Android: add local copy of abseil-cpp.
Checkout @ e19260fd7dbef881492fd73891e0be5bd4a09b95.
Change-Id: I19ee86beaa6323a2cf3727d9075052424868cdfa
diff --git a/third_party/.gitignore b/third_party/.gitignore
index 3ea3527..57f0164 100644
--- a/third_party/.gitignore
+++ b/third_party/.gitignore
@@ -1,3 +1,2 @@
-*/src/
llvm-build
modp_b64
diff --git a/third_party/abseil/README.android b/third_party/abseil/README.android
new file mode 100644
index 0000000..29fa864
--- /dev/null
+++ b/third_party/abseil/README.android
@@ -0,0 +1,11 @@
+Android requires all libraries using abseil to have the source code local to the library's code. The
+SHA hash below is the abseil-cpp hash that is in openscreen's DEPS file. The code is copied locally
+in openscreen/third-party/abseil/src.
+
+e19260fd7dbef881492fd73891e0be5bd4a09b95
+
+How to update abseil local copy:
+
+> git clone https://github.com/abseil/abseil-cpp.git src && cd src
+> git checkout <hash>
+> rm -rf .git .gitignore .github
diff --git a/third_party/abseil/src/.clang-format b/third_party/abseil/src/.clang-format
new file mode 100644
index 0000000..06ea346
--- /dev/null
+++ b/third_party/abseil/src/.clang-format
@@ -0,0 +1,4 @@
+---
+Language: Cpp
+BasedOnStyle: Google
+...
diff --git a/third_party/abseil/src/ABSEIL_ISSUE_TEMPLATE.md b/third_party/abseil/src/ABSEIL_ISSUE_TEMPLATE.md
new file mode 100644
index 0000000..ed5461f
--- /dev/null
+++ b/third_party/abseil/src/ABSEIL_ISSUE_TEMPLATE.md
@@ -0,0 +1,22 @@
+Please submit a new Abseil Issue using the template below:
+
+## [Short title of proposed API change(s)]
+
+--------------------------------------------------------------------------------
+--------------------------------------------------------------------------------
+
+## Background
+
+[Provide the background information that is required in order to evaluate the
+proposed API changes. No controversial claims should be made here. If there are
+design constraints that need to be considered, they should be presented here
+**along with justification for those constraints**. Linking to other docs is
+good, but please keep the **pertinent information as self contained** as
+possible in this section.]
+
+## Proposed API Change (s)
+
+[Please clearly describe the API change(s) being proposed. If multiple changes,
+please keep them clearly distinguished. When possible, **use example code
+snippets to illustrate before-after API usages**. List pros-n-cons. Highlight
+the main questions that you want to be answered. Given the Abseil project compatibility requirements, describe why the API change is safe.]
diff --git a/third_party/abseil/src/AUTHORS b/third_party/abseil/src/AUTHORS
new file mode 100644
index 0000000..976d31d
--- /dev/null
+++ b/third_party/abseil/src/AUTHORS
@@ -0,0 +1,6 @@
+# This is the list of Abseil authors for copyright purposes.
+#
+# This does not necessarily list everyone who has contributed code, since in
+# some cases, their employer may be the copyright holder. To see the full list
+# of contributors, see the revision history in source control.
+Google Inc.
diff --git a/third_party/abseil/src/BUILD.bazel b/third_party/abseil/src/BUILD.bazel
new file mode 100644
index 0000000..79fb0ec
--- /dev/null
+++ b/third_party/abseil/src/BUILD.bazel
@@ -0,0 +1,25 @@
+#
+# Copyright 2020 The Abseil Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+package(default_visibility = ["//visibility:public"])
+
+licenses(["notice"]) # Apache 2.0
+
+# Expose license for external usage through bazel.
+exports_files([
+ "AUTHORS",
+ "LICENSE",
+])
diff --git a/third_party/abseil/src/CMake/AbseilDll.cmake b/third_party/abseil/src/CMake/AbseilDll.cmake
new file mode 100644
index 0000000..e0ff249
--- /dev/null
+++ b/third_party/abseil/src/CMake/AbseilDll.cmake
@@ -0,0 +1,514 @@
+include(CMakeParseArguments)
+
+set(ABSL_INTERNAL_DLL_FILES
+ "algorithm/algorithm.h"
+ "algorithm/container.h"
+ "base/attributes.h"
+ "base/call_once.h"
+ "base/casts.h"
+ "base/config.h"
+ "base/const_init.h"
+ "base/dynamic_annotations.h"
+ "base/internal/atomic_hook.h"
+ "base/internal/bits.h"
+ "base/internal/cycleclock.cc"
+ "base/internal/cycleclock.h"
+ "base/internal/direct_mmap.h"
+ "base/internal/dynamic_annotations.h"
+ "base/internal/endian.h"
+ "base/internal/errno_saver.h"
+ "base/internal/exponential_biased.cc"
+ "base/internal/exponential_biased.h"
+ "base/internal/fast_type_id.h"
+ "base/internal/hide_ptr.h"
+ "base/internal/identity.h"
+ "base/internal/invoke.h"
+ "base/internal/inline_variable.h"
+ "base/internal/low_level_alloc.cc"
+ "base/internal/low_level_alloc.h"
+ "base/internal/low_level_scheduling.h"
+ "base/internal/per_thread_tls.h"
+ "base/internal/periodic_sampler.cc"
+ "base/internal/periodic_sampler.h"
+ "base/internal/pretty_function.h"
+ "base/internal/raw_logging.cc"
+ "base/internal/raw_logging.h"
+ "base/internal/scheduling_mode.h"
+ "base/internal/scoped_set_env.cc"
+ "base/internal/scoped_set_env.h"
+ "base/internal/strerror.h"
+ "base/internal/strerror.cc"
+ "base/internal/spinlock.cc"
+ "base/internal/spinlock.h"
+ "base/internal/spinlock_wait.cc"
+ "base/internal/spinlock_wait.h"
+ "base/internal/sysinfo.cc"
+ "base/internal/sysinfo.h"
+ "base/internal/thread_annotations.h"
+ "base/internal/thread_identity.cc"
+ "base/internal/thread_identity.h"
+ "base/internal/throw_delegate.cc"
+ "base/internal/throw_delegate.h"
+ "base/internal/tsan_mutex_interface.h"
+ "base/internal/unaligned_access.h"
+ "base/internal/unscaledcycleclock.cc"
+ "base/internal/unscaledcycleclock.h"
+ "base/log_severity.cc"
+ "base/log_severity.h"
+ "base/macros.h"
+ "base/optimization.h"
+ "base/options.h"
+ "base/policy_checks.h"
+ "base/port.h"
+ "base/thread_annotations.h"
+ "container/btree_map.h"
+ "container/btree_set.h"
+ "container/fixed_array.h"
+ "container/flat_hash_map.h"
+ "container/flat_hash_set.h"
+ "container/inlined_vector.h"
+ "container/internal/btree.h"
+ "container/internal/btree_container.h"
+ "container/internal/common.h"
+ "container/internal/compressed_tuple.h"
+ "container/internal/container_memory.h"
+ "container/internal/counting_allocator.h"
+ "container/internal/hash_function_defaults.h"
+ "container/internal/hash_policy_traits.h"
+ "container/internal/hashtable_debug.h"
+ "container/internal/hashtable_debug_hooks.h"
+ "container/internal/hashtablez_sampler.cc"
+ "container/internal/hashtablez_sampler.h"
+ "container/internal/hashtablez_sampler_force_weak_definition.cc"
+ "container/internal/have_sse.h"
+ "container/internal/inlined_vector.h"
+ "container/internal/layout.h"
+ "container/internal/node_hash_policy.h"
+ "container/internal/raw_hash_map.h"
+ "container/internal/raw_hash_set.cc"
+ "container/internal/raw_hash_set.h"
+ "container/internal/tracked.h"
+ "container/node_hash_map.h"
+ "container/node_hash_set.h"
+ "debugging/failure_signal_handler.cc"
+ "debugging/failure_signal_handler.h"
+ "debugging/leak_check.h"
+ "debugging/leak_check_disable.cc"
+ "debugging/stacktrace.cc"
+ "debugging/stacktrace.h"
+ "debugging/symbolize.cc"
+ "debugging/symbolize.h"
+ "debugging/internal/address_is_readable.cc"
+ "debugging/internal/address_is_readable.h"
+ "debugging/internal/demangle.cc"
+ "debugging/internal/demangle.h"
+ "debugging/internal/elf_mem_image.cc"
+ "debugging/internal/elf_mem_image.h"
+ "debugging/internal/examine_stack.cc"
+ "debugging/internal/examine_stack.h"
+ "debugging/internal/stack_consumption.cc"
+ "debugging/internal/stack_consumption.h"
+ "debugging/internal/stacktrace_config.h"
+ "debugging/internal/symbolize.h"
+ "debugging/internal/vdso_support.cc"
+ "debugging/internal/vdso_support.h"
+ "functional/internal/front_binder.h"
+ "functional/bind_front.h"
+ "functional/function_ref.h"
+ "functional/internal/function_ref.h"
+ "hash/hash.h"
+ "hash/internal/city.h"
+ "hash/internal/city.cc"
+ "hash/internal/hash.h"
+ "hash/internal/hash.cc"
+ "hash/internal/spy_hash_state.h"
+ "memory/memory.h"
+ "meta/type_traits.h"
+ "numeric/int128.cc"
+ "numeric/int128.h"
+ "random/bernoulli_distribution.h"
+ "random/beta_distribution.h"
+ "random/bit_gen_ref.h"
+ "random/discrete_distribution.cc"
+ "random/discrete_distribution.h"
+ "random/distributions.h"
+ "random/exponential_distribution.h"
+ "random/gaussian_distribution.cc"
+ "random/gaussian_distribution.h"
+ "random/internal/distribution_caller.h"
+ "random/internal/fastmath.h"
+ "random/internal/fast_uniform_bits.h"
+ "random/internal/generate_real.h"
+ "random/internal/iostream_state_saver.h"
+ "random/internal/mock_helpers.h"
+ "random/internal/nonsecure_base.h"
+ "random/internal/pcg_engine.h"
+ "random/internal/platform.h"
+ "random/internal/pool_urbg.cc"
+ "random/internal/pool_urbg.h"
+ "random/internal/randen.cc"
+ "random/internal/randen.h"
+ "random/internal/randen_detect.cc"
+ "random/internal/randen_detect.h"
+ "random/internal/randen_engine.h"
+ "random/internal/randen_hwaes.cc"
+ "random/internal/randen_hwaes.h"
+ "random/internal/randen_round_keys.cc"
+ "random/internal/randen_slow.cc"
+ "random/internal/randen_slow.h"
+ "random/internal/randen_traits.h"
+ "random/internal/salted_seed_seq.h"
+ "random/internal/seed_material.cc"
+ "random/internal/seed_material.h"
+ "random/internal/sequence_urbg.h"
+ "random/internal/traits.h"
+ "random/internal/uniform_helper.h"
+ "random/internal/wide_multiply.h"
+ "random/log_uniform_int_distribution.h"
+ "random/poisson_distribution.h"
+ "random/random.h"
+ "random/seed_gen_exception.cc"
+ "random/seed_gen_exception.h"
+ "random/seed_sequences.cc"
+ "random/seed_sequences.h"
+ "random/uniform_int_distribution.h"
+ "random/uniform_real_distribution.h"
+ "random/zipf_distribution.h"
+ "status/internal/status_internal.h"
+ "status/internal/statusor_internal.h"
+ "status/status.h"
+ "status/status.cc"
+ "status/statusor.h"
+ "status/statusor.cc"
+ "status/status_payload_printer.h"
+ "status/status_payload_printer.cc"
+ "strings/ascii.cc"
+ "strings/ascii.h"
+ "strings/charconv.cc"
+ "strings/charconv.h"
+ "strings/cord.cc"
+ "strings/cord.h"
+ "strings/escaping.cc"
+ "strings/escaping.h"
+ "strings/internal/cord_internal.h"
+ "strings/internal/charconv_bigint.cc"
+ "strings/internal/charconv_bigint.h"
+ "strings/internal/charconv_parse.cc"
+ "strings/internal/charconv_parse.h"
+ "strings/internal/stl_type_traits.h"
+ "strings/internal/string_constant.h"
+ "strings/match.cc"
+ "strings/match.h"
+ "strings/numbers.cc"
+ "strings/numbers.h"
+ "strings/str_format.h"
+ "strings/str_cat.cc"
+ "strings/str_cat.h"
+ "strings/str_join.h"
+ "strings/str_replace.cc"
+ "strings/str_replace.h"
+ "strings/str_split.cc"
+ "strings/str_split.h"
+ "strings/string_view.cc"
+ "strings/string_view.h"
+ "strings/strip.h"
+ "strings/substitute.cc"
+ "strings/substitute.h"
+ "strings/internal/char_map.h"
+ "strings/internal/escaping.h"
+ "strings/internal/escaping.cc"
+ "strings/internal/memutil.cc"
+ "strings/internal/memutil.h"
+ "strings/internal/ostringstream.cc"
+ "strings/internal/ostringstream.h"
+ "strings/internal/pow10_helper.cc"
+ "strings/internal/pow10_helper.h"
+ "strings/internal/resize_uninitialized.h"
+ "strings/internal/str_format/arg.cc"
+ "strings/internal/str_format/arg.h"
+ "strings/internal/str_format/bind.cc"
+ "strings/internal/str_format/bind.h"
+ "strings/internal/str_format/checker.h"
+ "strings/internal/str_format/extension.cc"
+ "strings/internal/str_format/extension.h"
+ "strings/internal/str_format/float_conversion.cc"
+ "strings/internal/str_format/float_conversion.h"
+ "strings/internal/str_format/output.cc"
+ "strings/internal/str_format/output.h"
+ "strings/internal/str_format/parser.cc"
+ "strings/internal/str_format/parser.h"
+ "strings/internal/str_join_internal.h"
+ "strings/internal/str_split_internal.h"
+ "strings/internal/utf8.cc"
+ "strings/internal/utf8.h"
+ "synchronization/barrier.cc"
+ "synchronization/barrier.h"
+ "synchronization/blocking_counter.cc"
+ "synchronization/blocking_counter.h"
+ "synchronization/mutex.cc"
+ "synchronization/mutex.h"
+ "synchronization/notification.cc"
+ "synchronization/notification.h"
+ "synchronization/internal/create_thread_identity.cc"
+ "synchronization/internal/create_thread_identity.h"
+ "synchronization/internal/futex.h"
+ "synchronization/internal/graphcycles.cc"
+ "synchronization/internal/graphcycles.h"
+ "synchronization/internal/kernel_timeout.h"
+ "synchronization/internal/per_thread_sem.cc"
+ "synchronization/internal/per_thread_sem.h"
+ "synchronization/internal/thread_pool.h"
+ "synchronization/internal/waiter.cc"
+ "synchronization/internal/waiter.h"
+ "time/civil_time.cc"
+ "time/civil_time.h"
+ "time/clock.cc"
+ "time/clock.h"
+ "time/duration.cc"
+ "time/format.cc"
+ "time/time.cc"
+ "time/time.h"
+ "time/internal/cctz/include/cctz/civil_time.h"
+ "time/internal/cctz/include/cctz/civil_time_detail.h"
+ "time/internal/cctz/include/cctz/time_zone.h"
+ "time/internal/cctz/include/cctz/zone_info_source.h"
+ "time/internal/cctz/src/civil_time_detail.cc"
+ "time/internal/cctz/src/time_zone_fixed.cc"
+ "time/internal/cctz/src/time_zone_fixed.h"
+ "time/internal/cctz/src/time_zone_format.cc"
+ "time/internal/cctz/src/time_zone_if.cc"
+ "time/internal/cctz/src/time_zone_if.h"
+ "time/internal/cctz/src/time_zone_impl.cc"
+ "time/internal/cctz/src/time_zone_impl.h"
+ "time/internal/cctz/src/time_zone_info.cc"
+ "time/internal/cctz/src/time_zone_info.h"
+ "time/internal/cctz/src/time_zone_libc.cc"
+ "time/internal/cctz/src/time_zone_libc.h"
+ "time/internal/cctz/src/time_zone_lookup.cc"
+ "time/internal/cctz/src/time_zone_posix.cc"
+ "time/internal/cctz/src/time_zone_posix.h"
+ "time/internal/cctz/src/tzfile.h"
+ "time/internal/cctz/src/zone_info_source.cc"
+ "types/any.h"
+ "types/bad_any_cast.cc"
+ "types/bad_any_cast.h"
+ "types/bad_optional_access.cc"
+ "types/bad_optional_access.h"
+ "types/bad_variant_access.cc"
+ "types/bad_variant_access.h"
+ "types/compare.h"
+ "types/internal/conformance_aliases.h"
+ "types/internal/conformance_archetype.h"
+ "types/internal/conformance_profile.h"
+ "types/internal/parentheses.h"
+ "types/internal/transform_args.h"
+ "types/internal/variant.h"
+ "types/optional.h"
+ "types/internal/optional.h"
+ "types/span.h"
+ "types/internal/span.h"
+ "types/variant.h"
+ "utility/utility.h"
+)
+
+set(ABSL_INTERNAL_DLL_TARGETS
+ "stacktrace"
+ "symbolize"
+ "examine_stack"
+ "failure_signal_handler"
+ "debugging_internal"
+ "demangle_internal"
+ "leak_check"
+ "leak_check_disable"
+ "stack_consumption"
+ "debugging"
+ "hash"
+ "spy_hash_state"
+ "city"
+ "memory"
+ "strings"
+ "strings_internal"
+ "cord"
+ "str_format"
+ "str_format_internal"
+ "pow10_helper"
+ "int128"
+ "numeric"
+ "utility"
+ "any"
+ "bad_any_cast"
+ "bad_any_cast_impl"
+ "span"
+ "optional"
+ "bad_optional_access"
+ "bad_variant_access"
+ "variant"
+ "compare"
+ "algorithm"
+ "algorithm_container"
+ "graphcycles_internal"
+ "kernel_timeout_internal"
+ "synchronization"
+ "thread_pool"
+ "bind_front"
+ "function_ref"
+ "atomic_hook"
+ "log_severity"
+ "raw_logging_internal"
+ "spinlock_wait"
+ "config"
+ "dynamic_annotations"
+ "core_headers"
+ "malloc_internal"
+ "base_internal"
+ "base"
+ "throw_delegate"
+ "pretty_function"
+ "endian"
+ "bits"
+ "exponential_biased"
+ "periodic_sampler"
+ "scoped_set_env"
+ "type_traits"
+ "meta"
+ "random_random"
+ "random_bit_gen_ref"
+ "random_distributions"
+ "random_seed_gen_exception"
+ "random_seed_sequences"
+ "random_internal_traits"
+ "random_internal_distribution_caller"
+ "random_internal_distributions"
+ "random_internal_fast_uniform_bits"
+ "random_internal_seed_material"
+ "random_internal_pool_urbg"
+ "random_internal_explicit_seed_seq"
+ "random_internal_sequence_urbg"
+ "random_internal_salted_seed_seq"
+ "random_internal_iostream_state_saver"
+ "random_internal_generate_real"
+ "random_internal_wide_multiply"
+ "random_internal_fastmath"
+ "random_internal_nonsecure_base"
+ "random_internal_pcg_engine"
+ "random_internal_randen_engine"
+ "random_internal_platform"
+ "random_internal_randen"
+ "random_internal_randen_slow"
+ "random_internal_randen_hwaes"
+ "random_internal_randen_hwaes_impl"
+ "random_internal_uniform_helper"
+ "status"
+ "time"
+ "civil_time"
+ "time_zone"
+ "container"
+ "btree"
+ "compressed_tuple"
+ "fixed_array"
+ "inlined_vector_internal"
+ "inlined_vector"
+ "counting_allocator"
+ "flat_hash_map"
+ "flat_hash_set"
+ "node_hash_map"
+ "node_hash_set"
+ "container_memory"
+ "hash_function_defaults"
+ "hash_policy_traits"
+ "hashtablez_sampler"
+ "hashtable_debug"
+ "hashtable_debug_hooks"
+ "have_sse"
+ "node_hash_policy"
+ "raw_hash_map"
+ "container_common"
+ "raw_hash_set"
+ "layout"
+ "tracked"
+)
+
+function(absl_internal_dll_contains)
+ cmake_parse_arguments(ABSL_INTERNAL_DLL
+ ""
+ "OUTPUT;TARGET"
+ ""
+ ${ARGN}
+ )
+
+ STRING(REGEX REPLACE "^absl::" "" _target ${ABSL_INTERNAL_DLL_TARGET})
+
+ list(FIND
+ ABSL_INTERNAL_DLL_TARGETS
+ "${_target}"
+ _index)
+
+ if (${_index} GREATER -1)
+ set(${ABSL_INTERNAL_DLL_OUTPUT} 1 PARENT_SCOPE)
+ else()
+ set(${ABSL_INTERNAL_DLL_OUTPUT} 0 PARENT_SCOPE)
+ endif()
+endfunction()
+
+function(absl_internal_dll_targets)
+ cmake_parse_arguments(ABSL_INTERNAL_DLL
+ ""
+ "OUTPUT"
+ "DEPS"
+ ${ARGN}
+ )
+
+ set(_deps "")
+ foreach(dep IN LISTS ABSL_INTERNAL_DLL_DEPS)
+ absl_internal_dll_contains(TARGET ${dep} OUTPUT _contains)
+ if (_contains)
+ list(APPEND _deps abseil_dll)
+ else()
+ list(APPEND _deps ${dep})
+ endif()
+ endforeach()
+
+ # Because we may have added the DLL multiple times
+ list(REMOVE_DUPLICATES _deps)
+ set(${ABSL_INTERNAL_DLL_OUTPUT} "${_deps}" PARENT_SCOPE)
+endfunction()
+
+function(absl_make_dll)
+ add_library(
+ abseil_dll
+ SHARED
+ "${ABSL_INTERNAL_DLL_FILES}"
+ )
+ target_link_libraries(
+ abseil_dll
+ PRIVATE
+ ${ABSL_DEFAULT_LINKOPTS}
+ )
+ set_property(TARGET abseil_dll PROPERTY LINKER_LANGUAGE "CXX")
+ target_include_directories(
+ abseil_dll
+ PUBLIC
+ "$<BUILD_INTERFACE:${ABSL_COMMON_INCLUDE_DIRS}>"
+ $<INSTALL_INTERFACE:${ABSL_INSTALL_INCLUDEDIR}>
+ )
+
+ target_compile_options(
+ abseil_dll
+ PRIVATE
+ ${ABSL_DEFAULT_COPTS}
+ )
+
+ target_compile_definitions(
+ abseil_dll
+ PRIVATE
+ ABSL_BUILD_DLL
+ NOMINMAX
+ INTERFACE
+ ${ABSL_CC_LIB_DEFINES}
+ )
+ install(TARGETS abseil_dll EXPORT ${PROJECT_NAME}Targets
+ RUNTIME DESTINATION ${ABSL_INSTALL_BINDIR}
+ LIBRARY DESTINATION ${ABSL_INSTALL_LIBDIR}
+ ARCHIVE DESTINATION ${ABSL_INSTALL_LIBDIR}
+ )
+endfunction()
diff --git a/third_party/abseil/src/CMake/AbseilHelpers.cmake b/third_party/abseil/src/CMake/AbseilHelpers.cmake
new file mode 100644
index 0000000..e88507d
--- /dev/null
+++ b/third_party/abseil/src/CMake/AbseilHelpers.cmake
@@ -0,0 +1,402 @@
+#
+# Copyright 2017 The Abseil Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+include(CMakeParseArguments)
+include(AbseilConfigureCopts)
+include(AbseilDll)
+include(AbseilInstallDirs)
+
+# The IDE folder for Abseil that will be used if Abseil is included in a CMake
+# project that sets
+# set_property(GLOBAL PROPERTY USE_FOLDERS ON)
+# For example, Visual Studio supports folders.
+if(NOT DEFINED ABSL_IDE_FOLDER)
+ set(ABSL_IDE_FOLDER Abseil)
+endif()
+
+# absl_cc_library()
+#
+# CMake function to imitate Bazel's cc_library rule.
+#
+# Parameters:
+# NAME: name of target (see Note)
+# HDRS: List of public header files for the library
+# SRCS: List of source files for the library
+# DEPS: List of other libraries to be linked in to the binary targets
+# COPTS: List of private compile options
+# DEFINES: List of public defines
+# LINKOPTS: List of link options
+# PUBLIC: Add this so that this library will be exported under absl::
+# Also in IDE, target will appear in Abseil folder while non PUBLIC will be in Abseil/internal.
+# TESTONLY: When added, this target will only be built if user passes -DABSL_RUN_TESTS=ON to CMake.
+#
+# Note:
+# By default, absl_cc_library will always create a library named absl_${NAME},
+# and alias target absl::${NAME}. The absl:: form should always be used.
+# This is to reduce namespace pollution.
+#
+# absl_cc_library(
+# NAME
+# awesome
+# HDRS
+# "a.h"
+# SRCS
+# "a.cc"
+# )
+# absl_cc_library(
+# NAME
+# fantastic_lib
+# SRCS
+# "b.cc"
+# DEPS
+# absl::awesome # not "awesome" !
+# PUBLIC
+# )
+#
+# absl_cc_library(
+# NAME
+# main_lib
+# ...
+# DEPS
+# absl::fantastic_lib
+# )
+#
+# TODO: Implement "ALWAYSLINK"
+function(absl_cc_library)
+ cmake_parse_arguments(ABSL_CC_LIB
+ "DISABLE_INSTALL;PUBLIC;TESTONLY"
+ "NAME"
+ "HDRS;SRCS;COPTS;DEFINES;LINKOPTS;DEPS"
+ ${ARGN}
+ )
+
+ if(ABSL_CC_LIB_TESTONLY AND NOT ABSL_RUN_TESTS)
+ return()
+ endif()
+
+ if(ABSL_ENABLE_INSTALL)
+ set(_NAME "${ABSL_CC_LIB_NAME}")
+ else()
+ set(_NAME "absl_${ABSL_CC_LIB_NAME}")
+ endif()
+
+ # Check if this is a header-only library
+ # Note that as of February 2019, many popular OS's (for example, Ubuntu
+ # 16.04 LTS) only come with cmake 3.5 by default. For this reason, we can't
+ # use list(FILTER...)
+ set(ABSL_CC_SRCS "${ABSL_CC_LIB_SRCS}")
+ foreach(src_file IN LISTS ABSL_CC_SRCS)
+ if(${src_file} MATCHES ".*\\.(h|inc)")
+ list(REMOVE_ITEM ABSL_CC_SRCS "${src_file}")
+ endif()
+ endforeach()
+
+ if("${ABSL_CC_SRCS}" STREQUAL "")
+ set(ABSL_CC_LIB_IS_INTERFACE 1)
+ else()
+ set(ABSL_CC_LIB_IS_INTERFACE 0)
+ endif()
+
+ # Determine this build target's relationship to the DLL. It's one of four things:
+ # 1. "dll" -- This target is part of the DLL
+ # 2. "dll_dep" -- This target is not part of the DLL, but depends on the DLL.
+ # Note that we assume any target not in the DLL depends on the
+ # DLL. This is not a technical necessity but a convenience
+ # which happens to be true, because nearly every target is
+ # part of the DLL.
+ # 3. "shared" -- This is a shared library, perhaps on a non-windows platform
+ # where DLL doesn't make sense.
+ # 4. "static" -- This target does not depend on the DLL and should be built
+ # statically.
+ if (${ABSL_BUILD_DLL})
+ if(ABSL_ENABLE_INSTALL)
+ absl_internal_dll_contains(TARGET ${_NAME} OUTPUT _in_dll)
+ else()
+ absl_internal_dll_contains(TARGET ${ABSL_CC_LIB_NAME} OUTPUT _in_dll)
+ endif()
+ if (${_in_dll})
+ # This target should be replaced by the DLL
+ set(_build_type "dll")
+ set(ABSL_CC_LIB_IS_INTERFACE 1)
+ else()
+ # Building a DLL, but this target is not part of the DLL
+ set(_build_type "dll_dep")
+ endif()
+ elseif(BUILD_SHARED_LIBS)
+ set(_build_type "shared")
+ else()
+ set(_build_type "static")
+ endif()
+
+ # Generate a pkg-config file for every library:
+ if(${_build_type} STREQUAL "static" OR ${_build_type} STREQUAL "shared")
+ if(NOT ABSL_CC_LIB_TESTONLY)
+ if(absl_VERSION)
+ set(PC_VERSION "${absl_VERSION}")
+ else()
+ set(PC_VERSION "head")
+ endif()
+ foreach(dep ${ABSL_CC_LIB_DEPS})
+ if(${dep} MATCHES "^absl::(.*)")
+ set(PC_DEPS "${PC_DEPS} absl_${CMAKE_MATCH_1} = ${PC_VERSION}")
+ endif()
+ endforeach()
+ foreach(cflag ${ABSL_CC_LIB_COPTS})
+ if(${cflag} MATCHES "^(-Wno|/wd)")
+ # These flags are needed to suppress warnings that might fire in our headers.
+ set(PC_CFLAGS "${PC_CFLAGS} ${cflag}")
+ elseif(${cflag} MATCHES "^(-W|/w[1234eo])")
+ # Don't impose our warnings on others.
+ else()
+ set(PC_CFLAGS "${PC_CFLAGS} ${cflag}")
+ endif()
+ endforeach()
+ FILE(GENERATE OUTPUT "${CMAKE_BINARY_DIR}/lib/pkgconfig/absl_${_NAME}.pc" CONTENT "\
+prefix=${CMAKE_INSTALL_PREFIX}\n\
+exec_prefix=\${prefix}\n\
+libdir=\${prefix}/lib\n\
+includedir=\${prefix}/include\n\
+\n\
+Name: absl_${_NAME}\n\
+Description: Abseil ${_NAME} library\n\
+URL: https://abseil.io/\n\
+Version: ${PC_VERSION}\n\
+Requires.private:${PC_DEPS}\n\
+Libs: -L\${libdir} $<JOIN:${ABSL_CC_LIB_LINKOPTS}, > $<$<NOT:$<BOOL:${ABSL_CC_LIB_IS_INTERFACE}>>:-labsl_${_NAME}>\n\
+Cflags: -I\${includedir}${PC_CFLAGS}\n")
+ INSTALL(FILES "${CMAKE_BINARY_DIR}/lib/pkgconfig/absl_${_NAME}.pc"
+ DESTINATION "${CMAKE_INSTALL_PREFIX}/lib/pkgconfig")
+ endif()
+ endif()
+
+ if(NOT ABSL_CC_LIB_IS_INTERFACE)
+ if(${_build_type} STREQUAL "dll_dep")
+ # This target depends on the DLL. When adding dependencies to this target,
+ # any depended-on-target which is contained inside the DLL is replaced
+ # with a dependency on the DLL.
+ add_library(${_NAME} STATIC "")
+ target_sources(${_NAME} PRIVATE ${ABSL_CC_LIB_SRCS} ${ABSL_CC_LIB_HDRS})
+ absl_internal_dll_targets(
+ DEPS ${ABSL_CC_LIB_DEPS}
+ OUTPUT _dll_deps
+ )
+ target_link_libraries(${_NAME}
+ PUBLIC ${_dll_deps}
+ PRIVATE
+ ${ABSL_CC_LIB_LINKOPTS}
+ ${ABSL_DEFAULT_LINKOPTS}
+ )
+
+ if (ABSL_CC_LIB_TESTONLY)
+ set(_gtest_link_define "GTEST_LINKED_AS_SHARED_LIBRARY=1")
+ else()
+ set(_gtest_link_define)
+ endif()
+
+ target_compile_definitions(${_NAME}
+ PUBLIC
+ ABSL_CONSUME_DLL
+ "${_gtest_link_define}"
+ )
+
+ elseif(${_build_type} STREQUAL "static" OR ${_build_type} STREQUAL "shared")
+ add_library(${_NAME} "")
+ target_sources(${_NAME} PRIVATE ${ABSL_CC_LIB_SRCS} ${ABSL_CC_LIB_HDRS})
+ target_link_libraries(${_NAME}
+ PUBLIC ${ABSL_CC_LIB_DEPS}
+ PRIVATE
+ ${ABSL_CC_LIB_LINKOPTS}
+ ${ABSL_DEFAULT_LINKOPTS}
+ )
+ else()
+ message(FATAL_ERROR "Invalid build type: ${_build_type}")
+ endif()
+
+ # Linker language can be inferred from sources, but in the case of DLLs we
+ # don't have any .cc files so it would be ambiguous. We could set it
+ # explicitly only in the case of DLLs but, because "CXX" is always the
+ # correct linker language for static or for shared libraries, we set it
+ # unconditionally.
+ set_property(TARGET ${_NAME} PROPERTY LINKER_LANGUAGE "CXX")
+
+ target_include_directories(${_NAME}
+ PUBLIC
+ "$<BUILD_INTERFACE:${ABSL_COMMON_INCLUDE_DIRS}>"
+ $<INSTALL_INTERFACE:${ABSL_INSTALL_INCLUDEDIR}>
+ )
+ target_compile_options(${_NAME}
+ PRIVATE ${ABSL_CC_LIB_COPTS})
+ target_compile_definitions(${_NAME} PUBLIC ${ABSL_CC_LIB_DEFINES})
+
+ # Add all Abseil targets to a a folder in the IDE for organization.
+ if(ABSL_CC_LIB_PUBLIC)
+ set_property(TARGET ${_NAME} PROPERTY FOLDER ${ABSL_IDE_FOLDER})
+ elseif(ABSL_CC_LIB_TESTONLY)
+ set_property(TARGET ${_NAME} PROPERTY FOLDER ${ABSL_IDE_FOLDER}/test)
+ else()
+ set_property(TARGET ${_NAME} PROPERTY FOLDER ${ABSL_IDE_FOLDER}/internal)
+ endif()
+
+ # INTERFACE libraries can't have the CXX_STANDARD property set
+ set_property(TARGET ${_NAME} PROPERTY CXX_STANDARD ${ABSL_CXX_STANDARD})
+ set_property(TARGET ${_NAME} PROPERTY CXX_STANDARD_REQUIRED ON)
+
+ # When being installed, we lose the absl_ prefix. We want to put it back
+ # to have properly named lib files. This is a no-op when we are not being
+ # installed.
+ if(ABSL_ENABLE_INSTALL)
+ set_target_properties(${_NAME} PROPERTIES
+ OUTPUT_NAME "absl_${_NAME}"
+ # TODO(b/173696973): Figure out how to set SOVERSION for LTS releases.
+ SOVERSION 0
+ )
+ endif()
+ else()
+ # Generating header-only library
+ add_library(${_NAME} INTERFACE)
+ target_include_directories(${_NAME}
+ INTERFACE
+ "$<BUILD_INTERFACE:${ABSL_COMMON_INCLUDE_DIRS}>"
+ $<INSTALL_INTERFACE:${ABSL_INSTALL_INCLUDEDIR}>
+ )
+
+ if (${_build_type} STREQUAL "dll")
+ set(ABSL_CC_LIB_DEPS abseil_dll)
+ endif()
+
+ target_link_libraries(${_NAME}
+ INTERFACE
+ ${ABSL_CC_LIB_DEPS}
+ ${ABSL_CC_LIB_LINKOPTS}
+ ${ABSL_DEFAULT_LINKOPTS}
+ )
+ target_compile_definitions(${_NAME} INTERFACE ${ABSL_CC_LIB_DEFINES})
+ endif()
+
+ # TODO currently we don't install googletest alongside abseil sources, so
+ # installed abseil can't be tested.
+ if(NOT ABSL_CC_LIB_TESTONLY AND ABSL_ENABLE_INSTALL)
+ install(TARGETS ${_NAME} EXPORT ${PROJECT_NAME}Targets
+ RUNTIME DESTINATION ${ABSL_INSTALL_BINDIR}
+ LIBRARY DESTINATION ${ABSL_INSTALL_LIBDIR}
+ ARCHIVE DESTINATION ${ABSL_INSTALL_LIBDIR}
+ )
+ endif()
+
+ add_library(absl::${ABSL_CC_LIB_NAME} ALIAS ${_NAME})
+endfunction()
+
+# absl_cc_test()
+#
+# CMake function to imitate Bazel's cc_test rule.
+#
+# Parameters:
+# NAME: name of target (see Usage below)
+# SRCS: List of source files for the binary
+# DEPS: List of other libraries to be linked in to the binary targets
+# COPTS: List of private compile options
+# DEFINES: List of public defines
+# LINKOPTS: List of link options
+#
+# Note:
+# By default, absl_cc_test will always create a binary named absl_${NAME}.
+# This will also add it to ctest list as absl_${NAME}.
+#
+# Usage:
+# absl_cc_library(
+# NAME
+# awesome
+# HDRS
+# "a.h"
+# SRCS
+# "a.cc"
+# PUBLIC
+# )
+#
+# absl_cc_test(
+# NAME
+# awesome_test
+# SRCS
+# "awesome_test.cc"
+# DEPS
+# absl::awesome
+# gmock
+# gtest_main
+# )
+function(absl_cc_test)
+ if(NOT ABSL_RUN_TESTS)
+ return()
+ endif()
+
+ cmake_parse_arguments(ABSL_CC_TEST
+ ""
+ "NAME"
+ "SRCS;COPTS;DEFINES;LINKOPTS;DEPS"
+ ${ARGN}
+ )
+
+ set(_NAME "absl_${ABSL_CC_TEST_NAME}")
+
+ add_executable(${_NAME} "")
+ target_sources(${_NAME} PRIVATE ${ABSL_CC_TEST_SRCS})
+ target_include_directories(${_NAME}
+ PUBLIC ${ABSL_COMMON_INCLUDE_DIRS}
+ PRIVATE ${GMOCK_INCLUDE_DIRS} ${GTEST_INCLUDE_DIRS}
+ )
+
+ if (${ABSL_BUILD_DLL})
+ target_compile_definitions(${_NAME}
+ PUBLIC
+ ${ABSL_CC_TEST_DEFINES}
+ ABSL_CONSUME_DLL
+ GTEST_LINKED_AS_SHARED_LIBRARY=1
+ )
+
+ # Replace dependencies on targets inside the DLL with abseil_dll itself.
+ absl_internal_dll_targets(
+ DEPS ${ABSL_CC_TEST_DEPS}
+ OUTPUT ABSL_CC_TEST_DEPS
+ )
+ else()
+ target_compile_definitions(${_NAME}
+ PUBLIC
+ ${ABSL_CC_TEST_DEFINES}
+ )
+ endif()
+ target_compile_options(${_NAME}
+ PRIVATE ${ABSL_CC_TEST_COPTS}
+ )
+
+ target_link_libraries(${_NAME}
+ PUBLIC ${ABSL_CC_TEST_DEPS}
+ PRIVATE ${ABSL_CC_TEST_LINKOPTS}
+ )
+ # Add all Abseil targets to a folder in the IDE for organization.
+ set_property(TARGET ${_NAME} PROPERTY FOLDER ${ABSL_IDE_FOLDER}/test)
+
+ set_property(TARGET ${_NAME} PROPERTY CXX_STANDARD ${ABSL_CXX_STANDARD})
+ set_property(TARGET ${_NAME} PROPERTY CXX_STANDARD_REQUIRED ON)
+
+ add_test(NAME ${_NAME} COMMAND ${_NAME})
+endfunction()
+
+
+function(check_target my_target)
+ if(NOT TARGET ${my_target})
+ message(FATAL_ERROR " ABSL: compiling absl requires a ${my_target} CMake target in your project,
+ see CMake/README.md for more details")
+ endif(NOT TARGET ${my_target})
+endfunction()
diff --git a/third_party/abseil/src/CMake/AbseilInstallDirs.cmake b/third_party/abseil/src/CMake/AbseilInstallDirs.cmake
new file mode 100644
index 0000000..6fc914b
--- /dev/null
+++ b/third_party/abseil/src/CMake/AbseilInstallDirs.cmake
@@ -0,0 +1,20 @@
+include(GNUInstallDirs)
+
+# absl_VERSION is only set if we are an LTS release being installed, in which
+# case it may be into a system directory and so we need to make subdirectories
+# for each installed version of Abseil. This mechanism is implemented in
+# Abseil's internal Copybara (https://github.com/google/copybara) workflows and
+# isn't visible in the CMake buildsystem itself.
+
+if(absl_VERSION)
+ set(ABSL_SUBDIR "${PROJECT_NAME}_${PROJECT_VERSION}")
+ set(ABSL_INSTALL_BINDIR "${CMAKE_INSTALL_BINDIR}/${ABSL_SUBDIR}")
+ set(ABSL_INSTALL_CONFIGDIR "${CMAKE_INSTALL_LIBDIR}/cmake/${ABSL_SUBDIR}")
+ set(ABSL_INSTALL_INCLUDEDIR "${CMAKE_INSTALL_INCLUDEDIR}/${ABSL_SUBDIR}")
+ set(ABSL_INSTALL_LIBDIR "${CMAKE_INSTALL_LIBDIR}/${ABSL_SUBDIR}")
+else()
+ set(ABSL_INSTALL_BINDIR "${CMAKE_INSTALL_BINDIR}")
+ set(ABSL_INSTALL_CONFIGDIR "${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}")
+ set(ABSL_INSTALL_INCLUDEDIR "${CMAKE_INSTALL_INCLUDEDIR}")
+ set(ABSL_INSTALL_LIBDIR "${CMAKE_INSTALL_LIBDIR}")
+endif()
diff --git a/third_party/abseil/src/CMake/Googletest/CMakeLists.txt.in b/third_party/abseil/src/CMake/Googletest/CMakeLists.txt.in
new file mode 100644
index 0000000..5769e3a
--- /dev/null
+++ b/third_party/abseil/src/CMake/Googletest/CMakeLists.txt.in
@@ -0,0 +1,14 @@
+cmake_minimum_required(VERSION 2.8.2)
+
+project(googletest-external NONE)
+
+include(ExternalProject)
+ExternalProject_Add(googletest
+ URL "${absl_gtest_download_url}" # May be empty
+ SOURCE_DIR "${absl_gtest_src_dir}"
+ BINARY_DIR "${absl_gtest_build_dir}"
+ CONFIGURE_COMMAND ""
+ BUILD_COMMAND ""
+ INSTALL_COMMAND ""
+ TEST_COMMAND ""
+)
diff --git a/third_party/abseil/src/CMake/Googletest/DownloadGTest.cmake b/third_party/abseil/src/CMake/Googletest/DownloadGTest.cmake
new file mode 100644
index 0000000..9d071c9
--- /dev/null
+++ b/third_party/abseil/src/CMake/Googletest/DownloadGTest.cmake
@@ -0,0 +1,41 @@
+# Integrates googletest at configure time. Based on the instructions at
+# https://github.com/google/googletest/tree/master/googletest#incorporating-into-an-existing-cmake-project
+
+# Set up the external googletest project, downloading the latest from Github
+# master if requested.
+configure_file(
+ ${CMAKE_CURRENT_LIST_DIR}/CMakeLists.txt.in
+ ${CMAKE_BINARY_DIR}/googletest-external/CMakeLists.txt
+)
+
+set(ABSL_SAVE_CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS})
+set(ABSL_SAVE_CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_RUNTIME_OUTPUT_DIRECTORY})
+if (BUILD_SHARED_LIBS)
+ set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
+ set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DGTEST_CREATE_SHARED_LIBRARY=1")
+endif()
+
+# Configure and build the googletest source.
+execute_process(COMMAND ${CMAKE_COMMAND} -G "${CMAKE_GENERATOR}" .
+ RESULT_VARIABLE result
+ WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/googletest-external )
+if(result)
+ message(FATAL_ERROR "CMake step for googletest failed: ${result}")
+endif()
+
+execute_process(COMMAND ${CMAKE_COMMAND} --build .
+ RESULT_VARIABLE result
+ WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/googletest-external)
+if(result)
+ message(FATAL_ERROR "Build step for googletest failed: ${result}")
+endif()
+
+set(CMAKE_CXX_FLAGS ${ABSL_SAVE_CMAKE_CXX_FLAGS})
+set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${ABSL_SAVE_CMAKE_RUNTIME_OUTPUT_DIRECTORY})
+
+# Prevent overriding the parent project's compiler/linker settings on Windows
+set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)
+
+# Add googletest directly to our build. This defines the gtest and gtest_main
+# targets.
+add_subdirectory(${absl_gtest_src_dir} ${absl_gtest_build_dir} EXCLUDE_FROM_ALL)
diff --git a/third_party/abseil/src/CMake/README.md b/third_party/abseil/src/CMake/README.md
new file mode 100644
index 0000000..8f73475
--- /dev/null
+++ b/third_party/abseil/src/CMake/README.md
@@ -0,0 +1,101 @@
+# Abseil CMake Build Instructions
+
+Abseil comes with a CMake build script ([CMakeLists.txt](../CMakeLists.txt))
+that can be used on a wide range of platforms ("C" stands for cross-platform.).
+If you don't have CMake installed already, you can download it for free from
+<https://www.cmake.org/>.
+
+CMake works by generating native makefiles or build projects that can
+be used in the compiler environment of your choice.
+
+For API/ABI compatibility reasons, we strongly recommend building Abseil in a
+subdirectory of your project or as an embedded dependency.
+
+## Incorporating Abseil Into a CMake Project
+
+The recommendations below are similar to those for using CMake within the
+googletest framework
+(<https://github.com/google/googletest/blob/master/googletest/README.md#incorporating-into-an-existing-cmake-project>)
+
+### Step-by-Step Instructions
+
+1. If you want to build the Abseil tests, integrate the Abseil dependency
+[Google Test](https://github.com/google/googletest) into your CMake project. To disable Abseil tests, you have to pass
+`-DBUILD_TESTING=OFF` when configuring your project with CMake.
+
+2. Download Abseil and copy it into a subdirectory in your CMake project or add
+Abseil as a [git submodule](https://git-scm.com/docs/git-submodule) in your
+CMake project.
+
+3. You can then use the CMake command
+[`add_subdirectory()`](https://cmake.org/cmake/help/latest/command/add_subdirectory.html)
+to include Abseil directly in your CMake project.
+
+4. Add the **absl::** target you wish to use to the
+[`target_link_libraries()`](https://cmake.org/cmake/help/latest/command/target_link_libraries.html)
+section of your executable or of your library.<br>
+Here is a short CMakeLists.txt example of a project file using Abseil.
+
+```cmake
+cmake_minimum_required(VERSION 3.5)
+project(my_project)
+
+# Pick the C++ standard to compile with.
+# Abseil currently supports C++11, C++14, and C++17.
+set(CMAKE_CXX_STANDARD 11)
+
+add_subdirectory(abseil-cpp)
+
+add_executable(my_exe source.cpp)
+target_link_libraries(my_exe absl::base absl::synchronization absl::strings)
+```
+
+### Running Abseil Tests with CMake
+
+Use the `-DABSL_RUN_TESTS=ON` flag to run Abseil tests. Note that if the `-DBUILD_TESTING=OFF` flag is passed then Abseil tests will not be run.
+
+You will need to provide Abseil with a Googletest dependency. There are two
+options for how to do this:
+
+* Use `-DABSL_USE_GOOGLETEST_HEAD`. This will automatically download the latest
+Googletest source into the build directory at configure time. Googletest will
+then be compiled directly alongside Abseil's tests.
+* Manually integrate Googletest with your build. See
+https://github.com/google/googletest/blob/master/googletest/README.md#using-cmake
+for more information on using Googletest in a CMake project.
+
+For example, to run just the Abseil tests, you could use this script:
+
+```
+cd path/to/abseil-cpp
+mkdir build
+cd build
+cmake -DABSL_USE_GOOGLETEST_HEAD=ON -DABSL_RUN_TESTS=ON ..
+make -j
+ctest
+```
+
+Currently, we only run our tests with CMake in a Linux environment, but we are
+working on the rest of our supported platforms. See
+https://github.com/abseil/abseil-cpp/projects/1 and
+https://github.com/abseil/abseil-cpp/issues/109 for more information.
+
+### Available Abseil CMake Public Targets
+
+Here's a non-exhaustive list of Abseil CMake public targets:
+
+```cmake
+absl::algorithm
+absl::base
+absl::debugging
+absl::flat_hash_map
+absl::flags
+absl::memory
+absl::meta
+absl::numeric
+absl::random_random
+absl::strings
+absl::synchronization
+absl::time
+absl::utility
+```
diff --git a/third_party/abseil/src/CMake/abslConfig.cmake.in b/third_party/abseil/src/CMake/abslConfig.cmake.in
new file mode 100644
index 0000000..62d246d
--- /dev/null
+++ b/third_party/abseil/src/CMake/abslConfig.cmake.in
@@ -0,0 +1,8 @@
+# absl CMake configuration file.
+
+include(CMakeFindDependencyMacro)
+find_dependency(Threads)
+
+@PACKAGE_INIT@
+
+include ("${CMAKE_CURRENT_LIST_DIR}/@PROJECT_NAME@Targets.cmake")
diff --git a/third_party/abseil/src/CMake/install_test_project/CMakeLists.txt b/third_party/abseil/src/CMake/install_test_project/CMakeLists.txt
new file mode 100644
index 0000000..06b797e
--- /dev/null
+++ b/third_party/abseil/src/CMake/install_test_project/CMakeLists.txt
@@ -0,0 +1,27 @@
+#
+# Copyright 2019 The Abseil Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# A simple CMakeLists.txt for testing cmake installation
+
+cmake_minimum_required(VERSION 3.5)
+project(absl_cmake_testing CXX)
+
+set(CMAKE_CXX_STANDARD 11)
+
+add_executable(simple simple.cc)
+
+find_package(absl REQUIRED)
+
+target_link_libraries(simple absl::strings)
diff --git a/third_party/abseil/src/CMake/install_test_project/simple.cc b/third_party/abseil/src/CMake/install_test_project/simple.cc
new file mode 100644
index 0000000..e9e3529
--- /dev/null
+++ b/third_party/abseil/src/CMake/install_test_project/simple.cc
@@ -0,0 +1,23 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <iostream>
+#include "absl/strings/substitute.h"
+
+int main(int argc, char** argv) {
+ for (int i = 0; i < argc; ++i) {
+ std::cout << absl::Substitute("Arg $0: $1\n", i, argv[i]);
+ }
+}
diff --git a/third_party/abseil/src/CMake/install_test_project/test.sh b/third_party/abseil/src/CMake/install_test_project/test.sh
new file mode 100755
index 0000000..ddc7726
--- /dev/null
+++ b/third_party/abseil/src/CMake/install_test_project/test.sh
@@ -0,0 +1,162 @@
+#!/bin/bash
+#
+# Copyright 2019 The Abseil Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# "Unit" and integration tests for Absl CMake installation
+
+# TODO(absl-team): This script isn't fully hermetic because
+# -DABSL_USE_GOOGLETEST_HEAD=ON means that this script isn't pinned to a fixed
+# version of GoogleTest. This means that an upstream change to GoogleTest could
+# break this test. Fix this by allowing this script to pin to a known-good
+# version of GoogleTest.
+
+# Fail on any error. Treat unset variables an error. Print commands as executed.
+set -euox pipefail
+
+install_absl() {
+ pushd "${absl_build_dir}"
+ if [[ "${#}" -eq 1 ]]; then
+ cmake -DCMAKE_INSTALL_PREFIX="${1}" "${absl_dir}"
+ else
+ cmake "${absl_dir}"
+ fi
+ cmake --build . --target install -- -j
+ popd
+}
+
+uninstall_absl() {
+ xargs rm < "${absl_build_dir}"/install_manifest.txt
+ rm -rf "${absl_build_dir}"
+ mkdir -p "${absl_build_dir}"
+}
+
+lts_install=""
+
+while getopts ":l" lts; do
+ case "${lts}" in
+ l )
+ lts_install="true"
+ ;;
+ esac
+done
+
+absl_dir=/abseil-cpp
+absl_build_dir=/buildfs/absl-build
+project_dir="${absl_dir}"/CMake/install_test_project
+project_build_dir=/buildfs/project-build
+
+mkdir -p "${absl_build_dir}"
+mkdir -p "${project_build_dir}"
+
+if [[ "${lts_install}" ]]; then
+ install_dir="/usr/local"
+else
+ install_dir="${project_build_dir}"/install
+fi
+mkdir -p "${install_dir}"
+
+# Test build, install, and link against installed abseil
+pushd "${project_build_dir}"
+if [[ "${lts_install}" ]]; then
+ install_absl
+ cmake "${project_dir}"
+else
+ install_absl "${install_dir}"
+ cmake "${project_dir}" -DCMAKE_PREFIX_PATH="${install_dir}"
+fi
+
+cmake --build . --target simple
+
+output="$(${project_build_dir}/simple "printme" 2>&1)"
+if [[ "${output}" != *"Arg 1: printme"* ]]; then
+ echo "Faulty output on simple project:"
+ echo "${output}"
+ exit 1
+fi
+
+popd
+
+# Test that we haven't accidentally made absl::abslblah
+pushd "${install_dir}"
+
+# Starting in CMake 3.12 the default install dir is lib$bit_width
+if [[ -d lib64 ]]; then
+ libdir="lib64"
+elif [[ -d lib ]]; then
+ libdir="lib"
+else
+ echo "ls *, */*, */*/*:"
+ ls *
+ ls */*
+ ls */*/*
+ echo "unknown lib dir"
+fi
+
+if [[ "${lts_install}" ]]; then
+ # LTS versions append the date of the release to the subdir.
+ # 9999/99/99 is the dummy date used in the local_lts workflow.
+ absl_subdir="absl_99999999"
+else
+ absl_subdir="absl"
+fi
+
+if ! grep absl::strings "${libdir}/cmake/${absl_subdir}/abslTargets.cmake"; then
+ cat "${libdir}"/cmake/absl/abslTargets.cmake
+ echo "CMake targets named incorrectly"
+ exit 1
+fi
+
+pushd "${HOME}"
+cat > hello-abseil.cc << EOF
+#include <cstdlib>
+
+#include "absl/strings/str_format.h"
+
+int main(int argc, char **argv) {
+ absl::PrintF("Hello Abseil!\n");
+ return EXIT_SUCCESS;
+}
+EOF
+export PKG_CONFIG_PATH="${install_dir}/${libdir}/pkgconfig"
+pc_args=($(pkg-config --cflags --libs --static absl_str_format))
+g++ -static -o hello-abseil hello-abseil.cc "${pc_args[@]}"
+hello="$(./hello-abseil)"
+[[ "${hello}" == "Hello Abseil!" ]]
+popd
+
+uninstall_absl
+popd
+
+if [[ ! "${lts_install}" ]]; then
+ # Test that we warn if installed without a prefix or a system prefix
+ output="$(install_absl 2>&1)"
+ if [[ "${output}" != *"Please set CMAKE_INSTALL_PREFIX"* ]]; then
+ echo "Install without prefix didn't warn as expected. Output:"
+ echo "${output}"
+ exit 1
+ fi
+ uninstall_absl
+
+ output="$(install_absl /usr 2>&1)"
+ if [[ "${output}" != *"Please set CMAKE_INSTALL_PREFIX"* ]]; then
+ echo "Install with /usr didn't warn as expected. Output:"
+ echo "${output}"
+ exit 1
+ fi
+ uninstall_absl
+fi
+
+echo "Install test complete!"
+exit 0
diff --git a/third_party/abseil/src/CMakeLists.txt b/third_party/abseil/src/CMakeLists.txt
new file mode 100644
index 0000000..c1ae8d5
--- /dev/null
+++ b/third_party/abseil/src/CMakeLists.txt
@@ -0,0 +1,197 @@
+#
+# Copyright 2017 The Abseil Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+# Most widely used distributions have cmake 3.5 or greater available as of March
+# 2019. A notable exception is RHEL-7 (CentOS7). You can install a current
+# version of CMake by first installing Extra Packages for Enterprise Linux
+# (https://fedoraproject.org/wiki/EPEL#Extra_Packages_for_Enterprise_Linux_.28EPEL.29)
+# and then issuing `yum install cmake3` on the command line.
+cmake_minimum_required(VERSION 3.5)
+
+# Compiler id for Apple Clang is now AppleClang.
+if (POLICY CMP0025)
+ cmake_policy(SET CMP0025 NEW)
+endif (POLICY CMP0025)
+
+# if command can use IN_LIST
+if (POLICY CMP0057)
+ cmake_policy(SET CMP0057 NEW)
+endif (POLICY CMP0057)
+
+# Project version variables are the empty string if version is unspecified
+if (POLICY CMP0048)
+ cmake_policy(SET CMP0048 NEW)
+endif (POLICY CMP0048)
+
+# option() honor variables
+if (POLICY CMP0077)
+ cmake_policy(SET CMP0077 NEW)
+endif (POLICY CMP0077)
+
+project(absl CXX)
+
+# Output directory is correct by default for most build setups. However, when
+# building Abseil as a DLL, it is important to have the DLL in the same
+# directory as the executable using it. Thus, we put all executables in a single
+# /bin directory.
+set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
+
+# when absl is included as subproject (i.e. using add_subdirectory(abseil-cpp))
+# in the source tree of a project that uses it, install rules are disabled.
+if(NOT "^${CMAKE_SOURCE_DIR}$" STREQUAL "^${PROJECT_SOURCE_DIR}$")
+ option(ABSL_ENABLE_INSTALL "Enable install rule" OFF)
+else()
+ option(ABSL_ENABLE_INSTALL "Enable install rule" ON)
+endif()
+
+list(APPEND CMAKE_MODULE_PATH
+ ${CMAKE_CURRENT_LIST_DIR}/CMake
+ ${CMAKE_CURRENT_LIST_DIR}/absl/copts
+)
+
+include(AbseilInstallDirs)
+include(CMakePackageConfigHelpers)
+include(AbseilDll)
+include(AbseilHelpers)
+
+
+##
+## Using absl targets
+##
+## all public absl targets are
+## exported with the absl:: prefix
+##
+## e.g absl::base absl::synchronization absl::strings ....
+##
+## DO NOT rely on the internal targets outside of the prefix
+
+
+# include current path
+list(APPEND ABSL_COMMON_INCLUDE_DIRS ${CMAKE_CURRENT_SOURCE_DIR})
+
+if("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang")
+ set(ABSL_USING_CLANG ON)
+else()
+ set(ABSL_USING_CLANG OFF)
+endif()
+
+# find dependencies
+## pthread
+find_package(Threads REQUIRED)
+
+option(ABSL_USE_EXTERNAL_GOOGLETEST
+ "If ON, Abseil will assume that the targets for GoogleTest are already provided by the including project. This makes sense when Abseil is used with add_subproject." OFF)
+
+option(ABSL_USE_GOOGLETEST_HEAD
+ "If ON, abseil will download HEAD from GoogleTest at config time." OFF)
+
+set(ABSL_GOOGLETEST_DOWNLOAD_URL "" CACHE STRING "If set, download GoogleTest from this URL")
+
+set(ABSL_LOCAL_GOOGLETEST_DIR "/usr/src/googletest" CACHE PATH
+ "If ABSL_USE_GOOGLETEST_HEAD is OFF and ABSL_GOOGLETEST_URL is not set, specifies the directory of a local GoogleTest checkout."
+ )
+
+option(ABSL_RUN_TESTS "If ON, Abseil tests will be run." OFF)
+
+if(${ABSL_RUN_TESTS})
+ # enable CTest. This will set BUILD_TESTING to ON unless otherwise specified
+ # on the command line
+ include(CTest)
+
+ ## check targets
+ if (NOT ABSL_USE_EXTERNAL_GOOGLETEST)
+ set(absl_gtest_build_dir ${CMAKE_BINARY_DIR}/googletest-build)
+ if(ABSL_USE_GOOGLETEST_HEAD AND ABSL_GOOGLETEST_DOWNLOAD_URL)
+ message(FATAL_ERROR "Do not set both ABSL_USE_GOOGLETEST_HEAD and ABSL_GOOGLETEST_DOWNLOAD_URL")
+ endif()
+ if(ABSL_USE_GOOGLETEST_HEAD)
+ set(absl_gtest_download_url "https://github.com/google/googletest/archive/master.zip")
+ elseif(ABSL_GOOGLETEST_DOWNLOAD_URL)
+ set(absl_gtest_download_url ${ABSL_GOOGLETEST_DOWNLOAD_URL})
+ endif()
+ if(absl_gtest_download_url)
+ set(absl_gtest_src_dir ${CMAKE_BINARY_DIR}/googletest-src)
+ else()
+ set(absl_gtest_src_dir ${ABSL_LOCAL_GOOGLETEST_DIR})
+ endif()
+ include(CMake/Googletest/DownloadGTest.cmake)
+ endif()
+
+ check_target(gtest)
+ check_target(gtest_main)
+ check_target(gmock)
+
+ list(APPEND ABSL_TEST_COMMON_LIBRARIES
+ gtest_main
+ gtest
+ gmock
+ ${CMAKE_THREAD_LIBS_INIT}
+ )
+endif()
+
+add_subdirectory(absl)
+
+if(ABSL_ENABLE_INSTALL)
+ # absl:lts-remove-begin(system installation is supported for LTS releases)
+ # We don't support system-wide installation
+ list(APPEND SYSTEM_INSTALL_DIRS "/usr/local" "/usr" "/opt/" "/opt/local" "c:/Program Files/${PROJECT_NAME}")
+ if(NOT DEFINED CMAKE_INSTALL_PREFIX OR CMAKE_INSTALL_PREFIX IN_LIST SYSTEM_INSTALL_DIRS)
+ message(WARNING "\
+ The default and system-level install directories are unsupported except in LTS \
+ releases of Abseil. Please set CMAKE_INSTALL_PREFIX to install Abseil in your \
+ source or build tree directly.\
+ ")
+ endif()
+ # absl:lts-remove-end
+
+ # install as a subdirectory only
+ install(EXPORT ${PROJECT_NAME}Targets
+ NAMESPACE absl::
+ DESTINATION "${ABSL_INSTALL_CONFIGDIR}"
+ )
+
+ configure_package_config_file(
+ CMake/abslConfig.cmake.in
+ "${PROJECT_BINARY_DIR}/${PROJECT_NAME}Config.cmake"
+ INSTALL_DESTINATION "${ABSL_INSTALL_CONFIGDIR}"
+ )
+ install(FILES "${PROJECT_BINARY_DIR}/${PROJECT_NAME}Config.cmake"
+ DESTINATION "${ABSL_INSTALL_CONFIGDIR}"
+ )
+
+ # Abseil only has a version in LTS releases. This mechanism is accomplished
+ # Abseil's internal Copybara (https://github.com/google/copybara) workflows and
+ # isn't visible in the CMake buildsystem itself.
+ if(absl_VERSION)
+ write_basic_package_version_file(
+ "${PROJECT_BINARY_DIR}/${PROJECT_NAME}ConfigVersion.cmake"
+ COMPATIBILITY ExactVersion
+ )
+
+ install(FILES "${PROJECT_BINARY_DIR}/${PROJECT_NAME}ConfigVersion.cmake"
+ DESTINATION ${ABSL_INSTALL_CONFIGDIR}
+ )
+ endif() # absl_VERSION
+
+ install(DIRECTORY absl
+ DESTINATION ${ABSL_INSTALL_INCLUDEDIR}
+ FILES_MATCHING
+ PATTERN "*.inc"
+ PATTERN "*.h"
+ PATTERN "copts" EXCLUDE
+ PATTERN "testdata" EXCLUDE
+ )
+endif() # ABSL_ENABLE_INSTALL
diff --git a/third_party/abseil/src/CONTRIBUTING.md b/third_party/abseil/src/CONTRIBUTING.md
new file mode 100644
index 0000000..9dadae9
--- /dev/null
+++ b/third_party/abseil/src/CONTRIBUTING.md
@@ -0,0 +1,141 @@
+# How to Contribute to Abseil
+
+We'd love to accept your patches and contributions to this project. There are
+just a few small guidelines you need to follow.
+
+NOTE: If you are new to GitHub, please start by reading [Pull Request
+howto](https://help.github.com/articles/about-pull-requests/)
+
+## Contributor License Agreement
+
+Contributions to this project must be accompanied by a Contributor License
+Agreement. You (or your employer) retain the copyright to your contribution,
+this simply gives us permission to use and redistribute your contributions as
+part of the project. Head over to <https://cla.developers.google.com/> to see
+your current agreements on file or to sign a new one.
+
+You generally only need to submit a CLA once, so if you've already submitted one
+(even if it was for a different project), you probably don't need to do it
+again.
+
+## Contribution Guidelines
+
+Potential contributors sometimes ask us if the Abseil project is the appropriate
+home for their utility library code or for specific functions implementing
+missing portions of the standard. Often, the answer to this question is "no".
+We’d like to articulate our thinking on this issue so that our choices can be
+understood by everyone and so that contributors can have a better intuition
+about whether Abseil might be interested in adopting a new library.
+
+### Priorities
+
+Although our mission is to augment the C++ standard library, our goal is not to
+provide a full forward-compatible implementation of the latest standard. For us
+to consider a library for inclusion in Abseil, it is not enough that a library
+is useful. We generally choose to release a library when it meets at least one
+of the following criteria:
+
+* **Widespread usage** - Using our internal codebase to help gauge usage, most
+ of the libraries we've released have tens of thousands of users.
+* **Anticipated widespread usage** - Pre-adoption of some standard-compliant
+ APIs may not have broad adoption initially but can be expected to pick up
+ usage when it replaces legacy APIs. `absl::from_chars`, for example,
+ replaces existing code that converts strings to numbers and will therefore
+ likely see usage growth.
+* **High impact** - APIs that provide a key solution to a specific problem,
+ such as `absl::FixedArray`, have higher impact than usage numbers may signal
+ and are released because of their importance.
+* **Direct support for a library that falls under one of the above** - When we
+ want access to a smaller library as an implementation detail for a
+ higher-priority library we plan to release, we may release it, as we did
+ with portions of `absl/meta/type_traits.h`. One consequence of this is that
+ the presence of a library in Abseil does not necessarily mean that other
+ similar libraries would be a high priority.
+
+### API Freeze Consequences
+
+Via the
+[Abseil Compatibility Guidelines](https://abseil.io/about/compatibility), we
+have promised a large degree of API stability. In particular, we will not make
+backward-incompatible changes to released APIs without also shipping a tool or
+process that can upgrade our users' code. We are not yet at the point of easily
+releasing such tools. Therefore, at this time, shipping a library establishes an
+API contract which is borderline unchangeable. (We can add new functionality,
+but we cannot easily change existing behavior.) This constraint forces us to
+very carefully review all APIs that we ship.
+
+
+## Coding Style
+
+To keep the source consistent, readable, diffable and easy to merge, we use a
+fairly rigid coding style, as defined by the
+[google-styleguide](https://github.com/google/styleguide) project. All patches
+will be expected to conform to the style outlined
+[here](https://google.github.io/styleguide/cppguide.html).
+
+## Guidelines for Pull Requests
+
+* If you are a Googler, it is preferable to first create an internal CL and
+ have it reviewed and submitted. The code propagation process will deliver
+ the change to GitHub.
+
+* Create **small PRs** that are narrowly focused on **addressing a single
+ concern**. We often receive PRs that are trying to fix several things at a
+ time, but if only one fix is considered acceptable, nothing gets merged and
+ both author's & review's time is wasted. Create more PRs to address
+ different concerns and everyone will be happy.
+
+* For speculative changes, consider opening an [Abseil
+ issue](https://github.com/abseil/abseil-cpp/issues) and discussing it first.
+ If you are suggesting a behavioral or API change, consider starting with an
+ [Abseil proposal template](ABSEIL_ISSUE_TEMPLATE.md).
+
+* Provide a good **PR description** as a record of **what** change is being
+ made and **why** it was made. Link to a GitHub issue if it exists.
+
+* Don't fix code style and formatting unless you are already changing that
+ line to address an issue. Formatting of modified lines may be done using
+ `git clang-format`. PRs with irrelevant changes won't be merged. If
+ you do want to fix formatting or style, do that in a separate PR.
+
+* Unless your PR is trivial, you should expect there will be reviewer comments
+ that you'll need to address before merging. We expect you to be reasonably
+ responsive to those comments, otherwise the PR will be closed after 2-3
+ weeks of inactivity.
+
+* Maintain **clean commit history** and use **meaningful commit messages**.
+ PRs with messy commit history are difficult to review and won't be merged.
+ Use `rebase -i upstream/master` to curate your commit history and/or to
+ bring in latest changes from master (but avoid rebasing in the middle of a
+ code review).
+
+* Keep your PR up to date with upstream/master (if there are merge conflicts,
+ we can't really merge your change).
+
+* **All tests need to be passing** before your change can be merged. We
+ recommend you **run tests locally** (see below)
+
+* Exceptions to the rules can be made if there's a compelling reason for doing
+ so. That is - the rules are here to serve us, not the other way around, and
+ the rules need to be serving their intended purpose to be valuable.
+
+* All submissions, including submissions by project members, require review.
+
+## Running Tests
+
+If you have [Bazel](https://bazel.build/) installed, use `bazel test
+--test_tag_filters="-benchmark" ...` to run the unit tests.
+
+If you are running the Linux operating system and have
+[Docker](https://www.docker.com/) installed, you can also run the `linux_*.sh`
+scripts under the `ci/`(https://github.com/abseil/abseil-cpp/tree/master/ci)
+directory to test Abseil under a variety of conditions.
+
+## Abseil Committers
+
+The current members of the Abseil engineering team are the only committers at
+present.
+
+## Release Process
+
+Abseil lives at head, where latest-and-greatest code can be found.
diff --git a/third_party/abseil/src/FAQ.md b/third_party/abseil/src/FAQ.md
new file mode 100644
index 0000000..78028fc
--- /dev/null
+++ b/third_party/abseil/src/FAQ.md
@@ -0,0 +1,164 @@
+# Abseil FAQ
+
+## Is Abseil the right home for my utility library?
+
+Most often the answer to the question is "no." As both the [About
+Abseil](https://abseil.io/about/) page and our [contributing
+guidelines](https://github.com/abseil/abseil-cpp/blob/master/CONTRIBUTING.md#contribution-guidelines)
+explain, Abseil contains a variety of core C++ library code that is widely used
+at [Google](https://www.google.com/). As such, Abseil's primary purpose is to be
+used as a dependency by Google's open source C++ projects. While we do hope that
+Abseil is also useful to the C++ community at large, this added constraint also
+means that we are unlikely to accept a contribution of utility code that isn't
+already widely used by Google.
+
+## How to I set the C++ dialect used to build Abseil?
+
+The short answer is that whatever mechanism you choose, you need to make sure
+that you set this option consistently at the global level for your entire
+project. If, for example, you want to set the C++ dialect to C++17, with
+[Bazel](https://bazel/build/) as the build system and `gcc` or `clang` as the
+compiler, there several ways to do this:
+* Pass `--cxxopt=-std=c++17` on the command line (for example, `bazel build
+ --cxxopt=-std=c++17 ...`)
+* Set the environment variable `BAZEL_CXXOPTS` (for example,
+ `BAZEL_CXXOPTS=-std=c++17`)
+* Add `build --cxxopt=-std=c++17` to your [`.bazelrc`
+ file](https://docs.bazel.build/versions/master/guide.html#bazelrc)
+
+If you are using CMake as the build system, you'll need to add a line like
+`set(CMAKE_CXX_STANDARD 17)` to your top level `CMakeLists.txt` file. See the
+[CMake build
+instructions](https://github.com/abseil/abseil-cpp/blob/master/CMake/README.md)
+for more information.
+
+For a longer answer to this question and to understand why some other approaches
+don't work, see the answer to ["What is ABI and why don't you recommend using a
+pre-compiled version of
+Abseil?"](#what-is-abi-and-why-dont-you-recommend-using-a-pre-compiled-version-of-abseil)
+
+## What is ABI and why don't you recommend using a pre-compiled version of Abseil?
+
+For the purposes of this discussion, you can think of
+[ABI](https://en.wikipedia.org/wiki/Application_binary_interface) as the
+compiled representation of the interfaces in code. This is in contrast to
+[API](https://en.wikipedia.org/wiki/Application_programming_interface), which
+you can think of as the interfaces as defined by the code itself. [Abseil has a
+strong promise of API compatibility, but does not make any promise of ABI
+compatibility](https://abseil.io/about/compatibility). Let's take a look at what
+this means in practice.
+
+You might be tempted to do something like this in a
+[Bazel](https://bazel.build/) `BUILD` file:
+
+```
+# DON'T DO THIS!!!
+cc_library(
+ name = "my_library",
+ srcs = ["my_library.cc"],
+ copts = ["-std=c++17"], # May create a mixed-mode compile!
+ deps = ["@com_google_absl//absl/strings"],
+)
+```
+
+Applying `-std=c++17` to an individual target in your `BUILD` file is going to
+compile that specific target in C++17 mode, but it isn't going to ensure the
+Abseil library is built in C++17 mode, since the Abseil library itself is a
+different build target. If your code includes an Abseil header, then your
+program may contain conflicting definitions of the same
+class/function/variable/enum, etc. As a rule, all compile options that affect
+the ABI of a program need to be applied to the entire build on a global basis.
+
+C++ has something called the [One Definition
+Rule](https://en.wikipedia.org/wiki/One_Definition_Rule) (ODR). C++ doesn't
+allow multiple definitions of the same class/function/variable/enum, etc. ODR
+violations sometimes result in linker errors, but linkers do not always catch
+violations. Uncaught ODR violations can result in strange runtime behaviors or
+crashes that can be hard to debug.
+
+If you build the Abseil library and your code using different compile options
+that affect ABI, there is a good chance you will run afoul of the One Definition
+Rule. Examples of GCC compile options that affect ABI include (but aren't
+limited to) language dialect (e.g. `-std=`), optimization level (e.g. `-O2`),
+code generation flags (e.g. `-fexceptions`), and preprocessor defines
+(e.g. `-DNDEBUG`).
+
+If you use a pre-compiled version of Abseil, (for example, from your Linux
+distribution package manager or from something like
+[vcpkg](https://github.com/microsoft/vcpkg)) you have to be very careful to
+ensure ABI compatibility across the components of your program. The only way you
+can be sure your program is going to be correct regarding ABI is to ensure
+you've used the exact same compile options as were used to build the
+pre-compiled library. This does not mean that Abseil cannot work as part of a
+Linux distribution since a knowledgeable binary packager will have ensured that
+all packages have been built with consistent compile options. This is one of the
+reasons we warn against - though do not outright reject - using Abseil as a
+pre-compiled library.
+
+Another possible way that you might afoul of ABI issues is if you accidentally
+include two versions of Abseil in your program. Multiple versions of Abseil can
+end up within the same binary if your program uses the Abseil library and
+another library also transitively depends on Abseil (resulting in what is
+sometimes called the diamond dependency problem). In cases such as this you must
+structure your build so that all libraries use the same version of Abseil.
+[Abseil's strong promise of API compatibility between
+releases](https://abseil.io/about/compatibility) means the latest "HEAD" release
+of Abseil is almost certainly the right choice if you are doing as we recommend
+and building all of your code from source.
+
+For these reasons we recommend you avoid pre-compiled code and build the Abseil
+library yourself in a consistent manner with the rest of your code.
+
+## What is "live at head" and how do I do it?
+
+From Abseil's point-of-view, "live at head" means that every Abseil source
+release (which happens on an almost daily basis) is either API compatible with
+the previous release, or comes with an automated tool that you can run over code
+to make it compatible. In practice, the need to use an automated tool is
+extremely rare. This means that upgrading from one source release to another
+should be a routine practice that can and should be performed often.
+
+We recommend you update to the [latest commit in the `master` branch of
+Abseil](https://github.com/abseil/abseil-cpp/commits/master) as often as
+possible. Not only will you pick up bug fixes more quickly, but if you have good
+automated testing, you will catch and be able to fix any [Hyrum's
+Law](https://www.hyrumslaw.com/) dependency problems on an incremental basis
+instead of being overwhelmed by them and having difficulty isolating them if you
+wait longer between updates.
+
+If you are using the [Bazel](https://bazel.build/) build system and its
+[external dependencies](https://docs.bazel.build/versions/master/external.html)
+feature, updating the
+[`http_archive`](https://docs.bazel.build/versions/master/repo/http.html#http_archive)
+rule in your
+[`WORKSPACE`](https://docs.bazel.build/versions/master/be/workspace.html) for
+`com_google_abseil` to point to the [latest commit in the `master` branch of
+Abseil](https://github.com/abseil/abseil-cpp/commits/master) is all you need to
+do. For example, on February 11, 2020, the latest commit to the master branch
+was `98eb410c93ad059f9bba1bf43f5bb916fc92a5ea`. To update to this commit, you
+would add the following snippet to your `WORKSPACE` file:
+
+```
+http_archive(
+ name = "com_google_absl",
+ urls = ["https://github.com/abseil/abseil-cpp/archive/98eb410c93ad059f9bba1bf43f5bb916fc92a5ea.zip"], # 2020-02-11T18:50:53Z
+ strip_prefix = "abseil-cpp-98eb410c93ad059f9bba1bf43f5bb916fc92a5ea",
+ sha256 = "aabf6c57e3834f8dc3873a927f37eaf69975d4b28117fc7427dfb1c661542a87",
+)
+```
+
+To get the `sha256` of this URL, run `curl -sL --output -
+https://github.com/abseil/abseil-cpp/archive/98eb410c93ad059f9bba1bf43f5bb916fc92a5ea.zip
+| sha256sum -`.
+
+You can commit the updated `WORKSPACE` file to your source control every time
+you update, and if you have good automated testing, you might even consider
+automating this.
+
+One thing we don't recommend is using GitHub's `master.zip` files (for example
+[https://github.com/abseil/abseil-cpp/archive/master.zip](https://github.com/abseil/abseil-cpp/archive/master.zip)),
+which are always the latest commit in the `master` branch, to implement live at
+head. Since these `master.zip` URLs are not versioned, you will lose build
+reproducibility. In addition, some build systems, including Bazel, will simply
+cache this file, which means you won't actually be updating to the latest
+release until your cache is cleared or invalidated.
diff --git a/third_party/abseil/src/LICENSE b/third_party/abseil/src/LICENSE
new file mode 100644
index 0000000..ccd61dc
--- /dev/null
+++ b/third_party/abseil/src/LICENSE
@@ -0,0 +1,203 @@
+
+ Apache License
+ Version 2.0, January 2004
+ https://www.apache.org/licenses/
+
+ TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
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+ 5. Submission of Contributions. Unless You explicitly state otherwise,
+ any Contribution intentionally submitted for inclusion in the Work
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+ Notwithstanding the above, nothing herein shall supersede or modify
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+ 8. Limitation of Liability. In no event and under no legal theory,
+ whether in tort (including negligence), contract, or otherwise,
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+ APPENDIX: How to apply the Apache License to your work.
+
+ To apply the Apache License to your work, attach the following
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+ Copyright [yyyy] [name of copyright owner]
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
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+ https://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+
diff --git a/third_party/abseil/src/LTS.md b/third_party/abseil/src/LTS.md
new file mode 100644
index 0000000..ade8b17
--- /dev/null
+++ b/third_party/abseil/src/LTS.md
@@ -0,0 +1,16 @@
+# Long Term Support (LTS) Branches
+
+This repository contains periodic snapshots of the Abseil codebase that are
+Long Term Support (LTS) branches. An LTS branch allows you to use a known
+version of Abseil without interfering with other projects which may also, in
+turn, use Abseil. (For more information about our releases, see the
+[Abseil Release Management](https://abseil.io/about/releases) guide.)
+
+## LTS Branches
+
+The following lists LTS branches and the dates on which they have been released:
+
+* [LTS Branch December 18, 2018](https://github.com/abseil/abseil-cpp/tree/lts_2018_12_18/)
+* [LTS Branch June 20, 2018](https://github.com/abseil/abseil-cpp/tree/lts_2018_06_20/)
+* [LTS Branch August 8, 2019](https://github.com/abseil/abseil-cpp/tree/lts_2019_08_08/)
+* [LTS Branch February 25, 2020](https://github.com/abseil/abseil-cpp/tree/lts_2020_02_25/)
diff --git a/third_party/abseil/src/README.md b/third_party/abseil/src/README.md
new file mode 100644
index 0000000..85de569
--- /dev/null
+++ b/third_party/abseil/src/README.md
@@ -0,0 +1,114 @@
+# Abseil - C++ Common Libraries
+
+The repository contains the Abseil C++ library code. Abseil is an open-source
+collection of C++ code (compliant to C++11) designed to augment the C++
+standard library.
+
+## Table of Contents
+
+- [About Abseil](#about)
+- [Quickstart](#quickstart)
+- [Building Abseil](#build)
+- [Codemap](#codemap)
+- [License](#license)
+- [Links](#links)
+
+<a name="about"></a>
+## About Abseil
+
+Abseil is an open-source collection of C++ library code designed to augment
+the C++ standard library. The Abseil library code is collected from Google's
+own C++ code base, has been extensively tested and used in production, and
+is the same code we depend on in our daily coding lives.
+
+In some cases, Abseil provides pieces missing from the C++ standard; in
+others, Abseil provides alternatives to the standard for special needs
+we've found through usage in the Google code base. We denote those cases
+clearly within the library code we provide you.
+
+Abseil is not meant to be a competitor to the standard library; we've
+just found that many of these utilities serve a purpose within our code
+base, and we now want to provide those resources to the C++ community as
+a whole.
+
+<a name="quickstart"></a>
+## Quickstart
+
+If you want to just get started, make sure you at least run through the
+[Abseil Quickstart](https://abseil.io/docs/cpp/quickstart). The Quickstart
+contains information about setting up your development environment, downloading
+the Abseil code, running tests, and getting a simple binary working.
+
+<a name="build"></a>
+## Building Abseil
+
+[Bazel](https://bazel.build) is the official build system for Abseil,
+which is supported on most major platforms (Linux, Windows, macOS, for example)
+and compilers. See the [quickstart](https://abseil.io/docs/cpp/quickstart) for
+more information on building Abseil using the Bazel build system.
+
+<a name="cmake"></a>
+If you require CMake support, please check the
+[CMake build instructions](CMake/README.md).
+
+## Codemap
+
+Abseil contains the following C++ library components:
+
+* [`base`](absl/base/) Abseil Fundamentals
+ <br /> The `base` library contains initialization code and other code which
+ all other Abseil code depends on. Code within `base` may not depend on any
+ other code (other than the C++ standard library).
+* [`algorithm`](absl/algorithm/)
+ <br /> The `algorithm` library contains additions to the C++ `<algorithm>`
+ library and container-based versions of such algorithms.
+* [`container`](absl/container/)
+ <br /> The `container` library contains additional STL-style containers,
+ including Abseil's unordered "Swiss table" containers.
+* [`debugging`](absl/debugging/)
+ <br /> The `debugging` library contains code useful for enabling leak
+ checks, and stacktrace and symbolization utilities.
+* [`hash`](absl/hash/)
+ <br /> The `hash` library contains the hashing framework and default hash
+ functor implementations for hashable types in Abseil.
+* [`memory`](absl/memory/)
+ <br /> The `memory` library contains C++11-compatible versions of
+ `std::make_unique()` and related memory management facilities.
+* [`meta`](absl/meta/)
+ <br /> The `meta` library contains C++11-compatible versions of type checks
+ available within C++14 and C++17 versions of the C++ `<type_traits>` library.
+* [`numeric`](absl/numeric/)
+ <br /> The `numeric` library contains C++11-compatible 128-bit integers.
+* [`strings`](absl/strings/)
+ <br /> The `strings` library contains a variety of strings routines and
+ utilities, including a C++11-compatible version of the C++17
+ `std::string_view` type.
+* [`synchronization`](absl/synchronization/)
+ <br /> The `synchronization` library contains concurrency primitives (Abseil's
+ `absl::Mutex` class, an alternative to `std::mutex`) and a variety of
+ synchronization abstractions.
+* [`time`](absl/time/)
+ <br /> The `time` library contains abstractions for computing with absolute
+ points in time, durations of time, and formatting and parsing time within
+ time zones.
+* [`types`](absl/types/)
+ <br /> The `types` library contains non-container utility types, like a
+ C++11-compatible version of the C++17 `std::optional` type.
+* [`utility`](absl/utility/)
+ <br /> The `utility` library contains utility and helper code.
+
+## License
+
+The Abseil C++ library is licensed under the terms of the Apache
+license. See [LICENSE](LICENSE) for more information.
+
+## Links
+
+For more information about Abseil:
+
+* Consult our [Abseil Introduction](https://abseil.io/about/intro)
+* Read [Why Adopt Abseil](https://abseil.io/about/philosophy) to understand our
+ design philosophy.
+* Peruse our
+ [Abseil Compatibility Guarantees](https://abseil.io/about/compatibility) to
+ understand both what we promise to you, and what we expect of you in return.
diff --git a/third_party/abseil/src/UPGRADES.md b/third_party/abseil/src/UPGRADES.md
new file mode 100644
index 0000000..35599d0
--- /dev/null
+++ b/third_party/abseil/src/UPGRADES.md
@@ -0,0 +1,17 @@
+# C++ Upgrade Tools
+
+Abseil may occassionally release API-breaking changes. As noted in our
+[Compatibility Guidelines][compatibility-guide], we will aim to provide a tool
+to do the work of effecting such API-breaking changes, when absolutely
+necessary.
+
+These tools will be listed on the [C++ Upgrade Tools][upgrade-tools] guide on
+https://abseil.io.
+
+For more information, the [C++ Automated Upgrade Guide][api-upgrades-guide]
+outlines this process.
+
+[compatibility-guide]: https://abseil.io/about/compatibility
+[api-upgrades-guide]: https://abseil.io/docs/cpp/tools/api-upgrades
+[upgrade-tools]: https://abseil.io/docs/cpp/tools/upgrades/
+
diff --git a/third_party/abseil/src/WORKSPACE b/third_party/abseil/src/WORKSPACE
new file mode 100644
index 0000000..ed90d2b
--- /dev/null
+++ b/third_party/abseil/src/WORKSPACE
@@ -0,0 +1,45 @@
+#
+# Copyright 2019 The Abseil Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+workspace(name = "com_google_absl")
+load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
+
+# GoogleTest/GoogleMock framework. Used by most unit-tests.
+http_archive(
+ name = "com_google_googletest",
+ # Keep this URL in sync with ABSL_GOOGLETEST_COMMIT in ci/cmake_common.sh.
+ urls = ["https://github.com/google/googletest/archive/8567b09290fe402cf01923e2131c5635b8ed851b.zip"], # 2020-06-12T22:24:28Z
+ strip_prefix = "googletest-8567b09290fe402cf01923e2131c5635b8ed851b",
+ sha256 = "9a8a166eb6a56c7b3d7b19dc2c946fe4778fd6f21c7a12368ad3b836d8f1be48",
+)
+
+# Google benchmark.
+http_archive(
+ name = "com_github_google_benchmark",
+ urls = ["https://github.com/google/benchmark/archive/16703ff83c1ae6d53e5155df3bb3ab0bc96083be.zip"],
+ strip_prefix = "benchmark-16703ff83c1ae6d53e5155df3bb3ab0bc96083be",
+ sha256 = "59f918c8ccd4d74b6ac43484467b500f1d64b40cc1010daa055375b322a43ba3",
+)
+
+# C++ rules for Bazel.
+http_archive(
+ name = "rules_cc",
+ sha256 = "9a446e9dd9c1bb180c86977a8dc1e9e659550ae732ae58bd2e8fd51e15b2c91d",
+ strip_prefix = "rules_cc-262ebec3c2296296526740db4aefce68c80de7fa",
+ urls = [
+ "https://github.com/bazelbuild/rules_cc/archive/262ebec3c2296296526740db4aefce68c80de7fa.zip",
+ ],
+)
diff --git a/third_party/abseil/src/absl/BUILD.bazel b/third_party/abseil/src/absl/BUILD.bazel
new file mode 100644
index 0000000..6da20c4
--- /dev/null
+++ b/third_party/abseil/src/absl/BUILD.bazel
@@ -0,0 +1,65 @@
+#
+# Copyright 2017 The Abseil Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+package(default_visibility = ["//visibility:public"])
+
+licenses(["notice"])
+
+config_setting(
+ name = "clang_compiler",
+ flag_values = {
+ "@bazel_tools//tools/cpp:compiler": "clang",
+ },
+ visibility = [":__subpackages__"],
+)
+
+config_setting(
+ name = "osx",
+ constraint_values = [
+ "@bazel_tools//platforms:osx",
+ ],
+)
+
+config_setting(
+ name = "ios",
+ constraint_values = [
+ "@bazel_tools//platforms:ios",
+ ],
+)
+
+config_setting(
+ name = "windows",
+ constraint_values = [
+ "@bazel_tools//platforms:x86_64",
+ "@bazel_tools//platforms:windows",
+ ],
+ visibility = [":__subpackages__"],
+)
+
+config_setting(
+ name = "ppc",
+ values = {
+ "cpu": "ppc",
+ },
+ visibility = [":__subpackages__"],
+)
+
+config_setting(
+ name = "wasm",
+ values = {
+ "cpu": "wasm32",
+ },
+ visibility = [":__subpackages__"],
+)
diff --git a/third_party/abseil/src/absl/CMakeLists.txt b/third_party/abseil/src/absl/CMakeLists.txt
new file mode 100644
index 0000000..fbfa782
--- /dev/null
+++ b/third_party/abseil/src/absl/CMakeLists.txt
@@ -0,0 +1,37 @@
+#
+# Copyright 2017 The Abseil Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+add_subdirectory(base)
+add_subdirectory(algorithm)
+add_subdirectory(container)
+add_subdirectory(debugging)
+add_subdirectory(flags)
+add_subdirectory(functional)
+add_subdirectory(hash)
+add_subdirectory(memory)
+add_subdirectory(meta)
+add_subdirectory(numeric)
+add_subdirectory(random)
+add_subdirectory(status)
+add_subdirectory(strings)
+add_subdirectory(synchronization)
+add_subdirectory(time)
+add_subdirectory(types)
+add_subdirectory(utility)
+
+if (${ABSL_BUILD_DLL})
+ absl_make_dll()
+endif()
diff --git a/third_party/abseil/src/absl/abseil.podspec.gen.py b/third_party/abseil/src/absl/abseil.podspec.gen.py
new file mode 100755
index 0000000..6375298
--- /dev/null
+++ b/third_party/abseil/src/absl/abseil.podspec.gen.py
@@ -0,0 +1,229 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+"""This script generates abseil.podspec from all BUILD.bazel files.
+
+This is expected to run on abseil git repository with Bazel 1.0 on Linux.
+It recursively analyzes BUILD.bazel files using query command of Bazel to
+dump its build rules in XML format. From these rules, it constructs podspec
+structure.
+"""
+
+import argparse
+import collections
+import os
+import re
+import subprocess
+import xml.etree.ElementTree
+
+# Template of root podspec.
+SPEC_TEMPLATE = """
+# This file has been automatically generated from a script.
+# Please make modifications to `abseil.podspec.gen.py` instead.
+Pod::Spec.new do |s|
+ s.name = 'abseil'
+ s.version = '${version}'
+ s.summary = 'Abseil Common Libraries (C++) from Google'
+ s.homepage = 'https://abseil.io'
+ s.license = 'Apache License, Version 2.0'
+ s.authors = { 'Abseil Team' => 'abseil-io@googlegroups.com' }
+ s.source = {
+ :git => 'https://github.com/abseil/abseil-cpp.git',
+ :tag => '${tag}',
+ }
+ s.module_name = 'absl'
+ s.header_mappings_dir = 'absl'
+ s.header_dir = 'absl'
+ s.libraries = 'c++'
+ s.compiler_flags = '-Wno-everything'
+ s.pod_target_xcconfig = {
+ 'USER_HEADER_SEARCH_PATHS' => '$(inherited) "$(PODS_TARGET_SRCROOT)"',
+ 'USE_HEADERMAP' => 'NO',
+ 'ALWAYS_SEARCH_USER_PATHS' => 'NO',
+ }
+ s.ios.deployment_target = '9.0'
+ s.osx.deployment_target = '10.10'
+ s.tvos.deployment_target = '9.0'
+ s.watchos.deployment_target = '2.0'
+"""
+
+# Rule object representing the rule of Bazel BUILD.
+Rule = collections.namedtuple(
+ "Rule", "type name package srcs hdrs textual_hdrs deps visibility testonly")
+
+
+def get_elem_value(elem, name):
+ """Returns the value of XML element with the given name."""
+ for child in elem:
+ if child.attrib.get("name") != name:
+ continue
+ if child.tag == "string":
+ return child.attrib.get("value")
+ if child.tag == "boolean":
+ return child.attrib.get("value") == "true"
+ if child.tag == "list":
+ return [nested_child.attrib.get("value") for nested_child in child]
+ raise "Cannot recognize tag: " + child.tag
+ return None
+
+
+def normalize_paths(paths):
+ """Returns the list of normalized path."""
+ # e.g. ["//absl/strings:dir/header.h"] -> ["absl/strings/dir/header.h"]
+ return [path.lstrip("/").replace(":", "/") for path in paths]
+
+
+def parse_rule(elem, package):
+ """Returns a rule from bazel XML rule."""
+ return Rule(
+ type=elem.attrib["class"],
+ name=get_elem_value(elem, "name"),
+ package=package,
+ srcs=normalize_paths(get_elem_value(elem, "srcs") or []),
+ hdrs=normalize_paths(get_elem_value(elem, "hdrs") or []),
+ textual_hdrs=normalize_paths(get_elem_value(elem, "textual_hdrs") or []),
+ deps=get_elem_value(elem, "deps") or [],
+ visibility=get_elem_value(elem, "visibility") or [],
+ testonly=get_elem_value(elem, "testonly") or False)
+
+
+def read_build(package):
+ """Runs bazel query on given package file and returns all cc rules."""
+ result = subprocess.check_output(
+ ["bazel", "query", package + ":all", "--output", "xml"])
+ root = xml.etree.ElementTree.fromstring(result)
+ return [
+ parse_rule(elem, package)
+ for elem in root
+ if elem.tag == "rule" and elem.attrib["class"].startswith("cc_")
+ ]
+
+
+def collect_rules(root_path):
+ """Collects and returns all rules from root path recursively."""
+ rules = []
+ for cur, _, _ in os.walk(root_path):
+ build_path = os.path.join(cur, "BUILD.bazel")
+ if os.path.exists(build_path):
+ rules.extend(read_build("//" + cur))
+ return rules
+
+
+def relevant_rule(rule):
+ """Returns true if a given rule is relevant when generating a podspec."""
+ return (
+ # cc_library only (ignore cc_test, cc_binary)
+ rule.type == "cc_library" and
+ # ignore empty rule
+ (rule.hdrs + rule.textual_hdrs + rule.srcs) and
+ # ignore test-only rule
+ not rule.testonly)
+
+
+def get_spec_var(depth):
+ """Returns the name of variable for spec with given depth."""
+ return "s" if depth == 0 else "s{}".format(depth)
+
+
+def get_spec_name(label):
+ """Converts the label of bazel rule to the name of podspec."""
+ assert label.startswith("//absl/"), "{} doesn't start with //absl/".format(
+ label)
+ # e.g. //absl/apple/banana -> abseil/apple/banana
+ return "abseil/" + label[7:]
+
+
+def write_podspec(f, rules, args):
+ """Writes a podspec from given rules and args."""
+ rule_dir = build_rule_directory(rules)["abseil"]
+ # Write root part with given arguments
+ spec = re.sub(r"\$\{(\w+)\}", lambda x: args[x.group(1)],
+ SPEC_TEMPLATE).lstrip()
+ f.write(spec)
+ # Write all target rules
+ write_podspec_map(f, rule_dir, 0)
+ f.write("end\n")
+
+
+def build_rule_directory(rules):
+ """Builds a tree-style rule directory from given rules."""
+ rule_dir = {}
+ for rule in rules:
+ cur = rule_dir
+ for frag in get_spec_name(rule.package).split("/"):
+ cur = cur.setdefault(frag, {})
+ cur[rule.name] = rule
+ return rule_dir
+
+
+def write_podspec_map(f, cur_map, depth):
+ """Writes podspec from rule map recursively."""
+ for key, value in sorted(cur_map.items()):
+ indent = " " * (depth + 1)
+ f.write("{indent}{var0}.subspec '{key}' do |{var1}|\n".format(
+ indent=indent,
+ key=key,
+ var0=get_spec_var(depth),
+ var1=get_spec_var(depth + 1)))
+ if isinstance(value, dict):
+ write_podspec_map(f, value, depth + 1)
+ else:
+ write_podspec_rule(f, value, depth + 1)
+ f.write("{indent}end\n".format(indent=indent))
+
+
+def write_podspec_rule(f, rule, depth):
+ """Writes podspec from given rule."""
+ indent = " " * (depth + 1)
+ spec_var = get_spec_var(depth)
+ # Puts all files in hdrs, textual_hdrs, and srcs into source_files.
+ # Since CocoaPods treats header_files a bit differently from bazel,
+ # this won't generate a header_files field so that all source_files
+ # are considered as header files.
+ srcs = sorted(set(rule.hdrs + rule.textual_hdrs + rule.srcs))
+ write_indented_list(
+ f, "{indent}{var}.source_files = ".format(indent=indent, var=spec_var),
+ srcs)
+ # Writes dependencies of this rule.
+ for dep in sorted(rule.deps):
+ name = get_spec_name(dep.replace(":", "/"))
+ f.write("{indent}{var}.dependency '{dep}'\n".format(
+ indent=indent, var=spec_var, dep=name))
+
+
+def write_indented_list(f, leading, values):
+ """Writes leading values in an indented style."""
+ f.write(leading)
+ f.write((",\n" + " " * len(leading)).join("'{}'".format(v) for v in values))
+ f.write("\n")
+
+
+def generate(args):
+ """Generates a podspec file from all BUILD files under absl directory."""
+ rules = filter(relevant_rule, collect_rules("absl"))
+ with open(args.output, "wt") as f:
+ write_podspec(f, rules, vars(args))
+
+
+def main():
+ parser = argparse.ArgumentParser(
+ description="Generates abseil.podspec from BUILD.bazel")
+ parser.add_argument(
+ "-v", "--version", help="The version of podspec", required=True)
+ parser.add_argument(
+ "-t",
+ "--tag",
+ default=None,
+ help="The name of git tag (default: version)")
+ parser.add_argument(
+ "-o",
+ "--output",
+ default="abseil.podspec",
+ help="The name of output file (default: abseil.podspec)")
+ args = parser.parse_args()
+ if args.tag is None:
+ args.tag = args.version
+ generate(args)
+
+
+if __name__ == "__main__":
+ main()
diff --git a/third_party/abseil/src/absl/algorithm/BUILD.bazel b/third_party/abseil/src/absl/algorithm/BUILD.bazel
new file mode 100644
index 0000000..a3002b7
--- /dev/null
+++ b/third_party/abseil/src/absl/algorithm/BUILD.bazel
@@ -0,0 +1,91 @@
+#
+# Copyright 2017 The Abseil Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+load("@rules_cc//cc:defs.bzl", "cc_library", "cc_test")
+load(
+ "//absl:copts/configure_copts.bzl",
+ "ABSL_DEFAULT_COPTS",
+ "ABSL_DEFAULT_LINKOPTS",
+ "ABSL_TEST_COPTS",
+)
+
+package(default_visibility = ["//visibility:public"])
+
+licenses(["notice"])
+
+cc_library(
+ name = "algorithm",
+ hdrs = ["algorithm.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ "//absl/base:config",
+ ],
+)
+
+cc_test(
+ name = "algorithm_test",
+ size = "small",
+ srcs = ["algorithm_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":algorithm",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "algorithm_benchmark",
+ srcs = ["equal_benchmark.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ tags = ["benchmark"],
+ deps = [
+ ":algorithm",
+ "//absl/base:core_headers",
+ "@com_github_google_benchmark//:benchmark_main",
+ ],
+)
+
+cc_library(
+ name = "container",
+ hdrs = [
+ "container.h",
+ ],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":algorithm",
+ "//absl/base:core_headers",
+ "//absl/meta:type_traits",
+ ],
+)
+
+cc_test(
+ name = "container_test",
+ srcs = ["container_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":container",
+ "//absl/base",
+ "//absl/base:core_headers",
+ "//absl/memory",
+ "//absl/types:span",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
diff --git a/third_party/abseil/src/absl/algorithm/CMakeLists.txt b/third_party/abseil/src/absl/algorithm/CMakeLists.txt
new file mode 100644
index 0000000..56cd0fb
--- /dev/null
+++ b/third_party/abseil/src/absl/algorithm/CMakeLists.txt
@@ -0,0 +1,69 @@
+#
+# Copyright 2017 The Abseil Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+absl_cc_library(
+ NAME
+ algorithm
+ HDRS
+ "algorithm.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::config
+ PUBLIC
+)
+
+absl_cc_test(
+ NAME
+ algorithm_test
+ SRCS
+ "algorithm_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::algorithm
+ gmock_main
+)
+
+absl_cc_library(
+ NAME
+ algorithm_container
+ HDRS
+ "container.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::algorithm
+ absl::core_headers
+ absl::meta
+ PUBLIC
+)
+
+absl_cc_test(
+ NAME
+ container_test
+ SRCS
+ "container_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::algorithm_container
+ absl::base
+ absl::core_headers
+ absl::memory
+ absl::span
+ gmock_main
+)
diff --git a/third_party/abseil/src/absl/algorithm/algorithm.h b/third_party/abseil/src/absl/algorithm/algorithm.h
new file mode 100644
index 0000000..e9b4733
--- /dev/null
+++ b/third_party/abseil/src/absl/algorithm/algorithm.h
@@ -0,0 +1,159 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: algorithm.h
+// -----------------------------------------------------------------------------
+//
+// This header file contains Google extensions to the standard <algorithm> C++
+// header.
+
+#ifndef ABSL_ALGORITHM_ALGORITHM_H_
+#define ABSL_ALGORITHM_ALGORITHM_H_
+
+#include <algorithm>
+#include <iterator>
+#include <type_traits>
+
+#include "absl/base/config.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+namespace algorithm_internal {
+
+// Performs comparisons with operator==, similar to C++14's `std::equal_to<>`.
+struct EqualTo {
+ template <typename T, typename U>
+ bool operator()(const T& a, const U& b) const {
+ return a == b;
+ }
+};
+
+template <typename InputIter1, typename InputIter2, typename Pred>
+bool EqualImpl(InputIter1 first1, InputIter1 last1, InputIter2 first2,
+ InputIter2 last2, Pred pred, std::input_iterator_tag,
+ std::input_iterator_tag) {
+ while (true) {
+ if (first1 == last1) return first2 == last2;
+ if (first2 == last2) return false;
+ if (!pred(*first1, *first2)) return false;
+ ++first1;
+ ++first2;
+ }
+}
+
+template <typename InputIter1, typename InputIter2, typename Pred>
+bool EqualImpl(InputIter1 first1, InputIter1 last1, InputIter2 first2,
+ InputIter2 last2, Pred&& pred, std::random_access_iterator_tag,
+ std::random_access_iterator_tag) {
+ return (last1 - first1 == last2 - first2) &&
+ std::equal(first1, last1, first2, std::forward<Pred>(pred));
+}
+
+// When we are using our own internal predicate that just applies operator==, we
+// forward to the non-predicate form of std::equal. This enables an optimization
+// in libstdc++ that can result in std::memcmp being used for integer types.
+template <typename InputIter1, typename InputIter2>
+bool EqualImpl(InputIter1 first1, InputIter1 last1, InputIter2 first2,
+ InputIter2 last2, algorithm_internal::EqualTo /* unused */,
+ std::random_access_iterator_tag,
+ std::random_access_iterator_tag) {
+ return (last1 - first1 == last2 - first2) &&
+ std::equal(first1, last1, first2);
+}
+
+template <typename It>
+It RotateImpl(It first, It middle, It last, std::true_type) {
+ return std::rotate(first, middle, last);
+}
+
+template <typename It>
+It RotateImpl(It first, It middle, It last, std::false_type) {
+ std::rotate(first, middle, last);
+ return std::next(first, std::distance(middle, last));
+}
+
+} // namespace algorithm_internal
+
+// equal()
+//
+// Compares the equality of two ranges specified by pairs of iterators, using
+// the given predicate, returning true iff for each corresponding iterator i1
+// and i2 in the first and second range respectively, pred(*i1, *i2) == true
+//
+// This comparison takes at most min(`last1` - `first1`, `last2` - `first2`)
+// invocations of the predicate. Additionally, if InputIter1 and InputIter2 are
+// both random-access iterators, and `last1` - `first1` != `last2` - `first2`,
+// then the predicate is never invoked and the function returns false.
+//
+// This is a C++11-compatible implementation of C++14 `std::equal`. See
+// https://en.cppreference.com/w/cpp/algorithm/equal for more information.
+template <typename InputIter1, typename InputIter2, typename Pred>
+bool equal(InputIter1 first1, InputIter1 last1, InputIter2 first2,
+ InputIter2 last2, Pred&& pred) {
+ return algorithm_internal::EqualImpl(
+ first1, last1, first2, last2, std::forward<Pred>(pred),
+ typename std::iterator_traits<InputIter1>::iterator_category{},
+ typename std::iterator_traits<InputIter2>::iterator_category{});
+}
+
+// Overload of equal() that performs comparison of two ranges specified by pairs
+// of iterators using operator==.
+template <typename InputIter1, typename InputIter2>
+bool equal(InputIter1 first1, InputIter1 last1, InputIter2 first2,
+ InputIter2 last2) {
+ return absl::equal(first1, last1, first2, last2,
+ algorithm_internal::EqualTo{});
+}
+
+// linear_search()
+//
+// Performs a linear search for `value` using the iterator `first` up to
+// but not including `last`, returning true if [`first`, `last`) contains an
+// element equal to `value`.
+//
+// A linear search is of O(n) complexity which is guaranteed to make at most
+// n = (`last` - `first`) comparisons. A linear search over short containers
+// may be faster than a binary search, even when the container is sorted.
+template <typename InputIterator, typename EqualityComparable>
+bool linear_search(InputIterator first, InputIterator last,
+ const EqualityComparable& value) {
+ return std::find(first, last, value) != last;
+}
+
+// rotate()
+//
+// Performs a left rotation on a range of elements (`first`, `last`) such that
+// `middle` is now the first element. `rotate()` returns an iterator pointing to
+// the first element before rotation. This function is exactly the same as
+// `std::rotate`, but fixes a bug in gcc
+// <= 4.9 where `std::rotate` returns `void` instead of an iterator.
+//
+// The complexity of this algorithm is the same as that of `std::rotate`, but if
+// `ForwardIterator` is not a random-access iterator, then `absl::rotate`
+// performs an additional pass over the range to construct the return value.
+template <typename ForwardIterator>
+ForwardIterator rotate(ForwardIterator first, ForwardIterator middle,
+ ForwardIterator last) {
+ return algorithm_internal::RotateImpl(
+ first, middle, last,
+ std::is_same<decltype(std::rotate(first, middle, last)),
+ ForwardIterator>());
+}
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_ALGORITHM_ALGORITHM_H_
diff --git a/third_party/abseil/src/absl/algorithm/algorithm_test.cc b/third_party/abseil/src/absl/algorithm/algorithm_test.cc
new file mode 100644
index 0000000..81fccb6
--- /dev/null
+++ b/third_party/abseil/src/absl/algorithm/algorithm_test.cc
@@ -0,0 +1,182 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/algorithm/algorithm.h"
+
+#include <algorithm>
+#include <list>
+#include <vector>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+
+namespace {
+
+TEST(EqualTest, DefaultComparisonRandomAccess) {
+ std::vector<int> v1{1, 2, 3};
+ std::vector<int> v2 = v1;
+ std::vector<int> v3 = {1, 2};
+ std::vector<int> v4 = {1, 2, 4};
+
+ EXPECT_TRUE(absl::equal(v1.begin(), v1.end(), v2.begin(), v2.end()));
+ EXPECT_FALSE(absl::equal(v1.begin(), v1.end(), v3.begin(), v3.end()));
+ EXPECT_FALSE(absl::equal(v1.begin(), v1.end(), v4.begin(), v4.end()));
+}
+
+TEST(EqualTest, DefaultComparison) {
+ std::list<int> lst1{1, 2, 3};
+ std::list<int> lst2 = lst1;
+ std::list<int> lst3{1, 2};
+ std::list<int> lst4{1, 2, 4};
+
+ EXPECT_TRUE(absl::equal(lst1.begin(), lst1.end(), lst2.begin(), lst2.end()));
+ EXPECT_FALSE(absl::equal(lst1.begin(), lst1.end(), lst3.begin(), lst3.end()));
+ EXPECT_FALSE(absl::equal(lst1.begin(), lst1.end(), lst4.begin(), lst4.end()));
+}
+
+TEST(EqualTest, EmptyRange) {
+ std::vector<int> v1{1, 2, 3};
+ std::vector<int> empty1;
+ std::vector<int> empty2;
+
+ EXPECT_FALSE(absl::equal(v1.begin(), v1.end(), empty1.begin(), empty1.end()));
+ EXPECT_FALSE(absl::equal(empty1.begin(), empty1.end(), v1.begin(), v1.end()));
+ EXPECT_TRUE(
+ absl::equal(empty1.begin(), empty1.end(), empty2.begin(), empty2.end()));
+}
+
+TEST(EqualTest, MixedIterTypes) {
+ std::vector<int> v1{1, 2, 3};
+ std::list<int> lst1{v1.begin(), v1.end()};
+ std::list<int> lst2{1, 2, 4};
+ std::list<int> lst3{1, 2};
+
+ EXPECT_TRUE(absl::equal(v1.begin(), v1.end(), lst1.begin(), lst1.end()));
+ EXPECT_FALSE(absl::equal(v1.begin(), v1.end(), lst2.begin(), lst2.end()));
+ EXPECT_FALSE(absl::equal(v1.begin(), v1.end(), lst3.begin(), lst3.end()));
+}
+
+TEST(EqualTest, MixedValueTypes) {
+ std::vector<int> v1{1, 2, 3};
+ std::vector<char> v2{1, 2, 3};
+ std::vector<char> v3{1, 2};
+ std::vector<char> v4{1, 2, 4};
+
+ EXPECT_TRUE(absl::equal(v1.begin(), v1.end(), v2.begin(), v2.end()));
+ EXPECT_FALSE(absl::equal(v1.begin(), v1.end(), v3.begin(), v3.end()));
+ EXPECT_FALSE(absl::equal(v1.begin(), v1.end(), v4.begin(), v4.end()));
+}
+
+TEST(EqualTest, WeirdIterators) {
+ std::vector<bool> v1{true, false};
+ std::vector<bool> v2 = v1;
+ std::vector<bool> v3{true};
+ std::vector<bool> v4{true, true, true};
+
+ EXPECT_TRUE(absl::equal(v1.begin(), v1.end(), v2.begin(), v2.end()));
+ EXPECT_FALSE(absl::equal(v1.begin(), v1.end(), v3.begin(), v3.end()));
+ EXPECT_FALSE(absl::equal(v1.begin(), v1.end(), v4.begin(), v4.end()));
+}
+
+TEST(EqualTest, CustomComparison) {
+ int n[] = {1, 2, 3, 4};
+ std::vector<int*> v1{&n[0], &n[1], &n[2]};
+ std::vector<int*> v2 = v1;
+ std::vector<int*> v3{&n[0], &n[1], &n[3]};
+ std::vector<int*> v4{&n[0], &n[1]};
+
+ auto eq = [](int* a, int* b) { return *a == *b; };
+
+ EXPECT_TRUE(absl::equal(v1.begin(), v1.end(), v2.begin(), v2.end(), eq));
+ EXPECT_FALSE(absl::equal(v1.begin(), v1.end(), v3.begin(), v3.end(), eq));
+ EXPECT_FALSE(absl::equal(v1.begin(), v1.end(), v4.begin(), v4.end(), eq));
+}
+
+TEST(EqualTest, MoveOnlyPredicate) {
+ std::vector<int> v1{1, 2, 3};
+ std::vector<int> v2{4, 5, 6};
+
+ // move-only equality predicate
+ struct Eq {
+ Eq() = default;
+ Eq(Eq &&) = default;
+ Eq(const Eq &) = delete;
+ Eq &operator=(const Eq &) = delete;
+ bool operator()(const int a, const int b) const { return a == b; }
+ };
+
+ EXPECT_TRUE(absl::equal(v1.begin(), v1.end(), v1.begin(), v1.end(), Eq()));
+ EXPECT_FALSE(absl::equal(v1.begin(), v1.end(), v2.begin(), v2.end(), Eq()));
+}
+
+struct CountingTrivialPred {
+ int* count;
+ bool operator()(int, int) const {
+ ++*count;
+ return true;
+ }
+};
+
+TEST(EqualTest, RandomAccessComplexity) {
+ std::vector<int> v1{1, 1, 3};
+ std::vector<int> v2 = v1;
+ std::vector<int> v3{1, 2};
+
+ do {
+ int count = 0;
+ absl::equal(v1.begin(), v1.end(), v2.begin(), v2.end(),
+ CountingTrivialPred{&count});
+ EXPECT_LE(count, 3);
+ } while (std::next_permutation(v2.begin(), v2.end()));
+
+ int count = 0;
+ absl::equal(v1.begin(), v1.end(), v3.begin(), v3.end(),
+ CountingTrivialPred{&count});
+ EXPECT_EQ(count, 0);
+}
+
+class LinearSearchTest : public testing::Test {
+ protected:
+ LinearSearchTest() : container_{1, 2, 3} {}
+
+ static bool Is3(int n) { return n == 3; }
+ static bool Is4(int n) { return n == 4; }
+
+ std::vector<int> container_;
+};
+
+TEST_F(LinearSearchTest, linear_search) {
+ EXPECT_TRUE(absl::linear_search(container_.begin(), container_.end(), 3));
+ EXPECT_FALSE(absl::linear_search(container_.begin(), container_.end(), 4));
+}
+
+TEST_F(LinearSearchTest, linear_searchConst) {
+ const std::vector<int> *const const_container = &container_;
+ EXPECT_TRUE(
+ absl::linear_search(const_container->begin(), const_container->end(), 3));
+ EXPECT_FALSE(
+ absl::linear_search(const_container->begin(), const_container->end(), 4));
+}
+
+TEST(RotateTest, Rotate) {
+ std::vector<int> v{0, 1, 2, 3, 4};
+ EXPECT_EQ(*absl::rotate(v.begin(), v.begin() + 2, v.end()), 0);
+ EXPECT_THAT(v, testing::ElementsAreArray({2, 3, 4, 0, 1}));
+
+ std::list<int> l{0, 1, 2, 3, 4};
+ EXPECT_EQ(*absl::rotate(l.begin(), std::next(l.begin(), 3), l.end()), 0);
+ EXPECT_THAT(l, testing::ElementsAreArray({3, 4, 0, 1, 2}));
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/algorithm/container.h b/third_party/abseil/src/absl/algorithm/container.h
new file mode 100644
index 0000000..6398438
--- /dev/null
+++ b/third_party/abseil/src/absl/algorithm/container.h
@@ -0,0 +1,1764 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: container.h
+// -----------------------------------------------------------------------------
+//
+// This header file provides Container-based versions of algorithmic functions
+// within the C++ standard library. The following standard library sets of
+// functions are covered within this file:
+//
+// * Algorithmic <iterator> functions
+// * Algorithmic <numeric> functions
+// * <algorithm> functions
+//
+// The standard library functions operate on iterator ranges; the functions
+// within this API operate on containers, though many return iterator ranges.
+//
+// All functions within this API are named with a `c_` prefix. Calls such as
+// `absl::c_xx(container, ...) are equivalent to std:: functions such as
+// `std::xx(std::begin(cont), std::end(cont), ...)`. Functions that act on
+// iterators but not conceptually on iterator ranges (e.g. `std::iter_swap`)
+// have no equivalent here.
+//
+// For template parameter and variable naming, `C` indicates the container type
+// to which the function is applied, `Pred` indicates the predicate object type
+// to be used by the function and `T` indicates the applicable element type.
+
+#ifndef ABSL_ALGORITHM_CONTAINER_H_
+#define ABSL_ALGORITHM_CONTAINER_H_
+
+#include <algorithm>
+#include <cassert>
+#include <iterator>
+#include <numeric>
+#include <type_traits>
+#include <unordered_map>
+#include <unordered_set>
+#include <utility>
+#include <vector>
+
+#include "absl/algorithm/algorithm.h"
+#include "absl/base/macros.h"
+#include "absl/meta/type_traits.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace container_algorithm_internal {
+
+// NOTE: it is important to defer to ADL lookup for building with C++ modules,
+// especially for headers like <valarray> which are not visible from this file
+// but specialize std::begin and std::end.
+using std::begin;
+using std::end;
+
+// The type of the iterator given by begin(c) (possibly std::begin(c)).
+// ContainerIter<const vector<T>> gives vector<T>::const_iterator,
+// while ContainerIter<vector<T>> gives vector<T>::iterator.
+template <typename C>
+using ContainerIter = decltype(begin(std::declval<C&>()));
+
+// An MSVC bug involving template parameter substitution requires us to use
+// decltype() here instead of just std::pair.
+template <typename C1, typename C2>
+using ContainerIterPairType =
+ decltype(std::make_pair(ContainerIter<C1>(), ContainerIter<C2>()));
+
+template <typename C>
+using ContainerDifferenceType =
+ decltype(std::distance(std::declval<ContainerIter<C>>(),
+ std::declval<ContainerIter<C>>()));
+
+template <typename C>
+using ContainerPointerType =
+ typename std::iterator_traits<ContainerIter<C>>::pointer;
+
+// container_algorithm_internal::c_begin and
+// container_algorithm_internal::c_end are abbreviations for proper ADL
+// lookup of std::begin and std::end, i.e.
+// using std::begin;
+// using std::end;
+// std::foo(begin(c), end(c));
+// becomes
+// std::foo(container_algorithm_internal::begin(c),
+// container_algorithm_internal::end(c));
+// These are meant for internal use only.
+
+template <typename C>
+ContainerIter<C> c_begin(C& c) { return begin(c); }
+
+template <typename C>
+ContainerIter<C> c_end(C& c) { return end(c); }
+
+template <typename T>
+struct IsUnorderedContainer : std::false_type {};
+
+template <class Key, class T, class Hash, class KeyEqual, class Allocator>
+struct IsUnorderedContainer<
+ std::unordered_map<Key, T, Hash, KeyEqual, Allocator>> : std::true_type {};
+
+template <class Key, class Hash, class KeyEqual, class Allocator>
+struct IsUnorderedContainer<std::unordered_set<Key, Hash, KeyEqual, Allocator>>
+ : std::true_type {};
+
+// container_algorithm_internal::c_size. It is meant for internal use only.
+
+template <class C>
+auto c_size(C& c) -> decltype(c.size()) {
+ return c.size();
+}
+
+template <class T, std::size_t N>
+constexpr std::size_t c_size(T (&)[N]) {
+ return N;
+}
+
+} // namespace container_algorithm_internal
+
+// PUBLIC API
+
+//------------------------------------------------------------------------------
+// Abseil algorithm.h functions
+//------------------------------------------------------------------------------
+
+// c_linear_search()
+//
+// Container-based version of absl::linear_search() for performing a linear
+// search within a container.
+template <typename C, typename EqualityComparable>
+bool c_linear_search(const C& c, EqualityComparable&& value) {
+ return linear_search(container_algorithm_internal::c_begin(c),
+ container_algorithm_internal::c_end(c),
+ std::forward<EqualityComparable>(value));
+}
+
+//------------------------------------------------------------------------------
+// <iterator> algorithms
+//------------------------------------------------------------------------------
+
+// c_distance()
+//
+// Container-based version of the <iterator> `std::distance()` function to
+// return the number of elements within a container.
+template <typename C>
+container_algorithm_internal::ContainerDifferenceType<const C> c_distance(
+ const C& c) {
+ return std::distance(container_algorithm_internal::c_begin(c),
+ container_algorithm_internal::c_end(c));
+}
+
+//------------------------------------------------------------------------------
+// <algorithm> Non-modifying sequence operations
+//------------------------------------------------------------------------------
+
+// c_all_of()
+//
+// Container-based version of the <algorithm> `std::all_of()` function to
+// test a condition on all elements within a container.
+template <typename C, typename Pred>
+bool c_all_of(const C& c, Pred&& pred) {
+ return std::all_of(container_algorithm_internal::c_begin(c),
+ container_algorithm_internal::c_end(c),
+ std::forward<Pred>(pred));
+}
+
+// c_any_of()
+//
+// Container-based version of the <algorithm> `std::any_of()` function to
+// test if any element in a container fulfills a condition.
+template <typename C, typename Pred>
+bool c_any_of(const C& c, Pred&& pred) {
+ return std::any_of(container_algorithm_internal::c_begin(c),
+ container_algorithm_internal::c_end(c),
+ std::forward<Pred>(pred));
+}
+
+// c_none_of()
+//
+// Container-based version of the <algorithm> `std::none_of()` function to
+// test if no elements in a container fulfill a condition.
+template <typename C, typename Pred>
+bool c_none_of(const C& c, Pred&& pred) {
+ return std::none_of(container_algorithm_internal::c_begin(c),
+ container_algorithm_internal::c_end(c),
+ std::forward<Pred>(pred));
+}
+
+// c_for_each()
+//
+// Container-based version of the <algorithm> `std::for_each()` function to
+// apply a function to a container's elements.
+template <typename C, typename Function>
+decay_t<Function> c_for_each(C&& c, Function&& f) {
+ return std::for_each(container_algorithm_internal::c_begin(c),
+ container_algorithm_internal::c_end(c),
+ std::forward<Function>(f));
+}
+
+// c_find()
+//
+// Container-based version of the <algorithm> `std::find()` function to find
+// the first element containing the passed value within a container value.
+template <typename C, typename T>
+container_algorithm_internal::ContainerIter<C> c_find(C& c, T&& value) {
+ return std::find(container_algorithm_internal::c_begin(c),
+ container_algorithm_internal::c_end(c),
+ std::forward<T>(value));
+}
+
+// c_find_if()
+//
+// Container-based version of the <algorithm> `std::find_if()` function to find
+// the first element in a container matching the given condition.
+template <typename C, typename Pred>
+container_algorithm_internal::ContainerIter<C> c_find_if(C& c, Pred&& pred) {
+ return std::find_if(container_algorithm_internal::c_begin(c),
+ container_algorithm_internal::c_end(c),
+ std::forward<Pred>(pred));
+}
+
+// c_find_if_not()
+//
+// Container-based version of the <algorithm> `std::find_if_not()` function to
+// find the first element in a container not matching the given condition.
+template <typename C, typename Pred>
+container_algorithm_internal::ContainerIter<C> c_find_if_not(C& c,
+ Pred&& pred) {
+ return std::find_if_not(container_algorithm_internal::c_begin(c),
+ container_algorithm_internal::c_end(c),
+ std::forward<Pred>(pred));
+}
+
+// c_find_end()
+//
+// Container-based version of the <algorithm> `std::find_end()` function to
+// find the last subsequence within a container.
+template <typename Sequence1, typename Sequence2>
+container_algorithm_internal::ContainerIter<Sequence1> c_find_end(
+ Sequence1& sequence, Sequence2& subsequence) {
+ return std::find_end(container_algorithm_internal::c_begin(sequence),
+ container_algorithm_internal::c_end(sequence),
+ container_algorithm_internal::c_begin(subsequence),
+ container_algorithm_internal::c_end(subsequence));
+}
+
+// Overload of c_find_end() for using a predicate evaluation other than `==` as
+// the function's test condition.
+template <typename Sequence1, typename Sequence2, typename BinaryPredicate>
+container_algorithm_internal::ContainerIter<Sequence1> c_find_end(
+ Sequence1& sequence, Sequence2& subsequence, BinaryPredicate&& pred) {
+ return std::find_end(container_algorithm_internal::c_begin(sequence),
+ container_algorithm_internal::c_end(sequence),
+ container_algorithm_internal::c_begin(subsequence),
+ container_algorithm_internal::c_end(subsequence),
+ std::forward<BinaryPredicate>(pred));
+}
+
+// c_find_first_of()
+//
+// Container-based version of the <algorithm> `std::find_first_of()` function to
+// find the first element within the container that is also within the options
+// container.
+template <typename C1, typename C2>
+container_algorithm_internal::ContainerIter<C1> c_find_first_of(C1& container,
+ C2& options) {
+ return std::find_first_of(container_algorithm_internal::c_begin(container),
+ container_algorithm_internal::c_end(container),
+ container_algorithm_internal::c_begin(options),
+ container_algorithm_internal::c_end(options));
+}
+
+// Overload of c_find_first_of() for using a predicate evaluation other than
+// `==` as the function's test condition.
+template <typename C1, typename C2, typename BinaryPredicate>
+container_algorithm_internal::ContainerIter<C1> c_find_first_of(
+ C1& container, C2& options, BinaryPredicate&& pred) {
+ return std::find_first_of(container_algorithm_internal::c_begin(container),
+ container_algorithm_internal::c_end(container),
+ container_algorithm_internal::c_begin(options),
+ container_algorithm_internal::c_end(options),
+ std::forward<BinaryPredicate>(pred));
+}
+
+// c_adjacent_find()
+//
+// Container-based version of the <algorithm> `std::adjacent_find()` function to
+// find equal adjacent elements within a container.
+template <typename Sequence>
+container_algorithm_internal::ContainerIter<Sequence> c_adjacent_find(
+ Sequence& sequence) {
+ return std::adjacent_find(container_algorithm_internal::c_begin(sequence),
+ container_algorithm_internal::c_end(sequence));
+}
+
+// Overload of c_adjacent_find() for using a predicate evaluation other than
+// `==` as the function's test condition.
+template <typename Sequence, typename BinaryPredicate>
+container_algorithm_internal::ContainerIter<Sequence> c_adjacent_find(
+ Sequence& sequence, BinaryPredicate&& pred) {
+ return std::adjacent_find(container_algorithm_internal::c_begin(sequence),
+ container_algorithm_internal::c_end(sequence),
+ std::forward<BinaryPredicate>(pred));
+}
+
+// c_count()
+//
+// Container-based version of the <algorithm> `std::count()` function to count
+// values that match within a container.
+template <typename C, typename T>
+container_algorithm_internal::ContainerDifferenceType<const C> c_count(
+ const C& c, T&& value) {
+ return std::count(container_algorithm_internal::c_begin(c),
+ container_algorithm_internal::c_end(c),
+ std::forward<T>(value));
+}
+
+// c_count_if()
+//
+// Container-based version of the <algorithm> `std::count_if()` function to
+// count values matching a condition within a container.
+template <typename C, typename Pred>
+container_algorithm_internal::ContainerDifferenceType<const C> c_count_if(
+ const C& c, Pred&& pred) {
+ return std::count_if(container_algorithm_internal::c_begin(c),
+ container_algorithm_internal::c_end(c),
+ std::forward<Pred>(pred));
+}
+
+// c_mismatch()
+//
+// Container-based version of the <algorithm> `std::mismatch()` function to
+// return the first element where two ordered containers differ. Applies `==` to
+// the first N elements of `c1` and `c2`, where N = min(size(c1), size(c2)).
+template <typename C1, typename C2>
+container_algorithm_internal::ContainerIterPairType<C1, C2>
+c_mismatch(C1& c1, C2& c2) {
+ auto first1 = container_algorithm_internal::c_begin(c1);
+ auto last1 = container_algorithm_internal::c_end(c1);
+ auto first2 = container_algorithm_internal::c_begin(c2);
+ auto last2 = container_algorithm_internal::c_end(c2);
+
+ for (; first1 != last1 && first2 != last2; ++first1, (void)++first2) {
+ // Negates equality because Cpp17EqualityComparable doesn't require clients
+ // to overload both `operator==` and `operator!=`.
+ if (!(*first1 == *first2)) {
+ break;
+ }
+ }
+
+ return std::make_pair(first1, first2);
+}
+
+// Overload of c_mismatch() for using a predicate evaluation other than `==` as
+// the function's test condition. Applies `pred`to the first N elements of `c1`
+// and `c2`, where N = min(size(c1), size(c2)).
+template <typename C1, typename C2, typename BinaryPredicate>
+container_algorithm_internal::ContainerIterPairType<C1, C2>
+c_mismatch(C1& c1, C2& c2, BinaryPredicate pred) {
+ auto first1 = container_algorithm_internal::c_begin(c1);
+ auto last1 = container_algorithm_internal::c_end(c1);
+ auto first2 = container_algorithm_internal::c_begin(c2);
+ auto last2 = container_algorithm_internal::c_end(c2);
+
+ for (; first1 != last1 && first2 != last2; ++first1, (void)++first2) {
+ if (!pred(*first1, *first2)) {
+ break;
+ }
+ }
+
+ return std::make_pair(first1, first2);
+}
+
+// c_equal()
+//
+// Container-based version of the <algorithm> `std::equal()` function to
+// test whether two containers are equal.
+//
+// NOTE: the semantics of c_equal() are slightly different than those of
+// equal(): while the latter iterates over the second container only up to the
+// size of the first container, c_equal() also checks whether the container
+// sizes are equal. This better matches expectations about c_equal() based on
+// its signature.
+//
+// Example:
+// vector v1 = <1, 2, 3>;
+// vector v2 = <1, 2, 3, 4>;
+// equal(std::begin(v1), std::end(v1), std::begin(v2)) returns true
+// c_equal(v1, v2) returns false
+
+template <typename C1, typename C2>
+bool c_equal(const C1& c1, const C2& c2) {
+ return ((container_algorithm_internal::c_size(c1) ==
+ container_algorithm_internal::c_size(c2)) &&
+ std::equal(container_algorithm_internal::c_begin(c1),
+ container_algorithm_internal::c_end(c1),
+ container_algorithm_internal::c_begin(c2)));
+}
+
+// Overload of c_equal() for using a predicate evaluation other than `==` as
+// the function's test condition.
+template <typename C1, typename C2, typename BinaryPredicate>
+bool c_equal(const C1& c1, const C2& c2, BinaryPredicate&& pred) {
+ return ((container_algorithm_internal::c_size(c1) ==
+ container_algorithm_internal::c_size(c2)) &&
+ std::equal(container_algorithm_internal::c_begin(c1),
+ container_algorithm_internal::c_end(c1),
+ container_algorithm_internal::c_begin(c2),
+ std::forward<BinaryPredicate>(pred)));
+}
+
+// c_is_permutation()
+//
+// Container-based version of the <algorithm> `std::is_permutation()` function
+// to test whether a container is a permutation of another.
+template <typename C1, typename C2>
+bool c_is_permutation(const C1& c1, const C2& c2) {
+ using std::begin;
+ using std::end;
+ return c1.size() == c2.size() &&
+ std::is_permutation(begin(c1), end(c1), begin(c2));
+}
+
+// Overload of c_is_permutation() for using a predicate evaluation other than
+// `==` as the function's test condition.
+template <typename C1, typename C2, typename BinaryPredicate>
+bool c_is_permutation(const C1& c1, const C2& c2, BinaryPredicate&& pred) {
+ using std::begin;
+ using std::end;
+ return c1.size() == c2.size() &&
+ std::is_permutation(begin(c1), end(c1), begin(c2),
+ std::forward<BinaryPredicate>(pred));
+}
+
+// c_search()
+//
+// Container-based version of the <algorithm> `std::search()` function to search
+// a container for a subsequence.
+template <typename Sequence1, typename Sequence2>
+container_algorithm_internal::ContainerIter<Sequence1> c_search(
+ Sequence1& sequence, Sequence2& subsequence) {
+ return std::search(container_algorithm_internal::c_begin(sequence),
+ container_algorithm_internal::c_end(sequence),
+ container_algorithm_internal::c_begin(subsequence),
+ container_algorithm_internal::c_end(subsequence));
+}
+
+// Overload of c_search() for using a predicate evaluation other than
+// `==` as the function's test condition.
+template <typename Sequence1, typename Sequence2, typename BinaryPredicate>
+container_algorithm_internal::ContainerIter<Sequence1> c_search(
+ Sequence1& sequence, Sequence2& subsequence, BinaryPredicate&& pred) {
+ return std::search(container_algorithm_internal::c_begin(sequence),
+ container_algorithm_internal::c_end(sequence),
+ container_algorithm_internal::c_begin(subsequence),
+ container_algorithm_internal::c_end(subsequence),
+ std::forward<BinaryPredicate>(pred));
+}
+
+// c_search_n()
+//
+// Container-based version of the <algorithm> `std::search_n()` function to
+// search a container for the first sequence of N elements.
+template <typename Sequence, typename Size, typename T>
+container_algorithm_internal::ContainerIter<Sequence> c_search_n(
+ Sequence& sequence, Size count, T&& value) {
+ return std::search_n(container_algorithm_internal::c_begin(sequence),
+ container_algorithm_internal::c_end(sequence), count,
+ std::forward<T>(value));
+}
+
+// Overload of c_search_n() for using a predicate evaluation other than
+// `==` as the function's test condition.
+template <typename Sequence, typename Size, typename T,
+ typename BinaryPredicate>
+container_algorithm_internal::ContainerIter<Sequence> c_search_n(
+ Sequence& sequence, Size count, T&& value, BinaryPredicate&& pred) {
+ return std::search_n(container_algorithm_internal::c_begin(sequence),
+ container_algorithm_internal::c_end(sequence), count,
+ std::forward<T>(value),
+ std::forward<BinaryPredicate>(pred));
+}
+
+//------------------------------------------------------------------------------
+// <algorithm> Modifying sequence operations
+//------------------------------------------------------------------------------
+
+// c_copy()
+//
+// Container-based version of the <algorithm> `std::copy()` function to copy a
+// container's elements into an iterator.
+template <typename InputSequence, typename OutputIterator>
+OutputIterator c_copy(const InputSequence& input, OutputIterator output) {
+ return std::copy(container_algorithm_internal::c_begin(input),
+ container_algorithm_internal::c_end(input), output);
+}
+
+// c_copy_n()
+//
+// Container-based version of the <algorithm> `std::copy_n()` function to copy a
+// container's first N elements into an iterator.
+template <typename C, typename Size, typename OutputIterator>
+OutputIterator c_copy_n(const C& input, Size n, OutputIterator output) {
+ return std::copy_n(container_algorithm_internal::c_begin(input), n, output);
+}
+
+// c_copy_if()
+//
+// Container-based version of the <algorithm> `std::copy_if()` function to copy
+// a container's elements satisfying some condition into an iterator.
+template <typename InputSequence, typename OutputIterator, typename Pred>
+OutputIterator c_copy_if(const InputSequence& input, OutputIterator output,
+ Pred&& pred) {
+ return std::copy_if(container_algorithm_internal::c_begin(input),
+ container_algorithm_internal::c_end(input), output,
+ std::forward<Pred>(pred));
+}
+
+// c_copy_backward()
+//
+// Container-based version of the <algorithm> `std::copy_backward()` function to
+// copy a container's elements in reverse order into an iterator.
+template <typename C, typename BidirectionalIterator>
+BidirectionalIterator c_copy_backward(const C& src,
+ BidirectionalIterator dest) {
+ return std::copy_backward(container_algorithm_internal::c_begin(src),
+ container_algorithm_internal::c_end(src), dest);
+}
+
+// c_move()
+//
+// Container-based version of the <algorithm> `std::move()` function to move
+// a container's elements into an iterator.
+template <typename C, typename OutputIterator>
+OutputIterator c_move(C&& src, OutputIterator dest) {
+ return std::move(container_algorithm_internal::c_begin(src),
+ container_algorithm_internal::c_end(src), dest);
+}
+
+// c_move_backward()
+//
+// Container-based version of the <algorithm> `std::move_backward()` function to
+// move a container's elements into an iterator in reverse order.
+template <typename C, typename BidirectionalIterator>
+BidirectionalIterator c_move_backward(C&& src, BidirectionalIterator dest) {
+ return std::move_backward(container_algorithm_internal::c_begin(src),
+ container_algorithm_internal::c_end(src), dest);
+}
+
+// c_swap_ranges()
+//
+// Container-based version of the <algorithm> `std::swap_ranges()` function to
+// swap a container's elements with another container's elements. Swaps the
+// first N elements of `c1` and `c2`, where N = min(size(c1), size(c2)).
+template <typename C1, typename C2>
+container_algorithm_internal::ContainerIter<C2> c_swap_ranges(C1& c1, C2& c2) {
+ auto first1 = container_algorithm_internal::c_begin(c1);
+ auto last1 = container_algorithm_internal::c_end(c1);
+ auto first2 = container_algorithm_internal::c_begin(c2);
+ auto last2 = container_algorithm_internal::c_end(c2);
+
+ using std::swap;
+ for (; first1 != last1 && first2 != last2; ++first1, (void)++first2) {
+ swap(*first1, *first2);
+ }
+ return first2;
+}
+
+// c_transform()
+//
+// Container-based version of the <algorithm> `std::transform()` function to
+// transform a container's elements using the unary operation, storing the
+// result in an iterator pointing to the last transformed element in the output
+// range.
+template <typename InputSequence, typename OutputIterator, typename UnaryOp>
+OutputIterator c_transform(const InputSequence& input, OutputIterator output,
+ UnaryOp&& unary_op) {
+ return std::transform(container_algorithm_internal::c_begin(input),
+ container_algorithm_internal::c_end(input), output,
+ std::forward<UnaryOp>(unary_op));
+}
+
+// Overload of c_transform() for performing a transformation using a binary
+// predicate. Applies `binary_op` to the first N elements of `c1` and `c2`,
+// where N = min(size(c1), size(c2)).
+template <typename InputSequence1, typename InputSequence2,
+ typename OutputIterator, typename BinaryOp>
+OutputIterator c_transform(const InputSequence1& input1,
+ const InputSequence2& input2, OutputIterator output,
+ BinaryOp&& binary_op) {
+ auto first1 = container_algorithm_internal::c_begin(input1);
+ auto last1 = container_algorithm_internal::c_end(input1);
+ auto first2 = container_algorithm_internal::c_begin(input2);
+ auto last2 = container_algorithm_internal::c_end(input2);
+ for (; first1 != last1 && first2 != last2;
+ ++first1, (void)++first2, ++output) {
+ *output = binary_op(*first1, *first2);
+ }
+
+ return output;
+}
+
+// c_replace()
+//
+// Container-based version of the <algorithm> `std::replace()` function to
+// replace a container's elements of some value with a new value. The container
+// is modified in place.
+template <typename Sequence, typename T>
+void c_replace(Sequence& sequence, const T& old_value, const T& new_value) {
+ std::replace(container_algorithm_internal::c_begin(sequence),
+ container_algorithm_internal::c_end(sequence), old_value,
+ new_value);
+}
+
+// c_replace_if()
+//
+// Container-based version of the <algorithm> `std::replace_if()` function to
+// replace a container's elements of some value with a new value based on some
+// condition. The container is modified in place.
+template <typename C, typename Pred, typename T>
+void c_replace_if(C& c, Pred&& pred, T&& new_value) {
+ std::replace_if(container_algorithm_internal::c_begin(c),
+ container_algorithm_internal::c_end(c),
+ std::forward<Pred>(pred), std::forward<T>(new_value));
+}
+
+// c_replace_copy()
+//
+// Container-based version of the <algorithm> `std::replace_copy()` function to
+// replace a container's elements of some value with a new value and return the
+// results within an iterator.
+template <typename C, typename OutputIterator, typename T>
+OutputIterator c_replace_copy(const C& c, OutputIterator result, T&& old_value,
+ T&& new_value) {
+ return std::replace_copy(container_algorithm_internal::c_begin(c),
+ container_algorithm_internal::c_end(c), result,
+ std::forward<T>(old_value),
+ std::forward<T>(new_value));
+}
+
+// c_replace_copy_if()
+//
+// Container-based version of the <algorithm> `std::replace_copy_if()` function
+// to replace a container's elements of some value with a new value based on
+// some condition, and return the results within an iterator.
+template <typename C, typename OutputIterator, typename Pred, typename T>
+OutputIterator c_replace_copy_if(const C& c, OutputIterator result, Pred&& pred,
+ T&& new_value) {
+ return std::replace_copy_if(container_algorithm_internal::c_begin(c),
+ container_algorithm_internal::c_end(c), result,
+ std::forward<Pred>(pred),
+ std::forward<T>(new_value));
+}
+
+// c_fill()
+//
+// Container-based version of the <algorithm> `std::fill()` function to fill a
+// container with some value.
+template <typename C, typename T>
+void c_fill(C& c, T&& value) {
+ std::fill(container_algorithm_internal::c_begin(c),
+ container_algorithm_internal::c_end(c), std::forward<T>(value));
+}
+
+// c_fill_n()
+//
+// Container-based version of the <algorithm> `std::fill_n()` function to fill
+// the first N elements in a container with some value.
+template <typename C, typename Size, typename T>
+void c_fill_n(C& c, Size n, T&& value) {
+ std::fill_n(container_algorithm_internal::c_begin(c), n,
+ std::forward<T>(value));
+}
+
+// c_generate()
+//
+// Container-based version of the <algorithm> `std::generate()` function to
+// assign a container's elements to the values provided by the given generator.
+template <typename C, typename Generator>
+void c_generate(C& c, Generator&& gen) {
+ std::generate(container_algorithm_internal::c_begin(c),
+ container_algorithm_internal::c_end(c),
+ std::forward<Generator>(gen));
+}
+
+// c_generate_n()
+//
+// Container-based version of the <algorithm> `std::generate_n()` function to
+// assign a container's first N elements to the values provided by the given
+// generator.
+template <typename C, typename Size, typename Generator>
+container_algorithm_internal::ContainerIter<C> c_generate_n(C& c, Size n,
+ Generator&& gen) {
+ return std::generate_n(container_algorithm_internal::c_begin(c), n,
+ std::forward<Generator>(gen));
+}
+
+// Note: `c_xx()` <algorithm> container versions for `remove()`, `remove_if()`,
+// and `unique()` are omitted, because it's not clear whether or not such
+// functions should call erase on their supplied sequences afterwards. Either
+// behavior would be surprising for a different set of users.
+
+// c_remove_copy()
+//
+// Container-based version of the <algorithm> `std::remove_copy()` function to
+// copy a container's elements while removing any elements matching the given
+// `value`.
+template <typename C, typename OutputIterator, typename T>
+OutputIterator c_remove_copy(const C& c, OutputIterator result, T&& value) {
+ return std::remove_copy(container_algorithm_internal::c_begin(c),
+ container_algorithm_internal::c_end(c), result,
+ std::forward<T>(value));
+}
+
+// c_remove_copy_if()
+//
+// Container-based version of the <algorithm> `std::remove_copy_if()` function
+// to copy a container's elements while removing any elements matching the given
+// condition.
+template <typename C, typename OutputIterator, typename Pred>
+OutputIterator c_remove_copy_if(const C& c, OutputIterator result,
+ Pred&& pred) {
+ return std::remove_copy_if(container_algorithm_internal::c_begin(c),
+ container_algorithm_internal::c_end(c), result,
+ std::forward<Pred>(pred));
+}
+
+// c_unique_copy()
+//
+// Container-based version of the <algorithm> `std::unique_copy()` function to
+// copy a container's elements while removing any elements containing duplicate
+// values.
+template <typename C, typename OutputIterator>
+OutputIterator c_unique_copy(const C& c, OutputIterator result) {
+ return std::unique_copy(container_algorithm_internal::c_begin(c),
+ container_algorithm_internal::c_end(c), result);
+}
+
+// Overload of c_unique_copy() for using a predicate evaluation other than
+// `==` for comparing uniqueness of the element values.
+template <typename C, typename OutputIterator, typename BinaryPredicate>
+OutputIterator c_unique_copy(const C& c, OutputIterator result,
+ BinaryPredicate&& pred) {
+ return std::unique_copy(container_algorithm_internal::c_begin(c),
+ container_algorithm_internal::c_end(c), result,
+ std::forward<BinaryPredicate>(pred));
+}
+
+// c_reverse()
+//
+// Container-based version of the <algorithm> `std::reverse()` function to
+// reverse a container's elements.
+template <typename Sequence>
+void c_reverse(Sequence& sequence) {
+ std::reverse(container_algorithm_internal::c_begin(sequence),
+ container_algorithm_internal::c_end(sequence));
+}
+
+// c_reverse_copy()
+//
+// Container-based version of the <algorithm> `std::reverse()` function to
+// reverse a container's elements and write them to an iterator range.
+template <typename C, typename OutputIterator>
+OutputIterator c_reverse_copy(const C& sequence, OutputIterator result) {
+ return std::reverse_copy(container_algorithm_internal::c_begin(sequence),
+ container_algorithm_internal::c_end(sequence),
+ result);
+}
+
+// c_rotate()
+//
+// Container-based version of the <algorithm> `std::rotate()` function to
+// shift a container's elements leftward such that the `middle` element becomes
+// the first element in the container.
+template <typename C,
+ typename Iterator = container_algorithm_internal::ContainerIter<C>>
+Iterator c_rotate(C& sequence, Iterator middle) {
+ return absl::rotate(container_algorithm_internal::c_begin(sequence), middle,
+ container_algorithm_internal::c_end(sequence));
+}
+
+// c_rotate_copy()
+//
+// Container-based version of the <algorithm> `std::rotate_copy()` function to
+// shift a container's elements leftward such that the `middle` element becomes
+// the first element in a new iterator range.
+template <typename C, typename OutputIterator>
+OutputIterator c_rotate_copy(
+ const C& sequence,
+ container_algorithm_internal::ContainerIter<const C> middle,
+ OutputIterator result) {
+ return std::rotate_copy(container_algorithm_internal::c_begin(sequence),
+ middle, container_algorithm_internal::c_end(sequence),
+ result);
+}
+
+// c_shuffle()
+//
+// Container-based version of the <algorithm> `std::shuffle()` function to
+// randomly shuffle elements within the container using a `gen()` uniform random
+// number generator.
+template <typename RandomAccessContainer, typename UniformRandomBitGenerator>
+void c_shuffle(RandomAccessContainer& c, UniformRandomBitGenerator&& gen) {
+ std::shuffle(container_algorithm_internal::c_begin(c),
+ container_algorithm_internal::c_end(c),
+ std::forward<UniformRandomBitGenerator>(gen));
+}
+
+//------------------------------------------------------------------------------
+// <algorithm> Partition functions
+//------------------------------------------------------------------------------
+
+// c_is_partitioned()
+//
+// Container-based version of the <algorithm> `std::is_partitioned()` function
+// to test whether all elements in the container for which `pred` returns `true`
+// precede those for which `pred` is `false`.
+template <typename C, typename Pred>
+bool c_is_partitioned(const C& c, Pred&& pred) {
+ return std::is_partitioned(container_algorithm_internal::c_begin(c),
+ container_algorithm_internal::c_end(c),
+ std::forward<Pred>(pred));
+}
+
+// c_partition()
+//
+// Container-based version of the <algorithm> `std::partition()` function
+// to rearrange all elements in a container in such a way that all elements for
+// which `pred` returns `true` precede all those for which it returns `false`,
+// returning an iterator to the first element of the second group.
+template <typename C, typename Pred>
+container_algorithm_internal::ContainerIter<C> c_partition(C& c, Pred&& pred) {
+ return std::partition(container_algorithm_internal::c_begin(c),
+ container_algorithm_internal::c_end(c),
+ std::forward<Pred>(pred));
+}
+
+// c_stable_partition()
+//
+// Container-based version of the <algorithm> `std::stable_partition()` function
+// to rearrange all elements in a container in such a way that all elements for
+// which `pred` returns `true` precede all those for which it returns `false`,
+// preserving the relative ordering between the two groups. The function returns
+// an iterator to the first element of the second group.
+template <typename C, typename Pred>
+container_algorithm_internal::ContainerIter<C> c_stable_partition(C& c,
+ Pred&& pred) {
+ return std::stable_partition(container_algorithm_internal::c_begin(c),
+ container_algorithm_internal::c_end(c),
+ std::forward<Pred>(pred));
+}
+
+// c_partition_copy()
+//
+// Container-based version of the <algorithm> `std::partition_copy()` function
+// to partition a container's elements and return them into two iterators: one
+// for which `pred` returns `true`, and one for which `pred` returns `false.`
+
+template <typename C, typename OutputIterator1, typename OutputIterator2,
+ typename Pred>
+std::pair<OutputIterator1, OutputIterator2> c_partition_copy(
+ const C& c, OutputIterator1 out_true, OutputIterator2 out_false,
+ Pred&& pred) {
+ return std::partition_copy(container_algorithm_internal::c_begin(c),
+ container_algorithm_internal::c_end(c), out_true,
+ out_false, std::forward<Pred>(pred));
+}
+
+// c_partition_point()
+//
+// Container-based version of the <algorithm> `std::partition_point()` function
+// to return the first element of an already partitioned container for which
+// the given `pred` is not `true`.
+template <typename C, typename Pred>
+container_algorithm_internal::ContainerIter<C> c_partition_point(C& c,
+ Pred&& pred) {
+ return std::partition_point(container_algorithm_internal::c_begin(c),
+ container_algorithm_internal::c_end(c),
+ std::forward<Pred>(pred));
+}
+
+//------------------------------------------------------------------------------
+// <algorithm> Sorting functions
+//------------------------------------------------------------------------------
+
+// c_sort()
+//
+// Container-based version of the <algorithm> `std::sort()` function
+// to sort elements in ascending order of their values.
+template <typename C>
+void c_sort(C& c) {
+ std::sort(container_algorithm_internal::c_begin(c),
+ container_algorithm_internal::c_end(c));
+}
+
+// Overload of c_sort() for performing a `comp` comparison other than the
+// default `operator<`.
+template <typename C, typename Compare>
+void c_sort(C& c, Compare&& comp) {
+ std::sort(container_algorithm_internal::c_begin(c),
+ container_algorithm_internal::c_end(c),
+ std::forward<Compare>(comp));
+}
+
+// c_stable_sort()
+//
+// Container-based version of the <algorithm> `std::stable_sort()` function
+// to sort elements in ascending order of their values, preserving the order
+// of equivalents.
+template <typename C>
+void c_stable_sort(C& c) {
+ std::stable_sort(container_algorithm_internal::c_begin(c),
+ container_algorithm_internal::c_end(c));
+}
+
+// Overload of c_stable_sort() for performing a `comp` comparison other than the
+// default `operator<`.
+template <typename C, typename Compare>
+void c_stable_sort(C& c, Compare&& comp) {
+ std::stable_sort(container_algorithm_internal::c_begin(c),
+ container_algorithm_internal::c_end(c),
+ std::forward<Compare>(comp));
+}
+
+// c_is_sorted()
+//
+// Container-based version of the <algorithm> `std::is_sorted()` function
+// to evaluate whether the given container is sorted in ascending order.
+template <typename C>
+bool c_is_sorted(const C& c) {
+ return std::is_sorted(container_algorithm_internal::c_begin(c),
+ container_algorithm_internal::c_end(c));
+}
+
+// c_is_sorted() overload for performing a `comp` comparison other than the
+// default `operator<`.
+template <typename C, typename Compare>
+bool c_is_sorted(const C& c, Compare&& comp) {
+ return std::is_sorted(container_algorithm_internal::c_begin(c),
+ container_algorithm_internal::c_end(c),
+ std::forward<Compare>(comp));
+}
+
+// c_partial_sort()
+//
+// Container-based version of the <algorithm> `std::partial_sort()` function
+// to rearrange elements within a container such that elements before `middle`
+// are sorted in ascending order.
+template <typename RandomAccessContainer>
+void c_partial_sort(
+ RandomAccessContainer& sequence,
+ container_algorithm_internal::ContainerIter<RandomAccessContainer> middle) {
+ std::partial_sort(container_algorithm_internal::c_begin(sequence), middle,
+ container_algorithm_internal::c_end(sequence));
+}
+
+// Overload of c_partial_sort() for performing a `comp` comparison other than
+// the default `operator<`.
+template <typename RandomAccessContainer, typename Compare>
+void c_partial_sort(
+ RandomAccessContainer& sequence,
+ container_algorithm_internal::ContainerIter<RandomAccessContainer> middle,
+ Compare&& comp) {
+ std::partial_sort(container_algorithm_internal::c_begin(sequence), middle,
+ container_algorithm_internal::c_end(sequence),
+ std::forward<Compare>(comp));
+}
+
+// c_partial_sort_copy()
+//
+// Container-based version of the <algorithm> `std::partial_sort_copy()`
+// function to sort the elements in the given range `result` within the larger
+// `sequence` in ascending order (and using `result` as the output parameter).
+// At most min(result.last - result.first, sequence.last - sequence.first)
+// elements from the sequence will be stored in the result.
+template <typename C, typename RandomAccessContainer>
+container_algorithm_internal::ContainerIter<RandomAccessContainer>
+c_partial_sort_copy(const C& sequence, RandomAccessContainer& result) {
+ return std::partial_sort_copy(container_algorithm_internal::c_begin(sequence),
+ container_algorithm_internal::c_end(sequence),
+ container_algorithm_internal::c_begin(result),
+ container_algorithm_internal::c_end(result));
+}
+
+// Overload of c_partial_sort_copy() for performing a `comp` comparison other
+// than the default `operator<`.
+template <typename C, typename RandomAccessContainer, typename Compare>
+container_algorithm_internal::ContainerIter<RandomAccessContainer>
+c_partial_sort_copy(const C& sequence, RandomAccessContainer& result,
+ Compare&& comp) {
+ return std::partial_sort_copy(container_algorithm_internal::c_begin(sequence),
+ container_algorithm_internal::c_end(sequence),
+ container_algorithm_internal::c_begin(result),
+ container_algorithm_internal::c_end(result),
+ std::forward<Compare>(comp));
+}
+
+// c_is_sorted_until()
+//
+// Container-based version of the <algorithm> `std::is_sorted_until()` function
+// to return the first element within a container that is not sorted in
+// ascending order as an iterator.
+template <typename C>
+container_algorithm_internal::ContainerIter<C> c_is_sorted_until(C& c) {
+ return std::is_sorted_until(container_algorithm_internal::c_begin(c),
+ container_algorithm_internal::c_end(c));
+}
+
+// Overload of c_is_sorted_until() for performing a `comp` comparison other than
+// the default `operator<`.
+template <typename C, typename Compare>
+container_algorithm_internal::ContainerIter<C> c_is_sorted_until(
+ C& c, Compare&& comp) {
+ return std::is_sorted_until(container_algorithm_internal::c_begin(c),
+ container_algorithm_internal::c_end(c),
+ std::forward<Compare>(comp));
+}
+
+// c_nth_element()
+//
+// Container-based version of the <algorithm> `std::nth_element()` function
+// to rearrange the elements within a container such that the `nth` element
+// would be in that position in an ordered sequence; other elements may be in
+// any order, except that all preceding `nth` will be less than that element,
+// and all following `nth` will be greater than that element.
+template <typename RandomAccessContainer>
+void c_nth_element(
+ RandomAccessContainer& sequence,
+ container_algorithm_internal::ContainerIter<RandomAccessContainer> nth) {
+ std::nth_element(container_algorithm_internal::c_begin(sequence), nth,
+ container_algorithm_internal::c_end(sequence));
+}
+
+// Overload of c_nth_element() for performing a `comp` comparison other than
+// the default `operator<`.
+template <typename RandomAccessContainer, typename Compare>
+void c_nth_element(
+ RandomAccessContainer& sequence,
+ container_algorithm_internal::ContainerIter<RandomAccessContainer> nth,
+ Compare&& comp) {
+ std::nth_element(container_algorithm_internal::c_begin(sequence), nth,
+ container_algorithm_internal::c_end(sequence),
+ std::forward<Compare>(comp));
+}
+
+//------------------------------------------------------------------------------
+// <algorithm> Binary Search
+//------------------------------------------------------------------------------
+
+// c_lower_bound()
+//
+// Container-based version of the <algorithm> `std::lower_bound()` function
+// to return an iterator pointing to the first element in a sorted container
+// which does not compare less than `value`.
+template <typename Sequence, typename T>
+container_algorithm_internal::ContainerIter<Sequence> c_lower_bound(
+ Sequence& sequence, T&& value) {
+ return std::lower_bound(container_algorithm_internal::c_begin(sequence),
+ container_algorithm_internal::c_end(sequence),
+ std::forward<T>(value));
+}
+
+// Overload of c_lower_bound() for performing a `comp` comparison other than
+// the default `operator<`.
+template <typename Sequence, typename T, typename Compare>
+container_algorithm_internal::ContainerIter<Sequence> c_lower_bound(
+ Sequence& sequence, T&& value, Compare&& comp) {
+ return std::lower_bound(container_algorithm_internal::c_begin(sequence),
+ container_algorithm_internal::c_end(sequence),
+ std::forward<T>(value), std::forward<Compare>(comp));
+}
+
+// c_upper_bound()
+//
+// Container-based version of the <algorithm> `std::upper_bound()` function
+// to return an iterator pointing to the first element in a sorted container
+// which is greater than `value`.
+template <typename Sequence, typename T>
+container_algorithm_internal::ContainerIter<Sequence> c_upper_bound(
+ Sequence& sequence, T&& value) {
+ return std::upper_bound(container_algorithm_internal::c_begin(sequence),
+ container_algorithm_internal::c_end(sequence),
+ std::forward<T>(value));
+}
+
+// Overload of c_upper_bound() for performing a `comp` comparison other than
+// the default `operator<`.
+template <typename Sequence, typename T, typename Compare>
+container_algorithm_internal::ContainerIter<Sequence> c_upper_bound(
+ Sequence& sequence, T&& value, Compare&& comp) {
+ return std::upper_bound(container_algorithm_internal::c_begin(sequence),
+ container_algorithm_internal::c_end(sequence),
+ std::forward<T>(value), std::forward<Compare>(comp));
+}
+
+// c_equal_range()
+//
+// Container-based version of the <algorithm> `std::equal_range()` function
+// to return an iterator pair pointing to the first and last elements in a
+// sorted container which compare equal to `value`.
+template <typename Sequence, typename T>
+container_algorithm_internal::ContainerIterPairType<Sequence, Sequence>
+c_equal_range(Sequence& sequence, T&& value) {
+ return std::equal_range(container_algorithm_internal::c_begin(sequence),
+ container_algorithm_internal::c_end(sequence),
+ std::forward<T>(value));
+}
+
+// Overload of c_equal_range() for performing a `comp` comparison other than
+// the default `operator<`.
+template <typename Sequence, typename T, typename Compare>
+container_algorithm_internal::ContainerIterPairType<Sequence, Sequence>
+c_equal_range(Sequence& sequence, T&& value, Compare&& comp) {
+ return std::equal_range(container_algorithm_internal::c_begin(sequence),
+ container_algorithm_internal::c_end(sequence),
+ std::forward<T>(value), std::forward<Compare>(comp));
+}
+
+// c_binary_search()
+//
+// Container-based version of the <algorithm> `std::binary_search()` function
+// to test if any element in the sorted container contains a value equivalent to
+// 'value'.
+template <typename Sequence, typename T>
+bool c_binary_search(Sequence&& sequence, T&& value) {
+ return std::binary_search(container_algorithm_internal::c_begin(sequence),
+ container_algorithm_internal::c_end(sequence),
+ std::forward<T>(value));
+}
+
+// Overload of c_binary_search() for performing a `comp` comparison other than
+// the default `operator<`.
+template <typename Sequence, typename T, typename Compare>
+bool c_binary_search(Sequence&& sequence, T&& value, Compare&& comp) {
+ return std::binary_search(container_algorithm_internal::c_begin(sequence),
+ container_algorithm_internal::c_end(sequence),
+ std::forward<T>(value),
+ std::forward<Compare>(comp));
+}
+
+//------------------------------------------------------------------------------
+// <algorithm> Merge functions
+//------------------------------------------------------------------------------
+
+// c_merge()
+//
+// Container-based version of the <algorithm> `std::merge()` function
+// to merge two sorted containers into a single sorted iterator.
+template <typename C1, typename C2, typename OutputIterator>
+OutputIterator c_merge(const C1& c1, const C2& c2, OutputIterator result) {
+ return std::merge(container_algorithm_internal::c_begin(c1),
+ container_algorithm_internal::c_end(c1),
+ container_algorithm_internal::c_begin(c2),
+ container_algorithm_internal::c_end(c2), result);
+}
+
+// Overload of c_merge() for performing a `comp` comparison other than
+// the default `operator<`.
+template <typename C1, typename C2, typename OutputIterator, typename Compare>
+OutputIterator c_merge(const C1& c1, const C2& c2, OutputIterator result,
+ Compare&& comp) {
+ return std::merge(container_algorithm_internal::c_begin(c1),
+ container_algorithm_internal::c_end(c1),
+ container_algorithm_internal::c_begin(c2),
+ container_algorithm_internal::c_end(c2), result,
+ std::forward<Compare>(comp));
+}
+
+// c_inplace_merge()
+//
+// Container-based version of the <algorithm> `std::inplace_merge()` function
+// to merge a supplied iterator `middle` into a container.
+template <typename C>
+void c_inplace_merge(C& c,
+ container_algorithm_internal::ContainerIter<C> middle) {
+ std::inplace_merge(container_algorithm_internal::c_begin(c), middle,
+ container_algorithm_internal::c_end(c));
+}
+
+// Overload of c_inplace_merge() for performing a merge using a `comp` other
+// than `operator<`.
+template <typename C, typename Compare>
+void c_inplace_merge(C& c,
+ container_algorithm_internal::ContainerIter<C> middle,
+ Compare&& comp) {
+ std::inplace_merge(container_algorithm_internal::c_begin(c), middle,
+ container_algorithm_internal::c_end(c),
+ std::forward<Compare>(comp));
+}
+
+// c_includes()
+//
+// Container-based version of the <algorithm> `std::includes()` function
+// to test whether a sorted container `c1` entirely contains another sorted
+// container `c2`.
+template <typename C1, typename C2>
+bool c_includes(const C1& c1, const C2& c2) {
+ return std::includes(container_algorithm_internal::c_begin(c1),
+ container_algorithm_internal::c_end(c1),
+ container_algorithm_internal::c_begin(c2),
+ container_algorithm_internal::c_end(c2));
+}
+
+// Overload of c_includes() for performing a merge using a `comp` other than
+// `operator<`.
+template <typename C1, typename C2, typename Compare>
+bool c_includes(const C1& c1, const C2& c2, Compare&& comp) {
+ return std::includes(container_algorithm_internal::c_begin(c1),
+ container_algorithm_internal::c_end(c1),
+ container_algorithm_internal::c_begin(c2),
+ container_algorithm_internal::c_end(c2),
+ std::forward<Compare>(comp));
+}
+
+// c_set_union()
+//
+// Container-based version of the <algorithm> `std::set_union()` function
+// to return an iterator containing the union of two containers; duplicate
+// values are not copied into the output.
+template <typename C1, typename C2, typename OutputIterator,
+ typename = typename std::enable_if<
+ !container_algorithm_internal::IsUnorderedContainer<C1>::value,
+ void>::type,
+ typename = typename std::enable_if<
+ !container_algorithm_internal::IsUnorderedContainer<C2>::value,
+ void>::type>
+OutputIterator c_set_union(const C1& c1, const C2& c2, OutputIterator output) {
+ return std::set_union(container_algorithm_internal::c_begin(c1),
+ container_algorithm_internal::c_end(c1),
+ container_algorithm_internal::c_begin(c2),
+ container_algorithm_internal::c_end(c2), output);
+}
+
+// Overload of c_set_union() for performing a merge using a `comp` other than
+// `operator<`.
+template <typename C1, typename C2, typename OutputIterator, typename Compare,
+ typename = typename std::enable_if<
+ !container_algorithm_internal::IsUnorderedContainer<C1>::value,
+ void>::type,
+ typename = typename std::enable_if<
+ !container_algorithm_internal::IsUnorderedContainer<C2>::value,
+ void>::type>
+OutputIterator c_set_union(const C1& c1, const C2& c2, OutputIterator output,
+ Compare&& comp) {
+ return std::set_union(container_algorithm_internal::c_begin(c1),
+ container_algorithm_internal::c_end(c1),
+ container_algorithm_internal::c_begin(c2),
+ container_algorithm_internal::c_end(c2), output,
+ std::forward<Compare>(comp));
+}
+
+// c_set_intersection()
+//
+// Container-based version of the <algorithm> `std::set_intersection()` function
+// to return an iterator containing the intersection of two containers.
+template <typename C1, typename C2, typename OutputIterator,
+ typename = typename std::enable_if<
+ !container_algorithm_internal::IsUnorderedContainer<C1>::value,
+ void>::type,
+ typename = typename std::enable_if<
+ !container_algorithm_internal::IsUnorderedContainer<C2>::value,
+ void>::type>
+OutputIterator c_set_intersection(const C1& c1, const C2& c2,
+ OutputIterator output) {
+ return std::set_intersection(container_algorithm_internal::c_begin(c1),
+ container_algorithm_internal::c_end(c1),
+ container_algorithm_internal::c_begin(c2),
+ container_algorithm_internal::c_end(c2), output);
+}
+
+// Overload of c_set_intersection() for performing a merge using a `comp` other
+// than `operator<`.
+template <typename C1, typename C2, typename OutputIterator, typename Compare,
+ typename = typename std::enable_if<
+ !container_algorithm_internal::IsUnorderedContainer<C1>::value,
+ void>::type,
+ typename = typename std::enable_if<
+ !container_algorithm_internal::IsUnorderedContainer<C2>::value,
+ void>::type>
+OutputIterator c_set_intersection(const C1& c1, const C2& c2,
+ OutputIterator output, Compare&& comp) {
+ return std::set_intersection(container_algorithm_internal::c_begin(c1),
+ container_algorithm_internal::c_end(c1),
+ container_algorithm_internal::c_begin(c2),
+ container_algorithm_internal::c_end(c2), output,
+ std::forward<Compare>(comp));
+}
+
+// c_set_difference()
+//
+// Container-based version of the <algorithm> `std::set_difference()` function
+// to return an iterator containing elements present in the first container but
+// not in the second.
+template <typename C1, typename C2, typename OutputIterator,
+ typename = typename std::enable_if<
+ !container_algorithm_internal::IsUnorderedContainer<C1>::value,
+ void>::type,
+ typename = typename std::enable_if<
+ !container_algorithm_internal::IsUnorderedContainer<C2>::value,
+ void>::type>
+OutputIterator c_set_difference(const C1& c1, const C2& c2,
+ OutputIterator output) {
+ return std::set_difference(container_algorithm_internal::c_begin(c1),
+ container_algorithm_internal::c_end(c1),
+ container_algorithm_internal::c_begin(c2),
+ container_algorithm_internal::c_end(c2), output);
+}
+
+// Overload of c_set_difference() for performing a merge using a `comp` other
+// than `operator<`.
+template <typename C1, typename C2, typename OutputIterator, typename Compare,
+ typename = typename std::enable_if<
+ !container_algorithm_internal::IsUnorderedContainer<C1>::value,
+ void>::type,
+ typename = typename std::enable_if<
+ !container_algorithm_internal::IsUnorderedContainer<C2>::value,
+ void>::type>
+OutputIterator c_set_difference(const C1& c1, const C2& c2,
+ OutputIterator output, Compare&& comp) {
+ return std::set_difference(container_algorithm_internal::c_begin(c1),
+ container_algorithm_internal::c_end(c1),
+ container_algorithm_internal::c_begin(c2),
+ container_algorithm_internal::c_end(c2), output,
+ std::forward<Compare>(comp));
+}
+
+// c_set_symmetric_difference()
+//
+// Container-based version of the <algorithm> `std::set_symmetric_difference()`
+// function to return an iterator containing elements present in either one
+// container or the other, but not both.
+template <typename C1, typename C2, typename OutputIterator,
+ typename = typename std::enable_if<
+ !container_algorithm_internal::IsUnorderedContainer<C1>::value,
+ void>::type,
+ typename = typename std::enable_if<
+ !container_algorithm_internal::IsUnorderedContainer<C2>::value,
+ void>::type>
+OutputIterator c_set_symmetric_difference(const C1& c1, const C2& c2,
+ OutputIterator output) {
+ return std::set_symmetric_difference(
+ container_algorithm_internal::c_begin(c1),
+ container_algorithm_internal::c_end(c1),
+ container_algorithm_internal::c_begin(c2),
+ container_algorithm_internal::c_end(c2), output);
+}
+
+// Overload of c_set_symmetric_difference() for performing a merge using a
+// `comp` other than `operator<`.
+template <typename C1, typename C2, typename OutputIterator, typename Compare,
+ typename = typename std::enable_if<
+ !container_algorithm_internal::IsUnorderedContainer<C1>::value,
+ void>::type,
+ typename = typename std::enable_if<
+ !container_algorithm_internal::IsUnorderedContainer<C2>::value,
+ void>::type>
+OutputIterator c_set_symmetric_difference(const C1& c1, const C2& c2,
+ OutputIterator output,
+ Compare&& comp) {
+ return std::set_symmetric_difference(
+ container_algorithm_internal::c_begin(c1),
+ container_algorithm_internal::c_end(c1),
+ container_algorithm_internal::c_begin(c2),
+ container_algorithm_internal::c_end(c2), output,
+ std::forward<Compare>(comp));
+}
+
+//------------------------------------------------------------------------------
+// <algorithm> Heap functions
+//------------------------------------------------------------------------------
+
+// c_push_heap()
+//
+// Container-based version of the <algorithm> `std::push_heap()` function
+// to push a value onto a container heap.
+template <typename RandomAccessContainer>
+void c_push_heap(RandomAccessContainer& sequence) {
+ std::push_heap(container_algorithm_internal::c_begin(sequence),
+ container_algorithm_internal::c_end(sequence));
+}
+
+// Overload of c_push_heap() for performing a push operation on a heap using a
+// `comp` other than `operator<`.
+template <typename RandomAccessContainer, typename Compare>
+void c_push_heap(RandomAccessContainer& sequence, Compare&& comp) {
+ std::push_heap(container_algorithm_internal::c_begin(sequence),
+ container_algorithm_internal::c_end(sequence),
+ std::forward<Compare>(comp));
+}
+
+// c_pop_heap()
+//
+// Container-based version of the <algorithm> `std::pop_heap()` function
+// to pop a value from a heap container.
+template <typename RandomAccessContainer>
+void c_pop_heap(RandomAccessContainer& sequence) {
+ std::pop_heap(container_algorithm_internal::c_begin(sequence),
+ container_algorithm_internal::c_end(sequence));
+}
+
+// Overload of c_pop_heap() for performing a pop operation on a heap using a
+// `comp` other than `operator<`.
+template <typename RandomAccessContainer, typename Compare>
+void c_pop_heap(RandomAccessContainer& sequence, Compare&& comp) {
+ std::pop_heap(container_algorithm_internal::c_begin(sequence),
+ container_algorithm_internal::c_end(sequence),
+ std::forward<Compare>(comp));
+}
+
+// c_make_heap()
+//
+// Container-based version of the <algorithm> `std::make_heap()` function
+// to make a container a heap.
+template <typename RandomAccessContainer>
+void c_make_heap(RandomAccessContainer& sequence) {
+ std::make_heap(container_algorithm_internal::c_begin(sequence),
+ container_algorithm_internal::c_end(sequence));
+}
+
+// Overload of c_make_heap() for performing heap comparisons using a
+// `comp` other than `operator<`
+template <typename RandomAccessContainer, typename Compare>
+void c_make_heap(RandomAccessContainer& sequence, Compare&& comp) {
+ std::make_heap(container_algorithm_internal::c_begin(sequence),
+ container_algorithm_internal::c_end(sequence),
+ std::forward<Compare>(comp));
+}
+
+// c_sort_heap()
+//
+// Container-based version of the <algorithm> `std::sort_heap()` function
+// to sort a heap into ascending order (after which it is no longer a heap).
+template <typename RandomAccessContainer>
+void c_sort_heap(RandomAccessContainer& sequence) {
+ std::sort_heap(container_algorithm_internal::c_begin(sequence),
+ container_algorithm_internal::c_end(sequence));
+}
+
+// Overload of c_sort_heap() for performing heap comparisons using a
+// `comp` other than `operator<`
+template <typename RandomAccessContainer, typename Compare>
+void c_sort_heap(RandomAccessContainer& sequence, Compare&& comp) {
+ std::sort_heap(container_algorithm_internal::c_begin(sequence),
+ container_algorithm_internal::c_end(sequence),
+ std::forward<Compare>(comp));
+}
+
+// c_is_heap()
+//
+// Container-based version of the <algorithm> `std::is_heap()` function
+// to check whether the given container is a heap.
+template <typename RandomAccessContainer>
+bool c_is_heap(const RandomAccessContainer& sequence) {
+ return std::is_heap(container_algorithm_internal::c_begin(sequence),
+ container_algorithm_internal::c_end(sequence));
+}
+
+// Overload of c_is_heap() for performing heap comparisons using a
+// `comp` other than `operator<`
+template <typename RandomAccessContainer, typename Compare>
+bool c_is_heap(const RandomAccessContainer& sequence, Compare&& comp) {
+ return std::is_heap(container_algorithm_internal::c_begin(sequence),
+ container_algorithm_internal::c_end(sequence),
+ std::forward<Compare>(comp));
+}
+
+// c_is_heap_until()
+//
+// Container-based version of the <algorithm> `std::is_heap_until()` function
+// to find the first element in a given container which is not in heap order.
+template <typename RandomAccessContainer>
+container_algorithm_internal::ContainerIter<RandomAccessContainer>
+c_is_heap_until(RandomAccessContainer& sequence) {
+ return std::is_heap_until(container_algorithm_internal::c_begin(sequence),
+ container_algorithm_internal::c_end(sequence));
+}
+
+// Overload of c_is_heap_until() for performing heap comparisons using a
+// `comp` other than `operator<`
+template <typename RandomAccessContainer, typename Compare>
+container_algorithm_internal::ContainerIter<RandomAccessContainer>
+c_is_heap_until(RandomAccessContainer& sequence, Compare&& comp) {
+ return std::is_heap_until(container_algorithm_internal::c_begin(sequence),
+ container_algorithm_internal::c_end(sequence),
+ std::forward<Compare>(comp));
+}
+
+//------------------------------------------------------------------------------
+// <algorithm> Min/max
+//------------------------------------------------------------------------------
+
+// c_min_element()
+//
+// Container-based version of the <algorithm> `std::min_element()` function
+// to return an iterator pointing to the element with the smallest value, using
+// `operator<` to make the comparisons.
+template <typename Sequence>
+container_algorithm_internal::ContainerIter<Sequence> c_min_element(
+ Sequence& sequence) {
+ return std::min_element(container_algorithm_internal::c_begin(sequence),
+ container_algorithm_internal::c_end(sequence));
+}
+
+// Overload of c_min_element() for performing a `comp` comparison other than
+// `operator<`.
+template <typename Sequence, typename Compare>
+container_algorithm_internal::ContainerIter<Sequence> c_min_element(
+ Sequence& sequence, Compare&& comp) {
+ return std::min_element(container_algorithm_internal::c_begin(sequence),
+ container_algorithm_internal::c_end(sequence),
+ std::forward<Compare>(comp));
+}
+
+// c_max_element()
+//
+// Container-based version of the <algorithm> `std::max_element()` function
+// to return an iterator pointing to the element with the largest value, using
+// `operator<` to make the comparisons.
+template <typename Sequence>
+container_algorithm_internal::ContainerIter<Sequence> c_max_element(
+ Sequence& sequence) {
+ return std::max_element(container_algorithm_internal::c_begin(sequence),
+ container_algorithm_internal::c_end(sequence));
+}
+
+// Overload of c_max_element() for performing a `comp` comparison other than
+// `operator<`.
+template <typename Sequence, typename Compare>
+container_algorithm_internal::ContainerIter<Sequence> c_max_element(
+ Sequence& sequence, Compare&& comp) {
+ return std::max_element(container_algorithm_internal::c_begin(sequence),
+ container_algorithm_internal::c_end(sequence),
+ std::forward<Compare>(comp));
+}
+
+// c_minmax_element()
+//
+// Container-based version of the <algorithm> `std::minmax_element()` function
+// to return a pair of iterators pointing to the elements containing the
+// smallest and largest values, respectively, using `operator<` to make the
+// comparisons.
+template <typename C>
+container_algorithm_internal::ContainerIterPairType<C, C>
+c_minmax_element(C& c) {
+ return std::minmax_element(container_algorithm_internal::c_begin(c),
+ container_algorithm_internal::c_end(c));
+}
+
+// Overload of c_minmax_element() for performing `comp` comparisons other than
+// `operator<`.
+template <typename C, typename Compare>
+container_algorithm_internal::ContainerIterPairType<C, C>
+c_minmax_element(C& c, Compare&& comp) {
+ return std::minmax_element(container_algorithm_internal::c_begin(c),
+ container_algorithm_internal::c_end(c),
+ std::forward<Compare>(comp));
+}
+
+//------------------------------------------------------------------------------
+// <algorithm> Lexicographical Comparisons
+//------------------------------------------------------------------------------
+
+// c_lexicographical_compare()
+//
+// Container-based version of the <algorithm> `std::lexicographical_compare()`
+// function to lexicographically compare (e.g. sort words alphabetically) two
+// container sequences. The comparison is performed using `operator<`. Note
+// that capital letters ("A-Z") have ASCII values less than lowercase letters
+// ("a-z").
+template <typename Sequence1, typename Sequence2>
+bool c_lexicographical_compare(Sequence1&& sequence1, Sequence2&& sequence2) {
+ return std::lexicographical_compare(
+ container_algorithm_internal::c_begin(sequence1),
+ container_algorithm_internal::c_end(sequence1),
+ container_algorithm_internal::c_begin(sequence2),
+ container_algorithm_internal::c_end(sequence2));
+}
+
+// Overload of c_lexicographical_compare() for performing a lexicographical
+// comparison using a `comp` operator instead of `operator<`.
+template <typename Sequence1, typename Sequence2, typename Compare>
+bool c_lexicographical_compare(Sequence1&& sequence1, Sequence2&& sequence2,
+ Compare&& comp) {
+ return std::lexicographical_compare(
+ container_algorithm_internal::c_begin(sequence1),
+ container_algorithm_internal::c_end(sequence1),
+ container_algorithm_internal::c_begin(sequence2),
+ container_algorithm_internal::c_end(sequence2),
+ std::forward<Compare>(comp));
+}
+
+// c_next_permutation()
+//
+// Container-based version of the <algorithm> `std::next_permutation()` function
+// to rearrange a container's elements into the next lexicographically greater
+// permutation.
+template <typename C>
+bool c_next_permutation(C& c) {
+ return std::next_permutation(container_algorithm_internal::c_begin(c),
+ container_algorithm_internal::c_end(c));
+}
+
+// Overload of c_next_permutation() for performing a lexicographical
+// comparison using a `comp` operator instead of `operator<`.
+template <typename C, typename Compare>
+bool c_next_permutation(C& c, Compare&& comp) {
+ return std::next_permutation(container_algorithm_internal::c_begin(c),
+ container_algorithm_internal::c_end(c),
+ std::forward<Compare>(comp));
+}
+
+// c_prev_permutation()
+//
+// Container-based version of the <algorithm> `std::prev_permutation()` function
+// to rearrange a container's elements into the next lexicographically lesser
+// permutation.
+template <typename C>
+bool c_prev_permutation(C& c) {
+ return std::prev_permutation(container_algorithm_internal::c_begin(c),
+ container_algorithm_internal::c_end(c));
+}
+
+// Overload of c_prev_permutation() for performing a lexicographical
+// comparison using a `comp` operator instead of `operator<`.
+template <typename C, typename Compare>
+bool c_prev_permutation(C& c, Compare&& comp) {
+ return std::prev_permutation(container_algorithm_internal::c_begin(c),
+ container_algorithm_internal::c_end(c),
+ std::forward<Compare>(comp));
+}
+
+//------------------------------------------------------------------------------
+// <numeric> algorithms
+//------------------------------------------------------------------------------
+
+// c_iota()
+//
+// Container-based version of the <algorithm> `std::iota()` function
+// to compute successive values of `value`, as if incremented with `++value`
+// after each element is written. and write them to the container.
+template <typename Sequence, typename T>
+void c_iota(Sequence& sequence, T&& value) {
+ std::iota(container_algorithm_internal::c_begin(sequence),
+ container_algorithm_internal::c_end(sequence),
+ std::forward<T>(value));
+}
+// c_accumulate()
+//
+// Container-based version of the <algorithm> `std::accumulate()` function
+// to accumulate the element values of a container to `init` and return that
+// accumulation by value.
+//
+// Note: Due to a language technicality this function has return type
+// absl::decay_t<T>. As a user of this function you can casually read
+// this as "returns T by value" and assume it does the right thing.
+template <typename Sequence, typename T>
+decay_t<T> c_accumulate(const Sequence& sequence, T&& init) {
+ return std::accumulate(container_algorithm_internal::c_begin(sequence),
+ container_algorithm_internal::c_end(sequence),
+ std::forward<T>(init));
+}
+
+// Overload of c_accumulate() for using a binary operations other than
+// addition for computing the accumulation.
+template <typename Sequence, typename T, typename BinaryOp>
+decay_t<T> c_accumulate(const Sequence& sequence, T&& init,
+ BinaryOp&& binary_op) {
+ return std::accumulate(container_algorithm_internal::c_begin(sequence),
+ container_algorithm_internal::c_end(sequence),
+ std::forward<T>(init),
+ std::forward<BinaryOp>(binary_op));
+}
+
+// c_inner_product()
+//
+// Container-based version of the <algorithm> `std::inner_product()` function
+// to compute the cumulative inner product of container element pairs.
+//
+// Note: Due to a language technicality this function has return type
+// absl::decay_t<T>. As a user of this function you can casually read
+// this as "returns T by value" and assume it does the right thing.
+template <typename Sequence1, typename Sequence2, typename T>
+decay_t<T> c_inner_product(const Sequence1& factors1, const Sequence2& factors2,
+ T&& sum) {
+ return std::inner_product(container_algorithm_internal::c_begin(factors1),
+ container_algorithm_internal::c_end(factors1),
+ container_algorithm_internal::c_begin(factors2),
+ std::forward<T>(sum));
+}
+
+// Overload of c_inner_product() for using binary operations other than
+// `operator+` (for computing the accumulation) and `operator*` (for computing
+// the product between the two container's element pair).
+template <typename Sequence1, typename Sequence2, typename T,
+ typename BinaryOp1, typename BinaryOp2>
+decay_t<T> c_inner_product(const Sequence1& factors1, const Sequence2& factors2,
+ T&& sum, BinaryOp1&& op1, BinaryOp2&& op2) {
+ return std::inner_product(container_algorithm_internal::c_begin(factors1),
+ container_algorithm_internal::c_end(factors1),
+ container_algorithm_internal::c_begin(factors2),
+ std::forward<T>(sum), std::forward<BinaryOp1>(op1),
+ std::forward<BinaryOp2>(op2));
+}
+
+// c_adjacent_difference()
+//
+// Container-based version of the <algorithm> `std::adjacent_difference()`
+// function to compute the difference between each element and the one preceding
+// it and write it to an iterator.
+template <typename InputSequence, typename OutputIt>
+OutputIt c_adjacent_difference(const InputSequence& input,
+ OutputIt output_first) {
+ return std::adjacent_difference(container_algorithm_internal::c_begin(input),
+ container_algorithm_internal::c_end(input),
+ output_first);
+}
+
+// Overload of c_adjacent_difference() for using a binary operation other than
+// subtraction to compute the adjacent difference.
+template <typename InputSequence, typename OutputIt, typename BinaryOp>
+OutputIt c_adjacent_difference(const InputSequence& input,
+ OutputIt output_first, BinaryOp&& op) {
+ return std::adjacent_difference(container_algorithm_internal::c_begin(input),
+ container_algorithm_internal::c_end(input),
+ output_first, std::forward<BinaryOp>(op));
+}
+
+// c_partial_sum()
+//
+// Container-based version of the <algorithm> `std::partial_sum()` function
+// to compute the partial sum of the elements in a sequence and write them
+// to an iterator. The partial sum is the sum of all element values so far in
+// the sequence.
+template <typename InputSequence, typename OutputIt>
+OutputIt c_partial_sum(const InputSequence& input, OutputIt output_first) {
+ return std::partial_sum(container_algorithm_internal::c_begin(input),
+ container_algorithm_internal::c_end(input),
+ output_first);
+}
+
+// Overload of c_partial_sum() for using a binary operation other than addition
+// to compute the "partial sum".
+template <typename InputSequence, typename OutputIt, typename BinaryOp>
+OutputIt c_partial_sum(const InputSequence& input, OutputIt output_first,
+ BinaryOp&& op) {
+ return std::partial_sum(container_algorithm_internal::c_begin(input),
+ container_algorithm_internal::c_end(input),
+ output_first, std::forward<BinaryOp>(op));
+}
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_ALGORITHM_CONTAINER_H_
diff --git a/third_party/abseil/src/absl/algorithm/container_test.cc b/third_party/abseil/src/absl/algorithm/container_test.cc
new file mode 100644
index 0000000..605afc8
--- /dev/null
+++ b/third_party/abseil/src/absl/algorithm/container_test.cc
@@ -0,0 +1,1124 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/algorithm/container.h"
+
+#include <functional>
+#include <initializer_list>
+#include <iterator>
+#include <list>
+#include <memory>
+#include <ostream>
+#include <random>
+#include <set>
+#include <unordered_set>
+#include <utility>
+#include <valarray>
+#include <vector>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/base/casts.h"
+#include "absl/base/macros.h"
+#include "absl/memory/memory.h"
+#include "absl/types/span.h"
+
+namespace {
+
+using ::testing::Each;
+using ::testing::ElementsAre;
+using ::testing::Gt;
+using ::testing::IsNull;
+using ::testing::Lt;
+using ::testing::Pointee;
+using ::testing::Truly;
+using ::testing::UnorderedElementsAre;
+
+// Most of these tests just check that the code compiles, not that it
+// does the right thing. That's fine since the functions just forward
+// to the STL implementation.
+class NonMutatingTest : public testing::Test {
+ protected:
+ std::unordered_set<int> container_ = {1, 2, 3};
+ std::list<int> sequence_ = {1, 2, 3};
+ std::vector<int> vector_ = {1, 2, 3};
+ int array_[3] = {1, 2, 3};
+};
+
+struct AccumulateCalls {
+ void operator()(int value) { calls.push_back(value); }
+ std::vector<int> calls;
+};
+
+bool Predicate(int value) { return value < 3; }
+bool BinPredicate(int v1, int v2) { return v1 < v2; }
+bool Equals(int v1, int v2) { return v1 == v2; }
+bool IsOdd(int x) { return x % 2 != 0; }
+
+TEST_F(NonMutatingTest, Distance) {
+ EXPECT_EQ(container_.size(), absl::c_distance(container_));
+ EXPECT_EQ(sequence_.size(), absl::c_distance(sequence_));
+ EXPECT_EQ(vector_.size(), absl::c_distance(vector_));
+ EXPECT_EQ(ABSL_ARRAYSIZE(array_), absl::c_distance(array_));
+
+ // Works with a temporary argument.
+ EXPECT_EQ(vector_.size(), absl::c_distance(std::vector<int>(vector_)));
+}
+
+TEST_F(NonMutatingTest, Distance_OverloadedBeginEnd) {
+ // Works with classes which have custom ADL-selected overloads of std::begin
+ // and std::end.
+ std::initializer_list<int> a = {1, 2, 3};
+ std::valarray<int> b = {1, 2, 3};
+ EXPECT_EQ(3, absl::c_distance(a));
+ EXPECT_EQ(3, absl::c_distance(b));
+
+ // It is assumed that other c_* functions use the same mechanism for
+ // ADL-selecting begin/end overloads.
+}
+
+TEST_F(NonMutatingTest, ForEach) {
+ AccumulateCalls c = absl::c_for_each(container_, AccumulateCalls());
+ // Don't rely on the unordered_set's order.
+ std::sort(c.calls.begin(), c.calls.end());
+ EXPECT_EQ(vector_, c.calls);
+
+ // Works with temporary container, too.
+ AccumulateCalls c2 =
+ absl::c_for_each(std::unordered_set<int>(container_), AccumulateCalls());
+ std::sort(c2.calls.begin(), c2.calls.end());
+ EXPECT_EQ(vector_, c2.calls);
+}
+
+TEST_F(NonMutatingTest, FindReturnsCorrectType) {
+ auto it = absl::c_find(container_, 3);
+ EXPECT_EQ(3, *it);
+ absl::c_find(absl::implicit_cast<const std::list<int>&>(sequence_), 3);
+}
+
+TEST_F(NonMutatingTest, FindIf) { absl::c_find_if(container_, Predicate); }
+
+TEST_F(NonMutatingTest, FindIfNot) {
+ absl::c_find_if_not(container_, Predicate);
+}
+
+TEST_F(NonMutatingTest, FindEnd) {
+ absl::c_find_end(sequence_, vector_);
+ absl::c_find_end(vector_, sequence_);
+}
+
+TEST_F(NonMutatingTest, FindEndWithPredicate) {
+ absl::c_find_end(sequence_, vector_, BinPredicate);
+ absl::c_find_end(vector_, sequence_, BinPredicate);
+}
+
+TEST_F(NonMutatingTest, FindFirstOf) {
+ absl::c_find_first_of(container_, sequence_);
+ absl::c_find_first_of(sequence_, container_);
+}
+
+TEST_F(NonMutatingTest, FindFirstOfWithPredicate) {
+ absl::c_find_first_of(container_, sequence_, BinPredicate);
+ absl::c_find_first_of(sequence_, container_, BinPredicate);
+}
+
+TEST_F(NonMutatingTest, AdjacentFind) { absl::c_adjacent_find(sequence_); }
+
+TEST_F(NonMutatingTest, AdjacentFindWithPredicate) {
+ absl::c_adjacent_find(sequence_, BinPredicate);
+}
+
+TEST_F(NonMutatingTest, Count) { EXPECT_EQ(1, absl::c_count(container_, 3)); }
+
+TEST_F(NonMutatingTest, CountIf) {
+ EXPECT_EQ(2, absl::c_count_if(container_, Predicate));
+ const std::unordered_set<int>& const_container = container_;
+ EXPECT_EQ(2, absl::c_count_if(const_container, Predicate));
+}
+
+TEST_F(NonMutatingTest, Mismatch) {
+ // Testing necessary as absl::c_mismatch executes logic.
+ {
+ auto result = absl::c_mismatch(vector_, sequence_);
+ EXPECT_EQ(result.first, vector_.end());
+ EXPECT_EQ(result.second, sequence_.end());
+ }
+ {
+ auto result = absl::c_mismatch(sequence_, vector_);
+ EXPECT_EQ(result.first, sequence_.end());
+ EXPECT_EQ(result.second, vector_.end());
+ }
+
+ sequence_.back() = 5;
+ {
+ auto result = absl::c_mismatch(vector_, sequence_);
+ EXPECT_EQ(result.first, std::prev(vector_.end()));
+ EXPECT_EQ(result.second, std::prev(sequence_.end()));
+ }
+ {
+ auto result = absl::c_mismatch(sequence_, vector_);
+ EXPECT_EQ(result.first, std::prev(sequence_.end()));
+ EXPECT_EQ(result.second, std::prev(vector_.end()));
+ }
+
+ sequence_.pop_back();
+ {
+ auto result = absl::c_mismatch(vector_, sequence_);
+ EXPECT_EQ(result.first, std::prev(vector_.end()));
+ EXPECT_EQ(result.second, sequence_.end());
+ }
+ {
+ auto result = absl::c_mismatch(sequence_, vector_);
+ EXPECT_EQ(result.first, sequence_.end());
+ EXPECT_EQ(result.second, std::prev(vector_.end()));
+ }
+ {
+ struct NoNotEquals {
+ constexpr bool operator==(NoNotEquals) const { return true; }
+ constexpr bool operator!=(NoNotEquals) const = delete;
+ };
+ std::vector<NoNotEquals> first;
+ std::list<NoNotEquals> second;
+
+ // Check this still compiles.
+ absl::c_mismatch(first, second);
+ }
+}
+
+TEST_F(NonMutatingTest, MismatchWithPredicate) {
+ // Testing necessary as absl::c_mismatch executes logic.
+ {
+ auto result = absl::c_mismatch(vector_, sequence_, BinPredicate);
+ EXPECT_EQ(result.first, vector_.begin());
+ EXPECT_EQ(result.second, sequence_.begin());
+ }
+ {
+ auto result = absl::c_mismatch(sequence_, vector_, BinPredicate);
+ EXPECT_EQ(result.first, sequence_.begin());
+ EXPECT_EQ(result.second, vector_.begin());
+ }
+
+ sequence_.front() = 0;
+ {
+ auto result = absl::c_mismatch(vector_, sequence_, BinPredicate);
+ EXPECT_EQ(result.first, vector_.begin());
+ EXPECT_EQ(result.second, sequence_.begin());
+ }
+ {
+ auto result = absl::c_mismatch(sequence_, vector_, BinPredicate);
+ EXPECT_EQ(result.first, std::next(sequence_.begin()));
+ EXPECT_EQ(result.second, std::next(vector_.begin()));
+ }
+
+ sequence_.clear();
+ {
+ auto result = absl::c_mismatch(vector_, sequence_, BinPredicate);
+ EXPECT_EQ(result.first, vector_.begin());
+ EXPECT_EQ(result.second, sequence_.end());
+ }
+ {
+ auto result = absl::c_mismatch(sequence_, vector_, BinPredicate);
+ EXPECT_EQ(result.first, sequence_.end());
+ EXPECT_EQ(result.second, vector_.begin());
+ }
+}
+
+TEST_F(NonMutatingTest, Equal) {
+ EXPECT_TRUE(absl::c_equal(vector_, sequence_));
+ EXPECT_TRUE(absl::c_equal(sequence_, vector_));
+ EXPECT_TRUE(absl::c_equal(sequence_, array_));
+ EXPECT_TRUE(absl::c_equal(array_, vector_));
+
+ // Test that behavior appropriately differs from that of equal().
+ std::vector<int> vector_plus = {1, 2, 3};
+ vector_plus.push_back(4);
+ EXPECT_FALSE(absl::c_equal(vector_plus, sequence_));
+ EXPECT_FALSE(absl::c_equal(sequence_, vector_plus));
+ EXPECT_FALSE(absl::c_equal(array_, vector_plus));
+}
+
+TEST_F(NonMutatingTest, EqualWithPredicate) {
+ EXPECT_TRUE(absl::c_equal(vector_, sequence_, Equals));
+ EXPECT_TRUE(absl::c_equal(sequence_, vector_, Equals));
+ EXPECT_TRUE(absl::c_equal(array_, sequence_, Equals));
+ EXPECT_TRUE(absl::c_equal(vector_, array_, Equals));
+
+ // Test that behavior appropriately differs from that of equal().
+ std::vector<int> vector_plus = {1, 2, 3};
+ vector_plus.push_back(4);
+ EXPECT_FALSE(absl::c_equal(vector_plus, sequence_, Equals));
+ EXPECT_FALSE(absl::c_equal(sequence_, vector_plus, Equals));
+ EXPECT_FALSE(absl::c_equal(vector_plus, array_, Equals));
+}
+
+TEST_F(NonMutatingTest, IsPermutation) {
+ auto vector_permut_ = vector_;
+ std::next_permutation(vector_permut_.begin(), vector_permut_.end());
+ EXPECT_TRUE(absl::c_is_permutation(vector_permut_, sequence_));
+ EXPECT_TRUE(absl::c_is_permutation(sequence_, vector_permut_));
+
+ // Test that behavior appropriately differs from that of is_permutation().
+ std::vector<int> vector_plus = {1, 2, 3};
+ vector_plus.push_back(4);
+ EXPECT_FALSE(absl::c_is_permutation(vector_plus, sequence_));
+ EXPECT_FALSE(absl::c_is_permutation(sequence_, vector_plus));
+}
+
+TEST_F(NonMutatingTest, IsPermutationWithPredicate) {
+ auto vector_permut_ = vector_;
+ std::next_permutation(vector_permut_.begin(), vector_permut_.end());
+ EXPECT_TRUE(absl::c_is_permutation(vector_permut_, sequence_, Equals));
+ EXPECT_TRUE(absl::c_is_permutation(sequence_, vector_permut_, Equals));
+
+ // Test that behavior appropriately differs from that of is_permutation().
+ std::vector<int> vector_plus = {1, 2, 3};
+ vector_plus.push_back(4);
+ EXPECT_FALSE(absl::c_is_permutation(vector_plus, sequence_, Equals));
+ EXPECT_FALSE(absl::c_is_permutation(sequence_, vector_plus, Equals));
+}
+
+TEST_F(NonMutatingTest, Search) {
+ absl::c_search(sequence_, vector_);
+ absl::c_search(vector_, sequence_);
+ absl::c_search(array_, sequence_);
+}
+
+TEST_F(NonMutatingTest, SearchWithPredicate) {
+ absl::c_search(sequence_, vector_, BinPredicate);
+ absl::c_search(vector_, sequence_, BinPredicate);
+}
+
+TEST_F(NonMutatingTest, SearchN) { absl::c_search_n(sequence_, 3, 1); }
+
+TEST_F(NonMutatingTest, SearchNWithPredicate) {
+ absl::c_search_n(sequence_, 3, 1, BinPredicate);
+}
+
+TEST_F(NonMutatingTest, LowerBound) {
+ std::list<int>::iterator i = absl::c_lower_bound(sequence_, 3);
+ ASSERT_TRUE(i != sequence_.end());
+ EXPECT_EQ(2, std::distance(sequence_.begin(), i));
+ EXPECT_EQ(3, *i);
+}
+
+TEST_F(NonMutatingTest, LowerBoundWithPredicate) {
+ std::vector<int> v(vector_);
+ std::sort(v.begin(), v.end(), std::greater<int>());
+ std::vector<int>::iterator i = absl::c_lower_bound(v, 3, std::greater<int>());
+ EXPECT_TRUE(i == v.begin());
+ EXPECT_EQ(3, *i);
+}
+
+TEST_F(NonMutatingTest, UpperBound) {
+ std::list<int>::iterator i = absl::c_upper_bound(sequence_, 1);
+ ASSERT_TRUE(i != sequence_.end());
+ EXPECT_EQ(1, std::distance(sequence_.begin(), i));
+ EXPECT_EQ(2, *i);
+}
+
+TEST_F(NonMutatingTest, UpperBoundWithPredicate) {
+ std::vector<int> v(vector_);
+ std::sort(v.begin(), v.end(), std::greater<int>());
+ std::vector<int>::iterator i = absl::c_upper_bound(v, 1, std::greater<int>());
+ EXPECT_EQ(3, i - v.begin());
+ EXPECT_TRUE(i == v.end());
+}
+
+TEST_F(NonMutatingTest, EqualRange) {
+ std::pair<std::list<int>::iterator, std::list<int>::iterator> p =
+ absl::c_equal_range(sequence_, 2);
+ EXPECT_EQ(1, std::distance(sequence_.begin(), p.first));
+ EXPECT_EQ(2, std::distance(sequence_.begin(), p.second));
+}
+
+TEST_F(NonMutatingTest, EqualRangeArray) {
+ auto p = absl::c_equal_range(array_, 2);
+ EXPECT_EQ(1, std::distance(std::begin(array_), p.first));
+ EXPECT_EQ(2, std::distance(std::begin(array_), p.second));
+}
+
+TEST_F(NonMutatingTest, EqualRangeWithPredicate) {
+ std::vector<int> v(vector_);
+ std::sort(v.begin(), v.end(), std::greater<int>());
+ std::pair<std::vector<int>::iterator, std::vector<int>::iterator> p =
+ absl::c_equal_range(v, 2, std::greater<int>());
+ EXPECT_EQ(1, std::distance(v.begin(), p.first));
+ EXPECT_EQ(2, std::distance(v.begin(), p.second));
+}
+
+TEST_F(NonMutatingTest, BinarySearch) {
+ EXPECT_TRUE(absl::c_binary_search(vector_, 2));
+ EXPECT_TRUE(absl::c_binary_search(std::vector<int>(vector_), 2));
+}
+
+TEST_F(NonMutatingTest, BinarySearchWithPredicate) {
+ std::vector<int> v(vector_);
+ std::sort(v.begin(), v.end(), std::greater<int>());
+ EXPECT_TRUE(absl::c_binary_search(v, 2, std::greater<int>()));
+ EXPECT_TRUE(
+ absl::c_binary_search(std::vector<int>(v), 2, std::greater<int>()));
+}
+
+TEST_F(NonMutatingTest, MinElement) {
+ std::list<int>::iterator i = absl::c_min_element(sequence_);
+ ASSERT_TRUE(i != sequence_.end());
+ EXPECT_EQ(*i, 1);
+}
+
+TEST_F(NonMutatingTest, MinElementWithPredicate) {
+ std::list<int>::iterator i =
+ absl::c_min_element(sequence_, std::greater<int>());
+ ASSERT_TRUE(i != sequence_.end());
+ EXPECT_EQ(*i, 3);
+}
+
+TEST_F(NonMutatingTest, MaxElement) {
+ std::list<int>::iterator i = absl::c_max_element(sequence_);
+ ASSERT_TRUE(i != sequence_.end());
+ EXPECT_EQ(*i, 3);
+}
+
+TEST_F(NonMutatingTest, MaxElementWithPredicate) {
+ std::list<int>::iterator i =
+ absl::c_max_element(sequence_, std::greater<int>());
+ ASSERT_TRUE(i != sequence_.end());
+ EXPECT_EQ(*i, 1);
+}
+
+TEST_F(NonMutatingTest, LexicographicalCompare) {
+ EXPECT_FALSE(absl::c_lexicographical_compare(sequence_, sequence_));
+
+ std::vector<int> v;
+ v.push_back(1);
+ v.push_back(2);
+ v.push_back(4);
+
+ EXPECT_TRUE(absl::c_lexicographical_compare(sequence_, v));
+ EXPECT_TRUE(absl::c_lexicographical_compare(std::list<int>(sequence_), v));
+}
+
+TEST_F(NonMutatingTest, LexicographicalCopmareWithPredicate) {
+ EXPECT_FALSE(absl::c_lexicographical_compare(sequence_, sequence_,
+ std::greater<int>()));
+
+ std::vector<int> v;
+ v.push_back(1);
+ v.push_back(2);
+ v.push_back(4);
+
+ EXPECT_TRUE(
+ absl::c_lexicographical_compare(v, sequence_, std::greater<int>()));
+ EXPECT_TRUE(absl::c_lexicographical_compare(
+ std::vector<int>(v), std::list<int>(sequence_), std::greater<int>()));
+}
+
+TEST_F(NonMutatingTest, Includes) {
+ std::set<int> s(vector_.begin(), vector_.end());
+ s.insert(4);
+ EXPECT_TRUE(absl::c_includes(s, vector_));
+}
+
+TEST_F(NonMutatingTest, IncludesWithPredicate) {
+ std::vector<int> v = {3, 2, 1};
+ std::set<int, std::greater<int>> s(v.begin(), v.end());
+ s.insert(4);
+ EXPECT_TRUE(absl::c_includes(s, v, std::greater<int>()));
+}
+
+class NumericMutatingTest : public testing::Test {
+ protected:
+ std::list<int> list_ = {1, 2, 3};
+ std::vector<int> output_;
+};
+
+TEST_F(NumericMutatingTest, Iota) {
+ absl::c_iota(list_, 5);
+ std::list<int> expected{5, 6, 7};
+ EXPECT_EQ(list_, expected);
+}
+
+TEST_F(NonMutatingTest, Accumulate) {
+ EXPECT_EQ(absl::c_accumulate(sequence_, 4), 1 + 2 + 3 + 4);
+}
+
+TEST_F(NonMutatingTest, AccumulateWithBinaryOp) {
+ EXPECT_EQ(absl::c_accumulate(sequence_, 4, std::multiplies<int>()),
+ 1 * 2 * 3 * 4);
+}
+
+TEST_F(NonMutatingTest, AccumulateLvalueInit) {
+ int lvalue = 4;
+ EXPECT_EQ(absl::c_accumulate(sequence_, lvalue), 1 + 2 + 3 + 4);
+}
+
+TEST_F(NonMutatingTest, AccumulateWithBinaryOpLvalueInit) {
+ int lvalue = 4;
+ EXPECT_EQ(absl::c_accumulate(sequence_, lvalue, std::multiplies<int>()),
+ 1 * 2 * 3 * 4);
+}
+
+TEST_F(NonMutatingTest, InnerProduct) {
+ EXPECT_EQ(absl::c_inner_product(sequence_, vector_, 1000),
+ 1000 + 1 * 1 + 2 * 2 + 3 * 3);
+}
+
+TEST_F(NonMutatingTest, InnerProductWithBinaryOps) {
+ EXPECT_EQ(absl::c_inner_product(sequence_, vector_, 10,
+ std::multiplies<int>(), std::plus<int>()),
+ 10 * (1 + 1) * (2 + 2) * (3 + 3));
+}
+
+TEST_F(NonMutatingTest, InnerProductLvalueInit) {
+ int lvalue = 1000;
+ EXPECT_EQ(absl::c_inner_product(sequence_, vector_, lvalue),
+ 1000 + 1 * 1 + 2 * 2 + 3 * 3);
+}
+
+TEST_F(NonMutatingTest, InnerProductWithBinaryOpsLvalueInit) {
+ int lvalue = 10;
+ EXPECT_EQ(absl::c_inner_product(sequence_, vector_, lvalue,
+ std::multiplies<int>(), std::plus<int>()),
+ 10 * (1 + 1) * (2 + 2) * (3 + 3));
+}
+
+TEST_F(NumericMutatingTest, AdjacentDifference) {
+ auto last = absl::c_adjacent_difference(list_, std::back_inserter(output_));
+ *last = 1000;
+ std::vector<int> expected{1, 2 - 1, 3 - 2, 1000};
+ EXPECT_EQ(output_, expected);
+}
+
+TEST_F(NumericMutatingTest, AdjacentDifferenceWithBinaryOp) {
+ auto last = absl::c_adjacent_difference(list_, std::back_inserter(output_),
+ std::multiplies<int>());
+ *last = 1000;
+ std::vector<int> expected{1, 2 * 1, 3 * 2, 1000};
+ EXPECT_EQ(output_, expected);
+}
+
+TEST_F(NumericMutatingTest, PartialSum) {
+ auto last = absl::c_partial_sum(list_, std::back_inserter(output_));
+ *last = 1000;
+ std::vector<int> expected{1, 1 + 2, 1 + 2 + 3, 1000};
+ EXPECT_EQ(output_, expected);
+}
+
+TEST_F(NumericMutatingTest, PartialSumWithBinaryOp) {
+ auto last = absl::c_partial_sum(list_, std::back_inserter(output_),
+ std::multiplies<int>());
+ *last = 1000;
+ std::vector<int> expected{1, 1 * 2, 1 * 2 * 3, 1000};
+ EXPECT_EQ(output_, expected);
+}
+
+TEST_F(NonMutatingTest, LinearSearch) {
+ EXPECT_TRUE(absl::c_linear_search(container_, 3));
+ EXPECT_FALSE(absl::c_linear_search(container_, 4));
+}
+
+TEST_F(NonMutatingTest, AllOf) {
+ const std::vector<int>& v = vector_;
+ EXPECT_FALSE(absl::c_all_of(v, [](int x) { return x > 1; }));
+ EXPECT_TRUE(absl::c_all_of(v, [](int x) { return x > 0; }));
+}
+
+TEST_F(NonMutatingTest, AnyOf) {
+ const std::vector<int>& v = vector_;
+ EXPECT_TRUE(absl::c_any_of(v, [](int x) { return x > 2; }));
+ EXPECT_FALSE(absl::c_any_of(v, [](int x) { return x > 5; }));
+}
+
+TEST_F(NonMutatingTest, NoneOf) {
+ const std::vector<int>& v = vector_;
+ EXPECT_FALSE(absl::c_none_of(v, [](int x) { return x > 2; }));
+ EXPECT_TRUE(absl::c_none_of(v, [](int x) { return x > 5; }));
+}
+
+TEST_F(NonMutatingTest, MinMaxElementLess) {
+ std::pair<std::vector<int>::const_iterator, std::vector<int>::const_iterator>
+ p = absl::c_minmax_element(vector_, std::less<int>());
+ EXPECT_TRUE(p.first == vector_.begin());
+ EXPECT_TRUE(p.second == vector_.begin() + 2);
+}
+
+TEST_F(NonMutatingTest, MinMaxElementGreater) {
+ std::pair<std::vector<int>::const_iterator, std::vector<int>::const_iterator>
+ p = absl::c_minmax_element(vector_, std::greater<int>());
+ EXPECT_TRUE(p.first == vector_.begin() + 2);
+ EXPECT_TRUE(p.second == vector_.begin());
+}
+
+TEST_F(NonMutatingTest, MinMaxElementNoPredicate) {
+ std::pair<std::vector<int>::const_iterator, std::vector<int>::const_iterator>
+ p = absl::c_minmax_element(vector_);
+ EXPECT_TRUE(p.first == vector_.begin());
+ EXPECT_TRUE(p.second == vector_.begin() + 2);
+}
+
+class SortingTest : public testing::Test {
+ protected:
+ std::list<int> sorted_ = {1, 2, 3, 4};
+ std::list<int> unsorted_ = {2, 4, 1, 3};
+ std::list<int> reversed_ = {4, 3, 2, 1};
+};
+
+TEST_F(SortingTest, IsSorted) {
+ EXPECT_TRUE(absl::c_is_sorted(sorted_));
+ EXPECT_FALSE(absl::c_is_sorted(unsorted_));
+ EXPECT_FALSE(absl::c_is_sorted(reversed_));
+}
+
+TEST_F(SortingTest, IsSortedWithPredicate) {
+ EXPECT_FALSE(absl::c_is_sorted(sorted_, std::greater<int>()));
+ EXPECT_FALSE(absl::c_is_sorted(unsorted_, std::greater<int>()));
+ EXPECT_TRUE(absl::c_is_sorted(reversed_, std::greater<int>()));
+}
+
+TEST_F(SortingTest, IsSortedUntil) {
+ EXPECT_EQ(1, *absl::c_is_sorted_until(unsorted_));
+ EXPECT_EQ(4, *absl::c_is_sorted_until(unsorted_, std::greater<int>()));
+}
+
+TEST_F(SortingTest, NthElement) {
+ std::vector<int> unsorted = {2, 4, 1, 3};
+ absl::c_nth_element(unsorted, unsorted.begin() + 2);
+ EXPECT_THAT(unsorted, ElementsAre(Lt(3), Lt(3), 3, Gt(3)));
+ absl::c_nth_element(unsorted, unsorted.begin() + 2, std::greater<int>());
+ EXPECT_THAT(unsorted, ElementsAre(Gt(2), Gt(2), 2, Lt(2)));
+}
+
+TEST(MutatingTest, IsPartitioned) {
+ EXPECT_TRUE(
+ absl::c_is_partitioned(std::vector<int>{1, 3, 5, 2, 4, 6}, IsOdd));
+ EXPECT_FALSE(
+ absl::c_is_partitioned(std::vector<int>{1, 2, 3, 4, 5, 6}, IsOdd));
+ EXPECT_FALSE(
+ absl::c_is_partitioned(std::vector<int>{2, 4, 6, 1, 3, 5}, IsOdd));
+}
+
+TEST(MutatingTest, Partition) {
+ std::vector<int> actual = {1, 2, 3, 4, 5};
+ absl::c_partition(actual, IsOdd);
+ EXPECT_THAT(actual, Truly([](const std::vector<int>& c) {
+ return absl::c_is_partitioned(c, IsOdd);
+ }));
+}
+
+TEST(MutatingTest, StablePartition) {
+ std::vector<int> actual = {1, 2, 3, 4, 5};
+ absl::c_stable_partition(actual, IsOdd);
+ EXPECT_THAT(actual, ElementsAre(1, 3, 5, 2, 4));
+}
+
+TEST(MutatingTest, PartitionCopy) {
+ const std::vector<int> initial = {1, 2, 3, 4, 5};
+ std::vector<int> odds, evens;
+ auto ends = absl::c_partition_copy(initial, back_inserter(odds),
+ back_inserter(evens), IsOdd);
+ *ends.first = 7;
+ *ends.second = 6;
+ EXPECT_THAT(odds, ElementsAre(1, 3, 5, 7));
+ EXPECT_THAT(evens, ElementsAre(2, 4, 6));
+}
+
+TEST(MutatingTest, PartitionPoint) {
+ const std::vector<int> initial = {1, 3, 5, 2, 4};
+ auto middle = absl::c_partition_point(initial, IsOdd);
+ EXPECT_EQ(2, *middle);
+}
+
+TEST(MutatingTest, CopyMiddle) {
+ const std::vector<int> initial = {4, -1, -2, -3, 5};
+ const std::list<int> input = {1, 2, 3};
+ const std::vector<int> expected = {4, 1, 2, 3, 5};
+
+ std::list<int> test_list(initial.begin(), initial.end());
+ absl::c_copy(input, ++test_list.begin());
+ EXPECT_EQ(std::list<int>(expected.begin(), expected.end()), test_list);
+
+ std::vector<int> test_vector = initial;
+ absl::c_copy(input, test_vector.begin() + 1);
+ EXPECT_EQ(expected, test_vector);
+}
+
+TEST(MutatingTest, CopyFrontInserter) {
+ const std::list<int> initial = {4, 5};
+ const std::list<int> input = {1, 2, 3};
+ const std::list<int> expected = {3, 2, 1, 4, 5};
+
+ std::list<int> test_list = initial;
+ absl::c_copy(input, std::front_inserter(test_list));
+ EXPECT_EQ(expected, test_list);
+}
+
+TEST(MutatingTest, CopyBackInserter) {
+ const std::vector<int> initial = {4, 5};
+ const std::list<int> input = {1, 2, 3};
+ const std::vector<int> expected = {4, 5, 1, 2, 3};
+
+ std::list<int> test_list(initial.begin(), initial.end());
+ absl::c_copy(input, std::back_inserter(test_list));
+ EXPECT_EQ(std::list<int>(expected.begin(), expected.end()), test_list);
+
+ std::vector<int> test_vector = initial;
+ absl::c_copy(input, std::back_inserter(test_vector));
+ EXPECT_EQ(expected, test_vector);
+}
+
+TEST(MutatingTest, CopyN) {
+ const std::vector<int> initial = {1, 2, 3, 4, 5};
+ const std::vector<int> expected = {1, 2};
+ std::vector<int> actual;
+ absl::c_copy_n(initial, 2, back_inserter(actual));
+ EXPECT_EQ(expected, actual);
+}
+
+TEST(MutatingTest, CopyIf) {
+ const std::list<int> input = {1, 2, 3};
+ std::vector<int> output;
+ absl::c_copy_if(input, std::back_inserter(output),
+ [](int i) { return i != 2; });
+ EXPECT_THAT(output, ElementsAre(1, 3));
+}
+
+TEST(MutatingTest, CopyBackward) {
+ std::vector<int> actual = {1, 2, 3, 4, 5};
+ std::vector<int> expected = {1, 2, 1, 2, 3};
+ absl::c_copy_backward(absl::MakeSpan(actual.data(), 3), actual.end());
+ EXPECT_EQ(expected, actual);
+}
+
+TEST(MutatingTest, Move) {
+ std::vector<std::unique_ptr<int>> src;
+ src.emplace_back(absl::make_unique<int>(1));
+ src.emplace_back(absl::make_unique<int>(2));
+ src.emplace_back(absl::make_unique<int>(3));
+ src.emplace_back(absl::make_unique<int>(4));
+ src.emplace_back(absl::make_unique<int>(5));
+
+ std::vector<std::unique_ptr<int>> dest = {};
+ absl::c_move(src, std::back_inserter(dest));
+ EXPECT_THAT(src, Each(IsNull()));
+ EXPECT_THAT(dest, ElementsAre(Pointee(1), Pointee(2), Pointee(3), Pointee(4),
+ Pointee(5)));
+}
+
+TEST(MutatingTest, MoveBackward) {
+ std::vector<std::unique_ptr<int>> actual;
+ actual.emplace_back(absl::make_unique<int>(1));
+ actual.emplace_back(absl::make_unique<int>(2));
+ actual.emplace_back(absl::make_unique<int>(3));
+ actual.emplace_back(absl::make_unique<int>(4));
+ actual.emplace_back(absl::make_unique<int>(5));
+ auto subrange = absl::MakeSpan(actual.data(), 3);
+ absl::c_move_backward(subrange, actual.end());
+ EXPECT_THAT(actual, ElementsAre(IsNull(), IsNull(), Pointee(1), Pointee(2),
+ Pointee(3)));
+}
+
+TEST(MutatingTest, MoveWithRvalue) {
+ auto MakeRValueSrc = [] {
+ std::vector<std::unique_ptr<int>> src;
+ src.emplace_back(absl::make_unique<int>(1));
+ src.emplace_back(absl::make_unique<int>(2));
+ src.emplace_back(absl::make_unique<int>(3));
+ return src;
+ };
+
+ std::vector<std::unique_ptr<int>> dest = MakeRValueSrc();
+ absl::c_move(MakeRValueSrc(), std::back_inserter(dest));
+ EXPECT_THAT(dest, ElementsAre(Pointee(1), Pointee(2), Pointee(3), Pointee(1),
+ Pointee(2), Pointee(3)));
+}
+
+TEST(MutatingTest, SwapRanges) {
+ std::vector<int> odds = {2, 4, 6};
+ std::vector<int> evens = {1, 3, 5};
+ absl::c_swap_ranges(odds, evens);
+ EXPECT_THAT(odds, ElementsAre(1, 3, 5));
+ EXPECT_THAT(evens, ElementsAre(2, 4, 6));
+
+ odds.pop_back();
+ absl::c_swap_ranges(odds, evens);
+ EXPECT_THAT(odds, ElementsAre(2, 4));
+ EXPECT_THAT(evens, ElementsAre(1, 3, 6));
+
+ absl::c_swap_ranges(evens, odds);
+ EXPECT_THAT(odds, ElementsAre(1, 3));
+ EXPECT_THAT(evens, ElementsAre(2, 4, 6));
+}
+
+TEST_F(NonMutatingTest, Transform) {
+ std::vector<int> x{0, 2, 4}, y, z;
+ auto end = absl::c_transform(x, back_inserter(y), std::negate<int>());
+ EXPECT_EQ(std::vector<int>({0, -2, -4}), y);
+ *end = 7;
+ EXPECT_EQ(std::vector<int>({0, -2, -4, 7}), y);
+
+ y = {1, 3, 0};
+ end = absl::c_transform(x, y, back_inserter(z), std::plus<int>());
+ EXPECT_EQ(std::vector<int>({1, 5, 4}), z);
+ *end = 7;
+ EXPECT_EQ(std::vector<int>({1, 5, 4, 7}), z);
+
+ z.clear();
+ y.pop_back();
+ end = absl::c_transform(x, y, std::back_inserter(z), std::plus<int>());
+ EXPECT_EQ(std::vector<int>({1, 5}), z);
+ *end = 7;
+ EXPECT_EQ(std::vector<int>({1, 5, 7}), z);
+
+ z.clear();
+ std::swap(x, y);
+ end = absl::c_transform(x, y, std::back_inserter(z), std::plus<int>());
+ EXPECT_EQ(std::vector<int>({1, 5}), z);
+ *end = 7;
+ EXPECT_EQ(std::vector<int>({1, 5, 7}), z);
+}
+
+TEST(MutatingTest, Replace) {
+ const std::vector<int> initial = {1, 2, 3, 1, 4, 5};
+ const std::vector<int> expected = {4, 2, 3, 4, 4, 5};
+
+ std::vector<int> test_vector = initial;
+ absl::c_replace(test_vector, 1, 4);
+ EXPECT_EQ(expected, test_vector);
+
+ std::list<int> test_list(initial.begin(), initial.end());
+ absl::c_replace(test_list, 1, 4);
+ EXPECT_EQ(std::list<int>(expected.begin(), expected.end()), test_list);
+}
+
+TEST(MutatingTest, ReplaceIf) {
+ std::vector<int> actual = {1, 2, 3, 4, 5};
+ const std::vector<int> expected = {0, 2, 0, 4, 0};
+
+ absl::c_replace_if(actual, IsOdd, 0);
+ EXPECT_EQ(expected, actual);
+}
+
+TEST(MutatingTest, ReplaceCopy) {
+ const std::vector<int> initial = {1, 2, 3, 1, 4, 5};
+ const std::vector<int> expected = {4, 2, 3, 4, 4, 5};
+
+ std::vector<int> actual;
+ absl::c_replace_copy(initial, back_inserter(actual), 1, 4);
+ EXPECT_EQ(expected, actual);
+}
+
+TEST(MutatingTest, Sort) {
+ std::vector<int> test_vector = {2, 3, 1, 4};
+ absl::c_sort(test_vector);
+ EXPECT_THAT(test_vector, ElementsAre(1, 2, 3, 4));
+}
+
+TEST(MutatingTest, SortWithPredicate) {
+ std::vector<int> test_vector = {2, 3, 1, 4};
+ absl::c_sort(test_vector, std::greater<int>());
+ EXPECT_THAT(test_vector, ElementsAre(4, 3, 2, 1));
+}
+
+// For absl::c_stable_sort tests. Needs an operator< that does not cover all
+// fields so that the test can check the sort preserves order of equal elements.
+struct Element {
+ int key;
+ int value;
+ friend bool operator<(const Element& e1, const Element& e2) {
+ return e1.key < e2.key;
+ }
+ // Make gmock print useful diagnostics.
+ friend std::ostream& operator<<(std::ostream& o, const Element& e) {
+ return o << "{" << e.key << ", " << e.value << "}";
+ }
+};
+
+MATCHER_P2(IsElement, key, value, "") {
+ return arg.key == key && arg.value == value;
+}
+
+TEST(MutatingTest, StableSort) {
+ std::vector<Element> test_vector = {{1, 1}, {2, 1}, {2, 0}, {1, 0}, {2, 2}};
+ absl::c_stable_sort(test_vector);
+ EXPECT_THAT(test_vector,
+ ElementsAre(IsElement(1, 1), IsElement(1, 0), IsElement(2, 1),
+ IsElement(2, 0), IsElement(2, 2)));
+}
+
+TEST(MutatingTest, StableSortWithPredicate) {
+ std::vector<Element> test_vector = {{1, 1}, {2, 1}, {2, 0}, {1, 0}, {2, 2}};
+ absl::c_stable_sort(test_vector, [](const Element& e1, const Element& e2) {
+ return e2 < e1;
+ });
+ EXPECT_THAT(test_vector,
+ ElementsAre(IsElement(2, 1), IsElement(2, 0), IsElement(2, 2),
+ IsElement(1, 1), IsElement(1, 0)));
+}
+
+TEST(MutatingTest, ReplaceCopyIf) {
+ const std::vector<int> initial = {1, 2, 3, 4, 5};
+ const std::vector<int> expected = {0, 2, 0, 4, 0};
+
+ std::vector<int> actual;
+ absl::c_replace_copy_if(initial, back_inserter(actual), IsOdd, 0);
+ EXPECT_EQ(expected, actual);
+}
+
+TEST(MutatingTest, Fill) {
+ std::vector<int> actual(5);
+ absl::c_fill(actual, 1);
+ EXPECT_THAT(actual, ElementsAre(1, 1, 1, 1, 1));
+}
+
+TEST(MutatingTest, FillN) {
+ std::vector<int> actual(5, 0);
+ absl::c_fill_n(actual, 2, 1);
+ EXPECT_THAT(actual, ElementsAre(1, 1, 0, 0, 0));
+}
+
+TEST(MutatingTest, Generate) {
+ std::vector<int> actual(5);
+ int x = 0;
+ absl::c_generate(actual, [&x]() { return ++x; });
+ EXPECT_THAT(actual, ElementsAre(1, 2, 3, 4, 5));
+}
+
+TEST(MutatingTest, GenerateN) {
+ std::vector<int> actual(5, 0);
+ int x = 0;
+ absl::c_generate_n(actual, 3, [&x]() { return ++x; });
+ EXPECT_THAT(actual, ElementsAre(1, 2, 3, 0, 0));
+}
+
+TEST(MutatingTest, RemoveCopy) {
+ std::vector<int> actual;
+ absl::c_remove_copy(std::vector<int>{1, 2, 3}, back_inserter(actual), 2);
+ EXPECT_THAT(actual, ElementsAre(1, 3));
+}
+
+TEST(MutatingTest, RemoveCopyIf) {
+ std::vector<int> actual;
+ absl::c_remove_copy_if(std::vector<int>{1, 2, 3}, back_inserter(actual),
+ IsOdd);
+ EXPECT_THAT(actual, ElementsAre(2));
+}
+
+TEST(MutatingTest, UniqueCopy) {
+ std::vector<int> actual;
+ absl::c_unique_copy(std::vector<int>{1, 2, 2, 2, 3, 3, 2},
+ back_inserter(actual));
+ EXPECT_THAT(actual, ElementsAre(1, 2, 3, 2));
+}
+
+TEST(MutatingTest, UniqueCopyWithPredicate) {
+ std::vector<int> actual;
+ absl::c_unique_copy(std::vector<int>{1, 2, 3, -1, -2, -3, 1},
+ back_inserter(actual),
+ [](int x, int y) { return (x < 0) == (y < 0); });
+ EXPECT_THAT(actual, ElementsAre(1, -1, 1));
+}
+
+TEST(MutatingTest, Reverse) {
+ std::vector<int> test_vector = {1, 2, 3, 4};
+ absl::c_reverse(test_vector);
+ EXPECT_THAT(test_vector, ElementsAre(4, 3, 2, 1));
+
+ std::list<int> test_list = {1, 2, 3, 4};
+ absl::c_reverse(test_list);
+ EXPECT_THAT(test_list, ElementsAre(4, 3, 2, 1));
+}
+
+TEST(MutatingTest, ReverseCopy) {
+ std::vector<int> actual;
+ absl::c_reverse_copy(std::vector<int>{1, 2, 3, 4}, back_inserter(actual));
+ EXPECT_THAT(actual, ElementsAre(4, 3, 2, 1));
+}
+
+TEST(MutatingTest, Rotate) {
+ std::vector<int> actual = {1, 2, 3, 4};
+ auto it = absl::c_rotate(actual, actual.begin() + 2);
+ EXPECT_THAT(actual, testing::ElementsAreArray({3, 4, 1, 2}));
+ EXPECT_EQ(*it, 1);
+}
+
+TEST(MutatingTest, RotateCopy) {
+ std::vector<int> initial = {1, 2, 3, 4};
+ std::vector<int> actual;
+ auto end =
+ absl::c_rotate_copy(initial, initial.begin() + 2, back_inserter(actual));
+ *end = 5;
+ EXPECT_THAT(actual, ElementsAre(3, 4, 1, 2, 5));
+}
+
+TEST(MutatingTest, Shuffle) {
+ std::vector<int> actual = {1, 2, 3, 4, 5};
+ absl::c_shuffle(actual, std::random_device());
+ EXPECT_THAT(actual, UnorderedElementsAre(1, 2, 3, 4, 5));
+}
+
+TEST(MutatingTest, PartialSort) {
+ std::vector<int> sequence{5, 3, 42, 0};
+ absl::c_partial_sort(sequence, sequence.begin() + 2);
+ EXPECT_THAT(absl::MakeSpan(sequence.data(), 2), ElementsAre(0, 3));
+ absl::c_partial_sort(sequence, sequence.begin() + 2, std::greater<int>());
+ EXPECT_THAT(absl::MakeSpan(sequence.data(), 2), ElementsAre(42, 5));
+}
+
+TEST(MutatingTest, PartialSortCopy) {
+ const std::vector<int> initial = {5, 3, 42, 0};
+ std::vector<int> actual(2);
+ absl::c_partial_sort_copy(initial, actual);
+ EXPECT_THAT(actual, ElementsAre(0, 3));
+ absl::c_partial_sort_copy(initial, actual, std::greater<int>());
+ EXPECT_THAT(actual, ElementsAre(42, 5));
+}
+
+TEST(MutatingTest, Merge) {
+ std::vector<int> actual;
+ absl::c_merge(std::vector<int>{1, 3, 5}, std::vector<int>{2, 4},
+ back_inserter(actual));
+ EXPECT_THAT(actual, ElementsAre(1, 2, 3, 4, 5));
+}
+
+TEST(MutatingTest, MergeWithComparator) {
+ std::vector<int> actual;
+ absl::c_merge(std::vector<int>{5, 3, 1}, std::vector<int>{4, 2},
+ back_inserter(actual), std::greater<int>());
+ EXPECT_THAT(actual, ElementsAre(5, 4, 3, 2, 1));
+}
+
+TEST(MutatingTest, InplaceMerge) {
+ std::vector<int> actual = {1, 3, 5, 2, 4};
+ absl::c_inplace_merge(actual, actual.begin() + 3);
+ EXPECT_THAT(actual, ElementsAre(1, 2, 3, 4, 5));
+}
+
+TEST(MutatingTest, InplaceMergeWithComparator) {
+ std::vector<int> actual = {5, 3, 1, 4, 2};
+ absl::c_inplace_merge(actual, actual.begin() + 3, std::greater<int>());
+ EXPECT_THAT(actual, ElementsAre(5, 4, 3, 2, 1));
+}
+
+class SetOperationsTest : public testing::Test {
+ protected:
+ std::vector<int> a_ = {1, 2, 3};
+ std::vector<int> b_ = {1, 3, 5};
+
+ std::vector<int> a_reversed_ = {3, 2, 1};
+ std::vector<int> b_reversed_ = {5, 3, 1};
+};
+
+TEST_F(SetOperationsTest, SetUnion) {
+ std::vector<int> actual;
+ absl::c_set_union(a_, b_, back_inserter(actual));
+ EXPECT_THAT(actual, ElementsAre(1, 2, 3, 5));
+}
+
+TEST_F(SetOperationsTest, SetUnionWithComparator) {
+ std::vector<int> actual;
+ absl::c_set_union(a_reversed_, b_reversed_, back_inserter(actual),
+ std::greater<int>());
+ EXPECT_THAT(actual, ElementsAre(5, 3, 2, 1));
+}
+
+TEST_F(SetOperationsTest, SetIntersection) {
+ std::vector<int> actual;
+ absl::c_set_intersection(a_, b_, back_inserter(actual));
+ EXPECT_THAT(actual, ElementsAre(1, 3));
+}
+
+TEST_F(SetOperationsTest, SetIntersectionWithComparator) {
+ std::vector<int> actual;
+ absl::c_set_intersection(a_reversed_, b_reversed_, back_inserter(actual),
+ std::greater<int>());
+ EXPECT_THAT(actual, ElementsAre(3, 1));
+}
+
+TEST_F(SetOperationsTest, SetDifference) {
+ std::vector<int> actual;
+ absl::c_set_difference(a_, b_, back_inserter(actual));
+ EXPECT_THAT(actual, ElementsAre(2));
+}
+
+TEST_F(SetOperationsTest, SetDifferenceWithComparator) {
+ std::vector<int> actual;
+ absl::c_set_difference(a_reversed_, b_reversed_, back_inserter(actual),
+ std::greater<int>());
+ EXPECT_THAT(actual, ElementsAre(2));
+}
+
+TEST_F(SetOperationsTest, SetSymmetricDifference) {
+ std::vector<int> actual;
+ absl::c_set_symmetric_difference(a_, b_, back_inserter(actual));
+ EXPECT_THAT(actual, ElementsAre(2, 5));
+}
+
+TEST_F(SetOperationsTest, SetSymmetricDifferenceWithComparator) {
+ std::vector<int> actual;
+ absl::c_set_symmetric_difference(a_reversed_, b_reversed_,
+ back_inserter(actual), std::greater<int>());
+ EXPECT_THAT(actual, ElementsAre(5, 2));
+}
+
+TEST(HeapOperationsTest, WithoutComparator) {
+ std::vector<int> heap = {1, 2, 3};
+ EXPECT_FALSE(absl::c_is_heap(heap));
+ absl::c_make_heap(heap);
+ EXPECT_TRUE(absl::c_is_heap(heap));
+ heap.push_back(4);
+ EXPECT_EQ(3, absl::c_is_heap_until(heap) - heap.begin());
+ absl::c_push_heap(heap);
+ EXPECT_EQ(4, heap[0]);
+ absl::c_pop_heap(heap);
+ EXPECT_EQ(4, heap[3]);
+ absl::c_make_heap(heap);
+ absl::c_sort_heap(heap);
+ EXPECT_THAT(heap, ElementsAre(1, 2, 3, 4));
+ EXPECT_FALSE(absl::c_is_heap(heap));
+}
+
+TEST(HeapOperationsTest, WithComparator) {
+ using greater = std::greater<int>;
+ std::vector<int> heap = {3, 2, 1};
+ EXPECT_FALSE(absl::c_is_heap(heap, greater()));
+ absl::c_make_heap(heap, greater());
+ EXPECT_TRUE(absl::c_is_heap(heap, greater()));
+ heap.push_back(0);
+ EXPECT_EQ(3, absl::c_is_heap_until(heap, greater()) - heap.begin());
+ absl::c_push_heap(heap, greater());
+ EXPECT_EQ(0, heap[0]);
+ absl::c_pop_heap(heap, greater());
+ EXPECT_EQ(0, heap[3]);
+ absl::c_make_heap(heap, greater());
+ absl::c_sort_heap(heap, greater());
+ EXPECT_THAT(heap, ElementsAre(3, 2, 1, 0));
+ EXPECT_FALSE(absl::c_is_heap(heap, greater()));
+}
+
+TEST(MutatingTest, PermutationOperations) {
+ std::vector<int> initial = {1, 2, 3, 4};
+ std::vector<int> permuted = initial;
+
+ absl::c_next_permutation(permuted);
+ EXPECT_TRUE(absl::c_is_permutation(initial, permuted));
+ EXPECT_TRUE(absl::c_is_permutation(initial, permuted, std::equal_to<int>()));
+
+ std::vector<int> permuted2 = initial;
+ absl::c_prev_permutation(permuted2, std::greater<int>());
+ EXPECT_EQ(permuted, permuted2);
+
+ absl::c_prev_permutation(permuted);
+ EXPECT_EQ(initial, permuted);
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/algorithm/equal_benchmark.cc b/third_party/abseil/src/absl/algorithm/equal_benchmark.cc
new file mode 100644
index 0000000..7bf62c9
--- /dev/null
+++ b/third_party/abseil/src/absl/algorithm/equal_benchmark.cc
@@ -0,0 +1,126 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <cstdint>
+#include <cstring>
+
+#include "benchmark/benchmark.h"
+#include "absl/algorithm/algorithm.h"
+
+namespace {
+
+// The range of sequence sizes to benchmark.
+constexpr int kMinBenchmarkSize = 1024;
+constexpr int kMaxBenchmarkSize = 8 * 1024 * 1024;
+
+// A user-defined type for use in equality benchmarks. Note that we expect
+// std::memcmp to win for this type: libstdc++'s std::equal only defers to
+// memcmp for integral types. This is because it is not straightforward to
+// guarantee that std::memcmp would produce a result "as-if" compared by
+// operator== for other types (example gotchas: NaN floats, structs with
+// padding).
+struct EightBits {
+ explicit EightBits(int /* unused */) : data(0) {}
+ bool operator==(const EightBits& rhs) const { return data == rhs.data; }
+ uint8_t data;
+};
+
+template <typename T>
+void BM_absl_equal_benchmark(benchmark::State& state) {
+ std::vector<T> xs(state.range(0), T(0));
+ std::vector<T> ys = xs;
+ while (state.KeepRunning()) {
+ const bool same = absl::equal(xs.begin(), xs.end(), ys.begin(), ys.end());
+ benchmark::DoNotOptimize(same);
+ }
+}
+
+template <typename T>
+void BM_std_equal_benchmark(benchmark::State& state) {
+ std::vector<T> xs(state.range(0), T(0));
+ std::vector<T> ys = xs;
+ while (state.KeepRunning()) {
+ const bool same = std::equal(xs.begin(), xs.end(), ys.begin());
+ benchmark::DoNotOptimize(same);
+ }
+}
+
+template <typename T>
+void BM_memcmp_benchmark(benchmark::State& state) {
+ std::vector<T> xs(state.range(0), T(0));
+ std::vector<T> ys = xs;
+ while (state.KeepRunning()) {
+ const bool same =
+ std::memcmp(xs.data(), ys.data(), xs.size() * sizeof(T)) == 0;
+ benchmark::DoNotOptimize(same);
+ }
+}
+
+// The expectation is that the compiler should be able to elide the equality
+// comparison altogether for sufficiently simple types.
+template <typename T>
+void BM_absl_equal_self_benchmark(benchmark::State& state) {
+ std::vector<T> xs(state.range(0), T(0));
+ while (state.KeepRunning()) {
+ const bool same = absl::equal(xs.begin(), xs.end(), xs.begin(), xs.end());
+ benchmark::DoNotOptimize(same);
+ }
+}
+
+BENCHMARK_TEMPLATE(BM_absl_equal_benchmark, uint8_t)
+ ->Range(kMinBenchmarkSize, kMaxBenchmarkSize);
+BENCHMARK_TEMPLATE(BM_std_equal_benchmark, uint8_t)
+ ->Range(kMinBenchmarkSize, kMaxBenchmarkSize);
+BENCHMARK_TEMPLATE(BM_memcmp_benchmark, uint8_t)
+ ->Range(kMinBenchmarkSize, kMaxBenchmarkSize);
+BENCHMARK_TEMPLATE(BM_absl_equal_self_benchmark, uint8_t)
+ ->Range(kMinBenchmarkSize, kMaxBenchmarkSize);
+
+BENCHMARK_TEMPLATE(BM_absl_equal_benchmark, uint16_t)
+ ->Range(kMinBenchmarkSize, kMaxBenchmarkSize);
+BENCHMARK_TEMPLATE(BM_std_equal_benchmark, uint16_t)
+ ->Range(kMinBenchmarkSize, kMaxBenchmarkSize);
+BENCHMARK_TEMPLATE(BM_memcmp_benchmark, uint16_t)
+ ->Range(kMinBenchmarkSize, kMaxBenchmarkSize);
+BENCHMARK_TEMPLATE(BM_absl_equal_self_benchmark, uint16_t)
+ ->Range(kMinBenchmarkSize, kMaxBenchmarkSize);
+
+BENCHMARK_TEMPLATE(BM_absl_equal_benchmark, uint32_t)
+ ->Range(kMinBenchmarkSize, kMaxBenchmarkSize);
+BENCHMARK_TEMPLATE(BM_std_equal_benchmark, uint32_t)
+ ->Range(kMinBenchmarkSize, kMaxBenchmarkSize);
+BENCHMARK_TEMPLATE(BM_memcmp_benchmark, uint32_t)
+ ->Range(kMinBenchmarkSize, kMaxBenchmarkSize);
+BENCHMARK_TEMPLATE(BM_absl_equal_self_benchmark, uint32_t)
+ ->Range(kMinBenchmarkSize, kMaxBenchmarkSize);
+
+BENCHMARK_TEMPLATE(BM_absl_equal_benchmark, uint64_t)
+ ->Range(kMinBenchmarkSize, kMaxBenchmarkSize);
+BENCHMARK_TEMPLATE(BM_std_equal_benchmark, uint64_t)
+ ->Range(kMinBenchmarkSize, kMaxBenchmarkSize);
+BENCHMARK_TEMPLATE(BM_memcmp_benchmark, uint64_t)
+ ->Range(kMinBenchmarkSize, kMaxBenchmarkSize);
+BENCHMARK_TEMPLATE(BM_absl_equal_self_benchmark, uint64_t)
+ ->Range(kMinBenchmarkSize, kMaxBenchmarkSize);
+
+BENCHMARK_TEMPLATE(BM_absl_equal_benchmark, EightBits)
+ ->Range(kMinBenchmarkSize, kMaxBenchmarkSize);
+BENCHMARK_TEMPLATE(BM_std_equal_benchmark, EightBits)
+ ->Range(kMinBenchmarkSize, kMaxBenchmarkSize);
+BENCHMARK_TEMPLATE(BM_memcmp_benchmark, EightBits)
+ ->Range(kMinBenchmarkSize, kMaxBenchmarkSize);
+BENCHMARK_TEMPLATE(BM_absl_equal_self_benchmark, EightBits)
+ ->Range(kMinBenchmarkSize, kMaxBenchmarkSize);
+
+} // namespace
diff --git a/third_party/abseil/src/absl/base/BUILD.bazel b/third_party/abseil/src/absl/base/BUILD.bazel
new file mode 100644
index 0000000..9d96abe
--- /dev/null
+++ b/third_party/abseil/src/absl/base/BUILD.bazel
@@ -0,0 +1,818 @@
+#
+# Copyright 2017 The Abseil Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+load("@rules_cc//cc:defs.bzl", "cc_binary", "cc_library", "cc_test")
+load(
+ "//absl:copts/configure_copts.bzl",
+ "ABSL_DEFAULT_COPTS",
+ "ABSL_DEFAULT_LINKOPTS",
+ "ABSL_TEST_COPTS",
+)
+
+package(default_visibility = ["//visibility:public"])
+
+licenses(["notice"])
+
+cc_library(
+ name = "atomic_hook",
+ hdrs = ["internal/atomic_hook.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ visibility = [
+ "//absl:__subpackages__",
+ ],
+ deps = [
+ ":config",
+ ":core_headers",
+ ],
+)
+
+cc_library(
+ name = "errno_saver",
+ hdrs = ["internal/errno_saver.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ visibility = [
+ "//absl:__subpackages__",
+ ],
+ deps = [":config"],
+)
+
+cc_library(
+ name = "log_severity",
+ srcs = ["log_severity.cc"],
+ hdrs = ["log_severity.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":config",
+ ":core_headers",
+ ],
+)
+
+cc_library(
+ name = "raw_logging_internal",
+ srcs = ["internal/raw_logging.cc"],
+ hdrs = ["internal/raw_logging.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ visibility = [
+ "//absl:__subpackages__",
+ ],
+ deps = [
+ ":atomic_hook",
+ ":config",
+ ":core_headers",
+ ":log_severity",
+ ],
+)
+
+cc_library(
+ name = "spinlock_wait",
+ srcs = [
+ "internal/spinlock_akaros.inc",
+ "internal/spinlock_linux.inc",
+ "internal/spinlock_posix.inc",
+ "internal/spinlock_wait.cc",
+ "internal/spinlock_win32.inc",
+ ],
+ hdrs = ["internal/spinlock_wait.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ visibility = [
+ "//absl/base:__pkg__",
+ ],
+ deps = [
+ ":base_internal",
+ ":core_headers",
+ ":errno_saver",
+ ],
+)
+
+cc_library(
+ name = "config",
+ hdrs = [
+ "config.h",
+ "options.h",
+ "policy_checks.h",
+ ],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+)
+
+cc_library(
+ name = "dynamic_annotations",
+ srcs = [
+ "internal/dynamic_annotations.h",
+ ],
+ hdrs = [
+ "dynamic_annotations.h",
+ ],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":config",
+ ":core_headers",
+ ],
+)
+
+cc_library(
+ name = "core_headers",
+ srcs = [
+ "internal/thread_annotations.h",
+ ],
+ hdrs = [
+ "attributes.h",
+ "const_init.h",
+ "macros.h",
+ "optimization.h",
+ "port.h",
+ "thread_annotations.h",
+ ],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":config",
+ ],
+)
+
+cc_library(
+ name = "malloc_internal",
+ srcs = [
+ "internal/low_level_alloc.cc",
+ ],
+ hdrs = [
+ "internal/direct_mmap.h",
+ "internal/low_level_alloc.h",
+ ],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = select({
+ "//absl:windows": [],
+ "//absl:wasm": [],
+ "//conditions:default": ["-pthread"],
+ }) + ABSL_DEFAULT_LINKOPTS,
+ visibility = [
+ "//visibility:public",
+ ],
+ deps = [
+ ":base",
+ ":base_internal",
+ ":config",
+ ":core_headers",
+ ":dynamic_annotations",
+ ":raw_logging_internal",
+ ],
+)
+
+cc_library(
+ name = "base_internal",
+ hdrs = [
+ "internal/hide_ptr.h",
+ "internal/identity.h",
+ "internal/inline_variable.h",
+ "internal/invoke.h",
+ "internal/scheduling_mode.h",
+ ],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ visibility = [
+ "//absl:__subpackages__",
+ ],
+ deps = [
+ ":config",
+ "//absl/meta:type_traits",
+ ],
+)
+
+cc_library(
+ name = "base",
+ srcs = [
+ "internal/cycleclock.cc",
+ "internal/spinlock.cc",
+ "internal/sysinfo.cc",
+ "internal/thread_identity.cc",
+ "internal/unscaledcycleclock.cc",
+ ],
+ hdrs = [
+ "call_once.h",
+ "casts.h",
+ "internal/cycleclock.h",
+ "internal/low_level_scheduling.h",
+ "internal/per_thread_tls.h",
+ "internal/spinlock.h",
+ "internal/sysinfo.h",
+ "internal/thread_identity.h",
+ "internal/tsan_mutex_interface.h",
+ "internal/unscaledcycleclock.h",
+ ],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = select({
+ "//absl:windows": [
+ "-DEFAULTLIB:advapi32.lib",
+ ],
+ "//absl:wasm": [],
+ "//conditions:default": ["-pthread"],
+ }) + ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":atomic_hook",
+ ":base_internal",
+ ":config",
+ ":core_headers",
+ ":dynamic_annotations",
+ ":log_severity",
+ ":raw_logging_internal",
+ ":spinlock_wait",
+ "//absl/meta:type_traits",
+ ],
+)
+
+cc_library(
+ name = "atomic_hook_test_helper",
+ testonly = 1,
+ srcs = ["internal/atomic_hook_test_helper.cc"],
+ hdrs = ["internal/atomic_hook_test_helper.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":atomic_hook",
+ ":core_headers",
+ ],
+)
+
+cc_test(
+ name = "atomic_hook_test",
+ size = "small",
+ srcs = ["internal/atomic_hook_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":atomic_hook",
+ ":atomic_hook_test_helper",
+ ":core_headers",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "bit_cast_test",
+ size = "small",
+ srcs = [
+ "bit_cast_test.cc",
+ ],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":base",
+ ":core_headers",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_library(
+ name = "throw_delegate",
+ srcs = ["internal/throw_delegate.cc"],
+ hdrs = ["internal/throw_delegate.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ visibility = [
+ "//absl:__subpackages__",
+ ],
+ deps = [
+ ":config",
+ ":raw_logging_internal",
+ ],
+)
+
+cc_test(
+ name = "throw_delegate_test",
+ srcs = ["throw_delegate_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":config",
+ ":throw_delegate",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "errno_saver_test",
+ size = "small",
+ srcs = ["internal/errno_saver_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":errno_saver",
+ ":strerror",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_library(
+ name = "exception_testing",
+ testonly = 1,
+ hdrs = ["internal/exception_testing.h"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ visibility = [
+ "//absl:__subpackages__",
+ ],
+ deps = [
+ ":config",
+ "@com_google_googletest//:gtest",
+ ],
+)
+
+cc_library(
+ name = "pretty_function",
+ hdrs = ["internal/pretty_function.h"],
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ visibility = ["//absl:__subpackages__"],
+)
+
+cc_library(
+ name = "exception_safety_testing",
+ testonly = 1,
+ srcs = ["internal/exception_safety_testing.cc"],
+ hdrs = ["internal/exception_safety_testing.h"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":config",
+ ":pretty_function",
+ "//absl/memory",
+ "//absl/meta:type_traits",
+ "//absl/strings",
+ "//absl/utility",
+ "@com_google_googletest//:gtest",
+ ],
+)
+
+cc_test(
+ name = "exception_safety_testing_test",
+ srcs = ["exception_safety_testing_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":exception_safety_testing",
+ "//absl/memory",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "inline_variable_test",
+ size = "small",
+ srcs = [
+ "inline_variable_test.cc",
+ "inline_variable_test_a.cc",
+ "inline_variable_test_b.cc",
+ "internal/inline_variable_testing.h",
+ ],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":base_internal",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "invoke_test",
+ size = "small",
+ srcs = ["invoke_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":base_internal",
+ "//absl/memory",
+ "//absl/strings",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+# Common test library made available for use in non-absl code that overrides
+# AbslInternalSpinLockDelay and AbslInternalSpinLockWake.
+cc_library(
+ name = "spinlock_test_common",
+ testonly = 1,
+ srcs = ["spinlock_test_common.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":base",
+ ":base_internal",
+ ":config",
+ ":core_headers",
+ "//absl/synchronization",
+ "@com_google_googletest//:gtest",
+ ],
+ alwayslink = 1,
+)
+
+cc_test(
+ name = "spinlock_test",
+ size = "medium",
+ srcs = ["spinlock_test_common.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":base",
+ ":base_internal",
+ ":config",
+ ":core_headers",
+ "//absl/synchronization",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_library(
+ name = "spinlock_benchmark_common",
+ testonly = 1,
+ srcs = ["internal/spinlock_benchmark.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ visibility = [
+ "//absl/base:__pkg__",
+ ],
+ deps = [
+ ":base",
+ ":base_internal",
+ ":raw_logging_internal",
+ "//absl/synchronization",
+ "@com_github_google_benchmark//:benchmark_main",
+ ],
+ alwayslink = 1,
+)
+
+cc_binary(
+ name = "spinlock_benchmark",
+ testonly = 1,
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ tags = ["benchmark"],
+ visibility = ["//visibility:private"],
+ deps = [
+ ":spinlock_benchmark_common",
+ ],
+)
+
+cc_library(
+ name = "endian",
+ hdrs = [
+ "internal/endian.h",
+ "internal/unaligned_access.h",
+ ],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":config",
+ ":core_headers",
+ ],
+)
+
+cc_test(
+ name = "endian_test",
+ srcs = ["internal/endian_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ deps = [
+ ":config",
+ ":endian",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "config_test",
+ srcs = ["config_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":config",
+ "//absl/synchronization:thread_pool",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "call_once_test",
+ srcs = ["call_once_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":base",
+ ":core_headers",
+ "//absl/synchronization",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "raw_logging_test",
+ srcs = ["raw_logging_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":raw_logging_internal",
+ "//absl/strings",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "sysinfo_test",
+ size = "small",
+ srcs = ["internal/sysinfo_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":base",
+ "//absl/synchronization",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "low_level_alloc_test",
+ size = "medium",
+ srcs = ["internal/low_level_alloc_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ tags = ["no_test_ios_x86_64"],
+ deps = [
+ ":malloc_internal",
+ "//absl/container:node_hash_map",
+ ],
+)
+
+cc_test(
+ name = "thread_identity_test",
+ size = "small",
+ srcs = ["internal/thread_identity_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":base",
+ ":core_headers",
+ "//absl/synchronization",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "thread_identity_benchmark",
+ srcs = ["internal/thread_identity_benchmark.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ tags = ["benchmark"],
+ visibility = ["//visibility:private"],
+ deps = [
+ ":base",
+ "//absl/synchronization",
+ "@com_github_google_benchmark//:benchmark_main",
+ ],
+)
+
+cc_library(
+ name = "bits",
+ hdrs = ["internal/bits.h"],
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ visibility = [
+ "//absl:__subpackages__",
+ ],
+ deps = [
+ ":config",
+ ":core_headers",
+ ],
+)
+
+cc_test(
+ name = "bits_test",
+ size = "small",
+ srcs = ["internal/bits_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":bits",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_library(
+ name = "exponential_biased",
+ srcs = ["internal/exponential_biased.cc"],
+ hdrs = ["internal/exponential_biased.h"],
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ visibility = [
+ "//absl:__subpackages__",
+ ],
+ deps = [
+ ":config",
+ ":core_headers",
+ ],
+)
+
+cc_test(
+ name = "exponential_biased_test",
+ size = "small",
+ srcs = ["internal/exponential_biased_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ visibility = ["//visibility:private"],
+ deps = [
+ ":exponential_biased",
+ "//absl/strings",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_library(
+ name = "periodic_sampler",
+ srcs = ["internal/periodic_sampler.cc"],
+ hdrs = ["internal/periodic_sampler.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":core_headers",
+ ":exponential_biased",
+ ],
+)
+
+cc_test(
+ name = "periodic_sampler_test",
+ size = "small",
+ srcs = ["internal/periodic_sampler_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ visibility = ["//visibility:private"],
+ deps = [
+ ":core_headers",
+ ":periodic_sampler",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_binary(
+ name = "periodic_sampler_benchmark",
+ testonly = 1,
+ srcs = ["internal/periodic_sampler_benchmark.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ tags = ["benchmark"],
+ visibility = ["//visibility:private"],
+ deps = [
+ ":core_headers",
+ ":periodic_sampler",
+ "@com_github_google_benchmark//:benchmark_main",
+ ],
+)
+
+cc_library(
+ name = "scoped_set_env",
+ testonly = 1,
+ srcs = ["internal/scoped_set_env.cc"],
+ hdrs = ["internal/scoped_set_env.h"],
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ visibility = [
+ "//absl:__subpackages__",
+ ],
+ deps = [
+ ":config",
+ ":raw_logging_internal",
+ ],
+)
+
+cc_test(
+ name = "scoped_set_env_test",
+ size = "small",
+ srcs = ["internal/scoped_set_env_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":scoped_set_env",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "log_severity_test",
+ size = "small",
+ srcs = ["log_severity_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":log_severity",
+ "//absl/flags:flag_internal",
+ "//absl/flags:marshalling",
+ "//absl/strings",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_library(
+ name = "strerror",
+ srcs = ["internal/strerror.cc"],
+ hdrs = ["internal/strerror.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ visibility = [
+ "//absl:__subpackages__",
+ ],
+ deps = [
+ ":config",
+ ":core_headers",
+ ":errno_saver",
+ ],
+)
+
+cc_test(
+ name = "strerror_test",
+ size = "small",
+ srcs = ["internal/strerror_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":strerror",
+ "//absl/strings",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_binary(
+ name = "strerror_benchmark",
+ testonly = 1,
+ srcs = ["internal/strerror_benchmark.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ tags = ["benchmark"],
+ visibility = ["//visibility:private"],
+ deps = [
+ ":strerror",
+ "@com_github_google_benchmark//:benchmark_main",
+ ],
+)
+
+cc_library(
+ name = "fast_type_id",
+ hdrs = ["internal/fast_type_id.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ visibility = [
+ "//absl:__subpackages__",
+ ],
+ deps = [
+ ":config",
+ ],
+)
+
+cc_test(
+ name = "fast_type_id_test",
+ size = "small",
+ srcs = ["internal/fast_type_id_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":fast_type_id",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "unique_small_name_test",
+ size = "small",
+ srcs = ["internal/unique_small_name_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ linkstatic = 1,
+ deps = [
+ ":core_headers",
+ "//absl/strings",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "optimization_test",
+ size = "small",
+ srcs = ["optimization_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":core_headers",
+ "//absl/types:optional",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
diff --git a/third_party/abseil/src/absl/base/CMakeLists.txt b/third_party/abseil/src/absl/base/CMakeLists.txt
new file mode 100644
index 0000000..9ff5aa2
--- /dev/null
+++ b/third_party/abseil/src/absl/base/CMakeLists.txt
@@ -0,0 +1,717 @@
+#
+# Copyright 2017 The Abseil Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+find_library(LIBRT rt)
+
+absl_cc_library(
+ NAME
+ atomic_hook
+ HDRS
+ "internal/atomic_hook.h"
+ DEPS
+ absl::config
+ absl::core_headers
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+)
+
+absl_cc_library(
+ NAME
+ errno_saver
+ HDRS
+ "internal/errno_saver.h"
+ DEPS
+ absl::config
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+)
+
+absl_cc_library(
+ NAME
+ log_severity
+ HDRS
+ "log_severity.h"
+ SRCS
+ "log_severity.cc"
+ DEPS
+ absl::core_headers
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+)
+
+absl_cc_library(
+ NAME
+ raw_logging_internal
+ HDRS
+ "internal/raw_logging.h"
+ SRCS
+ "internal/raw_logging.cc"
+ DEPS
+ absl::atomic_hook
+ absl::config
+ absl::core_headers
+ absl::log_severity
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+)
+
+absl_cc_library(
+ NAME
+ spinlock_wait
+ HDRS
+ "internal/spinlock_wait.h"
+ SRCS
+ "internal/spinlock_akaros.inc"
+ "internal/spinlock_linux.inc"
+ "internal/spinlock_posix.inc"
+ "internal/spinlock_wait.cc"
+ "internal/spinlock_win32.inc"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::base_internal
+ absl::core_headers
+ absl::errno_saver
+)
+
+absl_cc_library(
+ NAME
+ config
+ HDRS
+ "config.h"
+ "options.h"
+ "policy_checks.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ PUBLIC
+)
+
+absl_cc_library(
+ NAME
+ dynamic_annotations
+ HDRS
+ "dynamic_annotations.h"
+ SRCS
+ "internal/dynamic_annotations.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::config
+ PUBLIC
+)
+
+absl_cc_library(
+ NAME
+ core_headers
+ HDRS
+ "attributes.h"
+ "const_init.h"
+ "macros.h"
+ "optimization.h"
+ "port.h"
+ "thread_annotations.h"
+ "internal/thread_annotations.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::config
+ PUBLIC
+)
+
+absl_cc_library(
+ NAME
+ malloc_internal
+ HDRS
+ "internal/direct_mmap.h"
+ "internal/low_level_alloc.h"
+ SRCS
+ "internal/low_level_alloc.cc"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::base
+ absl::base_internal
+ absl::config
+ absl::core_headers
+ absl::dynamic_annotations
+ absl::raw_logging_internal
+ Threads::Threads
+)
+
+absl_cc_library(
+ NAME
+ base_internal
+ HDRS
+ "internal/hide_ptr.h"
+ "internal/identity.h"
+ "internal/inline_variable.h"
+ "internal/invoke.h"
+ "internal/scheduling_mode.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::config
+ absl::type_traits
+)
+
+absl_cc_library(
+ NAME
+ base
+ HDRS
+ "call_once.h"
+ "casts.h"
+ "internal/cycleclock.h"
+ "internal/low_level_scheduling.h"
+ "internal/per_thread_tls.h"
+ "internal/spinlock.h"
+ "internal/sysinfo.h"
+ "internal/thread_identity.h"
+ "internal/tsan_mutex_interface.h"
+ "internal/unscaledcycleclock.h"
+ SRCS
+ "internal/cycleclock.cc"
+ "internal/spinlock.cc"
+ "internal/sysinfo.cc"
+ "internal/thread_identity.cc"
+ "internal/unscaledcycleclock.cc"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ $<$<BOOL:${LIBRT}>:-lrt>
+ $<$<BOOL:${MINGW}>:"advapi32">
+ DEPS
+ absl::atomic_hook
+ absl::base_internal
+ absl::config
+ absl::core_headers
+ absl::dynamic_annotations
+ absl::log_severity
+ absl::raw_logging_internal
+ absl::spinlock_wait
+ absl::type_traits
+ Threads::Threads
+ PUBLIC
+)
+
+absl_cc_library(
+ NAME
+ throw_delegate
+ HDRS
+ "internal/throw_delegate.h"
+ SRCS
+ "internal/throw_delegate.cc"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::config
+ absl::raw_logging_internal
+)
+
+absl_cc_library(
+ NAME
+ exception_testing
+ HDRS
+ "internal/exception_testing.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::config
+ gtest
+ TESTONLY
+)
+
+absl_cc_library(
+ NAME
+ pretty_function
+ HDRS
+ "internal/pretty_function.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+)
+
+absl_cc_library(
+ NAME
+ exception_safety_testing
+ HDRS
+ "internal/exception_safety_testing.h"
+ SRCS
+ "internal/exception_safety_testing.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::config
+ absl::pretty_function
+ absl::memory
+ absl::meta
+ absl::strings
+ absl::utility
+ gtest
+ TESTONLY
+)
+
+absl_cc_test(
+ NAME
+ absl_exception_safety_testing_test
+ SRCS
+ "exception_safety_testing_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::exception_safety_testing
+ absl::memory
+ gtest_main
+)
+
+absl_cc_library(
+ NAME
+ atomic_hook_test_helper
+ SRCS
+ "internal/atomic_hook_test_helper.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::atomic_hook
+ absl::core_headers
+ TESTONLY
+)
+
+absl_cc_test(
+ NAME
+ atomic_hook_test
+ SRCS
+ "internal/atomic_hook_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::atomic_hook_test_helper
+ absl::atomic_hook
+ absl::core_headers
+ gmock
+ gtest_main
+)
+
+absl_cc_test(
+ NAME
+ bit_cast_test
+ SRCS
+ "bit_cast_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::base
+ absl::core_headers
+ gtest_main
+)
+
+absl_cc_test(
+ NAME
+ errno_saver_test
+ SRCS
+ "internal/errno_saver_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::errno_saver
+ absl::strerror
+ gmock
+ gtest_main
+)
+
+absl_cc_test(
+ NAME
+ throw_delegate_test
+ SRCS
+ "throw_delegate_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::base
+ absl::config
+ absl::throw_delegate
+ gtest_main
+)
+
+absl_cc_test(
+ NAME
+ inline_variable_test
+ SRCS
+ "internal/inline_variable_testing.h"
+ "inline_variable_test.cc"
+ "inline_variable_test_a.cc"
+ "inline_variable_test_b.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::base_internal
+ gtest_main
+)
+
+absl_cc_test(
+ NAME
+ invoke_test
+ SRCS
+ "invoke_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::base_internal
+ absl::memory
+ absl::strings
+ gmock
+ gtest_main
+)
+
+absl_cc_library(
+ NAME
+ spinlock_test_common
+ SRCS
+ "spinlock_test_common.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::base
+ absl::config
+ absl::base_internal
+ absl::core_headers
+ absl::synchronization
+ gtest
+ TESTONLY
+)
+
+# On bazel BUILD this target use "alwayslink = 1" which is not implemented here
+absl_cc_test(
+ NAME
+ spinlock_test
+ SRCS
+ "spinlock_test_common.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::base
+ absl::base_internal
+ absl::config
+ absl::core_headers
+ absl::synchronization
+ gtest_main
+)
+
+absl_cc_library(
+ NAME
+ endian
+ HDRS
+ "internal/endian.h"
+ "internal/unaligned_access.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::config
+ absl::core_headers
+ PUBLIC
+)
+
+absl_cc_test(
+ NAME
+ endian_test
+ SRCS
+ "internal/endian_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::base
+ absl::config
+ absl::endian
+ gtest_main
+)
+
+absl_cc_test(
+ NAME
+ config_test
+ SRCS
+ "config_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::config
+ absl::synchronization
+ gtest_main
+)
+
+absl_cc_test(
+ NAME
+ call_once_test
+ SRCS
+ "call_once_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::base
+ absl::core_headers
+ absl::synchronization
+ gtest_main
+)
+
+absl_cc_test(
+ NAME
+ raw_logging_test
+ SRCS
+ "raw_logging_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::raw_logging_internal
+ absl::strings
+ gtest_main
+)
+
+absl_cc_test(
+ NAME
+ sysinfo_test
+ SRCS
+ "internal/sysinfo_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::base
+ absl::synchronization
+ gtest_main
+)
+
+absl_cc_test(
+ NAME
+ low_level_alloc_test
+ SRCS
+ "internal/low_level_alloc_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::malloc_internal
+ absl::node_hash_map
+ Threads::Threads
+)
+
+absl_cc_test(
+ NAME
+ thread_identity_test
+ SRCS
+ "internal/thread_identity_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::base
+ absl::core_headers
+ absl::synchronization
+ Threads::Threads
+ gtest_main
+)
+
+absl_cc_library(
+ NAME
+ bits
+ HDRS
+ "internal/bits.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::config
+ absl::core_headers
+)
+
+absl_cc_test(
+ NAME
+ bits_test
+ SRCS
+ "internal/bits_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::bits
+ gtest_main
+)
+
+absl_cc_library(
+ NAME
+ exponential_biased
+ SRCS
+ "internal/exponential_biased.cc"
+ HDRS
+ "internal/exponential_biased.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::config
+ absl::core_headers
+)
+
+absl_cc_test(
+ NAME
+ exponential_biased_test
+ SRCS
+ "internal/exponential_biased_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::exponential_biased
+ absl::strings
+ gmock_main
+)
+
+absl_cc_library(
+ NAME
+ periodic_sampler
+ SRCS
+ "internal/periodic_sampler.cc"
+ HDRS
+ "internal/periodic_sampler.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::core_headers
+ absl::exponential_biased
+)
+
+absl_cc_test(
+ NAME
+ periodic_sampler_test
+ SRCS
+ "internal/periodic_sampler_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::core_headers
+ absl::periodic_sampler
+ gmock_main
+)
+
+absl_cc_library(
+ NAME
+ scoped_set_env
+ SRCS
+ "internal/scoped_set_env.cc"
+ HDRS
+ "internal/scoped_set_env.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::config
+ absl::raw_logging_internal
+)
+
+absl_cc_test(
+ NAME
+ scoped_set_env_test
+ SRCS
+ "internal/scoped_set_env_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::scoped_set_env
+ gtest_main
+)
+
+absl_cc_test(
+ NAME
+ cmake_thread_test
+ SRCS
+ "internal/cmake_thread_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::base
+)
+
+absl_cc_test(
+ NAME
+ log_severity_test
+ SRCS
+ "log_severity_test.cc"
+ DEPS
+ absl::flags_internal
+ absl::flags_marshalling
+ absl::log_severity
+ absl::strings
+ gmock
+ gtest_main
+)
+
+absl_cc_library(
+ NAME
+ strerror
+ SRCS
+ "internal/strerror.cc"
+ HDRS
+ "internal/strerror.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::config
+ absl::core_headers
+ absl::errno_saver
+)
+
+absl_cc_test(
+ NAME
+ strerror_test
+ SRCS
+ "internal/strerror_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::strerror
+ absl::strings
+ gmock
+ gtest_main
+)
+
+absl_cc_library(
+ NAME
+ fast_type_id
+ HDRS
+ "internal/fast_type_id.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::config
+)
+
+absl_cc_test(
+ NAME
+ fast_type_id_test
+ SRCS
+ "internal/fast_type_id_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::fast_type_id
+ gtest_main
+)
+
+absl_cc_test(
+ NAME
+ optimization_test
+ SRCS
+ "optimization_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::core_headers
+ absl::optional
+ gtest_main
+)
diff --git a/third_party/abseil/src/absl/base/attributes.h b/third_party/abseil/src/absl/base/attributes.h
new file mode 100644
index 0000000..f1d3cfe
--- /dev/null
+++ b/third_party/abseil/src/absl/base/attributes.h
@@ -0,0 +1,683 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// This header file defines macros for declaring attributes for functions,
+// types, and variables.
+//
+// These macros are used within Abseil and allow the compiler to optimize, where
+// applicable, certain function calls.
+//
+// This file is used for both C and C++!
+//
+// Most macros here are exposing GCC or Clang features, and are stubbed out for
+// other compilers.
+//
+// GCC attributes documentation:
+// https://gcc.gnu.org/onlinedocs/gcc-4.7.0/gcc/Function-Attributes.html
+// https://gcc.gnu.org/onlinedocs/gcc-4.7.0/gcc/Variable-Attributes.html
+// https://gcc.gnu.org/onlinedocs/gcc-4.7.0/gcc/Type-Attributes.html
+//
+// Most attributes in this file are already supported by GCC 4.7. However, some
+// of them are not supported in older version of Clang. Thus, we check
+// `__has_attribute()` first. If the check fails, we check if we are on GCC and
+// assume the attribute exists on GCC (which is verified on GCC 4.7).
+
+#ifndef ABSL_BASE_ATTRIBUTES_H_
+#define ABSL_BASE_ATTRIBUTES_H_
+
+#include "absl/base/config.h"
+
+// ABSL_HAVE_ATTRIBUTE
+//
+// A function-like feature checking macro that is a wrapper around
+// `__has_attribute`, which is defined by GCC 5+ and Clang and evaluates to a
+// nonzero constant integer if the attribute is supported or 0 if not.
+//
+// It evaluates to zero if `__has_attribute` is not defined by the compiler.
+//
+// GCC: https://gcc.gnu.org/gcc-5/changes.html
+// Clang: https://clang.llvm.org/docs/LanguageExtensions.html
+#ifdef __has_attribute
+#define ABSL_HAVE_ATTRIBUTE(x) __has_attribute(x)
+#else
+#define ABSL_HAVE_ATTRIBUTE(x) 0
+#endif
+
+// ABSL_HAVE_CPP_ATTRIBUTE
+//
+// A function-like feature checking macro that accepts C++11 style attributes.
+// It's a wrapper around `__has_cpp_attribute`, defined by ISO C++ SD-6
+// (https://en.cppreference.com/w/cpp/experimental/feature_test). If we don't
+// find `__has_cpp_attribute`, will evaluate to 0.
+#if defined(__cplusplus) && defined(__has_cpp_attribute)
+// NOTE: requiring __cplusplus above should not be necessary, but
+// works around https://bugs.llvm.org/show_bug.cgi?id=23435.
+#define ABSL_HAVE_CPP_ATTRIBUTE(x) __has_cpp_attribute(x)
+#else
+#define ABSL_HAVE_CPP_ATTRIBUTE(x) 0
+#endif
+
+// -----------------------------------------------------------------------------
+// Function Attributes
+// -----------------------------------------------------------------------------
+//
+// GCC: https://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html
+// Clang: https://clang.llvm.org/docs/AttributeReference.html
+
+// ABSL_PRINTF_ATTRIBUTE
+// ABSL_SCANF_ATTRIBUTE
+//
+// Tells the compiler to perform `printf` format string checking if the
+// compiler supports it; see the 'format' attribute in
+// <https://gcc.gnu.org/onlinedocs/gcc-4.7.0/gcc/Function-Attributes.html>.
+//
+// Note: As the GCC manual states, "[s]ince non-static C++ methods
+// have an implicit 'this' argument, the arguments of such methods
+// should be counted from two, not one."
+#if ABSL_HAVE_ATTRIBUTE(format) || (defined(__GNUC__) && !defined(__clang__))
+#define ABSL_PRINTF_ATTRIBUTE(string_index, first_to_check) \
+ __attribute__((__format__(__printf__, string_index, first_to_check)))
+#define ABSL_SCANF_ATTRIBUTE(string_index, first_to_check) \
+ __attribute__((__format__(__scanf__, string_index, first_to_check)))
+#else
+#define ABSL_PRINTF_ATTRIBUTE(string_index, first_to_check)
+#define ABSL_SCANF_ATTRIBUTE(string_index, first_to_check)
+#endif
+
+// ABSL_ATTRIBUTE_ALWAYS_INLINE
+// ABSL_ATTRIBUTE_NOINLINE
+//
+// Forces functions to either inline or not inline. Introduced in gcc 3.1.
+#if ABSL_HAVE_ATTRIBUTE(always_inline) || \
+ (defined(__GNUC__) && !defined(__clang__))
+#define ABSL_ATTRIBUTE_ALWAYS_INLINE __attribute__((always_inline))
+#define ABSL_HAVE_ATTRIBUTE_ALWAYS_INLINE 1
+#else
+#define ABSL_ATTRIBUTE_ALWAYS_INLINE
+#endif
+
+#if ABSL_HAVE_ATTRIBUTE(noinline) || (defined(__GNUC__) && !defined(__clang__))
+#define ABSL_ATTRIBUTE_NOINLINE __attribute__((noinline))
+#define ABSL_HAVE_ATTRIBUTE_NOINLINE 1
+#else
+#define ABSL_ATTRIBUTE_NOINLINE
+#endif
+
+// ABSL_ATTRIBUTE_NO_TAIL_CALL
+//
+// Prevents the compiler from optimizing away stack frames for functions which
+// end in a call to another function.
+#if ABSL_HAVE_ATTRIBUTE(disable_tail_calls)
+#define ABSL_HAVE_ATTRIBUTE_NO_TAIL_CALL 1
+#define ABSL_ATTRIBUTE_NO_TAIL_CALL __attribute__((disable_tail_calls))
+#elif defined(__GNUC__) && !defined(__clang__)
+#define ABSL_HAVE_ATTRIBUTE_NO_TAIL_CALL 1
+#define ABSL_ATTRIBUTE_NO_TAIL_CALL \
+ __attribute__((optimize("no-optimize-sibling-calls")))
+#else
+#define ABSL_ATTRIBUTE_NO_TAIL_CALL
+#define ABSL_HAVE_ATTRIBUTE_NO_TAIL_CALL 0
+#endif
+
+// ABSL_ATTRIBUTE_WEAK
+//
+// Tags a function as weak for the purposes of compilation and linking.
+// Weak attributes currently do not work properly in LLVM's Windows backend,
+// so disable them there. See https://bugs.llvm.org/show_bug.cgi?id=37598
+// for further information.
+// The MinGW compiler doesn't complain about the weak attribute until the link
+// step, presumably because Windows doesn't use ELF binaries.
+#if (ABSL_HAVE_ATTRIBUTE(weak) || \
+ (defined(__GNUC__) && !defined(__clang__))) && \
+ !(defined(__llvm__) && defined(_WIN32)) && !defined(__MINGW32__)
+#undef ABSL_ATTRIBUTE_WEAK
+#define ABSL_ATTRIBUTE_WEAK __attribute__((weak))
+#define ABSL_HAVE_ATTRIBUTE_WEAK 1
+#else
+#define ABSL_ATTRIBUTE_WEAK
+#define ABSL_HAVE_ATTRIBUTE_WEAK 0
+#endif
+
+// ABSL_ATTRIBUTE_NONNULL
+//
+// Tells the compiler either (a) that a particular function parameter
+// should be a non-null pointer, or (b) that all pointer arguments should
+// be non-null.
+//
+// Note: As the GCC manual states, "[s]ince non-static C++ methods
+// have an implicit 'this' argument, the arguments of such methods
+// should be counted from two, not one."
+//
+// Args are indexed starting at 1.
+//
+// For non-static class member functions, the implicit `this` argument
+// is arg 1, and the first explicit argument is arg 2. For static class member
+// functions, there is no implicit `this`, and the first explicit argument is
+// arg 1.
+//
+// Example:
+//
+// /* arg_a cannot be null, but arg_b can */
+// void Function(void* arg_a, void* arg_b) ABSL_ATTRIBUTE_NONNULL(1);
+//
+// class C {
+// /* arg_a cannot be null, but arg_b can */
+// void Method(void* arg_a, void* arg_b) ABSL_ATTRIBUTE_NONNULL(2);
+//
+// /* arg_a cannot be null, but arg_b can */
+// static void StaticMethod(void* arg_a, void* arg_b)
+// ABSL_ATTRIBUTE_NONNULL(1);
+// };
+//
+// If no arguments are provided, then all pointer arguments should be non-null.
+//
+// /* No pointer arguments may be null. */
+// void Function(void* arg_a, void* arg_b, int arg_c) ABSL_ATTRIBUTE_NONNULL();
+//
+// NOTE: The GCC nonnull attribute actually accepts a list of arguments, but
+// ABSL_ATTRIBUTE_NONNULL does not.
+#if ABSL_HAVE_ATTRIBUTE(nonnull) || (defined(__GNUC__) && !defined(__clang__))
+#define ABSL_ATTRIBUTE_NONNULL(arg_index) __attribute__((nonnull(arg_index)))
+#else
+#define ABSL_ATTRIBUTE_NONNULL(...)
+#endif
+
+// ABSL_ATTRIBUTE_NORETURN
+//
+// Tells the compiler that a given function never returns.
+#if ABSL_HAVE_ATTRIBUTE(noreturn) || (defined(__GNUC__) && !defined(__clang__))
+#define ABSL_ATTRIBUTE_NORETURN __attribute__((noreturn))
+#elif defined(_MSC_VER)
+#define ABSL_ATTRIBUTE_NORETURN __declspec(noreturn)
+#else
+#define ABSL_ATTRIBUTE_NORETURN
+#endif
+
+// ABSL_ATTRIBUTE_NO_SANITIZE_ADDRESS
+//
+// Tells the AddressSanitizer (or other memory testing tools) to ignore a given
+// function. Useful for cases when a function reads random locations on stack,
+// calls _exit from a cloned subprocess, deliberately accesses buffer
+// out of bounds or does other scary things with memory.
+// NOTE: GCC supports AddressSanitizer(asan) since 4.8.
+// https://gcc.gnu.org/gcc-4.8/changes.html
+#if ABSL_HAVE_ATTRIBUTE(no_sanitize_address)
+#define ABSL_ATTRIBUTE_NO_SANITIZE_ADDRESS __attribute__((no_sanitize_address))
+#else
+#define ABSL_ATTRIBUTE_NO_SANITIZE_ADDRESS
+#endif
+
+// ABSL_ATTRIBUTE_NO_SANITIZE_MEMORY
+//
+// Tells the MemorySanitizer to relax the handling of a given function. All "Use
+// of uninitialized value" warnings from such functions will be suppressed, and
+// all values loaded from memory will be considered fully initialized. This
+// attribute is similar to the ABSL_ATTRIBUTE_NO_SANITIZE_ADDRESS attribute
+// above, but deals with initialized-ness rather than addressability issues.
+// NOTE: MemorySanitizer(msan) is supported by Clang but not GCC.
+#if ABSL_HAVE_ATTRIBUTE(no_sanitize_memory)
+#define ABSL_ATTRIBUTE_NO_SANITIZE_MEMORY __attribute__((no_sanitize_memory))
+#else
+#define ABSL_ATTRIBUTE_NO_SANITIZE_MEMORY
+#endif
+
+// ABSL_ATTRIBUTE_NO_SANITIZE_THREAD
+//
+// Tells the ThreadSanitizer to not instrument a given function.
+// NOTE: GCC supports ThreadSanitizer(tsan) since 4.8.
+// https://gcc.gnu.org/gcc-4.8/changes.html
+#if ABSL_HAVE_ATTRIBUTE(no_sanitize_thread)
+#define ABSL_ATTRIBUTE_NO_SANITIZE_THREAD __attribute__((no_sanitize_thread))
+#else
+#define ABSL_ATTRIBUTE_NO_SANITIZE_THREAD
+#endif
+
+// ABSL_ATTRIBUTE_NO_SANITIZE_UNDEFINED
+//
+// Tells the UndefinedSanitizer to ignore a given function. Useful for cases
+// where certain behavior (eg. division by zero) is being used intentionally.
+// NOTE: GCC supports UndefinedBehaviorSanitizer(ubsan) since 4.9.
+// https://gcc.gnu.org/gcc-4.9/changes.html
+#if ABSL_HAVE_ATTRIBUTE(no_sanitize_undefined)
+#define ABSL_ATTRIBUTE_NO_SANITIZE_UNDEFINED \
+ __attribute__((no_sanitize_undefined))
+#elif ABSL_HAVE_ATTRIBUTE(no_sanitize)
+#define ABSL_ATTRIBUTE_NO_SANITIZE_UNDEFINED \
+ __attribute__((no_sanitize("undefined")))
+#else
+#define ABSL_ATTRIBUTE_NO_SANITIZE_UNDEFINED
+#endif
+
+// ABSL_ATTRIBUTE_NO_SANITIZE_CFI
+//
+// Tells the ControlFlowIntegrity sanitizer to not instrument a given function.
+// See https://clang.llvm.org/docs/ControlFlowIntegrity.html for details.
+#if ABSL_HAVE_ATTRIBUTE(no_sanitize)
+#define ABSL_ATTRIBUTE_NO_SANITIZE_CFI __attribute__((no_sanitize("cfi")))
+#else
+#define ABSL_ATTRIBUTE_NO_SANITIZE_CFI
+#endif
+
+// ABSL_ATTRIBUTE_NO_SANITIZE_SAFESTACK
+//
+// Tells the SafeStack to not instrument a given function.
+// See https://clang.llvm.org/docs/SafeStack.html for details.
+#if ABSL_HAVE_ATTRIBUTE(no_sanitize)
+#define ABSL_ATTRIBUTE_NO_SANITIZE_SAFESTACK \
+ __attribute__((no_sanitize("safe-stack")))
+#else
+#define ABSL_ATTRIBUTE_NO_SANITIZE_SAFESTACK
+#endif
+
+// ABSL_ATTRIBUTE_RETURNS_NONNULL
+//
+// Tells the compiler that a particular function never returns a null pointer.
+#if ABSL_HAVE_ATTRIBUTE(returns_nonnull) || \
+ (defined(__GNUC__) && \
+ (__GNUC__ > 5 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 9)) && \
+ !defined(__clang__))
+#define ABSL_ATTRIBUTE_RETURNS_NONNULL __attribute__((returns_nonnull))
+#else
+#define ABSL_ATTRIBUTE_RETURNS_NONNULL
+#endif
+
+// ABSL_HAVE_ATTRIBUTE_SECTION
+//
+// Indicates whether labeled sections are supported. Weak symbol support is
+// a prerequisite. Labeled sections are not supported on Darwin/iOS.
+#ifdef ABSL_HAVE_ATTRIBUTE_SECTION
+#error ABSL_HAVE_ATTRIBUTE_SECTION cannot be directly set
+#elif (ABSL_HAVE_ATTRIBUTE(section) || \
+ (defined(__GNUC__) && !defined(__clang__))) && \
+ !defined(__APPLE__) && ABSL_HAVE_ATTRIBUTE_WEAK
+#define ABSL_HAVE_ATTRIBUTE_SECTION 1
+
+// ABSL_ATTRIBUTE_SECTION
+//
+// Tells the compiler/linker to put a given function into a section and define
+// `__start_ ## name` and `__stop_ ## name` symbols to bracket the section.
+// This functionality is supported by GNU linker. Any function annotated with
+// `ABSL_ATTRIBUTE_SECTION` must not be inlined, or it will be placed into
+// whatever section its caller is placed into.
+//
+#ifndef ABSL_ATTRIBUTE_SECTION
+#define ABSL_ATTRIBUTE_SECTION(name) \
+ __attribute__((section(#name))) __attribute__((noinline))
+#endif
+
+
+// ABSL_ATTRIBUTE_SECTION_VARIABLE
+//
+// Tells the compiler/linker to put a given variable into a section and define
+// `__start_ ## name` and `__stop_ ## name` symbols to bracket the section.
+// This functionality is supported by GNU linker.
+#ifndef ABSL_ATTRIBUTE_SECTION_VARIABLE
+#define ABSL_ATTRIBUTE_SECTION_VARIABLE(name) __attribute__((section(#name)))
+#endif
+
+// ABSL_DECLARE_ATTRIBUTE_SECTION_VARS
+//
+// A weak section declaration to be used as a global declaration
+// for ABSL_ATTRIBUTE_SECTION_START|STOP(name) to compile and link
+// even without functions with ABSL_ATTRIBUTE_SECTION(name).
+// ABSL_DEFINE_ATTRIBUTE_SECTION should be in the exactly one file; it's
+// a no-op on ELF but not on Mach-O.
+//
+#ifndef ABSL_DECLARE_ATTRIBUTE_SECTION_VARS
+#define ABSL_DECLARE_ATTRIBUTE_SECTION_VARS(name) \
+ extern char __start_##name[] ABSL_ATTRIBUTE_WEAK; \
+ extern char __stop_##name[] ABSL_ATTRIBUTE_WEAK
+#endif
+#ifndef ABSL_DEFINE_ATTRIBUTE_SECTION_VARS
+#define ABSL_INIT_ATTRIBUTE_SECTION_VARS(name)
+#define ABSL_DEFINE_ATTRIBUTE_SECTION_VARS(name)
+#endif
+
+// ABSL_ATTRIBUTE_SECTION_START
+//
+// Returns `void*` pointers to start/end of a section of code with
+// functions having ABSL_ATTRIBUTE_SECTION(name).
+// Returns 0 if no such functions exist.
+// One must ABSL_DECLARE_ATTRIBUTE_SECTION_VARS(name) for this to compile and
+// link.
+//
+#define ABSL_ATTRIBUTE_SECTION_START(name) \
+ (reinterpret_cast<void *>(__start_##name))
+#define ABSL_ATTRIBUTE_SECTION_STOP(name) \
+ (reinterpret_cast<void *>(__stop_##name))
+
+#else // !ABSL_HAVE_ATTRIBUTE_SECTION
+
+#define ABSL_HAVE_ATTRIBUTE_SECTION 0
+
+// provide dummy definitions
+#define ABSL_ATTRIBUTE_SECTION(name)
+#define ABSL_ATTRIBUTE_SECTION_VARIABLE(name)
+#define ABSL_INIT_ATTRIBUTE_SECTION_VARS(name)
+#define ABSL_DEFINE_ATTRIBUTE_SECTION_VARS(name)
+#define ABSL_DECLARE_ATTRIBUTE_SECTION_VARS(name)
+#define ABSL_ATTRIBUTE_SECTION_START(name) (reinterpret_cast<void *>(0))
+#define ABSL_ATTRIBUTE_SECTION_STOP(name) (reinterpret_cast<void *>(0))
+
+#endif // ABSL_ATTRIBUTE_SECTION
+
+// ABSL_ATTRIBUTE_STACK_ALIGN_FOR_OLD_LIBC
+//
+// Support for aligning the stack on 32-bit x86.
+#if ABSL_HAVE_ATTRIBUTE(force_align_arg_pointer) || \
+ (defined(__GNUC__) && !defined(__clang__))
+#if defined(__i386__)
+#define ABSL_ATTRIBUTE_STACK_ALIGN_FOR_OLD_LIBC \
+ __attribute__((force_align_arg_pointer))
+#define ABSL_REQUIRE_STACK_ALIGN_TRAMPOLINE (0)
+#elif defined(__x86_64__)
+#define ABSL_REQUIRE_STACK_ALIGN_TRAMPOLINE (1)
+#define ABSL_ATTRIBUTE_STACK_ALIGN_FOR_OLD_LIBC
+#else // !__i386__ && !__x86_64
+#define ABSL_REQUIRE_STACK_ALIGN_TRAMPOLINE (0)
+#define ABSL_ATTRIBUTE_STACK_ALIGN_FOR_OLD_LIBC
+#endif // __i386__
+#else
+#define ABSL_ATTRIBUTE_STACK_ALIGN_FOR_OLD_LIBC
+#define ABSL_REQUIRE_STACK_ALIGN_TRAMPOLINE (0)
+#endif
+
+// ABSL_MUST_USE_RESULT
+//
+// Tells the compiler to warn about unused results.
+//
+// When annotating a function, it must appear as the first part of the
+// declaration or definition. The compiler will warn if the return value from
+// such a function is unused:
+//
+// ABSL_MUST_USE_RESULT Sprocket* AllocateSprocket();
+// AllocateSprocket(); // Triggers a warning.
+//
+// When annotating a class, it is equivalent to annotating every function which
+// returns an instance.
+//
+// class ABSL_MUST_USE_RESULT Sprocket {};
+// Sprocket(); // Triggers a warning.
+//
+// Sprocket MakeSprocket();
+// MakeSprocket(); // Triggers a warning.
+//
+// Note that references and pointers are not instances:
+//
+// Sprocket* SprocketPointer();
+// SprocketPointer(); // Does *not* trigger a warning.
+//
+// ABSL_MUST_USE_RESULT allows using cast-to-void to suppress the unused result
+// warning. For that, warn_unused_result is used only for clang but not for gcc.
+// https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66425
+//
+// Note: past advice was to place the macro after the argument list.
+#if ABSL_HAVE_ATTRIBUTE(nodiscard)
+#define ABSL_MUST_USE_RESULT [[nodiscard]]
+#elif defined(__clang__) && ABSL_HAVE_ATTRIBUTE(warn_unused_result)
+#define ABSL_MUST_USE_RESULT __attribute__((warn_unused_result))
+#else
+#define ABSL_MUST_USE_RESULT
+#endif
+
+// ABSL_ATTRIBUTE_HOT, ABSL_ATTRIBUTE_COLD
+//
+// Tells GCC that a function is hot or cold. GCC can use this information to
+// improve static analysis, i.e. a conditional branch to a cold function
+// is likely to be not-taken.
+// This annotation is used for function declarations.
+//
+// Example:
+//
+// int foo() ABSL_ATTRIBUTE_HOT;
+#if ABSL_HAVE_ATTRIBUTE(hot) || (defined(__GNUC__) && !defined(__clang__))
+#define ABSL_ATTRIBUTE_HOT __attribute__((hot))
+#else
+#define ABSL_ATTRIBUTE_HOT
+#endif
+
+#if ABSL_HAVE_ATTRIBUTE(cold) || (defined(__GNUC__) && !defined(__clang__))
+#define ABSL_ATTRIBUTE_COLD __attribute__((cold))
+#else
+#define ABSL_ATTRIBUTE_COLD
+#endif
+
+// ABSL_XRAY_ALWAYS_INSTRUMENT, ABSL_XRAY_NEVER_INSTRUMENT, ABSL_XRAY_LOG_ARGS
+//
+// We define the ABSL_XRAY_ALWAYS_INSTRUMENT and ABSL_XRAY_NEVER_INSTRUMENT
+// macro used as an attribute to mark functions that must always or never be
+// instrumented by XRay. Currently, this is only supported in Clang/LLVM.
+//
+// For reference on the LLVM XRay instrumentation, see
+// http://llvm.org/docs/XRay.html.
+//
+// A function with the XRAY_ALWAYS_INSTRUMENT macro attribute in its declaration
+// will always get the XRay instrumentation sleds. These sleds may introduce
+// some binary size and runtime overhead and must be used sparingly.
+//
+// These attributes only take effect when the following conditions are met:
+//
+// * The file/target is built in at least C++11 mode, with a Clang compiler
+// that supports XRay attributes.
+// * The file/target is built with the -fxray-instrument flag set for the
+// Clang/LLVM compiler.
+// * The function is defined in the translation unit (the compiler honors the
+// attribute in either the definition or the declaration, and must match).
+//
+// There are cases when, even when building with XRay instrumentation, users
+// might want to control specifically which functions are instrumented for a
+// particular build using special-case lists provided to the compiler. These
+// special case lists are provided to Clang via the
+// -fxray-always-instrument=... and -fxray-never-instrument=... flags. The
+// attributes in source take precedence over these special-case lists.
+//
+// To disable the XRay attributes at build-time, users may define
+// ABSL_NO_XRAY_ATTRIBUTES. Do NOT define ABSL_NO_XRAY_ATTRIBUTES on specific
+// packages/targets, as this may lead to conflicting definitions of functions at
+// link-time.
+//
+// XRay isn't currently supported on Android:
+// https://github.com/android/ndk/issues/368
+#if ABSL_HAVE_CPP_ATTRIBUTE(clang::xray_always_instrument) && \
+ !defined(ABSL_NO_XRAY_ATTRIBUTES) && !defined(__ANDROID__)
+#define ABSL_XRAY_ALWAYS_INSTRUMENT [[clang::xray_always_instrument]]
+#define ABSL_XRAY_NEVER_INSTRUMENT [[clang::xray_never_instrument]]
+#if ABSL_HAVE_CPP_ATTRIBUTE(clang::xray_log_args)
+#define ABSL_XRAY_LOG_ARGS(N) \
+ [[clang::xray_always_instrument, clang::xray_log_args(N)]]
+#else
+#define ABSL_XRAY_LOG_ARGS(N) [[clang::xray_always_instrument]]
+#endif
+#else
+#define ABSL_XRAY_ALWAYS_INSTRUMENT
+#define ABSL_XRAY_NEVER_INSTRUMENT
+#define ABSL_XRAY_LOG_ARGS(N)
+#endif
+
+// ABSL_ATTRIBUTE_REINITIALIZES
+//
+// Indicates that a member function reinitializes the entire object to a known
+// state, independent of the previous state of the object.
+//
+// The clang-tidy check bugprone-use-after-move allows member functions marked
+// with this attribute to be called on objects that have been moved from;
+// without the attribute, this would result in a use-after-move warning.
+#if ABSL_HAVE_CPP_ATTRIBUTE(clang::reinitializes)
+#define ABSL_ATTRIBUTE_REINITIALIZES [[clang::reinitializes]]
+#else
+#define ABSL_ATTRIBUTE_REINITIALIZES
+#endif
+
+// -----------------------------------------------------------------------------
+// Variable Attributes
+// -----------------------------------------------------------------------------
+
+// ABSL_ATTRIBUTE_UNUSED
+//
+// Prevents the compiler from complaining about variables that appear unused.
+#if ABSL_HAVE_ATTRIBUTE(unused) || (defined(__GNUC__) && !defined(__clang__))
+#undef ABSL_ATTRIBUTE_UNUSED
+#define ABSL_ATTRIBUTE_UNUSED __attribute__((__unused__))
+#else
+#define ABSL_ATTRIBUTE_UNUSED
+#endif
+
+// ABSL_ATTRIBUTE_INITIAL_EXEC
+//
+// Tells the compiler to use "initial-exec" mode for a thread-local variable.
+// See http://people.redhat.com/drepper/tls.pdf for the gory details.
+#if ABSL_HAVE_ATTRIBUTE(tls_model) || (defined(__GNUC__) && !defined(__clang__))
+#define ABSL_ATTRIBUTE_INITIAL_EXEC __attribute__((tls_model("initial-exec")))
+#else
+#define ABSL_ATTRIBUTE_INITIAL_EXEC
+#endif
+
+// ABSL_ATTRIBUTE_PACKED
+//
+// Instructs the compiler not to use natural alignment for a tagged data
+// structure, but instead to reduce its alignment to 1. This attribute can
+// either be applied to members of a structure or to a structure in its
+// entirety. Applying this attribute (judiciously) to a structure in its
+// entirety to optimize the memory footprint of very commonly-used structs is
+// fine. Do not apply this attribute to a structure in its entirety if the
+// purpose is to control the offsets of the members in the structure. Instead,
+// apply this attribute only to structure members that need it.
+//
+// When applying ABSL_ATTRIBUTE_PACKED only to specific structure members the
+// natural alignment of structure members not annotated is preserved. Aligned
+// member accesses are faster than non-aligned member accesses even if the
+// targeted microprocessor supports non-aligned accesses.
+#if ABSL_HAVE_ATTRIBUTE(packed) || (defined(__GNUC__) && !defined(__clang__))
+#define ABSL_ATTRIBUTE_PACKED __attribute__((__packed__))
+#else
+#define ABSL_ATTRIBUTE_PACKED
+#endif
+
+// ABSL_ATTRIBUTE_FUNC_ALIGN
+//
+// Tells the compiler to align the function start at least to certain
+// alignment boundary
+#if ABSL_HAVE_ATTRIBUTE(aligned) || (defined(__GNUC__) && !defined(__clang__))
+#define ABSL_ATTRIBUTE_FUNC_ALIGN(bytes) __attribute__((aligned(bytes)))
+#else
+#define ABSL_ATTRIBUTE_FUNC_ALIGN(bytes)
+#endif
+
+// ABSL_FALLTHROUGH_INTENDED
+//
+// Annotates implicit fall-through between switch labels, allowing a case to
+// indicate intentional fallthrough and turn off warnings about any lack of a
+// `break` statement. The ABSL_FALLTHROUGH_INTENDED macro should be followed by
+// a semicolon and can be used in most places where `break` can, provided that
+// no statements exist between it and the next switch label.
+//
+// Example:
+//
+// switch (x) {
+// case 40:
+// case 41:
+// if (truth_is_out_there) {
+// ++x;
+// ABSL_FALLTHROUGH_INTENDED; // Use instead of/along with annotations
+// // in comments
+// } else {
+// return x;
+// }
+// case 42:
+// ...
+//
+// Notes: when compiled with clang in C++11 mode, the ABSL_FALLTHROUGH_INTENDED
+// macro is expanded to the [[clang::fallthrough]] attribute, which is analysed
+// when performing switch labels fall-through diagnostic
+// (`-Wimplicit-fallthrough`). See clang documentation on language extensions
+// for details:
+// https://clang.llvm.org/docs/AttributeReference.html#fallthrough-clang-fallthrough
+//
+// When used with unsupported compilers, the ABSL_FALLTHROUGH_INTENDED macro
+// has no effect on diagnostics. In any case this macro has no effect on runtime
+// behavior and performance of code.
+
+#ifdef ABSL_FALLTHROUGH_INTENDED
+#error "ABSL_FALLTHROUGH_INTENDED should not be defined."
+#endif
+
+// TODO(zhangxy): Use c++17 standard [[fallthrough]] macro, when supported.
+#if defined(__clang__) && defined(__has_warning)
+#if __has_feature(cxx_attributes) && __has_warning("-Wimplicit-fallthrough")
+#define ABSL_FALLTHROUGH_INTENDED [[clang::fallthrough]]
+#endif
+#elif defined(__GNUC__) && __GNUC__ >= 7
+#define ABSL_FALLTHROUGH_INTENDED [[gnu::fallthrough]]
+#endif
+
+#ifndef ABSL_FALLTHROUGH_INTENDED
+#define ABSL_FALLTHROUGH_INTENDED \
+ do { \
+ } while (0)
+#endif
+
+// ABSL_DEPRECATED()
+//
+// Marks a deprecated class, struct, enum, function, method and variable
+// declarations. The macro argument is used as a custom diagnostic message (e.g.
+// suggestion of a better alternative).
+//
+// Examples:
+//
+// class ABSL_DEPRECATED("Use Bar instead") Foo {...};
+//
+// ABSL_DEPRECATED("Use Baz() instead") void Bar() {...}
+//
+// template <typename T>
+// ABSL_DEPRECATED("Use DoThat() instead")
+// void DoThis();
+//
+// Every usage of a deprecated entity will trigger a warning when compiled with
+// clang's `-Wdeprecated-declarations` option. This option is turned off by
+// default, but the warnings will be reported by clang-tidy.
+#if defined(__clang__) && __cplusplus >= 201103L
+#define ABSL_DEPRECATED(message) __attribute__((deprecated(message)))
+#endif
+
+#ifndef ABSL_DEPRECATED
+#define ABSL_DEPRECATED(message)
+#endif
+
+// ABSL_CONST_INIT
+//
+// A variable declaration annotated with the `ABSL_CONST_INIT` attribute will
+// not compile (on supported platforms) unless the variable has a constant
+// initializer. This is useful for variables with static and thread storage
+// duration, because it guarantees that they will not suffer from the so-called
+// "static init order fiasco". Prefer to put this attribute on the most visible
+// declaration of the variable, if there's more than one, because code that
+// accesses the variable can then use the attribute for optimization.
+//
+// Example:
+//
+// class MyClass {
+// public:
+// ABSL_CONST_INIT static MyType my_var;
+// };
+//
+// MyType MyClass::my_var = MakeMyType(...);
+//
+// Note that this attribute is redundant if the variable is declared constexpr.
+#if ABSL_HAVE_CPP_ATTRIBUTE(clang::require_constant_initialization)
+#define ABSL_CONST_INIT [[clang::require_constant_initialization]]
+#else
+#define ABSL_CONST_INIT
+#endif // ABSL_HAVE_CPP_ATTRIBUTE(clang::require_constant_initialization)
+
+#endif // ABSL_BASE_ATTRIBUTES_H_
diff --git a/third_party/abseil/src/absl/base/bit_cast_test.cc b/third_party/abseil/src/absl/base/bit_cast_test.cc
new file mode 100644
index 0000000..8a3a41e
--- /dev/null
+++ b/third_party/abseil/src/absl/base/bit_cast_test.cc
@@ -0,0 +1,109 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Unit test for bit_cast template.
+
+#include <cstdint>
+#include <cstring>
+
+#include "gtest/gtest.h"
+#include "absl/base/casts.h"
+#include "absl/base/macros.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace {
+
+template <int N>
+struct marshall { char buf[N]; };
+
+template <typename T>
+void TestMarshall(const T values[], int num_values) {
+ for (int i = 0; i < num_values; ++i) {
+ T t0 = values[i];
+ marshall<sizeof(T)> m0 = absl::bit_cast<marshall<sizeof(T)> >(t0);
+ T t1 = absl::bit_cast<T>(m0);
+ marshall<sizeof(T)> m1 = absl::bit_cast<marshall<sizeof(T)> >(t1);
+ ASSERT_EQ(0, memcmp(&t0, &t1, sizeof(T)));
+ ASSERT_EQ(0, memcmp(&m0, &m1, sizeof(T)));
+ }
+}
+
+// Convert back and forth to an integral type. The C++ standard does
+// not guarantee this will work, but we test that this works on all the
+// platforms we support.
+//
+// Likewise, we below make assumptions about sizeof(float) and
+// sizeof(double) which the standard does not guarantee, but which hold on the
+// platforms we support.
+
+template <typename T, typename I>
+void TestIntegral(const T values[], int num_values) {
+ for (int i = 0; i < num_values; ++i) {
+ T t0 = values[i];
+ I i0 = absl::bit_cast<I>(t0);
+ T t1 = absl::bit_cast<T>(i0);
+ I i1 = absl::bit_cast<I>(t1);
+ ASSERT_EQ(0, memcmp(&t0, &t1, sizeof(T)));
+ ASSERT_EQ(i0, i1);
+ }
+}
+
+TEST(BitCast, Bool) {
+ static const bool bool_list[] = { false, true };
+ TestMarshall<bool>(bool_list, ABSL_ARRAYSIZE(bool_list));
+}
+
+TEST(BitCast, Int32) {
+ static const int32_t int_list[] =
+ { 0, 1, 100, 2147483647, -1, -100, -2147483647, -2147483647-1 };
+ TestMarshall<int32_t>(int_list, ABSL_ARRAYSIZE(int_list));
+}
+
+TEST(BitCast, Int64) {
+ static const int64_t int64_list[] =
+ { 0, 1, 1LL << 40, -1, -(1LL<<40) };
+ TestMarshall<int64_t>(int64_list, ABSL_ARRAYSIZE(int64_list));
+}
+
+TEST(BitCast, Uint64) {
+ static const uint64_t uint64_list[] =
+ { 0, 1, 1LLU << 40, 1LLU << 63 };
+ TestMarshall<uint64_t>(uint64_list, ABSL_ARRAYSIZE(uint64_list));
+}
+
+TEST(BitCast, Float) {
+ static const float float_list[] =
+ { 0.0f, 1.0f, -1.0f, 10.0f, -10.0f,
+ 1e10f, 1e20f, 1e-10f, 1e-20f,
+ 2.71828f, 3.14159f };
+ TestMarshall<float>(float_list, ABSL_ARRAYSIZE(float_list));
+ TestIntegral<float, int>(float_list, ABSL_ARRAYSIZE(float_list));
+ TestIntegral<float, unsigned>(float_list, ABSL_ARRAYSIZE(float_list));
+}
+
+TEST(BitCast, Double) {
+ static const double double_list[] =
+ { 0.0, 1.0, -1.0, 10.0, -10.0,
+ 1e10, 1e100, 1e-10, 1e-100,
+ 2.718281828459045,
+ 3.141592653589793238462643383279502884197169399375105820974944 };
+ TestMarshall<double>(double_list, ABSL_ARRAYSIZE(double_list));
+ TestIntegral<double, int64_t>(double_list, ABSL_ARRAYSIZE(double_list));
+ TestIntegral<double, uint64_t>(double_list, ABSL_ARRAYSIZE(double_list));
+}
+
+} // namespace
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/base/call_once.h b/third_party/abseil/src/absl/base/call_once.h
new file mode 100644
index 0000000..5b468af
--- /dev/null
+++ b/third_party/abseil/src/absl/base/call_once.h
@@ -0,0 +1,226 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: call_once.h
+// -----------------------------------------------------------------------------
+//
+// This header file provides an Abseil version of `std::call_once` for invoking
+// a given function at most once, across all threads. This Abseil version is
+// faster than the C++11 version and incorporates the C++17 argument-passing
+// fix, so that (for example) non-const references may be passed to the invoked
+// function.
+
+#ifndef ABSL_BASE_CALL_ONCE_H_
+#define ABSL_BASE_CALL_ONCE_H_
+
+#include <algorithm>
+#include <atomic>
+#include <cstdint>
+#include <type_traits>
+#include <utility>
+
+#include "absl/base/internal/invoke.h"
+#include "absl/base/internal/low_level_scheduling.h"
+#include "absl/base/internal/raw_logging.h"
+#include "absl/base/internal/scheduling_mode.h"
+#include "absl/base/internal/spinlock_wait.h"
+#include "absl/base/macros.h"
+#include "absl/base/optimization.h"
+#include "absl/base/port.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+class once_flag;
+
+namespace base_internal {
+std::atomic<uint32_t>* ControlWord(absl::once_flag* flag);
+} // namespace base_internal
+
+// call_once()
+//
+// For all invocations using a given `once_flag`, invokes a given `fn` exactly
+// once across all threads. The first call to `call_once()` with a particular
+// `once_flag` argument (that does not throw an exception) will run the
+// specified function with the provided `args`; other calls with the same
+// `once_flag` argument will not run the function, but will wait
+// for the provided function to finish running (if it is still running).
+//
+// This mechanism provides a safe, simple, and fast mechanism for one-time
+// initialization in a multi-threaded process.
+//
+// Example:
+//
+// class MyInitClass {
+// public:
+// ...
+// mutable absl::once_flag once_;
+//
+// MyInitClass* init() const {
+// absl::call_once(once_, &MyInitClass::Init, this);
+// return ptr_;
+// }
+//
+template <typename Callable, typename... Args>
+void call_once(absl::once_flag& flag, Callable&& fn, Args&&... args);
+
+// once_flag
+//
+// Objects of this type are used to distinguish calls to `call_once()` and
+// ensure the provided function is only invoked once across all threads. This
+// type is not copyable or movable. However, it has a `constexpr`
+// constructor, and is safe to use as a namespace-scoped global variable.
+class once_flag {
+ public:
+ constexpr once_flag() : control_(0) {}
+ once_flag(const once_flag&) = delete;
+ once_flag& operator=(const once_flag&) = delete;
+
+ private:
+ friend std::atomic<uint32_t>* base_internal::ControlWord(once_flag* flag);
+ std::atomic<uint32_t> control_;
+};
+
+//------------------------------------------------------------------------------
+// End of public interfaces.
+// Implementation details follow.
+//------------------------------------------------------------------------------
+
+namespace base_internal {
+
+// Like call_once, but uses KERNEL_ONLY scheduling. Intended to be used to
+// initialize entities used by the scheduler implementation.
+template <typename Callable, typename... Args>
+void LowLevelCallOnce(absl::once_flag* flag, Callable&& fn, Args&&... args);
+
+// Disables scheduling while on stack when scheduling mode is non-cooperative.
+// No effect for cooperative scheduling modes.
+class SchedulingHelper {
+ public:
+ explicit SchedulingHelper(base_internal::SchedulingMode mode) : mode_(mode) {
+ if (mode_ == base_internal::SCHEDULE_KERNEL_ONLY) {
+ guard_result_ = base_internal::SchedulingGuard::DisableRescheduling();
+ }
+ }
+
+ ~SchedulingHelper() {
+ if (mode_ == base_internal::SCHEDULE_KERNEL_ONLY) {
+ base_internal::SchedulingGuard::EnableRescheduling(guard_result_);
+ }
+ }
+
+ private:
+ base_internal::SchedulingMode mode_;
+ bool guard_result_;
+};
+
+// Bit patterns for call_once state machine values. Internal implementation
+// detail, not for use by clients.
+//
+// The bit patterns are arbitrarily chosen from unlikely values, to aid in
+// debugging. However, kOnceInit must be 0, so that a zero-initialized
+// once_flag will be valid for immediate use.
+enum {
+ kOnceInit = 0,
+ kOnceRunning = 0x65C2937B,
+ kOnceWaiter = 0x05A308D2,
+ // A very small constant is chosen for kOnceDone so that it fit in a single
+ // compare with immediate instruction for most common ISAs. This is verified
+ // for x86, POWER and ARM.
+ kOnceDone = 221, // Random Number
+};
+
+template <typename Callable, typename... Args>
+ABSL_ATTRIBUTE_NOINLINE
+void CallOnceImpl(std::atomic<uint32_t>* control,
+ base_internal::SchedulingMode scheduling_mode, Callable&& fn,
+ Args&&... args) {
+#ifndef NDEBUG
+ {
+ uint32_t old_control = control->load(std::memory_order_relaxed);
+ if (old_control != kOnceInit &&
+ old_control != kOnceRunning &&
+ old_control != kOnceWaiter &&
+ old_control != kOnceDone) {
+ ABSL_RAW_LOG(FATAL, "Unexpected value for control word: 0x%lx",
+ static_cast<unsigned long>(old_control)); // NOLINT
+ }
+ }
+#endif // NDEBUG
+ static const base_internal::SpinLockWaitTransition trans[] = {
+ {kOnceInit, kOnceRunning, true},
+ {kOnceRunning, kOnceWaiter, false},
+ {kOnceDone, kOnceDone, true}};
+
+ // Must do this before potentially modifying control word's state.
+ base_internal::SchedulingHelper maybe_disable_scheduling(scheduling_mode);
+ // Short circuit the simplest case to avoid procedure call overhead.
+ // The base_internal::SpinLockWait() call returns either kOnceInit or
+ // kOnceDone. If it returns kOnceDone, it must have loaded the control word
+ // with std::memory_order_acquire and seen a value of kOnceDone.
+ uint32_t old_control = kOnceInit;
+ if (control->compare_exchange_strong(old_control, kOnceRunning,
+ std::memory_order_relaxed) ||
+ base_internal::SpinLockWait(control, ABSL_ARRAYSIZE(trans), trans,
+ scheduling_mode) == kOnceInit) {
+ base_internal::invoke(std::forward<Callable>(fn),
+ std::forward<Args>(args)...);
+ // The call to SpinLockWake below is an optimization, because the waiter
+ // in SpinLockWait is waiting with a short timeout. The atomic load/store
+ // sequence is slightly faster than an atomic exchange:
+ // old_control = control->exchange(base_internal::kOnceDone,
+ // std::memory_order_release);
+ // We opt for a slightly faster case when there are no waiters, in spite
+ // of longer tail latency when there are waiters.
+ old_control = control->load(std::memory_order_relaxed);
+ control->store(base_internal::kOnceDone, std::memory_order_release);
+ if (old_control == base_internal::kOnceWaiter) {
+ base_internal::SpinLockWake(control, true);
+ }
+ } // else *control is already kOnceDone
+}
+
+inline std::atomic<uint32_t>* ControlWord(once_flag* flag) {
+ return &flag->control_;
+}
+
+template <typename Callable, typename... Args>
+void LowLevelCallOnce(absl::once_flag* flag, Callable&& fn, Args&&... args) {
+ std::atomic<uint32_t>* once = base_internal::ControlWord(flag);
+ uint32_t s = once->load(std::memory_order_acquire);
+ if (ABSL_PREDICT_FALSE(s != base_internal::kOnceDone)) {
+ base_internal::CallOnceImpl(once, base_internal::SCHEDULE_KERNEL_ONLY,
+ std::forward<Callable>(fn),
+ std::forward<Args>(args)...);
+ }
+}
+
+} // namespace base_internal
+
+template <typename Callable, typename... Args>
+void call_once(absl::once_flag& flag, Callable&& fn, Args&&... args) {
+ std::atomic<uint32_t>* once = base_internal::ControlWord(&flag);
+ uint32_t s = once->load(std::memory_order_acquire);
+ if (ABSL_PREDICT_FALSE(s != base_internal::kOnceDone)) {
+ base_internal::CallOnceImpl(
+ once, base_internal::SCHEDULE_COOPERATIVE_AND_KERNEL,
+ std::forward<Callable>(fn), std::forward<Args>(args)...);
+ }
+}
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_BASE_CALL_ONCE_H_
diff --git a/third_party/abseil/src/absl/base/call_once_test.cc b/third_party/abseil/src/absl/base/call_once_test.cc
new file mode 100644
index 0000000..11d26c4
--- /dev/null
+++ b/third_party/abseil/src/absl/base/call_once_test.cc
@@ -0,0 +1,107 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/base/call_once.h"
+
+#include <thread>
+#include <vector>
+
+#include "gtest/gtest.h"
+#include "absl/base/attributes.h"
+#include "absl/base/const_init.h"
+#include "absl/base/thread_annotations.h"
+#include "absl/synchronization/mutex.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace {
+
+absl::once_flag once;
+
+ABSL_CONST_INIT Mutex counters_mu(absl::kConstInit);
+
+int running_thread_count ABSL_GUARDED_BY(counters_mu) = 0;
+int call_once_invoke_count ABSL_GUARDED_BY(counters_mu) = 0;
+int call_once_finished_count ABSL_GUARDED_BY(counters_mu) = 0;
+int call_once_return_count ABSL_GUARDED_BY(counters_mu) = 0;
+bool done_blocking ABSL_GUARDED_BY(counters_mu) = false;
+
+// Function to be called from absl::call_once. Waits for a notification.
+void WaitAndIncrement() {
+ counters_mu.Lock();
+ ++call_once_invoke_count;
+ counters_mu.Unlock();
+
+ counters_mu.LockWhen(Condition(&done_blocking));
+ ++call_once_finished_count;
+ counters_mu.Unlock();
+}
+
+void ThreadBody() {
+ counters_mu.Lock();
+ ++running_thread_count;
+ counters_mu.Unlock();
+
+ absl::call_once(once, WaitAndIncrement);
+
+ counters_mu.Lock();
+ ++call_once_return_count;
+ counters_mu.Unlock();
+}
+
+// Returns true if all threads are set up for the test.
+bool ThreadsAreSetup(void*) ABSL_EXCLUSIVE_LOCKS_REQUIRED(counters_mu) {
+ // All ten threads must be running, and WaitAndIncrement should be blocked.
+ return running_thread_count == 10 && call_once_invoke_count == 1;
+}
+
+TEST(CallOnceTest, ExecutionCount) {
+ std::vector<std::thread> threads;
+
+ // Start 10 threads all calling call_once on the same once_flag.
+ for (int i = 0; i < 10; ++i) {
+ threads.emplace_back(ThreadBody);
+ }
+
+
+ // Wait until all ten threads have started, and WaitAndIncrement has been
+ // invoked.
+ counters_mu.LockWhen(Condition(ThreadsAreSetup, nullptr));
+
+ // WaitAndIncrement should have been invoked by exactly one call_once()
+ // instance. That thread should be blocking on a notification, and all other
+ // call_once instances should be blocking as well.
+ EXPECT_EQ(call_once_invoke_count, 1);
+ EXPECT_EQ(call_once_finished_count, 0);
+ EXPECT_EQ(call_once_return_count, 0);
+
+ // Allow WaitAndIncrement to finish executing. Once it does, the other
+ // call_once waiters will be unblocked.
+ done_blocking = true;
+ counters_mu.Unlock();
+
+ for (std::thread& thread : threads) {
+ thread.join();
+ }
+
+ counters_mu.Lock();
+ EXPECT_EQ(call_once_invoke_count, 1);
+ EXPECT_EQ(call_once_finished_count, 1);
+ EXPECT_EQ(call_once_return_count, 10);
+ counters_mu.Unlock();
+}
+
+} // namespace
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/base/casts.h b/third_party/abseil/src/absl/base/casts.h
new file mode 100644
index 0000000..83c6912
--- /dev/null
+++ b/third_party/abseil/src/absl/base/casts.h
@@ -0,0 +1,187 @@
+//
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: casts.h
+// -----------------------------------------------------------------------------
+//
+// This header file defines casting templates to fit use cases not covered by
+// the standard casts provided in the C++ standard. As with all cast operations,
+// use these with caution and only if alternatives do not exist.
+
+#ifndef ABSL_BASE_CASTS_H_
+#define ABSL_BASE_CASTS_H_
+
+#include <cstring>
+#include <memory>
+#include <type_traits>
+#include <utility>
+
+#include "absl/base/internal/identity.h"
+#include "absl/base/macros.h"
+#include "absl/meta/type_traits.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+namespace internal_casts {
+
+template <class Dest, class Source>
+struct is_bitcastable
+ : std::integral_constant<
+ bool,
+ sizeof(Dest) == sizeof(Source) &&
+ type_traits_internal::is_trivially_copyable<Source>::value &&
+ type_traits_internal::is_trivially_copyable<Dest>::value &&
+ std::is_default_constructible<Dest>::value> {};
+
+} // namespace internal_casts
+
+// implicit_cast()
+//
+// Performs an implicit conversion between types following the language
+// rules for implicit conversion; if an implicit conversion is otherwise
+// allowed by the language in the given context, this function performs such an
+// implicit conversion.
+//
+// Example:
+//
+// // If the context allows implicit conversion:
+// From from;
+// To to = from;
+//
+// // Such code can be replaced by:
+// implicit_cast<To>(from);
+//
+// An `implicit_cast()` may also be used to annotate numeric type conversions
+// that, although safe, may produce compiler warnings (such as `long` to `int`).
+// Additionally, an `implicit_cast()` is also useful within return statements to
+// indicate a specific implicit conversion is being undertaken.
+//
+// Example:
+//
+// return implicit_cast<double>(size_in_bytes) / capacity_;
+//
+// Annotating code with `implicit_cast()` allows you to explicitly select
+// particular overloads and template instantiations, while providing a safer
+// cast than `reinterpret_cast()` or `static_cast()`.
+//
+// Additionally, an `implicit_cast()` can be used to allow upcasting within a
+// type hierarchy where incorrect use of `static_cast()` could accidentally
+// allow downcasting.
+//
+// Finally, an `implicit_cast()` can be used to perform implicit conversions
+// from unrelated types that otherwise couldn't be implicitly cast directly;
+// C++ will normally only implicitly cast "one step" in such conversions.
+//
+// That is, if C is a type which can be implicitly converted to B, with B being
+// a type that can be implicitly converted to A, an `implicit_cast()` can be
+// used to convert C to B (which the compiler can then implicitly convert to A
+// using language rules).
+//
+// Example:
+//
+// // Assume an object C is convertible to B, which is implicitly convertible
+// // to A
+// A a = implicit_cast<B>(C);
+//
+// Such implicit cast chaining may be useful within template logic.
+template <typename To>
+constexpr To implicit_cast(typename absl::internal::identity_t<To> to) {
+ return to;
+}
+
+// bit_cast()
+//
+// Performs a bitwise cast on a type without changing the underlying bit
+// representation of that type's value. The two types must be of the same size
+// and both types must be trivially copyable. As with most casts, use with
+// caution. A `bit_cast()` might be needed when you need to temporarily treat a
+// type as some other type, such as in the following cases:
+//
+// * Serialization (casting temporarily to `char *` for those purposes is
+// always allowed by the C++ standard)
+// * Managing the individual bits of a type within mathematical operations
+// that are not normally accessible through that type
+// * Casting non-pointer types to pointer types (casting the other way is
+// allowed by `reinterpret_cast()` but round-trips cannot occur the other
+// way).
+//
+// Example:
+//
+// float f = 3.14159265358979;
+// int i = bit_cast<int32_t>(f);
+// // i = 0x40490fdb
+//
+// Casting non-pointer types to pointer types and then dereferencing them
+// traditionally produces undefined behavior.
+//
+// Example:
+//
+// // WRONG
+// float f = 3.14159265358979; // WRONG
+// int i = * reinterpret_cast<int*>(&f); // WRONG
+//
+// The address-casting method produces undefined behavior according to the ISO
+// C++ specification section [basic.lval]. Roughly, this section says: if an
+// object in memory has one type, and a program accesses it with a different
+// type, the result is undefined behavior for most values of "different type".
+//
+// Such casting results in type punning: holding an object in memory of one type
+// and reading its bits back using a different type. A `bit_cast()` avoids this
+// issue by implementing its casts using `memcpy()`, which avoids introducing
+// this undefined behavior.
+//
+// NOTE: The requirements here are more strict than the bit_cast of standard
+// proposal p0476 due to the need for workarounds and lack of intrinsics.
+// Specifically, this implementation also requires `Dest` to be
+// default-constructible.
+template <
+ typename Dest, typename Source,
+ typename std::enable_if<internal_casts::is_bitcastable<Dest, Source>::value,
+ int>::type = 0>
+inline Dest bit_cast(const Source& source) {
+ Dest dest;
+ memcpy(static_cast<void*>(std::addressof(dest)),
+ static_cast<const void*>(std::addressof(source)), sizeof(dest));
+ return dest;
+}
+
+// NOTE: This overload is only picked if the requirements of bit_cast are
+// not met. It is therefore UB, but is provided temporarily as previous
+// versions of this function template were unchecked. Do not use this in
+// new code.
+template <
+ typename Dest, typename Source,
+ typename std::enable_if<
+ !internal_casts::is_bitcastable<Dest, Source>::value,
+ int>::type = 0>
+ABSL_DEPRECATED(
+ "absl::bit_cast type requirements were violated. Update the types "
+ "being used such that they are the same size and are both "
+ "TriviallyCopyable.")
+inline Dest bit_cast(const Source& source) {
+ static_assert(sizeof(Dest) == sizeof(Source),
+ "Source and destination types should have equal sizes.");
+
+ Dest dest;
+ memcpy(&dest, &source, sizeof(dest));
+ return dest;
+}
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_BASE_CASTS_H_
diff --git a/third_party/abseil/src/absl/base/config.h b/third_party/abseil/src/absl/base/config.h
new file mode 100644
index 0000000..3f7f32b
--- /dev/null
+++ b/third_party/abseil/src/absl/base/config.h
@@ -0,0 +1,714 @@
+//
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: config.h
+// -----------------------------------------------------------------------------
+//
+// This header file defines a set of macros for checking the presence of
+// important compiler and platform features. Such macros can be used to
+// produce portable code by parameterizing compilation based on the presence or
+// lack of a given feature.
+//
+// We define a "feature" as some interface we wish to program to: for example,
+// a library function or system call. A value of `1` indicates support for
+// that feature; any other value indicates the feature support is undefined.
+//
+// Example:
+//
+// Suppose a programmer wants to write a program that uses the 'mmap()' system
+// call. The Abseil macro for that feature (`ABSL_HAVE_MMAP`) allows you to
+// selectively include the `mmap.h` header and bracket code using that feature
+// in the macro:
+//
+// #include "absl/base/config.h"
+//
+// #ifdef ABSL_HAVE_MMAP
+// #include "sys/mman.h"
+// #endif //ABSL_HAVE_MMAP
+//
+// ...
+// #ifdef ABSL_HAVE_MMAP
+// void *ptr = mmap(...);
+// ...
+// #endif // ABSL_HAVE_MMAP
+
+#ifndef ABSL_BASE_CONFIG_H_
+#define ABSL_BASE_CONFIG_H_
+
+// Included for the __GLIBC__ macro (or similar macros on other systems).
+#include <limits.h>
+
+#ifdef __cplusplus
+// Included for __GLIBCXX__, _LIBCPP_VERSION
+#include <cstddef>
+#endif // __cplusplus
+
+#if defined(__APPLE__)
+// Included for TARGET_OS_IPHONE, __IPHONE_OS_VERSION_MIN_REQUIRED,
+// __IPHONE_8_0.
+#include <Availability.h>
+#include <TargetConditionals.h>
+#endif
+
+#include "absl/base/options.h"
+#include "absl/base/policy_checks.h"
+
+// Helper macro to convert a CPP variable to a string literal.
+#define ABSL_INTERNAL_DO_TOKEN_STR(x) #x
+#define ABSL_INTERNAL_TOKEN_STR(x) ABSL_INTERNAL_DO_TOKEN_STR(x)
+
+// -----------------------------------------------------------------------------
+// Abseil namespace annotations
+// -----------------------------------------------------------------------------
+
+// ABSL_NAMESPACE_BEGIN/ABSL_NAMESPACE_END
+//
+// An annotation placed at the beginning/end of each `namespace absl` scope.
+// This is used to inject an inline namespace.
+//
+// The proper way to write Abseil code in the `absl` namespace is:
+//
+// namespace absl {
+// ABSL_NAMESPACE_BEGIN
+//
+// void Foo(); // absl::Foo().
+//
+// ABSL_NAMESPACE_END
+// } // namespace absl
+//
+// Users of Abseil should not use these macros, because users of Abseil should
+// not write `namespace absl {` in their own code for any reason. (Abseil does
+// not support forward declarations of its own types, nor does it support
+// user-provided specialization of Abseil templates. Code that violates these
+// rules may be broken without warning.)
+#if !defined(ABSL_OPTION_USE_INLINE_NAMESPACE) || \
+ !defined(ABSL_OPTION_INLINE_NAMESPACE_NAME)
+#error options.h is misconfigured.
+#endif
+
+// Check that ABSL_OPTION_INLINE_NAMESPACE_NAME is neither "head" nor ""
+#if defined(__cplusplus) && ABSL_OPTION_USE_INLINE_NAMESPACE == 1
+
+#define ABSL_INTERNAL_INLINE_NAMESPACE_STR \
+ ABSL_INTERNAL_TOKEN_STR(ABSL_OPTION_INLINE_NAMESPACE_NAME)
+
+static_assert(ABSL_INTERNAL_INLINE_NAMESPACE_STR[0] != '\0',
+ "options.h misconfigured: ABSL_OPTION_INLINE_NAMESPACE_NAME must "
+ "not be empty.");
+static_assert(ABSL_INTERNAL_INLINE_NAMESPACE_STR[0] != 'h' ||
+ ABSL_INTERNAL_INLINE_NAMESPACE_STR[1] != 'e' ||
+ ABSL_INTERNAL_INLINE_NAMESPACE_STR[2] != 'a' ||
+ ABSL_INTERNAL_INLINE_NAMESPACE_STR[3] != 'd' ||
+ ABSL_INTERNAL_INLINE_NAMESPACE_STR[4] != '\0',
+ "options.h misconfigured: ABSL_OPTION_INLINE_NAMESPACE_NAME must "
+ "be changed to a new, unique identifier name.");
+
+#endif
+
+#if ABSL_OPTION_USE_INLINE_NAMESPACE == 0
+#define ABSL_NAMESPACE_BEGIN
+#define ABSL_NAMESPACE_END
+#elif ABSL_OPTION_USE_INLINE_NAMESPACE == 1
+#define ABSL_NAMESPACE_BEGIN \
+ inline namespace ABSL_OPTION_INLINE_NAMESPACE_NAME {
+#define ABSL_NAMESPACE_END }
+#else
+#error options.h is misconfigured.
+#endif
+
+// -----------------------------------------------------------------------------
+// Compiler Feature Checks
+// -----------------------------------------------------------------------------
+
+// ABSL_HAVE_BUILTIN()
+//
+// Checks whether the compiler supports a Clang Feature Checking Macro, and if
+// so, checks whether it supports the provided builtin function "x" where x
+// is one of the functions noted in
+// https://clang.llvm.org/docs/LanguageExtensions.html
+//
+// Note: Use this macro to avoid an extra level of #ifdef __has_builtin check.
+// http://releases.llvm.org/3.3/tools/clang/docs/LanguageExtensions.html
+#ifdef __has_builtin
+#define ABSL_HAVE_BUILTIN(x) __has_builtin(x)
+#else
+#define ABSL_HAVE_BUILTIN(x) 0
+#endif
+
+#if defined(__is_identifier)
+#define ABSL_INTERNAL_HAS_KEYWORD(x) !(__is_identifier(x))
+#else
+#define ABSL_INTERNAL_HAS_KEYWORD(x) 0
+#endif
+
+#ifdef __has_feature
+#define ABSL_HAVE_FEATURE(f) __has_feature(f)
+#else
+#define ABSL_HAVE_FEATURE(f) 0
+#endif
+
+// ABSL_HAVE_TLS is defined to 1 when __thread should be supported.
+// We assume __thread is supported on Linux when compiled with Clang or compiled
+// against libstdc++ with _GLIBCXX_HAVE_TLS defined.
+#ifdef ABSL_HAVE_TLS
+#error ABSL_HAVE_TLS cannot be directly set
+#elif defined(__linux__) && (defined(__clang__) || defined(_GLIBCXX_HAVE_TLS))
+#define ABSL_HAVE_TLS 1
+#endif
+
+// ABSL_HAVE_STD_IS_TRIVIALLY_DESTRUCTIBLE
+//
+// Checks whether `std::is_trivially_destructible<T>` is supported.
+//
+// Notes: All supported compilers using libc++ support this feature, as does
+// gcc >= 4.8.1 using libstdc++, and Visual Studio.
+#ifdef ABSL_HAVE_STD_IS_TRIVIALLY_DESTRUCTIBLE
+#error ABSL_HAVE_STD_IS_TRIVIALLY_DESTRUCTIBLE cannot be directly set
+#elif defined(_LIBCPP_VERSION) || \
+ (!defined(__clang__) && defined(__GNUC__) && defined(__GLIBCXX__) && \
+ (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8))) || \
+ defined(_MSC_VER)
+#define ABSL_HAVE_STD_IS_TRIVIALLY_DESTRUCTIBLE 1
+#endif
+
+// ABSL_HAVE_STD_IS_TRIVIALLY_CONSTRUCTIBLE
+//
+// Checks whether `std::is_trivially_default_constructible<T>` and
+// `std::is_trivially_copy_constructible<T>` are supported.
+
+// ABSL_HAVE_STD_IS_TRIVIALLY_ASSIGNABLE
+//
+// Checks whether `std::is_trivially_copy_assignable<T>` is supported.
+
+// Notes: Clang with libc++ supports these features, as does gcc >= 5.1 with
+// either libc++ or libstdc++, and Visual Studio (but not NVCC).
+#if defined(ABSL_HAVE_STD_IS_TRIVIALLY_CONSTRUCTIBLE)
+#error ABSL_HAVE_STD_IS_TRIVIALLY_CONSTRUCTIBLE cannot be directly set
+#elif defined(ABSL_HAVE_STD_IS_TRIVIALLY_ASSIGNABLE)
+#error ABSL_HAVE_STD_IS_TRIVIALLY_ASSIGNABLE cannot directly set
+#elif (defined(__clang__) && defined(_LIBCPP_VERSION)) || \
+ (!defined(__clang__) && defined(__GNUC__) && \
+ (__GNUC__ > 7 || (__GNUC__ == 7 && __GNUC_MINOR__ >= 4)) && \
+ (defined(_LIBCPP_VERSION) || defined(__GLIBCXX__))) || \
+ (defined(_MSC_VER) && !defined(__NVCC__))
+#define ABSL_HAVE_STD_IS_TRIVIALLY_CONSTRUCTIBLE 1
+#define ABSL_HAVE_STD_IS_TRIVIALLY_ASSIGNABLE 1
+#endif
+
+// ABSL_HAVE_SOURCE_LOCATION_CURRENT
+//
+// Indicates whether `absl::SourceLocation::current()` will return useful
+// information in some contexts.
+#ifndef ABSL_HAVE_SOURCE_LOCATION_CURRENT
+#if ABSL_INTERNAL_HAS_KEYWORD(__builtin_LINE) && \
+ ABSL_INTERNAL_HAS_KEYWORD(__builtin_FILE)
+#define ABSL_HAVE_SOURCE_LOCATION_CURRENT 1
+#endif
+#endif
+
+// ABSL_HAVE_THREAD_LOCAL
+//
+// Checks whether C++11's `thread_local` storage duration specifier is
+// supported.
+#ifdef ABSL_HAVE_THREAD_LOCAL
+#error ABSL_HAVE_THREAD_LOCAL cannot be directly set
+#elif defined(__APPLE__)
+// Notes:
+// * Xcode's clang did not support `thread_local` until version 8, and
+// even then not for all iOS < 9.0.
+// * Xcode 9.3 started disallowing `thread_local` for 32-bit iOS simulator
+// targeting iOS 9.x.
+// * Xcode 10 moves the deployment target check for iOS < 9.0 to link time
+// making ABSL_HAVE_FEATURE unreliable there.
+//
+#if ABSL_HAVE_FEATURE(cxx_thread_local) && \
+ !(TARGET_OS_IPHONE && __IPHONE_OS_VERSION_MIN_REQUIRED < __IPHONE_9_0)
+#define ABSL_HAVE_THREAD_LOCAL 1
+#endif
+#else // !defined(__APPLE__)
+#define ABSL_HAVE_THREAD_LOCAL 1
+#endif
+
+// There are platforms for which TLS should not be used even though the compiler
+// makes it seem like it's supported (Android NDK < r12b for example).
+// This is primarily because of linker problems and toolchain misconfiguration:
+// Abseil does not intend to support this indefinitely. Currently, the newest
+// toolchain that we intend to support that requires this behavior is the
+// r11 NDK - allowing for a 5 year support window on that means this option
+// is likely to be removed around June of 2021.
+// TLS isn't supported until NDK r12b per
+// https://developer.android.com/ndk/downloads/revision_history.html
+// Since NDK r16, `__NDK_MAJOR__` and `__NDK_MINOR__` are defined in
+// <android/ndk-version.h>. For NDK < r16, users should define these macros,
+// e.g. `-D__NDK_MAJOR__=11 -D__NKD_MINOR__=0` for NDK r11.
+#if defined(__ANDROID__) && defined(__clang__)
+#if __has_include(<android/ndk-version.h>)
+#include <android/ndk-version.h>
+#endif // __has_include(<android/ndk-version.h>)
+#if defined(__ANDROID__) && defined(__clang__) && defined(__NDK_MAJOR__) && \
+ defined(__NDK_MINOR__) && \
+ ((__NDK_MAJOR__ < 12) || ((__NDK_MAJOR__ == 12) && (__NDK_MINOR__ < 1)))
+#undef ABSL_HAVE_TLS
+#undef ABSL_HAVE_THREAD_LOCAL
+#endif
+#endif // defined(__ANDROID__) && defined(__clang__)
+
+// ABSL_HAVE_INTRINSIC_INT128
+//
+// Checks whether the __int128 compiler extension for a 128-bit integral type is
+// supported.
+//
+// Note: __SIZEOF_INT128__ is defined by Clang and GCC when __int128 is
+// supported, but we avoid using it in certain cases:
+// * On Clang:
+// * Building using Clang for Windows, where the Clang runtime library has
+// 128-bit support only on LP64 architectures, but Windows is LLP64.
+// * On Nvidia's nvcc:
+// * nvcc also defines __GNUC__ and __SIZEOF_INT128__, but not all versions
+// actually support __int128.
+#ifdef ABSL_HAVE_INTRINSIC_INT128
+#error ABSL_HAVE_INTRINSIC_INT128 cannot be directly set
+#elif defined(__SIZEOF_INT128__)
+#if (defined(__clang__) && !defined(_WIN32)) || \
+ (defined(__CUDACC__) && __CUDACC_VER_MAJOR__ >= 9) || \
+ (defined(__GNUC__) && !defined(__clang__) && !defined(__CUDACC__))
+#define ABSL_HAVE_INTRINSIC_INT128 1
+#elif defined(__CUDACC__)
+// __CUDACC_VER__ is a full version number before CUDA 9, and is defined to a
+// string explaining that it has been removed starting with CUDA 9. We use
+// nested #ifs because there is no short-circuiting in the preprocessor.
+// NOTE: `__CUDACC__` could be undefined while `__CUDACC_VER__` is defined.
+#if __CUDACC_VER__ >= 70000
+#define ABSL_HAVE_INTRINSIC_INT128 1
+#endif // __CUDACC_VER__ >= 70000
+#endif // defined(__CUDACC__)
+#endif // ABSL_HAVE_INTRINSIC_INT128
+
+// ABSL_HAVE_EXCEPTIONS
+//
+// Checks whether the compiler both supports and enables exceptions. Many
+// compilers support a "no exceptions" mode that disables exceptions.
+//
+// Generally, when ABSL_HAVE_EXCEPTIONS is not defined:
+//
+// * Code using `throw` and `try` may not compile.
+// * The `noexcept` specifier will still compile and behave as normal.
+// * The `noexcept` operator may still return `false`.
+//
+// For further details, consult the compiler's documentation.
+#ifdef ABSL_HAVE_EXCEPTIONS
+#error ABSL_HAVE_EXCEPTIONS cannot be directly set.
+
+#elif defined(__clang__)
+
+#if __clang_major__ > 3 || (__clang_major__ == 3 && __clang_minor__ >= 6)
+// Clang >= 3.6
+#if ABSL_HAVE_FEATURE(cxx_exceptions)
+#define ABSL_HAVE_EXCEPTIONS 1
+#endif // ABSL_HAVE_FEATURE(cxx_exceptions)
+#else
+// Clang < 3.6
+// http://releases.llvm.org/3.6.0/tools/clang/docs/ReleaseNotes.html#the-exceptions-macro
+#if defined(__EXCEPTIONS) && ABSL_HAVE_FEATURE(cxx_exceptions)
+#define ABSL_HAVE_EXCEPTIONS 1
+#endif // defined(__EXCEPTIONS) && ABSL_HAVE_FEATURE(cxx_exceptions)
+#endif // __clang_major__ > 3 || (__clang_major__ == 3 && __clang_minor__ >= 6)
+
+// Handle remaining special cases and default to exceptions being supported.
+#elif !(defined(__GNUC__) && (__GNUC__ < 5) && !defined(__EXCEPTIONS)) && \
+ !(defined(__GNUC__) && (__GNUC__ >= 5) && !defined(__cpp_exceptions)) && \
+ !(defined(_MSC_VER) && !defined(_CPPUNWIND))
+#define ABSL_HAVE_EXCEPTIONS 1
+#endif
+
+// -----------------------------------------------------------------------------
+// Platform Feature Checks
+// -----------------------------------------------------------------------------
+
+// Currently supported operating systems and associated preprocessor
+// symbols:
+//
+// Linux and Linux-derived __linux__
+// Android __ANDROID__ (implies __linux__)
+// Linux (non-Android) __linux__ && !__ANDROID__
+// Darwin (macOS and iOS) __APPLE__
+// Akaros (http://akaros.org) __ros__
+// Windows _WIN32
+// NaCL __native_client__
+// AsmJS __asmjs__
+// WebAssembly __wasm__
+// Fuchsia __Fuchsia__
+//
+// Note that since Android defines both __ANDROID__ and __linux__, one
+// may probe for either Linux or Android by simply testing for __linux__.
+
+// ABSL_HAVE_MMAP
+//
+// Checks whether the platform has an mmap(2) implementation as defined in
+// POSIX.1-2001.
+#ifdef ABSL_HAVE_MMAP
+#error ABSL_HAVE_MMAP cannot be directly set
+#elif defined(__linux__) || defined(__APPLE__) || defined(__FreeBSD__) || \
+ defined(__ros__) || defined(__native_client__) || defined(__asmjs__) || \
+ defined(__wasm__) || defined(__Fuchsia__) || defined(__sun) || \
+ defined(__ASYLO__) || defined(__myriad2__)
+#define ABSL_HAVE_MMAP 1
+#endif
+
+// ABSL_HAVE_PTHREAD_GETSCHEDPARAM
+//
+// Checks whether the platform implements the pthread_(get|set)schedparam(3)
+// functions as defined in POSIX.1-2001.
+#ifdef ABSL_HAVE_PTHREAD_GETSCHEDPARAM
+#error ABSL_HAVE_PTHREAD_GETSCHEDPARAM cannot be directly set
+#elif defined(__linux__) || defined(__APPLE__) || defined(__FreeBSD__) || \
+ defined(__ros__)
+#define ABSL_HAVE_PTHREAD_GETSCHEDPARAM 1
+#endif
+
+// ABSL_HAVE_SCHED_YIELD
+//
+// Checks whether the platform implements sched_yield(2) as defined in
+// POSIX.1-2001.
+#ifdef ABSL_HAVE_SCHED_YIELD
+#error ABSL_HAVE_SCHED_YIELD cannot be directly set
+#elif defined(__linux__) || defined(__ros__) || defined(__native_client__)
+#define ABSL_HAVE_SCHED_YIELD 1
+#endif
+
+// ABSL_HAVE_SEMAPHORE_H
+//
+// Checks whether the platform supports the <semaphore.h> header and sem_init(3)
+// family of functions as standardized in POSIX.1-2001.
+//
+// Note: While Apple provides <semaphore.h> for both iOS and macOS, it is
+// explicitly deprecated and will cause build failures if enabled for those
+// platforms. We side-step the issue by not defining it here for Apple
+// platforms.
+#ifdef ABSL_HAVE_SEMAPHORE_H
+#error ABSL_HAVE_SEMAPHORE_H cannot be directly set
+#elif defined(__linux__) || defined(__ros__)
+#define ABSL_HAVE_SEMAPHORE_H 1
+#endif
+
+// ABSL_HAVE_ALARM
+//
+// Checks whether the platform supports the <signal.h> header and alarm(2)
+// function as standardized in POSIX.1-2001.
+#ifdef ABSL_HAVE_ALARM
+#error ABSL_HAVE_ALARM cannot be directly set
+#elif defined(__GOOGLE_GRTE_VERSION__)
+// feature tests for Google's GRTE
+#define ABSL_HAVE_ALARM 1
+#elif defined(__GLIBC__)
+// feature test for glibc
+#define ABSL_HAVE_ALARM 1
+#elif defined(_MSC_VER)
+// feature tests for Microsoft's library
+#elif defined(__MINGW32__)
+// mingw32 doesn't provide alarm(2):
+// https://osdn.net/projects/mingw/scm/git/mingw-org-wsl/blobs/5.2-trunk/mingwrt/include/unistd.h
+// mingw-w64 provides a no-op implementation:
+// https://sourceforge.net/p/mingw-w64/mingw-w64/ci/master/tree/mingw-w64-crt/misc/alarm.c
+#elif defined(__EMSCRIPTEN__)
+// emscripten doesn't support signals
+#elif defined(__Fuchsia__)
+// Signals don't exist on fuchsia.
+#elif defined(__native_client__)
+#else
+// other standard libraries
+#define ABSL_HAVE_ALARM 1
+#endif
+
+// ABSL_IS_LITTLE_ENDIAN
+// ABSL_IS_BIG_ENDIAN
+//
+// Checks the endianness of the platform.
+//
+// Notes: uses the built in endian macros provided by GCC (since 4.6) and
+// Clang (since 3.2); see
+// https://gcc.gnu.org/onlinedocs/cpp/Common-Predefined-Macros.html.
+// Otherwise, if _WIN32, assume little endian. Otherwise, bail with an error.
+#if defined(ABSL_IS_BIG_ENDIAN)
+#error "ABSL_IS_BIG_ENDIAN cannot be directly set."
+#endif
+#if defined(ABSL_IS_LITTLE_ENDIAN)
+#error "ABSL_IS_LITTLE_ENDIAN cannot be directly set."
+#endif
+
+#if (defined(__BYTE_ORDER__) && defined(__ORDER_LITTLE_ENDIAN__) && \
+ __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__)
+#define ABSL_IS_LITTLE_ENDIAN 1
+#elif defined(__BYTE_ORDER__) && defined(__ORDER_BIG_ENDIAN__) && \
+ __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
+#define ABSL_IS_BIG_ENDIAN 1
+#elif defined(_WIN32)
+#define ABSL_IS_LITTLE_ENDIAN 1
+#else
+#error "absl endian detection needs to be set up for your compiler"
+#endif
+
+// macOS 10.13 and iOS 10.11 don't let you use <any>, <optional>, or <variant>
+// even though the headers exist and are publicly noted to work. See
+// https://github.com/abseil/abseil-cpp/issues/207 and
+// https://developer.apple.com/documentation/xcode_release_notes/xcode_10_release_notes
+// libc++ spells out the availability requirements in the file
+// llvm-project/libcxx/include/__config via the #define
+// _LIBCPP_AVAILABILITY_BAD_OPTIONAL_ACCESS.
+#if defined(__APPLE__) && defined(_LIBCPP_VERSION) && \
+ ((defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && \
+ __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 101400) || \
+ (defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && \
+ __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 120000) || \
+ (defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__) && \
+ __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ < 50000) || \
+ (defined(__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__) && \
+ __ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__ < 120000))
+#define ABSL_INTERNAL_APPLE_CXX17_TYPES_UNAVAILABLE 1
+#else
+#define ABSL_INTERNAL_APPLE_CXX17_TYPES_UNAVAILABLE 0
+#endif
+
+// ABSL_HAVE_STD_ANY
+//
+// Checks whether C++17 std::any is available by checking whether <any> exists.
+#ifdef ABSL_HAVE_STD_ANY
+#error "ABSL_HAVE_STD_ANY cannot be directly set."
+#endif
+
+#ifdef __has_include
+#if __has_include(<any>) && __cplusplus >= 201703L && \
+ !ABSL_INTERNAL_APPLE_CXX17_TYPES_UNAVAILABLE
+#define ABSL_HAVE_STD_ANY 1
+#endif
+#endif
+
+// ABSL_HAVE_STD_OPTIONAL
+//
+// Checks whether C++17 std::optional is available.
+#ifdef ABSL_HAVE_STD_OPTIONAL
+#error "ABSL_HAVE_STD_OPTIONAL cannot be directly set."
+#endif
+
+#ifdef __has_include
+#if __has_include(<optional>) && __cplusplus >= 201703L && \
+ !ABSL_INTERNAL_APPLE_CXX17_TYPES_UNAVAILABLE
+#define ABSL_HAVE_STD_OPTIONAL 1
+#endif
+#endif
+
+// ABSL_HAVE_STD_VARIANT
+//
+// Checks whether C++17 std::variant is available.
+#ifdef ABSL_HAVE_STD_VARIANT
+#error "ABSL_HAVE_STD_VARIANT cannot be directly set."
+#endif
+
+#ifdef __has_include
+#if __has_include(<variant>) && __cplusplus >= 201703L && \
+ !ABSL_INTERNAL_APPLE_CXX17_TYPES_UNAVAILABLE
+#define ABSL_HAVE_STD_VARIANT 1
+#endif
+#endif
+
+// ABSL_HAVE_STD_STRING_VIEW
+//
+// Checks whether C++17 std::string_view is available.
+#ifdef ABSL_HAVE_STD_STRING_VIEW
+#error "ABSL_HAVE_STD_STRING_VIEW cannot be directly set."
+#endif
+
+#ifdef __has_include
+#if __has_include(<string_view>) && __cplusplus >= 201703L
+#define ABSL_HAVE_STD_STRING_VIEW 1
+#endif
+#endif
+
+// For MSVC, `__has_include` is supported in VS 2017 15.3, which is later than
+// the support for <optional>, <any>, <string_view>, <variant>. So we use
+// _MSC_VER to check whether we have VS 2017 RTM (when <optional>, <any>,
+// <string_view>, <variant> is implemented) or higher. Also, `__cplusplus` is
+// not correctly set by MSVC, so we use `_MSVC_LANG` to check the language
+// version.
+// TODO(zhangxy): fix tests before enabling aliasing for `std::any`.
+#if defined(_MSC_VER) && _MSC_VER >= 1910 && \
+ ((defined(_MSVC_LANG) && _MSVC_LANG > 201402) || __cplusplus > 201402)
+// #define ABSL_HAVE_STD_ANY 1
+#define ABSL_HAVE_STD_OPTIONAL 1
+#define ABSL_HAVE_STD_VARIANT 1
+#define ABSL_HAVE_STD_STRING_VIEW 1
+#endif
+
+// ABSL_USES_STD_ANY
+//
+// Indicates whether absl::any is an alias for std::any.
+#if !defined(ABSL_OPTION_USE_STD_ANY)
+#error options.h is misconfigured.
+#elif ABSL_OPTION_USE_STD_ANY == 0 || \
+ (ABSL_OPTION_USE_STD_ANY == 2 && !defined(ABSL_HAVE_STD_ANY))
+#undef ABSL_USES_STD_ANY
+#elif ABSL_OPTION_USE_STD_ANY == 1 || \
+ (ABSL_OPTION_USE_STD_ANY == 2 && defined(ABSL_HAVE_STD_ANY))
+#define ABSL_USES_STD_ANY 1
+#else
+#error options.h is misconfigured.
+#endif
+
+// ABSL_USES_STD_OPTIONAL
+//
+// Indicates whether absl::optional is an alias for std::optional.
+#if !defined(ABSL_OPTION_USE_STD_OPTIONAL)
+#error options.h is misconfigured.
+#elif ABSL_OPTION_USE_STD_OPTIONAL == 0 || \
+ (ABSL_OPTION_USE_STD_OPTIONAL == 2 && !defined(ABSL_HAVE_STD_OPTIONAL))
+#undef ABSL_USES_STD_OPTIONAL
+#elif ABSL_OPTION_USE_STD_OPTIONAL == 1 || \
+ (ABSL_OPTION_USE_STD_OPTIONAL == 2 && defined(ABSL_HAVE_STD_OPTIONAL))
+#define ABSL_USES_STD_OPTIONAL 1
+#else
+#error options.h is misconfigured.
+#endif
+
+// ABSL_USES_STD_VARIANT
+//
+// Indicates whether absl::variant is an alias for std::variant.
+#if !defined(ABSL_OPTION_USE_STD_VARIANT)
+#error options.h is misconfigured.
+#elif ABSL_OPTION_USE_STD_VARIANT == 0 || \
+ (ABSL_OPTION_USE_STD_VARIANT == 2 && !defined(ABSL_HAVE_STD_VARIANT))
+#undef ABSL_USES_STD_VARIANT
+#elif ABSL_OPTION_USE_STD_VARIANT == 1 || \
+ (ABSL_OPTION_USE_STD_VARIANT == 2 && defined(ABSL_HAVE_STD_VARIANT))
+#define ABSL_USES_STD_VARIANT 1
+#else
+#error options.h is misconfigured.
+#endif
+
+// ABSL_USES_STD_STRING_VIEW
+//
+// Indicates whether absl::string_view is an alias for std::string_view.
+#if !defined(ABSL_OPTION_USE_STD_STRING_VIEW)
+#error options.h is misconfigured.
+#elif ABSL_OPTION_USE_STD_STRING_VIEW == 0 || \
+ (ABSL_OPTION_USE_STD_STRING_VIEW == 2 && \
+ !defined(ABSL_HAVE_STD_STRING_VIEW))
+#undef ABSL_USES_STD_STRING_VIEW
+#elif ABSL_OPTION_USE_STD_STRING_VIEW == 1 || \
+ (ABSL_OPTION_USE_STD_STRING_VIEW == 2 && \
+ defined(ABSL_HAVE_STD_STRING_VIEW))
+#define ABSL_USES_STD_STRING_VIEW 1
+#else
+#error options.h is misconfigured.
+#endif
+
+// In debug mode, MSVC 2017's std::variant throws a EXCEPTION_ACCESS_VIOLATION
+// SEH exception from emplace for variant<SomeStruct> when constructing the
+// struct can throw. This defeats some of variant_test and
+// variant_exception_safety_test.
+#if defined(_MSC_VER) && _MSC_VER >= 1700 && defined(_DEBUG)
+#define ABSL_INTERNAL_MSVC_2017_DBG_MODE
+#endif
+
+// ABSL_INTERNAL_MANGLED_NS
+// ABSL_INTERNAL_MANGLED_BACKREFERENCE
+//
+// Internal macros for building up mangled names in our internal fork of CCTZ.
+// This implementation detail is only needed and provided for the MSVC build.
+//
+// These macros both expand to string literals. ABSL_INTERNAL_MANGLED_NS is
+// the mangled spelling of the `absl` namespace, and
+// ABSL_INTERNAL_MANGLED_BACKREFERENCE is a back-reference integer representing
+// the proper count to skip past the CCTZ fork namespace names. (This number
+// is one larger when there is an inline namespace name to skip.)
+#if defined(_MSC_VER)
+#if ABSL_OPTION_USE_INLINE_NAMESPACE == 0
+#define ABSL_INTERNAL_MANGLED_NS "absl"
+#define ABSL_INTERNAL_MANGLED_BACKREFERENCE "5"
+#else
+#define ABSL_INTERNAL_MANGLED_NS \
+ ABSL_INTERNAL_TOKEN_STR(ABSL_OPTION_INLINE_NAMESPACE_NAME) "@absl"
+#define ABSL_INTERNAL_MANGLED_BACKREFERENCE "6"
+#endif
+#endif
+
+#undef ABSL_INTERNAL_HAS_KEYWORD
+
+// ABSL_DLL
+//
+// When building Abseil as a DLL, this macro expands to `__declspec(dllexport)`
+// so we can annotate symbols appropriately as being exported. When used in
+// headers consuming a DLL, this macro expands to `__declspec(dllimport)` so
+// that consumers know the symbol is defined inside the DLL. In all other cases,
+// the macro expands to nothing.
+#if defined(_MSC_VER)
+#if defined(ABSL_BUILD_DLL)
+#define ABSL_DLL __declspec(dllexport)
+#elif defined(ABSL_CONSUME_DLL)
+#define ABSL_DLL __declspec(dllimport)
+#else
+#define ABSL_DLL
+#endif
+#else
+#define ABSL_DLL
+#endif // defined(_MSC_VER)
+
+// ABSL_HAVE_MEMORY_SANITIZER
+//
+// MemorySanitizer (MSan) is a detector of uninitialized reads. It consists of
+// a compiler instrumentation module and a run-time library.
+#ifdef ABSL_HAVE_MEMORY_SANITIZER
+#error "ABSL_HAVE_MEMORY_SANITIZER cannot be directly set."
+#elif defined(MEMORY_SANITIZER)
+// The MEMORY_SANITIZER macro is deprecated but we will continue to honor it
+// for now.
+#define ABSL_HAVE_MEMORY_SANITIZER 1
+#elif defined(__SANITIZE_MEMORY__)
+#define ABSL_HAVE_MEMORY_SANITIZER 1
+#elif !defined(__native_client__) && ABSL_HAVE_FEATURE(memory_sanitizer)
+#define ABSL_HAVE_MEMORY_SANITIZER 1
+#endif
+
+// ABSL_HAVE_THREAD_SANITIZER
+//
+// ThreadSanitizer (TSan) is a fast data race detector.
+#ifdef ABSL_HAVE_THREAD_SANITIZER
+#error "ABSL_HAVE_THREAD_SANITIZER cannot be directly set."
+#elif defined(THREAD_SANITIZER)
+// The THREAD_SANITIZER macro is deprecated but we will continue to honor it
+// for now.
+#define ABSL_HAVE_THREAD_SANITIZER 1
+#elif defined(__SANITIZE_THREAD__)
+#define ABSL_HAVE_THREAD_SANITIZER 1
+#elif ABSL_HAVE_FEATURE(thread_sanitizer)
+#define ABSL_HAVE_THREAD_SANITIZER 1
+#endif
+
+// ABSL_HAVE_ADDRESS_SANITIZER
+//
+// AddressSanitizer (ASan) is a fast memory error detector.
+#ifdef ABSL_HAVE_ADDRESS_SANITIZER
+#error "ABSL_HAVE_ADDRESS_SANITIZER cannot be directly set."
+#elif defined(ADDRESS_SANITIZER)
+// The ADDRESS_SANITIZER macro is deprecated but we will continue to honor it
+// for now.
+#define ABSL_HAVE_ADDRESS_SANITIZER 1
+#elif defined(__SANITIZE_ADDRESS__)
+#define ABSL_HAVE_ADDRESS_SANITIZER 1
+#elif ABSL_HAVE_FEATURE(address_sanitizer)
+#define ABSL_HAVE_ADDRESS_SANITIZER 1
+#endif
+
+#endif // ABSL_BASE_CONFIG_H_
diff --git a/third_party/abseil/src/absl/base/config_test.cc b/third_party/abseil/src/absl/base/config_test.cc
new file mode 100644
index 0000000..7e0c033
--- /dev/null
+++ b/third_party/abseil/src/absl/base/config_test.cc
@@ -0,0 +1,60 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/base/config.h"
+
+#include <cstdint>
+
+#include "gtest/gtest.h"
+#include "absl/synchronization/internal/thread_pool.h"
+
+namespace {
+
+TEST(ConfigTest, Endianness) {
+ union {
+ uint32_t value;
+ uint8_t data[sizeof(uint32_t)];
+ } number;
+ number.data[0] = 0x00;
+ number.data[1] = 0x01;
+ number.data[2] = 0x02;
+ number.data[3] = 0x03;
+#if defined(ABSL_IS_LITTLE_ENDIAN) && defined(ABSL_IS_BIG_ENDIAN)
+#error Both ABSL_IS_LITTLE_ENDIAN and ABSL_IS_BIG_ENDIAN are defined
+#elif defined(ABSL_IS_LITTLE_ENDIAN)
+ EXPECT_EQ(UINT32_C(0x03020100), number.value);
+#elif defined(ABSL_IS_BIG_ENDIAN)
+ EXPECT_EQ(UINT32_C(0x00010203), number.value);
+#else
+#error Unknown endianness
+#endif
+}
+
+#if defined(ABSL_HAVE_THREAD_LOCAL)
+TEST(ConfigTest, ThreadLocal) {
+ static thread_local int mine_mine_mine = 16;
+ EXPECT_EQ(16, mine_mine_mine);
+ {
+ absl::synchronization_internal::ThreadPool pool(1);
+ pool.Schedule([&] {
+ EXPECT_EQ(16, mine_mine_mine);
+ mine_mine_mine = 32;
+ EXPECT_EQ(32, mine_mine_mine);
+ });
+ }
+ EXPECT_EQ(16, mine_mine_mine);
+}
+#endif
+
+} // namespace
diff --git a/third_party/abseil/src/absl/base/const_init.h b/third_party/abseil/src/absl/base/const_init.h
new file mode 100644
index 0000000..16520b6
--- /dev/null
+++ b/third_party/abseil/src/absl/base/const_init.h
@@ -0,0 +1,76 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// kConstInit
+// -----------------------------------------------------------------------------
+//
+// A constructor tag used to mark an object as safe for use as a global
+// variable, avoiding the usual lifetime issues that can affect globals.
+
+#ifndef ABSL_BASE_CONST_INIT_H_
+#define ABSL_BASE_CONST_INIT_H_
+
+#include "absl/base/config.h"
+
+// In general, objects with static storage duration (such as global variables)
+// can trigger tricky object lifetime situations. Attempting to access them
+// from the constructors or destructors of other global objects can result in
+// undefined behavior, unless their constructors and destructors are designed
+// with this issue in mind.
+//
+// The normal way to deal with this issue in C++11 is to use constant
+// initialization and trivial destructors.
+//
+// Constant initialization is guaranteed to occur before any other code
+// executes. Constructors that are declared 'constexpr' are eligible for
+// constant initialization. You can annotate a variable declaration with the
+// ABSL_CONST_INIT macro to express this intent. For compilers that support
+// it, this annotation will cause a compilation error for declarations that
+// aren't subject to constant initialization (perhaps because a runtime value
+// was passed as a constructor argument).
+//
+// On program shutdown, lifetime issues can be avoided on global objects by
+// ensuring that they contain trivial destructors. A class has a trivial
+// destructor unless it has a user-defined destructor, a virtual method or base
+// class, or a data member or base class with a non-trivial destructor of its
+// own. Objects with static storage duration and a trivial destructor are not
+// cleaned up on program shutdown, and are thus safe to access from other code
+// running during shutdown.
+//
+// For a few core Abseil classes, we make a best effort to allow for safe global
+// instances, even though these classes have non-trivial destructors. These
+// objects can be created with the absl::kConstInit tag. For example:
+// ABSL_CONST_INIT absl::Mutex global_mutex(absl::kConstInit);
+//
+// The line above declares a global variable of type absl::Mutex which can be
+// accessed at any point during startup or shutdown. global_mutex's destructor
+// will still run, but will not invalidate the object. Note that C++ specifies
+// that accessing an object after its destructor has run results in undefined
+// behavior, but this pattern works on the toolchains we support.
+//
+// The absl::kConstInit tag should only be used to define objects with static
+// or thread_local storage duration.
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+enum ConstInitType {
+ kConstInit,
+};
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_BASE_CONST_INIT_H_
diff --git a/third_party/abseil/src/absl/base/dynamic_annotations.h b/third_party/abseil/src/absl/base/dynamic_annotations.h
new file mode 100644
index 0000000..545f8cb
--- /dev/null
+++ b/third_party/abseil/src/absl/base/dynamic_annotations.h
@@ -0,0 +1,482 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// This file defines dynamic annotations for use with dynamic analysis tool
+// such as valgrind, PIN, etc.
+//
+// Dynamic annotation is a source code annotation that affects the generated
+// code (that is, the annotation is not a comment). Each such annotation is
+// attached to a particular instruction and/or to a particular object (address)
+// in the program.
+//
+// The annotations that should be used by users are macros in all upper-case
+// (e.g., ABSL_ANNOTATE_THREAD_NAME).
+//
+// Actual implementation of these macros may differ depending on the dynamic
+// analysis tool being used.
+//
+// This file supports the following configurations:
+// - Dynamic Annotations enabled (with static thread-safety warnings disabled).
+// In this case, macros expand to functions implemented by Thread Sanitizer,
+// when building with TSan. When not provided an external implementation,
+// dynamic_annotations.cc provides no-op implementations.
+//
+// - Static Clang thread-safety warnings enabled.
+// When building with a Clang compiler that supports thread-safety warnings,
+// a subset of annotations can be statically-checked at compile-time. We
+// expand these macros to static-inline functions that can be analyzed for
+// thread-safety, but afterwards elided when building the final binary.
+//
+// - All annotations are disabled.
+// If neither Dynamic Annotations nor Clang thread-safety warnings are
+// enabled, then all annotation-macros expand to empty.
+
+#ifndef ABSL_BASE_DYNAMIC_ANNOTATIONS_H_
+#define ABSL_BASE_DYNAMIC_ANNOTATIONS_H_
+
+#include <stddef.h>
+
+#include "absl/base/attributes.h"
+#include "absl/base/config.h"
+#ifdef __cplusplus
+#include "absl/base/macros.h"
+#endif
+
+// TODO(rogeeff): Remove after the backward compatibility period.
+#include "absl/base/internal/dynamic_annotations.h" // IWYU pragma: export
+
+// -------------------------------------------------------------------------
+// Decide which features are enabled.
+
+#ifdef ABSL_HAVE_THREAD_SANITIZER
+
+#define ABSL_INTERNAL_RACE_ANNOTATIONS_ENABLED 1
+#define ABSL_INTERNAL_READS_ANNOTATIONS_ENABLED 1
+#define ABSL_INTERNAL_WRITES_ANNOTATIONS_ENABLED 1
+#define ABSL_INTERNAL_ANNOTALYSIS_ENABLED 0
+#define ABSL_INTERNAL_READS_WRITES_ANNOTATIONS_ENABLED 1
+
+#else
+
+#define ABSL_INTERNAL_RACE_ANNOTATIONS_ENABLED 0
+#define ABSL_INTERNAL_READS_ANNOTATIONS_ENABLED 0
+#define ABSL_INTERNAL_WRITES_ANNOTATIONS_ENABLED 0
+
+// Clang provides limited support for static thread-safety analysis through a
+// feature called Annotalysis. We configure macro-definitions according to
+// whether Annotalysis support is available. When running in opt-mode, GCC
+// will issue a warning, if these attributes are compiled. Only include them
+// when compiling using Clang.
+
+#if defined(__clang__)
+#define ABSL_INTERNAL_ANNOTALYSIS_ENABLED 1
+#if !defined(SWIG)
+#define ABSL_INTERNAL_IGNORE_READS_ATTRIBUTE_ENABLED 1
+#endif
+#else
+#define ABSL_INTERNAL_ANNOTALYSIS_ENABLED 0
+#endif
+
+// Read/write annotations are enabled in Annotalysis mode; disabled otherwise.
+#define ABSL_INTERNAL_READS_WRITES_ANNOTATIONS_ENABLED \
+ ABSL_INTERNAL_ANNOTALYSIS_ENABLED
+
+#endif // ABSL_HAVE_THREAD_SANITIZER
+
+#ifdef __cplusplus
+#define ABSL_INTERNAL_BEGIN_EXTERN_C extern "C" {
+#define ABSL_INTERNAL_END_EXTERN_C } // extern "C"
+#define ABSL_INTERNAL_GLOBAL_SCOPED(F) ::F
+#define ABSL_INTERNAL_STATIC_INLINE inline
+#else
+#define ABSL_INTERNAL_BEGIN_EXTERN_C // empty
+#define ABSL_INTERNAL_END_EXTERN_C // empty
+#define ABSL_INTERNAL_GLOBAL_SCOPED(F) F
+#define ABSL_INTERNAL_STATIC_INLINE static inline
+#endif
+
+// -------------------------------------------------------------------------
+// Define race annotations.
+
+#if ABSL_INTERNAL_RACE_ANNOTATIONS_ENABLED == 1
+
+// -------------------------------------------------------------
+// Annotations that suppress errors. It is usually better to express the
+// program's synchronization using the other annotations, but these can be used
+// when all else fails.
+
+// Report that we may have a benign race at `pointer`, with size
+// "sizeof(*(pointer))". `pointer` must be a non-void* pointer. Insert at the
+// point where `pointer` has been allocated, preferably close to the point
+// where the race happens. See also ABSL_ANNOTATE_BENIGN_RACE_STATIC.
+#define ABSL_ANNOTATE_BENIGN_RACE(pointer, description) \
+ ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateBenignRaceSized) \
+ (__FILE__, __LINE__, pointer, sizeof(*(pointer)), description)
+
+// Same as ABSL_ANNOTATE_BENIGN_RACE(`address`, `description`), but applies to
+// the memory range [`address`, `address`+`size`).
+#define ABSL_ANNOTATE_BENIGN_RACE_SIZED(address, size, description) \
+ ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateBenignRaceSized) \
+ (__FILE__, __LINE__, address, size, description)
+
+// Enable (`enable`!=0) or disable (`enable`==0) race detection for all threads.
+// This annotation could be useful if you want to skip expensive race analysis
+// during some period of program execution, e.g. during initialization.
+#define ABSL_ANNOTATE_ENABLE_RACE_DETECTION(enable) \
+ ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateEnableRaceDetection) \
+ (__FILE__, __LINE__, enable)
+
+// -------------------------------------------------------------
+// Annotations useful for debugging.
+
+// Report the current thread `name` to a race detector.
+#define ABSL_ANNOTATE_THREAD_NAME(name) \
+ ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateThreadName)(__FILE__, __LINE__, name)
+
+// -------------------------------------------------------------
+// Annotations useful when implementing locks. They are not normally needed by
+// modules that merely use locks. The `lock` argument is a pointer to the lock
+// object.
+
+// Report that a lock has been created at address `lock`.
+#define ABSL_ANNOTATE_RWLOCK_CREATE(lock) \
+ ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateRWLockCreate)(__FILE__, __LINE__, lock)
+
+// Report that a linker initialized lock has been created at address `lock`.
+#ifdef ABSL_HAVE_THREAD_SANITIZER
+#define ABSL_ANNOTATE_RWLOCK_CREATE_STATIC(lock) \
+ ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateRWLockCreateStatic) \
+ (__FILE__, __LINE__, lock)
+#else
+#define ABSL_ANNOTATE_RWLOCK_CREATE_STATIC(lock) \
+ ABSL_ANNOTATE_RWLOCK_CREATE(lock)
+#endif
+
+// Report that the lock at address `lock` is about to be destroyed.
+#define ABSL_ANNOTATE_RWLOCK_DESTROY(lock) \
+ ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateRWLockDestroy)(__FILE__, __LINE__, lock)
+
+// Report that the lock at address `lock` has been acquired.
+// `is_w`=1 for writer lock, `is_w`=0 for reader lock.
+#define ABSL_ANNOTATE_RWLOCK_ACQUIRED(lock, is_w) \
+ ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateRWLockAcquired) \
+ (__FILE__, __LINE__, lock, is_w)
+
+// Report that the lock at address `lock` is about to be released.
+// `is_w`=1 for writer lock, `is_w`=0 for reader lock.
+#define ABSL_ANNOTATE_RWLOCK_RELEASED(lock, is_w) \
+ ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateRWLockReleased) \
+ (__FILE__, __LINE__, lock, is_w)
+
+// Apply ABSL_ANNOTATE_BENIGN_RACE_SIZED to a static variable `static_var`.
+#define ABSL_ANNOTATE_BENIGN_RACE_STATIC(static_var, description) \
+ namespace { \
+ class static_var##_annotator { \
+ public: \
+ static_var##_annotator() { \
+ ABSL_ANNOTATE_BENIGN_RACE_SIZED(&static_var, sizeof(static_var), \
+ #static_var ": " description); \
+ } \
+ }; \
+ static static_var##_annotator the##static_var##_annotator; \
+ } // namespace
+
+// Function prototypes of annotations provided by the compiler-based sanitizer
+// implementation.
+ABSL_INTERNAL_BEGIN_EXTERN_C
+void AnnotateRWLockCreate(const char* file, int line,
+ const volatile void* lock);
+void AnnotateRWLockCreateStatic(const char* file, int line,
+ const volatile void* lock);
+void AnnotateRWLockDestroy(const char* file, int line,
+ const volatile void* lock);
+void AnnotateRWLockAcquired(const char* file, int line,
+ const volatile void* lock, long is_w); // NOLINT
+void AnnotateRWLockReleased(const char* file, int line,
+ const volatile void* lock, long is_w); // NOLINT
+void AnnotateBenignRace(const char* file, int line,
+ const volatile void* address, const char* description);
+void AnnotateBenignRaceSized(const char* file, int line,
+ const volatile void* address, size_t size,
+ const char* description);
+void AnnotateThreadName(const char* file, int line, const char* name);
+void AnnotateEnableRaceDetection(const char* file, int line, int enable);
+ABSL_INTERNAL_END_EXTERN_C
+
+#else // ABSL_INTERNAL_RACE_ANNOTATIONS_ENABLED == 0
+
+#define ABSL_ANNOTATE_RWLOCK_CREATE(lock) // empty
+#define ABSL_ANNOTATE_RWLOCK_CREATE_STATIC(lock) // empty
+#define ABSL_ANNOTATE_RWLOCK_DESTROY(lock) // empty
+#define ABSL_ANNOTATE_RWLOCK_ACQUIRED(lock, is_w) // empty
+#define ABSL_ANNOTATE_RWLOCK_RELEASED(lock, is_w) // empty
+#define ABSL_ANNOTATE_BENIGN_RACE(address, description) // empty
+#define ABSL_ANNOTATE_BENIGN_RACE_SIZED(address, size, description) // empty
+#define ABSL_ANNOTATE_THREAD_NAME(name) // empty
+#define ABSL_ANNOTATE_ENABLE_RACE_DETECTION(enable) // empty
+#define ABSL_ANNOTATE_BENIGN_RACE_STATIC(static_var, description) // empty
+
+#endif // ABSL_INTERNAL_RACE_ANNOTATIONS_ENABLED
+
+// -------------------------------------------------------------------------
+// Define memory annotations.
+
+#ifdef ABSL_HAVE_MEMORY_SANITIZER
+
+#include <sanitizer/msan_interface.h>
+
+#define ABSL_ANNOTATE_MEMORY_IS_INITIALIZED(address, size) \
+ __msan_unpoison(address, size)
+
+#define ABSL_ANNOTATE_MEMORY_IS_UNINITIALIZED(address, size) \
+ __msan_allocated_memory(address, size)
+
+#else // !defined(ABSL_HAVE_MEMORY_SANITIZER)
+
+// TODO(rogeeff): remove this branch
+#ifdef ABSL_HAVE_THREAD_SANITIZER
+#define ABSL_ANNOTATE_MEMORY_IS_INITIALIZED(address, size) \
+ do { \
+ (void)(address); \
+ (void)(size); \
+ } while (0)
+#define ABSL_ANNOTATE_MEMORY_IS_UNINITIALIZED(address, size) \
+ do { \
+ (void)(address); \
+ (void)(size); \
+ } while (0)
+#else
+
+#define ABSL_ANNOTATE_MEMORY_IS_INITIALIZED(address, size) // empty
+#define ABSL_ANNOTATE_MEMORY_IS_UNINITIALIZED(address, size) // empty
+
+#endif
+
+#endif // ABSL_HAVE_MEMORY_SANITIZER
+
+// -------------------------------------------------------------------------
+// Define IGNORE_READS_BEGIN/_END attributes.
+
+#if defined(ABSL_INTERNAL_IGNORE_READS_ATTRIBUTE_ENABLED)
+
+#define ABSL_INTERNAL_IGNORE_READS_BEGIN_ATTRIBUTE \
+ __attribute((exclusive_lock_function("*")))
+#define ABSL_INTERNAL_IGNORE_READS_END_ATTRIBUTE \
+ __attribute((unlock_function("*")))
+
+#else // !defined(ABSL_INTERNAL_IGNORE_READS_ATTRIBUTE_ENABLED)
+
+#define ABSL_INTERNAL_IGNORE_READS_BEGIN_ATTRIBUTE // empty
+#define ABSL_INTERNAL_IGNORE_READS_END_ATTRIBUTE // empty
+
+#endif // defined(ABSL_INTERNAL_IGNORE_READS_ATTRIBUTE_ENABLED)
+
+// -------------------------------------------------------------------------
+// Define IGNORE_READS_BEGIN/_END annotations.
+
+#if ABSL_INTERNAL_READS_ANNOTATIONS_ENABLED == 1
+
+// Request the analysis tool to ignore all reads in the current thread until
+// ABSL_ANNOTATE_IGNORE_READS_END is called. Useful to ignore intentional racey
+// reads, while still checking other reads and all writes.
+// See also ABSL_ANNOTATE_UNPROTECTED_READ.
+#define ABSL_ANNOTATE_IGNORE_READS_BEGIN() \
+ ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateIgnoreReadsBegin)(__FILE__, __LINE__)
+
+// Stop ignoring reads.
+#define ABSL_ANNOTATE_IGNORE_READS_END() \
+ ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateIgnoreReadsEnd)(__FILE__, __LINE__)
+
+// Function prototypes of annotations provided by the compiler-based sanitizer
+// implementation.
+ABSL_INTERNAL_BEGIN_EXTERN_C
+void AnnotateIgnoreReadsBegin(const char* file, int line)
+ ABSL_INTERNAL_IGNORE_READS_BEGIN_ATTRIBUTE;
+void AnnotateIgnoreReadsEnd(const char* file,
+ int line) ABSL_INTERNAL_IGNORE_READS_END_ATTRIBUTE;
+ABSL_INTERNAL_END_EXTERN_C
+
+#elif defined(ABSL_INTERNAL_ANNOTALYSIS_ENABLED)
+
+// When Annotalysis is enabled without Dynamic Annotations, the use of
+// static-inline functions allows the annotations to be read at compile-time,
+// while still letting the compiler elide the functions from the final build.
+//
+// TODO(delesley) -- The exclusive lock here ignores writes as well, but
+// allows IGNORE_READS_AND_WRITES to work properly.
+
+#define ABSL_ANNOTATE_IGNORE_READS_BEGIN() \
+ ABSL_INTERNAL_GLOBAL_SCOPED(AbslInternalAnnotateIgnoreReadsBegin)()
+
+#define ABSL_ANNOTATE_IGNORE_READS_END() \
+ ABSL_INTERNAL_GLOBAL_SCOPED(AbslInternalAnnotateIgnoreReadsEnd)()
+
+ABSL_INTERNAL_STATIC_INLINE void AbslInternalAnnotateIgnoreReadsBegin()
+ ABSL_INTERNAL_IGNORE_READS_BEGIN_ATTRIBUTE {}
+
+ABSL_INTERNAL_STATIC_INLINE void AbslInternalAnnotateIgnoreReadsEnd()
+ ABSL_INTERNAL_IGNORE_READS_END_ATTRIBUTE {}
+
+#else
+
+#define ABSL_ANNOTATE_IGNORE_READS_BEGIN() // empty
+#define ABSL_ANNOTATE_IGNORE_READS_END() // empty
+
+#endif
+
+// -------------------------------------------------------------------------
+// Define IGNORE_WRITES_BEGIN/_END annotations.
+
+#if ABSL_INTERNAL_WRITES_ANNOTATIONS_ENABLED == 1
+
+// Similar to ABSL_ANNOTATE_IGNORE_READS_BEGIN, but ignore writes instead.
+#define ABSL_ANNOTATE_IGNORE_WRITES_BEGIN() \
+ ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateIgnoreWritesBegin)(__FILE__, __LINE__)
+
+// Stop ignoring writes.
+#define ABSL_ANNOTATE_IGNORE_WRITES_END() \
+ ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateIgnoreWritesEnd)(__FILE__, __LINE__)
+
+// Function prototypes of annotations provided by the compiler-based sanitizer
+// implementation.
+ABSL_INTERNAL_BEGIN_EXTERN_C
+void AnnotateIgnoreWritesBegin(const char* file, int line);
+void AnnotateIgnoreWritesEnd(const char* file, int line);
+ABSL_INTERNAL_END_EXTERN_C
+
+#else
+
+#define ABSL_ANNOTATE_IGNORE_WRITES_BEGIN() // empty
+#define ABSL_ANNOTATE_IGNORE_WRITES_END() // empty
+
+#endif
+
+// -------------------------------------------------------------------------
+// Define the ABSL_ANNOTATE_IGNORE_READS_AND_WRITES_* annotations using the more
+// primitive annotations defined above.
+//
+// Instead of doing
+// ABSL_ANNOTATE_IGNORE_READS_BEGIN();
+// ... = x;
+// ABSL_ANNOTATE_IGNORE_READS_END();
+// one can use
+// ... = ABSL_ANNOTATE_UNPROTECTED_READ(x);
+
+#if defined(ABSL_INTERNAL_READS_WRITES_ANNOTATIONS_ENABLED)
+
+// Start ignoring all memory accesses (both reads and writes).
+#define ABSL_ANNOTATE_IGNORE_READS_AND_WRITES_BEGIN() \
+ do { \
+ ABSL_ANNOTATE_IGNORE_READS_BEGIN(); \
+ ABSL_ANNOTATE_IGNORE_WRITES_BEGIN(); \
+ } while (0)
+
+// Stop ignoring both reads and writes.
+#define ABSL_ANNOTATE_IGNORE_READS_AND_WRITES_END() \
+ do { \
+ ABSL_ANNOTATE_IGNORE_WRITES_END(); \
+ ABSL_ANNOTATE_IGNORE_READS_END(); \
+ } while (0)
+
+#ifdef __cplusplus
+// ABSL_ANNOTATE_UNPROTECTED_READ is the preferred way to annotate racey reads.
+#define ABSL_ANNOTATE_UNPROTECTED_READ(x) \
+ absl::base_internal::AnnotateUnprotectedRead(x)
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace base_internal {
+
+template <typename T>
+inline T AnnotateUnprotectedRead(const volatile T& x) { // NOLINT
+ ABSL_ANNOTATE_IGNORE_READS_BEGIN();
+ T res = x;
+ ABSL_ANNOTATE_IGNORE_READS_END();
+ return res;
+}
+
+} // namespace base_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+#endif
+
+#else
+
+#define ABSL_ANNOTATE_IGNORE_READS_AND_WRITES_BEGIN() // empty
+#define ABSL_ANNOTATE_IGNORE_READS_AND_WRITES_END() // empty
+#define ABSL_ANNOTATE_UNPROTECTED_READ(x) (x)
+
+#endif
+
+#ifdef __cplusplus
+#ifdef ABSL_HAVE_THREAD_SANITIZER
+ABSL_INTERNAL_BEGIN_EXTERN_C
+int RunningOnValgrind();
+double ValgrindSlowdown();
+ABSL_INTERNAL_END_EXTERN_C
+#else
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace base_internal {
+ABSL_DEPRECATED(
+ "Don't use this interface. It is misleading and is being deleted.")
+ABSL_ATTRIBUTE_ALWAYS_INLINE inline int RunningOnValgrind() { return 0; }
+ABSL_DEPRECATED(
+ "Don't use this interface. It is misleading and is being deleted.")
+ABSL_ATTRIBUTE_ALWAYS_INLINE inline double ValgrindSlowdown() { return 1.0; }
+} // namespace base_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+using absl::base_internal::RunningOnValgrind;
+using absl::base_internal::ValgrindSlowdown;
+#endif
+#endif
+
+// -------------------------------------------------------------------------
+// Address sanitizer annotations
+
+#ifdef ABSL_HAVE_ADDRESS_SANITIZER
+// Describe the current state of a contiguous container such as e.g.
+// std::vector or std::string. For more details see
+// sanitizer/common_interface_defs.h, which is provided by the compiler.
+#include <sanitizer/common_interface_defs.h>
+
+#define ABSL_ANNOTATE_CONTIGUOUS_CONTAINER(beg, end, old_mid, new_mid) \
+ __sanitizer_annotate_contiguous_container(beg, end, old_mid, new_mid)
+#define ABSL_ADDRESS_SANITIZER_REDZONE(name) \
+ struct { \
+ char x[8] __attribute__((aligned(8))); \
+ } name
+
+#else
+
+#define ABSL_ANNOTATE_CONTIGUOUS_CONTAINER(beg, end, old_mid, new_mid) // empty
+#define ABSL_ADDRESS_SANITIZER_REDZONE(name) static_assert(true, "")
+
+#endif // ABSL_HAVE_ADDRESS_SANITIZER
+
+// -------------------------------------------------------------------------
+// Undefine the macros intended only for this file.
+
+#undef ABSL_INTERNAL_RACE_ANNOTATIONS_ENABLED
+#undef ABSL_INTERNAL_READS_ANNOTATIONS_ENABLED
+#undef ABSL_INTERNAL_WRITES_ANNOTATIONS_ENABLED
+#undef ABSL_INTERNAL_ANNOTALYSIS_ENABLED
+#undef ABSL_INTERNAL_READS_WRITES_ANNOTATIONS_ENABLED
+#undef ABSL_INTERNAL_BEGIN_EXTERN_C
+#undef ABSL_INTERNAL_END_EXTERN_C
+#undef ABSL_INTERNAL_STATIC_INLINE
+
+#endif // ABSL_BASE_DYNAMIC_ANNOTATIONS_H_
diff --git a/third_party/abseil/src/absl/base/exception_safety_testing_test.cc b/third_party/abseil/src/absl/base/exception_safety_testing_test.cc
new file mode 100644
index 0000000..a59be29
--- /dev/null
+++ b/third_party/abseil/src/absl/base/exception_safety_testing_test.cc
@@ -0,0 +1,956 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/base/internal/exception_safety_testing.h"
+
+#ifdef ABSL_HAVE_EXCEPTIONS
+
+#include <cstddef>
+#include <exception>
+#include <iostream>
+#include <list>
+#include <type_traits>
+#include <vector>
+
+#include "gtest/gtest-spi.h"
+#include "gtest/gtest.h"
+#include "absl/memory/memory.h"
+
+namespace testing {
+
+namespace {
+
+using ::testing::exceptions_internal::SetCountdown;
+using ::testing::exceptions_internal::TestException;
+using ::testing::exceptions_internal::UnsetCountdown;
+
+// EXPECT_NO_THROW can't inspect the thrown inspection in general.
+template <typename F>
+void ExpectNoThrow(const F& f) {
+ try {
+ f();
+ } catch (const TestException& e) {
+ ADD_FAILURE() << "Unexpected exception thrown from " << e.what();
+ }
+}
+
+TEST(ThrowingValueTest, Throws) {
+ SetCountdown();
+ EXPECT_THROW(ThrowingValue<> bomb, TestException);
+
+ // It's not guaranteed that every operator only throws *once*. The default
+ // ctor only throws once, though, so use it to make sure we only throw when
+ // the countdown hits 0
+ SetCountdown(2);
+ ExpectNoThrow([]() { ThrowingValue<> bomb; });
+ ExpectNoThrow([]() { ThrowingValue<> bomb; });
+ EXPECT_THROW(ThrowingValue<> bomb, TestException);
+
+ UnsetCountdown();
+}
+
+// Tests that an operation throws when the countdown is at 0, doesn't throw when
+// the countdown doesn't hit 0, and doesn't modify the state of the
+// ThrowingValue if it throws
+template <typename F>
+void TestOp(const F& f) {
+ ExpectNoThrow(f);
+
+ SetCountdown();
+ EXPECT_THROW(f(), TestException);
+ UnsetCountdown();
+}
+
+TEST(ThrowingValueTest, ThrowingCtors) {
+ ThrowingValue<> bomb;
+
+ TestOp([]() { ThrowingValue<> bomb(1); });
+ TestOp([&]() { ThrowingValue<> bomb1 = bomb; });
+ TestOp([&]() { ThrowingValue<> bomb1 = std::move(bomb); });
+}
+
+TEST(ThrowingValueTest, ThrowingAssignment) {
+ ThrowingValue<> bomb, bomb1;
+
+ TestOp([&]() { bomb = bomb1; });
+ TestOp([&]() { bomb = std::move(bomb1); });
+
+ // Test that when assignment throws, the assignment should fail (lhs != rhs)
+ // and strong guarantee fails (lhs != lhs_copy).
+ {
+ ThrowingValue<> lhs(39), rhs(42);
+ ThrowingValue<> lhs_copy(lhs);
+ SetCountdown();
+ EXPECT_THROW(lhs = rhs, TestException);
+ UnsetCountdown();
+ EXPECT_NE(lhs, rhs);
+ EXPECT_NE(lhs_copy, lhs);
+ }
+ {
+ ThrowingValue<> lhs(39), rhs(42);
+ ThrowingValue<> lhs_copy(lhs), rhs_copy(rhs);
+ SetCountdown();
+ EXPECT_THROW(lhs = std::move(rhs), TestException);
+ UnsetCountdown();
+ EXPECT_NE(lhs, rhs_copy);
+ EXPECT_NE(lhs_copy, lhs);
+ }
+}
+
+TEST(ThrowingValueTest, ThrowingComparisons) {
+ ThrowingValue<> bomb1, bomb2;
+ TestOp([&]() { return bomb1 == bomb2; });
+ TestOp([&]() { return bomb1 != bomb2; });
+ TestOp([&]() { return bomb1 < bomb2; });
+ TestOp([&]() { return bomb1 <= bomb2; });
+ TestOp([&]() { return bomb1 > bomb2; });
+ TestOp([&]() { return bomb1 >= bomb2; });
+}
+
+TEST(ThrowingValueTest, ThrowingArithmeticOps) {
+ ThrowingValue<> bomb1(1), bomb2(2);
+
+ TestOp([&bomb1]() { +bomb1; });
+ TestOp([&bomb1]() { -bomb1; });
+ TestOp([&bomb1]() { ++bomb1; });
+ TestOp([&bomb1]() { bomb1++; });
+ TestOp([&bomb1]() { --bomb1; });
+ TestOp([&bomb1]() { bomb1--; });
+
+ TestOp([&]() { bomb1 + bomb2; });
+ TestOp([&]() { bomb1 - bomb2; });
+ TestOp([&]() { bomb1* bomb2; });
+ TestOp([&]() { bomb1 / bomb2; });
+ TestOp([&]() { bomb1 << 1; });
+ TestOp([&]() { bomb1 >> 1; });
+}
+
+TEST(ThrowingValueTest, ThrowingLogicalOps) {
+ ThrowingValue<> bomb1, bomb2;
+
+ TestOp([&bomb1]() { !bomb1; });
+ TestOp([&]() { bomb1&& bomb2; });
+ TestOp([&]() { bomb1 || bomb2; });
+}
+
+TEST(ThrowingValueTest, ThrowingBitwiseOps) {
+ ThrowingValue<> bomb1, bomb2;
+
+ TestOp([&bomb1]() { ~bomb1; });
+ TestOp([&]() { bomb1& bomb2; });
+ TestOp([&]() { bomb1 | bomb2; });
+ TestOp([&]() { bomb1 ^ bomb2; });
+}
+
+TEST(ThrowingValueTest, ThrowingCompoundAssignmentOps) {
+ ThrowingValue<> bomb1(1), bomb2(2);
+
+ TestOp([&]() { bomb1 += bomb2; });
+ TestOp([&]() { bomb1 -= bomb2; });
+ TestOp([&]() { bomb1 *= bomb2; });
+ TestOp([&]() { bomb1 /= bomb2; });
+ TestOp([&]() { bomb1 %= bomb2; });
+ TestOp([&]() { bomb1 &= bomb2; });
+ TestOp([&]() { bomb1 |= bomb2; });
+ TestOp([&]() { bomb1 ^= bomb2; });
+ TestOp([&]() { bomb1 *= bomb2; });
+}
+
+TEST(ThrowingValueTest, ThrowingStreamOps) {
+ ThrowingValue<> bomb;
+
+ TestOp([&]() {
+ std::istringstream stream;
+ stream >> bomb;
+ });
+ TestOp([&]() {
+ std::stringstream stream;
+ stream << bomb;
+ });
+}
+
+// Tests the operator<< of ThrowingValue by forcing ConstructorTracker to emit
+// a nonfatal failure that contains the string representation of the Thrower
+TEST(ThrowingValueTest, StreamOpsOutput) {
+ using ::testing::TypeSpec;
+ exceptions_internal::ConstructorTracker ct(exceptions_internal::countdown);
+
+ // Test default spec list (kEverythingThrows)
+ EXPECT_NONFATAL_FAILURE(
+ {
+ using Thrower = ThrowingValue<TypeSpec{}>;
+ auto thrower = Thrower(123);
+ thrower.~Thrower();
+ },
+ "ThrowingValue<>(123)");
+
+ // Test with one item in spec list (kNoThrowCopy)
+ EXPECT_NONFATAL_FAILURE(
+ {
+ using Thrower = ThrowingValue<TypeSpec::kNoThrowCopy>;
+ auto thrower = Thrower(234);
+ thrower.~Thrower();
+ },
+ "ThrowingValue<kNoThrowCopy>(234)");
+
+ // Test with multiple items in spec list (kNoThrowMove, kNoThrowNew)
+ EXPECT_NONFATAL_FAILURE(
+ {
+ using Thrower =
+ ThrowingValue<TypeSpec::kNoThrowMove | TypeSpec::kNoThrowNew>;
+ auto thrower = Thrower(345);
+ thrower.~Thrower();
+ },
+ "ThrowingValue<kNoThrowMove | kNoThrowNew>(345)");
+
+ // Test with all items in spec list (kNoThrowCopy, kNoThrowMove, kNoThrowNew)
+ EXPECT_NONFATAL_FAILURE(
+ {
+ using Thrower = ThrowingValue<static_cast<TypeSpec>(-1)>;
+ auto thrower = Thrower(456);
+ thrower.~Thrower();
+ },
+ "ThrowingValue<kNoThrowCopy | kNoThrowMove | kNoThrowNew>(456)");
+}
+
+template <typename F>
+void TestAllocatingOp(const F& f) {
+ ExpectNoThrow(f);
+
+ SetCountdown();
+ EXPECT_THROW(f(), exceptions_internal::TestBadAllocException);
+ UnsetCountdown();
+}
+
+TEST(ThrowingValueTest, ThrowingAllocatingOps) {
+ // make_unique calls unqualified operator new, so these exercise the
+ // ThrowingValue overloads.
+ TestAllocatingOp([]() { return absl::make_unique<ThrowingValue<>>(1); });
+ TestAllocatingOp([]() { return absl::make_unique<ThrowingValue<>[]>(2); });
+}
+
+TEST(ThrowingValueTest, NonThrowingMoveCtor) {
+ ThrowingValue<TypeSpec::kNoThrowMove> nothrow_ctor;
+
+ SetCountdown();
+ ExpectNoThrow([¬hrow_ctor]() {
+ ThrowingValue<TypeSpec::kNoThrowMove> nothrow1 = std::move(nothrow_ctor);
+ });
+ UnsetCountdown();
+}
+
+TEST(ThrowingValueTest, NonThrowingMoveAssign) {
+ ThrowingValue<TypeSpec::kNoThrowMove> nothrow_assign1, nothrow_assign2;
+
+ SetCountdown();
+ ExpectNoThrow([¬hrow_assign1, ¬hrow_assign2]() {
+ nothrow_assign1 = std::move(nothrow_assign2);
+ });
+ UnsetCountdown();
+}
+
+TEST(ThrowingValueTest, ThrowingCopyCtor) {
+ ThrowingValue<> tv;
+
+ TestOp([&]() { ThrowingValue<> tv_copy(tv); });
+}
+
+TEST(ThrowingValueTest, ThrowingCopyAssign) {
+ ThrowingValue<> tv1, tv2;
+
+ TestOp([&]() { tv1 = tv2; });
+}
+
+TEST(ThrowingValueTest, NonThrowingCopyCtor) {
+ ThrowingValue<TypeSpec::kNoThrowCopy> nothrow_ctor;
+
+ SetCountdown();
+ ExpectNoThrow([¬hrow_ctor]() {
+ ThrowingValue<TypeSpec::kNoThrowCopy> nothrow1(nothrow_ctor);
+ });
+ UnsetCountdown();
+}
+
+TEST(ThrowingValueTest, NonThrowingCopyAssign) {
+ ThrowingValue<TypeSpec::kNoThrowCopy> nothrow_assign1, nothrow_assign2;
+
+ SetCountdown();
+ ExpectNoThrow([¬hrow_assign1, ¬hrow_assign2]() {
+ nothrow_assign1 = nothrow_assign2;
+ });
+ UnsetCountdown();
+}
+
+TEST(ThrowingValueTest, ThrowingSwap) {
+ ThrowingValue<> bomb1, bomb2;
+ TestOp([&]() { std::swap(bomb1, bomb2); });
+}
+
+TEST(ThrowingValueTest, NonThrowingSwap) {
+ ThrowingValue<TypeSpec::kNoThrowMove> bomb1, bomb2;
+ ExpectNoThrow([&]() { std::swap(bomb1, bomb2); });
+}
+
+TEST(ThrowingValueTest, NonThrowingAllocation) {
+ ThrowingValue<TypeSpec::kNoThrowNew>* allocated;
+ ThrowingValue<TypeSpec::kNoThrowNew>* array;
+
+ ExpectNoThrow([&allocated]() {
+ allocated = new ThrowingValue<TypeSpec::kNoThrowNew>(1);
+ delete allocated;
+ });
+ ExpectNoThrow([&array]() {
+ array = new ThrowingValue<TypeSpec::kNoThrowNew>[2];
+ delete[] array;
+ });
+}
+
+TEST(ThrowingValueTest, NonThrowingDelete) {
+ auto* allocated = new ThrowingValue<>(1);
+ auto* array = new ThrowingValue<>[2];
+
+ SetCountdown();
+ ExpectNoThrow([allocated]() { delete allocated; });
+ SetCountdown();
+ ExpectNoThrow([array]() { delete[] array; });
+
+ UnsetCountdown();
+}
+
+TEST(ThrowingValueTest, NonThrowingPlacementDelete) {
+ constexpr int kArrayLen = 2;
+ // We intentionally create extra space to store the tag allocated by placement
+ // new[].
+ constexpr int kStorageLen = 4;
+
+ alignas(ThrowingValue<>) unsigned char buf[sizeof(ThrowingValue<>)];
+ alignas(ThrowingValue<>) unsigned char
+ array_buf[sizeof(ThrowingValue<>[kStorageLen])];
+ auto* placed = new (&buf) ThrowingValue<>(1);
+ auto placed_array = new (&array_buf) ThrowingValue<>[kArrayLen];
+
+ SetCountdown();
+ ExpectNoThrow([placed, &buf]() {
+ placed->~ThrowingValue<>();
+ ThrowingValue<>::operator delete(placed, &buf);
+ });
+
+ SetCountdown();
+ ExpectNoThrow([&, placed_array]() {
+ for (int i = 0; i < kArrayLen; ++i) placed_array[i].~ThrowingValue<>();
+ ThrowingValue<>::operator delete[](placed_array, &array_buf);
+ });
+
+ UnsetCountdown();
+}
+
+TEST(ThrowingValueTest, NonThrowingDestructor) {
+ auto* allocated = new ThrowingValue<>();
+
+ SetCountdown();
+ ExpectNoThrow([allocated]() { delete allocated; });
+ UnsetCountdown();
+}
+
+TEST(ThrowingBoolTest, ThrowingBool) {
+ ThrowingBool t = true;
+
+ // Test that it's contextually convertible to bool
+ if (t) { // NOLINT(whitespace/empty_if_body)
+ }
+ EXPECT_TRUE(t);
+
+ TestOp([&]() { (void)!t; });
+}
+
+TEST(ThrowingAllocatorTest, MemoryManagement) {
+ // Just exercise the memory management capabilities under LSan to make sure we
+ // don't leak.
+ ThrowingAllocator<int> int_alloc;
+ int* ip = int_alloc.allocate(1);
+ int_alloc.deallocate(ip, 1);
+ int* i_array = int_alloc.allocate(2);
+ int_alloc.deallocate(i_array, 2);
+
+ ThrowingAllocator<ThrowingValue<>> tv_alloc;
+ ThrowingValue<>* ptr = tv_alloc.allocate(1);
+ tv_alloc.deallocate(ptr, 1);
+ ThrowingValue<>* tv_array = tv_alloc.allocate(2);
+ tv_alloc.deallocate(tv_array, 2);
+}
+
+TEST(ThrowingAllocatorTest, CallsGlobalNew) {
+ ThrowingAllocator<ThrowingValue<>, AllocSpec::kNoThrowAllocate> nothrow_alloc;
+ ThrowingValue<>* ptr;
+
+ SetCountdown();
+ // This will only throw if ThrowingValue::new is called.
+ ExpectNoThrow([&]() { ptr = nothrow_alloc.allocate(1); });
+ nothrow_alloc.deallocate(ptr, 1);
+
+ UnsetCountdown();
+}
+
+TEST(ThrowingAllocatorTest, ThrowingConstructors) {
+ ThrowingAllocator<int> int_alloc;
+ int* ip = nullptr;
+
+ SetCountdown();
+ EXPECT_THROW(ip = int_alloc.allocate(1), TestException);
+ ExpectNoThrow([&]() { ip = int_alloc.allocate(1); });
+
+ *ip = 1;
+ SetCountdown();
+ EXPECT_THROW(int_alloc.construct(ip, 2), TestException);
+ EXPECT_EQ(*ip, 1);
+ int_alloc.deallocate(ip, 1);
+
+ UnsetCountdown();
+}
+
+TEST(ThrowingAllocatorTest, NonThrowingConstruction) {
+ {
+ ThrowingAllocator<int, AllocSpec::kNoThrowAllocate> int_alloc;
+ int* ip = nullptr;
+
+ SetCountdown();
+ ExpectNoThrow([&]() { ip = int_alloc.allocate(1); });
+
+ SetCountdown();
+ ExpectNoThrow([&]() { int_alloc.construct(ip, 2); });
+
+ EXPECT_EQ(*ip, 2);
+ int_alloc.deallocate(ip, 1);
+
+ UnsetCountdown();
+ }
+
+ {
+ ThrowingAllocator<int> int_alloc;
+ int* ip = nullptr;
+ ExpectNoThrow([&]() { ip = int_alloc.allocate(1); });
+ ExpectNoThrow([&]() { int_alloc.construct(ip, 2); });
+ EXPECT_EQ(*ip, 2);
+ int_alloc.deallocate(ip, 1);
+ }
+
+ {
+ ThrowingAllocator<ThrowingValue<>, AllocSpec::kNoThrowAllocate>
+ nothrow_alloc;
+ ThrowingValue<>* ptr;
+
+ SetCountdown();
+ ExpectNoThrow([&]() { ptr = nothrow_alloc.allocate(1); });
+
+ SetCountdown();
+ ExpectNoThrow(
+ [&]() { nothrow_alloc.construct(ptr, 2, testing::nothrow_ctor); });
+
+ EXPECT_EQ(ptr->Get(), 2);
+ nothrow_alloc.destroy(ptr);
+ nothrow_alloc.deallocate(ptr, 1);
+
+ UnsetCountdown();
+ }
+
+ {
+ ThrowingAllocator<int> a;
+
+ SetCountdown();
+ ExpectNoThrow([&]() { ThrowingAllocator<double> a1 = a; });
+
+ SetCountdown();
+ ExpectNoThrow([&]() { ThrowingAllocator<double> a1 = std::move(a); });
+
+ UnsetCountdown();
+ }
+}
+
+TEST(ThrowingAllocatorTest, ThrowingAllocatorConstruction) {
+ ThrowingAllocator<int> a;
+ TestOp([]() { ThrowingAllocator<int> a; });
+ TestOp([&]() { a.select_on_container_copy_construction(); });
+}
+
+TEST(ThrowingAllocatorTest, State) {
+ ThrowingAllocator<int> a1, a2;
+ EXPECT_NE(a1, a2);
+
+ auto a3 = a1;
+ EXPECT_EQ(a3, a1);
+ int* ip = a1.allocate(1);
+ EXPECT_EQ(a3, a1);
+ a3.deallocate(ip, 1);
+ EXPECT_EQ(a3, a1);
+}
+
+TEST(ThrowingAllocatorTest, InVector) {
+ std::vector<ThrowingValue<>, ThrowingAllocator<ThrowingValue<>>> v;
+ for (int i = 0; i < 20; ++i) v.push_back({});
+ for (int i = 0; i < 20; ++i) v.pop_back();
+}
+
+TEST(ThrowingAllocatorTest, InList) {
+ std::list<ThrowingValue<>, ThrowingAllocator<ThrowingValue<>>> l;
+ for (int i = 0; i < 20; ++i) l.push_back({});
+ for (int i = 0; i < 20; ++i) l.pop_back();
+ for (int i = 0; i < 20; ++i) l.push_front({});
+ for (int i = 0; i < 20; ++i) l.pop_front();
+}
+
+template <typename TesterInstance, typename = void>
+struct NullaryTestValidator : public std::false_type {};
+
+template <typename TesterInstance>
+struct NullaryTestValidator<
+ TesterInstance,
+ absl::void_t<decltype(std::declval<TesterInstance>().Test())>>
+ : public std::true_type {};
+
+template <typename TesterInstance>
+bool HasNullaryTest(const TesterInstance&) {
+ return NullaryTestValidator<TesterInstance>::value;
+}
+
+void DummyOp(void*) {}
+
+template <typename TesterInstance, typename = void>
+struct UnaryTestValidator : public std::false_type {};
+
+template <typename TesterInstance>
+struct UnaryTestValidator<
+ TesterInstance,
+ absl::void_t<decltype(std::declval<TesterInstance>().Test(DummyOp))>>
+ : public std::true_type {};
+
+template <typename TesterInstance>
+bool HasUnaryTest(const TesterInstance&) {
+ return UnaryTestValidator<TesterInstance>::value;
+}
+
+TEST(ExceptionSafetyTesterTest, IncompleteTypesAreNotTestable) {
+ using T = exceptions_internal::UninitializedT;
+ auto op = [](T* t) {};
+ auto inv = [](T*) { return testing::AssertionSuccess(); };
+ auto fac = []() { return absl::make_unique<T>(); };
+
+ // Test that providing operation and inveriants still does not allow for the
+ // the invocation of .Test() and .Test(op) because it lacks a factory
+ auto without_fac =
+ testing::MakeExceptionSafetyTester().WithOperation(op).WithContracts(
+ inv, testing::strong_guarantee);
+ EXPECT_FALSE(HasNullaryTest(without_fac));
+ EXPECT_FALSE(HasUnaryTest(without_fac));
+
+ // Test that providing contracts and factory allows the invocation of
+ // .Test(op) but does not allow for .Test() because it lacks an operation
+ auto without_op = testing::MakeExceptionSafetyTester()
+ .WithContracts(inv, testing::strong_guarantee)
+ .WithFactory(fac);
+ EXPECT_FALSE(HasNullaryTest(without_op));
+ EXPECT_TRUE(HasUnaryTest(without_op));
+
+ // Test that providing operation and factory still does not allow for the
+ // the invocation of .Test() and .Test(op) because it lacks contracts
+ auto without_inv =
+ testing::MakeExceptionSafetyTester().WithOperation(op).WithFactory(fac);
+ EXPECT_FALSE(HasNullaryTest(without_inv));
+ EXPECT_FALSE(HasUnaryTest(without_inv));
+}
+
+struct ExampleStruct {};
+
+std::unique_ptr<ExampleStruct> ExampleFunctionFactory() {
+ return absl::make_unique<ExampleStruct>();
+}
+
+void ExampleFunctionOperation(ExampleStruct*) {}
+
+testing::AssertionResult ExampleFunctionContract(ExampleStruct*) {
+ return testing::AssertionSuccess();
+}
+
+struct {
+ std::unique_ptr<ExampleStruct> operator()() const {
+ return ExampleFunctionFactory();
+ }
+} example_struct_factory;
+
+struct {
+ void operator()(ExampleStruct*) const {}
+} example_struct_operation;
+
+struct {
+ testing::AssertionResult operator()(ExampleStruct* example_struct) const {
+ return ExampleFunctionContract(example_struct);
+ }
+} example_struct_contract;
+
+auto example_lambda_factory = []() { return ExampleFunctionFactory(); };
+
+auto example_lambda_operation = [](ExampleStruct*) {};
+
+auto example_lambda_contract = [](ExampleStruct* example_struct) {
+ return ExampleFunctionContract(example_struct);
+};
+
+// Testing that function references, pointers, structs with operator() and
+// lambdas can all be used with ExceptionSafetyTester
+TEST(ExceptionSafetyTesterTest, MixedFunctionTypes) {
+ // function reference
+ EXPECT_TRUE(testing::MakeExceptionSafetyTester()
+ .WithFactory(ExampleFunctionFactory)
+ .WithOperation(ExampleFunctionOperation)
+ .WithContracts(ExampleFunctionContract)
+ .Test());
+
+ // function pointer
+ EXPECT_TRUE(testing::MakeExceptionSafetyTester()
+ .WithFactory(&ExampleFunctionFactory)
+ .WithOperation(&ExampleFunctionOperation)
+ .WithContracts(&ExampleFunctionContract)
+ .Test());
+
+ // struct
+ EXPECT_TRUE(testing::MakeExceptionSafetyTester()
+ .WithFactory(example_struct_factory)
+ .WithOperation(example_struct_operation)
+ .WithContracts(example_struct_contract)
+ .Test());
+
+ // lambda
+ EXPECT_TRUE(testing::MakeExceptionSafetyTester()
+ .WithFactory(example_lambda_factory)
+ .WithOperation(example_lambda_operation)
+ .WithContracts(example_lambda_contract)
+ .Test());
+}
+
+struct NonNegative {
+ bool operator==(const NonNegative& other) const { return i == other.i; }
+ int i;
+};
+
+testing::AssertionResult CheckNonNegativeInvariants(NonNegative* g) {
+ if (g->i >= 0) {
+ return testing::AssertionSuccess();
+ }
+ return testing::AssertionFailure()
+ << "i should be non-negative but is " << g->i;
+}
+
+struct {
+ template <typename T>
+ void operator()(T* t) const {
+ (*t)();
+ }
+} invoker;
+
+auto tester =
+ testing::MakeExceptionSafetyTester().WithOperation(invoker).WithContracts(
+ CheckNonNegativeInvariants);
+auto strong_tester = tester.WithContracts(testing::strong_guarantee);
+
+struct FailsBasicGuarantee : public NonNegative {
+ void operator()() {
+ --i;
+ ThrowingValue<> bomb;
+ ++i;
+ }
+};
+
+TEST(ExceptionCheckTest, BasicGuaranteeFailure) {
+ EXPECT_FALSE(tester.WithInitialValue(FailsBasicGuarantee{}).Test());
+}
+
+struct FollowsBasicGuarantee : public NonNegative {
+ void operator()() {
+ ++i;
+ ThrowingValue<> bomb;
+ }
+};
+
+TEST(ExceptionCheckTest, BasicGuarantee) {
+ EXPECT_TRUE(tester.WithInitialValue(FollowsBasicGuarantee{}).Test());
+}
+
+TEST(ExceptionCheckTest, StrongGuaranteeFailure) {
+ EXPECT_FALSE(strong_tester.WithInitialValue(FailsBasicGuarantee{}).Test());
+ EXPECT_FALSE(strong_tester.WithInitialValue(FollowsBasicGuarantee{}).Test());
+}
+
+struct BasicGuaranteeWithExtraContracts : public NonNegative {
+ // After operator(), i is incremented. If operator() throws, i is set to 9999
+ void operator()() {
+ int old_i = i;
+ i = kExceptionSentinel;
+ ThrowingValue<> bomb;
+ i = ++old_i;
+ }
+
+ static constexpr int kExceptionSentinel = 9999;
+};
+constexpr int BasicGuaranteeWithExtraContracts::kExceptionSentinel;
+
+TEST(ExceptionCheckTest, BasicGuaranteeWithExtraContracts) {
+ auto tester_with_val =
+ tester.WithInitialValue(BasicGuaranteeWithExtraContracts{});
+ EXPECT_TRUE(tester_with_val.Test());
+ EXPECT_TRUE(
+ tester_with_val
+ .WithContracts([](BasicGuaranteeWithExtraContracts* o) {
+ if (o->i == BasicGuaranteeWithExtraContracts::kExceptionSentinel) {
+ return testing::AssertionSuccess();
+ }
+ return testing::AssertionFailure()
+ << "i should be "
+ << BasicGuaranteeWithExtraContracts::kExceptionSentinel
+ << ", but is " << o->i;
+ })
+ .Test());
+}
+
+struct FollowsStrongGuarantee : public NonNegative {
+ void operator()() { ThrowingValue<> bomb; }
+};
+
+TEST(ExceptionCheckTest, StrongGuarantee) {
+ EXPECT_TRUE(tester.WithInitialValue(FollowsStrongGuarantee{}).Test());
+ EXPECT_TRUE(strong_tester.WithInitialValue(FollowsStrongGuarantee{}).Test());
+}
+
+struct HasReset : public NonNegative {
+ void operator()() {
+ i = -1;
+ ThrowingValue<> bomb;
+ i = 1;
+ }
+
+ void reset() { i = 0; }
+};
+
+testing::AssertionResult CheckHasResetContracts(HasReset* h) {
+ h->reset();
+ return testing::AssertionResult(h->i == 0);
+}
+
+TEST(ExceptionCheckTest, ModifyingChecker) {
+ auto set_to_1000 = [](FollowsBasicGuarantee* g) {
+ g->i = 1000;
+ return testing::AssertionSuccess();
+ };
+ auto is_1000 = [](FollowsBasicGuarantee* g) {
+ return testing::AssertionResult(g->i == 1000);
+ };
+ auto increment = [](FollowsStrongGuarantee* g) {
+ ++g->i;
+ return testing::AssertionSuccess();
+ };
+
+ EXPECT_FALSE(tester.WithInitialValue(FollowsBasicGuarantee{})
+ .WithContracts(set_to_1000, is_1000)
+ .Test());
+ EXPECT_TRUE(strong_tester.WithInitialValue(FollowsStrongGuarantee{})
+ .WithContracts(increment)
+ .Test());
+ EXPECT_TRUE(testing::MakeExceptionSafetyTester()
+ .WithInitialValue(HasReset{})
+ .WithContracts(CheckHasResetContracts)
+ .Test(invoker));
+}
+
+TEST(ExceptionSafetyTesterTest, ResetsCountdown) {
+ auto test =
+ testing::MakeExceptionSafetyTester()
+ .WithInitialValue(ThrowingValue<>())
+ .WithContracts([](ThrowingValue<>*) { return AssertionSuccess(); })
+ .WithOperation([](ThrowingValue<>*) {});
+ ASSERT_TRUE(test.Test());
+ // If the countdown isn't reset because there were no exceptions thrown, then
+ // this will fail with a termination from an unhandled exception
+ EXPECT_TRUE(test.Test());
+}
+
+struct NonCopyable : public NonNegative {
+ NonCopyable(const NonCopyable&) = delete;
+ NonCopyable() : NonNegative{0} {}
+
+ void operator()() { ThrowingValue<> bomb; }
+};
+
+TEST(ExceptionCheckTest, NonCopyable) {
+ auto factory = []() { return absl::make_unique<NonCopyable>(); };
+ EXPECT_TRUE(tester.WithFactory(factory).Test());
+ EXPECT_TRUE(strong_tester.WithFactory(factory).Test());
+}
+
+struct NonEqualityComparable : public NonNegative {
+ void operator()() { ThrowingValue<> bomb; }
+
+ void ModifyOnThrow() {
+ ++i;
+ ThrowingValue<> bomb;
+ static_cast<void>(bomb);
+ --i;
+ }
+};
+
+TEST(ExceptionCheckTest, NonEqualityComparable) {
+ auto nec_is_strong = [](NonEqualityComparable* nec) {
+ return testing::AssertionResult(nec->i == NonEqualityComparable().i);
+ };
+ auto strong_nec_tester = tester.WithInitialValue(NonEqualityComparable{})
+ .WithContracts(nec_is_strong);
+
+ EXPECT_TRUE(strong_nec_tester.Test());
+ EXPECT_FALSE(strong_nec_tester.Test(
+ [](NonEqualityComparable* n) { n->ModifyOnThrow(); }));
+}
+
+template <typename T>
+struct ExhaustivenessTester {
+ void operator()() {
+ successes |= 1;
+ T b1;
+ static_cast<void>(b1);
+ successes |= (1 << 1);
+ T b2;
+ static_cast<void>(b2);
+ successes |= (1 << 2);
+ T b3;
+ static_cast<void>(b3);
+ successes |= (1 << 3);
+ }
+
+ bool operator==(const ExhaustivenessTester<ThrowingValue<>>&) const {
+ return true;
+ }
+
+ static unsigned char successes;
+};
+
+struct {
+ template <typename T>
+ testing::AssertionResult operator()(ExhaustivenessTester<T>*) const {
+ return testing::AssertionSuccess();
+ }
+} CheckExhaustivenessTesterContracts;
+
+template <typename T>
+unsigned char ExhaustivenessTester<T>::successes = 0;
+
+TEST(ExceptionCheckTest, Exhaustiveness) {
+ auto exhaust_tester = testing::MakeExceptionSafetyTester()
+ .WithContracts(CheckExhaustivenessTesterContracts)
+ .WithOperation(invoker);
+
+ EXPECT_TRUE(
+ exhaust_tester.WithInitialValue(ExhaustivenessTester<int>{}).Test());
+ EXPECT_EQ(ExhaustivenessTester<int>::successes, 0xF);
+
+ EXPECT_TRUE(
+ exhaust_tester.WithInitialValue(ExhaustivenessTester<ThrowingValue<>>{})
+ .WithContracts(testing::strong_guarantee)
+ .Test());
+ EXPECT_EQ(ExhaustivenessTester<ThrowingValue<>>::successes, 0xF);
+}
+
+struct LeaksIfCtorThrows : private exceptions_internal::TrackedObject {
+ LeaksIfCtorThrows() : TrackedObject(ABSL_PRETTY_FUNCTION) {
+ ++counter;
+ ThrowingValue<> v;
+ static_cast<void>(v);
+ --counter;
+ }
+ LeaksIfCtorThrows(const LeaksIfCtorThrows&) noexcept
+ : TrackedObject(ABSL_PRETTY_FUNCTION) {}
+ static int counter;
+};
+int LeaksIfCtorThrows::counter = 0;
+
+TEST(ExceptionCheckTest, TestLeakyCtor) {
+ testing::TestThrowingCtor<LeaksIfCtorThrows>();
+ EXPECT_EQ(LeaksIfCtorThrows::counter, 1);
+ LeaksIfCtorThrows::counter = 0;
+}
+
+struct Tracked : private exceptions_internal::TrackedObject {
+ Tracked() : TrackedObject(ABSL_PRETTY_FUNCTION) {}
+};
+
+TEST(ConstructorTrackerTest, CreatedBefore) {
+ Tracked a, b, c;
+ exceptions_internal::ConstructorTracker ct(exceptions_internal::countdown);
+}
+
+TEST(ConstructorTrackerTest, CreatedAfter) {
+ exceptions_internal::ConstructorTracker ct(exceptions_internal::countdown);
+ Tracked a, b, c;
+}
+
+TEST(ConstructorTrackerTest, NotDestroyedAfter) {
+ alignas(Tracked) unsigned char storage[sizeof(Tracked)];
+ EXPECT_NONFATAL_FAILURE(
+ {
+ exceptions_internal::ConstructorTracker ct(
+ exceptions_internal::countdown);
+ new (&storage) Tracked();
+ },
+ "not destroyed");
+}
+
+TEST(ConstructorTrackerTest, DestroyedTwice) {
+ exceptions_internal::ConstructorTracker ct(exceptions_internal::countdown);
+ EXPECT_NONFATAL_FAILURE(
+ {
+ Tracked t;
+ t.~Tracked();
+ },
+ "re-destroyed");
+}
+
+TEST(ConstructorTrackerTest, ConstructedTwice) {
+ exceptions_internal::ConstructorTracker ct(exceptions_internal::countdown);
+ alignas(Tracked) unsigned char storage[sizeof(Tracked)];
+ EXPECT_NONFATAL_FAILURE(
+ {
+ new (&storage) Tracked();
+ new (&storage) Tracked();
+ reinterpret_cast<Tracked*>(&storage)->~Tracked();
+ },
+ "re-constructed");
+}
+
+TEST(ThrowingValueTraitsTest, RelationalOperators) {
+ ThrowingValue<> a, b;
+ EXPECT_TRUE((std::is_convertible<decltype(a == b), bool>::value));
+ EXPECT_TRUE((std::is_convertible<decltype(a != b), bool>::value));
+ EXPECT_TRUE((std::is_convertible<decltype(a < b), bool>::value));
+ EXPECT_TRUE((std::is_convertible<decltype(a <= b), bool>::value));
+ EXPECT_TRUE((std::is_convertible<decltype(a > b), bool>::value));
+ EXPECT_TRUE((std::is_convertible<decltype(a >= b), bool>::value));
+}
+
+TEST(ThrowingAllocatorTraitsTest, Assignablility) {
+ EXPECT_TRUE(absl::is_move_assignable<ThrowingAllocator<int>>::value);
+ EXPECT_TRUE(absl::is_copy_assignable<ThrowingAllocator<int>>::value);
+ EXPECT_TRUE(std::is_nothrow_move_assignable<ThrowingAllocator<int>>::value);
+ EXPECT_TRUE(std::is_nothrow_copy_assignable<ThrowingAllocator<int>>::value);
+}
+
+} // namespace
+
+} // namespace testing
+
+#endif // ABSL_HAVE_EXCEPTIONS
diff --git a/third_party/abseil/src/absl/base/inline_variable_test.cc b/third_party/abseil/src/absl/base/inline_variable_test.cc
new file mode 100644
index 0000000..37a40e1
--- /dev/null
+++ b/third_party/abseil/src/absl/base/inline_variable_test.cc
@@ -0,0 +1,64 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <type_traits>
+
+#include "absl/base/internal/inline_variable.h"
+#include "absl/base/internal/inline_variable_testing.h"
+
+#include "gtest/gtest.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace inline_variable_testing_internal {
+namespace {
+
+TEST(InlineVariableTest, Constexpr) {
+ static_assert(inline_variable_foo.value == 5, "");
+ static_assert(other_inline_variable_foo.value == 5, "");
+ static_assert(inline_variable_int == 5, "");
+ static_assert(other_inline_variable_int == 5, "");
+}
+
+TEST(InlineVariableTest, DefaultConstructedIdentityEquality) {
+ EXPECT_EQ(get_foo_a().value, 5);
+ EXPECT_EQ(get_foo_b().value, 5);
+ EXPECT_EQ(&get_foo_a(), &get_foo_b());
+}
+
+TEST(InlineVariableTest, DefaultConstructedIdentityInequality) {
+ EXPECT_NE(&inline_variable_foo, &other_inline_variable_foo);
+}
+
+TEST(InlineVariableTest, InitializedIdentityEquality) {
+ EXPECT_EQ(get_int_a(), 5);
+ EXPECT_EQ(get_int_b(), 5);
+ EXPECT_EQ(&get_int_a(), &get_int_b());
+}
+
+TEST(InlineVariableTest, InitializedIdentityInequality) {
+ EXPECT_NE(&inline_variable_int, &other_inline_variable_int);
+}
+
+TEST(InlineVariableTest, FunPtrType) {
+ static_assert(
+ std::is_same<void(*)(),
+ std::decay<decltype(inline_variable_fun_ptr)>::type>::value,
+ "");
+}
+
+} // namespace
+} // namespace inline_variable_testing_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/base/inline_variable_test_a.cc b/third_party/abseil/src/absl/base/inline_variable_test_a.cc
new file mode 100644
index 0000000..f96a58d
--- /dev/null
+++ b/third_party/abseil/src/absl/base/inline_variable_test_a.cc
@@ -0,0 +1,27 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/base/internal/inline_variable_testing.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace inline_variable_testing_internal {
+
+const Foo& get_foo_a() { return inline_variable_foo; }
+
+const int& get_int_a() { return inline_variable_int; }
+
+} // namespace inline_variable_testing_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/base/inline_variable_test_b.cc b/third_party/abseil/src/absl/base/inline_variable_test_b.cc
new file mode 100644
index 0000000..038adc3
--- /dev/null
+++ b/third_party/abseil/src/absl/base/inline_variable_test_b.cc
@@ -0,0 +1,27 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/base/internal/inline_variable_testing.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace inline_variable_testing_internal {
+
+const Foo& get_foo_b() { return inline_variable_foo; }
+
+const int& get_int_b() { return inline_variable_int; }
+
+} // namespace inline_variable_testing_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/base/internal/atomic_hook.h b/third_party/abseil/src/absl/base/internal/atomic_hook.h
new file mode 100644
index 0000000..ae21cd7
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/atomic_hook.h
@@ -0,0 +1,200 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_BASE_INTERNAL_ATOMIC_HOOK_H_
+#define ABSL_BASE_INTERNAL_ATOMIC_HOOK_H_
+
+#include <atomic>
+#include <cassert>
+#include <cstdint>
+#include <utility>
+
+#include "absl/base/attributes.h"
+#include "absl/base/config.h"
+
+#if defined(_MSC_VER) && !defined(__clang__)
+#define ABSL_HAVE_WORKING_CONSTEXPR_STATIC_INIT 0
+#else
+#define ABSL_HAVE_WORKING_CONSTEXPR_STATIC_INIT 1
+#endif
+
+#if defined(_MSC_VER)
+#define ABSL_HAVE_WORKING_ATOMIC_POINTER 0
+#else
+#define ABSL_HAVE_WORKING_ATOMIC_POINTER 1
+#endif
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace base_internal {
+
+template <typename T>
+class AtomicHook;
+
+// To workaround AtomicHook not being constant-initializable on some platforms,
+// prefer to annotate instances with `ABSL_INTERNAL_ATOMIC_HOOK_ATTRIBUTES`
+// instead of `ABSL_CONST_INIT`.
+#if ABSL_HAVE_WORKING_CONSTEXPR_STATIC_INIT
+#define ABSL_INTERNAL_ATOMIC_HOOK_ATTRIBUTES ABSL_CONST_INIT
+#else
+#define ABSL_INTERNAL_ATOMIC_HOOK_ATTRIBUTES
+#endif
+
+// `AtomicHook` is a helper class, templatized on a raw function pointer type,
+// for implementing Abseil customization hooks. It is a callable object that
+// dispatches to the registered hook. Objects of type `AtomicHook` must have
+// static or thread storage duration.
+//
+// A default constructed object performs a no-op (and returns a default
+// constructed object) if no hook has been registered.
+//
+// Hooks can be pre-registered via constant initialization, for example:
+//
+// ABSL_INTERNAL_ATOMIC_HOOK_ATTRIBUTES static AtomicHook<void(*)()>
+// my_hook(DefaultAction);
+//
+// and then changed at runtime via a call to `Store()`.
+//
+// Reads and writes guarantee memory_order_acquire/memory_order_release
+// semantics.
+template <typename ReturnType, typename... Args>
+class AtomicHook<ReturnType (*)(Args...)> {
+ public:
+ using FnPtr = ReturnType (*)(Args...);
+
+ // Constructs an object that by default performs a no-op (and
+ // returns a default constructed object) when no hook as been registered.
+ constexpr AtomicHook() : AtomicHook(DummyFunction) {}
+
+ // Constructs an object that by default dispatches to/returns the
+ // pre-registered default_fn when no hook has been registered at runtime.
+#if ABSL_HAVE_WORKING_ATOMIC_POINTER && ABSL_HAVE_WORKING_CONSTEXPR_STATIC_INIT
+ explicit constexpr AtomicHook(FnPtr default_fn)
+ : hook_(default_fn), default_fn_(default_fn) {}
+#elif ABSL_HAVE_WORKING_CONSTEXPR_STATIC_INIT
+ explicit constexpr AtomicHook(FnPtr default_fn)
+ : hook_(kUninitialized), default_fn_(default_fn) {}
+#else
+ // As of January 2020, on all known versions of MSVC this constructor runs in
+ // the global constructor sequence. If `Store()` is called by a dynamic
+ // initializer, we want to preserve the value, even if this constructor runs
+ // after the call to `Store()`. If not, `hook_` will be
+ // zero-initialized by the linker and we have no need to set it.
+ // https://developercommunity.visualstudio.com/content/problem/336946/class-with-constexpr-constructor-not-using-static.html
+ explicit constexpr AtomicHook(FnPtr default_fn)
+ : /* hook_(deliberately omitted), */ default_fn_(default_fn) {
+ static_assert(kUninitialized == 0, "here we rely on zero-initialization");
+ }
+#endif
+
+ // Stores the provided function pointer as the value for this hook.
+ //
+ // This is intended to be called once. Multiple calls are legal only if the
+ // same function pointer is provided for each call. The store is implemented
+ // as a memory_order_release operation, and read accesses are implemented as
+ // memory_order_acquire.
+ void Store(FnPtr fn) {
+ bool success = DoStore(fn);
+ static_cast<void>(success);
+ assert(success);
+ }
+
+ // Invokes the registered callback. If no callback has yet been registered, a
+ // default-constructed object of the appropriate type is returned instead.
+ template <typename... CallArgs>
+ ReturnType operator()(CallArgs&&... args) const {
+ return DoLoad()(std::forward<CallArgs>(args)...);
+ }
+
+ // Returns the registered callback, or nullptr if none has been registered.
+ // Useful if client code needs to conditionalize behavior based on whether a
+ // callback was registered.
+ //
+ // Note that atomic_hook.Load()() and atomic_hook() have different semantics:
+ // operator()() will perform a no-op if no callback was registered, while
+ // Load()() will dereference a null function pointer. Prefer operator()() to
+ // Load()() unless you must conditionalize behavior on whether a hook was
+ // registered.
+ FnPtr Load() const {
+ FnPtr ptr = DoLoad();
+ return (ptr == DummyFunction) ? nullptr : ptr;
+ }
+
+ private:
+ static ReturnType DummyFunction(Args...) {
+ return ReturnType();
+ }
+
+ // Current versions of MSVC (as of September 2017) have a broken
+ // implementation of std::atomic<T*>: Its constructor attempts to do the
+ // equivalent of a reinterpret_cast in a constexpr context, which is not
+ // allowed.
+ //
+ // This causes an issue when building with LLVM under Windows. To avoid this,
+ // we use a less-efficient, intptr_t-based implementation on Windows.
+#if ABSL_HAVE_WORKING_ATOMIC_POINTER
+ // Return the stored value, or DummyFunction if no value has been stored.
+ FnPtr DoLoad() const { return hook_.load(std::memory_order_acquire); }
+
+ // Store the given value. Returns false if a different value was already
+ // stored to this object.
+ bool DoStore(FnPtr fn) {
+ assert(fn);
+ FnPtr expected = default_fn_;
+ const bool store_succeeded = hook_.compare_exchange_strong(
+ expected, fn, std::memory_order_acq_rel, std::memory_order_acquire);
+ const bool same_value_already_stored = (expected == fn);
+ return store_succeeded || same_value_already_stored;
+ }
+
+ std::atomic<FnPtr> hook_;
+#else // !ABSL_HAVE_WORKING_ATOMIC_POINTER
+ // Use a sentinel value unlikely to be the address of an actual function.
+ static constexpr intptr_t kUninitialized = 0;
+
+ static_assert(sizeof(intptr_t) >= sizeof(FnPtr),
+ "intptr_t can't contain a function pointer");
+
+ FnPtr DoLoad() const {
+ const intptr_t value = hook_.load(std::memory_order_acquire);
+ if (value == kUninitialized) {
+ return default_fn_;
+ }
+ return reinterpret_cast<FnPtr>(value);
+ }
+
+ bool DoStore(FnPtr fn) {
+ assert(fn);
+ const auto value = reinterpret_cast<intptr_t>(fn);
+ intptr_t expected = kUninitialized;
+ const bool store_succeeded = hook_.compare_exchange_strong(
+ expected, value, std::memory_order_acq_rel, std::memory_order_acquire);
+ const bool same_value_already_stored = (expected == value);
+ return store_succeeded || same_value_already_stored;
+ }
+
+ std::atomic<intptr_t> hook_;
+#endif
+
+ const FnPtr default_fn_;
+};
+
+#undef ABSL_HAVE_WORKING_ATOMIC_POINTER
+#undef ABSL_HAVE_WORKING_CONSTEXPR_STATIC_INIT
+
+} // namespace base_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_BASE_INTERNAL_ATOMIC_HOOK_H_
diff --git a/third_party/abseil/src/absl/base/internal/atomic_hook_test.cc b/third_party/abseil/src/absl/base/internal/atomic_hook_test.cc
new file mode 100644
index 0000000..e577a8f
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/atomic_hook_test.cc
@@ -0,0 +1,97 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/base/internal/atomic_hook.h"
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/base/attributes.h"
+#include "absl/base/internal/atomic_hook_test_helper.h"
+
+namespace {
+
+using ::testing::Eq;
+
+int value = 0;
+void TestHook(int x) { value = x; }
+
+TEST(AtomicHookTest, NoDefaultFunction) {
+ ABSL_INTERNAL_ATOMIC_HOOK_ATTRIBUTES static absl::base_internal::AtomicHook<
+ void (*)(int)>
+ hook;
+ value = 0;
+
+ // Test the default DummyFunction.
+ EXPECT_TRUE(hook.Load() == nullptr);
+ EXPECT_EQ(value, 0);
+ hook(1);
+ EXPECT_EQ(value, 0);
+
+ // Test a stored hook.
+ hook.Store(TestHook);
+ EXPECT_TRUE(hook.Load() == TestHook);
+ EXPECT_EQ(value, 0);
+ hook(1);
+ EXPECT_EQ(value, 1);
+
+ // Calling Store() with the same hook should not crash.
+ hook.Store(TestHook);
+ EXPECT_TRUE(hook.Load() == TestHook);
+ EXPECT_EQ(value, 1);
+ hook(2);
+ EXPECT_EQ(value, 2);
+}
+
+TEST(AtomicHookTest, WithDefaultFunction) {
+ // Set the default value to TestHook at compile-time.
+ ABSL_INTERNAL_ATOMIC_HOOK_ATTRIBUTES static absl::base_internal::AtomicHook<
+ void (*)(int)>
+ hook(TestHook);
+ value = 0;
+
+ // Test the default value is TestHook.
+ EXPECT_TRUE(hook.Load() == TestHook);
+ EXPECT_EQ(value, 0);
+ hook(1);
+ EXPECT_EQ(value, 1);
+
+ // Calling Store() with the same hook should not crash.
+ hook.Store(TestHook);
+ EXPECT_TRUE(hook.Load() == TestHook);
+ EXPECT_EQ(value, 1);
+ hook(2);
+ EXPECT_EQ(value, 2);
+}
+
+ABSL_CONST_INIT int override_func_calls = 0;
+void OverrideFunc() { override_func_calls++; }
+static struct OverrideInstaller {
+ OverrideInstaller() { absl::atomic_hook_internal::func.Store(OverrideFunc); }
+} override_installer;
+
+TEST(AtomicHookTest, DynamicInitFromAnotherTU) {
+ // MSVC 14.2 doesn't do constexpr static init correctly; in particular it
+ // tends to sequence static init (i.e. defaults) of `AtomicHook` objects
+ // after their dynamic init (i.e. overrides), overwriting whatever value was
+ // written during dynamic init. This regression test validates the fix.
+ // https://developercommunity.visualstudio.com/content/problem/336946/class-with-constexpr-constructor-not-using-static.html
+ EXPECT_THAT(absl::atomic_hook_internal::default_func_calls, Eq(0));
+ EXPECT_THAT(override_func_calls, Eq(0));
+ absl::atomic_hook_internal::func();
+ EXPECT_THAT(absl::atomic_hook_internal::default_func_calls, Eq(0));
+ EXPECT_THAT(override_func_calls, Eq(1));
+ EXPECT_THAT(absl::atomic_hook_internal::func.Load(), Eq(OverrideFunc));
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/base/internal/atomic_hook_test_helper.cc b/third_party/abseil/src/absl/base/internal/atomic_hook_test_helper.cc
new file mode 100644
index 0000000..537d47c
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/atomic_hook_test_helper.cc
@@ -0,0 +1,32 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/base/internal/atomic_hook_test_helper.h"
+
+#include "absl/base/attributes.h"
+#include "absl/base/internal/atomic_hook.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace atomic_hook_internal {
+
+ABSL_INTERNAL_ATOMIC_HOOK_ATTRIBUTES absl::base_internal::AtomicHook<VoidF>
+ func(DefaultFunc);
+ABSL_CONST_INIT int default_func_calls = 0;
+void DefaultFunc() { default_func_calls++; }
+void RegisterFunc(VoidF f) { func.Store(f); }
+
+} // namespace atomic_hook_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/base/internal/atomic_hook_test_helper.h b/third_party/abseil/src/absl/base/internal/atomic_hook_test_helper.h
new file mode 100644
index 0000000..3e72b49
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/atomic_hook_test_helper.h
@@ -0,0 +1,34 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_BASE_ATOMIC_HOOK_TEST_HELPER_H_
+#define ABSL_BASE_ATOMIC_HOOK_TEST_HELPER_H_
+
+#include "absl/base/internal/atomic_hook.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace atomic_hook_internal {
+
+using VoidF = void (*)();
+extern absl::base_internal::AtomicHook<VoidF> func;
+extern int default_func_calls;
+void DefaultFunc();
+void RegisterFunc(VoidF func);
+
+} // namespace atomic_hook_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_BASE_ATOMIC_HOOK_TEST_HELPER_H_
diff --git a/third_party/abseil/src/absl/base/internal/bits.h b/third_party/abseil/src/absl/base/internal/bits.h
new file mode 100644
index 0000000..81648e2
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/bits.h
@@ -0,0 +1,219 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_BASE_INTERNAL_BITS_H_
+#define ABSL_BASE_INTERNAL_BITS_H_
+
+// This file contains bitwise ops which are implementation details of various
+// absl libraries.
+
+#include <cstdint>
+
+#include "absl/base/config.h"
+
+// Clang on Windows has __builtin_clzll; otherwise we need to use the
+// windows intrinsic functions.
+#if defined(_MSC_VER) && !defined(__clang__)
+#include <intrin.h>
+#if defined(_M_X64)
+#pragma intrinsic(_BitScanReverse64)
+#pragma intrinsic(_BitScanForward64)
+#endif
+#pragma intrinsic(_BitScanReverse)
+#pragma intrinsic(_BitScanForward)
+#endif
+
+#include "absl/base/attributes.h"
+
+#if defined(_MSC_VER) && !defined(__clang__)
+// We can achieve something similar to attribute((always_inline)) with MSVC by
+// using the __forceinline keyword, however this is not perfect. MSVC is
+// much less aggressive about inlining, and even with the __forceinline keyword.
+#define ABSL_BASE_INTERNAL_FORCEINLINE __forceinline
+#else
+// Use default attribute inline.
+#define ABSL_BASE_INTERNAL_FORCEINLINE inline ABSL_ATTRIBUTE_ALWAYS_INLINE
+#endif
+
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace base_internal {
+
+ABSL_BASE_INTERNAL_FORCEINLINE int CountLeadingZeros64Slow(uint64_t n) {
+ int zeroes = 60;
+ if (n >> 32) {
+ zeroes -= 32;
+ n >>= 32;
+ }
+ if (n >> 16) {
+ zeroes -= 16;
+ n >>= 16;
+ }
+ if (n >> 8) {
+ zeroes -= 8;
+ n >>= 8;
+ }
+ if (n >> 4) {
+ zeroes -= 4;
+ n >>= 4;
+ }
+ return "\4\3\2\2\1\1\1\1\0\0\0\0\0\0\0"[n] + zeroes;
+}
+
+ABSL_BASE_INTERNAL_FORCEINLINE int CountLeadingZeros64(uint64_t n) {
+#if defined(_MSC_VER) && !defined(__clang__) && defined(_M_X64)
+ // MSVC does not have __buitin_clzll. Use _BitScanReverse64.
+ unsigned long result = 0; // NOLINT(runtime/int)
+ if (_BitScanReverse64(&result, n)) {
+ return 63 - result;
+ }
+ return 64;
+#elif defined(_MSC_VER) && !defined(__clang__)
+ // MSVC does not have __buitin_clzll. Compose two calls to _BitScanReverse
+ unsigned long result = 0; // NOLINT(runtime/int)
+ if ((n >> 32) &&
+ _BitScanReverse(&result, static_cast<unsigned long>(n >> 32))) {
+ return 31 - result;
+ }
+ if (_BitScanReverse(&result, static_cast<unsigned long>(n))) {
+ return 63 - result;
+ }
+ return 64;
+#elif defined(__GNUC__) || defined(__clang__)
+ // Use __builtin_clzll, which uses the following instructions:
+ // x86: bsr
+ // ARM64: clz
+ // PPC: cntlzd
+ static_assert(sizeof(unsigned long long) == sizeof(n), // NOLINT(runtime/int)
+ "__builtin_clzll does not take 64-bit arg");
+
+ // Handle 0 as a special case because __builtin_clzll(0) is undefined.
+ if (n == 0) {
+ return 64;
+ }
+ return __builtin_clzll(n);
+#else
+ return CountLeadingZeros64Slow(n);
+#endif
+}
+
+ABSL_BASE_INTERNAL_FORCEINLINE int CountLeadingZeros32Slow(uint64_t n) {
+ int zeroes = 28;
+ if (n >> 16) {
+ zeroes -= 16;
+ n >>= 16;
+ }
+ if (n >> 8) {
+ zeroes -= 8;
+ n >>= 8;
+ }
+ if (n >> 4) {
+ zeroes -= 4;
+ n >>= 4;
+ }
+ return "\4\3\2\2\1\1\1\1\0\0\0\0\0\0\0"[n] + zeroes;
+}
+
+ABSL_BASE_INTERNAL_FORCEINLINE int CountLeadingZeros32(uint32_t n) {
+#if defined(_MSC_VER) && !defined(__clang__)
+ unsigned long result = 0; // NOLINT(runtime/int)
+ if (_BitScanReverse(&result, n)) {
+ return 31 - result;
+ }
+ return 32;
+#elif defined(__GNUC__) || defined(__clang__)
+ // Use __builtin_clz, which uses the following instructions:
+ // x86: bsr
+ // ARM64: clz
+ // PPC: cntlzd
+ static_assert(sizeof(int) == sizeof(n),
+ "__builtin_clz does not take 32-bit arg");
+
+ // Handle 0 as a special case because __builtin_clz(0) is undefined.
+ if (n == 0) {
+ return 32;
+ }
+ return __builtin_clz(n);
+#else
+ return CountLeadingZeros32Slow(n);
+#endif
+}
+
+ABSL_BASE_INTERNAL_FORCEINLINE int CountTrailingZerosNonZero64Slow(uint64_t n) {
+ int c = 63;
+ n &= ~n + 1;
+ if (n & 0x00000000FFFFFFFF) c -= 32;
+ if (n & 0x0000FFFF0000FFFF) c -= 16;
+ if (n & 0x00FF00FF00FF00FF) c -= 8;
+ if (n & 0x0F0F0F0F0F0F0F0F) c -= 4;
+ if (n & 0x3333333333333333) c -= 2;
+ if (n & 0x5555555555555555) c -= 1;
+ return c;
+}
+
+ABSL_BASE_INTERNAL_FORCEINLINE int CountTrailingZerosNonZero64(uint64_t n) {
+#if defined(_MSC_VER) && !defined(__clang__) && defined(_M_X64)
+ unsigned long result = 0; // NOLINT(runtime/int)
+ _BitScanForward64(&result, n);
+ return result;
+#elif defined(_MSC_VER) && !defined(__clang__)
+ unsigned long result = 0; // NOLINT(runtime/int)
+ if (static_cast<uint32_t>(n) == 0) {
+ _BitScanForward(&result, static_cast<unsigned long>(n >> 32));
+ return result + 32;
+ }
+ _BitScanForward(&result, static_cast<unsigned long>(n));
+ return result;
+#elif defined(__GNUC__) || defined(__clang__)
+ static_assert(sizeof(unsigned long long) == sizeof(n), // NOLINT(runtime/int)
+ "__builtin_ctzll does not take 64-bit arg");
+ return __builtin_ctzll(n);
+#else
+ return CountTrailingZerosNonZero64Slow(n);
+#endif
+}
+
+ABSL_BASE_INTERNAL_FORCEINLINE int CountTrailingZerosNonZero32Slow(uint32_t n) {
+ int c = 31;
+ n &= ~n + 1;
+ if (n & 0x0000FFFF) c -= 16;
+ if (n & 0x00FF00FF) c -= 8;
+ if (n & 0x0F0F0F0F) c -= 4;
+ if (n & 0x33333333) c -= 2;
+ if (n & 0x55555555) c -= 1;
+ return c;
+}
+
+ABSL_BASE_INTERNAL_FORCEINLINE int CountTrailingZerosNonZero32(uint32_t n) {
+#if defined(_MSC_VER) && !defined(__clang__)
+ unsigned long result = 0; // NOLINT(runtime/int)
+ _BitScanForward(&result, n);
+ return result;
+#elif defined(__GNUC__) || defined(__clang__)
+ static_assert(sizeof(int) == sizeof(n),
+ "__builtin_ctz does not take 32-bit arg");
+ return __builtin_ctz(n);
+#else
+ return CountTrailingZerosNonZero32Slow(n);
+#endif
+}
+
+#undef ABSL_BASE_INTERNAL_FORCEINLINE
+
+} // namespace base_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_BASE_INTERNAL_BITS_H_
diff --git a/third_party/abseil/src/absl/base/internal/bits_test.cc b/third_party/abseil/src/absl/base/internal/bits_test.cc
new file mode 100644
index 0000000..7855fa6
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/bits_test.cc
@@ -0,0 +1,97 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/base/internal/bits.h"
+
+#include "gtest/gtest.h"
+
+namespace {
+
+int CLZ64(uint64_t n) {
+ int fast = absl::base_internal::CountLeadingZeros64(n);
+ int slow = absl::base_internal::CountLeadingZeros64Slow(n);
+ EXPECT_EQ(fast, slow) << n;
+ return fast;
+}
+
+TEST(BitsTest, CountLeadingZeros64) {
+ EXPECT_EQ(64, CLZ64(uint64_t{}));
+ EXPECT_EQ(0, CLZ64(~uint64_t{}));
+
+ for (int index = 0; index < 64; index++) {
+ uint64_t x = static_cast<uint64_t>(1) << index;
+ const auto cnt = 63 - index;
+ ASSERT_EQ(cnt, CLZ64(x)) << index;
+ ASSERT_EQ(cnt, CLZ64(x + x - 1)) << index;
+ }
+}
+
+int CLZ32(uint32_t n) {
+ int fast = absl::base_internal::CountLeadingZeros32(n);
+ int slow = absl::base_internal::CountLeadingZeros32Slow(n);
+ EXPECT_EQ(fast, slow) << n;
+ return fast;
+}
+
+TEST(BitsTest, CountLeadingZeros32) {
+ EXPECT_EQ(32, CLZ32(uint32_t{}));
+ EXPECT_EQ(0, CLZ32(~uint32_t{}));
+
+ for (int index = 0; index < 32; index++) {
+ uint32_t x = static_cast<uint32_t>(1) << index;
+ const auto cnt = 31 - index;
+ ASSERT_EQ(cnt, CLZ32(x)) << index;
+ ASSERT_EQ(cnt, CLZ32(x + x - 1)) << index;
+ ASSERT_EQ(CLZ64(x), CLZ32(x) + 32);
+ }
+}
+
+int CTZ64(uint64_t n) {
+ int fast = absl::base_internal::CountTrailingZerosNonZero64(n);
+ int slow = absl::base_internal::CountTrailingZerosNonZero64Slow(n);
+ EXPECT_EQ(fast, slow) << n;
+ return fast;
+}
+
+TEST(BitsTest, CountTrailingZerosNonZero64) {
+ EXPECT_EQ(0, CTZ64(~uint64_t{}));
+
+ for (int index = 0; index < 64; index++) {
+ uint64_t x = static_cast<uint64_t>(1) << index;
+ const auto cnt = index;
+ ASSERT_EQ(cnt, CTZ64(x)) << index;
+ ASSERT_EQ(cnt, CTZ64(~(x - 1))) << index;
+ }
+}
+
+int CTZ32(uint32_t n) {
+ int fast = absl::base_internal::CountTrailingZerosNonZero32(n);
+ int slow = absl::base_internal::CountTrailingZerosNonZero32Slow(n);
+ EXPECT_EQ(fast, slow) << n;
+ return fast;
+}
+
+TEST(BitsTest, CountTrailingZerosNonZero32) {
+ EXPECT_EQ(0, CTZ32(~uint32_t{}));
+
+ for (int index = 0; index < 32; index++) {
+ uint32_t x = static_cast<uint32_t>(1) << index;
+ const auto cnt = index;
+ ASSERT_EQ(cnt, CTZ32(x)) << index;
+ ASSERT_EQ(cnt, CTZ32(~(x - 1))) << index;
+ }
+}
+
+
+} // namespace
diff --git a/third_party/abseil/src/absl/base/internal/cmake_thread_test.cc b/third_party/abseil/src/absl/base/internal/cmake_thread_test.cc
new file mode 100644
index 0000000..f70bb24
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/cmake_thread_test.cc
@@ -0,0 +1,22 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <iostream>
+#include "absl/base/internal/thread_identity.h"
+
+int main() {
+ auto* tid = absl::base_internal::CurrentThreadIdentityIfPresent();
+ // Make sure the above call can't be optimized out
+ std::cout << (void*)tid << std::endl;
+}
diff --git a/third_party/abseil/src/absl/base/internal/cycleclock.cc b/third_party/abseil/src/absl/base/internal/cycleclock.cc
new file mode 100644
index 0000000..0e65005
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/cycleclock.cc
@@ -0,0 +1,107 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// The implementation of CycleClock::Frequency.
+//
+// NOTE: only i386 and x86_64 have been well tested.
+// PPC, sparc, alpha, and ia64 are based on
+// http://peter.kuscsik.com/wordpress/?p=14
+// with modifications by m3b. See also
+// https://setisvn.ssl.berkeley.edu/svn/lib/fftw-3.0.1/kernel/cycle.h
+
+#include "absl/base/internal/cycleclock.h"
+
+#include <atomic>
+#include <chrono> // NOLINT(build/c++11)
+
+#include "absl/base/internal/unscaledcycleclock.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace base_internal {
+
+#if ABSL_USE_UNSCALED_CYCLECLOCK
+
+namespace {
+
+#ifdef NDEBUG
+#ifdef ABSL_INTERNAL_UNSCALED_CYCLECLOCK_FREQUENCY_IS_CPU_FREQUENCY
+// Not debug mode and the UnscaledCycleClock frequency is the CPU
+// frequency. Scale the CycleClock to prevent overflow if someone
+// tries to represent the time as cycles since the Unix epoch.
+static constexpr int32_t kShift = 1;
+#else
+// Not debug mode and the UnscaledCycleClock isn't operating at the
+// raw CPU frequency. There is no need to do any scaling, so don't
+// needlessly sacrifice precision.
+static constexpr int32_t kShift = 0;
+#endif
+#else
+// In debug mode use a different shift to discourage depending on a
+// particular shift value.
+static constexpr int32_t kShift = 2;
+#endif
+
+static constexpr double kFrequencyScale = 1.0 / (1 << kShift);
+static std::atomic<CycleClockSourceFunc> cycle_clock_source;
+
+CycleClockSourceFunc LoadCycleClockSource() {
+ // Optimize for the common case (no callback) by first doing a relaxed load;
+ // this is significantly faster on non-x86 platforms.
+ if (cycle_clock_source.load(std::memory_order_relaxed) == nullptr) {
+ return nullptr;
+ }
+ // This corresponds to the store(std::memory_order_release) in
+ // CycleClockSource::Register, and makes sure that any updates made prior to
+ // registering the callback are visible to this thread before the callback is
+ // invoked.
+ return cycle_clock_source.load(std::memory_order_acquire);
+}
+
+} // namespace
+
+int64_t CycleClock::Now() {
+ auto fn = LoadCycleClockSource();
+ if (fn == nullptr) {
+ return base_internal::UnscaledCycleClock::Now() >> kShift;
+ }
+ return fn() >> kShift;
+}
+
+double CycleClock::Frequency() {
+ return kFrequencyScale * base_internal::UnscaledCycleClock::Frequency();
+}
+
+void CycleClockSource::Register(CycleClockSourceFunc source) {
+ // Corresponds to the load(std::memory_order_acquire) in LoadCycleClockSource.
+ cycle_clock_source.store(source, std::memory_order_release);
+}
+
+#else
+
+int64_t CycleClock::Now() {
+ return std::chrono::duration_cast<std::chrono::nanoseconds>(
+ std::chrono::steady_clock::now().time_since_epoch())
+ .count();
+}
+
+double CycleClock::Frequency() {
+ return 1e9;
+}
+
+#endif
+
+} // namespace base_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/base/internal/cycleclock.h b/third_party/abseil/src/absl/base/internal/cycleclock.h
new file mode 100644
index 0000000..a18b584
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/cycleclock.h
@@ -0,0 +1,94 @@
+//
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+// -----------------------------------------------------------------------------
+// File: cycleclock.h
+// -----------------------------------------------------------------------------
+//
+// This header file defines a `CycleClock`, which yields the value and frequency
+// of a cycle counter that increments at a rate that is approximately constant.
+//
+// NOTE:
+//
+// The cycle counter frequency is not necessarily related to the core clock
+// frequency and should not be treated as such. That is, `CycleClock` cycles are
+// not necessarily "CPU cycles" and code should not rely on that behavior, even
+// if experimentally observed.
+//
+// An arbitrary offset may have been added to the counter at power on.
+//
+// On some platforms, the rate and offset of the counter may differ
+// slightly when read from different CPUs of a multiprocessor. Usually,
+// we try to ensure that the operating system adjusts values periodically
+// so that values agree approximately. If you need stronger guarantees,
+// consider using alternate interfaces.
+//
+// The CPU is not required to maintain the ordering of a cycle counter read
+// with respect to surrounding instructions.
+
+#ifndef ABSL_BASE_INTERNAL_CYCLECLOCK_H_
+#define ABSL_BASE_INTERNAL_CYCLECLOCK_H_
+
+#include <cstdint>
+
+#include "absl/base/config.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace base_internal {
+
+// -----------------------------------------------------------------------------
+// CycleClock
+// -----------------------------------------------------------------------------
+class CycleClock {
+ public:
+ // CycleClock::Now()
+ //
+ // Returns the value of a cycle counter that counts at a rate that is
+ // approximately constant.
+ static int64_t Now();
+
+ // CycleClock::Frequency()
+ //
+ // Returns the amount by which `CycleClock::Now()` increases per second. Note
+ // that this value may not necessarily match the core CPU clock frequency.
+ static double Frequency();
+
+ private:
+ CycleClock() = delete; // no instances
+ CycleClock(const CycleClock&) = delete;
+ CycleClock& operator=(const CycleClock&) = delete;
+};
+
+using CycleClockSourceFunc = int64_t (*)();
+
+class CycleClockSource {
+ private:
+ // CycleClockSource::Register()
+ //
+ // Register a function that provides an alternate source for the unscaled CPU
+ // cycle count value. The source function must be async signal safe, must not
+ // call CycleClock::Now(), and must have a frequency that matches that of the
+ // unscaled clock used by CycleClock. A nullptr value resets CycleClock to use
+ // the default source.
+ static void Register(CycleClockSourceFunc source);
+};
+
+} // namespace base_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_BASE_INTERNAL_CYCLECLOCK_H_
diff --git a/third_party/abseil/src/absl/base/internal/direct_mmap.h b/third_party/abseil/src/absl/base/internal/direct_mmap.h
new file mode 100644
index 0000000..16accf0
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/direct_mmap.h
@@ -0,0 +1,166 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// Functions for directly invoking mmap() via syscall, avoiding the case where
+// mmap() has been locally overridden.
+
+#ifndef ABSL_BASE_INTERNAL_DIRECT_MMAP_H_
+#define ABSL_BASE_INTERNAL_DIRECT_MMAP_H_
+
+#include "absl/base/config.h"
+
+#if ABSL_HAVE_MMAP
+
+#include <sys/mman.h>
+
+#ifdef __linux__
+
+#include <sys/types.h>
+#ifdef __BIONIC__
+#include <sys/syscall.h>
+#else
+#include <syscall.h>
+#endif
+
+#include <linux/unistd.h>
+#include <unistd.h>
+#include <cerrno>
+#include <cstdarg>
+#include <cstdint>
+
+#ifdef __mips__
+// Include definitions of the ABI currently in use.
+#ifdef __BIONIC__
+// Android doesn't have sgidefs.h, but does have asm/sgidefs.h, which has the
+// definitions we need.
+#include <asm/sgidefs.h>
+#else
+#include <sgidefs.h>
+#endif // __BIONIC__
+#endif // __mips__
+
+// SYS_mmap and SYS_munmap are not defined in Android.
+#ifdef __BIONIC__
+extern "C" void* __mmap2(void*, size_t, int, int, int, size_t);
+#if defined(__NR_mmap) && !defined(SYS_mmap)
+#define SYS_mmap __NR_mmap
+#endif
+#ifndef SYS_munmap
+#define SYS_munmap __NR_munmap
+#endif
+#endif // __BIONIC__
+
+#if defined(__NR_mmap2) && !defined(SYS_mmap2)
+#define SYS_mmap2 __NR_mmap2
+#endif
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace base_internal {
+
+// Platform specific logic extracted from
+// https://chromium.googlesource.com/linux-syscall-support/+/master/linux_syscall_support.h
+inline void* DirectMmap(void* start, size_t length, int prot, int flags, int fd,
+ off64_t offset) noexcept {
+#if defined(__i386__) || defined(__ARM_ARCH_3__) || defined(__ARM_EABI__) || \
+ (defined(__mips__) && _MIPS_SIM == _MIPS_SIM_ABI32) || \
+ (defined(__PPC__) && !defined(__PPC64__)) || \
+ (defined(__riscv) && __riscv_xlen == 32) || \
+ (defined(__s390__) && !defined(__s390x__))
+ // On these architectures, implement mmap with mmap2.
+ static int pagesize = 0;
+ if (pagesize == 0) {
+#if defined(__wasm__) || defined(__asmjs__)
+ pagesize = getpagesize();
+#else
+ pagesize = sysconf(_SC_PAGESIZE);
+#endif
+ }
+ if (offset < 0 || offset % pagesize != 0) {
+ errno = EINVAL;
+ return MAP_FAILED;
+ }
+#ifdef __BIONIC__
+ // SYS_mmap2 has problems on Android API level <= 16.
+ // Workaround by invoking __mmap2() instead.
+ return __mmap2(start, length, prot, flags, fd, offset / pagesize);
+#else
+ return reinterpret_cast<void*>(
+ syscall(SYS_mmap2, start, length, prot, flags, fd,
+ static_cast<off_t>(offset / pagesize)));
+#endif
+#elif defined(__s390x__)
+ // On s390x, mmap() arguments are passed in memory.
+ unsigned long buf[6] = {reinterpret_cast<unsigned long>(start), // NOLINT
+ static_cast<unsigned long>(length), // NOLINT
+ static_cast<unsigned long>(prot), // NOLINT
+ static_cast<unsigned long>(flags), // NOLINT
+ static_cast<unsigned long>(fd), // NOLINT
+ static_cast<unsigned long>(offset)}; // NOLINT
+ return reinterpret_cast<void*>(syscall(SYS_mmap, buf));
+#elif defined(__x86_64__)
+// The x32 ABI has 32 bit longs, but the syscall interface is 64 bit.
+// We need to explicitly cast to an unsigned 64 bit type to avoid implicit
+// sign extension. We can't cast pointers directly because those are
+// 32 bits, and gcc will dump ugly warnings about casting from a pointer
+// to an integer of a different size. We also need to make sure __off64_t
+// isn't truncated to 32-bits under x32.
+#define MMAP_SYSCALL_ARG(x) ((uint64_t)(uintptr_t)(x))
+ return reinterpret_cast<void*>(
+ syscall(SYS_mmap, MMAP_SYSCALL_ARG(start), MMAP_SYSCALL_ARG(length),
+ MMAP_SYSCALL_ARG(prot), MMAP_SYSCALL_ARG(flags),
+ MMAP_SYSCALL_ARG(fd), static_cast<uint64_t>(offset)));
+#undef MMAP_SYSCALL_ARG
+#else // Remaining 64-bit aritectures.
+ static_assert(sizeof(unsigned long) == 8, "Platform is not 64-bit");
+ return reinterpret_cast<void*>(
+ syscall(SYS_mmap, start, length, prot, flags, fd, offset));
+#endif
+}
+
+inline int DirectMunmap(void* start, size_t length) {
+ return static_cast<int>(syscall(SYS_munmap, start, length));
+}
+
+} // namespace base_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#else // !__linux__
+
+// For non-linux platforms where we have mmap, just dispatch directly to the
+// actual mmap()/munmap() methods.
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace base_internal {
+
+inline void* DirectMmap(void* start, size_t length, int prot, int flags, int fd,
+ off_t offset) {
+ return mmap(start, length, prot, flags, fd, offset);
+}
+
+inline int DirectMunmap(void* start, size_t length) {
+ return munmap(start, length);
+}
+
+} // namespace base_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // __linux__
+
+#endif // ABSL_HAVE_MMAP
+
+#endif // ABSL_BASE_INTERNAL_DIRECT_MMAP_H_
diff --git a/third_party/abseil/src/absl/base/internal/dynamic_annotations.h b/third_party/abseil/src/absl/base/internal/dynamic_annotations.h
new file mode 100644
index 0000000..b23c5ec
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/dynamic_annotations.h
@@ -0,0 +1,398 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// This file defines dynamic annotations for use with dynamic analysis tool
+// such as valgrind, PIN, etc.
+//
+// Dynamic annotation is a source code annotation that affects the generated
+// code (that is, the annotation is not a comment). Each such annotation is
+// attached to a particular instruction and/or to a particular object (address)
+// in the program.
+//
+// The annotations that should be used by users are macros in all upper-case
+// (e.g., ANNOTATE_THREAD_NAME).
+//
+// Actual implementation of these macros may differ depending on the dynamic
+// analysis tool being used.
+//
+// This file supports the following configurations:
+// - Dynamic Annotations enabled (with static thread-safety warnings disabled).
+// In this case, macros expand to functions implemented by Thread Sanitizer,
+// when building with TSan. When not provided an external implementation,
+// dynamic_annotations.cc provides no-op implementations.
+//
+// - Static Clang thread-safety warnings enabled.
+// When building with a Clang compiler that supports thread-safety warnings,
+// a subset of annotations can be statically-checked at compile-time. We
+// expand these macros to static-inline functions that can be analyzed for
+// thread-safety, but afterwards elided when building the final binary.
+//
+// - All annotations are disabled.
+// If neither Dynamic Annotations nor Clang thread-safety warnings are
+// enabled, then all annotation-macros expand to empty.
+
+#ifndef ABSL_BASE_INTERNAL_DYNAMIC_ANNOTATIONS_H_
+#define ABSL_BASE_INTERNAL_DYNAMIC_ANNOTATIONS_H_
+
+#include <stddef.h>
+
+#include "absl/base/config.h"
+
+// -------------------------------------------------------------------------
+// Decide which features are enabled
+
+#ifndef DYNAMIC_ANNOTATIONS_ENABLED
+#define DYNAMIC_ANNOTATIONS_ENABLED 0
+#endif
+
+#if defined(__clang__) && !defined(SWIG)
+#define ABSL_INTERNAL_IGNORE_READS_ATTRIBUTE_ENABLED 1
+#endif
+
+#if DYNAMIC_ANNOTATIONS_ENABLED != 0
+
+#define ABSL_INTERNAL_RACE_ANNOTATIONS_ENABLED 1
+#define ABSL_INTERNAL_READS_ANNOTATIONS_ENABLED 1
+#define ABSL_INTERNAL_WRITES_ANNOTATIONS_ENABLED 1
+#define ABSL_INTERNAL_ANNOTALYSIS_ENABLED 0
+#define ABSL_INTERNAL_READS_WRITES_ANNOTATIONS_ENABLED 1
+
+#else
+
+#define ABSL_INTERNAL_RACE_ANNOTATIONS_ENABLED 0
+#define ABSL_INTERNAL_READS_ANNOTATIONS_ENABLED 0
+#define ABSL_INTERNAL_WRITES_ANNOTATIONS_ENABLED 0
+
+// Clang provides limited support for static thread-safety analysis through a
+// feature called Annotalysis. We configure macro-definitions according to
+// whether Annotalysis support is available. When running in opt-mode, GCC
+// will issue a warning, if these attributes are compiled. Only include them
+// when compiling using Clang.
+
+// ANNOTALYSIS_ENABLED == 1 when IGNORE_READ_ATTRIBUTE_ENABLED == 1
+#define ABSL_INTERNAL_ANNOTALYSIS_ENABLED \
+ defined(ABSL_INTERNAL_IGNORE_READS_ATTRIBUTE_ENABLED)
+// Read/write annotations are enabled in Annotalysis mode; disabled otherwise.
+#define ABSL_INTERNAL_READS_WRITES_ANNOTATIONS_ENABLED \
+ ABSL_INTERNAL_ANNOTALYSIS_ENABLED
+#endif
+
+// Memory annotations are also made available to LLVM's Memory Sanitizer
+#if defined(ABSL_HAVE_MEMORY_SANITIZER) && !defined(__native_client__)
+#define ABSL_INTERNAL_MEMORY_ANNOTATIONS_ENABLED 1
+#endif
+
+#ifndef ABSL_INTERNAL_MEMORY_ANNOTATIONS_ENABLED
+#define ABSL_INTERNAL_MEMORY_ANNOTATIONS_ENABLED 0
+#endif
+
+#ifdef __cplusplus
+#define ABSL_INTERNAL_BEGIN_EXTERN_C extern "C" {
+#define ABSL_INTERNAL_END_EXTERN_C } // extern "C"
+#define ABSL_INTERNAL_GLOBAL_SCOPED(F) ::F
+#define ABSL_INTERNAL_STATIC_INLINE inline
+#else
+#define ABSL_INTERNAL_BEGIN_EXTERN_C // empty
+#define ABSL_INTERNAL_END_EXTERN_C // empty
+#define ABSL_INTERNAL_GLOBAL_SCOPED(F) F
+#define ABSL_INTERNAL_STATIC_INLINE static inline
+#endif
+
+// -------------------------------------------------------------------------
+// Define race annotations.
+
+#if ABSL_INTERNAL_RACE_ANNOTATIONS_ENABLED == 1
+
+// -------------------------------------------------------------
+// Annotations that suppress errors. It is usually better to express the
+// program's synchronization using the other annotations, but these can be used
+// when all else fails.
+
+// Report that we may have a benign race at `pointer`, with size
+// "sizeof(*(pointer))". `pointer` must be a non-void* pointer. Insert at the
+// point where `pointer` has been allocated, preferably close to the point
+// where the race happens. See also ANNOTATE_BENIGN_RACE_STATIC.
+#define ANNOTATE_BENIGN_RACE(pointer, description) \
+ ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateBenignRaceSized) \
+ (__FILE__, __LINE__, pointer, sizeof(*(pointer)), description)
+
+// Same as ANNOTATE_BENIGN_RACE(`address`, `description`), but applies to
+// the memory range [`address`, `address`+`size`).
+#define ANNOTATE_BENIGN_RACE_SIZED(address, size, description) \
+ ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateBenignRaceSized) \
+ (__FILE__, __LINE__, address, size, description)
+
+// Enable (`enable`!=0) or disable (`enable`==0) race detection for all threads.
+// This annotation could be useful if you want to skip expensive race analysis
+// during some period of program execution, e.g. during initialization.
+#define ANNOTATE_ENABLE_RACE_DETECTION(enable) \
+ ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateEnableRaceDetection) \
+ (__FILE__, __LINE__, enable)
+
+// -------------------------------------------------------------
+// Annotations useful for debugging.
+
+// Report the current thread `name` to a race detector.
+#define ANNOTATE_THREAD_NAME(name) \
+ ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateThreadName)(__FILE__, __LINE__, name)
+
+// -------------------------------------------------------------
+// Annotations useful when implementing locks. They are not normally needed by
+// modules that merely use locks. The `lock` argument is a pointer to the lock
+// object.
+
+// Report that a lock has been created at address `lock`.
+#define ANNOTATE_RWLOCK_CREATE(lock) \
+ ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateRWLockCreate)(__FILE__, __LINE__, lock)
+
+// Report that a linker initialized lock has been created at address `lock`.
+#ifdef ABSL_HAVE_THREAD_SANITIZER
+#define ANNOTATE_RWLOCK_CREATE_STATIC(lock) \
+ ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateRWLockCreateStatic) \
+ (__FILE__, __LINE__, lock)
+#else
+#define ANNOTATE_RWLOCK_CREATE_STATIC(lock) ANNOTATE_RWLOCK_CREATE(lock)
+#endif
+
+// Report that the lock at address `lock` is about to be destroyed.
+#define ANNOTATE_RWLOCK_DESTROY(lock) \
+ ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateRWLockDestroy)(__FILE__, __LINE__, lock)
+
+// Report that the lock at address `lock` has been acquired.
+// `is_w`=1 for writer lock, `is_w`=0 for reader lock.
+#define ANNOTATE_RWLOCK_ACQUIRED(lock, is_w) \
+ ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateRWLockAcquired) \
+ (__FILE__, __LINE__, lock, is_w)
+
+// Report that the lock at address `lock` is about to be released.
+// `is_w`=1 for writer lock, `is_w`=0 for reader lock.
+#define ANNOTATE_RWLOCK_RELEASED(lock, is_w) \
+ ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateRWLockReleased) \
+ (__FILE__, __LINE__, lock, is_w)
+
+// Apply ANNOTATE_BENIGN_RACE_SIZED to a static variable `static_var`.
+#define ANNOTATE_BENIGN_RACE_STATIC(static_var, description) \
+ namespace { \
+ class static_var##_annotator { \
+ public: \
+ static_var##_annotator() { \
+ ANNOTATE_BENIGN_RACE_SIZED(&static_var, sizeof(static_var), \
+ #static_var ": " description); \
+ } \
+ }; \
+ static static_var##_annotator the##static_var##_annotator; \
+ } // namespace
+
+#else // ABSL_INTERNAL_RACE_ANNOTATIONS_ENABLED == 0
+
+#define ANNOTATE_RWLOCK_CREATE(lock) // empty
+#define ANNOTATE_RWLOCK_CREATE_STATIC(lock) // empty
+#define ANNOTATE_RWLOCK_DESTROY(lock) // empty
+#define ANNOTATE_RWLOCK_ACQUIRED(lock, is_w) // empty
+#define ANNOTATE_RWLOCK_RELEASED(lock, is_w) // empty
+#define ANNOTATE_BENIGN_RACE(address, description) // empty
+#define ANNOTATE_BENIGN_RACE_SIZED(address, size, description) // empty
+#define ANNOTATE_THREAD_NAME(name) // empty
+#define ANNOTATE_ENABLE_RACE_DETECTION(enable) // empty
+#define ANNOTATE_BENIGN_RACE_STATIC(static_var, description) // empty
+
+#endif // ABSL_INTERNAL_RACE_ANNOTATIONS_ENABLED
+
+// -------------------------------------------------------------------------
+// Define memory annotations.
+
+#if ABSL_INTERNAL_MEMORY_ANNOTATIONS_ENABLED == 1
+
+#include <sanitizer/msan_interface.h>
+
+#define ANNOTATE_MEMORY_IS_INITIALIZED(address, size) \
+ __msan_unpoison(address, size)
+
+#define ANNOTATE_MEMORY_IS_UNINITIALIZED(address, size) \
+ __msan_allocated_memory(address, size)
+
+#else // ABSL_INTERNAL_MEMORY_ANNOTATIONS_ENABLED == 0
+
+#if DYNAMIC_ANNOTATIONS_ENABLED == 1
+#define ANNOTATE_MEMORY_IS_INITIALIZED(address, size) \
+ do { \
+ (void)(address); \
+ (void)(size); \
+ } while (0)
+#define ANNOTATE_MEMORY_IS_UNINITIALIZED(address, size) \
+ do { \
+ (void)(address); \
+ (void)(size); \
+ } while (0)
+#else
+#define ANNOTATE_MEMORY_IS_INITIALIZED(address, size) // empty
+#define ANNOTATE_MEMORY_IS_UNINITIALIZED(address, size) // empty
+#endif
+
+#endif // ABSL_INTERNAL_MEMORY_ANNOTATIONS_ENABLED
+
+// -------------------------------------------------------------------------
+// Define IGNORE_READS_BEGIN/_END attributes.
+
+#if defined(ABSL_INTERNAL_IGNORE_READS_ATTRIBUTE_ENABLED)
+
+#define ABSL_INTERNAL_IGNORE_READS_BEGIN_ATTRIBUTE \
+ __attribute((exclusive_lock_function("*")))
+#define ABSL_INTERNAL_IGNORE_READS_END_ATTRIBUTE \
+ __attribute((unlock_function("*")))
+
+#else // !defined(ABSL_INTERNAL_IGNORE_READS_ATTRIBUTE_ENABLED)
+
+#define ABSL_INTERNAL_IGNORE_READS_BEGIN_ATTRIBUTE // empty
+#define ABSL_INTERNAL_IGNORE_READS_END_ATTRIBUTE // empty
+
+#endif // defined(ABSL_INTERNAL_IGNORE_READS_ATTRIBUTE_ENABLED)
+
+// -------------------------------------------------------------------------
+// Define IGNORE_READS_BEGIN/_END annotations.
+
+#if ABSL_INTERNAL_READS_ANNOTATIONS_ENABLED == 1
+
+// Request the analysis tool to ignore all reads in the current thread until
+// ANNOTATE_IGNORE_READS_END is called. Useful to ignore intentional racey
+// reads, while still checking other reads and all writes.
+// See also ANNOTATE_UNPROTECTED_READ.
+#define ANNOTATE_IGNORE_READS_BEGIN() \
+ ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateIgnoreReadsBegin)(__FILE__, __LINE__)
+
+// Stop ignoring reads.
+#define ANNOTATE_IGNORE_READS_END() \
+ ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateIgnoreReadsEnd)(__FILE__, __LINE__)
+
+#elif defined(ABSL_INTERNAL_ANNOTALYSIS_ENABLED)
+
+// When Annotalysis is enabled without Dynamic Annotations, the use of
+// static-inline functions allows the annotations to be read at compile-time,
+// while still letting the compiler elide the functions from the final build.
+//
+// TODO(delesley) -- The exclusive lock here ignores writes as well, but
+// allows IGNORE_READS_AND_WRITES to work properly.
+
+#define ANNOTATE_IGNORE_READS_BEGIN() \
+ ABSL_INTERNAL_GLOBAL_SCOPED(AbslInternalAnnotateIgnoreReadsBegin)()
+
+#define ANNOTATE_IGNORE_READS_END() \
+ ABSL_INTERNAL_GLOBAL_SCOPED(AbslInternalAnnotateIgnoreReadsEnd)()
+
+#else
+
+#define ANNOTATE_IGNORE_READS_BEGIN() // empty
+#define ANNOTATE_IGNORE_READS_END() // empty
+
+#endif
+
+// -------------------------------------------------------------------------
+// Define IGNORE_WRITES_BEGIN/_END annotations.
+
+#if ABSL_INTERNAL_WRITES_ANNOTATIONS_ENABLED == 1
+
+// Similar to ANNOTATE_IGNORE_READS_BEGIN, but ignore writes instead.
+#define ANNOTATE_IGNORE_WRITES_BEGIN() \
+ ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateIgnoreWritesBegin)(__FILE__, __LINE__)
+
+// Stop ignoring writes.
+#define ANNOTATE_IGNORE_WRITES_END() \
+ ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateIgnoreWritesEnd)(__FILE__, __LINE__)
+
+#else
+
+#define ANNOTATE_IGNORE_WRITES_BEGIN() // empty
+#define ANNOTATE_IGNORE_WRITES_END() // empty
+
+#endif
+
+// -------------------------------------------------------------------------
+// Define the ANNOTATE_IGNORE_READS_AND_WRITES_* annotations using the more
+// primitive annotations defined above.
+//
+// Instead of doing
+// ANNOTATE_IGNORE_READS_BEGIN();
+// ... = x;
+// ANNOTATE_IGNORE_READS_END();
+// one can use
+// ... = ANNOTATE_UNPROTECTED_READ(x);
+
+#if defined(ABSL_INTERNAL_READS_WRITES_ANNOTATIONS_ENABLED)
+
+// Start ignoring all memory accesses (both reads and writes).
+#define ANNOTATE_IGNORE_READS_AND_WRITES_BEGIN() \
+ do { \
+ ANNOTATE_IGNORE_READS_BEGIN(); \
+ ANNOTATE_IGNORE_WRITES_BEGIN(); \
+ } while (0)
+
+// Stop ignoring both reads and writes.
+#define ANNOTATE_IGNORE_READS_AND_WRITES_END() \
+ do { \
+ ANNOTATE_IGNORE_WRITES_END(); \
+ ANNOTATE_IGNORE_READS_END(); \
+ } while (0)
+
+#ifdef __cplusplus
+// ANNOTATE_UNPROTECTED_READ is the preferred way to annotate racey reads.
+#define ANNOTATE_UNPROTECTED_READ(x) \
+ absl::base_internal::AnnotateUnprotectedRead(x)
+
+#endif
+
+#else
+
+#define ANNOTATE_IGNORE_READS_AND_WRITES_BEGIN() // empty
+#define ANNOTATE_IGNORE_READS_AND_WRITES_END() // empty
+#define ANNOTATE_UNPROTECTED_READ(x) (x)
+
+#endif
+
+// -------------------------------------------------------------------------
+// Address sanitizer annotations
+
+#ifdef ABSL_HAVE_ADDRESS_SANITIZER
+// Describe the current state of a contiguous container such as e.g.
+// std::vector or std::string. For more details see
+// sanitizer/common_interface_defs.h, which is provided by the compiler.
+#include <sanitizer/common_interface_defs.h>
+
+#define ANNOTATE_CONTIGUOUS_CONTAINER(beg, end, old_mid, new_mid) \
+ __sanitizer_annotate_contiguous_container(beg, end, old_mid, new_mid)
+#define ADDRESS_SANITIZER_REDZONE(name) \
+ struct { \
+ char x[8] __attribute__((aligned(8))); \
+ } name
+
+#else
+
+#define ANNOTATE_CONTIGUOUS_CONTAINER(beg, end, old_mid, new_mid)
+#define ADDRESS_SANITIZER_REDZONE(name) static_assert(true, "")
+
+#endif // ABSL_HAVE_ADDRESS_SANITIZER
+
+// -------------------------------------------------------------------------
+// Undefine the macros intended only for this file.
+
+#undef ABSL_INTERNAL_RACE_ANNOTATIONS_ENABLED
+#undef ABSL_INTERNAL_MEMORY_ANNOTATIONS_ENABLED
+#undef ABSL_INTERNAL_READS_ANNOTATIONS_ENABLED
+#undef ABSL_INTERNAL_WRITES_ANNOTATIONS_ENABLED
+#undef ABSL_INTERNAL_ANNOTALYSIS_ENABLED
+#undef ABSL_INTERNAL_READS_WRITES_ANNOTATIONS_ENABLED
+#undef ABSL_INTERNAL_BEGIN_EXTERN_C
+#undef ABSL_INTERNAL_END_EXTERN_C
+#undef ABSL_INTERNAL_STATIC_INLINE
+
+#endif // ABSL_BASE_INTERNAL_DYNAMIC_ANNOTATIONS_H_
diff --git a/third_party/abseil/src/absl/base/internal/endian.h b/third_party/abseil/src/absl/base/internal/endian.h
new file mode 100644
index 0000000..9677530
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/endian.h
@@ -0,0 +1,266 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+#ifndef ABSL_BASE_INTERNAL_ENDIAN_H_
+#define ABSL_BASE_INTERNAL_ENDIAN_H_
+
+// The following guarantees declaration of the byte swap functions
+#ifdef _MSC_VER
+#include <stdlib.h> // NOLINT(build/include)
+#elif defined(__FreeBSD__)
+#include <sys/endian.h>
+#elif defined(__GLIBC__)
+#include <byteswap.h> // IWYU pragma: export
+#endif
+
+#include <cstdint>
+#include "absl/base/config.h"
+#include "absl/base/internal/unaligned_access.h"
+#include "absl/base/port.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+// Use compiler byte-swapping intrinsics if they are available. 32-bit
+// and 64-bit versions are available in Clang and GCC as of GCC 4.3.0.
+// The 16-bit version is available in Clang and GCC only as of GCC 4.8.0.
+// For simplicity, we enable them all only for GCC 4.8.0 or later.
+#if defined(__clang__) || \
+ (defined(__GNUC__) && \
+ ((__GNUC__ == 4 && __GNUC_MINOR__ >= 8) || __GNUC__ >= 5))
+inline uint64_t gbswap_64(uint64_t host_int) {
+ return __builtin_bswap64(host_int);
+}
+inline uint32_t gbswap_32(uint32_t host_int) {
+ return __builtin_bswap32(host_int);
+}
+inline uint16_t gbswap_16(uint16_t host_int) {
+ return __builtin_bswap16(host_int);
+}
+
+#elif defined(_MSC_VER)
+inline uint64_t gbswap_64(uint64_t host_int) {
+ return _byteswap_uint64(host_int);
+}
+inline uint32_t gbswap_32(uint32_t host_int) {
+ return _byteswap_ulong(host_int);
+}
+inline uint16_t gbswap_16(uint16_t host_int) {
+ return _byteswap_ushort(host_int);
+}
+
+#else
+inline uint64_t gbswap_64(uint64_t host_int) {
+#if defined(__GNUC__) && defined(__x86_64__) && !defined(__APPLE__)
+ // Adapted from /usr/include/byteswap.h. Not available on Mac.
+ if (__builtin_constant_p(host_int)) {
+ return __bswap_constant_64(host_int);
+ } else {
+ uint64_t result;
+ __asm__("bswap %0" : "=r"(result) : "0"(host_int));
+ return result;
+ }
+#elif defined(__GLIBC__)
+ return bswap_64(host_int);
+#else
+ return (((host_int & uint64_t{0xFF}) << 56) |
+ ((host_int & uint64_t{0xFF00}) << 40) |
+ ((host_int & uint64_t{0xFF0000}) << 24) |
+ ((host_int & uint64_t{0xFF000000}) << 8) |
+ ((host_int & uint64_t{0xFF00000000}) >> 8) |
+ ((host_int & uint64_t{0xFF0000000000}) >> 24) |
+ ((host_int & uint64_t{0xFF000000000000}) >> 40) |
+ ((host_int & uint64_t{0xFF00000000000000}) >> 56));
+#endif // bswap_64
+}
+
+inline uint32_t gbswap_32(uint32_t host_int) {
+#if defined(__GLIBC__)
+ return bswap_32(host_int);
+#else
+ return (((host_int & uint32_t{0xFF}) << 24) |
+ ((host_int & uint32_t{0xFF00}) << 8) |
+ ((host_int & uint32_t{0xFF0000}) >> 8) |
+ ((host_int & uint32_t{0xFF000000}) >> 24));
+#endif
+}
+
+inline uint16_t gbswap_16(uint16_t host_int) {
+#if defined(__GLIBC__)
+ return bswap_16(host_int);
+#else
+ return (((host_int & uint16_t{0xFF}) << 8) |
+ ((host_int & uint16_t{0xFF00}) >> 8));
+#endif
+}
+
+#endif // intrinsics available
+
+#ifdef ABSL_IS_LITTLE_ENDIAN
+
+// Definitions for ntohl etc. that don't require us to include
+// netinet/in.h. We wrap gbswap_32 and gbswap_16 in functions rather
+// than just #defining them because in debug mode, gcc doesn't
+// correctly handle the (rather involved) definitions of bswap_32.
+// gcc guarantees that inline functions are as fast as macros, so
+// this isn't a performance hit.
+inline uint16_t ghtons(uint16_t x) { return gbswap_16(x); }
+inline uint32_t ghtonl(uint32_t x) { return gbswap_32(x); }
+inline uint64_t ghtonll(uint64_t x) { return gbswap_64(x); }
+
+#elif defined ABSL_IS_BIG_ENDIAN
+
+// These definitions are simpler on big-endian machines
+// These are functions instead of macros to avoid self-assignment warnings
+// on calls such as "i = ghtnol(i);". This also provides type checking.
+inline uint16_t ghtons(uint16_t x) { return x; }
+inline uint32_t ghtonl(uint32_t x) { return x; }
+inline uint64_t ghtonll(uint64_t x) { return x; }
+
+#else
+#error \
+ "Unsupported byte order: Either ABSL_IS_BIG_ENDIAN or " \
+ "ABSL_IS_LITTLE_ENDIAN must be defined"
+#endif // byte order
+
+inline uint16_t gntohs(uint16_t x) { return ghtons(x); }
+inline uint32_t gntohl(uint32_t x) { return ghtonl(x); }
+inline uint64_t gntohll(uint64_t x) { return ghtonll(x); }
+
+// Utilities to convert numbers between the current hosts's native byte
+// order and little-endian byte order
+//
+// Load/Store methods are alignment safe
+namespace little_endian {
+// Conversion functions.
+#ifdef ABSL_IS_LITTLE_ENDIAN
+
+inline uint16_t FromHost16(uint16_t x) { return x; }
+inline uint16_t ToHost16(uint16_t x) { return x; }
+
+inline uint32_t FromHost32(uint32_t x) { return x; }
+inline uint32_t ToHost32(uint32_t x) { return x; }
+
+inline uint64_t FromHost64(uint64_t x) { return x; }
+inline uint64_t ToHost64(uint64_t x) { return x; }
+
+inline constexpr bool IsLittleEndian() { return true; }
+
+#elif defined ABSL_IS_BIG_ENDIAN
+
+inline uint16_t FromHost16(uint16_t x) { return gbswap_16(x); }
+inline uint16_t ToHost16(uint16_t x) { return gbswap_16(x); }
+
+inline uint32_t FromHost32(uint32_t x) { return gbswap_32(x); }
+inline uint32_t ToHost32(uint32_t x) { return gbswap_32(x); }
+
+inline uint64_t FromHost64(uint64_t x) { return gbswap_64(x); }
+inline uint64_t ToHost64(uint64_t x) { return gbswap_64(x); }
+
+inline constexpr bool IsLittleEndian() { return false; }
+
+#endif /* ENDIAN */
+
+// Functions to do unaligned loads and stores in little-endian order.
+inline uint16_t Load16(const void *p) {
+ return ToHost16(ABSL_INTERNAL_UNALIGNED_LOAD16(p));
+}
+
+inline void Store16(void *p, uint16_t v) {
+ ABSL_INTERNAL_UNALIGNED_STORE16(p, FromHost16(v));
+}
+
+inline uint32_t Load32(const void *p) {
+ return ToHost32(ABSL_INTERNAL_UNALIGNED_LOAD32(p));
+}
+
+inline void Store32(void *p, uint32_t v) {
+ ABSL_INTERNAL_UNALIGNED_STORE32(p, FromHost32(v));
+}
+
+inline uint64_t Load64(const void *p) {
+ return ToHost64(ABSL_INTERNAL_UNALIGNED_LOAD64(p));
+}
+
+inline void Store64(void *p, uint64_t v) {
+ ABSL_INTERNAL_UNALIGNED_STORE64(p, FromHost64(v));
+}
+
+} // namespace little_endian
+
+// Utilities to convert numbers between the current hosts's native byte
+// order and big-endian byte order (same as network byte order)
+//
+// Load/Store methods are alignment safe
+namespace big_endian {
+#ifdef ABSL_IS_LITTLE_ENDIAN
+
+inline uint16_t FromHost16(uint16_t x) { return gbswap_16(x); }
+inline uint16_t ToHost16(uint16_t x) { return gbswap_16(x); }
+
+inline uint32_t FromHost32(uint32_t x) { return gbswap_32(x); }
+inline uint32_t ToHost32(uint32_t x) { return gbswap_32(x); }
+
+inline uint64_t FromHost64(uint64_t x) { return gbswap_64(x); }
+inline uint64_t ToHost64(uint64_t x) { return gbswap_64(x); }
+
+inline constexpr bool IsLittleEndian() { return true; }
+
+#elif defined ABSL_IS_BIG_ENDIAN
+
+inline uint16_t FromHost16(uint16_t x) { return x; }
+inline uint16_t ToHost16(uint16_t x) { return x; }
+
+inline uint32_t FromHost32(uint32_t x) { return x; }
+inline uint32_t ToHost32(uint32_t x) { return x; }
+
+inline uint64_t FromHost64(uint64_t x) { return x; }
+inline uint64_t ToHost64(uint64_t x) { return x; }
+
+inline constexpr bool IsLittleEndian() { return false; }
+
+#endif /* ENDIAN */
+
+// Functions to do unaligned loads and stores in big-endian order.
+inline uint16_t Load16(const void *p) {
+ return ToHost16(ABSL_INTERNAL_UNALIGNED_LOAD16(p));
+}
+
+inline void Store16(void *p, uint16_t v) {
+ ABSL_INTERNAL_UNALIGNED_STORE16(p, FromHost16(v));
+}
+
+inline uint32_t Load32(const void *p) {
+ return ToHost32(ABSL_INTERNAL_UNALIGNED_LOAD32(p));
+}
+
+inline void Store32(void *p, uint32_t v) {
+ ABSL_INTERNAL_UNALIGNED_STORE32(p, FromHost32(v));
+}
+
+inline uint64_t Load64(const void *p) {
+ return ToHost64(ABSL_INTERNAL_UNALIGNED_LOAD64(p));
+}
+
+inline void Store64(void *p, uint64_t v) {
+ ABSL_INTERNAL_UNALIGNED_STORE64(p, FromHost64(v));
+}
+
+} // namespace big_endian
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_BASE_INTERNAL_ENDIAN_H_
diff --git a/third_party/abseil/src/absl/base/internal/endian_test.cc b/third_party/abseil/src/absl/base/internal/endian_test.cc
new file mode 100644
index 0000000..a1691b1
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/endian_test.cc
@@ -0,0 +1,263 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/base/internal/endian.h"
+
+#include <algorithm>
+#include <cstdint>
+#include <limits>
+#include <random>
+#include <vector>
+
+#include "gtest/gtest.h"
+#include "absl/base/config.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace {
+
+const uint64_t kInitialNumber{0x0123456789abcdef};
+const uint64_t k64Value{kInitialNumber};
+const uint32_t k32Value{0x01234567};
+const uint16_t k16Value{0x0123};
+const int kNumValuesToTest = 1000000;
+const int kRandomSeed = 12345;
+
+#if defined(ABSL_IS_BIG_ENDIAN)
+const uint64_t kInitialInNetworkOrder{kInitialNumber};
+const uint64_t k64ValueLE{0xefcdab8967452301};
+const uint32_t k32ValueLE{0x67452301};
+const uint16_t k16ValueLE{0x2301};
+
+const uint64_t k64ValueBE{kInitialNumber};
+const uint32_t k32ValueBE{k32Value};
+const uint16_t k16ValueBE{k16Value};
+#elif defined(ABSL_IS_LITTLE_ENDIAN)
+const uint64_t kInitialInNetworkOrder{0xefcdab8967452301};
+const uint64_t k64ValueLE{kInitialNumber};
+const uint32_t k32ValueLE{k32Value};
+const uint16_t k16ValueLE{k16Value};
+
+const uint64_t k64ValueBE{0xefcdab8967452301};
+const uint32_t k32ValueBE{0x67452301};
+const uint16_t k16ValueBE{0x2301};
+#endif
+
+std::vector<uint16_t> GenerateAllUint16Values() {
+ std::vector<uint16_t> result;
+ result.reserve(size_t{1} << (sizeof(uint16_t) * 8));
+ for (uint32_t i = std::numeric_limits<uint16_t>::min();
+ i <= std::numeric_limits<uint16_t>::max(); ++i) {
+ result.push_back(static_cast<uint16_t>(i));
+ }
+ return result;
+}
+
+template<typename T>
+std::vector<T> GenerateRandomIntegers(size_t num_values_to_test) {
+ std::vector<T> result;
+ result.reserve(num_values_to_test);
+ std::mt19937_64 rng(kRandomSeed);
+ for (size_t i = 0; i < num_values_to_test; ++i) {
+ result.push_back(rng());
+ }
+ return result;
+}
+
+void ManualByteSwap(char* bytes, int length) {
+ if (length == 1)
+ return;
+
+ EXPECT_EQ(0, length % 2);
+ for (int i = 0; i < length / 2; ++i) {
+ int j = (length - 1) - i;
+ using std::swap;
+ swap(bytes[i], bytes[j]);
+ }
+}
+
+template<typename T>
+inline T UnalignedLoad(const char* p) {
+ static_assert(
+ sizeof(T) == 1 || sizeof(T) == 2 || sizeof(T) == 4 || sizeof(T) == 8,
+ "Unexpected type size");
+
+ switch (sizeof(T)) {
+ case 1: return *reinterpret_cast<const T*>(p);
+ case 2:
+ return ABSL_INTERNAL_UNALIGNED_LOAD16(p);
+ case 4:
+ return ABSL_INTERNAL_UNALIGNED_LOAD32(p);
+ case 8:
+ return ABSL_INTERNAL_UNALIGNED_LOAD64(p);
+ default:
+ // Suppresses invalid "not all control paths return a value" on MSVC
+ return {};
+ }
+}
+
+template <typename T, typename ByteSwapper>
+static void GBSwapHelper(const std::vector<T>& host_values_to_test,
+ const ByteSwapper& byte_swapper) {
+ // Test byte_swapper against a manual byte swap.
+ for (typename std::vector<T>::const_iterator it = host_values_to_test.begin();
+ it != host_values_to_test.end(); ++it) {
+ T host_value = *it;
+
+ char actual_value[sizeof(host_value)];
+ memcpy(actual_value, &host_value, sizeof(host_value));
+ byte_swapper(actual_value);
+
+ char expected_value[sizeof(host_value)];
+ memcpy(expected_value, &host_value, sizeof(host_value));
+ ManualByteSwap(expected_value, sizeof(host_value));
+
+ ASSERT_EQ(0, memcmp(actual_value, expected_value, sizeof(host_value)))
+ << "Swap output for 0x" << std::hex << host_value << " does not match. "
+ << "Expected: 0x" << UnalignedLoad<T>(expected_value) << "; "
+ << "actual: 0x" << UnalignedLoad<T>(actual_value);
+ }
+}
+
+void Swap16(char* bytes) {
+ ABSL_INTERNAL_UNALIGNED_STORE16(
+ bytes, gbswap_16(ABSL_INTERNAL_UNALIGNED_LOAD16(bytes)));
+}
+
+void Swap32(char* bytes) {
+ ABSL_INTERNAL_UNALIGNED_STORE32(
+ bytes, gbswap_32(ABSL_INTERNAL_UNALIGNED_LOAD32(bytes)));
+}
+
+void Swap64(char* bytes) {
+ ABSL_INTERNAL_UNALIGNED_STORE64(
+ bytes, gbswap_64(ABSL_INTERNAL_UNALIGNED_LOAD64(bytes)));
+}
+
+TEST(EndianessTest, Uint16) {
+ GBSwapHelper(GenerateAllUint16Values(), &Swap16);
+}
+
+TEST(EndianessTest, Uint32) {
+ GBSwapHelper(GenerateRandomIntegers<uint32_t>(kNumValuesToTest), &Swap32);
+}
+
+TEST(EndianessTest, Uint64) {
+ GBSwapHelper(GenerateRandomIntegers<uint64_t>(kNumValuesToTest), &Swap64);
+}
+
+TEST(EndianessTest, ghtonll_gntohll) {
+ // Test that absl::ghtonl compiles correctly
+ uint32_t test = 0x01234567;
+ EXPECT_EQ(absl::gntohl(absl::ghtonl(test)), test);
+
+ uint64_t comp = absl::ghtonll(kInitialNumber);
+ EXPECT_EQ(comp, kInitialInNetworkOrder);
+ comp = absl::gntohll(kInitialInNetworkOrder);
+ EXPECT_EQ(comp, kInitialNumber);
+
+ // Test that htonll and ntohll are each others' inverse functions on a
+ // somewhat assorted batch of numbers. 37 is chosen to not be anything
+ // particularly nice base 2.
+ uint64_t value = 1;
+ for (int i = 0; i < 100; ++i) {
+ comp = absl::ghtonll(absl::gntohll(value));
+ EXPECT_EQ(value, comp);
+ comp = absl::gntohll(absl::ghtonll(value));
+ EXPECT_EQ(value, comp);
+ value *= 37;
+ }
+}
+
+TEST(EndianessTest, little_endian) {
+ // Check little_endian uint16_t.
+ uint64_t comp = little_endian::FromHost16(k16Value);
+ EXPECT_EQ(comp, k16ValueLE);
+ comp = little_endian::ToHost16(k16ValueLE);
+ EXPECT_EQ(comp, k16Value);
+
+ // Check little_endian uint32_t.
+ comp = little_endian::FromHost32(k32Value);
+ EXPECT_EQ(comp, k32ValueLE);
+ comp = little_endian::ToHost32(k32ValueLE);
+ EXPECT_EQ(comp, k32Value);
+
+ // Check little_endian uint64_t.
+ comp = little_endian::FromHost64(k64Value);
+ EXPECT_EQ(comp, k64ValueLE);
+ comp = little_endian::ToHost64(k64ValueLE);
+ EXPECT_EQ(comp, k64Value);
+
+ // Check little-endian Load and store functions.
+ uint16_t u16Buf;
+ uint32_t u32Buf;
+ uint64_t u64Buf;
+
+ little_endian::Store16(&u16Buf, k16Value);
+ EXPECT_EQ(u16Buf, k16ValueLE);
+ comp = little_endian::Load16(&u16Buf);
+ EXPECT_EQ(comp, k16Value);
+
+ little_endian::Store32(&u32Buf, k32Value);
+ EXPECT_EQ(u32Buf, k32ValueLE);
+ comp = little_endian::Load32(&u32Buf);
+ EXPECT_EQ(comp, k32Value);
+
+ little_endian::Store64(&u64Buf, k64Value);
+ EXPECT_EQ(u64Buf, k64ValueLE);
+ comp = little_endian::Load64(&u64Buf);
+ EXPECT_EQ(comp, k64Value);
+}
+
+TEST(EndianessTest, big_endian) {
+ // Check big-endian Load and store functions.
+ uint16_t u16Buf;
+ uint32_t u32Buf;
+ uint64_t u64Buf;
+
+ unsigned char buffer[10];
+ big_endian::Store16(&u16Buf, k16Value);
+ EXPECT_EQ(u16Buf, k16ValueBE);
+ uint64_t comp = big_endian::Load16(&u16Buf);
+ EXPECT_EQ(comp, k16Value);
+
+ big_endian::Store32(&u32Buf, k32Value);
+ EXPECT_EQ(u32Buf, k32ValueBE);
+ comp = big_endian::Load32(&u32Buf);
+ EXPECT_EQ(comp, k32Value);
+
+ big_endian::Store64(&u64Buf, k64Value);
+ EXPECT_EQ(u64Buf, k64ValueBE);
+ comp = big_endian::Load64(&u64Buf);
+ EXPECT_EQ(comp, k64Value);
+
+ big_endian::Store16(buffer + 1, k16Value);
+ EXPECT_EQ(u16Buf, k16ValueBE);
+ comp = big_endian::Load16(buffer + 1);
+ EXPECT_EQ(comp, k16Value);
+
+ big_endian::Store32(buffer + 1, k32Value);
+ EXPECT_EQ(u32Buf, k32ValueBE);
+ comp = big_endian::Load32(buffer + 1);
+ EXPECT_EQ(comp, k32Value);
+
+ big_endian::Store64(buffer + 1, k64Value);
+ EXPECT_EQ(u64Buf, k64ValueBE);
+ comp = big_endian::Load64(buffer + 1);
+ EXPECT_EQ(comp, k64Value);
+}
+
+} // namespace
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/base/internal/errno_saver.h b/third_party/abseil/src/absl/base/internal/errno_saver.h
new file mode 100644
index 0000000..251de51
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/errno_saver.h
@@ -0,0 +1,43 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_BASE_INTERNAL_ERRNO_SAVER_H_
+#define ABSL_BASE_INTERNAL_ERRNO_SAVER_H_
+
+#include <cerrno>
+
+#include "absl/base/config.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace base_internal {
+
+// `ErrnoSaver` captures the value of `errno` upon construction and restores it
+// upon deletion. It is used in low-level code and must be super fast. Do not
+// add instrumentation, even in debug modes.
+class ErrnoSaver {
+ public:
+ ErrnoSaver() : saved_errno_(errno) {}
+ ~ErrnoSaver() { errno = saved_errno_; }
+ int operator()() const { return saved_errno_; }
+
+ private:
+ const int saved_errno_;
+};
+
+} // namespace base_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_BASE_INTERNAL_ERRNO_SAVER_H_
diff --git a/third_party/abseil/src/absl/base/internal/errno_saver_test.cc b/third_party/abseil/src/absl/base/internal/errno_saver_test.cc
new file mode 100644
index 0000000..e9b742c
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/errno_saver_test.cc
@@ -0,0 +1,45 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/base/internal/errno_saver.h"
+
+#include <cerrno>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/base/internal/strerror.h"
+
+namespace {
+using ::testing::Eq;
+
+struct ErrnoPrinter {
+ int no;
+};
+std::ostream &operator<<(std::ostream &os, ErrnoPrinter ep) {
+ return os << absl::base_internal::StrError(ep.no) << " [" << ep.no << "]";
+}
+bool operator==(ErrnoPrinter one, ErrnoPrinter two) { return one.no == two.no; }
+
+TEST(ErrnoSaverTest, Works) {
+ errno = EDOM;
+ {
+ absl::base_internal::ErrnoSaver errno_saver;
+ EXPECT_THAT(ErrnoPrinter{errno}, Eq(ErrnoPrinter{EDOM}));
+ errno = ERANGE;
+ EXPECT_THAT(ErrnoPrinter{errno}, Eq(ErrnoPrinter{ERANGE}));
+ EXPECT_THAT(ErrnoPrinter{errno_saver()}, Eq(ErrnoPrinter{EDOM}));
+ }
+ EXPECT_THAT(ErrnoPrinter{errno}, Eq(ErrnoPrinter{EDOM}));
+}
+} // namespace
diff --git a/third_party/abseil/src/absl/base/internal/exception_safety_testing.cc b/third_party/abseil/src/absl/base/internal/exception_safety_testing.cc
new file mode 100644
index 0000000..6ccac41
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/exception_safety_testing.cc
@@ -0,0 +1,79 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/base/internal/exception_safety_testing.h"
+
+#ifdef ABSL_HAVE_EXCEPTIONS
+
+#include "gtest/gtest.h"
+#include "absl/meta/type_traits.h"
+
+namespace testing {
+
+exceptions_internal::NoThrowTag nothrow_ctor;
+
+exceptions_internal::StrongGuaranteeTagType strong_guarantee;
+
+exceptions_internal::ExceptionSafetyTestBuilder<> MakeExceptionSafetyTester() {
+ return {};
+}
+
+namespace exceptions_internal {
+
+int countdown = -1;
+
+ConstructorTracker* ConstructorTracker::current_tracker_instance_ = nullptr;
+
+void MaybeThrow(absl::string_view msg, bool throw_bad_alloc) {
+ if (countdown-- == 0) {
+ if (throw_bad_alloc) throw TestBadAllocException(msg);
+ throw TestException(msg);
+ }
+}
+
+testing::AssertionResult FailureMessage(const TestException& e,
+ int countdown) noexcept {
+ return testing::AssertionFailure() << "Exception thrown from " << e.what();
+}
+
+std::string GetSpecString(TypeSpec spec) {
+ std::string out;
+ absl::string_view sep;
+ const auto append = [&](absl::string_view s) {
+ absl::StrAppend(&out, sep, s);
+ sep = " | ";
+ };
+ if (static_cast<bool>(TypeSpec::kNoThrowCopy & spec)) {
+ append("kNoThrowCopy");
+ }
+ if (static_cast<bool>(TypeSpec::kNoThrowMove & spec)) {
+ append("kNoThrowMove");
+ }
+ if (static_cast<bool>(TypeSpec::kNoThrowNew & spec)) {
+ append("kNoThrowNew");
+ }
+ return out;
+}
+
+std::string GetSpecString(AllocSpec spec) {
+ return static_cast<bool>(AllocSpec::kNoThrowAllocate & spec)
+ ? "kNoThrowAllocate"
+ : "";
+}
+
+} // namespace exceptions_internal
+
+} // namespace testing
+
+#endif // ABSL_HAVE_EXCEPTIONS
diff --git a/third_party/abseil/src/absl/base/internal/exception_safety_testing.h b/third_party/abseil/src/absl/base/internal/exception_safety_testing.h
new file mode 100644
index 0000000..6ba89d0
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/exception_safety_testing.h
@@ -0,0 +1,1101 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Utilities for testing exception-safety
+
+#ifndef ABSL_BASE_INTERNAL_EXCEPTION_SAFETY_TESTING_H_
+#define ABSL_BASE_INTERNAL_EXCEPTION_SAFETY_TESTING_H_
+
+#include "absl/base/config.h"
+
+#ifdef ABSL_HAVE_EXCEPTIONS
+
+#include <cstddef>
+#include <cstdint>
+#include <functional>
+#include <initializer_list>
+#include <iosfwd>
+#include <string>
+#include <tuple>
+#include <unordered_map>
+
+#include "gtest/gtest.h"
+#include "absl/base/internal/pretty_function.h"
+#include "absl/memory/memory.h"
+#include "absl/meta/type_traits.h"
+#include "absl/strings/string_view.h"
+#include "absl/strings/substitute.h"
+#include "absl/utility/utility.h"
+
+namespace testing {
+
+enum class TypeSpec;
+enum class AllocSpec;
+
+constexpr TypeSpec operator|(TypeSpec a, TypeSpec b) {
+ using T = absl::underlying_type_t<TypeSpec>;
+ return static_cast<TypeSpec>(static_cast<T>(a) | static_cast<T>(b));
+}
+
+constexpr TypeSpec operator&(TypeSpec a, TypeSpec b) {
+ using T = absl::underlying_type_t<TypeSpec>;
+ return static_cast<TypeSpec>(static_cast<T>(a) & static_cast<T>(b));
+}
+
+constexpr AllocSpec operator|(AllocSpec a, AllocSpec b) {
+ using T = absl::underlying_type_t<AllocSpec>;
+ return static_cast<AllocSpec>(static_cast<T>(a) | static_cast<T>(b));
+}
+
+constexpr AllocSpec operator&(AllocSpec a, AllocSpec b) {
+ using T = absl::underlying_type_t<AllocSpec>;
+ return static_cast<AllocSpec>(static_cast<T>(a) & static_cast<T>(b));
+}
+
+namespace exceptions_internal {
+
+std::string GetSpecString(TypeSpec);
+std::string GetSpecString(AllocSpec);
+
+struct NoThrowTag {};
+struct StrongGuaranteeTagType {};
+
+// A simple exception class. We throw this so that test code can catch
+// exceptions specifically thrown by ThrowingValue.
+class TestException {
+ public:
+ explicit TestException(absl::string_view msg) : msg_(msg) {}
+ virtual ~TestException() {}
+ virtual const char* what() const noexcept { return msg_.c_str(); }
+
+ private:
+ std::string msg_;
+};
+
+// TestBadAllocException exists because allocation functions must throw an
+// exception which can be caught by a handler of std::bad_alloc. We use a child
+// class of std::bad_alloc so we can customise the error message, and also
+// derive from TestException so we don't accidentally end up catching an actual
+// bad_alloc exception in TestExceptionSafety.
+class TestBadAllocException : public std::bad_alloc, public TestException {
+ public:
+ explicit TestBadAllocException(absl::string_view msg) : TestException(msg) {}
+ using TestException::what;
+};
+
+extern int countdown;
+
+// Allows the countdown variable to be set manually (defaulting to the initial
+// value of 0)
+inline void SetCountdown(int i = 0) { countdown = i; }
+// Sets the countdown to the terminal value -1
+inline void UnsetCountdown() { SetCountdown(-1); }
+
+void MaybeThrow(absl::string_view msg, bool throw_bad_alloc = false);
+
+testing::AssertionResult FailureMessage(const TestException& e,
+ int countdown) noexcept;
+
+struct TrackedAddress {
+ bool is_alive;
+ std::string description;
+};
+
+// Inspects the constructions and destructions of anything inheriting from
+// TrackedObject. This allows us to safely "leak" TrackedObjects, as
+// ConstructorTracker will destroy everything left over in its destructor.
+class ConstructorTracker {
+ public:
+ explicit ConstructorTracker(int count) : countdown_(count) {
+ assert(current_tracker_instance_ == nullptr);
+ current_tracker_instance_ = this;
+ }
+
+ ~ConstructorTracker() {
+ assert(current_tracker_instance_ == this);
+ current_tracker_instance_ = nullptr;
+
+ for (auto& it : address_map_) {
+ void* address = it.first;
+ TrackedAddress& tracked_address = it.second;
+ if (tracked_address.is_alive) {
+ ADD_FAILURE() << ErrorMessage(address, tracked_address.description,
+ countdown_, "Object was not destroyed.");
+ }
+ }
+ }
+
+ static void ObjectConstructed(void* address, std::string description) {
+ if (!CurrentlyTracking()) return;
+
+ TrackedAddress& tracked_address =
+ current_tracker_instance_->address_map_[address];
+ if (tracked_address.is_alive) {
+ ADD_FAILURE() << ErrorMessage(
+ address, tracked_address.description,
+ current_tracker_instance_->countdown_,
+ "Object was re-constructed. Current object was constructed by " +
+ description);
+ }
+ tracked_address = {true, std::move(description)};
+ }
+
+ static void ObjectDestructed(void* address) {
+ if (!CurrentlyTracking()) return;
+
+ auto it = current_tracker_instance_->address_map_.find(address);
+ // Not tracked. Ignore.
+ if (it == current_tracker_instance_->address_map_.end()) return;
+
+ TrackedAddress& tracked_address = it->second;
+ if (!tracked_address.is_alive) {
+ ADD_FAILURE() << ErrorMessage(address, tracked_address.description,
+ current_tracker_instance_->countdown_,
+ "Object was re-destroyed.");
+ }
+ tracked_address.is_alive = false;
+ }
+
+ private:
+ static bool CurrentlyTracking() {
+ return current_tracker_instance_ != nullptr;
+ }
+
+ static std::string ErrorMessage(void* address,
+ const std::string& address_description,
+ int countdown,
+ const std::string& error_description) {
+ return absl::Substitute(
+ "With coundtown at $0:\n"
+ " $1\n"
+ " Object originally constructed by $2\n"
+ " Object address: $3\n",
+ countdown, error_description, address_description, address);
+ }
+
+ std::unordered_map<void*, TrackedAddress> address_map_;
+ int countdown_;
+
+ static ConstructorTracker* current_tracker_instance_;
+};
+
+class TrackedObject {
+ public:
+ TrackedObject(const TrackedObject&) = delete;
+ TrackedObject(TrackedObject&&) = delete;
+
+ protected:
+ explicit TrackedObject(std::string description) {
+ ConstructorTracker::ObjectConstructed(this, std::move(description));
+ }
+
+ ~TrackedObject() noexcept { ConstructorTracker::ObjectDestructed(this); }
+};
+} // namespace exceptions_internal
+
+extern exceptions_internal::NoThrowTag nothrow_ctor;
+
+extern exceptions_internal::StrongGuaranteeTagType strong_guarantee;
+
+// A test class which is convertible to bool. The conversion can be
+// instrumented to throw at a controlled time.
+class ThrowingBool {
+ public:
+ ThrowingBool(bool b) noexcept : b_(b) {} // NOLINT(runtime/explicit)
+ operator bool() const { // NOLINT
+ exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
+ return b_;
+ }
+
+ private:
+ bool b_;
+};
+
+/*
+ * Configuration enum for the ThrowingValue type that defines behavior for the
+ * lifetime of the instance. Use testing::nothrow_ctor to prevent the integer
+ * constructor from throwing.
+ *
+ * kEverythingThrows: Every operation can throw an exception
+ * kNoThrowCopy: Copy construction and copy assignment will not throw
+ * kNoThrowMove: Move construction and move assignment will not throw
+ * kNoThrowNew: Overloaded operators new and new[] will not throw
+ */
+enum class TypeSpec {
+ kEverythingThrows = 0,
+ kNoThrowCopy = 1,
+ kNoThrowMove = 1 << 1,
+ kNoThrowNew = 1 << 2,
+};
+
+/*
+ * A testing class instrumented to throw an exception at a controlled time.
+ *
+ * ThrowingValue implements a slightly relaxed version of the Regular concept --
+ * that is it's a value type with the expected semantics. It also implements
+ * arithmetic operations. It doesn't implement member and pointer operators
+ * like operator-> or operator[].
+ *
+ * ThrowingValue can be instrumented to have certain operations be noexcept by
+ * using compile-time bitfield template arguments. That is, to make an
+ * ThrowingValue which has noexcept move construction/assignment and noexcept
+ * copy construction/assignment, use the following:
+ * ThrowingValue<testing::kNoThrowMove | testing::kNoThrowCopy> my_thrwr{val};
+ */
+template <TypeSpec Spec = TypeSpec::kEverythingThrows>
+class ThrowingValue : private exceptions_internal::TrackedObject {
+ static constexpr bool IsSpecified(TypeSpec spec) {
+ return static_cast<bool>(Spec & spec);
+ }
+
+ static constexpr int kDefaultValue = 0;
+ static constexpr int kBadValue = 938550620;
+
+ public:
+ ThrowingValue() : TrackedObject(GetInstanceString(kDefaultValue)) {
+ exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
+ dummy_ = kDefaultValue;
+ }
+
+ ThrowingValue(const ThrowingValue& other) noexcept(
+ IsSpecified(TypeSpec::kNoThrowCopy))
+ : TrackedObject(GetInstanceString(other.dummy_)) {
+ if (!IsSpecified(TypeSpec::kNoThrowCopy)) {
+ exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
+ }
+ dummy_ = other.dummy_;
+ }
+
+ ThrowingValue(ThrowingValue&& other) noexcept(
+ IsSpecified(TypeSpec::kNoThrowMove))
+ : TrackedObject(GetInstanceString(other.dummy_)) {
+ if (!IsSpecified(TypeSpec::kNoThrowMove)) {
+ exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
+ }
+ dummy_ = other.dummy_;
+ }
+
+ explicit ThrowingValue(int i) : TrackedObject(GetInstanceString(i)) {
+ exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
+ dummy_ = i;
+ }
+
+ ThrowingValue(int i, exceptions_internal::NoThrowTag) noexcept
+ : TrackedObject(GetInstanceString(i)), dummy_(i) {}
+
+ // absl expects nothrow destructors
+ ~ThrowingValue() noexcept = default;
+
+ ThrowingValue& operator=(const ThrowingValue& other) noexcept(
+ IsSpecified(TypeSpec::kNoThrowCopy)) {
+ dummy_ = kBadValue;
+ if (!IsSpecified(TypeSpec::kNoThrowCopy)) {
+ exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
+ }
+ dummy_ = other.dummy_;
+ return *this;
+ }
+
+ ThrowingValue& operator=(ThrowingValue&& other) noexcept(
+ IsSpecified(TypeSpec::kNoThrowMove)) {
+ dummy_ = kBadValue;
+ if (!IsSpecified(TypeSpec::kNoThrowMove)) {
+ exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
+ }
+ dummy_ = other.dummy_;
+ return *this;
+ }
+
+ // Arithmetic Operators
+ ThrowingValue operator+(const ThrowingValue& other) const {
+ exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
+ return ThrowingValue(dummy_ + other.dummy_, nothrow_ctor);
+ }
+
+ ThrowingValue operator+() const {
+ exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
+ return ThrowingValue(dummy_, nothrow_ctor);
+ }
+
+ ThrowingValue operator-(const ThrowingValue& other) const {
+ exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
+ return ThrowingValue(dummy_ - other.dummy_, nothrow_ctor);
+ }
+
+ ThrowingValue operator-() const {
+ exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
+ return ThrowingValue(-dummy_, nothrow_ctor);
+ }
+
+ ThrowingValue& operator++() {
+ exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
+ ++dummy_;
+ return *this;
+ }
+
+ ThrowingValue operator++(int) {
+ exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
+ auto out = ThrowingValue(dummy_, nothrow_ctor);
+ ++dummy_;
+ return out;
+ }
+
+ ThrowingValue& operator--() {
+ exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
+ --dummy_;
+ return *this;
+ }
+
+ ThrowingValue operator--(int) {
+ exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
+ auto out = ThrowingValue(dummy_, nothrow_ctor);
+ --dummy_;
+ return out;
+ }
+
+ ThrowingValue operator*(const ThrowingValue& other) const {
+ exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
+ return ThrowingValue(dummy_ * other.dummy_, nothrow_ctor);
+ }
+
+ ThrowingValue operator/(const ThrowingValue& other) const {
+ exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
+ return ThrowingValue(dummy_ / other.dummy_, nothrow_ctor);
+ }
+
+ ThrowingValue operator%(const ThrowingValue& other) const {
+ exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
+ return ThrowingValue(dummy_ % other.dummy_, nothrow_ctor);
+ }
+
+ ThrowingValue operator<<(int shift) const {
+ exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
+ return ThrowingValue(dummy_ << shift, nothrow_ctor);
+ }
+
+ ThrowingValue operator>>(int shift) const {
+ exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
+ return ThrowingValue(dummy_ >> shift, nothrow_ctor);
+ }
+
+ // Comparison Operators
+ // NOTE: We use `ThrowingBool` instead of `bool` because most STL
+ // types/containers requires T to be convertible to bool.
+ friend ThrowingBool operator==(const ThrowingValue& a,
+ const ThrowingValue& b) {
+ exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
+ return a.dummy_ == b.dummy_;
+ }
+ friend ThrowingBool operator!=(const ThrowingValue& a,
+ const ThrowingValue& b) {
+ exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
+ return a.dummy_ != b.dummy_;
+ }
+ friend ThrowingBool operator<(const ThrowingValue& a,
+ const ThrowingValue& b) {
+ exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
+ return a.dummy_ < b.dummy_;
+ }
+ friend ThrowingBool operator<=(const ThrowingValue& a,
+ const ThrowingValue& b) {
+ exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
+ return a.dummy_ <= b.dummy_;
+ }
+ friend ThrowingBool operator>(const ThrowingValue& a,
+ const ThrowingValue& b) {
+ exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
+ return a.dummy_ > b.dummy_;
+ }
+ friend ThrowingBool operator>=(const ThrowingValue& a,
+ const ThrowingValue& b) {
+ exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
+ return a.dummy_ >= b.dummy_;
+ }
+
+ // Logical Operators
+ ThrowingBool operator!() const {
+ exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
+ return !dummy_;
+ }
+
+ ThrowingBool operator&&(const ThrowingValue& other) const {
+ exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
+ return dummy_ && other.dummy_;
+ }
+
+ ThrowingBool operator||(const ThrowingValue& other) const {
+ exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
+ return dummy_ || other.dummy_;
+ }
+
+ // Bitwise Logical Operators
+ ThrowingValue operator~() const {
+ exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
+ return ThrowingValue(~dummy_, nothrow_ctor);
+ }
+
+ ThrowingValue operator&(const ThrowingValue& other) const {
+ exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
+ return ThrowingValue(dummy_ & other.dummy_, nothrow_ctor);
+ }
+
+ ThrowingValue operator|(const ThrowingValue& other) const {
+ exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
+ return ThrowingValue(dummy_ | other.dummy_, nothrow_ctor);
+ }
+
+ ThrowingValue operator^(const ThrowingValue& other) const {
+ exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
+ return ThrowingValue(dummy_ ^ other.dummy_, nothrow_ctor);
+ }
+
+ // Compound Assignment operators
+ ThrowingValue& operator+=(const ThrowingValue& other) {
+ exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
+ dummy_ += other.dummy_;
+ return *this;
+ }
+
+ ThrowingValue& operator-=(const ThrowingValue& other) {
+ exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
+ dummy_ -= other.dummy_;
+ return *this;
+ }
+
+ ThrowingValue& operator*=(const ThrowingValue& other) {
+ exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
+ dummy_ *= other.dummy_;
+ return *this;
+ }
+
+ ThrowingValue& operator/=(const ThrowingValue& other) {
+ exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
+ dummy_ /= other.dummy_;
+ return *this;
+ }
+
+ ThrowingValue& operator%=(const ThrowingValue& other) {
+ exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
+ dummy_ %= other.dummy_;
+ return *this;
+ }
+
+ ThrowingValue& operator&=(const ThrowingValue& other) {
+ exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
+ dummy_ &= other.dummy_;
+ return *this;
+ }
+
+ ThrowingValue& operator|=(const ThrowingValue& other) {
+ exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
+ dummy_ |= other.dummy_;
+ return *this;
+ }
+
+ ThrowingValue& operator^=(const ThrowingValue& other) {
+ exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
+ dummy_ ^= other.dummy_;
+ return *this;
+ }
+
+ ThrowingValue& operator<<=(int shift) {
+ exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
+ dummy_ <<= shift;
+ return *this;
+ }
+
+ ThrowingValue& operator>>=(int shift) {
+ exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
+ dummy_ >>= shift;
+ return *this;
+ }
+
+ // Pointer operators
+ void operator&() const = delete; // NOLINT(runtime/operator)
+
+ // Stream operators
+ friend std::ostream& operator<<(std::ostream& os, const ThrowingValue& tv) {
+ exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
+ return os << GetInstanceString(tv.dummy_);
+ }
+
+ friend std::istream& operator>>(std::istream& is, const ThrowingValue&) {
+ exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
+ return is;
+ }
+
+ // Memory management operators
+ // Args.. allows us to overload regular and placement new in one shot
+ template <typename... Args>
+ static void* operator new(size_t s, Args&&... args) noexcept(
+ IsSpecified(TypeSpec::kNoThrowNew)) {
+ if (!IsSpecified(TypeSpec::kNoThrowNew)) {
+ exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION, true);
+ }
+ return ::operator new(s, std::forward<Args>(args)...);
+ }
+
+ template <typename... Args>
+ static void* operator new[](size_t s, Args&&... args) noexcept(
+ IsSpecified(TypeSpec::kNoThrowNew)) {
+ if (!IsSpecified(TypeSpec::kNoThrowNew)) {
+ exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION, true);
+ }
+ return ::operator new[](s, std::forward<Args>(args)...);
+ }
+
+ // Abseil doesn't support throwing overloaded operator delete. These are
+ // provided so a throwing operator-new can clean up after itself.
+ //
+ // We provide both regular and templated operator delete because if only the
+ // templated version is provided as we did with operator new, the compiler has
+ // no way of knowing which overload of operator delete to call. See
+ // https://en.cppreference.com/w/cpp/memory/new/operator_delete and
+ // https://en.cppreference.com/w/cpp/language/delete for the gory details.
+ void operator delete(void* p) noexcept { ::operator delete(p); }
+
+ template <typename... Args>
+ void operator delete(void* p, Args&&... args) noexcept {
+ ::operator delete(p, std::forward<Args>(args)...);
+ }
+
+ void operator delete[](void* p) noexcept { return ::operator delete[](p); }
+
+ template <typename... Args>
+ void operator delete[](void* p, Args&&... args) noexcept {
+ return ::operator delete[](p, std::forward<Args>(args)...);
+ }
+
+ // Non-standard access to the actual contained value. No need for this to
+ // throw.
+ int& Get() noexcept { return dummy_; }
+ const int& Get() const noexcept { return dummy_; }
+
+ private:
+ static std::string GetInstanceString(int dummy) {
+ return absl::StrCat("ThrowingValue<",
+ exceptions_internal::GetSpecString(Spec), ">(", dummy,
+ ")");
+ }
+
+ int dummy_;
+};
+// While not having to do with exceptions, explicitly delete comma operator, to
+// make sure we don't use it on user-supplied types.
+template <TypeSpec Spec, typename T>
+void operator,(const ThrowingValue<Spec>&, T&&) = delete;
+template <TypeSpec Spec, typename T>
+void operator,(T&&, const ThrowingValue<Spec>&) = delete;
+
+/*
+ * Configuration enum for the ThrowingAllocator type that defines behavior for
+ * the lifetime of the instance.
+ *
+ * kEverythingThrows: Calls to the member functions may throw
+ * kNoThrowAllocate: Calls to the member functions will not throw
+ */
+enum class AllocSpec {
+ kEverythingThrows = 0,
+ kNoThrowAllocate = 1,
+};
+
+/*
+ * An allocator type which is instrumented to throw at a controlled time, or not
+ * to throw, using AllocSpec. The supported settings are the default of every
+ * function which is allowed to throw in a conforming allocator possibly
+ * throwing, or nothing throws, in line with the ABSL_ALLOCATOR_THROWS
+ * configuration macro.
+ */
+template <typename T, AllocSpec Spec = AllocSpec::kEverythingThrows>
+class ThrowingAllocator : private exceptions_internal::TrackedObject {
+ static constexpr bool IsSpecified(AllocSpec spec) {
+ return static_cast<bool>(Spec & spec);
+ }
+
+ public:
+ using pointer = T*;
+ using const_pointer = const T*;
+ using reference = T&;
+ using const_reference = const T&;
+ using void_pointer = void*;
+ using const_void_pointer = const void*;
+ using value_type = T;
+ using size_type = size_t;
+ using difference_type = ptrdiff_t;
+
+ using is_nothrow =
+ std::integral_constant<bool, Spec == AllocSpec::kNoThrowAllocate>;
+ using propagate_on_container_copy_assignment = std::true_type;
+ using propagate_on_container_move_assignment = std::true_type;
+ using propagate_on_container_swap = std::true_type;
+ using is_always_equal = std::false_type;
+
+ ThrowingAllocator() : TrackedObject(GetInstanceString(next_id_)) {
+ exceptions_internal::MaybeThrow(ABSL_PRETTY_FUNCTION);
+ dummy_ = std::make_shared<const int>(next_id_++);
+ }
+
+ template <typename U>
+ ThrowingAllocator(const ThrowingAllocator<U, Spec>& other) noexcept // NOLINT
+ : TrackedObject(GetInstanceString(*other.State())),
+ dummy_(other.State()) {}
+
+ // According to C++11 standard [17.6.3.5], Table 28, the move/copy ctors of
+ // allocator shall not exit via an exception, thus they are marked noexcept.
+ ThrowingAllocator(const ThrowingAllocator& other) noexcept
+ : TrackedObject(GetInstanceString(*other.State())),
+ dummy_(other.State()) {}
+
+ template <typename U>
+ ThrowingAllocator(ThrowingAllocator<U, Spec>&& other) noexcept // NOLINT
+ : TrackedObject(GetInstanceString(*other.State())),
+ dummy_(std::move(other.State())) {}
+
+ ThrowingAllocator(ThrowingAllocator&& other) noexcept
+ : TrackedObject(GetInstanceString(*other.State())),
+ dummy_(std::move(other.State())) {}
+
+ ~ThrowingAllocator() noexcept = default;
+
+ ThrowingAllocator& operator=(const ThrowingAllocator& other) noexcept {
+ dummy_ = other.State();
+ return *this;
+ }
+
+ template <typename U>
+ ThrowingAllocator& operator=(
+ const ThrowingAllocator<U, Spec>& other) noexcept {
+ dummy_ = other.State();
+ return *this;
+ }
+
+ template <typename U>
+ ThrowingAllocator& operator=(ThrowingAllocator<U, Spec>&& other) noexcept {
+ dummy_ = std::move(other.State());
+ return *this;
+ }
+
+ template <typename U>
+ struct rebind {
+ using other = ThrowingAllocator<U, Spec>;
+ };
+
+ pointer allocate(size_type n) noexcept(
+ IsSpecified(AllocSpec::kNoThrowAllocate)) {
+ ReadStateAndMaybeThrow(ABSL_PRETTY_FUNCTION);
+ return static_cast<pointer>(::operator new(n * sizeof(T)));
+ }
+
+ pointer allocate(size_type n, const_void_pointer) noexcept(
+ IsSpecified(AllocSpec::kNoThrowAllocate)) {
+ return allocate(n);
+ }
+
+ void deallocate(pointer ptr, size_type) noexcept {
+ ReadState();
+ ::operator delete(static_cast<void*>(ptr));
+ }
+
+ template <typename U, typename... Args>
+ void construct(U* ptr, Args&&... args) noexcept(
+ IsSpecified(AllocSpec::kNoThrowAllocate)) {
+ ReadStateAndMaybeThrow(ABSL_PRETTY_FUNCTION);
+ ::new (static_cast<void*>(ptr)) U(std::forward<Args>(args)...);
+ }
+
+ template <typename U>
+ void destroy(U* p) noexcept {
+ ReadState();
+ p->~U();
+ }
+
+ size_type max_size() const noexcept {
+ return (std::numeric_limits<difference_type>::max)() / sizeof(value_type);
+ }
+
+ ThrowingAllocator select_on_container_copy_construction() noexcept(
+ IsSpecified(AllocSpec::kNoThrowAllocate)) {
+ auto& out = *this;
+ ReadStateAndMaybeThrow(ABSL_PRETTY_FUNCTION);
+ return out;
+ }
+
+ template <typename U>
+ bool operator==(const ThrowingAllocator<U, Spec>& other) const noexcept {
+ return dummy_ == other.dummy_;
+ }
+
+ template <typename U>
+ bool operator!=(const ThrowingAllocator<U, Spec>& other) const noexcept {
+ return dummy_ != other.dummy_;
+ }
+
+ template <typename, AllocSpec>
+ friend class ThrowingAllocator;
+
+ private:
+ static std::string GetInstanceString(int dummy) {
+ return absl::StrCat("ThrowingAllocator<",
+ exceptions_internal::GetSpecString(Spec), ">(", dummy,
+ ")");
+ }
+
+ const std::shared_ptr<const int>& State() const { return dummy_; }
+ std::shared_ptr<const int>& State() { return dummy_; }
+
+ void ReadState() {
+ // we know that this will never be true, but the compiler doesn't, so this
+ // should safely force a read of the value.
+ if (*dummy_ < 0) std::abort();
+ }
+
+ void ReadStateAndMaybeThrow(absl::string_view msg) const {
+ if (!IsSpecified(AllocSpec::kNoThrowAllocate)) {
+ exceptions_internal::MaybeThrow(
+ absl::Substitute("Allocator id $0 threw from $1", *dummy_, msg));
+ }
+ }
+
+ static int next_id_;
+ std::shared_ptr<const int> dummy_;
+};
+
+template <typename T, AllocSpec Spec>
+int ThrowingAllocator<T, Spec>::next_id_ = 0;
+
+// Tests for resource leaks by attempting to construct a T using args repeatedly
+// until successful, using the countdown method. Side effects can then be
+// tested for resource leaks.
+template <typename T, typename... Args>
+void TestThrowingCtor(Args&&... args) {
+ struct Cleanup {
+ ~Cleanup() { exceptions_internal::UnsetCountdown(); }
+ } c;
+ for (int count = 0;; ++count) {
+ exceptions_internal::ConstructorTracker ct(count);
+ exceptions_internal::SetCountdown(count);
+ try {
+ T temp(std::forward<Args>(args)...);
+ static_cast<void>(temp);
+ break;
+ } catch (const exceptions_internal::TestException&) {
+ }
+ }
+}
+
+// Tests the nothrow guarantee of the provided nullary operation. If the an
+// exception is thrown, the result will be AssertionFailure(). Otherwise, it
+// will be AssertionSuccess().
+template <typename Operation>
+testing::AssertionResult TestNothrowOp(const Operation& operation) {
+ struct Cleanup {
+ Cleanup() { exceptions_internal::SetCountdown(); }
+ ~Cleanup() { exceptions_internal::UnsetCountdown(); }
+ } c;
+ try {
+ operation();
+ return testing::AssertionSuccess();
+ } catch (const exceptions_internal::TestException&) {
+ return testing::AssertionFailure()
+ << "TestException thrown during call to operation() when nothrow "
+ "guarantee was expected.";
+ } catch (...) {
+ return testing::AssertionFailure()
+ << "Unknown exception thrown during call to operation() when "
+ "nothrow guarantee was expected.";
+ }
+}
+
+namespace exceptions_internal {
+
+// Dummy struct for ExceptionSafetyTestBuilder<> partial state.
+struct UninitializedT {};
+
+template <typename T>
+class DefaultFactory {
+ public:
+ explicit DefaultFactory(const T& t) : t_(t) {}
+ std::unique_ptr<T> operator()() const { return absl::make_unique<T>(t_); }
+
+ private:
+ T t_;
+};
+
+template <size_t LazyContractsCount, typename LazyFactory,
+ typename LazyOperation>
+using EnableIfTestable = typename absl::enable_if_t<
+ LazyContractsCount != 0 &&
+ !std::is_same<LazyFactory, UninitializedT>::value &&
+ !std::is_same<LazyOperation, UninitializedT>::value>;
+
+template <typename Factory = UninitializedT,
+ typename Operation = UninitializedT, typename... Contracts>
+class ExceptionSafetyTestBuilder;
+
+} // namespace exceptions_internal
+
+/*
+ * Constructs an empty ExceptionSafetyTestBuilder. All
+ * ExceptionSafetyTestBuilder objects are immutable and all With[thing] mutation
+ * methods return new instances of ExceptionSafetyTestBuilder.
+ *
+ * In order to test a T for exception safety, a factory for that T, a testable
+ * operation, and at least one contract callback returning an assertion
+ * result must be applied using the respective methods.
+ */
+exceptions_internal::ExceptionSafetyTestBuilder<> MakeExceptionSafetyTester();
+
+namespace exceptions_internal {
+template <typename T>
+struct IsUniquePtr : std::false_type {};
+
+template <typename T, typename D>
+struct IsUniquePtr<std::unique_ptr<T, D>> : std::true_type {};
+
+template <typename Factory>
+struct FactoryPtrTypeHelper {
+ using type = decltype(std::declval<const Factory&>()());
+
+ static_assert(IsUniquePtr<type>::value, "Factories must return a unique_ptr");
+};
+
+template <typename Factory>
+using FactoryPtrType = typename FactoryPtrTypeHelper<Factory>::type;
+
+template <typename Factory>
+using FactoryElementType = typename FactoryPtrType<Factory>::element_type;
+
+template <typename T>
+class ExceptionSafetyTest {
+ using Factory = std::function<std::unique_ptr<T>()>;
+ using Operation = std::function<void(T*)>;
+ using Contract = std::function<AssertionResult(T*)>;
+
+ public:
+ template <typename... Contracts>
+ explicit ExceptionSafetyTest(const Factory& f, const Operation& op,
+ const Contracts&... contracts)
+ : factory_(f), operation_(op), contracts_{WrapContract(contracts)...} {}
+
+ AssertionResult Test() const {
+ for (int count = 0;; ++count) {
+ exceptions_internal::ConstructorTracker ct(count);
+
+ for (const auto& contract : contracts_) {
+ auto t_ptr = factory_();
+ try {
+ SetCountdown(count);
+ operation_(t_ptr.get());
+ // Unset for the case that the operation throws no exceptions, which
+ // would leave the countdown set and break the *next* exception safety
+ // test after this one.
+ UnsetCountdown();
+ return AssertionSuccess();
+ } catch (const exceptions_internal::TestException& e) {
+ if (!contract(t_ptr.get())) {
+ return AssertionFailure() << e.what() << " failed contract check";
+ }
+ }
+ }
+ }
+ }
+
+ private:
+ template <typename ContractFn>
+ Contract WrapContract(const ContractFn& contract) {
+ return [contract](T* t_ptr) { return AssertionResult(contract(t_ptr)); };
+ }
+
+ Contract WrapContract(StrongGuaranteeTagType) {
+ return [this](T* t_ptr) { return AssertionResult(*factory_() == *t_ptr); };
+ }
+
+ Factory factory_;
+ Operation operation_;
+ std::vector<Contract> contracts_;
+};
+
+/*
+ * Builds a tester object that tests if performing a operation on a T follows
+ * exception safety guarantees. Verification is done via contract assertion
+ * callbacks applied to T instances post-throw.
+ *
+ * Template parameters for ExceptionSafetyTestBuilder:
+ *
+ * - Factory: The factory object (passed in via tester.WithFactory(...) or
+ * tester.WithInitialValue(...)) must be invocable with the signature
+ * `std::unique_ptr<T> operator()() const` where T is the type being tested.
+ * It is used for reliably creating identical T instances to test on.
+ *
+ * - Operation: The operation object (passsed in via tester.WithOperation(...)
+ * or tester.Test(...)) must be invocable with the signature
+ * `void operator()(T*) const` where T is the type being tested. It is used
+ * for performing steps on a T instance that may throw and that need to be
+ * checked for exception safety. Each call to the operation will receive a
+ * fresh T instance so it's free to modify and destroy the T instances as it
+ * pleases.
+ *
+ * - Contracts...: The contract assertion callback objects (passed in via
+ * tester.WithContracts(...)) must be invocable with the signature
+ * `testing::AssertionResult operator()(T*) const` where T is the type being
+ * tested. Contract assertion callbacks are provided T instances post-throw.
+ * They must return testing::AssertionSuccess when the type contracts of the
+ * provided T instance hold. If the type contracts of the T instance do not
+ * hold, they must return testing::AssertionFailure. Execution order of
+ * Contracts... is unspecified. They will each individually get a fresh T
+ * instance so they are free to modify and destroy the T instances as they
+ * please.
+ */
+template <typename Factory, typename Operation, typename... Contracts>
+class ExceptionSafetyTestBuilder {
+ public:
+ /*
+ * Returns a new ExceptionSafetyTestBuilder with an included T factory based
+ * on the provided T instance. The existing factory will not be included in
+ * the newly created tester instance. The created factory returns a new T
+ * instance by copy-constructing the provided const T& t.
+ *
+ * Preconditions for tester.WithInitialValue(const T& t):
+ *
+ * - The const T& t object must be copy-constructible where T is the type
+ * being tested. For non-copy-constructible objects, use the method
+ * tester.WithFactory(...).
+ */
+ template <typename T>
+ ExceptionSafetyTestBuilder<DefaultFactory<T>, Operation, Contracts...>
+ WithInitialValue(const T& t) const {
+ return WithFactory(DefaultFactory<T>(t));
+ }
+
+ /*
+ * Returns a new ExceptionSafetyTestBuilder with the provided T factory
+ * included. The existing factory will not be included in the newly-created
+ * tester instance. This method is intended for use with types lacking a copy
+ * constructor. Types that can be copy-constructed should instead use the
+ * method tester.WithInitialValue(...).
+ */
+ template <typename NewFactory>
+ ExceptionSafetyTestBuilder<absl::decay_t<NewFactory>, Operation, Contracts...>
+ WithFactory(const NewFactory& new_factory) const {
+ return {new_factory, operation_, contracts_};
+ }
+
+ /*
+ * Returns a new ExceptionSafetyTestBuilder with the provided testable
+ * operation included. The existing operation will not be included in the
+ * newly created tester.
+ */
+ template <typename NewOperation>
+ ExceptionSafetyTestBuilder<Factory, absl::decay_t<NewOperation>, Contracts...>
+ WithOperation(const NewOperation& new_operation) const {
+ return {factory_, new_operation, contracts_};
+ }
+
+ /*
+ * Returns a new ExceptionSafetyTestBuilder with the provided MoreContracts...
+ * combined with the Contracts... that were already included in the instance
+ * on which the method was called. Contracts... cannot be removed or replaced
+ * once added to an ExceptionSafetyTestBuilder instance. A fresh object must
+ * be created in order to get an empty Contracts... list.
+ *
+ * In addition to passing in custom contract assertion callbacks, this method
+ * accepts `testing::strong_guarantee` as an argument which checks T instances
+ * post-throw against freshly created T instances via operator== to verify
+ * that any state changes made during the execution of the operation were
+ * properly rolled back.
+ */
+ template <typename... MoreContracts>
+ ExceptionSafetyTestBuilder<Factory, Operation, Contracts...,
+ absl::decay_t<MoreContracts>...>
+ WithContracts(const MoreContracts&... more_contracts) const {
+ return {
+ factory_, operation_,
+ std::tuple_cat(contracts_, std::tuple<absl::decay_t<MoreContracts>...>(
+ more_contracts...))};
+ }
+
+ /*
+ * Returns a testing::AssertionResult that is the reduced result of the
+ * exception safety algorithm. The algorithm short circuits and returns
+ * AssertionFailure after the first contract callback returns an
+ * AssertionFailure. Otherwise, if all contract callbacks return an
+ * AssertionSuccess, the reduced result is AssertionSuccess.
+ *
+ * The passed-in testable operation will not be saved in a new tester instance
+ * nor will it modify/replace the existing tester instance. This is useful
+ * when each operation being tested is unique and does not need to be reused.
+ *
+ * Preconditions for tester.Test(const NewOperation& new_operation):
+ *
+ * - May only be called after at least one contract assertion callback and a
+ * factory or initial value have been provided.
+ */
+ template <
+ typename NewOperation,
+ typename = EnableIfTestable<sizeof...(Contracts), Factory, NewOperation>>
+ testing::AssertionResult Test(const NewOperation& new_operation) const {
+ return TestImpl(new_operation, absl::index_sequence_for<Contracts...>());
+ }
+
+ /*
+ * Returns a testing::AssertionResult that is the reduced result of the
+ * exception safety algorithm. The algorithm short circuits and returns
+ * AssertionFailure after the first contract callback returns an
+ * AssertionFailure. Otherwise, if all contract callbacks return an
+ * AssertionSuccess, the reduced result is AssertionSuccess.
+ *
+ * Preconditions for tester.Test():
+ *
+ * - May only be called after at least one contract assertion callback, a
+ * factory or initial value and a testable operation have been provided.
+ */
+ template <
+ typename LazyOperation = Operation,
+ typename = EnableIfTestable<sizeof...(Contracts), Factory, LazyOperation>>
+ testing::AssertionResult Test() const {
+ return Test(operation_);
+ }
+
+ private:
+ template <typename, typename, typename...>
+ friend class ExceptionSafetyTestBuilder;
+
+ friend ExceptionSafetyTestBuilder<> testing::MakeExceptionSafetyTester();
+
+ ExceptionSafetyTestBuilder() {}
+
+ ExceptionSafetyTestBuilder(const Factory& f, const Operation& o,
+ const std::tuple<Contracts...>& i)
+ : factory_(f), operation_(o), contracts_(i) {}
+
+ template <typename SelectedOperation, size_t... Indices>
+ testing::AssertionResult TestImpl(SelectedOperation selected_operation,
+ absl::index_sequence<Indices...>) const {
+ return ExceptionSafetyTest<FactoryElementType<Factory>>(
+ factory_, selected_operation, std::get<Indices>(contracts_)...)
+ .Test();
+ }
+
+ Factory factory_;
+ Operation operation_;
+ std::tuple<Contracts...> contracts_;
+};
+
+} // namespace exceptions_internal
+
+} // namespace testing
+
+#endif // ABSL_HAVE_EXCEPTIONS
+
+#endif // ABSL_BASE_INTERNAL_EXCEPTION_SAFETY_TESTING_H_
diff --git a/third_party/abseil/src/absl/base/internal/exception_testing.h b/third_party/abseil/src/absl/base/internal/exception_testing.h
new file mode 100644
index 0000000..01b5465
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/exception_testing.h
@@ -0,0 +1,42 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Testing utilities for ABSL types which throw exceptions.
+
+#ifndef ABSL_BASE_INTERNAL_EXCEPTION_TESTING_H_
+#define ABSL_BASE_INTERNAL_EXCEPTION_TESTING_H_
+
+#include "gtest/gtest.h"
+#include "absl/base/config.h"
+
+// ABSL_BASE_INTERNAL_EXPECT_FAIL tests either for a specified thrown exception
+// if exceptions are enabled, or for death with a specified text in the error
+// message
+#ifdef ABSL_HAVE_EXCEPTIONS
+
+#define ABSL_BASE_INTERNAL_EXPECT_FAIL(expr, exception_t, text) \
+ EXPECT_THROW(expr, exception_t)
+
+#elif defined(__ANDROID__)
+// Android asserts do not log anywhere that gtest can currently inspect.
+// So we expect exit, but cannot match the message.
+#define ABSL_BASE_INTERNAL_EXPECT_FAIL(expr, exception_t, text) \
+ EXPECT_DEATH(expr, ".*")
+#else
+#define ABSL_BASE_INTERNAL_EXPECT_FAIL(expr, exception_t, text) \
+ EXPECT_DEATH_IF_SUPPORTED(expr, text)
+
+#endif
+
+#endif // ABSL_BASE_INTERNAL_EXCEPTION_TESTING_H_
diff --git a/third_party/abseil/src/absl/base/internal/exponential_biased.cc b/third_party/abseil/src/absl/base/internal/exponential_biased.cc
new file mode 100644
index 0000000..1b30c06
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/exponential_biased.cc
@@ -0,0 +1,93 @@
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/base/internal/exponential_biased.h"
+
+#include <stdint.h>
+
+#include <algorithm>
+#include <atomic>
+#include <cmath>
+#include <limits>
+
+#include "absl/base/attributes.h"
+#include "absl/base/optimization.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace base_internal {
+
+// The algorithm generates a random number between 0 and 1 and applies the
+// inverse cumulative distribution function for an exponential. Specifically:
+// Let m be the inverse of the sample period, then the probability
+// distribution function is m*exp(-mx) so the CDF is
+// p = 1 - exp(-mx), so
+// q = 1 - p = exp(-mx)
+// log_e(q) = -mx
+// -log_e(q)/m = x
+// log_2(q) * (-log_e(2) * 1/m) = x
+// In the code, q is actually in the range 1 to 2**26, hence the -26 below
+int64_t ExponentialBiased::GetSkipCount(int64_t mean) {
+ if (ABSL_PREDICT_FALSE(!initialized_)) {
+ Initialize();
+ }
+
+ uint64_t rng = NextRandom(rng_);
+ rng_ = rng;
+
+ // Take the top 26 bits as the random number
+ // (This plus the 1<<58 sampling bound give a max possible step of
+ // 5194297183973780480 bytes.)
+ // The uint32_t cast is to prevent a (hard-to-reproduce) NAN
+ // under piii debug for some binaries.
+ double q = static_cast<uint32_t>(rng >> (kPrngNumBits - 26)) + 1.0;
+ // Put the computed p-value through the CDF of a geometric.
+ double interval = bias_ + (std::log2(q) - 26) * (-std::log(2.0) * mean);
+ // Very large values of interval overflow int64_t. To avoid that, we will
+ // cheat and clamp any huge values to (int64_t max)/2. This is a potential
+ // source of bias, but the mean would need to be such a large value that it's
+ // not likely to come up. For example, with a mean of 1e18, the probability of
+ // hitting this condition is about 1/1000. For a mean of 1e17, standard
+ // calculators claim that this event won't happen.
+ if (interval > static_cast<double>(std::numeric_limits<int64_t>::max() / 2)) {
+ // Assume huge values are bias neutral, retain bias for next call.
+ return std::numeric_limits<int64_t>::max() / 2;
+ }
+ double value = std::round(interval);
+ bias_ = interval - value;
+ return value;
+}
+
+int64_t ExponentialBiased::GetStride(int64_t mean) {
+ return GetSkipCount(mean - 1) + 1;
+}
+
+void ExponentialBiased::Initialize() {
+ // We don't get well distributed numbers from `this` so we call NextRandom() a
+ // bunch to mush the bits around. We use a global_rand to handle the case
+ // where the same thread (by memory address) gets created and destroyed
+ // repeatedly.
+ ABSL_CONST_INIT static std::atomic<uint32_t> global_rand(0);
+ uint64_t r = reinterpret_cast<uint64_t>(this) +
+ global_rand.fetch_add(1, std::memory_order_relaxed);
+ for (int i = 0; i < 20; ++i) {
+ r = NextRandom(r);
+ }
+ rng_ = r;
+ initialized_ = true;
+}
+
+} // namespace base_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/base/internal/exponential_biased.h b/third_party/abseil/src/absl/base/internal/exponential_biased.h
new file mode 100644
index 0000000..94f79a3
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/exponential_biased.h
@@ -0,0 +1,130 @@
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_BASE_INTERNAL_EXPONENTIAL_BIASED_H_
+#define ABSL_BASE_INTERNAL_EXPONENTIAL_BIASED_H_
+
+#include <stdint.h>
+
+#include "absl/base/config.h"
+#include "absl/base/macros.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace base_internal {
+
+// ExponentialBiased provides a small and fast random number generator for a
+// rounded exponential distribution. This generator manages very little state,
+// and imposes no synchronization overhead. This makes it useful in specialized
+// scenarios requiring minimum overhead, such as stride based periodic sampling.
+//
+// ExponentialBiased provides two closely related functions, GetSkipCount() and
+// GetStride(), both returning a rounded integer defining a number of events
+// required before some event with a given mean probability occurs.
+//
+// The distribution is useful to generate a random wait time or some periodic
+// event with a given mean probability. For example, if an action is supposed to
+// happen on average once every 'N' events, then we can get a random 'stride'
+// counting down how long before the event to happen. For example, if we'd want
+// to sample one in every 1000 'Frobber' calls, our code could look like this:
+//
+// Frobber::Frobber() {
+// stride_ = exponential_biased_.GetStride(1000);
+// }
+//
+// void Frobber::Frob(int arg) {
+// if (--stride == 0) {
+// SampleFrob(arg);
+// stride_ = exponential_biased_.GetStride(1000);
+// }
+// ...
+// }
+//
+// The rounding of the return value creates a bias, especially for smaller means
+// where the distribution of the fraction is not evenly distributed. We correct
+// this bias by tracking the fraction we rounded up or down on each iteration,
+// effectively tracking the distance between the cumulative value, and the
+// rounded cumulative value. For example, given a mean of 2:
+//
+// raw = 1.63076, cumulative = 1.63076, rounded = 2, bias = -0.36923
+// raw = 0.14624, cumulative = 1.77701, rounded = 2, bias = 0.14624
+// raw = 4.93194, cumulative = 6.70895, rounded = 7, bias = -0.06805
+// raw = 0.24206, cumulative = 6.95101, rounded = 7, bias = 0.24206
+// etc...
+//
+// Adjusting with rounding bias is relatively trivial:
+//
+// double value = bias_ + exponential_distribution(mean)();
+// double rounded_value = std::round(value);
+// bias_ = value - rounded_value;
+// return rounded_value;
+//
+// This class is thread-compatible.
+class ExponentialBiased {
+ public:
+ // The number of bits set by NextRandom.
+ static constexpr int kPrngNumBits = 48;
+
+ // `GetSkipCount()` returns the number of events to skip before some chosen
+ // event happens. For example, randomly tossing a coin, we will on average
+ // throw heads once before we get tails. We can simulate random coin tosses
+ // using GetSkipCount() as:
+ //
+ // ExponentialBiased eb;
+ // for (...) {
+ // int number_of_heads_before_tail = eb.GetSkipCount(1);
+ // for (int flips = 0; flips < number_of_heads_before_tail; ++flips) {
+ // printf("head...");
+ // }
+ // printf("tail\n");
+ // }
+ //
+ int64_t GetSkipCount(int64_t mean);
+
+ // GetStride() returns the number of events required for a specific event to
+ // happen. See the class comments for a usage example. `GetStride()` is
+ // equivalent to `GetSkipCount(mean - 1) + 1`. When to use `GetStride()` or
+ // `GetSkipCount()` depends mostly on what best fits the use case.
+ int64_t GetStride(int64_t mean);
+
+ // Computes a random number in the range [0, 1<<(kPrngNumBits+1) - 1]
+ //
+ // This is public to enable testing.
+ static uint64_t NextRandom(uint64_t rnd);
+
+ private:
+ void Initialize();
+
+ uint64_t rng_{0};
+ double bias_{0};
+ bool initialized_{false};
+};
+
+// Returns the next prng value.
+// pRNG is: aX+b mod c with a = 0x5DEECE66D, b = 0xB, c = 1<<48
+// This is the lrand64 generator.
+inline uint64_t ExponentialBiased::NextRandom(uint64_t rnd) {
+ const uint64_t prng_mult = uint64_t{0x5DEECE66D};
+ const uint64_t prng_add = 0xB;
+ const uint64_t prng_mod_power = 48;
+ const uint64_t prng_mod_mask =
+ ~((~static_cast<uint64_t>(0)) << prng_mod_power);
+ return (prng_mult * rnd + prng_add) & prng_mod_mask;
+}
+
+} // namespace base_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_BASE_INTERNAL_EXPONENTIAL_BIASED_H_
diff --git a/third_party/abseil/src/absl/base/internal/exponential_biased_test.cc b/third_party/abseil/src/absl/base/internal/exponential_biased_test.cc
new file mode 100644
index 0000000..075583c
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/exponential_biased_test.cc
@@ -0,0 +1,199 @@
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/base/internal/exponential_biased.h"
+
+#include <stddef.h>
+
+#include <cmath>
+#include <cstdint>
+#include <vector>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/strings/str_cat.h"
+
+using ::testing::Ge;
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace base_internal {
+
+MATCHER_P2(IsBetween, a, b,
+ absl::StrCat(std::string(negation ? "isn't" : "is"), " between ", a,
+ " and ", b)) {
+ return a <= arg && arg <= b;
+}
+
+// Tests of the quality of the random numbers generated
+// This uses the Anderson Darling test for uniformity.
+// See "Evaluating the Anderson-Darling Distribution" by Marsaglia
+// for details.
+
+// Short cut version of ADinf(z), z>0 (from Marsaglia)
+// This returns the p-value for Anderson Darling statistic in
+// the limit as n-> infinity. For finite n, apply the error fix below.
+double AndersonDarlingInf(double z) {
+ if (z < 2) {
+ return exp(-1.2337141 / z) / sqrt(z) *
+ (2.00012 +
+ (0.247105 -
+ (0.0649821 - (0.0347962 - (0.011672 - 0.00168691 * z) * z) * z) *
+ z) *
+ z);
+ }
+ return exp(
+ -exp(1.0776 -
+ (2.30695 -
+ (0.43424 - (0.082433 - (0.008056 - 0.0003146 * z) * z) * z) * z) *
+ z));
+}
+
+// Corrects the approximation error in AndersonDarlingInf for small values of n
+// Add this to AndersonDarlingInf to get a better approximation
+// (from Marsaglia)
+double AndersonDarlingErrFix(int n, double x) {
+ if (x > 0.8) {
+ return (-130.2137 +
+ (745.2337 -
+ (1705.091 - (1950.646 - (1116.360 - 255.7844 * x) * x) * x) * x) *
+ x) /
+ n;
+ }
+ double cutoff = 0.01265 + 0.1757 / n;
+ if (x < cutoff) {
+ double t = x / cutoff;
+ t = sqrt(t) * (1 - t) * (49 * t - 102);
+ return t * (0.0037 / (n * n) + 0.00078 / n + 0.00006) / n;
+ } else {
+ double t = (x - cutoff) / (0.8 - cutoff);
+ t = -0.00022633 +
+ (6.54034 - (14.6538 - (14.458 - (8.259 - 1.91864 * t) * t) * t) * t) *
+ t;
+ return t * (0.04213 + 0.01365 / n) / n;
+ }
+}
+
+// Returns the AndersonDarling p-value given n and the value of the statistic
+double AndersonDarlingPValue(int n, double z) {
+ double ad = AndersonDarlingInf(z);
+ double errfix = AndersonDarlingErrFix(n, ad);
+ return ad + errfix;
+}
+
+double AndersonDarlingStatistic(const std::vector<double>& random_sample) {
+ int n = random_sample.size();
+ double ad_sum = 0;
+ for (int i = 0; i < n; i++) {
+ ad_sum += (2 * i + 1) *
+ std::log(random_sample[i] * (1 - random_sample[n - 1 - i]));
+ }
+ double ad_statistic = -n - 1 / static_cast<double>(n) * ad_sum;
+ return ad_statistic;
+}
+
+// Tests if the array of doubles is uniformly distributed.
+// Returns the p-value of the Anderson Darling Statistic
+// for the given set of sorted random doubles
+// See "Evaluating the Anderson-Darling Distribution" by
+// Marsaglia and Marsaglia for details.
+double AndersonDarlingTest(const std::vector<double>& random_sample) {
+ double ad_statistic = AndersonDarlingStatistic(random_sample);
+ double p = AndersonDarlingPValue(random_sample.size(), ad_statistic);
+ return p;
+}
+
+TEST(ExponentialBiasedTest, CoinTossDemoWithGetSkipCount) {
+ ExponentialBiased eb;
+ for (int runs = 0; runs < 10; ++runs) {
+ for (int flips = eb.GetSkipCount(1); flips > 0; --flips) {
+ printf("head...");
+ }
+ printf("tail\n");
+ }
+ int heads = 0;
+ for (int i = 0; i < 10000000; i += 1 + eb.GetSkipCount(1)) {
+ ++heads;
+ }
+ printf("Heads = %d (%f%%)\n", heads, 100.0 * heads / 10000000);
+}
+
+TEST(ExponentialBiasedTest, SampleDemoWithStride) {
+ ExponentialBiased eb;
+ int stride = eb.GetStride(10);
+ int samples = 0;
+ for (int i = 0; i < 10000000; ++i) {
+ if (--stride == 0) {
+ ++samples;
+ stride = eb.GetStride(10);
+ }
+ }
+ printf("Samples = %d (%f%%)\n", samples, 100.0 * samples / 10000000);
+}
+
+
+// Testing that NextRandom generates uniform random numbers. Applies the
+// Anderson-Darling test for uniformity
+TEST(ExponentialBiasedTest, TestNextRandom) {
+ for (auto n : std::vector<int>({
+ 10, // Check short-range correlation
+ 100, 1000,
+ 10000 // Make sure there's no systemic error
+ })) {
+ uint64_t x = 1;
+ // This assumes that the prng returns 48 bit numbers
+ uint64_t max_prng_value = static_cast<uint64_t>(1) << 48;
+ // Initialize.
+ for (int i = 1; i <= 20; i++) {
+ x = ExponentialBiased::NextRandom(x);
+ }
+ std::vector<uint64_t> int_random_sample(n);
+ // Collect samples
+ for (int i = 0; i < n; i++) {
+ int_random_sample[i] = x;
+ x = ExponentialBiased::NextRandom(x);
+ }
+ // First sort them...
+ std::sort(int_random_sample.begin(), int_random_sample.end());
+ std::vector<double> random_sample(n);
+ // Convert them to uniform randoms (in the range [0,1])
+ for (int i = 0; i < n; i++) {
+ random_sample[i] =
+ static_cast<double>(int_random_sample[i]) / max_prng_value;
+ }
+ // Now compute the Anderson-Darling statistic
+ double ad_pvalue = AndersonDarlingTest(random_sample);
+ EXPECT_GT(std::min(ad_pvalue, 1 - ad_pvalue), 0.0001)
+ << "prng is not uniform: n = " << n << " p = " << ad_pvalue;
+ }
+}
+
+// The generator needs to be available as a thread_local and as a static
+// variable.
+TEST(ExponentialBiasedTest, InitializationModes) {
+ ABSL_CONST_INIT static ExponentialBiased eb_static;
+ EXPECT_THAT(eb_static.GetSkipCount(2), Ge(0));
+
+#ifdef ABSL_HAVE_THREAD_LOCAL
+ thread_local ExponentialBiased eb_thread;
+ EXPECT_THAT(eb_thread.GetSkipCount(2), Ge(0));
+#endif
+
+ ExponentialBiased eb_stack;
+ EXPECT_THAT(eb_stack.GetSkipCount(2), Ge(0));
+}
+
+} // namespace base_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/base/internal/fast_type_id.h b/third_party/abseil/src/absl/base/internal/fast_type_id.h
new file mode 100644
index 0000000..3db59e8
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/fast_type_id.h
@@ -0,0 +1,48 @@
+//
+// Copyright 2020 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+#ifndef ABSL_BASE_INTERNAL_FAST_TYPE_ID_H_
+#define ABSL_BASE_INTERNAL_FAST_TYPE_ID_H_
+
+#include "absl/base/config.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace base_internal {
+
+template <typename Type>
+struct FastTypeTag {
+ constexpr static char dummy_var = 0;
+};
+
+template <typename Type>
+constexpr char FastTypeTag<Type>::dummy_var;
+
+// FastTypeId<Type>() evaluates at compile/link-time to a unique pointer for the
+// passed-in type. These are meant to be good match for keys into maps or
+// straight up comparisons.
+using FastTypeIdType = const void*;
+
+template <typename Type>
+constexpr inline FastTypeIdType FastTypeId() {
+ return &FastTypeTag<Type>::dummy_var;
+}
+
+} // namespace base_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_BASE_INTERNAL_FAST_TYPE_ID_H_
diff --git a/third_party/abseil/src/absl/base/internal/fast_type_id_test.cc b/third_party/abseil/src/absl/base/internal/fast_type_id_test.cc
new file mode 100644
index 0000000..16f3c14
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/fast_type_id_test.cc
@@ -0,0 +1,123 @@
+// Copyright 2020 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/base/internal/fast_type_id.h"
+
+#include <cstdint>
+#include <map>
+#include <vector>
+
+#include "gtest/gtest.h"
+
+namespace {
+namespace bi = absl::base_internal;
+
+// NOLINTNEXTLINE
+#define PRIM_TYPES(A) \
+ A(bool) \
+ A(short) \
+ A(unsigned short) \
+ A(int) \
+ A(unsigned int) \
+ A(long) \
+ A(unsigned long) \
+ A(long long) \
+ A(unsigned long long) \
+ A(float) \
+ A(double) \
+ A(long double)
+
+TEST(FastTypeIdTest, PrimitiveTypes) {
+ bi::FastTypeIdType type_ids[] = {
+#define A(T) bi::FastTypeId<T>(),
+ PRIM_TYPES(A)
+#undef A
+#define A(T) bi::FastTypeId<const T>(),
+ PRIM_TYPES(A)
+#undef A
+#define A(T) bi::FastTypeId<volatile T>(),
+ PRIM_TYPES(A)
+#undef A
+#define A(T) bi::FastTypeId<const volatile T>(),
+ PRIM_TYPES(A)
+#undef A
+ };
+ size_t total_type_ids = sizeof(type_ids) / sizeof(bi::FastTypeIdType);
+
+ for (int i = 0; i < total_type_ids; ++i) {
+ EXPECT_EQ(type_ids[i], type_ids[i]);
+ for (int j = 0; j < i; ++j) {
+ EXPECT_NE(type_ids[i], type_ids[j]);
+ }
+ }
+}
+
+#define FIXED_WIDTH_TYPES(A) \
+ A(int8_t) \
+ A(uint8_t) \
+ A(int16_t) \
+ A(uint16_t) \
+ A(int32_t) \
+ A(uint32_t) \
+ A(int64_t) \
+ A(uint64_t)
+
+TEST(FastTypeIdTest, FixedWidthTypes) {
+ bi::FastTypeIdType type_ids[] = {
+#define A(T) bi::FastTypeId<T>(),
+ FIXED_WIDTH_TYPES(A)
+#undef A
+#define A(T) bi::FastTypeId<const T>(),
+ FIXED_WIDTH_TYPES(A)
+#undef A
+#define A(T) bi::FastTypeId<volatile T>(),
+ FIXED_WIDTH_TYPES(A)
+#undef A
+#define A(T) bi::FastTypeId<const volatile T>(),
+ FIXED_WIDTH_TYPES(A)
+#undef A
+ };
+ size_t total_type_ids = sizeof(type_ids) / sizeof(bi::FastTypeIdType);
+
+ for (int i = 0; i < total_type_ids; ++i) {
+ EXPECT_EQ(type_ids[i], type_ids[i]);
+ for (int j = 0; j < i; ++j) {
+ EXPECT_NE(type_ids[i], type_ids[j]);
+ }
+ }
+}
+
+TEST(FastTypeIdTest, AliasTypes) {
+ using int_alias = int;
+ EXPECT_EQ(bi::FastTypeId<int_alias>(), bi::FastTypeId<int>());
+}
+
+TEST(FastTypeIdTest, TemplateSpecializations) {
+ EXPECT_NE(bi::FastTypeId<std::vector<int>>(),
+ bi::FastTypeId<std::vector<long>>());
+
+ EXPECT_NE((bi::FastTypeId<std::map<int, float>>()),
+ (bi::FastTypeId<std::map<int, double>>()));
+}
+
+struct Base {};
+struct Derived : Base {};
+struct PDerived : private Base {};
+
+TEST(FastTypeIdTest, Inheritance) {
+ EXPECT_NE(bi::FastTypeId<Base>(), bi::FastTypeId<Derived>());
+ EXPECT_NE(bi::FastTypeId<Base>(), bi::FastTypeId<PDerived>());
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/base/internal/hide_ptr.h b/third_party/abseil/src/absl/base/internal/hide_ptr.h
new file mode 100644
index 0000000..1dba809
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/hide_ptr.h
@@ -0,0 +1,51 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_BASE_INTERNAL_HIDE_PTR_H_
+#define ABSL_BASE_INTERNAL_HIDE_PTR_H_
+
+#include <cstdint>
+
+#include "absl/base/config.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace base_internal {
+
+// Arbitrary value with high bits set. Xor'ing with it is unlikely
+// to map one valid pointer to another valid pointer.
+constexpr uintptr_t HideMask() {
+ return (uintptr_t{0xF03A5F7BU} << (sizeof(uintptr_t) - 4) * 8) | 0xF03A5F7BU;
+}
+
+// Hide a pointer from the leak checker. For internal use only.
+// Differs from absl::IgnoreLeak(ptr) in that absl::IgnoreLeak(ptr) causes ptr
+// and all objects reachable from ptr to be ignored by the leak checker.
+template <class T>
+inline uintptr_t HidePtr(T* ptr) {
+ return reinterpret_cast<uintptr_t>(ptr) ^ HideMask();
+}
+
+// Return a pointer that has been hidden from the leak checker.
+// For internal use only.
+template <class T>
+inline T* UnhidePtr(uintptr_t hidden) {
+ return reinterpret_cast<T*>(hidden ^ HideMask());
+}
+
+} // namespace base_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_BASE_INTERNAL_HIDE_PTR_H_
diff --git a/third_party/abseil/src/absl/base/internal/identity.h b/third_party/abseil/src/absl/base/internal/identity.h
new file mode 100644
index 0000000..a3154ed
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/identity.h
@@ -0,0 +1,37 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+#ifndef ABSL_BASE_INTERNAL_IDENTITY_H_
+#define ABSL_BASE_INTERNAL_IDENTITY_H_
+
+#include "absl/base/config.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace internal {
+
+template <typename T>
+struct identity {
+ typedef T type;
+};
+
+template <typename T>
+using identity_t = typename identity<T>::type;
+
+} // namespace internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_BASE_INTERNAL_IDENTITY_H_
diff --git a/third_party/abseil/src/absl/base/internal/inline_variable.h b/third_party/abseil/src/absl/base/internal/inline_variable.h
new file mode 100644
index 0000000..130d8c2
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/inline_variable.h
@@ -0,0 +1,107 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_BASE_INTERNAL_INLINE_VARIABLE_EMULATION_H_
+#define ABSL_BASE_INTERNAL_INLINE_VARIABLE_EMULATION_H_
+
+#include <type_traits>
+
+#include "absl/base/internal/identity.h"
+
+// File:
+// This file define a macro that allows the creation of or emulation of C++17
+// inline variables based on whether or not the feature is supported.
+
+////////////////////////////////////////////////////////////////////////////////
+// Macro: ABSL_INTERNAL_INLINE_CONSTEXPR(type, name, init)
+//
+// Description:
+// Expands to the equivalent of an inline constexpr instance of the specified
+// `type` and `name`, initialized to the value `init`. If the compiler being
+// used is detected as supporting actual inline variables as a language
+// feature, then the macro expands to an actual inline variable definition.
+//
+// Requires:
+// `type` is a type that is usable in an extern variable declaration.
+//
+// Requires: `name` is a valid identifier
+//
+// Requires:
+// `init` is an expression that can be used in the following definition:
+// constexpr type name = init;
+//
+// Usage:
+//
+// // Equivalent to: `inline constexpr size_t variant_npos = -1;`
+// ABSL_INTERNAL_INLINE_CONSTEXPR(size_t, variant_npos, -1);
+//
+// Differences in implementation:
+// For a direct, language-level inline variable, decltype(name) will be the
+// type that was specified along with const qualification, whereas for
+// emulated inline variables, decltype(name) may be different (in practice
+// it will likely be a reference type).
+////////////////////////////////////////////////////////////////////////////////
+
+#ifdef __cpp_inline_variables
+
+// Clang's -Wmissing-variable-declarations option erroneously warned that
+// inline constexpr objects need to be pre-declared. This has now been fixed,
+// but we will need to support this workaround for people building with older
+// versions of clang.
+//
+// Bug: https://bugs.llvm.org/show_bug.cgi?id=35862
+//
+// Note:
+// identity_t is used here so that the const and name are in the
+// appropriate place for pointer types, reference types, function pointer
+// types, etc..
+#if defined(__clang__)
+#define ABSL_INTERNAL_EXTERN_DECL(type, name) \
+ extern const ::absl::internal::identity_t<type> name;
+#else // Otherwise, just define the macro to do nothing.
+#define ABSL_INTERNAL_EXTERN_DECL(type, name)
+#endif // defined(__clang__)
+
+// See above comment at top of file for details.
+#define ABSL_INTERNAL_INLINE_CONSTEXPR(type, name, init) \
+ ABSL_INTERNAL_EXTERN_DECL(type, name) \
+ inline constexpr ::absl::internal::identity_t<type> name = init
+
+#else
+
+// See above comment at top of file for details.
+//
+// Note:
+// identity_t is used here so that the const and name are in the
+// appropriate place for pointer types, reference types, function pointer
+// types, etc..
+#define ABSL_INTERNAL_INLINE_CONSTEXPR(var_type, name, init) \
+ template <class /*AbslInternalDummy*/ = void> \
+ struct AbslInternalInlineVariableHolder##name { \
+ static constexpr ::absl::internal::identity_t<var_type> kInstance = init; \
+ }; \
+ \
+ template <class AbslInternalDummy> \
+ constexpr ::absl::internal::identity_t<var_type> \
+ AbslInternalInlineVariableHolder##name<AbslInternalDummy>::kInstance; \
+ \
+ static constexpr const ::absl::internal::identity_t<var_type>& \
+ name = /* NOLINT */ \
+ AbslInternalInlineVariableHolder##name<>::kInstance; \
+ static_assert(sizeof(void (*)(decltype(name))) != 0, \
+ "Silence unused variable warnings.")
+
+#endif // __cpp_inline_variables
+
+#endif // ABSL_BASE_INTERNAL_INLINE_VARIABLE_EMULATION_H_
diff --git a/third_party/abseil/src/absl/base/internal/inline_variable_testing.h b/third_party/abseil/src/absl/base/internal/inline_variable_testing.h
new file mode 100644
index 0000000..3856b9f
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/inline_variable_testing.h
@@ -0,0 +1,46 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_BASE_INLINE_VARIABLE_TESTING_H_
+#define ABSL_BASE_INLINE_VARIABLE_TESTING_H_
+
+#include "absl/base/internal/inline_variable.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace inline_variable_testing_internal {
+
+struct Foo {
+ int value = 5;
+};
+
+ABSL_INTERNAL_INLINE_CONSTEXPR(Foo, inline_variable_foo, {});
+ABSL_INTERNAL_INLINE_CONSTEXPR(Foo, other_inline_variable_foo, {});
+
+ABSL_INTERNAL_INLINE_CONSTEXPR(int, inline_variable_int, 5);
+ABSL_INTERNAL_INLINE_CONSTEXPR(int, other_inline_variable_int, 5);
+
+ABSL_INTERNAL_INLINE_CONSTEXPR(void(*)(), inline_variable_fun_ptr, nullptr);
+
+const Foo& get_foo_a();
+const Foo& get_foo_b();
+
+const int& get_int_a();
+const int& get_int_b();
+
+} // namespace inline_variable_testing_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_BASE_INLINE_VARIABLE_TESTING_H_
diff --git a/third_party/abseil/src/absl/base/internal/invoke.h b/third_party/abseil/src/absl/base/internal/invoke.h
new file mode 100644
index 0000000..5c71f32
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/invoke.h
@@ -0,0 +1,187 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// absl::base_internal::invoke(f, args...) is an implementation of
+// INVOKE(f, args...) from section [func.require] of the C++ standard.
+//
+// [func.require]
+// Define INVOKE (f, t1, t2, ..., tN) as follows:
+// 1. (t1.*f)(t2, ..., tN) when f is a pointer to a member function of a class T
+// and t1 is an object of type T or a reference to an object of type T or a
+// reference to an object of a type derived from T;
+// 2. ((*t1).*f)(t2, ..., tN) when f is a pointer to a member function of a
+// class T and t1 is not one of the types described in the previous item;
+// 3. t1.*f when N == 1 and f is a pointer to member data of a class T and t1 is
+// an object of type T or a reference to an object of type T or a reference
+// to an object of a type derived from T;
+// 4. (*t1).*f when N == 1 and f is a pointer to member data of a class T and t1
+// is not one of the types described in the previous item;
+// 5. f(t1, t2, ..., tN) in all other cases.
+//
+// The implementation is SFINAE-friendly: substitution failure within invoke()
+// isn't an error.
+
+#ifndef ABSL_BASE_INTERNAL_INVOKE_H_
+#define ABSL_BASE_INTERNAL_INVOKE_H_
+
+#include <algorithm>
+#include <type_traits>
+#include <utility>
+
+#include "absl/meta/type_traits.h"
+
+// The following code is internal implementation detail. See the comment at the
+// top of this file for the API documentation.
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace base_internal {
+
+// The five classes below each implement one of the clauses from the definition
+// of INVOKE. The inner class template Accept<F, Args...> checks whether the
+// clause is applicable; static function template Invoke(f, args...) does the
+// invocation.
+//
+// By separating the clause selection logic from invocation we make sure that
+// Invoke() does exactly what the standard says.
+
+template <typename Derived>
+struct StrippedAccept {
+ template <typename... Args>
+ struct Accept : Derived::template AcceptImpl<typename std::remove_cv<
+ typename std::remove_reference<Args>::type>::type...> {};
+};
+
+// (t1.*f)(t2, ..., tN) when f is a pointer to a member function of a class T
+// and t1 is an object of type T or a reference to an object of type T or a
+// reference to an object of a type derived from T.
+struct MemFunAndRef : StrippedAccept<MemFunAndRef> {
+ template <typename... Args>
+ struct AcceptImpl : std::false_type {};
+
+ template <typename MemFunType, typename C, typename Obj, typename... Args>
+ struct AcceptImpl<MemFunType C::*, Obj, Args...>
+ : std::integral_constant<bool, std::is_base_of<C, Obj>::value &&
+ absl::is_function<MemFunType>::value> {
+ };
+
+ template <typename MemFun, typename Obj, typename... Args>
+ static decltype((std::declval<Obj>().*
+ std::declval<MemFun>())(std::declval<Args>()...))
+ Invoke(MemFun&& mem_fun, Obj&& obj, Args&&... args) {
+ return (std::forward<Obj>(obj).*
+ std::forward<MemFun>(mem_fun))(std::forward<Args>(args)...);
+ }
+};
+
+// ((*t1).*f)(t2, ..., tN) when f is a pointer to a member function of a
+// class T and t1 is not one of the types described in the previous item.
+struct MemFunAndPtr : StrippedAccept<MemFunAndPtr> {
+ template <typename... Args>
+ struct AcceptImpl : std::false_type {};
+
+ template <typename MemFunType, typename C, typename Ptr, typename... Args>
+ struct AcceptImpl<MemFunType C::*, Ptr, Args...>
+ : std::integral_constant<bool, !std::is_base_of<C, Ptr>::value &&
+ absl::is_function<MemFunType>::value> {
+ };
+
+ template <typename MemFun, typename Ptr, typename... Args>
+ static decltype(((*std::declval<Ptr>()).*
+ std::declval<MemFun>())(std::declval<Args>()...))
+ Invoke(MemFun&& mem_fun, Ptr&& ptr, Args&&... args) {
+ return ((*std::forward<Ptr>(ptr)).*
+ std::forward<MemFun>(mem_fun))(std::forward<Args>(args)...);
+ }
+};
+
+// t1.*f when N == 1 and f is a pointer to member data of a class T and t1 is
+// an object of type T or a reference to an object of type T or a reference
+// to an object of a type derived from T.
+struct DataMemAndRef : StrippedAccept<DataMemAndRef> {
+ template <typename... Args>
+ struct AcceptImpl : std::false_type {};
+
+ template <typename R, typename C, typename Obj>
+ struct AcceptImpl<R C::*, Obj>
+ : std::integral_constant<bool, std::is_base_of<C, Obj>::value &&
+ !absl::is_function<R>::value> {};
+
+ template <typename DataMem, typename Ref>
+ static decltype(std::declval<Ref>().*std::declval<DataMem>()) Invoke(
+ DataMem&& data_mem, Ref&& ref) {
+ return std::forward<Ref>(ref).*std::forward<DataMem>(data_mem);
+ }
+};
+
+// (*t1).*f when N == 1 and f is a pointer to member data of a class T and t1
+// is not one of the types described in the previous item.
+struct DataMemAndPtr : StrippedAccept<DataMemAndPtr> {
+ template <typename... Args>
+ struct AcceptImpl : std::false_type {};
+
+ template <typename R, typename C, typename Ptr>
+ struct AcceptImpl<R C::*, Ptr>
+ : std::integral_constant<bool, !std::is_base_of<C, Ptr>::value &&
+ !absl::is_function<R>::value> {};
+
+ template <typename DataMem, typename Ptr>
+ static decltype((*std::declval<Ptr>()).*std::declval<DataMem>()) Invoke(
+ DataMem&& data_mem, Ptr&& ptr) {
+ return (*std::forward<Ptr>(ptr)).*std::forward<DataMem>(data_mem);
+ }
+};
+
+// f(t1, t2, ..., tN) in all other cases.
+struct Callable {
+ // Callable doesn't have Accept because it's the last clause that gets picked
+ // when none of the previous clauses are applicable.
+ template <typename F, typename... Args>
+ static decltype(std::declval<F>()(std::declval<Args>()...)) Invoke(
+ F&& f, Args&&... args) {
+ return std::forward<F>(f)(std::forward<Args>(args)...);
+ }
+};
+
+// Resolves to the first matching clause.
+template <typename... Args>
+struct Invoker {
+ typedef typename std::conditional<
+ MemFunAndRef::Accept<Args...>::value, MemFunAndRef,
+ typename std::conditional<
+ MemFunAndPtr::Accept<Args...>::value, MemFunAndPtr,
+ typename std::conditional<
+ DataMemAndRef::Accept<Args...>::value, DataMemAndRef,
+ typename std::conditional<DataMemAndPtr::Accept<Args...>::value,
+ DataMemAndPtr, Callable>::type>::type>::
+ type>::type type;
+};
+
+// The result type of Invoke<F, Args...>.
+template <typename F, typename... Args>
+using invoke_result_t = decltype(Invoker<F, Args...>::type::Invoke(
+ std::declval<F>(), std::declval<Args>()...));
+
+// Invoke(f, args...) is an implementation of INVOKE(f, args...) from section
+// [func.require] of the C++ standard.
+template <typename F, typename... Args>
+invoke_result_t<F, Args...> invoke(F&& f, Args&&... args) {
+ return Invoker<F, Args...>::type::Invoke(std::forward<F>(f),
+ std::forward<Args>(args)...);
+}
+} // namespace base_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_BASE_INTERNAL_INVOKE_H_
diff --git a/third_party/abseil/src/absl/base/internal/low_level_alloc.cc b/third_party/abseil/src/absl/base/internal/low_level_alloc.cc
new file mode 100644
index 0000000..229ab91
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/low_level_alloc.cc
@@ -0,0 +1,620 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// A low-level allocator that can be used by other low-level
+// modules without introducing dependency cycles.
+// This allocator is slow and wasteful of memory;
+// it should not be used when performance is key.
+
+#include "absl/base/internal/low_level_alloc.h"
+
+#include <type_traits>
+
+#include "absl/base/call_once.h"
+#include "absl/base/config.h"
+#include "absl/base/internal/direct_mmap.h"
+#include "absl/base/internal/scheduling_mode.h"
+#include "absl/base/macros.h"
+#include "absl/base/thread_annotations.h"
+
+// LowLevelAlloc requires that the platform support low-level
+// allocation of virtual memory. Platforms lacking this cannot use
+// LowLevelAlloc.
+#ifndef ABSL_LOW_LEVEL_ALLOC_MISSING
+
+#ifndef _WIN32
+#include <pthread.h>
+#include <signal.h>
+#include <sys/mman.h>
+#include <unistd.h>
+#else
+#include <windows.h>
+#endif
+
+#include <string.h>
+#include <algorithm>
+#include <atomic>
+#include <cerrno>
+#include <cstddef>
+#include <new> // for placement-new
+
+#include "absl/base/dynamic_annotations.h"
+#include "absl/base/internal/raw_logging.h"
+#include "absl/base/internal/spinlock.h"
+
+// MAP_ANONYMOUS
+#if defined(__APPLE__)
+// For mmap, Linux defines both MAP_ANONYMOUS and MAP_ANON and says MAP_ANON is
+// deprecated. In Darwin, MAP_ANON is all there is.
+#if !defined MAP_ANONYMOUS
+#define MAP_ANONYMOUS MAP_ANON
+#endif // !MAP_ANONYMOUS
+#endif // __APPLE__
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace base_internal {
+
+// A first-fit allocator with amortized logarithmic free() time.
+
+// ---------------------------------------------------------------------------
+static const int kMaxLevel = 30;
+
+namespace {
+// This struct describes one allocated block, or one free block.
+struct AllocList {
+ struct Header {
+ // Size of entire region, including this field. Must be
+ // first. Valid in both allocated and unallocated blocks.
+ uintptr_t size;
+
+ // kMagicAllocated or kMagicUnallocated xor this.
+ uintptr_t magic;
+
+ // Pointer to parent arena.
+ LowLevelAlloc::Arena *arena;
+
+ // Aligns regions to 0 mod 2*sizeof(void*).
+ void *dummy_for_alignment;
+ } header;
+
+ // Next two fields: in unallocated blocks: freelist skiplist data
+ // in allocated blocks: overlaps with client data
+
+ // Levels in skiplist used.
+ int levels;
+
+ // Actually has levels elements. The AllocList node may not have room
+ // for all kMaxLevel entries. See max_fit in LLA_SkiplistLevels().
+ AllocList *next[kMaxLevel];
+};
+} // namespace
+
+// ---------------------------------------------------------------------------
+// A trivial skiplist implementation. This is used to keep the freelist
+// in address order while taking only logarithmic time per insert and delete.
+
+// An integer approximation of log2(size/base)
+// Requires size >= base.
+static int IntLog2(size_t size, size_t base) {
+ int result = 0;
+ for (size_t i = size; i > base; i >>= 1) { // i == floor(size/2**result)
+ result++;
+ }
+ // floor(size / 2**result) <= base < floor(size / 2**(result-1))
+ // => log2(size/(base+1)) <= result < 1+log2(size/base)
+ // => result ~= log2(size/base)
+ return result;
+}
+
+// Return a random integer n: p(n)=1/(2**n) if 1 <= n; p(n)=0 if n < 1.
+static int Random(uint32_t *state) {
+ uint32_t r = *state;
+ int result = 1;
+ while ((((r = r*1103515245 + 12345) >> 30) & 1) == 0) {
+ result++;
+ }
+ *state = r;
+ return result;
+}
+
+// Return a number of skiplist levels for a node of size bytes, where
+// base is the minimum node size. Compute level=log2(size / base)+n
+// where n is 1 if random is false and otherwise a random number generated with
+// the standard distribution for a skiplist: See Random() above.
+// Bigger nodes tend to have more skiplist levels due to the log2(size / base)
+// term, so first-fit searches touch fewer nodes. "level" is clipped so
+// level<kMaxLevel and next[level-1] will fit in the node.
+// 0 < LLA_SkiplistLevels(x,y,false) <= LLA_SkiplistLevels(x,y,true) < kMaxLevel
+static int LLA_SkiplistLevels(size_t size, size_t base, uint32_t *random) {
+ // max_fit is the maximum number of levels that will fit in a node for the
+ // given size. We can't return more than max_fit, no matter what the
+ // random number generator says.
+ size_t max_fit = (size - offsetof(AllocList, next)) / sizeof(AllocList *);
+ int level = IntLog2(size, base) + (random != nullptr ? Random(random) : 1);
+ if (static_cast<size_t>(level) > max_fit) level = static_cast<int>(max_fit);
+ if (level > kMaxLevel-1) level = kMaxLevel - 1;
+ ABSL_RAW_CHECK(level >= 1, "block not big enough for even one level");
+ return level;
+}
+
+// Return "atleast", the first element of AllocList *head s.t. *atleast >= *e.
+// For 0 <= i < head->levels, set prev[i] to "no_greater", where no_greater
+// points to the last element at level i in the AllocList less than *e, or is
+// head if no such element exists.
+static AllocList *LLA_SkiplistSearch(AllocList *head,
+ AllocList *e, AllocList **prev) {
+ AllocList *p = head;
+ for (int level = head->levels - 1; level >= 0; level--) {
+ for (AllocList *n; (n = p->next[level]) != nullptr && n < e; p = n) {
+ }
+ prev[level] = p;
+ }
+ return (head->levels == 0) ? nullptr : prev[0]->next[0];
+}
+
+// Insert element *e into AllocList *head. Set prev[] as LLA_SkiplistSearch.
+// Requires that e->levels be previously set by the caller (using
+// LLA_SkiplistLevels())
+static void LLA_SkiplistInsert(AllocList *head, AllocList *e,
+ AllocList **prev) {
+ LLA_SkiplistSearch(head, e, prev);
+ for (; head->levels < e->levels; head->levels++) { // extend prev pointers
+ prev[head->levels] = head; // to all *e's levels
+ }
+ for (int i = 0; i != e->levels; i++) { // add element to list
+ e->next[i] = prev[i]->next[i];
+ prev[i]->next[i] = e;
+ }
+}
+
+// Remove element *e from AllocList *head. Set prev[] as LLA_SkiplistSearch().
+// Requires that e->levels be previous set by the caller (using
+// LLA_SkiplistLevels())
+static void LLA_SkiplistDelete(AllocList *head, AllocList *e,
+ AllocList **prev) {
+ AllocList *found = LLA_SkiplistSearch(head, e, prev);
+ ABSL_RAW_CHECK(e == found, "element not in freelist");
+ for (int i = 0; i != e->levels && prev[i]->next[i] == e; i++) {
+ prev[i]->next[i] = e->next[i];
+ }
+ while (head->levels > 0 && head->next[head->levels - 1] == nullptr) {
+ head->levels--; // reduce head->levels if level unused
+ }
+}
+
+// ---------------------------------------------------------------------------
+// Arena implementation
+
+// Metadata for an LowLevelAlloc arena instance.
+struct LowLevelAlloc::Arena {
+ // Constructs an arena with the given LowLevelAlloc flags.
+ explicit Arena(uint32_t flags_value);
+
+ base_internal::SpinLock mu;
+ // Head of free list, sorted by address
+ AllocList freelist ABSL_GUARDED_BY(mu);
+ // Count of allocated blocks
+ int32_t allocation_count ABSL_GUARDED_BY(mu);
+ // flags passed to NewArena
+ const uint32_t flags;
+ // Result of sysconf(_SC_PAGESIZE)
+ const size_t pagesize;
+ // Lowest power of two >= max(16, sizeof(AllocList))
+ const size_t round_up;
+ // Smallest allocation block size
+ const size_t min_size;
+ // PRNG state
+ uint32_t random ABSL_GUARDED_BY(mu);
+};
+
+namespace {
+// Static storage space for the lazily-constructed, default global arena
+// instances. We require this space because the whole point of LowLevelAlloc
+// is to avoid relying on malloc/new.
+alignas(LowLevelAlloc::Arena) unsigned char default_arena_storage[sizeof(
+ LowLevelAlloc::Arena)];
+alignas(LowLevelAlloc::Arena) unsigned char unhooked_arena_storage[sizeof(
+ LowLevelAlloc::Arena)];
+#ifndef ABSL_LOW_LEVEL_ALLOC_ASYNC_SIGNAL_SAFE_MISSING
+alignas(
+ LowLevelAlloc::Arena) unsigned char unhooked_async_sig_safe_arena_storage
+ [sizeof(LowLevelAlloc::Arena)];
+#endif
+
+// We must use LowLevelCallOnce here to construct the global arenas, rather than
+// using function-level statics, to avoid recursively invoking the scheduler.
+absl::once_flag create_globals_once;
+
+void CreateGlobalArenas() {
+ new (&default_arena_storage)
+ LowLevelAlloc::Arena(LowLevelAlloc::kCallMallocHook);
+ new (&unhooked_arena_storage) LowLevelAlloc::Arena(0);
+#ifndef ABSL_LOW_LEVEL_ALLOC_ASYNC_SIGNAL_SAFE_MISSING
+ new (&unhooked_async_sig_safe_arena_storage)
+ LowLevelAlloc::Arena(LowLevelAlloc::kAsyncSignalSafe);
+#endif
+}
+
+// Returns a global arena that does not call into hooks. Used by NewArena()
+// when kCallMallocHook is not set.
+LowLevelAlloc::Arena* UnhookedArena() {
+ base_internal::LowLevelCallOnce(&create_globals_once, CreateGlobalArenas);
+ return reinterpret_cast<LowLevelAlloc::Arena*>(&unhooked_arena_storage);
+}
+
+#ifndef ABSL_LOW_LEVEL_ALLOC_ASYNC_SIGNAL_SAFE_MISSING
+// Returns a global arena that is async-signal safe. Used by NewArena() when
+// kAsyncSignalSafe is set.
+LowLevelAlloc::Arena *UnhookedAsyncSigSafeArena() {
+ base_internal::LowLevelCallOnce(&create_globals_once, CreateGlobalArenas);
+ return reinterpret_cast<LowLevelAlloc::Arena *>(
+ &unhooked_async_sig_safe_arena_storage);
+}
+#endif
+
+} // namespace
+
+// Returns the default arena, as used by LowLevelAlloc::Alloc() and friends.
+LowLevelAlloc::Arena *LowLevelAlloc::DefaultArena() {
+ base_internal::LowLevelCallOnce(&create_globals_once, CreateGlobalArenas);
+ return reinterpret_cast<LowLevelAlloc::Arena*>(&default_arena_storage);
+}
+
+// magic numbers to identify allocated and unallocated blocks
+static const uintptr_t kMagicAllocated = 0x4c833e95U;
+static const uintptr_t kMagicUnallocated = ~kMagicAllocated;
+
+namespace {
+class ABSL_SCOPED_LOCKABLE ArenaLock {
+ public:
+ explicit ArenaLock(LowLevelAlloc::Arena *arena)
+ ABSL_EXCLUSIVE_LOCK_FUNCTION(arena->mu)
+ : arena_(arena) {
+#ifndef ABSL_LOW_LEVEL_ALLOC_ASYNC_SIGNAL_SAFE_MISSING
+ if ((arena->flags & LowLevelAlloc::kAsyncSignalSafe) != 0) {
+ sigset_t all;
+ sigfillset(&all);
+ mask_valid_ = pthread_sigmask(SIG_BLOCK, &all, &mask_) == 0;
+ }
+#endif
+ arena_->mu.Lock();
+ }
+ ~ArenaLock() { ABSL_RAW_CHECK(left_, "haven't left Arena region"); }
+ void Leave() ABSL_UNLOCK_FUNCTION() {
+ arena_->mu.Unlock();
+#ifndef ABSL_LOW_LEVEL_ALLOC_ASYNC_SIGNAL_SAFE_MISSING
+ if (mask_valid_) {
+ const int err = pthread_sigmask(SIG_SETMASK, &mask_, nullptr);
+ if (err != 0) {
+ ABSL_RAW_LOG(FATAL, "pthread_sigmask failed: %d", err);
+ }
+ }
+#endif
+ left_ = true;
+ }
+
+ private:
+ bool left_ = false; // whether left region
+#ifndef ABSL_LOW_LEVEL_ALLOC_ASYNC_SIGNAL_SAFE_MISSING
+ bool mask_valid_ = false;
+ sigset_t mask_; // old mask of blocked signals
+#endif
+ LowLevelAlloc::Arena *arena_;
+ ArenaLock(const ArenaLock &) = delete;
+ ArenaLock &operator=(const ArenaLock &) = delete;
+};
+} // namespace
+
+// create an appropriate magic number for an object at "ptr"
+// "magic" should be kMagicAllocated or kMagicUnallocated
+inline static uintptr_t Magic(uintptr_t magic, AllocList::Header *ptr) {
+ return magic ^ reinterpret_cast<uintptr_t>(ptr);
+}
+
+namespace {
+size_t GetPageSize() {
+#ifdef _WIN32
+ SYSTEM_INFO system_info;
+ GetSystemInfo(&system_info);
+ return std::max(system_info.dwPageSize, system_info.dwAllocationGranularity);
+#elif defined(__wasm__) || defined(__asmjs__)
+ return getpagesize();
+#else
+ return sysconf(_SC_PAGESIZE);
+#endif
+}
+
+size_t RoundedUpBlockSize() {
+ // Round up block sizes to a power of two close to the header size.
+ size_t round_up = 16;
+ while (round_up < sizeof(AllocList::Header)) {
+ round_up += round_up;
+ }
+ return round_up;
+}
+
+} // namespace
+
+LowLevelAlloc::Arena::Arena(uint32_t flags_value)
+ : mu(base_internal::SCHEDULE_KERNEL_ONLY),
+ allocation_count(0),
+ flags(flags_value),
+ pagesize(GetPageSize()),
+ round_up(RoundedUpBlockSize()),
+ min_size(2 * round_up),
+ random(0) {
+ freelist.header.size = 0;
+ freelist.header.magic =
+ Magic(kMagicUnallocated, &freelist.header);
+ freelist.header.arena = this;
+ freelist.levels = 0;
+ memset(freelist.next, 0, sizeof(freelist.next));
+}
+
+// L < meta_data_arena->mu
+LowLevelAlloc::Arena *LowLevelAlloc::NewArena(int32_t flags) {
+ Arena *meta_data_arena = DefaultArena();
+#ifndef ABSL_LOW_LEVEL_ALLOC_ASYNC_SIGNAL_SAFE_MISSING
+ if ((flags & LowLevelAlloc::kAsyncSignalSafe) != 0) {
+ meta_data_arena = UnhookedAsyncSigSafeArena();
+ } else // NOLINT(readability/braces)
+#endif
+ if ((flags & LowLevelAlloc::kCallMallocHook) == 0) {
+ meta_data_arena = UnhookedArena();
+ }
+ Arena *result =
+ new (AllocWithArena(sizeof (*result), meta_data_arena)) Arena(flags);
+ return result;
+}
+
+// L < arena->mu, L < arena->arena->mu
+bool LowLevelAlloc::DeleteArena(Arena *arena) {
+ ABSL_RAW_CHECK(
+ arena != nullptr && arena != DefaultArena() && arena != UnhookedArena(),
+ "may not delete default arena");
+ ArenaLock section(arena);
+ if (arena->allocation_count != 0) {
+ section.Leave();
+ return false;
+ }
+ while (arena->freelist.next[0] != nullptr) {
+ AllocList *region = arena->freelist.next[0];
+ size_t size = region->header.size;
+ arena->freelist.next[0] = region->next[0];
+ ABSL_RAW_CHECK(
+ region->header.magic == Magic(kMagicUnallocated, ®ion->header),
+ "bad magic number in DeleteArena()");
+ ABSL_RAW_CHECK(region->header.arena == arena,
+ "bad arena pointer in DeleteArena()");
+ ABSL_RAW_CHECK(size % arena->pagesize == 0,
+ "empty arena has non-page-aligned block size");
+ ABSL_RAW_CHECK(reinterpret_cast<uintptr_t>(region) % arena->pagesize == 0,
+ "empty arena has non-page-aligned block");
+ int munmap_result;
+#ifdef _WIN32
+ munmap_result = VirtualFree(region, 0, MEM_RELEASE);
+ ABSL_RAW_CHECK(munmap_result != 0,
+ "LowLevelAlloc::DeleteArena: VitualFree failed");
+#else
+#ifndef ABSL_LOW_LEVEL_ALLOC_ASYNC_SIGNAL_SAFE_MISSING
+ if ((arena->flags & LowLevelAlloc::kAsyncSignalSafe) == 0) {
+ munmap_result = munmap(region, size);
+ } else {
+ munmap_result = base_internal::DirectMunmap(region, size);
+ }
+#else
+ munmap_result = munmap(region, size);
+#endif // ABSL_LOW_LEVEL_ALLOC_ASYNC_SIGNAL_SAFE_MISSING
+ if (munmap_result != 0) {
+ ABSL_RAW_LOG(FATAL, "LowLevelAlloc::DeleteArena: munmap failed: %d",
+ errno);
+ }
+#endif // _WIN32
+ }
+ section.Leave();
+ arena->~Arena();
+ Free(arena);
+ return true;
+}
+
+// ---------------------------------------------------------------------------
+
+// Addition, checking for overflow. The intent is to die if an external client
+// manages to push through a request that would cause arithmetic to fail.
+static inline uintptr_t CheckedAdd(uintptr_t a, uintptr_t b) {
+ uintptr_t sum = a + b;
+ ABSL_RAW_CHECK(sum >= a, "LowLevelAlloc arithmetic overflow");
+ return sum;
+}
+
+// Return value rounded up to next multiple of align.
+// align must be a power of two.
+static inline uintptr_t RoundUp(uintptr_t addr, uintptr_t align) {
+ return CheckedAdd(addr, align - 1) & ~(align - 1);
+}
+
+// Equivalent to "return prev->next[i]" but with sanity checking
+// that the freelist is in the correct order, that it
+// consists of regions marked "unallocated", and that no two regions
+// are adjacent in memory (they should have been coalesced).
+// L >= arena->mu
+static AllocList *Next(int i, AllocList *prev, LowLevelAlloc::Arena *arena) {
+ ABSL_RAW_CHECK(i < prev->levels, "too few levels in Next()");
+ AllocList *next = prev->next[i];
+ if (next != nullptr) {
+ ABSL_RAW_CHECK(
+ next->header.magic == Magic(kMagicUnallocated, &next->header),
+ "bad magic number in Next()");
+ ABSL_RAW_CHECK(next->header.arena == arena, "bad arena pointer in Next()");
+ if (prev != &arena->freelist) {
+ ABSL_RAW_CHECK(prev < next, "unordered freelist");
+ ABSL_RAW_CHECK(reinterpret_cast<char *>(prev) + prev->header.size <
+ reinterpret_cast<char *>(next),
+ "malformed freelist");
+ }
+ }
+ return next;
+}
+
+// Coalesce list item "a" with its successor if they are adjacent.
+static void Coalesce(AllocList *a) {
+ AllocList *n = a->next[0];
+ if (n != nullptr && reinterpret_cast<char *>(a) + a->header.size ==
+ reinterpret_cast<char *>(n)) {
+ LowLevelAlloc::Arena *arena = a->header.arena;
+ a->header.size += n->header.size;
+ n->header.magic = 0;
+ n->header.arena = nullptr;
+ AllocList *prev[kMaxLevel];
+ LLA_SkiplistDelete(&arena->freelist, n, prev);
+ LLA_SkiplistDelete(&arena->freelist, a, prev);
+ a->levels = LLA_SkiplistLevels(a->header.size, arena->min_size,
+ &arena->random);
+ LLA_SkiplistInsert(&arena->freelist, a, prev);
+ }
+}
+
+// Adds block at location "v" to the free list
+// L >= arena->mu
+static void AddToFreelist(void *v, LowLevelAlloc::Arena *arena) {
+ AllocList *f = reinterpret_cast<AllocList *>(
+ reinterpret_cast<char *>(v) - sizeof (f->header));
+ ABSL_RAW_CHECK(f->header.magic == Magic(kMagicAllocated, &f->header),
+ "bad magic number in AddToFreelist()");
+ ABSL_RAW_CHECK(f->header.arena == arena,
+ "bad arena pointer in AddToFreelist()");
+ f->levels = LLA_SkiplistLevels(f->header.size, arena->min_size,
+ &arena->random);
+ AllocList *prev[kMaxLevel];
+ LLA_SkiplistInsert(&arena->freelist, f, prev);
+ f->header.magic = Magic(kMagicUnallocated, &f->header);
+ Coalesce(f); // maybe coalesce with successor
+ Coalesce(prev[0]); // maybe coalesce with predecessor
+}
+
+// Frees storage allocated by LowLevelAlloc::Alloc().
+// L < arena->mu
+void LowLevelAlloc::Free(void *v) {
+ if (v != nullptr) {
+ AllocList *f = reinterpret_cast<AllocList *>(
+ reinterpret_cast<char *>(v) - sizeof (f->header));
+ LowLevelAlloc::Arena *arena = f->header.arena;
+ ArenaLock section(arena);
+ AddToFreelist(v, arena);
+ ABSL_RAW_CHECK(arena->allocation_count > 0, "nothing in arena to free");
+ arena->allocation_count--;
+ section.Leave();
+ }
+}
+
+// allocates and returns a block of size bytes, to be freed with Free()
+// L < arena->mu
+static void *DoAllocWithArena(size_t request, LowLevelAlloc::Arena *arena) {
+ void *result = nullptr;
+ if (request != 0) {
+ AllocList *s; // will point to region that satisfies request
+ ArenaLock section(arena);
+ // round up with header
+ size_t req_rnd = RoundUp(CheckedAdd(request, sizeof (s->header)),
+ arena->round_up);
+ for (;;) { // loop until we find a suitable region
+ // find the minimum levels that a block of this size must have
+ int i = LLA_SkiplistLevels(req_rnd, arena->min_size, nullptr) - 1;
+ if (i < arena->freelist.levels) { // potential blocks exist
+ AllocList *before = &arena->freelist; // predecessor of s
+ while ((s = Next(i, before, arena)) != nullptr &&
+ s->header.size < req_rnd) {
+ before = s;
+ }
+ if (s != nullptr) { // we found a region
+ break;
+ }
+ }
+ // we unlock before mmap() both because mmap() may call a callback hook,
+ // and because it may be slow.
+ arena->mu.Unlock();
+ // mmap generous 64K chunks to decrease
+ // the chances/impact of fragmentation:
+ size_t new_pages_size = RoundUp(req_rnd, arena->pagesize * 16);
+ void *new_pages;
+#ifdef _WIN32
+ new_pages = VirtualAlloc(0, new_pages_size,
+ MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
+ ABSL_RAW_CHECK(new_pages != nullptr, "VirtualAlloc failed");
+#else
+#ifndef ABSL_LOW_LEVEL_ALLOC_ASYNC_SIGNAL_SAFE_MISSING
+ if ((arena->flags & LowLevelAlloc::kAsyncSignalSafe) != 0) {
+ new_pages = base_internal::DirectMmap(nullptr, new_pages_size,
+ PROT_WRITE|PROT_READ, MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
+ } else {
+ new_pages = mmap(nullptr, new_pages_size, PROT_WRITE | PROT_READ,
+ MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
+ }
+#else
+ new_pages = mmap(nullptr, new_pages_size, PROT_WRITE | PROT_READ,
+ MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
+#endif // ABSL_LOW_LEVEL_ALLOC_ASYNC_SIGNAL_SAFE_MISSING
+ if (new_pages == MAP_FAILED) {
+ ABSL_RAW_LOG(FATAL, "mmap error: %d", errno);
+ }
+
+#endif // _WIN32
+ arena->mu.Lock();
+ s = reinterpret_cast<AllocList *>(new_pages);
+ s->header.size = new_pages_size;
+ // Pretend the block is allocated; call AddToFreelist() to free it.
+ s->header.magic = Magic(kMagicAllocated, &s->header);
+ s->header.arena = arena;
+ AddToFreelist(&s->levels, arena); // insert new region into free list
+ }
+ AllocList *prev[kMaxLevel];
+ LLA_SkiplistDelete(&arena->freelist, s, prev); // remove from free list
+ // s points to the first free region that's big enough
+ if (CheckedAdd(req_rnd, arena->min_size) <= s->header.size) {
+ // big enough to split
+ AllocList *n = reinterpret_cast<AllocList *>
+ (req_rnd + reinterpret_cast<char *>(s));
+ n->header.size = s->header.size - req_rnd;
+ n->header.magic = Magic(kMagicAllocated, &n->header);
+ n->header.arena = arena;
+ s->header.size = req_rnd;
+ AddToFreelist(&n->levels, arena);
+ }
+ s->header.magic = Magic(kMagicAllocated, &s->header);
+ ABSL_RAW_CHECK(s->header.arena == arena, "");
+ arena->allocation_count++;
+ section.Leave();
+ result = &s->levels;
+ }
+ ABSL_ANNOTATE_MEMORY_IS_UNINITIALIZED(result, request);
+ return result;
+}
+
+void *LowLevelAlloc::Alloc(size_t request) {
+ void *result = DoAllocWithArena(request, DefaultArena());
+ return result;
+}
+
+void *LowLevelAlloc::AllocWithArena(size_t request, Arena *arena) {
+ ABSL_RAW_CHECK(arena != nullptr, "must pass a valid arena");
+ void *result = DoAllocWithArena(request, arena);
+ return result;
+}
+
+} // namespace base_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_LOW_LEVEL_ALLOC_MISSING
diff --git a/third_party/abseil/src/absl/base/internal/low_level_alloc.h b/third_party/abseil/src/absl/base/internal/low_level_alloc.h
new file mode 100644
index 0000000..db91951
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/low_level_alloc.h
@@ -0,0 +1,126 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+#ifndef ABSL_BASE_INTERNAL_LOW_LEVEL_ALLOC_H_
+#define ABSL_BASE_INTERNAL_LOW_LEVEL_ALLOC_H_
+
+// A simple thread-safe memory allocator that does not depend on
+// mutexes or thread-specific data. It is intended to be used
+// sparingly, and only when malloc() would introduce an unwanted
+// dependency, such as inside the heap-checker, or the Mutex
+// implementation.
+
+// IWYU pragma: private, include "base/low_level_alloc.h"
+
+#include <sys/types.h>
+
+#include <cstdint>
+
+#include "absl/base/attributes.h"
+#include "absl/base/config.h"
+
+// LowLevelAlloc requires that the platform support low-level
+// allocation of virtual memory. Platforms lacking this cannot use
+// LowLevelAlloc.
+#ifdef ABSL_LOW_LEVEL_ALLOC_MISSING
+#error ABSL_LOW_LEVEL_ALLOC_MISSING cannot be directly set
+#elif !defined(ABSL_HAVE_MMAP) && !defined(_WIN32)
+#define ABSL_LOW_LEVEL_ALLOC_MISSING 1
+#endif
+
+// Using LowLevelAlloc with kAsyncSignalSafe isn't supported on Windows or
+// asm.js / WebAssembly.
+// See https://kripken.github.io/emscripten-site/docs/porting/pthreads.html
+// for more information.
+#ifdef ABSL_LOW_LEVEL_ALLOC_ASYNC_SIGNAL_SAFE_MISSING
+#error ABSL_LOW_LEVEL_ALLOC_ASYNC_SIGNAL_SAFE_MISSING cannot be directly set
+#elif defined(_WIN32) || defined(__asmjs__) || defined(__wasm__)
+#define ABSL_LOW_LEVEL_ALLOC_ASYNC_SIGNAL_SAFE_MISSING 1
+#endif
+
+#include <cstddef>
+
+#include "absl/base/port.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace base_internal {
+
+class LowLevelAlloc {
+ public:
+ struct Arena; // an arena from which memory may be allocated
+
+ // Returns a pointer to a block of at least "request" bytes
+ // that have been newly allocated from the specific arena.
+ // for Alloc() call the DefaultArena() is used.
+ // Returns 0 if passed request==0.
+ // Does not return 0 under other circumstances; it crashes if memory
+ // is not available.
+ static void *Alloc(size_t request) ABSL_ATTRIBUTE_SECTION(malloc_hook);
+ static void *AllocWithArena(size_t request, Arena *arena)
+ ABSL_ATTRIBUTE_SECTION(malloc_hook);
+
+ // Deallocates a region of memory that was previously allocated with
+ // Alloc(). Does nothing if passed 0. "s" must be either 0,
+ // or must have been returned from a call to Alloc() and not yet passed to
+ // Free() since that call to Alloc(). The space is returned to the arena
+ // from which it was allocated.
+ static void Free(void *s) ABSL_ATTRIBUTE_SECTION(malloc_hook);
+
+ // ABSL_ATTRIBUTE_SECTION(malloc_hook) for Alloc* and Free
+ // are to put all callers of MallocHook::Invoke* in this module
+ // into special section,
+ // so that MallocHook::GetCallerStackTrace can function accurately.
+
+ // Create a new arena.
+ // The root metadata for the new arena is allocated in the
+ // meta_data_arena; the DefaultArena() can be passed for meta_data_arena.
+ // These values may be ored into flags:
+ enum {
+ // Report calls to Alloc() and Free() via the MallocHook interface.
+ // Set in the DefaultArena.
+ kCallMallocHook = 0x0001,
+
+#ifndef ABSL_LOW_LEVEL_ALLOC_ASYNC_SIGNAL_SAFE_MISSING
+ // Make calls to Alloc(), Free() be async-signal-safe. Not set in
+ // DefaultArena(). Not supported on all platforms.
+ kAsyncSignalSafe = 0x0002,
+#endif
+ };
+ // Construct a new arena. The allocation of the underlying metadata honors
+ // the provided flags. For example, the call NewArena(kAsyncSignalSafe)
+ // is itself async-signal-safe, as well as generatating an arena that provides
+ // async-signal-safe Alloc/Free.
+ static Arena *NewArena(int32_t flags);
+
+ // Destroys an arena allocated by NewArena and returns true,
+ // provided no allocated blocks remain in the arena.
+ // If allocated blocks remain in the arena, does nothing and
+ // returns false.
+ // It is illegal to attempt to destroy the DefaultArena().
+ static bool DeleteArena(Arena *arena);
+
+ // The default arena that always exists.
+ static Arena *DefaultArena();
+
+ private:
+ LowLevelAlloc(); // no instances
+};
+
+} // namespace base_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_BASE_INTERNAL_LOW_LEVEL_ALLOC_H_
diff --git a/third_party/abseil/src/absl/base/internal/low_level_alloc_test.cc b/third_party/abseil/src/absl/base/internal/low_level_alloc_test.cc
new file mode 100644
index 0000000..2f2eaff
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/low_level_alloc_test.cc
@@ -0,0 +1,162 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/base/internal/low_level_alloc.h"
+
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <thread> // NOLINT(build/c++11)
+#include <unordered_map>
+#include <utility>
+
+#include "absl/container/node_hash_map.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace base_internal {
+namespace {
+
+// This test doesn't use gtest since it needs to test that everything
+// works before main().
+#define TEST_ASSERT(x) \
+ if (!(x)) { \
+ printf("TEST_ASSERT(%s) FAILED ON LINE %d\n", #x, __LINE__); \
+ abort(); \
+ }
+
+// a block of memory obtained from the allocator
+struct BlockDesc {
+ char *ptr; // pointer to memory
+ int len; // number of bytes
+ int fill; // filled with data starting with this
+};
+
+// Check that the pattern placed in the block d
+// by RandomizeBlockDesc is still there.
+static void CheckBlockDesc(const BlockDesc &d) {
+ for (int i = 0; i != d.len; i++) {
+ TEST_ASSERT((d.ptr[i] & 0xff) == ((d.fill + i) & 0xff));
+ }
+}
+
+// Fill the block "*d" with a pattern
+// starting with a random byte.
+static void RandomizeBlockDesc(BlockDesc *d) {
+ d->fill = rand() & 0xff;
+ for (int i = 0; i != d->len; i++) {
+ d->ptr[i] = (d->fill + i) & 0xff;
+ }
+}
+
+// Use to indicate to the malloc hooks that
+// this calls is from LowLevelAlloc.
+static bool using_low_level_alloc = false;
+
+// n times, toss a coin, and based on the outcome
+// either allocate a new block or deallocate an old block.
+// New blocks are placed in a std::unordered_map with a random key
+// and initialized with RandomizeBlockDesc().
+// If keys conflict, the older block is freed.
+// Old blocks are always checked with CheckBlockDesc()
+// before being freed. At the end of the run,
+// all remaining allocated blocks are freed.
+// If use_new_arena is true, use a fresh arena, and then delete it.
+// If call_malloc_hook is true and user_arena is true,
+// allocations and deallocations are reported via the MallocHook
+// interface.
+static void Test(bool use_new_arena, bool call_malloc_hook, int n) {
+ typedef absl::node_hash_map<int, BlockDesc> AllocMap;
+ AllocMap allocated;
+ AllocMap::iterator it;
+ BlockDesc block_desc;
+ int rnd;
+ LowLevelAlloc::Arena *arena = 0;
+ if (use_new_arena) {
+ int32_t flags = call_malloc_hook ? LowLevelAlloc::kCallMallocHook : 0;
+ arena = LowLevelAlloc::NewArena(flags);
+ }
+ for (int i = 0; i != n; i++) {
+ if (i != 0 && i % 10000 == 0) {
+ printf(".");
+ fflush(stdout);
+ }
+
+ switch (rand() & 1) { // toss a coin
+ case 0: // coin came up heads: add a block
+ using_low_level_alloc = true;
+ block_desc.len = rand() & 0x3fff;
+ block_desc.ptr =
+ reinterpret_cast<char *>(
+ arena == 0
+ ? LowLevelAlloc::Alloc(block_desc.len)
+ : LowLevelAlloc::AllocWithArena(block_desc.len, arena));
+ using_low_level_alloc = false;
+ RandomizeBlockDesc(&block_desc);
+ rnd = rand();
+ it = allocated.find(rnd);
+ if (it != allocated.end()) {
+ CheckBlockDesc(it->second);
+ using_low_level_alloc = true;
+ LowLevelAlloc::Free(it->second.ptr);
+ using_low_level_alloc = false;
+ it->second = block_desc;
+ } else {
+ allocated[rnd] = block_desc;
+ }
+ break;
+ case 1: // coin came up tails: remove a block
+ it = allocated.begin();
+ if (it != allocated.end()) {
+ CheckBlockDesc(it->second);
+ using_low_level_alloc = true;
+ LowLevelAlloc::Free(it->second.ptr);
+ using_low_level_alloc = false;
+ allocated.erase(it);
+ }
+ break;
+ }
+ }
+ // remove all remaining blocks
+ while ((it = allocated.begin()) != allocated.end()) {
+ CheckBlockDesc(it->second);
+ using_low_level_alloc = true;
+ LowLevelAlloc::Free(it->second.ptr);
+ using_low_level_alloc = false;
+ allocated.erase(it);
+ }
+ if (use_new_arena) {
+ TEST_ASSERT(LowLevelAlloc::DeleteArena(arena));
+ }
+}
+
+// LowLevelAlloc is designed to be safe to call before main().
+static struct BeforeMain {
+ BeforeMain() {
+ Test(false, false, 50000);
+ Test(true, false, 50000);
+ Test(true, true, 50000);
+ }
+} before_main;
+
+} // namespace
+} // namespace base_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+int main(int argc, char *argv[]) {
+ // The actual test runs in the global constructor of `before_main`.
+ printf("PASS\n");
+ return 0;
+}
diff --git a/third_party/abseil/src/absl/base/internal/low_level_scheduling.h b/third_party/abseil/src/absl/base/internal/low_level_scheduling.h
new file mode 100644
index 0000000..9baccc0
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/low_level_scheduling.h
@@ -0,0 +1,134 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// Core interfaces and definitions used by by low-level interfaces such as
+// SpinLock.
+
+#ifndef ABSL_BASE_INTERNAL_LOW_LEVEL_SCHEDULING_H_
+#define ABSL_BASE_INTERNAL_LOW_LEVEL_SCHEDULING_H_
+
+#include "absl/base/internal/raw_logging.h"
+#include "absl/base/internal/scheduling_mode.h"
+#include "absl/base/macros.h"
+
+// The following two declarations exist so SchedulingGuard may friend them with
+// the appropriate language linkage. These callbacks allow libc internals, such
+// as function level statics, to schedule cooperatively when locking.
+extern "C" bool __google_disable_rescheduling(void);
+extern "C" void __google_enable_rescheduling(bool disable_result);
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+class CondVar;
+class Mutex;
+
+namespace synchronization_internal {
+int MutexDelay(int32_t c, int mode);
+} // namespace synchronization_internal
+
+namespace base_internal {
+
+class SchedulingHelper; // To allow use of SchedulingGuard.
+class SpinLock; // To allow use of SchedulingGuard.
+
+// SchedulingGuard
+// Provides guard semantics that may be used to disable cooperative rescheduling
+// of the calling thread within specific program blocks. This is used to
+// protect resources (e.g. low-level SpinLocks or Domain code) that cooperative
+// scheduling depends on.
+//
+// Domain implementations capable of rescheduling in reaction to involuntary
+// kernel thread actions (e.g blocking due to a pagefault or syscall) must
+// guarantee that an annotated thread is not allowed to (cooperatively)
+// reschedule until the annotated region is complete.
+//
+// It is an error to attempt to use a cooperatively scheduled resource (e.g.
+// Mutex) within a rescheduling-disabled region.
+//
+// All methods are async-signal safe.
+class SchedulingGuard {
+ public:
+ // Returns true iff the calling thread may be cooperatively rescheduled.
+ static bool ReschedulingIsAllowed();
+ SchedulingGuard(const SchedulingGuard&) = delete;
+ SchedulingGuard& operator=(const SchedulingGuard&) = delete;
+
+ private:
+ // Disable cooperative rescheduling of the calling thread. It may still
+ // initiate scheduling operations (e.g. wake-ups), however, it may not itself
+ // reschedule. Nestable. The returned result is opaque, clients should not
+ // attempt to interpret it.
+ // REQUIRES: Result must be passed to a pairing EnableScheduling().
+ static bool DisableRescheduling();
+
+ // Marks the end of a rescheduling disabled region, previously started by
+ // DisableRescheduling().
+ // REQUIRES: Pairs with innermost call (and result) of DisableRescheduling().
+ static void EnableRescheduling(bool disable_result);
+
+ // A scoped helper for {Disable, Enable}Rescheduling().
+ // REQUIRES: destructor must run in same thread as constructor.
+ struct ScopedDisable {
+ ScopedDisable() { disabled = SchedulingGuard::DisableRescheduling(); }
+ ~ScopedDisable() { SchedulingGuard::EnableRescheduling(disabled); }
+
+ bool disabled;
+ };
+
+ // A scoped helper to enable rescheduling temporarily.
+ // REQUIRES: destructor must run in same thread as constructor.
+ class ScopedEnable {
+ public:
+ ScopedEnable();
+ ~ScopedEnable();
+
+ private:
+ int scheduling_disabled_depth_;
+ };
+
+ // Access to SchedulingGuard is explicitly permitted.
+ friend class absl::CondVar;
+ friend class absl::Mutex;
+ friend class SchedulingHelper;
+ friend class SpinLock;
+ friend int absl::synchronization_internal::MutexDelay(int32_t c, int mode);
+};
+
+//------------------------------------------------------------------------------
+// End of public interfaces.
+//------------------------------------------------------------------------------
+
+inline bool SchedulingGuard::ReschedulingIsAllowed() {
+ return false;
+}
+
+inline bool SchedulingGuard::DisableRescheduling() {
+ return false;
+}
+
+inline void SchedulingGuard::EnableRescheduling(bool /* disable_result */) {
+ return;
+}
+
+inline SchedulingGuard::ScopedEnable::ScopedEnable()
+ : scheduling_disabled_depth_(0) {}
+inline SchedulingGuard::ScopedEnable::~ScopedEnable() {
+ ABSL_RAW_CHECK(scheduling_disabled_depth_ == 0, "disable unused warning");
+}
+
+} // namespace base_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_BASE_INTERNAL_LOW_LEVEL_SCHEDULING_H_
diff --git a/third_party/abseil/src/absl/base/internal/per_thread_tls.h b/third_party/abseil/src/absl/base/internal/per_thread_tls.h
new file mode 100644
index 0000000..cf5e97a
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/per_thread_tls.h
@@ -0,0 +1,52 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_BASE_INTERNAL_PER_THREAD_TLS_H_
+#define ABSL_BASE_INTERNAL_PER_THREAD_TLS_H_
+
+// This header defines two macros:
+//
+// If the platform supports thread-local storage:
+//
+// * ABSL_PER_THREAD_TLS_KEYWORD is the C keyword needed to declare a
+// thread-local variable
+// * ABSL_PER_THREAD_TLS is 1
+//
+// Otherwise:
+//
+// * ABSL_PER_THREAD_TLS_KEYWORD is empty
+// * ABSL_PER_THREAD_TLS is 0
+//
+// Microsoft C supports thread-local storage.
+// GCC supports it if the appropriate version of glibc is available,
+// which the programmer can indicate by defining ABSL_HAVE_TLS
+
+#include "absl/base/port.h" // For ABSL_HAVE_TLS
+
+#if defined(ABSL_PER_THREAD_TLS)
+#error ABSL_PER_THREAD_TLS cannot be directly set
+#elif defined(ABSL_PER_THREAD_TLS_KEYWORD)
+#error ABSL_PER_THREAD_TLS_KEYWORD cannot be directly set
+#elif defined(ABSL_HAVE_TLS)
+#define ABSL_PER_THREAD_TLS_KEYWORD __thread
+#define ABSL_PER_THREAD_TLS 1
+#elif defined(_MSC_VER)
+#define ABSL_PER_THREAD_TLS_KEYWORD __declspec(thread)
+#define ABSL_PER_THREAD_TLS 1
+#else
+#define ABSL_PER_THREAD_TLS_KEYWORD
+#define ABSL_PER_THREAD_TLS 0
+#endif
+
+#endif // ABSL_BASE_INTERNAL_PER_THREAD_TLS_H_
diff --git a/third_party/abseil/src/absl/base/internal/periodic_sampler.cc b/third_party/abseil/src/absl/base/internal/periodic_sampler.cc
new file mode 100644
index 0000000..520dabb
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/periodic_sampler.cc
@@ -0,0 +1,53 @@
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/base/internal/periodic_sampler.h"
+
+#include <atomic>
+
+#include "absl/base/internal/exponential_biased.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace base_internal {
+
+int64_t PeriodicSamplerBase::GetExponentialBiased(int period) noexcept {
+ return rng_.GetStride(period);
+}
+
+bool PeriodicSamplerBase::SubtleConfirmSample() noexcept {
+ int current_period = period();
+
+ // Deal with period case 0 (always off) and 1 (always on)
+ if (ABSL_PREDICT_FALSE(current_period < 2)) {
+ stride_ = 0;
+ return current_period == 1;
+ }
+
+ // Check if this is the first call to Sample()
+ if (ABSL_PREDICT_FALSE(stride_ == 1)) {
+ stride_ = static_cast<uint64_t>(-GetExponentialBiased(current_period));
+ if (static_cast<int64_t>(stride_) < -1) {
+ ++stride_;
+ return false;
+ }
+ }
+
+ stride_ = static_cast<uint64_t>(-GetExponentialBiased(current_period));
+ return true;
+}
+
+} // namespace base_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/base/internal/periodic_sampler.h b/third_party/abseil/src/absl/base/internal/periodic_sampler.h
new file mode 100644
index 0000000..f8a8679
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/periodic_sampler.h
@@ -0,0 +1,211 @@
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_BASE_INTERNAL_PERIODIC_SAMPLER_H_
+#define ABSL_BASE_INTERNAL_PERIODIC_SAMPLER_H_
+
+#include <stdint.h>
+
+#include <atomic>
+
+#include "absl/base/internal/exponential_biased.h"
+#include "absl/base/optimization.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace base_internal {
+
+// PeriodicSamplerBase provides the basic period sampler implementation.
+//
+// This is the base class for the templated PeriodicSampler class, which holds
+// a global std::atomic value identified by a user defined tag, such that
+// each specific PeriodSampler implementation holds its own global period.
+//
+// PeriodicSamplerBase is thread-compatible except where stated otherwise.
+class PeriodicSamplerBase {
+ public:
+ // PeriodicSamplerBase is trivial / copyable / movable / destructible.
+ PeriodicSamplerBase() = default;
+ PeriodicSamplerBase(PeriodicSamplerBase&&) = default;
+ PeriodicSamplerBase(const PeriodicSamplerBase&) = default;
+
+ // Returns true roughly once every `period` calls. This is established by a
+ // randomly picked `stride` that is counted down on each call to `Sample`.
+ // This stride is picked such that the probability of `Sample()` returning
+ // true is 1 in `period`.
+ inline bool Sample() noexcept;
+
+ // The below methods are intended for optimized use cases where the
+ // size of the inlined fast path code is highly important. Applications
+ // should use the `Sample()` method unless they have proof that their
+ // specific use case requires the optimizations offered by these methods.
+ //
+ // An example of such a use case is SwissTable sampling. All sampling checks
+ // are in inlined SwissTable methods, and the number of call sites is huge.
+ // In this case, the inlined code size added to each translation unit calling
+ // SwissTable methods is non-trivial.
+ //
+ // The `SubtleMaybeSample()` function spuriously returns true even if the
+ // function should not be sampled, applications MUST match each call to
+ // 'SubtleMaybeSample()' returning true with a `SubtleConfirmSample()` call,
+ // and use the result of the latter as the sampling decision.
+ // In other words: the code should logically be equivalent to:
+ //
+ // if (SubtleMaybeSample() && SubtleConfirmSample()) {
+ // // Sample this call
+ // }
+ //
+ // In the 'inline-size' optimized case, the `SubtleConfirmSample()` call can
+ // be placed out of line, for example, the typical use case looks as follows:
+ //
+ // // --- frobber.h -----------
+ // void FrobberSampled();
+ //
+ // inline void FrobberImpl() {
+ // // ...
+ // }
+ //
+ // inline void Frobber() {
+ // if (ABSL_PREDICT_FALSE(sampler.SubtleMaybeSample())) {
+ // FrobberSampled();
+ // } else {
+ // FrobberImpl();
+ // }
+ // }
+ //
+ // // --- frobber.cc -----------
+ // void FrobberSampled() {
+ // if (!sampler.SubtleConfirmSample())) {
+ // // Spurious false positive
+ // FrobberImpl();
+ // return;
+ // }
+ //
+ // // Sampled execution
+ // // ...
+ // }
+ inline bool SubtleMaybeSample() noexcept;
+ bool SubtleConfirmSample() noexcept;
+
+ protected:
+ // We explicitly don't use a virtual destructor as this class is never
+ // virtually destroyed, and it keeps the class trivial, which avoids TLS
+ // prologue and epilogue code for our TLS instances.
+ ~PeriodicSamplerBase() = default;
+
+ // Returns the next stride for our sampler.
+ // This function is virtual for testing purposes only.
+ virtual int64_t GetExponentialBiased(int period) noexcept;
+
+ private:
+ // Returns the current period of this sampler. Thread-safe.
+ virtual int period() const noexcept = 0;
+
+ // Keep and decrement stride_ as an unsigned integer, but compare the value
+ // to zero casted as a signed int. clang and msvc do not create optimum code
+ // if we use signed for the combined decrement and sign comparison.
+ //
+ // Below 3 alternative options, all compiles generate the best code
+ // using the unsigned increment <---> signed int comparison option.
+ //
+ // Option 1:
+ // int64_t stride_;
+ // if (ABSL_PREDICT_TRUE(++stride_ < 0)) { ... }
+ //
+ // GCC x64 (OK) : https://gcc.godbolt.org/z/R5MzzA
+ // GCC ppc (OK) : https://gcc.godbolt.org/z/z7NZAt
+ // Clang x64 (BAD): https://gcc.godbolt.org/z/t4gPsd
+ // ICC x64 (OK) : https://gcc.godbolt.org/z/rE6s8W
+ // MSVC x64 (OK) : https://gcc.godbolt.org/z/ARMXqS
+ //
+ // Option 2:
+ // int64_t stride_ = 0;
+ // if (ABSL_PREDICT_TRUE(--stride_ >= 0)) { ... }
+ //
+ // GCC x64 (OK) : https://gcc.godbolt.org/z/jSQxYK
+ // GCC ppc (OK) : https://gcc.godbolt.org/z/VJdYaA
+ // Clang x64 (BAD): https://gcc.godbolt.org/z/Xm4NjX
+ // ICC x64 (OK) : https://gcc.godbolt.org/z/4snaFd
+ // MSVC x64 (BAD): https://gcc.godbolt.org/z/BgnEKE
+ //
+ // Option 3:
+ // uint64_t stride_;
+ // if (ABSL_PREDICT_TRUE(static_cast<int64_t>(++stride_) < 0)) { ... }
+ //
+ // GCC x64 (OK) : https://gcc.godbolt.org/z/bFbfPy
+ // GCC ppc (OK) : https://gcc.godbolt.org/z/S9KkUE
+ // Clang x64 (OK) : https://gcc.godbolt.org/z/UYzRb4
+ // ICC x64 (OK) : https://gcc.godbolt.org/z/ptTNfD
+ // MSVC x64 (OK) : https://gcc.godbolt.org/z/76j4-5
+ uint64_t stride_ = 0;
+ ExponentialBiased rng_;
+};
+
+inline bool PeriodicSamplerBase::SubtleMaybeSample() noexcept {
+ // See comments on `stride_` for the unsigned increment / signed compare.
+ if (ABSL_PREDICT_TRUE(static_cast<int64_t>(++stride_) < 0)) {
+ return false;
+ }
+ return true;
+}
+
+inline bool PeriodicSamplerBase::Sample() noexcept {
+ return ABSL_PREDICT_FALSE(SubtleMaybeSample()) ? SubtleConfirmSample()
+ : false;
+}
+
+// PeriodicSampler is a concreted periodic sampler implementation.
+// The user provided Tag identifies the implementation, and is required to
+// isolate the global state of this instance from other instances.
+//
+// Typical use case:
+//
+// struct HashTablezTag {};
+// thread_local PeriodicSampler sampler;
+//
+// void HashTableSamplingLogic(...) {
+// if (sampler.Sample()) {
+// HashTableSlowSamplePath(...);
+// }
+// }
+//
+template <typename Tag, int default_period = 0>
+class PeriodicSampler final : public PeriodicSamplerBase {
+ public:
+ ~PeriodicSampler() = default;
+
+ int period() const noexcept final {
+ return period_.load(std::memory_order_relaxed);
+ }
+
+ // Sets the global period for this sampler. Thread-safe.
+ // Setting a period of 0 disables the sampler, i.e., every call to Sample()
+ // will return false. Setting a period of 1 puts the sampler in 'always on'
+ // mode, i.e., every call to Sample() returns true.
+ static void SetGlobalPeriod(int period) {
+ period_.store(period, std::memory_order_relaxed);
+ }
+
+ private:
+ static std::atomic<int> period_;
+};
+
+template <typename Tag, int default_period>
+std::atomic<int> PeriodicSampler<Tag, default_period>::period_(default_period);
+
+} // namespace base_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_BASE_INTERNAL_PERIODIC_SAMPLER_H_
diff --git a/third_party/abseil/src/absl/base/internal/periodic_sampler_benchmark.cc b/third_party/abseil/src/absl/base/internal/periodic_sampler_benchmark.cc
new file mode 100644
index 0000000..5ad469c
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/periodic_sampler_benchmark.cc
@@ -0,0 +1,79 @@
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "benchmark/benchmark.h"
+#include "absl/base/internal/periodic_sampler.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace base_internal {
+namespace {
+
+template <typename Sampler>
+void BM_Sample(Sampler* sampler, benchmark::State& state) {
+ for (auto _ : state) {
+ benchmark::DoNotOptimize(sampler);
+ benchmark::DoNotOptimize(sampler->Sample());
+ }
+}
+
+template <typename Sampler>
+void BM_SampleMinunumInlined(Sampler* sampler, benchmark::State& state) {
+ for (auto _ : state) {
+ benchmark::DoNotOptimize(sampler);
+ if (ABSL_PREDICT_FALSE(sampler->SubtleMaybeSample())) {
+ benchmark::DoNotOptimize(sampler->SubtleConfirmSample());
+ }
+ }
+}
+
+void BM_PeriodicSampler_TinySample(benchmark::State& state) {
+ struct Tag {};
+ PeriodicSampler<Tag, 10> sampler;
+ BM_Sample(&sampler, state);
+}
+BENCHMARK(BM_PeriodicSampler_TinySample);
+
+void BM_PeriodicSampler_ShortSample(benchmark::State& state) {
+ struct Tag {};
+ PeriodicSampler<Tag, 1024> sampler;
+ BM_Sample(&sampler, state);
+}
+BENCHMARK(BM_PeriodicSampler_ShortSample);
+
+void BM_PeriodicSampler_LongSample(benchmark::State& state) {
+ struct Tag {};
+ PeriodicSampler<Tag, 1024 * 1024> sampler;
+ BM_Sample(&sampler, state);
+}
+BENCHMARK(BM_PeriodicSampler_LongSample);
+
+void BM_PeriodicSampler_LongSampleMinunumInlined(benchmark::State& state) {
+ struct Tag {};
+ PeriodicSampler<Tag, 1024 * 1024> sampler;
+ BM_SampleMinunumInlined(&sampler, state);
+}
+BENCHMARK(BM_PeriodicSampler_LongSampleMinunumInlined);
+
+void BM_PeriodicSampler_Disabled(benchmark::State& state) {
+ struct Tag {};
+ PeriodicSampler<Tag, 0> sampler;
+ BM_Sample(&sampler, state);
+}
+BENCHMARK(BM_PeriodicSampler_Disabled);
+
+} // namespace
+} // namespace base_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/base/internal/periodic_sampler_test.cc b/third_party/abseil/src/absl/base/internal/periodic_sampler_test.cc
new file mode 100644
index 0000000..3b301e3
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/periodic_sampler_test.cc
@@ -0,0 +1,177 @@
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/base/internal/periodic_sampler.h"
+
+#include <thread> // NOLINT(build/c++11)
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/base/attributes.h"
+#include "absl/base/macros.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace base_internal {
+namespace {
+
+using testing::Eq;
+using testing::Return;
+using testing::StrictMock;
+
+class MockPeriodicSampler : public PeriodicSamplerBase {
+ public:
+ virtual ~MockPeriodicSampler() = default;
+
+ MOCK_METHOD(int, period, (), (const, noexcept));
+ MOCK_METHOD(int64_t, GetExponentialBiased, (int), (noexcept));
+};
+
+TEST(PeriodicSamplerBaseTest, Sample) {
+ StrictMock<MockPeriodicSampler> sampler;
+
+ EXPECT_CALL(sampler, period()).Times(3).WillRepeatedly(Return(16));
+ EXPECT_CALL(sampler, GetExponentialBiased(16))
+ .WillOnce(Return(2))
+ .WillOnce(Return(3))
+ .WillOnce(Return(4));
+
+ EXPECT_FALSE(sampler.Sample());
+ EXPECT_TRUE(sampler.Sample());
+
+ EXPECT_FALSE(sampler.Sample());
+ EXPECT_FALSE(sampler.Sample());
+ EXPECT_TRUE(sampler.Sample());
+
+ EXPECT_FALSE(sampler.Sample());
+ EXPECT_FALSE(sampler.Sample());
+ EXPECT_FALSE(sampler.Sample());
+}
+
+TEST(PeriodicSamplerBaseTest, ImmediatelySample) {
+ StrictMock<MockPeriodicSampler> sampler;
+
+ EXPECT_CALL(sampler, period()).Times(2).WillRepeatedly(Return(16));
+ EXPECT_CALL(sampler, GetExponentialBiased(16))
+ .WillOnce(Return(1))
+ .WillOnce(Return(2))
+ .WillOnce(Return(3));
+
+ EXPECT_TRUE(sampler.Sample());
+
+ EXPECT_FALSE(sampler.Sample());
+ EXPECT_TRUE(sampler.Sample());
+
+ EXPECT_FALSE(sampler.Sample());
+ EXPECT_FALSE(sampler.Sample());
+}
+
+TEST(PeriodicSamplerBaseTest, Disabled) {
+ StrictMock<MockPeriodicSampler> sampler;
+
+ EXPECT_CALL(sampler, period()).Times(3).WillRepeatedly(Return(0));
+
+ EXPECT_FALSE(sampler.Sample());
+ EXPECT_FALSE(sampler.Sample());
+ EXPECT_FALSE(sampler.Sample());
+}
+
+TEST(PeriodicSamplerBaseTest, AlwaysOn) {
+ StrictMock<MockPeriodicSampler> sampler;
+
+ EXPECT_CALL(sampler, period()).Times(3).WillRepeatedly(Return(1));
+
+ EXPECT_TRUE(sampler.Sample());
+ EXPECT_TRUE(sampler.Sample());
+ EXPECT_TRUE(sampler.Sample());
+}
+
+TEST(PeriodicSamplerBaseTest, Disable) {
+ StrictMock<MockPeriodicSampler> sampler;
+
+ EXPECT_CALL(sampler, period()).WillOnce(Return(16));
+ EXPECT_CALL(sampler, GetExponentialBiased(16)).WillOnce(Return(3));
+ EXPECT_FALSE(sampler.Sample());
+ EXPECT_FALSE(sampler.Sample());
+
+ EXPECT_CALL(sampler, period()).Times(2).WillRepeatedly(Return(0));
+
+ EXPECT_FALSE(sampler.Sample());
+ EXPECT_FALSE(sampler.Sample());
+}
+
+TEST(PeriodicSamplerBaseTest, Enable) {
+ StrictMock<MockPeriodicSampler> sampler;
+
+ EXPECT_CALL(sampler, period()).WillOnce(Return(0));
+ EXPECT_FALSE(sampler.Sample());
+
+ EXPECT_CALL(sampler, period()).Times(2).WillRepeatedly(Return(16));
+ EXPECT_CALL(sampler, GetExponentialBiased(16))
+ .Times(2)
+ .WillRepeatedly(Return(3));
+
+ EXPECT_FALSE(sampler.Sample());
+ EXPECT_FALSE(sampler.Sample());
+ EXPECT_TRUE(sampler.Sample());
+
+ EXPECT_FALSE(sampler.Sample());
+ EXPECT_FALSE(sampler.Sample());
+}
+
+TEST(PeriodicSamplerTest, ConstructConstInit) {
+ struct Tag {};
+ ABSL_CONST_INIT static PeriodicSampler<Tag> sampler;
+ (void)sampler;
+}
+
+TEST(PeriodicSamplerTest, DefaultPeriod0) {
+ struct Tag {};
+ PeriodicSampler<Tag> sampler;
+ EXPECT_THAT(sampler.period(), Eq(0));
+}
+
+TEST(PeriodicSamplerTest, DefaultPeriod) {
+ struct Tag {};
+ PeriodicSampler<Tag, 100> sampler;
+ EXPECT_THAT(sampler.period(), Eq(100));
+}
+
+TEST(PeriodicSamplerTest, SetGlobalPeriod) {
+ struct Tag1 {};
+ struct Tag2 {};
+ PeriodicSampler<Tag1, 25> sampler1;
+ PeriodicSampler<Tag2, 50> sampler2;
+
+ EXPECT_THAT(sampler1.period(), Eq(25));
+ EXPECT_THAT(sampler2.period(), Eq(50));
+
+ std::thread thread([] {
+ PeriodicSampler<Tag1, 25> sampler1;
+ PeriodicSampler<Tag2, 50> sampler2;
+ EXPECT_THAT(sampler1.period(), Eq(25));
+ EXPECT_THAT(sampler2.period(), Eq(50));
+ sampler1.SetGlobalPeriod(10);
+ sampler2.SetGlobalPeriod(20);
+ });
+ thread.join();
+
+ EXPECT_THAT(sampler1.period(), Eq(10));
+ EXPECT_THAT(sampler2.period(), Eq(20));
+}
+
+} // namespace
+} // namespace base_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/base/internal/pretty_function.h b/third_party/abseil/src/absl/base/internal/pretty_function.h
new file mode 100644
index 0000000..35d5167
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/pretty_function.h
@@ -0,0 +1,33 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_BASE_INTERNAL_PRETTY_FUNCTION_H_
+#define ABSL_BASE_INTERNAL_PRETTY_FUNCTION_H_
+
+// ABSL_PRETTY_FUNCTION
+//
+// In C++11, __func__ gives the undecorated name of the current function. That
+// is, "main", not "int main()". Various compilers give extra macros to get the
+// decorated function name, including return type and arguments, to
+// differentiate between overload sets. ABSL_PRETTY_FUNCTION is a portable
+// version of these macros which forwards to the correct macro on each compiler.
+#if defined(_MSC_VER)
+#define ABSL_PRETTY_FUNCTION __FUNCSIG__
+#elif defined(__GNUC__)
+#define ABSL_PRETTY_FUNCTION __PRETTY_FUNCTION__
+#else
+#error "Unsupported compiler"
+#endif
+
+#endif // ABSL_BASE_INTERNAL_PRETTY_FUNCTION_H_
diff --git a/third_party/abseil/src/absl/base/internal/raw_logging.cc b/third_party/abseil/src/absl/base/internal/raw_logging.cc
new file mode 100644
index 0000000..ae8754c
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/raw_logging.cc
@@ -0,0 +1,240 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/base/internal/raw_logging.h"
+
+#include <stddef.h>
+#include <cstdarg>
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+
+#include "absl/base/attributes.h"
+#include "absl/base/config.h"
+#include "absl/base/internal/atomic_hook.h"
+#include "absl/base/log_severity.h"
+
+// We know how to perform low-level writes to stderr in POSIX and Windows. For
+// these platforms, we define the token ABSL_LOW_LEVEL_WRITE_SUPPORTED.
+// Much of raw_logging.cc becomes a no-op when we can't output messages,
+// although a FATAL ABSL_RAW_LOG message will still abort the process.
+
+// ABSL_HAVE_POSIX_WRITE is defined when the platform provides posix write()
+// (as from unistd.h)
+//
+// This preprocessor token is also defined in raw_io.cc. If you need to copy
+// this, consider moving both to config.h instead.
+#if defined(__linux__) || defined(__APPLE__) || defined(__FreeBSD__) || \
+ defined(__Fuchsia__) || defined(__native_client__) || \
+ defined(__EMSCRIPTEN__) || defined(__ASYLO__)
+
+#include <unistd.h>
+
+#define ABSL_HAVE_POSIX_WRITE 1
+#define ABSL_LOW_LEVEL_WRITE_SUPPORTED 1
+#else
+#undef ABSL_HAVE_POSIX_WRITE
+#endif
+
+// ABSL_HAVE_SYSCALL_WRITE is defined when the platform provides the syscall
+// syscall(SYS_write, /*int*/ fd, /*char* */ buf, /*size_t*/ len);
+// for low level operations that want to avoid libc.
+#if (defined(__linux__) || defined(__FreeBSD__)) && !defined(__ANDROID__)
+#include <sys/syscall.h>
+#define ABSL_HAVE_SYSCALL_WRITE 1
+#define ABSL_LOW_LEVEL_WRITE_SUPPORTED 1
+#else
+#undef ABSL_HAVE_SYSCALL_WRITE
+#endif
+
+#ifdef _WIN32
+#include <io.h>
+
+#define ABSL_HAVE_RAW_IO 1
+#define ABSL_LOW_LEVEL_WRITE_SUPPORTED 1
+#else
+#undef ABSL_HAVE_RAW_IO
+#endif
+
+// TODO(gfalcon): We want raw-logging to work on as many platforms as possible.
+// Explicitly #error out when not ABSL_LOW_LEVEL_WRITE_SUPPORTED, except for a
+// selected set of platforms for which we expect not to be able to raw log.
+
+ABSL_INTERNAL_ATOMIC_HOOK_ATTRIBUTES static absl::base_internal::AtomicHook<
+ absl::raw_logging_internal::LogPrefixHook>
+ log_prefix_hook;
+ABSL_INTERNAL_ATOMIC_HOOK_ATTRIBUTES static absl::base_internal::AtomicHook<
+ absl::raw_logging_internal::AbortHook>
+ abort_hook;
+
+#ifdef ABSL_LOW_LEVEL_WRITE_SUPPORTED
+static const char kTruncated[] = " ... (message truncated)\n";
+
+// sprintf the format to the buffer, adjusting *buf and *size to reflect the
+// consumed bytes, and return whether the message fit without truncation. If
+// truncation occurred, if possible leave room in the buffer for the message
+// kTruncated[].
+inline static bool VADoRawLog(char** buf, int* size, const char* format,
+ va_list ap) ABSL_PRINTF_ATTRIBUTE(3, 0);
+inline static bool VADoRawLog(char** buf, int* size,
+ const char* format, va_list ap) {
+ int n = vsnprintf(*buf, *size, format, ap);
+ bool result = true;
+ if (n < 0 || n > *size) {
+ result = false;
+ if (static_cast<size_t>(*size) > sizeof(kTruncated)) {
+ n = *size - sizeof(kTruncated); // room for truncation message
+ } else {
+ n = 0; // no room for truncation message
+ }
+ }
+ *size -= n;
+ *buf += n;
+ return result;
+}
+#endif // ABSL_LOW_LEVEL_WRITE_SUPPORTED
+
+static constexpr int kLogBufSize = 3000;
+
+namespace {
+
+// CAVEAT: vsnprintf called from *DoRawLog below has some (exotic) code paths
+// that invoke malloc() and getenv() that might acquire some locks.
+
+// Helper for RawLog below.
+// *DoRawLog writes to *buf of *size and move them past the written portion.
+// It returns true iff there was no overflow or error.
+bool DoRawLog(char** buf, int* size, const char* format, ...)
+ ABSL_PRINTF_ATTRIBUTE(3, 4);
+bool DoRawLog(char** buf, int* size, const char* format, ...) {
+ va_list ap;
+ va_start(ap, format);
+ int n = vsnprintf(*buf, *size, format, ap);
+ va_end(ap);
+ if (n < 0 || n > *size) return false;
+ *size -= n;
+ *buf += n;
+ return true;
+}
+
+void RawLogVA(absl::LogSeverity severity, const char* file, int line,
+ const char* format, va_list ap) ABSL_PRINTF_ATTRIBUTE(4, 0);
+void RawLogVA(absl::LogSeverity severity, const char* file, int line,
+ const char* format, va_list ap) {
+ char buffer[kLogBufSize];
+ char* buf = buffer;
+ int size = sizeof(buffer);
+#ifdef ABSL_LOW_LEVEL_WRITE_SUPPORTED
+ bool enabled = true;
+#else
+ bool enabled = false;
+#endif
+
+#ifdef ABSL_MIN_LOG_LEVEL
+ if (severity < static_cast<absl::LogSeverity>(ABSL_MIN_LOG_LEVEL) &&
+ severity < absl::LogSeverity::kFatal) {
+ enabled = false;
+ }
+#endif
+
+ auto log_prefix_hook_ptr = log_prefix_hook.Load();
+ if (log_prefix_hook_ptr) {
+ enabled = log_prefix_hook_ptr(severity, file, line, &buf, &size);
+ } else {
+ if (enabled) {
+ DoRawLog(&buf, &size, "[%s : %d] RAW: ", file, line);
+ }
+ }
+ const char* const prefix_end = buf;
+
+#ifdef ABSL_LOW_LEVEL_WRITE_SUPPORTED
+ if (enabled) {
+ bool no_chop = VADoRawLog(&buf, &size, format, ap);
+ if (no_chop) {
+ DoRawLog(&buf, &size, "\n");
+ } else {
+ DoRawLog(&buf, &size, "%s", kTruncated);
+ }
+ absl::raw_logging_internal::SafeWriteToStderr(buffer, strlen(buffer));
+ }
+#else
+ static_cast<void>(format);
+ static_cast<void>(ap);
+#endif
+
+ // Abort the process after logging a FATAL message, even if the output itself
+ // was suppressed.
+ if (severity == absl::LogSeverity::kFatal) {
+ abort_hook(file, line, buffer, prefix_end, buffer + kLogBufSize);
+ abort();
+ }
+}
+
+} // namespace
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace raw_logging_internal {
+void SafeWriteToStderr(const char *s, size_t len) {
+#if defined(ABSL_HAVE_SYSCALL_WRITE)
+ syscall(SYS_write, STDERR_FILENO, s, len);
+#elif defined(ABSL_HAVE_POSIX_WRITE)
+ write(STDERR_FILENO, s, len);
+#elif defined(ABSL_HAVE_RAW_IO)
+ _write(/* stderr */ 2, s, len);
+#else
+ // stderr logging unsupported on this platform
+ (void) s;
+ (void) len;
+#endif
+}
+
+void RawLog(absl::LogSeverity severity, const char* file, int line,
+ const char* format, ...) ABSL_PRINTF_ATTRIBUTE(4, 5);
+void RawLog(absl::LogSeverity severity, const char* file, int line,
+ const char* format, ...) {
+ va_list ap;
+ va_start(ap, format);
+ RawLogVA(severity, file, line, format, ap);
+ va_end(ap);
+}
+
+// Non-formatting version of RawLog().
+//
+// TODO(gfalcon): When string_view no longer depends on base, change this
+// interface to take its message as a string_view instead.
+static void DefaultInternalLog(absl::LogSeverity severity, const char* file,
+ int line, const std::string& message) {
+ RawLog(severity, file, line, "%s", message.c_str());
+}
+
+bool RawLoggingFullySupported() {
+#ifdef ABSL_LOW_LEVEL_WRITE_SUPPORTED
+ return true;
+#else // !ABSL_LOW_LEVEL_WRITE_SUPPORTED
+ return false;
+#endif // !ABSL_LOW_LEVEL_WRITE_SUPPORTED
+}
+
+ABSL_INTERNAL_ATOMIC_HOOK_ATTRIBUTES ABSL_DLL
+ absl::base_internal::AtomicHook<InternalLogFunction>
+ internal_log_function(DefaultInternalLog);
+
+void RegisterInternalLogFunction(InternalLogFunction func) {
+ internal_log_function.Store(func);
+}
+
+} // namespace raw_logging_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/base/internal/raw_logging.h b/third_party/abseil/src/absl/base/internal/raw_logging.h
new file mode 100644
index 0000000..20f4291
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/raw_logging.h
@@ -0,0 +1,187 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// Thread-safe logging routines that do not allocate any memory or
+// acquire any locks, and can therefore be used by low-level memory
+// allocation, synchronization, and signal-handling code.
+
+#ifndef ABSL_BASE_INTERNAL_RAW_LOGGING_H_
+#define ABSL_BASE_INTERNAL_RAW_LOGGING_H_
+
+#include <string>
+
+#include "absl/base/attributes.h"
+#include "absl/base/config.h"
+#include "absl/base/internal/atomic_hook.h"
+#include "absl/base/log_severity.h"
+#include "absl/base/macros.h"
+#include "absl/base/optimization.h"
+#include "absl/base/port.h"
+
+// This is similar to LOG(severity) << format..., but
+// * it is to be used ONLY by low-level modules that can't use normal LOG()
+// * it is designed to be a low-level logger that does not allocate any
+// memory and does not need any locks, hence:
+// * it logs straight and ONLY to STDERR w/o buffering
+// * it uses an explicit printf-format and arguments list
+// * it will silently chop off really long message strings
+// Usage example:
+// ABSL_RAW_LOG(ERROR, "Failed foo with %i: %s", status, error);
+// This will print an almost standard log line like this to stderr only:
+// E0821 211317 file.cc:123] RAW: Failed foo with 22: bad_file
+
+#define ABSL_RAW_LOG(severity, ...) \
+ do { \
+ constexpr const char* absl_raw_logging_internal_basename = \
+ ::absl::raw_logging_internal::Basename(__FILE__, \
+ sizeof(__FILE__) - 1); \
+ ::absl::raw_logging_internal::RawLog(ABSL_RAW_LOGGING_INTERNAL_##severity, \
+ absl_raw_logging_internal_basename, \
+ __LINE__, __VA_ARGS__); \
+ } while (0)
+
+// Similar to CHECK(condition) << message, but for low-level modules:
+// we use only ABSL_RAW_LOG that does not allocate memory.
+// We do not want to provide args list here to encourage this usage:
+// if (!cond) ABSL_RAW_LOG(FATAL, "foo ...", hard_to_compute_args);
+// so that the args are not computed when not needed.
+#define ABSL_RAW_CHECK(condition, message) \
+ do { \
+ if (ABSL_PREDICT_FALSE(!(condition))) { \
+ ABSL_RAW_LOG(FATAL, "Check %s failed: %s", #condition, message); \
+ } \
+ } while (0)
+
+// ABSL_INTERNAL_LOG and ABSL_INTERNAL_CHECK work like the RAW variants above,
+// except that if the richer log library is linked into the binary, we dispatch
+// to that instead. This is potentially useful for internal logging and
+// assertions, where we are using RAW_LOG neither for its async-signal-safety
+// nor for its non-allocating nature, but rather because raw logging has very
+// few other dependencies.
+//
+// The API is a subset of the above: each macro only takes two arguments. Use
+// StrCat if you need to build a richer message.
+#define ABSL_INTERNAL_LOG(severity, message) \
+ do { \
+ constexpr const char* absl_raw_logging_internal_filename = __FILE__; \
+ ::absl::raw_logging_internal::internal_log_function( \
+ ABSL_RAW_LOGGING_INTERNAL_##severity, \
+ absl_raw_logging_internal_filename, __LINE__, message); \
+ if (ABSL_RAW_LOGGING_INTERNAL_##severity == ::absl::LogSeverity::kFatal) \
+ ABSL_INTERNAL_UNREACHABLE; \
+ } while (0)
+
+#define ABSL_INTERNAL_CHECK(condition, message) \
+ do { \
+ if (ABSL_PREDICT_FALSE(!(condition))) { \
+ std::string death_message = "Check " #condition " failed: "; \
+ death_message += std::string(message); \
+ ABSL_INTERNAL_LOG(FATAL, death_message); \
+ } \
+ } while (0)
+
+#define ABSL_RAW_LOGGING_INTERNAL_INFO ::absl::LogSeverity::kInfo
+#define ABSL_RAW_LOGGING_INTERNAL_WARNING ::absl::LogSeverity::kWarning
+#define ABSL_RAW_LOGGING_INTERNAL_ERROR ::absl::LogSeverity::kError
+#define ABSL_RAW_LOGGING_INTERNAL_FATAL ::absl::LogSeverity::kFatal
+#define ABSL_RAW_LOGGING_INTERNAL_LEVEL(severity) \
+ ::absl::NormalizeLogSeverity(severity)
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace raw_logging_internal {
+
+// Helper function to implement ABSL_RAW_LOG
+// Logs format... at "severity" level, reporting it
+// as called from file:line.
+// This does not allocate memory or acquire locks.
+void RawLog(absl::LogSeverity severity, const char* file, int line,
+ const char* format, ...) ABSL_PRINTF_ATTRIBUTE(4, 5);
+
+// Writes the provided buffer directly to stderr, in a safe, low-level manner.
+//
+// In POSIX this means calling write(), which is async-signal safe and does
+// not malloc. If the platform supports the SYS_write syscall, we invoke that
+// directly to side-step any libc interception.
+void SafeWriteToStderr(const char *s, size_t len);
+
+// compile-time function to get the "base" filename, that is, the part of
+// a filename after the last "/" or "\" path separator. The search starts at
+// the end of the string; the second parameter is the length of the string.
+constexpr const char* Basename(const char* fname, int offset) {
+ return offset == 0 || fname[offset - 1] == '/' || fname[offset - 1] == '\\'
+ ? fname + offset
+ : Basename(fname, offset - 1);
+}
+
+// For testing only.
+// Returns true if raw logging is fully supported. When it is not
+// fully supported, no messages will be emitted, but a log at FATAL
+// severity will cause an abort.
+//
+// TODO(gfalcon): Come up with a better name for this method.
+bool RawLoggingFullySupported();
+
+// Function type for a raw_logging customization hook for suppressing messages
+// by severity, and for writing custom prefixes on non-suppressed messages.
+//
+// The installed hook is called for every raw log invocation. The message will
+// be logged to stderr only if the hook returns true. FATAL errors will cause
+// the process to abort, even if writing to stderr is suppressed. The hook is
+// also provided with an output buffer, where it can write a custom log message
+// prefix.
+//
+// The raw_logging system does not allocate memory or grab locks. User-provided
+// hooks must avoid these operations, and must not throw exceptions.
+//
+// 'severity' is the severity level of the message being written.
+// 'file' and 'line' are the file and line number where the ABSL_RAW_LOG macro
+// was located.
+// 'buffer' and 'buf_size' are pointers to the buffer and buffer size. If the
+// hook writes a prefix, it must increment *buffer and decrement *buf_size
+// accordingly.
+using LogPrefixHook = bool (*)(absl::LogSeverity severity, const char* file,
+ int line, char** buffer, int* buf_size);
+
+// Function type for a raw_logging customization hook called to abort a process
+// when a FATAL message is logged. If the provided AbortHook() returns, the
+// logging system will call abort().
+//
+// 'file' and 'line' are the file and line number where the ABSL_RAW_LOG macro
+// was located.
+// The NUL-terminated logged message lives in the buffer between 'buf_start'
+// and 'buf_end'. 'prefix_end' points to the first non-prefix character of the
+// buffer (as written by the LogPrefixHook.)
+using AbortHook = void (*)(const char* file, int line, const char* buf_start,
+ const char* prefix_end, const char* buf_end);
+
+// Internal logging function for ABSL_INTERNAL_LOG to dispatch to.
+//
+// TODO(gfalcon): When string_view no longer depends on base, change this
+// interface to take its message as a string_view instead.
+using InternalLogFunction = void (*)(absl::LogSeverity severity,
+ const char* file, int line,
+ const std::string& message);
+
+ABSL_INTERNAL_ATOMIC_HOOK_ATTRIBUTES ABSL_DLL extern base_internal::AtomicHook<
+ InternalLogFunction>
+ internal_log_function;
+
+void RegisterInternalLogFunction(InternalLogFunction func);
+
+} // namespace raw_logging_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_BASE_INTERNAL_RAW_LOGGING_H_
diff --git a/third_party/abseil/src/absl/base/internal/scheduling_mode.h b/third_party/abseil/src/absl/base/internal/scheduling_mode.h
new file mode 100644
index 0000000..8be5ab6
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/scheduling_mode.h
@@ -0,0 +1,58 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// Core interfaces and definitions used by by low-level interfaces such as
+// SpinLock.
+
+#ifndef ABSL_BASE_INTERNAL_SCHEDULING_MODE_H_
+#define ABSL_BASE_INTERNAL_SCHEDULING_MODE_H_
+
+#include "absl/base/config.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace base_internal {
+
+// Used to describe how a thread may be scheduled. Typically associated with
+// the declaration of a resource supporting synchronized access.
+//
+// SCHEDULE_COOPERATIVE_AND_KERNEL:
+// Specifies that when waiting, a cooperative thread (e.g. a Fiber) may
+// reschedule (using base::scheduling semantics); allowing other cooperative
+// threads to proceed.
+//
+// SCHEDULE_KERNEL_ONLY: (Also described as "non-cooperative")
+// Specifies that no cooperative scheduling semantics may be used, even if the
+// current thread is itself cooperatively scheduled. This means that
+// cooperative threads will NOT allow other cooperative threads to execute in
+// their place while waiting for a resource of this type. Host operating system
+// semantics (e.g. a futex) may still be used.
+//
+// When optional, clients should strongly prefer SCHEDULE_COOPERATIVE_AND_KERNEL
+// by default. SCHEDULE_KERNEL_ONLY should only be used for resources on which
+// base::scheduling (e.g. the implementation of a Scheduler) may depend.
+//
+// NOTE: Cooperative resources may not be nested below non-cooperative ones.
+// This means that it is invalid to to acquire a SCHEDULE_COOPERATIVE_AND_KERNEL
+// resource if a SCHEDULE_KERNEL_ONLY resource is already held.
+enum SchedulingMode {
+ SCHEDULE_KERNEL_ONLY = 0, // Allow scheduling only the host OS.
+ SCHEDULE_COOPERATIVE_AND_KERNEL, // Also allow cooperative scheduling.
+};
+
+} // namespace base_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_BASE_INTERNAL_SCHEDULING_MODE_H_
diff --git a/third_party/abseil/src/absl/base/internal/scoped_set_env.cc b/third_party/abseil/src/absl/base/internal/scoped_set_env.cc
new file mode 100644
index 0000000..8a934cb
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/scoped_set_env.cc
@@ -0,0 +1,81 @@
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/base/internal/scoped_set_env.h"
+
+#ifdef _WIN32
+#include <windows.h>
+#endif
+
+#include <cstdlib>
+
+#include "absl/base/internal/raw_logging.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace base_internal {
+
+namespace {
+
+#ifdef _WIN32
+const int kMaxEnvVarValueSize = 1024;
+#endif
+
+void SetEnvVar(const char* name, const char* value) {
+#ifdef _WIN32
+ SetEnvironmentVariableA(name, value);
+#else
+ if (value == nullptr) {
+ ::unsetenv(name);
+ } else {
+ ::setenv(name, value, 1);
+ }
+#endif
+}
+
+} // namespace
+
+ScopedSetEnv::ScopedSetEnv(const char* var_name, const char* new_value)
+ : var_name_(var_name), was_unset_(false) {
+#ifdef _WIN32
+ char buf[kMaxEnvVarValueSize];
+ auto get_res = GetEnvironmentVariableA(var_name_.c_str(), buf, sizeof(buf));
+ ABSL_INTERNAL_CHECK(get_res < sizeof(buf), "value exceeds buffer size");
+
+ if (get_res == 0) {
+ was_unset_ = (GetLastError() == ERROR_ENVVAR_NOT_FOUND);
+ } else {
+ old_value_.assign(buf, get_res);
+ }
+
+ SetEnvironmentVariableA(var_name_.c_str(), new_value);
+#else
+ const char* val = ::getenv(var_name_.c_str());
+ if (val == nullptr) {
+ was_unset_ = true;
+ } else {
+ old_value_ = val;
+ }
+#endif
+
+ SetEnvVar(var_name_.c_str(), new_value);
+}
+
+ScopedSetEnv::~ScopedSetEnv() {
+ SetEnvVar(var_name_.c_str(), was_unset_ ? nullptr : old_value_.c_str());
+}
+
+} // namespace base_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/base/internal/scoped_set_env.h b/third_party/abseil/src/absl/base/internal/scoped_set_env.h
new file mode 100644
index 0000000..19ec7b5
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/scoped_set_env.h
@@ -0,0 +1,45 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+#ifndef ABSL_BASE_INTERNAL_SCOPED_SET_ENV_H_
+#define ABSL_BASE_INTERNAL_SCOPED_SET_ENV_H_
+
+#include <string>
+
+#include "absl/base/config.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace base_internal {
+
+class ScopedSetEnv {
+ public:
+ ScopedSetEnv(const char* var_name, const char* new_value);
+ ~ScopedSetEnv();
+
+ private:
+ std::string var_name_;
+ std::string old_value_;
+
+ // True if the environment variable was initially not set.
+ bool was_unset_;
+};
+
+} // namespace base_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_BASE_INTERNAL_SCOPED_SET_ENV_H_
diff --git a/third_party/abseil/src/absl/base/internal/scoped_set_env_test.cc b/third_party/abseil/src/absl/base/internal/scoped_set_env_test.cc
new file mode 100644
index 0000000..5cbad24
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/scoped_set_env_test.cc
@@ -0,0 +1,99 @@
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifdef _WIN32
+#include <windows.h>
+#endif
+
+#include "gtest/gtest.h"
+#include "absl/base/internal/scoped_set_env.h"
+
+namespace {
+
+using absl::base_internal::ScopedSetEnv;
+
+std::string GetEnvVar(const char* name) {
+#ifdef _WIN32
+ char buf[1024];
+ auto get_res = GetEnvironmentVariableA(name, buf, sizeof(buf));
+ if (get_res >= sizeof(buf)) {
+ return "TOO_BIG";
+ }
+
+ if (get_res == 0) {
+ return "UNSET";
+ }
+
+ return std::string(buf, get_res);
+#else
+ const char* val = ::getenv(name);
+ if (val == nullptr) {
+ return "UNSET";
+ }
+
+ return val;
+#endif
+}
+
+TEST(ScopedSetEnvTest, SetNonExistingVarToString) {
+ EXPECT_EQ(GetEnvVar("SCOPED_SET_ENV_TEST_VAR"), "UNSET");
+
+ {
+ ScopedSetEnv scoped_set("SCOPED_SET_ENV_TEST_VAR", "value");
+
+ EXPECT_EQ(GetEnvVar("SCOPED_SET_ENV_TEST_VAR"), "value");
+ }
+
+ EXPECT_EQ(GetEnvVar("SCOPED_SET_ENV_TEST_VAR"), "UNSET");
+}
+
+TEST(ScopedSetEnvTest, SetNonExistingVarToNull) {
+ EXPECT_EQ(GetEnvVar("SCOPED_SET_ENV_TEST_VAR"), "UNSET");
+
+ {
+ ScopedSetEnv scoped_set("SCOPED_SET_ENV_TEST_VAR", nullptr);
+
+ EXPECT_EQ(GetEnvVar("SCOPED_SET_ENV_TEST_VAR"), "UNSET");
+ }
+
+ EXPECT_EQ(GetEnvVar("SCOPED_SET_ENV_TEST_VAR"), "UNSET");
+}
+
+TEST(ScopedSetEnvTest, SetExistingVarToString) {
+ ScopedSetEnv scoped_set("SCOPED_SET_ENV_TEST_VAR", "value");
+ EXPECT_EQ(GetEnvVar("SCOPED_SET_ENV_TEST_VAR"), "value");
+
+ {
+ ScopedSetEnv scoped_set("SCOPED_SET_ENV_TEST_VAR", "new_value");
+
+ EXPECT_EQ(GetEnvVar("SCOPED_SET_ENV_TEST_VAR"), "new_value");
+ }
+
+ EXPECT_EQ(GetEnvVar("SCOPED_SET_ENV_TEST_VAR"), "value");
+}
+
+TEST(ScopedSetEnvTest, SetExistingVarToNull) {
+ ScopedSetEnv scoped_set("SCOPED_SET_ENV_TEST_VAR", "value");
+ EXPECT_EQ(GetEnvVar("SCOPED_SET_ENV_TEST_VAR"), "value");
+
+ {
+ ScopedSetEnv scoped_set("SCOPED_SET_ENV_TEST_VAR", nullptr);
+
+ EXPECT_EQ(GetEnvVar("SCOPED_SET_ENV_TEST_VAR"), "UNSET");
+ }
+
+ EXPECT_EQ(GetEnvVar("SCOPED_SET_ENV_TEST_VAR"), "value");
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/base/internal/spinlock.cc b/third_party/abseil/src/absl/base/internal/spinlock.cc
new file mode 100644
index 0000000..a7d44f3
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/spinlock.cc
@@ -0,0 +1,220 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/base/internal/spinlock.h"
+
+#include <algorithm>
+#include <atomic>
+#include <limits>
+
+#include "absl/base/attributes.h"
+#include "absl/base/internal/atomic_hook.h"
+#include "absl/base/internal/cycleclock.h"
+#include "absl/base/internal/spinlock_wait.h"
+#include "absl/base/internal/sysinfo.h" /* For NumCPUs() */
+#include "absl/base/call_once.h"
+
+// Description of lock-word:
+// 31..00: [............................3][2][1][0]
+//
+// [0]: kSpinLockHeld
+// [1]: kSpinLockCooperative
+// [2]: kSpinLockDisabledScheduling
+// [31..3]: ONLY kSpinLockSleeper OR
+// Wait time in cycles >> PROFILE_TIMESTAMP_SHIFT
+//
+// Detailed descriptions:
+//
+// Bit [0]: The lock is considered held iff kSpinLockHeld is set.
+//
+// Bit [1]: Eligible waiters (e.g. Fibers) may co-operatively reschedule when
+// contended iff kSpinLockCooperative is set.
+//
+// Bit [2]: This bit is exclusive from bit [1]. It is used only by a
+// non-cooperative lock. When set, indicates that scheduling was
+// successfully disabled when the lock was acquired. May be unset,
+// even if non-cooperative, if a ThreadIdentity did not yet exist at
+// time of acquisition.
+//
+// Bit [3]: If this is the only upper bit ([31..3]) set then this lock was
+// acquired without contention, however, at least one waiter exists.
+//
+// Otherwise, bits [31..3] represent the time spent by the current lock
+// holder to acquire the lock. There may be outstanding waiter(s).
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace base_internal {
+
+ABSL_INTERNAL_ATOMIC_HOOK_ATTRIBUTES static base_internal::AtomicHook<void (*)(
+ const void *lock, int64_t wait_cycles)>
+ submit_profile_data;
+
+void RegisterSpinLockProfiler(void (*fn)(const void *contendedlock,
+ int64_t wait_cycles)) {
+ submit_profile_data.Store(fn);
+}
+
+// Static member variable definitions.
+constexpr uint32_t SpinLock::kSpinLockHeld;
+constexpr uint32_t SpinLock::kSpinLockCooperative;
+constexpr uint32_t SpinLock::kSpinLockDisabledScheduling;
+constexpr uint32_t SpinLock::kSpinLockSleeper;
+constexpr uint32_t SpinLock::kWaitTimeMask;
+
+// Uncommon constructors.
+SpinLock::SpinLock(base_internal::SchedulingMode mode)
+ : lockword_(IsCooperative(mode) ? kSpinLockCooperative : 0) {
+ ABSL_TSAN_MUTEX_CREATE(this, __tsan_mutex_not_static);
+}
+
+// Monitor the lock to see if its value changes within some time period
+// (adaptive_spin_count loop iterations). The last value read from the lock
+// is returned from the method.
+uint32_t SpinLock::SpinLoop() {
+ // We are already in the slow path of SpinLock, initialize the
+ // adaptive_spin_count here.
+ ABSL_CONST_INIT static absl::once_flag init_adaptive_spin_count;
+ ABSL_CONST_INIT static int adaptive_spin_count = 0;
+ base_internal::LowLevelCallOnce(&init_adaptive_spin_count, []() {
+ adaptive_spin_count = base_internal::NumCPUs() > 1 ? 1000 : 1;
+ });
+
+ int c = adaptive_spin_count;
+ uint32_t lock_value;
+ do {
+ lock_value = lockword_.load(std::memory_order_relaxed);
+ } while ((lock_value & kSpinLockHeld) != 0 && --c > 0);
+ return lock_value;
+}
+
+void SpinLock::SlowLock() {
+ uint32_t lock_value = SpinLoop();
+ lock_value = TryLockInternal(lock_value, 0);
+ if ((lock_value & kSpinLockHeld) == 0) {
+ return;
+ }
+
+ base_internal::SchedulingMode scheduling_mode;
+ if ((lock_value & kSpinLockCooperative) != 0) {
+ scheduling_mode = base_internal::SCHEDULE_COOPERATIVE_AND_KERNEL;
+ } else {
+ scheduling_mode = base_internal::SCHEDULE_KERNEL_ONLY;
+ }
+
+ // The lock was not obtained initially, so this thread needs to wait for
+ // it. Record the current timestamp in the local variable wait_start_time
+ // so the total wait time can be stored in the lockword once this thread
+ // obtains the lock.
+ int64_t wait_start_time = CycleClock::Now();
+ uint32_t wait_cycles = 0;
+ int lock_wait_call_count = 0;
+ while ((lock_value & kSpinLockHeld) != 0) {
+ // If the lock is currently held, but not marked as having a sleeper, mark
+ // it as having a sleeper.
+ if ((lock_value & kWaitTimeMask) == 0) {
+ // Here, just "mark" that the thread is going to sleep. Don't store the
+ // lock wait time in the lock as that will cause the current lock
+ // owner to think it experienced contention.
+ if (lockword_.compare_exchange_strong(
+ lock_value, lock_value | kSpinLockSleeper,
+ std::memory_order_relaxed, std::memory_order_relaxed)) {
+ // Successfully transitioned to kSpinLockSleeper. Pass
+ // kSpinLockSleeper to the SpinLockWait routine to properly indicate
+ // the last lock_value observed.
+ lock_value |= kSpinLockSleeper;
+ } else if ((lock_value & kSpinLockHeld) == 0) {
+ // Lock is free again, so try and acquire it before sleeping. The
+ // new lock state will be the number of cycles this thread waited if
+ // this thread obtains the lock.
+ lock_value = TryLockInternal(lock_value, wait_cycles);
+ continue; // Skip the delay at the end of the loop.
+ }
+ }
+
+ // SpinLockDelay() calls into fiber scheduler, we need to see
+ // synchronization there to avoid false positives.
+ ABSL_TSAN_MUTEX_PRE_DIVERT(this, 0);
+ // Wait for an OS specific delay.
+ base_internal::SpinLockDelay(&lockword_, lock_value, ++lock_wait_call_count,
+ scheduling_mode);
+ ABSL_TSAN_MUTEX_POST_DIVERT(this, 0);
+ // Spin again after returning from the wait routine to give this thread
+ // some chance of obtaining the lock.
+ lock_value = SpinLoop();
+ wait_cycles = EncodeWaitCycles(wait_start_time, CycleClock::Now());
+ lock_value = TryLockInternal(lock_value, wait_cycles);
+ }
+}
+
+void SpinLock::SlowUnlock(uint32_t lock_value) {
+ base_internal::SpinLockWake(&lockword_,
+ false); // wake waiter if necessary
+
+ // If our acquisition was contended, collect contentionz profile info. We
+ // reserve a unitary wait time to represent that a waiter exists without our
+ // own acquisition having been contended.
+ if ((lock_value & kWaitTimeMask) != kSpinLockSleeper) {
+ const uint64_t wait_cycles = DecodeWaitCycles(lock_value);
+ ABSL_TSAN_MUTEX_PRE_DIVERT(this, 0);
+ submit_profile_data(this, wait_cycles);
+ ABSL_TSAN_MUTEX_POST_DIVERT(this, 0);
+ }
+}
+
+// We use the upper 29 bits of the lock word to store the time spent waiting to
+// acquire this lock. This is reported by contentionz profiling. Since the
+// lower bits of the cycle counter wrap very quickly on high-frequency
+// processors we divide to reduce the granularity to 2^kProfileTimestampShift
+// sized units. On a 4Ghz machine this will lose track of wait times greater
+// than (2^29/4 Ghz)*128 =~ 17.2 seconds. Such waits should be extremely rare.
+static constexpr int kProfileTimestampShift = 7;
+
+// We currently reserve the lower 3 bits.
+static constexpr int kLockwordReservedShift = 3;
+
+uint32_t SpinLock::EncodeWaitCycles(int64_t wait_start_time,
+ int64_t wait_end_time) {
+ static const int64_t kMaxWaitTime =
+ std::numeric_limits<uint32_t>::max() >> kLockwordReservedShift;
+ int64_t scaled_wait_time =
+ (wait_end_time - wait_start_time) >> kProfileTimestampShift;
+
+ // Return a representation of the time spent waiting that can be stored in
+ // the lock word's upper bits.
+ uint32_t clamped = static_cast<uint32_t>(
+ std::min(scaled_wait_time, kMaxWaitTime) << kLockwordReservedShift);
+
+ if (clamped == 0) {
+ return kSpinLockSleeper; // Just wake waiters, but don't record contention.
+ }
+ // Bump up value if necessary to avoid returning kSpinLockSleeper.
+ const uint32_t kMinWaitTime =
+ kSpinLockSleeper + (1 << kLockwordReservedShift);
+ if (clamped == kSpinLockSleeper) {
+ return kMinWaitTime;
+ }
+ return clamped;
+}
+
+uint64_t SpinLock::DecodeWaitCycles(uint32_t lock_value) {
+ // Cast to uint32_t first to ensure bits [63:32] are cleared.
+ const uint64_t scaled_wait_time =
+ static_cast<uint32_t>(lock_value & kWaitTimeMask);
+ return scaled_wait_time << (kProfileTimestampShift - kLockwordReservedShift);
+}
+
+} // namespace base_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/base/internal/spinlock.h b/third_party/abseil/src/absl/base/internal/spinlock.h
new file mode 100644
index 0000000..e6ac9e6
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/spinlock.h
@@ -0,0 +1,237 @@
+//
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+// Most users requiring mutual exclusion should use Mutex.
+// SpinLock is provided for use in three situations:
+// - for use in code that Mutex itself depends on
+// - to get a faster fast-path release under low contention (without an
+// atomic read-modify-write) In return, SpinLock has worse behaviour under
+// contention, which is why Mutex is preferred in most situations.
+// - for async signal safety (see below)
+
+// SpinLock is async signal safe. If a spinlock is used within a signal
+// handler, all code that acquires the lock must ensure that the signal cannot
+// arrive while they are holding the lock. Typically, this is done by blocking
+// the signal.
+
+#ifndef ABSL_BASE_INTERNAL_SPINLOCK_H_
+#define ABSL_BASE_INTERNAL_SPINLOCK_H_
+
+#include <stdint.h>
+#include <sys/types.h>
+
+#include <atomic>
+
+#include "absl/base/attributes.h"
+#include "absl/base/const_init.h"
+#include "absl/base/dynamic_annotations.h"
+#include "absl/base/internal/low_level_scheduling.h"
+#include "absl/base/internal/raw_logging.h"
+#include "absl/base/internal/scheduling_mode.h"
+#include "absl/base/internal/tsan_mutex_interface.h"
+#include "absl/base/macros.h"
+#include "absl/base/port.h"
+#include "absl/base/thread_annotations.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace base_internal {
+
+class ABSL_LOCKABLE SpinLock {
+ public:
+ SpinLock() : lockword_(kSpinLockCooperative) {
+ ABSL_TSAN_MUTEX_CREATE(this, __tsan_mutex_not_static);
+ }
+
+ // Constructors that allow non-cooperative spinlocks to be created for use
+ // inside thread schedulers. Normal clients should not use these.
+ explicit SpinLock(base_internal::SchedulingMode mode);
+
+ // Constructor for global SpinLock instances. See absl/base/const_init.h.
+ constexpr SpinLock(absl::ConstInitType, base_internal::SchedulingMode mode)
+ : lockword_(IsCooperative(mode) ? kSpinLockCooperative : 0) {}
+
+ // For global SpinLock instances prefer trivial destructor when possible.
+ // Default but non-trivial destructor in some build configurations causes an
+ // extra static initializer.
+#ifdef ABSL_INTERNAL_HAVE_TSAN_INTERFACE
+ ~SpinLock() { ABSL_TSAN_MUTEX_DESTROY(this, __tsan_mutex_not_static); }
+#else
+ ~SpinLock() = default;
+#endif
+
+ // Acquire this SpinLock.
+ inline void Lock() ABSL_EXCLUSIVE_LOCK_FUNCTION() {
+ ABSL_TSAN_MUTEX_PRE_LOCK(this, 0);
+ if (!TryLockImpl()) {
+ SlowLock();
+ }
+ ABSL_TSAN_MUTEX_POST_LOCK(this, 0, 0);
+ }
+
+ // Try to acquire this SpinLock without blocking and return true if the
+ // acquisition was successful. If the lock was not acquired, false is
+ // returned. If this SpinLock is free at the time of the call, TryLock
+ // will return true with high probability.
+ inline bool TryLock() ABSL_EXCLUSIVE_TRYLOCK_FUNCTION(true) {
+ ABSL_TSAN_MUTEX_PRE_LOCK(this, __tsan_mutex_try_lock);
+ bool res = TryLockImpl();
+ ABSL_TSAN_MUTEX_POST_LOCK(
+ this, __tsan_mutex_try_lock | (res ? 0 : __tsan_mutex_try_lock_failed),
+ 0);
+ return res;
+ }
+
+ // Release this SpinLock, which must be held by the calling thread.
+ inline void Unlock() ABSL_UNLOCK_FUNCTION() {
+ ABSL_TSAN_MUTEX_PRE_UNLOCK(this, 0);
+ uint32_t lock_value = lockword_.load(std::memory_order_relaxed);
+ lock_value = lockword_.exchange(lock_value & kSpinLockCooperative,
+ std::memory_order_release);
+
+ if ((lock_value & kSpinLockDisabledScheduling) != 0) {
+ base_internal::SchedulingGuard::EnableRescheduling(true);
+ }
+ if ((lock_value & kWaitTimeMask) != 0) {
+ // Collect contentionz profile info, and speed the wakeup of any waiter.
+ // The wait_cycles value indicates how long this thread spent waiting
+ // for the lock.
+ SlowUnlock(lock_value);
+ }
+ ABSL_TSAN_MUTEX_POST_UNLOCK(this, 0);
+ }
+
+ // Determine if the lock is held. When the lock is held by the invoking
+ // thread, true will always be returned. Intended to be used as
+ // CHECK(lock.IsHeld()).
+ inline bool IsHeld() const {
+ return (lockword_.load(std::memory_order_relaxed) & kSpinLockHeld) != 0;
+ }
+
+ protected:
+ // These should not be exported except for testing.
+
+ // Store number of cycles between wait_start_time and wait_end_time in a
+ // lock value.
+ static uint32_t EncodeWaitCycles(int64_t wait_start_time,
+ int64_t wait_end_time);
+
+ // Extract number of wait cycles in a lock value.
+ static uint64_t DecodeWaitCycles(uint32_t lock_value);
+
+ // Provide access to protected method above. Use for testing only.
+ friend struct SpinLockTest;
+
+ private:
+ // lockword_ is used to store the following:
+ //
+ // bit[0] encodes whether a lock is being held.
+ // bit[1] encodes whether a lock uses cooperative scheduling.
+ // bit[2] encodes whether a lock disables scheduling.
+ // bit[3:31] encodes time a lock spent on waiting as a 29-bit unsigned int.
+ static constexpr uint32_t kSpinLockHeld = 1;
+ static constexpr uint32_t kSpinLockCooperative = 2;
+ static constexpr uint32_t kSpinLockDisabledScheduling = 4;
+ static constexpr uint32_t kSpinLockSleeper = 8;
+ // Includes kSpinLockSleeper.
+ static constexpr uint32_t kWaitTimeMask =
+ ~(kSpinLockHeld | kSpinLockCooperative | kSpinLockDisabledScheduling);
+
+ // Returns true if the provided scheduling mode is cooperative.
+ static constexpr bool IsCooperative(
+ base_internal::SchedulingMode scheduling_mode) {
+ return scheduling_mode == base_internal::SCHEDULE_COOPERATIVE_AND_KERNEL;
+ }
+
+ uint32_t TryLockInternal(uint32_t lock_value, uint32_t wait_cycles);
+ void SlowLock() ABSL_ATTRIBUTE_COLD;
+ void SlowUnlock(uint32_t lock_value) ABSL_ATTRIBUTE_COLD;
+ uint32_t SpinLoop();
+
+ inline bool TryLockImpl() {
+ uint32_t lock_value = lockword_.load(std::memory_order_relaxed);
+ return (TryLockInternal(lock_value, 0) & kSpinLockHeld) == 0;
+ }
+
+ std::atomic<uint32_t> lockword_;
+
+ SpinLock(const SpinLock&) = delete;
+ SpinLock& operator=(const SpinLock&) = delete;
+};
+
+// Corresponding locker object that arranges to acquire a spinlock for
+// the duration of a C++ scope.
+class ABSL_SCOPED_LOCKABLE SpinLockHolder {
+ public:
+ inline explicit SpinLockHolder(SpinLock* l) ABSL_EXCLUSIVE_LOCK_FUNCTION(l)
+ : lock_(l) {
+ l->Lock();
+ }
+ inline ~SpinLockHolder() ABSL_UNLOCK_FUNCTION() { lock_->Unlock(); }
+
+ SpinLockHolder(const SpinLockHolder&) = delete;
+ SpinLockHolder& operator=(const SpinLockHolder&) = delete;
+
+ private:
+ SpinLock* lock_;
+};
+
+// Register a hook for profiling support.
+//
+// The function pointer registered here will be called whenever a spinlock is
+// contended. The callback is given an opaque handle to the contended spinlock
+// and the number of wait cycles. This is thread-safe, but only a single
+// profiler can be registered. It is an error to call this function multiple
+// times with different arguments.
+void RegisterSpinLockProfiler(void (*fn)(const void* lock,
+ int64_t wait_cycles));
+
+//------------------------------------------------------------------------------
+// Public interface ends here.
+//------------------------------------------------------------------------------
+
+// If (result & kSpinLockHeld) == 0, then *this was successfully locked.
+// Otherwise, returns last observed value for lockword_.
+inline uint32_t SpinLock::TryLockInternal(uint32_t lock_value,
+ uint32_t wait_cycles) {
+ if ((lock_value & kSpinLockHeld) != 0) {
+ return lock_value;
+ }
+
+ uint32_t sched_disabled_bit = 0;
+ if ((lock_value & kSpinLockCooperative) == 0) {
+ // For non-cooperative locks we must make sure we mark ourselves as
+ // non-reschedulable before we attempt to CompareAndSwap.
+ if (base_internal::SchedulingGuard::DisableRescheduling()) {
+ sched_disabled_bit = kSpinLockDisabledScheduling;
+ }
+ }
+
+ if (!lockword_.compare_exchange_strong(
+ lock_value,
+ kSpinLockHeld | lock_value | wait_cycles | sched_disabled_bit,
+ std::memory_order_acquire, std::memory_order_relaxed)) {
+ base_internal::SchedulingGuard::EnableRescheduling(sched_disabled_bit != 0);
+ }
+
+ return lock_value;
+}
+
+} // namespace base_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_BASE_INTERNAL_SPINLOCK_H_
diff --git a/third_party/abseil/src/absl/base/internal/spinlock_akaros.inc b/third_party/abseil/src/absl/base/internal/spinlock_akaros.inc
new file mode 100644
index 0000000..bc46894
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/spinlock_akaros.inc
@@ -0,0 +1,35 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// This file is an Akaros-specific part of spinlock_wait.cc
+
+#include <atomic>
+
+#include "absl/base/internal/scheduling_mode.h"
+
+extern "C" {
+
+ABSL_ATTRIBUTE_WEAK void AbslInternalSpinLockDelay(
+ std::atomic<uint32_t>* /* lock_word */, uint32_t /* value */,
+ int /* loop */, absl::base_internal::SchedulingMode /* mode */) {
+ // In Akaros, one must take care not to call anything that could cause a
+ // malloc(), a blocking system call, or a uthread_yield() while holding a
+ // spinlock. Our callers assume will not call into libraries or other
+ // arbitrary code.
+}
+
+ABSL_ATTRIBUTE_WEAK void AbslInternalSpinLockWake(
+ std::atomic<uint32_t>* /* lock_word */, bool /* all */) {}
+
+} // extern "C"
diff --git a/third_party/abseil/src/absl/base/internal/spinlock_benchmark.cc b/third_party/abseil/src/absl/base/internal/spinlock_benchmark.cc
new file mode 100644
index 0000000..0451c65
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/spinlock_benchmark.cc
@@ -0,0 +1,52 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// See also //absl/synchronization:mutex_benchmark for a comparison of SpinLock
+// and Mutex performance under varying levels of contention.
+
+#include "absl/base/internal/raw_logging.h"
+#include "absl/base/internal/scheduling_mode.h"
+#include "absl/base/internal/spinlock.h"
+#include "absl/synchronization/internal/create_thread_identity.h"
+#include "benchmark/benchmark.h"
+
+namespace {
+
+template <absl::base_internal::SchedulingMode scheduling_mode>
+static void BM_SpinLock(benchmark::State& state) {
+ // Ensure a ThreadIdentity is installed.
+ ABSL_INTERNAL_CHECK(
+ absl::synchronization_internal::GetOrCreateCurrentThreadIdentity() !=
+ nullptr,
+ "GetOrCreateCurrentThreadIdentity() failed");
+
+ static auto* spinlock = new absl::base_internal::SpinLock(scheduling_mode);
+ for (auto _ : state) {
+ absl::base_internal::SpinLockHolder holder(spinlock);
+ }
+}
+
+BENCHMARK_TEMPLATE(BM_SpinLock,
+ absl::base_internal::SCHEDULE_KERNEL_ONLY)
+ ->UseRealTime()
+ ->Threads(1)
+ ->ThreadPerCpu();
+
+BENCHMARK_TEMPLATE(BM_SpinLock,
+ absl::base_internal::SCHEDULE_COOPERATIVE_AND_KERNEL)
+ ->UseRealTime()
+ ->Threads(1)
+ ->ThreadPerCpu();
+
+} // namespace
diff --git a/third_party/abseil/src/absl/base/internal/spinlock_linux.inc b/third_party/abseil/src/absl/base/internal/spinlock_linux.inc
new file mode 100644
index 0000000..e31c6ed
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/spinlock_linux.inc
@@ -0,0 +1,74 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// This file is a Linux-specific part of spinlock_wait.cc
+
+#include <linux/futex.h>
+#include <sys/syscall.h>
+#include <unistd.h>
+
+#include <atomic>
+#include <climits>
+#include <cstdint>
+#include <ctime>
+
+#include "absl/base/attributes.h"
+#include "absl/base/internal/errno_saver.h"
+
+// The SpinLock lockword is `std::atomic<uint32_t>`. Here we assert that
+// `std::atomic<uint32_t>` is bitwise equivalent of the `int` expected
+// by SYS_futex. We also assume that reads/writes done to the lockword
+// by SYS_futex have rational semantics with regard to the
+// std::atomic<> API. C++ provides no guarantees of these assumptions,
+// but they are believed to hold in practice.
+static_assert(sizeof(std::atomic<uint32_t>) == sizeof(int),
+ "SpinLock lockword has the wrong size for a futex");
+
+// Some Android headers are missing these definitions even though they
+// support these futex operations.
+#ifdef __BIONIC__
+#ifndef SYS_futex
+#define SYS_futex __NR_futex
+#endif
+#ifndef FUTEX_PRIVATE_FLAG
+#define FUTEX_PRIVATE_FLAG 128
+#endif
+#endif
+
+#if defined(__NR_futex_time64) && !defined(SYS_futex_time64)
+#define SYS_futex_time64 __NR_futex_time64
+#endif
+
+#if defined(SYS_futex_time64) && !defined(SYS_futex)
+#define SYS_futex SYS_futex_time64
+#endif
+
+extern "C" {
+
+ABSL_ATTRIBUTE_WEAK void AbslInternalSpinLockDelay(
+ std::atomic<uint32_t> *w, uint32_t value, int loop,
+ absl::base_internal::SchedulingMode) {
+ absl::base_internal::ErrnoSaver errno_saver;
+ struct timespec tm;
+ tm.tv_sec = 0;
+ tm.tv_nsec = absl::base_internal::SpinLockSuggestedDelayNS(loop);
+ syscall(SYS_futex, w, FUTEX_WAIT | FUTEX_PRIVATE_FLAG, value, &tm);
+}
+
+ABSL_ATTRIBUTE_WEAK void AbslInternalSpinLockWake(std::atomic<uint32_t> *w,
+ bool all) {
+ syscall(SYS_futex, w, FUTEX_WAKE | FUTEX_PRIVATE_FLAG, all ? INT_MAX : 1, 0);
+}
+
+} // extern "C"
diff --git a/third_party/abseil/src/absl/base/internal/spinlock_posix.inc b/third_party/abseil/src/absl/base/internal/spinlock_posix.inc
new file mode 100644
index 0000000..fcd21b1
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/spinlock_posix.inc
@@ -0,0 +1,46 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// This file is a Posix-specific part of spinlock_wait.cc
+
+#include <sched.h>
+
+#include <atomic>
+#include <ctime>
+
+#include "absl/base/internal/errno_saver.h"
+#include "absl/base/internal/scheduling_mode.h"
+#include "absl/base/port.h"
+
+extern "C" {
+
+ABSL_ATTRIBUTE_WEAK void AbslInternalSpinLockDelay(
+ std::atomic<uint32_t>* /* lock_word */, uint32_t /* value */, int loop,
+ absl::base_internal::SchedulingMode /* mode */) {
+ absl::base_internal::ErrnoSaver errno_saver;
+ if (loop == 0) {
+ } else if (loop == 1) {
+ sched_yield();
+ } else {
+ struct timespec tm;
+ tm.tv_sec = 0;
+ tm.tv_nsec = absl::base_internal::SpinLockSuggestedDelayNS(loop);
+ nanosleep(&tm, nullptr);
+ }
+}
+
+ABSL_ATTRIBUTE_WEAK void AbslInternalSpinLockWake(
+ std::atomic<uint32_t>* /* lock_word */, bool /* all */) {}
+
+} // extern "C"
diff --git a/third_party/abseil/src/absl/base/internal/spinlock_wait.cc b/third_party/abseil/src/absl/base/internal/spinlock_wait.cc
new file mode 100644
index 0000000..fa824be
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/spinlock_wait.cc
@@ -0,0 +1,81 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// The OS-specific header included below must provide two calls:
+// AbslInternalSpinLockDelay() and AbslInternalSpinLockWake().
+// See spinlock_wait.h for the specs.
+
+#include <atomic>
+#include <cstdint>
+
+#include "absl/base/internal/spinlock_wait.h"
+
+#if defined(_WIN32)
+#include "absl/base/internal/spinlock_win32.inc"
+#elif defined(__linux__)
+#include "absl/base/internal/spinlock_linux.inc"
+#elif defined(__akaros__)
+#include "absl/base/internal/spinlock_akaros.inc"
+#else
+#include "absl/base/internal/spinlock_posix.inc"
+#endif
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace base_internal {
+
+// See spinlock_wait.h for spec.
+uint32_t SpinLockWait(std::atomic<uint32_t> *w, int n,
+ const SpinLockWaitTransition trans[],
+ base_internal::SchedulingMode scheduling_mode) {
+ int loop = 0;
+ for (;;) {
+ uint32_t v = w->load(std::memory_order_acquire);
+ int i;
+ for (i = 0; i != n && v != trans[i].from; i++) {
+ }
+ if (i == n) {
+ SpinLockDelay(w, v, ++loop, scheduling_mode); // no matching transition
+ } else if (trans[i].to == v || // null transition
+ w->compare_exchange_strong(v, trans[i].to,
+ std::memory_order_acquire,
+ std::memory_order_relaxed)) {
+ if (trans[i].done) return v;
+ }
+ }
+}
+
+static std::atomic<uint64_t> delay_rand;
+
+// Return a suggested delay in nanoseconds for iteration number "loop"
+int SpinLockSuggestedDelayNS(int loop) {
+ // Weak pseudo-random number generator to get some spread between threads
+ // when many are spinning.
+ uint64_t r = delay_rand.load(std::memory_order_relaxed);
+ r = 0x5deece66dLL * r + 0xb; // numbers from nrand48()
+ delay_rand.store(r, std::memory_order_relaxed);
+
+ if (loop < 0 || loop > 32) { // limit loop to 0..32
+ loop = 32;
+ }
+ const int kMinDelay = 128 << 10; // 128us
+ // Double delay every 8 iterations, up to 16x (2ms).
+ int delay = kMinDelay << (loop / 8);
+ // Randomize in delay..2*delay range, for resulting 128us..4ms range.
+ return delay | ((delay - 1) & static_cast<int>(r));
+}
+
+} // namespace base_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/base/internal/spinlock_wait.h b/third_party/abseil/src/absl/base/internal/spinlock_wait.h
new file mode 100644
index 0000000..169bc74
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/spinlock_wait.h
@@ -0,0 +1,93 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_BASE_INTERNAL_SPINLOCK_WAIT_H_
+#define ABSL_BASE_INTERNAL_SPINLOCK_WAIT_H_
+
+// Operations to make atomic transitions on a word, and to allow
+// waiting for those transitions to become possible.
+
+#include <stdint.h>
+#include <atomic>
+
+#include "absl/base/internal/scheduling_mode.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace base_internal {
+
+// SpinLockWait() waits until it can perform one of several transitions from
+// "from" to "to". It returns when it performs a transition where done==true.
+struct SpinLockWaitTransition {
+ uint32_t from;
+ uint32_t to;
+ bool done;
+};
+
+// Wait until *w can transition from trans[i].from to trans[i].to for some i
+// satisfying 0<=i<n && trans[i].done, atomically make the transition,
+// then return the old value of *w. Make any other atomic transitions
+// where !trans[i].done, but continue waiting.
+uint32_t SpinLockWait(std::atomic<uint32_t> *w, int n,
+ const SpinLockWaitTransition trans[],
+ SchedulingMode scheduling_mode);
+
+// If possible, wake some thread that has called SpinLockDelay(w, ...). If
+// "all" is true, wake all such threads. This call is a hint, and on some
+// systems it may be a no-op; threads calling SpinLockDelay() will always wake
+// eventually even if SpinLockWake() is never called.
+void SpinLockWake(std::atomic<uint32_t> *w, bool all);
+
+// Wait for an appropriate spin delay on iteration "loop" of a
+// spin loop on location *w, whose previously observed value was "value".
+// SpinLockDelay() may do nothing, may yield the CPU, may sleep a clock tick,
+// or may wait for a delay that can be truncated by a call to SpinLockWake(w).
+// In all cases, it must return in bounded time even if SpinLockWake() is not
+// called.
+void SpinLockDelay(std::atomic<uint32_t> *w, uint32_t value, int loop,
+ base_internal::SchedulingMode scheduling_mode);
+
+// Helper used by AbslInternalSpinLockDelay.
+// Returns a suggested delay in nanoseconds for iteration number "loop".
+int SpinLockSuggestedDelayNS(int loop);
+
+} // namespace base_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+// In some build configurations we pass --detect-odr-violations to the
+// gold linker. This causes it to flag weak symbol overrides as ODR
+// violations. Because ODR only applies to C++ and not C,
+// --detect-odr-violations ignores symbols not mangled with C++ names.
+// By changing our extension points to be extern "C", we dodge this
+// check.
+extern "C" {
+void AbslInternalSpinLockWake(std::atomic<uint32_t> *w, bool all);
+void AbslInternalSpinLockDelay(
+ std::atomic<uint32_t> *w, uint32_t value, int loop,
+ absl::base_internal::SchedulingMode scheduling_mode);
+}
+
+inline void absl::base_internal::SpinLockWake(std::atomic<uint32_t> *w,
+ bool all) {
+ AbslInternalSpinLockWake(w, all);
+}
+
+inline void absl::base_internal::SpinLockDelay(
+ std::atomic<uint32_t> *w, uint32_t value, int loop,
+ absl::base_internal::SchedulingMode scheduling_mode) {
+ AbslInternalSpinLockDelay(w, value, loop, scheduling_mode);
+}
+
+#endif // ABSL_BASE_INTERNAL_SPINLOCK_WAIT_H_
diff --git a/third_party/abseil/src/absl/base/internal/spinlock_win32.inc b/third_party/abseil/src/absl/base/internal/spinlock_win32.inc
new file mode 100644
index 0000000..78654b5
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/spinlock_win32.inc
@@ -0,0 +1,37 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// This file is a Win32-specific part of spinlock_wait.cc
+
+#include <windows.h>
+#include <atomic>
+#include "absl/base/internal/scheduling_mode.h"
+
+extern "C" {
+
+void AbslInternalSpinLockDelay(std::atomic<uint32_t>* /* lock_word */,
+ uint32_t /* value */, int loop,
+ absl::base_internal::SchedulingMode /* mode */) {
+ if (loop == 0) {
+ } else if (loop == 1) {
+ Sleep(0);
+ } else {
+ Sleep(absl::base_internal::SpinLockSuggestedDelayNS(loop) / 1000000);
+ }
+}
+
+void AbslInternalSpinLockWake(std::atomic<uint32_t>* /* lock_word */,
+ bool /* all */) {}
+
+} // extern "C"
diff --git a/third_party/abseil/src/absl/base/internal/strerror.cc b/third_party/abseil/src/absl/base/internal/strerror.cc
new file mode 100644
index 0000000..d66ba12
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/strerror.cc
@@ -0,0 +1,88 @@
+// Copyright 2020 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/base/internal/strerror.h"
+
+#include <array>
+#include <cerrno>
+#include <cstddef>
+#include <cstdio>
+#include <cstring>
+#include <string>
+#include <type_traits>
+
+#include "absl/base/internal/errno_saver.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace base_internal {
+namespace {
+
+const char* StrErrorAdaptor(int errnum, char* buf, size_t buflen) {
+#if defined(_WIN32)
+ int rc = strerror_s(buf, buflen, errnum);
+ buf[buflen - 1] = '\0'; // guarantee NUL termination
+ if (rc == 0 && strncmp(buf, "Unknown error", buflen) == 0) *buf = '\0';
+ return buf;
+#else
+ // The type of `ret` is platform-specific; both of these branches must compile
+ // either way but only one will execute on any given platform:
+ auto ret = strerror_r(errnum, buf, buflen);
+ if (std::is_same<decltype(ret), int>::value) {
+ // XSI `strerror_r`; `ret` is `int`:
+ if (ret) *buf = '\0';
+ return buf;
+ } else {
+ // GNU `strerror_r`; `ret` is `char *`:
+ return reinterpret_cast<const char*>(ret);
+ }
+#endif
+}
+
+std::string StrErrorInternal(int errnum) {
+ absl::base_internal::ErrnoSaver errno_saver;
+ char buf[100];
+ const char* str = StrErrorAdaptor(errnum, buf, sizeof buf);
+ if (*str == '\0') {
+ snprintf(buf, sizeof buf, "Unknown error %d", errnum);
+ str = buf;
+ }
+ return str;
+}
+
+// kSysNerr is the number of errors from a recent glibc. `StrError()` falls back
+// to `StrErrorAdaptor()` if the value is larger than this.
+constexpr int kSysNerr = 135;
+
+std::array<std::string, kSysNerr>* NewStrErrorTable() {
+ auto* table = new std::array<std::string, kSysNerr>;
+ for (int i = 0; i < static_cast<int>(table->size()); ++i) {
+ (*table)[i] = StrErrorInternal(i);
+ }
+ return table;
+}
+
+} // namespace
+
+std::string StrError(int errnum) {
+ static const auto* table = NewStrErrorTable();
+ if (errnum >= 0 && errnum < static_cast<int>(table->size())) {
+ return (*table)[errnum];
+ }
+ return StrErrorInternal(errnum);
+}
+
+} // namespace base_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/base/internal/strerror.h b/third_party/abseil/src/absl/base/internal/strerror.h
new file mode 100644
index 0000000..3500973
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/strerror.h
@@ -0,0 +1,39 @@
+// Copyright 2020 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_BASE_INTERNAL_STRERROR_H_
+#define ABSL_BASE_INTERNAL_STRERROR_H_
+
+#include <string>
+
+#include "absl/base/config.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace base_internal {
+
+// A portable and thread-safe alternative to C89's `strerror`.
+//
+// The C89 specification of `strerror` is not suitable for use in a
+// multi-threaded application as the returned string may be changed by calls to
+// `strerror` from another thread. The many non-stdlib alternatives differ
+// enough in their names, availability, and semantics to justify this wrapper
+// around them. `errno` will not be modified by a call to `absl::StrError`.
+std::string StrError(int errnum);
+
+} // namespace base_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_BASE_INTERNAL_STRERROR_H_
diff --git a/third_party/abseil/src/absl/base/internal/strerror_benchmark.cc b/third_party/abseil/src/absl/base/internal/strerror_benchmark.cc
new file mode 100644
index 0000000..c9ab14a
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/strerror_benchmark.cc
@@ -0,0 +1,29 @@
+// Copyright 2020 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <cerrno>
+#include <cstdio>
+#include <string>
+
+#include "absl/base/internal/strerror.h"
+#include "benchmark/benchmark.h"
+
+namespace {
+void BM_AbslStrError(benchmark::State& state) {
+ for (auto _ : state) {
+ benchmark::DoNotOptimize(absl::base_internal::StrError(ERANGE));
+ }
+}
+BENCHMARK(BM_AbslStrError);
+} // namespace
diff --git a/third_party/abseil/src/absl/base/internal/strerror_test.cc b/third_party/abseil/src/absl/base/internal/strerror_test.cc
new file mode 100644
index 0000000..a53da97
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/strerror_test.cc
@@ -0,0 +1,86 @@
+// Copyright 2020 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/base/internal/strerror.h"
+
+#include <atomic>
+#include <cerrno>
+#include <cstdio>
+#include <cstring>
+#include <string>
+#include <thread> // NOLINT(build/c++11)
+#include <vector>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/strings/match.h"
+
+namespace {
+using ::testing::AnyOf;
+using ::testing::Eq;
+
+TEST(StrErrorTest, ValidErrorCode) {
+ errno = ERANGE;
+ EXPECT_THAT(absl::base_internal::StrError(EDOM), Eq(strerror(EDOM)));
+ EXPECT_THAT(errno, Eq(ERANGE));
+}
+
+TEST(StrErrorTest, InvalidErrorCode) {
+ errno = ERANGE;
+ EXPECT_THAT(absl::base_internal::StrError(-1),
+ AnyOf(Eq("No error information"), Eq("Unknown error -1")));
+ EXPECT_THAT(errno, Eq(ERANGE));
+}
+
+TEST(StrErrorTest, MultipleThreads) {
+ // In this test, we will start up 2 threads and have each one call
+ // StrError 1000 times, each time with a different errnum. We
+ // expect that StrError(errnum) will return a string equal to the
+ // one returned by strerror(errnum), if the code is known. Since
+ // strerror is known to be thread-hostile, collect all the expected
+ // strings up front.
+ const int kNumCodes = 1000;
+ std::vector<std::string> expected_strings(kNumCodes);
+ for (int i = 0; i < kNumCodes; ++i) {
+ expected_strings[i] = strerror(i);
+ }
+
+ std::atomic_int counter(0);
+ auto thread_fun = [&]() {
+ for (int i = 0; i < kNumCodes; ++i) {
+ ++counter;
+ errno = ERANGE;
+ const std::string value = absl::base_internal::StrError(i);
+ // Only the GNU implementation is guaranteed to provide the
+ // string "Unknown error nnn". POSIX doesn't say anything.
+ if (!absl::StartsWith(value, "Unknown error ")) {
+ EXPECT_THAT(absl::base_internal::StrError(i), Eq(expected_strings[i]));
+ }
+ EXPECT_THAT(errno, Eq(ERANGE));
+ }
+ };
+
+ const int kNumThreads = 100;
+ std::vector<std::thread> threads;
+ for (int i = 0; i < kNumThreads; ++i) {
+ threads.push_back(std::thread(thread_fun));
+ }
+ for (auto& thread : threads) {
+ thread.join();
+ }
+
+ EXPECT_THAT(counter, Eq(kNumThreads * kNumCodes));
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/base/internal/sysinfo.cc b/third_party/abseil/src/absl/base/internal/sysinfo.cc
new file mode 100644
index 0000000..4a3b205
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/sysinfo.cc
@@ -0,0 +1,439 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/base/internal/sysinfo.h"
+
+#include "absl/base/attributes.h"
+
+#ifdef _WIN32
+#include <windows.h>
+#else
+#include <fcntl.h>
+#include <pthread.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+#endif
+
+#ifdef __linux__
+#include <sys/syscall.h>
+#endif
+
+#if defined(__APPLE__) || defined(__FreeBSD__)
+#include <sys/sysctl.h>
+#endif
+
+#if defined(__myriad2__)
+#include <rtems.h>
+#endif
+
+#include <string.h>
+
+#include <cassert>
+#include <cstdint>
+#include <cstdio>
+#include <cstdlib>
+#include <ctime>
+#include <limits>
+#include <thread> // NOLINT(build/c++11)
+#include <utility>
+#include <vector>
+
+#include "absl/base/call_once.h"
+#include "absl/base/config.h"
+#include "absl/base/internal/raw_logging.h"
+#include "absl/base/internal/spinlock.h"
+#include "absl/base/internal/unscaledcycleclock.h"
+#include "absl/base/thread_annotations.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace base_internal {
+
+static int GetNumCPUs() {
+#if defined(__myriad2__)
+ return 1;
+#else
+ // Other possibilities:
+ // - Read /sys/devices/system/cpu/online and use cpumask_parse()
+ // - sysconf(_SC_NPROCESSORS_ONLN)
+ return std::thread::hardware_concurrency();
+#endif
+}
+
+#if defined(_WIN32)
+
+static double GetNominalCPUFrequency() {
+#if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_APP) && \
+ !WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP)
+ // UWP apps don't have access to the registry and currently don't provide an
+ // API informing about CPU nominal frequency.
+ return 1.0;
+#else
+#pragma comment(lib, "advapi32.lib") // For Reg* functions.
+ HKEY key;
+ // Use the Reg* functions rather than the SH functions because shlwapi.dll
+ // pulls in gdi32.dll which makes process destruction much more costly.
+ if (RegOpenKeyExA(HKEY_LOCAL_MACHINE,
+ "HARDWARE\\DESCRIPTION\\System\\CentralProcessor\\0", 0,
+ KEY_READ, &key) == ERROR_SUCCESS) {
+ DWORD type = 0;
+ DWORD data = 0;
+ DWORD data_size = sizeof(data);
+ auto result = RegQueryValueExA(key, "~MHz", 0, &type,
+ reinterpret_cast<LPBYTE>(&data), &data_size);
+ RegCloseKey(key);
+ if (result == ERROR_SUCCESS && type == REG_DWORD &&
+ data_size == sizeof(data)) {
+ return data * 1e6; // Value is MHz.
+ }
+ }
+ return 1.0;
+#endif // WINAPI_PARTITION_APP && !WINAPI_PARTITION_DESKTOP
+}
+
+#elif defined(CTL_HW) && defined(HW_CPU_FREQ)
+
+static double GetNominalCPUFrequency() {
+ unsigned freq;
+ size_t size = sizeof(freq);
+ int mib[2] = {CTL_HW, HW_CPU_FREQ};
+ if (sysctl(mib, 2, &freq, &size, nullptr, 0) == 0) {
+ return static_cast<double>(freq);
+ }
+ return 1.0;
+}
+
+#else
+
+// Helper function for reading a long from a file. Returns true if successful
+// and the memory location pointed to by value is set to the value read.
+static bool ReadLongFromFile(const char *file, long *value) {
+ bool ret = false;
+ int fd = open(file, O_RDONLY);
+ if (fd != -1) {
+ char line[1024];
+ char *err;
+ memset(line, '\0', sizeof(line));
+ int len = read(fd, line, sizeof(line) - 1);
+ if (len <= 0) {
+ ret = false;
+ } else {
+ const long temp_value = strtol(line, &err, 10);
+ if (line[0] != '\0' && (*err == '\n' || *err == '\0')) {
+ *value = temp_value;
+ ret = true;
+ }
+ }
+ close(fd);
+ }
+ return ret;
+}
+
+#if defined(ABSL_INTERNAL_UNSCALED_CYCLECLOCK_FREQUENCY_IS_CPU_FREQUENCY)
+
+// Reads a monotonic time source and returns a value in
+// nanoseconds. The returned value uses an arbitrary epoch, not the
+// Unix epoch.
+static int64_t ReadMonotonicClockNanos() {
+ struct timespec t;
+#ifdef CLOCK_MONOTONIC_RAW
+ int rc = clock_gettime(CLOCK_MONOTONIC_RAW, &t);
+#else
+ int rc = clock_gettime(CLOCK_MONOTONIC, &t);
+#endif
+ if (rc != 0) {
+ perror("clock_gettime() failed");
+ abort();
+ }
+ return int64_t{t.tv_sec} * 1000000000 + t.tv_nsec;
+}
+
+class UnscaledCycleClockWrapperForInitializeFrequency {
+ public:
+ static int64_t Now() { return base_internal::UnscaledCycleClock::Now(); }
+};
+
+struct TimeTscPair {
+ int64_t time; // From ReadMonotonicClockNanos().
+ int64_t tsc; // From UnscaledCycleClock::Now().
+};
+
+// Returns a pair of values (monotonic kernel time, TSC ticks) that
+// approximately correspond to each other. This is accomplished by
+// doing several reads and picking the reading with the lowest
+// latency. This approach is used to minimize the probability that
+// our thread was preempted between clock reads.
+static TimeTscPair GetTimeTscPair() {
+ int64_t best_latency = std::numeric_limits<int64_t>::max();
+ TimeTscPair best;
+ for (int i = 0; i < 10; ++i) {
+ int64_t t0 = ReadMonotonicClockNanos();
+ int64_t tsc = UnscaledCycleClockWrapperForInitializeFrequency::Now();
+ int64_t t1 = ReadMonotonicClockNanos();
+ int64_t latency = t1 - t0;
+ if (latency < best_latency) {
+ best_latency = latency;
+ best.time = t0;
+ best.tsc = tsc;
+ }
+ }
+ return best;
+}
+
+// Measures and returns the TSC frequency by taking a pair of
+// measurements approximately `sleep_nanoseconds` apart.
+static double MeasureTscFrequencyWithSleep(int sleep_nanoseconds) {
+ auto t0 = GetTimeTscPair();
+ struct timespec ts;
+ ts.tv_sec = 0;
+ ts.tv_nsec = sleep_nanoseconds;
+ while (nanosleep(&ts, &ts) != 0 && errno == EINTR) {}
+ auto t1 = GetTimeTscPair();
+ double elapsed_ticks = t1.tsc - t0.tsc;
+ double elapsed_time = (t1.time - t0.time) * 1e-9;
+ return elapsed_ticks / elapsed_time;
+}
+
+// Measures and returns the TSC frequency by calling
+// MeasureTscFrequencyWithSleep(), doubling the sleep interval until the
+// frequency measurement stabilizes.
+static double MeasureTscFrequency() {
+ double last_measurement = -1.0;
+ int sleep_nanoseconds = 1000000; // 1 millisecond.
+ for (int i = 0; i < 8; ++i) {
+ double measurement = MeasureTscFrequencyWithSleep(sleep_nanoseconds);
+ if (measurement * 0.99 < last_measurement &&
+ last_measurement < measurement * 1.01) {
+ // Use the current measurement if it is within 1% of the
+ // previous measurement.
+ return measurement;
+ }
+ last_measurement = measurement;
+ sleep_nanoseconds *= 2;
+ }
+ return last_measurement;
+}
+
+#endif // ABSL_INTERNAL_UNSCALED_CYCLECLOCK_FREQUENCY_IS_CPU_FREQUENCY
+
+static double GetNominalCPUFrequency() {
+ long freq = 0;
+
+ // Google's production kernel has a patch to export the TSC
+ // frequency through sysfs. If the kernel is exporting the TSC
+ // frequency use that. There are issues where cpuinfo_max_freq
+ // cannot be relied on because the BIOS may be exporting an invalid
+ // p-state (on x86) or p-states may be used to put the processor in
+ // a new mode (turbo mode). Essentially, those frequencies cannot
+ // always be relied upon. The same reasons apply to /proc/cpuinfo as
+ // well.
+ if (ReadLongFromFile("/sys/devices/system/cpu/cpu0/tsc_freq_khz", &freq)) {
+ return freq * 1e3; // Value is kHz.
+ }
+
+#if defined(ABSL_INTERNAL_UNSCALED_CYCLECLOCK_FREQUENCY_IS_CPU_FREQUENCY)
+ // On these platforms, the TSC frequency is the nominal CPU
+ // frequency. But without having the kernel export it directly
+ // though /sys/devices/system/cpu/cpu0/tsc_freq_khz, there is no
+ // other way to reliably get the TSC frequency, so we have to
+ // measure it ourselves. Some CPUs abuse cpuinfo_max_freq by
+ // exporting "fake" frequencies for implementing new features. For
+ // example, Intel's turbo mode is enabled by exposing a p-state
+ // value with a higher frequency than that of the real TSC
+ // rate. Because of this, we prefer to measure the TSC rate
+ // ourselves on i386 and x86-64.
+ return MeasureTscFrequency();
+#else
+
+ // If CPU scaling is in effect, we want to use the *maximum*
+ // frequency, not whatever CPU speed some random processor happens
+ // to be using now.
+ if (ReadLongFromFile("/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq",
+ &freq)) {
+ return freq * 1e3; // Value is kHz.
+ }
+
+ return 1.0;
+#endif // !ABSL_INTERNAL_UNSCALED_CYCLECLOCK_FREQUENCY_IS_CPU_FREQUENCY
+}
+
+#endif
+
+ABSL_CONST_INIT static once_flag init_num_cpus_once;
+ABSL_CONST_INIT static int num_cpus = 0;
+
+// NumCPUs() may be called before main() and before malloc is properly
+// initialized, therefore this must not allocate memory.
+int NumCPUs() {
+ base_internal::LowLevelCallOnce(
+ &init_num_cpus_once, []() { num_cpus = GetNumCPUs(); });
+ return num_cpus;
+}
+
+// A default frequency of 0.0 might be dangerous if it is used in division.
+ABSL_CONST_INIT static once_flag init_nominal_cpu_frequency_once;
+ABSL_CONST_INIT static double nominal_cpu_frequency = 1.0;
+
+// NominalCPUFrequency() may be called before main() and before malloc is
+// properly initialized, therefore this must not allocate memory.
+double NominalCPUFrequency() {
+ base_internal::LowLevelCallOnce(
+ &init_nominal_cpu_frequency_once,
+ []() { nominal_cpu_frequency = GetNominalCPUFrequency(); });
+ return nominal_cpu_frequency;
+}
+
+#if defined(_WIN32)
+
+pid_t GetTID() {
+ return pid_t{GetCurrentThreadId()};
+}
+
+#elif defined(__linux__)
+
+#ifndef SYS_gettid
+#define SYS_gettid __NR_gettid
+#endif
+
+pid_t GetTID() {
+ return syscall(SYS_gettid);
+}
+
+#elif defined(__akaros__)
+
+pid_t GetTID() {
+ // Akaros has a concept of "vcore context", which is the state the program
+ // is forced into when we need to make a user-level scheduling decision, or
+ // run a signal handler. This is analogous to the interrupt context that a
+ // CPU might enter if it encounters some kind of exception.
+ //
+ // There is no current thread context in vcore context, but we need to give
+ // a reasonable answer if asked for a thread ID (e.g., in a signal handler).
+ // Thread 0 always exists, so if we are in vcore context, we return that.
+ //
+ // Otherwise, we know (since we are using pthreads) that the uthread struct
+ // current_uthread is pointing to is the first element of a
+ // struct pthread_tcb, so we extract and return the thread ID from that.
+ //
+ // TODO(dcross): Akaros anticipates moving the thread ID to the uthread
+ // structure at some point. We should modify this code to remove the cast
+ // when that happens.
+ if (in_vcore_context())
+ return 0;
+ return reinterpret_cast<struct pthread_tcb *>(current_uthread)->id;
+}
+
+#elif defined(__myriad2__)
+
+pid_t GetTID() {
+ uint32_t tid;
+ rtems_task_ident(RTEMS_SELF, 0, &tid);
+ return tid;
+}
+
+#else
+
+// Fallback implementation of GetTID using pthread_getspecific.
+ABSL_CONST_INIT static once_flag tid_once;
+ABSL_CONST_INIT static pthread_key_t tid_key;
+ABSL_CONST_INIT static absl::base_internal::SpinLock tid_lock(
+ absl::kConstInit, base_internal::SCHEDULE_KERNEL_ONLY);
+
+// We set a bit per thread in this array to indicate that an ID is in
+// use. ID 0 is unused because it is the default value returned by
+// pthread_getspecific().
+ABSL_CONST_INIT static std::vector<uint32_t> *tid_array
+ ABSL_GUARDED_BY(tid_lock) = nullptr;
+static constexpr int kBitsPerWord = 32; // tid_array is uint32_t.
+
+// Returns the TID to tid_array.
+static void FreeTID(void *v) {
+ intptr_t tid = reinterpret_cast<intptr_t>(v);
+ int word = tid / kBitsPerWord;
+ uint32_t mask = ~(1u << (tid % kBitsPerWord));
+ absl::base_internal::SpinLockHolder lock(&tid_lock);
+ assert(0 <= word && static_cast<size_t>(word) < tid_array->size());
+ (*tid_array)[word] &= mask;
+}
+
+static void InitGetTID() {
+ if (pthread_key_create(&tid_key, FreeTID) != 0) {
+ // The logging system calls GetTID() so it can't be used here.
+ perror("pthread_key_create failed");
+ abort();
+ }
+
+ // Initialize tid_array.
+ absl::base_internal::SpinLockHolder lock(&tid_lock);
+ tid_array = new std::vector<uint32_t>(1);
+ (*tid_array)[0] = 1; // ID 0 is never-allocated.
+}
+
+// Return a per-thread small integer ID from pthread's thread-specific data.
+pid_t GetTID() {
+ absl::call_once(tid_once, InitGetTID);
+
+ intptr_t tid = reinterpret_cast<intptr_t>(pthread_getspecific(tid_key));
+ if (tid != 0) {
+ return tid;
+ }
+
+ int bit; // tid_array[word] = 1u << bit;
+ size_t word;
+ {
+ // Search for the first unused ID.
+ absl::base_internal::SpinLockHolder lock(&tid_lock);
+ // First search for a word in the array that is not all ones.
+ word = 0;
+ while (word < tid_array->size() && ~(*tid_array)[word] == 0) {
+ ++word;
+ }
+ if (word == tid_array->size()) {
+ tid_array->push_back(0); // No space left, add kBitsPerWord more IDs.
+ }
+ // Search for a zero bit in the word.
+ bit = 0;
+ while (bit < kBitsPerWord && (((*tid_array)[word] >> bit) & 1) != 0) {
+ ++bit;
+ }
+ tid = (word * kBitsPerWord) + bit;
+ (*tid_array)[word] |= 1u << bit; // Mark the TID as allocated.
+ }
+
+ if (pthread_setspecific(tid_key, reinterpret_cast<void *>(tid)) != 0) {
+ perror("pthread_setspecific failed");
+ abort();
+ }
+
+ return static_cast<pid_t>(tid);
+}
+
+#endif
+
+// GetCachedTID() caches the thread ID in thread-local storage (which is a
+// userspace construct) to avoid unnecessary system calls. Without this caching,
+// it can take roughly 98ns, while it takes roughly 1ns with this caching.
+pid_t GetCachedTID() {
+#ifdef ABSL_HAVE_THREAD_LOCAL
+ static thread_local pid_t thread_id = GetTID();
+ return thread_id;
+#else
+ return GetTID();
+#endif // ABSL_HAVE_THREAD_LOCAL
+}
+
+} // namespace base_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/base/internal/sysinfo.h b/third_party/abseil/src/absl/base/internal/sysinfo.h
new file mode 100644
index 0000000..119cf1f
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/sysinfo.h
@@ -0,0 +1,74 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// This file includes routines to find out characteristics
+// of the machine a program is running on. It is undoubtedly
+// system-dependent.
+
+// Functions listed here that accept a pid_t as an argument act on the
+// current process if the pid_t argument is 0
+// All functions here are thread-hostile due to file caching unless
+// commented otherwise.
+
+#ifndef ABSL_BASE_INTERNAL_SYSINFO_H_
+#define ABSL_BASE_INTERNAL_SYSINFO_H_
+
+#ifndef _WIN32
+#include <sys/types.h>
+#endif
+
+#include <cstdint>
+
+#include "absl/base/config.h"
+#include "absl/base/port.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace base_internal {
+
+// Nominal core processor cycles per second of each processor. This is _not_
+// necessarily the frequency of the CycleClock counter (see cycleclock.h)
+// Thread-safe.
+double NominalCPUFrequency();
+
+// Number of logical processors (hyperthreads) in system. Thread-safe.
+int NumCPUs();
+
+// Return the thread id of the current thread, as told by the system.
+// No two currently-live threads implemented by the OS shall have the same ID.
+// Thread ids of exited threads may be reused. Multiple user-level threads
+// may have the same thread ID if multiplexed on the same OS thread.
+//
+// On Linux, you may send a signal to the resulting ID with kill(). However,
+// it is recommended for portability that you use pthread_kill() instead.
+#ifdef _WIN32
+// On Windows, process id and thread id are of the same type according to the
+// return types of GetProcessId() and GetThreadId() are both DWORD, an unsigned
+// 32-bit type.
+using pid_t = uint32_t;
+#endif
+pid_t GetTID();
+
+// Like GetTID(), but caches the result in thread-local storage in order
+// to avoid unnecessary system calls. Note that there are some cases where
+// one must call through to GetTID directly, which is why this exists as a
+// separate function. For example, GetCachedTID() is not safe to call in
+// an asynchronous signal-handling context nor right after a call to fork().
+pid_t GetCachedTID();
+
+} // namespace base_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_BASE_INTERNAL_SYSINFO_H_
diff --git a/third_party/abseil/src/absl/base/internal/sysinfo_test.cc b/third_party/abseil/src/absl/base/internal/sysinfo_test.cc
new file mode 100644
index 0000000..fa8b88b
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/sysinfo_test.cc
@@ -0,0 +1,100 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/base/internal/sysinfo.h"
+
+#ifndef _WIN32
+#include <sys/types.h>
+#include <unistd.h>
+#endif
+
+#include <thread> // NOLINT(build/c++11)
+#include <unordered_set>
+#include <vector>
+
+#include "gtest/gtest.h"
+#include "absl/synchronization/barrier.h"
+#include "absl/synchronization/mutex.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace base_internal {
+namespace {
+
+TEST(SysinfoTest, NumCPUs) {
+ EXPECT_NE(NumCPUs(), 0)
+ << "NumCPUs() should not have the default value of 0";
+}
+
+TEST(SysinfoTest, NominalCPUFrequency) {
+#if !(defined(__aarch64__) && defined(__linux__)) && !defined(__EMSCRIPTEN__)
+ EXPECT_GE(NominalCPUFrequency(), 1000.0)
+ << "NominalCPUFrequency() did not return a reasonable value";
+#else
+ // Aarch64 cannot read the CPU frequency from sysfs, so we get back 1.0.
+ // Emscripten does not have a sysfs to read from at all.
+ EXPECT_EQ(NominalCPUFrequency(), 1.0)
+ << "CPU frequency detection was fixed! Please update unittest.";
+#endif
+}
+
+TEST(SysinfoTest, GetTID) {
+ EXPECT_EQ(GetTID(), GetTID()); // Basic compile and equality test.
+#ifdef __native_client__
+ // Native Client has a race condition bug that leads to memory
+ // exaustion when repeatedly creating and joining threads.
+ // https://bugs.chromium.org/p/nativeclient/issues/detail?id=1027
+ return;
+#endif
+ // Test that TIDs are unique to each thread.
+ // Uses a few loops to exercise implementations that reallocate IDs.
+ for (int i = 0; i < 10; ++i) {
+ constexpr int kNumThreads = 10;
+ Barrier all_threads_done(kNumThreads);
+ std::vector<std::thread> threads;
+
+ Mutex mutex;
+ std::unordered_set<pid_t> tids;
+
+ for (int j = 0; j < kNumThreads; ++j) {
+ threads.push_back(std::thread([&]() {
+ pid_t id = GetTID();
+ {
+ MutexLock lock(&mutex);
+ ASSERT_TRUE(tids.find(id) == tids.end());
+ tids.insert(id);
+ }
+ // We can't simply join the threads here. The threads need to
+ // be alive otherwise the TID might have been reallocated to
+ // another live thread.
+ all_threads_done.Block();
+ }));
+ }
+ for (auto& thread : threads) {
+ thread.join();
+ }
+ }
+}
+
+#ifdef __linux__
+TEST(SysinfoTest, LinuxGetTID) {
+ // On Linux, for the main thread, GetTID()==getpid() is guaranteed by the API.
+ EXPECT_EQ(GetTID(), getpid());
+}
+#endif
+
+} // namespace
+} // namespace base_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/base/internal/thread_annotations.h b/third_party/abseil/src/absl/base/internal/thread_annotations.h
new file mode 100644
index 0000000..4dab6a9
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/thread_annotations.h
@@ -0,0 +1,271 @@
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: thread_annotations.h
+// -----------------------------------------------------------------------------
+//
+// WARNING: This is a backwards compatible header and it will be removed after
+// the migration to prefixed thread annotations is finished; please include
+// "absl/base/thread_annotations.h".
+//
+// This header file contains macro definitions for thread safety annotations
+// that allow developers to document the locking policies of multi-threaded
+// code. The annotations can also help program analysis tools to identify
+// potential thread safety issues.
+//
+// These annotations are implemented using compiler attributes. Using the macros
+// defined here instead of raw attributes allow for portability and future
+// compatibility.
+//
+// When referring to mutexes in the arguments of the attributes, you should
+// use variable names or more complex expressions (e.g. my_object->mutex_)
+// that evaluate to a concrete mutex object whenever possible. If the mutex
+// you want to refer to is not in scope, you may use a member pointer
+// (e.g. &MyClass::mutex_) to refer to a mutex in some (unknown) object.
+
+#ifndef ABSL_BASE_INTERNAL_THREAD_ANNOTATIONS_H_
+#define ABSL_BASE_INTERNAL_THREAD_ANNOTATIONS_H_
+
+#if defined(__clang__)
+#define THREAD_ANNOTATION_ATTRIBUTE__(x) __attribute__((x))
+#else
+#define THREAD_ANNOTATION_ATTRIBUTE__(x) // no-op
+#endif
+
+// GUARDED_BY()
+//
+// Documents if a shared field or global variable needs to be protected by a
+// mutex. GUARDED_BY() allows the user to specify a particular mutex that
+// should be held when accessing the annotated variable.
+//
+// Although this annotation (and PT_GUARDED_BY, below) cannot be applied to
+// local variables, a local variable and its associated mutex can often be
+// combined into a small class or struct, thereby allowing the annotation.
+//
+// Example:
+//
+// class Foo {
+// Mutex mu_;
+// int p1_ GUARDED_BY(mu_);
+// ...
+// };
+#define GUARDED_BY(x) THREAD_ANNOTATION_ATTRIBUTE__(guarded_by(x))
+
+// PT_GUARDED_BY()
+//
+// Documents if the memory location pointed to by a pointer should be guarded
+// by a mutex when dereferencing the pointer.
+//
+// Example:
+// class Foo {
+// Mutex mu_;
+// int *p1_ PT_GUARDED_BY(mu_);
+// ...
+// };
+//
+// Note that a pointer variable to a shared memory location could itself be a
+// shared variable.
+//
+// Example:
+//
+// // `q_`, guarded by `mu1_`, points to a shared memory location that is
+// // guarded by `mu2_`:
+// int *q_ GUARDED_BY(mu1_) PT_GUARDED_BY(mu2_);
+#define PT_GUARDED_BY(x) THREAD_ANNOTATION_ATTRIBUTE__(pt_guarded_by(x))
+
+// ACQUIRED_AFTER() / ACQUIRED_BEFORE()
+//
+// Documents the acquisition order between locks that can be held
+// simultaneously by a thread. For any two locks that need to be annotated
+// to establish an acquisition order, only one of them needs the annotation.
+// (i.e. You don't have to annotate both locks with both ACQUIRED_AFTER
+// and ACQUIRED_BEFORE.)
+//
+// As with GUARDED_BY, this is only applicable to mutexes that are shared
+// fields or global variables.
+//
+// Example:
+//
+// Mutex m1_;
+// Mutex m2_ ACQUIRED_AFTER(m1_);
+#define ACQUIRED_AFTER(...) \
+ THREAD_ANNOTATION_ATTRIBUTE__(acquired_after(__VA_ARGS__))
+
+#define ACQUIRED_BEFORE(...) \
+ THREAD_ANNOTATION_ATTRIBUTE__(acquired_before(__VA_ARGS__))
+
+// EXCLUSIVE_LOCKS_REQUIRED() / SHARED_LOCKS_REQUIRED()
+//
+// Documents a function that expects a mutex to be held prior to entry.
+// The mutex is expected to be held both on entry to, and exit from, the
+// function.
+//
+// An exclusive lock allows read-write access to the guarded data member(s), and
+// only one thread can acquire a lock exclusively at any one time. A shared lock
+// allows read-only access, and any number of threads can acquire a shared lock
+// concurrently.
+//
+// Generally, non-const methods should be annotated with
+// EXCLUSIVE_LOCKS_REQUIRED, while const methods should be annotated with
+// SHARED_LOCKS_REQUIRED.
+//
+// Example:
+//
+// Mutex mu1, mu2;
+// int a GUARDED_BY(mu1);
+// int b GUARDED_BY(mu2);
+//
+// void foo() EXCLUSIVE_LOCKS_REQUIRED(mu1, mu2) { ... }
+// void bar() const SHARED_LOCKS_REQUIRED(mu1, mu2) { ... }
+#define EXCLUSIVE_LOCKS_REQUIRED(...) \
+ THREAD_ANNOTATION_ATTRIBUTE__(exclusive_locks_required(__VA_ARGS__))
+
+#define SHARED_LOCKS_REQUIRED(...) \
+ THREAD_ANNOTATION_ATTRIBUTE__(shared_locks_required(__VA_ARGS__))
+
+// LOCKS_EXCLUDED()
+//
+// Documents the locks acquired in the body of the function. These locks
+// cannot be held when calling this function (as Abseil's `Mutex` locks are
+// non-reentrant).
+#define LOCKS_EXCLUDED(...) \
+ THREAD_ANNOTATION_ATTRIBUTE__(locks_excluded(__VA_ARGS__))
+
+// LOCK_RETURNED()
+//
+// Documents a function that returns a mutex without acquiring it. For example,
+// a public getter method that returns a pointer to a private mutex should
+// be annotated with LOCK_RETURNED.
+#define LOCK_RETURNED(x) \
+ THREAD_ANNOTATION_ATTRIBUTE__(lock_returned(x))
+
+// LOCKABLE
+//
+// Documents if a class/type is a lockable type (such as the `Mutex` class).
+#define LOCKABLE \
+ THREAD_ANNOTATION_ATTRIBUTE__(lockable)
+
+// SCOPED_LOCKABLE
+//
+// Documents if a class does RAII locking (such as the `MutexLock` class).
+// The constructor should use `LOCK_FUNCTION()` to specify the mutex that is
+// acquired, and the destructor should use `UNLOCK_FUNCTION()` with no
+// arguments; the analysis will assume that the destructor unlocks whatever the
+// constructor locked.
+#define SCOPED_LOCKABLE \
+ THREAD_ANNOTATION_ATTRIBUTE__(scoped_lockable)
+
+// EXCLUSIVE_LOCK_FUNCTION()
+//
+// Documents functions that acquire a lock in the body of a function, and do
+// not release it.
+#define EXCLUSIVE_LOCK_FUNCTION(...) \
+ THREAD_ANNOTATION_ATTRIBUTE__(exclusive_lock_function(__VA_ARGS__))
+
+// SHARED_LOCK_FUNCTION()
+//
+// Documents functions that acquire a shared (reader) lock in the body of a
+// function, and do not release it.
+#define SHARED_LOCK_FUNCTION(...) \
+ THREAD_ANNOTATION_ATTRIBUTE__(shared_lock_function(__VA_ARGS__))
+
+// UNLOCK_FUNCTION()
+//
+// Documents functions that expect a lock to be held on entry to the function,
+// and release it in the body of the function.
+#define UNLOCK_FUNCTION(...) \
+ THREAD_ANNOTATION_ATTRIBUTE__(unlock_function(__VA_ARGS__))
+
+// EXCLUSIVE_TRYLOCK_FUNCTION() / SHARED_TRYLOCK_FUNCTION()
+//
+// Documents functions that try to acquire a lock, and return success or failure
+// (or a non-boolean value that can be interpreted as a boolean).
+// The first argument should be `true` for functions that return `true` on
+// success, or `false` for functions that return `false` on success. The second
+// argument specifies the mutex that is locked on success. If unspecified, this
+// mutex is assumed to be `this`.
+#define EXCLUSIVE_TRYLOCK_FUNCTION(...) \
+ THREAD_ANNOTATION_ATTRIBUTE__(exclusive_trylock_function(__VA_ARGS__))
+
+#define SHARED_TRYLOCK_FUNCTION(...) \
+ THREAD_ANNOTATION_ATTRIBUTE__(shared_trylock_function(__VA_ARGS__))
+
+// ASSERT_EXCLUSIVE_LOCK() / ASSERT_SHARED_LOCK()
+//
+// Documents functions that dynamically check to see if a lock is held, and fail
+// if it is not held.
+#define ASSERT_EXCLUSIVE_LOCK(...) \
+ THREAD_ANNOTATION_ATTRIBUTE__(assert_exclusive_lock(__VA_ARGS__))
+
+#define ASSERT_SHARED_LOCK(...) \
+ THREAD_ANNOTATION_ATTRIBUTE__(assert_shared_lock(__VA_ARGS__))
+
+// NO_THREAD_SAFETY_ANALYSIS
+//
+// Turns off thread safety checking within the body of a particular function.
+// This annotation is used to mark functions that are known to be correct, but
+// the locking behavior is more complicated than the analyzer can handle.
+#define NO_THREAD_SAFETY_ANALYSIS \
+ THREAD_ANNOTATION_ATTRIBUTE__(no_thread_safety_analysis)
+
+//------------------------------------------------------------------------------
+// Tool-Supplied Annotations
+//------------------------------------------------------------------------------
+
+// TS_UNCHECKED should be placed around lock expressions that are not valid
+// C++ syntax, but which are present for documentation purposes. These
+// annotations will be ignored by the analysis.
+#define TS_UNCHECKED(x) ""
+
+// TS_FIXME is used to mark lock expressions that are not valid C++ syntax.
+// It is used by automated tools to mark and disable invalid expressions.
+// The annotation should either be fixed, or changed to TS_UNCHECKED.
+#define TS_FIXME(x) ""
+
+// Like NO_THREAD_SAFETY_ANALYSIS, this turns off checking within the body of
+// a particular function. However, this attribute is used to mark functions
+// that are incorrect and need to be fixed. It is used by automated tools to
+// avoid breaking the build when the analysis is updated.
+// Code owners are expected to eventually fix the routine.
+#define NO_THREAD_SAFETY_ANALYSIS_FIXME NO_THREAD_SAFETY_ANALYSIS
+
+// Similar to NO_THREAD_SAFETY_ANALYSIS_FIXME, this macro marks a GUARDED_BY
+// annotation that needs to be fixed, because it is producing thread safety
+// warning. It disables the GUARDED_BY.
+#define GUARDED_BY_FIXME(x)
+
+// Disables warnings for a single read operation. This can be used to avoid
+// warnings when it is known that the read is not actually involved in a race,
+// but the compiler cannot confirm that.
+#define TS_UNCHECKED_READ(x) thread_safety_analysis::ts_unchecked_read(x)
+
+
+namespace thread_safety_analysis {
+
+// Takes a reference to a guarded data member, and returns an unguarded
+// reference.
+template <typename T>
+inline const T& ts_unchecked_read(const T& v) NO_THREAD_SAFETY_ANALYSIS {
+ return v;
+}
+
+template <typename T>
+inline T& ts_unchecked_read(T& v) NO_THREAD_SAFETY_ANALYSIS {
+ return v;
+}
+
+} // namespace thread_safety_analysis
+
+#endif // ABSL_BASE_INTERNAL_THREAD_ANNOTATIONS_H_
diff --git a/third_party/abseil/src/absl/base/internal/thread_identity.cc b/third_party/abseil/src/absl/base/internal/thread_identity.cc
new file mode 100644
index 0000000..6ea010e
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/thread_identity.cc
@@ -0,0 +1,155 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/base/internal/thread_identity.h"
+
+#ifndef _WIN32
+#include <pthread.h>
+#include <signal.h>
+#endif
+
+#include <atomic>
+#include <cassert>
+#include <memory>
+
+#include "absl/base/attributes.h"
+#include "absl/base/call_once.h"
+#include "absl/base/internal/raw_logging.h"
+#include "absl/base/internal/spinlock.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace base_internal {
+
+#if ABSL_THREAD_IDENTITY_MODE != ABSL_THREAD_IDENTITY_MODE_USE_CPP11
+namespace {
+// Used to co-ordinate one-time creation of our pthread_key
+absl::once_flag init_thread_identity_key_once;
+pthread_key_t thread_identity_pthread_key;
+std::atomic<bool> pthread_key_initialized(false);
+
+void AllocateThreadIdentityKey(ThreadIdentityReclaimerFunction reclaimer) {
+ pthread_key_create(&thread_identity_pthread_key, reclaimer);
+ pthread_key_initialized.store(true, std::memory_order_release);
+}
+} // namespace
+#endif
+
+#if ABSL_THREAD_IDENTITY_MODE == ABSL_THREAD_IDENTITY_MODE_USE_TLS || \
+ ABSL_THREAD_IDENTITY_MODE == ABSL_THREAD_IDENTITY_MODE_USE_CPP11
+// The actual TLS storage for a thread's currently associated ThreadIdentity.
+// This is referenced by inline accessors in the header.
+// "protected" visibility ensures that if multiple instances of Abseil code
+// exist within a process (via dlopen() or similar), references to
+// thread_identity_ptr from each instance of the code will refer to
+// *different* instances of this ptr.
+// Apple platforms have the visibility attribute, but issue a compile warning
+// that protected visibility is unsupported.
+#if ABSL_HAVE_ATTRIBUTE(visibility) && !defined(__APPLE__)
+__attribute__((visibility("protected")))
+#endif // ABSL_HAVE_ATTRIBUTE(visibility) && !defined(__APPLE__)
+#if ABSL_PER_THREAD_TLS
+// Prefer __thread to thread_local as benchmarks indicate it is a bit faster.
+ABSL_PER_THREAD_TLS_KEYWORD ThreadIdentity* thread_identity_ptr = nullptr;
+#elif defined(ABSL_HAVE_THREAD_LOCAL)
+thread_local ThreadIdentity* thread_identity_ptr = nullptr;
+#endif // ABSL_PER_THREAD_TLS
+#endif // TLS or CPP11
+
+void SetCurrentThreadIdentity(
+ ThreadIdentity* identity, ThreadIdentityReclaimerFunction reclaimer) {
+ assert(CurrentThreadIdentityIfPresent() == nullptr);
+ // Associate our destructor.
+ // NOTE: This call to pthread_setspecific is currently the only immovable
+ // barrier to CurrentThreadIdentity() always being async signal safe.
+#if ABSL_THREAD_IDENTITY_MODE == ABSL_THREAD_IDENTITY_MODE_USE_POSIX_SETSPECIFIC
+ // NOTE: Not async-safe. But can be open-coded.
+ absl::call_once(init_thread_identity_key_once, AllocateThreadIdentityKey,
+ reclaimer);
+
+#if defined(__EMSCRIPTEN__) || defined(__MINGW32__)
+ // Emscripten and MinGW pthread implementations does not support signals.
+ // See https://kripken.github.io/emscripten-site/docs/porting/pthreads.html
+ // for more information.
+ pthread_setspecific(thread_identity_pthread_key,
+ reinterpret_cast<void*>(identity));
+#else
+ // We must mask signals around the call to setspecific as with current glibc,
+ // a concurrent getspecific (needed for GetCurrentThreadIdentityIfPresent())
+ // may zero our value.
+ //
+ // While not officially async-signal safe, getspecific within a signal handler
+ // is otherwise OK.
+ sigset_t all_signals;
+ sigset_t curr_signals;
+ sigfillset(&all_signals);
+ pthread_sigmask(SIG_SETMASK, &all_signals, &curr_signals);
+ pthread_setspecific(thread_identity_pthread_key,
+ reinterpret_cast<void*>(identity));
+ pthread_sigmask(SIG_SETMASK, &curr_signals, nullptr);
+#endif // !__EMSCRIPTEN__ && !__MINGW32__
+
+#elif ABSL_THREAD_IDENTITY_MODE == ABSL_THREAD_IDENTITY_MODE_USE_TLS
+ // NOTE: Not async-safe. But can be open-coded.
+ absl::call_once(init_thread_identity_key_once, AllocateThreadIdentityKey,
+ reclaimer);
+ pthread_setspecific(thread_identity_pthread_key,
+ reinterpret_cast<void*>(identity));
+ thread_identity_ptr = identity;
+#elif ABSL_THREAD_IDENTITY_MODE == ABSL_THREAD_IDENTITY_MODE_USE_CPP11
+ thread_local std::unique_ptr<ThreadIdentity, ThreadIdentityReclaimerFunction>
+ holder(identity, reclaimer);
+ thread_identity_ptr = identity;
+#else
+#error Unimplemented ABSL_THREAD_IDENTITY_MODE
+#endif
+}
+
+#if ABSL_THREAD_IDENTITY_MODE == ABSL_THREAD_IDENTITY_MODE_USE_TLS || \
+ ABSL_THREAD_IDENTITY_MODE == ABSL_THREAD_IDENTITY_MODE_USE_CPP11
+
+// Please see the comment on `CurrentThreadIdentityIfPresent` in
+// thread_identity.h. Because DLLs cannot expose thread_local variables in
+// headers, we opt for the correct-but-slower option of placing the definition
+// of this function only in a translation unit inside DLL.
+#if defined(ABSL_BUILD_DLL) || defined(ABSL_CONSUME_DLL)
+ThreadIdentity* CurrentThreadIdentityIfPresent() { return thread_identity_ptr; }
+#endif
+#endif
+
+void ClearCurrentThreadIdentity() {
+#if ABSL_THREAD_IDENTITY_MODE == ABSL_THREAD_IDENTITY_MODE_USE_TLS || \
+ ABSL_THREAD_IDENTITY_MODE == ABSL_THREAD_IDENTITY_MODE_USE_CPP11
+ thread_identity_ptr = nullptr;
+#elif ABSL_THREAD_IDENTITY_MODE == \
+ ABSL_THREAD_IDENTITY_MODE_USE_POSIX_SETSPECIFIC
+ // pthread_setspecific expected to clear value on destruction
+ assert(CurrentThreadIdentityIfPresent() == nullptr);
+#endif
+}
+
+#if ABSL_THREAD_IDENTITY_MODE == ABSL_THREAD_IDENTITY_MODE_USE_POSIX_SETSPECIFIC
+ThreadIdentity* CurrentThreadIdentityIfPresent() {
+ bool initialized = pthread_key_initialized.load(std::memory_order_acquire);
+ if (!initialized) {
+ return nullptr;
+ }
+ return reinterpret_cast<ThreadIdentity*>(
+ pthread_getspecific(thread_identity_pthread_key));
+}
+#endif
+
+} // namespace base_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/base/internal/thread_identity.h b/third_party/abseil/src/absl/base/internal/thread_identity.h
new file mode 100644
index 0000000..d2a65fd
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/thread_identity.h
@@ -0,0 +1,260 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// Each active thread has an ThreadIdentity that may represent the thread in
+// various level interfaces. ThreadIdentity objects are never deallocated.
+// When a thread terminates, its ThreadIdentity object may be reused for a
+// thread created later.
+
+#ifndef ABSL_BASE_INTERNAL_THREAD_IDENTITY_H_
+#define ABSL_BASE_INTERNAL_THREAD_IDENTITY_H_
+
+#ifndef _WIN32
+#include <pthread.h>
+// Defines __GOOGLE_GRTE_VERSION__ (via glibc-specific features.h) when
+// supported.
+#include <unistd.h>
+#endif
+
+#include <atomic>
+#include <cstdint>
+
+#include "absl/base/config.h"
+#include "absl/base/internal/per_thread_tls.h"
+#include "absl/base/optimization.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+struct SynchLocksHeld;
+struct SynchWaitParams;
+
+namespace base_internal {
+
+class SpinLock;
+struct ThreadIdentity;
+
+// Used by the implementation of absl::Mutex and absl::CondVar.
+struct PerThreadSynch {
+ // The internal representation of absl::Mutex and absl::CondVar rely
+ // on the alignment of PerThreadSynch. Both store the address of the
+ // PerThreadSynch in the high-order bits of their internal state,
+ // which means the low kLowZeroBits of the address of PerThreadSynch
+ // must be zero.
+ static constexpr int kLowZeroBits = 8;
+ static constexpr int kAlignment = 1 << kLowZeroBits;
+
+ // Returns the associated ThreadIdentity.
+ // This can be implemented as a cast because we guarantee
+ // PerThreadSynch is the first element of ThreadIdentity.
+ ThreadIdentity* thread_identity() {
+ return reinterpret_cast<ThreadIdentity*>(this);
+ }
+
+ PerThreadSynch *next; // Circular waiter queue; initialized to 0.
+ PerThreadSynch *skip; // If non-zero, all entries in Mutex queue
+ // up to and including "skip" have same
+ // condition as this, and will be woken later
+ bool may_skip; // if false while on mutex queue, a mutex unlocker
+ // is using this PerThreadSynch as a terminator. Its
+ // skip field must not be filled in because the loop
+ // might then skip over the terminator.
+ bool wake; // This thread is to be woken from a Mutex.
+ // If "x" is on a waiter list for a mutex, "x->cond_waiter" is true iff the
+ // waiter is waiting on the mutex as part of a CV Wait or Mutex Await.
+ //
+ // The value of "x->cond_waiter" is meaningless if "x" is not on a
+ // Mutex waiter list.
+ bool cond_waiter;
+ bool maybe_unlocking; // Valid at head of Mutex waiter queue;
+ // true if UnlockSlow could be searching
+ // for a waiter to wake. Used for an optimization
+ // in Enqueue(). true is always a valid value.
+ // Can be reset to false when the unlocker or any
+ // writer releases the lock, or a reader fully
+ // releases the lock. It may not be set to false
+ // by a reader that decrements the count to
+ // non-zero. protected by mutex spinlock
+ bool suppress_fatal_errors; // If true, try to proceed even in the face
+ // of broken invariants. This is used within
+ // fatal signal handlers to improve the
+ // chances of debug logging information being
+ // output successfully.
+ int priority; // Priority of thread (updated every so often).
+
+ // State values:
+ // kAvailable: This PerThreadSynch is available.
+ // kQueued: This PerThreadSynch is unavailable, it's currently queued on a
+ // Mutex or CondVar waistlist.
+ //
+ // Transitions from kQueued to kAvailable require a release
+ // barrier. This is needed as a waiter may use "state" to
+ // independently observe that it's no longer queued.
+ //
+ // Transitions from kAvailable to kQueued require no barrier, they
+ // are externally ordered by the Mutex.
+ enum State {
+ kAvailable,
+ kQueued
+ };
+ std::atomic<State> state;
+
+ // The wait parameters of the current wait. waitp is null if the
+ // thread is not waiting. Transitions from null to non-null must
+ // occur before the enqueue commit point (state = kQueued in
+ // Enqueue() and CondVarEnqueue()). Transitions from non-null to
+ // null must occur after the wait is finished (state = kAvailable in
+ // Mutex::Block() and CondVar::WaitCommon()). This field may be
+ // changed only by the thread that describes this PerThreadSynch. A
+ // special case is Fer(), which calls Enqueue() on another thread,
+ // but with an identical SynchWaitParams pointer, thus leaving the
+ // pointer unchanged.
+ SynchWaitParams* waitp;
+
+ intptr_t readers; // Number of readers in mutex.
+
+ // When priority will next be read (cycles).
+ int64_t next_priority_read_cycles;
+
+ // Locks held; used during deadlock detection.
+ // Allocated in Synch_GetAllLocks() and freed in ReclaimThreadIdentity().
+ SynchLocksHeld *all_locks;
+};
+
+// The instances of this class are allocated in NewThreadIdentity() with an
+// alignment of PerThreadSynch::kAlignment.
+struct ThreadIdentity {
+ // Must be the first member. The Mutex implementation requires that
+ // the PerThreadSynch object associated with each thread is
+ // PerThreadSynch::kAlignment aligned. We provide this alignment on
+ // ThreadIdentity itself.
+ PerThreadSynch per_thread_synch;
+
+ // Private: Reserved for absl::synchronization_internal::Waiter.
+ struct WaiterState {
+ char data[128];
+ } waiter_state;
+
+ // Used by PerThreadSem::{Get,Set}ThreadBlockedCounter().
+ std::atomic<int>* blocked_count_ptr;
+
+ // The following variables are mostly read/written just by the
+ // thread itself. The only exception is that these are read by
+ // a ticker thread as a hint.
+ std::atomic<int> ticker; // Tick counter, incremented once per second.
+ std::atomic<int> wait_start; // Ticker value when thread started waiting.
+ std::atomic<bool> is_idle; // Has thread become idle yet?
+
+ ThreadIdentity* next;
+};
+
+// Returns the ThreadIdentity object representing the calling thread; guaranteed
+// to be unique for its lifetime. The returned object will remain valid for the
+// program's lifetime; although it may be re-assigned to a subsequent thread.
+// If one does not exist, return nullptr instead.
+//
+// Does not malloc(*), and is async-signal safe.
+// [*] Technically pthread_setspecific() does malloc on first use; however this
+// is handled internally within tcmalloc's initialization already.
+//
+// New ThreadIdentity objects can be constructed and associated with a thread
+// by calling GetOrCreateCurrentThreadIdentity() in per-thread-sem.h.
+ThreadIdentity* CurrentThreadIdentityIfPresent();
+
+using ThreadIdentityReclaimerFunction = void (*)(void*);
+
+// Sets the current thread identity to the given value. 'reclaimer' is a
+// pointer to the global function for cleaning up instances on thread
+// destruction.
+void SetCurrentThreadIdentity(ThreadIdentity* identity,
+ ThreadIdentityReclaimerFunction reclaimer);
+
+// Removes the currently associated ThreadIdentity from the running thread.
+// This must be called from inside the ThreadIdentityReclaimerFunction, and only
+// from that function.
+void ClearCurrentThreadIdentity();
+
+// May be chosen at compile time via: -DABSL_FORCE_THREAD_IDENTITY_MODE=<mode
+// index>
+#ifdef ABSL_THREAD_IDENTITY_MODE_USE_POSIX_SETSPECIFIC
+#error ABSL_THREAD_IDENTITY_MODE_USE_POSIX_SETSPECIFIC cannot be direcly set
+#else
+#define ABSL_THREAD_IDENTITY_MODE_USE_POSIX_SETSPECIFIC 0
+#endif
+
+#ifdef ABSL_THREAD_IDENTITY_MODE_USE_TLS
+#error ABSL_THREAD_IDENTITY_MODE_USE_TLS cannot be direcly set
+#else
+#define ABSL_THREAD_IDENTITY_MODE_USE_TLS 1
+#endif
+
+#ifdef ABSL_THREAD_IDENTITY_MODE_USE_CPP11
+#error ABSL_THREAD_IDENTITY_MODE_USE_CPP11 cannot be direcly set
+#else
+#define ABSL_THREAD_IDENTITY_MODE_USE_CPP11 2
+#endif
+
+#ifdef ABSL_THREAD_IDENTITY_MODE
+#error ABSL_THREAD_IDENTITY_MODE cannot be direcly set
+#elif defined(ABSL_FORCE_THREAD_IDENTITY_MODE)
+#define ABSL_THREAD_IDENTITY_MODE ABSL_FORCE_THREAD_IDENTITY_MODE
+#elif defined(_WIN32) && !defined(__MINGW32__)
+#define ABSL_THREAD_IDENTITY_MODE ABSL_THREAD_IDENTITY_MODE_USE_CPP11
+#elif defined(__APPLE__) && defined(ABSL_HAVE_THREAD_LOCAL)
+#define ABSL_THREAD_IDENTITY_MODE ABSL_THREAD_IDENTITY_MODE_USE_CPP11
+#elif ABSL_PER_THREAD_TLS && defined(__GOOGLE_GRTE_VERSION__) && \
+ (__GOOGLE_GRTE_VERSION__ >= 20140228L)
+// Support for async-safe TLS was specifically added in GRTEv4. It's not
+// present in the upstream eglibc.
+// Note: Current default for production systems.
+#define ABSL_THREAD_IDENTITY_MODE ABSL_THREAD_IDENTITY_MODE_USE_TLS
+#else
+#define ABSL_THREAD_IDENTITY_MODE \
+ ABSL_THREAD_IDENTITY_MODE_USE_POSIX_SETSPECIFIC
+#endif
+
+#if ABSL_THREAD_IDENTITY_MODE == ABSL_THREAD_IDENTITY_MODE_USE_TLS || \
+ ABSL_THREAD_IDENTITY_MODE == ABSL_THREAD_IDENTITY_MODE_USE_CPP11
+
+#if ABSL_PER_THREAD_TLS
+ABSL_CONST_INIT extern ABSL_PER_THREAD_TLS_KEYWORD ThreadIdentity*
+ thread_identity_ptr;
+#elif defined(ABSL_HAVE_THREAD_LOCAL)
+ABSL_CONST_INIT extern thread_local ThreadIdentity* thread_identity_ptr;
+#else
+#error Thread-local storage not detected on this platform
+#endif
+
+// thread_local variables cannot be in headers exposed by DLLs. However, it is
+// important for performance reasons in general that
+// `CurrentThreadIdentityIfPresent` be inlined. This is not possible across a
+// DLL boundary so, with DLLs, we opt to have the function not be inlined. Note
+// that `CurrentThreadIdentityIfPresent` is declared above so we can exclude
+// this entire inline definition when compiling as a DLL.
+#if !defined(ABSL_BUILD_DLL) && !defined(ABSL_CONSUME_DLL)
+inline ThreadIdentity* CurrentThreadIdentityIfPresent() {
+ return thread_identity_ptr;
+}
+#endif
+
+#elif ABSL_THREAD_IDENTITY_MODE != \
+ ABSL_THREAD_IDENTITY_MODE_USE_POSIX_SETSPECIFIC
+#error Unknown ABSL_THREAD_IDENTITY_MODE
+#endif
+
+} // namespace base_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_BASE_INTERNAL_THREAD_IDENTITY_H_
diff --git a/third_party/abseil/src/absl/base/internal/thread_identity_benchmark.cc b/third_party/abseil/src/absl/base/internal/thread_identity_benchmark.cc
new file mode 100644
index 0000000..0ae10f2
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/thread_identity_benchmark.cc
@@ -0,0 +1,38 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "benchmark/benchmark.h"
+#include "absl/base/internal/thread_identity.h"
+#include "absl/synchronization/internal/create_thread_identity.h"
+#include "absl/synchronization/internal/per_thread_sem.h"
+
+namespace {
+
+void BM_SafeCurrentThreadIdentity(benchmark::State& state) {
+ for (auto _ : state) {
+ benchmark::DoNotOptimize(
+ absl::synchronization_internal::GetOrCreateCurrentThreadIdentity());
+ }
+}
+BENCHMARK(BM_SafeCurrentThreadIdentity);
+
+void BM_UnsafeCurrentThreadIdentity(benchmark::State& state) {
+ for (auto _ : state) {
+ benchmark::DoNotOptimize(
+ absl::base_internal::CurrentThreadIdentityIfPresent());
+ }
+}
+BENCHMARK(BM_UnsafeCurrentThreadIdentity);
+
+} // namespace
diff --git a/third_party/abseil/src/absl/base/internal/thread_identity_test.cc b/third_party/abseil/src/absl/base/internal/thread_identity_test.cc
new file mode 100644
index 0000000..46a6f74
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/thread_identity_test.cc
@@ -0,0 +1,129 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/base/internal/thread_identity.h"
+
+#include <thread> // NOLINT(build/c++11)
+#include <vector>
+
+#include "gtest/gtest.h"
+#include "absl/base/attributes.h"
+#include "absl/base/internal/spinlock.h"
+#include "absl/base/macros.h"
+#include "absl/base/thread_annotations.h"
+#include "absl/synchronization/internal/per_thread_sem.h"
+#include "absl/synchronization/mutex.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace base_internal {
+namespace {
+
+ABSL_CONST_INIT static absl::base_internal::SpinLock map_lock(
+ absl::kConstInit, base_internal::SCHEDULE_KERNEL_ONLY);
+ABSL_CONST_INIT static int num_identities_reused ABSL_GUARDED_BY(map_lock);
+
+static const void* const kCheckNoIdentity = reinterpret_cast<void*>(1);
+
+static void TestThreadIdentityCurrent(const void* assert_no_identity) {
+ ThreadIdentity* identity;
+
+ // We have to test this conditionally, because if the test framework relies
+ // on Abseil, then some previous action may have already allocated an
+ // identity.
+ if (assert_no_identity == kCheckNoIdentity) {
+ identity = CurrentThreadIdentityIfPresent();
+ EXPECT_TRUE(identity == nullptr);
+ }
+
+ identity = synchronization_internal::GetOrCreateCurrentThreadIdentity();
+ EXPECT_TRUE(identity != nullptr);
+ ThreadIdentity* identity_no_init;
+ identity_no_init = CurrentThreadIdentityIfPresent();
+ EXPECT_TRUE(identity == identity_no_init);
+
+ // Check that per_thread_synch is correctly aligned.
+ EXPECT_EQ(0, reinterpret_cast<intptr_t>(&identity->per_thread_synch) %
+ PerThreadSynch::kAlignment);
+ EXPECT_EQ(identity, identity->per_thread_synch.thread_identity());
+
+ absl::base_internal::SpinLockHolder l(&map_lock);
+ num_identities_reused++;
+}
+
+TEST(ThreadIdentityTest, BasicIdentityWorks) {
+ // This tests for the main() thread.
+ TestThreadIdentityCurrent(nullptr);
+}
+
+TEST(ThreadIdentityTest, BasicIdentityWorksThreaded) {
+ // Now try the same basic test with multiple threads being created and
+ // destroyed. This makes sure that:
+ // - New threads are created without a ThreadIdentity.
+ // - We re-allocate ThreadIdentity objects from the free-list.
+ // - If a thread implementation chooses to recycle threads, that
+ // correct re-initialization occurs.
+ static const int kNumLoops = 3;
+ static const int kNumThreads = 32;
+ for (int iter = 0; iter < kNumLoops; iter++) {
+ std::vector<std::thread> threads;
+ for (int i = 0; i < kNumThreads; ++i) {
+ threads.push_back(
+ std::thread(TestThreadIdentityCurrent, kCheckNoIdentity));
+ }
+ for (auto& thread : threads) {
+ thread.join();
+ }
+ }
+
+ // We should have recycled ThreadIdentity objects above; while (external)
+ // library threads allocating their own identities may preclude some
+ // reuse, we should have sufficient repetitions to exclude this.
+ absl::base_internal::SpinLockHolder l(&map_lock);
+ EXPECT_LT(kNumThreads, num_identities_reused);
+}
+
+TEST(ThreadIdentityTest, ReusedThreadIdentityMutexTest) {
+ // This test repeatly creates and joins a series of threads, each of
+ // which acquires and releases shared Mutex locks. This verifies
+ // Mutex operations work correctly under a reused
+ // ThreadIdentity. Note that the most likely failure mode of this
+ // test is a crash or deadlock.
+ static const int kNumLoops = 10;
+ static const int kNumThreads = 12;
+ static const int kNumMutexes = 3;
+ static const int kNumLockLoops = 5;
+
+ Mutex mutexes[kNumMutexes];
+ for (int iter = 0; iter < kNumLoops; ++iter) {
+ std::vector<std::thread> threads;
+ for (int thread = 0; thread < kNumThreads; ++thread) {
+ threads.push_back(std::thread([&]() {
+ for (int l = 0; l < kNumLockLoops; ++l) {
+ for (int m = 0; m < kNumMutexes; ++m) {
+ MutexLock lock(&mutexes[m]);
+ }
+ }
+ }));
+ }
+ for (auto& thread : threads) {
+ thread.join();
+ }
+ }
+}
+
+} // namespace
+} // namespace base_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/base/internal/throw_delegate.cc b/third_party/abseil/src/absl/base/internal/throw_delegate.cc
new file mode 100644
index 0000000..c260ff1
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/throw_delegate.cc
@@ -0,0 +1,212 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/base/internal/throw_delegate.h"
+
+#include <cstdlib>
+#include <functional>
+#include <new>
+#include <stdexcept>
+
+#include "absl/base/config.h"
+#include "absl/base/internal/raw_logging.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace base_internal {
+
+// NOTE: The various STL exception throwing functions are placed within the
+// #ifdef blocks so the symbols aren't exposed on platforms that don't support
+// them, such as the Android NDK. For example, ANGLE fails to link when building
+// within AOSP without them, since the STL functions don't exist.
+namespace {
+#ifdef ABSL_HAVE_EXCEPTIONS
+template <typename T>
+[[noreturn]] void Throw(const T& error) {
+ throw error;
+}
+#endif
+} // namespace
+
+void ThrowStdLogicError(const std::string& what_arg) {
+#ifdef ABSL_HAVE_EXCEPTIONS
+ Throw(std::logic_error(what_arg));
+#else
+ ABSL_RAW_LOG(FATAL, "%s", what_arg.c_str());
+ std::abort();
+#endif
+}
+void ThrowStdLogicError(const char* what_arg) {
+#ifdef ABSL_HAVE_EXCEPTIONS
+ Throw(std::logic_error(what_arg));
+#else
+ ABSL_RAW_LOG(FATAL, "%s", what_arg);
+ std::abort();
+#endif
+}
+void ThrowStdInvalidArgument(const std::string& what_arg) {
+#ifdef ABSL_HAVE_EXCEPTIONS
+ Throw(std::invalid_argument(what_arg));
+#else
+ ABSL_RAW_LOG(FATAL, "%s", what_arg.c_str());
+ std::abort();
+#endif
+}
+void ThrowStdInvalidArgument(const char* what_arg) {
+#ifdef ABSL_HAVE_EXCEPTIONS
+ Throw(std::invalid_argument(what_arg));
+#else
+ ABSL_RAW_LOG(FATAL, "%s", what_arg);
+ std::abort();
+#endif
+}
+
+void ThrowStdDomainError(const std::string& what_arg) {
+#ifdef ABSL_HAVE_EXCEPTIONS
+ Throw(std::domain_error(what_arg));
+#else
+ ABSL_RAW_LOG(FATAL, "%s", what_arg.c_str());
+ std::abort();
+#endif
+}
+void ThrowStdDomainError(const char* what_arg) {
+#ifdef ABSL_HAVE_EXCEPTIONS
+ Throw(std::domain_error(what_arg));
+#else
+ ABSL_RAW_LOG(FATAL, "%s", what_arg);
+ std::abort();
+#endif
+}
+
+void ThrowStdLengthError(const std::string& what_arg) {
+#ifdef ABSL_HAVE_EXCEPTIONS
+ Throw(std::length_error(what_arg));
+#else
+ ABSL_RAW_LOG(FATAL, "%s", what_arg.c_str());
+ std::abort();
+#endif
+}
+void ThrowStdLengthError(const char* what_arg) {
+#ifdef ABSL_HAVE_EXCEPTIONS
+ Throw(std::length_error(what_arg));
+#else
+ ABSL_RAW_LOG(FATAL, "%s", what_arg);
+ std::abort();
+#endif
+}
+
+void ThrowStdOutOfRange(const std::string& what_arg) {
+#ifdef ABSL_HAVE_EXCEPTIONS
+ Throw(std::out_of_range(what_arg));
+#else
+ ABSL_RAW_LOG(FATAL, "%s", what_arg.c_str());
+ std::abort();
+#endif
+}
+void ThrowStdOutOfRange(const char* what_arg) {
+#ifdef ABSL_HAVE_EXCEPTIONS
+ Throw(std::out_of_range(what_arg));
+#else
+ ABSL_RAW_LOG(FATAL, "%s", what_arg);
+ std::abort();
+#endif
+}
+
+void ThrowStdRuntimeError(const std::string& what_arg) {
+#ifdef ABSL_HAVE_EXCEPTIONS
+ Throw(std::runtime_error(what_arg));
+#else
+ ABSL_RAW_LOG(FATAL, "%s", what_arg.c_str());
+ std::abort();
+#endif
+}
+void ThrowStdRuntimeError(const char* what_arg) {
+#ifdef ABSL_HAVE_EXCEPTIONS
+ Throw(std::runtime_error(what_arg));
+#else
+ ABSL_RAW_LOG(FATAL, "%s", what_arg);
+ std::abort();
+#endif
+}
+
+void ThrowStdRangeError(const std::string& what_arg) {
+#ifdef ABSL_HAVE_EXCEPTIONS
+ Throw(std::range_error(what_arg));
+#else
+ ABSL_RAW_LOG(FATAL, "%s", what_arg.c_str());
+ std::abort();
+#endif
+}
+void ThrowStdRangeError(const char* what_arg) {
+#ifdef ABSL_HAVE_EXCEPTIONS
+ Throw(std::range_error(what_arg));
+#else
+ ABSL_RAW_LOG(FATAL, "%s", what_arg);
+ std::abort();
+#endif
+}
+
+void ThrowStdOverflowError(const std::string& what_arg) {
+#ifdef ABSL_HAVE_EXCEPTIONS
+ Throw(std::overflow_error(what_arg));
+#else
+ ABSL_RAW_LOG(FATAL, "%s", what_arg.c_str());
+ std::abort();
+#endif
+}
+void ThrowStdOverflowError(const char* what_arg) {
+#ifdef ABSL_HAVE_EXCEPTIONS
+ Throw(std::overflow_error(what_arg));
+#else
+ ABSL_RAW_LOG(FATAL, "%s", what_arg);
+ std::abort();
+#endif
+}
+
+void ThrowStdUnderflowError(const std::string& what_arg) {
+#ifdef ABSL_HAVE_EXCEPTIONS
+ Throw(std::underflow_error(what_arg));
+#else
+ ABSL_RAW_LOG(FATAL, "%s", what_arg.c_str());
+ std::abort();
+#endif
+}
+void ThrowStdUnderflowError(const char* what_arg) {
+#ifdef ABSL_HAVE_EXCEPTIONS
+ Throw(std::underflow_error(what_arg));
+#else
+ ABSL_RAW_LOG(FATAL, "%s", what_arg);
+ std::abort();
+#endif
+}
+
+void ThrowStdBadFunctionCall() {
+#ifdef ABSL_HAVE_EXCEPTIONS
+ Throw(std::bad_function_call());
+#else
+ std::abort();
+#endif
+}
+
+void ThrowStdBadAlloc() {
+#ifdef ABSL_HAVE_EXCEPTIONS
+ Throw(std::bad_alloc());
+#else
+ std::abort();
+#endif
+}
+
+} // namespace base_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/base/internal/throw_delegate.h b/third_party/abseil/src/absl/base/internal/throw_delegate.h
new file mode 100644
index 0000000..075f527
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/throw_delegate.h
@@ -0,0 +1,75 @@
+//
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+#ifndef ABSL_BASE_INTERNAL_THROW_DELEGATE_H_
+#define ABSL_BASE_INTERNAL_THROW_DELEGATE_H_
+
+#include <string>
+
+#include "absl/base/config.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace base_internal {
+
+// Helper functions that allow throwing exceptions consistently from anywhere.
+// The main use case is for header-based libraries (eg templates), as they will
+// be built by many different targets with their own compiler options.
+// In particular, this will allow a safe way to throw exceptions even if the
+// caller is compiled with -fno-exceptions. This is intended for implementing
+// things like map<>::at(), which the standard documents as throwing an
+// exception on error.
+//
+// Using other techniques like #if tricks could lead to ODR violations.
+//
+// You shouldn't use it unless you're writing code that you know will be built
+// both with and without exceptions and you need to conform to an interface
+// that uses exceptions.
+
+[[noreturn]] void ThrowStdLogicError(const std::string& what_arg);
+[[noreturn]] void ThrowStdLogicError(const char* what_arg);
+[[noreturn]] void ThrowStdInvalidArgument(const std::string& what_arg);
+[[noreturn]] void ThrowStdInvalidArgument(const char* what_arg);
+[[noreturn]] void ThrowStdDomainError(const std::string& what_arg);
+[[noreturn]] void ThrowStdDomainError(const char* what_arg);
+[[noreturn]] void ThrowStdLengthError(const std::string& what_arg);
+[[noreturn]] void ThrowStdLengthError(const char* what_arg);
+[[noreturn]] void ThrowStdOutOfRange(const std::string& what_arg);
+[[noreturn]] void ThrowStdOutOfRange(const char* what_arg);
+[[noreturn]] void ThrowStdRuntimeError(const std::string& what_arg);
+[[noreturn]] void ThrowStdRuntimeError(const char* what_arg);
+[[noreturn]] void ThrowStdRangeError(const std::string& what_arg);
+[[noreturn]] void ThrowStdRangeError(const char* what_arg);
+[[noreturn]] void ThrowStdOverflowError(const std::string& what_arg);
+[[noreturn]] void ThrowStdOverflowError(const char* what_arg);
+[[noreturn]] void ThrowStdUnderflowError(const std::string& what_arg);
+[[noreturn]] void ThrowStdUnderflowError(const char* what_arg);
+
+[[noreturn]] void ThrowStdBadFunctionCall();
+[[noreturn]] void ThrowStdBadAlloc();
+
+// ThrowStdBadArrayNewLength() cannot be consistently supported because
+// std::bad_array_new_length is missing in libstdc++ until 4.9.0.
+// https://gcc.gnu.org/onlinedocs/gcc-4.8.3/libstdc++/api/a01379_source.html
+// https://gcc.gnu.org/onlinedocs/gcc-4.9.0/libstdc++/api/a01327_source.html
+// libcxx (as of 3.2) and msvc (as of 2015) both have it.
+// [[noreturn]] void ThrowStdBadArrayNewLength();
+
+} // namespace base_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_BASE_INTERNAL_THROW_DELEGATE_H_
diff --git a/third_party/abseil/src/absl/base/internal/tsan_mutex_interface.h b/third_party/abseil/src/absl/base/internal/tsan_mutex_interface.h
new file mode 100644
index 0000000..39207d8
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/tsan_mutex_interface.h
@@ -0,0 +1,68 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// This file is intended solely for spinlock.h.
+// It provides ThreadSanitizer annotations for custom mutexes.
+// See <sanitizer/tsan_interface.h> for meaning of these annotations.
+
+#ifndef ABSL_BASE_INTERNAL_TSAN_MUTEX_INTERFACE_H_
+#define ABSL_BASE_INTERNAL_TSAN_MUTEX_INTERFACE_H_
+
+#include "absl/base/config.h"
+
+// ABSL_INTERNAL_HAVE_TSAN_INTERFACE
+// Macro intended only for internal use.
+//
+// Checks whether LLVM Thread Sanitizer interfaces are available.
+// First made available in LLVM 5.0 (Sep 2017).
+#ifdef ABSL_INTERNAL_HAVE_TSAN_INTERFACE
+#error "ABSL_INTERNAL_HAVE_TSAN_INTERFACE cannot be directly set."
+#endif
+
+#if defined(ABSL_HAVE_THREAD_SANITIZER) && defined(__has_include)
+#if __has_include(<sanitizer/tsan_interface.h>)
+#define ABSL_INTERNAL_HAVE_TSAN_INTERFACE 1
+#endif
+#endif
+
+#ifdef ABSL_INTERNAL_HAVE_TSAN_INTERFACE
+#include <sanitizer/tsan_interface.h>
+
+#define ABSL_TSAN_MUTEX_CREATE __tsan_mutex_create
+#define ABSL_TSAN_MUTEX_DESTROY __tsan_mutex_destroy
+#define ABSL_TSAN_MUTEX_PRE_LOCK __tsan_mutex_pre_lock
+#define ABSL_TSAN_MUTEX_POST_LOCK __tsan_mutex_post_lock
+#define ABSL_TSAN_MUTEX_PRE_UNLOCK __tsan_mutex_pre_unlock
+#define ABSL_TSAN_MUTEX_POST_UNLOCK __tsan_mutex_post_unlock
+#define ABSL_TSAN_MUTEX_PRE_SIGNAL __tsan_mutex_pre_signal
+#define ABSL_TSAN_MUTEX_POST_SIGNAL __tsan_mutex_post_signal
+#define ABSL_TSAN_MUTEX_PRE_DIVERT __tsan_mutex_pre_divert
+#define ABSL_TSAN_MUTEX_POST_DIVERT __tsan_mutex_post_divert
+
+#else
+
+#define ABSL_TSAN_MUTEX_CREATE(...)
+#define ABSL_TSAN_MUTEX_DESTROY(...)
+#define ABSL_TSAN_MUTEX_PRE_LOCK(...)
+#define ABSL_TSAN_MUTEX_POST_LOCK(...)
+#define ABSL_TSAN_MUTEX_PRE_UNLOCK(...)
+#define ABSL_TSAN_MUTEX_POST_UNLOCK(...)
+#define ABSL_TSAN_MUTEX_PRE_SIGNAL(...)
+#define ABSL_TSAN_MUTEX_POST_SIGNAL(...)
+#define ABSL_TSAN_MUTEX_PRE_DIVERT(...)
+#define ABSL_TSAN_MUTEX_POST_DIVERT(...)
+
+#endif
+
+#endif // ABSL_BASE_INTERNAL_TSAN_MUTEX_INTERFACE_H_
diff --git a/third_party/abseil/src/absl/base/internal/unaligned_access.h b/third_party/abseil/src/absl/base/internal/unaligned_access.h
new file mode 100644
index 0000000..093dd9b
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/unaligned_access.h
@@ -0,0 +1,82 @@
+//
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+#ifndef ABSL_BASE_INTERNAL_UNALIGNED_ACCESS_H_
+#define ABSL_BASE_INTERNAL_UNALIGNED_ACCESS_H_
+
+#include <string.h>
+
+#include <cstdint>
+
+#include "absl/base/attributes.h"
+#include "absl/base/config.h"
+
+// unaligned APIs
+
+// Portable handling of unaligned loads, stores, and copies.
+
+// The unaligned API is C++ only. The declarations use C++ features
+// (namespaces, inline) which are absent or incompatible in C.
+#if defined(__cplusplus)
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace base_internal {
+
+inline uint16_t UnalignedLoad16(const void *p) {
+ uint16_t t;
+ memcpy(&t, p, sizeof t);
+ return t;
+}
+
+inline uint32_t UnalignedLoad32(const void *p) {
+ uint32_t t;
+ memcpy(&t, p, sizeof t);
+ return t;
+}
+
+inline uint64_t UnalignedLoad64(const void *p) {
+ uint64_t t;
+ memcpy(&t, p, sizeof t);
+ return t;
+}
+
+inline void UnalignedStore16(void *p, uint16_t v) { memcpy(p, &v, sizeof v); }
+
+inline void UnalignedStore32(void *p, uint32_t v) { memcpy(p, &v, sizeof v); }
+
+inline void UnalignedStore64(void *p, uint64_t v) { memcpy(p, &v, sizeof v); }
+
+} // namespace base_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#define ABSL_INTERNAL_UNALIGNED_LOAD16(_p) \
+ (absl::base_internal::UnalignedLoad16(_p))
+#define ABSL_INTERNAL_UNALIGNED_LOAD32(_p) \
+ (absl::base_internal::UnalignedLoad32(_p))
+#define ABSL_INTERNAL_UNALIGNED_LOAD64(_p) \
+ (absl::base_internal::UnalignedLoad64(_p))
+
+#define ABSL_INTERNAL_UNALIGNED_STORE16(_p, _val) \
+ (absl::base_internal::UnalignedStore16(_p, _val))
+#define ABSL_INTERNAL_UNALIGNED_STORE32(_p, _val) \
+ (absl::base_internal::UnalignedStore32(_p, _val))
+#define ABSL_INTERNAL_UNALIGNED_STORE64(_p, _val) \
+ (absl::base_internal::UnalignedStore64(_p, _val))
+
+#endif // defined(__cplusplus), end of unaligned API
+
+#endif // ABSL_BASE_INTERNAL_UNALIGNED_ACCESS_H_
diff --git a/third_party/abseil/src/absl/base/internal/unique_small_name_test.cc b/third_party/abseil/src/absl/base/internal/unique_small_name_test.cc
new file mode 100644
index 0000000..ff8c2b3
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/unique_small_name_test.cc
@@ -0,0 +1,77 @@
+// Copyright 2020 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "gtest/gtest.h"
+#include "absl/base/optimization.h"
+#include "absl/strings/string_view.h"
+
+// This test by itself does not do anything fancy, but it serves as binary I can
+// query in shell test.
+
+namespace {
+
+template <class T>
+void DoNotOptimize(const T& var) {
+#ifdef __GNUC__
+ asm volatile("" : "+m"(const_cast<T&>(var)));
+#else
+ std::cout << (void*)&var;
+#endif
+}
+
+int very_long_int_variable_name ABSL_INTERNAL_UNIQUE_SMALL_NAME() = 0;
+char very_long_str_variable_name[] ABSL_INTERNAL_UNIQUE_SMALL_NAME() = "abc";
+
+TEST(UniqueSmallName, NonAutomaticVar) {
+ EXPECT_EQ(very_long_int_variable_name, 0);
+ EXPECT_EQ(absl::string_view(very_long_str_variable_name), "abc");
+}
+
+int VeryLongFreeFunctionName() ABSL_INTERNAL_UNIQUE_SMALL_NAME();
+
+TEST(UniqueSmallName, FreeFunction) {
+ DoNotOptimize(&VeryLongFreeFunctionName);
+
+ EXPECT_EQ(VeryLongFreeFunctionName(), 456);
+}
+
+int VeryLongFreeFunctionName() { return 456; }
+
+struct VeryLongStructName {
+ explicit VeryLongStructName(int i);
+
+ int VeryLongMethodName() ABSL_INTERNAL_UNIQUE_SMALL_NAME();
+
+ static int VeryLongStaticMethodName() ABSL_INTERNAL_UNIQUE_SMALL_NAME();
+
+ private:
+ int fld;
+};
+
+TEST(UniqueSmallName, Struct) {
+ VeryLongStructName var(10);
+
+ DoNotOptimize(var);
+ DoNotOptimize(&VeryLongStructName::VeryLongMethodName);
+ DoNotOptimize(&VeryLongStructName::VeryLongStaticMethodName);
+
+ EXPECT_EQ(var.VeryLongMethodName(), 10);
+ EXPECT_EQ(VeryLongStructName::VeryLongStaticMethodName(), 123);
+}
+
+VeryLongStructName::VeryLongStructName(int i) : fld(i) {}
+int VeryLongStructName::VeryLongMethodName() { return fld; }
+int VeryLongStructName::VeryLongStaticMethodName() { return 123; }
+
+} // namespace
diff --git a/third_party/abseil/src/absl/base/internal/unscaledcycleclock.cc b/third_party/abseil/src/absl/base/internal/unscaledcycleclock.cc
new file mode 100644
index 0000000..1545288
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/unscaledcycleclock.cc
@@ -0,0 +1,138 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/base/internal/unscaledcycleclock.h"
+
+#if ABSL_USE_UNSCALED_CYCLECLOCK
+
+#if defined(_WIN32)
+#include <intrin.h>
+#endif
+
+#if defined(__powerpc__) || defined(__ppc__)
+#ifdef __GLIBC__
+#include <sys/platform/ppc.h>
+#elif defined(__FreeBSD__)
+#include <sys/sysctl.h>
+#include <sys/types.h>
+#endif
+#endif
+
+#include "absl/base/internal/sysinfo.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace base_internal {
+
+#if defined(__i386__)
+
+int64_t UnscaledCycleClock::Now() {
+ int64_t ret;
+ __asm__ volatile("rdtsc" : "=A"(ret));
+ return ret;
+}
+
+double UnscaledCycleClock::Frequency() {
+ return base_internal::NominalCPUFrequency();
+}
+
+#elif defined(__x86_64__)
+
+int64_t UnscaledCycleClock::Now() {
+ uint64_t low, high;
+ __asm__ volatile("rdtsc" : "=a"(low), "=d"(high));
+ return (high << 32) | low;
+}
+
+double UnscaledCycleClock::Frequency() {
+ return base_internal::NominalCPUFrequency();
+}
+
+#elif defined(__powerpc__) || defined(__ppc__)
+
+int64_t UnscaledCycleClock::Now() {
+#ifdef __GLIBC__
+ return __ppc_get_timebase();
+#else
+#ifdef __powerpc64__
+ int64_t tbr;
+ asm volatile("mfspr %0, 268" : "=r"(tbr));
+ return tbr;
+#else
+ int32_t tbu, tbl, tmp;
+ asm volatile(
+ "0:\n"
+ "mftbu %[hi32]\n"
+ "mftb %[lo32]\n"
+ "mftbu %[tmp]\n"
+ "cmpw %[tmp],%[hi32]\n"
+ "bne 0b\n"
+ : [ hi32 ] "=r"(tbu), [ lo32 ] "=r"(tbl), [ tmp ] "=r"(tmp));
+ return (static_cast<int64_t>(tbu) << 32) | tbl;
+#endif
+#endif
+}
+
+double UnscaledCycleClock::Frequency() {
+#ifdef __GLIBC__
+ return __ppc_get_timebase_freq();
+#elif defined(__FreeBSD__)
+ static once_flag init_timebase_frequency_once;
+ static double timebase_frequency = 0.0;
+ base_internal::LowLevelCallOnce(&init_timebase_frequency_once, [&]() {
+ size_t length = sizeof(timebase_frequency);
+ sysctlbyname("kern.timecounter.tc.timebase.frequency", &timebase_frequency,
+ &length, nullptr, 0);
+ });
+ return timebase_frequency;
+#else
+#error Must implement UnscaledCycleClock::Frequency()
+#endif
+}
+
+#elif defined(__aarch64__)
+
+// System timer of ARMv8 runs at a different frequency than the CPU's.
+// The frequency is fixed, typically in the range 1-50MHz. It can be
+// read at CNTFRQ special register. We assume the OS has set up
+// the virtual timer properly.
+int64_t UnscaledCycleClock::Now() {
+ int64_t virtual_timer_value;
+ asm volatile("mrs %0, cntvct_el0" : "=r"(virtual_timer_value));
+ return virtual_timer_value;
+}
+
+double UnscaledCycleClock::Frequency() {
+ uint64_t aarch64_timer_frequency;
+ asm volatile("mrs %0, cntfrq_el0" : "=r"(aarch64_timer_frequency));
+ return aarch64_timer_frequency;
+}
+
+#elif defined(_M_IX86) || defined(_M_X64)
+
+#pragma intrinsic(__rdtsc)
+
+int64_t UnscaledCycleClock::Now() { return __rdtsc(); }
+
+double UnscaledCycleClock::Frequency() {
+ return base_internal::NominalCPUFrequency();
+}
+
+#endif
+
+} // namespace base_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_USE_UNSCALED_CYCLECLOCK
diff --git a/third_party/abseil/src/absl/base/internal/unscaledcycleclock.h b/third_party/abseil/src/absl/base/internal/unscaledcycleclock.h
new file mode 100644
index 0000000..82f2c87
--- /dev/null
+++ b/third_party/abseil/src/absl/base/internal/unscaledcycleclock.h
@@ -0,0 +1,124 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// UnscaledCycleClock
+// An UnscaledCycleClock yields the value and frequency of a cycle counter
+// that increments at a rate that is approximately constant.
+// This class is for internal use only, you should consider using CycleClock
+// instead.
+//
+// Notes:
+// The cycle counter frequency is not necessarily the core clock frequency.
+// That is, CycleCounter cycles are not necessarily "CPU cycles".
+//
+// An arbitrary offset may have been added to the counter at power on.
+//
+// On some platforms, the rate and offset of the counter may differ
+// slightly when read from different CPUs of a multiprocessor. Usually,
+// we try to ensure that the operating system adjusts values periodically
+// so that values agree approximately. If you need stronger guarantees,
+// consider using alternate interfaces.
+//
+// The CPU is not required to maintain the ordering of a cycle counter read
+// with respect to surrounding instructions.
+
+#ifndef ABSL_BASE_INTERNAL_UNSCALEDCYCLECLOCK_H_
+#define ABSL_BASE_INTERNAL_UNSCALEDCYCLECLOCK_H_
+
+#include <cstdint>
+
+#if defined(__APPLE__)
+#include <TargetConditionals.h>
+#endif
+
+#include "absl/base/port.h"
+
+// The following platforms have an implementation of a hardware counter.
+#if defined(__i386__) || defined(__x86_64__) || defined(__aarch64__) || \
+ defined(__powerpc__) || defined(__ppc__) || \
+ defined(_M_IX86) || defined(_M_X64)
+#define ABSL_HAVE_UNSCALED_CYCLECLOCK_IMPLEMENTATION 1
+#else
+#define ABSL_HAVE_UNSCALED_CYCLECLOCK_IMPLEMENTATION 0
+#endif
+
+// The following platforms often disable access to the hardware
+// counter (through a sandbox) even if the underlying hardware has a
+// usable counter. The CycleTimer interface also requires a *scaled*
+// CycleClock that runs at atleast 1 MHz. We've found some Android
+// ARM64 devices where this is not the case, so we disable it by
+// default on Android ARM64.
+#if defined(__native_client__) || \
+ (defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE) || \
+ (defined(__ANDROID__) && defined(__aarch64__))
+#define ABSL_USE_UNSCALED_CYCLECLOCK_DEFAULT 0
+#else
+#define ABSL_USE_UNSCALED_CYCLECLOCK_DEFAULT 1
+#endif
+
+// UnscaledCycleClock is an optional internal feature.
+// Use "#if ABSL_USE_UNSCALED_CYCLECLOCK" to test for its presence.
+// Can be overridden at compile-time via -DABSL_USE_UNSCALED_CYCLECLOCK=0|1
+#if !defined(ABSL_USE_UNSCALED_CYCLECLOCK)
+#define ABSL_USE_UNSCALED_CYCLECLOCK \
+ (ABSL_HAVE_UNSCALED_CYCLECLOCK_IMPLEMENTATION && \
+ ABSL_USE_UNSCALED_CYCLECLOCK_DEFAULT)
+#endif
+
+#if ABSL_USE_UNSCALED_CYCLECLOCK
+
+// This macro can be used to test if UnscaledCycleClock::Frequency()
+// is NominalCPUFrequency() on a particular platform.
+#if (defined(__i386__) || defined(__x86_64__) || \
+ defined(_M_IX86) || defined(_M_X64))
+#define ABSL_INTERNAL_UNSCALED_CYCLECLOCK_FREQUENCY_IS_CPU_FREQUENCY
+#endif
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace time_internal {
+class UnscaledCycleClockWrapperForGetCurrentTime;
+} // namespace time_internal
+
+namespace base_internal {
+class CycleClock;
+class UnscaledCycleClockWrapperForInitializeFrequency;
+
+class UnscaledCycleClock {
+ private:
+ UnscaledCycleClock() = delete;
+
+ // Return the value of a cycle counter that counts at a rate that is
+ // approximately constant.
+ static int64_t Now();
+
+ // Return the how much UnscaledCycleClock::Now() increases per second.
+ // This is not necessarily the core CPU clock frequency.
+ // It may be the nominal value report by the kernel, rather than a measured
+ // value.
+ static double Frequency();
+
+ // Allowed users
+ friend class base_internal::CycleClock;
+ friend class time_internal::UnscaledCycleClockWrapperForGetCurrentTime;
+ friend class base_internal::UnscaledCycleClockWrapperForInitializeFrequency;
+};
+
+} // namespace base_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_USE_UNSCALED_CYCLECLOCK
+
+#endif // ABSL_BASE_INTERNAL_UNSCALEDCYCLECLOCK_H_
diff --git a/third_party/abseil/src/absl/base/invoke_test.cc b/third_party/abseil/src/absl/base/invoke_test.cc
new file mode 100644
index 0000000..bcdef36
--- /dev/null
+++ b/third_party/abseil/src/absl/base/invoke_test.cc
@@ -0,0 +1,229 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/base/internal/invoke.h"
+
+#include <functional>
+#include <memory>
+#include <string>
+#include <utility>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/memory/memory.h"
+#include "absl/strings/str_cat.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace base_internal {
+namespace {
+
+int Function(int a, int b) { return a - b; }
+
+int Sink(std::unique_ptr<int> p) {
+ return *p;
+}
+
+std::unique_ptr<int> Factory(int n) {
+ return make_unique<int>(n);
+}
+
+void NoOp() {}
+
+struct ConstFunctor {
+ int operator()(int a, int b) const { return a - b; }
+};
+
+struct MutableFunctor {
+ int operator()(int a, int b) { return a - b; }
+};
+
+struct EphemeralFunctor {
+ int operator()(int a, int b) && { return a - b; }
+};
+
+struct OverloadedFunctor {
+ template <typename... Args>
+ std::string operator()(const Args&... args) & {
+ return StrCat("&", args...);
+ }
+ template <typename... Args>
+ std::string operator()(const Args&... args) const& {
+ return StrCat("const&", args...);
+ }
+ template <typename... Args>
+ std::string operator()(const Args&... args) && {
+ return StrCat("&&", args...);
+ }
+};
+
+struct Class {
+ int Method(int a, int b) { return a - b; }
+ int ConstMethod(int a, int b) const { return a - b; }
+ int RefMethod(int a, int b) & { return a - b; }
+ int RefRefMethod(int a, int b) && { return a - b; }
+ int NoExceptMethod(int a, int b) noexcept { return a - b; }
+ int VolatileMethod(int a, int b) volatile { return a - b; }
+
+ int member;
+};
+
+struct FlipFlop {
+ int ConstMethod() const { return member; }
+ FlipFlop operator*() const { return {-member}; }
+
+ int member;
+};
+
+// CallMaybeWithArg(f) resolves either to invoke(f) or invoke(f, 42), depending
+// on which one is valid.
+template <typename F>
+decltype(base_internal::invoke(std::declval<const F&>())) CallMaybeWithArg(
+ const F& f) {
+ return base_internal::invoke(f);
+}
+
+template <typename F>
+decltype(base_internal::invoke(std::declval<const F&>(), 42)) CallMaybeWithArg(
+ const F& f) {
+ return base_internal::invoke(f, 42);
+}
+
+TEST(InvokeTest, Function) {
+ EXPECT_EQ(1, base_internal::invoke(Function, 3, 2));
+ EXPECT_EQ(1, base_internal::invoke(&Function, 3, 2));
+}
+
+TEST(InvokeTest, NonCopyableArgument) {
+ EXPECT_EQ(42, base_internal::invoke(Sink, make_unique<int>(42)));
+}
+
+TEST(InvokeTest, NonCopyableResult) {
+ EXPECT_THAT(base_internal::invoke(Factory, 42), ::testing::Pointee(42));
+}
+
+TEST(InvokeTest, VoidResult) { base_internal::invoke(NoOp); }
+
+TEST(InvokeTest, ConstFunctor) {
+ EXPECT_EQ(1, base_internal::invoke(ConstFunctor(), 3, 2));
+}
+
+TEST(InvokeTest, MutableFunctor) {
+ MutableFunctor f;
+ EXPECT_EQ(1, base_internal::invoke(f, 3, 2));
+ EXPECT_EQ(1, base_internal::invoke(MutableFunctor(), 3, 2));
+}
+
+TEST(InvokeTest, EphemeralFunctor) {
+ EphemeralFunctor f;
+ EXPECT_EQ(1, base_internal::invoke(std::move(f), 3, 2));
+ EXPECT_EQ(1, base_internal::invoke(EphemeralFunctor(), 3, 2));
+}
+
+TEST(InvokeTest, OverloadedFunctor) {
+ OverloadedFunctor f;
+ const OverloadedFunctor& cf = f;
+
+ EXPECT_EQ("&", base_internal::invoke(f));
+ EXPECT_EQ("& 42", base_internal::invoke(f, " 42"));
+
+ EXPECT_EQ("const&", base_internal::invoke(cf));
+ EXPECT_EQ("const& 42", base_internal::invoke(cf, " 42"));
+
+ EXPECT_EQ("&&", base_internal::invoke(std::move(f)));
+
+ OverloadedFunctor f2;
+ EXPECT_EQ("&& 42", base_internal::invoke(std::move(f2), " 42"));
+}
+
+TEST(InvokeTest, ReferenceWrapper) {
+ ConstFunctor cf;
+ MutableFunctor mf;
+ EXPECT_EQ(1, base_internal::invoke(std::cref(cf), 3, 2));
+ EXPECT_EQ(1, base_internal::invoke(std::ref(cf), 3, 2));
+ EXPECT_EQ(1, base_internal::invoke(std::ref(mf), 3, 2));
+}
+
+TEST(InvokeTest, MemberFunction) {
+ std::unique_ptr<Class> p(new Class);
+ std::unique_ptr<const Class> cp(new Class);
+ std::unique_ptr<volatile Class> vp(new Class);
+
+ EXPECT_EQ(1, base_internal::invoke(&Class::Method, p, 3, 2));
+ EXPECT_EQ(1, base_internal::invoke(&Class::Method, p.get(), 3, 2));
+ EXPECT_EQ(1, base_internal::invoke(&Class::Method, *p, 3, 2));
+ EXPECT_EQ(1, base_internal::invoke(&Class::RefMethod, p, 3, 2));
+ EXPECT_EQ(1, base_internal::invoke(&Class::RefMethod, p.get(), 3, 2));
+ EXPECT_EQ(1, base_internal::invoke(&Class::RefMethod, *p, 3, 2));
+ EXPECT_EQ(1, base_internal::invoke(&Class::RefRefMethod, std::move(*p), 3,
+ 2)); // NOLINT
+ EXPECT_EQ(1, base_internal::invoke(&Class::NoExceptMethod, p, 3, 2));
+ EXPECT_EQ(1, base_internal::invoke(&Class::NoExceptMethod, p.get(), 3, 2));
+ EXPECT_EQ(1, base_internal::invoke(&Class::NoExceptMethod, *p, 3, 2));
+
+ EXPECT_EQ(1, base_internal::invoke(&Class::ConstMethod, p, 3, 2));
+ EXPECT_EQ(1, base_internal::invoke(&Class::ConstMethod, p.get(), 3, 2));
+ EXPECT_EQ(1, base_internal::invoke(&Class::ConstMethod, *p, 3, 2));
+
+ EXPECT_EQ(1, base_internal::invoke(&Class::ConstMethod, cp, 3, 2));
+ EXPECT_EQ(1, base_internal::invoke(&Class::ConstMethod, cp.get(), 3, 2));
+ EXPECT_EQ(1, base_internal::invoke(&Class::ConstMethod, *cp, 3, 2));
+
+ EXPECT_EQ(1, base_internal::invoke(&Class::VolatileMethod, p, 3, 2));
+ EXPECT_EQ(1, base_internal::invoke(&Class::VolatileMethod, p.get(), 3, 2));
+ EXPECT_EQ(1, base_internal::invoke(&Class::VolatileMethod, *p, 3, 2));
+ EXPECT_EQ(1, base_internal::invoke(&Class::VolatileMethod, vp, 3, 2));
+ EXPECT_EQ(1, base_internal::invoke(&Class::VolatileMethod, vp.get(), 3, 2));
+ EXPECT_EQ(1, base_internal::invoke(&Class::VolatileMethod, *vp, 3, 2));
+
+ EXPECT_EQ(1,
+ base_internal::invoke(&Class::Method, make_unique<Class>(), 3, 2));
+ EXPECT_EQ(1, base_internal::invoke(&Class::ConstMethod, make_unique<Class>(),
+ 3, 2));
+ EXPECT_EQ(1, base_internal::invoke(&Class::ConstMethod,
+ make_unique<const Class>(), 3, 2));
+}
+
+TEST(InvokeTest, DataMember) {
+ std::unique_ptr<Class> p(new Class{42});
+ std::unique_ptr<const Class> cp(new Class{42});
+ EXPECT_EQ(42, base_internal::invoke(&Class::member, p));
+ EXPECT_EQ(42, base_internal::invoke(&Class::member, *p));
+ EXPECT_EQ(42, base_internal::invoke(&Class::member, p.get()));
+
+ base_internal::invoke(&Class::member, p) = 42;
+ base_internal::invoke(&Class::member, p.get()) = 42;
+
+ EXPECT_EQ(42, base_internal::invoke(&Class::member, cp));
+ EXPECT_EQ(42, base_internal::invoke(&Class::member, *cp));
+ EXPECT_EQ(42, base_internal::invoke(&Class::member, cp.get()));
+}
+
+TEST(InvokeTest, FlipFlop) {
+ FlipFlop obj = {42};
+ // This call could resolve to (obj.*&FlipFlop::ConstMethod)() or
+ // ((*obj).*&FlipFlop::ConstMethod)(). We verify that it's the former.
+ EXPECT_EQ(42, base_internal::invoke(&FlipFlop::ConstMethod, obj));
+ EXPECT_EQ(42, base_internal::invoke(&FlipFlop::member, obj));
+}
+
+TEST(InvokeTest, SfinaeFriendly) {
+ CallMaybeWithArg(NoOp);
+ EXPECT_THAT(CallMaybeWithArg(Factory), ::testing::Pointee(42));
+}
+
+} // namespace
+} // namespace base_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/base/log_severity.cc b/third_party/abseil/src/absl/base/log_severity.cc
new file mode 100644
index 0000000..72312af
--- /dev/null
+++ b/third_party/abseil/src/absl/base/log_severity.cc
@@ -0,0 +1,27 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/base/log_severity.h"
+
+#include <ostream>
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+std::ostream& operator<<(std::ostream& os, absl::LogSeverity s) {
+ if (s == absl::NormalizeLogSeverity(s)) return os << absl::LogSeverityName(s);
+ return os << "absl::LogSeverity(" << static_cast<int>(s) << ")";
+}
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/base/log_severity.h b/third_party/abseil/src/absl/base/log_severity.h
new file mode 100644
index 0000000..045f17f
--- /dev/null
+++ b/third_party/abseil/src/absl/base/log_severity.h
@@ -0,0 +1,121 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_BASE_LOG_SEVERITY_H_
+#define ABSL_BASE_LOG_SEVERITY_H_
+
+#include <array>
+#include <ostream>
+
+#include "absl/base/attributes.h"
+#include "absl/base/config.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+// absl::LogSeverity
+//
+// Four severity levels are defined. Logging APIs should terminate the program
+// when a message is logged at severity `kFatal`; the other levels have no
+// special semantics.
+//
+// Values other than the four defined levels (e.g. produced by `static_cast`)
+// are valid, but their semantics when passed to a function, macro, or flag
+// depend on the function, macro, or flag. The usual behavior is to normalize
+// such values to a defined severity level, however in some cases values other
+// than the defined levels are useful for comparison.
+//
+// Exmaple:
+//
+// // Effectively disables all logging:
+// SetMinLogLevel(static_cast<absl::LogSeverity>(100));
+//
+// Abseil flags may be defined with type `LogSeverity`. Dependency layering
+// constraints require that the `AbslParseFlag()` overload be declared and
+// defined in the flags library itself rather than here. The `AbslUnparseFlag()`
+// overload is defined there as well for consistency.
+//
+// absl::LogSeverity Flag String Representation
+//
+// An `absl::LogSeverity` has a string representation used for parsing
+// command-line flags based on the enumerator name (e.g. `kFatal`) or
+// its unprefixed name (without the `k`) in any case-insensitive form. (E.g.
+// "FATAL", "fatal" or "Fatal" are all valid.) Unparsing such flags produces an
+// unprefixed string representation in all caps (e.g. "FATAL") or an integer.
+//
+// Additionally, the parser accepts arbitrary integers (as if the type were
+// `int`).
+//
+// Examples:
+//
+// --my_log_level=kInfo
+// --my_log_level=INFO
+// --my_log_level=info
+// --my_log_level=0
+//
+// Unparsing a flag produces the same result as `absl::LogSeverityName()` for
+// the standard levels and a base-ten integer otherwise.
+enum class LogSeverity : int {
+ kInfo = 0,
+ kWarning = 1,
+ kError = 2,
+ kFatal = 3,
+};
+
+// LogSeverities()
+//
+// Returns an iterable of all standard `absl::LogSeverity` values, ordered from
+// least to most severe.
+constexpr std::array<absl::LogSeverity, 4> LogSeverities() {
+ return {{absl::LogSeverity::kInfo, absl::LogSeverity::kWarning,
+ absl::LogSeverity::kError, absl::LogSeverity::kFatal}};
+}
+
+// LogSeverityName()
+//
+// Returns the all-caps string representation (e.g. "INFO") of the specified
+// severity level if it is one of the standard levels and "UNKNOWN" otherwise.
+constexpr const char* LogSeverityName(absl::LogSeverity s) {
+ return s == absl::LogSeverity::kInfo
+ ? "INFO"
+ : s == absl::LogSeverity::kWarning
+ ? "WARNING"
+ : s == absl::LogSeverity::kError
+ ? "ERROR"
+ : s == absl::LogSeverity::kFatal ? "FATAL" : "UNKNOWN";
+}
+
+// NormalizeLogSeverity()
+//
+// Values less than `kInfo` normalize to `kInfo`; values greater than `kFatal`
+// normalize to `kError` (**NOT** `kFatal`).
+constexpr absl::LogSeverity NormalizeLogSeverity(absl::LogSeverity s) {
+ return s < absl::LogSeverity::kInfo
+ ? absl::LogSeverity::kInfo
+ : s > absl::LogSeverity::kFatal ? absl::LogSeverity::kError : s;
+}
+constexpr absl::LogSeverity NormalizeLogSeverity(int s) {
+ return absl::NormalizeLogSeverity(static_cast<absl::LogSeverity>(s));
+}
+
+// operator<<
+//
+// The exact representation of a streamed `absl::LogSeverity` is deliberately
+// unspecified; do not rely on it.
+std::ostream& operator<<(std::ostream& os, absl::LogSeverity s);
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_BASE_LOG_SEVERITY_H_
diff --git a/third_party/abseil/src/absl/base/log_severity_test.cc b/third_party/abseil/src/absl/base/log_severity_test.cc
new file mode 100644
index 0000000..2c6872b
--- /dev/null
+++ b/third_party/abseil/src/absl/base/log_severity_test.cc
@@ -0,0 +1,204 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/base/log_severity.h"
+
+#include <cstdint>
+#include <ios>
+#include <limits>
+#include <ostream>
+#include <sstream>
+#include <string>
+#include <tuple>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/flags/internal/flag.h"
+#include "absl/flags/marshalling.h"
+#include "absl/strings/str_cat.h"
+
+namespace {
+using ::testing::Eq;
+using ::testing::IsFalse;
+using ::testing::IsTrue;
+using ::testing::TestWithParam;
+using ::testing::Values;
+
+std::string StreamHelper(absl::LogSeverity value) {
+ std::ostringstream stream;
+ stream << value;
+ return stream.str();
+}
+
+TEST(StreamTest, Works) {
+ EXPECT_THAT(StreamHelper(static_cast<absl::LogSeverity>(-100)),
+ Eq("absl::LogSeverity(-100)"));
+ EXPECT_THAT(StreamHelper(absl::LogSeverity::kInfo), Eq("INFO"));
+ EXPECT_THAT(StreamHelper(absl::LogSeverity::kWarning), Eq("WARNING"));
+ EXPECT_THAT(StreamHelper(absl::LogSeverity::kError), Eq("ERROR"));
+ EXPECT_THAT(StreamHelper(absl::LogSeverity::kFatal), Eq("FATAL"));
+ EXPECT_THAT(StreamHelper(static_cast<absl::LogSeverity>(4)),
+ Eq("absl::LogSeverity(4)"));
+}
+
+static_assert(
+ absl::flags_internal::FlagUseOneWordStorage<absl::LogSeverity>::value,
+ "Flags of type absl::LogSeverity ought to be lock-free.");
+
+using ParseFlagFromOutOfRangeIntegerTest = TestWithParam<int64_t>;
+INSTANTIATE_TEST_SUITE_P(
+ Instantiation, ParseFlagFromOutOfRangeIntegerTest,
+ Values(static_cast<int64_t>(std::numeric_limits<int>::min()) - 1,
+ static_cast<int64_t>(std::numeric_limits<int>::max()) + 1));
+TEST_P(ParseFlagFromOutOfRangeIntegerTest, ReturnsError) {
+ const std::string to_parse = absl::StrCat(GetParam());
+ absl::LogSeverity value;
+ std::string error;
+ EXPECT_THAT(absl::ParseFlag(to_parse, &value, &error), IsFalse()) << value;
+}
+
+using ParseFlagFromAlmostOutOfRangeIntegerTest = TestWithParam<int>;
+INSTANTIATE_TEST_SUITE_P(Instantiation,
+ ParseFlagFromAlmostOutOfRangeIntegerTest,
+ Values(std::numeric_limits<int>::min(),
+ std::numeric_limits<int>::max()));
+TEST_P(ParseFlagFromAlmostOutOfRangeIntegerTest, YieldsExpectedValue) {
+ const auto expected = static_cast<absl::LogSeverity>(GetParam());
+ const std::string to_parse = absl::StrCat(GetParam());
+ absl::LogSeverity value;
+ std::string error;
+ ASSERT_THAT(absl::ParseFlag(to_parse, &value, &error), IsTrue()) << error;
+ EXPECT_THAT(value, Eq(expected));
+}
+
+using ParseFlagFromIntegerMatchingEnumeratorTest =
+ TestWithParam<std::tuple<absl::string_view, absl::LogSeverity>>;
+INSTANTIATE_TEST_SUITE_P(
+ Instantiation, ParseFlagFromIntegerMatchingEnumeratorTest,
+ Values(std::make_tuple("0", absl::LogSeverity::kInfo),
+ std::make_tuple(" 0", absl::LogSeverity::kInfo),
+ std::make_tuple("-0", absl::LogSeverity::kInfo),
+ std::make_tuple("+0", absl::LogSeverity::kInfo),
+ std::make_tuple("00", absl::LogSeverity::kInfo),
+ std::make_tuple("0 ", absl::LogSeverity::kInfo),
+ std::make_tuple("0x0", absl::LogSeverity::kInfo),
+ std::make_tuple("1", absl::LogSeverity::kWarning),
+ std::make_tuple("+1", absl::LogSeverity::kWarning),
+ std::make_tuple("2", absl::LogSeverity::kError),
+ std::make_tuple("3", absl::LogSeverity::kFatal)));
+TEST_P(ParseFlagFromIntegerMatchingEnumeratorTest, YieldsExpectedValue) {
+ const absl::string_view to_parse = std::get<0>(GetParam());
+ const absl::LogSeverity expected = std::get<1>(GetParam());
+ absl::LogSeverity value;
+ std::string error;
+ ASSERT_THAT(absl::ParseFlag(to_parse, &value, &error), IsTrue()) << error;
+ EXPECT_THAT(value, Eq(expected));
+}
+
+using ParseFlagFromOtherIntegerTest =
+ TestWithParam<std::tuple<absl::string_view, int>>;
+INSTANTIATE_TEST_SUITE_P(Instantiation, ParseFlagFromOtherIntegerTest,
+ Values(std::make_tuple("-1", -1),
+ std::make_tuple("4", 4),
+ std::make_tuple("010", 10),
+ std::make_tuple("0x10", 16)));
+TEST_P(ParseFlagFromOtherIntegerTest, YieldsExpectedValue) {
+ const absl::string_view to_parse = std::get<0>(GetParam());
+ const auto expected = static_cast<absl::LogSeverity>(std::get<1>(GetParam()));
+ absl::LogSeverity value;
+ std::string error;
+ ASSERT_THAT(absl::ParseFlag(to_parse, &value, &error), IsTrue()) << error;
+ EXPECT_THAT(value, Eq(expected));
+}
+
+using ParseFlagFromEnumeratorTest =
+ TestWithParam<std::tuple<absl::string_view, absl::LogSeverity>>;
+INSTANTIATE_TEST_SUITE_P(
+ Instantiation, ParseFlagFromEnumeratorTest,
+ Values(std::make_tuple("INFO", absl::LogSeverity::kInfo),
+ std::make_tuple("info", absl::LogSeverity::kInfo),
+ std::make_tuple("kInfo", absl::LogSeverity::kInfo),
+ std::make_tuple("iNfO", absl::LogSeverity::kInfo),
+ std::make_tuple("kInFo", absl::LogSeverity::kInfo),
+ std::make_tuple("WARNING", absl::LogSeverity::kWarning),
+ std::make_tuple("warning", absl::LogSeverity::kWarning),
+ std::make_tuple("kWarning", absl::LogSeverity::kWarning),
+ std::make_tuple("WaRnInG", absl::LogSeverity::kWarning),
+ std::make_tuple("KwArNiNg", absl::LogSeverity::kWarning),
+ std::make_tuple("ERROR", absl::LogSeverity::kError),
+ std::make_tuple("error", absl::LogSeverity::kError),
+ std::make_tuple("kError", absl::LogSeverity::kError),
+ std::make_tuple("eRrOr", absl::LogSeverity::kError),
+ std::make_tuple("kErRoR", absl::LogSeverity::kError),
+ std::make_tuple("FATAL", absl::LogSeverity::kFatal),
+ std::make_tuple("fatal", absl::LogSeverity::kFatal),
+ std::make_tuple("kFatal", absl::LogSeverity::kFatal),
+ std::make_tuple("FaTaL", absl::LogSeverity::kFatal),
+ std::make_tuple("KfAtAl", absl::LogSeverity::kFatal)));
+TEST_P(ParseFlagFromEnumeratorTest, YieldsExpectedValue) {
+ const absl::string_view to_parse = std::get<0>(GetParam());
+ const absl::LogSeverity expected = std::get<1>(GetParam());
+ absl::LogSeverity value;
+ std::string error;
+ ASSERT_THAT(absl::ParseFlag(to_parse, &value, &error), IsTrue()) << error;
+ EXPECT_THAT(value, Eq(expected));
+}
+
+using ParseFlagFromGarbageTest = TestWithParam<absl::string_view>;
+INSTANTIATE_TEST_SUITE_P(Instantiation, ParseFlagFromGarbageTest,
+ Values("", "\0", " ", "garbage", "kkinfo", "I"));
+TEST_P(ParseFlagFromGarbageTest, ReturnsError) {
+ const absl::string_view to_parse = GetParam();
+ absl::LogSeverity value;
+ std::string error;
+ EXPECT_THAT(absl::ParseFlag(to_parse, &value, &error), IsFalse()) << value;
+}
+
+using UnparseFlagToEnumeratorTest =
+ TestWithParam<std::tuple<absl::LogSeverity, absl::string_view>>;
+INSTANTIATE_TEST_SUITE_P(
+ Instantiation, UnparseFlagToEnumeratorTest,
+ Values(std::make_tuple(absl::LogSeverity::kInfo, "INFO"),
+ std::make_tuple(absl::LogSeverity::kWarning, "WARNING"),
+ std::make_tuple(absl::LogSeverity::kError, "ERROR"),
+ std::make_tuple(absl::LogSeverity::kFatal, "FATAL")));
+TEST_P(UnparseFlagToEnumeratorTest, ReturnsExpectedValueAndRoundTrips) {
+ const absl::LogSeverity to_unparse = std::get<0>(GetParam());
+ const absl::string_view expected = std::get<1>(GetParam());
+ const std::string stringified_value = absl::UnparseFlag(to_unparse);
+ EXPECT_THAT(stringified_value, Eq(expected));
+ absl::LogSeverity reparsed_value;
+ std::string error;
+ EXPECT_THAT(absl::ParseFlag(stringified_value, &reparsed_value, &error),
+ IsTrue());
+ EXPECT_THAT(reparsed_value, Eq(to_unparse));
+}
+
+using UnparseFlagToOtherIntegerTest = TestWithParam<int>;
+INSTANTIATE_TEST_SUITE_P(Instantiation, UnparseFlagToOtherIntegerTest,
+ Values(std::numeric_limits<int>::min(), -1, 4,
+ std::numeric_limits<int>::max()));
+TEST_P(UnparseFlagToOtherIntegerTest, ReturnsExpectedValueAndRoundTrips) {
+ const absl::LogSeverity to_unparse =
+ static_cast<absl::LogSeverity>(GetParam());
+ const std::string expected = absl::StrCat(GetParam());
+ const std::string stringified_value = absl::UnparseFlag(to_unparse);
+ EXPECT_THAT(stringified_value, Eq(expected));
+ absl::LogSeverity reparsed_value;
+ std::string error;
+ EXPECT_THAT(absl::ParseFlag(stringified_value, &reparsed_value, &error),
+ IsTrue());
+ EXPECT_THAT(reparsed_value, Eq(to_unparse));
+}
+} // namespace
diff --git a/third_party/abseil/src/absl/base/macros.h b/third_party/abseil/src/absl/base/macros.h
new file mode 100644
index 0000000..3e085a9
--- /dev/null
+++ b/third_party/abseil/src/absl/base/macros.h
@@ -0,0 +1,158 @@
+//
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: macros.h
+// -----------------------------------------------------------------------------
+//
+// This header file defines the set of language macros used within Abseil code.
+// For the set of macros used to determine supported compilers and platforms,
+// see absl/base/config.h instead.
+//
+// This code is compiled directly on many platforms, including client
+// platforms like Windows, Mac, and embedded systems. Before making
+// any changes here, make sure that you're not breaking any platforms.
+
+#ifndef ABSL_BASE_MACROS_H_
+#define ABSL_BASE_MACROS_H_
+
+#include <cassert>
+#include <cstddef>
+
+#include "absl/base/attributes.h"
+#include "absl/base/config.h"
+#include "absl/base/optimization.h"
+#include "absl/base/port.h"
+
+// ABSL_ARRAYSIZE()
+//
+// Returns the number of elements in an array as a compile-time constant, which
+// can be used in defining new arrays. If you use this macro on a pointer by
+// mistake, you will get a compile-time error.
+#define ABSL_ARRAYSIZE(array) \
+ (sizeof(::absl::macros_internal::ArraySizeHelper(array)))
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace macros_internal {
+// Note: this internal template function declaration is used by ABSL_ARRAYSIZE.
+// The function doesn't need a definition, as we only use its type.
+template <typename T, size_t N>
+auto ArraySizeHelper(const T (&array)[N]) -> char (&)[N];
+} // namespace macros_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+// ABSL_BAD_CALL_IF()
+//
+// Used on a function overload to trap bad calls: any call that matches the
+// overload will cause a compile-time error. This macro uses a clang-specific
+// "enable_if" attribute, as described at
+// https://clang.llvm.org/docs/AttributeReference.html#enable-if
+//
+// Overloads which use this macro should be bracketed by
+// `#ifdef ABSL_BAD_CALL_IF`.
+//
+// Example:
+//
+// int isdigit(int c);
+// #ifdef ABSL_BAD_CALL_IF
+// int isdigit(int c)
+// ABSL_BAD_CALL_IF(c <= -1 || c > 255,
+// "'c' must have the value of an unsigned char or EOF");
+// #endif // ABSL_BAD_CALL_IF
+#if ABSL_HAVE_ATTRIBUTE(enable_if)
+#define ABSL_BAD_CALL_IF(expr, msg) \
+ __attribute__((enable_if(expr, "Bad call trap"), unavailable(msg)))
+#endif
+
+// ABSL_ASSERT()
+//
+// In C++11, `assert` can't be used portably within constexpr functions.
+// ABSL_ASSERT functions as a runtime assert but works in C++11 constexpr
+// functions. Example:
+//
+// constexpr double Divide(double a, double b) {
+// return ABSL_ASSERT(b != 0), a / b;
+// }
+//
+// This macro is inspired by
+// https://akrzemi1.wordpress.com/2017/05/18/asserts-in-constexpr-functions/
+#if defined(NDEBUG)
+#define ABSL_ASSERT(expr) \
+ (false ? static_cast<void>(expr) : static_cast<void>(0))
+#else
+#define ABSL_ASSERT(expr) \
+ (ABSL_PREDICT_TRUE((expr)) ? static_cast<void>(0) \
+ : [] { assert(false && #expr); }()) // NOLINT
+#endif
+
+// `ABSL_INTERNAL_HARDENING_ABORT()` controls how `ABSL_HARDENING_ASSERT()`
+// aborts the program in release mode (when NDEBUG is defined). The
+// implementation should abort the program as quickly as possible and ideally it
+// should not be possible to ignore the abort request.
+#if (ABSL_HAVE_BUILTIN(__builtin_trap) && \
+ ABSL_HAVE_BUILTIN(__builtin_unreachable)) || \
+ (defined(__GNUC__) && !defined(__clang__))
+#define ABSL_INTERNAL_HARDENING_ABORT() \
+ do { \
+ __builtin_trap(); \
+ __builtin_unreachable(); \
+ } while (false)
+#else
+#define ABSL_INTERNAL_HARDENING_ABORT() abort()
+#endif
+
+// ABSL_HARDENING_ASSERT()
+//
+// `ABSL_HARDENING_ASSERT()` is like `ABSL_ASSERT()`, but used to implement
+// runtime assertions that should be enabled in hardened builds even when
+// `NDEBUG` is defined.
+//
+// When `NDEBUG` is not defined, `ABSL_HARDENING_ASSERT()` is identical to
+// `ABSL_ASSERT()`.
+//
+// See `ABSL_OPTION_HARDENED` in `absl/base/options.h` for more information on
+// hardened mode.
+#if ABSL_OPTION_HARDENED == 1 && defined(NDEBUG)
+#define ABSL_HARDENING_ASSERT(expr) \
+ (ABSL_PREDICT_TRUE((expr)) ? static_cast<void>(0) \
+ : [] { ABSL_INTERNAL_HARDENING_ABORT(); }())
+#else
+#define ABSL_HARDENING_ASSERT(expr) ABSL_ASSERT(expr)
+#endif
+
+#ifdef ABSL_HAVE_EXCEPTIONS
+#define ABSL_INTERNAL_TRY try
+#define ABSL_INTERNAL_CATCH_ANY catch (...)
+#define ABSL_INTERNAL_RETHROW do { throw; } while (false)
+#else // ABSL_HAVE_EXCEPTIONS
+#define ABSL_INTERNAL_TRY if (true)
+#define ABSL_INTERNAL_CATCH_ANY else if (false)
+#define ABSL_INTERNAL_RETHROW do {} while (false)
+#endif // ABSL_HAVE_EXCEPTIONS
+
+// `ABSL_INTERNAL_UNREACHABLE` is an unreachable statement. A program which
+// reaches one has undefined behavior, and the compiler may optimize
+// accordingly.
+#if defined(__GNUC__) || ABSL_HAVE_BUILTIN(__builtin_unreachable)
+#define ABSL_INTERNAL_UNREACHABLE __builtin_unreachable()
+#elif defined(_MSC_VER)
+#define ABSL_INTERNAL_UNREACHABLE __assume(0)
+#else
+#define ABSL_INTERNAL_UNREACHABLE
+#endif
+
+#endif // ABSL_BASE_MACROS_H_
diff --git a/third_party/abseil/src/absl/base/optimization.h b/third_party/abseil/src/absl/base/optimization.h
new file mode 100644
index 0000000..393fc3a
--- /dev/null
+++ b/third_party/abseil/src/absl/base/optimization.h
@@ -0,0 +1,241 @@
+//
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: optimization.h
+// -----------------------------------------------------------------------------
+//
+// This header file defines portable macros for performance optimization.
+
+#ifndef ABSL_BASE_OPTIMIZATION_H_
+#define ABSL_BASE_OPTIMIZATION_H_
+
+#include "absl/base/config.h"
+
+// ABSL_BLOCK_TAIL_CALL_OPTIMIZATION
+//
+// Instructs the compiler to avoid optimizing tail-call recursion. Use of this
+// macro is useful when you wish to preserve the existing function order within
+// a stack trace for logging, debugging, or profiling purposes.
+//
+// Example:
+//
+// int f() {
+// int result = g();
+// ABSL_BLOCK_TAIL_CALL_OPTIMIZATION();
+// return result;
+// }
+#if defined(__pnacl__)
+#define ABSL_BLOCK_TAIL_CALL_OPTIMIZATION() if (volatile int x = 0) { (void)x; }
+#elif defined(__clang__)
+// Clang will not tail call given inline volatile assembly.
+#define ABSL_BLOCK_TAIL_CALL_OPTIMIZATION() __asm__ __volatile__("")
+#elif defined(__GNUC__)
+// GCC will not tail call given inline volatile assembly.
+#define ABSL_BLOCK_TAIL_CALL_OPTIMIZATION() __asm__ __volatile__("")
+#elif defined(_MSC_VER)
+#include <intrin.h>
+// The __nop() intrinsic blocks the optimisation.
+#define ABSL_BLOCK_TAIL_CALL_OPTIMIZATION() __nop()
+#else
+#define ABSL_BLOCK_TAIL_CALL_OPTIMIZATION() if (volatile int x = 0) { (void)x; }
+#endif
+
+// ABSL_CACHELINE_SIZE
+//
+// Explicitly defines the size of the L1 cache for purposes of alignment.
+// Setting the cacheline size allows you to specify that certain objects be
+// aligned on a cacheline boundary with `ABSL_CACHELINE_ALIGNED` declarations.
+// (See below.)
+//
+// NOTE: this macro should be replaced with the following C++17 features, when
+// those are generally available:
+//
+// * `std::hardware_constructive_interference_size`
+// * `std::hardware_destructive_interference_size`
+//
+// See http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0154r1.html
+// for more information.
+#if defined(__GNUC__)
+// Cache line alignment
+#if defined(__i386__) || defined(__x86_64__)
+#define ABSL_CACHELINE_SIZE 64
+#elif defined(__powerpc64__)
+#define ABSL_CACHELINE_SIZE 128
+#elif defined(__aarch64__)
+// We would need to read special register ctr_el0 to find out L1 dcache size.
+// This value is a good estimate based on a real aarch64 machine.
+#define ABSL_CACHELINE_SIZE 64
+#elif defined(__arm__)
+// Cache line sizes for ARM: These values are not strictly correct since
+// cache line sizes depend on implementations, not architectures. There
+// are even implementations with cache line sizes configurable at boot
+// time.
+#if defined(__ARM_ARCH_5T__)
+#define ABSL_CACHELINE_SIZE 32
+#elif defined(__ARM_ARCH_7A__)
+#define ABSL_CACHELINE_SIZE 64
+#endif
+#endif
+
+#ifndef ABSL_CACHELINE_SIZE
+// A reasonable default guess. Note that overestimates tend to waste more
+// space, while underestimates tend to waste more time.
+#define ABSL_CACHELINE_SIZE 64
+#endif
+
+// ABSL_CACHELINE_ALIGNED
+//
+// Indicates that the declared object be cache aligned using
+// `ABSL_CACHELINE_SIZE` (see above). Cacheline aligning objects allows you to
+// load a set of related objects in the L1 cache for performance improvements.
+// Cacheline aligning objects properly allows constructive memory sharing and
+// prevents destructive (or "false") memory sharing.
+//
+// NOTE: this macro should be replaced with usage of `alignas()` using
+// `std::hardware_constructive_interference_size` and/or
+// `std::hardware_destructive_interference_size` when available within C++17.
+//
+// See http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0154r1.html
+// for more information.
+//
+// On some compilers, `ABSL_CACHELINE_ALIGNED` expands to an `__attribute__`
+// or `__declspec` attribute. For compilers where this is not known to work,
+// the macro expands to nothing.
+//
+// No further guarantees are made here. The result of applying the macro
+// to variables and types is always implementation-defined.
+//
+// WARNING: It is easy to use this attribute incorrectly, even to the point
+// of causing bugs that are difficult to diagnose, crash, etc. It does not
+// of itself guarantee that objects are aligned to a cache line.
+//
+// NOTE: Some compilers are picky about the locations of annotations such as
+// this attribute, so prefer to put it at the beginning of your declaration.
+// For example,
+//
+// ABSL_CACHELINE_ALIGNED static Foo* foo = ...
+//
+// class ABSL_CACHELINE_ALIGNED Bar { ...
+//
+// Recommendations:
+//
+// 1) Consult compiler documentation; this comment is not kept in sync as
+// toolchains evolve.
+// 2) Verify your use has the intended effect. This often requires inspecting
+// the generated machine code.
+// 3) Prefer applying this attribute to individual variables. Avoid
+// applying it to types. This tends to localize the effect.
+#define ABSL_CACHELINE_ALIGNED __attribute__((aligned(ABSL_CACHELINE_SIZE)))
+#elif defined(_MSC_VER)
+#define ABSL_CACHELINE_SIZE 64
+#define ABSL_CACHELINE_ALIGNED __declspec(align(ABSL_CACHELINE_SIZE))
+#else
+#define ABSL_CACHELINE_SIZE 64
+#define ABSL_CACHELINE_ALIGNED
+#endif
+
+// ABSL_PREDICT_TRUE, ABSL_PREDICT_FALSE
+//
+// Enables the compiler to prioritize compilation using static analysis for
+// likely paths within a boolean branch.
+//
+// Example:
+//
+// if (ABSL_PREDICT_TRUE(expression)) {
+// return result; // Faster if more likely
+// } else {
+// return 0;
+// }
+//
+// Compilers can use the information that a certain branch is not likely to be
+// taken (for instance, a CHECK failure) to optimize for the common case in
+// the absence of better information (ie. compiling gcc with `-fprofile-arcs`).
+//
+// Recommendation: Modern CPUs dynamically predict branch execution paths,
+// typically with accuracy greater than 97%. As a result, annotating every
+// branch in a codebase is likely counterproductive; however, annotating
+// specific branches that are both hot and consistently mispredicted is likely
+// to yield performance improvements.
+#if ABSL_HAVE_BUILTIN(__builtin_expect) || \
+ (defined(__GNUC__) && !defined(__clang__))
+#define ABSL_PREDICT_FALSE(x) (__builtin_expect(false || (x), false))
+#define ABSL_PREDICT_TRUE(x) (__builtin_expect(false || (x), true))
+#else
+#define ABSL_PREDICT_FALSE(x) (x)
+#define ABSL_PREDICT_TRUE(x) (x)
+#endif
+
+// ABSL_INTERNAL_ASSUME(cond)
+// Informs the compiler that a condition is always true and that it can assume
+// it to be true for optimization purposes. The call has undefined behavior if
+// the condition is false.
+// In !NDEBUG mode, the condition is checked with an assert().
+// NOTE: The expression must not have side effects, as it will only be evaluated
+// in some compilation modes and not others.
+//
+// Example:
+//
+// int x = ...;
+// ABSL_INTERNAL_ASSUME(x >= 0);
+// // The compiler can optimize the division to a simple right shift using the
+// // assumption specified above.
+// int y = x / 16;
+//
+#if !defined(NDEBUG)
+#define ABSL_INTERNAL_ASSUME(cond) assert(cond)
+#elif ABSL_HAVE_BUILTIN(__builtin_assume)
+#define ABSL_INTERNAL_ASSUME(cond) __builtin_assume(cond)
+#elif defined(__GNUC__) || ABSL_HAVE_BUILTIN(__builtin_unreachable)
+#define ABSL_INTERNAL_ASSUME(cond) \
+ do { \
+ if (!(cond)) __builtin_unreachable(); \
+ } while (0)
+#elif defined(_MSC_VER)
+#define ABSL_INTERNAL_ASSUME(cond) __assume(cond)
+#else
+#define ABSL_INTERNAL_ASSUME(cond) \
+ do { \
+ static_cast<void>(false && (cond)); \
+ } while (0)
+#endif
+
+// ABSL_INTERNAL_UNIQUE_SMALL_NAME(cond)
+// This macro forces small unique name on a static file level symbols like
+// static local variables or static functions. This is intended to be used in
+// macro definitions to optimize the cost of generated code. Do NOT use it on
+// symbols exported from translation unit since it may casue a link time
+// conflict.
+//
+// Example:
+//
+// #define MY_MACRO(txt)
+// namespace {
+// char VeryVeryLongVarName[] ABSL_INTERNAL_UNIQUE_SMALL_NAME() = txt;
+// const char* VeryVeryLongFuncName() ABSL_INTERNAL_UNIQUE_SMALL_NAME();
+// const char* VeryVeryLongFuncName() { return txt; }
+// }
+//
+
+#if defined(__GNUC__)
+#define ABSL_INTERNAL_UNIQUE_SMALL_NAME2(x) #x
+#define ABSL_INTERNAL_UNIQUE_SMALL_NAME1(x) ABSL_INTERNAL_UNIQUE_SMALL_NAME2(x)
+#define ABSL_INTERNAL_UNIQUE_SMALL_NAME() \
+ asm(ABSL_INTERNAL_UNIQUE_SMALL_NAME1(.absl.__COUNTER__))
+#else
+#define ABSL_INTERNAL_UNIQUE_SMALL_NAME()
+#endif
+
+#endif // ABSL_BASE_OPTIMIZATION_H_
diff --git a/third_party/abseil/src/absl/base/optimization_test.cc b/third_party/abseil/src/absl/base/optimization_test.cc
new file mode 100644
index 0000000..e83369f
--- /dev/null
+++ b/third_party/abseil/src/absl/base/optimization_test.cc
@@ -0,0 +1,129 @@
+// Copyright 2020 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/base/optimization.h"
+
+#include "gtest/gtest.h"
+#include "absl/types/optional.h"
+
+namespace {
+
+// Tests for the ABSL_PREDICT_TRUE and ABSL_PREDICT_FALSE macros.
+// The tests only verify that the macros are functionally correct - i.e. code
+// behaves as if they weren't used. They don't try to check their impact on
+// optimization.
+
+TEST(PredictTest, PredictTrue) {
+ EXPECT_TRUE(ABSL_PREDICT_TRUE(true));
+ EXPECT_FALSE(ABSL_PREDICT_TRUE(false));
+ EXPECT_TRUE(ABSL_PREDICT_TRUE(1 == 1));
+ EXPECT_FALSE(ABSL_PREDICT_TRUE(1 == 2));
+
+ if (ABSL_PREDICT_TRUE(false)) ADD_FAILURE();
+ if (!ABSL_PREDICT_TRUE(true)) ADD_FAILURE();
+
+ EXPECT_TRUE(ABSL_PREDICT_TRUE(true) && true);
+ EXPECT_TRUE(ABSL_PREDICT_TRUE(true) || false);
+}
+
+TEST(PredictTest, PredictFalse) {
+ EXPECT_TRUE(ABSL_PREDICT_FALSE(true));
+ EXPECT_FALSE(ABSL_PREDICT_FALSE(false));
+ EXPECT_TRUE(ABSL_PREDICT_FALSE(1 == 1));
+ EXPECT_FALSE(ABSL_PREDICT_FALSE(1 == 2));
+
+ if (ABSL_PREDICT_FALSE(false)) ADD_FAILURE();
+ if (!ABSL_PREDICT_FALSE(true)) ADD_FAILURE();
+
+ EXPECT_TRUE(ABSL_PREDICT_FALSE(true) && true);
+ EXPECT_TRUE(ABSL_PREDICT_FALSE(true) || false);
+}
+
+TEST(PredictTest, OneEvaluation) {
+ // Verify that the expression is only evaluated once.
+ int x = 0;
+ if (ABSL_PREDICT_TRUE((++x) == 0)) ADD_FAILURE();
+ EXPECT_EQ(x, 1);
+ if (ABSL_PREDICT_FALSE((++x) == 0)) ADD_FAILURE();
+ EXPECT_EQ(x, 2);
+}
+
+TEST(PredictTest, OperatorOrder) {
+ // Verify that operator order inside and outside the macro behaves well.
+ // These would fail for a naive '#define ABSL_PREDICT_TRUE(x) x'
+ EXPECT_TRUE(ABSL_PREDICT_TRUE(1 && 2) == true);
+ EXPECT_TRUE(ABSL_PREDICT_FALSE(1 && 2) == true);
+ EXPECT_TRUE(!ABSL_PREDICT_TRUE(1 == 2));
+ EXPECT_TRUE(!ABSL_PREDICT_FALSE(1 == 2));
+}
+
+TEST(PredictTest, Pointer) {
+ const int x = 3;
+ const int *good_intptr = &x;
+ const int *null_intptr = nullptr;
+ EXPECT_TRUE(ABSL_PREDICT_TRUE(good_intptr));
+ EXPECT_FALSE(ABSL_PREDICT_TRUE(null_intptr));
+ EXPECT_TRUE(ABSL_PREDICT_FALSE(good_intptr));
+ EXPECT_FALSE(ABSL_PREDICT_FALSE(null_intptr));
+}
+
+TEST(PredictTest, Optional) {
+ // Note: An optional's truth value is the value's existence, not its truth.
+ absl::optional<bool> has_value(false);
+ absl::optional<bool> no_value;
+ EXPECT_TRUE(ABSL_PREDICT_TRUE(has_value));
+ EXPECT_FALSE(ABSL_PREDICT_TRUE(no_value));
+ EXPECT_TRUE(ABSL_PREDICT_FALSE(has_value));
+ EXPECT_FALSE(ABSL_PREDICT_FALSE(no_value));
+}
+
+class ImplictlyConvertibleToBool {
+ public:
+ explicit ImplictlyConvertibleToBool(bool value) : value_(value) {}
+ operator bool() const { // NOLINT(google-explicit-constructor)
+ return value_;
+ }
+
+ private:
+ bool value_;
+};
+
+TEST(PredictTest, ImplicitBoolConversion) {
+ const ImplictlyConvertibleToBool is_true(true);
+ const ImplictlyConvertibleToBool is_false(false);
+ if (!ABSL_PREDICT_TRUE(is_true)) ADD_FAILURE();
+ if (ABSL_PREDICT_TRUE(is_false)) ADD_FAILURE();
+ if (!ABSL_PREDICT_FALSE(is_true)) ADD_FAILURE();
+ if (ABSL_PREDICT_FALSE(is_false)) ADD_FAILURE();
+}
+
+class ExplictlyConvertibleToBool {
+ public:
+ explicit ExplictlyConvertibleToBool(bool value) : value_(value) {}
+ explicit operator bool() const { return value_; }
+
+ private:
+ bool value_;
+};
+
+TEST(PredictTest, ExplicitBoolConversion) {
+ const ExplictlyConvertibleToBool is_true(true);
+ const ExplictlyConvertibleToBool is_false(false);
+ if (!ABSL_PREDICT_TRUE(is_true)) ADD_FAILURE();
+ if (ABSL_PREDICT_TRUE(is_false)) ADD_FAILURE();
+ if (!ABSL_PREDICT_FALSE(is_true)) ADD_FAILURE();
+ if (ABSL_PREDICT_FALSE(is_false)) ADD_FAILURE();
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/base/options.h b/third_party/abseil/src/absl/base/options.h
new file mode 100644
index 0000000..230bf1e
--- /dev/null
+++ b/third_party/abseil/src/absl/base/options.h
@@ -0,0 +1,238 @@
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: options.h
+// -----------------------------------------------------------------------------
+//
+// This file contains Abseil configuration options for setting specific
+// implementations instead of letting Abseil determine which implementation to
+// use at compile-time. Setting these options may be useful for package or build
+// managers who wish to guarantee ABI stability within binary builds (which are
+// otherwise difficult to enforce).
+//
+// *** IMPORTANT NOTICE FOR PACKAGE MANAGERS: It is important that
+// maintainers of package managers who wish to package Abseil read and
+// understand this file! ***
+//
+// Abseil contains a number of possible configuration endpoints, based on
+// parameters such as the detected platform, language version, or command-line
+// flags used to invoke the underlying binary. As is the case with all
+// libraries, binaries which contain Abseil code must ensure that separate
+// packages use the same compiled copy of Abseil to avoid a diamond dependency
+// problem, which can occur if two packages built with different Abseil
+// configuration settings are linked together. Diamond dependency problems in
+// C++ may manifest as violations to the One Definition Rule (ODR) (resulting in
+// linker errors), or undefined behavior (resulting in crashes).
+//
+// Diamond dependency problems can be avoided if all packages utilize the same
+// exact version of Abseil. Building from source code with the same compilation
+// parameters is the easiest way to avoid such dependency problems. However, for
+// package managers who cannot control such compilation parameters, we are
+// providing the file to allow you to inject ABI (Application Binary Interface)
+// stability across builds. Settings options in this file will neither change
+// API nor ABI, providing a stable copy of Abseil between packages.
+//
+// Care must be taken to keep options within these configurations isolated
+// from any other dynamic settings, such as command-line flags which could alter
+// these options. This file is provided specifically to help build and package
+// managers provide a stable copy of Abseil within their libraries and binaries;
+// other developers should not have need to alter the contents of this file.
+//
+// -----------------------------------------------------------------------------
+// Usage
+// -----------------------------------------------------------------------------
+//
+// For any particular package release, set the appropriate definitions within
+// this file to whatever value makes the most sense for your package(s). Note
+// that, by default, most of these options, at the moment, affect the
+// implementation of types; future options may affect other implementation
+// details.
+//
+// NOTE: the defaults within this file all assume that Abseil can select the
+// proper Abseil implementation at compile-time, which will not be sufficient
+// to guarantee ABI stability to package managers.
+
+#ifndef ABSL_BASE_OPTIONS_H_
+#define ABSL_BASE_OPTIONS_H_
+
+// Include a standard library header to allow configuration based on the
+// standard library in use.
+#ifdef __cplusplus
+#include <ciso646>
+#endif
+
+// -----------------------------------------------------------------------------
+// Type Compatibility Options
+// -----------------------------------------------------------------------------
+//
+// ABSL_OPTION_USE_STD_ANY
+//
+// This option controls whether absl::any is implemented as an alias to
+// std::any, or as an independent implementation.
+//
+// A value of 0 means to use Abseil's implementation. This requires only C++11
+// support, and is expected to work on every toolchain we support.
+//
+// A value of 1 means to use an alias to std::any. This requires that all code
+// using Abseil is built in C++17 mode or later.
+//
+// A value of 2 means to detect the C++ version being used to compile Abseil,
+// and use an alias only if a working std::any is available. This option is
+// useful when you are building your entire program, including all of its
+// dependencies, from source. It should not be used otherwise -- for example,
+// if you are distributing Abseil in a binary package manager -- since in
+// mode 2, absl::any will name a different type, with a different mangled name
+// and binary layout, depending on the compiler flags passed by the end user.
+// For more info, see https://abseil.io/about/design/dropin-types.
+//
+// User code should not inspect this macro. To check in the preprocessor if
+// absl::any is a typedef of std::any, use the feature macro ABSL_USES_STD_ANY.
+
+#define ABSL_OPTION_USE_STD_ANY 2
+
+
+// ABSL_OPTION_USE_STD_OPTIONAL
+//
+// This option controls whether absl::optional is implemented as an alias to
+// std::optional, or as an independent implementation.
+//
+// A value of 0 means to use Abseil's implementation. This requires only C++11
+// support, and is expected to work on every toolchain we support.
+//
+// A value of 1 means to use an alias to std::optional. This requires that all
+// code using Abseil is built in C++17 mode or later.
+//
+// A value of 2 means to detect the C++ version being used to compile Abseil,
+// and use an alias only if a working std::optional is available. This option
+// is useful when you are building your program from source. It should not be
+// used otherwise -- for example, if you are distributing Abseil in a binary
+// package manager -- since in mode 2, absl::optional will name a different
+// type, with a different mangled name and binary layout, depending on the
+// compiler flags passed by the end user. For more info, see
+// https://abseil.io/about/design/dropin-types.
+
+// User code should not inspect this macro. To check in the preprocessor if
+// absl::optional is a typedef of std::optional, use the feature macro
+// ABSL_USES_STD_OPTIONAL.
+
+#define ABSL_OPTION_USE_STD_OPTIONAL 2
+
+
+// ABSL_OPTION_USE_STD_STRING_VIEW
+//
+// This option controls whether absl::string_view is implemented as an alias to
+// std::string_view, or as an independent implementation.
+//
+// A value of 0 means to use Abseil's implementation. This requires only C++11
+// support, and is expected to work on every toolchain we support.
+//
+// A value of 1 means to use an alias to std::string_view. This requires that
+// all code using Abseil is built in C++17 mode or later.
+//
+// A value of 2 means to detect the C++ version being used to compile Abseil,
+// and use an alias only if a working std::string_view is available. This
+// option is useful when you are building your program from source. It should
+// not be used otherwise -- for example, if you are distributing Abseil in a
+// binary package manager -- since in mode 2, absl::string_view will name a
+// different type, with a different mangled name and binary layout, depending on
+// the compiler flags passed by the end user. For more info, see
+// https://abseil.io/about/design/dropin-types.
+//
+// User code should not inspect this macro. To check in the preprocessor if
+// absl::string_view is a typedef of std::string_view, use the feature macro
+// ABSL_USES_STD_STRING_VIEW.
+
+#define ABSL_OPTION_USE_STD_STRING_VIEW 2
+
+// ABSL_OPTION_USE_STD_VARIANT
+//
+// This option controls whether absl::variant is implemented as an alias to
+// std::variant, or as an independent implementation.
+//
+// A value of 0 means to use Abseil's implementation. This requires only C++11
+// support, and is expected to work on every toolchain we support.
+//
+// A value of 1 means to use an alias to std::variant. This requires that all
+// code using Abseil is built in C++17 mode or later.
+//
+// A value of 2 means to detect the C++ version being used to compile Abseil,
+// and use an alias only if a working std::variant is available. This option
+// is useful when you are building your program from source. It should not be
+// used otherwise -- for example, if you are distributing Abseil in a binary
+// package manager -- since in mode 2, absl::variant will name a different
+// type, with a different mangled name and binary layout, depending on the
+// compiler flags passed by the end user. For more info, see
+// https://abseil.io/about/design/dropin-types.
+//
+// User code should not inspect this macro. To check in the preprocessor if
+// absl::variant is a typedef of std::variant, use the feature macro
+// ABSL_USES_STD_VARIANT.
+
+#define ABSL_OPTION_USE_STD_VARIANT 2
+
+
+// ABSL_OPTION_USE_INLINE_NAMESPACE
+// ABSL_OPTION_INLINE_NAMESPACE_NAME
+//
+// These options controls whether all entities in the absl namespace are
+// contained within an inner inline namespace. This does not affect the
+// user-visible API of Abseil, but it changes the mangled names of all symbols.
+//
+// This can be useful as a version tag if you are distributing Abseil in
+// precompiled form. This will prevent a binary library build of Abseil with
+// one inline namespace being used with headers configured with a different
+// inline namespace name. Binary packagers are reminded that Abseil does not
+// guarantee any ABI stability in Abseil, so any update of Abseil or
+// configuration change in such a binary package should be combined with a
+// new, unique value for the inline namespace name.
+//
+// A value of 0 means not to use inline namespaces.
+//
+// A value of 1 means to use an inline namespace with the given name inside
+// namespace absl. If this is set, ABSL_OPTION_INLINE_NAMESPACE_NAME must also
+// be changed to a new, unique identifier name. In particular "head" is not
+// allowed.
+
+#define ABSL_OPTION_USE_INLINE_NAMESPACE 0
+#define ABSL_OPTION_INLINE_NAMESPACE_NAME head
+
+// ABSL_OPTION_HARDENED
+//
+// This option enables a "hardened" build in release mode (in this context,
+// release mode is defined as a build where the `NDEBUG` macro is defined).
+//
+// A value of 0 means that "hardened" mode is not enabled.
+//
+// A value of 1 means that "hardened" mode is enabled.
+//
+// Hardened builds have additional security checks enabled when `NDEBUG` is
+// defined. Defining `NDEBUG` is normally used to turn `assert()` macro into a
+// no-op, as well as disabling other bespoke program consistency checks. By
+// defining ABSL_OPTION_HARDENED to 1, a select set of checks remain enabled in
+// release mode. These checks guard against programming errors that may lead to
+// security vulnerabilities. In release mode, when one of these programming
+// errors is encountered, the program will immediately abort, possibly without
+// any attempt at logging.
+//
+// The checks enabled by this option are not free; they do incur runtime cost.
+//
+// The checks enabled by this option are always active when `NDEBUG` is not
+// defined, even in the case when ABSL_OPTION_HARDENED is defined to 0. The
+// checks enabled by this option may abort the program in a different way and
+// log additional information when `NDEBUG` is not defined.
+
+#define ABSL_OPTION_HARDENED 0
+
+#endif // ABSL_BASE_OPTIONS_H_
diff --git a/third_party/abseil/src/absl/base/policy_checks.h b/third_party/abseil/src/absl/base/policy_checks.h
new file mode 100644
index 0000000..06b3243
--- /dev/null
+++ b/third_party/abseil/src/absl/base/policy_checks.h
@@ -0,0 +1,111 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: policy_checks.h
+// -----------------------------------------------------------------------------
+//
+// This header enforces a minimum set of policies at build time, such as the
+// supported compiler and library versions. Unsupported configurations are
+// reported with `#error`. This enforcement is best effort, so successfully
+// compiling this header does not guarantee a supported configuration.
+
+#ifndef ABSL_BASE_POLICY_CHECKS_H_
+#define ABSL_BASE_POLICY_CHECKS_H_
+
+// Included for the __GLIBC_PREREQ macro used below.
+#include <limits.h>
+
+// Included for the _STLPORT_VERSION macro used below.
+#if defined(__cplusplus)
+#include <cstddef>
+#endif
+
+// -----------------------------------------------------------------------------
+// Operating System Check
+// -----------------------------------------------------------------------------
+
+#if defined(__CYGWIN__)
+#error "Cygwin is not supported."
+#endif
+
+// -----------------------------------------------------------------------------
+// Toolchain Check
+// -----------------------------------------------------------------------------
+
+// We support MSVC++ 14.0 update 2 and later.
+// This minimum will go up.
+#if defined(_MSC_FULL_VER) && _MSC_FULL_VER < 190023918 && !defined(__clang__)
+#error "This package requires Visual Studio 2015 Update 2 or higher."
+#endif
+
+// We support gcc 4.7 and later.
+// This minimum will go up.
+#if defined(__GNUC__) && !defined(__clang__)
+#if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 7)
+#error "This package requires gcc 4.7 or higher."
+#endif
+#endif
+
+// We support Apple Xcode clang 4.2.1 (version 421.11.65) and later.
+// This corresponds to Apple Xcode version 4.5.
+// This minimum will go up.
+#if defined(__apple_build_version__) && __apple_build_version__ < 4211165
+#error "This package requires __apple_build_version__ of 4211165 or higher."
+#endif
+
+// -----------------------------------------------------------------------------
+// C++ Version Check
+// -----------------------------------------------------------------------------
+
+// Enforce C++11 as the minimum. Note that Visual Studio has not
+// advanced __cplusplus despite being good enough for our purposes, so
+// so we exempt it from the check.
+#if defined(__cplusplus) && !defined(_MSC_VER)
+#if __cplusplus < 201103L
+#error "C++ versions less than C++11 are not supported."
+#endif
+#endif
+
+// -----------------------------------------------------------------------------
+// Standard Library Check
+// -----------------------------------------------------------------------------
+
+#if defined(_STLPORT_VERSION)
+#error "STLPort is not supported."
+#endif
+
+// -----------------------------------------------------------------------------
+// `char` Size Check
+// -----------------------------------------------------------------------------
+
+// Abseil currently assumes CHAR_BIT == 8. If you would like to use Abseil on a
+// platform where this is not the case, please provide us with the details about
+// your platform so we can consider relaxing this requirement.
+#if CHAR_BIT != 8
+#error "Abseil assumes CHAR_BIT == 8."
+#endif
+
+// -----------------------------------------------------------------------------
+// `int` Size Check
+// -----------------------------------------------------------------------------
+
+// Abseil currently assumes that an int is 4 bytes. If you would like to use
+// Abseil on a platform where this is not the case, please provide us with the
+// details about your platform so we can consider relaxing this requirement.
+#if INT_MAX < 2147483647
+#error "Abseil assumes that int is at least 4 bytes. "
+#endif
+
+#endif // ABSL_BASE_POLICY_CHECKS_H_
diff --git a/third_party/abseil/src/absl/base/port.h b/third_party/abseil/src/absl/base/port.h
new file mode 100644
index 0000000..6c28068
--- /dev/null
+++ b/third_party/abseil/src/absl/base/port.h
@@ -0,0 +1,26 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// This files is a forwarding header for other headers containing various
+// portability macros and functions.
+// This file is used for both C and C++!
+
+#ifndef ABSL_BASE_PORT_H_
+#define ABSL_BASE_PORT_H_
+
+#include "absl/base/attributes.h"
+#include "absl/base/config.h"
+#include "absl/base/optimization.h"
+
+#endif // ABSL_BASE_PORT_H_
diff --git a/third_party/abseil/src/absl/base/raw_logging_test.cc b/third_party/abseil/src/absl/base/raw_logging_test.cc
new file mode 100644
index 0000000..3d30bd3
--- /dev/null
+++ b/third_party/abseil/src/absl/base/raw_logging_test.cc
@@ -0,0 +1,79 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// This test serves primarily as a compilation test for base/raw_logging.h.
+// Raw logging testing is covered by logging_unittest.cc, which is not as
+// portable as this test.
+
+#include "absl/base/internal/raw_logging.h"
+
+#include <tuple>
+
+#include "gtest/gtest.h"
+#include "absl/strings/str_cat.h"
+
+namespace {
+
+TEST(RawLoggingCompilationTest, Log) {
+ ABSL_RAW_LOG(INFO, "RAW INFO: %d", 1);
+ ABSL_RAW_LOG(INFO, "RAW INFO: %d %d", 1, 2);
+ ABSL_RAW_LOG(INFO, "RAW INFO: %d %d %d", 1, 2, 3);
+ ABSL_RAW_LOG(INFO, "RAW INFO: %d %d %d %d", 1, 2, 3, 4);
+ ABSL_RAW_LOG(INFO, "RAW INFO: %d %d %d %d %d", 1, 2, 3, 4, 5);
+ ABSL_RAW_LOG(WARNING, "RAW WARNING: %d", 1);
+ ABSL_RAW_LOG(ERROR, "RAW ERROR: %d", 1);
+}
+
+TEST(RawLoggingCompilationTest, PassingCheck) {
+ ABSL_RAW_CHECK(true, "RAW CHECK");
+}
+
+// Not all platforms support output from raw log, so we don't verify any
+// particular output for RAW check failures (expecting the empty string
+// accomplishes this). This test is primarily a compilation test, but we
+// are verifying process death when EXPECT_DEATH works for a platform.
+const char kExpectedDeathOutput[] = "";
+
+TEST(RawLoggingDeathTest, FailingCheck) {
+ EXPECT_DEATH_IF_SUPPORTED(ABSL_RAW_CHECK(1 == 0, "explanation"),
+ kExpectedDeathOutput);
+}
+
+TEST(RawLoggingDeathTest, LogFatal) {
+ EXPECT_DEATH_IF_SUPPORTED(ABSL_RAW_LOG(FATAL, "my dog has fleas"),
+ kExpectedDeathOutput);
+}
+
+TEST(InternalLog, CompilationTest) {
+ ABSL_INTERNAL_LOG(INFO, "Internal Log");
+ std::string log_msg = "Internal Log";
+ ABSL_INTERNAL_LOG(INFO, log_msg);
+
+ ABSL_INTERNAL_LOG(INFO, log_msg + " 2");
+
+ float d = 1.1f;
+ ABSL_INTERNAL_LOG(INFO, absl::StrCat("Internal log ", 3, " + ", d));
+}
+
+TEST(InternalLogDeathTest, FailingCheck) {
+ EXPECT_DEATH_IF_SUPPORTED(ABSL_INTERNAL_CHECK(1 == 0, "explanation"),
+ kExpectedDeathOutput);
+}
+
+TEST(InternalLogDeathTest, LogFatal) {
+ EXPECT_DEATH_IF_SUPPORTED(ABSL_INTERNAL_LOG(FATAL, "my dog has fleas"),
+ kExpectedDeathOutput);
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/base/spinlock_test_common.cc b/third_party/abseil/src/absl/base/spinlock_test_common.cc
new file mode 100644
index 0000000..dee266e
--- /dev/null
+++ b/third_party/abseil/src/absl/base/spinlock_test_common.cc
@@ -0,0 +1,271 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// A bunch of threads repeatedly hash an array of ints protected by a
+// spinlock. If the spinlock is working properly, all elements of the
+// array should be equal at the end of the test.
+
+#include <cstdint>
+#include <limits>
+#include <random>
+#include <thread> // NOLINT(build/c++11)
+#include <type_traits>
+#include <vector>
+
+#include "gtest/gtest.h"
+#include "absl/base/attributes.h"
+#include "absl/base/config.h"
+#include "absl/base/internal/low_level_scheduling.h"
+#include "absl/base/internal/scheduling_mode.h"
+#include "absl/base/internal/spinlock.h"
+#include "absl/base/internal/sysinfo.h"
+#include "absl/base/macros.h"
+#include "absl/synchronization/blocking_counter.h"
+#include "absl/synchronization/notification.h"
+
+constexpr int32_t kNumThreads = 10;
+constexpr int32_t kIters = 1000;
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace base_internal {
+
+// This is defined outside of anonymous namespace so that it can be
+// a friend of SpinLock to access protected methods for testing.
+struct SpinLockTest {
+ static uint32_t EncodeWaitCycles(int64_t wait_start_time,
+ int64_t wait_end_time) {
+ return SpinLock::EncodeWaitCycles(wait_start_time, wait_end_time);
+ }
+ static uint64_t DecodeWaitCycles(uint32_t lock_value) {
+ return SpinLock::DecodeWaitCycles(lock_value);
+ }
+};
+
+namespace {
+
+static constexpr int kArrayLength = 10;
+static uint32_t values[kArrayLength];
+
+ABSL_CONST_INIT static SpinLock static_cooperative_spinlock(
+ absl::kConstInit, base_internal::SCHEDULE_COOPERATIVE_AND_KERNEL);
+ABSL_CONST_INIT static SpinLock static_noncooperative_spinlock(
+ absl::kConstInit, base_internal::SCHEDULE_KERNEL_ONLY);
+
+// Simple integer hash function based on the public domain lookup2 hash.
+// http://burtleburtle.net/bob/c/lookup2.c
+static uint32_t Hash32(uint32_t a, uint32_t c) {
+ uint32_t b = 0x9e3779b9UL; // The golden ratio; an arbitrary value.
+ a -= b; a -= c; a ^= (c >> 13);
+ b -= c; b -= a; b ^= (a << 8);
+ c -= a; c -= b; c ^= (b >> 13);
+ a -= b; a -= c; a ^= (c >> 12);
+ b -= c; b -= a; b ^= (a << 16);
+ c -= a; c -= b; c ^= (b >> 5);
+ a -= b; a -= c; a ^= (c >> 3);
+ b -= c; b -= a; b ^= (a << 10);
+ c -= a; c -= b; c ^= (b >> 15);
+ return c;
+}
+
+static void TestFunction(int thread_salt, SpinLock* spinlock) {
+ for (int i = 0; i < kIters; i++) {
+ SpinLockHolder h(spinlock);
+ for (int j = 0; j < kArrayLength; j++) {
+ const int index = (j + thread_salt) % kArrayLength;
+ values[index] = Hash32(values[index], thread_salt);
+ std::this_thread::yield();
+ }
+ }
+}
+
+static void ThreadedTest(SpinLock* spinlock) {
+ std::vector<std::thread> threads;
+ for (int i = 0; i < kNumThreads; ++i) {
+ threads.push_back(std::thread(TestFunction, i, spinlock));
+ }
+ for (auto& thread : threads) {
+ thread.join();
+ }
+
+ SpinLockHolder h(spinlock);
+ for (int i = 1; i < kArrayLength; i++) {
+ EXPECT_EQ(values[0], values[i]);
+ }
+}
+
+#ifndef ABSL_HAVE_THREAD_SANITIZER
+static_assert(std::is_trivially_destructible<SpinLock>(), "");
+#endif
+
+TEST(SpinLock, StackNonCooperativeDisablesScheduling) {
+ SpinLock spinlock(base_internal::SCHEDULE_KERNEL_ONLY);
+ spinlock.Lock();
+ EXPECT_FALSE(base_internal::SchedulingGuard::ReschedulingIsAllowed());
+ spinlock.Unlock();
+}
+
+TEST(SpinLock, StaticNonCooperativeDisablesScheduling) {
+ static_noncooperative_spinlock.Lock();
+ EXPECT_FALSE(base_internal::SchedulingGuard::ReschedulingIsAllowed());
+ static_noncooperative_spinlock.Unlock();
+}
+
+TEST(SpinLock, WaitCyclesEncoding) {
+ // These are implementation details not exported by SpinLock.
+ const int kProfileTimestampShift = 7;
+ const int kLockwordReservedShift = 3;
+ const uint32_t kSpinLockSleeper = 8;
+
+ // We should be able to encode up to (1^kMaxCycleBits - 1) without clamping
+ // but the lower kProfileTimestampShift will be dropped.
+ const int kMaxCyclesShift =
+ 32 - kLockwordReservedShift + kProfileTimestampShift;
+ const uint64_t kMaxCycles = (int64_t{1} << kMaxCyclesShift) - 1;
+
+ // These bits should be zero after encoding.
+ const uint32_t kLockwordReservedMask = (1 << kLockwordReservedShift) - 1;
+
+ // These bits are dropped when wait cycles are encoded.
+ const uint64_t kProfileTimestampMask = (1 << kProfileTimestampShift) - 1;
+
+ // Test a bunch of random values
+ std::default_random_engine generator;
+ // Shift to avoid overflow below.
+ std::uniform_int_distribution<uint64_t> time_distribution(
+ 0, std::numeric_limits<uint64_t>::max() >> 4);
+ std::uniform_int_distribution<uint64_t> cycle_distribution(0, kMaxCycles);
+
+ for (int i = 0; i < 100; i++) {
+ int64_t start_time = time_distribution(generator);
+ int64_t cycles = cycle_distribution(generator);
+ int64_t end_time = start_time + cycles;
+ uint32_t lock_value = SpinLockTest::EncodeWaitCycles(start_time, end_time);
+ EXPECT_EQ(0, lock_value & kLockwordReservedMask);
+ uint64_t decoded = SpinLockTest::DecodeWaitCycles(lock_value);
+ EXPECT_EQ(0, decoded & kProfileTimestampMask);
+ EXPECT_EQ(cycles & ~kProfileTimestampMask, decoded);
+ }
+
+ // Test corner cases
+ int64_t start_time = time_distribution(generator);
+ EXPECT_EQ(kSpinLockSleeper,
+ SpinLockTest::EncodeWaitCycles(start_time, start_time));
+ EXPECT_EQ(0, SpinLockTest::DecodeWaitCycles(0));
+ EXPECT_EQ(0, SpinLockTest::DecodeWaitCycles(kLockwordReservedMask));
+ EXPECT_EQ(kMaxCycles & ~kProfileTimestampMask,
+ SpinLockTest::DecodeWaitCycles(~kLockwordReservedMask));
+
+ // Check that we cannot produce kSpinLockSleeper during encoding.
+ int64_t sleeper_cycles =
+ kSpinLockSleeper << (kProfileTimestampShift - kLockwordReservedShift);
+ uint32_t sleeper_value =
+ SpinLockTest::EncodeWaitCycles(start_time, start_time + sleeper_cycles);
+ EXPECT_NE(sleeper_value, kSpinLockSleeper);
+
+ // Test clamping
+ uint32_t max_value =
+ SpinLockTest::EncodeWaitCycles(start_time, start_time + kMaxCycles);
+ uint64_t max_value_decoded = SpinLockTest::DecodeWaitCycles(max_value);
+ uint64_t expected_max_value_decoded = kMaxCycles & ~kProfileTimestampMask;
+ EXPECT_EQ(expected_max_value_decoded, max_value_decoded);
+
+ const int64_t step = (1 << kProfileTimestampShift);
+ uint32_t after_max_value =
+ SpinLockTest::EncodeWaitCycles(start_time, start_time + kMaxCycles + step);
+ uint64_t after_max_value_decoded =
+ SpinLockTest::DecodeWaitCycles(after_max_value);
+ EXPECT_EQ(expected_max_value_decoded, after_max_value_decoded);
+
+ uint32_t before_max_value = SpinLockTest::EncodeWaitCycles(
+ start_time, start_time + kMaxCycles - step);
+ uint64_t before_max_value_decoded =
+ SpinLockTest::DecodeWaitCycles(before_max_value);
+ EXPECT_GT(expected_max_value_decoded, before_max_value_decoded);
+}
+
+TEST(SpinLockWithThreads, StackSpinLock) {
+ SpinLock spinlock;
+ ThreadedTest(&spinlock);
+}
+
+TEST(SpinLockWithThreads, StackCooperativeSpinLock) {
+ SpinLock spinlock(base_internal::SCHEDULE_COOPERATIVE_AND_KERNEL);
+ ThreadedTest(&spinlock);
+}
+
+TEST(SpinLockWithThreads, StackNonCooperativeSpinLock) {
+ SpinLock spinlock(base_internal::SCHEDULE_KERNEL_ONLY);
+ ThreadedTest(&spinlock);
+}
+
+TEST(SpinLockWithThreads, StaticCooperativeSpinLock) {
+ ThreadedTest(&static_cooperative_spinlock);
+}
+
+TEST(SpinLockWithThreads, StaticNonCooperativeSpinLock) {
+ ThreadedTest(&static_noncooperative_spinlock);
+}
+
+TEST(SpinLockWithThreads, DoesNotDeadlock) {
+ struct Helper {
+ static void NotifyThenLock(Notification* locked, SpinLock* spinlock,
+ BlockingCounter* b) {
+ locked->WaitForNotification(); // Wait for LockThenWait() to hold "s".
+ b->DecrementCount();
+ SpinLockHolder l(spinlock);
+ }
+
+ static void LockThenWait(Notification* locked, SpinLock* spinlock,
+ BlockingCounter* b) {
+ SpinLockHolder l(spinlock);
+ locked->Notify();
+ b->Wait();
+ }
+
+ static void DeadlockTest(SpinLock* spinlock, int num_spinners) {
+ Notification locked;
+ BlockingCounter counter(num_spinners);
+ std::vector<std::thread> threads;
+
+ threads.push_back(
+ std::thread(Helper::LockThenWait, &locked, spinlock, &counter));
+ for (int i = 0; i < num_spinners; ++i) {
+ threads.push_back(
+ std::thread(Helper::NotifyThenLock, &locked, spinlock, &counter));
+ }
+
+ for (auto& thread : threads) {
+ thread.join();
+ }
+ }
+ };
+
+ SpinLock stack_cooperative_spinlock(
+ base_internal::SCHEDULE_COOPERATIVE_AND_KERNEL);
+ SpinLock stack_noncooperative_spinlock(base_internal::SCHEDULE_KERNEL_ONLY);
+ Helper::DeadlockTest(&stack_cooperative_spinlock,
+ base_internal::NumCPUs() * 2);
+ Helper::DeadlockTest(&stack_noncooperative_spinlock,
+ base_internal::NumCPUs() * 2);
+ Helper::DeadlockTest(&static_cooperative_spinlock,
+ base_internal::NumCPUs() * 2);
+ Helper::DeadlockTest(&static_noncooperative_spinlock,
+ base_internal::NumCPUs() * 2);
+}
+
+} // namespace
+} // namespace base_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/base/thread_annotations.h b/third_party/abseil/src/absl/base/thread_annotations.h
new file mode 100644
index 0000000..e23fff1
--- /dev/null
+++ b/third_party/abseil/src/absl/base/thread_annotations.h
@@ -0,0 +1,335 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: thread_annotations.h
+// -----------------------------------------------------------------------------
+//
+// This header file contains macro definitions for thread safety annotations
+// that allow developers to document the locking policies of multi-threaded
+// code. The annotations can also help program analysis tools to identify
+// potential thread safety issues.
+//
+// These annotations are implemented using compiler attributes. Using the macros
+// defined here instead of raw attributes allow for portability and future
+// compatibility.
+//
+// When referring to mutexes in the arguments of the attributes, you should
+// use variable names or more complex expressions (e.g. my_object->mutex_)
+// that evaluate to a concrete mutex object whenever possible. If the mutex
+// you want to refer to is not in scope, you may use a member pointer
+// (e.g. &MyClass::mutex_) to refer to a mutex in some (unknown) object.
+
+#ifndef ABSL_BASE_THREAD_ANNOTATIONS_H_
+#define ABSL_BASE_THREAD_ANNOTATIONS_H_
+
+#include "absl/base/attributes.h"
+#include "absl/base/config.h"
+// TODO(mbonadei): Remove after the backward compatibility period.
+#include "absl/base/internal/thread_annotations.h" // IWYU pragma: export
+
+// ABSL_GUARDED_BY()
+//
+// Documents if a shared field or global variable needs to be protected by a
+// mutex. ABSL_GUARDED_BY() allows the user to specify a particular mutex that
+// should be held when accessing the annotated variable.
+//
+// Although this annotation (and ABSL_PT_GUARDED_BY, below) cannot be applied to
+// local variables, a local variable and its associated mutex can often be
+// combined into a small class or struct, thereby allowing the annotation.
+//
+// Example:
+//
+// class Foo {
+// Mutex mu_;
+// int p1_ ABSL_GUARDED_BY(mu_);
+// ...
+// };
+#if ABSL_HAVE_ATTRIBUTE(guarded_by)
+#define ABSL_GUARDED_BY(x) __attribute__((guarded_by(x)))
+#else
+#define ABSL_GUARDED_BY(x)
+#endif
+
+// ABSL_PT_GUARDED_BY()
+//
+// Documents if the memory location pointed to by a pointer should be guarded
+// by a mutex when dereferencing the pointer.
+//
+// Example:
+// class Foo {
+// Mutex mu_;
+// int *p1_ ABSL_PT_GUARDED_BY(mu_);
+// ...
+// };
+//
+// Note that a pointer variable to a shared memory location could itself be a
+// shared variable.
+//
+// Example:
+//
+// // `q_`, guarded by `mu1_`, points to a shared memory location that is
+// // guarded by `mu2_`:
+// int *q_ ABSL_GUARDED_BY(mu1_) ABSL_PT_GUARDED_BY(mu2_);
+#if ABSL_HAVE_ATTRIBUTE(pt_guarded_by)
+#define ABSL_PT_GUARDED_BY(x) __attribute__((pt_guarded_by(x)))
+#else
+#define ABSL_PT_GUARDED_BY(x)
+#endif
+
+// ABSL_ACQUIRED_AFTER() / ABSL_ACQUIRED_BEFORE()
+//
+// Documents the acquisition order between locks that can be held
+// simultaneously by a thread. For any two locks that need to be annotated
+// to establish an acquisition order, only one of them needs the annotation.
+// (i.e. You don't have to annotate both locks with both ABSL_ACQUIRED_AFTER
+// and ABSL_ACQUIRED_BEFORE.)
+//
+// As with ABSL_GUARDED_BY, this is only applicable to mutexes that are shared
+// fields or global variables.
+//
+// Example:
+//
+// Mutex m1_;
+// Mutex m2_ ABSL_ACQUIRED_AFTER(m1_);
+#if ABSL_HAVE_ATTRIBUTE(acquired_after)
+#define ABSL_ACQUIRED_AFTER(...) __attribute__((acquired_after(__VA_ARGS__)))
+#else
+#define ABSL_ACQUIRED_AFTER(...)
+#endif
+
+#if ABSL_HAVE_ATTRIBUTE(acquired_before)
+#define ABSL_ACQUIRED_BEFORE(...) __attribute__((acquired_before(__VA_ARGS__)))
+#else
+#define ABSL_ACQUIRED_BEFORE(...)
+#endif
+
+// ABSL_EXCLUSIVE_LOCKS_REQUIRED() / ABSL_SHARED_LOCKS_REQUIRED()
+//
+// Documents a function that expects a mutex to be held prior to entry.
+// The mutex is expected to be held both on entry to, and exit from, the
+// function.
+//
+// An exclusive lock allows read-write access to the guarded data member(s), and
+// only one thread can acquire a lock exclusively at any one time. A shared lock
+// allows read-only access, and any number of threads can acquire a shared lock
+// concurrently.
+//
+// Generally, non-const methods should be annotated with
+// ABSL_EXCLUSIVE_LOCKS_REQUIRED, while const methods should be annotated with
+// ABSL_SHARED_LOCKS_REQUIRED.
+//
+// Example:
+//
+// Mutex mu1, mu2;
+// int a ABSL_GUARDED_BY(mu1);
+// int b ABSL_GUARDED_BY(mu2);
+//
+// void foo() ABSL_EXCLUSIVE_LOCKS_REQUIRED(mu1, mu2) { ... }
+// void bar() const ABSL_SHARED_LOCKS_REQUIRED(mu1, mu2) { ... }
+#if ABSL_HAVE_ATTRIBUTE(exclusive_locks_required)
+#define ABSL_EXCLUSIVE_LOCKS_REQUIRED(...) \
+ __attribute__((exclusive_locks_required(__VA_ARGS__)))
+#else
+#define ABSL_EXCLUSIVE_LOCKS_REQUIRED(...)
+#endif
+
+#if ABSL_HAVE_ATTRIBUTE(shared_locks_required)
+#define ABSL_SHARED_LOCKS_REQUIRED(...) \
+ __attribute__((shared_locks_required(__VA_ARGS__)))
+#else
+#define ABSL_SHARED_LOCKS_REQUIRED(...)
+#endif
+
+// ABSL_LOCKS_EXCLUDED()
+//
+// Documents the locks acquired in the body of the function. These locks
+// cannot be held when calling this function (as Abseil's `Mutex` locks are
+// non-reentrant).
+#if ABSL_HAVE_ATTRIBUTE(locks_excluded)
+#define ABSL_LOCKS_EXCLUDED(...) __attribute__((locks_excluded(__VA_ARGS__)))
+#else
+#define ABSL_LOCKS_EXCLUDED(...)
+#endif
+
+// ABSL_LOCK_RETURNED()
+//
+// Documents a function that returns a mutex without acquiring it. For example,
+// a public getter method that returns a pointer to a private mutex should
+// be annotated with ABSL_LOCK_RETURNED.
+#if ABSL_HAVE_ATTRIBUTE(lock_returned)
+#define ABSL_LOCK_RETURNED(x) __attribute__((lock_returned(x)))
+#else
+#define ABSL_LOCK_RETURNED(x)
+#endif
+
+// ABSL_LOCKABLE
+//
+// Documents if a class/type is a lockable type (such as the `Mutex` class).
+#if ABSL_HAVE_ATTRIBUTE(lockable)
+#define ABSL_LOCKABLE __attribute__((lockable))
+#else
+#define ABSL_LOCKABLE
+#endif
+
+// ABSL_SCOPED_LOCKABLE
+//
+// Documents if a class does RAII locking (such as the `MutexLock` class).
+// The constructor should use `LOCK_FUNCTION()` to specify the mutex that is
+// acquired, and the destructor should use `UNLOCK_FUNCTION()` with no
+// arguments; the analysis will assume that the destructor unlocks whatever the
+// constructor locked.
+#if ABSL_HAVE_ATTRIBUTE(scoped_lockable)
+#define ABSL_SCOPED_LOCKABLE __attribute__((scoped_lockable))
+#else
+#define ABSL_SCOPED_LOCKABLE
+#endif
+
+// ABSL_EXCLUSIVE_LOCK_FUNCTION()
+//
+// Documents functions that acquire a lock in the body of a function, and do
+// not release it.
+#if ABSL_HAVE_ATTRIBUTE(exclusive_lock_function)
+#define ABSL_EXCLUSIVE_LOCK_FUNCTION(...) \
+ __attribute__((exclusive_lock_function(__VA_ARGS__)))
+#else
+#define ABSL_EXCLUSIVE_LOCK_FUNCTION(...)
+#endif
+
+// ABSL_SHARED_LOCK_FUNCTION()
+//
+// Documents functions that acquire a shared (reader) lock in the body of a
+// function, and do not release it.
+#if ABSL_HAVE_ATTRIBUTE(shared_lock_function)
+#define ABSL_SHARED_LOCK_FUNCTION(...) \
+ __attribute__((shared_lock_function(__VA_ARGS__)))
+#else
+#define ABSL_SHARED_LOCK_FUNCTION(...)
+#endif
+
+// ABSL_UNLOCK_FUNCTION()
+//
+// Documents functions that expect a lock to be held on entry to the function,
+// and release it in the body of the function.
+#if ABSL_HAVE_ATTRIBUTE(unlock_function)
+#define ABSL_UNLOCK_FUNCTION(...) __attribute__((unlock_function(__VA_ARGS__)))
+#else
+#define ABSL_UNLOCK_FUNCTION(...)
+#endif
+
+// ABSL_EXCLUSIVE_TRYLOCK_FUNCTION() / ABSL_SHARED_TRYLOCK_FUNCTION()
+//
+// Documents functions that try to acquire a lock, and return success or failure
+// (or a non-boolean value that can be interpreted as a boolean).
+// The first argument should be `true` for functions that return `true` on
+// success, or `false` for functions that return `false` on success. The second
+// argument specifies the mutex that is locked on success. If unspecified, this
+// mutex is assumed to be `this`.
+#if ABSL_HAVE_ATTRIBUTE(exclusive_trylock_function)
+#define ABSL_EXCLUSIVE_TRYLOCK_FUNCTION(...) \
+ __attribute__((exclusive_trylock_function(__VA_ARGS__)))
+#else
+#define ABSL_EXCLUSIVE_TRYLOCK_FUNCTION(...)
+#endif
+
+#if ABSL_HAVE_ATTRIBUTE(shared_trylock_function)
+#define ABSL_SHARED_TRYLOCK_FUNCTION(...) \
+ __attribute__((shared_trylock_function(__VA_ARGS__)))
+#else
+#define ABSL_SHARED_TRYLOCK_FUNCTION(...)
+#endif
+
+// ABSL_ASSERT_EXCLUSIVE_LOCK() / ABSL_ASSERT_SHARED_LOCK()
+//
+// Documents functions that dynamically check to see if a lock is held, and fail
+// if it is not held.
+#if ABSL_HAVE_ATTRIBUTE(assert_exclusive_lock)
+#define ABSL_ASSERT_EXCLUSIVE_LOCK(...) \
+ __attribute__((assert_exclusive_lock(__VA_ARGS__)))
+#else
+#define ABSL_ASSERT_EXCLUSIVE_LOCK(...)
+#endif
+
+#if ABSL_HAVE_ATTRIBUTE(assert_shared_lock)
+#define ABSL_ASSERT_SHARED_LOCK(...) \
+ __attribute__((assert_shared_lock(__VA_ARGS__)))
+#else
+#define ABSL_ASSERT_SHARED_LOCK(...)
+#endif
+
+// ABSL_NO_THREAD_SAFETY_ANALYSIS
+//
+// Turns off thread safety checking within the body of a particular function.
+// This annotation is used to mark functions that are known to be correct, but
+// the locking behavior is more complicated than the analyzer can handle.
+#if ABSL_HAVE_ATTRIBUTE(no_thread_safety_analysis)
+#define ABSL_NO_THREAD_SAFETY_ANALYSIS \
+ __attribute__((no_thread_safety_analysis))
+#else
+#define ABSL_NO_THREAD_SAFETY_ANALYSIS
+#endif
+
+//------------------------------------------------------------------------------
+// Tool-Supplied Annotations
+//------------------------------------------------------------------------------
+
+// ABSL_TS_UNCHECKED should be placed around lock expressions that are not valid
+// C++ syntax, but which are present for documentation purposes. These
+// annotations will be ignored by the analysis.
+#define ABSL_TS_UNCHECKED(x) ""
+
+// ABSL_TS_FIXME is used to mark lock expressions that are not valid C++ syntax.
+// It is used by automated tools to mark and disable invalid expressions.
+// The annotation should either be fixed, or changed to ABSL_TS_UNCHECKED.
+#define ABSL_TS_FIXME(x) ""
+
+// Like ABSL_NO_THREAD_SAFETY_ANALYSIS, this turns off checking within the body
+// of a particular function. However, this attribute is used to mark functions
+// that are incorrect and need to be fixed. It is used by automated tools to
+// avoid breaking the build when the analysis is updated.
+// Code owners are expected to eventually fix the routine.
+#define ABSL_NO_THREAD_SAFETY_ANALYSIS_FIXME ABSL_NO_THREAD_SAFETY_ANALYSIS
+
+// Similar to ABSL_NO_THREAD_SAFETY_ANALYSIS_FIXME, this macro marks a
+// ABSL_GUARDED_BY annotation that needs to be fixed, because it is producing
+// thread safety warning. It disables the ABSL_GUARDED_BY.
+#define ABSL_GUARDED_BY_FIXME(x)
+
+// Disables warnings for a single read operation. This can be used to avoid
+// warnings when it is known that the read is not actually involved in a race,
+// but the compiler cannot confirm that.
+#define ABSL_TS_UNCHECKED_READ(x) absl::base_internal::ts_unchecked_read(x)
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace base_internal {
+
+// Takes a reference to a guarded data member, and returns an unguarded
+// reference.
+// Do not used this function directly, use ABSL_TS_UNCHECKED_READ instead.
+template <typename T>
+inline const T& ts_unchecked_read(const T& v) ABSL_NO_THREAD_SAFETY_ANALYSIS {
+ return v;
+}
+
+template <typename T>
+inline T& ts_unchecked_read(T& v) ABSL_NO_THREAD_SAFETY_ANALYSIS {
+ return v;
+}
+
+} // namespace base_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_BASE_THREAD_ANNOTATIONS_H_
diff --git a/third_party/abseil/src/absl/base/throw_delegate_test.cc b/third_party/abseil/src/absl/base/throw_delegate_test.cc
new file mode 100644
index 0000000..5ba4ce5
--- /dev/null
+++ b/third_party/abseil/src/absl/base/throw_delegate_test.cc
@@ -0,0 +1,107 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/base/internal/throw_delegate.h"
+
+#include <functional>
+#include <new>
+#include <stdexcept>
+
+#include "absl/base/config.h"
+#include "gtest/gtest.h"
+
+namespace {
+
+using absl::base_internal::ThrowStdLogicError;
+using absl::base_internal::ThrowStdInvalidArgument;
+using absl::base_internal::ThrowStdDomainError;
+using absl::base_internal::ThrowStdLengthError;
+using absl::base_internal::ThrowStdOutOfRange;
+using absl::base_internal::ThrowStdRuntimeError;
+using absl::base_internal::ThrowStdRangeError;
+using absl::base_internal::ThrowStdOverflowError;
+using absl::base_internal::ThrowStdUnderflowError;
+using absl::base_internal::ThrowStdBadFunctionCall;
+using absl::base_internal::ThrowStdBadAlloc;
+
+constexpr const char* what_arg = "The quick brown fox jumps over the lazy dog";
+
+template <typename E>
+void ExpectThrowChar(void (*f)(const char*)) {
+#ifdef ABSL_HAVE_EXCEPTIONS
+ try {
+ f(what_arg);
+ FAIL() << "Didn't throw";
+ } catch (const E& e) {
+ EXPECT_STREQ(e.what(), what_arg);
+ }
+#else
+ EXPECT_DEATH_IF_SUPPORTED(f(what_arg), what_arg);
+#endif
+}
+
+template <typename E>
+void ExpectThrowString(void (*f)(const std::string&)) {
+#ifdef ABSL_HAVE_EXCEPTIONS
+ try {
+ f(what_arg);
+ FAIL() << "Didn't throw";
+ } catch (const E& e) {
+ EXPECT_STREQ(e.what(), what_arg);
+ }
+#else
+ EXPECT_DEATH_IF_SUPPORTED(f(what_arg), what_arg);
+#endif
+}
+
+template <typename E>
+void ExpectThrowNoWhat(void (*f)()) {
+#ifdef ABSL_HAVE_EXCEPTIONS
+ try {
+ f();
+ FAIL() << "Didn't throw";
+ } catch (const E& e) {
+ }
+#else
+ EXPECT_DEATH_IF_SUPPORTED(f(), "");
+#endif
+}
+
+TEST(ThrowHelper, Test) {
+ // Not using EXPECT_THROW because we want to check the .what() message too.
+ ExpectThrowChar<std::logic_error>(ThrowStdLogicError);
+ ExpectThrowChar<std::invalid_argument>(ThrowStdInvalidArgument);
+ ExpectThrowChar<std::domain_error>(ThrowStdDomainError);
+ ExpectThrowChar<std::length_error>(ThrowStdLengthError);
+ ExpectThrowChar<std::out_of_range>(ThrowStdOutOfRange);
+ ExpectThrowChar<std::runtime_error>(ThrowStdRuntimeError);
+ ExpectThrowChar<std::range_error>(ThrowStdRangeError);
+ ExpectThrowChar<std::overflow_error>(ThrowStdOverflowError);
+ ExpectThrowChar<std::underflow_error>(ThrowStdUnderflowError);
+
+ ExpectThrowString<std::logic_error>(ThrowStdLogicError);
+ ExpectThrowString<std::invalid_argument>(ThrowStdInvalidArgument);
+ ExpectThrowString<std::domain_error>(ThrowStdDomainError);
+ ExpectThrowString<std::length_error>(ThrowStdLengthError);
+ ExpectThrowString<std::out_of_range>(ThrowStdOutOfRange);
+ ExpectThrowString<std::runtime_error>(ThrowStdRuntimeError);
+ ExpectThrowString<std::range_error>(ThrowStdRangeError);
+ ExpectThrowString<std::overflow_error>(ThrowStdOverflowError);
+ ExpectThrowString<std::underflow_error>(ThrowStdUnderflowError);
+
+ ExpectThrowNoWhat<std::bad_function_call>(ThrowStdBadFunctionCall);
+ ExpectThrowNoWhat<std::bad_alloc>(ThrowStdBadAlloc);
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/container/BUILD.bazel b/third_party/abseil/src/absl/container/BUILD.bazel
new file mode 100644
index 0000000..8e72ad0
--- /dev/null
+++ b/third_party/abseil/src/absl/container/BUILD.bazel
@@ -0,0 +1,921 @@
+#
+# Copyright 2017 The Abseil Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+load("@rules_cc//cc:defs.bzl", "cc_binary", "cc_library", "cc_test")
+load(
+ "//absl:copts/configure_copts.bzl",
+ "ABSL_DEFAULT_COPTS",
+ "ABSL_DEFAULT_LINKOPTS",
+ "ABSL_TEST_COPTS",
+)
+
+package(default_visibility = ["//visibility:public"])
+
+licenses(["notice"])
+
+cc_library(
+ name = "compressed_tuple",
+ hdrs = ["internal/compressed_tuple.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ "//absl/utility",
+ ],
+)
+
+cc_test(
+ name = "compressed_tuple_test",
+ srcs = ["internal/compressed_tuple_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":compressed_tuple",
+ ":test_instance_tracker",
+ "//absl/memory",
+ "//absl/types:any",
+ "//absl/types:optional",
+ "//absl/utility",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_library(
+ name = "fixed_array",
+ hdrs = ["fixed_array.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":compressed_tuple",
+ "//absl/algorithm",
+ "//absl/base:config",
+ "//absl/base:core_headers",
+ "//absl/base:dynamic_annotations",
+ "//absl/base:throw_delegate",
+ "//absl/memory",
+ ],
+)
+
+cc_test(
+ name = "fixed_array_test",
+ srcs = ["fixed_array_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":counting_allocator",
+ ":fixed_array",
+ "//absl/base:config",
+ "//absl/base:exception_testing",
+ "//absl/hash:hash_testing",
+ "//absl/memory",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "fixed_array_exception_safety_test",
+ srcs = ["fixed_array_exception_safety_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":fixed_array",
+ "//absl/base:config",
+ "//absl/base:exception_safety_testing",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "fixed_array_benchmark",
+ srcs = ["fixed_array_benchmark.cc"],
+ copts = ABSL_TEST_COPTS + ["$(STACK_FRAME_UNLIMITED)"],
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ tags = ["benchmark"],
+ deps = [
+ ":fixed_array",
+ "@com_github_google_benchmark//:benchmark_main",
+ ],
+)
+
+cc_library(
+ name = "inlined_vector_internal",
+ hdrs = ["internal/inlined_vector.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":compressed_tuple",
+ "//absl/base:core_headers",
+ "//absl/memory",
+ "//absl/meta:type_traits",
+ "//absl/types:span",
+ ],
+)
+
+cc_library(
+ name = "inlined_vector",
+ hdrs = ["inlined_vector.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":inlined_vector_internal",
+ "//absl/algorithm",
+ "//absl/base:core_headers",
+ "//absl/base:throw_delegate",
+ "//absl/memory",
+ ],
+)
+
+cc_library(
+ name = "counting_allocator",
+ testonly = 1,
+ hdrs = ["internal/counting_allocator.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ visibility = ["//visibility:private"],
+ deps = ["//absl/base:config"],
+)
+
+cc_test(
+ name = "inlined_vector_test",
+ srcs = ["inlined_vector_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":counting_allocator",
+ ":inlined_vector",
+ ":test_instance_tracker",
+ "//absl/base:config",
+ "//absl/base:core_headers",
+ "//absl/base:exception_testing",
+ "//absl/base:raw_logging_internal",
+ "//absl/hash:hash_testing",
+ "//absl/memory",
+ "//absl/strings",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "inlined_vector_benchmark",
+ srcs = ["inlined_vector_benchmark.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ tags = ["benchmark"],
+ deps = [
+ ":inlined_vector",
+ "//absl/base:core_headers",
+ "//absl/base:raw_logging_internal",
+ "//absl/strings",
+ "@com_github_google_benchmark//:benchmark_main",
+ ],
+)
+
+cc_test(
+ name = "inlined_vector_exception_safety_test",
+ srcs = ["inlined_vector_exception_safety_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ deps = [
+ ":inlined_vector",
+ "//absl/base:config",
+ "//absl/base:exception_safety_testing",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_library(
+ name = "test_instance_tracker",
+ testonly = 1,
+ srcs = ["internal/test_instance_tracker.cc"],
+ hdrs = ["internal/test_instance_tracker.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ visibility = [
+ "//absl:__subpackages__",
+ ],
+ deps = ["//absl/types:compare"],
+)
+
+cc_test(
+ name = "test_instance_tracker_test",
+ srcs = ["internal/test_instance_tracker_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":test_instance_tracker",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+NOTEST_TAGS_NONMOBILE = [
+ "no_test_darwin_x86_64",
+ "no_test_loonix",
+]
+
+NOTEST_TAGS_MOBILE = [
+ "no_test_android_arm",
+ "no_test_android_arm64",
+ "no_test_android_x86",
+ "no_test_ios_x86_64",
+]
+
+NOTEST_TAGS = NOTEST_TAGS_MOBILE + NOTEST_TAGS_NONMOBILE
+
+cc_library(
+ name = "flat_hash_map",
+ hdrs = ["flat_hash_map.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":container_memory",
+ ":hash_function_defaults",
+ ":raw_hash_map",
+ "//absl/algorithm:container",
+ "//absl/memory",
+ ],
+)
+
+cc_test(
+ name = "flat_hash_map_test",
+ srcs = ["flat_hash_map_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ tags = NOTEST_TAGS_NONMOBILE,
+ deps = [
+ ":flat_hash_map",
+ ":hash_generator_testing",
+ ":unordered_map_constructor_test",
+ ":unordered_map_lookup_test",
+ ":unordered_map_members_test",
+ ":unordered_map_modifiers_test",
+ "//absl/base:raw_logging_internal",
+ "//absl/types:any",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_library(
+ name = "flat_hash_set",
+ hdrs = ["flat_hash_set.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":container_memory",
+ ":hash_function_defaults",
+ ":raw_hash_set",
+ "//absl/algorithm:container",
+ "//absl/base:core_headers",
+ "//absl/memory",
+ ],
+)
+
+cc_test(
+ name = "flat_hash_set_test",
+ srcs = ["flat_hash_set_test.cc"],
+ copts = ABSL_TEST_COPTS + ["-DUNORDERED_SET_CXX17"],
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ tags = NOTEST_TAGS_NONMOBILE,
+ deps = [
+ ":flat_hash_set",
+ ":hash_generator_testing",
+ ":unordered_set_constructor_test",
+ ":unordered_set_lookup_test",
+ ":unordered_set_members_test",
+ ":unordered_set_modifiers_test",
+ "//absl/base:raw_logging_internal",
+ "//absl/memory",
+ "//absl/strings",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_library(
+ name = "node_hash_map",
+ hdrs = ["node_hash_map.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":container_memory",
+ ":hash_function_defaults",
+ ":node_hash_policy",
+ ":raw_hash_map",
+ "//absl/algorithm:container",
+ "//absl/memory",
+ ],
+)
+
+cc_test(
+ name = "node_hash_map_test",
+ srcs = ["node_hash_map_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ tags = NOTEST_TAGS_NONMOBILE,
+ deps = [
+ ":hash_generator_testing",
+ ":node_hash_map",
+ ":tracked",
+ ":unordered_map_constructor_test",
+ ":unordered_map_lookup_test",
+ ":unordered_map_members_test",
+ ":unordered_map_modifiers_test",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_library(
+ name = "node_hash_set",
+ hdrs = ["node_hash_set.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":hash_function_defaults",
+ ":node_hash_policy",
+ ":raw_hash_set",
+ "//absl/algorithm:container",
+ "//absl/memory",
+ ],
+)
+
+cc_test(
+ name = "node_hash_set_test",
+ srcs = ["node_hash_set_test.cc"],
+ copts = ABSL_TEST_COPTS + ["-DUNORDERED_SET_CXX17"],
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ tags = NOTEST_TAGS_NONMOBILE,
+ deps = [
+ ":node_hash_set",
+ ":unordered_set_constructor_test",
+ ":unordered_set_lookup_test",
+ ":unordered_set_members_test",
+ ":unordered_set_modifiers_test",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_library(
+ name = "container_memory",
+ hdrs = ["internal/container_memory.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ "//absl/base:config",
+ "//absl/memory",
+ "//absl/meta:type_traits",
+ "//absl/utility",
+ ],
+)
+
+cc_test(
+ name = "container_memory_test",
+ srcs = ["internal/container_memory_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ tags = NOTEST_TAGS_NONMOBILE,
+ deps = [
+ ":container_memory",
+ ":test_instance_tracker",
+ "//absl/strings",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_library(
+ name = "hash_function_defaults",
+ hdrs = ["internal/hash_function_defaults.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ "//absl/base:config",
+ "//absl/hash",
+ "//absl/strings",
+ "//absl/strings:cord",
+ ],
+)
+
+cc_test(
+ name = "hash_function_defaults_test",
+ srcs = ["internal/hash_function_defaults_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ tags = NOTEST_TAGS,
+ deps = [
+ ":hash_function_defaults",
+ "//absl/hash",
+ "//absl/random",
+ "//absl/strings",
+ "//absl/strings:cord",
+ "//absl/strings:cord_test_helpers",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_library(
+ name = "hash_generator_testing",
+ testonly = 1,
+ srcs = ["internal/hash_generator_testing.cc"],
+ hdrs = ["internal/hash_generator_testing.h"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":hash_policy_testing",
+ "//absl/memory",
+ "//absl/meta:type_traits",
+ "//absl/strings",
+ ],
+)
+
+cc_library(
+ name = "hash_policy_testing",
+ testonly = 1,
+ hdrs = ["internal/hash_policy_testing.h"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ "//absl/hash",
+ "//absl/strings",
+ ],
+)
+
+cc_test(
+ name = "hash_policy_testing_test",
+ srcs = ["internal/hash_policy_testing_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":hash_policy_testing",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_library(
+ name = "hash_policy_traits",
+ hdrs = ["internal/hash_policy_traits.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = ["//absl/meta:type_traits"],
+)
+
+cc_test(
+ name = "hash_policy_traits_test",
+ srcs = ["internal/hash_policy_traits_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":hash_policy_traits",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_library(
+ name = "hashtable_debug",
+ hdrs = ["internal/hashtable_debug.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":hashtable_debug_hooks",
+ ],
+)
+
+cc_library(
+ name = "hashtable_debug_hooks",
+ hdrs = ["internal/hashtable_debug_hooks.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ "//absl/base:config",
+ ],
+)
+
+cc_library(
+ name = "hashtablez_sampler",
+ srcs = [
+ "internal/hashtablez_sampler.cc",
+ "internal/hashtablez_sampler_force_weak_definition.cc",
+ ],
+ hdrs = ["internal/hashtablez_sampler.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":have_sse",
+ "//absl/base",
+ "//absl/base:core_headers",
+ "//absl/base:exponential_biased",
+ "//absl/debugging:stacktrace",
+ "//absl/memory",
+ "//absl/synchronization",
+ "//absl/utility",
+ ],
+)
+
+cc_test(
+ name = "hashtablez_sampler_test",
+ srcs = ["internal/hashtablez_sampler_test.cc"],
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":hashtablez_sampler",
+ ":have_sse",
+ "//absl/base:core_headers",
+ "//absl/synchronization",
+ "//absl/synchronization:thread_pool",
+ "//absl/time",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_library(
+ name = "node_hash_policy",
+ hdrs = ["internal/node_hash_policy.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = ["//absl/base:config"],
+)
+
+cc_test(
+ name = "node_hash_policy_test",
+ srcs = ["internal/node_hash_policy_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":hash_policy_traits",
+ ":node_hash_policy",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_library(
+ name = "raw_hash_map",
+ hdrs = ["internal/raw_hash_map.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":container_memory",
+ ":raw_hash_set",
+ "//absl/base:throw_delegate",
+ ],
+)
+
+cc_library(
+ name = "have_sse",
+ hdrs = ["internal/have_sse.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ visibility = ["//visibility:private"],
+)
+
+cc_library(
+ name = "common",
+ hdrs = ["internal/common.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ "//absl/meta:type_traits",
+ "//absl/types:optional",
+ ],
+)
+
+cc_library(
+ name = "raw_hash_set",
+ srcs = ["internal/raw_hash_set.cc"],
+ hdrs = ["internal/raw_hash_set.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":common",
+ ":compressed_tuple",
+ ":container_memory",
+ ":hash_policy_traits",
+ ":hashtable_debug_hooks",
+ ":hashtablez_sampler",
+ ":have_sse",
+ ":layout",
+ "//absl/base:bits",
+ "//absl/base:config",
+ "//absl/base:core_headers",
+ "//absl/base:endian",
+ "//absl/memory",
+ "//absl/meta:type_traits",
+ "//absl/utility",
+ ],
+)
+
+cc_test(
+ name = "raw_hash_set_test",
+ srcs = ["internal/raw_hash_set_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkstatic = 1,
+ tags = NOTEST_TAGS,
+ deps = [
+ ":container_memory",
+ ":hash_function_defaults",
+ ":hash_policy_testing",
+ ":hashtable_debug",
+ ":raw_hash_set",
+ "//absl/base",
+ "//absl/base:config",
+ "//absl/base:core_headers",
+ "//absl/base:raw_logging_internal",
+ "//absl/strings",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "raw_hash_set_allocator_test",
+ size = "small",
+ srcs = ["internal/raw_hash_set_allocator_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":raw_hash_set",
+ ":tracked",
+ "//absl/base:core_headers",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_library(
+ name = "layout",
+ hdrs = ["internal/layout.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ "//absl/base:config",
+ "//absl/base:core_headers",
+ "//absl/meta:type_traits",
+ "//absl/strings",
+ "//absl/types:span",
+ "//absl/utility",
+ ],
+)
+
+cc_test(
+ name = "layout_test",
+ size = "small",
+ srcs = ["internal/layout_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ tags = NOTEST_TAGS,
+ visibility = ["//visibility:private"],
+ deps = [
+ ":layout",
+ "//absl/base:config",
+ "//absl/base:core_headers",
+ "//absl/base:raw_logging_internal",
+ "//absl/types:span",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_library(
+ name = "tracked",
+ testonly = 1,
+ hdrs = ["internal/tracked.h"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ "//absl/base:config",
+ ],
+)
+
+cc_library(
+ name = "unordered_map_constructor_test",
+ testonly = 1,
+ hdrs = ["internal/unordered_map_constructor_test.h"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":hash_generator_testing",
+ ":hash_policy_testing",
+ "@com_google_googletest//:gtest",
+ ],
+)
+
+cc_library(
+ name = "unordered_map_lookup_test",
+ testonly = 1,
+ hdrs = ["internal/unordered_map_lookup_test.h"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":hash_generator_testing",
+ ":hash_policy_testing",
+ "@com_google_googletest//:gtest",
+ ],
+)
+
+cc_library(
+ name = "unordered_map_modifiers_test",
+ testonly = 1,
+ hdrs = ["internal/unordered_map_modifiers_test.h"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":hash_generator_testing",
+ ":hash_policy_testing",
+ "@com_google_googletest//:gtest",
+ ],
+)
+
+cc_library(
+ name = "unordered_set_constructor_test",
+ testonly = 1,
+ hdrs = ["internal/unordered_set_constructor_test.h"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":hash_generator_testing",
+ ":hash_policy_testing",
+ "//absl/meta:type_traits",
+ "@com_google_googletest//:gtest",
+ ],
+)
+
+cc_library(
+ name = "unordered_set_members_test",
+ testonly = 1,
+ hdrs = ["internal/unordered_set_members_test.h"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ "//absl/meta:type_traits",
+ "@com_google_googletest//:gtest",
+ ],
+)
+
+cc_library(
+ name = "unordered_map_members_test",
+ testonly = 1,
+ hdrs = ["internal/unordered_map_members_test.h"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ "//absl/meta:type_traits",
+ "@com_google_googletest//:gtest",
+ ],
+)
+
+cc_library(
+ name = "unordered_set_lookup_test",
+ testonly = 1,
+ hdrs = ["internal/unordered_set_lookup_test.h"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":hash_generator_testing",
+ ":hash_policy_testing",
+ "@com_google_googletest//:gtest",
+ ],
+)
+
+cc_library(
+ name = "unordered_set_modifiers_test",
+ testonly = 1,
+ hdrs = ["internal/unordered_set_modifiers_test.h"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":hash_generator_testing",
+ ":hash_policy_testing",
+ "@com_google_googletest//:gtest",
+ ],
+)
+
+cc_test(
+ name = "unordered_set_test",
+ srcs = ["internal/unordered_set_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ tags = NOTEST_TAGS_NONMOBILE,
+ deps = [
+ ":unordered_set_constructor_test",
+ ":unordered_set_lookup_test",
+ ":unordered_set_members_test",
+ ":unordered_set_modifiers_test",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "unordered_map_test",
+ srcs = ["internal/unordered_map_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ tags = NOTEST_TAGS_NONMOBILE,
+ deps = [
+ ":unordered_map_constructor_test",
+ ":unordered_map_lookup_test",
+ ":unordered_map_members_test",
+ ":unordered_map_modifiers_test",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_library(
+ name = "btree",
+ srcs = [
+ "internal/btree.h",
+ "internal/btree_container.h",
+ ],
+ hdrs = [
+ "btree_map.h",
+ "btree_set.h",
+ ],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ visibility = ["//visibility:public"],
+ deps = [
+ ":common",
+ ":compressed_tuple",
+ ":container_memory",
+ ":layout",
+ "//absl/base:core_headers",
+ "//absl/base:throw_delegate",
+ "//absl/memory",
+ "//absl/meta:type_traits",
+ "//absl/strings",
+ "//absl/strings:cord",
+ "//absl/types:compare",
+ "//absl/utility",
+ ],
+)
+
+cc_library(
+ name = "btree_test_common",
+ testonly = 1,
+ hdrs = ["btree_test.h"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ visibility = ["//visibility:private"],
+ deps = [
+ ":btree",
+ ":flat_hash_set",
+ "//absl/strings",
+ "//absl/strings:cord",
+ "//absl/time",
+ ],
+)
+
+cc_test(
+ name = "btree_test",
+ size = "large",
+ srcs = [
+ "btree_test.cc",
+ ],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ shard_count = 10,
+ visibility = ["//visibility:private"],
+ deps = [
+ ":btree",
+ ":btree_test_common",
+ ":counting_allocator",
+ ":test_instance_tracker",
+ "//absl/base:core_headers",
+ "//absl/base:raw_logging_internal",
+ "//absl/flags:flag",
+ "//absl/hash:hash_testing",
+ "//absl/memory",
+ "//absl/meta:type_traits",
+ "//absl/strings",
+ "//absl/types:compare",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_binary(
+ name = "btree_benchmark",
+ testonly = 1,
+ srcs = [
+ "btree_benchmark.cc",
+ ],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ tags = ["benchmark"],
+ visibility = ["//visibility:private"],
+ deps = [
+ ":btree",
+ ":btree_test_common",
+ ":flat_hash_map",
+ ":flat_hash_set",
+ ":hashtable_debug",
+ "//absl/base:raw_logging_internal",
+ "//absl/flags:flag",
+ "//absl/hash",
+ "//absl/memory",
+ "//absl/strings:cord",
+ "//absl/strings:str_format",
+ "//absl/time",
+ "@com_github_google_benchmark//:benchmark_main",
+ ],
+)
diff --git a/third_party/abseil/src/absl/container/CMakeLists.txt b/third_party/abseil/src/absl/container/CMakeLists.txt
new file mode 100644
index 0000000..eb202c4
--- /dev/null
+++ b/third_party/abseil/src/absl/container/CMakeLists.txt
@@ -0,0 +1,905 @@
+#
+# Copyright 2017 The Abseil Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+# This is deprecated and will be removed in the future. It also doesn't do
+# anything anyways. Prefer to use the library associated with the API you are
+# using.
+absl_cc_library(
+ NAME
+ container
+ PUBLIC
+)
+
+absl_cc_library(
+ NAME
+ btree
+ HDRS
+ "btree_map.h"
+ "btree_set.h"
+ "internal/btree.h"
+ "internal/btree_container.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::container_common
+ absl::compare
+ absl::compressed_tuple
+ absl::container_memory
+ absl::cord
+ absl::core_headers
+ absl::layout
+ absl::memory
+ absl::strings
+ absl::throw_delegate
+ absl::type_traits
+ absl::utility
+)
+
+absl_cc_library(
+ NAME
+ btree_test_common
+ hdrs
+ "btree_test.h"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::btree
+ absl::cord
+ absl::flat_hash_set
+ absl::strings
+ absl::time
+ TESTONLY
+)
+
+absl_cc_test(
+ NAME
+ btree_test
+ SRCS
+ "btree_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::btree
+ absl::btree_test_common
+ absl::compare
+ absl::core_headers
+ absl::counting_allocator
+ absl::flags
+ absl::hash_testing
+ absl::raw_logging_internal
+ absl::strings
+ absl::test_instance_tracker
+ absl::type_traits
+ gmock_main
+)
+
+absl_cc_library(
+ NAME
+ compressed_tuple
+ HDRS
+ "internal/compressed_tuple.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::utility
+ PUBLIC
+)
+
+absl_cc_test(
+ NAME
+ compressed_tuple_test
+ SRCS
+ "internal/compressed_tuple_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::any
+ absl::compressed_tuple
+ absl::memory
+ absl::optional
+ absl::test_instance_tracker
+ absl::utility
+ gmock_main
+)
+
+absl_cc_library(
+ NAME
+ fixed_array
+ HDRS
+ "fixed_array.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::compressed_tuple
+ absl::algorithm
+ absl::config
+ absl::core_headers
+ absl::dynamic_annotations
+ absl::throw_delegate
+ absl::memory
+ PUBLIC
+)
+
+absl_cc_test(
+ NAME
+ fixed_array_test
+ SRCS
+ "fixed_array_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::fixed_array
+ absl::counting_allocator
+ absl::config
+ absl::exception_testing
+ absl::hash_testing
+ absl::memory
+ gmock_main
+)
+
+absl_cc_test(
+ NAME
+ fixed_array_exception_safety_test
+ SRCS
+ "fixed_array_exception_safety_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::fixed_array
+ absl::config
+ absl::exception_safety_testing
+ gmock_main
+)
+
+absl_cc_library(
+ NAME
+ inlined_vector_internal
+ HDRS
+ "internal/inlined_vector.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::compressed_tuple
+ absl::core_headers
+ absl::memory
+ absl::span
+ absl::type_traits
+ PUBLIC
+)
+
+absl_cc_library(
+ NAME
+ inlined_vector
+ HDRS
+ "inlined_vector.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::algorithm
+ absl::core_headers
+ absl::inlined_vector_internal
+ absl::throw_delegate
+ absl::memory
+ PUBLIC
+)
+
+absl_cc_library(
+ NAME
+ counting_allocator
+ HDRS
+ "internal/counting_allocator.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::config
+)
+
+absl_cc_test(
+ NAME
+ inlined_vector_test
+ SRCS
+ "inlined_vector_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::counting_allocator
+ absl::inlined_vector
+ absl::test_instance_tracker
+ absl::config
+ absl::core_headers
+ absl::exception_testing
+ absl::hash_testing
+ absl::memory
+ absl::raw_logging_internal
+ absl::strings
+ gmock_main
+)
+
+absl_cc_test(
+ NAME
+ inlined_vector_exception_safety_test
+ SRCS
+ "inlined_vector_exception_safety_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::inlined_vector
+ absl::config
+ absl::exception_safety_testing
+ gmock_main
+)
+
+absl_cc_library(
+ NAME
+ test_instance_tracker
+ HDRS
+ "internal/test_instance_tracker.h"
+ SRCS
+ "internal/test_instance_tracker.cc"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::compare
+ TESTONLY
+)
+
+absl_cc_test(
+ NAME
+ test_instance_tracker_test
+ SRCS
+ "internal/test_instance_tracker_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::test_instance_tracker
+ gmock_main
+)
+
+absl_cc_library(
+ NAME
+ flat_hash_map
+ HDRS
+ "flat_hash_map.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::container_memory
+ absl::hash_function_defaults
+ absl::raw_hash_map
+ absl::algorithm_container
+ absl::memory
+ PUBLIC
+)
+
+absl_cc_test(
+ NAME
+ flat_hash_map_test
+ SRCS
+ "flat_hash_map_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::flat_hash_map
+ absl::hash_generator_testing
+ absl::unordered_map_constructor_test
+ absl::unordered_map_lookup_test
+ absl::unordered_map_members_test
+ absl::unordered_map_modifiers_test
+ absl::any
+ absl::raw_logging_internal
+ gmock_main
+)
+
+absl_cc_library(
+ NAME
+ flat_hash_set
+ HDRS
+ "flat_hash_set.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::container_memory
+ absl::hash_function_defaults
+ absl::raw_hash_set
+ absl::algorithm_container
+ absl::core_headers
+ absl::memory
+ PUBLIC
+)
+
+absl_cc_test(
+ NAME
+ flat_hash_set_test
+ SRCS
+ "flat_hash_set_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ "-DUNORDERED_SET_CXX17"
+ DEPS
+ absl::flat_hash_set
+ absl::hash_generator_testing
+ absl::unordered_set_constructor_test
+ absl::unordered_set_lookup_test
+ absl::unordered_set_members_test
+ absl::unordered_set_modifiers_test
+ absl::memory
+ absl::raw_logging_internal
+ absl::strings
+ gmock_main
+)
+
+absl_cc_library(
+ NAME
+ node_hash_map
+ HDRS
+ "node_hash_map.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::container_memory
+ absl::hash_function_defaults
+ absl::node_hash_policy
+ absl::raw_hash_map
+ absl::algorithm_container
+ absl::memory
+ PUBLIC
+)
+
+absl_cc_test(
+ NAME
+ node_hash_map_test
+ SRCS
+ "node_hash_map_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::hash_generator_testing
+ absl::node_hash_map
+ absl::tracked
+ absl::unordered_map_constructor_test
+ absl::unordered_map_lookup_test
+ absl::unordered_map_members_test
+ absl::unordered_map_modifiers_test
+ gmock_main
+)
+
+absl_cc_library(
+ NAME
+ node_hash_set
+ HDRS
+ "node_hash_set.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::hash_function_defaults
+ absl::node_hash_policy
+ absl::raw_hash_set
+ absl::algorithm_container
+ absl::memory
+ PUBLIC
+)
+
+absl_cc_test(
+ NAME
+ node_hash_set_test
+ SRCS
+ "node_hash_set_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ "-DUNORDERED_SET_CXX17"
+ DEPS
+ absl::hash_generator_testing
+ absl::node_hash_set
+ absl::unordered_set_constructor_test
+ absl::unordered_set_lookup_test
+ absl::unordered_set_members_test
+ absl::unordered_set_modifiers_test
+ gmock_main
+)
+
+absl_cc_library(
+ NAME
+ container_memory
+ HDRS
+ "internal/container_memory.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::config
+ absl::memory
+ absl::type_traits
+ absl::utility
+ PUBLIC
+)
+
+absl_cc_test(
+ NAME
+ container_memory_test
+ SRCS
+ "internal/container_memory_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::container_memory
+ absl::strings
+ absl::test_instance_tracker
+ gmock_main
+)
+
+absl_cc_library(
+ NAME
+ hash_function_defaults
+ HDRS
+ "internal/hash_function_defaults.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::config
+ absl::cord
+ absl::hash
+ absl::strings
+ PUBLIC
+)
+
+absl_cc_test(
+ NAME
+ hash_function_defaults_test
+ SRCS
+ "internal/hash_function_defaults_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::cord
+ absl::cord_test_helpers
+ absl::hash_function_defaults
+ absl::hash
+ absl::random_random
+ absl::strings
+ gmock_main
+)
+
+absl_cc_library(
+ NAME
+ hash_generator_testing
+ HDRS
+ "internal/hash_generator_testing.h"
+ SRCS
+ "internal/hash_generator_testing.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::hash_policy_testing
+ absl::memory
+ absl::meta
+ absl::strings
+ TESTONLY
+)
+
+absl_cc_library(
+ NAME
+ hash_policy_testing
+ HDRS
+ "internal/hash_policy_testing.h"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::hash
+ absl::strings
+ TESTONLY
+)
+
+absl_cc_test(
+ NAME
+ hash_policy_testing_test
+ SRCS
+ "internal/hash_policy_testing_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::hash_policy_testing
+ gmock_main
+)
+
+absl_cc_library(
+ NAME
+ hash_policy_traits
+ HDRS
+ "internal/hash_policy_traits.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::meta
+ PUBLIC
+)
+
+absl_cc_test(
+ NAME
+ hash_policy_traits_test
+ SRCS
+ "internal/hash_policy_traits_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::hash_policy_traits
+ gmock_main
+)
+
+absl_cc_library(
+ NAME
+ hashtablez_sampler
+ HDRS
+ "internal/hashtablez_sampler.h"
+ SRCS
+ "internal/hashtablez_sampler.cc"
+ "internal/hashtablez_sampler_force_weak_definition.cc"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::base
+ absl::exponential_biased
+ absl::have_sse
+ absl::synchronization
+)
+
+absl_cc_test(
+ NAME
+ hashtablez_sampler_test
+ SRCS
+ "internal/hashtablez_sampler_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::hashtablez_sampler
+ absl::have_sse
+ gmock_main
+)
+
+absl_cc_library(
+ NAME
+ hashtable_debug
+ HDRS
+ "internal/hashtable_debug.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::hashtable_debug_hooks
+)
+
+absl_cc_library(
+ NAME
+ hashtable_debug_hooks
+ HDRS
+ "internal/hashtable_debug_hooks.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::config
+ PUBLIC
+)
+
+absl_cc_library(
+ NAME
+ have_sse
+ HDRS
+ "internal/have_sse.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+)
+
+absl_cc_library(
+ NAME
+ node_hash_policy
+ HDRS
+ "internal/node_hash_policy.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::config
+ PUBLIC
+)
+
+absl_cc_test(
+ NAME
+ node_hash_policy_test
+ SRCS
+ "internal/node_hash_policy_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::hash_policy_traits
+ absl::node_hash_policy
+ gmock_main
+)
+
+absl_cc_library(
+ NAME
+ raw_hash_map
+ HDRS
+ "internal/raw_hash_map.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::container_memory
+ absl::raw_hash_set
+ absl::throw_delegate
+ PUBLIC
+)
+
+absl_cc_library(
+ NAME
+ container_common
+ HDRS
+ "internal/common.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::type_traits
+)
+
+absl_cc_library(
+ NAME
+ raw_hash_set
+ HDRS
+ "internal/raw_hash_set.h"
+ SRCS
+ "internal/raw_hash_set.cc"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::bits
+ absl::compressed_tuple
+ absl::config
+ absl::container_common
+ absl::container_memory
+ absl::core_headers
+ absl::endian
+ absl::hash_policy_traits
+ absl::hashtable_debug_hooks
+ absl::have_sse
+ absl::layout
+ absl::memory
+ absl::meta
+ absl::optional
+ absl::utility
+ absl::hashtablez_sampler
+ PUBLIC
+)
+
+absl_cc_test(
+ NAME
+ raw_hash_set_test
+ SRCS
+ "internal/raw_hash_set_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::container_memory
+ absl::hash_function_defaults
+ absl::hash_policy_testing
+ absl::hashtable_debug
+ absl::raw_hash_set
+ absl::base
+ absl::config
+ absl::core_headers
+ absl::raw_logging_internal
+ absl::strings
+ gmock_main
+)
+
+absl_cc_test(
+ NAME
+ raw_hash_set_allocator_test
+ SRCS
+ "internal/raw_hash_set_allocator_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::raw_hash_set
+ absl::tracked
+ absl::core_headers
+ gmock_main
+)
+
+absl_cc_library(
+ NAME
+ layout
+ HDRS
+ "internal/layout.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::config
+ absl::core_headers
+ absl::meta
+ absl::strings
+ absl::span
+ absl::utility
+ PUBLIC
+)
+
+absl_cc_test(
+ NAME
+ layout_test
+ SRCS
+ "internal/layout_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::layout
+ absl::config
+ absl::core_headers
+ absl::raw_logging_internal
+ absl::span
+ gmock_main
+)
+
+absl_cc_library(
+ NAME
+ tracked
+ HDRS
+ "internal/tracked.h"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::config
+ TESTONLY
+)
+
+absl_cc_library(
+ NAME
+ unordered_map_constructor_test
+ HDRS
+ "internal/unordered_map_constructor_test.h"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::hash_generator_testing
+ absl::hash_policy_testing
+ gmock
+ TESTONLY
+)
+
+absl_cc_library(
+ NAME
+ unordered_map_lookup_test
+ HDRS
+ "internal/unordered_map_lookup_test.h"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::hash_generator_testing
+ absl::hash_policy_testing
+ gmock
+ TESTONLY
+)
+
+absl_cc_library(
+ NAME
+ unordered_map_members_test
+ HDRS
+ "internal/unordered_map_members_test.h"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::type_traits
+ gmock
+ TESTONLY
+)
+
+absl_cc_library(
+ NAME
+ unordered_map_modifiers_test
+ HDRS
+ "internal/unordered_map_modifiers_test.h"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::hash_generator_testing
+ absl::hash_policy_testing
+ gmock
+ TESTONLY
+)
+
+absl_cc_library(
+ NAME
+ unordered_set_constructor_test
+ HDRS
+ "internal/unordered_set_constructor_test.h"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::hash_generator_testing
+ absl::hash_policy_testing
+ gmock
+ TESTONLY
+)
+
+absl_cc_library(
+ NAME
+ unordered_set_lookup_test
+ HDRS
+ "internal/unordered_set_lookup_test.h"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::hash_generator_testing
+ absl::hash_policy_testing
+ gmock
+ TESTONLY
+)
+
+absl_cc_library(
+ NAME
+ unordered_set_members_test
+ HDRS
+ "internal/unordered_set_members_test.h"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::type_traits
+ gmock
+ TESTONLY
+)
+
+absl_cc_library(
+ NAME
+ unordered_set_modifiers_test
+ HDRS
+ "internal/unordered_set_modifiers_test.h"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::hash_generator_testing
+ absl::hash_policy_testing
+ gmock
+ TESTONLY
+)
+
+absl_cc_test(
+ NAME
+ unordered_set_test
+ SRCS
+ "internal/unordered_set_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::unordered_set_constructor_test
+ absl::unordered_set_lookup_test
+ absl::unordered_set_members_test
+ absl::unordered_set_modifiers_test
+ gmock_main
+)
+
+absl_cc_test(
+ NAME
+ unordered_map_test
+ SRCS
+ "internal/unordered_map_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::unordered_map_constructor_test
+ absl::unordered_map_lookup_test
+ absl::unordered_map_members_test
+ absl::unordered_map_modifiers_test
+ gmock_main
+)
diff --git a/third_party/abseil/src/absl/container/btree_benchmark.cc b/third_party/abseil/src/absl/container/btree_benchmark.cc
new file mode 100644
index 0000000..4679867
--- /dev/null
+++ b/third_party/abseil/src/absl/container/btree_benchmark.cc
@@ -0,0 +1,735 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <stdint.h>
+
+#include <algorithm>
+#include <functional>
+#include <map>
+#include <numeric>
+#include <random>
+#include <set>
+#include <string>
+#include <type_traits>
+#include <unordered_map>
+#include <unordered_set>
+#include <vector>
+
+#include "absl/base/internal/raw_logging.h"
+#include "absl/container/btree_map.h"
+#include "absl/container/btree_set.h"
+#include "absl/container/btree_test.h"
+#include "absl/container/flat_hash_map.h"
+#include "absl/container/flat_hash_set.h"
+#include "absl/container/internal/hashtable_debug.h"
+#include "absl/flags/flag.h"
+#include "absl/hash/hash.h"
+#include "absl/memory/memory.h"
+#include "absl/strings/cord.h"
+#include "absl/strings/str_format.h"
+#include "absl/time/time.h"
+#include "benchmark/benchmark.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace container_internal {
+namespace {
+
+constexpr size_t kBenchmarkValues = 1 << 20;
+
+// How many times we add and remove sub-batches in one batch of *AddRem
+// benchmarks.
+constexpr size_t kAddRemBatchSize = 1 << 2;
+
+// Generates n values in the range [0, 4 * n].
+template <typename V>
+std::vector<V> GenerateValues(int n) {
+ constexpr int kSeed = 23;
+ return GenerateValuesWithSeed<V>(n, 4 * n, kSeed);
+}
+
+// Benchmark insertion of values into a container.
+template <typename T>
+void BM_InsertImpl(benchmark::State& state, bool sorted) {
+ using V = typename remove_pair_const<typename T::value_type>::type;
+ typename KeyOfValue<typename T::key_type, V>::type key_of_value;
+
+ std::vector<V> values = GenerateValues<V>(kBenchmarkValues);
+ if (sorted) {
+ std::sort(values.begin(), values.end());
+ }
+ T container(values.begin(), values.end());
+
+ // Remove and re-insert 10% of the keys per batch.
+ const int batch_size = (kBenchmarkValues + 9) / 10;
+ while (state.KeepRunningBatch(batch_size)) {
+ state.PauseTiming();
+ const auto i = static_cast<int>(state.iterations());
+
+ for (int j = i; j < i + batch_size; j++) {
+ int x = j % kBenchmarkValues;
+ container.erase(key_of_value(values[x]));
+ }
+
+ state.ResumeTiming();
+
+ for (int j = i; j < i + batch_size; j++) {
+ int x = j % kBenchmarkValues;
+ container.insert(values[x]);
+ }
+ }
+}
+
+template <typename T>
+void BM_Insert(benchmark::State& state) {
+ BM_InsertImpl<T>(state, false);
+}
+
+template <typename T>
+void BM_InsertSorted(benchmark::State& state) {
+ BM_InsertImpl<T>(state, true);
+}
+
+// container::insert sometimes returns a pair<iterator, bool> and sometimes
+// returns an iterator (for multi- containers).
+template <typename Iter>
+Iter GetIterFromInsert(const std::pair<Iter, bool>& pair) {
+ return pair.first;
+}
+template <typename Iter>
+Iter GetIterFromInsert(const Iter iter) {
+ return iter;
+}
+
+// Benchmark insertion of values into a container at the end.
+template <typename T>
+void BM_InsertEnd(benchmark::State& state) {
+ using V = typename remove_pair_const<typename T::value_type>::type;
+ typename KeyOfValue<typename T::key_type, V>::type key_of_value;
+
+ T container;
+ const int kSize = 10000;
+ for (int i = 0; i < kSize; ++i) {
+ container.insert(Generator<V>(kSize)(i));
+ }
+ V v = Generator<V>(kSize)(kSize - 1);
+ typename T::key_type k = key_of_value(v);
+
+ auto it = container.find(k);
+ while (state.KeepRunning()) {
+ // Repeatedly removing then adding v.
+ container.erase(it);
+ it = GetIterFromInsert(container.insert(v));
+ }
+}
+
+// Benchmark inserting the first few elements in a container. In b-tree, this is
+// when the root node grows.
+template <typename T>
+void BM_InsertSmall(benchmark::State& state) {
+ using V = typename remove_pair_const<typename T::value_type>::type;
+
+ const int kSize = 8;
+ std::vector<V> values = GenerateValues<V>(kSize);
+ T container;
+
+ while (state.KeepRunningBatch(kSize)) {
+ for (int i = 0; i < kSize; ++i) {
+ benchmark::DoNotOptimize(container.insert(values[i]));
+ }
+ state.PauseTiming();
+ // Do not measure the time it takes to clear the container.
+ container.clear();
+ state.ResumeTiming();
+ }
+}
+
+template <typename T>
+void BM_LookupImpl(benchmark::State& state, bool sorted) {
+ using V = typename remove_pair_const<typename T::value_type>::type;
+ typename KeyOfValue<typename T::key_type, V>::type key_of_value;
+
+ std::vector<V> values = GenerateValues<V>(kBenchmarkValues);
+ if (sorted) {
+ std::sort(values.begin(), values.end());
+ }
+ T container(values.begin(), values.end());
+
+ while (state.KeepRunning()) {
+ int idx = state.iterations() % kBenchmarkValues;
+ benchmark::DoNotOptimize(container.find(key_of_value(values[idx])));
+ }
+}
+
+// Benchmark lookup of values in a container.
+template <typename T>
+void BM_Lookup(benchmark::State& state) {
+ BM_LookupImpl<T>(state, false);
+}
+
+// Benchmark lookup of values in a full container, meaning that values
+// are inserted in-order to take advantage of biased insertion, which
+// yields a full tree.
+template <typename T>
+void BM_FullLookup(benchmark::State& state) {
+ BM_LookupImpl<T>(state, true);
+}
+
+// Benchmark deletion of values from a container.
+template <typename T>
+void BM_Delete(benchmark::State& state) {
+ using V = typename remove_pair_const<typename T::value_type>::type;
+ typename KeyOfValue<typename T::key_type, V>::type key_of_value;
+ std::vector<V> values = GenerateValues<V>(kBenchmarkValues);
+ T container(values.begin(), values.end());
+
+ // Remove and re-insert 10% of the keys per batch.
+ const int batch_size = (kBenchmarkValues + 9) / 10;
+ while (state.KeepRunningBatch(batch_size)) {
+ const int i = state.iterations();
+
+ for (int j = i; j < i + batch_size; j++) {
+ int x = j % kBenchmarkValues;
+ container.erase(key_of_value(values[x]));
+ }
+
+ state.PauseTiming();
+ for (int j = i; j < i + batch_size; j++) {
+ int x = j % kBenchmarkValues;
+ container.insert(values[x]);
+ }
+ state.ResumeTiming();
+ }
+}
+
+// Benchmark deletion of multiple values from a container.
+template <typename T>
+void BM_DeleteRange(benchmark::State& state) {
+ using V = typename remove_pair_const<typename T::value_type>::type;
+ typename KeyOfValue<typename T::key_type, V>::type key_of_value;
+ std::vector<V> values = GenerateValues<V>(kBenchmarkValues);
+ T container(values.begin(), values.end());
+
+ // Remove and re-insert 10% of the keys per batch.
+ const int batch_size = (kBenchmarkValues + 9) / 10;
+ while (state.KeepRunningBatch(batch_size)) {
+ const int i = state.iterations();
+
+ const int start_index = i % kBenchmarkValues;
+
+ state.PauseTiming();
+ {
+ std::vector<V> removed;
+ removed.reserve(batch_size);
+ auto itr = container.find(key_of_value(values[start_index]));
+ auto start = itr;
+ for (int j = 0; j < batch_size; j++) {
+ if (itr == container.end()) {
+ state.ResumeTiming();
+ container.erase(start, itr);
+ state.PauseTiming();
+ itr = container.begin();
+ start = itr;
+ }
+ removed.push_back(*itr++);
+ }
+
+ state.ResumeTiming();
+ container.erase(start, itr);
+ state.PauseTiming();
+
+ container.insert(removed.begin(), removed.end());
+ }
+ state.ResumeTiming();
+ }
+}
+
+// Benchmark steady-state insert (into first half of range) and remove (from
+// second half of range), treating the container approximately like a queue with
+// log-time access for all elements. This benchmark does not test the case where
+// insertion and removal happen in the same region of the tree. This benchmark
+// counts two value constructors.
+template <typename T>
+void BM_QueueAddRem(benchmark::State& state) {
+ using V = typename remove_pair_const<typename T::value_type>::type;
+ typename KeyOfValue<typename T::key_type, V>::type key_of_value;
+
+ ABSL_RAW_CHECK(kBenchmarkValues % 2 == 0, "for performance");
+
+ T container;
+
+ const size_t half = kBenchmarkValues / 2;
+ std::vector<int> remove_keys(half);
+ std::vector<int> add_keys(half);
+
+ // We want to do the exact same work repeatedly, and the benchmark can end
+ // after a different number of iterations depending on the speed of the
+ // individual run so we use a large batch size here and ensure that we do
+ // deterministic work every batch.
+ while (state.KeepRunningBatch(half * kAddRemBatchSize)) {
+ state.PauseTiming();
+
+ container.clear();
+
+ for (size_t i = 0; i < half; ++i) {
+ remove_keys[i] = i;
+ add_keys[i] = i;
+ }
+ constexpr int kSeed = 5;
+ std::mt19937_64 rand(kSeed);
+ std::shuffle(remove_keys.begin(), remove_keys.end(), rand);
+ std::shuffle(add_keys.begin(), add_keys.end(), rand);
+
+ // Note needs lazy generation of values.
+ Generator<V> g(kBenchmarkValues * kAddRemBatchSize);
+
+ for (size_t i = 0; i < half; ++i) {
+ container.insert(g(add_keys[i]));
+ container.insert(g(half + remove_keys[i]));
+ }
+
+ // There are three parts each of size "half":
+ // 1 is being deleted from [offset - half, offset)
+ // 2 is standing [offset, offset + half)
+ // 3 is being inserted into [offset + half, offset + 2 * half)
+ size_t offset = 0;
+
+ for (size_t i = 0; i < kAddRemBatchSize; ++i) {
+ std::shuffle(remove_keys.begin(), remove_keys.end(), rand);
+ std::shuffle(add_keys.begin(), add_keys.end(), rand);
+ offset += half;
+
+ state.ResumeTiming();
+ for (size_t idx = 0; idx < half; ++idx) {
+ container.erase(key_of_value(g(offset - half + remove_keys[idx])));
+ container.insert(g(offset + half + add_keys[idx]));
+ }
+ state.PauseTiming();
+ }
+ state.ResumeTiming();
+ }
+}
+
+// Mixed insertion and deletion in the same range using pre-constructed values.
+template <typename T>
+void BM_MixedAddRem(benchmark::State& state) {
+ using V = typename remove_pair_const<typename T::value_type>::type;
+ typename KeyOfValue<typename T::key_type, V>::type key_of_value;
+
+ ABSL_RAW_CHECK(kBenchmarkValues % 2 == 0, "for performance");
+
+ T container;
+
+ // Create two random shuffles
+ std::vector<int> remove_keys(kBenchmarkValues);
+ std::vector<int> add_keys(kBenchmarkValues);
+
+ // We want to do the exact same work repeatedly, and the benchmark can end
+ // after a different number of iterations depending on the speed of the
+ // individual run so we use a large batch size here and ensure that we do
+ // deterministic work every batch.
+ while (state.KeepRunningBatch(kBenchmarkValues * kAddRemBatchSize)) {
+ state.PauseTiming();
+
+ container.clear();
+
+ constexpr int kSeed = 7;
+ std::mt19937_64 rand(kSeed);
+
+ std::vector<V> values = GenerateValues<V>(kBenchmarkValues * 2);
+
+ // Insert the first half of the values (already in random order)
+ container.insert(values.begin(), values.begin() + kBenchmarkValues);
+
+ // Insert the first half of the values (already in random order)
+ for (size_t i = 0; i < kBenchmarkValues; ++i) {
+ // remove_keys and add_keys will be swapped before each round,
+ // therefore fill add_keys here w/ the keys being inserted, so
+ // they'll be the first to be removed.
+ remove_keys[i] = i + kBenchmarkValues;
+ add_keys[i] = i;
+ }
+
+ for (size_t i = 0; i < kAddRemBatchSize; ++i) {
+ remove_keys.swap(add_keys);
+ std::shuffle(remove_keys.begin(), remove_keys.end(), rand);
+ std::shuffle(add_keys.begin(), add_keys.end(), rand);
+
+ state.ResumeTiming();
+ for (size_t idx = 0; idx < kBenchmarkValues; ++idx) {
+ container.erase(key_of_value(values[remove_keys[idx]]));
+ container.insert(values[add_keys[idx]]);
+ }
+ state.PauseTiming();
+ }
+ state.ResumeTiming();
+ }
+}
+
+// Insertion at end, removal from the beginning. This benchmark
+// counts two value constructors.
+// TODO(ezb): we could add a GenerateNext version of generator that could reduce
+// noise for string-like types.
+template <typename T>
+void BM_Fifo(benchmark::State& state) {
+ using V = typename remove_pair_const<typename T::value_type>::type;
+
+ T container;
+ // Need lazy generation of values as state.max_iterations is large.
+ Generator<V> g(kBenchmarkValues + state.max_iterations);
+
+ for (int i = 0; i < kBenchmarkValues; i++) {
+ container.insert(g(i));
+ }
+
+ while (state.KeepRunning()) {
+ container.erase(container.begin());
+ container.insert(container.end(), g(state.iterations() + kBenchmarkValues));
+ }
+}
+
+// Iteration (forward) through the tree
+template <typename T>
+void BM_FwdIter(benchmark::State& state) {
+ using V = typename remove_pair_const<typename T::value_type>::type;
+ using R = typename T::value_type const*;
+
+ std::vector<V> values = GenerateValues<V>(kBenchmarkValues);
+ T container(values.begin(), values.end());
+
+ auto iter = container.end();
+
+ R r = nullptr;
+
+ while (state.KeepRunning()) {
+ if (iter == container.end()) iter = container.begin();
+ r = &(*iter);
+ ++iter;
+ }
+
+ benchmark::DoNotOptimize(r);
+}
+
+// Benchmark random range-construction of a container.
+template <typename T>
+void BM_RangeConstructionImpl(benchmark::State& state, bool sorted) {
+ using V = typename remove_pair_const<typename T::value_type>::type;
+
+ std::vector<V> values = GenerateValues<V>(kBenchmarkValues);
+ if (sorted) {
+ std::sort(values.begin(), values.end());
+ }
+ {
+ T container(values.begin(), values.end());
+ }
+
+ while (state.KeepRunning()) {
+ T container(values.begin(), values.end());
+ benchmark::DoNotOptimize(container);
+ }
+}
+
+template <typename T>
+void BM_InsertRangeRandom(benchmark::State& state) {
+ BM_RangeConstructionImpl<T>(state, false);
+}
+
+template <typename T>
+void BM_InsertRangeSorted(benchmark::State& state) {
+ BM_RangeConstructionImpl<T>(state, true);
+}
+
+#define STL_ORDERED_TYPES(value) \
+ using stl_set_##value = std::set<value>; \
+ using stl_map_##value = std::map<value, intptr_t>; \
+ using stl_multiset_##value = std::multiset<value>; \
+ using stl_multimap_##value = std::multimap<value, intptr_t>
+
+using StdString = std::string;
+STL_ORDERED_TYPES(int32_t);
+STL_ORDERED_TYPES(int64_t);
+STL_ORDERED_TYPES(StdString);
+STL_ORDERED_TYPES(Cord);
+STL_ORDERED_TYPES(Time);
+
+#define STL_UNORDERED_TYPES(value) \
+ using stl_unordered_set_##value = std::unordered_set<value>; \
+ using stl_unordered_map_##value = std::unordered_map<value, intptr_t>; \
+ using flat_hash_set_##value = flat_hash_set<value>; \
+ using flat_hash_map_##value = flat_hash_map<value, intptr_t>; \
+ using stl_unordered_multiset_##value = std::unordered_multiset<value>; \
+ using stl_unordered_multimap_##value = \
+ std::unordered_multimap<value, intptr_t>
+
+#define STL_UNORDERED_TYPES_CUSTOM_HASH(value, hash) \
+ using stl_unordered_set_##value = std::unordered_set<value, hash>; \
+ using stl_unordered_map_##value = std::unordered_map<value, intptr_t, hash>; \
+ using flat_hash_set_##value = flat_hash_set<value, hash>; \
+ using flat_hash_map_##value = flat_hash_map<value, intptr_t, hash>; \
+ using stl_unordered_multiset_##value = std::unordered_multiset<value, hash>; \
+ using stl_unordered_multimap_##value = \
+ std::unordered_multimap<value, intptr_t, hash>
+
+STL_UNORDERED_TYPES_CUSTOM_HASH(Cord, absl::Hash<absl::Cord>);
+
+STL_UNORDERED_TYPES(int32_t);
+STL_UNORDERED_TYPES(int64_t);
+STL_UNORDERED_TYPES(StdString);
+STL_UNORDERED_TYPES_CUSTOM_HASH(Time, absl::Hash<absl::Time>);
+
+#define BTREE_TYPES(value) \
+ using btree_256_set_##value = \
+ btree_set<value, std::less<value>, std::allocator<value>>; \
+ using btree_256_map_##value = \
+ btree_map<value, intptr_t, std::less<value>, \
+ std::allocator<std::pair<const value, intptr_t>>>; \
+ using btree_256_multiset_##value = \
+ btree_multiset<value, std::less<value>, std::allocator<value>>; \
+ using btree_256_multimap_##value = \
+ btree_multimap<value, intptr_t, std::less<value>, \
+ std::allocator<std::pair<const value, intptr_t>>>
+
+BTREE_TYPES(int32_t);
+BTREE_TYPES(int64_t);
+BTREE_TYPES(StdString);
+BTREE_TYPES(Cord);
+BTREE_TYPES(Time);
+
+#define MY_BENCHMARK4(type, func) \
+ void BM_##type##_##func(benchmark::State& state) { BM_##func<type>(state); } \
+ BENCHMARK(BM_##type##_##func)
+
+#define MY_BENCHMARK3(type) \
+ MY_BENCHMARK4(type, Insert); \
+ MY_BENCHMARK4(type, InsertSorted); \
+ MY_BENCHMARK4(type, InsertEnd); \
+ MY_BENCHMARK4(type, InsertSmall); \
+ MY_BENCHMARK4(type, Lookup); \
+ MY_BENCHMARK4(type, FullLookup); \
+ MY_BENCHMARK4(type, Delete); \
+ MY_BENCHMARK4(type, DeleteRange); \
+ MY_BENCHMARK4(type, QueueAddRem); \
+ MY_BENCHMARK4(type, MixedAddRem); \
+ MY_BENCHMARK4(type, Fifo); \
+ MY_BENCHMARK4(type, FwdIter); \
+ MY_BENCHMARK4(type, InsertRangeRandom); \
+ MY_BENCHMARK4(type, InsertRangeSorted)
+
+#define MY_BENCHMARK2_SUPPORTS_MULTI_ONLY(type) \
+ MY_BENCHMARK3(stl_##type); \
+ MY_BENCHMARK3(stl_unordered_##type); \
+ MY_BENCHMARK3(btree_256_##type)
+
+#define MY_BENCHMARK2(type) \
+ MY_BENCHMARK2_SUPPORTS_MULTI_ONLY(type); \
+ MY_BENCHMARK3(flat_hash_##type)
+
+// Define MULTI_TESTING to see benchmarks for multi-containers also.
+//
+// You can use --copt=-DMULTI_TESTING.
+#ifdef MULTI_TESTING
+#define MY_BENCHMARK(type) \
+ MY_BENCHMARK2(set_##type); \
+ MY_BENCHMARK2(map_##type); \
+ MY_BENCHMARK2_SUPPORTS_MULTI_ONLY(multiset_##type); \
+ MY_BENCHMARK2_SUPPORTS_MULTI_ONLY(multimap_##type)
+#else
+#define MY_BENCHMARK(type) \
+ MY_BENCHMARK2(set_##type); \
+ MY_BENCHMARK2(map_##type)
+#endif
+
+MY_BENCHMARK(int32_t);
+MY_BENCHMARK(int64_t);
+MY_BENCHMARK(StdString);
+MY_BENCHMARK(Cord);
+MY_BENCHMARK(Time);
+
+// Define a type whose size and cost of moving are independently customizable.
+// When sizeof(value_type) increases, we expect btree to no longer have as much
+// cache-locality advantage over STL. When cost of moving increases, we expect
+// btree to actually do more work than STL because it has to move values around
+// and STL doesn't have to.
+template <int Size, int Copies>
+struct BigType {
+ BigType() : BigType(0) {}
+ explicit BigType(int x) { std::iota(values.begin(), values.end(), x); }
+
+ void Copy(const BigType& other) {
+ for (int i = 0; i < Size && i < Copies; ++i) values[i] = other.values[i];
+ // If Copies > Size, do extra copies.
+ for (int i = Size, idx = 0; i < Copies; ++i) {
+ int64_t tmp = other.values[idx];
+ benchmark::DoNotOptimize(tmp);
+ idx = idx + 1 == Size ? 0 : idx + 1;
+ }
+ }
+
+ BigType(const BigType& other) { Copy(other); }
+ BigType& operator=(const BigType& other) {
+ Copy(other);
+ return *this;
+ }
+
+ // Compare only the first Copies elements if Copies is less than Size.
+ bool operator<(const BigType& other) const {
+ return std::lexicographical_compare(
+ values.begin(), values.begin() + std::min(Size, Copies),
+ other.values.begin(), other.values.begin() + std::min(Size, Copies));
+ }
+ bool operator==(const BigType& other) const {
+ return std::equal(values.begin(), values.begin() + std::min(Size, Copies),
+ other.values.begin());
+ }
+
+ // Support absl::Hash.
+ template <typename State>
+ friend State AbslHashValue(State h, const BigType& b) {
+ for (int i = 0; i < Size && i < Copies; ++i)
+ h = State::combine(std::move(h), b.values[i]);
+ return h;
+ }
+
+ std::array<int64_t, Size> values;
+};
+
+#define BIG_TYPE_BENCHMARKS(SIZE, COPIES) \
+ using stl_set_size##SIZE##copies##COPIES = std::set<BigType<SIZE, COPIES>>; \
+ using stl_map_size##SIZE##copies##COPIES = \
+ std::map<BigType<SIZE, COPIES>, intptr_t>; \
+ using stl_multiset_size##SIZE##copies##COPIES = \
+ std::multiset<BigType<SIZE, COPIES>>; \
+ using stl_multimap_size##SIZE##copies##COPIES = \
+ std::multimap<BigType<SIZE, COPIES>, intptr_t>; \
+ using stl_unordered_set_size##SIZE##copies##COPIES = \
+ std::unordered_set<BigType<SIZE, COPIES>, \
+ absl::Hash<BigType<SIZE, COPIES>>>; \
+ using stl_unordered_map_size##SIZE##copies##COPIES = \
+ std::unordered_map<BigType<SIZE, COPIES>, intptr_t, \
+ absl::Hash<BigType<SIZE, COPIES>>>; \
+ using flat_hash_set_size##SIZE##copies##COPIES = \
+ flat_hash_set<BigType<SIZE, COPIES>>; \
+ using flat_hash_map_size##SIZE##copies##COPIES = \
+ flat_hash_map<BigType<SIZE, COPIES>, intptr_t>; \
+ using stl_unordered_multiset_size##SIZE##copies##COPIES = \
+ std::unordered_multiset<BigType<SIZE, COPIES>, \
+ absl::Hash<BigType<SIZE, COPIES>>>; \
+ using stl_unordered_multimap_size##SIZE##copies##COPIES = \
+ std::unordered_multimap<BigType<SIZE, COPIES>, intptr_t, \
+ absl::Hash<BigType<SIZE, COPIES>>>; \
+ using btree_256_set_size##SIZE##copies##COPIES = \
+ btree_set<BigType<SIZE, COPIES>>; \
+ using btree_256_map_size##SIZE##copies##COPIES = \
+ btree_map<BigType<SIZE, COPIES>, intptr_t>; \
+ using btree_256_multiset_size##SIZE##copies##COPIES = \
+ btree_multiset<BigType<SIZE, COPIES>>; \
+ using btree_256_multimap_size##SIZE##copies##COPIES = \
+ btree_multimap<BigType<SIZE, COPIES>, intptr_t>; \
+ MY_BENCHMARK(size##SIZE##copies##COPIES)
+
+// Define BIG_TYPE_TESTING to see benchmarks for more big types.
+//
+// You can use --copt=-DBIG_TYPE_TESTING.
+#ifndef NODESIZE_TESTING
+#ifdef BIG_TYPE_TESTING
+BIG_TYPE_BENCHMARKS(1, 4);
+BIG_TYPE_BENCHMARKS(4, 1);
+BIG_TYPE_BENCHMARKS(4, 4);
+BIG_TYPE_BENCHMARKS(1, 8);
+BIG_TYPE_BENCHMARKS(8, 1);
+BIG_TYPE_BENCHMARKS(8, 8);
+BIG_TYPE_BENCHMARKS(1, 16);
+BIG_TYPE_BENCHMARKS(16, 1);
+BIG_TYPE_BENCHMARKS(16, 16);
+BIG_TYPE_BENCHMARKS(1, 32);
+BIG_TYPE_BENCHMARKS(32, 1);
+BIG_TYPE_BENCHMARKS(32, 32);
+#else
+BIG_TYPE_BENCHMARKS(32, 32);
+#endif
+#endif
+
+// Benchmark using unique_ptrs to large value types. In order to be able to use
+// the same benchmark code as the other types, use a type that holds a
+// unique_ptr and has a copy constructor.
+template <int Size>
+struct BigTypePtr {
+ BigTypePtr() : BigTypePtr(0) {}
+ explicit BigTypePtr(int x) {
+ ptr = absl::make_unique<BigType<Size, Size>>(x);
+ }
+ BigTypePtr(const BigTypePtr& other) {
+ ptr = absl::make_unique<BigType<Size, Size>>(*other.ptr);
+ }
+ BigTypePtr(BigTypePtr&& other) noexcept = default;
+ BigTypePtr& operator=(const BigTypePtr& other) {
+ ptr = absl::make_unique<BigType<Size, Size>>(*other.ptr);
+ }
+ BigTypePtr& operator=(BigTypePtr&& other) noexcept = default;
+
+ bool operator<(const BigTypePtr& other) const { return *ptr < *other.ptr; }
+ bool operator==(const BigTypePtr& other) const { return *ptr == *other.ptr; }
+
+ std::unique_ptr<BigType<Size, Size>> ptr;
+};
+
+template <int Size>
+double ContainerInfo(const btree_set<BigTypePtr<Size>>& b) {
+ const double bytes_used =
+ b.bytes_used() + b.size() * sizeof(BigType<Size, Size>);
+ const double bytes_per_value = bytes_used / b.size();
+ BtreeContainerInfoLog(b, bytes_used, bytes_per_value);
+ return bytes_per_value;
+}
+template <int Size>
+double ContainerInfo(const btree_map<int, BigTypePtr<Size>>& b) {
+ const double bytes_used =
+ b.bytes_used() + b.size() * sizeof(BigType<Size, Size>);
+ const double bytes_per_value = bytes_used / b.size();
+ BtreeContainerInfoLog(b, bytes_used, bytes_per_value);
+ return bytes_per_value;
+}
+
+#define BIG_TYPE_PTR_BENCHMARKS(SIZE) \
+ using stl_set_size##SIZE##copies##SIZE##ptr = std::set<BigType<SIZE, SIZE>>; \
+ using stl_map_size##SIZE##copies##SIZE##ptr = \
+ std::map<int, BigType<SIZE, SIZE>>; \
+ using stl_unordered_set_size##SIZE##copies##SIZE##ptr = \
+ std::unordered_set<BigType<SIZE, SIZE>, \
+ absl::Hash<BigType<SIZE, SIZE>>>; \
+ using stl_unordered_map_size##SIZE##copies##SIZE##ptr = \
+ std::unordered_map<int, BigType<SIZE, SIZE>>; \
+ using flat_hash_set_size##SIZE##copies##SIZE##ptr = \
+ flat_hash_set<BigType<SIZE, SIZE>>; \
+ using flat_hash_map_size##SIZE##copies##SIZE##ptr = \
+ flat_hash_map<int, BigTypePtr<SIZE>>; \
+ using btree_256_set_size##SIZE##copies##SIZE##ptr = \
+ btree_set<BigTypePtr<SIZE>>; \
+ using btree_256_map_size##SIZE##copies##SIZE##ptr = \
+ btree_map<int, BigTypePtr<SIZE>>; \
+ MY_BENCHMARK3(stl_set_size##SIZE##copies##SIZE##ptr); \
+ MY_BENCHMARK3(stl_unordered_set_size##SIZE##copies##SIZE##ptr); \
+ MY_BENCHMARK3(flat_hash_set_size##SIZE##copies##SIZE##ptr); \
+ MY_BENCHMARK3(btree_256_set_size##SIZE##copies##SIZE##ptr); \
+ MY_BENCHMARK3(stl_map_size##SIZE##copies##SIZE##ptr); \
+ MY_BENCHMARK3(stl_unordered_map_size##SIZE##copies##SIZE##ptr); \
+ MY_BENCHMARK3(flat_hash_map_size##SIZE##copies##SIZE##ptr); \
+ MY_BENCHMARK3(btree_256_map_size##SIZE##copies##SIZE##ptr)
+
+BIG_TYPE_PTR_BENCHMARKS(32);
+
+} // namespace
+} // namespace container_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/container/btree_map.h b/third_party/abseil/src/absl/container/btree_map.h
new file mode 100644
index 0000000..abc09b0
--- /dev/null
+++ b/third_party/abseil/src/absl/container/btree_map.h
@@ -0,0 +1,769 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: btree_map.h
+// -----------------------------------------------------------------------------
+//
+// This header file defines B-tree maps: sorted associative containers mapping
+// keys to values.
+//
+// * `absl::btree_map<>`
+// * `absl::btree_multimap<>`
+//
+// These B-tree types are similar to the corresponding types in the STL
+// (`std::map` and `std::multimap`) and generally conform to the STL interfaces
+// of those types. However, because they are implemented using B-trees, they
+// are more efficient in most situations.
+//
+// Unlike `std::map` and `std::multimap`, which are commonly implemented using
+// red-black tree nodes, B-tree maps use more generic B-tree nodes able to hold
+// multiple values per node. Holding multiple values per node often makes
+// B-tree maps perform better than their `std::map` counterparts, because
+// multiple entries can be checked within the same cache hit.
+//
+// However, these types should not be considered drop-in replacements for
+// `std::map` and `std::multimap` as there are some API differences, which are
+// noted in this header file.
+//
+// Importantly, insertions and deletions may invalidate outstanding iterators,
+// pointers, and references to elements. Such invalidations are typically only
+// an issue if insertion and deletion operations are interleaved with the use of
+// more than one iterator, pointer, or reference simultaneously. For this
+// reason, `insert()` and `erase()` return a valid iterator at the current
+// position.
+
+#ifndef ABSL_CONTAINER_BTREE_MAP_H_
+#define ABSL_CONTAINER_BTREE_MAP_H_
+
+#include "absl/container/internal/btree.h" // IWYU pragma: export
+#include "absl/container/internal/btree_container.h" // IWYU pragma: export
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+// absl::btree_map<>
+//
+// An `absl::btree_map<K, V>` is an ordered associative container of
+// unique keys and associated values designed to be a more efficient replacement
+// for `std::map` (in most cases).
+//
+// Keys are sorted using an (optional) comparison function, which defaults to
+// `std::less<K>`.
+//
+// An `absl::btree_map<K, V>` uses a default allocator of
+// `std::allocator<std::pair<const K, V>>` to allocate (and deallocate)
+// nodes, and construct and destruct values within those nodes. You may
+// instead specify a custom allocator `A` (which in turn requires specifying a
+// custom comparator `C`) as in `absl::btree_map<K, V, C, A>`.
+//
+template <typename Key, typename Value, typename Compare = std::less<Key>,
+ typename Alloc = std::allocator<std::pair<const Key, Value>>>
+class btree_map
+ : public container_internal::btree_map_container<
+ container_internal::btree<container_internal::map_params<
+ Key, Value, Compare, Alloc, /*TargetNodeSize=*/256,
+ /*Multi=*/false>>> {
+ using Base = typename btree_map::btree_map_container;
+
+ public:
+ // Constructors and Assignment Operators
+ //
+ // A `btree_map` supports the same overload set as `std::map`
+ // for construction and assignment:
+ //
+ // * Default constructor
+ //
+ // absl::btree_map<int, std::string> map1;
+ //
+ // * Initializer List constructor
+ //
+ // absl::btree_map<int, std::string> map2 =
+ // {{1, "huey"}, {2, "dewey"}, {3, "louie"},};
+ //
+ // * Copy constructor
+ //
+ // absl::btree_map<int, std::string> map3(map2);
+ //
+ // * Copy assignment operator
+ //
+ // absl::btree_map<int, std::string> map4;
+ // map4 = map3;
+ //
+ // * Move constructor
+ //
+ // // Move is guaranteed efficient
+ // absl::btree_map<int, std::string> map5(std::move(map4));
+ //
+ // * Move assignment operator
+ //
+ // // May be efficient if allocators are compatible
+ // absl::btree_map<int, std::string> map6;
+ // map6 = std::move(map5);
+ //
+ // * Range constructor
+ //
+ // std::vector<std::pair<int, std::string>> v = {{1, "a"}, {2, "b"}};
+ // absl::btree_map<int, std::string> map7(v.begin(), v.end());
+ btree_map() {}
+ using Base::Base;
+
+ // btree_map::begin()
+ //
+ // Returns an iterator to the beginning of the `btree_map`.
+ using Base::begin;
+
+ // btree_map::cbegin()
+ //
+ // Returns a const iterator to the beginning of the `btree_map`.
+ using Base::cbegin;
+
+ // btree_map::end()
+ //
+ // Returns an iterator to the end of the `btree_map`.
+ using Base::end;
+
+ // btree_map::cend()
+ //
+ // Returns a const iterator to the end of the `btree_map`.
+ using Base::cend;
+
+ // btree_map::empty()
+ //
+ // Returns whether or not the `btree_map` is empty.
+ using Base::empty;
+
+ // btree_map::max_size()
+ //
+ // Returns the largest theoretical possible number of elements within a
+ // `btree_map` under current memory constraints. This value can be thought
+ // of as the largest value of `std::distance(begin(), end())` for a
+ // `btree_map<Key, T>`.
+ using Base::max_size;
+
+ // btree_map::size()
+ //
+ // Returns the number of elements currently within the `btree_map`.
+ using Base::size;
+
+ // btree_map::clear()
+ //
+ // Removes all elements from the `btree_map`. Invalidates any references,
+ // pointers, or iterators referring to contained elements.
+ using Base::clear;
+
+ // btree_map::erase()
+ //
+ // Erases elements within the `btree_map`. If an erase occurs, any references,
+ // pointers, or iterators are invalidated.
+ // Overloads are listed below.
+ //
+ // iterator erase(iterator position):
+ // iterator erase(const_iterator position):
+ //
+ // Erases the element at `position` of the `btree_map`, returning
+ // the iterator pointing to the element after the one that was erased
+ // (or end() if none exists).
+ //
+ // iterator erase(const_iterator first, const_iterator last):
+ //
+ // Erases the elements in the open interval [`first`, `last`), returning
+ // the iterator pointing to the element after the interval that was erased
+ // (or end() if none exists).
+ //
+ // template <typename K> size_type erase(const K& key):
+ //
+ // Erases the element with the matching key, if it exists, returning the
+ // number of elements erased (0 or 1).
+ using Base::erase;
+
+ // btree_map::insert()
+ //
+ // Inserts an element of the specified value into the `btree_map`,
+ // returning an iterator pointing to the newly inserted element, provided that
+ // an element with the given key does not already exist. If an insertion
+ // occurs, any references, pointers, or iterators are invalidated.
+ // Overloads are listed below.
+ //
+ // std::pair<iterator,bool> insert(const value_type& value):
+ //
+ // Inserts a value into the `btree_map`. Returns a pair consisting of an
+ // iterator to the inserted element (or to the element that prevented the
+ // insertion) and a bool denoting whether the insertion took place.
+ //
+ // std::pair<iterator,bool> insert(value_type&& value):
+ //
+ // Inserts a moveable value into the `btree_map`. Returns a pair
+ // consisting of an iterator to the inserted element (or to the element that
+ // prevented the insertion) and a bool denoting whether the insertion took
+ // place.
+ //
+ // iterator insert(const_iterator hint, const value_type& value):
+ // iterator insert(const_iterator hint, value_type&& value):
+ //
+ // Inserts a value, using the position of `hint` as a non-binding suggestion
+ // for where to begin the insertion search. Returns an iterator to the
+ // inserted element, or to the existing element that prevented the
+ // insertion.
+ //
+ // void insert(InputIterator first, InputIterator last):
+ //
+ // Inserts a range of values [`first`, `last`).
+ //
+ // void insert(std::initializer_list<init_type> ilist):
+ //
+ // Inserts the elements within the initializer list `ilist`.
+ using Base::insert;
+
+ // btree_map::insert_or_assign()
+ //
+ // Inserts an element of the specified value into the `btree_map` provided
+ // that a value with the given key does not already exist, or replaces the
+ // corresponding mapped type with the forwarded `obj` argument if a key for
+ // that value already exists, returning an iterator pointing to the newly
+ // inserted element. Overloads are listed below.
+ //
+ // pair<iterator, bool> insert_or_assign(const key_type& k, M&& obj):
+ // pair<iterator, bool> insert_or_assign(key_type&& k, M&& obj):
+ //
+ // Inserts/Assigns (or moves) the element of the specified key into the
+ // `btree_map`. If the returned bool is true, insertion took place, and if
+ // it's false, assignment took place.
+ //
+ // iterator insert_or_assign(const_iterator hint,
+ // const key_type& k, M&& obj):
+ // iterator insert_or_assign(const_iterator hint, key_type&& k, M&& obj):
+ //
+ // Inserts/Assigns (or moves) the element of the specified key into the
+ // `btree_map` using the position of `hint` as a non-binding suggestion
+ // for where to begin the insertion search.
+ using Base::insert_or_assign;
+
+ // btree_map::emplace()
+ //
+ // Inserts an element of the specified value by constructing it in-place
+ // within the `btree_map`, provided that no element with the given key
+ // already exists.
+ //
+ // The element may be constructed even if there already is an element with the
+ // key in the container, in which case the newly constructed element will be
+ // destroyed immediately. Prefer `try_emplace()` unless your key is not
+ // copyable or moveable.
+ //
+ // If an insertion occurs, any references, pointers, or iterators are
+ // invalidated.
+ using Base::emplace;
+
+ // btree_map::emplace_hint()
+ //
+ // Inserts an element of the specified value by constructing it in-place
+ // within the `btree_map`, using the position of `hint` as a non-binding
+ // suggestion for where to begin the insertion search, and only inserts
+ // provided that no element with the given key already exists.
+ //
+ // The element may be constructed even if there already is an element with the
+ // key in the container, in which case the newly constructed element will be
+ // destroyed immediately. Prefer `try_emplace()` unless your key is not
+ // copyable or moveable.
+ //
+ // If an insertion occurs, any references, pointers, or iterators are
+ // invalidated.
+ using Base::emplace_hint;
+
+ // btree_map::try_emplace()
+ //
+ // Inserts an element of the specified value by constructing it in-place
+ // within the `btree_map`, provided that no element with the given key
+ // already exists. Unlike `emplace()`, if an element with the given key
+ // already exists, we guarantee that no element is constructed.
+ //
+ // If an insertion occurs, any references, pointers, or iterators are
+ // invalidated.
+ //
+ // Overloads are listed below.
+ //
+ // std::pair<iterator, bool> try_emplace(const key_type& k, Args&&... args):
+ // std::pair<iterator, bool> try_emplace(key_type&& k, Args&&... args):
+ //
+ // Inserts (via copy or move) the element of the specified key into the
+ // `btree_map`.
+ //
+ // iterator try_emplace(const_iterator hint,
+ // const key_type& k, Args&&... args):
+ // iterator try_emplace(const_iterator hint, key_type&& k, Args&&... args):
+ //
+ // Inserts (via copy or move) the element of the specified key into the
+ // `btree_map` using the position of `hint` as a non-binding suggestion
+ // for where to begin the insertion search.
+ using Base::try_emplace;
+
+ // btree_map::extract()
+ //
+ // Extracts the indicated element, erasing it in the process, and returns it
+ // as a C++17-compatible node handle. Overloads are listed below.
+ //
+ // node_type extract(const_iterator position):
+ //
+ // Extracts the element at the indicated position and returns a node handle
+ // owning that extracted data.
+ //
+ // template <typename K> node_type extract(const K& k):
+ //
+ // Extracts the element with the key matching the passed key value and
+ // returns a node handle owning that extracted data. If the `btree_map`
+ // does not contain an element with a matching key, this function returns an
+ // empty node handle.
+ //
+ // NOTE: when compiled in an earlier version of C++ than C++17,
+ // `node_type::key()` returns a const reference to the key instead of a
+ // mutable reference. We cannot safely return a mutable reference without
+ // std::launder (which is not available before C++17).
+ //
+ // NOTE: In this context, `node_type` refers to the C++17 concept of a
+ // move-only type that owns and provides access to the elements in associative
+ // containers (https://en.cppreference.com/w/cpp/container/node_handle).
+ // It does NOT refer to the data layout of the underlying btree.
+ using Base::extract;
+
+ // btree_map::merge()
+ //
+ // Extracts elements from a given `source` btree_map into this
+ // `btree_map`. If the destination `btree_map` already contains an
+ // element with an equivalent key, that element is not extracted.
+ using Base::merge;
+
+ // btree_map::swap(btree_map& other)
+ //
+ // Exchanges the contents of this `btree_map` with those of the `other`
+ // btree_map, avoiding invocation of any move, copy, or swap operations on
+ // individual elements.
+ //
+ // All iterators and references on the `btree_map` remain valid, excepting
+ // for the past-the-end iterator, which is invalidated.
+ using Base::swap;
+
+ // btree_map::at()
+ //
+ // Returns a reference to the mapped value of the element with key equivalent
+ // to the passed key.
+ using Base::at;
+
+ // btree_map::contains()
+ //
+ // template <typename K> bool contains(const K& key) const:
+ //
+ // Determines whether an element comparing equal to the given `key` exists
+ // within the `btree_map`, returning `true` if so or `false` otherwise.
+ //
+ // Supports heterogeneous lookup, provided that the map is provided a
+ // compatible heterogeneous comparator.
+ using Base::contains;
+
+ // btree_map::count()
+ //
+ // template <typename K> size_type count(const K& key) const:
+ //
+ // Returns the number of elements comparing equal to the given `key` within
+ // the `btree_map`. Note that this function will return either `1` or `0`
+ // since duplicate elements are not allowed within a `btree_map`.
+ //
+ // Supports heterogeneous lookup, provided that the map is provided a
+ // compatible heterogeneous comparator.
+ using Base::count;
+
+ // btree_map::equal_range()
+ //
+ // Returns a closed range [first, last], defined by a `std::pair` of two
+ // iterators, containing all elements with the passed key in the
+ // `btree_map`.
+ using Base::equal_range;
+
+ // btree_map::find()
+ //
+ // template <typename K> iterator find(const K& key):
+ // template <typename K> const_iterator find(const K& key) const:
+ //
+ // Finds an element with the passed `key` within the `btree_map`.
+ //
+ // Supports heterogeneous lookup, provided that the map is provided a
+ // compatible heterogeneous comparator.
+ using Base::find;
+
+ // btree_map::operator[]()
+ //
+ // Returns a reference to the value mapped to the passed key within the
+ // `btree_map`, performing an `insert()` if the key does not already
+ // exist.
+ //
+ // If an insertion occurs, any references, pointers, or iterators are
+ // invalidated. Otherwise iterators are not affected and references are not
+ // invalidated. Overloads are listed below.
+ //
+ // T& operator[](key_type&& key):
+ // T& operator[](const key_type& key):
+ //
+ // Inserts a value_type object constructed in-place if the element with the
+ // given key does not exist.
+ using Base::operator[];
+
+ // btree_map::get_allocator()
+ //
+ // Returns the allocator function associated with this `btree_map`.
+ using Base::get_allocator;
+
+ // btree_map::key_comp();
+ //
+ // Returns the key comparator associated with this `btree_map`.
+ using Base::key_comp;
+
+ // btree_map::value_comp();
+ //
+ // Returns the value comparator associated with this `btree_map`.
+ using Base::value_comp;
+};
+
+// absl::swap(absl::btree_map<>, absl::btree_map<>)
+//
+// Swaps the contents of two `absl::btree_map` containers.
+template <typename K, typename V, typename C, typename A>
+void swap(btree_map<K, V, C, A> &x, btree_map<K, V, C, A> &y) {
+ return x.swap(y);
+}
+
+// absl::erase_if(absl::btree_map<>, Pred)
+//
+// Erases all elements that satisfy the predicate pred from the container.
+template <typename K, typename V, typename C, typename A, typename Pred>
+void erase_if(btree_map<K, V, C, A> &map, Pred pred) {
+ for (auto it = map.begin(); it != map.end();) {
+ if (pred(*it)) {
+ it = map.erase(it);
+ } else {
+ ++it;
+ }
+ }
+}
+
+// absl::btree_multimap
+//
+// An `absl::btree_multimap<K, V>` is an ordered associative container of
+// keys and associated values designed to be a more efficient replacement for
+// `std::multimap` (in most cases). Unlike `absl::btree_map`, a B-tree multimap
+// allows multiple elements with equivalent keys.
+//
+// Keys are sorted using an (optional) comparison function, which defaults to
+// `std::less<K>`.
+//
+// An `absl::btree_multimap<K, V>` uses a default allocator of
+// `std::allocator<std::pair<const K, V>>` to allocate (and deallocate)
+// nodes, and construct and destruct values within those nodes. You may
+// instead specify a custom allocator `A` (which in turn requires specifying a
+// custom comparator `C`) as in `absl::btree_multimap<K, V, C, A>`.
+//
+template <typename Key, typename Value, typename Compare = std::less<Key>,
+ typename Alloc = std::allocator<std::pair<const Key, Value>>>
+class btree_multimap
+ : public container_internal::btree_multimap_container<
+ container_internal::btree<container_internal::map_params<
+ Key, Value, Compare, Alloc, /*TargetNodeSize=*/256,
+ /*Multi=*/true>>> {
+ using Base = typename btree_multimap::btree_multimap_container;
+
+ public:
+ // Constructors and Assignment Operators
+ //
+ // A `btree_multimap` supports the same overload set as `std::multimap`
+ // for construction and assignment:
+ //
+ // * Default constructor
+ //
+ // absl::btree_multimap<int, std::string> map1;
+ //
+ // * Initializer List constructor
+ //
+ // absl::btree_multimap<int, std::string> map2 =
+ // {{1, "huey"}, {2, "dewey"}, {3, "louie"},};
+ //
+ // * Copy constructor
+ //
+ // absl::btree_multimap<int, std::string> map3(map2);
+ //
+ // * Copy assignment operator
+ //
+ // absl::btree_multimap<int, std::string> map4;
+ // map4 = map3;
+ //
+ // * Move constructor
+ //
+ // // Move is guaranteed efficient
+ // absl::btree_multimap<int, std::string> map5(std::move(map4));
+ //
+ // * Move assignment operator
+ //
+ // // May be efficient if allocators are compatible
+ // absl::btree_multimap<int, std::string> map6;
+ // map6 = std::move(map5);
+ //
+ // * Range constructor
+ //
+ // std::vector<std::pair<int, std::string>> v = {{1, "a"}, {2, "b"}};
+ // absl::btree_multimap<int, std::string> map7(v.begin(), v.end());
+ btree_multimap() {}
+ using Base::Base;
+
+ // btree_multimap::begin()
+ //
+ // Returns an iterator to the beginning of the `btree_multimap`.
+ using Base::begin;
+
+ // btree_multimap::cbegin()
+ //
+ // Returns a const iterator to the beginning of the `btree_multimap`.
+ using Base::cbegin;
+
+ // btree_multimap::end()
+ //
+ // Returns an iterator to the end of the `btree_multimap`.
+ using Base::end;
+
+ // btree_multimap::cend()
+ //
+ // Returns a const iterator to the end of the `btree_multimap`.
+ using Base::cend;
+
+ // btree_multimap::empty()
+ //
+ // Returns whether or not the `btree_multimap` is empty.
+ using Base::empty;
+
+ // btree_multimap::max_size()
+ //
+ // Returns the largest theoretical possible number of elements within a
+ // `btree_multimap` under current memory constraints. This value can be
+ // thought of as the largest value of `std::distance(begin(), end())` for a
+ // `btree_multimap<Key, T>`.
+ using Base::max_size;
+
+ // btree_multimap::size()
+ //
+ // Returns the number of elements currently within the `btree_multimap`.
+ using Base::size;
+
+ // btree_multimap::clear()
+ //
+ // Removes all elements from the `btree_multimap`. Invalidates any references,
+ // pointers, or iterators referring to contained elements.
+ using Base::clear;
+
+ // btree_multimap::erase()
+ //
+ // Erases elements within the `btree_multimap`. If an erase occurs, any
+ // references, pointers, or iterators are invalidated.
+ // Overloads are listed below.
+ //
+ // iterator erase(iterator position):
+ // iterator erase(const_iterator position):
+ //
+ // Erases the element at `position` of the `btree_multimap`, returning
+ // the iterator pointing to the element after the one that was erased
+ // (or end() if none exists).
+ //
+ // iterator erase(const_iterator first, const_iterator last):
+ //
+ // Erases the elements in the open interval [`first`, `last`), returning
+ // the iterator pointing to the element after the interval that was erased
+ // (or end() if none exists).
+ //
+ // template <typename K> size_type erase(const K& key):
+ //
+ // Erases the elements matching the key, if any exist, returning the
+ // number of elements erased.
+ using Base::erase;
+
+ // btree_multimap::insert()
+ //
+ // Inserts an element of the specified value into the `btree_multimap`,
+ // returning an iterator pointing to the newly inserted element.
+ // Any references, pointers, or iterators are invalidated. Overloads are
+ // listed below.
+ //
+ // iterator insert(const value_type& value):
+ //
+ // Inserts a value into the `btree_multimap`, returning an iterator to the
+ // inserted element.
+ //
+ // iterator insert(value_type&& value):
+ //
+ // Inserts a moveable value into the `btree_multimap`, returning an iterator
+ // to the inserted element.
+ //
+ // iterator insert(const_iterator hint, const value_type& value):
+ // iterator insert(const_iterator hint, value_type&& value):
+ //
+ // Inserts a value, using the position of `hint` as a non-binding suggestion
+ // for where to begin the insertion search. Returns an iterator to the
+ // inserted element.
+ //
+ // void insert(InputIterator first, InputIterator last):
+ //
+ // Inserts a range of values [`first`, `last`).
+ //
+ // void insert(std::initializer_list<init_type> ilist):
+ //
+ // Inserts the elements within the initializer list `ilist`.
+ using Base::insert;
+
+ // btree_multimap::emplace()
+ //
+ // Inserts an element of the specified value by constructing it in-place
+ // within the `btree_multimap`. Any references, pointers, or iterators are
+ // invalidated.
+ using Base::emplace;
+
+ // btree_multimap::emplace_hint()
+ //
+ // Inserts an element of the specified value by constructing it in-place
+ // within the `btree_multimap`, using the position of `hint` as a non-binding
+ // suggestion for where to begin the insertion search.
+ //
+ // Any references, pointers, or iterators are invalidated.
+ using Base::emplace_hint;
+
+ // btree_multimap::extract()
+ //
+ // Extracts the indicated element, erasing it in the process, and returns it
+ // as a C++17-compatible node handle. Overloads are listed below.
+ //
+ // node_type extract(const_iterator position):
+ //
+ // Extracts the element at the indicated position and returns a node handle
+ // owning that extracted data.
+ //
+ // template <typename K> node_type extract(const K& k):
+ //
+ // Extracts the element with the key matching the passed key value and
+ // returns a node handle owning that extracted data. If the `btree_multimap`
+ // does not contain an element with a matching key, this function returns an
+ // empty node handle.
+ //
+ // NOTE: when compiled in an earlier version of C++ than C++17,
+ // `node_type::key()` returns a const reference to the key instead of a
+ // mutable reference. We cannot safely return a mutable reference without
+ // std::launder (which is not available before C++17).
+ //
+ // NOTE: In this context, `node_type` refers to the C++17 concept of a
+ // move-only type that owns and provides access to the elements in associative
+ // containers (https://en.cppreference.com/w/cpp/container/node_handle).
+ // It does NOT refer to the data layout of the underlying btree.
+ using Base::extract;
+
+ // btree_multimap::merge()
+ //
+ // Extracts elements from a given `source` btree_multimap into this
+ // `btree_multimap`. If the destination `btree_multimap` already contains an
+ // element with an equivalent key, that element is not extracted.
+ using Base::merge;
+
+ // btree_multimap::swap(btree_multimap& other)
+ //
+ // Exchanges the contents of this `btree_multimap` with those of the `other`
+ // btree_multimap, avoiding invocation of any move, copy, or swap operations
+ // on individual elements.
+ //
+ // All iterators and references on the `btree_multimap` remain valid,
+ // excepting for the past-the-end iterator, which is invalidated.
+ using Base::swap;
+
+ // btree_multimap::contains()
+ //
+ // template <typename K> bool contains(const K& key) const:
+ //
+ // Determines whether an element comparing equal to the given `key` exists
+ // within the `btree_multimap`, returning `true` if so or `false` otherwise.
+ //
+ // Supports heterogeneous lookup, provided that the map is provided a
+ // compatible heterogeneous comparator.
+ using Base::contains;
+
+ // btree_multimap::count()
+ //
+ // template <typename K> size_type count(const K& key) const:
+ //
+ // Returns the number of elements comparing equal to the given `key` within
+ // the `btree_multimap`.
+ //
+ // Supports heterogeneous lookup, provided that the map is provided a
+ // compatible heterogeneous comparator.
+ using Base::count;
+
+ // btree_multimap::equal_range()
+ //
+ // Returns a closed range [first, last], defined by a `std::pair` of two
+ // iterators, containing all elements with the passed key in the
+ // `btree_multimap`.
+ using Base::equal_range;
+
+ // btree_multimap::find()
+ //
+ // template <typename K> iterator find(const K& key):
+ // template <typename K> const_iterator find(const K& key) const:
+ //
+ // Finds an element with the passed `key` within the `btree_multimap`.
+ //
+ // Supports heterogeneous lookup, provided that the map is provided a
+ // compatible heterogeneous comparator.
+ using Base::find;
+
+ // btree_multimap::get_allocator()
+ //
+ // Returns the allocator function associated with this `btree_multimap`.
+ using Base::get_allocator;
+
+ // btree_multimap::key_comp();
+ //
+ // Returns the key comparator associated with this `btree_multimap`.
+ using Base::key_comp;
+
+ // btree_multimap::value_comp();
+ //
+ // Returns the value comparator associated with this `btree_multimap`.
+ using Base::value_comp;
+};
+
+// absl::swap(absl::btree_multimap<>, absl::btree_multimap<>)
+//
+// Swaps the contents of two `absl::btree_multimap` containers.
+template <typename K, typename V, typename C, typename A>
+void swap(btree_multimap<K, V, C, A> &x, btree_multimap<K, V, C, A> &y) {
+ return x.swap(y);
+}
+
+// absl::erase_if(absl::btree_multimap<>, Pred)
+//
+// Erases all elements that satisfy the predicate pred from the container.
+template <typename K, typename V, typename C, typename A, typename Pred>
+void erase_if(btree_multimap<K, V, C, A> &map, Pred pred) {
+ for (auto it = map.begin(); it != map.end();) {
+ if (pred(*it)) {
+ it = map.erase(it);
+ } else {
+ ++it;
+ }
+ }
+}
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_CONTAINER_BTREE_MAP_H_
diff --git a/third_party/abseil/src/absl/container/btree_set.h b/third_party/abseil/src/absl/container/btree_set.h
new file mode 100644
index 0000000..21ef0a0
--- /dev/null
+++ b/third_party/abseil/src/absl/container/btree_set.h
@@ -0,0 +1,683 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: btree_set.h
+// -----------------------------------------------------------------------------
+//
+// This header file defines B-tree sets: sorted associative containers of
+// values.
+//
+// * `absl::btree_set<>`
+// * `absl::btree_multiset<>`
+//
+// These B-tree types are similar to the corresponding types in the STL
+// (`std::set` and `std::multiset`) and generally conform to the STL interfaces
+// of those types. However, because they are implemented using B-trees, they
+// are more efficient in most situations.
+//
+// Unlike `std::set` and `std::multiset`, which are commonly implemented using
+// red-black tree nodes, B-tree sets use more generic B-tree nodes able to hold
+// multiple values per node. Holding multiple values per node often makes
+// B-tree sets perform better than their `std::set` counterparts, because
+// multiple entries can be checked within the same cache hit.
+//
+// However, these types should not be considered drop-in replacements for
+// `std::set` and `std::multiset` as there are some API differences, which are
+// noted in this header file.
+//
+// Importantly, insertions and deletions may invalidate outstanding iterators,
+// pointers, and references to elements. Such invalidations are typically only
+// an issue if insertion and deletion operations are interleaved with the use of
+// more than one iterator, pointer, or reference simultaneously. For this
+// reason, `insert()` and `erase()` return a valid iterator at the current
+// position.
+
+#ifndef ABSL_CONTAINER_BTREE_SET_H_
+#define ABSL_CONTAINER_BTREE_SET_H_
+
+#include "absl/container/internal/btree.h" // IWYU pragma: export
+#include "absl/container/internal/btree_container.h" // IWYU pragma: export
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+// absl::btree_set<>
+//
+// An `absl::btree_set<K>` is an ordered associative container of unique key
+// values designed to be a more efficient replacement for `std::set` (in most
+// cases).
+//
+// Keys are sorted using an (optional) comparison function, which defaults to
+// `std::less<K>`.
+//
+// An `absl::btree_set<K>` uses a default allocator of `std::allocator<K>` to
+// allocate (and deallocate) nodes, and construct and destruct values within
+// those nodes. You may instead specify a custom allocator `A` (which in turn
+// requires specifying a custom comparator `C`) as in
+// `absl::btree_set<K, C, A>`.
+//
+template <typename Key, typename Compare = std::less<Key>,
+ typename Alloc = std::allocator<Key>>
+class btree_set
+ : public container_internal::btree_set_container<
+ container_internal::btree<container_internal::set_params<
+ Key, Compare, Alloc, /*TargetNodeSize=*/256,
+ /*Multi=*/false>>> {
+ using Base = typename btree_set::btree_set_container;
+
+ public:
+ // Constructors and Assignment Operators
+ //
+ // A `btree_set` supports the same overload set as `std::set`
+ // for construction and assignment:
+ //
+ // * Default constructor
+ //
+ // absl::btree_set<std::string> set1;
+ //
+ // * Initializer List constructor
+ //
+ // absl::btree_set<std::string> set2 =
+ // {{"huey"}, {"dewey"}, {"louie"},};
+ //
+ // * Copy constructor
+ //
+ // absl::btree_set<std::string> set3(set2);
+ //
+ // * Copy assignment operator
+ //
+ // absl::btree_set<std::string> set4;
+ // set4 = set3;
+ //
+ // * Move constructor
+ //
+ // // Move is guaranteed efficient
+ // absl::btree_set<std::string> set5(std::move(set4));
+ //
+ // * Move assignment operator
+ //
+ // // May be efficient if allocators are compatible
+ // absl::btree_set<std::string> set6;
+ // set6 = std::move(set5);
+ //
+ // * Range constructor
+ //
+ // std::vector<std::string> v = {"a", "b"};
+ // absl::btree_set<std::string> set7(v.begin(), v.end());
+ btree_set() {}
+ using Base::Base;
+
+ // btree_set::begin()
+ //
+ // Returns an iterator to the beginning of the `btree_set`.
+ using Base::begin;
+
+ // btree_set::cbegin()
+ //
+ // Returns a const iterator to the beginning of the `btree_set`.
+ using Base::cbegin;
+
+ // btree_set::end()
+ //
+ // Returns an iterator to the end of the `btree_set`.
+ using Base::end;
+
+ // btree_set::cend()
+ //
+ // Returns a const iterator to the end of the `btree_set`.
+ using Base::cend;
+
+ // btree_set::empty()
+ //
+ // Returns whether or not the `btree_set` is empty.
+ using Base::empty;
+
+ // btree_set::max_size()
+ //
+ // Returns the largest theoretical possible number of elements within a
+ // `btree_set` under current memory constraints. This value can be thought
+ // of as the largest value of `std::distance(begin(), end())` for a
+ // `btree_set<Key>`.
+ using Base::max_size;
+
+ // btree_set::size()
+ //
+ // Returns the number of elements currently within the `btree_set`.
+ using Base::size;
+
+ // btree_set::clear()
+ //
+ // Removes all elements from the `btree_set`. Invalidates any references,
+ // pointers, or iterators referring to contained elements.
+ using Base::clear;
+
+ // btree_set::erase()
+ //
+ // Erases elements within the `btree_set`. Overloads are listed below.
+ //
+ // iterator erase(iterator position):
+ // iterator erase(const_iterator position):
+ //
+ // Erases the element at `position` of the `btree_set`, returning
+ // the iterator pointing to the element after the one that was erased
+ // (or end() if none exists).
+ //
+ // iterator erase(const_iterator first, const_iterator last):
+ //
+ // Erases the elements in the open interval [`first`, `last`), returning
+ // the iterator pointing to the element after the interval that was erased
+ // (or end() if none exists).
+ //
+ // template <typename K> size_type erase(const K& key):
+ //
+ // Erases the element with the matching key, if it exists, returning the
+ // number of elements erased (0 or 1).
+ using Base::erase;
+
+ // btree_set::insert()
+ //
+ // Inserts an element of the specified value into the `btree_set`,
+ // returning an iterator pointing to the newly inserted element, provided that
+ // an element with the given key does not already exist. If an insertion
+ // occurs, any references, pointers, or iterators are invalidated.
+ // Overloads are listed below.
+ //
+ // std::pair<iterator,bool> insert(const value_type& value):
+ //
+ // Inserts a value into the `btree_set`. Returns a pair consisting of an
+ // iterator to the inserted element (or to the element that prevented the
+ // insertion) and a bool denoting whether the insertion took place.
+ //
+ // std::pair<iterator,bool> insert(value_type&& value):
+ //
+ // Inserts a moveable value into the `btree_set`. Returns a pair
+ // consisting of an iterator to the inserted element (or to the element that
+ // prevented the insertion) and a bool denoting whether the insertion took
+ // place.
+ //
+ // iterator insert(const_iterator hint, const value_type& value):
+ // iterator insert(const_iterator hint, value_type&& value):
+ //
+ // Inserts a value, using the position of `hint` as a non-binding suggestion
+ // for where to begin the insertion search. Returns an iterator to the
+ // inserted element, or to the existing element that prevented the
+ // insertion.
+ //
+ // void insert(InputIterator first, InputIterator last):
+ //
+ // Inserts a range of values [`first`, `last`).
+ //
+ // void insert(std::initializer_list<init_type> ilist):
+ //
+ // Inserts the elements within the initializer list `ilist`.
+ using Base::insert;
+
+ // btree_set::emplace()
+ //
+ // Inserts an element of the specified value by constructing it in-place
+ // within the `btree_set`, provided that no element with the given key
+ // already exists.
+ //
+ // The element may be constructed even if there already is an element with the
+ // key in the container, in which case the newly constructed element will be
+ // destroyed immediately.
+ //
+ // If an insertion occurs, any references, pointers, or iterators are
+ // invalidated.
+ using Base::emplace;
+
+ // btree_set::emplace_hint()
+ //
+ // Inserts an element of the specified value by constructing it in-place
+ // within the `btree_set`, using the position of `hint` as a non-binding
+ // suggestion for where to begin the insertion search, and only inserts
+ // provided that no element with the given key already exists.
+ //
+ // The element may be constructed even if there already is an element with the
+ // key in the container, in which case the newly constructed element will be
+ // destroyed immediately.
+ //
+ // If an insertion occurs, any references, pointers, or iterators are
+ // invalidated.
+ using Base::emplace_hint;
+
+ // btree_set::extract()
+ //
+ // Extracts the indicated element, erasing it in the process, and returns it
+ // as a C++17-compatible node handle. Overloads are listed below.
+ //
+ // node_type extract(const_iterator position):
+ //
+ // Extracts the element at the indicated position and returns a node handle
+ // owning that extracted data.
+ //
+ // template <typename K> node_type extract(const K& k):
+ //
+ // Extracts the element with the key matching the passed key value and
+ // returns a node handle owning that extracted data. If the `btree_set`
+ // does not contain an element with a matching key, this function returns an
+ // empty node handle.
+ //
+ // NOTE: In this context, `node_type` refers to the C++17 concept of a
+ // move-only type that owns and provides access to the elements in associative
+ // containers (https://en.cppreference.com/w/cpp/container/node_handle).
+ // It does NOT refer to the data layout of the underlying btree.
+ using Base::extract;
+
+ // btree_set::merge()
+ //
+ // Extracts elements from a given `source` btree_set into this
+ // `btree_set`. If the destination `btree_set` already contains an
+ // element with an equivalent key, that element is not extracted.
+ using Base::merge;
+
+ // btree_set::swap(btree_set& other)
+ //
+ // Exchanges the contents of this `btree_set` with those of the `other`
+ // btree_set, avoiding invocation of any move, copy, or swap operations on
+ // individual elements.
+ //
+ // All iterators and references on the `btree_set` remain valid, excepting
+ // for the past-the-end iterator, which is invalidated.
+ using Base::swap;
+
+ // btree_set::contains()
+ //
+ // template <typename K> bool contains(const K& key) const:
+ //
+ // Determines whether an element comparing equal to the given `key` exists
+ // within the `btree_set`, returning `true` if so or `false` otherwise.
+ //
+ // Supports heterogeneous lookup, provided that the set is provided a
+ // compatible heterogeneous comparator.
+ using Base::contains;
+
+ // btree_set::count()
+ //
+ // template <typename K> size_type count(const K& key) const:
+ //
+ // Returns the number of elements comparing equal to the given `key` within
+ // the `btree_set`. Note that this function will return either `1` or `0`
+ // since duplicate elements are not allowed within a `btree_set`.
+ //
+ // Supports heterogeneous lookup, provided that the set is provided a
+ // compatible heterogeneous comparator.
+ using Base::count;
+
+ // btree_set::equal_range()
+ //
+ // Returns a closed range [first, last], defined by a `std::pair` of two
+ // iterators, containing all elements with the passed key in the
+ // `btree_set`.
+ using Base::equal_range;
+
+ // btree_set::find()
+ //
+ // template <typename K> iterator find(const K& key):
+ // template <typename K> const_iterator find(const K& key) const:
+ //
+ // Finds an element with the passed `key` within the `btree_set`.
+ //
+ // Supports heterogeneous lookup, provided that the set is provided a
+ // compatible heterogeneous comparator.
+ using Base::find;
+
+ // btree_set::get_allocator()
+ //
+ // Returns the allocator function associated with this `btree_set`.
+ using Base::get_allocator;
+
+ // btree_set::key_comp();
+ //
+ // Returns the key comparator associated with this `btree_set`.
+ using Base::key_comp;
+
+ // btree_set::value_comp();
+ //
+ // Returns the value comparator associated with this `btree_set`. The keys to
+ // sort the elements are the values themselves, therefore `value_comp` and its
+ // sibling member function `key_comp` are equivalent.
+ using Base::value_comp;
+};
+
+// absl::swap(absl::btree_set<>, absl::btree_set<>)
+//
+// Swaps the contents of two `absl::btree_set` containers.
+template <typename K, typename C, typename A>
+void swap(btree_set<K, C, A> &x, btree_set<K, C, A> &y) {
+ return x.swap(y);
+}
+
+// absl::erase_if(absl::btree_set<>, Pred)
+//
+// Erases all elements that satisfy the predicate pred from the container.
+template <typename K, typename C, typename A, typename Pred>
+void erase_if(btree_set<K, C, A> &set, Pred pred) {
+ for (auto it = set.begin(); it != set.end();) {
+ if (pred(*it)) {
+ it = set.erase(it);
+ } else {
+ ++it;
+ }
+ }
+}
+
+// absl::btree_multiset<>
+//
+// An `absl::btree_multiset<K>` is an ordered associative container of
+// keys and associated values designed to be a more efficient replacement
+// for `std::multiset` (in most cases). Unlike `absl::btree_set`, a B-tree
+// multiset allows equivalent elements.
+//
+// Keys are sorted using an (optional) comparison function, which defaults to
+// `std::less<K>`.
+//
+// An `absl::btree_multiset<K>` uses a default allocator of `std::allocator<K>`
+// to allocate (and deallocate) nodes, and construct and destruct values within
+// those nodes. You may instead specify a custom allocator `A` (which in turn
+// requires specifying a custom comparator `C`) as in
+// `absl::btree_multiset<K, C, A>`.
+//
+template <typename Key, typename Compare = std::less<Key>,
+ typename Alloc = std::allocator<Key>>
+class btree_multiset
+ : public container_internal::btree_multiset_container<
+ container_internal::btree<container_internal::set_params<
+ Key, Compare, Alloc, /*TargetNodeSize=*/256,
+ /*Multi=*/true>>> {
+ using Base = typename btree_multiset::btree_multiset_container;
+
+ public:
+ // Constructors and Assignment Operators
+ //
+ // A `btree_multiset` supports the same overload set as `std::set`
+ // for construction and assignment:
+ //
+ // * Default constructor
+ //
+ // absl::btree_multiset<std::string> set1;
+ //
+ // * Initializer List constructor
+ //
+ // absl::btree_multiset<std::string> set2 =
+ // {{"huey"}, {"dewey"}, {"louie"},};
+ //
+ // * Copy constructor
+ //
+ // absl::btree_multiset<std::string> set3(set2);
+ //
+ // * Copy assignment operator
+ //
+ // absl::btree_multiset<std::string> set4;
+ // set4 = set3;
+ //
+ // * Move constructor
+ //
+ // // Move is guaranteed efficient
+ // absl::btree_multiset<std::string> set5(std::move(set4));
+ //
+ // * Move assignment operator
+ //
+ // // May be efficient if allocators are compatible
+ // absl::btree_multiset<std::string> set6;
+ // set6 = std::move(set5);
+ //
+ // * Range constructor
+ //
+ // std::vector<std::string> v = {"a", "b"};
+ // absl::btree_multiset<std::string> set7(v.begin(), v.end());
+ btree_multiset() {}
+ using Base::Base;
+
+ // btree_multiset::begin()
+ //
+ // Returns an iterator to the beginning of the `btree_multiset`.
+ using Base::begin;
+
+ // btree_multiset::cbegin()
+ //
+ // Returns a const iterator to the beginning of the `btree_multiset`.
+ using Base::cbegin;
+
+ // btree_multiset::end()
+ //
+ // Returns an iterator to the end of the `btree_multiset`.
+ using Base::end;
+
+ // btree_multiset::cend()
+ //
+ // Returns a const iterator to the end of the `btree_multiset`.
+ using Base::cend;
+
+ // btree_multiset::empty()
+ //
+ // Returns whether or not the `btree_multiset` is empty.
+ using Base::empty;
+
+ // btree_multiset::max_size()
+ //
+ // Returns the largest theoretical possible number of elements within a
+ // `btree_multiset` under current memory constraints. This value can be
+ // thought of as the largest value of `std::distance(begin(), end())` for a
+ // `btree_multiset<Key>`.
+ using Base::max_size;
+
+ // btree_multiset::size()
+ //
+ // Returns the number of elements currently within the `btree_multiset`.
+ using Base::size;
+
+ // btree_multiset::clear()
+ //
+ // Removes all elements from the `btree_multiset`. Invalidates any references,
+ // pointers, or iterators referring to contained elements.
+ using Base::clear;
+
+ // btree_multiset::erase()
+ //
+ // Erases elements within the `btree_multiset`. Overloads are listed below.
+ //
+ // iterator erase(iterator position):
+ // iterator erase(const_iterator position):
+ //
+ // Erases the element at `position` of the `btree_multiset`, returning
+ // the iterator pointing to the element after the one that was erased
+ // (or end() if none exists).
+ //
+ // iterator erase(const_iterator first, const_iterator last):
+ //
+ // Erases the elements in the open interval [`first`, `last`), returning
+ // the iterator pointing to the element after the interval that was erased
+ // (or end() if none exists).
+ //
+ // template <typename K> size_type erase(const K& key):
+ //
+ // Erases the elements matching the key, if any exist, returning the
+ // number of elements erased.
+ using Base::erase;
+
+ // btree_multiset::insert()
+ //
+ // Inserts an element of the specified value into the `btree_multiset`,
+ // returning an iterator pointing to the newly inserted element.
+ // Any references, pointers, or iterators are invalidated. Overloads are
+ // listed below.
+ //
+ // iterator insert(const value_type& value):
+ //
+ // Inserts a value into the `btree_multiset`, returning an iterator to the
+ // inserted element.
+ //
+ // iterator insert(value_type&& value):
+ //
+ // Inserts a moveable value into the `btree_multiset`, returning an iterator
+ // to the inserted element.
+ //
+ // iterator insert(const_iterator hint, const value_type& value):
+ // iterator insert(const_iterator hint, value_type&& value):
+ //
+ // Inserts a value, using the position of `hint` as a non-binding suggestion
+ // for where to begin the insertion search. Returns an iterator to the
+ // inserted element.
+ //
+ // void insert(InputIterator first, InputIterator last):
+ //
+ // Inserts a range of values [`first`, `last`).
+ //
+ // void insert(std::initializer_list<init_type> ilist):
+ //
+ // Inserts the elements within the initializer list `ilist`.
+ using Base::insert;
+
+ // btree_multiset::emplace()
+ //
+ // Inserts an element of the specified value by constructing it in-place
+ // within the `btree_multiset`. Any references, pointers, or iterators are
+ // invalidated.
+ using Base::emplace;
+
+ // btree_multiset::emplace_hint()
+ //
+ // Inserts an element of the specified value by constructing it in-place
+ // within the `btree_multiset`, using the position of `hint` as a non-binding
+ // suggestion for where to begin the insertion search.
+ //
+ // Any references, pointers, or iterators are invalidated.
+ using Base::emplace_hint;
+
+ // btree_multiset::extract()
+ //
+ // Extracts the indicated element, erasing it in the process, and returns it
+ // as a C++17-compatible node handle. Overloads are listed below.
+ //
+ // node_type extract(const_iterator position):
+ //
+ // Extracts the element at the indicated position and returns a node handle
+ // owning that extracted data.
+ //
+ // template <typename K> node_type extract(const K& k):
+ //
+ // Extracts the element with the key matching the passed key value and
+ // returns a node handle owning that extracted data. If the `btree_multiset`
+ // does not contain an element with a matching key, this function returns an
+ // empty node handle.
+ //
+ // NOTE: In this context, `node_type` refers to the C++17 concept of a
+ // move-only type that owns and provides access to the elements in associative
+ // containers (https://en.cppreference.com/w/cpp/container/node_handle).
+ // It does NOT refer to the data layout of the underlying btree.
+ using Base::extract;
+
+ // btree_multiset::merge()
+ //
+ // Extracts elements from a given `source` btree_multiset into this
+ // `btree_multiset`. If the destination `btree_multiset` already contains an
+ // element with an equivalent key, that element is not extracted.
+ using Base::merge;
+
+ // btree_multiset::swap(btree_multiset& other)
+ //
+ // Exchanges the contents of this `btree_multiset` with those of the `other`
+ // btree_multiset, avoiding invocation of any move, copy, or swap operations
+ // on individual elements.
+ //
+ // All iterators and references on the `btree_multiset` remain valid,
+ // excepting for the past-the-end iterator, which is invalidated.
+ using Base::swap;
+
+ // btree_multiset::contains()
+ //
+ // template <typename K> bool contains(const K& key) const:
+ //
+ // Determines whether an element comparing equal to the given `key` exists
+ // within the `btree_multiset`, returning `true` if so or `false` otherwise.
+ //
+ // Supports heterogeneous lookup, provided that the set is provided a
+ // compatible heterogeneous comparator.
+ using Base::contains;
+
+ // btree_multiset::count()
+ //
+ // template <typename K> size_type count(const K& key) const:
+ //
+ // Returns the number of elements comparing equal to the given `key` within
+ // the `btree_multiset`.
+ //
+ // Supports heterogeneous lookup, provided that the set is provided a
+ // compatible heterogeneous comparator.
+ using Base::count;
+
+ // btree_multiset::equal_range()
+ //
+ // Returns a closed range [first, last], defined by a `std::pair` of two
+ // iterators, containing all elements with the passed key in the
+ // `btree_multiset`.
+ using Base::equal_range;
+
+ // btree_multiset::find()
+ //
+ // template <typename K> iterator find(const K& key):
+ // template <typename K> const_iterator find(const K& key) const:
+ //
+ // Finds an element with the passed `key` within the `btree_multiset`.
+ //
+ // Supports heterogeneous lookup, provided that the set is provided a
+ // compatible heterogeneous comparator.
+ using Base::find;
+
+ // btree_multiset::get_allocator()
+ //
+ // Returns the allocator function associated with this `btree_multiset`.
+ using Base::get_allocator;
+
+ // btree_multiset::key_comp();
+ //
+ // Returns the key comparator associated with this `btree_multiset`.
+ using Base::key_comp;
+
+ // btree_multiset::value_comp();
+ //
+ // Returns the value comparator associated with this `btree_multiset`. The
+ // keys to sort the elements are the values themselves, therefore `value_comp`
+ // and its sibling member function `key_comp` are equivalent.
+ using Base::value_comp;
+};
+
+// absl::swap(absl::btree_multiset<>, absl::btree_multiset<>)
+//
+// Swaps the contents of two `absl::btree_multiset` containers.
+template <typename K, typename C, typename A>
+void swap(btree_multiset<K, C, A> &x, btree_multiset<K, C, A> &y) {
+ return x.swap(y);
+}
+
+// absl::erase_if(absl::btree_multiset<>, Pred)
+//
+// Erases all elements that satisfy the predicate pred from the container.
+template <typename K, typename C, typename A, typename Pred>
+void erase_if(btree_multiset<K, C, A> &set, Pred pred) {
+ for (auto it = set.begin(); it != set.end();) {
+ if (pred(*it)) {
+ it = set.erase(it);
+ } else {
+ ++it;
+ }
+ }
+}
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_CONTAINER_BTREE_SET_H_
diff --git a/third_party/abseil/src/absl/container/btree_test.cc b/third_party/abseil/src/absl/container/btree_test.cc
new file mode 100644
index 0000000..9b1b643
--- /dev/null
+++ b/third_party/abseil/src/absl/container/btree_test.cc
@@ -0,0 +1,2827 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/container/btree_test.h"
+
+#include <cstdint>
+#include <limits>
+#include <map>
+#include <memory>
+#include <stdexcept>
+#include <string>
+#include <type_traits>
+#include <utility>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/base/internal/raw_logging.h"
+#include "absl/base/macros.h"
+#include "absl/container/btree_map.h"
+#include "absl/container/btree_set.h"
+#include "absl/container/internal/counting_allocator.h"
+#include "absl/container/internal/test_instance_tracker.h"
+#include "absl/flags/flag.h"
+#include "absl/hash/hash_testing.h"
+#include "absl/memory/memory.h"
+#include "absl/meta/type_traits.h"
+#include "absl/strings/str_cat.h"
+#include "absl/strings/str_split.h"
+#include "absl/strings/string_view.h"
+#include "absl/types/compare.h"
+
+ABSL_FLAG(int, test_values, 10000, "The number of values to use for tests");
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace container_internal {
+namespace {
+
+using ::absl::test_internal::CopyableMovableInstance;
+using ::absl::test_internal::InstanceTracker;
+using ::absl::test_internal::MovableOnlyInstance;
+using ::testing::ElementsAre;
+using ::testing::ElementsAreArray;
+using ::testing::IsEmpty;
+using ::testing::IsNull;
+using ::testing::Pair;
+using ::testing::SizeIs;
+
+template <typename T, typename U>
+void CheckPairEquals(const T &x, const U &y) {
+ ABSL_INTERNAL_CHECK(x == y, "Values are unequal.");
+}
+
+template <typename T, typename U, typename V, typename W>
+void CheckPairEquals(const std::pair<T, U> &x, const std::pair<V, W> &y) {
+ CheckPairEquals(x.first, y.first);
+ CheckPairEquals(x.second, y.second);
+}
+} // namespace
+
+// The base class for a sorted associative container checker. TreeType is the
+// container type to check and CheckerType is the container type to check
+// against. TreeType is expected to be btree_{set,map,multiset,multimap} and
+// CheckerType is expected to be {set,map,multiset,multimap}.
+template <typename TreeType, typename CheckerType>
+class base_checker {
+ public:
+ using key_type = typename TreeType::key_type;
+ using value_type = typename TreeType::value_type;
+ using key_compare = typename TreeType::key_compare;
+ using pointer = typename TreeType::pointer;
+ using const_pointer = typename TreeType::const_pointer;
+ using reference = typename TreeType::reference;
+ using const_reference = typename TreeType::const_reference;
+ using size_type = typename TreeType::size_type;
+ using difference_type = typename TreeType::difference_type;
+ using iterator = typename TreeType::iterator;
+ using const_iterator = typename TreeType::const_iterator;
+ using reverse_iterator = typename TreeType::reverse_iterator;
+ using const_reverse_iterator = typename TreeType::const_reverse_iterator;
+
+ public:
+ base_checker() : const_tree_(tree_) {}
+ base_checker(const base_checker &other)
+ : tree_(other.tree_), const_tree_(tree_), checker_(other.checker_) {}
+ template <typename InputIterator>
+ base_checker(InputIterator b, InputIterator e)
+ : tree_(b, e), const_tree_(tree_), checker_(b, e) {}
+
+ iterator begin() { return tree_.begin(); }
+ const_iterator begin() const { return tree_.begin(); }
+ iterator end() { return tree_.end(); }
+ const_iterator end() const { return tree_.end(); }
+ reverse_iterator rbegin() { return tree_.rbegin(); }
+ const_reverse_iterator rbegin() const { return tree_.rbegin(); }
+ reverse_iterator rend() { return tree_.rend(); }
+ const_reverse_iterator rend() const { return tree_.rend(); }
+
+ template <typename IterType, typename CheckerIterType>
+ IterType iter_check(IterType tree_iter, CheckerIterType checker_iter) const {
+ if (tree_iter == tree_.end()) {
+ ABSL_INTERNAL_CHECK(checker_iter == checker_.end(),
+ "Checker iterator not at end.");
+ } else {
+ CheckPairEquals(*tree_iter, *checker_iter);
+ }
+ return tree_iter;
+ }
+ template <typename IterType, typename CheckerIterType>
+ IterType riter_check(IterType tree_iter, CheckerIterType checker_iter) const {
+ if (tree_iter == tree_.rend()) {
+ ABSL_INTERNAL_CHECK(checker_iter == checker_.rend(),
+ "Checker iterator not at rend.");
+ } else {
+ CheckPairEquals(*tree_iter, *checker_iter);
+ }
+ return tree_iter;
+ }
+ void value_check(const value_type &v) {
+ typename KeyOfValue<typename TreeType::key_type,
+ typename TreeType::value_type>::type key_of_value;
+ const key_type &key = key_of_value(v);
+ CheckPairEquals(*find(key), v);
+ lower_bound(key);
+ upper_bound(key);
+ equal_range(key);
+ contains(key);
+ count(key);
+ }
+ void erase_check(const key_type &key) {
+ EXPECT_FALSE(tree_.contains(key));
+ EXPECT_EQ(tree_.find(key), const_tree_.end());
+ EXPECT_FALSE(const_tree_.contains(key));
+ EXPECT_EQ(const_tree_.find(key), tree_.end());
+ EXPECT_EQ(tree_.equal_range(key).first,
+ const_tree_.equal_range(key).second);
+ }
+
+ iterator lower_bound(const key_type &key) {
+ return iter_check(tree_.lower_bound(key), checker_.lower_bound(key));
+ }
+ const_iterator lower_bound(const key_type &key) const {
+ return iter_check(tree_.lower_bound(key), checker_.lower_bound(key));
+ }
+ iterator upper_bound(const key_type &key) {
+ return iter_check(tree_.upper_bound(key), checker_.upper_bound(key));
+ }
+ const_iterator upper_bound(const key_type &key) const {
+ return iter_check(tree_.upper_bound(key), checker_.upper_bound(key));
+ }
+ std::pair<iterator, iterator> equal_range(const key_type &key) {
+ std::pair<typename CheckerType::iterator, typename CheckerType::iterator>
+ checker_res = checker_.equal_range(key);
+ std::pair<iterator, iterator> tree_res = tree_.equal_range(key);
+ iter_check(tree_res.first, checker_res.first);
+ iter_check(tree_res.second, checker_res.second);
+ return tree_res;
+ }
+ std::pair<const_iterator, const_iterator> equal_range(
+ const key_type &key) const {
+ std::pair<typename CheckerType::const_iterator,
+ typename CheckerType::const_iterator>
+ checker_res = checker_.equal_range(key);
+ std::pair<const_iterator, const_iterator> tree_res = tree_.equal_range(key);
+ iter_check(tree_res.first, checker_res.first);
+ iter_check(tree_res.second, checker_res.second);
+ return tree_res;
+ }
+ iterator find(const key_type &key) {
+ return iter_check(tree_.find(key), checker_.find(key));
+ }
+ const_iterator find(const key_type &key) const {
+ return iter_check(tree_.find(key), checker_.find(key));
+ }
+ bool contains(const key_type &key) const { return find(key) != end(); }
+ size_type count(const key_type &key) const {
+ size_type res = checker_.count(key);
+ EXPECT_EQ(res, tree_.count(key));
+ return res;
+ }
+
+ base_checker &operator=(const base_checker &other) {
+ tree_ = other.tree_;
+ checker_ = other.checker_;
+ return *this;
+ }
+
+ int erase(const key_type &key) {
+ int size = tree_.size();
+ int res = checker_.erase(key);
+ EXPECT_EQ(res, tree_.count(key));
+ EXPECT_EQ(res, tree_.erase(key));
+ EXPECT_EQ(tree_.count(key), 0);
+ EXPECT_EQ(tree_.size(), size - res);
+ erase_check(key);
+ return res;
+ }
+ iterator erase(iterator iter) {
+ key_type key = iter.key();
+ int size = tree_.size();
+ int count = tree_.count(key);
+ auto checker_iter = checker_.lower_bound(key);
+ for (iterator tmp(tree_.lower_bound(key)); tmp != iter; ++tmp) {
+ ++checker_iter;
+ }
+ auto checker_next = checker_iter;
+ ++checker_next;
+ checker_.erase(checker_iter);
+ iter = tree_.erase(iter);
+ EXPECT_EQ(tree_.size(), checker_.size());
+ EXPECT_EQ(tree_.size(), size - 1);
+ EXPECT_EQ(tree_.count(key), count - 1);
+ if (count == 1) {
+ erase_check(key);
+ }
+ return iter_check(iter, checker_next);
+ }
+
+ void erase(iterator begin, iterator end) {
+ int size = tree_.size();
+ int count = std::distance(begin, end);
+ auto checker_begin = checker_.lower_bound(begin.key());
+ for (iterator tmp(tree_.lower_bound(begin.key())); tmp != begin; ++tmp) {
+ ++checker_begin;
+ }
+ auto checker_end =
+ end == tree_.end() ? checker_.end() : checker_.lower_bound(end.key());
+ if (end != tree_.end()) {
+ for (iterator tmp(tree_.lower_bound(end.key())); tmp != end; ++tmp) {
+ ++checker_end;
+ }
+ }
+ const auto checker_ret = checker_.erase(checker_begin, checker_end);
+ const auto tree_ret = tree_.erase(begin, end);
+ EXPECT_EQ(std::distance(checker_.begin(), checker_ret),
+ std::distance(tree_.begin(), tree_ret));
+ EXPECT_EQ(tree_.size(), checker_.size());
+ EXPECT_EQ(tree_.size(), size - count);
+ }
+
+ void clear() {
+ tree_.clear();
+ checker_.clear();
+ }
+ void swap(base_checker &other) {
+ tree_.swap(other.tree_);
+ checker_.swap(other.checker_);
+ }
+
+ void verify() const {
+ tree_.verify();
+ EXPECT_EQ(tree_.size(), checker_.size());
+
+ // Move through the forward iterators using increment.
+ auto checker_iter = checker_.begin();
+ const_iterator tree_iter(tree_.begin());
+ for (; tree_iter != tree_.end(); ++tree_iter, ++checker_iter) {
+ CheckPairEquals(*tree_iter, *checker_iter);
+ }
+
+ // Move through the forward iterators using decrement.
+ for (int n = tree_.size() - 1; n >= 0; --n) {
+ iter_check(tree_iter, checker_iter);
+ --tree_iter;
+ --checker_iter;
+ }
+ EXPECT_EQ(tree_iter, tree_.begin());
+ EXPECT_EQ(checker_iter, checker_.begin());
+
+ // Move through the reverse iterators using increment.
+ auto checker_riter = checker_.rbegin();
+ const_reverse_iterator tree_riter(tree_.rbegin());
+ for (; tree_riter != tree_.rend(); ++tree_riter, ++checker_riter) {
+ CheckPairEquals(*tree_riter, *checker_riter);
+ }
+
+ // Move through the reverse iterators using decrement.
+ for (int n = tree_.size() - 1; n >= 0; --n) {
+ riter_check(tree_riter, checker_riter);
+ --tree_riter;
+ --checker_riter;
+ }
+ EXPECT_EQ(tree_riter, tree_.rbegin());
+ EXPECT_EQ(checker_riter, checker_.rbegin());
+ }
+
+ const TreeType &tree() const { return tree_; }
+
+ size_type size() const {
+ EXPECT_EQ(tree_.size(), checker_.size());
+ return tree_.size();
+ }
+ size_type max_size() const { return tree_.max_size(); }
+ bool empty() const {
+ EXPECT_EQ(tree_.empty(), checker_.empty());
+ return tree_.empty();
+ }
+
+ protected:
+ TreeType tree_;
+ const TreeType &const_tree_;
+ CheckerType checker_;
+};
+
+namespace {
+// A checker for unique sorted associative containers. TreeType is expected to
+// be btree_{set,map} and CheckerType is expected to be {set,map}.
+template <typename TreeType, typename CheckerType>
+class unique_checker : public base_checker<TreeType, CheckerType> {
+ using super_type = base_checker<TreeType, CheckerType>;
+
+ public:
+ using iterator = typename super_type::iterator;
+ using value_type = typename super_type::value_type;
+
+ public:
+ unique_checker() : super_type() {}
+ unique_checker(const unique_checker &other) : super_type(other) {}
+ template <class InputIterator>
+ unique_checker(InputIterator b, InputIterator e) : super_type(b, e) {}
+ unique_checker &operator=(const unique_checker &) = default;
+
+ // Insertion routines.
+ std::pair<iterator, bool> insert(const value_type &v) {
+ int size = this->tree_.size();
+ std::pair<typename CheckerType::iterator, bool> checker_res =
+ this->checker_.insert(v);
+ std::pair<iterator, bool> tree_res = this->tree_.insert(v);
+ CheckPairEquals(*tree_res.first, *checker_res.first);
+ EXPECT_EQ(tree_res.second, checker_res.second);
+ EXPECT_EQ(this->tree_.size(), this->checker_.size());
+ EXPECT_EQ(this->tree_.size(), size + tree_res.second);
+ return tree_res;
+ }
+ iterator insert(iterator position, const value_type &v) {
+ int size = this->tree_.size();
+ std::pair<typename CheckerType::iterator, bool> checker_res =
+ this->checker_.insert(v);
+ iterator tree_res = this->tree_.insert(position, v);
+ CheckPairEquals(*tree_res, *checker_res.first);
+ EXPECT_EQ(this->tree_.size(), this->checker_.size());
+ EXPECT_EQ(this->tree_.size(), size + checker_res.second);
+ return tree_res;
+ }
+ template <typename InputIterator>
+ void insert(InputIterator b, InputIterator e) {
+ for (; b != e; ++b) {
+ insert(*b);
+ }
+ }
+};
+
+// A checker for multiple sorted associative containers. TreeType is expected
+// to be btree_{multiset,multimap} and CheckerType is expected to be
+// {multiset,multimap}.
+template <typename TreeType, typename CheckerType>
+class multi_checker : public base_checker<TreeType, CheckerType> {
+ using super_type = base_checker<TreeType, CheckerType>;
+
+ public:
+ using iterator = typename super_type::iterator;
+ using value_type = typename super_type::value_type;
+
+ public:
+ multi_checker() : super_type() {}
+ multi_checker(const multi_checker &other) : super_type(other) {}
+ template <class InputIterator>
+ multi_checker(InputIterator b, InputIterator e) : super_type(b, e) {}
+ multi_checker &operator=(const multi_checker &) = default;
+
+ // Insertion routines.
+ iterator insert(const value_type &v) {
+ int size = this->tree_.size();
+ auto checker_res = this->checker_.insert(v);
+ iterator tree_res = this->tree_.insert(v);
+ CheckPairEquals(*tree_res, *checker_res);
+ EXPECT_EQ(this->tree_.size(), this->checker_.size());
+ EXPECT_EQ(this->tree_.size(), size + 1);
+ return tree_res;
+ }
+ iterator insert(iterator position, const value_type &v) {
+ int size = this->tree_.size();
+ auto checker_res = this->checker_.insert(v);
+ iterator tree_res = this->tree_.insert(position, v);
+ CheckPairEquals(*tree_res, *checker_res);
+ EXPECT_EQ(this->tree_.size(), this->checker_.size());
+ EXPECT_EQ(this->tree_.size(), size + 1);
+ return tree_res;
+ }
+ template <typename InputIterator>
+ void insert(InputIterator b, InputIterator e) {
+ for (; b != e; ++b) {
+ insert(*b);
+ }
+ }
+};
+
+template <typename T, typename V>
+void DoTest(const char *name, T *b, const std::vector<V> &values) {
+ typename KeyOfValue<typename T::key_type, V>::type key_of_value;
+
+ T &mutable_b = *b;
+ const T &const_b = *b;
+
+ // Test insert.
+ for (int i = 0; i < values.size(); ++i) {
+ mutable_b.insert(values[i]);
+ mutable_b.value_check(values[i]);
+ }
+ ASSERT_EQ(mutable_b.size(), values.size());
+
+ const_b.verify();
+
+ // Test copy constructor.
+ T b_copy(const_b);
+ EXPECT_EQ(b_copy.size(), const_b.size());
+ for (int i = 0; i < values.size(); ++i) {
+ CheckPairEquals(*b_copy.find(key_of_value(values[i])), values[i]);
+ }
+
+ // Test range constructor.
+ T b_range(const_b.begin(), const_b.end());
+ EXPECT_EQ(b_range.size(), const_b.size());
+ for (int i = 0; i < values.size(); ++i) {
+ CheckPairEquals(*b_range.find(key_of_value(values[i])), values[i]);
+ }
+
+ // Test range insertion for values that already exist.
+ b_range.insert(b_copy.begin(), b_copy.end());
+ b_range.verify();
+
+ // Test range insertion for new values.
+ b_range.clear();
+ b_range.insert(b_copy.begin(), b_copy.end());
+ EXPECT_EQ(b_range.size(), b_copy.size());
+ for (int i = 0; i < values.size(); ++i) {
+ CheckPairEquals(*b_range.find(key_of_value(values[i])), values[i]);
+ }
+
+ // Test assignment to self. Nothing should change.
+ b_range.operator=(b_range);
+ EXPECT_EQ(b_range.size(), b_copy.size());
+
+ // Test assignment of new values.
+ b_range.clear();
+ b_range = b_copy;
+ EXPECT_EQ(b_range.size(), b_copy.size());
+
+ // Test swap.
+ b_range.clear();
+ b_range.swap(b_copy);
+ EXPECT_EQ(b_copy.size(), 0);
+ EXPECT_EQ(b_range.size(), const_b.size());
+ for (int i = 0; i < values.size(); ++i) {
+ CheckPairEquals(*b_range.find(key_of_value(values[i])), values[i]);
+ }
+ b_range.swap(b_copy);
+
+ // Test non-member function swap.
+ swap(b_range, b_copy);
+ EXPECT_EQ(b_copy.size(), 0);
+ EXPECT_EQ(b_range.size(), const_b.size());
+ for (int i = 0; i < values.size(); ++i) {
+ CheckPairEquals(*b_range.find(key_of_value(values[i])), values[i]);
+ }
+ swap(b_range, b_copy);
+
+ // Test erase via values.
+ for (int i = 0; i < values.size(); ++i) {
+ mutable_b.erase(key_of_value(values[i]));
+ // Erasing a non-existent key should have no effect.
+ ASSERT_EQ(mutable_b.erase(key_of_value(values[i])), 0);
+ }
+
+ const_b.verify();
+ EXPECT_EQ(const_b.size(), 0);
+
+ // Test erase via iterators.
+ mutable_b = b_copy;
+ for (int i = 0; i < values.size(); ++i) {
+ mutable_b.erase(mutable_b.find(key_of_value(values[i])));
+ }
+
+ const_b.verify();
+ EXPECT_EQ(const_b.size(), 0);
+
+ // Test insert with hint.
+ for (int i = 0; i < values.size(); i++) {
+ mutable_b.insert(mutable_b.upper_bound(key_of_value(values[i])), values[i]);
+ }
+
+ const_b.verify();
+
+ // Test range erase.
+ mutable_b.erase(mutable_b.begin(), mutable_b.end());
+ EXPECT_EQ(mutable_b.size(), 0);
+ const_b.verify();
+
+ // First half.
+ mutable_b = b_copy;
+ typename T::iterator mutable_iter_end = mutable_b.begin();
+ for (int i = 0; i < values.size() / 2; ++i) ++mutable_iter_end;
+ mutable_b.erase(mutable_b.begin(), mutable_iter_end);
+ EXPECT_EQ(mutable_b.size(), values.size() - values.size() / 2);
+ const_b.verify();
+
+ // Second half.
+ mutable_b = b_copy;
+ typename T::iterator mutable_iter_begin = mutable_b.begin();
+ for (int i = 0; i < values.size() / 2; ++i) ++mutable_iter_begin;
+ mutable_b.erase(mutable_iter_begin, mutable_b.end());
+ EXPECT_EQ(mutable_b.size(), values.size() / 2);
+ const_b.verify();
+
+ // Second quarter.
+ mutable_b = b_copy;
+ mutable_iter_begin = mutable_b.begin();
+ for (int i = 0; i < values.size() / 4; ++i) ++mutable_iter_begin;
+ mutable_iter_end = mutable_iter_begin;
+ for (int i = 0; i < values.size() / 4; ++i) ++mutable_iter_end;
+ mutable_b.erase(mutable_iter_begin, mutable_iter_end);
+ EXPECT_EQ(mutable_b.size(), values.size() - values.size() / 4);
+ const_b.verify();
+
+ mutable_b.clear();
+}
+
+template <typename T>
+void ConstTest() {
+ using value_type = typename T::value_type;
+ typename KeyOfValue<typename T::key_type, value_type>::type key_of_value;
+
+ T mutable_b;
+ const T &const_b = mutable_b;
+
+ // Insert a single value into the container and test looking it up.
+ value_type value = Generator<value_type>(2)(2);
+ mutable_b.insert(value);
+ EXPECT_TRUE(mutable_b.contains(key_of_value(value)));
+ EXPECT_NE(mutable_b.find(key_of_value(value)), const_b.end());
+ EXPECT_TRUE(const_b.contains(key_of_value(value)));
+ EXPECT_NE(const_b.find(key_of_value(value)), mutable_b.end());
+ EXPECT_EQ(*const_b.lower_bound(key_of_value(value)), value);
+ EXPECT_EQ(const_b.upper_bound(key_of_value(value)), const_b.end());
+ EXPECT_EQ(*const_b.equal_range(key_of_value(value)).first, value);
+
+ // We can only create a non-const iterator from a non-const container.
+ typename T::iterator mutable_iter(mutable_b.begin());
+ EXPECT_EQ(mutable_iter, const_b.begin());
+ EXPECT_NE(mutable_iter, const_b.end());
+ EXPECT_EQ(const_b.begin(), mutable_iter);
+ EXPECT_NE(const_b.end(), mutable_iter);
+ typename T::reverse_iterator mutable_riter(mutable_b.rbegin());
+ EXPECT_EQ(mutable_riter, const_b.rbegin());
+ EXPECT_NE(mutable_riter, const_b.rend());
+ EXPECT_EQ(const_b.rbegin(), mutable_riter);
+ EXPECT_NE(const_b.rend(), mutable_riter);
+
+ // We can create a const iterator from a non-const iterator.
+ typename T::const_iterator const_iter(mutable_iter);
+ EXPECT_EQ(const_iter, mutable_b.begin());
+ EXPECT_NE(const_iter, mutable_b.end());
+ EXPECT_EQ(mutable_b.begin(), const_iter);
+ EXPECT_NE(mutable_b.end(), const_iter);
+ typename T::const_reverse_iterator const_riter(mutable_riter);
+ EXPECT_EQ(const_riter, mutable_b.rbegin());
+ EXPECT_NE(const_riter, mutable_b.rend());
+ EXPECT_EQ(mutable_b.rbegin(), const_riter);
+ EXPECT_NE(mutable_b.rend(), const_riter);
+
+ // Make sure various methods can be invoked on a const container.
+ const_b.verify();
+ ASSERT_TRUE(!const_b.empty());
+ EXPECT_EQ(const_b.size(), 1);
+ EXPECT_GT(const_b.max_size(), 0);
+ EXPECT_TRUE(const_b.contains(key_of_value(value)));
+ EXPECT_EQ(const_b.count(key_of_value(value)), 1);
+}
+
+template <typename T, typename C>
+void BtreeTest() {
+ ConstTest<T>();
+
+ using V = typename remove_pair_const<typename T::value_type>::type;
+ const std::vector<V> random_values = GenerateValuesWithSeed<V>(
+ absl::GetFlag(FLAGS_test_values), 4 * absl::GetFlag(FLAGS_test_values),
+ testing::GTEST_FLAG(random_seed));
+
+ unique_checker<T, C> container;
+
+ // Test key insertion/deletion in sorted order.
+ std::vector<V> sorted_values(random_values);
+ std::sort(sorted_values.begin(), sorted_values.end());
+ DoTest("sorted: ", &container, sorted_values);
+
+ // Test key insertion/deletion in reverse sorted order.
+ std::reverse(sorted_values.begin(), sorted_values.end());
+ DoTest("rsorted: ", &container, sorted_values);
+
+ // Test key insertion/deletion in random order.
+ DoTest("random: ", &container, random_values);
+}
+
+template <typename T, typename C>
+void BtreeMultiTest() {
+ ConstTest<T>();
+
+ using V = typename remove_pair_const<typename T::value_type>::type;
+ const std::vector<V> random_values = GenerateValuesWithSeed<V>(
+ absl::GetFlag(FLAGS_test_values), 4 * absl::GetFlag(FLAGS_test_values),
+ testing::GTEST_FLAG(random_seed));
+
+ multi_checker<T, C> container;
+
+ // Test keys in sorted order.
+ std::vector<V> sorted_values(random_values);
+ std::sort(sorted_values.begin(), sorted_values.end());
+ DoTest("sorted: ", &container, sorted_values);
+
+ // Test keys in reverse sorted order.
+ std::reverse(sorted_values.begin(), sorted_values.end());
+ DoTest("rsorted: ", &container, sorted_values);
+
+ // Test keys in random order.
+ DoTest("random: ", &container, random_values);
+
+ // Test keys in random order w/ duplicates.
+ std::vector<V> duplicate_values(random_values);
+ duplicate_values.insert(duplicate_values.end(), random_values.begin(),
+ random_values.end());
+ DoTest("duplicates:", &container, duplicate_values);
+
+ // Test all identical keys.
+ std::vector<V> identical_values(100);
+ std::fill(identical_values.begin(), identical_values.end(),
+ Generator<V>(2)(2));
+ DoTest("identical: ", &container, identical_values);
+}
+
+template <typename T>
+struct PropagatingCountingAlloc : public CountingAllocator<T> {
+ using propagate_on_container_copy_assignment = std::true_type;
+ using propagate_on_container_move_assignment = std::true_type;
+ using propagate_on_container_swap = std::true_type;
+
+ using Base = CountingAllocator<T>;
+ using Base::Base;
+
+ template <typename U>
+ explicit PropagatingCountingAlloc(const PropagatingCountingAlloc<U> &other)
+ : Base(other.bytes_used_) {}
+
+ template <typename U>
+ struct rebind {
+ using other = PropagatingCountingAlloc<U>;
+ };
+};
+
+template <typename T>
+void BtreeAllocatorTest() {
+ using value_type = typename T::value_type;
+
+ int64_t bytes1 = 0, bytes2 = 0;
+ PropagatingCountingAlloc<T> allocator1(&bytes1);
+ PropagatingCountingAlloc<T> allocator2(&bytes2);
+ Generator<value_type> generator(1000);
+
+ // Test that we allocate properly aligned memory. If we don't, then Layout
+ // will assert fail.
+ auto unused1 = allocator1.allocate(1);
+ auto unused2 = allocator2.allocate(1);
+
+ // Test copy assignment
+ {
+ T b1(typename T::key_compare(), allocator1);
+ T b2(typename T::key_compare(), allocator2);
+
+ int64_t original_bytes1 = bytes1;
+ b1.insert(generator(0));
+ EXPECT_GT(bytes1, original_bytes1);
+
+ // This should propagate the allocator.
+ b1 = b2;
+ EXPECT_EQ(b1.size(), 0);
+ EXPECT_EQ(b2.size(), 0);
+ EXPECT_EQ(bytes1, original_bytes1);
+
+ for (int i = 1; i < 1000; i++) {
+ b1.insert(generator(i));
+ }
+
+ // We should have allocated out of allocator2.
+ EXPECT_GT(bytes2, bytes1);
+ }
+
+ // Test move assignment
+ {
+ T b1(typename T::key_compare(), allocator1);
+ T b2(typename T::key_compare(), allocator2);
+
+ int64_t original_bytes1 = bytes1;
+ b1.insert(generator(0));
+ EXPECT_GT(bytes1, original_bytes1);
+
+ // This should propagate the allocator.
+ b1 = std::move(b2);
+ EXPECT_EQ(b1.size(), 0);
+ EXPECT_EQ(bytes1, original_bytes1);
+
+ for (int i = 1; i < 1000; i++) {
+ b1.insert(generator(i));
+ }
+
+ // We should have allocated out of allocator2.
+ EXPECT_GT(bytes2, bytes1);
+ }
+
+ // Test swap
+ {
+ T b1(typename T::key_compare(), allocator1);
+ T b2(typename T::key_compare(), allocator2);
+
+ int64_t original_bytes1 = bytes1;
+ b1.insert(generator(0));
+ EXPECT_GT(bytes1, original_bytes1);
+
+ // This should swap the allocators.
+ swap(b1, b2);
+ EXPECT_EQ(b1.size(), 0);
+ EXPECT_EQ(b2.size(), 1);
+ EXPECT_GT(bytes1, original_bytes1);
+
+ for (int i = 1; i < 1000; i++) {
+ b1.insert(generator(i));
+ }
+
+ // We should have allocated out of allocator2.
+ EXPECT_GT(bytes2, bytes1);
+ }
+
+ allocator1.deallocate(unused1, 1);
+ allocator2.deallocate(unused2, 1);
+}
+
+template <typename T>
+void BtreeMapTest() {
+ using value_type = typename T::value_type;
+ using mapped_type = typename T::mapped_type;
+
+ mapped_type m = Generator<mapped_type>(0)(0);
+ (void)m;
+
+ T b;
+
+ // Verify we can insert using operator[].
+ for (int i = 0; i < 1000; i++) {
+ value_type v = Generator<value_type>(1000)(i);
+ b[v.first] = v.second;
+ }
+ EXPECT_EQ(b.size(), 1000);
+
+ // Test whether we can use the "->" operator on iterators and
+ // reverse_iterators. This stresses the btree_map_params::pair_pointer
+ // mechanism.
+ EXPECT_EQ(b.begin()->first, Generator<value_type>(1000)(0).first);
+ EXPECT_EQ(b.begin()->second, Generator<value_type>(1000)(0).second);
+ EXPECT_EQ(b.rbegin()->first, Generator<value_type>(1000)(999).first);
+ EXPECT_EQ(b.rbegin()->second, Generator<value_type>(1000)(999).second);
+}
+
+template <typename T>
+void BtreeMultiMapTest() {
+ using mapped_type = typename T::mapped_type;
+ mapped_type m = Generator<mapped_type>(0)(0);
+ (void)m;
+}
+
+template <typename K, int N = 256>
+void SetTest() {
+ EXPECT_EQ(
+ sizeof(absl::btree_set<K>),
+ 2 * sizeof(void *) + sizeof(typename absl::btree_set<K>::size_type));
+ using BtreeSet = absl::btree_set<K>;
+ using CountingBtreeSet =
+ absl::btree_set<K, std::less<K>, PropagatingCountingAlloc<K>>;
+ BtreeTest<BtreeSet, std::set<K>>();
+ BtreeAllocatorTest<CountingBtreeSet>();
+}
+
+template <typename K, int N = 256>
+void MapTest() {
+ EXPECT_EQ(
+ sizeof(absl::btree_map<K, K>),
+ 2 * sizeof(void *) + sizeof(typename absl::btree_map<K, K>::size_type));
+ using BtreeMap = absl::btree_map<K, K>;
+ using CountingBtreeMap =
+ absl::btree_map<K, K, std::less<K>,
+ PropagatingCountingAlloc<std::pair<const K, K>>>;
+ BtreeTest<BtreeMap, std::map<K, K>>();
+ BtreeAllocatorTest<CountingBtreeMap>();
+ BtreeMapTest<BtreeMap>();
+}
+
+TEST(Btree, set_int32) { SetTest<int32_t>(); }
+TEST(Btree, set_int64) { SetTest<int64_t>(); }
+TEST(Btree, set_string) { SetTest<std::string>(); }
+TEST(Btree, set_cord) { SetTest<absl::Cord>(); }
+TEST(Btree, set_pair) { SetTest<std::pair<int, int>>(); }
+TEST(Btree, map_int32) { MapTest<int32_t>(); }
+TEST(Btree, map_int64) { MapTest<int64_t>(); }
+TEST(Btree, map_string) { MapTest<std::string>(); }
+TEST(Btree, map_cord) { MapTest<absl::Cord>(); }
+TEST(Btree, map_pair) { MapTest<std::pair<int, int>>(); }
+
+template <typename K, int N = 256>
+void MultiSetTest() {
+ EXPECT_EQ(
+ sizeof(absl::btree_multiset<K>),
+ 2 * sizeof(void *) + sizeof(typename absl::btree_multiset<K>::size_type));
+ using BtreeMSet = absl::btree_multiset<K>;
+ using CountingBtreeMSet =
+ absl::btree_multiset<K, std::less<K>, PropagatingCountingAlloc<K>>;
+ BtreeMultiTest<BtreeMSet, std::multiset<K>>();
+ BtreeAllocatorTest<CountingBtreeMSet>();
+}
+
+template <typename K, int N = 256>
+void MultiMapTest() {
+ EXPECT_EQ(sizeof(absl::btree_multimap<K, K>),
+ 2 * sizeof(void *) +
+ sizeof(typename absl::btree_multimap<K, K>::size_type));
+ using BtreeMMap = absl::btree_multimap<K, K>;
+ using CountingBtreeMMap =
+ absl::btree_multimap<K, K, std::less<K>,
+ PropagatingCountingAlloc<std::pair<const K, K>>>;
+ BtreeMultiTest<BtreeMMap, std::multimap<K, K>>();
+ BtreeMultiMapTest<BtreeMMap>();
+ BtreeAllocatorTest<CountingBtreeMMap>();
+}
+
+TEST(Btree, multiset_int32) { MultiSetTest<int32_t>(); }
+TEST(Btree, multiset_int64) { MultiSetTest<int64_t>(); }
+TEST(Btree, multiset_string) { MultiSetTest<std::string>(); }
+TEST(Btree, multiset_cord) { MultiSetTest<absl::Cord>(); }
+TEST(Btree, multiset_pair) { MultiSetTest<std::pair<int, int>>(); }
+TEST(Btree, multimap_int32) { MultiMapTest<int32_t>(); }
+TEST(Btree, multimap_int64) { MultiMapTest<int64_t>(); }
+TEST(Btree, multimap_string) { MultiMapTest<std::string>(); }
+TEST(Btree, multimap_cord) { MultiMapTest<absl::Cord>(); }
+TEST(Btree, multimap_pair) { MultiMapTest<std::pair<int, int>>(); }
+
+struct CompareIntToString {
+ bool operator()(const std::string &a, const std::string &b) const {
+ return a < b;
+ }
+ bool operator()(const std::string &a, int b) const {
+ return a < absl::StrCat(b);
+ }
+ bool operator()(int a, const std::string &b) const {
+ return absl::StrCat(a) < b;
+ }
+ using is_transparent = void;
+};
+
+struct NonTransparentCompare {
+ template <typename T, typename U>
+ bool operator()(const T &t, const U &u) const {
+ // Treating all comparators as transparent can cause inefficiencies (see
+ // N3657 C++ proposal). Test that for comparators without 'is_transparent'
+ // alias (like this one), we do not attempt heterogeneous lookup.
+ EXPECT_TRUE((std::is_same<T, U>()));
+ return t < u;
+ }
+};
+
+template <typename T>
+bool CanEraseWithEmptyBrace(T t, decltype(t.erase({})) *) {
+ return true;
+}
+
+template <typename T>
+bool CanEraseWithEmptyBrace(T, ...) {
+ return false;
+}
+
+template <typename T>
+void TestHeterogeneous(T table) {
+ auto lb = table.lower_bound("3");
+ EXPECT_EQ(lb, table.lower_bound(3));
+ EXPECT_NE(lb, table.lower_bound(4));
+ EXPECT_EQ(lb, table.lower_bound({"3"}));
+ EXPECT_NE(lb, table.lower_bound({}));
+
+ auto ub = table.upper_bound("3");
+ EXPECT_EQ(ub, table.upper_bound(3));
+ EXPECT_NE(ub, table.upper_bound(5));
+ EXPECT_EQ(ub, table.upper_bound({"3"}));
+ EXPECT_NE(ub, table.upper_bound({}));
+
+ auto er = table.equal_range("3");
+ EXPECT_EQ(er, table.equal_range(3));
+ EXPECT_NE(er, table.equal_range(4));
+ EXPECT_EQ(er, table.equal_range({"3"}));
+ EXPECT_NE(er, table.equal_range({}));
+
+ auto it = table.find("3");
+ EXPECT_EQ(it, table.find(3));
+ EXPECT_NE(it, table.find(4));
+ EXPECT_EQ(it, table.find({"3"}));
+ EXPECT_NE(it, table.find({}));
+
+ EXPECT_TRUE(table.contains(3));
+ EXPECT_FALSE(table.contains(4));
+ EXPECT_TRUE(table.count({"3"}));
+ EXPECT_FALSE(table.contains({}));
+
+ EXPECT_EQ(1, table.count(3));
+ EXPECT_EQ(0, table.count(4));
+ EXPECT_EQ(1, table.count({"3"}));
+ EXPECT_EQ(0, table.count({}));
+
+ auto copy = table;
+ copy.erase(3);
+ EXPECT_EQ(table.size() - 1, copy.size());
+ copy.erase(4);
+ EXPECT_EQ(table.size() - 1, copy.size());
+ copy.erase({"5"});
+ EXPECT_EQ(table.size() - 2, copy.size());
+ EXPECT_FALSE(CanEraseWithEmptyBrace(table, nullptr));
+
+ // Also run it with const T&.
+ if (std::is_class<T>()) TestHeterogeneous<const T &>(table);
+}
+
+TEST(Btree, HeterogeneousLookup) {
+ TestHeterogeneous(btree_set<std::string, CompareIntToString>{"1", "3", "5"});
+ TestHeterogeneous(btree_map<std::string, int, CompareIntToString>{
+ {"1", 1}, {"3", 3}, {"5", 5}});
+ TestHeterogeneous(
+ btree_multiset<std::string, CompareIntToString>{"1", "3", "5"});
+ TestHeterogeneous(btree_multimap<std::string, int, CompareIntToString>{
+ {"1", 1}, {"3", 3}, {"5", 5}});
+
+ // Only maps have .at()
+ btree_map<std::string, int, CompareIntToString> map{
+ {"", -1}, {"1", 1}, {"3", 3}, {"5", 5}};
+ EXPECT_EQ(1, map.at(1));
+ EXPECT_EQ(3, map.at({"3"}));
+ EXPECT_EQ(-1, map.at({}));
+ const auto &cmap = map;
+ EXPECT_EQ(1, cmap.at(1));
+ EXPECT_EQ(3, cmap.at({"3"}));
+ EXPECT_EQ(-1, cmap.at({}));
+}
+
+TEST(Btree, NoHeterogeneousLookupWithoutAlias) {
+ using StringSet = absl::btree_set<std::string, NonTransparentCompare>;
+ StringSet s;
+ ASSERT_TRUE(s.insert("hello").second);
+ ASSERT_TRUE(s.insert("world").second);
+ EXPECT_TRUE(s.end() == s.find("blah"));
+ EXPECT_TRUE(s.begin() == s.lower_bound("hello"));
+ EXPECT_EQ(1, s.count("world"));
+ EXPECT_TRUE(s.contains("hello"));
+ EXPECT_TRUE(s.contains("world"));
+ EXPECT_FALSE(s.contains("blah"));
+
+ using StringMultiSet =
+ absl::btree_multiset<std::string, NonTransparentCompare>;
+ StringMultiSet ms;
+ ms.insert("hello");
+ ms.insert("world");
+ ms.insert("world");
+ EXPECT_TRUE(ms.end() == ms.find("blah"));
+ EXPECT_TRUE(ms.begin() == ms.lower_bound("hello"));
+ EXPECT_EQ(2, ms.count("world"));
+ EXPECT_TRUE(ms.contains("hello"));
+ EXPECT_TRUE(ms.contains("world"));
+ EXPECT_FALSE(ms.contains("blah"));
+}
+
+TEST(Btree, DefaultTransparent) {
+ {
+ // `int` does not have a default transparent comparator.
+ // The input value is converted to key_type.
+ btree_set<int> s = {1};
+ double d = 1.1;
+ EXPECT_EQ(s.begin(), s.find(d));
+ EXPECT_TRUE(s.contains(d));
+ }
+
+ {
+ // `std::string` has heterogeneous support.
+ btree_set<std::string> s = {"A"};
+ EXPECT_EQ(s.begin(), s.find(absl::string_view("A")));
+ EXPECT_TRUE(s.contains(absl::string_view("A")));
+ }
+}
+
+class StringLike {
+ public:
+ StringLike() = default;
+
+ StringLike(const char *s) : s_(s) { // NOLINT
+ ++constructor_calls_;
+ }
+
+ bool operator<(const StringLike &a) const { return s_ < a.s_; }
+
+ static void clear_constructor_call_count() { constructor_calls_ = 0; }
+
+ static int constructor_calls() { return constructor_calls_; }
+
+ private:
+ static int constructor_calls_;
+ std::string s_;
+};
+
+int StringLike::constructor_calls_ = 0;
+
+TEST(Btree, HeterogeneousLookupDoesntDegradePerformance) {
+ using StringSet = absl::btree_set<StringLike>;
+ StringSet s;
+ for (int i = 0; i < 100; ++i) {
+ ASSERT_TRUE(s.insert(absl::StrCat(i).c_str()).second);
+ }
+ StringLike::clear_constructor_call_count();
+ s.find("50");
+ ASSERT_EQ(1, StringLike::constructor_calls());
+
+ StringLike::clear_constructor_call_count();
+ s.contains("50");
+ ASSERT_EQ(1, StringLike::constructor_calls());
+
+ StringLike::clear_constructor_call_count();
+ s.count("50");
+ ASSERT_EQ(1, StringLike::constructor_calls());
+
+ StringLike::clear_constructor_call_count();
+ s.lower_bound("50");
+ ASSERT_EQ(1, StringLike::constructor_calls());
+
+ StringLike::clear_constructor_call_count();
+ s.upper_bound("50");
+ ASSERT_EQ(1, StringLike::constructor_calls());
+
+ StringLike::clear_constructor_call_count();
+ s.equal_range("50");
+ ASSERT_EQ(1, StringLike::constructor_calls());
+
+ StringLike::clear_constructor_call_count();
+ s.erase("50");
+ ASSERT_EQ(1, StringLike::constructor_calls());
+}
+
+// Verify that swapping btrees swaps the key comparison functors and that we can
+// use non-default constructible comparators.
+struct SubstringLess {
+ SubstringLess() = delete;
+ explicit SubstringLess(int length) : n(length) {}
+ bool operator()(const std::string &a, const std::string &b) const {
+ return absl::string_view(a).substr(0, n) <
+ absl::string_view(b).substr(0, n);
+ }
+ int n;
+};
+
+TEST(Btree, SwapKeyCompare) {
+ using SubstringSet = absl::btree_set<std::string, SubstringLess>;
+ SubstringSet s1(SubstringLess(1), SubstringSet::allocator_type());
+ SubstringSet s2(SubstringLess(2), SubstringSet::allocator_type());
+
+ ASSERT_TRUE(s1.insert("a").second);
+ ASSERT_FALSE(s1.insert("aa").second);
+
+ ASSERT_TRUE(s2.insert("a").second);
+ ASSERT_TRUE(s2.insert("aa").second);
+ ASSERT_FALSE(s2.insert("aaa").second);
+
+ swap(s1, s2);
+
+ ASSERT_TRUE(s1.insert("b").second);
+ ASSERT_TRUE(s1.insert("bb").second);
+ ASSERT_FALSE(s1.insert("bbb").second);
+
+ ASSERT_TRUE(s2.insert("b").second);
+ ASSERT_FALSE(s2.insert("bb").second);
+}
+
+TEST(Btree, UpperBoundRegression) {
+ // Regress a bug where upper_bound would default-construct a new key_compare
+ // instead of copying the existing one.
+ using SubstringSet = absl::btree_set<std::string, SubstringLess>;
+ SubstringSet my_set(SubstringLess(3));
+ my_set.insert("aab");
+ my_set.insert("abb");
+ // We call upper_bound("aaa"). If this correctly uses the length 3
+ // comparator, aaa < aab < abb, so we should get aab as the result.
+ // If it instead uses the default-constructed length 2 comparator,
+ // aa == aa < ab, so we'll get abb as our result.
+ SubstringSet::iterator it = my_set.upper_bound("aaa");
+ ASSERT_TRUE(it != my_set.end());
+ EXPECT_EQ("aab", *it);
+}
+
+TEST(Btree, Comparison) {
+ const int kSetSize = 1201;
+ absl::btree_set<int64_t> my_set;
+ for (int i = 0; i < kSetSize; ++i) {
+ my_set.insert(i);
+ }
+ absl::btree_set<int64_t> my_set_copy(my_set);
+ EXPECT_TRUE(my_set_copy == my_set);
+ EXPECT_TRUE(my_set == my_set_copy);
+ EXPECT_FALSE(my_set_copy != my_set);
+ EXPECT_FALSE(my_set != my_set_copy);
+
+ my_set.insert(kSetSize);
+ EXPECT_FALSE(my_set_copy == my_set);
+ EXPECT_FALSE(my_set == my_set_copy);
+ EXPECT_TRUE(my_set_copy != my_set);
+ EXPECT_TRUE(my_set != my_set_copy);
+
+ my_set.erase(kSetSize - 1);
+ EXPECT_FALSE(my_set_copy == my_set);
+ EXPECT_FALSE(my_set == my_set_copy);
+ EXPECT_TRUE(my_set_copy != my_set);
+ EXPECT_TRUE(my_set != my_set_copy);
+
+ absl::btree_map<std::string, int64_t> my_map;
+ for (int i = 0; i < kSetSize; ++i) {
+ my_map[std::string(i, 'a')] = i;
+ }
+ absl::btree_map<std::string, int64_t> my_map_copy(my_map);
+ EXPECT_TRUE(my_map_copy == my_map);
+ EXPECT_TRUE(my_map == my_map_copy);
+ EXPECT_FALSE(my_map_copy != my_map);
+ EXPECT_FALSE(my_map != my_map_copy);
+
+ ++my_map_copy[std::string(7, 'a')];
+ EXPECT_FALSE(my_map_copy == my_map);
+ EXPECT_FALSE(my_map == my_map_copy);
+ EXPECT_TRUE(my_map_copy != my_map);
+ EXPECT_TRUE(my_map != my_map_copy);
+
+ my_map_copy = my_map;
+ my_map["hello"] = kSetSize;
+ EXPECT_FALSE(my_map_copy == my_map);
+ EXPECT_FALSE(my_map == my_map_copy);
+ EXPECT_TRUE(my_map_copy != my_map);
+ EXPECT_TRUE(my_map != my_map_copy);
+
+ my_map.erase(std::string(kSetSize - 1, 'a'));
+ EXPECT_FALSE(my_map_copy == my_map);
+ EXPECT_FALSE(my_map == my_map_copy);
+ EXPECT_TRUE(my_map_copy != my_map);
+ EXPECT_TRUE(my_map != my_map_copy);
+}
+
+TEST(Btree, RangeCtorSanity) {
+ std::vector<int> ivec;
+ ivec.push_back(1);
+ std::map<int, int> imap;
+ imap.insert(std::make_pair(1, 2));
+ absl::btree_multiset<int> tmset(ivec.begin(), ivec.end());
+ absl::btree_multimap<int, int> tmmap(imap.begin(), imap.end());
+ absl::btree_set<int> tset(ivec.begin(), ivec.end());
+ absl::btree_map<int, int> tmap(imap.begin(), imap.end());
+ EXPECT_EQ(1, tmset.size());
+ EXPECT_EQ(1, tmmap.size());
+ EXPECT_EQ(1, tset.size());
+ EXPECT_EQ(1, tmap.size());
+}
+
+} // namespace
+
+class BtreeNodePeer {
+ public:
+ // Yields the size of a leaf node with a specific number of values.
+ template <typename ValueType>
+ constexpr static size_t GetTargetNodeSize(size_t target_values_per_node) {
+ return btree_node<
+ set_params<ValueType, std::less<ValueType>, std::allocator<ValueType>,
+ /*TargetNodeSize=*/256, // This parameter isn't used here.
+ /*Multi=*/false>>::SizeWithNValues(target_values_per_node);
+ }
+
+ // Yields the number of values in a (non-root) leaf node for this btree.
+ template <typename Btree>
+ constexpr static size_t GetNumValuesPerNode() {
+ return btree_node<typename Btree::params_type>::kNodeValues;
+ }
+
+ template <typename Btree>
+ constexpr static size_t GetMaxFieldType() {
+ return std::numeric_limits<
+ typename btree_node<typename Btree::params_type>::field_type>::max();
+ }
+
+ template <typename Btree>
+ constexpr static bool UsesLinearNodeSearch() {
+ return btree_node<typename Btree::params_type>::use_linear_search::value;
+ }
+};
+
+namespace {
+
+class BtreeMapTest : public ::testing::Test {
+ public:
+ struct Key {};
+ struct Cmp {
+ template <typename T>
+ bool operator()(T, T) const {
+ return false;
+ }
+ };
+
+ struct KeyLin {
+ using absl_btree_prefer_linear_node_search = std::true_type;
+ };
+ struct CmpLin : Cmp {
+ using absl_btree_prefer_linear_node_search = std::true_type;
+ };
+
+ struct KeyBin {
+ using absl_btree_prefer_linear_node_search = std::false_type;
+ };
+ struct CmpBin : Cmp {
+ using absl_btree_prefer_linear_node_search = std::false_type;
+ };
+
+ template <typename K, typename C>
+ static bool IsLinear() {
+ return BtreeNodePeer::UsesLinearNodeSearch<absl::btree_map<K, int, C>>();
+ }
+};
+
+TEST_F(BtreeMapTest, TestLinearSearchPreferredForKeyLinearViaAlias) {
+ // Test requesting linear search by directly exporting an alias.
+ EXPECT_FALSE((IsLinear<Key, Cmp>()));
+ EXPECT_TRUE((IsLinear<KeyLin, Cmp>()));
+ EXPECT_TRUE((IsLinear<Key, CmpLin>()));
+ EXPECT_TRUE((IsLinear<KeyLin, CmpLin>()));
+}
+
+TEST_F(BtreeMapTest, LinearChoiceTree) {
+ // Cmp has precedence, and is forcing binary
+ EXPECT_FALSE((IsLinear<Key, CmpBin>()));
+ EXPECT_FALSE((IsLinear<KeyLin, CmpBin>()));
+ EXPECT_FALSE((IsLinear<KeyBin, CmpBin>()));
+ EXPECT_FALSE((IsLinear<int, CmpBin>()));
+ EXPECT_FALSE((IsLinear<std::string, CmpBin>()));
+ // Cmp has precedence, and is forcing linear
+ EXPECT_TRUE((IsLinear<Key, CmpLin>()));
+ EXPECT_TRUE((IsLinear<KeyLin, CmpLin>()));
+ EXPECT_TRUE((IsLinear<KeyBin, CmpLin>()));
+ EXPECT_TRUE((IsLinear<int, CmpLin>()));
+ EXPECT_TRUE((IsLinear<std::string, CmpLin>()));
+ // Cmp has no preference, Key determines linear vs binary.
+ EXPECT_FALSE((IsLinear<Key, Cmp>()));
+ EXPECT_TRUE((IsLinear<KeyLin, Cmp>()));
+ EXPECT_FALSE((IsLinear<KeyBin, Cmp>()));
+ // arithmetic key w/ std::less or std::greater: linear
+ EXPECT_TRUE((IsLinear<int, std::less<int>>()));
+ EXPECT_TRUE((IsLinear<double, std::greater<double>>()));
+ // arithmetic key w/ custom compare: binary
+ EXPECT_FALSE((IsLinear<int, Cmp>()));
+ // non-arithmetic key: binary
+ EXPECT_FALSE((IsLinear<std::string, std::less<std::string>>()));
+}
+
+TEST(Btree, BtreeMapCanHoldMoveOnlyTypes) {
+ absl::btree_map<std::string, std::unique_ptr<std::string>> m;
+
+ std::unique_ptr<std::string> &v = m["A"];
+ EXPECT_TRUE(v == nullptr);
+ v.reset(new std::string("X"));
+
+ auto iter = m.find("A");
+ EXPECT_EQ("X", *iter->second);
+}
+
+TEST(Btree, InitializerListConstructor) {
+ absl::btree_set<std::string> set({"a", "b"});
+ EXPECT_EQ(set.count("a"), 1);
+ EXPECT_EQ(set.count("b"), 1);
+
+ absl::btree_multiset<int> mset({1, 1, 4});
+ EXPECT_EQ(mset.count(1), 2);
+ EXPECT_EQ(mset.count(4), 1);
+
+ absl::btree_map<int, int> map({{1, 5}, {2, 10}});
+ EXPECT_EQ(map[1], 5);
+ EXPECT_EQ(map[2], 10);
+
+ absl::btree_multimap<int, int> mmap({{1, 5}, {1, 10}});
+ auto range = mmap.equal_range(1);
+ auto it = range.first;
+ ASSERT_NE(it, range.second);
+ EXPECT_EQ(it->second, 5);
+ ASSERT_NE(++it, range.second);
+ EXPECT_EQ(it->second, 10);
+ EXPECT_EQ(++it, range.second);
+}
+
+TEST(Btree, InitializerListInsert) {
+ absl::btree_set<std::string> set;
+ set.insert({"a", "b"});
+ EXPECT_EQ(set.count("a"), 1);
+ EXPECT_EQ(set.count("b"), 1);
+
+ absl::btree_multiset<int> mset;
+ mset.insert({1, 1, 4});
+ EXPECT_EQ(mset.count(1), 2);
+ EXPECT_EQ(mset.count(4), 1);
+
+ absl::btree_map<int, int> map;
+ map.insert({{1, 5}, {2, 10}});
+ // Test that inserting one element using an initializer list also works.
+ map.insert({3, 15});
+ EXPECT_EQ(map[1], 5);
+ EXPECT_EQ(map[2], 10);
+ EXPECT_EQ(map[3], 15);
+
+ absl::btree_multimap<int, int> mmap;
+ mmap.insert({{1, 5}, {1, 10}});
+ auto range = mmap.equal_range(1);
+ auto it = range.first;
+ ASSERT_NE(it, range.second);
+ EXPECT_EQ(it->second, 5);
+ ASSERT_NE(++it, range.second);
+ EXPECT_EQ(it->second, 10);
+ EXPECT_EQ(++it, range.second);
+}
+
+template <typename Compare, typename K>
+void AssertKeyCompareToAdapted() {
+ using Adapted = typename key_compare_to_adapter<Compare>::type;
+ static_assert(!std::is_same<Adapted, Compare>::value,
+ "key_compare_to_adapter should have adapted this comparator.");
+ static_assert(
+ std::is_same<absl::weak_ordering,
+ absl::result_of_t<Adapted(const K &, const K &)>>::value,
+ "Adapted comparator should be a key-compare-to comparator.");
+}
+template <typename Compare, typename K>
+void AssertKeyCompareToNotAdapted() {
+ using Unadapted = typename key_compare_to_adapter<Compare>::type;
+ static_assert(
+ std::is_same<Unadapted, Compare>::value,
+ "key_compare_to_adapter shouldn't have adapted this comparator.");
+ static_assert(
+ std::is_same<bool,
+ absl::result_of_t<Unadapted(const K &, const K &)>>::value,
+ "Un-adapted comparator should return bool.");
+}
+
+TEST(Btree, KeyCompareToAdapter) {
+ AssertKeyCompareToAdapted<std::less<std::string>, std::string>();
+ AssertKeyCompareToAdapted<std::greater<std::string>, std::string>();
+ AssertKeyCompareToAdapted<std::less<absl::string_view>, absl::string_view>();
+ AssertKeyCompareToAdapted<std::greater<absl::string_view>,
+ absl::string_view>();
+ AssertKeyCompareToAdapted<std::less<absl::Cord>, absl::Cord>();
+ AssertKeyCompareToAdapted<std::greater<absl::Cord>, absl::Cord>();
+ AssertKeyCompareToNotAdapted<std::less<int>, int>();
+ AssertKeyCompareToNotAdapted<std::greater<int>, int>();
+}
+
+TEST(Btree, RValueInsert) {
+ InstanceTracker tracker;
+
+ absl::btree_set<MovableOnlyInstance> set;
+ set.insert(MovableOnlyInstance(1));
+ set.insert(MovableOnlyInstance(3));
+ MovableOnlyInstance two(2);
+ set.insert(set.find(MovableOnlyInstance(3)), std::move(two));
+ auto it = set.find(MovableOnlyInstance(2));
+ ASSERT_NE(it, set.end());
+ ASSERT_NE(++it, set.end());
+ EXPECT_EQ(it->value(), 3);
+
+ absl::btree_multiset<MovableOnlyInstance> mset;
+ MovableOnlyInstance zero(0);
+ MovableOnlyInstance zero2(0);
+ mset.insert(std::move(zero));
+ mset.insert(mset.find(MovableOnlyInstance(0)), std::move(zero2));
+ EXPECT_EQ(mset.count(MovableOnlyInstance(0)), 2);
+
+ absl::btree_map<int, MovableOnlyInstance> map;
+ std::pair<const int, MovableOnlyInstance> p1 = {1, MovableOnlyInstance(5)};
+ std::pair<const int, MovableOnlyInstance> p2 = {2, MovableOnlyInstance(10)};
+ std::pair<const int, MovableOnlyInstance> p3 = {3, MovableOnlyInstance(15)};
+ map.insert(std::move(p1));
+ map.insert(std::move(p3));
+ map.insert(map.find(3), std::move(p2));
+ ASSERT_NE(map.find(2), map.end());
+ EXPECT_EQ(map.find(2)->second.value(), 10);
+
+ absl::btree_multimap<int, MovableOnlyInstance> mmap;
+ std::pair<const int, MovableOnlyInstance> p4 = {1, MovableOnlyInstance(5)};
+ std::pair<const int, MovableOnlyInstance> p5 = {1, MovableOnlyInstance(10)};
+ mmap.insert(std::move(p4));
+ mmap.insert(mmap.find(1), std::move(p5));
+ auto range = mmap.equal_range(1);
+ auto it1 = range.first;
+ ASSERT_NE(it1, range.second);
+ EXPECT_EQ(it1->second.value(), 10);
+ ASSERT_NE(++it1, range.second);
+ EXPECT_EQ(it1->second.value(), 5);
+ EXPECT_EQ(++it1, range.second);
+
+ EXPECT_EQ(tracker.copies(), 0);
+ EXPECT_EQ(tracker.swaps(), 0);
+}
+
+// A btree set with a specific number of values per node.
+template <typename Key, int TargetValuesPerNode, typename Cmp = std::less<Key>>
+class SizedBtreeSet
+ : public btree_set_container<btree<
+ set_params<Key, Cmp, std::allocator<Key>,
+ BtreeNodePeer::GetTargetNodeSize<Key>(TargetValuesPerNode),
+ /*Multi=*/false>>> {
+ using Base = typename SizedBtreeSet::btree_set_container;
+
+ public:
+ SizedBtreeSet() {}
+ using Base::Base;
+};
+
+template <typename Set>
+void ExpectOperationCounts(const int expected_moves,
+ const int expected_comparisons,
+ const std::vector<int> &values,
+ InstanceTracker *tracker, Set *set) {
+ for (const int v : values) set->insert(MovableOnlyInstance(v));
+ set->clear();
+ EXPECT_EQ(tracker->moves(), expected_moves);
+ EXPECT_EQ(tracker->comparisons(), expected_comparisons);
+ EXPECT_EQ(tracker->copies(), 0);
+ EXPECT_EQ(tracker->swaps(), 0);
+ tracker->ResetCopiesMovesSwaps();
+}
+
+// Note: when the values in this test change, it is expected to have an impact
+// on performance.
+TEST(Btree, MovesComparisonsCopiesSwapsTracking) {
+ InstanceTracker tracker;
+ // Note: this is minimum number of values per node.
+ SizedBtreeSet<MovableOnlyInstance, /*TargetValuesPerNode=*/3> set3;
+ // Note: this is the default number of values per node for a set of int32s
+ // (with 64-bit pointers).
+ SizedBtreeSet<MovableOnlyInstance, /*TargetValuesPerNode=*/61> set61;
+ SizedBtreeSet<MovableOnlyInstance, /*TargetValuesPerNode=*/100> set100;
+
+ // Don't depend on flags for random values because then the expectations will
+ // fail if the flags change.
+ std::vector<int> values =
+ GenerateValuesWithSeed<int>(10000, 1 << 22, /*seed=*/23);
+
+ EXPECT_EQ(BtreeNodePeer::GetNumValuesPerNode<decltype(set3)>(), 3);
+ EXPECT_EQ(BtreeNodePeer::GetNumValuesPerNode<decltype(set61)>(), 61);
+ EXPECT_EQ(BtreeNodePeer::GetNumValuesPerNode<decltype(set100)>(), 100);
+ if (sizeof(void *) == 8) {
+ EXPECT_EQ(BtreeNodePeer::GetNumValuesPerNode<absl::btree_set<int32_t>>(),
+ BtreeNodePeer::GetNumValuesPerNode<decltype(set61)>());
+ }
+
+ // Test key insertion/deletion in random order.
+ ExpectOperationCounts(45281, 132551, values, &tracker, &set3);
+ ExpectOperationCounts(386718, 129807, values, &tracker, &set61);
+ ExpectOperationCounts(586761, 130310, values, &tracker, &set100);
+
+ // Test key insertion/deletion in sorted order.
+ std::sort(values.begin(), values.end());
+ ExpectOperationCounts(26638, 92134, values, &tracker, &set3);
+ ExpectOperationCounts(20208, 87757, values, &tracker, &set61);
+ ExpectOperationCounts(20124, 96583, values, &tracker, &set100);
+
+ // Test key insertion/deletion in reverse sorted order.
+ std::reverse(values.begin(), values.end());
+ ExpectOperationCounts(49951, 119325, values, &tracker, &set3);
+ ExpectOperationCounts(338813, 118266, values, &tracker, &set61);
+ ExpectOperationCounts(534529, 125279, values, &tracker, &set100);
+}
+
+struct MovableOnlyInstanceThreeWayCompare {
+ absl::weak_ordering operator()(const MovableOnlyInstance &a,
+ const MovableOnlyInstance &b) const {
+ return a.compare(b);
+ }
+};
+
+// Note: when the values in this test change, it is expected to have an impact
+// on performance.
+TEST(Btree, MovesComparisonsCopiesSwapsTrackingThreeWayCompare) {
+ InstanceTracker tracker;
+ // Note: this is minimum number of values per node.
+ SizedBtreeSet<MovableOnlyInstance, /*TargetValuesPerNode=*/3,
+ MovableOnlyInstanceThreeWayCompare>
+ set3;
+ // Note: this is the default number of values per node for a set of int32s
+ // (with 64-bit pointers).
+ SizedBtreeSet<MovableOnlyInstance, /*TargetValuesPerNode=*/61,
+ MovableOnlyInstanceThreeWayCompare>
+ set61;
+ SizedBtreeSet<MovableOnlyInstance, /*TargetValuesPerNode=*/100,
+ MovableOnlyInstanceThreeWayCompare>
+ set100;
+
+ // Don't depend on flags for random values because then the expectations will
+ // fail if the flags change.
+ std::vector<int> values =
+ GenerateValuesWithSeed<int>(10000, 1 << 22, /*seed=*/23);
+
+ EXPECT_EQ(BtreeNodePeer::GetNumValuesPerNode<decltype(set3)>(), 3);
+ EXPECT_EQ(BtreeNodePeer::GetNumValuesPerNode<decltype(set61)>(), 61);
+ EXPECT_EQ(BtreeNodePeer::GetNumValuesPerNode<decltype(set100)>(), 100);
+ if (sizeof(void *) == 8) {
+ EXPECT_EQ(BtreeNodePeer::GetNumValuesPerNode<absl::btree_set<int32_t>>(),
+ BtreeNodePeer::GetNumValuesPerNode<decltype(set61)>());
+ }
+
+ // Test key insertion/deletion in random order.
+ ExpectOperationCounts(45281, 122560, values, &tracker, &set3);
+ ExpectOperationCounts(386718, 119816, values, &tracker, &set61);
+ ExpectOperationCounts(586761, 120319, values, &tracker, &set100);
+
+ // Test key insertion/deletion in sorted order.
+ std::sort(values.begin(), values.end());
+ ExpectOperationCounts(26638, 92134, values, &tracker, &set3);
+ ExpectOperationCounts(20208, 87757, values, &tracker, &set61);
+ ExpectOperationCounts(20124, 96583, values, &tracker, &set100);
+
+ // Test key insertion/deletion in reverse sorted order.
+ std::reverse(values.begin(), values.end());
+ ExpectOperationCounts(49951, 109326, values, &tracker, &set3);
+ ExpectOperationCounts(338813, 108267, values, &tracker, &set61);
+ ExpectOperationCounts(534529, 115280, values, &tracker, &set100);
+}
+
+struct NoDefaultCtor {
+ int num;
+ explicit NoDefaultCtor(int i) : num(i) {}
+
+ friend bool operator<(const NoDefaultCtor &a, const NoDefaultCtor &b) {
+ return a.num < b.num;
+ }
+};
+
+TEST(Btree, BtreeMapCanHoldNoDefaultCtorTypes) {
+ absl::btree_map<NoDefaultCtor, NoDefaultCtor> m;
+
+ for (int i = 1; i <= 99; ++i) {
+ SCOPED_TRACE(i);
+ EXPECT_TRUE(m.emplace(NoDefaultCtor(i), NoDefaultCtor(100 - i)).second);
+ }
+ EXPECT_FALSE(m.emplace(NoDefaultCtor(78), NoDefaultCtor(0)).second);
+
+ auto iter99 = m.find(NoDefaultCtor(99));
+ ASSERT_NE(iter99, m.end());
+ EXPECT_EQ(iter99->second.num, 1);
+
+ auto iter1 = m.find(NoDefaultCtor(1));
+ ASSERT_NE(iter1, m.end());
+ EXPECT_EQ(iter1->second.num, 99);
+
+ auto iter50 = m.find(NoDefaultCtor(50));
+ ASSERT_NE(iter50, m.end());
+ EXPECT_EQ(iter50->second.num, 50);
+
+ auto iter25 = m.find(NoDefaultCtor(25));
+ ASSERT_NE(iter25, m.end());
+ EXPECT_EQ(iter25->second.num, 75);
+}
+
+TEST(Btree, BtreeMultimapCanHoldNoDefaultCtorTypes) {
+ absl::btree_multimap<NoDefaultCtor, NoDefaultCtor> m;
+
+ for (int i = 1; i <= 99; ++i) {
+ SCOPED_TRACE(i);
+ m.emplace(NoDefaultCtor(i), NoDefaultCtor(100 - i));
+ }
+
+ auto iter99 = m.find(NoDefaultCtor(99));
+ ASSERT_NE(iter99, m.end());
+ EXPECT_EQ(iter99->second.num, 1);
+
+ auto iter1 = m.find(NoDefaultCtor(1));
+ ASSERT_NE(iter1, m.end());
+ EXPECT_EQ(iter1->second.num, 99);
+
+ auto iter50 = m.find(NoDefaultCtor(50));
+ ASSERT_NE(iter50, m.end());
+ EXPECT_EQ(iter50->second.num, 50);
+
+ auto iter25 = m.find(NoDefaultCtor(25));
+ ASSERT_NE(iter25, m.end());
+ EXPECT_EQ(iter25->second.num, 75);
+}
+
+TEST(Btree, MapAt) {
+ absl::btree_map<int, int> map = {{1, 2}, {2, 4}};
+ EXPECT_EQ(map.at(1), 2);
+ EXPECT_EQ(map.at(2), 4);
+ map.at(2) = 8;
+ const absl::btree_map<int, int> &const_map = map;
+ EXPECT_EQ(const_map.at(1), 2);
+ EXPECT_EQ(const_map.at(2), 8);
+#ifdef ABSL_HAVE_EXCEPTIONS
+ EXPECT_THROW(map.at(3), std::out_of_range);
+#else
+ EXPECT_DEATH_IF_SUPPORTED(map.at(3), "absl::btree_map::at");
+#endif
+}
+
+TEST(Btree, BtreeMultisetEmplace) {
+ const int value_to_insert = 123456;
+ absl::btree_multiset<int> s;
+ auto iter = s.emplace(value_to_insert);
+ ASSERT_NE(iter, s.end());
+ EXPECT_EQ(*iter, value_to_insert);
+ auto iter2 = s.emplace(value_to_insert);
+ EXPECT_NE(iter2, iter);
+ ASSERT_NE(iter2, s.end());
+ EXPECT_EQ(*iter2, value_to_insert);
+ auto result = s.equal_range(value_to_insert);
+ EXPECT_EQ(std::distance(result.first, result.second), 2);
+}
+
+TEST(Btree, BtreeMultisetEmplaceHint) {
+ const int value_to_insert = 123456;
+ absl::btree_multiset<int> s;
+ auto iter = s.emplace(value_to_insert);
+ ASSERT_NE(iter, s.end());
+ EXPECT_EQ(*iter, value_to_insert);
+ auto emplace_iter = s.emplace_hint(iter, value_to_insert);
+ EXPECT_NE(emplace_iter, iter);
+ ASSERT_NE(emplace_iter, s.end());
+ EXPECT_EQ(*emplace_iter, value_to_insert);
+}
+
+TEST(Btree, BtreeMultimapEmplace) {
+ const int key_to_insert = 123456;
+ const char value0[] = "a";
+ absl::btree_multimap<int, std::string> s;
+ auto iter = s.emplace(key_to_insert, value0);
+ ASSERT_NE(iter, s.end());
+ EXPECT_EQ(iter->first, key_to_insert);
+ EXPECT_EQ(iter->second, value0);
+ const char value1[] = "b";
+ auto iter2 = s.emplace(key_to_insert, value1);
+ EXPECT_NE(iter2, iter);
+ ASSERT_NE(iter2, s.end());
+ EXPECT_EQ(iter2->first, key_to_insert);
+ EXPECT_EQ(iter2->second, value1);
+ auto result = s.equal_range(key_to_insert);
+ EXPECT_EQ(std::distance(result.first, result.second), 2);
+}
+
+TEST(Btree, BtreeMultimapEmplaceHint) {
+ const int key_to_insert = 123456;
+ const char value0[] = "a";
+ absl::btree_multimap<int, std::string> s;
+ auto iter = s.emplace(key_to_insert, value0);
+ ASSERT_NE(iter, s.end());
+ EXPECT_EQ(iter->first, key_to_insert);
+ EXPECT_EQ(iter->second, value0);
+ const char value1[] = "b";
+ auto emplace_iter = s.emplace_hint(iter, key_to_insert, value1);
+ EXPECT_NE(emplace_iter, iter);
+ ASSERT_NE(emplace_iter, s.end());
+ EXPECT_EQ(emplace_iter->first, key_to_insert);
+ EXPECT_EQ(emplace_iter->second, value1);
+}
+
+TEST(Btree, ConstIteratorAccessors) {
+ absl::btree_set<int> set;
+ for (int i = 0; i < 100; ++i) {
+ set.insert(i);
+ }
+
+ auto it = set.cbegin();
+ auto r_it = set.crbegin();
+ for (int i = 0; i < 100; ++i, ++it, ++r_it) {
+ ASSERT_EQ(*it, i);
+ ASSERT_EQ(*r_it, 99 - i);
+ }
+ EXPECT_EQ(it, set.cend());
+ EXPECT_EQ(r_it, set.crend());
+}
+
+TEST(Btree, StrSplitCompatible) {
+ const absl::btree_set<std::string> split_set = absl::StrSplit("a,b,c", ',');
+ const absl::btree_set<std::string> expected_set = {"a", "b", "c"};
+
+ EXPECT_EQ(split_set, expected_set);
+}
+
+// We can't use EXPECT_EQ/etc. to compare absl::weak_ordering because they
+// convert literal 0 to int and absl::weak_ordering can only be compared with
+// literal 0. Defining this function allows for avoiding ClangTidy warnings.
+bool Identity(const bool b) { return b; }
+
+TEST(Btree, ValueComp) {
+ absl::btree_set<int> s;
+ EXPECT_TRUE(s.value_comp()(1, 2));
+ EXPECT_FALSE(s.value_comp()(2, 2));
+ EXPECT_FALSE(s.value_comp()(2, 1));
+
+ absl::btree_map<int, int> m1;
+ EXPECT_TRUE(m1.value_comp()(std::make_pair(1, 0), std::make_pair(2, 0)));
+ EXPECT_FALSE(m1.value_comp()(std::make_pair(2, 0), std::make_pair(2, 0)));
+ EXPECT_FALSE(m1.value_comp()(std::make_pair(2, 0), std::make_pair(1, 0)));
+
+ absl::btree_map<std::string, int> m2;
+ EXPECT_TRUE(Identity(
+ m2.value_comp()(std::make_pair("a", 0), std::make_pair("b", 0)) < 0));
+ EXPECT_TRUE(Identity(
+ m2.value_comp()(std::make_pair("b", 0), std::make_pair("b", 0)) == 0));
+ EXPECT_TRUE(Identity(
+ m2.value_comp()(std::make_pair("b", 0), std::make_pair("a", 0)) > 0));
+}
+
+TEST(Btree, DefaultConstruction) {
+ absl::btree_set<int> s;
+ absl::btree_map<int, int> m;
+ absl::btree_multiset<int> ms;
+ absl::btree_multimap<int, int> mm;
+
+ EXPECT_TRUE(s.empty());
+ EXPECT_TRUE(m.empty());
+ EXPECT_TRUE(ms.empty());
+ EXPECT_TRUE(mm.empty());
+}
+
+TEST(Btree, SwissTableHashable) {
+ static constexpr int kValues = 10000;
+ std::vector<int> values(kValues);
+ std::iota(values.begin(), values.end(), 0);
+ std::vector<std::pair<int, int>> map_values;
+ for (int v : values) map_values.emplace_back(v, -v);
+
+ using set = absl::btree_set<int>;
+ EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly({
+ set{},
+ set{1},
+ set{2},
+ set{1, 2},
+ set{2, 1},
+ set(values.begin(), values.end()),
+ set(values.rbegin(), values.rend()),
+ }));
+
+ using mset = absl::btree_multiset<int>;
+ EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly({
+ mset{},
+ mset{1},
+ mset{1, 1},
+ mset{2},
+ mset{2, 2},
+ mset{1, 2},
+ mset{1, 1, 2},
+ mset{1, 2, 2},
+ mset{1, 1, 2, 2},
+ mset(values.begin(), values.end()),
+ mset(values.rbegin(), values.rend()),
+ }));
+
+ using map = absl::btree_map<int, int>;
+ EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly({
+ map{},
+ map{{1, 0}},
+ map{{1, 1}},
+ map{{2, 0}},
+ map{{2, 2}},
+ map{{1, 0}, {2, 1}},
+ map(map_values.begin(), map_values.end()),
+ map(map_values.rbegin(), map_values.rend()),
+ }));
+
+ using mmap = absl::btree_multimap<int, int>;
+ EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly({
+ mmap{},
+ mmap{{1, 0}},
+ mmap{{1, 1}},
+ mmap{{1, 0}, {1, 1}},
+ mmap{{1, 1}, {1, 0}},
+ mmap{{2, 0}},
+ mmap{{2, 2}},
+ mmap{{1, 0}, {2, 1}},
+ mmap(map_values.begin(), map_values.end()),
+ mmap(map_values.rbegin(), map_values.rend()),
+ }));
+}
+
+TEST(Btree, ComparableSet) {
+ absl::btree_set<int> s1 = {1, 2};
+ absl::btree_set<int> s2 = {2, 3};
+ EXPECT_LT(s1, s2);
+ EXPECT_LE(s1, s2);
+ EXPECT_LE(s1, s1);
+ EXPECT_GT(s2, s1);
+ EXPECT_GE(s2, s1);
+ EXPECT_GE(s1, s1);
+}
+
+TEST(Btree, ComparableSetsDifferentLength) {
+ absl::btree_set<int> s1 = {1, 2};
+ absl::btree_set<int> s2 = {1, 2, 3};
+ EXPECT_LT(s1, s2);
+ EXPECT_LE(s1, s2);
+ EXPECT_GT(s2, s1);
+ EXPECT_GE(s2, s1);
+}
+
+TEST(Btree, ComparableMultiset) {
+ absl::btree_multiset<int> s1 = {1, 2};
+ absl::btree_multiset<int> s2 = {2, 3};
+ EXPECT_LT(s1, s2);
+ EXPECT_LE(s1, s2);
+ EXPECT_LE(s1, s1);
+ EXPECT_GT(s2, s1);
+ EXPECT_GE(s2, s1);
+ EXPECT_GE(s1, s1);
+}
+
+TEST(Btree, ComparableMap) {
+ absl::btree_map<int, int> s1 = {{1, 2}};
+ absl::btree_map<int, int> s2 = {{2, 3}};
+ EXPECT_LT(s1, s2);
+ EXPECT_LE(s1, s2);
+ EXPECT_LE(s1, s1);
+ EXPECT_GT(s2, s1);
+ EXPECT_GE(s2, s1);
+ EXPECT_GE(s1, s1);
+}
+
+TEST(Btree, ComparableMultimap) {
+ absl::btree_multimap<int, int> s1 = {{1, 2}};
+ absl::btree_multimap<int, int> s2 = {{2, 3}};
+ EXPECT_LT(s1, s2);
+ EXPECT_LE(s1, s2);
+ EXPECT_LE(s1, s1);
+ EXPECT_GT(s2, s1);
+ EXPECT_GE(s2, s1);
+ EXPECT_GE(s1, s1);
+}
+
+TEST(Btree, ComparableSetWithCustomComparator) {
+ // As specified by
+ // http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3337.pdf section
+ // [container.requirements.general].12, ordering associative containers always
+ // uses default '<' operator
+ // - even if otherwise the container uses custom functor.
+ absl::btree_set<int, std::greater<int>> s1 = {1, 2};
+ absl::btree_set<int, std::greater<int>> s2 = {2, 3};
+ EXPECT_LT(s1, s2);
+ EXPECT_LE(s1, s2);
+ EXPECT_LE(s1, s1);
+ EXPECT_GT(s2, s1);
+ EXPECT_GE(s2, s1);
+ EXPECT_GE(s1, s1);
+}
+
+TEST(Btree, EraseReturnsIterator) {
+ absl::btree_set<int> set = {1, 2, 3, 4, 5};
+ auto result_it = set.erase(set.begin(), set.find(3));
+ EXPECT_EQ(result_it, set.find(3));
+ result_it = set.erase(set.find(5));
+ EXPECT_EQ(result_it, set.end());
+}
+
+TEST(Btree, ExtractAndInsertNodeHandleSet) {
+ absl::btree_set<int> src1 = {1, 2, 3, 4, 5};
+ auto nh = src1.extract(src1.find(3));
+ EXPECT_THAT(src1, ElementsAre(1, 2, 4, 5));
+ absl::btree_set<int> other;
+ absl::btree_set<int>::insert_return_type res = other.insert(std::move(nh));
+ EXPECT_THAT(other, ElementsAre(3));
+ EXPECT_EQ(res.position, other.find(3));
+ EXPECT_TRUE(res.inserted);
+ EXPECT_TRUE(res.node.empty());
+
+ absl::btree_set<int> src2 = {3, 4};
+ nh = src2.extract(src2.find(3));
+ EXPECT_THAT(src2, ElementsAre(4));
+ res = other.insert(std::move(nh));
+ EXPECT_THAT(other, ElementsAre(3));
+ EXPECT_EQ(res.position, other.find(3));
+ EXPECT_FALSE(res.inserted);
+ ASSERT_FALSE(res.node.empty());
+ EXPECT_EQ(res.node.value(), 3);
+}
+
+template <typename Set>
+void TestExtractWithTrackingForSet() {
+ InstanceTracker tracker;
+ {
+ Set s;
+ // Add enough elements to make sure we test internal nodes too.
+ const size_t kSize = 1000;
+ while (s.size() < kSize) {
+ s.insert(MovableOnlyInstance(s.size()));
+ }
+ for (int i = 0; i < kSize; ++i) {
+ // Extract with key
+ auto nh = s.extract(MovableOnlyInstance(i));
+ EXPECT_EQ(s.size(), kSize - 1);
+ EXPECT_EQ(nh.value().value(), i);
+ // Insert with node
+ s.insert(std::move(nh));
+ EXPECT_EQ(s.size(), kSize);
+
+ // Extract with iterator
+ auto it = s.find(MovableOnlyInstance(i));
+ nh = s.extract(it);
+ EXPECT_EQ(s.size(), kSize - 1);
+ EXPECT_EQ(nh.value().value(), i);
+ // Insert with node and hint
+ s.insert(s.begin(), std::move(nh));
+ EXPECT_EQ(s.size(), kSize);
+ }
+ }
+ EXPECT_EQ(0, tracker.instances());
+}
+
+template <typename Map>
+void TestExtractWithTrackingForMap() {
+ InstanceTracker tracker;
+ {
+ Map m;
+ // Add enough elements to make sure we test internal nodes too.
+ const size_t kSize = 1000;
+ while (m.size() < kSize) {
+ m.insert(
+ {CopyableMovableInstance(m.size()), MovableOnlyInstance(m.size())});
+ }
+ for (int i = 0; i < kSize; ++i) {
+ // Extract with key
+ auto nh = m.extract(CopyableMovableInstance(i));
+ EXPECT_EQ(m.size(), kSize - 1);
+ EXPECT_EQ(nh.key().value(), i);
+ EXPECT_EQ(nh.mapped().value(), i);
+ // Insert with node
+ m.insert(std::move(nh));
+ EXPECT_EQ(m.size(), kSize);
+
+ // Extract with iterator
+ auto it = m.find(CopyableMovableInstance(i));
+ nh = m.extract(it);
+ EXPECT_EQ(m.size(), kSize - 1);
+ EXPECT_EQ(nh.key().value(), i);
+ EXPECT_EQ(nh.mapped().value(), i);
+ // Insert with node and hint
+ m.insert(m.begin(), std::move(nh));
+ EXPECT_EQ(m.size(), kSize);
+ }
+ }
+ EXPECT_EQ(0, tracker.instances());
+}
+
+TEST(Btree, ExtractTracking) {
+ TestExtractWithTrackingForSet<absl::btree_set<MovableOnlyInstance>>();
+ TestExtractWithTrackingForSet<absl::btree_multiset<MovableOnlyInstance>>();
+ TestExtractWithTrackingForMap<
+ absl::btree_map<CopyableMovableInstance, MovableOnlyInstance>>();
+ TestExtractWithTrackingForMap<
+ absl::btree_multimap<CopyableMovableInstance, MovableOnlyInstance>>();
+}
+
+TEST(Btree, ExtractAndInsertNodeHandleMultiSet) {
+ absl::btree_multiset<int> src1 = {1, 2, 3, 3, 4, 5};
+ auto nh = src1.extract(src1.find(3));
+ EXPECT_THAT(src1, ElementsAre(1, 2, 3, 4, 5));
+ absl::btree_multiset<int> other;
+ auto res = other.insert(std::move(nh));
+ EXPECT_THAT(other, ElementsAre(3));
+ EXPECT_EQ(res, other.find(3));
+
+ absl::btree_multiset<int> src2 = {3, 4};
+ nh = src2.extract(src2.find(3));
+ EXPECT_THAT(src2, ElementsAre(4));
+ res = other.insert(std::move(nh));
+ EXPECT_THAT(other, ElementsAre(3, 3));
+ EXPECT_EQ(res, ++other.find(3));
+}
+
+TEST(Btree, ExtractAndInsertNodeHandleMap) {
+ absl::btree_map<int, int> src1 = {{1, 2}, {3, 4}, {5, 6}};
+ auto nh = src1.extract(src1.find(3));
+ EXPECT_THAT(src1, ElementsAre(Pair(1, 2), Pair(5, 6)));
+ absl::btree_map<int, int> other;
+ absl::btree_map<int, int>::insert_return_type res =
+ other.insert(std::move(nh));
+ EXPECT_THAT(other, ElementsAre(Pair(3, 4)));
+ EXPECT_EQ(res.position, other.find(3));
+ EXPECT_TRUE(res.inserted);
+ EXPECT_TRUE(res.node.empty());
+
+ absl::btree_map<int, int> src2 = {{3, 6}};
+ nh = src2.extract(src2.find(3));
+ EXPECT_TRUE(src2.empty());
+ res = other.insert(std::move(nh));
+ EXPECT_THAT(other, ElementsAre(Pair(3, 4)));
+ EXPECT_EQ(res.position, other.find(3));
+ EXPECT_FALSE(res.inserted);
+ ASSERT_FALSE(res.node.empty());
+ EXPECT_EQ(res.node.key(), 3);
+ EXPECT_EQ(res.node.mapped(), 6);
+}
+
+TEST(Btree, ExtractAndInsertNodeHandleMultiMap) {
+ absl::btree_multimap<int, int> src1 = {{1, 2}, {3, 4}, {5, 6}};
+ auto nh = src1.extract(src1.find(3));
+ EXPECT_THAT(src1, ElementsAre(Pair(1, 2), Pair(5, 6)));
+ absl::btree_multimap<int, int> other;
+ auto res = other.insert(std::move(nh));
+ EXPECT_THAT(other, ElementsAre(Pair(3, 4)));
+ EXPECT_EQ(res, other.find(3));
+
+ absl::btree_multimap<int, int> src2 = {{3, 6}};
+ nh = src2.extract(src2.find(3));
+ EXPECT_TRUE(src2.empty());
+ res = other.insert(std::move(nh));
+ EXPECT_THAT(other, ElementsAre(Pair(3, 4), Pair(3, 6)));
+ EXPECT_EQ(res, ++other.begin());
+}
+
+// For multisets, insert with hint also affects correctness because we need to
+// insert immediately before the hint if possible.
+struct InsertMultiHintData {
+ int key;
+ int not_key;
+ bool operator==(const InsertMultiHintData other) const {
+ return key == other.key && not_key == other.not_key;
+ }
+};
+
+struct InsertMultiHintDataKeyCompare {
+ using is_transparent = void;
+ bool operator()(const InsertMultiHintData a,
+ const InsertMultiHintData b) const {
+ return a.key < b.key;
+ }
+ bool operator()(const int a, const InsertMultiHintData b) const {
+ return a < b.key;
+ }
+ bool operator()(const InsertMultiHintData a, const int b) const {
+ return a.key < b;
+ }
+};
+
+TEST(Btree, InsertHintNodeHandle) {
+ // For unique sets, insert with hint is just a performance optimization.
+ // Test that insert works correctly when the hint is right or wrong.
+ {
+ absl::btree_set<int> src = {1, 2, 3, 4, 5};
+ auto nh = src.extract(src.find(3));
+ EXPECT_THAT(src, ElementsAre(1, 2, 4, 5));
+ absl::btree_set<int> other = {0, 100};
+ // Test a correct hint.
+ auto it = other.insert(other.lower_bound(3), std::move(nh));
+ EXPECT_THAT(other, ElementsAre(0, 3, 100));
+ EXPECT_EQ(it, other.find(3));
+
+ nh = src.extract(src.find(5));
+ // Test an incorrect hint.
+ it = other.insert(other.end(), std::move(nh));
+ EXPECT_THAT(other, ElementsAre(0, 3, 5, 100));
+ EXPECT_EQ(it, other.find(5));
+ }
+
+ absl::btree_multiset<InsertMultiHintData, InsertMultiHintDataKeyCompare> src =
+ {{1, 2}, {3, 4}, {3, 5}};
+ auto nh = src.extract(src.lower_bound(3));
+ EXPECT_EQ(nh.value(), (InsertMultiHintData{3, 4}));
+ absl::btree_multiset<InsertMultiHintData, InsertMultiHintDataKeyCompare>
+ other = {{3, 1}, {3, 2}, {3, 3}};
+ auto it = other.insert(--other.end(), std::move(nh));
+ EXPECT_THAT(
+ other, ElementsAre(InsertMultiHintData{3, 1}, InsertMultiHintData{3, 2},
+ InsertMultiHintData{3, 4}, InsertMultiHintData{3, 3}));
+ EXPECT_EQ(it, --(--other.end()));
+
+ nh = src.extract(src.find(3));
+ EXPECT_EQ(nh.value(), (InsertMultiHintData{3, 5}));
+ it = other.insert(other.begin(), std::move(nh));
+ EXPECT_THAT(other,
+ ElementsAre(InsertMultiHintData{3, 5}, InsertMultiHintData{3, 1},
+ InsertMultiHintData{3, 2}, InsertMultiHintData{3, 4},
+ InsertMultiHintData{3, 3}));
+ EXPECT_EQ(it, other.begin());
+}
+
+struct IntCompareToCmp {
+ absl::weak_ordering operator()(int a, int b) const {
+ if (a < b) return absl::weak_ordering::less;
+ if (a > b) return absl::weak_ordering::greater;
+ return absl::weak_ordering::equivalent;
+ }
+};
+
+TEST(Btree, MergeIntoUniqueContainers) {
+ absl::btree_set<int, IntCompareToCmp> src1 = {1, 2, 3};
+ absl::btree_multiset<int> src2 = {3, 4, 4, 5};
+ absl::btree_set<int> dst;
+
+ dst.merge(src1);
+ EXPECT_TRUE(src1.empty());
+ EXPECT_THAT(dst, ElementsAre(1, 2, 3));
+ dst.merge(src2);
+ EXPECT_THAT(src2, ElementsAre(3, 4));
+ EXPECT_THAT(dst, ElementsAre(1, 2, 3, 4, 5));
+}
+
+TEST(Btree, MergeIntoUniqueContainersWithCompareTo) {
+ absl::btree_set<int, IntCompareToCmp> src1 = {1, 2, 3};
+ absl::btree_multiset<int> src2 = {3, 4, 4, 5};
+ absl::btree_set<int, IntCompareToCmp> dst;
+
+ dst.merge(src1);
+ EXPECT_TRUE(src1.empty());
+ EXPECT_THAT(dst, ElementsAre(1, 2, 3));
+ dst.merge(src2);
+ EXPECT_THAT(src2, ElementsAre(3, 4));
+ EXPECT_THAT(dst, ElementsAre(1, 2, 3, 4, 5));
+}
+
+TEST(Btree, MergeIntoMultiContainers) {
+ absl::btree_set<int, IntCompareToCmp> src1 = {1, 2, 3};
+ absl::btree_multiset<int> src2 = {3, 4, 4, 5};
+ absl::btree_multiset<int> dst;
+
+ dst.merge(src1);
+ EXPECT_TRUE(src1.empty());
+ EXPECT_THAT(dst, ElementsAre(1, 2, 3));
+ dst.merge(src2);
+ EXPECT_TRUE(src2.empty());
+ EXPECT_THAT(dst, ElementsAre(1, 2, 3, 3, 4, 4, 5));
+}
+
+TEST(Btree, MergeIntoMultiContainersWithCompareTo) {
+ absl::btree_set<int, IntCompareToCmp> src1 = {1, 2, 3};
+ absl::btree_multiset<int> src2 = {3, 4, 4, 5};
+ absl::btree_multiset<int, IntCompareToCmp> dst;
+
+ dst.merge(src1);
+ EXPECT_TRUE(src1.empty());
+ EXPECT_THAT(dst, ElementsAre(1, 2, 3));
+ dst.merge(src2);
+ EXPECT_TRUE(src2.empty());
+ EXPECT_THAT(dst, ElementsAre(1, 2, 3, 3, 4, 4, 5));
+}
+
+TEST(Btree, MergeIntoMultiMapsWithDifferentComparators) {
+ absl::btree_map<int, int, IntCompareToCmp> src1 = {{1, 1}, {2, 2}, {3, 3}};
+ absl::btree_multimap<int, int, std::greater<int>> src2 = {
+ {5, 5}, {4, 1}, {4, 4}, {3, 2}};
+ absl::btree_multimap<int, int> dst;
+
+ dst.merge(src1);
+ EXPECT_TRUE(src1.empty());
+ EXPECT_THAT(dst, ElementsAre(Pair(1, 1), Pair(2, 2), Pair(3, 3)));
+ dst.merge(src2);
+ EXPECT_TRUE(src2.empty());
+ EXPECT_THAT(dst, ElementsAre(Pair(1, 1), Pair(2, 2), Pair(3, 3), Pair(3, 2),
+ Pair(4, 1), Pair(4, 4), Pair(5, 5)));
+}
+
+TEST(Btree, MergeIntoSetMovableOnly) {
+ absl::btree_set<MovableOnlyInstance> src;
+ src.insert(MovableOnlyInstance(1));
+ absl::btree_multiset<MovableOnlyInstance> dst1;
+ dst1.insert(MovableOnlyInstance(2));
+ absl::btree_set<MovableOnlyInstance> dst2;
+
+ // Test merge into multiset.
+ dst1.merge(src);
+
+ EXPECT_TRUE(src.empty());
+ // ElementsAre/ElementsAreArray don't work with move-only types.
+ ASSERT_THAT(dst1, SizeIs(2));
+ EXPECT_EQ(*dst1.begin(), MovableOnlyInstance(1));
+ EXPECT_EQ(*std::next(dst1.begin()), MovableOnlyInstance(2));
+
+ // Test merge into set.
+ dst2.merge(dst1);
+
+ EXPECT_TRUE(dst1.empty());
+ ASSERT_THAT(dst2, SizeIs(2));
+ EXPECT_EQ(*dst2.begin(), MovableOnlyInstance(1));
+ EXPECT_EQ(*std::next(dst2.begin()), MovableOnlyInstance(2));
+}
+
+struct KeyCompareToWeakOrdering {
+ template <typename T>
+ absl::weak_ordering operator()(const T &a, const T &b) const {
+ return a < b ? absl::weak_ordering::less
+ : a == b ? absl::weak_ordering::equivalent
+ : absl::weak_ordering::greater;
+ }
+};
+
+struct KeyCompareToStrongOrdering {
+ template <typename T>
+ absl::strong_ordering operator()(const T &a, const T &b) const {
+ return a < b ? absl::strong_ordering::less
+ : a == b ? absl::strong_ordering::equal
+ : absl::strong_ordering::greater;
+ }
+};
+
+TEST(Btree, UserProvidedKeyCompareToComparators) {
+ absl::btree_set<int, KeyCompareToWeakOrdering> weak_set = {1, 2, 3};
+ EXPECT_TRUE(weak_set.contains(2));
+ EXPECT_FALSE(weak_set.contains(4));
+
+ absl::btree_set<int, KeyCompareToStrongOrdering> strong_set = {1, 2, 3};
+ EXPECT_TRUE(strong_set.contains(2));
+ EXPECT_FALSE(strong_set.contains(4));
+}
+
+TEST(Btree, TryEmplaceBasicTest) {
+ absl::btree_map<int, std::string> m;
+
+ // Should construct a string from the literal.
+ m.try_emplace(1, "one");
+ EXPECT_EQ(1, m.size());
+
+ // Try other string constructors and const lvalue key.
+ const int key(42);
+ m.try_emplace(key, 3, 'a');
+ m.try_emplace(2, std::string("two"));
+
+ EXPECT_TRUE(std::is_sorted(m.begin(), m.end()));
+ EXPECT_THAT(m, ElementsAreArray(std::vector<std::pair<int, std::string>>{
+ {1, "one"}, {2, "two"}, {42, "aaa"}}));
+}
+
+TEST(Btree, TryEmplaceWithHintWorks) {
+ // Use a counting comparator here to verify that hint is used.
+ int calls = 0;
+ auto cmp = [&calls](int x, int y) {
+ ++calls;
+ return x < y;
+ };
+ using Cmp = decltype(cmp);
+
+ absl::btree_map<int, int, Cmp> m(cmp);
+ for (int i = 0; i < 128; ++i) {
+ m.emplace(i, i);
+ }
+
+ // Sanity check for the comparator
+ calls = 0;
+ m.emplace(127, 127);
+ EXPECT_GE(calls, 4);
+
+ // Try with begin hint:
+ calls = 0;
+ auto it = m.try_emplace(m.begin(), -1, -1);
+ EXPECT_EQ(129, m.size());
+ EXPECT_EQ(it, m.begin());
+ EXPECT_LE(calls, 2);
+
+ // Try with end hint:
+ calls = 0;
+ std::pair<int, int> pair1024 = {1024, 1024};
+ it = m.try_emplace(m.end(), pair1024.first, pair1024.second);
+ EXPECT_EQ(130, m.size());
+ EXPECT_EQ(it, --m.end());
+ EXPECT_LE(calls, 2);
+
+ // Try value already present, bad hint; ensure no duplicate added:
+ calls = 0;
+ it = m.try_emplace(m.end(), 16, 17);
+ EXPECT_EQ(130, m.size());
+ EXPECT_GE(calls, 4);
+ EXPECT_EQ(it, m.find(16));
+
+ // Try value already present, hint points directly to it:
+ calls = 0;
+ it = m.try_emplace(it, 16, 17);
+ EXPECT_EQ(130, m.size());
+ EXPECT_LE(calls, 2);
+ EXPECT_EQ(it, m.find(16));
+
+ m.erase(2);
+ EXPECT_EQ(129, m.size());
+ auto hint = m.find(3);
+ // Try emplace in the middle of two other elements.
+ calls = 0;
+ m.try_emplace(hint, 2, 2);
+ EXPECT_EQ(130, m.size());
+ EXPECT_LE(calls, 2);
+
+ EXPECT_TRUE(std::is_sorted(m.begin(), m.end()));
+}
+
+TEST(Btree, TryEmplaceWithBadHint) {
+ absl::btree_map<int, int> m = {{1, 1}, {9, 9}};
+
+ // Bad hint (too small), should still emplace:
+ auto it = m.try_emplace(m.begin(), 2, 2);
+ EXPECT_EQ(it, ++m.begin());
+ EXPECT_THAT(m, ElementsAreArray(
+ std::vector<std::pair<int, int>>{{1, 1}, {2, 2}, {9, 9}}));
+
+ // Bad hint, too large this time:
+ it = m.try_emplace(++(++m.begin()), 0, 0);
+ EXPECT_EQ(it, m.begin());
+ EXPECT_THAT(m, ElementsAreArray(std::vector<std::pair<int, int>>{
+ {0, 0}, {1, 1}, {2, 2}, {9, 9}}));
+}
+
+TEST(Btree, TryEmplaceMaintainsSortedOrder) {
+ absl::btree_map<int, std::string> m;
+ std::pair<int, std::string> pair5 = {5, "five"};
+
+ // Test both lvalue & rvalue emplace.
+ m.try_emplace(10, "ten");
+ m.try_emplace(pair5.first, pair5.second);
+ EXPECT_EQ(2, m.size());
+ EXPECT_TRUE(std::is_sorted(m.begin(), m.end()));
+
+ int int100{100};
+ m.try_emplace(int100, "hundred");
+ m.try_emplace(1, "one");
+ EXPECT_EQ(4, m.size());
+ EXPECT_TRUE(std::is_sorted(m.begin(), m.end()));
+}
+
+TEST(Btree, TryEmplaceWithHintAndNoValueArgsWorks) {
+ absl::btree_map<int, int> m;
+ m.try_emplace(m.end(), 1);
+ EXPECT_EQ(0, m[1]);
+}
+
+TEST(Btree, TryEmplaceWithHintAndMultipleValueArgsWorks) {
+ absl::btree_map<int, std::string> m;
+ m.try_emplace(m.end(), 1, 10, 'a');
+ EXPECT_EQ(std::string(10, 'a'), m[1]);
+}
+
+TEST(Btree, MoveAssignmentAllocatorPropagation) {
+ InstanceTracker tracker;
+
+ int64_t bytes1 = 0, bytes2 = 0;
+ PropagatingCountingAlloc<MovableOnlyInstance> allocator1(&bytes1);
+ PropagatingCountingAlloc<MovableOnlyInstance> allocator2(&bytes2);
+ std::less<MovableOnlyInstance> cmp;
+
+ // Test propagating allocator_type.
+ {
+ absl::btree_set<MovableOnlyInstance, std::less<MovableOnlyInstance>,
+ PropagatingCountingAlloc<MovableOnlyInstance>>
+ set1(cmp, allocator1), set2(cmp, allocator2);
+
+ for (int i = 0; i < 100; ++i) set1.insert(MovableOnlyInstance(i));
+
+ tracker.ResetCopiesMovesSwaps();
+ set2 = std::move(set1);
+ EXPECT_EQ(tracker.moves(), 0);
+ }
+ // Test non-propagating allocator_type with equal allocators.
+ {
+ absl::btree_set<MovableOnlyInstance, std::less<MovableOnlyInstance>,
+ CountingAllocator<MovableOnlyInstance>>
+ set1(cmp, allocator1), set2(cmp, allocator1);
+
+ for (int i = 0; i < 100; ++i) set1.insert(MovableOnlyInstance(i));
+
+ tracker.ResetCopiesMovesSwaps();
+ set2 = std::move(set1);
+ EXPECT_EQ(tracker.moves(), 0);
+ }
+ // Test non-propagating allocator_type with different allocators.
+ {
+ absl::btree_set<MovableOnlyInstance, std::less<MovableOnlyInstance>,
+ CountingAllocator<MovableOnlyInstance>>
+ set1(cmp, allocator1), set2(cmp, allocator2);
+
+ for (int i = 0; i < 100; ++i) set1.insert(MovableOnlyInstance(i));
+
+ tracker.ResetCopiesMovesSwaps();
+ set2 = std::move(set1);
+ EXPECT_GE(tracker.moves(), 100);
+ }
+}
+
+TEST(Btree, EmptyTree) {
+ absl::btree_set<int> s;
+ EXPECT_TRUE(s.empty());
+ EXPECT_EQ(s.size(), 0);
+ EXPECT_GT(s.max_size(), 0);
+}
+
+bool IsEven(int k) { return k % 2 == 0; }
+
+TEST(Btree, EraseIf) {
+ // Test that erase_if works with all the container types and supports lambdas.
+ {
+ absl::btree_set<int> s = {1, 3, 5, 6, 100};
+ erase_if(s, [](int k) { return k > 3; });
+ EXPECT_THAT(s, ElementsAre(1, 3));
+ }
+ {
+ absl::btree_multiset<int> s = {1, 3, 3, 5, 6, 6, 100};
+ erase_if(s, [](int k) { return k <= 3; });
+ EXPECT_THAT(s, ElementsAre(5, 6, 6, 100));
+ }
+ {
+ absl::btree_map<int, int> m = {{1, 1}, {3, 3}, {6, 6}, {100, 100}};
+ erase_if(m, [](std::pair<const int, int> kv) { return kv.first > 3; });
+ EXPECT_THAT(m, ElementsAre(Pair(1, 1), Pair(3, 3)));
+ }
+ {
+ absl::btree_multimap<int, int> m = {{1, 1}, {3, 3}, {3, 6},
+ {6, 6}, {6, 7}, {100, 6}};
+ erase_if(m, [](std::pair<const int, int> kv) { return kv.second == 6; });
+ EXPECT_THAT(m, ElementsAre(Pair(1, 1), Pair(3, 3), Pair(6, 7)));
+ }
+ // Test that erasing all elements from a large set works and test support for
+ // function pointers.
+ {
+ absl::btree_set<int> s;
+ for (int i = 0; i < 1000; ++i) s.insert(2 * i);
+ erase_if(s, IsEven);
+ EXPECT_THAT(s, IsEmpty());
+ }
+ // Test that erase_if supports other format of function pointers.
+ {
+ absl::btree_set<int> s = {1, 3, 5, 6, 100};
+ erase_if(s, &IsEven);
+ EXPECT_THAT(s, ElementsAre(1, 3, 5));
+ }
+}
+
+TEST(Btree, InsertOrAssign) {
+ absl::btree_map<int, int> m = {{1, 1}, {3, 3}};
+ using value_type = typename decltype(m)::value_type;
+
+ auto ret = m.insert_or_assign(4, 4);
+ EXPECT_EQ(*ret.first, value_type(4, 4));
+ EXPECT_TRUE(ret.second);
+ ret = m.insert_or_assign(3, 100);
+ EXPECT_EQ(*ret.first, value_type(3, 100));
+ EXPECT_FALSE(ret.second);
+
+ auto hint_ret = m.insert_or_assign(ret.first, 3, 200);
+ EXPECT_EQ(*hint_ret, value_type(3, 200));
+ hint_ret = m.insert_or_assign(m.find(1), 0, 1);
+ EXPECT_EQ(*hint_ret, value_type(0, 1));
+ // Test with bad hint.
+ hint_ret = m.insert_or_assign(m.end(), -1, 1);
+ EXPECT_EQ(*hint_ret, value_type(-1, 1));
+
+ EXPECT_THAT(m, ElementsAre(Pair(-1, 1), Pair(0, 1), Pair(1, 1), Pair(3, 200),
+ Pair(4, 4)));
+}
+
+TEST(Btree, InsertOrAssignMovableOnly) {
+ absl::btree_map<int, MovableOnlyInstance> m;
+ using value_type = typename decltype(m)::value_type;
+
+ auto ret = m.insert_or_assign(4, MovableOnlyInstance(4));
+ EXPECT_EQ(*ret.first, value_type(4, MovableOnlyInstance(4)));
+ EXPECT_TRUE(ret.second);
+ ret = m.insert_or_assign(4, MovableOnlyInstance(100));
+ EXPECT_EQ(*ret.first, value_type(4, MovableOnlyInstance(100)));
+ EXPECT_FALSE(ret.second);
+
+ auto hint_ret = m.insert_or_assign(ret.first, 3, MovableOnlyInstance(200));
+ EXPECT_EQ(*hint_ret, value_type(3, MovableOnlyInstance(200)));
+
+ EXPECT_EQ(m.size(), 2);
+}
+
+TEST(Btree, BitfieldArgument) {
+ union {
+ int n : 1;
+ };
+ n = 0;
+ absl::btree_map<int, int> m;
+ m.erase(n);
+ m.count(n);
+ m.find(n);
+ m.contains(n);
+ m.equal_range(n);
+ m.insert_or_assign(n, n);
+ m.insert_or_assign(m.end(), n, n);
+ m.try_emplace(n);
+ m.try_emplace(m.end(), n);
+ m.at(n);
+ m[n];
+}
+
+TEST(Btree, SetRangeConstructorAndInsertSupportExplicitConversionComparable) {
+ const absl::string_view names[] = {"n1", "n2"};
+
+ absl::btree_set<std::string> name_set1{std::begin(names), std::end(names)};
+ EXPECT_THAT(name_set1, ElementsAreArray(names));
+
+ absl::btree_set<std::string> name_set2;
+ name_set2.insert(std::begin(names), std::end(names));
+ EXPECT_THAT(name_set2, ElementsAreArray(names));
+}
+
+// A type that is explicitly convertible from int and counts constructor calls.
+struct ConstructorCounted {
+ explicit ConstructorCounted(int i) : i(i) { ++constructor_calls; }
+ bool operator==(int other) const { return i == other; }
+
+ int i;
+ static int constructor_calls;
+};
+int ConstructorCounted::constructor_calls = 0;
+
+struct ConstructorCountedCompare {
+ bool operator()(int a, const ConstructorCounted &b) const { return a < b.i; }
+ bool operator()(const ConstructorCounted &a, int b) const { return a.i < b; }
+ bool operator()(const ConstructorCounted &a,
+ const ConstructorCounted &b) const {
+ return a.i < b.i;
+ }
+ using is_transparent = void;
+};
+
+TEST(Btree,
+ SetRangeConstructorAndInsertExplicitConvComparableLimitConstruction) {
+ const int i[] = {0, 1, 1};
+ ConstructorCounted::constructor_calls = 0;
+
+ absl::btree_set<ConstructorCounted, ConstructorCountedCompare> set{
+ std::begin(i), std::end(i)};
+ EXPECT_THAT(set, ElementsAre(0, 1));
+ EXPECT_EQ(ConstructorCounted::constructor_calls, 2);
+
+ set.insert(std::begin(i), std::end(i));
+ EXPECT_THAT(set, ElementsAre(0, 1));
+ EXPECT_EQ(ConstructorCounted::constructor_calls, 2);
+}
+
+TEST(Btree,
+ SetRangeConstructorAndInsertSupportExplicitConversionNonComparable) {
+ const int i[] = {0, 1};
+
+ absl::btree_set<std::vector<void *>> s1{std::begin(i), std::end(i)};
+ EXPECT_THAT(s1, ElementsAre(IsEmpty(), ElementsAre(IsNull())));
+
+ absl::btree_set<std::vector<void *>> s2;
+ s2.insert(std::begin(i), std::end(i));
+ EXPECT_THAT(s2, ElementsAre(IsEmpty(), ElementsAre(IsNull())));
+}
+
+// libstdc++ included with GCC 4.9 has a bug in the std::pair constructors that
+// prevents explicit conversions between pair types.
+// We only run this test for the libstdc++ from GCC 7 or newer because we can't
+// reliably check the libstdc++ version prior to that release.
+#if !defined(__GLIBCXX__) || \
+ (defined(_GLIBCXX_RELEASE) && _GLIBCXX_RELEASE >= 7)
+TEST(Btree, MapRangeConstructorAndInsertSupportExplicitConversionComparable) {
+ const std::pair<absl::string_view, int> names[] = {{"n1", 1}, {"n2", 2}};
+
+ absl::btree_map<std::string, int> name_map1{std::begin(names),
+ std::end(names)};
+ EXPECT_THAT(name_map1, ElementsAre(Pair("n1", 1), Pair("n2", 2)));
+
+ absl::btree_map<std::string, int> name_map2;
+ name_map2.insert(std::begin(names), std::end(names));
+ EXPECT_THAT(name_map2, ElementsAre(Pair("n1", 1), Pair("n2", 2)));
+}
+
+TEST(Btree,
+ MapRangeConstructorAndInsertExplicitConvComparableLimitConstruction) {
+ const std::pair<int, int> i[] = {{0, 1}, {1, 2}, {1, 3}};
+ ConstructorCounted::constructor_calls = 0;
+
+ absl::btree_map<ConstructorCounted, int, ConstructorCountedCompare> map{
+ std::begin(i), std::end(i)};
+ EXPECT_THAT(map, ElementsAre(Pair(0, 1), Pair(1, 2)));
+ EXPECT_EQ(ConstructorCounted::constructor_calls, 2);
+
+ map.insert(std::begin(i), std::end(i));
+ EXPECT_THAT(map, ElementsAre(Pair(0, 1), Pair(1, 2)));
+ EXPECT_EQ(ConstructorCounted::constructor_calls, 2);
+}
+
+TEST(Btree,
+ MapRangeConstructorAndInsertSupportExplicitConversionNonComparable) {
+ const std::pair<int, int> i[] = {{0, 1}, {1, 2}};
+
+ absl::btree_map<std::vector<void *>, int> m1{std::begin(i), std::end(i)};
+ EXPECT_THAT(m1,
+ ElementsAre(Pair(IsEmpty(), 1), Pair(ElementsAre(IsNull()), 2)));
+
+ absl::btree_map<std::vector<void *>, int> m2;
+ m2.insert(std::begin(i), std::end(i));
+ EXPECT_THAT(m2,
+ ElementsAre(Pair(IsEmpty(), 1), Pair(ElementsAre(IsNull()), 2)));
+}
+
+TEST(Btree, HeterogeneousTryEmplace) {
+ absl::btree_map<std::string, int> m;
+ std::string s = "key";
+ absl::string_view sv = s;
+ m.try_emplace(sv, 1);
+ EXPECT_EQ(m[s], 1);
+
+ m.try_emplace(m.end(), sv, 2);
+ EXPECT_EQ(m[s], 1);
+}
+
+TEST(Btree, HeterogeneousOperatorMapped) {
+ absl::btree_map<std::string, int> m;
+ std::string s = "key";
+ absl::string_view sv = s;
+ m[sv] = 1;
+ EXPECT_EQ(m[s], 1);
+
+ m[sv] = 2;
+ EXPECT_EQ(m[s], 2);
+}
+
+TEST(Btree, HeterogeneousInsertOrAssign) {
+ absl::btree_map<std::string, int> m;
+ std::string s = "key";
+ absl::string_view sv = s;
+ m.insert_or_assign(sv, 1);
+ EXPECT_EQ(m[s], 1);
+
+ m.insert_or_assign(m.end(), sv, 2);
+ EXPECT_EQ(m[s], 2);
+}
+#endif
+
+// This test requires std::launder for mutable key access in node handles.
+#if defined(__cpp_lib_launder) && __cpp_lib_launder >= 201606
+TEST(Btree, NodeHandleMutableKeyAccess) {
+ {
+ absl::btree_map<std::string, std::string> map;
+
+ map["key1"] = "mapped";
+
+ auto nh = map.extract(map.begin());
+ nh.key().resize(3);
+ map.insert(std::move(nh));
+
+ EXPECT_THAT(map, ElementsAre(Pair("key", "mapped")));
+ }
+ // Also for multimap.
+ {
+ absl::btree_multimap<std::string, std::string> map;
+
+ map.emplace("key1", "mapped");
+
+ auto nh = map.extract(map.begin());
+ nh.key().resize(3);
+ map.insert(std::move(nh));
+
+ EXPECT_THAT(map, ElementsAre(Pair("key", "mapped")));
+ }
+}
+#endif
+
+struct MultiKey {
+ int i1;
+ int i2;
+};
+
+bool operator==(const MultiKey a, const MultiKey b) {
+ return a.i1 == b.i1 && a.i2 == b.i2;
+}
+
+// A heterogeneous comparator that has different equivalence classes for
+// different lookup types.
+struct MultiKeyComp {
+ using is_transparent = void;
+ bool operator()(const MultiKey a, const MultiKey b) const {
+ if (a.i1 != b.i1) return a.i1 < b.i1;
+ return a.i2 < b.i2;
+ }
+ bool operator()(const int a, const MultiKey b) const { return a < b.i1; }
+ bool operator()(const MultiKey a, const int b) const { return a.i1 < b; }
+};
+
+TEST(Btree, MultiKeyEqualRange) {
+ absl::btree_set<MultiKey, MultiKeyComp> set;
+
+ for (int i = 0; i < 100; ++i) {
+ for (int j = 0; j < 100; ++j) {
+ set.insert({i, j});
+ }
+ }
+
+ for (int i = 0; i < 100; ++i) {
+ auto equal_range = set.equal_range(i);
+ EXPECT_EQ(equal_range.first->i1, i);
+ EXPECT_EQ(equal_range.first->i2, 0);
+ EXPECT_EQ(std::distance(equal_range.first, equal_range.second), 100) << i;
+ }
+}
+
+TEST(Btree, MultiKeyErase) {
+ absl::btree_set<MultiKey, MultiKeyComp> set = {
+ {1, 1}, {2, 1}, {2, 2}, {3, 1}};
+ EXPECT_EQ(set.erase(2), 2);
+ EXPECT_THAT(set, ElementsAre(MultiKey{1, 1}, MultiKey{3, 1}));
+}
+
+TEST(Btree, MultiKeyCount) {
+ const absl::btree_set<MultiKey, MultiKeyComp> set = {
+ {1, 1}, {2, 1}, {2, 2}, {3, 1}};
+ EXPECT_EQ(set.count(2), 2);
+}
+
+TEST(Btree, AllocConstructor) {
+ using Alloc = CountingAllocator<int>;
+ using Set = absl::btree_set<int, std::less<int>, Alloc>;
+ int64_t bytes_used = 0;
+ Alloc alloc(&bytes_used);
+ Set set(alloc);
+
+ set.insert({1, 2, 3});
+
+ EXPECT_THAT(set, ElementsAre(1, 2, 3));
+ EXPECT_GT(bytes_used, set.size() * sizeof(int));
+}
+
+TEST(Btree, AllocInitializerListConstructor) {
+ using Alloc = CountingAllocator<int>;
+ using Set = absl::btree_set<int, std::less<int>, Alloc>;
+ int64_t bytes_used = 0;
+ Alloc alloc(&bytes_used);
+ Set set({1, 2, 3}, alloc);
+
+ EXPECT_THAT(set, ElementsAre(1, 2, 3));
+ EXPECT_GT(bytes_used, set.size() * sizeof(int));
+}
+
+TEST(Btree, AllocRangeConstructor) {
+ using Alloc = CountingAllocator<int>;
+ using Set = absl::btree_set<int, std::less<int>, Alloc>;
+ int64_t bytes_used = 0;
+ Alloc alloc(&bytes_used);
+ std::vector<int> v = {1, 2, 3};
+ Set set(v.begin(), v.end(), alloc);
+
+ EXPECT_THAT(set, ElementsAre(1, 2, 3));
+ EXPECT_GT(bytes_used, set.size() * sizeof(int));
+}
+
+TEST(Btree, AllocCopyConstructor) {
+ using Alloc = CountingAllocator<int>;
+ using Set = absl::btree_set<int, std::less<int>, Alloc>;
+ int64_t bytes_used1 = 0;
+ Alloc alloc1(&bytes_used1);
+ Set set1(alloc1);
+
+ set1.insert({1, 2, 3});
+
+ int64_t bytes_used2 = 0;
+ Alloc alloc2(&bytes_used2);
+ Set set2(set1, alloc2);
+
+ EXPECT_THAT(set1, ElementsAre(1, 2, 3));
+ EXPECT_THAT(set2, ElementsAre(1, 2, 3));
+ EXPECT_GT(bytes_used1, set1.size() * sizeof(int));
+ EXPECT_EQ(bytes_used1, bytes_used2);
+}
+
+TEST(Btree, AllocMoveConstructor_SameAlloc) {
+ using Alloc = CountingAllocator<int>;
+ using Set = absl::btree_set<int, std::less<int>, Alloc>;
+ int64_t bytes_used = 0;
+ Alloc alloc(&bytes_used);
+ Set set1(alloc);
+
+ set1.insert({1, 2, 3});
+
+ const int64_t original_bytes_used = bytes_used;
+ EXPECT_GT(original_bytes_used, set1.size() * sizeof(int));
+
+ Set set2(std::move(set1), alloc);
+
+ EXPECT_THAT(set2, ElementsAre(1, 2, 3));
+ EXPECT_EQ(bytes_used, original_bytes_used);
+}
+
+TEST(Btree, AllocMoveConstructor_DifferentAlloc) {
+ using Alloc = CountingAllocator<int>;
+ using Set = absl::btree_set<int, std::less<int>, Alloc>;
+ int64_t bytes_used1 = 0;
+ Alloc alloc1(&bytes_used1);
+ Set set1(alloc1);
+
+ set1.insert({1, 2, 3});
+
+ const int64_t original_bytes_used = bytes_used1;
+ EXPECT_GT(original_bytes_used, set1.size() * sizeof(int));
+
+ int64_t bytes_used2 = 0;
+ Alloc alloc2(&bytes_used2);
+ Set set2(std::move(set1), alloc2);
+
+ EXPECT_THAT(set2, ElementsAre(1, 2, 3));
+ // We didn't free these bytes allocated by `set1` yet.
+ EXPECT_EQ(bytes_used1, original_bytes_used);
+ EXPECT_EQ(bytes_used2, original_bytes_used);
+}
+
+} // namespace
+} // namespace container_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/container/btree_test.h b/third_party/abseil/src/absl/container/btree_test.h
new file mode 100644
index 0000000..6249080
--- /dev/null
+++ b/third_party/abseil/src/absl/container/btree_test.h
@@ -0,0 +1,166 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_CONTAINER_BTREE_TEST_H_
+#define ABSL_CONTAINER_BTREE_TEST_H_
+
+#include <algorithm>
+#include <cassert>
+#include <random>
+#include <string>
+#include <utility>
+#include <vector>
+
+#include "absl/container/btree_map.h"
+#include "absl/container/btree_set.h"
+#include "absl/container/flat_hash_set.h"
+#include "absl/strings/cord.h"
+#include "absl/time/time.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace container_internal {
+
+// Like remove_const but propagates the removal through std::pair.
+template <typename T>
+struct remove_pair_const {
+ using type = typename std::remove_const<T>::type;
+};
+template <typename T, typename U>
+struct remove_pair_const<std::pair<T, U> > {
+ using type = std::pair<typename remove_pair_const<T>::type,
+ typename remove_pair_const<U>::type>;
+};
+
+// Utility class to provide an accessor for a key given a value. The default
+// behavior is to treat the value as a pair and return the first element.
+template <typename K, typename V>
+struct KeyOfValue {
+ struct type {
+ const K& operator()(const V& p) const { return p.first; }
+ };
+};
+
+// Partial specialization of KeyOfValue class for when the key and value are
+// the same type such as in set<> and btree_set<>.
+template <typename K>
+struct KeyOfValue<K, K> {
+ struct type {
+ const K& operator()(const K& k) const { return k; }
+ };
+};
+
+inline char* GenerateDigits(char buf[16], unsigned val, unsigned maxval) {
+ assert(val <= maxval);
+ constexpr unsigned kBase = 64; // avoid integer division.
+ unsigned p = 15;
+ buf[p--] = 0;
+ while (maxval > 0) {
+ buf[p--] = ' ' + (val % kBase);
+ val /= kBase;
+ maxval /= kBase;
+ }
+ return buf + p + 1;
+}
+
+template <typename K>
+struct Generator {
+ int maxval;
+ explicit Generator(int m) : maxval(m) {}
+ K operator()(int i) const {
+ assert(i <= maxval);
+ return K(i);
+ }
+};
+
+template <>
+struct Generator<absl::Time> {
+ int maxval;
+ explicit Generator(int m) : maxval(m) {}
+ absl::Time operator()(int i) const { return absl::FromUnixMillis(i); }
+};
+
+template <>
+struct Generator<std::string> {
+ int maxval;
+ explicit Generator(int m) : maxval(m) {}
+ std::string operator()(int i) const {
+ char buf[16];
+ return GenerateDigits(buf, i, maxval);
+ }
+};
+
+template <>
+struct Generator<Cord> {
+ int maxval;
+ explicit Generator(int m) : maxval(m) {}
+ Cord operator()(int i) const {
+ char buf[16];
+ return Cord(GenerateDigits(buf, i, maxval));
+ }
+};
+
+template <typename T, typename U>
+struct Generator<std::pair<T, U> > {
+ Generator<typename remove_pair_const<T>::type> tgen;
+ Generator<typename remove_pair_const<U>::type> ugen;
+
+ explicit Generator(int m) : tgen(m), ugen(m) {}
+ std::pair<T, U> operator()(int i) const {
+ return std::make_pair(tgen(i), ugen(i));
+ }
+};
+
+// Generate n values for our tests and benchmarks. Value range is [0, maxval].
+inline std::vector<int> GenerateNumbersWithSeed(int n, int maxval, int seed) {
+ // NOTE: Some tests rely on generated numbers not changing between test runs.
+ // We use std::minstd_rand0 because it is well-defined, but don't use
+ // std::uniform_int_distribution because platforms use different algorithms.
+ std::minstd_rand0 rng(seed);
+
+ std::vector<int> values;
+ absl::flat_hash_set<int> unique_values;
+ if (values.size() < n) {
+ for (int i = values.size(); i < n; i++) {
+ int value;
+ do {
+ value = static_cast<int>(rng()) % (maxval + 1);
+ } while (!unique_values.insert(value).second);
+
+ values.push_back(value);
+ }
+ }
+ return values;
+}
+
+// Generates n values in the range [0, maxval].
+template <typename V>
+std::vector<V> GenerateValuesWithSeed(int n, int maxval, int seed) {
+ const std::vector<int> nums = GenerateNumbersWithSeed(n, maxval, seed);
+ Generator<V> gen(maxval);
+ std::vector<V> vec;
+
+ vec.reserve(n);
+ for (int i = 0; i < n; i++) {
+ vec.push_back(gen(nums[i]));
+ }
+
+ return vec;
+}
+
+} // namespace container_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_CONTAINER_BTREE_TEST_H_
diff --git a/third_party/abseil/src/absl/container/fixed_array.h b/third_party/abseil/src/absl/container/fixed_array.h
new file mode 100644
index 0000000..fcb3e54
--- /dev/null
+++ b/third_party/abseil/src/absl/container/fixed_array.h
@@ -0,0 +1,532 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: fixed_array.h
+// -----------------------------------------------------------------------------
+//
+// A `FixedArray<T>` represents a non-resizable array of `T` where the length of
+// the array can be determined at run-time. It is a good replacement for
+// non-standard and deprecated uses of `alloca()` and variable length arrays
+// within the GCC extension. (See
+// https://gcc.gnu.org/onlinedocs/gcc/Variable-Length.html).
+//
+// `FixedArray` allocates small arrays inline, keeping performance fast by
+// avoiding heap operations. It also helps reduce the chances of
+// accidentally overflowing your stack if large input is passed to
+// your function.
+
+#ifndef ABSL_CONTAINER_FIXED_ARRAY_H_
+#define ABSL_CONTAINER_FIXED_ARRAY_H_
+
+#include <algorithm>
+#include <cassert>
+#include <cstddef>
+#include <initializer_list>
+#include <iterator>
+#include <limits>
+#include <memory>
+#include <new>
+#include <type_traits>
+
+#include "absl/algorithm/algorithm.h"
+#include "absl/base/config.h"
+#include "absl/base/dynamic_annotations.h"
+#include "absl/base/internal/throw_delegate.h"
+#include "absl/base/macros.h"
+#include "absl/base/optimization.h"
+#include "absl/base/port.h"
+#include "absl/container/internal/compressed_tuple.h"
+#include "absl/memory/memory.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+constexpr static auto kFixedArrayUseDefault = static_cast<size_t>(-1);
+
+// -----------------------------------------------------------------------------
+// FixedArray
+// -----------------------------------------------------------------------------
+//
+// A `FixedArray` provides a run-time fixed-size array, allocating a small array
+// inline for efficiency.
+//
+// Most users should not specify an `inline_elements` argument and let
+// `FixedArray` automatically determine the number of elements
+// to store inline based on `sizeof(T)`. If `inline_elements` is specified, the
+// `FixedArray` implementation will use inline storage for arrays with a
+// length <= `inline_elements`.
+//
+// Note that a `FixedArray` constructed with a `size_type` argument will
+// default-initialize its values by leaving trivially constructible types
+// uninitialized (e.g. int, int[4], double), and others default-constructed.
+// This matches the behavior of c-style arrays and `std::array`, but not
+// `std::vector`.
+//
+// Note that `FixedArray` does not provide a public allocator; if it requires a
+// heap allocation, it will do so with global `::operator new[]()` and
+// `::operator delete[]()`, even if T provides class-scope overrides for these
+// operators.
+template <typename T, size_t N = kFixedArrayUseDefault,
+ typename A = std::allocator<T>>
+class FixedArray {
+ static_assert(!std::is_array<T>::value || std::extent<T>::value > 0,
+ "Arrays with unknown bounds cannot be used with FixedArray.");
+
+ static constexpr size_t kInlineBytesDefault = 256;
+
+ using AllocatorTraits = std::allocator_traits<A>;
+ // std::iterator_traits isn't guaranteed to be SFINAE-friendly until C++17,
+ // but this seems to be mostly pedantic.
+ template <typename Iterator>
+ using EnableIfForwardIterator = absl::enable_if_t<std::is_convertible<
+ typename std::iterator_traits<Iterator>::iterator_category,
+ std::forward_iterator_tag>::value>;
+ static constexpr bool NoexceptCopyable() {
+ return std::is_nothrow_copy_constructible<StorageElement>::value &&
+ absl::allocator_is_nothrow<allocator_type>::value;
+ }
+ static constexpr bool NoexceptMovable() {
+ return std::is_nothrow_move_constructible<StorageElement>::value &&
+ absl::allocator_is_nothrow<allocator_type>::value;
+ }
+ static constexpr bool DefaultConstructorIsNonTrivial() {
+ return !absl::is_trivially_default_constructible<StorageElement>::value;
+ }
+
+ public:
+ using allocator_type = typename AllocatorTraits::allocator_type;
+ using value_type = typename AllocatorTraits::value_type;
+ using pointer = typename AllocatorTraits::pointer;
+ using const_pointer = typename AllocatorTraits::const_pointer;
+ using reference = value_type&;
+ using const_reference = const value_type&;
+ using size_type = typename AllocatorTraits::size_type;
+ using difference_type = typename AllocatorTraits::difference_type;
+ using iterator = pointer;
+ using const_iterator = const_pointer;
+ using reverse_iterator = std::reverse_iterator<iterator>;
+ using const_reverse_iterator = std::reverse_iterator<const_iterator>;
+
+ static constexpr size_type inline_elements =
+ (N == kFixedArrayUseDefault ? kInlineBytesDefault / sizeof(value_type)
+ : static_cast<size_type>(N));
+
+ FixedArray(
+ const FixedArray& other,
+ const allocator_type& a = allocator_type()) noexcept(NoexceptCopyable())
+ : FixedArray(other.begin(), other.end(), a) {}
+
+ FixedArray(
+ FixedArray&& other,
+ const allocator_type& a = allocator_type()) noexcept(NoexceptMovable())
+ : FixedArray(std::make_move_iterator(other.begin()),
+ std::make_move_iterator(other.end()), a) {}
+
+ // Creates an array object that can store `n` elements.
+ // Note that trivially constructible elements will be uninitialized.
+ explicit FixedArray(size_type n, const allocator_type& a = allocator_type())
+ : storage_(n, a) {
+ if (DefaultConstructorIsNonTrivial()) {
+ memory_internal::ConstructRange(storage_.alloc(), storage_.begin(),
+ storage_.end());
+ }
+ }
+
+ // Creates an array initialized with `n` copies of `val`.
+ FixedArray(size_type n, const value_type& val,
+ const allocator_type& a = allocator_type())
+ : storage_(n, a) {
+ memory_internal::ConstructRange(storage_.alloc(), storage_.begin(),
+ storage_.end(), val);
+ }
+
+ // Creates an array initialized with the size and contents of `init_list`.
+ FixedArray(std::initializer_list<value_type> init_list,
+ const allocator_type& a = allocator_type())
+ : FixedArray(init_list.begin(), init_list.end(), a) {}
+
+ // Creates an array initialized with the elements from the input
+ // range. The array's size will always be `std::distance(first, last)`.
+ // REQUIRES: Iterator must be a forward_iterator or better.
+ template <typename Iterator, EnableIfForwardIterator<Iterator>* = nullptr>
+ FixedArray(Iterator first, Iterator last,
+ const allocator_type& a = allocator_type())
+ : storage_(std::distance(first, last), a) {
+ memory_internal::CopyRange(storage_.alloc(), storage_.begin(), first, last);
+ }
+
+ ~FixedArray() noexcept {
+ for (auto* cur = storage_.begin(); cur != storage_.end(); ++cur) {
+ AllocatorTraits::destroy(storage_.alloc(), cur);
+ }
+ }
+
+ // Assignments are deleted because they break the invariant that the size of a
+ // `FixedArray` never changes.
+ void operator=(FixedArray&&) = delete;
+ void operator=(const FixedArray&) = delete;
+
+ // FixedArray::size()
+ //
+ // Returns the length of the fixed array.
+ size_type size() const { return storage_.size(); }
+
+ // FixedArray::max_size()
+ //
+ // Returns the largest possible value of `std::distance(begin(), end())` for a
+ // `FixedArray<T>`. This is equivalent to the most possible addressable bytes
+ // over the number of bytes taken by T.
+ constexpr size_type max_size() const {
+ return (std::numeric_limits<difference_type>::max)() / sizeof(value_type);
+ }
+
+ // FixedArray::empty()
+ //
+ // Returns whether or not the fixed array is empty.
+ bool empty() const { return size() == 0; }
+
+ // FixedArray::memsize()
+ //
+ // Returns the memory size of the fixed array in bytes.
+ size_t memsize() const { return size() * sizeof(value_type); }
+
+ // FixedArray::data()
+ //
+ // Returns a const T* pointer to elements of the `FixedArray`. This pointer
+ // can be used to access (but not modify) the contained elements.
+ const_pointer data() const { return AsValueType(storage_.begin()); }
+
+ // Overload of FixedArray::data() to return a T* pointer to elements of the
+ // fixed array. This pointer can be used to access and modify the contained
+ // elements.
+ pointer data() { return AsValueType(storage_.begin()); }
+
+ // FixedArray::operator[]
+ //
+ // Returns a reference the ith element of the fixed array.
+ // REQUIRES: 0 <= i < size()
+ reference operator[](size_type i) {
+ ABSL_HARDENING_ASSERT(i < size());
+ return data()[i];
+ }
+
+ // Overload of FixedArray::operator()[] to return a const reference to the
+ // ith element of the fixed array.
+ // REQUIRES: 0 <= i < size()
+ const_reference operator[](size_type i) const {
+ ABSL_HARDENING_ASSERT(i < size());
+ return data()[i];
+ }
+
+ // FixedArray::at
+ //
+ // Bounds-checked access. Returns a reference to the ith element of the fixed
+ // array, or throws std::out_of_range
+ reference at(size_type i) {
+ if (ABSL_PREDICT_FALSE(i >= size())) {
+ base_internal::ThrowStdOutOfRange("FixedArray::at failed bounds check");
+ }
+ return data()[i];
+ }
+
+ // Overload of FixedArray::at() to return a const reference to the ith element
+ // of the fixed array.
+ const_reference at(size_type i) const {
+ if (ABSL_PREDICT_FALSE(i >= size())) {
+ base_internal::ThrowStdOutOfRange("FixedArray::at failed bounds check");
+ }
+ return data()[i];
+ }
+
+ // FixedArray::front()
+ //
+ // Returns a reference to the first element of the fixed array.
+ reference front() {
+ ABSL_HARDENING_ASSERT(!empty());
+ return data()[0];
+ }
+
+ // Overload of FixedArray::front() to return a reference to the first element
+ // of a fixed array of const values.
+ const_reference front() const {
+ ABSL_HARDENING_ASSERT(!empty());
+ return data()[0];
+ }
+
+ // FixedArray::back()
+ //
+ // Returns a reference to the last element of the fixed array.
+ reference back() {
+ ABSL_HARDENING_ASSERT(!empty());
+ return data()[size() - 1];
+ }
+
+ // Overload of FixedArray::back() to return a reference to the last element
+ // of a fixed array of const values.
+ const_reference back() const {
+ ABSL_HARDENING_ASSERT(!empty());
+ return data()[size() - 1];
+ }
+
+ // FixedArray::begin()
+ //
+ // Returns an iterator to the beginning of the fixed array.
+ iterator begin() { return data(); }
+
+ // Overload of FixedArray::begin() to return a const iterator to the
+ // beginning of the fixed array.
+ const_iterator begin() const { return data(); }
+
+ // FixedArray::cbegin()
+ //
+ // Returns a const iterator to the beginning of the fixed array.
+ const_iterator cbegin() const { return begin(); }
+
+ // FixedArray::end()
+ //
+ // Returns an iterator to the end of the fixed array.
+ iterator end() { return data() + size(); }
+
+ // Overload of FixedArray::end() to return a const iterator to the end of the
+ // fixed array.
+ const_iterator end() const { return data() + size(); }
+
+ // FixedArray::cend()
+ //
+ // Returns a const iterator to the end of the fixed array.
+ const_iterator cend() const { return end(); }
+
+ // FixedArray::rbegin()
+ //
+ // Returns a reverse iterator from the end of the fixed array.
+ reverse_iterator rbegin() { return reverse_iterator(end()); }
+
+ // Overload of FixedArray::rbegin() to return a const reverse iterator from
+ // the end of the fixed array.
+ const_reverse_iterator rbegin() const {
+ return const_reverse_iterator(end());
+ }
+
+ // FixedArray::crbegin()
+ //
+ // Returns a const reverse iterator from the end of the fixed array.
+ const_reverse_iterator crbegin() const { return rbegin(); }
+
+ // FixedArray::rend()
+ //
+ // Returns a reverse iterator from the beginning of the fixed array.
+ reverse_iterator rend() { return reverse_iterator(begin()); }
+
+ // Overload of FixedArray::rend() for returning a const reverse iterator
+ // from the beginning of the fixed array.
+ const_reverse_iterator rend() const {
+ return const_reverse_iterator(begin());
+ }
+
+ // FixedArray::crend()
+ //
+ // Returns a reverse iterator from the beginning of the fixed array.
+ const_reverse_iterator crend() const { return rend(); }
+
+ // FixedArray::fill()
+ //
+ // Assigns the given `value` to all elements in the fixed array.
+ void fill(const value_type& val) { std::fill(begin(), end(), val); }
+
+ // Relational operators. Equality operators are elementwise using
+ // `operator==`, while order operators order FixedArrays lexicographically.
+ friend bool operator==(const FixedArray& lhs, const FixedArray& rhs) {
+ return absl::equal(lhs.begin(), lhs.end(), rhs.begin(), rhs.end());
+ }
+
+ friend bool operator!=(const FixedArray& lhs, const FixedArray& rhs) {
+ return !(lhs == rhs);
+ }
+
+ friend bool operator<(const FixedArray& lhs, const FixedArray& rhs) {
+ return std::lexicographical_compare(lhs.begin(), lhs.end(), rhs.begin(),
+ rhs.end());
+ }
+
+ friend bool operator>(const FixedArray& lhs, const FixedArray& rhs) {
+ return rhs < lhs;
+ }
+
+ friend bool operator<=(const FixedArray& lhs, const FixedArray& rhs) {
+ return !(rhs < lhs);
+ }
+
+ friend bool operator>=(const FixedArray& lhs, const FixedArray& rhs) {
+ return !(lhs < rhs);
+ }
+
+ template <typename H>
+ friend H AbslHashValue(H h, const FixedArray& v) {
+ return H::combine(H::combine_contiguous(std::move(h), v.data(), v.size()),
+ v.size());
+ }
+
+ private:
+ // StorageElement
+ //
+ // For FixedArrays with a C-style-array value_type, StorageElement is a POD
+ // wrapper struct called StorageElementWrapper that holds the value_type
+ // instance inside. This is needed for construction and destruction of the
+ // entire array regardless of how many dimensions it has. For all other cases,
+ // StorageElement is just an alias of value_type.
+ //
+ // Maintainer's Note: The simpler solution would be to simply wrap value_type
+ // in a struct whether it's an array or not. That causes some paranoid
+ // diagnostics to misfire, believing that 'data()' returns a pointer to a
+ // single element, rather than the packed array that it really is.
+ // e.g.:
+ //
+ // FixedArray<char> buf(1);
+ // sprintf(buf.data(), "foo");
+ //
+ // error: call to int __builtin___sprintf_chk(etc...)
+ // will always overflow destination buffer [-Werror]
+ //
+ template <typename OuterT, typename InnerT = absl::remove_extent_t<OuterT>,
+ size_t InnerN = std::extent<OuterT>::value>
+ struct StorageElementWrapper {
+ InnerT array[InnerN];
+ };
+
+ using StorageElement =
+ absl::conditional_t<std::is_array<value_type>::value,
+ StorageElementWrapper<value_type>, value_type>;
+
+ static pointer AsValueType(pointer ptr) { return ptr; }
+ static pointer AsValueType(StorageElementWrapper<value_type>* ptr) {
+ return std::addressof(ptr->array);
+ }
+
+ static_assert(sizeof(StorageElement) == sizeof(value_type), "");
+ static_assert(alignof(StorageElement) == alignof(value_type), "");
+
+ class NonEmptyInlinedStorage {
+ public:
+ StorageElement* data() { return reinterpret_cast<StorageElement*>(buff_); }
+ void AnnotateConstruct(size_type n);
+ void AnnotateDestruct(size_type n);
+
+#ifdef ABSL_HAVE_ADDRESS_SANITIZER
+ void* RedzoneBegin() { return &redzone_begin_; }
+ void* RedzoneEnd() { return &redzone_end_ + 1; }
+#endif // ABSL_HAVE_ADDRESS_SANITIZER
+
+ private:
+ ABSL_ADDRESS_SANITIZER_REDZONE(redzone_begin_);
+ alignas(StorageElement) char buff_[sizeof(StorageElement[inline_elements])];
+ ABSL_ADDRESS_SANITIZER_REDZONE(redzone_end_);
+ };
+
+ class EmptyInlinedStorage {
+ public:
+ StorageElement* data() { return nullptr; }
+ void AnnotateConstruct(size_type) {}
+ void AnnotateDestruct(size_type) {}
+ };
+
+ using InlinedStorage =
+ absl::conditional_t<inline_elements == 0, EmptyInlinedStorage,
+ NonEmptyInlinedStorage>;
+
+ // Storage
+ //
+ // An instance of Storage manages the inline and out-of-line memory for
+ // instances of FixedArray. This guarantees that even when construction of
+ // individual elements fails in the FixedArray constructor body, the
+ // destructor for Storage will still be called and out-of-line memory will be
+ // properly deallocated.
+ //
+ class Storage : public InlinedStorage {
+ public:
+ Storage(size_type n, const allocator_type& a)
+ : size_alloc_(n, a), data_(InitializeData()) {}
+
+ ~Storage() noexcept {
+ if (UsingInlinedStorage(size())) {
+ InlinedStorage::AnnotateDestruct(size());
+ } else {
+ AllocatorTraits::deallocate(alloc(), AsValueType(begin()), size());
+ }
+ }
+
+ size_type size() const { return size_alloc_.template get<0>(); }
+ StorageElement* begin() const { return data_; }
+ StorageElement* end() const { return begin() + size(); }
+ allocator_type& alloc() { return size_alloc_.template get<1>(); }
+
+ private:
+ static bool UsingInlinedStorage(size_type n) {
+ return n <= inline_elements;
+ }
+
+ StorageElement* InitializeData() {
+ if (UsingInlinedStorage(size())) {
+ InlinedStorage::AnnotateConstruct(size());
+ return InlinedStorage::data();
+ } else {
+ return reinterpret_cast<StorageElement*>(
+ AllocatorTraits::allocate(alloc(), size()));
+ }
+ }
+
+ // `CompressedTuple` takes advantage of EBCO for stateless `allocator_type`s
+ container_internal::CompressedTuple<size_type, allocator_type> size_alloc_;
+ StorageElement* data_;
+ };
+
+ Storage storage_;
+};
+
+template <typename T, size_t N, typename A>
+constexpr size_t FixedArray<T, N, A>::kInlineBytesDefault;
+
+template <typename T, size_t N, typename A>
+constexpr typename FixedArray<T, N, A>::size_type
+ FixedArray<T, N, A>::inline_elements;
+
+template <typename T, size_t N, typename A>
+void FixedArray<T, N, A>::NonEmptyInlinedStorage::AnnotateConstruct(
+ typename FixedArray<T, N, A>::size_type n) {
+#ifdef ABSL_HAVE_ADDRESS_SANITIZER
+ if (!n) return;
+ ABSL_ANNOTATE_CONTIGUOUS_CONTAINER(data(), RedzoneEnd(), RedzoneEnd(),
+ data() + n);
+ ABSL_ANNOTATE_CONTIGUOUS_CONTAINER(RedzoneBegin(), data(), data(),
+ RedzoneBegin());
+#endif // ABSL_HAVE_ADDRESS_SANITIZER
+ static_cast<void>(n); // Mark used when not in asan mode
+}
+
+template <typename T, size_t N, typename A>
+void FixedArray<T, N, A>::NonEmptyInlinedStorage::AnnotateDestruct(
+ typename FixedArray<T, N, A>::size_type n) {
+#ifdef ABSL_HAVE_ADDRESS_SANITIZER
+ if (!n) return;
+ ABSL_ANNOTATE_CONTIGUOUS_CONTAINER(data(), RedzoneEnd(), data() + n,
+ RedzoneEnd());
+ ABSL_ANNOTATE_CONTIGUOUS_CONTAINER(RedzoneBegin(), data(), RedzoneBegin(),
+ data());
+#endif // ABSL_HAVE_ADDRESS_SANITIZER
+ static_cast<void>(n); // Mark used when not in asan mode
+}
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_CONTAINER_FIXED_ARRAY_H_
diff --git a/third_party/abseil/src/absl/container/fixed_array_benchmark.cc b/third_party/abseil/src/absl/container/fixed_array_benchmark.cc
new file mode 100644
index 0000000..3c7a5a7
--- /dev/null
+++ b/third_party/abseil/src/absl/container/fixed_array_benchmark.cc
@@ -0,0 +1,67 @@
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <stddef.h>
+
+#include <string>
+
+#include "benchmark/benchmark.h"
+#include "absl/container/fixed_array.h"
+
+namespace {
+
+// For benchmarking -- simple class with constructor and destructor that
+// set an int to a constant..
+class SimpleClass {
+ public:
+ SimpleClass() : i(3) {}
+ ~SimpleClass() { i = 0; }
+
+ private:
+ int i;
+};
+
+template <typename C, size_t stack_size>
+void BM_FixedArray(benchmark::State& state) {
+ const int size = state.range(0);
+ for (auto _ : state) {
+ absl::FixedArray<C, stack_size> fa(size);
+ benchmark::DoNotOptimize(fa.data());
+ }
+}
+BENCHMARK_TEMPLATE(BM_FixedArray, char, absl::kFixedArrayUseDefault)
+ ->Range(0, 1 << 16);
+BENCHMARK_TEMPLATE(BM_FixedArray, char, 0)->Range(0, 1 << 16);
+BENCHMARK_TEMPLATE(BM_FixedArray, char, 1)->Range(0, 1 << 16);
+BENCHMARK_TEMPLATE(BM_FixedArray, char, 16)->Range(0, 1 << 16);
+BENCHMARK_TEMPLATE(BM_FixedArray, char, 256)->Range(0, 1 << 16);
+BENCHMARK_TEMPLATE(BM_FixedArray, char, 65536)->Range(0, 1 << 16);
+
+BENCHMARK_TEMPLATE(BM_FixedArray, SimpleClass, absl::kFixedArrayUseDefault)
+ ->Range(0, 1 << 16);
+BENCHMARK_TEMPLATE(BM_FixedArray, SimpleClass, 0)->Range(0, 1 << 16);
+BENCHMARK_TEMPLATE(BM_FixedArray, SimpleClass, 1)->Range(0, 1 << 16);
+BENCHMARK_TEMPLATE(BM_FixedArray, SimpleClass, 16)->Range(0, 1 << 16);
+BENCHMARK_TEMPLATE(BM_FixedArray, SimpleClass, 256)->Range(0, 1 << 16);
+BENCHMARK_TEMPLATE(BM_FixedArray, SimpleClass, 65536)->Range(0, 1 << 16);
+
+BENCHMARK_TEMPLATE(BM_FixedArray, std::string, absl::kFixedArrayUseDefault)
+ ->Range(0, 1 << 16);
+BENCHMARK_TEMPLATE(BM_FixedArray, std::string, 0)->Range(0, 1 << 16);
+BENCHMARK_TEMPLATE(BM_FixedArray, std::string, 1)->Range(0, 1 << 16);
+BENCHMARK_TEMPLATE(BM_FixedArray, std::string, 16)->Range(0, 1 << 16);
+BENCHMARK_TEMPLATE(BM_FixedArray, std::string, 256)->Range(0, 1 << 16);
+BENCHMARK_TEMPLATE(BM_FixedArray, std::string, 65536)->Range(0, 1 << 16);
+
+} // namespace
diff --git a/third_party/abseil/src/absl/container/fixed_array_exception_safety_test.cc b/third_party/abseil/src/absl/container/fixed_array_exception_safety_test.cc
new file mode 100644
index 0000000..e5f5929
--- /dev/null
+++ b/third_party/abseil/src/absl/container/fixed_array_exception_safety_test.cc
@@ -0,0 +1,201 @@
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/base/config.h"
+#include "absl/container/fixed_array.h"
+
+#ifdef ABSL_HAVE_EXCEPTIONS
+
+#include <initializer_list>
+
+#include "gtest/gtest.h"
+#include "absl/base/internal/exception_safety_testing.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+namespace {
+
+constexpr size_t kInlined = 25;
+constexpr size_t kSmallSize = kInlined / 2;
+constexpr size_t kLargeSize = kInlined * 2;
+
+constexpr int kInitialValue = 5;
+constexpr int kUpdatedValue = 10;
+
+using ::testing::TestThrowingCtor;
+
+using Thrower = testing::ThrowingValue<testing::TypeSpec::kEverythingThrows>;
+using ThrowAlloc =
+ testing::ThrowingAllocator<Thrower, testing::AllocSpec::kEverythingThrows>;
+using MoveThrower = testing::ThrowingValue<testing::TypeSpec::kNoThrowMove>;
+using MoveThrowAlloc =
+ testing::ThrowingAllocator<MoveThrower,
+ testing::AllocSpec::kEverythingThrows>;
+
+using FixedArr = absl::FixedArray<Thrower, kInlined>;
+using FixedArrWithAlloc = absl::FixedArray<Thrower, kInlined, ThrowAlloc>;
+
+using MoveFixedArr = absl::FixedArray<MoveThrower, kInlined>;
+using MoveFixedArrWithAlloc =
+ absl::FixedArray<MoveThrower, kInlined, MoveThrowAlloc>;
+
+TEST(FixedArrayExceptionSafety, CopyConstructor) {
+ auto small = FixedArr(kSmallSize);
+ TestThrowingCtor<FixedArr>(small);
+
+ auto large = FixedArr(kLargeSize);
+ TestThrowingCtor<FixedArr>(large);
+}
+
+TEST(FixedArrayExceptionSafety, CopyConstructorWithAlloc) {
+ auto small = FixedArrWithAlloc(kSmallSize);
+ TestThrowingCtor<FixedArrWithAlloc>(small);
+
+ auto large = FixedArrWithAlloc(kLargeSize);
+ TestThrowingCtor<FixedArrWithAlloc>(large);
+}
+
+TEST(FixedArrayExceptionSafety, MoveConstructor) {
+ TestThrowingCtor<FixedArr>(FixedArr(kSmallSize));
+ TestThrowingCtor<FixedArr>(FixedArr(kLargeSize));
+
+ // TypeSpec::kNoThrowMove
+ TestThrowingCtor<MoveFixedArr>(MoveFixedArr(kSmallSize));
+ TestThrowingCtor<MoveFixedArr>(MoveFixedArr(kLargeSize));
+}
+
+TEST(FixedArrayExceptionSafety, MoveConstructorWithAlloc) {
+ TestThrowingCtor<FixedArrWithAlloc>(FixedArrWithAlloc(kSmallSize));
+ TestThrowingCtor<FixedArrWithAlloc>(FixedArrWithAlloc(kLargeSize));
+
+ // TypeSpec::kNoThrowMove
+ TestThrowingCtor<MoveFixedArrWithAlloc>(MoveFixedArrWithAlloc(kSmallSize));
+ TestThrowingCtor<MoveFixedArrWithAlloc>(MoveFixedArrWithAlloc(kLargeSize));
+}
+
+TEST(FixedArrayExceptionSafety, SizeConstructor) {
+ TestThrowingCtor<FixedArr>(kSmallSize);
+ TestThrowingCtor<FixedArr>(kLargeSize);
+}
+
+TEST(FixedArrayExceptionSafety, SizeConstructorWithAlloc) {
+ TestThrowingCtor<FixedArrWithAlloc>(kSmallSize);
+ TestThrowingCtor<FixedArrWithAlloc>(kLargeSize);
+}
+
+TEST(FixedArrayExceptionSafety, SizeValueConstructor) {
+ TestThrowingCtor<FixedArr>(kSmallSize, Thrower());
+ TestThrowingCtor<FixedArr>(kLargeSize, Thrower());
+}
+
+TEST(FixedArrayExceptionSafety, SizeValueConstructorWithAlloc) {
+ TestThrowingCtor<FixedArrWithAlloc>(kSmallSize, Thrower());
+ TestThrowingCtor<FixedArrWithAlloc>(kLargeSize, Thrower());
+}
+
+TEST(FixedArrayExceptionSafety, IteratorConstructor) {
+ auto small = FixedArr(kSmallSize);
+ TestThrowingCtor<FixedArr>(small.begin(), small.end());
+
+ auto large = FixedArr(kLargeSize);
+ TestThrowingCtor<FixedArr>(large.begin(), large.end());
+}
+
+TEST(FixedArrayExceptionSafety, IteratorConstructorWithAlloc) {
+ auto small = FixedArrWithAlloc(kSmallSize);
+ TestThrowingCtor<FixedArrWithAlloc>(small.begin(), small.end());
+
+ auto large = FixedArrWithAlloc(kLargeSize);
+ TestThrowingCtor<FixedArrWithAlloc>(large.begin(), large.end());
+}
+
+TEST(FixedArrayExceptionSafety, InitListConstructor) {
+ constexpr int small_inlined = 3;
+ using SmallFixedArr = absl::FixedArray<Thrower, small_inlined>;
+
+ TestThrowingCtor<SmallFixedArr>(std::initializer_list<Thrower>{});
+ // Test inlined allocation
+ TestThrowingCtor<SmallFixedArr>(
+ std::initializer_list<Thrower>{Thrower{}, Thrower{}});
+ // Test out of line allocation
+ TestThrowingCtor<SmallFixedArr>(std::initializer_list<Thrower>{
+ Thrower{}, Thrower{}, Thrower{}, Thrower{}, Thrower{}});
+}
+
+TEST(FixedArrayExceptionSafety, InitListConstructorWithAlloc) {
+ constexpr int small_inlined = 3;
+ using SmallFixedArrWithAlloc =
+ absl::FixedArray<Thrower, small_inlined, ThrowAlloc>;
+
+ TestThrowingCtor<SmallFixedArrWithAlloc>(std::initializer_list<Thrower>{});
+ // Test inlined allocation
+ TestThrowingCtor<SmallFixedArrWithAlloc>(
+ std::initializer_list<Thrower>{Thrower{}, Thrower{}});
+ // Test out of line allocation
+ TestThrowingCtor<SmallFixedArrWithAlloc>(std::initializer_list<Thrower>{
+ Thrower{}, Thrower{}, Thrower{}, Thrower{}, Thrower{}});
+}
+
+template <typename FixedArrT>
+testing::AssertionResult ReadMemory(FixedArrT* fixed_arr) {
+ int sum = 0;
+ for (const auto& thrower : *fixed_arr) {
+ sum += thrower.Get();
+ }
+ return testing::AssertionSuccess() << "Values sum to [" << sum << "]";
+}
+
+TEST(FixedArrayExceptionSafety, Fill) {
+ auto test_fill = testing::MakeExceptionSafetyTester()
+ .WithContracts(ReadMemory<FixedArr>)
+ .WithOperation([&](FixedArr* fixed_arr_ptr) {
+ auto thrower =
+ Thrower(kUpdatedValue, testing::nothrow_ctor);
+ fixed_arr_ptr->fill(thrower);
+ });
+
+ EXPECT_TRUE(
+ test_fill.WithInitialValue(FixedArr(kSmallSize, Thrower(kInitialValue)))
+ .Test());
+ EXPECT_TRUE(
+ test_fill.WithInitialValue(FixedArr(kLargeSize, Thrower(kInitialValue)))
+ .Test());
+}
+
+TEST(FixedArrayExceptionSafety, FillWithAlloc) {
+ auto test_fill = testing::MakeExceptionSafetyTester()
+ .WithContracts(ReadMemory<FixedArrWithAlloc>)
+ .WithOperation([&](FixedArrWithAlloc* fixed_arr_ptr) {
+ auto thrower =
+ Thrower(kUpdatedValue, testing::nothrow_ctor);
+ fixed_arr_ptr->fill(thrower);
+ });
+
+ EXPECT_TRUE(test_fill
+ .WithInitialValue(
+ FixedArrWithAlloc(kSmallSize, Thrower(kInitialValue)))
+ .Test());
+ EXPECT_TRUE(test_fill
+ .WithInitialValue(
+ FixedArrWithAlloc(kLargeSize, Thrower(kInitialValue)))
+ .Test());
+}
+
+} // namespace
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_HAVE_EXCEPTIONS
diff --git a/third_party/abseil/src/absl/container/fixed_array_test.cc b/third_party/abseil/src/absl/container/fixed_array_test.cc
new file mode 100644
index 0000000..49598e7
--- /dev/null
+++ b/third_party/abseil/src/absl/container/fixed_array_test.cc
@@ -0,0 +1,837 @@
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/container/fixed_array.h"
+
+#include <stdio.h>
+
+#include <cstring>
+#include <list>
+#include <memory>
+#include <numeric>
+#include <scoped_allocator>
+#include <stdexcept>
+#include <string>
+#include <vector>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/base/config.h"
+#include "absl/base/internal/exception_testing.h"
+#include "absl/base/options.h"
+#include "absl/container/internal/counting_allocator.h"
+#include "absl/hash/hash_testing.h"
+#include "absl/memory/memory.h"
+
+using ::testing::ElementsAreArray;
+
+namespace {
+
+// Helper routine to determine if a absl::FixedArray used stack allocation.
+template <typename ArrayType>
+static bool IsOnStack(const ArrayType& a) {
+ return a.size() <= ArrayType::inline_elements;
+}
+
+class ConstructionTester {
+ public:
+ ConstructionTester() : self_ptr_(this), value_(0) { constructions++; }
+ ~ConstructionTester() {
+ assert(self_ptr_ == this);
+ self_ptr_ = nullptr;
+ destructions++;
+ }
+
+ // These are incremented as elements are constructed and destructed so we can
+ // be sure all elements are properly cleaned up.
+ static int constructions;
+ static int destructions;
+
+ void CheckConstructed() { assert(self_ptr_ == this); }
+
+ void set(int value) { value_ = value; }
+ int get() { return value_; }
+
+ private:
+ // self_ptr_ should always point to 'this' -- that's how we can be sure the
+ // constructor has been called.
+ ConstructionTester* self_ptr_;
+ int value_;
+};
+
+int ConstructionTester::constructions = 0;
+int ConstructionTester::destructions = 0;
+
+// ThreeInts will initialize its three ints to the value stored in
+// ThreeInts::counter. The constructor increments counter so that each object
+// in an array of ThreeInts will have different values.
+class ThreeInts {
+ public:
+ ThreeInts() {
+ x_ = counter;
+ y_ = counter;
+ z_ = counter;
+ ++counter;
+ }
+
+ static int counter;
+
+ int x_, y_, z_;
+};
+
+int ThreeInts::counter = 0;
+
+TEST(FixedArrayTest, CopyCtor) {
+ absl::FixedArray<int, 10> on_stack(5);
+ std::iota(on_stack.begin(), on_stack.end(), 0);
+ absl::FixedArray<int, 10> stack_copy = on_stack;
+ EXPECT_THAT(stack_copy, ElementsAreArray(on_stack));
+ EXPECT_TRUE(IsOnStack(stack_copy));
+
+ absl::FixedArray<int, 10> allocated(15);
+ std::iota(allocated.begin(), allocated.end(), 0);
+ absl::FixedArray<int, 10> alloced_copy = allocated;
+ EXPECT_THAT(alloced_copy, ElementsAreArray(allocated));
+ EXPECT_FALSE(IsOnStack(alloced_copy));
+}
+
+TEST(FixedArrayTest, MoveCtor) {
+ absl::FixedArray<std::unique_ptr<int>, 10> on_stack(5);
+ for (int i = 0; i < 5; ++i) {
+ on_stack[i] = absl::make_unique<int>(i);
+ }
+
+ absl::FixedArray<std::unique_ptr<int>, 10> stack_copy = std::move(on_stack);
+ for (int i = 0; i < 5; ++i) EXPECT_EQ(*(stack_copy[i]), i);
+ EXPECT_EQ(stack_copy.size(), on_stack.size());
+
+ absl::FixedArray<std::unique_ptr<int>, 10> allocated(15);
+ for (int i = 0; i < 15; ++i) {
+ allocated[i] = absl::make_unique<int>(i);
+ }
+
+ absl::FixedArray<std::unique_ptr<int>, 10> alloced_copy =
+ std::move(allocated);
+ for (int i = 0; i < 15; ++i) EXPECT_EQ(*(alloced_copy[i]), i);
+ EXPECT_EQ(allocated.size(), alloced_copy.size());
+}
+
+TEST(FixedArrayTest, SmallObjects) {
+ // Small object arrays
+ {
+ // Short arrays should be on the stack
+ absl::FixedArray<int> array(4);
+ EXPECT_TRUE(IsOnStack(array));
+ }
+
+ {
+ // Large arrays should be on the heap
+ absl::FixedArray<int> array(1048576);
+ EXPECT_FALSE(IsOnStack(array));
+ }
+
+ {
+ // Arrays of <= default size should be on the stack
+ absl::FixedArray<int, 100> array(100);
+ EXPECT_TRUE(IsOnStack(array));
+ }
+
+ {
+ // Arrays of > default size should be on the heap
+ absl::FixedArray<int, 100> array(101);
+ EXPECT_FALSE(IsOnStack(array));
+ }
+
+ {
+ // Arrays with different size elements should use approximately
+ // same amount of stack space
+ absl::FixedArray<int> array1(0);
+ absl::FixedArray<char> array2(0);
+ EXPECT_LE(sizeof(array1), sizeof(array2) + 100);
+ EXPECT_LE(sizeof(array2), sizeof(array1) + 100);
+ }
+
+ {
+ // Ensure that vectors are properly constructed inside a fixed array.
+ absl::FixedArray<std::vector<int>> array(2);
+ EXPECT_EQ(0, array[0].size());
+ EXPECT_EQ(0, array[1].size());
+ }
+
+ {
+ // Regardless of absl::FixedArray implementation, check that a type with a
+ // low alignment requirement and a non power-of-two size is initialized
+ // correctly.
+ ThreeInts::counter = 1;
+ absl::FixedArray<ThreeInts> array(2);
+ EXPECT_EQ(1, array[0].x_);
+ EXPECT_EQ(1, array[0].y_);
+ EXPECT_EQ(1, array[0].z_);
+ EXPECT_EQ(2, array[1].x_);
+ EXPECT_EQ(2, array[1].y_);
+ EXPECT_EQ(2, array[1].z_);
+ }
+}
+
+TEST(FixedArrayTest, AtThrows) {
+ absl::FixedArray<int> a = {1, 2, 3};
+ EXPECT_EQ(a.at(2), 3);
+ ABSL_BASE_INTERNAL_EXPECT_FAIL(a.at(3), std::out_of_range,
+ "failed bounds check");
+}
+
+TEST(FixedArrayTest, Hardened) {
+#if !defined(NDEBUG) || ABSL_OPTION_HARDENED
+ absl::FixedArray<int> a = {1, 2, 3};
+ EXPECT_EQ(a[2], 3);
+ EXPECT_DEATH_IF_SUPPORTED(a[3], "");
+ EXPECT_DEATH_IF_SUPPORTED(a[-1], "");
+
+ absl::FixedArray<int> empty(0);
+ EXPECT_DEATH_IF_SUPPORTED(empty[0], "");
+ EXPECT_DEATH_IF_SUPPORTED(empty[-1], "");
+ EXPECT_DEATH_IF_SUPPORTED(empty.front(), "");
+ EXPECT_DEATH_IF_SUPPORTED(empty.back(), "");
+#endif
+}
+
+TEST(FixedArrayRelationalsTest, EqualArrays) {
+ for (int i = 0; i < 10; ++i) {
+ absl::FixedArray<int, 5> a1(i);
+ std::iota(a1.begin(), a1.end(), 0);
+ absl::FixedArray<int, 5> a2(a1.begin(), a1.end());
+
+ EXPECT_TRUE(a1 == a2);
+ EXPECT_FALSE(a1 != a2);
+ EXPECT_TRUE(a2 == a1);
+ EXPECT_FALSE(a2 != a1);
+ EXPECT_FALSE(a1 < a2);
+ EXPECT_FALSE(a1 > a2);
+ EXPECT_FALSE(a2 < a1);
+ EXPECT_FALSE(a2 > a1);
+ EXPECT_TRUE(a1 <= a2);
+ EXPECT_TRUE(a1 >= a2);
+ EXPECT_TRUE(a2 <= a1);
+ EXPECT_TRUE(a2 >= a1);
+ }
+}
+
+TEST(FixedArrayRelationalsTest, UnequalArrays) {
+ for (int i = 1; i < 10; ++i) {
+ absl::FixedArray<int, 5> a1(i);
+ std::iota(a1.begin(), a1.end(), 0);
+ absl::FixedArray<int, 5> a2(a1.begin(), a1.end());
+ --a2[i / 2];
+
+ EXPECT_FALSE(a1 == a2);
+ EXPECT_TRUE(a1 != a2);
+ EXPECT_FALSE(a2 == a1);
+ EXPECT_TRUE(a2 != a1);
+ EXPECT_FALSE(a1 < a2);
+ EXPECT_TRUE(a1 > a2);
+ EXPECT_TRUE(a2 < a1);
+ EXPECT_FALSE(a2 > a1);
+ EXPECT_FALSE(a1 <= a2);
+ EXPECT_TRUE(a1 >= a2);
+ EXPECT_TRUE(a2 <= a1);
+ EXPECT_FALSE(a2 >= a1);
+ }
+}
+
+template <int stack_elements>
+static void TestArray(int n) {
+ SCOPED_TRACE(n);
+ SCOPED_TRACE(stack_elements);
+ ConstructionTester::constructions = 0;
+ ConstructionTester::destructions = 0;
+ {
+ absl::FixedArray<ConstructionTester, stack_elements> array(n);
+
+ EXPECT_THAT(array.size(), n);
+ EXPECT_THAT(array.memsize(), sizeof(ConstructionTester) * n);
+ EXPECT_THAT(array.begin() + n, array.end());
+
+ // Check that all elements were constructed
+ for (int i = 0; i < n; i++) {
+ array[i].CheckConstructed();
+ }
+ // Check that no other elements were constructed
+ EXPECT_THAT(ConstructionTester::constructions, n);
+
+ // Test operator[]
+ for (int i = 0; i < n; i++) {
+ array[i].set(i);
+ }
+ for (int i = 0; i < n; i++) {
+ EXPECT_THAT(array[i].get(), i);
+ EXPECT_THAT(array.data()[i].get(), i);
+ }
+
+ // Test data()
+ for (int i = 0; i < n; i++) {
+ array.data()[i].set(i + 1);
+ }
+ for (int i = 0; i < n; i++) {
+ EXPECT_THAT(array[i].get(), i + 1);
+ EXPECT_THAT(array.data()[i].get(), i + 1);
+ }
+ } // Close scope containing 'array'.
+
+ // Check that all constructed elements were destructed.
+ EXPECT_EQ(ConstructionTester::constructions,
+ ConstructionTester::destructions);
+}
+
+template <int elements_per_inner_array, int inline_elements>
+static void TestArrayOfArrays(int n) {
+ SCOPED_TRACE(n);
+ SCOPED_TRACE(inline_elements);
+ SCOPED_TRACE(elements_per_inner_array);
+ ConstructionTester::constructions = 0;
+ ConstructionTester::destructions = 0;
+ {
+ using InnerArray = ConstructionTester[elements_per_inner_array];
+ // Heap-allocate the FixedArray to avoid blowing the stack frame.
+ auto array_ptr =
+ absl::make_unique<absl::FixedArray<InnerArray, inline_elements>>(n);
+ auto& array = *array_ptr;
+
+ ASSERT_EQ(array.size(), n);
+ ASSERT_EQ(array.memsize(),
+ sizeof(ConstructionTester) * elements_per_inner_array * n);
+ ASSERT_EQ(array.begin() + n, array.end());
+
+ // Check that all elements were constructed
+ for (int i = 0; i < n; i++) {
+ for (int j = 0; j < elements_per_inner_array; j++) {
+ (array[i])[j].CheckConstructed();
+ }
+ }
+ // Check that no other elements were constructed
+ ASSERT_EQ(ConstructionTester::constructions, n * elements_per_inner_array);
+
+ // Test operator[]
+ for (int i = 0; i < n; i++) {
+ for (int j = 0; j < elements_per_inner_array; j++) {
+ (array[i])[j].set(i * elements_per_inner_array + j);
+ }
+ }
+ for (int i = 0; i < n; i++) {
+ for (int j = 0; j < elements_per_inner_array; j++) {
+ ASSERT_EQ((array[i])[j].get(), i * elements_per_inner_array + j);
+ ASSERT_EQ((array.data()[i])[j].get(), i * elements_per_inner_array + j);
+ }
+ }
+
+ // Test data()
+ for (int i = 0; i < n; i++) {
+ for (int j = 0; j < elements_per_inner_array; j++) {
+ (array.data()[i])[j].set((i + 1) * elements_per_inner_array + j);
+ }
+ }
+ for (int i = 0; i < n; i++) {
+ for (int j = 0; j < elements_per_inner_array; j++) {
+ ASSERT_EQ((array[i])[j].get(), (i + 1) * elements_per_inner_array + j);
+ ASSERT_EQ((array.data()[i])[j].get(),
+ (i + 1) * elements_per_inner_array + j);
+ }
+ }
+ } // Close scope containing 'array'.
+
+ // Check that all constructed elements were destructed.
+ EXPECT_EQ(ConstructionTester::constructions,
+ ConstructionTester::destructions);
+}
+
+TEST(IteratorConstructorTest, NonInline) {
+ int const kInput[] = {2, 3, 5, 7, 11, 13, 17};
+ absl::FixedArray<int, ABSL_ARRAYSIZE(kInput) - 1> const fixed(
+ kInput, kInput + ABSL_ARRAYSIZE(kInput));
+ ASSERT_EQ(ABSL_ARRAYSIZE(kInput), fixed.size());
+ for (size_t i = 0; i < ABSL_ARRAYSIZE(kInput); ++i) {
+ ASSERT_EQ(kInput[i], fixed[i]);
+ }
+}
+
+TEST(IteratorConstructorTest, Inline) {
+ int const kInput[] = {2, 3, 5, 7, 11, 13, 17};
+ absl::FixedArray<int, ABSL_ARRAYSIZE(kInput)> const fixed(
+ kInput, kInput + ABSL_ARRAYSIZE(kInput));
+ ASSERT_EQ(ABSL_ARRAYSIZE(kInput), fixed.size());
+ for (size_t i = 0; i < ABSL_ARRAYSIZE(kInput); ++i) {
+ ASSERT_EQ(kInput[i], fixed[i]);
+ }
+}
+
+TEST(IteratorConstructorTest, NonPod) {
+ char const* kInput[] = {"red", "orange", "yellow", "green",
+ "blue", "indigo", "violet"};
+ absl::FixedArray<std::string> const fixed(kInput,
+ kInput + ABSL_ARRAYSIZE(kInput));
+ ASSERT_EQ(ABSL_ARRAYSIZE(kInput), fixed.size());
+ for (size_t i = 0; i < ABSL_ARRAYSIZE(kInput); ++i) {
+ ASSERT_EQ(kInput[i], fixed[i]);
+ }
+}
+
+TEST(IteratorConstructorTest, FromEmptyVector) {
+ std::vector<int> const empty;
+ absl::FixedArray<int> const fixed(empty.begin(), empty.end());
+ EXPECT_EQ(0, fixed.size());
+ EXPECT_EQ(empty.size(), fixed.size());
+}
+
+TEST(IteratorConstructorTest, FromNonEmptyVector) {
+ int const kInput[] = {2, 3, 5, 7, 11, 13, 17};
+ std::vector<int> const items(kInput, kInput + ABSL_ARRAYSIZE(kInput));
+ absl::FixedArray<int> const fixed(items.begin(), items.end());
+ ASSERT_EQ(items.size(), fixed.size());
+ for (size_t i = 0; i < items.size(); ++i) {
+ ASSERT_EQ(items[i], fixed[i]);
+ }
+}
+
+TEST(IteratorConstructorTest, FromBidirectionalIteratorRange) {
+ int const kInput[] = {2, 3, 5, 7, 11, 13, 17};
+ std::list<int> const items(kInput, kInput + ABSL_ARRAYSIZE(kInput));
+ absl::FixedArray<int> const fixed(items.begin(), items.end());
+ EXPECT_THAT(fixed, testing::ElementsAreArray(kInput));
+}
+
+TEST(InitListConstructorTest, InitListConstruction) {
+ absl::FixedArray<int> fixed = {1, 2, 3};
+ EXPECT_THAT(fixed, testing::ElementsAreArray({1, 2, 3}));
+}
+
+TEST(FillConstructorTest, NonEmptyArrays) {
+ absl::FixedArray<int> stack_array(4, 1);
+ EXPECT_THAT(stack_array, testing::ElementsAreArray({1, 1, 1, 1}));
+
+ absl::FixedArray<int, 0> heap_array(4, 1);
+ EXPECT_THAT(stack_array, testing::ElementsAreArray({1, 1, 1, 1}));
+}
+
+TEST(FillConstructorTest, EmptyArray) {
+ absl::FixedArray<int> empty_fill(0, 1);
+ absl::FixedArray<int> empty_size(0);
+ EXPECT_EQ(empty_fill, empty_size);
+}
+
+TEST(FillConstructorTest, NotTriviallyCopyable) {
+ std::string str = "abcd";
+ absl::FixedArray<std::string> strings = {str, str, str, str};
+
+ absl::FixedArray<std::string> array(4, str);
+ EXPECT_EQ(array, strings);
+}
+
+TEST(FillConstructorTest, Disambiguation) {
+ absl::FixedArray<size_t> a(1, 2);
+ EXPECT_THAT(a, testing::ElementsAre(2));
+}
+
+TEST(FixedArrayTest, ManySizedArrays) {
+ std::vector<int> sizes;
+ for (int i = 1; i < 100; i++) sizes.push_back(i);
+ for (int i = 100; i <= 1000; i += 100) sizes.push_back(i);
+ for (int n : sizes) {
+ TestArray<0>(n);
+ TestArray<1>(n);
+ TestArray<64>(n);
+ TestArray<1000>(n);
+ }
+}
+
+TEST(FixedArrayTest, ManySizedArraysOfArraysOf1) {
+ for (int n = 1; n < 1000; n++) {
+ ASSERT_NO_FATAL_FAILURE((TestArrayOfArrays<1, 0>(n)));
+ ASSERT_NO_FATAL_FAILURE((TestArrayOfArrays<1, 1>(n)));
+ ASSERT_NO_FATAL_FAILURE((TestArrayOfArrays<1, 64>(n)));
+ ASSERT_NO_FATAL_FAILURE((TestArrayOfArrays<1, 1000>(n)));
+ }
+}
+
+TEST(FixedArrayTest, ManySizedArraysOfArraysOf2) {
+ for (int n = 1; n < 1000; n++) {
+ TestArrayOfArrays<2, 0>(n);
+ TestArrayOfArrays<2, 1>(n);
+ TestArrayOfArrays<2, 64>(n);
+ TestArrayOfArrays<2, 1000>(n);
+ }
+}
+
+// If value_type is put inside of a struct container,
+// we might evoke this error in a hardened build unless data() is carefully
+// written, so check on that.
+// error: call to int __builtin___sprintf_chk(etc...)
+// will always overflow destination buffer [-Werror]
+TEST(FixedArrayTest, AvoidParanoidDiagnostics) {
+ absl::FixedArray<char, 32> buf(32);
+ sprintf(buf.data(), "foo"); // NOLINT(runtime/printf)
+}
+
+TEST(FixedArrayTest, TooBigInlinedSpace) {
+ struct TooBig {
+ char c[1 << 20];
+ }; // too big for even one on the stack
+
+ // Simulate the data members of absl::FixedArray, a pointer and a size_t.
+ struct Data {
+ TooBig* p;
+ size_t size;
+ };
+
+ // Make sure TooBig objects are not inlined for 0 or default size.
+ static_assert(sizeof(absl::FixedArray<TooBig, 0>) == sizeof(Data),
+ "0-sized absl::FixedArray should have same size as Data.");
+ static_assert(alignof(absl::FixedArray<TooBig, 0>) == alignof(Data),
+ "0-sized absl::FixedArray should have same alignment as Data.");
+ static_assert(sizeof(absl::FixedArray<TooBig>) == sizeof(Data),
+ "default-sized absl::FixedArray should have same size as Data");
+ static_assert(
+ alignof(absl::FixedArray<TooBig>) == alignof(Data),
+ "default-sized absl::FixedArray should have same alignment as Data.");
+}
+
+// PickyDelete EXPECTs its class-scope deallocation funcs are unused.
+struct PickyDelete {
+ PickyDelete() {}
+ ~PickyDelete() {}
+ void operator delete(void* p) {
+ EXPECT_TRUE(false) << __FUNCTION__;
+ ::operator delete(p);
+ }
+ void operator delete[](void* p) {
+ EXPECT_TRUE(false) << __FUNCTION__;
+ ::operator delete[](p);
+ }
+};
+
+TEST(FixedArrayTest, UsesGlobalAlloc) { absl::FixedArray<PickyDelete, 0> a(5); }
+
+TEST(FixedArrayTest, Data) {
+ static const int kInput[] = {2, 3, 5, 7, 11, 13, 17};
+ absl::FixedArray<int> fa(std::begin(kInput), std::end(kInput));
+ EXPECT_EQ(fa.data(), &*fa.begin());
+ EXPECT_EQ(fa.data(), &fa[0]);
+
+ const absl::FixedArray<int>& cfa = fa;
+ EXPECT_EQ(cfa.data(), &*cfa.begin());
+ EXPECT_EQ(cfa.data(), &cfa[0]);
+}
+
+TEST(FixedArrayTest, Empty) {
+ absl::FixedArray<int> empty(0);
+ absl::FixedArray<int> inline_filled(1);
+ absl::FixedArray<int, 0> heap_filled(1);
+ EXPECT_TRUE(empty.empty());
+ EXPECT_FALSE(inline_filled.empty());
+ EXPECT_FALSE(heap_filled.empty());
+}
+
+TEST(FixedArrayTest, FrontAndBack) {
+ absl::FixedArray<int, 3 * sizeof(int)> inlined = {1, 2, 3};
+ EXPECT_EQ(inlined.front(), 1);
+ EXPECT_EQ(inlined.back(), 3);
+
+ absl::FixedArray<int, 0> allocated = {1, 2, 3};
+ EXPECT_EQ(allocated.front(), 1);
+ EXPECT_EQ(allocated.back(), 3);
+
+ absl::FixedArray<int> one_element = {1};
+ EXPECT_EQ(one_element.front(), one_element.back());
+}
+
+TEST(FixedArrayTest, ReverseIteratorInlined) {
+ absl::FixedArray<int, 5 * sizeof(int)> a = {0, 1, 2, 3, 4};
+
+ int counter = 5;
+ for (absl::FixedArray<int>::reverse_iterator iter = a.rbegin();
+ iter != a.rend(); ++iter) {
+ counter--;
+ EXPECT_EQ(counter, *iter);
+ }
+ EXPECT_EQ(counter, 0);
+
+ counter = 5;
+ for (absl::FixedArray<int>::const_reverse_iterator iter = a.rbegin();
+ iter != a.rend(); ++iter) {
+ counter--;
+ EXPECT_EQ(counter, *iter);
+ }
+ EXPECT_EQ(counter, 0);
+
+ counter = 5;
+ for (auto iter = a.crbegin(); iter != a.crend(); ++iter) {
+ counter--;
+ EXPECT_EQ(counter, *iter);
+ }
+ EXPECT_EQ(counter, 0);
+}
+
+TEST(FixedArrayTest, ReverseIteratorAllocated) {
+ absl::FixedArray<int, 0> a = {0, 1, 2, 3, 4};
+
+ int counter = 5;
+ for (absl::FixedArray<int>::reverse_iterator iter = a.rbegin();
+ iter != a.rend(); ++iter) {
+ counter--;
+ EXPECT_EQ(counter, *iter);
+ }
+ EXPECT_EQ(counter, 0);
+
+ counter = 5;
+ for (absl::FixedArray<int>::const_reverse_iterator iter = a.rbegin();
+ iter != a.rend(); ++iter) {
+ counter--;
+ EXPECT_EQ(counter, *iter);
+ }
+ EXPECT_EQ(counter, 0);
+
+ counter = 5;
+ for (auto iter = a.crbegin(); iter != a.crend(); ++iter) {
+ counter--;
+ EXPECT_EQ(counter, *iter);
+ }
+ EXPECT_EQ(counter, 0);
+}
+
+TEST(FixedArrayTest, Fill) {
+ absl::FixedArray<int, 5 * sizeof(int)> inlined(5);
+ int fill_val = 42;
+ inlined.fill(fill_val);
+ for (int i : inlined) EXPECT_EQ(i, fill_val);
+
+ absl::FixedArray<int, 0> allocated(5);
+ allocated.fill(fill_val);
+ for (int i : allocated) EXPECT_EQ(i, fill_val);
+
+ // It doesn't do anything, just make sure this compiles.
+ absl::FixedArray<int> empty(0);
+ empty.fill(fill_val);
+}
+
+#ifndef __GNUC__
+TEST(FixedArrayTest, DefaultCtorDoesNotValueInit) {
+ using T = char;
+ constexpr auto capacity = 10;
+ using FixedArrType = absl::FixedArray<T, capacity>;
+ constexpr auto scrubbed_bits = 0x95;
+ constexpr auto length = capacity / 2;
+
+ alignas(FixedArrType) unsigned char buff[sizeof(FixedArrType)];
+ std::memset(std::addressof(buff), scrubbed_bits, sizeof(FixedArrType));
+
+ FixedArrType* arr =
+ ::new (static_cast<void*>(std::addressof(buff))) FixedArrType(length);
+ EXPECT_THAT(*arr, testing::Each(scrubbed_bits));
+ arr->~FixedArrType();
+}
+#endif // __GNUC__
+
+TEST(AllocatorSupportTest, CountInlineAllocations) {
+ constexpr size_t inlined_size = 4;
+ using Alloc = absl::container_internal::CountingAllocator<int>;
+ using AllocFxdArr = absl::FixedArray<int, inlined_size, Alloc>;
+
+ int64_t allocated = 0;
+ int64_t active_instances = 0;
+
+ {
+ const int ia[] = {0, 1, 2, 3, 4, 5, 6, 7};
+
+ Alloc alloc(&allocated, &active_instances);
+
+ AllocFxdArr arr(ia, ia + inlined_size, alloc);
+ static_cast<void>(arr);
+ }
+
+ EXPECT_EQ(allocated, 0);
+ EXPECT_EQ(active_instances, 0);
+}
+
+TEST(AllocatorSupportTest, CountOutoflineAllocations) {
+ constexpr size_t inlined_size = 4;
+ using Alloc = absl::container_internal::CountingAllocator<int>;
+ using AllocFxdArr = absl::FixedArray<int, inlined_size, Alloc>;
+
+ int64_t allocated = 0;
+ int64_t active_instances = 0;
+
+ {
+ const int ia[] = {0, 1, 2, 3, 4, 5, 6, 7};
+ Alloc alloc(&allocated, &active_instances);
+
+ AllocFxdArr arr(ia, ia + ABSL_ARRAYSIZE(ia), alloc);
+
+ EXPECT_EQ(allocated, arr.size() * sizeof(int));
+ static_cast<void>(arr);
+ }
+
+ EXPECT_EQ(active_instances, 0);
+}
+
+TEST(AllocatorSupportTest, CountCopyInlineAllocations) {
+ constexpr size_t inlined_size = 4;
+ using Alloc = absl::container_internal::CountingAllocator<int>;
+ using AllocFxdArr = absl::FixedArray<int, inlined_size, Alloc>;
+
+ int64_t allocated1 = 0;
+ int64_t allocated2 = 0;
+ int64_t active_instances = 0;
+ Alloc alloc(&allocated1, &active_instances);
+ Alloc alloc2(&allocated2, &active_instances);
+
+ {
+ int initial_value = 1;
+
+ AllocFxdArr arr1(inlined_size / 2, initial_value, alloc);
+
+ EXPECT_EQ(allocated1, 0);
+
+ AllocFxdArr arr2(arr1, alloc2);
+
+ EXPECT_EQ(allocated2, 0);
+ static_cast<void>(arr1);
+ static_cast<void>(arr2);
+ }
+
+ EXPECT_EQ(active_instances, 0);
+}
+
+TEST(AllocatorSupportTest, CountCopyOutoflineAllocations) {
+ constexpr size_t inlined_size = 4;
+ using Alloc = absl::container_internal::CountingAllocator<int>;
+ using AllocFxdArr = absl::FixedArray<int, inlined_size, Alloc>;
+
+ int64_t allocated1 = 0;
+ int64_t allocated2 = 0;
+ int64_t active_instances = 0;
+ Alloc alloc(&allocated1, &active_instances);
+ Alloc alloc2(&allocated2, &active_instances);
+
+ {
+ int initial_value = 1;
+
+ AllocFxdArr arr1(inlined_size * 2, initial_value, alloc);
+
+ EXPECT_EQ(allocated1, arr1.size() * sizeof(int));
+
+ AllocFxdArr arr2(arr1, alloc2);
+
+ EXPECT_EQ(allocated2, inlined_size * 2 * sizeof(int));
+ static_cast<void>(arr1);
+ static_cast<void>(arr2);
+ }
+
+ EXPECT_EQ(active_instances, 0);
+}
+
+TEST(AllocatorSupportTest, SizeValAllocConstructor) {
+ using testing::AllOf;
+ using testing::Each;
+ using testing::SizeIs;
+
+ constexpr size_t inlined_size = 4;
+ using Alloc = absl::container_internal::CountingAllocator<int>;
+ using AllocFxdArr = absl::FixedArray<int, inlined_size, Alloc>;
+
+ {
+ auto len = inlined_size / 2;
+ auto val = 0;
+ int64_t allocated = 0;
+ AllocFxdArr arr(len, val, Alloc(&allocated));
+
+ EXPECT_EQ(allocated, 0);
+ EXPECT_THAT(arr, AllOf(SizeIs(len), Each(0)));
+ }
+
+ {
+ auto len = inlined_size * 2;
+ auto val = 0;
+ int64_t allocated = 0;
+ AllocFxdArr arr(len, val, Alloc(&allocated));
+
+ EXPECT_EQ(allocated, len * sizeof(int));
+ EXPECT_THAT(arr, AllOf(SizeIs(len), Each(0)));
+ }
+}
+
+#ifdef ABSL_HAVE_ADDRESS_SANITIZER
+TEST(FixedArrayTest, AddressSanitizerAnnotations1) {
+ absl::FixedArray<int, 32> a(10);
+ int* raw = a.data();
+ raw[0] = 0;
+ raw[9] = 0;
+ EXPECT_DEATH_IF_SUPPORTED(raw[-2] = 0, "container-overflow");
+ EXPECT_DEATH_IF_SUPPORTED(raw[-1] = 0, "container-overflow");
+ EXPECT_DEATH_IF_SUPPORTED(raw[10] = 0, "container-overflow");
+ EXPECT_DEATH_IF_SUPPORTED(raw[31] = 0, "container-overflow");
+}
+
+TEST(FixedArrayTest, AddressSanitizerAnnotations2) {
+ absl::FixedArray<char, 17> a(12);
+ char* raw = a.data();
+ raw[0] = 0;
+ raw[11] = 0;
+ EXPECT_DEATH_IF_SUPPORTED(raw[-7] = 0, "container-overflow");
+ EXPECT_DEATH_IF_SUPPORTED(raw[-1] = 0, "container-overflow");
+ EXPECT_DEATH_IF_SUPPORTED(raw[12] = 0, "container-overflow");
+ EXPECT_DEATH_IF_SUPPORTED(raw[17] = 0, "container-overflow");
+}
+
+TEST(FixedArrayTest, AddressSanitizerAnnotations3) {
+ absl::FixedArray<uint64_t, 20> a(20);
+ uint64_t* raw = a.data();
+ raw[0] = 0;
+ raw[19] = 0;
+ EXPECT_DEATH_IF_SUPPORTED(raw[-1] = 0, "container-overflow");
+ EXPECT_DEATH_IF_SUPPORTED(raw[20] = 0, "container-overflow");
+}
+
+TEST(FixedArrayTest, AddressSanitizerAnnotations4) {
+ absl::FixedArray<ThreeInts> a(10);
+ ThreeInts* raw = a.data();
+ raw[0] = ThreeInts();
+ raw[9] = ThreeInts();
+ // Note: raw[-1] is pointing to 12 bytes before the container range. However,
+ // there is only a 8-byte red zone before the container range, so we only
+ // access the last 4 bytes of the struct to make sure it stays within the red
+ // zone.
+ EXPECT_DEATH_IF_SUPPORTED(raw[-1].z_ = 0, "container-overflow");
+ EXPECT_DEATH_IF_SUPPORTED(raw[10] = ThreeInts(), "container-overflow");
+ // The actual size of storage is kDefaultBytes=256, 21*12 = 252,
+ // so reading raw[21] should still trigger the correct warning.
+ EXPECT_DEATH_IF_SUPPORTED(raw[21] = ThreeInts(), "container-overflow");
+}
+#endif // ABSL_HAVE_ADDRESS_SANITIZER
+
+TEST(FixedArrayTest, AbslHashValueWorks) {
+ using V = absl::FixedArray<int>;
+ std::vector<V> cases;
+
+ // Generate a variety of vectors some of these are small enough for the inline
+ // space but are stored out of line.
+ for (int i = 0; i < 10; ++i) {
+ V v(i);
+ for (int j = 0; j < i; ++j) {
+ v[j] = j;
+ }
+ cases.push_back(v);
+ }
+
+ EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(cases));
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/container/flat_hash_map.h b/third_party/abseil/src/absl/container/flat_hash_map.h
new file mode 100644
index 0000000..74def0d
--- /dev/null
+++ b/third_party/abseil/src/absl/container/flat_hash_map.h
@@ -0,0 +1,606 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: flat_hash_map.h
+// -----------------------------------------------------------------------------
+//
+// An `absl::flat_hash_map<K, V>` is an unordered associative container of
+// unique keys and associated values designed to be a more efficient replacement
+// for `std::unordered_map`. Like `unordered_map`, search, insertion, and
+// deletion of map elements can be done as an `O(1)` operation. However,
+// `flat_hash_map` (and other unordered associative containers known as the
+// collection of Abseil "Swiss tables") contain other optimizations that result
+// in both memory and computation advantages.
+//
+// In most cases, your default choice for a hash map should be a map of type
+// `flat_hash_map`.
+
+#ifndef ABSL_CONTAINER_FLAT_HASH_MAP_H_
+#define ABSL_CONTAINER_FLAT_HASH_MAP_H_
+
+#include <cstddef>
+#include <new>
+#include <type_traits>
+#include <utility>
+
+#include "absl/algorithm/container.h"
+#include "absl/container/internal/container_memory.h"
+#include "absl/container/internal/hash_function_defaults.h" // IWYU pragma: export
+#include "absl/container/internal/raw_hash_map.h" // IWYU pragma: export
+#include "absl/memory/memory.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace container_internal {
+template <class K, class V>
+struct FlatHashMapPolicy;
+} // namespace container_internal
+
+// -----------------------------------------------------------------------------
+// absl::flat_hash_map
+// -----------------------------------------------------------------------------
+//
+// An `absl::flat_hash_map<K, V>` is an unordered associative container which
+// has been optimized for both speed and memory footprint in most common use
+// cases. Its interface is similar to that of `std::unordered_map<K, V>` with
+// the following notable differences:
+//
+// * Requires keys that are CopyConstructible
+// * Requires values that are MoveConstructible
+// * Supports heterogeneous lookup, through `find()`, `operator[]()` and
+// `insert()`, provided that the map is provided a compatible heterogeneous
+// hashing function and equality operator.
+// * Invalidates any references and pointers to elements within the table after
+// `rehash()`.
+// * Contains a `capacity()` member function indicating the number of element
+// slots (open, deleted, and empty) within the hash map.
+// * Returns `void` from the `erase(iterator)` overload.
+//
+// By default, `flat_hash_map` uses the `absl::Hash` hashing framework.
+// All fundamental and Abseil types that support the `absl::Hash` framework have
+// a compatible equality operator for comparing insertions into `flat_hash_map`.
+// If your type is not yet supported by the `absl::Hash` framework, see
+// absl/hash/hash.h for information on extending Abseil hashing to user-defined
+// types.
+//
+// NOTE: A `flat_hash_map` stores its value types directly inside its
+// implementation array to avoid memory indirection. Because a `flat_hash_map`
+// is designed to move data when rehashed, map values will not retain pointer
+// stability. If you require pointer stability, or if your values are large,
+// consider using `absl::flat_hash_map<Key, std::unique_ptr<Value>>` instead.
+// If your types are not moveable or you require pointer stability for keys,
+// consider `absl::node_hash_map`.
+//
+// Example:
+//
+// // Create a flat hash map of three strings (that map to strings)
+// absl::flat_hash_map<std::string, std::string> ducks =
+// {{"a", "huey"}, {"b", "dewey"}, {"c", "louie"}};
+//
+// // Insert a new element into the flat hash map
+// ducks.insert({"d", "donald"});
+//
+// // Force a rehash of the flat hash map
+// ducks.rehash(0);
+//
+// // Find the element with the key "b"
+// std::string search_key = "b";
+// auto result = ducks.find(search_key);
+// if (result != ducks.end()) {
+// std::cout << "Result: " << result->second << std::endl;
+// }
+template <class K, class V,
+ class Hash = absl::container_internal::hash_default_hash<K>,
+ class Eq = absl::container_internal::hash_default_eq<K>,
+ class Allocator = std::allocator<std::pair<const K, V>>>
+class flat_hash_map : public absl::container_internal::raw_hash_map<
+ absl::container_internal::FlatHashMapPolicy<K, V>,
+ Hash, Eq, Allocator> {
+ using Base = typename flat_hash_map::raw_hash_map;
+
+ public:
+ // Constructors and Assignment Operators
+ //
+ // A flat_hash_map supports the same overload set as `std::unordered_map`
+ // for construction and assignment:
+ //
+ // * Default constructor
+ //
+ // // No allocation for the table's elements is made.
+ // absl::flat_hash_map<int, std::string> map1;
+ //
+ // * Initializer List constructor
+ //
+ // absl::flat_hash_map<int, std::string> map2 =
+ // {{1, "huey"}, {2, "dewey"}, {3, "louie"},};
+ //
+ // * Copy constructor
+ //
+ // absl::flat_hash_map<int, std::string> map3(map2);
+ //
+ // * Copy assignment operator
+ //
+ // // Hash functor and Comparator are copied as well
+ // absl::flat_hash_map<int, std::string> map4;
+ // map4 = map3;
+ //
+ // * Move constructor
+ //
+ // // Move is guaranteed efficient
+ // absl::flat_hash_map<int, std::string> map5(std::move(map4));
+ //
+ // * Move assignment operator
+ //
+ // // May be efficient if allocators are compatible
+ // absl::flat_hash_map<int, std::string> map6;
+ // map6 = std::move(map5);
+ //
+ // * Range constructor
+ //
+ // std::vector<std::pair<int, std::string>> v = {{1, "a"}, {2, "b"}};
+ // absl::flat_hash_map<int, std::string> map7(v.begin(), v.end());
+ flat_hash_map() {}
+ using Base::Base;
+
+ // flat_hash_map::begin()
+ //
+ // Returns an iterator to the beginning of the `flat_hash_map`.
+ using Base::begin;
+
+ // flat_hash_map::cbegin()
+ //
+ // Returns a const iterator to the beginning of the `flat_hash_map`.
+ using Base::cbegin;
+
+ // flat_hash_map::cend()
+ //
+ // Returns a const iterator to the end of the `flat_hash_map`.
+ using Base::cend;
+
+ // flat_hash_map::end()
+ //
+ // Returns an iterator to the end of the `flat_hash_map`.
+ using Base::end;
+
+ // flat_hash_map::capacity()
+ //
+ // Returns the number of element slots (assigned, deleted, and empty)
+ // available within the `flat_hash_map`.
+ //
+ // NOTE: this member function is particular to `absl::flat_hash_map` and is
+ // not provided in the `std::unordered_map` API.
+ using Base::capacity;
+
+ // flat_hash_map::empty()
+ //
+ // Returns whether or not the `flat_hash_map` is empty.
+ using Base::empty;
+
+ // flat_hash_map::max_size()
+ //
+ // Returns the largest theoretical possible number of elements within a
+ // `flat_hash_map` under current memory constraints. This value can be thought
+ // of the largest value of `std::distance(begin(), end())` for a
+ // `flat_hash_map<K, V>`.
+ using Base::max_size;
+
+ // flat_hash_map::size()
+ //
+ // Returns the number of elements currently within the `flat_hash_map`.
+ using Base::size;
+
+ // flat_hash_map::clear()
+ //
+ // Removes all elements from the `flat_hash_map`. Invalidates any references,
+ // pointers, or iterators referring to contained elements.
+ //
+ // NOTE: this operation may shrink the underlying buffer. To avoid shrinking
+ // the underlying buffer call `erase(begin(), end())`.
+ using Base::clear;
+
+ // flat_hash_map::erase()
+ //
+ // Erases elements within the `flat_hash_map`. Erasing does not trigger a
+ // rehash. Overloads are listed below.
+ //
+ // void erase(const_iterator pos):
+ //
+ // Erases the element at `position` of the `flat_hash_map`, returning
+ // `void`.
+ //
+ // NOTE: returning `void` in this case is different than that of STL
+ // containers in general and `std::unordered_map` in particular (which
+ // return an iterator to the element following the erased element). If that
+ // iterator is needed, simply post increment the iterator:
+ //
+ // map.erase(it++);
+ //
+ // iterator erase(const_iterator first, const_iterator last):
+ //
+ // Erases the elements in the open interval [`first`, `last`), returning an
+ // iterator pointing to `last`.
+ //
+ // size_type erase(const key_type& key):
+ //
+ // Erases the element with the matching key, if it exists, returning the
+ // number of elements erased (0 or 1).
+ using Base::erase;
+
+ // flat_hash_map::insert()
+ //
+ // Inserts an element of the specified value into the `flat_hash_map`,
+ // returning an iterator pointing to the newly inserted element, provided that
+ // an element with the given key does not already exist. If rehashing occurs
+ // due to the insertion, all iterators are invalidated. Overloads are listed
+ // below.
+ //
+ // std::pair<iterator,bool> insert(const init_type& value):
+ //
+ // Inserts a value into the `flat_hash_map`. Returns a pair consisting of an
+ // iterator to the inserted element (or to the element that prevented the
+ // insertion) and a bool denoting whether the insertion took place.
+ //
+ // std::pair<iterator,bool> insert(T&& value):
+ // std::pair<iterator,bool> insert(init_type&& value):
+ //
+ // Inserts a moveable value into the `flat_hash_map`. Returns a pair
+ // consisting of an iterator to the inserted element (or to the element that
+ // prevented the insertion) and a bool denoting whether the insertion took
+ // place.
+ //
+ // iterator insert(const_iterator hint, const init_type& value):
+ // iterator insert(const_iterator hint, T&& value):
+ // iterator insert(const_iterator hint, init_type&& value);
+ //
+ // Inserts a value, using the position of `hint` as a non-binding suggestion
+ // for where to begin the insertion search. Returns an iterator to the
+ // inserted element, or to the existing element that prevented the
+ // insertion.
+ //
+ // void insert(InputIterator first, InputIterator last):
+ //
+ // Inserts a range of values [`first`, `last`).
+ //
+ // NOTE: Although the STL does not specify which element may be inserted if
+ // multiple keys compare equivalently, for `flat_hash_map` we guarantee the
+ // first match is inserted.
+ //
+ // void insert(std::initializer_list<init_type> ilist):
+ //
+ // Inserts the elements within the initializer list `ilist`.
+ //
+ // NOTE: Although the STL does not specify which element may be inserted if
+ // multiple keys compare equivalently within the initializer list, for
+ // `flat_hash_map` we guarantee the first match is inserted.
+ using Base::insert;
+
+ // flat_hash_map::insert_or_assign()
+ //
+ // Inserts an element of the specified value into the `flat_hash_map` provided
+ // that a value with the given key does not already exist, or replaces it with
+ // the element value if a key for that value already exists, returning an
+ // iterator pointing to the newly inserted element. If rehashing occurs due
+ // to the insertion, all existing iterators are invalidated. Overloads are
+ // listed below.
+ //
+ // pair<iterator, bool> insert_or_assign(const init_type& k, T&& obj):
+ // pair<iterator, bool> insert_or_assign(init_type&& k, T&& obj):
+ //
+ // Inserts/Assigns (or moves) the element of the specified key into the
+ // `flat_hash_map`.
+ //
+ // iterator insert_or_assign(const_iterator hint,
+ // const init_type& k, T&& obj):
+ // iterator insert_or_assign(const_iterator hint, init_type&& k, T&& obj):
+ //
+ // Inserts/Assigns (or moves) the element of the specified key into the
+ // `flat_hash_map` using the position of `hint` as a non-binding suggestion
+ // for where to begin the insertion search.
+ using Base::insert_or_assign;
+
+ // flat_hash_map::emplace()
+ //
+ // Inserts an element of the specified value by constructing it in-place
+ // within the `flat_hash_map`, provided that no element with the given key
+ // already exists.
+ //
+ // The element may be constructed even if there already is an element with the
+ // key in the container, in which case the newly constructed element will be
+ // destroyed immediately. Prefer `try_emplace()` unless your key is not
+ // copyable or moveable.
+ //
+ // If rehashing occurs due to the insertion, all iterators are invalidated.
+ using Base::emplace;
+
+ // flat_hash_map::emplace_hint()
+ //
+ // Inserts an element of the specified value by constructing it in-place
+ // within the `flat_hash_map`, using the position of `hint` as a non-binding
+ // suggestion for where to begin the insertion search, and only inserts
+ // provided that no element with the given key already exists.
+ //
+ // The element may be constructed even if there already is an element with the
+ // key in the container, in which case the newly constructed element will be
+ // destroyed immediately. Prefer `try_emplace()` unless your key is not
+ // copyable or moveable.
+ //
+ // If rehashing occurs due to the insertion, all iterators are invalidated.
+ using Base::emplace_hint;
+
+ // flat_hash_map::try_emplace()
+ //
+ // Inserts an element of the specified value by constructing it in-place
+ // within the `flat_hash_map`, provided that no element with the given key
+ // already exists. Unlike `emplace()`, if an element with the given key
+ // already exists, we guarantee that no element is constructed.
+ //
+ // If rehashing occurs due to the insertion, all iterators are invalidated.
+ // Overloads are listed below.
+ //
+ // pair<iterator, bool> try_emplace(const key_type& k, Args&&... args):
+ // pair<iterator, bool> try_emplace(key_type&& k, Args&&... args):
+ //
+ // Inserts (via copy or move) the element of the specified key into the
+ // `flat_hash_map`.
+ //
+ // iterator try_emplace(const_iterator hint,
+ // const init_type& k, Args&&... args):
+ // iterator try_emplace(const_iterator hint, init_type&& k, Args&&... args):
+ //
+ // Inserts (via copy or move) the element of the specified key into the
+ // `flat_hash_map` using the position of `hint` as a non-binding suggestion
+ // for where to begin the insertion search.
+ //
+ // All `try_emplace()` overloads make the same guarantees regarding rvalue
+ // arguments as `std::unordered_map::try_emplace()`, namely that these
+ // functions will not move from rvalue arguments if insertions do not happen.
+ using Base::try_emplace;
+
+ // flat_hash_map::extract()
+ //
+ // Extracts the indicated element, erasing it in the process, and returns it
+ // as a C++17-compatible node handle. Overloads are listed below.
+ //
+ // node_type extract(const_iterator position):
+ //
+ // Extracts the key,value pair of the element at the indicated position and
+ // returns a node handle owning that extracted data.
+ //
+ // node_type extract(const key_type& x):
+ //
+ // Extracts the key,value pair of the element with a key matching the passed
+ // key value and returns a node handle owning that extracted data. If the
+ // `flat_hash_map` does not contain an element with a matching key, this
+ // function returns an empty node handle.
+ //
+ // NOTE: when compiled in an earlier version of C++ than C++17,
+ // `node_type::key()` returns a const reference to the key instead of a
+ // mutable reference. We cannot safely return a mutable reference without
+ // std::launder (which is not available before C++17).
+ using Base::extract;
+
+ // flat_hash_map::merge()
+ //
+ // Extracts elements from a given `source` flat hash map into this
+ // `flat_hash_map`. If the destination `flat_hash_map` already contains an
+ // element with an equivalent key, that element is not extracted.
+ using Base::merge;
+
+ // flat_hash_map::swap(flat_hash_map& other)
+ //
+ // Exchanges the contents of this `flat_hash_map` with those of the `other`
+ // flat hash map, avoiding invocation of any move, copy, or swap operations on
+ // individual elements.
+ //
+ // All iterators and references on the `flat_hash_map` remain valid, excepting
+ // for the past-the-end iterator, which is invalidated.
+ //
+ // `swap()` requires that the flat hash map's hashing and key equivalence
+ // functions be Swappable, and are exchanged using unqualified calls to
+ // non-member `swap()`. If the map's allocator has
+ // `std::allocator_traits<allocator_type>::propagate_on_container_swap::value`
+ // set to `true`, the allocators are also exchanged using an unqualified call
+ // to non-member `swap()`; otherwise, the allocators are not swapped.
+ using Base::swap;
+
+ // flat_hash_map::rehash(count)
+ //
+ // Rehashes the `flat_hash_map`, setting the number of slots to be at least
+ // the passed value. If the new number of slots increases the load factor more
+ // than the current maximum load factor
+ // (`count` < `size()` / `max_load_factor()`), then the new number of slots
+ // will be at least `size()` / `max_load_factor()`.
+ //
+ // To force a rehash, pass rehash(0).
+ //
+ // NOTE: unlike behavior in `std::unordered_map`, references are also
+ // invalidated upon a `rehash()`.
+ using Base::rehash;
+
+ // flat_hash_map::reserve(count)
+ //
+ // Sets the number of slots in the `flat_hash_map` to the number needed to
+ // accommodate at least `count` total elements without exceeding the current
+ // maximum load factor, and may rehash the container if needed.
+ using Base::reserve;
+
+ // flat_hash_map::at()
+ //
+ // Returns a reference to the mapped value of the element with key equivalent
+ // to the passed key.
+ using Base::at;
+
+ // flat_hash_map::contains()
+ //
+ // Determines whether an element with a key comparing equal to the given `key`
+ // exists within the `flat_hash_map`, returning `true` if so or `false`
+ // otherwise.
+ using Base::contains;
+
+ // flat_hash_map::count(const Key& key) const
+ //
+ // Returns the number of elements with a key comparing equal to the given
+ // `key` within the `flat_hash_map`. note that this function will return
+ // either `1` or `0` since duplicate keys are not allowed within a
+ // `flat_hash_map`.
+ using Base::count;
+
+ // flat_hash_map::equal_range()
+ //
+ // Returns a closed range [first, last], defined by a `std::pair` of two
+ // iterators, containing all elements with the passed key in the
+ // `flat_hash_map`.
+ using Base::equal_range;
+
+ // flat_hash_map::find()
+ //
+ // Finds an element with the passed `key` within the `flat_hash_map`.
+ using Base::find;
+
+ // flat_hash_map::operator[]()
+ //
+ // Returns a reference to the value mapped to the passed key within the
+ // `flat_hash_map`, performing an `insert()` if the key does not already
+ // exist.
+ //
+ // If an insertion occurs and results in a rehashing of the container, all
+ // iterators are invalidated. Otherwise iterators are not affected and
+ // references are not invalidated. Overloads are listed below.
+ //
+ // T& operator[](const Key& key):
+ //
+ // Inserts an init_type object constructed in-place if the element with the
+ // given key does not exist.
+ //
+ // T& operator[](Key&& key):
+ //
+ // Inserts an init_type object constructed in-place provided that an element
+ // with the given key does not exist.
+ using Base::operator[];
+
+ // flat_hash_map::bucket_count()
+ //
+ // Returns the number of "buckets" within the `flat_hash_map`. Note that
+ // because a flat hash map contains all elements within its internal storage,
+ // this value simply equals the current capacity of the `flat_hash_map`.
+ using Base::bucket_count;
+
+ // flat_hash_map::load_factor()
+ //
+ // Returns the current load factor of the `flat_hash_map` (the average number
+ // of slots occupied with a value within the hash map).
+ using Base::load_factor;
+
+ // flat_hash_map::max_load_factor()
+ //
+ // Manages the maximum load factor of the `flat_hash_map`. Overloads are
+ // listed below.
+ //
+ // float flat_hash_map::max_load_factor()
+ //
+ // Returns the current maximum load factor of the `flat_hash_map`.
+ //
+ // void flat_hash_map::max_load_factor(float ml)
+ //
+ // Sets the maximum load factor of the `flat_hash_map` to the passed value.
+ //
+ // NOTE: This overload is provided only for API compatibility with the STL;
+ // `flat_hash_map` will ignore any set load factor and manage its rehashing
+ // internally as an implementation detail.
+ using Base::max_load_factor;
+
+ // flat_hash_map::get_allocator()
+ //
+ // Returns the allocator function associated with this `flat_hash_map`.
+ using Base::get_allocator;
+
+ // flat_hash_map::hash_function()
+ //
+ // Returns the hashing function used to hash the keys within this
+ // `flat_hash_map`.
+ using Base::hash_function;
+
+ // flat_hash_map::key_eq()
+ //
+ // Returns the function used for comparing keys equality.
+ using Base::key_eq;
+};
+
+// erase_if(flat_hash_map<>, Pred)
+//
+// Erases all elements that satisfy the predicate `pred` from the container `c`.
+template <typename K, typename V, typename H, typename E, typename A,
+ typename Predicate>
+void erase_if(flat_hash_map<K, V, H, E, A>& c, Predicate pred) {
+ container_internal::EraseIf(pred, &c);
+}
+
+namespace container_internal {
+
+template <class K, class V>
+struct FlatHashMapPolicy {
+ using slot_policy = container_internal::map_slot_policy<K, V>;
+ using slot_type = typename slot_policy::slot_type;
+ using key_type = K;
+ using mapped_type = V;
+ using init_type = std::pair</*non const*/ key_type, mapped_type>;
+
+ template <class Allocator, class... Args>
+ static void construct(Allocator* alloc, slot_type* slot, Args&&... args) {
+ slot_policy::construct(alloc, slot, std::forward<Args>(args)...);
+ }
+
+ template <class Allocator>
+ static void destroy(Allocator* alloc, slot_type* slot) {
+ slot_policy::destroy(alloc, slot);
+ }
+
+ template <class Allocator>
+ static void transfer(Allocator* alloc, slot_type* new_slot,
+ slot_type* old_slot) {
+ slot_policy::transfer(alloc, new_slot, old_slot);
+ }
+
+ template <class F, class... Args>
+ static decltype(absl::container_internal::DecomposePair(
+ std::declval<F>(), std::declval<Args>()...))
+ apply(F&& f, Args&&... args) {
+ return absl::container_internal::DecomposePair(std::forward<F>(f),
+ std::forward<Args>(args)...);
+ }
+
+ static size_t space_used(const slot_type*) { return 0; }
+
+ static std::pair<const K, V>& element(slot_type* slot) { return slot->value; }
+
+ static V& value(std::pair<const K, V>* kv) { return kv->second; }
+ static const V& value(const std::pair<const K, V>* kv) { return kv->second; }
+};
+
+} // namespace container_internal
+
+namespace container_algorithm_internal {
+
+// Specialization of trait in absl/algorithm/container.h
+template <class Key, class T, class Hash, class KeyEqual, class Allocator>
+struct IsUnorderedContainer<
+ absl::flat_hash_map<Key, T, Hash, KeyEqual, Allocator>> : std::true_type {};
+
+} // namespace container_algorithm_internal
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_CONTAINER_FLAT_HASH_MAP_H_
diff --git a/third_party/abseil/src/absl/container/flat_hash_map_test.cc b/third_party/abseil/src/absl/container/flat_hash_map_test.cc
new file mode 100644
index 0000000..89ec60c
--- /dev/null
+++ b/third_party/abseil/src/absl/container/flat_hash_map_test.cc
@@ -0,0 +1,288 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/container/flat_hash_map.h"
+
+#include <memory>
+
+#include "absl/base/internal/raw_logging.h"
+#include "absl/container/internal/hash_generator_testing.h"
+#include "absl/container/internal/unordered_map_constructor_test.h"
+#include "absl/container/internal/unordered_map_lookup_test.h"
+#include "absl/container/internal/unordered_map_members_test.h"
+#include "absl/container/internal/unordered_map_modifiers_test.h"
+#include "absl/types/any.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace container_internal {
+namespace {
+using ::absl::container_internal::hash_internal::Enum;
+using ::absl::container_internal::hash_internal::EnumClass;
+using ::testing::_;
+using ::testing::IsEmpty;
+using ::testing::Pair;
+using ::testing::UnorderedElementsAre;
+
+// Check that absl::flat_hash_map works in a global constructor.
+struct BeforeMain {
+ BeforeMain() {
+ absl::flat_hash_map<int, int> x;
+ x.insert({1, 1});
+ ABSL_RAW_CHECK(x.find(0) == x.end(), "x should not contain 0");
+ auto it = x.find(1);
+ ABSL_RAW_CHECK(it != x.end(), "x should contain 1");
+ ABSL_RAW_CHECK(it->second, "1 should map to 1");
+ }
+};
+const BeforeMain before_main;
+
+template <class K, class V>
+using Map = flat_hash_map<K, V, StatefulTestingHash, StatefulTestingEqual,
+ Alloc<std::pair<const K, V>>>;
+
+static_assert(!std::is_standard_layout<NonStandardLayout>(), "");
+
+using MapTypes =
+ ::testing::Types<Map<int, int>, Map<std::string, int>,
+ Map<Enum, std::string>, Map<EnumClass, int>,
+ Map<int, NonStandardLayout>, Map<NonStandardLayout, int>>;
+
+INSTANTIATE_TYPED_TEST_SUITE_P(FlatHashMap, ConstructorTest, MapTypes);
+INSTANTIATE_TYPED_TEST_SUITE_P(FlatHashMap, LookupTest, MapTypes);
+INSTANTIATE_TYPED_TEST_SUITE_P(FlatHashMap, MembersTest, MapTypes);
+INSTANTIATE_TYPED_TEST_SUITE_P(FlatHashMap, ModifiersTest, MapTypes);
+
+using UniquePtrMapTypes = ::testing::Types<Map<int, std::unique_ptr<int>>>;
+
+INSTANTIATE_TYPED_TEST_SUITE_P(FlatHashMap, UniquePtrModifiersTest,
+ UniquePtrMapTypes);
+
+TEST(FlatHashMap, StandardLayout) {
+ struct Int {
+ explicit Int(size_t value) : value(value) {}
+ Int() : value(0) { ADD_FAILURE(); }
+ Int(const Int& other) : value(other.value) { ADD_FAILURE(); }
+ Int(Int&&) = default;
+ bool operator==(const Int& other) const { return value == other.value; }
+ size_t value;
+ };
+ static_assert(std::is_standard_layout<Int>(), "");
+
+ struct Hash {
+ size_t operator()(const Int& obj) const { return obj.value; }
+ };
+
+ // Verify that neither the key nor the value get default-constructed or
+ // copy-constructed.
+ {
+ flat_hash_map<Int, Int, Hash> m;
+ m.try_emplace(Int(1), Int(2));
+ m.try_emplace(Int(3), Int(4));
+ m.erase(Int(1));
+ m.rehash(2 * m.bucket_count());
+ }
+ {
+ flat_hash_map<Int, Int, Hash> m;
+ m.try_emplace(Int(1), Int(2));
+ m.try_emplace(Int(3), Int(4));
+ m.erase(Int(1));
+ m.clear();
+ }
+}
+
+// gcc becomes unhappy if this is inside the method, so pull it out here.
+struct balast {};
+
+TEST(FlatHashMap, IteratesMsan) {
+ // Because SwissTable randomizes on pointer addresses, we keep old tables
+ // around to ensure we don't reuse old memory.
+ std::vector<absl::flat_hash_map<int, balast>> garbage;
+ for (int i = 0; i < 100; ++i) {
+ absl::flat_hash_map<int, balast> t;
+ for (int j = 0; j < 100; ++j) {
+ t[j];
+ for (const auto& p : t) EXPECT_THAT(p, Pair(_, _));
+ }
+ garbage.push_back(std::move(t));
+ }
+}
+
+// Demonstration of the "Lazy Key" pattern. This uses heterogeneous insert to
+// avoid creating expensive key elements when the item is already present in the
+// map.
+struct LazyInt {
+ explicit LazyInt(size_t value, int* tracker)
+ : value(value), tracker(tracker) {}
+
+ explicit operator size_t() const {
+ ++*tracker;
+ return value;
+ }
+
+ size_t value;
+ int* tracker;
+};
+
+struct Hash {
+ using is_transparent = void;
+ int* tracker;
+ size_t operator()(size_t obj) const {
+ ++*tracker;
+ return obj;
+ }
+ size_t operator()(const LazyInt& obj) const {
+ ++*tracker;
+ return obj.value;
+ }
+};
+
+struct Eq {
+ using is_transparent = void;
+ bool operator()(size_t lhs, size_t rhs) const {
+ return lhs == rhs;
+ }
+ bool operator()(size_t lhs, const LazyInt& rhs) const {
+ return lhs == rhs.value;
+ }
+};
+
+TEST(FlatHashMap, LazyKeyPattern) {
+ // hashes are only guaranteed in opt mode, we use assertions to track internal
+ // state that can cause extra calls to hash.
+ int conversions = 0;
+ int hashes = 0;
+ flat_hash_map<size_t, size_t, Hash, Eq> m(0, Hash{&hashes});
+ m.reserve(3);
+
+ m[LazyInt(1, &conversions)] = 1;
+ EXPECT_THAT(m, UnorderedElementsAre(Pair(1, 1)));
+ EXPECT_EQ(conversions, 1);
+#ifdef NDEBUG
+ EXPECT_EQ(hashes, 1);
+#endif
+
+ m[LazyInt(1, &conversions)] = 2;
+ EXPECT_THAT(m, UnorderedElementsAre(Pair(1, 2)));
+ EXPECT_EQ(conversions, 1);
+#ifdef NDEBUG
+ EXPECT_EQ(hashes, 2);
+#endif
+
+ m.try_emplace(LazyInt(2, &conversions), 3);
+ EXPECT_THAT(m, UnorderedElementsAre(Pair(1, 2), Pair(2, 3)));
+ EXPECT_EQ(conversions, 2);
+#ifdef NDEBUG
+ EXPECT_EQ(hashes, 3);
+#endif
+
+ m.try_emplace(LazyInt(2, &conversions), 4);
+ EXPECT_THAT(m, UnorderedElementsAre(Pair(1, 2), Pair(2, 3)));
+ EXPECT_EQ(conversions, 2);
+#ifdef NDEBUG
+ EXPECT_EQ(hashes, 4);
+#endif
+}
+
+TEST(FlatHashMap, BitfieldArgument) {
+ union {
+ int n : 1;
+ };
+ n = 0;
+ flat_hash_map<int, int> m;
+ m.erase(n);
+ m.count(n);
+ m.prefetch(n);
+ m.find(n);
+ m.contains(n);
+ m.equal_range(n);
+ m.insert_or_assign(n, n);
+ m.insert_or_assign(m.end(), n, n);
+ m.try_emplace(n);
+ m.try_emplace(m.end(), n);
+ m.at(n);
+ m[n];
+}
+
+TEST(FlatHashMap, MergeExtractInsert) {
+ // We can't test mutable keys, or non-copyable keys with flat_hash_map.
+ // Test that the nodes have the proper API.
+ absl::flat_hash_map<int, int> m = {{1, 7}, {2, 9}};
+ auto node = m.extract(1);
+ EXPECT_TRUE(node);
+ EXPECT_EQ(node.key(), 1);
+ EXPECT_EQ(node.mapped(), 7);
+ EXPECT_THAT(m, UnorderedElementsAre(Pair(2, 9)));
+
+ node.mapped() = 17;
+ m.insert(std::move(node));
+ EXPECT_THAT(m, UnorderedElementsAre(Pair(1, 17), Pair(2, 9)));
+}
+
+bool FirstIsEven(std::pair<const int, int> p) { return p.first % 2 == 0; }
+
+TEST(FlatHashMap, EraseIf) {
+ // Erase all elements.
+ {
+ flat_hash_map<int, int> s = {{1, 1}, {2, 2}, {3, 3}, {4, 4}, {5, 5}};
+ erase_if(s, [](std::pair<const int, int>) { return true; });
+ EXPECT_THAT(s, IsEmpty());
+ }
+ // Erase no elements.
+ {
+ flat_hash_map<int, int> s = {{1, 1}, {2, 2}, {3, 3}, {4, 4}, {5, 5}};
+ erase_if(s, [](std::pair<const int, int>) { return false; });
+ EXPECT_THAT(s, UnorderedElementsAre(Pair(1, 1), Pair(2, 2), Pair(3, 3),
+ Pair(4, 4), Pair(5, 5)));
+ }
+ // Erase specific elements.
+ {
+ flat_hash_map<int, int> s = {{1, 1}, {2, 2}, {3, 3}, {4, 4}, {5, 5}};
+ erase_if(s,
+ [](std::pair<const int, int> kvp) { return kvp.first % 2 == 1; });
+ EXPECT_THAT(s, UnorderedElementsAre(Pair(2, 2), Pair(4, 4)));
+ }
+ // Predicate is function reference.
+ {
+ flat_hash_map<int, int> s = {{1, 1}, {2, 2}, {3, 3}, {4, 4}, {5, 5}};
+ erase_if(s, FirstIsEven);
+ EXPECT_THAT(s, UnorderedElementsAre(Pair(1, 1), Pair(3, 3), Pair(5, 5)));
+ }
+ // Predicate is function pointer.
+ {
+ flat_hash_map<int, int> s = {{1, 1}, {2, 2}, {3, 3}, {4, 4}, {5, 5}};
+ erase_if(s, &FirstIsEven);
+ EXPECT_THAT(s, UnorderedElementsAre(Pair(1, 1), Pair(3, 3), Pair(5, 5)));
+ }
+}
+
+// This test requires std::launder for mutable key access in node handles.
+#if defined(__cpp_lib_launder) && __cpp_lib_launder >= 201606
+TEST(FlatHashMap, NodeHandleMutableKeyAccess) {
+ flat_hash_map<std::string, std::string> map;
+
+ map["key1"] = "mapped";
+
+ auto nh = map.extract(map.begin());
+ nh.key().resize(3);
+ map.insert(std::move(nh));
+
+ EXPECT_THAT(map, testing::ElementsAre(Pair("key", "mapped")));
+}
+#endif
+
+} // namespace
+} // namespace container_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/container/flat_hash_set.h b/third_party/abseil/src/absl/container/flat_hash_set.h
new file mode 100644
index 0000000..6b89da6
--- /dev/null
+++ b/third_party/abseil/src/absl/container/flat_hash_set.h
@@ -0,0 +1,504 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: flat_hash_set.h
+// -----------------------------------------------------------------------------
+//
+// An `absl::flat_hash_set<T>` is an unordered associative container designed to
+// be a more efficient replacement for `std::unordered_set`. Like
+// `unordered_set`, search, insertion, and deletion of set elements can be done
+// as an `O(1)` operation. However, `flat_hash_set` (and other unordered
+// associative containers known as the collection of Abseil "Swiss tables")
+// contain other optimizations that result in both memory and computation
+// advantages.
+//
+// In most cases, your default choice for a hash set should be a set of type
+// `flat_hash_set`.
+#ifndef ABSL_CONTAINER_FLAT_HASH_SET_H_
+#define ABSL_CONTAINER_FLAT_HASH_SET_H_
+
+#include <type_traits>
+#include <utility>
+
+#include "absl/algorithm/container.h"
+#include "absl/base/macros.h"
+#include "absl/container/internal/container_memory.h"
+#include "absl/container/internal/hash_function_defaults.h" // IWYU pragma: export
+#include "absl/container/internal/raw_hash_set.h" // IWYU pragma: export
+#include "absl/memory/memory.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace container_internal {
+template <typename T>
+struct FlatHashSetPolicy;
+} // namespace container_internal
+
+// -----------------------------------------------------------------------------
+// absl::flat_hash_set
+// -----------------------------------------------------------------------------
+//
+// An `absl::flat_hash_set<T>` is an unordered associative container which has
+// been optimized for both speed and memory footprint in most common use cases.
+// Its interface is similar to that of `std::unordered_set<T>` with the
+// following notable differences:
+//
+// * Requires keys that are CopyConstructible
+// * Supports heterogeneous lookup, through `find()` and `insert()`, provided
+// that the set is provided a compatible heterogeneous hashing function and
+// equality operator.
+// * Invalidates any references and pointers to elements within the table after
+// `rehash()`.
+// * Contains a `capacity()` member function indicating the number of element
+// slots (open, deleted, and empty) within the hash set.
+// * Returns `void` from the `erase(iterator)` overload.
+//
+// By default, `flat_hash_set` uses the `absl::Hash` hashing framework. All
+// fundamental and Abseil types that support the `absl::Hash` framework have a
+// compatible equality operator for comparing insertions into `flat_hash_map`.
+// If your type is not yet supported by the `absl::Hash` framework, see
+// absl/hash/hash.h for information on extending Abseil hashing to user-defined
+// types.
+//
+// NOTE: A `flat_hash_set` stores its keys directly inside its implementation
+// array to avoid memory indirection. Because a `flat_hash_set` is designed to
+// move data when rehashed, set keys will not retain pointer stability. If you
+// require pointer stability, consider using
+// `absl::flat_hash_set<std::unique_ptr<T>>`. If your type is not moveable and
+// you require pointer stability, consider `absl::node_hash_set` instead.
+//
+// Example:
+//
+// // Create a flat hash set of three strings
+// absl::flat_hash_set<std::string> ducks =
+// {"huey", "dewey", "louie"};
+//
+// // Insert a new element into the flat hash set
+// ducks.insert("donald");
+//
+// // Force a rehash of the flat hash set
+// ducks.rehash(0);
+//
+// // See if "dewey" is present
+// if (ducks.contains("dewey")) {
+// std::cout << "We found dewey!" << std::endl;
+// }
+template <class T, class Hash = absl::container_internal::hash_default_hash<T>,
+ class Eq = absl::container_internal::hash_default_eq<T>,
+ class Allocator = std::allocator<T>>
+class flat_hash_set
+ : public absl::container_internal::raw_hash_set<
+ absl::container_internal::FlatHashSetPolicy<T>, Hash, Eq, Allocator> {
+ using Base = typename flat_hash_set::raw_hash_set;
+
+ public:
+ // Constructors and Assignment Operators
+ //
+ // A flat_hash_set supports the same overload set as `std::unordered_map`
+ // for construction and assignment:
+ //
+ // * Default constructor
+ //
+ // // No allocation for the table's elements is made.
+ // absl::flat_hash_set<std::string> set1;
+ //
+ // * Initializer List constructor
+ //
+ // absl::flat_hash_set<std::string> set2 =
+ // {{"huey"}, {"dewey"}, {"louie"},};
+ //
+ // * Copy constructor
+ //
+ // absl::flat_hash_set<std::string> set3(set2);
+ //
+ // * Copy assignment operator
+ //
+ // // Hash functor and Comparator are copied as well
+ // absl::flat_hash_set<std::string> set4;
+ // set4 = set3;
+ //
+ // * Move constructor
+ //
+ // // Move is guaranteed efficient
+ // absl::flat_hash_set<std::string> set5(std::move(set4));
+ //
+ // * Move assignment operator
+ //
+ // // May be efficient if allocators are compatible
+ // absl::flat_hash_set<std::string> set6;
+ // set6 = std::move(set5);
+ //
+ // * Range constructor
+ //
+ // std::vector<std::string> v = {"a", "b"};
+ // absl::flat_hash_set<std::string> set7(v.begin(), v.end());
+ flat_hash_set() {}
+ using Base::Base;
+
+ // flat_hash_set::begin()
+ //
+ // Returns an iterator to the beginning of the `flat_hash_set`.
+ using Base::begin;
+
+ // flat_hash_set::cbegin()
+ //
+ // Returns a const iterator to the beginning of the `flat_hash_set`.
+ using Base::cbegin;
+
+ // flat_hash_set::cend()
+ //
+ // Returns a const iterator to the end of the `flat_hash_set`.
+ using Base::cend;
+
+ // flat_hash_set::end()
+ //
+ // Returns an iterator to the end of the `flat_hash_set`.
+ using Base::end;
+
+ // flat_hash_set::capacity()
+ //
+ // Returns the number of element slots (assigned, deleted, and empty)
+ // available within the `flat_hash_set`.
+ //
+ // NOTE: this member function is particular to `absl::flat_hash_set` and is
+ // not provided in the `std::unordered_map` API.
+ using Base::capacity;
+
+ // flat_hash_set::empty()
+ //
+ // Returns whether or not the `flat_hash_set` is empty.
+ using Base::empty;
+
+ // flat_hash_set::max_size()
+ //
+ // Returns the largest theoretical possible number of elements within a
+ // `flat_hash_set` under current memory constraints. This value can be thought
+ // of the largest value of `std::distance(begin(), end())` for a
+ // `flat_hash_set<T>`.
+ using Base::max_size;
+
+ // flat_hash_set::size()
+ //
+ // Returns the number of elements currently within the `flat_hash_set`.
+ using Base::size;
+
+ // flat_hash_set::clear()
+ //
+ // Removes all elements from the `flat_hash_set`. Invalidates any references,
+ // pointers, or iterators referring to contained elements.
+ //
+ // NOTE: this operation may shrink the underlying buffer. To avoid shrinking
+ // the underlying buffer call `erase(begin(), end())`.
+ using Base::clear;
+
+ // flat_hash_set::erase()
+ //
+ // Erases elements within the `flat_hash_set`. Erasing does not trigger a
+ // rehash. Overloads are listed below.
+ //
+ // void erase(const_iterator pos):
+ //
+ // Erases the element at `position` of the `flat_hash_set`, returning
+ // `void`.
+ //
+ // NOTE: returning `void` in this case is different than that of STL
+ // containers in general and `std::unordered_set` in particular (which
+ // return an iterator to the element following the erased element). If that
+ // iterator is needed, simply post increment the iterator:
+ //
+ // set.erase(it++);
+ //
+ // iterator erase(const_iterator first, const_iterator last):
+ //
+ // Erases the elements in the open interval [`first`, `last`), returning an
+ // iterator pointing to `last`.
+ //
+ // size_type erase(const key_type& key):
+ //
+ // Erases the element with the matching key, if it exists, returning the
+ // number of elements erased (0 or 1).
+ using Base::erase;
+
+ // flat_hash_set::insert()
+ //
+ // Inserts an element of the specified value into the `flat_hash_set`,
+ // returning an iterator pointing to the newly inserted element, provided that
+ // an element with the given key does not already exist. If rehashing occurs
+ // due to the insertion, all iterators are invalidated. Overloads are listed
+ // below.
+ //
+ // std::pair<iterator,bool> insert(const T& value):
+ //
+ // Inserts a value into the `flat_hash_set`. Returns a pair consisting of an
+ // iterator to the inserted element (or to the element that prevented the
+ // insertion) and a bool denoting whether the insertion took place.
+ //
+ // std::pair<iterator,bool> insert(T&& value):
+ //
+ // Inserts a moveable value into the `flat_hash_set`. Returns a pair
+ // consisting of an iterator to the inserted element (or to the element that
+ // prevented the insertion) and a bool denoting whether the insertion took
+ // place.
+ //
+ // iterator insert(const_iterator hint, const T& value):
+ // iterator insert(const_iterator hint, T&& value):
+ //
+ // Inserts a value, using the position of `hint` as a non-binding suggestion
+ // for where to begin the insertion search. Returns an iterator to the
+ // inserted element, or to the existing element that prevented the
+ // insertion.
+ //
+ // void insert(InputIterator first, InputIterator last):
+ //
+ // Inserts a range of values [`first`, `last`).
+ //
+ // NOTE: Although the STL does not specify which element may be inserted if
+ // multiple keys compare equivalently, for `flat_hash_set` we guarantee the
+ // first match is inserted.
+ //
+ // void insert(std::initializer_list<T> ilist):
+ //
+ // Inserts the elements within the initializer list `ilist`.
+ //
+ // NOTE: Although the STL does not specify which element may be inserted if
+ // multiple keys compare equivalently within the initializer list, for
+ // `flat_hash_set` we guarantee the first match is inserted.
+ using Base::insert;
+
+ // flat_hash_set::emplace()
+ //
+ // Inserts an element of the specified value by constructing it in-place
+ // within the `flat_hash_set`, provided that no element with the given key
+ // already exists.
+ //
+ // The element may be constructed even if there already is an element with the
+ // key in the container, in which case the newly constructed element will be
+ // destroyed immediately.
+ //
+ // If rehashing occurs due to the insertion, all iterators are invalidated.
+ using Base::emplace;
+
+ // flat_hash_set::emplace_hint()
+ //
+ // Inserts an element of the specified value by constructing it in-place
+ // within the `flat_hash_set`, using the position of `hint` as a non-binding
+ // suggestion for where to begin the insertion search, and only inserts
+ // provided that no element with the given key already exists.
+ //
+ // The element may be constructed even if there already is an element with the
+ // key in the container, in which case the newly constructed element will be
+ // destroyed immediately.
+ //
+ // If rehashing occurs due to the insertion, all iterators are invalidated.
+ using Base::emplace_hint;
+
+ // flat_hash_set::extract()
+ //
+ // Extracts the indicated element, erasing it in the process, and returns it
+ // as a C++17-compatible node handle. Overloads are listed below.
+ //
+ // node_type extract(const_iterator position):
+ //
+ // Extracts the element at the indicated position and returns a node handle
+ // owning that extracted data.
+ //
+ // node_type extract(const key_type& x):
+ //
+ // Extracts the element with the key matching the passed key value and
+ // returns a node handle owning that extracted data. If the `flat_hash_set`
+ // does not contain an element with a matching key, this function returns an
+ // empty node handle.
+ using Base::extract;
+
+ // flat_hash_set::merge()
+ //
+ // Extracts elements from a given `source` flat hash set into this
+ // `flat_hash_set`. If the destination `flat_hash_set` already contains an
+ // element with an equivalent key, that element is not extracted.
+ using Base::merge;
+
+ // flat_hash_set::swap(flat_hash_set& other)
+ //
+ // Exchanges the contents of this `flat_hash_set` with those of the `other`
+ // flat hash map, avoiding invocation of any move, copy, or swap operations on
+ // individual elements.
+ //
+ // All iterators and references on the `flat_hash_set` remain valid, excepting
+ // for the past-the-end iterator, which is invalidated.
+ //
+ // `swap()` requires that the flat hash set's hashing and key equivalence
+ // functions be Swappable, and are exchaged using unqualified calls to
+ // non-member `swap()`. If the map's allocator has
+ // `std::allocator_traits<allocator_type>::propagate_on_container_swap::value`
+ // set to `true`, the allocators are also exchanged using an unqualified call
+ // to non-member `swap()`; otherwise, the allocators are not swapped.
+ using Base::swap;
+
+ // flat_hash_set::rehash(count)
+ //
+ // Rehashes the `flat_hash_set`, setting the number of slots to be at least
+ // the passed value. If the new number of slots increases the load factor more
+ // than the current maximum load factor
+ // (`count` < `size()` / `max_load_factor()`), then the new number of slots
+ // will be at least `size()` / `max_load_factor()`.
+ //
+ // To force a rehash, pass rehash(0).
+ //
+ // NOTE: unlike behavior in `std::unordered_set`, references are also
+ // invalidated upon a `rehash()`.
+ using Base::rehash;
+
+ // flat_hash_set::reserve(count)
+ //
+ // Sets the number of slots in the `flat_hash_set` to the number needed to
+ // accommodate at least `count` total elements without exceeding the current
+ // maximum load factor, and may rehash the container if needed.
+ using Base::reserve;
+
+ // flat_hash_set::contains()
+ //
+ // Determines whether an element comparing equal to the given `key` exists
+ // within the `flat_hash_set`, returning `true` if so or `false` otherwise.
+ using Base::contains;
+
+ // flat_hash_set::count(const Key& key) const
+ //
+ // Returns the number of elements comparing equal to the given `key` within
+ // the `flat_hash_set`. note that this function will return either `1` or `0`
+ // since duplicate elements are not allowed within a `flat_hash_set`.
+ using Base::count;
+
+ // flat_hash_set::equal_range()
+ //
+ // Returns a closed range [first, last], defined by a `std::pair` of two
+ // iterators, containing all elements with the passed key in the
+ // `flat_hash_set`.
+ using Base::equal_range;
+
+ // flat_hash_set::find()
+ //
+ // Finds an element with the passed `key` within the `flat_hash_set`.
+ using Base::find;
+
+ // flat_hash_set::bucket_count()
+ //
+ // Returns the number of "buckets" within the `flat_hash_set`. Note that
+ // because a flat hash map contains all elements within its internal storage,
+ // this value simply equals the current capacity of the `flat_hash_set`.
+ using Base::bucket_count;
+
+ // flat_hash_set::load_factor()
+ //
+ // Returns the current load factor of the `flat_hash_set` (the average number
+ // of slots occupied with a value within the hash map).
+ using Base::load_factor;
+
+ // flat_hash_set::max_load_factor()
+ //
+ // Manages the maximum load factor of the `flat_hash_set`. Overloads are
+ // listed below.
+ //
+ // float flat_hash_set::max_load_factor()
+ //
+ // Returns the current maximum load factor of the `flat_hash_set`.
+ //
+ // void flat_hash_set::max_load_factor(float ml)
+ //
+ // Sets the maximum load factor of the `flat_hash_set` to the passed value.
+ //
+ // NOTE: This overload is provided only for API compatibility with the STL;
+ // `flat_hash_set` will ignore any set load factor and manage its rehashing
+ // internally as an implementation detail.
+ using Base::max_load_factor;
+
+ // flat_hash_set::get_allocator()
+ //
+ // Returns the allocator function associated with this `flat_hash_set`.
+ using Base::get_allocator;
+
+ // flat_hash_set::hash_function()
+ //
+ // Returns the hashing function used to hash the keys within this
+ // `flat_hash_set`.
+ using Base::hash_function;
+
+ // flat_hash_set::key_eq()
+ //
+ // Returns the function used for comparing keys equality.
+ using Base::key_eq;
+};
+
+// erase_if(flat_hash_set<>, Pred)
+//
+// Erases all elements that satisfy the predicate `pred` from the container `c`.
+template <typename T, typename H, typename E, typename A, typename Predicate>
+void erase_if(flat_hash_set<T, H, E, A>& c, Predicate pred) {
+ container_internal::EraseIf(pred, &c);
+}
+
+namespace container_internal {
+
+template <class T>
+struct FlatHashSetPolicy {
+ using slot_type = T;
+ using key_type = T;
+ using init_type = T;
+ using constant_iterators = std::true_type;
+
+ template <class Allocator, class... Args>
+ static void construct(Allocator* alloc, slot_type* slot, Args&&... args) {
+ absl::allocator_traits<Allocator>::construct(*alloc, slot,
+ std::forward<Args>(args)...);
+ }
+
+ template <class Allocator>
+ static void destroy(Allocator* alloc, slot_type* slot) {
+ absl::allocator_traits<Allocator>::destroy(*alloc, slot);
+ }
+
+ template <class Allocator>
+ static void transfer(Allocator* alloc, slot_type* new_slot,
+ slot_type* old_slot) {
+ construct(alloc, new_slot, std::move(*old_slot));
+ destroy(alloc, old_slot);
+ }
+
+ static T& element(slot_type* slot) { return *slot; }
+
+ template <class F, class... Args>
+ static decltype(absl::container_internal::DecomposeValue(
+ std::declval<F>(), std::declval<Args>()...))
+ apply(F&& f, Args&&... args) {
+ return absl::container_internal::DecomposeValue(
+ std::forward<F>(f), std::forward<Args>(args)...);
+ }
+
+ static size_t space_used(const T*) { return 0; }
+};
+} // namespace container_internal
+
+namespace container_algorithm_internal {
+
+// Specialization of trait in absl/algorithm/container.h
+template <class Key, class Hash, class KeyEqual, class Allocator>
+struct IsUnorderedContainer<absl::flat_hash_set<Key, Hash, KeyEqual, Allocator>>
+ : std::true_type {};
+
+} // namespace container_algorithm_internal
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_CONTAINER_FLAT_HASH_SET_H_
diff --git a/third_party/abseil/src/absl/container/flat_hash_set_test.cc b/third_party/abseil/src/absl/container/flat_hash_set_test.cc
new file mode 100644
index 0000000..8f6f994
--- /dev/null
+++ b/third_party/abseil/src/absl/container/flat_hash_set_test.cc
@@ -0,0 +1,178 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/container/flat_hash_set.h"
+
+#include <vector>
+
+#include "absl/base/internal/raw_logging.h"
+#include "absl/container/internal/hash_generator_testing.h"
+#include "absl/container/internal/unordered_set_constructor_test.h"
+#include "absl/container/internal/unordered_set_lookup_test.h"
+#include "absl/container/internal/unordered_set_members_test.h"
+#include "absl/container/internal/unordered_set_modifiers_test.h"
+#include "absl/memory/memory.h"
+#include "absl/strings/string_view.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace container_internal {
+namespace {
+
+using ::absl::container_internal::hash_internal::Enum;
+using ::absl::container_internal::hash_internal::EnumClass;
+using ::testing::IsEmpty;
+using ::testing::Pointee;
+using ::testing::UnorderedElementsAre;
+using ::testing::UnorderedElementsAreArray;
+
+// Check that absl::flat_hash_set works in a global constructor.
+struct BeforeMain {
+ BeforeMain() {
+ absl::flat_hash_set<int> x;
+ x.insert(1);
+ ABSL_RAW_CHECK(!x.contains(0), "x should not contain 0");
+ ABSL_RAW_CHECK(x.contains(1), "x should contain 1");
+ }
+};
+const BeforeMain before_main;
+
+template <class T>
+using Set =
+ absl::flat_hash_set<T, StatefulTestingHash, StatefulTestingEqual, Alloc<T>>;
+
+using SetTypes =
+ ::testing::Types<Set<int>, Set<std::string>, Set<Enum>, Set<EnumClass>>;
+
+INSTANTIATE_TYPED_TEST_SUITE_P(FlatHashSet, ConstructorTest, SetTypes);
+INSTANTIATE_TYPED_TEST_SUITE_P(FlatHashSet, LookupTest, SetTypes);
+INSTANTIATE_TYPED_TEST_SUITE_P(FlatHashSet, MembersTest, SetTypes);
+INSTANTIATE_TYPED_TEST_SUITE_P(FlatHashSet, ModifiersTest, SetTypes);
+
+TEST(FlatHashSet, EmplaceString) {
+ std::vector<std::string> v = {"a", "b"};
+ absl::flat_hash_set<absl::string_view> hs(v.begin(), v.end());
+ EXPECT_THAT(hs, UnorderedElementsAreArray(v));
+}
+
+TEST(FlatHashSet, BitfieldArgument) {
+ union {
+ int n : 1;
+ };
+ n = 0;
+ absl::flat_hash_set<int> s = {n};
+ s.insert(n);
+ s.insert(s.end(), n);
+ s.insert({n});
+ s.erase(n);
+ s.count(n);
+ s.prefetch(n);
+ s.find(n);
+ s.contains(n);
+ s.equal_range(n);
+}
+
+TEST(FlatHashSet, MergeExtractInsert) {
+ struct Hash {
+ size_t operator()(const std::unique_ptr<int>& p) const { return *p; }
+ };
+ struct Eq {
+ bool operator()(const std::unique_ptr<int>& a,
+ const std::unique_ptr<int>& b) const {
+ return *a == *b;
+ }
+ };
+ absl::flat_hash_set<std::unique_ptr<int>, Hash, Eq> set1, set2;
+ set1.insert(absl::make_unique<int>(7));
+ set1.insert(absl::make_unique<int>(17));
+
+ set2.insert(absl::make_unique<int>(7));
+ set2.insert(absl::make_unique<int>(19));
+
+ EXPECT_THAT(set1, UnorderedElementsAre(Pointee(7), Pointee(17)));
+ EXPECT_THAT(set2, UnorderedElementsAre(Pointee(7), Pointee(19)));
+
+ set1.merge(set2);
+
+ EXPECT_THAT(set1, UnorderedElementsAre(Pointee(7), Pointee(17), Pointee(19)));
+ EXPECT_THAT(set2, UnorderedElementsAre(Pointee(7)));
+
+ auto node = set1.extract(absl::make_unique<int>(7));
+ EXPECT_TRUE(node);
+ EXPECT_THAT(node.value(), Pointee(7));
+ EXPECT_THAT(set1, UnorderedElementsAre(Pointee(17), Pointee(19)));
+
+ auto insert_result = set2.insert(std::move(node));
+ EXPECT_FALSE(node);
+ EXPECT_FALSE(insert_result.inserted);
+ EXPECT_TRUE(insert_result.node);
+ EXPECT_THAT(insert_result.node.value(), Pointee(7));
+ EXPECT_EQ(**insert_result.position, 7);
+ EXPECT_NE(insert_result.position->get(), insert_result.node.value().get());
+ EXPECT_THAT(set2, UnorderedElementsAre(Pointee(7)));
+
+ node = set1.extract(absl::make_unique<int>(17));
+ EXPECT_TRUE(node);
+ EXPECT_THAT(node.value(), Pointee(17));
+ EXPECT_THAT(set1, UnorderedElementsAre(Pointee(19)));
+
+ node.value() = absl::make_unique<int>(23);
+
+ insert_result = set2.insert(std::move(node));
+ EXPECT_FALSE(node);
+ EXPECT_TRUE(insert_result.inserted);
+ EXPECT_FALSE(insert_result.node);
+ EXPECT_EQ(**insert_result.position, 23);
+ EXPECT_THAT(set2, UnorderedElementsAre(Pointee(7), Pointee(23)));
+}
+
+bool IsEven(int k) { return k % 2 == 0; }
+
+TEST(FlatHashSet, EraseIf) {
+ // Erase all elements.
+ {
+ flat_hash_set<int> s = {1, 2, 3, 4, 5};
+ erase_if(s, [](int) { return true; });
+ EXPECT_THAT(s, IsEmpty());
+ }
+ // Erase no elements.
+ {
+ flat_hash_set<int> s = {1, 2, 3, 4, 5};
+ erase_if(s, [](int) { return false; });
+ EXPECT_THAT(s, UnorderedElementsAre(1, 2, 3, 4, 5));
+ }
+ // Erase specific elements.
+ {
+ flat_hash_set<int> s = {1, 2, 3, 4, 5};
+ erase_if(s, [](int k) { return k % 2 == 1; });
+ EXPECT_THAT(s, UnorderedElementsAre(2, 4));
+ }
+ // Predicate is function reference.
+ {
+ flat_hash_set<int> s = {1, 2, 3, 4, 5};
+ erase_if(s, IsEven);
+ EXPECT_THAT(s, UnorderedElementsAre(1, 3, 5));
+ }
+ // Predicate is function pointer.
+ {
+ flat_hash_set<int> s = {1, 2, 3, 4, 5};
+ erase_if(s, &IsEven);
+ EXPECT_THAT(s, UnorderedElementsAre(1, 3, 5));
+ }
+}
+
+} // namespace
+} // namespace container_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/container/inlined_vector.h b/third_party/abseil/src/absl/container/inlined_vector.h
new file mode 100644
index 0000000..90bb96e
--- /dev/null
+++ b/third_party/abseil/src/absl/container/inlined_vector.h
@@ -0,0 +1,845 @@
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: inlined_vector.h
+// -----------------------------------------------------------------------------
+//
+// This header file contains the declaration and definition of an "inlined
+// vector" which behaves in an equivalent fashion to a `std::vector`, except
+// that storage for small sequences of the vector are provided inline without
+// requiring any heap allocation.
+//
+// An `absl::InlinedVector<T, N>` specifies the default capacity `N` as one of
+// its template parameters. Instances where `size() <= N` hold contained
+// elements in inline space. Typically `N` is very small so that sequences that
+// are expected to be short do not require allocations.
+//
+// An `absl::InlinedVector` does not usually require a specific allocator. If
+// the inlined vector grows beyond its initial constraints, it will need to
+// allocate (as any normal `std::vector` would). This is usually performed with
+// the default allocator (defined as `std::allocator<T>`). Optionally, a custom
+// allocator type may be specified as `A` in `absl::InlinedVector<T, N, A>`.
+
+#ifndef ABSL_CONTAINER_INLINED_VECTOR_H_
+#define ABSL_CONTAINER_INLINED_VECTOR_H_
+
+#include <algorithm>
+#include <cassert>
+#include <cstddef>
+#include <cstdlib>
+#include <cstring>
+#include <initializer_list>
+#include <iterator>
+#include <memory>
+#include <type_traits>
+#include <utility>
+
+#include "absl/algorithm/algorithm.h"
+#include "absl/base/internal/throw_delegate.h"
+#include "absl/base/macros.h"
+#include "absl/base/optimization.h"
+#include "absl/base/port.h"
+#include "absl/container/internal/inlined_vector.h"
+#include "absl/memory/memory.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+// -----------------------------------------------------------------------------
+// InlinedVector
+// -----------------------------------------------------------------------------
+//
+// An `absl::InlinedVector` is designed to be a drop-in replacement for
+// `std::vector` for use cases where the vector's size is sufficiently small
+// that it can be inlined. If the inlined vector does grow beyond its estimated
+// capacity, it will trigger an initial allocation on the heap, and will behave
+// as a `std::vector`. The API of the `absl::InlinedVector` within this file is
+// designed to cover the same API footprint as covered by `std::vector`.
+template <typename T, size_t N, typename A = std::allocator<T>>
+class InlinedVector {
+ static_assert(N > 0, "`absl::InlinedVector` requires an inlined capacity.");
+
+ using Storage = inlined_vector_internal::Storage<T, N, A>;
+
+ using AllocatorTraits = typename Storage::AllocatorTraits;
+ using RValueReference = typename Storage::RValueReference;
+ using MoveIterator = typename Storage::MoveIterator;
+ using IsMemcpyOk = typename Storage::IsMemcpyOk;
+
+ template <typename Iterator>
+ using IteratorValueAdapter =
+ typename Storage::template IteratorValueAdapter<Iterator>;
+ using CopyValueAdapter = typename Storage::CopyValueAdapter;
+ using DefaultValueAdapter = typename Storage::DefaultValueAdapter;
+
+ template <typename Iterator>
+ using EnableIfAtLeastForwardIterator = absl::enable_if_t<
+ inlined_vector_internal::IsAtLeastForwardIterator<Iterator>::value>;
+ template <typename Iterator>
+ using DisableIfAtLeastForwardIterator = absl::enable_if_t<
+ !inlined_vector_internal::IsAtLeastForwardIterator<Iterator>::value>;
+
+ public:
+ using allocator_type = typename Storage::allocator_type;
+ using value_type = typename Storage::value_type;
+ using pointer = typename Storage::pointer;
+ using const_pointer = typename Storage::const_pointer;
+ using size_type = typename Storage::size_type;
+ using difference_type = typename Storage::difference_type;
+ using reference = typename Storage::reference;
+ using const_reference = typename Storage::const_reference;
+ using iterator = typename Storage::iterator;
+ using const_iterator = typename Storage::const_iterator;
+ using reverse_iterator = typename Storage::reverse_iterator;
+ using const_reverse_iterator = typename Storage::const_reverse_iterator;
+
+ // ---------------------------------------------------------------------------
+ // InlinedVector Constructors and Destructor
+ // ---------------------------------------------------------------------------
+
+ // Creates an empty inlined vector with a value-initialized allocator.
+ InlinedVector() noexcept(noexcept(allocator_type())) : storage_() {}
+
+ // Creates an empty inlined vector with a copy of `alloc`.
+ explicit InlinedVector(const allocator_type& alloc) noexcept
+ : storage_(alloc) {}
+
+ // Creates an inlined vector with `n` copies of `value_type()`.
+ explicit InlinedVector(size_type n,
+ const allocator_type& alloc = allocator_type())
+ : storage_(alloc) {
+ storage_.Initialize(DefaultValueAdapter(), n);
+ }
+
+ // Creates an inlined vector with `n` copies of `v`.
+ InlinedVector(size_type n, const_reference v,
+ const allocator_type& alloc = allocator_type())
+ : storage_(alloc) {
+ storage_.Initialize(CopyValueAdapter(v), n);
+ }
+
+ // Creates an inlined vector with copies of the elements of `list`.
+ InlinedVector(std::initializer_list<value_type> list,
+ const allocator_type& alloc = allocator_type())
+ : InlinedVector(list.begin(), list.end(), alloc) {}
+
+ // Creates an inlined vector with elements constructed from the provided
+ // forward iterator range [`first`, `last`).
+ //
+ // NOTE: the `enable_if` prevents ambiguous interpretation between a call to
+ // this constructor with two integral arguments and a call to the above
+ // `InlinedVector(size_type, const_reference)` constructor.
+ template <typename ForwardIterator,
+ EnableIfAtLeastForwardIterator<ForwardIterator>* = nullptr>
+ InlinedVector(ForwardIterator first, ForwardIterator last,
+ const allocator_type& alloc = allocator_type())
+ : storage_(alloc) {
+ storage_.Initialize(IteratorValueAdapter<ForwardIterator>(first),
+ std::distance(first, last));
+ }
+
+ // Creates an inlined vector with elements constructed from the provided input
+ // iterator range [`first`, `last`).
+ template <typename InputIterator,
+ DisableIfAtLeastForwardIterator<InputIterator>* = nullptr>
+ InlinedVector(InputIterator first, InputIterator last,
+ const allocator_type& alloc = allocator_type())
+ : storage_(alloc) {
+ std::copy(first, last, std::back_inserter(*this));
+ }
+
+ // Creates an inlined vector by copying the contents of `other` using
+ // `other`'s allocator.
+ InlinedVector(const InlinedVector& other)
+ : InlinedVector(other, *other.storage_.GetAllocPtr()) {}
+
+ // Creates an inlined vector by copying the contents of `other` using `alloc`.
+ InlinedVector(const InlinedVector& other, const allocator_type& alloc)
+ : storage_(alloc) {
+ if (IsMemcpyOk::value && !other.storage_.GetIsAllocated()) {
+ storage_.MemcpyFrom(other.storage_);
+ } else {
+ storage_.Initialize(IteratorValueAdapter<const_pointer>(other.data()),
+ other.size());
+ }
+ }
+
+ // Creates an inlined vector by moving in the contents of `other` without
+ // allocating. If `other` contains allocated memory, the newly-created inlined
+ // vector will take ownership of that memory. However, if `other` does not
+ // contain allocated memory, the newly-created inlined vector will perform
+ // element-wise move construction of the contents of `other`.
+ //
+ // NOTE: since no allocation is performed for the inlined vector in either
+ // case, the `noexcept(...)` specification depends on whether moving the
+ // underlying objects can throw. It is assumed assumed that...
+ // a) move constructors should only throw due to allocation failure.
+ // b) if `value_type`'s move constructor allocates, it uses the same
+ // allocation function as the inlined vector's allocator.
+ // Thus, the move constructor is non-throwing if the allocator is non-throwing
+ // or `value_type`'s move constructor is specified as `noexcept`.
+ InlinedVector(InlinedVector&& other) noexcept(
+ absl::allocator_is_nothrow<allocator_type>::value ||
+ std::is_nothrow_move_constructible<value_type>::value)
+ : storage_(*other.storage_.GetAllocPtr()) {
+ if (IsMemcpyOk::value) {
+ storage_.MemcpyFrom(other.storage_);
+
+ other.storage_.SetInlinedSize(0);
+ } else if (other.storage_.GetIsAllocated()) {
+ storage_.SetAllocatedData(other.storage_.GetAllocatedData(),
+ other.storage_.GetAllocatedCapacity());
+ storage_.SetAllocatedSize(other.storage_.GetSize());
+
+ other.storage_.SetInlinedSize(0);
+ } else {
+ IteratorValueAdapter<MoveIterator> other_values(
+ MoveIterator(other.storage_.GetInlinedData()));
+
+ inlined_vector_internal::ConstructElements(
+ storage_.GetAllocPtr(), storage_.GetInlinedData(), &other_values,
+ other.storage_.GetSize());
+
+ storage_.SetInlinedSize(other.storage_.GetSize());
+ }
+ }
+
+ // Creates an inlined vector by moving in the contents of `other` with a copy
+ // of `alloc`.
+ //
+ // NOTE: if `other`'s allocator is not equal to `alloc`, even if `other`
+ // contains allocated memory, this move constructor will still allocate. Since
+ // allocation is performed, this constructor can only be `noexcept` if the
+ // specified allocator is also `noexcept`.
+ InlinedVector(InlinedVector&& other, const allocator_type& alloc) noexcept(
+ absl::allocator_is_nothrow<allocator_type>::value)
+ : storage_(alloc) {
+ if (IsMemcpyOk::value) {
+ storage_.MemcpyFrom(other.storage_);
+
+ other.storage_.SetInlinedSize(0);
+ } else if ((*storage_.GetAllocPtr() == *other.storage_.GetAllocPtr()) &&
+ other.storage_.GetIsAllocated()) {
+ storage_.SetAllocatedData(other.storage_.GetAllocatedData(),
+ other.storage_.GetAllocatedCapacity());
+ storage_.SetAllocatedSize(other.storage_.GetSize());
+
+ other.storage_.SetInlinedSize(0);
+ } else {
+ storage_.Initialize(
+ IteratorValueAdapter<MoveIterator>(MoveIterator(other.data())),
+ other.size());
+ }
+ }
+
+ ~InlinedVector() {}
+
+ // ---------------------------------------------------------------------------
+ // InlinedVector Member Accessors
+ // ---------------------------------------------------------------------------
+
+ // `InlinedVector::empty()`
+ //
+ // Returns whether the inlined vector contains no elements.
+ bool empty() const noexcept { return !size(); }
+
+ // `InlinedVector::size()`
+ //
+ // Returns the number of elements in the inlined vector.
+ size_type size() const noexcept { return storage_.GetSize(); }
+
+ // `InlinedVector::max_size()`
+ //
+ // Returns the maximum number of elements the inlined vector can hold.
+ size_type max_size() const noexcept {
+ // One bit of the size storage is used to indicate whether the inlined
+ // vector contains allocated memory. As a result, the maximum size that the
+ // inlined vector can express is half of the max for `size_type`.
+ return (std::numeric_limits<size_type>::max)() / 2;
+ }
+
+ // `InlinedVector::capacity()`
+ //
+ // Returns the number of elements that could be stored in the inlined vector
+ // without requiring a reallocation.
+ //
+ // NOTE: for most inlined vectors, `capacity()` should be equal to the
+ // template parameter `N`. For inlined vectors which exceed this capacity,
+ // they will no longer be inlined and `capacity()` will equal the capactity of
+ // the allocated memory.
+ size_type capacity() const noexcept {
+ return storage_.GetIsAllocated() ? storage_.GetAllocatedCapacity()
+ : storage_.GetInlinedCapacity();
+ }
+
+ // `InlinedVector::data()`
+ //
+ // Returns a `pointer` to the elements of the inlined vector. This pointer
+ // can be used to access and modify the contained elements.
+ //
+ // NOTE: only elements within [`data()`, `data() + size()`) are valid.
+ pointer data() noexcept {
+ return storage_.GetIsAllocated() ? storage_.GetAllocatedData()
+ : storage_.GetInlinedData();
+ }
+
+ // Overload of `InlinedVector::data()` that returns a `const_pointer` to the
+ // elements of the inlined vector. This pointer can be used to access but not
+ // modify the contained elements.
+ //
+ // NOTE: only elements within [`data()`, `data() + size()`) are valid.
+ const_pointer data() const noexcept {
+ return storage_.GetIsAllocated() ? storage_.GetAllocatedData()
+ : storage_.GetInlinedData();
+ }
+
+ // `InlinedVector::operator[](...)`
+ //
+ // Returns a `reference` to the `i`th element of the inlined vector.
+ reference operator[](size_type i) {
+ ABSL_HARDENING_ASSERT(i < size());
+ return data()[i];
+ }
+
+ // Overload of `InlinedVector::operator[](...)` that returns a
+ // `const_reference` to the `i`th element of the inlined vector.
+ const_reference operator[](size_type i) const {
+ ABSL_HARDENING_ASSERT(i < size());
+ return data()[i];
+ }
+
+ // `InlinedVector::at(...)`
+ //
+ // Returns a `reference` to the `i`th element of the inlined vector.
+ //
+ // NOTE: if `i` is not within the required range of `InlinedVector::at(...)`,
+ // in both debug and non-debug builds, `std::out_of_range` will be thrown.
+ reference at(size_type i) {
+ if (ABSL_PREDICT_FALSE(i >= size())) {
+ base_internal::ThrowStdOutOfRange(
+ "`InlinedVector::at(size_type)` failed bounds check");
+ }
+ return data()[i];
+ }
+
+ // Overload of `InlinedVector::at(...)` that returns a `const_reference` to
+ // the `i`th element of the inlined vector.
+ //
+ // NOTE: if `i` is not within the required range of `InlinedVector::at(...)`,
+ // in both debug and non-debug builds, `std::out_of_range` will be thrown.
+ const_reference at(size_type i) const {
+ if (ABSL_PREDICT_FALSE(i >= size())) {
+ base_internal::ThrowStdOutOfRange(
+ "`InlinedVector::at(size_type) const` failed bounds check");
+ }
+ return data()[i];
+ }
+
+ // `InlinedVector::front()`
+ //
+ // Returns a `reference` to the first element of the inlined vector.
+ reference front() {
+ ABSL_HARDENING_ASSERT(!empty());
+ return data()[0];
+ }
+
+ // Overload of `InlinedVector::front()` that returns a `const_reference` to
+ // the first element of the inlined vector.
+ const_reference front() const {
+ ABSL_HARDENING_ASSERT(!empty());
+ return data()[0];
+ }
+
+ // `InlinedVector::back()`
+ //
+ // Returns a `reference` to the last element of the inlined vector.
+ reference back() {
+ ABSL_HARDENING_ASSERT(!empty());
+ return data()[size() - 1];
+ }
+
+ // Overload of `InlinedVector::back()` that returns a `const_reference` to the
+ // last element of the inlined vector.
+ const_reference back() const {
+ ABSL_HARDENING_ASSERT(!empty());
+ return data()[size() - 1];
+ }
+
+ // `InlinedVector::begin()`
+ //
+ // Returns an `iterator` to the beginning of the inlined vector.
+ iterator begin() noexcept { return data(); }
+
+ // Overload of `InlinedVector::begin()` that returns a `const_iterator` to
+ // the beginning of the inlined vector.
+ const_iterator begin() const noexcept { return data(); }
+
+ // `InlinedVector::end()`
+ //
+ // Returns an `iterator` to the end of the inlined vector.
+ iterator end() noexcept { return data() + size(); }
+
+ // Overload of `InlinedVector::end()` that returns a `const_iterator` to the
+ // end of the inlined vector.
+ const_iterator end() const noexcept { return data() + size(); }
+
+ // `InlinedVector::cbegin()`
+ //
+ // Returns a `const_iterator` to the beginning of the inlined vector.
+ const_iterator cbegin() const noexcept { return begin(); }
+
+ // `InlinedVector::cend()`
+ //
+ // Returns a `const_iterator` to the end of the inlined vector.
+ const_iterator cend() const noexcept { return end(); }
+
+ // `InlinedVector::rbegin()`
+ //
+ // Returns a `reverse_iterator` from the end of the inlined vector.
+ reverse_iterator rbegin() noexcept { return reverse_iterator(end()); }
+
+ // Overload of `InlinedVector::rbegin()` that returns a
+ // `const_reverse_iterator` from the end of the inlined vector.
+ const_reverse_iterator rbegin() const noexcept {
+ return const_reverse_iterator(end());
+ }
+
+ // `InlinedVector::rend()`
+ //
+ // Returns a `reverse_iterator` from the beginning of the inlined vector.
+ reverse_iterator rend() noexcept { return reverse_iterator(begin()); }
+
+ // Overload of `InlinedVector::rend()` that returns a `const_reverse_iterator`
+ // from the beginning of the inlined vector.
+ const_reverse_iterator rend() const noexcept {
+ return const_reverse_iterator(begin());
+ }
+
+ // `InlinedVector::crbegin()`
+ //
+ // Returns a `const_reverse_iterator` from the end of the inlined vector.
+ const_reverse_iterator crbegin() const noexcept { return rbegin(); }
+
+ // `InlinedVector::crend()`
+ //
+ // Returns a `const_reverse_iterator` from the beginning of the inlined
+ // vector.
+ const_reverse_iterator crend() const noexcept { return rend(); }
+
+ // `InlinedVector::get_allocator()`
+ //
+ // Returns a copy of the inlined vector's allocator.
+ allocator_type get_allocator() const { return *storage_.GetAllocPtr(); }
+
+ // ---------------------------------------------------------------------------
+ // InlinedVector Member Mutators
+ // ---------------------------------------------------------------------------
+
+ // `InlinedVector::operator=(...)`
+ //
+ // Replaces the elements of the inlined vector with copies of the elements of
+ // `list`.
+ InlinedVector& operator=(std::initializer_list<value_type> list) {
+ assign(list.begin(), list.end());
+
+ return *this;
+ }
+
+ // Overload of `InlinedVector::operator=(...)` that replaces the elements of
+ // the inlined vector with copies of the elements of `other`.
+ InlinedVector& operator=(const InlinedVector& other) {
+ if (ABSL_PREDICT_TRUE(this != std::addressof(other))) {
+ const_pointer other_data = other.data();
+ assign(other_data, other_data + other.size());
+ }
+
+ return *this;
+ }
+
+ // Overload of `InlinedVector::operator=(...)` that moves the elements of
+ // `other` into the inlined vector.
+ //
+ // NOTE: as a result of calling this overload, `other` is left in a valid but
+ // unspecified state.
+ InlinedVector& operator=(InlinedVector&& other) {
+ if (ABSL_PREDICT_TRUE(this != std::addressof(other))) {
+ if (IsMemcpyOk::value || other.storage_.GetIsAllocated()) {
+ inlined_vector_internal::DestroyElements(storage_.GetAllocPtr(), data(),
+ size());
+ storage_.DeallocateIfAllocated();
+ storage_.MemcpyFrom(other.storage_);
+
+ other.storage_.SetInlinedSize(0);
+ } else {
+ storage_.Assign(IteratorValueAdapter<MoveIterator>(
+ MoveIterator(other.storage_.GetInlinedData())),
+ other.size());
+ }
+ }
+
+ return *this;
+ }
+
+ // `InlinedVector::assign(...)`
+ //
+ // Replaces the contents of the inlined vector with `n` copies of `v`.
+ void assign(size_type n, const_reference v) {
+ storage_.Assign(CopyValueAdapter(v), n);
+ }
+
+ // Overload of `InlinedVector::assign(...)` that replaces the contents of the
+ // inlined vector with copies of the elements of `list`.
+ void assign(std::initializer_list<value_type> list) {
+ assign(list.begin(), list.end());
+ }
+
+ // Overload of `InlinedVector::assign(...)` to replace the contents of the
+ // inlined vector with the range [`first`, `last`).
+ //
+ // NOTE: this overload is for iterators that are "forward" category or better.
+ template <typename ForwardIterator,
+ EnableIfAtLeastForwardIterator<ForwardIterator>* = nullptr>
+ void assign(ForwardIterator first, ForwardIterator last) {
+ storage_.Assign(IteratorValueAdapter<ForwardIterator>(first),
+ std::distance(first, last));
+ }
+
+ // Overload of `InlinedVector::assign(...)` to replace the contents of the
+ // inlined vector with the range [`first`, `last`).
+ //
+ // NOTE: this overload is for iterators that are "input" category.
+ template <typename InputIterator,
+ DisableIfAtLeastForwardIterator<InputIterator>* = nullptr>
+ void assign(InputIterator first, InputIterator last) {
+ size_type i = 0;
+ for (; i < size() && first != last; ++i, static_cast<void>(++first)) {
+ data()[i] = *first;
+ }
+
+ erase(data() + i, data() + size());
+ std::copy(first, last, std::back_inserter(*this));
+ }
+
+ // `InlinedVector::resize(...)`
+ //
+ // Resizes the inlined vector to contain `n` elements.
+ //
+ // NOTE: If `n` is smaller than `size()`, extra elements are destroyed. If `n`
+ // is larger than `size()`, new elements are value-initialized.
+ void resize(size_type n) {
+ ABSL_HARDENING_ASSERT(n <= max_size());
+ storage_.Resize(DefaultValueAdapter(), n);
+ }
+
+ // Overload of `InlinedVector::resize(...)` that resizes the inlined vector to
+ // contain `n` elements.
+ //
+ // NOTE: if `n` is smaller than `size()`, extra elements are destroyed. If `n`
+ // is larger than `size()`, new elements are copied-constructed from `v`.
+ void resize(size_type n, const_reference v) {
+ ABSL_HARDENING_ASSERT(n <= max_size());
+ storage_.Resize(CopyValueAdapter(v), n);
+ }
+
+ // `InlinedVector::insert(...)`
+ //
+ // Inserts a copy of `v` at `pos`, returning an `iterator` to the newly
+ // inserted element.
+ iterator insert(const_iterator pos, const_reference v) {
+ return emplace(pos, v);
+ }
+
+ // Overload of `InlinedVector::insert(...)` that inserts `v` at `pos` using
+ // move semantics, returning an `iterator` to the newly inserted element.
+ iterator insert(const_iterator pos, RValueReference v) {
+ return emplace(pos, std::move(v));
+ }
+
+ // Overload of `InlinedVector::insert(...)` that inserts `n` contiguous copies
+ // of `v` starting at `pos`, returning an `iterator` pointing to the first of
+ // the newly inserted elements.
+ iterator insert(const_iterator pos, size_type n, const_reference v) {
+ ABSL_HARDENING_ASSERT(pos >= begin());
+ ABSL_HARDENING_ASSERT(pos <= end());
+
+ if (ABSL_PREDICT_TRUE(n != 0)) {
+ value_type dealias = v;
+ return storage_.Insert(pos, CopyValueAdapter(dealias), n);
+ } else {
+ return const_cast<iterator>(pos);
+ }
+ }
+
+ // Overload of `InlinedVector::insert(...)` that inserts copies of the
+ // elements of `list` starting at `pos`, returning an `iterator` pointing to
+ // the first of the newly inserted elements.
+ iterator insert(const_iterator pos, std::initializer_list<value_type> list) {
+ return insert(pos, list.begin(), list.end());
+ }
+
+ // Overload of `InlinedVector::insert(...)` that inserts the range [`first`,
+ // `last`) starting at `pos`, returning an `iterator` pointing to the first
+ // of the newly inserted elements.
+ //
+ // NOTE: this overload is for iterators that are "forward" category or better.
+ template <typename ForwardIterator,
+ EnableIfAtLeastForwardIterator<ForwardIterator>* = nullptr>
+ iterator insert(const_iterator pos, ForwardIterator first,
+ ForwardIterator last) {
+ ABSL_HARDENING_ASSERT(pos >= begin());
+ ABSL_HARDENING_ASSERT(pos <= end());
+
+ if (ABSL_PREDICT_TRUE(first != last)) {
+ return storage_.Insert(pos, IteratorValueAdapter<ForwardIterator>(first),
+ std::distance(first, last));
+ } else {
+ return const_cast<iterator>(pos);
+ }
+ }
+
+ // Overload of `InlinedVector::insert(...)` that inserts the range [`first`,
+ // `last`) starting at `pos`, returning an `iterator` pointing to the first
+ // of the newly inserted elements.
+ //
+ // NOTE: this overload is for iterators that are "input" category.
+ template <typename InputIterator,
+ DisableIfAtLeastForwardIterator<InputIterator>* = nullptr>
+ iterator insert(const_iterator pos, InputIterator first, InputIterator last) {
+ ABSL_HARDENING_ASSERT(pos >= begin());
+ ABSL_HARDENING_ASSERT(pos <= end());
+
+ size_type index = std::distance(cbegin(), pos);
+ for (size_type i = index; first != last; ++i, static_cast<void>(++first)) {
+ insert(data() + i, *first);
+ }
+
+ return iterator(data() + index);
+ }
+
+ // `InlinedVector::emplace(...)`
+ //
+ // Constructs and inserts an element using `args...` in the inlined vector at
+ // `pos`, returning an `iterator` pointing to the newly emplaced element.
+ template <typename... Args>
+ iterator emplace(const_iterator pos, Args&&... args) {
+ ABSL_HARDENING_ASSERT(pos >= begin());
+ ABSL_HARDENING_ASSERT(pos <= end());
+
+ value_type dealias(std::forward<Args>(args)...);
+ return storage_.Insert(pos,
+ IteratorValueAdapter<MoveIterator>(
+ MoveIterator(std::addressof(dealias))),
+ 1);
+ }
+
+ // `InlinedVector::emplace_back(...)`
+ //
+ // Constructs and inserts an element using `args...` in the inlined vector at
+ // `end()`, returning a `reference` to the newly emplaced element.
+ template <typename... Args>
+ reference emplace_back(Args&&... args) {
+ return storage_.EmplaceBack(std::forward<Args>(args)...);
+ }
+
+ // `InlinedVector::push_back(...)`
+ //
+ // Inserts a copy of `v` in the inlined vector at `end()`.
+ void push_back(const_reference v) { static_cast<void>(emplace_back(v)); }
+
+ // Overload of `InlinedVector::push_back(...)` for inserting `v` at `end()`
+ // using move semantics.
+ void push_back(RValueReference v) {
+ static_cast<void>(emplace_back(std::move(v)));
+ }
+
+ // `InlinedVector::pop_back()`
+ //
+ // Destroys the element at `back()`, reducing the size by `1`.
+ void pop_back() noexcept {
+ ABSL_HARDENING_ASSERT(!empty());
+
+ AllocatorTraits::destroy(*storage_.GetAllocPtr(), data() + (size() - 1));
+ storage_.SubtractSize(1);
+ }
+
+ // `InlinedVector::erase(...)`
+ //
+ // Erases the element at `pos`, returning an `iterator` pointing to where the
+ // erased element was located.
+ //
+ // NOTE: may return `end()`, which is not dereferencable.
+ iterator erase(const_iterator pos) {
+ ABSL_HARDENING_ASSERT(pos >= begin());
+ ABSL_HARDENING_ASSERT(pos < end());
+
+ return storage_.Erase(pos, pos + 1);
+ }
+
+ // Overload of `InlinedVector::erase(...)` that erases every element in the
+ // range [`from`, `to`), returning an `iterator` pointing to where the first
+ // erased element was located.
+ //
+ // NOTE: may return `end()`, which is not dereferencable.
+ iterator erase(const_iterator from, const_iterator to) {
+ ABSL_HARDENING_ASSERT(from >= begin());
+ ABSL_HARDENING_ASSERT(from <= to);
+ ABSL_HARDENING_ASSERT(to <= end());
+
+ if (ABSL_PREDICT_TRUE(from != to)) {
+ return storage_.Erase(from, to);
+ } else {
+ return const_cast<iterator>(from);
+ }
+ }
+
+ // `InlinedVector::clear()`
+ //
+ // Destroys all elements in the inlined vector, setting the size to `0` and
+ // deallocating any held memory.
+ void clear() noexcept {
+ inlined_vector_internal::DestroyElements(storage_.GetAllocPtr(), data(),
+ size());
+ storage_.DeallocateIfAllocated();
+
+ storage_.SetInlinedSize(0);
+ }
+
+ // `InlinedVector::reserve(...)`
+ //
+ // Ensures that there is enough room for at least `n` elements.
+ void reserve(size_type n) { storage_.Reserve(n); }
+
+ // `InlinedVector::shrink_to_fit()`
+ //
+ // Reduces memory usage by freeing unused memory. After being called, calls to
+ // `capacity()` will be equal to `max(N, size())`.
+ //
+ // If `size() <= N` and the inlined vector contains allocated memory, the
+ // elements will all be moved to the inlined space and the allocated memory
+ // will be deallocated.
+ //
+ // If `size() > N` and `size() < capacity()`, the elements will be moved to a
+ // smaller allocation.
+ void shrink_to_fit() {
+ if (storage_.GetIsAllocated()) {
+ storage_.ShrinkToFit();
+ }
+ }
+
+ // `InlinedVector::swap(...)`
+ //
+ // Swaps the contents of the inlined vector with `other`.
+ void swap(InlinedVector& other) {
+ if (ABSL_PREDICT_TRUE(this != std::addressof(other))) {
+ storage_.Swap(std::addressof(other.storage_));
+ }
+ }
+
+ private:
+ template <typename H, typename TheT, size_t TheN, typename TheA>
+ friend H AbslHashValue(H h, const absl::InlinedVector<TheT, TheN, TheA>& a);
+
+ Storage storage_;
+};
+
+// -----------------------------------------------------------------------------
+// InlinedVector Non-Member Functions
+// -----------------------------------------------------------------------------
+
+// `swap(...)`
+//
+// Swaps the contents of two inlined vectors.
+template <typename T, size_t N, typename A>
+void swap(absl::InlinedVector<T, N, A>& a,
+ absl::InlinedVector<T, N, A>& b) noexcept(noexcept(a.swap(b))) {
+ a.swap(b);
+}
+
+// `operator==(...)`
+//
+// Tests for value-equality of two inlined vectors.
+template <typename T, size_t N, typename A>
+bool operator==(const absl::InlinedVector<T, N, A>& a,
+ const absl::InlinedVector<T, N, A>& b) {
+ auto a_data = a.data();
+ auto b_data = b.data();
+ return absl::equal(a_data, a_data + a.size(), b_data, b_data + b.size());
+}
+
+// `operator!=(...)`
+//
+// Tests for value-inequality of two inlined vectors.
+template <typename T, size_t N, typename A>
+bool operator!=(const absl::InlinedVector<T, N, A>& a,
+ const absl::InlinedVector<T, N, A>& b) {
+ return !(a == b);
+}
+
+// `operator<(...)`
+//
+// Tests whether the value of an inlined vector is less than the value of
+// another inlined vector using a lexicographical comparison algorithm.
+template <typename T, size_t N, typename A>
+bool operator<(const absl::InlinedVector<T, N, A>& a,
+ const absl::InlinedVector<T, N, A>& b) {
+ auto a_data = a.data();
+ auto b_data = b.data();
+ return std::lexicographical_compare(a_data, a_data + a.size(), b_data,
+ b_data + b.size());
+}
+
+// `operator>(...)`
+//
+// Tests whether the value of an inlined vector is greater than the value of
+// another inlined vector using a lexicographical comparison algorithm.
+template <typename T, size_t N, typename A>
+bool operator>(const absl::InlinedVector<T, N, A>& a,
+ const absl::InlinedVector<T, N, A>& b) {
+ return b < a;
+}
+
+// `operator<=(...)`
+//
+// Tests whether the value of an inlined vector is less than or equal to the
+// value of another inlined vector using a lexicographical comparison algorithm.
+template <typename T, size_t N, typename A>
+bool operator<=(const absl::InlinedVector<T, N, A>& a,
+ const absl::InlinedVector<T, N, A>& b) {
+ return !(b < a);
+}
+
+// `operator>=(...)`
+//
+// Tests whether the value of an inlined vector is greater than or equal to the
+// value of another inlined vector using a lexicographical comparison algorithm.
+template <typename T, size_t N, typename A>
+bool operator>=(const absl::InlinedVector<T, N, A>& a,
+ const absl::InlinedVector<T, N, A>& b) {
+ return !(a < b);
+}
+
+// `AbslHashValue(...)`
+//
+// Provides `absl::Hash` support for `absl::InlinedVector`. It is uncommon to
+// call this directly.
+template <typename H, typename T, size_t N, typename A>
+H AbslHashValue(H h, const absl::InlinedVector<T, N, A>& a) {
+ auto size = a.size();
+ return H::combine(H::combine_contiguous(std::move(h), a.data(), size), size);
+}
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_CONTAINER_INLINED_VECTOR_H_
diff --git a/third_party/abseil/src/absl/container/inlined_vector_benchmark.cc b/third_party/abseil/src/absl/container/inlined_vector_benchmark.cc
new file mode 100644
index 0000000..b8dafe9
--- /dev/null
+++ b/third_party/abseil/src/absl/container/inlined_vector_benchmark.cc
@@ -0,0 +1,807 @@
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <array>
+#include <string>
+#include <vector>
+
+#include "benchmark/benchmark.h"
+#include "absl/base/internal/raw_logging.h"
+#include "absl/base/macros.h"
+#include "absl/container/inlined_vector.h"
+#include "absl/strings/str_cat.h"
+
+namespace {
+
+void BM_InlinedVectorFill(benchmark::State& state) {
+ const int len = state.range(0);
+ absl::InlinedVector<int, 8> v;
+ v.reserve(len);
+ for (auto _ : state) {
+ v.resize(0); // Use resize(0) as InlinedVector releases storage on clear().
+ for (int i = 0; i < len; ++i) {
+ v.push_back(i);
+ }
+ benchmark::DoNotOptimize(v);
+ }
+}
+BENCHMARK(BM_InlinedVectorFill)->Range(1, 256);
+
+void BM_InlinedVectorFillRange(benchmark::State& state) {
+ const int len = state.range(0);
+ const std::vector<int> src(len, len);
+ absl::InlinedVector<int, 8> v;
+ v.reserve(len);
+ for (auto _ : state) {
+ benchmark::DoNotOptimize(src);
+ v.assign(src.begin(), src.end());
+ benchmark::DoNotOptimize(v);
+ }
+}
+BENCHMARK(BM_InlinedVectorFillRange)->Range(1, 256);
+
+void BM_StdVectorFill(benchmark::State& state) {
+ const int len = state.range(0);
+ std::vector<int> v;
+ v.reserve(len);
+ for (auto _ : state) {
+ v.clear();
+ for (int i = 0; i < len; ++i) {
+ v.push_back(i);
+ }
+ benchmark::DoNotOptimize(v);
+ }
+}
+BENCHMARK(BM_StdVectorFill)->Range(1, 256);
+
+// The purpose of the next two benchmarks is to verify that
+// absl::InlinedVector is efficient when moving is more efficent than
+// copying. To do so, we use strings that are larger than the short
+// string optimization.
+bool StringRepresentedInline(std::string s) {
+ const char* chars = s.data();
+ std::string s1 = std::move(s);
+ return s1.data() != chars;
+}
+
+int GetNonShortStringOptimizationSize() {
+ for (int i = 24; i <= 192; i *= 2) {
+ if (!StringRepresentedInline(std::string(i, 'A'))) {
+ return i;
+ }
+ }
+ ABSL_RAW_LOG(
+ FATAL,
+ "Failed to find a string larger than the short string optimization");
+ return -1;
+}
+
+void BM_InlinedVectorFillString(benchmark::State& state) {
+ const int len = state.range(0);
+ const int no_sso = GetNonShortStringOptimizationSize();
+ std::string strings[4] = {std::string(no_sso, 'A'), std::string(no_sso, 'B'),
+ std::string(no_sso, 'C'), std::string(no_sso, 'D')};
+
+ for (auto _ : state) {
+ absl::InlinedVector<std::string, 8> v;
+ for (int i = 0; i < len; i++) {
+ v.push_back(strings[i & 3]);
+ }
+ }
+ state.SetItemsProcessed(static_cast<int64_t>(state.iterations()) * len);
+}
+BENCHMARK(BM_InlinedVectorFillString)->Range(0, 1024);
+
+void BM_StdVectorFillString(benchmark::State& state) {
+ const int len = state.range(0);
+ const int no_sso = GetNonShortStringOptimizationSize();
+ std::string strings[4] = {std::string(no_sso, 'A'), std::string(no_sso, 'B'),
+ std::string(no_sso, 'C'), std::string(no_sso, 'D')};
+
+ for (auto _ : state) {
+ std::vector<std::string> v;
+ for (int i = 0; i < len; i++) {
+ v.push_back(strings[i & 3]);
+ }
+ }
+ state.SetItemsProcessed(static_cast<int64_t>(state.iterations()) * len);
+}
+BENCHMARK(BM_StdVectorFillString)->Range(0, 1024);
+
+struct Buffer { // some arbitrary structure for benchmarking.
+ char* base;
+ int length;
+ int capacity;
+ void* user_data;
+};
+
+void BM_InlinedVectorAssignments(benchmark::State& state) {
+ const int len = state.range(0);
+ using BufferVec = absl::InlinedVector<Buffer, 2>;
+
+ BufferVec src;
+ src.resize(len);
+
+ BufferVec dst;
+ for (auto _ : state) {
+ benchmark::DoNotOptimize(dst);
+ benchmark::DoNotOptimize(src);
+ dst = src;
+ }
+}
+BENCHMARK(BM_InlinedVectorAssignments)
+ ->Arg(0)
+ ->Arg(1)
+ ->Arg(2)
+ ->Arg(3)
+ ->Arg(4)
+ ->Arg(20);
+
+void BM_CreateFromContainer(benchmark::State& state) {
+ for (auto _ : state) {
+ absl::InlinedVector<int, 4> src{1, 2, 3};
+ benchmark::DoNotOptimize(src);
+ absl::InlinedVector<int, 4> dst(std::move(src));
+ benchmark::DoNotOptimize(dst);
+ }
+}
+BENCHMARK(BM_CreateFromContainer);
+
+struct LargeCopyableOnly {
+ LargeCopyableOnly() : d(1024, 17) {}
+ LargeCopyableOnly(const LargeCopyableOnly& o) = default;
+ LargeCopyableOnly& operator=(const LargeCopyableOnly& o) = default;
+
+ std::vector<int> d;
+};
+
+struct LargeCopyableSwappable {
+ LargeCopyableSwappable() : d(1024, 17) {}
+
+ LargeCopyableSwappable(const LargeCopyableSwappable& o) = default;
+
+ LargeCopyableSwappable& operator=(LargeCopyableSwappable o) {
+ using std::swap;
+ swap(*this, o);
+ return *this;
+ }
+
+ friend void swap(LargeCopyableSwappable& a, LargeCopyableSwappable& b) {
+ using std::swap;
+ swap(a.d, b.d);
+ }
+
+ std::vector<int> d;
+};
+
+struct LargeCopyableMovable {
+ LargeCopyableMovable() : d(1024, 17) {}
+ // Use implicitly defined copy and move.
+
+ std::vector<int> d;
+};
+
+struct LargeCopyableMovableSwappable {
+ LargeCopyableMovableSwappable() : d(1024, 17) {}
+ LargeCopyableMovableSwappable(const LargeCopyableMovableSwappable& o) =
+ default;
+ LargeCopyableMovableSwappable(LargeCopyableMovableSwappable&& o) = default;
+
+ LargeCopyableMovableSwappable& operator=(LargeCopyableMovableSwappable o) {
+ using std::swap;
+ swap(*this, o);
+ return *this;
+ }
+ LargeCopyableMovableSwappable& operator=(LargeCopyableMovableSwappable&& o) =
+ default;
+
+ friend void swap(LargeCopyableMovableSwappable& a,
+ LargeCopyableMovableSwappable& b) {
+ using std::swap;
+ swap(a.d, b.d);
+ }
+
+ std::vector<int> d;
+};
+
+template <typename ElementType>
+void BM_SwapElements(benchmark::State& state) {
+ const int len = state.range(0);
+ using Vec = absl::InlinedVector<ElementType, 32>;
+ Vec a(len);
+ Vec b;
+ for (auto _ : state) {
+ using std::swap;
+ benchmark::DoNotOptimize(a);
+ benchmark::DoNotOptimize(b);
+ swap(a, b);
+ }
+}
+BENCHMARK_TEMPLATE(BM_SwapElements, LargeCopyableOnly)->Range(0, 1024);
+BENCHMARK_TEMPLATE(BM_SwapElements, LargeCopyableSwappable)->Range(0, 1024);
+BENCHMARK_TEMPLATE(BM_SwapElements, LargeCopyableMovable)->Range(0, 1024);
+BENCHMARK_TEMPLATE(BM_SwapElements, LargeCopyableMovableSwappable)
+ ->Range(0, 1024);
+
+// The following benchmark is meant to track the efficiency of the vector size
+// as a function of stored type via the benchmark label. It is not meant to
+// output useful sizeof operator performance. The loop is a dummy operation
+// to fulfill the requirement of running the benchmark.
+template <typename VecType>
+void BM_Sizeof(benchmark::State& state) {
+ int size = 0;
+ for (auto _ : state) {
+ VecType vec;
+ size = sizeof(vec);
+ }
+ state.SetLabel(absl::StrCat("sz=", size));
+}
+BENCHMARK_TEMPLATE(BM_Sizeof, absl::InlinedVector<char, 1>);
+BENCHMARK_TEMPLATE(BM_Sizeof, absl::InlinedVector<char, 4>);
+BENCHMARK_TEMPLATE(BM_Sizeof, absl::InlinedVector<char, 7>);
+BENCHMARK_TEMPLATE(BM_Sizeof, absl::InlinedVector<char, 8>);
+
+BENCHMARK_TEMPLATE(BM_Sizeof, absl::InlinedVector<int, 1>);
+BENCHMARK_TEMPLATE(BM_Sizeof, absl::InlinedVector<int, 4>);
+BENCHMARK_TEMPLATE(BM_Sizeof, absl::InlinedVector<int, 7>);
+BENCHMARK_TEMPLATE(BM_Sizeof, absl::InlinedVector<int, 8>);
+
+BENCHMARK_TEMPLATE(BM_Sizeof, absl::InlinedVector<void*, 1>);
+BENCHMARK_TEMPLATE(BM_Sizeof, absl::InlinedVector<void*, 4>);
+BENCHMARK_TEMPLATE(BM_Sizeof, absl::InlinedVector<void*, 7>);
+BENCHMARK_TEMPLATE(BM_Sizeof, absl::InlinedVector<void*, 8>);
+
+BENCHMARK_TEMPLATE(BM_Sizeof, absl::InlinedVector<std::string, 1>);
+BENCHMARK_TEMPLATE(BM_Sizeof, absl::InlinedVector<std::string, 4>);
+BENCHMARK_TEMPLATE(BM_Sizeof, absl::InlinedVector<std::string, 7>);
+BENCHMARK_TEMPLATE(BM_Sizeof, absl::InlinedVector<std::string, 8>);
+
+void BM_InlinedVectorIndexInlined(benchmark::State& state) {
+ absl::InlinedVector<int, 8> v = {1, 2, 3, 4, 5, 6, 7};
+ for (auto _ : state) {
+ benchmark::DoNotOptimize(v);
+ benchmark::DoNotOptimize(v[4]);
+ }
+}
+BENCHMARK(BM_InlinedVectorIndexInlined);
+
+void BM_InlinedVectorIndexExternal(benchmark::State& state) {
+ absl::InlinedVector<int, 8> v = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
+ for (auto _ : state) {
+ benchmark::DoNotOptimize(v);
+ benchmark::DoNotOptimize(v[4]);
+ }
+}
+BENCHMARK(BM_InlinedVectorIndexExternal);
+
+void BM_StdVectorIndex(benchmark::State& state) {
+ std::vector<int> v = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
+ for (auto _ : state) {
+ benchmark::DoNotOptimize(v);
+ benchmark::DoNotOptimize(v[4]);
+ }
+}
+BENCHMARK(BM_StdVectorIndex);
+
+void BM_InlinedVectorDataInlined(benchmark::State& state) {
+ absl::InlinedVector<int, 8> v = {1, 2, 3, 4, 5, 6, 7};
+ for (auto _ : state) {
+ benchmark::DoNotOptimize(v);
+ benchmark::DoNotOptimize(v.data());
+ }
+}
+BENCHMARK(BM_InlinedVectorDataInlined);
+
+void BM_InlinedVectorDataExternal(benchmark::State& state) {
+ absl::InlinedVector<int, 8> v = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
+ for (auto _ : state) {
+ benchmark::DoNotOptimize(v);
+ benchmark::DoNotOptimize(v.data());
+ }
+ state.SetItemsProcessed(16 * static_cast<int64_t>(state.iterations()));
+}
+BENCHMARK(BM_InlinedVectorDataExternal);
+
+void BM_StdVectorData(benchmark::State& state) {
+ std::vector<int> v = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
+ for (auto _ : state) {
+ benchmark::DoNotOptimize(v);
+ benchmark::DoNotOptimize(v.data());
+ }
+ state.SetItemsProcessed(16 * static_cast<int64_t>(state.iterations()));
+}
+BENCHMARK(BM_StdVectorData);
+
+void BM_InlinedVectorSizeInlined(benchmark::State& state) {
+ absl::InlinedVector<int, 8> v = {1, 2, 3, 4, 5, 6, 7};
+ for (auto _ : state) {
+ benchmark::DoNotOptimize(v);
+ benchmark::DoNotOptimize(v.size());
+ }
+}
+BENCHMARK(BM_InlinedVectorSizeInlined);
+
+void BM_InlinedVectorSizeExternal(benchmark::State& state) {
+ absl::InlinedVector<int, 8> v = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
+ for (auto _ : state) {
+ benchmark::DoNotOptimize(v);
+ benchmark::DoNotOptimize(v.size());
+ }
+}
+BENCHMARK(BM_InlinedVectorSizeExternal);
+
+void BM_StdVectorSize(benchmark::State& state) {
+ std::vector<int> v = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
+ for (auto _ : state) {
+ benchmark::DoNotOptimize(v);
+ benchmark::DoNotOptimize(v.size());
+ }
+}
+BENCHMARK(BM_StdVectorSize);
+
+void BM_InlinedVectorEmptyInlined(benchmark::State& state) {
+ absl::InlinedVector<int, 8> v = {1, 2, 3, 4, 5, 6, 7};
+ for (auto _ : state) {
+ benchmark::DoNotOptimize(v);
+ benchmark::DoNotOptimize(v.empty());
+ }
+}
+BENCHMARK(BM_InlinedVectorEmptyInlined);
+
+void BM_InlinedVectorEmptyExternal(benchmark::State& state) {
+ absl::InlinedVector<int, 8> v = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
+ for (auto _ : state) {
+ benchmark::DoNotOptimize(v);
+ benchmark::DoNotOptimize(v.empty());
+ }
+}
+BENCHMARK(BM_InlinedVectorEmptyExternal);
+
+void BM_StdVectorEmpty(benchmark::State& state) {
+ std::vector<int> v = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
+ for (auto _ : state) {
+ benchmark::DoNotOptimize(v);
+ benchmark::DoNotOptimize(v.empty());
+ }
+}
+BENCHMARK(BM_StdVectorEmpty);
+
+constexpr size_t kInlinedCapacity = 4;
+constexpr size_t kLargeSize = kInlinedCapacity * 2;
+constexpr size_t kSmallSize = kInlinedCapacity / 2;
+constexpr size_t kBatchSize = 100;
+
+#define ABSL_INTERNAL_BENCHMARK_ONE_SIZE(BM_FunctionTemplate, T) \
+ BENCHMARK_TEMPLATE(BM_FunctionTemplate, T, kLargeSize); \
+ BENCHMARK_TEMPLATE(BM_FunctionTemplate, T, kSmallSize)
+
+#define ABSL_INTERNAL_BENCHMARK_TWO_SIZE(BM_FunctionTemplate, T) \
+ BENCHMARK_TEMPLATE(BM_FunctionTemplate, T, kLargeSize, kLargeSize); \
+ BENCHMARK_TEMPLATE(BM_FunctionTemplate, T, kLargeSize, kSmallSize); \
+ BENCHMARK_TEMPLATE(BM_FunctionTemplate, T, kSmallSize, kLargeSize); \
+ BENCHMARK_TEMPLATE(BM_FunctionTemplate, T, kSmallSize, kSmallSize)
+
+template <typename T>
+using InlVec = absl::InlinedVector<T, kInlinedCapacity>;
+
+struct TrivialType {
+ size_t val;
+};
+
+class NontrivialType {
+ public:
+ ABSL_ATTRIBUTE_NOINLINE NontrivialType() : val_() {
+ benchmark::DoNotOptimize(*this);
+ }
+
+ ABSL_ATTRIBUTE_NOINLINE NontrivialType(const NontrivialType& other)
+ : val_(other.val_) {
+ benchmark::DoNotOptimize(*this);
+ }
+
+ ABSL_ATTRIBUTE_NOINLINE NontrivialType& operator=(
+ const NontrivialType& other) {
+ val_ = other.val_;
+ benchmark::DoNotOptimize(*this);
+ return *this;
+ }
+
+ ABSL_ATTRIBUTE_NOINLINE ~NontrivialType() noexcept {
+ benchmark::DoNotOptimize(*this);
+ }
+
+ private:
+ size_t val_;
+};
+
+template <typename T, typename PrepareVecFn, typename TestVecFn>
+void BatchedBenchmark(benchmark::State& state, PrepareVecFn prepare_vec,
+ TestVecFn test_vec) {
+ std::array<InlVec<T>, kBatchSize> vector_batch{};
+
+ while (state.KeepRunningBatch(kBatchSize)) {
+ // Prepare batch
+ state.PauseTiming();
+ for (size_t i = 0; i < kBatchSize; ++i) {
+ prepare_vec(vector_batch.data() + i, i);
+ }
+ benchmark::DoNotOptimize(vector_batch);
+ state.ResumeTiming();
+
+ // Test batch
+ for (size_t i = 0; i < kBatchSize; ++i) {
+ test_vec(vector_batch.data() + i, i);
+ }
+ }
+}
+
+template <typename T, size_t ToSize>
+void BM_ConstructFromSize(benchmark::State& state) {
+ using VecT = InlVec<T>;
+ auto size = ToSize;
+ BatchedBenchmark<T>(
+ state,
+ /* prepare_vec = */ [](InlVec<T>* vec, size_t) { vec->~VecT(); },
+ /* test_vec = */
+ [&](void* ptr, size_t) {
+ benchmark::DoNotOptimize(size);
+ ::new (ptr) VecT(size);
+ });
+}
+ABSL_INTERNAL_BENCHMARK_ONE_SIZE(BM_ConstructFromSize, TrivialType);
+ABSL_INTERNAL_BENCHMARK_ONE_SIZE(BM_ConstructFromSize, NontrivialType);
+
+template <typename T, size_t ToSize>
+void BM_ConstructFromSizeRef(benchmark::State& state) {
+ using VecT = InlVec<T>;
+ auto size = ToSize;
+ auto ref = T();
+ BatchedBenchmark<T>(
+ state,
+ /* prepare_vec = */ [](InlVec<T>* vec, size_t) { vec->~VecT(); },
+ /* test_vec = */
+ [&](void* ptr, size_t) {
+ benchmark::DoNotOptimize(size);
+ benchmark::DoNotOptimize(ref);
+ ::new (ptr) VecT(size, ref);
+ });
+}
+ABSL_INTERNAL_BENCHMARK_ONE_SIZE(BM_ConstructFromSizeRef, TrivialType);
+ABSL_INTERNAL_BENCHMARK_ONE_SIZE(BM_ConstructFromSizeRef, NontrivialType);
+
+template <typename T, size_t ToSize>
+void BM_ConstructFromRange(benchmark::State& state) {
+ using VecT = InlVec<T>;
+ std::array<T, ToSize> arr{};
+ BatchedBenchmark<T>(
+ state,
+ /* prepare_vec = */ [](InlVec<T>* vec, size_t) { vec->~VecT(); },
+ /* test_vec = */
+ [&](void* ptr, size_t) {
+ benchmark::DoNotOptimize(arr);
+ ::new (ptr) VecT(arr.begin(), arr.end());
+ });
+}
+ABSL_INTERNAL_BENCHMARK_ONE_SIZE(BM_ConstructFromRange, TrivialType);
+ABSL_INTERNAL_BENCHMARK_ONE_SIZE(BM_ConstructFromRange, NontrivialType);
+
+template <typename T, size_t ToSize>
+void BM_ConstructFromCopy(benchmark::State& state) {
+ using VecT = InlVec<T>;
+ VecT other_vec(ToSize);
+ BatchedBenchmark<T>(
+ state,
+ /* prepare_vec = */
+ [](InlVec<T>* vec, size_t) { vec->~VecT(); },
+ /* test_vec = */
+ [&](void* ptr, size_t) {
+ benchmark::DoNotOptimize(other_vec);
+ ::new (ptr) VecT(other_vec);
+ });
+}
+ABSL_INTERNAL_BENCHMARK_ONE_SIZE(BM_ConstructFromCopy, TrivialType);
+ABSL_INTERNAL_BENCHMARK_ONE_SIZE(BM_ConstructFromCopy, NontrivialType);
+
+template <typename T, size_t ToSize>
+void BM_ConstructFromMove(benchmark::State& state) {
+ using VecT = InlVec<T>;
+ std::array<VecT, kBatchSize> vector_batch{};
+ BatchedBenchmark<T>(
+ state,
+ /* prepare_vec = */
+ [&](InlVec<T>* vec, size_t i) {
+ vector_batch[i].clear();
+ vector_batch[i].resize(ToSize);
+ vec->~VecT();
+ },
+ /* test_vec = */
+ [&](void* ptr, size_t i) {
+ benchmark::DoNotOptimize(vector_batch[i]);
+ ::new (ptr) VecT(std::move(vector_batch[i]));
+ });
+}
+ABSL_INTERNAL_BENCHMARK_ONE_SIZE(BM_ConstructFromMove, TrivialType);
+ABSL_INTERNAL_BENCHMARK_ONE_SIZE(BM_ConstructFromMove, NontrivialType);
+
+template <typename T, size_t FromSize, size_t ToSize>
+void BM_AssignSizeRef(benchmark::State& state) {
+ auto size = ToSize;
+ auto ref = T();
+ BatchedBenchmark<T>(
+ state,
+ /* prepare_vec = */ [](InlVec<T>* vec, size_t) { vec->resize(FromSize); },
+ /* test_vec = */
+ [&](InlVec<T>* vec, size_t) {
+ benchmark::DoNotOptimize(size);
+ benchmark::DoNotOptimize(ref);
+ vec->assign(size, ref);
+ });
+}
+ABSL_INTERNAL_BENCHMARK_TWO_SIZE(BM_AssignSizeRef, TrivialType);
+ABSL_INTERNAL_BENCHMARK_TWO_SIZE(BM_AssignSizeRef, NontrivialType);
+
+template <typename T, size_t FromSize, size_t ToSize>
+void BM_AssignRange(benchmark::State& state) {
+ std::array<T, ToSize> arr{};
+ BatchedBenchmark<T>(
+ state,
+ /* prepare_vec = */ [](InlVec<T>* vec, size_t) { vec->resize(FromSize); },
+ /* test_vec = */
+ [&](InlVec<T>* vec, size_t) {
+ benchmark::DoNotOptimize(arr);
+ vec->assign(arr.begin(), arr.end());
+ });
+}
+ABSL_INTERNAL_BENCHMARK_TWO_SIZE(BM_AssignRange, TrivialType);
+ABSL_INTERNAL_BENCHMARK_TWO_SIZE(BM_AssignRange, NontrivialType);
+
+template <typename T, size_t FromSize, size_t ToSize>
+void BM_AssignFromCopy(benchmark::State& state) {
+ InlVec<T> other_vec(ToSize);
+ BatchedBenchmark<T>(
+ state,
+ /* prepare_vec = */ [](InlVec<T>* vec, size_t) { vec->resize(FromSize); },
+ /* test_vec = */
+ [&](InlVec<T>* vec, size_t) {
+ benchmark::DoNotOptimize(other_vec);
+ *vec = other_vec;
+ });
+}
+ABSL_INTERNAL_BENCHMARK_TWO_SIZE(BM_AssignFromCopy, TrivialType);
+ABSL_INTERNAL_BENCHMARK_TWO_SIZE(BM_AssignFromCopy, NontrivialType);
+
+template <typename T, size_t FromSize, size_t ToSize>
+void BM_AssignFromMove(benchmark::State& state) {
+ using VecT = InlVec<T>;
+ std::array<VecT, kBatchSize> vector_batch{};
+ BatchedBenchmark<T>(
+ state,
+ /* prepare_vec = */
+ [&](InlVec<T>* vec, size_t i) {
+ vector_batch[i].clear();
+ vector_batch[i].resize(ToSize);
+ vec->resize(FromSize);
+ },
+ /* test_vec = */
+ [&](InlVec<T>* vec, size_t i) {
+ benchmark::DoNotOptimize(vector_batch[i]);
+ *vec = std::move(vector_batch[i]);
+ });
+}
+ABSL_INTERNAL_BENCHMARK_TWO_SIZE(BM_AssignFromMove, TrivialType);
+ABSL_INTERNAL_BENCHMARK_TWO_SIZE(BM_AssignFromMove, NontrivialType);
+
+template <typename T, size_t FromSize, size_t ToSize>
+void BM_ResizeSize(benchmark::State& state) {
+ BatchedBenchmark<T>(
+ state,
+ /* prepare_vec = */
+ [](InlVec<T>* vec, size_t) {
+ vec->clear();
+ vec->resize(FromSize);
+ },
+ /* test_vec = */
+ [](InlVec<T>* vec, size_t) { vec->resize(ToSize); });
+}
+ABSL_INTERNAL_BENCHMARK_TWO_SIZE(BM_ResizeSize, TrivialType);
+ABSL_INTERNAL_BENCHMARK_TWO_SIZE(BM_ResizeSize, NontrivialType);
+
+template <typename T, size_t FromSize, size_t ToSize>
+void BM_ResizeSizeRef(benchmark::State& state) {
+ auto t = T();
+ BatchedBenchmark<T>(
+ state,
+ /* prepare_vec = */
+ [](InlVec<T>* vec, size_t) {
+ vec->clear();
+ vec->resize(FromSize);
+ },
+ /* test_vec = */
+ [&](InlVec<T>* vec, size_t) {
+ benchmark::DoNotOptimize(t);
+ vec->resize(ToSize, t);
+ });
+}
+ABSL_INTERNAL_BENCHMARK_TWO_SIZE(BM_ResizeSizeRef, TrivialType);
+ABSL_INTERNAL_BENCHMARK_TWO_SIZE(BM_ResizeSizeRef, NontrivialType);
+
+template <typename T, size_t FromSize, size_t ToSize>
+void BM_InsertSizeRef(benchmark::State& state) {
+ auto t = T();
+ BatchedBenchmark<T>(
+ state,
+ /* prepare_vec = */
+ [](InlVec<T>* vec, size_t) {
+ vec->clear();
+ vec->resize(FromSize);
+ },
+ /* test_vec = */
+ [&](InlVec<T>* vec, size_t) {
+ benchmark::DoNotOptimize(t);
+ auto* pos = vec->data() + (vec->size() / 2);
+ vec->insert(pos, t);
+ });
+}
+ABSL_INTERNAL_BENCHMARK_TWO_SIZE(BM_InsertSizeRef, TrivialType);
+ABSL_INTERNAL_BENCHMARK_TWO_SIZE(BM_InsertSizeRef, NontrivialType);
+
+template <typename T, size_t FromSize, size_t ToSize>
+void BM_InsertRange(benchmark::State& state) {
+ InlVec<T> other_vec(ToSize);
+ BatchedBenchmark<T>(
+ state,
+ /* prepare_vec = */
+ [](InlVec<T>* vec, size_t) {
+ vec->clear();
+ vec->resize(FromSize);
+ },
+ /* test_vec = */
+ [&](InlVec<T>* vec, size_t) {
+ benchmark::DoNotOptimize(other_vec);
+ auto* pos = vec->data() + (vec->size() / 2);
+ vec->insert(pos, other_vec.begin(), other_vec.end());
+ });
+}
+ABSL_INTERNAL_BENCHMARK_TWO_SIZE(BM_InsertRange, TrivialType);
+ABSL_INTERNAL_BENCHMARK_TWO_SIZE(BM_InsertRange, NontrivialType);
+
+template <typename T, size_t FromSize>
+void BM_EmplaceBack(benchmark::State& state) {
+ BatchedBenchmark<T>(
+ state,
+ /* prepare_vec = */
+ [](InlVec<T>* vec, size_t) {
+ vec->clear();
+ vec->resize(FromSize);
+ },
+ /* test_vec = */
+ [](InlVec<T>* vec, size_t) { vec->emplace_back(); });
+}
+ABSL_INTERNAL_BENCHMARK_ONE_SIZE(BM_EmplaceBack, TrivialType);
+ABSL_INTERNAL_BENCHMARK_ONE_SIZE(BM_EmplaceBack, NontrivialType);
+
+template <typename T, size_t FromSize>
+void BM_PopBack(benchmark::State& state) {
+ BatchedBenchmark<T>(
+ state,
+ /* prepare_vec = */
+ [](InlVec<T>* vec, size_t) {
+ vec->clear();
+ vec->resize(FromSize);
+ },
+ /* test_vec = */
+ [](InlVec<T>* vec, size_t) { vec->pop_back(); });
+}
+ABSL_INTERNAL_BENCHMARK_ONE_SIZE(BM_PopBack, TrivialType);
+ABSL_INTERNAL_BENCHMARK_ONE_SIZE(BM_PopBack, NontrivialType);
+
+template <typename T, size_t FromSize>
+void BM_EraseOne(benchmark::State& state) {
+ BatchedBenchmark<T>(
+ state,
+ /* prepare_vec = */
+ [](InlVec<T>* vec, size_t) {
+ vec->clear();
+ vec->resize(FromSize);
+ },
+ /* test_vec = */
+ [](InlVec<T>* vec, size_t) {
+ auto* pos = vec->data() + (vec->size() / 2);
+ vec->erase(pos);
+ });
+}
+ABSL_INTERNAL_BENCHMARK_ONE_SIZE(BM_EraseOne, TrivialType);
+ABSL_INTERNAL_BENCHMARK_ONE_SIZE(BM_EraseOne, NontrivialType);
+
+template <typename T, size_t FromSize>
+void BM_EraseRange(benchmark::State& state) {
+ BatchedBenchmark<T>(
+ state,
+ /* prepare_vec = */
+ [](InlVec<T>* vec, size_t) {
+ vec->clear();
+ vec->resize(FromSize);
+ },
+ /* test_vec = */
+ [](InlVec<T>* vec, size_t) {
+ auto* pos = vec->data() + (vec->size() / 2);
+ vec->erase(pos, pos + 1);
+ });
+}
+ABSL_INTERNAL_BENCHMARK_ONE_SIZE(BM_EraseRange, TrivialType);
+ABSL_INTERNAL_BENCHMARK_ONE_SIZE(BM_EraseRange, NontrivialType);
+
+template <typename T, size_t FromSize>
+void BM_Clear(benchmark::State& state) {
+ BatchedBenchmark<T>(
+ state,
+ /* prepare_vec = */ [](InlVec<T>* vec, size_t) { vec->resize(FromSize); },
+ /* test_vec = */ [](InlVec<T>* vec, size_t) { vec->clear(); });
+}
+ABSL_INTERNAL_BENCHMARK_ONE_SIZE(BM_Clear, TrivialType);
+ABSL_INTERNAL_BENCHMARK_ONE_SIZE(BM_Clear, NontrivialType);
+
+template <typename T, size_t FromSize, size_t ToCapacity>
+void BM_Reserve(benchmark::State& state) {
+ BatchedBenchmark<T>(
+ state,
+ /* prepare_vec = */
+ [](InlVec<T>* vec, size_t) {
+ vec->clear();
+ vec->resize(FromSize);
+ },
+ /* test_vec = */
+ [](InlVec<T>* vec, size_t) { vec->reserve(ToCapacity); });
+}
+ABSL_INTERNAL_BENCHMARK_TWO_SIZE(BM_Reserve, TrivialType);
+ABSL_INTERNAL_BENCHMARK_TWO_SIZE(BM_Reserve, NontrivialType);
+
+template <typename T, size_t FromCapacity, size_t ToCapacity>
+void BM_ShrinkToFit(benchmark::State& state) {
+ BatchedBenchmark<T>(
+ state,
+ /* prepare_vec = */
+ [](InlVec<T>* vec, size_t) {
+ vec->clear();
+ vec->resize(ToCapacity);
+ vec->reserve(FromCapacity);
+ },
+ /* test_vec = */ [](InlVec<T>* vec, size_t) { vec->shrink_to_fit(); });
+}
+ABSL_INTERNAL_BENCHMARK_TWO_SIZE(BM_ShrinkToFit, TrivialType);
+ABSL_INTERNAL_BENCHMARK_TWO_SIZE(BM_ShrinkToFit, NontrivialType);
+
+template <typename T, size_t FromSize, size_t ToSize>
+void BM_Swap(benchmark::State& state) {
+ using VecT = InlVec<T>;
+ std::array<VecT, kBatchSize> vector_batch{};
+ BatchedBenchmark<T>(
+ state,
+ /* prepare_vec = */
+ [&](InlVec<T>* vec, size_t i) {
+ vector_batch[i].clear();
+ vector_batch[i].resize(ToSize);
+ vec->resize(FromSize);
+ },
+ /* test_vec = */
+ [&](InlVec<T>* vec, size_t i) {
+ using std::swap;
+ benchmark::DoNotOptimize(vector_batch[i]);
+ swap(*vec, vector_batch[i]);
+ });
+}
+ABSL_INTERNAL_BENCHMARK_TWO_SIZE(BM_Swap, TrivialType);
+ABSL_INTERNAL_BENCHMARK_TWO_SIZE(BM_Swap, NontrivialType);
+
+} // namespace
diff --git a/third_party/abseil/src/absl/container/inlined_vector_exception_safety_test.cc b/third_party/abseil/src/absl/container/inlined_vector_exception_safety_test.cc
new file mode 100644
index 0000000..0e6a05b
--- /dev/null
+++ b/third_party/abseil/src/absl/container/inlined_vector_exception_safety_test.cc
@@ -0,0 +1,508 @@
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/container/inlined_vector.h"
+
+#include "absl/base/config.h"
+
+#if defined(ABSL_HAVE_EXCEPTIONS)
+
+#include <array>
+#include <initializer_list>
+#include <iterator>
+#include <memory>
+#include <utility>
+
+#include "gtest/gtest.h"
+#include "absl/base/internal/exception_safety_testing.h"
+
+namespace {
+
+constexpr size_t kInlinedCapacity = 4;
+constexpr size_t kLargeSize = kInlinedCapacity * 2;
+constexpr size_t kSmallSize = kInlinedCapacity / 2;
+
+using Thrower = testing::ThrowingValue<>;
+using MovableThrower = testing::ThrowingValue<testing::TypeSpec::kNoThrowMove>;
+using ThrowAlloc = testing::ThrowingAllocator<Thrower>;
+
+using ThrowerVec = absl::InlinedVector<Thrower, kInlinedCapacity>;
+using MovableThrowerVec = absl::InlinedVector<MovableThrower, kInlinedCapacity>;
+
+using ThrowAllocThrowerVec =
+ absl::InlinedVector<Thrower, kInlinedCapacity, ThrowAlloc>;
+using ThrowAllocMovableThrowerVec =
+ absl::InlinedVector<MovableThrower, kInlinedCapacity, ThrowAlloc>;
+
+// In GCC, if an element of a `std::initializer_list` throws during construction
+// the elements that were constructed before it are not destroyed. This causes
+// incorrect exception safety test failures. Thus, `testing::nothrow_ctor` is
+// required. See: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66139
+#define ABSL_INTERNAL_MAKE_INIT_LIST(T, N) \
+ (N > kInlinedCapacity \
+ ? std::initializer_list<T>{T(0, testing::nothrow_ctor), \
+ T(1, testing::nothrow_ctor), \
+ T(2, testing::nothrow_ctor), \
+ T(3, testing::nothrow_ctor), \
+ T(4, testing::nothrow_ctor), \
+ T(5, testing::nothrow_ctor), \
+ T(6, testing::nothrow_ctor), \
+ T(7, testing::nothrow_ctor)} \
+ \
+ : std::initializer_list<T>{T(0, testing::nothrow_ctor), \
+ T(1, testing::nothrow_ctor)})
+static_assert(kLargeSize == 8, "Must update ABSL_INTERNAL_MAKE_INIT_LIST(...)");
+static_assert(kSmallSize == 2, "Must update ABSL_INTERNAL_MAKE_INIT_LIST(...)");
+
+template <typename TheVecT, size_t... TheSizes>
+class TestParams {
+ public:
+ using VecT = TheVecT;
+ constexpr static size_t GetSizeAt(size_t i) { return kSizes[1 + i]; }
+
+ private:
+ constexpr static size_t kSizes[1 + sizeof...(TheSizes)] = {1, TheSizes...};
+};
+
+using NoSizeTestParams =
+ ::testing::Types<TestParams<ThrowerVec>, TestParams<MovableThrowerVec>,
+ TestParams<ThrowAllocThrowerVec>,
+ TestParams<ThrowAllocMovableThrowerVec>>;
+
+using OneSizeTestParams =
+ ::testing::Types<TestParams<ThrowerVec, kLargeSize>,
+ TestParams<ThrowerVec, kSmallSize>,
+ TestParams<MovableThrowerVec, kLargeSize>,
+ TestParams<MovableThrowerVec, kSmallSize>,
+ TestParams<ThrowAllocThrowerVec, kLargeSize>,
+ TestParams<ThrowAllocThrowerVec, kSmallSize>,
+ TestParams<ThrowAllocMovableThrowerVec, kLargeSize>,
+ TestParams<ThrowAllocMovableThrowerVec, kSmallSize>>;
+
+using TwoSizeTestParams = ::testing::Types<
+ TestParams<ThrowerVec, kLargeSize, kLargeSize>,
+ TestParams<ThrowerVec, kLargeSize, kSmallSize>,
+ TestParams<ThrowerVec, kSmallSize, kLargeSize>,
+ TestParams<ThrowerVec, kSmallSize, kSmallSize>,
+ TestParams<MovableThrowerVec, kLargeSize, kLargeSize>,
+ TestParams<MovableThrowerVec, kLargeSize, kSmallSize>,
+ TestParams<MovableThrowerVec, kSmallSize, kLargeSize>,
+ TestParams<MovableThrowerVec, kSmallSize, kSmallSize>,
+ TestParams<ThrowAllocThrowerVec, kLargeSize, kLargeSize>,
+ TestParams<ThrowAllocThrowerVec, kLargeSize, kSmallSize>,
+ TestParams<ThrowAllocThrowerVec, kSmallSize, kLargeSize>,
+ TestParams<ThrowAllocThrowerVec, kSmallSize, kSmallSize>,
+ TestParams<ThrowAllocMovableThrowerVec, kLargeSize, kLargeSize>,
+ TestParams<ThrowAllocMovableThrowerVec, kLargeSize, kSmallSize>,
+ TestParams<ThrowAllocMovableThrowerVec, kSmallSize, kLargeSize>,
+ TestParams<ThrowAllocMovableThrowerVec, kSmallSize, kSmallSize>>;
+
+template <typename>
+struct NoSizeTest : ::testing::Test {};
+TYPED_TEST_SUITE(NoSizeTest, NoSizeTestParams);
+
+template <typename>
+struct OneSizeTest : ::testing::Test {};
+TYPED_TEST_SUITE(OneSizeTest, OneSizeTestParams);
+
+template <typename>
+struct TwoSizeTest : ::testing::Test {};
+TYPED_TEST_SUITE(TwoSizeTest, TwoSizeTestParams);
+
+template <typename VecT>
+bool InlinedVectorInvariants(VecT* vec) {
+ if (*vec != *vec) return false;
+ if (vec->size() > vec->capacity()) return false;
+ if (vec->size() > vec->max_size()) return false;
+ if (vec->capacity() > vec->max_size()) return false;
+ if (vec->data() != std::addressof(vec->at(0))) return false;
+ if (vec->data() != vec->begin()) return false;
+ if (*vec->data() != *vec->begin()) return false;
+ if (vec->begin() > vec->end()) return false;
+ if ((vec->end() - vec->begin()) != vec->size()) return false;
+ if (std::distance(vec->begin(), vec->end()) != vec->size()) return false;
+ return true;
+}
+
+// Function that always returns false is correct, but refactoring is required
+// for clarity. It's needed to express that, as a contract, certain operations
+// should not throw at all. Execution of this function means an exception was
+// thrown and thus the test should fail.
+// TODO(johnsoncj): Add `testing::NoThrowGuarantee` to the framework
+template <typename VecT>
+bool NoThrowGuarantee(VecT* /* vec */) {
+ return false;
+}
+
+TYPED_TEST(NoSizeTest, DefaultConstructor) {
+ using VecT = typename TypeParam::VecT;
+ using allocator_type = typename VecT::allocator_type;
+
+ testing::TestThrowingCtor<VecT>();
+
+ testing::TestThrowingCtor<VecT>(allocator_type{});
+}
+
+TYPED_TEST(OneSizeTest, SizeConstructor) {
+ using VecT = typename TypeParam::VecT;
+ using allocator_type = typename VecT::allocator_type;
+ constexpr static auto size = TypeParam::GetSizeAt(0);
+
+ testing::TestThrowingCtor<VecT>(size);
+
+ testing::TestThrowingCtor<VecT>(size, allocator_type{});
+}
+
+TYPED_TEST(OneSizeTest, SizeRefConstructor) {
+ using VecT = typename TypeParam::VecT;
+ using value_type = typename VecT::value_type;
+ using allocator_type = typename VecT::allocator_type;
+ constexpr static auto size = TypeParam::GetSizeAt(0);
+
+ testing::TestThrowingCtor<VecT>(size, value_type{});
+
+ testing::TestThrowingCtor<VecT>(size, value_type{}, allocator_type{});
+}
+
+TYPED_TEST(OneSizeTest, InitializerListConstructor) {
+ using VecT = typename TypeParam::VecT;
+ using value_type = typename VecT::value_type;
+ using allocator_type = typename VecT::allocator_type;
+ constexpr static auto size = TypeParam::GetSizeAt(0);
+
+ testing::TestThrowingCtor<VecT>(
+ ABSL_INTERNAL_MAKE_INIT_LIST(value_type, size));
+
+ testing::TestThrowingCtor<VecT>(
+ ABSL_INTERNAL_MAKE_INIT_LIST(value_type, size), allocator_type{});
+}
+
+TYPED_TEST(OneSizeTest, RangeConstructor) {
+ using VecT = typename TypeParam::VecT;
+ using value_type = typename VecT::value_type;
+ using allocator_type = typename VecT::allocator_type;
+ constexpr static auto size = TypeParam::GetSizeAt(0);
+
+ std::array<value_type, size> arr{};
+
+ testing::TestThrowingCtor<VecT>(arr.begin(), arr.end());
+
+ testing::TestThrowingCtor<VecT>(arr.begin(), arr.end(), allocator_type{});
+}
+
+TYPED_TEST(OneSizeTest, CopyConstructor) {
+ using VecT = typename TypeParam::VecT;
+ using allocator_type = typename VecT::allocator_type;
+ constexpr static auto size = TypeParam::GetSizeAt(0);
+
+ VecT other_vec{size};
+
+ testing::TestThrowingCtor<VecT>(other_vec);
+
+ testing::TestThrowingCtor<VecT>(other_vec, allocator_type{});
+}
+
+TYPED_TEST(OneSizeTest, MoveConstructor) {
+ using VecT = typename TypeParam::VecT;
+ using allocator_type = typename VecT::allocator_type;
+ constexpr static auto size = TypeParam::GetSizeAt(0);
+
+ if (!absl::allocator_is_nothrow<allocator_type>::value) {
+ testing::TestThrowingCtor<VecT>(VecT{size});
+
+ testing::TestThrowingCtor<VecT>(VecT{size}, allocator_type{});
+ }
+}
+
+TYPED_TEST(TwoSizeTest, Assign) {
+ using VecT = typename TypeParam::VecT;
+ using value_type = typename VecT::value_type;
+ constexpr static auto from_size = TypeParam::GetSizeAt(0);
+ constexpr static auto to_size = TypeParam::GetSizeAt(1);
+
+ auto tester = testing::MakeExceptionSafetyTester()
+ .WithInitialValue(VecT{from_size})
+ .WithContracts(InlinedVectorInvariants<VecT>);
+
+ EXPECT_TRUE(tester.Test([](VecT* vec) {
+ *vec = ABSL_INTERNAL_MAKE_INIT_LIST(value_type, to_size);
+ }));
+
+ EXPECT_TRUE(tester.Test([](VecT* vec) {
+ VecT other_vec{to_size};
+ *vec = other_vec;
+ }));
+
+ EXPECT_TRUE(tester.Test([](VecT* vec) {
+ VecT other_vec{to_size};
+ *vec = std::move(other_vec);
+ }));
+
+ EXPECT_TRUE(tester.Test([](VecT* vec) {
+ value_type val{};
+ vec->assign(to_size, val);
+ }));
+
+ EXPECT_TRUE(tester.Test([](VecT* vec) {
+ vec->assign(ABSL_INTERNAL_MAKE_INIT_LIST(value_type, to_size));
+ }));
+
+ EXPECT_TRUE(tester.Test([](VecT* vec) {
+ std::array<value_type, to_size> arr{};
+ vec->assign(arr.begin(), arr.end());
+ }));
+}
+
+TYPED_TEST(TwoSizeTest, Resize) {
+ using VecT = typename TypeParam::VecT;
+ using value_type = typename VecT::value_type;
+ constexpr static auto from_size = TypeParam::GetSizeAt(0);
+ constexpr static auto to_size = TypeParam::GetSizeAt(1);
+
+ auto tester = testing::MakeExceptionSafetyTester()
+ .WithInitialValue(VecT{from_size})
+ .WithContracts(InlinedVectorInvariants<VecT>,
+ testing::strong_guarantee);
+
+ EXPECT_TRUE(tester.Test([](VecT* vec) {
+ vec->resize(to_size); //
+ }));
+
+ EXPECT_TRUE(tester.Test([](VecT* vec) {
+ vec->resize(to_size, value_type{}); //
+ }));
+}
+
+TYPED_TEST(OneSizeTest, Insert) {
+ using VecT = typename TypeParam::VecT;
+ using value_type = typename VecT::value_type;
+ constexpr static auto from_size = TypeParam::GetSizeAt(0);
+
+ auto tester = testing::MakeExceptionSafetyTester()
+ .WithInitialValue(VecT{from_size})
+ .WithContracts(InlinedVectorInvariants<VecT>);
+
+ EXPECT_TRUE(tester.Test([](VecT* vec) {
+ auto it = vec->begin();
+ vec->insert(it, value_type{});
+ }));
+ EXPECT_TRUE(tester.Test([](VecT* vec) {
+ auto it = vec->begin() + (vec->size() / 2);
+ vec->insert(it, value_type{});
+ }));
+ EXPECT_TRUE(tester.Test([](VecT* vec) {
+ auto it = vec->end();
+ vec->insert(it, value_type{});
+ }));
+}
+
+TYPED_TEST(TwoSizeTest, Insert) {
+ using VecT = typename TypeParam::VecT;
+ using value_type = typename VecT::value_type;
+ constexpr static auto from_size = TypeParam::GetSizeAt(0);
+ constexpr static auto count = TypeParam::GetSizeAt(1);
+
+ auto tester = testing::MakeExceptionSafetyTester()
+ .WithInitialValue(VecT{from_size})
+ .WithContracts(InlinedVectorInvariants<VecT>);
+
+ EXPECT_TRUE(tester.Test([](VecT* vec) {
+ auto it = vec->begin();
+ vec->insert(it, count, value_type{});
+ }));
+ EXPECT_TRUE(tester.Test([](VecT* vec) {
+ auto it = vec->begin() + (vec->size() / 2);
+ vec->insert(it, count, value_type{});
+ }));
+ EXPECT_TRUE(tester.Test([](VecT* vec) {
+ auto it = vec->end();
+ vec->insert(it, count, value_type{});
+ }));
+
+ EXPECT_TRUE(tester.Test([](VecT* vec) {
+ auto it = vec->begin();
+ vec->insert(it, ABSL_INTERNAL_MAKE_INIT_LIST(value_type, count));
+ }));
+ EXPECT_TRUE(tester.Test([](VecT* vec) {
+ auto it = vec->begin() + (vec->size() / 2);
+ vec->insert(it, ABSL_INTERNAL_MAKE_INIT_LIST(value_type, count));
+ }));
+ EXPECT_TRUE(tester.Test([](VecT* vec) {
+ auto it = vec->end();
+ vec->insert(it, ABSL_INTERNAL_MAKE_INIT_LIST(value_type, count));
+ }));
+
+ EXPECT_TRUE(tester.Test([](VecT* vec) {
+ auto it = vec->begin();
+ std::array<value_type, count> arr{};
+ vec->insert(it, arr.begin(), arr.end());
+ }));
+ EXPECT_TRUE(tester.Test([](VecT* vec) {
+ auto it = vec->begin() + (vec->size() / 2);
+ std::array<value_type, count> arr{};
+ vec->insert(it, arr.begin(), arr.end());
+ }));
+ EXPECT_TRUE(tester.Test([](VecT* vec) {
+ auto it = vec->end();
+ std::array<value_type, count> arr{};
+ vec->insert(it, arr.begin(), arr.end());
+ }));
+}
+
+TYPED_TEST(OneSizeTest, EmplaceBack) {
+ using VecT = typename TypeParam::VecT;
+ constexpr static auto size = TypeParam::GetSizeAt(0);
+
+ // For testing calls to `emplace_back(...)` that reallocate.
+ VecT full_vec{size};
+ full_vec.resize(full_vec.capacity());
+
+ // For testing calls to `emplace_back(...)` that don't reallocate.
+ VecT nonfull_vec{size};
+ nonfull_vec.reserve(size + 1);
+
+ auto tester = testing::MakeExceptionSafetyTester().WithContracts(
+ InlinedVectorInvariants<VecT>);
+
+ EXPECT_TRUE(tester.WithInitialValue(nonfull_vec).Test([](VecT* vec) {
+ vec->emplace_back();
+ }));
+
+ EXPECT_TRUE(tester.WithInitialValue(full_vec).Test(
+ [](VecT* vec) { vec->emplace_back(); }));
+}
+
+TYPED_TEST(OneSizeTest, PopBack) {
+ using VecT = typename TypeParam::VecT;
+ constexpr static auto size = TypeParam::GetSizeAt(0);
+
+ auto tester = testing::MakeExceptionSafetyTester()
+ .WithInitialValue(VecT{size})
+ .WithContracts(NoThrowGuarantee<VecT>);
+
+ EXPECT_TRUE(tester.Test([](VecT* vec) {
+ vec->pop_back(); //
+ }));
+}
+
+TYPED_TEST(OneSizeTest, Erase) {
+ using VecT = typename TypeParam::VecT;
+ constexpr static auto size = TypeParam::GetSizeAt(0);
+
+ auto tester = testing::MakeExceptionSafetyTester()
+ .WithInitialValue(VecT{size})
+ .WithContracts(InlinedVectorInvariants<VecT>);
+
+ EXPECT_TRUE(tester.Test([](VecT* vec) {
+ auto it = vec->begin();
+ vec->erase(it);
+ }));
+ EXPECT_TRUE(tester.Test([](VecT* vec) {
+ auto it = vec->begin() + (vec->size() / 2);
+ vec->erase(it);
+ }));
+ EXPECT_TRUE(tester.Test([](VecT* vec) {
+ auto it = vec->begin() + (vec->size() - 1);
+ vec->erase(it);
+ }));
+
+ EXPECT_TRUE(tester.Test([](VecT* vec) {
+ auto it = vec->begin();
+ vec->erase(it, it);
+ }));
+ EXPECT_TRUE(tester.Test([](VecT* vec) {
+ auto it = vec->begin() + (vec->size() / 2);
+ vec->erase(it, it);
+ }));
+ EXPECT_TRUE(tester.Test([](VecT* vec) {
+ auto it = vec->begin() + (vec->size() - 1);
+ vec->erase(it, it);
+ }));
+
+ EXPECT_TRUE(tester.Test([](VecT* vec) {
+ auto it = vec->begin();
+ vec->erase(it, it + 1);
+ }));
+ EXPECT_TRUE(tester.Test([](VecT* vec) {
+ auto it = vec->begin() + (vec->size() / 2);
+ vec->erase(it, it + 1);
+ }));
+ EXPECT_TRUE(tester.Test([](VecT* vec) {
+ auto it = vec->begin() + (vec->size() - 1);
+ vec->erase(it, it + 1);
+ }));
+}
+
+TYPED_TEST(OneSizeTest, Clear) {
+ using VecT = typename TypeParam::VecT;
+ constexpr static auto size = TypeParam::GetSizeAt(0);
+
+ auto tester = testing::MakeExceptionSafetyTester()
+ .WithInitialValue(VecT{size})
+ .WithContracts(NoThrowGuarantee<VecT>);
+
+ EXPECT_TRUE(tester.Test([](VecT* vec) {
+ vec->clear(); //
+ }));
+}
+
+TYPED_TEST(TwoSizeTest, Reserve) {
+ using VecT = typename TypeParam::VecT;
+ constexpr static auto from_size = TypeParam::GetSizeAt(0);
+ constexpr static auto to_capacity = TypeParam::GetSizeAt(1);
+
+ auto tester = testing::MakeExceptionSafetyTester()
+ .WithInitialValue(VecT{from_size})
+ .WithContracts(InlinedVectorInvariants<VecT>);
+
+ EXPECT_TRUE(tester.Test([](VecT* vec) { vec->reserve(to_capacity); }));
+}
+
+TYPED_TEST(OneSizeTest, ShrinkToFit) {
+ using VecT = typename TypeParam::VecT;
+ constexpr static auto size = TypeParam::GetSizeAt(0);
+
+ auto tester = testing::MakeExceptionSafetyTester()
+ .WithInitialValue(VecT{size})
+ .WithContracts(InlinedVectorInvariants<VecT>);
+
+ EXPECT_TRUE(tester.Test([](VecT* vec) {
+ vec->shrink_to_fit(); //
+ }));
+}
+
+TYPED_TEST(TwoSizeTest, Swap) {
+ using VecT = typename TypeParam::VecT;
+ constexpr static auto from_size = TypeParam::GetSizeAt(0);
+ constexpr static auto to_size = TypeParam::GetSizeAt(1);
+
+ auto tester = testing::MakeExceptionSafetyTester()
+ .WithInitialValue(VecT{from_size})
+ .WithContracts(InlinedVectorInvariants<VecT>);
+
+ EXPECT_TRUE(tester.Test([](VecT* vec) {
+ VecT other_vec{to_size};
+ vec->swap(other_vec);
+ }));
+
+ EXPECT_TRUE(tester.Test([](VecT* vec) {
+ using std::swap;
+ VecT other_vec{to_size};
+ swap(*vec, other_vec);
+ }));
+}
+
+} // namespace
+
+#endif // defined(ABSL_HAVE_EXCEPTIONS)
diff --git a/third_party/abseil/src/absl/container/inlined_vector_test.cc b/third_party/abseil/src/absl/container/inlined_vector_test.cc
new file mode 100644
index 0000000..98aff33
--- /dev/null
+++ b/third_party/abseil/src/absl/container/inlined_vector_test.cc
@@ -0,0 +1,1815 @@
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/container/inlined_vector.h"
+
+#include <algorithm>
+#include <forward_list>
+#include <list>
+#include <memory>
+#include <scoped_allocator>
+#include <sstream>
+#include <stdexcept>
+#include <string>
+#include <vector>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/base/attributes.h"
+#include "absl/base/internal/exception_testing.h"
+#include "absl/base/internal/raw_logging.h"
+#include "absl/base/macros.h"
+#include "absl/base/options.h"
+#include "absl/container/internal/counting_allocator.h"
+#include "absl/container/internal/test_instance_tracker.h"
+#include "absl/hash/hash_testing.h"
+#include "absl/memory/memory.h"
+#include "absl/strings/str_cat.h"
+
+namespace {
+
+using absl::container_internal::CountingAllocator;
+using absl::test_internal::CopyableMovableInstance;
+using absl::test_internal::CopyableOnlyInstance;
+using absl::test_internal::InstanceTracker;
+using testing::AllOf;
+using testing::Each;
+using testing::ElementsAre;
+using testing::ElementsAreArray;
+using testing::Eq;
+using testing::Gt;
+using testing::PrintToString;
+
+using IntVec = absl::InlinedVector<int, 8>;
+
+MATCHER_P(SizeIs, n, "") {
+ return testing::ExplainMatchResult(n, arg.size(), result_listener);
+}
+
+MATCHER_P(CapacityIs, n, "") {
+ return testing::ExplainMatchResult(n, arg.capacity(), result_listener);
+}
+
+MATCHER_P(ValueIs, e, "") {
+ return testing::ExplainMatchResult(e, arg.value(), result_listener);
+}
+
+// TODO(bsamwel): Add support for movable-only types.
+
+// Test fixture for typed tests on BaseCountedInstance derived classes, see
+// test_instance_tracker.h.
+template <typename T>
+class InstanceTest : public ::testing::Test {};
+TYPED_TEST_SUITE_P(InstanceTest);
+
+// A simple reference counted class to make sure that the proper elements are
+// destroyed in the erase(begin, end) test.
+class RefCounted {
+ public:
+ RefCounted(int value, int* count) : value_(value), count_(count) { Ref(); }
+
+ RefCounted(const RefCounted& v) : value_(v.value_), count_(v.count_) {
+ Ref();
+ }
+
+ ~RefCounted() {
+ Unref();
+ count_ = nullptr;
+ }
+
+ friend void swap(RefCounted& a, RefCounted& b) {
+ using std::swap;
+ swap(a.value_, b.value_);
+ swap(a.count_, b.count_);
+ }
+
+ RefCounted& operator=(RefCounted v) {
+ using std::swap;
+ swap(*this, v);
+ return *this;
+ }
+
+ void Ref() const {
+ ABSL_RAW_CHECK(count_ != nullptr, "");
+ ++(*count_);
+ }
+
+ void Unref() const {
+ --(*count_);
+ ABSL_RAW_CHECK(*count_ >= 0, "");
+ }
+
+ int value_;
+ int* count_;
+};
+
+using RefCountedVec = absl::InlinedVector<RefCounted, 8>;
+
+// A class with a vtable pointer
+class Dynamic {
+ public:
+ virtual ~Dynamic() {}
+};
+
+using DynamicVec = absl::InlinedVector<Dynamic, 8>;
+
+// Append 0..len-1 to *v
+template <typename Container>
+static void Fill(Container* v, int len, int offset = 0) {
+ for (int i = 0; i < len; i++) {
+ v->push_back(i + offset);
+ }
+}
+
+static IntVec Fill(int len, int offset = 0) {
+ IntVec v;
+ Fill(&v, len, offset);
+ return v;
+}
+
+TEST(IntVec, SimpleOps) {
+ for (int len = 0; len < 20; len++) {
+ IntVec v;
+ const IntVec& cv = v; // const alias
+
+ Fill(&v, len);
+ EXPECT_EQ(len, v.size());
+ EXPECT_LE(len, v.capacity());
+
+ for (int i = 0; i < len; i++) {
+ EXPECT_EQ(i, v[i]);
+ EXPECT_EQ(i, v.at(i));
+ }
+ EXPECT_EQ(v.begin(), v.data());
+ EXPECT_EQ(cv.begin(), cv.data());
+
+ int counter = 0;
+ for (IntVec::iterator iter = v.begin(); iter != v.end(); ++iter) {
+ EXPECT_EQ(counter, *iter);
+ counter++;
+ }
+ EXPECT_EQ(counter, len);
+
+ counter = 0;
+ for (IntVec::const_iterator iter = v.begin(); iter != v.end(); ++iter) {
+ EXPECT_EQ(counter, *iter);
+ counter++;
+ }
+ EXPECT_EQ(counter, len);
+
+ counter = 0;
+ for (IntVec::const_iterator iter = v.cbegin(); iter != v.cend(); ++iter) {
+ EXPECT_EQ(counter, *iter);
+ counter++;
+ }
+ EXPECT_EQ(counter, len);
+
+ if (len > 0) {
+ EXPECT_EQ(0, v.front());
+ EXPECT_EQ(len - 1, v.back());
+ v.pop_back();
+ EXPECT_EQ(len - 1, v.size());
+ for (int i = 0; i < v.size(); ++i) {
+ EXPECT_EQ(i, v[i]);
+ EXPECT_EQ(i, v.at(i));
+ }
+ }
+ }
+}
+
+TEST(IntVec, PopBackNoOverflow) {
+ IntVec v = {1};
+ v.pop_back();
+ EXPECT_EQ(v.size(), 0);
+}
+
+TEST(IntVec, AtThrows) {
+ IntVec v = {1, 2, 3};
+ EXPECT_EQ(v.at(2), 3);
+ ABSL_BASE_INTERNAL_EXPECT_FAIL(v.at(3), std::out_of_range,
+ "failed bounds check");
+}
+
+TEST(IntVec, ReverseIterator) {
+ for (int len = 0; len < 20; len++) {
+ IntVec v;
+ Fill(&v, len);
+
+ int counter = len;
+ for (IntVec::reverse_iterator iter = v.rbegin(); iter != v.rend(); ++iter) {
+ counter--;
+ EXPECT_EQ(counter, *iter);
+ }
+ EXPECT_EQ(counter, 0);
+
+ counter = len;
+ for (IntVec::const_reverse_iterator iter = v.rbegin(); iter != v.rend();
+ ++iter) {
+ counter--;
+ EXPECT_EQ(counter, *iter);
+ }
+ EXPECT_EQ(counter, 0);
+
+ counter = len;
+ for (IntVec::const_reverse_iterator iter = v.crbegin(); iter != v.crend();
+ ++iter) {
+ counter--;
+ EXPECT_EQ(counter, *iter);
+ }
+ EXPECT_EQ(counter, 0);
+ }
+}
+
+TEST(IntVec, Erase) {
+ for (int len = 1; len < 20; len++) {
+ for (int i = 0; i < len; ++i) {
+ IntVec v;
+ Fill(&v, len);
+ v.erase(v.begin() + i);
+ EXPECT_EQ(len - 1, v.size());
+ for (int j = 0; j < i; ++j) {
+ EXPECT_EQ(j, v[j]);
+ }
+ for (int j = i; j < len - 1; ++j) {
+ EXPECT_EQ(j + 1, v[j]);
+ }
+ }
+ }
+}
+
+TEST(IntVec, Hardened) {
+ IntVec v;
+ Fill(&v, 10);
+ EXPECT_EQ(v[9], 9);
+#if !defined(NDEBUG) || ABSL_OPTION_HARDENED
+ EXPECT_DEATH_IF_SUPPORTED(v[10], "");
+ EXPECT_DEATH_IF_SUPPORTED(v[-1], "");
+#endif
+}
+
+// At the end of this test loop, the elements between [erase_begin, erase_end)
+// should have reference counts == 0, and all others elements should have
+// reference counts == 1.
+TEST(RefCountedVec, EraseBeginEnd) {
+ for (int len = 1; len < 20; ++len) {
+ for (int erase_begin = 0; erase_begin < len; ++erase_begin) {
+ for (int erase_end = erase_begin; erase_end <= len; ++erase_end) {
+ std::vector<int> counts(len, 0);
+ RefCountedVec v;
+ for (int i = 0; i < len; ++i) {
+ v.push_back(RefCounted(i, &counts[i]));
+ }
+
+ int erase_len = erase_end - erase_begin;
+
+ v.erase(v.begin() + erase_begin, v.begin() + erase_end);
+
+ EXPECT_EQ(len - erase_len, v.size());
+
+ // Check the elements before the first element erased.
+ for (int i = 0; i < erase_begin; ++i) {
+ EXPECT_EQ(i, v[i].value_);
+ }
+
+ // Check the elements after the first element erased.
+ for (int i = erase_begin; i < v.size(); ++i) {
+ EXPECT_EQ(i + erase_len, v[i].value_);
+ }
+
+ // Check that the elements at the beginning are preserved.
+ for (int i = 0; i < erase_begin; ++i) {
+ EXPECT_EQ(1, counts[i]);
+ }
+
+ // Check that the erased elements are destroyed
+ for (int i = erase_begin; i < erase_end; ++i) {
+ EXPECT_EQ(0, counts[i]);
+ }
+
+ // Check that the elements at the end are preserved.
+ for (int i = erase_end; i < len; ++i) {
+ EXPECT_EQ(1, counts[i]);
+ }
+ }
+ }
+ }
+}
+
+struct NoDefaultCtor {
+ explicit NoDefaultCtor(int) {}
+};
+struct NoCopy {
+ NoCopy() {}
+ NoCopy(const NoCopy&) = delete;
+};
+struct NoAssign {
+ NoAssign() {}
+ NoAssign& operator=(const NoAssign&) = delete;
+};
+struct MoveOnly {
+ MoveOnly() {}
+ MoveOnly(MoveOnly&&) = default;
+ MoveOnly& operator=(MoveOnly&&) = default;
+};
+TEST(InlinedVectorTest, NoDefaultCtor) {
+ absl::InlinedVector<NoDefaultCtor, 1> v(10, NoDefaultCtor(2));
+ (void)v;
+}
+TEST(InlinedVectorTest, NoCopy) {
+ absl::InlinedVector<NoCopy, 1> v(10);
+ (void)v;
+}
+TEST(InlinedVectorTest, NoAssign) {
+ absl::InlinedVector<NoAssign, 1> v(10);
+ (void)v;
+}
+TEST(InlinedVectorTest, MoveOnly) {
+ absl::InlinedVector<MoveOnly, 2> v;
+ v.push_back(MoveOnly{});
+ v.push_back(MoveOnly{});
+ v.push_back(MoveOnly{});
+ v.erase(v.begin());
+ v.push_back(MoveOnly{});
+ v.erase(v.begin(), v.begin() + 1);
+ v.insert(v.begin(), MoveOnly{});
+ v.emplace(v.begin());
+ v.emplace(v.begin(), MoveOnly{});
+}
+TEST(InlinedVectorTest, Noexcept) {
+ EXPECT_TRUE(std::is_nothrow_move_constructible<IntVec>::value);
+ EXPECT_TRUE((std::is_nothrow_move_constructible<
+ absl::InlinedVector<MoveOnly, 2>>::value));
+
+ struct MoveCanThrow {
+ MoveCanThrow(MoveCanThrow&&) {}
+ };
+ EXPECT_EQ(absl::default_allocator_is_nothrow::value,
+ (std::is_nothrow_move_constructible<
+ absl::InlinedVector<MoveCanThrow, 2>>::value));
+}
+
+TEST(InlinedVectorTest, EmplaceBack) {
+ absl::InlinedVector<std::pair<std::string, int>, 1> v;
+
+ auto& inlined_element = v.emplace_back("answer", 42);
+ EXPECT_EQ(&inlined_element, &v[0]);
+ EXPECT_EQ(inlined_element.first, "answer");
+ EXPECT_EQ(inlined_element.second, 42);
+
+ auto& allocated_element = v.emplace_back("taxicab", 1729);
+ EXPECT_EQ(&allocated_element, &v[1]);
+ EXPECT_EQ(allocated_element.first, "taxicab");
+ EXPECT_EQ(allocated_element.second, 1729);
+}
+
+TEST(InlinedVectorTest, ShrinkToFitGrowingVector) {
+ absl::InlinedVector<std::pair<std::string, int>, 1> v;
+
+ v.shrink_to_fit();
+ EXPECT_EQ(v.capacity(), 1);
+
+ v.emplace_back("answer", 42);
+ v.shrink_to_fit();
+ EXPECT_EQ(v.capacity(), 1);
+
+ v.emplace_back("taxicab", 1729);
+ EXPECT_GE(v.capacity(), 2);
+ v.shrink_to_fit();
+ EXPECT_EQ(v.capacity(), 2);
+
+ v.reserve(100);
+ EXPECT_GE(v.capacity(), 100);
+ v.shrink_to_fit();
+ EXPECT_EQ(v.capacity(), 2);
+}
+
+TEST(InlinedVectorTest, ShrinkToFitEdgeCases) {
+ {
+ absl::InlinedVector<std::pair<std::string, int>, 1> v;
+ v.emplace_back("answer", 42);
+ v.emplace_back("taxicab", 1729);
+ EXPECT_GE(v.capacity(), 2);
+ v.pop_back();
+ v.shrink_to_fit();
+ EXPECT_EQ(v.capacity(), 1);
+ EXPECT_EQ(v[0].first, "answer");
+ EXPECT_EQ(v[0].second, 42);
+ }
+
+ {
+ absl::InlinedVector<std::string, 2> v(100);
+ v.resize(0);
+ v.shrink_to_fit();
+ EXPECT_EQ(v.capacity(), 2); // inlined capacity
+ }
+
+ {
+ absl::InlinedVector<std::string, 2> v(100);
+ v.resize(1);
+ v.shrink_to_fit();
+ EXPECT_EQ(v.capacity(), 2); // inlined capacity
+ }
+
+ {
+ absl::InlinedVector<std::string, 2> v(100);
+ v.resize(2);
+ v.shrink_to_fit();
+ EXPECT_EQ(v.capacity(), 2);
+ }
+
+ {
+ absl::InlinedVector<std::string, 2> v(100);
+ v.resize(3);
+ v.shrink_to_fit();
+ EXPECT_EQ(v.capacity(), 3);
+ }
+}
+
+TEST(IntVec, Insert) {
+ for (int len = 0; len < 20; len++) {
+ for (int pos = 0; pos <= len; pos++) {
+ {
+ // Single element
+ std::vector<int> std_v;
+ Fill(&std_v, len);
+ IntVec v;
+ Fill(&v, len);
+
+ std_v.insert(std_v.begin() + pos, 9999);
+ IntVec::iterator it = v.insert(v.cbegin() + pos, 9999);
+ EXPECT_THAT(v, ElementsAreArray(std_v));
+ EXPECT_EQ(it, v.cbegin() + pos);
+ }
+ {
+ // n elements
+ std::vector<int> std_v;
+ Fill(&std_v, len);
+ IntVec v;
+ Fill(&v, len);
+
+ IntVec::size_type n = 5;
+ std_v.insert(std_v.begin() + pos, n, 9999);
+ IntVec::iterator it = v.insert(v.cbegin() + pos, n, 9999);
+ EXPECT_THAT(v, ElementsAreArray(std_v));
+ EXPECT_EQ(it, v.cbegin() + pos);
+ }
+ {
+ // Iterator range (random access iterator)
+ std::vector<int> std_v;
+ Fill(&std_v, len);
+ IntVec v;
+ Fill(&v, len);
+
+ const std::vector<int> input = {9999, 8888, 7777};
+ std_v.insert(std_v.begin() + pos, input.cbegin(), input.cend());
+ IntVec::iterator it =
+ v.insert(v.cbegin() + pos, input.cbegin(), input.cend());
+ EXPECT_THAT(v, ElementsAreArray(std_v));
+ EXPECT_EQ(it, v.cbegin() + pos);
+ }
+ {
+ // Iterator range (forward iterator)
+ std::vector<int> std_v;
+ Fill(&std_v, len);
+ IntVec v;
+ Fill(&v, len);
+
+ const std::forward_list<int> input = {9999, 8888, 7777};
+ std_v.insert(std_v.begin() + pos, input.cbegin(), input.cend());
+ IntVec::iterator it =
+ v.insert(v.cbegin() + pos, input.cbegin(), input.cend());
+ EXPECT_THAT(v, ElementsAreArray(std_v));
+ EXPECT_EQ(it, v.cbegin() + pos);
+ }
+ {
+ // Iterator range (input iterator)
+ std::vector<int> std_v;
+ Fill(&std_v, len);
+ IntVec v;
+ Fill(&v, len);
+
+ std_v.insert(std_v.begin() + pos, {9999, 8888, 7777});
+ std::istringstream input("9999 8888 7777");
+ IntVec::iterator it =
+ v.insert(v.cbegin() + pos, std::istream_iterator<int>(input),
+ std::istream_iterator<int>());
+ EXPECT_THAT(v, ElementsAreArray(std_v));
+ EXPECT_EQ(it, v.cbegin() + pos);
+ }
+ {
+ // Initializer list
+ std::vector<int> std_v;
+ Fill(&std_v, len);
+ IntVec v;
+ Fill(&v, len);
+
+ std_v.insert(std_v.begin() + pos, {9999, 8888});
+ IntVec::iterator it = v.insert(v.cbegin() + pos, {9999, 8888});
+ EXPECT_THAT(v, ElementsAreArray(std_v));
+ EXPECT_EQ(it, v.cbegin() + pos);
+ }
+ }
+ }
+}
+
+TEST(RefCountedVec, InsertConstructorDestructor) {
+ // Make sure the proper construction/destruction happen during insert
+ // operations.
+ for (int len = 0; len < 20; len++) {
+ SCOPED_TRACE(len);
+ for (int pos = 0; pos <= len; pos++) {
+ SCOPED_TRACE(pos);
+ std::vector<int> counts(len, 0);
+ int inserted_count = 0;
+ RefCountedVec v;
+ for (int i = 0; i < len; ++i) {
+ SCOPED_TRACE(i);
+ v.push_back(RefCounted(i, &counts[i]));
+ }
+
+ EXPECT_THAT(counts, Each(Eq(1)));
+
+ RefCounted insert_element(9999, &inserted_count);
+ EXPECT_EQ(1, inserted_count);
+ v.insert(v.begin() + pos, insert_element);
+ EXPECT_EQ(2, inserted_count);
+ // Check that the elements at the end are preserved.
+ EXPECT_THAT(counts, Each(Eq(1)));
+ EXPECT_EQ(2, inserted_count);
+ }
+ }
+}
+
+TEST(IntVec, Resize) {
+ for (int len = 0; len < 20; len++) {
+ IntVec v;
+ Fill(&v, len);
+
+ // Try resizing up and down by k elements
+ static const int kResizeElem = 1000000;
+ for (int k = 0; k < 10; k++) {
+ // Enlarging resize
+ v.resize(len + k, kResizeElem);
+ EXPECT_EQ(len + k, v.size());
+ EXPECT_LE(len + k, v.capacity());
+ for (int i = 0; i < len + k; i++) {
+ if (i < len) {
+ EXPECT_EQ(i, v[i]);
+ } else {
+ EXPECT_EQ(kResizeElem, v[i]);
+ }
+ }
+
+ // Shrinking resize
+ v.resize(len, kResizeElem);
+ EXPECT_EQ(len, v.size());
+ EXPECT_LE(len, v.capacity());
+ for (int i = 0; i < len; i++) {
+ EXPECT_EQ(i, v[i]);
+ }
+ }
+ }
+}
+
+TEST(IntVec, InitWithLength) {
+ for (int len = 0; len < 20; len++) {
+ IntVec v(len, 7);
+ EXPECT_EQ(len, v.size());
+ EXPECT_LE(len, v.capacity());
+ for (int i = 0; i < len; i++) {
+ EXPECT_EQ(7, v[i]);
+ }
+ }
+}
+
+TEST(IntVec, CopyConstructorAndAssignment) {
+ for (int len = 0; len < 20; len++) {
+ IntVec v;
+ Fill(&v, len);
+ EXPECT_EQ(len, v.size());
+ EXPECT_LE(len, v.capacity());
+
+ IntVec v2(v);
+ EXPECT_TRUE(v == v2) << PrintToString(v) << PrintToString(v2);
+
+ for (int start_len = 0; start_len < 20; start_len++) {
+ IntVec v3;
+ Fill(&v3, start_len, 99); // Add dummy elements that should go away
+ v3 = v;
+ EXPECT_TRUE(v == v3) << PrintToString(v) << PrintToString(v3);
+ }
+ }
+}
+
+TEST(IntVec, AliasingCopyAssignment) {
+ for (int len = 0; len < 20; ++len) {
+ IntVec original;
+ Fill(&original, len);
+ IntVec dup = original;
+ dup = *&dup;
+ EXPECT_EQ(dup, original);
+ }
+}
+
+TEST(IntVec, MoveConstructorAndAssignment) {
+ for (int len = 0; len < 20; len++) {
+ IntVec v_in;
+ const int inlined_capacity = v_in.capacity();
+ Fill(&v_in, len);
+ EXPECT_EQ(len, v_in.size());
+ EXPECT_LE(len, v_in.capacity());
+
+ {
+ IntVec v_temp(v_in);
+ auto* old_data = v_temp.data();
+ IntVec v_out(std::move(v_temp));
+ EXPECT_TRUE(v_in == v_out) << PrintToString(v_in) << PrintToString(v_out);
+ if (v_in.size() > inlined_capacity) {
+ // Allocation is moved as a whole, data stays in place.
+ EXPECT_TRUE(v_out.data() == old_data);
+ } else {
+ EXPECT_FALSE(v_out.data() == old_data);
+ }
+ }
+ for (int start_len = 0; start_len < 20; start_len++) {
+ IntVec v_out;
+ Fill(&v_out, start_len, 99); // Add dummy elements that should go away
+ IntVec v_temp(v_in);
+ auto* old_data = v_temp.data();
+ v_out = std::move(v_temp);
+ EXPECT_TRUE(v_in == v_out) << PrintToString(v_in) << PrintToString(v_out);
+ if (v_in.size() > inlined_capacity) {
+ // Allocation is moved as a whole, data stays in place.
+ EXPECT_TRUE(v_out.data() == old_data);
+ } else {
+ EXPECT_FALSE(v_out.data() == old_data);
+ }
+ }
+ }
+}
+
+class NotTriviallyDestructible {
+ public:
+ NotTriviallyDestructible() : p_(new int(1)) {}
+ explicit NotTriviallyDestructible(int i) : p_(new int(i)) {}
+
+ NotTriviallyDestructible(const NotTriviallyDestructible& other)
+ : p_(new int(*other.p_)) {}
+
+ NotTriviallyDestructible& operator=(const NotTriviallyDestructible& other) {
+ p_ = absl::make_unique<int>(*other.p_);
+ return *this;
+ }
+
+ bool operator==(const NotTriviallyDestructible& other) const {
+ return *p_ == *other.p_;
+ }
+
+ private:
+ std::unique_ptr<int> p_;
+};
+
+TEST(AliasingTest, Emplace) {
+ for (int i = 2; i < 20; ++i) {
+ absl::InlinedVector<NotTriviallyDestructible, 10> vec;
+ for (int j = 0; j < i; ++j) {
+ vec.push_back(NotTriviallyDestructible(j));
+ }
+ vec.emplace(vec.begin(), vec[0]);
+ EXPECT_EQ(vec[0], vec[1]);
+ vec.emplace(vec.begin() + i / 2, vec[i / 2]);
+ EXPECT_EQ(vec[i / 2], vec[i / 2 + 1]);
+ vec.emplace(vec.end() - 1, vec.back());
+ EXPECT_EQ(vec[vec.size() - 2], vec.back());
+ }
+}
+
+TEST(AliasingTest, InsertWithCount) {
+ for (int i = 1; i < 20; ++i) {
+ absl::InlinedVector<NotTriviallyDestructible, 10> vec;
+ for (int j = 0; j < i; ++j) {
+ vec.push_back(NotTriviallyDestructible(j));
+ }
+ for (int n = 0; n < 5; ++n) {
+ // We use back where we can because it's guaranteed to become invalidated
+ vec.insert(vec.begin(), n, vec.back());
+ auto b = vec.begin();
+ EXPECT_TRUE(
+ std::all_of(b, b + n, [&vec](const NotTriviallyDestructible& x) {
+ return x == vec.back();
+ }));
+
+ auto m_idx = vec.size() / 2;
+ vec.insert(vec.begin() + m_idx, n, vec.back());
+ auto m = vec.begin() + m_idx;
+ EXPECT_TRUE(
+ std::all_of(m, m + n, [&vec](const NotTriviallyDestructible& x) {
+ return x == vec.back();
+ }));
+
+ // We want distinct values so the equality test is meaningful,
+ // vec[vec.size() - 1] is also almost always invalidated.
+ auto old_e = vec.size() - 1;
+ auto val = vec[old_e];
+ vec.insert(vec.end(), n, vec[old_e]);
+ auto e = vec.begin() + old_e;
+ EXPECT_TRUE(std::all_of(
+ e, e + n,
+ [&val](const NotTriviallyDestructible& x) { return x == val; }));
+ }
+ }
+}
+
+TEST(OverheadTest, Storage) {
+ // Check for size overhead.
+ // In particular, ensure that std::allocator doesn't cost anything to store.
+ // The union should be absorbing some of the allocation bookkeeping overhead
+ // in the larger vectors, leaving only the size_ field as overhead.
+
+ struct T { void* val; };
+ size_t expected_overhead = sizeof(T);
+
+ EXPECT_EQ((2 * expected_overhead),
+ sizeof(absl::InlinedVector<T, 1>) - sizeof(T[1]));
+ EXPECT_EQ(expected_overhead,
+ sizeof(absl::InlinedVector<T, 2>) - sizeof(T[2]));
+ EXPECT_EQ(expected_overhead,
+ sizeof(absl::InlinedVector<T, 3>) - sizeof(T[3]));
+ EXPECT_EQ(expected_overhead,
+ sizeof(absl::InlinedVector<T, 4>) - sizeof(T[4]));
+ EXPECT_EQ(expected_overhead,
+ sizeof(absl::InlinedVector<T, 5>) - sizeof(T[5]));
+ EXPECT_EQ(expected_overhead,
+ sizeof(absl::InlinedVector<T, 6>) - sizeof(T[6]));
+ EXPECT_EQ(expected_overhead,
+ sizeof(absl::InlinedVector<T, 7>) - sizeof(T[7]));
+ EXPECT_EQ(expected_overhead,
+ sizeof(absl::InlinedVector<T, 8>) - sizeof(T[8]));
+}
+
+TEST(IntVec, Clear) {
+ for (int len = 0; len < 20; len++) {
+ SCOPED_TRACE(len);
+ IntVec v;
+ Fill(&v, len);
+ v.clear();
+ EXPECT_EQ(0, v.size());
+ EXPECT_EQ(v.begin(), v.end());
+ }
+}
+
+TEST(IntVec, Reserve) {
+ for (int len = 0; len < 20; len++) {
+ IntVec v;
+ Fill(&v, len);
+
+ for (int newlen = 0; newlen < 100; newlen++) {
+ const int* start_rep = v.data();
+ v.reserve(newlen);
+ const int* final_rep = v.data();
+ if (newlen <= len) {
+ EXPECT_EQ(start_rep, final_rep);
+ }
+ EXPECT_LE(newlen, v.capacity());
+
+ // Filling up to newlen should not change rep
+ while (v.size() < newlen) {
+ v.push_back(0);
+ }
+ EXPECT_EQ(final_rep, v.data());
+ }
+ }
+}
+
+TEST(StringVec, SelfRefPushBack) {
+ std::vector<std::string> std_v;
+ absl::InlinedVector<std::string, 4> v;
+ const std::string s = "A quite long string to ensure heap.";
+ std_v.push_back(s);
+ v.push_back(s);
+ for (int i = 0; i < 20; ++i) {
+ EXPECT_THAT(v, ElementsAreArray(std_v));
+
+ v.push_back(v.back());
+ std_v.push_back(std_v.back());
+ }
+ EXPECT_THAT(v, ElementsAreArray(std_v));
+}
+
+TEST(StringVec, SelfRefPushBackWithMove) {
+ std::vector<std::string> std_v;
+ absl::InlinedVector<std::string, 4> v;
+ const std::string s = "A quite long string to ensure heap.";
+ std_v.push_back(s);
+ v.push_back(s);
+ for (int i = 0; i < 20; ++i) {
+ EXPECT_EQ(v.back(), std_v.back());
+
+ v.push_back(std::move(v.back()));
+ std_v.push_back(std::move(std_v.back()));
+ }
+ EXPECT_EQ(v.back(), std_v.back());
+}
+
+TEST(StringVec, SelfMove) {
+ const std::string s = "A quite long string to ensure heap.";
+ for (int len = 0; len < 20; len++) {
+ SCOPED_TRACE(len);
+ absl::InlinedVector<std::string, 8> v;
+ for (int i = 0; i < len; ++i) {
+ SCOPED_TRACE(i);
+ v.push_back(s);
+ }
+ // Indirection necessary to avoid compiler warning.
+ v = std::move(*(&v));
+ // Ensure that the inlined vector is still in a valid state by copying it.
+ // We don't expect specific contents since a self-move results in an
+ // unspecified valid state.
+ std::vector<std::string> copy(v.begin(), v.end());
+ }
+}
+
+TEST(IntVec, Swap) {
+ for (int l1 = 0; l1 < 20; l1++) {
+ SCOPED_TRACE(l1);
+ for (int l2 = 0; l2 < 20; l2++) {
+ SCOPED_TRACE(l2);
+ IntVec a = Fill(l1, 0);
+ IntVec b = Fill(l2, 100);
+ {
+ using std::swap;
+ swap(a, b);
+ }
+ EXPECT_EQ(l1, b.size());
+ EXPECT_EQ(l2, a.size());
+ for (int i = 0; i < l1; i++) {
+ SCOPED_TRACE(i);
+ EXPECT_EQ(i, b[i]);
+ }
+ for (int i = 0; i < l2; i++) {
+ SCOPED_TRACE(i);
+ EXPECT_EQ(100 + i, a[i]);
+ }
+ }
+ }
+}
+
+TYPED_TEST_P(InstanceTest, Swap) {
+ using Instance = TypeParam;
+ using InstanceVec = absl::InlinedVector<Instance, 8>;
+ for (int l1 = 0; l1 < 20; l1++) {
+ SCOPED_TRACE(l1);
+ for (int l2 = 0; l2 < 20; l2++) {
+ SCOPED_TRACE(l2);
+ InstanceTracker tracker;
+ InstanceVec a, b;
+ const size_t inlined_capacity = a.capacity();
+ auto min_len = std::min(l1, l2);
+ auto max_len = std::max(l1, l2);
+ for (int i = 0; i < l1; i++) a.push_back(Instance(i));
+ for (int i = 0; i < l2; i++) b.push_back(Instance(100 + i));
+ EXPECT_EQ(tracker.instances(), l1 + l2);
+ tracker.ResetCopiesMovesSwaps();
+ {
+ using std::swap;
+ swap(a, b);
+ }
+ EXPECT_EQ(tracker.instances(), l1 + l2);
+ if (a.size() > inlined_capacity && b.size() > inlined_capacity) {
+ EXPECT_EQ(tracker.swaps(), 0); // Allocations are swapped.
+ EXPECT_EQ(tracker.moves(), 0);
+ } else if (a.size() <= inlined_capacity && b.size() <= inlined_capacity) {
+ EXPECT_EQ(tracker.swaps(), min_len);
+ EXPECT_EQ((tracker.moves() ? tracker.moves() : tracker.copies()),
+ max_len - min_len);
+ } else {
+ // One is allocated and the other isn't. The allocation is transferred
+ // without copying elements, and the inlined instances are copied/moved.
+ EXPECT_EQ(tracker.swaps(), 0);
+ EXPECT_EQ((tracker.moves() ? tracker.moves() : tracker.copies()),
+ min_len);
+ }
+
+ EXPECT_EQ(l1, b.size());
+ EXPECT_EQ(l2, a.size());
+ for (int i = 0; i < l1; i++) {
+ EXPECT_EQ(i, b[i].value());
+ }
+ for (int i = 0; i < l2; i++) {
+ EXPECT_EQ(100 + i, a[i].value());
+ }
+ }
+ }
+}
+
+TEST(IntVec, EqualAndNotEqual) {
+ IntVec a, b;
+ EXPECT_TRUE(a == b);
+ EXPECT_FALSE(a != b);
+
+ a.push_back(3);
+ EXPECT_FALSE(a == b);
+ EXPECT_TRUE(a != b);
+
+ b.push_back(3);
+ EXPECT_TRUE(a == b);
+ EXPECT_FALSE(a != b);
+
+ b.push_back(7);
+ EXPECT_FALSE(a == b);
+ EXPECT_TRUE(a != b);
+
+ a.push_back(6);
+ EXPECT_FALSE(a == b);
+ EXPECT_TRUE(a != b);
+
+ a.clear();
+ b.clear();
+ for (int i = 0; i < 100; i++) {
+ a.push_back(i);
+ b.push_back(i);
+ EXPECT_TRUE(a == b);
+ EXPECT_FALSE(a != b);
+
+ b[i] = b[i] + 1;
+ EXPECT_FALSE(a == b);
+ EXPECT_TRUE(a != b);
+
+ b[i] = b[i] - 1; // Back to before
+ EXPECT_TRUE(a == b);
+ EXPECT_FALSE(a != b);
+ }
+}
+
+TEST(IntVec, RelationalOps) {
+ IntVec a, b;
+ EXPECT_FALSE(a < b);
+ EXPECT_FALSE(b < a);
+ EXPECT_FALSE(a > b);
+ EXPECT_FALSE(b > a);
+ EXPECT_TRUE(a <= b);
+ EXPECT_TRUE(b <= a);
+ EXPECT_TRUE(a >= b);
+ EXPECT_TRUE(b >= a);
+ b.push_back(3);
+ EXPECT_TRUE(a < b);
+ EXPECT_FALSE(b < a);
+ EXPECT_FALSE(a > b);
+ EXPECT_TRUE(b > a);
+ EXPECT_TRUE(a <= b);
+ EXPECT_FALSE(b <= a);
+ EXPECT_FALSE(a >= b);
+ EXPECT_TRUE(b >= a);
+}
+
+TYPED_TEST_P(InstanceTest, CountConstructorsDestructors) {
+ using Instance = TypeParam;
+ using InstanceVec = absl::InlinedVector<Instance, 8>;
+ InstanceTracker tracker;
+ for (int len = 0; len < 20; len++) {
+ SCOPED_TRACE(len);
+ tracker.ResetCopiesMovesSwaps();
+
+ InstanceVec v;
+ const size_t inlined_capacity = v.capacity();
+ for (int i = 0; i < len; i++) {
+ v.push_back(Instance(i));
+ }
+ EXPECT_EQ(tracker.instances(), len);
+ EXPECT_GE(tracker.copies() + tracker.moves(),
+ len); // More due to reallocation.
+ tracker.ResetCopiesMovesSwaps();
+
+ // Enlarging resize() must construct some objects
+ tracker.ResetCopiesMovesSwaps();
+ v.resize(len + 10, Instance(100));
+ EXPECT_EQ(tracker.instances(), len + 10);
+ if (len <= inlined_capacity && len + 10 > inlined_capacity) {
+ EXPECT_EQ(tracker.copies() + tracker.moves(), 10 + len);
+ } else {
+ // Only specify a minimum number of copies + moves. We don't want to
+ // depend on the reallocation policy here.
+ EXPECT_GE(tracker.copies() + tracker.moves(),
+ 10); // More due to reallocation.
+ }
+
+ // Shrinking resize() must destroy some objects
+ tracker.ResetCopiesMovesSwaps();
+ v.resize(len, Instance(100));
+ EXPECT_EQ(tracker.instances(), len);
+ EXPECT_EQ(tracker.copies(), 0);
+ EXPECT_EQ(tracker.moves(), 0);
+
+ // reserve() must not increase the number of initialized objects
+ SCOPED_TRACE("reserve");
+ v.reserve(len + 1000);
+ EXPECT_EQ(tracker.instances(), len);
+ EXPECT_EQ(tracker.copies() + tracker.moves(), len);
+
+ // pop_back() and erase() must destroy one object
+ if (len > 0) {
+ tracker.ResetCopiesMovesSwaps();
+ v.pop_back();
+ EXPECT_EQ(tracker.instances(), len - 1);
+ EXPECT_EQ(tracker.copies(), 0);
+ EXPECT_EQ(tracker.moves(), 0);
+
+ if (!v.empty()) {
+ tracker.ResetCopiesMovesSwaps();
+ v.erase(v.begin());
+ EXPECT_EQ(tracker.instances(), len - 2);
+ EXPECT_EQ(tracker.copies() + tracker.moves(), len - 2);
+ }
+ }
+
+ tracker.ResetCopiesMovesSwaps();
+ int instances_before_empty_erase = tracker.instances();
+ v.erase(v.begin(), v.begin());
+ EXPECT_EQ(tracker.instances(), instances_before_empty_erase);
+ EXPECT_EQ(tracker.copies() + tracker.moves(), 0);
+ }
+}
+
+TYPED_TEST_P(InstanceTest, CountConstructorsDestructorsOnCopyConstruction) {
+ using Instance = TypeParam;
+ using InstanceVec = absl::InlinedVector<Instance, 8>;
+ InstanceTracker tracker;
+ for (int len = 0; len < 20; len++) {
+ SCOPED_TRACE(len);
+ tracker.ResetCopiesMovesSwaps();
+
+ InstanceVec v;
+ for (int i = 0; i < len; i++) {
+ v.push_back(Instance(i));
+ }
+ EXPECT_EQ(tracker.instances(), len);
+ EXPECT_GE(tracker.copies() + tracker.moves(),
+ len); // More due to reallocation.
+ tracker.ResetCopiesMovesSwaps();
+ { // Copy constructor should create 'len' more instances.
+ InstanceVec v_copy(v);
+ EXPECT_EQ(tracker.instances(), len + len);
+ EXPECT_EQ(tracker.copies(), len);
+ EXPECT_EQ(tracker.moves(), 0);
+ }
+ EXPECT_EQ(tracker.instances(), len);
+ }
+}
+
+TYPED_TEST_P(InstanceTest, CountConstructorsDestructorsOnMoveConstruction) {
+ using Instance = TypeParam;
+ using InstanceVec = absl::InlinedVector<Instance, 8>;
+ InstanceTracker tracker;
+ for (int len = 0; len < 20; len++) {
+ SCOPED_TRACE(len);
+ tracker.ResetCopiesMovesSwaps();
+
+ InstanceVec v;
+ const size_t inlined_capacity = v.capacity();
+ for (int i = 0; i < len; i++) {
+ v.push_back(Instance(i));
+ }
+ EXPECT_EQ(tracker.instances(), len);
+ EXPECT_GE(tracker.copies() + tracker.moves(),
+ len); // More due to reallocation.
+ tracker.ResetCopiesMovesSwaps();
+ {
+ InstanceVec v_copy(std::move(v));
+ if (len > inlined_capacity) {
+ // Allocation is moved as a whole.
+ EXPECT_EQ(tracker.instances(), len);
+ EXPECT_EQ(tracker.live_instances(), len);
+ // Tests an implementation detail, don't rely on this in your code.
+ EXPECT_EQ(v.size(), 0); // NOLINT misc-use-after-move
+ EXPECT_EQ(tracker.copies(), 0);
+ EXPECT_EQ(tracker.moves(), 0);
+ } else {
+ EXPECT_EQ(tracker.instances(), len + len);
+ if (Instance::supports_move()) {
+ EXPECT_EQ(tracker.live_instances(), len);
+ EXPECT_EQ(tracker.copies(), 0);
+ EXPECT_EQ(tracker.moves(), len);
+ } else {
+ EXPECT_EQ(tracker.live_instances(), len + len);
+ EXPECT_EQ(tracker.copies(), len);
+ EXPECT_EQ(tracker.moves(), 0);
+ }
+ }
+ EXPECT_EQ(tracker.swaps(), 0);
+ }
+ }
+}
+
+TYPED_TEST_P(InstanceTest, CountConstructorsDestructorsOnAssignment) {
+ using Instance = TypeParam;
+ using InstanceVec = absl::InlinedVector<Instance, 8>;
+ InstanceTracker tracker;
+ for (int len = 0; len < 20; len++) {
+ SCOPED_TRACE(len);
+ for (int longorshort = 0; longorshort <= 1; ++longorshort) {
+ SCOPED_TRACE(longorshort);
+ tracker.ResetCopiesMovesSwaps();
+
+ InstanceVec longer, shorter;
+ for (int i = 0; i < len; i++) {
+ longer.push_back(Instance(i));
+ shorter.push_back(Instance(i));
+ }
+ longer.push_back(Instance(len));
+ EXPECT_EQ(tracker.instances(), len + len + 1);
+ EXPECT_GE(tracker.copies() + tracker.moves(),
+ len + len + 1); // More due to reallocation.
+
+ tracker.ResetCopiesMovesSwaps();
+ if (longorshort) {
+ shorter = longer;
+ EXPECT_EQ(tracker.instances(), (len + 1) + (len + 1));
+ EXPECT_GE(tracker.copies() + tracker.moves(),
+ len + 1); // More due to reallocation.
+ } else {
+ longer = shorter;
+ EXPECT_EQ(tracker.instances(), len + len);
+ EXPECT_EQ(tracker.copies() + tracker.moves(), len);
+ }
+ }
+ }
+}
+
+TYPED_TEST_P(InstanceTest, CountConstructorsDestructorsOnMoveAssignment) {
+ using Instance = TypeParam;
+ using InstanceVec = absl::InlinedVector<Instance, 8>;
+ InstanceTracker tracker;
+ for (int len = 0; len < 20; len++) {
+ SCOPED_TRACE(len);
+ for (int longorshort = 0; longorshort <= 1; ++longorshort) {
+ SCOPED_TRACE(longorshort);
+ tracker.ResetCopiesMovesSwaps();
+
+ InstanceVec longer, shorter;
+ const int inlined_capacity = longer.capacity();
+ for (int i = 0; i < len; i++) {
+ longer.push_back(Instance(i));
+ shorter.push_back(Instance(i));
+ }
+ longer.push_back(Instance(len));
+ EXPECT_EQ(tracker.instances(), len + len + 1);
+ EXPECT_GE(tracker.copies() + tracker.moves(),
+ len + len + 1); // More due to reallocation.
+
+ tracker.ResetCopiesMovesSwaps();
+ int src_len;
+ if (longorshort) {
+ src_len = len + 1;
+ shorter = std::move(longer);
+ } else {
+ src_len = len;
+ longer = std::move(shorter);
+ }
+ if (src_len > inlined_capacity) {
+ // Allocation moved as a whole.
+ EXPECT_EQ(tracker.instances(), src_len);
+ EXPECT_EQ(tracker.live_instances(), src_len);
+ EXPECT_EQ(tracker.copies(), 0);
+ EXPECT_EQ(tracker.moves(), 0);
+ } else {
+ // Elements are all copied.
+ EXPECT_EQ(tracker.instances(), src_len + src_len);
+ if (Instance::supports_move()) {
+ EXPECT_EQ(tracker.copies(), 0);
+ EXPECT_EQ(tracker.moves(), src_len);
+ EXPECT_EQ(tracker.live_instances(), src_len);
+ } else {
+ EXPECT_EQ(tracker.copies(), src_len);
+ EXPECT_EQ(tracker.moves(), 0);
+ EXPECT_EQ(tracker.live_instances(), src_len + src_len);
+ }
+ }
+ EXPECT_EQ(tracker.swaps(), 0);
+ }
+ }
+}
+
+TEST(CountElemAssign, SimpleTypeWithInlineBacking) {
+ for (size_t original_size = 0; original_size <= 5; ++original_size) {
+ SCOPED_TRACE(original_size);
+ // Original contents are [12345, 12345, ...]
+ std::vector<int> original_contents(original_size, 12345);
+
+ absl::InlinedVector<int, 2> v(original_contents.begin(),
+ original_contents.end());
+ v.assign(2, 123);
+ EXPECT_THAT(v, AllOf(SizeIs(2), ElementsAre(123, 123)));
+ if (original_size <= 2) {
+ // If the original had inline backing, it should stay inline.
+ EXPECT_EQ(2, v.capacity());
+ }
+ }
+}
+
+TEST(CountElemAssign, SimpleTypeWithAllocation) {
+ for (size_t original_size = 0; original_size <= 5; ++original_size) {
+ SCOPED_TRACE(original_size);
+ // Original contents are [12345, 12345, ...]
+ std::vector<int> original_contents(original_size, 12345);
+
+ absl::InlinedVector<int, 2> v(original_contents.begin(),
+ original_contents.end());
+ v.assign(3, 123);
+ EXPECT_THAT(v, AllOf(SizeIs(3), ElementsAre(123, 123, 123)));
+ EXPECT_LE(v.size(), v.capacity());
+ }
+}
+
+TYPED_TEST_P(InstanceTest, CountElemAssignInlineBacking) {
+ using Instance = TypeParam;
+ for (size_t original_size = 0; original_size <= 5; ++original_size) {
+ SCOPED_TRACE(original_size);
+ // Original contents are [12345, 12345, ...]
+ std::vector<Instance> original_contents(original_size, Instance(12345));
+
+ absl::InlinedVector<Instance, 2> v(original_contents.begin(),
+ original_contents.end());
+ v.assign(2, Instance(123));
+ EXPECT_THAT(v, AllOf(SizeIs(2), ElementsAre(ValueIs(123), ValueIs(123))));
+ if (original_size <= 2) {
+ // If the original had inline backing, it should stay inline.
+ EXPECT_EQ(2, v.capacity());
+ }
+ }
+}
+
+template <typename Instance>
+void InstanceCountElemAssignWithAllocationTest() {
+ for (size_t original_size = 0; original_size <= 5; ++original_size) {
+ SCOPED_TRACE(original_size);
+ // Original contents are [12345, 12345, ...]
+ std::vector<Instance> original_contents(original_size, Instance(12345));
+
+ absl::InlinedVector<Instance, 2> v(original_contents.begin(),
+ original_contents.end());
+ v.assign(3, Instance(123));
+ EXPECT_THAT(v, AllOf(SizeIs(3), ElementsAre(ValueIs(123), ValueIs(123),
+ ValueIs(123))));
+ EXPECT_LE(v.size(), v.capacity());
+ }
+}
+TEST(CountElemAssign, WithAllocationCopyableInstance) {
+ InstanceCountElemAssignWithAllocationTest<CopyableOnlyInstance>();
+}
+TEST(CountElemAssign, WithAllocationCopyableMovableInstance) {
+ InstanceCountElemAssignWithAllocationTest<CopyableMovableInstance>();
+}
+
+TEST(RangedConstructor, SimpleType) {
+ std::vector<int> source_v = {4, 5, 6};
+ // First try to fit in inline backing
+ absl::InlinedVector<int, 4> v(source_v.begin(), source_v.end());
+ EXPECT_EQ(3, v.size());
+ EXPECT_EQ(4, v.capacity()); // Indication that we're still on inlined storage
+ EXPECT_EQ(4, v[0]);
+ EXPECT_EQ(5, v[1]);
+ EXPECT_EQ(6, v[2]);
+
+ // Now, force a re-allocate
+ absl::InlinedVector<int, 2> realloc_v(source_v.begin(), source_v.end());
+ EXPECT_EQ(3, realloc_v.size());
+ EXPECT_LT(2, realloc_v.capacity());
+ EXPECT_EQ(4, realloc_v[0]);
+ EXPECT_EQ(5, realloc_v[1]);
+ EXPECT_EQ(6, realloc_v[2]);
+}
+
+// Test for ranged constructors using Instance as the element type and
+// SourceContainer as the source container type.
+template <typename Instance, typename SourceContainer, int inlined_capacity>
+void InstanceRangedConstructorTestForContainer() {
+ InstanceTracker tracker;
+ SourceContainer source_v = {Instance(0), Instance(1)};
+ tracker.ResetCopiesMovesSwaps();
+ absl::InlinedVector<Instance, inlined_capacity> v(source_v.begin(),
+ source_v.end());
+ EXPECT_EQ(2, v.size());
+ EXPECT_LT(1, v.capacity());
+ EXPECT_EQ(0, v[0].value());
+ EXPECT_EQ(1, v[1].value());
+ EXPECT_EQ(tracker.copies(), 2);
+ EXPECT_EQ(tracker.moves(), 0);
+}
+
+template <typename Instance, int inlined_capacity>
+void InstanceRangedConstructorTestWithCapacity() {
+ // Test with const and non-const, random access and non-random-access sources.
+ // TODO(bsamwel): Test with an input iterator source.
+ {
+ SCOPED_TRACE("std::list");
+ InstanceRangedConstructorTestForContainer<Instance, std::list<Instance>,
+ inlined_capacity>();
+ {
+ SCOPED_TRACE("const std::list");
+ InstanceRangedConstructorTestForContainer<
+ Instance, const std::list<Instance>, inlined_capacity>();
+ }
+ {
+ SCOPED_TRACE("std::vector");
+ InstanceRangedConstructorTestForContainer<Instance, std::vector<Instance>,
+ inlined_capacity>();
+ }
+ {
+ SCOPED_TRACE("const std::vector");
+ InstanceRangedConstructorTestForContainer<
+ Instance, const std::vector<Instance>, inlined_capacity>();
+ }
+ }
+}
+
+TYPED_TEST_P(InstanceTest, RangedConstructor) {
+ using Instance = TypeParam;
+ SCOPED_TRACE("capacity=1");
+ InstanceRangedConstructorTestWithCapacity<Instance, 1>();
+ SCOPED_TRACE("capacity=2");
+ InstanceRangedConstructorTestWithCapacity<Instance, 2>();
+}
+
+TEST(RangedConstructor, ElementsAreConstructed) {
+ std::vector<std::string> source_v = {"cat", "dog"};
+
+ // Force expansion and re-allocation of v. Ensures that when the vector is
+ // expanded that new elements are constructed.
+ absl::InlinedVector<std::string, 1> v(source_v.begin(), source_v.end());
+ EXPECT_EQ("cat", v[0]);
+ EXPECT_EQ("dog", v[1]);
+}
+
+TEST(RangedAssign, SimpleType) {
+ // Test for all combinations of original sizes (empty and non-empty inline,
+ // and out of line) and target sizes.
+ for (size_t original_size = 0; original_size <= 5; ++original_size) {
+ SCOPED_TRACE(original_size);
+ // Original contents are [12345, 12345, ...]
+ std::vector<int> original_contents(original_size, 12345);
+
+ for (size_t target_size = 0; target_size <= 5; ++target_size) {
+ SCOPED_TRACE(target_size);
+
+ // New contents are [3, 4, ...]
+ std::vector<int> new_contents;
+ for (size_t i = 0; i < target_size; ++i) {
+ new_contents.push_back(i + 3);
+ }
+
+ absl::InlinedVector<int, 3> v(original_contents.begin(),
+ original_contents.end());
+ v.assign(new_contents.begin(), new_contents.end());
+
+ EXPECT_EQ(new_contents.size(), v.size());
+ EXPECT_LE(new_contents.size(), v.capacity());
+ if (target_size <= 3 && original_size <= 3) {
+ // Storage should stay inline when target size is small.
+ EXPECT_EQ(3, v.capacity());
+ }
+ EXPECT_THAT(v, ElementsAreArray(new_contents));
+ }
+ }
+}
+
+// Returns true if lhs and rhs have the same value.
+template <typename Instance>
+static bool InstanceValuesEqual(const Instance& lhs, const Instance& rhs) {
+ return lhs.value() == rhs.value();
+}
+
+// Test for ranged assign() using Instance as the element type and
+// SourceContainer as the source container type.
+template <typename Instance, typename SourceContainer>
+void InstanceRangedAssignTestForContainer() {
+ // Test for all combinations of original sizes (empty and non-empty inline,
+ // and out of line) and target sizes.
+ for (size_t original_size = 0; original_size <= 5; ++original_size) {
+ SCOPED_TRACE(original_size);
+ // Original contents are [12345, 12345, ...]
+ std::vector<Instance> original_contents(original_size, Instance(12345));
+
+ for (size_t target_size = 0; target_size <= 5; ++target_size) {
+ SCOPED_TRACE(target_size);
+
+ // New contents are [3, 4, ...]
+ // Generate data using a non-const container, because SourceContainer
+ // itself may be const.
+ // TODO(bsamwel): Test with an input iterator.
+ std::vector<Instance> new_contents_in;
+ for (size_t i = 0; i < target_size; ++i) {
+ new_contents_in.push_back(Instance(i + 3));
+ }
+ SourceContainer new_contents(new_contents_in.begin(),
+ new_contents_in.end());
+
+ absl::InlinedVector<Instance, 3> v(original_contents.begin(),
+ original_contents.end());
+ v.assign(new_contents.begin(), new_contents.end());
+
+ EXPECT_EQ(new_contents.size(), v.size());
+ EXPECT_LE(new_contents.size(), v.capacity());
+ if (target_size <= 3 && original_size <= 3) {
+ // Storage should stay inline when target size is small.
+ EXPECT_EQ(3, v.capacity());
+ }
+ EXPECT_TRUE(std::equal(v.begin(), v.end(), new_contents.begin(),
+ InstanceValuesEqual<Instance>));
+ }
+ }
+}
+
+TYPED_TEST_P(InstanceTest, RangedAssign) {
+ using Instance = TypeParam;
+ // Test with const and non-const, random access and non-random-access sources.
+ // TODO(bsamwel): Test with an input iterator source.
+ SCOPED_TRACE("std::list");
+ InstanceRangedAssignTestForContainer<Instance, std::list<Instance>>();
+ SCOPED_TRACE("const std::list");
+ InstanceRangedAssignTestForContainer<Instance, const std::list<Instance>>();
+ SCOPED_TRACE("std::vector");
+ InstanceRangedAssignTestForContainer<Instance, std::vector<Instance>>();
+ SCOPED_TRACE("const std::vector");
+ InstanceRangedAssignTestForContainer<Instance, const std::vector<Instance>>();
+}
+
+TEST(InitializerListConstructor, SimpleTypeWithInlineBacking) {
+ EXPECT_THAT((absl::InlinedVector<int, 4>{4, 5, 6}),
+ AllOf(SizeIs(3), CapacityIs(4), ElementsAre(4, 5, 6)));
+}
+
+TEST(InitializerListConstructor, SimpleTypeWithReallocationRequired) {
+ EXPECT_THAT((absl::InlinedVector<int, 2>{4, 5, 6}),
+ AllOf(SizeIs(3), CapacityIs(Gt(2)), ElementsAre(4, 5, 6)));
+}
+
+TEST(InitializerListConstructor, DisparateTypesInList) {
+ EXPECT_THAT((absl::InlinedVector<int, 2>{-7, 8ULL}), ElementsAre(-7, 8));
+
+ EXPECT_THAT((absl::InlinedVector<std::string, 2>{"foo", std::string("bar")}),
+ ElementsAre("foo", "bar"));
+}
+
+TEST(InitializerListConstructor, ComplexTypeWithInlineBacking) {
+ EXPECT_THAT((absl::InlinedVector<CopyableMovableInstance, 1>{
+ CopyableMovableInstance(0)}),
+ AllOf(SizeIs(1), CapacityIs(1), ElementsAre(ValueIs(0))));
+}
+
+TEST(InitializerListConstructor, ComplexTypeWithReallocationRequired) {
+ EXPECT_THAT(
+ (absl::InlinedVector<CopyableMovableInstance, 1>{
+ CopyableMovableInstance(0), CopyableMovableInstance(1)}),
+ AllOf(SizeIs(2), CapacityIs(Gt(1)), ElementsAre(ValueIs(0), ValueIs(1))));
+}
+
+TEST(InitializerListAssign, SimpleTypeFitsInlineBacking) {
+ for (size_t original_size = 0; original_size <= 4; ++original_size) {
+ SCOPED_TRACE(original_size);
+
+ absl::InlinedVector<int, 2> v1(original_size, 12345);
+ const size_t original_capacity_v1 = v1.capacity();
+ v1.assign({3});
+ EXPECT_THAT(
+ v1, AllOf(SizeIs(1), CapacityIs(original_capacity_v1), ElementsAre(3)));
+
+ absl::InlinedVector<int, 2> v2(original_size, 12345);
+ const size_t original_capacity_v2 = v2.capacity();
+ v2 = {3};
+ EXPECT_THAT(
+ v2, AllOf(SizeIs(1), CapacityIs(original_capacity_v2), ElementsAre(3)));
+ }
+}
+
+TEST(InitializerListAssign, SimpleTypeDoesNotFitInlineBacking) {
+ for (size_t original_size = 0; original_size <= 4; ++original_size) {
+ SCOPED_TRACE(original_size);
+ absl::InlinedVector<int, 2> v1(original_size, 12345);
+ v1.assign({3, 4, 5});
+ EXPECT_THAT(v1, AllOf(SizeIs(3), ElementsAre(3, 4, 5)));
+ EXPECT_LE(3, v1.capacity());
+
+ absl::InlinedVector<int, 2> v2(original_size, 12345);
+ v2 = {3, 4, 5};
+ EXPECT_THAT(v2, AllOf(SizeIs(3), ElementsAre(3, 4, 5)));
+ EXPECT_LE(3, v2.capacity());
+ }
+}
+
+TEST(InitializerListAssign, DisparateTypesInList) {
+ absl::InlinedVector<int, 2> v_int1;
+ v_int1.assign({-7, 8ULL});
+ EXPECT_THAT(v_int1, ElementsAre(-7, 8));
+
+ absl::InlinedVector<int, 2> v_int2;
+ v_int2 = {-7, 8ULL};
+ EXPECT_THAT(v_int2, ElementsAre(-7, 8));
+
+ absl::InlinedVector<std::string, 2> v_string1;
+ v_string1.assign({"foo", std::string("bar")});
+ EXPECT_THAT(v_string1, ElementsAre("foo", "bar"));
+
+ absl::InlinedVector<std::string, 2> v_string2;
+ v_string2 = {"foo", std::string("bar")};
+ EXPECT_THAT(v_string2, ElementsAre("foo", "bar"));
+}
+
+TYPED_TEST_P(InstanceTest, InitializerListAssign) {
+ using Instance = TypeParam;
+ for (size_t original_size = 0; original_size <= 4; ++original_size) {
+ SCOPED_TRACE(original_size);
+ absl::InlinedVector<Instance, 2> v(original_size, Instance(12345));
+ const size_t original_capacity = v.capacity();
+ v.assign({Instance(3)});
+ EXPECT_THAT(v, AllOf(SizeIs(1), CapacityIs(original_capacity),
+ ElementsAre(ValueIs(3))));
+ }
+ for (size_t original_size = 0; original_size <= 4; ++original_size) {
+ SCOPED_TRACE(original_size);
+ absl::InlinedVector<Instance, 2> v(original_size, Instance(12345));
+ v.assign({Instance(3), Instance(4), Instance(5)});
+ EXPECT_THAT(
+ v, AllOf(SizeIs(3), ElementsAre(ValueIs(3), ValueIs(4), ValueIs(5))));
+ EXPECT_LE(3, v.capacity());
+ }
+}
+
+REGISTER_TYPED_TEST_CASE_P(InstanceTest, Swap, CountConstructorsDestructors,
+ CountConstructorsDestructorsOnCopyConstruction,
+ CountConstructorsDestructorsOnMoveConstruction,
+ CountConstructorsDestructorsOnAssignment,
+ CountConstructorsDestructorsOnMoveAssignment,
+ CountElemAssignInlineBacking, RangedConstructor,
+ RangedAssign, InitializerListAssign);
+
+using InstanceTypes =
+ ::testing::Types<CopyableOnlyInstance, CopyableMovableInstance>;
+INSTANTIATE_TYPED_TEST_CASE_P(InstanceTestOnTypes, InstanceTest, InstanceTypes);
+
+TEST(DynamicVec, DynamicVecCompiles) {
+ DynamicVec v;
+ (void)v;
+}
+
+TEST(AllocatorSupportTest, Constructors) {
+ using MyAlloc = CountingAllocator<int>;
+ using AllocVec = absl::InlinedVector<int, 4, MyAlloc>;
+ const int ia[] = {0, 1, 2, 3, 4, 5, 6, 7};
+ int64_t allocated = 0;
+ MyAlloc alloc(&allocated);
+ { AllocVec ABSL_ATTRIBUTE_UNUSED v; }
+ { AllocVec ABSL_ATTRIBUTE_UNUSED v(alloc); }
+ { AllocVec ABSL_ATTRIBUTE_UNUSED v(ia, ia + ABSL_ARRAYSIZE(ia), alloc); }
+ { AllocVec ABSL_ATTRIBUTE_UNUSED v({1, 2, 3}, alloc); }
+
+ AllocVec v2;
+ { AllocVec ABSL_ATTRIBUTE_UNUSED v(v2, alloc); }
+ { AllocVec ABSL_ATTRIBUTE_UNUSED v(std::move(v2), alloc); }
+}
+
+TEST(AllocatorSupportTest, CountAllocations) {
+ using MyAlloc = CountingAllocator<int>;
+ using AllocVec = absl::InlinedVector<int, 4, MyAlloc>;
+ const int ia[] = {0, 1, 2, 3, 4, 5, 6, 7};
+ int64_t allocated = 0;
+ MyAlloc alloc(&allocated);
+ {
+ AllocVec ABSL_ATTRIBUTE_UNUSED v(ia, ia + 4, alloc);
+ EXPECT_THAT(allocated, 0);
+ }
+ EXPECT_THAT(allocated, 0);
+ {
+ AllocVec ABSL_ATTRIBUTE_UNUSED v(ia, ia + ABSL_ARRAYSIZE(ia), alloc);
+ EXPECT_THAT(allocated, v.size() * sizeof(int));
+ }
+ EXPECT_THAT(allocated, 0);
+ {
+ AllocVec v(4, 1, alloc);
+ EXPECT_THAT(allocated, 0);
+
+ int64_t allocated2 = 0;
+ MyAlloc alloc2(&allocated2);
+ AllocVec v2(v, alloc2);
+ EXPECT_THAT(allocated2, 0);
+
+ int64_t allocated3 = 0;
+ MyAlloc alloc3(&allocated3);
+ AllocVec v3(std::move(v), alloc3);
+ EXPECT_THAT(allocated3, 0);
+ }
+ EXPECT_THAT(allocated, 0);
+ {
+ AllocVec v(8, 2, alloc);
+ EXPECT_THAT(allocated, v.size() * sizeof(int));
+
+ int64_t allocated2 = 0;
+ MyAlloc alloc2(&allocated2);
+ AllocVec v2(v, alloc2);
+ EXPECT_THAT(allocated2, v2.size() * sizeof(int));
+
+ int64_t allocated3 = 0;
+ MyAlloc alloc3(&allocated3);
+ AllocVec v3(std::move(v), alloc3);
+ EXPECT_THAT(allocated3, v3.size() * sizeof(int));
+ }
+ EXPECT_EQ(allocated, 0);
+ {
+ // Test shrink_to_fit deallocations.
+ AllocVec v(8, 2, alloc);
+ EXPECT_EQ(allocated, 8 * sizeof(int));
+ v.resize(5);
+ EXPECT_EQ(allocated, 8 * sizeof(int));
+ v.shrink_to_fit();
+ EXPECT_EQ(allocated, 5 * sizeof(int));
+ v.resize(4);
+ EXPECT_EQ(allocated, 5 * sizeof(int));
+ v.shrink_to_fit();
+ EXPECT_EQ(allocated, 0);
+ }
+}
+
+TEST(AllocatorSupportTest, SwapBothAllocated) {
+ using MyAlloc = CountingAllocator<int>;
+ using AllocVec = absl::InlinedVector<int, 4, MyAlloc>;
+ int64_t allocated1 = 0;
+ int64_t allocated2 = 0;
+ {
+ const int ia1[] = {0, 1, 2, 3, 4, 5, 6, 7};
+ const int ia2[] = {0, 1, 2, 3, 4, 5, 6, 7, 8};
+ MyAlloc a1(&allocated1);
+ MyAlloc a2(&allocated2);
+ AllocVec v1(ia1, ia1 + ABSL_ARRAYSIZE(ia1), a1);
+ AllocVec v2(ia2, ia2 + ABSL_ARRAYSIZE(ia2), a2);
+ EXPECT_LT(v1.capacity(), v2.capacity());
+ EXPECT_THAT(allocated1, v1.capacity() * sizeof(int));
+ EXPECT_THAT(allocated2, v2.capacity() * sizeof(int));
+ v1.swap(v2);
+ EXPECT_THAT(v1, ElementsAreArray(ia2));
+ EXPECT_THAT(v2, ElementsAreArray(ia1));
+ EXPECT_THAT(allocated1, v2.capacity() * sizeof(int));
+ EXPECT_THAT(allocated2, v1.capacity() * sizeof(int));
+ }
+ EXPECT_THAT(allocated1, 0);
+ EXPECT_THAT(allocated2, 0);
+}
+
+TEST(AllocatorSupportTest, SwapOneAllocated) {
+ using MyAlloc = CountingAllocator<int>;
+ using AllocVec = absl::InlinedVector<int, 4, MyAlloc>;
+ int64_t allocated1 = 0;
+ int64_t allocated2 = 0;
+ {
+ const int ia1[] = {0, 1, 2, 3, 4, 5, 6, 7};
+ const int ia2[] = {0, 1, 2, 3};
+ MyAlloc a1(&allocated1);
+ MyAlloc a2(&allocated2);
+ AllocVec v1(ia1, ia1 + ABSL_ARRAYSIZE(ia1), a1);
+ AllocVec v2(ia2, ia2 + ABSL_ARRAYSIZE(ia2), a2);
+ EXPECT_THAT(allocated1, v1.capacity() * sizeof(int));
+ EXPECT_THAT(allocated2, 0);
+ v1.swap(v2);
+ EXPECT_THAT(v1, ElementsAreArray(ia2));
+ EXPECT_THAT(v2, ElementsAreArray(ia1));
+ EXPECT_THAT(allocated1, v2.capacity() * sizeof(int));
+ EXPECT_THAT(allocated2, 0);
+ EXPECT_TRUE(v2.get_allocator() == a1);
+ EXPECT_TRUE(v1.get_allocator() == a2);
+ }
+ EXPECT_THAT(allocated1, 0);
+ EXPECT_THAT(allocated2, 0);
+}
+
+TEST(AllocatorSupportTest, ScopedAllocatorWorksInlined) {
+ using StdVector = std::vector<int, CountingAllocator<int>>;
+ using Alloc = CountingAllocator<StdVector>;
+ using ScopedAlloc = std::scoped_allocator_adaptor<Alloc>;
+ using AllocVec = absl::InlinedVector<StdVector, 1, ScopedAlloc>;
+
+ int64_t total_allocated_byte_count = 0;
+
+ AllocVec inlined_case(ScopedAlloc(Alloc(+&total_allocated_byte_count)));
+
+ // Called only once to remain inlined
+ inlined_case.emplace_back();
+
+ int64_t absl_responsible_for_count = total_allocated_byte_count;
+
+ // MSVC's allocator preemptively allocates in debug mode
+#if !defined(_MSC_VER)
+ EXPECT_EQ(absl_responsible_for_count, 0);
+#endif // !defined(_MSC_VER)
+
+ inlined_case[0].emplace_back();
+ EXPECT_GT(total_allocated_byte_count, absl_responsible_for_count);
+
+ inlined_case.clear();
+ inlined_case.shrink_to_fit();
+ EXPECT_EQ(total_allocated_byte_count, 0);
+}
+
+TEST(AllocatorSupportTest, ScopedAllocatorWorksAllocated) {
+ using StdVector = std::vector<int, CountingAllocator<int>>;
+ using Alloc = CountingAllocator<StdVector>;
+ using ScopedAlloc = std::scoped_allocator_adaptor<Alloc>;
+ using AllocVec = absl::InlinedVector<StdVector, 1, ScopedAlloc>;
+
+ int64_t total_allocated_byte_count = 0;
+
+ AllocVec allocated_case(ScopedAlloc(Alloc(+&total_allocated_byte_count)));
+
+ // Called twice to force into being allocated
+ allocated_case.emplace_back();
+ allocated_case.emplace_back();
+
+ int64_t absl_responsible_for_count = total_allocated_byte_count;
+ EXPECT_GT(absl_responsible_for_count, 0);
+
+ allocated_case[1].emplace_back();
+ EXPECT_GT(total_allocated_byte_count, absl_responsible_for_count);
+
+ allocated_case.clear();
+ allocated_case.shrink_to_fit();
+ EXPECT_EQ(total_allocated_byte_count, 0);
+}
+
+TEST(AllocatorSupportTest, SizeAllocConstructor) {
+ constexpr int inlined_size = 4;
+ using Alloc = CountingAllocator<int>;
+ using AllocVec = absl::InlinedVector<int, inlined_size, Alloc>;
+
+ {
+ auto len = inlined_size / 2;
+ int64_t allocated = 0;
+ auto v = AllocVec(len, Alloc(&allocated));
+
+ // Inline storage used; allocator should not be invoked
+ EXPECT_THAT(allocated, 0);
+ EXPECT_THAT(v, AllOf(SizeIs(len), Each(0)));
+ }
+
+ {
+ auto len = inlined_size * 2;
+ int64_t allocated = 0;
+ auto v = AllocVec(len, Alloc(&allocated));
+
+ // Out of line storage used; allocation of 8 elements expected
+ EXPECT_THAT(allocated, len * sizeof(int));
+ EXPECT_THAT(v, AllOf(SizeIs(len), Each(0)));
+ }
+}
+
+TEST(InlinedVectorTest, MinimumAllocatorCompilesUsingTraits) {
+ using T = int;
+ using A = std::allocator<T>;
+ using ATraits = absl::allocator_traits<A>;
+
+ struct MinimumAllocator {
+ using value_type = T;
+
+ value_type* allocate(size_t n) {
+ A a;
+ return ATraits::allocate(a, n);
+ }
+
+ void deallocate(value_type* p, size_t n) {
+ A a;
+ ATraits::deallocate(a, p, n);
+ }
+ };
+
+ absl::InlinedVector<T, 1, MinimumAllocator> vec;
+ vec.emplace_back();
+ vec.resize(0);
+}
+
+TEST(InlinedVectorTest, AbslHashValueWorks) {
+ using V = absl::InlinedVector<int, 4>;
+ std::vector<V> cases;
+
+ // Generate a variety of vectors some of these are small enough for the inline
+ // space but are stored out of line.
+ for (int i = 0; i < 10; ++i) {
+ V v;
+ for (int j = 0; j < i; ++j) {
+ v.push_back(j);
+ }
+ cases.push_back(v);
+ v.resize(i % 4);
+ cases.push_back(v);
+ }
+
+ EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(cases));
+}
+
+} // anonymous namespace
diff --git a/third_party/abseil/src/absl/container/internal/btree.h b/third_party/abseil/src/absl/container/internal/btree.h
new file mode 100644
index 0000000..f2fc31d
--- /dev/null
+++ b/third_party/abseil/src/absl/container/internal/btree.h
@@ -0,0 +1,2587 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// A btree implementation of the STL set and map interfaces. A btree is smaller
+// and generally also faster than STL set/map (refer to the benchmarks below).
+// The red-black tree implementation of STL set/map has an overhead of 3
+// pointers (left, right and parent) plus the node color information for each
+// stored value. So a set<int32_t> consumes 40 bytes for each value stored in
+// 64-bit mode. This btree implementation stores multiple values on fixed
+// size nodes (usually 256 bytes) and doesn't store child pointers for leaf
+// nodes. The result is that a btree_set<int32_t> may use much less memory per
+// stored value. For the random insertion benchmark in btree_bench.cc, a
+// btree_set<int32_t> with node-size of 256 uses 5.1 bytes per stored value.
+//
+// The packing of multiple values on to each node of a btree has another effect
+// besides better space utilization: better cache locality due to fewer cache
+// lines being accessed. Better cache locality translates into faster
+// operations.
+//
+// CAVEATS
+//
+// Insertions and deletions on a btree can cause splitting, merging or
+// rebalancing of btree nodes. And even without these operations, insertions
+// and deletions on a btree will move values around within a node. In both
+// cases, the result is that insertions and deletions can invalidate iterators
+// pointing to values other than the one being inserted/deleted. Therefore, this
+// container does not provide pointer stability. This is notably different from
+// STL set/map which takes care to not invalidate iterators on insert/erase
+// except, of course, for iterators pointing to the value being erased. A
+// partial workaround when erasing is available: erase() returns an iterator
+// pointing to the item just after the one that was erased (or end() if none
+// exists).
+
+#ifndef ABSL_CONTAINER_INTERNAL_BTREE_H_
+#define ABSL_CONTAINER_INTERNAL_BTREE_H_
+
+#include <algorithm>
+#include <cassert>
+#include <cstddef>
+#include <cstdint>
+#include <cstring>
+#include <functional>
+#include <iterator>
+#include <limits>
+#include <new>
+#include <string>
+#include <type_traits>
+#include <utility>
+
+#include "absl/base/macros.h"
+#include "absl/container/internal/common.h"
+#include "absl/container/internal/compressed_tuple.h"
+#include "absl/container/internal/container_memory.h"
+#include "absl/container/internal/layout.h"
+#include "absl/memory/memory.h"
+#include "absl/meta/type_traits.h"
+#include "absl/strings/cord.h"
+#include "absl/strings/string_view.h"
+#include "absl/types/compare.h"
+#include "absl/utility/utility.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace container_internal {
+
+// A helper class that indicates if the Compare parameter is a key-compare-to
+// comparator.
+template <typename Compare, typename T>
+using btree_is_key_compare_to =
+ std::is_convertible<absl::result_of_t<Compare(const T &, const T &)>,
+ absl::weak_ordering>;
+
+struct StringBtreeDefaultLess {
+ using is_transparent = void;
+
+ StringBtreeDefaultLess() = default;
+
+ // Compatibility constructor.
+ StringBtreeDefaultLess(std::less<std::string>) {} // NOLINT
+ StringBtreeDefaultLess(std::less<string_view>) {} // NOLINT
+
+ absl::weak_ordering operator()(absl::string_view lhs,
+ absl::string_view rhs) const {
+ return compare_internal::compare_result_as_ordering(lhs.compare(rhs));
+ }
+ StringBtreeDefaultLess(std::less<absl::Cord>) {} // NOLINT
+ absl::weak_ordering operator()(const absl::Cord &lhs,
+ const absl::Cord &rhs) const {
+ return compare_internal::compare_result_as_ordering(lhs.Compare(rhs));
+ }
+ absl::weak_ordering operator()(const absl::Cord &lhs,
+ absl::string_view rhs) const {
+ return compare_internal::compare_result_as_ordering(lhs.Compare(rhs));
+ }
+ absl::weak_ordering operator()(absl::string_view lhs,
+ const absl::Cord &rhs) const {
+ return compare_internal::compare_result_as_ordering(-rhs.Compare(lhs));
+ }
+};
+
+struct StringBtreeDefaultGreater {
+ using is_transparent = void;
+
+ StringBtreeDefaultGreater() = default;
+
+ StringBtreeDefaultGreater(std::greater<std::string>) {} // NOLINT
+ StringBtreeDefaultGreater(std::greater<string_view>) {} // NOLINT
+
+ absl::weak_ordering operator()(absl::string_view lhs,
+ absl::string_view rhs) const {
+ return compare_internal::compare_result_as_ordering(rhs.compare(lhs));
+ }
+ StringBtreeDefaultGreater(std::greater<absl::Cord>) {} // NOLINT
+ absl::weak_ordering operator()(const absl::Cord &lhs,
+ const absl::Cord &rhs) const {
+ return compare_internal::compare_result_as_ordering(rhs.Compare(lhs));
+ }
+ absl::weak_ordering operator()(const absl::Cord &lhs,
+ absl::string_view rhs) const {
+ return compare_internal::compare_result_as_ordering(-lhs.Compare(rhs));
+ }
+ absl::weak_ordering operator()(absl::string_view lhs,
+ const absl::Cord &rhs) const {
+ return compare_internal::compare_result_as_ordering(rhs.Compare(lhs));
+ }
+};
+
+// A helper class to convert a boolean comparison into a three-way "compare-to"
+// comparison that returns an `absl::weak_ordering`. This helper
+// class is specialized for less<std::string>, greater<std::string>,
+// less<string_view>, greater<string_view>, less<absl::Cord>, and
+// greater<absl::Cord>.
+//
+// key_compare_to_adapter is provided so that btree users
+// automatically get the more efficient compare-to code when using common
+// Abseil string types with common comparison functors.
+// These string-like specializations also turn on heterogeneous lookup by
+// default.
+template <typename Compare>
+struct key_compare_to_adapter {
+ using type = Compare;
+};
+
+template <>
+struct key_compare_to_adapter<std::less<std::string>> {
+ using type = StringBtreeDefaultLess;
+};
+
+template <>
+struct key_compare_to_adapter<std::greater<std::string>> {
+ using type = StringBtreeDefaultGreater;
+};
+
+template <>
+struct key_compare_to_adapter<std::less<absl::string_view>> {
+ using type = StringBtreeDefaultLess;
+};
+
+template <>
+struct key_compare_to_adapter<std::greater<absl::string_view>> {
+ using type = StringBtreeDefaultGreater;
+};
+
+template <>
+struct key_compare_to_adapter<std::less<absl::Cord>> {
+ using type = StringBtreeDefaultLess;
+};
+
+template <>
+struct key_compare_to_adapter<std::greater<absl::Cord>> {
+ using type = StringBtreeDefaultGreater;
+};
+
+// Detects an 'absl_btree_prefer_linear_node_search' member. This is
+// a protocol used as an opt-in or opt-out of linear search.
+//
+// For example, this would be useful for key types that wrap an integer
+// and define their own cheap operator<(). For example:
+//
+// class K {
+// public:
+// using absl_btree_prefer_linear_node_search = std::true_type;
+// ...
+// private:
+// friend bool operator<(K a, K b) { return a.k_ < b.k_; }
+// int k_;
+// };
+//
+// btree_map<K, V> m; // Uses linear search
+//
+// If T has the preference tag, then it has a preference.
+// Btree will use the tag's truth value.
+template <typename T, typename = void>
+struct has_linear_node_search_preference : std::false_type {};
+template <typename T, typename = void>
+struct prefers_linear_node_search : std::false_type {};
+template <typename T>
+struct has_linear_node_search_preference<
+ T, absl::void_t<typename T::absl_btree_prefer_linear_node_search>>
+ : std::true_type {};
+template <typename T>
+struct prefers_linear_node_search<
+ T, absl::void_t<typename T::absl_btree_prefer_linear_node_search>>
+ : T::absl_btree_prefer_linear_node_search {};
+
+template <typename Key, typename Compare, typename Alloc, int TargetNodeSize,
+ bool Multi, typename SlotPolicy>
+struct common_params {
+ // If Compare is a common comparator for a string-like type, then we adapt it
+ // to use heterogeneous lookup and to be a key-compare-to comparator.
+ using key_compare = typename key_compare_to_adapter<Compare>::type;
+ // True when key_compare has been adapted to StringBtreeDefault{Less,Greater}.
+ using is_key_compare_adapted =
+ absl::negation<std::is_same<key_compare, Compare>>;
+ // A type which indicates if we have a key-compare-to functor or a plain old
+ // key-compare functor.
+ using is_key_compare_to = btree_is_key_compare_to<key_compare, Key>;
+
+ using allocator_type = Alloc;
+ using key_type = Key;
+ using size_type = std::make_signed<size_t>::type;
+ using difference_type = ptrdiff_t;
+
+ // True if this is a multiset or multimap.
+ using is_multi_container = std::integral_constant<bool, Multi>;
+
+ using slot_policy = SlotPolicy;
+ using slot_type = typename slot_policy::slot_type;
+ using value_type = typename slot_policy::value_type;
+ using init_type = typename slot_policy::mutable_value_type;
+ using pointer = value_type *;
+ using const_pointer = const value_type *;
+ using reference = value_type &;
+ using const_reference = const value_type &;
+
+ enum {
+ kTargetNodeSize = TargetNodeSize,
+
+ // Upper bound for the available space for values. This is largest for leaf
+ // nodes, which have overhead of at least a pointer + 4 bytes (for storing
+ // 3 field_types and an enum).
+ kNodeValueSpace =
+ TargetNodeSize - /*minimum overhead=*/(sizeof(void *) + 4),
+ };
+
+ // This is an integral type large enough to hold as many
+ // ValueSize-values as will fit a node of TargetNodeSize bytes.
+ using node_count_type =
+ absl::conditional_t<(kNodeValueSpace / sizeof(value_type) >
+ (std::numeric_limits<uint8_t>::max)()),
+ uint16_t, uint8_t>; // NOLINT
+
+ // The following methods are necessary for passing this struct as PolicyTraits
+ // for node_handle and/or are used within btree.
+ static value_type &element(slot_type *slot) {
+ return slot_policy::element(slot);
+ }
+ static const value_type &element(const slot_type *slot) {
+ return slot_policy::element(slot);
+ }
+ template <class... Args>
+ static void construct(Alloc *alloc, slot_type *slot, Args &&... args) {
+ slot_policy::construct(alloc, slot, std::forward<Args>(args)...);
+ }
+ static void construct(Alloc *alloc, slot_type *slot, slot_type *other) {
+ slot_policy::construct(alloc, slot, other);
+ }
+ static void destroy(Alloc *alloc, slot_type *slot) {
+ slot_policy::destroy(alloc, slot);
+ }
+ static void transfer(Alloc *alloc, slot_type *new_slot, slot_type *old_slot) {
+ construct(alloc, new_slot, old_slot);
+ destroy(alloc, old_slot);
+ }
+ static void swap(Alloc *alloc, slot_type *a, slot_type *b) {
+ slot_policy::swap(alloc, a, b);
+ }
+ static void move(Alloc *alloc, slot_type *src, slot_type *dest) {
+ slot_policy::move(alloc, src, dest);
+ }
+};
+
+// A parameters structure for holding the type parameters for a btree_map.
+// Compare and Alloc should be nothrow copy-constructible.
+template <typename Key, typename Data, typename Compare, typename Alloc,
+ int TargetNodeSize, bool Multi>
+struct map_params : common_params<Key, Compare, Alloc, TargetNodeSize, Multi,
+ map_slot_policy<Key, Data>> {
+ using super_type = typename map_params::common_params;
+ using mapped_type = Data;
+ // This type allows us to move keys when it is safe to do so. It is safe
+ // for maps in which value_type and mutable_value_type are layout compatible.
+ using slot_policy = typename super_type::slot_policy;
+ using slot_type = typename super_type::slot_type;
+ using value_type = typename super_type::value_type;
+ using init_type = typename super_type::init_type;
+
+ using key_compare = typename super_type::key_compare;
+ // Inherit from key_compare for empty base class optimization.
+ struct value_compare : private key_compare {
+ value_compare() = default;
+ explicit value_compare(const key_compare &cmp) : key_compare(cmp) {}
+
+ template <typename T, typename U>
+ auto operator()(const T &left, const U &right) const
+ -> decltype(std::declval<key_compare>()(left.first, right.first)) {
+ return key_compare::operator()(left.first, right.first);
+ }
+ };
+ using is_map_container = std::true_type;
+
+ template <typename V>
+ static auto key(const V &value) -> decltype(value.first) {
+ return value.first;
+ }
+ static const Key &key(const slot_type *s) { return slot_policy::key(s); }
+ static const Key &key(slot_type *s) { return slot_policy::key(s); }
+ // For use in node handle.
+ static auto mutable_key(slot_type *s)
+ -> decltype(slot_policy::mutable_key(s)) {
+ return slot_policy::mutable_key(s);
+ }
+ static mapped_type &value(value_type *value) { return value->second; }
+};
+
+// This type implements the necessary functions from the
+// absl::container_internal::slot_type interface.
+template <typename Key>
+struct set_slot_policy {
+ using slot_type = Key;
+ using value_type = Key;
+ using mutable_value_type = Key;
+
+ static value_type &element(slot_type *slot) { return *slot; }
+ static const value_type &element(const slot_type *slot) { return *slot; }
+
+ template <typename Alloc, class... Args>
+ static void construct(Alloc *alloc, slot_type *slot, Args &&... args) {
+ absl::allocator_traits<Alloc>::construct(*alloc, slot,
+ std::forward<Args>(args)...);
+ }
+
+ template <typename Alloc>
+ static void construct(Alloc *alloc, slot_type *slot, slot_type *other) {
+ absl::allocator_traits<Alloc>::construct(*alloc, slot, std::move(*other));
+ }
+
+ template <typename Alloc>
+ static void destroy(Alloc *alloc, slot_type *slot) {
+ absl::allocator_traits<Alloc>::destroy(*alloc, slot);
+ }
+
+ template <typename Alloc>
+ static void swap(Alloc * /*alloc*/, slot_type *a, slot_type *b) {
+ using std::swap;
+ swap(*a, *b);
+ }
+
+ template <typename Alloc>
+ static void move(Alloc * /*alloc*/, slot_type *src, slot_type *dest) {
+ *dest = std::move(*src);
+ }
+};
+
+// A parameters structure for holding the type parameters for a btree_set.
+// Compare and Alloc should be nothrow copy-constructible.
+template <typename Key, typename Compare, typename Alloc, int TargetNodeSize,
+ bool Multi>
+struct set_params : common_params<Key, Compare, Alloc, TargetNodeSize, Multi,
+ set_slot_policy<Key>> {
+ using value_type = Key;
+ using slot_type = typename set_params::common_params::slot_type;
+ using value_compare = typename set_params::common_params::key_compare;
+ using is_map_container = std::false_type;
+
+ template <typename V>
+ static const V &key(const V &value) { return value; }
+ static const Key &key(const slot_type *slot) { return *slot; }
+ static const Key &key(slot_type *slot) { return *slot; }
+};
+
+// An adapter class that converts a lower-bound compare into an upper-bound
+// compare. Note: there is no need to make a version of this adapter specialized
+// for key-compare-to functors because the upper-bound (the first value greater
+// than the input) is never an exact match.
+template <typename Compare>
+struct upper_bound_adapter {
+ explicit upper_bound_adapter(const Compare &c) : comp(c) {}
+ template <typename K1, typename K2>
+ bool operator()(const K1 &a, const K2 &b) const {
+ // Returns true when a is not greater than b.
+ return !compare_internal::compare_result_as_less_than(comp(b, a));
+ }
+
+ private:
+ Compare comp;
+};
+
+enum class MatchKind : uint8_t { kEq, kNe };
+
+template <typename V, bool IsCompareTo>
+struct SearchResult {
+ V value;
+ MatchKind match;
+
+ static constexpr bool HasMatch() { return true; }
+ bool IsEq() const { return match == MatchKind::kEq; }
+};
+
+// When we don't use CompareTo, `match` is not present.
+// This ensures that callers can't use it accidentally when it provides no
+// useful information.
+template <typename V>
+struct SearchResult<V, false> {
+ SearchResult() {}
+ explicit SearchResult(V value) : value(value) {}
+ SearchResult(V value, MatchKind /*match*/) : value(value) {}
+
+ V value;
+
+ static constexpr bool HasMatch() { return false; }
+ static constexpr bool IsEq() { return false; }
+};
+
+// A node in the btree holding. The same node type is used for both internal
+// and leaf nodes in the btree, though the nodes are allocated in such a way
+// that the children array is only valid in internal nodes.
+template <typename Params>
+class btree_node {
+ using is_key_compare_to = typename Params::is_key_compare_to;
+ using is_multi_container = typename Params::is_multi_container;
+ using field_type = typename Params::node_count_type;
+ using allocator_type = typename Params::allocator_type;
+ using slot_type = typename Params::slot_type;
+
+ public:
+ using params_type = Params;
+ using key_type = typename Params::key_type;
+ using value_type = typename Params::value_type;
+ using pointer = typename Params::pointer;
+ using const_pointer = typename Params::const_pointer;
+ using reference = typename Params::reference;
+ using const_reference = typename Params::const_reference;
+ using key_compare = typename Params::key_compare;
+ using size_type = typename Params::size_type;
+ using difference_type = typename Params::difference_type;
+
+ // Btree decides whether to use linear node search as follows:
+ // - If the comparator expresses a preference, use that.
+ // - If the key expresses a preference, use that.
+ // - If the key is arithmetic and the comparator is std::less or
+ // std::greater, choose linear.
+ // - Otherwise, choose binary.
+ // TODO(ezb): Might make sense to add condition(s) based on node-size.
+ using use_linear_search = std::integral_constant<
+ bool,
+ has_linear_node_search_preference<key_compare>::value
+ ? prefers_linear_node_search<key_compare>::value
+ : has_linear_node_search_preference<key_type>::value
+ ? prefers_linear_node_search<key_type>::value
+ : std::is_arithmetic<key_type>::value &&
+ (std::is_same<std::less<key_type>, key_compare>::value ||
+ std::is_same<std::greater<key_type>,
+ key_compare>::value)>;
+
+ // This class is organized by gtl::Layout as if it had the following
+ // structure:
+ // // A pointer to the node's parent.
+ // btree_node *parent;
+ //
+ // // The position of the node in the node's parent.
+ // field_type position;
+ // // The index of the first populated value in `values`.
+ // // TODO(ezb): right now, `start` is always 0. Update insertion/merge
+ // // logic to allow for floating storage within nodes.
+ // field_type start;
+ // // The index after the last populated value in `values`. Currently, this
+ // // is the same as the count of values.
+ // field_type finish;
+ // // The maximum number of values the node can hold. This is an integer in
+ // // [1, kNodeValues] for root leaf nodes, kNodeValues for non-root leaf
+ // // nodes, and kInternalNodeMaxCount (as a sentinel value) for internal
+ // // nodes (even though there are still kNodeValues values in the node).
+ // // TODO(ezb): make max_count use only 4 bits and record log2(capacity)
+ // // to free extra bits for is_root, etc.
+ // field_type max_count;
+ //
+ // // The array of values. The capacity is `max_count` for leaf nodes and
+ // // kNodeValues for internal nodes. Only the values in
+ // // [start, finish) have been initialized and are valid.
+ // slot_type values[max_count];
+ //
+ // // The array of child pointers. The keys in children[i] are all less
+ // // than key(i). The keys in children[i + 1] are all greater than key(i).
+ // // There are 0 children for leaf nodes and kNodeValues + 1 children for
+ // // internal nodes.
+ // btree_node *children[kNodeValues + 1];
+ //
+ // This class is only constructed by EmptyNodeType. Normally, pointers to the
+ // layout above are allocated, cast to btree_node*, and de-allocated within
+ // the btree implementation.
+ ~btree_node() = default;
+ btree_node(btree_node const &) = delete;
+ btree_node &operator=(btree_node const &) = delete;
+
+ // Public for EmptyNodeType.
+ constexpr static size_type Alignment() {
+ static_assert(LeafLayout(1).Alignment() == InternalLayout().Alignment(),
+ "Alignment of all nodes must be equal.");
+ return InternalLayout().Alignment();
+ }
+
+ protected:
+ btree_node() = default;
+
+ private:
+ using layout_type = absl::container_internal::Layout<btree_node *, field_type,
+ slot_type, btree_node *>;
+ constexpr static size_type SizeWithNValues(size_type n) {
+ return layout_type(/*parent*/ 1,
+ /*position, start, finish, max_count*/ 4,
+ /*values*/ n,
+ /*children*/ 0)
+ .AllocSize();
+ }
+ // A lower bound for the overhead of fields other than values in a leaf node.
+ constexpr static size_type MinimumOverhead() {
+ return SizeWithNValues(1) - sizeof(value_type);
+ }
+
+ // Compute how many values we can fit onto a leaf node taking into account
+ // padding.
+ constexpr static size_type NodeTargetValues(const int begin, const int end) {
+ return begin == end ? begin
+ : SizeWithNValues((begin + end) / 2 + 1) >
+ params_type::kTargetNodeSize
+ ? NodeTargetValues(begin, (begin + end) / 2)
+ : NodeTargetValues((begin + end) / 2 + 1, end);
+ }
+
+ enum {
+ kTargetNodeSize = params_type::kTargetNodeSize,
+ kNodeTargetValues = NodeTargetValues(0, params_type::kTargetNodeSize),
+
+ // We need a minimum of 3 values per internal node in order to perform
+ // splitting (1 value for the two nodes involved in the split and 1 value
+ // propagated to the parent as the delimiter for the split).
+ kNodeValues = kNodeTargetValues >= 3 ? kNodeTargetValues : 3,
+
+ // The node is internal (i.e. is not a leaf node) if and only if `max_count`
+ // has this value.
+ kInternalNodeMaxCount = 0,
+ };
+
+ // Leaves can have less than kNodeValues values.
+ constexpr static layout_type LeafLayout(const int max_values = kNodeValues) {
+ return layout_type(/*parent*/ 1,
+ /*position, start, finish, max_count*/ 4,
+ /*values*/ max_values,
+ /*children*/ 0);
+ }
+ constexpr static layout_type InternalLayout() {
+ return layout_type(/*parent*/ 1,
+ /*position, start, finish, max_count*/ 4,
+ /*values*/ kNodeValues,
+ /*children*/ kNodeValues + 1);
+ }
+ constexpr static size_type LeafSize(const int max_values = kNodeValues) {
+ return LeafLayout(max_values).AllocSize();
+ }
+ constexpr static size_type InternalSize() {
+ return InternalLayout().AllocSize();
+ }
+
+ // N is the index of the type in the Layout definition.
+ // ElementType<N> is the Nth type in the Layout definition.
+ template <size_type N>
+ inline typename layout_type::template ElementType<N> *GetField() {
+ // We assert that we don't read from values that aren't there.
+ assert(N < 3 || !leaf());
+ return InternalLayout().template Pointer<N>(reinterpret_cast<char *>(this));
+ }
+ template <size_type N>
+ inline const typename layout_type::template ElementType<N> *GetField() const {
+ assert(N < 3 || !leaf());
+ return InternalLayout().template Pointer<N>(
+ reinterpret_cast<const char *>(this));
+ }
+ void set_parent(btree_node *p) { *GetField<0>() = p; }
+ field_type &mutable_finish() { return GetField<1>()[2]; }
+ slot_type *slot(int i) { return &GetField<2>()[i]; }
+ slot_type *start_slot() { return slot(start()); }
+ slot_type *finish_slot() { return slot(finish()); }
+ const slot_type *slot(int i) const { return &GetField<2>()[i]; }
+ void set_position(field_type v) { GetField<1>()[0] = v; }
+ void set_start(field_type v) { GetField<1>()[1] = v; }
+ void set_finish(field_type v) { GetField<1>()[2] = v; }
+ // This method is only called by the node init methods.
+ void set_max_count(field_type v) { GetField<1>()[3] = v; }
+
+ public:
+ // Whether this is a leaf node or not. This value doesn't change after the
+ // node is created.
+ bool leaf() const { return GetField<1>()[3] != kInternalNodeMaxCount; }
+
+ // Getter for the position of this node in its parent.
+ field_type position() const { return GetField<1>()[0]; }
+
+ // Getter for the offset of the first value in the `values` array.
+ field_type start() const {
+ // TODO(ezb): when floating storage is implemented, return GetField<1>()[1];
+ assert(GetField<1>()[1] == 0);
+ return 0;
+ }
+
+ // Getter for the offset after the last value in the `values` array.
+ field_type finish() const { return GetField<1>()[2]; }
+
+ // Getters for the number of values stored in this node.
+ field_type count() const {
+ assert(finish() >= start());
+ return finish() - start();
+ }
+ field_type max_count() const {
+ // Internal nodes have max_count==kInternalNodeMaxCount.
+ // Leaf nodes have max_count in [1, kNodeValues].
+ const field_type max_count = GetField<1>()[3];
+ return max_count == field_type{kInternalNodeMaxCount}
+ ? field_type{kNodeValues}
+ : max_count;
+ }
+
+ // Getter for the parent of this node.
+ btree_node *parent() const { return *GetField<0>(); }
+ // Getter for whether the node is the root of the tree. The parent of the
+ // root of the tree is the leftmost node in the tree which is guaranteed to
+ // be a leaf.
+ bool is_root() const { return parent()->leaf(); }
+ void make_root() {
+ assert(parent()->is_root());
+ set_parent(parent()->parent());
+ }
+
+ // Getters for the key/value at position i in the node.
+ const key_type &key(int i) const { return params_type::key(slot(i)); }
+ reference value(int i) { return params_type::element(slot(i)); }
+ const_reference value(int i) const { return params_type::element(slot(i)); }
+
+ // Getters/setter for the child at position i in the node.
+ btree_node *child(int i) const { return GetField<3>()[i]; }
+ btree_node *start_child() const { return child(start()); }
+ btree_node *&mutable_child(int i) { return GetField<3>()[i]; }
+ void clear_child(int i) {
+ absl::container_internal::SanitizerPoisonObject(&mutable_child(i));
+ }
+ void set_child(int i, btree_node *c) {
+ absl::container_internal::SanitizerUnpoisonObject(&mutable_child(i));
+ mutable_child(i) = c;
+ c->set_position(i);
+ }
+ void init_child(int i, btree_node *c) {
+ set_child(i, c);
+ c->set_parent(this);
+ }
+
+ // Returns the position of the first value whose key is not less than k.
+ template <typename K>
+ SearchResult<int, is_key_compare_to::value> lower_bound(
+ const K &k, const key_compare &comp) const {
+ return use_linear_search::value ? linear_search(k, comp)
+ : binary_search(k, comp);
+ }
+ // Returns the position of the first value whose key is greater than k.
+ template <typename K>
+ int upper_bound(const K &k, const key_compare &comp) const {
+ auto upper_compare = upper_bound_adapter<key_compare>(comp);
+ return use_linear_search::value ? linear_search(k, upper_compare).value
+ : binary_search(k, upper_compare).value;
+ }
+
+ template <typename K, typename Compare>
+ SearchResult<int, btree_is_key_compare_to<Compare, key_type>::value>
+ linear_search(const K &k, const Compare &comp) const {
+ return linear_search_impl(k, start(), finish(), comp,
+ btree_is_key_compare_to<Compare, key_type>());
+ }
+
+ template <typename K, typename Compare>
+ SearchResult<int, btree_is_key_compare_to<Compare, key_type>::value>
+ binary_search(const K &k, const Compare &comp) const {
+ return binary_search_impl(k, start(), finish(), comp,
+ btree_is_key_compare_to<Compare, key_type>());
+ }
+
+ // Returns the position of the first value whose key is not less than k using
+ // linear search performed using plain compare.
+ template <typename K, typename Compare>
+ SearchResult<int, false> linear_search_impl(
+ const K &k, int s, const int e, const Compare &comp,
+ std::false_type /* IsCompareTo */) const {
+ while (s < e) {
+ if (!comp(key(s), k)) {
+ break;
+ }
+ ++s;
+ }
+ return SearchResult<int, false>{s};
+ }
+
+ // Returns the position of the first value whose key is not less than k using
+ // linear search performed using compare-to.
+ template <typename K, typename Compare>
+ SearchResult<int, true> linear_search_impl(
+ const K &k, int s, const int e, const Compare &comp,
+ std::true_type /* IsCompareTo */) const {
+ while (s < e) {
+ const absl::weak_ordering c = comp(key(s), k);
+ if (c == 0) {
+ return {s, MatchKind::kEq};
+ } else if (c > 0) {
+ break;
+ }
+ ++s;
+ }
+ return {s, MatchKind::kNe};
+ }
+
+ // Returns the position of the first value whose key is not less than k using
+ // binary search performed using plain compare.
+ template <typename K, typename Compare>
+ SearchResult<int, false> binary_search_impl(
+ const K &k, int s, int e, const Compare &comp,
+ std::false_type /* IsCompareTo */) const {
+ while (s != e) {
+ const int mid = (s + e) >> 1;
+ if (comp(key(mid), k)) {
+ s = mid + 1;
+ } else {
+ e = mid;
+ }
+ }
+ return SearchResult<int, false>{s};
+ }
+
+ // Returns the position of the first value whose key is not less than k using
+ // binary search performed using compare-to.
+ template <typename K, typename CompareTo>
+ SearchResult<int, true> binary_search_impl(
+ const K &k, int s, int e, const CompareTo &comp,
+ std::true_type /* IsCompareTo */) const {
+ if (is_multi_container::value) {
+ MatchKind exact_match = MatchKind::kNe;
+ while (s != e) {
+ const int mid = (s + e) >> 1;
+ const absl::weak_ordering c = comp(key(mid), k);
+ if (c < 0) {
+ s = mid + 1;
+ } else {
+ e = mid;
+ if (c == 0) {
+ // Need to return the first value whose key is not less than k,
+ // which requires continuing the binary search if this is a
+ // multi-container.
+ exact_match = MatchKind::kEq;
+ }
+ }
+ }
+ return {s, exact_match};
+ } else { // Not a multi-container.
+ while (s != e) {
+ const int mid = (s + e) >> 1;
+ const absl::weak_ordering c = comp(key(mid), k);
+ if (c < 0) {
+ s = mid + 1;
+ } else if (c > 0) {
+ e = mid;
+ } else {
+ return {mid, MatchKind::kEq};
+ }
+ }
+ return {s, MatchKind::kNe};
+ }
+ }
+
+ // Emplaces a value at position i, shifting all existing values and
+ // children at positions >= i to the right by 1.
+ template <typename... Args>
+ void emplace_value(size_type i, allocator_type *alloc, Args &&... args);
+
+ // Removes the values at positions [i, i + to_erase), shifting all existing
+ // values and children after that range to the left by to_erase. Clears all
+ // children between [i, i + to_erase).
+ void remove_values(field_type i, field_type to_erase, allocator_type *alloc);
+
+ // Rebalances a node with its right sibling.
+ void rebalance_right_to_left(int to_move, btree_node *right,
+ allocator_type *alloc);
+ void rebalance_left_to_right(int to_move, btree_node *right,
+ allocator_type *alloc);
+
+ // Splits a node, moving a portion of the node's values to its right sibling.
+ void split(int insert_position, btree_node *dest, allocator_type *alloc);
+
+ // Merges a node with its right sibling, moving all of the values and the
+ // delimiting key in the parent node onto itself, and deleting the src node.
+ void merge(btree_node *src, allocator_type *alloc);
+
+ // Node allocation/deletion routines.
+ void init_leaf(btree_node *parent, int max_count) {
+ set_parent(parent);
+ set_position(0);
+ set_start(0);
+ set_finish(0);
+ set_max_count(max_count);
+ absl::container_internal::SanitizerPoisonMemoryRegion(
+ start_slot(), max_count * sizeof(slot_type));
+ }
+ void init_internal(btree_node *parent) {
+ init_leaf(parent, kNodeValues);
+ // Set `max_count` to a sentinel value to indicate that this node is
+ // internal.
+ set_max_count(kInternalNodeMaxCount);
+ absl::container_internal::SanitizerPoisonMemoryRegion(
+ &mutable_child(start()), (kNodeValues + 1) * sizeof(btree_node *));
+ }
+
+ static void deallocate(const size_type size, btree_node *node,
+ allocator_type *alloc) {
+ absl::container_internal::Deallocate<Alignment()>(alloc, node, size);
+ }
+
+ // Deletes a node and all of its children.
+ static void clear_and_delete(btree_node *node, allocator_type *alloc);
+
+ private:
+ template <typename... Args>
+ void value_init(const field_type i, allocator_type *alloc, Args &&... args) {
+ absl::container_internal::SanitizerUnpoisonObject(slot(i));
+ params_type::construct(alloc, slot(i), std::forward<Args>(args)...);
+ }
+ void value_destroy(const field_type i, allocator_type *alloc) {
+ params_type::destroy(alloc, slot(i));
+ absl::container_internal::SanitizerPoisonObject(slot(i));
+ }
+ void value_destroy_n(const field_type i, const field_type n,
+ allocator_type *alloc) {
+ for (slot_type *s = slot(i), *end = slot(i + n); s != end; ++s) {
+ params_type::destroy(alloc, s);
+ absl::container_internal::SanitizerPoisonObject(s);
+ }
+ }
+
+ static void transfer(slot_type *dest, slot_type *src, allocator_type *alloc) {
+ absl::container_internal::SanitizerUnpoisonObject(dest);
+ params_type::transfer(alloc, dest, src);
+ absl::container_internal::SanitizerPoisonObject(src);
+ }
+
+ // Transfers value from slot `src_i` in `src_node` to slot `dest_i` in `this`.
+ void transfer(const size_type dest_i, const size_type src_i,
+ btree_node *src_node, allocator_type *alloc) {
+ transfer(slot(dest_i), src_node->slot(src_i), alloc);
+ }
+
+ // Transfers `n` values starting at value `src_i` in `src_node` into the
+ // values starting at value `dest_i` in `this`.
+ void transfer_n(const size_type n, const size_type dest_i,
+ const size_type src_i, btree_node *src_node,
+ allocator_type *alloc) {
+ for (slot_type *src = src_node->slot(src_i), *end = src + n,
+ *dest = slot(dest_i);
+ src != end; ++src, ++dest) {
+ transfer(dest, src, alloc);
+ }
+ }
+
+ // Same as above, except that we start at the end and work our way to the
+ // beginning.
+ void transfer_n_backward(const size_type n, const size_type dest_i,
+ const size_type src_i, btree_node *src_node,
+ allocator_type *alloc) {
+ for (slot_type *src = src_node->slot(src_i + n - 1), *end = src - n,
+ *dest = slot(dest_i + n - 1);
+ src != end; --src, --dest) {
+ transfer(dest, src, alloc);
+ }
+ }
+
+ template <typename P>
+ friend class btree;
+ template <typename N, typename R, typename P>
+ friend struct btree_iterator;
+ friend class BtreeNodePeer;
+};
+
+template <typename Node, typename Reference, typename Pointer>
+struct btree_iterator {
+ private:
+ using key_type = typename Node::key_type;
+ using size_type = typename Node::size_type;
+ using params_type = typename Node::params_type;
+
+ using node_type = Node;
+ using normal_node = typename std::remove_const<Node>::type;
+ using const_node = const Node;
+ using normal_pointer = typename params_type::pointer;
+ using normal_reference = typename params_type::reference;
+ using const_pointer = typename params_type::const_pointer;
+ using const_reference = typename params_type::const_reference;
+ using slot_type = typename params_type::slot_type;
+
+ using iterator =
+ btree_iterator<normal_node, normal_reference, normal_pointer>;
+ using const_iterator =
+ btree_iterator<const_node, const_reference, const_pointer>;
+
+ public:
+ // These aliases are public for std::iterator_traits.
+ using difference_type = typename Node::difference_type;
+ using value_type = typename params_type::value_type;
+ using pointer = Pointer;
+ using reference = Reference;
+ using iterator_category = std::bidirectional_iterator_tag;
+
+ btree_iterator() : node(nullptr), position(-1) {}
+ explicit btree_iterator(Node *n) : node(n), position(n->start()) {}
+ btree_iterator(Node *n, int p) : node(n), position(p) {}
+
+ // NOTE: this SFINAE allows for implicit conversions from iterator to
+ // const_iterator, but it specifically avoids defining copy constructors so
+ // that btree_iterator can be trivially copyable. This is for performance and
+ // binary size reasons.
+ template <typename N, typename R, typename P,
+ absl::enable_if_t<
+ std::is_same<btree_iterator<N, R, P>, iterator>::value &&
+ std::is_same<btree_iterator, const_iterator>::value,
+ int> = 0>
+ btree_iterator(const btree_iterator<N, R, P> &other) // NOLINT
+ : node(other.node), position(other.position) {}
+
+ private:
+ // This SFINAE allows explicit conversions from const_iterator to
+ // iterator, but also avoids defining a copy constructor.
+ // NOTE: the const_cast is safe because this constructor is only called by
+ // non-const methods and the container owns the nodes.
+ template <typename N, typename R, typename P,
+ absl::enable_if_t<
+ std::is_same<btree_iterator<N, R, P>, const_iterator>::value &&
+ std::is_same<btree_iterator, iterator>::value,
+ int> = 0>
+ explicit btree_iterator(const btree_iterator<N, R, P> &other)
+ : node(const_cast<node_type *>(other.node)), position(other.position) {}
+
+ // Increment/decrement the iterator.
+ void increment() {
+ if (node->leaf() && ++position < node->finish()) {
+ return;
+ }
+ increment_slow();
+ }
+ void increment_slow();
+
+ void decrement() {
+ if (node->leaf() && --position >= node->start()) {
+ return;
+ }
+ decrement_slow();
+ }
+ void decrement_slow();
+
+ public:
+ bool operator==(const iterator &other) const {
+ return node == other.node && position == other.position;
+ }
+ bool operator==(const const_iterator &other) const {
+ return node == other.node && position == other.position;
+ }
+ bool operator!=(const iterator &other) const {
+ return node != other.node || position != other.position;
+ }
+ bool operator!=(const const_iterator &other) const {
+ return node != other.node || position != other.position;
+ }
+
+ // Accessors for the key/value the iterator is pointing at.
+ reference operator*() const {
+ ABSL_HARDENING_ASSERT(node != nullptr);
+ ABSL_HARDENING_ASSERT(node->start() <= position);
+ ABSL_HARDENING_ASSERT(node->finish() > position);
+ return node->value(position);
+ }
+ pointer operator->() const { return &operator*(); }
+
+ btree_iterator &operator++() {
+ increment();
+ return *this;
+ }
+ btree_iterator &operator--() {
+ decrement();
+ return *this;
+ }
+ btree_iterator operator++(int) {
+ btree_iterator tmp = *this;
+ ++*this;
+ return tmp;
+ }
+ btree_iterator operator--(int) {
+ btree_iterator tmp = *this;
+ --*this;
+ return tmp;
+ }
+
+ private:
+ template <typename Params>
+ friend class btree;
+ template <typename Tree>
+ friend class btree_container;
+ template <typename Tree>
+ friend class btree_set_container;
+ template <typename Tree>
+ friend class btree_map_container;
+ template <typename Tree>
+ friend class btree_multiset_container;
+ template <typename N, typename R, typename P>
+ friend struct btree_iterator;
+ template <typename TreeType, typename CheckerType>
+ friend class base_checker;
+
+ const key_type &key() const { return node->key(position); }
+ slot_type *slot() { return node->slot(position); }
+
+ // The node in the tree the iterator is pointing at.
+ Node *node;
+ // The position within the node of the tree the iterator is pointing at.
+ // NOTE: this is an int rather than a field_type because iterators can point
+ // to invalid positions (such as -1) in certain circumstances.
+ int position;
+};
+
+template <typename Params>
+class btree {
+ using node_type = btree_node<Params>;
+ using is_key_compare_to = typename Params::is_key_compare_to;
+ using init_type = typename Params::init_type;
+ using field_type = typename node_type::field_type;
+ using is_multi_container = typename Params::is_multi_container;
+ using is_key_compare_adapted = typename Params::is_key_compare_adapted;
+
+ // We use a static empty node for the root/leftmost/rightmost of empty btrees
+ // in order to avoid branching in begin()/end().
+ struct alignas(node_type::Alignment()) EmptyNodeType : node_type {
+ using field_type = typename node_type::field_type;
+ node_type *parent;
+ field_type position = 0;
+ field_type start = 0;
+ field_type finish = 0;
+ // max_count must be != kInternalNodeMaxCount (so that this node is regarded
+ // as a leaf node). max_count() is never called when the tree is empty.
+ field_type max_count = node_type::kInternalNodeMaxCount + 1;
+
+#ifdef _MSC_VER
+ // MSVC has constexpr code generations bugs here.
+ EmptyNodeType() : parent(this) {}
+#else
+ constexpr EmptyNodeType(node_type *p) : parent(p) {}
+#endif
+ };
+
+ static node_type *EmptyNode() {
+#ifdef _MSC_VER
+ static EmptyNodeType *empty_node = new EmptyNodeType;
+ // This assert fails on some other construction methods.
+ assert(empty_node->parent == empty_node);
+ return empty_node;
+#else
+ static constexpr EmptyNodeType empty_node(
+ const_cast<EmptyNodeType *>(&empty_node));
+ return const_cast<EmptyNodeType *>(&empty_node);
+#endif
+ }
+
+ enum : uint32_t {
+ kNodeValues = node_type::kNodeValues,
+ kMinNodeValues = kNodeValues / 2,
+ };
+
+ struct node_stats {
+ using size_type = typename Params::size_type;
+
+ node_stats(size_type l, size_type i) : leaf_nodes(l), internal_nodes(i) {}
+
+ node_stats &operator+=(const node_stats &other) {
+ leaf_nodes += other.leaf_nodes;
+ internal_nodes += other.internal_nodes;
+ return *this;
+ }
+
+ size_type leaf_nodes;
+ size_type internal_nodes;
+ };
+
+ public:
+ using key_type = typename Params::key_type;
+ using value_type = typename Params::value_type;
+ using size_type = typename Params::size_type;
+ using difference_type = typename Params::difference_type;
+ using key_compare = typename Params::key_compare;
+ using value_compare = typename Params::value_compare;
+ using allocator_type = typename Params::allocator_type;
+ using reference = typename Params::reference;
+ using const_reference = typename Params::const_reference;
+ using pointer = typename Params::pointer;
+ using const_pointer = typename Params::const_pointer;
+ using iterator = btree_iterator<node_type, reference, pointer>;
+ using const_iterator = typename iterator::const_iterator;
+ using reverse_iterator = std::reverse_iterator<iterator>;
+ using const_reverse_iterator = std::reverse_iterator<const_iterator>;
+ using node_handle_type = node_handle<Params, Params, allocator_type>;
+
+ // Internal types made public for use by btree_container types.
+ using params_type = Params;
+ using slot_type = typename Params::slot_type;
+
+ private:
+ // For use in copy_or_move_values_in_order.
+ const value_type &maybe_move_from_iterator(const_iterator it) { return *it; }
+ value_type &&maybe_move_from_iterator(iterator it) { return std::move(*it); }
+
+ // Copies or moves (depending on the template parameter) the values in
+ // other into this btree in their order in other. This btree must be empty
+ // before this method is called. This method is used in copy construction,
+ // copy assignment, and move assignment.
+ template <typename Btree>
+ void copy_or_move_values_in_order(Btree &other);
+
+ // Validates that various assumptions/requirements are true at compile time.
+ constexpr static bool static_assert_validation();
+
+ public:
+ btree(const key_compare &comp, const allocator_type &alloc)
+ : root_(comp, alloc, EmptyNode()), rightmost_(EmptyNode()), size_(0) {}
+
+ btree(const btree &other) : btree(other, other.allocator()) {}
+ btree(const btree &other, const allocator_type &alloc)
+ : btree(other.key_comp(), alloc) {
+ copy_or_move_values_in_order(other);
+ }
+ btree(btree &&other) noexcept
+ : root_(std::move(other.root_)),
+ rightmost_(absl::exchange(other.rightmost_, EmptyNode())),
+ size_(absl::exchange(other.size_, 0)) {
+ other.mutable_root() = EmptyNode();
+ }
+ btree(btree &&other, const allocator_type &alloc)
+ : btree(other.key_comp(), alloc) {
+ if (alloc == other.allocator()) {
+ swap(other);
+ } else {
+ // Move values from `other` one at a time when allocators are different.
+ copy_or_move_values_in_order(other);
+ }
+ }
+
+ ~btree() {
+ // Put static_asserts in destructor to avoid triggering them before the type
+ // is complete.
+ static_assert(static_assert_validation(), "This call must be elided.");
+ clear();
+ }
+
+ // Assign the contents of other to *this.
+ btree &operator=(const btree &other);
+ btree &operator=(btree &&other) noexcept;
+
+ iterator begin() { return iterator(leftmost()); }
+ const_iterator begin() const { return const_iterator(leftmost()); }
+ iterator end() { return iterator(rightmost_, rightmost_->finish()); }
+ const_iterator end() const {
+ return const_iterator(rightmost_, rightmost_->finish());
+ }
+ reverse_iterator rbegin() { return reverse_iterator(end()); }
+ const_reverse_iterator rbegin() const {
+ return const_reverse_iterator(end());
+ }
+ reverse_iterator rend() { return reverse_iterator(begin()); }
+ const_reverse_iterator rend() const {
+ return const_reverse_iterator(begin());
+ }
+
+ // Finds the first element whose key is not less than key.
+ template <typename K>
+ iterator lower_bound(const K &key) {
+ return internal_end(internal_lower_bound(key).value);
+ }
+ template <typename K>
+ const_iterator lower_bound(const K &key) const {
+ return internal_end(internal_lower_bound(key).value);
+ }
+
+ // Finds the first element whose key is greater than key.
+ template <typename K>
+ iterator upper_bound(const K &key) {
+ return internal_end(internal_upper_bound(key));
+ }
+ template <typename K>
+ const_iterator upper_bound(const K &key) const {
+ return internal_end(internal_upper_bound(key));
+ }
+
+ // Finds the range of values which compare equal to key. The first member of
+ // the returned pair is equal to lower_bound(key). The second member of the
+ // pair is equal to upper_bound(key).
+ template <typename K>
+ std::pair<iterator, iterator> equal_range(const K &key);
+ template <typename K>
+ std::pair<const_iterator, const_iterator> equal_range(const K &key) const {
+ return const_cast<btree *>(this)->equal_range(key);
+ }
+
+ // Inserts a value into the btree only if it does not already exist. The
+ // boolean return value indicates whether insertion succeeded or failed.
+ // Requirement: if `key` already exists in the btree, does not consume `args`.
+ // Requirement: `key` is never referenced after consuming `args`.
+ template <typename K, typename... Args>
+ std::pair<iterator, bool> insert_unique(const K &key, Args &&... args);
+
+ // Inserts with hint. Checks to see if the value should be placed immediately
+ // before `position` in the tree. If so, then the insertion will take
+ // amortized constant time. If not, the insertion will take amortized
+ // logarithmic time as if a call to insert_unique() were made.
+ // Requirement: if `key` already exists in the btree, does not consume `args`.
+ // Requirement: `key` is never referenced after consuming `args`.
+ template <typename K, typename... Args>
+ std::pair<iterator, bool> insert_hint_unique(iterator position,
+ const K &key,
+ Args &&... args);
+
+ // Insert a range of values into the btree.
+ // Note: the first overload avoids constructing a value_type if the key
+ // already exists in the btree.
+ template <typename InputIterator,
+ typename = decltype(std::declval<const key_compare &>()(
+ params_type::key(*std::declval<InputIterator>()),
+ std::declval<const key_type &>()))>
+ void insert_iterator_unique(InputIterator b, InputIterator e, int);
+ // We need the second overload for cases in which we need to construct a
+ // value_type in order to compare it with the keys already in the btree.
+ template <typename InputIterator>
+ void insert_iterator_unique(InputIterator b, InputIterator e, char);
+
+ // Inserts a value into the btree.
+ template <typename ValueType>
+ iterator insert_multi(const key_type &key, ValueType &&v);
+
+ // Inserts a value into the btree.
+ template <typename ValueType>
+ iterator insert_multi(ValueType &&v) {
+ return insert_multi(params_type::key(v), std::forward<ValueType>(v));
+ }
+
+ // Insert with hint. Check to see if the value should be placed immediately
+ // before position in the tree. If it does, then the insertion will take
+ // amortized constant time. If not, the insertion will take amortized
+ // logarithmic time as if a call to insert_multi(v) were made.
+ template <typename ValueType>
+ iterator insert_hint_multi(iterator position, ValueType &&v);
+
+ // Insert a range of values into the btree.
+ template <typename InputIterator>
+ void insert_iterator_multi(InputIterator b, InputIterator e);
+
+ // Erase the specified iterator from the btree. The iterator must be valid
+ // (i.e. not equal to end()). Return an iterator pointing to the node after
+ // the one that was erased (or end() if none exists).
+ // Requirement: does not read the value at `*iter`.
+ iterator erase(iterator iter);
+
+ // Erases range. Returns the number of keys erased and an iterator pointing
+ // to the element after the last erased element.
+ std::pair<size_type, iterator> erase_range(iterator begin, iterator end);
+
+ // Finds the iterator corresponding to a key or returns end() if the key is
+ // not present.
+ template <typename K>
+ iterator find(const K &key) {
+ return internal_end(internal_find(key));
+ }
+ template <typename K>
+ const_iterator find(const K &key) const {
+ return internal_end(internal_find(key));
+ }
+
+ // Clear the btree, deleting all of the values it contains.
+ void clear();
+
+ // Swaps the contents of `this` and `other`.
+ void swap(btree &other);
+
+ const key_compare &key_comp() const noexcept {
+ return root_.template get<0>();
+ }
+ template <typename K1, typename K2>
+ bool compare_keys(const K1 &a, const K2 &b) const {
+ return compare_internal::compare_result_as_less_than(key_comp()(a, b));
+ }
+
+ value_compare value_comp() const { return value_compare(key_comp()); }
+
+ // Verifies the structure of the btree.
+ void verify() const;
+
+ // Size routines.
+ size_type size() const { return size_; }
+ size_type max_size() const { return (std::numeric_limits<size_type>::max)(); }
+ bool empty() const { return size_ == 0; }
+
+ // The height of the btree. An empty tree will have height 0.
+ size_type height() const {
+ size_type h = 0;
+ if (!empty()) {
+ // Count the length of the chain from the leftmost node up to the
+ // root. We actually count from the root back around to the level below
+ // the root, but the calculation is the same because of the circularity
+ // of that traversal.
+ const node_type *n = root();
+ do {
+ ++h;
+ n = n->parent();
+ } while (n != root());
+ }
+ return h;
+ }
+
+ // The number of internal, leaf and total nodes used by the btree.
+ size_type leaf_nodes() const { return internal_stats(root()).leaf_nodes; }
+ size_type internal_nodes() const {
+ return internal_stats(root()).internal_nodes;
+ }
+ size_type nodes() const {
+ node_stats stats = internal_stats(root());
+ return stats.leaf_nodes + stats.internal_nodes;
+ }
+
+ // The total number of bytes used by the btree.
+ size_type bytes_used() const {
+ node_stats stats = internal_stats(root());
+ if (stats.leaf_nodes == 1 && stats.internal_nodes == 0) {
+ return sizeof(*this) + node_type::LeafSize(root()->max_count());
+ } else {
+ return sizeof(*this) + stats.leaf_nodes * node_type::LeafSize() +
+ stats.internal_nodes * node_type::InternalSize();
+ }
+ }
+
+ // The average number of bytes used per value stored in the btree.
+ static double average_bytes_per_value() {
+ // Returns the number of bytes per value on a leaf node that is 75%
+ // full. Experimentally, this matches up nicely with the computed number of
+ // bytes per value in trees that had their values inserted in random order.
+ return node_type::LeafSize() / (kNodeValues * 0.75);
+ }
+
+ // The fullness of the btree. Computed as the number of elements in the btree
+ // divided by the maximum number of elements a tree with the current number
+ // of nodes could hold. A value of 1 indicates perfect space
+ // utilization. Smaller values indicate space wastage.
+ // Returns 0 for empty trees.
+ double fullness() const {
+ if (empty()) return 0.0;
+ return static_cast<double>(size()) / (nodes() * kNodeValues);
+ }
+ // The overhead of the btree structure in bytes per node. Computed as the
+ // total number of bytes used by the btree minus the number of bytes used for
+ // storing elements divided by the number of elements.
+ // Returns 0 for empty trees.
+ double overhead() const {
+ if (empty()) return 0.0;
+ return (bytes_used() - size() * sizeof(value_type)) /
+ static_cast<double>(size());
+ }
+
+ // The allocator used by the btree.
+ allocator_type get_allocator() const { return allocator(); }
+
+ private:
+ // Internal accessor routines.
+ node_type *root() { return root_.template get<2>(); }
+ const node_type *root() const { return root_.template get<2>(); }
+ node_type *&mutable_root() noexcept { return root_.template get<2>(); }
+ key_compare *mutable_key_comp() noexcept { return &root_.template get<0>(); }
+
+ // The leftmost node is stored as the parent of the root node.
+ node_type *leftmost() { return root()->parent(); }
+ const node_type *leftmost() const { return root()->parent(); }
+
+ // Allocator routines.
+ allocator_type *mutable_allocator() noexcept {
+ return &root_.template get<1>();
+ }
+ const allocator_type &allocator() const noexcept {
+ return root_.template get<1>();
+ }
+
+ // Allocates a correctly aligned node of at least size bytes using the
+ // allocator.
+ node_type *allocate(const size_type size) {
+ return reinterpret_cast<node_type *>(
+ absl::container_internal::Allocate<node_type::Alignment()>(
+ mutable_allocator(), size));
+ }
+
+ // Node creation/deletion routines.
+ node_type *new_internal_node(node_type *parent) {
+ node_type *n = allocate(node_type::InternalSize());
+ n->init_internal(parent);
+ return n;
+ }
+ node_type *new_leaf_node(node_type *parent) {
+ node_type *n = allocate(node_type::LeafSize());
+ n->init_leaf(parent, kNodeValues);
+ return n;
+ }
+ node_type *new_leaf_root_node(const int max_count) {
+ node_type *n = allocate(node_type::LeafSize(max_count));
+ n->init_leaf(/*parent=*/n, max_count);
+ return n;
+ }
+
+ // Deletion helper routines.
+ iterator rebalance_after_delete(iterator iter);
+
+ // Rebalances or splits the node iter points to.
+ void rebalance_or_split(iterator *iter);
+
+ // Merges the values of left, right and the delimiting key on their parent
+ // onto left, removing the delimiting key and deleting right.
+ void merge_nodes(node_type *left, node_type *right);
+
+ // Tries to merge node with its left or right sibling, and failing that,
+ // rebalance with its left or right sibling. Returns true if a merge
+ // occurred, at which point it is no longer valid to access node. Returns
+ // false if no merging took place.
+ bool try_merge_or_rebalance(iterator *iter);
+
+ // Tries to shrink the height of the tree by 1.
+ void try_shrink();
+
+ iterator internal_end(iterator iter) {
+ return iter.node != nullptr ? iter : end();
+ }
+ const_iterator internal_end(const_iterator iter) const {
+ return iter.node != nullptr ? iter : end();
+ }
+
+ // Emplaces a value into the btree immediately before iter. Requires that
+ // key(v) <= iter.key() and (--iter).key() <= key(v).
+ template <typename... Args>
+ iterator internal_emplace(iterator iter, Args &&... args);
+
+ // Returns an iterator pointing to the first value >= the value "iter" is
+ // pointing at. Note that "iter" might be pointing to an invalid location such
+ // as iter.position == iter.node->finish(). This routine simply moves iter up
+ // in the tree to a valid location.
+ // Requires: iter.node is non-null.
+ template <typename IterType>
+ static IterType internal_last(IterType iter);
+
+ // Returns an iterator pointing to the leaf position at which key would
+ // reside in the tree, unless there is an exact match - in which case, the
+ // result may not be on a leaf. When there's a three-way comparator, we can
+ // return whether there was an exact match. This allows the caller to avoid a
+ // subsequent comparison to determine if an exact match was made, which is
+ // important for keys with expensive comparison, such as strings.
+ template <typename K>
+ SearchResult<iterator, is_key_compare_to::value> internal_locate(
+ const K &key) const;
+
+ // Internal routine which implements lower_bound().
+ template <typename K>
+ SearchResult<iterator, is_key_compare_to::value> internal_lower_bound(
+ const K &key) const;
+
+ // Internal routine which implements upper_bound().
+ template <typename K>
+ iterator internal_upper_bound(const K &key) const;
+
+ // Internal routine which implements find().
+ template <typename K>
+ iterator internal_find(const K &key) const;
+
+ // Verifies the tree structure of node.
+ int internal_verify(const node_type *node, const key_type *lo,
+ const key_type *hi) const;
+
+ node_stats internal_stats(const node_type *node) const {
+ // The root can be a static empty node.
+ if (node == nullptr || (node == root() && empty())) {
+ return node_stats(0, 0);
+ }
+ if (node->leaf()) {
+ return node_stats(1, 0);
+ }
+ node_stats res(0, 1);
+ for (int i = node->start(); i <= node->finish(); ++i) {
+ res += internal_stats(node->child(i));
+ }
+ return res;
+ }
+
+ // We use compressed tuple in order to save space because key_compare and
+ // allocator_type are usually empty.
+ absl::container_internal::CompressedTuple<key_compare, allocator_type,
+ node_type *>
+ root_;
+
+ // A pointer to the rightmost node. Note that the leftmost node is stored as
+ // the root's parent.
+ node_type *rightmost_;
+
+ // Number of values.
+ size_type size_;
+};
+
+////
+// btree_node methods
+template <typename P>
+template <typename... Args>
+inline void btree_node<P>::emplace_value(const size_type i,
+ allocator_type *alloc,
+ Args &&... args) {
+ assert(i >= start());
+ assert(i <= finish());
+ // Shift old values to create space for new value and then construct it in
+ // place.
+ if (i < finish()) {
+ transfer_n_backward(finish() - i, /*dest_i=*/i + 1, /*src_i=*/i, this,
+ alloc);
+ }
+ value_init(i, alloc, std::forward<Args>(args)...);
+ set_finish(finish() + 1);
+
+ if (!leaf() && finish() > i + 1) {
+ for (int j = finish(); j > i + 1; --j) {
+ set_child(j, child(j - 1));
+ }
+ clear_child(i + 1);
+ }
+}
+
+template <typename P>
+inline void btree_node<P>::remove_values(const field_type i,
+ const field_type to_erase,
+ allocator_type *alloc) {
+ // Transfer values after the removed range into their new places.
+ value_destroy_n(i, to_erase, alloc);
+ const field_type orig_finish = finish();
+ const field_type src_i = i + to_erase;
+ transfer_n(orig_finish - src_i, i, src_i, this, alloc);
+
+ if (!leaf()) {
+ // Delete all children between begin and end.
+ for (int j = 0; j < to_erase; ++j) {
+ clear_and_delete(child(i + j + 1), alloc);
+ }
+ // Rotate children after end into new positions.
+ for (int j = i + to_erase + 1; j <= orig_finish; ++j) {
+ set_child(j - to_erase, child(j));
+ clear_child(j);
+ }
+ }
+ set_finish(orig_finish - to_erase);
+}
+
+template <typename P>
+void btree_node<P>::rebalance_right_to_left(const int to_move,
+ btree_node *right,
+ allocator_type *alloc) {
+ assert(parent() == right->parent());
+ assert(position() + 1 == right->position());
+ assert(right->count() >= count());
+ assert(to_move >= 1);
+ assert(to_move <= right->count());
+
+ // 1) Move the delimiting value in the parent to the left node.
+ transfer(finish(), position(), parent(), alloc);
+
+ // 2) Move the (to_move - 1) values from the right node to the left node.
+ transfer_n(to_move - 1, finish() + 1, right->start(), right, alloc);
+
+ // 3) Move the new delimiting value to the parent from the right node.
+ parent()->transfer(position(), right->start() + to_move - 1, right, alloc);
+
+ // 4) Shift the values in the right node to their correct positions.
+ right->transfer_n(right->count() - to_move, right->start(),
+ right->start() + to_move, right, alloc);
+
+ if (!leaf()) {
+ // Move the child pointers from the right to the left node.
+ for (int i = 0; i < to_move; ++i) {
+ init_child(finish() + i + 1, right->child(i));
+ }
+ for (int i = right->start(); i <= right->finish() - to_move; ++i) {
+ assert(i + to_move <= right->max_count());
+ right->init_child(i, right->child(i + to_move));
+ right->clear_child(i + to_move);
+ }
+ }
+
+ // Fixup `finish` on the left and right nodes.
+ set_finish(finish() + to_move);
+ right->set_finish(right->finish() - to_move);
+}
+
+template <typename P>
+void btree_node<P>::rebalance_left_to_right(const int to_move,
+ btree_node *right,
+ allocator_type *alloc) {
+ assert(parent() == right->parent());
+ assert(position() + 1 == right->position());
+ assert(count() >= right->count());
+ assert(to_move >= 1);
+ assert(to_move <= count());
+
+ // Values in the right node are shifted to the right to make room for the
+ // new to_move values. Then, the delimiting value in the parent and the
+ // other (to_move - 1) values in the left node are moved into the right node.
+ // Lastly, a new delimiting value is moved from the left node into the
+ // parent, and the remaining empty left node entries are destroyed.
+
+ // 1) Shift existing values in the right node to their correct positions.
+ right->transfer_n_backward(right->count(), right->start() + to_move,
+ right->start(), right, alloc);
+
+ // 2) Move the delimiting value in the parent to the right node.
+ right->transfer(right->start() + to_move - 1, position(), parent(), alloc);
+
+ // 3) Move the (to_move - 1) values from the left node to the right node.
+ right->transfer_n(to_move - 1, right->start(), finish() - (to_move - 1), this,
+ alloc);
+
+ // 4) Move the new delimiting value to the parent from the left node.
+ parent()->transfer(position(), finish() - to_move, this, alloc);
+
+ if (!leaf()) {
+ // Move the child pointers from the left to the right node.
+ for (int i = right->finish(); i >= right->start(); --i) {
+ right->init_child(i + to_move, right->child(i));
+ right->clear_child(i);
+ }
+ for (int i = 1; i <= to_move; ++i) {
+ right->init_child(i - 1, child(finish() - to_move + i));
+ clear_child(finish() - to_move + i);
+ }
+ }
+
+ // Fixup the counts on the left and right nodes.
+ set_finish(finish() - to_move);
+ right->set_finish(right->finish() + to_move);
+}
+
+template <typename P>
+void btree_node<P>::split(const int insert_position, btree_node *dest,
+ allocator_type *alloc) {
+ assert(dest->count() == 0);
+ assert(max_count() == kNodeValues);
+
+ // We bias the split based on the position being inserted. If we're
+ // inserting at the beginning of the left node then bias the split to put
+ // more values on the right node. If we're inserting at the end of the
+ // right node then bias the split to put more values on the left node.
+ if (insert_position == start()) {
+ dest->set_finish(dest->start() + finish() - 1);
+ } else if (insert_position == kNodeValues) {
+ dest->set_finish(dest->start());
+ } else {
+ dest->set_finish(dest->start() + count() / 2);
+ }
+ set_finish(finish() - dest->count());
+ assert(count() >= 1);
+
+ // Move values from the left sibling to the right sibling.
+ dest->transfer_n(dest->count(), dest->start(), finish(), this, alloc);
+
+ // The split key is the largest value in the left sibling.
+ --mutable_finish();
+ parent()->emplace_value(position(), alloc, finish_slot());
+ value_destroy(finish(), alloc);
+ parent()->init_child(position() + 1, dest);
+
+ if (!leaf()) {
+ for (int i = dest->start(), j = finish() + 1; i <= dest->finish();
+ ++i, ++j) {
+ assert(child(j) != nullptr);
+ dest->init_child(i, child(j));
+ clear_child(j);
+ }
+ }
+}
+
+template <typename P>
+void btree_node<P>::merge(btree_node *src, allocator_type *alloc) {
+ assert(parent() == src->parent());
+ assert(position() + 1 == src->position());
+
+ // Move the delimiting value to the left node.
+ value_init(finish(), alloc, parent()->slot(position()));
+
+ // Move the values from the right to the left node.
+ transfer_n(src->count(), finish() + 1, src->start(), src, alloc);
+
+ if (!leaf()) {
+ // Move the child pointers from the right to the left node.
+ for (int i = src->start(), j = finish() + 1; i <= src->finish(); ++i, ++j) {
+ init_child(j, src->child(i));
+ src->clear_child(i);
+ }
+ }
+
+ // Fixup `finish` on the src and dest nodes.
+ set_finish(start() + 1 + count() + src->count());
+ src->set_finish(src->start());
+
+ // Remove the value on the parent node and delete the src node.
+ parent()->remove_values(position(), /*to_erase=*/1, alloc);
+}
+
+template <typename P>
+void btree_node<P>::clear_and_delete(btree_node *node, allocator_type *alloc) {
+ if (node->leaf()) {
+ node->value_destroy_n(node->start(), node->count(), alloc);
+ deallocate(LeafSize(node->max_count()), node, alloc);
+ return;
+ }
+ if (node->count() == 0) {
+ deallocate(InternalSize(), node, alloc);
+ return;
+ }
+
+ // The parent of the root of the subtree we are deleting.
+ btree_node *delete_root_parent = node->parent();
+
+ // Navigate to the leftmost leaf under node, and then delete upwards.
+ while (!node->leaf()) node = node->start_child();
+ // Use `int` because `pos` needs to be able to hold `kNodeValues+1`, which
+ // isn't guaranteed to be a valid `field_type`.
+ int pos = node->position();
+ btree_node *parent = node->parent();
+ for (;;) {
+ // In each iteration of the next loop, we delete one leaf node and go right.
+ assert(pos <= parent->finish());
+ do {
+ node = parent->child(pos);
+ if (!node->leaf()) {
+ // Navigate to the leftmost leaf under node.
+ while (!node->leaf()) node = node->start_child();
+ pos = node->position();
+ parent = node->parent();
+ }
+ node->value_destroy_n(node->start(), node->count(), alloc);
+ deallocate(LeafSize(node->max_count()), node, alloc);
+ ++pos;
+ } while (pos <= parent->finish());
+
+ // Once we've deleted all children of parent, delete parent and go up/right.
+ assert(pos > parent->finish());
+ do {
+ node = parent;
+ pos = node->position();
+ parent = node->parent();
+ node->value_destroy_n(node->start(), node->count(), alloc);
+ deallocate(InternalSize(), node, alloc);
+ if (parent == delete_root_parent) return;
+ ++pos;
+ } while (pos > parent->finish());
+ }
+}
+
+////
+// btree_iterator methods
+template <typename N, typename R, typename P>
+void btree_iterator<N, R, P>::increment_slow() {
+ if (node->leaf()) {
+ assert(position >= node->finish());
+ btree_iterator save(*this);
+ while (position == node->finish() && !node->is_root()) {
+ assert(node->parent()->child(node->position()) == node);
+ position = node->position();
+ node = node->parent();
+ }
+ // TODO(ezb): assert we aren't incrementing end() instead of handling.
+ if (position == node->finish()) {
+ *this = save;
+ }
+ } else {
+ assert(position < node->finish());
+ node = node->child(position + 1);
+ while (!node->leaf()) {
+ node = node->start_child();
+ }
+ position = node->start();
+ }
+}
+
+template <typename N, typename R, typename P>
+void btree_iterator<N, R, P>::decrement_slow() {
+ if (node->leaf()) {
+ assert(position <= -1);
+ btree_iterator save(*this);
+ while (position < node->start() && !node->is_root()) {
+ assert(node->parent()->child(node->position()) == node);
+ position = node->position() - 1;
+ node = node->parent();
+ }
+ // TODO(ezb): assert we aren't decrementing begin() instead of handling.
+ if (position < node->start()) {
+ *this = save;
+ }
+ } else {
+ assert(position >= node->start());
+ node = node->child(position);
+ while (!node->leaf()) {
+ node = node->child(node->finish());
+ }
+ position = node->finish() - 1;
+ }
+}
+
+////
+// btree methods
+template <typename P>
+template <typename Btree>
+void btree<P>::copy_or_move_values_in_order(Btree &other) {
+ static_assert(std::is_same<btree, Btree>::value ||
+ std::is_same<const btree, Btree>::value,
+ "Btree type must be same or const.");
+ assert(empty());
+
+ // We can avoid key comparisons because we know the order of the
+ // values is the same order we'll store them in.
+ auto iter = other.begin();
+ if (iter == other.end()) return;
+ insert_multi(maybe_move_from_iterator(iter));
+ ++iter;
+ for (; iter != other.end(); ++iter) {
+ // If the btree is not empty, we can just insert the new value at the end
+ // of the tree.
+ internal_emplace(end(), maybe_move_from_iterator(iter));
+ }
+}
+
+template <typename P>
+constexpr bool btree<P>::static_assert_validation() {
+ static_assert(std::is_nothrow_copy_constructible<key_compare>::value,
+ "Key comparison must be nothrow copy constructible");
+ static_assert(std::is_nothrow_copy_constructible<allocator_type>::value,
+ "Allocator must be nothrow copy constructible");
+ static_assert(type_traits_internal::is_trivially_copyable<iterator>::value,
+ "iterator not trivially copyable.");
+
+ // Note: We assert that kTargetValues, which is computed from
+ // Params::kTargetNodeSize, must fit the node_type::field_type.
+ static_assert(
+ kNodeValues < (1 << (8 * sizeof(typename node_type::field_type))),
+ "target node size too large");
+
+ // Verify that key_compare returns an absl::{weak,strong}_ordering or bool.
+ using compare_result_type =
+ absl::result_of_t<key_compare(key_type, key_type)>;
+ static_assert(
+ std::is_same<compare_result_type, bool>::value ||
+ std::is_convertible<compare_result_type, absl::weak_ordering>::value,
+ "key comparison function must return absl::{weak,strong}_ordering or "
+ "bool.");
+
+ // Test the assumption made in setting kNodeValueSpace.
+ static_assert(node_type::MinimumOverhead() >= sizeof(void *) + 4,
+ "node space assumption incorrect");
+
+ return true;
+}
+
+template <typename P>
+template <typename K>
+auto btree<P>::equal_range(const K &key) -> std::pair<iterator, iterator> {
+ const SearchResult<iterator, is_key_compare_to::value> res =
+ internal_lower_bound(key);
+ const iterator lower = internal_end(res.value);
+ if (res.HasMatch() ? !res.IsEq()
+ : lower == end() || compare_keys(key, lower.key())) {
+ return {lower, lower};
+ }
+
+ const iterator next = std::next(lower);
+ // When the comparator is heterogeneous, we can't assume that comparison with
+ // non-`key_type` will be equivalent to `key_type` comparisons so there
+ // could be multiple equivalent keys even in a unique-container. But for
+ // heterogeneous comparisons from the default string adapted comparators, we
+ // don't need to worry about this.
+ if (!is_multi_container::value &&
+ (std::is_same<K, key_type>::value || is_key_compare_adapted::value)) {
+ // The next iterator after lower must point to a key greater than `key`.
+ // Note: if this assert fails, then it may indicate that the comparator does
+ // not meet the equivalence requirements for Compare
+ // (see https://en.cppreference.com/w/cpp/named_req/Compare).
+ assert(next == end() || compare_keys(key, next.key()));
+ return {lower, next};
+ }
+ // Try once more to avoid the call to upper_bound() if there's only one
+ // equivalent key. This should prevent all calls to upper_bound() in cases of
+ // unique-containers with heterogeneous comparators in which all comparison
+ // operators have the same equivalence classes.
+ if (next == end() || compare_keys(key, next.key())) return {lower, next};
+
+ // In this case, we need to call upper_bound() to avoid worst case O(N)
+ // behavior if we were to iterate over equal keys.
+ return {lower, upper_bound(key)};
+}
+
+template <typename P>
+template <typename K, typename... Args>
+auto btree<P>::insert_unique(const K &key, Args &&... args)
+ -> std::pair<iterator, bool> {
+ if (empty()) {
+ mutable_root() = rightmost_ = new_leaf_root_node(1);
+ }
+
+ SearchResult<iterator, is_key_compare_to::value> res = internal_locate(key);
+ iterator iter = res.value;
+
+ if (res.HasMatch()) {
+ if (res.IsEq()) {
+ // The key already exists in the tree, do nothing.
+ return {iter, false};
+ }
+ } else {
+ iterator last = internal_last(iter);
+ if (last.node && !compare_keys(key, last.key())) {
+ // The key already exists in the tree, do nothing.
+ return {last, false};
+ }
+ }
+ return {internal_emplace(iter, std::forward<Args>(args)...), true};
+}
+
+template <typename P>
+template <typename K, typename... Args>
+inline auto btree<P>::insert_hint_unique(iterator position, const K &key,
+ Args &&... args)
+ -> std::pair<iterator, bool> {
+ if (!empty()) {
+ if (position == end() || compare_keys(key, position.key())) {
+ if (position == begin() || compare_keys(std::prev(position).key(), key)) {
+ // prev.key() < key < position.key()
+ return {internal_emplace(position, std::forward<Args>(args)...), true};
+ }
+ } else if (compare_keys(position.key(), key)) {
+ ++position;
+ if (position == end() || compare_keys(key, position.key())) {
+ // {original `position`}.key() < key < {current `position`}.key()
+ return {internal_emplace(position, std::forward<Args>(args)...), true};
+ }
+ } else {
+ // position.key() == key
+ return {position, false};
+ }
+ }
+ return insert_unique(key, std::forward<Args>(args)...);
+}
+
+template <typename P>
+template <typename InputIterator, typename>
+void btree<P>::insert_iterator_unique(InputIterator b, InputIterator e, int) {
+ for (; b != e; ++b) {
+ insert_hint_unique(end(), params_type::key(*b), *b);
+ }
+}
+
+template <typename P>
+template <typename InputIterator>
+void btree<P>::insert_iterator_unique(InputIterator b, InputIterator e, char) {
+ for (; b != e; ++b) {
+ init_type value(*b);
+ insert_hint_unique(end(), params_type::key(value), std::move(value));
+ }
+}
+
+template <typename P>
+template <typename ValueType>
+auto btree<P>::insert_multi(const key_type &key, ValueType &&v) -> iterator {
+ if (empty()) {
+ mutable_root() = rightmost_ = new_leaf_root_node(1);
+ }
+
+ iterator iter = internal_upper_bound(key);
+ if (iter.node == nullptr) {
+ iter = end();
+ }
+ return internal_emplace(iter, std::forward<ValueType>(v));
+}
+
+template <typename P>
+template <typename ValueType>
+auto btree<P>::insert_hint_multi(iterator position, ValueType &&v) -> iterator {
+ if (!empty()) {
+ const key_type &key = params_type::key(v);
+ if (position == end() || !compare_keys(position.key(), key)) {
+ if (position == begin() ||
+ !compare_keys(key, std::prev(position).key())) {
+ // prev.key() <= key <= position.key()
+ return internal_emplace(position, std::forward<ValueType>(v));
+ }
+ } else {
+ ++position;
+ if (position == end() || !compare_keys(position.key(), key)) {
+ // {original `position`}.key() < key < {current `position`}.key()
+ return internal_emplace(position, std::forward<ValueType>(v));
+ }
+ }
+ }
+ return insert_multi(std::forward<ValueType>(v));
+}
+
+template <typename P>
+template <typename InputIterator>
+void btree<P>::insert_iterator_multi(InputIterator b, InputIterator e) {
+ for (; b != e; ++b) {
+ insert_hint_multi(end(), *b);
+ }
+}
+
+template <typename P>
+auto btree<P>::operator=(const btree &other) -> btree & {
+ if (this != &other) {
+ clear();
+
+ *mutable_key_comp() = other.key_comp();
+ if (absl::allocator_traits<
+ allocator_type>::propagate_on_container_copy_assignment::value) {
+ *mutable_allocator() = other.allocator();
+ }
+
+ copy_or_move_values_in_order(other);
+ }
+ return *this;
+}
+
+template <typename P>
+auto btree<P>::operator=(btree &&other) noexcept -> btree & {
+ if (this != &other) {
+ clear();
+
+ using std::swap;
+ if (absl::allocator_traits<
+ allocator_type>::propagate_on_container_copy_assignment::value) {
+ // Note: `root_` also contains the allocator and the key comparator.
+ swap(root_, other.root_);
+ swap(rightmost_, other.rightmost_);
+ swap(size_, other.size_);
+ } else {
+ if (allocator() == other.allocator()) {
+ swap(mutable_root(), other.mutable_root());
+ swap(*mutable_key_comp(), *other.mutable_key_comp());
+ swap(rightmost_, other.rightmost_);
+ swap(size_, other.size_);
+ } else {
+ // We aren't allowed to propagate the allocator and the allocator is
+ // different so we can't take over its memory. We must move each element
+ // individually. We need both `other` and `this` to have `other`s key
+ // comparator while moving the values so we can't swap the key
+ // comparators.
+ *mutable_key_comp() = other.key_comp();
+ copy_or_move_values_in_order(other);
+ }
+ }
+ }
+ return *this;
+}
+
+template <typename P>
+auto btree<P>::erase(iterator iter) -> iterator {
+ bool internal_delete = false;
+ if (!iter.node->leaf()) {
+ // Deletion of a value on an internal node. First, move the largest value
+ // from our left child here, then delete that position (in remove_values()
+ // below). We can get to the largest value from our left child by
+ // decrementing iter.
+ iterator internal_iter(iter);
+ --iter;
+ assert(iter.node->leaf());
+ params_type::move(mutable_allocator(), iter.node->slot(iter.position),
+ internal_iter.node->slot(internal_iter.position));
+ internal_delete = true;
+ }
+
+ // Delete the key from the leaf.
+ iter.node->remove_values(iter.position, /*to_erase=*/1, mutable_allocator());
+ --size_;
+
+ // We want to return the next value after the one we just erased. If we
+ // erased from an internal node (internal_delete == true), then the next
+ // value is ++(++iter). If we erased from a leaf node (internal_delete ==
+ // false) then the next value is ++iter. Note that ++iter may point to an
+ // internal node and the value in the internal node may move to a leaf node
+ // (iter.node) when rebalancing is performed at the leaf level.
+
+ iterator res = rebalance_after_delete(iter);
+
+ // If we erased from an internal node, advance the iterator.
+ if (internal_delete) {
+ ++res;
+ }
+ return res;
+}
+
+template <typename P>
+auto btree<P>::rebalance_after_delete(iterator iter) -> iterator {
+ // Merge/rebalance as we walk back up the tree.
+ iterator res(iter);
+ bool first_iteration = true;
+ for (;;) {
+ if (iter.node == root()) {
+ try_shrink();
+ if (empty()) {
+ return end();
+ }
+ break;
+ }
+ if (iter.node->count() >= kMinNodeValues) {
+ break;
+ }
+ bool merged = try_merge_or_rebalance(&iter);
+ // On the first iteration, we should update `res` with `iter` because `res`
+ // may have been invalidated.
+ if (first_iteration) {
+ res = iter;
+ first_iteration = false;
+ }
+ if (!merged) {
+ break;
+ }
+ iter.position = iter.node->position();
+ iter.node = iter.node->parent();
+ }
+
+ // Adjust our return value. If we're pointing at the end of a node, advance
+ // the iterator.
+ if (res.position == res.node->finish()) {
+ res.position = res.node->finish() - 1;
+ ++res;
+ }
+
+ return res;
+}
+
+template <typename P>
+auto btree<P>::erase_range(iterator begin, iterator end)
+ -> std::pair<size_type, iterator> {
+ difference_type count = std::distance(begin, end);
+ assert(count >= 0);
+
+ if (count == 0) {
+ return {0, begin};
+ }
+
+ if (count == size_) {
+ clear();
+ return {count, this->end()};
+ }
+
+ if (begin.node == end.node) {
+ assert(end.position > begin.position);
+ begin.node->remove_values(begin.position, end.position - begin.position,
+ mutable_allocator());
+ size_ -= count;
+ return {count, rebalance_after_delete(begin)};
+ }
+
+ const size_type target_size = size_ - count;
+ while (size_ > target_size) {
+ if (begin.node->leaf()) {
+ const size_type remaining_to_erase = size_ - target_size;
+ const size_type remaining_in_node = begin.node->finish() - begin.position;
+ const size_type to_erase =
+ (std::min)(remaining_to_erase, remaining_in_node);
+ begin.node->remove_values(begin.position, to_erase, mutable_allocator());
+ size_ -= to_erase;
+ begin = rebalance_after_delete(begin);
+ } else {
+ begin = erase(begin);
+ }
+ }
+ return {count, begin};
+}
+
+template <typename P>
+void btree<P>::clear() {
+ if (!empty()) {
+ node_type::clear_and_delete(root(), mutable_allocator());
+ }
+ mutable_root() = EmptyNode();
+ rightmost_ = EmptyNode();
+ size_ = 0;
+}
+
+template <typename P>
+void btree<P>::swap(btree &other) {
+ using std::swap;
+ if (absl::allocator_traits<
+ allocator_type>::propagate_on_container_swap::value) {
+ // Note: `root_` also contains the allocator and the key comparator.
+ swap(root_, other.root_);
+ } else {
+ // It's undefined behavior if the allocators are unequal here.
+ assert(allocator() == other.allocator());
+ swap(mutable_root(), other.mutable_root());
+ swap(*mutable_key_comp(), *other.mutable_key_comp());
+ }
+ swap(rightmost_, other.rightmost_);
+ swap(size_, other.size_);
+}
+
+template <typename P>
+void btree<P>::verify() const {
+ assert(root() != nullptr);
+ assert(leftmost() != nullptr);
+ assert(rightmost_ != nullptr);
+ assert(empty() || size() == internal_verify(root(), nullptr, nullptr));
+ assert(leftmost() == (++const_iterator(root(), -1)).node);
+ assert(rightmost_ == (--const_iterator(root(), root()->finish())).node);
+ assert(leftmost()->leaf());
+ assert(rightmost_->leaf());
+}
+
+template <typename P>
+void btree<P>::rebalance_or_split(iterator *iter) {
+ node_type *&node = iter->node;
+ int &insert_position = iter->position;
+ assert(node->count() == node->max_count());
+ assert(kNodeValues == node->max_count());
+
+ // First try to make room on the node by rebalancing.
+ node_type *parent = node->parent();
+ if (node != root()) {
+ if (node->position() > parent->start()) {
+ // Try rebalancing with our left sibling.
+ node_type *left = parent->child(node->position() - 1);
+ assert(left->max_count() == kNodeValues);
+ if (left->count() < kNodeValues) {
+ // We bias rebalancing based on the position being inserted. If we're
+ // inserting at the end of the right node then we bias rebalancing to
+ // fill up the left node.
+ int to_move = (kNodeValues - left->count()) /
+ (1 + (insert_position < static_cast<int>(kNodeValues)));
+ to_move = (std::max)(1, to_move);
+
+ if (insert_position - to_move >= node->start() ||
+ left->count() + to_move < static_cast<int>(kNodeValues)) {
+ left->rebalance_right_to_left(to_move, node, mutable_allocator());
+
+ assert(node->max_count() - node->count() == to_move);
+ insert_position = insert_position - to_move;
+ if (insert_position < node->start()) {
+ insert_position = insert_position + left->count() + 1;
+ node = left;
+ }
+
+ assert(node->count() < node->max_count());
+ return;
+ }
+ }
+ }
+
+ if (node->position() < parent->finish()) {
+ // Try rebalancing with our right sibling.
+ node_type *right = parent->child(node->position() + 1);
+ assert(right->max_count() == kNodeValues);
+ if (right->count() < kNodeValues) {
+ // We bias rebalancing based on the position being inserted. If we're
+ // inserting at the beginning of the left node then we bias rebalancing
+ // to fill up the right node.
+ int to_move = (static_cast<int>(kNodeValues) - right->count()) /
+ (1 + (insert_position > node->start()));
+ to_move = (std::max)(1, to_move);
+
+ if (insert_position <= node->finish() - to_move ||
+ right->count() + to_move < static_cast<int>(kNodeValues)) {
+ node->rebalance_left_to_right(to_move, right, mutable_allocator());
+
+ if (insert_position > node->finish()) {
+ insert_position = insert_position - node->count() - 1;
+ node = right;
+ }
+
+ assert(node->count() < node->max_count());
+ return;
+ }
+ }
+ }
+
+ // Rebalancing failed, make sure there is room on the parent node for a new
+ // value.
+ assert(parent->max_count() == kNodeValues);
+ if (parent->count() == kNodeValues) {
+ iterator parent_iter(node->parent(), node->position());
+ rebalance_or_split(&parent_iter);
+ }
+ } else {
+ // Rebalancing not possible because this is the root node.
+ // Create a new root node and set the current root node as the child of the
+ // new root.
+ parent = new_internal_node(parent);
+ parent->init_child(parent->start(), root());
+ mutable_root() = parent;
+ // If the former root was a leaf node, then it's now the rightmost node.
+ assert(!parent->start_child()->leaf() ||
+ parent->start_child() == rightmost_);
+ }
+
+ // Split the node.
+ node_type *split_node;
+ if (node->leaf()) {
+ split_node = new_leaf_node(parent);
+ node->split(insert_position, split_node, mutable_allocator());
+ if (rightmost_ == node) rightmost_ = split_node;
+ } else {
+ split_node = new_internal_node(parent);
+ node->split(insert_position, split_node, mutable_allocator());
+ }
+
+ if (insert_position > node->finish()) {
+ insert_position = insert_position - node->count() - 1;
+ node = split_node;
+ }
+}
+
+template <typename P>
+void btree<P>::merge_nodes(node_type *left, node_type *right) {
+ left->merge(right, mutable_allocator());
+ if (rightmost_ == right) rightmost_ = left;
+}
+
+template <typename P>
+bool btree<P>::try_merge_or_rebalance(iterator *iter) {
+ node_type *parent = iter->node->parent();
+ if (iter->node->position() > parent->start()) {
+ // Try merging with our left sibling.
+ node_type *left = parent->child(iter->node->position() - 1);
+ assert(left->max_count() == kNodeValues);
+ if (1U + left->count() + iter->node->count() <= kNodeValues) {
+ iter->position += 1 + left->count();
+ merge_nodes(left, iter->node);
+ iter->node = left;
+ return true;
+ }
+ }
+ if (iter->node->position() < parent->finish()) {
+ // Try merging with our right sibling.
+ node_type *right = parent->child(iter->node->position() + 1);
+ assert(right->max_count() == kNodeValues);
+ if (1U + iter->node->count() + right->count() <= kNodeValues) {
+ merge_nodes(iter->node, right);
+ return true;
+ }
+ // Try rebalancing with our right sibling. We don't perform rebalancing if
+ // we deleted the first element from iter->node and the node is not
+ // empty. This is a small optimization for the common pattern of deleting
+ // from the front of the tree.
+ if (right->count() > kMinNodeValues &&
+ (iter->node->count() == 0 || iter->position > iter->node->start())) {
+ int to_move = (right->count() - iter->node->count()) / 2;
+ to_move = (std::min)(to_move, right->count() - 1);
+ iter->node->rebalance_right_to_left(to_move, right, mutable_allocator());
+ return false;
+ }
+ }
+ if (iter->node->position() > parent->start()) {
+ // Try rebalancing with our left sibling. We don't perform rebalancing if
+ // we deleted the last element from iter->node and the node is not
+ // empty. This is a small optimization for the common pattern of deleting
+ // from the back of the tree.
+ node_type *left = parent->child(iter->node->position() - 1);
+ if (left->count() > kMinNodeValues &&
+ (iter->node->count() == 0 || iter->position < iter->node->finish())) {
+ int to_move = (left->count() - iter->node->count()) / 2;
+ to_move = (std::min)(to_move, left->count() - 1);
+ left->rebalance_left_to_right(to_move, iter->node, mutable_allocator());
+ iter->position += to_move;
+ return false;
+ }
+ }
+ return false;
+}
+
+template <typename P>
+void btree<P>::try_shrink() {
+ node_type *orig_root = root();
+ if (orig_root->count() > 0) {
+ return;
+ }
+ // Deleted the last item on the root node, shrink the height of the tree.
+ if (orig_root->leaf()) {
+ assert(size() == 0);
+ mutable_root() = rightmost_ = EmptyNode();
+ } else {
+ node_type *child = orig_root->start_child();
+ child->make_root();
+ mutable_root() = child;
+ }
+ node_type::clear_and_delete(orig_root, mutable_allocator());
+}
+
+template <typename P>
+template <typename IterType>
+inline IterType btree<P>::internal_last(IterType iter) {
+ assert(iter.node != nullptr);
+ while (iter.position == iter.node->finish()) {
+ iter.position = iter.node->position();
+ iter.node = iter.node->parent();
+ if (iter.node->leaf()) {
+ iter.node = nullptr;
+ break;
+ }
+ }
+ return iter;
+}
+
+template <typename P>
+template <typename... Args>
+inline auto btree<P>::internal_emplace(iterator iter, Args &&... args)
+ -> iterator {
+ if (!iter.node->leaf()) {
+ // We can't insert on an internal node. Instead, we'll insert after the
+ // previous value which is guaranteed to be on a leaf node.
+ --iter;
+ ++iter.position;
+ }
+ const field_type max_count = iter.node->max_count();
+ allocator_type *alloc = mutable_allocator();
+ if (iter.node->count() == max_count) {
+ // Make room in the leaf for the new item.
+ if (max_count < kNodeValues) {
+ // Insertion into the root where the root is smaller than the full node
+ // size. Simply grow the size of the root node.
+ assert(iter.node == root());
+ iter.node =
+ new_leaf_root_node((std::min<int>)(kNodeValues, 2 * max_count));
+ // Transfer the values from the old root to the new root.
+ node_type *old_root = root();
+ node_type *new_root = iter.node;
+ new_root->transfer_n(old_root->count(), new_root->start(),
+ old_root->start(), old_root, alloc);
+ new_root->set_finish(old_root->finish());
+ old_root->set_finish(old_root->start());
+ node_type::clear_and_delete(old_root, alloc);
+ mutable_root() = rightmost_ = new_root;
+ } else {
+ rebalance_or_split(&iter);
+ }
+ }
+ iter.node->emplace_value(iter.position, alloc, std::forward<Args>(args)...);
+ ++size_;
+ return iter;
+}
+
+template <typename P>
+template <typename K>
+inline auto btree<P>::internal_locate(const K &key) const
+ -> SearchResult<iterator, is_key_compare_to::value> {
+ iterator iter(const_cast<node_type *>(root()));
+ for (;;) {
+ SearchResult<int, is_key_compare_to::value> res =
+ iter.node->lower_bound(key, key_comp());
+ iter.position = res.value;
+ if (res.IsEq()) {
+ return {iter, MatchKind::kEq};
+ }
+ // Note: in the non-key-compare-to case, we don't need to walk all the way
+ // down the tree if the keys are equal, but determining equality would
+ // require doing an extra comparison on each node on the way down, and we
+ // will need to go all the way to the leaf node in the expected case.
+ if (iter.node->leaf()) {
+ break;
+ }
+ iter.node = iter.node->child(iter.position);
+ }
+ // Note: in the non-key-compare-to case, the key may actually be equivalent
+ // here (and the MatchKind::kNe is ignored).
+ return {iter, MatchKind::kNe};
+}
+
+template <typename P>
+template <typename K>
+auto btree<P>::internal_lower_bound(const K &key) const
+ -> SearchResult<iterator, is_key_compare_to::value> {
+ iterator iter(const_cast<node_type *>(root()));
+ SearchResult<int, is_key_compare_to::value> res;
+ bool seen_eq = false;
+ for (;;) {
+ res = iter.node->lower_bound(key, key_comp());
+ iter.position = res.value;
+ // TODO(ezb): we should be able to terminate early on IsEq() if there can't
+ // be multiple equivalent keys in container for this lookup type.
+ if (iter.node->leaf()) {
+ break;
+ }
+ seen_eq = seen_eq || res.IsEq();
+ iter.node = iter.node->child(iter.position);
+ }
+ if (res.IsEq()) return {iter, MatchKind::kEq};
+ return {internal_last(iter), seen_eq ? MatchKind::kEq : MatchKind::kNe};
+}
+
+template <typename P>
+template <typename K>
+auto btree<P>::internal_upper_bound(const K &key) const -> iterator {
+ iterator iter(const_cast<node_type *>(root()));
+ for (;;) {
+ iter.position = iter.node->upper_bound(key, key_comp());
+ if (iter.node->leaf()) {
+ break;
+ }
+ iter.node = iter.node->child(iter.position);
+ }
+ return internal_last(iter);
+}
+
+template <typename P>
+template <typename K>
+auto btree<P>::internal_find(const K &key) const -> iterator {
+ SearchResult<iterator, is_key_compare_to::value> res = internal_locate(key);
+ if (res.HasMatch()) {
+ if (res.IsEq()) {
+ return res.value;
+ }
+ } else {
+ const iterator iter = internal_last(res.value);
+ if (iter.node != nullptr && !compare_keys(key, iter.key())) {
+ return iter;
+ }
+ }
+ return {nullptr, 0};
+}
+
+template <typename P>
+int btree<P>::internal_verify(const node_type *node, const key_type *lo,
+ const key_type *hi) const {
+ assert(node->count() > 0);
+ assert(node->count() <= node->max_count());
+ if (lo) {
+ assert(!compare_keys(node->key(node->start()), *lo));
+ }
+ if (hi) {
+ assert(!compare_keys(*hi, node->key(node->finish() - 1)));
+ }
+ for (int i = node->start() + 1; i < node->finish(); ++i) {
+ assert(!compare_keys(node->key(i), node->key(i - 1)));
+ }
+ int count = node->count();
+ if (!node->leaf()) {
+ for (int i = node->start(); i <= node->finish(); ++i) {
+ assert(node->child(i) != nullptr);
+ assert(node->child(i)->parent() == node);
+ assert(node->child(i)->position() == i);
+ count += internal_verify(node->child(i),
+ i == node->start() ? lo : &node->key(i - 1),
+ i == node->finish() ? hi : &node->key(i));
+ }
+ }
+ return count;
+}
+
+} // namespace container_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_CONTAINER_INTERNAL_BTREE_H_
diff --git a/third_party/abseil/src/absl/container/internal/btree_container.h b/third_party/abseil/src/absl/container/internal/btree_container.h
new file mode 100644
index 0000000..887eda4
--- /dev/null
+++ b/third_party/abseil/src/absl/container/internal/btree_container.h
@@ -0,0 +1,683 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_CONTAINER_INTERNAL_BTREE_CONTAINER_H_
+#define ABSL_CONTAINER_INTERNAL_BTREE_CONTAINER_H_
+
+#include <algorithm>
+#include <initializer_list>
+#include <iterator>
+#include <utility>
+
+#include "absl/base/internal/throw_delegate.h"
+#include "absl/container/internal/btree.h" // IWYU pragma: export
+#include "absl/container/internal/common.h"
+#include "absl/memory/memory.h"
+#include "absl/meta/type_traits.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace container_internal {
+
+// A common base class for btree_set, btree_map, btree_multiset, and
+// btree_multimap.
+template <typename Tree>
+class btree_container {
+ using params_type = typename Tree::params_type;
+
+ protected:
+ // Alias used for heterogeneous lookup functions.
+ // `key_arg<K>` evaluates to `K` when the functors are transparent and to
+ // `key_type` otherwise. It permits template argument deduction on `K` for the
+ // transparent case.
+ template <class K>
+ using key_arg =
+ typename KeyArg<IsTransparent<typename Tree::key_compare>::value>::
+ template type<K, typename Tree::key_type>;
+
+ public:
+ using key_type = typename Tree::key_type;
+ using value_type = typename Tree::value_type;
+ using size_type = typename Tree::size_type;
+ using difference_type = typename Tree::difference_type;
+ using key_compare = typename Tree::key_compare;
+ using value_compare = typename Tree::value_compare;
+ using allocator_type = typename Tree::allocator_type;
+ using reference = typename Tree::reference;
+ using const_reference = typename Tree::const_reference;
+ using pointer = typename Tree::pointer;
+ using const_pointer = typename Tree::const_pointer;
+ using iterator = typename Tree::iterator;
+ using const_iterator = typename Tree::const_iterator;
+ using reverse_iterator = typename Tree::reverse_iterator;
+ using const_reverse_iterator = typename Tree::const_reverse_iterator;
+ using node_type = typename Tree::node_handle_type;
+
+ // Constructors/assignments.
+ btree_container() : tree_(key_compare(), allocator_type()) {}
+ explicit btree_container(const key_compare &comp,
+ const allocator_type &alloc = allocator_type())
+ : tree_(comp, alloc) {}
+ explicit btree_container(const allocator_type &alloc)
+ : tree_(key_compare(), alloc) {}
+
+ btree_container(const btree_container &other)
+ : btree_container(other, absl::allocator_traits<allocator_type>::
+ select_on_container_copy_construction(
+ other.get_allocator())) {}
+ btree_container(const btree_container &other, const allocator_type &alloc)
+ : tree_(other.tree_, alloc) {}
+
+ btree_container(btree_container &&other) noexcept(
+ std::is_nothrow_move_constructible<Tree>::value) = default;
+ btree_container(btree_container &&other, const allocator_type &alloc)
+ : tree_(std::move(other.tree_), alloc) {}
+
+ btree_container &operator=(const btree_container &other) = default;
+ btree_container &operator=(btree_container &&other) noexcept(
+ std::is_nothrow_move_assignable<Tree>::value) = default;
+
+ // Iterator routines.
+ iterator begin() { return tree_.begin(); }
+ const_iterator begin() const { return tree_.begin(); }
+ const_iterator cbegin() const { return tree_.begin(); }
+ iterator end() { return tree_.end(); }
+ const_iterator end() const { return tree_.end(); }
+ const_iterator cend() const { return tree_.end(); }
+ reverse_iterator rbegin() { return tree_.rbegin(); }
+ const_reverse_iterator rbegin() const { return tree_.rbegin(); }
+ const_reverse_iterator crbegin() const { return tree_.rbegin(); }
+ reverse_iterator rend() { return tree_.rend(); }
+ const_reverse_iterator rend() const { return tree_.rend(); }
+ const_reverse_iterator crend() const { return tree_.rend(); }
+
+ // Lookup routines.
+ template <typename K = key_type>
+ size_type count(const key_arg<K> &key) const {
+ auto equal_range = this->equal_range(key);
+ return std::distance(equal_range.first, equal_range.second);
+ }
+ template <typename K = key_type>
+ iterator find(const key_arg<K> &key) {
+ return tree_.find(key);
+ }
+ template <typename K = key_type>
+ const_iterator find(const key_arg<K> &key) const {
+ return tree_.find(key);
+ }
+ template <typename K = key_type>
+ bool contains(const key_arg<K> &key) const {
+ return find(key) != end();
+ }
+ template <typename K = key_type>
+ iterator lower_bound(const key_arg<K> &key) {
+ return tree_.lower_bound(key);
+ }
+ template <typename K = key_type>
+ const_iterator lower_bound(const key_arg<K> &key) const {
+ return tree_.lower_bound(key);
+ }
+ template <typename K = key_type>
+ iterator upper_bound(const key_arg<K> &key) {
+ return tree_.upper_bound(key);
+ }
+ template <typename K = key_type>
+ const_iterator upper_bound(const key_arg<K> &key) const {
+ return tree_.upper_bound(key);
+ }
+ template <typename K = key_type>
+ std::pair<iterator, iterator> equal_range(const key_arg<K> &key) {
+ return tree_.equal_range(key);
+ }
+ template <typename K = key_type>
+ std::pair<const_iterator, const_iterator> equal_range(
+ const key_arg<K> &key) const {
+ return tree_.equal_range(key);
+ }
+
+ // Deletion routines. Note that there is also a deletion routine that is
+ // specific to btree_set_container/btree_multiset_container.
+
+ // Erase the specified iterator from the btree. The iterator must be valid
+ // (i.e. not equal to end()). Return an iterator pointing to the node after
+ // the one that was erased (or end() if none exists).
+ iterator erase(const_iterator iter) { return tree_.erase(iterator(iter)); }
+ iterator erase(iterator iter) { return tree_.erase(iter); }
+ iterator erase(const_iterator first, const_iterator last) {
+ return tree_.erase_range(iterator(first), iterator(last)).second;
+ }
+ template <typename K = key_type>
+ size_type erase(const key_arg<K> &key) {
+ auto equal_range = this->equal_range(key);
+ return tree_.erase_range(equal_range.first, equal_range.second).first;
+ }
+
+ // Extract routines.
+ node_type extract(iterator position) {
+ // Use Move instead of Transfer, because the rebalancing code expects to
+ // have a valid object to scribble metadata bits on top of.
+ auto node = CommonAccess::Move<node_type>(get_allocator(), position.slot());
+ erase(position);
+ return node;
+ }
+ node_type extract(const_iterator position) {
+ return extract(iterator(position));
+ }
+
+ // Utility routines.
+ void clear() { tree_.clear(); }
+ void swap(btree_container &other) { tree_.swap(other.tree_); }
+ void verify() const { tree_.verify(); }
+
+ // Size routines.
+ size_type size() const { return tree_.size(); }
+ size_type max_size() const { return tree_.max_size(); }
+ bool empty() const { return tree_.empty(); }
+
+ friend bool operator==(const btree_container &x, const btree_container &y) {
+ if (x.size() != y.size()) return false;
+ return std::equal(x.begin(), x.end(), y.begin());
+ }
+
+ friend bool operator!=(const btree_container &x, const btree_container &y) {
+ return !(x == y);
+ }
+
+ friend bool operator<(const btree_container &x, const btree_container &y) {
+ return std::lexicographical_compare(x.begin(), x.end(), y.begin(), y.end());
+ }
+
+ friend bool operator>(const btree_container &x, const btree_container &y) {
+ return y < x;
+ }
+
+ friend bool operator<=(const btree_container &x, const btree_container &y) {
+ return !(y < x);
+ }
+
+ friend bool operator>=(const btree_container &x, const btree_container &y) {
+ return !(x < y);
+ }
+
+ // The allocator used by the btree.
+ allocator_type get_allocator() const { return tree_.get_allocator(); }
+
+ // The key comparator used by the btree.
+ key_compare key_comp() const { return tree_.key_comp(); }
+ value_compare value_comp() const { return tree_.value_comp(); }
+
+ // Support absl::Hash.
+ template <typename State>
+ friend State AbslHashValue(State h, const btree_container &b) {
+ for (const auto &v : b) {
+ h = State::combine(std::move(h), v);
+ }
+ return State::combine(std::move(h), b.size());
+ }
+
+ protected:
+ Tree tree_;
+};
+
+// A common base class for btree_set and btree_map.
+template <typename Tree>
+class btree_set_container : public btree_container<Tree> {
+ using super_type = btree_container<Tree>;
+ using params_type = typename Tree::params_type;
+ using init_type = typename params_type::init_type;
+ using is_key_compare_to = typename params_type::is_key_compare_to;
+ friend class BtreeNodePeer;
+
+ protected:
+ template <class K>
+ using key_arg = typename super_type::template key_arg<K>;
+
+ public:
+ using key_type = typename Tree::key_type;
+ using value_type = typename Tree::value_type;
+ using size_type = typename Tree::size_type;
+ using key_compare = typename Tree::key_compare;
+ using allocator_type = typename Tree::allocator_type;
+ using iterator = typename Tree::iterator;
+ using const_iterator = typename Tree::const_iterator;
+ using node_type = typename super_type::node_type;
+ using insert_return_type = InsertReturnType<iterator, node_type>;
+
+ // Inherit constructors.
+ using super_type::super_type;
+ btree_set_container() {}
+
+ // Range constructors.
+ template <class InputIterator>
+ btree_set_container(InputIterator b, InputIterator e,
+ const key_compare &comp = key_compare(),
+ const allocator_type &alloc = allocator_type())
+ : super_type(comp, alloc) {
+ insert(b, e);
+ }
+ template <class InputIterator>
+ btree_set_container(InputIterator b, InputIterator e,
+ const allocator_type &alloc)
+ : btree_set_container(b, e, key_compare(), alloc) {}
+
+ // Initializer list constructors.
+ btree_set_container(std::initializer_list<init_type> init,
+ const key_compare &comp = key_compare(),
+ const allocator_type &alloc = allocator_type())
+ : btree_set_container(init.begin(), init.end(), comp, alloc) {}
+ btree_set_container(std::initializer_list<init_type> init,
+ const allocator_type &alloc)
+ : btree_set_container(init.begin(), init.end(), alloc) {}
+
+ // Insertion routines.
+ std::pair<iterator, bool> insert(const value_type &v) {
+ return this->tree_.insert_unique(params_type::key(v), v);
+ }
+ std::pair<iterator, bool> insert(value_type &&v) {
+ return this->tree_.insert_unique(params_type::key(v), std::move(v));
+ }
+ template <typename... Args>
+ std::pair<iterator, bool> emplace(Args &&... args) {
+ init_type v(std::forward<Args>(args)...);
+ return this->tree_.insert_unique(params_type::key(v), std::move(v));
+ }
+ iterator insert(const_iterator hint, const value_type &v) {
+ return this->tree_
+ .insert_hint_unique(iterator(hint), params_type::key(v), v)
+ .first;
+ }
+ iterator insert(const_iterator hint, value_type &&v) {
+ return this->tree_
+ .insert_hint_unique(iterator(hint), params_type::key(v), std::move(v))
+ .first;
+ }
+ template <typename... Args>
+ iterator emplace_hint(const_iterator hint, Args &&... args) {
+ init_type v(std::forward<Args>(args)...);
+ return this->tree_
+ .insert_hint_unique(iterator(hint), params_type::key(v), std::move(v))
+ .first;
+ }
+ template <typename InputIterator>
+ void insert(InputIterator b, InputIterator e) {
+ this->tree_.insert_iterator_unique(b, e, 0);
+ }
+ void insert(std::initializer_list<init_type> init) {
+ this->tree_.insert_iterator_unique(init.begin(), init.end(), 0);
+ }
+ insert_return_type insert(node_type &&node) {
+ if (!node) return {this->end(), false, node_type()};
+ std::pair<iterator, bool> res =
+ this->tree_.insert_unique(params_type::key(CommonAccess::GetSlot(node)),
+ CommonAccess::GetSlot(node));
+ if (res.second) {
+ CommonAccess::Destroy(&node);
+ return {res.first, true, node_type()};
+ } else {
+ return {res.first, false, std::move(node)};
+ }
+ }
+ iterator insert(const_iterator hint, node_type &&node) {
+ if (!node) return this->end();
+ std::pair<iterator, bool> res = this->tree_.insert_hint_unique(
+ iterator(hint), params_type::key(CommonAccess::GetSlot(node)),
+ CommonAccess::GetSlot(node));
+ if (res.second) CommonAccess::Destroy(&node);
+ return res.first;
+ }
+
+ // Node extraction routines.
+ // TODO(ezb): when the comparator is heterogeneous and has different
+ // equivalence classes for different lookup types, we should extract the first
+ // equivalent value if there are multiple.
+ template <typename K = key_type>
+ node_type extract(const key_arg<K> &key) {
+ auto it = this->find(key);
+ return it == this->end() ? node_type() : extract(it);
+ }
+ using super_type::extract;
+
+ // Merge routines.
+ // Moves elements from `src` into `this`. If the element already exists in
+ // `this`, it is left unmodified in `src`.
+ template <
+ typename T,
+ typename absl::enable_if_t<
+ absl::conjunction<
+ std::is_same<value_type, typename T::value_type>,
+ std::is_same<allocator_type, typename T::allocator_type>,
+ std::is_same<typename params_type::is_map_container,
+ typename T::params_type::is_map_container>>::value,
+ int> = 0>
+ void merge(btree_container<T> &src) { // NOLINT
+ for (auto src_it = src.begin(); src_it != src.end();) {
+ if (insert(std::move(params_type::element(src_it.slot()))).second) {
+ src_it = src.erase(src_it);
+ } else {
+ ++src_it;
+ }
+ }
+ }
+
+ template <
+ typename T,
+ typename absl::enable_if_t<
+ absl::conjunction<
+ std::is_same<value_type, typename T::value_type>,
+ std::is_same<allocator_type, typename T::allocator_type>,
+ std::is_same<typename params_type::is_map_container,
+ typename T::params_type::is_map_container>>::value,
+ int> = 0>
+ void merge(btree_container<T> &&src) {
+ merge(src);
+ }
+};
+
+// Base class for btree_map.
+template <typename Tree>
+class btree_map_container : public btree_set_container<Tree> {
+ using super_type = btree_set_container<Tree>;
+ using params_type = typename Tree::params_type;
+ friend class BtreeNodePeer;
+
+ private:
+ template <class K>
+ using key_arg = typename super_type::template key_arg<K>;
+
+ public:
+ using key_type = typename Tree::key_type;
+ using mapped_type = typename params_type::mapped_type;
+ using value_type = typename Tree::value_type;
+ using key_compare = typename Tree::key_compare;
+ using allocator_type = typename Tree::allocator_type;
+ using iterator = typename Tree::iterator;
+ using const_iterator = typename Tree::const_iterator;
+
+ // Inherit constructors.
+ using super_type::super_type;
+ btree_map_container() {}
+
+ // Insertion routines.
+ // Note: the nullptr template arguments and extra `const M&` overloads allow
+ // for supporting bitfield arguments.
+ template <typename K = key_type, class M>
+ std::pair<iterator, bool> insert_or_assign(const key_arg<K> &k,
+ const M &obj) {
+ return insert_or_assign_impl(k, obj);
+ }
+ template <typename K = key_type, class M, K * = nullptr>
+ std::pair<iterator, bool> insert_or_assign(key_arg<K> &&k, const M &obj) {
+ return insert_or_assign_impl(std::forward<K>(k), obj);
+ }
+ template <typename K = key_type, class M, M * = nullptr>
+ std::pair<iterator, bool> insert_or_assign(const key_arg<K> &k, M &&obj) {
+ return insert_or_assign_impl(k, std::forward<M>(obj));
+ }
+ template <typename K = key_type, class M, K * = nullptr, M * = nullptr>
+ std::pair<iterator, bool> insert_or_assign(key_arg<K> &&k, M &&obj) {
+ return insert_or_assign_impl(std::forward<K>(k), std::forward<M>(obj));
+ }
+ template <typename K = key_type, class M>
+ iterator insert_or_assign(const_iterator hint, const key_arg<K> &k,
+ const M &obj) {
+ return insert_or_assign_hint_impl(hint, k, obj);
+ }
+ template <typename K = key_type, class M, K * = nullptr>
+ iterator insert_or_assign(const_iterator hint, key_arg<K> &&k, const M &obj) {
+ return insert_or_assign_hint_impl(hint, std::forward<K>(k), obj);
+ }
+ template <typename K = key_type, class M, M * = nullptr>
+ iterator insert_or_assign(const_iterator hint, const key_arg<K> &k, M &&obj) {
+ return insert_or_assign_hint_impl(hint, k, std::forward<M>(obj));
+ }
+ template <typename K = key_type, class M, K * = nullptr, M * = nullptr>
+ iterator insert_or_assign(const_iterator hint, key_arg<K> &&k, M &&obj) {
+ return insert_or_assign_hint_impl(hint, std::forward<K>(k),
+ std::forward<M>(obj));
+ }
+
+ template <typename K = key_type, typename... Args,
+ typename absl::enable_if_t<
+ !std::is_convertible<K, const_iterator>::value, int> = 0>
+ std::pair<iterator, bool> try_emplace(const key_arg<K> &k, Args &&... args) {
+ return try_emplace_impl(k, std::forward<Args>(args)...);
+ }
+ template <typename K = key_type, typename... Args,
+ typename absl::enable_if_t<
+ !std::is_convertible<K, const_iterator>::value, int> = 0>
+ std::pair<iterator, bool> try_emplace(key_arg<K> &&k, Args &&... args) {
+ return try_emplace_impl(std::forward<K>(k), std::forward<Args>(args)...);
+ }
+ template <typename K = key_type, typename... Args>
+ iterator try_emplace(const_iterator hint, const key_arg<K> &k,
+ Args &&... args) {
+ return try_emplace_hint_impl(hint, k, std::forward<Args>(args)...);
+ }
+ template <typename K = key_type, typename... Args>
+ iterator try_emplace(const_iterator hint, key_arg<K> &&k, Args &&... args) {
+ return try_emplace_hint_impl(hint, std::forward<K>(k),
+ std::forward<Args>(args)...);
+ }
+
+ template <typename K = key_type>
+ mapped_type &operator[](const key_arg<K> &k) {
+ return try_emplace(k).first->second;
+ }
+ template <typename K = key_type>
+ mapped_type &operator[](key_arg<K> &&k) {
+ return try_emplace(std::forward<K>(k)).first->second;
+ }
+
+ template <typename K = key_type>
+ mapped_type &at(const key_arg<K> &key) {
+ auto it = this->find(key);
+ if (it == this->end())
+ base_internal::ThrowStdOutOfRange("absl::btree_map::at");
+ return it->second;
+ }
+ template <typename K = key_type>
+ const mapped_type &at(const key_arg<K> &key) const {
+ auto it = this->find(key);
+ if (it == this->end())
+ base_internal::ThrowStdOutOfRange("absl::btree_map::at");
+ return it->second;
+ }
+
+ private:
+ // Note: when we call `std::forward<M>(obj)` twice, it's safe because
+ // insert_unique/insert_hint_unique are guaranteed to not consume `obj` when
+ // `ret.second` is false.
+ template <class K, class M>
+ std::pair<iterator, bool> insert_or_assign_impl(K &&k, M &&obj) {
+ const std::pair<iterator, bool> ret =
+ this->tree_.insert_unique(k, std::forward<K>(k), std::forward<M>(obj));
+ if (!ret.second) ret.first->second = std::forward<M>(obj);
+ return ret;
+ }
+ template <class K, class M>
+ iterator insert_or_assign_hint_impl(const_iterator hint, K &&k, M &&obj) {
+ const std::pair<iterator, bool> ret = this->tree_.insert_hint_unique(
+ iterator(hint), k, std::forward<K>(k), std::forward<M>(obj));
+ if (!ret.second) ret.first->second = std::forward<M>(obj);
+ return ret.first;
+ }
+
+ template <class K, class... Args>
+ std::pair<iterator, bool> try_emplace_impl(K &&k, Args &&... args) {
+ return this->tree_.insert_unique(
+ k, std::piecewise_construct, std::forward_as_tuple(std::forward<K>(k)),
+ std::forward_as_tuple(std::forward<Args>(args)...));
+ }
+ template <class K, class... Args>
+ iterator try_emplace_hint_impl(const_iterator hint, K &&k, Args &&... args) {
+ return this->tree_
+ .insert_hint_unique(iterator(hint), k, std::piecewise_construct,
+ std::forward_as_tuple(std::forward<K>(k)),
+ std::forward_as_tuple(std::forward<Args>(args)...))
+ .first;
+ }
+};
+
+// A common base class for btree_multiset and btree_multimap.
+template <typename Tree>
+class btree_multiset_container : public btree_container<Tree> {
+ using super_type = btree_container<Tree>;
+ using params_type = typename Tree::params_type;
+ using init_type = typename params_type::init_type;
+ using is_key_compare_to = typename params_type::is_key_compare_to;
+
+ template <class K>
+ using key_arg = typename super_type::template key_arg<K>;
+
+ public:
+ using key_type = typename Tree::key_type;
+ using value_type = typename Tree::value_type;
+ using size_type = typename Tree::size_type;
+ using key_compare = typename Tree::key_compare;
+ using allocator_type = typename Tree::allocator_type;
+ using iterator = typename Tree::iterator;
+ using const_iterator = typename Tree::const_iterator;
+ using node_type = typename super_type::node_type;
+
+ // Inherit constructors.
+ using super_type::super_type;
+ btree_multiset_container() {}
+
+ // Range constructors.
+ template <class InputIterator>
+ btree_multiset_container(InputIterator b, InputIterator e,
+ const key_compare &comp = key_compare(),
+ const allocator_type &alloc = allocator_type())
+ : super_type(comp, alloc) {
+ insert(b, e);
+ }
+ template <class InputIterator>
+ btree_multiset_container(InputIterator b, InputIterator e,
+ const allocator_type &alloc)
+ : btree_multiset_container(b, e, key_compare(), alloc) {}
+
+ // Initializer list constructors.
+ btree_multiset_container(std::initializer_list<init_type> init,
+ const key_compare &comp = key_compare(),
+ const allocator_type &alloc = allocator_type())
+ : btree_multiset_container(init.begin(), init.end(), comp, alloc) {}
+ btree_multiset_container(std::initializer_list<init_type> init,
+ const allocator_type &alloc)
+ : btree_multiset_container(init.begin(), init.end(), alloc) {}
+
+ // Insertion routines.
+ iterator insert(const value_type &v) { return this->tree_.insert_multi(v); }
+ iterator insert(value_type &&v) {
+ return this->tree_.insert_multi(std::move(v));
+ }
+ iterator insert(const_iterator hint, const value_type &v) {
+ return this->tree_.insert_hint_multi(iterator(hint), v);
+ }
+ iterator insert(const_iterator hint, value_type &&v) {
+ return this->tree_.insert_hint_multi(iterator(hint), std::move(v));
+ }
+ template <typename InputIterator>
+ void insert(InputIterator b, InputIterator e) {
+ this->tree_.insert_iterator_multi(b, e);
+ }
+ void insert(std::initializer_list<init_type> init) {
+ this->tree_.insert_iterator_multi(init.begin(), init.end());
+ }
+ template <typename... Args>
+ iterator emplace(Args &&... args) {
+ return this->tree_.insert_multi(init_type(std::forward<Args>(args)...));
+ }
+ template <typename... Args>
+ iterator emplace_hint(const_iterator hint, Args &&... args) {
+ return this->tree_.insert_hint_multi(
+ iterator(hint), init_type(std::forward<Args>(args)...));
+ }
+ iterator insert(node_type &&node) {
+ if (!node) return this->end();
+ iterator res =
+ this->tree_.insert_multi(params_type::key(CommonAccess::GetSlot(node)),
+ CommonAccess::GetSlot(node));
+ CommonAccess::Destroy(&node);
+ return res;
+ }
+ iterator insert(const_iterator hint, node_type &&node) {
+ if (!node) return this->end();
+ iterator res = this->tree_.insert_hint_multi(
+ iterator(hint),
+ std::move(params_type::element(CommonAccess::GetSlot(node))));
+ CommonAccess::Destroy(&node);
+ return res;
+ }
+
+ // Node extraction routines.
+ // TODO(ezb): we are supposed to extract the first equivalent key if there are
+ // multiple, but this isn't guaranteed to extract the first one.
+ template <typename K = key_type>
+ node_type extract(const key_arg<K> &key) {
+ auto it = this->find(key);
+ return it == this->end() ? node_type() : extract(it);
+ }
+ using super_type::extract;
+
+ // Merge routines.
+ // Moves all elements from `src` into `this`.
+ template <
+ typename T,
+ typename absl::enable_if_t<
+ absl::conjunction<
+ std::is_same<value_type, typename T::value_type>,
+ std::is_same<allocator_type, typename T::allocator_type>,
+ std::is_same<typename params_type::is_map_container,
+ typename T::params_type::is_map_container>>::value,
+ int> = 0>
+ void merge(btree_container<T> &src) { // NOLINT
+ for (auto src_it = src.begin(), end = src.end(); src_it != end; ++src_it) {
+ insert(std::move(params_type::element(src_it.slot())));
+ }
+ src.clear();
+ }
+
+ template <
+ typename T,
+ typename absl::enable_if_t<
+ absl::conjunction<
+ std::is_same<value_type, typename T::value_type>,
+ std::is_same<allocator_type, typename T::allocator_type>,
+ std::is_same<typename params_type::is_map_container,
+ typename T::params_type::is_map_container>>::value,
+ int> = 0>
+ void merge(btree_container<T> &&src) {
+ merge(src);
+ }
+};
+
+// A base class for btree_multimap.
+template <typename Tree>
+class btree_multimap_container : public btree_multiset_container<Tree> {
+ using super_type = btree_multiset_container<Tree>;
+ using params_type = typename Tree::params_type;
+
+ public:
+ using mapped_type = typename params_type::mapped_type;
+
+ // Inherit constructors.
+ using super_type::super_type;
+ btree_multimap_container() {}
+};
+
+} // namespace container_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_CONTAINER_INTERNAL_BTREE_CONTAINER_H_
diff --git a/third_party/abseil/src/absl/container/internal/common.h b/third_party/abseil/src/absl/container/internal/common.h
new file mode 100644
index 0000000..030e9d4
--- /dev/null
+++ b/third_party/abseil/src/absl/container/internal/common.h
@@ -0,0 +1,206 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_CONTAINER_INTERNAL_CONTAINER_H_
+#define ABSL_CONTAINER_INTERNAL_CONTAINER_H_
+
+#include <cassert>
+#include <type_traits>
+
+#include "absl/meta/type_traits.h"
+#include "absl/types/optional.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace container_internal {
+
+template <class, class = void>
+struct IsTransparent : std::false_type {};
+template <class T>
+struct IsTransparent<T, absl::void_t<typename T::is_transparent>>
+ : std::true_type {};
+
+template <bool is_transparent>
+struct KeyArg {
+ // Transparent. Forward `K`.
+ template <typename K, typename key_type>
+ using type = K;
+};
+
+template <>
+struct KeyArg<false> {
+ // Not transparent. Always use `key_type`.
+ template <typename K, typename key_type>
+ using type = key_type;
+};
+
+// The node_handle concept from C++17.
+// We specialize node_handle for sets and maps. node_handle_base holds the
+// common API of both.
+template <typename PolicyTraits, typename Alloc>
+class node_handle_base {
+ protected:
+ using slot_type = typename PolicyTraits::slot_type;
+
+ public:
+ using allocator_type = Alloc;
+
+ constexpr node_handle_base() = default;
+ node_handle_base(node_handle_base&& other) noexcept {
+ *this = std::move(other);
+ }
+ ~node_handle_base() { destroy(); }
+ node_handle_base& operator=(node_handle_base&& other) noexcept {
+ destroy();
+ if (!other.empty()) {
+ alloc_ = other.alloc_;
+ PolicyTraits::transfer(alloc(), slot(), other.slot());
+ other.reset();
+ }
+ return *this;
+ }
+
+ bool empty() const noexcept { return !alloc_; }
+ explicit operator bool() const noexcept { return !empty(); }
+ allocator_type get_allocator() const { return *alloc_; }
+
+ protected:
+ friend struct CommonAccess;
+
+ struct transfer_tag_t {};
+ node_handle_base(transfer_tag_t, const allocator_type& a, slot_type* s)
+ : alloc_(a) {
+ PolicyTraits::transfer(alloc(), slot(), s);
+ }
+
+ struct move_tag_t {};
+ node_handle_base(move_tag_t, const allocator_type& a, slot_type* s)
+ : alloc_(a) {
+ PolicyTraits::construct(alloc(), slot(), s);
+ }
+
+ void destroy() {
+ if (!empty()) {
+ PolicyTraits::destroy(alloc(), slot());
+ reset();
+ }
+ }
+
+ void reset() {
+ assert(alloc_.has_value());
+ alloc_ = absl::nullopt;
+ }
+
+ slot_type* slot() const {
+ assert(!empty());
+ return reinterpret_cast<slot_type*>(std::addressof(slot_space_));
+ }
+ allocator_type* alloc() { return std::addressof(*alloc_); }
+
+ private:
+ absl::optional<allocator_type> alloc_ = {};
+ alignas(slot_type) mutable unsigned char slot_space_[sizeof(slot_type)] = {};
+};
+
+// For sets.
+template <typename Policy, typename PolicyTraits, typename Alloc,
+ typename = void>
+class node_handle : public node_handle_base<PolicyTraits, Alloc> {
+ using Base = node_handle_base<PolicyTraits, Alloc>;
+
+ public:
+ using value_type = typename PolicyTraits::value_type;
+
+ constexpr node_handle() {}
+
+ value_type& value() const { return PolicyTraits::element(this->slot()); }
+
+ private:
+ friend struct CommonAccess;
+
+ using Base::Base;
+};
+
+// For maps.
+template <typename Policy, typename PolicyTraits, typename Alloc>
+class node_handle<Policy, PolicyTraits, Alloc,
+ absl::void_t<typename Policy::mapped_type>>
+ : public node_handle_base<PolicyTraits, Alloc> {
+ using Base = node_handle_base<PolicyTraits, Alloc>;
+ using slot_type = typename PolicyTraits::slot_type;
+
+ public:
+ using key_type = typename Policy::key_type;
+ using mapped_type = typename Policy::mapped_type;
+
+ constexpr node_handle() {}
+
+ // When C++17 is available, we can use std::launder to provide mutable
+ // access to the key. Otherwise, we provide const access.
+ auto key() const
+ -> decltype(PolicyTraits::mutable_key(std::declval<slot_type*>())) {
+ return PolicyTraits::mutable_key(this->slot());
+ }
+
+ mapped_type& mapped() const {
+ return PolicyTraits::value(&PolicyTraits::element(this->slot()));
+ }
+
+ private:
+ friend struct CommonAccess;
+
+ using Base::Base;
+};
+
+// Provide access to non-public node-handle functions.
+struct CommonAccess {
+ template <typename Node>
+ static auto GetSlot(const Node& node) -> decltype(node.slot()) {
+ return node.slot();
+ }
+
+ template <typename Node>
+ static void Destroy(Node* node) {
+ node->destroy();
+ }
+
+ template <typename Node>
+ static void Reset(Node* node) {
+ node->reset();
+ }
+
+ template <typename T, typename... Args>
+ static T Transfer(Args&&... args) {
+ return T(typename T::transfer_tag_t{}, std::forward<Args>(args)...);
+ }
+
+ template <typename T, typename... Args>
+ static T Move(Args&&... args) {
+ return T(typename T::move_tag_t{}, std::forward<Args>(args)...);
+ }
+};
+
+// Implement the insert_return_type<> concept of C++17.
+template <class Iterator, class NodeType>
+struct InsertReturnType {
+ Iterator position;
+ bool inserted;
+ NodeType node;
+};
+
+} // namespace container_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_CONTAINER_INTERNAL_CONTAINER_H_
diff --git a/third_party/abseil/src/absl/container/internal/compressed_tuple.h b/third_party/abseil/src/absl/container/internal/compressed_tuple.h
new file mode 100644
index 0000000..5ebe164
--- /dev/null
+++ b/third_party/abseil/src/absl/container/internal/compressed_tuple.h
@@ -0,0 +1,290 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// Helper class to perform the Empty Base Optimization.
+// Ts can contain classes and non-classes, empty or not. For the ones that
+// are empty classes, we perform the optimization. If all types in Ts are empty
+// classes, then CompressedTuple<Ts...> is itself an empty class.
+//
+// To access the members, use member get<N>() function.
+//
+// Eg:
+// absl::container_internal::CompressedTuple<int, T1, T2, T3> value(7, t1, t2,
+// t3);
+// assert(value.get<0>() == 7);
+// T1& t1 = value.get<1>();
+// const T2& t2 = value.get<2>();
+// ...
+//
+// https://en.cppreference.com/w/cpp/language/ebo
+
+#ifndef ABSL_CONTAINER_INTERNAL_COMPRESSED_TUPLE_H_
+#define ABSL_CONTAINER_INTERNAL_COMPRESSED_TUPLE_H_
+
+#include <initializer_list>
+#include <tuple>
+#include <type_traits>
+#include <utility>
+
+#include "absl/utility/utility.h"
+
+#if defined(_MSC_VER) && !defined(__NVCC__)
+// We need to mark these classes with this declspec to ensure that
+// CompressedTuple happens.
+#define ABSL_INTERNAL_COMPRESSED_TUPLE_DECLSPEC __declspec(empty_bases)
+#else
+#define ABSL_INTERNAL_COMPRESSED_TUPLE_DECLSPEC
+#endif
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace container_internal {
+
+template <typename... Ts>
+class CompressedTuple;
+
+namespace internal_compressed_tuple {
+
+template <typename D, size_t I>
+struct Elem;
+template <typename... B, size_t I>
+struct Elem<CompressedTuple<B...>, I>
+ : std::tuple_element<I, std::tuple<B...>> {};
+template <typename D, size_t I>
+using ElemT = typename Elem<D, I>::type;
+
+// Use the __is_final intrinsic if available. Where it's not available, classes
+// declared with the 'final' specifier cannot be used as CompressedTuple
+// elements.
+// TODO(sbenza): Replace this with std::is_final in C++14.
+template <typename T>
+constexpr bool IsFinal() {
+#if defined(__clang__) || defined(__GNUC__)
+ return __is_final(T);
+#else
+ return false;
+#endif
+}
+
+// We can't use EBCO on other CompressedTuples because that would mean that we
+// derive from multiple Storage<> instantiations with the same I parameter,
+// and potentially from multiple identical Storage<> instantiations. So anytime
+// we use type inheritance rather than encapsulation, we mark
+// CompressedTupleImpl, to make this easy to detect.
+struct uses_inheritance {};
+
+template <typename T>
+constexpr bool ShouldUseBase() {
+ return std::is_class<T>::value && std::is_empty<T>::value && !IsFinal<T>() &&
+ !std::is_base_of<uses_inheritance, T>::value;
+}
+
+// The storage class provides two specializations:
+// - For empty classes, it stores T as a base class.
+// - For everything else, it stores T as a member.
+template <typename T, size_t I,
+#if defined(_MSC_VER)
+ bool UseBase =
+ ShouldUseBase<typename std::enable_if<true, T>::type>()>
+#else
+ bool UseBase = ShouldUseBase<T>()>
+#endif
+struct Storage {
+ T value;
+ constexpr Storage() = default;
+ template <typename V>
+ explicit constexpr Storage(absl::in_place_t, V&& v)
+ : value(absl::forward<V>(v)) {}
+ constexpr const T& get() const& { return value; }
+ T& get() & { return value; }
+ constexpr const T&& get() const&& { return absl::move(*this).value; }
+ T&& get() && { return std::move(*this).value; }
+};
+
+template <typename T, size_t I>
+struct ABSL_INTERNAL_COMPRESSED_TUPLE_DECLSPEC Storage<T, I, true> : T {
+ constexpr Storage() = default;
+
+ template <typename V>
+ explicit constexpr Storage(absl::in_place_t, V&& v)
+ : T(absl::forward<V>(v)) {}
+
+ constexpr const T& get() const& { return *this; }
+ T& get() & { return *this; }
+ constexpr const T&& get() const&& { return absl::move(*this); }
+ T&& get() && { return std::move(*this); }
+};
+
+template <typename D, typename I, bool ShouldAnyUseBase>
+struct ABSL_INTERNAL_COMPRESSED_TUPLE_DECLSPEC CompressedTupleImpl;
+
+template <typename... Ts, size_t... I, bool ShouldAnyUseBase>
+struct ABSL_INTERNAL_COMPRESSED_TUPLE_DECLSPEC CompressedTupleImpl<
+ CompressedTuple<Ts...>, absl::index_sequence<I...>, ShouldAnyUseBase>
+ // We use the dummy identity function through std::integral_constant to
+ // convince MSVC of accepting and expanding I in that context. Without it
+ // you would get:
+ // error C3548: 'I': parameter pack cannot be used in this context
+ : uses_inheritance,
+ Storage<Ts, std::integral_constant<size_t, I>::value>... {
+ constexpr CompressedTupleImpl() = default;
+ template <typename... Vs>
+ explicit constexpr CompressedTupleImpl(absl::in_place_t, Vs&&... args)
+ : Storage<Ts, I>(absl::in_place, absl::forward<Vs>(args))... {}
+ friend CompressedTuple<Ts...>;
+};
+
+template <typename... Ts, size_t... I>
+struct ABSL_INTERNAL_COMPRESSED_TUPLE_DECLSPEC CompressedTupleImpl<
+ CompressedTuple<Ts...>, absl::index_sequence<I...>, false>
+ // We use the dummy identity function as above...
+ : Storage<Ts, std::integral_constant<size_t, I>::value, false>... {
+ constexpr CompressedTupleImpl() = default;
+ template <typename... Vs>
+ explicit constexpr CompressedTupleImpl(absl::in_place_t, Vs&&... args)
+ : Storage<Ts, I, false>(absl::in_place, absl::forward<Vs>(args))... {}
+ friend CompressedTuple<Ts...>;
+};
+
+std::false_type Or(std::initializer_list<std::false_type>);
+std::true_type Or(std::initializer_list<bool>);
+
+// MSVC requires this to be done separately rather than within the declaration
+// of CompressedTuple below.
+template <typename... Ts>
+constexpr bool ShouldAnyUseBase() {
+ return decltype(
+ Or({std::integral_constant<bool, ShouldUseBase<Ts>()>()...})){};
+}
+
+template <typename T, typename V>
+using TupleElementMoveConstructible =
+ typename std::conditional<std::is_reference<T>::value,
+ std::is_convertible<V, T>,
+ std::is_constructible<T, V&&>>::type;
+
+template <bool SizeMatches, class T, class... Vs>
+struct TupleMoveConstructible : std::false_type {};
+
+template <class... Ts, class... Vs>
+struct TupleMoveConstructible<true, CompressedTuple<Ts...>, Vs...>
+ : std::integral_constant<
+ bool, absl::conjunction<
+ TupleElementMoveConstructible<Ts, Vs&&>...>::value> {};
+
+template <typename T>
+struct compressed_tuple_size;
+
+template <typename... Es>
+struct compressed_tuple_size<CompressedTuple<Es...>>
+ : public std::integral_constant<std::size_t, sizeof...(Es)> {};
+
+template <class T, class... Vs>
+struct TupleItemsMoveConstructible
+ : std::integral_constant<
+ bool, TupleMoveConstructible<compressed_tuple_size<T>::value ==
+ sizeof...(Vs),
+ T, Vs...>::value> {};
+
+} // namespace internal_compressed_tuple
+
+// Helper class to perform the Empty Base Class Optimization.
+// Ts can contain classes and non-classes, empty or not. For the ones that
+// are empty classes, we perform the CompressedTuple. If all types in Ts are
+// empty classes, then CompressedTuple<Ts...> is itself an empty class. (This
+// does not apply when one or more of those empty classes is itself an empty
+// CompressedTuple.)
+//
+// To access the members, use member .get<N>() function.
+//
+// Eg:
+// absl::container_internal::CompressedTuple<int, T1, T2, T3> value(7, t1, t2,
+// t3);
+// assert(value.get<0>() == 7);
+// T1& t1 = value.get<1>();
+// const T2& t2 = value.get<2>();
+// ...
+//
+// https://en.cppreference.com/w/cpp/language/ebo
+template <typename... Ts>
+class ABSL_INTERNAL_COMPRESSED_TUPLE_DECLSPEC CompressedTuple
+ : private internal_compressed_tuple::CompressedTupleImpl<
+ CompressedTuple<Ts...>, absl::index_sequence_for<Ts...>,
+ internal_compressed_tuple::ShouldAnyUseBase<Ts...>()> {
+ private:
+ template <int I>
+ using ElemT = internal_compressed_tuple::ElemT<CompressedTuple, I>;
+
+ template <int I>
+ using StorageT = internal_compressed_tuple::Storage<ElemT<I>, I>;
+
+ public:
+ // There seems to be a bug in MSVC dealing in which using '=default' here will
+ // cause the compiler to ignore the body of other constructors. The work-
+ // around is to explicitly implement the default constructor.
+#if defined(_MSC_VER)
+ constexpr CompressedTuple() : CompressedTuple::CompressedTupleImpl() {}
+#else
+ constexpr CompressedTuple() = default;
+#endif
+ explicit constexpr CompressedTuple(const Ts&... base)
+ : CompressedTuple::CompressedTupleImpl(absl::in_place, base...) {}
+
+ template <typename First, typename... Vs,
+ absl::enable_if_t<
+ absl::conjunction<
+ // Ensure we are not hiding default copy/move constructors.
+ absl::negation<std::is_same<void(CompressedTuple),
+ void(absl::decay_t<First>)>>,
+ internal_compressed_tuple::TupleItemsMoveConstructible<
+ CompressedTuple<Ts...>, First, Vs...>>::value,
+ bool> = true>
+ explicit constexpr CompressedTuple(First&& first, Vs&&... base)
+ : CompressedTuple::CompressedTupleImpl(absl::in_place,
+ absl::forward<First>(first),
+ absl::forward<Vs>(base)...) {}
+
+ template <int I>
+ ElemT<I>& get() & {
+ return StorageT<I>::get();
+ }
+
+ template <int I>
+ constexpr const ElemT<I>& get() const& {
+ return StorageT<I>::get();
+ }
+
+ template <int I>
+ ElemT<I>&& get() && {
+ return std::move(*this).StorageT<I>::get();
+ }
+
+ template <int I>
+ constexpr const ElemT<I>&& get() const&& {
+ return absl::move(*this).StorageT<I>::get();
+ }
+};
+
+// Explicit specialization for a zero-element tuple
+// (needed to avoid ambiguous overloads for the default constructor).
+template <>
+class ABSL_INTERNAL_COMPRESSED_TUPLE_DECLSPEC CompressedTuple<> {};
+
+} // namespace container_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#undef ABSL_INTERNAL_COMPRESSED_TUPLE_DECLSPEC
+
+#endif // ABSL_CONTAINER_INTERNAL_COMPRESSED_TUPLE_H_
diff --git a/third_party/abseil/src/absl/container/internal/compressed_tuple_test.cc b/third_party/abseil/src/absl/container/internal/compressed_tuple_test.cc
new file mode 100644
index 0000000..62a7483
--- /dev/null
+++ b/third_party/abseil/src/absl/container/internal/compressed_tuple_test.cc
@@ -0,0 +1,409 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/container/internal/compressed_tuple.h"
+
+#include <memory>
+#include <string>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/container/internal/test_instance_tracker.h"
+#include "absl/memory/memory.h"
+#include "absl/types/any.h"
+#include "absl/types/optional.h"
+#include "absl/utility/utility.h"
+
+// These are declared at global scope purely so that error messages
+// are smaller and easier to understand.
+enum class CallType { kConstRef, kConstMove };
+
+template <int>
+struct Empty {
+ constexpr CallType value() const& { return CallType::kConstRef; }
+ constexpr CallType value() const&& { return CallType::kConstMove; }
+};
+
+template <typename T>
+struct NotEmpty {
+ T value;
+};
+
+template <typename T, typename U>
+struct TwoValues {
+ T value1;
+ U value2;
+};
+
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace container_internal {
+namespace {
+
+using absl::test_internal::CopyableMovableInstance;
+using absl::test_internal::InstanceTracker;
+
+TEST(CompressedTupleTest, Sizeof) {
+ EXPECT_EQ(sizeof(int), sizeof(CompressedTuple<int>));
+ EXPECT_EQ(sizeof(int), sizeof(CompressedTuple<int, Empty<0>>));
+ EXPECT_EQ(sizeof(int), sizeof(CompressedTuple<int, Empty<0>, Empty<1>>));
+ EXPECT_EQ(sizeof(int),
+ sizeof(CompressedTuple<int, Empty<0>, Empty<1>, Empty<2>>));
+
+ EXPECT_EQ(sizeof(TwoValues<int, double>),
+ sizeof(CompressedTuple<int, NotEmpty<double>>));
+ EXPECT_EQ(sizeof(TwoValues<int, double>),
+ sizeof(CompressedTuple<int, Empty<0>, NotEmpty<double>>));
+ EXPECT_EQ(sizeof(TwoValues<int, double>),
+ sizeof(CompressedTuple<int, Empty<0>, NotEmpty<double>, Empty<1>>));
+}
+
+TEST(CompressedTupleTest, OneMoveOnRValueConstructionTemp) {
+ InstanceTracker tracker;
+ CompressedTuple<CopyableMovableInstance> x1(CopyableMovableInstance(1));
+ EXPECT_EQ(tracker.instances(), 1);
+ EXPECT_EQ(tracker.copies(), 0);
+ EXPECT_LE(tracker.moves(), 1);
+ EXPECT_EQ(x1.get<0>().value(), 1);
+}
+
+TEST(CompressedTupleTest, OneMoveOnRValueConstructionMove) {
+ InstanceTracker tracker;
+
+ CopyableMovableInstance i1(1);
+ CompressedTuple<CopyableMovableInstance> x1(std::move(i1));
+ EXPECT_EQ(tracker.instances(), 2);
+ EXPECT_EQ(tracker.copies(), 0);
+ EXPECT_LE(tracker.moves(), 1);
+ EXPECT_EQ(x1.get<0>().value(), 1);
+}
+
+TEST(CompressedTupleTest, OneMoveOnRValueConstructionMixedTypes) {
+ InstanceTracker tracker;
+ CopyableMovableInstance i1(1);
+ CopyableMovableInstance i2(2);
+ Empty<0> empty;
+ CompressedTuple<CopyableMovableInstance, CopyableMovableInstance&, Empty<0>>
+ x1(std::move(i1), i2, empty);
+ EXPECT_EQ(x1.get<0>().value(), 1);
+ EXPECT_EQ(x1.get<1>().value(), 2);
+ EXPECT_EQ(tracker.copies(), 0);
+ EXPECT_EQ(tracker.moves(), 1);
+}
+
+struct IncompleteType;
+CompressedTuple<CopyableMovableInstance, IncompleteType&, Empty<0>>
+MakeWithIncomplete(CopyableMovableInstance i1,
+ IncompleteType& t, // NOLINT
+ Empty<0> empty) {
+ return CompressedTuple<CopyableMovableInstance, IncompleteType&, Empty<0>>{
+ std::move(i1), t, empty};
+}
+
+struct IncompleteType {};
+TEST(CompressedTupleTest, OneMoveOnRValueConstructionWithIncompleteType) {
+ InstanceTracker tracker;
+ CopyableMovableInstance i1(1);
+ Empty<0> empty;
+ struct DerivedType : IncompleteType {int value = 0;};
+ DerivedType fd;
+ fd.value = 7;
+
+ CompressedTuple<CopyableMovableInstance, IncompleteType&, Empty<0>> x1 =
+ MakeWithIncomplete(std::move(i1), fd, empty);
+
+ EXPECT_EQ(x1.get<0>().value(), 1);
+ EXPECT_EQ(static_cast<DerivedType&>(x1.get<1>()).value, 7);
+
+ EXPECT_EQ(tracker.copies(), 0);
+ EXPECT_EQ(tracker.moves(), 2);
+}
+
+TEST(CompressedTupleTest,
+ OneMoveOnRValueConstructionMixedTypes_BraceInitPoisonPillExpected) {
+ InstanceTracker tracker;
+ CopyableMovableInstance i1(1);
+ CopyableMovableInstance i2(2);
+ CompressedTuple<CopyableMovableInstance, CopyableMovableInstance&, Empty<0>>
+ x1(std::move(i1), i2, {}); // NOLINT
+ EXPECT_EQ(x1.get<0>().value(), 1);
+ EXPECT_EQ(x1.get<1>().value(), 2);
+ EXPECT_EQ(tracker.instances(), 3);
+ // We are forced into the `const Ts&...` constructor (invoking copies)
+ // because we need it to deduce the type of `{}`.
+ // std::tuple also has this behavior.
+ // Note, this test is proof that this is expected behavior, but it is not
+ // _desired_ behavior.
+ EXPECT_EQ(tracker.copies(), 1);
+ EXPECT_EQ(tracker.moves(), 0);
+}
+
+TEST(CompressedTupleTest, OneCopyOnLValueConstruction) {
+ InstanceTracker tracker;
+ CopyableMovableInstance i1(1);
+
+ CompressedTuple<CopyableMovableInstance> x1(i1);
+ EXPECT_EQ(tracker.copies(), 1);
+ EXPECT_EQ(tracker.moves(), 0);
+
+ tracker.ResetCopiesMovesSwaps();
+
+ CopyableMovableInstance i2(2);
+ const CopyableMovableInstance& i2_ref = i2;
+ CompressedTuple<CopyableMovableInstance> x2(i2_ref);
+ EXPECT_EQ(tracker.copies(), 1);
+ EXPECT_EQ(tracker.moves(), 0);
+}
+
+TEST(CompressedTupleTest, OneMoveOnRValueAccess) {
+ InstanceTracker tracker;
+ CopyableMovableInstance i1(1);
+ CompressedTuple<CopyableMovableInstance> x(std::move(i1));
+ tracker.ResetCopiesMovesSwaps();
+
+ CopyableMovableInstance i2 = std::move(x).get<0>();
+ EXPECT_EQ(tracker.copies(), 0);
+ EXPECT_EQ(tracker.moves(), 1);
+}
+
+TEST(CompressedTupleTest, OneCopyOnLValueAccess) {
+ InstanceTracker tracker;
+
+ CompressedTuple<CopyableMovableInstance> x(CopyableMovableInstance(0));
+ EXPECT_EQ(tracker.copies(), 0);
+ EXPECT_EQ(tracker.moves(), 1);
+
+ CopyableMovableInstance t = x.get<0>();
+ EXPECT_EQ(tracker.copies(), 1);
+ EXPECT_EQ(tracker.moves(), 1);
+}
+
+TEST(CompressedTupleTest, ZeroCopyOnRefAccess) {
+ InstanceTracker tracker;
+
+ CompressedTuple<CopyableMovableInstance> x(CopyableMovableInstance(0));
+ EXPECT_EQ(tracker.copies(), 0);
+ EXPECT_EQ(tracker.moves(), 1);
+
+ CopyableMovableInstance& t1 = x.get<0>();
+ const CopyableMovableInstance& t2 = x.get<0>();
+ EXPECT_EQ(tracker.copies(), 0);
+ EXPECT_EQ(tracker.moves(), 1);
+ EXPECT_EQ(t1.value(), 0);
+ EXPECT_EQ(t2.value(), 0);
+}
+
+TEST(CompressedTupleTest, Access) {
+ struct S {
+ std::string x;
+ };
+ CompressedTuple<int, Empty<0>, S> x(7, {}, S{"ABC"});
+ EXPECT_EQ(sizeof(x), sizeof(TwoValues<int, S>));
+ EXPECT_EQ(7, x.get<0>());
+ EXPECT_EQ("ABC", x.get<2>().x);
+}
+
+TEST(CompressedTupleTest, NonClasses) {
+ CompressedTuple<int, const char*> x(7, "ABC");
+ EXPECT_EQ(7, x.get<0>());
+ EXPECT_STREQ("ABC", x.get<1>());
+}
+
+TEST(CompressedTupleTest, MixClassAndNonClass) {
+ CompressedTuple<int, const char*, Empty<0>, NotEmpty<double>> x(7, "ABC", {},
+ {1.25});
+ struct Mock {
+ int v;
+ const char* p;
+ double d;
+ };
+ EXPECT_EQ(sizeof(x), sizeof(Mock));
+ EXPECT_EQ(7, x.get<0>());
+ EXPECT_STREQ("ABC", x.get<1>());
+ EXPECT_EQ(1.25, x.get<3>().value);
+}
+
+TEST(CompressedTupleTest, Nested) {
+ CompressedTuple<int, CompressedTuple<int>,
+ CompressedTuple<int, CompressedTuple<int>>>
+ x(1, CompressedTuple<int>(2),
+ CompressedTuple<int, CompressedTuple<int>>(3, CompressedTuple<int>(4)));
+ EXPECT_EQ(1, x.get<0>());
+ EXPECT_EQ(2, x.get<1>().get<0>());
+ EXPECT_EQ(3, x.get<2>().get<0>());
+ EXPECT_EQ(4, x.get<2>().get<1>().get<0>());
+
+ CompressedTuple<Empty<0>, Empty<0>,
+ CompressedTuple<Empty<0>, CompressedTuple<Empty<0>>>>
+ y;
+ std::set<Empty<0>*> empties{&y.get<0>(), &y.get<1>(), &y.get<2>().get<0>(),
+ &y.get<2>().get<1>().get<0>()};
+#ifdef _MSC_VER
+ // MSVC has a bug where many instances of the same base class are layed out in
+ // the same address when using __declspec(empty_bases).
+ // This will be fixed in a future version of MSVC.
+ int expected = 1;
+#else
+ int expected = 4;
+#endif
+ EXPECT_EQ(expected, sizeof(y));
+ EXPECT_EQ(expected, empties.size());
+ EXPECT_EQ(sizeof(y), sizeof(Empty<0>) * empties.size());
+
+ EXPECT_EQ(4 * sizeof(char),
+ sizeof(CompressedTuple<CompressedTuple<char, char>,
+ CompressedTuple<char, char>>));
+ EXPECT_TRUE((std::is_empty<CompressedTuple<Empty<0>, Empty<1>>>::value));
+
+ // Make sure everything still works when things are nested.
+ struct CT_Empty : CompressedTuple<Empty<0>> {};
+ CompressedTuple<Empty<0>, CT_Empty> nested_empty;
+ auto contained = nested_empty.get<0>();
+ auto nested = nested_empty.get<1>().get<0>();
+ EXPECT_TRUE((std::is_same<decltype(contained), decltype(nested)>::value));
+}
+
+TEST(CompressedTupleTest, Reference) {
+ int i = 7;
+ std::string s = "Very long string that goes in the heap";
+ CompressedTuple<int, int&, std::string, std::string&> x(i, i, s, s);
+
+ // Sanity check. We should have not moved from `s`
+ EXPECT_EQ(s, "Very long string that goes in the heap");
+
+ EXPECT_EQ(x.get<0>(), x.get<1>());
+ EXPECT_NE(&x.get<0>(), &x.get<1>());
+ EXPECT_EQ(&x.get<1>(), &i);
+
+ EXPECT_EQ(x.get<2>(), x.get<3>());
+ EXPECT_NE(&x.get<2>(), &x.get<3>());
+ EXPECT_EQ(&x.get<3>(), &s);
+}
+
+TEST(CompressedTupleTest, NoElements) {
+ CompressedTuple<> x;
+ static_cast<void>(x); // Silence -Wunused-variable.
+ EXPECT_TRUE(std::is_empty<CompressedTuple<>>::value);
+}
+
+TEST(CompressedTupleTest, MoveOnlyElements) {
+ CompressedTuple<std::unique_ptr<std::string>> str_tup(
+ absl::make_unique<std::string>("str"));
+
+ CompressedTuple<CompressedTuple<std::unique_ptr<std::string>>,
+ std::unique_ptr<int>>
+ x(std::move(str_tup), absl::make_unique<int>(5));
+
+ EXPECT_EQ(*x.get<0>().get<0>(), "str");
+ EXPECT_EQ(*x.get<1>(), 5);
+
+ std::unique_ptr<std::string> x0 = std::move(x.get<0>()).get<0>();
+ std::unique_ptr<int> x1 = std::move(x).get<1>();
+
+ EXPECT_EQ(*x0, "str");
+ EXPECT_EQ(*x1, 5);
+}
+
+TEST(CompressedTupleTest, MoveConstructionMoveOnlyElements) {
+ CompressedTuple<std::unique_ptr<std::string>> base(
+ absl::make_unique<std::string>("str"));
+ EXPECT_EQ(*base.get<0>(), "str");
+
+ CompressedTuple<std::unique_ptr<std::string>> copy(std::move(base));
+ EXPECT_EQ(*copy.get<0>(), "str");
+}
+
+TEST(CompressedTupleTest, AnyElements) {
+ any a(std::string("str"));
+ CompressedTuple<any, any&> x(any(5), a);
+ EXPECT_EQ(absl::any_cast<int>(x.get<0>()), 5);
+ EXPECT_EQ(absl::any_cast<std::string>(x.get<1>()), "str");
+
+ a = 0.5f;
+ EXPECT_EQ(absl::any_cast<float>(x.get<1>()), 0.5);
+}
+
+TEST(CompressedTupleTest, Constexpr) {
+ struct NonTrivialStruct {
+ constexpr NonTrivialStruct() = default;
+ constexpr int value() const { return v; }
+ int v = 5;
+ };
+ struct TrivialStruct {
+ TrivialStruct() = default;
+ constexpr int value() const { return v; }
+ int v;
+ };
+ constexpr CompressedTuple<int, double, CompressedTuple<int>, Empty<0>> x(
+ 7, 1.25, CompressedTuple<int>(5), {});
+ constexpr int x0 = x.get<0>();
+ constexpr double x1 = x.get<1>();
+ constexpr int x2 = x.get<2>().get<0>();
+ constexpr CallType x3 = x.get<3>().value();
+
+ EXPECT_EQ(x0, 7);
+ EXPECT_EQ(x1, 1.25);
+ EXPECT_EQ(x2, 5);
+ EXPECT_EQ(x3, CallType::kConstRef);
+
+#if !defined(__GNUC__) || defined(__clang__) || __GNUC__ > 4
+ constexpr CompressedTuple<Empty<0>, TrivialStruct, int> trivial = {};
+ constexpr CallType trivial0 = trivial.get<0>().value();
+ constexpr int trivial1 = trivial.get<1>().value();
+ constexpr int trivial2 = trivial.get<2>();
+
+ EXPECT_EQ(trivial0, CallType::kConstRef);
+ EXPECT_EQ(trivial1, 0);
+ EXPECT_EQ(trivial2, 0);
+#endif
+
+ constexpr CompressedTuple<Empty<0>, NonTrivialStruct, absl::optional<int>>
+ non_trivial = {};
+ constexpr CallType non_trivial0 = non_trivial.get<0>().value();
+ constexpr int non_trivial1 = non_trivial.get<1>().value();
+ constexpr absl::optional<int> non_trivial2 = non_trivial.get<2>();
+
+ EXPECT_EQ(non_trivial0, CallType::kConstRef);
+ EXPECT_EQ(non_trivial1, 5);
+ EXPECT_EQ(non_trivial2, absl::nullopt);
+
+ static constexpr char data[] = "DEF";
+ constexpr CompressedTuple<const char*> z(data);
+ constexpr const char* z1 = z.get<0>();
+ EXPECT_EQ(std::string(z1), std::string(data));
+
+#if defined(__clang__)
+ // An apparent bug in earlier versions of gcc claims these are ambiguous.
+ constexpr int x2m = absl::move(x.get<2>()).get<0>();
+ constexpr CallType x3m = absl::move(x).get<3>().value();
+ EXPECT_EQ(x2m, 5);
+ EXPECT_EQ(x3m, CallType::kConstMove);
+#endif
+}
+
+#if defined(__clang__) || defined(__GNUC__)
+TEST(CompressedTupleTest, EmptyFinalClass) {
+ struct S final {
+ int f() const { return 5; }
+ };
+ CompressedTuple<S> x;
+ EXPECT_EQ(x.get<0>().f(), 5);
+}
+#endif
+
+} // namespace
+} // namespace container_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/container/internal/container_memory.h b/third_party/abseil/src/absl/container/internal/container_memory.h
new file mode 100644
index 0000000..e67529e
--- /dev/null
+++ b/third_party/abseil/src/absl/container/internal/container_memory.h
@@ -0,0 +1,460 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_CONTAINER_INTERNAL_CONTAINER_MEMORY_H_
+#define ABSL_CONTAINER_INTERNAL_CONTAINER_MEMORY_H_
+
+#include <cassert>
+#include <cstddef>
+#include <memory>
+#include <new>
+#include <tuple>
+#include <type_traits>
+#include <utility>
+
+#include "absl/base/config.h"
+#include "absl/memory/memory.h"
+#include "absl/meta/type_traits.h"
+#include "absl/utility/utility.h"
+
+#ifdef ABSL_HAVE_ADDRESS_SANITIZER
+#include <sanitizer/asan_interface.h>
+#endif
+
+#ifdef ABSL_HAVE_MEMORY_SANITIZER
+#include <sanitizer/msan_interface.h>
+#endif
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace container_internal {
+
+template <size_t Alignment>
+struct alignas(Alignment) AlignedType {};
+
+// Allocates at least n bytes aligned to the specified alignment.
+// Alignment must be a power of 2. It must be positive.
+//
+// Note that many allocators don't honor alignment requirements above certain
+// threshold (usually either alignof(std::max_align_t) or alignof(void*)).
+// Allocate() doesn't apply alignment corrections. If the underlying allocator
+// returns insufficiently alignment pointer, that's what you are going to get.
+template <size_t Alignment, class Alloc>
+void* Allocate(Alloc* alloc, size_t n) {
+ static_assert(Alignment > 0, "");
+ assert(n && "n must be positive");
+ using M = AlignedType<Alignment>;
+ using A = typename absl::allocator_traits<Alloc>::template rebind_alloc<M>;
+ using AT = typename absl::allocator_traits<Alloc>::template rebind_traits<M>;
+ // On macOS, "mem_alloc" is a #define with one argument defined in
+ // rpc/types.h, so we can't name the variable "mem_alloc" and initialize it
+ // with the "foo(bar)" syntax.
+ A my_mem_alloc(*alloc);
+ void* p = AT::allocate(my_mem_alloc, (n + sizeof(M) - 1) / sizeof(M));
+ assert(reinterpret_cast<uintptr_t>(p) % Alignment == 0 &&
+ "allocator does not respect alignment");
+ return p;
+}
+
+// The pointer must have been previously obtained by calling
+// Allocate<Alignment>(alloc, n).
+template <size_t Alignment, class Alloc>
+void Deallocate(Alloc* alloc, void* p, size_t n) {
+ static_assert(Alignment > 0, "");
+ assert(n && "n must be positive");
+ using M = AlignedType<Alignment>;
+ using A = typename absl::allocator_traits<Alloc>::template rebind_alloc<M>;
+ using AT = typename absl::allocator_traits<Alloc>::template rebind_traits<M>;
+ // On macOS, "mem_alloc" is a #define with one argument defined in
+ // rpc/types.h, so we can't name the variable "mem_alloc" and initialize it
+ // with the "foo(bar)" syntax.
+ A my_mem_alloc(*alloc);
+ AT::deallocate(my_mem_alloc, static_cast<M*>(p),
+ (n + sizeof(M) - 1) / sizeof(M));
+}
+
+namespace memory_internal {
+
+// Constructs T into uninitialized storage pointed by `ptr` using the args
+// specified in the tuple.
+template <class Alloc, class T, class Tuple, size_t... I>
+void ConstructFromTupleImpl(Alloc* alloc, T* ptr, Tuple&& t,
+ absl::index_sequence<I...>) {
+ absl::allocator_traits<Alloc>::construct(
+ *alloc, ptr, std::get<I>(std::forward<Tuple>(t))...);
+}
+
+template <class T, class F>
+struct WithConstructedImplF {
+ template <class... Args>
+ decltype(std::declval<F>()(std::declval<T>())) operator()(
+ Args&&... args) const {
+ return std::forward<F>(f)(T(std::forward<Args>(args)...));
+ }
+ F&& f;
+};
+
+template <class T, class Tuple, size_t... Is, class F>
+decltype(std::declval<F>()(std::declval<T>())) WithConstructedImpl(
+ Tuple&& t, absl::index_sequence<Is...>, F&& f) {
+ return WithConstructedImplF<T, F>{std::forward<F>(f)}(
+ std::get<Is>(std::forward<Tuple>(t))...);
+}
+
+template <class T, size_t... Is>
+auto TupleRefImpl(T&& t, absl::index_sequence<Is...>)
+ -> decltype(std::forward_as_tuple(std::get<Is>(std::forward<T>(t))...)) {
+ return std::forward_as_tuple(std::get<Is>(std::forward<T>(t))...);
+}
+
+// Returns a tuple of references to the elements of the input tuple. T must be a
+// tuple.
+template <class T>
+auto TupleRef(T&& t) -> decltype(
+ TupleRefImpl(std::forward<T>(t),
+ absl::make_index_sequence<
+ std::tuple_size<typename std::decay<T>::type>::value>())) {
+ return TupleRefImpl(
+ std::forward<T>(t),
+ absl::make_index_sequence<
+ std::tuple_size<typename std::decay<T>::type>::value>());
+}
+
+template <class F, class K, class V>
+decltype(std::declval<F>()(std::declval<const K&>(), std::piecewise_construct,
+ std::declval<std::tuple<K>>(), std::declval<V>()))
+DecomposePairImpl(F&& f, std::pair<std::tuple<K>, V> p) {
+ const auto& key = std::get<0>(p.first);
+ return std::forward<F>(f)(key, std::piecewise_construct, std::move(p.first),
+ std::move(p.second));
+}
+
+} // namespace memory_internal
+
+// Constructs T into uninitialized storage pointed by `ptr` using the args
+// specified in the tuple.
+template <class Alloc, class T, class Tuple>
+void ConstructFromTuple(Alloc* alloc, T* ptr, Tuple&& t) {
+ memory_internal::ConstructFromTupleImpl(
+ alloc, ptr, std::forward<Tuple>(t),
+ absl::make_index_sequence<
+ std::tuple_size<typename std::decay<Tuple>::type>::value>());
+}
+
+// Constructs T using the args specified in the tuple and calls F with the
+// constructed value.
+template <class T, class Tuple, class F>
+decltype(std::declval<F>()(std::declval<T>())) WithConstructed(
+ Tuple&& t, F&& f) {
+ return memory_internal::WithConstructedImpl<T>(
+ std::forward<Tuple>(t),
+ absl::make_index_sequence<
+ std::tuple_size<typename std::decay<Tuple>::type>::value>(),
+ std::forward<F>(f));
+}
+
+// Given arguments of an std::pair's consructor, PairArgs() returns a pair of
+// tuples with references to the passed arguments. The tuples contain
+// constructor arguments for the first and the second elements of the pair.
+//
+// The following two snippets are equivalent.
+//
+// 1. std::pair<F, S> p(args...);
+//
+// 2. auto a = PairArgs(args...);
+// std::pair<F, S> p(std::piecewise_construct,
+// std::move(p.first), std::move(p.second));
+inline std::pair<std::tuple<>, std::tuple<>> PairArgs() { return {}; }
+template <class F, class S>
+std::pair<std::tuple<F&&>, std::tuple<S&&>> PairArgs(F&& f, S&& s) {
+ return {std::piecewise_construct, std::forward_as_tuple(std::forward<F>(f)),
+ std::forward_as_tuple(std::forward<S>(s))};
+}
+template <class F, class S>
+std::pair<std::tuple<const F&>, std::tuple<const S&>> PairArgs(
+ const std::pair<F, S>& p) {
+ return PairArgs(p.first, p.second);
+}
+template <class F, class S>
+std::pair<std::tuple<F&&>, std::tuple<S&&>> PairArgs(std::pair<F, S>&& p) {
+ return PairArgs(std::forward<F>(p.first), std::forward<S>(p.second));
+}
+template <class F, class S>
+auto PairArgs(std::piecewise_construct_t, F&& f, S&& s)
+ -> decltype(std::make_pair(memory_internal::TupleRef(std::forward<F>(f)),
+ memory_internal::TupleRef(std::forward<S>(s)))) {
+ return std::make_pair(memory_internal::TupleRef(std::forward<F>(f)),
+ memory_internal::TupleRef(std::forward<S>(s)));
+}
+
+// A helper function for implementing apply() in map policies.
+template <class F, class... Args>
+auto DecomposePair(F&& f, Args&&... args)
+ -> decltype(memory_internal::DecomposePairImpl(
+ std::forward<F>(f), PairArgs(std::forward<Args>(args)...))) {
+ return memory_internal::DecomposePairImpl(
+ std::forward<F>(f), PairArgs(std::forward<Args>(args)...));
+}
+
+// A helper function for implementing apply() in set policies.
+template <class F, class Arg>
+decltype(std::declval<F>()(std::declval<const Arg&>(), std::declval<Arg>()))
+DecomposeValue(F&& f, Arg&& arg) {
+ const auto& key = arg;
+ return std::forward<F>(f)(key, std::forward<Arg>(arg));
+}
+
+// Helper functions for asan and msan.
+inline void SanitizerPoisonMemoryRegion(const void* m, size_t s) {
+#ifdef ABSL_HAVE_ADDRESS_SANITIZER
+ ASAN_POISON_MEMORY_REGION(m, s);
+#endif
+#ifdef ABSL_HAVE_MEMORY_SANITIZER
+ __msan_poison(m, s);
+#endif
+ (void)m;
+ (void)s;
+}
+
+inline void SanitizerUnpoisonMemoryRegion(const void* m, size_t s) {
+#ifdef ABSL_HAVE_ADDRESS_SANITIZER
+ ASAN_UNPOISON_MEMORY_REGION(m, s);
+#endif
+#ifdef ABSL_HAVE_MEMORY_SANITIZER
+ __msan_unpoison(m, s);
+#endif
+ (void)m;
+ (void)s;
+}
+
+template <typename T>
+inline void SanitizerPoisonObject(const T* object) {
+ SanitizerPoisonMemoryRegion(object, sizeof(T));
+}
+
+template <typename T>
+inline void SanitizerUnpoisonObject(const T* object) {
+ SanitizerUnpoisonMemoryRegion(object, sizeof(T));
+}
+
+namespace memory_internal {
+
+// If Pair is a standard-layout type, OffsetOf<Pair>::kFirst and
+// OffsetOf<Pair>::kSecond are equivalent to offsetof(Pair, first) and
+// offsetof(Pair, second) respectively. Otherwise they are -1.
+//
+// The purpose of OffsetOf is to avoid calling offsetof() on non-standard-layout
+// type, which is non-portable.
+template <class Pair, class = std::true_type>
+struct OffsetOf {
+ static constexpr size_t kFirst = static_cast<size_t>(-1);
+ static constexpr size_t kSecond = static_cast<size_t>(-1);
+};
+
+template <class Pair>
+struct OffsetOf<Pair, typename std::is_standard_layout<Pair>::type> {
+ static constexpr size_t kFirst = offsetof(Pair, first);
+ static constexpr size_t kSecond = offsetof(Pair, second);
+};
+
+template <class K, class V>
+struct IsLayoutCompatible {
+ private:
+ struct Pair {
+ K first;
+ V second;
+ };
+
+ // Is P layout-compatible with Pair?
+ template <class P>
+ static constexpr bool LayoutCompatible() {
+ return std::is_standard_layout<P>() && sizeof(P) == sizeof(Pair) &&
+ alignof(P) == alignof(Pair) &&
+ memory_internal::OffsetOf<P>::kFirst ==
+ memory_internal::OffsetOf<Pair>::kFirst &&
+ memory_internal::OffsetOf<P>::kSecond ==
+ memory_internal::OffsetOf<Pair>::kSecond;
+ }
+
+ public:
+ // Whether pair<const K, V> and pair<K, V> are layout-compatible. If they are,
+ // then it is safe to store them in a union and read from either.
+ static constexpr bool value = std::is_standard_layout<K>() &&
+ std::is_standard_layout<Pair>() &&
+ memory_internal::OffsetOf<Pair>::kFirst == 0 &&
+ LayoutCompatible<std::pair<K, V>>() &&
+ LayoutCompatible<std::pair<const K, V>>();
+};
+
+} // namespace memory_internal
+
+// The internal storage type for key-value containers like flat_hash_map.
+//
+// It is convenient for the value_type of a flat_hash_map<K, V> to be
+// pair<const K, V>; the "const K" prevents accidental modification of the key
+// when dealing with the reference returned from find() and similar methods.
+// However, this creates other problems; we want to be able to emplace(K, V)
+// efficiently with move operations, and similarly be able to move a
+// pair<K, V> in insert().
+//
+// The solution is this union, which aliases the const and non-const versions
+// of the pair. This also allows flat_hash_map<const K, V> to work, even though
+// that has the same efficiency issues with move in emplace() and insert() -
+// but people do it anyway.
+//
+// If kMutableKeys is false, only the value member can be accessed.
+//
+// If kMutableKeys is true, key can be accessed through all slots while value
+// and mutable_value must be accessed only via INITIALIZED slots. Slots are
+// created and destroyed via mutable_value so that the key can be moved later.
+//
+// Accessing one of the union fields while the other is active is safe as
+// long as they are layout-compatible, which is guaranteed by the definition of
+// kMutableKeys. For C++11, the relevant section of the standard is
+// https://timsong-cpp.github.io/cppwp/n3337/class.mem#19 (9.2.19)
+template <class K, class V>
+union map_slot_type {
+ map_slot_type() {}
+ ~map_slot_type() = delete;
+ using value_type = std::pair<const K, V>;
+ using mutable_value_type =
+ std::pair<absl::remove_const_t<K>, absl::remove_const_t<V>>;
+
+ value_type value;
+ mutable_value_type mutable_value;
+ absl::remove_const_t<K> key;
+};
+
+template <class K, class V>
+struct map_slot_policy {
+ using slot_type = map_slot_type<K, V>;
+ using value_type = std::pair<const K, V>;
+ using mutable_value_type = std::pair<K, V>;
+
+ private:
+ static void emplace(slot_type* slot) {
+ // The construction of union doesn't do anything at runtime but it allows us
+ // to access its members without violating aliasing rules.
+ new (slot) slot_type;
+ }
+ // If pair<const K, V> and pair<K, V> are layout-compatible, we can accept one
+ // or the other via slot_type. We are also free to access the key via
+ // slot_type::key in this case.
+ using kMutableKeys = memory_internal::IsLayoutCompatible<K, V>;
+
+ public:
+ static value_type& element(slot_type* slot) { return slot->value; }
+ static const value_type& element(const slot_type* slot) {
+ return slot->value;
+ }
+
+ // When C++17 is available, we can use std::launder to provide mutable
+ // access to the key for use in node handle.
+#if defined(__cpp_lib_launder) && __cpp_lib_launder >= 201606
+ static K& mutable_key(slot_type* slot) {
+ // Still check for kMutableKeys so that we can avoid calling std::launder
+ // unless necessary because it can interfere with optimizations.
+ return kMutableKeys::value ? slot->key
+ : *std::launder(const_cast<K*>(
+ std::addressof(slot->value.first)));
+ }
+#else // !(defined(__cpp_lib_launder) && __cpp_lib_launder >= 201606)
+ static const K& mutable_key(slot_type* slot) { return key(slot); }
+#endif
+
+ static const K& key(const slot_type* slot) {
+ return kMutableKeys::value ? slot->key : slot->value.first;
+ }
+
+ template <class Allocator, class... Args>
+ static void construct(Allocator* alloc, slot_type* slot, Args&&... args) {
+ emplace(slot);
+ if (kMutableKeys::value) {
+ absl::allocator_traits<Allocator>::construct(*alloc, &slot->mutable_value,
+ std::forward<Args>(args)...);
+ } else {
+ absl::allocator_traits<Allocator>::construct(*alloc, &slot->value,
+ std::forward<Args>(args)...);
+ }
+ }
+
+ // Construct this slot by moving from another slot.
+ template <class Allocator>
+ static void construct(Allocator* alloc, slot_type* slot, slot_type* other) {
+ emplace(slot);
+ if (kMutableKeys::value) {
+ absl::allocator_traits<Allocator>::construct(
+ *alloc, &slot->mutable_value, std::move(other->mutable_value));
+ } else {
+ absl::allocator_traits<Allocator>::construct(*alloc, &slot->value,
+ std::move(other->value));
+ }
+ }
+
+ template <class Allocator>
+ static void destroy(Allocator* alloc, slot_type* slot) {
+ if (kMutableKeys::value) {
+ absl::allocator_traits<Allocator>::destroy(*alloc, &slot->mutable_value);
+ } else {
+ absl::allocator_traits<Allocator>::destroy(*alloc, &slot->value);
+ }
+ }
+
+ template <class Allocator>
+ static void transfer(Allocator* alloc, slot_type* new_slot,
+ slot_type* old_slot) {
+ emplace(new_slot);
+ if (kMutableKeys::value) {
+ absl::allocator_traits<Allocator>::construct(
+ *alloc, &new_slot->mutable_value, std::move(old_slot->mutable_value));
+ } else {
+ absl::allocator_traits<Allocator>::construct(*alloc, &new_slot->value,
+ std::move(old_slot->value));
+ }
+ destroy(alloc, old_slot);
+ }
+
+ template <class Allocator>
+ static void swap(Allocator* alloc, slot_type* a, slot_type* b) {
+ if (kMutableKeys::value) {
+ using std::swap;
+ swap(a->mutable_value, b->mutable_value);
+ } else {
+ value_type tmp = std::move(a->value);
+ absl::allocator_traits<Allocator>::destroy(*alloc, &a->value);
+ absl::allocator_traits<Allocator>::construct(*alloc, &a->value,
+ std::move(b->value));
+ absl::allocator_traits<Allocator>::destroy(*alloc, &b->value);
+ absl::allocator_traits<Allocator>::construct(*alloc, &b->value,
+ std::move(tmp));
+ }
+ }
+
+ template <class Allocator>
+ static void move(Allocator* alloc, slot_type* src, slot_type* dest) {
+ if (kMutableKeys::value) {
+ dest->mutable_value = std::move(src->mutable_value);
+ } else {
+ absl::allocator_traits<Allocator>::destroy(*alloc, &dest->value);
+ absl::allocator_traits<Allocator>::construct(*alloc, &dest->value,
+ std::move(src->value));
+ }
+ }
+};
+
+} // namespace container_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_CONTAINER_INTERNAL_CONTAINER_MEMORY_H_
diff --git a/third_party/abseil/src/absl/container/internal/container_memory_test.cc b/third_party/abseil/src/absl/container/internal/container_memory_test.cc
new file mode 100644
index 0000000..6a7fcd2
--- /dev/null
+++ b/third_party/abseil/src/absl/container/internal/container_memory_test.cc
@@ -0,0 +1,256 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/container/internal/container_memory.h"
+
+#include <cstdint>
+#include <tuple>
+#include <typeindex>
+#include <typeinfo>
+#include <utility>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/container/internal/test_instance_tracker.h"
+#include "absl/strings/string_view.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace container_internal {
+namespace {
+
+using ::absl::test_internal::CopyableMovableInstance;
+using ::absl::test_internal::InstanceTracker;
+using ::testing::_;
+using ::testing::ElementsAre;
+using ::testing::Gt;
+using ::testing::Pair;
+
+TEST(Memory, AlignmentLargerThanBase) {
+ std::allocator<int8_t> alloc;
+ void* mem = Allocate<2>(&alloc, 3);
+ EXPECT_EQ(0, reinterpret_cast<uintptr_t>(mem) % 2);
+ memcpy(mem, "abc", 3);
+ Deallocate<2>(&alloc, mem, 3);
+}
+
+TEST(Memory, AlignmentSmallerThanBase) {
+ std::allocator<int64_t> alloc;
+ void* mem = Allocate<2>(&alloc, 3);
+ EXPECT_EQ(0, reinterpret_cast<uintptr_t>(mem) % 2);
+ memcpy(mem, "abc", 3);
+ Deallocate<2>(&alloc, mem, 3);
+}
+
+std::map<std::type_index, int>& AllocationMap() {
+ static auto* map = new std::map<std::type_index, int>;
+ return *map;
+}
+
+template <typename T>
+struct TypeCountingAllocator {
+ TypeCountingAllocator() = default;
+ template <typename U>
+ TypeCountingAllocator(const TypeCountingAllocator<U>&) {} // NOLINT
+
+ using value_type = T;
+
+ T* allocate(size_t n, const void* = nullptr) {
+ AllocationMap()[typeid(T)] += n;
+ return std::allocator<T>().allocate(n);
+ }
+ void deallocate(T* p, std::size_t n) {
+ AllocationMap()[typeid(T)] -= n;
+ return std::allocator<T>().deallocate(p, n);
+ }
+};
+
+TEST(Memory, AllocateDeallocateMatchType) {
+ TypeCountingAllocator<int> alloc;
+ void* mem = Allocate<1>(&alloc, 1);
+ // Verify that it was allocated
+ EXPECT_THAT(AllocationMap(), ElementsAre(Pair(_, Gt(0))));
+ Deallocate<1>(&alloc, mem, 1);
+ // Verify that the deallocation matched.
+ EXPECT_THAT(AllocationMap(), ElementsAre(Pair(_, 0)));
+}
+
+class Fixture : public ::testing::Test {
+ using Alloc = std::allocator<std::string>;
+
+ public:
+ Fixture() { ptr_ = std::allocator_traits<Alloc>::allocate(*alloc(), 1); }
+ ~Fixture() override {
+ std::allocator_traits<Alloc>::destroy(*alloc(), ptr_);
+ std::allocator_traits<Alloc>::deallocate(*alloc(), ptr_, 1);
+ }
+ std::string* ptr() { return ptr_; }
+ Alloc* alloc() { return &alloc_; }
+
+ private:
+ Alloc alloc_;
+ std::string* ptr_;
+};
+
+TEST_F(Fixture, ConstructNoArgs) {
+ ConstructFromTuple(alloc(), ptr(), std::forward_as_tuple());
+ EXPECT_EQ(*ptr(), "");
+}
+
+TEST_F(Fixture, ConstructOneArg) {
+ ConstructFromTuple(alloc(), ptr(), std::forward_as_tuple("abcde"));
+ EXPECT_EQ(*ptr(), "abcde");
+}
+
+TEST_F(Fixture, ConstructTwoArg) {
+ ConstructFromTuple(alloc(), ptr(), std::forward_as_tuple(5, 'a'));
+ EXPECT_EQ(*ptr(), "aaaaa");
+}
+
+TEST(PairArgs, NoArgs) {
+ EXPECT_THAT(PairArgs(),
+ Pair(std::forward_as_tuple(), std::forward_as_tuple()));
+}
+
+TEST(PairArgs, TwoArgs) {
+ EXPECT_EQ(
+ std::make_pair(std::forward_as_tuple(1), std::forward_as_tuple('A')),
+ PairArgs(1, 'A'));
+}
+
+TEST(PairArgs, Pair) {
+ EXPECT_EQ(
+ std::make_pair(std::forward_as_tuple(1), std::forward_as_tuple('A')),
+ PairArgs(std::make_pair(1, 'A')));
+}
+
+TEST(PairArgs, Piecewise) {
+ EXPECT_EQ(
+ std::make_pair(std::forward_as_tuple(1), std::forward_as_tuple('A')),
+ PairArgs(std::piecewise_construct, std::forward_as_tuple(1),
+ std::forward_as_tuple('A')));
+}
+
+TEST(WithConstructed, Simple) {
+ EXPECT_EQ(1, WithConstructed<absl::string_view>(
+ std::make_tuple(std::string("a")),
+ [](absl::string_view str) { return str.size(); }));
+}
+
+template <class F, class Arg>
+decltype(DecomposeValue(std::declval<F>(), std::declval<Arg>()))
+DecomposeValueImpl(int, F&& f, Arg&& arg) {
+ return DecomposeValue(std::forward<F>(f), std::forward<Arg>(arg));
+}
+
+template <class F, class Arg>
+const char* DecomposeValueImpl(char, F&& f, Arg&& arg) {
+ return "not decomposable";
+}
+
+template <class F, class Arg>
+decltype(DecomposeValueImpl(0, std::declval<F>(), std::declval<Arg>()))
+TryDecomposeValue(F&& f, Arg&& arg) {
+ return DecomposeValueImpl(0, std::forward<F>(f), std::forward<Arg>(arg));
+}
+
+TEST(DecomposeValue, Decomposable) {
+ auto f = [](const int& x, int&& y) {
+ EXPECT_EQ(&x, &y);
+ EXPECT_EQ(42, x);
+ return 'A';
+ };
+ EXPECT_EQ('A', TryDecomposeValue(f, 42));
+}
+
+TEST(DecomposeValue, NotDecomposable) {
+ auto f = [](void*) {
+ ADD_FAILURE() << "Must not be called";
+ return 'A';
+ };
+ EXPECT_STREQ("not decomposable", TryDecomposeValue(f, 42));
+}
+
+template <class F, class... Args>
+decltype(DecomposePair(std::declval<F>(), std::declval<Args>()...))
+DecomposePairImpl(int, F&& f, Args&&... args) {
+ return DecomposePair(std::forward<F>(f), std::forward<Args>(args)...);
+}
+
+template <class F, class... Args>
+const char* DecomposePairImpl(char, F&& f, Args&&... args) {
+ return "not decomposable";
+}
+
+template <class F, class... Args>
+decltype(DecomposePairImpl(0, std::declval<F>(), std::declval<Args>()...))
+TryDecomposePair(F&& f, Args&&... args) {
+ return DecomposePairImpl(0, std::forward<F>(f), std::forward<Args>(args)...);
+}
+
+TEST(DecomposePair, Decomposable) {
+ auto f = [](const int& x, std::piecewise_construct_t, std::tuple<int&&> k,
+ std::tuple<double>&& v) {
+ EXPECT_EQ(&x, &std::get<0>(k));
+ EXPECT_EQ(42, x);
+ EXPECT_EQ(0.5, std::get<0>(v));
+ return 'A';
+ };
+ EXPECT_EQ('A', TryDecomposePair(f, 42, 0.5));
+ EXPECT_EQ('A', TryDecomposePair(f, std::make_pair(42, 0.5)));
+ EXPECT_EQ('A', TryDecomposePair(f, std::piecewise_construct,
+ std::make_tuple(42), std::make_tuple(0.5)));
+}
+
+TEST(DecomposePair, NotDecomposable) {
+ auto f = [](...) {
+ ADD_FAILURE() << "Must not be called";
+ return 'A';
+ };
+ EXPECT_STREQ("not decomposable",
+ TryDecomposePair(f));
+ EXPECT_STREQ("not decomposable",
+ TryDecomposePair(f, std::piecewise_construct, std::make_tuple(),
+ std::make_tuple(0.5)));
+}
+
+TEST(MapSlotPolicy, ConstKeyAndValue) {
+ using slot_policy = map_slot_policy<const CopyableMovableInstance,
+ const CopyableMovableInstance>;
+ using slot_type = typename slot_policy::slot_type;
+
+ union Slots {
+ Slots() {}
+ ~Slots() {}
+ slot_type slots[100];
+ } slots;
+
+ std::allocator<
+ std::pair<const CopyableMovableInstance, const CopyableMovableInstance>>
+ alloc;
+ InstanceTracker tracker;
+ slot_policy::construct(&alloc, &slots.slots[0], CopyableMovableInstance(1),
+ CopyableMovableInstance(1));
+ for (int i = 0; i < 99; ++i) {
+ slot_policy::transfer(&alloc, &slots.slots[i + 1], &slots.slots[i]);
+ }
+ slot_policy::destroy(&alloc, &slots.slots[99]);
+
+ EXPECT_EQ(tracker.copies(), 0);
+}
+
+} // namespace
+} // namespace container_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/container/internal/counting_allocator.h b/third_party/abseil/src/absl/container/internal/counting_allocator.h
new file mode 100644
index 0000000..927cf08
--- /dev/null
+++ b/third_party/abseil/src/absl/container/internal/counting_allocator.h
@@ -0,0 +1,114 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_CONTAINER_INTERNAL_COUNTING_ALLOCATOR_H_
+#define ABSL_CONTAINER_INTERNAL_COUNTING_ALLOCATOR_H_
+
+#include <cstdint>
+#include <memory>
+
+#include "absl/base/config.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace container_internal {
+
+// This is a stateful allocator, but the state lives outside of the
+// allocator (in whatever test is using the allocator). This is odd
+// but helps in tests where the allocator is propagated into nested
+// containers - that chain of allocators uses the same state and is
+// thus easier to query for aggregate allocation information.
+template <typename T>
+class CountingAllocator {
+ public:
+ using Allocator = std::allocator<T>;
+ using AllocatorTraits = std::allocator_traits<Allocator>;
+ using value_type = typename AllocatorTraits::value_type;
+ using pointer = typename AllocatorTraits::pointer;
+ using const_pointer = typename AllocatorTraits::const_pointer;
+ using size_type = typename AllocatorTraits::size_type;
+ using difference_type = typename AllocatorTraits::difference_type;
+
+ CountingAllocator() = default;
+ explicit CountingAllocator(int64_t* bytes_used) : bytes_used_(bytes_used) {}
+ CountingAllocator(int64_t* bytes_used, int64_t* instance_count)
+ : bytes_used_(bytes_used), instance_count_(instance_count) {}
+
+ template <typename U>
+ CountingAllocator(const CountingAllocator<U>& x)
+ : bytes_used_(x.bytes_used_), instance_count_(x.instance_count_) {}
+
+ pointer allocate(
+ size_type n,
+ typename AllocatorTraits::const_void_pointer hint = nullptr) {
+ Allocator allocator;
+ pointer ptr = AllocatorTraits::allocate(allocator, n, hint);
+ if (bytes_used_ != nullptr) {
+ *bytes_used_ += n * sizeof(T);
+ }
+ return ptr;
+ }
+
+ void deallocate(pointer p, size_type n) {
+ Allocator allocator;
+ AllocatorTraits::deallocate(allocator, p, n);
+ if (bytes_used_ != nullptr) {
+ *bytes_used_ -= n * sizeof(T);
+ }
+ }
+
+ template <typename U, typename... Args>
+ void construct(U* p, Args&&... args) {
+ Allocator allocator;
+ AllocatorTraits::construct(allocator, p, std::forward<Args>(args)...);
+ if (instance_count_ != nullptr) {
+ *instance_count_ += 1;
+ }
+ }
+
+ template <typename U>
+ void destroy(U* p) {
+ Allocator allocator;
+ AllocatorTraits::destroy(allocator, p);
+ if (instance_count_ != nullptr) {
+ *instance_count_ -= 1;
+ }
+ }
+
+ template <typename U>
+ class rebind {
+ public:
+ using other = CountingAllocator<U>;
+ };
+
+ friend bool operator==(const CountingAllocator& a,
+ const CountingAllocator& b) {
+ return a.bytes_used_ == b.bytes_used_ &&
+ a.instance_count_ == b.instance_count_;
+ }
+
+ friend bool operator!=(const CountingAllocator& a,
+ const CountingAllocator& b) {
+ return !(a == b);
+ }
+
+ int64_t* bytes_used_ = nullptr;
+ int64_t* instance_count_ = nullptr;
+};
+
+} // namespace container_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_CONTAINER_INTERNAL_COUNTING_ALLOCATOR_H_
diff --git a/third_party/abseil/src/absl/container/internal/hash_function_defaults.h b/third_party/abseil/src/absl/container/internal/hash_function_defaults.h
new file mode 100644
index 0000000..0683422
--- /dev/null
+++ b/third_party/abseil/src/absl/container/internal/hash_function_defaults.h
@@ -0,0 +1,161 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// Define the default Hash and Eq functions for SwissTable containers.
+//
+// std::hash<T> and std::equal_to<T> are not appropriate hash and equal
+// functions for SwissTable containers. There are two reasons for this.
+//
+// SwissTable containers are power of 2 sized containers:
+//
+// This means they use the lower bits of the hash value to find the slot for
+// each entry. The typical hash function for integral types is the identity.
+// This is a very weak hash function for SwissTable and any power of 2 sized
+// hashtable implementation which will lead to excessive collisions. For
+// SwissTable we use murmur3 style mixing to reduce collisions to a minimum.
+//
+// SwissTable containers support heterogeneous lookup:
+//
+// In order to make heterogeneous lookup work, hash and equal functions must be
+// polymorphic. At the same time they have to satisfy the same requirements the
+// C++ standard imposes on hash functions and equality operators. That is:
+//
+// if hash_default_eq<T>(a, b) returns true for any a and b of type T, then
+// hash_default_hash<T>(a) must equal hash_default_hash<T>(b)
+//
+// For SwissTable containers this requirement is relaxed to allow a and b of
+// any and possibly different types. Note that like the standard the hash and
+// equal functions are still bound to T. This is important because some type U
+// can be hashed by/tested for equality differently depending on T. A notable
+// example is `const char*`. `const char*` is treated as a c-style string when
+// the hash function is hash<std::string> but as a pointer when the hash
+// function is hash<void*>.
+//
+#ifndef ABSL_CONTAINER_INTERNAL_HASH_FUNCTION_DEFAULTS_H_
+#define ABSL_CONTAINER_INTERNAL_HASH_FUNCTION_DEFAULTS_H_
+
+#include <stdint.h>
+#include <cstddef>
+#include <memory>
+#include <string>
+#include <type_traits>
+
+#include "absl/base/config.h"
+#include "absl/hash/hash.h"
+#include "absl/strings/cord.h"
+#include "absl/strings/string_view.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace container_internal {
+
+// The hash of an object of type T is computed by using absl::Hash.
+template <class T, class E = void>
+struct HashEq {
+ using Hash = absl::Hash<T>;
+ using Eq = std::equal_to<T>;
+};
+
+struct StringHash {
+ using is_transparent = void;
+
+ size_t operator()(absl::string_view v) const {
+ return absl::Hash<absl::string_view>{}(v);
+ }
+ size_t operator()(const absl::Cord& v) const {
+ return absl::Hash<absl::Cord>{}(v);
+ }
+};
+
+// Supports heterogeneous lookup for string-like elements.
+struct StringHashEq {
+ using Hash = StringHash;
+ struct Eq {
+ using is_transparent = void;
+ bool operator()(absl::string_view lhs, absl::string_view rhs) const {
+ return lhs == rhs;
+ }
+ bool operator()(const absl::Cord& lhs, const absl::Cord& rhs) const {
+ return lhs == rhs;
+ }
+ bool operator()(const absl::Cord& lhs, absl::string_view rhs) const {
+ return lhs == rhs;
+ }
+ bool operator()(absl::string_view lhs, const absl::Cord& rhs) const {
+ return lhs == rhs;
+ }
+ };
+};
+
+template <>
+struct HashEq<std::string> : StringHashEq {};
+template <>
+struct HashEq<absl::string_view> : StringHashEq {};
+template <>
+struct HashEq<absl::Cord> : StringHashEq {};
+
+// Supports heterogeneous lookup for pointers and smart pointers.
+template <class T>
+struct HashEq<T*> {
+ struct Hash {
+ using is_transparent = void;
+ template <class U>
+ size_t operator()(const U& ptr) const {
+ return absl::Hash<const T*>{}(HashEq::ToPtr(ptr));
+ }
+ };
+ struct Eq {
+ using is_transparent = void;
+ template <class A, class B>
+ bool operator()(const A& a, const B& b) const {
+ return HashEq::ToPtr(a) == HashEq::ToPtr(b);
+ }
+ };
+
+ private:
+ static const T* ToPtr(const T* ptr) { return ptr; }
+ template <class U, class D>
+ static const T* ToPtr(const std::unique_ptr<U, D>& ptr) {
+ return ptr.get();
+ }
+ template <class U>
+ static const T* ToPtr(const std::shared_ptr<U>& ptr) {
+ return ptr.get();
+ }
+};
+
+template <class T, class D>
+struct HashEq<std::unique_ptr<T, D>> : HashEq<T*> {};
+template <class T>
+struct HashEq<std::shared_ptr<T>> : HashEq<T*> {};
+
+// This header's visibility is restricted. If you need to access the default
+// hasher please use the container's ::hasher alias instead.
+//
+// Example: typename Hash = typename absl::flat_hash_map<K, V>::hasher
+template <class T>
+using hash_default_hash = typename container_internal::HashEq<T>::Hash;
+
+// This header's visibility is restricted. If you need to access the default
+// key equal please use the container's ::key_equal alias instead.
+//
+// Example: typename Eq = typename absl::flat_hash_map<K, V, Hash>::key_equal
+template <class T>
+using hash_default_eq = typename container_internal::HashEq<T>::Eq;
+
+} // namespace container_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_CONTAINER_INTERNAL_HASH_FUNCTION_DEFAULTS_H_
diff --git a/third_party/abseil/src/absl/container/internal/hash_function_defaults_test.cc b/third_party/abseil/src/absl/container/internal/hash_function_defaults_test.cc
new file mode 100644
index 0000000..59576b8
--- /dev/null
+++ b/third_party/abseil/src/absl/container/internal/hash_function_defaults_test.cc
@@ -0,0 +1,383 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/container/internal/hash_function_defaults.h"
+
+#include <functional>
+#include <type_traits>
+#include <utility>
+
+#include "gtest/gtest.h"
+#include "absl/random/random.h"
+#include "absl/strings/cord.h"
+#include "absl/strings/cord_test_helpers.h"
+#include "absl/strings/string_view.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace container_internal {
+namespace {
+
+using ::testing::Types;
+
+TEST(Eq, Int32) {
+ hash_default_eq<int32_t> eq;
+ EXPECT_TRUE(eq(1, 1u));
+ EXPECT_TRUE(eq(1, char{1}));
+ EXPECT_TRUE(eq(1, true));
+ EXPECT_TRUE(eq(1, double{1.1}));
+ EXPECT_FALSE(eq(1, char{2}));
+ EXPECT_FALSE(eq(1, 2u));
+ EXPECT_FALSE(eq(1, false));
+ EXPECT_FALSE(eq(1, 2.));
+}
+
+TEST(Hash, Int32) {
+ hash_default_hash<int32_t> hash;
+ auto h = hash(1);
+ EXPECT_EQ(h, hash(1u));
+ EXPECT_EQ(h, hash(char{1}));
+ EXPECT_EQ(h, hash(true));
+ EXPECT_EQ(h, hash(double{1.1}));
+ EXPECT_NE(h, hash(2u));
+ EXPECT_NE(h, hash(char{2}));
+ EXPECT_NE(h, hash(false));
+ EXPECT_NE(h, hash(2.));
+}
+
+enum class MyEnum { A, B, C, D };
+
+TEST(Eq, Enum) {
+ hash_default_eq<MyEnum> eq;
+ EXPECT_TRUE(eq(MyEnum::A, MyEnum::A));
+ EXPECT_FALSE(eq(MyEnum::A, MyEnum::B));
+}
+
+TEST(Hash, Enum) {
+ hash_default_hash<MyEnum> hash;
+
+ for (MyEnum e : {MyEnum::A, MyEnum::B, MyEnum::C}) {
+ auto h = hash(e);
+ EXPECT_EQ(h, hash_default_hash<int>{}(static_cast<int>(e)));
+ EXPECT_NE(h, hash(MyEnum::D));
+ }
+}
+
+using StringTypes = ::testing::Types<std::string, absl::string_view>;
+
+template <class T>
+struct EqString : ::testing::Test {
+ hash_default_eq<T> key_eq;
+};
+
+TYPED_TEST_SUITE(EqString, StringTypes);
+
+template <class T>
+struct HashString : ::testing::Test {
+ hash_default_hash<T> hasher;
+};
+
+TYPED_TEST_SUITE(HashString, StringTypes);
+
+TYPED_TEST(EqString, Works) {
+ auto eq = this->key_eq;
+ EXPECT_TRUE(eq("a", "a"));
+ EXPECT_TRUE(eq("a", absl::string_view("a")));
+ EXPECT_TRUE(eq("a", std::string("a")));
+ EXPECT_FALSE(eq("a", "b"));
+ EXPECT_FALSE(eq("a", absl::string_view("b")));
+ EXPECT_FALSE(eq("a", std::string("b")));
+}
+
+TYPED_TEST(HashString, Works) {
+ auto hash = this->hasher;
+ auto h = hash("a");
+ EXPECT_EQ(h, hash(absl::string_view("a")));
+ EXPECT_EQ(h, hash(std::string("a")));
+ EXPECT_NE(h, hash(absl::string_view("b")));
+ EXPECT_NE(h, hash(std::string("b")));
+}
+
+struct NoDeleter {
+ template <class T>
+ void operator()(const T* ptr) const {}
+};
+
+using PointerTypes =
+ ::testing::Types<const int*, int*, std::unique_ptr<const int>,
+ std::unique_ptr<const int, NoDeleter>,
+ std::unique_ptr<int>, std::unique_ptr<int, NoDeleter>,
+ std::shared_ptr<const int>, std::shared_ptr<int>>;
+
+template <class T>
+struct EqPointer : ::testing::Test {
+ hash_default_eq<T> key_eq;
+};
+
+TYPED_TEST_SUITE(EqPointer, PointerTypes);
+
+template <class T>
+struct HashPointer : ::testing::Test {
+ hash_default_hash<T> hasher;
+};
+
+TYPED_TEST_SUITE(HashPointer, PointerTypes);
+
+TYPED_TEST(EqPointer, Works) {
+ int dummy;
+ auto eq = this->key_eq;
+ auto sptr = std::make_shared<int>();
+ std::shared_ptr<const int> csptr = sptr;
+ int* ptr = sptr.get();
+ const int* cptr = ptr;
+ std::unique_ptr<int, NoDeleter> uptr(ptr);
+ std::unique_ptr<const int, NoDeleter> cuptr(ptr);
+
+ EXPECT_TRUE(eq(ptr, cptr));
+ EXPECT_TRUE(eq(ptr, sptr));
+ EXPECT_TRUE(eq(ptr, uptr));
+ EXPECT_TRUE(eq(ptr, csptr));
+ EXPECT_TRUE(eq(ptr, cuptr));
+ EXPECT_FALSE(eq(&dummy, cptr));
+ EXPECT_FALSE(eq(&dummy, sptr));
+ EXPECT_FALSE(eq(&dummy, uptr));
+ EXPECT_FALSE(eq(&dummy, csptr));
+ EXPECT_FALSE(eq(&dummy, cuptr));
+}
+
+TEST(Hash, DerivedAndBase) {
+ struct Base {};
+ struct Derived : Base {};
+
+ hash_default_hash<Base*> hasher;
+
+ Base base;
+ Derived derived;
+ EXPECT_NE(hasher(&base), hasher(&derived));
+ EXPECT_EQ(hasher(static_cast<Base*>(&derived)), hasher(&derived));
+
+ auto dp = std::make_shared<Derived>();
+ EXPECT_EQ(hasher(static_cast<Base*>(dp.get())), hasher(dp));
+}
+
+TEST(Hash, FunctionPointer) {
+ using Func = int (*)();
+ hash_default_hash<Func> hasher;
+ hash_default_eq<Func> eq;
+
+ Func p1 = [] { return 1; }, p2 = [] { return 2; };
+ EXPECT_EQ(hasher(p1), hasher(p1));
+ EXPECT_TRUE(eq(p1, p1));
+
+ EXPECT_NE(hasher(p1), hasher(p2));
+ EXPECT_FALSE(eq(p1, p2));
+}
+
+TYPED_TEST(HashPointer, Works) {
+ int dummy;
+ auto hash = this->hasher;
+ auto sptr = std::make_shared<int>();
+ std::shared_ptr<const int> csptr = sptr;
+ int* ptr = sptr.get();
+ const int* cptr = ptr;
+ std::unique_ptr<int, NoDeleter> uptr(ptr);
+ std::unique_ptr<const int, NoDeleter> cuptr(ptr);
+
+ EXPECT_EQ(hash(ptr), hash(cptr));
+ EXPECT_EQ(hash(ptr), hash(sptr));
+ EXPECT_EQ(hash(ptr), hash(uptr));
+ EXPECT_EQ(hash(ptr), hash(csptr));
+ EXPECT_EQ(hash(ptr), hash(cuptr));
+ EXPECT_NE(hash(&dummy), hash(cptr));
+ EXPECT_NE(hash(&dummy), hash(sptr));
+ EXPECT_NE(hash(&dummy), hash(uptr));
+ EXPECT_NE(hash(&dummy), hash(csptr));
+ EXPECT_NE(hash(&dummy), hash(cuptr));
+}
+
+TEST(EqCord, Works) {
+ hash_default_eq<absl::Cord> eq;
+ const absl::string_view a_string_view = "a";
+ const absl::Cord a_cord(a_string_view);
+ const absl::string_view b_string_view = "b";
+ const absl::Cord b_cord(b_string_view);
+
+ EXPECT_TRUE(eq(a_cord, a_cord));
+ EXPECT_TRUE(eq(a_cord, a_string_view));
+ EXPECT_TRUE(eq(a_string_view, a_cord));
+ EXPECT_FALSE(eq(a_cord, b_cord));
+ EXPECT_FALSE(eq(a_cord, b_string_view));
+ EXPECT_FALSE(eq(b_string_view, a_cord));
+}
+
+TEST(HashCord, Works) {
+ hash_default_hash<absl::Cord> hash;
+ const absl::string_view a_string_view = "a";
+ const absl::Cord a_cord(a_string_view);
+ const absl::string_view b_string_view = "b";
+ const absl::Cord b_cord(b_string_view);
+
+ EXPECT_EQ(hash(a_cord), hash(a_cord));
+ EXPECT_EQ(hash(b_cord), hash(b_cord));
+ EXPECT_EQ(hash(a_string_view), hash(a_cord));
+ EXPECT_EQ(hash(b_string_view), hash(b_cord));
+ EXPECT_EQ(hash(absl::Cord("")), hash(""));
+ EXPECT_EQ(hash(absl::Cord()), hash(absl::string_view()));
+
+ EXPECT_NE(hash(a_cord), hash(b_cord));
+ EXPECT_NE(hash(a_cord), hash(b_string_view));
+ EXPECT_NE(hash(a_string_view), hash(b_cord));
+ EXPECT_NE(hash(a_string_view), hash(b_string_view));
+}
+
+void NoOpReleaser(absl::string_view data, void* arg) {}
+
+TEST(HashCord, FragmentedCordWorks) {
+ hash_default_hash<absl::Cord> hash;
+ absl::Cord c = absl::MakeFragmentedCord({"a", "b", "c"});
+ EXPECT_FALSE(c.TryFlat().has_value());
+ EXPECT_EQ(hash(c), hash("abc"));
+}
+
+TEST(HashCord, FragmentedLongCordWorks) {
+ hash_default_hash<absl::Cord> hash;
+ // Crete some large strings which do not fit on the stack.
+ std::string a(65536, 'a');
+ std::string b(65536, 'b');
+ absl::Cord c = absl::MakeFragmentedCord({a, b});
+ EXPECT_FALSE(c.TryFlat().has_value());
+ EXPECT_EQ(hash(c), hash(a + b));
+}
+
+TEST(HashCord, RandomCord) {
+ hash_default_hash<absl::Cord> hash;
+ auto bitgen = absl::BitGen();
+ for (int i = 0; i < 1000; ++i) {
+ const int number_of_segments = absl::Uniform(bitgen, 0, 10);
+ std::vector<std::string> pieces;
+ for (size_t s = 0; s < number_of_segments; ++s) {
+ std::string str;
+ str.resize(absl::Uniform(bitgen, 0, 4096));
+ // MSVC needed the explicit return type in the lambda.
+ std::generate(str.begin(), str.end(), [&]() -> char {
+ return static_cast<char>(absl::Uniform<unsigned char>(bitgen));
+ });
+ pieces.push_back(str);
+ }
+ absl::Cord c = absl::MakeFragmentedCord(pieces);
+ EXPECT_EQ(hash(c), hash(std::string(c)));
+ }
+}
+
+// Cartesian product of (std::string, absl::string_view)
+// with (std::string, absl::string_view, const char*, absl::Cord).
+using StringTypesCartesianProduct = Types<
+ // clang-format off
+ std::pair<absl::Cord, std::string>,
+ std::pair<absl::Cord, absl::string_view>,
+ std::pair<absl::Cord, absl::Cord>,
+ std::pair<absl::Cord, const char*>,
+
+ std::pair<std::string, absl::Cord>,
+ std::pair<absl::string_view, absl::Cord>,
+
+ std::pair<absl::string_view, std::string>,
+ std::pair<absl::string_view, absl::string_view>,
+ std::pair<absl::string_view, const char*>>;
+// clang-format on
+
+constexpr char kFirstString[] = "abc123";
+constexpr char kSecondString[] = "ijk456";
+
+template <typename T>
+struct StringLikeTest : public ::testing::Test {
+ typename T::first_type a1{kFirstString};
+ typename T::second_type b1{kFirstString};
+ typename T::first_type a2{kSecondString};
+ typename T::second_type b2{kSecondString};
+ hash_default_eq<typename T::first_type> eq;
+ hash_default_hash<typename T::first_type> hash;
+};
+
+TYPED_TEST_CASE_P(StringLikeTest);
+
+TYPED_TEST_P(StringLikeTest, Eq) {
+ EXPECT_TRUE(this->eq(this->a1, this->b1));
+ EXPECT_TRUE(this->eq(this->b1, this->a1));
+}
+
+TYPED_TEST_P(StringLikeTest, NotEq) {
+ EXPECT_FALSE(this->eq(this->a1, this->b2));
+ EXPECT_FALSE(this->eq(this->b2, this->a1));
+}
+
+TYPED_TEST_P(StringLikeTest, HashEq) {
+ EXPECT_EQ(this->hash(this->a1), this->hash(this->b1));
+ EXPECT_EQ(this->hash(this->a2), this->hash(this->b2));
+ // It would be a poor hash function which collides on these strings.
+ EXPECT_NE(this->hash(this->a1), this->hash(this->b2));
+}
+
+TYPED_TEST_SUITE(StringLikeTest, StringTypesCartesianProduct);
+
+} // namespace
+} // namespace container_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+enum Hash : size_t {
+ kStd = 0x1, // std::hash
+#ifdef _MSC_VER
+ kExtension = kStd, // In MSVC, std::hash == ::hash
+#else // _MSC_VER
+ kExtension = 0x2, // ::hash (GCC extension)
+#endif // _MSC_VER
+};
+
+// H is a bitmask of Hash enumerations.
+// Hashable<H> is hashable via all means specified in H.
+template <int H>
+struct Hashable {
+ static constexpr bool HashableBy(Hash h) { return h & H; }
+};
+
+namespace std {
+template <int H>
+struct hash<Hashable<H>> {
+ template <class E = Hashable<H>,
+ class = typename std::enable_if<E::HashableBy(kStd)>::type>
+ size_t operator()(E) const {
+ return kStd;
+ }
+};
+} // namespace std
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace container_internal {
+namespace {
+
+template <class T>
+size_t Hash(const T& v) {
+ return hash_default_hash<T>()(v);
+}
+
+TEST(Delegate, HashDispatch) {
+ EXPECT_EQ(Hash(kStd), Hash(Hashable<kStd>()));
+}
+
+} // namespace
+} // namespace container_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/container/internal/hash_generator_testing.cc b/third_party/abseil/src/absl/container/internal/hash_generator_testing.cc
new file mode 100644
index 0000000..59cc5aa
--- /dev/null
+++ b/third_party/abseil/src/absl/container/internal/hash_generator_testing.cc
@@ -0,0 +1,76 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/container/internal/hash_generator_testing.h"
+
+#include <deque>
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace container_internal {
+namespace hash_internal {
+namespace {
+
+class RandomDeviceSeedSeq {
+ public:
+ using result_type = typename std::random_device::result_type;
+
+ template <class Iterator>
+ void generate(Iterator start, Iterator end) {
+ while (start != end) {
+ *start = gen_();
+ ++start;
+ }
+ }
+
+ private:
+ std::random_device gen_;
+};
+
+} // namespace
+
+std::mt19937_64* GetSharedRng() {
+ static auto* rng = [] {
+ RandomDeviceSeedSeq seed_seq;
+ return new std::mt19937_64(seed_seq);
+ }();
+ return rng;
+}
+
+std::string Generator<std::string>::operator()() const {
+ // NOLINTNEXTLINE(runtime/int)
+ std::uniform_int_distribution<short> chars(0x20, 0x7E);
+ std::string res;
+ res.resize(32);
+ std::generate(res.begin(), res.end(),
+ [&]() { return chars(*GetSharedRng()); });
+ return res;
+}
+
+absl::string_view Generator<absl::string_view>::operator()() const {
+ static auto* arena = new std::deque<std::string>();
+ // NOLINTNEXTLINE(runtime/int)
+ std::uniform_int_distribution<short> chars(0x20, 0x7E);
+ arena->emplace_back();
+ auto& res = arena->back();
+ res.resize(32);
+ std::generate(res.begin(), res.end(),
+ [&]() { return chars(*GetSharedRng()); });
+ return res;
+}
+
+} // namespace hash_internal
+} // namespace container_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/container/internal/hash_generator_testing.h b/third_party/abseil/src/absl/container/internal/hash_generator_testing.h
new file mode 100644
index 0000000..6869fe4
--- /dev/null
+++ b/third_party/abseil/src/absl/container/internal/hash_generator_testing.h
@@ -0,0 +1,161 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// Generates random values for testing. Specialized only for the few types we
+// care about.
+
+#ifndef ABSL_CONTAINER_INTERNAL_HASH_GENERATOR_TESTING_H_
+#define ABSL_CONTAINER_INTERNAL_HASH_GENERATOR_TESTING_H_
+
+#include <stdint.h>
+
+#include <algorithm>
+#include <iosfwd>
+#include <random>
+#include <tuple>
+#include <type_traits>
+#include <utility>
+
+#include "absl/container/internal/hash_policy_testing.h"
+#include "absl/memory/memory.h"
+#include "absl/meta/type_traits.h"
+#include "absl/strings/string_view.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace container_internal {
+namespace hash_internal {
+namespace generator_internal {
+
+template <class Container, class = void>
+struct IsMap : std::false_type {};
+
+template <class Map>
+struct IsMap<Map, absl::void_t<typename Map::mapped_type>> : std::true_type {};
+
+} // namespace generator_internal
+
+std::mt19937_64* GetSharedRng();
+
+enum Enum {
+ kEnumEmpty,
+ kEnumDeleted,
+};
+
+enum class EnumClass : uint64_t {
+ kEmpty,
+ kDeleted,
+};
+
+inline std::ostream& operator<<(std::ostream& o, const EnumClass& ec) {
+ return o << static_cast<uint64_t>(ec);
+}
+
+template <class T, class E = void>
+struct Generator;
+
+template <class T>
+struct Generator<T, typename std::enable_if<std::is_integral<T>::value>::type> {
+ T operator()() const {
+ std::uniform_int_distribution<T> dist;
+ return dist(*GetSharedRng());
+ }
+};
+
+template <>
+struct Generator<Enum> {
+ Enum operator()() const {
+ std::uniform_int_distribution<typename std::underlying_type<Enum>::type>
+ dist;
+ while (true) {
+ auto variate = dist(*GetSharedRng());
+ if (variate != kEnumEmpty && variate != kEnumDeleted)
+ return static_cast<Enum>(variate);
+ }
+ }
+};
+
+template <>
+struct Generator<EnumClass> {
+ EnumClass operator()() const {
+ std::uniform_int_distribution<
+ typename std::underlying_type<EnumClass>::type>
+ dist;
+ while (true) {
+ EnumClass variate = static_cast<EnumClass>(dist(*GetSharedRng()));
+ if (variate != EnumClass::kEmpty && variate != EnumClass::kDeleted)
+ return static_cast<EnumClass>(variate);
+ }
+ }
+};
+
+template <>
+struct Generator<std::string> {
+ std::string operator()() const;
+};
+
+template <>
+struct Generator<absl::string_view> {
+ absl::string_view operator()() const;
+};
+
+template <>
+struct Generator<NonStandardLayout> {
+ NonStandardLayout operator()() const {
+ return NonStandardLayout(Generator<std::string>()());
+ }
+};
+
+template <class K, class V>
+struct Generator<std::pair<K, V>> {
+ std::pair<K, V> operator()() const {
+ return std::pair<K, V>(Generator<typename std::decay<K>::type>()(),
+ Generator<typename std::decay<V>::type>()());
+ }
+};
+
+template <class... Ts>
+struct Generator<std::tuple<Ts...>> {
+ std::tuple<Ts...> operator()() const {
+ return std::tuple<Ts...>(Generator<typename std::decay<Ts>::type>()()...);
+ }
+};
+
+template <class T>
+struct Generator<std::unique_ptr<T>> {
+ std::unique_ptr<T> operator()() const {
+ return absl::make_unique<T>(Generator<T>()());
+ }
+};
+
+template <class U>
+struct Generator<U, absl::void_t<decltype(std::declval<U&>().key()),
+ decltype(std::declval<U&>().value())>>
+ : Generator<std::pair<
+ typename std::decay<decltype(std::declval<U&>().key())>::type,
+ typename std::decay<decltype(std::declval<U&>().value())>::type>> {};
+
+template <class Container>
+using GeneratedType = decltype(
+ std::declval<const Generator<
+ typename std::conditional<generator_internal::IsMap<Container>::value,
+ typename Container::value_type,
+ typename Container::key_type>::type>&>()());
+
+} // namespace hash_internal
+} // namespace container_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_CONTAINER_INTERNAL_HASH_GENERATOR_TESTING_H_
diff --git a/third_party/abseil/src/absl/container/internal/hash_policy_testing.h b/third_party/abseil/src/absl/container/internal/hash_policy_testing.h
new file mode 100644
index 0000000..01c40d2
--- /dev/null
+++ b/third_party/abseil/src/absl/container/internal/hash_policy_testing.h
@@ -0,0 +1,184 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// Utilities to help tests verify that hash tables properly handle stateful
+// allocators and hash functions.
+
+#ifndef ABSL_CONTAINER_INTERNAL_HASH_POLICY_TESTING_H_
+#define ABSL_CONTAINER_INTERNAL_HASH_POLICY_TESTING_H_
+
+#include <cstdlib>
+#include <limits>
+#include <memory>
+#include <ostream>
+#include <type_traits>
+#include <utility>
+#include <vector>
+
+#include "absl/hash/hash.h"
+#include "absl/strings/string_view.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace container_internal {
+namespace hash_testing_internal {
+
+template <class Derived>
+struct WithId {
+ WithId() : id_(next_id<Derived>()) {}
+ WithId(const WithId& that) : id_(that.id_) {}
+ WithId(WithId&& that) : id_(that.id_) { that.id_ = 0; }
+ WithId& operator=(const WithId& that) {
+ id_ = that.id_;
+ return *this;
+ }
+ WithId& operator=(WithId&& that) {
+ id_ = that.id_;
+ that.id_ = 0;
+ return *this;
+ }
+
+ size_t id() const { return id_; }
+
+ friend bool operator==(const WithId& a, const WithId& b) {
+ return a.id_ == b.id_;
+ }
+ friend bool operator!=(const WithId& a, const WithId& b) { return !(a == b); }
+
+ protected:
+ explicit WithId(size_t id) : id_(id) {}
+
+ private:
+ size_t id_;
+
+ template <class T>
+ static size_t next_id() {
+ // 0 is reserved for moved from state.
+ static size_t gId = 1;
+ return gId++;
+ }
+};
+
+} // namespace hash_testing_internal
+
+struct NonStandardLayout {
+ NonStandardLayout() {}
+ explicit NonStandardLayout(std::string s) : value(std::move(s)) {}
+ virtual ~NonStandardLayout() {}
+
+ friend bool operator==(const NonStandardLayout& a,
+ const NonStandardLayout& b) {
+ return a.value == b.value;
+ }
+ friend bool operator!=(const NonStandardLayout& a,
+ const NonStandardLayout& b) {
+ return a.value != b.value;
+ }
+
+ template <typename H>
+ friend H AbslHashValue(H h, const NonStandardLayout& v) {
+ return H::combine(std::move(h), v.value);
+ }
+
+ std::string value;
+};
+
+struct StatefulTestingHash
+ : absl::container_internal::hash_testing_internal::WithId<
+ StatefulTestingHash> {
+ template <class T>
+ size_t operator()(const T& t) const {
+ return absl::Hash<T>{}(t);
+ }
+};
+
+struct StatefulTestingEqual
+ : absl::container_internal::hash_testing_internal::WithId<
+ StatefulTestingEqual> {
+ template <class T, class U>
+ bool operator()(const T& t, const U& u) const {
+ return t == u;
+ }
+};
+
+// It is expected that Alloc() == Alloc() for all allocators so we cannot use
+// WithId base. We need to explicitly assign ids.
+template <class T = int>
+struct Alloc : std::allocator<T> {
+ using propagate_on_container_swap = std::true_type;
+
+ // Using old paradigm for this to ensure compatibility.
+ explicit Alloc(size_t id = 0) : id_(id) {}
+
+ Alloc(const Alloc&) = default;
+ Alloc& operator=(const Alloc&) = default;
+
+ template <class U>
+ Alloc(const Alloc<U>& that) : std::allocator<T>(that), id_(that.id()) {}
+
+ template <class U>
+ struct rebind {
+ using other = Alloc<U>;
+ };
+
+ size_t id() const { return id_; }
+
+ friend bool operator==(const Alloc& a, const Alloc& b) {
+ return a.id_ == b.id_;
+ }
+ friend bool operator!=(const Alloc& a, const Alloc& b) { return !(a == b); }
+
+ private:
+ size_t id_ = (std::numeric_limits<size_t>::max)();
+};
+
+template <class Map>
+auto items(const Map& m) -> std::vector<
+ std::pair<typename Map::key_type, typename Map::mapped_type>> {
+ using std::get;
+ std::vector<std::pair<typename Map::key_type, typename Map::mapped_type>> res;
+ res.reserve(m.size());
+ for (const auto& v : m) res.emplace_back(get<0>(v), get<1>(v));
+ return res;
+}
+
+template <class Set>
+auto keys(const Set& s)
+ -> std::vector<typename std::decay<typename Set::key_type>::type> {
+ std::vector<typename std::decay<typename Set::key_type>::type> res;
+ res.reserve(s.size());
+ for (const auto& v : s) res.emplace_back(v);
+ return res;
+}
+
+} // namespace container_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+// ABSL_UNORDERED_SUPPORTS_ALLOC_CTORS is false for glibcxx versions
+// where the unordered containers are missing certain constructors that
+// take allocator arguments. This test is defined ad-hoc for the platforms
+// we care about (notably Crosstool 17) because libstdcxx's useless
+// versioning scheme precludes a more principled solution.
+// From GCC-4.9 Changelog: (src: https://gcc.gnu.org/gcc-4.9/changes.html)
+// "the unordered associative containers in <unordered_map> and <unordered_set>
+// meet the allocator-aware container requirements;"
+#if (defined(__GLIBCXX__) && __GLIBCXX__ <= 20140425 ) || \
+( __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 9 ))
+#define ABSL_UNORDERED_SUPPORTS_ALLOC_CTORS 0
+#else
+#define ABSL_UNORDERED_SUPPORTS_ALLOC_CTORS 1
+#endif
+
+#endif // ABSL_CONTAINER_INTERNAL_HASH_POLICY_TESTING_H_
diff --git a/third_party/abseil/src/absl/container/internal/hash_policy_testing_test.cc b/third_party/abseil/src/absl/container/internal/hash_policy_testing_test.cc
new file mode 100644
index 0000000..f0b20fe
--- /dev/null
+++ b/third_party/abseil/src/absl/container/internal/hash_policy_testing_test.cc
@@ -0,0 +1,45 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/container/internal/hash_policy_testing.h"
+
+#include "gtest/gtest.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace container_internal {
+namespace {
+
+TEST(_, Hash) {
+ StatefulTestingHash h1;
+ EXPECT_EQ(1, h1.id());
+ StatefulTestingHash h2;
+ EXPECT_EQ(2, h2.id());
+ StatefulTestingHash h1c(h1);
+ EXPECT_EQ(1, h1c.id());
+ StatefulTestingHash h2m(std::move(h2));
+ EXPECT_EQ(2, h2m.id());
+ EXPECT_EQ(0, h2.id());
+ StatefulTestingHash h3;
+ EXPECT_EQ(3, h3.id());
+ h3 = StatefulTestingHash();
+ EXPECT_EQ(4, h3.id());
+ h3 = std::move(h1);
+ EXPECT_EQ(1, h3.id());
+}
+
+} // namespace
+} // namespace container_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/container/internal/hash_policy_traits.h b/third_party/abseil/src/absl/container/internal/hash_policy_traits.h
new file mode 100644
index 0000000..46c97b1
--- /dev/null
+++ b/third_party/abseil/src/absl/container/internal/hash_policy_traits.h
@@ -0,0 +1,208 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_CONTAINER_INTERNAL_HASH_POLICY_TRAITS_H_
+#define ABSL_CONTAINER_INTERNAL_HASH_POLICY_TRAITS_H_
+
+#include <cstddef>
+#include <memory>
+#include <new>
+#include <type_traits>
+#include <utility>
+
+#include "absl/meta/type_traits.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace container_internal {
+
+// Defines how slots are initialized/destroyed/moved.
+template <class Policy, class = void>
+struct hash_policy_traits {
+ // The type of the keys stored in the hashtable.
+ using key_type = typename Policy::key_type;
+
+ private:
+ struct ReturnKey {
+ // When C++17 is available, we can use std::launder to provide mutable
+ // access to the key for use in node handle.
+#if defined(__cpp_lib_launder) && __cpp_lib_launder >= 201606
+ template <class Key,
+ absl::enable_if_t<std::is_lvalue_reference<Key>::value, int> = 0>
+ static key_type& Impl(Key&& k, int) {
+ return *std::launder(
+ const_cast<key_type*>(std::addressof(std::forward<Key>(k))));
+ }
+#endif
+
+ template <class Key>
+ static Key Impl(Key&& k, char) {
+ return std::forward<Key>(k);
+ }
+
+ // When Key=T&, we forward the lvalue reference.
+ // When Key=T, we return by value to avoid a dangling reference.
+ // eg, for string_hash_map.
+ template <class Key, class... Args>
+ auto operator()(Key&& k, const Args&...) const
+ -> decltype(Impl(std::forward<Key>(k), 0)) {
+ return Impl(std::forward<Key>(k), 0);
+ }
+ };
+
+ template <class P = Policy, class = void>
+ struct ConstantIteratorsImpl : std::false_type {};
+
+ template <class P>
+ struct ConstantIteratorsImpl<P, absl::void_t<typename P::constant_iterators>>
+ : P::constant_iterators {};
+
+ public:
+ // The actual object stored in the hash table.
+ using slot_type = typename Policy::slot_type;
+
+ // The argument type for insertions into the hashtable. This is different
+ // from value_type for increased performance. See initializer_list constructor
+ // and insert() member functions for more details.
+ using init_type = typename Policy::init_type;
+
+ using reference = decltype(Policy::element(std::declval<slot_type*>()));
+ using pointer = typename std::remove_reference<reference>::type*;
+ using value_type = typename std::remove_reference<reference>::type;
+
+ // Policies can set this variable to tell raw_hash_set that all iterators
+ // should be constant, even `iterator`. This is useful for set-like
+ // containers.
+ // Defaults to false if not provided by the policy.
+ using constant_iterators = ConstantIteratorsImpl<>;
+
+ // PRECONDITION: `slot` is UNINITIALIZED
+ // POSTCONDITION: `slot` is INITIALIZED
+ template <class Alloc, class... Args>
+ static void construct(Alloc* alloc, slot_type* slot, Args&&... args) {
+ Policy::construct(alloc, slot, std::forward<Args>(args)...);
+ }
+
+ // PRECONDITION: `slot` is INITIALIZED
+ // POSTCONDITION: `slot` is UNINITIALIZED
+ template <class Alloc>
+ static void destroy(Alloc* alloc, slot_type* slot) {
+ Policy::destroy(alloc, slot);
+ }
+
+ // Transfers the `old_slot` to `new_slot`. Any memory allocated by the
+ // allocator inside `old_slot` to `new_slot` can be transferred.
+ //
+ // OPTIONAL: defaults to:
+ //
+ // clone(new_slot, std::move(*old_slot));
+ // destroy(old_slot);
+ //
+ // PRECONDITION: `new_slot` is UNINITIALIZED and `old_slot` is INITIALIZED
+ // POSTCONDITION: `new_slot` is INITIALIZED and `old_slot` is
+ // UNINITIALIZED
+ template <class Alloc>
+ static void transfer(Alloc* alloc, slot_type* new_slot, slot_type* old_slot) {
+ transfer_impl(alloc, new_slot, old_slot, 0);
+ }
+
+ // PRECONDITION: `slot` is INITIALIZED
+ // POSTCONDITION: `slot` is INITIALIZED
+ template <class P = Policy>
+ static auto element(slot_type* slot) -> decltype(P::element(slot)) {
+ return P::element(slot);
+ }
+
+ // Returns the amount of memory owned by `slot`, exclusive of `sizeof(*slot)`.
+ //
+ // If `slot` is nullptr, returns the constant amount of memory owned by any
+ // full slot or -1 if slots own variable amounts of memory.
+ //
+ // PRECONDITION: `slot` is INITIALIZED or nullptr
+ template <class P = Policy>
+ static size_t space_used(const slot_type* slot) {
+ return P::space_used(slot);
+ }
+
+ // Provides generalized access to the key for elements, both for elements in
+ // the table and for elements that have not yet been inserted (or even
+ // constructed). We would like an API that allows us to say: `key(args...)`
+ // but we cannot do that for all cases, so we use this more general API that
+ // can be used for many things, including the following:
+ //
+ // - Given an element in a table, get its key.
+ // - Given an element initializer, get its key.
+ // - Given `emplace()` arguments, get the element key.
+ //
+ // Implementations of this must adhere to a very strict technical
+ // specification around aliasing and consuming arguments:
+ //
+ // Let `value_type` be the result type of `element()` without ref- and
+ // cv-qualifiers. The first argument is a functor, the rest are constructor
+ // arguments for `value_type`. Returns `std::forward<F>(f)(k, xs...)`, where
+ // `k` is the element key, and `xs...` are the new constructor arguments for
+ // `value_type`. It's allowed for `k` to alias `xs...`, and for both to alias
+ // `ts...`. The key won't be touched once `xs...` are used to construct an
+ // element; `ts...` won't be touched at all, which allows `apply()` to consume
+ // any rvalues among them.
+ //
+ // If `value_type` is constructible from `Ts&&...`, `Policy::apply()` must not
+ // trigger a hard compile error unless it originates from `f`. In other words,
+ // `Policy::apply()` must be SFINAE-friendly. If `value_type` is not
+ // constructible from `Ts&&...`, either SFINAE or a hard compile error is OK.
+ //
+ // If `Ts...` is `[cv] value_type[&]` or `[cv] init_type[&]`,
+ // `Policy::apply()` must work. A compile error is not allowed, SFINAE or not.
+ template <class F, class... Ts, class P = Policy>
+ static auto apply(F&& f, Ts&&... ts)
+ -> decltype(P::apply(std::forward<F>(f), std::forward<Ts>(ts)...)) {
+ return P::apply(std::forward<F>(f), std::forward<Ts>(ts)...);
+ }
+
+ // Returns the "key" portion of the slot.
+ // Used for node handle manipulation.
+ template <class P = Policy>
+ static auto mutable_key(slot_type* slot)
+ -> decltype(P::apply(ReturnKey(), element(slot))) {
+ return P::apply(ReturnKey(), element(slot));
+ }
+
+ // Returns the "value" (as opposed to the "key") portion of the element. Used
+ // by maps to implement `operator[]`, `at()` and `insert_or_assign()`.
+ template <class T, class P = Policy>
+ static auto value(T* elem) -> decltype(P::value(elem)) {
+ return P::value(elem);
+ }
+
+ private:
+ // Use auto -> decltype as an enabler.
+ template <class Alloc, class P = Policy>
+ static auto transfer_impl(Alloc* alloc, slot_type* new_slot,
+ slot_type* old_slot, int)
+ -> decltype((void)P::transfer(alloc, new_slot, old_slot)) {
+ P::transfer(alloc, new_slot, old_slot);
+ }
+ template <class Alloc>
+ static void transfer_impl(Alloc* alloc, slot_type* new_slot,
+ slot_type* old_slot, char) {
+ construct(alloc, new_slot, std::move(element(old_slot)));
+ destroy(alloc, old_slot);
+ }
+};
+
+} // namespace container_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_CONTAINER_INTERNAL_HASH_POLICY_TRAITS_H_
diff --git a/third_party/abseil/src/absl/container/internal/hash_policy_traits_test.cc b/third_party/abseil/src/absl/container/internal/hash_policy_traits_test.cc
new file mode 100644
index 0000000..6ef8b9e
--- /dev/null
+++ b/third_party/abseil/src/absl/container/internal/hash_policy_traits_test.cc
@@ -0,0 +1,144 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/container/internal/hash_policy_traits.h"
+
+#include <functional>
+#include <memory>
+#include <new>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace container_internal {
+namespace {
+
+using ::testing::MockFunction;
+using ::testing::Return;
+using ::testing::ReturnRef;
+
+using Alloc = std::allocator<int>;
+using Slot = int;
+
+struct PolicyWithoutOptionalOps {
+ using slot_type = Slot;
+ using key_type = Slot;
+ using init_type = Slot;
+
+ static std::function<void(void*, Slot*, Slot)> construct;
+ static std::function<void(void*, Slot*)> destroy;
+
+ static std::function<Slot&(Slot*)> element;
+ static int apply(int v) { return apply_impl(v); }
+ static std::function<int(int)> apply_impl;
+ static std::function<Slot&(Slot*)> value;
+};
+
+std::function<void(void*, Slot*, Slot)> PolicyWithoutOptionalOps::construct;
+std::function<void(void*, Slot*)> PolicyWithoutOptionalOps::destroy;
+
+std::function<Slot&(Slot*)> PolicyWithoutOptionalOps::element;
+std::function<int(int)> PolicyWithoutOptionalOps::apply_impl;
+std::function<Slot&(Slot*)> PolicyWithoutOptionalOps::value;
+
+struct PolicyWithOptionalOps : PolicyWithoutOptionalOps {
+ static std::function<void(void*, Slot*, Slot*)> transfer;
+};
+
+std::function<void(void*, Slot*, Slot*)> PolicyWithOptionalOps::transfer;
+
+struct Test : ::testing::Test {
+ Test() {
+ PolicyWithoutOptionalOps::construct = [&](void* a1, Slot* a2, Slot a3) {
+ construct.Call(a1, a2, std::move(a3));
+ };
+ PolicyWithoutOptionalOps::destroy = [&](void* a1, Slot* a2) {
+ destroy.Call(a1, a2);
+ };
+
+ PolicyWithoutOptionalOps::element = [&](Slot* a1) -> Slot& {
+ return element.Call(a1);
+ };
+ PolicyWithoutOptionalOps::apply_impl = [&](int a1) -> int {
+ return apply.Call(a1);
+ };
+ PolicyWithoutOptionalOps::value = [&](Slot* a1) -> Slot& {
+ return value.Call(a1);
+ };
+
+ PolicyWithOptionalOps::transfer = [&](void* a1, Slot* a2, Slot* a3) {
+ return transfer.Call(a1, a2, a3);
+ };
+ }
+
+ std::allocator<int> alloc;
+ int a = 53;
+
+ MockFunction<void(void*, Slot*, Slot)> construct;
+ MockFunction<void(void*, Slot*)> destroy;
+
+ MockFunction<Slot&(Slot*)> element;
+ MockFunction<int(int)> apply;
+ MockFunction<Slot&(Slot*)> value;
+
+ MockFunction<void(void*, Slot*, Slot*)> transfer;
+};
+
+TEST_F(Test, construct) {
+ EXPECT_CALL(construct, Call(&alloc, &a, 53));
+ hash_policy_traits<PolicyWithoutOptionalOps>::construct(&alloc, &a, 53);
+}
+
+TEST_F(Test, destroy) {
+ EXPECT_CALL(destroy, Call(&alloc, &a));
+ hash_policy_traits<PolicyWithoutOptionalOps>::destroy(&alloc, &a);
+}
+
+TEST_F(Test, element) {
+ int b = 0;
+ EXPECT_CALL(element, Call(&a)).WillOnce(ReturnRef(b));
+ EXPECT_EQ(&b, &hash_policy_traits<PolicyWithoutOptionalOps>::element(&a));
+}
+
+TEST_F(Test, apply) {
+ EXPECT_CALL(apply, Call(42)).WillOnce(Return(1337));
+ EXPECT_EQ(1337, (hash_policy_traits<PolicyWithoutOptionalOps>::apply(42)));
+}
+
+TEST_F(Test, value) {
+ int b = 0;
+ EXPECT_CALL(value, Call(&a)).WillOnce(ReturnRef(b));
+ EXPECT_EQ(&b, &hash_policy_traits<PolicyWithoutOptionalOps>::value(&a));
+}
+
+TEST_F(Test, without_transfer) {
+ int b = 42;
+ EXPECT_CALL(element, Call(&b)).WillOnce(::testing::ReturnRef(b));
+ EXPECT_CALL(construct, Call(&alloc, &a, b));
+ EXPECT_CALL(destroy, Call(&alloc, &b));
+ hash_policy_traits<PolicyWithoutOptionalOps>::transfer(&alloc, &a, &b);
+}
+
+TEST_F(Test, with_transfer) {
+ int b = 42;
+ EXPECT_CALL(transfer, Call(&alloc, &a, &b));
+ hash_policy_traits<PolicyWithOptionalOps>::transfer(&alloc, &a, &b);
+}
+
+} // namespace
+} // namespace container_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/container/internal/hashtable_debug.h b/third_party/abseil/src/absl/container/internal/hashtable_debug.h
new file mode 100644
index 0000000..19d5212
--- /dev/null
+++ b/third_party/abseil/src/absl/container/internal/hashtable_debug.h
@@ -0,0 +1,110 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// This library provides APIs to debug the probing behavior of hash tables.
+//
+// In general, the probing behavior is a black box for users and only the
+// side effects can be measured in the form of performance differences.
+// These APIs give a glimpse on the actual behavior of the probing algorithms in
+// these hashtables given a specified hash function and a set of elements.
+//
+// The probe count distribution can be used to assess the quality of the hash
+// function for that particular hash table. Note that a hash function that
+// performs well in one hash table implementation does not necessarily performs
+// well in a different one.
+//
+// This library supports std::unordered_{set,map}, dense_hash_{set,map} and
+// absl::{flat,node,string}_hash_{set,map}.
+
+#ifndef ABSL_CONTAINER_INTERNAL_HASHTABLE_DEBUG_H_
+#define ABSL_CONTAINER_INTERNAL_HASHTABLE_DEBUG_H_
+
+#include <cstddef>
+#include <algorithm>
+#include <type_traits>
+#include <vector>
+
+#include "absl/container/internal/hashtable_debug_hooks.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace container_internal {
+
+// Returns the number of probes required to lookup `key`. Returns 0 for a
+// search with no collisions. Higher values mean more hash collisions occurred;
+// however, the exact meaning of this number varies according to the container
+// type.
+template <typename C>
+size_t GetHashtableDebugNumProbes(
+ const C& c, const typename C::key_type& key) {
+ return absl::container_internal::hashtable_debug_internal::
+ HashtableDebugAccess<C>::GetNumProbes(c, key);
+}
+
+// Gets a histogram of the number of probes for each elements in the container.
+// The sum of all the values in the vector is equal to container.size().
+template <typename C>
+std::vector<size_t> GetHashtableDebugNumProbesHistogram(const C& container) {
+ std::vector<size_t> v;
+ for (auto it = container.begin(); it != container.end(); ++it) {
+ size_t num_probes = GetHashtableDebugNumProbes(
+ container,
+ absl::container_internal::hashtable_debug_internal::GetKey<C>(*it, 0));
+ v.resize((std::max)(v.size(), num_probes + 1));
+ v[num_probes]++;
+ }
+ return v;
+}
+
+struct HashtableDebugProbeSummary {
+ size_t total_elements;
+ size_t total_num_probes;
+ double mean;
+};
+
+// Gets a summary of the probe count distribution for the elements in the
+// container.
+template <typename C>
+HashtableDebugProbeSummary GetHashtableDebugProbeSummary(const C& container) {
+ auto probes = GetHashtableDebugNumProbesHistogram(container);
+ HashtableDebugProbeSummary summary = {};
+ for (size_t i = 0; i < probes.size(); ++i) {
+ summary.total_elements += probes[i];
+ summary.total_num_probes += probes[i] * i;
+ }
+ summary.mean = 1.0 * summary.total_num_probes / summary.total_elements;
+ return summary;
+}
+
+// Returns the number of bytes requested from the allocator by the container
+// and not freed.
+template <typename C>
+size_t AllocatedByteSize(const C& c) {
+ return absl::container_internal::hashtable_debug_internal::
+ HashtableDebugAccess<C>::AllocatedByteSize(c);
+}
+
+// Returns a tight lower bound for AllocatedByteSize(c) where `c` is of type `C`
+// and `c.size()` is equal to `num_elements`.
+template <typename C>
+size_t LowerBoundAllocatedByteSize(size_t num_elements) {
+ return absl::container_internal::hashtable_debug_internal::
+ HashtableDebugAccess<C>::LowerBoundAllocatedByteSize(num_elements);
+}
+
+} // namespace container_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_CONTAINER_INTERNAL_HASHTABLE_DEBUG_H_
diff --git a/third_party/abseil/src/absl/container/internal/hashtable_debug_hooks.h b/third_party/abseil/src/absl/container/internal/hashtable_debug_hooks.h
new file mode 100644
index 0000000..3e9ea59
--- /dev/null
+++ b/third_party/abseil/src/absl/container/internal/hashtable_debug_hooks.h
@@ -0,0 +1,85 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// Provides the internal API for hashtable_debug.h.
+
+#ifndef ABSL_CONTAINER_INTERNAL_HASHTABLE_DEBUG_HOOKS_H_
+#define ABSL_CONTAINER_INTERNAL_HASHTABLE_DEBUG_HOOKS_H_
+
+#include <cstddef>
+
+#include <algorithm>
+#include <type_traits>
+#include <vector>
+
+#include "absl/base/config.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace container_internal {
+namespace hashtable_debug_internal {
+
+// If it is a map, call get<0>().
+using std::get;
+template <typename T, typename = typename T::mapped_type>
+auto GetKey(const typename T::value_type& pair, int) -> decltype(get<0>(pair)) {
+ return get<0>(pair);
+}
+
+// If it is not a map, return the value directly.
+template <typename T>
+const typename T::key_type& GetKey(const typename T::key_type& key, char) {
+ return key;
+}
+
+// Containers should specialize this to provide debug information for that
+// container.
+template <class Container, typename Enabler = void>
+struct HashtableDebugAccess {
+ // Returns the number of probes required to find `key` in `c`. The "number of
+ // probes" is a concept that can vary by container. Implementations should
+ // return 0 when `key` was found in the minimum number of operations and
+ // should increment the result for each non-trivial operation required to find
+ // `key`.
+ //
+ // The default implementation uses the bucket api from the standard and thus
+ // works for `std::unordered_*` containers.
+ static size_t GetNumProbes(const Container& c,
+ const typename Container::key_type& key) {
+ if (!c.bucket_count()) return {};
+ size_t num_probes = 0;
+ size_t bucket = c.bucket(key);
+ for (auto it = c.begin(bucket), e = c.end(bucket);; ++it, ++num_probes) {
+ if (it == e) return num_probes;
+ if (c.key_eq()(key, GetKey<Container>(*it, 0))) return num_probes;
+ }
+ }
+
+ // Returns the number of bytes requested from the allocator by the container
+ // and not freed.
+ //
+ // static size_t AllocatedByteSize(const Container& c);
+
+ // Returns a tight lower bound for AllocatedByteSize(c) where `c` is of type
+ // `Container` and `c.size()` is equal to `num_elements`.
+ //
+ // static size_t LowerBoundAllocatedByteSize(size_t num_elements);
+};
+
+} // namespace hashtable_debug_internal
+} // namespace container_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_CONTAINER_INTERNAL_HASHTABLE_DEBUG_HOOKS_H_
diff --git a/third_party/abseil/src/absl/container/internal/hashtablez_sampler.cc b/third_party/abseil/src/absl/container/internal/hashtablez_sampler.cc
new file mode 100644
index 0000000..e4484fb
--- /dev/null
+++ b/third_party/abseil/src/absl/container/internal/hashtablez_sampler.cc
@@ -0,0 +1,270 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/container/internal/hashtablez_sampler.h"
+
+#include <atomic>
+#include <cassert>
+#include <cmath>
+#include <functional>
+#include <limits>
+
+#include "absl/base/attributes.h"
+#include "absl/base/internal/exponential_biased.h"
+#include "absl/container/internal/have_sse.h"
+#include "absl/debugging/stacktrace.h"
+#include "absl/memory/memory.h"
+#include "absl/synchronization/mutex.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace container_internal {
+constexpr int HashtablezInfo::kMaxStackDepth;
+
+namespace {
+ABSL_CONST_INIT std::atomic<bool> g_hashtablez_enabled{
+ false
+};
+ABSL_CONST_INIT std::atomic<int32_t> g_hashtablez_sample_parameter{1 << 10};
+ABSL_CONST_INIT std::atomic<int32_t> g_hashtablez_max_samples{1 << 20};
+
+#if defined(ABSL_INTERNAL_HASHTABLEZ_SAMPLE)
+ABSL_PER_THREAD_TLS_KEYWORD absl::base_internal::ExponentialBiased
+ g_exponential_biased_generator;
+#endif
+
+} // namespace
+
+#if defined(ABSL_INTERNAL_HASHTABLEZ_SAMPLE)
+ABSL_PER_THREAD_TLS_KEYWORD int64_t global_next_sample = 0;
+#endif // defined(ABSL_INTERNAL_HASHTABLEZ_SAMPLE)
+
+HashtablezSampler& HashtablezSampler::Global() {
+ static auto* sampler = new HashtablezSampler();
+ return *sampler;
+}
+
+HashtablezSampler::DisposeCallback HashtablezSampler::SetDisposeCallback(
+ DisposeCallback f) {
+ return dispose_.exchange(f, std::memory_order_relaxed);
+}
+
+HashtablezInfo::HashtablezInfo() { PrepareForSampling(); }
+HashtablezInfo::~HashtablezInfo() = default;
+
+void HashtablezInfo::PrepareForSampling() {
+ capacity.store(0, std::memory_order_relaxed);
+ size.store(0, std::memory_order_relaxed);
+ num_erases.store(0, std::memory_order_relaxed);
+ num_rehashes.store(0, std::memory_order_relaxed);
+ max_probe_length.store(0, std::memory_order_relaxed);
+ total_probe_length.store(0, std::memory_order_relaxed);
+ hashes_bitwise_or.store(0, std::memory_order_relaxed);
+ hashes_bitwise_and.store(~size_t{}, std::memory_order_relaxed);
+
+ create_time = absl::Now();
+ // The inliner makes hardcoded skip_count difficult (especially when combined
+ // with LTO). We use the ability to exclude stacks by regex when encoding
+ // instead.
+ depth = absl::GetStackTrace(stack, HashtablezInfo::kMaxStackDepth,
+ /* skip_count= */ 0);
+ dead = nullptr;
+}
+
+HashtablezSampler::HashtablezSampler()
+ : dropped_samples_(0), size_estimate_(0), all_(nullptr), dispose_(nullptr) {
+ absl::MutexLock l(&graveyard_.init_mu);
+ graveyard_.dead = &graveyard_;
+}
+
+HashtablezSampler::~HashtablezSampler() {
+ HashtablezInfo* s = all_.load(std::memory_order_acquire);
+ while (s != nullptr) {
+ HashtablezInfo* next = s->next;
+ delete s;
+ s = next;
+ }
+}
+
+void HashtablezSampler::PushNew(HashtablezInfo* sample) {
+ sample->next = all_.load(std::memory_order_relaxed);
+ while (!all_.compare_exchange_weak(sample->next, sample,
+ std::memory_order_release,
+ std::memory_order_relaxed)) {
+ }
+}
+
+void HashtablezSampler::PushDead(HashtablezInfo* sample) {
+ if (auto* dispose = dispose_.load(std::memory_order_relaxed)) {
+ dispose(*sample);
+ }
+
+ absl::MutexLock graveyard_lock(&graveyard_.init_mu);
+ absl::MutexLock sample_lock(&sample->init_mu);
+ sample->dead = graveyard_.dead;
+ graveyard_.dead = sample;
+}
+
+HashtablezInfo* HashtablezSampler::PopDead() {
+ absl::MutexLock graveyard_lock(&graveyard_.init_mu);
+
+ // The list is circular, so eventually it collapses down to
+ // graveyard_.dead == &graveyard_
+ // when it is empty.
+ HashtablezInfo* sample = graveyard_.dead;
+ if (sample == &graveyard_) return nullptr;
+
+ absl::MutexLock sample_lock(&sample->init_mu);
+ graveyard_.dead = sample->dead;
+ sample->PrepareForSampling();
+ return sample;
+}
+
+HashtablezInfo* HashtablezSampler::Register() {
+ int64_t size = size_estimate_.fetch_add(1, std::memory_order_relaxed);
+ if (size > g_hashtablez_max_samples.load(std::memory_order_relaxed)) {
+ size_estimate_.fetch_sub(1, std::memory_order_relaxed);
+ dropped_samples_.fetch_add(1, std::memory_order_relaxed);
+ return nullptr;
+ }
+
+ HashtablezInfo* sample = PopDead();
+ if (sample == nullptr) {
+ // Resurrection failed. Hire a new warlock.
+ sample = new HashtablezInfo();
+ PushNew(sample);
+ }
+
+ return sample;
+}
+
+void HashtablezSampler::Unregister(HashtablezInfo* sample) {
+ PushDead(sample);
+ size_estimate_.fetch_sub(1, std::memory_order_relaxed);
+}
+
+int64_t HashtablezSampler::Iterate(
+ const std::function<void(const HashtablezInfo& stack)>& f) {
+ HashtablezInfo* s = all_.load(std::memory_order_acquire);
+ while (s != nullptr) {
+ absl::MutexLock l(&s->init_mu);
+ if (s->dead == nullptr) {
+ f(*s);
+ }
+ s = s->next;
+ }
+
+ return dropped_samples_.load(std::memory_order_relaxed);
+}
+
+static bool ShouldForceSampling() {
+ enum ForceState {
+ kDontForce,
+ kForce,
+ kUninitialized
+ };
+ ABSL_CONST_INIT static std::atomic<ForceState> global_state{
+ kUninitialized};
+ ForceState state = global_state.load(std::memory_order_relaxed);
+ if (ABSL_PREDICT_TRUE(state == kDontForce)) return false;
+
+ if (state == kUninitialized) {
+ state = AbslContainerInternalSampleEverything() ? kForce : kDontForce;
+ global_state.store(state, std::memory_order_relaxed);
+ }
+ return state == kForce;
+}
+
+HashtablezInfo* SampleSlow(int64_t* next_sample) {
+ if (ABSL_PREDICT_FALSE(ShouldForceSampling())) {
+ *next_sample = 1;
+ return HashtablezSampler::Global().Register();
+ }
+
+#if !defined(ABSL_INTERNAL_HASHTABLEZ_SAMPLE)
+ *next_sample = std::numeric_limits<int64_t>::max();
+ return nullptr;
+#else
+ bool first = *next_sample < 0;
+ *next_sample = g_exponential_biased_generator.GetStride(
+ g_hashtablez_sample_parameter.load(std::memory_order_relaxed));
+ // Small values of interval are equivalent to just sampling next time.
+ ABSL_ASSERT(*next_sample >= 1);
+
+ // g_hashtablez_enabled can be dynamically flipped, we need to set a threshold
+ // low enough that we will start sampling in a reasonable time, so we just use
+ // the default sampling rate.
+ if (!g_hashtablez_enabled.load(std::memory_order_relaxed)) return nullptr;
+
+ // We will only be negative on our first count, so we should just retry in
+ // that case.
+ if (first) {
+ if (ABSL_PREDICT_TRUE(--*next_sample > 0)) return nullptr;
+ return SampleSlow(next_sample);
+ }
+
+ return HashtablezSampler::Global().Register();
+#endif
+}
+
+void UnsampleSlow(HashtablezInfo* info) {
+ HashtablezSampler::Global().Unregister(info);
+}
+
+void RecordInsertSlow(HashtablezInfo* info, size_t hash,
+ size_t distance_from_desired) {
+ // SwissTables probe in groups of 16, so scale this to count items probes and
+ // not offset from desired.
+ size_t probe_length = distance_from_desired;
+#if ABSL_INTERNAL_RAW_HASH_SET_HAVE_SSE2
+ probe_length /= 16;
+#else
+ probe_length /= 8;
+#endif
+
+ info->hashes_bitwise_and.fetch_and(hash, std::memory_order_relaxed);
+ info->hashes_bitwise_or.fetch_or(hash, std::memory_order_relaxed);
+ info->max_probe_length.store(
+ std::max(info->max_probe_length.load(std::memory_order_relaxed),
+ probe_length),
+ std::memory_order_relaxed);
+ info->total_probe_length.fetch_add(probe_length, std::memory_order_relaxed);
+ info->size.fetch_add(1, std::memory_order_relaxed);
+}
+
+void SetHashtablezEnabled(bool enabled) {
+ g_hashtablez_enabled.store(enabled, std::memory_order_release);
+}
+
+void SetHashtablezSampleParameter(int32_t rate) {
+ if (rate > 0) {
+ g_hashtablez_sample_parameter.store(rate, std::memory_order_release);
+ } else {
+ ABSL_RAW_LOG(ERROR, "Invalid hashtablez sample rate: %lld",
+ static_cast<long long>(rate)); // NOLINT(runtime/int)
+ }
+}
+
+void SetHashtablezMaxSamples(int32_t max) {
+ if (max > 0) {
+ g_hashtablez_max_samples.store(max, std::memory_order_release);
+ } else {
+ ABSL_RAW_LOG(ERROR, "Invalid hashtablez max samples: %lld",
+ static_cast<long long>(max)); // NOLINT(runtime/int)
+ }
+}
+
+} // namespace container_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/container/internal/hashtablez_sampler.h b/third_party/abseil/src/absl/container/internal/hashtablez_sampler.h
new file mode 100644
index 0000000..394348d
--- /dev/null
+++ b/third_party/abseil/src/absl/container/internal/hashtablez_sampler.h
@@ -0,0 +1,321 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: hashtablez_sampler.h
+// -----------------------------------------------------------------------------
+//
+// This header file defines the API for a low level library to sample hashtables
+// and collect runtime statistics about them.
+//
+// `HashtablezSampler` controls the lifecycle of `HashtablezInfo` objects which
+// store information about a single sample.
+//
+// `Record*` methods store information into samples.
+// `Sample()` and `Unsample()` make use of a single global sampler with
+// properties controlled by the flags hashtablez_enabled,
+// hashtablez_sample_rate, and hashtablez_max_samples.
+//
+// WARNING
+//
+// Using this sampling API may cause sampled Swiss tables to use the global
+// allocator (operator `new`) in addition to any custom allocator. If you
+// are using a table in an unusual circumstance where allocation or calling a
+// linux syscall is unacceptable, this could interfere.
+//
+// This utility is internal-only. Use at your own risk.
+
+#ifndef ABSL_CONTAINER_INTERNAL_HASHTABLEZ_SAMPLER_H_
+#define ABSL_CONTAINER_INTERNAL_HASHTABLEZ_SAMPLER_H_
+
+#include <atomic>
+#include <functional>
+#include <memory>
+#include <vector>
+
+#include "absl/base/internal/per_thread_tls.h"
+#include "absl/base/optimization.h"
+#include "absl/container/internal/have_sse.h"
+#include "absl/synchronization/mutex.h"
+#include "absl/utility/utility.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace container_internal {
+
+// Stores information about a sampled hashtable. All mutations to this *must*
+// be made through `Record*` functions below. All reads from this *must* only
+// occur in the callback to `HashtablezSampler::Iterate`.
+struct HashtablezInfo {
+ // Constructs the object but does not fill in any fields.
+ HashtablezInfo();
+ ~HashtablezInfo();
+ HashtablezInfo(const HashtablezInfo&) = delete;
+ HashtablezInfo& operator=(const HashtablezInfo&) = delete;
+
+ // Puts the object into a clean state, fills in the logically `const` members,
+ // blocking for any readers that are currently sampling the object.
+ void PrepareForSampling() ABSL_EXCLUSIVE_LOCKS_REQUIRED(init_mu);
+
+ // These fields are mutated by the various Record* APIs and need to be
+ // thread-safe.
+ std::atomic<size_t> capacity;
+ std::atomic<size_t> size;
+ std::atomic<size_t> num_erases;
+ std::atomic<size_t> num_rehashes;
+ std::atomic<size_t> max_probe_length;
+ std::atomic<size_t> total_probe_length;
+ std::atomic<size_t> hashes_bitwise_or;
+ std::atomic<size_t> hashes_bitwise_and;
+
+ // `HashtablezSampler` maintains intrusive linked lists for all samples. See
+ // comments on `HashtablezSampler::all_` for details on these. `init_mu`
+ // guards the ability to restore the sample to a pristine state. This
+ // prevents races with sampling and resurrecting an object.
+ absl::Mutex init_mu;
+ HashtablezInfo* next;
+ HashtablezInfo* dead ABSL_GUARDED_BY(init_mu);
+
+ // All of the fields below are set by `PrepareForSampling`, they must not be
+ // mutated in `Record*` functions. They are logically `const` in that sense.
+ // These are guarded by init_mu, but that is not externalized to clients, who
+ // can only read them during `HashtablezSampler::Iterate` which will hold the
+ // lock.
+ static constexpr int kMaxStackDepth = 64;
+ absl::Time create_time;
+ int32_t depth;
+ void* stack[kMaxStackDepth];
+};
+
+inline void RecordRehashSlow(HashtablezInfo* info, size_t total_probe_length) {
+#if ABSL_INTERNAL_RAW_HASH_SET_HAVE_SSE2
+ total_probe_length /= 16;
+#else
+ total_probe_length /= 8;
+#endif
+ info->total_probe_length.store(total_probe_length, std::memory_order_relaxed);
+ info->num_erases.store(0, std::memory_order_relaxed);
+ // There is only one concurrent writer, so `load` then `store` is sufficient
+ // instead of using `fetch_add`.
+ info->num_rehashes.store(
+ 1 + info->num_rehashes.load(std::memory_order_relaxed),
+ std::memory_order_relaxed);
+}
+
+inline void RecordStorageChangedSlow(HashtablezInfo* info, size_t size,
+ size_t capacity) {
+ info->size.store(size, std::memory_order_relaxed);
+ info->capacity.store(capacity, std::memory_order_relaxed);
+ if (size == 0) {
+ // This is a clear, reset the total/num_erases too.
+ info->total_probe_length.store(0, std::memory_order_relaxed);
+ info->num_erases.store(0, std::memory_order_relaxed);
+ }
+}
+
+void RecordInsertSlow(HashtablezInfo* info, size_t hash,
+ size_t distance_from_desired);
+
+inline void RecordEraseSlow(HashtablezInfo* info) {
+ info->size.fetch_sub(1, std::memory_order_relaxed);
+ // There is only one concurrent writer, so `load` then `store` is sufficient
+ // instead of using `fetch_add`.
+ info->num_erases.store(
+ 1 + info->num_erases.load(std::memory_order_relaxed),
+ std::memory_order_relaxed);
+}
+
+HashtablezInfo* SampleSlow(int64_t* next_sample);
+void UnsampleSlow(HashtablezInfo* info);
+
+#if defined(ABSL_INTERNAL_HASHTABLEZ_SAMPLE)
+#error ABSL_INTERNAL_HASHTABLEZ_SAMPLE cannot be directly set
+#endif // defined(ABSL_INTERNAL_HASHTABLEZ_SAMPLE)
+
+#if defined(ABSL_INTERNAL_HASHTABLEZ_SAMPLE)
+class HashtablezInfoHandle {
+ public:
+ explicit HashtablezInfoHandle() : info_(nullptr) {}
+ explicit HashtablezInfoHandle(HashtablezInfo* info) : info_(info) {}
+ ~HashtablezInfoHandle() {
+ if (ABSL_PREDICT_TRUE(info_ == nullptr)) return;
+ UnsampleSlow(info_);
+ }
+
+ HashtablezInfoHandle(const HashtablezInfoHandle&) = delete;
+ HashtablezInfoHandle& operator=(const HashtablezInfoHandle&) = delete;
+
+ HashtablezInfoHandle(HashtablezInfoHandle&& o) noexcept
+ : info_(absl::exchange(o.info_, nullptr)) {}
+ HashtablezInfoHandle& operator=(HashtablezInfoHandle&& o) noexcept {
+ if (ABSL_PREDICT_FALSE(info_ != nullptr)) {
+ UnsampleSlow(info_);
+ }
+ info_ = absl::exchange(o.info_, nullptr);
+ return *this;
+ }
+
+ inline void RecordStorageChanged(size_t size, size_t capacity) {
+ if (ABSL_PREDICT_TRUE(info_ == nullptr)) return;
+ RecordStorageChangedSlow(info_, size, capacity);
+ }
+
+ inline void RecordRehash(size_t total_probe_length) {
+ if (ABSL_PREDICT_TRUE(info_ == nullptr)) return;
+ RecordRehashSlow(info_, total_probe_length);
+ }
+
+ inline void RecordInsert(size_t hash, size_t distance_from_desired) {
+ if (ABSL_PREDICT_TRUE(info_ == nullptr)) return;
+ RecordInsertSlow(info_, hash, distance_from_desired);
+ }
+
+ inline void RecordErase() {
+ if (ABSL_PREDICT_TRUE(info_ == nullptr)) return;
+ RecordEraseSlow(info_);
+ }
+
+ friend inline void swap(HashtablezInfoHandle& lhs,
+ HashtablezInfoHandle& rhs) {
+ std::swap(lhs.info_, rhs.info_);
+ }
+
+ private:
+ friend class HashtablezInfoHandlePeer;
+ HashtablezInfo* info_;
+};
+#else
+// Ensure that when Hashtablez is turned off at compile time, HashtablezInfo can
+// be removed by the linker, in order to reduce the binary size.
+class HashtablezInfoHandle {
+ public:
+ explicit HashtablezInfoHandle() = default;
+ explicit HashtablezInfoHandle(std::nullptr_t) {}
+
+ inline void RecordStorageChanged(size_t /*size*/, size_t /*capacity*/) {}
+ inline void RecordRehash(size_t /*total_probe_length*/) {}
+ inline void RecordInsert(size_t /*hash*/, size_t /*distance_from_desired*/) {}
+ inline void RecordErase() {}
+
+ friend inline void swap(HashtablezInfoHandle& /*lhs*/,
+ HashtablezInfoHandle& /*rhs*/) {}
+};
+#endif // defined(ABSL_INTERNAL_HASHTABLEZ_SAMPLE)
+
+#if defined(ABSL_INTERNAL_HASHTABLEZ_SAMPLE)
+extern ABSL_PER_THREAD_TLS_KEYWORD int64_t global_next_sample;
+#endif // defined(ABSL_INTERNAL_HASHTABLEZ_SAMPLE)
+
+// Returns an RAII sampling handle that manages registration and unregistation
+// with the global sampler.
+inline HashtablezInfoHandle Sample() {
+#if defined(ABSL_INTERNAL_HASHTABLEZ_SAMPLE)
+ if (ABSL_PREDICT_TRUE(--global_next_sample > 0)) {
+ return HashtablezInfoHandle(nullptr);
+ }
+ return HashtablezInfoHandle(SampleSlow(&global_next_sample));
+#else
+ return HashtablezInfoHandle(nullptr);
+#endif // !ABSL_PER_THREAD_TLS
+}
+
+// Holds samples and their associated stack traces with a soft limit of
+// `SetHashtablezMaxSamples()`.
+//
+// Thread safe.
+class HashtablezSampler {
+ public:
+ // Returns a global Sampler.
+ static HashtablezSampler& Global();
+
+ HashtablezSampler();
+ ~HashtablezSampler();
+
+ // Registers for sampling. Returns an opaque registration info.
+ HashtablezInfo* Register();
+
+ // Unregisters the sample.
+ void Unregister(HashtablezInfo* sample);
+
+ // The dispose callback will be called on all samples the moment they are
+ // being unregistered. Only affects samples that are unregistered after the
+ // callback has been set.
+ // Returns the previous callback.
+ using DisposeCallback = void (*)(const HashtablezInfo&);
+ DisposeCallback SetDisposeCallback(DisposeCallback f);
+
+ // Iterates over all the registered `StackInfo`s. Returning the number of
+ // samples that have been dropped.
+ int64_t Iterate(const std::function<void(const HashtablezInfo& stack)>& f);
+
+ private:
+ void PushNew(HashtablezInfo* sample);
+ void PushDead(HashtablezInfo* sample);
+ HashtablezInfo* PopDead();
+
+ std::atomic<size_t> dropped_samples_;
+ std::atomic<size_t> size_estimate_;
+
+ // Intrusive lock free linked lists for tracking samples.
+ //
+ // `all_` records all samples (they are never removed from this list) and is
+ // terminated with a `nullptr`.
+ //
+ // `graveyard_.dead` is a circular linked list. When it is empty,
+ // `graveyard_.dead == &graveyard`. The list is circular so that
+ // every item on it (even the last) has a non-null dead pointer. This allows
+ // `Iterate` to determine if a given sample is live or dead using only
+ // information on the sample itself.
+ //
+ // For example, nodes [A, B, C, D, E] with [A, C, E] alive and [B, D] dead
+ // looks like this (G is the Graveyard):
+ //
+ // +---+ +---+ +---+ +---+ +---+
+ // all -->| A |--->| B |--->| C |--->| D |--->| E |
+ // | | | | | | | | | |
+ // +---+ | | +->| |-+ | | +->| |-+ | |
+ // | G | +---+ | +---+ | +---+ | +---+ | +---+
+ // | | | | | |
+ // | | --------+ +--------+ |
+ // +---+ |
+ // ^ |
+ // +--------------------------------------+
+ //
+ std::atomic<HashtablezInfo*> all_;
+ HashtablezInfo graveyard_;
+
+ std::atomic<DisposeCallback> dispose_;
+};
+
+// Enables or disables sampling for Swiss tables.
+void SetHashtablezEnabled(bool enabled);
+
+// Sets the rate at which Swiss tables will be sampled.
+void SetHashtablezSampleParameter(int32_t rate);
+
+// Sets a soft max for the number of samples that will be kept.
+void SetHashtablezMaxSamples(int32_t max);
+
+// Configuration override.
+// This allows process-wide sampling without depending on order of
+// initialization of static storage duration objects.
+// The definition of this constant is weak, which allows us to inject a
+// different value for it at link time.
+extern "C" bool AbslContainerInternalSampleEverything();
+
+} // namespace container_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_CONTAINER_INTERNAL_HASHTABLEZ_SAMPLER_H_
diff --git a/third_party/abseil/src/absl/container/internal/hashtablez_sampler_force_weak_definition.cc b/third_party/abseil/src/absl/container/internal/hashtablez_sampler_force_weak_definition.cc
new file mode 100644
index 0000000..78b9d36
--- /dev/null
+++ b/third_party/abseil/src/absl/container/internal/hashtablez_sampler_force_weak_definition.cc
@@ -0,0 +1,30 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/container/internal/hashtablez_sampler.h"
+
+#include "absl/base/attributes.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace container_internal {
+
+// See hashtablez_sampler.h for details.
+extern "C" ABSL_ATTRIBUTE_WEAK bool AbslContainerInternalSampleEverything() {
+ return false;
+}
+
+} // namespace container_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/container/internal/hashtablez_sampler_test.cc b/third_party/abseil/src/absl/container/internal/hashtablez_sampler_test.cc
new file mode 100644
index 0000000..8d10a1e
--- /dev/null
+++ b/third_party/abseil/src/absl/container/internal/hashtablez_sampler_test.cc
@@ -0,0 +1,371 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/container/internal/hashtablez_sampler.h"
+
+#include <atomic>
+#include <limits>
+#include <random>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/base/attributes.h"
+#include "absl/container/internal/have_sse.h"
+#include "absl/synchronization/blocking_counter.h"
+#include "absl/synchronization/internal/thread_pool.h"
+#include "absl/synchronization/mutex.h"
+#include "absl/synchronization/notification.h"
+#include "absl/time/clock.h"
+#include "absl/time/time.h"
+
+#if ABSL_INTERNAL_RAW_HASH_SET_HAVE_SSE2
+constexpr int kProbeLength = 16;
+#else
+constexpr int kProbeLength = 8;
+#endif
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace container_internal {
+#if defined(ABSL_INTERNAL_HASHTABLEZ_SAMPLE)
+class HashtablezInfoHandlePeer {
+ public:
+ static bool IsSampled(const HashtablezInfoHandle& h) {
+ return h.info_ != nullptr;
+ }
+
+ static HashtablezInfo* GetInfo(HashtablezInfoHandle* h) { return h->info_; }
+};
+#else
+class HashtablezInfoHandlePeer {
+ public:
+ static bool IsSampled(const HashtablezInfoHandle&) { return false; }
+ static HashtablezInfo* GetInfo(HashtablezInfoHandle*) { return nullptr; }
+};
+#endif // defined(ABSL_INTERNAL_HASHTABLEZ_SAMPLE)
+
+namespace {
+using ::absl::synchronization_internal::ThreadPool;
+using ::testing::IsEmpty;
+using ::testing::UnorderedElementsAre;
+
+std::vector<size_t> GetSizes(HashtablezSampler* s) {
+ std::vector<size_t> res;
+ s->Iterate([&](const HashtablezInfo& info) {
+ res.push_back(info.size.load(std::memory_order_acquire));
+ });
+ return res;
+}
+
+HashtablezInfo* Register(HashtablezSampler* s, size_t size) {
+ auto* info = s->Register();
+ assert(info != nullptr);
+ info->size.store(size);
+ return info;
+}
+
+TEST(HashtablezInfoTest, PrepareForSampling) {
+ absl::Time test_start = absl::Now();
+ HashtablezInfo info;
+ absl::MutexLock l(&info.init_mu);
+ info.PrepareForSampling();
+
+ EXPECT_EQ(info.capacity.load(), 0);
+ EXPECT_EQ(info.size.load(), 0);
+ EXPECT_EQ(info.num_erases.load(), 0);
+ EXPECT_EQ(info.num_rehashes.load(), 0);
+ EXPECT_EQ(info.max_probe_length.load(), 0);
+ EXPECT_EQ(info.total_probe_length.load(), 0);
+ EXPECT_EQ(info.hashes_bitwise_or.load(), 0);
+ EXPECT_EQ(info.hashes_bitwise_and.load(), ~size_t{});
+ EXPECT_GE(info.create_time, test_start);
+
+ info.capacity.store(1, std::memory_order_relaxed);
+ info.size.store(1, std::memory_order_relaxed);
+ info.num_erases.store(1, std::memory_order_relaxed);
+ info.max_probe_length.store(1, std::memory_order_relaxed);
+ info.total_probe_length.store(1, std::memory_order_relaxed);
+ info.hashes_bitwise_or.store(1, std::memory_order_relaxed);
+ info.hashes_bitwise_and.store(1, std::memory_order_relaxed);
+ info.create_time = test_start - absl::Hours(20);
+
+ info.PrepareForSampling();
+ EXPECT_EQ(info.capacity.load(), 0);
+ EXPECT_EQ(info.size.load(), 0);
+ EXPECT_EQ(info.num_erases.load(), 0);
+ EXPECT_EQ(info.num_rehashes.load(), 0);
+ EXPECT_EQ(info.max_probe_length.load(), 0);
+ EXPECT_EQ(info.total_probe_length.load(), 0);
+ EXPECT_EQ(info.hashes_bitwise_or.load(), 0);
+ EXPECT_EQ(info.hashes_bitwise_and.load(), ~size_t{});
+ EXPECT_GE(info.create_time, test_start);
+}
+
+TEST(HashtablezInfoTest, RecordStorageChanged) {
+ HashtablezInfo info;
+ absl::MutexLock l(&info.init_mu);
+ info.PrepareForSampling();
+ RecordStorageChangedSlow(&info, 17, 47);
+ EXPECT_EQ(info.size.load(), 17);
+ EXPECT_EQ(info.capacity.load(), 47);
+ RecordStorageChangedSlow(&info, 20, 20);
+ EXPECT_EQ(info.size.load(), 20);
+ EXPECT_EQ(info.capacity.load(), 20);
+}
+
+TEST(HashtablezInfoTest, RecordInsert) {
+ HashtablezInfo info;
+ absl::MutexLock l(&info.init_mu);
+ info.PrepareForSampling();
+ EXPECT_EQ(info.max_probe_length.load(), 0);
+ RecordInsertSlow(&info, 0x0000FF00, 6 * kProbeLength);
+ EXPECT_EQ(info.max_probe_length.load(), 6);
+ EXPECT_EQ(info.hashes_bitwise_and.load(), 0x0000FF00);
+ EXPECT_EQ(info.hashes_bitwise_or.load(), 0x0000FF00);
+ RecordInsertSlow(&info, 0x000FF000, 4 * kProbeLength);
+ EXPECT_EQ(info.max_probe_length.load(), 6);
+ EXPECT_EQ(info.hashes_bitwise_and.load(), 0x0000F000);
+ EXPECT_EQ(info.hashes_bitwise_or.load(), 0x000FFF00);
+ RecordInsertSlow(&info, 0x00FF0000, 12 * kProbeLength);
+ EXPECT_EQ(info.max_probe_length.load(), 12);
+ EXPECT_EQ(info.hashes_bitwise_and.load(), 0x00000000);
+ EXPECT_EQ(info.hashes_bitwise_or.load(), 0x00FFFF00);
+}
+
+TEST(HashtablezInfoTest, RecordErase) {
+ HashtablezInfo info;
+ absl::MutexLock l(&info.init_mu);
+ info.PrepareForSampling();
+ EXPECT_EQ(info.num_erases.load(), 0);
+ EXPECT_EQ(info.size.load(), 0);
+ RecordInsertSlow(&info, 0x0000FF00, 6 * kProbeLength);
+ EXPECT_EQ(info.size.load(), 1);
+ RecordEraseSlow(&info);
+ EXPECT_EQ(info.size.load(), 0);
+ EXPECT_EQ(info.num_erases.load(), 1);
+}
+
+TEST(HashtablezInfoTest, RecordRehash) {
+ HashtablezInfo info;
+ absl::MutexLock l(&info.init_mu);
+ info.PrepareForSampling();
+ RecordInsertSlow(&info, 0x1, 0);
+ RecordInsertSlow(&info, 0x2, kProbeLength);
+ RecordInsertSlow(&info, 0x4, kProbeLength);
+ RecordInsertSlow(&info, 0x8, 2 * kProbeLength);
+ EXPECT_EQ(info.size.load(), 4);
+ EXPECT_EQ(info.total_probe_length.load(), 4);
+
+ RecordEraseSlow(&info);
+ RecordEraseSlow(&info);
+ EXPECT_EQ(info.size.load(), 2);
+ EXPECT_EQ(info.total_probe_length.load(), 4);
+ EXPECT_EQ(info.num_erases.load(), 2);
+
+ RecordRehashSlow(&info, 3 * kProbeLength);
+ EXPECT_EQ(info.size.load(), 2);
+ EXPECT_EQ(info.total_probe_length.load(), 3);
+ EXPECT_EQ(info.num_erases.load(), 0);
+ EXPECT_EQ(info.num_rehashes.load(), 1);
+}
+
+#if defined(ABSL_INTERNAL_HASHTABLEZ_SAMPLE)
+TEST(HashtablezSamplerTest, SmallSampleParameter) {
+ SetHashtablezEnabled(true);
+ SetHashtablezSampleParameter(100);
+
+ for (int i = 0; i < 1000; ++i) {
+ int64_t next_sample = 0;
+ HashtablezInfo* sample = SampleSlow(&next_sample);
+ EXPECT_GT(next_sample, 0);
+ EXPECT_NE(sample, nullptr);
+ UnsampleSlow(sample);
+ }
+}
+
+TEST(HashtablezSamplerTest, LargeSampleParameter) {
+ SetHashtablezEnabled(true);
+ SetHashtablezSampleParameter(std::numeric_limits<int32_t>::max());
+
+ for (int i = 0; i < 1000; ++i) {
+ int64_t next_sample = 0;
+ HashtablezInfo* sample = SampleSlow(&next_sample);
+ EXPECT_GT(next_sample, 0);
+ EXPECT_NE(sample, nullptr);
+ UnsampleSlow(sample);
+ }
+}
+
+TEST(HashtablezSamplerTest, Sample) {
+ SetHashtablezEnabled(true);
+ SetHashtablezSampleParameter(100);
+ int64_t num_sampled = 0;
+ int64_t total = 0;
+ double sample_rate = 0.0;
+ for (int i = 0; i < 1000000; ++i) {
+ HashtablezInfoHandle h = Sample();
+ ++total;
+ if (HashtablezInfoHandlePeer::IsSampled(h)) {
+ ++num_sampled;
+ }
+ sample_rate = static_cast<double>(num_sampled) / total;
+ if (0.005 < sample_rate && sample_rate < 0.015) break;
+ }
+ EXPECT_NEAR(sample_rate, 0.01, 0.005);
+}
+
+TEST(HashtablezSamplerTest, Handle) {
+ auto& sampler = HashtablezSampler::Global();
+ HashtablezInfoHandle h(sampler.Register());
+ auto* info = HashtablezInfoHandlePeer::GetInfo(&h);
+ info->hashes_bitwise_and.store(0x12345678, std::memory_order_relaxed);
+
+ bool found = false;
+ sampler.Iterate([&](const HashtablezInfo& h) {
+ if (&h == info) {
+ EXPECT_EQ(h.hashes_bitwise_and.load(), 0x12345678);
+ found = true;
+ }
+ });
+ EXPECT_TRUE(found);
+
+ h = HashtablezInfoHandle();
+ found = false;
+ sampler.Iterate([&](const HashtablezInfo& h) {
+ if (&h == info) {
+ // this will only happen if some other thread has resurrected the info
+ // the old handle was using.
+ if (h.hashes_bitwise_and.load() == 0x12345678) {
+ found = true;
+ }
+ }
+ });
+ EXPECT_FALSE(found);
+}
+#endif
+
+
+TEST(HashtablezSamplerTest, Registration) {
+ HashtablezSampler sampler;
+ auto* info1 = Register(&sampler, 1);
+ EXPECT_THAT(GetSizes(&sampler), UnorderedElementsAre(1));
+
+ auto* info2 = Register(&sampler, 2);
+ EXPECT_THAT(GetSizes(&sampler), UnorderedElementsAre(1, 2));
+ info1->size.store(3);
+ EXPECT_THAT(GetSizes(&sampler), UnorderedElementsAre(3, 2));
+
+ sampler.Unregister(info1);
+ sampler.Unregister(info2);
+}
+
+TEST(HashtablezSamplerTest, Unregistration) {
+ HashtablezSampler sampler;
+ std::vector<HashtablezInfo*> infos;
+ for (size_t i = 0; i < 3; ++i) {
+ infos.push_back(Register(&sampler, i));
+ }
+ EXPECT_THAT(GetSizes(&sampler), UnorderedElementsAre(0, 1, 2));
+
+ sampler.Unregister(infos[1]);
+ EXPECT_THAT(GetSizes(&sampler), UnorderedElementsAre(0, 2));
+
+ infos.push_back(Register(&sampler, 3));
+ infos.push_back(Register(&sampler, 4));
+ EXPECT_THAT(GetSizes(&sampler), UnorderedElementsAre(0, 2, 3, 4));
+ sampler.Unregister(infos[3]);
+ EXPECT_THAT(GetSizes(&sampler), UnorderedElementsAre(0, 2, 4));
+
+ sampler.Unregister(infos[0]);
+ sampler.Unregister(infos[2]);
+ sampler.Unregister(infos[4]);
+ EXPECT_THAT(GetSizes(&sampler), IsEmpty());
+}
+
+TEST(HashtablezSamplerTest, MultiThreaded) {
+ HashtablezSampler sampler;
+ Notification stop;
+ ThreadPool pool(10);
+
+ for (int i = 0; i < 10; ++i) {
+ pool.Schedule([&sampler, &stop]() {
+ std::random_device rd;
+ std::mt19937 gen(rd());
+
+ std::vector<HashtablezInfo*> infoz;
+ while (!stop.HasBeenNotified()) {
+ if (infoz.empty()) {
+ infoz.push_back(sampler.Register());
+ }
+ switch (std::uniform_int_distribution<>(0, 2)(gen)) {
+ case 0: {
+ infoz.push_back(sampler.Register());
+ break;
+ }
+ case 1: {
+ size_t p =
+ std::uniform_int_distribution<>(0, infoz.size() - 1)(gen);
+ HashtablezInfo* info = infoz[p];
+ infoz[p] = infoz.back();
+ infoz.pop_back();
+ sampler.Unregister(info);
+ break;
+ }
+ case 2: {
+ absl::Duration oldest = absl::ZeroDuration();
+ sampler.Iterate([&](const HashtablezInfo& info) {
+ oldest = std::max(oldest, absl::Now() - info.create_time);
+ });
+ ASSERT_GE(oldest, absl::ZeroDuration());
+ break;
+ }
+ }
+ }
+ });
+ }
+ // The threads will hammer away. Give it a little bit of time for tsan to
+ // spot errors.
+ absl::SleepFor(absl::Seconds(3));
+ stop.Notify();
+}
+
+TEST(HashtablezSamplerTest, Callback) {
+ HashtablezSampler sampler;
+
+ auto* info1 = Register(&sampler, 1);
+ auto* info2 = Register(&sampler, 2);
+
+ static const HashtablezInfo* expected;
+
+ auto callback = [](const HashtablezInfo& info) {
+ // We can't use `info` outside of this callback because the object will be
+ // disposed as soon as we return from here.
+ EXPECT_EQ(&info, expected);
+ };
+
+ // Set the callback.
+ EXPECT_EQ(sampler.SetDisposeCallback(callback), nullptr);
+ expected = info1;
+ sampler.Unregister(info1);
+
+ // Unset the callback.
+ EXPECT_EQ(callback, sampler.SetDisposeCallback(nullptr));
+ expected = nullptr; // no more calls.
+ sampler.Unregister(info2);
+}
+
+} // namespace
+} // namespace container_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/container/internal/have_sse.h b/third_party/abseil/src/absl/container/internal/have_sse.h
new file mode 100644
index 0000000..e75e1a1
--- /dev/null
+++ b/third_party/abseil/src/absl/container/internal/have_sse.h
@@ -0,0 +1,50 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// Shared config probing for SSE instructions used in Swiss tables.
+#ifndef ABSL_CONTAINER_INTERNAL_HAVE_SSE_H_
+#define ABSL_CONTAINER_INTERNAL_HAVE_SSE_H_
+
+#ifndef ABSL_INTERNAL_RAW_HASH_SET_HAVE_SSE2
+#if defined(__SSE2__) || \
+ (defined(_MSC_VER) && \
+ (defined(_M_X64) || (defined(_M_IX86) && _M_IX86_FP >= 2)))
+#define ABSL_INTERNAL_RAW_HASH_SET_HAVE_SSE2 1
+#else
+#define ABSL_INTERNAL_RAW_HASH_SET_HAVE_SSE2 0
+#endif
+#endif
+
+#ifndef ABSL_INTERNAL_RAW_HASH_SET_HAVE_SSSE3
+#ifdef __SSSE3__
+#define ABSL_INTERNAL_RAW_HASH_SET_HAVE_SSSE3 1
+#else
+#define ABSL_INTERNAL_RAW_HASH_SET_HAVE_SSSE3 0
+#endif
+#endif
+
+#if ABSL_INTERNAL_RAW_HASH_SET_HAVE_SSSE3 && \
+ !ABSL_INTERNAL_RAW_HASH_SET_HAVE_SSE2
+#error "Bad configuration!"
+#endif
+
+#if ABSL_INTERNAL_RAW_HASH_SET_HAVE_SSE2
+#include <emmintrin.h>
+#endif
+
+#if ABSL_INTERNAL_RAW_HASH_SET_HAVE_SSSE3
+#include <tmmintrin.h>
+#endif
+
+#endif // ABSL_CONTAINER_INTERNAL_HAVE_SSE_H_
diff --git a/third_party/abseil/src/absl/container/internal/inlined_vector.h b/third_party/abseil/src/absl/container/internal/inlined_vector.h
new file mode 100644
index 0000000..c98c25c
--- /dev/null
+++ b/third_party/abseil/src/absl/container/internal/inlined_vector.h
@@ -0,0 +1,895 @@
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_CONTAINER_INTERNAL_INLINED_VECTOR_INTERNAL_H_
+#define ABSL_CONTAINER_INTERNAL_INLINED_VECTOR_INTERNAL_H_
+
+#include <algorithm>
+#include <cstddef>
+#include <cstring>
+#include <iterator>
+#include <limits>
+#include <memory>
+#include <utility>
+
+#include "absl/base/macros.h"
+#include "absl/container/internal/compressed_tuple.h"
+#include "absl/memory/memory.h"
+#include "absl/meta/type_traits.h"
+#include "absl/types/span.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace inlined_vector_internal {
+
+template <typename Iterator>
+using IsAtLeastForwardIterator = std::is_convertible<
+ typename std::iterator_traits<Iterator>::iterator_category,
+ std::forward_iterator_tag>;
+
+template <typename AllocatorType,
+ typename ValueType =
+ typename absl::allocator_traits<AllocatorType>::value_type>
+using IsMemcpyOk =
+ absl::conjunction<std::is_same<AllocatorType, std::allocator<ValueType>>,
+ absl::is_trivially_copy_constructible<ValueType>,
+ absl::is_trivially_copy_assignable<ValueType>,
+ absl::is_trivially_destructible<ValueType>>;
+
+template <typename AllocatorType, typename Pointer, typename SizeType>
+void DestroyElements(AllocatorType* alloc_ptr, Pointer destroy_first,
+ SizeType destroy_size) {
+ using AllocatorTraits = absl::allocator_traits<AllocatorType>;
+
+ if (destroy_first != nullptr) {
+ for (auto i = destroy_size; i != 0;) {
+ --i;
+ AllocatorTraits::destroy(*alloc_ptr, destroy_first + i);
+ }
+
+#if !defined(NDEBUG)
+ {
+ using ValueType = typename AllocatorTraits::value_type;
+
+ // Overwrite unused memory with `0xab` so we can catch uninitialized
+ // usage.
+ //
+ // Cast to `void*` to tell the compiler that we don't care that we might
+ // be scribbling on a vtable pointer.
+ void* memory_ptr = destroy_first;
+ auto memory_size = destroy_size * sizeof(ValueType);
+ std::memset(memory_ptr, 0xab, memory_size);
+ }
+#endif // !defined(NDEBUG)
+ }
+}
+
+template <typename AllocatorType, typename Pointer, typename ValueAdapter,
+ typename SizeType>
+void ConstructElements(AllocatorType* alloc_ptr, Pointer construct_first,
+ ValueAdapter* values_ptr, SizeType construct_size) {
+ for (SizeType i = 0; i < construct_size; ++i) {
+ ABSL_INTERNAL_TRY {
+ values_ptr->ConstructNext(alloc_ptr, construct_first + i);
+ }
+ ABSL_INTERNAL_CATCH_ANY {
+ inlined_vector_internal::DestroyElements(alloc_ptr, construct_first, i);
+ ABSL_INTERNAL_RETHROW;
+ }
+ }
+}
+
+template <typename Pointer, typename ValueAdapter, typename SizeType>
+void AssignElements(Pointer assign_first, ValueAdapter* values_ptr,
+ SizeType assign_size) {
+ for (SizeType i = 0; i < assign_size; ++i) {
+ values_ptr->AssignNext(assign_first + i);
+ }
+}
+
+template <typename AllocatorType>
+struct StorageView {
+ using AllocatorTraits = absl::allocator_traits<AllocatorType>;
+ using Pointer = typename AllocatorTraits::pointer;
+ using SizeType = typename AllocatorTraits::size_type;
+
+ Pointer data;
+ SizeType size;
+ SizeType capacity;
+};
+
+template <typename AllocatorType, typename Iterator>
+class IteratorValueAdapter {
+ using AllocatorTraits = absl::allocator_traits<AllocatorType>;
+ using Pointer = typename AllocatorTraits::pointer;
+
+ public:
+ explicit IteratorValueAdapter(const Iterator& it) : it_(it) {}
+
+ void ConstructNext(AllocatorType* alloc_ptr, Pointer construct_at) {
+ AllocatorTraits::construct(*alloc_ptr, construct_at, *it_);
+ ++it_;
+ }
+
+ void AssignNext(Pointer assign_at) {
+ *assign_at = *it_;
+ ++it_;
+ }
+
+ private:
+ Iterator it_;
+};
+
+template <typename AllocatorType>
+class CopyValueAdapter {
+ using AllocatorTraits = absl::allocator_traits<AllocatorType>;
+ using ValueType = typename AllocatorTraits::value_type;
+ using Pointer = typename AllocatorTraits::pointer;
+ using ConstPointer = typename AllocatorTraits::const_pointer;
+
+ public:
+ explicit CopyValueAdapter(const ValueType& v) : ptr_(std::addressof(v)) {}
+
+ void ConstructNext(AllocatorType* alloc_ptr, Pointer construct_at) {
+ AllocatorTraits::construct(*alloc_ptr, construct_at, *ptr_);
+ }
+
+ void AssignNext(Pointer assign_at) { *assign_at = *ptr_; }
+
+ private:
+ ConstPointer ptr_;
+};
+
+template <typename AllocatorType>
+class DefaultValueAdapter {
+ using AllocatorTraits = absl::allocator_traits<AllocatorType>;
+ using ValueType = typename AllocatorTraits::value_type;
+ using Pointer = typename AllocatorTraits::pointer;
+
+ public:
+ explicit DefaultValueAdapter() {}
+
+ void ConstructNext(AllocatorType* alloc_ptr, Pointer construct_at) {
+ AllocatorTraits::construct(*alloc_ptr, construct_at);
+ }
+
+ void AssignNext(Pointer assign_at) { *assign_at = ValueType(); }
+};
+
+template <typename AllocatorType>
+class AllocationTransaction {
+ using AllocatorTraits = absl::allocator_traits<AllocatorType>;
+ using Pointer = typename AllocatorTraits::pointer;
+ using SizeType = typename AllocatorTraits::size_type;
+
+ public:
+ explicit AllocationTransaction(AllocatorType* alloc_ptr)
+ : alloc_data_(*alloc_ptr, nullptr) {}
+
+ ~AllocationTransaction() {
+ if (DidAllocate()) {
+ AllocatorTraits::deallocate(GetAllocator(), GetData(), GetCapacity());
+ }
+ }
+
+ AllocationTransaction(const AllocationTransaction&) = delete;
+ void operator=(const AllocationTransaction&) = delete;
+
+ AllocatorType& GetAllocator() { return alloc_data_.template get<0>(); }
+ Pointer& GetData() { return alloc_data_.template get<1>(); }
+ SizeType& GetCapacity() { return capacity_; }
+
+ bool DidAllocate() { return GetData() != nullptr; }
+ Pointer Allocate(SizeType capacity) {
+ GetData() = AllocatorTraits::allocate(GetAllocator(), capacity);
+ GetCapacity() = capacity;
+ return GetData();
+ }
+
+ void Reset() {
+ GetData() = nullptr;
+ GetCapacity() = 0;
+ }
+
+ private:
+ container_internal::CompressedTuple<AllocatorType, Pointer> alloc_data_;
+ SizeType capacity_ = 0;
+};
+
+template <typename AllocatorType>
+class ConstructionTransaction {
+ using AllocatorTraits = absl::allocator_traits<AllocatorType>;
+ using Pointer = typename AllocatorTraits::pointer;
+ using SizeType = typename AllocatorTraits::size_type;
+
+ public:
+ explicit ConstructionTransaction(AllocatorType* alloc_ptr)
+ : alloc_data_(*alloc_ptr, nullptr) {}
+
+ ~ConstructionTransaction() {
+ if (DidConstruct()) {
+ inlined_vector_internal::DestroyElements(std::addressof(GetAllocator()),
+ GetData(), GetSize());
+ }
+ }
+
+ ConstructionTransaction(const ConstructionTransaction&) = delete;
+ void operator=(const ConstructionTransaction&) = delete;
+
+ AllocatorType& GetAllocator() { return alloc_data_.template get<0>(); }
+ Pointer& GetData() { return alloc_data_.template get<1>(); }
+ SizeType& GetSize() { return size_; }
+
+ bool DidConstruct() { return GetData() != nullptr; }
+ template <typename ValueAdapter>
+ void Construct(Pointer data, ValueAdapter* values_ptr, SizeType size) {
+ inlined_vector_internal::ConstructElements(std::addressof(GetAllocator()),
+ data, values_ptr, size);
+ GetData() = data;
+ GetSize() = size;
+ }
+ void Commit() {
+ GetData() = nullptr;
+ GetSize() = 0;
+ }
+
+ private:
+ container_internal::CompressedTuple<AllocatorType, Pointer> alloc_data_;
+ SizeType size_ = 0;
+};
+
+template <typename T, size_t N, typename A>
+class Storage {
+ public:
+ using AllocatorTraits = absl::allocator_traits<A>;
+ using allocator_type = typename AllocatorTraits::allocator_type;
+ using value_type = typename AllocatorTraits::value_type;
+ using pointer = typename AllocatorTraits::pointer;
+ using const_pointer = typename AllocatorTraits::const_pointer;
+ using size_type = typename AllocatorTraits::size_type;
+ using difference_type = typename AllocatorTraits::difference_type;
+
+ using reference = value_type&;
+ using const_reference = const value_type&;
+ using RValueReference = value_type&&;
+ using iterator = pointer;
+ using const_iterator = const_pointer;
+ using reverse_iterator = std::reverse_iterator<iterator>;
+ using const_reverse_iterator = std::reverse_iterator<const_iterator>;
+ using MoveIterator = std::move_iterator<iterator>;
+ using IsMemcpyOk = inlined_vector_internal::IsMemcpyOk<allocator_type>;
+
+ using StorageView = inlined_vector_internal::StorageView<allocator_type>;
+
+ template <typename Iterator>
+ using IteratorValueAdapter =
+ inlined_vector_internal::IteratorValueAdapter<allocator_type, Iterator>;
+ using CopyValueAdapter =
+ inlined_vector_internal::CopyValueAdapter<allocator_type>;
+ using DefaultValueAdapter =
+ inlined_vector_internal::DefaultValueAdapter<allocator_type>;
+
+ using AllocationTransaction =
+ inlined_vector_internal::AllocationTransaction<allocator_type>;
+ using ConstructionTransaction =
+ inlined_vector_internal::ConstructionTransaction<allocator_type>;
+
+ static size_type NextCapacity(size_type current_capacity) {
+ return current_capacity * 2;
+ }
+
+ static size_type ComputeCapacity(size_type current_capacity,
+ size_type requested_capacity) {
+ return (std::max)(NextCapacity(current_capacity), requested_capacity);
+ }
+
+ // ---------------------------------------------------------------------------
+ // Storage Constructors and Destructor
+ // ---------------------------------------------------------------------------
+
+ Storage() : metadata_() {}
+
+ explicit Storage(const allocator_type& alloc) : metadata_(alloc, {}) {}
+
+ ~Storage() {
+ pointer data = GetIsAllocated() ? GetAllocatedData() : GetInlinedData();
+ inlined_vector_internal::DestroyElements(GetAllocPtr(), data, GetSize());
+ DeallocateIfAllocated();
+ }
+
+ // ---------------------------------------------------------------------------
+ // Storage Member Accessors
+ // ---------------------------------------------------------------------------
+
+ size_type& GetSizeAndIsAllocated() { return metadata_.template get<1>(); }
+
+ const size_type& GetSizeAndIsAllocated() const {
+ return metadata_.template get<1>();
+ }
+
+ size_type GetSize() const { return GetSizeAndIsAllocated() >> 1; }
+
+ bool GetIsAllocated() const { return GetSizeAndIsAllocated() & 1; }
+
+ pointer GetAllocatedData() { return data_.allocated.allocated_data; }
+
+ const_pointer GetAllocatedData() const {
+ return data_.allocated.allocated_data;
+ }
+
+ pointer GetInlinedData() {
+ return reinterpret_cast<pointer>(
+ std::addressof(data_.inlined.inlined_data[0]));
+ }
+
+ const_pointer GetInlinedData() const {
+ return reinterpret_cast<const_pointer>(
+ std::addressof(data_.inlined.inlined_data[0]));
+ }
+
+ size_type GetAllocatedCapacity() const {
+ return data_.allocated.allocated_capacity;
+ }
+
+ size_type GetInlinedCapacity() const { return static_cast<size_type>(N); }
+
+ StorageView MakeStorageView() {
+ return GetIsAllocated()
+ ? StorageView{GetAllocatedData(), GetSize(),
+ GetAllocatedCapacity()}
+ : StorageView{GetInlinedData(), GetSize(), GetInlinedCapacity()};
+ }
+
+ allocator_type* GetAllocPtr() {
+ return std::addressof(metadata_.template get<0>());
+ }
+
+ const allocator_type* GetAllocPtr() const {
+ return std::addressof(metadata_.template get<0>());
+ }
+
+ // ---------------------------------------------------------------------------
+ // Storage Member Mutators
+ // ---------------------------------------------------------------------------
+
+ template <typename ValueAdapter>
+ void Initialize(ValueAdapter values, size_type new_size);
+
+ template <typename ValueAdapter>
+ void Assign(ValueAdapter values, size_type new_size);
+
+ template <typename ValueAdapter>
+ void Resize(ValueAdapter values, size_type new_size);
+
+ template <typename ValueAdapter>
+ iterator Insert(const_iterator pos, ValueAdapter values,
+ size_type insert_count);
+
+ template <typename... Args>
+ reference EmplaceBack(Args&&... args);
+
+ iterator Erase(const_iterator from, const_iterator to);
+
+ void Reserve(size_type requested_capacity);
+
+ void ShrinkToFit();
+
+ void Swap(Storage* other_storage_ptr);
+
+ void SetIsAllocated() {
+ GetSizeAndIsAllocated() |= static_cast<size_type>(1);
+ }
+
+ void UnsetIsAllocated() {
+ GetSizeAndIsAllocated() &= ((std::numeric_limits<size_type>::max)() - 1);
+ }
+
+ void SetSize(size_type size) {
+ GetSizeAndIsAllocated() =
+ (size << 1) | static_cast<size_type>(GetIsAllocated());
+ }
+
+ void SetAllocatedSize(size_type size) {
+ GetSizeAndIsAllocated() = (size << 1) | static_cast<size_type>(1);
+ }
+
+ void SetInlinedSize(size_type size) {
+ GetSizeAndIsAllocated() = size << static_cast<size_type>(1);
+ }
+
+ void AddSize(size_type count) {
+ GetSizeAndIsAllocated() += count << static_cast<size_type>(1);
+ }
+
+ void SubtractSize(size_type count) {
+ assert(count <= GetSize());
+
+ GetSizeAndIsAllocated() -= count << static_cast<size_type>(1);
+ }
+
+ void SetAllocatedData(pointer data, size_type capacity) {
+ data_.allocated.allocated_data = data;
+ data_.allocated.allocated_capacity = capacity;
+ }
+
+ void AcquireAllocatedData(AllocationTransaction* allocation_tx_ptr) {
+ SetAllocatedData(allocation_tx_ptr->GetData(),
+ allocation_tx_ptr->GetCapacity());
+
+ allocation_tx_ptr->Reset();
+ }
+
+ void MemcpyFrom(const Storage& other_storage) {
+ assert(IsMemcpyOk::value || other_storage.GetIsAllocated());
+
+ GetSizeAndIsAllocated() = other_storage.GetSizeAndIsAllocated();
+ data_ = other_storage.data_;
+ }
+
+ void DeallocateIfAllocated() {
+ if (GetIsAllocated()) {
+ AllocatorTraits::deallocate(*GetAllocPtr(), GetAllocatedData(),
+ GetAllocatedCapacity());
+ }
+ }
+
+ private:
+ using Metadata =
+ container_internal::CompressedTuple<allocator_type, size_type>;
+
+ struct Allocated {
+ pointer allocated_data;
+ size_type allocated_capacity;
+ };
+
+ struct Inlined {
+ alignas(value_type) char inlined_data[sizeof(value_type[N])];
+ };
+
+ union Data {
+ Allocated allocated;
+ Inlined inlined;
+ };
+
+ template <typename... Args>
+ ABSL_ATTRIBUTE_NOINLINE reference EmplaceBackSlow(Args&&... args);
+
+ Metadata metadata_;
+ Data data_;
+};
+
+template <typename T, size_t N, typename A>
+template <typename ValueAdapter>
+auto Storage<T, N, A>::Initialize(ValueAdapter values, size_type new_size)
+ -> void {
+ // Only callable from constructors!
+ assert(!GetIsAllocated());
+ assert(GetSize() == 0);
+
+ pointer construct_data;
+ if (new_size > GetInlinedCapacity()) {
+ // Because this is only called from the `InlinedVector` constructors, it's
+ // safe to take on the allocation with size `0`. If `ConstructElements(...)`
+ // throws, deallocation will be automatically handled by `~Storage()`.
+ size_type new_capacity = ComputeCapacity(GetInlinedCapacity(), new_size);
+ construct_data = AllocatorTraits::allocate(*GetAllocPtr(), new_capacity);
+ SetAllocatedData(construct_data, new_capacity);
+ SetIsAllocated();
+ } else {
+ construct_data = GetInlinedData();
+ }
+
+ inlined_vector_internal::ConstructElements(GetAllocPtr(), construct_data,
+ &values, new_size);
+
+ // Since the initial size was guaranteed to be `0` and the allocated bit is
+ // already correct for either case, *adding* `new_size` gives us the correct
+ // result faster than setting it directly.
+ AddSize(new_size);
+}
+
+template <typename T, size_t N, typename A>
+template <typename ValueAdapter>
+auto Storage<T, N, A>::Assign(ValueAdapter values, size_type new_size) -> void {
+ StorageView storage_view = MakeStorageView();
+
+ AllocationTransaction allocation_tx(GetAllocPtr());
+
+ absl::Span<value_type> assign_loop;
+ absl::Span<value_type> construct_loop;
+ absl::Span<value_type> destroy_loop;
+
+ if (new_size > storage_view.capacity) {
+ size_type new_capacity = ComputeCapacity(storage_view.capacity, new_size);
+ construct_loop = {allocation_tx.Allocate(new_capacity), new_size};
+ destroy_loop = {storage_view.data, storage_view.size};
+ } else if (new_size > storage_view.size) {
+ assign_loop = {storage_view.data, storage_view.size};
+ construct_loop = {storage_view.data + storage_view.size,
+ new_size - storage_view.size};
+ } else {
+ assign_loop = {storage_view.data, new_size};
+ destroy_loop = {storage_view.data + new_size, storage_view.size - new_size};
+ }
+
+ inlined_vector_internal::AssignElements(assign_loop.data(), &values,
+ assign_loop.size());
+
+ inlined_vector_internal::ConstructElements(
+ GetAllocPtr(), construct_loop.data(), &values, construct_loop.size());
+
+ inlined_vector_internal::DestroyElements(GetAllocPtr(), destroy_loop.data(),
+ destroy_loop.size());
+
+ if (allocation_tx.DidAllocate()) {
+ DeallocateIfAllocated();
+ AcquireAllocatedData(&allocation_tx);
+ SetIsAllocated();
+ }
+
+ SetSize(new_size);
+}
+
+template <typename T, size_t N, typename A>
+template <typename ValueAdapter>
+auto Storage<T, N, A>::Resize(ValueAdapter values, size_type new_size) -> void {
+ StorageView storage_view = MakeStorageView();
+ auto* const base = storage_view.data;
+ const size_type size = storage_view.size;
+ auto* alloc = GetAllocPtr();
+ if (new_size <= size) {
+ // Destroy extra old elements.
+ inlined_vector_internal::DestroyElements(alloc, base + new_size,
+ size - new_size);
+ } else if (new_size <= storage_view.capacity) {
+ // Construct new elements in place.
+ inlined_vector_internal::ConstructElements(alloc, base + size, &values,
+ new_size - size);
+ } else {
+ // Steps:
+ // a. Allocate new backing store.
+ // b. Construct new elements in new backing store.
+ // c. Move existing elements from old backing store to now.
+ // d. Destroy all elements in old backing store.
+ // Use transactional wrappers for the first two steps so we can roll
+ // back if necessary due to exceptions.
+ AllocationTransaction allocation_tx(alloc);
+ size_type new_capacity = ComputeCapacity(storage_view.capacity, new_size);
+ pointer new_data = allocation_tx.Allocate(new_capacity);
+
+ ConstructionTransaction construction_tx(alloc);
+ construction_tx.Construct(new_data + size, &values, new_size - size);
+
+ IteratorValueAdapter<MoveIterator> move_values((MoveIterator(base)));
+ inlined_vector_internal::ConstructElements(alloc, new_data, &move_values,
+ size);
+
+ inlined_vector_internal::DestroyElements(alloc, base, size);
+ construction_tx.Commit();
+ DeallocateIfAllocated();
+ AcquireAllocatedData(&allocation_tx);
+ SetIsAllocated();
+ }
+ SetSize(new_size);
+}
+
+template <typename T, size_t N, typename A>
+template <typename ValueAdapter>
+auto Storage<T, N, A>::Insert(const_iterator pos, ValueAdapter values,
+ size_type insert_count) -> iterator {
+ StorageView storage_view = MakeStorageView();
+
+ size_type insert_index =
+ std::distance(const_iterator(storage_view.data), pos);
+ size_type insert_end_index = insert_index + insert_count;
+ size_type new_size = storage_view.size + insert_count;
+
+ if (new_size > storage_view.capacity) {
+ AllocationTransaction allocation_tx(GetAllocPtr());
+ ConstructionTransaction construction_tx(GetAllocPtr());
+ ConstructionTransaction move_construciton_tx(GetAllocPtr());
+
+ IteratorValueAdapter<MoveIterator> move_values(
+ MoveIterator(storage_view.data));
+
+ size_type new_capacity = ComputeCapacity(storage_view.capacity, new_size);
+ pointer new_data = allocation_tx.Allocate(new_capacity);
+
+ construction_tx.Construct(new_data + insert_index, &values, insert_count);
+
+ move_construciton_tx.Construct(new_data, &move_values, insert_index);
+
+ inlined_vector_internal::ConstructElements(
+ GetAllocPtr(), new_data + insert_end_index, &move_values,
+ storage_view.size - insert_index);
+
+ inlined_vector_internal::DestroyElements(GetAllocPtr(), storage_view.data,
+ storage_view.size);
+
+ construction_tx.Commit();
+ move_construciton_tx.Commit();
+ DeallocateIfAllocated();
+ AcquireAllocatedData(&allocation_tx);
+
+ SetAllocatedSize(new_size);
+ return iterator(new_data + insert_index);
+ } else {
+ size_type move_construction_destination_index =
+ (std::max)(insert_end_index, storage_view.size);
+
+ ConstructionTransaction move_construction_tx(GetAllocPtr());
+
+ IteratorValueAdapter<MoveIterator> move_construction_values(
+ MoveIterator(storage_view.data +
+ (move_construction_destination_index - insert_count)));
+ absl::Span<value_type> move_construction = {
+ storage_view.data + move_construction_destination_index,
+ new_size - move_construction_destination_index};
+
+ pointer move_assignment_values = storage_view.data + insert_index;
+ absl::Span<value_type> move_assignment = {
+ storage_view.data + insert_end_index,
+ move_construction_destination_index - insert_end_index};
+
+ absl::Span<value_type> insert_assignment = {move_assignment_values,
+ move_construction.size()};
+
+ absl::Span<value_type> insert_construction = {
+ insert_assignment.data() + insert_assignment.size(),
+ insert_count - insert_assignment.size()};
+
+ move_construction_tx.Construct(move_construction.data(),
+ &move_construction_values,
+ move_construction.size());
+
+ for (pointer destination = move_assignment.data() + move_assignment.size(),
+ last_destination = move_assignment.data(),
+ source = move_assignment_values + move_assignment.size();
+ ;) {
+ --destination;
+ --source;
+ if (destination < last_destination) break;
+ *destination = std::move(*source);
+ }
+
+ inlined_vector_internal::AssignElements(insert_assignment.data(), &values,
+ insert_assignment.size());
+
+ inlined_vector_internal::ConstructElements(
+ GetAllocPtr(), insert_construction.data(), &values,
+ insert_construction.size());
+
+ move_construction_tx.Commit();
+
+ AddSize(insert_count);
+ return iterator(storage_view.data + insert_index);
+ }
+}
+
+template <typename T, size_t N, typename A>
+template <typename... Args>
+auto Storage<T, N, A>::EmplaceBack(Args&&... args) -> reference {
+ StorageView storage_view = MakeStorageView();
+ const auto n = storage_view.size;
+ if (ABSL_PREDICT_TRUE(n != storage_view.capacity)) {
+ // Fast path; new element fits.
+ pointer last_ptr = storage_view.data + n;
+ AllocatorTraits::construct(*GetAllocPtr(), last_ptr,
+ std::forward<Args>(args)...);
+ AddSize(1);
+ return *last_ptr;
+ }
+ // TODO(b/173712035): Annotate with musttail attribute to prevent regression.
+ return EmplaceBackSlow(std::forward<Args>(args)...);
+}
+
+template <typename T, size_t N, typename A>
+template <typename... Args>
+auto Storage<T, N, A>::EmplaceBackSlow(Args&&... args) -> reference {
+ StorageView storage_view = MakeStorageView();
+ AllocationTransaction allocation_tx(GetAllocPtr());
+ IteratorValueAdapter<MoveIterator> move_values(
+ MoveIterator(storage_view.data));
+ size_type new_capacity = NextCapacity(storage_view.capacity);
+ pointer construct_data = allocation_tx.Allocate(new_capacity);
+ pointer last_ptr = construct_data + storage_view.size;
+
+ // Construct new element.
+ AllocatorTraits::construct(*GetAllocPtr(), last_ptr,
+ std::forward<Args>(args)...);
+ // Move elements from old backing store to new backing store.
+ ABSL_INTERNAL_TRY {
+ inlined_vector_internal::ConstructElements(
+ GetAllocPtr(), allocation_tx.GetData(), &move_values,
+ storage_view.size);
+ }
+ ABSL_INTERNAL_CATCH_ANY {
+ AllocatorTraits::destroy(*GetAllocPtr(), last_ptr);
+ ABSL_INTERNAL_RETHROW;
+ }
+ // Destroy elements in old backing store.
+ inlined_vector_internal::DestroyElements(GetAllocPtr(), storage_view.data,
+ storage_view.size);
+
+ DeallocateIfAllocated();
+ AcquireAllocatedData(&allocation_tx);
+ SetIsAllocated();
+ AddSize(1);
+ return *last_ptr;
+}
+
+template <typename T, size_t N, typename A>
+auto Storage<T, N, A>::Erase(const_iterator from, const_iterator to)
+ -> iterator {
+ StorageView storage_view = MakeStorageView();
+
+ size_type erase_size = std::distance(from, to);
+ size_type erase_index =
+ std::distance(const_iterator(storage_view.data), from);
+ size_type erase_end_index = erase_index + erase_size;
+
+ IteratorValueAdapter<MoveIterator> move_values(
+ MoveIterator(storage_view.data + erase_end_index));
+
+ inlined_vector_internal::AssignElements(storage_view.data + erase_index,
+ &move_values,
+ storage_view.size - erase_end_index);
+
+ inlined_vector_internal::DestroyElements(
+ GetAllocPtr(), storage_view.data + (storage_view.size - erase_size),
+ erase_size);
+
+ SubtractSize(erase_size);
+ return iterator(storage_view.data + erase_index);
+}
+
+template <typename T, size_t N, typename A>
+auto Storage<T, N, A>::Reserve(size_type requested_capacity) -> void {
+ StorageView storage_view = MakeStorageView();
+
+ if (ABSL_PREDICT_FALSE(requested_capacity <= storage_view.capacity)) return;
+
+ AllocationTransaction allocation_tx(GetAllocPtr());
+
+ IteratorValueAdapter<MoveIterator> move_values(
+ MoveIterator(storage_view.data));
+
+ size_type new_capacity =
+ ComputeCapacity(storage_view.capacity, requested_capacity);
+ pointer new_data = allocation_tx.Allocate(new_capacity);
+
+ inlined_vector_internal::ConstructElements(GetAllocPtr(), new_data,
+ &move_values, storage_view.size);
+
+ inlined_vector_internal::DestroyElements(GetAllocPtr(), storage_view.data,
+ storage_view.size);
+
+ DeallocateIfAllocated();
+ AcquireAllocatedData(&allocation_tx);
+ SetIsAllocated();
+}
+
+template <typename T, size_t N, typename A>
+auto Storage<T, N, A>::ShrinkToFit() -> void {
+ // May only be called on allocated instances!
+ assert(GetIsAllocated());
+
+ StorageView storage_view{GetAllocatedData(), GetSize(),
+ GetAllocatedCapacity()};
+
+ if (ABSL_PREDICT_FALSE(storage_view.size == storage_view.capacity)) return;
+
+ AllocationTransaction allocation_tx(GetAllocPtr());
+
+ IteratorValueAdapter<MoveIterator> move_values(
+ MoveIterator(storage_view.data));
+
+ pointer construct_data;
+ if (storage_view.size > GetInlinedCapacity()) {
+ size_type new_capacity = storage_view.size;
+ construct_data = allocation_tx.Allocate(new_capacity);
+ } else {
+ construct_data = GetInlinedData();
+ }
+
+ ABSL_INTERNAL_TRY {
+ inlined_vector_internal::ConstructElements(GetAllocPtr(), construct_data,
+ &move_values, storage_view.size);
+ }
+ ABSL_INTERNAL_CATCH_ANY {
+ SetAllocatedData(storage_view.data, storage_view.capacity);
+ ABSL_INTERNAL_RETHROW;
+ }
+
+ inlined_vector_internal::DestroyElements(GetAllocPtr(), storage_view.data,
+ storage_view.size);
+
+ AllocatorTraits::deallocate(*GetAllocPtr(), storage_view.data,
+ storage_view.capacity);
+
+ if (allocation_tx.DidAllocate()) {
+ AcquireAllocatedData(&allocation_tx);
+ } else {
+ UnsetIsAllocated();
+ }
+}
+
+template <typename T, size_t N, typename A>
+auto Storage<T, N, A>::Swap(Storage* other_storage_ptr) -> void {
+ using std::swap;
+ assert(this != other_storage_ptr);
+
+ if (GetIsAllocated() && other_storage_ptr->GetIsAllocated()) {
+ swap(data_.allocated, other_storage_ptr->data_.allocated);
+ } else if (!GetIsAllocated() && !other_storage_ptr->GetIsAllocated()) {
+ Storage* small_ptr = this;
+ Storage* large_ptr = other_storage_ptr;
+ if (small_ptr->GetSize() > large_ptr->GetSize()) swap(small_ptr, large_ptr);
+
+ for (size_type i = 0; i < small_ptr->GetSize(); ++i) {
+ swap(small_ptr->GetInlinedData()[i], large_ptr->GetInlinedData()[i]);
+ }
+
+ IteratorValueAdapter<MoveIterator> move_values(
+ MoveIterator(large_ptr->GetInlinedData() + small_ptr->GetSize()));
+
+ inlined_vector_internal::ConstructElements(
+ large_ptr->GetAllocPtr(),
+ small_ptr->GetInlinedData() + small_ptr->GetSize(), &move_values,
+ large_ptr->GetSize() - small_ptr->GetSize());
+
+ inlined_vector_internal::DestroyElements(
+ large_ptr->GetAllocPtr(),
+ large_ptr->GetInlinedData() + small_ptr->GetSize(),
+ large_ptr->GetSize() - small_ptr->GetSize());
+ } else {
+ Storage* allocated_ptr = this;
+ Storage* inlined_ptr = other_storage_ptr;
+ if (!allocated_ptr->GetIsAllocated()) swap(allocated_ptr, inlined_ptr);
+
+ StorageView allocated_storage_view{allocated_ptr->GetAllocatedData(),
+ allocated_ptr->GetSize(),
+ allocated_ptr->GetAllocatedCapacity()};
+
+ IteratorValueAdapter<MoveIterator> move_values(
+ MoveIterator(inlined_ptr->GetInlinedData()));
+
+ ABSL_INTERNAL_TRY {
+ inlined_vector_internal::ConstructElements(
+ inlined_ptr->GetAllocPtr(), allocated_ptr->GetInlinedData(),
+ &move_values, inlined_ptr->GetSize());
+ }
+ ABSL_INTERNAL_CATCH_ANY {
+ allocated_ptr->SetAllocatedData(allocated_storage_view.data,
+ allocated_storage_view.capacity);
+ ABSL_INTERNAL_RETHROW;
+ }
+
+ inlined_vector_internal::DestroyElements(inlined_ptr->GetAllocPtr(),
+ inlined_ptr->GetInlinedData(),
+ inlined_ptr->GetSize());
+
+ inlined_ptr->SetAllocatedData(allocated_storage_view.data,
+ allocated_storage_view.capacity);
+ }
+
+ swap(GetSizeAndIsAllocated(), other_storage_ptr->GetSizeAndIsAllocated());
+ swap(*GetAllocPtr(), *other_storage_ptr->GetAllocPtr());
+}
+
+} // namespace inlined_vector_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_CONTAINER_INTERNAL_INLINED_VECTOR_INTERNAL_H_
diff --git a/third_party/abseil/src/absl/container/internal/layout.h b/third_party/abseil/src/absl/container/internal/layout.h
new file mode 100644
index 0000000..2336783
--- /dev/null
+++ b/third_party/abseil/src/absl/container/internal/layout.h
@@ -0,0 +1,743 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// MOTIVATION AND TUTORIAL
+//
+// If you want to put in a single heap allocation N doubles followed by M ints,
+// it's easy if N and M are known at compile time.
+//
+// struct S {
+// double a[N];
+// int b[M];
+// };
+//
+// S* p = new S;
+//
+// But what if N and M are known only in run time? Class template Layout to the
+// rescue! It's a portable generalization of the technique known as struct hack.
+//
+// // This object will tell us everything we need to know about the memory
+// // layout of double[N] followed by int[M]. It's structurally identical to
+// // size_t[2] that stores N and M. It's very cheap to create.
+// const Layout<double, int> layout(N, M);
+//
+// // Allocate enough memory for both arrays. `AllocSize()` tells us how much
+// // memory is needed. We are free to use any allocation function we want as
+// // long as it returns aligned memory.
+// std::unique_ptr<unsigned char[]> p(new unsigned char[layout.AllocSize()]);
+//
+// // Obtain the pointer to the array of doubles.
+// // Equivalent to `reinterpret_cast<double*>(p.get())`.
+// //
+// // We could have written layout.Pointer<0>(p) instead. If all the types are
+// // unique you can use either form, but if some types are repeated you must
+// // use the index form.
+// double* a = layout.Pointer<double>(p.get());
+//
+// // Obtain the pointer to the array of ints.
+// // Equivalent to `reinterpret_cast<int*>(p.get() + N * 8)`.
+// int* b = layout.Pointer<int>(p);
+//
+// If we are unable to specify sizes of all fields, we can pass as many sizes as
+// we can to `Partial()`. In return, it'll allow us to access the fields whose
+// locations and sizes can be computed from the provided information.
+// `Partial()` comes in handy when the array sizes are embedded into the
+// allocation.
+//
+// // size_t[1] containing N, size_t[1] containing M, double[N], int[M].
+// using L = Layout<size_t, size_t, double, int>;
+//
+// unsigned char* Allocate(size_t n, size_t m) {
+// const L layout(1, 1, n, m);
+// unsigned char* p = new unsigned char[layout.AllocSize()];
+// *layout.Pointer<0>(p) = n;
+// *layout.Pointer<1>(p) = m;
+// return p;
+// }
+//
+// void Use(unsigned char* p) {
+// // First, extract N and M.
+// // Specify that the first array has only one element. Using `prefix` we
+// // can access the first two arrays but not more.
+// constexpr auto prefix = L::Partial(1);
+// size_t n = *prefix.Pointer<0>(p);
+// size_t m = *prefix.Pointer<1>(p);
+//
+// // Now we can get pointers to the payload.
+// const L layout(1, 1, n, m);
+// double* a = layout.Pointer<double>(p);
+// int* b = layout.Pointer<int>(p);
+// }
+//
+// The layout we used above combines fixed-size with dynamically-sized fields.
+// This is quite common. Layout is optimized for this use case and generates
+// optimal code. All computations that can be performed at compile time are
+// indeed performed at compile time.
+//
+// Efficiency tip: The order of fields matters. In `Layout<T1, ..., TN>` try to
+// ensure that `alignof(T1) >= ... >= alignof(TN)`. This way you'll have no
+// padding in between arrays.
+//
+// You can manually override the alignment of an array by wrapping the type in
+// `Aligned<T, N>`. `Layout<..., Aligned<T, N>, ...>` has exactly the same API
+// and behavior as `Layout<..., T, ...>` except that the first element of the
+// array of `T` is aligned to `N` (the rest of the elements follow without
+// padding). `N` cannot be less than `alignof(T)`.
+//
+// `AllocSize()` and `Pointer()` are the most basic methods for dealing with
+// memory layouts. Check out the reference or code below to discover more.
+//
+// EXAMPLE
+//
+// // Immutable move-only string with sizeof equal to sizeof(void*). The
+// // string size and the characters are kept in the same heap allocation.
+// class CompactString {
+// public:
+// CompactString(const char* s = "") {
+// const size_t size = strlen(s);
+// // size_t[1] followed by char[size + 1].
+// const L layout(1, size + 1);
+// p_.reset(new unsigned char[layout.AllocSize()]);
+// // If running under ASAN, mark the padding bytes, if any, to catch
+// // memory errors.
+// layout.PoisonPadding(p_.get());
+// // Store the size in the allocation.
+// *layout.Pointer<size_t>(p_.get()) = size;
+// // Store the characters in the allocation.
+// memcpy(layout.Pointer<char>(p_.get()), s, size + 1);
+// }
+//
+// size_t size() const {
+// // Equivalent to reinterpret_cast<size_t&>(*p).
+// return *L::Partial().Pointer<size_t>(p_.get());
+// }
+//
+// const char* c_str() const {
+// // Equivalent to reinterpret_cast<char*>(p.get() + sizeof(size_t)).
+// // The argument in Partial(1) specifies that we have size_t[1] in front
+// // of the characters.
+// return L::Partial(1).Pointer<char>(p_.get());
+// }
+//
+// private:
+// // Our heap allocation contains a size_t followed by an array of chars.
+// using L = Layout<size_t, char>;
+// std::unique_ptr<unsigned char[]> p_;
+// };
+//
+// int main() {
+// CompactString s = "hello";
+// assert(s.size() == 5);
+// assert(strcmp(s.c_str(), "hello") == 0);
+// }
+//
+// DOCUMENTATION
+//
+// The interface exported by this file consists of:
+// - class `Layout<>` and its public members.
+// - The public members of class `internal_layout::LayoutImpl<>`. That class
+// isn't intended to be used directly, and its name and template parameter
+// list are internal implementation details, but the class itself provides
+// most of the functionality in this file. See comments on its members for
+// detailed documentation.
+//
+// `Layout<T1,... Tn>::Partial(count1,..., countm)` (where `m` <= `n`) returns a
+// `LayoutImpl<>` object. `Layout<T1,..., Tn> layout(count1,..., countn)`
+// creates a `Layout` object, which exposes the same functionality by inheriting
+// from `LayoutImpl<>`.
+
+#ifndef ABSL_CONTAINER_INTERNAL_LAYOUT_H_
+#define ABSL_CONTAINER_INTERNAL_LAYOUT_H_
+
+#include <assert.h>
+#include <stddef.h>
+#include <stdint.h>
+
+#include <ostream>
+#include <string>
+#include <tuple>
+#include <type_traits>
+#include <typeinfo>
+#include <utility>
+
+#include "absl/base/config.h"
+#include "absl/meta/type_traits.h"
+#include "absl/strings/str_cat.h"
+#include "absl/types/span.h"
+#include "absl/utility/utility.h"
+
+#ifdef ABSL_HAVE_ADDRESS_SANITIZER
+#include <sanitizer/asan_interface.h>
+#endif
+
+#if defined(__GXX_RTTI)
+#define ABSL_INTERNAL_HAS_CXA_DEMANGLE
+#endif
+
+#ifdef ABSL_INTERNAL_HAS_CXA_DEMANGLE
+#include <cxxabi.h>
+#endif
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace container_internal {
+
+// A type wrapper that instructs `Layout` to use the specific alignment for the
+// array. `Layout<..., Aligned<T, N>, ...>` has exactly the same API
+// and behavior as `Layout<..., T, ...>` except that the first element of the
+// array of `T` is aligned to `N` (the rest of the elements follow without
+// padding).
+//
+// Requires: `N >= alignof(T)` and `N` is a power of 2.
+template <class T, size_t N>
+struct Aligned;
+
+namespace internal_layout {
+
+template <class T>
+struct NotAligned {};
+
+template <class T, size_t N>
+struct NotAligned<const Aligned<T, N>> {
+ static_assert(sizeof(T) == 0, "Aligned<T, N> cannot be const-qualified");
+};
+
+template <size_t>
+using IntToSize = size_t;
+
+template <class>
+using TypeToSize = size_t;
+
+template <class T>
+struct Type : NotAligned<T> {
+ using type = T;
+};
+
+template <class T, size_t N>
+struct Type<Aligned<T, N>> {
+ using type = T;
+};
+
+template <class T>
+struct SizeOf : NotAligned<T>, std::integral_constant<size_t, sizeof(T)> {};
+
+template <class T, size_t N>
+struct SizeOf<Aligned<T, N>> : std::integral_constant<size_t, sizeof(T)> {};
+
+// Note: workaround for https://gcc.gnu.org/PR88115
+template <class T>
+struct AlignOf : NotAligned<T> {
+ static constexpr size_t value = alignof(T);
+};
+
+template <class T, size_t N>
+struct AlignOf<Aligned<T, N>> {
+ static_assert(N % alignof(T) == 0,
+ "Custom alignment can't be lower than the type's alignment");
+ static constexpr size_t value = N;
+};
+
+// Does `Ts...` contain `T`?
+template <class T, class... Ts>
+using Contains = absl::disjunction<std::is_same<T, Ts>...>;
+
+template <class From, class To>
+using CopyConst =
+ typename std::conditional<std::is_const<From>::value, const To, To>::type;
+
+// Note: We're not qualifying this with absl:: because it doesn't compile under
+// MSVC.
+template <class T>
+using SliceType = Span<T>;
+
+// This namespace contains no types. It prevents functions defined in it from
+// being found by ADL.
+namespace adl_barrier {
+
+template <class Needle, class... Ts>
+constexpr size_t Find(Needle, Needle, Ts...) {
+ static_assert(!Contains<Needle, Ts...>(), "Duplicate element type");
+ return 0;
+}
+
+template <class Needle, class T, class... Ts>
+constexpr size_t Find(Needle, T, Ts...) {
+ return adl_barrier::Find(Needle(), Ts()...) + 1;
+}
+
+constexpr bool IsPow2(size_t n) { return !(n & (n - 1)); }
+
+// Returns `q * m` for the smallest `q` such that `q * m >= n`.
+// Requires: `m` is a power of two. It's enforced by IsLegalElementType below.
+constexpr size_t Align(size_t n, size_t m) { return (n + m - 1) & ~(m - 1); }
+
+constexpr size_t Min(size_t a, size_t b) { return b < a ? b : a; }
+
+constexpr size_t Max(size_t a) { return a; }
+
+template <class... Ts>
+constexpr size_t Max(size_t a, size_t b, Ts... rest) {
+ return adl_barrier::Max(b < a ? a : b, rest...);
+}
+
+template <class T>
+std::string TypeName() {
+ std::string out;
+ int status = 0;
+ char* demangled = nullptr;
+#ifdef ABSL_INTERNAL_HAS_CXA_DEMANGLE
+ demangled = abi::__cxa_demangle(typeid(T).name(), nullptr, nullptr, &status);
+#endif
+ if (status == 0 && demangled != nullptr) { // Demangling succeeded.
+ absl::StrAppend(&out, "<", demangled, ">");
+ free(demangled);
+ } else {
+#if defined(__GXX_RTTI) || defined(_CPPRTTI)
+ absl::StrAppend(&out, "<", typeid(T).name(), ">");
+#endif
+ }
+ return out;
+}
+
+} // namespace adl_barrier
+
+template <bool C>
+using EnableIf = typename std::enable_if<C, int>::type;
+
+// Can `T` be a template argument of `Layout`?
+template <class T>
+using IsLegalElementType = std::integral_constant<
+ bool, !std::is_reference<T>::value && !std::is_volatile<T>::value &&
+ !std::is_reference<typename Type<T>::type>::value &&
+ !std::is_volatile<typename Type<T>::type>::value &&
+ adl_barrier::IsPow2(AlignOf<T>::value)>;
+
+template <class Elements, class SizeSeq, class OffsetSeq>
+class LayoutImpl;
+
+// Public base class of `Layout` and the result type of `Layout::Partial()`.
+//
+// `Elements...` contains all template arguments of `Layout` that created this
+// instance.
+//
+// `SizeSeq...` is `[0, NumSizes)` where `NumSizes` is the number of arguments
+// passed to `Layout::Partial()` or `Layout::Layout()`.
+//
+// `OffsetSeq...` is `[0, NumOffsets)` where `NumOffsets` is
+// `Min(sizeof...(Elements), NumSizes + 1)` (the number of arrays for which we
+// can compute offsets).
+template <class... Elements, size_t... SizeSeq, size_t... OffsetSeq>
+class LayoutImpl<std::tuple<Elements...>, absl::index_sequence<SizeSeq...>,
+ absl::index_sequence<OffsetSeq...>> {
+ private:
+ static_assert(sizeof...(Elements) > 0, "At least one field is required");
+ static_assert(absl::conjunction<IsLegalElementType<Elements>...>::value,
+ "Invalid element type (see IsLegalElementType)");
+
+ enum {
+ NumTypes = sizeof...(Elements),
+ NumSizes = sizeof...(SizeSeq),
+ NumOffsets = sizeof...(OffsetSeq),
+ };
+
+ // These are guaranteed by `Layout`.
+ static_assert(NumOffsets == adl_barrier::Min(NumTypes, NumSizes + 1),
+ "Internal error");
+ static_assert(NumTypes > 0, "Internal error");
+
+ // Returns the index of `T` in `Elements...`. Results in a compilation error
+ // if `Elements...` doesn't contain exactly one instance of `T`.
+ template <class T>
+ static constexpr size_t ElementIndex() {
+ static_assert(Contains<Type<T>, Type<typename Type<Elements>::type>...>(),
+ "Type not found");
+ return adl_barrier::Find(Type<T>(),
+ Type<typename Type<Elements>::type>()...);
+ }
+
+ template <size_t N>
+ using ElementAlignment =
+ AlignOf<typename std::tuple_element<N, std::tuple<Elements...>>::type>;
+
+ public:
+ // Element types of all arrays packed in a tuple.
+ using ElementTypes = std::tuple<typename Type<Elements>::type...>;
+
+ // Element type of the Nth array.
+ template <size_t N>
+ using ElementType = typename std::tuple_element<N, ElementTypes>::type;
+
+ constexpr explicit LayoutImpl(IntToSize<SizeSeq>... sizes)
+ : size_{sizes...} {}
+
+ // Alignment of the layout, equal to the strictest alignment of all elements.
+ // All pointers passed to the methods of layout must be aligned to this value.
+ static constexpr size_t Alignment() {
+ return adl_barrier::Max(AlignOf<Elements>::value...);
+ }
+
+ // Offset in bytes of the Nth array.
+ //
+ // // int[3], 4 bytes of padding, double[4].
+ // Layout<int, double> x(3, 4);
+ // assert(x.Offset<0>() == 0); // The ints starts from 0.
+ // assert(x.Offset<1>() == 16); // The doubles starts from 16.
+ //
+ // Requires: `N <= NumSizes && N < sizeof...(Ts)`.
+ template <size_t N, EnableIf<N == 0> = 0>
+ constexpr size_t Offset() const {
+ return 0;
+ }
+
+ template <size_t N, EnableIf<N != 0> = 0>
+ constexpr size_t Offset() const {
+ static_assert(N < NumOffsets, "Index out of bounds");
+ return adl_barrier::Align(
+ Offset<N - 1>() + SizeOf<ElementType<N - 1>>() * size_[N - 1],
+ ElementAlignment<N>::value);
+ }
+
+ // Offset in bytes of the array with the specified element type. There must
+ // be exactly one such array and its zero-based index must be at most
+ // `NumSizes`.
+ //
+ // // int[3], 4 bytes of padding, double[4].
+ // Layout<int, double> x(3, 4);
+ // assert(x.Offset<int>() == 0); // The ints starts from 0.
+ // assert(x.Offset<double>() == 16); // The doubles starts from 16.
+ template <class T>
+ constexpr size_t Offset() const {
+ return Offset<ElementIndex<T>()>();
+ }
+
+ // Offsets in bytes of all arrays for which the offsets are known.
+ constexpr std::array<size_t, NumOffsets> Offsets() const {
+ return {{Offset<OffsetSeq>()...}};
+ }
+
+ // The number of elements in the Nth array. This is the Nth argument of
+ // `Layout::Partial()` or `Layout::Layout()` (zero-based).
+ //
+ // // int[3], 4 bytes of padding, double[4].
+ // Layout<int, double> x(3, 4);
+ // assert(x.Size<0>() == 3);
+ // assert(x.Size<1>() == 4);
+ //
+ // Requires: `N < NumSizes`.
+ template <size_t N>
+ constexpr size_t Size() const {
+ static_assert(N < NumSizes, "Index out of bounds");
+ return size_[N];
+ }
+
+ // The number of elements in the array with the specified element type.
+ // There must be exactly one such array and its zero-based index must be
+ // at most `NumSizes`.
+ //
+ // // int[3], 4 bytes of padding, double[4].
+ // Layout<int, double> x(3, 4);
+ // assert(x.Size<int>() == 3);
+ // assert(x.Size<double>() == 4);
+ template <class T>
+ constexpr size_t Size() const {
+ return Size<ElementIndex<T>()>();
+ }
+
+ // The number of elements of all arrays for which they are known.
+ constexpr std::array<size_t, NumSizes> Sizes() const {
+ return {{Size<SizeSeq>()...}};
+ }
+
+ // Pointer to the beginning of the Nth array.
+ //
+ // `Char` must be `[const] [signed|unsigned] char`.
+ //
+ // // int[3], 4 bytes of padding, double[4].
+ // Layout<int, double> x(3, 4);
+ // unsigned char* p = new unsigned char[x.AllocSize()];
+ // int* ints = x.Pointer<0>(p);
+ // double* doubles = x.Pointer<1>(p);
+ //
+ // Requires: `N <= NumSizes && N < sizeof...(Ts)`.
+ // Requires: `p` is aligned to `Alignment()`.
+ template <size_t N, class Char>
+ CopyConst<Char, ElementType<N>>* Pointer(Char* p) const {
+ using C = typename std::remove_const<Char>::type;
+ static_assert(
+ std::is_same<C, char>() || std::is_same<C, unsigned char>() ||
+ std::is_same<C, signed char>(),
+ "The argument must be a pointer to [const] [signed|unsigned] char");
+ constexpr size_t alignment = Alignment();
+ (void)alignment;
+ assert(reinterpret_cast<uintptr_t>(p) % alignment == 0);
+ return reinterpret_cast<CopyConst<Char, ElementType<N>>*>(p + Offset<N>());
+ }
+
+ // Pointer to the beginning of the array with the specified element type.
+ // There must be exactly one such array and its zero-based index must be at
+ // most `NumSizes`.
+ //
+ // `Char` must be `[const] [signed|unsigned] char`.
+ //
+ // // int[3], 4 bytes of padding, double[4].
+ // Layout<int, double> x(3, 4);
+ // unsigned char* p = new unsigned char[x.AllocSize()];
+ // int* ints = x.Pointer<int>(p);
+ // double* doubles = x.Pointer<double>(p);
+ //
+ // Requires: `p` is aligned to `Alignment()`.
+ template <class T, class Char>
+ CopyConst<Char, T>* Pointer(Char* p) const {
+ return Pointer<ElementIndex<T>()>(p);
+ }
+
+ // Pointers to all arrays for which pointers are known.
+ //
+ // `Char` must be `[const] [signed|unsigned] char`.
+ //
+ // // int[3], 4 bytes of padding, double[4].
+ // Layout<int, double> x(3, 4);
+ // unsigned char* p = new unsigned char[x.AllocSize()];
+ //
+ // int* ints;
+ // double* doubles;
+ // std::tie(ints, doubles) = x.Pointers(p);
+ //
+ // Requires: `p` is aligned to `Alignment()`.
+ //
+ // Note: We're not using ElementType alias here because it does not compile
+ // under MSVC.
+ template <class Char>
+ std::tuple<CopyConst<
+ Char, typename std::tuple_element<OffsetSeq, ElementTypes>::type>*...>
+ Pointers(Char* p) const {
+ return std::tuple<CopyConst<Char, ElementType<OffsetSeq>>*...>(
+ Pointer<OffsetSeq>(p)...);
+ }
+
+ // The Nth array.
+ //
+ // `Char` must be `[const] [signed|unsigned] char`.
+ //
+ // // int[3], 4 bytes of padding, double[4].
+ // Layout<int, double> x(3, 4);
+ // unsigned char* p = new unsigned char[x.AllocSize()];
+ // Span<int> ints = x.Slice<0>(p);
+ // Span<double> doubles = x.Slice<1>(p);
+ //
+ // Requires: `N < NumSizes`.
+ // Requires: `p` is aligned to `Alignment()`.
+ template <size_t N, class Char>
+ SliceType<CopyConst<Char, ElementType<N>>> Slice(Char* p) const {
+ return SliceType<CopyConst<Char, ElementType<N>>>(Pointer<N>(p), Size<N>());
+ }
+
+ // The array with the specified element type. There must be exactly one
+ // such array and its zero-based index must be less than `NumSizes`.
+ //
+ // `Char` must be `[const] [signed|unsigned] char`.
+ //
+ // // int[3], 4 bytes of padding, double[4].
+ // Layout<int, double> x(3, 4);
+ // unsigned char* p = new unsigned char[x.AllocSize()];
+ // Span<int> ints = x.Slice<int>(p);
+ // Span<double> doubles = x.Slice<double>(p);
+ //
+ // Requires: `p` is aligned to `Alignment()`.
+ template <class T, class Char>
+ SliceType<CopyConst<Char, T>> Slice(Char* p) const {
+ return Slice<ElementIndex<T>()>(p);
+ }
+
+ // All arrays with known sizes.
+ //
+ // `Char` must be `[const] [signed|unsigned] char`.
+ //
+ // // int[3], 4 bytes of padding, double[4].
+ // Layout<int, double> x(3, 4);
+ // unsigned char* p = new unsigned char[x.AllocSize()];
+ //
+ // Span<int> ints;
+ // Span<double> doubles;
+ // std::tie(ints, doubles) = x.Slices(p);
+ //
+ // Requires: `p` is aligned to `Alignment()`.
+ //
+ // Note: We're not using ElementType alias here because it does not compile
+ // under MSVC.
+ template <class Char>
+ std::tuple<SliceType<CopyConst<
+ Char, typename std::tuple_element<SizeSeq, ElementTypes>::type>>...>
+ Slices(Char* p) const {
+ // Workaround for https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63875 (fixed
+ // in 6.1).
+ (void)p;
+ return std::tuple<SliceType<CopyConst<Char, ElementType<SizeSeq>>>...>(
+ Slice<SizeSeq>(p)...);
+ }
+
+ // The size of the allocation that fits all arrays.
+ //
+ // // int[3], 4 bytes of padding, double[4].
+ // Layout<int, double> x(3, 4);
+ // unsigned char* p = new unsigned char[x.AllocSize()]; // 48 bytes
+ //
+ // Requires: `NumSizes == sizeof...(Ts)`.
+ constexpr size_t AllocSize() const {
+ static_assert(NumTypes == NumSizes, "You must specify sizes of all fields");
+ return Offset<NumTypes - 1>() +
+ SizeOf<ElementType<NumTypes - 1>>() * size_[NumTypes - 1];
+ }
+
+ // If built with --config=asan, poisons padding bytes (if any) in the
+ // allocation. The pointer must point to a memory block at least
+ // `AllocSize()` bytes in length.
+ //
+ // `Char` must be `[const] [signed|unsigned] char`.
+ //
+ // Requires: `p` is aligned to `Alignment()`.
+ template <class Char, size_t N = NumOffsets - 1, EnableIf<N == 0> = 0>
+ void PoisonPadding(const Char* p) const {
+ Pointer<0>(p); // verify the requirements on `Char` and `p`
+ }
+
+ template <class Char, size_t N = NumOffsets - 1, EnableIf<N != 0> = 0>
+ void PoisonPadding(const Char* p) const {
+ static_assert(N < NumOffsets, "Index out of bounds");
+ (void)p;
+#ifdef ABSL_HAVE_ADDRESS_SANITIZER
+ PoisonPadding<Char, N - 1>(p);
+ // The `if` is an optimization. It doesn't affect the observable behaviour.
+ if (ElementAlignment<N - 1>::value % ElementAlignment<N>::value) {
+ size_t start =
+ Offset<N - 1>() + SizeOf<ElementType<N - 1>>() * size_[N - 1];
+ ASAN_POISON_MEMORY_REGION(p + start, Offset<N>() - start);
+ }
+#endif
+ }
+
+ // Human-readable description of the memory layout. Useful for debugging.
+ // Slow.
+ //
+ // // char[5], 3 bytes of padding, int[3], 4 bytes of padding, followed
+ // // by an unknown number of doubles.
+ // auto x = Layout<char, int, double>::Partial(5, 3);
+ // assert(x.DebugString() ==
+ // "@0<char>(1)[5]; @8<int>(4)[3]; @24<double>(8)");
+ //
+ // Each field is in the following format: @offset<type>(sizeof)[size] (<type>
+ // may be missing depending on the target platform). For example,
+ // @8<int>(4)[3] means that at offset 8 we have an array of ints, where each
+ // int is 4 bytes, and we have 3 of those ints. The size of the last field may
+ // be missing (as in the example above). Only fields with known offsets are
+ // described. Type names may differ across platforms: one compiler might
+ // produce "unsigned*" where another produces "unsigned int *".
+ std::string DebugString() const {
+ const auto offsets = Offsets();
+ const size_t sizes[] = {SizeOf<ElementType<OffsetSeq>>()...};
+ const std::string types[] = {
+ adl_barrier::TypeName<ElementType<OffsetSeq>>()...};
+ std::string res = absl::StrCat("@0", types[0], "(", sizes[0], ")");
+ for (size_t i = 0; i != NumOffsets - 1; ++i) {
+ absl::StrAppend(&res, "[", size_[i], "]; @", offsets[i + 1], types[i + 1],
+ "(", sizes[i + 1], ")");
+ }
+ // NumSizes is a constant that may be zero. Some compilers cannot see that
+ // inside the if statement "size_[NumSizes - 1]" must be valid.
+ int last = static_cast<int>(NumSizes) - 1;
+ if (NumTypes == NumSizes && last >= 0) {
+ absl::StrAppend(&res, "[", size_[last], "]");
+ }
+ return res;
+ }
+
+ private:
+ // Arguments of `Layout::Partial()` or `Layout::Layout()`.
+ size_t size_[NumSizes > 0 ? NumSizes : 1];
+};
+
+template <size_t NumSizes, class... Ts>
+using LayoutType = LayoutImpl<
+ std::tuple<Ts...>, absl::make_index_sequence<NumSizes>,
+ absl::make_index_sequence<adl_barrier::Min(sizeof...(Ts), NumSizes + 1)>>;
+
+} // namespace internal_layout
+
+// Descriptor of arrays of various types and sizes laid out in memory one after
+// another. See the top of the file for documentation.
+//
+// Check out the public API of internal_layout::LayoutImpl above. The type is
+// internal to the library but its methods are public, and they are inherited
+// by `Layout`.
+template <class... Ts>
+class Layout : public internal_layout::LayoutType<sizeof...(Ts), Ts...> {
+ public:
+ static_assert(sizeof...(Ts) > 0, "At least one field is required");
+ static_assert(
+ absl::conjunction<internal_layout::IsLegalElementType<Ts>...>::value,
+ "Invalid element type (see IsLegalElementType)");
+
+ // The result type of `Partial()` with `NumSizes` arguments.
+ template <size_t NumSizes>
+ using PartialType = internal_layout::LayoutType<NumSizes, Ts...>;
+
+ // `Layout` knows the element types of the arrays we want to lay out in
+ // memory but not the number of elements in each array.
+ // `Partial(size1, ..., sizeN)` allows us to specify the latter. The
+ // resulting immutable object can be used to obtain pointers to the
+ // individual arrays.
+ //
+ // It's allowed to pass fewer array sizes than the number of arrays. E.g.,
+ // if all you need is to the offset of the second array, you only need to
+ // pass one argument -- the number of elements in the first array.
+ //
+ // // int[3] followed by 4 bytes of padding and an unknown number of
+ // // doubles.
+ // auto x = Layout<int, double>::Partial(3);
+ // // doubles start at byte 16.
+ // assert(x.Offset<1>() == 16);
+ //
+ // If you know the number of elements in all arrays, you can still call
+ // `Partial()` but it's more convenient to use the constructor of `Layout`.
+ //
+ // Layout<int, double> x(3, 5);
+ //
+ // Note: The sizes of the arrays must be specified in number of elements,
+ // not in bytes.
+ //
+ // Requires: `sizeof...(Sizes) <= sizeof...(Ts)`.
+ // Requires: all arguments are convertible to `size_t`.
+ template <class... Sizes>
+ static constexpr PartialType<sizeof...(Sizes)> Partial(Sizes&&... sizes) {
+ static_assert(sizeof...(Sizes) <= sizeof...(Ts), "");
+ return PartialType<sizeof...(Sizes)>(absl::forward<Sizes>(sizes)...);
+ }
+
+ // Creates a layout with the sizes of all arrays specified. If you know
+ // only the sizes of the first N arrays (where N can be zero), you can use
+ // `Partial()` defined above. The constructor is essentially equivalent to
+ // calling `Partial()` and passing in all array sizes; the constructor is
+ // provided as a convenient abbreviation.
+ //
+ // Note: The sizes of the arrays must be specified in number of elements,
+ // not in bytes.
+ constexpr explicit Layout(internal_layout::TypeToSize<Ts>... sizes)
+ : internal_layout::LayoutType<sizeof...(Ts), Ts...>(sizes...) {}
+};
+
+} // namespace container_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_CONTAINER_INTERNAL_LAYOUT_H_
diff --git a/third_party/abseil/src/absl/container/internal/layout_test.cc b/third_party/abseil/src/absl/container/internal/layout_test.cc
new file mode 100644
index 0000000..1d7158f
--- /dev/null
+++ b/third_party/abseil/src/absl/container/internal/layout_test.cc
@@ -0,0 +1,1635 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/container/internal/layout.h"
+
+// We need ::max_align_t because some libstdc++ versions don't provide
+// std::max_align_t
+#include <stddef.h>
+
+#include <cstdint>
+#include <memory>
+#include <sstream>
+#include <type_traits>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/base/config.h"
+#include "absl/base/internal/raw_logging.h"
+#include "absl/types/span.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace container_internal {
+namespace {
+
+using ::absl::Span;
+using ::testing::ElementsAre;
+
+size_t Distance(const void* from, const void* to) {
+ ABSL_RAW_CHECK(from <= to, "Distance must be non-negative");
+ return static_cast<const char*>(to) - static_cast<const char*>(from);
+}
+
+template <class Expected, class Actual>
+Expected Type(Actual val) {
+ static_assert(std::is_same<Expected, Actual>(), "");
+ return val;
+}
+
+// Helper classes to test different size and alignments.
+struct alignas(8) Int128 {
+ uint64_t a, b;
+ friend bool operator==(Int128 lhs, Int128 rhs) {
+ return std::tie(lhs.a, lhs.b) == std::tie(rhs.a, rhs.b);
+ }
+
+ static std::string Name() {
+ return internal_layout::adl_barrier::TypeName<Int128>();
+ }
+};
+
+// int64_t is *not* 8-byte aligned on all platforms!
+struct alignas(8) Int64 {
+ int64_t a;
+ friend bool operator==(Int64 lhs, Int64 rhs) {
+ return lhs.a == rhs.a;
+ }
+};
+
+// Properties of types that this test relies on.
+static_assert(sizeof(int8_t) == 1, "");
+static_assert(alignof(int8_t) == 1, "");
+static_assert(sizeof(int16_t) == 2, "");
+static_assert(alignof(int16_t) == 2, "");
+static_assert(sizeof(int32_t) == 4, "");
+static_assert(alignof(int32_t) == 4, "");
+static_assert(sizeof(Int64) == 8, "");
+static_assert(alignof(Int64) == 8, "");
+static_assert(sizeof(Int128) == 16, "");
+static_assert(alignof(Int128) == 8, "");
+
+template <class Expected, class Actual>
+void SameType() {
+ static_assert(std::is_same<Expected, Actual>(), "");
+}
+
+TEST(Layout, ElementType) {
+ {
+ using L = Layout<int32_t>;
+ SameType<int32_t, L::ElementType<0>>();
+ SameType<int32_t, decltype(L::Partial())::ElementType<0>>();
+ SameType<int32_t, decltype(L::Partial(0))::ElementType<0>>();
+ }
+ {
+ using L = Layout<int32_t, int32_t>;
+ SameType<int32_t, L::ElementType<0>>();
+ SameType<int32_t, L::ElementType<1>>();
+ SameType<int32_t, decltype(L::Partial())::ElementType<0>>();
+ SameType<int32_t, decltype(L::Partial())::ElementType<1>>();
+ SameType<int32_t, decltype(L::Partial(0))::ElementType<0>>();
+ SameType<int32_t, decltype(L::Partial(0))::ElementType<1>>();
+ }
+ {
+ using L = Layout<int8_t, int32_t, Int128>;
+ SameType<int8_t, L::ElementType<0>>();
+ SameType<int32_t, L::ElementType<1>>();
+ SameType<Int128, L::ElementType<2>>();
+ SameType<int8_t, decltype(L::Partial())::ElementType<0>>();
+ SameType<int8_t, decltype(L::Partial(0))::ElementType<0>>();
+ SameType<int32_t, decltype(L::Partial(0))::ElementType<1>>();
+ SameType<int8_t, decltype(L::Partial(0, 0))::ElementType<0>>();
+ SameType<int32_t, decltype(L::Partial(0, 0))::ElementType<1>>();
+ SameType<Int128, decltype(L::Partial(0, 0))::ElementType<2>>();
+ SameType<int8_t, decltype(L::Partial(0, 0, 0))::ElementType<0>>();
+ SameType<int32_t, decltype(L::Partial(0, 0, 0))::ElementType<1>>();
+ SameType<Int128, decltype(L::Partial(0, 0, 0))::ElementType<2>>();
+ }
+}
+
+TEST(Layout, ElementTypes) {
+ {
+ using L = Layout<int32_t>;
+ SameType<std::tuple<int32_t>, L::ElementTypes>();
+ SameType<std::tuple<int32_t>, decltype(L::Partial())::ElementTypes>();
+ SameType<std::tuple<int32_t>, decltype(L::Partial(0))::ElementTypes>();
+ }
+ {
+ using L = Layout<int32_t, int32_t>;
+ SameType<std::tuple<int32_t, int32_t>, L::ElementTypes>();
+ SameType<std::tuple<int32_t, int32_t>,
+ decltype(L::Partial())::ElementTypes>();
+ SameType<std::tuple<int32_t, int32_t>,
+ decltype(L::Partial(0))::ElementTypes>();
+ }
+ {
+ using L = Layout<int8_t, int32_t, Int128>;
+ SameType<std::tuple<int8_t, int32_t, Int128>, L::ElementTypes>();
+ SameType<std::tuple<int8_t, int32_t, Int128>,
+ decltype(L::Partial())::ElementTypes>();
+ SameType<std::tuple<int8_t, int32_t, Int128>,
+ decltype(L::Partial(0))::ElementTypes>();
+ SameType<std::tuple<int8_t, int32_t, Int128>,
+ decltype(L::Partial(0, 0))::ElementTypes>();
+ SameType<std::tuple<int8_t, int32_t, Int128>,
+ decltype(L::Partial(0, 0, 0))::ElementTypes>();
+ }
+}
+
+TEST(Layout, OffsetByIndex) {
+ {
+ using L = Layout<int32_t>;
+ EXPECT_EQ(0, L::Partial().Offset<0>());
+ EXPECT_EQ(0, L::Partial(3).Offset<0>());
+ EXPECT_EQ(0, L(3).Offset<0>());
+ }
+ {
+ using L = Layout<int32_t, int32_t>;
+ EXPECT_EQ(0, L::Partial().Offset<0>());
+ EXPECT_EQ(0, L::Partial(3).Offset<0>());
+ EXPECT_EQ(12, L::Partial(3).Offset<1>());
+ EXPECT_EQ(0, L::Partial(3, 5).Offset<0>());
+ EXPECT_EQ(12, L::Partial(3, 5).Offset<1>());
+ EXPECT_EQ(0, L(3, 5).Offset<0>());
+ EXPECT_EQ(12, L(3, 5).Offset<1>());
+ }
+ {
+ using L = Layout<int8_t, int32_t, Int128>;
+ EXPECT_EQ(0, L::Partial().Offset<0>());
+ EXPECT_EQ(0, L::Partial(0).Offset<0>());
+ EXPECT_EQ(0, L::Partial(0).Offset<1>());
+ EXPECT_EQ(0, L::Partial(1).Offset<0>());
+ EXPECT_EQ(4, L::Partial(1).Offset<1>());
+ EXPECT_EQ(0, L::Partial(5).Offset<0>());
+ EXPECT_EQ(8, L::Partial(5).Offset<1>());
+ EXPECT_EQ(0, L::Partial(0, 0).Offset<0>());
+ EXPECT_EQ(0, L::Partial(0, 0).Offset<1>());
+ EXPECT_EQ(0, L::Partial(0, 0).Offset<2>());
+ EXPECT_EQ(0, L::Partial(1, 0).Offset<0>());
+ EXPECT_EQ(4, L::Partial(1, 0).Offset<1>());
+ EXPECT_EQ(8, L::Partial(1, 0).Offset<2>());
+ EXPECT_EQ(0, L::Partial(5, 3).Offset<0>());
+ EXPECT_EQ(8, L::Partial(5, 3).Offset<1>());
+ EXPECT_EQ(24, L::Partial(5, 3).Offset<2>());
+ EXPECT_EQ(0, L::Partial(0, 0, 0).Offset<0>());
+ EXPECT_EQ(0, L::Partial(0, 0, 0).Offset<1>());
+ EXPECT_EQ(0, L::Partial(0, 0, 0).Offset<2>());
+ EXPECT_EQ(0, L::Partial(1, 0, 0).Offset<0>());
+ EXPECT_EQ(4, L::Partial(1, 0, 0).Offset<1>());
+ EXPECT_EQ(8, L::Partial(1, 0, 0).Offset<2>());
+ EXPECT_EQ(0, L::Partial(5, 3, 1).Offset<0>());
+ EXPECT_EQ(24, L::Partial(5, 3, 1).Offset<2>());
+ EXPECT_EQ(8, L::Partial(5, 3, 1).Offset<1>());
+ EXPECT_EQ(0, L(5, 3, 1).Offset<0>());
+ EXPECT_EQ(24, L(5, 3, 1).Offset<2>());
+ EXPECT_EQ(8, L(5, 3, 1).Offset<1>());
+ }
+}
+
+TEST(Layout, OffsetByType) {
+ {
+ using L = Layout<int32_t>;
+ EXPECT_EQ(0, L::Partial().Offset<int32_t>());
+ EXPECT_EQ(0, L::Partial(3).Offset<int32_t>());
+ EXPECT_EQ(0, L(3).Offset<int32_t>());
+ }
+ {
+ using L = Layout<int8_t, int32_t, Int128>;
+ EXPECT_EQ(0, L::Partial().Offset<int8_t>());
+ EXPECT_EQ(0, L::Partial(0).Offset<int8_t>());
+ EXPECT_EQ(0, L::Partial(0).Offset<int32_t>());
+ EXPECT_EQ(0, L::Partial(1).Offset<int8_t>());
+ EXPECT_EQ(4, L::Partial(1).Offset<int32_t>());
+ EXPECT_EQ(0, L::Partial(5).Offset<int8_t>());
+ EXPECT_EQ(8, L::Partial(5).Offset<int32_t>());
+ EXPECT_EQ(0, L::Partial(0, 0).Offset<int8_t>());
+ EXPECT_EQ(0, L::Partial(0, 0).Offset<int32_t>());
+ EXPECT_EQ(0, L::Partial(0, 0).Offset<Int128>());
+ EXPECT_EQ(0, L::Partial(1, 0).Offset<int8_t>());
+ EXPECT_EQ(4, L::Partial(1, 0).Offset<int32_t>());
+ EXPECT_EQ(8, L::Partial(1, 0).Offset<Int128>());
+ EXPECT_EQ(0, L::Partial(5, 3).Offset<int8_t>());
+ EXPECT_EQ(8, L::Partial(5, 3).Offset<int32_t>());
+ EXPECT_EQ(24, L::Partial(5, 3).Offset<Int128>());
+ EXPECT_EQ(0, L::Partial(0, 0, 0).Offset<int8_t>());
+ EXPECT_EQ(0, L::Partial(0, 0, 0).Offset<int32_t>());
+ EXPECT_EQ(0, L::Partial(0, 0, 0).Offset<Int128>());
+ EXPECT_EQ(0, L::Partial(1, 0, 0).Offset<int8_t>());
+ EXPECT_EQ(4, L::Partial(1, 0, 0).Offset<int32_t>());
+ EXPECT_EQ(8, L::Partial(1, 0, 0).Offset<Int128>());
+ EXPECT_EQ(0, L::Partial(5, 3, 1).Offset<int8_t>());
+ EXPECT_EQ(24, L::Partial(5, 3, 1).Offset<Int128>());
+ EXPECT_EQ(8, L::Partial(5, 3, 1).Offset<int32_t>());
+ EXPECT_EQ(0, L(5, 3, 1).Offset<int8_t>());
+ EXPECT_EQ(24, L(5, 3, 1).Offset<Int128>());
+ EXPECT_EQ(8, L(5, 3, 1).Offset<int32_t>());
+ }
+}
+
+TEST(Layout, Offsets) {
+ {
+ using L = Layout<int32_t>;
+ EXPECT_THAT(L::Partial().Offsets(), ElementsAre(0));
+ EXPECT_THAT(L::Partial(3).Offsets(), ElementsAre(0));
+ EXPECT_THAT(L(3).Offsets(), ElementsAre(0));
+ }
+ {
+ using L = Layout<int32_t, int32_t>;
+ EXPECT_THAT(L::Partial().Offsets(), ElementsAre(0));
+ EXPECT_THAT(L::Partial(3).Offsets(), ElementsAre(0, 12));
+ EXPECT_THAT(L::Partial(3, 5).Offsets(), ElementsAre(0, 12));
+ EXPECT_THAT(L(3, 5).Offsets(), ElementsAre(0, 12));
+ }
+ {
+ using L = Layout<int8_t, int32_t, Int128>;
+ EXPECT_THAT(L::Partial().Offsets(), ElementsAre(0));
+ EXPECT_THAT(L::Partial(1).Offsets(), ElementsAre(0, 4));
+ EXPECT_THAT(L::Partial(5).Offsets(), ElementsAre(0, 8));
+ EXPECT_THAT(L::Partial(0, 0).Offsets(), ElementsAre(0, 0, 0));
+ EXPECT_THAT(L::Partial(1, 0).Offsets(), ElementsAre(0, 4, 8));
+ EXPECT_THAT(L::Partial(5, 3).Offsets(), ElementsAre(0, 8, 24));
+ EXPECT_THAT(L::Partial(0, 0, 0).Offsets(), ElementsAre(0, 0, 0));
+ EXPECT_THAT(L::Partial(1, 0, 0).Offsets(), ElementsAre(0, 4, 8));
+ EXPECT_THAT(L::Partial(5, 3, 1).Offsets(), ElementsAre(0, 8, 24));
+ EXPECT_THAT(L(5, 3, 1).Offsets(), ElementsAre(0, 8, 24));
+ }
+}
+
+TEST(Layout, AllocSize) {
+ {
+ using L = Layout<int32_t>;
+ EXPECT_EQ(0, L::Partial(0).AllocSize());
+ EXPECT_EQ(12, L::Partial(3).AllocSize());
+ EXPECT_EQ(12, L(3).AllocSize());
+ }
+ {
+ using L = Layout<int32_t, int32_t>;
+ EXPECT_EQ(32, L::Partial(3, 5).AllocSize());
+ EXPECT_EQ(32, L(3, 5).AllocSize());
+ }
+ {
+ using L = Layout<int8_t, int32_t, Int128>;
+ EXPECT_EQ(0, L::Partial(0, 0, 0).AllocSize());
+ EXPECT_EQ(8, L::Partial(1, 0, 0).AllocSize());
+ EXPECT_EQ(8, L::Partial(0, 1, 0).AllocSize());
+ EXPECT_EQ(16, L::Partial(0, 0, 1).AllocSize());
+ EXPECT_EQ(24, L::Partial(1, 1, 1).AllocSize());
+ EXPECT_EQ(136, L::Partial(3, 5, 7).AllocSize());
+ EXPECT_EQ(136, L(3, 5, 7).AllocSize());
+ }
+}
+
+TEST(Layout, SizeByIndex) {
+ {
+ using L = Layout<int32_t>;
+ EXPECT_EQ(0, L::Partial(0).Size<0>());
+ EXPECT_EQ(3, L::Partial(3).Size<0>());
+ EXPECT_EQ(3, L(3).Size<0>());
+ }
+ {
+ using L = Layout<int32_t, int32_t>;
+ EXPECT_EQ(0, L::Partial(0).Size<0>());
+ EXPECT_EQ(3, L::Partial(3).Size<0>());
+ EXPECT_EQ(3, L::Partial(3, 5).Size<0>());
+ EXPECT_EQ(5, L::Partial(3, 5).Size<1>());
+ EXPECT_EQ(3, L(3, 5).Size<0>());
+ EXPECT_EQ(5, L(3, 5).Size<1>());
+ }
+ {
+ using L = Layout<int8_t, int32_t, Int128>;
+ EXPECT_EQ(3, L::Partial(3).Size<0>());
+ EXPECT_EQ(3, L::Partial(3, 5).Size<0>());
+ EXPECT_EQ(5, L::Partial(3, 5).Size<1>());
+ EXPECT_EQ(3, L::Partial(3, 5, 7).Size<0>());
+ EXPECT_EQ(5, L::Partial(3, 5, 7).Size<1>());
+ EXPECT_EQ(7, L::Partial(3, 5, 7).Size<2>());
+ EXPECT_EQ(3, L(3, 5, 7).Size<0>());
+ EXPECT_EQ(5, L(3, 5, 7).Size<1>());
+ EXPECT_EQ(7, L(3, 5, 7).Size<2>());
+ }
+}
+
+TEST(Layout, SizeByType) {
+ {
+ using L = Layout<int32_t>;
+ EXPECT_EQ(0, L::Partial(0).Size<int32_t>());
+ EXPECT_EQ(3, L::Partial(3).Size<int32_t>());
+ EXPECT_EQ(3, L(3).Size<int32_t>());
+ }
+ {
+ using L = Layout<int8_t, int32_t, Int128>;
+ EXPECT_EQ(3, L::Partial(3).Size<int8_t>());
+ EXPECT_EQ(3, L::Partial(3, 5).Size<int8_t>());
+ EXPECT_EQ(5, L::Partial(3, 5).Size<int32_t>());
+ EXPECT_EQ(3, L::Partial(3, 5, 7).Size<int8_t>());
+ EXPECT_EQ(5, L::Partial(3, 5, 7).Size<int32_t>());
+ EXPECT_EQ(7, L::Partial(3, 5, 7).Size<Int128>());
+ EXPECT_EQ(3, L(3, 5, 7).Size<int8_t>());
+ EXPECT_EQ(5, L(3, 5, 7).Size<int32_t>());
+ EXPECT_EQ(7, L(3, 5, 7).Size<Int128>());
+ }
+}
+
+TEST(Layout, Sizes) {
+ {
+ using L = Layout<int32_t>;
+ EXPECT_THAT(L::Partial().Sizes(), ElementsAre());
+ EXPECT_THAT(L::Partial(3).Sizes(), ElementsAre(3));
+ EXPECT_THAT(L(3).Sizes(), ElementsAre(3));
+ }
+ {
+ using L = Layout<int32_t, int32_t>;
+ EXPECT_THAT(L::Partial().Sizes(), ElementsAre());
+ EXPECT_THAT(L::Partial(3).Sizes(), ElementsAre(3));
+ EXPECT_THAT(L::Partial(3, 5).Sizes(), ElementsAre(3, 5));
+ EXPECT_THAT(L(3, 5).Sizes(), ElementsAre(3, 5));
+ }
+ {
+ using L = Layout<int8_t, int32_t, Int128>;
+ EXPECT_THAT(L::Partial().Sizes(), ElementsAre());
+ EXPECT_THAT(L::Partial(3).Sizes(), ElementsAre(3));
+ EXPECT_THAT(L::Partial(3, 5).Sizes(), ElementsAre(3, 5));
+ EXPECT_THAT(L::Partial(3, 5, 7).Sizes(), ElementsAre(3, 5, 7));
+ EXPECT_THAT(L(3, 5, 7).Sizes(), ElementsAre(3, 5, 7));
+ }
+}
+
+TEST(Layout, PointerByIndex) {
+ alignas(max_align_t) const unsigned char p[100] = {};
+ {
+ using L = Layout<int32_t>;
+ EXPECT_EQ(0, Distance(p, Type<const int32_t*>(L::Partial().Pointer<0>(p))));
+ EXPECT_EQ(0,
+ Distance(p, Type<const int32_t*>(L::Partial(3).Pointer<0>(p))));
+ EXPECT_EQ(0, Distance(p, Type<const int32_t*>(L(3).Pointer<0>(p))));
+ }
+ {
+ using L = Layout<int32_t, int32_t>;
+ EXPECT_EQ(0, Distance(p, Type<const int32_t*>(L::Partial().Pointer<0>(p))));
+ EXPECT_EQ(0,
+ Distance(p, Type<const int32_t*>(L::Partial(3).Pointer<0>(p))));
+ EXPECT_EQ(12,
+ Distance(p, Type<const int32_t*>(L::Partial(3).Pointer<1>(p))));
+ EXPECT_EQ(
+ 0, Distance(p, Type<const int32_t*>(L::Partial(3, 5).Pointer<0>(p))));
+ EXPECT_EQ(
+ 12, Distance(p, Type<const int32_t*>(L::Partial(3, 5).Pointer<1>(p))));
+ EXPECT_EQ(0, Distance(p, Type<const int32_t*>(L(3, 5).Pointer<0>(p))));
+ EXPECT_EQ(12, Distance(p, Type<const int32_t*>(L(3, 5).Pointer<1>(p))));
+ }
+ {
+ using L = Layout<int8_t, int32_t, Int128>;
+ EXPECT_EQ(0, Distance(p, Type<const int8_t*>(L::Partial().Pointer<0>(p))));
+ EXPECT_EQ(0, Distance(p, Type<const int8_t*>(L::Partial(0).Pointer<0>(p))));
+ EXPECT_EQ(0,
+ Distance(p, Type<const int32_t*>(L::Partial(0).Pointer<1>(p))));
+ EXPECT_EQ(0, Distance(p, Type<const int8_t*>(L::Partial(1).Pointer<0>(p))));
+ EXPECT_EQ(4,
+ Distance(p, Type<const int32_t*>(L::Partial(1).Pointer<1>(p))));
+ EXPECT_EQ(0, Distance(p, Type<const int8_t*>(L::Partial(5).Pointer<0>(p))));
+ EXPECT_EQ(8,
+ Distance(p, Type<const int32_t*>(L::Partial(5).Pointer<1>(p))));
+ EXPECT_EQ(0,
+ Distance(p, Type<const int8_t*>(L::Partial(0, 0).Pointer<0>(p))));
+ EXPECT_EQ(
+ 0, Distance(p, Type<const int32_t*>(L::Partial(0, 0).Pointer<1>(p))));
+ EXPECT_EQ(0,
+ Distance(p, Type<const Int128*>(L::Partial(0, 0).Pointer<2>(p))));
+ EXPECT_EQ(0,
+ Distance(p, Type<const int8_t*>(L::Partial(1, 0).Pointer<0>(p))));
+ EXPECT_EQ(
+ 4, Distance(p, Type<const int32_t*>(L::Partial(1, 0).Pointer<1>(p))));
+ EXPECT_EQ(8,
+ Distance(p, Type<const Int128*>(L::Partial(1, 0).Pointer<2>(p))));
+ EXPECT_EQ(0,
+ Distance(p, Type<const int8_t*>(L::Partial(5, 3).Pointer<0>(p))));
+ EXPECT_EQ(
+ 8, Distance(p, Type<const int32_t*>(L::Partial(5, 3).Pointer<1>(p))));
+ EXPECT_EQ(24,
+ Distance(p, Type<const Int128*>(L::Partial(5, 3).Pointer<2>(p))));
+ EXPECT_EQ(
+ 0, Distance(p, Type<const int8_t*>(L::Partial(0, 0, 0).Pointer<0>(p))));
+ EXPECT_EQ(
+ 0,
+ Distance(p, Type<const int32_t*>(L::Partial(0, 0, 0).Pointer<1>(p))));
+ EXPECT_EQ(
+ 0, Distance(p, Type<const Int128*>(L::Partial(0, 0, 0).Pointer<2>(p))));
+ EXPECT_EQ(
+ 0, Distance(p, Type<const int8_t*>(L::Partial(1, 0, 0).Pointer<0>(p))));
+ EXPECT_EQ(
+ 4,
+ Distance(p, Type<const int32_t*>(L::Partial(1, 0, 0).Pointer<1>(p))));
+ EXPECT_EQ(
+ 8, Distance(p, Type<const Int128*>(L::Partial(1, 0, 0).Pointer<2>(p))));
+ EXPECT_EQ(
+ 0, Distance(p, Type<const int8_t*>(L::Partial(5, 3, 1).Pointer<0>(p))));
+ EXPECT_EQ(
+ 24,
+ Distance(p, Type<const Int128*>(L::Partial(5, 3, 1).Pointer<2>(p))));
+ EXPECT_EQ(
+ 8,
+ Distance(p, Type<const int32_t*>(L::Partial(5, 3, 1).Pointer<1>(p))));
+ EXPECT_EQ(0, Distance(p, Type<const int8_t*>(L(5, 3, 1).Pointer<0>(p))));
+ EXPECT_EQ(24, Distance(p, Type<const Int128*>(L(5, 3, 1).Pointer<2>(p))));
+ EXPECT_EQ(8, Distance(p, Type<const int32_t*>(L(5, 3, 1).Pointer<1>(p))));
+ }
+}
+
+TEST(Layout, PointerByType) {
+ alignas(max_align_t) const unsigned char p[100] = {};
+ {
+ using L = Layout<int32_t>;
+ EXPECT_EQ(
+ 0, Distance(p, Type<const int32_t*>(L::Partial().Pointer<int32_t>(p))));
+ EXPECT_EQ(
+ 0,
+ Distance(p, Type<const int32_t*>(L::Partial(3).Pointer<int32_t>(p))));
+ EXPECT_EQ(0, Distance(p, Type<const int32_t*>(L(3).Pointer<int32_t>(p))));
+ }
+ {
+ using L = Layout<int8_t, int32_t, Int128>;
+ EXPECT_EQ(
+ 0, Distance(p, Type<const int8_t*>(L::Partial().Pointer<int8_t>(p))));
+ EXPECT_EQ(
+ 0, Distance(p, Type<const int8_t*>(L::Partial(0).Pointer<int8_t>(p))));
+ EXPECT_EQ(
+ 0,
+ Distance(p, Type<const int32_t*>(L::Partial(0).Pointer<int32_t>(p))));
+ EXPECT_EQ(
+ 0, Distance(p, Type<const int8_t*>(L::Partial(1).Pointer<int8_t>(p))));
+ EXPECT_EQ(
+ 4,
+ Distance(p, Type<const int32_t*>(L::Partial(1).Pointer<int32_t>(p))));
+ EXPECT_EQ(
+ 0, Distance(p, Type<const int8_t*>(L::Partial(5).Pointer<int8_t>(p))));
+ EXPECT_EQ(
+ 8,
+ Distance(p, Type<const int32_t*>(L::Partial(5).Pointer<int32_t>(p))));
+ EXPECT_EQ(
+ 0,
+ Distance(p, Type<const int8_t*>(L::Partial(0, 0).Pointer<int8_t>(p))));
+ EXPECT_EQ(0, Distance(p, Type<const int32_t*>(
+ L::Partial(0, 0).Pointer<int32_t>(p))));
+ EXPECT_EQ(
+ 0,
+ Distance(p, Type<const Int128*>(L::Partial(0, 0).Pointer<Int128>(p))));
+ EXPECT_EQ(
+ 0,
+ Distance(p, Type<const int8_t*>(L::Partial(1, 0).Pointer<int8_t>(p))));
+ EXPECT_EQ(4, Distance(p, Type<const int32_t*>(
+ L::Partial(1, 0).Pointer<int32_t>(p))));
+ EXPECT_EQ(
+ 8,
+ Distance(p, Type<const Int128*>(L::Partial(1, 0).Pointer<Int128>(p))));
+ EXPECT_EQ(
+ 0,
+ Distance(p, Type<const int8_t*>(L::Partial(5, 3).Pointer<int8_t>(p))));
+ EXPECT_EQ(8, Distance(p, Type<const int32_t*>(
+ L::Partial(5, 3).Pointer<int32_t>(p))));
+ EXPECT_EQ(
+ 24,
+ Distance(p, Type<const Int128*>(L::Partial(5, 3).Pointer<Int128>(p))));
+ EXPECT_EQ(0, Distance(p, Type<const int8_t*>(
+ L::Partial(0, 0, 0).Pointer<int8_t>(p))));
+ EXPECT_EQ(0, Distance(p, Type<const int32_t*>(
+ L::Partial(0, 0, 0).Pointer<int32_t>(p))));
+ EXPECT_EQ(0, Distance(p, Type<const Int128*>(
+ L::Partial(0, 0, 0).Pointer<Int128>(p))));
+ EXPECT_EQ(0, Distance(p, Type<const int8_t*>(
+ L::Partial(1, 0, 0).Pointer<int8_t>(p))));
+ EXPECT_EQ(4, Distance(p, Type<const int32_t*>(
+ L::Partial(1, 0, 0).Pointer<int32_t>(p))));
+ EXPECT_EQ(8, Distance(p, Type<const Int128*>(
+ L::Partial(1, 0, 0).Pointer<Int128>(p))));
+ EXPECT_EQ(0, Distance(p, Type<const int8_t*>(
+ L::Partial(5, 3, 1).Pointer<int8_t>(p))));
+ EXPECT_EQ(24, Distance(p, Type<const Int128*>(
+ L::Partial(5, 3, 1).Pointer<Int128>(p))));
+ EXPECT_EQ(8, Distance(p, Type<const int32_t*>(
+ L::Partial(5, 3, 1).Pointer<int32_t>(p))));
+ EXPECT_EQ(24,
+ Distance(p, Type<const Int128*>(L(5, 3, 1).Pointer<Int128>(p))));
+ EXPECT_EQ(
+ 8, Distance(p, Type<const int32_t*>(L(5, 3, 1).Pointer<int32_t>(p))));
+ }
+}
+
+TEST(Layout, MutablePointerByIndex) {
+ alignas(max_align_t) unsigned char p[100];
+ {
+ using L = Layout<int32_t>;
+ EXPECT_EQ(0, Distance(p, Type<int32_t*>(L::Partial().Pointer<0>(p))));
+ EXPECT_EQ(0, Distance(p, Type<int32_t*>(L::Partial(3).Pointer<0>(p))));
+ EXPECT_EQ(0, Distance(p, Type<int32_t*>(L(3).Pointer<0>(p))));
+ }
+ {
+ using L = Layout<int32_t, int32_t>;
+ EXPECT_EQ(0, Distance(p, Type<int32_t*>(L::Partial().Pointer<0>(p))));
+ EXPECT_EQ(0, Distance(p, Type<int32_t*>(L::Partial(3).Pointer<0>(p))));
+ EXPECT_EQ(12, Distance(p, Type<int32_t*>(L::Partial(3).Pointer<1>(p))));
+ EXPECT_EQ(0, Distance(p, Type<int32_t*>(L::Partial(3, 5).Pointer<0>(p))));
+ EXPECT_EQ(12, Distance(p, Type<int32_t*>(L::Partial(3, 5).Pointer<1>(p))));
+ EXPECT_EQ(0, Distance(p, Type<int32_t*>(L(3, 5).Pointer<0>(p))));
+ EXPECT_EQ(12, Distance(p, Type<int32_t*>(L(3, 5).Pointer<1>(p))));
+ }
+ {
+ using L = Layout<int8_t, int32_t, Int128>;
+ EXPECT_EQ(0, Distance(p, Type<int8_t*>(L::Partial().Pointer<0>(p))));
+ EXPECT_EQ(0, Distance(p, Type<int8_t*>(L::Partial(0).Pointer<0>(p))));
+ EXPECT_EQ(0, Distance(p, Type<int32_t*>(L::Partial(0).Pointer<1>(p))));
+ EXPECT_EQ(0, Distance(p, Type<int8_t*>(L::Partial(1).Pointer<0>(p))));
+ EXPECT_EQ(4, Distance(p, Type<int32_t*>(L::Partial(1).Pointer<1>(p))));
+ EXPECT_EQ(0, Distance(p, Type<int8_t*>(L::Partial(5).Pointer<0>(p))));
+ EXPECT_EQ(8, Distance(p, Type<int32_t*>(L::Partial(5).Pointer<1>(p))));
+ EXPECT_EQ(0, Distance(p, Type<int8_t*>(L::Partial(0, 0).Pointer<0>(p))));
+ EXPECT_EQ(0, Distance(p, Type<int32_t*>(L::Partial(0, 0).Pointer<1>(p))));
+ EXPECT_EQ(0, Distance(p, Type<Int128*>(L::Partial(0, 0).Pointer<2>(p))));
+ EXPECT_EQ(0, Distance(p, Type<int8_t*>(L::Partial(1, 0).Pointer<0>(p))));
+ EXPECT_EQ(4, Distance(p, Type<int32_t*>(L::Partial(1, 0).Pointer<1>(p))));
+ EXPECT_EQ(8, Distance(p, Type<Int128*>(L::Partial(1, 0).Pointer<2>(p))));
+ EXPECT_EQ(0, Distance(p, Type<int8_t*>(L::Partial(5, 3).Pointer<0>(p))));
+ EXPECT_EQ(8, Distance(p, Type<int32_t*>(L::Partial(5, 3).Pointer<1>(p))));
+ EXPECT_EQ(24, Distance(p, Type<Int128*>(L::Partial(5, 3).Pointer<2>(p))));
+ EXPECT_EQ(0, Distance(p, Type<int8_t*>(L::Partial(0, 0, 0).Pointer<0>(p))));
+ EXPECT_EQ(0,
+ Distance(p, Type<int32_t*>(L::Partial(0, 0, 0).Pointer<1>(p))));
+ EXPECT_EQ(0, Distance(p, Type<Int128*>(L::Partial(0, 0, 0).Pointer<2>(p))));
+ EXPECT_EQ(0, Distance(p, Type<int8_t*>(L::Partial(1, 0, 0).Pointer<0>(p))));
+ EXPECT_EQ(4,
+ Distance(p, Type<int32_t*>(L::Partial(1, 0, 0).Pointer<1>(p))));
+ EXPECT_EQ(8, Distance(p, Type<Int128*>(L::Partial(1, 0, 0).Pointer<2>(p))));
+ EXPECT_EQ(0, Distance(p, Type<int8_t*>(L::Partial(5, 3, 1).Pointer<0>(p))));
+ EXPECT_EQ(24,
+ Distance(p, Type<Int128*>(L::Partial(5, 3, 1).Pointer<2>(p))));
+ EXPECT_EQ(8,
+ Distance(p, Type<int32_t*>(L::Partial(5, 3, 1).Pointer<1>(p))));
+ EXPECT_EQ(0, Distance(p, Type<int8_t*>(L(5, 3, 1).Pointer<0>(p))));
+ EXPECT_EQ(24, Distance(p, Type<Int128*>(L(5, 3, 1).Pointer<2>(p))));
+ EXPECT_EQ(8, Distance(p, Type<int32_t*>(L(5, 3, 1).Pointer<1>(p))));
+ }
+}
+
+TEST(Layout, MutablePointerByType) {
+ alignas(max_align_t) unsigned char p[100];
+ {
+ using L = Layout<int32_t>;
+ EXPECT_EQ(0, Distance(p, Type<int32_t*>(L::Partial().Pointer<int32_t>(p))));
+ EXPECT_EQ(0,
+ Distance(p, Type<int32_t*>(L::Partial(3).Pointer<int32_t>(p))));
+ EXPECT_EQ(0, Distance(p, Type<int32_t*>(L(3).Pointer<int32_t>(p))));
+ }
+ {
+ using L = Layout<int8_t, int32_t, Int128>;
+ EXPECT_EQ(0, Distance(p, Type<int8_t*>(L::Partial().Pointer<int8_t>(p))));
+ EXPECT_EQ(0, Distance(p, Type<int8_t*>(L::Partial(0).Pointer<int8_t>(p))));
+ EXPECT_EQ(0,
+ Distance(p, Type<int32_t*>(L::Partial(0).Pointer<int32_t>(p))));
+ EXPECT_EQ(0, Distance(p, Type<int8_t*>(L::Partial(1).Pointer<int8_t>(p))));
+ EXPECT_EQ(4,
+ Distance(p, Type<int32_t*>(L::Partial(1).Pointer<int32_t>(p))));
+ EXPECT_EQ(0, Distance(p, Type<int8_t*>(L::Partial(5).Pointer<int8_t>(p))));
+ EXPECT_EQ(8,
+ Distance(p, Type<int32_t*>(L::Partial(5).Pointer<int32_t>(p))));
+ EXPECT_EQ(0,
+ Distance(p, Type<int8_t*>(L::Partial(0, 0).Pointer<int8_t>(p))));
+ EXPECT_EQ(
+ 0, Distance(p, Type<int32_t*>(L::Partial(0, 0).Pointer<int32_t>(p))));
+ EXPECT_EQ(0,
+ Distance(p, Type<Int128*>(L::Partial(0, 0).Pointer<Int128>(p))));
+ EXPECT_EQ(0,
+ Distance(p, Type<int8_t*>(L::Partial(1, 0).Pointer<int8_t>(p))));
+ EXPECT_EQ(
+ 4, Distance(p, Type<int32_t*>(L::Partial(1, 0).Pointer<int32_t>(p))));
+ EXPECT_EQ(8,
+ Distance(p, Type<Int128*>(L::Partial(1, 0).Pointer<Int128>(p))));
+ EXPECT_EQ(0,
+ Distance(p, Type<int8_t*>(L::Partial(5, 3).Pointer<int8_t>(p))));
+ EXPECT_EQ(
+ 8, Distance(p, Type<int32_t*>(L::Partial(5, 3).Pointer<int32_t>(p))));
+ EXPECT_EQ(24,
+ Distance(p, Type<Int128*>(L::Partial(5, 3).Pointer<Int128>(p))));
+ EXPECT_EQ(
+ 0, Distance(p, Type<int8_t*>(L::Partial(0, 0, 0).Pointer<int8_t>(p))));
+ EXPECT_EQ(
+ 0,
+ Distance(p, Type<int32_t*>(L::Partial(0, 0, 0).Pointer<int32_t>(p))));
+ EXPECT_EQ(
+ 0, Distance(p, Type<Int128*>(L::Partial(0, 0, 0).Pointer<Int128>(p))));
+ EXPECT_EQ(
+ 0, Distance(p, Type<int8_t*>(L::Partial(1, 0, 0).Pointer<int8_t>(p))));
+ EXPECT_EQ(
+ 4,
+ Distance(p, Type<int32_t*>(L::Partial(1, 0, 0).Pointer<int32_t>(p))));
+ EXPECT_EQ(
+ 8, Distance(p, Type<Int128*>(L::Partial(1, 0, 0).Pointer<Int128>(p))));
+ EXPECT_EQ(
+ 0, Distance(p, Type<int8_t*>(L::Partial(5, 3, 1).Pointer<int8_t>(p))));
+ EXPECT_EQ(
+ 24, Distance(p, Type<Int128*>(L::Partial(5, 3, 1).Pointer<Int128>(p))));
+ EXPECT_EQ(
+ 8,
+ Distance(p, Type<int32_t*>(L::Partial(5, 3, 1).Pointer<int32_t>(p))));
+ EXPECT_EQ(0, Distance(p, Type<int8_t*>(L(5, 3, 1).Pointer<int8_t>(p))));
+ EXPECT_EQ(24, Distance(p, Type<Int128*>(L(5, 3, 1).Pointer<Int128>(p))));
+ EXPECT_EQ(8, Distance(p, Type<int32_t*>(L(5, 3, 1).Pointer<int32_t>(p))));
+ }
+}
+
+TEST(Layout, Pointers) {
+ alignas(max_align_t) const unsigned char p[100] = {};
+ using L = Layout<int8_t, int8_t, Int128>;
+ {
+ const auto x = L::Partial();
+ EXPECT_EQ(std::make_tuple(x.Pointer<0>(p)),
+ Type<std::tuple<const int8_t*>>(x.Pointers(p)));
+ }
+ {
+ const auto x = L::Partial(1);
+ EXPECT_EQ(std::make_tuple(x.Pointer<0>(p), x.Pointer<1>(p)),
+ (Type<std::tuple<const int8_t*, const int8_t*>>(x.Pointers(p))));
+ }
+ {
+ const auto x = L::Partial(1, 2);
+ EXPECT_EQ(
+ std::make_tuple(x.Pointer<0>(p), x.Pointer<1>(p), x.Pointer<2>(p)),
+ (Type<std::tuple<const int8_t*, const int8_t*, const Int128*>>(
+ x.Pointers(p))));
+ }
+ {
+ const auto x = L::Partial(1, 2, 3);
+ EXPECT_EQ(
+ std::make_tuple(x.Pointer<0>(p), x.Pointer<1>(p), x.Pointer<2>(p)),
+ (Type<std::tuple<const int8_t*, const int8_t*, const Int128*>>(
+ x.Pointers(p))));
+ }
+ {
+ const L x(1, 2, 3);
+ EXPECT_EQ(
+ std::make_tuple(x.Pointer<0>(p), x.Pointer<1>(p), x.Pointer<2>(p)),
+ (Type<std::tuple<const int8_t*, const int8_t*, const Int128*>>(
+ x.Pointers(p))));
+ }
+}
+
+TEST(Layout, MutablePointers) {
+ alignas(max_align_t) unsigned char p[100];
+ using L = Layout<int8_t, int8_t, Int128>;
+ {
+ const auto x = L::Partial();
+ EXPECT_EQ(std::make_tuple(x.Pointer<0>(p)),
+ Type<std::tuple<int8_t*>>(x.Pointers(p)));
+ }
+ {
+ const auto x = L::Partial(1);
+ EXPECT_EQ(std::make_tuple(x.Pointer<0>(p), x.Pointer<1>(p)),
+ (Type<std::tuple<int8_t*, int8_t*>>(x.Pointers(p))));
+ }
+ {
+ const auto x = L::Partial(1, 2);
+ EXPECT_EQ(
+ std::make_tuple(x.Pointer<0>(p), x.Pointer<1>(p), x.Pointer<2>(p)),
+ (Type<std::tuple<int8_t*, int8_t*, Int128*>>(x.Pointers(p))));
+ }
+ {
+ const auto x = L::Partial(1, 2, 3);
+ EXPECT_EQ(
+ std::make_tuple(x.Pointer<0>(p), x.Pointer<1>(p), x.Pointer<2>(p)),
+ (Type<std::tuple<int8_t*, int8_t*, Int128*>>(x.Pointers(p))));
+ }
+ {
+ const L x(1, 2, 3);
+ EXPECT_EQ(
+ std::make_tuple(x.Pointer<0>(p), x.Pointer<1>(p), x.Pointer<2>(p)),
+ (Type<std::tuple<int8_t*, int8_t*, Int128*>>(x.Pointers(p))));
+ }
+}
+
+TEST(Layout, SliceByIndexSize) {
+ alignas(max_align_t) const unsigned char p[100] = {};
+ {
+ using L = Layout<int32_t>;
+ EXPECT_EQ(0, L::Partial(0).Slice<0>(p).size());
+ EXPECT_EQ(3, L::Partial(3).Slice<0>(p).size());
+ EXPECT_EQ(3, L(3).Slice<0>(p).size());
+ }
+ {
+ using L = Layout<int32_t, int32_t>;
+ EXPECT_EQ(3, L::Partial(3).Slice<0>(p).size());
+ EXPECT_EQ(5, L::Partial(3, 5).Slice<1>(p).size());
+ EXPECT_EQ(5, L(3, 5).Slice<1>(p).size());
+ }
+ {
+ using L = Layout<int8_t, int32_t, Int128>;
+ EXPECT_EQ(3, L::Partial(3).Slice<0>(p).size());
+ EXPECT_EQ(3, L::Partial(3, 5).Slice<0>(p).size());
+ EXPECT_EQ(5, L::Partial(3, 5).Slice<1>(p).size());
+ EXPECT_EQ(3, L::Partial(3, 5, 7).Slice<0>(p).size());
+ EXPECT_EQ(5, L::Partial(3, 5, 7).Slice<1>(p).size());
+ EXPECT_EQ(7, L::Partial(3, 5, 7).Slice<2>(p).size());
+ EXPECT_EQ(3, L(3, 5, 7).Slice<0>(p).size());
+ EXPECT_EQ(5, L(3, 5, 7).Slice<1>(p).size());
+ EXPECT_EQ(7, L(3, 5, 7).Slice<2>(p).size());
+ }
+}
+
+TEST(Layout, SliceByTypeSize) {
+ alignas(max_align_t) const unsigned char p[100] = {};
+ {
+ using L = Layout<int32_t>;
+ EXPECT_EQ(0, L::Partial(0).Slice<int32_t>(p).size());
+ EXPECT_EQ(3, L::Partial(3).Slice<int32_t>(p).size());
+ EXPECT_EQ(3, L(3).Slice<int32_t>(p).size());
+ }
+ {
+ using L = Layout<int8_t, int32_t, Int128>;
+ EXPECT_EQ(3, L::Partial(3).Slice<int8_t>(p).size());
+ EXPECT_EQ(3, L::Partial(3, 5).Slice<int8_t>(p).size());
+ EXPECT_EQ(5, L::Partial(3, 5).Slice<int32_t>(p).size());
+ EXPECT_EQ(3, L::Partial(3, 5, 7).Slice<int8_t>(p).size());
+ EXPECT_EQ(5, L::Partial(3, 5, 7).Slice<int32_t>(p).size());
+ EXPECT_EQ(7, L::Partial(3, 5, 7).Slice<Int128>(p).size());
+ EXPECT_EQ(3, L(3, 5, 7).Slice<int8_t>(p).size());
+ EXPECT_EQ(5, L(3, 5, 7).Slice<int32_t>(p).size());
+ EXPECT_EQ(7, L(3, 5, 7).Slice<Int128>(p).size());
+ }
+}
+
+TEST(Layout, MutableSliceByIndexSize) {
+ alignas(max_align_t) unsigned char p[100];
+ {
+ using L = Layout<int32_t>;
+ EXPECT_EQ(0, L::Partial(0).Slice<0>(p).size());
+ EXPECT_EQ(3, L::Partial(3).Slice<0>(p).size());
+ EXPECT_EQ(3, L(3).Slice<0>(p).size());
+ }
+ {
+ using L = Layout<int32_t, int32_t>;
+ EXPECT_EQ(3, L::Partial(3).Slice<0>(p).size());
+ EXPECT_EQ(5, L::Partial(3, 5).Slice<1>(p).size());
+ EXPECT_EQ(5, L(3, 5).Slice<1>(p).size());
+ }
+ {
+ using L = Layout<int8_t, int32_t, Int128>;
+ EXPECT_EQ(3, L::Partial(3).Slice<0>(p).size());
+ EXPECT_EQ(3, L::Partial(3, 5).Slice<0>(p).size());
+ EXPECT_EQ(5, L::Partial(3, 5).Slice<1>(p).size());
+ EXPECT_EQ(3, L::Partial(3, 5, 7).Slice<0>(p).size());
+ EXPECT_EQ(5, L::Partial(3, 5, 7).Slice<1>(p).size());
+ EXPECT_EQ(7, L::Partial(3, 5, 7).Slice<2>(p).size());
+ EXPECT_EQ(3, L(3, 5, 7).Slice<0>(p).size());
+ EXPECT_EQ(5, L(3, 5, 7).Slice<1>(p).size());
+ EXPECT_EQ(7, L(3, 5, 7).Slice<2>(p).size());
+ }
+}
+
+TEST(Layout, MutableSliceByTypeSize) {
+ alignas(max_align_t) unsigned char p[100];
+ {
+ using L = Layout<int32_t>;
+ EXPECT_EQ(0, L::Partial(0).Slice<int32_t>(p).size());
+ EXPECT_EQ(3, L::Partial(3).Slice<int32_t>(p).size());
+ EXPECT_EQ(3, L(3).Slice<int32_t>(p).size());
+ }
+ {
+ using L = Layout<int8_t, int32_t, Int128>;
+ EXPECT_EQ(3, L::Partial(3).Slice<int8_t>(p).size());
+ EXPECT_EQ(3, L::Partial(3, 5).Slice<int8_t>(p).size());
+ EXPECT_EQ(5, L::Partial(3, 5).Slice<int32_t>(p).size());
+ EXPECT_EQ(3, L::Partial(3, 5, 7).Slice<int8_t>(p).size());
+ EXPECT_EQ(5, L::Partial(3, 5, 7).Slice<int32_t>(p).size());
+ EXPECT_EQ(7, L::Partial(3, 5, 7).Slice<Int128>(p).size());
+ EXPECT_EQ(3, L(3, 5, 7).Slice<int8_t>(p).size());
+ EXPECT_EQ(5, L(3, 5, 7).Slice<int32_t>(p).size());
+ EXPECT_EQ(7, L(3, 5, 7).Slice<Int128>(p).size());
+ }
+}
+
+TEST(Layout, SliceByIndexData) {
+ alignas(max_align_t) const unsigned char p[100] = {};
+ {
+ using L = Layout<int32_t>;
+ EXPECT_EQ(
+ 0, Distance(
+ p, Type<Span<const int32_t>>(L::Partial(0).Slice<0>(p)).data()));
+ EXPECT_EQ(
+ 0, Distance(
+ p, Type<Span<const int32_t>>(L::Partial(3).Slice<0>(p)).data()));
+ EXPECT_EQ(0,
+ Distance(p, Type<Span<const int32_t>>(L(3).Slice<0>(p)).data()));
+ }
+ {
+ using L = Layout<int32_t, int32_t>;
+ EXPECT_EQ(
+ 0, Distance(
+ p, Type<Span<const int32_t>>(L::Partial(3).Slice<0>(p)).data()));
+ EXPECT_EQ(
+ 0,
+ Distance(
+ p, Type<Span<const int32_t>>(L::Partial(3, 5).Slice<0>(p)).data()));
+ EXPECT_EQ(
+ 12,
+ Distance(
+ p, Type<Span<const int32_t>>(L::Partial(3, 5).Slice<1>(p)).data()));
+ EXPECT_EQ(
+ 0, Distance(p, Type<Span<const int32_t>>(L(3, 5).Slice<0>(p)).data()));
+ EXPECT_EQ(
+ 12, Distance(p, Type<Span<const int32_t>>(L(3, 5).Slice<1>(p)).data()));
+ }
+ {
+ using L = Layout<int8_t, int32_t, Int128>;
+ EXPECT_EQ(
+ 0, Distance(
+ p, Type<Span<const int8_t>>(L::Partial(0).Slice<0>(p)).data()));
+ EXPECT_EQ(
+ 0, Distance(
+ p, Type<Span<const int8_t>>(L::Partial(1).Slice<0>(p)).data()));
+ EXPECT_EQ(
+ 0, Distance(
+ p, Type<Span<const int8_t>>(L::Partial(5).Slice<0>(p)).data()));
+ EXPECT_EQ(
+ 0,
+ Distance(
+ p, Type<Span<const int8_t>>(L::Partial(0, 0).Slice<0>(p)).data()));
+ EXPECT_EQ(
+ 0,
+ Distance(
+ p, Type<Span<const int32_t>>(L::Partial(0, 0).Slice<1>(p)).data()));
+ EXPECT_EQ(
+ 0,
+ Distance(
+ p, Type<Span<const int8_t>>(L::Partial(1, 0).Slice<0>(p)).data()));
+ EXPECT_EQ(
+ 4,
+ Distance(
+ p, Type<Span<const int32_t>>(L::Partial(1, 0).Slice<1>(p)).data()));
+ EXPECT_EQ(
+ 0,
+ Distance(
+ p, Type<Span<const int8_t>>(L::Partial(5, 3).Slice<0>(p)).data()));
+ EXPECT_EQ(
+ 8,
+ Distance(
+ p, Type<Span<const int32_t>>(L::Partial(5, 3).Slice<1>(p)).data()));
+ EXPECT_EQ(
+ 0,
+ Distance(
+ p,
+ Type<Span<const int8_t>>(L::Partial(0, 0, 0).Slice<0>(p)).data()));
+ EXPECT_EQ(
+ 0,
+ Distance(
+ p,
+ Type<Span<const int32_t>>(L::Partial(0, 0, 0).Slice<1>(p)).data()));
+ EXPECT_EQ(
+ 0,
+ Distance(
+ p,
+ Type<Span<const Int128>>(L::Partial(0, 0, 0).Slice<2>(p)).data()));
+ EXPECT_EQ(
+ 0,
+ Distance(
+ p,
+ Type<Span<const int8_t>>(L::Partial(1, 0, 0).Slice<0>(p)).data()));
+ EXPECT_EQ(
+ 4,
+ Distance(
+ p,
+ Type<Span<const int32_t>>(L::Partial(1, 0, 0).Slice<1>(p)).data()));
+ EXPECT_EQ(
+ 8,
+ Distance(
+ p,
+ Type<Span<const Int128>>(L::Partial(1, 0, 0).Slice<2>(p)).data()));
+ EXPECT_EQ(
+ 0,
+ Distance(
+ p,
+ Type<Span<const int8_t>>(L::Partial(5, 3, 1).Slice<0>(p)).data()));
+ EXPECT_EQ(
+ 24,
+ Distance(
+ p,
+ Type<Span<const Int128>>(L::Partial(5, 3, 1).Slice<2>(p)).data()));
+ EXPECT_EQ(
+ 8,
+ Distance(
+ p,
+ Type<Span<const int32_t>>(L::Partial(5, 3, 1).Slice<1>(p)).data()));
+ EXPECT_EQ(
+ 0,
+ Distance(p, Type<Span<const int8_t>>(L(5, 3, 1).Slice<0>(p)).data()));
+ EXPECT_EQ(
+ 24,
+ Distance(p, Type<Span<const Int128>>(L(5, 3, 1).Slice<2>(p)).data()));
+ EXPECT_EQ(
+ 8,
+ Distance(p, Type<Span<const int32_t>>(L(5, 3, 1).Slice<1>(p)).data()));
+ }
+}
+
+TEST(Layout, SliceByTypeData) {
+ alignas(max_align_t) const unsigned char p[100] = {};
+ {
+ using L = Layout<int32_t>;
+ EXPECT_EQ(
+ 0,
+ Distance(
+ p,
+ Type<Span<const int32_t>>(L::Partial(0).Slice<int32_t>(p)).data()));
+ EXPECT_EQ(
+ 0,
+ Distance(
+ p,
+ Type<Span<const int32_t>>(L::Partial(3).Slice<int32_t>(p)).data()));
+ EXPECT_EQ(
+ 0,
+ Distance(p, Type<Span<const int32_t>>(L(3).Slice<int32_t>(p)).data()));
+ }
+ {
+ using L = Layout<int8_t, int32_t, Int128>;
+ EXPECT_EQ(
+ 0,
+ Distance(
+ p,
+ Type<Span<const int8_t>>(L::Partial(0).Slice<int8_t>(p)).data()));
+ EXPECT_EQ(
+ 0,
+ Distance(
+ p,
+ Type<Span<const int8_t>>(L::Partial(1).Slice<int8_t>(p)).data()));
+ EXPECT_EQ(
+ 0,
+ Distance(
+ p,
+ Type<Span<const int8_t>>(L::Partial(5).Slice<int8_t>(p)).data()));
+ EXPECT_EQ(
+ 0,
+ Distance(p, Type<Span<const int8_t>>(L::Partial(0, 0).Slice<int8_t>(p))
+ .data()));
+ EXPECT_EQ(0, Distance(p, Type<Span<const int32_t>>(
+ L::Partial(0, 0).Slice<int32_t>(p))
+ .data()));
+ EXPECT_EQ(
+ 0,
+ Distance(p, Type<Span<const int8_t>>(L::Partial(1, 0).Slice<int8_t>(p))
+ .data()));
+ EXPECT_EQ(4, Distance(p, Type<Span<const int32_t>>(
+ L::Partial(1, 0).Slice<int32_t>(p))
+ .data()));
+ EXPECT_EQ(
+ 0,
+ Distance(p, Type<Span<const int8_t>>(L::Partial(5, 3).Slice<int8_t>(p))
+ .data()));
+ EXPECT_EQ(8, Distance(p, Type<Span<const int32_t>>(
+ L::Partial(5, 3).Slice<int32_t>(p))
+ .data()));
+ EXPECT_EQ(0, Distance(p, Type<Span<const int8_t>>(
+ L::Partial(0, 0, 0).Slice<int8_t>(p))
+ .data()));
+ EXPECT_EQ(0, Distance(p, Type<Span<const int32_t>>(
+ L::Partial(0, 0, 0).Slice<int32_t>(p))
+ .data()));
+ EXPECT_EQ(0, Distance(p, Type<Span<const Int128>>(
+ L::Partial(0, 0, 0).Slice<Int128>(p))
+ .data()));
+ EXPECT_EQ(0, Distance(p, Type<Span<const int8_t>>(
+ L::Partial(1, 0, 0).Slice<int8_t>(p))
+ .data()));
+ EXPECT_EQ(4, Distance(p, Type<Span<const int32_t>>(
+ L::Partial(1, 0, 0).Slice<int32_t>(p))
+ .data()));
+ EXPECT_EQ(8, Distance(p, Type<Span<const Int128>>(
+ L::Partial(1, 0, 0).Slice<Int128>(p))
+ .data()));
+ EXPECT_EQ(0, Distance(p, Type<Span<const int8_t>>(
+ L::Partial(5, 3, 1).Slice<int8_t>(p))
+ .data()));
+ EXPECT_EQ(24, Distance(p, Type<Span<const Int128>>(
+ L::Partial(5, 3, 1).Slice<Int128>(p))
+ .data()));
+ EXPECT_EQ(8, Distance(p, Type<Span<const int32_t>>(
+ L::Partial(5, 3, 1).Slice<int32_t>(p))
+ .data()));
+ EXPECT_EQ(
+ 0,
+ Distance(p,
+ Type<Span<const int8_t>>(L(5, 3, 1).Slice<int8_t>(p)).data()));
+ EXPECT_EQ(
+ 24,
+ Distance(p,
+ Type<Span<const Int128>>(L(5, 3, 1).Slice<Int128>(p)).data()));
+ EXPECT_EQ(
+ 8,
+ Distance(
+ p, Type<Span<const int32_t>>(L(5, 3, 1).Slice<int32_t>(p)).data()));
+ }
+}
+
+TEST(Layout, MutableSliceByIndexData) {
+ alignas(max_align_t) unsigned char p[100];
+ {
+ using L = Layout<int32_t>;
+ EXPECT_EQ(
+ 0, Distance(p, Type<Span<int32_t>>(L::Partial(0).Slice<0>(p)).data()));
+ EXPECT_EQ(
+ 0, Distance(p, Type<Span<int32_t>>(L::Partial(3).Slice<0>(p)).data()));
+ EXPECT_EQ(0, Distance(p, Type<Span<int32_t>>(L(3).Slice<0>(p)).data()));
+ }
+ {
+ using L = Layout<int32_t, int32_t>;
+ EXPECT_EQ(
+ 0, Distance(p, Type<Span<int32_t>>(L::Partial(3).Slice<0>(p)).data()));
+ EXPECT_EQ(
+ 0,
+ Distance(p, Type<Span<int32_t>>(L::Partial(3, 5).Slice<0>(p)).data()));
+ EXPECT_EQ(
+ 12,
+ Distance(p, Type<Span<int32_t>>(L::Partial(3, 5).Slice<1>(p)).data()));
+ EXPECT_EQ(0, Distance(p, Type<Span<int32_t>>(L(3, 5).Slice<0>(p)).data()));
+ EXPECT_EQ(12, Distance(p, Type<Span<int32_t>>(L(3, 5).Slice<1>(p)).data()));
+ }
+ {
+ using L = Layout<int8_t, int32_t, Int128>;
+ EXPECT_EQ(
+ 0, Distance(p, Type<Span<int8_t>>(L::Partial(0).Slice<0>(p)).data()));
+ EXPECT_EQ(
+ 0, Distance(p, Type<Span<int8_t>>(L::Partial(1).Slice<0>(p)).data()));
+ EXPECT_EQ(
+ 0, Distance(p, Type<Span<int8_t>>(L::Partial(5).Slice<0>(p)).data()));
+ EXPECT_EQ(
+ 0,
+ Distance(p, Type<Span<int8_t>>(L::Partial(0, 0).Slice<0>(p)).data()));
+ EXPECT_EQ(
+ 0,
+ Distance(p, Type<Span<int32_t>>(L::Partial(0, 0).Slice<1>(p)).data()));
+ EXPECT_EQ(
+ 0,
+ Distance(p, Type<Span<int8_t>>(L::Partial(1, 0).Slice<0>(p)).data()));
+ EXPECT_EQ(
+ 4,
+ Distance(p, Type<Span<int32_t>>(L::Partial(1, 0).Slice<1>(p)).data()));
+ EXPECT_EQ(
+ 0,
+ Distance(p, Type<Span<int8_t>>(L::Partial(5, 3).Slice<0>(p)).data()));
+ EXPECT_EQ(
+ 8,
+ Distance(p, Type<Span<int32_t>>(L::Partial(5, 3).Slice<1>(p)).data()));
+ EXPECT_EQ(
+ 0, Distance(
+ p, Type<Span<int8_t>>(L::Partial(0, 0, 0).Slice<0>(p)).data()));
+ EXPECT_EQ(
+ 0, Distance(
+ p, Type<Span<int32_t>>(L::Partial(0, 0, 0).Slice<1>(p)).data()));
+ EXPECT_EQ(
+ 0, Distance(
+ p, Type<Span<Int128>>(L::Partial(0, 0, 0).Slice<2>(p)).data()));
+ EXPECT_EQ(
+ 0, Distance(
+ p, Type<Span<int8_t>>(L::Partial(1, 0, 0).Slice<0>(p)).data()));
+ EXPECT_EQ(
+ 4, Distance(
+ p, Type<Span<int32_t>>(L::Partial(1, 0, 0).Slice<1>(p)).data()));
+ EXPECT_EQ(
+ 8, Distance(
+ p, Type<Span<Int128>>(L::Partial(1, 0, 0).Slice<2>(p)).data()));
+ EXPECT_EQ(
+ 0, Distance(
+ p, Type<Span<int8_t>>(L::Partial(5, 3, 1).Slice<0>(p)).data()));
+ EXPECT_EQ(
+ 24, Distance(
+ p, Type<Span<Int128>>(L::Partial(5, 3, 1).Slice<2>(p)).data()));
+ EXPECT_EQ(
+ 8, Distance(
+ p, Type<Span<int32_t>>(L::Partial(5, 3, 1).Slice<1>(p)).data()));
+ EXPECT_EQ(0,
+ Distance(p, Type<Span<int8_t>>(L(5, 3, 1).Slice<0>(p)).data()));
+ EXPECT_EQ(24,
+ Distance(p, Type<Span<Int128>>(L(5, 3, 1).Slice<2>(p)).data()));
+ EXPECT_EQ(8,
+ Distance(p, Type<Span<int32_t>>(L(5, 3, 1).Slice<1>(p)).data()));
+ }
+}
+
+TEST(Layout, MutableSliceByTypeData) {
+ alignas(max_align_t) unsigned char p[100];
+ {
+ using L = Layout<int32_t>;
+ EXPECT_EQ(
+ 0, Distance(
+ p, Type<Span<int32_t>>(L::Partial(0).Slice<int32_t>(p)).data()));
+ EXPECT_EQ(
+ 0, Distance(
+ p, Type<Span<int32_t>>(L::Partial(3).Slice<int32_t>(p)).data()));
+ EXPECT_EQ(0,
+ Distance(p, Type<Span<int32_t>>(L(3).Slice<int32_t>(p)).data()));
+ }
+ {
+ using L = Layout<int8_t, int32_t, Int128>;
+ EXPECT_EQ(
+ 0,
+ Distance(p, Type<Span<int8_t>>(L::Partial(0).Slice<int8_t>(p)).data()));
+ EXPECT_EQ(
+ 0,
+ Distance(p, Type<Span<int8_t>>(L::Partial(1).Slice<int8_t>(p)).data()));
+ EXPECT_EQ(
+ 0,
+ Distance(p, Type<Span<int8_t>>(L::Partial(5).Slice<int8_t>(p)).data()));
+ EXPECT_EQ(
+ 0,
+ Distance(p,
+ Type<Span<int8_t>>(L::Partial(0, 0).Slice<int8_t>(p)).data()));
+ EXPECT_EQ(
+ 0,
+ Distance(
+ p, Type<Span<int32_t>>(L::Partial(0, 0).Slice<int32_t>(p)).data()));
+ EXPECT_EQ(
+ 0,
+ Distance(p,
+ Type<Span<int8_t>>(L::Partial(1, 0).Slice<int8_t>(p)).data()));
+ EXPECT_EQ(
+ 4,
+ Distance(
+ p, Type<Span<int32_t>>(L::Partial(1, 0).Slice<int32_t>(p)).data()));
+ EXPECT_EQ(
+ 0,
+ Distance(p,
+ Type<Span<int8_t>>(L::Partial(5, 3).Slice<int8_t>(p)).data()));
+ EXPECT_EQ(
+ 8,
+ Distance(
+ p, Type<Span<int32_t>>(L::Partial(5, 3).Slice<int32_t>(p)).data()));
+ EXPECT_EQ(
+ 0,
+ Distance(
+ p,
+ Type<Span<int8_t>>(L::Partial(0, 0, 0).Slice<int8_t>(p)).data()));
+ EXPECT_EQ(
+ 0,
+ Distance(
+ p,
+ Type<Span<int32_t>>(L::Partial(0, 0, 0).Slice<int32_t>(p)).data()));
+ EXPECT_EQ(
+ 0,
+ Distance(
+ p,
+ Type<Span<Int128>>(L::Partial(0, 0, 0).Slice<Int128>(p)).data()));
+ EXPECT_EQ(
+ 0,
+ Distance(
+ p,
+ Type<Span<int8_t>>(L::Partial(1, 0, 0).Slice<int8_t>(p)).data()));
+ EXPECT_EQ(
+ 4,
+ Distance(
+ p,
+ Type<Span<int32_t>>(L::Partial(1, 0, 0).Slice<int32_t>(p)).data()));
+ EXPECT_EQ(
+ 8,
+ Distance(
+ p,
+ Type<Span<Int128>>(L::Partial(1, 0, 0).Slice<Int128>(p)).data()));
+ EXPECT_EQ(
+ 0,
+ Distance(
+ p,
+ Type<Span<int8_t>>(L::Partial(5, 3, 1).Slice<int8_t>(p)).data()));
+ EXPECT_EQ(
+ 24,
+ Distance(
+ p,
+ Type<Span<Int128>>(L::Partial(5, 3, 1).Slice<Int128>(p)).data()));
+ EXPECT_EQ(
+ 8,
+ Distance(
+ p,
+ Type<Span<int32_t>>(L::Partial(5, 3, 1).Slice<int32_t>(p)).data()));
+ EXPECT_EQ(
+ 0, Distance(p, Type<Span<int8_t>>(L(5, 3, 1).Slice<int8_t>(p)).data()));
+ EXPECT_EQ(
+ 24,
+ Distance(p, Type<Span<Int128>>(L(5, 3, 1).Slice<Int128>(p)).data()));
+ EXPECT_EQ(
+ 8,
+ Distance(p, Type<Span<int32_t>>(L(5, 3, 1).Slice<int32_t>(p)).data()));
+ }
+}
+
+MATCHER_P(IsSameSlice, slice, "") {
+ return arg.size() == slice.size() && arg.data() == slice.data();
+}
+
+template <typename... M>
+class TupleMatcher {
+ public:
+ explicit TupleMatcher(M... matchers) : matchers_(std::move(matchers)...) {}
+
+ template <typename Tuple>
+ bool MatchAndExplain(const Tuple& p,
+ testing::MatchResultListener* /* listener */) const {
+ static_assert(std::tuple_size<Tuple>::value == sizeof...(M), "");
+ return MatchAndExplainImpl(
+ p, absl::make_index_sequence<std::tuple_size<Tuple>::value>{});
+ }
+
+ // For the matcher concept. Left empty as we don't really need the diagnostics
+ // right now.
+ void DescribeTo(::std::ostream* os) const {}
+ void DescribeNegationTo(::std::ostream* os) const {}
+
+ private:
+ template <typename Tuple, size_t... Is>
+ bool MatchAndExplainImpl(const Tuple& p, absl::index_sequence<Is...>) const {
+ // Using std::min as a simple variadic "and".
+ return std::min(
+ {true, testing::SafeMatcherCast<
+ const typename std::tuple_element<Is, Tuple>::type&>(
+ std::get<Is>(matchers_))
+ .Matches(std::get<Is>(p))...});
+ }
+
+ std::tuple<M...> matchers_;
+};
+
+template <typename... M>
+testing::PolymorphicMatcher<TupleMatcher<M...>> Tuple(M... matchers) {
+ return testing::MakePolymorphicMatcher(
+ TupleMatcher<M...>(std::move(matchers)...));
+}
+
+TEST(Layout, Slices) {
+ alignas(max_align_t) const unsigned char p[100] = {};
+ using L = Layout<int8_t, int8_t, Int128>;
+ {
+ const auto x = L::Partial();
+ EXPECT_THAT(Type<std::tuple<>>(x.Slices(p)), Tuple());
+ }
+ {
+ const auto x = L::Partial(1);
+ EXPECT_THAT(Type<std::tuple<Span<const int8_t>>>(x.Slices(p)),
+ Tuple(IsSameSlice(x.Slice<0>(p))));
+ }
+ {
+ const auto x = L::Partial(1, 2);
+ EXPECT_THAT(
+ (Type<std::tuple<Span<const int8_t>, Span<const int8_t>>>(x.Slices(p))),
+ Tuple(IsSameSlice(x.Slice<0>(p)), IsSameSlice(x.Slice<1>(p))));
+ }
+ {
+ const auto x = L::Partial(1, 2, 3);
+ EXPECT_THAT((Type<std::tuple<Span<const int8_t>, Span<const int8_t>,
+ Span<const Int128>>>(x.Slices(p))),
+ Tuple(IsSameSlice(x.Slice<0>(p)), IsSameSlice(x.Slice<1>(p)),
+ IsSameSlice(x.Slice<2>(p))));
+ }
+ {
+ const L x(1, 2, 3);
+ EXPECT_THAT((Type<std::tuple<Span<const int8_t>, Span<const int8_t>,
+ Span<const Int128>>>(x.Slices(p))),
+ Tuple(IsSameSlice(x.Slice<0>(p)), IsSameSlice(x.Slice<1>(p)),
+ IsSameSlice(x.Slice<2>(p))));
+ }
+}
+
+TEST(Layout, MutableSlices) {
+ alignas(max_align_t) unsigned char p[100] = {};
+ using L = Layout<int8_t, int8_t, Int128>;
+ {
+ const auto x = L::Partial();
+ EXPECT_THAT(Type<std::tuple<>>(x.Slices(p)), Tuple());
+ }
+ {
+ const auto x = L::Partial(1);
+ EXPECT_THAT(Type<std::tuple<Span<int8_t>>>(x.Slices(p)),
+ Tuple(IsSameSlice(x.Slice<0>(p))));
+ }
+ {
+ const auto x = L::Partial(1, 2);
+ EXPECT_THAT((Type<std::tuple<Span<int8_t>, Span<int8_t>>>(x.Slices(p))),
+ Tuple(IsSameSlice(x.Slice<0>(p)), IsSameSlice(x.Slice<1>(p))));
+ }
+ {
+ const auto x = L::Partial(1, 2, 3);
+ EXPECT_THAT((Type<std::tuple<Span<int8_t>, Span<int8_t>, Span<Int128>>>(
+ x.Slices(p))),
+ Tuple(IsSameSlice(x.Slice<0>(p)), IsSameSlice(x.Slice<1>(p)),
+ IsSameSlice(x.Slice<2>(p))));
+ }
+ {
+ const L x(1, 2, 3);
+ EXPECT_THAT((Type<std::tuple<Span<int8_t>, Span<int8_t>, Span<Int128>>>(
+ x.Slices(p))),
+ Tuple(IsSameSlice(x.Slice<0>(p)), IsSameSlice(x.Slice<1>(p)),
+ IsSameSlice(x.Slice<2>(p))));
+ }
+}
+
+TEST(Layout, UnalignedTypes) {
+ constexpr Layout<unsigned char, unsigned char, unsigned char> x(1, 2, 3);
+ alignas(max_align_t) unsigned char p[x.AllocSize() + 1];
+ EXPECT_THAT(x.Pointers(p + 1), Tuple(p + 1, p + 2, p + 4));
+}
+
+TEST(Layout, CustomAlignment) {
+ constexpr Layout<unsigned char, Aligned<unsigned char, 8>> x(1, 2);
+ alignas(max_align_t) unsigned char p[x.AllocSize()];
+ EXPECT_EQ(10, x.AllocSize());
+ EXPECT_THAT(x.Pointers(p), Tuple(p + 0, p + 8));
+}
+
+TEST(Layout, OverAligned) {
+ constexpr size_t M = alignof(max_align_t);
+ constexpr Layout<unsigned char, Aligned<unsigned char, 2 * M>> x(1, 3);
+ alignas(2 * M) unsigned char p[x.AllocSize()];
+ EXPECT_EQ(2 * M + 3, x.AllocSize());
+ EXPECT_THAT(x.Pointers(p), Tuple(p + 0, p + 2 * M));
+}
+
+TEST(Layout, Alignment) {
+ static_assert(Layout<int8_t>::Alignment() == 1, "");
+ static_assert(Layout<int32_t>::Alignment() == 4, "");
+ static_assert(Layout<Int64>::Alignment() == 8, "");
+ static_assert(Layout<Aligned<int8_t, 64>>::Alignment() == 64, "");
+ static_assert(Layout<int8_t, int32_t, Int64>::Alignment() == 8, "");
+ static_assert(Layout<int8_t, Int64, int32_t>::Alignment() == 8, "");
+ static_assert(Layout<int32_t, int8_t, Int64>::Alignment() == 8, "");
+ static_assert(Layout<int32_t, Int64, int8_t>::Alignment() == 8, "");
+ static_assert(Layout<Int64, int8_t, int32_t>::Alignment() == 8, "");
+ static_assert(Layout<Int64, int32_t, int8_t>::Alignment() == 8, "");
+}
+
+TEST(Layout, ConstexprPartial) {
+ constexpr size_t M = alignof(max_align_t);
+ constexpr Layout<unsigned char, Aligned<unsigned char, 2 * M>> x(1, 3);
+ static_assert(x.Partial(1).template Offset<1>() == 2 * M, "");
+}
+// [from, to)
+struct Region {
+ size_t from;
+ size_t to;
+};
+
+void ExpectRegionPoisoned(const unsigned char* p, size_t n, bool poisoned) {
+#ifdef ABSL_HAVE_ADDRESS_SANITIZER
+ for (size_t i = 0; i != n; ++i) {
+ EXPECT_EQ(poisoned, __asan_address_is_poisoned(p + i));
+ }
+#endif
+}
+
+template <size_t N>
+void ExpectPoisoned(const unsigned char (&buf)[N],
+ std::initializer_list<Region> reg) {
+ size_t prev = 0;
+ for (const Region& r : reg) {
+ ExpectRegionPoisoned(buf + prev, r.from - prev, false);
+ ExpectRegionPoisoned(buf + r.from, r.to - r.from, true);
+ prev = r.to;
+ }
+ ExpectRegionPoisoned(buf + prev, N - prev, false);
+}
+
+TEST(Layout, PoisonPadding) {
+ using L = Layout<int8_t, Int64, int32_t, Int128>;
+
+ constexpr size_t n = L::Partial(1, 2, 3, 4).AllocSize();
+ {
+ constexpr auto x = L::Partial();
+ alignas(max_align_t) const unsigned char c[n] = {};
+ x.PoisonPadding(c);
+ EXPECT_EQ(x.Slices(c), x.Slices(c));
+ ExpectPoisoned(c, {});
+ }
+ {
+ constexpr auto x = L::Partial(1);
+ alignas(max_align_t) const unsigned char c[n] = {};
+ x.PoisonPadding(c);
+ EXPECT_EQ(x.Slices(c), x.Slices(c));
+ ExpectPoisoned(c, {{1, 8}});
+ }
+ {
+ constexpr auto x = L::Partial(1, 2);
+ alignas(max_align_t) const unsigned char c[n] = {};
+ x.PoisonPadding(c);
+ EXPECT_EQ(x.Slices(c), x.Slices(c));
+ ExpectPoisoned(c, {{1, 8}});
+ }
+ {
+ constexpr auto x = L::Partial(1, 2, 3);
+ alignas(max_align_t) const unsigned char c[n] = {};
+ x.PoisonPadding(c);
+ EXPECT_EQ(x.Slices(c), x.Slices(c));
+ ExpectPoisoned(c, {{1, 8}, {36, 40}});
+ }
+ {
+ constexpr auto x = L::Partial(1, 2, 3, 4);
+ alignas(max_align_t) const unsigned char c[n] = {};
+ x.PoisonPadding(c);
+ EXPECT_EQ(x.Slices(c), x.Slices(c));
+ ExpectPoisoned(c, {{1, 8}, {36, 40}});
+ }
+ {
+ constexpr L x(1, 2, 3, 4);
+ alignas(max_align_t) const unsigned char c[n] = {};
+ x.PoisonPadding(c);
+ EXPECT_EQ(x.Slices(c), x.Slices(c));
+ ExpectPoisoned(c, {{1, 8}, {36, 40}});
+ }
+}
+
+TEST(Layout, DebugString) {
+ {
+ constexpr auto x = Layout<int8_t, int32_t, int8_t, Int128>::Partial();
+ EXPECT_EQ("@0<signed char>(1)", x.DebugString());
+ }
+ {
+ constexpr auto x = Layout<int8_t, int32_t, int8_t, Int128>::Partial(1);
+ EXPECT_EQ("@0<signed char>(1)[1]; @4<int>(4)", x.DebugString());
+ }
+ {
+ constexpr auto x = Layout<int8_t, int32_t, int8_t, Int128>::Partial(1, 2);
+ EXPECT_EQ("@0<signed char>(1)[1]; @4<int>(4)[2]; @12<signed char>(1)",
+ x.DebugString());
+ }
+ {
+ constexpr auto x =
+ Layout<int8_t, int32_t, int8_t, Int128>::Partial(1, 2, 3);
+ EXPECT_EQ(
+ "@0<signed char>(1)[1]; @4<int>(4)[2]; @12<signed char>(1)[3]; "
+ "@16" +
+ Int128::Name() + "(16)",
+ x.DebugString());
+ }
+ {
+ constexpr auto x =
+ Layout<int8_t, int32_t, int8_t, Int128>::Partial(1, 2, 3, 4);
+ EXPECT_EQ(
+ "@0<signed char>(1)[1]; @4<int>(4)[2]; @12<signed char>(1)[3]; "
+ "@16" +
+ Int128::Name() + "(16)[4]",
+ x.DebugString());
+ }
+ {
+ constexpr Layout<int8_t, int32_t, int8_t, Int128> x(1, 2, 3, 4);
+ EXPECT_EQ(
+ "@0<signed char>(1)[1]; @4<int>(4)[2]; @12<signed char>(1)[3]; "
+ "@16" +
+ Int128::Name() + "(16)[4]",
+ x.DebugString());
+ }
+}
+
+TEST(Layout, CharTypes) {
+ constexpr Layout<int32_t> x(1);
+ alignas(max_align_t) char c[x.AllocSize()] = {};
+ alignas(max_align_t) unsigned char uc[x.AllocSize()] = {};
+ alignas(max_align_t) signed char sc[x.AllocSize()] = {};
+ alignas(max_align_t) const char cc[x.AllocSize()] = {};
+ alignas(max_align_t) const unsigned char cuc[x.AllocSize()] = {};
+ alignas(max_align_t) const signed char csc[x.AllocSize()] = {};
+
+ Type<int32_t*>(x.Pointer<0>(c));
+ Type<int32_t*>(x.Pointer<0>(uc));
+ Type<int32_t*>(x.Pointer<0>(sc));
+ Type<const int32_t*>(x.Pointer<0>(cc));
+ Type<const int32_t*>(x.Pointer<0>(cuc));
+ Type<const int32_t*>(x.Pointer<0>(csc));
+
+ Type<int32_t*>(x.Pointer<int32_t>(c));
+ Type<int32_t*>(x.Pointer<int32_t>(uc));
+ Type<int32_t*>(x.Pointer<int32_t>(sc));
+ Type<const int32_t*>(x.Pointer<int32_t>(cc));
+ Type<const int32_t*>(x.Pointer<int32_t>(cuc));
+ Type<const int32_t*>(x.Pointer<int32_t>(csc));
+
+ Type<std::tuple<int32_t*>>(x.Pointers(c));
+ Type<std::tuple<int32_t*>>(x.Pointers(uc));
+ Type<std::tuple<int32_t*>>(x.Pointers(sc));
+ Type<std::tuple<const int32_t*>>(x.Pointers(cc));
+ Type<std::tuple<const int32_t*>>(x.Pointers(cuc));
+ Type<std::tuple<const int32_t*>>(x.Pointers(csc));
+
+ Type<Span<int32_t>>(x.Slice<0>(c));
+ Type<Span<int32_t>>(x.Slice<0>(uc));
+ Type<Span<int32_t>>(x.Slice<0>(sc));
+ Type<Span<const int32_t>>(x.Slice<0>(cc));
+ Type<Span<const int32_t>>(x.Slice<0>(cuc));
+ Type<Span<const int32_t>>(x.Slice<0>(csc));
+
+ Type<std::tuple<Span<int32_t>>>(x.Slices(c));
+ Type<std::tuple<Span<int32_t>>>(x.Slices(uc));
+ Type<std::tuple<Span<int32_t>>>(x.Slices(sc));
+ Type<std::tuple<Span<const int32_t>>>(x.Slices(cc));
+ Type<std::tuple<Span<const int32_t>>>(x.Slices(cuc));
+ Type<std::tuple<Span<const int32_t>>>(x.Slices(csc));
+}
+
+TEST(Layout, ConstElementType) {
+ constexpr Layout<const int32_t> x(1);
+ alignas(int32_t) char c[x.AllocSize()] = {};
+ const char* cc = c;
+ const int32_t* p = reinterpret_cast<const int32_t*>(cc);
+
+ EXPECT_EQ(alignof(int32_t), x.Alignment());
+
+ EXPECT_EQ(0, x.Offset<0>());
+ EXPECT_EQ(0, x.Offset<const int32_t>());
+
+ EXPECT_THAT(x.Offsets(), ElementsAre(0));
+
+ EXPECT_EQ(1, x.Size<0>());
+ EXPECT_EQ(1, x.Size<const int32_t>());
+
+ EXPECT_THAT(x.Sizes(), ElementsAre(1));
+
+ EXPECT_EQ(sizeof(int32_t), x.AllocSize());
+
+ EXPECT_EQ(p, Type<const int32_t*>(x.Pointer<0>(c)));
+ EXPECT_EQ(p, Type<const int32_t*>(x.Pointer<0>(cc)));
+
+ EXPECT_EQ(p, Type<const int32_t*>(x.Pointer<const int32_t>(c)));
+ EXPECT_EQ(p, Type<const int32_t*>(x.Pointer<const int32_t>(cc)));
+
+ EXPECT_THAT(Type<std::tuple<const int32_t*>>(x.Pointers(c)), Tuple(p));
+ EXPECT_THAT(Type<std::tuple<const int32_t*>>(x.Pointers(cc)), Tuple(p));
+
+ EXPECT_THAT(Type<Span<const int32_t>>(x.Slice<0>(c)),
+ IsSameSlice(Span<const int32_t>(p, 1)));
+ EXPECT_THAT(Type<Span<const int32_t>>(x.Slice<0>(cc)),
+ IsSameSlice(Span<const int32_t>(p, 1)));
+
+ EXPECT_THAT(Type<Span<const int32_t>>(x.Slice<const int32_t>(c)),
+ IsSameSlice(Span<const int32_t>(p, 1)));
+ EXPECT_THAT(Type<Span<const int32_t>>(x.Slice<const int32_t>(cc)),
+ IsSameSlice(Span<const int32_t>(p, 1)));
+
+ EXPECT_THAT(Type<std::tuple<Span<const int32_t>>>(x.Slices(c)),
+ Tuple(IsSameSlice(Span<const int32_t>(p, 1))));
+ EXPECT_THAT(Type<std::tuple<Span<const int32_t>>>(x.Slices(cc)),
+ Tuple(IsSameSlice(Span<const int32_t>(p, 1))));
+}
+
+namespace example {
+
+// Immutable move-only string with sizeof equal to sizeof(void*). The string
+// size and the characters are kept in the same heap allocation.
+class CompactString {
+ public:
+ CompactString(const char* s = "") { // NOLINT
+ const size_t size = strlen(s);
+ // size_t[1], followed by char[size + 1].
+ // This statement doesn't allocate memory.
+ const L layout(1, size + 1);
+ // AllocSize() tells us how much memory we need to allocate for all our
+ // data.
+ p_.reset(new unsigned char[layout.AllocSize()]);
+ // If running under ASAN, mark the padding bytes, if any, to catch memory
+ // errors.
+ layout.PoisonPadding(p_.get());
+ // Store the size in the allocation.
+ // Pointer<size_t>() is a synonym for Pointer<0>().
+ *layout.Pointer<size_t>(p_.get()) = size;
+ // Store the characters in the allocation.
+ memcpy(layout.Pointer<char>(p_.get()), s, size + 1);
+ }
+
+ size_t size() const {
+ // Equivalent to reinterpret_cast<size_t&>(*p).
+ return *L::Partial().Pointer<size_t>(p_.get());
+ }
+
+ const char* c_str() const {
+ // Equivalent to reinterpret_cast<char*>(p.get() + sizeof(size_t)).
+ // The argument in Partial(1) specifies that we have size_t[1] in front of
+ // the characters.
+ return L::Partial(1).Pointer<char>(p_.get());
+ }
+
+ private:
+ // Our heap allocation contains a size_t followed by an array of chars.
+ using L = Layout<size_t, char>;
+ std::unique_ptr<unsigned char[]> p_;
+};
+
+TEST(CompactString, Works) {
+ CompactString s = "hello";
+ EXPECT_EQ(5, s.size());
+ EXPECT_STREQ("hello", s.c_str());
+}
+
+} // namespace example
+
+} // namespace
+} // namespace container_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/container/internal/node_hash_policy.h b/third_party/abseil/src/absl/container/internal/node_hash_policy.h
new file mode 100644
index 0000000..4617162
--- /dev/null
+++ b/third_party/abseil/src/absl/container/internal/node_hash_policy.h
@@ -0,0 +1,92 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// Adapts a policy for nodes.
+//
+// The node policy should model:
+//
+// struct Policy {
+// // Returns a new node allocated and constructed using the allocator, using
+// // the specified arguments.
+// template <class Alloc, class... Args>
+// value_type* new_element(Alloc* alloc, Args&&... args) const;
+//
+// // Destroys and deallocates node using the allocator.
+// template <class Alloc>
+// void delete_element(Alloc* alloc, value_type* node) const;
+// };
+//
+// It may also optionally define `value()` and `apply()`. For documentation on
+// these, see hash_policy_traits.h.
+
+#ifndef ABSL_CONTAINER_INTERNAL_NODE_HASH_POLICY_H_
+#define ABSL_CONTAINER_INTERNAL_NODE_HASH_POLICY_H_
+
+#include <cassert>
+#include <cstddef>
+#include <memory>
+#include <type_traits>
+#include <utility>
+
+#include "absl/base/config.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace container_internal {
+
+template <class Reference, class Policy>
+struct node_hash_policy {
+ static_assert(std::is_lvalue_reference<Reference>::value, "");
+
+ using slot_type = typename std::remove_cv<
+ typename std::remove_reference<Reference>::type>::type*;
+
+ template <class Alloc, class... Args>
+ static void construct(Alloc* alloc, slot_type* slot, Args&&... args) {
+ *slot = Policy::new_element(alloc, std::forward<Args>(args)...);
+ }
+
+ template <class Alloc>
+ static void destroy(Alloc* alloc, slot_type* slot) {
+ Policy::delete_element(alloc, *slot);
+ }
+
+ template <class Alloc>
+ static void transfer(Alloc*, slot_type* new_slot, slot_type* old_slot) {
+ *new_slot = *old_slot;
+ }
+
+ static size_t space_used(const slot_type* slot) {
+ if (slot == nullptr) return Policy::element_space_used(nullptr);
+ return Policy::element_space_used(*slot);
+ }
+
+ static Reference element(slot_type* slot) { return **slot; }
+
+ template <class T, class P = Policy>
+ static auto value(T* elem) -> decltype(P::value(elem)) {
+ return P::value(elem);
+ }
+
+ template <class... Ts, class P = Policy>
+ static auto apply(Ts&&... ts) -> decltype(P::apply(std::forward<Ts>(ts)...)) {
+ return P::apply(std::forward<Ts>(ts)...);
+ }
+};
+
+} // namespace container_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_CONTAINER_INTERNAL_NODE_HASH_POLICY_H_
diff --git a/third_party/abseil/src/absl/container/internal/node_hash_policy_test.cc b/third_party/abseil/src/absl/container/internal/node_hash_policy_test.cc
new file mode 100644
index 0000000..84aabba
--- /dev/null
+++ b/third_party/abseil/src/absl/container/internal/node_hash_policy_test.cc
@@ -0,0 +1,69 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/container/internal/node_hash_policy.h"
+
+#include <memory>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/container/internal/hash_policy_traits.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace container_internal {
+namespace {
+
+using ::testing::Pointee;
+
+struct Policy : node_hash_policy<int&, Policy> {
+ using key_type = int;
+ using init_type = int;
+
+ template <class Alloc>
+ static int* new_element(Alloc* alloc, int value) {
+ return new int(value);
+ }
+
+ template <class Alloc>
+ static void delete_element(Alloc* alloc, int* elem) {
+ delete elem;
+ }
+};
+
+using NodePolicy = hash_policy_traits<Policy>;
+
+struct NodeTest : ::testing::Test {
+ std::allocator<int> alloc;
+ int n = 53;
+ int* a = &n;
+};
+
+TEST_F(NodeTest, ConstructDestroy) {
+ NodePolicy::construct(&alloc, &a, 42);
+ EXPECT_THAT(a, Pointee(42));
+ NodePolicy::destroy(&alloc, &a);
+}
+
+TEST_F(NodeTest, transfer) {
+ int s = 42;
+ int* b = &s;
+ NodePolicy::transfer(&alloc, &a, &b);
+ EXPECT_EQ(&s, a);
+}
+
+} // namespace
+} // namespace container_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/container/internal/raw_hash_map.h b/third_party/abseil/src/absl/container/internal/raw_hash_map.h
new file mode 100644
index 0000000..0a02757
--- /dev/null
+++ b/third_party/abseil/src/absl/container/internal/raw_hash_map.h
@@ -0,0 +1,197 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_CONTAINER_INTERNAL_RAW_HASH_MAP_H_
+#define ABSL_CONTAINER_INTERNAL_RAW_HASH_MAP_H_
+
+#include <tuple>
+#include <type_traits>
+#include <utility>
+
+#include "absl/base/internal/throw_delegate.h"
+#include "absl/container/internal/container_memory.h"
+#include "absl/container/internal/raw_hash_set.h" // IWYU pragma: export
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace container_internal {
+
+template <class Policy, class Hash, class Eq, class Alloc>
+class raw_hash_map : public raw_hash_set<Policy, Hash, Eq, Alloc> {
+ // P is Policy. It's passed as a template argument to support maps that have
+ // incomplete types as values, as in unordered_map<K, IncompleteType>.
+ // MappedReference<> may be a non-reference type.
+ template <class P>
+ using MappedReference = decltype(P::value(
+ std::addressof(std::declval<typename raw_hash_map::reference>())));
+
+ // MappedConstReference<> may be a non-reference type.
+ template <class P>
+ using MappedConstReference = decltype(P::value(
+ std::addressof(std::declval<typename raw_hash_map::const_reference>())));
+
+ using KeyArgImpl =
+ KeyArg<IsTransparent<Eq>::value && IsTransparent<Hash>::value>;
+
+ public:
+ using key_type = typename Policy::key_type;
+ using mapped_type = typename Policy::mapped_type;
+ template <class K>
+ using key_arg = typename KeyArgImpl::template type<K, key_type>;
+
+ static_assert(!std::is_reference<key_type>::value, "");
+ // TODO(alkis): remove this assertion and verify that reference mapped_type is
+ // supported.
+ static_assert(!std::is_reference<mapped_type>::value, "");
+
+ using iterator = typename raw_hash_map::raw_hash_set::iterator;
+ using const_iterator = typename raw_hash_map::raw_hash_set::const_iterator;
+
+ raw_hash_map() {}
+ using raw_hash_map::raw_hash_set::raw_hash_set;
+
+ // The last two template parameters ensure that both arguments are rvalues
+ // (lvalue arguments are handled by the overloads below). This is necessary
+ // for supporting bitfield arguments.
+ //
+ // union { int n : 1; };
+ // flat_hash_map<int, int> m;
+ // m.insert_or_assign(n, n);
+ template <class K = key_type, class V = mapped_type, K* = nullptr,
+ V* = nullptr>
+ std::pair<iterator, bool> insert_or_assign(key_arg<K>&& k, V&& v) {
+ return insert_or_assign_impl(std::forward<K>(k), std::forward<V>(v));
+ }
+
+ template <class K = key_type, class V = mapped_type, K* = nullptr>
+ std::pair<iterator, bool> insert_or_assign(key_arg<K>&& k, const V& v) {
+ return insert_or_assign_impl(std::forward<K>(k), v);
+ }
+
+ template <class K = key_type, class V = mapped_type, V* = nullptr>
+ std::pair<iterator, bool> insert_or_assign(const key_arg<K>& k, V&& v) {
+ return insert_or_assign_impl(k, std::forward<V>(v));
+ }
+
+ template <class K = key_type, class V = mapped_type>
+ std::pair<iterator, bool> insert_or_assign(const key_arg<K>& k, const V& v) {
+ return insert_or_assign_impl(k, v);
+ }
+
+ template <class K = key_type, class V = mapped_type, K* = nullptr,
+ V* = nullptr>
+ iterator insert_or_assign(const_iterator, key_arg<K>&& k, V&& v) {
+ return insert_or_assign(std::forward<K>(k), std::forward<V>(v)).first;
+ }
+
+ template <class K = key_type, class V = mapped_type, K* = nullptr>
+ iterator insert_or_assign(const_iterator, key_arg<K>&& k, const V& v) {
+ return insert_or_assign(std::forward<K>(k), v).first;
+ }
+
+ template <class K = key_type, class V = mapped_type, V* = nullptr>
+ iterator insert_or_assign(const_iterator, const key_arg<K>& k, V&& v) {
+ return insert_or_assign(k, std::forward<V>(v)).first;
+ }
+
+ template <class K = key_type, class V = mapped_type>
+ iterator insert_or_assign(const_iterator, const key_arg<K>& k, const V& v) {
+ return insert_or_assign(k, v).first;
+ }
+
+ // All `try_emplace()` overloads make the same guarantees regarding rvalue
+ // arguments as `std::unordered_map::try_emplace()`, namely that these
+ // functions will not move from rvalue arguments if insertions do not happen.
+ template <class K = key_type, class... Args,
+ typename std::enable_if<
+ !std::is_convertible<K, const_iterator>::value, int>::type = 0,
+ K* = nullptr>
+ std::pair<iterator, bool> try_emplace(key_arg<K>&& k, Args&&... args) {
+ return try_emplace_impl(std::forward<K>(k), std::forward<Args>(args)...);
+ }
+
+ template <class K = key_type, class... Args,
+ typename std::enable_if<
+ !std::is_convertible<K, const_iterator>::value, int>::type = 0>
+ std::pair<iterator, bool> try_emplace(const key_arg<K>& k, Args&&... args) {
+ return try_emplace_impl(k, std::forward<Args>(args)...);
+ }
+
+ template <class K = key_type, class... Args, K* = nullptr>
+ iterator try_emplace(const_iterator, key_arg<K>&& k, Args&&... args) {
+ return try_emplace(std::forward<K>(k), std::forward<Args>(args)...).first;
+ }
+
+ template <class K = key_type, class... Args>
+ iterator try_emplace(const_iterator, const key_arg<K>& k, Args&&... args) {
+ return try_emplace(k, std::forward<Args>(args)...).first;
+ }
+
+ template <class K = key_type, class P = Policy>
+ MappedReference<P> at(const key_arg<K>& key) {
+ auto it = this->find(key);
+ if (it == this->end()) {
+ base_internal::ThrowStdOutOfRange(
+ "absl::container_internal::raw_hash_map<>::at");
+ }
+ return Policy::value(&*it);
+ }
+
+ template <class K = key_type, class P = Policy>
+ MappedConstReference<P> at(const key_arg<K>& key) const {
+ auto it = this->find(key);
+ if (it == this->end()) {
+ base_internal::ThrowStdOutOfRange(
+ "absl::container_internal::raw_hash_map<>::at");
+ }
+ return Policy::value(&*it);
+ }
+
+ template <class K = key_type, class P = Policy, K* = nullptr>
+ MappedReference<P> operator[](key_arg<K>&& key) {
+ return Policy::value(&*try_emplace(std::forward<K>(key)).first);
+ }
+
+ template <class K = key_type, class P = Policy>
+ MappedReference<P> operator[](const key_arg<K>& key) {
+ return Policy::value(&*try_emplace(key).first);
+ }
+
+ private:
+ template <class K, class V>
+ std::pair<iterator, bool> insert_or_assign_impl(K&& k, V&& v) {
+ auto res = this->find_or_prepare_insert(k);
+ if (res.second)
+ this->emplace_at(res.first, std::forward<K>(k), std::forward<V>(v));
+ else
+ Policy::value(&*this->iterator_at(res.first)) = std::forward<V>(v);
+ return {this->iterator_at(res.first), res.second};
+ }
+
+ template <class K = key_type, class... Args>
+ std::pair<iterator, bool> try_emplace_impl(K&& k, Args&&... args) {
+ auto res = this->find_or_prepare_insert(k);
+ if (res.second)
+ this->emplace_at(res.first, std::piecewise_construct,
+ std::forward_as_tuple(std::forward<K>(k)),
+ std::forward_as_tuple(std::forward<Args>(args)...));
+ return {this->iterator_at(res.first), res.second};
+ }
+};
+
+} // namespace container_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_CONTAINER_INTERNAL_RAW_HASH_MAP_H_
diff --git a/third_party/abseil/src/absl/container/internal/raw_hash_set.cc b/third_party/abseil/src/absl/container/internal/raw_hash_set.cc
new file mode 100644
index 0000000..bfef071
--- /dev/null
+++ b/third_party/abseil/src/absl/container/internal/raw_hash_set.cc
@@ -0,0 +1,61 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/container/internal/raw_hash_set.h"
+
+#include <atomic>
+#include <cstddef>
+
+#include "absl/base/config.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace container_internal {
+
+constexpr size_t Group::kWidth;
+
+// Returns "random" seed.
+inline size_t RandomSeed() {
+#ifdef ABSL_HAVE_THREAD_LOCAL
+ static thread_local size_t counter = 0;
+ size_t value = ++counter;
+#else // ABSL_HAVE_THREAD_LOCAL
+ static std::atomic<size_t> counter(0);
+ size_t value = counter.fetch_add(1, std::memory_order_relaxed);
+#endif // ABSL_HAVE_THREAD_LOCAL
+ return value ^ static_cast<size_t>(reinterpret_cast<uintptr_t>(&counter));
+}
+
+bool ShouldInsertBackwards(size_t hash, ctrl_t* ctrl) {
+ // To avoid problems with weak hashes and single bit tests, we use % 13.
+ // TODO(kfm,sbenza): revisit after we do unconditional mixing
+ return (H1(hash, ctrl) ^ RandomSeed()) % 13 > 6;
+}
+
+void ConvertDeletedToEmptyAndFullToDeleted(
+ ctrl_t* ctrl, size_t capacity) {
+ assert(ctrl[capacity] == kSentinel);
+ assert(IsValidCapacity(capacity));
+ for (ctrl_t* pos = ctrl; pos != ctrl + capacity + 1; pos += Group::kWidth) {
+ Group{pos}.ConvertSpecialToEmptyAndFullToDeleted(pos);
+ }
+ // Copy the cloned ctrl bytes.
+ std::memcpy(ctrl + capacity + 1, ctrl, Group::kWidth);
+ ctrl[capacity] = kSentinel;
+}
+
+
+} // namespace container_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/container/internal/raw_hash_set.h b/third_party/abseil/src/absl/container/internal/raw_hash_set.h
new file mode 100644
index 0000000..02158c4
--- /dev/null
+++ b/third_party/abseil/src/absl/container/internal/raw_hash_set.h
@@ -0,0 +1,1903 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// An open-addressing
+// hashtable with quadratic probing.
+//
+// This is a low level hashtable on top of which different interfaces can be
+// implemented, like flat_hash_set, node_hash_set, string_hash_set, etc.
+//
+// The table interface is similar to that of std::unordered_set. Notable
+// differences are that most member functions support heterogeneous keys when
+// BOTH the hash and eq functions are marked as transparent. They do so by
+// providing a typedef called `is_transparent`.
+//
+// When heterogeneous lookup is enabled, functions that take key_type act as if
+// they have an overload set like:
+//
+// iterator find(const key_type& key);
+// template <class K>
+// iterator find(const K& key);
+//
+// size_type erase(const key_type& key);
+// template <class K>
+// size_type erase(const K& key);
+//
+// std::pair<iterator, iterator> equal_range(const key_type& key);
+// template <class K>
+// std::pair<iterator, iterator> equal_range(const K& key);
+//
+// When heterogeneous lookup is disabled, only the explicit `key_type` overloads
+// exist.
+//
+// find() also supports passing the hash explicitly:
+//
+// iterator find(const key_type& key, size_t hash);
+// template <class U>
+// iterator find(const U& key, size_t hash);
+//
+// In addition the pointer to element and iterator stability guarantees are
+// weaker: all iterators and pointers are invalidated after a new element is
+// inserted.
+//
+// IMPLEMENTATION DETAILS
+//
+// The table stores elements inline in a slot array. In addition to the slot
+// array the table maintains some control state per slot. The extra state is one
+// byte per slot and stores empty or deleted marks, or alternatively 7 bits from
+// the hash of an occupied slot. The table is split into logical groups of
+// slots, like so:
+//
+// Group 1 Group 2 Group 3
+// +---------------+---------------+---------------+
+// | | | | | | | | | | | | | | | | | | | | | | | | |
+// +---------------+---------------+---------------+
+//
+// On lookup the hash is split into two parts:
+// - H2: 7 bits (those stored in the control bytes)
+// - H1: the rest of the bits
+// The groups are probed using H1. For each group the slots are matched to H2 in
+// parallel. Because H2 is 7 bits (128 states) and the number of slots per group
+// is low (8 or 16) in almost all cases a match in H2 is also a lookup hit.
+//
+// On insert, once the right group is found (as in lookup), its slots are
+// filled in order.
+//
+// On erase a slot is cleared. In case the group did not have any empty slots
+// before the erase, the erased slot is marked as deleted.
+//
+// Groups without empty slots (but maybe with deleted slots) extend the probe
+// sequence. The probing algorithm is quadratic. Given N the number of groups,
+// the probing function for the i'th probe is:
+//
+// P(0) = H1 % N
+//
+// P(i) = (P(i - 1) + i) % N
+//
+// This probing function guarantees that after N probes, all the groups of the
+// table will be probed exactly once.
+
+#ifndef ABSL_CONTAINER_INTERNAL_RAW_HASH_SET_H_
+#define ABSL_CONTAINER_INTERNAL_RAW_HASH_SET_H_
+
+#include <algorithm>
+#include <cmath>
+#include <cstdint>
+#include <cstring>
+#include <iterator>
+#include <limits>
+#include <memory>
+#include <tuple>
+#include <type_traits>
+#include <utility>
+
+#include "absl/base/internal/bits.h"
+#include "absl/base/internal/endian.h"
+#include "absl/base/optimization.h"
+#include "absl/base/port.h"
+#include "absl/container/internal/common.h"
+#include "absl/container/internal/compressed_tuple.h"
+#include "absl/container/internal/container_memory.h"
+#include "absl/container/internal/hash_policy_traits.h"
+#include "absl/container/internal/hashtable_debug_hooks.h"
+#include "absl/container/internal/hashtablez_sampler.h"
+#include "absl/container/internal/have_sse.h"
+#include "absl/container/internal/layout.h"
+#include "absl/memory/memory.h"
+#include "absl/meta/type_traits.h"
+#include "absl/utility/utility.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace container_internal {
+
+template <typename AllocType>
+void SwapAlloc(AllocType& lhs, AllocType& rhs,
+ std::true_type /* propagate_on_container_swap */) {
+ using std::swap;
+ swap(lhs, rhs);
+}
+template <typename AllocType>
+void SwapAlloc(AllocType& /*lhs*/, AllocType& /*rhs*/,
+ std::false_type /* propagate_on_container_swap */) {}
+
+template <size_t Width>
+class probe_seq {
+ public:
+ probe_seq(size_t hash, size_t mask) {
+ assert(((mask + 1) & mask) == 0 && "not a mask");
+ mask_ = mask;
+ offset_ = hash & mask_;
+ }
+ size_t offset() const { return offset_; }
+ size_t offset(size_t i) const { return (offset_ + i) & mask_; }
+
+ void next() {
+ index_ += Width;
+ offset_ += index_;
+ offset_ &= mask_;
+ }
+ // 0-based probe index. The i-th probe in the probe sequence.
+ size_t index() const { return index_; }
+
+ private:
+ size_t mask_;
+ size_t offset_;
+ size_t index_ = 0;
+};
+
+template <class ContainerKey, class Hash, class Eq>
+struct RequireUsableKey {
+ template <class PassedKey, class... Args>
+ std::pair<
+ decltype(std::declval<const Hash&>()(std::declval<const PassedKey&>())),
+ decltype(std::declval<const Eq&>()(std::declval<const ContainerKey&>(),
+ std::declval<const PassedKey&>()))>*
+ operator()(const PassedKey&, const Args&...) const;
+};
+
+template <class E, class Policy, class Hash, class Eq, class... Ts>
+struct IsDecomposable : std::false_type {};
+
+template <class Policy, class Hash, class Eq, class... Ts>
+struct IsDecomposable<
+ absl::void_t<decltype(
+ Policy::apply(RequireUsableKey<typename Policy::key_type, Hash, Eq>(),
+ std::declval<Ts>()...))>,
+ Policy, Hash, Eq, Ts...> : std::true_type {};
+
+// TODO(alkis): Switch to std::is_nothrow_swappable when gcc/clang supports it.
+template <class T>
+constexpr bool IsNoThrowSwappable(std::true_type = {} /* is_swappable */) {
+ using std::swap;
+ return noexcept(swap(std::declval<T&>(), std::declval<T&>()));
+}
+template <class T>
+constexpr bool IsNoThrowSwappable(std::false_type /* is_swappable */) {
+ return false;
+}
+
+template <typename T>
+int TrailingZeros(T x) {
+ return sizeof(T) == 8 ? base_internal::CountTrailingZerosNonZero64(
+ static_cast<uint64_t>(x))
+ : base_internal::CountTrailingZerosNonZero32(
+ static_cast<uint32_t>(x));
+}
+
+template <typename T>
+int LeadingZeros(T x) {
+ return sizeof(T) == 8
+ ? base_internal::CountLeadingZeros64(static_cast<uint64_t>(x))
+ : base_internal::CountLeadingZeros32(static_cast<uint32_t>(x));
+}
+
+// An abstraction over a bitmask. It provides an easy way to iterate through the
+// indexes of the set bits of a bitmask. When Shift=0 (platforms with SSE),
+// this is a true bitmask. On non-SSE, platforms the arithematic used to
+// emulate the SSE behavior works in bytes (Shift=3) and leaves each bytes as
+// either 0x00 or 0x80.
+//
+// For example:
+// for (int i : BitMask<uint32_t, 16>(0x5)) -> yields 0, 2
+// for (int i : BitMask<uint64_t, 8, 3>(0x0000000080800000)) -> yields 2, 3
+template <class T, int SignificantBits, int Shift = 0>
+class BitMask {
+ static_assert(std::is_unsigned<T>::value, "");
+ static_assert(Shift == 0 || Shift == 3, "");
+
+ public:
+ // These are useful for unit tests (gunit).
+ using value_type = int;
+ using iterator = BitMask;
+ using const_iterator = BitMask;
+
+ explicit BitMask(T mask) : mask_(mask) {}
+ BitMask& operator++() {
+ mask_ &= (mask_ - 1);
+ return *this;
+ }
+ explicit operator bool() const { return mask_ != 0; }
+ int operator*() const { return LowestBitSet(); }
+ int LowestBitSet() const {
+ return container_internal::TrailingZeros(mask_) >> Shift;
+ }
+ int HighestBitSet() const {
+ return (sizeof(T) * CHAR_BIT - container_internal::LeadingZeros(mask_) -
+ 1) >>
+ Shift;
+ }
+
+ BitMask begin() const { return *this; }
+ BitMask end() const { return BitMask(0); }
+
+ int TrailingZeros() const {
+ return container_internal::TrailingZeros(mask_) >> Shift;
+ }
+
+ int LeadingZeros() const {
+ constexpr int total_significant_bits = SignificantBits << Shift;
+ constexpr int extra_bits = sizeof(T) * 8 - total_significant_bits;
+ return container_internal::LeadingZeros(mask_ << extra_bits) >> Shift;
+ }
+
+ private:
+ friend bool operator==(const BitMask& a, const BitMask& b) {
+ return a.mask_ == b.mask_;
+ }
+ friend bool operator!=(const BitMask& a, const BitMask& b) {
+ return a.mask_ != b.mask_;
+ }
+
+ T mask_;
+};
+
+using ctrl_t = signed char;
+using h2_t = uint8_t;
+
+// The values here are selected for maximum performance. See the static asserts
+// below for details.
+enum Ctrl : ctrl_t {
+ kEmpty = -128, // 0b10000000
+ kDeleted = -2, // 0b11111110
+ kSentinel = -1, // 0b11111111
+};
+static_assert(
+ kEmpty & kDeleted & kSentinel & 0x80,
+ "Special markers need to have the MSB to make checking for them efficient");
+static_assert(kEmpty < kSentinel && kDeleted < kSentinel,
+ "kEmpty and kDeleted must be smaller than kSentinel to make the "
+ "SIMD test of IsEmptyOrDeleted() efficient");
+static_assert(kSentinel == -1,
+ "kSentinel must be -1 to elide loading it from memory into SIMD "
+ "registers (pcmpeqd xmm, xmm)");
+static_assert(kEmpty == -128,
+ "kEmpty must be -128 to make the SIMD check for its "
+ "existence efficient (psignb xmm, xmm)");
+static_assert(~kEmpty & ~kDeleted & kSentinel & 0x7F,
+ "kEmpty and kDeleted must share an unset bit that is not shared "
+ "by kSentinel to make the scalar test for MatchEmptyOrDeleted() "
+ "efficient");
+static_assert(kDeleted == -2,
+ "kDeleted must be -2 to make the implementation of "
+ "ConvertSpecialToEmptyAndFullToDeleted efficient");
+
+// A single block of empty control bytes for tables without any slots allocated.
+// This enables removing a branch in the hot path of find().
+inline ctrl_t* EmptyGroup() {
+ alignas(16) static constexpr ctrl_t empty_group[] = {
+ kSentinel, kEmpty, kEmpty, kEmpty, kEmpty, kEmpty, kEmpty, kEmpty,
+ kEmpty, kEmpty, kEmpty, kEmpty, kEmpty, kEmpty, kEmpty, kEmpty};
+ return const_cast<ctrl_t*>(empty_group);
+}
+
+// Mixes a randomly generated per-process seed with `hash` and `ctrl` to
+// randomize insertion order within groups.
+bool ShouldInsertBackwards(size_t hash, ctrl_t* ctrl);
+
+// Returns a hash seed.
+//
+// The seed consists of the ctrl_ pointer, which adds enough entropy to ensure
+// non-determinism of iteration order in most cases.
+inline size_t HashSeed(const ctrl_t* ctrl) {
+ // The low bits of the pointer have little or no entropy because of
+ // alignment. We shift the pointer to try to use higher entropy bits. A
+ // good number seems to be 12 bits, because that aligns with page size.
+ return reinterpret_cast<uintptr_t>(ctrl) >> 12;
+}
+
+inline size_t H1(size_t hash, const ctrl_t* ctrl) {
+ return (hash >> 7) ^ HashSeed(ctrl);
+}
+inline ctrl_t H2(size_t hash) { return hash & 0x7F; }
+
+inline bool IsEmpty(ctrl_t c) { return c == kEmpty; }
+inline bool IsFull(ctrl_t c) { return c >= 0; }
+inline bool IsDeleted(ctrl_t c) { return c == kDeleted; }
+inline bool IsEmptyOrDeleted(ctrl_t c) { return c < kSentinel; }
+
+#if ABSL_INTERNAL_RAW_HASH_SET_HAVE_SSE2
+
+// https://github.com/abseil/abseil-cpp/issues/209
+// https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87853
+// _mm_cmpgt_epi8 is broken under GCC with -funsigned-char
+// Work around this by using the portable implementation of Group
+// when using -funsigned-char under GCC.
+inline __m128i _mm_cmpgt_epi8_fixed(__m128i a, __m128i b) {
+#if defined(__GNUC__) && !defined(__clang__)
+ if (std::is_unsigned<char>::value) {
+ const __m128i mask = _mm_set1_epi8(0x80);
+ const __m128i diff = _mm_subs_epi8(b, a);
+ return _mm_cmpeq_epi8(_mm_and_si128(diff, mask), mask);
+ }
+#endif
+ return _mm_cmpgt_epi8(a, b);
+}
+
+struct GroupSse2Impl {
+ static constexpr size_t kWidth = 16; // the number of slots per group
+
+ explicit GroupSse2Impl(const ctrl_t* pos) {
+ ctrl = _mm_loadu_si128(reinterpret_cast<const __m128i*>(pos));
+ }
+
+ // Returns a bitmask representing the positions of slots that match hash.
+ BitMask<uint32_t, kWidth> Match(h2_t hash) const {
+ auto match = _mm_set1_epi8(hash);
+ return BitMask<uint32_t, kWidth>(
+ _mm_movemask_epi8(_mm_cmpeq_epi8(match, ctrl)));
+ }
+
+ // Returns a bitmask representing the positions of empty slots.
+ BitMask<uint32_t, kWidth> MatchEmpty() const {
+#if ABSL_INTERNAL_RAW_HASH_SET_HAVE_SSSE3
+ // This only works because kEmpty is -128.
+ return BitMask<uint32_t, kWidth>(
+ _mm_movemask_epi8(_mm_sign_epi8(ctrl, ctrl)));
+#else
+ return Match(static_cast<h2_t>(kEmpty));
+#endif
+ }
+
+ // Returns a bitmask representing the positions of empty or deleted slots.
+ BitMask<uint32_t, kWidth> MatchEmptyOrDeleted() const {
+ auto special = _mm_set1_epi8(kSentinel);
+ return BitMask<uint32_t, kWidth>(
+ _mm_movemask_epi8(_mm_cmpgt_epi8_fixed(special, ctrl)));
+ }
+
+ // Returns the number of trailing empty or deleted elements in the group.
+ uint32_t CountLeadingEmptyOrDeleted() const {
+ auto special = _mm_set1_epi8(kSentinel);
+ return TrailingZeros(
+ _mm_movemask_epi8(_mm_cmpgt_epi8_fixed(special, ctrl)) + 1);
+ }
+
+ void ConvertSpecialToEmptyAndFullToDeleted(ctrl_t* dst) const {
+ auto msbs = _mm_set1_epi8(static_cast<char>(-128));
+ auto x126 = _mm_set1_epi8(126);
+#if ABSL_INTERNAL_RAW_HASH_SET_HAVE_SSSE3
+ auto res = _mm_or_si128(_mm_shuffle_epi8(x126, ctrl), msbs);
+#else
+ auto zero = _mm_setzero_si128();
+ auto special_mask = _mm_cmpgt_epi8_fixed(zero, ctrl);
+ auto res = _mm_or_si128(msbs, _mm_andnot_si128(special_mask, x126));
+#endif
+ _mm_storeu_si128(reinterpret_cast<__m128i*>(dst), res);
+ }
+
+ __m128i ctrl;
+};
+#endif // ABSL_INTERNAL_RAW_HASH_SET_HAVE_SSE2
+
+struct GroupPortableImpl {
+ static constexpr size_t kWidth = 8;
+
+ explicit GroupPortableImpl(const ctrl_t* pos)
+ : ctrl(little_endian::Load64(pos)) {}
+
+ BitMask<uint64_t, kWidth, 3> Match(h2_t hash) const {
+ // For the technique, see:
+ // http://graphics.stanford.edu/~seander/bithacks.html##ValueInWord
+ // (Determine if a word has a byte equal to n).
+ //
+ // Caveat: there are false positives but:
+ // - they only occur if there is a real match
+ // - they never occur on kEmpty, kDeleted, kSentinel
+ // - they will be handled gracefully by subsequent checks in code
+ //
+ // Example:
+ // v = 0x1716151413121110
+ // hash = 0x12
+ // retval = (v - lsbs) & ~v & msbs = 0x0000000080800000
+ constexpr uint64_t msbs = 0x8080808080808080ULL;
+ constexpr uint64_t lsbs = 0x0101010101010101ULL;
+ auto x = ctrl ^ (lsbs * hash);
+ return BitMask<uint64_t, kWidth, 3>((x - lsbs) & ~x & msbs);
+ }
+
+ BitMask<uint64_t, kWidth, 3> MatchEmpty() const {
+ constexpr uint64_t msbs = 0x8080808080808080ULL;
+ return BitMask<uint64_t, kWidth, 3>((ctrl & (~ctrl << 6)) & msbs);
+ }
+
+ BitMask<uint64_t, kWidth, 3> MatchEmptyOrDeleted() const {
+ constexpr uint64_t msbs = 0x8080808080808080ULL;
+ return BitMask<uint64_t, kWidth, 3>((ctrl & (~ctrl << 7)) & msbs);
+ }
+
+ uint32_t CountLeadingEmptyOrDeleted() const {
+ constexpr uint64_t gaps = 0x00FEFEFEFEFEFEFEULL;
+ return (TrailingZeros(((~ctrl & (ctrl >> 7)) | gaps) + 1) + 7) >> 3;
+ }
+
+ void ConvertSpecialToEmptyAndFullToDeleted(ctrl_t* dst) const {
+ constexpr uint64_t msbs = 0x8080808080808080ULL;
+ constexpr uint64_t lsbs = 0x0101010101010101ULL;
+ auto x = ctrl & msbs;
+ auto res = (~x + (x >> 7)) & ~lsbs;
+ little_endian::Store64(dst, res);
+ }
+
+ uint64_t ctrl;
+};
+
+#if ABSL_INTERNAL_RAW_HASH_SET_HAVE_SSE2
+using Group = GroupSse2Impl;
+#else
+using Group = GroupPortableImpl;
+#endif
+
+template <class Policy, class Hash, class Eq, class Alloc>
+class raw_hash_set;
+
+inline bool IsValidCapacity(size_t n) { return ((n + 1) & n) == 0 && n > 0; }
+
+// PRECONDITION:
+// IsValidCapacity(capacity)
+// ctrl[capacity] == kSentinel
+// ctrl[i] != kSentinel for all i < capacity
+// Applies mapping for every byte in ctrl:
+// DELETED -> EMPTY
+// EMPTY -> EMPTY
+// FULL -> DELETED
+void ConvertDeletedToEmptyAndFullToDeleted(ctrl_t* ctrl, size_t capacity);
+
+// Rounds up the capacity to the next power of 2 minus 1, with a minimum of 1.
+inline size_t NormalizeCapacity(size_t n) {
+ return n ? ~size_t{} >> LeadingZeros(n) : 1;
+}
+
+// We use 7/8th as maximum load factor.
+// For 16-wide groups, that gives an average of two empty slots per group.
+inline size_t CapacityToGrowth(size_t capacity) {
+ assert(IsValidCapacity(capacity));
+ // `capacity*7/8`
+ if (Group::kWidth == 8 && capacity == 7) {
+ // x-x/8 does not work when x==7.
+ return 6;
+ }
+ return capacity - capacity / 8;
+}
+// From desired "growth" to a lowerbound of the necessary capacity.
+// Might not be a valid one and required NormalizeCapacity().
+inline size_t GrowthToLowerboundCapacity(size_t growth) {
+ // `growth*8/7`
+ if (Group::kWidth == 8 && growth == 7) {
+ // x+(x-1)/7 does not work when x==7.
+ return 8;
+ }
+ return growth + static_cast<size_t>((static_cast<int64_t>(growth) - 1) / 7);
+}
+
+inline void AssertIsFull(ctrl_t* ctrl) {
+ ABSL_HARDENING_ASSERT((ctrl != nullptr && IsFull(*ctrl)) &&
+ "Invalid operation on iterator. The element might have "
+ "been erased, or the table might have rehashed.");
+}
+
+inline void AssertIsValid(ctrl_t* ctrl) {
+ ABSL_HARDENING_ASSERT((ctrl == nullptr || IsFull(*ctrl)) &&
+ "Invalid operation on iterator. The element might have "
+ "been erased, or the table might have rehashed.");
+}
+
+struct FindInfo {
+ size_t offset;
+ size_t probe_length;
+};
+
+// The representation of the object has two modes:
+// - small: For capacities < kWidth-1
+// - large: For the rest.
+//
+// Differences:
+// - In small mode we are able to use the whole capacity. The extra control
+// bytes give us at least one "empty" control byte to stop the iteration.
+// This is important to make 1 a valid capacity.
+//
+// - In small mode only the first `capacity()` control bytes after the
+// sentinel are valid. The rest contain dummy kEmpty values that do not
+// represent a real slot. This is important to take into account on
+// find_first_non_full(), where we never try ShouldInsertBackwards() for
+// small tables.
+inline bool is_small(size_t capacity) { return capacity < Group::kWidth - 1; }
+
+inline probe_seq<Group::kWidth> probe(ctrl_t* ctrl, size_t hash,
+ size_t capacity) {
+ return probe_seq<Group::kWidth>(H1(hash, ctrl), capacity);
+}
+
+// Probes the raw_hash_set with the probe sequence for hash and returns the
+// pointer to the first empty or deleted slot.
+// NOTE: this function must work with tables having both kEmpty and kDelete
+// in one group. Such tables appears during drop_deletes_without_resize.
+//
+// This function is very useful when insertions happen and:
+// - the input is already a set
+// - there are enough slots
+// - the element with the hash is not in the table
+inline FindInfo find_first_non_full(ctrl_t* ctrl, size_t hash,
+ size_t capacity) {
+ auto seq = probe(ctrl, hash, capacity);
+ while (true) {
+ Group g{ctrl + seq.offset()};
+ auto mask = g.MatchEmptyOrDeleted();
+ if (mask) {
+#if !defined(NDEBUG)
+ // We want to add entropy even when ASLR is not enabled.
+ // In debug build we will randomly insert in either the front or back of
+ // the group.
+ // TODO(kfm,sbenza): revisit after we do unconditional mixing
+ if (!is_small(capacity) && ShouldInsertBackwards(hash, ctrl)) {
+ return {seq.offset(mask.HighestBitSet()), seq.index()};
+ }
+#endif
+ return {seq.offset(mask.LowestBitSet()), seq.index()};
+ }
+ seq.next();
+ assert(seq.index() < capacity && "full table!");
+ }
+}
+
+// Policy: a policy defines how to perform different operations on
+// the slots of the hashtable (see hash_policy_traits.h for the full interface
+// of policy).
+//
+// Hash: a (possibly polymorphic) functor that hashes keys of the hashtable. The
+// functor should accept a key and return size_t as hash. For best performance
+// it is important that the hash function provides high entropy across all bits
+// of the hash.
+//
+// Eq: a (possibly polymorphic) functor that compares two keys for equality. It
+// should accept two (of possibly different type) keys and return a bool: true
+// if they are equal, false if they are not. If two keys compare equal, then
+// their hash values as defined by Hash MUST be equal.
+//
+// Allocator: an Allocator
+// [https://en.cppreference.com/w/cpp/named_req/Allocator] with which
+// the storage of the hashtable will be allocated and the elements will be
+// constructed and destroyed.
+template <class Policy, class Hash, class Eq, class Alloc>
+class raw_hash_set {
+ using PolicyTraits = hash_policy_traits<Policy>;
+ using KeyArgImpl =
+ KeyArg<IsTransparent<Eq>::value && IsTransparent<Hash>::value>;
+
+ public:
+ using init_type = typename PolicyTraits::init_type;
+ using key_type = typename PolicyTraits::key_type;
+ // TODO(sbenza): Hide slot_type as it is an implementation detail. Needs user
+ // code fixes!
+ using slot_type = typename PolicyTraits::slot_type;
+ using allocator_type = Alloc;
+ using size_type = size_t;
+ using difference_type = ptrdiff_t;
+ using hasher = Hash;
+ using key_equal = Eq;
+ using policy_type = Policy;
+ using value_type = typename PolicyTraits::value_type;
+ using reference = value_type&;
+ using const_reference = const value_type&;
+ using pointer = typename absl::allocator_traits<
+ allocator_type>::template rebind_traits<value_type>::pointer;
+ using const_pointer = typename absl::allocator_traits<
+ allocator_type>::template rebind_traits<value_type>::const_pointer;
+
+ // Alias used for heterogeneous lookup functions.
+ // `key_arg<K>` evaluates to `K` when the functors are transparent and to
+ // `key_type` otherwise. It permits template argument deduction on `K` for the
+ // transparent case.
+ template <class K>
+ using key_arg = typename KeyArgImpl::template type<K, key_type>;
+
+ private:
+ // Give an early error when key_type is not hashable/eq.
+ auto KeyTypeCanBeHashed(const Hash& h, const key_type& k) -> decltype(h(k));
+ auto KeyTypeCanBeEq(const Eq& eq, const key_type& k) -> decltype(eq(k, k));
+
+ using Layout = absl::container_internal::Layout<ctrl_t, slot_type>;
+
+ static Layout MakeLayout(size_t capacity) {
+ assert(IsValidCapacity(capacity));
+ return Layout(capacity + Group::kWidth + 1, capacity);
+ }
+
+ using AllocTraits = absl::allocator_traits<allocator_type>;
+ using SlotAlloc = typename absl::allocator_traits<
+ allocator_type>::template rebind_alloc<slot_type>;
+ using SlotAllocTraits = typename absl::allocator_traits<
+ allocator_type>::template rebind_traits<slot_type>;
+
+ static_assert(std::is_lvalue_reference<reference>::value,
+ "Policy::element() must return a reference");
+
+ template <typename T>
+ struct SameAsElementReference
+ : std::is_same<typename std::remove_cv<
+ typename std::remove_reference<reference>::type>::type,
+ typename std::remove_cv<
+ typename std::remove_reference<T>::type>::type> {};
+
+ // An enabler for insert(T&&): T must be convertible to init_type or be the
+ // same as [cv] value_type [ref].
+ // Note: we separate SameAsElementReference into its own type to avoid using
+ // reference unless we need to. MSVC doesn't seem to like it in some
+ // cases.
+ template <class T>
+ using RequiresInsertable = typename std::enable_if<
+ absl::disjunction<std::is_convertible<T, init_type>,
+ SameAsElementReference<T>>::value,
+ int>::type;
+
+ // RequiresNotInit is a workaround for gcc prior to 7.1.
+ // See https://godbolt.org/g/Y4xsUh.
+ template <class T>
+ using RequiresNotInit =
+ typename std::enable_if<!std::is_same<T, init_type>::value, int>::type;
+
+ template <class... Ts>
+ using IsDecomposable = IsDecomposable<void, PolicyTraits, Hash, Eq, Ts...>;
+
+ public:
+ static_assert(std::is_same<pointer, value_type*>::value,
+ "Allocators with custom pointer types are not supported");
+ static_assert(std::is_same<const_pointer, const value_type*>::value,
+ "Allocators with custom pointer types are not supported");
+
+ class iterator {
+ friend class raw_hash_set;
+
+ public:
+ using iterator_category = std::forward_iterator_tag;
+ using value_type = typename raw_hash_set::value_type;
+ using reference =
+ absl::conditional_t<PolicyTraits::constant_iterators::value,
+ const value_type&, value_type&>;
+ using pointer = absl::remove_reference_t<reference>*;
+ using difference_type = typename raw_hash_set::difference_type;
+
+ iterator() {}
+
+ // PRECONDITION: not an end() iterator.
+ reference operator*() const {
+ AssertIsFull(ctrl_);
+ return PolicyTraits::element(slot_);
+ }
+
+ // PRECONDITION: not an end() iterator.
+ pointer operator->() const { return &operator*(); }
+
+ // PRECONDITION: not an end() iterator.
+ iterator& operator++() {
+ AssertIsFull(ctrl_);
+ ++ctrl_;
+ ++slot_;
+ skip_empty_or_deleted();
+ return *this;
+ }
+ // PRECONDITION: not an end() iterator.
+ iterator operator++(int) {
+ auto tmp = *this;
+ ++*this;
+ return tmp;
+ }
+
+ friend bool operator==(const iterator& a, const iterator& b) {
+ AssertIsValid(a.ctrl_);
+ AssertIsValid(b.ctrl_);
+ return a.ctrl_ == b.ctrl_;
+ }
+ friend bool operator!=(const iterator& a, const iterator& b) {
+ return !(a == b);
+ }
+
+ private:
+ iterator(ctrl_t* ctrl, slot_type* slot) : ctrl_(ctrl), slot_(slot) {
+ // This assumption helps the compiler know that any non-end iterator is
+ // not equal to any end iterator.
+ ABSL_INTERNAL_ASSUME(ctrl != nullptr);
+ }
+
+ void skip_empty_or_deleted() {
+ while (IsEmptyOrDeleted(*ctrl_)) {
+ uint32_t shift = Group{ctrl_}.CountLeadingEmptyOrDeleted();
+ ctrl_ += shift;
+ slot_ += shift;
+ }
+ if (ABSL_PREDICT_FALSE(*ctrl_ == kSentinel)) ctrl_ = nullptr;
+ }
+
+ ctrl_t* ctrl_ = nullptr;
+ // To avoid uninitialized member warnings, put slot_ in an anonymous union.
+ // The member is not initialized on singleton and end iterators.
+ union {
+ slot_type* slot_;
+ };
+ };
+
+ class const_iterator {
+ friend class raw_hash_set;
+
+ public:
+ using iterator_category = typename iterator::iterator_category;
+ using value_type = typename raw_hash_set::value_type;
+ using reference = typename raw_hash_set::const_reference;
+ using pointer = typename raw_hash_set::const_pointer;
+ using difference_type = typename raw_hash_set::difference_type;
+
+ const_iterator() {}
+ // Implicit construction from iterator.
+ const_iterator(iterator i) : inner_(std::move(i)) {}
+
+ reference operator*() const { return *inner_; }
+ pointer operator->() const { return inner_.operator->(); }
+
+ const_iterator& operator++() {
+ ++inner_;
+ return *this;
+ }
+ const_iterator operator++(int) { return inner_++; }
+
+ friend bool operator==(const const_iterator& a, const const_iterator& b) {
+ return a.inner_ == b.inner_;
+ }
+ friend bool operator!=(const const_iterator& a, const const_iterator& b) {
+ return !(a == b);
+ }
+
+ private:
+ const_iterator(const ctrl_t* ctrl, const slot_type* slot)
+ : inner_(const_cast<ctrl_t*>(ctrl), const_cast<slot_type*>(slot)) {}
+
+ iterator inner_;
+ };
+
+ using node_type = node_handle<Policy, hash_policy_traits<Policy>, Alloc>;
+ using insert_return_type = InsertReturnType<iterator, node_type>;
+
+ raw_hash_set() noexcept(
+ std::is_nothrow_default_constructible<hasher>::value&&
+ std::is_nothrow_default_constructible<key_equal>::value&&
+ std::is_nothrow_default_constructible<allocator_type>::value) {}
+
+ explicit raw_hash_set(size_t bucket_count, const hasher& hash = hasher(),
+ const key_equal& eq = key_equal(),
+ const allocator_type& alloc = allocator_type())
+ : ctrl_(EmptyGroup()), settings_(0, hash, eq, alloc) {
+ if (bucket_count) {
+ capacity_ = NormalizeCapacity(bucket_count);
+ initialize_slots();
+ }
+ }
+
+ raw_hash_set(size_t bucket_count, const hasher& hash,
+ const allocator_type& alloc)
+ : raw_hash_set(bucket_count, hash, key_equal(), alloc) {}
+
+ raw_hash_set(size_t bucket_count, const allocator_type& alloc)
+ : raw_hash_set(bucket_count, hasher(), key_equal(), alloc) {}
+
+ explicit raw_hash_set(const allocator_type& alloc)
+ : raw_hash_set(0, hasher(), key_equal(), alloc) {}
+
+ template <class InputIter>
+ raw_hash_set(InputIter first, InputIter last, size_t bucket_count = 0,
+ const hasher& hash = hasher(), const key_equal& eq = key_equal(),
+ const allocator_type& alloc = allocator_type())
+ : raw_hash_set(bucket_count, hash, eq, alloc) {
+ insert(first, last);
+ }
+
+ template <class InputIter>
+ raw_hash_set(InputIter first, InputIter last, size_t bucket_count,
+ const hasher& hash, const allocator_type& alloc)
+ : raw_hash_set(first, last, bucket_count, hash, key_equal(), alloc) {}
+
+ template <class InputIter>
+ raw_hash_set(InputIter first, InputIter last, size_t bucket_count,
+ const allocator_type& alloc)
+ : raw_hash_set(first, last, bucket_count, hasher(), key_equal(), alloc) {}
+
+ template <class InputIter>
+ raw_hash_set(InputIter first, InputIter last, const allocator_type& alloc)
+ : raw_hash_set(first, last, 0, hasher(), key_equal(), alloc) {}
+
+ // Instead of accepting std::initializer_list<value_type> as the first
+ // argument like std::unordered_set<value_type> does, we have two overloads
+ // that accept std::initializer_list<T> and std::initializer_list<init_type>.
+ // This is advantageous for performance.
+ //
+ // // Turns {"abc", "def"} into std::initializer_list<std::string>, then
+ // // copies the strings into the set.
+ // std::unordered_set<std::string> s = {"abc", "def"};
+ //
+ // // Turns {"abc", "def"} into std::initializer_list<const char*>, then
+ // // copies the strings into the set.
+ // absl::flat_hash_set<std::string> s = {"abc", "def"};
+ //
+ // The same trick is used in insert().
+ //
+ // The enabler is necessary to prevent this constructor from triggering where
+ // the copy constructor is meant to be called.
+ //
+ // absl::flat_hash_set<int> a, b{a};
+ //
+ // RequiresNotInit<T> is a workaround for gcc prior to 7.1.
+ template <class T, RequiresNotInit<T> = 0, RequiresInsertable<T> = 0>
+ raw_hash_set(std::initializer_list<T> init, size_t bucket_count = 0,
+ const hasher& hash = hasher(), const key_equal& eq = key_equal(),
+ const allocator_type& alloc = allocator_type())
+ : raw_hash_set(init.begin(), init.end(), bucket_count, hash, eq, alloc) {}
+
+ raw_hash_set(std::initializer_list<init_type> init, size_t bucket_count = 0,
+ const hasher& hash = hasher(), const key_equal& eq = key_equal(),
+ const allocator_type& alloc = allocator_type())
+ : raw_hash_set(init.begin(), init.end(), bucket_count, hash, eq, alloc) {}
+
+ template <class T, RequiresNotInit<T> = 0, RequiresInsertable<T> = 0>
+ raw_hash_set(std::initializer_list<T> init, size_t bucket_count,
+ const hasher& hash, const allocator_type& alloc)
+ : raw_hash_set(init, bucket_count, hash, key_equal(), alloc) {}
+
+ raw_hash_set(std::initializer_list<init_type> init, size_t bucket_count,
+ const hasher& hash, const allocator_type& alloc)
+ : raw_hash_set(init, bucket_count, hash, key_equal(), alloc) {}
+
+ template <class T, RequiresNotInit<T> = 0, RequiresInsertable<T> = 0>
+ raw_hash_set(std::initializer_list<T> init, size_t bucket_count,
+ const allocator_type& alloc)
+ : raw_hash_set(init, bucket_count, hasher(), key_equal(), alloc) {}
+
+ raw_hash_set(std::initializer_list<init_type> init, size_t bucket_count,
+ const allocator_type& alloc)
+ : raw_hash_set(init, bucket_count, hasher(), key_equal(), alloc) {}
+
+ template <class T, RequiresNotInit<T> = 0, RequiresInsertable<T> = 0>
+ raw_hash_set(std::initializer_list<T> init, const allocator_type& alloc)
+ : raw_hash_set(init, 0, hasher(), key_equal(), alloc) {}
+
+ raw_hash_set(std::initializer_list<init_type> init,
+ const allocator_type& alloc)
+ : raw_hash_set(init, 0, hasher(), key_equal(), alloc) {}
+
+ raw_hash_set(const raw_hash_set& that)
+ : raw_hash_set(that, AllocTraits::select_on_container_copy_construction(
+ that.alloc_ref())) {}
+
+ raw_hash_set(const raw_hash_set& that, const allocator_type& a)
+ : raw_hash_set(0, that.hash_ref(), that.eq_ref(), a) {
+ reserve(that.size());
+ // Because the table is guaranteed to be empty, we can do something faster
+ // than a full `insert`.
+ for (const auto& v : that) {
+ const size_t hash = PolicyTraits::apply(HashElement{hash_ref()}, v);
+ auto target = find_first_non_full(ctrl_, hash, capacity_);
+ set_ctrl(target.offset, H2(hash));
+ emplace_at(target.offset, v);
+ infoz_.RecordInsert(hash, target.probe_length);
+ }
+ size_ = that.size();
+ growth_left() -= that.size();
+ }
+
+ raw_hash_set(raw_hash_set&& that) noexcept(
+ std::is_nothrow_copy_constructible<hasher>::value&&
+ std::is_nothrow_copy_constructible<key_equal>::value&&
+ std::is_nothrow_copy_constructible<allocator_type>::value)
+ : ctrl_(absl::exchange(that.ctrl_, EmptyGroup())),
+ slots_(absl::exchange(that.slots_, nullptr)),
+ size_(absl::exchange(that.size_, 0)),
+ capacity_(absl::exchange(that.capacity_, 0)),
+ infoz_(absl::exchange(that.infoz_, HashtablezInfoHandle())),
+ // Hash, equality and allocator are copied instead of moved because
+ // `that` must be left valid. If Hash is std::function<Key>, moving it
+ // would create a nullptr functor that cannot be called.
+ settings_(that.settings_) {
+ // growth_left was copied above, reset the one from `that`.
+ that.growth_left() = 0;
+ }
+
+ raw_hash_set(raw_hash_set&& that, const allocator_type& a)
+ : ctrl_(EmptyGroup()),
+ slots_(nullptr),
+ size_(0),
+ capacity_(0),
+ settings_(0, that.hash_ref(), that.eq_ref(), a) {
+ if (a == that.alloc_ref()) {
+ std::swap(ctrl_, that.ctrl_);
+ std::swap(slots_, that.slots_);
+ std::swap(size_, that.size_);
+ std::swap(capacity_, that.capacity_);
+ std::swap(growth_left(), that.growth_left());
+ std::swap(infoz_, that.infoz_);
+ } else {
+ reserve(that.size());
+ // Note: this will copy elements of dense_set and unordered_set instead of
+ // moving them. This can be fixed if it ever becomes an issue.
+ for (auto& elem : that) insert(std::move(elem));
+ }
+ }
+
+ raw_hash_set& operator=(const raw_hash_set& that) {
+ raw_hash_set tmp(that,
+ AllocTraits::propagate_on_container_copy_assignment::value
+ ? that.alloc_ref()
+ : alloc_ref());
+ swap(tmp);
+ return *this;
+ }
+
+ raw_hash_set& operator=(raw_hash_set&& that) noexcept(
+ absl::allocator_traits<allocator_type>::is_always_equal::value&&
+ std::is_nothrow_move_assignable<hasher>::value&&
+ std::is_nothrow_move_assignable<key_equal>::value) {
+ // TODO(sbenza): We should only use the operations from the noexcept clause
+ // to make sure we actually adhere to that contract.
+ return move_assign(
+ std::move(that),
+ typename AllocTraits::propagate_on_container_move_assignment());
+ }
+
+ ~raw_hash_set() { destroy_slots(); }
+
+ iterator begin() {
+ auto it = iterator_at(0);
+ it.skip_empty_or_deleted();
+ return it;
+ }
+ iterator end() { return {}; }
+
+ const_iterator begin() const {
+ return const_cast<raw_hash_set*>(this)->begin();
+ }
+ const_iterator end() const { return {}; }
+ const_iterator cbegin() const { return begin(); }
+ const_iterator cend() const { return end(); }
+
+ bool empty() const { return !size(); }
+ size_t size() const { return size_; }
+ size_t capacity() const { return capacity_; }
+ size_t max_size() const { return (std::numeric_limits<size_t>::max)(); }
+
+ ABSL_ATTRIBUTE_REINITIALIZES void clear() {
+ // Iterating over this container is O(bucket_count()). When bucket_count()
+ // is much greater than size(), iteration becomes prohibitively expensive.
+ // For clear() it is more important to reuse the allocated array when the
+ // container is small because allocation takes comparatively long time
+ // compared to destruction of the elements of the container. So we pick the
+ // largest bucket_count() threshold for which iteration is still fast and
+ // past that we simply deallocate the array.
+ if (capacity_ > 127) {
+ destroy_slots();
+ } else if (capacity_) {
+ for (size_t i = 0; i != capacity_; ++i) {
+ if (IsFull(ctrl_[i])) {
+ PolicyTraits::destroy(&alloc_ref(), slots_ + i);
+ }
+ }
+ size_ = 0;
+ reset_ctrl();
+ reset_growth_left();
+ }
+ assert(empty());
+ infoz_.RecordStorageChanged(0, capacity_);
+ }
+
+ // This overload kicks in when the argument is an rvalue of insertable and
+ // decomposable type other than init_type.
+ //
+ // flat_hash_map<std::string, int> m;
+ // m.insert(std::make_pair("abc", 42));
+ // TODO(cheshire): A type alias T2 is introduced as a workaround for the nvcc
+ // bug.
+ template <class T, RequiresInsertable<T> = 0,
+ class T2 = T,
+ typename std::enable_if<IsDecomposable<T2>::value, int>::type = 0,
+ T* = nullptr>
+ std::pair<iterator, bool> insert(T&& value) {
+ return emplace(std::forward<T>(value));
+ }
+
+ // This overload kicks in when the argument is a bitfield or an lvalue of
+ // insertable and decomposable type.
+ //
+ // union { int n : 1; };
+ // flat_hash_set<int> s;
+ // s.insert(n);
+ //
+ // flat_hash_set<std::string> s;
+ // const char* p = "hello";
+ // s.insert(p);
+ //
+ // TODO(romanp): Once we stop supporting gcc 5.1 and below, replace
+ // RequiresInsertable<T> with RequiresInsertable<const T&>.
+ // We are hitting this bug: https://godbolt.org/g/1Vht4f.
+ template <
+ class T, RequiresInsertable<T> = 0,
+ typename std::enable_if<IsDecomposable<const T&>::value, int>::type = 0>
+ std::pair<iterator, bool> insert(const T& value) {
+ return emplace(value);
+ }
+
+ // This overload kicks in when the argument is an rvalue of init_type. Its
+ // purpose is to handle brace-init-list arguments.
+ //
+ // flat_hash_map<std::string, int> s;
+ // s.insert({"abc", 42});
+ std::pair<iterator, bool> insert(init_type&& value) {
+ return emplace(std::move(value));
+ }
+
+ // TODO(cheshire): A type alias T2 is introduced as a workaround for the nvcc
+ // bug.
+ template <class T, RequiresInsertable<T> = 0, class T2 = T,
+ typename std::enable_if<IsDecomposable<T2>::value, int>::type = 0,
+ T* = nullptr>
+ iterator insert(const_iterator, T&& value) {
+ return insert(std::forward<T>(value)).first;
+ }
+
+ // TODO(romanp): Once we stop supporting gcc 5.1 and below, replace
+ // RequiresInsertable<T> with RequiresInsertable<const T&>.
+ // We are hitting this bug: https://godbolt.org/g/1Vht4f.
+ template <
+ class T, RequiresInsertable<T> = 0,
+ typename std::enable_if<IsDecomposable<const T&>::value, int>::type = 0>
+ iterator insert(const_iterator, const T& value) {
+ return insert(value).first;
+ }
+
+ iterator insert(const_iterator, init_type&& value) {
+ return insert(std::move(value)).first;
+ }
+
+ template <class InputIt>
+ void insert(InputIt first, InputIt last) {
+ for (; first != last; ++first) insert(*first);
+ }
+
+ template <class T, RequiresNotInit<T> = 0, RequiresInsertable<const T&> = 0>
+ void insert(std::initializer_list<T> ilist) {
+ insert(ilist.begin(), ilist.end());
+ }
+
+ void insert(std::initializer_list<init_type> ilist) {
+ insert(ilist.begin(), ilist.end());
+ }
+
+ insert_return_type insert(node_type&& node) {
+ if (!node) return {end(), false, node_type()};
+ const auto& elem = PolicyTraits::element(CommonAccess::GetSlot(node));
+ auto res = PolicyTraits::apply(
+ InsertSlot<false>{*this, std::move(*CommonAccess::GetSlot(node))},
+ elem);
+ if (res.second) {
+ CommonAccess::Reset(&node);
+ return {res.first, true, node_type()};
+ } else {
+ return {res.first, false, std::move(node)};
+ }
+ }
+
+ iterator insert(const_iterator, node_type&& node) {
+ auto res = insert(std::move(node));
+ node = std::move(res.node);
+ return res.position;
+ }
+
+ // This overload kicks in if we can deduce the key from args. This enables us
+ // to avoid constructing value_type if an entry with the same key already
+ // exists.
+ //
+ // For example:
+ //
+ // flat_hash_map<std::string, std::string> m = {{"abc", "def"}};
+ // // Creates no std::string copies and makes no heap allocations.
+ // m.emplace("abc", "xyz");
+ template <class... Args, typename std::enable_if<
+ IsDecomposable<Args...>::value, int>::type = 0>
+ std::pair<iterator, bool> emplace(Args&&... args) {
+ return PolicyTraits::apply(EmplaceDecomposable{*this},
+ std::forward<Args>(args)...);
+ }
+
+ // This overload kicks in if we cannot deduce the key from args. It constructs
+ // value_type unconditionally and then either moves it into the table or
+ // destroys.
+ template <class... Args, typename std::enable_if<
+ !IsDecomposable<Args...>::value, int>::type = 0>
+ std::pair<iterator, bool> emplace(Args&&... args) {
+ alignas(slot_type) unsigned char raw[sizeof(slot_type)];
+ slot_type* slot = reinterpret_cast<slot_type*>(&raw);
+
+ PolicyTraits::construct(&alloc_ref(), slot, std::forward<Args>(args)...);
+ const auto& elem = PolicyTraits::element(slot);
+ return PolicyTraits::apply(InsertSlot<true>{*this, std::move(*slot)}, elem);
+ }
+
+ template <class... Args>
+ iterator emplace_hint(const_iterator, Args&&... args) {
+ return emplace(std::forward<Args>(args)...).first;
+ }
+
+ // Extension API: support for lazy emplace.
+ //
+ // Looks up key in the table. If found, returns the iterator to the element.
+ // Otherwise calls `f` with one argument of type `raw_hash_set::constructor`.
+ //
+ // `f` must abide by several restrictions:
+ // - it MUST call `raw_hash_set::constructor` with arguments as if a
+ // `raw_hash_set::value_type` is constructed,
+ // - it MUST NOT access the container before the call to
+ // `raw_hash_set::constructor`, and
+ // - it MUST NOT erase the lazily emplaced element.
+ // Doing any of these is undefined behavior.
+ //
+ // For example:
+ //
+ // std::unordered_set<ArenaString> s;
+ // // Makes ArenaStr even if "abc" is in the map.
+ // s.insert(ArenaString(&arena, "abc"));
+ //
+ // flat_hash_set<ArenaStr> s;
+ // // Makes ArenaStr only if "abc" is not in the map.
+ // s.lazy_emplace("abc", [&](const constructor& ctor) {
+ // ctor(&arena, "abc");
+ // });
+ //
+ // WARNING: This API is currently experimental. If there is a way to implement
+ // the same thing with the rest of the API, prefer that.
+ class constructor {
+ friend class raw_hash_set;
+
+ public:
+ template <class... Args>
+ void operator()(Args&&... args) const {
+ assert(*slot_);
+ PolicyTraits::construct(alloc_, *slot_, std::forward<Args>(args)...);
+ *slot_ = nullptr;
+ }
+
+ private:
+ constructor(allocator_type* a, slot_type** slot) : alloc_(a), slot_(slot) {}
+
+ allocator_type* alloc_;
+ slot_type** slot_;
+ };
+
+ template <class K = key_type, class F>
+ iterator lazy_emplace(const key_arg<K>& key, F&& f) {
+ auto res = find_or_prepare_insert(key);
+ if (res.second) {
+ slot_type* slot = slots_ + res.first;
+ std::forward<F>(f)(constructor(&alloc_ref(), &slot));
+ assert(!slot);
+ }
+ return iterator_at(res.first);
+ }
+
+ // Extension API: support for heterogeneous keys.
+ //
+ // std::unordered_set<std::string> s;
+ // // Turns "abc" into std::string.
+ // s.erase("abc");
+ //
+ // flat_hash_set<std::string> s;
+ // // Uses "abc" directly without copying it into std::string.
+ // s.erase("abc");
+ template <class K = key_type>
+ size_type erase(const key_arg<K>& key) {
+ auto it = find(key);
+ if (it == end()) return 0;
+ erase(it);
+ return 1;
+ }
+
+ // Erases the element pointed to by `it`. Unlike `std::unordered_set::erase`,
+ // this method returns void to reduce algorithmic complexity to O(1). The
+ // iterator is invalidated, so any increment should be done before calling
+ // erase. In order to erase while iterating across a map, use the following
+ // idiom (which also works for standard containers):
+ //
+ // for (auto it = m.begin(), end = m.end(); it != end;) {
+ // // `erase()` will invalidate `it`, so advance `it` first.
+ // auto copy_it = it++;
+ // if (<pred>) {
+ // m.erase(copy_it);
+ // }
+ // }
+ void erase(const_iterator cit) { erase(cit.inner_); }
+
+ // This overload is necessary because otherwise erase<K>(const K&) would be
+ // a better match if non-const iterator is passed as an argument.
+ void erase(iterator it) {
+ AssertIsFull(it.ctrl_);
+ PolicyTraits::destroy(&alloc_ref(), it.slot_);
+ erase_meta_only(it);
+ }
+
+ iterator erase(const_iterator first, const_iterator last) {
+ while (first != last) {
+ erase(first++);
+ }
+ return last.inner_;
+ }
+
+ // Moves elements from `src` into `this`.
+ // If the element already exists in `this`, it is left unmodified in `src`.
+ template <typename H, typename E>
+ void merge(raw_hash_set<Policy, H, E, Alloc>& src) { // NOLINT
+ assert(this != &src);
+ for (auto it = src.begin(), e = src.end(); it != e;) {
+ auto next = std::next(it);
+ if (PolicyTraits::apply(InsertSlot<false>{*this, std::move(*it.slot_)},
+ PolicyTraits::element(it.slot_))
+ .second) {
+ src.erase_meta_only(it);
+ }
+ it = next;
+ }
+ }
+
+ template <typename H, typename E>
+ void merge(raw_hash_set<Policy, H, E, Alloc>&& src) {
+ merge(src);
+ }
+
+ node_type extract(const_iterator position) {
+ AssertIsFull(position.inner_.ctrl_);
+ auto node =
+ CommonAccess::Transfer<node_type>(alloc_ref(), position.inner_.slot_);
+ erase_meta_only(position);
+ return node;
+ }
+
+ template <
+ class K = key_type,
+ typename std::enable_if<!std::is_same<K, iterator>::value, int>::type = 0>
+ node_type extract(const key_arg<K>& key) {
+ auto it = find(key);
+ return it == end() ? node_type() : extract(const_iterator{it});
+ }
+
+ void swap(raw_hash_set& that) noexcept(
+ IsNoThrowSwappable<hasher>() && IsNoThrowSwappable<key_equal>() &&
+ IsNoThrowSwappable<allocator_type>(
+ typename AllocTraits::propagate_on_container_swap{})) {
+ using std::swap;
+ swap(ctrl_, that.ctrl_);
+ swap(slots_, that.slots_);
+ swap(size_, that.size_);
+ swap(capacity_, that.capacity_);
+ swap(growth_left(), that.growth_left());
+ swap(hash_ref(), that.hash_ref());
+ swap(eq_ref(), that.eq_ref());
+ swap(infoz_, that.infoz_);
+ SwapAlloc(alloc_ref(), that.alloc_ref(),
+ typename AllocTraits::propagate_on_container_swap{});
+ }
+
+ void rehash(size_t n) {
+ if (n == 0 && capacity_ == 0) return;
+ if (n == 0 && size_ == 0) {
+ destroy_slots();
+ infoz_.RecordStorageChanged(0, 0);
+ return;
+ }
+ // bitor is a faster way of doing `max` here. We will round up to the next
+ // power-of-2-minus-1, so bitor is good enough.
+ auto m = NormalizeCapacity(n | GrowthToLowerboundCapacity(size()));
+ // n == 0 unconditionally rehashes as per the standard.
+ if (n == 0 || m > capacity_) {
+ resize(m);
+ }
+ }
+
+ void reserve(size_t n) {
+ size_t m = GrowthToLowerboundCapacity(n);
+ if (m > capacity_) {
+ resize(NormalizeCapacity(m));
+ }
+ }
+
+ // Extension API: support for heterogeneous keys.
+ //
+ // std::unordered_set<std::string> s;
+ // // Turns "abc" into std::string.
+ // s.count("abc");
+ //
+ // ch_set<std::string> s;
+ // // Uses "abc" directly without copying it into std::string.
+ // s.count("abc");
+ template <class K = key_type>
+ size_t count(const key_arg<K>& key) const {
+ return find(key) == end() ? 0 : 1;
+ }
+
+ // Issues CPU prefetch instructions for the memory needed to find or insert
+ // a key. Like all lookup functions, this support heterogeneous keys.
+ //
+ // NOTE: This is a very low level operation and should not be used without
+ // specific benchmarks indicating its importance.
+ template <class K = key_type>
+ void prefetch(const key_arg<K>& key) const {
+ (void)key;
+#if defined(__GNUC__)
+ auto seq = probe(ctrl_, hash_ref()(key), capacity_);
+ __builtin_prefetch(static_cast<const void*>(ctrl_ + seq.offset()));
+ __builtin_prefetch(static_cast<const void*>(slots_ + seq.offset()));
+#endif // __GNUC__
+ }
+
+ // The API of find() has two extensions.
+ //
+ // 1. The hash can be passed by the user. It must be equal to the hash of the
+ // key.
+ //
+ // 2. The type of the key argument doesn't have to be key_type. This is so
+ // called heterogeneous key support.
+ template <class K = key_type>
+ iterator find(const key_arg<K>& key, size_t hash) {
+ auto seq = probe(ctrl_, hash, capacity_);
+ while (true) {
+ Group g{ctrl_ + seq.offset()};
+ for (int i : g.Match(H2(hash))) {
+ if (ABSL_PREDICT_TRUE(PolicyTraits::apply(
+ EqualElement<K>{key, eq_ref()},
+ PolicyTraits::element(slots_ + seq.offset(i)))))
+ return iterator_at(seq.offset(i));
+ }
+ if (ABSL_PREDICT_TRUE(g.MatchEmpty())) return end();
+ seq.next();
+ assert(seq.index() < capacity_ && "full table!");
+ }
+ }
+ template <class K = key_type>
+ iterator find(const key_arg<K>& key) {
+ return find(key, hash_ref()(key));
+ }
+
+ template <class K = key_type>
+ const_iterator find(const key_arg<K>& key, size_t hash) const {
+ return const_cast<raw_hash_set*>(this)->find(key, hash);
+ }
+ template <class K = key_type>
+ const_iterator find(const key_arg<K>& key) const {
+ return find(key, hash_ref()(key));
+ }
+
+ template <class K = key_type>
+ bool contains(const key_arg<K>& key) const {
+ return find(key) != end();
+ }
+
+ template <class K = key_type>
+ std::pair<iterator, iterator> equal_range(const key_arg<K>& key) {
+ auto it = find(key);
+ if (it != end()) return {it, std::next(it)};
+ return {it, it};
+ }
+ template <class K = key_type>
+ std::pair<const_iterator, const_iterator> equal_range(
+ const key_arg<K>& key) const {
+ auto it = find(key);
+ if (it != end()) return {it, std::next(it)};
+ return {it, it};
+ }
+
+ size_t bucket_count() const { return capacity_; }
+ float load_factor() const {
+ return capacity_ ? static_cast<double>(size()) / capacity_ : 0.0;
+ }
+ float max_load_factor() const { return 1.0f; }
+ void max_load_factor(float) {
+ // Does nothing.
+ }
+
+ hasher hash_function() const { return hash_ref(); }
+ key_equal key_eq() const { return eq_ref(); }
+ allocator_type get_allocator() const { return alloc_ref(); }
+
+ friend bool operator==(const raw_hash_set& a, const raw_hash_set& b) {
+ if (a.size() != b.size()) return false;
+ const raw_hash_set* outer = &a;
+ const raw_hash_set* inner = &b;
+ if (outer->capacity() > inner->capacity()) std::swap(outer, inner);
+ for (const value_type& elem : *outer)
+ if (!inner->has_element(elem)) return false;
+ return true;
+ }
+
+ friend bool operator!=(const raw_hash_set& a, const raw_hash_set& b) {
+ return !(a == b);
+ }
+
+ friend void swap(raw_hash_set& a,
+ raw_hash_set& b) noexcept(noexcept(a.swap(b))) {
+ a.swap(b);
+ }
+
+ private:
+ template <class Container, typename Enabler>
+ friend struct absl::container_internal::hashtable_debug_internal::
+ HashtableDebugAccess;
+
+ struct FindElement {
+ template <class K, class... Args>
+ const_iterator operator()(const K& key, Args&&...) const {
+ return s.find(key);
+ }
+ const raw_hash_set& s;
+ };
+
+ struct HashElement {
+ template <class K, class... Args>
+ size_t operator()(const K& key, Args&&...) const {
+ return h(key);
+ }
+ const hasher& h;
+ };
+
+ template <class K1>
+ struct EqualElement {
+ template <class K2, class... Args>
+ bool operator()(const K2& lhs, Args&&...) const {
+ return eq(lhs, rhs);
+ }
+ const K1& rhs;
+ const key_equal& eq;
+ };
+
+ struct EmplaceDecomposable {
+ template <class K, class... Args>
+ std::pair<iterator, bool> operator()(const K& key, Args&&... args) const {
+ auto res = s.find_or_prepare_insert(key);
+ if (res.second) {
+ s.emplace_at(res.first, std::forward<Args>(args)...);
+ }
+ return {s.iterator_at(res.first), res.second};
+ }
+ raw_hash_set& s;
+ };
+
+ template <bool do_destroy>
+ struct InsertSlot {
+ template <class K, class... Args>
+ std::pair<iterator, bool> operator()(const K& key, Args&&...) && {
+ auto res = s.find_or_prepare_insert(key);
+ if (res.second) {
+ PolicyTraits::transfer(&s.alloc_ref(), s.slots_ + res.first, &slot);
+ } else if (do_destroy) {
+ PolicyTraits::destroy(&s.alloc_ref(), &slot);
+ }
+ return {s.iterator_at(res.first), res.second};
+ }
+ raw_hash_set& s;
+ // Constructed slot. Either moved into place or destroyed.
+ slot_type&& slot;
+ };
+
+ // "erases" the object from the container, except that it doesn't actually
+ // destroy the object. It only updates all the metadata of the class.
+ // This can be used in conjunction with Policy::transfer to move the object to
+ // another place.
+ void erase_meta_only(const_iterator it) {
+ assert(IsFull(*it.inner_.ctrl_) && "erasing a dangling iterator");
+ --size_;
+ const size_t index = it.inner_.ctrl_ - ctrl_;
+ const size_t index_before = (index - Group::kWidth) & capacity_;
+ const auto empty_after = Group(it.inner_.ctrl_).MatchEmpty();
+ const auto empty_before = Group(ctrl_ + index_before).MatchEmpty();
+
+ // We count how many consecutive non empties we have to the right and to the
+ // left of `it`. If the sum is >= kWidth then there is at least one probe
+ // window that might have seen a full group.
+ bool was_never_full =
+ empty_before && empty_after &&
+ static_cast<size_t>(empty_after.TrailingZeros() +
+ empty_before.LeadingZeros()) < Group::kWidth;
+
+ set_ctrl(index, was_never_full ? kEmpty : kDeleted);
+ growth_left() += was_never_full;
+ infoz_.RecordErase();
+ }
+
+ void initialize_slots() {
+ assert(capacity_);
+ // Folks with custom allocators often make unwarranted assumptions about the
+ // behavior of their classes vis-a-vis trivial destructability and what
+ // calls they will or wont make. Avoid sampling for people with custom
+ // allocators to get us out of this mess. This is not a hard guarantee but
+ // a workaround while we plan the exact guarantee we want to provide.
+ //
+ // People are often sloppy with the exact type of their allocator (sometimes
+ // it has an extra const or is missing the pair, but rebinds made it work
+ // anyway). To avoid the ambiguity, we work off SlotAlloc which we have
+ // bound more carefully.
+ if (std::is_same<SlotAlloc, std::allocator<slot_type>>::value &&
+ slots_ == nullptr) {
+ infoz_ = Sample();
+ }
+
+ auto layout = MakeLayout(capacity_);
+ char* mem = static_cast<char*>(
+ Allocate<Layout::Alignment()>(&alloc_ref(), layout.AllocSize()));
+ ctrl_ = reinterpret_cast<ctrl_t*>(layout.template Pointer<0>(mem));
+ slots_ = layout.template Pointer<1>(mem);
+ reset_ctrl();
+ reset_growth_left();
+ infoz_.RecordStorageChanged(size_, capacity_);
+ }
+
+ void destroy_slots() {
+ if (!capacity_) return;
+ for (size_t i = 0; i != capacity_; ++i) {
+ if (IsFull(ctrl_[i])) {
+ PolicyTraits::destroy(&alloc_ref(), slots_ + i);
+ }
+ }
+ auto layout = MakeLayout(capacity_);
+ // Unpoison before returning the memory to the allocator.
+ SanitizerUnpoisonMemoryRegion(slots_, sizeof(slot_type) * capacity_);
+ Deallocate<Layout::Alignment()>(&alloc_ref(), ctrl_, layout.AllocSize());
+ ctrl_ = EmptyGroup();
+ slots_ = nullptr;
+ size_ = 0;
+ capacity_ = 0;
+ growth_left() = 0;
+ }
+
+ void resize(size_t new_capacity) {
+ assert(IsValidCapacity(new_capacity));
+ auto* old_ctrl = ctrl_;
+ auto* old_slots = slots_;
+ const size_t old_capacity = capacity_;
+ capacity_ = new_capacity;
+ initialize_slots();
+
+ size_t total_probe_length = 0;
+ for (size_t i = 0; i != old_capacity; ++i) {
+ if (IsFull(old_ctrl[i])) {
+ size_t hash = PolicyTraits::apply(HashElement{hash_ref()},
+ PolicyTraits::element(old_slots + i));
+ auto target = find_first_non_full(ctrl_, hash, capacity_);
+ size_t new_i = target.offset;
+ total_probe_length += target.probe_length;
+ set_ctrl(new_i, H2(hash));
+ PolicyTraits::transfer(&alloc_ref(), slots_ + new_i, old_slots + i);
+ }
+ }
+ if (old_capacity) {
+ SanitizerUnpoisonMemoryRegion(old_slots,
+ sizeof(slot_type) * old_capacity);
+ auto layout = MakeLayout(old_capacity);
+ Deallocate<Layout::Alignment()>(&alloc_ref(), old_ctrl,
+ layout.AllocSize());
+ }
+ infoz_.RecordRehash(total_probe_length);
+ }
+
+ void drop_deletes_without_resize() ABSL_ATTRIBUTE_NOINLINE {
+ assert(IsValidCapacity(capacity_));
+ assert(!is_small(capacity_));
+ // Algorithm:
+ // - mark all DELETED slots as EMPTY
+ // - mark all FULL slots as DELETED
+ // - for each slot marked as DELETED
+ // hash = Hash(element)
+ // target = find_first_non_full(hash)
+ // if target is in the same group
+ // mark slot as FULL
+ // else if target is EMPTY
+ // transfer element to target
+ // mark slot as EMPTY
+ // mark target as FULL
+ // else if target is DELETED
+ // swap current element with target element
+ // mark target as FULL
+ // repeat procedure for current slot with moved from element (target)
+ ConvertDeletedToEmptyAndFullToDeleted(ctrl_, capacity_);
+ alignas(slot_type) unsigned char raw[sizeof(slot_type)];
+ size_t total_probe_length = 0;
+ slot_type* slot = reinterpret_cast<slot_type*>(&raw);
+ for (size_t i = 0; i != capacity_; ++i) {
+ if (!IsDeleted(ctrl_[i])) continue;
+ size_t hash = PolicyTraits::apply(HashElement{hash_ref()},
+ PolicyTraits::element(slots_ + i));
+ auto target = find_first_non_full(ctrl_, hash, capacity_);
+ size_t new_i = target.offset;
+ total_probe_length += target.probe_length;
+
+ // Verify if the old and new i fall within the same group wrt the hash.
+ // If they do, we don't need to move the object as it falls already in the
+ // best probe we can.
+ const auto probe_index = [&](size_t pos) {
+ return ((pos - probe(ctrl_, hash, capacity_).offset()) & capacity_) /
+ Group::kWidth;
+ };
+
+ // Element doesn't move.
+ if (ABSL_PREDICT_TRUE(probe_index(new_i) == probe_index(i))) {
+ set_ctrl(i, H2(hash));
+ continue;
+ }
+ if (IsEmpty(ctrl_[new_i])) {
+ // Transfer element to the empty spot.
+ // set_ctrl poisons/unpoisons the slots so we have to call it at the
+ // right time.
+ set_ctrl(new_i, H2(hash));
+ PolicyTraits::transfer(&alloc_ref(), slots_ + new_i, slots_ + i);
+ set_ctrl(i, kEmpty);
+ } else {
+ assert(IsDeleted(ctrl_[new_i]));
+ set_ctrl(new_i, H2(hash));
+ // Until we are done rehashing, DELETED marks previously FULL slots.
+ // Swap i and new_i elements.
+ PolicyTraits::transfer(&alloc_ref(), slot, slots_ + i);
+ PolicyTraits::transfer(&alloc_ref(), slots_ + i, slots_ + new_i);
+ PolicyTraits::transfer(&alloc_ref(), slots_ + new_i, slot);
+ --i; // repeat
+ }
+ }
+ reset_growth_left();
+ infoz_.RecordRehash(total_probe_length);
+ }
+
+ void rehash_and_grow_if_necessary() {
+ if (capacity_ == 0) {
+ resize(1);
+ } else if (size() <= CapacityToGrowth(capacity()) / 2) {
+ // Squash DELETED without growing if there is enough capacity.
+ drop_deletes_without_resize();
+ } else {
+ // Otherwise grow the container.
+ resize(capacity_ * 2 + 1);
+ }
+ }
+
+ bool has_element(const value_type& elem) const {
+ size_t hash = PolicyTraits::apply(HashElement{hash_ref()}, elem);
+ auto seq = probe(ctrl_, hash, capacity_);
+ while (true) {
+ Group g{ctrl_ + seq.offset()};
+ for (int i : g.Match(H2(hash))) {
+ if (ABSL_PREDICT_TRUE(PolicyTraits::element(slots_ + seq.offset(i)) ==
+ elem))
+ return true;
+ }
+ if (ABSL_PREDICT_TRUE(g.MatchEmpty())) return false;
+ seq.next();
+ assert(seq.index() < capacity_ && "full table!");
+ }
+ return false;
+ }
+
+ // TODO(alkis): Optimize this assuming *this and that don't overlap.
+ raw_hash_set& move_assign(raw_hash_set&& that, std::true_type) {
+ raw_hash_set tmp(std::move(that));
+ swap(tmp);
+ return *this;
+ }
+ raw_hash_set& move_assign(raw_hash_set&& that, std::false_type) {
+ raw_hash_set tmp(std::move(that), alloc_ref());
+ swap(tmp);
+ return *this;
+ }
+
+ protected:
+ template <class K>
+ std::pair<size_t, bool> find_or_prepare_insert(const K& key) {
+ auto hash = hash_ref()(key);
+ auto seq = probe(ctrl_, hash, capacity_);
+ while (true) {
+ Group g{ctrl_ + seq.offset()};
+ for (int i : g.Match(H2(hash))) {
+ if (ABSL_PREDICT_TRUE(PolicyTraits::apply(
+ EqualElement<K>{key, eq_ref()},
+ PolicyTraits::element(slots_ + seq.offset(i)))))
+ return {seq.offset(i), false};
+ }
+ if (ABSL_PREDICT_TRUE(g.MatchEmpty())) break;
+ seq.next();
+ assert(seq.index() < capacity_ && "full table!");
+ }
+ return {prepare_insert(hash), true};
+ }
+
+ size_t prepare_insert(size_t hash) ABSL_ATTRIBUTE_NOINLINE {
+ auto target = find_first_non_full(ctrl_, hash, capacity_);
+ if (ABSL_PREDICT_FALSE(growth_left() == 0 &&
+ !IsDeleted(ctrl_[target.offset]))) {
+ rehash_and_grow_if_necessary();
+ target = find_first_non_full(ctrl_, hash, capacity_);
+ }
+ ++size_;
+ growth_left() -= IsEmpty(ctrl_[target.offset]);
+ set_ctrl(target.offset, H2(hash));
+ infoz_.RecordInsert(hash, target.probe_length);
+ return target.offset;
+ }
+
+ // Constructs the value in the space pointed by the iterator. This only works
+ // after an unsuccessful find_or_prepare_insert() and before any other
+ // modifications happen in the raw_hash_set.
+ //
+ // PRECONDITION: i is an index returned from find_or_prepare_insert(k), where
+ // k is the key decomposed from `forward<Args>(args)...`, and the bool
+ // returned by find_or_prepare_insert(k) was true.
+ // POSTCONDITION: *m.iterator_at(i) == value_type(forward<Args>(args)...).
+ template <class... Args>
+ void emplace_at(size_t i, Args&&... args) {
+ PolicyTraits::construct(&alloc_ref(), slots_ + i,
+ std::forward<Args>(args)...);
+
+ assert(PolicyTraits::apply(FindElement{*this}, *iterator_at(i)) ==
+ iterator_at(i) &&
+ "constructed value does not match the lookup key");
+ }
+
+ iterator iterator_at(size_t i) { return {ctrl_ + i, slots_ + i}; }
+ const_iterator iterator_at(size_t i) const { return {ctrl_ + i, slots_ + i}; }
+
+ private:
+ friend struct RawHashSetTestOnlyAccess;
+
+ // Reset all ctrl bytes back to kEmpty, except the sentinel.
+ void reset_ctrl() {
+ std::memset(ctrl_, kEmpty, capacity_ + Group::kWidth);
+ ctrl_[capacity_] = kSentinel;
+ SanitizerPoisonMemoryRegion(slots_, sizeof(slot_type) * capacity_);
+ }
+
+ void reset_growth_left() {
+ growth_left() = CapacityToGrowth(capacity()) - size_;
+ }
+
+ // Sets the control byte, and if `i < Group::kWidth`, set the cloned byte at
+ // the end too.
+ void set_ctrl(size_t i, ctrl_t h) {
+ assert(i < capacity_);
+
+ if (IsFull(h)) {
+ SanitizerUnpoisonObject(slots_ + i);
+ } else {
+ SanitizerPoisonObject(slots_ + i);
+ }
+
+ ctrl_[i] = h;
+ ctrl_[((i - Group::kWidth) & capacity_) + 1 +
+ ((Group::kWidth - 1) & capacity_)] = h;
+ }
+
+ size_t& growth_left() { return settings_.template get<0>(); }
+
+ hasher& hash_ref() { return settings_.template get<1>(); }
+ const hasher& hash_ref() const { return settings_.template get<1>(); }
+ key_equal& eq_ref() { return settings_.template get<2>(); }
+ const key_equal& eq_ref() const { return settings_.template get<2>(); }
+ allocator_type& alloc_ref() { return settings_.template get<3>(); }
+ const allocator_type& alloc_ref() const {
+ return settings_.template get<3>();
+ }
+
+ // TODO(alkis): Investigate removing some of these fields:
+ // - ctrl/slots can be derived from each other
+ // - size can be moved into the slot array
+ ctrl_t* ctrl_ = EmptyGroup(); // [(capacity + 1) * ctrl_t]
+ slot_type* slots_ = nullptr; // [capacity * slot_type]
+ size_t size_ = 0; // number of full slots
+ size_t capacity_ = 0; // total number of slots
+ HashtablezInfoHandle infoz_;
+ absl::container_internal::CompressedTuple<size_t /* growth_left */, hasher,
+ key_equal, allocator_type>
+ settings_{0, hasher{}, key_equal{}, allocator_type{}};
+};
+
+// Erases all elements that satisfy the predicate `pred` from the container `c`.
+template <typename P, typename H, typename E, typename A, typename Predicate>
+void EraseIf(Predicate pred, raw_hash_set<P, H, E, A>* c) {
+ for (auto it = c->begin(), last = c->end(); it != last;) {
+ auto copy_it = it++;
+ if (pred(*copy_it)) {
+ c->erase(copy_it);
+ }
+ }
+}
+
+namespace hashtable_debug_internal {
+template <typename Set>
+struct HashtableDebugAccess<Set, absl::void_t<typename Set::raw_hash_set>> {
+ using Traits = typename Set::PolicyTraits;
+ using Slot = typename Traits::slot_type;
+
+ static size_t GetNumProbes(const Set& set,
+ const typename Set::key_type& key) {
+ size_t num_probes = 0;
+ size_t hash = set.hash_ref()(key);
+ auto seq = probe(set.ctrl_, hash, set.capacity_);
+ while (true) {
+ container_internal::Group g{set.ctrl_ + seq.offset()};
+ for (int i : g.Match(container_internal::H2(hash))) {
+ if (Traits::apply(
+ typename Set::template EqualElement<typename Set::key_type>{
+ key, set.eq_ref()},
+ Traits::element(set.slots_ + seq.offset(i))))
+ return num_probes;
+ ++num_probes;
+ }
+ if (g.MatchEmpty()) return num_probes;
+ seq.next();
+ ++num_probes;
+ }
+ }
+
+ static size_t AllocatedByteSize(const Set& c) {
+ size_t capacity = c.capacity_;
+ if (capacity == 0) return 0;
+ auto layout = Set::MakeLayout(capacity);
+ size_t m = layout.AllocSize();
+
+ size_t per_slot = Traits::space_used(static_cast<const Slot*>(nullptr));
+ if (per_slot != ~size_t{}) {
+ m += per_slot * c.size();
+ } else {
+ for (size_t i = 0; i != capacity; ++i) {
+ if (container_internal::IsFull(c.ctrl_[i])) {
+ m += Traits::space_used(c.slots_ + i);
+ }
+ }
+ }
+ return m;
+ }
+
+ static size_t LowerBoundAllocatedByteSize(size_t size) {
+ size_t capacity = GrowthToLowerboundCapacity(size);
+ if (capacity == 0) return 0;
+ auto layout = Set::MakeLayout(NormalizeCapacity(capacity));
+ size_t m = layout.AllocSize();
+ size_t per_slot = Traits::space_used(static_cast<const Slot*>(nullptr));
+ if (per_slot != ~size_t{}) {
+ m += per_slot * size;
+ }
+ return m;
+ }
+};
+
+} // namespace hashtable_debug_internal
+} // namespace container_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_CONTAINER_INTERNAL_RAW_HASH_SET_H_
diff --git a/third_party/abseil/src/absl/container/internal/raw_hash_set_allocator_test.cc b/third_party/abseil/src/absl/container/internal/raw_hash_set_allocator_test.cc
new file mode 100644
index 0000000..e73f53f
--- /dev/null
+++ b/third_party/abseil/src/absl/container/internal/raw_hash_set_allocator_test.cc
@@ -0,0 +1,505 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <limits>
+#include <scoped_allocator>
+
+#include "gtest/gtest.h"
+#include "absl/container/internal/raw_hash_set.h"
+#include "absl/container/internal/tracked.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace container_internal {
+namespace {
+
+enum AllocSpec {
+ kPropagateOnCopy = 1,
+ kPropagateOnMove = 2,
+ kPropagateOnSwap = 4,
+};
+
+struct AllocState {
+ size_t num_allocs = 0;
+ std::set<void*> owned;
+};
+
+template <class T,
+ int Spec = kPropagateOnCopy | kPropagateOnMove | kPropagateOnSwap>
+class CheckedAlloc {
+ public:
+ template <class, int>
+ friend class CheckedAlloc;
+
+ using value_type = T;
+
+ CheckedAlloc() {}
+ explicit CheckedAlloc(size_t id) : id_(id) {}
+ CheckedAlloc(const CheckedAlloc&) = default;
+ CheckedAlloc& operator=(const CheckedAlloc&) = default;
+
+ template <class U>
+ CheckedAlloc(const CheckedAlloc<U, Spec>& that)
+ : id_(that.id_), state_(that.state_) {}
+
+ template <class U>
+ struct rebind {
+ using other = CheckedAlloc<U, Spec>;
+ };
+
+ using propagate_on_container_copy_assignment =
+ std::integral_constant<bool, (Spec & kPropagateOnCopy) != 0>;
+
+ using propagate_on_container_move_assignment =
+ std::integral_constant<bool, (Spec & kPropagateOnMove) != 0>;
+
+ using propagate_on_container_swap =
+ std::integral_constant<bool, (Spec & kPropagateOnSwap) != 0>;
+
+ CheckedAlloc select_on_container_copy_construction() const {
+ if (Spec & kPropagateOnCopy) return *this;
+ return {};
+ }
+
+ T* allocate(size_t n) {
+ T* ptr = std::allocator<T>().allocate(n);
+ track_alloc(ptr);
+ return ptr;
+ }
+ void deallocate(T* ptr, size_t n) {
+ memset(ptr, 0, n * sizeof(T)); // The freed memory must be unpoisoned.
+ track_dealloc(ptr);
+ return std::allocator<T>().deallocate(ptr, n);
+ }
+
+ friend bool operator==(const CheckedAlloc& a, const CheckedAlloc& b) {
+ return a.id_ == b.id_;
+ }
+ friend bool operator!=(const CheckedAlloc& a, const CheckedAlloc& b) {
+ return !(a == b);
+ }
+
+ size_t num_allocs() const { return state_->num_allocs; }
+
+ void swap(CheckedAlloc& that) {
+ using std::swap;
+ swap(id_, that.id_);
+ swap(state_, that.state_);
+ }
+
+ friend void swap(CheckedAlloc& a, CheckedAlloc& b) { a.swap(b); }
+
+ friend std::ostream& operator<<(std::ostream& o, const CheckedAlloc& a) {
+ return o << "alloc(" << a.id_ << ")";
+ }
+
+ private:
+ void track_alloc(void* ptr) {
+ AllocState* state = state_.get();
+ ++state->num_allocs;
+ if (!state->owned.insert(ptr).second)
+ ADD_FAILURE() << *this << " got previously allocated memory: " << ptr;
+ }
+ void track_dealloc(void* ptr) {
+ if (state_->owned.erase(ptr) != 1)
+ ADD_FAILURE() << *this
+ << " deleting memory owned by another allocator: " << ptr;
+ }
+
+ size_t id_ = std::numeric_limits<size_t>::max();
+
+ std::shared_ptr<AllocState> state_ = std::make_shared<AllocState>();
+};
+
+struct Identity {
+ int32_t operator()(int32_t v) const { return v; }
+};
+
+struct Policy {
+ using slot_type = Tracked<int32_t>;
+ using init_type = Tracked<int32_t>;
+ using key_type = int32_t;
+
+ template <class allocator_type, class... Args>
+ static void construct(allocator_type* alloc, slot_type* slot,
+ Args&&... args) {
+ std::allocator_traits<allocator_type>::construct(
+ *alloc, slot, std::forward<Args>(args)...);
+ }
+
+ template <class allocator_type>
+ static void destroy(allocator_type* alloc, slot_type* slot) {
+ std::allocator_traits<allocator_type>::destroy(*alloc, slot);
+ }
+
+ template <class allocator_type>
+ static void transfer(allocator_type* alloc, slot_type* new_slot,
+ slot_type* old_slot) {
+ construct(alloc, new_slot, std::move(*old_slot));
+ destroy(alloc, old_slot);
+ }
+
+ template <class F>
+ static auto apply(F&& f, int32_t v) -> decltype(std::forward<F>(f)(v, v)) {
+ return std::forward<F>(f)(v, v);
+ }
+
+ template <class F>
+ static auto apply(F&& f, const slot_type& v)
+ -> decltype(std::forward<F>(f)(v.val(), v)) {
+ return std::forward<F>(f)(v.val(), v);
+ }
+
+ template <class F>
+ static auto apply(F&& f, slot_type&& v)
+ -> decltype(std::forward<F>(f)(v.val(), std::move(v))) {
+ return std::forward<F>(f)(v.val(), std::move(v));
+ }
+
+ static slot_type& element(slot_type* slot) { return *slot; }
+};
+
+template <int Spec>
+struct PropagateTest : public ::testing::Test {
+ using Alloc = CheckedAlloc<Tracked<int32_t>, Spec>;
+
+ using Table = raw_hash_set<Policy, Identity, std::equal_to<int32_t>, Alloc>;
+
+ PropagateTest() {
+ EXPECT_EQ(a1, t1.get_allocator());
+ EXPECT_NE(a2, t1.get_allocator());
+ }
+
+ Alloc a1 = Alloc(1);
+ Table t1 = Table(0, a1);
+ Alloc a2 = Alloc(2);
+};
+
+using PropagateOnAll =
+ PropagateTest<kPropagateOnCopy | kPropagateOnMove | kPropagateOnSwap>;
+using NoPropagateOnCopy = PropagateTest<kPropagateOnMove | kPropagateOnSwap>;
+using NoPropagateOnMove = PropagateTest<kPropagateOnCopy | kPropagateOnSwap>;
+
+TEST_F(PropagateOnAll, Empty) { EXPECT_EQ(0, a1.num_allocs()); }
+
+TEST_F(PropagateOnAll, InsertAllocates) {
+ auto it = t1.insert(0).first;
+ EXPECT_EQ(1, a1.num_allocs());
+ EXPECT_EQ(0, it->num_moves());
+ EXPECT_EQ(0, it->num_copies());
+}
+
+TEST_F(PropagateOnAll, InsertDecomposes) {
+ auto it = t1.insert(0).first;
+ EXPECT_EQ(1, a1.num_allocs());
+ EXPECT_EQ(0, it->num_moves());
+ EXPECT_EQ(0, it->num_copies());
+
+ EXPECT_FALSE(t1.insert(0).second);
+ EXPECT_EQ(1, a1.num_allocs());
+ EXPECT_EQ(0, it->num_moves());
+ EXPECT_EQ(0, it->num_copies());
+}
+
+TEST_F(PropagateOnAll, RehashMoves) {
+ auto it = t1.insert(0).first;
+ EXPECT_EQ(0, it->num_moves());
+ t1.rehash(2 * t1.capacity());
+ EXPECT_EQ(2, a1.num_allocs());
+ it = t1.find(0);
+ EXPECT_EQ(1, it->num_moves());
+ EXPECT_EQ(0, it->num_copies());
+}
+
+TEST_F(PropagateOnAll, CopyConstructor) {
+ auto it = t1.insert(0).first;
+ Table u(t1);
+ EXPECT_EQ(2, a1.num_allocs());
+ EXPECT_EQ(0, it->num_moves());
+ EXPECT_EQ(1, it->num_copies());
+}
+
+TEST_F(NoPropagateOnCopy, CopyConstructor) {
+ auto it = t1.insert(0).first;
+ Table u(t1);
+ EXPECT_EQ(1, a1.num_allocs());
+ EXPECT_EQ(1, u.get_allocator().num_allocs());
+ EXPECT_EQ(0, it->num_moves());
+ EXPECT_EQ(1, it->num_copies());
+}
+
+TEST_F(PropagateOnAll, CopyConstructorWithSameAlloc) {
+ auto it = t1.insert(0).first;
+ Table u(t1, a1);
+ EXPECT_EQ(2, a1.num_allocs());
+ EXPECT_EQ(0, it->num_moves());
+ EXPECT_EQ(1, it->num_copies());
+}
+
+TEST_F(NoPropagateOnCopy, CopyConstructorWithSameAlloc) {
+ auto it = t1.insert(0).first;
+ Table u(t1, a1);
+ EXPECT_EQ(2, a1.num_allocs());
+ EXPECT_EQ(0, it->num_moves());
+ EXPECT_EQ(1, it->num_copies());
+}
+
+TEST_F(PropagateOnAll, CopyConstructorWithDifferentAlloc) {
+ auto it = t1.insert(0).first;
+ Table u(t1, a2);
+ EXPECT_EQ(a2, u.get_allocator());
+ EXPECT_EQ(1, a1.num_allocs());
+ EXPECT_EQ(1, a2.num_allocs());
+ EXPECT_EQ(0, it->num_moves());
+ EXPECT_EQ(1, it->num_copies());
+}
+
+TEST_F(NoPropagateOnCopy, CopyConstructorWithDifferentAlloc) {
+ auto it = t1.insert(0).first;
+ Table u(t1, a2);
+ EXPECT_EQ(a2, u.get_allocator());
+ EXPECT_EQ(1, a1.num_allocs());
+ EXPECT_EQ(1, a2.num_allocs());
+ EXPECT_EQ(0, it->num_moves());
+ EXPECT_EQ(1, it->num_copies());
+}
+
+TEST_F(PropagateOnAll, MoveConstructor) {
+ auto it = t1.insert(0).first;
+ Table u(std::move(t1));
+ EXPECT_EQ(1, a1.num_allocs());
+ EXPECT_EQ(0, it->num_moves());
+ EXPECT_EQ(0, it->num_copies());
+}
+
+TEST_F(NoPropagateOnMove, MoveConstructor) {
+ auto it = t1.insert(0).first;
+ Table u(std::move(t1));
+ EXPECT_EQ(1, a1.num_allocs());
+ EXPECT_EQ(0, it->num_moves());
+ EXPECT_EQ(0, it->num_copies());
+}
+
+TEST_F(PropagateOnAll, MoveConstructorWithSameAlloc) {
+ auto it = t1.insert(0).first;
+ Table u(std::move(t1), a1);
+ EXPECT_EQ(1, a1.num_allocs());
+ EXPECT_EQ(0, it->num_moves());
+ EXPECT_EQ(0, it->num_copies());
+}
+
+TEST_F(NoPropagateOnMove, MoveConstructorWithSameAlloc) {
+ auto it = t1.insert(0).first;
+ Table u(std::move(t1), a1);
+ EXPECT_EQ(1, a1.num_allocs());
+ EXPECT_EQ(0, it->num_moves());
+ EXPECT_EQ(0, it->num_copies());
+}
+
+TEST_F(PropagateOnAll, MoveConstructorWithDifferentAlloc) {
+ auto it = t1.insert(0).first;
+ Table u(std::move(t1), a2);
+ it = u.find(0);
+ EXPECT_EQ(a2, u.get_allocator());
+ EXPECT_EQ(1, a1.num_allocs());
+ EXPECT_EQ(1, a2.num_allocs());
+ EXPECT_EQ(1, it->num_moves());
+ EXPECT_EQ(0, it->num_copies());
+}
+
+TEST_F(NoPropagateOnMove, MoveConstructorWithDifferentAlloc) {
+ auto it = t1.insert(0).first;
+ Table u(std::move(t1), a2);
+ it = u.find(0);
+ EXPECT_EQ(a2, u.get_allocator());
+ EXPECT_EQ(1, a1.num_allocs());
+ EXPECT_EQ(1, a2.num_allocs());
+ EXPECT_EQ(1, it->num_moves());
+ EXPECT_EQ(0, it->num_copies());
+}
+
+TEST_F(PropagateOnAll, CopyAssignmentWithSameAlloc) {
+ auto it = t1.insert(0).first;
+ Table u(0, a1);
+ u = t1;
+ EXPECT_EQ(2, a1.num_allocs());
+ EXPECT_EQ(0, it->num_moves());
+ EXPECT_EQ(1, it->num_copies());
+}
+
+TEST_F(NoPropagateOnCopy, CopyAssignmentWithSameAlloc) {
+ auto it = t1.insert(0).first;
+ Table u(0, a1);
+ u = t1;
+ EXPECT_EQ(2, a1.num_allocs());
+ EXPECT_EQ(0, it->num_moves());
+ EXPECT_EQ(1, it->num_copies());
+}
+
+TEST_F(PropagateOnAll, CopyAssignmentWithDifferentAlloc) {
+ auto it = t1.insert(0).first;
+ Table u(0, a2);
+ u = t1;
+ EXPECT_EQ(a1, u.get_allocator());
+ EXPECT_EQ(2, a1.num_allocs());
+ EXPECT_EQ(0, a2.num_allocs());
+ EXPECT_EQ(0, it->num_moves());
+ EXPECT_EQ(1, it->num_copies());
+}
+
+TEST_F(NoPropagateOnCopy, CopyAssignmentWithDifferentAlloc) {
+ auto it = t1.insert(0).first;
+ Table u(0, a2);
+ u = t1;
+ EXPECT_EQ(a2, u.get_allocator());
+ EXPECT_EQ(1, a1.num_allocs());
+ EXPECT_EQ(1, a2.num_allocs());
+ EXPECT_EQ(0, it->num_moves());
+ EXPECT_EQ(1, it->num_copies());
+}
+
+TEST_F(PropagateOnAll, MoveAssignmentWithSameAlloc) {
+ auto it = t1.insert(0).first;
+ Table u(0, a1);
+ u = std::move(t1);
+ EXPECT_EQ(a1, u.get_allocator());
+ EXPECT_EQ(1, a1.num_allocs());
+ EXPECT_EQ(0, it->num_moves());
+ EXPECT_EQ(0, it->num_copies());
+}
+
+TEST_F(NoPropagateOnMove, MoveAssignmentWithSameAlloc) {
+ auto it = t1.insert(0).first;
+ Table u(0, a1);
+ u = std::move(t1);
+ EXPECT_EQ(a1, u.get_allocator());
+ EXPECT_EQ(1, a1.num_allocs());
+ EXPECT_EQ(0, it->num_moves());
+ EXPECT_EQ(0, it->num_copies());
+}
+
+TEST_F(PropagateOnAll, MoveAssignmentWithDifferentAlloc) {
+ auto it = t1.insert(0).first;
+ Table u(0, a2);
+ u = std::move(t1);
+ EXPECT_EQ(a1, u.get_allocator());
+ EXPECT_EQ(1, a1.num_allocs());
+ EXPECT_EQ(0, a2.num_allocs());
+ EXPECT_EQ(0, it->num_moves());
+ EXPECT_EQ(0, it->num_copies());
+}
+
+TEST_F(NoPropagateOnMove, MoveAssignmentWithDifferentAlloc) {
+ auto it = t1.insert(0).first;
+ Table u(0, a2);
+ u = std::move(t1);
+ it = u.find(0);
+ EXPECT_EQ(a2, u.get_allocator());
+ EXPECT_EQ(1, a1.num_allocs());
+ EXPECT_EQ(1, a2.num_allocs());
+ EXPECT_EQ(1, it->num_moves());
+ EXPECT_EQ(0, it->num_copies());
+}
+
+TEST_F(PropagateOnAll, Swap) {
+ auto it = t1.insert(0).first;
+ Table u(0, a2);
+ u.swap(t1);
+ EXPECT_EQ(a1, u.get_allocator());
+ EXPECT_EQ(a2, t1.get_allocator());
+ EXPECT_EQ(1, a1.num_allocs());
+ EXPECT_EQ(0, a2.num_allocs());
+ EXPECT_EQ(0, it->num_moves());
+ EXPECT_EQ(0, it->num_copies());
+}
+
+// This allocator is similar to std::pmr::polymorphic_allocator.
+// Note the disabled assignment.
+template <class T>
+class PAlloc {
+ template <class>
+ friend class PAlloc;
+
+ public:
+ // types
+ using value_type = T;
+
+ // traits
+ using propagate_on_container_swap = std::false_type;
+
+ PAlloc() noexcept = default;
+ explicit PAlloc(size_t id) noexcept : id_(id) {}
+ PAlloc(const PAlloc&) noexcept = default;
+ PAlloc& operator=(const PAlloc&) noexcept = delete;
+
+ template <class U>
+ PAlloc(const PAlloc<U>& that) noexcept : id_(that.id_) {} // NOLINT
+
+ template <class U>
+ struct rebind {
+ using other = PAlloc<U>;
+ };
+
+ constexpr PAlloc select_on_container_copy_construction() const { return {}; }
+
+ // public member functions
+ T* allocate(size_t) { return new T; }
+ void deallocate(T* p, size_t) { delete p; }
+
+ friend bool operator==(const PAlloc& a, const PAlloc& b) {
+ return a.id_ == b.id_;
+ }
+ friend bool operator!=(const PAlloc& a, const PAlloc& b) { return !(a == b); }
+
+ private:
+ size_t id_ = std::numeric_limits<size_t>::max();
+};
+
+// This doesn't compile with GCC 5.4 and 5.5 due to a bug in noexcept handing.
+#if !defined(__GNUC__) || __GNUC__ != 5 || (__GNUC_MINOR__ != 4 && \
+ __GNUC_MINOR__ != 5)
+TEST(NoPropagateOn, Swap) {
+ using PA = PAlloc<char>;
+ using Table = raw_hash_set<Policy, Identity, std::equal_to<int32_t>, PA>;
+
+ Table t1(PA{1}), t2(PA{2});
+ swap(t1, t2);
+ EXPECT_EQ(t1.get_allocator(), PA(1));
+ EXPECT_EQ(t2.get_allocator(), PA(2));
+}
+#endif
+
+TEST(NoPropagateOn, CopyConstruct) {
+ using PA = PAlloc<char>;
+ using Table = raw_hash_set<Policy, Identity, std::equal_to<int32_t>, PA>;
+
+ Table t1(PA{1}), t2(t1);
+ EXPECT_EQ(t1.get_allocator(), PA(1));
+ EXPECT_EQ(t2.get_allocator(), PA());
+}
+
+TEST(NoPropagateOn, Assignment) {
+ using PA = PAlloc<char>;
+ using Table = raw_hash_set<Policy, Identity, std::equal_to<int32_t>, PA>;
+
+ Table t1(PA{1}), t2(PA{2});
+ t1 = t2;
+ EXPECT_EQ(t1.get_allocator(), PA(1));
+ EXPECT_EQ(t2.get_allocator(), PA(2));
+}
+
+} // namespace
+} // namespace container_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/container/internal/raw_hash_set_test.cc b/third_party/abseil/src/absl/container/internal/raw_hash_set_test.cc
new file mode 100644
index 0000000..33d2773
--- /dev/null
+++ b/third_party/abseil/src/absl/container/internal/raw_hash_set_test.cc
@@ -0,0 +1,1893 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/container/internal/raw_hash_set.h"
+
+#include <cmath>
+#include <cstdint>
+#include <deque>
+#include <functional>
+#include <memory>
+#include <numeric>
+#include <random>
+#include <string>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/base/attributes.h"
+#include "absl/base/config.h"
+#include "absl/base/internal/cycleclock.h"
+#include "absl/base/internal/raw_logging.h"
+#include "absl/container/internal/container_memory.h"
+#include "absl/container/internal/hash_function_defaults.h"
+#include "absl/container/internal/hash_policy_testing.h"
+#include "absl/container/internal/hashtable_debug.h"
+#include "absl/strings/string_view.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace container_internal {
+
+struct RawHashSetTestOnlyAccess {
+ template <typename C>
+ static auto GetSlots(const C& c) -> decltype(c.slots_) {
+ return c.slots_;
+ }
+};
+
+namespace {
+
+using ::testing::DoubleNear;
+using ::testing::ElementsAre;
+using ::testing::Ge;
+using ::testing::Lt;
+using ::testing::Optional;
+using ::testing::Pair;
+using ::testing::UnorderedElementsAre;
+
+TEST(Util, NormalizeCapacity) {
+ EXPECT_EQ(1, NormalizeCapacity(0));
+ EXPECT_EQ(1, NormalizeCapacity(1));
+ EXPECT_EQ(3, NormalizeCapacity(2));
+ EXPECT_EQ(3, NormalizeCapacity(3));
+ EXPECT_EQ(7, NormalizeCapacity(4));
+ EXPECT_EQ(7, NormalizeCapacity(7));
+ EXPECT_EQ(15, NormalizeCapacity(8));
+ EXPECT_EQ(15, NormalizeCapacity(15));
+ EXPECT_EQ(15 * 2 + 1, NormalizeCapacity(15 + 1));
+ EXPECT_EQ(15 * 2 + 1, NormalizeCapacity(15 + 2));
+}
+
+TEST(Util, GrowthAndCapacity) {
+ // Verify that GrowthToCapacity gives the minimum capacity that has enough
+ // growth.
+ for (size_t growth = 0; growth < 10000; ++growth) {
+ SCOPED_TRACE(growth);
+ size_t capacity = NormalizeCapacity(GrowthToLowerboundCapacity(growth));
+ // The capacity is large enough for `growth`
+ EXPECT_THAT(CapacityToGrowth(capacity), Ge(growth));
+ if (growth != 0 && capacity > 1) {
+ // There is no smaller capacity that works.
+ EXPECT_THAT(CapacityToGrowth(capacity / 2), Lt(growth));
+ }
+ }
+
+ for (size_t capacity = Group::kWidth - 1; capacity < 10000;
+ capacity = 2 * capacity + 1) {
+ SCOPED_TRACE(capacity);
+ size_t growth = CapacityToGrowth(capacity);
+ EXPECT_THAT(growth, Lt(capacity));
+ EXPECT_LE(GrowthToLowerboundCapacity(growth), capacity);
+ EXPECT_EQ(NormalizeCapacity(GrowthToLowerboundCapacity(growth)), capacity);
+ }
+}
+
+TEST(Util, probe_seq) {
+ probe_seq<16> seq(0, 127);
+ auto gen = [&]() {
+ size_t res = seq.offset();
+ seq.next();
+ return res;
+ };
+ std::vector<size_t> offsets(8);
+ std::generate_n(offsets.begin(), 8, gen);
+ EXPECT_THAT(offsets, ElementsAre(0, 16, 48, 96, 32, 112, 80, 64));
+ seq = probe_seq<16>(128, 127);
+ std::generate_n(offsets.begin(), 8, gen);
+ EXPECT_THAT(offsets, ElementsAre(0, 16, 48, 96, 32, 112, 80, 64));
+}
+
+TEST(BitMask, Smoke) {
+ EXPECT_FALSE((BitMask<uint8_t, 8>(0)));
+ EXPECT_TRUE((BitMask<uint8_t, 8>(5)));
+
+ EXPECT_THAT((BitMask<uint8_t, 8>(0)), ElementsAre());
+ EXPECT_THAT((BitMask<uint8_t, 8>(0x1)), ElementsAre(0));
+ EXPECT_THAT((BitMask<uint8_t, 8>(0x2)), ElementsAre(1));
+ EXPECT_THAT((BitMask<uint8_t, 8>(0x3)), ElementsAre(0, 1));
+ EXPECT_THAT((BitMask<uint8_t, 8>(0x4)), ElementsAre(2));
+ EXPECT_THAT((BitMask<uint8_t, 8>(0x5)), ElementsAre(0, 2));
+ EXPECT_THAT((BitMask<uint8_t, 8>(0x55)), ElementsAre(0, 2, 4, 6));
+ EXPECT_THAT((BitMask<uint8_t, 8>(0xAA)), ElementsAre(1, 3, 5, 7));
+}
+
+TEST(BitMask, WithShift) {
+ // See the non-SSE version of Group for details on what this math is for.
+ uint64_t ctrl = 0x1716151413121110;
+ uint64_t hash = 0x12;
+ constexpr uint64_t msbs = 0x8080808080808080ULL;
+ constexpr uint64_t lsbs = 0x0101010101010101ULL;
+ auto x = ctrl ^ (lsbs * hash);
+ uint64_t mask = (x - lsbs) & ~x & msbs;
+ EXPECT_EQ(0x0000000080800000, mask);
+
+ BitMask<uint64_t, 8, 3> b(mask);
+ EXPECT_EQ(*b, 2);
+}
+
+TEST(BitMask, LeadingTrailing) {
+ EXPECT_EQ((BitMask<uint32_t, 16>(0x00001a40).LeadingZeros()), 3);
+ EXPECT_EQ((BitMask<uint32_t, 16>(0x00001a40).TrailingZeros()), 6);
+
+ EXPECT_EQ((BitMask<uint32_t, 16>(0x00000001).LeadingZeros()), 15);
+ EXPECT_EQ((BitMask<uint32_t, 16>(0x00000001).TrailingZeros()), 0);
+
+ EXPECT_EQ((BitMask<uint32_t, 16>(0x00008000).LeadingZeros()), 0);
+ EXPECT_EQ((BitMask<uint32_t, 16>(0x00008000).TrailingZeros()), 15);
+
+ EXPECT_EQ((BitMask<uint64_t, 8, 3>(0x0000008080808000).LeadingZeros()), 3);
+ EXPECT_EQ((BitMask<uint64_t, 8, 3>(0x0000008080808000).TrailingZeros()), 1);
+
+ EXPECT_EQ((BitMask<uint64_t, 8, 3>(0x0000000000000080).LeadingZeros()), 7);
+ EXPECT_EQ((BitMask<uint64_t, 8, 3>(0x0000000000000080).TrailingZeros()), 0);
+
+ EXPECT_EQ((BitMask<uint64_t, 8, 3>(0x8000000000000000).LeadingZeros()), 0);
+ EXPECT_EQ((BitMask<uint64_t, 8, 3>(0x8000000000000000).TrailingZeros()), 7);
+}
+
+TEST(Group, EmptyGroup) {
+ for (h2_t h = 0; h != 128; ++h) EXPECT_FALSE(Group{EmptyGroup()}.Match(h));
+}
+
+TEST(Group, Match) {
+ if (Group::kWidth == 16) {
+ ctrl_t group[] = {kEmpty, 1, kDeleted, 3, kEmpty, 5, kSentinel, 7,
+ 7, 5, 3, 1, 1, 1, 1, 1};
+ EXPECT_THAT(Group{group}.Match(0), ElementsAre());
+ EXPECT_THAT(Group{group}.Match(1), ElementsAre(1, 11, 12, 13, 14, 15));
+ EXPECT_THAT(Group{group}.Match(3), ElementsAre(3, 10));
+ EXPECT_THAT(Group{group}.Match(5), ElementsAre(5, 9));
+ EXPECT_THAT(Group{group}.Match(7), ElementsAre(7, 8));
+ } else if (Group::kWidth == 8) {
+ ctrl_t group[] = {kEmpty, 1, 2, kDeleted, 2, 1, kSentinel, 1};
+ EXPECT_THAT(Group{group}.Match(0), ElementsAre());
+ EXPECT_THAT(Group{group}.Match(1), ElementsAre(1, 5, 7));
+ EXPECT_THAT(Group{group}.Match(2), ElementsAre(2, 4));
+ } else {
+ FAIL() << "No test coverage for Group::kWidth==" << Group::kWidth;
+ }
+}
+
+TEST(Group, MatchEmpty) {
+ if (Group::kWidth == 16) {
+ ctrl_t group[] = {kEmpty, 1, kDeleted, 3, kEmpty, 5, kSentinel, 7,
+ 7, 5, 3, 1, 1, 1, 1, 1};
+ EXPECT_THAT(Group{group}.MatchEmpty(), ElementsAre(0, 4));
+ } else if (Group::kWidth == 8) {
+ ctrl_t group[] = {kEmpty, 1, 2, kDeleted, 2, 1, kSentinel, 1};
+ EXPECT_THAT(Group{group}.MatchEmpty(), ElementsAre(0));
+ } else {
+ FAIL() << "No test coverage for Group::kWidth==" << Group::kWidth;
+ }
+}
+
+TEST(Group, MatchEmptyOrDeleted) {
+ if (Group::kWidth == 16) {
+ ctrl_t group[] = {kEmpty, 1, kDeleted, 3, kEmpty, 5, kSentinel, 7,
+ 7, 5, 3, 1, 1, 1, 1, 1};
+ EXPECT_THAT(Group{group}.MatchEmptyOrDeleted(), ElementsAre(0, 2, 4));
+ } else if (Group::kWidth == 8) {
+ ctrl_t group[] = {kEmpty, 1, 2, kDeleted, 2, 1, kSentinel, 1};
+ EXPECT_THAT(Group{group}.MatchEmptyOrDeleted(), ElementsAre(0, 3));
+ } else {
+ FAIL() << "No test coverage for Group::kWidth==" << Group::kWidth;
+ }
+}
+
+TEST(Batch, DropDeletes) {
+ constexpr size_t kCapacity = 63;
+ constexpr size_t kGroupWidth = container_internal::Group::kWidth;
+ std::vector<ctrl_t> ctrl(kCapacity + 1 + kGroupWidth);
+ ctrl[kCapacity] = kSentinel;
+ std::vector<ctrl_t> pattern = {kEmpty, 2, kDeleted, 2, kEmpty, 1, kDeleted};
+ for (size_t i = 0; i != kCapacity; ++i) {
+ ctrl[i] = pattern[i % pattern.size()];
+ if (i < kGroupWidth - 1)
+ ctrl[i + kCapacity + 1] = pattern[i % pattern.size()];
+ }
+ ConvertDeletedToEmptyAndFullToDeleted(ctrl.data(), kCapacity);
+ ASSERT_EQ(ctrl[kCapacity], kSentinel);
+ for (size_t i = 0; i < kCapacity + 1 + kGroupWidth; ++i) {
+ ctrl_t expected = pattern[i % (kCapacity + 1) % pattern.size()];
+ if (i == kCapacity) expected = kSentinel;
+ if (expected == kDeleted) expected = kEmpty;
+ if (IsFull(expected)) expected = kDeleted;
+ EXPECT_EQ(ctrl[i], expected)
+ << i << " " << int{pattern[i % pattern.size()]};
+ }
+}
+
+TEST(Group, CountLeadingEmptyOrDeleted) {
+ const std::vector<ctrl_t> empty_examples = {kEmpty, kDeleted};
+ const std::vector<ctrl_t> full_examples = {0, 1, 2, 3, 5, 9, 127, kSentinel};
+
+ for (ctrl_t empty : empty_examples) {
+ std::vector<ctrl_t> e(Group::kWidth, empty);
+ EXPECT_EQ(Group::kWidth, Group{e.data()}.CountLeadingEmptyOrDeleted());
+ for (ctrl_t full : full_examples) {
+ for (size_t i = 0; i != Group::kWidth; ++i) {
+ std::vector<ctrl_t> f(Group::kWidth, empty);
+ f[i] = full;
+ EXPECT_EQ(i, Group{f.data()}.CountLeadingEmptyOrDeleted());
+ }
+ std::vector<ctrl_t> f(Group::kWidth, empty);
+ f[Group::kWidth * 2 / 3] = full;
+ f[Group::kWidth / 2] = full;
+ EXPECT_EQ(
+ Group::kWidth / 2, Group{f.data()}.CountLeadingEmptyOrDeleted());
+ }
+ }
+}
+
+struct IntPolicy {
+ using slot_type = int64_t;
+ using key_type = int64_t;
+ using init_type = int64_t;
+
+ static void construct(void*, int64_t* slot, int64_t v) { *slot = v; }
+ static void destroy(void*, int64_t*) {}
+ static void transfer(void*, int64_t* new_slot, int64_t* old_slot) {
+ *new_slot = *old_slot;
+ }
+
+ static int64_t& element(slot_type* slot) { return *slot; }
+
+ template <class F>
+ static auto apply(F&& f, int64_t x) -> decltype(std::forward<F>(f)(x, x)) {
+ return std::forward<F>(f)(x, x);
+ }
+};
+
+class StringPolicy {
+ template <class F, class K, class V,
+ class = typename std::enable_if<
+ std::is_convertible<const K&, absl::string_view>::value>::type>
+ decltype(std::declval<F>()(
+ std::declval<const absl::string_view&>(), std::piecewise_construct,
+ std::declval<std::tuple<K>>(),
+ std::declval<V>())) static apply_impl(F&& f,
+ std::pair<std::tuple<K>, V> p) {
+ const absl::string_view& key = std::get<0>(p.first);
+ return std::forward<F>(f)(key, std::piecewise_construct, std::move(p.first),
+ std::move(p.second));
+ }
+
+ public:
+ struct slot_type {
+ struct ctor {};
+
+ template <class... Ts>
+ slot_type(ctor, Ts&&... ts) : pair(std::forward<Ts>(ts)...) {}
+
+ std::pair<std::string, std::string> pair;
+ };
+
+ using key_type = std::string;
+ using init_type = std::pair<std::string, std::string>;
+
+ template <class allocator_type, class... Args>
+ static void construct(allocator_type* alloc, slot_type* slot, Args... args) {
+ std::allocator_traits<allocator_type>::construct(
+ *alloc, slot, typename slot_type::ctor(), std::forward<Args>(args)...);
+ }
+
+ template <class allocator_type>
+ static void destroy(allocator_type* alloc, slot_type* slot) {
+ std::allocator_traits<allocator_type>::destroy(*alloc, slot);
+ }
+
+ template <class allocator_type>
+ static void transfer(allocator_type* alloc, slot_type* new_slot,
+ slot_type* old_slot) {
+ construct(alloc, new_slot, std::move(old_slot->pair));
+ destroy(alloc, old_slot);
+ }
+
+ static std::pair<std::string, std::string>& element(slot_type* slot) {
+ return slot->pair;
+ }
+
+ template <class F, class... Args>
+ static auto apply(F&& f, Args&&... args)
+ -> decltype(apply_impl(std::forward<F>(f),
+ PairArgs(std::forward<Args>(args)...))) {
+ return apply_impl(std::forward<F>(f),
+ PairArgs(std::forward<Args>(args)...));
+ }
+};
+
+struct StringHash : absl::Hash<absl::string_view> {
+ using is_transparent = void;
+};
+struct StringEq : std::equal_to<absl::string_view> {
+ using is_transparent = void;
+};
+
+struct StringTable
+ : raw_hash_set<StringPolicy, StringHash, StringEq, std::allocator<int>> {
+ using Base = typename StringTable::raw_hash_set;
+ StringTable() {}
+ using Base::Base;
+};
+
+struct IntTable
+ : raw_hash_set<IntPolicy, container_internal::hash_default_hash<int64_t>,
+ std::equal_to<int64_t>, std::allocator<int64_t>> {
+ using Base = typename IntTable::raw_hash_set;
+ using Base::Base;
+};
+
+template <typename T>
+struct CustomAlloc : std::allocator<T> {
+ CustomAlloc() {}
+
+ template <typename U>
+ CustomAlloc(const CustomAlloc<U>& other) {}
+
+ template<class U> struct rebind {
+ using other = CustomAlloc<U>;
+ };
+};
+
+struct CustomAllocIntTable
+ : raw_hash_set<IntPolicy, container_internal::hash_default_hash<int64_t>,
+ std::equal_to<int64_t>, CustomAlloc<int64_t>> {
+ using Base = typename CustomAllocIntTable::raw_hash_set;
+ using Base::Base;
+};
+
+struct BadFastHash {
+ template <class T>
+ size_t operator()(const T&) const {
+ return 0;
+ }
+};
+
+struct BadTable : raw_hash_set<IntPolicy, BadFastHash, std::equal_to<int>,
+ std::allocator<int>> {
+ using Base = typename BadTable::raw_hash_set;
+ BadTable() {}
+ using Base::Base;
+};
+
+TEST(Table, EmptyFunctorOptimization) {
+ static_assert(std::is_empty<std::equal_to<absl::string_view>>::value, "");
+ static_assert(std::is_empty<std::allocator<int>>::value, "");
+
+ struct MockTable {
+ void* ctrl;
+ void* slots;
+ size_t size;
+ size_t capacity;
+ size_t growth_left;
+ void* infoz;
+ };
+ struct StatelessHash {
+ size_t operator()(absl::string_view) const { return 0; }
+ };
+ struct StatefulHash : StatelessHash {
+ size_t dummy;
+ };
+
+ EXPECT_EQ(
+ sizeof(MockTable),
+ sizeof(
+ raw_hash_set<StringPolicy, StatelessHash,
+ std::equal_to<absl::string_view>, std::allocator<int>>));
+
+ EXPECT_EQ(
+ sizeof(MockTable) + sizeof(StatefulHash),
+ sizeof(
+ raw_hash_set<StringPolicy, StatefulHash,
+ std::equal_to<absl::string_view>, std::allocator<int>>));
+}
+
+TEST(Table, Empty) {
+ IntTable t;
+ EXPECT_EQ(0, t.size());
+ EXPECT_TRUE(t.empty());
+}
+
+TEST(Table, LookupEmpty) {
+ IntTable t;
+ auto it = t.find(0);
+ EXPECT_TRUE(it == t.end());
+}
+
+TEST(Table, Insert1) {
+ IntTable t;
+ EXPECT_TRUE(t.find(0) == t.end());
+ auto res = t.emplace(0);
+ EXPECT_TRUE(res.second);
+ EXPECT_THAT(*res.first, 0);
+ EXPECT_EQ(1, t.size());
+ EXPECT_THAT(*t.find(0), 0);
+}
+
+TEST(Table, Insert2) {
+ IntTable t;
+ EXPECT_TRUE(t.find(0) == t.end());
+ auto res = t.emplace(0);
+ EXPECT_TRUE(res.second);
+ EXPECT_THAT(*res.first, 0);
+ EXPECT_EQ(1, t.size());
+ EXPECT_TRUE(t.find(1) == t.end());
+ res = t.emplace(1);
+ EXPECT_TRUE(res.second);
+ EXPECT_THAT(*res.first, 1);
+ EXPECT_EQ(2, t.size());
+ EXPECT_THAT(*t.find(0), 0);
+ EXPECT_THAT(*t.find(1), 1);
+}
+
+TEST(Table, InsertCollision) {
+ BadTable t;
+ EXPECT_TRUE(t.find(1) == t.end());
+ auto res = t.emplace(1);
+ EXPECT_TRUE(res.second);
+ EXPECT_THAT(*res.first, 1);
+ EXPECT_EQ(1, t.size());
+
+ EXPECT_TRUE(t.find(2) == t.end());
+ res = t.emplace(2);
+ EXPECT_THAT(*res.first, 2);
+ EXPECT_TRUE(res.second);
+ EXPECT_EQ(2, t.size());
+
+ EXPECT_THAT(*t.find(1), 1);
+ EXPECT_THAT(*t.find(2), 2);
+}
+
+// Test that we do not add existent element in case we need to search through
+// many groups with deleted elements
+TEST(Table, InsertCollisionAndFindAfterDelete) {
+ BadTable t; // all elements go to the same group.
+ // Have at least 2 groups with Group::kWidth collisions
+ // plus some extra collisions in the last group.
+ constexpr size_t kNumInserts = Group::kWidth * 2 + 5;
+ for (size_t i = 0; i < kNumInserts; ++i) {
+ auto res = t.emplace(i);
+ EXPECT_TRUE(res.second);
+ EXPECT_THAT(*res.first, i);
+ EXPECT_EQ(i + 1, t.size());
+ }
+
+ // Remove elements one by one and check
+ // that we still can find all other elements.
+ for (size_t i = 0; i < kNumInserts; ++i) {
+ EXPECT_EQ(1, t.erase(i)) << i;
+ for (size_t j = i + 1; j < kNumInserts; ++j) {
+ EXPECT_THAT(*t.find(j), j);
+ auto res = t.emplace(j);
+ EXPECT_FALSE(res.second) << i << " " << j;
+ EXPECT_THAT(*res.first, j);
+ EXPECT_EQ(kNumInserts - i - 1, t.size());
+ }
+ }
+ EXPECT_TRUE(t.empty());
+}
+
+TEST(Table, LazyEmplace) {
+ StringTable t;
+ bool called = false;
+ auto it = t.lazy_emplace("abc", [&](const StringTable::constructor& f) {
+ called = true;
+ f("abc", "ABC");
+ });
+ EXPECT_TRUE(called);
+ EXPECT_THAT(*it, Pair("abc", "ABC"));
+ called = false;
+ it = t.lazy_emplace("abc", [&](const StringTable::constructor& f) {
+ called = true;
+ f("abc", "DEF");
+ });
+ EXPECT_FALSE(called);
+ EXPECT_THAT(*it, Pair("abc", "ABC"));
+}
+
+TEST(Table, ContainsEmpty) {
+ IntTable t;
+
+ EXPECT_FALSE(t.contains(0));
+}
+
+TEST(Table, Contains1) {
+ IntTable t;
+
+ EXPECT_TRUE(t.insert(0).second);
+ EXPECT_TRUE(t.contains(0));
+ EXPECT_FALSE(t.contains(1));
+
+ EXPECT_EQ(1, t.erase(0));
+ EXPECT_FALSE(t.contains(0));
+}
+
+TEST(Table, Contains2) {
+ IntTable t;
+
+ EXPECT_TRUE(t.insert(0).second);
+ EXPECT_TRUE(t.contains(0));
+ EXPECT_FALSE(t.contains(1));
+
+ t.clear();
+ EXPECT_FALSE(t.contains(0));
+}
+
+int decompose_constructed;
+struct DecomposeType {
+ DecomposeType(int i) : i(i) { // NOLINT
+ ++decompose_constructed;
+ }
+
+ explicit DecomposeType(const char* d) : DecomposeType(*d) {}
+
+ int i;
+};
+
+struct DecomposeHash {
+ using is_transparent = void;
+ size_t operator()(DecomposeType a) const { return a.i; }
+ size_t operator()(int a) const { return a; }
+ size_t operator()(const char* a) const { return *a; }
+};
+
+struct DecomposeEq {
+ using is_transparent = void;
+ bool operator()(DecomposeType a, DecomposeType b) const { return a.i == b.i; }
+ bool operator()(DecomposeType a, int b) const { return a.i == b; }
+ bool operator()(DecomposeType a, const char* b) const { return a.i == *b; }
+};
+
+struct DecomposePolicy {
+ using slot_type = DecomposeType;
+ using key_type = DecomposeType;
+ using init_type = DecomposeType;
+
+ template <typename T>
+ static void construct(void*, DecomposeType* slot, T&& v) {
+ *slot = DecomposeType(std::forward<T>(v));
+ }
+ static void destroy(void*, DecomposeType*) {}
+ static DecomposeType& element(slot_type* slot) { return *slot; }
+
+ template <class F, class T>
+ static auto apply(F&& f, const T& x) -> decltype(std::forward<F>(f)(x, x)) {
+ return std::forward<F>(f)(x, x);
+ }
+};
+
+template <typename Hash, typename Eq>
+void TestDecompose(bool construct_three) {
+ DecomposeType elem{0};
+ const int one = 1;
+ const char* three_p = "3";
+ const auto& three = three_p;
+
+ raw_hash_set<DecomposePolicy, Hash, Eq, std::allocator<int>> set1;
+
+ decompose_constructed = 0;
+ int expected_constructed = 0;
+ EXPECT_EQ(expected_constructed, decompose_constructed);
+ set1.insert(elem);
+ EXPECT_EQ(expected_constructed, decompose_constructed);
+ set1.insert(1);
+ EXPECT_EQ(++expected_constructed, decompose_constructed);
+ set1.emplace("3");
+ EXPECT_EQ(++expected_constructed, decompose_constructed);
+ EXPECT_EQ(expected_constructed, decompose_constructed);
+
+ { // insert(T&&)
+ set1.insert(1);
+ EXPECT_EQ(expected_constructed, decompose_constructed);
+ }
+
+ { // insert(const T&)
+ set1.insert(one);
+ EXPECT_EQ(expected_constructed, decompose_constructed);
+ }
+
+ { // insert(hint, T&&)
+ set1.insert(set1.begin(), 1);
+ EXPECT_EQ(expected_constructed, decompose_constructed);
+ }
+
+ { // insert(hint, const T&)
+ set1.insert(set1.begin(), one);
+ EXPECT_EQ(expected_constructed, decompose_constructed);
+ }
+
+ { // emplace(...)
+ set1.emplace(1);
+ EXPECT_EQ(expected_constructed, decompose_constructed);
+ set1.emplace("3");
+ expected_constructed += construct_three;
+ EXPECT_EQ(expected_constructed, decompose_constructed);
+ set1.emplace(one);
+ EXPECT_EQ(expected_constructed, decompose_constructed);
+ set1.emplace(three);
+ expected_constructed += construct_three;
+ EXPECT_EQ(expected_constructed, decompose_constructed);
+ }
+
+ { // emplace_hint(...)
+ set1.emplace_hint(set1.begin(), 1);
+ EXPECT_EQ(expected_constructed, decompose_constructed);
+ set1.emplace_hint(set1.begin(), "3");
+ expected_constructed += construct_three;
+ EXPECT_EQ(expected_constructed, decompose_constructed);
+ set1.emplace_hint(set1.begin(), one);
+ EXPECT_EQ(expected_constructed, decompose_constructed);
+ set1.emplace_hint(set1.begin(), three);
+ expected_constructed += construct_three;
+ EXPECT_EQ(expected_constructed, decompose_constructed);
+ }
+}
+
+TEST(Table, Decompose) {
+ TestDecompose<DecomposeHash, DecomposeEq>(false);
+
+ struct TransparentHashIntOverload {
+ size_t operator()(DecomposeType a) const { return a.i; }
+ size_t operator()(int a) const { return a; }
+ };
+ struct TransparentEqIntOverload {
+ bool operator()(DecomposeType a, DecomposeType b) const {
+ return a.i == b.i;
+ }
+ bool operator()(DecomposeType a, int b) const { return a.i == b; }
+ };
+ TestDecompose<TransparentHashIntOverload, DecomposeEq>(true);
+ TestDecompose<TransparentHashIntOverload, TransparentEqIntOverload>(true);
+ TestDecompose<DecomposeHash, TransparentEqIntOverload>(true);
+}
+
+// Returns the largest m such that a table with m elements has the same number
+// of buckets as a table with n elements.
+size_t MaxDensitySize(size_t n) {
+ IntTable t;
+ t.reserve(n);
+ for (size_t i = 0; i != n; ++i) t.emplace(i);
+ const size_t c = t.bucket_count();
+ while (c == t.bucket_count()) t.emplace(n++);
+ return t.size() - 1;
+}
+
+struct Modulo1000Hash {
+ size_t operator()(int x) const { return x % 1000; }
+};
+
+struct Modulo1000HashTable
+ : public raw_hash_set<IntPolicy, Modulo1000Hash, std::equal_to<int>,
+ std::allocator<int>> {};
+
+// Test that rehash with no resize happen in case of many deleted slots.
+TEST(Table, RehashWithNoResize) {
+ Modulo1000HashTable t;
+ // Adding the same length (and the same hash) strings
+ // to have at least kMinFullGroups groups
+ // with Group::kWidth collisions. Then fill up to MaxDensitySize;
+ const size_t kMinFullGroups = 7;
+ std::vector<int> keys;
+ for (size_t i = 0; i < MaxDensitySize(Group::kWidth * kMinFullGroups); ++i) {
+ int k = i * 1000;
+ t.emplace(k);
+ keys.push_back(k);
+ }
+ const size_t capacity = t.capacity();
+
+ // Remove elements from all groups except the first and the last one.
+ // All elements removed from full groups will be marked as kDeleted.
+ const size_t erase_begin = Group::kWidth / 2;
+ const size_t erase_end = (t.size() / Group::kWidth - 1) * Group::kWidth;
+ for (size_t i = erase_begin; i < erase_end; ++i) {
+ EXPECT_EQ(1, t.erase(keys[i])) << i;
+ }
+ keys.erase(keys.begin() + erase_begin, keys.begin() + erase_end);
+
+ auto last_key = keys.back();
+ size_t last_key_num_probes = GetHashtableDebugNumProbes(t, last_key);
+
+ // Make sure that we have to make a lot of probes for last key.
+ ASSERT_GT(last_key_num_probes, kMinFullGroups);
+
+ int x = 1;
+ // Insert and erase one element, before inplace rehash happen.
+ while (last_key_num_probes == GetHashtableDebugNumProbes(t, last_key)) {
+ t.emplace(x);
+ ASSERT_EQ(capacity, t.capacity());
+ // All elements should be there.
+ ASSERT_TRUE(t.find(x) != t.end()) << x;
+ for (const auto& k : keys) {
+ ASSERT_TRUE(t.find(k) != t.end()) << k;
+ }
+ t.erase(x);
+ ++x;
+ }
+}
+
+TEST(Table, InsertEraseStressTest) {
+ IntTable t;
+ const size_t kMinElementCount = 250;
+ std::deque<int> keys;
+ size_t i = 0;
+ for (; i < MaxDensitySize(kMinElementCount); ++i) {
+ t.emplace(i);
+ keys.push_back(i);
+ }
+ const size_t kNumIterations = 1000000;
+ for (; i < kNumIterations; ++i) {
+ ASSERT_EQ(1, t.erase(keys.front()));
+ keys.pop_front();
+ t.emplace(i);
+ keys.push_back(i);
+ }
+}
+
+TEST(Table, InsertOverloads) {
+ StringTable t;
+ // These should all trigger the insert(init_type) overload.
+ t.insert({{}, {}});
+ t.insert({"ABC", {}});
+ t.insert({"DEF", "!!!"});
+
+ EXPECT_THAT(t, UnorderedElementsAre(Pair("", ""), Pair("ABC", ""),
+ Pair("DEF", "!!!")));
+}
+
+TEST(Table, LargeTable) {
+ IntTable t;
+ for (int64_t i = 0; i != 100000; ++i) t.emplace(i << 40);
+ for (int64_t i = 0; i != 100000; ++i) ASSERT_EQ(i << 40, *t.find(i << 40));
+}
+
+// Timeout if copy is quadratic as it was in Rust.
+TEST(Table, EnsureNonQuadraticAsInRust) {
+ static const size_t kLargeSize = 1 << 15;
+
+ IntTable t;
+ for (size_t i = 0; i != kLargeSize; ++i) {
+ t.insert(i);
+ }
+
+ // If this is quadratic, the test will timeout.
+ IntTable t2;
+ for (const auto& entry : t) t2.insert(entry);
+}
+
+TEST(Table, ClearBug) {
+ IntTable t;
+ constexpr size_t capacity = container_internal::Group::kWidth - 1;
+ constexpr size_t max_size = capacity / 2 + 1;
+ for (size_t i = 0; i < max_size; ++i) {
+ t.insert(i);
+ }
+ ASSERT_EQ(capacity, t.capacity());
+ intptr_t original = reinterpret_cast<intptr_t>(&*t.find(2));
+ t.clear();
+ ASSERT_EQ(capacity, t.capacity());
+ for (size_t i = 0; i < max_size; ++i) {
+ t.insert(i);
+ }
+ ASSERT_EQ(capacity, t.capacity());
+ intptr_t second = reinterpret_cast<intptr_t>(&*t.find(2));
+ // We are checking that original and second are close enough to each other
+ // that they are probably still in the same group. This is not strictly
+ // guaranteed.
+ EXPECT_LT(std::abs(original - second),
+ capacity * sizeof(IntTable::value_type));
+}
+
+TEST(Table, Erase) {
+ IntTable t;
+ EXPECT_TRUE(t.find(0) == t.end());
+ auto res = t.emplace(0);
+ EXPECT_TRUE(res.second);
+ EXPECT_EQ(1, t.size());
+ t.erase(res.first);
+ EXPECT_EQ(0, t.size());
+ EXPECT_TRUE(t.find(0) == t.end());
+}
+
+TEST(Table, EraseMaintainsValidIterator) {
+ IntTable t;
+ const int kNumElements = 100;
+ for (int i = 0; i < kNumElements; i ++) {
+ EXPECT_TRUE(t.emplace(i).second);
+ }
+ EXPECT_EQ(t.size(), kNumElements);
+
+ int num_erase_calls = 0;
+ auto it = t.begin();
+ while (it != t.end()) {
+ t.erase(it++);
+ num_erase_calls++;
+ }
+
+ EXPECT_TRUE(t.empty());
+ EXPECT_EQ(num_erase_calls, kNumElements);
+}
+
+// Collect N bad keys by following algorithm:
+// 1. Create an empty table and reserve it to 2 * N.
+// 2. Insert N random elements.
+// 3. Take first Group::kWidth - 1 to bad_keys array.
+// 4. Clear the table without resize.
+// 5. Go to point 2 while N keys not collected
+std::vector<int64_t> CollectBadMergeKeys(size_t N) {
+ static constexpr int kGroupSize = Group::kWidth - 1;
+
+ auto topk_range = [](size_t b, size_t e,
+ IntTable* t) -> std::vector<int64_t> {
+ for (size_t i = b; i != e; ++i) {
+ t->emplace(i);
+ }
+ std::vector<int64_t> res;
+ res.reserve(kGroupSize);
+ auto it = t->begin();
+ for (size_t i = b; i != e && i != b + kGroupSize; ++i, ++it) {
+ res.push_back(*it);
+ }
+ return res;
+ };
+
+ std::vector<int64_t> bad_keys;
+ bad_keys.reserve(N);
+ IntTable t;
+ t.reserve(N * 2);
+
+ for (size_t b = 0; bad_keys.size() < N; b += N) {
+ auto keys = topk_range(b, b + N, &t);
+ bad_keys.insert(bad_keys.end(), keys.begin(), keys.end());
+ t.erase(t.begin(), t.end());
+ EXPECT_TRUE(t.empty());
+ }
+ return bad_keys;
+}
+
+struct ProbeStats {
+ // Number of elements with specific probe length over all tested tables.
+ std::vector<size_t> all_probes_histogram;
+ // Ratios total_probe_length/size for every tested table.
+ std::vector<double> single_table_ratios;
+
+ friend ProbeStats operator+(const ProbeStats& a, const ProbeStats& b) {
+ ProbeStats res = a;
+ res.all_probes_histogram.resize(std::max(res.all_probes_histogram.size(),
+ b.all_probes_histogram.size()));
+ std::transform(b.all_probes_histogram.begin(), b.all_probes_histogram.end(),
+ res.all_probes_histogram.begin(),
+ res.all_probes_histogram.begin(), std::plus<size_t>());
+ res.single_table_ratios.insert(res.single_table_ratios.end(),
+ b.single_table_ratios.begin(),
+ b.single_table_ratios.end());
+ return res;
+ }
+
+ // Average ratio total_probe_length/size over tables.
+ double AvgRatio() const {
+ return std::accumulate(single_table_ratios.begin(),
+ single_table_ratios.end(), 0.0) /
+ single_table_ratios.size();
+ }
+
+ // Maximum ratio total_probe_length/size over tables.
+ double MaxRatio() const {
+ return *std::max_element(single_table_ratios.begin(),
+ single_table_ratios.end());
+ }
+
+ // Percentile ratio total_probe_length/size over tables.
+ double PercentileRatio(double Percentile = 0.95) const {
+ auto r = single_table_ratios;
+ auto mid = r.begin() + static_cast<size_t>(r.size() * Percentile);
+ if (mid != r.end()) {
+ std::nth_element(r.begin(), mid, r.end());
+ return *mid;
+ } else {
+ return MaxRatio();
+ }
+ }
+
+ // Maximum probe length over all elements and all tables.
+ size_t MaxProbe() const { return all_probes_histogram.size(); }
+
+ // Fraction of elements with specified probe length.
+ std::vector<double> ProbeNormalizedHistogram() const {
+ double total_elements = std::accumulate(all_probes_histogram.begin(),
+ all_probes_histogram.end(), 0ull);
+ std::vector<double> res;
+ for (size_t p : all_probes_histogram) {
+ res.push_back(p / total_elements);
+ }
+ return res;
+ }
+
+ size_t PercentileProbe(double Percentile = 0.99) const {
+ size_t idx = 0;
+ for (double p : ProbeNormalizedHistogram()) {
+ if (Percentile > p) {
+ Percentile -= p;
+ ++idx;
+ } else {
+ return idx;
+ }
+ }
+ return idx;
+ }
+
+ friend std::ostream& operator<<(std::ostream& out, const ProbeStats& s) {
+ out << "{AvgRatio:" << s.AvgRatio() << ", MaxRatio:" << s.MaxRatio()
+ << ", PercentileRatio:" << s.PercentileRatio()
+ << ", MaxProbe:" << s.MaxProbe() << ", Probes=[";
+ for (double p : s.ProbeNormalizedHistogram()) {
+ out << p << ",";
+ }
+ out << "]}";
+
+ return out;
+ }
+};
+
+struct ExpectedStats {
+ double avg_ratio;
+ double max_ratio;
+ std::vector<std::pair<double, double>> pecentile_ratios;
+ std::vector<std::pair<double, double>> pecentile_probes;
+
+ friend std::ostream& operator<<(std::ostream& out, const ExpectedStats& s) {
+ out << "{AvgRatio:" << s.avg_ratio << ", MaxRatio:" << s.max_ratio
+ << ", PercentileRatios: [";
+ for (auto el : s.pecentile_ratios) {
+ out << el.first << ":" << el.second << ", ";
+ }
+ out << "], PercentileProbes: [";
+ for (auto el : s.pecentile_probes) {
+ out << el.first << ":" << el.second << ", ";
+ }
+ out << "]}";
+
+ return out;
+ }
+};
+
+void VerifyStats(size_t size, const ExpectedStats& exp,
+ const ProbeStats& stats) {
+ EXPECT_LT(stats.AvgRatio(), exp.avg_ratio) << size << " " << stats;
+ EXPECT_LT(stats.MaxRatio(), exp.max_ratio) << size << " " << stats;
+ for (auto pr : exp.pecentile_ratios) {
+ EXPECT_LE(stats.PercentileRatio(pr.first), pr.second)
+ << size << " " << pr.first << " " << stats;
+ }
+
+ for (auto pr : exp.pecentile_probes) {
+ EXPECT_LE(stats.PercentileProbe(pr.first), pr.second)
+ << size << " " << pr.first << " " << stats;
+ }
+}
+
+using ProbeStatsPerSize = std::map<size_t, ProbeStats>;
+
+// Collect total ProbeStats on num_iters iterations of the following algorithm:
+// 1. Create new table and reserve it to keys.size() * 2
+// 2. Insert all keys xored with seed
+// 3. Collect ProbeStats from final table.
+ProbeStats CollectProbeStatsOnKeysXoredWithSeed(
+ const std::vector<int64_t>& keys, size_t num_iters) {
+ const size_t reserve_size = keys.size() * 2;
+
+ ProbeStats stats;
+
+ int64_t seed = 0x71b1a19b907d6e33;
+ while (num_iters--) {
+ seed = static_cast<int64_t>(static_cast<uint64_t>(seed) * 17 + 13);
+ IntTable t1;
+ t1.reserve(reserve_size);
+ for (const auto& key : keys) {
+ t1.emplace(key ^ seed);
+ }
+
+ auto probe_histogram = GetHashtableDebugNumProbesHistogram(t1);
+ stats.all_probes_histogram.resize(
+ std::max(stats.all_probes_histogram.size(), probe_histogram.size()));
+ std::transform(probe_histogram.begin(), probe_histogram.end(),
+ stats.all_probes_histogram.begin(),
+ stats.all_probes_histogram.begin(), std::plus<size_t>());
+
+ size_t total_probe_seq_length = 0;
+ for (size_t i = 0; i < probe_histogram.size(); ++i) {
+ total_probe_seq_length += i * probe_histogram[i];
+ }
+ stats.single_table_ratios.push_back(total_probe_seq_length * 1.0 /
+ keys.size());
+ t1.erase(t1.begin(), t1.end());
+ }
+ return stats;
+}
+
+ExpectedStats XorSeedExpectedStats() {
+ constexpr bool kRandomizesInserts =
+#ifdef NDEBUG
+ false;
+#else // NDEBUG
+ true;
+#endif // NDEBUG
+
+ // The effective load factor is larger in non-opt mode because we insert
+ // elements out of order.
+ switch (container_internal::Group::kWidth) {
+ case 8:
+ if (kRandomizesInserts) {
+ return {0.05,
+ 1.0,
+ {{0.95, 0.5}},
+ {{0.95, 0}, {0.99, 2}, {0.999, 4}, {0.9999, 10}}};
+ } else {
+ return {0.05,
+ 2.0,
+ {{0.95, 0.1}},
+ {{0.95, 0}, {0.99, 2}, {0.999, 4}, {0.9999, 10}}};
+ }
+ case 16:
+ if (kRandomizesInserts) {
+ return {0.1,
+ 1.0,
+ {{0.95, 0.1}},
+ {{0.95, 0}, {0.99, 1}, {0.999, 8}, {0.9999, 15}}};
+ } else {
+ return {0.05,
+ 1.0,
+ {{0.95, 0.05}},
+ {{0.95, 0}, {0.99, 1}, {0.999, 4}, {0.9999, 10}}};
+ }
+ }
+ ABSL_RAW_LOG(FATAL, "%s", "Unknown Group width");
+ return {};
+}
+
+TEST(Table, DISABLED_EnsureNonQuadraticTopNXorSeedByProbeSeqLength) {
+ ProbeStatsPerSize stats;
+ std::vector<size_t> sizes = {Group::kWidth << 5, Group::kWidth << 10};
+ for (size_t size : sizes) {
+ stats[size] =
+ CollectProbeStatsOnKeysXoredWithSeed(CollectBadMergeKeys(size), 200);
+ }
+ auto expected = XorSeedExpectedStats();
+ for (size_t size : sizes) {
+ auto& stat = stats[size];
+ VerifyStats(size, expected, stat);
+ }
+}
+
+// Collect total ProbeStats on num_iters iterations of the following algorithm:
+// 1. Create new table
+// 2. Select 10% of keys and insert 10 elements key * 17 + j * 13
+// 3. Collect ProbeStats from final table
+ProbeStats CollectProbeStatsOnLinearlyTransformedKeys(
+ const std::vector<int64_t>& keys, size_t num_iters) {
+ ProbeStats stats;
+
+ std::random_device rd;
+ std::mt19937 rng(rd());
+ auto linear_transform = [](size_t x, size_t y) { return x * 17 + y * 13; };
+ std::uniform_int_distribution<size_t> dist(0, keys.size()-1);
+ while (num_iters--) {
+ IntTable t1;
+ size_t num_keys = keys.size() / 10;
+ size_t start = dist(rng);
+ for (size_t i = 0; i != num_keys; ++i) {
+ for (size_t j = 0; j != 10; ++j) {
+ t1.emplace(linear_transform(keys[(i + start) % keys.size()], j));
+ }
+ }
+
+ auto probe_histogram = GetHashtableDebugNumProbesHistogram(t1);
+ stats.all_probes_histogram.resize(
+ std::max(stats.all_probes_histogram.size(), probe_histogram.size()));
+ std::transform(probe_histogram.begin(), probe_histogram.end(),
+ stats.all_probes_histogram.begin(),
+ stats.all_probes_histogram.begin(), std::plus<size_t>());
+
+ size_t total_probe_seq_length = 0;
+ for (size_t i = 0; i < probe_histogram.size(); ++i) {
+ total_probe_seq_length += i * probe_histogram[i];
+ }
+ stats.single_table_ratios.push_back(total_probe_seq_length * 1.0 /
+ t1.size());
+ t1.erase(t1.begin(), t1.end());
+ }
+ return stats;
+}
+
+ExpectedStats LinearTransformExpectedStats() {
+ constexpr bool kRandomizesInserts =
+#ifdef NDEBUG
+ false;
+#else // NDEBUG
+ true;
+#endif // NDEBUG
+
+ // The effective load factor is larger in non-opt mode because we insert
+ // elements out of order.
+ switch (container_internal::Group::kWidth) {
+ case 8:
+ if (kRandomizesInserts) {
+ return {0.1,
+ 0.5,
+ {{0.95, 0.3}},
+ {{0.95, 0}, {0.99, 1}, {0.999, 8}, {0.9999, 15}}};
+ } else {
+ return {0.15,
+ 0.5,
+ {{0.95, 0.3}},
+ {{0.95, 0}, {0.99, 3}, {0.999, 15}, {0.9999, 25}}};
+ }
+ case 16:
+ if (kRandomizesInserts) {
+ return {0.1,
+ 0.4,
+ {{0.95, 0.3}},
+ {{0.95, 0}, {0.99, 1}, {0.999, 8}, {0.9999, 15}}};
+ } else {
+ return {0.05,
+ 0.2,
+ {{0.95, 0.1}},
+ {{0.95, 0}, {0.99, 1}, {0.999, 6}, {0.9999, 10}}};
+ }
+ }
+ ABSL_RAW_LOG(FATAL, "%s", "Unknown Group width");
+ return {};
+}
+
+TEST(Table, DISABLED_EnsureNonQuadraticTopNLinearTransformByProbeSeqLength) {
+ ProbeStatsPerSize stats;
+ std::vector<size_t> sizes = {Group::kWidth << 5, Group::kWidth << 10};
+ for (size_t size : sizes) {
+ stats[size] = CollectProbeStatsOnLinearlyTransformedKeys(
+ CollectBadMergeKeys(size), 300);
+ }
+ auto expected = LinearTransformExpectedStats();
+ for (size_t size : sizes) {
+ auto& stat = stats[size];
+ VerifyStats(size, expected, stat);
+ }
+}
+
+TEST(Table, EraseCollision) {
+ BadTable t;
+
+ // 1 2 3
+ t.emplace(1);
+ t.emplace(2);
+ t.emplace(3);
+ EXPECT_THAT(*t.find(1), 1);
+ EXPECT_THAT(*t.find(2), 2);
+ EXPECT_THAT(*t.find(3), 3);
+ EXPECT_EQ(3, t.size());
+
+ // 1 DELETED 3
+ t.erase(t.find(2));
+ EXPECT_THAT(*t.find(1), 1);
+ EXPECT_TRUE(t.find(2) == t.end());
+ EXPECT_THAT(*t.find(3), 3);
+ EXPECT_EQ(2, t.size());
+
+ // DELETED DELETED 3
+ t.erase(t.find(1));
+ EXPECT_TRUE(t.find(1) == t.end());
+ EXPECT_TRUE(t.find(2) == t.end());
+ EXPECT_THAT(*t.find(3), 3);
+ EXPECT_EQ(1, t.size());
+
+ // DELETED DELETED DELETED
+ t.erase(t.find(3));
+ EXPECT_TRUE(t.find(1) == t.end());
+ EXPECT_TRUE(t.find(2) == t.end());
+ EXPECT_TRUE(t.find(3) == t.end());
+ EXPECT_EQ(0, t.size());
+}
+
+TEST(Table, EraseInsertProbing) {
+ BadTable t(100);
+
+ // 1 2 3 4
+ t.emplace(1);
+ t.emplace(2);
+ t.emplace(3);
+ t.emplace(4);
+
+ // 1 DELETED 3 DELETED
+ t.erase(t.find(2));
+ t.erase(t.find(4));
+
+ // 1 10 3 11 12
+ t.emplace(10);
+ t.emplace(11);
+ t.emplace(12);
+
+ EXPECT_EQ(5, t.size());
+ EXPECT_THAT(t, UnorderedElementsAre(1, 10, 3, 11, 12));
+}
+
+TEST(Table, Clear) {
+ IntTable t;
+ EXPECT_TRUE(t.find(0) == t.end());
+ t.clear();
+ EXPECT_TRUE(t.find(0) == t.end());
+ auto res = t.emplace(0);
+ EXPECT_TRUE(res.second);
+ EXPECT_EQ(1, t.size());
+ t.clear();
+ EXPECT_EQ(0, t.size());
+ EXPECT_TRUE(t.find(0) == t.end());
+}
+
+TEST(Table, Swap) {
+ IntTable t;
+ EXPECT_TRUE(t.find(0) == t.end());
+ auto res = t.emplace(0);
+ EXPECT_TRUE(res.second);
+ EXPECT_EQ(1, t.size());
+ IntTable u;
+ t.swap(u);
+ EXPECT_EQ(0, t.size());
+ EXPECT_EQ(1, u.size());
+ EXPECT_TRUE(t.find(0) == t.end());
+ EXPECT_THAT(*u.find(0), 0);
+}
+
+TEST(Table, Rehash) {
+ IntTable t;
+ EXPECT_TRUE(t.find(0) == t.end());
+ t.emplace(0);
+ t.emplace(1);
+ EXPECT_EQ(2, t.size());
+ t.rehash(128);
+ EXPECT_EQ(2, t.size());
+ EXPECT_THAT(*t.find(0), 0);
+ EXPECT_THAT(*t.find(1), 1);
+}
+
+TEST(Table, RehashDoesNotRehashWhenNotNecessary) {
+ IntTable t;
+ t.emplace(0);
+ t.emplace(1);
+ auto* p = &*t.find(0);
+ t.rehash(1);
+ EXPECT_EQ(p, &*t.find(0));
+}
+
+TEST(Table, RehashZeroDoesNotAllocateOnEmptyTable) {
+ IntTable t;
+ t.rehash(0);
+ EXPECT_EQ(0, t.bucket_count());
+}
+
+TEST(Table, RehashZeroDeallocatesEmptyTable) {
+ IntTable t;
+ t.emplace(0);
+ t.clear();
+ EXPECT_NE(0, t.bucket_count());
+ t.rehash(0);
+ EXPECT_EQ(0, t.bucket_count());
+}
+
+TEST(Table, RehashZeroForcesRehash) {
+ IntTable t;
+ t.emplace(0);
+ t.emplace(1);
+ auto* p = &*t.find(0);
+ t.rehash(0);
+ EXPECT_NE(p, &*t.find(0));
+}
+
+TEST(Table, ConstructFromInitList) {
+ using P = std::pair<std::string, std::string>;
+ struct Q {
+ operator P() const { return {}; }
+ };
+ StringTable t = {P(), Q(), {}, {{}, {}}};
+}
+
+TEST(Table, CopyConstruct) {
+ IntTable t;
+ t.emplace(0);
+ EXPECT_EQ(1, t.size());
+ {
+ IntTable u(t);
+ EXPECT_EQ(1, u.size());
+ EXPECT_THAT(*u.find(0), 0);
+ }
+ {
+ IntTable u{t};
+ EXPECT_EQ(1, u.size());
+ EXPECT_THAT(*u.find(0), 0);
+ }
+ {
+ IntTable u = t;
+ EXPECT_EQ(1, u.size());
+ EXPECT_THAT(*u.find(0), 0);
+ }
+}
+
+TEST(Table, CopyConstructWithAlloc) {
+ StringTable t;
+ t.emplace("a", "b");
+ EXPECT_EQ(1, t.size());
+ StringTable u(t, Alloc<std::pair<std::string, std::string>>());
+ EXPECT_EQ(1, u.size());
+ EXPECT_THAT(*u.find("a"), Pair("a", "b"));
+}
+
+struct ExplicitAllocIntTable
+ : raw_hash_set<IntPolicy, container_internal::hash_default_hash<int64_t>,
+ std::equal_to<int64_t>, Alloc<int64_t>> {
+ ExplicitAllocIntTable() {}
+};
+
+TEST(Table, AllocWithExplicitCtor) {
+ ExplicitAllocIntTable t;
+ EXPECT_EQ(0, t.size());
+}
+
+TEST(Table, MoveConstruct) {
+ {
+ StringTable t;
+ t.emplace("a", "b");
+ EXPECT_EQ(1, t.size());
+
+ StringTable u(std::move(t));
+ EXPECT_EQ(1, u.size());
+ EXPECT_THAT(*u.find("a"), Pair("a", "b"));
+ }
+ {
+ StringTable t;
+ t.emplace("a", "b");
+ EXPECT_EQ(1, t.size());
+
+ StringTable u{std::move(t)};
+ EXPECT_EQ(1, u.size());
+ EXPECT_THAT(*u.find("a"), Pair("a", "b"));
+ }
+ {
+ StringTable t;
+ t.emplace("a", "b");
+ EXPECT_EQ(1, t.size());
+
+ StringTable u = std::move(t);
+ EXPECT_EQ(1, u.size());
+ EXPECT_THAT(*u.find("a"), Pair("a", "b"));
+ }
+}
+
+TEST(Table, MoveConstructWithAlloc) {
+ StringTable t;
+ t.emplace("a", "b");
+ EXPECT_EQ(1, t.size());
+ StringTable u(std::move(t), Alloc<std::pair<std::string, std::string>>());
+ EXPECT_EQ(1, u.size());
+ EXPECT_THAT(*u.find("a"), Pair("a", "b"));
+}
+
+TEST(Table, CopyAssign) {
+ StringTable t;
+ t.emplace("a", "b");
+ EXPECT_EQ(1, t.size());
+ StringTable u;
+ u = t;
+ EXPECT_EQ(1, u.size());
+ EXPECT_THAT(*u.find("a"), Pair("a", "b"));
+}
+
+TEST(Table, CopySelfAssign) {
+ StringTable t;
+ t.emplace("a", "b");
+ EXPECT_EQ(1, t.size());
+ t = *&t;
+ EXPECT_EQ(1, t.size());
+ EXPECT_THAT(*t.find("a"), Pair("a", "b"));
+}
+
+TEST(Table, MoveAssign) {
+ StringTable t;
+ t.emplace("a", "b");
+ EXPECT_EQ(1, t.size());
+ StringTable u;
+ u = std::move(t);
+ EXPECT_EQ(1, u.size());
+ EXPECT_THAT(*u.find("a"), Pair("a", "b"));
+}
+
+TEST(Table, Equality) {
+ StringTable t;
+ std::vector<std::pair<std::string, std::string>> v = {{"a", "b"},
+ {"aa", "bb"}};
+ t.insert(std::begin(v), std::end(v));
+ StringTable u = t;
+ EXPECT_EQ(u, t);
+}
+
+TEST(Table, Equality2) {
+ StringTable t;
+ std::vector<std::pair<std::string, std::string>> v1 = {{"a", "b"},
+ {"aa", "bb"}};
+ t.insert(std::begin(v1), std::end(v1));
+ StringTable u;
+ std::vector<std::pair<std::string, std::string>> v2 = {{"a", "a"},
+ {"aa", "aa"}};
+ u.insert(std::begin(v2), std::end(v2));
+ EXPECT_NE(u, t);
+}
+
+TEST(Table, Equality3) {
+ StringTable t;
+ std::vector<std::pair<std::string, std::string>> v1 = {{"b", "b"},
+ {"bb", "bb"}};
+ t.insert(std::begin(v1), std::end(v1));
+ StringTable u;
+ std::vector<std::pair<std::string, std::string>> v2 = {{"a", "a"},
+ {"aa", "aa"}};
+ u.insert(std::begin(v2), std::end(v2));
+ EXPECT_NE(u, t);
+}
+
+TEST(Table, NumDeletedRegression) {
+ IntTable t;
+ t.emplace(0);
+ t.erase(t.find(0));
+ // construct over a deleted slot.
+ t.emplace(0);
+ t.clear();
+}
+
+TEST(Table, FindFullDeletedRegression) {
+ IntTable t;
+ for (int i = 0; i < 1000; ++i) {
+ t.emplace(i);
+ t.erase(t.find(i));
+ }
+ EXPECT_EQ(0, t.size());
+}
+
+TEST(Table, ReplacingDeletedSlotDoesNotRehash) {
+ size_t n;
+ {
+ // Compute n such that n is the maximum number of elements before rehash.
+ IntTable t;
+ t.emplace(0);
+ size_t c = t.bucket_count();
+ for (n = 1; c == t.bucket_count(); ++n) t.emplace(n);
+ --n;
+ }
+ IntTable t;
+ t.rehash(n);
+ const size_t c = t.bucket_count();
+ for (size_t i = 0; i != n; ++i) t.emplace(i);
+ EXPECT_EQ(c, t.bucket_count()) << "rehashing threshold = " << n;
+ t.erase(0);
+ t.emplace(0);
+ EXPECT_EQ(c, t.bucket_count()) << "rehashing threshold = " << n;
+}
+
+TEST(Table, NoThrowMoveConstruct) {
+ ASSERT_TRUE(
+ std::is_nothrow_copy_constructible<absl::Hash<absl::string_view>>::value);
+ ASSERT_TRUE(std::is_nothrow_copy_constructible<
+ std::equal_to<absl::string_view>>::value);
+ ASSERT_TRUE(std::is_nothrow_copy_constructible<std::allocator<int>>::value);
+ EXPECT_TRUE(std::is_nothrow_move_constructible<StringTable>::value);
+}
+
+TEST(Table, NoThrowMoveAssign) {
+ ASSERT_TRUE(
+ std::is_nothrow_move_assignable<absl::Hash<absl::string_view>>::value);
+ ASSERT_TRUE(
+ std::is_nothrow_move_assignable<std::equal_to<absl::string_view>>::value);
+ ASSERT_TRUE(std::is_nothrow_move_assignable<std::allocator<int>>::value);
+ ASSERT_TRUE(
+ absl::allocator_traits<std::allocator<int>>::is_always_equal::value);
+ EXPECT_TRUE(std::is_nothrow_move_assignable<StringTable>::value);
+}
+
+TEST(Table, NoThrowSwappable) {
+ ASSERT_TRUE(
+ container_internal::IsNoThrowSwappable<absl::Hash<absl::string_view>>());
+ ASSERT_TRUE(container_internal::IsNoThrowSwappable<
+ std::equal_to<absl::string_view>>());
+ ASSERT_TRUE(container_internal::IsNoThrowSwappable<std::allocator<int>>());
+ EXPECT_TRUE(container_internal::IsNoThrowSwappable<StringTable>());
+}
+
+TEST(Table, HeterogeneousLookup) {
+ struct Hash {
+ size_t operator()(int64_t i) const { return i; }
+ size_t operator()(double i) const {
+ ADD_FAILURE();
+ return i;
+ }
+ };
+ struct Eq {
+ bool operator()(int64_t a, int64_t b) const { return a == b; }
+ bool operator()(double a, int64_t b) const {
+ ADD_FAILURE();
+ return a == b;
+ }
+ bool operator()(int64_t a, double b) const {
+ ADD_FAILURE();
+ return a == b;
+ }
+ bool operator()(double a, double b) const {
+ ADD_FAILURE();
+ return a == b;
+ }
+ };
+
+ struct THash {
+ using is_transparent = void;
+ size_t operator()(int64_t i) const { return i; }
+ size_t operator()(double i) const { return i; }
+ };
+ struct TEq {
+ using is_transparent = void;
+ bool operator()(int64_t a, int64_t b) const { return a == b; }
+ bool operator()(double a, int64_t b) const { return a == b; }
+ bool operator()(int64_t a, double b) const { return a == b; }
+ bool operator()(double a, double b) const { return a == b; }
+ };
+
+ raw_hash_set<IntPolicy, Hash, Eq, Alloc<int64_t>> s{0, 1, 2};
+ // It will convert to int64_t before the query.
+ EXPECT_EQ(1, *s.find(double{1.1}));
+
+ raw_hash_set<IntPolicy, THash, TEq, Alloc<int64_t>> ts{0, 1, 2};
+ // It will try to use the double, and fail to find the object.
+ EXPECT_TRUE(ts.find(1.1) == ts.end());
+}
+
+template <class Table>
+using CallFind = decltype(std::declval<Table&>().find(17));
+
+template <class Table>
+using CallErase = decltype(std::declval<Table&>().erase(17));
+
+template <class Table>
+using CallExtract = decltype(std::declval<Table&>().extract(17));
+
+template <class Table>
+using CallPrefetch = decltype(std::declval<Table&>().prefetch(17));
+
+template <class Table>
+using CallCount = decltype(std::declval<Table&>().count(17));
+
+template <template <typename> class C, class Table, class = void>
+struct VerifyResultOf : std::false_type {};
+
+template <template <typename> class C, class Table>
+struct VerifyResultOf<C, Table, absl::void_t<C<Table>>> : std::true_type {};
+
+TEST(Table, HeterogeneousLookupOverloads) {
+ using NonTransparentTable =
+ raw_hash_set<StringPolicy, absl::Hash<absl::string_view>,
+ std::equal_to<absl::string_view>, std::allocator<int>>;
+
+ EXPECT_FALSE((VerifyResultOf<CallFind, NonTransparentTable>()));
+ EXPECT_FALSE((VerifyResultOf<CallErase, NonTransparentTable>()));
+ EXPECT_FALSE((VerifyResultOf<CallExtract, NonTransparentTable>()));
+ EXPECT_FALSE((VerifyResultOf<CallPrefetch, NonTransparentTable>()));
+ EXPECT_FALSE((VerifyResultOf<CallCount, NonTransparentTable>()));
+
+ using TransparentTable = raw_hash_set<
+ StringPolicy,
+ absl::container_internal::hash_default_hash<absl::string_view>,
+ absl::container_internal::hash_default_eq<absl::string_view>,
+ std::allocator<int>>;
+
+ EXPECT_TRUE((VerifyResultOf<CallFind, TransparentTable>()));
+ EXPECT_TRUE((VerifyResultOf<CallErase, TransparentTable>()));
+ EXPECT_TRUE((VerifyResultOf<CallExtract, TransparentTable>()));
+ EXPECT_TRUE((VerifyResultOf<CallPrefetch, TransparentTable>()));
+ EXPECT_TRUE((VerifyResultOf<CallCount, TransparentTable>()));
+}
+
+// TODO(alkis): Expand iterator tests.
+TEST(Iterator, IsDefaultConstructible) {
+ StringTable::iterator i;
+ EXPECT_TRUE(i == StringTable::iterator());
+}
+
+TEST(ConstIterator, IsDefaultConstructible) {
+ StringTable::const_iterator i;
+ EXPECT_TRUE(i == StringTable::const_iterator());
+}
+
+TEST(Iterator, ConvertsToConstIterator) {
+ StringTable::iterator i;
+ EXPECT_TRUE(i == StringTable::const_iterator());
+}
+
+TEST(Iterator, Iterates) {
+ IntTable t;
+ for (size_t i = 3; i != 6; ++i) EXPECT_TRUE(t.emplace(i).second);
+ EXPECT_THAT(t, UnorderedElementsAre(3, 4, 5));
+}
+
+TEST(Table, Merge) {
+ StringTable t1, t2;
+ t1.emplace("0", "-0");
+ t1.emplace("1", "-1");
+ t2.emplace("0", "~0");
+ t2.emplace("2", "~2");
+
+ EXPECT_THAT(t1, UnorderedElementsAre(Pair("0", "-0"), Pair("1", "-1")));
+ EXPECT_THAT(t2, UnorderedElementsAre(Pair("0", "~0"), Pair("2", "~2")));
+
+ t1.merge(t2);
+ EXPECT_THAT(t1, UnorderedElementsAre(Pair("0", "-0"), Pair("1", "-1"),
+ Pair("2", "~2")));
+ EXPECT_THAT(t2, UnorderedElementsAre(Pair("0", "~0")));
+}
+
+TEST(Nodes, EmptyNodeType) {
+ using node_type = StringTable::node_type;
+ node_type n;
+ EXPECT_FALSE(n);
+ EXPECT_TRUE(n.empty());
+
+ EXPECT_TRUE((std::is_same<node_type::allocator_type,
+ StringTable::allocator_type>::value));
+}
+
+TEST(Nodes, ExtractInsert) {
+ constexpr char k0[] = "Very long string zero.";
+ constexpr char k1[] = "Very long string one.";
+ constexpr char k2[] = "Very long string two.";
+ StringTable t = {{k0, ""}, {k1, ""}, {k2, ""}};
+ EXPECT_THAT(t,
+ UnorderedElementsAre(Pair(k0, ""), Pair(k1, ""), Pair(k2, "")));
+
+ auto node = t.extract(k0);
+ EXPECT_THAT(t, UnorderedElementsAre(Pair(k1, ""), Pair(k2, "")));
+ EXPECT_TRUE(node);
+ EXPECT_FALSE(node.empty());
+
+ StringTable t2;
+ StringTable::insert_return_type res = t2.insert(std::move(node));
+ EXPECT_TRUE(res.inserted);
+ EXPECT_THAT(*res.position, Pair(k0, ""));
+ EXPECT_FALSE(res.node);
+ EXPECT_THAT(t2, UnorderedElementsAre(Pair(k0, "")));
+
+ // Not there.
+ EXPECT_THAT(t, UnorderedElementsAre(Pair(k1, ""), Pair(k2, "")));
+ node = t.extract("Not there!");
+ EXPECT_THAT(t, UnorderedElementsAre(Pair(k1, ""), Pair(k2, "")));
+ EXPECT_FALSE(node);
+
+ // Inserting nothing.
+ res = t2.insert(std::move(node));
+ EXPECT_FALSE(res.inserted);
+ EXPECT_EQ(res.position, t2.end());
+ EXPECT_FALSE(res.node);
+ EXPECT_THAT(t2, UnorderedElementsAre(Pair(k0, "")));
+
+ t.emplace(k0, "1");
+ node = t.extract(k0);
+
+ // Insert duplicate.
+ res = t2.insert(std::move(node));
+ EXPECT_FALSE(res.inserted);
+ EXPECT_THAT(*res.position, Pair(k0, ""));
+ EXPECT_TRUE(res.node);
+ EXPECT_FALSE(node);
+}
+
+TEST(Nodes, HintInsert) {
+ IntTable t = {1, 2, 3};
+ auto node = t.extract(1);
+ EXPECT_THAT(t, UnorderedElementsAre(2, 3));
+ auto it = t.insert(t.begin(), std::move(node));
+ EXPECT_THAT(t, UnorderedElementsAre(1, 2, 3));
+ EXPECT_EQ(*it, 1);
+ EXPECT_FALSE(node);
+
+ node = t.extract(2);
+ EXPECT_THAT(t, UnorderedElementsAre(1, 3));
+ // reinsert 2 to make the next insert fail.
+ t.insert(2);
+ EXPECT_THAT(t, UnorderedElementsAre(1, 2, 3));
+ it = t.insert(t.begin(), std::move(node));
+ EXPECT_EQ(*it, 2);
+ // The node was not emptied by the insert call.
+ EXPECT_TRUE(node);
+}
+
+IntTable MakeSimpleTable(size_t size) {
+ IntTable t;
+ while (t.size() < size) t.insert(t.size());
+ return t;
+}
+
+std::vector<int> OrderOfIteration(const IntTable& t) {
+ return {t.begin(), t.end()};
+}
+
+// These IterationOrderChanges tests depend on non-deterministic behavior.
+// We are injecting non-determinism from the pointer of the table, but do so in
+// a way that only the page matters. We have to retry enough times to make sure
+// we are touching different memory pages to cause the ordering to change.
+// We also need to keep the old tables around to avoid getting the same memory
+// blocks over and over.
+TEST(Table, IterationOrderChangesByInstance) {
+ for (size_t size : {2, 6, 12, 20}) {
+ const auto reference_table = MakeSimpleTable(size);
+ const auto reference = OrderOfIteration(reference_table);
+
+ std::vector<IntTable> tables;
+ bool found_difference = false;
+ for (int i = 0; !found_difference && i < 5000; ++i) {
+ tables.push_back(MakeSimpleTable(size));
+ found_difference = OrderOfIteration(tables.back()) != reference;
+ }
+ if (!found_difference) {
+ FAIL()
+ << "Iteration order remained the same across many attempts with size "
+ << size;
+ }
+ }
+}
+
+TEST(Table, IterationOrderChangesOnRehash) {
+ std::vector<IntTable> garbage;
+ for (int i = 0; i < 5000; ++i) {
+ auto t = MakeSimpleTable(20);
+ const auto reference = OrderOfIteration(t);
+ // Force rehash to the same size.
+ t.rehash(0);
+ auto trial = OrderOfIteration(t);
+ if (trial != reference) {
+ // We are done.
+ return;
+ }
+ garbage.push_back(std::move(t));
+ }
+ FAIL() << "Iteration order remained the same across many attempts.";
+}
+
+// Verify that pointers are invalidated as soon as a second element is inserted.
+// This prevents dependency on pointer stability on small tables.
+TEST(Table, UnstablePointers) {
+ IntTable table;
+
+ const auto addr = [&](int i) {
+ return reinterpret_cast<uintptr_t>(&*table.find(i));
+ };
+
+ table.insert(0);
+ const uintptr_t old_ptr = addr(0);
+
+ // This causes a rehash.
+ table.insert(1);
+
+ EXPECT_NE(old_ptr, addr(0));
+}
+
+// Confirm that we assert if we try to erase() end().
+TEST(TableDeathTest, EraseOfEndAsserts) {
+ // Use an assert with side-effects to figure out if they are actually enabled.
+ bool assert_enabled = false;
+ assert([&]() {
+ assert_enabled = true;
+ return true;
+ }());
+ if (!assert_enabled) return;
+
+ IntTable t;
+ // Extra simple "regexp" as regexp support is highly varied across platforms.
+ constexpr char kDeathMsg[] = "Invalid operation on iterator";
+ EXPECT_DEATH_IF_SUPPORTED(t.erase(t.end()), kDeathMsg);
+}
+
+#if defined(ABSL_INTERNAL_HASHTABLEZ_SAMPLE)
+TEST(RawHashSamplerTest, Sample) {
+ // Enable the feature even if the prod default is off.
+ SetHashtablezEnabled(true);
+ SetHashtablezSampleParameter(100);
+
+ auto& sampler = HashtablezSampler::Global();
+ size_t start_size = 0;
+ start_size += sampler.Iterate([&](const HashtablezInfo&) { ++start_size; });
+
+ std::vector<IntTable> tables;
+ for (int i = 0; i < 1000000; ++i) {
+ tables.emplace_back();
+ tables.back().insert(1);
+ }
+ size_t end_size = 0;
+ end_size += sampler.Iterate([&](const HashtablezInfo&) { ++end_size; });
+
+ EXPECT_NEAR((end_size - start_size) / static_cast<double>(tables.size()),
+ 0.01, 0.005);
+}
+#endif // ABSL_INTERNAL_HASHTABLEZ_SAMPLE
+
+TEST(RawHashSamplerTest, DoNotSampleCustomAllocators) {
+ // Enable the feature even if the prod default is off.
+ SetHashtablezEnabled(true);
+ SetHashtablezSampleParameter(100);
+
+ auto& sampler = HashtablezSampler::Global();
+ size_t start_size = 0;
+ start_size += sampler.Iterate([&](const HashtablezInfo&) { ++start_size; });
+
+ std::vector<CustomAllocIntTable> tables;
+ for (int i = 0; i < 1000000; ++i) {
+ tables.emplace_back();
+ tables.back().insert(1);
+ }
+ size_t end_size = 0;
+ end_size += sampler.Iterate([&](const HashtablezInfo&) { ++end_size; });
+
+ EXPECT_NEAR((end_size - start_size) / static_cast<double>(tables.size()),
+ 0.00, 0.001);
+}
+
+#ifdef ABSL_HAVE_ADDRESS_SANITIZER
+TEST(Sanitizer, PoisoningUnused) {
+ IntTable t;
+ t.reserve(5);
+ // Insert something to force an allocation.
+ int64_t& v1 = *t.insert(0).first;
+
+ // Make sure there is something to test.
+ ASSERT_GT(t.capacity(), 1);
+
+ int64_t* slots = RawHashSetTestOnlyAccess::GetSlots(t);
+ for (size_t i = 0; i < t.capacity(); ++i) {
+ EXPECT_EQ(slots + i != &v1, __asan_address_is_poisoned(slots + i));
+ }
+}
+
+TEST(Sanitizer, PoisoningOnErase) {
+ IntTable t;
+ int64_t& v = *t.insert(0).first;
+
+ EXPECT_FALSE(__asan_address_is_poisoned(&v));
+ t.erase(0);
+ EXPECT_TRUE(__asan_address_is_poisoned(&v));
+}
+#endif // ABSL_HAVE_ADDRESS_SANITIZER
+
+} // namespace
+} // namespace container_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/container/internal/test_instance_tracker.cc b/third_party/abseil/src/absl/container/internal/test_instance_tracker.cc
new file mode 100644
index 0000000..f9947f0
--- /dev/null
+++ b/third_party/abseil/src/absl/container/internal/test_instance_tracker.cc
@@ -0,0 +1,29 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/container/internal/test_instance_tracker.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace test_internal {
+int BaseCountedInstance::num_instances_ = 0;
+int BaseCountedInstance::num_live_instances_ = 0;
+int BaseCountedInstance::num_moves_ = 0;
+int BaseCountedInstance::num_copies_ = 0;
+int BaseCountedInstance::num_swaps_ = 0;
+int BaseCountedInstance::num_comparisons_ = 0;
+
+} // namespace test_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/container/internal/test_instance_tracker.h b/third_party/abseil/src/absl/container/internal/test_instance_tracker.h
new file mode 100644
index 0000000..5ff6fd7
--- /dev/null
+++ b/third_party/abseil/src/absl/container/internal/test_instance_tracker.h
@@ -0,0 +1,274 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_CONTAINER_INTERNAL_TEST_INSTANCE_TRACKER_H_
+#define ABSL_CONTAINER_INTERNAL_TEST_INSTANCE_TRACKER_H_
+
+#include <cstdlib>
+#include <ostream>
+
+#include "absl/types/compare.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace test_internal {
+
+// A type that counts number of occurrences of the type, the live occurrences of
+// the type, as well as the number of copies, moves, swaps, and comparisons that
+// have occurred on the type. This is used as a base class for the copyable,
+// copyable+movable, and movable types below that are used in actual tests. Use
+// InstanceTracker in tests to track the number of instances.
+class BaseCountedInstance {
+ public:
+ explicit BaseCountedInstance(int x) : value_(x) {
+ ++num_instances_;
+ ++num_live_instances_;
+ }
+ BaseCountedInstance(const BaseCountedInstance& x)
+ : value_(x.value_), is_live_(x.is_live_) {
+ ++num_instances_;
+ if (is_live_) ++num_live_instances_;
+ ++num_copies_;
+ }
+ BaseCountedInstance(BaseCountedInstance&& x)
+ : value_(x.value_), is_live_(x.is_live_) {
+ x.is_live_ = false;
+ ++num_instances_;
+ ++num_moves_;
+ }
+ ~BaseCountedInstance() {
+ --num_instances_;
+ if (is_live_) --num_live_instances_;
+ }
+
+ BaseCountedInstance& operator=(const BaseCountedInstance& x) {
+ value_ = x.value_;
+ if (is_live_) --num_live_instances_;
+ is_live_ = x.is_live_;
+ if (is_live_) ++num_live_instances_;
+ ++num_copies_;
+ return *this;
+ }
+ BaseCountedInstance& operator=(BaseCountedInstance&& x) {
+ value_ = x.value_;
+ if (is_live_) --num_live_instances_;
+ is_live_ = x.is_live_;
+ x.is_live_ = false;
+ ++num_moves_;
+ return *this;
+ }
+
+ bool operator==(const BaseCountedInstance& x) const {
+ ++num_comparisons_;
+ return value_ == x.value_;
+ }
+
+ bool operator!=(const BaseCountedInstance& x) const {
+ ++num_comparisons_;
+ return value_ != x.value_;
+ }
+
+ bool operator<(const BaseCountedInstance& x) const {
+ ++num_comparisons_;
+ return value_ < x.value_;
+ }
+
+ bool operator>(const BaseCountedInstance& x) const {
+ ++num_comparisons_;
+ return value_ > x.value_;
+ }
+
+ bool operator<=(const BaseCountedInstance& x) const {
+ ++num_comparisons_;
+ return value_ <= x.value_;
+ }
+
+ bool operator>=(const BaseCountedInstance& x) const {
+ ++num_comparisons_;
+ return value_ >= x.value_;
+ }
+
+ absl::weak_ordering compare(const BaseCountedInstance& x) const {
+ ++num_comparisons_;
+ return value_ < x.value_
+ ? absl::weak_ordering::less
+ : value_ == x.value_ ? absl::weak_ordering::equivalent
+ : absl::weak_ordering::greater;
+ }
+
+ int value() const {
+ if (!is_live_) std::abort();
+ return value_;
+ }
+
+ friend std::ostream& operator<<(std::ostream& o,
+ const BaseCountedInstance& v) {
+ return o << "[value:" << v.value() << "]";
+ }
+
+ // Implementation of efficient swap() that counts swaps.
+ static void SwapImpl(
+ BaseCountedInstance& lhs, // NOLINT(runtime/references)
+ BaseCountedInstance& rhs) { // NOLINT(runtime/references)
+ using std::swap;
+ swap(lhs.value_, rhs.value_);
+ swap(lhs.is_live_, rhs.is_live_);
+ ++BaseCountedInstance::num_swaps_;
+ }
+
+ private:
+ friend class InstanceTracker;
+
+ int value_;
+
+ // Indicates if the value is live, ie it hasn't been moved away from.
+ bool is_live_ = true;
+
+ // Number of instances.
+ static int num_instances_;
+
+ // Number of live instances (those that have not been moved away from.)
+ static int num_live_instances_;
+
+ // Number of times that BaseCountedInstance objects were moved.
+ static int num_moves_;
+
+ // Number of times that BaseCountedInstance objects were copied.
+ static int num_copies_;
+
+ // Number of times that BaseCountedInstance objects were swapped.
+ static int num_swaps_;
+
+ // Number of times that BaseCountedInstance objects were compared.
+ static int num_comparisons_;
+};
+
+// Helper to track the BaseCountedInstance instance counters. Expects that the
+// number of instances and live_instances are the same when it is constructed
+// and when it is destructed.
+class InstanceTracker {
+ public:
+ InstanceTracker()
+ : start_instances_(BaseCountedInstance::num_instances_),
+ start_live_instances_(BaseCountedInstance::num_live_instances_) {
+ ResetCopiesMovesSwaps();
+ }
+ ~InstanceTracker() {
+ if (instances() != 0) std::abort();
+ if (live_instances() != 0) std::abort();
+ }
+
+ // Returns the number of BaseCountedInstance instances both containing valid
+ // values and those moved away from compared to when the InstanceTracker was
+ // constructed
+ int instances() const {
+ return BaseCountedInstance::num_instances_ - start_instances_;
+ }
+
+ // Returns the number of live BaseCountedInstance instances compared to when
+ // the InstanceTracker was constructed
+ int live_instances() const {
+ return BaseCountedInstance::num_live_instances_ - start_live_instances_;
+ }
+
+ // Returns the number of moves on BaseCountedInstance objects since
+ // construction or since the last call to ResetCopiesMovesSwaps().
+ int moves() const { return BaseCountedInstance::num_moves_ - start_moves_; }
+
+ // Returns the number of copies on BaseCountedInstance objects since
+ // construction or the last call to ResetCopiesMovesSwaps().
+ int copies() const {
+ return BaseCountedInstance::num_copies_ - start_copies_;
+ }
+
+ // Returns the number of swaps on BaseCountedInstance objects since
+ // construction or the last call to ResetCopiesMovesSwaps().
+ int swaps() const { return BaseCountedInstance::num_swaps_ - start_swaps_; }
+
+ // Returns the number of comparisons on BaseCountedInstance objects since
+ // construction or the last call to ResetCopiesMovesSwaps().
+ int comparisons() const {
+ return BaseCountedInstance::num_comparisons_ - start_comparisons_;
+ }
+
+ // Resets the base values for moves, copies, comparisons, and swaps to the
+ // current values, so that subsequent Get*() calls for moves, copies,
+ // comparisons, and swaps will compare to the situation at the point of this
+ // call.
+ void ResetCopiesMovesSwaps() {
+ start_moves_ = BaseCountedInstance::num_moves_;
+ start_copies_ = BaseCountedInstance::num_copies_;
+ start_swaps_ = BaseCountedInstance::num_swaps_;
+ start_comparisons_ = BaseCountedInstance::num_comparisons_;
+ }
+
+ private:
+ int start_instances_;
+ int start_live_instances_;
+ int start_moves_;
+ int start_copies_;
+ int start_swaps_;
+ int start_comparisons_;
+};
+
+// Copyable, not movable.
+class CopyableOnlyInstance : public BaseCountedInstance {
+ public:
+ explicit CopyableOnlyInstance(int x) : BaseCountedInstance(x) {}
+ CopyableOnlyInstance(const CopyableOnlyInstance& rhs) = default;
+ CopyableOnlyInstance& operator=(const CopyableOnlyInstance& rhs) = default;
+
+ friend void swap(CopyableOnlyInstance& lhs, CopyableOnlyInstance& rhs) {
+ BaseCountedInstance::SwapImpl(lhs, rhs);
+ }
+
+ static bool supports_move() { return false; }
+};
+
+// Copyable and movable.
+class CopyableMovableInstance : public BaseCountedInstance {
+ public:
+ explicit CopyableMovableInstance(int x) : BaseCountedInstance(x) {}
+ CopyableMovableInstance(const CopyableMovableInstance& rhs) = default;
+ CopyableMovableInstance(CopyableMovableInstance&& rhs) = default;
+ CopyableMovableInstance& operator=(const CopyableMovableInstance& rhs) =
+ default;
+ CopyableMovableInstance& operator=(CopyableMovableInstance&& rhs) = default;
+
+ friend void swap(CopyableMovableInstance& lhs, CopyableMovableInstance& rhs) {
+ BaseCountedInstance::SwapImpl(lhs, rhs);
+ }
+
+ static bool supports_move() { return true; }
+};
+
+// Only movable, not default-constructible.
+class MovableOnlyInstance : public BaseCountedInstance {
+ public:
+ explicit MovableOnlyInstance(int x) : BaseCountedInstance(x) {}
+ MovableOnlyInstance(MovableOnlyInstance&& other) = default;
+ MovableOnlyInstance& operator=(MovableOnlyInstance&& other) = default;
+
+ friend void swap(MovableOnlyInstance& lhs, MovableOnlyInstance& rhs) {
+ BaseCountedInstance::SwapImpl(lhs, rhs);
+ }
+
+ static bool supports_move() { return true; }
+};
+
+} // namespace test_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_CONTAINER_INTERNAL_TEST_INSTANCE_TRACKER_H_
diff --git a/third_party/abseil/src/absl/container/internal/test_instance_tracker_test.cc b/third_party/abseil/src/absl/container/internal/test_instance_tracker_test.cc
new file mode 100644
index 0000000..1c6a4fa
--- /dev/null
+++ b/third_party/abseil/src/absl/container/internal/test_instance_tracker_test.cc
@@ -0,0 +1,184 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/container/internal/test_instance_tracker.h"
+
+#include "gtest/gtest.h"
+
+namespace {
+
+using absl::test_internal::CopyableMovableInstance;
+using absl::test_internal::CopyableOnlyInstance;
+using absl::test_internal::InstanceTracker;
+using absl::test_internal::MovableOnlyInstance;
+
+TEST(TestInstanceTracker, CopyableMovable) {
+ InstanceTracker tracker;
+ CopyableMovableInstance src(1);
+ EXPECT_EQ(1, src.value()) << src;
+ CopyableMovableInstance copy(src);
+ CopyableMovableInstance move(std::move(src));
+ EXPECT_EQ(1, tracker.copies());
+ EXPECT_EQ(1, tracker.moves());
+ EXPECT_EQ(0, tracker.swaps());
+ EXPECT_EQ(3, tracker.instances());
+ EXPECT_EQ(2, tracker.live_instances());
+ tracker.ResetCopiesMovesSwaps();
+
+ CopyableMovableInstance copy_assign(1);
+ copy_assign = copy;
+ CopyableMovableInstance move_assign(1);
+ move_assign = std::move(move);
+ EXPECT_EQ(1, tracker.copies());
+ EXPECT_EQ(1, tracker.moves());
+ EXPECT_EQ(0, tracker.swaps());
+ EXPECT_EQ(5, tracker.instances());
+ EXPECT_EQ(3, tracker.live_instances());
+ tracker.ResetCopiesMovesSwaps();
+
+ {
+ using std::swap;
+ swap(move_assign, copy);
+ swap(copy, move_assign);
+ EXPECT_EQ(2, tracker.swaps());
+ EXPECT_EQ(0, tracker.copies());
+ EXPECT_EQ(0, tracker.moves());
+ EXPECT_EQ(5, tracker.instances());
+ EXPECT_EQ(3, tracker.live_instances());
+ }
+}
+
+TEST(TestInstanceTracker, CopyableOnly) {
+ InstanceTracker tracker;
+ CopyableOnlyInstance src(1);
+ EXPECT_EQ(1, src.value()) << src;
+ CopyableOnlyInstance copy(src);
+ CopyableOnlyInstance copy2(std::move(src)); // NOLINT
+ EXPECT_EQ(2, tracker.copies());
+ EXPECT_EQ(0, tracker.moves());
+ EXPECT_EQ(3, tracker.instances());
+ EXPECT_EQ(3, tracker.live_instances());
+ tracker.ResetCopiesMovesSwaps();
+
+ CopyableOnlyInstance copy_assign(1);
+ copy_assign = copy;
+ CopyableOnlyInstance copy_assign2(1);
+ copy_assign2 = std::move(copy2); // NOLINT
+ EXPECT_EQ(2, tracker.copies());
+ EXPECT_EQ(0, tracker.moves());
+ EXPECT_EQ(5, tracker.instances());
+ EXPECT_EQ(5, tracker.live_instances());
+ tracker.ResetCopiesMovesSwaps();
+
+ {
+ using std::swap;
+ swap(src, copy);
+ swap(copy, src);
+ EXPECT_EQ(2, tracker.swaps());
+ EXPECT_EQ(0, tracker.copies());
+ EXPECT_EQ(0, tracker.moves());
+ EXPECT_EQ(5, tracker.instances());
+ EXPECT_EQ(5, tracker.live_instances());
+ }
+}
+
+TEST(TestInstanceTracker, MovableOnly) {
+ InstanceTracker tracker;
+ MovableOnlyInstance src(1);
+ EXPECT_EQ(1, src.value()) << src;
+ MovableOnlyInstance move(std::move(src));
+ MovableOnlyInstance move_assign(2);
+ move_assign = std::move(move);
+ EXPECT_EQ(3, tracker.instances());
+ EXPECT_EQ(1, tracker.live_instances());
+ EXPECT_EQ(2, tracker.moves());
+ EXPECT_EQ(0, tracker.copies());
+ tracker.ResetCopiesMovesSwaps();
+
+ {
+ using std::swap;
+ MovableOnlyInstance other(2);
+ swap(move_assign, other);
+ swap(other, move_assign);
+ EXPECT_EQ(2, tracker.swaps());
+ EXPECT_EQ(0, tracker.copies());
+ EXPECT_EQ(0, tracker.moves());
+ EXPECT_EQ(4, tracker.instances());
+ EXPECT_EQ(2, tracker.live_instances());
+ }
+}
+
+TEST(TestInstanceTracker, ExistingInstances) {
+ CopyableMovableInstance uncounted_instance(1);
+ CopyableMovableInstance uncounted_live_instance(
+ std::move(uncounted_instance));
+ InstanceTracker tracker;
+ EXPECT_EQ(0, tracker.instances());
+ EXPECT_EQ(0, tracker.live_instances());
+ EXPECT_EQ(0, tracker.copies());
+ {
+ CopyableMovableInstance instance1(1);
+ EXPECT_EQ(1, tracker.instances());
+ EXPECT_EQ(1, tracker.live_instances());
+ EXPECT_EQ(0, tracker.copies());
+ EXPECT_EQ(0, tracker.moves());
+ {
+ InstanceTracker tracker2;
+ CopyableMovableInstance instance2(instance1);
+ CopyableMovableInstance instance3(std::move(instance2));
+ EXPECT_EQ(3, tracker.instances());
+ EXPECT_EQ(2, tracker.live_instances());
+ EXPECT_EQ(1, tracker.copies());
+ EXPECT_EQ(1, tracker.moves());
+ EXPECT_EQ(2, tracker2.instances());
+ EXPECT_EQ(1, tracker2.live_instances());
+ EXPECT_EQ(1, tracker2.copies());
+ EXPECT_EQ(1, tracker2.moves());
+ }
+ EXPECT_EQ(1, tracker.instances());
+ EXPECT_EQ(1, tracker.live_instances());
+ EXPECT_EQ(1, tracker.copies());
+ EXPECT_EQ(1, tracker.moves());
+ }
+ EXPECT_EQ(0, tracker.instances());
+ EXPECT_EQ(0, tracker.live_instances());
+ EXPECT_EQ(1, tracker.copies());
+ EXPECT_EQ(1, tracker.moves());
+}
+
+TEST(TestInstanceTracker, Comparisons) {
+ InstanceTracker tracker;
+ MovableOnlyInstance one(1), two(2);
+
+ EXPECT_EQ(0, tracker.comparisons());
+ EXPECT_FALSE(one == two);
+ EXPECT_EQ(1, tracker.comparisons());
+ EXPECT_TRUE(one != two);
+ EXPECT_EQ(2, tracker.comparisons());
+ EXPECT_TRUE(one < two);
+ EXPECT_EQ(3, tracker.comparisons());
+ EXPECT_FALSE(one > two);
+ EXPECT_EQ(4, tracker.comparisons());
+ EXPECT_TRUE(one <= two);
+ EXPECT_EQ(5, tracker.comparisons());
+ EXPECT_FALSE(one >= two);
+ EXPECT_EQ(6, tracker.comparisons());
+ EXPECT_TRUE(one.compare(two) < 0); // NOLINT
+ EXPECT_EQ(7, tracker.comparisons());
+
+ tracker.ResetCopiesMovesSwaps();
+ EXPECT_EQ(0, tracker.comparisons());
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/container/internal/tracked.h b/third_party/abseil/src/absl/container/internal/tracked.h
new file mode 100644
index 0000000..29f5829
--- /dev/null
+++ b/third_party/abseil/src/absl/container/internal/tracked.h
@@ -0,0 +1,83 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_CONTAINER_INTERNAL_TRACKED_H_
+#define ABSL_CONTAINER_INTERNAL_TRACKED_H_
+
+#include <stddef.h>
+
+#include <memory>
+#include <utility>
+
+#include "absl/base/config.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace container_internal {
+
+// A class that tracks its copies and moves so that it can be queried in tests.
+template <class T>
+class Tracked {
+ public:
+ Tracked() {}
+ // NOLINTNEXTLINE(runtime/explicit)
+ Tracked(const T& val) : val_(val) {}
+ Tracked(const Tracked& that)
+ : val_(that.val_),
+ num_moves_(that.num_moves_),
+ num_copies_(that.num_copies_) {
+ ++(*num_copies_);
+ }
+ Tracked(Tracked&& that)
+ : val_(std::move(that.val_)),
+ num_moves_(std::move(that.num_moves_)),
+ num_copies_(std::move(that.num_copies_)) {
+ ++(*num_moves_);
+ }
+ Tracked& operator=(const Tracked& that) {
+ val_ = that.val_;
+ num_moves_ = that.num_moves_;
+ num_copies_ = that.num_copies_;
+ ++(*num_copies_);
+ }
+ Tracked& operator=(Tracked&& that) {
+ val_ = std::move(that.val_);
+ num_moves_ = std::move(that.num_moves_);
+ num_copies_ = std::move(that.num_copies_);
+ ++(*num_moves_);
+ }
+
+ const T& val() const { return val_; }
+
+ friend bool operator==(const Tracked& a, const Tracked& b) {
+ return a.val_ == b.val_;
+ }
+ friend bool operator!=(const Tracked& a, const Tracked& b) {
+ return !(a == b);
+ }
+
+ size_t num_copies() { return *num_copies_; }
+ size_t num_moves() { return *num_moves_; }
+
+ private:
+ T val_;
+ std::shared_ptr<size_t> num_moves_ = std::make_shared<size_t>(0);
+ std::shared_ptr<size_t> num_copies_ = std::make_shared<size_t>(0);
+};
+
+} // namespace container_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_CONTAINER_INTERNAL_TRACKED_H_
diff --git a/third_party/abseil/src/absl/container/internal/unordered_map_constructor_test.h b/third_party/abseil/src/absl/container/internal/unordered_map_constructor_test.h
new file mode 100644
index 0000000..76ee95e
--- /dev/null
+++ b/third_party/abseil/src/absl/container/internal/unordered_map_constructor_test.h
@@ -0,0 +1,489 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_CONTAINER_INTERNAL_UNORDERED_MAP_CONSTRUCTOR_TEST_H_
+#define ABSL_CONTAINER_INTERNAL_UNORDERED_MAP_CONSTRUCTOR_TEST_H_
+
+#include <algorithm>
+#include <vector>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/container/internal/hash_generator_testing.h"
+#include "absl/container/internal/hash_policy_testing.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace container_internal {
+
+template <class UnordMap>
+class ConstructorTest : public ::testing::Test {};
+
+TYPED_TEST_SUITE_P(ConstructorTest);
+
+TYPED_TEST_P(ConstructorTest, NoArgs) {
+ TypeParam m;
+ EXPECT_TRUE(m.empty());
+ EXPECT_THAT(m, ::testing::UnorderedElementsAre());
+}
+
+TYPED_TEST_P(ConstructorTest, BucketCount) {
+ TypeParam m(123);
+ EXPECT_TRUE(m.empty());
+ EXPECT_THAT(m, ::testing::UnorderedElementsAre());
+ EXPECT_GE(m.bucket_count(), 123);
+}
+
+TYPED_TEST_P(ConstructorTest, BucketCountHash) {
+ using H = typename TypeParam::hasher;
+ H hasher;
+ TypeParam m(123, hasher);
+ EXPECT_EQ(m.hash_function(), hasher);
+ EXPECT_TRUE(m.empty());
+ EXPECT_THAT(m, ::testing::UnorderedElementsAre());
+ EXPECT_GE(m.bucket_count(), 123);
+}
+
+TYPED_TEST_P(ConstructorTest, BucketCountHashEqual) {
+ using H = typename TypeParam::hasher;
+ using E = typename TypeParam::key_equal;
+ H hasher;
+ E equal;
+ TypeParam m(123, hasher, equal);
+ EXPECT_EQ(m.hash_function(), hasher);
+ EXPECT_EQ(m.key_eq(), equal);
+ EXPECT_TRUE(m.empty());
+ EXPECT_THAT(m, ::testing::UnorderedElementsAre());
+ EXPECT_GE(m.bucket_count(), 123);
+}
+
+TYPED_TEST_P(ConstructorTest, BucketCountHashEqualAlloc) {
+ using H = typename TypeParam::hasher;
+ using E = typename TypeParam::key_equal;
+ using A = typename TypeParam::allocator_type;
+ H hasher;
+ E equal;
+ A alloc(0);
+ TypeParam m(123, hasher, equal, alloc);
+ EXPECT_EQ(m.hash_function(), hasher);
+ EXPECT_EQ(m.key_eq(), equal);
+ EXPECT_EQ(m.get_allocator(), alloc);
+ EXPECT_TRUE(m.empty());
+ EXPECT_THAT(m, ::testing::UnorderedElementsAre());
+ EXPECT_GE(m.bucket_count(), 123);
+}
+
+template <typename T>
+struct is_std_unordered_map : std::false_type {};
+
+template <typename... T>
+struct is_std_unordered_map<std::unordered_map<T...>> : std::true_type {};
+
+#if defined(UNORDERED_MAP_CXX14) || defined(UNORDERED_MAP_CXX17)
+using has_cxx14_std_apis = std::true_type;
+#else
+using has_cxx14_std_apis = std::false_type;
+#endif
+
+template <typename T>
+using expect_cxx14_apis =
+ absl::disjunction<absl::negation<is_std_unordered_map<T>>,
+ has_cxx14_std_apis>;
+
+template <typename TypeParam>
+void BucketCountAllocTest(std::false_type) {}
+
+template <typename TypeParam>
+void BucketCountAllocTest(std::true_type) {
+ using A = typename TypeParam::allocator_type;
+ A alloc(0);
+ TypeParam m(123, alloc);
+ EXPECT_EQ(m.get_allocator(), alloc);
+ EXPECT_TRUE(m.empty());
+ EXPECT_THAT(m, ::testing::UnorderedElementsAre());
+ EXPECT_GE(m.bucket_count(), 123);
+}
+
+TYPED_TEST_P(ConstructorTest, BucketCountAlloc) {
+ BucketCountAllocTest<TypeParam>(expect_cxx14_apis<TypeParam>());
+}
+
+template <typename TypeParam>
+void BucketCountHashAllocTest(std::false_type) {}
+
+template <typename TypeParam>
+void BucketCountHashAllocTest(std::true_type) {
+ using H = typename TypeParam::hasher;
+ using A = typename TypeParam::allocator_type;
+ H hasher;
+ A alloc(0);
+ TypeParam m(123, hasher, alloc);
+ EXPECT_EQ(m.hash_function(), hasher);
+ EXPECT_EQ(m.get_allocator(), alloc);
+ EXPECT_TRUE(m.empty());
+ EXPECT_THAT(m, ::testing::UnorderedElementsAre());
+ EXPECT_GE(m.bucket_count(), 123);
+}
+
+TYPED_TEST_P(ConstructorTest, BucketCountHashAlloc) {
+ BucketCountHashAllocTest<TypeParam>(expect_cxx14_apis<TypeParam>());
+}
+
+#if ABSL_UNORDERED_SUPPORTS_ALLOC_CTORS
+using has_alloc_std_constructors = std::true_type;
+#else
+using has_alloc_std_constructors = std::false_type;
+#endif
+
+template <typename T>
+using expect_alloc_constructors =
+ absl::disjunction<absl::negation<is_std_unordered_map<T>>,
+ has_alloc_std_constructors>;
+
+template <typename TypeParam>
+void AllocTest(std::false_type) {}
+
+template <typename TypeParam>
+void AllocTest(std::true_type) {
+ using A = typename TypeParam::allocator_type;
+ A alloc(0);
+ TypeParam m(alloc);
+ EXPECT_EQ(m.get_allocator(), alloc);
+ EXPECT_TRUE(m.empty());
+ EXPECT_THAT(m, ::testing::UnorderedElementsAre());
+}
+
+TYPED_TEST_P(ConstructorTest, Alloc) {
+ AllocTest<TypeParam>(expect_alloc_constructors<TypeParam>());
+}
+
+TYPED_TEST_P(ConstructorTest, InputIteratorBucketHashEqualAlloc) {
+ using T = hash_internal::GeneratedType<TypeParam>;
+ using H = typename TypeParam::hasher;
+ using E = typename TypeParam::key_equal;
+ using A = typename TypeParam::allocator_type;
+ H hasher;
+ E equal;
+ A alloc(0);
+ std::vector<T> values;
+ std::generate_n(std::back_inserter(values), 10,
+ hash_internal::Generator<T>());
+ TypeParam m(values.begin(), values.end(), 123, hasher, equal, alloc);
+ EXPECT_EQ(m.hash_function(), hasher);
+ EXPECT_EQ(m.key_eq(), equal);
+ EXPECT_EQ(m.get_allocator(), alloc);
+ EXPECT_THAT(items(m), ::testing::UnorderedElementsAreArray(values));
+ EXPECT_GE(m.bucket_count(), 123);
+}
+
+template <typename TypeParam>
+void InputIteratorBucketAllocTest(std::false_type) {}
+
+template <typename TypeParam>
+void InputIteratorBucketAllocTest(std::true_type) {
+ using T = hash_internal::GeneratedType<TypeParam>;
+ using A = typename TypeParam::allocator_type;
+ A alloc(0);
+ std::vector<T> values;
+ std::generate_n(std::back_inserter(values), 10,
+ hash_internal::Generator<T>());
+ TypeParam m(values.begin(), values.end(), 123, alloc);
+ EXPECT_EQ(m.get_allocator(), alloc);
+ EXPECT_THAT(items(m), ::testing::UnorderedElementsAreArray(values));
+ EXPECT_GE(m.bucket_count(), 123);
+}
+
+TYPED_TEST_P(ConstructorTest, InputIteratorBucketAlloc) {
+ InputIteratorBucketAllocTest<TypeParam>(expect_cxx14_apis<TypeParam>());
+}
+
+template <typename TypeParam>
+void InputIteratorBucketHashAllocTest(std::false_type) {}
+
+template <typename TypeParam>
+void InputIteratorBucketHashAllocTest(std::true_type) {
+ using T = hash_internal::GeneratedType<TypeParam>;
+ using H = typename TypeParam::hasher;
+ using A = typename TypeParam::allocator_type;
+ H hasher;
+ A alloc(0);
+ std::vector<T> values;
+ std::generate_n(std::back_inserter(values), 10,
+ hash_internal::Generator<T>());
+ TypeParam m(values.begin(), values.end(), 123, hasher, alloc);
+ EXPECT_EQ(m.hash_function(), hasher);
+ EXPECT_EQ(m.get_allocator(), alloc);
+ EXPECT_THAT(items(m), ::testing::UnorderedElementsAreArray(values));
+ EXPECT_GE(m.bucket_count(), 123);
+}
+
+TYPED_TEST_P(ConstructorTest, InputIteratorBucketHashAlloc) {
+ InputIteratorBucketHashAllocTest<TypeParam>(expect_cxx14_apis<TypeParam>());
+}
+
+TYPED_TEST_P(ConstructorTest, CopyConstructor) {
+ using T = hash_internal::GeneratedType<TypeParam>;
+ using H = typename TypeParam::hasher;
+ using E = typename TypeParam::key_equal;
+ using A = typename TypeParam::allocator_type;
+ H hasher;
+ E equal;
+ A alloc(0);
+ TypeParam m(123, hasher, equal, alloc);
+ for (size_t i = 0; i != 10; ++i) m.insert(hash_internal::Generator<T>()());
+ TypeParam n(m);
+ EXPECT_EQ(m.hash_function(), n.hash_function());
+ EXPECT_EQ(m.key_eq(), n.key_eq());
+ EXPECT_EQ(m.get_allocator(), n.get_allocator());
+ EXPECT_EQ(m, n);
+}
+
+template <typename TypeParam>
+void CopyConstructorAllocTest(std::false_type) {}
+
+template <typename TypeParam>
+void CopyConstructorAllocTest(std::true_type) {
+ using T = hash_internal::GeneratedType<TypeParam>;
+ using H = typename TypeParam::hasher;
+ using E = typename TypeParam::key_equal;
+ using A = typename TypeParam::allocator_type;
+ H hasher;
+ E equal;
+ A alloc(0);
+ TypeParam m(123, hasher, equal, alloc);
+ for (size_t i = 0; i != 10; ++i) m.insert(hash_internal::Generator<T>()());
+ TypeParam n(m, A(11));
+ EXPECT_EQ(m.hash_function(), n.hash_function());
+ EXPECT_EQ(m.key_eq(), n.key_eq());
+ EXPECT_NE(m.get_allocator(), n.get_allocator());
+ EXPECT_EQ(m, n);
+}
+
+TYPED_TEST_P(ConstructorTest, CopyConstructorAlloc) {
+ CopyConstructorAllocTest<TypeParam>(expect_alloc_constructors<TypeParam>());
+}
+
+// TODO(alkis): Test non-propagating allocators on copy constructors.
+
+TYPED_TEST_P(ConstructorTest, MoveConstructor) {
+ using T = hash_internal::GeneratedType<TypeParam>;
+ using H = typename TypeParam::hasher;
+ using E = typename TypeParam::key_equal;
+ using A = typename TypeParam::allocator_type;
+ H hasher;
+ E equal;
+ A alloc(0);
+ TypeParam m(123, hasher, equal, alloc);
+ for (size_t i = 0; i != 10; ++i) m.insert(hash_internal::Generator<T>()());
+ TypeParam t(m);
+ TypeParam n(std::move(t));
+ EXPECT_EQ(m.hash_function(), n.hash_function());
+ EXPECT_EQ(m.key_eq(), n.key_eq());
+ EXPECT_EQ(m.get_allocator(), n.get_allocator());
+ EXPECT_EQ(m, n);
+}
+
+template <typename TypeParam>
+void MoveConstructorAllocTest(std::false_type) {}
+
+template <typename TypeParam>
+void MoveConstructorAllocTest(std::true_type) {
+ using T = hash_internal::GeneratedType<TypeParam>;
+ using H = typename TypeParam::hasher;
+ using E = typename TypeParam::key_equal;
+ using A = typename TypeParam::allocator_type;
+ H hasher;
+ E equal;
+ A alloc(0);
+ TypeParam m(123, hasher, equal, alloc);
+ for (size_t i = 0; i != 10; ++i) m.insert(hash_internal::Generator<T>()());
+ TypeParam t(m);
+ TypeParam n(std::move(t), A(1));
+ EXPECT_EQ(m.hash_function(), n.hash_function());
+ EXPECT_EQ(m.key_eq(), n.key_eq());
+ EXPECT_NE(m.get_allocator(), n.get_allocator());
+ EXPECT_EQ(m, n);
+}
+
+TYPED_TEST_P(ConstructorTest, MoveConstructorAlloc) {
+ MoveConstructorAllocTest<TypeParam>(expect_alloc_constructors<TypeParam>());
+}
+
+// TODO(alkis): Test non-propagating allocators on move constructors.
+
+TYPED_TEST_P(ConstructorTest, InitializerListBucketHashEqualAlloc) {
+ using T = hash_internal::GeneratedType<TypeParam>;
+ hash_internal::Generator<T> gen;
+ std::initializer_list<T> values = {gen(), gen(), gen(), gen(), gen()};
+ using H = typename TypeParam::hasher;
+ using E = typename TypeParam::key_equal;
+ using A = typename TypeParam::allocator_type;
+ H hasher;
+ E equal;
+ A alloc(0);
+ TypeParam m(values, 123, hasher, equal, alloc);
+ EXPECT_EQ(m.hash_function(), hasher);
+ EXPECT_EQ(m.key_eq(), equal);
+ EXPECT_EQ(m.get_allocator(), alloc);
+ EXPECT_THAT(items(m), ::testing::UnorderedElementsAreArray(values));
+ EXPECT_GE(m.bucket_count(), 123);
+}
+
+template <typename TypeParam>
+void InitializerListBucketAllocTest(std::false_type) {}
+
+template <typename TypeParam>
+void InitializerListBucketAllocTest(std::true_type) {
+ using T = hash_internal::GeneratedType<TypeParam>;
+ using A = typename TypeParam::allocator_type;
+ hash_internal::Generator<T> gen;
+ std::initializer_list<T> values = {gen(), gen(), gen(), gen(), gen()};
+ A alloc(0);
+ TypeParam m(values, 123, alloc);
+ EXPECT_EQ(m.get_allocator(), alloc);
+ EXPECT_THAT(items(m), ::testing::UnorderedElementsAreArray(values));
+ EXPECT_GE(m.bucket_count(), 123);
+}
+
+TYPED_TEST_P(ConstructorTest, InitializerListBucketAlloc) {
+ InitializerListBucketAllocTest<TypeParam>(expect_cxx14_apis<TypeParam>());
+}
+
+template <typename TypeParam>
+void InitializerListBucketHashAllocTest(std::false_type) {}
+
+template <typename TypeParam>
+void InitializerListBucketHashAllocTest(std::true_type) {
+ using T = hash_internal::GeneratedType<TypeParam>;
+ using H = typename TypeParam::hasher;
+ using A = typename TypeParam::allocator_type;
+ H hasher;
+ A alloc(0);
+ hash_internal::Generator<T> gen;
+ std::initializer_list<T> values = {gen(), gen(), gen(), gen(), gen()};
+ TypeParam m(values, 123, hasher, alloc);
+ EXPECT_EQ(m.hash_function(), hasher);
+ EXPECT_EQ(m.get_allocator(), alloc);
+ EXPECT_THAT(items(m), ::testing::UnorderedElementsAreArray(values));
+ EXPECT_GE(m.bucket_count(), 123);
+}
+
+TYPED_TEST_P(ConstructorTest, InitializerListBucketHashAlloc) {
+ InitializerListBucketHashAllocTest<TypeParam>(expect_cxx14_apis<TypeParam>());
+}
+
+TYPED_TEST_P(ConstructorTest, Assignment) {
+ using T = hash_internal::GeneratedType<TypeParam>;
+ using H = typename TypeParam::hasher;
+ using E = typename TypeParam::key_equal;
+ using A = typename TypeParam::allocator_type;
+ H hasher;
+ E equal;
+ A alloc(0);
+ hash_internal::Generator<T> gen;
+ TypeParam m({gen(), gen(), gen()}, 123, hasher, equal, alloc);
+ TypeParam n;
+ n = m;
+ EXPECT_EQ(m.hash_function(), n.hash_function());
+ EXPECT_EQ(m.key_eq(), n.key_eq());
+ EXPECT_EQ(m, n);
+}
+
+// TODO(alkis): Test [non-]propagating allocators on move/copy assignments
+// (it depends on traits).
+
+TYPED_TEST_P(ConstructorTest, MoveAssignment) {
+ using T = hash_internal::GeneratedType<TypeParam>;
+ using H = typename TypeParam::hasher;
+ using E = typename TypeParam::key_equal;
+ using A = typename TypeParam::allocator_type;
+ H hasher;
+ E equal;
+ A alloc(0);
+ hash_internal::Generator<T> gen;
+ TypeParam m({gen(), gen(), gen()}, 123, hasher, equal, alloc);
+ TypeParam t(m);
+ TypeParam n;
+ n = std::move(t);
+ EXPECT_EQ(m.hash_function(), n.hash_function());
+ EXPECT_EQ(m.key_eq(), n.key_eq());
+ EXPECT_EQ(m, n);
+}
+
+TYPED_TEST_P(ConstructorTest, AssignmentFromInitializerList) {
+ using T = hash_internal::GeneratedType<TypeParam>;
+ hash_internal::Generator<T> gen;
+ std::initializer_list<T> values = {gen(), gen(), gen(), gen(), gen()};
+ TypeParam m;
+ m = values;
+ EXPECT_THAT(items(m), ::testing::UnorderedElementsAreArray(values));
+}
+
+TYPED_TEST_P(ConstructorTest, AssignmentOverwritesExisting) {
+ using T = hash_internal::GeneratedType<TypeParam>;
+ hash_internal::Generator<T> gen;
+ TypeParam m({gen(), gen(), gen()});
+ TypeParam n({gen()});
+ n = m;
+ EXPECT_EQ(m, n);
+}
+
+TYPED_TEST_P(ConstructorTest, MoveAssignmentOverwritesExisting) {
+ using T = hash_internal::GeneratedType<TypeParam>;
+ hash_internal::Generator<T> gen;
+ TypeParam m({gen(), gen(), gen()});
+ TypeParam t(m);
+ TypeParam n({gen()});
+ n = std::move(t);
+ EXPECT_EQ(m, n);
+}
+
+TYPED_TEST_P(ConstructorTest, AssignmentFromInitializerListOverwritesExisting) {
+ using T = hash_internal::GeneratedType<TypeParam>;
+ hash_internal::Generator<T> gen;
+ std::initializer_list<T> values = {gen(), gen(), gen(), gen(), gen()};
+ TypeParam m;
+ m = values;
+ EXPECT_THAT(items(m), ::testing::UnorderedElementsAreArray(values));
+}
+
+TYPED_TEST_P(ConstructorTest, AssignmentOnSelf) {
+ using T = hash_internal::GeneratedType<TypeParam>;
+ hash_internal::Generator<T> gen;
+ std::initializer_list<T> values = {gen(), gen(), gen(), gen(), gen()};
+ TypeParam m(values);
+ m = *&m; // Avoid -Wself-assign
+ EXPECT_THAT(items(m), ::testing::UnorderedElementsAreArray(values));
+}
+
+// We cannot test self move as standard states that it leaves standard
+// containers in unspecified state (and in practice in causes memory-leak
+// according to heap-checker!).
+
+REGISTER_TYPED_TEST_CASE_P(
+ ConstructorTest, NoArgs, BucketCount, BucketCountHash, BucketCountHashEqual,
+ BucketCountHashEqualAlloc, BucketCountAlloc, BucketCountHashAlloc, Alloc,
+ InputIteratorBucketHashEqualAlloc, InputIteratorBucketAlloc,
+ InputIteratorBucketHashAlloc, CopyConstructor, CopyConstructorAlloc,
+ MoveConstructor, MoveConstructorAlloc, InitializerListBucketHashEqualAlloc,
+ InitializerListBucketAlloc, InitializerListBucketHashAlloc, Assignment,
+ MoveAssignment, AssignmentFromInitializerList, AssignmentOverwritesExisting,
+ MoveAssignmentOverwritesExisting,
+ AssignmentFromInitializerListOverwritesExisting, AssignmentOnSelf);
+
+} // namespace container_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_CONTAINER_INTERNAL_UNORDERED_MAP_CONSTRUCTOR_TEST_H_
diff --git a/third_party/abseil/src/absl/container/internal/unordered_map_lookup_test.h b/third_party/abseil/src/absl/container/internal/unordered_map_lookup_test.h
new file mode 100644
index 0000000..e76421e
--- /dev/null
+++ b/third_party/abseil/src/absl/container/internal/unordered_map_lookup_test.h
@@ -0,0 +1,117 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_CONTAINER_INTERNAL_UNORDERED_MAP_LOOKUP_TEST_H_
+#define ABSL_CONTAINER_INTERNAL_UNORDERED_MAP_LOOKUP_TEST_H_
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/container/internal/hash_generator_testing.h"
+#include "absl/container/internal/hash_policy_testing.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace container_internal {
+
+template <class UnordMap>
+class LookupTest : public ::testing::Test {};
+
+TYPED_TEST_SUITE_P(LookupTest);
+
+TYPED_TEST_P(LookupTest, At) {
+ using T = hash_internal::GeneratedType<TypeParam>;
+ std::vector<T> values;
+ std::generate_n(std::back_inserter(values), 10,
+ hash_internal::Generator<T>());
+ TypeParam m(values.begin(), values.end());
+ for (const auto& p : values) {
+ const auto& val = m.at(p.first);
+ EXPECT_EQ(p.second, val) << ::testing::PrintToString(p.first);
+ }
+}
+
+TYPED_TEST_P(LookupTest, OperatorBracket) {
+ using T = hash_internal::GeneratedType<TypeParam>;
+ using V = typename TypeParam::mapped_type;
+ std::vector<T> values;
+ std::generate_n(std::back_inserter(values), 10,
+ hash_internal::Generator<T>());
+ TypeParam m;
+ for (const auto& p : values) {
+ auto& val = m[p.first];
+ EXPECT_EQ(V(), val) << ::testing::PrintToString(p.first);
+ val = p.second;
+ }
+ for (const auto& p : values)
+ EXPECT_EQ(p.second, m[p.first]) << ::testing::PrintToString(p.first);
+}
+
+TYPED_TEST_P(LookupTest, Count) {
+ using T = hash_internal::GeneratedType<TypeParam>;
+ std::vector<T> values;
+ std::generate_n(std::back_inserter(values), 10,
+ hash_internal::Generator<T>());
+ TypeParam m;
+ for (const auto& p : values)
+ EXPECT_EQ(0, m.count(p.first)) << ::testing::PrintToString(p.first);
+ m.insert(values.begin(), values.end());
+ for (const auto& p : values)
+ EXPECT_EQ(1, m.count(p.first)) << ::testing::PrintToString(p.first);
+}
+
+TYPED_TEST_P(LookupTest, Find) {
+ using std::get;
+ using T = hash_internal::GeneratedType<TypeParam>;
+ std::vector<T> values;
+ std::generate_n(std::back_inserter(values), 10,
+ hash_internal::Generator<T>());
+ TypeParam m;
+ for (const auto& p : values)
+ EXPECT_TRUE(m.end() == m.find(p.first))
+ << ::testing::PrintToString(p.first);
+ m.insert(values.begin(), values.end());
+ for (const auto& p : values) {
+ auto it = m.find(p.first);
+ EXPECT_TRUE(m.end() != it) << ::testing::PrintToString(p.first);
+ EXPECT_EQ(p.second, get<1>(*it)) << ::testing::PrintToString(p.first);
+ }
+}
+
+TYPED_TEST_P(LookupTest, EqualRange) {
+ using std::get;
+ using T = hash_internal::GeneratedType<TypeParam>;
+ std::vector<T> values;
+ std::generate_n(std::back_inserter(values), 10,
+ hash_internal::Generator<T>());
+ TypeParam m;
+ for (const auto& p : values) {
+ auto r = m.equal_range(p.first);
+ ASSERT_EQ(0, std::distance(r.first, r.second));
+ }
+ m.insert(values.begin(), values.end());
+ for (const auto& p : values) {
+ auto r = m.equal_range(p.first);
+ ASSERT_EQ(1, std::distance(r.first, r.second));
+ EXPECT_EQ(p.second, get<1>(*r.first)) << ::testing::PrintToString(p.first);
+ }
+}
+
+REGISTER_TYPED_TEST_CASE_P(LookupTest, At, OperatorBracket, Count, Find,
+ EqualRange);
+
+} // namespace container_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_CONTAINER_INTERNAL_UNORDERED_MAP_LOOKUP_TEST_H_
diff --git a/third_party/abseil/src/absl/container/internal/unordered_map_members_test.h b/third_party/abseil/src/absl/container/internal/unordered_map_members_test.h
new file mode 100644
index 0000000..7d48cdb
--- /dev/null
+++ b/third_party/abseil/src/absl/container/internal/unordered_map_members_test.h
@@ -0,0 +1,87 @@
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_CONTAINER_INTERNAL_UNORDERED_MAP_MEMBERS_TEST_H_
+#define ABSL_CONTAINER_INTERNAL_UNORDERED_MAP_MEMBERS_TEST_H_
+
+#include <type_traits>
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/meta/type_traits.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace container_internal {
+
+template <class UnordMap>
+class MembersTest : public ::testing::Test {};
+
+TYPED_TEST_SUITE_P(MembersTest);
+
+template <typename T>
+void UseType() {}
+
+TYPED_TEST_P(MembersTest, Typedefs) {
+ EXPECT_TRUE((std::is_same<std::pair<const typename TypeParam::key_type,
+ typename TypeParam::mapped_type>,
+ typename TypeParam::value_type>()));
+ EXPECT_TRUE((absl::conjunction<
+ absl::negation<std::is_signed<typename TypeParam::size_type>>,
+ std::is_integral<typename TypeParam::size_type>>()));
+ EXPECT_TRUE((absl::conjunction<
+ std::is_signed<typename TypeParam::difference_type>,
+ std::is_integral<typename TypeParam::difference_type>>()));
+ EXPECT_TRUE((std::is_convertible<
+ decltype(std::declval<const typename TypeParam::hasher&>()(
+ std::declval<const typename TypeParam::key_type&>())),
+ size_t>()));
+ EXPECT_TRUE((std::is_convertible<
+ decltype(std::declval<const typename TypeParam::key_equal&>()(
+ std::declval<const typename TypeParam::key_type&>(),
+ std::declval<const typename TypeParam::key_type&>())),
+ bool>()));
+ EXPECT_TRUE((std::is_same<typename TypeParam::allocator_type::value_type,
+ typename TypeParam::value_type>()));
+ EXPECT_TRUE((std::is_same<typename TypeParam::value_type&,
+ typename TypeParam::reference>()));
+ EXPECT_TRUE((std::is_same<const typename TypeParam::value_type&,
+ typename TypeParam::const_reference>()));
+ EXPECT_TRUE((std::is_same<typename std::allocator_traits<
+ typename TypeParam::allocator_type>::pointer,
+ typename TypeParam::pointer>()));
+ EXPECT_TRUE(
+ (std::is_same<typename std::allocator_traits<
+ typename TypeParam::allocator_type>::const_pointer,
+ typename TypeParam::const_pointer>()));
+}
+
+TYPED_TEST_P(MembersTest, SimpleFunctions) {
+ EXPECT_GT(TypeParam().max_size(), 0);
+}
+
+TYPED_TEST_P(MembersTest, BeginEnd) {
+ TypeParam t = {typename TypeParam::value_type{}};
+ EXPECT_EQ(t.begin(), t.cbegin());
+ EXPECT_EQ(t.end(), t.cend());
+ EXPECT_NE(t.begin(), t.end());
+ EXPECT_NE(t.cbegin(), t.cend());
+}
+
+REGISTER_TYPED_TEST_SUITE_P(MembersTest, Typedefs, SimpleFunctions, BeginEnd);
+
+} // namespace container_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_CONTAINER_INTERNAL_UNORDERED_MAP_MEMBERS_TEST_H_
diff --git a/third_party/abseil/src/absl/container/internal/unordered_map_modifiers_test.h b/third_party/abseil/src/absl/container/internal/unordered_map_modifiers_test.h
new file mode 100644
index 0000000..8c9ca77
--- /dev/null
+++ b/third_party/abseil/src/absl/container/internal/unordered_map_modifiers_test.h
@@ -0,0 +1,318 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_CONTAINER_INTERNAL_UNORDERED_MAP_MODIFIERS_TEST_H_
+#define ABSL_CONTAINER_INTERNAL_UNORDERED_MAP_MODIFIERS_TEST_H_
+
+#include <memory>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/container/internal/hash_generator_testing.h"
+#include "absl/container/internal/hash_policy_testing.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace container_internal {
+
+template <class UnordMap>
+class ModifiersTest : public ::testing::Test {};
+
+TYPED_TEST_SUITE_P(ModifiersTest);
+
+TYPED_TEST_P(ModifiersTest, Clear) {
+ using T = hash_internal::GeneratedType<TypeParam>;
+ std::vector<T> values;
+ std::generate_n(std::back_inserter(values), 10,
+ hash_internal::Generator<T>());
+ TypeParam m(values.begin(), values.end());
+ ASSERT_THAT(items(m), ::testing::UnorderedElementsAreArray(values));
+ m.clear();
+ EXPECT_THAT(items(m), ::testing::UnorderedElementsAre());
+ EXPECT_TRUE(m.empty());
+}
+
+TYPED_TEST_P(ModifiersTest, Insert) {
+ using T = hash_internal::GeneratedType<TypeParam>;
+ using V = typename TypeParam::mapped_type;
+ T val = hash_internal::Generator<T>()();
+ TypeParam m;
+ auto p = m.insert(val);
+ EXPECT_TRUE(p.second);
+ EXPECT_EQ(val, *p.first);
+ T val2 = {val.first, hash_internal::Generator<V>()()};
+ p = m.insert(val2);
+ EXPECT_FALSE(p.second);
+ EXPECT_EQ(val, *p.first);
+}
+
+TYPED_TEST_P(ModifiersTest, InsertHint) {
+ using T = hash_internal::GeneratedType<TypeParam>;
+ using V = typename TypeParam::mapped_type;
+ T val = hash_internal::Generator<T>()();
+ TypeParam m;
+ auto it = m.insert(m.end(), val);
+ EXPECT_TRUE(it != m.end());
+ EXPECT_EQ(val, *it);
+ T val2 = {val.first, hash_internal::Generator<V>()()};
+ it = m.insert(it, val2);
+ EXPECT_TRUE(it != m.end());
+ EXPECT_EQ(val, *it);
+}
+
+TYPED_TEST_P(ModifiersTest, InsertRange) {
+ using T = hash_internal::GeneratedType<TypeParam>;
+ std::vector<T> values;
+ std::generate_n(std::back_inserter(values), 10,
+ hash_internal::Generator<T>());
+ TypeParam m;
+ m.insert(values.begin(), values.end());
+ ASSERT_THAT(items(m), ::testing::UnorderedElementsAreArray(values));
+}
+
+TYPED_TEST_P(ModifiersTest, InsertOrAssign) {
+#ifdef UNORDERED_MAP_CXX17
+ using std::get;
+ using K = typename TypeParam::key_type;
+ using V = typename TypeParam::mapped_type;
+ K k = hash_internal::Generator<K>()();
+ V val = hash_internal::Generator<V>()();
+ TypeParam m;
+ auto p = m.insert_or_assign(k, val);
+ EXPECT_TRUE(p.second);
+ EXPECT_EQ(k, get<0>(*p.first));
+ EXPECT_EQ(val, get<1>(*p.first));
+ V val2 = hash_internal::Generator<V>()();
+ p = m.insert_or_assign(k, val2);
+ EXPECT_FALSE(p.second);
+ EXPECT_EQ(k, get<0>(*p.first));
+ EXPECT_EQ(val2, get<1>(*p.first));
+#endif
+}
+
+TYPED_TEST_P(ModifiersTest, InsertOrAssignHint) {
+#ifdef UNORDERED_MAP_CXX17
+ using std::get;
+ using K = typename TypeParam::key_type;
+ using V = typename TypeParam::mapped_type;
+ K k = hash_internal::Generator<K>()();
+ V val = hash_internal::Generator<V>()();
+ TypeParam m;
+ auto it = m.insert_or_assign(m.end(), k, val);
+ EXPECT_TRUE(it != m.end());
+ EXPECT_EQ(k, get<0>(*it));
+ EXPECT_EQ(val, get<1>(*it));
+ V val2 = hash_internal::Generator<V>()();
+ it = m.insert_or_assign(it, k, val2);
+ EXPECT_EQ(k, get<0>(*it));
+ EXPECT_EQ(val2, get<1>(*it));
+#endif
+}
+
+TYPED_TEST_P(ModifiersTest, Emplace) {
+ using T = hash_internal::GeneratedType<TypeParam>;
+ using V = typename TypeParam::mapped_type;
+ T val = hash_internal::Generator<T>()();
+ TypeParam m;
+ // TODO(alkis): We need a way to run emplace in a more meaningful way. Perhaps
+ // with test traits/policy.
+ auto p = m.emplace(val);
+ EXPECT_TRUE(p.second);
+ EXPECT_EQ(val, *p.first);
+ T val2 = {val.first, hash_internal::Generator<V>()()};
+ p = m.emplace(val2);
+ EXPECT_FALSE(p.second);
+ EXPECT_EQ(val, *p.first);
+}
+
+TYPED_TEST_P(ModifiersTest, EmplaceHint) {
+ using T = hash_internal::GeneratedType<TypeParam>;
+ using V = typename TypeParam::mapped_type;
+ T val = hash_internal::Generator<T>()();
+ TypeParam m;
+ // TODO(alkis): We need a way to run emplace in a more meaningful way. Perhaps
+ // with test traits/policy.
+ auto it = m.emplace_hint(m.end(), val);
+ EXPECT_EQ(val, *it);
+ T val2 = {val.first, hash_internal::Generator<V>()()};
+ it = m.emplace_hint(it, val2);
+ EXPECT_EQ(val, *it);
+}
+
+TYPED_TEST_P(ModifiersTest, TryEmplace) {
+#ifdef UNORDERED_MAP_CXX17
+ using T = hash_internal::GeneratedType<TypeParam>;
+ using V = typename TypeParam::mapped_type;
+ T val = hash_internal::Generator<T>()();
+ TypeParam m;
+ // TODO(alkis): We need a way to run emplace in a more meaningful way. Perhaps
+ // with test traits/policy.
+ auto p = m.try_emplace(val.first, val.second);
+ EXPECT_TRUE(p.second);
+ EXPECT_EQ(val, *p.first);
+ T val2 = {val.first, hash_internal::Generator<V>()()};
+ p = m.try_emplace(val2.first, val2.second);
+ EXPECT_FALSE(p.second);
+ EXPECT_EQ(val, *p.first);
+#endif
+}
+
+TYPED_TEST_P(ModifiersTest, TryEmplaceHint) {
+#ifdef UNORDERED_MAP_CXX17
+ using T = hash_internal::GeneratedType<TypeParam>;
+ using V = typename TypeParam::mapped_type;
+ T val = hash_internal::Generator<T>()();
+ TypeParam m;
+ // TODO(alkis): We need a way to run emplace in a more meaningful way. Perhaps
+ // with test traits/policy.
+ auto it = m.try_emplace(m.end(), val.first, val.second);
+ EXPECT_EQ(val, *it);
+ T val2 = {val.first, hash_internal::Generator<V>()()};
+ it = m.try_emplace(it, val2.first, val2.second);
+ EXPECT_EQ(val, *it);
+#endif
+}
+
+template <class V>
+using IfNotVoid = typename std::enable_if<!std::is_void<V>::value, V>::type;
+
+// In openmap we chose not to return the iterator from erase because that's
+// more expensive. As such we adapt erase to return an iterator here.
+struct EraseFirst {
+ template <class Map>
+ auto operator()(Map* m, int) const
+ -> IfNotVoid<decltype(m->erase(m->begin()))> {
+ return m->erase(m->begin());
+ }
+ template <class Map>
+ typename Map::iterator operator()(Map* m, ...) const {
+ auto it = m->begin();
+ m->erase(it++);
+ return it;
+ }
+};
+
+TYPED_TEST_P(ModifiersTest, Erase) {
+ using T = hash_internal::GeneratedType<TypeParam>;
+ using std::get;
+ std::vector<T> values;
+ std::generate_n(std::back_inserter(values), 10,
+ hash_internal::Generator<T>());
+ TypeParam m(values.begin(), values.end());
+ ASSERT_THAT(items(m), ::testing::UnorderedElementsAreArray(values));
+ auto& first = *m.begin();
+ std::vector<T> values2;
+ for (const auto& val : values)
+ if (get<0>(val) != get<0>(first)) values2.push_back(val);
+ auto it = EraseFirst()(&m, 0);
+ ASSERT_TRUE(it != m.end());
+ EXPECT_EQ(1, std::count(values2.begin(), values2.end(), *it));
+ EXPECT_THAT(items(m), ::testing::UnorderedElementsAreArray(values2.begin(),
+ values2.end()));
+}
+
+TYPED_TEST_P(ModifiersTest, EraseRange) {
+ using T = hash_internal::GeneratedType<TypeParam>;
+ std::vector<T> values;
+ std::generate_n(std::back_inserter(values), 10,
+ hash_internal::Generator<T>());
+ TypeParam m(values.begin(), values.end());
+ ASSERT_THAT(items(m), ::testing::UnorderedElementsAreArray(values));
+ auto it = m.erase(m.begin(), m.end());
+ EXPECT_THAT(items(m), ::testing::UnorderedElementsAre());
+ EXPECT_TRUE(it == m.end());
+}
+
+TYPED_TEST_P(ModifiersTest, EraseKey) {
+ using T = hash_internal::GeneratedType<TypeParam>;
+ std::vector<T> values;
+ std::generate_n(std::back_inserter(values), 10,
+ hash_internal::Generator<T>());
+ TypeParam m(values.begin(), values.end());
+ ASSERT_THAT(items(m), ::testing::UnorderedElementsAreArray(values));
+ EXPECT_EQ(1, m.erase(values[0].first));
+ EXPECT_EQ(0, std::count(m.begin(), m.end(), values[0]));
+ EXPECT_THAT(items(m), ::testing::UnorderedElementsAreArray(values.begin() + 1,
+ values.end()));
+}
+
+TYPED_TEST_P(ModifiersTest, Swap) {
+ using T = hash_internal::GeneratedType<TypeParam>;
+ std::vector<T> v1;
+ std::vector<T> v2;
+ std::generate_n(std::back_inserter(v1), 5, hash_internal::Generator<T>());
+ std::generate_n(std::back_inserter(v2), 5, hash_internal::Generator<T>());
+ TypeParam m1(v1.begin(), v1.end());
+ TypeParam m2(v2.begin(), v2.end());
+ EXPECT_THAT(items(m1), ::testing::UnorderedElementsAreArray(v1));
+ EXPECT_THAT(items(m2), ::testing::UnorderedElementsAreArray(v2));
+ m1.swap(m2);
+ EXPECT_THAT(items(m1), ::testing::UnorderedElementsAreArray(v2));
+ EXPECT_THAT(items(m2), ::testing::UnorderedElementsAreArray(v1));
+}
+
+// TODO(alkis): Write tests for extract.
+// TODO(alkis): Write tests for merge.
+
+REGISTER_TYPED_TEST_CASE_P(ModifiersTest, Clear, Insert, InsertHint,
+ InsertRange, InsertOrAssign, InsertOrAssignHint,
+ Emplace, EmplaceHint, TryEmplace, TryEmplaceHint,
+ Erase, EraseRange, EraseKey, Swap);
+
+template <typename Type>
+struct is_unique_ptr : std::false_type {};
+
+template <typename Type>
+struct is_unique_ptr<std::unique_ptr<Type>> : std::true_type {};
+
+template <class UnordMap>
+class UniquePtrModifiersTest : public ::testing::Test {
+ protected:
+ UniquePtrModifiersTest() {
+ static_assert(is_unique_ptr<typename UnordMap::mapped_type>::value,
+ "UniquePtrModifiersTyest may only be called with a "
+ "std::unique_ptr value type.");
+ }
+};
+
+GTEST_ALLOW_UNINSTANTIATED_PARAMETERIZED_TEST(UniquePtrModifiersTest);
+
+TYPED_TEST_SUITE_P(UniquePtrModifiersTest);
+
+// Test that we do not move from rvalue arguments if an insertion does not
+// happen.
+TYPED_TEST_P(UniquePtrModifiersTest, TryEmplace) {
+#ifdef UNORDERED_MAP_CXX17
+ using T = hash_internal::GeneratedType<TypeParam>;
+ using V = typename TypeParam::mapped_type;
+ T val = hash_internal::Generator<T>()();
+ TypeParam m;
+ auto p = m.try_emplace(val.first, std::move(val.second));
+ EXPECT_TRUE(p.second);
+ // A moved from std::unique_ptr is guaranteed to be nullptr.
+ EXPECT_EQ(val.second, nullptr);
+ T val2 = {val.first, hash_internal::Generator<V>()()};
+ p = m.try_emplace(val2.first, std::move(val2.second));
+ EXPECT_FALSE(p.second);
+ EXPECT_NE(val2.second, nullptr);
+#endif
+}
+
+REGISTER_TYPED_TEST_SUITE_P(UniquePtrModifiersTest, TryEmplace);
+
+} // namespace container_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_CONTAINER_INTERNAL_UNORDERED_MAP_MODIFIERS_TEST_H_
diff --git a/third_party/abseil/src/absl/container/internal/unordered_map_test.cc b/third_party/abseil/src/absl/container/internal/unordered_map_test.cc
new file mode 100644
index 0000000..9cbf512
--- /dev/null
+++ b/third_party/abseil/src/absl/container/internal/unordered_map_test.cc
@@ -0,0 +1,50 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <memory>
+#include <unordered_map>
+
+#include "absl/container/internal/unordered_map_constructor_test.h"
+#include "absl/container/internal/unordered_map_lookup_test.h"
+#include "absl/container/internal/unordered_map_members_test.h"
+#include "absl/container/internal/unordered_map_modifiers_test.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace container_internal {
+namespace {
+
+using MapTypes = ::testing::Types<
+ std::unordered_map<int, int, StatefulTestingHash, StatefulTestingEqual,
+ Alloc<std::pair<const int, int>>>,
+ std::unordered_map<std::string, std::string, StatefulTestingHash,
+ StatefulTestingEqual,
+ Alloc<std::pair<const std::string, std::string>>>>;
+
+INSTANTIATE_TYPED_TEST_SUITE_P(UnorderedMap, ConstructorTest, MapTypes);
+INSTANTIATE_TYPED_TEST_SUITE_P(UnorderedMap, LookupTest, MapTypes);
+INSTANTIATE_TYPED_TEST_SUITE_P(UnorderedMap, MembersTest, MapTypes);
+INSTANTIATE_TYPED_TEST_SUITE_P(UnorderedMap, ModifiersTest, MapTypes);
+
+using UniquePtrMapTypes = ::testing::Types<std::unordered_map<
+ int, std::unique_ptr<int>, StatefulTestingHash, StatefulTestingEqual,
+ Alloc<std::pair<const int, std::unique_ptr<int>>>>>;
+
+INSTANTIATE_TYPED_TEST_SUITE_P(UnorderedMap, UniquePtrModifiersTest,
+ UniquePtrMapTypes);
+
+} // namespace
+} // namespace container_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/container/internal/unordered_set_constructor_test.h b/third_party/abseil/src/absl/container/internal/unordered_set_constructor_test.h
new file mode 100644
index 0000000..41165b0
--- /dev/null
+++ b/third_party/abseil/src/absl/container/internal/unordered_set_constructor_test.h
@@ -0,0 +1,496 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_CONTAINER_INTERNAL_UNORDERED_SET_CONSTRUCTOR_TEST_H_
+#define ABSL_CONTAINER_INTERNAL_UNORDERED_SET_CONSTRUCTOR_TEST_H_
+
+#include <algorithm>
+#include <unordered_set>
+#include <vector>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/container/internal/hash_generator_testing.h"
+#include "absl/container/internal/hash_policy_testing.h"
+#include "absl/meta/type_traits.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace container_internal {
+
+template <class UnordMap>
+class ConstructorTest : public ::testing::Test {};
+
+TYPED_TEST_SUITE_P(ConstructorTest);
+
+TYPED_TEST_P(ConstructorTest, NoArgs) {
+ TypeParam m;
+ EXPECT_TRUE(m.empty());
+ EXPECT_THAT(keys(m), ::testing::UnorderedElementsAre());
+}
+
+TYPED_TEST_P(ConstructorTest, BucketCount) {
+ TypeParam m(123);
+ EXPECT_TRUE(m.empty());
+ EXPECT_THAT(keys(m), ::testing::UnorderedElementsAre());
+ EXPECT_GE(m.bucket_count(), 123);
+}
+
+TYPED_TEST_P(ConstructorTest, BucketCountHash) {
+ using H = typename TypeParam::hasher;
+ H hasher;
+ TypeParam m(123, hasher);
+ EXPECT_EQ(m.hash_function(), hasher);
+ EXPECT_TRUE(m.empty());
+ EXPECT_THAT(keys(m), ::testing::UnorderedElementsAre());
+ EXPECT_GE(m.bucket_count(), 123);
+}
+
+TYPED_TEST_P(ConstructorTest, BucketCountHashEqual) {
+ using H = typename TypeParam::hasher;
+ using E = typename TypeParam::key_equal;
+ H hasher;
+ E equal;
+ TypeParam m(123, hasher, equal);
+ EXPECT_EQ(m.hash_function(), hasher);
+ EXPECT_EQ(m.key_eq(), equal);
+ EXPECT_TRUE(m.empty());
+ EXPECT_THAT(keys(m), ::testing::UnorderedElementsAre());
+ EXPECT_GE(m.bucket_count(), 123);
+}
+
+TYPED_TEST_P(ConstructorTest, BucketCountHashEqualAlloc) {
+ using H = typename TypeParam::hasher;
+ using E = typename TypeParam::key_equal;
+ using A = typename TypeParam::allocator_type;
+ H hasher;
+ E equal;
+ A alloc(0);
+ TypeParam m(123, hasher, equal, alloc);
+ EXPECT_EQ(m.hash_function(), hasher);
+ EXPECT_EQ(m.key_eq(), equal);
+ EXPECT_EQ(m.get_allocator(), alloc);
+ EXPECT_TRUE(m.empty());
+ EXPECT_THAT(keys(m), ::testing::UnorderedElementsAre());
+ EXPECT_GE(m.bucket_count(), 123);
+
+ const auto& cm = m;
+ EXPECT_EQ(cm.hash_function(), hasher);
+ EXPECT_EQ(cm.key_eq(), equal);
+ EXPECT_EQ(cm.get_allocator(), alloc);
+ EXPECT_TRUE(cm.empty());
+ EXPECT_THAT(keys(cm), ::testing::UnorderedElementsAre());
+ EXPECT_GE(cm.bucket_count(), 123);
+}
+
+template <typename T>
+struct is_std_unordered_set : std::false_type {};
+
+template <typename... T>
+struct is_std_unordered_set<std::unordered_set<T...>> : std::true_type {};
+
+#if defined(UNORDERED_SET_CXX14) || defined(UNORDERED_SET_CXX17)
+using has_cxx14_std_apis = std::true_type;
+#else
+using has_cxx14_std_apis = std::false_type;
+#endif
+
+template <typename T>
+using expect_cxx14_apis =
+ absl::disjunction<absl::negation<is_std_unordered_set<T>>,
+ has_cxx14_std_apis>;
+
+template <typename TypeParam>
+void BucketCountAllocTest(std::false_type) {}
+
+template <typename TypeParam>
+void BucketCountAllocTest(std::true_type) {
+ using A = typename TypeParam::allocator_type;
+ A alloc(0);
+ TypeParam m(123, alloc);
+ EXPECT_EQ(m.get_allocator(), alloc);
+ EXPECT_TRUE(m.empty());
+ EXPECT_THAT(keys(m), ::testing::UnorderedElementsAre());
+ EXPECT_GE(m.bucket_count(), 123);
+}
+
+TYPED_TEST_P(ConstructorTest, BucketCountAlloc) {
+ BucketCountAllocTest<TypeParam>(expect_cxx14_apis<TypeParam>());
+}
+
+template <typename TypeParam>
+void BucketCountHashAllocTest(std::false_type) {}
+
+template <typename TypeParam>
+void BucketCountHashAllocTest(std::true_type) {
+ using H = typename TypeParam::hasher;
+ using A = typename TypeParam::allocator_type;
+ H hasher;
+ A alloc(0);
+ TypeParam m(123, hasher, alloc);
+ EXPECT_EQ(m.hash_function(), hasher);
+ EXPECT_EQ(m.get_allocator(), alloc);
+ EXPECT_TRUE(m.empty());
+ EXPECT_THAT(keys(m), ::testing::UnorderedElementsAre());
+ EXPECT_GE(m.bucket_count(), 123);
+}
+
+TYPED_TEST_P(ConstructorTest, BucketCountHashAlloc) {
+ BucketCountHashAllocTest<TypeParam>(expect_cxx14_apis<TypeParam>());
+}
+
+#if ABSL_UNORDERED_SUPPORTS_ALLOC_CTORS
+using has_alloc_std_constructors = std::true_type;
+#else
+using has_alloc_std_constructors = std::false_type;
+#endif
+
+template <typename T>
+using expect_alloc_constructors =
+ absl::disjunction<absl::negation<is_std_unordered_set<T>>,
+ has_alloc_std_constructors>;
+
+template <typename TypeParam>
+void AllocTest(std::false_type) {}
+
+template <typename TypeParam>
+void AllocTest(std::true_type) {
+ using A = typename TypeParam::allocator_type;
+ A alloc(0);
+ TypeParam m(alloc);
+ EXPECT_EQ(m.get_allocator(), alloc);
+ EXPECT_TRUE(m.empty());
+ EXPECT_THAT(keys(m), ::testing::UnorderedElementsAre());
+}
+
+TYPED_TEST_P(ConstructorTest, Alloc) {
+ AllocTest<TypeParam>(expect_alloc_constructors<TypeParam>());
+}
+
+TYPED_TEST_P(ConstructorTest, InputIteratorBucketHashEqualAlloc) {
+ using T = hash_internal::GeneratedType<TypeParam>;
+ using H = typename TypeParam::hasher;
+ using E = typename TypeParam::key_equal;
+ using A = typename TypeParam::allocator_type;
+ H hasher;
+ E equal;
+ A alloc(0);
+ std::vector<T> values;
+ for (size_t i = 0; i != 10; ++i)
+ values.push_back(hash_internal::Generator<T>()());
+ TypeParam m(values.begin(), values.end(), 123, hasher, equal, alloc);
+ EXPECT_EQ(m.hash_function(), hasher);
+ EXPECT_EQ(m.key_eq(), equal);
+ EXPECT_EQ(m.get_allocator(), alloc);
+ EXPECT_THAT(keys(m), ::testing::UnorderedElementsAreArray(values));
+ EXPECT_GE(m.bucket_count(), 123);
+}
+
+template <typename TypeParam>
+void InputIteratorBucketAllocTest(std::false_type) {}
+
+template <typename TypeParam>
+void InputIteratorBucketAllocTest(std::true_type) {
+ using T = hash_internal::GeneratedType<TypeParam>;
+ using A = typename TypeParam::allocator_type;
+ A alloc(0);
+ std::vector<T> values;
+ for (size_t i = 0; i != 10; ++i)
+ values.push_back(hash_internal::Generator<T>()());
+ TypeParam m(values.begin(), values.end(), 123, alloc);
+ EXPECT_EQ(m.get_allocator(), alloc);
+ EXPECT_THAT(keys(m), ::testing::UnorderedElementsAreArray(values));
+ EXPECT_GE(m.bucket_count(), 123);
+}
+
+TYPED_TEST_P(ConstructorTest, InputIteratorBucketAlloc) {
+ InputIteratorBucketAllocTest<TypeParam>(expect_cxx14_apis<TypeParam>());
+}
+
+template <typename TypeParam>
+void InputIteratorBucketHashAllocTest(std::false_type) {}
+
+template <typename TypeParam>
+void InputIteratorBucketHashAllocTest(std::true_type) {
+ using T = hash_internal::GeneratedType<TypeParam>;
+ using H = typename TypeParam::hasher;
+ using A = typename TypeParam::allocator_type;
+ H hasher;
+ A alloc(0);
+ std::vector<T> values;
+ for (size_t i = 0; i != 10; ++i)
+ values.push_back(hash_internal::Generator<T>()());
+ TypeParam m(values.begin(), values.end(), 123, hasher, alloc);
+ EXPECT_EQ(m.hash_function(), hasher);
+ EXPECT_EQ(m.get_allocator(), alloc);
+ EXPECT_THAT(keys(m), ::testing::UnorderedElementsAreArray(values));
+ EXPECT_GE(m.bucket_count(), 123);
+}
+
+TYPED_TEST_P(ConstructorTest, InputIteratorBucketHashAlloc) {
+ InputIteratorBucketHashAllocTest<TypeParam>(expect_cxx14_apis<TypeParam>());
+}
+
+TYPED_TEST_P(ConstructorTest, CopyConstructor) {
+ using T = hash_internal::GeneratedType<TypeParam>;
+ using H = typename TypeParam::hasher;
+ using E = typename TypeParam::key_equal;
+ using A = typename TypeParam::allocator_type;
+ H hasher;
+ E equal;
+ A alloc(0);
+ TypeParam m(123, hasher, equal, alloc);
+ for (size_t i = 0; i != 10; ++i) m.insert(hash_internal::Generator<T>()());
+ TypeParam n(m);
+ EXPECT_EQ(m.hash_function(), n.hash_function());
+ EXPECT_EQ(m.key_eq(), n.key_eq());
+ EXPECT_EQ(m.get_allocator(), n.get_allocator());
+ EXPECT_EQ(m, n);
+ EXPECT_NE(TypeParam(0, hasher, equal, alloc), n);
+}
+
+template <typename TypeParam>
+void CopyConstructorAllocTest(std::false_type) {}
+
+template <typename TypeParam>
+void CopyConstructorAllocTest(std::true_type) {
+ using T = hash_internal::GeneratedType<TypeParam>;
+ using H = typename TypeParam::hasher;
+ using E = typename TypeParam::key_equal;
+ using A = typename TypeParam::allocator_type;
+ H hasher;
+ E equal;
+ A alloc(0);
+ TypeParam m(123, hasher, equal, alloc);
+ for (size_t i = 0; i != 10; ++i) m.insert(hash_internal::Generator<T>()());
+ TypeParam n(m, A(11));
+ EXPECT_EQ(m.hash_function(), n.hash_function());
+ EXPECT_EQ(m.key_eq(), n.key_eq());
+ EXPECT_NE(m.get_allocator(), n.get_allocator());
+ EXPECT_EQ(m, n);
+}
+
+TYPED_TEST_P(ConstructorTest, CopyConstructorAlloc) {
+ CopyConstructorAllocTest<TypeParam>(expect_alloc_constructors<TypeParam>());
+}
+
+// TODO(alkis): Test non-propagating allocators on copy constructors.
+
+TYPED_TEST_P(ConstructorTest, MoveConstructor) {
+ using T = hash_internal::GeneratedType<TypeParam>;
+ using H = typename TypeParam::hasher;
+ using E = typename TypeParam::key_equal;
+ using A = typename TypeParam::allocator_type;
+ H hasher;
+ E equal;
+ A alloc(0);
+ TypeParam m(123, hasher, equal, alloc);
+ for (size_t i = 0; i != 10; ++i) m.insert(hash_internal::Generator<T>()());
+ TypeParam t(m);
+ TypeParam n(std::move(t));
+ EXPECT_EQ(m.hash_function(), n.hash_function());
+ EXPECT_EQ(m.key_eq(), n.key_eq());
+ EXPECT_EQ(m.get_allocator(), n.get_allocator());
+ EXPECT_EQ(m, n);
+}
+
+template <typename TypeParam>
+void MoveConstructorAllocTest(std::false_type) {}
+
+template <typename TypeParam>
+void MoveConstructorAllocTest(std::true_type) {
+ using T = hash_internal::GeneratedType<TypeParam>;
+ using H = typename TypeParam::hasher;
+ using E = typename TypeParam::key_equal;
+ using A = typename TypeParam::allocator_type;
+ H hasher;
+ E equal;
+ A alloc(0);
+ TypeParam m(123, hasher, equal, alloc);
+ for (size_t i = 0; i != 10; ++i) m.insert(hash_internal::Generator<T>()());
+ TypeParam t(m);
+ TypeParam n(std::move(t), A(1));
+ EXPECT_EQ(m.hash_function(), n.hash_function());
+ EXPECT_EQ(m.key_eq(), n.key_eq());
+ EXPECT_NE(m.get_allocator(), n.get_allocator());
+ EXPECT_EQ(m, n);
+}
+
+TYPED_TEST_P(ConstructorTest, MoveConstructorAlloc) {
+ MoveConstructorAllocTest<TypeParam>(expect_alloc_constructors<TypeParam>());
+}
+
+// TODO(alkis): Test non-propagating allocators on move constructors.
+
+TYPED_TEST_P(ConstructorTest, InitializerListBucketHashEqualAlloc) {
+ using T = hash_internal::GeneratedType<TypeParam>;
+ hash_internal::Generator<T> gen;
+ std::initializer_list<T> values = {gen(), gen(), gen(), gen(), gen()};
+ using H = typename TypeParam::hasher;
+ using E = typename TypeParam::key_equal;
+ using A = typename TypeParam::allocator_type;
+ H hasher;
+ E equal;
+ A alloc(0);
+ TypeParam m(values, 123, hasher, equal, alloc);
+ EXPECT_EQ(m.hash_function(), hasher);
+ EXPECT_EQ(m.key_eq(), equal);
+ EXPECT_EQ(m.get_allocator(), alloc);
+ EXPECT_THAT(keys(m), ::testing::UnorderedElementsAreArray(values));
+ EXPECT_GE(m.bucket_count(), 123);
+}
+
+template <typename TypeParam>
+void InitializerListBucketAllocTest(std::false_type) {}
+
+template <typename TypeParam>
+void InitializerListBucketAllocTest(std::true_type) {
+ using T = hash_internal::GeneratedType<TypeParam>;
+ using A = typename TypeParam::allocator_type;
+ hash_internal::Generator<T> gen;
+ std::initializer_list<T> values = {gen(), gen(), gen(), gen(), gen()};
+ A alloc(0);
+ TypeParam m(values, 123, alloc);
+ EXPECT_EQ(m.get_allocator(), alloc);
+ EXPECT_THAT(keys(m), ::testing::UnorderedElementsAreArray(values));
+ EXPECT_GE(m.bucket_count(), 123);
+}
+
+TYPED_TEST_P(ConstructorTest, InitializerListBucketAlloc) {
+ InitializerListBucketAllocTest<TypeParam>(expect_cxx14_apis<TypeParam>());
+}
+
+template <typename TypeParam>
+void InitializerListBucketHashAllocTest(std::false_type) {}
+
+template <typename TypeParam>
+void InitializerListBucketHashAllocTest(std::true_type) {
+ using T = hash_internal::GeneratedType<TypeParam>;
+ using H = typename TypeParam::hasher;
+ using A = typename TypeParam::allocator_type;
+ H hasher;
+ A alloc(0);
+ hash_internal::Generator<T> gen;
+ std::initializer_list<T> values = {gen(), gen(), gen(), gen(), gen()};
+ TypeParam m(values, 123, hasher, alloc);
+ EXPECT_EQ(m.hash_function(), hasher);
+ EXPECT_EQ(m.get_allocator(), alloc);
+ EXPECT_THAT(keys(m), ::testing::UnorderedElementsAreArray(values));
+ EXPECT_GE(m.bucket_count(), 123);
+}
+
+TYPED_TEST_P(ConstructorTest, InitializerListBucketHashAlloc) {
+ InitializerListBucketHashAllocTest<TypeParam>(expect_cxx14_apis<TypeParam>());
+}
+
+TYPED_TEST_P(ConstructorTest, CopyAssignment) {
+ using T = hash_internal::GeneratedType<TypeParam>;
+ using H = typename TypeParam::hasher;
+ using E = typename TypeParam::key_equal;
+ using A = typename TypeParam::allocator_type;
+ H hasher;
+ E equal;
+ A alloc(0);
+ hash_internal::Generator<T> gen;
+ TypeParam m({gen(), gen(), gen()}, 123, hasher, equal, alloc);
+ TypeParam n;
+ n = m;
+ EXPECT_EQ(m.hash_function(), n.hash_function());
+ EXPECT_EQ(m.key_eq(), n.key_eq());
+ EXPECT_EQ(m, n);
+}
+
+// TODO(alkis): Test [non-]propagating allocators on move/copy assignments
+// (it depends on traits).
+
+TYPED_TEST_P(ConstructorTest, MoveAssignment) {
+ using T = hash_internal::GeneratedType<TypeParam>;
+ using H = typename TypeParam::hasher;
+ using E = typename TypeParam::key_equal;
+ using A = typename TypeParam::allocator_type;
+ H hasher;
+ E equal;
+ A alloc(0);
+ hash_internal::Generator<T> gen;
+ TypeParam m({gen(), gen(), gen()}, 123, hasher, equal, alloc);
+ TypeParam t(m);
+ TypeParam n;
+ n = std::move(t);
+ EXPECT_EQ(m.hash_function(), n.hash_function());
+ EXPECT_EQ(m.key_eq(), n.key_eq());
+ EXPECT_EQ(m, n);
+}
+
+TYPED_TEST_P(ConstructorTest, AssignmentFromInitializerList) {
+ using T = hash_internal::GeneratedType<TypeParam>;
+ hash_internal::Generator<T> gen;
+ std::initializer_list<T> values = {gen(), gen(), gen(), gen(), gen()};
+ TypeParam m;
+ m = values;
+ EXPECT_THAT(keys(m), ::testing::UnorderedElementsAreArray(values));
+}
+
+TYPED_TEST_P(ConstructorTest, AssignmentOverwritesExisting) {
+ using T = hash_internal::GeneratedType<TypeParam>;
+ hash_internal::Generator<T> gen;
+ TypeParam m({gen(), gen(), gen()});
+ TypeParam n({gen()});
+ n = m;
+ EXPECT_EQ(m, n);
+}
+
+TYPED_TEST_P(ConstructorTest, MoveAssignmentOverwritesExisting) {
+ using T = hash_internal::GeneratedType<TypeParam>;
+ hash_internal::Generator<T> gen;
+ TypeParam m({gen(), gen(), gen()});
+ TypeParam t(m);
+ TypeParam n({gen()});
+ n = std::move(t);
+ EXPECT_EQ(m, n);
+}
+
+TYPED_TEST_P(ConstructorTest, AssignmentFromInitializerListOverwritesExisting) {
+ using T = hash_internal::GeneratedType<TypeParam>;
+ hash_internal::Generator<T> gen;
+ std::initializer_list<T> values = {gen(), gen(), gen(), gen(), gen()};
+ TypeParam m;
+ m = values;
+ EXPECT_THAT(keys(m), ::testing::UnorderedElementsAreArray(values));
+}
+
+TYPED_TEST_P(ConstructorTest, AssignmentOnSelf) {
+ using T = hash_internal::GeneratedType<TypeParam>;
+ hash_internal::Generator<T> gen;
+ std::initializer_list<T> values = {gen(), gen(), gen(), gen(), gen()};
+ TypeParam m(values);
+ m = *&m; // Avoid -Wself-assign.
+ EXPECT_THAT(keys(m), ::testing::UnorderedElementsAreArray(values));
+}
+
+REGISTER_TYPED_TEST_CASE_P(
+ ConstructorTest, NoArgs, BucketCount, BucketCountHash, BucketCountHashEqual,
+ BucketCountHashEqualAlloc, BucketCountAlloc, BucketCountHashAlloc, Alloc,
+ InputIteratorBucketHashEqualAlloc, InputIteratorBucketAlloc,
+ InputIteratorBucketHashAlloc, CopyConstructor, CopyConstructorAlloc,
+ MoveConstructor, MoveConstructorAlloc, InitializerListBucketHashEqualAlloc,
+ InitializerListBucketAlloc, InitializerListBucketHashAlloc, CopyAssignment,
+ MoveAssignment, AssignmentFromInitializerList, AssignmentOverwritesExisting,
+ MoveAssignmentOverwritesExisting,
+ AssignmentFromInitializerListOverwritesExisting, AssignmentOnSelf);
+
+} // namespace container_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_CONTAINER_INTERNAL_UNORDERED_SET_CONSTRUCTOR_TEST_H_
diff --git a/third_party/abseil/src/absl/container/internal/unordered_set_lookup_test.h b/third_party/abseil/src/absl/container/internal/unordered_set_lookup_test.h
new file mode 100644
index 0000000..8f2f4b2
--- /dev/null
+++ b/third_party/abseil/src/absl/container/internal/unordered_set_lookup_test.h
@@ -0,0 +1,91 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_CONTAINER_INTERNAL_UNORDERED_SET_LOOKUP_TEST_H_
+#define ABSL_CONTAINER_INTERNAL_UNORDERED_SET_LOOKUP_TEST_H_
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/container/internal/hash_generator_testing.h"
+#include "absl/container/internal/hash_policy_testing.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace container_internal {
+
+template <class UnordSet>
+class LookupTest : public ::testing::Test {};
+
+TYPED_TEST_SUITE_P(LookupTest);
+
+TYPED_TEST_P(LookupTest, Count) {
+ using T = hash_internal::GeneratedType<TypeParam>;
+ std::vector<T> values;
+ std::generate_n(std::back_inserter(values), 10,
+ hash_internal::Generator<T>());
+ TypeParam m;
+ for (const auto& v : values)
+ EXPECT_EQ(0, m.count(v)) << ::testing::PrintToString(v);
+ m.insert(values.begin(), values.end());
+ for (const auto& v : values)
+ EXPECT_EQ(1, m.count(v)) << ::testing::PrintToString(v);
+}
+
+TYPED_TEST_P(LookupTest, Find) {
+ using T = hash_internal::GeneratedType<TypeParam>;
+ std::vector<T> values;
+ std::generate_n(std::back_inserter(values), 10,
+ hash_internal::Generator<T>());
+ TypeParam m;
+ for (const auto& v : values)
+ EXPECT_TRUE(m.end() == m.find(v)) << ::testing::PrintToString(v);
+ m.insert(values.begin(), values.end());
+ for (const auto& v : values) {
+ typename TypeParam::iterator it = m.find(v);
+ static_assert(std::is_same<const typename TypeParam::value_type&,
+ decltype(*it)>::value,
+ "");
+ static_assert(std::is_same<const typename TypeParam::value_type*,
+ decltype(it.operator->())>::value,
+ "");
+ EXPECT_TRUE(m.end() != it) << ::testing::PrintToString(v);
+ EXPECT_EQ(v, *it) << ::testing::PrintToString(v);
+ }
+}
+
+TYPED_TEST_P(LookupTest, EqualRange) {
+ using T = hash_internal::GeneratedType<TypeParam>;
+ std::vector<T> values;
+ std::generate_n(std::back_inserter(values), 10,
+ hash_internal::Generator<T>());
+ TypeParam m;
+ for (const auto& v : values) {
+ auto r = m.equal_range(v);
+ ASSERT_EQ(0, std::distance(r.first, r.second));
+ }
+ m.insert(values.begin(), values.end());
+ for (const auto& v : values) {
+ auto r = m.equal_range(v);
+ ASSERT_EQ(1, std::distance(r.first, r.second));
+ EXPECT_EQ(v, *r.first);
+ }
+}
+
+REGISTER_TYPED_TEST_CASE_P(LookupTest, Count, Find, EqualRange);
+
+} // namespace container_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_CONTAINER_INTERNAL_UNORDERED_SET_LOOKUP_TEST_H_
diff --git a/third_party/abseil/src/absl/container/internal/unordered_set_members_test.h b/third_party/abseil/src/absl/container/internal/unordered_set_members_test.h
new file mode 100644
index 0000000..4c5e104
--- /dev/null
+++ b/third_party/abseil/src/absl/container/internal/unordered_set_members_test.h
@@ -0,0 +1,86 @@
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_CONTAINER_INTERNAL_UNORDERED_SET_MEMBERS_TEST_H_
+#define ABSL_CONTAINER_INTERNAL_UNORDERED_SET_MEMBERS_TEST_H_
+
+#include <type_traits>
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/meta/type_traits.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace container_internal {
+
+template <class UnordSet>
+class MembersTest : public ::testing::Test {};
+
+TYPED_TEST_SUITE_P(MembersTest);
+
+template <typename T>
+void UseType() {}
+
+TYPED_TEST_P(MembersTest, Typedefs) {
+ EXPECT_TRUE((std::is_same<typename TypeParam::key_type,
+ typename TypeParam::value_type>()));
+ EXPECT_TRUE((absl::conjunction<
+ absl::negation<std::is_signed<typename TypeParam::size_type>>,
+ std::is_integral<typename TypeParam::size_type>>()));
+ EXPECT_TRUE((absl::conjunction<
+ std::is_signed<typename TypeParam::difference_type>,
+ std::is_integral<typename TypeParam::difference_type>>()));
+ EXPECT_TRUE((std::is_convertible<
+ decltype(std::declval<const typename TypeParam::hasher&>()(
+ std::declval<const typename TypeParam::key_type&>())),
+ size_t>()));
+ EXPECT_TRUE((std::is_convertible<
+ decltype(std::declval<const typename TypeParam::key_equal&>()(
+ std::declval<const typename TypeParam::key_type&>(),
+ std::declval<const typename TypeParam::key_type&>())),
+ bool>()));
+ EXPECT_TRUE((std::is_same<typename TypeParam::allocator_type::value_type,
+ typename TypeParam::value_type>()));
+ EXPECT_TRUE((std::is_same<typename TypeParam::value_type&,
+ typename TypeParam::reference>()));
+ EXPECT_TRUE((std::is_same<const typename TypeParam::value_type&,
+ typename TypeParam::const_reference>()));
+ EXPECT_TRUE((std::is_same<typename std::allocator_traits<
+ typename TypeParam::allocator_type>::pointer,
+ typename TypeParam::pointer>()));
+ EXPECT_TRUE(
+ (std::is_same<typename std::allocator_traits<
+ typename TypeParam::allocator_type>::const_pointer,
+ typename TypeParam::const_pointer>()));
+}
+
+TYPED_TEST_P(MembersTest, SimpleFunctions) {
+ EXPECT_GT(TypeParam().max_size(), 0);
+}
+
+TYPED_TEST_P(MembersTest, BeginEnd) {
+ TypeParam t = {typename TypeParam::value_type{}};
+ EXPECT_EQ(t.begin(), t.cbegin());
+ EXPECT_EQ(t.end(), t.cend());
+ EXPECT_NE(t.begin(), t.end());
+ EXPECT_NE(t.cbegin(), t.cend());
+}
+
+REGISTER_TYPED_TEST_SUITE_P(MembersTest, Typedefs, SimpleFunctions, BeginEnd);
+
+} // namespace container_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_CONTAINER_INTERNAL_UNORDERED_SET_MEMBERS_TEST_H_
diff --git a/third_party/abseil/src/absl/container/internal/unordered_set_modifiers_test.h b/third_party/abseil/src/absl/container/internal/unordered_set_modifiers_test.h
new file mode 100644
index 0000000..26be58d
--- /dev/null
+++ b/third_party/abseil/src/absl/container/internal/unordered_set_modifiers_test.h
@@ -0,0 +1,190 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_CONTAINER_INTERNAL_UNORDERED_SET_MODIFIERS_TEST_H_
+#define ABSL_CONTAINER_INTERNAL_UNORDERED_SET_MODIFIERS_TEST_H_
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/container/internal/hash_generator_testing.h"
+#include "absl/container/internal/hash_policy_testing.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace container_internal {
+
+template <class UnordSet>
+class ModifiersTest : public ::testing::Test {};
+
+TYPED_TEST_SUITE_P(ModifiersTest);
+
+TYPED_TEST_P(ModifiersTest, Clear) {
+ using T = hash_internal::GeneratedType<TypeParam>;
+ std::vector<T> values;
+ std::generate_n(std::back_inserter(values), 10,
+ hash_internal::Generator<T>());
+ TypeParam m(values.begin(), values.end());
+ ASSERT_THAT(keys(m), ::testing::UnorderedElementsAreArray(values));
+ m.clear();
+ EXPECT_THAT(keys(m), ::testing::UnorderedElementsAre());
+ EXPECT_TRUE(m.empty());
+}
+
+TYPED_TEST_P(ModifiersTest, Insert) {
+ using T = hash_internal::GeneratedType<TypeParam>;
+ T val = hash_internal::Generator<T>()();
+ TypeParam m;
+ auto p = m.insert(val);
+ EXPECT_TRUE(p.second);
+ EXPECT_EQ(val, *p.first);
+ p = m.insert(val);
+ EXPECT_FALSE(p.second);
+}
+
+TYPED_TEST_P(ModifiersTest, InsertHint) {
+ using T = hash_internal::GeneratedType<TypeParam>;
+ T val = hash_internal::Generator<T>()();
+ TypeParam m;
+ auto it = m.insert(m.end(), val);
+ EXPECT_TRUE(it != m.end());
+ EXPECT_EQ(val, *it);
+ it = m.insert(it, val);
+ EXPECT_TRUE(it != m.end());
+ EXPECT_EQ(val, *it);
+}
+
+TYPED_TEST_P(ModifiersTest, InsertRange) {
+ using T = hash_internal::GeneratedType<TypeParam>;
+ std::vector<T> values;
+ std::generate_n(std::back_inserter(values), 10,
+ hash_internal::Generator<T>());
+ TypeParam m;
+ m.insert(values.begin(), values.end());
+ ASSERT_THAT(keys(m), ::testing::UnorderedElementsAreArray(values));
+}
+
+TYPED_TEST_P(ModifiersTest, Emplace) {
+ using T = hash_internal::GeneratedType<TypeParam>;
+ T val = hash_internal::Generator<T>()();
+ TypeParam m;
+ // TODO(alkis): We need a way to run emplace in a more meaningful way. Perhaps
+ // with test traits/policy.
+ auto p = m.emplace(val);
+ EXPECT_TRUE(p.second);
+ EXPECT_EQ(val, *p.first);
+ p = m.emplace(val);
+ EXPECT_FALSE(p.second);
+ EXPECT_EQ(val, *p.first);
+}
+
+TYPED_TEST_P(ModifiersTest, EmplaceHint) {
+ using T = hash_internal::GeneratedType<TypeParam>;
+ T val = hash_internal::Generator<T>()();
+ TypeParam m;
+ // TODO(alkis): We need a way to run emplace in a more meaningful way. Perhaps
+ // with test traits/policy.
+ auto it = m.emplace_hint(m.end(), val);
+ EXPECT_EQ(val, *it);
+ it = m.emplace_hint(it, val);
+ EXPECT_EQ(val, *it);
+}
+
+template <class V>
+using IfNotVoid = typename std::enable_if<!std::is_void<V>::value, V>::type;
+
+// In openmap we chose not to return the iterator from erase because that's
+// more expensive. As such we adapt erase to return an iterator here.
+struct EraseFirst {
+ template <class Map>
+ auto operator()(Map* m, int) const
+ -> IfNotVoid<decltype(m->erase(m->begin()))> {
+ return m->erase(m->begin());
+ }
+ template <class Map>
+ typename Map::iterator operator()(Map* m, ...) const {
+ auto it = m->begin();
+ m->erase(it++);
+ return it;
+ }
+};
+
+TYPED_TEST_P(ModifiersTest, Erase) {
+ using T = hash_internal::GeneratedType<TypeParam>;
+ std::vector<T> values;
+ std::generate_n(std::back_inserter(values), 10,
+ hash_internal::Generator<T>());
+ TypeParam m(values.begin(), values.end());
+ ASSERT_THAT(keys(m), ::testing::UnorderedElementsAreArray(values));
+ std::vector<T> values2;
+ for (const auto& val : values)
+ if (val != *m.begin()) values2.push_back(val);
+ auto it = EraseFirst()(&m, 0);
+ ASSERT_TRUE(it != m.end());
+ EXPECT_EQ(1, std::count(values2.begin(), values2.end(), *it));
+ EXPECT_THAT(keys(m), ::testing::UnorderedElementsAreArray(values2.begin(),
+ values2.end()));
+}
+
+TYPED_TEST_P(ModifiersTest, EraseRange) {
+ using T = hash_internal::GeneratedType<TypeParam>;
+ std::vector<T> values;
+ std::generate_n(std::back_inserter(values), 10,
+ hash_internal::Generator<T>());
+ TypeParam m(values.begin(), values.end());
+ ASSERT_THAT(keys(m), ::testing::UnorderedElementsAreArray(values));
+ auto it = m.erase(m.begin(), m.end());
+ EXPECT_THAT(keys(m), ::testing::UnorderedElementsAre());
+ EXPECT_TRUE(it == m.end());
+}
+
+TYPED_TEST_P(ModifiersTest, EraseKey) {
+ using T = hash_internal::GeneratedType<TypeParam>;
+ std::vector<T> values;
+ std::generate_n(std::back_inserter(values), 10,
+ hash_internal::Generator<T>());
+ TypeParam m(values.begin(), values.end());
+ ASSERT_THAT(keys(m), ::testing::UnorderedElementsAreArray(values));
+ EXPECT_EQ(1, m.erase(values[0]));
+ EXPECT_EQ(0, std::count(m.begin(), m.end(), values[0]));
+ EXPECT_THAT(keys(m), ::testing::UnorderedElementsAreArray(values.begin() + 1,
+ values.end()));
+}
+
+TYPED_TEST_P(ModifiersTest, Swap) {
+ using T = hash_internal::GeneratedType<TypeParam>;
+ std::vector<T> v1;
+ std::vector<T> v2;
+ std::generate_n(std::back_inserter(v1), 5, hash_internal::Generator<T>());
+ std::generate_n(std::back_inserter(v2), 5, hash_internal::Generator<T>());
+ TypeParam m1(v1.begin(), v1.end());
+ TypeParam m2(v2.begin(), v2.end());
+ EXPECT_THAT(keys(m1), ::testing::UnorderedElementsAreArray(v1));
+ EXPECT_THAT(keys(m2), ::testing::UnorderedElementsAreArray(v2));
+ m1.swap(m2);
+ EXPECT_THAT(keys(m1), ::testing::UnorderedElementsAreArray(v2));
+ EXPECT_THAT(keys(m2), ::testing::UnorderedElementsAreArray(v1));
+}
+
+// TODO(alkis): Write tests for extract.
+// TODO(alkis): Write tests for merge.
+
+REGISTER_TYPED_TEST_CASE_P(ModifiersTest, Clear, Insert, InsertHint,
+ InsertRange, Emplace, EmplaceHint, Erase, EraseRange,
+ EraseKey, Swap);
+
+} // namespace container_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_CONTAINER_INTERNAL_UNORDERED_SET_MODIFIERS_TEST_H_
diff --git a/third_party/abseil/src/absl/container/internal/unordered_set_test.cc b/third_party/abseil/src/absl/container/internal/unordered_set_test.cc
new file mode 100644
index 0000000..a134b53
--- /dev/null
+++ b/third_party/abseil/src/absl/container/internal/unordered_set_test.cc
@@ -0,0 +1,41 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <unordered_set>
+
+#include "absl/container/internal/unordered_set_constructor_test.h"
+#include "absl/container/internal/unordered_set_lookup_test.h"
+#include "absl/container/internal/unordered_set_members_test.h"
+#include "absl/container/internal/unordered_set_modifiers_test.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace container_internal {
+namespace {
+
+using SetTypes = ::testing::Types<
+ std::unordered_set<int, StatefulTestingHash, StatefulTestingEqual,
+ Alloc<int>>,
+ std::unordered_set<std::string, StatefulTestingHash, StatefulTestingEqual,
+ Alloc<std::string>>>;
+
+INSTANTIATE_TYPED_TEST_SUITE_P(UnorderedSet, ConstructorTest, SetTypes);
+INSTANTIATE_TYPED_TEST_SUITE_P(UnorderedSet, LookupTest, SetTypes);
+INSTANTIATE_TYPED_TEST_SUITE_P(UnorderedSet, MembersTest, SetTypes);
+INSTANTIATE_TYPED_TEST_SUITE_P(UnorderedSet, ModifiersTest, SetTypes);
+
+} // namespace
+} // namespace container_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/container/node_hash_map.h b/third_party/abseil/src/absl/container/node_hash_map.h
new file mode 100644
index 0000000..7a39f62
--- /dev/null
+++ b/third_party/abseil/src/absl/container/node_hash_map.h
@@ -0,0 +1,597 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: node_hash_map.h
+// -----------------------------------------------------------------------------
+//
+// An `absl::node_hash_map<K, V>` is an unordered associative container of
+// unique keys and associated values designed to be a more efficient replacement
+// for `std::unordered_map`. Like `unordered_map`, search, insertion, and
+// deletion of map elements can be done as an `O(1)` operation. However,
+// `node_hash_map` (and other unordered associative containers known as the
+// collection of Abseil "Swiss tables") contain other optimizations that result
+// in both memory and computation advantages.
+//
+// In most cases, your default choice for a hash map should be a map of type
+// `flat_hash_map`. However, if you need pointer stability and cannot store
+// a `flat_hash_map` with `unique_ptr` elements, a `node_hash_map` may be a
+// valid alternative. As well, if you are migrating your code from using
+// `std::unordered_map`, a `node_hash_map` provides a more straightforward
+// migration, because it guarantees pointer stability. Consider migrating to
+// `node_hash_map` and perhaps converting to a more efficient `flat_hash_map`
+// upon further review.
+
+#ifndef ABSL_CONTAINER_NODE_HASH_MAP_H_
+#define ABSL_CONTAINER_NODE_HASH_MAP_H_
+
+#include <tuple>
+#include <type_traits>
+#include <utility>
+
+#include "absl/algorithm/container.h"
+#include "absl/container/internal/container_memory.h"
+#include "absl/container/internal/hash_function_defaults.h" // IWYU pragma: export
+#include "absl/container/internal/node_hash_policy.h"
+#include "absl/container/internal/raw_hash_map.h" // IWYU pragma: export
+#include "absl/memory/memory.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace container_internal {
+template <class Key, class Value>
+class NodeHashMapPolicy;
+} // namespace container_internal
+
+// -----------------------------------------------------------------------------
+// absl::node_hash_map
+// -----------------------------------------------------------------------------
+//
+// An `absl::node_hash_map<K, V>` is an unordered associative container which
+// has been optimized for both speed and memory footprint in most common use
+// cases. Its interface is similar to that of `std::unordered_map<K, V>` with
+// the following notable differences:
+//
+// * Supports heterogeneous lookup, through `find()`, `operator[]()` and
+// `insert()`, provided that the map is provided a compatible heterogeneous
+// hashing function and equality operator.
+// * Contains a `capacity()` member function indicating the number of element
+// slots (open, deleted, and empty) within the hash map.
+// * Returns `void` from the `erase(iterator)` overload.
+//
+// By default, `node_hash_map` uses the `absl::Hash` hashing framework.
+// All fundamental and Abseil types that support the `absl::Hash` framework have
+// a compatible equality operator for comparing insertions into `node_hash_map`.
+// If your type is not yet supported by the `absl::Hash` framework, see
+// absl/hash/hash.h for information on extending Abseil hashing to user-defined
+// types.
+//
+// Example:
+//
+// // Create a node hash map of three strings (that map to strings)
+// absl::node_hash_map<std::string, std::string> ducks =
+// {{"a", "huey"}, {"b", "dewey"}, {"c", "louie"}};
+//
+// // Insert a new element into the node hash map
+// ducks.insert({"d", "donald"}};
+//
+// // Force a rehash of the node hash map
+// ducks.rehash(0);
+//
+// // Find the element with the key "b"
+// std::string search_key = "b";
+// auto result = ducks.find(search_key);
+// if (result != ducks.end()) {
+// std::cout << "Result: " << result->second << std::endl;
+// }
+template <class Key, class Value,
+ class Hash = absl::container_internal::hash_default_hash<Key>,
+ class Eq = absl::container_internal::hash_default_eq<Key>,
+ class Alloc = std::allocator<std::pair<const Key, Value>>>
+class node_hash_map
+ : public absl::container_internal::raw_hash_map<
+ absl::container_internal::NodeHashMapPolicy<Key, Value>, Hash, Eq,
+ Alloc> {
+ using Base = typename node_hash_map::raw_hash_map;
+
+ public:
+ // Constructors and Assignment Operators
+ //
+ // A node_hash_map supports the same overload set as `std::unordered_map`
+ // for construction and assignment:
+ //
+ // * Default constructor
+ //
+ // // No allocation for the table's elements is made.
+ // absl::node_hash_map<int, std::string> map1;
+ //
+ // * Initializer List constructor
+ //
+ // absl::node_hash_map<int, std::string> map2 =
+ // {{1, "huey"}, {2, "dewey"}, {3, "louie"},};
+ //
+ // * Copy constructor
+ //
+ // absl::node_hash_map<int, std::string> map3(map2);
+ //
+ // * Copy assignment operator
+ //
+ // // Hash functor and Comparator are copied as well
+ // absl::node_hash_map<int, std::string> map4;
+ // map4 = map3;
+ //
+ // * Move constructor
+ //
+ // // Move is guaranteed efficient
+ // absl::node_hash_map<int, std::string> map5(std::move(map4));
+ //
+ // * Move assignment operator
+ //
+ // // May be efficient if allocators are compatible
+ // absl::node_hash_map<int, std::string> map6;
+ // map6 = std::move(map5);
+ //
+ // * Range constructor
+ //
+ // std::vector<std::pair<int, std::string>> v = {{1, "a"}, {2, "b"}};
+ // absl::node_hash_map<int, std::string> map7(v.begin(), v.end());
+ node_hash_map() {}
+ using Base::Base;
+
+ // node_hash_map::begin()
+ //
+ // Returns an iterator to the beginning of the `node_hash_map`.
+ using Base::begin;
+
+ // node_hash_map::cbegin()
+ //
+ // Returns a const iterator to the beginning of the `node_hash_map`.
+ using Base::cbegin;
+
+ // node_hash_map::cend()
+ //
+ // Returns a const iterator to the end of the `node_hash_map`.
+ using Base::cend;
+
+ // node_hash_map::end()
+ //
+ // Returns an iterator to the end of the `node_hash_map`.
+ using Base::end;
+
+ // node_hash_map::capacity()
+ //
+ // Returns the number of element slots (assigned, deleted, and empty)
+ // available within the `node_hash_map`.
+ //
+ // NOTE: this member function is particular to `absl::node_hash_map` and is
+ // not provided in the `std::unordered_map` API.
+ using Base::capacity;
+
+ // node_hash_map::empty()
+ //
+ // Returns whether or not the `node_hash_map` is empty.
+ using Base::empty;
+
+ // node_hash_map::max_size()
+ //
+ // Returns the largest theoretical possible number of elements within a
+ // `node_hash_map` under current memory constraints. This value can be thought
+ // of as the largest value of `std::distance(begin(), end())` for a
+ // `node_hash_map<K, V>`.
+ using Base::max_size;
+
+ // node_hash_map::size()
+ //
+ // Returns the number of elements currently within the `node_hash_map`.
+ using Base::size;
+
+ // node_hash_map::clear()
+ //
+ // Removes all elements from the `node_hash_map`. Invalidates any references,
+ // pointers, or iterators referring to contained elements.
+ //
+ // NOTE: this operation may shrink the underlying buffer. To avoid shrinking
+ // the underlying buffer call `erase(begin(), end())`.
+ using Base::clear;
+
+ // node_hash_map::erase()
+ //
+ // Erases elements within the `node_hash_map`. Erasing does not trigger a
+ // rehash. Overloads are listed below.
+ //
+ // void erase(const_iterator pos):
+ //
+ // Erases the element at `position` of the `node_hash_map`, returning
+ // `void`.
+ //
+ // NOTE: this return behavior is different than that of STL containers in
+ // general and `std::unordered_map` in particular.
+ //
+ // iterator erase(const_iterator first, const_iterator last):
+ //
+ // Erases the elements in the open interval [`first`, `last`), returning an
+ // iterator pointing to `last`.
+ //
+ // size_type erase(const key_type& key):
+ //
+ // Erases the element with the matching key, if it exists, returning the
+ // number of elements erased (0 or 1).
+ using Base::erase;
+
+ // node_hash_map::insert()
+ //
+ // Inserts an element of the specified value into the `node_hash_map`,
+ // returning an iterator pointing to the newly inserted element, provided that
+ // an element with the given key does not already exist. If rehashing occurs
+ // due to the insertion, all iterators are invalidated. Overloads are listed
+ // below.
+ //
+ // std::pair<iterator,bool> insert(const init_type& value):
+ //
+ // Inserts a value into the `node_hash_map`. Returns a pair consisting of an
+ // iterator to the inserted element (or to the element that prevented the
+ // insertion) and a `bool` denoting whether the insertion took place.
+ //
+ // std::pair<iterator,bool> insert(T&& value):
+ // std::pair<iterator,bool> insert(init_type&& value):
+ //
+ // Inserts a moveable value into the `node_hash_map`. Returns a `std::pair`
+ // consisting of an iterator to the inserted element (or to the element that
+ // prevented the insertion) and a `bool` denoting whether the insertion took
+ // place.
+ //
+ // iterator insert(const_iterator hint, const init_type& value):
+ // iterator insert(const_iterator hint, T&& value):
+ // iterator insert(const_iterator hint, init_type&& value);
+ //
+ // Inserts a value, using the position of `hint` as a non-binding suggestion
+ // for where to begin the insertion search. Returns an iterator to the
+ // inserted element, or to the existing element that prevented the
+ // insertion.
+ //
+ // void insert(InputIterator first, InputIterator last):
+ //
+ // Inserts a range of values [`first`, `last`).
+ //
+ // NOTE: Although the STL does not specify which element may be inserted if
+ // multiple keys compare equivalently, for `node_hash_map` we guarantee the
+ // first match is inserted.
+ //
+ // void insert(std::initializer_list<init_type> ilist):
+ //
+ // Inserts the elements within the initializer list `ilist`.
+ //
+ // NOTE: Although the STL does not specify which element may be inserted if
+ // multiple keys compare equivalently within the initializer list, for
+ // `node_hash_map` we guarantee the first match is inserted.
+ using Base::insert;
+
+ // node_hash_map::insert_or_assign()
+ //
+ // Inserts an element of the specified value into the `node_hash_map` provided
+ // that a value with the given key does not already exist, or replaces it with
+ // the element value if a key for that value already exists, returning an
+ // iterator pointing to the newly inserted element. If rehashing occurs due to
+ // the insertion, all iterators are invalidated. Overloads are listed
+ // below.
+ //
+ // std::pair<iterator, bool> insert_or_assign(const init_type& k, T&& obj):
+ // std::pair<iterator, bool> insert_or_assign(init_type&& k, T&& obj):
+ //
+ // Inserts/Assigns (or moves) the element of the specified key into the
+ // `node_hash_map`.
+ //
+ // iterator insert_or_assign(const_iterator hint,
+ // const init_type& k, T&& obj):
+ // iterator insert_or_assign(const_iterator hint, init_type&& k, T&& obj):
+ //
+ // Inserts/Assigns (or moves) the element of the specified key into the
+ // `node_hash_map` using the position of `hint` as a non-binding suggestion
+ // for where to begin the insertion search.
+ using Base::insert_or_assign;
+
+ // node_hash_map::emplace()
+ //
+ // Inserts an element of the specified value by constructing it in-place
+ // within the `node_hash_map`, provided that no element with the given key
+ // already exists.
+ //
+ // The element may be constructed even if there already is an element with the
+ // key in the container, in which case the newly constructed element will be
+ // destroyed immediately. Prefer `try_emplace()` unless your key is not
+ // copyable or moveable.
+ //
+ // If rehashing occurs due to the insertion, all iterators are invalidated.
+ using Base::emplace;
+
+ // node_hash_map::emplace_hint()
+ //
+ // Inserts an element of the specified value by constructing it in-place
+ // within the `node_hash_map`, using the position of `hint` as a non-binding
+ // suggestion for where to begin the insertion search, and only inserts
+ // provided that no element with the given key already exists.
+ //
+ // The element may be constructed even if there already is an element with the
+ // key in the container, in which case the newly constructed element will be
+ // destroyed immediately. Prefer `try_emplace()` unless your key is not
+ // copyable or moveable.
+ //
+ // If rehashing occurs due to the insertion, all iterators are invalidated.
+ using Base::emplace_hint;
+
+ // node_hash_map::try_emplace()
+ //
+ // Inserts an element of the specified value by constructing it in-place
+ // within the `node_hash_map`, provided that no element with the given key
+ // already exists. Unlike `emplace()`, if an element with the given key
+ // already exists, we guarantee that no element is constructed.
+ //
+ // If rehashing occurs due to the insertion, all iterators are invalidated.
+ // Overloads are listed below.
+ //
+ // std::pair<iterator, bool> try_emplace(const key_type& k, Args&&... args):
+ // std::pair<iterator, bool> try_emplace(key_type&& k, Args&&... args):
+ //
+ // Inserts (via copy or move) the element of the specified key into the
+ // `node_hash_map`.
+ //
+ // iterator try_emplace(const_iterator hint,
+ // const init_type& k, Args&&... args):
+ // iterator try_emplace(const_iterator hint, init_type&& k, Args&&... args):
+ //
+ // Inserts (via copy or move) the element of the specified key into the
+ // `node_hash_map` using the position of `hint` as a non-binding suggestion
+ // for where to begin the insertion search.
+ //
+ // All `try_emplace()` overloads make the same guarantees regarding rvalue
+ // arguments as `std::unordered_map::try_emplace()`, namely that these
+ // functions will not move from rvalue arguments if insertions do not happen.
+ using Base::try_emplace;
+
+ // node_hash_map::extract()
+ //
+ // Extracts the indicated element, erasing it in the process, and returns it
+ // as a C++17-compatible node handle. Overloads are listed below.
+ //
+ // node_type extract(const_iterator position):
+ //
+ // Extracts the key,value pair of the element at the indicated position and
+ // returns a node handle owning that extracted data.
+ //
+ // node_type extract(const key_type& x):
+ //
+ // Extracts the key,value pair of the element with a key matching the passed
+ // key value and returns a node handle owning that extracted data. If the
+ // `node_hash_map` does not contain an element with a matching key, this
+ // function returns an empty node handle.
+ //
+ // NOTE: when compiled in an earlier version of C++ than C++17,
+ // `node_type::key()` returns a const reference to the key instead of a
+ // mutable reference. We cannot safely return a mutable reference without
+ // std::launder (which is not available before C++17).
+ using Base::extract;
+
+ // node_hash_map::merge()
+ //
+ // Extracts elements from a given `source` node hash map into this
+ // `node_hash_map`. If the destination `node_hash_map` already contains an
+ // element with an equivalent key, that element is not extracted.
+ using Base::merge;
+
+ // node_hash_map::swap(node_hash_map& other)
+ //
+ // Exchanges the contents of this `node_hash_map` with those of the `other`
+ // node hash map, avoiding invocation of any move, copy, or swap operations on
+ // individual elements.
+ //
+ // All iterators and references on the `node_hash_map` remain valid, excepting
+ // for the past-the-end iterator, which is invalidated.
+ //
+ // `swap()` requires that the node hash map's hashing and key equivalence
+ // functions be Swappable, and are exchaged using unqualified calls to
+ // non-member `swap()`. If the map's allocator has
+ // `std::allocator_traits<allocator_type>::propagate_on_container_swap::value`
+ // set to `true`, the allocators are also exchanged using an unqualified call
+ // to non-member `swap()`; otherwise, the allocators are not swapped.
+ using Base::swap;
+
+ // node_hash_map::rehash(count)
+ //
+ // Rehashes the `node_hash_map`, setting the number of slots to be at least
+ // the passed value. If the new number of slots increases the load factor more
+ // than the current maximum load factor
+ // (`count` < `size()` / `max_load_factor()`), then the new number of slots
+ // will be at least `size()` / `max_load_factor()`.
+ //
+ // To force a rehash, pass rehash(0).
+ using Base::rehash;
+
+ // node_hash_map::reserve(count)
+ //
+ // Sets the number of slots in the `node_hash_map` to the number needed to
+ // accommodate at least `count` total elements without exceeding the current
+ // maximum load factor, and may rehash the container if needed.
+ using Base::reserve;
+
+ // node_hash_map::at()
+ //
+ // Returns a reference to the mapped value of the element with key equivalent
+ // to the passed key.
+ using Base::at;
+
+ // node_hash_map::contains()
+ //
+ // Determines whether an element with a key comparing equal to the given `key`
+ // exists within the `node_hash_map`, returning `true` if so or `false`
+ // otherwise.
+ using Base::contains;
+
+ // node_hash_map::count(const Key& key) const
+ //
+ // Returns the number of elements with a key comparing equal to the given
+ // `key` within the `node_hash_map`. note that this function will return
+ // either `1` or `0` since duplicate keys are not allowed within a
+ // `node_hash_map`.
+ using Base::count;
+
+ // node_hash_map::equal_range()
+ //
+ // Returns a closed range [first, last], defined by a `std::pair` of two
+ // iterators, containing all elements with the passed key in the
+ // `node_hash_map`.
+ using Base::equal_range;
+
+ // node_hash_map::find()
+ //
+ // Finds an element with the passed `key` within the `node_hash_map`.
+ using Base::find;
+
+ // node_hash_map::operator[]()
+ //
+ // Returns a reference to the value mapped to the passed key within the
+ // `node_hash_map`, performing an `insert()` if the key does not already
+ // exist. If an insertion occurs and results in a rehashing of the container,
+ // all iterators are invalidated. Otherwise iterators are not affected and
+ // references are not invalidated. Overloads are listed below.
+ //
+ // T& operator[](const Key& key):
+ //
+ // Inserts an init_type object constructed in-place if the element with the
+ // given key does not exist.
+ //
+ // T& operator[](Key&& key):
+ //
+ // Inserts an init_type object constructed in-place provided that an element
+ // with the given key does not exist.
+ using Base::operator[];
+
+ // node_hash_map::bucket_count()
+ //
+ // Returns the number of "buckets" within the `node_hash_map`.
+ using Base::bucket_count;
+
+ // node_hash_map::load_factor()
+ //
+ // Returns the current load factor of the `node_hash_map` (the average number
+ // of slots occupied with a value within the hash map).
+ using Base::load_factor;
+
+ // node_hash_map::max_load_factor()
+ //
+ // Manages the maximum load factor of the `node_hash_map`. Overloads are
+ // listed below.
+ //
+ // float node_hash_map::max_load_factor()
+ //
+ // Returns the current maximum load factor of the `node_hash_map`.
+ //
+ // void node_hash_map::max_load_factor(float ml)
+ //
+ // Sets the maximum load factor of the `node_hash_map` to the passed value.
+ //
+ // NOTE: This overload is provided only for API compatibility with the STL;
+ // `node_hash_map` will ignore any set load factor and manage its rehashing
+ // internally as an implementation detail.
+ using Base::max_load_factor;
+
+ // node_hash_map::get_allocator()
+ //
+ // Returns the allocator function associated with this `node_hash_map`.
+ using Base::get_allocator;
+
+ // node_hash_map::hash_function()
+ //
+ // Returns the hashing function used to hash the keys within this
+ // `node_hash_map`.
+ using Base::hash_function;
+
+ // node_hash_map::key_eq()
+ //
+ // Returns the function used for comparing keys equality.
+ using Base::key_eq;
+};
+
+// erase_if(node_hash_map<>, Pred)
+//
+// Erases all elements that satisfy the predicate `pred` from the container `c`.
+template <typename K, typename V, typename H, typename E, typename A,
+ typename Predicate>
+void erase_if(node_hash_map<K, V, H, E, A>& c, Predicate pred) {
+ container_internal::EraseIf(pred, &c);
+}
+
+namespace container_internal {
+
+template <class Key, class Value>
+class NodeHashMapPolicy
+ : public absl::container_internal::node_hash_policy<
+ std::pair<const Key, Value>&, NodeHashMapPolicy<Key, Value>> {
+ using value_type = std::pair<const Key, Value>;
+
+ public:
+ using key_type = Key;
+ using mapped_type = Value;
+ using init_type = std::pair</*non const*/ key_type, mapped_type>;
+
+ template <class Allocator, class... Args>
+ static value_type* new_element(Allocator* alloc, Args&&... args) {
+ using PairAlloc = typename absl::allocator_traits<
+ Allocator>::template rebind_alloc<value_type>;
+ PairAlloc pair_alloc(*alloc);
+ value_type* res =
+ absl::allocator_traits<PairAlloc>::allocate(pair_alloc, 1);
+ absl::allocator_traits<PairAlloc>::construct(pair_alloc, res,
+ std::forward<Args>(args)...);
+ return res;
+ }
+
+ template <class Allocator>
+ static void delete_element(Allocator* alloc, value_type* pair) {
+ using PairAlloc = typename absl::allocator_traits<
+ Allocator>::template rebind_alloc<value_type>;
+ PairAlloc pair_alloc(*alloc);
+ absl::allocator_traits<PairAlloc>::destroy(pair_alloc, pair);
+ absl::allocator_traits<PairAlloc>::deallocate(pair_alloc, pair, 1);
+ }
+
+ template <class F, class... Args>
+ static decltype(absl::container_internal::DecomposePair(
+ std::declval<F>(), std::declval<Args>()...))
+ apply(F&& f, Args&&... args) {
+ return absl::container_internal::DecomposePair(std::forward<F>(f),
+ std::forward<Args>(args)...);
+ }
+
+ static size_t element_space_used(const value_type*) {
+ return sizeof(value_type);
+ }
+
+ static Value& value(value_type* elem) { return elem->second; }
+ static const Value& value(const value_type* elem) { return elem->second; }
+};
+} // namespace container_internal
+
+namespace container_algorithm_internal {
+
+// Specialization of trait in absl/algorithm/container.h
+template <class Key, class T, class Hash, class KeyEqual, class Allocator>
+struct IsUnorderedContainer<
+ absl::node_hash_map<Key, T, Hash, KeyEqual, Allocator>> : std::true_type {};
+
+} // namespace container_algorithm_internal
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_CONTAINER_NODE_HASH_MAP_H_
diff --git a/third_party/abseil/src/absl/container/node_hash_map_test.cc b/third_party/abseil/src/absl/container/node_hash_map_test.cc
new file mode 100644
index 0000000..8f59a1e
--- /dev/null
+++ b/third_party/abseil/src/absl/container/node_hash_map_test.cc
@@ -0,0 +1,275 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/container/node_hash_map.h"
+
+#include "absl/container/internal/tracked.h"
+#include "absl/container/internal/unordered_map_constructor_test.h"
+#include "absl/container/internal/unordered_map_lookup_test.h"
+#include "absl/container/internal/unordered_map_members_test.h"
+#include "absl/container/internal/unordered_map_modifiers_test.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace container_internal {
+namespace {
+
+using ::testing::Field;
+using ::testing::IsEmpty;
+using ::testing::Pair;
+using ::testing::UnorderedElementsAre;
+
+using MapTypes = ::testing::Types<
+ absl::node_hash_map<int, int, StatefulTestingHash, StatefulTestingEqual,
+ Alloc<std::pair<const int, int>>>,
+ absl::node_hash_map<std::string, std::string, StatefulTestingHash,
+ StatefulTestingEqual,
+ Alloc<std::pair<const std::string, std::string>>>>;
+
+INSTANTIATE_TYPED_TEST_SUITE_P(NodeHashMap, ConstructorTest, MapTypes);
+INSTANTIATE_TYPED_TEST_SUITE_P(NodeHashMap, LookupTest, MapTypes);
+INSTANTIATE_TYPED_TEST_SUITE_P(NodeHashMap, MembersTest, MapTypes);
+INSTANTIATE_TYPED_TEST_SUITE_P(NodeHashMap, ModifiersTest, MapTypes);
+
+using M = absl::node_hash_map<std::string, Tracked<int>>;
+
+TEST(NodeHashMap, Emplace) {
+ M m;
+ Tracked<int> t(53);
+ m.emplace("a", t);
+ ASSERT_EQ(0, t.num_moves());
+ ASSERT_EQ(1, t.num_copies());
+
+ m.emplace(std::string("a"), t);
+ ASSERT_EQ(0, t.num_moves());
+ ASSERT_EQ(1, t.num_copies());
+
+ std::string a("a");
+ m.emplace(a, t);
+ ASSERT_EQ(0, t.num_moves());
+ ASSERT_EQ(1, t.num_copies());
+
+ const std::string ca("a");
+ m.emplace(a, t);
+ ASSERT_EQ(0, t.num_moves());
+ ASSERT_EQ(1, t.num_copies());
+
+ m.emplace(std::make_pair("a", t));
+ ASSERT_EQ(0, t.num_moves());
+ ASSERT_EQ(2, t.num_copies());
+
+ m.emplace(std::make_pair(std::string("a"), t));
+ ASSERT_EQ(0, t.num_moves());
+ ASSERT_EQ(3, t.num_copies());
+
+ std::pair<std::string, Tracked<int>> p("a", t);
+ ASSERT_EQ(0, t.num_moves());
+ ASSERT_EQ(4, t.num_copies());
+ m.emplace(p);
+ ASSERT_EQ(0, t.num_moves());
+ ASSERT_EQ(4, t.num_copies());
+
+ const std::pair<std::string, Tracked<int>> cp("a", t);
+ ASSERT_EQ(0, t.num_moves());
+ ASSERT_EQ(5, t.num_copies());
+ m.emplace(cp);
+ ASSERT_EQ(0, t.num_moves());
+ ASSERT_EQ(5, t.num_copies());
+
+ std::pair<const std::string, Tracked<int>> pc("a", t);
+ ASSERT_EQ(0, t.num_moves());
+ ASSERT_EQ(6, t.num_copies());
+ m.emplace(pc);
+ ASSERT_EQ(0, t.num_moves());
+ ASSERT_EQ(6, t.num_copies());
+
+ const std::pair<const std::string, Tracked<int>> cpc("a", t);
+ ASSERT_EQ(0, t.num_moves());
+ ASSERT_EQ(7, t.num_copies());
+ m.emplace(cpc);
+ ASSERT_EQ(0, t.num_moves());
+ ASSERT_EQ(7, t.num_copies());
+
+ m.emplace(std::piecewise_construct, std::forward_as_tuple("a"),
+ std::forward_as_tuple(t));
+ ASSERT_EQ(0, t.num_moves());
+ ASSERT_EQ(7, t.num_copies());
+
+ m.emplace(std::piecewise_construct, std::forward_as_tuple(std::string("a")),
+ std::forward_as_tuple(t));
+ ASSERT_EQ(0, t.num_moves());
+ ASSERT_EQ(7, t.num_copies());
+}
+
+TEST(NodeHashMap, AssignRecursive) {
+ struct Tree {
+ // Verify that unordered_map<K, IncompleteType> can be instantiated.
+ absl::node_hash_map<int, Tree> children;
+ };
+ Tree root;
+ const Tree& child = root.children.emplace().first->second;
+ // Verify that `lhs = rhs` doesn't read rhs after clearing lhs.
+ root = child;
+}
+
+TEST(FlatHashMap, MoveOnlyKey) {
+ struct Key {
+ Key() = default;
+ Key(Key&&) = default;
+ Key& operator=(Key&&) = default;
+ };
+ struct Eq {
+ bool operator()(const Key&, const Key&) const { return true; }
+ };
+ struct Hash {
+ size_t operator()(const Key&) const { return 0; }
+ };
+ absl::node_hash_map<Key, int, Hash, Eq> m;
+ m[Key()];
+}
+
+struct NonMovableKey {
+ explicit NonMovableKey(int i) : i(i) {}
+ NonMovableKey(NonMovableKey&&) = delete;
+ int i;
+};
+struct NonMovableKeyHash {
+ using is_transparent = void;
+ size_t operator()(const NonMovableKey& k) const { return k.i; }
+ size_t operator()(int k) const { return k; }
+};
+struct NonMovableKeyEq {
+ using is_transparent = void;
+ bool operator()(const NonMovableKey& a, const NonMovableKey& b) const {
+ return a.i == b.i;
+ }
+ bool operator()(const NonMovableKey& a, int b) const { return a.i == b; }
+};
+
+TEST(NodeHashMap, MergeExtractInsert) {
+ absl::node_hash_map<NonMovableKey, int, NonMovableKeyHash, NonMovableKeyEq>
+ set1, set2;
+ set1.emplace(std::piecewise_construct, std::make_tuple(7),
+ std::make_tuple(-7));
+ set1.emplace(std::piecewise_construct, std::make_tuple(17),
+ std::make_tuple(-17));
+
+ set2.emplace(std::piecewise_construct, std::make_tuple(7),
+ std::make_tuple(-70));
+ set2.emplace(std::piecewise_construct, std::make_tuple(19),
+ std::make_tuple(-190));
+
+ auto Elem = [](int key, int value) {
+ return Pair(Field(&NonMovableKey::i, key), value);
+ };
+
+ EXPECT_THAT(set1, UnorderedElementsAre(Elem(7, -7), Elem(17, -17)));
+ EXPECT_THAT(set2, UnorderedElementsAre(Elem(7, -70), Elem(19, -190)));
+
+ // NonMovableKey is neither copyable nor movable. We should still be able to
+ // move nodes around.
+ static_assert(!std::is_move_constructible<NonMovableKey>::value, "");
+ set1.merge(set2);
+
+ EXPECT_THAT(set1,
+ UnorderedElementsAre(Elem(7, -7), Elem(17, -17), Elem(19, -190)));
+ EXPECT_THAT(set2, UnorderedElementsAre(Elem(7, -70)));
+
+ auto node = set1.extract(7);
+ EXPECT_TRUE(node);
+ EXPECT_EQ(node.key().i, 7);
+ EXPECT_EQ(node.mapped(), -7);
+ EXPECT_THAT(set1, UnorderedElementsAre(Elem(17, -17), Elem(19, -190)));
+
+ auto insert_result = set2.insert(std::move(node));
+ EXPECT_FALSE(node);
+ EXPECT_FALSE(insert_result.inserted);
+ EXPECT_TRUE(insert_result.node);
+ EXPECT_EQ(insert_result.node.key().i, 7);
+ EXPECT_EQ(insert_result.node.mapped(), -7);
+ EXPECT_THAT(*insert_result.position, Elem(7, -70));
+ EXPECT_THAT(set2, UnorderedElementsAre(Elem(7, -70)));
+
+ node = set1.extract(17);
+ EXPECT_TRUE(node);
+ EXPECT_EQ(node.key().i, 17);
+ EXPECT_EQ(node.mapped(), -17);
+ EXPECT_THAT(set1, UnorderedElementsAre(Elem(19, -190)));
+
+ node.mapped() = 23;
+
+ insert_result = set2.insert(std::move(node));
+ EXPECT_FALSE(node);
+ EXPECT_TRUE(insert_result.inserted);
+ EXPECT_FALSE(insert_result.node);
+ EXPECT_THAT(*insert_result.position, Elem(17, 23));
+ EXPECT_THAT(set2, UnorderedElementsAre(Elem(7, -70), Elem(17, 23)));
+}
+
+bool FirstIsEven(std::pair<const int, int> p) { return p.first % 2 == 0; }
+
+TEST(NodeHashMap, EraseIf) {
+ // Erase all elements.
+ {
+ node_hash_map<int, int> s = {{1, 1}, {2, 2}, {3, 3}, {4, 4}, {5, 5}};
+ erase_if(s, [](std::pair<const int, int>) { return true; });
+ EXPECT_THAT(s, IsEmpty());
+ }
+ // Erase no elements.
+ {
+ node_hash_map<int, int> s = {{1, 1}, {2, 2}, {3, 3}, {4, 4}, {5, 5}};
+ erase_if(s, [](std::pair<const int, int>) { return false; });
+ EXPECT_THAT(s, UnorderedElementsAre(Pair(1, 1), Pair(2, 2), Pair(3, 3),
+ Pair(4, 4), Pair(5, 5)));
+ }
+ // Erase specific elements.
+ {
+ node_hash_map<int, int> s = {{1, 1}, {2, 2}, {3, 3}, {4, 4}, {5, 5}};
+ erase_if(s,
+ [](std::pair<const int, int> kvp) { return kvp.first % 2 == 1; });
+ EXPECT_THAT(s, UnorderedElementsAre(Pair(2, 2), Pair(4, 4)));
+ }
+ // Predicate is function reference.
+ {
+ node_hash_map<int, int> s = {{1, 1}, {2, 2}, {3, 3}, {4, 4}, {5, 5}};
+ erase_if(s, FirstIsEven);
+ EXPECT_THAT(s, UnorderedElementsAre(Pair(1, 1), Pair(3, 3), Pair(5, 5)));
+ }
+ // Predicate is function pointer.
+ {
+ node_hash_map<int, int> s = {{1, 1}, {2, 2}, {3, 3}, {4, 4}, {5, 5}};
+ erase_if(s, &FirstIsEven);
+ EXPECT_THAT(s, UnorderedElementsAre(Pair(1, 1), Pair(3, 3), Pair(5, 5)));
+ }
+}
+
+// This test requires std::launder for mutable key access in node handles.
+#if defined(__cpp_lib_launder) && __cpp_lib_launder >= 201606
+TEST(NodeHashMap, NodeHandleMutableKeyAccess) {
+ node_hash_map<std::string, std::string> map;
+
+ map["key1"] = "mapped";
+
+ auto nh = map.extract(map.begin());
+ nh.key().resize(3);
+ map.insert(std::move(nh));
+
+ EXPECT_THAT(map, testing::ElementsAre(Pair("key", "mapped")));
+}
+#endif
+
+} // namespace
+} // namespace container_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/container/node_hash_set.h b/third_party/abseil/src/absl/container/node_hash_set.h
new file mode 100644
index 0000000..56ce3b6
--- /dev/null
+++ b/third_party/abseil/src/absl/container/node_hash_set.h
@@ -0,0 +1,493 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: node_hash_set.h
+// -----------------------------------------------------------------------------
+//
+// An `absl::node_hash_set<T>` is an unordered associative container designed to
+// be a more efficient replacement for `std::unordered_set`. Like
+// `unordered_set`, search, insertion, and deletion of map elements can be done
+// as an `O(1)` operation. However, `node_hash_set` (and other unordered
+// associative containers known as the collection of Abseil "Swiss tables")
+// contain other optimizations that result in both memory and computation
+// advantages.
+//
+// In most cases, your default choice for a hash table should be a map of type
+// `flat_hash_map` or a set of type `flat_hash_set`. However, if you need
+// pointer stability, a `node_hash_set` should be your preferred choice. As
+// well, if you are migrating your code from using `std::unordered_set`, a
+// `node_hash_set` should be an easy migration. Consider migrating to
+// `node_hash_set` and perhaps converting to a more efficient `flat_hash_set`
+// upon further review.
+
+#ifndef ABSL_CONTAINER_NODE_HASH_SET_H_
+#define ABSL_CONTAINER_NODE_HASH_SET_H_
+
+#include <type_traits>
+
+#include "absl/algorithm/container.h"
+#include "absl/container/internal/hash_function_defaults.h" // IWYU pragma: export
+#include "absl/container/internal/node_hash_policy.h"
+#include "absl/container/internal/raw_hash_set.h" // IWYU pragma: export
+#include "absl/memory/memory.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace container_internal {
+template <typename T>
+struct NodeHashSetPolicy;
+} // namespace container_internal
+
+// -----------------------------------------------------------------------------
+// absl::node_hash_set
+// -----------------------------------------------------------------------------
+//
+// An `absl::node_hash_set<T>` is an unordered associative container which
+// has been optimized for both speed and memory footprint in most common use
+// cases. Its interface is similar to that of `std::unordered_set<T>` with the
+// following notable differences:
+//
+// * Supports heterogeneous lookup, through `find()`, `operator[]()` and
+// `insert()`, provided that the map is provided a compatible heterogeneous
+// hashing function and equality operator.
+// * Contains a `capacity()` member function indicating the number of element
+// slots (open, deleted, and empty) within the hash set.
+// * Returns `void` from the `erase(iterator)` overload.
+//
+// By default, `node_hash_set` uses the `absl::Hash` hashing framework.
+// All fundamental and Abseil types that support the `absl::Hash` framework have
+// a compatible equality operator for comparing insertions into `node_hash_set`.
+// If your type is not yet supported by the `absl::Hash` framework, see
+// absl/hash/hash.h for information on extending Abseil hashing to user-defined
+// types.
+//
+// Example:
+//
+// // Create a node hash set of three strings
+// absl::node_hash_map<std::string, std::string> ducks =
+// {"huey", "dewey", "louie"};
+//
+// // Insert a new element into the node hash map
+// ducks.insert("donald"};
+//
+// // Force a rehash of the node hash map
+// ducks.rehash(0);
+//
+// // See if "dewey" is present
+// if (ducks.contains("dewey")) {
+// std::cout << "We found dewey!" << std::endl;
+// }
+template <class T, class Hash = absl::container_internal::hash_default_hash<T>,
+ class Eq = absl::container_internal::hash_default_eq<T>,
+ class Alloc = std::allocator<T>>
+class node_hash_set
+ : public absl::container_internal::raw_hash_set<
+ absl::container_internal::NodeHashSetPolicy<T>, Hash, Eq, Alloc> {
+ using Base = typename node_hash_set::raw_hash_set;
+
+ public:
+ // Constructors and Assignment Operators
+ //
+ // A node_hash_set supports the same overload set as `std::unordered_map`
+ // for construction and assignment:
+ //
+ // * Default constructor
+ //
+ // // No allocation for the table's elements is made.
+ // absl::node_hash_set<std::string> set1;
+ //
+ // * Initializer List constructor
+ //
+ // absl::node_hash_set<std::string> set2 =
+ // {{"huey"}, {"dewey"}, {"louie"}};
+ //
+ // * Copy constructor
+ //
+ // absl::node_hash_set<std::string> set3(set2);
+ //
+ // * Copy assignment operator
+ //
+ // // Hash functor and Comparator are copied as well
+ // absl::node_hash_set<std::string> set4;
+ // set4 = set3;
+ //
+ // * Move constructor
+ //
+ // // Move is guaranteed efficient
+ // absl::node_hash_set<std::string> set5(std::move(set4));
+ //
+ // * Move assignment operator
+ //
+ // // May be efficient if allocators are compatible
+ // absl::node_hash_set<std::string> set6;
+ // set6 = std::move(set5);
+ //
+ // * Range constructor
+ //
+ // std::vector<std::string> v = {"a", "b"};
+ // absl::node_hash_set<std::string> set7(v.begin(), v.end());
+ node_hash_set() {}
+ using Base::Base;
+
+ // node_hash_set::begin()
+ //
+ // Returns an iterator to the beginning of the `node_hash_set`.
+ using Base::begin;
+
+ // node_hash_set::cbegin()
+ //
+ // Returns a const iterator to the beginning of the `node_hash_set`.
+ using Base::cbegin;
+
+ // node_hash_set::cend()
+ //
+ // Returns a const iterator to the end of the `node_hash_set`.
+ using Base::cend;
+
+ // node_hash_set::end()
+ //
+ // Returns an iterator to the end of the `node_hash_set`.
+ using Base::end;
+
+ // node_hash_set::capacity()
+ //
+ // Returns the number of element slots (assigned, deleted, and empty)
+ // available within the `node_hash_set`.
+ //
+ // NOTE: this member function is particular to `absl::node_hash_set` and is
+ // not provided in the `std::unordered_map` API.
+ using Base::capacity;
+
+ // node_hash_set::empty()
+ //
+ // Returns whether or not the `node_hash_set` is empty.
+ using Base::empty;
+
+ // node_hash_set::max_size()
+ //
+ // Returns the largest theoretical possible number of elements within a
+ // `node_hash_set` under current memory constraints. This value can be thought
+ // of the largest value of `std::distance(begin(), end())` for a
+ // `node_hash_set<T>`.
+ using Base::max_size;
+
+ // node_hash_set::size()
+ //
+ // Returns the number of elements currently within the `node_hash_set`.
+ using Base::size;
+
+ // node_hash_set::clear()
+ //
+ // Removes all elements from the `node_hash_set`. Invalidates any references,
+ // pointers, or iterators referring to contained elements.
+ //
+ // NOTE: this operation may shrink the underlying buffer. To avoid shrinking
+ // the underlying buffer call `erase(begin(), end())`.
+ using Base::clear;
+
+ // node_hash_set::erase()
+ //
+ // Erases elements within the `node_hash_set`. Erasing does not trigger a
+ // rehash. Overloads are listed below.
+ //
+ // void erase(const_iterator pos):
+ //
+ // Erases the element at `position` of the `node_hash_set`, returning
+ // `void`.
+ //
+ // NOTE: this return behavior is different than that of STL containers in
+ // general and `std::unordered_map` in particular.
+ //
+ // iterator erase(const_iterator first, const_iterator last):
+ //
+ // Erases the elements in the open interval [`first`, `last`), returning an
+ // iterator pointing to `last`.
+ //
+ // size_type erase(const key_type& key):
+ //
+ // Erases the element with the matching key, if it exists, returning the
+ // number of elements erased (0 or 1).
+ using Base::erase;
+
+ // node_hash_set::insert()
+ //
+ // Inserts an element of the specified value into the `node_hash_set`,
+ // returning an iterator pointing to the newly inserted element, provided that
+ // an element with the given key does not already exist. If rehashing occurs
+ // due to the insertion, all iterators are invalidated. Overloads are listed
+ // below.
+ //
+ // std::pair<iterator,bool> insert(const T& value):
+ //
+ // Inserts a value into the `node_hash_set`. Returns a pair consisting of an
+ // iterator to the inserted element (or to the element that prevented the
+ // insertion) and a bool denoting whether the insertion took place.
+ //
+ // std::pair<iterator,bool> insert(T&& value):
+ //
+ // Inserts a moveable value into the `node_hash_set`. Returns a pair
+ // consisting of an iterator to the inserted element (or to the element that
+ // prevented the insertion) and a bool denoting whether the insertion took
+ // place.
+ //
+ // iterator insert(const_iterator hint, const T& value):
+ // iterator insert(const_iterator hint, T&& value):
+ //
+ // Inserts a value, using the position of `hint` as a non-binding suggestion
+ // for where to begin the insertion search. Returns an iterator to the
+ // inserted element, or to the existing element that prevented the
+ // insertion.
+ //
+ // void insert(InputIterator first, InputIterator last):
+ //
+ // Inserts a range of values [`first`, `last`).
+ //
+ // NOTE: Although the STL does not specify which element may be inserted if
+ // multiple keys compare equivalently, for `node_hash_set` we guarantee the
+ // first match is inserted.
+ //
+ // void insert(std::initializer_list<T> ilist):
+ //
+ // Inserts the elements within the initializer list `ilist`.
+ //
+ // NOTE: Although the STL does not specify which element may be inserted if
+ // multiple keys compare equivalently within the initializer list, for
+ // `node_hash_set` we guarantee the first match is inserted.
+ using Base::insert;
+
+ // node_hash_set::emplace()
+ //
+ // Inserts an element of the specified value by constructing it in-place
+ // within the `node_hash_set`, provided that no element with the given key
+ // already exists.
+ //
+ // The element may be constructed even if there already is an element with the
+ // key in the container, in which case the newly constructed element will be
+ // destroyed immediately.
+ //
+ // If rehashing occurs due to the insertion, all iterators are invalidated.
+ using Base::emplace;
+
+ // node_hash_set::emplace_hint()
+ //
+ // Inserts an element of the specified value by constructing it in-place
+ // within the `node_hash_set`, using the position of `hint` as a non-binding
+ // suggestion for where to begin the insertion search, and only inserts
+ // provided that no element with the given key already exists.
+ //
+ // The element may be constructed even if there already is an element with the
+ // key in the container, in which case the newly constructed element will be
+ // destroyed immediately.
+ //
+ // If rehashing occurs due to the insertion, all iterators are invalidated.
+ using Base::emplace_hint;
+
+ // node_hash_set::extract()
+ //
+ // Extracts the indicated element, erasing it in the process, and returns it
+ // as a C++17-compatible node handle. Overloads are listed below.
+ //
+ // node_type extract(const_iterator position):
+ //
+ // Extracts the element at the indicated position and returns a node handle
+ // owning that extracted data.
+ //
+ // node_type extract(const key_type& x):
+ //
+ // Extracts the element with the key matching the passed key value and
+ // returns a node handle owning that extracted data. If the `node_hash_set`
+ // does not contain an element with a matching key, this function returns an
+ // empty node handle.
+ using Base::extract;
+
+ // node_hash_set::merge()
+ //
+ // Extracts elements from a given `source` flat hash map into this
+ // `node_hash_set`. If the destination `node_hash_set` already contains an
+ // element with an equivalent key, that element is not extracted.
+ using Base::merge;
+
+ // node_hash_set::swap(node_hash_set& other)
+ //
+ // Exchanges the contents of this `node_hash_set` with those of the `other`
+ // flat hash map, avoiding invocation of any move, copy, or swap operations on
+ // individual elements.
+ //
+ // All iterators and references on the `node_hash_set` remain valid, excepting
+ // for the past-the-end iterator, which is invalidated.
+ //
+ // `swap()` requires that the flat hash set's hashing and key equivalence
+ // functions be Swappable, and are exchaged using unqualified calls to
+ // non-member `swap()`. If the map's allocator has
+ // `std::allocator_traits<allocator_type>::propagate_on_container_swap::value`
+ // set to `true`, the allocators are also exchanged using an unqualified call
+ // to non-member `swap()`; otherwise, the allocators are not swapped.
+ using Base::swap;
+
+ // node_hash_set::rehash(count)
+ //
+ // Rehashes the `node_hash_set`, setting the number of slots to be at least
+ // the passed value. If the new number of slots increases the load factor more
+ // than the current maximum load factor
+ // (`count` < `size()` / `max_load_factor()`), then the new number of slots
+ // will be at least `size()` / `max_load_factor()`.
+ //
+ // To force a rehash, pass rehash(0).
+ //
+ // NOTE: unlike behavior in `std::unordered_set`, references are also
+ // invalidated upon a `rehash()`.
+ using Base::rehash;
+
+ // node_hash_set::reserve(count)
+ //
+ // Sets the number of slots in the `node_hash_set` to the number needed to
+ // accommodate at least `count` total elements without exceeding the current
+ // maximum load factor, and may rehash the container if needed.
+ using Base::reserve;
+
+ // node_hash_set::contains()
+ //
+ // Determines whether an element comparing equal to the given `key` exists
+ // within the `node_hash_set`, returning `true` if so or `false` otherwise.
+ using Base::contains;
+
+ // node_hash_set::count(const Key& key) const
+ //
+ // Returns the number of elements comparing equal to the given `key` within
+ // the `node_hash_set`. note that this function will return either `1` or `0`
+ // since duplicate elements are not allowed within a `node_hash_set`.
+ using Base::count;
+
+ // node_hash_set::equal_range()
+ //
+ // Returns a closed range [first, last], defined by a `std::pair` of two
+ // iterators, containing all elements with the passed key in the
+ // `node_hash_set`.
+ using Base::equal_range;
+
+ // node_hash_set::find()
+ //
+ // Finds an element with the passed `key` within the `node_hash_set`.
+ using Base::find;
+
+ // node_hash_set::bucket_count()
+ //
+ // Returns the number of "buckets" within the `node_hash_set`. Note that
+ // because a flat hash map contains all elements within its internal storage,
+ // this value simply equals the current capacity of the `node_hash_set`.
+ using Base::bucket_count;
+
+ // node_hash_set::load_factor()
+ //
+ // Returns the current load factor of the `node_hash_set` (the average number
+ // of slots occupied with a value within the hash map).
+ using Base::load_factor;
+
+ // node_hash_set::max_load_factor()
+ //
+ // Manages the maximum load factor of the `node_hash_set`. Overloads are
+ // listed below.
+ //
+ // float node_hash_set::max_load_factor()
+ //
+ // Returns the current maximum load factor of the `node_hash_set`.
+ //
+ // void node_hash_set::max_load_factor(float ml)
+ //
+ // Sets the maximum load factor of the `node_hash_set` to the passed value.
+ //
+ // NOTE: This overload is provided only for API compatibility with the STL;
+ // `node_hash_set` will ignore any set load factor and manage its rehashing
+ // internally as an implementation detail.
+ using Base::max_load_factor;
+
+ // node_hash_set::get_allocator()
+ //
+ // Returns the allocator function associated with this `node_hash_set`.
+ using Base::get_allocator;
+
+ // node_hash_set::hash_function()
+ //
+ // Returns the hashing function used to hash the keys within this
+ // `node_hash_set`.
+ using Base::hash_function;
+
+ // node_hash_set::key_eq()
+ //
+ // Returns the function used for comparing keys equality.
+ using Base::key_eq;
+};
+
+// erase_if(node_hash_set<>, Pred)
+//
+// Erases all elements that satisfy the predicate `pred` from the container `c`.
+template <typename T, typename H, typename E, typename A, typename Predicate>
+void erase_if(node_hash_set<T, H, E, A>& c, Predicate pred) {
+ container_internal::EraseIf(pred, &c);
+}
+
+namespace container_internal {
+
+template <class T>
+struct NodeHashSetPolicy
+ : absl::container_internal::node_hash_policy<T&, NodeHashSetPolicy<T>> {
+ using key_type = T;
+ using init_type = T;
+ using constant_iterators = std::true_type;
+
+ template <class Allocator, class... Args>
+ static T* new_element(Allocator* alloc, Args&&... args) {
+ using ValueAlloc =
+ typename absl::allocator_traits<Allocator>::template rebind_alloc<T>;
+ ValueAlloc value_alloc(*alloc);
+ T* res = absl::allocator_traits<ValueAlloc>::allocate(value_alloc, 1);
+ absl::allocator_traits<ValueAlloc>::construct(value_alloc, res,
+ std::forward<Args>(args)...);
+ return res;
+ }
+
+ template <class Allocator>
+ static void delete_element(Allocator* alloc, T* elem) {
+ using ValueAlloc =
+ typename absl::allocator_traits<Allocator>::template rebind_alloc<T>;
+ ValueAlloc value_alloc(*alloc);
+ absl::allocator_traits<ValueAlloc>::destroy(value_alloc, elem);
+ absl::allocator_traits<ValueAlloc>::deallocate(value_alloc, elem, 1);
+ }
+
+ template <class F, class... Args>
+ static decltype(absl::container_internal::DecomposeValue(
+ std::declval<F>(), std::declval<Args>()...))
+ apply(F&& f, Args&&... args) {
+ return absl::container_internal::DecomposeValue(
+ std::forward<F>(f), std::forward<Args>(args)...);
+ }
+
+ static size_t element_space_used(const T*) { return sizeof(T); }
+};
+} // namespace container_internal
+
+namespace container_algorithm_internal {
+
+// Specialization of trait in absl/algorithm/container.h
+template <class Key, class Hash, class KeyEqual, class Allocator>
+struct IsUnorderedContainer<absl::node_hash_set<Key, Hash, KeyEqual, Allocator>>
+ : std::true_type {};
+
+} // namespace container_algorithm_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_CONTAINER_NODE_HASH_SET_H_
diff --git a/third_party/abseil/src/absl/container/node_hash_set_test.cc b/third_party/abseil/src/absl/container/node_hash_set_test.cc
new file mode 100644
index 0000000..7ddad20
--- /dev/null
+++ b/third_party/abseil/src/absl/container/node_hash_set_test.cc
@@ -0,0 +1,143 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/container/node_hash_set.h"
+
+#include "absl/container/internal/unordered_set_constructor_test.h"
+#include "absl/container/internal/unordered_set_lookup_test.h"
+#include "absl/container/internal/unordered_set_members_test.h"
+#include "absl/container/internal/unordered_set_modifiers_test.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace container_internal {
+namespace {
+using ::absl::container_internal::hash_internal::Enum;
+using ::absl::container_internal::hash_internal::EnumClass;
+using ::testing::IsEmpty;
+using ::testing::Pointee;
+using ::testing::UnorderedElementsAre;
+
+using SetTypes = ::testing::Types<
+ node_hash_set<int, StatefulTestingHash, StatefulTestingEqual, Alloc<int>>,
+ node_hash_set<std::string, StatefulTestingHash, StatefulTestingEqual,
+ Alloc<std::string>>,
+ node_hash_set<Enum, StatefulTestingHash, StatefulTestingEqual, Alloc<Enum>>,
+ node_hash_set<EnumClass, StatefulTestingHash, StatefulTestingEqual,
+ Alloc<EnumClass>>>;
+
+INSTANTIATE_TYPED_TEST_SUITE_P(NodeHashSet, ConstructorTest, SetTypes);
+INSTANTIATE_TYPED_TEST_SUITE_P(NodeHashSet, LookupTest, SetTypes);
+INSTANTIATE_TYPED_TEST_SUITE_P(NodeHashSet, MembersTest, SetTypes);
+INSTANTIATE_TYPED_TEST_SUITE_P(NodeHashSet, ModifiersTest, SetTypes);
+
+TEST(NodeHashSet, MoveableNotCopyableCompiles) {
+ node_hash_set<std::unique_ptr<void*>> t;
+ node_hash_set<std::unique_ptr<void*>> u;
+ u = std::move(t);
+}
+
+TEST(NodeHashSet, MergeExtractInsert) {
+ struct Hash {
+ size_t operator()(const std::unique_ptr<int>& p) const { return *p; }
+ };
+ struct Eq {
+ bool operator()(const std::unique_ptr<int>& a,
+ const std::unique_ptr<int>& b) const {
+ return *a == *b;
+ }
+ };
+ absl::node_hash_set<std::unique_ptr<int>, Hash, Eq> set1, set2;
+ set1.insert(absl::make_unique<int>(7));
+ set1.insert(absl::make_unique<int>(17));
+
+ set2.insert(absl::make_unique<int>(7));
+ set2.insert(absl::make_unique<int>(19));
+
+ EXPECT_THAT(set1, UnorderedElementsAre(Pointee(7), Pointee(17)));
+ EXPECT_THAT(set2, UnorderedElementsAre(Pointee(7), Pointee(19)));
+
+ set1.merge(set2);
+
+ EXPECT_THAT(set1, UnorderedElementsAre(Pointee(7), Pointee(17), Pointee(19)));
+ EXPECT_THAT(set2, UnorderedElementsAre(Pointee(7)));
+
+ auto node = set1.extract(absl::make_unique<int>(7));
+ EXPECT_TRUE(node);
+ EXPECT_THAT(node.value(), Pointee(7));
+ EXPECT_THAT(set1, UnorderedElementsAre(Pointee(17), Pointee(19)));
+
+ auto insert_result = set2.insert(std::move(node));
+ EXPECT_FALSE(node);
+ EXPECT_FALSE(insert_result.inserted);
+ EXPECT_TRUE(insert_result.node);
+ EXPECT_THAT(insert_result.node.value(), Pointee(7));
+ EXPECT_EQ(**insert_result.position, 7);
+ EXPECT_NE(insert_result.position->get(), insert_result.node.value().get());
+ EXPECT_THAT(set2, UnorderedElementsAre(Pointee(7)));
+
+ node = set1.extract(absl::make_unique<int>(17));
+ EXPECT_TRUE(node);
+ EXPECT_THAT(node.value(), Pointee(17));
+ EXPECT_THAT(set1, UnorderedElementsAre(Pointee(19)));
+
+ node.value() = absl::make_unique<int>(23);
+
+ insert_result = set2.insert(std::move(node));
+ EXPECT_FALSE(node);
+ EXPECT_TRUE(insert_result.inserted);
+ EXPECT_FALSE(insert_result.node);
+ EXPECT_EQ(**insert_result.position, 23);
+ EXPECT_THAT(set2, UnorderedElementsAre(Pointee(7), Pointee(23)));
+}
+
+bool IsEven(int k) { return k % 2 == 0; }
+
+TEST(NodeHashSet, EraseIf) {
+ // Erase all elements.
+ {
+ node_hash_set<int> s = {1, 2, 3, 4, 5};
+ erase_if(s, [](int) { return true; });
+ EXPECT_THAT(s, IsEmpty());
+ }
+ // Erase no elements.
+ {
+ node_hash_set<int> s = {1, 2, 3, 4, 5};
+ erase_if(s, [](int) { return false; });
+ EXPECT_THAT(s, UnorderedElementsAre(1, 2, 3, 4, 5));
+ }
+ // Erase specific elements.
+ {
+ node_hash_set<int> s = {1, 2, 3, 4, 5};
+ erase_if(s, [](int k) { return k % 2 == 1; });
+ EXPECT_THAT(s, UnorderedElementsAre(2, 4));
+ }
+ // Predicate is function reference.
+ {
+ node_hash_set<int> s = {1, 2, 3, 4, 5};
+ erase_if(s, IsEven);
+ EXPECT_THAT(s, UnorderedElementsAre(1, 3, 5));
+ }
+ // Predicate is function pointer.
+ {
+ node_hash_set<int> s = {1, 2, 3, 4, 5};
+ erase_if(s, &IsEven);
+ EXPECT_THAT(s, UnorderedElementsAre(1, 3, 5));
+ }
+}
+
+} // namespace
+} // namespace container_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/copts/AbseilConfigureCopts.cmake b/third_party/abseil/src/absl/copts/AbseilConfigureCopts.cmake
new file mode 100644
index 0000000..acd46d0
--- /dev/null
+++ b/third_party/abseil/src/absl/copts/AbseilConfigureCopts.cmake
@@ -0,0 +1,67 @@
+# See absl/copts/copts.py and absl/copts/generate_copts.py
+include(GENERATED_AbseilCopts)
+
+set(ABSL_LSAN_LINKOPTS "")
+set(ABSL_HAVE_LSAN OFF)
+set(ABSL_DEFAULT_LINKOPTS "")
+
+if (BUILD_SHARED_LIBS AND MSVC)
+ set(ABSL_BUILD_DLL TRUE)
+ set(CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS ON)
+else()
+ set(ABSL_BUILD_DLL FALSE)
+endif()
+
+if("${CMAKE_SYSTEM_PROCESSOR}" MATCHES "x86_64|amd64|AMD64")
+ if (MSVC)
+ set(ABSL_RANDOM_RANDEN_COPTS "${ABSL_RANDOM_HWAES_MSVC_X64_FLAGS}")
+ else()
+ set(ABSL_RANDOM_RANDEN_COPTS "${ABSL_RANDOM_HWAES_X64_FLAGS}")
+ endif()
+elseif("${CMAKE_SYSTEM_PROCESSOR}" MATCHES "arm.*|aarch64")
+ if ("${CMAKE_SIZEOF_VOID_P}" STREQUAL "8")
+ set(ABSL_RANDOM_RANDEN_COPTS "${ABSL_RANDOM_HWAES_ARM64_FLAGS}")
+ elseif("${CMAKE_SIZEOF_VOID_P}" STREQUAL "4")
+ set(ABSL_RANDOM_RANDEN_COPTS "${ABSL_RANDOM_HWAES_ARM32_FLAGS}")
+ else()
+ message(WARNING "Value of CMAKE_SIZEOF_VOID_P (${CMAKE_SIZEOF_VOID_P}) is not supported.")
+ endif()
+else()
+ message(WARNING "Value of CMAKE_SYSTEM_PROCESSOR (${CMAKE_SYSTEM_PROCESSOR}) is unknown and cannot be used to set ABSL_RANDOM_RANDEN_COPTS")
+ set(ABSL_RANDOM_RANDEN_COPTS "")
+endif()
+
+
+if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
+ set(ABSL_DEFAULT_COPTS "${ABSL_GCC_FLAGS}")
+ set(ABSL_TEST_COPTS "${ABSL_GCC_FLAGS};${ABSL_GCC_TEST_FLAGS}")
+elseif("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang")
+ # MATCHES so we get both Clang and AppleClang
+ if(MSVC)
+ # clang-cl is half MSVC, half LLVM
+ set(ABSL_DEFAULT_COPTS "${ABSL_CLANG_CL_FLAGS}")
+ set(ABSL_TEST_COPTS "${ABSL_CLANG_CL_FLAGS};${ABSL_CLANG_CL_TEST_FLAGS}")
+ set(ABSL_DEFAULT_LINKOPTS "${ABSL_MSVC_LINKOPTS}")
+ else()
+ set(ABSL_DEFAULT_COPTS "${ABSL_LLVM_FLAGS}")
+ set(ABSL_TEST_COPTS "${ABSL_LLVM_FLAGS};${ABSL_LLVM_TEST_FLAGS}")
+ if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
+ # AppleClang doesn't have lsan
+ # https://developer.apple.com/documentation/code_diagnostics
+ if(NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 3.5)
+ set(ABSL_LSAN_LINKOPTS "-fsanitize=leak")
+ set(ABSL_HAVE_LSAN ON)
+ endif()
+ endif()
+ endif()
+elseif("${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC")
+ set(ABSL_DEFAULT_COPTS "${ABSL_MSVC_FLAGS}")
+ set(ABSL_TEST_COPTS "${ABSL_MSVC_FLAGS};${ABSL_MSVC_TEST_FLAGS}")
+ set(ABSL_DEFAULT_LINKOPTS "${ABSL_MSVC_LINKOPTS}")
+else()
+ message(WARNING "Unknown compiler: ${CMAKE_CXX_COMPILER}. Building with no default flags")
+ set(ABSL_DEFAULT_COPTS "")
+ set(ABSL_TEST_COPTS "")
+endif()
+
+set(ABSL_CXX_STANDARD "${CMAKE_CXX_STANDARD}")
diff --git a/third_party/abseil/src/absl/copts/GENERATED_AbseilCopts.cmake b/third_party/abseil/src/absl/copts/GENERATED_AbseilCopts.cmake
new file mode 100644
index 0000000..51742c9
--- /dev/null
+++ b/third_party/abseil/src/absl/copts/GENERATED_AbseilCopts.cmake
@@ -0,0 +1,162 @@
+# GENERATED! DO NOT MANUALLY EDIT THIS FILE.
+#
+# (1) Edit absl/copts/copts.py.
+# (2) Run `python <path_to_absl>/copts/generate_copts.py`.
+
+list(APPEND ABSL_CLANG_CL_FLAGS
+ "/W3"
+ "/DNOMINMAX"
+ "/DWIN32_LEAN_AND_MEAN"
+ "/D_CRT_SECURE_NO_WARNINGS"
+ "/D_SCL_SECURE_NO_WARNINGS"
+ "/D_ENABLE_EXTENDED_ALIGNED_STORAGE"
+)
+
+list(APPEND ABSL_CLANG_CL_TEST_FLAGS
+ "-Wno-c99-extensions"
+ "-Wno-deprecated-declarations"
+ "-Wno-missing-noreturn"
+ "-Wno-missing-prototypes"
+ "-Wno-missing-variable-declarations"
+ "-Wno-null-conversion"
+ "-Wno-shadow"
+ "-Wno-shift-sign-overflow"
+ "-Wno-sign-compare"
+ "-Wno-unused-function"
+ "-Wno-unused-member-function"
+ "-Wno-unused-parameter"
+ "-Wno-unused-private-field"
+ "-Wno-unused-template"
+ "-Wno-used-but-marked-unused"
+ "-Wno-zero-as-null-pointer-constant"
+ "-Wno-gnu-zero-variadic-macro-arguments"
+)
+
+list(APPEND ABSL_GCC_FLAGS
+ "-Wall"
+ "-Wextra"
+ "-Wcast-qual"
+ "-Wconversion-null"
+ "-Wformat-security"
+ "-Wmissing-declarations"
+ "-Woverlength-strings"
+ "-Wpointer-arith"
+ "-Wundef"
+ "-Wunused-local-typedefs"
+ "-Wunused-result"
+ "-Wvarargs"
+ "-Wvla"
+ "-Wwrite-strings"
+ "-DNOMINMAX"
+)
+
+list(APPEND ABSL_GCC_TEST_FLAGS
+ "-Wno-conversion-null"
+ "-Wno-deprecated-declarations"
+ "-Wno-missing-declarations"
+ "-Wno-sign-compare"
+ "-Wno-unused-function"
+ "-Wno-unused-parameter"
+ "-Wno-unused-private-field"
+)
+
+list(APPEND ABSL_LLVM_FLAGS
+ "-Wall"
+ "-Wextra"
+ "-Wcast-qual"
+ "-Wconversion"
+ "-Wfloat-overflow-conversion"
+ "-Wfloat-zero-conversion"
+ "-Wfor-loop-analysis"
+ "-Wformat-security"
+ "-Wgnu-redeclared-enum"
+ "-Winfinite-recursion"
+ "-Wliteral-conversion"
+ "-Wmissing-declarations"
+ "-Woverlength-strings"
+ "-Wpointer-arith"
+ "-Wself-assign"
+ "-Wshadow"
+ "-Wstring-conversion"
+ "-Wtautological-overlap-compare"
+ "-Wundef"
+ "-Wuninitialized"
+ "-Wunreachable-code"
+ "-Wunused-comparison"
+ "-Wunused-local-typedefs"
+ "-Wunused-result"
+ "-Wvla"
+ "-Wwrite-strings"
+ "-Wno-float-conversion"
+ "-Wno-implicit-float-conversion"
+ "-Wno-implicit-int-float-conversion"
+ "-Wno-implicit-int-conversion"
+ "-Wno-shorten-64-to-32"
+ "-Wno-sign-conversion"
+ "-DNOMINMAX"
+)
+
+list(APPEND ABSL_LLVM_TEST_FLAGS
+ "-Wno-c99-extensions"
+ "-Wno-deprecated-declarations"
+ "-Wno-missing-noreturn"
+ "-Wno-missing-prototypes"
+ "-Wno-missing-variable-declarations"
+ "-Wno-null-conversion"
+ "-Wno-shadow"
+ "-Wno-shift-sign-overflow"
+ "-Wno-sign-compare"
+ "-Wno-unused-function"
+ "-Wno-unused-member-function"
+ "-Wno-unused-parameter"
+ "-Wno-unused-private-field"
+ "-Wno-unused-template"
+ "-Wno-used-but-marked-unused"
+ "-Wno-zero-as-null-pointer-constant"
+ "-Wno-gnu-zero-variadic-macro-arguments"
+)
+
+list(APPEND ABSL_MSVC_FLAGS
+ "/W3"
+ "/DNOMINMAX"
+ "/DWIN32_LEAN_AND_MEAN"
+ "/D_CRT_SECURE_NO_WARNINGS"
+ "/D_SCL_SECURE_NO_WARNINGS"
+ "/D_ENABLE_EXTENDED_ALIGNED_STORAGE"
+ "/bigobj"
+ "/wd4005"
+ "/wd4068"
+ "/wd4180"
+ "/wd4244"
+ "/wd4267"
+ "/wd4503"
+ "/wd4800"
+)
+
+list(APPEND ABSL_MSVC_LINKOPTS
+ "-ignore:4221"
+)
+
+list(APPEND ABSL_MSVC_TEST_FLAGS
+ "/wd4018"
+ "/wd4101"
+ "/wd4503"
+ "/wd4996"
+ "/DNOMINMAX"
+)
+
+list(APPEND ABSL_RANDOM_HWAES_ARM32_FLAGS
+ "-mfpu=neon"
+)
+
+list(APPEND ABSL_RANDOM_HWAES_ARM64_FLAGS
+ "-march=armv8-a+crypto"
+)
+
+list(APPEND ABSL_RANDOM_HWAES_MSVC_X64_FLAGS
+)
+
+list(APPEND ABSL_RANDOM_HWAES_X64_FLAGS
+ "-maes"
+ "-msse4.1"
+)
diff --git a/third_party/abseil/src/absl/copts/GENERATED_copts.bzl b/third_party/abseil/src/absl/copts/GENERATED_copts.bzl
new file mode 100644
index 0000000..6707488
--- /dev/null
+++ b/third_party/abseil/src/absl/copts/GENERATED_copts.bzl
@@ -0,0 +1,163 @@
+"""GENERATED! DO NOT MANUALLY EDIT THIS FILE.
+
+(1) Edit absl/copts/copts.py.
+(2) Run `python <path_to_absl>/copts/generate_copts.py`.
+"""
+
+ABSL_CLANG_CL_FLAGS = [
+ "/W3",
+ "/DNOMINMAX",
+ "/DWIN32_LEAN_AND_MEAN",
+ "/D_CRT_SECURE_NO_WARNINGS",
+ "/D_SCL_SECURE_NO_WARNINGS",
+ "/D_ENABLE_EXTENDED_ALIGNED_STORAGE",
+]
+
+ABSL_CLANG_CL_TEST_FLAGS = [
+ "-Wno-c99-extensions",
+ "-Wno-deprecated-declarations",
+ "-Wno-missing-noreturn",
+ "-Wno-missing-prototypes",
+ "-Wno-missing-variable-declarations",
+ "-Wno-null-conversion",
+ "-Wno-shadow",
+ "-Wno-shift-sign-overflow",
+ "-Wno-sign-compare",
+ "-Wno-unused-function",
+ "-Wno-unused-member-function",
+ "-Wno-unused-parameter",
+ "-Wno-unused-private-field",
+ "-Wno-unused-template",
+ "-Wno-used-but-marked-unused",
+ "-Wno-zero-as-null-pointer-constant",
+ "-Wno-gnu-zero-variadic-macro-arguments",
+]
+
+ABSL_GCC_FLAGS = [
+ "-Wall",
+ "-Wextra",
+ "-Wcast-qual",
+ "-Wconversion-null",
+ "-Wformat-security",
+ "-Wmissing-declarations",
+ "-Woverlength-strings",
+ "-Wpointer-arith",
+ "-Wundef",
+ "-Wunused-local-typedefs",
+ "-Wunused-result",
+ "-Wvarargs",
+ "-Wvla",
+ "-Wwrite-strings",
+ "-DNOMINMAX",
+]
+
+ABSL_GCC_TEST_FLAGS = [
+ "-Wno-conversion-null",
+ "-Wno-deprecated-declarations",
+ "-Wno-missing-declarations",
+ "-Wno-sign-compare",
+ "-Wno-unused-function",
+ "-Wno-unused-parameter",
+ "-Wno-unused-private-field",
+]
+
+ABSL_LLVM_FLAGS = [
+ "-Wall",
+ "-Wextra",
+ "-Wcast-qual",
+ "-Wconversion",
+ "-Wfloat-overflow-conversion",
+ "-Wfloat-zero-conversion",
+ "-Wfor-loop-analysis",
+ "-Wformat-security",
+ "-Wgnu-redeclared-enum",
+ "-Winfinite-recursion",
+ "-Wliteral-conversion",
+ "-Wmissing-declarations",
+ "-Woverlength-strings",
+ "-Wpointer-arith",
+ "-Wself-assign",
+ "-Wshadow",
+ "-Wstring-conversion",
+ "-Wtautological-overlap-compare",
+ "-Wundef",
+ "-Wuninitialized",
+ "-Wunreachable-code",
+ "-Wunused-comparison",
+ "-Wunused-local-typedefs",
+ "-Wunused-result",
+ "-Wvla",
+ "-Wwrite-strings",
+ "-Wno-float-conversion",
+ "-Wno-implicit-float-conversion",
+ "-Wno-implicit-int-float-conversion",
+ "-Wno-implicit-int-conversion",
+ "-Wno-shorten-64-to-32",
+ "-Wno-sign-conversion",
+ "-DNOMINMAX",
+]
+
+ABSL_LLVM_TEST_FLAGS = [
+ "-Wno-c99-extensions",
+ "-Wno-deprecated-declarations",
+ "-Wno-missing-noreturn",
+ "-Wno-missing-prototypes",
+ "-Wno-missing-variable-declarations",
+ "-Wno-null-conversion",
+ "-Wno-shadow",
+ "-Wno-shift-sign-overflow",
+ "-Wno-sign-compare",
+ "-Wno-unused-function",
+ "-Wno-unused-member-function",
+ "-Wno-unused-parameter",
+ "-Wno-unused-private-field",
+ "-Wno-unused-template",
+ "-Wno-used-but-marked-unused",
+ "-Wno-zero-as-null-pointer-constant",
+ "-Wno-gnu-zero-variadic-macro-arguments",
+]
+
+ABSL_MSVC_FLAGS = [
+ "/W3",
+ "/DNOMINMAX",
+ "/DWIN32_LEAN_AND_MEAN",
+ "/D_CRT_SECURE_NO_WARNINGS",
+ "/D_SCL_SECURE_NO_WARNINGS",
+ "/D_ENABLE_EXTENDED_ALIGNED_STORAGE",
+ "/bigobj",
+ "/wd4005",
+ "/wd4068",
+ "/wd4180",
+ "/wd4244",
+ "/wd4267",
+ "/wd4503",
+ "/wd4800",
+]
+
+ABSL_MSVC_LINKOPTS = [
+ "-ignore:4221",
+]
+
+ABSL_MSVC_TEST_FLAGS = [
+ "/wd4018",
+ "/wd4101",
+ "/wd4503",
+ "/wd4996",
+ "/DNOMINMAX",
+]
+
+ABSL_RANDOM_HWAES_ARM32_FLAGS = [
+ "-mfpu=neon",
+]
+
+ABSL_RANDOM_HWAES_ARM64_FLAGS = [
+ "-march=armv8-a+crypto",
+]
+
+ABSL_RANDOM_HWAES_MSVC_X64_FLAGS = [
+]
+
+ABSL_RANDOM_HWAES_X64_FLAGS = [
+ "-maes",
+ "-msse4.1",
+]
diff --git a/third_party/abseil/src/absl/copts/configure_copts.bzl b/third_party/abseil/src/absl/copts/configure_copts.bzl
new file mode 100644
index 0000000..4d34254
--- /dev/null
+++ b/third_party/abseil/src/absl/copts/configure_copts.bzl
@@ -0,0 +1,76 @@
+"""absl specific copts.
+
+This file simply selects the correct options from the generated files. To
+change Abseil copts, edit absl/copts/copts.py
+"""
+
+load(
+ "//absl:copts/GENERATED_copts.bzl",
+ "ABSL_CLANG_CL_FLAGS",
+ "ABSL_CLANG_CL_TEST_FLAGS",
+ "ABSL_GCC_FLAGS",
+ "ABSL_GCC_TEST_FLAGS",
+ "ABSL_LLVM_FLAGS",
+ "ABSL_LLVM_TEST_FLAGS",
+ "ABSL_MSVC_FLAGS",
+ "ABSL_MSVC_LINKOPTS",
+ "ABSL_MSVC_TEST_FLAGS",
+ "ABSL_RANDOM_HWAES_ARM32_FLAGS",
+ "ABSL_RANDOM_HWAES_ARM64_FLAGS",
+ "ABSL_RANDOM_HWAES_MSVC_X64_FLAGS",
+ "ABSL_RANDOM_HWAES_X64_FLAGS",
+)
+
+ABSL_DEFAULT_COPTS = select({
+ "//absl:windows": ABSL_MSVC_FLAGS,
+ "//absl:clang_compiler": ABSL_LLVM_FLAGS,
+ "//conditions:default": ABSL_GCC_FLAGS,
+})
+
+ABSL_TEST_COPTS = ABSL_DEFAULT_COPTS + select({
+ "//absl:windows": ABSL_MSVC_TEST_FLAGS,
+ "//absl:clang_compiler": ABSL_LLVM_TEST_FLAGS,
+ "//conditions:default": ABSL_GCC_TEST_FLAGS,
+})
+
+ABSL_DEFAULT_LINKOPTS = select({
+ "//absl:windows": ABSL_MSVC_LINKOPTS,
+ "//conditions:default": [],
+})
+
+# ABSL_RANDOM_RANDEN_COPTS blaze copts flags which are required by each
+# environment to build an accelerated RandenHwAes library.
+ABSL_RANDOM_RANDEN_COPTS = select({
+ # APPLE
+ ":cpu_darwin_x86_64": ABSL_RANDOM_HWAES_X64_FLAGS,
+ ":cpu_darwin": ABSL_RANDOM_HWAES_X64_FLAGS,
+ ":cpu_x64_windows_msvc": ABSL_RANDOM_HWAES_MSVC_X64_FLAGS,
+ ":cpu_x64_windows": ABSL_RANDOM_HWAES_MSVC_X64_FLAGS,
+ ":cpu_k8": ABSL_RANDOM_HWAES_X64_FLAGS,
+ ":cpu_ppc": ["-mcrypto"],
+
+ # Supported by default or unsupported.
+ "//conditions:default": [],
+})
+
+# absl_random_randen_copts_init:
+# Initialize the config targets based on cpu, os, etc. used to select
+# the required values for ABSL_RANDOM_RANDEN_COPTS
+def absl_random_randen_copts_init():
+ """Initialize the config_settings used by ABSL_RANDOM_RANDEN_COPTS."""
+
+ # CPU configs.
+ # These configs have consistent flags to enable HWAES intsructions.
+ cpu_configs = [
+ "ppc",
+ "k8",
+ "darwin_x86_64",
+ "darwin",
+ "x64_windows_msvc",
+ "x64_windows",
+ ]
+ for cpu in cpu_configs:
+ native.config_setting(
+ name = "cpu_%s" % cpu,
+ values = {"cpu": cpu},
+ )
diff --git a/third_party/abseil/src/absl/copts/copts.py b/third_party/abseil/src/absl/copts/copts.py
new file mode 100644
index 0000000..cf52981
--- /dev/null
+++ b/third_party/abseil/src/absl/copts/copts.py
@@ -0,0 +1,162 @@
+"""Abseil compiler options.
+
+This is the source of truth for Abseil compiler options. To modify Abseil
+compilation options:
+
+ (1) Edit the appropriate list in this file based on the platform the flag is
+ needed on.
+ (2) Run `<path_to_absl>/copts/generate_copts.py`.
+
+The generated copts are consumed by configure_copts.bzl and
+AbseilConfigureCopts.cmake.
+"""
+
+# /Wall with msvc includes unhelpful warnings such as C4711, C4710, ...
+MSVC_BIG_WARNING_FLAGS = [
+ "/W3",
+]
+
+LLVM_TEST_DISABLE_WARNINGS_FLAGS = [
+ "-Wno-c99-extensions",
+ "-Wno-deprecated-declarations",
+ "-Wno-missing-noreturn",
+ "-Wno-missing-prototypes",
+ "-Wno-missing-variable-declarations",
+ "-Wno-null-conversion",
+ "-Wno-shadow",
+ "-Wno-shift-sign-overflow",
+ "-Wno-sign-compare",
+ "-Wno-unused-function",
+ "-Wno-unused-member-function",
+ "-Wno-unused-parameter",
+ "-Wno-unused-private-field",
+ "-Wno-unused-template",
+ "-Wno-used-but-marked-unused",
+ "-Wno-zero-as-null-pointer-constant",
+ # gtest depends on this GNU extension being offered.
+ "-Wno-gnu-zero-variadic-macro-arguments",
+]
+
+MSVC_DEFINES = [
+ "/DNOMINMAX", # Don't define min and max macros (windows.h)
+ # Don't bloat namespace with incompatible winsock versions.
+ "/DWIN32_LEAN_AND_MEAN",
+ # Don't warn about usage of insecure C functions.
+ "/D_CRT_SECURE_NO_WARNINGS",
+ "/D_SCL_SECURE_NO_WARNINGS",
+ # Introduced in VS 2017 15.8, allow overaligned types in aligned_storage
+ "/D_ENABLE_EXTENDED_ALIGNED_STORAGE",
+]
+
+COPT_VARS = {
+ "ABSL_GCC_FLAGS": [
+ "-Wall",
+ "-Wextra",
+ "-Wcast-qual",
+ "-Wconversion-null",
+ "-Wformat-security",
+ "-Wmissing-declarations",
+ "-Woverlength-strings",
+ "-Wpointer-arith",
+ "-Wundef",
+ "-Wunused-local-typedefs",
+ "-Wunused-result",
+ "-Wvarargs",
+ "-Wvla", # variable-length array
+ "-Wwrite-strings",
+ # Don't define min and max macros (Build on Windows using gcc)
+ "-DNOMINMAX",
+ ],
+ "ABSL_GCC_TEST_FLAGS": [
+ "-Wno-conversion-null",
+ "-Wno-deprecated-declarations",
+ "-Wno-missing-declarations",
+ "-Wno-sign-compare",
+ "-Wno-unused-function",
+ "-Wno-unused-parameter",
+ "-Wno-unused-private-field",
+ ],
+ "ABSL_LLVM_FLAGS": [
+ "-Wall",
+ "-Wextra",
+ "-Wcast-qual",
+ "-Wconversion",
+ "-Wfloat-overflow-conversion",
+ "-Wfloat-zero-conversion",
+ "-Wfor-loop-analysis",
+ "-Wformat-security",
+ "-Wgnu-redeclared-enum",
+ "-Winfinite-recursion",
+ "-Wliteral-conversion",
+ "-Wmissing-declarations",
+ "-Woverlength-strings",
+ "-Wpointer-arith",
+ "-Wself-assign",
+ "-Wshadow",
+ "-Wstring-conversion",
+ "-Wtautological-overlap-compare",
+ "-Wundef",
+ "-Wuninitialized",
+ "-Wunreachable-code",
+ "-Wunused-comparison",
+ "-Wunused-local-typedefs",
+ "-Wunused-result",
+ "-Wvla",
+ "-Wwrite-strings",
+ # Warnings that are enabled by group warning flags like -Wall that we
+ # explicitly disable.
+ "-Wno-float-conversion",
+ "-Wno-implicit-float-conversion",
+ "-Wno-implicit-int-float-conversion",
+ "-Wno-implicit-int-conversion",
+ "-Wno-shorten-64-to-32",
+ "-Wno-sign-conversion",
+ # Don't define min and max macros (Build on Windows using clang)
+ "-DNOMINMAX",
+ ],
+ "ABSL_LLVM_TEST_FLAGS":
+ LLVM_TEST_DISABLE_WARNINGS_FLAGS,
+ "ABSL_CLANG_CL_FLAGS":
+ (MSVC_BIG_WARNING_FLAGS + MSVC_DEFINES),
+ "ABSL_CLANG_CL_TEST_FLAGS":
+ LLVM_TEST_DISABLE_WARNINGS_FLAGS,
+ "ABSL_MSVC_FLAGS":
+ MSVC_BIG_WARNING_FLAGS + MSVC_DEFINES + [
+ # Increase the number of sections available in object files
+ "/bigobj",
+ "/wd4005", # macro-redefinition
+ "/wd4068", # unknown pragma
+ # qualifier applied to function type has no meaning; ignored
+ "/wd4180",
+ # conversion from 'type1' to 'type2', possible loss of data
+ "/wd4244",
+ # conversion from 'size_t' to 'type', possible loss of data
+ "/wd4267",
+ # The decorated name was longer than the compiler limit
+ "/wd4503",
+ # forcing value to bool 'true' or 'false' (performance warning)
+ "/wd4800",
+ ],
+ "ABSL_MSVC_TEST_FLAGS": [
+ "/wd4018", # signed/unsigned mismatch
+ "/wd4101", # unreferenced local variable
+ "/wd4503", # decorated name length exceeded, name was truncated
+ "/wd4996", # use of deprecated symbol
+ "/DNOMINMAX", # disable the min() and max() macros from <windows.h>
+ ],
+ "ABSL_MSVC_LINKOPTS": [
+ # Object file doesn't export any previously undefined symbols
+ "-ignore:4221",
+ ],
+ # "HWAES" is an abbreviation for "hardware AES" (AES - Advanced Encryption
+ # Standard). These flags are used for detecting whether or not the target
+ # architecture has hardware support for AES instructions which can be used
+ # to improve performance of some random bit generators.
+ "ABSL_RANDOM_HWAES_ARM64_FLAGS": ["-march=armv8-a+crypto"],
+ "ABSL_RANDOM_HWAES_ARM32_FLAGS": ["-mfpu=neon"],
+ "ABSL_RANDOM_HWAES_X64_FLAGS": [
+ "-maes",
+ "-msse4.1",
+ ],
+ "ABSL_RANDOM_HWAES_MSVC_X64_FLAGS": [],
+}
diff --git a/third_party/abseil/src/absl/copts/generate_copts.py b/third_party/abseil/src/absl/copts/generate_copts.py
new file mode 100755
index 0000000..0e5dc9f
--- /dev/null
+++ b/third_party/abseil/src/absl/copts/generate_copts.py
@@ -0,0 +1,109 @@
+#!/usr/bin/python
+"""Generate Abseil compile compile option configs.
+
+Usage: <path_to_absl>/copts/generate_copts.py
+
+The configs are generated from copts.py.
+"""
+
+from os import path
+import sys
+from copts import COPT_VARS
+
+
+# Helper functions
+def file_header_lines():
+ return [
+ "GENERATED! DO NOT MANUALLY EDIT THIS FILE.", "",
+ "(1) Edit absl/copts/copts.py.",
+ "(2) Run `python <path_to_absl>/copts/generate_copts.py`."
+ ]
+
+
+def flatten(*lists):
+ return [item for sublist in lists for item in sublist]
+
+
+def relative_filename(filename):
+ return path.join(path.dirname(__file__), filename)
+
+
+# Style classes. These contain all the syntactic styling needed to generate a
+# copt file for different build tools.
+class CMakeStyle(object):
+ """Style object for CMake copts file."""
+
+ def separator(self):
+ return ""
+
+ def list_introducer(self, name):
+ return "list(APPEND " + name
+
+ def list_closer(self):
+ return ")\n"
+
+ def docstring(self):
+ return "\n".join((("# " + line).strip() for line in file_header_lines()))
+
+ def filename(self):
+ return "GENERATED_AbseilCopts.cmake"
+
+
+class StarlarkStyle(object):
+ """Style object for Starlark copts file."""
+
+ def separator(self):
+ return ","
+
+ def list_introducer(self, name):
+ return name + " = ["
+
+ def list_closer(self):
+ return "]\n"
+
+ def docstring(self):
+ docstring_quotes = "\"\"\""
+ return docstring_quotes + "\n".join(
+ flatten(file_header_lines(), [docstring_quotes]))
+
+ def filename(self):
+ return "GENERATED_copts.bzl"
+
+
+def copt_list(name, arg_list, style):
+ """Copt file generation."""
+
+ make_line = lambda s: " \"" + s + "\"" + style.separator()
+ external_str_list = [make_line(s) for s in arg_list]
+
+ return "\n".join(
+ flatten(
+ [style.list_introducer(name)],
+ external_str_list,
+ [style.list_closer()]))
+
+
+def generate_copt_file(style):
+ """Creates a generated copt file using the given style object.
+
+ Args:
+ style: either StarlarkStyle() or CMakeStyle()
+ """
+ with open(relative_filename(style.filename()), "w") as f:
+ f.write(style.docstring())
+ f.write("\n")
+ for var_name, arg_list in sorted(COPT_VARS.items()):
+ f.write("\n")
+ f.write(copt_list(var_name, arg_list, style))
+
+
+def main(argv):
+ if len(argv) > 1:
+ raise RuntimeError("generate_copts needs no command line args")
+
+ generate_copt_file(StarlarkStyle())
+ generate_copt_file(CMakeStyle())
+
+
+if __name__ == "__main__":
+ main(sys.argv)
diff --git a/third_party/abseil/src/absl/debugging/BUILD.bazel b/third_party/abseil/src/absl/debugging/BUILD.bazel
new file mode 100644
index 0000000..cd6e454
--- /dev/null
+++ b/third_party/abseil/src/absl/debugging/BUILD.bazel
@@ -0,0 +1,347 @@
+#
+# Copyright 2017 The Abseil Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+load("@rules_cc//cc:defs.bzl", "cc_library", "cc_test")
+load(
+ "//absl:copts/configure_copts.bzl",
+ "ABSL_DEFAULT_COPTS",
+ "ABSL_DEFAULT_LINKOPTS",
+ "ABSL_TEST_COPTS",
+)
+
+package(
+ default_visibility = ["//visibility:public"],
+)
+
+licenses(["notice"])
+
+cc_library(
+ name = "stacktrace",
+ srcs = [
+ "internal/stacktrace_aarch64-inl.inc",
+ "internal/stacktrace_arm-inl.inc",
+ "internal/stacktrace_config.h",
+ "internal/stacktrace_generic-inl.inc",
+ "internal/stacktrace_powerpc-inl.inc",
+ "internal/stacktrace_unimplemented-inl.inc",
+ "internal/stacktrace_win32-inl.inc",
+ "internal/stacktrace_x86-inl.inc",
+ "stacktrace.cc",
+ ],
+ hdrs = ["stacktrace.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":debugging_internal",
+ "//absl/base:config",
+ "//absl/base:core_headers",
+ ],
+)
+
+cc_library(
+ name = "symbolize",
+ srcs = [
+ "symbolize.cc",
+ "symbolize_darwin.inc",
+ "symbolize_elf.inc",
+ "symbolize_unimplemented.inc",
+ "symbolize_win32.inc",
+ ],
+ hdrs = [
+ "internal/symbolize.h",
+ "symbolize.h",
+ ],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS + select({
+ "//absl:windows": ["-DEFAULTLIB:dbghelp.lib"],
+ "//conditions:default": [],
+ }),
+ deps = [
+ ":debugging_internal",
+ ":demangle_internal",
+ "//absl/base",
+ "//absl/base:config",
+ "//absl/base:core_headers",
+ "//absl/base:dynamic_annotations",
+ "//absl/base:malloc_internal",
+ "//absl/base:raw_logging_internal",
+ "//absl/strings",
+ ],
+)
+
+cc_test(
+ name = "symbolize_test",
+ srcs = ["symbolize_test.cc"],
+ copts = ABSL_TEST_COPTS + select({
+ "//absl:windows": ["/Z7"],
+ "//conditions:default": [],
+ }),
+ linkopts = ABSL_DEFAULT_LINKOPTS + select({
+ "//absl:windows": ["/DEBUG"],
+ "//conditions:default": [],
+ }),
+ deps = [
+ ":stack_consumption",
+ ":symbolize",
+ "//absl/base",
+ "//absl/base:config",
+ "//absl/base:core_headers",
+ "//absl/base:raw_logging_internal",
+ "//absl/memory",
+ "//absl/strings",
+ "@com_google_googletest//:gtest",
+ ],
+)
+
+cc_library(
+ name = "examine_stack",
+ srcs = [
+ "internal/examine_stack.cc",
+ ],
+ hdrs = [
+ "internal/examine_stack.h",
+ ],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ visibility = ["//visibility:private"],
+ deps = [
+ ":stacktrace",
+ ":symbolize",
+ "//absl/base:config",
+ "//absl/base:core_headers",
+ "//absl/base:raw_logging_internal",
+ ],
+)
+
+cc_library(
+ name = "failure_signal_handler",
+ srcs = ["failure_signal_handler.cc"],
+ hdrs = ["failure_signal_handler.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":examine_stack",
+ ":stacktrace",
+ "//absl/base",
+ "//absl/base:config",
+ "//absl/base:core_headers",
+ "//absl/base:errno_saver",
+ "//absl/base:raw_logging_internal",
+ ],
+)
+
+cc_test(
+ name = "failure_signal_handler_test",
+ srcs = ["failure_signal_handler_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = select({
+ "//absl:windows": [],
+ "//absl:wasm": [],
+ "//conditions:default": ["-pthread"],
+ }) + ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":failure_signal_handler",
+ ":stacktrace",
+ ":symbolize",
+ "//absl/base:raw_logging_internal",
+ "//absl/strings",
+ "@com_google_googletest//:gtest",
+ ],
+)
+
+cc_library(
+ name = "debugging_internal",
+ srcs = [
+ "internal/address_is_readable.cc",
+ "internal/elf_mem_image.cc",
+ "internal/vdso_support.cc",
+ ],
+ hdrs = [
+ "internal/address_is_readable.h",
+ "internal/elf_mem_image.h",
+ "internal/vdso_support.h",
+ ],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ "//absl/base:config",
+ "//absl/base:core_headers",
+ "//absl/base:dynamic_annotations",
+ "//absl/base:errno_saver",
+ "//absl/base:raw_logging_internal",
+ ],
+)
+
+cc_library(
+ name = "demangle_internal",
+ srcs = ["internal/demangle.cc"],
+ hdrs = ["internal/demangle.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ deps = [
+ "//absl/base",
+ "//absl/base:config",
+ "//absl/base:core_headers",
+ ],
+)
+
+cc_test(
+ name = "demangle_test",
+ srcs = ["internal/demangle_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":demangle_internal",
+ ":stack_consumption",
+ "//absl/base:config",
+ "//absl/base:core_headers",
+ "//absl/base:raw_logging_internal",
+ "//absl/memory",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_library(
+ name = "leak_check",
+ srcs = ["leak_check.cc"],
+ hdrs = ["leak_check.h"],
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ "//absl/base:config",
+ "//absl/base:core_headers",
+ ],
+)
+
+# Adding a dependency to leak_check_disable will disable
+# sanitizer leak checking (asan/lsan) in a test without
+# the need to mess around with build features.
+cc_library(
+ name = "leak_check_disable",
+ srcs = ["leak_check_disable.cc"],
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ linkstatic = 1,
+ deps = ["//absl/base:config"],
+ alwayslink = 1,
+)
+
+# These targets exists for use in tests only, explicitly configuring the
+# LEAK_SANITIZER macro. It must be linked with -fsanitize=leak for lsan.
+ABSL_LSAN_LINKOPTS = select({
+ "//absl:clang_compiler": ["-fsanitize=leak"],
+ "//conditions:default": [],
+})
+
+cc_library(
+ name = "leak_check_api_enabled_for_testing",
+ testonly = 1,
+ srcs = ["leak_check.cc"],
+ hdrs = ["leak_check.h"],
+ copts = select({
+ "//absl:clang_compiler": ["-DLEAK_SANITIZER"],
+ "//conditions:default": [],
+ }),
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ visibility = ["//visibility:private"],
+ deps = [
+ "//absl/base:config",
+ ],
+)
+
+cc_library(
+ name = "leak_check_api_disabled_for_testing",
+ testonly = 1,
+ srcs = ["leak_check.cc"],
+ hdrs = ["leak_check.h"],
+ copts = ["-ULEAK_SANITIZER"],
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ visibility = ["//visibility:private"],
+ deps = [
+ "//absl/base:config",
+ ],
+)
+
+cc_test(
+ name = "leak_check_test",
+ srcs = ["leak_check_test.cc"],
+ copts = select({
+ "//absl:clang_compiler": ["-DABSL_EXPECT_LEAK_SANITIZER"],
+ "//conditions:default": [],
+ }),
+ linkopts = ABSL_LSAN_LINKOPTS + ABSL_DEFAULT_LINKOPTS,
+ tags = ["notsan"],
+ deps = [
+ ":leak_check_api_enabled_for_testing",
+ "//absl/base",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "leak_check_no_lsan_test",
+ srcs = ["leak_check_test.cc"],
+ copts = ["-UABSL_EXPECT_LEAK_SANITIZER"],
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ tags = ["noasan"],
+ deps = [
+ ":leak_check_api_disabled_for_testing",
+ "//absl/base", # for raw_logging
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+# Test that leak checking is skipped when lsan is enabled but
+# ":leak_check_disable" is linked in.
+#
+# This test should fail in the absence of a dependency on ":leak_check_disable"
+cc_test(
+ name = "disabled_leak_check_test",
+ srcs = ["leak_check_fail_test.cc"],
+ linkopts = ABSL_LSAN_LINKOPTS + ABSL_DEFAULT_LINKOPTS,
+ tags = ["notsan"],
+ deps = [
+ ":leak_check_api_enabled_for_testing",
+ ":leak_check_disable",
+ "//absl/base",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_library(
+ name = "stack_consumption",
+ testonly = 1,
+ srcs = ["internal/stack_consumption.cc"],
+ hdrs = ["internal/stack_consumption.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ visibility = ["//visibility:private"],
+ deps = [
+ "//absl/base:config",
+ "//absl/base:core_headers",
+ "//absl/base:raw_logging_internal",
+ ],
+)
+
+cc_test(
+ name = "stack_consumption_test",
+ srcs = ["internal/stack_consumption_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":stack_consumption",
+ "//absl/base:core_headers",
+ "//absl/base:raw_logging_internal",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
diff --git a/third_party/abseil/src/absl/debugging/CMakeLists.txt b/third_party/abseil/src/absl/debugging/CMakeLists.txt
new file mode 100644
index 0000000..074b44c
--- /dev/null
+++ b/third_party/abseil/src/absl/debugging/CMakeLists.txt
@@ -0,0 +1,338 @@
+#
+# Copyright 2017 The Abseil Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+absl_cc_library(
+ NAME
+ stacktrace
+ HDRS
+ "stacktrace.h"
+ "internal/stacktrace_aarch64-inl.inc"
+ "internal/stacktrace_arm-inl.inc"
+ "internal/stacktrace_config.h"
+ "internal/stacktrace_generic-inl.inc"
+ "internal/stacktrace_powerpc-inl.inc"
+ "internal/stacktrace_unimplemented-inl.inc"
+ "internal/stacktrace_win32-inl.inc"
+ "internal/stacktrace_x86-inl.inc"
+ SRCS
+ "stacktrace.cc"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::debugging_internal
+ absl::config
+ absl::core_headers
+ PUBLIC
+)
+
+absl_cc_library(
+ NAME
+ symbolize
+ HDRS
+ "symbolize.h"
+ "internal/symbolize.h"
+ SRCS
+ "symbolize.cc"
+ "symbolize_darwin.inc"
+ "symbolize_elf.inc"
+ "symbolize_unimplemented.inc"
+ "symbolize_win32.inc"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ $<$<BOOL:${MINGW}>:"dbghelp">
+ DEPS
+ absl::debugging_internal
+ absl::demangle_internal
+ absl::base
+ absl::config
+ absl::core_headers
+ absl::dynamic_annotations
+ absl::malloc_internal
+ absl::raw_logging_internal
+ absl::strings
+ PUBLIC
+)
+
+absl_cc_test(
+ NAME
+ symbolize_test
+ SRCS
+ "symbolize_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ $<$<BOOL:${MSVC}>:-Z7>
+ LINKOPTS
+ $<$<BOOL:${MSVC}>:-DEBUG>
+ DEPS
+ absl::stack_consumption
+ absl::symbolize
+ absl::base
+ absl::config
+ absl::core_headers
+ absl::memory
+ absl::raw_logging_internal
+ absl::strings
+ gmock
+)
+
+absl_cc_library(
+ NAME
+ examine_stack
+ HDRS
+ "internal/examine_stack.h"
+ SRCS
+ "internal/examine_stack.cc"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::stacktrace
+ absl::symbolize
+ absl::config
+ absl::core_headers
+ absl::raw_logging_internal
+)
+
+absl_cc_library(
+ NAME
+ failure_signal_handler
+ HDRS
+ "failure_signal_handler.h"
+ SRCS
+ "failure_signal_handler.cc"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::examine_stack
+ absl::stacktrace
+ absl::base
+ absl::config
+ absl::core_headers
+ absl::errno_saver
+ absl::raw_logging_internal
+ PUBLIC
+)
+
+absl_cc_test(
+ NAME
+ failure_signal_handler_test
+ SRCS
+ "failure_signal_handler_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::failure_signal_handler
+ absl::stacktrace
+ absl::symbolize
+ absl::strings
+ absl::raw_logging_internal
+ Threads::Threads
+ gmock
+)
+
+absl_cc_library(
+ NAME
+ debugging_internal
+ HDRS
+ "internal/address_is_readable.h"
+ "internal/elf_mem_image.h"
+ "internal/vdso_support.h"
+ SRCS
+ "internal/address_is_readable.cc"
+ "internal/elf_mem_image.cc"
+ "internal/vdso_support.cc"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::core_headers
+ absl::config
+ absl::dynamic_annotations
+ absl::errno_saver
+ absl::raw_logging_internal
+)
+
+absl_cc_library(
+ NAME
+ demangle_internal
+ HDRS
+ "internal/demangle.h"
+ SRCS
+ "internal/demangle.cc"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::base
+ absl::core_headers
+ PUBLIC
+)
+
+absl_cc_test(
+ NAME
+ demangle_test
+ SRCS
+ "internal/demangle_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::demangle_internal
+ absl::stack_consumption
+ absl::config
+ absl::core_headers
+ absl::memory
+ absl::raw_logging_internal
+ gmock_main
+)
+
+absl_cc_library(
+ NAME
+ leak_check
+ HDRS
+ "leak_check.h"
+ SRCS
+ "leak_check.cc"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::config
+ absl::core_headers
+ PUBLIC
+)
+
+absl_cc_library(
+ NAME
+ leak_check_disable
+ SRCS
+ "leak_check_disable.cc"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ PUBLIC
+)
+
+absl_cc_library(
+ NAME
+ leak_check_api_enabled_for_testing
+ HDRS
+ "leak_check.h"
+ SRCS
+ "leak_check.cc"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ $<$<BOOL:${ABSL_HAVE_LSAN}>:-DLEAK_SANITIZER>
+ TESTONLY
+)
+
+absl_cc_library(
+ NAME
+ leak_check_api_disabled_for_testing
+ HDRS
+ "leak_check.h"
+ SRCS
+ "leak_check.cc"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ "-ULEAK_SANITIZER"
+ TESTONLY
+)
+
+absl_cc_test(
+ NAME
+ leak_check_test
+ SRCS
+ "leak_check_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ "$<$<BOOL:${ABSL_HAVE_LSAN}>:-DABSL_EXPECT_LEAK_SANITIZER>"
+ LINKOPTS
+ "${ABSL_LSAN_LINKOPTS}"
+ DEPS
+ absl::leak_check_api_enabled_for_testing
+ absl::base
+ gmock_main
+)
+
+absl_cc_test(
+ NAME
+ leak_check_no_lsan_test
+ SRCS
+ "leak_check_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ "-UABSL_EXPECT_LEAK_SANITIZER"
+ DEPS
+ absl::leak_check_api_disabled_for_testing
+ absl::base
+ gmock_main
+)
+
+absl_cc_test(
+ NAME
+ disabled_leak_check_test
+ SRCS
+ "leak_check_fail_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ LINKOPTS
+ "${ABSL_LSAN_LINKOPTS}"
+ DEPS
+ absl::leak_check_api_enabled_for_testing
+ absl::leak_check_disable
+ absl::base
+ absl::raw_logging_internal
+ gmock_main
+)
+
+absl_cc_library(
+ NAME
+ stack_consumption
+ HDRS
+ "internal/stack_consumption.h"
+ SRCS
+ "internal/stack_consumption.cc"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::config
+ absl::core_headers
+ absl::raw_logging_internal
+ TESTONLY
+)
+
+absl_cc_test(
+ NAME
+ stack_consumption_test
+ SRCS
+ "internal/stack_consumption_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::stack_consumption
+ absl::core_headers
+ absl::raw_logging_internal
+ gmock_main
+)
+
+# component target
+absl_cc_library(
+ NAME
+ debugging
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::stacktrace
+ absl::leak_check
+ PUBLIC
+)
diff --git a/third_party/abseil/src/absl/debugging/failure_signal_handler.cc b/third_party/abseil/src/absl/debugging/failure_signal_handler.cc
new file mode 100644
index 0000000..5d13bdb
--- /dev/null
+++ b/third_party/abseil/src/absl/debugging/failure_signal_handler.cc
@@ -0,0 +1,370 @@
+//
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+#include "absl/debugging/failure_signal_handler.h"
+
+#include "absl/base/config.h"
+
+#ifdef _WIN32
+#include <windows.h>
+#else
+#include <unistd.h>
+#endif
+
+#ifdef __APPLE__
+#include <TargetConditionals.h>
+#endif
+
+#ifdef ABSL_HAVE_MMAP
+#include <sys/mman.h>
+#endif
+
+#include <algorithm>
+#include <atomic>
+#include <cerrno>
+#include <csignal>
+#include <cstdio>
+#include <cstring>
+#include <ctime>
+
+#include "absl/base/attributes.h"
+#include "absl/base/internal/errno_saver.h"
+#include "absl/base/internal/raw_logging.h"
+#include "absl/base/internal/sysinfo.h"
+#include "absl/debugging/internal/examine_stack.h"
+#include "absl/debugging/stacktrace.h"
+
+#ifndef _WIN32
+#define ABSL_HAVE_SIGACTION
+// Apple WatchOS and TVOS don't allow sigaltstack
+#if !(defined(TARGET_OS_WATCH) && TARGET_OS_WATCH) && \
+ !(defined(TARGET_OS_TV) && TARGET_OS_TV)
+#define ABSL_HAVE_SIGALTSTACK
+#endif
+#endif
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+ABSL_CONST_INIT static FailureSignalHandlerOptions fsh_options;
+
+// Resets the signal handler for signo to the default action for that
+// signal, then raises the signal.
+static void RaiseToDefaultHandler(int signo) {
+ signal(signo, SIG_DFL);
+ raise(signo);
+}
+
+struct FailureSignalData {
+ const int signo;
+ const char* const as_string;
+#ifdef ABSL_HAVE_SIGACTION
+ struct sigaction previous_action;
+ // StructSigaction is used to silence -Wmissing-field-initializers.
+ using StructSigaction = struct sigaction;
+ #define FSD_PREVIOUS_INIT FailureSignalData::StructSigaction()
+#else
+ void (*previous_handler)(int);
+ #define FSD_PREVIOUS_INIT SIG_DFL
+#endif
+};
+
+ABSL_CONST_INIT static FailureSignalData failure_signal_data[] = {
+ {SIGSEGV, "SIGSEGV", FSD_PREVIOUS_INIT},
+ {SIGILL, "SIGILL", FSD_PREVIOUS_INIT},
+ {SIGFPE, "SIGFPE", FSD_PREVIOUS_INIT},
+ {SIGABRT, "SIGABRT", FSD_PREVIOUS_INIT},
+ {SIGTERM, "SIGTERM", FSD_PREVIOUS_INIT},
+#ifndef _WIN32
+ {SIGBUS, "SIGBUS", FSD_PREVIOUS_INIT},
+ {SIGTRAP, "SIGTRAP", FSD_PREVIOUS_INIT},
+#endif
+};
+
+#undef FSD_PREVIOUS_INIT
+
+static void RaiseToPreviousHandler(int signo) {
+ // Search for the previous handler.
+ for (const auto& it : failure_signal_data) {
+ if (it.signo == signo) {
+#ifdef ABSL_HAVE_SIGACTION
+ sigaction(signo, &it.previous_action, nullptr);
+#else
+ signal(signo, it.previous_handler);
+#endif
+ raise(signo);
+ return;
+ }
+ }
+
+ // Not found, use the default handler.
+ RaiseToDefaultHandler(signo);
+}
+
+namespace debugging_internal {
+
+const char* FailureSignalToString(int signo) {
+ for (const auto& it : failure_signal_data) {
+ if (it.signo == signo) {
+ return it.as_string;
+ }
+ }
+ return "";
+}
+
+} // namespace debugging_internal
+
+#ifdef ABSL_HAVE_SIGALTSTACK
+
+static bool SetupAlternateStackOnce() {
+#if defined(__wasm__) || defined (__asjms__)
+ const size_t page_mask = getpagesize() - 1;
+#else
+ const size_t page_mask = sysconf(_SC_PAGESIZE) - 1;
+#endif
+ size_t stack_size = (std::max(SIGSTKSZ, 65536) + page_mask) & ~page_mask;
+#if defined(ABSL_HAVE_ADDRESS_SANITIZER) || \
+ defined(ABSL_HAVE_MEMORY_SANITIZER) || defined(ABSL_HAVE_THREAD_SANITIZER)
+ // Account for sanitizer instrumentation requiring additional stack space.
+ stack_size *= 5;
+#endif
+
+ stack_t sigstk;
+ memset(&sigstk, 0, sizeof(sigstk));
+ sigstk.ss_size = stack_size;
+
+#ifdef ABSL_HAVE_MMAP
+#ifndef MAP_STACK
+#define MAP_STACK 0
+#endif
+#if defined(MAP_ANON) && !defined(MAP_ANONYMOUS)
+#define MAP_ANONYMOUS MAP_ANON
+#endif
+ sigstk.ss_sp = mmap(nullptr, sigstk.ss_size, PROT_READ | PROT_WRITE,
+ MAP_PRIVATE | MAP_ANONYMOUS | MAP_STACK, -1, 0);
+ if (sigstk.ss_sp == MAP_FAILED) {
+ ABSL_RAW_LOG(FATAL, "mmap() for alternate signal stack failed");
+ }
+#else
+ sigstk.ss_sp = malloc(sigstk.ss_size);
+ if (sigstk.ss_sp == nullptr) {
+ ABSL_RAW_LOG(FATAL, "malloc() for alternate signal stack failed");
+ }
+#endif
+
+ if (sigaltstack(&sigstk, nullptr) != 0) {
+ ABSL_RAW_LOG(FATAL, "sigaltstack() failed with errno=%d", errno);
+ }
+ return true;
+}
+
+#endif
+
+#ifdef ABSL_HAVE_SIGACTION
+
+// Sets up an alternate stack for signal handlers once.
+// Returns the appropriate flag for sig_action.sa_flags
+// if the system supports using an alternate stack.
+static int MaybeSetupAlternateStack() {
+#ifdef ABSL_HAVE_SIGALTSTACK
+ ABSL_ATTRIBUTE_UNUSED static const bool kOnce = SetupAlternateStackOnce();
+ return SA_ONSTACK;
+#else
+ return 0;
+#endif
+}
+
+static void InstallOneFailureHandler(FailureSignalData* data,
+ void (*handler)(int, siginfo_t*, void*)) {
+ struct sigaction act;
+ memset(&act, 0, sizeof(act));
+ sigemptyset(&act.sa_mask);
+ act.sa_flags |= SA_SIGINFO;
+ // SA_NODEFER is required to handle SIGABRT from
+ // ImmediateAbortSignalHandler().
+ act.sa_flags |= SA_NODEFER;
+ if (fsh_options.use_alternate_stack) {
+ act.sa_flags |= MaybeSetupAlternateStack();
+ }
+ act.sa_sigaction = handler;
+ ABSL_RAW_CHECK(sigaction(data->signo, &act, &data->previous_action) == 0,
+ "sigaction() failed");
+}
+
+#else
+
+static void InstallOneFailureHandler(FailureSignalData* data,
+ void (*handler)(int)) {
+ data->previous_handler = signal(data->signo, handler);
+ ABSL_RAW_CHECK(data->previous_handler != SIG_ERR, "signal() failed");
+}
+
+#endif
+
+static void WriteToStderr(const char* data) {
+ absl::base_internal::ErrnoSaver errno_saver;
+ absl::raw_logging_internal::SafeWriteToStderr(data, strlen(data));
+}
+
+static void WriteSignalMessage(int signo, void (*writerfn)(const char*)) {
+ char buf[64];
+ const char* const signal_string =
+ debugging_internal::FailureSignalToString(signo);
+ if (signal_string != nullptr && signal_string[0] != '\0') {
+ snprintf(buf, sizeof(buf), "*** %s received at time=%ld ***\n",
+ signal_string,
+ static_cast<long>(time(nullptr))); // NOLINT(runtime/int)
+ } else {
+ snprintf(buf, sizeof(buf), "*** Signal %d received at time=%ld ***\n",
+ signo, static_cast<long>(time(nullptr))); // NOLINT(runtime/int)
+ }
+ writerfn(buf);
+}
+
+// `void*` might not be big enough to store `void(*)(const char*)`.
+struct WriterFnStruct {
+ void (*writerfn)(const char*);
+};
+
+// Many of the absl::debugging_internal::Dump* functions in
+// examine_stack.h take a writer function pointer that has a void* arg
+// for historical reasons. failure_signal_handler_writer only takes a
+// data pointer. This function converts between these types.
+static void WriterFnWrapper(const char* data, void* arg) {
+ static_cast<WriterFnStruct*>(arg)->writerfn(data);
+}
+
+// Convenient wrapper around DumpPCAndFrameSizesAndStackTrace() for signal
+// handlers. "noinline" so that GetStackFrames() skips the top-most stack
+// frame for this function.
+ABSL_ATTRIBUTE_NOINLINE static void WriteStackTrace(
+ void* ucontext, bool symbolize_stacktrace,
+ void (*writerfn)(const char*, void*), void* writerfn_arg) {
+ constexpr int kNumStackFrames = 32;
+ void* stack[kNumStackFrames];
+ int frame_sizes[kNumStackFrames];
+ int min_dropped_frames;
+ int depth = absl::GetStackFramesWithContext(
+ stack, frame_sizes, kNumStackFrames,
+ 1, // Do not include this function in stack trace.
+ ucontext, &min_dropped_frames);
+ absl::debugging_internal::DumpPCAndFrameSizesAndStackTrace(
+ absl::debugging_internal::GetProgramCounter(ucontext), stack, frame_sizes,
+ depth, min_dropped_frames, symbolize_stacktrace, writerfn, writerfn_arg);
+}
+
+// Called by AbslFailureSignalHandler() to write the failure info. It is
+// called once with writerfn set to WriteToStderr() and then possibly
+// with writerfn set to the user provided function.
+static void WriteFailureInfo(int signo, void* ucontext,
+ void (*writerfn)(const char*)) {
+ WriterFnStruct writerfn_struct{writerfn};
+ WriteSignalMessage(signo, writerfn);
+ WriteStackTrace(ucontext, fsh_options.symbolize_stacktrace, WriterFnWrapper,
+ &writerfn_struct);
+}
+
+// absl::SleepFor() can't be used here since AbslInternalSleepFor()
+// may be overridden to do something that isn't async-signal-safe on
+// some platforms.
+static void PortableSleepForSeconds(int seconds) {
+#ifdef _WIN32
+ Sleep(seconds * 1000);
+#else
+ struct timespec sleep_time;
+ sleep_time.tv_sec = seconds;
+ sleep_time.tv_nsec = 0;
+ while (nanosleep(&sleep_time, &sleep_time) != 0 && errno == EINTR) {}
+#endif
+}
+
+#ifdef ABSL_HAVE_ALARM
+// AbslFailureSignalHandler() installs this as a signal handler for
+// SIGALRM, then sets an alarm to be delivered to the program after a
+// set amount of time. If AbslFailureSignalHandler() hangs for more than
+// the alarm timeout, ImmediateAbortSignalHandler() will abort the
+// program.
+static void ImmediateAbortSignalHandler(int) {
+ RaiseToDefaultHandler(SIGABRT);
+}
+#endif
+
+// absl::base_internal::GetTID() returns pid_t on most platforms, but
+// returns absl::base_internal::pid_t on Windows.
+using GetTidType = decltype(absl::base_internal::GetTID());
+ABSL_CONST_INIT static std::atomic<GetTidType> failed_tid(0);
+
+#ifndef ABSL_HAVE_SIGACTION
+static void AbslFailureSignalHandler(int signo) {
+ void* ucontext = nullptr;
+#else
+static void AbslFailureSignalHandler(int signo, siginfo_t*, void* ucontext) {
+#endif
+
+ const GetTidType this_tid = absl::base_internal::GetTID();
+ GetTidType previous_failed_tid = 0;
+ if (!failed_tid.compare_exchange_strong(
+ previous_failed_tid, static_cast<intptr_t>(this_tid),
+ std::memory_order_acq_rel, std::memory_order_relaxed)) {
+ ABSL_RAW_LOG(
+ ERROR,
+ "Signal %d raised at PC=%p while already in AbslFailureSignalHandler()",
+ signo, absl::debugging_internal::GetProgramCounter(ucontext));
+ if (this_tid != previous_failed_tid) {
+ // Another thread is already in AbslFailureSignalHandler(), so wait
+ // a bit for it to finish. If the other thread doesn't kill us,
+ // we do so after sleeping.
+ PortableSleepForSeconds(3);
+ RaiseToDefaultHandler(signo);
+ // The recursively raised signal may be blocked until we return.
+ return;
+ }
+ }
+
+#ifdef ABSL_HAVE_ALARM
+ // Set an alarm to abort the program in case this code hangs or deadlocks.
+ if (fsh_options.alarm_on_failure_secs > 0) {
+ alarm(0); // Cancel any existing alarms.
+ signal(SIGALRM, ImmediateAbortSignalHandler);
+ alarm(fsh_options.alarm_on_failure_secs);
+ }
+#endif
+
+ // First write to stderr.
+ WriteFailureInfo(signo, ucontext, WriteToStderr);
+
+ // Riskier code (because it is less likely to be async-signal-safe)
+ // goes after this point.
+ if (fsh_options.writerfn != nullptr) {
+ WriteFailureInfo(signo, ucontext, fsh_options.writerfn);
+ }
+
+ if (fsh_options.call_previous_handler) {
+ RaiseToPreviousHandler(signo);
+ } else {
+ RaiseToDefaultHandler(signo);
+ }
+}
+
+void InstallFailureSignalHandler(const FailureSignalHandlerOptions& options) {
+ fsh_options = options;
+ for (auto& it : failure_signal_data) {
+ InstallOneFailureHandler(&it, AbslFailureSignalHandler);
+ }
+}
+
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/debugging/failure_signal_handler.h b/third_party/abseil/src/absl/debugging/failure_signal_handler.h
new file mode 100644
index 0000000..0c0f585
--- /dev/null
+++ b/third_party/abseil/src/absl/debugging/failure_signal_handler.h
@@ -0,0 +1,121 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: failure_signal_handler.h
+// -----------------------------------------------------------------------------
+//
+// This file configures the Abseil *failure signal handler* to capture and dump
+// useful debugging information (such as a stacktrace) upon program failure.
+//
+// To use the failure signal handler, call `absl::InstallFailureSignalHandler()`
+// very early in your program, usually in the first few lines of main():
+//
+// int main(int argc, char** argv) {
+// // Initialize the symbolizer to get a human-readable stack trace
+// absl::InitializeSymbolizer(argv[0]);
+//
+// absl::FailureSignalHandlerOptions options;
+// absl::InstallFailureSignalHandler(options);
+// DoSomethingInteresting();
+// return 0;
+// }
+//
+// Any program that raises a fatal signal (such as `SIGSEGV`, `SIGILL`,
+// `SIGFPE`, `SIGABRT`, `SIGTERM`, `SIGBUG`, and `SIGTRAP`) will call the
+// installed failure signal handler and provide debugging information to stderr.
+//
+// Note that you should *not* install the Abseil failure signal handler more
+// than once. You may, of course, have another (non-Abseil) failure signal
+// handler installed (which would be triggered if Abseil's failure signal
+// handler sets `call_previous_handler` to `true`).
+
+#ifndef ABSL_DEBUGGING_FAILURE_SIGNAL_HANDLER_H_
+#define ABSL_DEBUGGING_FAILURE_SIGNAL_HANDLER_H_
+
+#include "absl/base/config.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+// FailureSignalHandlerOptions
+//
+// Struct for holding `absl::InstallFailureSignalHandler()` configuration
+// options.
+struct FailureSignalHandlerOptions {
+ // If true, try to symbolize the stacktrace emitted on failure, provided that
+ // you have initialized a symbolizer for that purpose. (See symbolize.h for
+ // more information.)
+ bool symbolize_stacktrace = true;
+
+ // If true, try to run signal handlers on an alternate stack (if supported on
+ // the given platform). An alternate stack is useful for program crashes due
+ // to a stack overflow; by running on a alternate stack, the signal handler
+ // may run even when normal stack space has been exausted. The downside of
+ // using an alternate stack is that extra memory for the alternate stack needs
+ // to be pre-allocated.
+ bool use_alternate_stack = true;
+
+ // If positive, indicates the number of seconds after which the failure signal
+ // handler is invoked to abort the program. Setting such an alarm is useful in
+ // cases where the failure signal handler itself may become hung or
+ // deadlocked.
+ int alarm_on_failure_secs = 3;
+
+ // If true, call the previously registered signal handler for the signal that
+ // was received (if one was registered) after the existing signal handler
+ // runs. This mechanism can be used to chain signal handlers together.
+ //
+ // If false, the signal is raised to the default handler for that signal
+ // (which normally terminates the program).
+ //
+ // IMPORTANT: If true, the chained fatal signal handlers must not try to
+ // recover from the fatal signal. Instead, they should terminate the program
+ // via some mechanism, like raising the default handler for the signal, or by
+ // calling `_exit()`. Note that the failure signal handler may put parts of
+ // the Abseil library into a state from which they cannot recover.
+ bool call_previous_handler = false;
+
+ // If non-null, indicates a pointer to a callback function that will be called
+ // upon failure, with a string argument containing failure data. This function
+ // may be used as a hook to write failure data to a secondary location, such
+ // as a log file. This function may also be called with null data, as a hint
+ // to flush any buffered data before the program may be terminated. Consider
+ // flushing any buffered data in all calls to this function.
+ //
+ // Since this function runs within a signal handler, it should be
+ // async-signal-safe if possible.
+ // See http://man7.org/linux/man-pages/man7/signal-safety.7.html
+ void (*writerfn)(const char*) = nullptr;
+};
+
+// InstallFailureSignalHandler()
+//
+// Installs a signal handler for the common failure signals `SIGSEGV`, `SIGILL`,
+// `SIGFPE`, `SIGABRT`, `SIGTERM`, `SIGBUG`, and `SIGTRAP` (provided they exist
+// on the given platform). The failure signal handler dumps program failure data
+// useful for debugging in an unspecified format to stderr. This data may
+// include the program counter, a stacktrace, and register information on some
+// systems; do not rely on an exact format for the output, as it is subject to
+// change.
+void InstallFailureSignalHandler(const FailureSignalHandlerOptions& options);
+
+namespace debugging_internal {
+const char* FailureSignalToString(int signo);
+} // namespace debugging_internal
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_DEBUGGING_FAILURE_SIGNAL_HANDLER_H_
diff --git a/third_party/abseil/src/absl/debugging/failure_signal_handler_test.cc b/third_party/abseil/src/absl/debugging/failure_signal_handler_test.cc
new file mode 100644
index 0000000..d8283b2
--- /dev/null
+++ b/third_party/abseil/src/absl/debugging/failure_signal_handler_test.cc
@@ -0,0 +1,159 @@
+//
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+#include "absl/debugging/failure_signal_handler.h"
+
+#include <csignal>
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+#include <fstream>
+
+#include "gtest/gtest.h"
+#include "gmock/gmock.h"
+#include "absl/base/internal/raw_logging.h"
+#include "absl/debugging/stacktrace.h"
+#include "absl/debugging/symbolize.h"
+#include "absl/strings/match.h"
+#include "absl/strings/str_cat.h"
+
+namespace {
+
+using testing::StartsWith;
+
+#if GTEST_HAS_DEATH_TEST
+
+// For the parameterized death tests. GetParam() returns the signal number.
+using FailureSignalHandlerDeathTest = ::testing::TestWithParam<int>;
+
+// This function runs in a fork()ed process on most systems.
+void InstallHandlerAndRaise(int signo) {
+ absl::InstallFailureSignalHandler(absl::FailureSignalHandlerOptions());
+ raise(signo);
+}
+
+TEST_P(FailureSignalHandlerDeathTest, AbslFailureSignal) {
+ const int signo = GetParam();
+ std::string exit_regex = absl::StrCat(
+ "\\*\\*\\* ", absl::debugging_internal::FailureSignalToString(signo),
+ " received at time=");
+#ifndef _WIN32
+ EXPECT_EXIT(InstallHandlerAndRaise(signo), testing::KilledBySignal(signo),
+ exit_regex);
+#else
+ // Windows doesn't have testing::KilledBySignal().
+ EXPECT_DEATH_IF_SUPPORTED(InstallHandlerAndRaise(signo), exit_regex);
+#endif
+}
+
+ABSL_CONST_INIT FILE* error_file = nullptr;
+
+void WriteToErrorFile(const char* msg) {
+ if (msg != nullptr) {
+ ABSL_RAW_CHECK(fwrite(msg, strlen(msg), 1, error_file) == 1,
+ "fwrite() failed");
+ }
+ ABSL_RAW_CHECK(fflush(error_file) == 0, "fflush() failed");
+}
+
+std::string GetTmpDir() {
+ // TEST_TMPDIR is set by Bazel. Try the others when not running under Bazel.
+ static const char* const kTmpEnvVars[] = {"TEST_TMPDIR", "TMPDIR", "TEMP",
+ "TEMPDIR", "TMP"};
+ for (const char* const var : kTmpEnvVars) {
+ const char* tmp_dir = std::getenv(var);
+ if (tmp_dir != nullptr) {
+ return tmp_dir;
+ }
+ }
+
+ // Try something reasonable.
+ return "/tmp";
+}
+
+// This function runs in a fork()ed process on most systems.
+void InstallHandlerWithWriteToFileAndRaise(const char* file, int signo) {
+ error_file = fopen(file, "w");
+ ABSL_RAW_CHECK(error_file != nullptr, "Failed create error_file");
+ absl::FailureSignalHandlerOptions options;
+ options.writerfn = WriteToErrorFile;
+ absl::InstallFailureSignalHandler(options);
+ raise(signo);
+}
+
+TEST_P(FailureSignalHandlerDeathTest, AbslFatalSignalsWithWriterFn) {
+ const int signo = GetParam();
+ std::string tmp_dir = GetTmpDir();
+ std::string file = absl::StrCat(tmp_dir, "/signo_", signo);
+
+ std::string exit_regex = absl::StrCat(
+ "\\*\\*\\* ", absl::debugging_internal::FailureSignalToString(signo),
+ " received at time=");
+#ifndef _WIN32
+ EXPECT_EXIT(InstallHandlerWithWriteToFileAndRaise(file.c_str(), signo),
+ testing::KilledBySignal(signo), exit_regex);
+#else
+ // Windows doesn't have testing::KilledBySignal().
+ EXPECT_DEATH_IF_SUPPORTED(
+ InstallHandlerWithWriteToFileAndRaise(file.c_str(), signo), exit_regex);
+#endif
+
+ // Open the file in this process and check its contents.
+ std::fstream error_output(file);
+ ASSERT_TRUE(error_output.is_open()) << file;
+ std::string error_line;
+ std::getline(error_output, error_line);
+ EXPECT_THAT(
+ error_line,
+ StartsWith(absl::StrCat(
+ "*** ", absl::debugging_internal::FailureSignalToString(signo),
+ " received at ")));
+
+ if (absl::debugging_internal::StackTraceWorksForTest()) {
+ std::getline(error_output, error_line);
+ EXPECT_THAT(error_line, StartsWith("PC: "));
+ }
+}
+
+constexpr int kFailureSignals[] = {
+ SIGSEGV, SIGILL, SIGFPE, SIGABRT, SIGTERM,
+#ifndef _WIN32
+ SIGBUS, SIGTRAP,
+#endif
+};
+
+std::string SignalParamToString(const ::testing::TestParamInfo<int>& info) {
+ std::string result =
+ absl::debugging_internal::FailureSignalToString(info.param);
+ if (result.empty()) {
+ result = absl::StrCat(info.param);
+ }
+ return result;
+}
+
+INSTANTIATE_TEST_SUITE_P(AbslDeathTest, FailureSignalHandlerDeathTest,
+ ::testing::ValuesIn(kFailureSignals),
+ SignalParamToString);
+
+#endif // GTEST_HAS_DEATH_TEST
+
+} // namespace
+
+int main(int argc, char** argv) {
+ absl::InitializeSymbolizer(argv[0]);
+ testing::InitGoogleTest(&argc, argv);
+ return RUN_ALL_TESTS();
+}
diff --git a/third_party/abseil/src/absl/debugging/internal/address_is_readable.cc b/third_party/abseil/src/absl/debugging/internal/address_is_readable.cc
new file mode 100644
index 0000000..329c285
--- /dev/null
+++ b/third_party/abseil/src/absl/debugging/internal/address_is_readable.cc
@@ -0,0 +1,139 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// base::AddressIsReadable() probes an address to see whether it is readable,
+// without faulting.
+
+#include "absl/debugging/internal/address_is_readable.h"
+
+#if !defined(__linux__) || defined(__ANDROID__)
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace debugging_internal {
+
+// On platforms other than Linux, just return true.
+bool AddressIsReadable(const void* /* addr */) { return true; }
+
+} // namespace debugging_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#else
+
+#include <fcntl.h>
+#include <sys/syscall.h>
+#include <unistd.h>
+
+#include <atomic>
+#include <cerrno>
+#include <cstdint>
+
+#include "absl/base/internal/errno_saver.h"
+#include "absl/base/internal/raw_logging.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace debugging_internal {
+
+// Pack a pid and two file descriptors into a 64-bit word,
+// using 16, 24, and 24 bits for each respectively.
+static uint64_t Pack(uint64_t pid, uint64_t read_fd, uint64_t write_fd) {
+ ABSL_RAW_CHECK((read_fd >> 24) == 0 && (write_fd >> 24) == 0,
+ "fd out of range");
+ return (pid << 48) | ((read_fd & 0xffffff) << 24) | (write_fd & 0xffffff);
+}
+
+// Unpack x into a pid and two file descriptors, where x was created with
+// Pack().
+static void Unpack(uint64_t x, int *pid, int *read_fd, int *write_fd) {
+ *pid = x >> 48;
+ *read_fd = (x >> 24) & 0xffffff;
+ *write_fd = x & 0xffffff;
+}
+
+// Return whether the byte at *addr is readable, without faulting.
+// Save and restores errno. Returns true on systems where
+// unimplemented.
+// This is a namespace-scoped variable for correct zero-initialization.
+static std::atomic<uint64_t> pid_and_fds; // initially 0, an invalid pid.
+
+bool AddressIsReadable(const void *addr) {
+ absl::base_internal::ErrnoSaver errno_saver;
+ // We test whether a byte is readable by using write(). Normally, this would
+ // be done via a cached file descriptor to /dev/null, but linux fails to
+ // check whether the byte is readable when the destination is /dev/null, so
+ // we use a cached pipe. We store the pid of the process that created the
+ // pipe to handle the case where a process forks, and the child closes all
+ // the file descriptors and then calls this routine. This is not perfect:
+ // the child could use the routine, then close all file descriptors and then
+ // use this routine again. But the likely use of this routine is when
+ // crashing, to test the validity of pages when dumping the stack. Beware
+ // that we may leak file descriptors, but we're unlikely to leak many.
+ int bytes_written;
+ int current_pid = getpid() & 0xffff; // we use only the low order 16 bits
+ do { // until we do not get EBADF trying to use file descriptors
+ int pid;
+ int read_fd;
+ int write_fd;
+ uint64_t local_pid_and_fds = pid_and_fds.load(std::memory_order_acquire);
+ Unpack(local_pid_and_fds, &pid, &read_fd, &write_fd);
+ while (current_pid != pid) {
+ int p[2];
+ // new pipe
+ if (pipe(p) != 0) {
+ ABSL_RAW_LOG(FATAL, "Failed to create pipe, errno=%d", errno);
+ }
+ fcntl(p[0], F_SETFD, FD_CLOEXEC);
+ fcntl(p[1], F_SETFD, FD_CLOEXEC);
+ uint64_t new_pid_and_fds = Pack(current_pid, p[0], p[1]);
+ if (pid_and_fds.compare_exchange_strong(
+ local_pid_and_fds, new_pid_and_fds, std::memory_order_release,
+ std::memory_order_relaxed)) {
+ local_pid_and_fds = new_pid_and_fds; // fds exposed to other threads
+ } else { // fds not exposed to other threads; we can close them.
+ close(p[0]);
+ close(p[1]);
+ local_pid_and_fds = pid_and_fds.load(std::memory_order_acquire);
+ }
+ Unpack(local_pid_and_fds, &pid, &read_fd, &write_fd);
+ }
+ errno = 0;
+ // Use syscall(SYS_write, ...) instead of write() to prevent ASAN
+ // and other checkers from complaining about accesses to arbitrary
+ // memory.
+ do {
+ bytes_written = syscall(SYS_write, write_fd, addr, 1);
+ } while (bytes_written == -1 && errno == EINTR);
+ if (bytes_written == 1) { // remove the byte from the pipe
+ char c;
+ while (read(read_fd, &c, 1) == -1 && errno == EINTR) {
+ }
+ }
+ if (errno == EBADF) { // Descriptors invalid.
+ // If pid_and_fds contains the problematic file descriptors we just used,
+ // this call will forget them, and the loop will try again.
+ pid_and_fds.compare_exchange_strong(local_pid_and_fds, 0,
+ std::memory_order_release,
+ std::memory_order_relaxed);
+ }
+ } while (errno == EBADF);
+ return bytes_written == 1;
+}
+
+} // namespace debugging_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif
diff --git a/third_party/abseil/src/absl/debugging/internal/address_is_readable.h b/third_party/abseil/src/absl/debugging/internal/address_is_readable.h
new file mode 100644
index 0000000..4bbaf4d
--- /dev/null
+++ b/third_party/abseil/src/absl/debugging/internal/address_is_readable.h
@@ -0,0 +1,32 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_DEBUGGING_INTERNAL_ADDRESS_IS_READABLE_H_
+#define ABSL_DEBUGGING_INTERNAL_ADDRESS_IS_READABLE_H_
+
+#include "absl/base/config.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace debugging_internal {
+
+// Return whether the byte at *addr is readable, without faulting.
+// Save and restores errno.
+bool AddressIsReadable(const void *addr);
+
+} // namespace debugging_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_DEBUGGING_INTERNAL_ADDRESS_IS_READABLE_H_
diff --git a/third_party/abseil/src/absl/debugging/internal/demangle.cc b/third_party/abseil/src/absl/debugging/internal/demangle.cc
new file mode 100644
index 0000000..46cdb67
--- /dev/null
+++ b/third_party/abseil/src/absl/debugging/internal/demangle.cc
@@ -0,0 +1,1945 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// For reference check out:
+// https://itanium-cxx-abi.github.io/cxx-abi/abi.html#mangling
+//
+// Note that we only have partial C++11 support yet.
+
+#include "absl/debugging/internal/demangle.h"
+
+#include <cstdint>
+#include <cstdio>
+#include <limits>
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace debugging_internal {
+
+typedef struct {
+ const char *abbrev;
+ const char *real_name;
+ // Number of arguments in <expression> context, or 0 if disallowed.
+ int arity;
+} AbbrevPair;
+
+// List of operators from Itanium C++ ABI.
+static const AbbrevPair kOperatorList[] = {
+ // New has special syntax (not currently supported).
+ {"nw", "new", 0},
+ {"na", "new[]", 0},
+
+ // Works except that the 'gs' prefix is not supported.
+ {"dl", "delete", 1},
+ {"da", "delete[]", 1},
+
+ {"ps", "+", 1}, // "positive"
+ {"ng", "-", 1}, // "negative"
+ {"ad", "&", 1}, // "address-of"
+ {"de", "*", 1}, // "dereference"
+ {"co", "~", 1},
+
+ {"pl", "+", 2},
+ {"mi", "-", 2},
+ {"ml", "*", 2},
+ {"dv", "/", 2},
+ {"rm", "%", 2},
+ {"an", "&", 2},
+ {"or", "|", 2},
+ {"eo", "^", 2},
+ {"aS", "=", 2},
+ {"pL", "+=", 2},
+ {"mI", "-=", 2},
+ {"mL", "*=", 2},
+ {"dV", "/=", 2},
+ {"rM", "%=", 2},
+ {"aN", "&=", 2},
+ {"oR", "|=", 2},
+ {"eO", "^=", 2},
+ {"ls", "<<", 2},
+ {"rs", ">>", 2},
+ {"lS", "<<=", 2},
+ {"rS", ">>=", 2},
+ {"eq", "==", 2},
+ {"ne", "!=", 2},
+ {"lt", "<", 2},
+ {"gt", ">", 2},
+ {"le", "<=", 2},
+ {"ge", ">=", 2},
+ {"nt", "!", 1},
+ {"aa", "&&", 2},
+ {"oo", "||", 2},
+ {"pp", "++", 1},
+ {"mm", "--", 1},
+ {"cm", ",", 2},
+ {"pm", "->*", 2},
+ {"pt", "->", 0}, // Special syntax
+ {"cl", "()", 0}, // Special syntax
+ {"ix", "[]", 2},
+ {"qu", "?", 3},
+ {"st", "sizeof", 0}, // Special syntax
+ {"sz", "sizeof", 1}, // Not a real operator name, but used in expressions.
+ {nullptr, nullptr, 0},
+};
+
+// List of builtin types from Itanium C++ ABI.
+//
+// Invariant: only one- or two-character type abbreviations here.
+static const AbbrevPair kBuiltinTypeList[] = {
+ {"v", "void", 0},
+ {"w", "wchar_t", 0},
+ {"b", "bool", 0},
+ {"c", "char", 0},
+ {"a", "signed char", 0},
+ {"h", "unsigned char", 0},
+ {"s", "short", 0},
+ {"t", "unsigned short", 0},
+ {"i", "int", 0},
+ {"j", "unsigned int", 0},
+ {"l", "long", 0},
+ {"m", "unsigned long", 0},
+ {"x", "long long", 0},
+ {"y", "unsigned long long", 0},
+ {"n", "__int128", 0},
+ {"o", "unsigned __int128", 0},
+ {"f", "float", 0},
+ {"d", "double", 0},
+ {"e", "long double", 0},
+ {"g", "__float128", 0},
+ {"z", "ellipsis", 0},
+
+ {"De", "decimal128", 0}, // IEEE 754r decimal floating point (128 bits)
+ {"Dd", "decimal64", 0}, // IEEE 754r decimal floating point (64 bits)
+ {"Dc", "decltype(auto)", 0},
+ {"Da", "auto", 0},
+ {"Dn", "std::nullptr_t", 0}, // i.e., decltype(nullptr)
+ {"Df", "decimal32", 0}, // IEEE 754r decimal floating point (32 bits)
+ {"Di", "char32_t", 0},
+ {"Du", "char8_t", 0},
+ {"Ds", "char16_t", 0},
+ {"Dh", "float16", 0}, // IEEE 754r half-precision float (16 bits)
+ {nullptr, nullptr, 0},
+};
+
+// List of substitutions Itanium C++ ABI.
+static const AbbrevPair kSubstitutionList[] = {
+ {"St", "", 0},
+ {"Sa", "allocator", 0},
+ {"Sb", "basic_string", 0},
+ // std::basic_string<char, std::char_traits<char>,std::allocator<char> >
+ {"Ss", "string", 0},
+ // std::basic_istream<char, std::char_traits<char> >
+ {"Si", "istream", 0},
+ // std::basic_ostream<char, std::char_traits<char> >
+ {"So", "ostream", 0},
+ // std::basic_iostream<char, std::char_traits<char> >
+ {"Sd", "iostream", 0},
+ {nullptr, nullptr, 0},
+};
+
+// State needed for demangling. This struct is copied in almost every stack
+// frame, so every byte counts.
+typedef struct {
+ int mangled_idx; // Cursor of mangled name.
+ int out_cur_idx; // Cursor of output string.
+ int prev_name_idx; // For constructors/destructors.
+ signed int prev_name_length : 16; // For constructors/destructors.
+ signed int nest_level : 15; // For nested names.
+ unsigned int append : 1; // Append flag.
+ // Note: for some reason MSVC can't pack "bool append : 1" into the same int
+ // with the above two fields, so we use an int instead. Amusingly it can pack
+ // "signed bool" as expected, but relying on that to continue to be a legal
+ // type seems ill-advised (as it's illegal in at least clang).
+} ParseState;
+
+static_assert(sizeof(ParseState) == 4 * sizeof(int),
+ "unexpected size of ParseState");
+
+// One-off state for demangling that's not subject to backtracking -- either
+// constant data, data that's intentionally immune to backtracking (steps), or
+// data that would never be changed by backtracking anyway (recursion_depth).
+//
+// Only one copy of this exists for each call to Demangle, so the size of this
+// struct is nearly inconsequential.
+typedef struct {
+ const char *mangled_begin; // Beginning of input string.
+ char *out; // Beginning of output string.
+ int out_end_idx; // One past last allowed output character.
+ int recursion_depth; // For stack exhaustion prevention.
+ int steps; // Cap how much work we'll do, regardless of depth.
+ ParseState parse_state; // Backtrackable state copied for most frames.
+} State;
+
+namespace {
+// Prevent deep recursion / stack exhaustion.
+// Also prevent unbounded handling of complex inputs.
+class ComplexityGuard {
+ public:
+ explicit ComplexityGuard(State *state) : state_(state) {
+ ++state->recursion_depth;
+ ++state->steps;
+ }
+ ~ComplexityGuard() { --state_->recursion_depth; }
+
+ // 256 levels of recursion seems like a reasonable upper limit on depth.
+ // 128 is not enough to demagle synthetic tests from demangle_unittest.txt:
+ // "_ZaaZZZZ..." and "_ZaaZcvZcvZ..."
+ static constexpr int kRecursionDepthLimit = 256;
+
+ // We're trying to pick a charitable upper-limit on how many parse steps are
+ // necessary to handle something that a human could actually make use of.
+ // This is mostly in place as a bound on how much work we'll do if we are
+ // asked to demangle an mangled name from an untrusted source, so it should be
+ // much larger than the largest expected symbol, but much smaller than the
+ // amount of work we can do in, e.g., a second.
+ //
+ // Some real-world symbols from an arbitrary binary started failing between
+ // 2^12 and 2^13, so we multiply the latter by an extra factor of 16 to set
+ // the limit.
+ //
+ // Spending one second on 2^17 parse steps would require each step to take
+ // 7.6us, or ~30000 clock cycles, so it's safe to say this can be done in
+ // under a second.
+ static constexpr int kParseStepsLimit = 1 << 17;
+
+ bool IsTooComplex() const {
+ return state_->recursion_depth > kRecursionDepthLimit ||
+ state_->steps > kParseStepsLimit;
+ }
+
+ private:
+ State *state_;
+};
+} // namespace
+
+// We don't use strlen() in libc since it's not guaranteed to be async
+// signal safe.
+static size_t StrLen(const char *str) {
+ size_t len = 0;
+ while (*str != '\0') {
+ ++str;
+ ++len;
+ }
+ return len;
+}
+
+// Returns true if "str" has at least "n" characters remaining.
+static bool AtLeastNumCharsRemaining(const char *str, int n) {
+ for (int i = 0; i < n; ++i) {
+ if (str[i] == '\0') {
+ return false;
+ }
+ }
+ return true;
+}
+
+// Returns true if "str" has "prefix" as a prefix.
+static bool StrPrefix(const char *str, const char *prefix) {
+ size_t i = 0;
+ while (str[i] != '\0' && prefix[i] != '\0' && str[i] == prefix[i]) {
+ ++i;
+ }
+ return prefix[i] == '\0'; // Consumed everything in "prefix".
+}
+
+static void InitState(State *state, const char *mangled, char *out,
+ int out_size) {
+ state->mangled_begin = mangled;
+ state->out = out;
+ state->out_end_idx = out_size;
+ state->recursion_depth = 0;
+ state->steps = 0;
+
+ state->parse_state.mangled_idx = 0;
+ state->parse_state.out_cur_idx = 0;
+ state->parse_state.prev_name_idx = 0;
+ state->parse_state.prev_name_length = -1;
+ state->parse_state.nest_level = -1;
+ state->parse_state.append = true;
+}
+
+static inline const char *RemainingInput(State *state) {
+ return &state->mangled_begin[state->parse_state.mangled_idx];
+}
+
+// Returns true and advances "mangled_idx" if we find "one_char_token"
+// at "mangled_idx" position. It is assumed that "one_char_token" does
+// not contain '\0'.
+static bool ParseOneCharToken(State *state, const char one_char_token) {
+ ComplexityGuard guard(state);
+ if (guard.IsTooComplex()) return false;
+ if (RemainingInput(state)[0] == one_char_token) {
+ ++state->parse_state.mangled_idx;
+ return true;
+ }
+ return false;
+}
+
+// Returns true and advances "mangled_cur" if we find "two_char_token"
+// at "mangled_cur" position. It is assumed that "two_char_token" does
+// not contain '\0'.
+static bool ParseTwoCharToken(State *state, const char *two_char_token) {
+ ComplexityGuard guard(state);
+ if (guard.IsTooComplex()) return false;
+ if (RemainingInput(state)[0] == two_char_token[0] &&
+ RemainingInput(state)[1] == two_char_token[1]) {
+ state->parse_state.mangled_idx += 2;
+ return true;
+ }
+ return false;
+}
+
+// Returns true and advances "mangled_cur" if we find any character in
+// "char_class" at "mangled_cur" position.
+static bool ParseCharClass(State *state, const char *char_class) {
+ ComplexityGuard guard(state);
+ if (guard.IsTooComplex()) return false;
+ if (RemainingInput(state)[0] == '\0') {
+ return false;
+ }
+ const char *p = char_class;
+ for (; *p != '\0'; ++p) {
+ if (RemainingInput(state)[0] == *p) {
+ ++state->parse_state.mangled_idx;
+ return true;
+ }
+ }
+ return false;
+}
+
+static bool ParseDigit(State *state, int *digit) {
+ char c = RemainingInput(state)[0];
+ if (ParseCharClass(state, "0123456789")) {
+ if (digit != nullptr) {
+ *digit = c - '0';
+ }
+ return true;
+ }
+ return false;
+}
+
+// This function is used for handling an optional non-terminal.
+static bool Optional(bool /*status*/) { return true; }
+
+// This function is used for handling <non-terminal>+ syntax.
+typedef bool (*ParseFunc)(State *);
+static bool OneOrMore(ParseFunc parse_func, State *state) {
+ if (parse_func(state)) {
+ while (parse_func(state)) {
+ }
+ return true;
+ }
+ return false;
+}
+
+// This function is used for handling <non-terminal>* syntax. The function
+// always returns true and must be followed by a termination token or a
+// terminating sequence not handled by parse_func (e.g.
+// ParseOneCharToken(state, 'E')).
+static bool ZeroOrMore(ParseFunc parse_func, State *state) {
+ while (parse_func(state)) {
+ }
+ return true;
+}
+
+// Append "str" at "out_cur_idx". If there is an overflow, out_cur_idx is
+// set to out_end_idx+1. The output string is ensured to
+// always terminate with '\0' as long as there is no overflow.
+static void Append(State *state, const char *const str, const int length) {
+ for (int i = 0; i < length; ++i) {
+ if (state->parse_state.out_cur_idx + 1 <
+ state->out_end_idx) { // +1 for '\0'
+ state->out[state->parse_state.out_cur_idx++] = str[i];
+ } else {
+ // signal overflow
+ state->parse_state.out_cur_idx = state->out_end_idx + 1;
+ break;
+ }
+ }
+ if (state->parse_state.out_cur_idx < state->out_end_idx) {
+ state->out[state->parse_state.out_cur_idx] =
+ '\0'; // Terminate it with '\0'
+ }
+}
+
+// We don't use equivalents in libc to avoid locale issues.
+static bool IsLower(char c) { return c >= 'a' && c <= 'z'; }
+
+static bool IsAlpha(char c) {
+ return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z');
+}
+
+static bool IsDigit(char c) { return c >= '0' && c <= '9'; }
+
+// Returns true if "str" is a function clone suffix. These suffixes are used
+// by GCC 4.5.x and later versions (and our locally-modified version of GCC
+// 4.4.x) to indicate functions which have been cloned during optimization.
+// We treat any sequence (.<alpha>+.<digit>+)+ as a function clone suffix.
+static bool IsFunctionCloneSuffix(const char *str) {
+ size_t i = 0;
+ while (str[i] != '\0') {
+ // Consume a single .<alpha>+.<digit>+ sequence.
+ if (str[i] != '.' || !IsAlpha(str[i + 1])) {
+ return false;
+ }
+ i += 2;
+ while (IsAlpha(str[i])) {
+ ++i;
+ }
+ if (str[i] != '.' || !IsDigit(str[i + 1])) {
+ return false;
+ }
+ i += 2;
+ while (IsDigit(str[i])) {
+ ++i;
+ }
+ }
+ return true; // Consumed everything in "str".
+}
+
+static bool EndsWith(State *state, const char chr) {
+ return state->parse_state.out_cur_idx > 0 &&
+ state->parse_state.out_cur_idx < state->out_end_idx &&
+ chr == state->out[state->parse_state.out_cur_idx - 1];
+}
+
+// Append "str" with some tweaks, iff "append" state is true.
+static void MaybeAppendWithLength(State *state, const char *const str,
+ const int length) {
+ if (state->parse_state.append && length > 0) {
+ // Append a space if the output buffer ends with '<' and "str"
+ // starts with '<' to avoid <<<.
+ if (str[0] == '<' && EndsWith(state, '<')) {
+ Append(state, " ", 1);
+ }
+ // Remember the last identifier name for ctors/dtors,
+ // but only if we haven't yet overflown the buffer.
+ if (state->parse_state.out_cur_idx < state->out_end_idx &&
+ (IsAlpha(str[0]) || str[0] == '_')) {
+ state->parse_state.prev_name_idx = state->parse_state.out_cur_idx;
+ state->parse_state.prev_name_length = length;
+ }
+ Append(state, str, length);
+ }
+}
+
+// Appends a positive decimal number to the output if appending is enabled.
+static bool MaybeAppendDecimal(State *state, unsigned int val) {
+ // Max {32-64}-bit unsigned int is 20 digits.
+ constexpr size_t kMaxLength = 20;
+ char buf[kMaxLength];
+
+ // We can't use itoa or sprintf as neither is specified to be
+ // async-signal-safe.
+ if (state->parse_state.append) {
+ // We can't have a one-before-the-beginning pointer, so instead start with
+ // one-past-the-end and manipulate one character before the pointer.
+ char *p = &buf[kMaxLength];
+ do { // val=0 is the only input that should write a leading zero digit.
+ *--p = (val % 10) + '0';
+ val /= 10;
+ } while (p > buf && val != 0);
+
+ // 'p' landed on the last character we set. How convenient.
+ Append(state, p, kMaxLength - (p - buf));
+ }
+
+ return true;
+}
+
+// A convenient wrapper around MaybeAppendWithLength().
+// Returns true so that it can be placed in "if" conditions.
+static bool MaybeAppend(State *state, const char *const str) {
+ if (state->parse_state.append) {
+ int length = StrLen(str);
+ MaybeAppendWithLength(state, str, length);
+ }
+ return true;
+}
+
+// This function is used for handling nested names.
+static bool EnterNestedName(State *state) {
+ state->parse_state.nest_level = 0;
+ return true;
+}
+
+// This function is used for handling nested names.
+static bool LeaveNestedName(State *state, int16_t prev_value) {
+ state->parse_state.nest_level = prev_value;
+ return true;
+}
+
+// Disable the append mode not to print function parameters, etc.
+static bool DisableAppend(State *state) {
+ state->parse_state.append = false;
+ return true;
+}
+
+// Restore the append mode to the previous state.
+static bool RestoreAppend(State *state, bool prev_value) {
+ state->parse_state.append = prev_value;
+ return true;
+}
+
+// Increase the nest level for nested names.
+static void MaybeIncreaseNestLevel(State *state) {
+ if (state->parse_state.nest_level > -1) {
+ ++state->parse_state.nest_level;
+ }
+}
+
+// Appends :: for nested names if necessary.
+static void MaybeAppendSeparator(State *state) {
+ if (state->parse_state.nest_level >= 1) {
+ MaybeAppend(state, "::");
+ }
+}
+
+// Cancel the last separator if necessary.
+static void MaybeCancelLastSeparator(State *state) {
+ if (state->parse_state.nest_level >= 1 && state->parse_state.append &&
+ state->parse_state.out_cur_idx >= 2) {
+ state->parse_state.out_cur_idx -= 2;
+ state->out[state->parse_state.out_cur_idx] = '\0';
+ }
+}
+
+// Returns true if the identifier of the given length pointed to by
+// "mangled_cur" is anonymous namespace.
+static bool IdentifierIsAnonymousNamespace(State *state, int length) {
+ // Returns true if "anon_prefix" is a proper prefix of "mangled_cur".
+ static const char anon_prefix[] = "_GLOBAL__N_";
+ return (length > static_cast<int>(sizeof(anon_prefix) - 1) &&
+ StrPrefix(RemainingInput(state), anon_prefix));
+}
+
+// Forward declarations of our parsing functions.
+static bool ParseMangledName(State *state);
+static bool ParseEncoding(State *state);
+static bool ParseName(State *state);
+static bool ParseUnscopedName(State *state);
+static bool ParseNestedName(State *state);
+static bool ParsePrefix(State *state);
+static bool ParseUnqualifiedName(State *state);
+static bool ParseSourceName(State *state);
+static bool ParseLocalSourceName(State *state);
+static bool ParseUnnamedTypeName(State *state);
+static bool ParseNumber(State *state, int *number_out);
+static bool ParseFloatNumber(State *state);
+static bool ParseSeqId(State *state);
+static bool ParseIdentifier(State *state, int length);
+static bool ParseOperatorName(State *state, int *arity);
+static bool ParseSpecialName(State *state);
+static bool ParseCallOffset(State *state);
+static bool ParseNVOffset(State *state);
+static bool ParseVOffset(State *state);
+static bool ParseCtorDtorName(State *state);
+static bool ParseDecltype(State *state);
+static bool ParseType(State *state);
+static bool ParseCVQualifiers(State *state);
+static bool ParseBuiltinType(State *state);
+static bool ParseFunctionType(State *state);
+static bool ParseBareFunctionType(State *state);
+static bool ParseClassEnumType(State *state);
+static bool ParseArrayType(State *state);
+static bool ParsePointerToMemberType(State *state);
+static bool ParseTemplateParam(State *state);
+static bool ParseTemplateTemplateParam(State *state);
+static bool ParseTemplateArgs(State *state);
+static bool ParseTemplateArg(State *state);
+static bool ParseBaseUnresolvedName(State *state);
+static bool ParseUnresolvedName(State *state);
+static bool ParseExpression(State *state);
+static bool ParseExprPrimary(State *state);
+static bool ParseExprCastValue(State *state);
+static bool ParseLocalName(State *state);
+static bool ParseLocalNameSuffix(State *state);
+static bool ParseDiscriminator(State *state);
+static bool ParseSubstitution(State *state, bool accept_std);
+
+// Implementation note: the following code is a straightforward
+// translation of the Itanium C++ ABI defined in BNF with a couple of
+// exceptions.
+//
+// - Support GNU extensions not defined in the Itanium C++ ABI
+// - <prefix> and <template-prefix> are combined to avoid infinite loop
+// - Reorder patterns to shorten the code
+// - Reorder patterns to give greedier functions precedence
+// We'll mark "Less greedy than" for these cases in the code
+//
+// Each parsing function changes the parse state and returns true on
+// success, or returns false and doesn't change the parse state (note:
+// the parse-steps counter increases regardless of success or failure).
+// To ensure that the parse state isn't changed in the latter case, we
+// save the original state before we call multiple parsing functions
+// consecutively with &&, and restore it if unsuccessful. See
+// ParseEncoding() as an example of this convention. We follow the
+// convention throughout the code.
+//
+// Originally we tried to do demangling without following the full ABI
+// syntax but it turned out we needed to follow the full syntax to
+// parse complicated cases like nested template arguments. Note that
+// implementing a full-fledged demangler isn't trivial (libiberty's
+// cp-demangle.c has +4300 lines).
+//
+// Note that (foo) in <(foo) ...> is a modifier to be ignored.
+//
+// Reference:
+// - Itanium C++ ABI
+// <https://mentorembedded.github.io/cxx-abi/abi.html#mangling>
+
+// <mangled-name> ::= _Z <encoding>
+static bool ParseMangledName(State *state) {
+ ComplexityGuard guard(state);
+ if (guard.IsTooComplex()) return false;
+ return ParseTwoCharToken(state, "_Z") && ParseEncoding(state);
+}
+
+// <encoding> ::= <(function) name> <bare-function-type>
+// ::= <(data) name>
+// ::= <special-name>
+static bool ParseEncoding(State *state) {
+ ComplexityGuard guard(state);
+ if (guard.IsTooComplex()) return false;
+ // Implementing the first two productions together as <name>
+ // [<bare-function-type>] avoids exponential blowup of backtracking.
+ //
+ // Since Optional(...) can't fail, there's no need to copy the state for
+ // backtracking.
+ if (ParseName(state) && Optional(ParseBareFunctionType(state))) {
+ return true;
+ }
+
+ if (ParseSpecialName(state)) {
+ return true;
+ }
+ return false;
+}
+
+// <name> ::= <nested-name>
+// ::= <unscoped-template-name> <template-args>
+// ::= <unscoped-name>
+// ::= <local-name>
+static bool ParseName(State *state) {
+ ComplexityGuard guard(state);
+ if (guard.IsTooComplex()) return false;
+ if (ParseNestedName(state) || ParseLocalName(state)) {
+ return true;
+ }
+
+ // We reorganize the productions to avoid re-parsing unscoped names.
+ // - Inline <unscoped-template-name> productions:
+ // <name> ::= <substitution> <template-args>
+ // ::= <unscoped-name> <template-args>
+ // ::= <unscoped-name>
+ // - Merge the two productions that start with unscoped-name:
+ // <name> ::= <unscoped-name> [<template-args>]
+
+ ParseState copy = state->parse_state;
+ // "std<...>" isn't a valid name.
+ if (ParseSubstitution(state, /*accept_std=*/false) &&
+ ParseTemplateArgs(state)) {
+ return true;
+ }
+ state->parse_state = copy;
+
+ // Note there's no need to restore state after this since only the first
+ // subparser can fail.
+ return ParseUnscopedName(state) && Optional(ParseTemplateArgs(state));
+}
+
+// <unscoped-name> ::= <unqualified-name>
+// ::= St <unqualified-name>
+static bool ParseUnscopedName(State *state) {
+ ComplexityGuard guard(state);
+ if (guard.IsTooComplex()) return false;
+ if (ParseUnqualifiedName(state)) {
+ return true;
+ }
+
+ ParseState copy = state->parse_state;
+ if (ParseTwoCharToken(state, "St") && MaybeAppend(state, "std::") &&
+ ParseUnqualifiedName(state)) {
+ return true;
+ }
+ state->parse_state = copy;
+ return false;
+}
+
+// <ref-qualifer> ::= R // lvalue method reference qualifier
+// ::= O // rvalue method reference qualifier
+static inline bool ParseRefQualifier(State *state) {
+ return ParseCharClass(state, "OR");
+}
+
+// <nested-name> ::= N [<CV-qualifiers>] [<ref-qualifier>] <prefix>
+// <unqualified-name> E
+// ::= N [<CV-qualifiers>] [<ref-qualifier>] <template-prefix>
+// <template-args> E
+static bool ParseNestedName(State *state) {
+ ComplexityGuard guard(state);
+ if (guard.IsTooComplex()) return false;
+ ParseState copy = state->parse_state;
+ if (ParseOneCharToken(state, 'N') && EnterNestedName(state) &&
+ Optional(ParseCVQualifiers(state)) &&
+ Optional(ParseRefQualifier(state)) && ParsePrefix(state) &&
+ LeaveNestedName(state, copy.nest_level) &&
+ ParseOneCharToken(state, 'E')) {
+ return true;
+ }
+ state->parse_state = copy;
+ return false;
+}
+
+// This part is tricky. If we literally translate them to code, we'll
+// end up infinite loop. Hence we merge them to avoid the case.
+//
+// <prefix> ::= <prefix> <unqualified-name>
+// ::= <template-prefix> <template-args>
+// ::= <template-param>
+// ::= <substitution>
+// ::= # empty
+// <template-prefix> ::= <prefix> <(template) unqualified-name>
+// ::= <template-param>
+// ::= <substitution>
+static bool ParsePrefix(State *state) {
+ ComplexityGuard guard(state);
+ if (guard.IsTooComplex()) return false;
+ bool has_something = false;
+ while (true) {
+ MaybeAppendSeparator(state);
+ if (ParseTemplateParam(state) ||
+ ParseSubstitution(state, /*accept_std=*/true) ||
+ ParseUnscopedName(state) ||
+ (ParseOneCharToken(state, 'M') && ParseUnnamedTypeName(state))) {
+ has_something = true;
+ MaybeIncreaseNestLevel(state);
+ continue;
+ }
+ MaybeCancelLastSeparator(state);
+ if (has_something && ParseTemplateArgs(state)) {
+ return ParsePrefix(state);
+ } else {
+ break;
+ }
+ }
+ return true;
+}
+
+// <unqualified-name> ::= <operator-name>
+// ::= <ctor-dtor-name>
+// ::= <source-name>
+// ::= <local-source-name> // GCC extension; see below.
+// ::= <unnamed-type-name>
+static bool ParseUnqualifiedName(State *state) {
+ ComplexityGuard guard(state);
+ if (guard.IsTooComplex()) return false;
+ return (ParseOperatorName(state, nullptr) || ParseCtorDtorName(state) ||
+ ParseSourceName(state) || ParseLocalSourceName(state) ||
+ ParseUnnamedTypeName(state));
+}
+
+// <source-name> ::= <positive length number> <identifier>
+static bool ParseSourceName(State *state) {
+ ComplexityGuard guard(state);
+ if (guard.IsTooComplex()) return false;
+ ParseState copy = state->parse_state;
+ int length = -1;
+ if (ParseNumber(state, &length) && ParseIdentifier(state, length)) {
+ return true;
+ }
+ state->parse_state = copy;
+ return false;
+}
+
+// <local-source-name> ::= L <source-name> [<discriminator>]
+//
+// References:
+// https://gcc.gnu.org/bugzilla/show_bug.cgi?id=31775
+// https://gcc.gnu.org/viewcvs?view=rev&revision=124467
+static bool ParseLocalSourceName(State *state) {
+ ComplexityGuard guard(state);
+ if (guard.IsTooComplex()) return false;
+ ParseState copy = state->parse_state;
+ if (ParseOneCharToken(state, 'L') && ParseSourceName(state) &&
+ Optional(ParseDiscriminator(state))) {
+ return true;
+ }
+ state->parse_state = copy;
+ return false;
+}
+
+// <unnamed-type-name> ::= Ut [<(nonnegative) number>] _
+// ::= <closure-type-name>
+// <closure-type-name> ::= Ul <lambda-sig> E [<(nonnegative) number>] _
+// <lambda-sig> ::= <(parameter) type>+
+static bool ParseUnnamedTypeName(State *state) {
+ ComplexityGuard guard(state);
+ if (guard.IsTooComplex()) return false;
+ ParseState copy = state->parse_state;
+ // Type's 1-based index n is encoded as { "", n == 1; itoa(n-2), otherwise }.
+ // Optionally parse the encoded value into 'which' and add 2 to get the index.
+ int which = -1;
+
+ // Unnamed type local to function or class.
+ if (ParseTwoCharToken(state, "Ut") && Optional(ParseNumber(state, &which)) &&
+ which <= std::numeric_limits<int>::max() - 2 && // Don't overflow.
+ ParseOneCharToken(state, '_')) {
+ MaybeAppend(state, "{unnamed type#");
+ MaybeAppendDecimal(state, 2 + which);
+ MaybeAppend(state, "}");
+ return true;
+ }
+ state->parse_state = copy;
+
+ // Closure type.
+ which = -1;
+ if (ParseTwoCharToken(state, "Ul") && DisableAppend(state) &&
+ OneOrMore(ParseType, state) && RestoreAppend(state, copy.append) &&
+ ParseOneCharToken(state, 'E') && Optional(ParseNumber(state, &which)) &&
+ which <= std::numeric_limits<int>::max() - 2 && // Don't overflow.
+ ParseOneCharToken(state, '_')) {
+ MaybeAppend(state, "{lambda()#");
+ MaybeAppendDecimal(state, 2 + which);
+ MaybeAppend(state, "}");
+ return true;
+ }
+ state->parse_state = copy;
+
+ return false;
+}
+
+// <number> ::= [n] <non-negative decimal integer>
+// If "number_out" is non-null, then *number_out is set to the value of the
+// parsed number on success.
+static bool ParseNumber(State *state, int *number_out) {
+ ComplexityGuard guard(state);
+ if (guard.IsTooComplex()) return false;
+ bool negative = false;
+ if (ParseOneCharToken(state, 'n')) {
+ negative = true;
+ }
+ const char *p = RemainingInput(state);
+ uint64_t number = 0;
+ for (; *p != '\0'; ++p) {
+ if (IsDigit(*p)) {
+ number = number * 10 + (*p - '0');
+ } else {
+ break;
+ }
+ }
+ // Apply the sign with uint64_t arithmetic so overflows aren't UB. Gives
+ // "incorrect" results for out-of-range inputs, but negative values only
+ // appear for literals, which aren't printed.
+ if (negative) {
+ number = ~number + 1;
+ }
+ if (p != RemainingInput(state)) { // Conversion succeeded.
+ state->parse_state.mangled_idx += p - RemainingInput(state);
+ if (number_out != nullptr) {
+ // Note: possibly truncate "number".
+ *number_out = number;
+ }
+ return true;
+ }
+ return false;
+}
+
+// Floating-point literals are encoded using a fixed-length lowercase
+// hexadecimal string.
+static bool ParseFloatNumber(State *state) {
+ ComplexityGuard guard(state);
+ if (guard.IsTooComplex()) return false;
+ const char *p = RemainingInput(state);
+ for (; *p != '\0'; ++p) {
+ if (!IsDigit(*p) && !(*p >= 'a' && *p <= 'f')) {
+ break;
+ }
+ }
+ if (p != RemainingInput(state)) { // Conversion succeeded.
+ state->parse_state.mangled_idx += p - RemainingInput(state);
+ return true;
+ }
+ return false;
+}
+
+// The <seq-id> is a sequence number in base 36,
+// using digits and upper case letters
+static bool ParseSeqId(State *state) {
+ ComplexityGuard guard(state);
+ if (guard.IsTooComplex()) return false;
+ const char *p = RemainingInput(state);
+ for (; *p != '\0'; ++p) {
+ if (!IsDigit(*p) && !(*p >= 'A' && *p <= 'Z')) {
+ break;
+ }
+ }
+ if (p != RemainingInput(state)) { // Conversion succeeded.
+ state->parse_state.mangled_idx += p - RemainingInput(state);
+ return true;
+ }
+ return false;
+}
+
+// <identifier> ::= <unqualified source code identifier> (of given length)
+static bool ParseIdentifier(State *state, int length) {
+ ComplexityGuard guard(state);
+ if (guard.IsTooComplex()) return false;
+ if (length < 0 || !AtLeastNumCharsRemaining(RemainingInput(state), length)) {
+ return false;
+ }
+ if (IdentifierIsAnonymousNamespace(state, length)) {
+ MaybeAppend(state, "(anonymous namespace)");
+ } else {
+ MaybeAppendWithLength(state, RemainingInput(state), length);
+ }
+ state->parse_state.mangled_idx += length;
+ return true;
+}
+
+// <operator-name> ::= nw, and other two letters cases
+// ::= cv <type> # (cast)
+// ::= v <digit> <source-name> # vendor extended operator
+static bool ParseOperatorName(State *state, int *arity) {
+ ComplexityGuard guard(state);
+ if (guard.IsTooComplex()) return false;
+ if (!AtLeastNumCharsRemaining(RemainingInput(state), 2)) {
+ return false;
+ }
+ // First check with "cv" (cast) case.
+ ParseState copy = state->parse_state;
+ if (ParseTwoCharToken(state, "cv") && MaybeAppend(state, "operator ") &&
+ EnterNestedName(state) && ParseType(state) &&
+ LeaveNestedName(state, copy.nest_level)) {
+ if (arity != nullptr) {
+ *arity = 1;
+ }
+ return true;
+ }
+ state->parse_state = copy;
+
+ // Then vendor extended operators.
+ if (ParseOneCharToken(state, 'v') && ParseDigit(state, arity) &&
+ ParseSourceName(state)) {
+ return true;
+ }
+ state->parse_state = copy;
+
+ // Other operator names should start with a lower alphabet followed
+ // by a lower/upper alphabet.
+ if (!(IsLower(RemainingInput(state)[0]) &&
+ IsAlpha(RemainingInput(state)[1]))) {
+ return false;
+ }
+ // We may want to perform a binary search if we really need speed.
+ const AbbrevPair *p;
+ for (p = kOperatorList; p->abbrev != nullptr; ++p) {
+ if (RemainingInput(state)[0] == p->abbrev[0] &&
+ RemainingInput(state)[1] == p->abbrev[1]) {
+ if (arity != nullptr) {
+ *arity = p->arity;
+ }
+ MaybeAppend(state, "operator");
+ if (IsLower(*p->real_name)) { // new, delete, etc.
+ MaybeAppend(state, " ");
+ }
+ MaybeAppend(state, p->real_name);
+ state->parse_state.mangled_idx += 2;
+ return true;
+ }
+ }
+ return false;
+}
+
+// <special-name> ::= TV <type>
+// ::= TT <type>
+// ::= TI <type>
+// ::= TS <type>
+// ::= TH <type> # thread-local
+// ::= Tc <call-offset> <call-offset> <(base) encoding>
+// ::= GV <(object) name>
+// ::= T <call-offset> <(base) encoding>
+// G++ extensions:
+// ::= TC <type> <(offset) number> _ <(base) type>
+// ::= TF <type>
+// ::= TJ <type>
+// ::= GR <name>
+// ::= GA <encoding>
+// ::= Th <call-offset> <(base) encoding>
+// ::= Tv <call-offset> <(base) encoding>
+//
+// Note: we don't care much about them since they don't appear in
+// stack traces. The are special data.
+static bool ParseSpecialName(State *state) {
+ ComplexityGuard guard(state);
+ if (guard.IsTooComplex()) return false;
+ ParseState copy = state->parse_state;
+ if (ParseOneCharToken(state, 'T') && ParseCharClass(state, "VTISH") &&
+ ParseType(state)) {
+ return true;
+ }
+ state->parse_state = copy;
+
+ if (ParseTwoCharToken(state, "Tc") && ParseCallOffset(state) &&
+ ParseCallOffset(state) && ParseEncoding(state)) {
+ return true;
+ }
+ state->parse_state = copy;
+
+ if (ParseTwoCharToken(state, "GV") && ParseName(state)) {
+ return true;
+ }
+ state->parse_state = copy;
+
+ if (ParseOneCharToken(state, 'T') && ParseCallOffset(state) &&
+ ParseEncoding(state)) {
+ return true;
+ }
+ state->parse_state = copy;
+
+ // G++ extensions
+ if (ParseTwoCharToken(state, "TC") && ParseType(state) &&
+ ParseNumber(state, nullptr) && ParseOneCharToken(state, '_') &&
+ DisableAppend(state) && ParseType(state)) {
+ RestoreAppend(state, copy.append);
+ return true;
+ }
+ state->parse_state = copy;
+
+ if (ParseOneCharToken(state, 'T') && ParseCharClass(state, "FJ") &&
+ ParseType(state)) {
+ return true;
+ }
+ state->parse_state = copy;
+
+ if (ParseTwoCharToken(state, "GR") && ParseName(state)) {
+ return true;
+ }
+ state->parse_state = copy;
+
+ if (ParseTwoCharToken(state, "GA") && ParseEncoding(state)) {
+ return true;
+ }
+ state->parse_state = copy;
+
+ if (ParseOneCharToken(state, 'T') && ParseCharClass(state, "hv") &&
+ ParseCallOffset(state) && ParseEncoding(state)) {
+ return true;
+ }
+ state->parse_state = copy;
+ return false;
+}
+
+// <call-offset> ::= h <nv-offset> _
+// ::= v <v-offset> _
+static bool ParseCallOffset(State *state) {
+ ComplexityGuard guard(state);
+ if (guard.IsTooComplex()) return false;
+ ParseState copy = state->parse_state;
+ if (ParseOneCharToken(state, 'h') && ParseNVOffset(state) &&
+ ParseOneCharToken(state, '_')) {
+ return true;
+ }
+ state->parse_state = copy;
+
+ if (ParseOneCharToken(state, 'v') && ParseVOffset(state) &&
+ ParseOneCharToken(state, '_')) {
+ return true;
+ }
+ state->parse_state = copy;
+
+ return false;
+}
+
+// <nv-offset> ::= <(offset) number>
+static bool ParseNVOffset(State *state) {
+ ComplexityGuard guard(state);
+ if (guard.IsTooComplex()) return false;
+ return ParseNumber(state, nullptr);
+}
+
+// <v-offset> ::= <(offset) number> _ <(virtual offset) number>
+static bool ParseVOffset(State *state) {
+ ComplexityGuard guard(state);
+ if (guard.IsTooComplex()) return false;
+ ParseState copy = state->parse_state;
+ if (ParseNumber(state, nullptr) && ParseOneCharToken(state, '_') &&
+ ParseNumber(state, nullptr)) {
+ return true;
+ }
+ state->parse_state = copy;
+ return false;
+}
+
+// <ctor-dtor-name> ::= C1 | C2 | C3 | CI1 <base-class-type> | CI2
+// <base-class-type>
+// ::= D0 | D1 | D2
+// # GCC extensions: "unified" constructor/destructor. See
+// #
+// https://github.com/gcc-mirror/gcc/blob/7ad17b583c3643bd4557f29b8391ca7ef08391f5/gcc/cp/mangle.c#L1847
+// ::= C4 | D4
+static bool ParseCtorDtorName(State *state) {
+ ComplexityGuard guard(state);
+ if (guard.IsTooComplex()) return false;
+ ParseState copy = state->parse_state;
+ if (ParseOneCharToken(state, 'C')) {
+ if (ParseCharClass(state, "1234")) {
+ const char *const prev_name =
+ state->out + state->parse_state.prev_name_idx;
+ MaybeAppendWithLength(state, prev_name,
+ state->parse_state.prev_name_length);
+ return true;
+ } else if (ParseOneCharToken(state, 'I') && ParseCharClass(state, "12") &&
+ ParseClassEnumType(state)) {
+ return true;
+ }
+ }
+ state->parse_state = copy;
+
+ if (ParseOneCharToken(state, 'D') && ParseCharClass(state, "0124")) {
+ const char *const prev_name = state->out + state->parse_state.prev_name_idx;
+ MaybeAppend(state, "~");
+ MaybeAppendWithLength(state, prev_name,
+ state->parse_state.prev_name_length);
+ return true;
+ }
+ state->parse_state = copy;
+ return false;
+}
+
+// <decltype> ::= Dt <expression> E # decltype of an id-expression or class
+// # member access (C++0x)
+// ::= DT <expression> E # decltype of an expression (C++0x)
+static bool ParseDecltype(State *state) {
+ ComplexityGuard guard(state);
+ if (guard.IsTooComplex()) return false;
+
+ ParseState copy = state->parse_state;
+ if (ParseOneCharToken(state, 'D') && ParseCharClass(state, "tT") &&
+ ParseExpression(state) && ParseOneCharToken(state, 'E')) {
+ return true;
+ }
+ state->parse_state = copy;
+
+ return false;
+}
+
+// <type> ::= <CV-qualifiers> <type>
+// ::= P <type> # pointer-to
+// ::= R <type> # reference-to
+// ::= O <type> # rvalue reference-to (C++0x)
+// ::= C <type> # complex pair (C 2000)
+// ::= G <type> # imaginary (C 2000)
+// ::= U <source-name> <type> # vendor extended type qualifier
+// ::= <builtin-type>
+// ::= <function-type>
+// ::= <class-enum-type> # note: just an alias for <name>
+// ::= <array-type>
+// ::= <pointer-to-member-type>
+// ::= <template-template-param> <template-args>
+// ::= <template-param>
+// ::= <decltype>
+// ::= <substitution>
+// ::= Dp <type> # pack expansion of (C++0x)
+// ::= Dv <num-elems> _ # GNU vector extension
+//
+static bool ParseType(State *state) {
+ ComplexityGuard guard(state);
+ if (guard.IsTooComplex()) return false;
+ ParseState copy = state->parse_state;
+
+ // We should check CV-qualifers, and PRGC things first.
+ //
+ // CV-qualifiers overlap with some operator names, but an operator name is not
+ // valid as a type. To avoid an ambiguity that can lead to exponential time
+ // complexity, refuse to backtrack the CV-qualifiers.
+ //
+ // _Z4aoeuIrMvvE
+ // => _Z 4aoeuI rM v v E
+ // aoeu<operator%=, void, void>
+ // => _Z 4aoeuI r Mv v E
+ // aoeu<void void::* restrict>
+ //
+ // By consuming the CV-qualifiers first, the former parse is disabled.
+ if (ParseCVQualifiers(state)) {
+ const bool result = ParseType(state);
+ if (!result) state->parse_state = copy;
+ return result;
+ }
+ state->parse_state = copy;
+
+ // Similarly, these tag characters can overlap with other <name>s resulting in
+ // two different parse prefixes that land on <template-args> in the same
+ // place, such as "C3r1xI...". So, disable the "ctor-name = C3" parse by
+ // refusing to backtrack the tag characters.
+ if (ParseCharClass(state, "OPRCG")) {
+ const bool result = ParseType(state);
+ if (!result) state->parse_state = copy;
+ return result;
+ }
+ state->parse_state = copy;
+
+ if (ParseTwoCharToken(state, "Dp") && ParseType(state)) {
+ return true;
+ }
+ state->parse_state = copy;
+
+ if (ParseOneCharToken(state, 'U') && ParseSourceName(state) &&
+ ParseType(state)) {
+ return true;
+ }
+ state->parse_state = copy;
+
+ if (ParseBuiltinType(state) || ParseFunctionType(state) ||
+ ParseClassEnumType(state) || ParseArrayType(state) ||
+ ParsePointerToMemberType(state) || ParseDecltype(state) ||
+ // "std" on its own isn't a type.
+ ParseSubstitution(state, /*accept_std=*/false)) {
+ return true;
+ }
+
+ if (ParseTemplateTemplateParam(state) && ParseTemplateArgs(state)) {
+ return true;
+ }
+ state->parse_state = copy;
+
+ // Less greedy than <template-template-param> <template-args>.
+ if (ParseTemplateParam(state)) {
+ return true;
+ }
+
+ if (ParseTwoCharToken(state, "Dv") && ParseNumber(state, nullptr) &&
+ ParseOneCharToken(state, '_')) {
+ return true;
+ }
+ state->parse_state = copy;
+
+ return false;
+}
+
+// <CV-qualifiers> ::= [r] [V] [K]
+// We don't allow empty <CV-qualifiers> to avoid infinite loop in
+// ParseType().
+static bool ParseCVQualifiers(State *state) {
+ ComplexityGuard guard(state);
+ if (guard.IsTooComplex()) return false;
+ int num_cv_qualifiers = 0;
+ num_cv_qualifiers += ParseOneCharToken(state, 'r');
+ num_cv_qualifiers += ParseOneCharToken(state, 'V');
+ num_cv_qualifiers += ParseOneCharToken(state, 'K');
+ return num_cv_qualifiers > 0;
+}
+
+// <builtin-type> ::= v, etc. # single-character builtin types
+// ::= u <source-name>
+// ::= Dd, etc. # two-character builtin types
+//
+// Not supported:
+// ::= DF <number> _ # _FloatN (N bits)
+//
+static bool ParseBuiltinType(State *state) {
+ ComplexityGuard guard(state);
+ if (guard.IsTooComplex()) return false;
+ const AbbrevPair *p;
+ for (p = kBuiltinTypeList; p->abbrev != nullptr; ++p) {
+ // Guaranteed only 1- or 2-character strings in kBuiltinTypeList.
+ if (p->abbrev[1] == '\0') {
+ if (ParseOneCharToken(state, p->abbrev[0])) {
+ MaybeAppend(state, p->real_name);
+ return true;
+ }
+ } else if (p->abbrev[2] == '\0' && ParseTwoCharToken(state, p->abbrev)) {
+ MaybeAppend(state, p->real_name);
+ return true;
+ }
+ }
+
+ ParseState copy = state->parse_state;
+ if (ParseOneCharToken(state, 'u') && ParseSourceName(state)) {
+ return true;
+ }
+ state->parse_state = copy;
+ return false;
+}
+
+// <exception-spec> ::= Do # non-throwing
+// exception-specification (e.g.,
+// noexcept, throw())
+// ::= DO <expression> E # computed (instantiation-dependent)
+// noexcept
+// ::= Dw <type>+ E # dynamic exception specification
+// with instantiation-dependent types
+static bool ParseExceptionSpec(State *state) {
+ ComplexityGuard guard(state);
+ if (guard.IsTooComplex()) return false;
+
+ if (ParseTwoCharToken(state, "Do")) return true;
+
+ ParseState copy = state->parse_state;
+ if (ParseTwoCharToken(state, "DO") && ParseExpression(state) &&
+ ParseOneCharToken(state, 'E')) {
+ return true;
+ }
+ state->parse_state = copy;
+ if (ParseTwoCharToken(state, "Dw") && OneOrMore(ParseType, state) &&
+ ParseOneCharToken(state, 'E')) {
+ return true;
+ }
+ state->parse_state = copy;
+
+ return false;
+}
+
+// <function-type> ::= [exception-spec] F [Y] <bare-function-type> [O] E
+static bool ParseFunctionType(State *state) {
+ ComplexityGuard guard(state);
+ if (guard.IsTooComplex()) return false;
+ ParseState copy = state->parse_state;
+ if (Optional(ParseExceptionSpec(state)) && ParseOneCharToken(state, 'F') &&
+ Optional(ParseOneCharToken(state, 'Y')) && ParseBareFunctionType(state) &&
+ Optional(ParseOneCharToken(state, 'O')) &&
+ ParseOneCharToken(state, 'E')) {
+ return true;
+ }
+ state->parse_state = copy;
+ return false;
+}
+
+// <bare-function-type> ::= <(signature) type>+
+static bool ParseBareFunctionType(State *state) {
+ ComplexityGuard guard(state);
+ if (guard.IsTooComplex()) return false;
+ ParseState copy = state->parse_state;
+ DisableAppend(state);
+ if (OneOrMore(ParseType, state)) {
+ RestoreAppend(state, copy.append);
+ MaybeAppend(state, "()");
+ return true;
+ }
+ state->parse_state = copy;
+ return false;
+}
+
+// <class-enum-type> ::= <name>
+static bool ParseClassEnumType(State *state) {
+ ComplexityGuard guard(state);
+ if (guard.IsTooComplex()) return false;
+ return ParseName(state);
+}
+
+// <array-type> ::= A <(positive dimension) number> _ <(element) type>
+// ::= A [<(dimension) expression>] _ <(element) type>
+static bool ParseArrayType(State *state) {
+ ComplexityGuard guard(state);
+ if (guard.IsTooComplex()) return false;
+ ParseState copy = state->parse_state;
+ if (ParseOneCharToken(state, 'A') && ParseNumber(state, nullptr) &&
+ ParseOneCharToken(state, '_') && ParseType(state)) {
+ return true;
+ }
+ state->parse_state = copy;
+
+ if (ParseOneCharToken(state, 'A') && Optional(ParseExpression(state)) &&
+ ParseOneCharToken(state, '_') && ParseType(state)) {
+ return true;
+ }
+ state->parse_state = copy;
+ return false;
+}
+
+// <pointer-to-member-type> ::= M <(class) type> <(member) type>
+static bool ParsePointerToMemberType(State *state) {
+ ComplexityGuard guard(state);
+ if (guard.IsTooComplex()) return false;
+ ParseState copy = state->parse_state;
+ if (ParseOneCharToken(state, 'M') && ParseType(state) && ParseType(state)) {
+ return true;
+ }
+ state->parse_state = copy;
+ return false;
+}
+
+// <template-param> ::= T_
+// ::= T <parameter-2 non-negative number> _
+static bool ParseTemplateParam(State *state) {
+ ComplexityGuard guard(state);
+ if (guard.IsTooComplex()) return false;
+ if (ParseTwoCharToken(state, "T_")) {
+ MaybeAppend(state, "?"); // We don't support template substitutions.
+ return true;
+ }
+
+ ParseState copy = state->parse_state;
+ if (ParseOneCharToken(state, 'T') && ParseNumber(state, nullptr) &&
+ ParseOneCharToken(state, '_')) {
+ MaybeAppend(state, "?"); // We don't support template substitutions.
+ return true;
+ }
+ state->parse_state = copy;
+ return false;
+}
+
+// <template-template-param> ::= <template-param>
+// ::= <substitution>
+static bool ParseTemplateTemplateParam(State *state) {
+ ComplexityGuard guard(state);
+ if (guard.IsTooComplex()) return false;
+ return (ParseTemplateParam(state) ||
+ // "std" on its own isn't a template.
+ ParseSubstitution(state, /*accept_std=*/false));
+}
+
+// <template-args> ::= I <template-arg>+ E
+static bool ParseTemplateArgs(State *state) {
+ ComplexityGuard guard(state);
+ if (guard.IsTooComplex()) return false;
+ ParseState copy = state->parse_state;
+ DisableAppend(state);
+ if (ParseOneCharToken(state, 'I') && OneOrMore(ParseTemplateArg, state) &&
+ ParseOneCharToken(state, 'E')) {
+ RestoreAppend(state, copy.append);
+ MaybeAppend(state, "<>");
+ return true;
+ }
+ state->parse_state = copy;
+ return false;
+}
+
+// <template-arg> ::= <type>
+// ::= <expr-primary>
+// ::= J <template-arg>* E # argument pack
+// ::= X <expression> E
+static bool ParseTemplateArg(State *state) {
+ ComplexityGuard guard(state);
+ if (guard.IsTooComplex()) return false;
+ ParseState copy = state->parse_state;
+ if (ParseOneCharToken(state, 'J') && ZeroOrMore(ParseTemplateArg, state) &&
+ ParseOneCharToken(state, 'E')) {
+ return true;
+ }
+ state->parse_state = copy;
+
+ // There can be significant overlap between the following leading to
+ // exponential backtracking:
+ //
+ // <expr-primary> ::= L <type> <expr-cast-value> E
+ // e.g. L 2xxIvE 1 E
+ // <type> ==> <local-source-name> <template-args>
+ // e.g. L 2xx IvE
+ //
+ // This means parsing an entire <type> twice, and <type> can contain
+ // <template-arg>, so this can generate exponential backtracking. There is
+ // only overlap when the remaining input starts with "L <source-name>", so
+ // parse all cases that can start this way jointly to share the common prefix.
+ //
+ // We have:
+ //
+ // <template-arg> ::= <type>
+ // ::= <expr-primary>
+ //
+ // First, drop all the productions of <type> that must start with something
+ // other than 'L'. All that's left is <class-enum-type>; inline it.
+ //
+ // <type> ::= <nested-name> # starts with 'N'
+ // ::= <unscoped-name>
+ // ::= <unscoped-template-name> <template-args>
+ // ::= <local-name> # starts with 'Z'
+ //
+ // Drop and inline again:
+ //
+ // <type> ::= <unscoped-name>
+ // ::= <unscoped-name> <template-args>
+ // ::= <substitution> <template-args> # starts with 'S'
+ //
+ // Merge the first two, inline <unscoped-name>, drop last:
+ //
+ // <type> ::= <unqualified-name> [<template-args>]
+ // ::= St <unqualified-name> [<template-args>] # starts with 'S'
+ //
+ // Drop and inline:
+ //
+ // <type> ::= <operator-name> [<template-args>] # starts with lowercase
+ // ::= <ctor-dtor-name> [<template-args>] # starts with 'C' or 'D'
+ // ::= <source-name> [<template-args>] # starts with digit
+ // ::= <local-source-name> [<template-args>]
+ // ::= <unnamed-type-name> [<template-args>] # starts with 'U'
+ //
+ // One more time:
+ //
+ // <type> ::= L <source-name> [<template-args>]
+ //
+ // Likewise with <expr-primary>:
+ //
+ // <expr-primary> ::= L <type> <expr-cast-value> E
+ // ::= LZ <encoding> E # cannot overlap; drop
+ // ::= L <mangled_name> E # cannot overlap; drop
+ //
+ // By similar reasoning as shown above, the only <type>s starting with
+ // <source-name> are "<source-name> [<template-args>]". Inline this.
+ //
+ // <expr-primary> ::= L <source-name> [<template-args>] <expr-cast-value> E
+ //
+ // Now inline both of these into <template-arg>:
+ //
+ // <template-arg> ::= L <source-name> [<template-args>]
+ // ::= L <source-name> [<template-args>] <expr-cast-value> E
+ //
+ // Merge them and we're done:
+ // <template-arg>
+ // ::= L <source-name> [<template-args>] [<expr-cast-value> E]
+ if (ParseLocalSourceName(state) && Optional(ParseTemplateArgs(state))) {
+ copy = state->parse_state;
+ if (ParseExprCastValue(state) && ParseOneCharToken(state, 'E')) {
+ return true;
+ }
+ state->parse_state = copy;
+ return true;
+ }
+
+ // Now that the overlapping cases can't reach this code, we can safely call
+ // both of these.
+ if (ParseType(state) || ParseExprPrimary(state)) {
+ return true;
+ }
+ state->parse_state = copy;
+
+ if (ParseOneCharToken(state, 'X') && ParseExpression(state) &&
+ ParseOneCharToken(state, 'E')) {
+ return true;
+ }
+ state->parse_state = copy;
+ return false;
+}
+
+// <unresolved-type> ::= <template-param> [<template-args>]
+// ::= <decltype>
+// ::= <substitution>
+static inline bool ParseUnresolvedType(State *state) {
+ // No ComplexityGuard because we don't copy the state in this stack frame.
+ return (ParseTemplateParam(state) && Optional(ParseTemplateArgs(state))) ||
+ ParseDecltype(state) || ParseSubstitution(state, /*accept_std=*/false);
+}
+
+// <simple-id> ::= <source-name> [<template-args>]
+static inline bool ParseSimpleId(State *state) {
+ // No ComplexityGuard because we don't copy the state in this stack frame.
+
+ // Note: <simple-id> cannot be followed by a parameter pack; see comment in
+ // ParseUnresolvedType.
+ return ParseSourceName(state) && Optional(ParseTemplateArgs(state));
+}
+
+// <base-unresolved-name> ::= <source-name> [<template-args>]
+// ::= on <operator-name> [<template-args>]
+// ::= dn <destructor-name>
+static bool ParseBaseUnresolvedName(State *state) {
+ ComplexityGuard guard(state);
+ if (guard.IsTooComplex()) return false;
+
+ if (ParseSimpleId(state)) {
+ return true;
+ }
+
+ ParseState copy = state->parse_state;
+ if (ParseTwoCharToken(state, "on") && ParseOperatorName(state, nullptr) &&
+ Optional(ParseTemplateArgs(state))) {
+ return true;
+ }
+ state->parse_state = copy;
+
+ if (ParseTwoCharToken(state, "dn") &&
+ (ParseUnresolvedType(state) || ParseSimpleId(state))) {
+ return true;
+ }
+ state->parse_state = copy;
+
+ return false;
+}
+
+// <unresolved-name> ::= [gs] <base-unresolved-name>
+// ::= sr <unresolved-type> <base-unresolved-name>
+// ::= srN <unresolved-type> <unresolved-qualifier-level>+ E
+// <base-unresolved-name>
+// ::= [gs] sr <unresolved-qualifier-level>+ E
+// <base-unresolved-name>
+static bool ParseUnresolvedName(State *state) {
+ ComplexityGuard guard(state);
+ if (guard.IsTooComplex()) return false;
+
+ ParseState copy = state->parse_state;
+ if (Optional(ParseTwoCharToken(state, "gs")) &&
+ ParseBaseUnresolvedName(state)) {
+ return true;
+ }
+ state->parse_state = copy;
+
+ if (ParseTwoCharToken(state, "sr") && ParseUnresolvedType(state) &&
+ ParseBaseUnresolvedName(state)) {
+ return true;
+ }
+ state->parse_state = copy;
+
+ if (ParseTwoCharToken(state, "sr") && ParseOneCharToken(state, 'N') &&
+ ParseUnresolvedType(state) &&
+ OneOrMore(/* <unresolved-qualifier-level> ::= */ ParseSimpleId, state) &&
+ ParseOneCharToken(state, 'E') && ParseBaseUnresolvedName(state)) {
+ return true;
+ }
+ state->parse_state = copy;
+
+ if (Optional(ParseTwoCharToken(state, "gs")) &&
+ ParseTwoCharToken(state, "sr") &&
+ OneOrMore(/* <unresolved-qualifier-level> ::= */ ParseSimpleId, state) &&
+ ParseOneCharToken(state, 'E') && ParseBaseUnresolvedName(state)) {
+ return true;
+ }
+ state->parse_state = copy;
+
+ return false;
+}
+
+// <expression> ::= <1-ary operator-name> <expression>
+// ::= <2-ary operator-name> <expression> <expression>
+// ::= <3-ary operator-name> <expression> <expression> <expression>
+// ::= cl <expression>+ E
+// ::= cv <type> <expression> # type (expression)
+// ::= cv <type> _ <expression>* E # type (expr-list)
+// ::= st <type>
+// ::= <template-param>
+// ::= <function-param>
+// ::= <expr-primary>
+// ::= dt <expression> <unresolved-name> # expr.name
+// ::= pt <expression> <unresolved-name> # expr->name
+// ::= sp <expression> # argument pack expansion
+// ::= sr <type> <unqualified-name> <template-args>
+// ::= sr <type> <unqualified-name>
+// <function-param> ::= fp <(top-level) CV-qualifiers> _
+// ::= fp <(top-level) CV-qualifiers> <number> _
+// ::= fL <number> p <(top-level) CV-qualifiers> _
+// ::= fL <number> p <(top-level) CV-qualifiers> <number> _
+static bool ParseExpression(State *state) {
+ ComplexityGuard guard(state);
+ if (guard.IsTooComplex()) return false;
+ if (ParseTemplateParam(state) || ParseExprPrimary(state)) {
+ return true;
+ }
+
+ // Object/function call expression.
+ ParseState copy = state->parse_state;
+ if (ParseTwoCharToken(state, "cl") && OneOrMore(ParseExpression, state) &&
+ ParseOneCharToken(state, 'E')) {
+ return true;
+ }
+ state->parse_state = copy;
+
+ // Function-param expression (level 0).
+ if (ParseTwoCharToken(state, "fp") && Optional(ParseCVQualifiers(state)) &&
+ Optional(ParseNumber(state, nullptr)) && ParseOneCharToken(state, '_')) {
+ return true;
+ }
+ state->parse_state = copy;
+
+ // Function-param expression (level 1+).
+ if (ParseTwoCharToken(state, "fL") && Optional(ParseNumber(state, nullptr)) &&
+ ParseOneCharToken(state, 'p') && Optional(ParseCVQualifiers(state)) &&
+ Optional(ParseNumber(state, nullptr)) && ParseOneCharToken(state, '_')) {
+ return true;
+ }
+ state->parse_state = copy;
+
+ // Parse the conversion expressions jointly to avoid re-parsing the <type> in
+ // their common prefix. Parsed as:
+ // <expression> ::= cv <type> <conversion-args>
+ // <conversion-args> ::= _ <expression>* E
+ // ::= <expression>
+ //
+ // Also don't try ParseOperatorName after seeing "cv", since ParseOperatorName
+ // also needs to accept "cv <type>" in other contexts.
+ if (ParseTwoCharToken(state, "cv")) {
+ if (ParseType(state)) {
+ ParseState copy2 = state->parse_state;
+ if (ParseOneCharToken(state, '_') && ZeroOrMore(ParseExpression, state) &&
+ ParseOneCharToken(state, 'E')) {
+ return true;
+ }
+ state->parse_state = copy2;
+ if (ParseExpression(state)) {
+ return true;
+ }
+ }
+ } else {
+ // Parse unary, binary, and ternary operator expressions jointly, taking
+ // care not to re-parse subexpressions repeatedly. Parse like:
+ // <expression> ::= <operator-name> <expression>
+ // [<one-to-two-expressions>]
+ // <one-to-two-expressions> ::= <expression> [<expression>]
+ int arity = -1;
+ if (ParseOperatorName(state, &arity) &&
+ arity > 0 && // 0 arity => disabled.
+ (arity < 3 || ParseExpression(state)) &&
+ (arity < 2 || ParseExpression(state)) &&
+ (arity < 1 || ParseExpression(state))) {
+ return true;
+ }
+ }
+ state->parse_state = copy;
+
+ // sizeof type
+ if (ParseTwoCharToken(state, "st") && ParseType(state)) {
+ return true;
+ }
+ state->parse_state = copy;
+
+ // Object and pointer member access expressions.
+ if ((ParseTwoCharToken(state, "dt") || ParseTwoCharToken(state, "pt")) &&
+ ParseExpression(state) && ParseType(state)) {
+ return true;
+ }
+ state->parse_state = copy;
+
+ // Pointer-to-member access expressions. This parses the same as a binary
+ // operator, but it's implemented separately because "ds" shouldn't be
+ // accepted in other contexts that parse an operator name.
+ if (ParseTwoCharToken(state, "ds") && ParseExpression(state) &&
+ ParseExpression(state)) {
+ return true;
+ }
+ state->parse_state = copy;
+
+ // Parameter pack expansion
+ if (ParseTwoCharToken(state, "sp") && ParseExpression(state)) {
+ return true;
+ }
+ state->parse_state = copy;
+
+ return ParseUnresolvedName(state);
+}
+
+// <expr-primary> ::= L <type> <(value) number> E
+// ::= L <type> <(value) float> E
+// ::= L <mangled-name> E
+// // A bug in g++'s C++ ABI version 2 (-fabi-version=2).
+// ::= LZ <encoding> E
+//
+// Warning, subtle: the "bug" LZ production above is ambiguous with the first
+// production where <type> starts with <local-name>, which can lead to
+// exponential backtracking in two scenarios:
+//
+// - When whatever follows the E in the <local-name> in the first production is
+// not a name, we backtrack the whole <encoding> and re-parse the whole thing.
+//
+// - When whatever follows the <local-name> in the first production is not a
+// number and this <expr-primary> may be followed by a name, we backtrack the
+// <name> and re-parse it.
+//
+// Moreover this ambiguity isn't always resolved -- for example, the following
+// has two different parses:
+//
+// _ZaaILZ4aoeuE1x1EvE
+// => operator&&<aoeu, x, E, void>
+// => operator&&<(aoeu::x)(1), void>
+//
+// To resolve this, we just do what GCC's demangler does, and refuse to parse
+// casts to <local-name> types.
+static bool ParseExprPrimary(State *state) {
+ ComplexityGuard guard(state);
+ if (guard.IsTooComplex()) return false;
+ ParseState copy = state->parse_state;
+
+ // The "LZ" special case: if we see LZ, we commit to accept "LZ <encoding> E"
+ // or fail, no backtracking.
+ if (ParseTwoCharToken(state, "LZ")) {
+ if (ParseEncoding(state) && ParseOneCharToken(state, 'E')) {
+ return true;
+ }
+
+ state->parse_state = copy;
+ return false;
+ }
+
+ // The merged cast production.
+ if (ParseOneCharToken(state, 'L') && ParseType(state) &&
+ ParseExprCastValue(state)) {
+ return true;
+ }
+ state->parse_state = copy;
+
+ if (ParseOneCharToken(state, 'L') && ParseMangledName(state) &&
+ ParseOneCharToken(state, 'E')) {
+ return true;
+ }
+ state->parse_state = copy;
+
+ return false;
+}
+
+// <number> or <float>, followed by 'E', as described above ParseExprPrimary.
+static bool ParseExprCastValue(State *state) {
+ ComplexityGuard guard(state);
+ if (guard.IsTooComplex()) return false;
+ // We have to be able to backtrack after accepting a number because we could
+ // have e.g. "7fffE", which will accept "7" as a number but then fail to find
+ // the 'E'.
+ ParseState copy = state->parse_state;
+ if (ParseNumber(state, nullptr) && ParseOneCharToken(state, 'E')) {
+ return true;
+ }
+ state->parse_state = copy;
+
+ if (ParseFloatNumber(state) && ParseOneCharToken(state, 'E')) {
+ return true;
+ }
+ state->parse_state = copy;
+
+ return false;
+}
+
+// <local-name> ::= Z <(function) encoding> E <(entity) name> [<discriminator>]
+// ::= Z <(function) encoding> E s [<discriminator>]
+//
+// Parsing a common prefix of these two productions together avoids an
+// exponential blowup of backtracking. Parse like:
+// <local-name> := Z <encoding> E <local-name-suffix>
+// <local-name-suffix> ::= s [<discriminator>]
+// ::= <name> [<discriminator>]
+
+static bool ParseLocalNameSuffix(State *state) {
+ ComplexityGuard guard(state);
+ if (guard.IsTooComplex()) return false;
+
+ if (MaybeAppend(state, "::") && ParseName(state) &&
+ Optional(ParseDiscriminator(state))) {
+ return true;
+ }
+
+ // Since we're not going to overwrite the above "::" by re-parsing the
+ // <encoding> (whose trailing '\0' byte was in the byte now holding the
+ // first ':'), we have to rollback the "::" if the <name> parse failed.
+ if (state->parse_state.append) {
+ state->out[state->parse_state.out_cur_idx - 2] = '\0';
+ }
+
+ return ParseOneCharToken(state, 's') && Optional(ParseDiscriminator(state));
+}
+
+static bool ParseLocalName(State *state) {
+ ComplexityGuard guard(state);
+ if (guard.IsTooComplex()) return false;
+ ParseState copy = state->parse_state;
+ if (ParseOneCharToken(state, 'Z') && ParseEncoding(state) &&
+ ParseOneCharToken(state, 'E') && ParseLocalNameSuffix(state)) {
+ return true;
+ }
+ state->parse_state = copy;
+ return false;
+}
+
+// <discriminator> := _ <(non-negative) number>
+static bool ParseDiscriminator(State *state) {
+ ComplexityGuard guard(state);
+ if (guard.IsTooComplex()) return false;
+ ParseState copy = state->parse_state;
+ if (ParseOneCharToken(state, '_') && ParseNumber(state, nullptr)) {
+ return true;
+ }
+ state->parse_state = copy;
+ return false;
+}
+
+// <substitution> ::= S_
+// ::= S <seq-id> _
+// ::= St, etc.
+//
+// "St" is special in that it's not valid as a standalone name, and it *is*
+// allowed to precede a name without being wrapped in "N...E". This means that
+// if we accept it on its own, we can accept "St1a" and try to parse
+// template-args, then fail and backtrack, accept "St" on its own, then "1a" as
+// an unqualified name and re-parse the same template-args. To block this
+// exponential backtracking, we disable it with 'accept_std=false' in
+// problematic contexts.
+static bool ParseSubstitution(State *state, bool accept_std) {
+ ComplexityGuard guard(state);
+ if (guard.IsTooComplex()) return false;
+ if (ParseTwoCharToken(state, "S_")) {
+ MaybeAppend(state, "?"); // We don't support substitutions.
+ return true;
+ }
+
+ ParseState copy = state->parse_state;
+ if (ParseOneCharToken(state, 'S') && ParseSeqId(state) &&
+ ParseOneCharToken(state, '_')) {
+ MaybeAppend(state, "?"); // We don't support substitutions.
+ return true;
+ }
+ state->parse_state = copy;
+
+ // Expand abbreviations like "St" => "std".
+ if (ParseOneCharToken(state, 'S')) {
+ const AbbrevPair *p;
+ for (p = kSubstitutionList; p->abbrev != nullptr; ++p) {
+ if (RemainingInput(state)[0] == p->abbrev[1] &&
+ (accept_std || p->abbrev[1] != 't')) {
+ MaybeAppend(state, "std");
+ if (p->real_name[0] != '\0') {
+ MaybeAppend(state, "::");
+ MaybeAppend(state, p->real_name);
+ }
+ ++state->parse_state.mangled_idx;
+ return true;
+ }
+ }
+ }
+ state->parse_state = copy;
+ return false;
+}
+
+// Parse <mangled-name>, optionally followed by either a function-clone suffix
+// or version suffix. Returns true only if all of "mangled_cur" was consumed.
+static bool ParseTopLevelMangledName(State *state) {
+ ComplexityGuard guard(state);
+ if (guard.IsTooComplex()) return false;
+ if (ParseMangledName(state)) {
+ if (RemainingInput(state)[0] != '\0') {
+ // Drop trailing function clone suffix, if any.
+ if (IsFunctionCloneSuffix(RemainingInput(state))) {
+ return true;
+ }
+ // Append trailing version suffix if any.
+ // ex. _Z3foo@@GLIBCXX_3.4
+ if (RemainingInput(state)[0] == '@') {
+ MaybeAppend(state, RemainingInput(state));
+ return true;
+ }
+ return false; // Unconsumed suffix.
+ }
+ return true;
+ }
+ return false;
+}
+
+static bool Overflowed(const State *state) {
+ return state->parse_state.out_cur_idx >= state->out_end_idx;
+}
+
+// The demangler entry point.
+bool Demangle(const char *mangled, char *out, int out_size) {
+ State state;
+ InitState(&state, mangled, out, out_size);
+ return ParseTopLevelMangledName(&state) && !Overflowed(&state) &&
+ state.parse_state.out_cur_idx > 0;
+}
+
+} // namespace debugging_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/debugging/internal/demangle.h b/third_party/abseil/src/absl/debugging/internal/demangle.h
new file mode 100644
index 0000000..c314d9b
--- /dev/null
+++ b/third_party/abseil/src/absl/debugging/internal/demangle.h
@@ -0,0 +1,71 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// An async-signal-safe and thread-safe demangler for Itanium C++ ABI
+// (aka G++ V3 ABI).
+//
+// The demangler is implemented to be used in async signal handlers to
+// symbolize stack traces. We cannot use libstdc++'s
+// abi::__cxa_demangle() in such signal handlers since it's not async
+// signal safe (it uses malloc() internally).
+//
+// Note that this demangler doesn't support full demangling. More
+// specifically, it doesn't print types of function parameters and
+// types of template arguments. It just skips them. However, it's
+// still very useful to extract basic information such as class,
+// function, constructor, destructor, and operator names.
+//
+// See the implementation note in demangle.cc if you are interested.
+//
+// Example:
+//
+// | Mangled Name | The Demangler | abi::__cxa_demangle()
+// |---------------|---------------|-----------------------
+// | _Z1fv | f() | f()
+// | _Z1fi | f() | f(int)
+// | _Z3foo3bar | foo() | foo(bar)
+// | _Z1fIiEvi | f<>() | void f<int>(int)
+// | _ZN1N1fE | N::f | N::f
+// | _ZN3Foo3BarEv | Foo::Bar() | Foo::Bar()
+// | _Zrm1XS_" | operator%() | operator%(X, X)
+// | _ZN3FooC1Ev | Foo::Foo() | Foo::Foo()
+// | _Z1fSs | f() | f(std::basic_string<char,
+// | | | std::char_traits<char>,
+// | | | std::allocator<char> >)
+//
+// See the unit test for more examples.
+//
+// Note: we might want to write demanglers for ABIs other than Itanium
+// C++ ABI in the future.
+//
+
+#ifndef ABSL_DEBUGGING_INTERNAL_DEMANGLE_H_
+#define ABSL_DEBUGGING_INTERNAL_DEMANGLE_H_
+
+#include "absl/base/config.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace debugging_internal {
+
+// Demangle `mangled`. On success, return true and write the
+// demangled symbol name to `out`. Otherwise, return false.
+// `out` is modified even if demangling is unsuccessful.
+bool Demangle(const char *mangled, char *out, int out_size);
+
+} // namespace debugging_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_DEBUGGING_INTERNAL_DEMANGLE_H_
diff --git a/third_party/abseil/src/absl/debugging/internal/demangle_test.cc b/third_party/abseil/src/absl/debugging/internal/demangle_test.cc
new file mode 100644
index 0000000..0bed735
--- /dev/null
+++ b/third_party/abseil/src/absl/debugging/internal/demangle_test.cc
@@ -0,0 +1,197 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/debugging/internal/demangle.h"
+
+#include <cstdlib>
+#include <string>
+
+#include "gtest/gtest.h"
+#include "absl/base/config.h"
+#include "absl/base/internal/raw_logging.h"
+#include "absl/debugging/internal/stack_consumption.h"
+#include "absl/memory/memory.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace debugging_internal {
+namespace {
+
+// A wrapper function for Demangle() to make the unit test simple.
+static const char *DemangleIt(const char * const mangled) {
+ static char demangled[4096];
+ if (Demangle(mangled, demangled, sizeof(demangled))) {
+ return demangled;
+ } else {
+ return mangled;
+ }
+}
+
+// Test corner cases of bounary conditions.
+TEST(Demangle, CornerCases) {
+ char tmp[10];
+ EXPECT_TRUE(Demangle("_Z6foobarv", tmp, sizeof(tmp)));
+ // sizeof("foobar()") == 9
+ EXPECT_STREQ("foobar()", tmp);
+ EXPECT_TRUE(Demangle("_Z6foobarv", tmp, 9));
+ EXPECT_STREQ("foobar()", tmp);
+ EXPECT_FALSE(Demangle("_Z6foobarv", tmp, 8)); // Not enough.
+ EXPECT_FALSE(Demangle("_Z6foobarv", tmp, 1));
+ EXPECT_FALSE(Demangle("_Z6foobarv", tmp, 0));
+ EXPECT_FALSE(Demangle("_Z6foobarv", nullptr, 0)); // Should not cause SEGV.
+ EXPECT_FALSE(Demangle("_Z1000000", tmp, 9));
+}
+
+// Test handling of functions suffixed with .clone.N, which is used
+// by GCC 4.5.x (and our locally-modified version of GCC 4.4.x), and
+// .constprop.N and .isra.N, which are used by GCC 4.6.x. These
+// suffixes are used to indicate functions which have been cloned
+// during optimization. We ignore these suffixes.
+TEST(Demangle, Clones) {
+ char tmp[20];
+ EXPECT_TRUE(Demangle("_ZL3Foov", tmp, sizeof(tmp)));
+ EXPECT_STREQ("Foo()", tmp);
+ EXPECT_TRUE(Demangle("_ZL3Foov.clone.3", tmp, sizeof(tmp)));
+ EXPECT_STREQ("Foo()", tmp);
+ EXPECT_TRUE(Demangle("_ZL3Foov.constprop.80", tmp, sizeof(tmp)));
+ EXPECT_STREQ("Foo()", tmp);
+ EXPECT_TRUE(Demangle("_ZL3Foov.isra.18", tmp, sizeof(tmp)));
+ EXPECT_STREQ("Foo()", tmp);
+ EXPECT_TRUE(Demangle("_ZL3Foov.isra.2.constprop.18", tmp, sizeof(tmp)));
+ EXPECT_STREQ("Foo()", tmp);
+ // Invalid (truncated), should not demangle.
+ EXPECT_FALSE(Demangle("_ZL3Foov.clo", tmp, sizeof(tmp)));
+ // Invalid (.clone. not followed by number), should not demangle.
+ EXPECT_FALSE(Demangle("_ZL3Foov.clone.", tmp, sizeof(tmp)));
+ // Invalid (.clone. followed by non-number), should not demangle.
+ EXPECT_FALSE(Demangle("_ZL3Foov.clone.foo", tmp, sizeof(tmp)));
+ // Invalid (.constprop. not followed by number), should not demangle.
+ EXPECT_FALSE(Demangle("_ZL3Foov.isra.2.constprop.", tmp, sizeof(tmp)));
+}
+
+// Tests that verify that Demangle footprint is within some limit.
+// They are not to be run under sanitizers as the sanitizers increase
+// stack consumption by about 4x.
+#if defined(ABSL_INTERNAL_HAVE_DEBUGGING_STACK_CONSUMPTION) && \
+ !defined(ABSL_HAVE_ADDRESS_SANITIZER) && \
+ !defined(ABSL_HAVE_MEMORY_SANITIZER) && \
+ !defined(ABSL_HAVE_THREAD_SANITIZER)
+
+static const char *g_mangled;
+static char g_demangle_buffer[4096];
+static char *g_demangle_result;
+
+static void DemangleSignalHandler(int signo) {
+ if (Demangle(g_mangled, g_demangle_buffer, sizeof(g_demangle_buffer))) {
+ g_demangle_result = g_demangle_buffer;
+ } else {
+ g_demangle_result = nullptr;
+ }
+}
+
+// Call Demangle and figure out the stack footprint of this call.
+static const char *DemangleStackConsumption(const char *mangled,
+ int *stack_consumed) {
+ g_mangled = mangled;
+ *stack_consumed = GetSignalHandlerStackConsumption(DemangleSignalHandler);
+ ABSL_RAW_LOG(INFO, "Stack consumption of Demangle: %d", *stack_consumed);
+ return g_demangle_result;
+}
+
+// Demangle stack consumption should be within 8kB for simple mangled names
+// with some level of nesting. With alternate signal stack we have 64K,
+// but some signal handlers run on thread stack, and could have arbitrarily
+// little space left (so we don't want to make this number too large).
+const int kStackConsumptionUpperLimit = 8192;
+
+// Returns a mangled name nested to the given depth.
+static std::string NestedMangledName(int depth) {
+ std::string mangled_name = "_Z1a";
+ if (depth > 0) {
+ mangled_name += "IXL";
+ mangled_name += NestedMangledName(depth - 1);
+ mangled_name += "EEE";
+ }
+ return mangled_name;
+}
+
+TEST(Demangle, DemangleStackConsumption) {
+ // Measure stack consumption of Demangle for nested mangled names of varying
+ // depth. Since Demangle is implemented as a recursive descent parser,
+ // stack consumption will grow as the nesting depth increases. By measuring
+ // the stack consumption for increasing depths, we can see the growing
+ // impact of any stack-saving changes made to the code for Demangle.
+ int stack_consumed = 0;
+
+ const char *demangled =
+ DemangleStackConsumption("_Z6foobarv", &stack_consumed);
+ EXPECT_STREQ("foobar()", demangled);
+ EXPECT_GT(stack_consumed, 0);
+ EXPECT_LT(stack_consumed, kStackConsumptionUpperLimit);
+
+ const std::string nested_mangled_name0 = NestedMangledName(0);
+ demangled = DemangleStackConsumption(nested_mangled_name0.c_str(),
+ &stack_consumed);
+ EXPECT_STREQ("a", demangled);
+ EXPECT_GT(stack_consumed, 0);
+ EXPECT_LT(stack_consumed, kStackConsumptionUpperLimit);
+
+ const std::string nested_mangled_name1 = NestedMangledName(1);
+ demangled = DemangleStackConsumption(nested_mangled_name1.c_str(),
+ &stack_consumed);
+ EXPECT_STREQ("a<>", demangled);
+ EXPECT_GT(stack_consumed, 0);
+ EXPECT_LT(stack_consumed, kStackConsumptionUpperLimit);
+
+ const std::string nested_mangled_name2 = NestedMangledName(2);
+ demangled = DemangleStackConsumption(nested_mangled_name2.c_str(),
+ &stack_consumed);
+ EXPECT_STREQ("a<>", demangled);
+ EXPECT_GT(stack_consumed, 0);
+ EXPECT_LT(stack_consumed, kStackConsumptionUpperLimit);
+
+ const std::string nested_mangled_name3 = NestedMangledName(3);
+ demangled = DemangleStackConsumption(nested_mangled_name3.c_str(),
+ &stack_consumed);
+ EXPECT_STREQ("a<>", demangled);
+ EXPECT_GT(stack_consumed, 0);
+ EXPECT_LT(stack_consumed, kStackConsumptionUpperLimit);
+}
+
+#endif // Stack consumption tests
+
+static void TestOnInput(const char* input) {
+ static const int kOutSize = 1048576;
+ auto out = absl::make_unique<char[]>(kOutSize);
+ Demangle(input, out.get(), kOutSize);
+}
+
+TEST(DemangleRegression, NegativeLength) {
+ TestOnInput("_ZZn4");
+}
+
+TEST(DemangleRegression, DeeplyNestedArrayType) {
+ const int depth = 100000;
+ std::string data = "_ZStI";
+ data.reserve(data.size() + 3 * depth + 1);
+ for (int i = 0; i < depth; i++) {
+ data += "A1_";
+ }
+ TestOnInput(data.c_str());
+}
+
+} // namespace
+} // namespace debugging_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/debugging/internal/elf_mem_image.cc b/third_party/abseil/src/absl/debugging/internal/elf_mem_image.cc
new file mode 100644
index 0000000..24cc013
--- /dev/null
+++ b/third_party/abseil/src/absl/debugging/internal/elf_mem_image.cc
@@ -0,0 +1,382 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Allow dynamic symbol lookup in an in-memory Elf image.
+//
+
+#include "absl/debugging/internal/elf_mem_image.h"
+
+#ifdef ABSL_HAVE_ELF_MEM_IMAGE // defined in elf_mem_image.h
+
+#include <string.h>
+#include <cassert>
+#include <cstddef>
+#include "absl/base/internal/raw_logging.h"
+
+// From binutils/include/elf/common.h (this doesn't appear to be documented
+// anywhere else).
+//
+// /* This flag appears in a Versym structure. It means that the symbol
+// is hidden, and is only visible with an explicit version number.
+// This is a GNU extension. */
+// #define VERSYM_HIDDEN 0x8000
+//
+// /* This is the mask for the rest of the Versym information. */
+// #define VERSYM_VERSION 0x7fff
+
+#define VERSYM_VERSION 0x7fff
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace debugging_internal {
+
+namespace {
+
+#if __WORDSIZE == 32
+const int kElfClass = ELFCLASS32;
+int ElfBind(const ElfW(Sym) *symbol) { return ELF32_ST_BIND(symbol->st_info); }
+int ElfType(const ElfW(Sym) *symbol) { return ELF32_ST_TYPE(symbol->st_info); }
+#elif __WORDSIZE == 64
+const int kElfClass = ELFCLASS64;
+int ElfBind(const ElfW(Sym) *symbol) { return ELF64_ST_BIND(symbol->st_info); }
+int ElfType(const ElfW(Sym) *symbol) { return ELF64_ST_TYPE(symbol->st_info); }
+#else
+const int kElfClass = -1;
+int ElfBind(const ElfW(Sym) *) {
+ ABSL_RAW_LOG(FATAL, "Unexpected word size");
+ return 0;
+}
+int ElfType(const ElfW(Sym) *) {
+ ABSL_RAW_LOG(FATAL, "Unexpected word size");
+ return 0;
+}
+#endif
+
+// Extract an element from one of the ELF tables, cast it to desired type.
+// This is just a simple arithmetic and a glorified cast.
+// Callers are responsible for bounds checking.
+template <typename T>
+const T *GetTableElement(const ElfW(Ehdr) * ehdr, ElfW(Off) table_offset,
+ ElfW(Word) element_size, size_t index) {
+ return reinterpret_cast<const T*>(reinterpret_cast<const char *>(ehdr)
+ + table_offset
+ + index * element_size);
+}
+
+} // namespace
+
+// The value of this variable doesn't matter; it's used only for its
+// unique address.
+const int ElfMemImage::kInvalidBaseSentinel = 0;
+
+ElfMemImage::ElfMemImage(const void *base) {
+ ABSL_RAW_CHECK(base != kInvalidBase, "bad pointer");
+ Init(base);
+}
+
+int ElfMemImage::GetNumSymbols() const {
+ if (!hash_) {
+ return 0;
+ }
+ // See http://www.caldera.com/developers/gabi/latest/ch5.dynamic.html#hash
+ return hash_[1];
+}
+
+const ElfW(Sym) *ElfMemImage::GetDynsym(int index) const {
+ ABSL_RAW_CHECK(index < GetNumSymbols(), "index out of range");
+ return dynsym_ + index;
+}
+
+const ElfW(Versym) *ElfMemImage::GetVersym(int index) const {
+ ABSL_RAW_CHECK(index < GetNumSymbols(), "index out of range");
+ return versym_ + index;
+}
+
+const ElfW(Phdr) *ElfMemImage::GetPhdr(int index) const {
+ ABSL_RAW_CHECK(index < ehdr_->e_phnum, "index out of range");
+ return GetTableElement<ElfW(Phdr)>(ehdr_,
+ ehdr_->e_phoff,
+ ehdr_->e_phentsize,
+ index);
+}
+
+const char *ElfMemImage::GetDynstr(ElfW(Word) offset) const {
+ ABSL_RAW_CHECK(offset < strsize_, "offset out of range");
+ return dynstr_ + offset;
+}
+
+const void *ElfMemImage::GetSymAddr(const ElfW(Sym) *sym) const {
+ if (sym->st_shndx == SHN_UNDEF || sym->st_shndx >= SHN_LORESERVE) {
+ // Symbol corresponds to "special" (e.g. SHN_ABS) section.
+ return reinterpret_cast<const void *>(sym->st_value);
+ }
+ ABSL_RAW_CHECK(link_base_ < sym->st_value, "symbol out of range");
+ return GetTableElement<char>(ehdr_, 0, 1, sym->st_value - link_base_);
+}
+
+const ElfW(Verdef) *ElfMemImage::GetVerdef(int index) const {
+ ABSL_RAW_CHECK(0 <= index && static_cast<size_t>(index) <= verdefnum_,
+ "index out of range");
+ const ElfW(Verdef) *version_definition = verdef_;
+ while (version_definition->vd_ndx < index && version_definition->vd_next) {
+ const char *const version_definition_as_char =
+ reinterpret_cast<const char *>(version_definition);
+ version_definition =
+ reinterpret_cast<const ElfW(Verdef) *>(version_definition_as_char +
+ version_definition->vd_next);
+ }
+ return version_definition->vd_ndx == index ? version_definition : nullptr;
+}
+
+const ElfW(Verdaux) *ElfMemImage::GetVerdefAux(
+ const ElfW(Verdef) *verdef) const {
+ return reinterpret_cast<const ElfW(Verdaux) *>(verdef+1);
+}
+
+const char *ElfMemImage::GetVerstr(ElfW(Word) offset) const {
+ ABSL_RAW_CHECK(offset < strsize_, "offset out of range");
+ return dynstr_ + offset;
+}
+
+void ElfMemImage::Init(const void *base) {
+ ehdr_ = nullptr;
+ dynsym_ = nullptr;
+ dynstr_ = nullptr;
+ versym_ = nullptr;
+ verdef_ = nullptr;
+ hash_ = nullptr;
+ strsize_ = 0;
+ verdefnum_ = 0;
+ link_base_ = ~0L; // Sentinel: PT_LOAD .p_vaddr can't possibly be this.
+ if (!base) {
+ return;
+ }
+ const char *const base_as_char = reinterpret_cast<const char *>(base);
+ if (base_as_char[EI_MAG0] != ELFMAG0 || base_as_char[EI_MAG1] != ELFMAG1 ||
+ base_as_char[EI_MAG2] != ELFMAG2 || base_as_char[EI_MAG3] != ELFMAG3) {
+ assert(false);
+ return;
+ }
+ int elf_class = base_as_char[EI_CLASS];
+ if (elf_class != kElfClass) {
+ assert(false);
+ return;
+ }
+ switch (base_as_char[EI_DATA]) {
+ case ELFDATA2LSB: {
+ if (__LITTLE_ENDIAN != __BYTE_ORDER) {
+ assert(false);
+ return;
+ }
+ break;
+ }
+ case ELFDATA2MSB: {
+ if (__BIG_ENDIAN != __BYTE_ORDER) {
+ assert(false);
+ return;
+ }
+ break;
+ }
+ default: {
+ assert(false);
+ return;
+ }
+ }
+
+ ehdr_ = reinterpret_cast<const ElfW(Ehdr) *>(base);
+ const ElfW(Phdr) *dynamic_program_header = nullptr;
+ for (int i = 0; i < ehdr_->e_phnum; ++i) {
+ const ElfW(Phdr) *const program_header = GetPhdr(i);
+ switch (program_header->p_type) {
+ case PT_LOAD:
+ if (!~link_base_) {
+ link_base_ = program_header->p_vaddr;
+ }
+ break;
+ case PT_DYNAMIC:
+ dynamic_program_header = program_header;
+ break;
+ }
+ }
+ if (!~link_base_ || !dynamic_program_header) {
+ assert(false);
+ // Mark this image as not present. Can not recur infinitely.
+ Init(nullptr);
+ return;
+ }
+ ptrdiff_t relocation =
+ base_as_char - reinterpret_cast<const char *>(link_base_);
+ ElfW(Dyn) *dynamic_entry =
+ reinterpret_cast<ElfW(Dyn) *>(dynamic_program_header->p_vaddr +
+ relocation);
+ for (; dynamic_entry->d_tag != DT_NULL; ++dynamic_entry) {
+ const ElfW(Xword) value = dynamic_entry->d_un.d_val + relocation;
+ switch (dynamic_entry->d_tag) {
+ case DT_HASH:
+ hash_ = reinterpret_cast<ElfW(Word) *>(value);
+ break;
+ case DT_SYMTAB:
+ dynsym_ = reinterpret_cast<ElfW(Sym) *>(value);
+ break;
+ case DT_STRTAB:
+ dynstr_ = reinterpret_cast<const char *>(value);
+ break;
+ case DT_VERSYM:
+ versym_ = reinterpret_cast<ElfW(Versym) *>(value);
+ break;
+ case DT_VERDEF:
+ verdef_ = reinterpret_cast<ElfW(Verdef) *>(value);
+ break;
+ case DT_VERDEFNUM:
+ verdefnum_ = dynamic_entry->d_un.d_val;
+ break;
+ case DT_STRSZ:
+ strsize_ = dynamic_entry->d_un.d_val;
+ break;
+ default:
+ // Unrecognized entries explicitly ignored.
+ break;
+ }
+ }
+ if (!hash_ || !dynsym_ || !dynstr_ || !versym_ ||
+ !verdef_ || !verdefnum_ || !strsize_) {
+ assert(false); // invalid VDSO
+ // Mark this image as not present. Can not recur infinitely.
+ Init(nullptr);
+ return;
+ }
+}
+
+bool ElfMemImage::LookupSymbol(const char *name,
+ const char *version,
+ int type,
+ SymbolInfo *info_out) const {
+ for (const SymbolInfo& info : *this) {
+ if (strcmp(info.name, name) == 0 && strcmp(info.version, version) == 0 &&
+ ElfType(info.symbol) == type) {
+ if (info_out) {
+ *info_out = info;
+ }
+ return true;
+ }
+ }
+ return false;
+}
+
+bool ElfMemImage::LookupSymbolByAddress(const void *address,
+ SymbolInfo *info_out) const {
+ for (const SymbolInfo& info : *this) {
+ const char *const symbol_start =
+ reinterpret_cast<const char *>(info.address);
+ const char *const symbol_end = symbol_start + info.symbol->st_size;
+ if (symbol_start <= address && address < symbol_end) {
+ if (info_out) {
+ // Client wants to know details for that symbol (the usual case).
+ if (ElfBind(info.symbol) == STB_GLOBAL) {
+ // Strong symbol; just return it.
+ *info_out = info;
+ return true;
+ } else {
+ // Weak or local. Record it, but keep looking for a strong one.
+ *info_out = info;
+ }
+ } else {
+ // Client only cares if there is an overlapping symbol.
+ return true;
+ }
+ }
+ }
+ return false;
+}
+
+ElfMemImage::SymbolIterator::SymbolIterator(const void *const image, int index)
+ : index_(index), image_(image) {
+}
+
+const ElfMemImage::SymbolInfo *ElfMemImage::SymbolIterator::operator->() const {
+ return &info_;
+}
+
+const ElfMemImage::SymbolInfo& ElfMemImage::SymbolIterator::operator*() const {
+ return info_;
+}
+
+bool ElfMemImage::SymbolIterator::operator==(const SymbolIterator &rhs) const {
+ return this->image_ == rhs.image_ && this->index_ == rhs.index_;
+}
+
+bool ElfMemImage::SymbolIterator::operator!=(const SymbolIterator &rhs) const {
+ return !(*this == rhs);
+}
+
+ElfMemImage::SymbolIterator &ElfMemImage::SymbolIterator::operator++() {
+ this->Update(1);
+ return *this;
+}
+
+ElfMemImage::SymbolIterator ElfMemImage::begin() const {
+ SymbolIterator it(this, 0);
+ it.Update(0);
+ return it;
+}
+
+ElfMemImage::SymbolIterator ElfMemImage::end() const {
+ return SymbolIterator(this, GetNumSymbols());
+}
+
+void ElfMemImage::SymbolIterator::Update(int increment) {
+ const ElfMemImage *image = reinterpret_cast<const ElfMemImage *>(image_);
+ ABSL_RAW_CHECK(image->IsPresent() || increment == 0, "");
+ if (!image->IsPresent()) {
+ return;
+ }
+ index_ += increment;
+ if (index_ >= image->GetNumSymbols()) {
+ index_ = image->GetNumSymbols();
+ return;
+ }
+ const ElfW(Sym) *symbol = image->GetDynsym(index_);
+ const ElfW(Versym) *version_symbol = image->GetVersym(index_);
+ ABSL_RAW_CHECK(symbol && version_symbol, "");
+ const char *const symbol_name = image->GetDynstr(symbol->st_name);
+ const ElfW(Versym) version_index = version_symbol[0] & VERSYM_VERSION;
+ const ElfW(Verdef) *version_definition = nullptr;
+ const char *version_name = "";
+ if (symbol->st_shndx == SHN_UNDEF) {
+ // Undefined symbols reference DT_VERNEED, not DT_VERDEF, and
+ // version_index could well be greater than verdefnum_, so calling
+ // GetVerdef(version_index) may trigger assertion.
+ } else {
+ version_definition = image->GetVerdef(version_index);
+ }
+ if (version_definition) {
+ // I am expecting 1 or 2 auxiliary entries: 1 for the version itself,
+ // optional 2nd if the version has a parent.
+ ABSL_RAW_CHECK(
+ version_definition->vd_cnt == 1 || version_definition->vd_cnt == 2,
+ "wrong number of entries");
+ const ElfW(Verdaux) *version_aux = image->GetVerdefAux(version_definition);
+ version_name = image->GetVerstr(version_aux->vda_name);
+ }
+ info_.name = symbol_name;
+ info_.version = version_name;
+ info_.address = image->GetSymAddr(symbol);
+ info_.symbol = symbol;
+}
+
+} // namespace debugging_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_HAVE_ELF_MEM_IMAGE
diff --git a/third_party/abseil/src/absl/debugging/internal/elf_mem_image.h b/third_party/abseil/src/absl/debugging/internal/elf_mem_image.h
new file mode 100644
index 0000000..46bfade
--- /dev/null
+++ b/third_party/abseil/src/absl/debugging/internal/elf_mem_image.h
@@ -0,0 +1,134 @@
+/*
+ * Copyright 2017 The Abseil Authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// Allow dynamic symbol lookup for in-memory Elf images.
+
+#ifndef ABSL_DEBUGGING_INTERNAL_ELF_MEM_IMAGE_H_
+#define ABSL_DEBUGGING_INTERNAL_ELF_MEM_IMAGE_H_
+
+// Including this will define the __GLIBC__ macro if glibc is being
+// used.
+#include <climits>
+
+#include "absl/base/config.h"
+
+// Maybe one day we can rewrite this file not to require the elf
+// symbol extensions in glibc, but for right now we need them.
+#ifdef ABSL_HAVE_ELF_MEM_IMAGE
+#error ABSL_HAVE_ELF_MEM_IMAGE cannot be directly set
+#endif
+
+#if defined(__ELF__) && defined(__GLIBC__) && !defined(__native_client__) && \
+ !defined(__asmjs__) && !defined(__wasm__)
+#define ABSL_HAVE_ELF_MEM_IMAGE 1
+#endif
+
+#ifdef ABSL_HAVE_ELF_MEM_IMAGE
+
+#include <link.h> // for ElfW
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace debugging_internal {
+
+// An in-memory ELF image (may not exist on disk).
+class ElfMemImage {
+ private:
+ // Sentinel: there could never be an elf image at &kInvalidBaseSentinel.
+ static const int kInvalidBaseSentinel;
+
+ public:
+ // Sentinel: there could never be an elf image at this address.
+ static constexpr const void *const kInvalidBase =
+ static_cast<const void*>(&kInvalidBaseSentinel);
+
+ // Information about a single vdso symbol.
+ // All pointers are into .dynsym, .dynstr, or .text of the VDSO.
+ // Do not free() them or modify through them.
+ struct SymbolInfo {
+ const char *name; // E.g. "__vdso_getcpu"
+ const char *version; // E.g. "LINUX_2.6", could be ""
+ // for unversioned symbol.
+ const void *address; // Relocated symbol address.
+ const ElfW(Sym) *symbol; // Symbol in the dynamic symbol table.
+ };
+
+ // Supports iteration over all dynamic symbols.
+ class SymbolIterator {
+ public:
+ friend class ElfMemImage;
+ const SymbolInfo *operator->() const;
+ const SymbolInfo &operator*() const;
+ SymbolIterator& operator++();
+ bool operator!=(const SymbolIterator &rhs) const;
+ bool operator==(const SymbolIterator &rhs) const;
+ private:
+ SymbolIterator(const void *const image, int index);
+ void Update(int incr);
+ SymbolInfo info_;
+ int index_;
+ const void *const image_;
+ };
+
+
+ explicit ElfMemImage(const void *base);
+ void Init(const void *base);
+ bool IsPresent() const { return ehdr_ != nullptr; }
+ const ElfW(Phdr)* GetPhdr(int index) const;
+ const ElfW(Sym)* GetDynsym(int index) const;
+ const ElfW(Versym)* GetVersym(int index) const;
+ const ElfW(Verdef)* GetVerdef(int index) const;
+ const ElfW(Verdaux)* GetVerdefAux(const ElfW(Verdef) *verdef) const;
+ const char* GetDynstr(ElfW(Word) offset) const;
+ const void* GetSymAddr(const ElfW(Sym) *sym) const;
+ const char* GetVerstr(ElfW(Word) offset) const;
+ int GetNumSymbols() const;
+
+ SymbolIterator begin() const;
+ SymbolIterator end() const;
+
+ // Look up versioned dynamic symbol in the image.
+ // Returns false if image is not present, or doesn't contain given
+ // symbol/version/type combination.
+ // If info_out is non-null, additional details are filled in.
+ bool LookupSymbol(const char *name, const char *version,
+ int symbol_type, SymbolInfo *info_out) const;
+
+ // Find info about symbol (if any) which overlaps given address.
+ // Returns true if symbol was found; false if image isn't present
+ // or doesn't have a symbol overlapping given address.
+ // If info_out is non-null, additional details are filled in.
+ bool LookupSymbolByAddress(const void *address, SymbolInfo *info_out) const;
+
+ private:
+ const ElfW(Ehdr) *ehdr_;
+ const ElfW(Sym) *dynsym_;
+ const ElfW(Versym) *versym_;
+ const ElfW(Verdef) *verdef_;
+ const ElfW(Word) *hash_;
+ const char *dynstr_;
+ size_t strsize_;
+ size_t verdefnum_;
+ ElfW(Addr) link_base_; // Link-time base (p_vaddr of first PT_LOAD).
+};
+
+} // namespace debugging_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_HAVE_ELF_MEM_IMAGE
+
+#endif // ABSL_DEBUGGING_INTERNAL_ELF_MEM_IMAGE_H_
diff --git a/third_party/abseil/src/absl/debugging/internal/examine_stack.cc b/third_party/abseil/src/absl/debugging/internal/examine_stack.cc
new file mode 100644
index 0000000..6e5ff1f
--- /dev/null
+++ b/third_party/abseil/src/absl/debugging/internal/examine_stack.cc
@@ -0,0 +1,187 @@
+//
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+#include "absl/debugging/internal/examine_stack.h"
+
+#ifndef _WIN32
+#include <unistd.h>
+#endif
+
+#ifdef __APPLE__
+#include <sys/ucontext.h>
+#endif
+
+#include <csignal>
+#include <cstdio>
+
+#include "absl/base/attributes.h"
+#include "absl/base/internal/raw_logging.h"
+#include "absl/base/macros.h"
+#include "absl/debugging/stacktrace.h"
+#include "absl/debugging/symbolize.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace debugging_internal {
+
+// Returns the program counter from signal context, nullptr if
+// unknown. vuc is a ucontext_t*. We use void* to avoid the use of
+// ucontext_t on non-POSIX systems.
+void* GetProgramCounter(void* vuc) {
+#ifdef __linux__
+ if (vuc != nullptr) {
+ ucontext_t* context = reinterpret_cast<ucontext_t*>(vuc);
+#if defined(__aarch64__)
+ return reinterpret_cast<void*>(context->uc_mcontext.pc);
+#elif defined(__arm__)
+ return reinterpret_cast<void*>(context->uc_mcontext.arm_pc);
+#elif defined(__i386__)
+ if (14 < ABSL_ARRAYSIZE(context->uc_mcontext.gregs))
+ return reinterpret_cast<void*>(context->uc_mcontext.gregs[14]);
+#elif defined(__mips__)
+ return reinterpret_cast<void*>(context->uc_mcontext.pc);
+#elif defined(__powerpc64__)
+ return reinterpret_cast<void*>(context->uc_mcontext.gp_regs[32]);
+#elif defined(__powerpc__)
+ return reinterpret_cast<void*>(context->uc_mcontext.regs->nip);
+#elif defined(__riscv)
+ return reinterpret_cast<void*>(context->uc_mcontext.__gregs[REG_PC]);
+#elif defined(__s390__) && !defined(__s390x__)
+ return reinterpret_cast<void*>(context->uc_mcontext.psw.addr & 0x7fffffff);
+#elif defined(__s390__) && defined(__s390x__)
+ return reinterpret_cast<void*>(context->uc_mcontext.psw.addr);
+#elif defined(__x86_64__)
+ if (16 < ABSL_ARRAYSIZE(context->uc_mcontext.gregs))
+ return reinterpret_cast<void*>(context->uc_mcontext.gregs[16]);
+#else
+#error "Undefined Architecture."
+#endif
+ }
+#elif defined(__APPLE__)
+ if (vuc != nullptr) {
+ ucontext_t* signal_ucontext = reinterpret_cast<ucontext_t*>(vuc);
+#if defined(__aarch64__)
+ return reinterpret_cast<void*>(
+ __darwin_arm_thread_state64_get_pc(signal_ucontext->uc_mcontext->__ss));
+#elif defined(__arm__)
+#if __DARWIN_UNIX03
+ return reinterpret_cast<void*>(signal_ucontext->uc_mcontext->__ss.__pc);
+#else
+ return reinterpret_cast<void*>(signal_ucontext->uc_mcontext->ss.pc);
+#endif
+#elif defined(__i386__)
+#if __DARWIN_UNIX03
+ return reinterpret_cast<void*>(signal_ucontext->uc_mcontext->__ss.__eip);
+#else
+ return reinterpret_cast<void*>(signal_ucontext->uc_mcontext->ss.eip);
+#endif
+#elif defined(__x86_64__)
+#if __DARWIN_UNIX03
+ return reinterpret_cast<void*>(signal_ucontext->uc_mcontext->__ss.__rip);
+#else
+ return reinterpret_cast<void*>(signal_ucontext->uc_mcontext->ss.rip);
+#endif
+#endif
+ }
+#elif defined(__akaros__)
+ auto* ctx = reinterpret_cast<struct user_context*>(vuc);
+ return reinterpret_cast<void*>(get_user_ctx_pc(ctx));
+#endif
+ static_cast<void>(vuc);
+ return nullptr;
+}
+
+// The %p field width for printf() functions is two characters per byte,
+// and two extra for the leading "0x".
+static constexpr int kPrintfPointerFieldWidth = 2 + 2 * sizeof(void*);
+
+// Print a program counter, its stack frame size, and its symbol name.
+// Note that there is a separate symbolize_pc argument. Return addresses may be
+// at the end of the function, and this allows the caller to back up from pc if
+// appropriate.
+static void DumpPCAndFrameSizeAndSymbol(void (*writerfn)(const char*, void*),
+ void* writerfn_arg, void* pc,
+ void* symbolize_pc, int framesize,
+ const char* const prefix) {
+ char tmp[1024];
+ const char* symbol = "(unknown)";
+ if (absl::Symbolize(symbolize_pc, tmp, sizeof(tmp))) {
+ symbol = tmp;
+ }
+ char buf[1024];
+ if (framesize <= 0) {
+ snprintf(buf, sizeof(buf), "%s@ %*p (unknown) %s\n", prefix,
+ kPrintfPointerFieldWidth, pc, symbol);
+ } else {
+ snprintf(buf, sizeof(buf), "%s@ %*p %9d %s\n", prefix,
+ kPrintfPointerFieldWidth, pc, framesize, symbol);
+ }
+ writerfn(buf, writerfn_arg);
+}
+
+// Print a program counter and the corresponding stack frame size.
+static void DumpPCAndFrameSize(void (*writerfn)(const char*, void*),
+ void* writerfn_arg, void* pc, int framesize,
+ const char* const prefix) {
+ char buf[100];
+ if (framesize <= 0) {
+ snprintf(buf, sizeof(buf), "%s@ %*p (unknown)\n", prefix,
+ kPrintfPointerFieldWidth, pc);
+ } else {
+ snprintf(buf, sizeof(buf), "%s@ %*p %9d\n", prefix,
+ kPrintfPointerFieldWidth, pc, framesize);
+ }
+ writerfn(buf, writerfn_arg);
+}
+
+void DumpPCAndFrameSizesAndStackTrace(
+ void* pc, void* const stack[], int frame_sizes[], int depth,
+ int min_dropped_frames, bool symbolize_stacktrace,
+ void (*writerfn)(const char*, void*), void* writerfn_arg) {
+ if (pc != nullptr) {
+ // We don't know the stack frame size for PC, use 0.
+ if (symbolize_stacktrace) {
+ DumpPCAndFrameSizeAndSymbol(writerfn, writerfn_arg, pc, pc, 0, "PC: ");
+ } else {
+ DumpPCAndFrameSize(writerfn, writerfn_arg, pc, 0, "PC: ");
+ }
+ }
+ for (int i = 0; i < depth; i++) {
+ if (symbolize_stacktrace) {
+ // Pass the previous address of pc as the symbol address because pc is a
+ // return address, and an overrun may occur when the function ends with a
+ // call to a function annotated noreturn (e.g. CHECK). Note that we don't
+ // do this for pc above, as the adjustment is only correct for return
+ // addresses.
+ DumpPCAndFrameSizeAndSymbol(writerfn, writerfn_arg, stack[i],
+ reinterpret_cast<char*>(stack[i]) - 1,
+ frame_sizes[i], " ");
+ } else {
+ DumpPCAndFrameSize(writerfn, writerfn_arg, stack[i], frame_sizes[i],
+ " ");
+ }
+ }
+ if (min_dropped_frames > 0) {
+ char buf[100];
+ snprintf(buf, sizeof(buf), " @ ... and at least %d more frames\n",
+ min_dropped_frames);
+ writerfn(buf, writerfn_arg);
+ }
+}
+
+} // namespace debugging_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/debugging/internal/examine_stack.h b/third_party/abseil/src/absl/debugging/internal/examine_stack.h
new file mode 100644
index 0000000..3933691
--- /dev/null
+++ b/third_party/abseil/src/absl/debugging/internal/examine_stack.h
@@ -0,0 +1,42 @@
+//
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+#ifndef ABSL_DEBUGGING_INTERNAL_EXAMINE_STACK_H_
+#define ABSL_DEBUGGING_INTERNAL_EXAMINE_STACK_H_
+
+#include "absl/base/config.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace debugging_internal {
+
+// Returns the program counter from signal context, or nullptr if
+// unknown. `vuc` is a ucontext_t*. We use void* to avoid the use of
+// ucontext_t on non-POSIX systems.
+void* GetProgramCounter(void* vuc);
+
+// Uses `writerfn` to dump the program counter, stack trace, and stack
+// frame sizes.
+void DumpPCAndFrameSizesAndStackTrace(
+ void* pc, void* const stack[], int frame_sizes[], int depth,
+ int min_dropped_frames, bool symbolize_stacktrace,
+ void (*writerfn)(const char*, void*), void* writerfn_arg);
+
+} // namespace debugging_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_DEBUGGING_INTERNAL_EXAMINE_STACK_H_
diff --git a/third_party/abseil/src/absl/debugging/internal/stack_consumption.cc b/third_party/abseil/src/absl/debugging/internal/stack_consumption.cc
new file mode 100644
index 0000000..e3dd51c
--- /dev/null
+++ b/third_party/abseil/src/absl/debugging/internal/stack_consumption.cc
@@ -0,0 +1,185 @@
+//
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/debugging/internal/stack_consumption.h"
+
+#ifdef ABSL_INTERNAL_HAVE_DEBUGGING_STACK_CONSUMPTION
+
+#include <signal.h>
+#include <sys/mman.h>
+#include <unistd.h>
+
+#include <string.h>
+
+#include "absl/base/attributes.h"
+#include "absl/base/internal/raw_logging.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace debugging_internal {
+namespace {
+
+// This code requires that we know the direction in which the stack
+// grows. It is commonly believed that this can be detected by putting
+// a variable on the stack and then passing its address to a function
+// that compares the address of this variable to the address of a
+// variable on the function's own stack. However, this is unspecified
+// behavior in C++: If two pointers p and q of the same type point to
+// different objects that are not members of the same object or
+// elements of the same array or to different functions, or if only
+// one of them is null, the results of p<q, p>q, p<=q, and p>=q are
+// unspecified. Therefore, instead we hardcode the direction of the
+// stack on platforms we know about.
+#if defined(__i386__) || defined(__x86_64__) || defined(__ppc__) || \
+ defined(__aarch64__)
+constexpr bool kStackGrowsDown = true;
+#else
+#error Need to define kStackGrowsDown
+#endif
+
+// To measure the stack footprint of some code, we create a signal handler
+// (for SIGUSR2 say) that exercises this code on an alternate stack. This
+// alternate stack is initialized to some known pattern (0x55, 0x55, 0x55,
+// ...). We then self-send this signal, and after the signal handler returns,
+// look at the alternate stack buffer to see what portion has been touched.
+//
+// This trick gives us the the stack footprint of the signal handler. But the
+// signal handler, even before the code for it is exercised, consumes some
+// stack already. We however only want the stack usage of the code inside the
+// signal handler. To measure this accurately, we install two signal handlers:
+// one that does nothing and just returns, and the user-provided signal
+// handler. The difference between the stack consumption of these two signals
+// handlers should give us the stack foorprint of interest.
+
+void EmptySignalHandler(int) {}
+
+// This is arbitrary value, and could be increase further, at the cost of
+// memset()ting it all to known sentinel value.
+constexpr int kAlternateStackSize = 64 << 10; // 64KiB
+
+constexpr int kSafetyMargin = 32;
+constexpr char kAlternateStackFillValue = 0x55;
+
+// These helper functions look at the alternate stack buffer, and figure
+// out what portion of this buffer has been touched - this is the stack
+// consumption of the signal handler running on this alternate stack.
+// This function will return -1 if the alternate stack buffer has not been
+// touched. It will abort the program if the buffer has overflowed or is about
+// to overflow.
+int GetStackConsumption(const void* const altstack) {
+ const char* begin;
+ int increment;
+ if (kStackGrowsDown) {
+ begin = reinterpret_cast<const char*>(altstack);
+ increment = 1;
+ } else {
+ begin = reinterpret_cast<const char*>(altstack) + kAlternateStackSize - 1;
+ increment = -1;
+ }
+
+ for (int usage_count = kAlternateStackSize; usage_count > 0; --usage_count) {
+ if (*begin != kAlternateStackFillValue) {
+ ABSL_RAW_CHECK(usage_count <= kAlternateStackSize - kSafetyMargin,
+ "Buffer has overflowed or is about to overflow");
+ return usage_count;
+ }
+ begin += increment;
+ }
+
+ ABSL_RAW_LOG(FATAL, "Unreachable code");
+ return -1;
+}
+
+} // namespace
+
+int GetSignalHandlerStackConsumption(void (*signal_handler)(int)) {
+ // The alt-signal-stack cannot be heap allocated because there is a
+ // bug in glibc-2.2 where some signal handler setup code looks at the
+ // current stack pointer to figure out what thread is currently running.
+ // Therefore, the alternate stack must be allocated from the main stack
+ // itself.
+ void* altstack = mmap(nullptr, kAlternateStackSize, PROT_READ | PROT_WRITE,
+ MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+ ABSL_RAW_CHECK(altstack != MAP_FAILED, "mmap() failed");
+
+ // Set up the alt-signal-stack (and save the older one).
+ stack_t sigstk;
+ memset(&sigstk, 0, sizeof(sigstk));
+ sigstk.ss_sp = altstack;
+ sigstk.ss_size = kAlternateStackSize;
+ sigstk.ss_flags = 0;
+ stack_t old_sigstk;
+ memset(&old_sigstk, 0, sizeof(old_sigstk));
+ ABSL_RAW_CHECK(sigaltstack(&sigstk, &old_sigstk) == 0,
+ "sigaltstack() failed");
+
+ // Set up SIGUSR1 and SIGUSR2 signal handlers (and save the older ones).
+ struct sigaction sa;
+ memset(&sa, 0, sizeof(sa));
+ struct sigaction old_sa1, old_sa2;
+ sigemptyset(&sa.sa_mask);
+ sa.sa_flags = SA_ONSTACK;
+
+ // SIGUSR1 maps to EmptySignalHandler.
+ sa.sa_handler = EmptySignalHandler;
+ ABSL_RAW_CHECK(sigaction(SIGUSR1, &sa, &old_sa1) == 0, "sigaction() failed");
+
+ // SIGUSR2 maps to signal_handler.
+ sa.sa_handler = signal_handler;
+ ABSL_RAW_CHECK(sigaction(SIGUSR2, &sa, &old_sa2) == 0, "sigaction() failed");
+
+ // Send SIGUSR1 signal and measure the stack consumption of the empty
+ // signal handler.
+ // The first signal might use more stack space. Run once and ignore the
+ // results to get that out of the way.
+ ABSL_RAW_CHECK(kill(getpid(), SIGUSR1) == 0, "kill() failed");
+
+ memset(altstack, kAlternateStackFillValue, kAlternateStackSize);
+ ABSL_RAW_CHECK(kill(getpid(), SIGUSR1) == 0, "kill() failed");
+ int base_stack_consumption = GetStackConsumption(altstack);
+
+ // Send SIGUSR2 signal and measure the stack consumption of signal_handler.
+ ABSL_RAW_CHECK(kill(getpid(), SIGUSR2) == 0, "kill() failed");
+ int signal_handler_stack_consumption = GetStackConsumption(altstack);
+
+ // Now restore the old alt-signal-stack and signal handlers.
+ if (old_sigstk.ss_sp == nullptr && old_sigstk.ss_size == 0 &&
+ (old_sigstk.ss_flags & SS_DISABLE)) {
+ // https://git.musl-libc.org/cgit/musl/commit/src/signal/sigaltstack.c?id=7829f42a2c8944555439380498ab8b924d0f2070
+ // The original stack has ss_size==0 and ss_flags==SS_DISABLE, but some
+ // versions of musl have a bug that rejects ss_size==0. Work around this by
+ // setting ss_size to MINSIGSTKSZ, which should be ignored by the kernel
+ // when SS_DISABLE is set.
+ old_sigstk.ss_size = MINSIGSTKSZ;
+ }
+ ABSL_RAW_CHECK(sigaltstack(&old_sigstk, nullptr) == 0,
+ "sigaltstack() failed");
+ ABSL_RAW_CHECK(sigaction(SIGUSR1, &old_sa1, nullptr) == 0,
+ "sigaction() failed");
+ ABSL_RAW_CHECK(sigaction(SIGUSR2, &old_sa2, nullptr) == 0,
+ "sigaction() failed");
+
+ ABSL_RAW_CHECK(munmap(altstack, kAlternateStackSize) == 0, "munmap() failed");
+ if (signal_handler_stack_consumption != -1 && base_stack_consumption != -1) {
+ return signal_handler_stack_consumption - base_stack_consumption;
+ }
+ return -1;
+}
+
+} // namespace debugging_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_INTERNAL_HAVE_DEBUGGING_STACK_CONSUMPTION
diff --git a/third_party/abseil/src/absl/debugging/internal/stack_consumption.h b/third_party/abseil/src/absl/debugging/internal/stack_consumption.h
new file mode 100644
index 0000000..2b5e715
--- /dev/null
+++ b/third_party/abseil/src/absl/debugging/internal/stack_consumption.h
@@ -0,0 +1,50 @@
+//
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Helper function for measuring stack consumption of signal handlers.
+
+#ifndef ABSL_DEBUGGING_INTERNAL_STACK_CONSUMPTION_H_
+#define ABSL_DEBUGGING_INTERNAL_STACK_CONSUMPTION_H_
+
+#include "absl/base/config.h"
+
+// The code in this module is not portable.
+// Use this feature test macro to detect its availability.
+#ifdef ABSL_INTERNAL_HAVE_DEBUGGING_STACK_CONSUMPTION
+#error ABSL_INTERNAL_HAVE_DEBUGGING_STACK_CONSUMPTION cannot be set directly
+#elif !defined(__APPLE__) && !defined(_WIN32) && \
+ (defined(__i386__) || defined(__x86_64__) || defined(__ppc__) || \
+ defined(__aarch64__))
+#define ABSL_INTERNAL_HAVE_DEBUGGING_STACK_CONSUMPTION 1
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace debugging_internal {
+
+// Returns the stack consumption in bytes for the code exercised by
+// signal_handler. To measure stack consumption, signal_handler is registered
+// as a signal handler, so the code that it exercises must be async-signal
+// safe. The argument of signal_handler is an implementation detail of signal
+// handlers and should ignored by the code for signal_handler. Use global
+// variables to pass information between your test code and signal_handler.
+int GetSignalHandlerStackConsumption(void (*signal_handler)(int));
+
+} // namespace debugging_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_INTERNAL_HAVE_DEBUGGING_STACK_CONSUMPTION
+
+#endif // ABSL_DEBUGGING_INTERNAL_STACK_CONSUMPTION_H_
diff --git a/third_party/abseil/src/absl/debugging/internal/stack_consumption_test.cc b/third_party/abseil/src/absl/debugging/internal/stack_consumption_test.cc
new file mode 100644
index 0000000..80445bf
--- /dev/null
+++ b/third_party/abseil/src/absl/debugging/internal/stack_consumption_test.cc
@@ -0,0 +1,50 @@
+//
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/debugging/internal/stack_consumption.h"
+
+#ifdef ABSL_INTERNAL_HAVE_DEBUGGING_STACK_CONSUMPTION
+
+#include <string.h>
+
+#include "gtest/gtest.h"
+#include "absl/base/internal/raw_logging.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace debugging_internal {
+namespace {
+
+static void SimpleSignalHandler(int signo) {
+ char buf[100];
+ memset(buf, 'a', sizeof(buf));
+
+ // Never true, but prevents compiler from optimizing buf out.
+ if (signo == 0) {
+ ABSL_RAW_LOG(INFO, "%p", static_cast<void*>(buf));
+ }
+}
+
+TEST(SignalHandlerStackConsumptionTest, MeasuresStackConsumption) {
+ // Our handler should consume reasonable number of bytes.
+ EXPECT_GE(GetSignalHandlerStackConsumption(SimpleSignalHandler), 100);
+}
+
+} // namespace
+} // namespace debugging_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_INTERNAL_HAVE_DEBUGGING_STACK_CONSUMPTION
diff --git a/third_party/abseil/src/absl/debugging/internal/stacktrace_aarch64-inl.inc b/third_party/abseil/src/absl/debugging/internal/stacktrace_aarch64-inl.inc
new file mode 100644
index 0000000..f4859d7
--- /dev/null
+++ b/third_party/abseil/src/absl/debugging/internal/stacktrace_aarch64-inl.inc
@@ -0,0 +1,199 @@
+#ifndef ABSL_DEBUGGING_INTERNAL_STACKTRACE_AARCH64_INL_H_
+#define ABSL_DEBUGGING_INTERNAL_STACKTRACE_AARCH64_INL_H_
+
+// Generate stack tracer for aarch64
+
+#if defined(__linux__)
+#include <sys/mman.h>
+#include <ucontext.h>
+#include <unistd.h>
+#endif
+
+#include <atomic>
+#include <cassert>
+#include <cstdint>
+#include <iostream>
+
+#include "absl/base/attributes.h"
+#include "absl/debugging/internal/address_is_readable.h"
+#include "absl/debugging/internal/vdso_support.h" // a no-op on non-elf or non-glibc systems
+#include "absl/debugging/stacktrace.h"
+
+static const uintptr_t kUnknownFrameSize = 0;
+
+#if defined(__linux__)
+// Returns the address of the VDSO __kernel_rt_sigreturn function, if present.
+static const unsigned char* GetKernelRtSigreturnAddress() {
+ constexpr uintptr_t kImpossibleAddress = 1;
+ ABSL_CONST_INIT static std::atomic<uintptr_t> memoized{kImpossibleAddress};
+ uintptr_t address = memoized.load(std::memory_order_relaxed);
+ if (address != kImpossibleAddress) {
+ return reinterpret_cast<const unsigned char*>(address);
+ }
+
+ address = reinterpret_cast<uintptr_t>(nullptr);
+
+#ifdef ABSL_HAVE_VDSO_SUPPORT
+ absl::debugging_internal::VDSOSupport vdso;
+ if (vdso.IsPresent()) {
+ absl::debugging_internal::VDSOSupport::SymbolInfo symbol_info;
+ auto lookup = [&](int type) {
+ return vdso.LookupSymbol("__kernel_rt_sigreturn", "LINUX_2.6.39", type,
+ &symbol_info);
+ };
+ if ((!lookup(STT_FUNC) && !lookup(STT_NOTYPE)) ||
+ symbol_info.address == nullptr) {
+ // Unexpected: VDSO is present, yet the expected symbol is missing
+ // or null.
+ assert(false && "VDSO is present, but doesn't have expected symbol");
+ } else {
+ if (reinterpret_cast<uintptr_t>(symbol_info.address) !=
+ kImpossibleAddress) {
+ address = reinterpret_cast<uintptr_t>(symbol_info.address);
+ } else {
+ assert(false && "VDSO returned invalid address");
+ }
+ }
+ }
+#endif
+
+ memoized.store(address, std::memory_order_relaxed);
+ return reinterpret_cast<const unsigned char*>(address);
+}
+#endif // __linux__
+
+// Compute the size of a stack frame in [low..high). We assume that
+// low < high. Return size of kUnknownFrameSize.
+template<typename T>
+static inline uintptr_t ComputeStackFrameSize(const T* low,
+ const T* high) {
+ const char* low_char_ptr = reinterpret_cast<const char *>(low);
+ const char* high_char_ptr = reinterpret_cast<const char *>(high);
+ return low < high ? high_char_ptr - low_char_ptr : kUnknownFrameSize;
+}
+
+// Given a pointer to a stack frame, locate and return the calling
+// stackframe, or return null if no stackframe can be found. Perform sanity
+// checks (the strictness of which is controlled by the boolean parameter
+// "STRICT_UNWINDING") to reduce the chance that a bad pointer is returned.
+template<bool STRICT_UNWINDING, bool WITH_CONTEXT>
+ABSL_ATTRIBUTE_NO_SANITIZE_ADDRESS // May read random elements from stack.
+ABSL_ATTRIBUTE_NO_SANITIZE_MEMORY // May read random elements from stack.
+static void **NextStackFrame(void **old_frame_pointer, const void *uc) {
+ void **new_frame_pointer = reinterpret_cast<void**>(*old_frame_pointer);
+ bool check_frame_size = true;
+
+#if defined(__linux__)
+ if (WITH_CONTEXT && uc != nullptr) {
+ // Check to see if next frame's return address is __kernel_rt_sigreturn.
+ if (old_frame_pointer[1] == GetKernelRtSigreturnAddress()) {
+ const ucontext_t *ucv = static_cast<const ucontext_t *>(uc);
+ // old_frame_pointer[0] is not suitable for unwinding, look at
+ // ucontext to discover frame pointer before signal.
+ void **const pre_signal_frame_pointer =
+ reinterpret_cast<void **>(ucv->uc_mcontext.regs[29]);
+
+ // Check that alleged frame pointer is actually readable. This is to
+ // prevent "double fault" in case we hit the first fault due to e.g.
+ // stack corruption.
+ if (!absl::debugging_internal::AddressIsReadable(
+ pre_signal_frame_pointer))
+ return nullptr;
+
+ // Alleged frame pointer is readable, use it for further unwinding.
+ new_frame_pointer = pre_signal_frame_pointer;
+
+ // Skip frame size check if we return from a signal. We may be using a
+ // an alternate stack for signals.
+ check_frame_size = false;
+ }
+ }
+#endif
+
+ // aarch64 ABI requires stack pointer to be 16-byte-aligned.
+ if ((reinterpret_cast<uintptr_t>(new_frame_pointer) & 15) != 0)
+ return nullptr;
+
+ // Check frame size. In strict mode, we assume frames to be under
+ // 100,000 bytes. In non-strict mode, we relax the limit to 1MB.
+ if (check_frame_size) {
+ const uintptr_t max_size = STRICT_UNWINDING ? 100000 : 1000000;
+ const uintptr_t frame_size =
+ ComputeStackFrameSize(old_frame_pointer, new_frame_pointer);
+ if (frame_size == kUnknownFrameSize || frame_size > max_size)
+ return nullptr;
+ }
+
+ return new_frame_pointer;
+}
+
+template <bool IS_STACK_FRAMES, bool IS_WITH_CONTEXT>
+ABSL_ATTRIBUTE_NO_SANITIZE_ADDRESS // May read random elements from stack.
+ABSL_ATTRIBUTE_NO_SANITIZE_MEMORY // May read random elements from stack.
+static int UnwindImpl(void** result, int* sizes, int max_depth, int skip_count,
+ const void *ucp, int *min_dropped_frames) {
+#ifdef __GNUC__
+ void **frame_pointer = reinterpret_cast<void**>(__builtin_frame_address(0));
+#else
+# error reading stack point not yet supported on this platform.
+#endif
+
+ skip_count++; // Skip the frame for this function.
+ int n = 0;
+
+ // The frame pointer points to low address of a frame. The first 64-bit
+ // word of a frame points to the next frame up the call chain, which normally
+ // is just after the high address of the current frame. The second word of
+ // a frame contains return adress of to the caller. To find a pc value
+ // associated with the current frame, we need to go down a level in the call
+ // chain. So we remember return the address of the last frame seen. This
+ // does not work for the first stack frame, which belongs to UnwindImp() but
+ // we skip the frame for UnwindImp() anyway.
+ void* prev_return_address = nullptr;
+
+ while (frame_pointer && n < max_depth) {
+ // The absl::GetStackFrames routine is called when we are in some
+ // informational context (the failure signal handler for example).
+ // Use the non-strict unwinding rules to produce a stack trace
+ // that is as complete as possible (even if it contains a few bogus
+ // entries in some rare cases).
+ void **next_frame_pointer =
+ NextStackFrame<!IS_STACK_FRAMES, IS_WITH_CONTEXT>(frame_pointer, ucp);
+
+ if (skip_count > 0) {
+ skip_count--;
+ } else {
+ result[n] = prev_return_address;
+ if (IS_STACK_FRAMES) {
+ sizes[n] = ComputeStackFrameSize(frame_pointer, next_frame_pointer);
+ }
+ n++;
+ }
+ prev_return_address = frame_pointer[1];
+ frame_pointer = next_frame_pointer;
+ }
+ if (min_dropped_frames != nullptr) {
+ // Implementation detail: we clamp the max of frames we are willing to
+ // count, so as not to spend too much time in the loop below.
+ const int kMaxUnwind = 200;
+ int j = 0;
+ for (; frame_pointer != nullptr && j < kMaxUnwind; j++) {
+ frame_pointer =
+ NextStackFrame<!IS_STACK_FRAMES, IS_WITH_CONTEXT>(frame_pointer, ucp);
+ }
+ *min_dropped_frames = j;
+ }
+ return n;
+}
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace debugging_internal {
+bool StackTraceWorksForTest() {
+ return true;
+}
+} // namespace debugging_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_DEBUGGING_INTERNAL_STACKTRACE_AARCH64_INL_H_
diff --git a/third_party/abseil/src/absl/debugging/internal/stacktrace_arm-inl.inc b/third_party/abseil/src/absl/debugging/internal/stacktrace_arm-inl.inc
new file mode 100644
index 0000000..2a1bf2e
--- /dev/null
+++ b/third_party/abseil/src/absl/debugging/internal/stacktrace_arm-inl.inc
@@ -0,0 +1,134 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// This is inspired by Craig Silverstein's PowerPC stacktrace code.
+
+#ifndef ABSL_DEBUGGING_INTERNAL_STACKTRACE_ARM_INL_H_
+#define ABSL_DEBUGGING_INTERNAL_STACKTRACE_ARM_INL_H_
+
+#include <cstdint>
+
+#include "absl/debugging/stacktrace.h"
+
+// WARNING:
+// This only works if all your code is in either ARM or THUMB mode. With
+// interworking, the frame pointer of the caller can either be in r11 (ARM
+// mode) or r7 (THUMB mode). A callee only saves the frame pointer of its
+// mode in a fixed location on its stack frame. If the caller is a different
+// mode, there is no easy way to find the frame pointer. It can either be
+// still in the designated register or saved on stack along with other callee
+// saved registers.
+
+// Given a pointer to a stack frame, locate and return the calling
+// stackframe, or return nullptr if no stackframe can be found. Perform sanity
+// checks (the strictness of which is controlled by the boolean parameter
+// "STRICT_UNWINDING") to reduce the chance that a bad pointer is returned.
+template<bool STRICT_UNWINDING>
+static void **NextStackFrame(void **old_sp) {
+ void **new_sp = (void**) old_sp[-1];
+
+ // Check that the transition from frame pointer old_sp to frame
+ // pointer new_sp isn't clearly bogus
+ if (STRICT_UNWINDING) {
+ // With the stack growing downwards, older stack frame must be
+ // at a greater address that the current one.
+ if (new_sp <= old_sp) return nullptr;
+ // Assume stack frames larger than 100,000 bytes are bogus.
+ if ((uintptr_t)new_sp - (uintptr_t)old_sp > 100000) return nullptr;
+ } else {
+ // In the non-strict mode, allow discontiguous stack frames.
+ // (alternate-signal-stacks for example).
+ if (new_sp == old_sp) return nullptr;
+ // And allow frames upto about 1MB.
+ if ((new_sp > old_sp)
+ && ((uintptr_t)new_sp - (uintptr_t)old_sp > 1000000)) return nullptr;
+ }
+ if ((uintptr_t)new_sp & (sizeof(void *) - 1)) return nullptr;
+ return new_sp;
+}
+
+// This ensures that absl::GetStackTrace sets up the Link Register properly.
+#ifdef __GNUC__
+void StacktraceArmDummyFunction() __attribute__((noinline));
+void StacktraceArmDummyFunction() { __asm__ volatile(""); }
+#else
+# error StacktraceArmDummyFunction() needs to be ported to this platform.
+#endif
+
+template <bool IS_STACK_FRAMES, bool IS_WITH_CONTEXT>
+static int UnwindImpl(void** result, int* sizes, int max_depth, int skip_count,
+ const void * /* ucp */, int *min_dropped_frames) {
+#ifdef __GNUC__
+ void **sp = reinterpret_cast<void**>(__builtin_frame_address(0));
+#else
+# error reading stack point not yet supported on this platform.
+#endif
+
+ // On ARM, the return address is stored in the link register (r14).
+ // This is not saved on the stack frame of a leaf function. To
+ // simplify code that reads return addresses, we call a dummy
+ // function so that the return address of this function is also
+ // stored in the stack frame. This works at least for gcc.
+ StacktraceArmDummyFunction();
+
+ int n = 0;
+ while (sp && n < max_depth) {
+ // The absl::GetStackFrames routine is called when we are in some
+ // informational context (the failure signal handler for example).
+ // Use the non-strict unwinding rules to produce a stack trace
+ // that is as complete as possible (even if it contains a few bogus
+ // entries in some rare cases).
+ void **next_sp = NextStackFrame<!IS_STACK_FRAMES>(sp);
+
+ if (skip_count > 0) {
+ skip_count--;
+ } else {
+ result[n] = *sp;
+
+ if (IS_STACK_FRAMES) {
+ if (next_sp > sp) {
+ sizes[n] = (uintptr_t)next_sp - (uintptr_t)sp;
+ } else {
+ // A frame-size of 0 is used to indicate unknown frame size.
+ sizes[n] = 0;
+ }
+ }
+ n++;
+ }
+ sp = next_sp;
+ }
+ if (min_dropped_frames != nullptr) {
+ // Implementation detail: we clamp the max of frames we are willing to
+ // count, so as not to spend too much time in the loop below.
+ const int kMaxUnwind = 200;
+ int j = 0;
+ for (; sp != nullptr && j < kMaxUnwind; j++) {
+ sp = NextStackFrame<!IS_STACK_FRAMES>(sp);
+ }
+ *min_dropped_frames = j;
+ }
+ return n;
+}
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace debugging_internal {
+bool StackTraceWorksForTest() {
+ return false;
+}
+} // namespace debugging_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_DEBUGGING_INTERNAL_STACKTRACE_ARM_INL_H_
diff --git a/third_party/abseil/src/absl/debugging/internal/stacktrace_config.h b/third_party/abseil/src/absl/debugging/internal/stacktrace_config.h
new file mode 100644
index 0000000..90af852
--- /dev/null
+++ b/third_party/abseil/src/absl/debugging/internal/stacktrace_config.h
@@ -0,0 +1,89 @@
+/*
+ * Copyright 2017 The Abseil Authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+
+ * Defines ABSL_STACKTRACE_INL_HEADER to the *-inl.h containing
+ * actual unwinder implementation.
+ * This header is "private" to stacktrace.cc.
+ * DO NOT include it into any other files.
+*/
+#ifndef ABSL_DEBUGGING_INTERNAL_STACKTRACE_CONFIG_H_
+#define ABSL_DEBUGGING_INTERNAL_STACKTRACE_CONFIG_H_
+
+#if defined(ABSL_STACKTRACE_INL_HEADER)
+#error ABSL_STACKTRACE_INL_HEADER cannot be directly set
+
+#elif defined(_WIN32)
+#define ABSL_STACKTRACE_INL_HEADER \
+ "absl/debugging/internal/stacktrace_win32-inl.inc"
+
+#elif defined(__APPLE__)
+// Thread local support required for UnwindImpl.
+// Notes:
+// * Xcode's clang did not support `thread_local` until version 8, and
+// even then not for all iOS < 9.0.
+// * Xcode 9.3 started disallowing `thread_local` for 32-bit iOS simulator
+// targeting iOS 9.x.
+// * Xcode 10 moves the deployment target check for iOS < 9.0 to link time
+// making __has_feature unreliable there.
+//
+// Otherwise, `__has_feature` is only supported by Clang so it has be inside
+// `defined(__APPLE__)` check.
+#if __has_feature(cxx_thread_local) && \
+ !(TARGET_OS_IPHONE && __IPHONE_OS_VERSION_MIN_REQUIRED < __IPHONE_9_0)
+#define ABSL_STACKTRACE_INL_HEADER \
+ "absl/debugging/internal/stacktrace_generic-inl.inc"
+#endif
+
+#elif defined(__linux__) && !defined(__ANDROID__)
+
+#if defined(NO_FRAME_POINTER) && \
+ (defined(__i386__) || defined(__x86_64__) || defined(__aarch64__))
+// Note: The libunwind-based implementation is not available to open-source
+// users.
+#define ABSL_STACKTRACE_INL_HEADER \
+ "absl/debugging/internal/stacktrace_libunwind-inl.inc"
+#define STACKTRACE_USES_LIBUNWIND 1
+#elif defined(NO_FRAME_POINTER) && defined(__has_include)
+#if __has_include(<execinfo.h>)
+// Note: When using glibc this may require -funwind-tables to function properly.
+#define ABSL_STACKTRACE_INL_HEADER \
+ "absl/debugging/internal/stacktrace_generic-inl.inc"
+#endif
+#elif defined(__i386__) || defined(__x86_64__)
+#define ABSL_STACKTRACE_INL_HEADER \
+ "absl/debugging/internal/stacktrace_x86-inl.inc"
+#elif defined(__ppc__) || defined(__PPC__)
+#define ABSL_STACKTRACE_INL_HEADER \
+ "absl/debugging/internal/stacktrace_powerpc-inl.inc"
+#elif defined(__aarch64__)
+#define ABSL_STACKTRACE_INL_HEADER \
+ "absl/debugging/internal/stacktrace_aarch64-inl.inc"
+#elif defined(__has_include)
+#if __has_include(<execinfo.h>)
+// Note: When using glibc this may require -funwind-tables to function properly.
+#define ABSL_STACKTRACE_INL_HEADER \
+ "absl/debugging/internal/stacktrace_generic-inl.inc"
+#endif
+#endif
+
+#endif
+
+// Fallback to the empty implementation.
+#if !defined(ABSL_STACKTRACE_INL_HEADER)
+#define ABSL_STACKTRACE_INL_HEADER \
+ "absl/debugging/internal/stacktrace_unimplemented-inl.inc"
+#endif
+
+#endif // ABSL_DEBUGGING_INTERNAL_STACKTRACE_CONFIG_H_
diff --git a/third_party/abseil/src/absl/debugging/internal/stacktrace_generic-inl.inc b/third_party/abseil/src/absl/debugging/internal/stacktrace_generic-inl.inc
new file mode 100644
index 0000000..b2792a1
--- /dev/null
+++ b/third_party/abseil/src/absl/debugging/internal/stacktrace_generic-inl.inc
@@ -0,0 +1,108 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// Portable implementation - just use glibc
+//
+// Note: The glibc implementation may cause a call to malloc.
+// This can cause a deadlock in HeapProfiler.
+
+#ifndef ABSL_DEBUGGING_INTERNAL_STACKTRACE_GENERIC_INL_H_
+#define ABSL_DEBUGGING_INTERNAL_STACKTRACE_GENERIC_INL_H_
+
+#include <execinfo.h>
+#include <atomic>
+#include <cstring>
+
+#include "absl/debugging/stacktrace.h"
+#include "absl/base/attributes.h"
+
+// Sometimes, we can try to get a stack trace from within a stack
+// trace, because we don't block signals inside this code (which would be too
+// expensive: the two extra system calls per stack trace do matter here).
+// That can cause a self-deadlock.
+// Protect against such reentrant call by failing to get a stack trace.
+//
+// We use __thread here because the code here is extremely low level -- it is
+// called while collecting stack traces from within malloc and mmap, and thus
+// can not call anything which might call malloc or mmap itself.
+static __thread int recursive = 0;
+
+// The stack trace function might be invoked very early in the program's
+// execution (e.g. from the very first malloc if using tcmalloc). Also, the
+// glibc implementation itself will trigger malloc the first time it is called.
+// As such, we suppress usage of backtrace during this early stage of execution.
+static std::atomic<bool> disable_stacktraces(true); // Disabled until healthy.
+// Waiting until static initializers run seems to be late enough.
+// This file is included into stacktrace.cc so this will only run once.
+ABSL_ATTRIBUTE_UNUSED static int stacktraces_enabler = []() {
+ void* unused_stack[1];
+ // Force the first backtrace to happen early to get the one-time shared lib
+ // loading (allocation) out of the way. After the first call it is much safer
+ // to use backtrace from a signal handler if we crash somewhere later.
+ backtrace(unused_stack, 1);
+ disable_stacktraces.store(false, std::memory_order_relaxed);
+ return 0;
+}();
+
+template <bool IS_STACK_FRAMES, bool IS_WITH_CONTEXT>
+static int UnwindImpl(void** result, int* sizes, int max_depth, int skip_count,
+ const void *ucp, int *min_dropped_frames) {
+ if (recursive || disable_stacktraces.load(std::memory_order_relaxed)) {
+ return 0;
+ }
+ ++recursive;
+
+ static_cast<void>(ucp); // Unused.
+ static const int kStackLength = 64;
+ void * stack[kStackLength];
+ int size;
+
+ size = backtrace(stack, kStackLength);
+ skip_count++; // we want to skip the current frame as well
+ int result_count = size - skip_count;
+ if (result_count < 0)
+ result_count = 0;
+ if (result_count > max_depth)
+ result_count = max_depth;
+ for (int i = 0; i < result_count; i++)
+ result[i] = stack[i + skip_count];
+
+ if (IS_STACK_FRAMES) {
+ // No implementation for finding out the stack frame sizes yet.
+ memset(sizes, 0, sizeof(*sizes) * result_count);
+ }
+ if (min_dropped_frames != nullptr) {
+ if (size - skip_count - max_depth > 0) {
+ *min_dropped_frames = size - skip_count - max_depth;
+ } else {
+ *min_dropped_frames = 0;
+ }
+ }
+
+ --recursive;
+
+ return result_count;
+}
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace debugging_internal {
+bool StackTraceWorksForTest() {
+ return true;
+}
+} // namespace debugging_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_DEBUGGING_INTERNAL_STACKTRACE_GENERIC_INL_H_
diff --git a/third_party/abseil/src/absl/debugging/internal/stacktrace_powerpc-inl.inc b/third_party/abseil/src/absl/debugging/internal/stacktrace_powerpc-inl.inc
new file mode 100644
index 0000000..2e7c2f4
--- /dev/null
+++ b/third_party/abseil/src/absl/debugging/internal/stacktrace_powerpc-inl.inc
@@ -0,0 +1,248 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// Produce stack trace. I'm guessing (hoping!) the code is much like
+// for x86. For apple machines, at least, it seems to be; see
+// https://developer.apple.com/documentation/mac/runtimehtml/RTArch-59.html
+// https://www.linux-foundation.org/spec/ELF/ppc64/PPC-elf64abi-1.9.html#STACK
+// Linux has similar code: http://patchwork.ozlabs.org/linuxppc/patch?id=8882
+
+#ifndef ABSL_DEBUGGING_INTERNAL_STACKTRACE_POWERPC_INL_H_
+#define ABSL_DEBUGGING_INTERNAL_STACKTRACE_POWERPC_INL_H_
+
+#if defined(__linux__)
+#include <asm/ptrace.h> // for PT_NIP.
+#include <ucontext.h> // for ucontext_t
+#endif
+
+#include <unistd.h>
+#include <cassert>
+#include <cstdint>
+#include <cstdio>
+
+#include "absl/base/attributes.h"
+#include "absl/base/optimization.h"
+#include "absl/base/port.h"
+#include "absl/debugging/stacktrace.h"
+#include "absl/debugging/internal/address_is_readable.h"
+#include "absl/debugging/internal/vdso_support.h" // a no-op on non-elf or non-glibc systems
+
+// Given a stack pointer, return the saved link register value.
+// Note that this is the link register for a callee.
+static inline void *StacktracePowerPCGetLR(void **sp) {
+ // PowerPC has 3 main ABIs, which say where in the stack the
+ // Link Register is. For DARWIN and AIX (used by apple and
+ // linux ppc64), it's in sp[2]. For SYSV (used by linux ppc),
+ // it's in sp[1].
+#if defined(_CALL_AIX) || defined(_CALL_DARWIN)
+ return *(sp+2);
+#elif defined(_CALL_SYSV)
+ return *(sp+1);
+#elif defined(__APPLE__) || defined(__FreeBSD__) || \
+ (defined(__linux__) && defined(__PPC64__))
+ // This check is in case the compiler doesn't define _CALL_AIX/etc.
+ return *(sp+2);
+#elif defined(__linux)
+ // This check is in case the compiler doesn't define _CALL_SYSV.
+ return *(sp+1);
+#else
+#error Need to specify the PPC ABI for your archiecture.
+#endif
+}
+
+// Given a pointer to a stack frame, locate and return the calling
+// stackframe, or return null if no stackframe can be found. Perform sanity
+// checks (the strictness of which is controlled by the boolean parameter
+// "STRICT_UNWINDING") to reduce the chance that a bad pointer is returned.
+template<bool STRICT_UNWINDING, bool IS_WITH_CONTEXT>
+ABSL_ATTRIBUTE_NO_SANITIZE_ADDRESS // May read random elements from stack.
+ABSL_ATTRIBUTE_NO_SANITIZE_MEMORY // May read random elements from stack.
+static void **NextStackFrame(void **old_sp, const void *uc) {
+ void **new_sp = (void **) *old_sp;
+ enum { kStackAlignment = 16 };
+
+ // Check that the transition from frame pointer old_sp to frame
+ // pointer new_sp isn't clearly bogus
+ if (STRICT_UNWINDING) {
+ // With the stack growing downwards, older stack frame must be
+ // at a greater address that the current one.
+ if (new_sp <= old_sp) return nullptr;
+ // Assume stack frames larger than 100,000 bytes are bogus.
+ if ((uintptr_t)new_sp - (uintptr_t)old_sp > 100000) return nullptr;
+ } else {
+ // In the non-strict mode, allow discontiguous stack frames.
+ // (alternate-signal-stacks for example).
+ if (new_sp == old_sp) return nullptr;
+ // And allow frames upto about 1MB.
+ if ((new_sp > old_sp)
+ && ((uintptr_t)new_sp - (uintptr_t)old_sp > 1000000)) return nullptr;
+ }
+ if ((uintptr_t)new_sp % kStackAlignment != 0) return nullptr;
+
+#if defined(__linux__)
+ enum StackTraceKernelSymbolStatus {
+ kNotInitialized = 0, kAddressValid, kAddressInvalid };
+
+ if (IS_WITH_CONTEXT && uc != nullptr) {
+ static StackTraceKernelSymbolStatus kernel_symbol_status =
+ kNotInitialized; // Sentinel: not computed yet.
+ // Initialize with sentinel value: __kernel_rt_sigtramp_rt64 can not
+ // possibly be there.
+ static const unsigned char *kernel_sigtramp_rt64_address = nullptr;
+ if (kernel_symbol_status == kNotInitialized) {
+ absl::debugging_internal::VDSOSupport vdso;
+ if (vdso.IsPresent()) {
+ absl::debugging_internal::VDSOSupport::SymbolInfo
+ sigtramp_rt64_symbol_info;
+ if (!vdso.LookupSymbol(
+ "__kernel_sigtramp_rt64", "LINUX_2.6.15",
+ absl::debugging_internal::VDSOSupport::kVDSOSymbolType,
+ &sigtramp_rt64_symbol_info) ||
+ sigtramp_rt64_symbol_info.address == nullptr) {
+ // Unexpected: VDSO is present, yet the expected symbol is missing
+ // or null.
+ assert(false && "VDSO is present, but doesn't have expected symbol");
+ kernel_symbol_status = kAddressInvalid;
+ } else {
+ kernel_sigtramp_rt64_address =
+ reinterpret_cast<const unsigned char *>(
+ sigtramp_rt64_symbol_info.address);
+ kernel_symbol_status = kAddressValid;
+ }
+ } else {
+ kernel_symbol_status = kAddressInvalid;
+ }
+ }
+
+ if (new_sp != nullptr &&
+ kernel_symbol_status == kAddressValid &&
+ StacktracePowerPCGetLR(new_sp) == kernel_sigtramp_rt64_address) {
+ const ucontext_t* signal_context =
+ reinterpret_cast<const ucontext_t*>(uc);
+ void **const sp_before_signal =
+ reinterpret_cast<void**>(signal_context->uc_mcontext.gp_regs[PT_R1]);
+ // Check that alleged sp before signal is nonnull and is reasonably
+ // aligned.
+ if (sp_before_signal != nullptr &&
+ ((uintptr_t)sp_before_signal % kStackAlignment) == 0) {
+ // Check that alleged stack pointer is actually readable. This is to
+ // prevent a "double fault" in case we hit the first fault due to e.g.
+ // a stack corruption.
+ if (absl::debugging_internal::AddressIsReadable(sp_before_signal)) {
+ // Alleged stack pointer is readable, use it for further unwinding.
+ new_sp = sp_before_signal;
+ }
+ }
+ }
+ }
+#endif
+
+ return new_sp;
+}
+
+// This ensures that absl::GetStackTrace sets up the Link Register properly.
+ABSL_ATTRIBUTE_NOINLINE static void AbslStacktracePowerPCDummyFunction() {
+ ABSL_BLOCK_TAIL_CALL_OPTIMIZATION();
+}
+
+template <bool IS_STACK_FRAMES, bool IS_WITH_CONTEXT>
+ABSL_ATTRIBUTE_NO_SANITIZE_ADDRESS // May read random elements from stack.
+ABSL_ATTRIBUTE_NO_SANITIZE_MEMORY // May read random elements from stack.
+static int UnwindImpl(void** result, int* sizes, int max_depth, int skip_count,
+ const void *ucp, int *min_dropped_frames) {
+ void **sp;
+ // Apple macOS uses an old version of gnu as -- both Darwin 7.9.0 (Panther)
+ // and Darwin 8.8.1 (Tiger) use as 1.38. This means we have to use a
+ // different asm syntax. I don't know quite the best way to discriminate
+ // systems using the old as from the new one; I've gone with __APPLE__.
+#ifdef __APPLE__
+ __asm__ volatile ("mr %0,r1" : "=r" (sp));
+#else
+ __asm__ volatile ("mr %0,1" : "=r" (sp));
+#endif
+
+ // On PowerPC, the "Link Register" or "Link Record" (LR), is a stack
+ // entry that holds the return address of the subroutine call (what
+ // instruction we run after our function finishes). This is the
+ // same as the stack-pointer of our parent routine, which is what we
+ // want here. While the compiler will always(?) set up LR for
+ // subroutine calls, it may not for leaf functions (such as this one).
+ // This routine forces the compiler (at least gcc) to push it anyway.
+ AbslStacktracePowerPCDummyFunction();
+
+ // The LR save area is used by the callee, so the top entry is bogus.
+ skip_count++;
+
+ int n = 0;
+
+ // Unlike ABIs of X86 and ARM, PowerPC ABIs say that return address (in
+ // the link register) of a function call is stored in the caller's stack
+ // frame instead of the callee's. When we look for the return address
+ // associated with a stack frame, we need to make sure that there is a
+ // caller frame before it. So we call NextStackFrame before entering the
+ // loop below and check next_sp instead of sp for loop termination.
+ // The outermost frame is set up by runtimes and it does not have a
+ // caller frame, so it is skipped.
+
+ // The absl::GetStackFrames routine is called when we are in some
+ // informational context (the failure signal handler for example).
+ // Use the non-strict unwinding rules to produce a stack trace
+ // that is as complete as possible (even if it contains a few
+ // bogus entries in some rare cases).
+ void **next_sp = NextStackFrame<!IS_STACK_FRAMES, IS_WITH_CONTEXT>(sp, ucp);
+
+ while (next_sp && n < max_depth) {
+ if (skip_count > 0) {
+ skip_count--;
+ } else {
+ result[n] = StacktracePowerPCGetLR(sp);
+ if (IS_STACK_FRAMES) {
+ if (next_sp > sp) {
+ sizes[n] = (uintptr_t)next_sp - (uintptr_t)sp;
+ } else {
+ // A frame-size of 0 is used to indicate unknown frame size.
+ sizes[n] = 0;
+ }
+ }
+ n++;
+ }
+
+ sp = next_sp;
+ next_sp = NextStackFrame<!IS_STACK_FRAMES, IS_WITH_CONTEXT>(sp, ucp);
+ }
+
+ if (min_dropped_frames != nullptr) {
+ // Implementation detail: we clamp the max of frames we are willing to
+ // count, so as not to spend too much time in the loop below.
+ const int kMaxUnwind = 1000;
+ int j = 0;
+ for (; next_sp != nullptr && j < kMaxUnwind; j++) {
+ next_sp = NextStackFrame<!IS_STACK_FRAMES, IS_WITH_CONTEXT>(next_sp, ucp);
+ }
+ *min_dropped_frames = j;
+ }
+ return n;
+}
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace debugging_internal {
+bool StackTraceWorksForTest() {
+ return true;
+}
+} // namespace debugging_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_DEBUGGING_INTERNAL_STACKTRACE_POWERPC_INL_H_
diff --git a/third_party/abseil/src/absl/debugging/internal/stacktrace_unimplemented-inl.inc b/third_party/abseil/src/absl/debugging/internal/stacktrace_unimplemented-inl.inc
new file mode 100644
index 0000000..5b8fb19
--- /dev/null
+++ b/third_party/abseil/src/absl/debugging/internal/stacktrace_unimplemented-inl.inc
@@ -0,0 +1,24 @@
+#ifndef ABSL_DEBUGGING_INTERNAL_STACKTRACE_UNIMPLEMENTED_INL_H_
+#define ABSL_DEBUGGING_INTERNAL_STACKTRACE_UNIMPLEMENTED_INL_H_
+
+template <bool IS_STACK_FRAMES, bool IS_WITH_CONTEXT>
+static int UnwindImpl(void** /* result */, int* /* sizes */,
+ int /* max_depth */, int /* skip_count */,
+ const void* /* ucp */, int *min_dropped_frames) {
+ if (min_dropped_frames != nullptr) {
+ *min_dropped_frames = 0;
+ }
+ return 0;
+}
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace debugging_internal {
+bool StackTraceWorksForTest() {
+ return false;
+}
+} // namespace debugging_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_DEBUGGING_INTERNAL_STACKTRACE_UNIMPLEMENTED_INL_H_
diff --git a/third_party/abseil/src/absl/debugging/internal/stacktrace_win32-inl.inc b/third_party/abseil/src/absl/debugging/internal/stacktrace_win32-inl.inc
new file mode 100644
index 0000000..1c666c8
--- /dev/null
+++ b/third_party/abseil/src/absl/debugging/internal/stacktrace_win32-inl.inc
@@ -0,0 +1,93 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// Produces a stack trace for Windows. Normally, one could use
+// stacktrace_x86-inl.h or stacktrace_x86_64-inl.h -- and indeed, that
+// should work for binaries compiled using MSVC in "debug" mode.
+// However, in "release" mode, Windows uses frame-pointer
+// optimization, which makes getting a stack trace very difficult.
+//
+// There are several approaches one can take. One is to use Windows
+// intrinsics like StackWalk64. These can work, but have restrictions
+// on how successful they can be. Another attempt is to write a
+// version of stacktrace_x86-inl.h that has heuristic support for
+// dealing with FPO, similar to what WinDbg does (see
+// http://www.nynaeve.net/?p=97). There are (non-working) examples of
+// these approaches, complete with TODOs, in stacktrace_win32-inl.h#1
+//
+// The solution we've ended up doing is to call the undocumented
+// windows function RtlCaptureStackBackTrace, which probably doesn't
+// work with FPO but at least is fast, and doesn't require a symbol
+// server.
+//
+// This code is inspired by a patch from David Vitek:
+// https://code.google.com/p/google-perftools/issues/detail?id=83
+
+#ifndef ABSL_DEBUGGING_INTERNAL_STACKTRACE_WIN32_INL_H_
+#define ABSL_DEBUGGING_INTERNAL_STACKTRACE_WIN32_INL_H_
+
+#include <windows.h> // for GetProcAddress and GetModuleHandle
+#include <cassert>
+
+typedef USHORT NTAPI RtlCaptureStackBackTrace_Function(
+ IN ULONG frames_to_skip,
+ IN ULONG frames_to_capture,
+ OUT PVOID *backtrace,
+ OUT PULONG backtrace_hash);
+
+// It is not possible to load RtlCaptureStackBackTrace at static init time in
+// UWP. CaptureStackBackTrace is the public version of RtlCaptureStackBackTrace
+#if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_APP) && \
+ !WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP)
+static RtlCaptureStackBackTrace_Function* const RtlCaptureStackBackTrace_fn =
+ &::CaptureStackBackTrace;
+#else
+// Load the function we need at static init time, where we don't have
+// to worry about someone else holding the loader's lock.
+static RtlCaptureStackBackTrace_Function* const RtlCaptureStackBackTrace_fn =
+ (RtlCaptureStackBackTrace_Function*)GetProcAddress(
+ GetModuleHandleA("ntdll.dll"), "RtlCaptureStackBackTrace");
+#endif // WINAPI_PARTITION_APP && !WINAPI_PARTITION_DESKTOP
+
+template <bool IS_STACK_FRAMES, bool IS_WITH_CONTEXT>
+static int UnwindImpl(void** result, int* sizes, int max_depth, int skip_count,
+ const void*, int* min_dropped_frames) {
+ int n = 0;
+ if (!RtlCaptureStackBackTrace_fn) {
+ // can't find a stacktrace with no function to call
+ } else {
+ n = (int)RtlCaptureStackBackTrace_fn(skip_count + 2, max_depth, result, 0);
+ }
+ if (IS_STACK_FRAMES) {
+ // No implementation for finding out the stack frame sizes yet.
+ memset(sizes, 0, sizeof(*sizes) * n);
+ }
+ if (min_dropped_frames != nullptr) {
+ // Not implemented.
+ *min_dropped_frames = 0;
+ }
+ return n;
+}
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace debugging_internal {
+bool StackTraceWorksForTest() {
+ return false;
+}
+} // namespace debugging_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_DEBUGGING_INTERNAL_STACKTRACE_WIN32_INL_H_
diff --git a/third_party/abseil/src/absl/debugging/internal/stacktrace_x86-inl.inc b/third_party/abseil/src/absl/debugging/internal/stacktrace_x86-inl.inc
new file mode 100644
index 0000000..bc320ff
--- /dev/null
+++ b/third_party/abseil/src/absl/debugging/internal/stacktrace_x86-inl.inc
@@ -0,0 +1,346 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// Produce stack trace
+
+#ifndef ABSL_DEBUGGING_INTERNAL_STACKTRACE_X86_INL_INC_
+#define ABSL_DEBUGGING_INTERNAL_STACKTRACE_X86_INL_INC_
+
+#if defined(__linux__) && (defined(__i386__) || defined(__x86_64__))
+#include <ucontext.h> // for ucontext_t
+#endif
+
+#if !defined(_WIN32)
+#include <unistd.h>
+#endif
+
+#include <cassert>
+#include <cstdint>
+
+#include "absl/base/macros.h"
+#include "absl/base/port.h"
+#include "absl/debugging/internal/address_is_readable.h"
+#include "absl/debugging/internal/vdso_support.h" // a no-op on non-elf or non-glibc systems
+#include "absl/debugging/stacktrace.h"
+
+#include "absl/base/internal/raw_logging.h"
+
+using absl::debugging_internal::AddressIsReadable;
+
+#if defined(__linux__) && defined(__i386__)
+// Count "push %reg" instructions in VDSO __kernel_vsyscall(),
+// preceeding "syscall" or "sysenter".
+// If __kernel_vsyscall uses frame pointer, answer 0.
+//
+// kMaxBytes tells how many instruction bytes of __kernel_vsyscall
+// to analyze before giving up. Up to kMaxBytes+1 bytes of
+// instructions could be accessed.
+//
+// Here are known __kernel_vsyscall instruction sequences:
+//
+// SYSENTER (linux-2.6.26/arch/x86/vdso/vdso32/sysenter.S).
+// Used on Intel.
+// 0xffffe400 <__kernel_vsyscall+0>: push %ecx
+// 0xffffe401 <__kernel_vsyscall+1>: push %edx
+// 0xffffe402 <__kernel_vsyscall+2>: push %ebp
+// 0xffffe403 <__kernel_vsyscall+3>: mov %esp,%ebp
+// 0xffffe405 <__kernel_vsyscall+5>: sysenter
+//
+// SYSCALL (see linux-2.6.26/arch/x86/vdso/vdso32/syscall.S).
+// Used on AMD.
+// 0xffffe400 <__kernel_vsyscall+0>: push %ebp
+// 0xffffe401 <__kernel_vsyscall+1>: mov %ecx,%ebp
+// 0xffffe403 <__kernel_vsyscall+3>: syscall
+//
+
+// The sequence below isn't actually expected in Google fleet,
+// here only for completeness. Remove this comment from OSS release.
+
+// i386 (see linux-2.6.26/arch/x86/vdso/vdso32/int80.S)
+// 0xffffe400 <__kernel_vsyscall+0>: int $0x80
+// 0xffffe401 <__kernel_vsyscall+1>: ret
+//
+static const int kMaxBytes = 10;
+
+// We use assert()s instead of DCHECK()s -- this is too low level
+// for DCHECK().
+
+static int CountPushInstructions(const unsigned char *const addr) {
+ int result = 0;
+ for (int i = 0; i < kMaxBytes; ++i) {
+ if (addr[i] == 0x89) {
+ // "mov reg,reg"
+ if (addr[i + 1] == 0xE5) {
+ // Found "mov %esp,%ebp".
+ return 0;
+ }
+ ++i; // Skip register encoding byte.
+ } else if (addr[i] == 0x0F &&
+ (addr[i + 1] == 0x34 || addr[i + 1] == 0x05)) {
+ // Found "sysenter" or "syscall".
+ return result;
+ } else if ((addr[i] & 0xF0) == 0x50) {
+ // Found "push %reg".
+ ++result;
+ } else if (addr[i] == 0xCD && addr[i + 1] == 0x80) {
+ // Found "int $0x80"
+ assert(result == 0);
+ return 0;
+ } else {
+ // Unexpected instruction.
+ assert(false && "unexpected instruction in __kernel_vsyscall");
+ return 0;
+ }
+ }
+ // Unexpected: didn't find SYSENTER or SYSCALL in
+ // [__kernel_vsyscall, __kernel_vsyscall + kMaxBytes) interval.
+ assert(false && "did not find SYSENTER or SYSCALL in __kernel_vsyscall");
+ return 0;
+}
+#endif
+
+// Assume stack frames larger than 100,000 bytes are bogus.
+static const int kMaxFrameBytes = 100000;
+
+// Returns the stack frame pointer from signal context, 0 if unknown.
+// vuc is a ucontext_t *. We use void* to avoid the use
+// of ucontext_t on non-POSIX systems.
+static uintptr_t GetFP(const void *vuc) {
+#if !defined(__linux__)
+ static_cast<void>(vuc); // Avoid an unused argument compiler warning.
+#else
+ if (vuc != nullptr) {
+ auto *uc = reinterpret_cast<const ucontext_t *>(vuc);
+#if defined(__i386__)
+ const auto bp = uc->uc_mcontext.gregs[REG_EBP];
+ const auto sp = uc->uc_mcontext.gregs[REG_ESP];
+#elif defined(__x86_64__)
+ const auto bp = uc->uc_mcontext.gregs[REG_RBP];
+ const auto sp = uc->uc_mcontext.gregs[REG_RSP];
+#else
+ const uintptr_t bp = 0;
+ const uintptr_t sp = 0;
+#endif
+ // Sanity-check that the base pointer is valid. It should be as long as
+ // SHRINK_WRAP_FRAME_POINTER is not set, but it's possible that some code in
+ // the process is compiled with --copt=-fomit-frame-pointer or
+ // --copt=-momit-leaf-frame-pointer.
+ //
+ // TODO(bcmills): -momit-leaf-frame-pointer is currently the default
+ // behavior when building with clang. Talk to the C++ toolchain team about
+ // fixing that.
+ if (bp >= sp && bp - sp <= kMaxFrameBytes) return bp;
+
+ // If bp isn't a plausible frame pointer, return the stack pointer instead.
+ // If we're lucky, it points to the start of a stack frame; otherwise, we'll
+ // get one frame of garbage in the stack trace and fail the sanity check on
+ // the next iteration.
+ return sp;
+ }
+#endif
+ return 0;
+}
+
+// Given a pointer to a stack frame, locate and return the calling
+// stackframe, or return null if no stackframe can be found. Perform sanity
+// checks (the strictness of which is controlled by the boolean parameter
+// "STRICT_UNWINDING") to reduce the chance that a bad pointer is returned.
+template <bool STRICT_UNWINDING, bool WITH_CONTEXT>
+ABSL_ATTRIBUTE_NO_SANITIZE_ADDRESS // May read random elements from stack.
+ABSL_ATTRIBUTE_NO_SANITIZE_MEMORY // May read random elements from stack.
+static void **NextStackFrame(void **old_fp, const void *uc) {
+ void **new_fp = (void **)*old_fp;
+
+#if defined(__linux__) && defined(__i386__)
+ if (WITH_CONTEXT && uc != nullptr) {
+ // How many "push %reg" instructions are there at __kernel_vsyscall?
+ // This is constant for a given kernel and processor, so compute
+ // it only once.
+ static int num_push_instructions = -1; // Sentinel: not computed yet.
+ // Initialize with sentinel value: __kernel_rt_sigreturn can not possibly
+ // be there.
+ static const unsigned char *kernel_rt_sigreturn_address = nullptr;
+ static const unsigned char *kernel_vsyscall_address = nullptr;
+ if (num_push_instructions == -1) {
+#ifdef ABSL_HAVE_VDSO_SUPPORT
+ absl::debugging_internal::VDSOSupport vdso;
+ if (vdso.IsPresent()) {
+ absl::debugging_internal::VDSOSupport::SymbolInfo
+ rt_sigreturn_symbol_info;
+ absl::debugging_internal::VDSOSupport::SymbolInfo vsyscall_symbol_info;
+ if (!vdso.LookupSymbol("__kernel_rt_sigreturn", "LINUX_2.5", STT_FUNC,
+ &rt_sigreturn_symbol_info) ||
+ !vdso.LookupSymbol("__kernel_vsyscall", "LINUX_2.5", STT_FUNC,
+ &vsyscall_symbol_info) ||
+ rt_sigreturn_symbol_info.address == nullptr ||
+ vsyscall_symbol_info.address == nullptr) {
+ // Unexpected: 32-bit VDSO is present, yet one of the expected
+ // symbols is missing or null.
+ assert(false && "VDSO is present, but doesn't have expected symbols");
+ num_push_instructions = 0;
+ } else {
+ kernel_rt_sigreturn_address =
+ reinterpret_cast<const unsigned char *>(
+ rt_sigreturn_symbol_info.address);
+ kernel_vsyscall_address =
+ reinterpret_cast<const unsigned char *>(
+ vsyscall_symbol_info.address);
+ num_push_instructions =
+ CountPushInstructions(kernel_vsyscall_address);
+ }
+ } else {
+ num_push_instructions = 0;
+ }
+#else // ABSL_HAVE_VDSO_SUPPORT
+ num_push_instructions = 0;
+#endif // ABSL_HAVE_VDSO_SUPPORT
+ }
+ if (num_push_instructions != 0 && kernel_rt_sigreturn_address != nullptr &&
+ old_fp[1] == kernel_rt_sigreturn_address) {
+ const ucontext_t *ucv = static_cast<const ucontext_t *>(uc);
+ // This kernel does not use frame pointer in its VDSO code,
+ // and so %ebp is not suitable for unwinding.
+ void **const reg_ebp =
+ reinterpret_cast<void **>(ucv->uc_mcontext.gregs[REG_EBP]);
+ const unsigned char *const reg_eip =
+ reinterpret_cast<unsigned char *>(ucv->uc_mcontext.gregs[REG_EIP]);
+ if (new_fp == reg_ebp && kernel_vsyscall_address <= reg_eip &&
+ reg_eip - kernel_vsyscall_address < kMaxBytes) {
+ // We "stepped up" to __kernel_vsyscall, but %ebp is not usable.
+ // Restore from 'ucv' instead.
+ void **const reg_esp =
+ reinterpret_cast<void **>(ucv->uc_mcontext.gregs[REG_ESP]);
+ // Check that alleged %esp is not null and is reasonably aligned.
+ if (reg_esp &&
+ ((uintptr_t)reg_esp & (sizeof(reg_esp) - 1)) == 0) {
+ // Check that alleged %esp is actually readable. This is to prevent
+ // "double fault" in case we hit the first fault due to e.g. stack
+ // corruption.
+ void *const reg_esp2 = reg_esp[num_push_instructions - 1];
+ if (AddressIsReadable(reg_esp2)) {
+ // Alleged %esp is readable, use it for further unwinding.
+ new_fp = reinterpret_cast<void **>(reg_esp2);
+ }
+ }
+ }
+ }
+ }
+#endif
+
+ const uintptr_t old_fp_u = reinterpret_cast<uintptr_t>(old_fp);
+ const uintptr_t new_fp_u = reinterpret_cast<uintptr_t>(new_fp);
+
+ // Check that the transition from frame pointer old_fp to frame
+ // pointer new_fp isn't clearly bogus. Skip the checks if new_fp
+ // matches the signal context, so that we don't skip out early when
+ // using an alternate signal stack.
+ //
+ // TODO(bcmills): The GetFP call should be completely unnecessary when
+ // SHRINK_WRAP_FRAME_POINTER is set (because we should be back in the thread's
+ // stack by this point), but it is empirically still needed (e.g. when the
+ // stack includes a call to abort). unw_get_reg returns UNW_EBADREG for some
+ // frames. Figure out why GetValidFrameAddr and/or libunwind isn't doing what
+ // it's supposed to.
+ if (STRICT_UNWINDING &&
+ (!WITH_CONTEXT || uc == nullptr || new_fp_u != GetFP(uc))) {
+ // With the stack growing downwards, older stack frame must be
+ // at a greater address that the current one.
+ if (new_fp_u <= old_fp_u) return nullptr;
+ if (new_fp_u - old_fp_u > kMaxFrameBytes) return nullptr;
+ } else {
+ if (new_fp == nullptr) return nullptr; // skip AddressIsReadable() below
+ // In the non-strict mode, allow discontiguous stack frames.
+ // (alternate-signal-stacks for example).
+ if (new_fp == old_fp) return nullptr;
+ }
+
+ if (new_fp_u & (sizeof(void *) - 1)) return nullptr;
+#ifdef __i386__
+ // On 32-bit machines, the stack pointer can be very close to
+ // 0xffffffff, so we explicitly check for a pointer into the
+ // last two pages in the address space
+ if (new_fp_u >= 0xffffe000) return nullptr;
+#endif
+#if !defined(_WIN32)
+ if (!STRICT_UNWINDING) {
+ // Lax sanity checks cause a crash in 32-bit tcmalloc/crash_reason_test
+ // on AMD-based machines with VDSO-enabled kernels.
+ // Make an extra sanity check to insure new_fp is readable.
+ // Note: NextStackFrame<false>() is only called while the program
+ // is already on its last leg, so it's ok to be slow here.
+
+ if (!AddressIsReadable(new_fp)) {
+ return nullptr;
+ }
+ }
+#endif
+ return new_fp;
+}
+
+template <bool IS_STACK_FRAMES, bool IS_WITH_CONTEXT>
+ABSL_ATTRIBUTE_NO_SANITIZE_ADDRESS // May read random elements from stack.
+ABSL_ATTRIBUTE_NO_SANITIZE_MEMORY // May read random elements from stack.
+ABSL_ATTRIBUTE_NOINLINE
+static int UnwindImpl(void **result, int *sizes, int max_depth, int skip_count,
+ const void *ucp, int *min_dropped_frames) {
+ int n = 0;
+ void **fp = reinterpret_cast<void **>(__builtin_frame_address(0));
+
+ while (fp && n < max_depth) {
+ if (*(fp + 1) == reinterpret_cast<void *>(0)) {
+ // In 64-bit code, we often see a frame that
+ // points to itself and has a return address of 0.
+ break;
+ }
+ void **next_fp = NextStackFrame<!IS_STACK_FRAMES, IS_WITH_CONTEXT>(fp, ucp);
+ if (skip_count > 0) {
+ skip_count--;
+ } else {
+ result[n] = *(fp + 1);
+ if (IS_STACK_FRAMES) {
+ if (next_fp > fp) {
+ sizes[n] = (uintptr_t)next_fp - (uintptr_t)fp;
+ } else {
+ // A frame-size of 0 is used to indicate unknown frame size.
+ sizes[n] = 0;
+ }
+ }
+ n++;
+ }
+ fp = next_fp;
+ }
+ if (min_dropped_frames != nullptr) {
+ // Implementation detail: we clamp the max of frames we are willing to
+ // count, so as not to spend too much time in the loop below.
+ const int kMaxUnwind = 1000;
+ int j = 0;
+ for (; fp != nullptr && j < kMaxUnwind; j++) {
+ fp = NextStackFrame<!IS_STACK_FRAMES, IS_WITH_CONTEXT>(fp, ucp);
+ }
+ *min_dropped_frames = j;
+ }
+ return n;
+}
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace debugging_internal {
+bool StackTraceWorksForTest() {
+ return true;
+}
+} // namespace debugging_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_DEBUGGING_INTERNAL_STACKTRACE_X86_INL_INC_
diff --git a/third_party/abseil/src/absl/debugging/internal/symbolize.h b/third_party/abseil/src/absl/debugging/internal/symbolize.h
new file mode 100644
index 0000000..4f26130
--- /dev/null
+++ b/third_party/abseil/src/absl/debugging/internal/symbolize.h
@@ -0,0 +1,147 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// This file contains internal parts of the Abseil symbolizer.
+// Do not depend on the anything in this file, it may change at anytime.
+
+#ifndef ABSL_DEBUGGING_INTERNAL_SYMBOLIZE_H_
+#define ABSL_DEBUGGING_INTERNAL_SYMBOLIZE_H_
+
+#ifdef __cplusplus
+
+#include <cstddef>
+#include <cstdint>
+
+#include "absl/base/config.h"
+#include "absl/strings/string_view.h"
+
+#ifdef ABSL_INTERNAL_HAVE_ELF_SYMBOLIZE
+#error ABSL_INTERNAL_HAVE_ELF_SYMBOLIZE cannot be directly set
+#elif defined(__ELF__) && defined(__GLIBC__) && !defined(__native_client__) && \
+ !defined(__asmjs__) && !defined(__wasm__)
+#define ABSL_INTERNAL_HAVE_ELF_SYMBOLIZE 1
+
+#include <elf.h>
+#include <link.h> // For ElfW() macro.
+#include <functional>
+#include <string>
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace debugging_internal {
+
+// Iterates over all sections, invoking callback on each with the section name
+// and the section header.
+//
+// Returns true on success; otherwise returns false in case of errors.
+//
+// This is not async-signal-safe.
+bool ForEachSection(int fd,
+ const std::function<bool(absl::string_view name,
+ const ElfW(Shdr) &)>& callback);
+
+// Gets the section header for the given name, if it exists. Returns true on
+// success. Otherwise, returns false.
+bool GetSectionHeaderByName(int fd, const char *name, size_t name_len,
+ ElfW(Shdr) *out);
+
+} // namespace debugging_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_INTERNAL_HAVE_ELF_SYMBOLIZE
+
+#ifdef ABSL_INTERNAL_HAVE_DARWIN_SYMBOLIZE
+#error ABSL_INTERNAL_HAVE_DARWIN_SYMBOLIZE cannot be directly set
+#elif defined(__APPLE__)
+#define ABSL_INTERNAL_HAVE_DARWIN_SYMBOLIZE 1
+#endif
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace debugging_internal {
+
+struct SymbolDecoratorArgs {
+ // The program counter we are getting symbolic name for.
+ const void *pc;
+ // 0 for main executable, load address for shared libraries.
+ ptrdiff_t relocation;
+ // Read-only file descriptor for ELF image covering "pc",
+ // or -1 if no such ELF image exists in /proc/self/maps.
+ int fd;
+ // Output buffer, size.
+ // Note: the buffer may not be empty -- default symbolizer may have already
+ // produced some output, and earlier decorators may have adorned it in
+ // some way. You are free to replace or augment the contents (within the
+ // symbol_buf_size limit).
+ char *const symbol_buf;
+ size_t symbol_buf_size;
+ // Temporary scratch space, size.
+ // Use that space in preference to allocating your own stack buffer to
+ // conserve stack.
+ char *const tmp_buf;
+ size_t tmp_buf_size;
+ // User-provided argument
+ void* arg;
+};
+using SymbolDecorator = void (*)(const SymbolDecoratorArgs *);
+
+// Installs a function-pointer as a decorator. Returns a value less than zero
+// if the system cannot install the decorator. Otherwise, returns a unique
+// identifier corresponding to the decorator. This identifier can be used to
+// uninstall the decorator - See RemoveSymbolDecorator() below.
+int InstallSymbolDecorator(SymbolDecorator decorator, void* arg);
+
+// Removes a previously installed function-pointer decorator. Parameter "ticket"
+// is the return-value from calling InstallSymbolDecorator().
+bool RemoveSymbolDecorator(int ticket);
+
+// Remove all installed decorators. Returns true if successful, false if
+// symbolization is currently in progress.
+bool RemoveAllSymbolDecorators(void);
+
+// Registers an address range to a file mapping.
+//
+// Preconditions:
+// start <= end
+// filename != nullptr
+//
+// Returns true if the file was successfully registered.
+bool RegisterFileMappingHint(const void* start, const void* end,
+ uint64_t offset, const char* filename);
+
+// Looks up the file mapping registered by RegisterFileMappingHint for an
+// address range. If there is one, the file name is stored in *filename and
+// *start and *end are modified to reflect the registered mapping. Returns
+// whether any hint was found.
+bool GetFileMappingHint(const void** start, const void** end, uint64_t* offset,
+ const char** filename);
+
+} // namespace debugging_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // __cplusplus
+
+#include <stdbool.h>
+
+#ifdef __cplusplus
+extern "C"
+#endif // __cplusplus
+
+ bool
+ AbslInternalGetFileMappingHint(const void** start, const void** end,
+ uint64_t* offset, const char** filename);
+
+#endif // ABSL_DEBUGGING_INTERNAL_SYMBOLIZE_H_
diff --git a/third_party/abseil/src/absl/debugging/internal/vdso_support.cc b/third_party/abseil/src/absl/debugging/internal/vdso_support.cc
new file mode 100644
index 0000000..6be16d9
--- /dev/null
+++ b/third_party/abseil/src/absl/debugging/internal/vdso_support.cc
@@ -0,0 +1,173 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Allow dynamic symbol lookup in the kernel VDSO page.
+//
+// VDSOSupport -- a class representing kernel VDSO (if present).
+
+#include "absl/debugging/internal/vdso_support.h"
+
+#ifdef ABSL_HAVE_VDSO_SUPPORT // defined in vdso_support.h
+
+#include <errno.h>
+#include <fcntl.h>
+#include <sys/syscall.h>
+#include <unistd.h>
+
+#if __GLIBC_PREREQ(2, 16) // GLIBC-2.16 implements getauxval.
+#include <sys/auxv.h>
+#endif
+
+#include "absl/base/dynamic_annotations.h"
+#include "absl/base/internal/raw_logging.h"
+#include "absl/base/port.h"
+
+#ifndef AT_SYSINFO_EHDR
+#define AT_SYSINFO_EHDR 33 // for crosstoolv10
+#endif
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace debugging_internal {
+
+ABSL_CONST_INIT
+std::atomic<const void *> VDSOSupport::vdso_base_(
+ debugging_internal::ElfMemImage::kInvalidBase);
+
+std::atomic<VDSOSupport::GetCpuFn> VDSOSupport::getcpu_fn_(&InitAndGetCPU);
+VDSOSupport::VDSOSupport()
+ // If vdso_base_ is still set to kInvalidBase, we got here
+ // before VDSOSupport::Init has been called. Call it now.
+ : image_(vdso_base_.load(std::memory_order_relaxed) ==
+ debugging_internal::ElfMemImage::kInvalidBase
+ ? Init()
+ : vdso_base_.load(std::memory_order_relaxed)) {}
+
+// NOTE: we can't use GoogleOnceInit() below, because we can be
+// called by tcmalloc, and none of the *once* stuff may be functional yet.
+//
+// In addition, we hope that the VDSOSupportHelper constructor
+// causes this code to run before there are any threads, and before
+// InitGoogle() has executed any chroot or setuid calls.
+//
+// Finally, even if there is a race here, it is harmless, because
+// the operation should be idempotent.
+const void *VDSOSupport::Init() {
+ const auto kInvalidBase = debugging_internal::ElfMemImage::kInvalidBase;
+#if __GLIBC_PREREQ(2, 16)
+ if (vdso_base_.load(std::memory_order_relaxed) == kInvalidBase) {
+ errno = 0;
+ const void *const sysinfo_ehdr =
+ reinterpret_cast<const void *>(getauxval(AT_SYSINFO_EHDR));
+ if (errno == 0) {
+ vdso_base_.store(sysinfo_ehdr, std::memory_order_relaxed);
+ }
+ }
+#endif // __GLIBC_PREREQ(2, 16)
+ if (vdso_base_.load(std::memory_order_relaxed) == kInvalidBase) {
+ int fd = open("/proc/self/auxv", O_RDONLY);
+ if (fd == -1) {
+ // Kernel too old to have a VDSO.
+ vdso_base_.store(nullptr, std::memory_order_relaxed);
+ getcpu_fn_.store(&GetCPUViaSyscall, std::memory_order_relaxed);
+ return nullptr;
+ }
+ ElfW(auxv_t) aux;
+ while (read(fd, &aux, sizeof(aux)) == sizeof(aux)) {
+ if (aux.a_type == AT_SYSINFO_EHDR) {
+ vdso_base_.store(reinterpret_cast<void *>(aux.a_un.a_val),
+ std::memory_order_relaxed);
+ break;
+ }
+ }
+ close(fd);
+ if (vdso_base_.load(std::memory_order_relaxed) == kInvalidBase) {
+ // Didn't find AT_SYSINFO_EHDR in auxv[].
+ vdso_base_.store(nullptr, std::memory_order_relaxed);
+ }
+ }
+ GetCpuFn fn = &GetCPUViaSyscall; // default if VDSO not present.
+ if (vdso_base_.load(std::memory_order_relaxed)) {
+ VDSOSupport vdso;
+ SymbolInfo info;
+ if (vdso.LookupSymbol("__vdso_getcpu", "LINUX_2.6", STT_FUNC, &info)) {
+ fn = reinterpret_cast<GetCpuFn>(const_cast<void *>(info.address));
+ }
+ }
+ // Subtle: this code runs outside of any locks; prevent compiler
+ // from assigning to getcpu_fn_ more than once.
+ getcpu_fn_.store(fn, std::memory_order_relaxed);
+ return vdso_base_.load(std::memory_order_relaxed);
+}
+
+const void *VDSOSupport::SetBase(const void *base) {
+ ABSL_RAW_CHECK(base != debugging_internal::ElfMemImage::kInvalidBase,
+ "internal error");
+ const void *old_base = vdso_base_.load(std::memory_order_relaxed);
+ vdso_base_.store(base, std::memory_order_relaxed);
+ image_.Init(base);
+ // Also reset getcpu_fn_, so GetCPU could be tested with simulated VDSO.
+ getcpu_fn_.store(&InitAndGetCPU, std::memory_order_relaxed);
+ return old_base;
+}
+
+bool VDSOSupport::LookupSymbol(const char *name,
+ const char *version,
+ int type,
+ SymbolInfo *info) const {
+ return image_.LookupSymbol(name, version, type, info);
+}
+
+bool VDSOSupport::LookupSymbolByAddress(const void *address,
+ SymbolInfo *info_out) const {
+ return image_.LookupSymbolByAddress(address, info_out);
+}
+
+// NOLINT on 'long' because this routine mimics kernel api.
+long VDSOSupport::GetCPUViaSyscall(unsigned *cpu, // NOLINT(runtime/int)
+ void *, void *) {
+#ifdef SYS_getcpu
+ return syscall(SYS_getcpu, cpu, nullptr, nullptr);
+#else
+ // x86_64 never implemented sys_getcpu(), except as a VDSO call.
+ static_cast<void>(cpu); // Avoid an unused argument compiler warning.
+ errno = ENOSYS;
+ return -1;
+#endif
+}
+
+// Use fast __vdso_getcpu if available.
+long VDSOSupport::InitAndGetCPU(unsigned *cpu, // NOLINT(runtime/int)
+ void *x, void *y) {
+ Init();
+ GetCpuFn fn = getcpu_fn_.load(std::memory_order_relaxed);
+ ABSL_RAW_CHECK(fn != &InitAndGetCPU, "Init() did not set getcpu_fn_");
+ return (*fn)(cpu, x, y);
+}
+
+// This function must be very fast, and may be called from very
+// low level (e.g. tcmalloc). Hence I avoid things like
+// GoogleOnceInit() and ::operator new.
+ABSL_ATTRIBUTE_NO_SANITIZE_MEMORY
+int GetCPU() {
+ unsigned cpu;
+ int ret_code = (*VDSOSupport::getcpu_fn_)(&cpu, nullptr, nullptr);
+ return ret_code == 0 ? cpu : ret_code;
+}
+
+} // namespace debugging_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_HAVE_VDSO_SUPPORT
diff --git a/third_party/abseil/src/absl/debugging/internal/vdso_support.h b/third_party/abseil/src/absl/debugging/internal/vdso_support.h
new file mode 100644
index 0000000..6562c6c
--- /dev/null
+++ b/third_party/abseil/src/absl/debugging/internal/vdso_support.h
@@ -0,0 +1,158 @@
+//
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+// Allow dynamic symbol lookup in the kernel VDSO page.
+//
+// VDSO stands for "Virtual Dynamic Shared Object" -- a page of
+// executable code, which looks like a shared library, but doesn't
+// necessarily exist anywhere on disk, and which gets mmap()ed into
+// every process by kernels which support VDSO, such as 2.6.x for 32-bit
+// executables, and 2.6.24 and above for 64-bit executables.
+//
+// More details could be found here:
+// http://www.trilithium.com/johan/2005/08/linux-gate/
+//
+// VDSOSupport -- a class representing kernel VDSO (if present).
+//
+// Example usage:
+// VDSOSupport vdso;
+// VDSOSupport::SymbolInfo info;
+// typedef (*FN)(unsigned *, void *, void *);
+// FN fn = nullptr;
+// if (vdso.LookupSymbol("__vdso_getcpu", "LINUX_2.6", STT_FUNC, &info)) {
+// fn = reinterpret_cast<FN>(info.address);
+// }
+
+#ifndef ABSL_DEBUGGING_INTERNAL_VDSO_SUPPORT_H_
+#define ABSL_DEBUGGING_INTERNAL_VDSO_SUPPORT_H_
+
+#include <atomic>
+
+#include "absl/base/attributes.h"
+#include "absl/debugging/internal/elf_mem_image.h"
+
+#ifdef ABSL_HAVE_ELF_MEM_IMAGE
+
+#ifdef ABSL_HAVE_VDSO_SUPPORT
+#error ABSL_HAVE_VDSO_SUPPORT cannot be directly set
+#else
+#define ABSL_HAVE_VDSO_SUPPORT 1
+#endif
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace debugging_internal {
+
+// NOTE: this class may be used from within tcmalloc, and can not
+// use any memory allocation routines.
+class VDSOSupport {
+ public:
+ VDSOSupport();
+
+ typedef ElfMemImage::SymbolInfo SymbolInfo;
+ typedef ElfMemImage::SymbolIterator SymbolIterator;
+
+ // On PowerPC64 VDSO symbols can either be of type STT_FUNC or STT_NOTYPE
+ // depending on how the kernel is built. The kernel is normally built with
+ // STT_NOTYPE type VDSO symbols. Let's make things simpler first by using a
+ // compile-time constant.
+#ifdef __powerpc64__
+ enum { kVDSOSymbolType = STT_NOTYPE };
+#else
+ enum { kVDSOSymbolType = STT_FUNC };
+#endif
+
+ // Answers whether we have a vdso at all.
+ bool IsPresent() const { return image_.IsPresent(); }
+
+ // Allow to iterate over all VDSO symbols.
+ SymbolIterator begin() const { return image_.begin(); }
+ SymbolIterator end() const { return image_.end(); }
+
+ // Look up versioned dynamic symbol in the kernel VDSO.
+ // Returns false if VDSO is not present, or doesn't contain given
+ // symbol/version/type combination.
+ // If info_out != nullptr, additional details are filled in.
+ bool LookupSymbol(const char *name, const char *version,
+ int symbol_type, SymbolInfo *info_out) const;
+
+ // Find info about symbol (if any) which overlaps given address.
+ // Returns true if symbol was found; false if VDSO isn't present
+ // or doesn't have a symbol overlapping given address.
+ // If info_out != nullptr, additional details are filled in.
+ bool LookupSymbolByAddress(const void *address, SymbolInfo *info_out) const;
+
+ // Used only for testing. Replace real VDSO base with a mock.
+ // Returns previous value of vdso_base_. After you are done testing,
+ // you are expected to call SetBase() with previous value, in order to
+ // reset state to the way it was.
+ const void *SetBase(const void *s);
+
+ // Computes vdso_base_ and returns it. Should be called as early as
+ // possible; before any thread creation, chroot or setuid.
+ static const void *Init();
+
+ private:
+ // image_ represents VDSO ELF image in memory.
+ // image_.ehdr_ == nullptr implies there is no VDSO.
+ ElfMemImage image_;
+
+ // Cached value of auxv AT_SYSINFO_EHDR, computed once.
+ // This is a tri-state:
+ // kInvalidBase => value hasn't been determined yet.
+ // 0 => there is no VDSO.
+ // else => vma of VDSO Elf{32,64}_Ehdr.
+ //
+ // When testing with mock VDSO, low bit is set.
+ // The low bit is always available because vdso_base_ is
+ // page-aligned.
+ static std::atomic<const void *> vdso_base_;
+
+ // NOLINT on 'long' because these routines mimic kernel api.
+ // The 'cache' parameter may be used by some versions of the kernel,
+ // and should be nullptr or point to a static buffer containing at
+ // least two 'long's.
+ static long InitAndGetCPU(unsigned *cpu, void *cache, // NOLINT 'long'.
+ void *unused);
+ static long GetCPUViaSyscall(unsigned *cpu, void *cache, // NOLINT 'long'.
+ void *unused);
+ typedef long (*GetCpuFn)(unsigned *cpu, void *cache, // NOLINT 'long'.
+ void *unused);
+
+ // This function pointer may point to InitAndGetCPU,
+ // GetCPUViaSyscall, or __vdso_getcpu at different stages of initialization.
+ ABSL_CONST_INIT static std::atomic<GetCpuFn> getcpu_fn_;
+
+ friend int GetCPU(void); // Needs access to getcpu_fn_.
+
+ VDSOSupport(const VDSOSupport&) = delete;
+ VDSOSupport& operator=(const VDSOSupport&) = delete;
+};
+
+// Same as sched_getcpu() on later glibc versions.
+// Return current CPU, using (fast) __vdso_getcpu@LINUX_2.6 if present,
+// otherwise use syscall(SYS_getcpu,...).
+// May return -1 with errno == ENOSYS if the kernel doesn't
+// support SYS_getcpu.
+int GetCPU();
+
+} // namespace debugging_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_HAVE_ELF_MEM_IMAGE
+
+#endif // ABSL_DEBUGGING_INTERNAL_VDSO_SUPPORT_H_
diff --git a/third_party/abseil/src/absl/debugging/leak_check.cc b/third_party/abseil/src/absl/debugging/leak_check.cc
new file mode 100644
index 0000000..ff90495
--- /dev/null
+++ b/third_party/abseil/src/absl/debugging/leak_check.cc
@@ -0,0 +1,53 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Wrappers around lsan_interface functions.
+// When lsan is not linked in, these functions are not available,
+// therefore Abseil code which depends on these functions is conditioned on the
+// definition of LEAK_SANITIZER.
+#include "absl/debugging/leak_check.h"
+
+#ifndef LEAK_SANITIZER
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+bool HaveLeakSanitizer() { return false; }
+void DoIgnoreLeak(const void*) { }
+void RegisterLivePointers(const void*, size_t) { }
+void UnRegisterLivePointers(const void*, size_t) { }
+LeakCheckDisabler::LeakCheckDisabler() { }
+LeakCheckDisabler::~LeakCheckDisabler() { }
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#else
+
+#include <sanitizer/lsan_interface.h>
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+bool HaveLeakSanitizer() { return true; }
+void DoIgnoreLeak(const void* ptr) { __lsan_ignore_object(ptr); }
+void RegisterLivePointers(const void* ptr, size_t size) {
+ __lsan_register_root_region(ptr, size);
+}
+void UnRegisterLivePointers(const void* ptr, size_t size) {
+ __lsan_unregister_root_region(ptr, size);
+}
+LeakCheckDisabler::LeakCheckDisabler() { __lsan_disable(); }
+LeakCheckDisabler::~LeakCheckDisabler() { __lsan_enable(); }
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // LEAK_SANITIZER
diff --git a/third_party/abseil/src/absl/debugging/leak_check.h b/third_party/abseil/src/absl/debugging/leak_check.h
new file mode 100644
index 0000000..7a5a22d
--- /dev/null
+++ b/third_party/abseil/src/absl/debugging/leak_check.h
@@ -0,0 +1,113 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: leak_check.h
+// -----------------------------------------------------------------------------
+//
+// This file contains functions that affect leak checking behavior within
+// targets built with the LeakSanitizer (LSan), a memory leak detector that is
+// integrated within the AddressSanitizer (ASan) as an additional component, or
+// which can be used standalone. LSan and ASan are included (or can be provided)
+// as additional components for most compilers such as Clang, gcc and MSVC.
+// Note: this leak checking API is not yet supported in MSVC.
+// Leak checking is enabled by default in all ASan builds.
+//
+// See https://github.com/google/sanitizers/wiki/AddressSanitizerLeakSanitizer
+//
+// -----------------------------------------------------------------------------
+#ifndef ABSL_DEBUGGING_LEAK_CHECK_H_
+#define ABSL_DEBUGGING_LEAK_CHECK_H_
+
+#include <cstddef>
+
+#include "absl/base/config.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+// HaveLeakSanitizer()
+//
+// Returns true if a leak-checking sanitizer (either ASan or standalone LSan) is
+// currently built into this target.
+bool HaveLeakSanitizer();
+
+// DoIgnoreLeak()
+//
+// Implements `IgnoreLeak()` below. This function should usually
+// not be called directly; calling `IgnoreLeak()` is preferred.
+void DoIgnoreLeak(const void* ptr);
+
+// IgnoreLeak()
+//
+// Instruct the leak sanitizer to ignore leak warnings on the object referenced
+// by the passed pointer, as well as all heap objects transitively referenced
+// by it. The passed object pointer can point to either the beginning of the
+// object or anywhere within it.
+//
+// Example:
+//
+// static T* obj = IgnoreLeak(new T(...));
+//
+// If the passed `ptr` does not point to an actively allocated object at the
+// time `IgnoreLeak()` is called, the call is a no-op; if it is actively
+// allocated, the object must not get deallocated later.
+//
+template <typename T>
+T* IgnoreLeak(T* ptr) {
+ DoIgnoreLeak(ptr);
+ return ptr;
+}
+
+// LeakCheckDisabler
+//
+// This helper class indicates that any heap allocations done in the code block
+// covered by the scoped object, which should be allocated on the stack, will
+// not be reported as leaks. Leak check disabling will occur within the code
+// block and any nested function calls within the code block.
+//
+// Example:
+//
+// void Foo() {
+// LeakCheckDisabler disabler;
+// ... code that allocates objects whose leaks should be ignored ...
+// }
+//
+// REQUIRES: Destructor runs in same thread as constructor
+class LeakCheckDisabler {
+ public:
+ LeakCheckDisabler();
+ LeakCheckDisabler(const LeakCheckDisabler&) = delete;
+ LeakCheckDisabler& operator=(const LeakCheckDisabler&) = delete;
+ ~LeakCheckDisabler();
+};
+
+// RegisterLivePointers()
+//
+// Registers `ptr[0,size-1]` as pointers to memory that is still actively being
+// referenced and for which leak checking should be ignored. This function is
+// useful if you store pointers in mapped memory, for memory ranges that we know
+// are correct but for which normal analysis would flag as leaked code.
+void RegisterLivePointers(const void* ptr, size_t size);
+
+// UnRegisterLivePointers()
+//
+// Deregisters the pointers previously marked as active in
+// `RegisterLivePointers()`, enabling leak checking of those pointers.
+void UnRegisterLivePointers(const void* ptr, size_t size);
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_DEBUGGING_LEAK_CHECK_H_
diff --git a/third_party/abseil/src/absl/debugging/leak_check_disable.cc b/third_party/abseil/src/absl/debugging/leak_check_disable.cc
new file mode 100644
index 0000000..924d6e3
--- /dev/null
+++ b/third_party/abseil/src/absl/debugging/leak_check_disable.cc
@@ -0,0 +1,20 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Disable LeakSanitizer when this file is linked in.
+// This function overrides __lsan_is_turned_off from sanitizer/lsan_interface.h
+extern "C" int __lsan_is_turned_off();
+extern "C" int __lsan_is_turned_off() {
+ return 1;
+}
diff --git a/third_party/abseil/src/absl/debugging/leak_check_fail_test.cc b/third_party/abseil/src/absl/debugging/leak_check_fail_test.cc
new file mode 100644
index 0000000..c49b81a
--- /dev/null
+++ b/third_party/abseil/src/absl/debugging/leak_check_fail_test.cc
@@ -0,0 +1,41 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <memory>
+#include "gtest/gtest.h"
+#include "absl/base/internal/raw_logging.h"
+#include "absl/debugging/leak_check.h"
+
+namespace {
+
+TEST(LeakCheckTest, LeakMemory) {
+ // This test is expected to cause lsan failures on program exit. Therefore the
+ // test will be run only by leak_check_test.sh, which will verify a
+ // failed exit code.
+
+ char* foo = strdup("lsan should complain about this leaked string");
+ ABSL_RAW_LOG(INFO, "Should detect leaked string %s", foo);
+}
+
+TEST(LeakCheckTest, LeakMemoryAfterDisablerScope) {
+ // This test is expected to cause lsan failures on program exit. Therefore the
+ // test will be run only by external_leak_check_test.sh, which will verify a
+ // failed exit code.
+ { absl::LeakCheckDisabler disabler; }
+ char* foo = strdup("lsan should also complain about this leaked string");
+ ABSL_RAW_LOG(INFO, "Re-enabled leak detection.Should detect leaked string %s",
+ foo);
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/debugging/leak_check_test.cc b/third_party/abseil/src/absl/debugging/leak_check_test.cc
new file mode 100644
index 0000000..b5cc487
--- /dev/null
+++ b/third_party/abseil/src/absl/debugging/leak_check_test.cc
@@ -0,0 +1,42 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <string>
+
+#include "gtest/gtest.h"
+#include "absl/base/internal/raw_logging.h"
+#include "absl/debugging/leak_check.h"
+
+namespace {
+
+TEST(LeakCheckTest, DetectLeakSanitizer) {
+#ifdef ABSL_EXPECT_LEAK_SANITIZER
+ EXPECT_TRUE(absl::HaveLeakSanitizer());
+#else
+ EXPECT_FALSE(absl::HaveLeakSanitizer());
+#endif
+}
+
+TEST(LeakCheckTest, IgnoreLeakSuppressesLeakedMemoryErrors) {
+ auto foo = absl::IgnoreLeak(new std::string("some ignored leaked string"));
+ ABSL_RAW_LOG(INFO, "Ignoring leaked string %s", foo->c_str());
+}
+
+TEST(LeakCheckTest, LeakCheckDisablerIgnoresLeak) {
+ absl::LeakCheckDisabler disabler;
+ auto foo = new std::string("some string leaked while checks are disabled");
+ ABSL_RAW_LOG(INFO, "Ignoring leaked string %s", foo->c_str());
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/debugging/stacktrace.cc b/third_party/abseil/src/absl/debugging/stacktrace.cc
new file mode 100644
index 0000000..1f7c7d8
--- /dev/null
+++ b/third_party/abseil/src/absl/debugging/stacktrace.cc
@@ -0,0 +1,140 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Produce stack trace.
+//
+// There are three different ways we can try to get the stack trace:
+//
+// 1) Our hand-coded stack-unwinder. This depends on a certain stack
+// layout, which is used by gcc (and those systems using a
+// gcc-compatible ABI) on x86 systems, at least since gcc 2.95.
+// It uses the frame pointer to do its work.
+//
+// 2) The libunwind library. This is still in development, and as a
+// separate library adds a new dependency, but doesn't need a frame
+// pointer. It also doesn't call malloc.
+//
+// 3) The gdb unwinder -- also the one used by the c++ exception code.
+// It's obviously well-tested, but has a fatal flaw: it can call
+// malloc() from the unwinder. This is a problem because we're
+// trying to use the unwinder to instrument malloc().
+//
+// Note: if you add a new implementation here, make sure it works
+// correctly when absl::GetStackTrace() is called with max_depth == 0.
+// Some code may do that.
+
+#include "absl/debugging/stacktrace.h"
+
+#include <atomic>
+
+#include "absl/base/attributes.h"
+#include "absl/base/port.h"
+#include "absl/debugging/internal/stacktrace_config.h"
+
+#if defined(ABSL_STACKTRACE_INL_HEADER)
+#include ABSL_STACKTRACE_INL_HEADER
+#else
+# error Cannot calculate stack trace: will need to write for your environment
+
+# include "absl/debugging/internal/stacktrace_aarch64-inl.inc"
+# include "absl/debugging/internal/stacktrace_arm-inl.inc"
+# include "absl/debugging/internal/stacktrace_generic-inl.inc"
+# include "absl/debugging/internal/stacktrace_powerpc-inl.inc"
+# include "absl/debugging/internal/stacktrace_unimplemented-inl.inc"
+# include "absl/debugging/internal/stacktrace_win32-inl.inc"
+# include "absl/debugging/internal/stacktrace_x86-inl.inc"
+#endif
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace {
+
+typedef int (*Unwinder)(void**, int*, int, int, const void*, int*);
+std::atomic<Unwinder> custom;
+
+template <bool IS_STACK_FRAMES, bool IS_WITH_CONTEXT>
+ABSL_ATTRIBUTE_ALWAYS_INLINE inline int Unwind(void** result, int* sizes,
+ int max_depth, int skip_count,
+ const void* uc,
+ int* min_dropped_frames) {
+ Unwinder f = &UnwindImpl<IS_STACK_FRAMES, IS_WITH_CONTEXT>;
+ Unwinder g = custom.load(std::memory_order_acquire);
+ if (g != nullptr) f = g;
+
+ // Add 1 to skip count for the unwinder function itself
+ int size = (*f)(result, sizes, max_depth, skip_count + 1, uc,
+ min_dropped_frames);
+ // To disable tail call to (*f)(...)
+ ABSL_BLOCK_TAIL_CALL_OPTIMIZATION();
+ return size;
+}
+
+} // anonymous namespace
+
+ABSL_ATTRIBUTE_NOINLINE ABSL_ATTRIBUTE_NO_TAIL_CALL int GetStackFrames(
+ void** result, int* sizes, int max_depth, int skip_count) {
+ return Unwind<true, false>(result, sizes, max_depth, skip_count, nullptr,
+ nullptr);
+}
+
+ABSL_ATTRIBUTE_NOINLINE ABSL_ATTRIBUTE_NO_TAIL_CALL int
+GetStackFramesWithContext(void** result, int* sizes, int max_depth,
+ int skip_count, const void* uc,
+ int* min_dropped_frames) {
+ return Unwind<true, true>(result, sizes, max_depth, skip_count, uc,
+ min_dropped_frames);
+}
+
+ABSL_ATTRIBUTE_NOINLINE ABSL_ATTRIBUTE_NO_TAIL_CALL int GetStackTrace(
+ void** result, int max_depth, int skip_count) {
+ return Unwind<false, false>(result, nullptr, max_depth, skip_count, nullptr,
+ nullptr);
+}
+
+ABSL_ATTRIBUTE_NOINLINE ABSL_ATTRIBUTE_NO_TAIL_CALL int
+GetStackTraceWithContext(void** result, int max_depth, int skip_count,
+ const void* uc, int* min_dropped_frames) {
+ return Unwind<false, true>(result, nullptr, max_depth, skip_count, uc,
+ min_dropped_frames);
+}
+
+void SetStackUnwinder(Unwinder w) {
+ custom.store(w, std::memory_order_release);
+}
+
+int DefaultStackUnwinder(void** pcs, int* sizes, int depth, int skip,
+ const void* uc, int* min_dropped_frames) {
+ skip++; // For this function
+ Unwinder f = nullptr;
+ if (sizes == nullptr) {
+ if (uc == nullptr) {
+ f = &UnwindImpl<false, false>;
+ } else {
+ f = &UnwindImpl<false, true>;
+ }
+ } else {
+ if (uc == nullptr) {
+ f = &UnwindImpl<true, false>;
+ } else {
+ f = &UnwindImpl<true, true>;
+ }
+ }
+ volatile int x = 0;
+ int n = (*f)(pcs, sizes, depth, skip, uc, min_dropped_frames);
+ x = 1; (void) x; // To disable tail call to (*f)(...)
+ return n;
+}
+
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/debugging/stacktrace.h b/third_party/abseil/src/absl/debugging/stacktrace.h
new file mode 100644
index 0000000..0ec0ffd
--- /dev/null
+++ b/third_party/abseil/src/absl/debugging/stacktrace.h
@@ -0,0 +1,231 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: stacktrace.h
+// -----------------------------------------------------------------------------
+//
+// This file contains routines to extract the current stack trace and associated
+// stack frames. These functions are thread-safe and async-signal-safe.
+//
+// Note that stack trace functionality is platform dependent and requires
+// additional support from the compiler/build system in most cases. (That is,
+// this functionality generally only works on platforms/builds that have been
+// specifically configured to support it.)
+//
+// Note: stack traces in Abseil that do not utilize a symbolizer will result in
+// frames consisting of function addresses rather than human-readable function
+// names. (See symbolize.h for information on symbolizing these values.)
+
+#ifndef ABSL_DEBUGGING_STACKTRACE_H_
+#define ABSL_DEBUGGING_STACKTRACE_H_
+
+#include "absl/base/config.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+// GetStackFrames()
+//
+// Records program counter values for up to `max_depth` frames, skipping the
+// most recent `skip_count` stack frames, stores their corresponding values
+// and sizes in `results` and `sizes` buffers, and returns the number of frames
+// stored. (Note that the frame generated for the `absl::GetStackFrames()`
+// routine itself is also skipped.)
+//
+// Example:
+//
+// main() { foo(); }
+// foo() { bar(); }
+// bar() {
+// void* result[10];
+// int sizes[10];
+// int depth = absl::GetStackFrames(result, sizes, 10, 1);
+// }
+//
+// The current stack frame would consist of three function calls: `bar()`,
+// `foo()`, and then `main()`; however, since the `GetStackFrames()` call sets
+// `skip_count` to `1`, it will skip the frame for `bar()`, the most recently
+// invoked function call. It will therefore return 2 and fill `result` with
+// program counters within the following functions:
+//
+// result[0] foo()
+// result[1] main()
+//
+// (Note: in practice, a few more entries after `main()` may be added to account
+// for startup processes.)
+//
+// Corresponding stack frame sizes will also be recorded:
+//
+// sizes[0] 16
+// sizes[1] 16
+//
+// (Stack frame sizes of `16` above are just for illustration purposes.)
+//
+// Stack frame sizes of 0 or less indicate that those frame sizes couldn't
+// be identified.
+//
+// This routine may return fewer stack frame entries than are
+// available. Also note that `result` and `sizes` must both be non-null.
+extern int GetStackFrames(void** result, int* sizes, int max_depth,
+ int skip_count);
+
+// GetStackFramesWithContext()
+//
+// Records program counter values obtained from a signal handler. Records
+// program counter values for up to `max_depth` frames, skipping the most recent
+// `skip_count` stack frames, stores their corresponding values and sizes in
+// `results` and `sizes` buffers, and returns the number of frames stored. (Note
+// that the frame generated for the `absl::GetStackFramesWithContext()` routine
+// itself is also skipped.)
+//
+// The `uc` parameter, if non-null, should be a pointer to a `ucontext_t` value
+// passed to a signal handler registered via the `sa_sigaction` field of a
+// `sigaction` struct. (See
+// http://man7.org/linux/man-pages/man2/sigaction.2.html.) The `uc` value may
+// help a stack unwinder to provide a better stack trace under certain
+// conditions. `uc` may safely be null.
+//
+// The `min_dropped_frames` output parameter, if non-null, points to the
+// location to note any dropped stack frames, if any, due to buffer limitations
+// or other reasons. (This value will be set to `0` if no frames were dropped.)
+// The number of total stack frames is guaranteed to be >= skip_count +
+// max_depth + *min_dropped_frames.
+extern int GetStackFramesWithContext(void** result, int* sizes, int max_depth,
+ int skip_count, const void* uc,
+ int* min_dropped_frames);
+
+// GetStackTrace()
+//
+// Records program counter values for up to `max_depth` frames, skipping the
+// most recent `skip_count` stack frames, stores their corresponding values
+// in `results`, and returns the number of frames
+// stored. Note that this function is similar to `absl::GetStackFrames()`
+// except that it returns the stack trace only, and not stack frame sizes.
+//
+// Example:
+//
+// main() { foo(); }
+// foo() { bar(); }
+// bar() {
+// void* result[10];
+// int depth = absl::GetStackTrace(result, 10, 1);
+// }
+//
+// This produces:
+//
+// result[0] foo
+// result[1] main
+// .... ...
+//
+// `result` must not be null.
+extern int GetStackTrace(void** result, int max_depth, int skip_count);
+
+// GetStackTraceWithContext()
+//
+// Records program counter values obtained from a signal handler. Records
+// program counter values for up to `max_depth` frames, skipping the most recent
+// `skip_count` stack frames, stores their corresponding values in `results`,
+// and returns the number of frames stored. (Note that the frame generated for
+// the `absl::GetStackFramesWithContext()` routine itself is also skipped.)
+//
+// The `uc` parameter, if non-null, should be a pointer to a `ucontext_t` value
+// passed to a signal handler registered via the `sa_sigaction` field of a
+// `sigaction` struct. (See
+// http://man7.org/linux/man-pages/man2/sigaction.2.html.) The `uc` value may
+// help a stack unwinder to provide a better stack trace under certain
+// conditions. `uc` may safely be null.
+//
+// The `min_dropped_frames` output parameter, if non-null, points to the
+// location to note any dropped stack frames, if any, due to buffer limitations
+// or other reasons. (This value will be set to `0` if no frames were dropped.)
+// The number of total stack frames is guaranteed to be >= skip_count +
+// max_depth + *min_dropped_frames.
+extern int GetStackTraceWithContext(void** result, int max_depth,
+ int skip_count, const void* uc,
+ int* min_dropped_frames);
+
+// SetStackUnwinder()
+//
+// Provides a custom function for unwinding stack frames that will be used in
+// place of the default stack unwinder when invoking the static
+// GetStack{Frames,Trace}{,WithContext}() functions above.
+//
+// The arguments passed to the unwinder function will match the
+// arguments passed to `absl::GetStackFramesWithContext()` except that sizes
+// will be non-null iff the caller is interested in frame sizes.
+//
+// If unwinder is set to null, we revert to the default stack-tracing behavior.
+//
+// *****************************************************************************
+// WARNING
+// *****************************************************************************
+//
+// absl::SetStackUnwinder is not suitable for general purpose use. It is
+// provided for custom runtimes.
+// Some things to watch out for when calling `absl::SetStackUnwinder()`:
+//
+// (a) The unwinder may be called from within signal handlers and
+// therefore must be async-signal-safe.
+//
+// (b) Even after a custom stack unwinder has been unregistered, other
+// threads may still be in the process of using that unwinder.
+// Therefore do not clean up any state that may be needed by an old
+// unwinder.
+// *****************************************************************************
+extern void SetStackUnwinder(int (*unwinder)(void** pcs, int* sizes,
+ int max_depth, int skip_count,
+ const void* uc,
+ int* min_dropped_frames));
+
+// DefaultStackUnwinder()
+//
+// Records program counter values of up to `max_depth` frames, skipping the most
+// recent `skip_count` stack frames, and stores their corresponding values in
+// `pcs`. (Note that the frame generated for this call itself is also skipped.)
+// This function acts as a generic stack-unwinder; prefer usage of the more
+// specific `GetStack{Trace,Frames}{,WithContext}()` functions above.
+//
+// If you have set your own stack unwinder (with the `SetStackUnwinder()`
+// function above, you can still get the default stack unwinder by calling
+// `DefaultStackUnwinder()`, which will ignore any previously set stack unwinder
+// and use the default one instead.
+//
+// Because this function is generic, only `pcs` is guaranteed to be non-null
+// upon return. It is legal for `sizes`, `uc`, and `min_dropped_frames` to all
+// be null when called.
+//
+// The semantics are the same as the corresponding `GetStack*()` function in the
+// case where `absl::SetStackUnwinder()` was never called. Equivalents are:
+//
+// null sizes | non-nullptr sizes
+// |==========================================================|
+// null uc | GetStackTrace() | GetStackFrames() |
+// non-null uc | GetStackTraceWithContext() | GetStackFramesWithContext() |
+// |==========================================================|
+extern int DefaultStackUnwinder(void** pcs, int* sizes, int max_depth,
+ int skip_count, const void* uc,
+ int* min_dropped_frames);
+
+namespace debugging_internal {
+// Returns true for platforms which are expected to have functioning stack trace
+// implementations. Intended to be used for tests which want to exclude
+// verification of logic known to be broken because stack traces are not
+// working.
+extern bool StackTraceWorksForTest();
+} // namespace debugging_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_DEBUGGING_STACKTRACE_H_
diff --git a/third_party/abseil/src/absl/debugging/symbolize.cc b/third_party/abseil/src/absl/debugging/symbolize.cc
new file mode 100644
index 0000000..5e4a25d
--- /dev/null
+++ b/third_party/abseil/src/absl/debugging/symbolize.cc
@@ -0,0 +1,36 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/debugging/symbolize.h"
+
+#ifdef _WIN32
+#include <winapifamily.h>
+#if !(WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_APP)) || \
+ WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP)
+// UWP doesn't have access to win32 APIs.
+#define ABSL_INTERNAL_HAVE_SYMBOLIZE_WIN32
+#endif
+#endif
+
+#if defined(ABSL_INTERNAL_HAVE_ELF_SYMBOLIZE)
+#include "absl/debugging/symbolize_elf.inc"
+#elif defined(ABSL_INTERNAL_HAVE_SYMBOLIZE_WIN32)
+// The Windows Symbolizer only works if PDB files containing the debug info
+// are available to the program at runtime.
+#include "absl/debugging/symbolize_win32.inc"
+#elif defined(__APPLE__)
+#include "absl/debugging/symbolize_darwin.inc"
+#else
+#include "absl/debugging/symbolize_unimplemented.inc"
+#endif
diff --git a/third_party/abseil/src/absl/debugging/symbolize.h b/third_party/abseil/src/absl/debugging/symbolize.h
new file mode 100644
index 0000000..43d93a8
--- /dev/null
+++ b/third_party/abseil/src/absl/debugging/symbolize.h
@@ -0,0 +1,99 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: symbolize.h
+// -----------------------------------------------------------------------------
+//
+// This file configures the Abseil symbolizer for use in converting instruction
+// pointer addresses (program counters) into human-readable names (function
+// calls, etc.) within Abseil code.
+//
+// The symbolizer may be invoked from several sources:
+//
+// * Implicitly, through the installation of an Abseil failure signal handler.
+// (See failure_signal_handler.h for more information.)
+// * By calling `Symbolize()` directly on a program counter you obtain through
+// `absl::GetStackTrace()` or `absl::GetStackFrames()`. (See stacktrace.h
+// for more information.
+// * By calling `Symbolize()` directly on a program counter you obtain through
+// other means (which would be platform-dependent).
+//
+// In all of the above cases, the symbolizer must first be initialized before
+// any program counter values can be symbolized. If you are installing a failure
+// signal handler, initialize the symbolizer before you do so.
+//
+// Example:
+//
+// int main(int argc, char** argv) {
+// // Initialize the Symbolizer before installing the failure signal handler
+// absl::InitializeSymbolizer(argv[0]);
+//
+// // Now you may install the failure signal handler
+// absl::FailureSignalHandlerOptions options;
+// absl::InstallFailureSignalHandler(options);
+//
+// // Start running your main program
+// ...
+// return 0;
+// }
+//
+#ifndef ABSL_DEBUGGING_SYMBOLIZE_H_
+#define ABSL_DEBUGGING_SYMBOLIZE_H_
+
+#include "absl/debugging/internal/symbolize.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+// InitializeSymbolizer()
+//
+// Initializes the program counter symbolizer, given the path of the program
+// (typically obtained through `main()`s `argv[0]`). The Abseil symbolizer
+// allows you to read program counters (instruction pointer values) using their
+// human-readable names within output such as stack traces.
+//
+// Example:
+//
+// int main(int argc, char *argv[]) {
+// absl::InitializeSymbolizer(argv[0]);
+// // Now you can use the symbolizer
+// }
+void InitializeSymbolizer(const char* argv0);
+//
+// Symbolize()
+//
+// Symbolizes a program counter (instruction pointer value) `pc` and, on
+// success, writes the name to `out`. The symbol name is demangled, if possible.
+// Note that the symbolized name may be truncated and will be NUL-terminated.
+// Demangling is supported for symbols generated by GCC 3.x or newer). Returns
+// `false` on failure.
+//
+// Example:
+//
+// // Print a program counter and its symbol name.
+// static void DumpPCAndSymbol(void *pc) {
+// char tmp[1024];
+// const char *symbol = "(unknown)";
+// if (absl::Symbolize(pc, tmp, sizeof(tmp))) {
+// symbol = tmp;
+// }
+// absl::PrintF("%p %s\n", pc, symbol);
+// }
+bool Symbolize(const void *pc, char *out, int out_size);
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_DEBUGGING_SYMBOLIZE_H_
diff --git a/third_party/abseil/src/absl/debugging/symbolize_darwin.inc b/third_party/abseil/src/absl/debugging/symbolize_darwin.inc
new file mode 100644
index 0000000..443ce9e
--- /dev/null
+++ b/third_party/abseil/src/absl/debugging/symbolize_darwin.inc
@@ -0,0 +1,101 @@
+// Copyright 2020 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <cxxabi.h>
+#include <execinfo.h>
+
+#include <algorithm>
+#include <cstring>
+
+#include "absl/base/internal/raw_logging.h"
+#include "absl/debugging/internal/demangle.h"
+#include "absl/strings/numbers.h"
+#include "absl/strings/str_cat.h"
+#include "absl/strings/string_view.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+void InitializeSymbolizer(const char*) {}
+
+namespace debugging_internal {
+namespace {
+
+static std::string GetSymbolString(absl::string_view backtrace_line) {
+ // Example Backtrace lines:
+ // 0 libimaging_shared.dylib 0x018c152a
+ // _ZNSt11_Deque_baseIN3nik7mediadb4PageESaIS2_EE17_M_initialize_mapEm + 3478
+ //
+ // or
+ // 0 libimaging_shared.dylib 0x0000000001895c39
+ // _ZN3nik4util19register_shared_ptrINS_3gpu7TextureEEEvPKvS5_ + 39
+ //
+ // or
+ // 0 mysterious_app 0x0124000120120009 main + 17
+ auto address_pos = backtrace_line.find(" 0x");
+ if (address_pos == absl::string_view::npos) return std::string();
+ absl::string_view symbol_view = backtrace_line.substr(address_pos + 1);
+
+ auto space_pos = symbol_view.find(" ");
+ if (space_pos == absl::string_view::npos) return std::string();
+ symbol_view = symbol_view.substr(space_pos + 1); // to mangled symbol
+
+ auto plus_pos = symbol_view.find(" + ");
+ if (plus_pos == absl::string_view::npos) return std::string();
+ symbol_view = symbol_view.substr(0, plus_pos); // strip remainng
+
+ return std::string(symbol_view);
+}
+
+} // namespace
+} // namespace debugging_internal
+
+bool Symbolize(const void* pc, char* out, int out_size) {
+ if (out_size <= 0 || pc == nullptr) {
+ out = nullptr;
+ return false;
+ }
+
+ // This allocates a char* array.
+ char** frame_strings = backtrace_symbols(const_cast<void**>(&pc), 1);
+
+ if (frame_strings == nullptr) return false;
+
+ std::string symbol = debugging_internal::GetSymbolString(frame_strings[0]);
+ free(frame_strings);
+
+ char tmp_buf[1024];
+ if (debugging_internal::Demangle(symbol.c_str(), tmp_buf, sizeof(tmp_buf))) {
+ size_t len = strlen(tmp_buf);
+ if (len + 1 <= static_cast<size_t>(out_size)) { // +1 for '\0'
+ assert(len < sizeof(tmp_buf));
+ memmove(out, tmp_buf, len + 1);
+ }
+ } else {
+ strncpy(out, symbol.c_str(), out_size);
+ }
+
+ if (out[out_size - 1] != '\0') {
+ // strncpy() does not '\0' terminate when it truncates.
+ static constexpr char kEllipsis[] = "...";
+ int ellipsis_size = std::min<int>(sizeof(kEllipsis) - 1, out_size - 1);
+ memcpy(out + out_size - ellipsis_size - 1, kEllipsis, ellipsis_size);
+ out[out_size - 1] = '\0';
+ }
+
+ return true;
+}
+
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/debugging/symbolize_elf.inc b/third_party/abseil/src/absl/debugging/symbolize_elf.inc
new file mode 100644
index 0000000..f4d5727
--- /dev/null
+++ b/third_party/abseil/src/absl/debugging/symbolize_elf.inc
@@ -0,0 +1,1560 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// This library provides Symbolize() function that symbolizes program
+// counters to their corresponding symbol names on linux platforms.
+// This library has a minimal implementation of an ELF symbol table
+// reader (i.e. it doesn't depend on libelf, etc.).
+//
+// The algorithm used in Symbolize() is as follows.
+//
+// 1. Go through a list of maps in /proc/self/maps and find the map
+// containing the program counter.
+//
+// 2. Open the mapped file and find a regular symbol table inside.
+// Iterate over symbols in the symbol table and look for the symbol
+// containing the program counter. If such a symbol is found,
+// obtain the symbol name, and demangle the symbol if possible.
+// If the symbol isn't found in the regular symbol table (binary is
+// stripped), try the same thing with a dynamic symbol table.
+//
+// Note that Symbolize() is originally implemented to be used in
+// signal handlers, hence it doesn't use malloc() and other unsafe
+// operations. It should be both thread-safe and async-signal-safe.
+//
+// Implementation note:
+//
+// We don't use heaps but only use stacks. We want to reduce the
+// stack consumption so that the symbolizer can run on small stacks.
+//
+// Here are some numbers collected with GCC 4.1.0 on x86:
+// - sizeof(Elf32_Sym) = 16
+// - sizeof(Elf32_Shdr) = 40
+// - sizeof(Elf64_Sym) = 24
+// - sizeof(Elf64_Shdr) = 64
+//
+// This implementation is intended to be async-signal-safe but uses some
+// functions which are not guaranteed to be so, such as memchr() and
+// memmove(). We assume they are async-signal-safe.
+
+#include <dlfcn.h>
+#include <elf.h>
+#include <fcntl.h>
+#include <link.h> // For ElfW() macro.
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include <algorithm>
+#include <array>
+#include <atomic>
+#include <cerrno>
+#include <cinttypes>
+#include <climits>
+#include <cstdint>
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+
+#include "absl/base/casts.h"
+#include "absl/base/dynamic_annotations.h"
+#include "absl/base/internal/low_level_alloc.h"
+#include "absl/base/internal/raw_logging.h"
+#include "absl/base/internal/spinlock.h"
+#include "absl/base/port.h"
+#include "absl/debugging/internal/demangle.h"
+#include "absl/debugging/internal/vdso_support.h"
+#include "absl/strings/string_view.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+// Value of argv[0]. Used by MaybeInitializeObjFile().
+static char *argv0_value = nullptr;
+
+void InitializeSymbolizer(const char *argv0) {
+#ifdef ABSL_HAVE_VDSO_SUPPORT
+ // We need to make sure VDSOSupport::Init() is called before any setuid or
+ // chroot calls, so InitializeSymbolizer() should be called very early in the
+ // life of a program.
+ absl::debugging_internal::VDSOSupport::Init();
+#endif
+ if (argv0_value != nullptr) {
+ free(argv0_value);
+ argv0_value = nullptr;
+ }
+ if (argv0 != nullptr && argv0[0] != '\0') {
+ argv0_value = strdup(argv0);
+ }
+}
+
+namespace debugging_internal {
+namespace {
+
+// Re-runs fn until it doesn't cause EINTR.
+#define NO_INTR(fn) \
+ do { \
+ } while ((fn) < 0 && errno == EINTR)
+
+// On Linux, ELF_ST_* are defined in <linux/elf.h>. To make this portable
+// we define our own ELF_ST_BIND and ELF_ST_TYPE if not available.
+#ifndef ELF_ST_BIND
+#define ELF_ST_BIND(info) (((unsigned char)(info)) >> 4)
+#endif
+
+#ifndef ELF_ST_TYPE
+#define ELF_ST_TYPE(info) (((unsigned char)(info)) & 0xF)
+#endif
+
+// Some platforms use a special .opd section to store function pointers.
+const char kOpdSectionName[] = ".opd";
+
+#if (defined(__powerpc__) && !(_CALL_ELF > 1)) || defined(__ia64)
+// Use opd section for function descriptors on these platforms, the function
+// address is the first word of the descriptor.
+enum { kPlatformUsesOPDSections = 1 };
+#else // not PPC or IA64
+enum { kPlatformUsesOPDSections = 0 };
+#endif
+
+// This works for PowerPC & IA64 only. A function descriptor consist of two
+// pointers and the first one is the function's entry.
+const size_t kFunctionDescriptorSize = sizeof(void *) * 2;
+
+const int kMaxDecorators = 10; // Seems like a reasonable upper limit.
+
+struct InstalledSymbolDecorator {
+ SymbolDecorator fn;
+ void *arg;
+ int ticket;
+};
+
+int g_num_decorators;
+InstalledSymbolDecorator g_decorators[kMaxDecorators];
+
+struct FileMappingHint {
+ const void *start;
+ const void *end;
+ uint64_t offset;
+ const char *filename;
+};
+
+// Protects g_decorators.
+// We are using SpinLock and not a Mutex here, because we may be called
+// from inside Mutex::Lock itself, and it prohibits recursive calls.
+// This happens in e.g. base/stacktrace_syscall_unittest.
+// Moreover, we are using only TryLock(), if the decorator list
+// is being modified (is busy), we skip all decorators, and possibly
+// loose some info. Sorry, that's the best we could do.
+ABSL_CONST_INIT absl::base_internal::SpinLock g_decorators_mu(
+ absl::kConstInit, absl::base_internal::SCHEDULE_KERNEL_ONLY);
+
+const int kMaxFileMappingHints = 8;
+int g_num_file_mapping_hints;
+FileMappingHint g_file_mapping_hints[kMaxFileMappingHints];
+// Protects g_file_mapping_hints.
+ABSL_CONST_INIT absl::base_internal::SpinLock g_file_mapping_mu(
+ absl::kConstInit, absl::base_internal::SCHEDULE_KERNEL_ONLY);
+
+// Async-signal-safe function to zero a buffer.
+// memset() is not guaranteed to be async-signal-safe.
+static void SafeMemZero(void* p, size_t size) {
+ unsigned char *c = static_cast<unsigned char *>(p);
+ while (size--) {
+ *c++ = 0;
+ }
+}
+
+struct ObjFile {
+ ObjFile()
+ : filename(nullptr),
+ start_addr(nullptr),
+ end_addr(nullptr),
+ offset(0),
+ fd(-1),
+ elf_type(-1) {
+ SafeMemZero(&elf_header, sizeof(elf_header));
+ SafeMemZero(&phdr[0], sizeof(phdr));
+ }
+
+ char *filename;
+ const void *start_addr;
+ const void *end_addr;
+ uint64_t offset;
+
+ // The following fields are initialized on the first access to the
+ // object file.
+ int fd;
+ int elf_type;
+ ElfW(Ehdr) elf_header;
+
+ // PT_LOAD program header describing executable code.
+ // Normally we expect just one, but SWIFT binaries have two.
+ std::array<ElfW(Phdr), 2> phdr;
+};
+
+// Build 4-way associative cache for symbols. Within each cache line, symbols
+// are replaced in LRU order.
+enum {
+ ASSOCIATIVITY = 4,
+};
+struct SymbolCacheLine {
+ const void *pc[ASSOCIATIVITY];
+ char *name[ASSOCIATIVITY];
+
+ // age[i] is incremented when a line is accessed. it's reset to zero if the
+ // i'th entry is read.
+ uint32_t age[ASSOCIATIVITY];
+};
+
+// ---------------------------------------------------------------
+// An async-signal-safe arena for LowLevelAlloc
+static std::atomic<base_internal::LowLevelAlloc::Arena *> g_sig_safe_arena;
+
+static base_internal::LowLevelAlloc::Arena *SigSafeArena() {
+ return g_sig_safe_arena.load(std::memory_order_acquire);
+}
+
+static void InitSigSafeArena() {
+ if (SigSafeArena() == nullptr) {
+ base_internal::LowLevelAlloc::Arena *new_arena =
+ base_internal::LowLevelAlloc::NewArena(
+ base_internal::LowLevelAlloc::kAsyncSignalSafe);
+ base_internal::LowLevelAlloc::Arena *old_value = nullptr;
+ if (!g_sig_safe_arena.compare_exchange_strong(old_value, new_arena,
+ std::memory_order_release,
+ std::memory_order_relaxed)) {
+ // We lost a race to allocate an arena; deallocate.
+ base_internal::LowLevelAlloc::DeleteArena(new_arena);
+ }
+ }
+}
+
+// ---------------------------------------------------------------
+// An AddrMap is a vector of ObjFile, using SigSafeArena() for allocation.
+
+class AddrMap {
+ public:
+ AddrMap() : size_(0), allocated_(0), obj_(nullptr) {}
+ ~AddrMap() { base_internal::LowLevelAlloc::Free(obj_); }
+ int Size() const { return size_; }
+ ObjFile *At(int i) { return &obj_[i]; }
+ ObjFile *Add();
+ void Clear();
+
+ private:
+ int size_; // count of valid elements (<= allocated_)
+ int allocated_; // count of allocated elements
+ ObjFile *obj_; // array of allocated_ elements
+ AddrMap(const AddrMap &) = delete;
+ AddrMap &operator=(const AddrMap &) = delete;
+};
+
+void AddrMap::Clear() {
+ for (int i = 0; i != size_; i++) {
+ At(i)->~ObjFile();
+ }
+ size_ = 0;
+}
+
+ObjFile *AddrMap::Add() {
+ if (size_ == allocated_) {
+ int new_allocated = allocated_ * 2 + 50;
+ ObjFile *new_obj_ =
+ static_cast<ObjFile *>(base_internal::LowLevelAlloc::AllocWithArena(
+ new_allocated * sizeof(*new_obj_), SigSafeArena()));
+ if (obj_) {
+ memcpy(new_obj_, obj_, allocated_ * sizeof(*new_obj_));
+ base_internal::LowLevelAlloc::Free(obj_);
+ }
+ obj_ = new_obj_;
+ allocated_ = new_allocated;
+ }
+ return new (&obj_[size_++]) ObjFile;
+}
+
+// ---------------------------------------------------------------
+
+enum FindSymbolResult { SYMBOL_NOT_FOUND = 1, SYMBOL_TRUNCATED, SYMBOL_FOUND };
+
+class Symbolizer {
+ public:
+ Symbolizer();
+ ~Symbolizer();
+ const char *GetSymbol(const void *const pc);
+
+ private:
+ char *CopyString(const char *s) {
+ int len = strlen(s);
+ char *dst = static_cast<char *>(
+ base_internal::LowLevelAlloc::AllocWithArena(len + 1, SigSafeArena()));
+ ABSL_RAW_CHECK(dst != nullptr, "out of memory");
+ memcpy(dst, s, len + 1);
+ return dst;
+ }
+ ObjFile *FindObjFile(const void *const start,
+ size_t size) ABSL_ATTRIBUTE_NOINLINE;
+ static bool RegisterObjFile(const char *filename,
+ const void *const start_addr,
+ const void *const end_addr, uint64_t offset,
+ void *arg);
+ SymbolCacheLine *GetCacheLine(const void *const pc);
+ const char *FindSymbolInCache(const void *const pc);
+ const char *InsertSymbolInCache(const void *const pc, const char *name);
+ void AgeSymbols(SymbolCacheLine *line);
+ void ClearAddrMap();
+ FindSymbolResult GetSymbolFromObjectFile(const ObjFile &obj,
+ const void *const pc,
+ const ptrdiff_t relocation,
+ char *out, int out_size,
+ char *tmp_buf, int tmp_buf_size);
+
+ enum {
+ SYMBOL_BUF_SIZE = 3072,
+ TMP_BUF_SIZE = 1024,
+ SYMBOL_CACHE_LINES = 128,
+ };
+
+ AddrMap addr_map_;
+
+ bool ok_;
+ bool addr_map_read_;
+
+ char symbol_buf_[SYMBOL_BUF_SIZE];
+
+ // tmp_buf_ will be used to store arrays of ElfW(Shdr) and ElfW(Sym)
+ // so we ensure that tmp_buf_ is properly aligned to store either.
+ alignas(16) char tmp_buf_[TMP_BUF_SIZE];
+ static_assert(alignof(ElfW(Shdr)) <= 16,
+ "alignment of tmp buf too small for Shdr");
+ static_assert(alignof(ElfW(Sym)) <= 16,
+ "alignment of tmp buf too small for Sym");
+
+ SymbolCacheLine symbol_cache_[SYMBOL_CACHE_LINES];
+};
+
+static std::atomic<Symbolizer *> g_cached_symbolizer;
+
+} // namespace
+
+static int SymbolizerSize() {
+#if defined(__wasm__) || defined(__asmjs__)
+ int pagesize = getpagesize();
+#else
+ int pagesize = sysconf(_SC_PAGESIZE);
+#endif
+ return ((sizeof(Symbolizer) - 1) / pagesize + 1) * pagesize;
+}
+
+// Return (and set null) g_cached_symbolized_state if it is not null.
+// Otherwise return a new symbolizer.
+static Symbolizer *AllocateSymbolizer() {
+ InitSigSafeArena();
+ Symbolizer *symbolizer =
+ g_cached_symbolizer.exchange(nullptr, std::memory_order_acquire);
+ if (symbolizer != nullptr) {
+ return symbolizer;
+ }
+ return new (base_internal::LowLevelAlloc::AllocWithArena(
+ SymbolizerSize(), SigSafeArena())) Symbolizer();
+}
+
+// Set g_cached_symbolize_state to s if it is null, otherwise
+// delete s.
+static void FreeSymbolizer(Symbolizer *s) {
+ Symbolizer *old_cached_symbolizer = nullptr;
+ if (!g_cached_symbolizer.compare_exchange_strong(old_cached_symbolizer, s,
+ std::memory_order_release,
+ std::memory_order_relaxed)) {
+ s->~Symbolizer();
+ base_internal::LowLevelAlloc::Free(s);
+ }
+}
+
+Symbolizer::Symbolizer() : ok_(true), addr_map_read_(false) {
+ for (SymbolCacheLine &symbol_cache_line : symbol_cache_) {
+ for (size_t j = 0; j < ABSL_ARRAYSIZE(symbol_cache_line.name); ++j) {
+ symbol_cache_line.pc[j] = nullptr;
+ symbol_cache_line.name[j] = nullptr;
+ symbol_cache_line.age[j] = 0;
+ }
+ }
+}
+
+Symbolizer::~Symbolizer() {
+ for (SymbolCacheLine &symbol_cache_line : symbol_cache_) {
+ for (char *s : symbol_cache_line.name) {
+ base_internal::LowLevelAlloc::Free(s);
+ }
+ }
+ ClearAddrMap();
+}
+
+// We don't use assert() since it's not guaranteed to be
+// async-signal-safe. Instead we define a minimal assertion
+// macro. So far, we don't need pretty printing for __FILE__, etc.
+#define SAFE_ASSERT(expr) ((expr) ? static_cast<void>(0) : abort())
+
+// Read up to "count" bytes from file descriptor "fd" into the buffer
+// starting at "buf" while handling short reads and EINTR. On
+// success, return the number of bytes read. Otherwise, return -1.
+static ssize_t ReadPersistent(int fd, void *buf, size_t count) {
+ SAFE_ASSERT(fd >= 0);
+ SAFE_ASSERT(count <= SSIZE_MAX);
+ char *buf0 = reinterpret_cast<char *>(buf);
+ size_t num_bytes = 0;
+ while (num_bytes < count) {
+ ssize_t len;
+ NO_INTR(len = read(fd, buf0 + num_bytes, count - num_bytes));
+ if (len < 0) { // There was an error other than EINTR.
+ ABSL_RAW_LOG(WARNING, "read failed: errno=%d", errno);
+ return -1;
+ }
+ if (len == 0) { // Reached EOF.
+ break;
+ }
+ num_bytes += len;
+ }
+ SAFE_ASSERT(num_bytes <= count);
+ return static_cast<ssize_t>(num_bytes);
+}
+
+// Read up to "count" bytes from "offset" in the file pointed by file
+// descriptor "fd" into the buffer starting at "buf". On success,
+// return the number of bytes read. Otherwise, return -1.
+static ssize_t ReadFromOffset(const int fd, void *buf, const size_t count,
+ const off_t offset) {
+ off_t off = lseek(fd, offset, SEEK_SET);
+ if (off == (off_t)-1) {
+ ABSL_RAW_LOG(WARNING, "lseek(%d, %ju, SEEK_SET) failed: errno=%d", fd,
+ static_cast<uintmax_t>(offset), errno);
+ return -1;
+ }
+ return ReadPersistent(fd, buf, count);
+}
+
+// Try reading exactly "count" bytes from "offset" bytes in a file
+// pointed by "fd" into the buffer starting at "buf" while handling
+// short reads and EINTR. On success, return true. Otherwise, return
+// false.
+static bool ReadFromOffsetExact(const int fd, void *buf, const size_t count,
+ const off_t offset) {
+ ssize_t len = ReadFromOffset(fd, buf, count, offset);
+ return len >= 0 && static_cast<size_t>(len) == count;
+}
+
+// Returns elf_header.e_type if the file pointed by fd is an ELF binary.
+static int FileGetElfType(const int fd) {
+ ElfW(Ehdr) elf_header;
+ if (!ReadFromOffsetExact(fd, &elf_header, sizeof(elf_header), 0)) {
+ return -1;
+ }
+ if (memcmp(elf_header.e_ident, ELFMAG, SELFMAG) != 0) {
+ return -1;
+ }
+ return elf_header.e_type;
+}
+
+// Read the section headers in the given ELF binary, and if a section
+// of the specified type is found, set the output to this section header
+// and return true. Otherwise, return false.
+// To keep stack consumption low, we would like this function to not get
+// inlined.
+static ABSL_ATTRIBUTE_NOINLINE bool GetSectionHeaderByType(
+ const int fd, ElfW(Half) sh_num, const off_t sh_offset, ElfW(Word) type,
+ ElfW(Shdr) * out, char *tmp_buf, int tmp_buf_size) {
+ ElfW(Shdr) *buf = reinterpret_cast<ElfW(Shdr) *>(tmp_buf);
+ const int buf_entries = tmp_buf_size / sizeof(buf[0]);
+ const int buf_bytes = buf_entries * sizeof(buf[0]);
+
+ for (int i = 0; i < sh_num;) {
+ const ssize_t num_bytes_left = (sh_num - i) * sizeof(buf[0]);
+ const ssize_t num_bytes_to_read =
+ (buf_bytes > num_bytes_left) ? num_bytes_left : buf_bytes;
+ const off_t offset = sh_offset + i * sizeof(buf[0]);
+ const ssize_t len = ReadFromOffset(fd, buf, num_bytes_to_read, offset);
+ if (len % sizeof(buf[0]) != 0) {
+ ABSL_RAW_LOG(
+ WARNING,
+ "Reading %zd bytes from offset %ju returned %zd which is not a "
+ "multiple of %zu.",
+ num_bytes_to_read, static_cast<uintmax_t>(offset), len,
+ sizeof(buf[0]));
+ return false;
+ }
+ const ssize_t num_headers_in_buf = len / sizeof(buf[0]);
+ SAFE_ASSERT(num_headers_in_buf <= buf_entries);
+ for (int j = 0; j < num_headers_in_buf; ++j) {
+ if (buf[j].sh_type == type) {
+ *out = buf[j];
+ return true;
+ }
+ }
+ i += num_headers_in_buf;
+ }
+ return false;
+}
+
+// There is no particular reason to limit section name to 63 characters,
+// but there has (as yet) been no need for anything longer either.
+const int kMaxSectionNameLen = 64;
+
+bool ForEachSection(int fd,
+ const std::function<bool(absl::string_view name,
+ const ElfW(Shdr) &)> &callback) {
+ ElfW(Ehdr) elf_header;
+ if (!ReadFromOffsetExact(fd, &elf_header, sizeof(elf_header), 0)) {
+ return false;
+ }
+
+ ElfW(Shdr) shstrtab;
+ off_t shstrtab_offset =
+ (elf_header.e_shoff + elf_header.e_shentsize * elf_header.e_shstrndx);
+ if (!ReadFromOffsetExact(fd, &shstrtab, sizeof(shstrtab), shstrtab_offset)) {
+ return false;
+ }
+
+ for (int i = 0; i < elf_header.e_shnum; ++i) {
+ ElfW(Shdr) out;
+ off_t section_header_offset =
+ (elf_header.e_shoff + elf_header.e_shentsize * i);
+ if (!ReadFromOffsetExact(fd, &out, sizeof(out), section_header_offset)) {
+ return false;
+ }
+ off_t name_offset = shstrtab.sh_offset + out.sh_name;
+ char header_name[kMaxSectionNameLen];
+ ssize_t n_read =
+ ReadFromOffset(fd, &header_name, kMaxSectionNameLen, name_offset);
+ if (n_read == -1) {
+ return false;
+ } else if (n_read > kMaxSectionNameLen) {
+ // Long read?
+ return false;
+ }
+
+ absl::string_view name(header_name, strnlen(header_name, n_read));
+ if (!callback(name, out)) {
+ break;
+ }
+ }
+ return true;
+}
+
+// name_len should include terminating '\0'.
+bool GetSectionHeaderByName(int fd, const char *name, size_t name_len,
+ ElfW(Shdr) * out) {
+ char header_name[kMaxSectionNameLen];
+ if (sizeof(header_name) < name_len) {
+ ABSL_RAW_LOG(WARNING,
+ "Section name '%s' is too long (%zu); "
+ "section will not be found (even if present).",
+ name, name_len);
+ // No point in even trying.
+ return false;
+ }
+
+ ElfW(Ehdr) elf_header;
+ if (!ReadFromOffsetExact(fd, &elf_header, sizeof(elf_header), 0)) {
+ return false;
+ }
+
+ ElfW(Shdr) shstrtab;
+ off_t shstrtab_offset =
+ (elf_header.e_shoff + elf_header.e_shentsize * elf_header.e_shstrndx);
+ if (!ReadFromOffsetExact(fd, &shstrtab, sizeof(shstrtab), shstrtab_offset)) {
+ return false;
+ }
+
+ for (int i = 0; i < elf_header.e_shnum; ++i) {
+ off_t section_header_offset =
+ (elf_header.e_shoff + elf_header.e_shentsize * i);
+ if (!ReadFromOffsetExact(fd, out, sizeof(*out), section_header_offset)) {
+ return false;
+ }
+ off_t name_offset = shstrtab.sh_offset + out->sh_name;
+ ssize_t n_read = ReadFromOffset(fd, &header_name, name_len, name_offset);
+ if (n_read < 0) {
+ return false;
+ } else if (static_cast<size_t>(n_read) != name_len) {
+ // Short read -- name could be at end of file.
+ continue;
+ }
+ if (memcmp(header_name, name, name_len) == 0) {
+ return true;
+ }
+ }
+ return false;
+}
+
+// Compare symbols at in the same address.
+// Return true if we should pick symbol1.
+static bool ShouldPickFirstSymbol(const ElfW(Sym) & symbol1,
+ const ElfW(Sym) & symbol2) {
+ // If one of the symbols is weak and the other is not, pick the one
+ // this is not a weak symbol.
+ char bind1 = ELF_ST_BIND(symbol1.st_info);
+ char bind2 = ELF_ST_BIND(symbol1.st_info);
+ if (bind1 == STB_WEAK && bind2 != STB_WEAK) return false;
+ if (bind2 == STB_WEAK && bind1 != STB_WEAK) return true;
+
+ // If one of the symbols has zero size and the other is not, pick the
+ // one that has non-zero size.
+ if (symbol1.st_size != 0 && symbol2.st_size == 0) {
+ return true;
+ }
+ if (symbol1.st_size == 0 && symbol2.st_size != 0) {
+ return false;
+ }
+
+ // If one of the symbols has no type and the other is not, pick the
+ // one that has a type.
+ char type1 = ELF_ST_TYPE(symbol1.st_info);
+ char type2 = ELF_ST_TYPE(symbol1.st_info);
+ if (type1 != STT_NOTYPE && type2 == STT_NOTYPE) {
+ return true;
+ }
+ if (type1 == STT_NOTYPE && type2 != STT_NOTYPE) {
+ return false;
+ }
+
+ // Pick the first one, if we still cannot decide.
+ return true;
+}
+
+// Return true if an address is inside a section.
+static bool InSection(const void *address, const ElfW(Shdr) * section) {
+ const char *start = reinterpret_cast<const char *>(section->sh_addr);
+ size_t size = static_cast<size_t>(section->sh_size);
+ return start <= address && address < (start + size);
+}
+
+static const char *ComputeOffset(const char *base, ptrdiff_t offset) {
+ // Note: cast to uintptr_t to avoid undefined behavior when base evaluates to
+ // zero and offset is non-zero.
+ return reinterpret_cast<const char *>(
+ reinterpret_cast<uintptr_t>(base) + offset);
+}
+
+// Read a symbol table and look for the symbol containing the
+// pc. Iterate over symbols in a symbol table and look for the symbol
+// containing "pc". If the symbol is found, and its name fits in
+// out_size, the name is written into out and SYMBOL_FOUND is returned.
+// If the name does not fit, truncated name is written into out,
+// and SYMBOL_TRUNCATED is returned. Out is NUL-terminated.
+// If the symbol is not found, SYMBOL_NOT_FOUND is returned;
+// To keep stack consumption low, we would like this function to not get
+// inlined.
+static ABSL_ATTRIBUTE_NOINLINE FindSymbolResult FindSymbol(
+ const void *const pc, const int fd, char *out, int out_size,
+ ptrdiff_t relocation, const ElfW(Shdr) * strtab, const ElfW(Shdr) * symtab,
+ const ElfW(Shdr) * opd, char *tmp_buf, int tmp_buf_size) {
+ if (symtab == nullptr) {
+ return SYMBOL_NOT_FOUND;
+ }
+
+ // Read multiple symbols at once to save read() calls.
+ ElfW(Sym) *buf = reinterpret_cast<ElfW(Sym) *>(tmp_buf);
+ const int buf_entries = tmp_buf_size / sizeof(buf[0]);
+
+ const int num_symbols = symtab->sh_size / symtab->sh_entsize;
+
+ // On platforms using an .opd section (PowerPC & IA64), a function symbol
+ // has the address of a function descriptor, which contains the real
+ // starting address. However, we do not always want to use the real
+ // starting address because we sometimes want to symbolize a function
+ // pointer into the .opd section, e.g. FindSymbol(&foo,...).
+ const bool pc_in_opd =
+ kPlatformUsesOPDSections && opd != nullptr && InSection(pc, opd);
+ const bool deref_function_descriptor_pointer =
+ kPlatformUsesOPDSections && opd != nullptr && !pc_in_opd;
+
+ ElfW(Sym) best_match;
+ SafeMemZero(&best_match, sizeof(best_match));
+ bool found_match = false;
+ for (int i = 0; i < num_symbols;) {
+ off_t offset = symtab->sh_offset + i * symtab->sh_entsize;
+ const int num_remaining_symbols = num_symbols - i;
+ const int entries_in_chunk = std::min(num_remaining_symbols, buf_entries);
+ const int bytes_in_chunk = entries_in_chunk * sizeof(buf[0]);
+ const ssize_t len = ReadFromOffset(fd, buf, bytes_in_chunk, offset);
+ SAFE_ASSERT(len % sizeof(buf[0]) == 0);
+ const ssize_t num_symbols_in_buf = len / sizeof(buf[0]);
+ SAFE_ASSERT(num_symbols_in_buf <= entries_in_chunk);
+ for (int j = 0; j < num_symbols_in_buf; ++j) {
+ const ElfW(Sym) &symbol = buf[j];
+
+ // For a DSO, a symbol address is relocated by the loading address.
+ // We keep the original address for opd redirection below.
+ const char *const original_start_address =
+ reinterpret_cast<const char *>(symbol.st_value);
+ const char *start_address =
+ ComputeOffset(original_start_address, relocation);
+
+ if (deref_function_descriptor_pointer &&
+ InSection(original_start_address, opd)) {
+ // The opd section is mapped into memory. Just dereference
+ // start_address to get the first double word, which points to the
+ // function entry.
+ start_address = *reinterpret_cast<const char *const *>(start_address);
+ }
+
+ // If pc is inside the .opd section, it points to a function descriptor.
+ const size_t size = pc_in_opd ? kFunctionDescriptorSize : symbol.st_size;
+ const void *const end_address = ComputeOffset(start_address, size);
+ if (symbol.st_value != 0 && // Skip null value symbols.
+ symbol.st_shndx != 0 && // Skip undefined symbols.
+#ifdef STT_TLS
+ ELF_ST_TYPE(symbol.st_info) != STT_TLS && // Skip thread-local data.
+#endif // STT_TLS
+ ((start_address <= pc && pc < end_address) ||
+ (start_address == pc && pc == end_address))) {
+ if (!found_match || ShouldPickFirstSymbol(symbol, best_match)) {
+ found_match = true;
+ best_match = symbol;
+ }
+ }
+ }
+ i += num_symbols_in_buf;
+ }
+
+ if (found_match) {
+ const size_t off = strtab->sh_offset + best_match.st_name;
+ const ssize_t n_read = ReadFromOffset(fd, out, out_size, off);
+ if (n_read <= 0) {
+ // This should never happen.
+ ABSL_RAW_LOG(WARNING,
+ "Unable to read from fd %d at offset %zu: n_read = %zd", fd,
+ off, n_read);
+ return SYMBOL_NOT_FOUND;
+ }
+ ABSL_RAW_CHECK(n_read <= out_size, "ReadFromOffset read too much data.");
+
+ // strtab->sh_offset points into .strtab-like section that contains
+ // NUL-terminated strings: '\0foo\0barbaz\0...".
+ //
+ // sh_offset+st_name points to the start of symbol name, but we don't know
+ // how long the symbol is, so we try to read as much as we have space for,
+ // and usually over-read (i.e. there is a NUL somewhere before n_read).
+ if (memchr(out, '\0', n_read) == nullptr) {
+ // Either out_size was too small (n_read == out_size and no NUL), or
+ // we tried to read past the EOF (n_read < out_size) and .strtab is
+ // corrupt (missing terminating NUL; should never happen for valid ELF).
+ out[n_read - 1] = '\0';
+ return SYMBOL_TRUNCATED;
+ }
+ return SYMBOL_FOUND;
+ }
+
+ return SYMBOL_NOT_FOUND;
+}
+
+// Get the symbol name of "pc" from the file pointed by "fd". Process
+// both regular and dynamic symbol tables if necessary.
+// See FindSymbol() comment for description of return value.
+FindSymbolResult Symbolizer::GetSymbolFromObjectFile(
+ const ObjFile &obj, const void *const pc, const ptrdiff_t relocation,
+ char *out, int out_size, char *tmp_buf, int tmp_buf_size) {
+ ElfW(Shdr) symtab;
+ ElfW(Shdr) strtab;
+ ElfW(Shdr) opd;
+ ElfW(Shdr) *opd_ptr = nullptr;
+
+ // On platforms using an .opd sections for function descriptor, read
+ // the section header. The .opd section is in data segment and should be
+ // loaded but we check that it is mapped just to be extra careful.
+ if (kPlatformUsesOPDSections) {
+ if (GetSectionHeaderByName(obj.fd, kOpdSectionName,
+ sizeof(kOpdSectionName) - 1, &opd) &&
+ FindObjFile(reinterpret_cast<const char *>(opd.sh_addr) + relocation,
+ opd.sh_size) != nullptr) {
+ opd_ptr = &opd;
+ } else {
+ return SYMBOL_NOT_FOUND;
+ }
+ }
+
+ // Consult a regular symbol table, then fall back to the dynamic symbol table.
+ for (const auto symbol_table_type : {SHT_SYMTAB, SHT_DYNSYM}) {
+ if (!GetSectionHeaderByType(obj.fd, obj.elf_header.e_shnum,
+ obj.elf_header.e_shoff, symbol_table_type,
+ &symtab, tmp_buf, tmp_buf_size)) {
+ continue;
+ }
+ if (!ReadFromOffsetExact(
+ obj.fd, &strtab, sizeof(strtab),
+ obj.elf_header.e_shoff + symtab.sh_link * sizeof(symtab))) {
+ continue;
+ }
+ const FindSymbolResult rc =
+ FindSymbol(pc, obj.fd, out, out_size, relocation, &strtab, &symtab,
+ opd_ptr, tmp_buf, tmp_buf_size);
+ if (rc != SYMBOL_NOT_FOUND) {
+ return rc;
+ }
+ }
+
+ return SYMBOL_NOT_FOUND;
+}
+
+namespace {
+// Thin wrapper around a file descriptor so that the file descriptor
+// gets closed for sure.
+class FileDescriptor {
+ public:
+ explicit FileDescriptor(int fd) : fd_(fd) {}
+ FileDescriptor(const FileDescriptor &) = delete;
+ FileDescriptor &operator=(const FileDescriptor &) = delete;
+
+ ~FileDescriptor() {
+ if (fd_ >= 0) {
+ NO_INTR(close(fd_));
+ }
+ }
+
+ int get() const { return fd_; }
+
+ private:
+ const int fd_;
+};
+
+// Helper class for reading lines from file.
+//
+// Note: we don't use ProcMapsIterator since the object is big (it has
+// a 5k array member) and uses async-unsafe functions such as sscanf()
+// and snprintf().
+class LineReader {
+ public:
+ explicit LineReader(int fd, char *buf, int buf_len)
+ : fd_(fd),
+ buf_len_(buf_len),
+ buf_(buf),
+ bol_(buf),
+ eol_(buf),
+ eod_(buf) {}
+
+ LineReader(const LineReader &) = delete;
+ LineReader &operator=(const LineReader &) = delete;
+
+ // Read '\n'-terminated line from file. On success, modify "bol"
+ // and "eol", then return true. Otherwise, return false.
+ //
+ // Note: if the last line doesn't end with '\n', the line will be
+ // dropped. It's an intentional behavior to make the code simple.
+ bool ReadLine(const char **bol, const char **eol) {
+ if (BufferIsEmpty()) { // First time.
+ const ssize_t num_bytes = ReadPersistent(fd_, buf_, buf_len_);
+ if (num_bytes <= 0) { // EOF or error.
+ return false;
+ }
+ eod_ = buf_ + num_bytes;
+ bol_ = buf_;
+ } else {
+ bol_ = eol_ + 1; // Advance to the next line in the buffer.
+ SAFE_ASSERT(bol_ <= eod_); // "bol_" can point to "eod_".
+ if (!HasCompleteLine()) {
+ const int incomplete_line_length = eod_ - bol_;
+ // Move the trailing incomplete line to the beginning.
+ memmove(buf_, bol_, incomplete_line_length);
+ // Read text from file and append it.
+ char *const append_pos = buf_ + incomplete_line_length;
+ const int capacity_left = buf_len_ - incomplete_line_length;
+ const ssize_t num_bytes =
+ ReadPersistent(fd_, append_pos, capacity_left);
+ if (num_bytes <= 0) { // EOF or error.
+ return false;
+ }
+ eod_ = append_pos + num_bytes;
+ bol_ = buf_;
+ }
+ }
+ eol_ = FindLineFeed();
+ if (eol_ == nullptr) { // '\n' not found. Malformed line.
+ return false;
+ }
+ *eol_ = '\0'; // Replace '\n' with '\0'.
+
+ *bol = bol_;
+ *eol = eol_;
+ return true;
+ }
+
+ private:
+ char *FindLineFeed() const {
+ return reinterpret_cast<char *>(memchr(bol_, '\n', eod_ - bol_));
+ }
+
+ bool BufferIsEmpty() const { return buf_ == eod_; }
+
+ bool HasCompleteLine() const {
+ return !BufferIsEmpty() && FindLineFeed() != nullptr;
+ }
+
+ const int fd_;
+ const int buf_len_;
+ char *const buf_;
+ char *bol_;
+ char *eol_;
+ const char *eod_; // End of data in "buf_".
+};
+} // namespace
+
+// Place the hex number read from "start" into "*hex". The pointer to
+// the first non-hex character or "end" is returned.
+static const char *GetHex(const char *start, const char *end,
+ uint64_t *const value) {
+ uint64_t hex = 0;
+ const char *p;
+ for (p = start; p < end; ++p) {
+ int ch = *p;
+ if ((ch >= '0' && ch <= '9') || (ch >= 'A' && ch <= 'F') ||
+ (ch >= 'a' && ch <= 'f')) {
+ hex = (hex << 4) | (ch < 'A' ? ch - '0' : (ch & 0xF) + 9);
+ } else { // Encountered the first non-hex character.
+ break;
+ }
+ }
+ SAFE_ASSERT(p <= end);
+ *value = hex;
+ return p;
+}
+
+static const char *GetHex(const char *start, const char *end,
+ const void **const addr) {
+ uint64_t hex = 0;
+ const char *p = GetHex(start, end, &hex);
+ *addr = reinterpret_cast<void *>(hex);
+ return p;
+}
+
+// Normally we are only interested in "r?x" maps.
+// On the PowerPC, function pointers point to descriptors in the .opd
+// section. The descriptors themselves are not executable code, so
+// we need to relax the check below to "r??".
+static bool ShouldUseMapping(const char *const flags) {
+ return flags[0] == 'r' && (kPlatformUsesOPDSections || flags[2] == 'x');
+}
+
+// Read /proc/self/maps and run "callback" for each mmapped file found. If
+// "callback" returns false, stop scanning and return true. Else continue
+// scanning /proc/self/maps. Return true if no parse error is found.
+static ABSL_ATTRIBUTE_NOINLINE bool ReadAddrMap(
+ bool (*callback)(const char *filename, const void *const start_addr,
+ const void *const end_addr, uint64_t offset, void *arg),
+ void *arg, void *tmp_buf, int tmp_buf_size) {
+ // Use /proc/self/task/<pid>/maps instead of /proc/self/maps. The latter
+ // requires kernel to stop all threads, and is significantly slower when there
+ // are 1000s of threads.
+ char maps_path[80];
+ snprintf(maps_path, sizeof(maps_path), "/proc/self/task/%d/maps", getpid());
+
+ int maps_fd;
+ NO_INTR(maps_fd = open(maps_path, O_RDONLY));
+ FileDescriptor wrapped_maps_fd(maps_fd);
+ if (wrapped_maps_fd.get() < 0) {
+ ABSL_RAW_LOG(WARNING, "%s: errno=%d", maps_path, errno);
+ return false;
+ }
+
+ // Iterate over maps and look for the map containing the pc. Then
+ // look into the symbol tables inside.
+ LineReader reader(wrapped_maps_fd.get(), static_cast<char *>(tmp_buf),
+ tmp_buf_size);
+ while (true) {
+ const char *cursor;
+ const char *eol;
+ if (!reader.ReadLine(&cursor, &eol)) { // EOF or malformed line.
+ break;
+ }
+
+ const char *line = cursor;
+ const void *start_address;
+ // Start parsing line in /proc/self/maps. Here is an example:
+ //
+ // 08048000-0804c000 r-xp 00000000 08:01 2142121 /bin/cat
+ //
+ // We want start address (08048000), end address (0804c000), flags
+ // (r-xp) and file name (/bin/cat).
+
+ // Read start address.
+ cursor = GetHex(cursor, eol, &start_address);
+ if (cursor == eol || *cursor != '-') {
+ ABSL_RAW_LOG(WARNING, "Corrupt /proc/self/maps line: %s", line);
+ return false;
+ }
+ ++cursor; // Skip '-'.
+
+ // Read end address.
+ const void *end_address;
+ cursor = GetHex(cursor, eol, &end_address);
+ if (cursor == eol || *cursor != ' ') {
+ ABSL_RAW_LOG(WARNING, "Corrupt /proc/self/maps line: %s", line);
+ return false;
+ }
+ ++cursor; // Skip ' '.
+
+ // Read flags. Skip flags until we encounter a space or eol.
+ const char *const flags_start = cursor;
+ while (cursor < eol && *cursor != ' ') {
+ ++cursor;
+ }
+ // We expect at least four letters for flags (ex. "r-xp").
+ if (cursor == eol || cursor < flags_start + 4) {
+ ABSL_RAW_LOG(WARNING, "Corrupt /proc/self/maps: %s", line);
+ return false;
+ }
+
+ // Check flags.
+ if (!ShouldUseMapping(flags_start)) {
+ continue; // We skip this map.
+ }
+ ++cursor; // Skip ' '.
+
+ // Read file offset.
+ uint64_t offset;
+ cursor = GetHex(cursor, eol, &offset);
+ ++cursor; // Skip ' '.
+
+ // Skip to file name. "cursor" now points to dev. We need to skip at least
+ // two spaces for dev and inode.
+ int num_spaces = 0;
+ while (cursor < eol) {
+ if (*cursor == ' ') {
+ ++num_spaces;
+ } else if (num_spaces >= 2) {
+ // The first non-space character after skipping two spaces
+ // is the beginning of the file name.
+ break;
+ }
+ ++cursor;
+ }
+
+ // Check whether this entry corresponds to our hint table for the true
+ // filename.
+ bool hinted =
+ GetFileMappingHint(&start_address, &end_address, &offset, &cursor);
+ if (!hinted && (cursor == eol || cursor[0] == '[')) {
+ // not an object file, typically [vdso] or [vsyscall]
+ continue;
+ }
+ if (!callback(cursor, start_address, end_address, offset, arg)) break;
+ }
+ return true;
+}
+
+// Find the objfile mapped in address region containing [addr, addr + len).
+ObjFile *Symbolizer::FindObjFile(const void *const addr, size_t len) {
+ for (int i = 0; i < 2; ++i) {
+ if (!ok_) return nullptr;
+
+ // Read /proc/self/maps if necessary
+ if (!addr_map_read_) {
+ addr_map_read_ = true;
+ if (!ReadAddrMap(RegisterObjFile, this, tmp_buf_, TMP_BUF_SIZE)) {
+ ok_ = false;
+ return nullptr;
+ }
+ }
+
+ int lo = 0;
+ int hi = addr_map_.Size();
+ while (lo < hi) {
+ int mid = (lo + hi) / 2;
+ if (addr < addr_map_.At(mid)->end_addr) {
+ hi = mid;
+ } else {
+ lo = mid + 1;
+ }
+ }
+ if (lo != addr_map_.Size()) {
+ ObjFile *obj = addr_map_.At(lo);
+ SAFE_ASSERT(obj->end_addr > addr);
+ if (addr >= obj->start_addr &&
+ reinterpret_cast<const char *>(addr) + len <= obj->end_addr)
+ return obj;
+ }
+
+ // The address mapping may have changed since it was last read. Retry.
+ ClearAddrMap();
+ }
+ return nullptr;
+}
+
+void Symbolizer::ClearAddrMap() {
+ for (int i = 0; i != addr_map_.Size(); i++) {
+ ObjFile *o = addr_map_.At(i);
+ base_internal::LowLevelAlloc::Free(o->filename);
+ if (o->fd >= 0) {
+ NO_INTR(close(o->fd));
+ }
+ }
+ addr_map_.Clear();
+ addr_map_read_ = false;
+}
+
+// Callback for ReadAddrMap to register objfiles in an in-memory table.
+bool Symbolizer::RegisterObjFile(const char *filename,
+ const void *const start_addr,
+ const void *const end_addr, uint64_t offset,
+ void *arg) {
+ Symbolizer *impl = static_cast<Symbolizer *>(arg);
+
+ // Files are supposed to be added in the increasing address order. Make
+ // sure that's the case.
+ int addr_map_size = impl->addr_map_.Size();
+ if (addr_map_size != 0) {
+ ObjFile *old = impl->addr_map_.At(addr_map_size - 1);
+ if (old->end_addr > end_addr) {
+ ABSL_RAW_LOG(ERROR,
+ "Unsorted addr map entry: 0x%" PRIxPTR ": %s <-> 0x%" PRIxPTR
+ ": %s",
+ reinterpret_cast<uintptr_t>(end_addr), filename,
+ reinterpret_cast<uintptr_t>(old->end_addr), old->filename);
+ return true;
+ } else if (old->end_addr == end_addr) {
+ // The same entry appears twice. This sometimes happens for [vdso].
+ if (old->start_addr != start_addr ||
+ strcmp(old->filename, filename) != 0) {
+ ABSL_RAW_LOG(ERROR,
+ "Duplicate addr 0x%" PRIxPTR ": %s <-> 0x%" PRIxPTR ": %s",
+ reinterpret_cast<uintptr_t>(end_addr), filename,
+ reinterpret_cast<uintptr_t>(old->end_addr), old->filename);
+ }
+ return true;
+ }
+ }
+ ObjFile *obj = impl->addr_map_.Add();
+ obj->filename = impl->CopyString(filename);
+ obj->start_addr = start_addr;
+ obj->end_addr = end_addr;
+ obj->offset = offset;
+ obj->elf_type = -1; // filled on demand
+ obj->fd = -1; // opened on demand
+ return true;
+}
+
+// This function wraps the Demangle function to provide an interface
+// where the input symbol is demangled in-place.
+// To keep stack consumption low, we would like this function to not
+// get inlined.
+static ABSL_ATTRIBUTE_NOINLINE void DemangleInplace(char *out, int out_size,
+ char *tmp_buf,
+ int tmp_buf_size) {
+ if (Demangle(out, tmp_buf, tmp_buf_size)) {
+ // Demangling succeeded. Copy to out if the space allows.
+ int len = strlen(tmp_buf);
+ if (len + 1 <= out_size) { // +1 for '\0'.
+ SAFE_ASSERT(len < tmp_buf_size);
+ memmove(out, tmp_buf, len + 1);
+ }
+ }
+}
+
+SymbolCacheLine *Symbolizer::GetCacheLine(const void *const pc) {
+ uintptr_t pc0 = reinterpret_cast<uintptr_t>(pc);
+ pc0 >>= 3; // drop the low 3 bits
+
+ // Shuffle bits.
+ pc0 ^= (pc0 >> 6) ^ (pc0 >> 12) ^ (pc0 >> 18);
+ return &symbol_cache_[pc0 % SYMBOL_CACHE_LINES];
+}
+
+void Symbolizer::AgeSymbols(SymbolCacheLine *line) {
+ for (uint32_t &age : line->age) {
+ ++age;
+ }
+}
+
+const char *Symbolizer::FindSymbolInCache(const void *const pc) {
+ if (pc == nullptr) return nullptr;
+
+ SymbolCacheLine *line = GetCacheLine(pc);
+ for (size_t i = 0; i < ABSL_ARRAYSIZE(line->pc); ++i) {
+ if (line->pc[i] == pc) {
+ AgeSymbols(line);
+ line->age[i] = 0;
+ return line->name[i];
+ }
+ }
+ return nullptr;
+}
+
+const char *Symbolizer::InsertSymbolInCache(const void *const pc,
+ const char *name) {
+ SAFE_ASSERT(pc != nullptr);
+
+ SymbolCacheLine *line = GetCacheLine(pc);
+ uint32_t max_age = 0;
+ int oldest_index = -1;
+ for (size_t i = 0; i < ABSL_ARRAYSIZE(line->pc); ++i) {
+ if (line->pc[i] == nullptr) {
+ AgeSymbols(line);
+ line->pc[i] = pc;
+ line->name[i] = CopyString(name);
+ line->age[i] = 0;
+ return line->name[i];
+ }
+ if (line->age[i] >= max_age) {
+ max_age = line->age[i];
+ oldest_index = i;
+ }
+ }
+
+ AgeSymbols(line);
+ ABSL_RAW_CHECK(oldest_index >= 0, "Corrupt cache");
+ base_internal::LowLevelAlloc::Free(line->name[oldest_index]);
+ line->pc[oldest_index] = pc;
+ line->name[oldest_index] = CopyString(name);
+ line->age[oldest_index] = 0;
+ return line->name[oldest_index];
+}
+
+static void MaybeOpenFdFromSelfExe(ObjFile *obj) {
+ if (memcmp(obj->start_addr, ELFMAG, SELFMAG) != 0) {
+ return;
+ }
+ int fd = open("/proc/self/exe", O_RDONLY);
+ if (fd == -1) {
+ return;
+ }
+ // Verify that contents of /proc/self/exe matches in-memory image of
+ // the binary. This can fail if the "deleted" binary is in fact not
+ // the main executable, or for binaries that have the first PT_LOAD
+ // segment smaller than 4K. We do it in four steps so that the
+ // buffer is smaller and we don't consume too much stack space.
+ const char *mem = reinterpret_cast<const char *>(obj->start_addr);
+ for (int i = 0; i < 4; ++i) {
+ char buf[1024];
+ ssize_t n = read(fd, buf, sizeof(buf));
+ if (n != sizeof(buf) || memcmp(buf, mem, sizeof(buf)) != 0) {
+ close(fd);
+ return;
+ }
+ mem += sizeof(buf);
+ }
+ obj->fd = fd;
+}
+
+static bool MaybeInitializeObjFile(ObjFile *obj) {
+ if (obj->fd < 0) {
+ obj->fd = open(obj->filename, O_RDONLY);
+
+ if (obj->fd < 0) {
+ // Getting /proc/self/exe here means that we were hinted.
+ if (strcmp(obj->filename, "/proc/self/exe") == 0) {
+ // /proc/self/exe may be inaccessible (due to setuid, etc.), so try
+ // accessing the binary via argv0.
+ if (argv0_value != nullptr) {
+ obj->fd = open(argv0_value, O_RDONLY);
+ }
+ } else {
+ MaybeOpenFdFromSelfExe(obj);
+ }
+ }
+
+ if (obj->fd < 0) {
+ ABSL_RAW_LOG(WARNING, "%s: open failed: errno=%d", obj->filename, errno);
+ return false;
+ }
+ obj->elf_type = FileGetElfType(obj->fd);
+ if (obj->elf_type < 0) {
+ ABSL_RAW_LOG(WARNING, "%s: wrong elf type: %d", obj->filename,
+ obj->elf_type);
+ return false;
+ }
+
+ if (!ReadFromOffsetExact(obj->fd, &obj->elf_header, sizeof(obj->elf_header),
+ 0)) {
+ ABSL_RAW_LOG(WARNING, "%s: failed to read elf header", obj->filename);
+ return false;
+ }
+ const int phnum = obj->elf_header.e_phnum;
+ const int phentsize = obj->elf_header.e_phentsize;
+ size_t phoff = obj->elf_header.e_phoff;
+ size_t num_executable_load_segments = 0;
+ for (int j = 0; j < phnum; j++) {
+ ElfW(Phdr) phdr;
+ if (!ReadFromOffsetExact(obj->fd, &phdr, sizeof(phdr), phoff)) {
+ ABSL_RAW_LOG(WARNING, "%s: failed to read program header %d",
+ obj->filename, j);
+ return false;
+ }
+ phoff += phentsize;
+ constexpr int rx = PF_X | PF_R;
+ if (phdr.p_type != PT_LOAD || (phdr.p_flags & rx) != rx) {
+ // Not a LOAD segment, or not executable code.
+ continue;
+ }
+ if (num_executable_load_segments < obj->phdr.size()) {
+ memcpy(&obj->phdr[num_executable_load_segments++], &phdr, sizeof(phdr));
+ } else {
+ ABSL_RAW_LOG(WARNING, "%s: too many executable LOAD segments",
+ obj->filename);
+ break;
+ }
+ }
+ if (num_executable_load_segments == 0) {
+ // This object has no "r-x" LOAD segments. That's unexpected.
+ ABSL_RAW_LOG(WARNING, "%s: no executable LOAD segments", obj->filename);
+ return false;
+ }
+ }
+ return true;
+}
+
+// The implementation of our symbolization routine. If it
+// successfully finds the symbol containing "pc" and obtains the
+// symbol name, returns pointer to that symbol. Otherwise, returns nullptr.
+// If any symbol decorators have been installed via InstallSymbolDecorator(),
+// they are called here as well.
+// To keep stack consumption low, we would like this function to not
+// get inlined.
+const char *Symbolizer::GetSymbol(const void *const pc) {
+ const char *entry = FindSymbolInCache(pc);
+ if (entry != nullptr) {
+ return entry;
+ }
+ symbol_buf_[0] = '\0';
+
+ ObjFile *const obj = FindObjFile(pc, 1);
+ ptrdiff_t relocation = 0;
+ int fd = -1;
+ if (obj != nullptr) {
+ if (MaybeInitializeObjFile(obj)) {
+ const size_t start_addr = reinterpret_cast<size_t>(obj->start_addr);
+ if (obj->elf_type == ET_DYN && start_addr >= obj->offset) {
+ // This object was relocated.
+ //
+ // For obj->offset > 0, adjust the relocation since a mapping at offset
+ // X in the file will have a start address of [true relocation]+X.
+ relocation = start_addr - obj->offset;
+
+ // Note: some binaries have multiple "rx" LOAD segments. We must
+ // find the right one.
+ ElfW(Phdr) *phdr = nullptr;
+ for (size_t j = 0; j < obj->phdr.size(); j++) {
+ ElfW(Phdr) &p = obj->phdr[j];
+ if (p.p_type != PT_LOAD) {
+ // We only expect PT_LOADs. This must be PT_NULL that we didn't
+ // write over (i.e. we exhausted all interesting PT_LOADs).
+ ABSL_RAW_CHECK(p.p_type == PT_NULL, "unexpected p_type");
+ break;
+ }
+ if (pc < reinterpret_cast<void *>(start_addr + p.p_memsz)) {
+ phdr = &p;
+ break;
+ }
+ }
+ if (phdr == nullptr) {
+ // That's unexpected. Hope for the best.
+ ABSL_RAW_LOG(
+ WARNING,
+ "%s: unable to find LOAD segment for pc: %p, start_addr: %zx",
+ obj->filename, pc, start_addr);
+ } else {
+ // Adjust relocation in case phdr.p_vaddr != 0.
+ // This happens for binaries linked with `lld --rosegment`, and for
+ // binaries linked with BFD `ld -z separate-code`.
+ relocation -= phdr->p_vaddr - phdr->p_offset;
+ }
+ }
+
+ fd = obj->fd;
+ if (GetSymbolFromObjectFile(*obj, pc, relocation, symbol_buf_,
+ sizeof(symbol_buf_), tmp_buf_,
+ sizeof(tmp_buf_)) == SYMBOL_FOUND) {
+ // Only try to demangle the symbol name if it fit into symbol_buf_.
+ DemangleInplace(symbol_buf_, sizeof(symbol_buf_), tmp_buf_,
+ sizeof(tmp_buf_));
+ }
+ }
+ } else {
+#if ABSL_HAVE_VDSO_SUPPORT
+ VDSOSupport vdso;
+ if (vdso.IsPresent()) {
+ VDSOSupport::SymbolInfo symbol_info;
+ if (vdso.LookupSymbolByAddress(pc, &symbol_info)) {
+ // All VDSO symbols are known to be short.
+ size_t len = strlen(symbol_info.name);
+ ABSL_RAW_CHECK(len + 1 < sizeof(symbol_buf_),
+ "VDSO symbol unexpectedly long");
+ memcpy(symbol_buf_, symbol_info.name, len + 1);
+ }
+ }
+#endif
+ }
+
+ if (g_decorators_mu.TryLock()) {
+ if (g_num_decorators > 0) {
+ SymbolDecoratorArgs decorator_args = {
+ pc, relocation, fd, symbol_buf_, sizeof(symbol_buf_),
+ tmp_buf_, sizeof(tmp_buf_), nullptr};
+ for (int i = 0; i < g_num_decorators; ++i) {
+ decorator_args.arg = g_decorators[i].arg;
+ g_decorators[i].fn(&decorator_args);
+ }
+ }
+ g_decorators_mu.Unlock();
+ }
+ if (symbol_buf_[0] == '\0') {
+ return nullptr;
+ }
+ symbol_buf_[sizeof(symbol_buf_) - 1] = '\0'; // Paranoia.
+ return InsertSymbolInCache(pc, symbol_buf_);
+}
+
+bool RemoveAllSymbolDecorators(void) {
+ if (!g_decorators_mu.TryLock()) {
+ // Someone else is using decorators. Get out.
+ return false;
+ }
+ g_num_decorators = 0;
+ g_decorators_mu.Unlock();
+ return true;
+}
+
+bool RemoveSymbolDecorator(int ticket) {
+ if (!g_decorators_mu.TryLock()) {
+ // Someone else is using decorators. Get out.
+ return false;
+ }
+ for (int i = 0; i < g_num_decorators; ++i) {
+ if (g_decorators[i].ticket == ticket) {
+ while (i < g_num_decorators - 1) {
+ g_decorators[i] = g_decorators[i + 1];
+ ++i;
+ }
+ g_num_decorators = i;
+ break;
+ }
+ }
+ g_decorators_mu.Unlock();
+ return true; // Decorator is known to be removed.
+}
+
+int InstallSymbolDecorator(SymbolDecorator decorator, void *arg) {
+ static int ticket = 0;
+
+ if (!g_decorators_mu.TryLock()) {
+ // Someone else is using decorators. Get out.
+ return -2;
+ }
+ int ret = ticket;
+ if (g_num_decorators >= kMaxDecorators) {
+ ret = -1;
+ } else {
+ g_decorators[g_num_decorators] = {decorator, arg, ticket++};
+ ++g_num_decorators;
+ }
+ g_decorators_mu.Unlock();
+ return ret;
+}
+
+bool RegisterFileMappingHint(const void *start, const void *end, uint64_t offset,
+ const char *filename) {
+ SAFE_ASSERT(start <= end);
+ SAFE_ASSERT(filename != nullptr);
+
+ InitSigSafeArena();
+
+ if (!g_file_mapping_mu.TryLock()) {
+ return false;
+ }
+
+ bool ret = true;
+ if (g_num_file_mapping_hints >= kMaxFileMappingHints) {
+ ret = false;
+ } else {
+ // TODO(ckennelly): Move this into a string copy routine.
+ int len = strlen(filename);
+ char *dst = static_cast<char *>(
+ base_internal::LowLevelAlloc::AllocWithArena(len + 1, SigSafeArena()));
+ ABSL_RAW_CHECK(dst != nullptr, "out of memory");
+ memcpy(dst, filename, len + 1);
+
+ auto &hint = g_file_mapping_hints[g_num_file_mapping_hints++];
+ hint.start = start;
+ hint.end = end;
+ hint.offset = offset;
+ hint.filename = dst;
+ }
+
+ g_file_mapping_mu.Unlock();
+ return ret;
+}
+
+bool GetFileMappingHint(const void **start, const void **end, uint64_t *offset,
+ const char **filename) {
+ if (!g_file_mapping_mu.TryLock()) {
+ return false;
+ }
+ bool found = false;
+ for (int i = 0; i < g_num_file_mapping_hints; i++) {
+ if (g_file_mapping_hints[i].start <= *start &&
+ *end <= g_file_mapping_hints[i].end) {
+ // We assume that the start_address for the mapping is the base
+ // address of the ELF section, but when [start_address,end_address) is
+ // not strictly equal to [hint.start, hint.end), that assumption is
+ // invalid.
+ //
+ // This uses the hint's start address (even though hint.start is not
+ // necessarily equal to start_address) to ensure the correct
+ // relocation is computed later.
+ *start = g_file_mapping_hints[i].start;
+ *end = g_file_mapping_hints[i].end;
+ *offset = g_file_mapping_hints[i].offset;
+ *filename = g_file_mapping_hints[i].filename;
+ found = true;
+ break;
+ }
+ }
+ g_file_mapping_mu.Unlock();
+ return found;
+}
+
+} // namespace debugging_internal
+
+bool Symbolize(const void *pc, char *out, int out_size) {
+ // Symbolization is very slow under tsan.
+ ABSL_ANNOTATE_IGNORE_READS_AND_WRITES_BEGIN();
+ SAFE_ASSERT(out_size >= 0);
+ debugging_internal::Symbolizer *s = debugging_internal::AllocateSymbolizer();
+ const char *name = s->GetSymbol(pc);
+ bool ok = false;
+ if (name != nullptr && out_size > 0) {
+ strncpy(out, name, out_size);
+ ok = true;
+ if (out[out_size - 1] != '\0') {
+ // strncpy() does not '\0' terminate when it truncates. Do so, with
+ // trailing ellipsis.
+ static constexpr char kEllipsis[] = "...";
+ int ellipsis_size =
+ std::min(implicit_cast<int>(strlen(kEllipsis)), out_size - 1);
+ memcpy(out + out_size - ellipsis_size - 1, kEllipsis, ellipsis_size);
+ out[out_size - 1] = '\0';
+ }
+ }
+ debugging_internal::FreeSymbolizer(s);
+ ABSL_ANNOTATE_IGNORE_READS_AND_WRITES_END();
+ return ok;
+}
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+extern "C" bool AbslInternalGetFileMappingHint(const void **start,
+ const void **end, uint64_t *offset,
+ const char **filename) {
+ return absl::debugging_internal::GetFileMappingHint(start, end, offset,
+ filename);
+}
diff --git a/third_party/abseil/src/absl/debugging/symbolize_test.cc b/third_party/abseil/src/absl/debugging/symbolize_test.cc
new file mode 100644
index 0000000..a2dd495
--- /dev/null
+++ b/third_party/abseil/src/absl/debugging/symbolize_test.cc
@@ -0,0 +1,557 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/debugging/symbolize.h"
+
+#ifndef _WIN32
+#include <fcntl.h>
+#include <sys/mman.h>
+#endif
+
+#include <cstring>
+#include <iostream>
+#include <memory>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/base/attributes.h"
+#include "absl/base/casts.h"
+#include "absl/base/config.h"
+#include "absl/base/internal/per_thread_tls.h"
+#include "absl/base/internal/raw_logging.h"
+#include "absl/base/optimization.h"
+#include "absl/debugging/internal/stack_consumption.h"
+#include "absl/memory/memory.h"
+#include "absl/strings/string_view.h"
+
+using testing::Contains;
+
+#ifdef _WIN32
+#define ABSL_SYMBOLIZE_TEST_NOINLINE __declspec(noinline)
+#else
+#define ABSL_SYMBOLIZE_TEST_NOINLINE ABSL_ATTRIBUTE_NOINLINE
+#endif
+
+// Functions to symbolize. Use C linkage to avoid mangled names.
+extern "C" {
+ABSL_SYMBOLIZE_TEST_NOINLINE void nonstatic_func() {
+ // The next line makes this a unique function to prevent the compiler from
+ // folding identical functions together.
+ volatile int x = __LINE__;
+ static_cast<void>(x);
+ ABSL_BLOCK_TAIL_CALL_OPTIMIZATION();
+}
+
+ABSL_SYMBOLIZE_TEST_NOINLINE static void static_func() {
+ // The next line makes this a unique function to prevent the compiler from
+ // folding identical functions together.
+ volatile int x = __LINE__;
+ static_cast<void>(x);
+ ABSL_BLOCK_TAIL_CALL_OPTIMIZATION();
+}
+} // extern "C"
+
+struct Foo {
+ static void func(int x);
+};
+
+// A C++ method that should have a mangled name.
+ABSL_SYMBOLIZE_TEST_NOINLINE void Foo::func(int) {
+ // The next line makes this a unique function to prevent the compiler from
+ // folding identical functions together.
+ volatile int x = __LINE__;
+ static_cast<void>(x);
+ ABSL_BLOCK_TAIL_CALL_OPTIMIZATION();
+}
+
+// Create functions that will remain in different text sections in the
+// final binary when linker option "-z,keep-text-section-prefix" is used.
+int ABSL_ATTRIBUTE_SECTION_VARIABLE(.text.unlikely) unlikely_func() {
+ return 0;
+}
+
+int ABSL_ATTRIBUTE_SECTION_VARIABLE(.text.hot) hot_func() {
+ return 0;
+}
+
+int ABSL_ATTRIBUTE_SECTION_VARIABLE(.text.startup) startup_func() {
+ return 0;
+}
+
+int ABSL_ATTRIBUTE_SECTION_VARIABLE(.text.exit) exit_func() {
+ return 0;
+}
+
+int /*ABSL_ATTRIBUTE_SECTION_VARIABLE(.text)*/ regular_func() {
+ return 0;
+}
+
+// Thread-local data may confuse the symbolizer, ensure that it does not.
+// Variable sizes and order are important.
+#if ABSL_PER_THREAD_TLS
+static ABSL_PER_THREAD_TLS_KEYWORD char symbolize_test_thread_small[1];
+static ABSL_PER_THREAD_TLS_KEYWORD char
+ symbolize_test_thread_big[2 * 1024 * 1024];
+#endif
+
+#if !defined(__EMSCRIPTEN__)
+// Used below to hopefully inhibit some compiler/linker optimizations
+// that may remove kHpageTextPadding, kPadding0, and kPadding1 from
+// the binary.
+static volatile bool volatile_bool = false;
+
+// Force the binary to be large enough that a THP .text remap will succeed.
+static constexpr size_t kHpageSize = 1 << 21;
+const char kHpageTextPadding[kHpageSize * 4] ABSL_ATTRIBUTE_SECTION_VARIABLE(
+ .text) = "";
+#endif // !defined(__EMSCRIPTEN__)
+
+static char try_symbolize_buffer[4096];
+
+// A wrapper function for absl::Symbolize() to make the unit test simple. The
+// limit must be < sizeof(try_symbolize_buffer). Returns null if
+// absl::Symbolize() returns false, otherwise returns try_symbolize_buffer with
+// the result of absl::Symbolize().
+static const char *TrySymbolizeWithLimit(void *pc, int limit) {
+ ABSL_RAW_CHECK(limit <= sizeof(try_symbolize_buffer),
+ "try_symbolize_buffer is too small");
+
+ // Use the heap to facilitate heap and buffer sanitizer tools.
+ auto heap_buffer = absl::make_unique<char[]>(sizeof(try_symbolize_buffer));
+ bool found = absl::Symbolize(pc, heap_buffer.get(), limit);
+ if (found) {
+ ABSL_RAW_CHECK(strnlen(heap_buffer.get(), limit) < limit,
+ "absl::Symbolize() did not properly terminate the string");
+ strncpy(try_symbolize_buffer, heap_buffer.get(),
+ sizeof(try_symbolize_buffer) - 1);
+ try_symbolize_buffer[sizeof(try_symbolize_buffer) - 1] = '\0';
+ }
+
+ return found ? try_symbolize_buffer : nullptr;
+}
+
+// A wrapper for TrySymbolizeWithLimit(), with a large limit.
+static const char *TrySymbolize(void *pc) {
+ return TrySymbolizeWithLimit(pc, sizeof(try_symbolize_buffer));
+}
+
+#if defined(ABSL_INTERNAL_HAVE_ELF_SYMBOLIZE) || \
+ defined(ABSL_INTERNAL_HAVE_DARWIN_SYMBOLIZE)
+
+TEST(Symbolize, Cached) {
+ // Compilers should give us pointers to them.
+ EXPECT_STREQ("nonstatic_func", TrySymbolize((void *)(&nonstatic_func)));
+
+ // The name of an internal linkage symbol is not specified; allow either a
+ // mangled or an unmangled name here.
+ const char *static_func_symbol = TrySymbolize((void *)(&static_func));
+ EXPECT_TRUE(strcmp("static_func", static_func_symbol) == 0 ||
+ strcmp("static_func()", static_func_symbol) == 0);
+
+ EXPECT_TRUE(nullptr == TrySymbolize(nullptr));
+}
+
+TEST(Symbolize, Truncation) {
+ constexpr char kNonStaticFunc[] = "nonstatic_func";
+ EXPECT_STREQ("nonstatic_func",
+ TrySymbolizeWithLimit((void *)(&nonstatic_func),
+ strlen(kNonStaticFunc) + 1));
+ EXPECT_STREQ("nonstatic_...",
+ TrySymbolizeWithLimit((void *)(&nonstatic_func),
+ strlen(kNonStaticFunc) + 0));
+ EXPECT_STREQ("nonstatic...",
+ TrySymbolizeWithLimit((void *)(&nonstatic_func),
+ strlen(kNonStaticFunc) - 1));
+ EXPECT_STREQ("n...", TrySymbolizeWithLimit((void *)(&nonstatic_func), 5));
+ EXPECT_STREQ("...", TrySymbolizeWithLimit((void *)(&nonstatic_func), 4));
+ EXPECT_STREQ("..", TrySymbolizeWithLimit((void *)(&nonstatic_func), 3));
+ EXPECT_STREQ(".", TrySymbolizeWithLimit((void *)(&nonstatic_func), 2));
+ EXPECT_STREQ("", TrySymbolizeWithLimit((void *)(&nonstatic_func), 1));
+ EXPECT_EQ(nullptr, TrySymbolizeWithLimit((void *)(&nonstatic_func), 0));
+}
+
+TEST(Symbolize, SymbolizeWithDemangling) {
+ Foo::func(100);
+ EXPECT_STREQ("Foo::func()", TrySymbolize((void *)(&Foo::func)));
+}
+
+TEST(Symbolize, SymbolizeSplitTextSections) {
+ EXPECT_STREQ("unlikely_func()", TrySymbolize((void *)(&unlikely_func)));
+ EXPECT_STREQ("hot_func()", TrySymbolize((void *)(&hot_func)));
+ EXPECT_STREQ("startup_func()", TrySymbolize((void *)(&startup_func)));
+ EXPECT_STREQ("exit_func()", TrySymbolize((void *)(&exit_func)));
+ EXPECT_STREQ("regular_func()", TrySymbolize((void *)(®ular_func)));
+}
+
+// Tests that verify that Symbolize stack footprint is within some limit.
+#ifdef ABSL_INTERNAL_HAVE_DEBUGGING_STACK_CONSUMPTION
+
+static void *g_pc_to_symbolize;
+static char g_symbolize_buffer[4096];
+static char *g_symbolize_result;
+
+static void SymbolizeSignalHandler(int signo) {
+ if (absl::Symbolize(g_pc_to_symbolize, g_symbolize_buffer,
+ sizeof(g_symbolize_buffer))) {
+ g_symbolize_result = g_symbolize_buffer;
+ } else {
+ g_symbolize_result = nullptr;
+ }
+}
+
+// Call Symbolize and figure out the stack footprint of this call.
+static const char *SymbolizeStackConsumption(void *pc, int *stack_consumed) {
+ g_pc_to_symbolize = pc;
+ *stack_consumed = absl::debugging_internal::GetSignalHandlerStackConsumption(
+ SymbolizeSignalHandler);
+ return g_symbolize_result;
+}
+
+static int GetStackConsumptionUpperLimit() {
+ // Symbolize stack consumption should be within 2kB.
+ int stack_consumption_upper_limit = 2048;
+#if defined(ABSL_HAVE_ADDRESS_SANITIZER) || \
+ defined(ABSL_HAVE_MEMORY_SANITIZER) || defined(ABSL_HAVE_THREAD_SANITIZER)
+ // Account for sanitizer instrumentation requiring additional stack space.
+ stack_consumption_upper_limit *= 5;
+#endif
+ return stack_consumption_upper_limit;
+}
+
+TEST(Symbolize, SymbolizeStackConsumption) {
+ int stack_consumed = 0;
+
+ const char *symbol =
+ SymbolizeStackConsumption((void *)(&nonstatic_func), &stack_consumed);
+ EXPECT_STREQ("nonstatic_func", symbol);
+ EXPECT_GT(stack_consumed, 0);
+ EXPECT_LT(stack_consumed, GetStackConsumptionUpperLimit());
+
+ // The name of an internal linkage symbol is not specified; allow either a
+ // mangled or an unmangled name here.
+ symbol = SymbolizeStackConsumption((void *)(&static_func), &stack_consumed);
+ EXPECT_TRUE(strcmp("static_func", symbol) == 0 ||
+ strcmp("static_func()", symbol) == 0);
+ EXPECT_GT(stack_consumed, 0);
+ EXPECT_LT(stack_consumed, GetStackConsumptionUpperLimit());
+}
+
+TEST(Symbolize, SymbolizeWithDemanglingStackConsumption) {
+ Foo::func(100);
+ int stack_consumed = 0;
+
+ const char *symbol =
+ SymbolizeStackConsumption((void *)(&Foo::func), &stack_consumed);
+
+ EXPECT_STREQ("Foo::func()", symbol);
+ EXPECT_GT(stack_consumed, 0);
+ EXPECT_LT(stack_consumed, GetStackConsumptionUpperLimit());
+}
+
+#endif // ABSL_INTERNAL_HAVE_DEBUGGING_STACK_CONSUMPTION
+
+#ifndef ABSL_INTERNAL_HAVE_DARWIN_SYMBOLIZE
+// Use a 64K page size for PPC.
+const size_t kPageSize = 64 << 10;
+// We place a read-only symbols into the .text section and verify that we can
+// symbolize them and other symbols after remapping them.
+const char kPadding0[kPageSize * 4] ABSL_ATTRIBUTE_SECTION_VARIABLE(.text) =
+ "";
+const char kPadding1[kPageSize * 4] ABSL_ATTRIBUTE_SECTION_VARIABLE(.text) =
+ "";
+
+static int FilterElfHeader(struct dl_phdr_info *info, size_t size, void *data) {
+ for (int i = 0; i < info->dlpi_phnum; i++) {
+ if (info->dlpi_phdr[i].p_type == PT_LOAD &&
+ info->dlpi_phdr[i].p_flags == (PF_R | PF_X)) {
+ const void *const vaddr =
+ absl::bit_cast<void *>(info->dlpi_addr + info->dlpi_phdr[i].p_vaddr);
+ const auto segsize = info->dlpi_phdr[i].p_memsz;
+
+ const char *self_exe;
+ if (info->dlpi_name != nullptr && info->dlpi_name[0] != '\0') {
+ self_exe = info->dlpi_name;
+ } else {
+ self_exe = "/proc/self/exe";
+ }
+
+ absl::debugging_internal::RegisterFileMappingHint(
+ vaddr, reinterpret_cast<const char *>(vaddr) + segsize,
+ info->dlpi_phdr[i].p_offset, self_exe);
+
+ return 1;
+ }
+ }
+
+ return 1;
+}
+
+TEST(Symbolize, SymbolizeWithMultipleMaps) {
+ // Force kPadding0 and kPadding1 to be linked in.
+ if (volatile_bool) {
+ ABSL_RAW_LOG(INFO, "%s", kPadding0);
+ ABSL_RAW_LOG(INFO, "%s", kPadding1);
+ }
+
+ // Verify we can symbolize everything.
+ char buf[512];
+ memset(buf, 0, sizeof(buf));
+ absl::Symbolize(kPadding0, buf, sizeof(buf));
+ EXPECT_STREQ("kPadding0", buf);
+
+ memset(buf, 0, sizeof(buf));
+ absl::Symbolize(kPadding1, buf, sizeof(buf));
+ EXPECT_STREQ("kPadding1", buf);
+
+ // Specify a hint for the executable segment.
+ dl_iterate_phdr(FilterElfHeader, nullptr);
+
+ // Reload at least one page out of kPadding0, kPadding1
+ const char *ptrs[] = {kPadding0, kPadding1};
+
+ for (const char *ptr : ptrs) {
+ const int kMapFlags = MAP_ANONYMOUS | MAP_PRIVATE;
+ void *addr = mmap(nullptr, kPageSize, PROT_READ, kMapFlags, 0, 0);
+ ASSERT_NE(addr, MAP_FAILED);
+
+ // kPadding[0-1] is full of zeroes, so we can remap anywhere within it, but
+ // we ensure there is at least a full page of padding.
+ void *remapped = reinterpret_cast<void *>(
+ reinterpret_cast<uintptr_t>(ptr + kPageSize) & ~(kPageSize - 1ULL));
+
+ const int kMremapFlags = (MREMAP_MAYMOVE | MREMAP_FIXED);
+ void *ret = mremap(addr, kPageSize, kPageSize, kMremapFlags, remapped);
+ ASSERT_NE(ret, MAP_FAILED);
+ }
+
+ // Invalidate the symbolization cache so we are forced to rely on the hint.
+ absl::Symbolize(nullptr, buf, sizeof(buf));
+
+ // Verify we can still symbolize.
+ const char *expected[] = {"kPadding0", "kPadding1"};
+ const size_t offsets[] = {0, kPageSize, 2 * kPageSize, 3 * kPageSize};
+
+ for (int i = 0; i < 2; i++) {
+ for (size_t offset : offsets) {
+ memset(buf, 0, sizeof(buf));
+ absl::Symbolize(ptrs[i] + offset, buf, sizeof(buf));
+ EXPECT_STREQ(expected[i], buf);
+ }
+ }
+}
+
+// Appends string(*args->arg) to args->symbol_buf.
+static void DummySymbolDecorator(
+ const absl::debugging_internal::SymbolDecoratorArgs *args) {
+ std::string *message = static_cast<std::string *>(args->arg);
+ strncat(args->symbol_buf, message->c_str(),
+ args->symbol_buf_size - strlen(args->symbol_buf) - 1);
+}
+
+TEST(Symbolize, InstallAndRemoveSymbolDecorators) {
+ int ticket_a;
+ std::string a_message("a");
+ EXPECT_GE(ticket_a = absl::debugging_internal::InstallSymbolDecorator(
+ DummySymbolDecorator, &a_message),
+ 0);
+
+ int ticket_b;
+ std::string b_message("b");
+ EXPECT_GE(ticket_b = absl::debugging_internal::InstallSymbolDecorator(
+ DummySymbolDecorator, &b_message),
+ 0);
+
+ int ticket_c;
+ std::string c_message("c");
+ EXPECT_GE(ticket_c = absl::debugging_internal::InstallSymbolDecorator(
+ DummySymbolDecorator, &c_message),
+ 0);
+
+ char *address = reinterpret_cast<char *>(1);
+ EXPECT_STREQ("abc", TrySymbolize(address++));
+
+ EXPECT_TRUE(absl::debugging_internal::RemoveSymbolDecorator(ticket_b));
+
+ EXPECT_STREQ("ac", TrySymbolize(address++));
+
+ // Cleanup: remove all remaining decorators so other stack traces don't
+ // get mystery "ac" decoration.
+ EXPECT_TRUE(absl::debugging_internal::RemoveSymbolDecorator(ticket_a));
+ EXPECT_TRUE(absl::debugging_internal::RemoveSymbolDecorator(ticket_c));
+}
+
+// Some versions of Clang with optimizations enabled seem to be able
+// to optimize away the .data section if no variables live in the
+// section. This variable should get placed in the .data section, and
+// the test below checks for the existence of a .data section.
+static int in_data_section = 1;
+
+TEST(Symbolize, ForEachSection) {
+ int fd = TEMP_FAILURE_RETRY(open("/proc/self/exe", O_RDONLY));
+ ASSERT_NE(fd, -1);
+
+ std::vector<std::string> sections;
+ ASSERT_TRUE(absl::debugging_internal::ForEachSection(
+ fd, [§ions](const absl::string_view name, const ElfW(Shdr) &) {
+ sections.emplace_back(name);
+ return true;
+ }));
+
+ // Check for the presence of common section names.
+ EXPECT_THAT(sections, Contains(".text"));
+ EXPECT_THAT(sections, Contains(".rodata"));
+ EXPECT_THAT(sections, Contains(".bss"));
+ ++in_data_section;
+ EXPECT_THAT(sections, Contains(".data"));
+
+ close(fd);
+}
+#endif // !ABSL_INTERNAL_HAVE_DARWIN_SYMBOLIZE
+
+// x86 specific tests. Uses some inline assembler.
+extern "C" {
+inline void *ABSL_ATTRIBUTE_ALWAYS_INLINE inline_func() {
+ void *pc = nullptr;
+#if defined(__i386__)
+ __asm__ __volatile__("call 1f;\n 1: pop %[PC]" : [ PC ] "=r"(pc));
+#elif defined(__x86_64__)
+ __asm__ __volatile__("leaq 0(%%rip),%[PC];\n" : [ PC ] "=r"(pc));
+#endif
+ return pc;
+}
+
+void *ABSL_ATTRIBUTE_NOINLINE non_inline_func() {
+ void *pc = nullptr;
+#if defined(__i386__)
+ __asm__ __volatile__("call 1f;\n 1: pop %[PC]" : [ PC ] "=r"(pc));
+#elif defined(__x86_64__)
+ __asm__ __volatile__("leaq 0(%%rip),%[PC];\n" : [ PC ] "=r"(pc));
+#endif
+ return pc;
+}
+
+void ABSL_ATTRIBUTE_NOINLINE TestWithPCInsideNonInlineFunction() {
+#if defined(ABSL_HAVE_ATTRIBUTE_NOINLINE) && \
+ (defined(__i386__) || defined(__x86_64__))
+ void *pc = non_inline_func();
+ const char *symbol = TrySymbolize(pc);
+ ABSL_RAW_CHECK(symbol != nullptr, "TestWithPCInsideNonInlineFunction failed");
+ ABSL_RAW_CHECK(strcmp(symbol, "non_inline_func") == 0,
+ "TestWithPCInsideNonInlineFunction failed");
+ std::cout << "TestWithPCInsideNonInlineFunction passed" << std::endl;
+#endif
+}
+
+void ABSL_ATTRIBUTE_NOINLINE TestWithPCInsideInlineFunction() {
+#if defined(ABSL_HAVE_ATTRIBUTE_ALWAYS_INLINE) && \
+ (defined(__i386__) || defined(__x86_64__))
+ void *pc = inline_func(); // Must be inlined.
+ const char *symbol = TrySymbolize(pc);
+ ABSL_RAW_CHECK(symbol != nullptr, "TestWithPCInsideInlineFunction failed");
+ ABSL_RAW_CHECK(strcmp(symbol, __FUNCTION__) == 0,
+ "TestWithPCInsideInlineFunction failed");
+ std::cout << "TestWithPCInsideInlineFunction passed" << std::endl;
+#endif
+}
+}
+
+// Test with a return address.
+void ABSL_ATTRIBUTE_NOINLINE TestWithReturnAddress() {
+#if defined(ABSL_HAVE_ATTRIBUTE_NOINLINE)
+ void *return_address = __builtin_return_address(0);
+ const char *symbol = TrySymbolize(return_address);
+ ABSL_RAW_CHECK(symbol != nullptr, "TestWithReturnAddress failed");
+ ABSL_RAW_CHECK(strcmp(symbol, "main") == 0, "TestWithReturnAddress failed");
+ std::cout << "TestWithReturnAddress passed" << std::endl;
+#endif
+}
+
+#elif defined(_WIN32)
+#if !defined(ABSL_CONSUME_DLL)
+
+TEST(Symbolize, Basics) {
+ EXPECT_STREQ("nonstatic_func", TrySymbolize((void *)(&nonstatic_func)));
+
+ // The name of an internal linkage symbol is not specified; allow either a
+ // mangled or an unmangled name here.
+ const char *static_func_symbol = TrySymbolize((void *)(&static_func));
+ ASSERT_TRUE(static_func_symbol != nullptr);
+ EXPECT_TRUE(strstr(static_func_symbol, "static_func") != nullptr);
+
+ EXPECT_TRUE(nullptr == TrySymbolize(nullptr));
+}
+
+TEST(Symbolize, Truncation) {
+ constexpr char kNonStaticFunc[] = "nonstatic_func";
+ EXPECT_STREQ("nonstatic_func",
+ TrySymbolizeWithLimit((void *)(&nonstatic_func),
+ strlen(kNonStaticFunc) + 1));
+ EXPECT_STREQ("nonstatic_...",
+ TrySymbolizeWithLimit((void *)(&nonstatic_func),
+ strlen(kNonStaticFunc) + 0));
+ EXPECT_STREQ("nonstatic...",
+ TrySymbolizeWithLimit((void *)(&nonstatic_func),
+ strlen(kNonStaticFunc) - 1));
+ EXPECT_STREQ("n...", TrySymbolizeWithLimit((void *)(&nonstatic_func), 5));
+ EXPECT_STREQ("...", TrySymbolizeWithLimit((void *)(&nonstatic_func), 4));
+ EXPECT_STREQ("..", TrySymbolizeWithLimit((void *)(&nonstatic_func), 3));
+ EXPECT_STREQ(".", TrySymbolizeWithLimit((void *)(&nonstatic_func), 2));
+ EXPECT_STREQ("", TrySymbolizeWithLimit((void *)(&nonstatic_func), 1));
+ EXPECT_EQ(nullptr, TrySymbolizeWithLimit((void *)(&nonstatic_func), 0));
+}
+
+TEST(Symbolize, SymbolizeWithDemangling) {
+ const char *result = TrySymbolize((void *)(&Foo::func));
+ ASSERT_TRUE(result != nullptr);
+ EXPECT_TRUE(strstr(result, "Foo::func") != nullptr) << result;
+}
+
+#endif // !defined(ABSL_CONSUME_DLL)
+#else // Symbolizer unimplemented
+
+TEST(Symbolize, Unimplemented) {
+ char buf[64];
+ EXPECT_FALSE(absl::Symbolize((void *)(&nonstatic_func), buf, sizeof(buf)));
+ EXPECT_FALSE(absl::Symbolize((void *)(&static_func), buf, sizeof(buf)));
+ EXPECT_FALSE(absl::Symbolize((void *)(&Foo::func), buf, sizeof(buf)));
+}
+
+#endif
+
+int main(int argc, char **argv) {
+#if !defined(__EMSCRIPTEN__)
+ // Make sure kHpageTextPadding is linked into the binary.
+ if (volatile_bool) {
+ ABSL_RAW_LOG(INFO, "%s", kHpageTextPadding);
+ }
+#endif // !defined(__EMSCRIPTEN__)
+
+#if ABSL_PER_THREAD_TLS
+ // Touch the per-thread variables.
+ symbolize_test_thread_small[0] = 0;
+ symbolize_test_thread_big[0] = 0;
+#endif
+
+ absl::InitializeSymbolizer(argv[0]);
+ testing::InitGoogleTest(&argc, argv);
+
+#if defined(ABSL_INTERNAL_HAVE_ELF_SYMBOLIZE) || \
+ defined(ABSL_INTERNAL_HAVE_DARWIN_SYMBOLIZE)
+ TestWithPCInsideInlineFunction();
+ TestWithPCInsideNonInlineFunction();
+ TestWithReturnAddress();
+#endif
+
+ return RUN_ALL_TESTS();
+}
diff --git a/third_party/abseil/src/absl/debugging/symbolize_unimplemented.inc b/third_party/abseil/src/absl/debugging/symbolize_unimplemented.inc
new file mode 100644
index 0000000..db24456
--- /dev/null
+++ b/third_party/abseil/src/absl/debugging/symbolize_unimplemented.inc
@@ -0,0 +1,40 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <cstdint>
+
+#include "absl/base/internal/raw_logging.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+namespace debugging_internal {
+
+int InstallSymbolDecorator(SymbolDecorator, void*) { return -1; }
+bool RemoveSymbolDecorator(int) { return false; }
+bool RemoveAllSymbolDecorators(void) { return false; }
+bool RegisterFileMappingHint(const void *, const void *, uint64_t, const char *) {
+ return false;
+}
+bool GetFileMappingHint(const void **, const void **, uint64_t *, const char **) {
+ return false;
+}
+
+} // namespace debugging_internal
+
+void InitializeSymbolizer(const char*) {}
+bool Symbolize(const void *, char *, int) { return false; }
+
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/debugging/symbolize_win32.inc b/third_party/abseil/src/absl/debugging/symbolize_win32.inc
new file mode 100644
index 0000000..c3df46f
--- /dev/null
+++ b/third_party/abseil/src/absl/debugging/symbolize_win32.inc
@@ -0,0 +1,81 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// See "Retrieving Symbol Information by Address":
+// https://msdn.microsoft.com/en-us/library/windows/desktop/ms680578(v=vs.85).aspx
+
+#include <windows.h>
+
+// MSVC header dbghelp.h has a warning for an ignored typedef.
+#pragma warning(push)
+#pragma warning(disable:4091)
+#include <dbghelp.h>
+#pragma warning(pop)
+
+#pragma comment(lib, "dbghelp.lib")
+
+#include <algorithm>
+#include <cstring>
+
+#include "absl/base/internal/raw_logging.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+static HANDLE process = NULL;
+
+void InitializeSymbolizer(const char*) {
+ if (process != nullptr) {
+ return;
+ }
+ process = GetCurrentProcess();
+
+ // Symbols are not loaded until a reference is made requiring the
+ // symbols be loaded. This is the fastest, most efficient way to use
+ // the symbol handler.
+ SymSetOptions(SYMOPT_DEFERRED_LOADS | SYMOPT_UNDNAME);
+ if (!SymInitialize(process, nullptr, true)) {
+ // GetLastError() returns a Win32 DWORD, but we assign to
+ // unsigned long long to simplify the ABSL_RAW_LOG case below. The uniform
+ // initialization guarantees this is not a narrowing conversion.
+ const unsigned long long error{GetLastError()}; // NOLINT(runtime/int)
+ ABSL_RAW_LOG(FATAL, "SymInitialize() failed: %llu", error);
+ }
+}
+
+bool Symbolize(const void* pc, char* out, int out_size) {
+ if (out_size <= 0) {
+ return false;
+ }
+ alignas(SYMBOL_INFO) char buf[sizeof(SYMBOL_INFO) + MAX_SYM_NAME];
+ SYMBOL_INFO* symbol = reinterpret_cast<SYMBOL_INFO*>(buf);
+ symbol->SizeOfStruct = sizeof(SYMBOL_INFO);
+ symbol->MaxNameLen = MAX_SYM_NAME;
+ if (!SymFromAddr(process, reinterpret_cast<DWORD64>(pc), nullptr, symbol)) {
+ return false;
+ }
+ strncpy(out, symbol->Name, out_size);
+ if (out[out_size - 1] != '\0') {
+ // strncpy() does not '\0' terminate when it truncates.
+ static constexpr char kEllipsis[] = "...";
+ int ellipsis_size =
+ std::min<int>(sizeof(kEllipsis) - 1, out_size - 1);
+ memcpy(out + out_size - ellipsis_size - 1, kEllipsis, ellipsis_size);
+ out[out_size - 1] = '\0';
+ }
+ return true;
+}
+
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/flags/BUILD.bazel b/third_party/abseil/src/absl/flags/BUILD.bazel
new file mode 100644
index 0000000..78d6da7
--- /dev/null
+++ b/third_party/abseil/src/absl/flags/BUILD.bazel
@@ -0,0 +1,514 @@
+#
+# Copyright 2019 The Abseil Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+load("@rules_cc//cc:defs.bzl", "cc_binary", "cc_library", "cc_test")
+load(
+ "//absl:copts/configure_copts.bzl",
+ "ABSL_DEFAULT_COPTS",
+ "ABSL_DEFAULT_LINKOPTS",
+ "ABSL_TEST_COPTS",
+)
+
+package(default_visibility = ["//visibility:public"])
+
+licenses(["notice"])
+
+cc_library(
+ name = "path_util",
+ hdrs = [
+ "internal/path_util.h",
+ ],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ visibility = [
+ "//absl/flags:__pkg__",
+ ],
+ deps = [
+ "//absl/base:config",
+ "//absl/strings",
+ ],
+)
+
+cc_library(
+ name = "program_name",
+ srcs = [
+ "internal/program_name.cc",
+ ],
+ hdrs = [
+ "internal/program_name.h",
+ ],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ visibility = [
+ "//absl/flags:__pkg__",
+ ],
+ deps = [
+ ":path_util",
+ "//absl/base:config",
+ "//absl/base:core_headers",
+ "//absl/strings",
+ "//absl/synchronization",
+ ],
+)
+
+cc_library(
+ name = "config",
+ srcs = [
+ "usage_config.cc",
+ ],
+ hdrs = [
+ "config.h",
+ "usage_config.h",
+ ],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":path_util",
+ ":program_name",
+ "//absl/base:config",
+ "//absl/base:core_headers",
+ "//absl/strings",
+ "//absl/synchronization",
+ ],
+)
+
+cc_library(
+ name = "marshalling",
+ srcs = [
+ "marshalling.cc",
+ ],
+ hdrs = [
+ "marshalling.h",
+ ],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ "//absl/base:config",
+ "//absl/base:core_headers",
+ "//absl/base:log_severity",
+ "//absl/strings",
+ "//absl/strings:str_format",
+ ],
+)
+
+cc_library(
+ name = "commandlineflag_internal",
+ srcs = [
+ "internal/commandlineflag.cc",
+ ],
+ hdrs = [
+ "internal/commandlineflag.h",
+ ],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ "//absl/base:config",
+ "//absl/base:fast_type_id",
+ ],
+)
+
+cc_library(
+ name = "commandlineflag",
+ srcs = [
+ "commandlineflag.cc",
+ ],
+ hdrs = [
+ "commandlineflag.h",
+ ],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":commandlineflag_internal",
+ "//absl/base:config",
+ "//absl/base:fast_type_id",
+ "//absl/strings",
+ "//absl/types:optional",
+ ],
+)
+
+cc_library(
+ name = "private_handle_accessor",
+ srcs = [
+ "internal/private_handle_accessor.cc",
+ ],
+ hdrs = [
+ "internal/private_handle_accessor.h",
+ ],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ visibility = [
+ "//absl/flags:__pkg__",
+ ],
+ deps = [
+ ":commandlineflag",
+ ":commandlineflag_internal",
+ "//absl/base:config",
+ "//absl/strings",
+ ],
+)
+
+cc_library(
+ name = "reflection",
+ srcs = [
+ "reflection.cc",
+ ],
+ hdrs = [
+ "internal/registry.h",
+ "reflection.h",
+ ],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":commandlineflag",
+ ":commandlineflag_internal",
+ ":config",
+ ":private_handle_accessor",
+ "//absl/base:config",
+ "//absl/base:core_headers",
+ "//absl/container:flat_hash_map",
+ "//absl/strings",
+ "//absl/synchronization",
+ ],
+)
+
+cc_library(
+ name = "flag_internal",
+ srcs = [
+ "internal/flag.cc",
+ ],
+ hdrs = [
+ "internal/flag.h",
+ ],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ visibility = ["//absl/base:__subpackages__"],
+ deps = [
+ ":commandlineflag",
+ ":commandlineflag_internal",
+ ":config",
+ ":marshalling",
+ ":reflection",
+ "//absl/base",
+ "//absl/base:config",
+ "//absl/base:core_headers",
+ "//absl/memory",
+ "//absl/meta:type_traits",
+ "//absl/strings",
+ "//absl/synchronization",
+ "//absl/utility",
+ ],
+)
+
+cc_library(
+ name = "flag",
+ srcs = [
+ "flag.cc",
+ ],
+ hdrs = [
+ "declare.h",
+ "flag.h",
+ ],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":config",
+ ":flag_internal",
+ ":reflection",
+ "//absl/base",
+ "//absl/base:config",
+ "//absl/base:core_headers",
+ "//absl/strings",
+ ],
+)
+
+cc_library(
+ name = "usage_internal",
+ srcs = [
+ "internal/usage.cc",
+ ],
+ hdrs = [
+ "internal/usage.h",
+ ],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ visibility = [
+ "//absl/flags:__pkg__",
+ ],
+ deps = [
+ ":commandlineflag",
+ ":config",
+ ":flag",
+ ":flag_internal",
+ ":path_util",
+ ":private_handle_accessor",
+ ":program_name",
+ ":reflection",
+ "//absl/base:config",
+ "//absl/base:core_headers",
+ "//absl/strings",
+ ],
+)
+
+cc_library(
+ name = "usage",
+ srcs = [
+ "usage.cc",
+ ],
+ hdrs = [
+ "usage.h",
+ ],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":usage_internal",
+ "//absl/base:config",
+ "//absl/base:core_headers",
+ "//absl/strings",
+ "//absl/synchronization",
+ ],
+)
+
+cc_library(
+ name = "parse",
+ srcs = ["parse.cc"],
+ hdrs = [
+ "internal/parse.h",
+ "parse.h",
+ ],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":commandlineflag",
+ ":commandlineflag_internal",
+ ":config",
+ ":flag",
+ ":flag_internal",
+ ":private_handle_accessor",
+ ":program_name",
+ ":reflection",
+ ":usage",
+ ":usage_internal",
+ "//absl/base:config",
+ "//absl/base:core_headers",
+ "//absl/strings",
+ "//absl/synchronization",
+ ],
+)
+
+############################################################################
+# Unit tests in alphabetical order.
+
+cc_test(
+ name = "commandlineflag_test",
+ size = "small",
+ srcs = [
+ "commandlineflag_test.cc",
+ ],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":commandlineflag",
+ ":commandlineflag_internal",
+ ":config",
+ ":flag",
+ ":private_handle_accessor",
+ ":reflection",
+ "//absl/memory",
+ "//absl/strings",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "config_test",
+ size = "small",
+ srcs = [
+ "config_test.cc",
+ ],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":config",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "flag_test",
+ size = "small",
+ srcs = [
+ "flag_test.cc",
+ "flag_test_defs.cc",
+ ],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":config",
+ ":flag",
+ ":flag_internal",
+ ":marshalling",
+ ":reflection",
+ "//absl/base:core_headers",
+ "//absl/base:malloc_internal",
+ "//absl/strings",
+ "//absl/time",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_binary(
+ name = "flag_benchmark",
+ testonly = 1,
+ srcs = [
+ "flag_benchmark.cc",
+ ],
+ copts = ABSL_TEST_COPTS,
+ tags = ["benchmark"],
+ visibility = ["//visibility:private"],
+ deps = [
+ ":flag",
+ ":marshalling",
+ ":parse",
+ ":reflection",
+ "//absl/strings",
+ "//absl/time",
+ "//absl/types:optional",
+ "@com_github_google_benchmark//:benchmark_main",
+ ],
+)
+
+cc_test(
+ name = "marshalling_test",
+ size = "small",
+ srcs = [
+ "marshalling_test.cc",
+ ],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":marshalling",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "parse_test",
+ size = "small",
+ srcs = [
+ "parse_test.cc",
+ ],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":flag",
+ ":parse",
+ ":reflection",
+ ":usage_internal",
+ "//absl/base:raw_logging_internal",
+ "//absl/base:scoped_set_env",
+ "//absl/strings",
+ "//absl/types:span",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "path_util_test",
+ size = "small",
+ srcs = [
+ "internal/path_util_test.cc",
+ ],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":path_util",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "program_name_test",
+ size = "small",
+ srcs = [
+ "internal/program_name_test.cc",
+ ],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":program_name",
+ "//absl/strings",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "reflection_test",
+ size = "small",
+ srcs = [
+ "reflection_test.cc",
+ ],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":commandlineflag_internal",
+ ":flag",
+ ":marshalling",
+ ":reflection",
+ ":usage_internal",
+ "//absl/memory",
+ "//absl/strings",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "usage_config_test",
+ size = "small",
+ srcs = [
+ "usage_config_test.cc",
+ ],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":config",
+ ":path_util",
+ ":program_name",
+ "//absl/strings",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "usage_test",
+ size = "small",
+ srcs = [
+ "internal/usage_test.cc",
+ ],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":config",
+ ":flag",
+ ":parse",
+ ":path_util",
+ ":program_name",
+ ":reflection",
+ ":usage",
+ ":usage_internal",
+ "//absl/strings",
+ "@com_google_googletest//:gtest",
+ ],
+)
diff --git a/third_party/abseil/src/absl/flags/CMakeLists.txt b/third_party/abseil/src/absl/flags/CMakeLists.txt
new file mode 100644
index 0000000..e5083d7
--- /dev/null
+++ b/third_party/abseil/src/absl/flags/CMakeLists.txt
@@ -0,0 +1,451 @@
+#
+# Copyright 2019 The Abseil Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+# Internal-only target, do not depend on directly.
+absl_cc_library(
+ NAME
+ flags_path_util
+ HDRS
+ "internal/path_util.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::config
+ absl::strings
+ PUBLIC
+)
+
+# Internal-only target, do not depend on directly.
+absl_cc_library(
+ NAME
+ flags_program_name
+ SRCS
+ "internal/program_name.cc"
+ HDRS
+ "internal/program_name.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::config
+ absl::core_headers
+ absl::flags_path_util
+ absl::strings
+ absl::synchronization
+ PUBLIC
+)
+
+absl_cc_library(
+ NAME
+ flags_config
+ SRCS
+ "usage_config.cc"
+ HDRS
+ "config.h"
+ "usage_config.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::config
+ absl::flags_path_util
+ absl::flags_program_name
+ absl::core_headers
+ absl::strings
+ absl::synchronization
+)
+
+absl_cc_library(
+ NAME
+ flags_marshalling
+ SRCS
+ "marshalling.cc"
+ HDRS
+ "marshalling.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::config
+ absl::core_headers
+ absl::log_severity
+ absl::strings
+ absl::str_format
+)
+
+# Internal-only target, do not depend on directly.
+absl_cc_library(
+ NAME
+ flags_commandlineflag_internal
+ SRCS
+ "internal/commandlineflag.cc"
+ HDRS
+ "internal/commandlineflag.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::config
+ absl::fast_type_id
+)
+
+absl_cc_library(
+ NAME
+ flags_commandlineflag
+ SRCS
+ "commandlineflag.cc"
+ HDRS
+ "commandlineflag.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::config
+ absl::fast_type_id
+ absl::flags_commandlineflag_internal
+ absl::optional
+ absl::strings
+)
+
+# Internal-only target, do not depend on directly.
+absl_cc_library(
+ NAME
+ flags_private_handle_accessor
+ SRCS
+ "internal/private_handle_accessor.cc"
+ HDRS
+ "internal/private_handle_accessor.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::config
+ absl::flags_commandlineflag
+ absl::flags_commandlineflag_internal
+ absl::strings
+)
+
+absl_cc_library(
+ NAME
+ flags_reflection
+ SRCS
+ "reflection.cc"
+ HDRS
+ "reflection.h"
+ "internal/registry.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::config
+ absl::flags_commandlineflag
+ absl::flags_private_handle_accessor
+ absl::flags_config
+ absl::strings
+ absl::synchronization
+ absl::flat_hash_map
+)
+
+# Internal-only target, do not depend on directly.
+absl_cc_library(
+ NAME
+ flags_internal
+ SRCS
+ "internal/flag.cc"
+ HDRS
+ "internal/flag.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::base
+ absl::config
+ absl::flags_commandlineflag
+ absl::flags_commandlineflag_internal
+ absl::flags_config
+ absl::flags_marshalling
+ absl::synchronization
+ absl::meta
+ absl::utility
+ PUBLIC
+)
+
+absl_cc_library(
+ NAME
+ flags
+ SRCS
+ "flag.cc"
+ HDRS
+ "declare.h"
+ "flag.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::config
+ absl::flags_commandlineflag
+ absl::flags_config
+ absl::flags_internal
+ absl::flags_reflection
+ absl::base
+ absl::core_headers
+ absl::strings
+)
+
+# Internal-only target, do not depend on directly.
+absl_cc_library(
+ NAME
+ flags_usage_internal
+ SRCS
+ "internal/usage.cc"
+ HDRS
+ "internal/usage.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::config
+ absl::flags_config
+ absl::flags
+ absl::flags_commandlineflag
+ absl::flags_internal
+ absl::flags_path_util
+ absl::flags_private_handle_accessor
+ absl::flags_program_name
+ absl::flags_reflection
+ absl::strings
+ absl::synchronization
+)
+
+absl_cc_library(
+ NAME
+ flags_usage
+ SRCS
+ "usage.cc"
+ HDRS
+ "usage.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::config
+ absl::core_headers
+ absl::flags_usage_internal
+ absl::strings
+ absl::synchronization
+)
+
+absl_cc_library(
+ NAME
+ flags_parse
+ SRCS
+ "parse.cc"
+ HDRS
+ "internal/parse.h"
+ "parse.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::config
+ absl::core_headers
+ absl::flags_config
+ absl::flags
+ absl::flags_commandlineflag
+ absl::flags_commandlineflag_internal
+ absl::flags_internal
+ absl::flags_private_handle_accessor
+ absl::flags_program_name
+ absl::flags_reflection
+ absl::flags_usage
+ absl::strings
+ absl::synchronization
+)
+
+############################################################################
+# Unit tests in alpahabetical order.
+
+absl_cc_test(
+ NAME
+ flags_commandlineflag_test
+ SRCS
+ "commandlineflag_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::flags
+ absl::flags_commandlineflag
+ absl::flags_commandlineflag_internal
+ absl::flags_config
+ absl::flags_private_handle_accessor
+ absl::flags_reflection
+ absl::memory
+ absl::strings
+ gtest_main
+)
+
+absl_cc_test(
+ NAME
+ flags_config_test
+ SRCS
+ "config_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::flags_config
+ gtest_main
+)
+
+absl_cc_test(
+ NAME
+ flags_flag_test
+ SRCS
+ "flag_test.cc"
+ "flag_test_defs.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::core_headers
+ absl::flags
+ absl::flags_config
+ absl::flags_internal
+ absl::flags_marshalling
+ absl::flags_reflection
+ absl::strings
+ absl::time
+ gtest_main
+)
+
+absl_cc_test(
+ NAME
+ flags_marshalling_test
+ SRCS
+ "marshalling_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::flags_marshalling
+ gtest_main
+)
+
+absl_cc_test(
+ NAME
+ flags_parse_test
+ SRCS
+ "parse_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::flags
+ absl::flags_parse
+ absl::flags_reflection
+ absl::flags_usage_internal
+ absl::raw_logging_internal
+ absl::scoped_set_env
+ absl::span
+ absl::strings
+ gmock_main
+)
+
+absl_cc_test(
+ NAME
+ flags_path_util_test
+ SRCS
+ "internal/path_util_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::flags_path_util
+ gtest_main
+)
+
+absl_cc_test(
+ NAME
+ flags_program_name_test
+ SRCS
+ "internal/program_name_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::flags_program_name
+ absl::strings
+ gtest_main
+)
+
+absl_cc_test(
+ NAME
+ flags_reflection_test
+ SRCS
+ "reflection_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::flags_commandlineflag_internal
+ absl::flags
+ absl::flags_reflection
+ absl::flags_usage
+ absl::memory
+ absl::strings
+ gmock_main
+)
+
+absl_cc_test(
+ NAME
+ flags_usage_config_test
+ SRCS
+ "usage_config_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::flags_config
+ absl::flags_path_util
+ absl::flags_program_name
+ absl::strings
+ gtest_main
+)
+
+absl_cc_test(
+ NAME
+ flags_usage_test
+ SRCS
+ "internal/usage_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::flags_config
+ absl::flags
+ absl::flags_path_util
+ absl::flags_program_name
+ absl::flags_parse
+ absl::flags_reflection
+ absl::flags_usage
+ absl::strings
+ gtest
+)
diff --git a/third_party/abseil/src/absl/flags/commandlineflag.cc b/third_party/abseil/src/absl/flags/commandlineflag.cc
new file mode 100644
index 0000000..9f3b4a5
--- /dev/null
+++ b/third_party/abseil/src/absl/flags/commandlineflag.cc
@@ -0,0 +1,34 @@
+//
+// Copyright 2020 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/flags/commandlineflag.h"
+
+#include <string>
+
+#include "absl/base/config.h"
+#include "absl/flags/internal/commandlineflag.h"
+#include "absl/strings/string_view.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+bool CommandLineFlag::IsRetired() const { return false; }
+bool CommandLineFlag::ParseFrom(absl::string_view value, std::string* error) {
+ return ParseFrom(value, flags_internal::SET_FLAGS_VALUE,
+ flags_internal::kProgrammaticChange, *error);
+}
+
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/flags/commandlineflag.h b/third_party/abseil/src/absl/flags/commandlineflag.h
new file mode 100644
index 0000000..f2fa089
--- /dev/null
+++ b/third_party/abseil/src/absl/flags/commandlineflag.h
@@ -0,0 +1,200 @@
+//
+// Copyright 2020 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: commandlineflag.h
+// -----------------------------------------------------------------------------
+//
+// This header file defines the `CommandLineFlag`, which acts as a type-erased
+// handle for accessing metadata about the Abseil Flag in question.
+//
+// Because an actual Abseil flag is of an unspecified type, you should not
+// manipulate or interact directly with objects of that type. Instead, use the
+// CommandLineFlag type as an intermediary.
+#ifndef ABSL_FLAGS_COMMANDLINEFLAG_H_
+#define ABSL_FLAGS_COMMANDLINEFLAG_H_
+
+#include <memory>
+#include <string>
+
+#include "absl/base/config.h"
+#include "absl/base/internal/fast_type_id.h"
+#include "absl/flags/internal/commandlineflag.h"
+#include "absl/strings/string_view.h"
+#include "absl/types/optional.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace flags_internal {
+class PrivateHandleAccessor;
+} // namespace flags_internal
+
+// CommandLineFlag
+//
+// This type acts as a type-erased handle for an instance of an Abseil Flag and
+// holds reflection information pertaining to that flag. Use CommandLineFlag to
+// access a flag's name, location, help string etc.
+//
+// To obtain an absl::CommandLineFlag, invoke `absl::FindCommandLineFlag()`
+// passing it the flag name string.
+//
+// Example:
+//
+// // Obtain reflection handle for a flag named "flagname".
+// const absl::CommandLineFlag* my_flag_data =
+// absl::FindCommandLineFlag("flagname");
+//
+// // Now you can get flag info from that reflection handle.
+// std::string flag_location = my_flag_data->Filename();
+// ...
+class CommandLineFlag {
+ public:
+ constexpr CommandLineFlag() = default;
+
+ // Not copyable/assignable.
+ CommandLineFlag(const CommandLineFlag&) = delete;
+ CommandLineFlag& operator=(const CommandLineFlag&) = delete;
+
+ // absl::CommandLineFlag::IsOfType()
+ //
+ // Return true iff flag has type T.
+ template <typename T>
+ inline bool IsOfType() const {
+ return TypeId() == base_internal::FastTypeId<T>();
+ }
+
+ // absl::CommandLineFlag::TryGet()
+ //
+ // Attempts to retrieve the flag value. Returns value on success,
+ // absl::nullopt otherwise.
+ template <typename T>
+ absl::optional<T> TryGet() const {
+ if (IsRetired() || !IsOfType<T>()) {
+ return absl::nullopt;
+ }
+
+ // Implementation notes:
+ //
+ // We are wrapping a union around the value of `T` to serve three purposes:
+ //
+ // 1. `U.value` has correct size and alignment for a value of type `T`
+ // 2. The `U.value` constructor is not invoked since U's constructor does
+ // not do it explicitly.
+ // 3. The `U.value` destructor is invoked since U's destructor does it
+ // explicitly. This makes `U` a kind of RAII wrapper around non default
+ // constructible value of T, which is destructed when we leave the
+ // scope. We do need to destroy U.value, which is constructed by
+ // CommandLineFlag::Read even though we left it in a moved-from state
+ // after std::move.
+ //
+ // All of this serves to avoid requiring `T` being default constructible.
+ union U {
+ T value;
+ U() {}
+ ~U() { value.~T(); }
+ };
+ U u;
+
+ Read(&u.value);
+ // allow retired flags to be "read", so we can report invalid access.
+ if (IsRetired()) {
+ return absl::nullopt;
+ }
+ return std::move(u.value);
+ }
+
+ // absl::CommandLineFlag::Name()
+ //
+ // Returns name of this flag.
+ virtual absl::string_view Name() const = 0;
+
+ // absl::CommandLineFlag::Filename()
+ //
+ // Returns name of the file where this flag is defined.
+ virtual std::string Filename() const = 0;
+
+ // absl::CommandLineFlag::Help()
+ //
+ // Returns help message associated with this flag.
+ virtual std::string Help() const = 0;
+
+ // absl::CommandLineFlag::IsRetired()
+ //
+ // Returns true iff this object corresponds to retired flag.
+ virtual bool IsRetired() const;
+
+ // absl::CommandLineFlag::DefaultValue()
+ //
+ // Returns the default value for this flag.
+ virtual std::string DefaultValue() const = 0;
+
+ // absl::CommandLineFlag::CurrentValue()
+ //
+ // Returns the current value for this flag.
+ virtual std::string CurrentValue() const = 0;
+
+ // absl::CommandLineFlag::ParseFrom()
+ //
+ // Sets the value of the flag based on specified string `value`. If the flag
+ // was successfully set to new value, it returns true. Otherwise, sets `error`
+ // to indicate the error, leaves the flag unchanged, and returns false.
+ bool ParseFrom(absl::string_view value, std::string* error);
+
+ protected:
+ ~CommandLineFlag() = default;
+
+ private:
+ friend class flags_internal::PrivateHandleAccessor;
+
+ // Sets the value of the flag based on specified string `value`. If the flag
+ // was successfully set to new value, it returns true. Otherwise, sets `error`
+ // to indicate the error, leaves the flag unchanged, and returns false. There
+ // are three ways to set the flag's value:
+ // * Update the current flag value
+ // * Update the flag's default value
+ // * Update the current flag value if it was never set before
+ // The mode is selected based on `set_mode` parameter.
+ virtual bool ParseFrom(absl::string_view value,
+ flags_internal::FlagSettingMode set_mode,
+ flags_internal::ValueSource source,
+ std::string& error) = 0;
+
+ // Returns id of the flag's value type.
+ virtual flags_internal::FlagFastTypeId TypeId() const = 0;
+
+ // Interface to save flag to some persistent state. Returns current flag state
+ // or nullptr if flag does not support saving and restoring a state.
+ virtual std::unique_ptr<flags_internal::FlagStateInterface> SaveState() = 0;
+
+ // Copy-construct a new value of the flag's type in a memory referenced by
+ // the dst based on the current flag's value.
+ virtual void Read(void* dst) const = 0;
+
+ // To be deleted. Used to return true if flag's current value originated from
+ // command line.
+ virtual bool IsSpecifiedOnCommandLine() const = 0;
+
+ // Validates supplied value usign validator or parseflag routine
+ virtual bool ValidateInputValue(absl::string_view value) const = 0;
+
+ // Checks that flags default value can be converted to string and back to the
+ // flag's value type.
+ virtual void CheckDefaultValueParsingRoundtrip() const = 0;
+};
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_FLAGS_COMMANDLINEFLAG_H_
diff --git a/third_party/abseil/src/absl/flags/commandlineflag_test.cc b/third_party/abseil/src/absl/flags/commandlineflag_test.cc
new file mode 100644
index 0000000..585db4b
--- /dev/null
+++ b/third_party/abseil/src/absl/flags/commandlineflag_test.cc
@@ -0,0 +1,231 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/flags/commandlineflag.h"
+
+#include <memory>
+#include <string>
+
+#include "gtest/gtest.h"
+#include "absl/flags/flag.h"
+#include "absl/flags/internal/commandlineflag.h"
+#include "absl/flags/internal/private_handle_accessor.h"
+#include "absl/flags/reflection.h"
+#include "absl/flags/usage_config.h"
+#include "absl/memory/memory.h"
+#include "absl/strings/match.h"
+#include "absl/strings/str_cat.h"
+#include "absl/strings/string_view.h"
+
+ABSL_FLAG(int, int_flag, 201, "int_flag help");
+ABSL_FLAG(std::string, string_flag, "dflt",
+ absl::StrCat("string_flag", " help"));
+ABSL_RETIRED_FLAG(bool, bool_retired_flag, false, "bool_retired_flag help");
+
+// These are only used to test default values.
+ABSL_FLAG(int, int_flag2, 201, "");
+ABSL_FLAG(std::string, string_flag2, "dflt", "");
+
+namespace {
+
+namespace flags = absl::flags_internal;
+
+class CommandLineFlagTest : public testing::Test {
+ protected:
+ static void SetUpTestSuite() {
+ // Install a function to normalize filenames before this test is run.
+ absl::FlagsUsageConfig default_config;
+ default_config.normalize_filename = &CommandLineFlagTest::NormalizeFileName;
+ absl::SetFlagsUsageConfig(default_config);
+ }
+
+ void SetUp() override { flag_saver_ = absl::make_unique<absl::FlagSaver>(); }
+ void TearDown() override { flag_saver_.reset(); }
+
+ private:
+ static std::string NormalizeFileName(absl::string_view fname) {
+#ifdef _WIN32
+ std::string normalized(fname);
+ std::replace(normalized.begin(), normalized.end(), '\\', '/');
+ fname = normalized;
+#endif
+ return std::string(fname);
+ }
+
+ std::unique_ptr<absl::FlagSaver> flag_saver_;
+};
+
+TEST_F(CommandLineFlagTest, TestAttributesAccessMethods) {
+ auto* flag_01 = absl::FindCommandLineFlag("int_flag");
+
+ ASSERT_TRUE(flag_01);
+ EXPECT_EQ(flag_01->Name(), "int_flag");
+ EXPECT_EQ(flag_01->Help(), "int_flag help");
+ EXPECT_TRUE(!flag_01->IsRetired());
+ EXPECT_TRUE(flag_01->IsOfType<int>());
+ EXPECT_TRUE(!flag_01->IsOfType<bool>());
+ EXPECT_TRUE(!flag_01->IsOfType<std::string>());
+ EXPECT_TRUE(absl::EndsWith(flag_01->Filename(),
+ "absl/flags/commandlineflag_test.cc"))
+ << flag_01->Filename();
+
+ auto* flag_02 = absl::FindCommandLineFlag("string_flag");
+
+ ASSERT_TRUE(flag_02);
+ EXPECT_EQ(flag_02->Name(), "string_flag");
+ EXPECT_EQ(flag_02->Help(), "string_flag help");
+ EXPECT_TRUE(!flag_02->IsRetired());
+ EXPECT_TRUE(flag_02->IsOfType<std::string>());
+ EXPECT_TRUE(!flag_02->IsOfType<bool>());
+ EXPECT_TRUE(!flag_02->IsOfType<int>());
+ EXPECT_TRUE(absl::EndsWith(flag_02->Filename(),
+ "absl/flags/commandlineflag_test.cc"))
+ << flag_02->Filename();
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(CommandLineFlagTest, TestValueAccessMethods) {
+ absl::SetFlag(&FLAGS_int_flag2, 301);
+ auto* flag_01 = absl::FindCommandLineFlag("int_flag2");
+
+ ASSERT_TRUE(flag_01);
+ EXPECT_EQ(flag_01->CurrentValue(), "301");
+ EXPECT_EQ(flag_01->DefaultValue(), "201");
+
+ absl::SetFlag(&FLAGS_string_flag2, "new_str_value");
+ auto* flag_02 = absl::FindCommandLineFlag("string_flag2");
+
+ ASSERT_TRUE(flag_02);
+ EXPECT_EQ(flag_02->CurrentValue(), "new_str_value");
+ EXPECT_EQ(flag_02->DefaultValue(), "dflt");
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(CommandLineFlagTest, TestParseFromCurrentValue) {
+ std::string err;
+
+ auto* flag_01 = absl::FindCommandLineFlag("int_flag");
+ EXPECT_FALSE(
+ flags::PrivateHandleAccessor::IsSpecifiedOnCommandLine(*flag_01));
+
+ EXPECT_TRUE(flags::PrivateHandleAccessor::ParseFrom(
+ *flag_01, "11", flags::SET_FLAGS_VALUE, flags::kProgrammaticChange, err));
+ EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), 11);
+ EXPECT_FALSE(
+ flags::PrivateHandleAccessor::IsSpecifiedOnCommandLine(*flag_01));
+
+ EXPECT_TRUE(flags::PrivateHandleAccessor::ParseFrom(
+ *flag_01, "-123", flags::SET_FLAGS_VALUE, flags::kProgrammaticChange,
+ err));
+ EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), -123);
+ EXPECT_FALSE(
+ flags::PrivateHandleAccessor::IsSpecifiedOnCommandLine(*flag_01));
+
+ EXPECT_TRUE(!flags::PrivateHandleAccessor::ParseFrom(
+ *flag_01, "xyz", flags::SET_FLAGS_VALUE, flags::kProgrammaticChange,
+ err));
+ EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), -123);
+ EXPECT_EQ(err, "Illegal value 'xyz' specified for flag 'int_flag'");
+ EXPECT_FALSE(
+ flags::PrivateHandleAccessor::IsSpecifiedOnCommandLine(*flag_01));
+
+ EXPECT_TRUE(!flags::PrivateHandleAccessor::ParseFrom(
+ *flag_01, "A1", flags::SET_FLAGS_VALUE, flags::kProgrammaticChange, err));
+ EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), -123);
+ EXPECT_EQ(err, "Illegal value 'A1' specified for flag 'int_flag'");
+ EXPECT_FALSE(
+ flags::PrivateHandleAccessor::IsSpecifiedOnCommandLine(*flag_01));
+
+ EXPECT_TRUE(flags::PrivateHandleAccessor::ParseFrom(
+ *flag_01, "0x10", flags::SET_FLAGS_VALUE, flags::kProgrammaticChange,
+ err));
+ EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), 16);
+ EXPECT_FALSE(
+ flags::PrivateHandleAccessor::IsSpecifiedOnCommandLine(*flag_01));
+
+ EXPECT_TRUE(flags::PrivateHandleAccessor::ParseFrom(
+ *flag_01, "011", flags::SET_FLAGS_VALUE, flags::kCommandLine, err));
+ EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), 11);
+ EXPECT_TRUE(flags::PrivateHandleAccessor::IsSpecifiedOnCommandLine(*flag_01));
+
+ EXPECT_TRUE(!flags::PrivateHandleAccessor::ParseFrom(
+ *flag_01, "", flags::SET_FLAGS_VALUE, flags::kProgrammaticChange, err));
+ EXPECT_EQ(err, "Illegal value '' specified for flag 'int_flag'");
+
+ auto* flag_02 = absl::FindCommandLineFlag("string_flag");
+ EXPECT_TRUE(flags::PrivateHandleAccessor::ParseFrom(
+ *flag_02, "xyz", flags::SET_FLAGS_VALUE, flags::kProgrammaticChange,
+ err));
+ EXPECT_EQ(absl::GetFlag(FLAGS_string_flag), "xyz");
+
+ EXPECT_TRUE(flags::PrivateHandleAccessor::ParseFrom(
+ *flag_02, "", flags::SET_FLAGS_VALUE, flags::kProgrammaticChange, err));
+ EXPECT_EQ(absl::GetFlag(FLAGS_string_flag), "");
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(CommandLineFlagTest, TestParseFromDefaultValue) {
+ std::string err;
+
+ auto* flag_01 = absl::FindCommandLineFlag("int_flag");
+
+ EXPECT_TRUE(flags::PrivateHandleAccessor::ParseFrom(
+ *flag_01, "111", flags::SET_FLAGS_DEFAULT, flags::kProgrammaticChange,
+ err));
+ EXPECT_EQ(flag_01->DefaultValue(), "111");
+
+ auto* flag_02 = absl::FindCommandLineFlag("string_flag");
+
+ EXPECT_TRUE(flags::PrivateHandleAccessor::ParseFrom(
+ *flag_02, "abc", flags::SET_FLAGS_DEFAULT, flags::kProgrammaticChange,
+ err));
+ EXPECT_EQ(flag_02->DefaultValue(), "abc");
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(CommandLineFlagTest, TestParseFromIfDefault) {
+ std::string err;
+
+ auto* flag_01 = absl::FindCommandLineFlag("int_flag");
+
+ EXPECT_TRUE(flags::PrivateHandleAccessor::ParseFrom(
+ *flag_01, "22", flags::SET_FLAG_IF_DEFAULT, flags::kProgrammaticChange,
+ err))
+ << err;
+ EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), 22);
+
+ EXPECT_TRUE(flags::PrivateHandleAccessor::ParseFrom(
+ *flag_01, "33", flags::SET_FLAG_IF_DEFAULT, flags::kProgrammaticChange,
+ err));
+ EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), 22);
+ // EXPECT_EQ(err, "ERROR: int_flag is already set to 22");
+
+ // Reset back to default value
+ EXPECT_TRUE(flags::PrivateHandleAccessor::ParseFrom(
+ *flag_01, "201", flags::SET_FLAGS_VALUE, flags::kProgrammaticChange,
+ err));
+
+ EXPECT_TRUE(flags::PrivateHandleAccessor::ParseFrom(
+ *flag_01, "33", flags::SET_FLAG_IF_DEFAULT, flags::kProgrammaticChange,
+ err));
+ EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), 201);
+ // EXPECT_EQ(err, "ERROR: int_flag is already set to 201");
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/flags/config.h b/third_party/abseil/src/absl/flags/config.h
new file mode 100644
index 0000000..813a925
--- /dev/null
+++ b/third_party/abseil/src/absl/flags/config.h
@@ -0,0 +1,87 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_FLAGS_CONFIG_H_
+#define ABSL_FLAGS_CONFIG_H_
+
+// Determine if we should strip string literals from the Flag objects.
+// By default we strip string literals on mobile platforms.
+#if !defined(ABSL_FLAGS_STRIP_NAMES)
+
+#if defined(__ANDROID__)
+#define ABSL_FLAGS_STRIP_NAMES 1
+
+#elif defined(__APPLE__)
+#include <TargetConditionals.h>
+#if defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE
+#define ABSL_FLAGS_STRIP_NAMES 1
+#elif defined(TARGET_OS_EMBEDDED) && TARGET_OS_EMBEDDED
+#define ABSL_FLAGS_STRIP_NAMES 1
+#endif // TARGET_OS_*
+#endif
+
+#endif // !defined(ABSL_FLAGS_STRIP_NAMES)
+
+#if !defined(ABSL_FLAGS_STRIP_NAMES)
+// If ABSL_FLAGS_STRIP_NAMES wasn't set on the command line or above,
+// the default is not to strip.
+#define ABSL_FLAGS_STRIP_NAMES 0
+#endif
+
+#if !defined(ABSL_FLAGS_STRIP_HELP)
+// By default, if we strip names, we also strip help.
+#define ABSL_FLAGS_STRIP_HELP ABSL_FLAGS_STRIP_NAMES
+#endif
+
+// ABSL_FLAGS_INTERNAL_ATOMIC_DOUBLE_WORD macro is used for using atomics with
+// double words, e.g. absl::Duration.
+// For reasons in bug https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80878, modern
+// versions of GCC do not support cmpxchg16b instruction in standard atomics.
+#ifdef ABSL_FLAGS_INTERNAL_ATOMIC_DOUBLE_WORD
+#error "ABSL_FLAGS_INTERNAL_ATOMIC_DOUBLE_WORD should not be defined."
+#elif defined(__clang__) && defined(__x86_64__) && \
+ defined(__GCC_HAVE_SYNC_COMPARE_AND_SWAP_16)
+#define ABSL_FLAGS_INTERNAL_ATOMIC_DOUBLE_WORD 1
+#endif
+
+// ABSL_FLAGS_INTERNAL_HAS_RTTI macro is used for selecting if we can use RTTI
+// for flag type identification.
+#ifdef ABSL_FLAGS_INTERNAL_HAS_RTTI
+#error ABSL_FLAGS_INTERNAL_HAS_RTTI cannot be directly set
+#elif !defined(__GNUC__) || defined(__GXX_RTTI)
+#define ABSL_FLAGS_INTERNAL_HAS_RTTI 1
+#endif // !defined(__GNUC__) || defined(__GXX_RTTI)
+
+// These macros represent the "source of truth" for the list of supported
+// built-in types.
+#define ABSL_FLAGS_INTERNAL_BUILTIN_TYPES(A) \
+ A(bool, bool) \
+ A(short, short) \
+ A(unsigned short, unsigned_short) \
+ A(int, int) \
+ A(unsigned int, unsigned_int) \
+ A(long, long) \
+ A(unsigned long, unsigned_long) \
+ A(long long, long_long) \
+ A(unsigned long long, unsigned_long_long) \
+ A(double, double) \
+ A(float, float)
+
+#define ABSL_FLAGS_INTERNAL_SUPPORTED_TYPES(A) \
+ ABSL_FLAGS_INTERNAL_BUILTIN_TYPES(A) \
+ A(std::string, std_string) \
+ A(std::vector<std::string>, std_vector_of_string)
+
+#endif // ABSL_FLAGS_CONFIG_H_
diff --git a/third_party/abseil/src/absl/flags/config_test.cc b/third_party/abseil/src/absl/flags/config_test.cc
new file mode 100644
index 0000000..6389986
--- /dev/null
+++ b/third_party/abseil/src/absl/flags/config_test.cc
@@ -0,0 +1,61 @@
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/flags/config.h"
+
+#ifdef __APPLE__
+#include <TargetConditionals.h>
+#endif
+
+#include "gtest/gtest.h"
+
+#ifndef ABSL_FLAGS_STRIP_NAMES
+#error ABSL_FLAGS_STRIP_NAMES is not defined
+#endif
+
+#ifndef ABSL_FLAGS_STRIP_HELP
+#error ABSL_FLAGS_STRIP_HELP is not defined
+#endif
+
+namespace {
+
+// Test that ABSL_FLAGS_STRIP_NAMES and ABSL_FLAGS_STRIP_HELP are configured how
+// we expect them to be configured by default. If you override this
+// configuration, this test will fail, but the code should still be safe to use.
+TEST(FlagsConfigTest, Test) {
+#if defined(__ANDROID__)
+ EXPECT_EQ(ABSL_FLAGS_STRIP_NAMES, 1);
+ EXPECT_EQ(ABSL_FLAGS_STRIP_HELP, 1);
+#elif defined(__myriad2__)
+ EXPECT_EQ(ABSL_FLAGS_STRIP_NAMES, 0);
+ EXPECT_EQ(ABSL_FLAGS_STRIP_HELP, 0);
+#elif defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE
+ EXPECT_EQ(ABSL_FLAGS_STRIP_NAMES, 1);
+ EXPECT_EQ(ABSL_FLAGS_STRIP_HELP, 1);
+#elif defined(TARGET_OS_EMBEDDED) && TARGET_OS_EMBEDDED
+ EXPECT_EQ(ABSL_FLAGS_STRIP_NAMES, 1);
+ EXPECT_EQ(ABSL_FLAGS_STRIP_HELP, 1);
+#elif defined(__APPLE__)
+ EXPECT_EQ(ABSL_FLAGS_STRIP_NAMES, 0);
+ EXPECT_EQ(ABSL_FLAGS_STRIP_HELP, 0);
+#elif defined(_WIN32)
+ EXPECT_EQ(ABSL_FLAGS_STRIP_NAMES, 0);
+ EXPECT_EQ(ABSL_FLAGS_STRIP_HELP, 0);
+#elif defined(__linux__)
+ EXPECT_EQ(ABSL_FLAGS_STRIP_NAMES, 0);
+ EXPECT_EQ(ABSL_FLAGS_STRIP_HELP, 0);
+#endif
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/flags/declare.h b/third_party/abseil/src/absl/flags/declare.h
new file mode 100644
index 0000000..b9794d8
--- /dev/null
+++ b/third_party/abseil/src/absl/flags/declare.h
@@ -0,0 +1,65 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: declare.h
+// -----------------------------------------------------------------------------
+//
+// This file defines the ABSL_DECLARE_FLAG macro, allowing you to declare an
+// `absl::Flag` for use within a translation unit. You should place this
+// declaration within the header file associated with the .cc file that defines
+// and owns the `Flag`.
+
+#ifndef ABSL_FLAGS_DECLARE_H_
+#define ABSL_FLAGS_DECLARE_H_
+
+#include "absl/base/config.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace flags_internal {
+
+// absl::Flag<T> represents a flag of type 'T' created by ABSL_FLAG.
+template <typename T>
+class Flag;
+
+} // namespace flags_internal
+
+// Flag
+//
+// Forward declaration of the `absl::Flag` type for use in defining the macro.
+#if defined(_MSC_VER) && !defined(__clang__)
+template <typename T>
+class Flag;
+#else
+template <typename T>
+using Flag = flags_internal::Flag<T>;
+#endif
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+// ABSL_DECLARE_FLAG()
+//
+// This macro is a convenience for declaring use of an `absl::Flag` within a
+// translation unit. This macro should be used within a header file to
+// declare usage of the flag within any .cc file including that header file.
+//
+// The ABSL_DECLARE_FLAG(type, name) macro expands to:
+//
+// extern absl::Flag<type> FLAGS_name;
+#define ABSL_DECLARE_FLAG(type, name) extern ::absl::Flag<type> FLAGS_##name
+
+#endif // ABSL_FLAGS_DECLARE_H_
diff --git a/third_party/abseil/src/absl/flags/flag.cc b/third_party/abseil/src/absl/flags/flag.cc
new file mode 100644
index 0000000..531df12
--- /dev/null
+++ b/third_party/abseil/src/absl/flags/flag.cc
@@ -0,0 +1,38 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/flags/flag.h"
+
+#include "absl/base/config.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+// This global mutex protects on-demand construction of flag objects in MSVC
+// builds.
+#if defined(_MSC_VER) && !defined(__clang__)
+
+namespace flags_internal {
+
+ABSL_CONST_INIT static absl::Mutex construction_guard(absl::kConstInit);
+
+absl::Mutex* GetGlobalConstructionGuard() { return &construction_guard; }
+
+} // namespace flags_internal
+
+#endif
+
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/flags/flag.h b/third_party/abseil/src/absl/flags/flag.h
new file mode 100644
index 0000000..a9cb2b7
--- /dev/null
+++ b/third_party/abseil/src/absl/flags/flag.h
@@ -0,0 +1,396 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: flag.h
+// -----------------------------------------------------------------------------
+//
+// This header file defines the `absl::Flag<T>` type for holding command-line
+// flag data, and abstractions to create, get and set such flag data.
+//
+// It is important to note that this type is **unspecified** (an implementation
+// detail) and you do not construct or manipulate actual `absl::Flag<T>`
+// instances. Instead, you define and declare flags using the
+// `ABSL_FLAG()` and `ABSL_DECLARE_FLAG()` macros, and get and set flag values
+// using the `absl::GetFlag()` and `absl::SetFlag()` functions.
+
+#ifndef ABSL_FLAGS_FLAG_H_
+#define ABSL_FLAGS_FLAG_H_
+
+#include <string>
+#include <type_traits>
+
+#include "absl/base/attributes.h"
+#include "absl/base/config.h"
+#include "absl/base/optimization.h"
+#include "absl/flags/config.h"
+#include "absl/flags/internal/flag.h"
+#include "absl/flags/internal/registry.h"
+#include "absl/strings/string_view.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+// Flag
+//
+// An `absl::Flag` holds a command-line flag value, providing a runtime
+// parameter to a binary. Such flags should be defined in the global namespace
+// and (preferably) in the module containing the binary's `main()` function.
+//
+// You should not construct and cannot use the `absl::Flag` type directly;
+// instead, you should declare flags using the `ABSL_DECLARE_FLAG()` macro
+// within a header file, and define your flag using `ABSL_FLAG()` within your
+// header's associated `.cc` file. Such flags will be named `FLAGS_name`.
+//
+// Example:
+//
+// .h file
+//
+// // Declares usage of a flag named "FLAGS_count"
+// ABSL_DECLARE_FLAG(int, count);
+//
+// .cc file
+//
+// // Defines a flag named "FLAGS_count" with a default `int` value of 0.
+// ABSL_FLAG(int, count, 0, "Count of items to process");
+//
+// No public methods of `absl::Flag<T>` are part of the Abseil Flags API.
+#if !defined(_MSC_VER) || defined(__clang__)
+template <typename T>
+using Flag = flags_internal::Flag<T>;
+#else
+// MSVC debug builds do not implement initialization with constexpr constructors
+// correctly. To work around this we add a level of indirection, so that the
+// class `absl::Flag` contains an `internal::Flag*` (instead of being an alias
+// to that class) and dynamically allocates an instance when necessary. We also
+// forward all calls to internal::Flag methods via trampoline methods. In this
+// setup the `absl::Flag` class does not have constructor and virtual methods,
+// all the data members are public and thus MSVC is able to initialize it at
+// link time. To deal with multiple threads accessing the flag for the first
+// time concurrently we use an atomic boolean indicating if flag object is
+// initialized. We also employ the double-checked locking pattern where the
+// second level of protection is a global Mutex, so if two threads attempt to
+// construct the flag concurrently only one wins.
+// This solution is based on a recomendation here:
+// https://developercommunity.visualstudio.com/content/problem/336946/class-with-constexpr-constructor-not-using-static.html?childToView=648454#comment-648454
+
+namespace flags_internal {
+absl::Mutex* GetGlobalConstructionGuard();
+} // namespace flags_internal
+
+template <typename T>
+class Flag {
+ public:
+ // No constructor and destructor to ensure this is an aggregate type.
+ // Visual Studio 2015 still requires the constructor for class to be
+ // constexpr initializable.
+#if _MSC_VER <= 1900
+ constexpr Flag(const char* name, const char* filename,
+ const flags_internal::HelpGenFunc help_gen,
+ const flags_internal::FlagDfltGenFunc default_value_gen)
+ : name_(name),
+ filename_(filename),
+ help_gen_(help_gen),
+ default_value_gen_(default_value_gen),
+ inited_(false),
+ impl_(nullptr) {}
+#endif
+
+ flags_internal::Flag<T>& GetImpl() const {
+ if (!inited_.load(std::memory_order_acquire)) {
+ absl::MutexLock l(flags_internal::GetGlobalConstructionGuard());
+
+ if (inited_.load(std::memory_order_acquire)) {
+ return *impl_;
+ }
+
+ impl_ = new flags_internal::Flag<T>(
+ name_, filename_,
+ {flags_internal::FlagHelpMsg(help_gen_),
+ flags_internal::FlagHelpKind::kGenFunc},
+ {flags_internal::FlagDefaultSrc(default_value_gen_),
+ flags_internal::FlagDefaultKind::kGenFunc});
+ inited_.store(true, std::memory_order_release);
+ }
+
+ return *impl_;
+ }
+
+ // Public methods of `absl::Flag<T>` are NOT part of the Abseil Flags API.
+ // See https://abseil.io/docs/cpp/guides/flags
+ bool IsRetired() const { return GetImpl().IsRetired(); }
+ absl::string_view Name() const { return GetImpl().Name(); }
+ std::string Help() const { return GetImpl().Help(); }
+ bool IsModified() const { return GetImpl().IsModified(); }
+ bool IsSpecifiedOnCommandLine() const {
+ return GetImpl().IsSpecifiedOnCommandLine();
+ }
+ std::string Filename() const { return GetImpl().Filename(); }
+ std::string DefaultValue() const { return GetImpl().DefaultValue(); }
+ std::string CurrentValue() const { return GetImpl().CurrentValue(); }
+ template <typename U>
+ inline bool IsOfType() const {
+ return GetImpl().template IsOfType<U>();
+ }
+ T Get() const {
+ return flags_internal::FlagImplPeer::InvokeGet<T>(GetImpl());
+ }
+ void Set(const T& v) {
+ flags_internal::FlagImplPeer::InvokeSet(GetImpl(), v);
+ }
+ void InvokeCallback() { GetImpl().InvokeCallback(); }
+
+ const CommandLineFlag& Reflect() const {
+ return flags_internal::FlagImplPeer::InvokeReflect(GetImpl());
+ }
+
+ // The data members are logically private, but they need to be public for
+ // this to be an aggregate type.
+ const char* name_;
+ const char* filename_;
+ const flags_internal::HelpGenFunc help_gen_;
+ const flags_internal::FlagDfltGenFunc default_value_gen_;
+
+ mutable std::atomic<bool> inited_;
+ mutable flags_internal::Flag<T>* impl_;
+};
+#endif
+
+// GetFlag()
+//
+// Returns the value (of type `T`) of an `absl::Flag<T>` instance, by value. Do
+// not construct an `absl::Flag<T>` directly and call `absl::GetFlag()`;
+// instead, refer to flag's constructed variable name (e.g. `FLAGS_name`).
+// Because this function returns by value and not by reference, it is
+// thread-safe, but note that the operation may be expensive; as a result, avoid
+// `absl::GetFlag()` within any tight loops.
+//
+// Example:
+//
+// // FLAGS_count is a Flag of type `int`
+// int my_count = absl::GetFlag(FLAGS_count);
+//
+// // FLAGS_firstname is a Flag of type `std::string`
+// std::string first_name = absl::GetFlag(FLAGS_firstname);
+template <typename T>
+ABSL_MUST_USE_RESULT T GetFlag(const absl::Flag<T>& flag) {
+ return flags_internal::FlagImplPeer::InvokeGet<T>(flag);
+}
+
+// SetFlag()
+//
+// Sets the value of an `absl::Flag` to the value `v`. Do not construct an
+// `absl::Flag<T>` directly and call `absl::SetFlag()`; instead, use the
+// flag's variable name (e.g. `FLAGS_name`). This function is
+// thread-safe, but is potentially expensive. Avoid setting flags in general,
+// but especially within performance-critical code.
+template <typename T>
+void SetFlag(absl::Flag<T>* flag, const T& v) {
+ flags_internal::FlagImplPeer::InvokeSet(*flag, v);
+}
+
+// Overload of `SetFlag()` to allow callers to pass in a value that is
+// convertible to `T`. E.g., use this overload to pass a "const char*" when `T`
+// is `std::string`.
+template <typename T, typename V>
+void SetFlag(absl::Flag<T>* flag, const V& v) {
+ T value(v);
+ flags_internal::FlagImplPeer::InvokeSet(*flag, value);
+}
+
+// GetFlagReflectionHandle()
+//
+// Returns the reflection handle corresponding to specified Abseil Flag
+// instance. Use this handle to access flag's reflection information, like name,
+// location, default value etc.
+//
+// Example:
+//
+// std::string = absl::GetFlagReflectionHandle(FLAGS_count).DefaultValue();
+
+template <typename T>
+const CommandLineFlag& GetFlagReflectionHandle(const absl::Flag<T>& f) {
+ return flags_internal::FlagImplPeer::InvokeReflect(f);
+}
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+
+// ABSL_FLAG()
+//
+// This macro defines an `absl::Flag<T>` instance of a specified type `T`:
+//
+// ABSL_FLAG(T, name, default_value, help);
+//
+// where:
+//
+// * `T` is a supported flag type (see the list of types in `marshalling.h`),
+// * `name` designates the name of the flag (as a global variable
+// `FLAGS_name`),
+// * `default_value` is an expression holding the default value for this flag
+// (which must be implicitly convertible to `T`),
+// * `help` is the help text, which can also be an expression.
+//
+// This macro expands to a flag named 'FLAGS_name' of type 'T':
+//
+// absl::Flag<T> FLAGS_name = ...;
+//
+// Note that all such instances are created as global variables.
+//
+// For `ABSL_FLAG()` values that you wish to expose to other translation units,
+// it is recommended to define those flags within the `.cc` file associated with
+// the header where the flag is declared.
+//
+// Note: do not construct objects of type `absl::Flag<T>` directly. Only use the
+// `ABSL_FLAG()` macro for such construction.
+#define ABSL_FLAG(Type, name, default_value, help) \
+ ABSL_FLAG_IMPL(Type, name, default_value, help)
+
+// ABSL_FLAG().OnUpdate()
+//
+// Defines a flag of type `T` with a callback attached:
+//
+// ABSL_FLAG(T, name, default_value, help).OnUpdate(callback);
+//
+// After any setting of the flag value, the callback will be called at least
+// once. A rapid sequence of changes may be merged together into the same
+// callback. No concurrent calls to the callback will be made for the same
+// flag. Callbacks are allowed to read the current value of the flag but must
+// not mutate that flag.
+//
+// The update mechanism guarantees "eventual consistency"; if the callback
+// derives an auxiliary data structure from the flag value, it is guaranteed
+// that eventually the flag value and the derived data structure will be
+// consistent.
+//
+// Note: ABSL_FLAG.OnUpdate() does not have a public definition. Hence, this
+// comment serves as its API documentation.
+
+
+// -----------------------------------------------------------------------------
+// Implementation details below this section
+// -----------------------------------------------------------------------------
+
+// ABSL_FLAG_IMPL macro definition conditional on ABSL_FLAGS_STRIP_NAMES
+#if !defined(_MSC_VER) || defined(__clang__)
+#define ABSL_FLAG_IMPL_FLAG_PTR(flag) flag
+#define ABSL_FLAG_IMPL_HELP_ARG(name) \
+ absl::flags_internal::HelpArg<AbslFlagHelpGenFor##name>( \
+ FLAGS_help_storage_##name)
+#define ABSL_FLAG_IMPL_DEFAULT_ARG(Type, name) \
+ absl::flags_internal::DefaultArg<Type, AbslFlagDefaultGenFor##name>(0)
+#else
+#define ABSL_FLAG_IMPL_FLAG_PTR(flag) flag.GetImpl()
+#define ABSL_FLAG_IMPL_HELP_ARG(name) &AbslFlagHelpGenFor##name::NonConst
+#define ABSL_FLAG_IMPL_DEFAULT_ARG(Type, name) &AbslFlagDefaultGenFor##name::Gen
+#endif
+
+#if ABSL_FLAGS_STRIP_NAMES
+#define ABSL_FLAG_IMPL_FLAGNAME(txt) ""
+#define ABSL_FLAG_IMPL_FILENAME() ""
+#define ABSL_FLAG_IMPL_REGISTRAR(T, flag) \
+ absl::flags_internal::FlagRegistrar<T, false>(ABSL_FLAG_IMPL_FLAG_PTR(flag))
+#else
+#define ABSL_FLAG_IMPL_FLAGNAME(txt) txt
+#define ABSL_FLAG_IMPL_FILENAME() __FILE__
+#define ABSL_FLAG_IMPL_REGISTRAR(T, flag) \
+ absl::flags_internal::FlagRegistrar<T, true>(ABSL_FLAG_IMPL_FLAG_PTR(flag))
+#endif
+
+// ABSL_FLAG_IMPL macro definition conditional on ABSL_FLAGS_STRIP_HELP
+
+#if ABSL_FLAGS_STRIP_HELP
+#define ABSL_FLAG_IMPL_FLAGHELP(txt) absl::flags_internal::kStrippedFlagHelp
+#else
+#define ABSL_FLAG_IMPL_FLAGHELP(txt) txt
+#endif
+
+// AbslFlagHelpGenFor##name is used to encapsulate both immediate (method Const)
+// and lazy (method NonConst) evaluation of help message expression. We choose
+// between the two via the call to HelpArg in absl::Flag instantiation below.
+// If help message expression is constexpr evaluable compiler will optimize
+// away this whole struct.
+// TODO(rogeeff): place these generated structs into local namespace and apply
+// ABSL_INTERNAL_UNIQUE_SHORT_NAME.
+// TODO(rogeeff): Apply __attribute__((nodebug)) to FLAGS_help_storage_##name
+#define ABSL_FLAG_IMPL_DECLARE_HELP_WRAPPER(name, txt) \
+ struct AbslFlagHelpGenFor##name { \
+ /* The expression is run in the caller as part of the */ \
+ /* default value argument. That keeps temporaries alive */ \
+ /* long enough for NonConst to work correctly. */ \
+ static constexpr absl::string_view Value( \
+ absl::string_view v = ABSL_FLAG_IMPL_FLAGHELP(txt)) { \
+ return v; \
+ } \
+ static std::string NonConst() { return std::string(Value()); } \
+ }; \
+ constexpr auto FLAGS_help_storage_##name ABSL_INTERNAL_UNIQUE_SMALL_NAME() \
+ ABSL_ATTRIBUTE_SECTION_VARIABLE(flags_help_cold) = \
+ absl::flags_internal::HelpStringAsArray<AbslFlagHelpGenFor##name>( \
+ 0);
+
+#define ABSL_FLAG_IMPL_DECLARE_DEF_VAL_WRAPPER(name, Type, default_value) \
+ struct AbslFlagDefaultGenFor##name { \
+ Type value = absl::flags_internal::InitDefaultValue<Type>(default_value); \
+ static void Gen(void* p) { \
+ new (p) Type(AbslFlagDefaultGenFor##name{}.value); \
+ } \
+ };
+
+// ABSL_FLAG_IMPL
+//
+// Note: Name of registrar object is not arbitrary. It is used to "grab"
+// global name for FLAGS_no<flag_name> symbol, thus preventing the possibility
+// of defining two flags with names foo and nofoo.
+#define ABSL_FLAG_IMPL(Type, name, default_value, help) \
+ namespace absl /* block flags in namespaces */ {} \
+ ABSL_FLAG_IMPL_DECLARE_DEF_VAL_WRAPPER(name, Type, default_value) \
+ ABSL_FLAG_IMPL_DECLARE_HELP_WRAPPER(name, help) \
+ ABSL_CONST_INIT absl::Flag<Type> FLAGS_##name{ \
+ ABSL_FLAG_IMPL_FLAGNAME(#name), ABSL_FLAG_IMPL_FILENAME(), \
+ ABSL_FLAG_IMPL_HELP_ARG(name), ABSL_FLAG_IMPL_DEFAULT_ARG(Type, name)}; \
+ extern absl::flags_internal::FlagRegistrarEmpty FLAGS_no##name; \
+ absl::flags_internal::FlagRegistrarEmpty FLAGS_no##name = \
+ ABSL_FLAG_IMPL_REGISTRAR(Type, FLAGS_##name)
+
+// ABSL_RETIRED_FLAG
+//
+// Designates the flag (which is usually pre-existing) as "retired." A retired
+// flag is a flag that is now unused by the program, but may still be passed on
+// the command line, usually by production scripts. A retired flag is ignored
+// and code can't access it at runtime.
+//
+// This macro registers a retired flag with given name and type, with a name
+// identical to the name of the original flag you are retiring. The retired
+// flag's type can change over time, so that you can retire code to support a
+// custom flag type.
+//
+// This macro has the same signature as `ABSL_FLAG`. To retire a flag, simply
+// replace an `ABSL_FLAG` definition with `ABSL_RETIRED_FLAG`, leaving the
+// arguments unchanged (unless of course you actually want to retire the flag
+// type at this time as well).
+//
+// `default_value` is only used as a double check on the type. `explanation` is
+// unused.
+// TODO(rogeeff): replace RETIRED_FLAGS with FLAGS once forward declarations of
+// retired flags are cleaned up.
+#define ABSL_RETIRED_FLAG(type, name, default_value, explanation) \
+ static absl::flags_internal::RetiredFlag<type> RETIRED_FLAGS_##name; \
+ ABSL_ATTRIBUTE_UNUSED static const auto RETIRED_FLAGS_REG_##name = \
+ (RETIRED_FLAGS_##name.Retire(#name), \
+ ::absl::flags_internal::FlagRegistrarEmpty{})
+
+#endif // ABSL_FLAGS_FLAG_H_
diff --git a/third_party/abseil/src/absl/flags/flag_benchmark.cc b/third_party/abseil/src/absl/flags/flag_benchmark.cc
new file mode 100644
index 0000000..9982b60
--- /dev/null
+++ b/third_party/abseil/src/absl/flags/flag_benchmark.cc
@@ -0,0 +1,159 @@
+//
+// Copyright 2020 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <stdint.h>
+
+#include <string>
+#include <vector>
+
+#include "absl/flags/flag.h"
+#include "absl/flags/marshalling.h"
+#include "absl/flags/parse.h"
+#include "absl/flags/reflection.h"
+#include "absl/strings/string_view.h"
+#include "absl/time/time.h"
+#include "absl/types/optional.h"
+#include "benchmark/benchmark.h"
+
+namespace {
+using String = std::string;
+using VectorOfStrings = std::vector<std::string>;
+using AbslDuration = absl::Duration;
+
+// We do not want to take over marshalling for the types absl::optional<int>,
+// absl::optional<std::string> which we do not own. Instead we introduce unique
+// "aliases" to these types, which we do.
+using AbslOptionalInt = absl::optional<int>;
+struct OptionalInt : AbslOptionalInt {
+ using AbslOptionalInt::AbslOptionalInt;
+};
+// Next two functions represent Abseil Flags marshalling for OptionalInt.
+bool AbslParseFlag(absl::string_view src, OptionalInt* flag,
+ std::string* error) {
+ int val;
+ if (src.empty())
+ flag->reset();
+ else if (!absl::ParseFlag(src, &val, error))
+ return false;
+ *flag = val;
+ return true;
+}
+std::string AbslUnparseFlag(const OptionalInt& flag) {
+ return !flag ? "" : absl::UnparseFlag(*flag);
+}
+
+using AbslOptionalString = absl::optional<std::string>;
+struct OptionalString : AbslOptionalString {
+ using AbslOptionalString::AbslOptionalString;
+};
+// Next two functions represent Abseil Flags marshalling for OptionalString.
+bool AbslParseFlag(absl::string_view src, OptionalString* flag,
+ std::string* error) {
+ std::string val;
+ if (src.empty())
+ flag->reset();
+ else if (!absl::ParseFlag(src, &val, error))
+ return false;
+ *flag = val;
+ return true;
+}
+std::string AbslUnparseFlag(const OptionalString& flag) {
+ return !flag ? "" : absl::UnparseFlag(*flag);
+}
+
+struct UDT {
+ UDT() = default;
+ UDT(const UDT&) {}
+ UDT& operator=(const UDT&) { return *this; }
+};
+// Next two functions represent Abseil Flags marshalling for UDT.
+bool AbslParseFlag(absl::string_view, UDT*, std::string*) { return true; }
+std::string AbslUnparseFlag(const UDT&) { return ""; }
+
+} // namespace
+
+#define BENCHMARKED_TYPES(A) \
+ A(bool) \
+ A(int16_t) \
+ A(uint16_t) \
+ A(int32_t) \
+ A(uint32_t) \
+ A(int64_t) \
+ A(uint64_t) \
+ A(double) \
+ A(float) \
+ A(String) \
+ A(VectorOfStrings) \
+ A(OptionalInt) \
+ A(OptionalString) \
+ A(AbslDuration) \
+ A(UDT)
+
+#define FLAG_DEF(T) ABSL_FLAG(T, T##_flag, {}, "");
+
+BENCHMARKED_TYPES(FLAG_DEF)
+
+// Register thousands of flags to bloat up the size of the registry.
+// This mimics real life production binaries.
+#define DEFINE_FLAG_0(name) ABSL_FLAG(int, name, 0, "");
+#define DEFINE_FLAG_1(name) DEFINE_FLAG_0(name##0) DEFINE_FLAG_0(name##1)
+#define DEFINE_FLAG_2(name) DEFINE_FLAG_1(name##0) DEFINE_FLAG_1(name##1)
+#define DEFINE_FLAG_3(name) DEFINE_FLAG_2(name##0) DEFINE_FLAG_2(name##1)
+#define DEFINE_FLAG_4(name) DEFINE_FLAG_3(name##0) DEFINE_FLAG_3(name##1)
+#define DEFINE_FLAG_5(name) DEFINE_FLAG_4(name##0) DEFINE_FLAG_4(name##1)
+#define DEFINE_FLAG_6(name) DEFINE_FLAG_5(name##0) DEFINE_FLAG_5(name##1)
+#define DEFINE_FLAG_7(name) DEFINE_FLAG_6(name##0) DEFINE_FLAG_6(name##1)
+#define DEFINE_FLAG_8(name) DEFINE_FLAG_7(name##0) DEFINE_FLAG_7(name##1)
+#define DEFINE_FLAG_9(name) DEFINE_FLAG_8(name##0) DEFINE_FLAG_8(name##1)
+#define DEFINE_FLAG_10(name) DEFINE_FLAG_9(name##0) DEFINE_FLAG_9(name##1)
+#define DEFINE_FLAG_11(name) DEFINE_FLAG_10(name##0) DEFINE_FLAG_10(name##1)
+#define DEFINE_FLAG_12(name) DEFINE_FLAG_11(name##0) DEFINE_FLAG_11(name##1)
+DEFINE_FLAG_12(bloat_flag_);
+
+namespace {
+
+#define BM_GetFlag(T) \
+ void BM_GetFlag_##T(benchmark::State& state) { \
+ for (auto _ : state) { \
+ benchmark::DoNotOptimize(absl::GetFlag(FLAGS_##T##_flag)); \
+ } \
+ } \
+ BENCHMARK(BM_GetFlag_##T);
+
+BENCHMARKED_TYPES(BM_GetFlag)
+
+void BM_ThreadedFindCommandLineFlag(benchmark::State& state) {
+ char dummy[] = "dummy";
+ char* argv[] = {dummy};
+ // We need to ensure that flags have been parsed. That is where the registry
+ // is finalized.
+ absl::ParseCommandLine(1, argv);
+
+ for (auto s : state) {
+ benchmark::DoNotOptimize(
+ absl::FindCommandLineFlag("bloat_flag_010101010101"));
+ }
+}
+BENCHMARK(BM_ThreadedFindCommandLineFlag)->ThreadRange(1, 16);
+
+} // namespace
+
+#define InvokeGetFlag(T) \
+ T AbslInvokeGetFlag##T() { return absl::GetFlag(FLAGS_##T##_flag); } \
+ int odr##T = (benchmark::DoNotOptimize(AbslInvokeGetFlag##T), 1);
+
+BENCHMARKED_TYPES(InvokeGetFlag)
+
+// To veiw disassembly use: gdb ${BINARY} -batch -ex "disassemble /s $FUNC"
diff --git a/third_party/abseil/src/absl/flags/flag_test.cc b/third_party/abseil/src/absl/flags/flag_test.cc
new file mode 100644
index 0000000..654c812
--- /dev/null
+++ b/third_party/abseil/src/absl/flags/flag_test.cc
@@ -0,0 +1,906 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/flags/flag.h"
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include <cmath>
+#include <new>
+#include <string>
+#include <thread> // NOLINT
+#include <vector>
+
+#include "gtest/gtest.h"
+#include "absl/base/attributes.h"
+#include "absl/flags/config.h"
+#include "absl/flags/declare.h"
+#include "absl/flags/internal/flag.h"
+#include "absl/flags/marshalling.h"
+#include "absl/flags/reflection.h"
+#include "absl/flags/usage_config.h"
+#include "absl/strings/match.h"
+#include "absl/strings/numbers.h"
+#include "absl/strings/str_cat.h"
+#include "absl/strings/str_split.h"
+#include "absl/strings/string_view.h"
+#include "absl/time/time.h"
+
+ABSL_DECLARE_FLAG(int64_t, mistyped_int_flag);
+ABSL_DECLARE_FLAG(std::vector<std::string>, mistyped_string_flag);
+
+namespace {
+
+namespace flags = absl::flags_internal;
+
+std::string TestHelpMsg() { return "dynamic help"; }
+#if defined(_MSC_VER) && !defined(__clang__)
+std::string TestLiteralHelpMsg() { return "literal help"; }
+#endif
+template <typename T>
+void TestMakeDflt(void* dst) {
+ new (dst) T{};
+}
+void TestCallback() {}
+
+struct UDT {
+ UDT() = default;
+ UDT(const UDT&) = default;
+};
+bool AbslParseFlag(absl::string_view, UDT*, std::string*) { return true; }
+std::string AbslUnparseFlag(const UDT&) { return ""; }
+
+class FlagTest : public testing::Test {
+ protected:
+ static void SetUpTestSuite() {
+ // Install a function to normalize filenames before this test is run.
+ absl::FlagsUsageConfig default_config;
+ default_config.normalize_filename = &FlagTest::NormalizeFileName;
+ absl::SetFlagsUsageConfig(default_config);
+ }
+
+ private:
+ static std::string NormalizeFileName(absl::string_view fname) {
+#ifdef _WIN32
+ std::string normalized(fname);
+ std::replace(normalized.begin(), normalized.end(), '\\', '/');
+ fname = normalized;
+#endif
+ return std::string(fname);
+ }
+ absl::FlagSaver flag_saver_;
+};
+
+struct S1 {
+ S1() = default;
+ S1(const S1&) = default;
+ int32_t f1;
+ int64_t f2;
+};
+
+struct S2 {
+ S2() = default;
+ S2(const S2&) = default;
+ int64_t f1;
+ double f2;
+};
+
+TEST_F(FlagTest, Traits) {
+ EXPECT_EQ(flags::StorageKind<int>(),
+ flags::FlagValueStorageKind::kOneWordAtomic);
+ EXPECT_EQ(flags::StorageKind<bool>(),
+ flags::FlagValueStorageKind::kOneWordAtomic);
+ EXPECT_EQ(flags::StorageKind<double>(),
+ flags::FlagValueStorageKind::kOneWordAtomic);
+ EXPECT_EQ(flags::StorageKind<int64_t>(),
+ flags::FlagValueStorageKind::kOneWordAtomic);
+
+#if defined(ABSL_FLAGS_INTERNAL_ATOMIC_DOUBLE_WORD)
+ EXPECT_EQ(flags::StorageKind<S1>(),
+ flags::FlagValueStorageKind::kTwoWordsAtomic);
+ EXPECT_EQ(flags::StorageKind<S2>(),
+ flags::FlagValueStorageKind::kTwoWordsAtomic);
+#else
+ EXPECT_EQ(flags::StorageKind<S1>(),
+ flags::FlagValueStorageKind::kAlignedBuffer);
+ EXPECT_EQ(flags::StorageKind<S2>(),
+ flags::FlagValueStorageKind::kAlignedBuffer);
+#endif
+
+ EXPECT_EQ(flags::StorageKind<std::string>(),
+ flags::FlagValueStorageKind::kAlignedBuffer);
+ EXPECT_EQ(flags::StorageKind<std::vector<std::string>>(),
+ flags::FlagValueStorageKind::kAlignedBuffer);
+}
+
+// --------------------------------------------------------------------
+
+constexpr flags::FlagHelpArg help_arg{flags::FlagHelpMsg("literal help"),
+ flags::FlagHelpKind::kLiteral};
+
+using String = std::string;
+
+#if !defined(_MSC_VER) || defined(__clang__)
+#define DEFINE_CONSTRUCTED_FLAG(T, dflt, dflt_kind) \
+ constexpr flags::FlagDefaultArg f1default##T{ \
+ flags::FlagDefaultSrc{dflt}, flags::FlagDefaultKind::dflt_kind}; \
+ constexpr absl::Flag<T> f1##T{"f1", "file", help_arg, f1default##T}; \
+ ABSL_CONST_INIT absl::Flag<T> f2##T { \
+ "f2", "file", \
+ {flags::FlagHelpMsg(&TestHelpMsg), flags::FlagHelpKind::kGenFunc}, \
+ flags::FlagDefaultArg { \
+ flags::FlagDefaultSrc(&TestMakeDflt<T>), \
+ flags::FlagDefaultKind::kGenFunc \
+ } \
+ }
+#else
+#define DEFINE_CONSTRUCTED_FLAG(T, dflt, dflt_kind) \
+ constexpr flags::FlagDefaultArg f1default##T{ \
+ flags::FlagDefaultSrc{dflt}, flags::FlagDefaultKind::dflt_kind}; \
+ constexpr absl::Flag<T> f1##T{"f1", "file", &TestLiteralHelpMsg, \
+ &TestMakeDflt<T>}; \
+ ABSL_CONST_INIT absl::Flag<T> f2##T { \
+ "f2", "file", &TestHelpMsg, &TestMakeDflt<T> \
+ }
+#endif
+
+DEFINE_CONSTRUCTED_FLAG(bool, true, kOneWord);
+DEFINE_CONSTRUCTED_FLAG(int16_t, 1, kOneWord);
+DEFINE_CONSTRUCTED_FLAG(uint16_t, 2, kOneWord);
+DEFINE_CONSTRUCTED_FLAG(int32_t, 3, kOneWord);
+DEFINE_CONSTRUCTED_FLAG(uint32_t, 4, kOneWord);
+DEFINE_CONSTRUCTED_FLAG(int64_t, 5, kOneWord);
+DEFINE_CONSTRUCTED_FLAG(uint64_t, 6, kOneWord);
+DEFINE_CONSTRUCTED_FLAG(float, 7.8, kOneWord);
+DEFINE_CONSTRUCTED_FLAG(double, 9.10, kOneWord);
+DEFINE_CONSTRUCTED_FLAG(String, &TestMakeDflt<String>, kGenFunc);
+DEFINE_CONSTRUCTED_FLAG(UDT, &TestMakeDflt<UDT>, kGenFunc);
+
+template <typename T>
+bool TestConstructionFor(const absl::Flag<T>& f1, absl::Flag<T>& f2) {
+ EXPECT_EQ(absl::GetFlagReflectionHandle(f1).Name(), "f1");
+ EXPECT_EQ(absl::GetFlagReflectionHandle(f1).Help(), "literal help");
+ EXPECT_EQ(absl::GetFlagReflectionHandle(f1).Filename(), "file");
+
+ flags::FlagRegistrar<T, false>(ABSL_FLAG_IMPL_FLAG_PTR(f2))
+ .OnUpdate(TestCallback);
+
+ EXPECT_EQ(absl::GetFlagReflectionHandle(f2).Name(), "f2");
+ EXPECT_EQ(absl::GetFlagReflectionHandle(f2).Help(), "dynamic help");
+ EXPECT_EQ(absl::GetFlagReflectionHandle(f2).Filename(), "file");
+
+ return true;
+}
+
+#define TEST_CONSTRUCTED_FLAG(T) TestConstructionFor(f1##T, f2##T);
+
+TEST_F(FlagTest, TestConstruction) {
+ TEST_CONSTRUCTED_FLAG(bool);
+ TEST_CONSTRUCTED_FLAG(int16_t);
+ TEST_CONSTRUCTED_FLAG(uint16_t);
+ TEST_CONSTRUCTED_FLAG(int32_t);
+ TEST_CONSTRUCTED_FLAG(uint32_t);
+ TEST_CONSTRUCTED_FLAG(int64_t);
+ TEST_CONSTRUCTED_FLAG(uint64_t);
+ TEST_CONSTRUCTED_FLAG(float);
+ TEST_CONSTRUCTED_FLAG(double);
+ TEST_CONSTRUCTED_FLAG(String);
+ TEST_CONSTRUCTED_FLAG(UDT);
+}
+
+// --------------------------------------------------------------------
+
+} // namespace
+
+ABSL_DECLARE_FLAG(bool, test_flag_01);
+ABSL_DECLARE_FLAG(int, test_flag_02);
+ABSL_DECLARE_FLAG(int16_t, test_flag_03);
+ABSL_DECLARE_FLAG(uint16_t, test_flag_04);
+ABSL_DECLARE_FLAG(int32_t, test_flag_05);
+ABSL_DECLARE_FLAG(uint32_t, test_flag_06);
+ABSL_DECLARE_FLAG(int64_t, test_flag_07);
+ABSL_DECLARE_FLAG(uint64_t, test_flag_08);
+ABSL_DECLARE_FLAG(double, test_flag_09);
+ABSL_DECLARE_FLAG(float, test_flag_10);
+ABSL_DECLARE_FLAG(std::string, test_flag_11);
+ABSL_DECLARE_FLAG(absl::Duration, test_flag_12);
+
+namespace {
+
+#if !ABSL_FLAGS_STRIP_NAMES
+
+TEST_F(FlagTest, TestFlagDeclaration) {
+ // test that we can access flag objects.
+ EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_01).Name(),
+ "test_flag_01");
+ EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_02).Name(),
+ "test_flag_02");
+ EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_03).Name(),
+ "test_flag_03");
+ EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_04).Name(),
+ "test_flag_04");
+ EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_05).Name(),
+ "test_flag_05");
+ EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_06).Name(),
+ "test_flag_06");
+ EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_07).Name(),
+ "test_flag_07");
+ EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_08).Name(),
+ "test_flag_08");
+ EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_09).Name(),
+ "test_flag_09");
+ EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_10).Name(),
+ "test_flag_10");
+ EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_11).Name(),
+ "test_flag_11");
+ EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_12).Name(),
+ "test_flag_12");
+}
+#endif // !ABSL_FLAGS_STRIP_NAMES
+
+// --------------------------------------------------------------------
+
+} // namespace
+
+ABSL_FLAG(bool, test_flag_01, true, "test flag 01");
+ABSL_FLAG(int, test_flag_02, 1234, "test flag 02");
+ABSL_FLAG(int16_t, test_flag_03, -34, "test flag 03");
+ABSL_FLAG(uint16_t, test_flag_04, 189, "test flag 04");
+ABSL_FLAG(int32_t, test_flag_05, 10765, "test flag 05");
+ABSL_FLAG(uint32_t, test_flag_06, 40000, "test flag 06");
+ABSL_FLAG(int64_t, test_flag_07, -1234567, "test flag 07");
+ABSL_FLAG(uint64_t, test_flag_08, 9876543, "test flag 08");
+ABSL_FLAG(double, test_flag_09, -9.876e-50, "test flag 09");
+ABSL_FLAG(float, test_flag_10, 1.234e12f, "test flag 10");
+ABSL_FLAG(std::string, test_flag_11, "", "test flag 11");
+ABSL_FLAG(absl::Duration, test_flag_12, absl::Minutes(10), "test flag 12");
+
+namespace {
+
+#if !ABSL_FLAGS_STRIP_NAMES
+TEST_F(FlagTest, TestFlagDefinition) {
+ absl::string_view expected_file_name = "absl/flags/flag_test.cc";
+
+ EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_01).Name(),
+ "test_flag_01");
+ EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_01).Help(),
+ "test flag 01");
+ EXPECT_TRUE(absl::EndsWith(
+ absl::GetFlagReflectionHandle(FLAGS_test_flag_01).Filename(),
+ expected_file_name))
+ << absl::GetFlagReflectionHandle(FLAGS_test_flag_01).Filename();
+
+ EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_02).Name(),
+ "test_flag_02");
+ EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_02).Help(),
+ "test flag 02");
+ EXPECT_TRUE(absl::EndsWith(
+ absl::GetFlagReflectionHandle(FLAGS_test_flag_02).Filename(),
+ expected_file_name))
+ << absl::GetFlagReflectionHandle(FLAGS_test_flag_02).Filename();
+
+ EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_03).Name(),
+ "test_flag_03");
+ EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_03).Help(),
+ "test flag 03");
+ EXPECT_TRUE(absl::EndsWith(
+ absl::GetFlagReflectionHandle(FLAGS_test_flag_03).Filename(),
+ expected_file_name))
+ << absl::GetFlagReflectionHandle(FLAGS_test_flag_03).Filename();
+
+ EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_04).Name(),
+ "test_flag_04");
+ EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_04).Help(),
+ "test flag 04");
+ EXPECT_TRUE(absl::EndsWith(
+ absl::GetFlagReflectionHandle(FLAGS_test_flag_04).Filename(),
+ expected_file_name))
+ << absl::GetFlagReflectionHandle(FLAGS_test_flag_04).Filename();
+
+ EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_05).Name(),
+ "test_flag_05");
+ EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_05).Help(),
+ "test flag 05");
+ EXPECT_TRUE(absl::EndsWith(
+ absl::GetFlagReflectionHandle(FLAGS_test_flag_05).Filename(),
+ expected_file_name))
+ << absl::GetFlagReflectionHandle(FLAGS_test_flag_05).Filename();
+
+ EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_06).Name(),
+ "test_flag_06");
+ EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_06).Help(),
+ "test flag 06");
+ EXPECT_TRUE(absl::EndsWith(
+ absl::GetFlagReflectionHandle(FLAGS_test_flag_06).Filename(),
+ expected_file_name))
+ << absl::GetFlagReflectionHandle(FLAGS_test_flag_06).Filename();
+
+ EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_07).Name(),
+ "test_flag_07");
+ EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_07).Help(),
+ "test flag 07");
+ EXPECT_TRUE(absl::EndsWith(
+ absl::GetFlagReflectionHandle(FLAGS_test_flag_07).Filename(),
+ expected_file_name))
+ << absl::GetFlagReflectionHandle(FLAGS_test_flag_07).Filename();
+
+ EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_08).Name(),
+ "test_flag_08");
+ EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_08).Help(),
+ "test flag 08");
+ EXPECT_TRUE(absl::EndsWith(
+ absl::GetFlagReflectionHandle(FLAGS_test_flag_08).Filename(),
+ expected_file_name))
+ << absl::GetFlagReflectionHandle(FLAGS_test_flag_08).Filename();
+
+ EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_09).Name(),
+ "test_flag_09");
+ EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_09).Help(),
+ "test flag 09");
+ EXPECT_TRUE(absl::EndsWith(
+ absl::GetFlagReflectionHandle(FLAGS_test_flag_09).Filename(),
+ expected_file_name))
+ << absl::GetFlagReflectionHandle(FLAGS_test_flag_09).Filename();
+
+ EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_10).Name(),
+ "test_flag_10");
+ EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_10).Help(),
+ "test flag 10");
+ EXPECT_TRUE(absl::EndsWith(
+ absl::GetFlagReflectionHandle(FLAGS_test_flag_10).Filename(),
+ expected_file_name))
+ << absl::GetFlagReflectionHandle(FLAGS_test_flag_10).Filename();
+
+ EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_11).Name(),
+ "test_flag_11");
+ EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_11).Help(),
+ "test flag 11");
+ EXPECT_TRUE(absl::EndsWith(
+ absl::GetFlagReflectionHandle(FLAGS_test_flag_11).Filename(),
+ expected_file_name))
+ << absl::GetFlagReflectionHandle(FLAGS_test_flag_11).Filename();
+
+ EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_12).Name(),
+ "test_flag_12");
+ EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_12).Help(),
+ "test flag 12");
+ EXPECT_TRUE(absl::EndsWith(
+ absl::GetFlagReflectionHandle(FLAGS_test_flag_12).Filename(),
+ expected_file_name))
+ << absl::GetFlagReflectionHandle(FLAGS_test_flag_12).Filename();
+}
+#endif // !ABSL_FLAGS_STRIP_NAMES
+
+// --------------------------------------------------------------------
+
+TEST_F(FlagTest, TestDefault) {
+ EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_01).DefaultValue(),
+ "true");
+ EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_02).DefaultValue(),
+ "1234");
+ EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_03).DefaultValue(),
+ "-34");
+ EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_04).DefaultValue(),
+ "189");
+ EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_05).DefaultValue(),
+ "10765");
+ EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_06).DefaultValue(),
+ "40000");
+ EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_07).DefaultValue(),
+ "-1234567");
+ EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_08).DefaultValue(),
+ "9876543");
+ EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_09).DefaultValue(),
+ "-9.876e-50");
+ EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_10).DefaultValue(),
+ "1.234e+12");
+ EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_11).DefaultValue(),
+ "");
+ EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_12).DefaultValue(),
+ "10m");
+
+ EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_01).CurrentValue(),
+ "true");
+ EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_02).CurrentValue(),
+ "1234");
+ EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_03).CurrentValue(),
+ "-34");
+ EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_04).CurrentValue(),
+ "189");
+ EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_05).CurrentValue(),
+ "10765");
+ EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_06).CurrentValue(),
+ "40000");
+ EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_07).CurrentValue(),
+ "-1234567");
+ EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_08).CurrentValue(),
+ "9876543");
+ EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_09).CurrentValue(),
+ "-9.876e-50");
+ EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_10).CurrentValue(),
+ "1.234e+12");
+ EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_11).CurrentValue(),
+ "");
+ EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_12).CurrentValue(),
+ "10m");
+
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_01), true);
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_02), 1234);
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_03), -34);
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_04), 189);
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_05), 10765);
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_06), 40000);
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_07), -1234567);
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_08), 9876543);
+ EXPECT_NEAR(absl::GetFlag(FLAGS_test_flag_09), -9.876e-50, 1e-55);
+ EXPECT_NEAR(absl::GetFlag(FLAGS_test_flag_10), 1.234e12f, 1e5f);
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_11), "");
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_12), absl::Minutes(10));
+}
+
+// --------------------------------------------------------------------
+
+struct NonTriviallyCopyableAggregate {
+ NonTriviallyCopyableAggregate() = default;
+ NonTriviallyCopyableAggregate(const NonTriviallyCopyableAggregate& rhs)
+ : value(rhs.value) {}
+ NonTriviallyCopyableAggregate& operator=(
+ const NonTriviallyCopyableAggregate& rhs) {
+ value = rhs.value;
+ return *this;
+ }
+
+ int value;
+};
+bool AbslParseFlag(absl::string_view src, NonTriviallyCopyableAggregate* f,
+ std::string* e) {
+ return absl::ParseFlag(src, &f->value, e);
+}
+std::string AbslUnparseFlag(const NonTriviallyCopyableAggregate& ntc) {
+ return absl::StrCat(ntc.value);
+}
+
+bool operator==(const NonTriviallyCopyableAggregate& ntc1,
+ const NonTriviallyCopyableAggregate& ntc2) {
+ return ntc1.value == ntc2.value;
+}
+
+} // namespace
+
+ABSL_FLAG(bool, test_flag_eb_01, {}, "");
+ABSL_FLAG(int32_t, test_flag_eb_02, {}, "");
+ABSL_FLAG(int64_t, test_flag_eb_03, {}, "");
+ABSL_FLAG(double, test_flag_eb_04, {}, "");
+ABSL_FLAG(std::string, test_flag_eb_05, {}, "");
+ABSL_FLAG(NonTriviallyCopyableAggregate, test_flag_eb_06, {}, "");
+
+namespace {
+
+TEST_F(FlagTest, TestEmptyBracesDefault) {
+ EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_eb_01).DefaultValue(),
+ "false");
+ EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_eb_02).DefaultValue(),
+ "0");
+ EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_eb_03).DefaultValue(),
+ "0");
+ EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_eb_04).DefaultValue(),
+ "0");
+ EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_eb_05).DefaultValue(),
+ "");
+ EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_eb_06).DefaultValue(),
+ "0");
+
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_eb_01), false);
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_eb_02), 0);
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_eb_03), 0);
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_eb_04), 0.0);
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_eb_05), "");
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_eb_06),
+ NonTriviallyCopyableAggregate{});
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(FlagTest, TestGetSet) {
+ absl::SetFlag(&FLAGS_test_flag_01, false);
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_01), false);
+
+ absl::SetFlag(&FLAGS_test_flag_02, 321);
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_02), 321);
+
+ absl::SetFlag(&FLAGS_test_flag_03, 67);
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_03), 67);
+
+ absl::SetFlag(&FLAGS_test_flag_04, 1);
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_04), 1);
+
+ absl::SetFlag(&FLAGS_test_flag_05, -908);
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_05), -908);
+
+ absl::SetFlag(&FLAGS_test_flag_06, 4001);
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_06), 4001);
+
+ absl::SetFlag(&FLAGS_test_flag_07, -23456);
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_07), -23456);
+
+ absl::SetFlag(&FLAGS_test_flag_08, 975310);
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_08), 975310);
+
+ absl::SetFlag(&FLAGS_test_flag_09, 1.00001);
+ EXPECT_NEAR(absl::GetFlag(FLAGS_test_flag_09), 1.00001, 1e-10);
+
+ absl::SetFlag(&FLAGS_test_flag_10, -3.54f);
+ EXPECT_NEAR(absl::GetFlag(FLAGS_test_flag_10), -3.54f, 1e-6f);
+
+ absl::SetFlag(&FLAGS_test_flag_11, "asdf");
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_11), "asdf");
+
+ absl::SetFlag(&FLAGS_test_flag_12, absl::Seconds(110));
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_12), absl::Seconds(110));
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(FlagTest, TestGetViaReflection) {
+ auto* handle = absl::FindCommandLineFlag("test_flag_01");
+ EXPECT_EQ(*handle->TryGet<bool>(), true);
+ handle = absl::FindCommandLineFlag("test_flag_02");
+ EXPECT_EQ(*handle->TryGet<int>(), 1234);
+ handle = absl::FindCommandLineFlag("test_flag_03");
+ EXPECT_EQ(*handle->TryGet<int16_t>(), -34);
+ handle = absl::FindCommandLineFlag("test_flag_04");
+ EXPECT_EQ(*handle->TryGet<uint16_t>(), 189);
+ handle = absl::FindCommandLineFlag("test_flag_05");
+ EXPECT_EQ(*handle->TryGet<int32_t>(), 10765);
+ handle = absl::FindCommandLineFlag("test_flag_06");
+ EXPECT_EQ(*handle->TryGet<uint32_t>(), 40000);
+ handle = absl::FindCommandLineFlag("test_flag_07");
+ EXPECT_EQ(*handle->TryGet<int64_t>(), -1234567);
+ handle = absl::FindCommandLineFlag("test_flag_08");
+ EXPECT_EQ(*handle->TryGet<uint64_t>(), 9876543);
+ handle = absl::FindCommandLineFlag("test_flag_09");
+ EXPECT_NEAR(*handle->TryGet<double>(), -9.876e-50, 1e-55);
+ handle = absl::FindCommandLineFlag("test_flag_10");
+ EXPECT_NEAR(*handle->TryGet<float>(), 1.234e12f, 1e5f);
+ handle = absl::FindCommandLineFlag("test_flag_11");
+ EXPECT_EQ(*handle->TryGet<std::string>(), "");
+ handle = absl::FindCommandLineFlag("test_flag_12");
+ EXPECT_EQ(*handle->TryGet<absl::Duration>(), absl::Minutes(10));
+}
+
+// --------------------------------------------------------------------
+
+int GetDflt1() { return 1; }
+
+} // namespace
+
+ABSL_FLAG(int, test_int_flag_with_non_const_default, GetDflt1(),
+ "test int flag non const default");
+ABSL_FLAG(std::string, test_string_flag_with_non_const_default,
+ absl::StrCat("AAA", "BBB"), "test string flag non const default");
+
+namespace {
+
+TEST_F(FlagTest, TestNonConstexprDefault) {
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_int_flag_with_non_const_default), 1);
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_string_flag_with_non_const_default),
+ "AAABBB");
+}
+
+// --------------------------------------------------------------------
+
+} // namespace
+
+ABSL_FLAG(bool, test_flag_with_non_const_help, true,
+ absl::StrCat("test ", "flag ", "non const help"));
+
+namespace {
+
+#if !ABSL_FLAGS_STRIP_HELP
+TEST_F(FlagTest, TestNonConstexprHelp) {
+ EXPECT_EQ(
+ absl::GetFlagReflectionHandle(FLAGS_test_flag_with_non_const_help).Help(),
+ "test flag non const help");
+}
+#endif //! ABSL_FLAGS_STRIP_HELP
+
+// --------------------------------------------------------------------
+
+int cb_test_value = -1;
+void TestFlagCB();
+
+} // namespace
+
+ABSL_FLAG(int, test_flag_with_cb, 100, "").OnUpdate(TestFlagCB);
+
+ABSL_FLAG(int, test_flag_with_lambda_cb, 200, "").OnUpdate([]() {
+ cb_test_value = absl::GetFlag(FLAGS_test_flag_with_lambda_cb) +
+ absl::GetFlag(FLAGS_test_flag_with_cb);
+});
+
+namespace {
+
+void TestFlagCB() { cb_test_value = absl::GetFlag(FLAGS_test_flag_with_cb); }
+
+// Tests side-effects of callback invocation.
+TEST_F(FlagTest, CallbackInvocation) {
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_with_cb), 100);
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_with_lambda_cb), 200);
+ EXPECT_EQ(cb_test_value, 300);
+
+ absl::SetFlag(&FLAGS_test_flag_with_cb, 1);
+ EXPECT_EQ(cb_test_value, 1);
+
+ absl::SetFlag(&FLAGS_test_flag_with_lambda_cb, 3);
+ EXPECT_EQ(cb_test_value, 4);
+}
+
+// --------------------------------------------------------------------
+
+struct CustomUDT {
+ CustomUDT() : a(1), b(1) {}
+ CustomUDT(int a_, int b_) : a(a_), b(b_) {}
+
+ friend bool operator==(const CustomUDT& f1, const CustomUDT& f2) {
+ return f1.a == f2.a && f1.b == f2.b;
+ }
+
+ int a;
+ int b;
+};
+bool AbslParseFlag(absl::string_view in, CustomUDT* f, std::string*) {
+ std::vector<absl::string_view> parts =
+ absl::StrSplit(in, ':', absl::SkipWhitespace());
+
+ if (parts.size() != 2) return false;
+
+ if (!absl::SimpleAtoi(parts[0], &f->a)) return false;
+
+ if (!absl::SimpleAtoi(parts[1], &f->b)) return false;
+
+ return true;
+}
+std::string AbslUnparseFlag(const CustomUDT& f) {
+ return absl::StrCat(f.a, ":", f.b);
+}
+
+} // namespace
+
+ABSL_FLAG(CustomUDT, test_flag_custom_udt, CustomUDT(), "test flag custom UDT");
+
+namespace {
+
+TEST_F(FlagTest, TestCustomUDT) {
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_custom_udt), CustomUDT(1, 1));
+ absl::SetFlag(&FLAGS_test_flag_custom_udt, CustomUDT(2, 3));
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_custom_udt), CustomUDT(2, 3));
+}
+
+// MSVC produces link error on the type mismatch.
+// Linux does not have build errors and validations work as expected.
+#if !defined(_WIN32) && GTEST_HAS_DEATH_TEST
+
+using FlagDeathTest = FlagTest;
+
+TEST_F(FlagDeathTest, TestTypeMismatchValidations) {
+#if !defined(NDEBUG)
+ EXPECT_DEATH_IF_SUPPORTED(
+ static_cast<void>(absl::GetFlag(FLAGS_mistyped_int_flag)),
+ "Flag 'mistyped_int_flag' is defined as one type and declared "
+ "as another");
+ EXPECT_DEATH_IF_SUPPORTED(
+ static_cast<void>(absl::GetFlag(FLAGS_mistyped_string_flag)),
+ "Flag 'mistyped_string_flag' is defined as one type and "
+ "declared as another");
+#endif
+
+ EXPECT_DEATH_IF_SUPPORTED(
+ absl::SetFlag(&FLAGS_mistyped_int_flag, 1),
+ "Flag 'mistyped_int_flag' is defined as one type and declared "
+ "as another");
+ EXPECT_DEATH_IF_SUPPORTED(
+ absl::SetFlag(&FLAGS_mistyped_string_flag, std::vector<std::string>{}),
+ "Flag 'mistyped_string_flag' is defined as one type and declared as "
+ "another");
+}
+
+#endif
+
+// --------------------------------------------------------------------
+
+// A contrived type that offers implicit and explicit conversion from specific
+// source types.
+struct ConversionTestVal {
+ ConversionTestVal() = default;
+ explicit ConversionTestVal(int a_in) : a(a_in) {}
+
+ enum class ViaImplicitConv { kTen = 10, kEleven };
+ // NOLINTNEXTLINE
+ ConversionTestVal(ViaImplicitConv from) : a(static_cast<int>(from)) {}
+
+ int a;
+};
+
+bool AbslParseFlag(absl::string_view in, ConversionTestVal* val_out,
+ std::string*) {
+ if (!absl::SimpleAtoi(in, &val_out->a)) {
+ return false;
+ }
+ return true;
+}
+std::string AbslUnparseFlag(const ConversionTestVal& val) {
+ return absl::StrCat(val.a);
+}
+
+} // namespace
+
+// Flag default values can be specified with a value that converts to the flag
+// value type implicitly.
+ABSL_FLAG(ConversionTestVal, test_flag_implicit_conv,
+ ConversionTestVal::ViaImplicitConv::kTen,
+ "test flag init via implicit conversion");
+
+namespace {
+
+TEST_F(FlagTest, CanSetViaImplicitConversion) {
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_implicit_conv).a, 10);
+ absl::SetFlag(&FLAGS_test_flag_implicit_conv,
+ ConversionTestVal::ViaImplicitConv::kEleven);
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_implicit_conv).a, 11);
+}
+
+// --------------------------------------------------------------------
+
+struct NonDfltConstructible {
+ public:
+ // This constructor tests that we can initialize the flag with int value
+ NonDfltConstructible(int i) : value(i) {} // NOLINT
+
+ // This constructor tests that we can't initialize the flag with char value
+ // but can with explicitly constructed NonDfltConstructible.
+ explicit NonDfltConstructible(char c) : value(100 + static_cast<int>(c)) {}
+
+ int value;
+};
+
+bool AbslParseFlag(absl::string_view in, NonDfltConstructible* ndc_out,
+ std::string*) {
+ return absl::SimpleAtoi(in, &ndc_out->value);
+}
+std::string AbslUnparseFlag(const NonDfltConstructible& ndc) {
+ return absl::StrCat(ndc.value);
+}
+
+} // namespace
+
+ABSL_FLAG(NonDfltConstructible, ndc_flag1, NonDfltConstructible('1'),
+ "Flag with non default constructible type");
+ABSL_FLAG(NonDfltConstructible, ndc_flag2, 0,
+ "Flag with non default constructible type");
+
+namespace {
+
+TEST_F(FlagTest, TestNonDefaultConstructibleType) {
+ EXPECT_EQ(absl::GetFlag(FLAGS_ndc_flag1).value, '1' + 100);
+ EXPECT_EQ(absl::GetFlag(FLAGS_ndc_flag2).value, 0);
+
+ absl::SetFlag(&FLAGS_ndc_flag1, NonDfltConstructible('A'));
+ absl::SetFlag(&FLAGS_ndc_flag2, 25);
+
+ EXPECT_EQ(absl::GetFlag(FLAGS_ndc_flag1).value, 'A' + 100);
+ EXPECT_EQ(absl::GetFlag(FLAGS_ndc_flag2).value, 25);
+}
+
+} // namespace
+
+// --------------------------------------------------------------------
+
+ABSL_RETIRED_FLAG(bool, old_bool_flag, true, "old descr");
+ABSL_RETIRED_FLAG(int, old_int_flag, (int)std::sqrt(10), "old descr");
+ABSL_RETIRED_FLAG(std::string, old_str_flag, "", absl::StrCat("old ", "descr"));
+
+bool initializaion_order_fiasco_test = [] {
+ // Iterate over all the flags during static initialization.
+ // This should not trigger ASan's initialization-order-fiasco.
+ auto* handle1 = absl::FindCommandLineFlag("flag_on_separate_file");
+ auto* handle2 = absl::FindCommandLineFlag("retired_flag_on_separate_file");
+ if (handle1 != nullptr && handle2 != nullptr) {
+ return handle1->Name() == handle2->Name();
+ }
+ return true;
+}();
+
+namespace {
+
+TEST_F(FlagTest, TestRetiredFlagRegistration) {
+ auto* handle = absl::FindCommandLineFlag("old_bool_flag");
+ EXPECT_TRUE(handle->IsOfType<bool>());
+ EXPECT_TRUE(handle->IsRetired());
+ handle = absl::FindCommandLineFlag("old_int_flag");
+ EXPECT_TRUE(handle->IsOfType<int>());
+ EXPECT_TRUE(handle->IsRetired());
+ handle = absl::FindCommandLineFlag("old_str_flag");
+ EXPECT_TRUE(handle->IsOfType<std::string>());
+ EXPECT_TRUE(handle->IsRetired());
+}
+
+} // namespace
+
+// --------------------------------------------------------------------
+
+namespace {
+
+// User-defined type with small alignment, but size exceeding 16.
+struct SmallAlignUDT {
+ SmallAlignUDT() : c('A'), s(12) {}
+ char c;
+ int16_t s;
+ char bytes[14];
+};
+
+bool AbslParseFlag(absl::string_view, SmallAlignUDT*, std::string*) {
+ return true;
+}
+std::string AbslUnparseFlag(const SmallAlignUDT&) { return ""; }
+
+// User-defined type with small size, but not trivially copyable.
+struct NonTriviallyCopyableUDT {
+ NonTriviallyCopyableUDT() : c('A') {}
+ NonTriviallyCopyableUDT(const NonTriviallyCopyableUDT& rhs) : c(rhs.c) {}
+ NonTriviallyCopyableUDT& operator=(const NonTriviallyCopyableUDT& rhs) {
+ c = rhs.c;
+ return *this;
+ }
+
+ char c;
+};
+
+bool AbslParseFlag(absl::string_view, NonTriviallyCopyableUDT*, std::string*) {
+ return true;
+}
+std::string AbslUnparseFlag(const NonTriviallyCopyableUDT&) { return ""; }
+
+} // namespace
+
+ABSL_FLAG(SmallAlignUDT, test_flag_sa_udt, {}, "help");
+ABSL_FLAG(NonTriviallyCopyableUDT, test_flag_ntc_udt, {}, "help");
+
+namespace {
+
+TEST_F(FlagTest, TestSmallAlignUDT) {
+ SmallAlignUDT value = absl::GetFlag(FLAGS_test_flag_sa_udt);
+ EXPECT_EQ(value.c, 'A');
+ EXPECT_EQ(value.s, 12);
+
+ value.c = 'B';
+ value.s = 45;
+ absl::SetFlag(&FLAGS_test_flag_sa_udt, value);
+ value = absl::GetFlag(FLAGS_test_flag_sa_udt);
+ EXPECT_EQ(value.c, 'B');
+ EXPECT_EQ(value.s, 45);
+}
+
+TEST_F(FlagTest, TestNonTriviallyCopyableUDT) {
+ NonTriviallyCopyableUDT value = absl::GetFlag(FLAGS_test_flag_ntc_udt);
+ EXPECT_EQ(value.c, 'A');
+
+ value.c = 'B';
+ absl::SetFlag(&FLAGS_test_flag_ntc_udt, value);
+ value = absl::GetFlag(FLAGS_test_flag_ntc_udt);
+ EXPECT_EQ(value.c, 'B');
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/flags/flag_test_defs.cc b/third_party/abseil/src/absl/flags/flag_test_defs.cc
new file mode 100644
index 0000000..4e1693c
--- /dev/null
+++ b/third_party/abseil/src/absl/flags/flag_test_defs.cc
@@ -0,0 +1,24 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// This file is used to test the mismatch of the flag type between definition
+// and declaration. These are definitions. flag_test.cc contains declarations.
+#include <string>
+#include "absl/flags/flag.h"
+
+ABSL_FLAG(int, mistyped_int_flag, 0, "");
+ABSL_FLAG(std::string, mistyped_string_flag, "", "");
+ABSL_FLAG(bool, flag_on_separate_file, false, "");
+ABSL_RETIRED_FLAG(bool, retired_flag_on_separate_file, false, "");
diff --git a/third_party/abseil/src/absl/flags/internal/commandlineflag.cc b/third_party/abseil/src/absl/flags/internal/commandlineflag.cc
new file mode 100644
index 0000000..4482955
--- /dev/null
+++ b/third_party/abseil/src/absl/flags/internal/commandlineflag.cc
@@ -0,0 +1,26 @@
+//
+// Copyright 2020 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/flags/internal/commandlineflag.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace flags_internal {
+
+FlagStateInterface::~FlagStateInterface() {}
+
+} // namespace flags_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/flags/internal/commandlineflag.h b/third_party/abseil/src/absl/flags/internal/commandlineflag.h
new file mode 100644
index 0000000..cb46fe2
--- /dev/null
+++ b/third_party/abseil/src/absl/flags/internal/commandlineflag.h
@@ -0,0 +1,68 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_FLAGS_INTERNAL_COMMANDLINEFLAG_H_
+#define ABSL_FLAGS_INTERNAL_COMMANDLINEFLAG_H_
+
+#include "absl/base/config.h"
+#include "absl/base/internal/fast_type_id.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace flags_internal {
+
+// An alias for flag fast type id. This value identifies the flag value type
+// simialarly to typeid(T), without relying on RTTI being available. In most
+// cases this id is enough to uniquely identify the flag's value type. In a few
+// cases we'll have to resort to using actual RTTI implementation if it is
+// available.
+using FlagFastTypeId = absl::base_internal::FastTypeIdType;
+
+// Options that control SetCommandLineOptionWithMode.
+enum FlagSettingMode {
+ // update the flag's value unconditionally (can call this multiple times).
+ SET_FLAGS_VALUE,
+ // update the flag's value, but *only if* it has not yet been updated
+ // with SET_FLAGS_VALUE, SET_FLAG_IF_DEFAULT, or "FLAGS_xxx = nondef".
+ SET_FLAG_IF_DEFAULT,
+ // set the flag's default value to this. If the flag has not been updated
+ // yet (via SET_FLAGS_VALUE, SET_FLAG_IF_DEFAULT, or "FLAGS_xxx = nondef")
+ // change the flag's current value to the new default value as well.
+ SET_FLAGS_DEFAULT
+};
+
+// Options that control ParseFrom: Source of a value.
+enum ValueSource {
+ // Flag is being set by value specified on a command line.
+ kCommandLine,
+ // Flag is being set by value specified in the code.
+ kProgrammaticChange,
+};
+
+// Handle to FlagState objects. Specific flag state objects will restore state
+// of a flag produced this flag state from method CommandLineFlag::SaveState().
+class FlagStateInterface {
+ public:
+ virtual ~FlagStateInterface();
+
+ // Restores the flag originated this object to the saved state.
+ virtual void Restore() const = 0;
+};
+
+} // namespace flags_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_FLAGS_INTERNAL_COMMANDLINEFLAG_H_
diff --git a/third_party/abseil/src/absl/flags/internal/flag.cc b/third_party/abseil/src/absl/flags/internal/flag.cc
new file mode 100644
index 0000000..1502e7f
--- /dev/null
+++ b/third_party/abseil/src/absl/flags/internal/flag.cc
@@ -0,0 +1,568 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/flags/internal/flag.h"
+
+#include <assert.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <string.h>
+
+#include <array>
+#include <atomic>
+#include <memory>
+#include <new>
+#include <string>
+#include <typeinfo>
+
+#include "absl/base/call_once.h"
+#include "absl/base/casts.h"
+#include "absl/base/config.h"
+#include "absl/base/optimization.h"
+#include "absl/flags/config.h"
+#include "absl/flags/internal/commandlineflag.h"
+#include "absl/flags/usage_config.h"
+#include "absl/memory/memory.h"
+#include "absl/strings/str_cat.h"
+#include "absl/strings/string_view.h"
+#include "absl/synchronization/mutex.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace flags_internal {
+
+// The help message indicating that the commandline flag has been
+// 'stripped'. It will not show up when doing "-help" and its
+// variants. The flag is stripped if ABSL_FLAGS_STRIP_HELP is set to 1
+// before including absl/flags/flag.h
+const char kStrippedFlagHelp[] = "\001\002\003\004 (unknown) \004\003\002\001";
+
+namespace {
+
+// Currently we only validate flag values for user-defined flag types.
+bool ShouldValidateFlagValue(FlagFastTypeId flag_type_id) {
+#define DONT_VALIDATE(T, _) \
+ if (flag_type_id == base_internal::FastTypeId<T>()) return false;
+ ABSL_FLAGS_INTERNAL_SUPPORTED_TYPES(DONT_VALIDATE)
+#undef DONT_VALIDATE
+
+ return true;
+}
+
+// RAII helper used to temporarily unlock and relock `absl::Mutex`.
+// This is used when we need to ensure that locks are released while
+// invoking user supplied callbacks and then reacquired, since callbacks may
+// need to acquire these locks themselves.
+class MutexRelock {
+ public:
+ explicit MutexRelock(absl::Mutex& mu) : mu_(mu) { mu_.Unlock(); }
+ ~MutexRelock() { mu_.Lock(); }
+
+ MutexRelock(const MutexRelock&) = delete;
+ MutexRelock& operator=(const MutexRelock&) = delete;
+
+ private:
+ absl::Mutex& mu_;
+};
+
+} // namespace
+
+///////////////////////////////////////////////////////////////////////////////
+// Persistent state of the flag data.
+
+class FlagImpl;
+
+class FlagState : public flags_internal::FlagStateInterface {
+ public:
+ template <typename V>
+ FlagState(FlagImpl& flag_impl, const V& v, bool modified,
+ bool on_command_line, int64_t counter)
+ : flag_impl_(flag_impl),
+ value_(v),
+ modified_(modified),
+ on_command_line_(on_command_line),
+ counter_(counter) {}
+
+ ~FlagState() override {
+ if (flag_impl_.ValueStorageKind() != FlagValueStorageKind::kAlignedBuffer)
+ return;
+ flags_internal::Delete(flag_impl_.op_, value_.heap_allocated);
+ }
+
+ private:
+ friend class FlagImpl;
+
+ // Restores the flag to the saved state.
+ void Restore() const override {
+ if (!flag_impl_.RestoreState(*this)) return;
+
+ ABSL_INTERNAL_LOG(INFO,
+ absl::StrCat("Restore saved value of ", flag_impl_.Name(),
+ " to: ", flag_impl_.CurrentValue()));
+ }
+
+ // Flag and saved flag data.
+ FlagImpl& flag_impl_;
+ union SavedValue {
+ explicit SavedValue(void* v) : heap_allocated(v) {}
+ explicit SavedValue(int64_t v) : one_word(v) {}
+ explicit SavedValue(flags_internal::AlignedTwoWords v) : two_words(v) {}
+
+ void* heap_allocated;
+ int64_t one_word;
+ flags_internal::AlignedTwoWords two_words;
+ } value_;
+ bool modified_;
+ bool on_command_line_;
+ int64_t counter_;
+};
+
+///////////////////////////////////////////////////////////////////////////////
+// Flag implementation, which does not depend on flag value type.
+
+DynValueDeleter::DynValueDeleter(FlagOpFn op_arg) : op(op_arg) {}
+
+void DynValueDeleter::operator()(void* ptr) const {
+ if (op == nullptr) return;
+
+ Delete(op, ptr);
+}
+
+void FlagImpl::Init() {
+ new (&data_guard_) absl::Mutex;
+
+ auto def_kind = static_cast<FlagDefaultKind>(def_kind_);
+
+ switch (ValueStorageKind()) {
+ case FlagValueStorageKind::kAlignedBuffer:
+ // For this storage kind the default_value_ always points to gen_func
+ // during initialization.
+ assert(def_kind == FlagDefaultKind::kGenFunc);
+ (*default_value_.gen_func)(AlignedBufferValue());
+ break;
+ case FlagValueStorageKind::kOneWordAtomic: {
+ alignas(int64_t) std::array<char, sizeof(int64_t)> buf{};
+ if (def_kind == FlagDefaultKind::kGenFunc) {
+ (*default_value_.gen_func)(buf.data());
+ } else {
+ assert(def_kind != FlagDefaultKind::kDynamicValue);
+ std::memcpy(buf.data(), &default_value_, Sizeof(op_));
+ }
+ OneWordValue().store(absl::bit_cast<int64_t>(buf),
+ std::memory_order_release);
+ break;
+ }
+ case FlagValueStorageKind::kTwoWordsAtomic: {
+ // For this storage kind the default_value_ always points to gen_func
+ // during initialization.
+ assert(def_kind == FlagDefaultKind::kGenFunc);
+ alignas(AlignedTwoWords) std::array<char, sizeof(AlignedTwoWords)> buf{};
+ (*default_value_.gen_func)(buf.data());
+ auto atomic_value = absl::bit_cast<AlignedTwoWords>(buf);
+ TwoWordsValue().store(atomic_value, std::memory_order_release);
+ break;
+ }
+ }
+}
+
+absl::Mutex* FlagImpl::DataGuard() const {
+ absl::call_once(const_cast<FlagImpl*>(this)->init_control_, &FlagImpl::Init,
+ const_cast<FlagImpl*>(this));
+
+ // data_guard_ is initialized inside Init.
+ return reinterpret_cast<absl::Mutex*>(&data_guard_);
+}
+
+void FlagImpl::AssertValidType(FlagFastTypeId rhs_type_id,
+ const std::type_info* (*gen_rtti)()) const {
+ FlagFastTypeId lhs_type_id = flags_internal::FastTypeId(op_);
+
+ // `rhs_type_id` is the fast type id corresponding to the declaration
+ // visibile at the call site. `lhs_type_id` is the fast type id
+ // corresponding to the type specified in flag definition. They must match
+ // for this operation to be well-defined.
+ if (ABSL_PREDICT_TRUE(lhs_type_id == rhs_type_id)) return;
+
+ const std::type_info* lhs_runtime_type_id =
+ flags_internal::RuntimeTypeId(op_);
+ const std::type_info* rhs_runtime_type_id = (*gen_rtti)();
+
+ if (lhs_runtime_type_id == rhs_runtime_type_id) return;
+
+#if defined(ABSL_FLAGS_INTERNAL_HAS_RTTI)
+ if (*lhs_runtime_type_id == *rhs_runtime_type_id) return;
+#endif
+
+ ABSL_INTERNAL_LOG(
+ FATAL, absl::StrCat("Flag '", Name(),
+ "' is defined as one type and declared as another"));
+}
+
+std::unique_ptr<void, DynValueDeleter> FlagImpl::MakeInitValue() const {
+ void* res = nullptr;
+ switch (DefaultKind()) {
+ case FlagDefaultKind::kDynamicValue:
+ res = flags_internal::Clone(op_, default_value_.dynamic_value);
+ break;
+ case FlagDefaultKind::kGenFunc:
+ res = flags_internal::Alloc(op_);
+ (*default_value_.gen_func)(res);
+ break;
+ default:
+ res = flags_internal::Clone(op_, &default_value_);
+ break;
+ }
+ return {res, DynValueDeleter{op_}};
+}
+
+void FlagImpl::StoreValue(const void* src) {
+ switch (ValueStorageKind()) {
+ case FlagValueStorageKind::kAlignedBuffer:
+ Copy(op_, src, AlignedBufferValue());
+ break;
+ case FlagValueStorageKind::kOneWordAtomic: {
+ int64_t one_word_val = 0;
+ std::memcpy(&one_word_val, src, Sizeof(op_));
+ OneWordValue().store(one_word_val, std::memory_order_release);
+ break;
+ }
+ case FlagValueStorageKind::kTwoWordsAtomic: {
+ AlignedTwoWords two_words_val{0, 0};
+ std::memcpy(&two_words_val, src, Sizeof(op_));
+ TwoWordsValue().store(two_words_val, std::memory_order_release);
+ break;
+ }
+ }
+
+ modified_ = true;
+ ++counter_;
+ InvokeCallback();
+}
+
+absl::string_view FlagImpl::Name() const { return name_; }
+
+std::string FlagImpl::Filename() const {
+ return flags_internal::GetUsageConfig().normalize_filename(filename_);
+}
+
+std::string FlagImpl::Help() const {
+ return HelpSourceKind() == FlagHelpKind::kLiteral ? help_.literal
+ : help_.gen_func();
+}
+
+FlagFastTypeId FlagImpl::TypeId() const {
+ return flags_internal::FastTypeId(op_);
+}
+
+bool FlagImpl::IsSpecifiedOnCommandLine() const {
+ absl::MutexLock l(DataGuard());
+ return on_command_line_;
+}
+
+std::string FlagImpl::DefaultValue() const {
+ absl::MutexLock l(DataGuard());
+
+ auto obj = MakeInitValue();
+ return flags_internal::Unparse(op_, obj.get());
+}
+
+std::string FlagImpl::CurrentValue() const {
+ auto* guard = DataGuard(); // Make sure flag initialized
+ switch (ValueStorageKind()) {
+ case FlagValueStorageKind::kAlignedBuffer: {
+ absl::MutexLock l(guard);
+ return flags_internal::Unparse(op_, AlignedBufferValue());
+ }
+ case FlagValueStorageKind::kOneWordAtomic: {
+ const auto one_word_val =
+ absl::bit_cast<std::array<char, sizeof(int64_t)>>(
+ OneWordValue().load(std::memory_order_acquire));
+ return flags_internal::Unparse(op_, one_word_val.data());
+ }
+ case FlagValueStorageKind::kTwoWordsAtomic: {
+ const auto two_words_val =
+ absl::bit_cast<std::array<char, sizeof(AlignedTwoWords)>>(
+ TwoWordsValue().load(std::memory_order_acquire));
+ return flags_internal::Unparse(op_, two_words_val.data());
+ }
+ }
+
+ return "";
+}
+
+void FlagImpl::SetCallback(const FlagCallbackFunc mutation_callback) {
+ absl::MutexLock l(DataGuard());
+
+ if (callback_ == nullptr) {
+ callback_ = new FlagCallback;
+ }
+ callback_->func = mutation_callback;
+
+ InvokeCallback();
+}
+
+void FlagImpl::InvokeCallback() const {
+ if (!callback_) return;
+
+ // Make a copy of the C-style function pointer that we are about to invoke
+ // before we release the lock guarding it.
+ FlagCallbackFunc cb = callback_->func;
+
+ // If the flag has a mutation callback this function invokes it. While the
+ // callback is being invoked the primary flag's mutex is unlocked and it is
+ // re-locked back after call to callback is completed. Callback invocation is
+ // guarded by flag's secondary mutex instead which prevents concurrent
+ // callback invocation. Note that it is possible for other thread to grab the
+ // primary lock and update flag's value at any time during the callback
+ // invocation. This is by design. Callback can get a value of the flag if
+ // necessary, but it might be different from the value initiated the callback
+ // and it also can be different by the time the callback invocation is
+ // completed. Requires that *primary_lock be held in exclusive mode; it may be
+ // released and reacquired by the implementation.
+ MutexRelock relock(*DataGuard());
+ absl::MutexLock lock(&callback_->guard);
+ cb();
+}
+
+std::unique_ptr<FlagStateInterface> FlagImpl::SaveState() {
+ absl::MutexLock l(DataGuard());
+
+ bool modified = modified_;
+ bool on_command_line = on_command_line_;
+ switch (ValueStorageKind()) {
+ case FlagValueStorageKind::kAlignedBuffer: {
+ return absl::make_unique<FlagState>(
+ *this, flags_internal::Clone(op_, AlignedBufferValue()), modified,
+ on_command_line, counter_);
+ }
+ case FlagValueStorageKind::kOneWordAtomic: {
+ return absl::make_unique<FlagState>(
+ *this, OneWordValue().load(std::memory_order_acquire), modified,
+ on_command_line, counter_);
+ }
+ case FlagValueStorageKind::kTwoWordsAtomic: {
+ return absl::make_unique<FlagState>(
+ *this, TwoWordsValue().load(std::memory_order_acquire), modified,
+ on_command_line, counter_);
+ }
+ }
+ return nullptr;
+}
+
+bool FlagImpl::RestoreState(const FlagState& flag_state) {
+ absl::MutexLock l(DataGuard());
+
+ if (flag_state.counter_ == counter_) {
+ return false;
+ }
+
+ switch (ValueStorageKind()) {
+ case FlagValueStorageKind::kAlignedBuffer:
+ StoreValue(flag_state.value_.heap_allocated);
+ break;
+ case FlagValueStorageKind::kOneWordAtomic:
+ StoreValue(&flag_state.value_.one_word);
+ break;
+ case FlagValueStorageKind::kTwoWordsAtomic:
+ StoreValue(&flag_state.value_.two_words);
+ break;
+ }
+
+ modified_ = flag_state.modified_;
+ on_command_line_ = flag_state.on_command_line_;
+
+ return true;
+}
+
+template <typename StorageT>
+StorageT* FlagImpl::OffsetValue() const {
+ char* p = reinterpret_cast<char*>(const_cast<FlagImpl*>(this));
+ // The offset is deduced via Flag value type specific op_.
+ size_t offset = flags_internal::ValueOffset(op_);
+
+ return reinterpret_cast<StorageT*>(p + offset);
+}
+
+void* FlagImpl::AlignedBufferValue() const {
+ assert(ValueStorageKind() == FlagValueStorageKind::kAlignedBuffer);
+ return OffsetValue<void>();
+}
+
+std::atomic<int64_t>& FlagImpl::OneWordValue() const {
+ assert(ValueStorageKind() == FlagValueStorageKind::kOneWordAtomic);
+ return OffsetValue<FlagOneWordValue>()->value;
+}
+
+std::atomic<AlignedTwoWords>& FlagImpl::TwoWordsValue() const {
+ assert(ValueStorageKind() == FlagValueStorageKind::kTwoWordsAtomic);
+ return OffsetValue<FlagTwoWordsValue>()->value;
+}
+
+// Attempts to parse supplied `value` string using parsing routine in the `flag`
+// argument. If parsing successful, this function replaces the dst with newly
+// parsed value. In case if any error is encountered in either step, the error
+// message is stored in 'err'
+std::unique_ptr<void, DynValueDeleter> FlagImpl::TryParse(
+ absl::string_view value, std::string& err) const {
+ std::unique_ptr<void, DynValueDeleter> tentative_value = MakeInitValue();
+
+ std::string parse_err;
+ if (!flags_internal::Parse(op_, value, tentative_value.get(), &parse_err)) {
+ absl::string_view err_sep = parse_err.empty() ? "" : "; ";
+ err = absl::StrCat("Illegal value '", value, "' specified for flag '",
+ Name(), "'", err_sep, parse_err);
+ return nullptr;
+ }
+
+ return tentative_value;
+}
+
+void FlagImpl::Read(void* dst) const {
+ auto* guard = DataGuard(); // Make sure flag initialized
+ switch (ValueStorageKind()) {
+ case FlagValueStorageKind::kAlignedBuffer: {
+ absl::MutexLock l(guard);
+ flags_internal::CopyConstruct(op_, AlignedBufferValue(), dst);
+ break;
+ }
+ case FlagValueStorageKind::kOneWordAtomic: {
+ const int64_t one_word_val =
+ OneWordValue().load(std::memory_order_acquire);
+ std::memcpy(dst, &one_word_val, Sizeof(op_));
+ break;
+ }
+ case FlagValueStorageKind::kTwoWordsAtomic: {
+ const AlignedTwoWords two_words_val =
+ TwoWordsValue().load(std::memory_order_acquire);
+ std::memcpy(dst, &two_words_val, Sizeof(op_));
+ break;
+ }
+ }
+}
+
+void FlagImpl::Write(const void* src) {
+ absl::MutexLock l(DataGuard());
+
+ if (ShouldValidateFlagValue(flags_internal::FastTypeId(op_))) {
+ std::unique_ptr<void, DynValueDeleter> obj{flags_internal::Clone(op_, src),
+ DynValueDeleter{op_}};
+ std::string ignored_error;
+ std::string src_as_str = flags_internal::Unparse(op_, src);
+ if (!flags_internal::Parse(op_, src_as_str, obj.get(), &ignored_error)) {
+ ABSL_INTERNAL_LOG(ERROR, absl::StrCat("Attempt to set flag '", Name(),
+ "' to invalid value ", src_as_str));
+ }
+ }
+
+ StoreValue(src);
+}
+
+// Sets the value of the flag based on specified string `value`. If the flag
+// was successfully set to new value, it returns true. Otherwise, sets `err`
+// to indicate the error, leaves the flag unchanged, and returns false. There
+// are three ways to set the flag's value:
+// * Update the current flag value
+// * Update the flag's default value
+// * Update the current flag value if it was never set before
+// The mode is selected based on 'set_mode' parameter.
+bool FlagImpl::ParseFrom(absl::string_view value, FlagSettingMode set_mode,
+ ValueSource source, std::string& err) {
+ absl::MutexLock l(DataGuard());
+
+ switch (set_mode) {
+ case SET_FLAGS_VALUE: {
+ // set or modify the flag's value
+ auto tentative_value = TryParse(value, err);
+ if (!tentative_value) return false;
+
+ StoreValue(tentative_value.get());
+
+ if (source == kCommandLine) {
+ on_command_line_ = true;
+ }
+ break;
+ }
+ case SET_FLAG_IF_DEFAULT: {
+ // set the flag's value, but only if it hasn't been set by someone else
+ if (modified_) {
+ // TODO(rogeeff): review and fix this semantic. Currently we do not fail
+ // in this case if flag is modified. This is misleading since the flag's
+ // value is not updated even though we return true.
+ // *err = absl::StrCat(Name(), " is already set to ",
+ // CurrentValue(), "\n");
+ // return false;
+ return true;
+ }
+ auto tentative_value = TryParse(value, err);
+ if (!tentative_value) return false;
+
+ StoreValue(tentative_value.get());
+ break;
+ }
+ case SET_FLAGS_DEFAULT: {
+ auto tentative_value = TryParse(value, err);
+ if (!tentative_value) return false;
+
+ if (DefaultKind() == FlagDefaultKind::kDynamicValue) {
+ void* old_value = default_value_.dynamic_value;
+ default_value_.dynamic_value = tentative_value.release();
+ tentative_value.reset(old_value);
+ } else {
+ default_value_.dynamic_value = tentative_value.release();
+ def_kind_ = static_cast<uint8_t>(FlagDefaultKind::kDynamicValue);
+ }
+
+ if (!modified_) {
+ // Need to set both default value *and* current, in this case.
+ StoreValue(default_value_.dynamic_value);
+ modified_ = false;
+ }
+ break;
+ }
+ }
+
+ return true;
+}
+
+void FlagImpl::CheckDefaultValueParsingRoundtrip() const {
+ std::string v = DefaultValue();
+
+ absl::MutexLock lock(DataGuard());
+
+ auto dst = MakeInitValue();
+ std::string error;
+ if (!flags_internal::Parse(op_, v, dst.get(), &error)) {
+ ABSL_INTERNAL_LOG(
+ FATAL,
+ absl::StrCat("Flag ", Name(), " (from ", Filename(),
+ "): string form of default value '", v,
+ "' could not be parsed; error=", error));
+ }
+
+ // We do not compare dst to def since parsing/unparsing may make
+ // small changes, e.g., precision loss for floating point types.
+}
+
+bool FlagImpl::ValidateInputValue(absl::string_view value) const {
+ absl::MutexLock l(DataGuard());
+
+ auto obj = MakeInitValue();
+ std::string ignored_error;
+ return flags_internal::Parse(op_, value, obj.get(), &ignored_error);
+}
+
+} // namespace flags_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/flags/internal/flag.h b/third_party/abseil/src/absl/flags/internal/flag.h
new file mode 100644
index 0000000..370d8a0
--- /dev/null
+++ b/third_party/abseil/src/absl/flags/internal/flag.h
@@ -0,0 +1,775 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_FLAGS_INTERNAL_FLAG_H_
+#define ABSL_FLAGS_INTERNAL_FLAG_H_
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include <atomic>
+#include <cstring>
+#include <memory>
+#include <new>
+#include <string>
+#include <type_traits>
+#include <typeinfo>
+
+#include "absl/base/attributes.h"
+#include "absl/base/call_once.h"
+#include "absl/base/config.h"
+#include "absl/base/optimization.h"
+#include "absl/base/thread_annotations.h"
+#include "absl/flags/commandlineflag.h"
+#include "absl/flags/config.h"
+#include "absl/flags/internal/commandlineflag.h"
+#include "absl/flags/internal/registry.h"
+#include "absl/flags/marshalling.h"
+#include "absl/meta/type_traits.h"
+#include "absl/strings/string_view.h"
+#include "absl/synchronization/mutex.h"
+#include "absl/utility/utility.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+///////////////////////////////////////////////////////////////////////////////
+// Forward declaration of absl::Flag<T> public API.
+namespace flags_internal {
+template <typename T>
+class Flag;
+} // namespace flags_internal
+
+#if defined(_MSC_VER) && !defined(__clang__)
+template <typename T>
+class Flag;
+#else
+template <typename T>
+using Flag = flags_internal::Flag<T>;
+#endif
+
+template <typename T>
+ABSL_MUST_USE_RESULT T GetFlag(const absl::Flag<T>& flag);
+
+template <typename T>
+void SetFlag(absl::Flag<T>* flag, const T& v);
+
+template <typename T, typename V>
+void SetFlag(absl::Flag<T>* flag, const V& v);
+
+template <typename U>
+const CommandLineFlag& GetFlagReflectionHandle(const absl::Flag<U>& f);
+
+///////////////////////////////////////////////////////////////////////////////
+// Flag value type operations, eg., parsing, copying, etc. are provided
+// by function specific to that type with a signature matching FlagOpFn.
+
+namespace flags_internal {
+
+enum class FlagOp {
+ kAlloc,
+ kDelete,
+ kCopy,
+ kCopyConstruct,
+ kSizeof,
+ kFastTypeId,
+ kRuntimeTypeId,
+ kParse,
+ kUnparse,
+ kValueOffset,
+};
+using FlagOpFn = void* (*)(FlagOp, const void*, void*, void*);
+
+// Forward declaration for Flag value specific operations.
+template <typename T>
+void* FlagOps(FlagOp op, const void* v1, void* v2, void* v3);
+
+// Allocate aligned memory for a flag value.
+inline void* Alloc(FlagOpFn op) {
+ return op(FlagOp::kAlloc, nullptr, nullptr, nullptr);
+}
+// Deletes memory interpreting obj as flag value type pointer.
+inline void Delete(FlagOpFn op, void* obj) {
+ op(FlagOp::kDelete, nullptr, obj, nullptr);
+}
+// Copies src to dst interpreting as flag value type pointers.
+inline void Copy(FlagOpFn op, const void* src, void* dst) {
+ op(FlagOp::kCopy, src, dst, nullptr);
+}
+// Construct a copy of flag value in a location pointed by dst
+// based on src - pointer to the flag's value.
+inline void CopyConstruct(FlagOpFn op, const void* src, void* dst) {
+ op(FlagOp::kCopyConstruct, src, dst, nullptr);
+}
+// Makes a copy of flag value pointed by obj.
+inline void* Clone(FlagOpFn op, const void* obj) {
+ void* res = flags_internal::Alloc(op);
+ flags_internal::CopyConstruct(op, obj, res);
+ return res;
+}
+// Returns true if parsing of input text is successfull.
+inline bool Parse(FlagOpFn op, absl::string_view text, void* dst,
+ std::string* error) {
+ return op(FlagOp::kParse, &text, dst, error) != nullptr;
+}
+// Returns string representing supplied value.
+inline std::string Unparse(FlagOpFn op, const void* val) {
+ std::string result;
+ op(FlagOp::kUnparse, val, &result, nullptr);
+ return result;
+}
+// Returns size of flag value type.
+inline size_t Sizeof(FlagOpFn op) {
+ // This sequence of casts reverses the sequence from
+ // `flags_internal::FlagOps()`
+ return static_cast<size_t>(reinterpret_cast<intptr_t>(
+ op(FlagOp::kSizeof, nullptr, nullptr, nullptr)));
+}
+// Returns fast type id coresponding to the value type.
+inline FlagFastTypeId FastTypeId(FlagOpFn op) {
+ return reinterpret_cast<FlagFastTypeId>(
+ op(FlagOp::kFastTypeId, nullptr, nullptr, nullptr));
+}
+// Returns fast type id coresponding to the value type.
+inline const std::type_info* RuntimeTypeId(FlagOpFn op) {
+ return reinterpret_cast<const std::type_info*>(
+ op(FlagOp::kRuntimeTypeId, nullptr, nullptr, nullptr));
+}
+// Returns offset of the field value_ from the field impl_ inside of
+// absl::Flag<T> data. Given FlagImpl pointer p you can get the
+// location of the corresponding value as:
+// reinterpret_cast<char*>(p) + ValueOffset().
+inline ptrdiff_t ValueOffset(FlagOpFn op) {
+ // This sequence of casts reverses the sequence from
+ // `flags_internal::FlagOps()`
+ return static_cast<ptrdiff_t>(reinterpret_cast<intptr_t>(
+ op(FlagOp::kValueOffset, nullptr, nullptr, nullptr)));
+}
+
+// Returns an address of RTTI's typeid(T).
+template <typename T>
+inline const std::type_info* GenRuntimeTypeId() {
+#if defined(ABSL_FLAGS_INTERNAL_HAS_RTTI)
+ return &typeid(T);
+#else
+ return nullptr;
+#endif
+}
+
+///////////////////////////////////////////////////////////////////////////////
+// Flag help auxiliary structs.
+
+// This is help argument for absl::Flag encapsulating the string literal pointer
+// or pointer to function generating it as well as enum descriminating two
+// cases.
+using HelpGenFunc = std::string (*)();
+
+template <size_t N>
+struct FixedCharArray {
+ char value[N];
+
+ template <size_t... I>
+ static constexpr FixedCharArray<N> FromLiteralString(
+ absl::string_view str, absl::index_sequence<I...>) {
+ return (void)str, FixedCharArray<N>({{str[I]..., '\0'}});
+ }
+};
+
+template <typename Gen, size_t N = Gen::Value().size()>
+constexpr FixedCharArray<N + 1> HelpStringAsArray(int) {
+ return FixedCharArray<N + 1>::FromLiteralString(
+ Gen::Value(), absl::make_index_sequence<N>{});
+}
+
+template <typename Gen>
+constexpr std::false_type HelpStringAsArray(char) {
+ return std::false_type{};
+}
+
+union FlagHelpMsg {
+ constexpr explicit FlagHelpMsg(const char* help_msg) : literal(help_msg) {}
+ constexpr explicit FlagHelpMsg(HelpGenFunc help_gen) : gen_func(help_gen) {}
+
+ const char* literal;
+ HelpGenFunc gen_func;
+};
+
+enum class FlagHelpKind : uint8_t { kLiteral = 0, kGenFunc = 1 };
+
+struct FlagHelpArg {
+ FlagHelpMsg source;
+ FlagHelpKind kind;
+};
+
+extern const char kStrippedFlagHelp[];
+
+// These two HelpArg overloads allows us to select at compile time one of two
+// way to pass Help argument to absl::Flag. We'll be passing
+// AbslFlagHelpGenFor##name as Gen and integer 0 as a single argument to prefer
+// first overload if possible. If help message is evaluatable on constexpr
+// context We'll be able to make FixedCharArray out of it and we'll choose first
+// overload. In this case the help message expression is immediately evaluated
+// and is used to construct the absl::Flag. No additionl code is generated by
+// ABSL_FLAG Otherwise SFINAE kicks in and first overload is dropped from the
+// consideration, in which case the second overload will be used. The second
+// overload does not attempt to evaluate the help message expression
+// immediately and instead delays the evaluation by returing the function
+// pointer (&T::NonConst) genering the help message when necessary. This is
+// evaluatable in constexpr context, but the cost is an extra function being
+// generated in the ABSL_FLAG code.
+template <typename Gen, size_t N>
+constexpr FlagHelpArg HelpArg(const FixedCharArray<N>& value) {
+ return {FlagHelpMsg(value.value), FlagHelpKind::kLiteral};
+}
+
+template <typename Gen>
+constexpr FlagHelpArg HelpArg(std::false_type) {
+ return {FlagHelpMsg(&Gen::NonConst), FlagHelpKind::kGenFunc};
+}
+
+///////////////////////////////////////////////////////////////////////////////
+// Flag default value auxiliary structs.
+
+// Signature for the function generating the initial flag value (usually
+// based on default value supplied in flag's definition)
+using FlagDfltGenFunc = void (*)(void*);
+
+union FlagDefaultSrc {
+ constexpr explicit FlagDefaultSrc(FlagDfltGenFunc gen_func_arg)
+ : gen_func(gen_func_arg) {}
+
+#define ABSL_FLAGS_INTERNAL_DFLT_FOR_TYPE(T, name) \
+ T name##_value; \
+ constexpr explicit FlagDefaultSrc(T value) : name##_value(value) {} // NOLINT
+ ABSL_FLAGS_INTERNAL_BUILTIN_TYPES(ABSL_FLAGS_INTERNAL_DFLT_FOR_TYPE)
+#undef ABSL_FLAGS_INTERNAL_DFLT_FOR_TYPE
+
+ void* dynamic_value;
+ FlagDfltGenFunc gen_func;
+};
+
+enum class FlagDefaultKind : uint8_t {
+ kDynamicValue = 0,
+ kGenFunc = 1,
+ kOneWord = 2 // for default values UP to one word in size
+};
+
+struct FlagDefaultArg {
+ FlagDefaultSrc source;
+ FlagDefaultKind kind;
+};
+
+// This struct and corresponding overload to InitDefaultValue are used to
+// facilitate usage of {} as default value in ABSL_FLAG macro.
+// TODO(rogeeff): Fix handling types with explicit constructors.
+struct EmptyBraces {};
+
+template <typename T>
+constexpr T InitDefaultValue(T t) {
+ return t;
+}
+
+template <typename T>
+constexpr T InitDefaultValue(EmptyBraces) {
+ return T{};
+}
+
+template <typename ValueT, typename GenT,
+ typename std::enable_if<std::is_integral<ValueT>::value, int>::type =
+ (GenT{}, 0)>
+constexpr FlagDefaultArg DefaultArg(int) {
+ return {FlagDefaultSrc(GenT{}.value), FlagDefaultKind::kOneWord};
+}
+
+template <typename ValueT, typename GenT>
+constexpr FlagDefaultArg DefaultArg(char) {
+ return {FlagDefaultSrc(&GenT::Gen), FlagDefaultKind::kGenFunc};
+}
+
+///////////////////////////////////////////////////////////////////////////////
+// Flag current value auxiliary structs.
+
+constexpr int64_t UninitializedFlagValue() { return 0xababababababababll; }
+
+template <typename T>
+using FlagUseOneWordStorage = std::integral_constant<
+ bool, absl::type_traits_internal::is_trivially_copyable<T>::value &&
+ (sizeof(T) <= 8)>;
+
+#if defined(ABSL_FLAGS_INTERNAL_ATOMIC_DOUBLE_WORD)
+// Clang does not always produce cmpxchg16b instruction when alignment of a 16
+// bytes type is not 16.
+struct alignas(16) AlignedTwoWords {
+ int64_t first;
+ int64_t second;
+
+ bool IsInitialized() const {
+ return first != flags_internal::UninitializedFlagValue();
+ }
+};
+
+template <typename T>
+using FlagUseTwoWordsStorage = std::integral_constant<
+ bool, absl::type_traits_internal::is_trivially_copyable<T>::value &&
+ (sizeof(T) > 8) && (sizeof(T) <= 16)>;
+#else
+// This is actually unused and only here to avoid ifdefs in other palces.
+struct AlignedTwoWords {
+ constexpr AlignedTwoWords() noexcept : dummy() {}
+ constexpr AlignedTwoWords(int64_t, int64_t) noexcept : dummy() {}
+ char dummy;
+
+ bool IsInitialized() const {
+ std::abort();
+ return true;
+ }
+};
+
+// This trait should be type dependent, otherwise SFINAE below will fail
+template <typename T>
+using FlagUseTwoWordsStorage =
+ std::integral_constant<bool, sizeof(T) != sizeof(T)>;
+#endif
+
+template <typename T>
+using FlagUseBufferStorage =
+ std::integral_constant<bool, !FlagUseOneWordStorage<T>::value &&
+ !FlagUseTwoWordsStorage<T>::value>;
+
+enum class FlagValueStorageKind : uint8_t {
+ kAlignedBuffer = 0,
+ kOneWordAtomic = 1,
+ kTwoWordsAtomic = 2
+};
+
+template <typename T>
+static constexpr FlagValueStorageKind StorageKind() {
+ return FlagUseBufferStorage<T>::value
+ ? FlagValueStorageKind::kAlignedBuffer
+ : FlagUseOneWordStorage<T>::value
+ ? FlagValueStorageKind::kOneWordAtomic
+ : FlagValueStorageKind::kTwoWordsAtomic;
+}
+
+struct FlagOneWordValue {
+ constexpr FlagOneWordValue() : value(UninitializedFlagValue()) {}
+
+ std::atomic<int64_t> value;
+};
+
+struct FlagTwoWordsValue {
+ constexpr FlagTwoWordsValue()
+ : value(AlignedTwoWords{UninitializedFlagValue(), 0}) {}
+
+ std::atomic<AlignedTwoWords> value;
+};
+
+template <typename T,
+ FlagValueStorageKind Kind = flags_internal::StorageKind<T>()>
+struct FlagValue;
+
+template <typename T>
+struct FlagValue<T, FlagValueStorageKind::kAlignedBuffer> {
+ bool Get(T&) const { return false; }
+
+ alignas(T) char value[sizeof(T)];
+};
+
+template <typename T>
+struct FlagValue<T, FlagValueStorageKind::kOneWordAtomic> : FlagOneWordValue {
+ bool Get(T& dst) const {
+ int64_t one_word_val = value.load(std::memory_order_acquire);
+ if (ABSL_PREDICT_FALSE(one_word_val == UninitializedFlagValue())) {
+ return false;
+ }
+ std::memcpy(&dst, static_cast<const void*>(&one_word_val), sizeof(T));
+ return true;
+ }
+};
+
+template <typename T>
+struct FlagValue<T, FlagValueStorageKind::kTwoWordsAtomic> : FlagTwoWordsValue {
+ bool Get(T& dst) const {
+ AlignedTwoWords two_words_val = value.load(std::memory_order_acquire);
+ if (ABSL_PREDICT_FALSE(!two_words_val.IsInitialized())) {
+ return false;
+ }
+ std::memcpy(&dst, static_cast<const void*>(&two_words_val), sizeof(T));
+ return true;
+ }
+};
+
+///////////////////////////////////////////////////////////////////////////////
+// Flag callback auxiliary structs.
+
+// Signature for the mutation callback used by watched Flags
+// The callback is noexcept.
+// TODO(rogeeff): add noexcept after C++17 support is added.
+using FlagCallbackFunc = void (*)();
+
+struct FlagCallback {
+ FlagCallbackFunc func;
+ absl::Mutex guard; // Guard for concurrent callback invocations.
+};
+
+///////////////////////////////////////////////////////////////////////////////
+// Flag implementation, which does not depend on flag value type.
+// The class encapsulates the Flag's data and access to it.
+
+struct DynValueDeleter {
+ explicit DynValueDeleter(FlagOpFn op_arg = nullptr);
+ void operator()(void* ptr) const;
+
+ FlagOpFn op;
+};
+
+class FlagState;
+
+class FlagImpl final : public CommandLineFlag {
+ public:
+ constexpr FlagImpl(const char* name, const char* filename, FlagOpFn op,
+ FlagHelpArg help, FlagValueStorageKind value_kind,
+ FlagDefaultArg default_arg)
+ : name_(name),
+ filename_(filename),
+ op_(op),
+ help_(help.source),
+ help_source_kind_(static_cast<uint8_t>(help.kind)),
+ value_storage_kind_(static_cast<uint8_t>(value_kind)),
+ def_kind_(static_cast<uint8_t>(default_arg.kind)),
+ modified_(false),
+ on_command_line_(false),
+ counter_(0),
+ callback_(nullptr),
+ default_value_(default_arg.source),
+ data_guard_{} {}
+
+ // Constant access methods
+ void Read(void* dst) const override ABSL_LOCKS_EXCLUDED(*DataGuard());
+
+ // Mutating access methods
+ void Write(const void* src) ABSL_LOCKS_EXCLUDED(*DataGuard());
+
+ // Interfaces to operate on callbacks.
+ void SetCallback(const FlagCallbackFunc mutation_callback)
+ ABSL_LOCKS_EXCLUDED(*DataGuard());
+ void InvokeCallback() const ABSL_EXCLUSIVE_LOCKS_REQUIRED(*DataGuard());
+
+ // Used in read/write operations to validate source/target has correct type.
+ // For example if flag is declared as absl::Flag<int> FLAGS_foo, a call to
+ // absl::GetFlag(FLAGS_foo) validates that the type of FLAGS_foo is indeed
+ // int. To do that we pass the "assumed" type id (which is deduced from type
+ // int) as an argument `type_id`, which is in turn is validated against the
+ // type id stored in flag object by flag definition statement.
+ void AssertValidType(FlagFastTypeId type_id,
+ const std::type_info* (*gen_rtti)()) const;
+
+ private:
+ template <typename T>
+ friend class Flag;
+ friend class FlagState;
+
+ // Ensures that `data_guard_` is initialized and returns it.
+ absl::Mutex* DataGuard() const
+ ABSL_LOCK_RETURNED(reinterpret_cast<absl::Mutex*>(data_guard_));
+ // Returns heap allocated value of type T initialized with default value.
+ std::unique_ptr<void, DynValueDeleter> MakeInitValue() const
+ ABSL_EXCLUSIVE_LOCKS_REQUIRED(*DataGuard());
+ // Flag initialization called via absl::call_once.
+ void Init();
+
+ // Offset value access methods. One per storage kind. These methods to not
+ // respect const correctness, so be very carefull using them.
+
+ // This is a shared helper routine which encapsulates most of the magic. Since
+ // it is only used inside the three routines below, which are defined in
+ // flag.cc, we can define it in that file as well.
+ template <typename StorageT>
+ StorageT* OffsetValue() const;
+ // This is an accessor for a value stored in an aligned buffer storage.
+ // Returns a mutable pointer to the start of a buffer.
+ void* AlignedBufferValue() const;
+ // This is an accessor for a value stored as one word atomic. Returns a
+ // mutable reference to an atomic value.
+ std::atomic<int64_t>& OneWordValue() const;
+ // This is an accessor for a value stored as two words atomic. Returns a
+ // mutable reference to an atomic value.
+ std::atomic<AlignedTwoWords>& TwoWordsValue() const;
+
+ // Attempts to parse supplied `value` string. If parsing is successful,
+ // returns new value. Otherwise returns nullptr.
+ std::unique_ptr<void, DynValueDeleter> TryParse(absl::string_view value,
+ std::string& err) const
+ ABSL_EXCLUSIVE_LOCKS_REQUIRED(*DataGuard());
+ // Stores the flag value based on the pointer to the source.
+ void StoreValue(const void* src) ABSL_EXCLUSIVE_LOCKS_REQUIRED(*DataGuard());
+
+ FlagHelpKind HelpSourceKind() const {
+ return static_cast<FlagHelpKind>(help_source_kind_);
+ }
+ FlagValueStorageKind ValueStorageKind() const {
+ return static_cast<FlagValueStorageKind>(value_storage_kind_);
+ }
+ FlagDefaultKind DefaultKind() const
+ ABSL_EXCLUSIVE_LOCKS_REQUIRED(*DataGuard()) {
+ return static_cast<FlagDefaultKind>(def_kind_);
+ }
+
+ // CommandLineFlag interface implementation
+ absl::string_view Name() const override;
+ std::string Filename() const override;
+ std::string Help() const override;
+ FlagFastTypeId TypeId() const override;
+ bool IsSpecifiedOnCommandLine() const override
+ ABSL_LOCKS_EXCLUDED(*DataGuard());
+ std::string DefaultValue() const override ABSL_LOCKS_EXCLUDED(*DataGuard());
+ std::string CurrentValue() const override ABSL_LOCKS_EXCLUDED(*DataGuard());
+ bool ValidateInputValue(absl::string_view value) const override
+ ABSL_LOCKS_EXCLUDED(*DataGuard());
+ void CheckDefaultValueParsingRoundtrip() const override
+ ABSL_LOCKS_EXCLUDED(*DataGuard());
+
+ // Interfaces to save and restore flags to/from persistent state.
+ // Returns current flag state or nullptr if flag does not support
+ // saving and restoring a state.
+ std::unique_ptr<FlagStateInterface> SaveState() override
+ ABSL_LOCKS_EXCLUDED(*DataGuard());
+
+ // Restores the flag state to the supplied state object. If there is
+ // nothing to restore returns false. Otherwise returns true.
+ bool RestoreState(const FlagState& flag_state)
+ ABSL_LOCKS_EXCLUDED(*DataGuard());
+
+ bool ParseFrom(absl::string_view value, FlagSettingMode set_mode,
+ ValueSource source, std::string& error) override
+ ABSL_LOCKS_EXCLUDED(*DataGuard());
+
+ // Immutable flag's state.
+
+ // Flags name passed to ABSL_FLAG as second arg.
+ const char* const name_;
+ // The file name where ABSL_FLAG resides.
+ const char* const filename_;
+ // Type-specific operations "vtable".
+ const FlagOpFn op_;
+ // Help message literal or function to generate it.
+ const FlagHelpMsg help_;
+ // Indicates if help message was supplied as literal or generator func.
+ const uint8_t help_source_kind_ : 1;
+ // Kind of storage this flag is using for the flag's value.
+ const uint8_t value_storage_kind_ : 2;
+
+ uint8_t : 0; // The bytes containing the const bitfields must not be
+ // shared with bytes containing the mutable bitfields.
+
+ // Mutable flag's state (guarded by `data_guard_`).
+
+ // def_kind_ is not guard by DataGuard() since it is accessed in Init without
+ // locks.
+ uint8_t def_kind_ : 2;
+ // Has this flag's value been modified?
+ bool modified_ : 1 ABSL_GUARDED_BY(*DataGuard());
+ // Has this flag been specified on command line.
+ bool on_command_line_ : 1 ABSL_GUARDED_BY(*DataGuard());
+
+ // Unique tag for absl::call_once call to initialize this flag.
+ absl::once_flag init_control_;
+
+ // Mutation counter
+ int64_t counter_ ABSL_GUARDED_BY(*DataGuard());
+ // Optional flag's callback and absl::Mutex to guard the invocations.
+ FlagCallback* callback_ ABSL_GUARDED_BY(*DataGuard());
+ // Either a pointer to the function generating the default value based on the
+ // value specified in ABSL_FLAG or pointer to the dynamically set default
+ // value via SetCommandLineOptionWithMode. def_kind_ is used to distinguish
+ // these two cases.
+ FlagDefaultSrc default_value_;
+
+ // This is reserved space for an absl::Mutex to guard flag data. It will be
+ // initialized in FlagImpl::Init via placement new.
+ // We can't use "absl::Mutex data_guard_", since this class is not literal.
+ // We do not want to use "absl::Mutex* data_guard_", since this would require
+ // heap allocation during initialization, which is both slows program startup
+ // and can fail. Using reserved space + placement new allows us to avoid both
+ // problems.
+ alignas(absl::Mutex) mutable char data_guard_[sizeof(absl::Mutex)];
+};
+
+///////////////////////////////////////////////////////////////////////////////
+// The Flag object parameterized by the flag's value type. This class implements
+// flag reflection handle interface.
+
+template <typename T>
+class Flag {
+ public:
+ constexpr Flag(const char* name, const char* filename, FlagHelpArg help,
+ const FlagDefaultArg default_arg)
+ : impl_(name, filename, &FlagOps<T>, help,
+ flags_internal::StorageKind<T>(), default_arg),
+ value_() {}
+
+ // CommandLineFlag interface
+ absl::string_view Name() const { return impl_.Name(); }
+ std::string Filename() const { return impl_.Filename(); }
+ std::string Help() const { return impl_.Help(); }
+ // Do not use. To be removed.
+ bool IsSpecifiedOnCommandLine() const {
+ return impl_.IsSpecifiedOnCommandLine();
+ }
+ std::string DefaultValue() const { return impl_.DefaultValue(); }
+ std::string CurrentValue() const { return impl_.CurrentValue(); }
+
+ private:
+ template <typename, bool>
+ friend class FlagRegistrar;
+ friend class FlagImplPeer;
+
+ T Get() const {
+ // See implementation notes in CommandLineFlag::Get().
+ union U {
+ T value;
+ U() {}
+ ~U() { value.~T(); }
+ };
+ U u;
+
+#if !defined(NDEBUG)
+ impl_.AssertValidType(base_internal::FastTypeId<T>(), &GenRuntimeTypeId<T>);
+#endif
+
+ if (!value_.Get(u.value)) impl_.Read(&u.value);
+ return std::move(u.value);
+ }
+ void Set(const T& v) {
+ impl_.AssertValidType(base_internal::FastTypeId<T>(), &GenRuntimeTypeId<T>);
+ impl_.Write(&v);
+ }
+
+ // Access to the reflection.
+ const CommandLineFlag& Reflect() const { return impl_; }
+
+ // Flag's data
+ // The implementation depends on value_ field to be placed exactly after the
+ // impl_ field, so that impl_ can figure out the offset to the value and
+ // access it.
+ FlagImpl impl_;
+ FlagValue<T> value_;
+};
+
+///////////////////////////////////////////////////////////////////////////////
+// Trampoline for friend access
+
+class FlagImplPeer {
+ public:
+ template <typename T, typename FlagType>
+ static T InvokeGet(const FlagType& flag) {
+ return flag.Get();
+ }
+ template <typename FlagType, typename T>
+ static void InvokeSet(FlagType& flag, const T& v) {
+ flag.Set(v);
+ }
+ template <typename FlagType>
+ static const CommandLineFlag& InvokeReflect(const FlagType& f) {
+ return f.Reflect();
+ }
+};
+
+///////////////////////////////////////////////////////////////////////////////
+// Implementation of Flag value specific operations routine.
+template <typename T>
+void* FlagOps(FlagOp op, const void* v1, void* v2, void* v3) {
+ switch (op) {
+ case FlagOp::kAlloc: {
+ std::allocator<T> alloc;
+ return std::allocator_traits<std::allocator<T>>::allocate(alloc, 1);
+ }
+ case FlagOp::kDelete: {
+ T* p = static_cast<T*>(v2);
+ p->~T();
+ std::allocator<T> alloc;
+ std::allocator_traits<std::allocator<T>>::deallocate(alloc, p, 1);
+ return nullptr;
+ }
+ case FlagOp::kCopy:
+ *static_cast<T*>(v2) = *static_cast<const T*>(v1);
+ return nullptr;
+ case FlagOp::kCopyConstruct:
+ new (v2) T(*static_cast<const T*>(v1));
+ return nullptr;
+ case FlagOp::kSizeof:
+ return reinterpret_cast<void*>(static_cast<uintptr_t>(sizeof(T)));
+ case FlagOp::kFastTypeId:
+ return const_cast<void*>(base_internal::FastTypeId<T>());
+ case FlagOp::kRuntimeTypeId:
+ return const_cast<std::type_info*>(GenRuntimeTypeId<T>());
+ case FlagOp::kParse: {
+ // Initialize the temporary instance of type T based on current value in
+ // destination (which is going to be flag's default value).
+ T temp(*static_cast<T*>(v2));
+ if (!absl::ParseFlag<T>(*static_cast<const absl::string_view*>(v1), &temp,
+ static_cast<std::string*>(v3))) {
+ return nullptr;
+ }
+ *static_cast<T*>(v2) = std::move(temp);
+ return v2;
+ }
+ case FlagOp::kUnparse:
+ *static_cast<std::string*>(v2) =
+ absl::UnparseFlag<T>(*static_cast<const T*>(v1));
+ return nullptr;
+ case FlagOp::kValueOffset: {
+ // Round sizeof(FlagImp) to a multiple of alignof(FlagValue<T>) to get the
+ // offset of the data.
+ ptrdiff_t round_to = alignof(FlagValue<T>);
+ ptrdiff_t offset =
+ (sizeof(FlagImpl) + round_to - 1) / round_to * round_to;
+ return reinterpret_cast<void*>(offset);
+ }
+ }
+ return nullptr;
+}
+
+///////////////////////////////////////////////////////////////////////////////
+// This class facilitates Flag object registration and tail expression-based
+// flag definition, for example:
+// ABSL_FLAG(int, foo, 42, "Foo help").OnUpdate(NotifyFooWatcher);
+struct FlagRegistrarEmpty {};
+template <typename T, bool do_register>
+class FlagRegistrar {
+ public:
+ explicit FlagRegistrar(Flag<T>& flag) : flag_(flag) {
+ if (do_register) flags_internal::RegisterCommandLineFlag(flag_.impl_);
+ }
+
+ FlagRegistrar OnUpdate(FlagCallbackFunc cb) && {
+ flag_.impl_.SetCallback(cb);
+ return *this;
+ }
+
+ // Make the registrar "die" gracefully as an empty struct on a line where
+ // registration happens. Registrar objects are intended to live only as
+ // temporary.
+ operator FlagRegistrarEmpty() const { return {}; } // NOLINT
+
+ private:
+ Flag<T>& flag_; // Flag being registered (not owned).
+};
+
+} // namespace flags_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_FLAGS_INTERNAL_FLAG_H_
diff --git a/third_party/abseil/src/absl/flags/internal/parse.h b/third_party/abseil/src/absl/flags/internal/parse.h
new file mode 100644
index 0000000..de706c8
--- /dev/null
+++ b/third_party/abseil/src/absl/flags/internal/parse.h
@@ -0,0 +1,59 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_FLAGS_INTERNAL_PARSE_H_
+#define ABSL_FLAGS_INTERNAL_PARSE_H_
+
+#include <string>
+#include <vector>
+
+#include "absl/base/config.h"
+#include "absl/flags/declare.h"
+#include "absl/strings/string_view.h"
+
+ABSL_DECLARE_FLAG(std::vector<std::string>, flagfile);
+ABSL_DECLARE_FLAG(std::vector<std::string>, fromenv);
+ABSL_DECLARE_FLAG(std::vector<std::string>, tryfromenv);
+ABSL_DECLARE_FLAG(std::vector<std::string>, undefok);
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace flags_internal {
+
+enum class ArgvListAction { kRemoveParsedArgs, kKeepParsedArgs };
+enum class UsageFlagsAction { kHandleUsage, kIgnoreUsage };
+enum class OnUndefinedFlag {
+ kIgnoreUndefined,
+ kReportUndefined,
+ kAbortIfUndefined
+};
+
+std::vector<char*> ParseCommandLineImpl(int argc, char* argv[],
+ ArgvListAction arg_list_act,
+ UsageFlagsAction usage_flag_act,
+ OnUndefinedFlag on_undef_flag);
+
+// --------------------------------------------------------------------
+// Inspect original command line
+
+// Returns true if flag with specified name was either present on the original
+// command line or specified in flag file present on the original command line.
+bool WasPresentOnCommandLine(absl::string_view flag_name);
+
+} // namespace flags_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_FLAGS_INTERNAL_PARSE_H_
diff --git a/third_party/abseil/src/absl/flags/internal/path_util.h b/third_party/abseil/src/absl/flags/internal/path_util.h
new file mode 100644
index 0000000..a6594d3
--- /dev/null
+++ b/third_party/abseil/src/absl/flags/internal/path_util.h
@@ -0,0 +1,62 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_FLAGS_INTERNAL_PATH_UTIL_H_
+#define ABSL_FLAGS_INTERNAL_PATH_UTIL_H_
+
+#include "absl/base/config.h"
+#include "absl/strings/string_view.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace flags_internal {
+
+// A portable interface that returns the basename of the filename passed as an
+// argument. It is similar to basename(3)
+// <https://linux.die.net/man/3/basename>.
+// For example:
+// flags_internal::Basename("a/b/prog/file.cc")
+// returns "file.cc"
+// flags_internal::Basename("file.cc")
+// returns "file.cc"
+inline absl::string_view Basename(absl::string_view filename) {
+ auto last_slash_pos = filename.find_last_of("/\\");
+
+ return last_slash_pos == absl::string_view::npos
+ ? filename
+ : filename.substr(last_slash_pos + 1);
+}
+
+// A portable interface that returns the directory name of the filename
+// passed as an argument, including the trailing slash.
+// Returns the empty string if a slash is not found in the input file name.
+// For example:
+// flags_internal::Package("a/b/prog/file.cc")
+// returns "a/b/prog/"
+// flags_internal::Package("file.cc")
+// returns ""
+inline absl::string_view Package(absl::string_view filename) {
+ auto last_slash_pos = filename.find_last_of("/\\");
+
+ return last_slash_pos == absl::string_view::npos
+ ? absl::string_view()
+ : filename.substr(0, last_slash_pos + 1);
+}
+
+} // namespace flags_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_FLAGS_INTERNAL_PATH_UTIL_H_
diff --git a/third_party/abseil/src/absl/flags/internal/path_util_test.cc b/third_party/abseil/src/absl/flags/internal/path_util_test.cc
new file mode 100644
index 0000000..2091373
--- /dev/null
+++ b/third_party/abseil/src/absl/flags/internal/path_util_test.cc
@@ -0,0 +1,46 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/flags/internal/path_util.h"
+
+#include "gtest/gtest.h"
+
+namespace {
+
+namespace flags = absl::flags_internal;
+
+TEST(FlagsPathUtilTest, TestBasename) {
+ EXPECT_EQ(flags::Basename(""), "");
+ EXPECT_EQ(flags::Basename("a.cc"), "a.cc");
+ EXPECT_EQ(flags::Basename("dir/a.cc"), "a.cc");
+ EXPECT_EQ(flags::Basename("dir1/dir2/a.cc"), "a.cc");
+ EXPECT_EQ(flags::Basename("../dir1/dir2/a.cc"), "a.cc");
+ EXPECT_EQ(flags::Basename("/dir1/dir2/a.cc"), "a.cc");
+ EXPECT_EQ(flags::Basename("/dir1/dir2/../dir3/a.cc"), "a.cc");
+}
+
+// --------------------------------------------------------------------
+
+TEST(FlagsPathUtilTest, TestPackage) {
+ EXPECT_EQ(flags::Package(""), "");
+ EXPECT_EQ(flags::Package("a.cc"), "");
+ EXPECT_EQ(flags::Package("dir/a.cc"), "dir/");
+ EXPECT_EQ(flags::Package("dir1/dir2/a.cc"), "dir1/dir2/");
+ EXPECT_EQ(flags::Package("../dir1/dir2/a.cc"), "../dir1/dir2/");
+ EXPECT_EQ(flags::Package("/dir1/dir2/a.cc"), "/dir1/dir2/");
+ EXPECT_EQ(flags::Package("/dir1/dir2/../dir3/a.cc"), "/dir1/dir2/../dir3/");
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/flags/internal/private_handle_accessor.cc b/third_party/abseil/src/absl/flags/internal/private_handle_accessor.cc
new file mode 100644
index 0000000..a7eb58b
--- /dev/null
+++ b/third_party/abseil/src/absl/flags/internal/private_handle_accessor.cc
@@ -0,0 +1,65 @@
+//
+// Copyright 2020 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/flags/internal/private_handle_accessor.h"
+
+#include <memory>
+#include <string>
+
+#include "absl/base/config.h"
+#include "absl/flags/commandlineflag.h"
+#include "absl/flags/internal/commandlineflag.h"
+#include "absl/strings/string_view.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace flags_internal {
+
+FlagFastTypeId PrivateHandleAccessor::TypeId(const CommandLineFlag& flag) {
+ return flag.TypeId();
+}
+
+std::unique_ptr<FlagStateInterface> PrivateHandleAccessor::SaveState(
+ CommandLineFlag& flag) {
+ return flag.SaveState();
+}
+
+bool PrivateHandleAccessor::IsSpecifiedOnCommandLine(
+ const CommandLineFlag& flag) {
+ return flag.IsSpecifiedOnCommandLine();
+}
+
+bool PrivateHandleAccessor::ValidateInputValue(const CommandLineFlag& flag,
+ absl::string_view value) {
+ return flag.ValidateInputValue(value);
+}
+
+void PrivateHandleAccessor::CheckDefaultValueParsingRoundtrip(
+ const CommandLineFlag& flag) {
+ flag.CheckDefaultValueParsingRoundtrip();
+}
+
+bool PrivateHandleAccessor::ParseFrom(CommandLineFlag& flag,
+ absl::string_view value,
+ flags_internal::FlagSettingMode set_mode,
+ flags_internal::ValueSource source,
+ std::string& error) {
+ return flag.ParseFrom(value, set_mode, source, error);
+}
+
+} // namespace flags_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
diff --git a/third_party/abseil/src/absl/flags/internal/private_handle_accessor.h b/third_party/abseil/src/absl/flags/internal/private_handle_accessor.h
new file mode 100644
index 0000000..c64435c
--- /dev/null
+++ b/third_party/abseil/src/absl/flags/internal/private_handle_accessor.h
@@ -0,0 +1,61 @@
+//
+// Copyright 2020 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_FLAGS_INTERNAL_PRIVATE_HANDLE_ACCESSOR_H_
+#define ABSL_FLAGS_INTERNAL_PRIVATE_HANDLE_ACCESSOR_H_
+
+#include <memory>
+#include <string>
+
+#include "absl/base/config.h"
+#include "absl/flags/commandlineflag.h"
+#include "absl/flags/internal/commandlineflag.h"
+#include "absl/strings/string_view.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace flags_internal {
+
+// This class serves as a trampoline to access private methods of
+// CommandLineFlag. This class is intended for use exclusively internally inside
+// of the Abseil Flags implementation.
+class PrivateHandleAccessor {
+ public:
+ // Access to CommandLineFlag::TypeId.
+ static FlagFastTypeId TypeId(const CommandLineFlag& flag);
+
+ // Access to CommandLineFlag::SaveState.
+ static std::unique_ptr<FlagStateInterface> SaveState(CommandLineFlag& flag);
+
+ // Access to CommandLineFlag::IsSpecifiedOnCommandLine.
+ static bool IsSpecifiedOnCommandLine(const CommandLineFlag& flag);
+
+ // Access to CommandLineFlag::ValidateInputValue.
+ static bool ValidateInputValue(const CommandLineFlag& flag,
+ absl::string_view value);
+
+ // Access to CommandLineFlag::CheckDefaultValueParsingRoundtrip.
+ static void CheckDefaultValueParsingRoundtrip(const CommandLineFlag& flag);
+
+ static bool ParseFrom(CommandLineFlag& flag, absl::string_view value,
+ flags_internal::FlagSettingMode set_mode,
+ flags_internal::ValueSource source, std::string& error);
+};
+
+} // namespace flags_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_FLAGS_INTERNAL_PRIVATE_HANDLE_ACCESSOR_H_
diff --git a/third_party/abseil/src/absl/flags/internal/program_name.cc b/third_party/abseil/src/absl/flags/internal/program_name.cc
new file mode 100644
index 0000000..51d698d
--- /dev/null
+++ b/third_party/abseil/src/absl/flags/internal/program_name.cc
@@ -0,0 +1,60 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/flags/internal/program_name.h"
+
+#include <string>
+
+#include "absl/base/attributes.h"
+#include "absl/base/config.h"
+#include "absl/base/const_init.h"
+#include "absl/base/thread_annotations.h"
+#include "absl/flags/internal/path_util.h"
+#include "absl/strings/string_view.h"
+#include "absl/synchronization/mutex.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace flags_internal {
+
+ABSL_CONST_INIT static absl::Mutex program_name_guard(absl::kConstInit);
+ABSL_CONST_INIT static std::string* program_name
+ ABSL_GUARDED_BY(program_name_guard) = nullptr;
+
+std::string ProgramInvocationName() {
+ absl::MutexLock l(&program_name_guard);
+
+ return program_name ? *program_name : "UNKNOWN";
+}
+
+std::string ShortProgramInvocationName() {
+ absl::MutexLock l(&program_name_guard);
+
+ return program_name ? std::string(flags_internal::Basename(*program_name))
+ : "UNKNOWN";
+}
+
+void SetProgramInvocationName(absl::string_view prog_name_str) {
+ absl::MutexLock l(&program_name_guard);
+
+ if (!program_name)
+ program_name = new std::string(prog_name_str);
+ else
+ program_name->assign(prog_name_str.data(), prog_name_str.size());
+}
+
+} // namespace flags_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/flags/internal/program_name.h b/third_party/abseil/src/absl/flags/internal/program_name.h
new file mode 100644
index 0000000..b99b94f
--- /dev/null
+++ b/third_party/abseil/src/absl/flags/internal/program_name.h
@@ -0,0 +1,50 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_FLAGS_INTERNAL_PROGRAM_NAME_H_
+#define ABSL_FLAGS_INTERNAL_PROGRAM_NAME_H_
+
+#include <string>
+
+#include "absl/base/config.h"
+#include "absl/strings/string_view.h"
+
+// --------------------------------------------------------------------
+// Program name
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace flags_internal {
+
+// Returns program invocation name or "UNKNOWN" if `SetProgramInvocationName()`
+// is never called. At the moment this is always set to argv[0] as part of
+// library initialization.
+std::string ProgramInvocationName();
+
+// Returns base name for program invocation name. For example, if
+// ProgramInvocationName() == "a/b/mybinary"
+// then
+// ShortProgramInvocationName() == "mybinary"
+std::string ShortProgramInvocationName();
+
+// Sets program invocation name to a new value. Should only be called once
+// during program initialization, before any threads are spawned.
+void SetProgramInvocationName(absl::string_view prog_name_str);
+
+} // namespace flags_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_FLAGS_INTERNAL_PROGRAM_NAME_H_
diff --git a/third_party/abseil/src/absl/flags/internal/program_name_test.cc b/third_party/abseil/src/absl/flags/internal/program_name_test.cc
new file mode 100644
index 0000000..aff9f63
--- /dev/null
+++ b/third_party/abseil/src/absl/flags/internal/program_name_test.cc
@@ -0,0 +1,61 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/flags/internal/program_name.h"
+
+#include <string>
+
+#include "gtest/gtest.h"
+#include "absl/strings/match.h"
+#include "absl/strings/string_view.h"
+
+namespace {
+
+namespace flags = absl::flags_internal;
+
+TEST(FlagsPathUtilTest, TestProgamNameInterfaces) {
+ flags::SetProgramInvocationName("absl/flags/program_name_test");
+ std::string program_name = flags::ProgramInvocationName();
+ for (char& c : program_name)
+ if (c == '\\') c = '/';
+
+#if !defined(__wasm__) && !defined(__asmjs__)
+ const std::string expect_name = "absl/flags/program_name_test";
+ const std::string expect_basename = "program_name_test";
+#else
+ // For targets that generate javascript or webassembly the invocation name
+ // has the special value below.
+ const std::string expect_name = "this.program";
+ const std::string expect_basename = "this.program";
+#endif
+
+ EXPECT_TRUE(absl::EndsWith(program_name, expect_name)) << program_name;
+ EXPECT_EQ(flags::ShortProgramInvocationName(), expect_basename);
+
+ flags::SetProgramInvocationName("a/my_test");
+
+ EXPECT_EQ(flags::ProgramInvocationName(), "a/my_test");
+ EXPECT_EQ(flags::ShortProgramInvocationName(), "my_test");
+
+ absl::string_view not_null_terminated("absl/aaa/bbb");
+ not_null_terminated = not_null_terminated.substr(1, 10);
+
+ flags::SetProgramInvocationName(not_null_terminated);
+
+ EXPECT_EQ(flags::ProgramInvocationName(), "bsl/aaa/bb");
+ EXPECT_EQ(flags::ShortProgramInvocationName(), "bb");
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/flags/internal/registry.h b/third_party/abseil/src/absl/flags/internal/registry.h
new file mode 100644
index 0000000..a8d9eb9
--- /dev/null
+++ b/third_party/abseil/src/absl/flags/internal/registry.h
@@ -0,0 +1,97 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_FLAGS_INTERNAL_REGISTRY_H_
+#define ABSL_FLAGS_INTERNAL_REGISTRY_H_
+
+#include <functional>
+
+#include "absl/base/config.h"
+#include "absl/flags/commandlineflag.h"
+#include "absl/flags/internal/commandlineflag.h"
+#include "absl/strings/string_view.h"
+
+// --------------------------------------------------------------------
+// Global flags registry API.
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace flags_internal {
+
+// Executes specified visitor for each non-retired flag in the registry. While
+// callback are executed, the registry is locked and can't be changed.
+void ForEachFlag(std::function<void(CommandLineFlag&)> visitor);
+
+//-----------------------------------------------------------------------------
+
+bool RegisterCommandLineFlag(CommandLineFlag&);
+
+void FinalizeRegistry();
+
+//-----------------------------------------------------------------------------
+// Retired registrations:
+//
+// Retired flag registrations are treated specially. A 'retired' flag is
+// provided only for compatibility with automated invocations that still
+// name it. A 'retired' flag:
+// - is not bound to a C++ FLAGS_ reference.
+// - has a type and a value, but that value is intentionally inaccessible.
+// - does not appear in --help messages.
+// - is fully supported by _all_ flag parsing routines.
+// - consumes args normally, and complains about type mismatches in its
+// argument.
+// - emits a complaint but does not die (e.g. LOG(ERROR)) if it is
+// accessed by name through the flags API for parsing or otherwise.
+//
+// The registrations for a flag happen in an unspecified order as the
+// initializers for the namespace-scope objects of a program are run.
+// Any number of weak registrations for a flag can weakly define the flag.
+// One non-weak registration will upgrade the flag from weak to non-weak.
+// Further weak registrations of a non-weak flag are ignored.
+//
+// This mechanism is designed to support moving dead flags into a
+// 'graveyard' library. An example migration:
+//
+// 0: Remove references to this FLAGS_flagname in the C++ codebase.
+// 1: Register as 'retired' in old_lib.
+// 2: Make old_lib depend on graveyard.
+// 3: Add a redundant 'retired' registration to graveyard.
+// 4: Remove the old_lib 'retired' registration.
+// 5: Eventually delete the graveyard registration entirely.
+//
+
+// Retire flag with name "name" and type indicated by ops.
+void Retire(const char* name, FlagFastTypeId type_id, char* buf);
+
+constexpr size_t kRetiredFlagObjSize = 3 * sizeof(void*);
+constexpr size_t kRetiredFlagObjAlignment = alignof(void*);
+
+// Registered a retired flag with name 'flag_name' and type 'T'.
+template <typename T>
+class RetiredFlag {
+ public:
+ void Retire(const char* flag_name) {
+ flags_internal::Retire(flag_name, base_internal::FastTypeId<T>(), buf_);
+ }
+
+ private:
+ alignas(kRetiredFlagObjAlignment) char buf_[kRetiredFlagObjSize];
+};
+
+} // namespace flags_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_FLAGS_INTERNAL_REGISTRY_H_
diff --git a/third_party/abseil/src/absl/flags/internal/usage.cc b/third_party/abseil/src/absl/flags/internal/usage.cc
new file mode 100644
index 0000000..f29d7c9
--- /dev/null
+++ b/third_party/abseil/src/absl/flags/internal/usage.cc
@@ -0,0 +1,524 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/flags/internal/usage.h"
+
+#include <stdint.h>
+
+#include <functional>
+#include <map>
+#include <ostream>
+#include <string>
+#include <utility>
+#include <vector>
+
+#include "absl/base/config.h"
+#include "absl/flags/commandlineflag.h"
+#include "absl/flags/flag.h"
+#include "absl/flags/internal/flag.h"
+#include "absl/flags/internal/path_util.h"
+#include "absl/flags/internal/private_handle_accessor.h"
+#include "absl/flags/internal/program_name.h"
+#include "absl/flags/internal/registry.h"
+#include "absl/flags/usage_config.h"
+#include "absl/strings/str_cat.h"
+#include "absl/strings/str_split.h"
+#include "absl/strings/string_view.h"
+
+// Dummy global variables to prevent anyone else defining these.
+bool FLAGS_help = false;
+bool FLAGS_helpfull = false;
+bool FLAGS_helpshort = false;
+bool FLAGS_helppackage = false;
+bool FLAGS_version = false;
+bool FLAGS_only_check_args = false;
+bool FLAGS_helpon = false;
+bool FLAGS_helpmatch = false;
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace flags_internal {
+namespace {
+
+using PerFlagFilter = std::function<bool(const absl::CommandLineFlag&)>;
+
+// Maximum length size in a human readable format.
+constexpr size_t kHrfMaxLineLength = 80;
+
+// This class is used to emit an XML element with `tag` and `text`.
+// It adds opening and closing tags and escapes special characters in the text.
+// For example:
+// std::cout << XMLElement("title", "Milk & Cookies");
+// prints "<title>Milk & Cookies</title>"
+class XMLElement {
+ public:
+ XMLElement(absl::string_view tag, absl::string_view txt)
+ : tag_(tag), txt_(txt) {}
+
+ friend std::ostream& operator<<(std::ostream& out,
+ const XMLElement& xml_elem) {
+ out << "<" << xml_elem.tag_ << ">";
+
+ for (auto c : xml_elem.txt_) {
+ switch (c) {
+ case '"':
+ out << """;
+ break;
+ case '\'':
+ out << "'";
+ break;
+ case '&':
+ out << "&";
+ break;
+ case '<':
+ out << "<";
+ break;
+ case '>':
+ out << ">";
+ break;
+ default:
+ out << c;
+ break;
+ }
+ }
+
+ return out << "</" << xml_elem.tag_ << ">";
+ }
+
+ private:
+ absl::string_view tag_;
+ absl::string_view txt_;
+};
+
+// --------------------------------------------------------------------
+// Helper class to pretty-print info about a flag.
+
+class FlagHelpPrettyPrinter {
+ public:
+ // Pretty printer holds on to the std::ostream& reference to direct an output
+ // to that stream.
+ FlagHelpPrettyPrinter(size_t max_line_len, size_t min_line_len,
+ size_t wrapped_line_indent, std::ostream& out)
+ : out_(out),
+ max_line_len_(max_line_len),
+ min_line_len_(min_line_len),
+ wrapped_line_indent_(wrapped_line_indent),
+ line_len_(0),
+ first_line_(true) {}
+
+ void Write(absl::string_view str, bool wrap_line = false) {
+ // Empty string - do nothing.
+ if (str.empty()) return;
+
+ std::vector<absl::string_view> tokens;
+ if (wrap_line) {
+ for (auto line : absl::StrSplit(str, absl::ByAnyChar("\n\r"))) {
+ if (!tokens.empty()) {
+ // Keep line separators in the input string.
+ tokens.push_back("\n");
+ }
+ for (auto token :
+ absl::StrSplit(line, absl::ByAnyChar(" \t"), absl::SkipEmpty())) {
+ tokens.push_back(token);
+ }
+ }
+ } else {
+ tokens.push_back(str);
+ }
+
+ for (auto token : tokens) {
+ bool new_line = (line_len_ == 0);
+
+ // Respect line separators in the input string.
+ if (token == "\n") {
+ EndLine();
+ continue;
+ }
+
+ // Write the token, ending the string first if necessary/possible.
+ if (!new_line &&
+ (line_len_ + static_cast<int>(token.size()) >= max_line_len_)) {
+ EndLine();
+ new_line = true;
+ }
+
+ if (new_line) {
+ StartLine();
+ } else {
+ out_ << ' ';
+ ++line_len_;
+ }
+
+ out_ << token;
+ line_len_ += token.size();
+ }
+ }
+
+ void StartLine() {
+ if (first_line_) {
+ line_len_ = min_line_len_;
+ first_line_ = false;
+ } else {
+ line_len_ = min_line_len_ + wrapped_line_indent_;
+ }
+ out_ << std::string(line_len_, ' ');
+ }
+ void EndLine() {
+ out_ << '\n';
+ line_len_ = 0;
+ }
+
+ private:
+ std::ostream& out_;
+ const size_t max_line_len_;
+ const size_t min_line_len_;
+ const size_t wrapped_line_indent_;
+ size_t line_len_;
+ bool first_line_;
+};
+
+void FlagHelpHumanReadable(const CommandLineFlag& flag, std::ostream& out) {
+ FlagHelpPrettyPrinter printer(kHrfMaxLineLength, 4, 2, out);
+
+ // Flag name.
+ printer.Write(absl::StrCat("--", flag.Name()));
+
+ // Flag help.
+ printer.Write(absl::StrCat("(", flag.Help(), ");"), /*wrap_line=*/true);
+
+ // The listed default value will be the actual default from the flag
+ // definition in the originating source file, unless the value has
+ // subsequently been modified using SetCommandLineOption() with mode
+ // SET_FLAGS_DEFAULT.
+ std::string dflt_val = flag.DefaultValue();
+ std::string curr_val = flag.CurrentValue();
+ bool is_modified = curr_val != dflt_val;
+
+ if (flag.IsOfType<std::string>()) {
+ dflt_val = absl::StrCat("\"", dflt_val, "\"");
+ }
+ printer.Write(absl::StrCat("default: ", dflt_val, ";"));
+
+ if (is_modified) {
+ if (flag.IsOfType<std::string>()) {
+ curr_val = absl::StrCat("\"", curr_val, "\"");
+ }
+ printer.Write(absl::StrCat("currently: ", curr_val, ";"));
+ }
+
+ printer.EndLine();
+}
+
+// Shows help for every filename which matches any of the filters
+// If filters are empty, shows help for every file.
+// If a flag's help message has been stripped (e.g. by adding '#define
+// STRIP_FLAG_HELP 1' then this flag will not be displayed by '--help'
+// and its variants.
+void FlagsHelpImpl(std::ostream& out, PerFlagFilter filter_cb,
+ HelpFormat format, absl::string_view program_usage_message) {
+ if (format == HelpFormat::kHumanReadable) {
+ out << flags_internal::ShortProgramInvocationName() << ": "
+ << program_usage_message << "\n\n";
+ } else {
+ // XML schema is not a part of our public API for now.
+ out << "<?xml version=\"1.0\"?>\n"
+ << "<!-- This output should be used with care. We do not report type "
+ "names for flags with user defined types -->\n"
+ << "<!-- Prefer flag only_check_args for validating flag inputs -->\n"
+ // The document.
+ << "<AllFlags>\n"
+ // The program name and usage.
+ << XMLElement("program", flags_internal::ShortProgramInvocationName())
+ << '\n'
+ << XMLElement("usage", program_usage_message) << '\n';
+ }
+
+ // Map of package name to
+ // map of file name to
+ // vector of flags in the file.
+ // This map is used to output matching flags grouped by package and file
+ // name.
+ std::map<std::string,
+ std::map<std::string, std::vector<const absl::CommandLineFlag*>>>
+ matching_flags;
+
+ flags_internal::ForEachFlag([&](absl::CommandLineFlag& flag) {
+ // Ignore retired flags.
+ if (flag.IsRetired()) return;
+
+ // If the flag has been stripped, pretend that it doesn't exist.
+ if (flag.Help() == flags_internal::kStrippedFlagHelp) return;
+
+ // Make sure flag satisfies the filter
+ if (!filter_cb(flag)) return;
+
+ std::string flag_filename = flag.Filename();
+
+ matching_flags[std::string(flags_internal::Package(flag_filename))]
+ [flag_filename]
+ .push_back(&flag);
+ });
+
+ absl::string_view package_separator; // controls blank lines between packages
+ absl::string_view file_separator; // controls blank lines between files
+ for (const auto& package : matching_flags) {
+ if (format == HelpFormat::kHumanReadable) {
+ out << package_separator;
+ package_separator = "\n\n";
+ }
+
+ file_separator = "";
+ for (const auto& flags_in_file : package.second) {
+ if (format == HelpFormat::kHumanReadable) {
+ out << file_separator << " Flags from " << flags_in_file.first
+ << ":\n";
+ file_separator = "\n";
+ }
+
+ for (const auto* flag : flags_in_file.second) {
+ flags_internal::FlagHelp(out, *flag, format);
+ }
+ }
+ }
+
+ if (format == HelpFormat::kHumanReadable) {
+ FlagHelpPrettyPrinter printer(kHrfMaxLineLength, 0, 0, out);
+
+ if (filter_cb && matching_flags.empty()) {
+ printer.Write("No flags matched.\n", true);
+ }
+ printer.EndLine();
+ printer.Write(
+ "Try --helpfull to get a list of all flags or --help=substring "
+ "shows help for flags which include specified substring in either "
+ "in the name, or description or path.\n",
+ true);
+ } else {
+ // The end of the document.
+ out << "</AllFlags>\n";
+ }
+}
+
+void FlagsHelpImpl(std::ostream& out,
+ flags_internal::FlagKindFilter filename_filter_cb,
+ HelpFormat format, absl::string_view program_usage_message) {
+ FlagsHelpImpl(
+ out,
+ [&](const absl::CommandLineFlag& flag) {
+ return filename_filter_cb && filename_filter_cb(flag.Filename());
+ },
+ format, program_usage_message);
+}
+
+} // namespace
+
+// --------------------------------------------------------------------
+// Produces the help message describing specific flag.
+void FlagHelp(std::ostream& out, const CommandLineFlag& flag,
+ HelpFormat format) {
+ if (format == HelpFormat::kHumanReadable)
+ flags_internal::FlagHelpHumanReadable(flag, out);
+}
+
+// --------------------------------------------------------------------
+// Produces the help messages for all flags matching the filename filter.
+// If filter is empty produces help messages for all flags.
+void FlagsHelp(std::ostream& out, absl::string_view filter, HelpFormat format,
+ absl::string_view program_usage_message) {
+ flags_internal::FlagKindFilter filter_cb = [&](absl::string_view filename) {
+ return filter.empty() || filename.find(filter) != absl::string_view::npos;
+ };
+ flags_internal::FlagsHelpImpl(out, filter_cb, format, program_usage_message);
+}
+
+// --------------------------------------------------------------------
+// Checks all the 'usage' command line flags to see if any have been set.
+// If so, handles them appropriately.
+int HandleUsageFlags(std::ostream& out,
+ absl::string_view program_usage_message) {
+ switch (GetFlagsHelpMode()) {
+ case HelpMode::kNone:
+ break;
+ case HelpMode::kImportant:
+ flags_internal::FlagsHelpImpl(
+ out, flags_internal::GetUsageConfig().contains_help_flags,
+ GetFlagsHelpFormat(), program_usage_message);
+ return 1;
+
+ case HelpMode::kShort:
+ flags_internal::FlagsHelpImpl(
+ out, flags_internal::GetUsageConfig().contains_helpshort_flags,
+ GetFlagsHelpFormat(), program_usage_message);
+ return 1;
+
+ case HelpMode::kFull:
+ flags_internal::FlagsHelp(out, "", GetFlagsHelpFormat(),
+ program_usage_message);
+ return 1;
+
+ case HelpMode::kPackage:
+ flags_internal::FlagsHelpImpl(
+ out, flags_internal::GetUsageConfig().contains_helppackage_flags,
+ GetFlagsHelpFormat(), program_usage_message);
+
+ return 1;
+
+ case HelpMode::kMatch: {
+ std::string substr = GetFlagsHelpMatchSubstr();
+ if (substr.empty()) {
+ // show all options
+ flags_internal::FlagsHelp(out, substr, GetFlagsHelpFormat(),
+ program_usage_message);
+ } else {
+ auto filter_cb = [&substr](const absl::CommandLineFlag& flag) {
+ if (absl::StrContains(flag.Name(), substr)) return true;
+ if (absl::StrContains(flag.Filename(), substr)) return true;
+ if (absl::StrContains(flag.Help(), substr)) return true;
+
+ return false;
+ };
+ flags_internal::FlagsHelpImpl(
+ out, filter_cb, HelpFormat::kHumanReadable, program_usage_message);
+ }
+
+ return 1;
+ }
+ case HelpMode::kVersion:
+ if (flags_internal::GetUsageConfig().version_string)
+ out << flags_internal::GetUsageConfig().version_string();
+ // Unlike help, we may be asking for version in a script, so return 0
+ return 0;
+
+ case HelpMode::kOnlyCheckArgs:
+ return 0;
+ }
+
+ return -1;
+}
+
+// --------------------------------------------------------------------
+// Globals representing usage reporting flags
+
+namespace {
+
+ABSL_CONST_INIT absl::Mutex help_attributes_guard(absl::kConstInit);
+ABSL_CONST_INIT std::string* match_substr
+ ABSL_GUARDED_BY(help_attributes_guard) = nullptr;
+ABSL_CONST_INIT HelpMode help_mode ABSL_GUARDED_BY(help_attributes_guard) =
+ HelpMode::kNone;
+ABSL_CONST_INIT HelpFormat help_format ABSL_GUARDED_BY(help_attributes_guard) =
+ HelpFormat::kHumanReadable;
+
+} // namespace
+
+std::string GetFlagsHelpMatchSubstr() {
+ absl::MutexLock l(&help_attributes_guard);
+ if (match_substr == nullptr) return "";
+ return *match_substr;
+}
+
+void SetFlagsHelpMatchSubstr(absl::string_view substr) {
+ absl::MutexLock l(&help_attributes_guard);
+ if (match_substr == nullptr) match_substr = new std::string;
+ match_substr->assign(substr.data(), substr.size());
+}
+
+HelpMode GetFlagsHelpMode() {
+ absl::MutexLock l(&help_attributes_guard);
+ // Refer to dummy variales to prevent linker dropping them
+ if (FLAGS_help || FLAGS_helpfull || FLAGS_helpshort || FLAGS_helppackage ||
+ FLAGS_version || FLAGS_only_check_args || FLAGS_helpon ||
+ FLAGS_helpmatch) {
+ help_mode = HelpMode::kNone;
+ }
+ return help_mode;
+}
+
+void SetFlagsHelpMode(HelpMode mode) {
+ absl::MutexLock l(&help_attributes_guard);
+ help_mode = mode;
+}
+
+HelpFormat GetFlagsHelpFormat() {
+ absl::MutexLock l(&help_attributes_guard);
+ return help_format;
+}
+
+void SetFlagsHelpFormat(HelpFormat format) {
+ absl::MutexLock l(&help_attributes_guard);
+ help_format = format;
+}
+
+// Deduces usage flags from the input argument in a form --name=value or
+// --name. argument is already split into name and value before we call this
+// function.
+bool DeduceUsageFlags(absl::string_view name, absl::string_view value) {
+ if (absl::ConsumePrefix(&name, "help")) {
+ if (name == "") {
+ if (value.empty()) {
+ SetFlagsHelpMode(HelpMode::kImportant);
+ } else {
+ SetFlagsHelpMode(HelpMode::kMatch);
+ SetFlagsHelpMatchSubstr(value);
+ }
+ return true;
+ }
+
+ if (name == "match") {
+ SetFlagsHelpMode(HelpMode::kMatch);
+ SetFlagsHelpMatchSubstr(value);
+ return true;
+ }
+
+ if (name == "on") {
+ SetFlagsHelpMode(HelpMode::kMatch);
+ SetFlagsHelpMatchSubstr(absl::StrCat("/", value, "."));
+ return true;
+ }
+
+ if (name == "full") {
+ SetFlagsHelpMode(HelpMode::kFull);
+ return true;
+ }
+
+ if (name == "short") {
+ SetFlagsHelpMode(HelpMode::kShort);
+ return true;
+ }
+
+ if (name == "package") {
+ SetFlagsHelpMode(HelpMode::kPackage);
+ return true;
+ }
+
+ return false;
+ }
+
+ if (name == "version") {
+ SetFlagsHelpMode(HelpMode::kVersion);
+ return true;
+ }
+
+ if (name == "only_check_args") {
+ SetFlagsHelpMode(HelpMode::kOnlyCheckArgs);
+ return true;
+ }
+
+ return false;
+}
+
+} // namespace flags_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/flags/internal/usage.h b/third_party/abseil/src/absl/flags/internal/usage.h
new file mode 100644
index 0000000..c0bcac5
--- /dev/null
+++ b/third_party/abseil/src/absl/flags/internal/usage.h
@@ -0,0 +1,104 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_FLAGS_INTERNAL_USAGE_H_
+#define ABSL_FLAGS_INTERNAL_USAGE_H_
+
+#include <iosfwd>
+#include <string>
+
+#include "absl/base/config.h"
+#include "absl/flags/commandlineflag.h"
+#include "absl/flags/declare.h"
+#include "absl/strings/string_view.h"
+
+// --------------------------------------------------------------------
+// Usage reporting interfaces
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace flags_internal {
+
+// The format to report the help messages in.
+enum class HelpFormat {
+ kHumanReadable,
+};
+
+// Streams the help message describing `flag` to `out`.
+// The default value for `flag` is included in the output.
+void FlagHelp(std::ostream& out, const CommandLineFlag& flag,
+ HelpFormat format = HelpFormat::kHumanReadable);
+
+// Produces the help messages for all flags matching the filter. A flag matches
+// the filter if it is defined in a file with a filename which includes
+// filter string as a substring. You can use '/' and '.' to restrict the
+// matching to a specific file names. For example:
+// FlagsHelp(out, "/path/to/file.");
+// restricts help to only flags which resides in files named like:
+// .../path/to/file.<ext>
+// for any extension 'ext'. If the filter is empty this function produces help
+// messages for all flags.
+void FlagsHelp(std::ostream& out, absl::string_view filter,
+ HelpFormat format, absl::string_view program_usage_message);
+
+// --------------------------------------------------------------------
+
+// If any of the 'usage' related command line flags (listed on the bottom of
+// this file) has been set this routine produces corresponding help message in
+// the specified output stream and returns:
+// 0 - if "version" or "only_check_flags" flags were set and handled.
+// 1 - if some other 'usage' related flag was set and handled.
+// -1 - if no usage flags were set on a commmand line.
+// Non negative return values are expected to be used as an exit code for a
+// binary.
+int HandleUsageFlags(std::ostream& out,
+ absl::string_view program_usage_message);
+
+// --------------------------------------------------------------------
+// Globals representing usage reporting flags
+
+enum class HelpMode {
+ kNone,
+ kImportant,
+ kShort,
+ kFull,
+ kPackage,
+ kMatch,
+ kVersion,
+ kOnlyCheckArgs
+};
+
+// Returns substring to filter help output (--help=substr argument)
+std::string GetFlagsHelpMatchSubstr();
+// Returns the requested help mode.
+HelpMode GetFlagsHelpMode();
+// Returns the requested help format.
+HelpFormat GetFlagsHelpFormat();
+
+// These are corresponding setters to the attributes above.
+void SetFlagsHelpMatchSubstr(absl::string_view);
+void SetFlagsHelpMode(HelpMode);
+void SetFlagsHelpFormat(HelpFormat);
+
+// Deduces usage flags from the input argument in a form --name=value or
+// --name. argument is already split into name and value before we call this
+// function.
+bool DeduceUsageFlags(absl::string_view name, absl::string_view value);
+
+} // namespace flags_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_FLAGS_INTERNAL_USAGE_H_
diff --git a/third_party/abseil/src/absl/flags/internal/usage_test.cc b/third_party/abseil/src/absl/flags/internal/usage_test.cc
new file mode 100644
index 0000000..b5c2487
--- /dev/null
+++ b/third_party/abseil/src/absl/flags/internal/usage_test.cc
@@ -0,0 +1,493 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/flags/internal/usage.h"
+
+#include <stdint.h>
+
+#include <sstream>
+#include <string>
+
+#include "gtest/gtest.h"
+#include "absl/flags/flag.h"
+#include "absl/flags/internal/parse.h"
+#include "absl/flags/internal/path_util.h"
+#include "absl/flags/internal/program_name.h"
+#include "absl/flags/reflection.h"
+#include "absl/flags/usage.h"
+#include "absl/flags/usage_config.h"
+#include "absl/strings/match.h"
+#include "absl/strings/string_view.h"
+
+ABSL_FLAG(int, usage_reporting_test_flag_01, 101,
+ "usage_reporting_test_flag_01 help message");
+ABSL_FLAG(bool, usage_reporting_test_flag_02, false,
+ "usage_reporting_test_flag_02 help message");
+ABSL_FLAG(double, usage_reporting_test_flag_03, 1.03,
+ "usage_reporting_test_flag_03 help message");
+ABSL_FLAG(int64_t, usage_reporting_test_flag_04, 1000000000000004L,
+ "usage_reporting_test_flag_04 help message");
+
+static const char kTestUsageMessage[] = "Custom usage message";
+
+struct UDT {
+ UDT() = default;
+ UDT(const UDT&) = default;
+};
+bool AbslParseFlag(absl::string_view, UDT*, std::string*) { return true; }
+std::string AbslUnparseFlag(const UDT&) { return "UDT{}"; }
+
+ABSL_FLAG(UDT, usage_reporting_test_flag_05, {},
+ "usage_reporting_test_flag_05 help message");
+
+ABSL_FLAG(
+ std::string, usage_reporting_test_flag_06, {},
+ "usage_reporting_test_flag_06 help message.\n"
+ "\n"
+ "Some more help.\n"
+ "Even more long long long long long long long long long long long long "
+ "help message.");
+
+namespace {
+
+namespace flags = absl::flags_internal;
+
+static std::string NormalizeFileName(absl::string_view fname) {
+#ifdef _WIN32
+ std::string normalized(fname);
+ std::replace(normalized.begin(), normalized.end(), '\\', '/');
+ fname = normalized;
+#endif
+
+ auto absl_pos = fname.rfind("absl/");
+ if (absl_pos != absl::string_view::npos) {
+ fname = fname.substr(absl_pos);
+ }
+ return std::string(fname);
+}
+
+class UsageReportingTest : public testing::Test {
+ protected:
+ UsageReportingTest() {
+ // Install default config for the use on this unit test.
+ // Binary may install a custom config before tests are run.
+ absl::FlagsUsageConfig default_config;
+ default_config.normalize_filename = &NormalizeFileName;
+ absl::SetFlagsUsageConfig(default_config);
+ }
+ ~UsageReportingTest() override {
+ flags::SetFlagsHelpMode(flags::HelpMode::kNone);
+ flags::SetFlagsHelpMatchSubstr("");
+ flags::SetFlagsHelpFormat(flags::HelpFormat::kHumanReadable);
+ }
+
+ private:
+ absl::FlagSaver flag_saver_;
+};
+
+// --------------------------------------------------------------------
+
+using UsageReportingDeathTest = UsageReportingTest;
+
+TEST_F(UsageReportingDeathTest, TestSetProgramUsageMessage) {
+ EXPECT_EQ(absl::ProgramUsageMessage(), kTestUsageMessage);
+
+#ifndef _WIN32
+ // TODO(rogeeff): figure out why this does not work on Windows.
+ EXPECT_DEATH_IF_SUPPORTED(
+ absl::SetProgramUsageMessage("custom usage message"),
+ ".*SetProgramUsageMessage\\(\\) called twice.*");
+#endif
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(UsageReportingTest, TestFlagHelpHRF_on_flag_01) {
+ const auto* flag = absl::FindCommandLineFlag("usage_reporting_test_flag_01");
+ std::stringstream test_buf;
+
+ flags::FlagHelp(test_buf, *flag, flags::HelpFormat::kHumanReadable);
+ EXPECT_EQ(
+ test_buf.str(),
+ R"( --usage_reporting_test_flag_01 (usage_reporting_test_flag_01 help message);
+ default: 101;
+)");
+}
+
+TEST_F(UsageReportingTest, TestFlagHelpHRF_on_flag_02) {
+ const auto* flag = absl::FindCommandLineFlag("usage_reporting_test_flag_02");
+ std::stringstream test_buf;
+
+ flags::FlagHelp(test_buf, *flag, flags::HelpFormat::kHumanReadable);
+ EXPECT_EQ(
+ test_buf.str(),
+ R"( --usage_reporting_test_flag_02 (usage_reporting_test_flag_02 help message);
+ default: false;
+)");
+}
+
+TEST_F(UsageReportingTest, TestFlagHelpHRF_on_flag_03) {
+ const auto* flag = absl::FindCommandLineFlag("usage_reporting_test_flag_03");
+ std::stringstream test_buf;
+
+ flags::FlagHelp(test_buf, *flag, flags::HelpFormat::kHumanReadable);
+ EXPECT_EQ(
+ test_buf.str(),
+ R"( --usage_reporting_test_flag_03 (usage_reporting_test_flag_03 help message);
+ default: 1.03;
+)");
+}
+
+TEST_F(UsageReportingTest, TestFlagHelpHRF_on_flag_04) {
+ const auto* flag = absl::FindCommandLineFlag("usage_reporting_test_flag_04");
+ std::stringstream test_buf;
+
+ flags::FlagHelp(test_buf, *flag, flags::HelpFormat::kHumanReadable);
+ EXPECT_EQ(
+ test_buf.str(),
+ R"( --usage_reporting_test_flag_04 (usage_reporting_test_flag_04 help message);
+ default: 1000000000000004;
+)");
+}
+
+TEST_F(UsageReportingTest, TestFlagHelpHRF_on_flag_05) {
+ const auto* flag = absl::FindCommandLineFlag("usage_reporting_test_flag_05");
+ std::stringstream test_buf;
+
+ flags::FlagHelp(test_buf, *flag, flags::HelpFormat::kHumanReadable);
+ EXPECT_EQ(
+ test_buf.str(),
+ R"( --usage_reporting_test_flag_05 (usage_reporting_test_flag_05 help message);
+ default: UDT{};
+)");
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(UsageReportingTest, TestFlagsHelpHRF) {
+ std::string usage_test_flags_out =
+ R"(usage_test: Custom usage message
+
+ Flags from absl/flags/internal/usage_test.cc:
+ --usage_reporting_test_flag_01 (usage_reporting_test_flag_01 help message);
+ default: 101;
+ --usage_reporting_test_flag_02 (usage_reporting_test_flag_02 help message);
+ default: false;
+ --usage_reporting_test_flag_03 (usage_reporting_test_flag_03 help message);
+ default: 1.03;
+ --usage_reporting_test_flag_04 (usage_reporting_test_flag_04 help message);
+ default: 1000000000000004;
+ --usage_reporting_test_flag_05 (usage_reporting_test_flag_05 help message);
+ default: UDT{};
+ --usage_reporting_test_flag_06 (usage_reporting_test_flag_06 help message.
+
+ Some more help.
+ Even more long long long long long long long long long long long long help
+ message.); default: "";
+
+Try --helpfull to get a list of all flags or --help=substring shows help for
+flags which include specified substring in either in the name, or description or
+path.
+)";
+
+ std::stringstream test_buf_01;
+ flags::FlagsHelp(test_buf_01, "usage_test.cc",
+ flags::HelpFormat::kHumanReadable, kTestUsageMessage);
+ EXPECT_EQ(test_buf_01.str(), usage_test_flags_out);
+
+ std::stringstream test_buf_02;
+ flags::FlagsHelp(test_buf_02, "flags/internal/usage_test.cc",
+ flags::HelpFormat::kHumanReadable, kTestUsageMessage);
+ EXPECT_EQ(test_buf_02.str(), usage_test_flags_out);
+
+ std::stringstream test_buf_03;
+ flags::FlagsHelp(test_buf_03, "usage_test", flags::HelpFormat::kHumanReadable,
+ kTestUsageMessage);
+ EXPECT_EQ(test_buf_03.str(), usage_test_flags_out);
+
+ std::stringstream test_buf_04;
+ flags::FlagsHelp(test_buf_04, "flags/invalid_file_name.cc",
+ flags::HelpFormat::kHumanReadable, kTestUsageMessage);
+ EXPECT_EQ(test_buf_04.str(),
+ R"(usage_test: Custom usage message
+
+No flags matched.
+
+Try --helpfull to get a list of all flags or --help=substring shows help for
+flags which include specified substring in either in the name, or description or
+path.
+)");
+
+ std::stringstream test_buf_05;
+ flags::FlagsHelp(test_buf_05, "", flags::HelpFormat::kHumanReadable,
+ kTestUsageMessage);
+ std::string test_out = test_buf_05.str();
+ absl::string_view test_out_str(test_out);
+ EXPECT_TRUE(
+ absl::StartsWith(test_out_str, "usage_test: Custom usage message"));
+ EXPECT_TRUE(absl::StrContains(
+ test_out_str, "Flags from absl/flags/internal/usage_test.cc:"));
+ EXPECT_TRUE(
+ absl::StrContains(test_out_str, "-usage_reporting_test_flag_01 "));
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(UsageReportingTest, TestNoUsageFlags) {
+ std::stringstream test_buf;
+ EXPECT_EQ(flags::HandleUsageFlags(test_buf, kTestUsageMessage), -1);
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(UsageReportingTest, TestUsageFlag_helpshort) {
+ flags::SetFlagsHelpMode(flags::HelpMode::kShort);
+
+ std::stringstream test_buf;
+ EXPECT_EQ(flags::HandleUsageFlags(test_buf, kTestUsageMessage), 1);
+ EXPECT_EQ(test_buf.str(),
+ R"(usage_test: Custom usage message
+
+ Flags from absl/flags/internal/usage_test.cc:
+ --usage_reporting_test_flag_01 (usage_reporting_test_flag_01 help message);
+ default: 101;
+ --usage_reporting_test_flag_02 (usage_reporting_test_flag_02 help message);
+ default: false;
+ --usage_reporting_test_flag_03 (usage_reporting_test_flag_03 help message);
+ default: 1.03;
+ --usage_reporting_test_flag_04 (usage_reporting_test_flag_04 help message);
+ default: 1000000000000004;
+ --usage_reporting_test_flag_05 (usage_reporting_test_flag_05 help message);
+ default: UDT{};
+ --usage_reporting_test_flag_06 (usage_reporting_test_flag_06 help message.
+
+ Some more help.
+ Even more long long long long long long long long long long long long help
+ message.); default: "";
+
+Try --helpfull to get a list of all flags or --help=substring shows help for
+flags which include specified substring in either in the name, or description or
+path.
+)");
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(UsageReportingTest, TestUsageFlag_help_simple) {
+ flags::SetFlagsHelpMode(flags::HelpMode::kImportant);
+
+ std::stringstream test_buf;
+ EXPECT_EQ(flags::HandleUsageFlags(test_buf, kTestUsageMessage), 1);
+ EXPECT_EQ(test_buf.str(),
+ R"(usage_test: Custom usage message
+
+ Flags from absl/flags/internal/usage_test.cc:
+ --usage_reporting_test_flag_01 (usage_reporting_test_flag_01 help message);
+ default: 101;
+ --usage_reporting_test_flag_02 (usage_reporting_test_flag_02 help message);
+ default: false;
+ --usage_reporting_test_flag_03 (usage_reporting_test_flag_03 help message);
+ default: 1.03;
+ --usage_reporting_test_flag_04 (usage_reporting_test_flag_04 help message);
+ default: 1000000000000004;
+ --usage_reporting_test_flag_05 (usage_reporting_test_flag_05 help message);
+ default: UDT{};
+ --usage_reporting_test_flag_06 (usage_reporting_test_flag_06 help message.
+
+ Some more help.
+ Even more long long long long long long long long long long long long help
+ message.); default: "";
+
+Try --helpfull to get a list of all flags or --help=substring shows help for
+flags which include specified substring in either in the name, or description or
+path.
+)");
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(UsageReportingTest, TestUsageFlag_help_one_flag) {
+ flags::SetFlagsHelpMode(flags::HelpMode::kMatch);
+ flags::SetFlagsHelpMatchSubstr("usage_reporting_test_flag_06");
+
+ std::stringstream test_buf;
+ EXPECT_EQ(flags::HandleUsageFlags(test_buf, kTestUsageMessage), 1);
+ EXPECT_EQ(test_buf.str(),
+ R"(usage_test: Custom usage message
+
+ Flags from absl/flags/internal/usage_test.cc:
+ --usage_reporting_test_flag_06 (usage_reporting_test_flag_06 help message.
+
+ Some more help.
+ Even more long long long long long long long long long long long long help
+ message.); default: "";
+
+Try --helpfull to get a list of all flags or --help=substring shows help for
+flags which include specified substring in either in the name, or description or
+path.
+)");
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(UsageReportingTest, TestUsageFlag_help_multiple_flag) {
+ flags::SetFlagsHelpMode(flags::HelpMode::kMatch);
+ flags::SetFlagsHelpMatchSubstr("test_flag");
+
+ std::stringstream test_buf;
+ EXPECT_EQ(flags::HandleUsageFlags(test_buf, kTestUsageMessage), 1);
+ EXPECT_EQ(test_buf.str(),
+ R"(usage_test: Custom usage message
+
+ Flags from absl/flags/internal/usage_test.cc:
+ --usage_reporting_test_flag_01 (usage_reporting_test_flag_01 help message);
+ default: 101;
+ --usage_reporting_test_flag_02 (usage_reporting_test_flag_02 help message);
+ default: false;
+ --usage_reporting_test_flag_03 (usage_reporting_test_flag_03 help message);
+ default: 1.03;
+ --usage_reporting_test_flag_04 (usage_reporting_test_flag_04 help message);
+ default: 1000000000000004;
+ --usage_reporting_test_flag_05 (usage_reporting_test_flag_05 help message);
+ default: UDT{};
+ --usage_reporting_test_flag_06 (usage_reporting_test_flag_06 help message.
+
+ Some more help.
+ Even more long long long long long long long long long long long long help
+ message.); default: "";
+
+Try --helpfull to get a list of all flags or --help=substring shows help for
+flags which include specified substring in either in the name, or description or
+path.
+)");
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(UsageReportingTest, TestUsageFlag_helppackage) {
+ flags::SetFlagsHelpMode(flags::HelpMode::kPackage);
+
+ std::stringstream test_buf;
+ EXPECT_EQ(flags::HandleUsageFlags(test_buf, kTestUsageMessage), 1);
+ EXPECT_EQ(test_buf.str(),
+ R"(usage_test: Custom usage message
+
+ Flags from absl/flags/internal/usage_test.cc:
+ --usage_reporting_test_flag_01 (usage_reporting_test_flag_01 help message);
+ default: 101;
+ --usage_reporting_test_flag_02 (usage_reporting_test_flag_02 help message);
+ default: false;
+ --usage_reporting_test_flag_03 (usage_reporting_test_flag_03 help message);
+ default: 1.03;
+ --usage_reporting_test_flag_04 (usage_reporting_test_flag_04 help message);
+ default: 1000000000000004;
+ --usage_reporting_test_flag_05 (usage_reporting_test_flag_05 help message);
+ default: UDT{};
+ --usage_reporting_test_flag_06 (usage_reporting_test_flag_06 help message.
+
+ Some more help.
+ Even more long long long long long long long long long long long long help
+ message.); default: "";
+
+Try --helpfull to get a list of all flags or --help=substring shows help for
+flags which include specified substring in either in the name, or description or
+path.
+)");
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(UsageReportingTest, TestUsageFlag_version) {
+ flags::SetFlagsHelpMode(flags::HelpMode::kVersion);
+
+ std::stringstream test_buf;
+ EXPECT_EQ(flags::HandleUsageFlags(test_buf, kTestUsageMessage), 0);
+#ifndef NDEBUG
+ EXPECT_EQ(test_buf.str(), "usage_test\nDebug build (NDEBUG not #defined)\n");
+#else
+ EXPECT_EQ(test_buf.str(), "usage_test\n");
+#endif
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(UsageReportingTest, TestUsageFlag_only_check_args) {
+ flags::SetFlagsHelpMode(flags::HelpMode::kOnlyCheckArgs);
+
+ std::stringstream test_buf;
+ EXPECT_EQ(flags::HandleUsageFlags(test_buf, kTestUsageMessage), 0);
+ EXPECT_EQ(test_buf.str(), "");
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(UsageReportingTest, TestUsageFlag_helpon) {
+ flags::SetFlagsHelpMode(flags::HelpMode::kMatch);
+ flags::SetFlagsHelpMatchSubstr("/bla-bla.");
+
+ std::stringstream test_buf_01;
+ EXPECT_EQ(flags::HandleUsageFlags(test_buf_01, kTestUsageMessage), 1);
+ EXPECT_EQ(test_buf_01.str(),
+ R"(usage_test: Custom usage message
+
+No flags matched.
+
+Try --helpfull to get a list of all flags or --help=substring shows help for
+flags which include specified substring in either in the name, or description or
+path.
+)");
+
+ flags::SetFlagsHelpMatchSubstr("/usage_test.");
+
+ std::stringstream test_buf_02;
+ EXPECT_EQ(flags::HandleUsageFlags(test_buf_02, kTestUsageMessage), 1);
+ EXPECT_EQ(test_buf_02.str(),
+ R"(usage_test: Custom usage message
+
+ Flags from absl/flags/internal/usage_test.cc:
+ --usage_reporting_test_flag_01 (usage_reporting_test_flag_01 help message);
+ default: 101;
+ --usage_reporting_test_flag_02 (usage_reporting_test_flag_02 help message);
+ default: false;
+ --usage_reporting_test_flag_03 (usage_reporting_test_flag_03 help message);
+ default: 1.03;
+ --usage_reporting_test_flag_04 (usage_reporting_test_flag_04 help message);
+ default: 1000000000000004;
+ --usage_reporting_test_flag_05 (usage_reporting_test_flag_05 help message);
+ default: UDT{};
+ --usage_reporting_test_flag_06 (usage_reporting_test_flag_06 help message.
+
+ Some more help.
+ Even more long long long long long long long long long long long long help
+ message.); default: "";
+
+Try --helpfull to get a list of all flags or --help=substring shows help for
+flags which include specified substring in either in the name, or description or
+path.
+)");
+}
+
+// --------------------------------------------------------------------
+
+} // namespace
+
+int main(int argc, char* argv[]) {
+ (void)absl::GetFlag(FLAGS_undefok); // Force linking of parse.cc
+ flags::SetProgramInvocationName("usage_test");
+ absl::SetProgramUsageMessage(kTestUsageMessage);
+ ::testing::InitGoogleTest(&argc, argv);
+
+ return RUN_ALL_TESTS();
+}
diff --git a/third_party/abseil/src/absl/flags/marshalling.cc b/third_party/abseil/src/absl/flags/marshalling.cc
new file mode 100644
index 0000000..81f9ceb
--- /dev/null
+++ b/third_party/abseil/src/absl/flags/marshalling.cc
@@ -0,0 +1,241 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/flags/marshalling.h"
+
+#include <stddef.h>
+
+#include <cmath>
+#include <limits>
+#include <string>
+#include <type_traits>
+#include <vector>
+
+#include "absl/base/config.h"
+#include "absl/base/log_severity.h"
+#include "absl/base/macros.h"
+#include "absl/strings/ascii.h"
+#include "absl/strings/match.h"
+#include "absl/strings/numbers.h"
+#include "absl/strings/str_cat.h"
+#include "absl/strings/str_format.h"
+#include "absl/strings/str_join.h"
+#include "absl/strings/str_split.h"
+#include "absl/strings/string_view.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace flags_internal {
+
+// --------------------------------------------------------------------
+// AbslParseFlag specializations for boolean type.
+
+bool AbslParseFlag(absl::string_view text, bool* dst, std::string*) {
+ const char* kTrue[] = {"1", "t", "true", "y", "yes"};
+ const char* kFalse[] = {"0", "f", "false", "n", "no"};
+ static_assert(sizeof(kTrue) == sizeof(kFalse), "true_false_equal");
+
+ text = absl::StripAsciiWhitespace(text);
+
+ for (size_t i = 0; i < ABSL_ARRAYSIZE(kTrue); ++i) {
+ if (absl::EqualsIgnoreCase(text, kTrue[i])) {
+ *dst = true;
+ return true;
+ } else if (absl::EqualsIgnoreCase(text, kFalse[i])) {
+ *dst = false;
+ return true;
+ }
+ }
+ return false; // didn't match a legal input
+}
+
+// --------------------------------------------------------------------
+// AbslParseFlag for integral types.
+
+// Return the base to use for parsing text as an integer. Leading 0x
+// puts us in base 16. But leading 0 does not put us in base 8. It
+// caused too many bugs when we had that behavior.
+static int NumericBase(absl::string_view text) {
+ const bool hex = (text.size() >= 2 && text[0] == '0' &&
+ (text[1] == 'x' || text[1] == 'X'));
+ return hex ? 16 : 10;
+}
+
+template <typename IntType>
+inline bool ParseFlagImpl(absl::string_view text, IntType& dst) {
+ text = absl::StripAsciiWhitespace(text);
+
+ return absl::numbers_internal::safe_strtoi_base(text, &dst,
+ NumericBase(text));
+}
+
+bool AbslParseFlag(absl::string_view text, short* dst, std::string*) {
+ int val;
+ if (!ParseFlagImpl(text, val)) return false;
+ if (static_cast<short>(val) != val) // worked, but number out of range
+ return false;
+ *dst = static_cast<short>(val);
+ return true;
+}
+
+bool AbslParseFlag(absl::string_view text, unsigned short* dst, std::string*) {
+ unsigned int val;
+ if (!ParseFlagImpl(text, val)) return false;
+ if (static_cast<unsigned short>(val) !=
+ val) // worked, but number out of range
+ return false;
+ *dst = static_cast<unsigned short>(val);
+ return true;
+}
+
+bool AbslParseFlag(absl::string_view text, int* dst, std::string*) {
+ return ParseFlagImpl(text, *dst);
+}
+
+bool AbslParseFlag(absl::string_view text, unsigned int* dst, std::string*) {
+ return ParseFlagImpl(text, *dst);
+}
+
+bool AbslParseFlag(absl::string_view text, long* dst, std::string*) {
+ return ParseFlagImpl(text, *dst);
+}
+
+bool AbslParseFlag(absl::string_view text, unsigned long* dst, std::string*) {
+ return ParseFlagImpl(text, *dst);
+}
+
+bool AbslParseFlag(absl::string_view text, long long* dst, std::string*) {
+ return ParseFlagImpl(text, *dst);
+}
+
+bool AbslParseFlag(absl::string_view text, unsigned long long* dst,
+ std::string*) {
+ return ParseFlagImpl(text, *dst);
+}
+
+// --------------------------------------------------------------------
+// AbslParseFlag for floating point types.
+
+bool AbslParseFlag(absl::string_view text, float* dst, std::string*) {
+ return absl::SimpleAtof(text, dst);
+}
+
+bool AbslParseFlag(absl::string_view text, double* dst, std::string*) {
+ return absl::SimpleAtod(text, dst);
+}
+
+// --------------------------------------------------------------------
+// AbslParseFlag for strings.
+
+bool AbslParseFlag(absl::string_view text, std::string* dst, std::string*) {
+ dst->assign(text.data(), text.size());
+ return true;
+}
+
+// --------------------------------------------------------------------
+// AbslParseFlag for vector of strings.
+
+bool AbslParseFlag(absl::string_view text, std::vector<std::string>* dst,
+ std::string*) {
+ // An empty flag value corresponds to an empty vector, not a vector
+ // with a single, empty std::string.
+ if (text.empty()) {
+ dst->clear();
+ return true;
+ }
+ *dst = absl::StrSplit(text, ',', absl::AllowEmpty());
+ return true;
+}
+
+// --------------------------------------------------------------------
+// AbslUnparseFlag specializations for various builtin flag types.
+
+std::string Unparse(bool v) { return v ? "true" : "false"; }
+std::string Unparse(short v) { return absl::StrCat(v); }
+std::string Unparse(unsigned short v) { return absl::StrCat(v); }
+std::string Unparse(int v) { return absl::StrCat(v); }
+std::string Unparse(unsigned int v) { return absl::StrCat(v); }
+std::string Unparse(long v) { return absl::StrCat(v); }
+std::string Unparse(unsigned long v) { return absl::StrCat(v); }
+std::string Unparse(long long v) { return absl::StrCat(v); }
+std::string Unparse(unsigned long long v) { return absl::StrCat(v); }
+template <typename T>
+std::string UnparseFloatingPointVal(T v) {
+ // digits10 is guaranteed to roundtrip correctly in string -> value -> string
+ // conversions, but may not be enough to represent all the values correctly.
+ std::string digit10_str =
+ absl::StrFormat("%.*g", std::numeric_limits<T>::digits10, v);
+ if (std::isnan(v) || std::isinf(v)) return digit10_str;
+
+ T roundtrip_val = 0;
+ std::string err;
+ if (absl::ParseFlag(digit10_str, &roundtrip_val, &err) &&
+ roundtrip_val == v) {
+ return digit10_str;
+ }
+
+ // max_digits10 is the number of base-10 digits that are necessary to uniquely
+ // represent all distinct values.
+ return absl::StrFormat("%.*g", std::numeric_limits<T>::max_digits10, v);
+}
+std::string Unparse(float v) { return UnparseFloatingPointVal(v); }
+std::string Unparse(double v) { return UnparseFloatingPointVal(v); }
+std::string AbslUnparseFlag(absl::string_view v) { return std::string(v); }
+std::string AbslUnparseFlag(const std::vector<std::string>& v) {
+ return absl::StrJoin(v, ",");
+}
+
+} // namespace flags_internal
+
+bool AbslParseFlag(absl::string_view text, absl::LogSeverity* dst,
+ std::string* err) {
+ text = absl::StripAsciiWhitespace(text);
+ if (text.empty()) {
+ *err = "no value provided";
+ return false;
+ }
+ if (text.front() == 'k' || text.front() == 'K') text.remove_prefix(1);
+ if (absl::EqualsIgnoreCase(text, "info")) {
+ *dst = absl::LogSeverity::kInfo;
+ return true;
+ }
+ if (absl::EqualsIgnoreCase(text, "warning")) {
+ *dst = absl::LogSeverity::kWarning;
+ return true;
+ }
+ if (absl::EqualsIgnoreCase(text, "error")) {
+ *dst = absl::LogSeverity::kError;
+ return true;
+ }
+ if (absl::EqualsIgnoreCase(text, "fatal")) {
+ *dst = absl::LogSeverity::kFatal;
+ return true;
+ }
+ std::underlying_type<absl::LogSeverity>::type numeric_value;
+ if (absl::ParseFlag(text, &numeric_value, err)) {
+ *dst = static_cast<absl::LogSeverity>(numeric_value);
+ return true;
+ }
+ *err = "only integers and absl::LogSeverity enumerators are accepted";
+ return false;
+}
+
+std::string AbslUnparseFlag(absl::LogSeverity v) {
+ if (v == absl::NormalizeLogSeverity(v)) return absl::LogSeverityName(v);
+ return absl::UnparseFlag(static_cast<int>(v));
+}
+
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/flags/marshalling.h b/third_party/abseil/src/absl/flags/marshalling.h
new file mode 100644
index 0000000..0b50335
--- /dev/null
+++ b/third_party/abseil/src/absl/flags/marshalling.h
@@ -0,0 +1,264 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: marshalling.h
+// -----------------------------------------------------------------------------
+//
+// This header file defines the API for extending Abseil flag support to
+// custom types, and defines the set of overloads for fundamental types.
+//
+// Out of the box, the Abseil flags library supports the following types:
+//
+// * `bool`
+// * `int16_t`
+// * `uint16_t`
+// * `int32_t`
+// * `uint32_t`
+// * `int64_t`
+// * `uint64_t`
+// * `float`
+// * `double`
+// * `std::string`
+// * `std::vector<std::string>`
+// * `absl::LogSeverity` (provided natively for layering reasons)
+//
+// Note that support for integral types is implemented using overloads for
+// variable-width fundamental types (`short`, `int`, `long`, etc.). However,
+// you should prefer the fixed-width integral types (`int32_t`, `uint64_t`,
+// etc.) we've noted above within flag definitions.
+//
+// In addition, several Abseil libraries provide their own custom support for
+// Abseil flags. Documentation for these formats is provided in the type's
+// `AbslParseFlag()` definition.
+//
+// The Abseil time library provides the following support for civil time values:
+//
+// * `absl::CivilSecond`
+// * `absl::CivilMinute`
+// * `absl::CivilHour`
+// * `absl::CivilDay`
+// * `absl::CivilMonth`
+// * `absl::CivilYear`
+//
+// and also provides support for the following absolute time values:
+//
+// * `absl::Duration`
+// * `absl::Time`
+//
+// Additional support for Abseil types will be noted here as it is added.
+//
+// You can also provide your own custom flags by adding overloads for
+// `AbslParseFlag()` and `AbslUnparseFlag()` to your type definitions. (See
+// below.)
+//
+// -----------------------------------------------------------------------------
+// Adding Type Support for Abseil Flags
+// -----------------------------------------------------------------------------
+//
+// To add support for your user-defined type, add overloads of `AbslParseFlag()`
+// and `AbslUnparseFlag()` as free (non-member) functions to your type. If `T`
+// is a class type, these functions can be friend function definitions. These
+// overloads must be added to the same namespace where the type is defined, so
+// that they can be discovered by Argument-Dependent Lookup (ADL).
+//
+// Example:
+//
+// namespace foo {
+//
+// enum OutputMode { kPlainText, kHtml };
+//
+// // AbslParseFlag converts from a string to OutputMode.
+// // Must be in same namespace as OutputMode.
+//
+// // Parses an OutputMode from the command line flag value `text. Returns
+// // `true` and sets `*mode` on success; returns `false` and sets `*error`
+// // on failure.
+// bool AbslParseFlag(absl::string_view text,
+// OutputMode* mode,
+// std::string* error) {
+// if (text == "plaintext") {
+// *mode = kPlainText;
+// return true;
+// }
+// if (text == "html") {
+// *mode = kHtml;
+// return true;
+// }
+// *error = "unknown value for enumeration";
+// return false;
+// }
+//
+// // AbslUnparseFlag converts from an OutputMode to a string.
+// // Must be in same namespace as OutputMode.
+//
+// // Returns a textual flag value corresponding to the OutputMode `mode`.
+// std::string AbslUnparseFlag(OutputMode mode) {
+// switch (mode) {
+// case kPlainText: return "plaintext";
+// case kHtml: return "html";
+// }
+// return absl::StrCat(mode);
+// }
+//
+// Notice that neither `AbslParseFlag()` nor `AbslUnparseFlag()` are class
+// members, but free functions. `AbslParseFlag/AbslUnparseFlag()` overloads
+// for a type should only be declared in the same file and namespace as said
+// type. The proper `AbslParseFlag/AbslUnparseFlag()` implementations for a
+// given type will be discovered via Argument-Dependent Lookup (ADL).
+//
+// `AbslParseFlag()` may need, in turn, to parse simpler constituent types
+// using `absl::ParseFlag()`. For example, a custom struct `MyFlagType`
+// consisting of a `std::pair<int, std::string>` would add an `AbslParseFlag()`
+// overload for its `MyFlagType` like so:
+//
+// Example:
+//
+// namespace my_flag_type {
+//
+// struct MyFlagType {
+// std::pair<int, std::string> my_flag_data;
+// };
+//
+// bool AbslParseFlag(absl::string_view text, MyFlagType* flag,
+// std::string* err);
+//
+// std::string AbslUnparseFlag(const MyFlagType&);
+//
+// // Within the implementation, `AbslParseFlag()` will, in turn invoke
+// // `absl::ParseFlag()` on its constituent `int` and `std::string` types
+// // (which have built-in Abseil flag support.
+//
+// bool AbslParseFlag(absl::string_view text, MyFlagType* flag,
+// std::string* err) {
+// std::pair<absl::string_view, absl::string_view> tokens =
+// absl::StrSplit(text, ',');
+// if (!absl::ParseFlag(tokens.first, &flag->my_flag_data.first, err))
+// return false;
+// if (!absl::ParseFlag(tokens.second, &flag->my_flag_data.second, err))
+// return false;
+// return true;
+// }
+//
+// // Similarly, for unparsing, we can simply invoke `absl::UnparseFlag()` on
+// // the constituent types.
+// std::string AbslUnparseFlag(const MyFlagType& flag) {
+// return absl::StrCat(absl::UnparseFlag(flag.my_flag_data.first),
+// ",",
+// absl::UnparseFlag(flag.my_flag_data.second));
+// }
+#ifndef ABSL_FLAGS_MARSHALLING_H_
+#define ABSL_FLAGS_MARSHALLING_H_
+
+#include <string>
+#include <vector>
+
+#include "absl/base/config.h"
+#include "absl/strings/string_view.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace flags_internal {
+
+// Overloads of `AbslParseFlag()` and `AbslUnparseFlag()` for fundamental types.
+bool AbslParseFlag(absl::string_view, bool*, std::string*);
+bool AbslParseFlag(absl::string_view, short*, std::string*); // NOLINT
+bool AbslParseFlag(absl::string_view, unsigned short*, std::string*); // NOLINT
+bool AbslParseFlag(absl::string_view, int*, std::string*); // NOLINT
+bool AbslParseFlag(absl::string_view, unsigned int*, std::string*); // NOLINT
+bool AbslParseFlag(absl::string_view, long*, std::string*); // NOLINT
+bool AbslParseFlag(absl::string_view, unsigned long*, std::string*); // NOLINT
+bool AbslParseFlag(absl::string_view, long long*, std::string*); // NOLINT
+bool AbslParseFlag(absl::string_view, unsigned long long*, // NOLINT
+ std::string*);
+bool AbslParseFlag(absl::string_view, float*, std::string*);
+bool AbslParseFlag(absl::string_view, double*, std::string*);
+bool AbslParseFlag(absl::string_view, std::string*, std::string*);
+bool AbslParseFlag(absl::string_view, std::vector<std::string>*, std::string*);
+
+template <typename T>
+bool InvokeParseFlag(absl::string_view input, T* dst, std::string* err) {
+ // Comment on next line provides a good compiler error message if T
+ // does not have AbslParseFlag(absl::string_view, T*, std::string*).
+ return AbslParseFlag(input, dst, err); // Is T missing AbslParseFlag?
+}
+
+// Strings and std:: containers do not have the same overload resolution
+// considerations as fundamental types. Naming these 'AbslUnparseFlag' means we
+// can avoid the need for additional specializations of Unparse (below).
+std::string AbslUnparseFlag(absl::string_view v);
+std::string AbslUnparseFlag(const std::vector<std::string>&);
+
+template <typename T>
+std::string Unparse(const T& v) {
+ // Comment on next line provides a good compiler error message if T does not
+ // have UnparseFlag.
+ return AbslUnparseFlag(v); // Is T missing AbslUnparseFlag?
+}
+
+// Overloads for builtin types.
+std::string Unparse(bool v);
+std::string Unparse(short v); // NOLINT
+std::string Unparse(unsigned short v); // NOLINT
+std::string Unparse(int v); // NOLINT
+std::string Unparse(unsigned int v); // NOLINT
+std::string Unparse(long v); // NOLINT
+std::string Unparse(unsigned long v); // NOLINT
+std::string Unparse(long long v); // NOLINT
+std::string Unparse(unsigned long long v); // NOLINT
+std::string Unparse(float v);
+std::string Unparse(double v);
+
+} // namespace flags_internal
+
+// ParseFlag()
+//
+// Parses a string value into a flag value of type `T`. Do not add overloads of
+// this function for your type directly; instead, add an `AbslParseFlag()`
+// free function as documented above.
+//
+// Some implementations of `AbslParseFlag()` for types which consist of other,
+// constituent types which already have Abseil flag support, may need to call
+// `absl::ParseFlag()` on those consituent string values. (See above.)
+template <typename T>
+inline bool ParseFlag(absl::string_view input, T* dst, std::string* error) {
+ return flags_internal::InvokeParseFlag(input, dst, error);
+}
+
+// UnparseFlag()
+//
+// Unparses a flag value of type `T` into a string value. Do not add overloads
+// of this function for your type directly; instead, add an `AbslUnparseFlag()`
+// free function as documented above.
+//
+// Some implementations of `AbslUnparseFlag()` for types which consist of other,
+// constituent types which already have Abseil flag support, may want to call
+// `absl::UnparseFlag()` on those constituent types. (See above.)
+template <typename T>
+inline std::string UnparseFlag(const T& v) {
+ return flags_internal::Unparse(v);
+}
+
+// Overloads for `absl::LogSeverity` can't (easily) appear alongside that type's
+// definition because it is layered below flags. See proper documentation in
+// base/log_severity.h.
+enum class LogSeverity : int;
+bool AbslParseFlag(absl::string_view, absl::LogSeverity*, std::string*);
+std::string AbslUnparseFlag(absl::LogSeverity);
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_FLAGS_MARSHALLING_H_
diff --git a/third_party/abseil/src/absl/flags/marshalling_test.cc b/third_party/abseil/src/absl/flags/marshalling_test.cc
new file mode 100644
index 0000000..4a64ce1
--- /dev/null
+++ b/third_party/abseil/src/absl/flags/marshalling_test.cc
@@ -0,0 +1,904 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/flags/marshalling.h"
+
+#include <stdint.h>
+
+#include <cmath>
+#include <limits>
+#include <string>
+#include <vector>
+
+#include "gtest/gtest.h"
+
+namespace {
+
+TEST(MarshallingTest, TestBoolParsing) {
+ std::string err;
+ bool value;
+
+ // True values.
+ EXPECT_TRUE(absl::ParseFlag("True", &value, &err));
+ EXPECT_TRUE(value);
+ EXPECT_TRUE(absl::ParseFlag("true", &value, &err));
+ EXPECT_TRUE(value);
+ EXPECT_TRUE(absl::ParseFlag("TRUE", &value, &err));
+ EXPECT_TRUE(value);
+
+ EXPECT_TRUE(absl::ParseFlag("Yes", &value, &err));
+ EXPECT_TRUE(value);
+ EXPECT_TRUE(absl::ParseFlag("yes", &value, &err));
+ EXPECT_TRUE(value);
+ EXPECT_TRUE(absl::ParseFlag("YES", &value, &err));
+ EXPECT_TRUE(value);
+
+ EXPECT_TRUE(absl::ParseFlag("t", &value, &err));
+ EXPECT_TRUE(value);
+ EXPECT_TRUE(absl::ParseFlag("T", &value, &err));
+ EXPECT_TRUE(value);
+
+ EXPECT_TRUE(absl::ParseFlag("y", &value, &err));
+ EXPECT_TRUE(value);
+ EXPECT_TRUE(absl::ParseFlag("Y", &value, &err));
+ EXPECT_TRUE(value);
+
+ EXPECT_TRUE(absl::ParseFlag("1", &value, &err));
+ EXPECT_TRUE(value);
+
+ // False values.
+ EXPECT_TRUE(absl::ParseFlag("False", &value, &err));
+ EXPECT_FALSE(value);
+ EXPECT_TRUE(absl::ParseFlag("false", &value, &err));
+ EXPECT_FALSE(value);
+ EXPECT_TRUE(absl::ParseFlag("FALSE", &value, &err));
+ EXPECT_FALSE(value);
+
+ EXPECT_TRUE(absl::ParseFlag("No", &value, &err));
+ EXPECT_FALSE(value);
+ EXPECT_TRUE(absl::ParseFlag("no", &value, &err));
+ EXPECT_FALSE(value);
+ EXPECT_TRUE(absl::ParseFlag("NO", &value, &err));
+ EXPECT_FALSE(value);
+
+ EXPECT_TRUE(absl::ParseFlag("f", &value, &err));
+ EXPECT_FALSE(value);
+ EXPECT_TRUE(absl::ParseFlag("F", &value, &err));
+ EXPECT_FALSE(value);
+
+ EXPECT_TRUE(absl::ParseFlag("n", &value, &err));
+ EXPECT_FALSE(value);
+ EXPECT_TRUE(absl::ParseFlag("N", &value, &err));
+ EXPECT_FALSE(value);
+
+ EXPECT_TRUE(absl::ParseFlag("0", &value, &err));
+ EXPECT_FALSE(value);
+
+ // Whitespace handling.
+ EXPECT_TRUE(absl::ParseFlag(" true", &value, &err));
+ EXPECT_TRUE(value);
+ EXPECT_TRUE(absl::ParseFlag("true ", &value, &err));
+ EXPECT_TRUE(value);
+ EXPECT_TRUE(absl::ParseFlag(" true ", &value, &err));
+ EXPECT_TRUE(value);
+
+ // Invalid input.
+ EXPECT_FALSE(absl::ParseFlag("", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag(" ", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("\n", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("\t", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("2", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("11", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("tt", &value, &err));
+}
+
+// --------------------------------------------------------------------
+
+TEST(MarshallingTest, TestInt16Parsing) {
+ std::string err;
+ int16_t value;
+
+ // Decimal values.
+ EXPECT_TRUE(absl::ParseFlag("1", &value, &err));
+ EXPECT_EQ(value, 1);
+ EXPECT_TRUE(absl::ParseFlag("0", &value, &err));
+ EXPECT_EQ(value, 0);
+ EXPECT_TRUE(absl::ParseFlag("-1", &value, &err));
+ EXPECT_EQ(value, -1);
+ EXPECT_TRUE(absl::ParseFlag("123", &value, &err));
+ EXPECT_EQ(value, 123);
+ EXPECT_TRUE(absl::ParseFlag("-18765", &value, &err));
+ EXPECT_EQ(value, -18765);
+ EXPECT_TRUE(absl::ParseFlag("+3", &value, &err));
+ EXPECT_EQ(value, 3);
+
+ // Leading zero values.
+ EXPECT_TRUE(absl::ParseFlag("01", &value, &err));
+ EXPECT_EQ(value, 1);
+ EXPECT_TRUE(absl::ParseFlag("-001", &value, &err));
+ EXPECT_EQ(value, -1);
+ EXPECT_TRUE(absl::ParseFlag("0000100", &value, &err));
+ EXPECT_EQ(value, 100);
+
+ // Hex values.
+ EXPECT_TRUE(absl::ParseFlag("0x10", &value, &err));
+ EXPECT_EQ(value, 16);
+ EXPECT_TRUE(absl::ParseFlag("0X234", &value, &err));
+ EXPECT_EQ(value, 564);
+ // TODO(rogeeff): fix below validations
+ EXPECT_FALSE(absl::ParseFlag("-0x7FFD", &value, &err));
+ EXPECT_NE(value, -3);
+ EXPECT_FALSE(absl::ParseFlag("+0x31", &value, &err));
+ EXPECT_NE(value, 49);
+
+ // Whitespace handling
+ EXPECT_TRUE(absl::ParseFlag("10 ", &value, &err));
+ EXPECT_EQ(value, 10);
+ EXPECT_TRUE(absl::ParseFlag(" 11", &value, &err));
+ EXPECT_EQ(value, 11);
+ EXPECT_TRUE(absl::ParseFlag(" 012 ", &value, &err));
+ EXPECT_EQ(value, 12);
+ EXPECT_TRUE(absl::ParseFlag(" 0x22 ", &value, &err));
+ EXPECT_EQ(value, 34);
+
+ // Invalid values.
+ EXPECT_FALSE(absl::ParseFlag("", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag(" ", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag(" ", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("40000", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("--1", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("\n", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("\t", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("2U", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("FFF", &value, &err));
+}
+
+// --------------------------------------------------------------------
+
+TEST(MarshallingTest, TestUint16Parsing) {
+ std::string err;
+ uint16_t value;
+
+ // Decimal values.
+ EXPECT_TRUE(absl::ParseFlag("1", &value, &err));
+ EXPECT_EQ(value, 1);
+ EXPECT_TRUE(absl::ParseFlag("0", &value, &err));
+ EXPECT_EQ(value, 0);
+ EXPECT_TRUE(absl::ParseFlag("123", &value, &err));
+ EXPECT_EQ(value, 123);
+ EXPECT_TRUE(absl::ParseFlag("+3", &value, &err));
+ EXPECT_EQ(value, 3);
+
+ // Leading zero values.
+ EXPECT_TRUE(absl::ParseFlag("01", &value, &err));
+ EXPECT_EQ(value, 1);
+ EXPECT_TRUE(absl::ParseFlag("001", &value, &err));
+ EXPECT_EQ(value, 1);
+ EXPECT_TRUE(absl::ParseFlag("0000100", &value, &err));
+ EXPECT_EQ(value, 100);
+
+ // Hex values.
+ EXPECT_TRUE(absl::ParseFlag("0x10", &value, &err));
+ EXPECT_EQ(value, 16);
+ EXPECT_TRUE(absl::ParseFlag("0X234", &value, &err));
+ EXPECT_EQ(value, 564);
+ // TODO(rogeeff): fix below validations
+ EXPECT_FALSE(absl::ParseFlag("+0x31", &value, &err));
+ EXPECT_NE(value, 49);
+
+ // Whitespace handling
+ EXPECT_TRUE(absl::ParseFlag("10 ", &value, &err));
+ EXPECT_EQ(value, 10);
+ EXPECT_TRUE(absl::ParseFlag(" 11", &value, &err));
+ EXPECT_EQ(value, 11);
+ EXPECT_TRUE(absl::ParseFlag(" 012 ", &value, &err));
+ EXPECT_EQ(value, 12);
+ EXPECT_TRUE(absl::ParseFlag(" 0x22 ", &value, &err));
+ EXPECT_EQ(value, 34);
+
+ // Invalid values.
+ EXPECT_FALSE(absl::ParseFlag("", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag(" ", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag(" ", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("70000", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("-1", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("--1", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("\n", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("\t", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("2U", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("FFF", &value, &err));
+}
+
+// --------------------------------------------------------------------
+
+TEST(MarshallingTest, TestInt32Parsing) {
+ std::string err;
+ int32_t value;
+
+ // Decimal values.
+ EXPECT_TRUE(absl::ParseFlag("1", &value, &err));
+ EXPECT_EQ(value, 1);
+ EXPECT_TRUE(absl::ParseFlag("0", &value, &err));
+ EXPECT_EQ(value, 0);
+ EXPECT_TRUE(absl::ParseFlag("-1", &value, &err));
+ EXPECT_EQ(value, -1);
+ EXPECT_TRUE(absl::ParseFlag("123", &value, &err));
+ EXPECT_EQ(value, 123);
+ EXPECT_TRUE(absl::ParseFlag("-98765", &value, &err));
+ EXPECT_EQ(value, -98765);
+ EXPECT_TRUE(absl::ParseFlag("+3", &value, &err));
+ EXPECT_EQ(value, 3);
+
+ // Leading zero values.
+ EXPECT_TRUE(absl::ParseFlag("01", &value, &err));
+ EXPECT_EQ(value, 1);
+ EXPECT_TRUE(absl::ParseFlag("-001", &value, &err));
+ EXPECT_EQ(value, -1);
+ EXPECT_TRUE(absl::ParseFlag("0000100", &value, &err));
+ EXPECT_EQ(value, 100);
+
+ // Hex values.
+ EXPECT_TRUE(absl::ParseFlag("0x10", &value, &err));
+ EXPECT_EQ(value, 16);
+ EXPECT_TRUE(absl::ParseFlag("0X234", &value, &err));
+ EXPECT_EQ(value, 564);
+ // TODO(rogeeff): fix below validations
+ EXPECT_FALSE(absl::ParseFlag("-0x7FFFFFFD", &value, &err));
+ EXPECT_NE(value, -3);
+ EXPECT_FALSE(absl::ParseFlag("+0x31", &value, &err));
+ EXPECT_NE(value, 49);
+
+ // Whitespace handling
+ EXPECT_TRUE(absl::ParseFlag("10 ", &value, &err));
+ EXPECT_EQ(value, 10);
+ EXPECT_TRUE(absl::ParseFlag(" 11", &value, &err));
+ EXPECT_EQ(value, 11);
+ EXPECT_TRUE(absl::ParseFlag(" 012 ", &value, &err));
+ EXPECT_EQ(value, 12);
+ EXPECT_TRUE(absl::ParseFlag(" 0x22 ", &value, &err));
+ EXPECT_EQ(value, 34);
+
+ // Invalid values.
+ EXPECT_FALSE(absl::ParseFlag("", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag(" ", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag(" ", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("70000000000", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("--1", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("\n", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("\t", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("2U", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("FFF", &value, &err));
+}
+
+// --------------------------------------------------------------------
+
+TEST(MarshallingTest, TestUint32Parsing) {
+ std::string err;
+ uint32_t value;
+
+ // Decimal values.
+ EXPECT_TRUE(absl::ParseFlag("1", &value, &err));
+ EXPECT_EQ(value, 1);
+ EXPECT_TRUE(absl::ParseFlag("0", &value, &err));
+ EXPECT_EQ(value, 0);
+ EXPECT_TRUE(absl::ParseFlag("123", &value, &err));
+ EXPECT_EQ(value, 123);
+ EXPECT_TRUE(absl::ParseFlag("+3", &value, &err));
+ EXPECT_EQ(value, 3);
+
+ // Leading zero values.
+ EXPECT_TRUE(absl::ParseFlag("01", &value, &err));
+ EXPECT_EQ(value, 1);
+ EXPECT_TRUE(absl::ParseFlag("0000100", &value, &err));
+ EXPECT_EQ(value, 100);
+
+ // Hex values.
+ EXPECT_TRUE(absl::ParseFlag("0x10", &value, &err));
+ EXPECT_EQ(value, 16);
+ EXPECT_TRUE(absl::ParseFlag("0X234", &value, &err));
+ EXPECT_EQ(value, 564);
+ EXPECT_TRUE(absl::ParseFlag("0xFFFFFFFD", &value, &err));
+ EXPECT_EQ(value, 4294967293);
+ // TODO(rogeeff): fix below validations
+ EXPECT_FALSE(absl::ParseFlag("+0x31", &value, &err));
+ EXPECT_NE(value, 49);
+
+ // Whitespace handling
+ EXPECT_TRUE(absl::ParseFlag("10 ", &value, &err));
+ EXPECT_EQ(value, 10);
+ EXPECT_TRUE(absl::ParseFlag(" 11", &value, &err));
+ EXPECT_EQ(value, 11);
+ EXPECT_TRUE(absl::ParseFlag(" 012 ", &value, &err));
+ EXPECT_EQ(value, 12);
+ EXPECT_TRUE(absl::ParseFlag(" 0x22 ", &value, &err));
+ EXPECT_EQ(value, 34);
+
+ // Invalid values.
+ EXPECT_FALSE(absl::ParseFlag("", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag(" ", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag(" ", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("140000000000", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("-1", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("--1", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("\n", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("\t", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("2U", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("FFF", &value, &err));
+}
+
+// --------------------------------------------------------------------
+
+TEST(MarshallingTest, TestInt64Parsing) {
+ std::string err;
+ int64_t value;
+
+ // Decimal values.
+ EXPECT_TRUE(absl::ParseFlag("1", &value, &err));
+ EXPECT_EQ(value, 1);
+ EXPECT_TRUE(absl::ParseFlag("0", &value, &err));
+ EXPECT_EQ(value, 0);
+ EXPECT_TRUE(absl::ParseFlag("-1", &value, &err));
+ EXPECT_EQ(value, -1);
+ EXPECT_TRUE(absl::ParseFlag("123", &value, &err));
+ EXPECT_EQ(value, 123);
+ EXPECT_TRUE(absl::ParseFlag("-98765", &value, &err));
+ EXPECT_EQ(value, -98765);
+ EXPECT_TRUE(absl::ParseFlag("+3", &value, &err));
+ EXPECT_EQ(value, 3);
+
+ // Leading zero values.
+ EXPECT_TRUE(absl::ParseFlag("01", &value, &err));
+ EXPECT_EQ(value, 1);
+ EXPECT_TRUE(absl::ParseFlag("001", &value, &err));
+ EXPECT_EQ(value, 1);
+ EXPECT_TRUE(absl::ParseFlag("0000100", &value, &err));
+ EXPECT_EQ(value, 100);
+
+ // Hex values.
+ EXPECT_TRUE(absl::ParseFlag("0x10", &value, &err));
+ EXPECT_EQ(value, 16);
+ EXPECT_TRUE(absl::ParseFlag("0XFFFAAABBBCCCDDD", &value, &err));
+ EXPECT_EQ(value, 1152827684197027293);
+ // TODO(rogeeff): fix below validation
+ EXPECT_FALSE(absl::ParseFlag("-0x7FFFFFFFFFFFFFFE", &value, &err));
+ EXPECT_NE(value, -2);
+ EXPECT_FALSE(absl::ParseFlag("+0x31", &value, &err));
+ EXPECT_NE(value, 49);
+
+ // Whitespace handling
+ EXPECT_TRUE(absl::ParseFlag("10 ", &value, &err));
+ EXPECT_EQ(value, 10);
+ EXPECT_TRUE(absl::ParseFlag(" 11", &value, &err));
+ EXPECT_EQ(value, 11);
+ EXPECT_TRUE(absl::ParseFlag(" 012 ", &value, &err));
+ EXPECT_EQ(value, 12);
+ EXPECT_TRUE(absl::ParseFlag(" 0x7F ", &value, &err));
+ EXPECT_EQ(value, 127);
+
+ // Invalid values.
+ EXPECT_FALSE(absl::ParseFlag("", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag(" ", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag(" ", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("0xFFFFFFFFFFFFFFFFFF", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("--1", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("\n", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("\t", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("2U", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("FFF", &value, &err));
+}
+
+// --------------------------------------------------------------------
+
+TEST(MarshallingTest, TestUInt64Parsing) {
+ std::string err;
+ uint64_t value;
+
+ // Decimal values.
+ EXPECT_TRUE(absl::ParseFlag("1", &value, &err));
+ EXPECT_EQ(value, 1);
+ EXPECT_TRUE(absl::ParseFlag("0", &value, &err));
+ EXPECT_EQ(value, 0);
+ EXPECT_TRUE(absl::ParseFlag("123", &value, &err));
+ EXPECT_EQ(value, 123);
+ EXPECT_TRUE(absl::ParseFlag("+13", &value, &err));
+ EXPECT_EQ(value, 13);
+
+ // Leading zero values.
+ EXPECT_TRUE(absl::ParseFlag("01", &value, &err));
+ EXPECT_EQ(value, 1);
+ EXPECT_TRUE(absl::ParseFlag("001", &value, &err));
+ EXPECT_EQ(value, 1);
+ EXPECT_TRUE(absl::ParseFlag("0000300", &value, &err));
+ EXPECT_EQ(value, 300);
+
+ // Hex values.
+ EXPECT_TRUE(absl::ParseFlag("0x10", &value, &err));
+ EXPECT_EQ(value, 16);
+ EXPECT_TRUE(absl::ParseFlag("0XFFFF", &value, &err));
+ EXPECT_EQ(value, 65535);
+ // TODO(rogeeff): fix below validation
+ EXPECT_FALSE(absl::ParseFlag("+0x31", &value, &err));
+ EXPECT_NE(value, 49);
+
+ // Whitespace handling
+ EXPECT_TRUE(absl::ParseFlag("10 ", &value, &err));
+ EXPECT_EQ(value, 10);
+ EXPECT_TRUE(absl::ParseFlag(" 11", &value, &err));
+ EXPECT_EQ(value, 11);
+ EXPECT_TRUE(absl::ParseFlag(" 012 ", &value, &err));
+ EXPECT_EQ(value, 12);
+
+ // Invalid values.
+ EXPECT_FALSE(absl::ParseFlag("", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag(" ", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag(" ", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("0xFFFFFFFFFFFFFFFFFF", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("-1", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("--1", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("\n", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("\t", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("2U", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("FFF", &value, &err));
+}
+
+// --------------------------------------------------------------------
+
+TEST(MarshallingTest, TestFloatParsing) {
+ std::string err;
+ float value;
+
+ // Ordinary values.
+ EXPECT_TRUE(absl::ParseFlag("1.3", &value, &err));
+ EXPECT_FLOAT_EQ(value, 1.3f);
+ EXPECT_TRUE(absl::ParseFlag("-0.1", &value, &err));
+ EXPECT_DOUBLE_EQ(value, -0.1f);
+ EXPECT_TRUE(absl::ParseFlag("+0.01", &value, &err));
+ EXPECT_DOUBLE_EQ(value, 0.01f);
+
+ // Scientific values.
+ EXPECT_TRUE(absl::ParseFlag("1.2e3", &value, &err));
+ EXPECT_DOUBLE_EQ(value, 1.2e3f);
+ EXPECT_TRUE(absl::ParseFlag("9.8765402e-37", &value, &err));
+ EXPECT_DOUBLE_EQ(value, 9.8765402e-37f);
+ EXPECT_TRUE(absl::ParseFlag("0.11e+3", &value, &err));
+ EXPECT_DOUBLE_EQ(value, 0.11e+3f);
+ EXPECT_TRUE(absl::ParseFlag("1.e-2300", &value, &err));
+ EXPECT_DOUBLE_EQ(value, 0.f);
+ EXPECT_TRUE(absl::ParseFlag("1.e+2300", &value, &err));
+ EXPECT_TRUE(std::isinf(value));
+
+ // Leading zero values.
+ EXPECT_TRUE(absl::ParseFlag("01.6", &value, &err));
+ EXPECT_DOUBLE_EQ(value, 1.6f);
+ EXPECT_TRUE(absl::ParseFlag("000.0001", &value, &err));
+ EXPECT_DOUBLE_EQ(value, 0.0001f);
+
+ // Trailing zero values.
+ EXPECT_TRUE(absl::ParseFlag("-5.1000", &value, &err));
+ EXPECT_DOUBLE_EQ(value, -5.1f);
+
+ // Exceptional values.
+ EXPECT_TRUE(absl::ParseFlag("NaN", &value, &err));
+ EXPECT_TRUE(std::isnan(value));
+ EXPECT_TRUE(absl::ParseFlag("Inf", &value, &err));
+ EXPECT_TRUE(std::isinf(value));
+
+ // Hex values
+ EXPECT_TRUE(absl::ParseFlag("0x10.23p12", &value, &err));
+ EXPECT_DOUBLE_EQ(value, 66096.f);
+ EXPECT_TRUE(absl::ParseFlag("-0xF1.A3p-2", &value, &err));
+ EXPECT_NEAR(value, -60.4092f, 5e-5f);
+ EXPECT_TRUE(absl::ParseFlag("+0x0.0AAp-12", &value, &err));
+ EXPECT_NEAR(value, 1.01328e-05f, 5e-11f);
+ EXPECT_TRUE(absl::ParseFlag("0x.01p1", &value, &err));
+ EXPECT_NEAR(value, 0.0078125f, 5e-8f);
+
+ // Whitespace handling
+ EXPECT_TRUE(absl::ParseFlag("10.1 ", &value, &err));
+ EXPECT_DOUBLE_EQ(value, 10.1f);
+ EXPECT_TRUE(absl::ParseFlag(" 2.34", &value, &err));
+ EXPECT_DOUBLE_EQ(value, 2.34f);
+ EXPECT_TRUE(absl::ParseFlag(" 5.7 ", &value, &err));
+ EXPECT_DOUBLE_EQ(value, 5.7f);
+ EXPECT_TRUE(absl::ParseFlag(" -0xE0.F3p01 ", &value, &err));
+ EXPECT_NEAR(value, -449.8984375f, 5e-8f);
+
+ // Invalid values.
+ EXPECT_FALSE(absl::ParseFlag("", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag(" ", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag(" ", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("--1", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("\n", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("\t", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("2.3xxx", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("0x0.1pAA", &value, &err));
+ // TODO(rogeeff): below assertion should fail
+ EXPECT_TRUE(absl::ParseFlag("0x0.1", &value, &err));
+}
+
+// --------------------------------------------------------------------
+
+TEST(MarshallingTest, TestDoubleParsing) {
+ std::string err;
+ double value;
+
+ // Ordinary values.
+ EXPECT_TRUE(absl::ParseFlag("1.3", &value, &err));
+ EXPECT_DOUBLE_EQ(value, 1.3);
+ EXPECT_TRUE(absl::ParseFlag("-0.1", &value, &err));
+ EXPECT_DOUBLE_EQ(value, -0.1);
+ EXPECT_TRUE(absl::ParseFlag("+0.01", &value, &err));
+ EXPECT_DOUBLE_EQ(value, 0.01);
+
+ // Scientific values.
+ EXPECT_TRUE(absl::ParseFlag("1.2e3", &value, &err));
+ EXPECT_DOUBLE_EQ(value, 1.2e3);
+ EXPECT_TRUE(absl::ParseFlag("9.00000002e-123", &value, &err));
+ EXPECT_DOUBLE_EQ(value, 9.00000002e-123);
+ EXPECT_TRUE(absl::ParseFlag("0.11e+3", &value, &err));
+ EXPECT_DOUBLE_EQ(value, 0.11e+3);
+ EXPECT_TRUE(absl::ParseFlag("1.e-2300", &value, &err));
+ EXPECT_DOUBLE_EQ(value, 0);
+ EXPECT_TRUE(absl::ParseFlag("1.e+2300", &value, &err));
+ EXPECT_TRUE(std::isinf(value));
+
+ // Leading zero values.
+ EXPECT_TRUE(absl::ParseFlag("01.6", &value, &err));
+ EXPECT_DOUBLE_EQ(value, 1.6);
+ EXPECT_TRUE(absl::ParseFlag("000.0001", &value, &err));
+ EXPECT_DOUBLE_EQ(value, 0.0001);
+
+ // Trailing zero values.
+ EXPECT_TRUE(absl::ParseFlag("-5.1000", &value, &err));
+ EXPECT_DOUBLE_EQ(value, -5.1);
+
+ // Exceptional values.
+ EXPECT_TRUE(absl::ParseFlag("NaN", &value, &err));
+ EXPECT_TRUE(std::isnan(value));
+ EXPECT_TRUE(absl::ParseFlag("nan", &value, &err));
+ EXPECT_TRUE(std::isnan(value));
+ EXPECT_TRUE(absl::ParseFlag("Inf", &value, &err));
+ EXPECT_TRUE(std::isinf(value));
+ EXPECT_TRUE(absl::ParseFlag("inf", &value, &err));
+ EXPECT_TRUE(std::isinf(value));
+
+ // Hex values
+ EXPECT_TRUE(absl::ParseFlag("0x10.23p12", &value, &err));
+ EXPECT_DOUBLE_EQ(value, 66096);
+ EXPECT_TRUE(absl::ParseFlag("-0xF1.A3p-2", &value, &err));
+ EXPECT_NEAR(value, -60.4092, 5e-5);
+ EXPECT_TRUE(absl::ParseFlag("+0x0.0AAp-12", &value, &err));
+ EXPECT_NEAR(value, 1.01328e-05, 5e-11);
+ EXPECT_TRUE(absl::ParseFlag("0x.01p1", &value, &err));
+ EXPECT_NEAR(value, 0.0078125, 5e-8);
+
+ // Whitespace handling
+ EXPECT_TRUE(absl::ParseFlag("10.1 ", &value, &err));
+ EXPECT_DOUBLE_EQ(value, 10.1);
+ EXPECT_TRUE(absl::ParseFlag(" 2.34", &value, &err));
+ EXPECT_DOUBLE_EQ(value, 2.34);
+ EXPECT_TRUE(absl::ParseFlag(" 5.7 ", &value, &err));
+ EXPECT_DOUBLE_EQ(value, 5.7);
+ EXPECT_TRUE(absl::ParseFlag(" -0xE0.F3p01 ", &value, &err));
+ EXPECT_NEAR(value, -449.8984375, 5e-8);
+
+ // Invalid values.
+ EXPECT_FALSE(absl::ParseFlag("", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag(" ", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag(" ", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("--1", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("\n", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("\t", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("2.3xxx", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("0x0.1pAA", &value, &err));
+ // TODO(rogeeff): below assertion should fail
+ EXPECT_TRUE(absl::ParseFlag("0x0.1", &value, &err));
+}
+
+// --------------------------------------------------------------------
+
+TEST(MarshallingTest, TestStringParsing) {
+ std::string err;
+ std::string value;
+
+ EXPECT_TRUE(absl::ParseFlag("", &value, &err));
+ EXPECT_EQ(value, "");
+ EXPECT_TRUE(absl::ParseFlag(" ", &value, &err));
+ EXPECT_EQ(value, " ");
+ EXPECT_TRUE(absl::ParseFlag(" ", &value, &err));
+ EXPECT_EQ(value, " ");
+ EXPECT_TRUE(absl::ParseFlag("\n", &value, &err));
+ EXPECT_EQ(value, "\n");
+ EXPECT_TRUE(absl::ParseFlag("\t", &value, &err));
+ EXPECT_EQ(value, "\t");
+ EXPECT_TRUE(absl::ParseFlag("asdfg", &value, &err));
+ EXPECT_EQ(value, "asdfg");
+ EXPECT_TRUE(absl::ParseFlag("asdf ghjk", &value, &err));
+ EXPECT_EQ(value, "asdf ghjk");
+ EXPECT_TRUE(absl::ParseFlag("a\nb\nc", &value, &err));
+ EXPECT_EQ(value, "a\nb\nc");
+ EXPECT_TRUE(absl::ParseFlag("asd\0fgh", &value, &err));
+ EXPECT_EQ(value, "asd");
+ EXPECT_TRUE(absl::ParseFlag("\\\\", &value, &err));
+ EXPECT_EQ(value, "\\\\");
+}
+
+// --------------------------------------------------------------------
+
+TEST(MarshallingTest, TestVectorOfStringParsing) {
+ std::string err;
+ std::vector<std::string> value;
+
+ EXPECT_TRUE(absl::ParseFlag("", &value, &err));
+ EXPECT_EQ(value, std::vector<std::string>{});
+ EXPECT_TRUE(absl::ParseFlag("1", &value, &err));
+ EXPECT_EQ(value, std::vector<std::string>({"1"}));
+ EXPECT_TRUE(absl::ParseFlag("a,b", &value, &err));
+ EXPECT_EQ(value, std::vector<std::string>({"a", "b"}));
+ EXPECT_TRUE(absl::ParseFlag("a,b,c,", &value, &err));
+ EXPECT_EQ(value, std::vector<std::string>({"a", "b", "c", ""}));
+ EXPECT_TRUE(absl::ParseFlag("a,,", &value, &err));
+ EXPECT_EQ(value, std::vector<std::string>({"a", "", ""}));
+ EXPECT_TRUE(absl::ParseFlag(",", &value, &err));
+ EXPECT_EQ(value, std::vector<std::string>({"", ""}));
+ EXPECT_TRUE(absl::ParseFlag("a, b,c ", &value, &err));
+ EXPECT_EQ(value, std::vector<std::string>({"a", " b", "c "}));
+}
+
+// --------------------------------------------------------------------
+
+TEST(MarshallingTest, TestBoolUnparsing) {
+ EXPECT_EQ(absl::UnparseFlag(true), "true");
+ EXPECT_EQ(absl::UnparseFlag(false), "false");
+}
+
+// --------------------------------------------------------------------
+
+TEST(MarshallingTest, TestInt16Unparsing) {
+ int16_t value;
+
+ value = 1;
+ EXPECT_EQ(absl::UnparseFlag(value), "1");
+ value = 0;
+ EXPECT_EQ(absl::UnparseFlag(value), "0");
+ value = -1;
+ EXPECT_EQ(absl::UnparseFlag(value), "-1");
+ value = 9876;
+ EXPECT_EQ(absl::UnparseFlag(value), "9876");
+ value = -987;
+ EXPECT_EQ(absl::UnparseFlag(value), "-987");
+}
+
+// --------------------------------------------------------------------
+
+TEST(MarshallingTest, TestUint16Unparsing) {
+ uint16_t value;
+
+ value = 1;
+ EXPECT_EQ(absl::UnparseFlag(value), "1");
+ value = 0;
+ EXPECT_EQ(absl::UnparseFlag(value), "0");
+ value = 19876;
+ EXPECT_EQ(absl::UnparseFlag(value), "19876");
+}
+
+// --------------------------------------------------------------------
+
+TEST(MarshallingTest, TestInt32Unparsing) {
+ int32_t value;
+
+ value = 1;
+ EXPECT_EQ(absl::UnparseFlag(value), "1");
+ value = 0;
+ EXPECT_EQ(absl::UnparseFlag(value), "0");
+ value = -1;
+ EXPECT_EQ(absl::UnparseFlag(value), "-1");
+ value = 12345;
+ EXPECT_EQ(absl::UnparseFlag(value), "12345");
+ value = -987;
+ EXPECT_EQ(absl::UnparseFlag(value), "-987");
+}
+
+// --------------------------------------------------------------------
+
+TEST(MarshallingTest, TestUint32Unparsing) {
+ uint32_t value;
+
+ value = 1;
+ EXPECT_EQ(absl::UnparseFlag(value), "1");
+ value = 0;
+ EXPECT_EQ(absl::UnparseFlag(value), "0");
+ value = 1234500;
+ EXPECT_EQ(absl::UnparseFlag(value), "1234500");
+}
+
+// --------------------------------------------------------------------
+
+TEST(MarshallingTest, TestInt64Unparsing) {
+ int64_t value;
+
+ value = 1;
+ EXPECT_EQ(absl::UnparseFlag(value), "1");
+ value = 0;
+ EXPECT_EQ(absl::UnparseFlag(value), "0");
+ value = -1;
+ EXPECT_EQ(absl::UnparseFlag(value), "-1");
+ value = 123456789L;
+ EXPECT_EQ(absl::UnparseFlag(value), "123456789");
+ value = -987654321L;
+ EXPECT_EQ(absl::UnparseFlag(value), "-987654321");
+ value = 0x7FFFFFFFFFFFFFFF;
+ EXPECT_EQ(absl::UnparseFlag(value), "9223372036854775807");
+ value = 0xFFFFFFFFFFFFFFFF;
+ EXPECT_EQ(absl::UnparseFlag(value), "-1");
+}
+
+// --------------------------------------------------------------------
+
+TEST(MarshallingTest, TestUint64Unparsing) {
+ uint64_t value;
+
+ value = 1;
+ EXPECT_EQ(absl::UnparseFlag(value), "1");
+ value = 0;
+ EXPECT_EQ(absl::UnparseFlag(value), "0");
+ value = 123456789L;
+ EXPECT_EQ(absl::UnparseFlag(value), "123456789");
+ value = 0xFFFFFFFFFFFFFFFF;
+ EXPECT_EQ(absl::UnparseFlag(value), "18446744073709551615");
+}
+
+// --------------------------------------------------------------------
+
+TEST(MarshallingTest, TestFloatUnparsing) {
+ float value;
+
+ value = 1.1f;
+ EXPECT_EQ(absl::UnparseFlag(value), "1.1");
+ value = 0.01f;
+ EXPECT_EQ(absl::UnparseFlag(value), "0.01");
+ value = 1.23e-2f;
+ EXPECT_EQ(absl::UnparseFlag(value), "0.0123");
+ value = -0.71f;
+ EXPECT_EQ(absl::UnparseFlag(value), "-0.71");
+}
+
+// --------------------------------------------------------------------
+
+TEST(MarshallingTest, TestDoubleUnparsing) {
+ double value;
+
+ value = 1.1;
+ EXPECT_EQ(absl::UnparseFlag(value), "1.1");
+ value = 0.01;
+ EXPECT_EQ(absl::UnparseFlag(value), "0.01");
+ value = 1.23e-2;
+ EXPECT_EQ(absl::UnparseFlag(value), "0.0123");
+ value = -0.71;
+ EXPECT_EQ(absl::UnparseFlag(value), "-0.71");
+ value = -0;
+ EXPECT_EQ(absl::UnparseFlag(value), "0");
+ value = std::nan("");
+ EXPECT_EQ(absl::UnparseFlag(value), "nan");
+ value = std::numeric_limits<double>::infinity();
+ EXPECT_EQ(absl::UnparseFlag(value), "inf");
+}
+
+// --------------------------------------------------------------------
+
+TEST(MarshallingTest, TestStringUnparsing) {
+ EXPECT_EQ(absl::UnparseFlag(""), "");
+ EXPECT_EQ(absl::UnparseFlag(" "), " ");
+ EXPECT_EQ(absl::UnparseFlag("qwerty"), "qwerty");
+ EXPECT_EQ(absl::UnparseFlag("ASDFGH"), "ASDFGH");
+ EXPECT_EQ(absl::UnparseFlag("\n\t "), "\n\t ");
+}
+
+// --------------------------------------------------------------------
+
+template <typename T>
+void TestRoundtrip(T v) {
+ T new_v;
+ std::string err;
+ EXPECT_TRUE(absl::ParseFlag(absl::UnparseFlag(v), &new_v, &err));
+ EXPECT_EQ(new_v, v);
+}
+
+TEST(MarshallingTest, TestFloatRoundTrip) {
+ TestRoundtrip(0.1f);
+ TestRoundtrip(0.12f);
+ TestRoundtrip(0.123f);
+ TestRoundtrip(0.1234f);
+ TestRoundtrip(0.12345f);
+ TestRoundtrip(0.123456f);
+ TestRoundtrip(0.1234567f);
+ TestRoundtrip(0.12345678f);
+
+ TestRoundtrip(0.1e20f);
+ TestRoundtrip(0.12e20f);
+ TestRoundtrip(0.123e20f);
+ TestRoundtrip(0.1234e20f);
+ TestRoundtrip(0.12345e20f);
+ TestRoundtrip(0.123456e20f);
+ TestRoundtrip(0.1234567e20f);
+ TestRoundtrip(0.12345678e20f);
+
+ TestRoundtrip(0.1e-20f);
+ TestRoundtrip(0.12e-20f);
+ TestRoundtrip(0.123e-20f);
+ TestRoundtrip(0.1234e-20f);
+ TestRoundtrip(0.12345e-20f);
+ TestRoundtrip(0.123456e-20f);
+ TestRoundtrip(0.1234567e-20f);
+ TestRoundtrip(0.12345678e-20f);
+}
+
+TEST(MarshallingTest, TestDoubleRoundTrip) {
+ TestRoundtrip(0.1);
+ TestRoundtrip(0.12);
+ TestRoundtrip(0.123);
+ TestRoundtrip(0.1234);
+ TestRoundtrip(0.12345);
+ TestRoundtrip(0.123456);
+ TestRoundtrip(0.1234567);
+ TestRoundtrip(0.12345678);
+ TestRoundtrip(0.123456789);
+ TestRoundtrip(0.1234567891);
+ TestRoundtrip(0.12345678912);
+ TestRoundtrip(0.123456789123);
+ TestRoundtrip(0.1234567891234);
+ TestRoundtrip(0.12345678912345);
+ TestRoundtrip(0.123456789123456);
+ TestRoundtrip(0.1234567891234567);
+ TestRoundtrip(0.12345678912345678);
+
+ TestRoundtrip(0.1e50);
+ TestRoundtrip(0.12e50);
+ TestRoundtrip(0.123e50);
+ TestRoundtrip(0.1234e50);
+ TestRoundtrip(0.12345e50);
+ TestRoundtrip(0.123456e50);
+ TestRoundtrip(0.1234567e50);
+ TestRoundtrip(0.12345678e50);
+ TestRoundtrip(0.123456789e50);
+ TestRoundtrip(0.1234567891e50);
+ TestRoundtrip(0.12345678912e50);
+ TestRoundtrip(0.123456789123e50);
+ TestRoundtrip(0.1234567891234e50);
+ TestRoundtrip(0.12345678912345e50);
+ TestRoundtrip(0.123456789123456e50);
+ TestRoundtrip(0.1234567891234567e50);
+ TestRoundtrip(0.12345678912345678e50);
+
+ TestRoundtrip(0.1e-50);
+ TestRoundtrip(0.12e-50);
+ TestRoundtrip(0.123e-50);
+ TestRoundtrip(0.1234e-50);
+ TestRoundtrip(0.12345e-50);
+ TestRoundtrip(0.123456e-50);
+ TestRoundtrip(0.1234567e-50);
+ TestRoundtrip(0.12345678e-50);
+ TestRoundtrip(0.123456789e-50);
+ TestRoundtrip(0.1234567891e-50);
+ TestRoundtrip(0.12345678912e-50);
+ TestRoundtrip(0.123456789123e-50);
+ TestRoundtrip(0.1234567891234e-50);
+ TestRoundtrip(0.12345678912345e-50);
+ TestRoundtrip(0.123456789123456e-50);
+ TestRoundtrip(0.1234567891234567e-50);
+ TestRoundtrip(0.12345678912345678e-50);
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/flags/parse.cc b/third_party/abseil/src/absl/flags/parse.cc
new file mode 100644
index 0000000..dd1a679
--- /dev/null
+++ b/third_party/abseil/src/absl/flags/parse.cc
@@ -0,0 +1,823 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/flags/parse.h"
+
+#include <stdlib.h>
+
+#include <algorithm>
+#include <fstream>
+#include <iostream>
+#include <iterator>
+#include <string>
+#include <tuple>
+#include <utility>
+#include <vector>
+
+#ifdef _WIN32
+#include <windows.h>
+#endif
+
+#include "absl/base/attributes.h"
+#include "absl/base/config.h"
+#include "absl/base/const_init.h"
+#include "absl/base/thread_annotations.h"
+#include "absl/flags/commandlineflag.h"
+#include "absl/flags/config.h"
+#include "absl/flags/flag.h"
+#include "absl/flags/internal/commandlineflag.h"
+#include "absl/flags/internal/flag.h"
+#include "absl/flags/internal/parse.h"
+#include "absl/flags/internal/private_handle_accessor.h"
+#include "absl/flags/internal/program_name.h"
+#include "absl/flags/internal/usage.h"
+#include "absl/flags/reflection.h"
+#include "absl/flags/usage.h"
+#include "absl/flags/usage_config.h"
+#include "absl/strings/ascii.h"
+#include "absl/strings/str_cat.h"
+#include "absl/strings/string_view.h"
+#include "absl/strings/strip.h"
+#include "absl/synchronization/mutex.h"
+
+// --------------------------------------------------------------------
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace flags_internal {
+namespace {
+
+ABSL_CONST_INIT absl::Mutex processing_checks_guard(absl::kConstInit);
+
+ABSL_CONST_INIT bool flagfile_needs_processing
+ ABSL_GUARDED_BY(processing_checks_guard) = false;
+ABSL_CONST_INIT bool fromenv_needs_processing
+ ABSL_GUARDED_BY(processing_checks_guard) = false;
+ABSL_CONST_INIT bool tryfromenv_needs_processing
+ ABSL_GUARDED_BY(processing_checks_guard) = false;
+
+ABSL_CONST_INIT absl::Mutex specified_flags_guard(absl::kConstInit);
+ABSL_CONST_INIT std::vector<const CommandLineFlag*>* specified_flags
+ ABSL_GUARDED_BY(specified_flags_guard) = nullptr;
+
+struct SpecifiedFlagsCompare {
+ bool operator()(const CommandLineFlag* a, const CommandLineFlag* b) const {
+ return a->Name() < b->Name();
+ }
+ bool operator()(const CommandLineFlag* a, absl::string_view b) const {
+ return a->Name() < b;
+ }
+ bool operator()(absl::string_view a, const CommandLineFlag* b) const {
+ return a < b->Name();
+ }
+};
+
+} // namespace
+} // namespace flags_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+ABSL_FLAG(std::vector<std::string>, flagfile, {},
+ "comma-separated list of files to load flags from")
+ .OnUpdate([]() {
+ if (absl::GetFlag(FLAGS_flagfile).empty()) return;
+
+ absl::MutexLock l(&absl::flags_internal::processing_checks_guard);
+
+ // Setting this flag twice before it is handled most likely an internal
+ // error and should be reviewed by developers.
+ if (absl::flags_internal::flagfile_needs_processing) {
+ ABSL_INTERNAL_LOG(WARNING, "flagfile set twice before it is handled");
+ }
+
+ absl::flags_internal::flagfile_needs_processing = true;
+ });
+ABSL_FLAG(std::vector<std::string>, fromenv, {},
+ "comma-separated list of flags to set from the environment"
+ " [use 'export FLAGS_flag1=value']")
+ .OnUpdate([]() {
+ if (absl::GetFlag(FLAGS_fromenv).empty()) return;
+
+ absl::MutexLock l(&absl::flags_internal::processing_checks_guard);
+
+ // Setting this flag twice before it is handled most likely an internal
+ // error and should be reviewed by developers.
+ if (absl::flags_internal::fromenv_needs_processing) {
+ ABSL_INTERNAL_LOG(WARNING, "fromenv set twice before it is handled.");
+ }
+
+ absl::flags_internal::fromenv_needs_processing = true;
+ });
+ABSL_FLAG(std::vector<std::string>, tryfromenv, {},
+ "comma-separated list of flags to try to set from the environment if "
+ "present")
+ .OnUpdate([]() {
+ if (absl::GetFlag(FLAGS_tryfromenv).empty()) return;
+
+ absl::MutexLock l(&absl::flags_internal::processing_checks_guard);
+
+ // Setting this flag twice before it is handled most likely an internal
+ // error and should be reviewed by developers.
+ if (absl::flags_internal::tryfromenv_needs_processing) {
+ ABSL_INTERNAL_LOG(WARNING,
+ "tryfromenv set twice before it is handled.");
+ }
+
+ absl::flags_internal::tryfromenv_needs_processing = true;
+ });
+
+ABSL_FLAG(std::vector<std::string>, undefok, {},
+ "comma-separated list of flag names that it is okay to specify "
+ "on the command line even if the program does not define a flag "
+ "with that name");
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace flags_internal {
+
+namespace {
+
+class ArgsList {
+ public:
+ ArgsList() : next_arg_(0) {}
+ ArgsList(int argc, char* argv[]) : args_(argv, argv + argc), next_arg_(0) {}
+ explicit ArgsList(const std::vector<std::string>& args)
+ : args_(args), next_arg_(0) {}
+
+ // Returns success status: true if parsing successful, false otherwise.
+ bool ReadFromFlagfile(const std::string& flag_file_name);
+
+ int Size() const { return args_.size() - next_arg_; }
+ int FrontIndex() const { return next_arg_; }
+ absl::string_view Front() const { return args_[next_arg_]; }
+ void PopFront() { next_arg_++; }
+
+ private:
+ std::vector<std::string> args_;
+ int next_arg_;
+};
+
+bool ArgsList::ReadFromFlagfile(const std::string& flag_file_name) {
+ std::ifstream flag_file(flag_file_name);
+
+ if (!flag_file) {
+ flags_internal::ReportUsageError(
+ absl::StrCat("Can't open flagfile ", flag_file_name), true);
+
+ return false;
+ }
+
+ // This argument represents fake argv[0], which should be present in all arg
+ // lists.
+ args_.push_back("");
+
+ std::string line;
+ bool success = true;
+
+ while (std::getline(flag_file, line)) {
+ absl::string_view stripped = absl::StripLeadingAsciiWhitespace(line);
+
+ if (stripped.empty() || stripped[0] == '#') {
+ // Comment or empty line; just ignore.
+ continue;
+ }
+
+ if (stripped[0] == '-') {
+ if (stripped == "--") {
+ flags_internal::ReportUsageError(
+ "Flagfile can't contain position arguments or --", true);
+
+ success = false;
+ break;
+ }
+
+ args_.push_back(std::string(stripped));
+ continue;
+ }
+
+ flags_internal::ReportUsageError(
+ absl::StrCat("Unexpected line in the flagfile ", flag_file_name, ": ",
+ line),
+ true);
+
+ success = false;
+ }
+
+ return success;
+}
+
+// --------------------------------------------------------------------
+
+// Reads the environment variable with name `name` and stores results in
+// `value`. If variable is not present in environment returns false, otherwise
+// returns true.
+bool GetEnvVar(const char* var_name, std::string& var_value) {
+#ifdef _WIN32
+ char buf[1024];
+ auto get_res = GetEnvironmentVariableA(var_name, buf, sizeof(buf));
+ if (get_res >= sizeof(buf)) {
+ return false;
+ }
+
+ if (get_res == 0) {
+ return false;
+ }
+
+ var_value = std::string(buf, get_res);
+#else
+ const char* val = ::getenv(var_name);
+ if (val == nullptr) {
+ return false;
+ }
+
+ var_value = val;
+#endif
+
+ return true;
+}
+
+// --------------------------------------------------------------------
+
+// Returns:
+// Flag name or empty if arg= --
+// Flag value after = in --flag=value (empty if --foo)
+// "Is empty value" status. True if arg= --foo=, false otherwise. This is
+// required to separate --foo from --foo=.
+// For example:
+// arg return values
+// "--foo=bar" -> {"foo", "bar", false}.
+// "--foo" -> {"foo", "", false}.
+// "--foo=" -> {"foo", "", true}.
+std::tuple<absl::string_view, absl::string_view, bool> SplitNameAndValue(
+ absl::string_view arg) {
+ // Allow -foo and --foo
+ absl::ConsumePrefix(&arg, "-");
+
+ if (arg.empty()) {
+ return std::make_tuple("", "", false);
+ }
+
+ auto equal_sign_pos = arg.find("=");
+
+ absl::string_view flag_name = arg.substr(0, equal_sign_pos);
+
+ absl::string_view value;
+ bool is_empty_value = false;
+
+ if (equal_sign_pos != absl::string_view::npos) {
+ value = arg.substr(equal_sign_pos + 1);
+ is_empty_value = value.empty();
+ }
+
+ return std::make_tuple(flag_name, value, is_empty_value);
+}
+
+// --------------------------------------------------------------------
+
+// Returns:
+// found flag or nullptr
+// is negative in case of --nofoo
+std::tuple<CommandLineFlag*, bool> LocateFlag(absl::string_view flag_name) {
+ CommandLineFlag* flag = absl::FindCommandLineFlag(flag_name);
+ bool is_negative = false;
+
+ if (!flag && absl::ConsumePrefix(&flag_name, "no")) {
+ flag = absl::FindCommandLineFlag(flag_name);
+ is_negative = true;
+ }
+
+ return std::make_tuple(flag, is_negative);
+}
+
+// --------------------------------------------------------------------
+
+// Verify that default values of typed flags must be convertible to string and
+// back.
+void CheckDefaultValuesParsingRoundtrip() {
+#ifndef NDEBUG
+ flags_internal::ForEachFlag([&](CommandLineFlag& flag) {
+ if (flag.IsRetired()) return;
+
+#define ABSL_FLAGS_INTERNAL_IGNORE_TYPE(T, _) \
+ if (flag.IsOfType<T>()) return;
+
+ ABSL_FLAGS_INTERNAL_SUPPORTED_TYPES(ABSL_FLAGS_INTERNAL_IGNORE_TYPE)
+#undef ABSL_FLAGS_INTERNAL_IGNORE_TYPE
+
+ flags_internal::PrivateHandleAccessor::CheckDefaultValueParsingRoundtrip(
+ flag);
+ });
+#endif
+}
+
+// --------------------------------------------------------------------
+
+// Returns success status, which is true if we successfully read all flag files,
+// in which case new ArgLists are appended to the input_args in a reverse order
+// of file names in the input flagfiles list. This order ensures that flags from
+// the first flagfile in the input list are processed before the second flagfile
+// etc.
+bool ReadFlagfiles(const std::vector<std::string>& flagfiles,
+ std::vector<ArgsList>& input_args) {
+ bool success = true;
+ for (auto it = flagfiles.rbegin(); it != flagfiles.rend(); ++it) {
+ ArgsList al;
+
+ if (al.ReadFromFlagfile(*it)) {
+ input_args.push_back(al);
+ } else {
+ success = false;
+ }
+ }
+
+ return success;
+}
+
+// Returns success status, which is true if were able to locate all environment
+// variables correctly or if fail_on_absent_in_env is false. The environment
+// variable names are expected to be of the form `FLAGS_<flag_name>`, where
+// `flag_name` is a string from the input flag_names list. If successful we
+// append a single ArgList at the end of the input_args.
+bool ReadFlagsFromEnv(const std::vector<std::string>& flag_names,
+ std::vector<ArgsList>& input_args,
+ bool fail_on_absent_in_env) {
+ bool success = true;
+ std::vector<std::string> args;
+
+ // This argument represents fake argv[0], which should be present in all arg
+ // lists.
+ args.push_back("");
+
+ for (const auto& flag_name : flag_names) {
+ // Avoid infinite recursion.
+ if (flag_name == "fromenv" || flag_name == "tryfromenv") {
+ flags_internal::ReportUsageError(
+ absl::StrCat("Infinite recursion on flag ", flag_name), true);
+
+ success = false;
+ continue;
+ }
+
+ const std::string envname = absl::StrCat("FLAGS_", flag_name);
+ std::string envval;
+ if (!GetEnvVar(envname.c_str(), envval)) {
+ if (fail_on_absent_in_env) {
+ flags_internal::ReportUsageError(
+ absl::StrCat(envname, " not found in environment"), true);
+
+ success = false;
+ }
+
+ continue;
+ }
+
+ args.push_back(absl::StrCat("--", flag_name, "=", envval));
+ }
+
+ if (success) {
+ input_args.emplace_back(args);
+ }
+
+ return success;
+}
+
+// --------------------------------------------------------------------
+
+// Returns success status, which is true if were able to handle all generator
+// flags (flagfile, fromenv, tryfromemv) successfully.
+bool HandleGeneratorFlags(std::vector<ArgsList>& input_args,
+ std::vector<std::string>& flagfile_value) {
+ bool success = true;
+
+ absl::MutexLock l(&flags_internal::processing_checks_guard);
+
+ // flagfile could have been set either on a command line or
+ // programmatically before invoking ParseCommandLine. Note that we do not
+ // actually process arguments specified in the flagfile, but instead
+ // create a secondary arguments list to be processed along with the rest
+ // of the comamnd line arguments. Since we always the process most recently
+ // created list of arguments first, this will result in flagfile argument
+ // being processed before any other argument in the command line. If
+ // FLAGS_flagfile contains more than one file name we create multiple new
+ // levels of arguments in a reverse order of file names. Thus we always
+ // process arguments from first file before arguments containing in a
+ // second file, etc. If flagfile contains another
+ // --flagfile inside of it, it will produce new level of arguments and
+ // processed before the rest of the flagfile. We are also collecting all
+ // flagfiles set on original command line. Unlike the rest of the flags,
+ // this flag can be set multiple times and is expected to be handled
+ // multiple times. We are collecting them all into a single list and set
+ // the value of FLAGS_flagfile to that value at the end of the parsing.
+ if (flags_internal::flagfile_needs_processing) {
+ auto flagfiles = absl::GetFlag(FLAGS_flagfile);
+
+ if (input_args.size() == 1) {
+ flagfile_value.insert(flagfile_value.end(), flagfiles.begin(),
+ flagfiles.end());
+ }
+
+ success &= ReadFlagfiles(flagfiles, input_args);
+
+ flags_internal::flagfile_needs_processing = false;
+ }
+
+ // Similar to flagfile fromenv/tryfromemv can be set both
+ // programmatically and at runtime on a command line. Unlike flagfile these
+ // can't be recursive.
+ if (flags_internal::fromenv_needs_processing) {
+ auto flags_list = absl::GetFlag(FLAGS_fromenv);
+
+ success &= ReadFlagsFromEnv(flags_list, input_args, true);
+
+ flags_internal::fromenv_needs_processing = false;
+ }
+
+ if (flags_internal::tryfromenv_needs_processing) {
+ auto flags_list = absl::GetFlag(FLAGS_tryfromenv);
+
+ success &= ReadFlagsFromEnv(flags_list, input_args, false);
+
+ flags_internal::tryfromenv_needs_processing = false;
+ }
+
+ return success;
+}
+
+// --------------------------------------------------------------------
+
+void ResetGeneratorFlags(const std::vector<std::string>& flagfile_value) {
+ // Setting flagfile to the value which collates all the values set on a
+ // command line and programmatically. So if command line looked like
+ // --flagfile=f1 --flagfile=f2 the final value of the FLAGS_flagfile flag is
+ // going to be {"f1", "f2"}
+ if (!flagfile_value.empty()) {
+ absl::SetFlag(&FLAGS_flagfile, flagfile_value);
+ absl::MutexLock l(&flags_internal::processing_checks_guard);
+ flags_internal::flagfile_needs_processing = false;
+ }
+
+ // fromenv/tryfromenv are set to <undefined> value.
+ if (!absl::GetFlag(FLAGS_fromenv).empty()) {
+ absl::SetFlag(&FLAGS_fromenv, {});
+ }
+ if (!absl::GetFlag(FLAGS_tryfromenv).empty()) {
+ absl::SetFlag(&FLAGS_tryfromenv, {});
+ }
+
+ absl::MutexLock l(&flags_internal::processing_checks_guard);
+ flags_internal::fromenv_needs_processing = false;
+ flags_internal::tryfromenv_needs_processing = false;
+}
+
+// --------------------------------------------------------------------
+
+// Returns:
+// success status
+// deduced value
+// We are also mutating curr_list in case if we need to get a hold of next
+// argument in the input.
+std::tuple<bool, absl::string_view> DeduceFlagValue(const CommandLineFlag& flag,
+ absl::string_view value,
+ bool is_negative,
+ bool is_empty_value,
+ ArgsList* curr_list) {
+ // Value is either an argument suffix after `=` in "--foo=<value>"
+ // or separate argument in case of "--foo" "<value>".
+
+ // boolean flags have these forms:
+ // --foo
+ // --nofoo
+ // --foo=true
+ // --foo=false
+ // --nofoo=<value> is not supported
+ // --foo <value> is not supported
+
+ // non boolean flags have these forms:
+ // --foo=<value>
+ // --foo <value>
+ // --nofoo is not supported
+
+ if (flag.IsOfType<bool>()) {
+ if (value.empty()) {
+ if (is_empty_value) {
+ // "--bool_flag=" case
+ flags_internal::ReportUsageError(
+ absl::StrCat(
+ "Missing the value after assignment for the boolean flag '",
+ flag.Name(), "'"),
+ true);
+ return std::make_tuple(false, "");
+ }
+
+ // "--bool_flag" case
+ value = is_negative ? "0" : "1";
+ } else if (is_negative) {
+ // "--nobool_flag=Y" case
+ flags_internal::ReportUsageError(
+ absl::StrCat("Negative form with assignment is not valid for the "
+ "boolean flag '",
+ flag.Name(), "'"),
+ true);
+ return std::make_tuple(false, "");
+ }
+ } else if (is_negative) {
+ // "--noint_flag=1" case
+ flags_internal::ReportUsageError(
+ absl::StrCat("Negative form is not valid for the flag '", flag.Name(),
+ "'"),
+ true);
+ return std::make_tuple(false, "");
+ } else if (value.empty() && (!is_empty_value)) {
+ if (curr_list->Size() == 1) {
+ // "--int_flag" case
+ flags_internal::ReportUsageError(
+ absl::StrCat("Missing the value for the flag '", flag.Name(), "'"),
+ true);
+ return std::make_tuple(false, "");
+ }
+
+ // "--int_flag" "10" case
+ curr_list->PopFront();
+ value = curr_list->Front();
+
+ // Heuristic to detect the case where someone treats a string arg
+ // like a bool or just forgets to pass a value:
+ // --my_string_var --foo=bar
+ // We look for a flag of string type, whose value begins with a
+ // dash and corresponds to known flag or standalone --.
+ if (!value.empty() && value[0] == '-' && flag.IsOfType<std::string>()) {
+ auto maybe_flag_name = std::get<0>(SplitNameAndValue(value.substr(1)));
+
+ if (maybe_flag_name.empty() ||
+ std::get<0>(LocateFlag(maybe_flag_name)) != nullptr) {
+ // "--string_flag" "--known_flag" case
+ ABSL_INTERNAL_LOG(
+ WARNING,
+ absl::StrCat("Did you really mean to set flag '", flag.Name(),
+ "' to the value '", value, "'?"));
+ }
+ }
+ }
+
+ return std::make_tuple(true, value);
+}
+
+// --------------------------------------------------------------------
+
+bool CanIgnoreUndefinedFlag(absl::string_view flag_name) {
+ auto undefok = absl::GetFlag(FLAGS_undefok);
+ if (std::find(undefok.begin(), undefok.end(), flag_name) != undefok.end()) {
+ return true;
+ }
+
+ if (absl::ConsumePrefix(&flag_name, "no") &&
+ std::find(undefok.begin(), undefok.end(), flag_name) != undefok.end()) {
+ return true;
+ }
+
+ return false;
+}
+
+} // namespace
+
+// --------------------------------------------------------------------
+
+bool WasPresentOnCommandLine(absl::string_view flag_name) {
+ absl::MutexLock l(&specified_flags_guard);
+ ABSL_INTERNAL_CHECK(specified_flags != nullptr,
+ "ParseCommandLine is not invoked yet");
+
+ return std::binary_search(specified_flags->begin(), specified_flags->end(),
+ flag_name, SpecifiedFlagsCompare{});
+}
+
+// --------------------------------------------------------------------
+
+std::vector<char*> ParseCommandLineImpl(int argc, char* argv[],
+ ArgvListAction arg_list_act,
+ UsageFlagsAction usage_flag_act,
+ OnUndefinedFlag on_undef_flag) {
+ ABSL_INTERNAL_CHECK(argc > 0, "Missing argv[0]");
+
+ // Once parsing has started we will not have more flag registrations.
+ // If we did, they would be missing during parsing, which is a problem on
+ // itself.
+ flags_internal::FinalizeRegistry();
+
+ // This routine does not return anything since we abort on failure.
+ CheckDefaultValuesParsingRoundtrip();
+
+ std::vector<std::string> flagfile_value;
+
+ std::vector<ArgsList> input_args;
+ input_args.push_back(ArgsList(argc, argv));
+
+ std::vector<char*> output_args;
+ std::vector<char*> positional_args;
+ output_args.reserve(argc);
+
+ // This is the list of undefined flags. The element of the list is the pair
+ // consisting of boolean indicating if flag came from command line (vs from
+ // some flag file we've read) and flag name.
+ // TODO(rogeeff): Eliminate the first element in the pair after cleanup.
+ std::vector<std::pair<bool, std::string>> undefined_flag_names;
+
+ // Set program invocation name if it is not set before.
+ if (ProgramInvocationName() == "UNKNOWN") {
+ flags_internal::SetProgramInvocationName(argv[0]);
+ }
+ output_args.push_back(argv[0]);
+
+ absl::MutexLock l(&specified_flags_guard);
+ if (specified_flags == nullptr) {
+ specified_flags = new std::vector<const CommandLineFlag*>;
+ } else {
+ specified_flags->clear();
+ }
+
+ // Iterate through the list of the input arguments. First level are arguments
+ // originated from argc/argv. Following levels are arguments originated from
+ // recursive parsing of flagfile(s).
+ bool success = true;
+ while (!input_args.empty()) {
+ // 10. First we process the built-in generator flags.
+ success &= HandleGeneratorFlags(input_args, flagfile_value);
+
+ // 30. Select top-most (most recent) arguments list. If it is empty drop it
+ // and re-try.
+ ArgsList& curr_list = input_args.back();
+
+ curr_list.PopFront();
+
+ if (curr_list.Size() == 0) {
+ input_args.pop_back();
+ continue;
+ }
+
+ // 40. Pick up the front remaining argument in the current list. If current
+ // stack of argument lists contains only one element - we are processing an
+ // argument from the original argv.
+ absl::string_view arg(curr_list.Front());
+ bool arg_from_argv = input_args.size() == 1;
+
+ // 50. If argument does not start with - or is just "-" - this is
+ // positional argument.
+ if (!absl::ConsumePrefix(&arg, "-") || arg.empty()) {
+ ABSL_INTERNAL_CHECK(arg_from_argv,
+ "Flagfile cannot contain positional argument");
+
+ positional_args.push_back(argv[curr_list.FrontIndex()]);
+ continue;
+ }
+
+ if (arg_from_argv && (arg_list_act == ArgvListAction::kKeepParsedArgs)) {
+ output_args.push_back(argv[curr_list.FrontIndex()]);
+ }
+
+ // 60. Split the current argument on '=' to figure out the argument
+ // name and value. If flag name is empty it means we've got "--". value
+ // can be empty either if there were no '=' in argument string at all or
+ // an argument looked like "--foo=". In a latter case is_empty_value is
+ // true.
+ absl::string_view flag_name;
+ absl::string_view value;
+ bool is_empty_value = false;
+
+ std::tie(flag_name, value, is_empty_value) = SplitNameAndValue(arg);
+
+ // 70. "--" alone means what it does for GNU: stop flags parsing. We do
+ // not support positional arguments in flagfiles, so we just drop them.
+ if (flag_name.empty()) {
+ ABSL_INTERNAL_CHECK(arg_from_argv,
+ "Flagfile cannot contain positional argument");
+
+ curr_list.PopFront();
+ break;
+ }
+
+ // 80. Locate the flag based on flag name. Handle both --foo and --nofoo
+ CommandLineFlag* flag = nullptr;
+ bool is_negative = false;
+ std::tie(flag, is_negative) = LocateFlag(flag_name);
+
+ if (flag == nullptr) {
+ // Usage flags are not modeled as Abseil flags. Locate them separately.
+ if (flags_internal::DeduceUsageFlags(flag_name, value)) {
+ continue;
+ }
+
+ if (on_undef_flag != OnUndefinedFlag::kIgnoreUndefined) {
+ undefined_flag_names.emplace_back(arg_from_argv,
+ std::string(flag_name));
+ }
+ continue;
+ }
+
+ // 90. Deduce flag's value (from this or next argument)
+ auto curr_index = curr_list.FrontIndex();
+ bool value_success = true;
+ std::tie(value_success, value) =
+ DeduceFlagValue(*flag, value, is_negative, is_empty_value, &curr_list);
+ success &= value_success;
+
+ // If above call consumed an argument, it was a standalone value
+ if (arg_from_argv && (arg_list_act == ArgvListAction::kKeepParsedArgs) &&
+ (curr_index != curr_list.FrontIndex())) {
+ output_args.push_back(argv[curr_list.FrontIndex()]);
+ }
+
+ // 100. Set the located flag to a new new value, unless it is retired.
+ // Setting retired flag fails, but we ignoring it here while also reporting
+ // access to retired flag.
+ std::string error;
+ if (!flags_internal::PrivateHandleAccessor::ParseFrom(
+ *flag, value, SET_FLAGS_VALUE, kCommandLine, error)) {
+ if (flag->IsRetired()) continue;
+
+ flags_internal::ReportUsageError(error, true);
+ success = false;
+ } else {
+ specified_flags->push_back(flag);
+ }
+ }
+
+ for (const auto& flag_name : undefined_flag_names) {
+ if (CanIgnoreUndefinedFlag(flag_name.second)) continue;
+
+ flags_internal::ReportUsageError(
+ absl::StrCat("Unknown command line flag '", flag_name.second, "'"),
+ true);
+
+ success = false;
+ }
+
+#if ABSL_FLAGS_STRIP_NAMES
+ if (!success) {
+ flags_internal::ReportUsageError(
+ "NOTE: command line flags are disabled in this build", true);
+ }
+#endif
+
+ if (!success) {
+ flags_internal::HandleUsageFlags(std::cout,
+ ProgramUsageMessage());
+ std::exit(1);
+ }
+
+ if (usage_flag_act == UsageFlagsAction::kHandleUsage) {
+ int exit_code = flags_internal::HandleUsageFlags(
+ std::cout, ProgramUsageMessage());
+
+ if (exit_code != -1) {
+ std::exit(exit_code);
+ }
+ }
+
+ ResetGeneratorFlags(flagfile_value);
+
+ // Reinstate positional args which were intermixed with flags in the arguments
+ // list.
+ for (auto arg : positional_args) {
+ output_args.push_back(arg);
+ }
+
+ // All the remaining arguments are positional.
+ if (!input_args.empty()) {
+ for (int arg_index = input_args.back().FrontIndex(); arg_index < argc;
+ ++arg_index) {
+ output_args.push_back(argv[arg_index]);
+ }
+ }
+
+ // Trim and sort the vector.
+ specified_flags->shrink_to_fit();
+ std::sort(specified_flags->begin(), specified_flags->end(),
+ SpecifiedFlagsCompare{});
+ return output_args;
+}
+
+} // namespace flags_internal
+
+// --------------------------------------------------------------------
+
+std::vector<char*> ParseCommandLine(int argc, char* argv[]) {
+ return flags_internal::ParseCommandLineImpl(
+ argc, argv, flags_internal::ArgvListAction::kRemoveParsedArgs,
+ flags_internal::UsageFlagsAction::kHandleUsage,
+ flags_internal::OnUndefinedFlag::kAbortIfUndefined);
+}
+
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/flags/parse.h b/third_party/abseil/src/absl/flags/parse.h
new file mode 100644
index 0000000..929de2c
--- /dev/null
+++ b/third_party/abseil/src/absl/flags/parse.h
@@ -0,0 +1,60 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: parse.h
+// -----------------------------------------------------------------------------
+//
+// This file defines the main parsing function for Abseil flags:
+// `absl::ParseCommandLine()`.
+
+#ifndef ABSL_FLAGS_PARSE_H_
+#define ABSL_FLAGS_PARSE_H_
+
+#include <vector>
+
+#include "absl/base/config.h"
+#include "absl/flags/internal/parse.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+// ParseCommandLine()
+//
+// Parses the set of command-line arguments passed in the `argc` (argument
+// count) and `argv[]` (argument vector) parameters from `main()`, assigning
+// values to any defined Abseil flags. (Any arguments passed after the
+// flag-terminating delimiter (`--`) are treated as positional arguments and
+// ignored.)
+//
+// Any command-line flags (and arguments to those flags) are parsed into Abseil
+// Flag values, if those flags are defined. Any undefined flags will either
+// return an error, or be ignored if that flag is designated using `undefok` to
+// indicate "undefined is OK."
+//
+// Any command-line positional arguments not part of any command-line flag (or
+// arguments to a flag) are returned in a vector, with the program invocation
+// name at position 0 of that vector. (Note that this includes positional
+// arguments after the flag-terminating delimiter `--`.)
+//
+// After all flags and flag arguments are parsed, this function looks for any
+// built-in usage flags (e.g. `--help`), and if any were specified, it reports
+// help messages and then exits the program.
+std::vector<char*> ParseCommandLine(int argc, char* argv[]);
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_FLAGS_PARSE_H_
diff --git a/third_party/abseil/src/absl/flags/parse_test.cc b/third_party/abseil/src/absl/flags/parse_test.cc
new file mode 100644
index 0000000..41bc0bc
--- /dev/null
+++ b/third_party/abseil/src/absl/flags/parse_test.cc
@@ -0,0 +1,929 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/flags/parse.h"
+
+#include <stdlib.h>
+
+#include <fstream>
+#include <string>
+#include <vector>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/base/internal/raw_logging.h"
+#include "absl/base/internal/scoped_set_env.h"
+#include "absl/flags/declare.h"
+#include "absl/flags/flag.h"
+#include "absl/flags/internal/parse.h"
+#include "absl/flags/internal/usage.h"
+#include "absl/flags/reflection.h"
+#include "absl/strings/str_cat.h"
+#include "absl/strings/string_view.h"
+#include "absl/strings/substitute.h"
+#include "absl/types/span.h"
+
+#ifdef _WIN32
+#include <windows.h>
+#endif
+
+namespace {
+
+using absl::base_internal::ScopedSetEnv;
+
+struct UDT {
+ UDT() = default;
+ UDT(const UDT&) = default;
+ UDT(int v) : value(v) {} // NOLINT
+
+ int value;
+};
+
+bool AbslParseFlag(absl::string_view in, UDT* udt, std::string* err) {
+ if (in == "A") {
+ udt->value = 1;
+ return true;
+ }
+ if (in == "AAA") {
+ udt->value = 10;
+ return true;
+ }
+
+ *err = "Use values A, AAA instead";
+ return false;
+}
+std::string AbslUnparseFlag(const UDT& udt) {
+ return udt.value == 1 ? "A" : "AAA";
+}
+
+std::string GetTestTmpDirEnvVar(const char* const env_var_name) {
+#ifdef _WIN32
+ char buf[MAX_PATH];
+ auto get_res = GetEnvironmentVariableA(env_var_name, buf, sizeof(buf));
+ if (get_res >= sizeof(buf) || get_res == 0) {
+ return "";
+ }
+
+ return std::string(buf, get_res);
+#else
+ const char* val = ::getenv(env_var_name);
+ if (val == nullptr) {
+ return "";
+ }
+
+ return val;
+#endif
+}
+
+const std::string& GetTestTempDir() {
+ static std::string* temp_dir_name = []() -> std::string* {
+ std::string* res = new std::string(GetTestTmpDirEnvVar("TEST_TMPDIR"));
+
+ if (res->empty()) {
+ *res = GetTestTmpDirEnvVar("TMPDIR");
+ }
+
+ if (res->empty()) {
+#ifdef _WIN32
+ char temp_path_buffer[MAX_PATH];
+
+ auto len = GetTempPathA(MAX_PATH, temp_path_buffer);
+ if (len < MAX_PATH && len != 0) {
+ std::string temp_dir_name = temp_path_buffer;
+ if (!absl::EndsWith(temp_dir_name, "\\")) {
+ temp_dir_name.push_back('\\');
+ }
+ absl::StrAppend(&temp_dir_name, "parse_test.", GetCurrentProcessId());
+ if (CreateDirectoryA(temp_dir_name.c_str(), nullptr)) {
+ *res = temp_dir_name;
+ }
+ }
+#else
+ char temp_dir_template[] = "/tmp/parse_test.XXXXXX";
+ if (auto* unique_name = ::mkdtemp(temp_dir_template)) {
+ *res = unique_name;
+ }
+#endif
+ }
+
+ if (res->empty()) {
+ ABSL_INTERNAL_LOG(FATAL,
+ "Failed to make temporary directory for data files");
+ }
+
+#ifdef _WIN32
+ *res += "\\";
+#else
+ *res += "/";
+#endif
+
+ return res;
+ }();
+
+ return *temp_dir_name;
+}
+
+struct FlagfileData {
+ const absl::string_view file_name;
+ const absl::Span<const char* const> file_lines;
+};
+
+// clang-format off
+constexpr const char* const ff1_data[] = {
+ "# comment ",
+ " # comment ",
+ "",
+ " ",
+ "--int_flag=-1",
+ " --string_flag=q2w2 ",
+ " ## ",
+ " --double_flag=0.1",
+ "--bool_flag=Y "
+};
+
+constexpr const char* const ff2_data[] = {
+ "# Setting legacy flag",
+ "--legacy_int=1111",
+ "--legacy_bool",
+ "--nobool_flag",
+ "--legacy_str=aqsw",
+ "--int_flag=100",
+ " ## ============="
+};
+// clang-format on
+
+// Builds flagfile flag in the flagfile_flag buffer and returns it. This
+// function also creates a temporary flagfile based on FlagfileData input.
+// We create a flagfile in a temporary directory with the name specified in
+// FlagfileData and populate it with lines specifed in FlagfileData. If $0 is
+// referenced in any of the lines in FlagfileData they are replaced with
+// temporary directory location. This way we can test inclusion of one flagfile
+// from another flagfile.
+const char* GetFlagfileFlag(const std::vector<FlagfileData>& ffd,
+ std::string& flagfile_flag) {
+ flagfile_flag = "--flagfile=";
+ absl::string_view separator;
+ for (const auto& flagfile_data : ffd) {
+ std::string flagfile_name =
+ absl::StrCat(GetTestTempDir(), flagfile_data.file_name);
+
+ std::ofstream flagfile_out(flagfile_name);
+ for (auto line : flagfile_data.file_lines) {
+ flagfile_out << absl::Substitute(line, GetTestTempDir()) << "\n";
+ }
+
+ absl::StrAppend(&flagfile_flag, separator, flagfile_name);
+ separator = ",";
+ }
+
+ return flagfile_flag.c_str();
+}
+
+} // namespace
+
+ABSL_FLAG(int, int_flag, 1, "");
+ABSL_FLAG(double, double_flag, 1.1, "");
+ABSL_FLAG(std::string, string_flag, "a", "");
+ABSL_FLAG(bool, bool_flag, false, "");
+ABSL_FLAG(UDT, udt_flag, -1, "");
+ABSL_RETIRED_FLAG(int, legacy_int, 1, "");
+ABSL_RETIRED_FLAG(bool, legacy_bool, false, "");
+ABSL_RETIRED_FLAG(std::string, legacy_str, "l", "");
+
+namespace {
+
+namespace flags = absl::flags_internal;
+using testing::ElementsAreArray;
+
+class ParseTest : public testing::Test {
+ public:
+ ~ParseTest() override { flags::SetFlagsHelpMode(flags::HelpMode::kNone); }
+
+ private:
+ absl::FlagSaver flag_saver_;
+};
+
+// --------------------------------------------------------------------
+
+template <int N>
+std::vector<char*> InvokeParse(const char* (&in_argv)[N]) {
+ return absl::ParseCommandLine(N, const_cast<char**>(in_argv));
+}
+
+// --------------------------------------------------------------------
+
+template <int N>
+void TestParse(const char* (&in_argv)[N], int int_flag_value,
+ double double_flag_val, absl::string_view string_flag_val,
+ bool bool_flag_val, int exp_position_args = 0) {
+ auto out_args = InvokeParse(in_argv);
+
+ EXPECT_EQ(out_args.size(), 1 + exp_position_args);
+ EXPECT_STREQ(out_args[0], "testbin");
+
+ EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), int_flag_value);
+ EXPECT_NEAR(absl::GetFlag(FLAGS_double_flag), double_flag_val, 0.0001);
+ EXPECT_EQ(absl::GetFlag(FLAGS_string_flag), string_flag_val);
+ EXPECT_EQ(absl::GetFlag(FLAGS_bool_flag), bool_flag_val);
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(ParseTest, TestEmptyArgv) {
+ const char* in_argv[] = {"testbin"};
+
+ auto out_args = InvokeParse(in_argv);
+
+ EXPECT_EQ(out_args.size(), 1);
+ EXPECT_STREQ(out_args[0], "testbin");
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(ParseTest, TestValidIntArg) {
+ const char* in_args1[] = {
+ "testbin",
+ "--int_flag=10",
+ };
+ TestParse(in_args1, 10, 1.1, "a", false);
+
+ const char* in_args2[] = {
+ "testbin",
+ "-int_flag=020",
+ };
+ TestParse(in_args2, 20, 1.1, "a", false);
+
+ const char* in_args3[] = {
+ "testbin",
+ "--int_flag",
+ "-30",
+ };
+ TestParse(in_args3, -30, 1.1, "a", false);
+
+ const char* in_args4[] = {
+ "testbin",
+ "-int_flag",
+ "0x21",
+ };
+ TestParse(in_args4, 33, 1.1, "a", false);
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(ParseTest, TestValidDoubleArg) {
+ const char* in_args1[] = {
+ "testbin",
+ "--double_flag=2.3",
+ };
+ TestParse(in_args1, 1, 2.3, "a", false);
+
+ const char* in_args2[] = {
+ "testbin",
+ "--double_flag=0x1.2",
+ };
+ TestParse(in_args2, 1, 1.125, "a", false);
+
+ const char* in_args3[] = {
+ "testbin",
+ "--double_flag",
+ "99.7",
+ };
+ TestParse(in_args3, 1, 99.7, "a", false);
+
+ const char* in_args4[] = {
+ "testbin",
+ "--double_flag",
+ "0x20.1",
+ };
+ TestParse(in_args4, 1, 32.0625, "a", false);
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(ParseTest, TestValidStringArg) {
+ const char* in_args1[] = {
+ "testbin",
+ "--string_flag=aqswde",
+ };
+ TestParse(in_args1, 1, 1.1, "aqswde", false);
+
+ const char* in_args2[] = {
+ "testbin",
+ "-string_flag=a=b=c",
+ };
+ TestParse(in_args2, 1, 1.1, "a=b=c", false);
+
+ const char* in_args3[] = {
+ "testbin",
+ "--string_flag",
+ "zaxscd",
+ };
+ TestParse(in_args3, 1, 1.1, "zaxscd", false);
+
+ const char* in_args4[] = {
+ "testbin",
+ "-string_flag",
+ "--int_flag",
+ };
+ TestParse(in_args4, 1, 1.1, "--int_flag", false);
+
+ const char* in_args5[] = {
+ "testbin",
+ "--string_flag",
+ "--no_a_flag=11",
+ };
+ TestParse(in_args5, 1, 1.1, "--no_a_flag=11", false);
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(ParseTest, TestValidBoolArg) {
+ const char* in_args1[] = {
+ "testbin",
+ "--bool_flag",
+ };
+ TestParse(in_args1, 1, 1.1, "a", true);
+
+ const char* in_args2[] = {
+ "testbin",
+ "--nobool_flag",
+ };
+ TestParse(in_args2, 1, 1.1, "a", false);
+
+ const char* in_args3[] = {
+ "testbin",
+ "--bool_flag=true",
+ };
+ TestParse(in_args3, 1, 1.1, "a", true);
+
+ const char* in_args4[] = {
+ "testbin",
+ "-bool_flag=false",
+ };
+ TestParse(in_args4, 1, 1.1, "a", false);
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(ParseTest, TestValidUDTArg) {
+ const char* in_args1[] = {
+ "testbin",
+ "--udt_flag=A",
+ };
+ InvokeParse(in_args1);
+
+ EXPECT_EQ(absl::GetFlag(FLAGS_udt_flag).value, 1);
+
+ const char* in_args2[] = {"testbin", "--udt_flag", "AAA"};
+ InvokeParse(in_args2);
+
+ EXPECT_EQ(absl::GetFlag(FLAGS_udt_flag).value, 10);
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(ParseTest, TestValidMultipleArg) {
+ const char* in_args1[] = {
+ "testbin", "--bool_flag", "--int_flag=2",
+ "--double_flag=0.1", "--string_flag=asd",
+ };
+ TestParse(in_args1, 2, 0.1, "asd", true);
+
+ const char* in_args2[] = {
+ "testbin", "--string_flag=", "--nobool_flag", "--int_flag",
+ "-011", "--double_flag", "-1e-2",
+ };
+ TestParse(in_args2, -11, -0.01, "", false);
+
+ const char* in_args3[] = {
+ "testbin", "--int_flag", "-0", "--string_flag", "\"\"",
+ "--bool_flag=true", "--double_flag=1e18",
+ };
+ TestParse(in_args3, 0, 1e18, "\"\"", true);
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(ParseTest, TestPositionalArgs) {
+ const char* in_args1[] = {
+ "testbin",
+ "p1",
+ "p2",
+ };
+ TestParse(in_args1, 1, 1.1, "a", false, 2);
+
+ auto out_args1 = InvokeParse(in_args1);
+
+ EXPECT_STREQ(out_args1[1], "p1");
+ EXPECT_STREQ(out_args1[2], "p2");
+
+ const char* in_args2[] = {
+ "testbin",
+ "--int_flag=2",
+ "p1",
+ };
+ TestParse(in_args2, 2, 1.1, "a", false, 1);
+
+ auto out_args2 = InvokeParse(in_args2);
+
+ EXPECT_STREQ(out_args2[1], "p1");
+
+ const char* in_args3[] = {"testbin", "p1", "--int_flag=3",
+ "p2", "--bool_flag", "true"};
+ TestParse(in_args3, 3, 1.1, "a", true, 3);
+
+ auto out_args3 = InvokeParse(in_args3);
+
+ EXPECT_STREQ(out_args3[1], "p1");
+ EXPECT_STREQ(out_args3[2], "p2");
+ EXPECT_STREQ(out_args3[3], "true");
+
+ const char* in_args4[] = {
+ "testbin",
+ "--",
+ "p1",
+ "p2",
+ };
+ TestParse(in_args4, 3, 1.1, "a", true, 2);
+
+ auto out_args4 = InvokeParse(in_args4);
+
+ EXPECT_STREQ(out_args4[1], "p1");
+ EXPECT_STREQ(out_args4[2], "p2");
+
+ const char* in_args5[] = {
+ "testbin", "p1", "--int_flag=4", "--", "--bool_flag", "false", "p2",
+ };
+ TestParse(in_args5, 4, 1.1, "a", true, 4);
+
+ auto out_args5 = InvokeParse(in_args5);
+
+ EXPECT_STREQ(out_args5[1], "p1");
+ EXPECT_STREQ(out_args5[2], "--bool_flag");
+ EXPECT_STREQ(out_args5[3], "false");
+ EXPECT_STREQ(out_args5[4], "p2");
+}
+
+// --------------------------------------------------------------------
+
+using ParseDeathTest = ParseTest;
+
+TEST_F(ParseDeathTest, TestUndefinedArg) {
+ const char* in_args1[] = {
+ "testbin",
+ "--undefined_flag",
+ };
+ EXPECT_DEATH_IF_SUPPORTED(InvokeParse(in_args1),
+ "Unknown command line flag 'undefined_flag'");
+
+ const char* in_args2[] = {
+ "testbin",
+ "--noprefixed_flag",
+ };
+ EXPECT_DEATH_IF_SUPPORTED(InvokeParse(in_args2),
+ "Unknown command line flag 'noprefixed_flag'");
+
+ const char* in_args3[] = {
+ "testbin",
+ "--Int_flag=1",
+ };
+ EXPECT_DEATH_IF_SUPPORTED(InvokeParse(in_args3),
+ "Unknown command line flag 'Int_flag'");
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(ParseDeathTest, TestInvalidBoolFlagFormat) {
+ const char* in_args1[] = {
+ "testbin",
+ "--bool_flag=",
+ };
+ EXPECT_DEATH_IF_SUPPORTED(
+ InvokeParse(in_args1),
+ "Missing the value after assignment for the boolean flag 'bool_flag'");
+
+ const char* in_args2[] = {
+ "testbin",
+ "--nobool_flag=true",
+ };
+ EXPECT_DEATH_IF_SUPPORTED(InvokeParse(in_args2),
+ "Negative form with assignment is not valid for the boolean "
+ "flag 'bool_flag'");
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(ParseDeathTest, TestInvalidNonBoolFlagFormat) {
+ const char* in_args1[] = {
+ "testbin",
+ "--nostring_flag",
+ };
+ EXPECT_DEATH_IF_SUPPORTED(InvokeParse(in_args1),
+ "Negative form is not valid for the flag 'string_flag'");
+
+ const char* in_args2[] = {
+ "testbin",
+ "--int_flag",
+ };
+ EXPECT_DEATH_IF_SUPPORTED(InvokeParse(in_args2),
+ "Missing the value for the flag 'int_flag'");
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(ParseDeathTest, TestInvalidUDTFlagFormat) {
+ const char* in_args1[] = {
+ "testbin",
+ "--udt_flag=1",
+ };
+ EXPECT_DEATH_IF_SUPPORTED(InvokeParse(in_args1),
+ "Illegal value '1' specified for flag 'udt_flag'; Use values A, "
+ "AAA instead");
+
+ const char* in_args2[] = {
+ "testbin",
+ "--udt_flag",
+ "AA",
+ };
+ EXPECT_DEATH_IF_SUPPORTED(InvokeParse(in_args2),
+ "Illegal value 'AA' specified for flag 'udt_flag'; Use values "
+ "A, AAA instead");
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(ParseTest, TestLegacyFlags) {
+ const char* in_args1[] = {
+ "testbin",
+ "--legacy_int=11",
+ };
+ TestParse(in_args1, 1, 1.1, "a", false);
+
+ const char* in_args2[] = {
+ "testbin",
+ "--legacy_bool",
+ };
+ TestParse(in_args2, 1, 1.1, "a", false);
+
+ const char* in_args3[] = {
+ "testbin", "--legacy_int", "22", "--int_flag=2",
+ "--legacy_bool", "true", "--legacy_str", "--string_flag=qwe",
+ };
+ TestParse(in_args3, 2, 1.1, "a", false, 1);
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(ParseTest, TestSimpleValidFlagfile) {
+ std::string flagfile_flag;
+
+ const char* in_args1[] = {
+ "testbin",
+ GetFlagfileFlag({{"parse_test.ff1", absl::MakeConstSpan(ff1_data)}},
+ flagfile_flag),
+ };
+ TestParse(in_args1, -1, 0.1, "q2w2 ", true);
+
+ const char* in_args2[] = {
+ "testbin",
+ GetFlagfileFlag({{"parse_test.ff2", absl::MakeConstSpan(ff2_data)}},
+ flagfile_flag),
+ };
+ TestParse(in_args2, 100, 0.1, "q2w2 ", false);
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(ParseTest, TestValidMultiFlagfile) {
+ std::string flagfile_flag;
+
+ const char* in_args1[] = {
+ "testbin",
+ GetFlagfileFlag({{"parse_test.ff2", absl::MakeConstSpan(ff2_data)},
+ {"parse_test.ff1", absl::MakeConstSpan(ff1_data)}},
+ flagfile_flag),
+ };
+ TestParse(in_args1, -1, 0.1, "q2w2 ", true);
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(ParseTest, TestFlagfileMixedWithRegularFlags) {
+ std::string flagfile_flag;
+
+ const char* in_args1[] = {
+ "testbin", "--int_flag=3",
+ GetFlagfileFlag({{"parse_test.ff1", absl::MakeConstSpan(ff1_data)}},
+ flagfile_flag),
+ "-double_flag=0.2"};
+ TestParse(in_args1, -1, 0.2, "q2w2 ", true);
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(ParseTest, TestFlagfileInFlagfile) {
+ std::string flagfile_flag;
+
+ constexpr const char* const ff3_data[] = {
+ "--flagfile=$0/parse_test.ff1",
+ "--flagfile=$0/parse_test.ff2",
+ };
+
+ GetFlagfileFlag({{"parse_test.ff2", absl::MakeConstSpan(ff2_data)},
+ {"parse_test.ff1", absl::MakeConstSpan(ff1_data)}},
+ flagfile_flag);
+
+ const char* in_args1[] = {
+ "testbin",
+ GetFlagfileFlag({{"parse_test.ff3", absl::MakeConstSpan(ff3_data)}},
+ flagfile_flag),
+ };
+ TestParse(in_args1, 100, 0.1, "q2w2 ", false);
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(ParseDeathTest, TestInvalidFlagfiles) {
+ std::string flagfile_flag;
+
+ constexpr const char* const ff4_data[] = {
+ "--unknown_flag=10"
+ };
+
+ const char* in_args1[] = {
+ "testbin",
+ GetFlagfileFlag({{"parse_test.ff4",
+ absl::MakeConstSpan(ff4_data)}}, flagfile_flag),
+ };
+ EXPECT_DEATH_IF_SUPPORTED(InvokeParse(in_args1),
+ "Unknown command line flag 'unknown_flag'");
+
+ constexpr const char* const ff5_data[] = {
+ "--int_flag 10",
+ };
+
+ const char* in_args2[] = {
+ "testbin",
+ GetFlagfileFlag({{"parse_test.ff5",
+ absl::MakeConstSpan(ff5_data)}}, flagfile_flag),
+ };
+ EXPECT_DEATH_IF_SUPPORTED(InvokeParse(in_args2),
+ "Unknown command line flag 'int_flag 10'");
+
+ constexpr const char* const ff6_data[] = {
+ "--int_flag=10", "--", "arg1", "arg2", "arg3",
+ };
+
+ const char* in_args3[] = {
+ "testbin",
+ GetFlagfileFlag({{"parse_test.ff6", absl::MakeConstSpan(ff6_data)}},
+ flagfile_flag),
+ };
+ EXPECT_DEATH_IF_SUPPORTED(InvokeParse(in_args3),
+ "Flagfile can't contain position arguments or --");
+
+ const char* in_args4[] = {
+ "testbin",
+ "--flagfile=invalid_flag_file",
+ };
+ EXPECT_DEATH_IF_SUPPORTED(InvokeParse(in_args4),
+ "Can't open flagfile invalid_flag_file");
+
+ constexpr const char* const ff7_data[] = {
+ "--int_flag=10",
+ "*bin*",
+ "--str_flag=aqsw",
+ };
+
+ const char* in_args5[] = {
+ "testbin",
+ GetFlagfileFlag({{"parse_test.ff7", absl::MakeConstSpan(ff7_data)}},
+ flagfile_flag),
+ };
+ EXPECT_DEATH_IF_SUPPORTED(InvokeParse(in_args5),
+ "Unexpected line in the flagfile .*: \\*bin\\*");
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(ParseTest, TestReadingRequiredFlagsFromEnv) {
+ const char* in_args1[] = {"testbin",
+ "--fromenv=int_flag,bool_flag,string_flag"};
+
+ ScopedSetEnv set_int_flag("FLAGS_int_flag", "33");
+ ScopedSetEnv set_bool_flag("FLAGS_bool_flag", "True");
+ ScopedSetEnv set_string_flag("FLAGS_string_flag", "AQ12");
+
+ TestParse(in_args1, 33, 1.1, "AQ12", true);
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(ParseDeathTest, TestReadingUnsetRequiredFlagsFromEnv) {
+ const char* in_args1[] = {"testbin", "--fromenv=int_flag"};
+
+ EXPECT_DEATH_IF_SUPPORTED(InvokeParse(in_args1),
+ "FLAGS_int_flag not found in environment");
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(ParseDeathTest, TestRecursiveFlagsFromEnv) {
+ const char* in_args1[] = {"testbin", "--fromenv=tryfromenv"};
+
+ ScopedSetEnv set_tryfromenv("FLAGS_tryfromenv", "int_flag");
+
+ EXPECT_DEATH_IF_SUPPORTED(InvokeParse(in_args1),
+ "Infinite recursion on flag tryfromenv");
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(ParseTest, TestReadingOptionalFlagsFromEnv) {
+ const char* in_args1[] = {
+ "testbin", "--tryfromenv=int_flag,bool_flag,string_flag,other_flag"};
+
+ ScopedSetEnv set_int_flag("FLAGS_int_flag", "17");
+ ScopedSetEnv set_bool_flag("FLAGS_bool_flag", "Y");
+
+ TestParse(in_args1, 17, 1.1, "a", true);
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(ParseTest, TestReadingFlagsFromEnvMoxedWithRegularFlags) {
+ const char* in_args1[] = {
+ "testbin",
+ "--bool_flag=T",
+ "--tryfromenv=int_flag,bool_flag",
+ "--int_flag=-21",
+ };
+
+ ScopedSetEnv set_int_flag("FLAGS_int_flag", "-15");
+ ScopedSetEnv set_bool_flag("FLAGS_bool_flag", "F");
+
+ TestParse(in_args1, -21, 1.1, "a", false);
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(ParseTest, TestKeepParsedArgs) {
+ const char* in_args1[] = {
+ "testbin", "arg1", "--bool_flag",
+ "--int_flag=211", "arg2", "--double_flag=1.1",
+ "--string_flag", "asd", "--",
+ "arg3", "arg4",
+ };
+
+ auto out_args1 = InvokeParse(in_args1);
+
+ EXPECT_THAT(
+ out_args1,
+ ElementsAreArray({absl::string_view("testbin"), absl::string_view("arg1"),
+ absl::string_view("arg2"), absl::string_view("arg3"),
+ absl::string_view("arg4")}));
+
+ auto out_args2 = flags::ParseCommandLineImpl(
+ 11, const_cast<char**>(in_args1), flags::ArgvListAction::kKeepParsedArgs,
+ flags::UsageFlagsAction::kHandleUsage,
+ flags::OnUndefinedFlag::kAbortIfUndefined);
+
+ EXPECT_THAT(
+ out_args2,
+ ElementsAreArray({absl::string_view("testbin"),
+ absl::string_view("--bool_flag"),
+ absl::string_view("--int_flag=211"),
+ absl::string_view("--double_flag=1.1"),
+ absl::string_view("--string_flag"),
+ absl::string_view("asd"), absl::string_view("--"),
+ absl::string_view("arg1"), absl::string_view("arg2"),
+ absl::string_view("arg3"), absl::string_view("arg4")}));
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(ParseTest, TestIgnoreUndefinedFlags) {
+ const char* in_args1[] = {
+ "testbin",
+ "arg1",
+ "--undef_flag=aa",
+ "--int_flag=21",
+ };
+
+ auto out_args1 = flags::ParseCommandLineImpl(
+ 4, const_cast<char**>(in_args1), flags::ArgvListAction::kRemoveParsedArgs,
+ flags::UsageFlagsAction::kHandleUsage,
+ flags::OnUndefinedFlag::kIgnoreUndefined);
+
+ EXPECT_THAT(out_args1, ElementsAreArray({absl::string_view("testbin"),
+ absl::string_view("arg1")}));
+
+ EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), 21);
+
+ const char* in_args2[] = {
+ "testbin",
+ "arg1",
+ "--undef_flag=aa",
+ "--string_flag=AA",
+ };
+
+ auto out_args2 = flags::ParseCommandLineImpl(
+ 4, const_cast<char**>(in_args2), flags::ArgvListAction::kKeepParsedArgs,
+ flags::UsageFlagsAction::kHandleUsage,
+ flags::OnUndefinedFlag::kIgnoreUndefined);
+
+ EXPECT_THAT(
+ out_args2,
+ ElementsAreArray(
+ {absl::string_view("testbin"), absl::string_view("--undef_flag=aa"),
+ absl::string_view("--string_flag=AA"), absl::string_view("arg1")}));
+
+ EXPECT_EQ(absl::GetFlag(FLAGS_string_flag), "AA");
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(ParseDeathTest, TestSimpleHelpFlagHandling) {
+ const char* in_args1[] = {
+ "testbin",
+ "--help",
+ };
+
+ EXPECT_EXIT(InvokeParse(in_args1), testing::ExitedWithCode(1), "");
+
+ const char* in_args2[] = {
+ "testbin",
+ "--help",
+ "--int_flag=3",
+ };
+
+ auto out_args2 = flags::ParseCommandLineImpl(
+ 3, const_cast<char**>(in_args2), flags::ArgvListAction::kRemoveParsedArgs,
+ flags::UsageFlagsAction::kIgnoreUsage,
+ flags::OnUndefinedFlag::kAbortIfUndefined);
+
+ EXPECT_EQ(flags::GetFlagsHelpMode(), flags::HelpMode::kImportant);
+ EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), 3);
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(ParseDeathTest, TestSubstringHelpFlagHandling) {
+ const char* in_args1[] = {
+ "testbin",
+ "--help=abcd",
+ };
+
+ auto out_args1 = flags::ParseCommandLineImpl(
+ 2, const_cast<char**>(in_args1), flags::ArgvListAction::kRemoveParsedArgs,
+ flags::UsageFlagsAction::kIgnoreUsage,
+ flags::OnUndefinedFlag::kAbortIfUndefined);
+
+ EXPECT_EQ(flags::GetFlagsHelpMode(), flags::HelpMode::kMatch);
+ EXPECT_EQ(flags::GetFlagsHelpMatchSubstr(), "abcd");
+
+ const char* in_args2[] = {"testbin", "--help", "some_positional_arg"};
+
+ auto out_args2 = flags::ParseCommandLineImpl(
+ 3, const_cast<char**>(in_args2), flags::ArgvListAction::kRemoveParsedArgs,
+ flags::UsageFlagsAction::kIgnoreUsage,
+ flags::OnUndefinedFlag::kAbortIfUndefined);
+
+ EXPECT_EQ(flags::GetFlagsHelpMode(), flags::HelpMode::kImportant);
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(ParseTest, WasPresentOnCommandLine) {
+ const char* in_args1[] = {
+ "testbin", "arg1", "--bool_flag",
+ "--int_flag=211", "arg2", "--double_flag=1.1",
+ "--string_flag", "asd", "--",
+ "--some_flag", "arg4",
+ };
+
+ InvokeParse(in_args1);
+
+ EXPECT_TRUE(flags::WasPresentOnCommandLine("bool_flag"));
+ EXPECT_TRUE(flags::WasPresentOnCommandLine("int_flag"));
+ EXPECT_TRUE(flags::WasPresentOnCommandLine("double_flag"));
+ EXPECT_TRUE(flags::WasPresentOnCommandLine("string_flag"));
+ EXPECT_FALSE(flags::WasPresentOnCommandLine("some_flag"));
+ EXPECT_FALSE(flags::WasPresentOnCommandLine("another_flag"));
+}
+
+// --------------------------------------------------------------------
+
+} // namespace
diff --git a/third_party/abseil/src/absl/flags/reflection.cc b/third_party/abseil/src/absl/flags/reflection.cc
new file mode 100644
index 0000000..c976d46
--- /dev/null
+++ b/third_party/abseil/src/absl/flags/reflection.cc
@@ -0,0 +1,337 @@
+//
+// Copyright 2020 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/flags/reflection.h"
+
+#include <assert.h>
+
+#include <atomic>
+#include <map>
+#include <string>
+
+#include "absl/base/config.h"
+#include "absl/base/thread_annotations.h"
+#include "absl/flags/commandlineflag.h"
+#include "absl/flags/internal/private_handle_accessor.h"
+#include "absl/flags/internal/registry.h"
+#include "absl/flags/usage_config.h"
+#include "absl/strings/str_cat.h"
+#include "absl/strings/string_view.h"
+#include "absl/synchronization/mutex.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace flags_internal {
+
+// --------------------------------------------------------------------
+// FlagRegistry
+// A FlagRegistry singleton object holds all flag objects indexed by their
+// names so that if you know a flag's name, you can access or set it. If the
+// function is named FooLocked(), you must own the registry lock before
+// calling the function; otherwise, you should *not* hold the lock, and the
+// function will acquire it itself if needed.
+// --------------------------------------------------------------------
+
+class FlagRegistry {
+ public:
+ FlagRegistry() = default;
+ ~FlagRegistry() = default;
+
+ // Store a flag in this registry. Takes ownership of *flag.
+ void RegisterFlag(CommandLineFlag& flag);
+
+ void Lock() ABSL_EXCLUSIVE_LOCK_FUNCTION(lock_) { lock_.Lock(); }
+ void Unlock() ABSL_UNLOCK_FUNCTION(lock_) { lock_.Unlock(); }
+
+ // Returns the flag object for the specified name, or nullptr if not found.
+ // Will emit a warning if a 'retired' flag is specified.
+ CommandLineFlag* FindFlag(absl::string_view name);
+
+ static FlagRegistry& GlobalRegistry(); // returns a singleton registry
+
+ private:
+ friend class flags_internal::FlagSaverImpl; // reads all the flags in order
+ // to copy them
+ friend void ForEachFlag(std::function<void(CommandLineFlag&)> visitor);
+ friend void FinalizeRegistry();
+
+ // The map from name to flag, for FindFlag().
+ using FlagMap = std::map<absl::string_view, CommandLineFlag*>;
+ using FlagIterator = FlagMap::iterator;
+ using FlagConstIterator = FlagMap::const_iterator;
+ FlagMap flags_;
+ std::vector<CommandLineFlag*> flat_flags_;
+ std::atomic<bool> finalized_flags_{false};
+
+ absl::Mutex lock_;
+
+ // Disallow
+ FlagRegistry(const FlagRegistry&);
+ FlagRegistry& operator=(const FlagRegistry&);
+};
+
+namespace {
+
+class FlagRegistryLock {
+ public:
+ explicit FlagRegistryLock(FlagRegistry& fr) : fr_(fr) { fr_.Lock(); }
+ ~FlagRegistryLock() { fr_.Unlock(); }
+
+ private:
+ FlagRegistry& fr_;
+};
+
+} // namespace
+
+CommandLineFlag* FlagRegistry::FindFlag(absl::string_view name) {
+ if (finalized_flags_.load(std::memory_order_acquire)) {
+ // We could save some gcus here if we make `Name()` be non-virtual.
+ // We could move the `const char*` name to the base class.
+ auto it = std::partition_point(
+ flat_flags_.begin(), flat_flags_.end(),
+ [=](CommandLineFlag* f) { return f->Name() < name; });
+ if (it != flat_flags_.end() && (*it)->Name() == name) return *it;
+ }
+
+ FlagRegistryLock frl(*this);
+ auto it = flags_.find(name);
+ return it != flags_.end() ? it->second : nullptr;
+}
+
+void FlagRegistry::RegisterFlag(CommandLineFlag& flag) {
+ FlagRegistryLock registry_lock(*this);
+
+ std::pair<FlagIterator, bool> ins =
+ flags_.insert(FlagMap::value_type(flag.Name(), &flag));
+ if (ins.second == false) { // means the name was already in the map
+ CommandLineFlag& old_flag = *ins.first->second;
+ if (flag.IsRetired() != old_flag.IsRetired()) {
+ // All registrations must agree on the 'retired' flag.
+ flags_internal::ReportUsageError(
+ absl::StrCat(
+ "Retired flag '", flag.Name(), "' was defined normally in file '",
+ (flag.IsRetired() ? old_flag.Filename() : flag.Filename()), "'."),
+ true);
+ } else if (flags_internal::PrivateHandleAccessor::TypeId(flag) !=
+ flags_internal::PrivateHandleAccessor::TypeId(old_flag)) {
+ flags_internal::ReportUsageError(
+ absl::StrCat("Flag '", flag.Name(),
+ "' was defined more than once but with "
+ "differing types. Defined in files '",
+ old_flag.Filename(), "' and '", flag.Filename(), "'."),
+ true);
+ } else if (old_flag.IsRetired()) {
+ return;
+ } else if (old_flag.Filename() != flag.Filename()) {
+ flags_internal::ReportUsageError(
+ absl::StrCat("Flag '", flag.Name(),
+ "' was defined more than once (in files '",
+ old_flag.Filename(), "' and '", flag.Filename(), "')."),
+ true);
+ } else {
+ flags_internal::ReportUsageError(
+ absl::StrCat(
+ "Something is wrong with flag '", flag.Name(), "' in file '",
+ flag.Filename(), "'. One possibility: file '", flag.Filename(),
+ "' is being linked both statically and dynamically into this "
+ "executable. e.g. some files listed as srcs to a test and also "
+ "listed as srcs of some shared lib deps of the same test."),
+ true);
+ }
+ // All cases above are fatal, except for the retired flags.
+ std::exit(1);
+ }
+}
+
+FlagRegistry& FlagRegistry::GlobalRegistry() {
+ static FlagRegistry* global_registry = new FlagRegistry;
+ return *global_registry;
+}
+
+// --------------------------------------------------------------------
+
+void ForEachFlag(std::function<void(CommandLineFlag&)> visitor) {
+ FlagRegistry& registry = FlagRegistry::GlobalRegistry();
+
+ if (registry.finalized_flags_.load(std::memory_order_acquire)) {
+ for (const auto& i : registry.flat_flags_) visitor(*i);
+ }
+
+ FlagRegistryLock frl(registry);
+ for (const auto& i : registry.flags_) visitor(*i.second);
+}
+
+// --------------------------------------------------------------------
+
+bool RegisterCommandLineFlag(CommandLineFlag& flag) {
+ FlagRegistry::GlobalRegistry().RegisterFlag(flag);
+ return true;
+}
+
+void FinalizeRegistry() {
+ auto& registry = FlagRegistry::GlobalRegistry();
+ FlagRegistryLock frl(registry);
+ if (registry.finalized_flags_.load(std::memory_order_relaxed)) {
+ // Was already finalized. Ignore the second time.
+ return;
+ }
+ registry.flat_flags_.reserve(registry.flags_.size());
+ for (const auto& f : registry.flags_) {
+ registry.flat_flags_.push_back(f.second);
+ }
+ registry.flags_.clear();
+ registry.finalized_flags_.store(true, std::memory_order_release);
+}
+
+// --------------------------------------------------------------------
+
+namespace {
+
+class RetiredFlagObj final : public CommandLineFlag {
+ public:
+ constexpr RetiredFlagObj(const char* name, FlagFastTypeId type_id)
+ : name_(name), type_id_(type_id) {}
+
+ private:
+ absl::string_view Name() const override { return name_; }
+ std::string Filename() const override {
+ OnAccess();
+ return "RETIRED";
+ }
+ FlagFastTypeId TypeId() const override { return type_id_; }
+ std::string Help() const override {
+ OnAccess();
+ return "";
+ }
+ bool IsRetired() const override { return true; }
+ bool IsSpecifiedOnCommandLine() const override {
+ OnAccess();
+ return false;
+ }
+ std::string DefaultValue() const override {
+ OnAccess();
+ return "";
+ }
+ std::string CurrentValue() const override {
+ OnAccess();
+ return "";
+ }
+
+ // Any input is valid
+ bool ValidateInputValue(absl::string_view) const override {
+ OnAccess();
+ return true;
+ }
+
+ std::unique_ptr<flags_internal::FlagStateInterface> SaveState() override {
+ return nullptr;
+ }
+
+ bool ParseFrom(absl::string_view, flags_internal::FlagSettingMode,
+ flags_internal::ValueSource, std::string&) override {
+ OnAccess();
+ return false;
+ }
+
+ void CheckDefaultValueParsingRoundtrip() const override { OnAccess(); }
+
+ void Read(void*) const override { OnAccess(); }
+
+ void OnAccess() const {
+ flags_internal::ReportUsageError(
+ absl::StrCat("Accessing retired flag '", name_, "'"), false);
+ }
+
+ // Data members
+ const char* const name_;
+ const FlagFastTypeId type_id_;
+};
+
+} // namespace
+
+void Retire(const char* name, FlagFastTypeId type_id, char* buf) {
+ static_assert(sizeof(RetiredFlagObj) == kRetiredFlagObjSize, "");
+ static_assert(alignof(RetiredFlagObj) == kRetiredFlagObjAlignment, "");
+ auto* flag = ::new (static_cast<void*>(buf))
+ flags_internal::RetiredFlagObj(name, type_id);
+ FlagRegistry::GlobalRegistry().RegisterFlag(*flag);
+}
+
+// --------------------------------------------------------------------
+
+class FlagSaverImpl {
+ public:
+ FlagSaverImpl() = default;
+ FlagSaverImpl(const FlagSaverImpl&) = delete;
+ void operator=(const FlagSaverImpl&) = delete;
+
+ // Saves the flag states from the flag registry into this object.
+ // It's an error to call this more than once.
+ void SaveFromRegistry() {
+ assert(backup_registry_.empty()); // call only once!
+ flags_internal::ForEachFlag([&](CommandLineFlag& flag) {
+ if (auto flag_state =
+ flags_internal::PrivateHandleAccessor::SaveState(flag)) {
+ backup_registry_.emplace_back(std::move(flag_state));
+ }
+ });
+ }
+
+ // Restores the saved flag states into the flag registry.
+ void RestoreToRegistry() {
+ for (const auto& flag_state : backup_registry_) {
+ flag_state->Restore();
+ }
+ }
+
+ private:
+ std::vector<std::unique_ptr<flags_internal::FlagStateInterface>>
+ backup_registry_;
+};
+
+} // namespace flags_internal
+
+FlagSaver::FlagSaver() : impl_(new flags_internal::FlagSaverImpl) {
+ impl_->SaveFromRegistry();
+}
+
+FlagSaver::~FlagSaver() {
+ if (!impl_) return;
+
+ impl_->RestoreToRegistry();
+ delete impl_;
+}
+
+// --------------------------------------------------------------------
+
+CommandLineFlag* FindCommandLineFlag(absl::string_view name) {
+ if (name.empty()) return nullptr;
+ flags_internal::FlagRegistry& registry =
+ flags_internal::FlagRegistry::GlobalRegistry();
+ return registry.FindFlag(name);
+}
+
+// --------------------------------------------------------------------
+
+absl::flat_hash_map<absl::string_view, absl::CommandLineFlag*> GetAllFlags() {
+ absl::flat_hash_map<absl::string_view, absl::CommandLineFlag*> res;
+ flags_internal::ForEachFlag([&](CommandLineFlag& flag) {
+ if (!flag.IsRetired()) res.insert({flag.Name(), &flag});
+ });
+ return res;
+}
+
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/flags/reflection.h b/third_party/abseil/src/absl/flags/reflection.h
new file mode 100644
index 0000000..e6baf5d
--- /dev/null
+++ b/third_party/abseil/src/absl/flags/reflection.h
@@ -0,0 +1,90 @@
+//
+// Copyright 2020 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: reflection.h
+// -----------------------------------------------------------------------------
+//
+// This file defines the routines to access and operate on an Abseil Flag's
+// reflection handle.
+
+#ifndef ABSL_FLAGS_REFLECTION_H_
+#define ABSL_FLAGS_REFLECTION_H_
+
+#include <string>
+
+#include "absl/base/config.h"
+#include "absl/container/flat_hash_map.h"
+#include "absl/flags/commandlineflag.h"
+#include "absl/flags/internal/commandlineflag.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace flags_internal {
+class FlagSaverImpl;
+} // namespace flags_internal
+
+// FindCommandLineFlag()
+//
+// Returns the reflection handle of an Abseil flag of the specified name, or
+// `nullptr` if not found. This function will emit a warning if the name of a
+// 'retired' flag is specified.
+absl::CommandLineFlag* FindCommandLineFlag(absl::string_view name);
+
+// Returns current state of the Flags registry in a form of mapping from flag
+// name to a flag reflection handle.
+absl::flat_hash_map<absl::string_view, absl::CommandLineFlag*> GetAllFlags();
+
+//------------------------------------------------------------------------------
+// FlagSaver
+//------------------------------------------------------------------------------
+//
+// A FlagSaver object stores the state of flags in the scope where the FlagSaver
+// is defined, allowing modification of those flags within that scope and
+// automatic restoration of the flags to their previous state upon leaving the
+// scope.
+//
+// A FlagSaver can be used within tests to temporarily change the test
+// environment and restore the test case to its previous state.
+//
+// Example:
+//
+// void MyFunc() {
+// absl::FlagSaver fs;
+// ...
+// absl::SetFlag(&FLAGS_myFlag, otherValue);
+// ...
+// } // scope of FlagSaver left, flags return to previous state
+//
+// This class is thread-safe.
+
+class FlagSaver {
+ public:
+ FlagSaver();
+ ~FlagSaver();
+
+ FlagSaver(const FlagSaver&) = delete;
+ void operator=(const FlagSaver&) = delete;
+
+ private:
+ flags_internal::FlagSaverImpl* impl_;
+};
+
+//-----------------------------------------------------------------------------
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_FLAGS_REFLECTION_H_
diff --git a/third_party/abseil/src/absl/flags/reflection_test.cc b/third_party/abseil/src/absl/flags/reflection_test.cc
new file mode 100644
index 0000000..4c80900
--- /dev/null
+++ b/third_party/abseil/src/absl/flags/reflection_test.cc
@@ -0,0 +1,267 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/flags/reflection.h"
+
+#include <memory>
+#include <string>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/flags/declare.h"
+#include "absl/flags/flag.h"
+#include "absl/flags/internal/commandlineflag.h"
+#include "absl/flags/marshalling.h"
+#include "absl/memory/memory.h"
+#include "absl/strings/str_cat.h"
+#include "absl/strings/str_split.h"
+
+ABSL_FLAG(int, int_flag, 1, "int_flag help");
+ABSL_FLAG(std::string, string_flag, "dflt", "string_flag help");
+ABSL_RETIRED_FLAG(bool, bool_retired_flag, false, "bool_retired_flag help");
+
+namespace {
+
+namespace flags = absl::flags_internal;
+
+class ReflectionTest : public testing::Test {
+ protected:
+ void SetUp() override { flag_saver_ = absl::make_unique<absl::FlagSaver>(); }
+ void TearDown() override { flag_saver_.reset(); }
+
+ private:
+ std::unique_ptr<absl::FlagSaver> flag_saver_;
+};
+
+// --------------------------------------------------------------------
+
+TEST_F(ReflectionTest, TestFindCommandLineFlag) {
+ auto* handle = absl::FindCommandLineFlag("some_flag");
+ EXPECT_EQ(handle, nullptr);
+
+ handle = absl::FindCommandLineFlag("int_flag");
+ EXPECT_NE(handle, nullptr);
+
+ handle = absl::FindCommandLineFlag("string_flag");
+ EXPECT_NE(handle, nullptr);
+
+ handle = absl::FindCommandLineFlag("bool_retired_flag");
+ EXPECT_NE(handle, nullptr);
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(ReflectionTest, TestGetAllFlags) {
+ auto all_flags = absl::GetAllFlags();
+ EXPECT_NE(all_flags.find("int_flag"), all_flags.end());
+ EXPECT_EQ(all_flags.find("bool_retired_flag"), all_flags.end());
+ EXPECT_EQ(all_flags.find("some_undefined_flag"), all_flags.end());
+
+ std::vector<absl::string_view> flag_names_first_attempt;
+ auto all_flags_1 = absl::GetAllFlags();
+ for (auto f : all_flags_1) {
+ flag_names_first_attempt.push_back(f.first);
+ }
+
+ std::vector<absl::string_view> flag_names_second_attempt;
+ auto all_flags_2 = absl::GetAllFlags();
+ for (auto f : all_flags_2) {
+ flag_names_second_attempt.push_back(f.first);
+ }
+
+ EXPECT_THAT(flag_names_first_attempt,
+ ::testing::UnorderedElementsAreArray(flag_names_second_attempt));
+}
+
+// --------------------------------------------------------------------
+
+struct CustomUDT {
+ CustomUDT() : a(1), b(1) {}
+ CustomUDT(int a_, int b_) : a(a_), b(b_) {}
+
+ friend bool operator==(const CustomUDT& f1, const CustomUDT& f2) {
+ return f1.a == f2.a && f1.b == f2.b;
+ }
+
+ int a;
+ int b;
+};
+bool AbslParseFlag(absl::string_view in, CustomUDT* f, std::string*) {
+ std::vector<absl::string_view> parts =
+ absl::StrSplit(in, ':', absl::SkipWhitespace());
+
+ if (parts.size() != 2) return false;
+
+ if (!absl::SimpleAtoi(parts[0], &f->a)) return false;
+
+ if (!absl::SimpleAtoi(parts[1], &f->b)) return false;
+
+ return true;
+}
+std::string AbslUnparseFlag(const CustomUDT& f) {
+ return absl::StrCat(f.a, ":", f.b);
+}
+
+} // namespace
+
+// --------------------------------------------------------------------
+
+ABSL_FLAG(bool, test_flag_01, true, "");
+ABSL_FLAG(int, test_flag_02, 1234, "");
+ABSL_FLAG(int16_t, test_flag_03, -34, "");
+ABSL_FLAG(uint16_t, test_flag_04, 189, "");
+ABSL_FLAG(int32_t, test_flag_05, 10765, "");
+ABSL_FLAG(uint32_t, test_flag_06, 40000, "");
+ABSL_FLAG(int64_t, test_flag_07, -1234567, "");
+ABSL_FLAG(uint64_t, test_flag_08, 9876543, "");
+ABSL_FLAG(double, test_flag_09, -9.876e-50, "");
+ABSL_FLAG(float, test_flag_10, 1.234e12f, "");
+ABSL_FLAG(std::string, test_flag_11, "", "");
+ABSL_FLAG(absl::Duration, test_flag_12, absl::Minutes(10), "");
+static int counter = 0;
+ABSL_FLAG(int, test_flag_13, 200, "").OnUpdate([]() { counter++; });
+ABSL_FLAG(CustomUDT, test_flag_14, {}, "");
+
+namespace {
+
+TEST_F(ReflectionTest, TestFlagSaverInScope) {
+ {
+ absl::FlagSaver s;
+ counter = 0;
+ absl::SetFlag(&FLAGS_test_flag_01, false);
+ absl::SetFlag(&FLAGS_test_flag_02, -1021);
+ absl::SetFlag(&FLAGS_test_flag_03, 6009);
+ absl::SetFlag(&FLAGS_test_flag_04, 44);
+ absl::SetFlag(&FLAGS_test_flag_05, +800);
+ absl::SetFlag(&FLAGS_test_flag_06, -40978756);
+ absl::SetFlag(&FLAGS_test_flag_07, 23405);
+ absl::SetFlag(&FLAGS_test_flag_08, 975310);
+ absl::SetFlag(&FLAGS_test_flag_09, 1.00001);
+ absl::SetFlag(&FLAGS_test_flag_10, -3.54f);
+ absl::SetFlag(&FLAGS_test_flag_11, "asdf");
+ absl::SetFlag(&FLAGS_test_flag_12, absl::Hours(20));
+ absl::SetFlag(&FLAGS_test_flag_13, 4);
+ absl::SetFlag(&FLAGS_test_flag_14, CustomUDT{-1, -2});
+ }
+
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_01), true);
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_02), 1234);
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_03), -34);
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_04), 189);
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_05), 10765);
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_06), 40000);
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_07), -1234567);
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_08), 9876543);
+ EXPECT_NEAR(absl::GetFlag(FLAGS_test_flag_09), -9.876e-50, 1e-55);
+ EXPECT_NEAR(absl::GetFlag(FLAGS_test_flag_10), 1.234e12f, 1e5f);
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_11), "");
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_12), absl::Minutes(10));
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_13), 200);
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_14), CustomUDT{});
+ EXPECT_EQ(counter, 2);
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(ReflectionTest, TestFlagSaverVsUpdateViaReflection) {
+ {
+ absl::FlagSaver s;
+ counter = 0;
+ std::string error;
+ EXPECT_TRUE(
+ absl::FindCommandLineFlag("test_flag_01")->ParseFrom("false", &error))
+ << error;
+ EXPECT_TRUE(
+ absl::FindCommandLineFlag("test_flag_02")->ParseFrom("-4536", &error))
+ << error;
+ EXPECT_TRUE(
+ absl::FindCommandLineFlag("test_flag_03")->ParseFrom("111", &error))
+ << error;
+ EXPECT_TRUE(
+ absl::FindCommandLineFlag("test_flag_04")->ParseFrom("909", &error))
+ << error;
+ EXPECT_TRUE(
+ absl::FindCommandLineFlag("test_flag_05")->ParseFrom("-2004", &error))
+ << error;
+ EXPECT_TRUE(
+ absl::FindCommandLineFlag("test_flag_06")->ParseFrom("1000023", &error))
+ << error;
+ EXPECT_TRUE(
+ absl::FindCommandLineFlag("test_flag_07")->ParseFrom("69305", &error))
+ << error;
+ EXPECT_TRUE(absl::FindCommandLineFlag("test_flag_08")
+ ->ParseFrom("1000000001", &error))
+ << error;
+ EXPECT_TRUE(
+ absl::FindCommandLineFlag("test_flag_09")->ParseFrom("2.09021", &error))
+ << error;
+ EXPECT_TRUE(
+ absl::FindCommandLineFlag("test_flag_10")->ParseFrom("-33.1", &error))
+ << error;
+ EXPECT_TRUE(
+ absl::FindCommandLineFlag("test_flag_11")->ParseFrom("ADD_FOO", &error))
+ << error;
+ EXPECT_TRUE(absl::FindCommandLineFlag("test_flag_12")
+ ->ParseFrom("3h11m16s", &error))
+ << error;
+ EXPECT_TRUE(
+ absl::FindCommandLineFlag("test_flag_13")->ParseFrom("0", &error))
+ << error;
+ EXPECT_TRUE(
+ absl::FindCommandLineFlag("test_flag_14")->ParseFrom("10:1", &error))
+ << error;
+ }
+
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_01), true);
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_02), 1234);
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_03), -34);
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_04), 189);
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_05), 10765);
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_06), 40000);
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_07), -1234567);
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_08), 9876543);
+ EXPECT_NEAR(absl::GetFlag(FLAGS_test_flag_09), -9.876e-50, 1e-55);
+ EXPECT_NEAR(absl::GetFlag(FLAGS_test_flag_10), 1.234e12f, 1e5f);
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_11), "");
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_12), absl::Minutes(10));
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_13), 200);
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_14), CustomUDT{});
+ EXPECT_EQ(counter, 2);
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(ReflectionTest, TestMultipleFlagSaversInEnclosedScopes) {
+ {
+ absl::FlagSaver s;
+ absl::SetFlag(&FLAGS_test_flag_08, 10);
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_08), 10);
+ {
+ absl::FlagSaver s;
+ absl::SetFlag(&FLAGS_test_flag_08, 20);
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_08), 20);
+ {
+ absl::FlagSaver s;
+ absl::SetFlag(&FLAGS_test_flag_08, -200);
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_08), -200);
+ }
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_08), 20);
+ }
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_08), 10);
+ }
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_08), 9876543);
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/flags/usage.cc b/third_party/abseil/src/absl/flags/usage.cc
new file mode 100644
index 0000000..452f667
--- /dev/null
+++ b/third_party/abseil/src/absl/flags/usage.cc
@@ -0,0 +1,65 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+#include "absl/flags/usage.h"
+
+#include <stdlib.h>
+
+#include <string>
+
+#include "absl/base/attributes.h"
+#include "absl/base/config.h"
+#include "absl/base/const_init.h"
+#include "absl/base/thread_annotations.h"
+#include "absl/flags/internal/usage.h"
+#include "absl/strings/string_view.h"
+#include "absl/synchronization/mutex.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace flags_internal {
+namespace {
+ABSL_CONST_INIT absl::Mutex usage_message_guard(absl::kConstInit);
+ABSL_CONST_INIT std::string* program_usage_message
+ ABSL_GUARDED_BY(usage_message_guard) = nullptr;
+} // namespace
+} // namespace flags_internal
+
+// --------------------------------------------------------------------
+// Sets the "usage" message to be used by help reporting routines.
+void SetProgramUsageMessage(absl::string_view new_usage_message) {
+ absl::MutexLock l(&flags_internal::usage_message_guard);
+
+ if (flags_internal::program_usage_message != nullptr) {
+ ABSL_INTERNAL_LOG(FATAL, "SetProgramUsageMessage() called twice.");
+ std::exit(1);
+ }
+
+ flags_internal::program_usage_message = new std::string(new_usage_message);
+}
+
+// --------------------------------------------------------------------
+// Returns the usage message set by SetProgramUsageMessage().
+// Note: We able to return string_view here only because calling
+// SetProgramUsageMessage twice is prohibited.
+absl::string_view ProgramUsageMessage() {
+ absl::MutexLock l(&flags_internal::usage_message_guard);
+
+ return flags_internal::program_usage_message != nullptr
+ ? absl::string_view(*flags_internal::program_usage_message)
+ : "Warning: SetProgramUsageMessage() never called";
+}
+
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/flags/usage.h b/third_party/abseil/src/absl/flags/usage.h
new file mode 100644
index 0000000..ad12ab7
--- /dev/null
+++ b/third_party/abseil/src/absl/flags/usage.h
@@ -0,0 +1,43 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_FLAGS_USAGE_H_
+#define ABSL_FLAGS_USAGE_H_
+
+#include "absl/base/config.h"
+#include "absl/strings/string_view.h"
+
+// --------------------------------------------------------------------
+// Usage reporting interfaces
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+// Sets the "usage" message to be used by help reporting routines.
+// For example:
+// absl::SetProgramUsageMessage(
+// absl::StrCat("This program does nothing. Sample usage:\n", argv[0],
+// " <uselessarg1> <uselessarg2>"));
+// Do not include commandline flags in the usage: we do that for you!
+// Note: Calling SetProgramUsageMessage twice will trigger a call to std::exit.
+void SetProgramUsageMessage(absl::string_view new_usage_message);
+
+// Returns the usage message set by SetProgramUsageMessage().
+absl::string_view ProgramUsageMessage();
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_FLAGS_USAGE_H_
diff --git a/third_party/abseil/src/absl/flags/usage_config.cc b/third_party/abseil/src/absl/flags/usage_config.cc
new file mode 100644
index 0000000..ae2f548
--- /dev/null
+++ b/third_party/abseil/src/absl/flags/usage_config.cc
@@ -0,0 +1,164 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/flags/usage_config.h"
+
+#include <functional>
+#include <iostream>
+#include <string>
+
+#include "absl/base/attributes.h"
+#include "absl/base/config.h"
+#include "absl/base/const_init.h"
+#include "absl/base/thread_annotations.h"
+#include "absl/flags/internal/path_util.h"
+#include "absl/flags/internal/program_name.h"
+#include "absl/strings/match.h"
+#include "absl/strings/string_view.h"
+#include "absl/strings/strip.h"
+#include "absl/synchronization/mutex.h"
+
+extern "C" {
+
+// Additional report of fatal usage error message before we std::exit. Error is
+// fatal if is_fatal argument to ReportUsageError is true.
+ABSL_ATTRIBUTE_WEAK void AbslInternalReportFatalUsageError(absl::string_view) {}
+
+} // extern "C"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace flags_internal {
+
+namespace {
+
+// --------------------------------------------------------------------
+// Returns true if flags defined in the filename should be reported with
+// -helpshort flag.
+
+bool ContainsHelpshortFlags(absl::string_view filename) {
+ // By default we only want flags in binary's main. We expect the main
+ // routine to reside in <program>.cc or <program>-main.cc or
+ // <program>_main.cc, where the <program> is the name of the binary
+ // (without .exe on Windows).
+ auto suffix = flags_internal::Basename(filename);
+ auto program_name = flags_internal::ShortProgramInvocationName();
+ absl::string_view program_name_ref = program_name;
+#if defined(_WIN32)
+ absl::ConsumeSuffix(&program_name_ref, ".exe");
+#endif
+ if (!absl::ConsumePrefix(&suffix, program_name_ref))
+ return false;
+ return absl::StartsWith(suffix, ".") || absl::StartsWith(suffix, "-main.") ||
+ absl::StartsWith(suffix, "_main.");
+}
+
+// --------------------------------------------------------------------
+// Returns true if flags defined in the filename should be reported with
+// -helppackage flag.
+
+bool ContainsHelppackageFlags(absl::string_view filename) {
+ // TODO(rogeeff): implement properly when registry is available.
+ return ContainsHelpshortFlags(filename);
+}
+
+// --------------------------------------------------------------------
+// Generates program version information into supplied output.
+
+std::string VersionString() {
+ std::string version_str(flags_internal::ShortProgramInvocationName());
+
+ version_str += "\n";
+
+#if !defined(NDEBUG)
+ version_str += "Debug build (NDEBUG not #defined)\n";
+#endif
+
+ return version_str;
+}
+
+// --------------------------------------------------------------------
+// Normalizes the filename specific to the build system/filesystem used.
+
+std::string NormalizeFilename(absl::string_view filename) {
+ // Skip any leading slashes
+ auto pos = filename.find_first_not_of("\\/");
+ if (pos == absl::string_view::npos) return "";
+
+ filename.remove_prefix(pos);
+ return std::string(filename);
+}
+
+// --------------------------------------------------------------------
+
+ABSL_CONST_INIT absl::Mutex custom_usage_config_guard(absl::kConstInit);
+ABSL_CONST_INIT FlagsUsageConfig* custom_usage_config
+ ABSL_GUARDED_BY(custom_usage_config_guard) = nullptr;
+
+} // namespace
+
+FlagsUsageConfig GetUsageConfig() {
+ absl::MutexLock l(&custom_usage_config_guard);
+
+ if (custom_usage_config) return *custom_usage_config;
+
+ FlagsUsageConfig default_config;
+ default_config.contains_helpshort_flags = &ContainsHelpshortFlags;
+ default_config.contains_help_flags = &ContainsHelppackageFlags;
+ default_config.contains_helppackage_flags = &ContainsHelppackageFlags;
+ default_config.version_string = &VersionString;
+ default_config.normalize_filename = &NormalizeFilename;
+
+ return default_config;
+}
+
+void ReportUsageError(absl::string_view msg, bool is_fatal) {
+ std::cerr << "ERROR: " << msg << std::endl;
+
+ if (is_fatal) {
+ AbslInternalReportFatalUsageError(msg);
+ }
+}
+
+} // namespace flags_internal
+
+void SetFlagsUsageConfig(FlagsUsageConfig usage_config) {
+ absl::MutexLock l(&flags_internal::custom_usage_config_guard);
+
+ if (!usage_config.contains_helpshort_flags)
+ usage_config.contains_helpshort_flags =
+ flags_internal::ContainsHelpshortFlags;
+
+ if (!usage_config.contains_help_flags)
+ usage_config.contains_help_flags = flags_internal::ContainsHelppackageFlags;
+
+ if (!usage_config.contains_helppackage_flags)
+ usage_config.contains_helppackage_flags =
+ flags_internal::ContainsHelppackageFlags;
+
+ if (!usage_config.version_string)
+ usage_config.version_string = flags_internal::VersionString;
+
+ if (!usage_config.normalize_filename)
+ usage_config.normalize_filename = flags_internal::NormalizeFilename;
+
+ if (flags_internal::custom_usage_config)
+ *flags_internal::custom_usage_config = usage_config;
+ else
+ flags_internal::custom_usage_config = new FlagsUsageConfig(usage_config);
+}
+
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/flags/usage_config.h b/third_party/abseil/src/absl/flags/usage_config.h
new file mode 100644
index 0000000..96eecea
--- /dev/null
+++ b/third_party/abseil/src/absl/flags/usage_config.h
@@ -0,0 +1,134 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: usage_config.h
+// -----------------------------------------------------------------------------
+//
+// This file defines the main usage reporting configuration interfaces and
+// documents Abseil's supported built-in usage flags. If these flags are found
+// when parsing a command-line, Abseil will exit the program and display
+// appropriate help messages.
+#ifndef ABSL_FLAGS_USAGE_CONFIG_H_
+#define ABSL_FLAGS_USAGE_CONFIG_H_
+
+#include <functional>
+#include <string>
+
+#include "absl/base/config.h"
+#include "absl/strings/string_view.h"
+
+// -----------------------------------------------------------------------------
+// Built-in Usage Flags
+// -----------------------------------------------------------------------------
+//
+// Abseil supports the following built-in usage flags. When passed, these flags
+// exit the program and :
+//
+// * --help
+// Shows help on important flags for this binary
+// * --helpfull
+// Shows help on all flags
+// * --helpshort
+// Shows help on only the main module for this program
+// * --helppackage
+// Shows help on all modules in the main package
+// * --version
+// Shows the version and build info for this binary and exits
+// * --only_check_args
+// Exits after checking all flags
+// * --helpon
+// Shows help on the modules named by this flag value
+// * --helpmatch
+// Shows help on modules whose name contains the specified substring
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+namespace flags_internal {
+using FlagKindFilter = std::function<bool (absl::string_view)>;
+} // namespace flags_internal
+
+// FlagsUsageConfig
+//
+// This structure contains the collection of callbacks for changing the behavior
+// of the usage reporting routines in Abseil Flags.
+struct FlagsUsageConfig {
+ // Returns true if flags defined in the given source code file should be
+ // reported with --helpshort flag. For example, if the file
+ // "path/to/my/code.cc" defines the flag "--my_flag", and
+ // contains_helpshort_flags("path/to/my/code.cc") returns true, invoking the
+ // program with --helpshort will include information about --my_flag in the
+ // program output.
+ flags_internal::FlagKindFilter contains_helpshort_flags;
+
+ // Returns true if flags defined in the filename should be reported with
+ // --help flag. For example, if the file
+ // "path/to/my/code.cc" defines the flag "--my_flag", and
+ // contains_help_flags("path/to/my/code.cc") returns true, invoking the
+ // program with --help will include information about --my_flag in the
+ // program output.
+ flags_internal::FlagKindFilter contains_help_flags;
+
+ // Returns true if flags defined in the filename should be reported with
+ // --helppackage flag. For example, if the file
+ // "path/to/my/code.cc" defines the flag "--my_flag", and
+ // contains_helppackage_flags("path/to/my/code.cc") returns true, invoking the
+ // program with --helppackage will include information about --my_flag in the
+ // program output.
+ flags_internal::FlagKindFilter contains_helppackage_flags;
+
+ // Generates string containing program version. This is the string reported
+ // when user specifies --version in a command line.
+ std::function<std::string()> version_string;
+
+ // Normalizes the filename specific to the build system/filesystem used. This
+ // routine is used when we report the information about the flag definition
+ // location. For instance, if your build resides at some location you do not
+ // want to expose in the usage output, you can trim it to show only relevant
+ // part.
+ // For example:
+ // normalize_filename("/my_company/some_long_path/src/project/file.cc")
+ // might produce
+ // "project/file.cc".
+ std::function<std::string(absl::string_view)> normalize_filename;
+};
+
+// SetFlagsUsageConfig()
+//
+// Sets the usage reporting configuration callbacks. If any of the callbacks are
+// not set in usage_config instance, then the default value of the callback is
+// used.
+void SetFlagsUsageConfig(FlagsUsageConfig usage_config);
+
+namespace flags_internal {
+
+FlagsUsageConfig GetUsageConfig();
+
+void ReportUsageError(absl::string_view msg, bool is_fatal);
+
+} // namespace flags_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+extern "C" {
+
+// Additional report of fatal usage error message before we std::exit. Error is
+// fatal if is_fatal argument to ReportUsageError is true.
+void AbslInternalReportFatalUsageError(absl::string_view);
+
+} // extern "C"
+
+#endif // ABSL_FLAGS_USAGE_CONFIG_H_
diff --git a/third_party/abseil/src/absl/flags/usage_config_test.cc b/third_party/abseil/src/absl/flags/usage_config_test.cc
new file mode 100644
index 0000000..e57a883
--- /dev/null
+++ b/third_party/abseil/src/absl/flags/usage_config_test.cc
@@ -0,0 +1,205 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/flags/usage_config.h"
+
+#include <string>
+
+#include "gtest/gtest.h"
+#include "absl/flags/internal/path_util.h"
+#include "absl/flags/internal/program_name.h"
+#include "absl/strings/match.h"
+#include "absl/strings/string_view.h"
+
+namespace {
+
+class FlagsUsageConfigTest : public testing::Test {
+ protected:
+ void SetUp() override {
+ // Install Default config for the use on this unit test.
+ // Binary may install a custom config before tests are run.
+ absl::FlagsUsageConfig default_config;
+ absl::SetFlagsUsageConfig(default_config);
+ }
+};
+
+namespace flags = absl::flags_internal;
+
+bool TstContainsHelpshortFlags(absl::string_view f) {
+ return absl::StartsWith(flags::Basename(f), "progname.");
+}
+
+bool TstContainsHelppackageFlags(absl::string_view f) {
+ return absl::EndsWith(flags::Package(f), "aaa/");
+}
+
+bool TstContainsHelpFlags(absl::string_view f) {
+ return absl::EndsWith(flags::Package(f), "zzz/");
+}
+
+std::string TstVersionString() { return "program 1.0.0"; }
+
+std::string TstNormalizeFilename(absl::string_view filename) {
+ return std::string(filename.substr(2));
+}
+
+void TstReportUsageMessage(absl::string_view msg) {}
+
+// --------------------------------------------------------------------
+
+TEST_F(FlagsUsageConfigTest, TestGetSetFlagsUsageConfig) {
+ EXPECT_TRUE(flags::GetUsageConfig().contains_helpshort_flags);
+ EXPECT_TRUE(flags::GetUsageConfig().contains_help_flags);
+ EXPECT_TRUE(flags::GetUsageConfig().contains_helppackage_flags);
+ EXPECT_TRUE(flags::GetUsageConfig().version_string);
+ EXPECT_TRUE(flags::GetUsageConfig().normalize_filename);
+
+ absl::FlagsUsageConfig empty_config;
+ empty_config.contains_helpshort_flags = &TstContainsHelpshortFlags;
+ empty_config.contains_help_flags = &TstContainsHelpFlags;
+ empty_config.contains_helppackage_flags = &TstContainsHelppackageFlags;
+ empty_config.version_string = &TstVersionString;
+ empty_config.normalize_filename = &TstNormalizeFilename;
+ absl::SetFlagsUsageConfig(empty_config);
+
+ EXPECT_TRUE(flags::GetUsageConfig().contains_helpshort_flags);
+ EXPECT_TRUE(flags::GetUsageConfig().contains_help_flags);
+ EXPECT_TRUE(flags::GetUsageConfig().contains_helppackage_flags);
+ EXPECT_TRUE(flags::GetUsageConfig().version_string);
+ EXPECT_TRUE(flags::GetUsageConfig().normalize_filename);
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(FlagsUsageConfigTest, TestContainsHelpshortFlags) {
+#if defined(_WIN32)
+ flags::SetProgramInvocationName("usage_config_test.exe");
+#else
+ flags::SetProgramInvocationName("usage_config_test");
+#endif
+
+ auto config = flags::GetUsageConfig();
+ EXPECT_TRUE(config.contains_helpshort_flags("adir/cd/usage_config_test.cc"));
+ EXPECT_TRUE(
+ config.contains_helpshort_flags("aaaa/usage_config_test-main.cc"));
+ EXPECT_TRUE(config.contains_helpshort_flags("abc/usage_config_test_main.cc"));
+ EXPECT_FALSE(config.contains_helpshort_flags("usage_config_main.cc"));
+
+ absl::FlagsUsageConfig empty_config;
+ empty_config.contains_helpshort_flags = &TstContainsHelpshortFlags;
+ absl::SetFlagsUsageConfig(empty_config);
+
+ EXPECT_TRUE(
+ flags::GetUsageConfig().contains_helpshort_flags("aaa/progname.cpp"));
+ EXPECT_FALSE(
+ flags::GetUsageConfig().contains_helpshort_flags("aaa/progmane.cpp"));
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(FlagsUsageConfigTest, TestContainsHelpFlags) {
+ flags::SetProgramInvocationName("usage_config_test");
+
+ auto config = flags::GetUsageConfig();
+ EXPECT_TRUE(config.contains_help_flags("zzz/usage_config_test.cc"));
+ EXPECT_TRUE(
+ config.contains_help_flags("bdir/a/zzz/usage_config_test-main.cc"));
+ EXPECT_TRUE(
+ config.contains_help_flags("//aqse/zzz/usage_config_test_main.cc"));
+ EXPECT_FALSE(config.contains_help_flags("zzz/aa/usage_config_main.cc"));
+
+ absl::FlagsUsageConfig empty_config;
+ empty_config.contains_help_flags = &TstContainsHelpFlags;
+ absl::SetFlagsUsageConfig(empty_config);
+
+ EXPECT_TRUE(flags::GetUsageConfig().contains_help_flags("zzz/main-body.c"));
+ EXPECT_FALSE(
+ flags::GetUsageConfig().contains_help_flags("zzz/dir/main-body.c"));
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(FlagsUsageConfigTest, TestContainsHelppackageFlags) {
+ flags::SetProgramInvocationName("usage_config_test");
+
+ auto config = flags::GetUsageConfig();
+ EXPECT_TRUE(config.contains_helppackage_flags("aaa/usage_config_test.cc"));
+ EXPECT_TRUE(
+ config.contains_helppackage_flags("bbdir/aaa/usage_config_test-main.cc"));
+ EXPECT_TRUE(config.contains_helppackage_flags(
+ "//aqswde/aaa/usage_config_test_main.cc"));
+ EXPECT_FALSE(config.contains_helppackage_flags("aadir/usage_config_main.cc"));
+
+ absl::FlagsUsageConfig empty_config;
+ empty_config.contains_helppackage_flags = &TstContainsHelppackageFlags;
+ absl::SetFlagsUsageConfig(empty_config);
+
+ EXPECT_TRUE(
+ flags::GetUsageConfig().contains_helppackage_flags("aaa/main-body.c"));
+ EXPECT_FALSE(
+ flags::GetUsageConfig().contains_helppackage_flags("aadir/main-body.c"));
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(FlagsUsageConfigTest, TestVersionString) {
+ flags::SetProgramInvocationName("usage_config_test");
+
+#ifdef NDEBUG
+ std::string expected_output = "usage_config_test\n";
+#else
+ std::string expected_output =
+ "usage_config_test\nDebug build (NDEBUG not #defined)\n";
+#endif
+
+ EXPECT_EQ(flags::GetUsageConfig().version_string(), expected_output);
+
+ absl::FlagsUsageConfig empty_config;
+ empty_config.version_string = &TstVersionString;
+ absl::SetFlagsUsageConfig(empty_config);
+
+ EXPECT_EQ(flags::GetUsageConfig().version_string(), "program 1.0.0");
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(FlagsUsageConfigTest, TestNormalizeFilename) {
+ // This tests the default implementation.
+ EXPECT_EQ(flags::GetUsageConfig().normalize_filename("a/a.cc"), "a/a.cc");
+ EXPECT_EQ(flags::GetUsageConfig().normalize_filename("/a/a.cc"), "a/a.cc");
+ EXPECT_EQ(flags::GetUsageConfig().normalize_filename("///a/a.cc"), "a/a.cc");
+ EXPECT_EQ(flags::GetUsageConfig().normalize_filename("/"), "");
+
+ // This tests that the custom implementation is called.
+ absl::FlagsUsageConfig empty_config;
+ empty_config.normalize_filename = &TstNormalizeFilename;
+ absl::SetFlagsUsageConfig(empty_config);
+
+ EXPECT_EQ(flags::GetUsageConfig().normalize_filename("a/a.cc"), "a.cc");
+ EXPECT_EQ(flags::GetUsageConfig().normalize_filename("aaa/a.cc"), "a/a.cc");
+
+ // This tests that the default implementation is called.
+ empty_config.normalize_filename = nullptr;
+ absl::SetFlagsUsageConfig(empty_config);
+
+ EXPECT_EQ(flags::GetUsageConfig().normalize_filename("a/a.cc"), "a/a.cc");
+ EXPECT_EQ(flags::GetUsageConfig().normalize_filename("/a/a.cc"), "a/a.cc");
+ EXPECT_EQ(flags::GetUsageConfig().normalize_filename("///a/a.cc"), "a/a.cc");
+ EXPECT_EQ(flags::GetUsageConfig().normalize_filename("\\a\\a.cc"), "a\\a.cc");
+ EXPECT_EQ(flags::GetUsageConfig().normalize_filename("//"), "");
+ EXPECT_EQ(flags::GetUsageConfig().normalize_filename("\\\\"), "");
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/functional/BUILD.bazel b/third_party/abseil/src/absl/functional/BUILD.bazel
new file mode 100644
index 0000000..ebd9b99
--- /dev/null
+++ b/third_party/abseil/src/absl/functional/BUILD.bazel
@@ -0,0 +1,93 @@
+#
+# Copyright 2019 The Abseil Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+load("@rules_cc//cc:defs.bzl", "cc_library", "cc_test")
+load(
+ "//absl:copts/configure_copts.bzl",
+ "ABSL_DEFAULT_COPTS",
+ "ABSL_DEFAULT_LINKOPTS",
+ "ABSL_TEST_COPTS",
+)
+
+package(default_visibility = ["//visibility:public"])
+
+licenses(["notice"])
+
+cc_library(
+ name = "bind_front",
+ srcs = ["internal/front_binder.h"],
+ hdrs = ["bind_front.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ "//absl/base:base_internal",
+ "//absl/container:compressed_tuple",
+ "//absl/meta:type_traits",
+ "//absl/utility",
+ ],
+)
+
+cc_test(
+ name = "bind_front_test",
+ srcs = ["bind_front_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":bind_front",
+ "//absl/memory",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_library(
+ name = "function_ref",
+ srcs = ["internal/function_ref.h"],
+ hdrs = ["function_ref.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ "//absl/base:base_internal",
+ "//absl/meta:type_traits",
+ ],
+)
+
+cc_test(
+ name = "function_ref_test",
+ size = "small",
+ srcs = ["function_ref_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ deps = [
+ ":function_ref",
+ "//absl/container:test_instance_tracker",
+ "//absl/memory",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "function_ref_benchmark",
+ srcs = [
+ "function_ref_benchmark.cc",
+ ],
+ copts = ABSL_TEST_COPTS,
+ tags = ["benchmark"],
+ visibility = ["//visibility:private"],
+ deps = [
+ ":function_ref",
+ "//absl/base:core_headers",
+ "@com_github_google_benchmark//:benchmark_main",
+ ],
+)
diff --git a/third_party/abseil/src/absl/functional/CMakeLists.txt b/third_party/abseil/src/absl/functional/CMakeLists.txt
new file mode 100644
index 0000000..cda914f
--- /dev/null
+++ b/third_party/abseil/src/absl/functional/CMakeLists.txt
@@ -0,0 +1,72 @@
+#
+# Copyright 2019 The Abseil Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+absl_cc_library(
+ NAME
+ bind_front
+ SRCS
+ "internal/front_binder.h"
+ HDRS
+ "bind_front.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::base_internal
+ absl::compressed_tuple
+ PUBLIC
+)
+
+absl_cc_test(
+ NAME
+ bind_front_test
+ SRCS
+ "bind_front_test.cc"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::bind_front
+ absl::memory
+ gmock_main
+)
+
+absl_cc_library(
+ NAME
+ function_ref
+ SRCS
+ "internal/function_ref.h"
+ HDRS
+ "function_ref.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::base_internal
+ absl::meta
+ PUBLIC
+)
+
+absl_cc_test(
+ NAME
+ function_ref_test
+ SRCS
+ "function_ref_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::function_ref
+ absl::memory
+ absl::test_instance_tracker
+ gmock_main
+)
diff --git a/third_party/abseil/src/absl/functional/bind_front.h b/third_party/abseil/src/absl/functional/bind_front.h
new file mode 100644
index 0000000..5b47970
--- /dev/null
+++ b/third_party/abseil/src/absl/functional/bind_front.h
@@ -0,0 +1,184 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: bind_front.h
+// -----------------------------------------------------------------------------
+//
+// `absl::bind_front()` returns a functor by binding a number of arguments to
+// the front of a provided (usually more generic) functor. Unlike `std::bind`,
+// it does not require the use of argument placeholders. The simpler syntax of
+// `absl::bind_front()` allows you to avoid known misuses with `std::bind()`.
+//
+// `absl::bind_front()` is meant as a drop-in replacement for C++20's upcoming
+// `std::bind_front()`, which similarly resolves these issues with
+// `std::bind()`. Both `bind_front()` alternatives, unlike `std::bind()`, allow
+// partial function application. (See
+// https://en.wikipedia.org/wiki/Partial_application).
+
+#ifndef ABSL_FUNCTIONAL_BIND_FRONT_H_
+#define ABSL_FUNCTIONAL_BIND_FRONT_H_
+
+#include "absl/functional/internal/front_binder.h"
+#include "absl/utility/utility.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+// bind_front()
+//
+// Binds the first N arguments of an invocable object and stores them by value.
+//
+// Like `std::bind()`, `absl::bind_front()` is implicitly convertible to
+// `std::function`. In particular, it may be used as a simpler replacement for
+// `std::bind()` in most cases, as it does not require placeholders to be
+// specified. More importantly, it provides more reliable correctness guarantees
+// than `std::bind()`; while `std::bind()` will silently ignore passing more
+// parameters than expected, for example, `absl::bind_front()` will report such
+// mis-uses as errors.
+//
+// absl::bind_front(a...) can be seen as storing the results of
+// std::make_tuple(a...).
+//
+// Example: Binding a free function.
+//
+// int Minus(int a, int b) { return a - b; }
+//
+// assert(absl::bind_front(Minus)(3, 2) == 3 - 2);
+// assert(absl::bind_front(Minus, 3)(2) == 3 - 2);
+// assert(absl::bind_front(Minus, 3, 2)() == 3 - 2);
+//
+// Example: Binding a member function.
+//
+// struct Math {
+// int Double(int a) const { return 2 * a; }
+// };
+//
+// Math math;
+//
+// assert(absl::bind_front(&Math::Double)(&math, 3) == 2 * 3);
+// // Stores a pointer to math inside the functor.
+// assert(absl::bind_front(&Math::Double, &math)(3) == 2 * 3);
+// // Stores a copy of math inside the functor.
+// assert(absl::bind_front(&Math::Double, math)(3) == 2 * 3);
+// // Stores std::unique_ptr<Math> inside the functor.
+// assert(absl::bind_front(&Math::Double,
+// std::unique_ptr<Math>(new Math))(3) == 2 * 3);
+//
+// Example: Using `absl::bind_front()`, instead of `std::bind()`, with
+// `std::function`.
+//
+// class FileReader {
+// public:
+// void ReadFileAsync(const std::string& filename, std::string* content,
+// const std::function<void()>& done) {
+// // Calls Executor::Schedule(std::function<void()>).
+// Executor::DefaultExecutor()->Schedule(
+// absl::bind_front(&FileReader::BlockingRead, this,
+// filename, content, done));
+// }
+//
+// private:
+// void BlockingRead(const std::string& filename, std::string* content,
+// const std::function<void()>& done) {
+// CHECK_OK(file::GetContents(filename, content, {}));
+// done();
+// }
+// };
+//
+// `absl::bind_front()` stores bound arguments explicitly using the type passed
+// rather than implicitly based on the type accepted by its functor.
+//
+// Example: Binding arguments explicitly.
+//
+// void LogStringView(absl::string_view sv) {
+// LOG(INFO) << sv;
+// }
+//
+// Executor* e = Executor::DefaultExecutor();
+// std::string s = "hello";
+// absl::string_view sv = s;
+//
+// // absl::bind_front(LogStringView, arg) makes a copy of arg and stores it.
+// e->Schedule(absl::bind_front(LogStringView, sv)); // ERROR: dangling
+// // string_view.
+//
+// e->Schedule(absl::bind_front(LogStringView, s)); // OK: stores a copy of
+// // s.
+//
+// To store some of the arguments passed to `absl::bind_front()` by reference,
+// use std::ref()` and `std::cref()`.
+//
+// Example: Storing some of the bound arguments by reference.
+//
+// class Service {
+// public:
+// void Serve(const Request& req, std::function<void()>* done) {
+// // The request protocol buffer won't be deleted until done is called.
+// // It's safe to store a reference to it inside the functor.
+// Executor::DefaultExecutor()->Schedule(
+// absl::bind_front(&Service::BlockingServe, this, std::cref(req),
+// done));
+// }
+//
+// private:
+// void BlockingServe(const Request& req, std::function<void()>* done);
+// };
+//
+// Example: Storing bound arguments by reference.
+//
+// void Print(const std::string& a, const std::string& b) {
+// std::cerr << a << b;
+// }
+//
+// std::string hi = "Hello, ";
+// std::vector<std::string> names = {"Chuk", "Gek"};
+// // Doesn't copy hi.
+// for_each(names.begin(), names.end(),
+// absl::bind_front(Print, std::ref(hi)));
+//
+// // DO NOT DO THIS: the functor may outlive "hi", resulting in
+// // dangling references.
+// foo->DoInFuture(absl::bind_front(Print, std::ref(hi), "Guest")); // BAD!
+// auto f = absl::bind_front(Print, std::ref(hi), "Guest"); // BAD!
+//
+// Example: Storing reference-like types.
+//
+// void Print(absl::string_view a, const std::string& b) {
+// std::cerr << a << b;
+// }
+//
+// std::string hi = "Hello, ";
+// // Copies "hi".
+// absl::bind_front(Print, hi)("Chuk");
+//
+// // Compile error: std::reference_wrapper<const string> is not implicitly
+// // convertible to string_view.
+// // absl::bind_front(Print, std::cref(hi))("Chuk");
+//
+// // Doesn't copy "hi".
+// absl::bind_front(Print, absl::string_view(hi))("Chuk");
+//
+template <class F, class... BoundArgs>
+constexpr functional_internal::bind_front_t<F, BoundArgs...> bind_front(
+ F&& func, BoundArgs&&... args) {
+ return functional_internal::bind_front_t<F, BoundArgs...>(
+ absl::in_place, absl::forward<F>(func),
+ absl::forward<BoundArgs>(args)...);
+}
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_FUNCTIONAL_BIND_FRONT_H_
diff --git a/third_party/abseil/src/absl/functional/bind_front_test.cc b/third_party/abseil/src/absl/functional/bind_front_test.cc
new file mode 100644
index 0000000..4801a81
--- /dev/null
+++ b/third_party/abseil/src/absl/functional/bind_front_test.cc
@@ -0,0 +1,231 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/functional/bind_front.h"
+
+#include <stddef.h>
+
+#include <functional>
+#include <memory>
+#include <string>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/memory/memory.h"
+
+namespace {
+
+char CharAt(const char* s, size_t index) { return s[index]; }
+
+TEST(BindTest, Basics) {
+ EXPECT_EQ('C', absl::bind_front(CharAt)("ABC", 2));
+ EXPECT_EQ('C', absl::bind_front(CharAt, "ABC")(2));
+ EXPECT_EQ('C', absl::bind_front(CharAt, "ABC", 2)());
+}
+
+TEST(BindTest, Lambda) {
+ auto lambda = [](int x, int y, int z) { return x + y + z; };
+ EXPECT_EQ(6, absl::bind_front(lambda)(1, 2, 3));
+ EXPECT_EQ(6, absl::bind_front(lambda, 1)(2, 3));
+ EXPECT_EQ(6, absl::bind_front(lambda, 1, 2)(3));
+ EXPECT_EQ(6, absl::bind_front(lambda, 1, 2, 3)());
+}
+
+struct Functor {
+ std::string operator()() & { return "&"; }
+ std::string operator()() const& { return "const&"; }
+ std::string operator()() && { return "&&"; }
+ std::string operator()() const&& { return "const&&"; }
+};
+
+TEST(BindTest, PerfectForwardingOfBoundArgs) {
+ auto f = absl::bind_front(Functor());
+ const auto& cf = f;
+ EXPECT_EQ("&", f());
+ EXPECT_EQ("const&", cf());
+ EXPECT_EQ("&&", std::move(f)());
+ EXPECT_EQ("const&&", std::move(cf)());
+}
+
+struct ArgDescribe {
+ std::string operator()(int&) const { return "&"; } // NOLINT
+ std::string operator()(const int&) const { return "const&"; } // NOLINT
+ std::string operator()(int&&) const { return "&&"; }
+ std::string operator()(const int&&) const { return "const&&"; }
+};
+
+TEST(BindTest, PerfectForwardingOfFreeArgs) {
+ ArgDescribe f;
+ int i;
+ EXPECT_EQ("&", absl::bind_front(f)(static_cast<int&>(i)));
+ EXPECT_EQ("const&", absl::bind_front(f)(static_cast<const int&>(i)));
+ EXPECT_EQ("&&", absl::bind_front(f)(static_cast<int&&>(i)));
+ EXPECT_EQ("const&&", absl::bind_front(f)(static_cast<const int&&>(i)));
+}
+
+struct NonCopyableFunctor {
+ NonCopyableFunctor() = default;
+ NonCopyableFunctor(const NonCopyableFunctor&) = delete;
+ NonCopyableFunctor& operator=(const NonCopyableFunctor&) = delete;
+ const NonCopyableFunctor* operator()() const { return this; }
+};
+
+TEST(BindTest, RefToFunctor) {
+ // It won't copy/move the functor and use the original object.
+ NonCopyableFunctor ncf;
+ auto bound_ncf = absl::bind_front(std::ref(ncf));
+ auto bound_ncf_copy = bound_ncf;
+ EXPECT_EQ(&ncf, bound_ncf_copy());
+}
+
+struct Struct {
+ std::string value;
+};
+
+TEST(BindTest, StoreByCopy) {
+ Struct s = {"hello"};
+ auto f = absl::bind_front(&Struct::value, s);
+ auto g = f;
+ EXPECT_EQ("hello", f());
+ EXPECT_EQ("hello", g());
+ EXPECT_NE(&s.value, &f());
+ EXPECT_NE(&s.value, &g());
+ EXPECT_NE(&g(), &f());
+}
+
+struct NonCopyable {
+ explicit NonCopyable(const std::string& s) : value(s) {}
+ NonCopyable(const NonCopyable&) = delete;
+ NonCopyable& operator=(const NonCopyable&) = delete;
+
+ std::string value;
+};
+
+const std::string& GetNonCopyableValue(const NonCopyable& n) { return n.value; }
+
+TEST(BindTest, StoreByRef) {
+ NonCopyable s("hello");
+ auto f = absl::bind_front(&GetNonCopyableValue, std::ref(s));
+ EXPECT_EQ("hello", f());
+ EXPECT_EQ(&s.value, &f());
+ auto g = std::move(f); // NOLINT
+ EXPECT_EQ("hello", g());
+ EXPECT_EQ(&s.value, &g());
+ s.value = "goodbye";
+ EXPECT_EQ("goodbye", g());
+}
+
+TEST(BindTest, StoreByCRef) {
+ NonCopyable s("hello");
+ auto f = absl::bind_front(&GetNonCopyableValue, std::cref(s));
+ EXPECT_EQ("hello", f());
+ EXPECT_EQ(&s.value, &f());
+ auto g = std::move(f); // NOLINT
+ EXPECT_EQ("hello", g());
+ EXPECT_EQ(&s.value, &g());
+ s.value = "goodbye";
+ EXPECT_EQ("goodbye", g());
+}
+
+const std::string& GetNonCopyableValueByWrapper(
+ std::reference_wrapper<NonCopyable> n) {
+ return n.get().value;
+}
+
+TEST(BindTest, StoreByRefInvokeByWrapper) {
+ NonCopyable s("hello");
+ auto f = absl::bind_front(GetNonCopyableValueByWrapper, std::ref(s));
+ EXPECT_EQ("hello", f());
+ EXPECT_EQ(&s.value, &f());
+ auto g = std::move(f);
+ EXPECT_EQ("hello", g());
+ EXPECT_EQ(&s.value, &g());
+ s.value = "goodbye";
+ EXPECT_EQ("goodbye", g());
+}
+
+TEST(BindTest, StoreByPointer) {
+ NonCopyable s("hello");
+ auto f = absl::bind_front(&NonCopyable::value, &s);
+ EXPECT_EQ("hello", f());
+ EXPECT_EQ(&s.value, &f());
+ auto g = std::move(f);
+ EXPECT_EQ("hello", g());
+ EXPECT_EQ(&s.value, &g());
+}
+
+int Sink(std::unique_ptr<int> p) {
+ return *p;
+}
+
+std::unique_ptr<int> Factory(int n) { return absl::make_unique<int>(n); }
+
+TEST(BindTest, NonCopyableArg) {
+ EXPECT_EQ(42, absl::bind_front(Sink)(absl::make_unique<int>(42)));
+ EXPECT_EQ(42, absl::bind_front(Sink, absl::make_unique<int>(42))());
+}
+
+TEST(BindTest, NonCopyableResult) {
+ EXPECT_THAT(absl::bind_front(Factory)(42), ::testing::Pointee(42));
+ EXPECT_THAT(absl::bind_front(Factory, 42)(), ::testing::Pointee(42));
+}
+
+// is_copy_constructible<FalseCopyable<unique_ptr<T>> is true but an attempt to
+// instantiate the copy constructor leads to a compile error. This is similar
+// to how standard containers behave.
+template <class T>
+struct FalseCopyable {
+ FalseCopyable() {}
+ FalseCopyable(const FalseCopyable& other) : m(other.m) {}
+ FalseCopyable(FalseCopyable&& other) : m(std::move(other.m)) {}
+ T m;
+};
+
+int GetMember(FalseCopyable<std::unique_ptr<int>> x) { return *x.m; }
+
+TEST(BindTest, WrappedMoveOnly) {
+ FalseCopyable<std::unique_ptr<int>> x;
+ x.m = absl::make_unique<int>(42);
+ auto f = absl::bind_front(&GetMember, std::move(x));
+ EXPECT_EQ(42, std::move(f)());
+}
+
+int Plus(int a, int b) { return a + b; }
+
+TEST(BindTest, ConstExpr) {
+ constexpr auto f = absl::bind_front(CharAt);
+ EXPECT_EQ(f("ABC", 1), 'B');
+ static constexpr int five = 5;
+ constexpr auto plus5 = absl::bind_front(Plus, five);
+ EXPECT_EQ(plus5(1), 6);
+
+ // There seems to be a bug in MSVC dealing constexpr construction of
+ // char[]. Notice 'plus5' above; 'int' works just fine.
+#if !(defined(_MSC_VER) && _MSC_VER < 1910)
+ static constexpr char data[] = "DEF";
+ constexpr auto g = absl::bind_front(CharAt, data);
+ EXPECT_EQ(g(1), 'E');
+#endif
+}
+
+struct ManglingCall {
+ int operator()(int, double, std::string) const { return 0; }
+};
+
+TEST(BindTest, Mangling) {
+ // We just want to generate a particular instantiation to see its mangling.
+ absl::bind_front(ManglingCall{}, 1, 3.3)("A");
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/functional/function_ref.h b/third_party/abseil/src/absl/functional/function_ref.h
new file mode 100644
index 0000000..6e03ac2
--- /dev/null
+++ b/third_party/abseil/src/absl/functional/function_ref.h
@@ -0,0 +1,139 @@
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: function_ref.h
+// -----------------------------------------------------------------------------
+//
+// This header file defines the `absl::FunctionRef` type for holding a
+// non-owning reference to an object of any invocable type. This function
+// reference is typically most useful as a type-erased argument type for
+// accepting function types that neither take ownership nor copy the type; using
+// the reference type in this case avoids a copy and an allocation. Best
+// practices of other non-owning reference-like objects (such as
+// `absl::string_view`) apply here.
+//
+// An `absl::FunctionRef` is similar in usage to a `std::function` but has the
+// following differences:
+//
+// * It doesn't own the underlying object.
+// * It doesn't have a null or empty state.
+// * It never performs deep copies or allocations.
+// * It's much faster and cheaper to construct.
+// * It's trivially copyable and destructable.
+//
+// Generally, `absl::FunctionRef` should not be used as a return value, data
+// member, or to initialize a `std::function`. Such usages will often lead to
+// problematic lifetime issues. Once you convert something to an
+// `absl::FunctionRef` you cannot make a deep copy later.
+//
+// This class is suitable for use wherever a "const std::function<>&"
+// would be used without making a copy. ForEach functions and other versions of
+// the visitor pattern are a good example of when this class should be used.
+//
+// This class is trivial to copy and should be passed by value.
+#ifndef ABSL_FUNCTIONAL_FUNCTION_REF_H_
+#define ABSL_FUNCTIONAL_FUNCTION_REF_H_
+
+#include <cassert>
+#include <functional>
+#include <type_traits>
+
+#include "absl/functional/internal/function_ref.h"
+#include "absl/meta/type_traits.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+// FunctionRef
+//
+// Dummy class declaration to allow the partial specialization based on function
+// types below.
+template <typename T>
+class FunctionRef;
+
+// FunctionRef
+//
+// An `absl::FunctionRef` is a lightweight wrapper to any invokable object with
+// a compatible signature. Generally, an `absl::FunctionRef` should only be used
+// as an argument type and should be preferred as an argument over a const
+// reference to a `std::function`.
+//
+// Example:
+//
+// // The following function takes a function callback by const reference
+// bool Visitor(const std::function<void(my_proto&,
+// absl::string_view)>& callback);
+//
+// // Assuming that the function is not stored or otherwise copied, it can be
+// // replaced by an `absl::FunctionRef`:
+// bool Visitor(absl::FunctionRef<void(my_proto&, absl::string_view)>
+// callback);
+//
+// Note: the assignment operator within an `absl::FunctionRef` is intentionally
+// deleted to prevent misuse; because the `absl::FunctionRef` does not own the
+// underlying type, assignment likely indicates misuse.
+template <typename R, typename... Args>
+class FunctionRef<R(Args...)> {
+ private:
+ // Used to disable constructors for objects that are not compatible with the
+ // signature of this FunctionRef.
+ template <typename F,
+ typename FR = absl::base_internal::invoke_result_t<F, Args&&...>>
+ using EnableIfCompatible =
+ typename std::enable_if<std::is_void<R>::value ||
+ std::is_convertible<FR, R>::value>::type;
+
+ public:
+ // Constructs a FunctionRef from any invokable type.
+ template <typename F, typename = EnableIfCompatible<const F&>>
+ FunctionRef(const F& f) // NOLINT(runtime/explicit)
+ : invoker_(&absl::functional_internal::InvokeObject<F, R, Args...>) {
+ absl::functional_internal::AssertNonNull(f);
+ ptr_.obj = &f;
+ }
+
+ // Overload for function pointers. This eliminates a level of indirection that
+ // would happen if the above overload was used (it lets us store the pointer
+ // instead of a pointer to a pointer).
+ //
+ // This overload is also used for references to functions, since references to
+ // functions can decay to function pointers implicitly.
+ template <
+ typename F, typename = EnableIfCompatible<F*>,
+ absl::functional_internal::EnableIf<absl::is_function<F>::value> = 0>
+ FunctionRef(F* f) // NOLINT(runtime/explicit)
+ : invoker_(&absl::functional_internal::InvokeFunction<F*, R, Args...>) {
+ assert(f != nullptr);
+ ptr_.fun = reinterpret_cast<decltype(ptr_.fun)>(f);
+ }
+
+ // To help prevent subtle lifetime bugs, FunctionRef is not assignable.
+ // Typically, it should only be used as an argument type.
+ FunctionRef& operator=(const FunctionRef& rhs) = delete;
+
+ // Call the underlying object.
+ R operator()(Args... args) const {
+ return invoker_(ptr_, std::forward<Args>(args)...);
+ }
+
+ private:
+ absl::functional_internal::VoidPtr ptr_;
+ absl::functional_internal::Invoker<R, Args...> invoker_;
+};
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_FUNCTIONAL_FUNCTION_REF_H_
diff --git a/third_party/abseil/src/absl/functional/function_ref_benchmark.cc b/third_party/abseil/src/absl/functional/function_ref_benchmark.cc
new file mode 100644
index 0000000..045305b
--- /dev/null
+++ b/third_party/abseil/src/absl/functional/function_ref_benchmark.cc
@@ -0,0 +1,142 @@
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/functional/function_ref.h"
+
+#include <memory>
+
+#include "benchmark/benchmark.h"
+#include "absl/base/attributes.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace {
+
+int dummy = 0;
+
+void FreeFunction() { benchmark::DoNotOptimize(dummy); }
+
+struct TrivialFunctor {
+ void operator()() const { benchmark::DoNotOptimize(dummy); }
+};
+
+struct LargeFunctor {
+ void operator()() const { benchmark::DoNotOptimize(this); }
+ std::string a, b, c;
+};
+
+template <typename Function, typename... Args>
+void ABSL_ATTRIBUTE_NOINLINE CallFunction(Function f, Args&&... args) {
+ f(std::forward<Args>(args)...);
+}
+
+template <typename Function, typename Callable, typename... Args>
+void ConstructAndCallFunctionBenchmark(benchmark::State& state,
+ const Callable& c, Args&&... args) {
+ for (auto _ : state) {
+ CallFunction<Function>(c, std::forward<Args>(args)...);
+ }
+}
+
+void BM_TrivialStdFunction(benchmark::State& state) {
+ ConstructAndCallFunctionBenchmark<std::function<void()>>(state,
+ TrivialFunctor{});
+}
+BENCHMARK(BM_TrivialStdFunction);
+
+void BM_TrivialFunctionRef(benchmark::State& state) {
+ ConstructAndCallFunctionBenchmark<FunctionRef<void()>>(state,
+ TrivialFunctor{});
+}
+BENCHMARK(BM_TrivialFunctionRef);
+
+void BM_LargeStdFunction(benchmark::State& state) {
+ ConstructAndCallFunctionBenchmark<std::function<void()>>(state,
+ LargeFunctor{});
+}
+BENCHMARK(BM_LargeStdFunction);
+
+void BM_LargeFunctionRef(benchmark::State& state) {
+ ConstructAndCallFunctionBenchmark<FunctionRef<void()>>(state, LargeFunctor{});
+}
+BENCHMARK(BM_LargeFunctionRef);
+
+void BM_FunPtrStdFunction(benchmark::State& state) {
+ ConstructAndCallFunctionBenchmark<std::function<void()>>(state, FreeFunction);
+}
+BENCHMARK(BM_FunPtrStdFunction);
+
+void BM_FunPtrFunctionRef(benchmark::State& state) {
+ ConstructAndCallFunctionBenchmark<FunctionRef<void()>>(state, FreeFunction);
+}
+BENCHMARK(BM_FunPtrFunctionRef);
+
+// Doesn't include construction or copy overhead in the loop.
+template <typename Function, typename Callable, typename... Args>
+void CallFunctionBenchmark(benchmark::State& state, const Callable& c,
+ Args... args) {
+ Function f = c;
+ for (auto _ : state) {
+ benchmark::DoNotOptimize(&f);
+ f(args...);
+ }
+}
+
+struct FunctorWithTrivialArgs {
+ void operator()(int a, int b, int c) const {
+ benchmark::DoNotOptimize(a);
+ benchmark::DoNotOptimize(b);
+ benchmark::DoNotOptimize(c);
+ }
+};
+
+void BM_TrivialArgsStdFunction(benchmark::State& state) {
+ CallFunctionBenchmark<std::function<void(int, int, int)>>(
+ state, FunctorWithTrivialArgs{}, 1, 2, 3);
+}
+BENCHMARK(BM_TrivialArgsStdFunction);
+
+void BM_TrivialArgsFunctionRef(benchmark::State& state) {
+ CallFunctionBenchmark<FunctionRef<void(int, int, int)>>(
+ state, FunctorWithTrivialArgs{}, 1, 2, 3);
+}
+BENCHMARK(BM_TrivialArgsFunctionRef);
+
+struct FunctorWithNonTrivialArgs {
+ void operator()(std::string a, std::string b, std::string c) const {
+ benchmark::DoNotOptimize(&a);
+ benchmark::DoNotOptimize(&b);
+ benchmark::DoNotOptimize(&c);
+ }
+};
+
+void BM_NonTrivialArgsStdFunction(benchmark::State& state) {
+ std::string a, b, c;
+ CallFunctionBenchmark<
+ std::function<void(std::string, std::string, std::string)>>(
+ state, FunctorWithNonTrivialArgs{}, a, b, c);
+}
+BENCHMARK(BM_NonTrivialArgsStdFunction);
+
+void BM_NonTrivialArgsFunctionRef(benchmark::State& state) {
+ std::string a, b, c;
+ CallFunctionBenchmark<
+ FunctionRef<void(std::string, std::string, std::string)>>(
+ state, FunctorWithNonTrivialArgs{}, a, b, c);
+}
+BENCHMARK(BM_NonTrivialArgsFunctionRef);
+
+} // namespace
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/functional/function_ref_test.cc b/third_party/abseil/src/absl/functional/function_ref_test.cc
new file mode 100644
index 0000000..3aa5974
--- /dev/null
+++ b/third_party/abseil/src/absl/functional/function_ref_test.cc
@@ -0,0 +1,257 @@
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/functional/function_ref.h"
+
+#include <memory>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/container/internal/test_instance_tracker.h"
+#include "absl/memory/memory.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace {
+
+void RunFun(FunctionRef<void()> f) { f(); }
+
+TEST(FunctionRefTest, Lambda) {
+ bool ran = false;
+ RunFun([&] { ran = true; });
+ EXPECT_TRUE(ran);
+}
+
+int Function() { return 1337; }
+
+TEST(FunctionRefTest, Function1) {
+ FunctionRef<int()> ref(&Function);
+ EXPECT_EQ(1337, ref());
+}
+
+TEST(FunctionRefTest, Function2) {
+ FunctionRef<int()> ref(Function);
+ EXPECT_EQ(1337, ref());
+}
+
+int NoExceptFunction() noexcept { return 1337; }
+
+// TODO(jdennett): Add a test for noexcept member functions.
+TEST(FunctionRefTest, NoExceptFunction) {
+ FunctionRef<int()> ref(NoExceptFunction);
+ EXPECT_EQ(1337, ref());
+}
+
+TEST(FunctionRefTest, ForwardsArgs) {
+ auto l = [](std::unique_ptr<int> i) { return *i; };
+ FunctionRef<int(std::unique_ptr<int>)> ref(l);
+ EXPECT_EQ(42, ref(absl::make_unique<int>(42)));
+}
+
+TEST(FunctionRef, ReturnMoveOnly) {
+ auto l = [] { return absl::make_unique<int>(29); };
+ FunctionRef<std::unique_ptr<int>()> ref(l);
+ EXPECT_EQ(29, *ref());
+}
+
+TEST(FunctionRef, ManyArgs) {
+ auto l = [](int a, int b, int c) { return a + b + c; };
+ FunctionRef<int(int, int, int)> ref(l);
+ EXPECT_EQ(6, ref(1, 2, 3));
+}
+
+TEST(FunctionRef, VoidResultFromNonVoidFunctor) {
+ bool ran = false;
+ auto l = [&]() -> int {
+ ran = true;
+ return 2;
+ };
+ FunctionRef<void()> ref(l);
+ ref();
+ EXPECT_TRUE(ran);
+}
+
+TEST(FunctionRef, CastFromDerived) {
+ struct Base {};
+ struct Derived : public Base {};
+
+ Derived d;
+ auto l1 = [&](Base* b) { EXPECT_EQ(&d, b); };
+ FunctionRef<void(Derived*)> ref1(l1);
+ ref1(&d);
+
+ auto l2 = [&]() -> Derived* { return &d; };
+ FunctionRef<Base*()> ref2(l2);
+ EXPECT_EQ(&d, ref2());
+}
+
+TEST(FunctionRef, VoidResultFromNonVoidFuncton) {
+ FunctionRef<void()> ref(Function);
+ ref();
+}
+
+TEST(FunctionRef, MemberPtr) {
+ struct S {
+ int i;
+ };
+
+ S s{1100111};
+ auto mem_ptr = &S::i;
+ FunctionRef<int(const S& s)> ref(mem_ptr);
+ EXPECT_EQ(1100111, ref(s));
+}
+
+TEST(FunctionRef, MemberFun) {
+ struct S {
+ int i;
+ int get_i() const { return i; }
+ };
+
+ S s{22};
+ auto mem_fun_ptr = &S::get_i;
+ FunctionRef<int(const S& s)> ref(mem_fun_ptr);
+ EXPECT_EQ(22, ref(s));
+}
+
+TEST(FunctionRef, MemberFunRefqualified) {
+ struct S {
+ int i;
+ int get_i() && { return i; }
+ };
+ auto mem_fun_ptr = &S::get_i;
+ S s{22};
+ FunctionRef<int(S && s)> ref(mem_fun_ptr);
+ EXPECT_EQ(22, ref(std::move(s)));
+}
+
+#if !defined(_WIN32) && defined(GTEST_HAS_DEATH_TEST)
+
+TEST(FunctionRef, MemberFunRefqualifiedNull) {
+ struct S {
+ int i;
+ int get_i() && { return i; }
+ };
+ auto mem_fun_ptr = &S::get_i;
+ mem_fun_ptr = nullptr;
+ EXPECT_DEBUG_DEATH({ FunctionRef<int(S && s)> ref(mem_fun_ptr); }, "");
+}
+
+TEST(FunctionRef, NullMemberPtrAssertFails) {
+ struct S {
+ int i;
+ };
+ using MemberPtr = int S::*;
+ MemberPtr mem_ptr = nullptr;
+ EXPECT_DEBUG_DEATH({ FunctionRef<int(const S& s)> ref(mem_ptr); }, "");
+}
+
+#endif // GTEST_HAS_DEATH_TEST
+
+TEST(FunctionRef, CopiesAndMovesPerPassByValue) {
+ absl::test_internal::InstanceTracker tracker;
+ absl::test_internal::CopyableMovableInstance instance(0);
+ auto l = [](absl::test_internal::CopyableMovableInstance) {};
+ FunctionRef<void(absl::test_internal::CopyableMovableInstance)> ref(l);
+ ref(instance);
+ EXPECT_EQ(tracker.copies(), 1);
+ EXPECT_EQ(tracker.moves(), 1);
+}
+
+TEST(FunctionRef, CopiesAndMovesPerPassByRef) {
+ absl::test_internal::InstanceTracker tracker;
+ absl::test_internal::CopyableMovableInstance instance(0);
+ auto l = [](const absl::test_internal::CopyableMovableInstance&) {};
+ FunctionRef<void(const absl::test_internal::CopyableMovableInstance&)> ref(l);
+ ref(instance);
+ EXPECT_EQ(tracker.copies(), 0);
+ EXPECT_EQ(tracker.moves(), 0);
+}
+
+TEST(FunctionRef, CopiesAndMovesPerPassByValueCallByMove) {
+ absl::test_internal::InstanceTracker tracker;
+ absl::test_internal::CopyableMovableInstance instance(0);
+ auto l = [](absl::test_internal::CopyableMovableInstance) {};
+ FunctionRef<void(absl::test_internal::CopyableMovableInstance)> ref(l);
+ ref(std::move(instance));
+ EXPECT_EQ(tracker.copies(), 0);
+ EXPECT_EQ(tracker.moves(), 2);
+}
+
+TEST(FunctionRef, CopiesAndMovesPerPassByValueToRef) {
+ absl::test_internal::InstanceTracker tracker;
+ absl::test_internal::CopyableMovableInstance instance(0);
+ auto l = [](const absl::test_internal::CopyableMovableInstance&) {};
+ FunctionRef<void(absl::test_internal::CopyableMovableInstance)> ref(l);
+ ref(std::move(instance));
+ EXPECT_EQ(tracker.copies(), 0);
+ EXPECT_EQ(tracker.moves(), 1);
+}
+
+TEST(FunctionRef, PassByValueTypes) {
+ using absl::functional_internal::Invoker;
+ using absl::functional_internal::VoidPtr;
+ using absl::test_internal::CopyableMovableInstance;
+ struct Trivial {
+ void* p[2];
+ };
+ struct LargeTrivial {
+ void* p[3];
+ };
+
+ static_assert(std::is_same<Invoker<void, int>, void (*)(VoidPtr, int)>::value,
+ "Scalar types should be passed by value");
+ static_assert(
+ std::is_same<Invoker<void, Trivial>, void (*)(VoidPtr, Trivial)>::value,
+ "Small trivial types should be passed by value");
+ static_assert(std::is_same<Invoker<void, LargeTrivial>,
+ void (*)(VoidPtr, LargeTrivial &&)>::value,
+ "Large trivial types should be passed by rvalue reference");
+ static_assert(
+ std::is_same<Invoker<void, CopyableMovableInstance>,
+ void (*)(VoidPtr, CopyableMovableInstance &&)>::value,
+ "Types with copy/move ctor should be passed by rvalue reference");
+
+ // References are passed as references.
+ static_assert(
+ std::is_same<Invoker<void, int&>, void (*)(VoidPtr, int&)>::value,
+ "Reference types should be preserved");
+ static_assert(
+ std::is_same<Invoker<void, CopyableMovableInstance&>,
+ void (*)(VoidPtr, CopyableMovableInstance&)>::value,
+ "Reference types should be preserved");
+ static_assert(
+ std::is_same<Invoker<void, CopyableMovableInstance&&>,
+ void (*)(VoidPtr, CopyableMovableInstance &&)>::value,
+ "Reference types should be preserved");
+
+ // Make sure the address of an object received by reference is the same as the
+ // addess of the object passed by the caller.
+ {
+ LargeTrivial obj;
+ auto test = [&obj](LargeTrivial& input) { ASSERT_EQ(&input, &obj); };
+ absl::FunctionRef<void(LargeTrivial&)> ref(test);
+ ref(obj);
+ }
+
+ {
+ Trivial obj;
+ auto test = [&obj](Trivial& input) { ASSERT_EQ(&input, &obj); };
+ absl::FunctionRef<void(Trivial&)> ref(test);
+ ref(obj);
+ }
+}
+
+} // namespace
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/functional/internal/front_binder.h b/third_party/abseil/src/absl/functional/internal/front_binder.h
new file mode 100644
index 0000000..45f52de
--- /dev/null
+++ b/third_party/abseil/src/absl/functional/internal/front_binder.h
@@ -0,0 +1,95 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Implementation details for `absl::bind_front()`.
+
+#ifndef ABSL_FUNCTIONAL_INTERNAL_FRONT_BINDER_H_
+#define ABSL_FUNCTIONAL_INTERNAL_FRONT_BINDER_H_
+
+#include <cstddef>
+#include <type_traits>
+#include <utility>
+
+#include "absl/base/internal/invoke.h"
+#include "absl/container/internal/compressed_tuple.h"
+#include "absl/meta/type_traits.h"
+#include "absl/utility/utility.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace functional_internal {
+
+// Invoke the method, expanding the tuple of bound arguments.
+template <class R, class Tuple, size_t... Idx, class... Args>
+R Apply(Tuple&& bound, absl::index_sequence<Idx...>, Args&&... free) {
+ return base_internal::invoke(
+ absl::forward<Tuple>(bound).template get<Idx>()...,
+ absl::forward<Args>(free)...);
+}
+
+template <class F, class... BoundArgs>
+class FrontBinder {
+ using BoundArgsT = absl::container_internal::CompressedTuple<F, BoundArgs...>;
+ using Idx = absl::make_index_sequence<sizeof...(BoundArgs) + 1>;
+
+ BoundArgsT bound_args_;
+
+ public:
+ template <class... Ts>
+ constexpr explicit FrontBinder(absl::in_place_t, Ts&&... ts)
+ : bound_args_(absl::forward<Ts>(ts)...) {}
+
+ template <class... FreeArgs, class R = base_internal::invoke_result_t<
+ F&, BoundArgs&..., FreeArgs&&...>>
+ R operator()(FreeArgs&&... free_args) & {
+ return functional_internal::Apply<R>(bound_args_, Idx(),
+ absl::forward<FreeArgs>(free_args)...);
+ }
+
+ template <class... FreeArgs,
+ class R = base_internal::invoke_result_t<
+ const F&, const BoundArgs&..., FreeArgs&&...>>
+ R operator()(FreeArgs&&... free_args) const& {
+ return functional_internal::Apply<R>(bound_args_, Idx(),
+ absl::forward<FreeArgs>(free_args)...);
+ }
+
+ template <class... FreeArgs, class R = base_internal::invoke_result_t<
+ F&&, BoundArgs&&..., FreeArgs&&...>>
+ R operator()(FreeArgs&&... free_args) && {
+ // This overload is called when *this is an rvalue. If some of the bound
+ // arguments are stored by value or rvalue reference, we move them.
+ return functional_internal::Apply<R>(absl::move(bound_args_), Idx(),
+ absl::forward<FreeArgs>(free_args)...);
+ }
+
+ template <class... FreeArgs,
+ class R = base_internal::invoke_result_t<
+ const F&&, const BoundArgs&&..., FreeArgs&&...>>
+ R operator()(FreeArgs&&... free_args) const&& {
+ // This overload is called when *this is an rvalue. If some of the bound
+ // arguments are stored by value or rvalue reference, we move them.
+ return functional_internal::Apply<R>(absl::move(bound_args_), Idx(),
+ absl::forward<FreeArgs>(free_args)...);
+ }
+};
+
+template <class F, class... BoundArgs>
+using bind_front_t = FrontBinder<decay_t<F>, absl::decay_t<BoundArgs>...>;
+
+} // namespace functional_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_FUNCTIONAL_INTERNAL_FRONT_BINDER_H_
diff --git a/third_party/abseil/src/absl/functional/internal/function_ref.h b/third_party/abseil/src/absl/functional/internal/function_ref.h
new file mode 100644
index 0000000..b5bb8b4
--- /dev/null
+++ b/third_party/abseil/src/absl/functional/internal/function_ref.h
@@ -0,0 +1,106 @@
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_FUNCTIONAL_INTERNAL_FUNCTION_REF_H_
+#define ABSL_FUNCTIONAL_INTERNAL_FUNCTION_REF_H_
+
+#include <cassert>
+#include <functional>
+#include <type_traits>
+
+#include "absl/base/internal/invoke.h"
+#include "absl/meta/type_traits.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace functional_internal {
+
+// Like a void* that can handle function pointers as well. The standard does not
+// allow function pointers to round-trip through void*, but void(*)() is fine.
+//
+// Note: It's important that this class remains trivial and is the same size as
+// a pointer, since this allows the compiler to perform tail-call optimizations
+// when the underlying function is a callable object with a matching signature.
+union VoidPtr {
+ const void* obj;
+ void (*fun)();
+};
+
+// Chooses the best type for passing T as an argument.
+// Attempt to be close to SystemV AMD64 ABI. Objects with trivial copy ctor are
+// passed by value.
+template <typename T>
+constexpr bool PassByValue() {
+ return !std::is_lvalue_reference<T>::value &&
+ absl::is_trivially_copy_constructible<T>::value &&
+ absl::is_trivially_copy_assignable<
+ typename std::remove_cv<T>::type>::value &&
+ std::is_trivially_destructible<T>::value &&
+ sizeof(T) <= 2 * sizeof(void*);
+}
+
+template <typename T>
+struct ForwardT : std::conditional<PassByValue<T>(), T, T&&> {};
+
+// An Invoker takes a pointer to the type-erased invokable object, followed by
+// the arguments that the invokable object expects.
+//
+// Note: The order of arguments here is an optimization, since member functions
+// have an implicit "this" pointer as their first argument, putting VoidPtr
+// first allows the compiler to perform tail-call optimization in many cases.
+template <typename R, typename... Args>
+using Invoker = R (*)(VoidPtr, typename ForwardT<Args>::type...);
+
+//
+// InvokeObject and InvokeFunction provide static "Invoke" functions that can be
+// used as Invokers for objects or functions respectively.
+//
+// static_cast<R> handles the case the return type is void.
+template <typename Obj, typename R, typename... Args>
+R InvokeObject(VoidPtr ptr, typename ForwardT<Args>::type... args) {
+ auto o = static_cast<const Obj*>(ptr.obj);
+ return static_cast<R>(
+ absl::base_internal::invoke(*o, std::forward<Args>(args)...));
+}
+
+template <typename Fun, typename R, typename... Args>
+R InvokeFunction(VoidPtr ptr, typename ForwardT<Args>::type... args) {
+ auto f = reinterpret_cast<Fun>(ptr.fun);
+ return static_cast<R>(
+ absl::base_internal::invoke(f, std::forward<Args>(args)...));
+}
+
+template <typename Sig>
+void AssertNonNull(const std::function<Sig>& f) {
+ assert(f != nullptr);
+ (void)f;
+}
+
+template <typename F>
+void AssertNonNull(const F&) {}
+
+template <typename F, typename C>
+void AssertNonNull(F C::*f) {
+ assert(f != nullptr);
+ (void)f;
+}
+
+template <bool C>
+using EnableIf = typename ::std::enable_if<C, int>::type;
+
+} // namespace functional_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_FUNCTIONAL_INTERNAL_FUNCTION_REF_H_
diff --git a/third_party/abseil/src/absl/hash/BUILD.bazel b/third_party/abseil/src/absl/hash/BUILD.bazel
new file mode 100644
index 0000000..5b1e2d0
--- /dev/null
+++ b/third_party/abseil/src/absl/hash/BUILD.bazel
@@ -0,0 +1,122 @@
+#
+# Copyright 2019 The Abseil Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+load("@rules_cc//cc:defs.bzl", "cc_library", "cc_test")
+load(
+ "//absl:copts/configure_copts.bzl",
+ "ABSL_DEFAULT_COPTS",
+ "ABSL_DEFAULT_LINKOPTS",
+ "ABSL_TEST_COPTS",
+)
+
+package(default_visibility = ["//visibility:public"])
+
+licenses(["notice"])
+
+cc_library(
+ name = "hash",
+ srcs = [
+ "internal/hash.cc",
+ "internal/hash.h",
+ ],
+ hdrs = ["hash.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":city",
+ "//absl/base:core_headers",
+ "//absl/base:endian",
+ "//absl/container:fixed_array",
+ "//absl/meta:type_traits",
+ "//absl/numeric:int128",
+ "//absl/strings",
+ "//absl/types:optional",
+ "//absl/types:variant",
+ "//absl/utility",
+ ],
+)
+
+cc_library(
+ name = "hash_testing",
+ testonly = 1,
+ hdrs = ["hash_testing.h"],
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":spy_hash_state",
+ "//absl/meta:type_traits",
+ "//absl/strings",
+ "//absl/types:variant",
+ "@com_google_googletest//:gtest",
+ ],
+)
+
+cc_test(
+ name = "hash_test",
+ srcs = ["hash_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":hash",
+ ":hash_testing",
+ ":spy_hash_state",
+ "//absl/base:core_headers",
+ "//absl/container:flat_hash_set",
+ "//absl/meta:type_traits",
+ "//absl/numeric:int128",
+ "//absl/strings:cord_test_helpers",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_library(
+ name = "spy_hash_state",
+ testonly = 1,
+ hdrs = ["internal/spy_hash_state.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ visibility = ["//visibility:private"],
+ deps = [
+ ":hash",
+ "//absl/strings",
+ "//absl/strings:str_format",
+ ],
+)
+
+cc_library(
+ name = "city",
+ srcs = ["internal/city.cc"],
+ hdrs = [
+ "internal/city.h",
+ ],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ "//absl/base:config",
+ "//absl/base:core_headers",
+ "//absl/base:endian",
+ ],
+)
+
+cc_test(
+ name = "city_test",
+ srcs = ["internal/city_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":city",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
diff --git a/third_party/abseil/src/absl/hash/CMakeLists.txt b/third_party/abseil/src/absl/hash/CMakeLists.txt
new file mode 100644
index 0000000..61365e9
--- /dev/null
+++ b/third_party/abseil/src/absl/hash/CMakeLists.txt
@@ -0,0 +1,116 @@
+#
+# Copyright 2018 The Abseil Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+absl_cc_library(
+ NAME
+ hash
+ HDRS
+ "hash.h"
+ SRCS
+ "internal/hash.cc"
+ "internal/hash.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::core_headers
+ absl::endian
+ absl::fixed_array
+ absl::meta
+ absl::int128
+ absl::strings
+ absl::optional
+ absl::variant
+ absl::utility
+ absl::city
+ PUBLIC
+)
+
+absl_cc_library(
+ NAME
+ hash_testing
+ HDRS
+ "hash_testing.h"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::spy_hash_state
+ absl::meta
+ absl::strings
+ absl::variant
+ gmock
+ TESTONLY
+)
+
+absl_cc_test(
+ NAME
+ hash_test
+ SRCS
+ "hash_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::cord_test_helpers
+ absl::hash
+ absl::hash_testing
+ absl::core_headers
+ absl::flat_hash_set
+ absl::spy_hash_state
+ absl::meta
+ absl::int128
+ gmock_main
+)
+
+absl_cc_library(
+ NAME
+ spy_hash_state
+ HDRS
+ "internal/spy_hash_state.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::hash
+ absl::strings
+ absl::str_format
+ TESTONLY
+)
+
+absl_cc_library(
+ NAME
+ city
+ HDRS
+ "internal/city.h"
+ SRCS
+ "internal/city.cc"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::config
+ absl::core_headers
+ absl::endian
+)
+
+absl_cc_test(
+ NAME
+ city_test
+ SRCS
+ "internal/city_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::city
+ gmock_main
+)
+
diff --git a/third_party/abseil/src/absl/hash/hash.h b/third_party/abseil/src/absl/hash/hash.h
new file mode 100644
index 0000000..5de132c
--- /dev/null
+++ b/third_party/abseil/src/absl/hash/hash.h
@@ -0,0 +1,325 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: hash.h
+// -----------------------------------------------------------------------------
+//
+// This header file defines the Abseil `hash` library and the Abseil hashing
+// framework. This framework consists of the following:
+//
+// * The `absl::Hash` functor, which is used to invoke the hasher within the
+// Abseil hashing framework. `absl::Hash<T>` supports most basic types and
+// a number of Abseil types out of the box.
+// * `AbslHashValue`, an extension point that allows you to extend types to
+// support Abseil hashing without requiring you to define a hashing
+// algorithm.
+// * `HashState`, a type-erased class which implements the manipulation of the
+// hash state (H) itself, contains member functions `combine()` and
+// `combine_contiguous()`, which you can use to contribute to an existing
+// hash state when hashing your types.
+//
+// Unlike `std::hash` or other hashing frameworks, the Abseil hashing framework
+// provides most of its utility by abstracting away the hash algorithm (and its
+// implementation) entirely. Instead, a type invokes the Abseil hashing
+// framework by simply combining its state with the state of known, hashable
+// types. Hashing of that combined state is separately done by `absl::Hash`.
+//
+// One should assume that a hash algorithm is chosen randomly at the start of
+// each process. E.g., `absl::Hash<int>{}(9)` in one process and
+// `absl::Hash<int>{}(9)` in another process are likely to differ.
+//
+// `absl::Hash` is intended to strongly mix input bits with a target of passing
+// an [Avalanche Test](https://en.wikipedia.org/wiki/Avalanche_effect).
+//
+// Example:
+//
+// // Suppose we have a class `Circle` for which we want to add hashing:
+// class Circle {
+// public:
+// ...
+// private:
+// std::pair<int, int> center_;
+// int radius_;
+// };
+//
+// // To add hashing support to `Circle`, we simply need to add a free
+// // (non-member) function `AbslHashValue()`, and return the combined hash
+// // state of the existing hash state and the class state. You can add such a
+// // free function using a friend declaration within the body of the class:
+// class Circle {
+// public:
+// ...
+// template <typename H>
+// friend H AbslHashValue(H h, const Circle& c) {
+// return H::combine(std::move(h), c.center_, c.radius_);
+// }
+// ...
+// };
+//
+// For more information, see Adding Type Support to `absl::Hash` below.
+//
+#ifndef ABSL_HASH_HASH_H_
+#define ABSL_HASH_HASH_H_
+
+#include "absl/hash/internal/hash.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+// -----------------------------------------------------------------------------
+// `absl::Hash`
+// -----------------------------------------------------------------------------
+//
+// `absl::Hash<T>` is a convenient general-purpose hash functor for any type `T`
+// satisfying any of the following conditions (in order):
+//
+// * T is an arithmetic or pointer type
+// * T defines an overload for `AbslHashValue(H, const T&)` for an arbitrary
+// hash state `H`.
+// - T defines a specialization of `std::hash<T>`
+//
+// `absl::Hash` intrinsically supports the following types:
+//
+// * All integral types (including bool)
+// * All enum types
+// * All floating-point types (although hashing them is discouraged)
+// * All pointer types, including nullptr_t
+// * std::pair<T1, T2>, if T1 and T2 are hashable
+// * std::tuple<Ts...>, if all the Ts... are hashable
+// * std::unique_ptr and std::shared_ptr
+// * All string-like types including:
+// * absl::Cord
+// * std::string
+// * std::string_view (as well as any instance of std::basic_string that
+// uses char and std::char_traits)
+// * All the standard sequence containers (provided the elements are hashable)
+// * All the standard ordered associative containers (provided the elements are
+// hashable)
+// * absl types such as the following:
+// * absl::string_view
+// * absl::InlinedVector
+// * absl::FixedArray
+// * absl::uint128
+// * absl::Time, absl::Duration, and absl::TimeZone
+//
+// Note: the list above is not meant to be exhaustive. Additional type support
+// may be added, in which case the above list will be updated.
+//
+// -----------------------------------------------------------------------------
+// absl::Hash Invocation Evaluation
+// -----------------------------------------------------------------------------
+//
+// When invoked, `absl::Hash<T>` searches for supplied hash functions in the
+// following order:
+//
+// * Natively supported types out of the box (see above)
+// * Types for which an `AbslHashValue()` overload is provided (such as
+// user-defined types). See "Adding Type Support to `absl::Hash`" below.
+// * Types which define a `std::hash<T>` specialization
+//
+// The fallback to legacy hash functions exists mainly for backwards
+// compatibility. If you have a choice, prefer defining an `AbslHashValue`
+// overload instead of specializing any legacy hash functors.
+//
+// -----------------------------------------------------------------------------
+// The Hash State Concept, and using `HashState` for Type Erasure
+// -----------------------------------------------------------------------------
+//
+// The `absl::Hash` framework relies on the Concept of a "hash state." Such a
+// hash state is used in several places:
+//
+// * Within existing implementations of `absl::Hash<T>` to store the hashed
+// state of an object. Note that it is up to the implementation how it stores
+// such state. A hash table, for example, may mix the state to produce an
+// integer value; a testing framework may simply hold a vector of that state.
+// * Within implementations of `AbslHashValue()` used to extend user-defined
+// types. (See "Adding Type Support to absl::Hash" below.)
+// * Inside a `HashState`, providing type erasure for the concept of a hash
+// state, which you can use to extend the `absl::Hash` framework for types
+// that are otherwise difficult to extend using `AbslHashValue()`. (See the
+// `HashState` class below.)
+//
+// The "hash state" concept contains two member functions for mixing hash state:
+//
+// * `H::combine(state, values...)`
+//
+// Combines an arbitrary number of values into a hash state, returning the
+// updated state. Note that the existing hash state is move-only and must be
+// passed by value.
+//
+// Each of the value types T must be hashable by H.
+//
+// NOTE:
+//
+// state = H::combine(std::move(state), value1, value2, value3);
+//
+// must be guaranteed to produce the same hash expansion as
+//
+// state = H::combine(std::move(state), value1);
+// state = H::combine(std::move(state), value2);
+// state = H::combine(std::move(state), value3);
+//
+// * `H::combine_contiguous(state, data, size)`
+//
+// Combines a contiguous array of `size` elements into a hash state,
+// returning the updated state. Note that the existing hash state is
+// move-only and must be passed by value.
+//
+// NOTE:
+//
+// state = H::combine_contiguous(std::move(state), data, size);
+//
+// need NOT be guaranteed to produce the same hash expansion as a loop
+// (it may perform internal optimizations). If you need this guarantee, use a
+// loop instead.
+//
+// -----------------------------------------------------------------------------
+// Adding Type Support to `absl::Hash`
+// -----------------------------------------------------------------------------
+//
+// To add support for your user-defined type, add a proper `AbslHashValue()`
+// overload as a free (non-member) function. The overload will take an
+// existing hash state and should combine that state with state from the type.
+//
+// Example:
+//
+// template <typename H>
+// H AbslHashValue(H state, const MyType& v) {
+// return H::combine(std::move(state), v.field1, ..., v.fieldN);
+// }
+//
+// where `(field1, ..., fieldN)` are the members you would use on your
+// `operator==` to define equality.
+//
+// Notice that `AbslHashValue` is not a class member, but an ordinary function.
+// An `AbslHashValue` overload for a type should only be declared in the same
+// file and namespace as said type. The proper `AbslHashValue` implementation
+// for a given type will be discovered via ADL.
+//
+// Note: unlike `std::hash', `absl::Hash` should never be specialized. It must
+// only be extended by adding `AbslHashValue()` overloads.
+//
+template <typename T>
+using Hash = absl::hash_internal::Hash<T>;
+
+// HashState
+//
+// A type erased version of the hash state concept, for use in user-defined
+// `AbslHashValue` implementations that can't use templates (such as PImpl
+// classes, virtual functions, etc.). The type erasure adds overhead so it
+// should be avoided unless necessary.
+//
+// Note: This wrapper will only erase calls to:
+// combine_contiguous(H, const unsigned char*, size_t)
+//
+// All other calls will be handled internally and will not invoke overloads
+// provided by the wrapped class.
+//
+// Users of this class should still define a template `AbslHashValue` function,
+// but can use `absl::HashState::Create(&state)` to erase the type of the hash
+// state and dispatch to their private hashing logic.
+//
+// This state can be used like any other hash state. In particular, you can call
+// `HashState::combine()` and `HashState::combine_contiguous()` on it.
+//
+// Example:
+//
+// class Interface {
+// public:
+// template <typename H>
+// friend H AbslHashValue(H state, const Interface& value) {
+// state = H::combine(std::move(state), std::type_index(typeid(*this)));
+// value.HashValue(absl::HashState::Create(&state));
+// return state;
+// }
+// private:
+// virtual void HashValue(absl::HashState state) const = 0;
+// };
+//
+// class Impl : Interface {
+// private:
+// void HashValue(absl::HashState state) const override {
+// absl::HashState::combine(std::move(state), v1_, v2_);
+// }
+// int v1_;
+// std::string v2_;
+// };
+class HashState : public hash_internal::HashStateBase<HashState> {
+ public:
+ // HashState::Create()
+ //
+ // Create a new `HashState` instance that wraps `state`. All calls to
+ // `combine()` and `combine_contiguous()` on the new instance will be
+ // redirected to the original `state` object. The `state` object must outlive
+ // the `HashState` instance.
+ template <typename T>
+ static HashState Create(T* state) {
+ HashState s;
+ s.Init(state);
+ return s;
+ }
+
+ HashState(const HashState&) = delete;
+ HashState& operator=(const HashState&) = delete;
+ HashState(HashState&&) = default;
+ HashState& operator=(HashState&&) = default;
+
+ // HashState::combine()
+ //
+ // Combines an arbitrary number of values into a hash state, returning the
+ // updated state.
+ using HashState::HashStateBase::combine;
+
+ // HashState::combine_contiguous()
+ //
+ // Combines a contiguous array of `size` elements into a hash state, returning
+ // the updated state.
+ static HashState combine_contiguous(HashState hash_state,
+ const unsigned char* first, size_t size) {
+ hash_state.combine_contiguous_(hash_state.state_, first, size);
+ return hash_state;
+ }
+ using HashState::HashStateBase::combine_contiguous;
+
+ private:
+ HashState() = default;
+
+ template <typename T>
+ static void CombineContiguousImpl(void* p, const unsigned char* first,
+ size_t size) {
+ T& state = *static_cast<T*>(p);
+ state = T::combine_contiguous(std::move(state), first, size);
+ }
+
+ template <typename T>
+ void Init(T* state) {
+ state_ = state;
+ combine_contiguous_ = &CombineContiguousImpl<T>;
+ }
+
+ // Do not erase an already erased state.
+ void Init(HashState* state) {
+ state_ = state->state_;
+ combine_contiguous_ = state->combine_contiguous_;
+ }
+
+ void* state_;
+ void (*combine_contiguous_)(void*, const unsigned char*, size_t);
+};
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_HASH_HASH_H_
diff --git a/third_party/abseil/src/absl/hash/hash_test.cc b/third_party/abseil/src/absl/hash/hash_test.cc
new file mode 100644
index 0000000..1d2e6cf
--- /dev/null
+++ b/third_party/abseil/src/absl/hash/hash_test.cc
@@ -0,0 +1,976 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/hash/hash.h"
+
+#include <array>
+#include <bitset>
+#include <cstring>
+#include <deque>
+#include <forward_list>
+#include <functional>
+#include <iterator>
+#include <limits>
+#include <list>
+#include <map>
+#include <memory>
+#include <numeric>
+#include <random>
+#include <set>
+#include <string>
+#include <tuple>
+#include <type_traits>
+#include <unordered_map>
+#include <utility>
+#include <vector>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/container/flat_hash_set.h"
+#include "absl/hash/hash_testing.h"
+#include "absl/hash/internal/spy_hash_state.h"
+#include "absl/meta/type_traits.h"
+#include "absl/numeric/int128.h"
+#include "absl/strings/cord_test_helpers.h"
+
+namespace {
+
+using absl::Hash;
+using absl::hash_internal::SpyHashState;
+
+template <typename T>
+class HashValueIntTest : public testing::Test {
+};
+TYPED_TEST_SUITE_P(HashValueIntTest);
+
+template <typename T>
+SpyHashState SpyHash(const T& value) {
+ return SpyHashState::combine(SpyHashState(), value);
+}
+
+// Helper trait to verify if T is hashable. We use absl::Hash's poison status to
+// detect it.
+template <typename T>
+using is_hashable = std::is_default_constructible<absl::Hash<T>>;
+
+TYPED_TEST_P(HashValueIntTest, BasicUsage) {
+ EXPECT_TRUE((is_hashable<TypeParam>::value));
+
+ TypeParam n = 42;
+ EXPECT_EQ(SpyHash(n), SpyHash(TypeParam{42}));
+ EXPECT_NE(SpyHash(n), SpyHash(TypeParam{0}));
+ EXPECT_NE(SpyHash(std::numeric_limits<TypeParam>::max()),
+ SpyHash(std::numeric_limits<TypeParam>::min()));
+}
+
+TYPED_TEST_P(HashValueIntTest, FastPath) {
+ // Test the fast-path to make sure the values are the same.
+ TypeParam n = 42;
+ EXPECT_EQ(absl::Hash<TypeParam>{}(n),
+ absl::Hash<std::tuple<TypeParam>>{}(std::tuple<TypeParam>(n)));
+}
+
+REGISTER_TYPED_TEST_CASE_P(HashValueIntTest, BasicUsage, FastPath);
+using IntTypes = testing::Types<unsigned char, char, int, int32_t, int64_t,
+ uint32_t, uint64_t, size_t>;
+INSTANTIATE_TYPED_TEST_CASE_P(My, HashValueIntTest, IntTypes);
+
+enum LegacyEnum { kValue1, kValue2, kValue3 };
+
+enum class EnumClass { kValue4, kValue5, kValue6 };
+
+TEST(HashValueTest, EnumAndBool) {
+ EXPECT_TRUE((is_hashable<LegacyEnum>::value));
+ EXPECT_TRUE((is_hashable<EnumClass>::value));
+ EXPECT_TRUE((is_hashable<bool>::value));
+
+ EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(std::make_tuple(
+ LegacyEnum::kValue1, LegacyEnum::kValue2, LegacyEnum::kValue3)));
+ EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(std::make_tuple(
+ EnumClass::kValue4, EnumClass::kValue5, EnumClass::kValue6)));
+ EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(
+ std::make_tuple(true, false)));
+}
+
+TEST(HashValueTest, FloatingPoint) {
+ EXPECT_TRUE((is_hashable<float>::value));
+ EXPECT_TRUE((is_hashable<double>::value));
+ EXPECT_TRUE((is_hashable<long double>::value));
+
+ EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(
+ std::make_tuple(42.f, 0.f, -0.f, std::numeric_limits<float>::infinity(),
+ -std::numeric_limits<float>::infinity())));
+
+ EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(
+ std::make_tuple(42., 0., -0., std::numeric_limits<double>::infinity(),
+ -std::numeric_limits<double>::infinity())));
+
+ EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(std::make_tuple(
+ // Add some values with small exponent to test that NORMAL values also
+ // append their category.
+ .5L, 1.L, 2.L, 4.L, 42.L, 0.L, -0.L,
+ 17 * static_cast<long double>(std::numeric_limits<double>::max()),
+ std::numeric_limits<long double>::infinity(),
+ -std::numeric_limits<long double>::infinity())));
+}
+
+TEST(HashValueTest, Pointer) {
+ EXPECT_TRUE((is_hashable<int*>::value));
+
+ int i;
+ int* ptr = &i;
+ int* n = nullptr;
+
+ EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(
+ std::make_tuple(&i, ptr, nullptr, ptr + 1, n)));
+}
+
+TEST(HashValueTest, PointerAlignment) {
+ // We want to make sure that pointer alignment will not cause bits to be
+ // stuck.
+
+ constexpr size_t kTotalSize = 1 << 20;
+ std::unique_ptr<char[]> data(new char[kTotalSize]);
+ constexpr size_t kLog2NumValues = 5;
+ constexpr size_t kNumValues = 1 << kLog2NumValues;
+
+ for (size_t align = 1; align < kTotalSize / kNumValues;
+ align < 8 ? align += 1 : align < 1024 ? align += 8 : align += 32) {
+ SCOPED_TRACE(align);
+ ASSERT_LE(align * kNumValues, kTotalSize);
+
+ size_t bits_or = 0;
+ size_t bits_and = ~size_t{};
+
+ for (size_t i = 0; i < kNumValues; ++i) {
+ size_t hash = absl::Hash<void*>()(data.get() + i * align);
+ bits_or |= hash;
+ bits_and &= hash;
+ }
+
+ // Limit the scope to the bits we would be using for Swisstable.
+ constexpr size_t kMask = (1 << (kLog2NumValues + 7)) - 1;
+ size_t stuck_bits = (~bits_or | bits_and) & kMask;
+ EXPECT_EQ(stuck_bits, 0) << "0x" << std::hex << stuck_bits;
+ }
+}
+
+TEST(HashValueTest, PairAndTuple) {
+ EXPECT_TRUE((is_hashable<std::pair<int, int>>::value));
+ EXPECT_TRUE((is_hashable<std::pair<const int&, const int&>>::value));
+ EXPECT_TRUE((is_hashable<std::tuple<int&, int&>>::value));
+ EXPECT_TRUE((is_hashable<std::tuple<int&&, int&&>>::value));
+
+ EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(std::make_tuple(
+ std::make_pair(0, 42), std::make_pair(0, 42), std::make_pair(42, 0),
+ std::make_pair(0, 0), std::make_pair(42, 42), std::make_pair(1, 42))));
+
+ EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(
+ std::make_tuple(std::make_tuple(0, 0, 0), std::make_tuple(0, 0, 42),
+ std::make_tuple(0, 23, 0), std::make_tuple(17, 0, 0),
+ std::make_tuple(42, 0, 0), std::make_tuple(3, 9, 9),
+ std::make_tuple(0, 0, -42))));
+
+ // Test that tuples of lvalue references work (so we need a few lvalues):
+ int a = 0, b = 1, c = 17, d = 23;
+ EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(std::make_tuple(
+ std::tie(a, a), std::tie(a, b), std::tie(b, c), std::tie(c, d))));
+
+ // Test that tuples of rvalue references work:
+ EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(std::make_tuple(
+ std::forward_as_tuple(0, 0, 0), std::forward_as_tuple(0, 0, 42),
+ std::forward_as_tuple(0, 23, 0), std::forward_as_tuple(17, 0, 0),
+ std::forward_as_tuple(42, 0, 0), std::forward_as_tuple(3, 9, 9),
+ std::forward_as_tuple(0, 0, -42))));
+}
+
+TEST(HashValueTest, CombineContiguousWorks) {
+ std::vector<std::tuple<int>> v1 = {std::make_tuple(1), std::make_tuple(3)};
+ std::vector<std::tuple<int>> v2 = {std::make_tuple(1), std::make_tuple(2)};
+
+ auto vh1 = SpyHash(v1);
+ auto vh2 = SpyHash(v2);
+ EXPECT_NE(vh1, vh2);
+}
+
+struct DummyDeleter {
+ template <typename T>
+ void operator() (T* ptr) {}
+};
+
+struct SmartPointerEq {
+ template <typename T, typename U>
+ bool operator()(const T& t, const U& u) const {
+ return GetPtr(t) == GetPtr(u);
+ }
+
+ template <typename T>
+ static auto GetPtr(const T& t) -> decltype(&*t) {
+ return t ? &*t : nullptr;
+ }
+
+ static std::nullptr_t GetPtr(std::nullptr_t) { return nullptr; }
+};
+
+TEST(HashValueTest, SmartPointers) {
+ EXPECT_TRUE((is_hashable<std::unique_ptr<int>>::value));
+ EXPECT_TRUE((is_hashable<std::unique_ptr<int, DummyDeleter>>::value));
+ EXPECT_TRUE((is_hashable<std::shared_ptr<int>>::value));
+
+ int i, j;
+ std::unique_ptr<int, DummyDeleter> unique1(&i);
+ std::unique_ptr<int, DummyDeleter> unique2(&i);
+ std::unique_ptr<int, DummyDeleter> unique_other(&j);
+ std::unique_ptr<int, DummyDeleter> unique_null;
+
+ std::shared_ptr<int> shared1(&i, DummyDeleter());
+ std::shared_ptr<int> shared2(&i, DummyDeleter());
+ std::shared_ptr<int> shared_other(&j, DummyDeleter());
+ std::shared_ptr<int> shared_null;
+
+ // Sanity check of the Eq function.
+ ASSERT_TRUE(SmartPointerEq{}(unique1, shared1));
+ ASSERT_FALSE(SmartPointerEq{}(unique1, shared_other));
+ ASSERT_TRUE(SmartPointerEq{}(unique_null, nullptr));
+ ASSERT_FALSE(SmartPointerEq{}(shared2, nullptr));
+
+ EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(
+ std::forward_as_tuple(&i, nullptr, //
+ unique1, unique2, unique_null, //
+ absl::make_unique<int>(), //
+ shared1, shared2, shared_null, //
+ std::make_shared<int>()),
+ SmartPointerEq{}));
+}
+
+TEST(HashValueTest, FunctionPointer) {
+ using Func = int (*)();
+ EXPECT_TRUE(is_hashable<Func>::value);
+
+ Func p1 = [] { return 2; }, p2 = [] { return 1; };
+ EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(
+ std::make_tuple(p1, p2, nullptr)));
+}
+
+struct WrapInTuple {
+ template <typename T>
+ std::tuple<int, T, size_t> operator()(const T& t) const {
+ return std::make_tuple(7, t, 0xdeadbeef);
+ }
+};
+
+absl::Cord FlatCord(absl::string_view sv) {
+ absl::Cord c(sv);
+ c.Flatten();
+ return c;
+}
+
+absl::Cord FragmentedCord(absl::string_view sv) {
+ if (sv.size() < 2) {
+ return absl::Cord(sv);
+ }
+ size_t halfway = sv.size() / 2;
+ std::vector<absl::string_view> parts = {sv.substr(0, halfway),
+ sv.substr(halfway)};
+ return absl::MakeFragmentedCord(parts);
+}
+
+TEST(HashValueTest, Strings) {
+ EXPECT_TRUE((is_hashable<std::string>::value));
+
+ const std::string small = "foo";
+ const std::string dup = "foofoo";
+ const std::string large = std::string(2048, 'x'); // multiple of chunk size
+ const std::string huge = std::string(5000, 'a'); // not a multiple
+
+ EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(std::make_tuple( //
+ std::string(), absl::string_view(), absl::Cord(), //
+ std::string(""), absl::string_view(""), absl::Cord(""), //
+ std::string(small), absl::string_view(small), absl::Cord(small), //
+ std::string(dup), absl::string_view(dup), absl::Cord(dup), //
+ std::string(large), absl::string_view(large), absl::Cord(large), //
+ std::string(huge), absl::string_view(huge), FlatCord(huge), //
+ FragmentedCord(huge))));
+
+ // Also check that nested types maintain the same hash.
+ const WrapInTuple t{};
+ EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(std::make_tuple( //
+ t(std::string()), t(absl::string_view()), t(absl::Cord()), //
+ t(std::string("")), t(absl::string_view("")), t(absl::Cord("")), //
+ t(std::string(small)), t(absl::string_view(small)), //
+ t(absl::Cord(small)), //
+ t(std::string(dup)), t(absl::string_view(dup)), t(absl::Cord(dup)), //
+ t(std::string(large)), t(absl::string_view(large)), //
+ t(absl::Cord(large)), //
+ t(std::string(huge)), t(absl::string_view(huge)), //
+ t(FlatCord(huge)), t(FragmentedCord(huge)))));
+
+ // Make sure that hashing a `const char*` does not use its string-value.
+ EXPECT_NE(SpyHash(static_cast<const char*>("ABC")),
+ SpyHash(absl::string_view("ABC")));
+}
+
+TEST(HashValueTest, WString) {
+ EXPECT_TRUE((is_hashable<std::wstring>::value));
+
+ EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(std::make_tuple(
+ std::wstring(), std::wstring(L"ABC"), std::wstring(L"ABC"),
+ std::wstring(L"Some other different string"),
+ std::wstring(L"Iñtërnâtiônàlizætiøn"))));
+}
+
+TEST(HashValueTest, U16String) {
+ EXPECT_TRUE((is_hashable<std::u16string>::value));
+
+ EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(std::make_tuple(
+ std::u16string(), std::u16string(u"ABC"), std::u16string(u"ABC"),
+ std::u16string(u"Some other different string"),
+ std::u16string(u"Iñtërnâtiônàlizætiøn"))));
+}
+
+TEST(HashValueTest, U32String) {
+ EXPECT_TRUE((is_hashable<std::u32string>::value));
+
+ EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(std::make_tuple(
+ std::u32string(), std::u32string(U"ABC"), std::u32string(U"ABC"),
+ std::u32string(U"Some other different string"),
+ std::u32string(U"Iñtërnâtiônàlizætiøn"))));
+}
+
+TEST(HashValueTest, StdArray) {
+ EXPECT_TRUE((is_hashable<std::array<int, 3>>::value));
+
+ EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(
+ std::make_tuple(std::array<int, 3>{}, std::array<int, 3>{{0, 23, 42}})));
+}
+
+TEST(HashValueTest, StdBitset) {
+ EXPECT_TRUE((is_hashable<std::bitset<257>>::value));
+
+ EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(
+ {std::bitset<2>("00"), std::bitset<2>("01"), std::bitset<2>("10"),
+ std::bitset<2>("11")}));
+ EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(
+ {std::bitset<5>("10101"), std::bitset<5>("10001"), std::bitset<5>()}));
+
+ constexpr int kNumBits = 256;
+ std::array<std::string, 6> bit_strings;
+ bit_strings.fill(std::string(kNumBits, '1'));
+ bit_strings[1][0] = '0';
+ bit_strings[2][1] = '0';
+ bit_strings[3][kNumBits / 3] = '0';
+ bit_strings[4][kNumBits - 2] = '0';
+ bit_strings[5][kNumBits - 1] = '0';
+ EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(
+ {std::bitset<kNumBits>(bit_strings[0].c_str()),
+ std::bitset<kNumBits>(bit_strings[1].c_str()),
+ std::bitset<kNumBits>(bit_strings[2].c_str()),
+ std::bitset<kNumBits>(bit_strings[3].c_str()),
+ std::bitset<kNumBits>(bit_strings[4].c_str()),
+ std::bitset<kNumBits>(bit_strings[5].c_str())}));
+} // namespace
+
+template <typename T>
+class HashValueSequenceTest : public testing::Test {
+};
+TYPED_TEST_SUITE_P(HashValueSequenceTest);
+
+TYPED_TEST_P(HashValueSequenceTest, BasicUsage) {
+ EXPECT_TRUE((is_hashable<TypeParam>::value));
+
+ using ValueType = typename TypeParam::value_type;
+ auto a = static_cast<ValueType>(0);
+ auto b = static_cast<ValueType>(23);
+ auto c = static_cast<ValueType>(42);
+
+ EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(
+ std::make_tuple(TypeParam(), TypeParam{}, TypeParam{a, b, c},
+ TypeParam{a, b}, TypeParam{b, c})));
+}
+
+REGISTER_TYPED_TEST_CASE_P(HashValueSequenceTest, BasicUsage);
+using IntSequenceTypes =
+ testing::Types<std::deque<int>, std::forward_list<int>, std::list<int>,
+ std::vector<int>, std::vector<bool>, std::set<int>,
+ std::multiset<int>>;
+INSTANTIATE_TYPED_TEST_CASE_P(My, HashValueSequenceTest, IntSequenceTypes);
+
+// Private type that only supports AbslHashValue to make sure our chosen hash
+// implementation is recursive within absl::Hash.
+// It uses std::abs() on the value to provide different bitwise representations
+// of the same logical value.
+struct Private {
+ int i;
+ template <typename H>
+ friend H AbslHashValue(H h, Private p) {
+ return H::combine(std::move(h), std::abs(p.i));
+ }
+
+ friend bool operator==(Private a, Private b) {
+ return std::abs(a.i) == std::abs(b.i);
+ }
+
+ friend std::ostream& operator<<(std::ostream& o, Private p) {
+ return o << p.i;
+ }
+};
+
+// Test helper for combine_piecewise_buffer. It holds a string_view to the
+// buffer-to-be-hashed. Its AbslHashValue specialization will split up its
+// contents at the character offsets requested.
+class PiecewiseHashTester {
+ public:
+ // Create a hash view of a buffer to be hashed contiguously.
+ explicit PiecewiseHashTester(absl::string_view buf)
+ : buf_(buf), piecewise_(false), split_locations_() {}
+
+ // Create a hash view of a buffer to be hashed piecewise, with breaks at the
+ // given locations.
+ PiecewiseHashTester(absl::string_view buf, std::set<size_t> split_locations)
+ : buf_(buf),
+ piecewise_(true),
+ split_locations_(std::move(split_locations)) {}
+
+ template <typename H>
+ friend H AbslHashValue(H h, const PiecewiseHashTester& p) {
+ if (!p.piecewise_) {
+ return H::combine_contiguous(std::move(h), p.buf_.data(), p.buf_.size());
+ }
+ absl::hash_internal::PiecewiseCombiner combiner;
+ if (p.split_locations_.empty()) {
+ h = combiner.add_buffer(std::move(h), p.buf_.data(), p.buf_.size());
+ return combiner.finalize(std::move(h));
+ }
+ size_t begin = 0;
+ for (size_t next : p.split_locations_) {
+ absl::string_view chunk = p.buf_.substr(begin, next - begin);
+ h = combiner.add_buffer(std::move(h), chunk.data(), chunk.size());
+ begin = next;
+ }
+ absl::string_view last_chunk = p.buf_.substr(begin);
+ if (!last_chunk.empty()) {
+ h = combiner.add_buffer(std::move(h), last_chunk.data(),
+ last_chunk.size());
+ }
+ return combiner.finalize(std::move(h));
+ }
+
+ private:
+ absl::string_view buf_;
+ bool piecewise_;
+ std::set<size_t> split_locations_;
+};
+
+// Dummy object that hashes as two distinct contiguous buffers, "foo" followed
+// by "bar"
+struct DummyFooBar {
+ template <typename H>
+ friend H AbslHashValue(H h, const DummyFooBar&) {
+ const char* foo = "foo";
+ const char* bar = "bar";
+ h = H::combine_contiguous(std::move(h), foo, 3);
+ h = H::combine_contiguous(std::move(h), bar, 3);
+ return h;
+ }
+};
+
+TEST(HashValueTest, CombinePiecewiseBuffer) {
+ absl::Hash<PiecewiseHashTester> hash;
+
+ // Check that hashing an empty buffer through the piecewise API works.
+ EXPECT_EQ(hash(PiecewiseHashTester("")), hash(PiecewiseHashTester("", {})));
+
+ // Similarly, small buffers should give consistent results
+ EXPECT_EQ(hash(PiecewiseHashTester("foobar")),
+ hash(PiecewiseHashTester("foobar", {})));
+ EXPECT_EQ(hash(PiecewiseHashTester("foobar")),
+ hash(PiecewiseHashTester("foobar", {3})));
+
+ // But hashing "foobar" in pieces gives a different answer than hashing "foo"
+ // contiguously, then "bar" contiguously.
+ EXPECT_NE(hash(PiecewiseHashTester("foobar", {3})),
+ absl::Hash<DummyFooBar>()(DummyFooBar{}));
+
+ // Test hashing a large buffer incrementally, broken up in several different
+ // ways. Arrange for breaks on and near the stride boundaries to look for
+ // off-by-one errors in the implementation.
+ //
+ // This test is run on a buffer that is a multiple of the stride size, and one
+ // that isn't.
+ for (size_t big_buffer_size : {1024 * 2 + 512, 1024 * 3}) {
+ SCOPED_TRACE(big_buffer_size);
+ std::string big_buffer;
+ for (int i = 0; i < big_buffer_size; ++i) {
+ // Arbitrary string
+ big_buffer.push_back(32 + (i * (i / 3)) % 64);
+ }
+ auto big_buffer_hash = hash(PiecewiseHashTester(big_buffer));
+
+ const int possible_breaks = 9;
+ size_t breaks[possible_breaks] = {1, 512, 1023, 1024, 1025,
+ 1536, 2047, 2048, 2049};
+ for (unsigned test_mask = 0; test_mask < (1u << possible_breaks);
+ ++test_mask) {
+ SCOPED_TRACE(test_mask);
+ std::set<size_t> break_locations;
+ for (int j = 0; j < possible_breaks; ++j) {
+ if (test_mask & (1u << j)) {
+ break_locations.insert(breaks[j]);
+ }
+ }
+ EXPECT_EQ(
+ hash(PiecewiseHashTester(big_buffer, std::move(break_locations))),
+ big_buffer_hash);
+ }
+ }
+}
+
+TEST(HashValueTest, PrivateSanity) {
+ // Sanity check that Private is working as the tests below expect it to work.
+ EXPECT_TRUE(is_hashable<Private>::value);
+ EXPECT_NE(SpyHash(Private{0}), SpyHash(Private{1}));
+ EXPECT_EQ(SpyHash(Private{1}), SpyHash(Private{1}));
+}
+
+TEST(HashValueTest, Optional) {
+ EXPECT_TRUE(is_hashable<absl::optional<Private>>::value);
+
+ using O = absl::optional<Private>;
+ EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(
+ std::make_tuple(O{}, O{{1}}, O{{-1}}, O{{10}})));
+}
+
+TEST(HashValueTest, Variant) {
+ using V = absl::variant<Private, std::string>;
+ EXPECT_TRUE(is_hashable<V>::value);
+
+ EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(std::make_tuple(
+ V(Private{1}), V(Private{-1}), V(Private{2}), V("ABC"), V("BCD"))));
+
+#if ABSL_META_INTERNAL_STD_HASH_SFINAE_FRIENDLY_
+ struct S {};
+ EXPECT_FALSE(is_hashable<absl::variant<S>>::value);
+#endif
+}
+
+TEST(HashValueTest, Maps) {
+ EXPECT_TRUE((is_hashable<std::map<int, std::string>>::value));
+
+ using M = std::map<int, std::string>;
+ EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(std::make_tuple(
+ M{}, M{{0, "foo"}}, M{{1, "foo"}}, M{{0, "bar"}}, M{{1, "bar"}},
+ M{{0, "foo"}, {42, "bar"}}, M{{1, "foo"}, {42, "bar"}},
+ M{{1, "foo"}, {43, "bar"}}, M{{1, "foo"}, {43, "baz"}})));
+
+ using MM = std::multimap<int, std::string>;
+ EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(std::make_tuple(
+ MM{}, MM{{0, "foo"}}, MM{{1, "foo"}}, MM{{0, "bar"}}, MM{{1, "bar"}},
+ MM{{0, "foo"}, {0, "bar"}}, MM{{0, "bar"}, {0, "foo"}},
+ MM{{0, "foo"}, {42, "bar"}}, MM{{1, "foo"}, {42, "bar"}},
+ MM{{1, "foo"}, {1, "foo"}, {43, "bar"}}, MM{{1, "foo"}, {43, "baz"}})));
+}
+
+TEST(HashValueTest, ReferenceWrapper) {
+ EXPECT_TRUE(is_hashable<std::reference_wrapper<Private>>::value);
+
+ Private p1{1}, p10{10};
+ EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(std::make_tuple(
+ p1, p10, std::ref(p1), std::ref(p10), std::cref(p1), std::cref(p10))));
+
+ EXPECT_TRUE(is_hashable<std::reference_wrapper<int>>::value);
+ int one = 1, ten = 10;
+ EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(std::make_tuple(
+ one, ten, std::ref(one), std::ref(ten), std::cref(one), std::cref(ten))));
+
+ EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(
+ std::make_tuple(std::tuple<std::reference_wrapper<int>>(std::ref(one)),
+ std::tuple<std::reference_wrapper<int>>(std::ref(ten)),
+ std::tuple<int>(one), std::tuple<int>(ten))));
+}
+
+template <typename T, typename = void>
+struct IsHashCallable : std::false_type {};
+
+template <typename T>
+struct IsHashCallable<T, absl::void_t<decltype(std::declval<absl::Hash<T>>()(
+ std::declval<const T&>()))>> : std::true_type {};
+
+template <typename T, typename = void>
+struct IsAggregateInitializable : std::false_type {};
+
+template <typename T>
+struct IsAggregateInitializable<T, absl::void_t<decltype(T{})>>
+ : std::true_type {};
+
+TEST(IsHashableTest, ValidHash) {
+ EXPECT_TRUE((is_hashable<int>::value));
+ EXPECT_TRUE(std::is_default_constructible<absl::Hash<int>>::value);
+ EXPECT_TRUE(std::is_copy_constructible<absl::Hash<int>>::value);
+ EXPECT_TRUE(std::is_move_constructible<absl::Hash<int>>::value);
+ EXPECT_TRUE(absl::is_copy_assignable<absl::Hash<int>>::value);
+ EXPECT_TRUE(absl::is_move_assignable<absl::Hash<int>>::value);
+ EXPECT_TRUE(IsHashCallable<int>::value);
+ EXPECT_TRUE(IsAggregateInitializable<absl::Hash<int>>::value);
+}
+
+#if ABSL_META_INTERNAL_STD_HASH_SFINAE_FRIENDLY_
+TEST(IsHashableTest, PoisonHash) {
+ struct X {};
+ EXPECT_FALSE((is_hashable<X>::value));
+ EXPECT_FALSE(std::is_default_constructible<absl::Hash<X>>::value);
+ EXPECT_FALSE(std::is_copy_constructible<absl::Hash<X>>::value);
+ EXPECT_FALSE(std::is_move_constructible<absl::Hash<X>>::value);
+ EXPECT_FALSE(absl::is_copy_assignable<absl::Hash<X>>::value);
+ EXPECT_FALSE(absl::is_move_assignable<absl::Hash<X>>::value);
+ EXPECT_FALSE(IsHashCallable<X>::value);
+#if !defined(__GNUC__) || __GNUC__ < 9
+ // This doesn't compile on GCC 9.
+ EXPECT_FALSE(IsAggregateInitializable<absl::Hash<X>>::value);
+#endif
+}
+#endif // ABSL_META_INTERNAL_STD_HASH_SFINAE_FRIENDLY_
+
+// Hashable types
+//
+// These types exist simply to exercise various AbslHashValue behaviors, so
+// they are named by what their AbslHashValue overload does.
+struct NoOp {
+ template <typename HashCode>
+ friend HashCode AbslHashValue(HashCode h, NoOp n) {
+ return h;
+ }
+};
+
+struct EmptyCombine {
+ template <typename HashCode>
+ friend HashCode AbslHashValue(HashCode h, EmptyCombine e) {
+ return HashCode::combine(std::move(h));
+ }
+};
+
+template <typename Int>
+struct CombineIterative {
+ template <typename HashCode>
+ friend HashCode AbslHashValue(HashCode h, CombineIterative c) {
+ for (int i = 0; i < 5; ++i) {
+ h = HashCode::combine(std::move(h), Int(i));
+ }
+ return h;
+ }
+};
+
+template <typename Int>
+struct CombineVariadic {
+ template <typename HashCode>
+ friend HashCode AbslHashValue(HashCode h, CombineVariadic c) {
+ return HashCode::combine(std::move(h), Int(0), Int(1), Int(2), Int(3),
+ Int(4));
+ }
+};
+enum class InvokeTag {
+ kUniquelyRepresented,
+ kHashValue,
+#if ABSL_HASH_INTERNAL_SUPPORT_LEGACY_HASH_
+ kLegacyHash,
+#endif // ABSL_HASH_INTERNAL_SUPPORT_LEGACY_HASH_
+ kStdHash,
+ kNone
+};
+
+template <InvokeTag T>
+using InvokeTagConstant = std::integral_constant<InvokeTag, T>;
+
+template <InvokeTag... Tags>
+struct MinTag;
+
+template <InvokeTag a, InvokeTag b, InvokeTag... Tags>
+struct MinTag<a, b, Tags...> : MinTag<(a < b ? a : b), Tags...> {};
+
+template <InvokeTag a>
+struct MinTag<a> : InvokeTagConstant<a> {};
+
+template <InvokeTag... Tags>
+struct CustomHashType {
+ explicit CustomHashType(size_t val) : value(val) {}
+ size_t value;
+};
+
+template <InvokeTag allowed, InvokeTag... tags>
+struct EnableIfContained
+ : std::enable_if<absl::disjunction<
+ std::integral_constant<bool, allowed == tags>...>::value> {};
+
+template <
+ typename H, InvokeTag... Tags,
+ typename = typename EnableIfContained<InvokeTag::kHashValue, Tags...>::type>
+H AbslHashValue(H state, CustomHashType<Tags...> t) {
+ static_assert(MinTag<Tags...>::value == InvokeTag::kHashValue, "");
+ return H::combine(std::move(state),
+ t.value + static_cast<int>(InvokeTag::kHashValue));
+}
+
+} // namespace
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace hash_internal {
+template <InvokeTag... Tags>
+struct is_uniquely_represented<
+ CustomHashType<Tags...>,
+ typename EnableIfContained<InvokeTag::kUniquelyRepresented, Tags...>::type>
+ : std::true_type {};
+} // namespace hash_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#if ABSL_HASH_INTERNAL_SUPPORT_LEGACY_HASH_
+namespace ABSL_INTERNAL_LEGACY_HASH_NAMESPACE {
+template <InvokeTag... Tags>
+struct hash<CustomHashType<Tags...>> {
+ template <InvokeTag... TagsIn, typename = typename EnableIfContained<
+ InvokeTag::kLegacyHash, TagsIn...>::type>
+ size_t operator()(CustomHashType<TagsIn...> t) const {
+ static_assert(MinTag<Tags...>::value == InvokeTag::kLegacyHash, "");
+ return t.value + static_cast<int>(InvokeTag::kLegacyHash);
+ }
+};
+} // namespace ABSL_INTERNAL_LEGACY_HASH_NAMESPACE
+#endif // ABSL_HASH_INTERNAL_SUPPORT_LEGACY_HASH_
+
+namespace std {
+template <InvokeTag... Tags> // NOLINT
+struct hash<CustomHashType<Tags...>> {
+ template <InvokeTag... TagsIn, typename = typename EnableIfContained<
+ InvokeTag::kStdHash, TagsIn...>::type>
+ size_t operator()(CustomHashType<TagsIn...> t) const {
+ static_assert(MinTag<Tags...>::value == InvokeTag::kStdHash, "");
+ return t.value + static_cast<int>(InvokeTag::kStdHash);
+ }
+};
+} // namespace std
+
+namespace {
+
+template <typename... T>
+void TestCustomHashType(InvokeTagConstant<InvokeTag::kNone>, T...) {
+ using type = CustomHashType<T::value...>;
+ SCOPED_TRACE(testing::PrintToString(std::vector<InvokeTag>{T::value...}));
+ EXPECT_TRUE(is_hashable<type>());
+ EXPECT_TRUE(is_hashable<const type>());
+ EXPECT_TRUE(is_hashable<const type&>());
+
+ const size_t offset = static_cast<int>(std::min({T::value...}));
+ EXPECT_EQ(SpyHash(type(7)), SpyHash(size_t{7 + offset}));
+}
+
+void TestCustomHashType(InvokeTagConstant<InvokeTag::kNone>) {
+#if ABSL_META_INTERNAL_STD_HASH_SFINAE_FRIENDLY_
+ // is_hashable is false if we don't support any of the hooks.
+ using type = CustomHashType<>;
+ EXPECT_FALSE(is_hashable<type>());
+ EXPECT_FALSE(is_hashable<const type>());
+ EXPECT_FALSE(is_hashable<const type&>());
+#endif // ABSL_META_INTERNAL_STD_HASH_SFINAE_FRIENDLY_
+}
+
+template <InvokeTag Tag, typename... T>
+void TestCustomHashType(InvokeTagConstant<Tag> tag, T... t) {
+ constexpr auto next = static_cast<InvokeTag>(static_cast<int>(Tag) + 1);
+ TestCustomHashType(InvokeTagConstant<next>(), tag, t...);
+ TestCustomHashType(InvokeTagConstant<next>(), t...);
+}
+
+TEST(HashTest, CustomHashType) {
+ TestCustomHashType(InvokeTagConstant<InvokeTag{}>());
+}
+
+TEST(HashTest, NoOpsAreEquivalent) {
+ EXPECT_EQ(Hash<NoOp>()({}), Hash<NoOp>()({}));
+ EXPECT_EQ(Hash<NoOp>()({}), Hash<EmptyCombine>()({}));
+}
+
+template <typename T>
+class HashIntTest : public testing::Test {
+};
+TYPED_TEST_SUITE_P(HashIntTest);
+
+TYPED_TEST_P(HashIntTest, BasicUsage) {
+ EXPECT_NE(Hash<NoOp>()({}), Hash<TypeParam>()(0));
+ EXPECT_NE(Hash<NoOp>()({}),
+ Hash<TypeParam>()(std::numeric_limits<TypeParam>::max()));
+ if (std::numeric_limits<TypeParam>::min() != 0) {
+ EXPECT_NE(Hash<NoOp>()({}),
+ Hash<TypeParam>()(std::numeric_limits<TypeParam>::min()));
+ }
+
+ EXPECT_EQ(Hash<CombineIterative<TypeParam>>()({}),
+ Hash<CombineVariadic<TypeParam>>()({}));
+}
+
+REGISTER_TYPED_TEST_CASE_P(HashIntTest, BasicUsage);
+using IntTypes = testing::Types<unsigned char, char, int, int32_t, int64_t,
+ uint32_t, uint64_t, size_t>;
+INSTANTIATE_TYPED_TEST_CASE_P(My, HashIntTest, IntTypes);
+
+struct StructWithPadding {
+ char c;
+ int i;
+
+ template <typename H>
+ friend H AbslHashValue(H hash_state, const StructWithPadding& s) {
+ return H::combine(std::move(hash_state), s.c, s.i);
+ }
+};
+
+static_assert(sizeof(StructWithPadding) > sizeof(char) + sizeof(int),
+ "StructWithPadding doesn't have padding");
+static_assert(std::is_standard_layout<StructWithPadding>::value, "");
+
+// This check has to be disabled because libstdc++ doesn't support it.
+// static_assert(std::is_trivially_constructible<StructWithPadding>::value, "");
+
+template <typename T>
+struct ArraySlice {
+ T* begin;
+ T* end;
+
+ template <typename H>
+ friend H AbslHashValue(H hash_state, const ArraySlice& slice) {
+ for (auto t = slice.begin; t != slice.end; ++t) {
+ hash_state = H::combine(std::move(hash_state), *t);
+ }
+ return hash_state;
+ }
+};
+
+TEST(HashTest, HashNonUniquelyRepresentedType) {
+ // Create equal StructWithPadding objects that are known to have non-equal
+ // padding bytes.
+ static const size_t kNumStructs = 10;
+ unsigned char buffer1[kNumStructs * sizeof(StructWithPadding)];
+ std::memset(buffer1, 0, sizeof(buffer1));
+ auto* s1 = reinterpret_cast<StructWithPadding*>(buffer1);
+
+ unsigned char buffer2[kNumStructs * sizeof(StructWithPadding)];
+ std::memset(buffer2, 255, sizeof(buffer2));
+ auto* s2 = reinterpret_cast<StructWithPadding*>(buffer2);
+ for (int i = 0; i < kNumStructs; ++i) {
+ SCOPED_TRACE(i);
+ s1[i].c = s2[i].c = '0' + i;
+ s1[i].i = s2[i].i = i;
+ ASSERT_FALSE(memcmp(buffer1 + i * sizeof(StructWithPadding),
+ buffer2 + i * sizeof(StructWithPadding),
+ sizeof(StructWithPadding)) == 0)
+ << "Bug in test code: objects do not have unequal"
+ << " object representations";
+ }
+
+ EXPECT_EQ(Hash<StructWithPadding>()(s1[0]), Hash<StructWithPadding>()(s2[0]));
+ EXPECT_EQ(Hash<ArraySlice<StructWithPadding>>()({s1, s1 + kNumStructs}),
+ Hash<ArraySlice<StructWithPadding>>()({s2, s2 + kNumStructs}));
+}
+
+TEST(HashTest, StandardHashContainerUsage) {
+ std::unordered_map<int, std::string, Hash<int>> map = {{0, "foo"},
+ {42, "bar"}};
+
+ EXPECT_NE(map.find(0), map.end());
+ EXPECT_EQ(map.find(1), map.end());
+ EXPECT_NE(map.find(0u), map.end());
+}
+
+struct ConvertibleFromNoOp {
+ ConvertibleFromNoOp(NoOp) {} // NOLINT(runtime/explicit)
+
+ template <typename H>
+ friend H AbslHashValue(H hash_state, ConvertibleFromNoOp) {
+ return H::combine(std::move(hash_state), 1);
+ }
+};
+
+TEST(HashTest, HeterogeneousCall) {
+ EXPECT_NE(Hash<ConvertibleFromNoOp>()(NoOp()),
+ Hash<NoOp>()(NoOp()));
+}
+
+TEST(IsUniquelyRepresentedTest, SanityTest) {
+ using absl::hash_internal::is_uniquely_represented;
+
+ EXPECT_TRUE(is_uniquely_represented<unsigned char>::value);
+ EXPECT_TRUE(is_uniquely_represented<int>::value);
+ EXPECT_FALSE(is_uniquely_represented<bool>::value);
+ EXPECT_FALSE(is_uniquely_represented<int*>::value);
+}
+
+struct IntAndString {
+ int i;
+ std::string s;
+
+ template <typename H>
+ friend H AbslHashValue(H hash_state, IntAndString int_and_string) {
+ return H::combine(std::move(hash_state), int_and_string.s,
+ int_and_string.i);
+ }
+};
+
+TEST(HashTest, SmallValueOn64ByteBoundary) {
+ Hash<IntAndString>()(IntAndString{0, std::string(63, '0')});
+}
+
+struct TypeErased {
+ size_t n;
+
+ template <typename H>
+ friend H AbslHashValue(H hash_state, const TypeErased& v) {
+ v.HashValue(absl::HashState::Create(&hash_state));
+ return hash_state;
+ }
+
+ void HashValue(absl::HashState state) const {
+ absl::HashState::combine(std::move(state), n);
+ }
+};
+
+TEST(HashTest, TypeErased) {
+ EXPECT_TRUE((is_hashable<TypeErased>::value));
+ EXPECT_TRUE((is_hashable<std::pair<TypeErased, int>>::value));
+
+ EXPECT_EQ(SpyHash(TypeErased{7}), SpyHash(size_t{7}));
+ EXPECT_NE(SpyHash(TypeErased{7}), SpyHash(size_t{13}));
+
+ EXPECT_EQ(SpyHash(std::make_pair(TypeErased{7}, 17)),
+ SpyHash(std::make_pair(size_t{7}, 17)));
+}
+
+struct ValueWithBoolConversion {
+ operator bool() const { return false; }
+ int i;
+};
+
+} // namespace
+namespace std {
+template <>
+struct hash<ValueWithBoolConversion> {
+ size_t operator()(ValueWithBoolConversion v) { return v.i; }
+};
+} // namespace std
+
+namespace {
+
+TEST(HashTest, DoesNotUseImplicitConversionsToBool) {
+ EXPECT_NE(absl::Hash<ValueWithBoolConversion>()(ValueWithBoolConversion{0}),
+ absl::Hash<ValueWithBoolConversion>()(ValueWithBoolConversion{1}));
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/hash/hash_testing.h b/third_party/abseil/src/absl/hash/hash_testing.h
new file mode 100644
index 0000000..1e1c574
--- /dev/null
+++ b/third_party/abseil/src/absl/hash/hash_testing.h
@@ -0,0 +1,378 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_HASH_HASH_TESTING_H_
+#define ABSL_HASH_HASH_TESTING_H_
+
+#include <initializer_list>
+#include <tuple>
+#include <type_traits>
+#include <vector>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/hash/internal/spy_hash_state.h"
+#include "absl/meta/type_traits.h"
+#include "absl/strings/str_cat.h"
+#include "absl/types/variant.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+// Run the absl::Hash algorithm over all the elements passed in and verify that
+// their hash expansion is congruent with their `==` operator.
+//
+// It is used in conjunction with EXPECT_TRUE. Failures will output information
+// on what requirement failed and on which objects.
+//
+// Users should pass a collection of types as either an initializer list or a
+// container of cases.
+//
+// EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(
+// {v1, v2, ..., vN}));
+//
+// std::vector<MyType> cases;
+// // Fill cases...
+// EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(cases));
+//
+// Users can pass a variety of types for testing heterogeneous lookup with
+// `std::make_tuple`:
+//
+// EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(
+// std::make_tuple(v1, v2, ..., vN)));
+//
+//
+// Ideally, the values passed should provide enough coverage of the `==`
+// operator and the AbslHashValue implementations.
+// For dynamically sized types, the empty state should usually be included in
+// the values.
+//
+// The function accepts an optional comparator function, in case that `==` is
+// not enough for the values provided.
+//
+// Usage:
+//
+// EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(
+// std::make_tuple(v1, v2, ..., vN), MyCustomEq{}));
+//
+// It checks the following requirements:
+// 1. The expansion for a value is deterministic.
+// 2. For any two objects `a` and `b` in the sequence, if `a == b` evaluates
+// to true, then their hash expansion must be equal.
+// 3. If `a == b` evaluates to false their hash expansion must be unequal.
+// 4. If `a == b` evaluates to false neither hash expansion can be a
+// suffix of the other.
+// 5. AbslHashValue overloads should not be called by the user. They are only
+// meant to be called by the framework. Users should call H::combine() and
+// H::combine_contiguous().
+// 6. No moved-from instance of the hash state is used in the implementation
+// of AbslHashValue.
+//
+// The values do not have to have the same type. This can be useful for
+// equivalent types that support heterogeneous lookup.
+//
+// A possible reason for breaking (2) is combining state in the hash expansion
+// that was not used in `==`.
+// For example:
+//
+// struct Bad2 {
+// int a, b;
+// template <typename H>
+// friend H AbslHashValue(H state, Bad2 x) {
+// // Uses a and b.
+// return H::combine(std::move(state), x.a, x.b);
+// }
+// friend bool operator==(Bad2 x, Bad2 y) {
+// // Only uses a.
+// return x.a == y.a;
+// }
+// };
+//
+// As for (3), breaking this usually means that there is state being passed to
+// the `==` operator that is not used in the hash expansion.
+// For example:
+//
+// struct Bad3 {
+// int a, b;
+// template <typename H>
+// friend H AbslHashValue(H state, Bad3 x) {
+// // Only uses a.
+// return H::combine(std::move(state), x.a);
+// }
+// friend bool operator==(Bad3 x, Bad3 y) {
+// // Uses a and b.
+// return x.a == y.a && x.b == y.b;
+// }
+// };
+//
+// Finally, a common way to break 4 is by combining dynamic ranges without
+// combining the size of the range.
+// For example:
+//
+// struct Bad4 {
+// int *p, size;
+// template <typename H>
+// friend H AbslHashValue(H state, Bad4 x) {
+// return H::combine_contiguous(std::move(state), x.p, x.p + x.size);
+// }
+// friend bool operator==(Bad4 x, Bad4 y) {
+// // Compare two ranges for equality. C++14 code can instead use std::equal.
+// return absl::equal(x.p, x.p + x.size, y.p, y.p + y.size);
+// }
+// };
+//
+// An easy solution to this is to combine the size after combining the range,
+// like so:
+// template <typename H>
+// friend H AbslHashValue(H state, Bad4 x) {
+// return H::combine(
+// H::combine_contiguous(std::move(state), x.p, x.p + x.size), x.size);
+// }
+//
+template <int&... ExplicitBarrier, typename Container>
+ABSL_MUST_USE_RESULT testing::AssertionResult
+VerifyTypeImplementsAbslHashCorrectly(const Container& values);
+
+template <int&... ExplicitBarrier, typename Container, typename Eq>
+ABSL_MUST_USE_RESULT testing::AssertionResult
+VerifyTypeImplementsAbslHashCorrectly(const Container& values, Eq equals);
+
+template <int&..., typename T>
+ABSL_MUST_USE_RESULT testing::AssertionResult
+VerifyTypeImplementsAbslHashCorrectly(std::initializer_list<T> values);
+
+template <int&..., typename T, typename Eq>
+ABSL_MUST_USE_RESULT testing::AssertionResult
+VerifyTypeImplementsAbslHashCorrectly(std::initializer_list<T> values,
+ Eq equals);
+
+namespace hash_internal {
+
+struct PrintVisitor {
+ size_t index;
+ template <typename T>
+ std::string operator()(const T* value) const {
+ return absl::StrCat("#", index, "(", testing::PrintToString(*value), ")");
+ }
+};
+
+template <typename Eq>
+struct EqVisitor {
+ Eq eq;
+ template <typename T, typename U>
+ bool operator()(const T* t, const U* u) const {
+ return eq(*t, *u);
+ }
+};
+
+struct ExpandVisitor {
+ template <typename T>
+ SpyHashState operator()(const T* value) const {
+ return SpyHashState::combine(SpyHashState(), *value);
+ }
+};
+
+template <typename Container, typename Eq>
+ABSL_MUST_USE_RESULT testing::AssertionResult
+VerifyTypeImplementsAbslHashCorrectly(const Container& values, Eq equals) {
+ using V = typename Container::value_type;
+
+ struct Info {
+ const V& value;
+ size_t index;
+ std::string ToString() const {
+ return absl::visit(PrintVisitor{index}, value);
+ }
+ SpyHashState expand() const { return absl::visit(ExpandVisitor{}, value); }
+ };
+
+ using EqClass = std::vector<Info>;
+ std::vector<EqClass> classes;
+
+ // Gather the values in equivalence classes.
+ size_t i = 0;
+ for (const auto& value : values) {
+ EqClass* c = nullptr;
+ for (auto& eqclass : classes) {
+ if (absl::visit(EqVisitor<Eq>{equals}, value, eqclass[0].value)) {
+ c = &eqclass;
+ break;
+ }
+ }
+ if (c == nullptr) {
+ classes.emplace_back();
+ c = &classes.back();
+ }
+ c->push_back({value, i});
+ ++i;
+
+ // Verify potential errors captured by SpyHashState.
+ if (auto error = c->back().expand().error()) {
+ return testing::AssertionFailure() << *error;
+ }
+ }
+
+ if (classes.size() < 2) {
+ return testing::AssertionFailure()
+ << "At least two equivalence classes are expected.";
+ }
+
+ // We assume that equality is correctly implemented.
+ // Now we verify that AbslHashValue is also correctly implemented.
+
+ for (const auto& c : classes) {
+ // All elements of the equivalence class must have the same hash
+ // expansion.
+ const SpyHashState expected = c[0].expand();
+ for (const Info& v : c) {
+ if (v.expand() != v.expand()) {
+ return testing::AssertionFailure()
+ << "Hash expansion for " << v.ToString()
+ << " is non-deterministic.";
+ }
+ if (v.expand() != expected) {
+ return testing::AssertionFailure()
+ << "Values " << c[0].ToString() << " and " << v.ToString()
+ << " evaluate as equal but have an unequal hash expansion.";
+ }
+ }
+
+ // Elements from other classes must have different hash expansion.
+ for (const auto& c2 : classes) {
+ if (&c == &c2) continue;
+ const SpyHashState c2_hash = c2[0].expand();
+ switch (SpyHashState::Compare(expected, c2_hash)) {
+ case SpyHashState::CompareResult::kEqual:
+ return testing::AssertionFailure()
+ << "Values " << c[0].ToString() << " and " << c2[0].ToString()
+ << " evaluate as unequal but have an equal hash expansion.";
+ case SpyHashState::CompareResult::kBSuffixA:
+ return testing::AssertionFailure()
+ << "Hash expansion of " << c2[0].ToString()
+ << " is a suffix of the hash expansion of " << c[0].ToString()
+ << ".";
+ case SpyHashState::CompareResult::kASuffixB:
+ return testing::AssertionFailure()
+ << "Hash expansion of " << c[0].ToString()
+ << " is a suffix of the hash expansion of " << c2[0].ToString()
+ << ".";
+ case SpyHashState::CompareResult::kUnequal:
+ break;
+ }
+ }
+ }
+ return testing::AssertionSuccess();
+}
+
+template <typename... T>
+struct TypeSet {
+ template <typename U, bool = disjunction<std::is_same<T, U>...>::value>
+ struct Insert {
+ using type = TypeSet<U, T...>;
+ };
+ template <typename U>
+ struct Insert<U, true> {
+ using type = TypeSet;
+ };
+
+ template <template <typename...> class C>
+ using apply = C<T...>;
+};
+
+template <typename... T>
+struct MakeTypeSet : TypeSet<> {};
+template <typename T, typename... Ts>
+struct MakeTypeSet<T, Ts...> : MakeTypeSet<Ts...>::template Insert<T>::type {};
+
+template <typename... T>
+using VariantForTypes = typename MakeTypeSet<
+ const typename std::decay<T>::type*...>::template apply<absl::variant>;
+
+template <typename Container>
+struct ContainerAsVector {
+ using V = absl::variant<const typename Container::value_type*>;
+ using Out = std::vector<V>;
+
+ static Out Do(const Container& values) {
+ Out out;
+ for (const auto& v : values) out.push_back(&v);
+ return out;
+ }
+};
+
+template <typename... T>
+struct ContainerAsVector<std::tuple<T...>> {
+ using V = VariantForTypes<T...>;
+ using Out = std::vector<V>;
+
+ template <size_t... I>
+ static Out DoImpl(const std::tuple<T...>& tuple, absl::index_sequence<I...>) {
+ return Out{&std::get<I>(tuple)...};
+ }
+
+ static Out Do(const std::tuple<T...>& values) {
+ return DoImpl(values, absl::index_sequence_for<T...>());
+ }
+};
+
+template <>
+struct ContainerAsVector<std::tuple<>> {
+ static std::vector<VariantForTypes<int>> Do(std::tuple<>) { return {}; }
+};
+
+struct DefaultEquals {
+ template <typename T, typename U>
+ bool operator()(const T& t, const U& u) const {
+ return t == u;
+ }
+};
+
+} // namespace hash_internal
+
+template <int&..., typename Container>
+ABSL_MUST_USE_RESULT testing::AssertionResult
+VerifyTypeImplementsAbslHashCorrectly(const Container& values) {
+ return hash_internal::VerifyTypeImplementsAbslHashCorrectly(
+ hash_internal::ContainerAsVector<Container>::Do(values),
+ hash_internal::DefaultEquals{});
+}
+
+template <int&..., typename Container, typename Eq>
+ABSL_MUST_USE_RESULT testing::AssertionResult
+VerifyTypeImplementsAbslHashCorrectly(const Container& values, Eq equals) {
+ return hash_internal::VerifyTypeImplementsAbslHashCorrectly(
+ hash_internal::ContainerAsVector<Container>::Do(values), equals);
+}
+
+template <int&..., typename T>
+ABSL_MUST_USE_RESULT testing::AssertionResult
+VerifyTypeImplementsAbslHashCorrectly(std::initializer_list<T> values) {
+ return hash_internal::VerifyTypeImplementsAbslHashCorrectly(
+ hash_internal::ContainerAsVector<std::initializer_list<T>>::Do(values),
+ hash_internal::DefaultEquals{});
+}
+
+template <int&..., typename T, typename Eq>
+ABSL_MUST_USE_RESULT testing::AssertionResult
+VerifyTypeImplementsAbslHashCorrectly(std::initializer_list<T> values,
+ Eq equals) {
+ return hash_internal::VerifyTypeImplementsAbslHashCorrectly(
+ hash_internal::ContainerAsVector<std::initializer_list<T>>::Do(values),
+ equals);
+}
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_HASH_HASH_TESTING_H_
diff --git a/third_party/abseil/src/absl/hash/internal/city.cc b/third_party/abseil/src/absl/hash/internal/city.cc
new file mode 100644
index 0000000..5460134
--- /dev/null
+++ b/third_party/abseil/src/absl/hash/internal/city.cc
@@ -0,0 +1,349 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// This file provides CityHash64() and related functions.
+//
+// It's probably possible to create even faster hash functions by
+// writing a program that systematically explores some of the space of
+// possible hash functions, by using SIMD instructions, or by
+// compromising on hash quality.
+
+#include "absl/hash/internal/city.h"
+
+#include <string.h> // for memcpy and memset
+#include <algorithm>
+
+#include "absl/base/config.h"
+#include "absl/base/internal/endian.h"
+#include "absl/base/internal/unaligned_access.h"
+#include "absl/base/optimization.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace hash_internal {
+
+#ifdef ABSL_IS_BIG_ENDIAN
+#define uint32_in_expected_order(x) (absl::gbswap_32(x))
+#define uint64_in_expected_order(x) (absl::gbswap_64(x))
+#else
+#define uint32_in_expected_order(x) (x)
+#define uint64_in_expected_order(x) (x)
+#endif
+
+static uint64_t Fetch64(const char *p) {
+ return uint64_in_expected_order(ABSL_INTERNAL_UNALIGNED_LOAD64(p));
+}
+
+static uint32_t Fetch32(const char *p) {
+ return uint32_in_expected_order(ABSL_INTERNAL_UNALIGNED_LOAD32(p));
+}
+
+// Some primes between 2^63 and 2^64 for various uses.
+static const uint64_t k0 = 0xc3a5c85c97cb3127ULL;
+static const uint64_t k1 = 0xb492b66fbe98f273ULL;
+static const uint64_t k2 = 0x9ae16a3b2f90404fULL;
+
+// Magic numbers for 32-bit hashing. Copied from Murmur3.
+static const uint32_t c1 = 0xcc9e2d51;
+static const uint32_t c2 = 0x1b873593;
+
+// A 32-bit to 32-bit integer hash copied from Murmur3.
+static uint32_t fmix(uint32_t h) {
+ h ^= h >> 16;
+ h *= 0x85ebca6b;
+ h ^= h >> 13;
+ h *= 0xc2b2ae35;
+ h ^= h >> 16;
+ return h;
+}
+
+static uint32_t Rotate32(uint32_t val, int shift) {
+ // Avoid shifting by 32: doing so yields an undefined result.
+ return shift == 0 ? val : ((val >> shift) | (val << (32 - shift)));
+}
+
+#undef PERMUTE3
+#define PERMUTE3(a, b, c) \
+ do { \
+ std::swap(a, b); \
+ std::swap(a, c); \
+ } while (0)
+
+static uint32_t Mur(uint32_t a, uint32_t h) {
+ // Helper from Murmur3 for combining two 32-bit values.
+ a *= c1;
+ a = Rotate32(a, 17);
+ a *= c2;
+ h ^= a;
+ h = Rotate32(h, 19);
+ return h * 5 + 0xe6546b64;
+}
+
+static uint32_t Hash32Len13to24(const char *s, size_t len) {
+ uint32_t a = Fetch32(s - 4 + (len >> 1));
+ uint32_t b = Fetch32(s + 4);
+ uint32_t c = Fetch32(s + len - 8);
+ uint32_t d = Fetch32(s + (len >> 1));
+ uint32_t e = Fetch32(s);
+ uint32_t f = Fetch32(s + len - 4);
+ uint32_t h = len;
+
+ return fmix(Mur(f, Mur(e, Mur(d, Mur(c, Mur(b, Mur(a, h)))))));
+}
+
+static uint32_t Hash32Len0to4(const char *s, size_t len) {
+ uint32_t b = 0;
+ uint32_t c = 9;
+ for (size_t i = 0; i < len; i++) {
+ signed char v = s[i];
+ b = b * c1 + v;
+ c ^= b;
+ }
+ return fmix(Mur(b, Mur(len, c)));
+}
+
+static uint32_t Hash32Len5to12(const char *s, size_t len) {
+ uint32_t a = len, b = len * 5, c = 9, d = b;
+ a += Fetch32(s);
+ b += Fetch32(s + len - 4);
+ c += Fetch32(s + ((len >> 1) & 4));
+ return fmix(Mur(c, Mur(b, Mur(a, d))));
+}
+
+uint32_t CityHash32(const char *s, size_t len) {
+ if (len <= 24) {
+ return len <= 12
+ ? (len <= 4 ? Hash32Len0to4(s, len) : Hash32Len5to12(s, len))
+ : Hash32Len13to24(s, len);
+ }
+
+ // len > 24
+ uint32_t h = len, g = c1 * len, f = g;
+
+ uint32_t a0 = Rotate32(Fetch32(s + len - 4) * c1, 17) * c2;
+ uint32_t a1 = Rotate32(Fetch32(s + len - 8) * c1, 17) * c2;
+ uint32_t a2 = Rotate32(Fetch32(s + len - 16) * c1, 17) * c2;
+ uint32_t a3 = Rotate32(Fetch32(s + len - 12) * c1, 17) * c2;
+ uint32_t a4 = Rotate32(Fetch32(s + len - 20) * c1, 17) * c2;
+ h ^= a0;
+ h = Rotate32(h, 19);
+ h = h * 5 + 0xe6546b64;
+ h ^= a2;
+ h = Rotate32(h, 19);
+ h = h * 5 + 0xe6546b64;
+ g ^= a1;
+ g = Rotate32(g, 19);
+ g = g * 5 + 0xe6546b64;
+ g ^= a3;
+ g = Rotate32(g, 19);
+ g = g * 5 + 0xe6546b64;
+ f += a4;
+ f = Rotate32(f, 19);
+ f = f * 5 + 0xe6546b64;
+ size_t iters = (len - 1) / 20;
+ do {
+ uint32_t b0 = Rotate32(Fetch32(s) * c1, 17) * c2;
+ uint32_t b1 = Fetch32(s + 4);
+ uint32_t b2 = Rotate32(Fetch32(s + 8) * c1, 17) * c2;
+ uint32_t b3 = Rotate32(Fetch32(s + 12) * c1, 17) * c2;
+ uint32_t b4 = Fetch32(s + 16);
+ h ^= b0;
+ h = Rotate32(h, 18);
+ h = h * 5 + 0xe6546b64;
+ f += b1;
+ f = Rotate32(f, 19);
+ f = f * c1;
+ g += b2;
+ g = Rotate32(g, 18);
+ g = g * 5 + 0xe6546b64;
+ h ^= b3 + b1;
+ h = Rotate32(h, 19);
+ h = h * 5 + 0xe6546b64;
+ g ^= b4;
+ g = absl::gbswap_32(g) * 5;
+ h += b4 * 5;
+ h = absl::gbswap_32(h);
+ f += b0;
+ PERMUTE3(f, h, g);
+ s += 20;
+ } while (--iters != 0);
+ g = Rotate32(g, 11) * c1;
+ g = Rotate32(g, 17) * c1;
+ f = Rotate32(f, 11) * c1;
+ f = Rotate32(f, 17) * c1;
+ h = Rotate32(h + g, 19);
+ h = h * 5 + 0xe6546b64;
+ h = Rotate32(h, 17) * c1;
+ h = Rotate32(h + f, 19);
+ h = h * 5 + 0xe6546b64;
+ h = Rotate32(h, 17) * c1;
+ return h;
+}
+
+// Bitwise right rotate. Normally this will compile to a single
+// instruction, especially if the shift is a manifest constant.
+static uint64_t Rotate(uint64_t val, int shift) {
+ // Avoid shifting by 64: doing so yields an undefined result.
+ return shift == 0 ? val : ((val >> shift) | (val << (64 - shift)));
+}
+
+static uint64_t ShiftMix(uint64_t val) { return val ^ (val >> 47); }
+
+static uint64_t HashLen16(uint64_t u, uint64_t v, uint64_t mul) {
+ // Murmur-inspired hashing.
+ uint64_t a = (u ^ v) * mul;
+ a ^= (a >> 47);
+ uint64_t b = (v ^ a) * mul;
+ b ^= (b >> 47);
+ b *= mul;
+ return b;
+}
+
+static uint64_t HashLen16(uint64_t u, uint64_t v) {
+ const uint64_t kMul = 0x9ddfea08eb382d69ULL;
+ return HashLen16(u, v, kMul);
+}
+
+static uint64_t HashLen0to16(const char *s, size_t len) {
+ if (len >= 8) {
+ uint64_t mul = k2 + len * 2;
+ uint64_t a = Fetch64(s) + k2;
+ uint64_t b = Fetch64(s + len - 8);
+ uint64_t c = Rotate(b, 37) * mul + a;
+ uint64_t d = (Rotate(a, 25) + b) * mul;
+ return HashLen16(c, d, mul);
+ }
+ if (len >= 4) {
+ uint64_t mul = k2 + len * 2;
+ uint64_t a = Fetch32(s);
+ return HashLen16(len + (a << 3), Fetch32(s + len - 4), mul);
+ }
+ if (len > 0) {
+ uint8_t a = s[0];
+ uint8_t b = s[len >> 1];
+ uint8_t c = s[len - 1];
+ uint32_t y = static_cast<uint32_t>(a) + (static_cast<uint32_t>(b) << 8);
+ uint32_t z = len + (static_cast<uint32_t>(c) << 2);
+ return ShiftMix(y * k2 ^ z * k0) * k2;
+ }
+ return k2;
+}
+
+// This probably works well for 16-byte strings as well, but it may be overkill
+// in that case.
+static uint64_t HashLen17to32(const char *s, size_t len) {
+ uint64_t mul = k2 + len * 2;
+ uint64_t a = Fetch64(s) * k1;
+ uint64_t b = Fetch64(s + 8);
+ uint64_t c = Fetch64(s + len - 8) * mul;
+ uint64_t d = Fetch64(s + len - 16) * k2;
+ return HashLen16(Rotate(a + b, 43) + Rotate(c, 30) + d,
+ a + Rotate(b + k2, 18) + c, mul);
+}
+
+// Return a 16-byte hash for 48 bytes. Quick and dirty.
+// Callers do best to use "random-looking" values for a and b.
+static std::pair<uint64_t, uint64_t> WeakHashLen32WithSeeds(
+ uint64_t w, uint64_t x, uint64_t y, uint64_t z, uint64_t a, uint64_t b) {
+ a += w;
+ b = Rotate(b + a + z, 21);
+ uint64_t c = a;
+ a += x;
+ a += y;
+ b += Rotate(a, 44);
+ return std::make_pair(a + z, b + c);
+}
+
+// Return a 16-byte hash for s[0] ... s[31], a, and b. Quick and dirty.
+static std::pair<uint64_t, uint64_t> WeakHashLen32WithSeeds(const char *s,
+ uint64_t a,
+ uint64_t b) {
+ return WeakHashLen32WithSeeds(Fetch64(s), Fetch64(s + 8), Fetch64(s + 16),
+ Fetch64(s + 24), a, b);
+}
+
+// Return an 8-byte hash for 33 to 64 bytes.
+static uint64_t HashLen33to64(const char *s, size_t len) {
+ uint64_t mul = k2 + len * 2;
+ uint64_t a = Fetch64(s) * k2;
+ uint64_t b = Fetch64(s + 8);
+ uint64_t c = Fetch64(s + len - 24);
+ uint64_t d = Fetch64(s + len - 32);
+ uint64_t e = Fetch64(s + 16) * k2;
+ uint64_t f = Fetch64(s + 24) * 9;
+ uint64_t g = Fetch64(s + len - 8);
+ uint64_t h = Fetch64(s + len - 16) * mul;
+ uint64_t u = Rotate(a + g, 43) + (Rotate(b, 30) + c) * 9;
+ uint64_t v = ((a + g) ^ d) + f + 1;
+ uint64_t w = absl::gbswap_64((u + v) * mul) + h;
+ uint64_t x = Rotate(e + f, 42) + c;
+ uint64_t y = (absl::gbswap_64((v + w) * mul) + g) * mul;
+ uint64_t z = e + f + c;
+ a = absl::gbswap_64((x + z) * mul + y) + b;
+ b = ShiftMix((z + a) * mul + d + h) * mul;
+ return b + x;
+}
+
+uint64_t CityHash64(const char *s, size_t len) {
+ if (len <= 32) {
+ if (len <= 16) {
+ return HashLen0to16(s, len);
+ } else {
+ return HashLen17to32(s, len);
+ }
+ } else if (len <= 64) {
+ return HashLen33to64(s, len);
+ }
+
+ // For strings over 64 bytes we hash the end first, and then as we
+ // loop we keep 56 bytes of state: v, w, x, y, and z.
+ uint64_t x = Fetch64(s + len - 40);
+ uint64_t y = Fetch64(s + len - 16) + Fetch64(s + len - 56);
+ uint64_t z = HashLen16(Fetch64(s + len - 48) + len, Fetch64(s + len - 24));
+ std::pair<uint64_t, uint64_t> v =
+ WeakHashLen32WithSeeds(s + len - 64, len, z);
+ std::pair<uint64_t, uint64_t> w =
+ WeakHashLen32WithSeeds(s + len - 32, y + k1, x);
+ x = x * k1 + Fetch64(s);
+
+ // Decrease len to the nearest multiple of 64, and operate on 64-byte chunks.
+ len = (len - 1) & ~static_cast<size_t>(63);
+ do {
+ x = Rotate(x + y + v.first + Fetch64(s + 8), 37) * k1;
+ y = Rotate(y + v.second + Fetch64(s + 48), 42) * k1;
+ x ^= w.second;
+ y += v.first + Fetch64(s + 40);
+ z = Rotate(z + w.first, 33) * k1;
+ v = WeakHashLen32WithSeeds(s, v.second * k1, x + w.first);
+ w = WeakHashLen32WithSeeds(s + 32, z + w.second, y + Fetch64(s + 16));
+ std::swap(z, x);
+ s += 64;
+ len -= 64;
+ } while (len != 0);
+ return HashLen16(HashLen16(v.first, w.first) + ShiftMix(y) * k1 + z,
+ HashLen16(v.second, w.second) + x);
+}
+
+uint64_t CityHash64WithSeed(const char *s, size_t len, uint64_t seed) {
+ return CityHash64WithSeeds(s, len, k2, seed);
+}
+
+uint64_t CityHash64WithSeeds(const char *s, size_t len, uint64_t seed0,
+ uint64_t seed1) {
+ return HashLen16(CityHash64(s, len) - seed0, seed1);
+}
+
+} // namespace hash_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/hash/internal/city.h b/third_party/abseil/src/absl/hash/internal/city.h
new file mode 100644
index 0000000..393da0b
--- /dev/null
+++ b/third_party/abseil/src/absl/hash/internal/city.h
@@ -0,0 +1,78 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// https://code.google.com/p/cityhash/
+//
+// This file provides a few functions for hashing strings. All of them are
+// high-quality functions in the sense that they pass standard tests such
+// as Austin Appleby's SMHasher. They are also fast.
+//
+// For 64-bit x86 code, on short strings, we don't know of anything faster than
+// CityHash64 that is of comparable quality. We believe our nearest competitor
+// is Murmur3. For 64-bit x86 code, CityHash64 is an excellent choice for hash
+// tables and most other hashing (excluding cryptography).
+//
+// For 32-bit x86 code, we don't know of anything faster than CityHash32 that
+// is of comparable quality. We believe our nearest competitor is Murmur3A.
+// (On 64-bit CPUs, it is typically faster to use the other CityHash variants.)
+//
+// Functions in the CityHash family are not suitable for cryptography.
+//
+// Please see CityHash's README file for more details on our performance
+// measurements and so on.
+//
+// WARNING: This code has been only lightly tested on big-endian platforms!
+// It is known to work well on little-endian platforms that have a small penalty
+// for unaligned reads, such as current Intel and AMD moderate-to-high-end CPUs.
+// It should work on all 32-bit and 64-bit platforms that allow unaligned reads;
+// bug reports are welcome.
+//
+// By the way, for some hash functions, given strings a and b, the hash
+// of a+b is easily derived from the hashes of a and b. This property
+// doesn't hold for any hash functions in this file.
+
+#ifndef ABSL_HASH_INTERNAL_CITY_H_
+#define ABSL_HASH_INTERNAL_CITY_H_
+
+#include <stdint.h>
+#include <stdlib.h> // for size_t.
+
+#include <utility>
+
+#include "absl/base/config.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace hash_internal {
+
+// Hash function for a byte array.
+uint64_t CityHash64(const char *s, size_t len);
+
+// Hash function for a byte array. For convenience, a 64-bit seed is also
+// hashed into the result.
+uint64_t CityHash64WithSeed(const char *s, size_t len, uint64_t seed);
+
+// Hash function for a byte array. For convenience, two seeds are also
+// hashed into the result.
+uint64_t CityHash64WithSeeds(const char *s, size_t len, uint64_t seed0,
+ uint64_t seed1);
+
+// Hash function for a byte array. Most useful in 32-bit binaries.
+uint32_t CityHash32(const char *s, size_t len);
+
+} // namespace hash_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_HASH_INTERNAL_CITY_H_
diff --git a/third_party/abseil/src/absl/hash/internal/city_test.cc b/third_party/abseil/src/absl/hash/internal/city_test.cc
new file mode 100644
index 0000000..251d381
--- /dev/null
+++ b/third_party/abseil/src/absl/hash/internal/city_test.cc
@@ -0,0 +1,595 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/hash/internal/city.h"
+
+#include <string.h>
+#include <cstdio>
+#include <iostream>
+#include "gtest/gtest.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace hash_internal {
+
+static const uint64_t k0 = 0xc3a5c85c97cb3127ULL;
+static const uint64_t kSeed0 = 1234567;
+static const uint64_t kSeed1 = k0;
+static const int kDataSize = 1 << 20;
+static const int kTestSize = 300;
+
+static char data[kDataSize];
+
+// Initialize data to pseudorandom values.
+void setup() {
+ uint64_t a = 9;
+ uint64_t b = 777;
+ for (int i = 0; i < kDataSize; i++) {
+ a += b;
+ b += a;
+ a = (a ^ (a >> 41)) * k0;
+ b = (b ^ (b >> 41)) * k0 + i;
+ uint8_t u = b >> 37;
+ memcpy(data + i, &u, 1); // uint8_t -> char
+ }
+}
+
+#define C(x) 0x##x##ULL
+static const uint64_t testdata[kTestSize][4] = {
+ {C(9ae16a3b2f90404f), C(75106db890237a4a), C(3feac5f636039766),
+ C(dc56d17a)},
+ {C(541150e87f415e96), C(1aef0d24b3148a1a), C(bacc300e1e82345a),
+ C(99929334)},
+ {C(f3786a4b25827c1), C(34ee1a2bf767bd1c), C(2f15ca2ebfb631f2), C(4252edb7)},
+ {C(ef923a7a1af78eab), C(79163b1e1e9a9b18), C(df3b2aca6e1e4a30),
+ C(ebc34f3c)},
+ {C(11df592596f41d88), C(843ec0bce9042f9c), C(cce2ea1e08b1eb30),
+ C(26f2b463)},
+ {C(831f448bdc5600b3), C(62a24be3120a6919), C(1b44098a41e010da),
+ C(b042c047)},
+ {C(3eca803e70304894), C(d80de767e4a920a), C(a51cfbb292efd53d), C(e73bb0a8)},
+ {C(1b5a063fb4c7f9f1), C(318dbc24af66dee9), C(10ef7b32d5c719af),
+ C(91dfdd75)},
+ {C(a0f10149a0e538d6), C(69d008c20f87419f), C(41b36376185b3e9e),
+ C(c87f95de)},
+ {C(fb8d9c70660b910b), C(a45b0cc3476bff1b), C(b28d1996144f0207),
+ C(3f5538ef)},
+ {C(236827beae282a46), C(e43970221139c946), C(4f3ac6faa837a3aa),
+ C(70eb1a1f)},
+ {C(c385e435136ecf7c), C(d9d17368ff6c4a08), C(1b31eed4e5251a67),
+ C(cfd63b83)},
+ {C(e3f6828b6017086d), C(21b4d1900554b3b0), C(bef38be1809e24f1),
+ C(894a52ef)},
+ {C(851fff285561dca0), C(4d1277d73cdf416f), C(28ccffa61010ebe2),
+ C(9cde6a54)},
+ {C(61152a63595a96d9), C(d1a3a91ef3a7ba45), C(443b6bb4a493ad0c),
+ C(6c4898d5)},
+ {C(44473e03be306c88), C(30097761f872472a), C(9fd1b669bfad82d7),
+ C(13e1978e)},
+ {C(3ead5f21d344056), C(fb6420393cfb05c3), C(407932394cbbd303), C(51b4ba8)},
+ {C(6abbfde37ee03b5b), C(83febf188d2cc113), C(cda7b62d94d5b8ee),
+ C(b6b06e40)},
+ {C(943e7ed63b3c080), C(1ef207e9444ef7f8), C(ef4a9f9f8c6f9b4a), C(240a2f2)},
+ {C(d72ce05171ef8a1a), C(c6bd6bd869203894), C(c760e6396455d23a),
+ C(5dcefc30)},
+ {C(4182832b52d63735), C(337097e123eea414), C(b5a72ca0456df910),
+ C(7a48b105)},
+ {C(d6cdae892584a2cb), C(58de0fa4eca17dcd), C(43df30b8f5f1cb00),
+ C(fd55007b)},
+ {C(5c8e90bc267c5ee4), C(e9ae044075d992d9), C(f234cbfd1f0a1e59),
+ C(6b95894c)},
+ {C(bbd7f30ac310a6f3), C(b23b570d2666685f), C(fb13fb08c9814fe7),
+ C(3360e827)},
+ {C(36a097aa49519d97), C(8204380a73c4065), C(77c2004bdd9e276a), C(45177e0b)},
+ {C(dc78cb032c49217), C(112464083f83e03a), C(96ae53e28170c0f5), C(7c6fffe4)},
+ {C(441593e0da922dfe), C(936ef46061469b32), C(204a1921197ddd87),
+ C(bbc78da4)},
+ {C(2ba3883d71cc2133), C(72f2bbb32bed1a3c), C(27e1bd96d4843251),
+ C(c5c25d39)},
+ {C(f2b6d2adf8423600), C(7514e2f016a48722), C(43045743a50396ba),
+ C(b6e5d06e)},
+ {C(38fffe7f3680d63c), C(d513325255a7a6d1), C(31ed47790f6ca62f),
+ C(6178504e)},
+ {C(b7477bf0b9ce37c6), C(63b1c580a7fd02a4), C(f6433b9f10a5dac), C(bd4c3637)},
+ {C(55bdb0e71e3edebd), C(c7ab562bcf0568bc), C(43166332f9ee684f),
+ C(6e7ac474)},
+ {C(782fa1b08b475e7), C(fb7138951c61b23b), C(9829105e234fb11e), C(1fb4b518)},
+ {C(c5dc19b876d37a80), C(15ffcff666cfd710), C(e8c30c72003103e2),
+ C(31d13d6d)},
+ {C(5e1141711d2d6706), C(b537f6dee8de6933), C(3af0a1fbbe027c54),
+ C(26fa72e3)},
+ {C(782edf6da001234f), C(f48cbd5c66c48f3), C(808754d1e64e2a32), C(6a7433bf)},
+ {C(d26285842ff04d44), C(8f38d71341eacca9), C(5ca436f4db7a883c),
+ C(4e6df758)},
+ {C(c6ab830865a6bae6), C(6aa8e8dd4b98815c), C(efe3846713c371e5),
+ C(d57f63ea)},
+ {C(44b3a1929232892), C(61dca0e914fc217), C(a607cc142096b964), C(52ef73b3)},
+ {C(4b603d7932a8de4f), C(fae64c464b8a8f45), C(8fafab75661d602a), C(3cb36c3)},
+ {C(4ec0b54cf1566aff), C(30d2c7269b206bf4), C(77c22e82295e1061),
+ C(72c39bea)},
+ {C(ed8b7a4b34954ff7), C(56432de31f4ee757), C(85bd3abaa572b155),
+ C(a65aa25c)},
+ {C(5d28b43694176c26), C(714cc8bc12d060ae), C(3437726273a83fe6),
+ C(74740539)},
+ {C(6a1ef3639e1d202e), C(919bc1bd145ad928), C(30f3f7e48c28a773),
+ C(c3ae3c26)},
+ {C(159f4d9e0307b111), C(3e17914a5675a0c), C(af849bd425047b51), C(f29db8a2)},
+ {C(cc0a840725a7e25b), C(57c69454396e193a), C(976eaf7eee0b4540),
+ C(1ef4cbf4)},
+ {C(a2b27ee22f63c3f1), C(9ebde0ce1b3976b2), C(2fe6a92a257af308),
+ C(a9be6c41)},
+ {C(d8f2f234899bcab3), C(b10b037297c3a168), C(debea2c510ceda7f), C(fa31801)},
+ {C(584f28543864844f), C(d7cee9fc2d46f20d), C(a38dca5657387205),
+ C(8331c5d8)},
+ {C(a94be46dd9aa41af), C(a57e5b7723d3f9bd), C(34bf845a52fd2f), C(e9876db8)},
+ {C(9a87bea227491d20), C(a468657e2b9c43e7), C(af9ba60db8d89ef7),
+ C(27b0604e)},
+ {C(27688c24958d1a5c), C(e3b4a1c9429cf253), C(48a95811f70d64bc),
+ C(dcec07f2)},
+ {C(5d1d37790a1873ad), C(ed9cd4bcc5fa1090), C(ce51cde05d8cd96a),
+ C(cff0a82a)},
+ {C(1f03fd18b711eea9), C(566d89b1946d381a), C(6e96e83fc92563ab),
+ C(fec83621)},
+ {C(f0316f286cf527b6), C(f84c29538de1aa5a), C(7612ed3c923d4a71), C(743d8dc)},
+ {C(297008bcb3e3401d), C(61a8e407f82b0c69), C(a4a35bff0524fa0e),
+ C(64d41d26)},
+ {C(43c6252411ee3be), C(b4ca1b8077777168), C(2746dc3f7da1737f), C(acd90c81)},
+ {C(ce38a9a54fad6599), C(6d6f4a90b9e8755e), C(c3ecc79ff105de3f),
+ C(7c746a4b)},
+ {C(270a9305fef70cf), C(600193999d884f3a), C(f4d49eae09ed8a1), C(b1047e99)},
+ {C(e71be7c28e84d119), C(eb6ace59932736e6), C(70c4397807ba12c5),
+ C(d1fd1068)},
+ {C(b5b58c24b53aaa19), C(d2a6ab0773dd897f), C(ef762fe01ecb5b97),
+ C(56486077)},
+ {C(44dd59bd301995cf), C(3ccabd76493ada1a), C(540db4c87d55ef23),
+ C(6069be80)},
+ {C(b4d4789eb6f2630b), C(bf6973263ce8ef0e), C(d1c75c50844b9d3), C(2078359b)},
+ {C(12807833c463737c), C(58e927ea3b3776b4), C(72dd20ef1c2f8ad0),
+ C(9ea21004)},
+ {C(e88419922b87176f), C(bcf32f41a7ddbf6f), C(d6ebefd8085c1a0f),
+ C(9c9cfe88)},
+ {C(105191e0ec8f7f60), C(5918dbfcca971e79), C(6b285c8a944767b9),
+ C(b70a6ddd)},
+ {C(a5b88bf7399a9f07), C(fca3ddfd96461cc4), C(ebe738fdc0282fc6),
+ C(dea37298)},
+ {C(d08c3f5747d84f50), C(4e708b27d1b6f8ac), C(70f70fd734888606),
+ C(8f480819)},
+ {C(2f72d12a40044b4b), C(889689352fec53de), C(f03e6ad87eb2f36), C(30b3b16)},
+ {C(aa1f61fdc5c2e11e), C(c2c56cd11277ab27), C(a1e73069fdf1f94f),
+ C(f31bc4e8)},
+ {C(9489b36fe2246244), C(3355367033be74b8), C(5f57c2277cbce516),
+ C(419f953b)},
+ {C(358d7c0476a044cd), C(e0b7b47bcbd8854f), C(ffb42ec696705519),
+ C(20e9e76d)},
+ {C(b0c48df14275265a), C(9da4448975905efa), C(d716618e414ceb6d),
+ C(646f0ff8)},
+ {C(daa70bb300956588), C(410ea6883a240c6d), C(f5c8239fb5673eb3),
+ C(eeb7eca8)},
+ {C(4ec97a20b6c4c7c2), C(5913b1cd454f29fd), C(a9629f9daf06d685), C(8112bb9)},
+ {C(5c3323628435a2e8), C(1bea45ce9e72a6e3), C(904f0a7027ddb52e),
+ C(85a6d477)},
+ {C(c1ef26bea260abdb), C(6ee423f2137f9280), C(df2118b946ed0b43),
+ C(56f76c84)},
+ {C(6be7381b115d653a), C(ed046190758ea511), C(de6a45ffc3ed1159),
+ C(9af45d55)},
+ {C(ae3eece1711b2105), C(14fd3f4027f81a4a), C(abb7e45177d151db),
+ C(d1c33760)},
+ {C(376c28588b8fb389), C(6b045e84d8491ed2), C(4e857effb7d4e7dc),
+ C(c56bbf69)},
+ {C(58d943503bb6748f), C(419c6c8e88ac70f6), C(586760cbf3d3d368),
+ C(abecfb9b)},
+ {C(dfff5989f5cfd9a1), C(bcee2e7ea3a96f83), C(681c7874adb29017),
+ C(8de13255)},
+ {C(7fb19eb1a496e8f5), C(d49e5dfdb5c0833f), C(c0d5d7b2f7c48dc7),
+ C(a98ee299)},
+ {C(5dba5b0dadccdbaa), C(4ba8da8ded87fcdc), C(f693fdd25badf2f0),
+ C(3015f556)},
+ {C(688bef4b135a6829), C(8d31d82abcd54e8e), C(f95f8a30d55036d7),
+ C(5a430e29)},
+ {C(d8323be05433a412), C(8d48fa2b2b76141d), C(3d346f23978336a5),
+ C(2797add0)},
+ {C(3b5404278a55a7fc), C(23ca0b327c2d0a81), C(a6d65329571c892c),
+ C(27d55016)},
+ {C(2a96a3f96c5e9bbc), C(8caf8566e212dda8), C(904de559ca16e45e),
+ C(84945a82)},
+ {C(22bebfdcc26d18ff), C(4b4d8dcb10807ba1), C(40265eee30c6b896),
+ C(3ef7e224)},
+ {C(627a2249ec6bbcc2), C(c0578b462a46735a), C(4974b8ee1c2d4f1f),
+ C(35ed8dc8)},
+ {C(3abaf1667ba2f3e0), C(ee78476b5eeadc1), C(7e56ac0a6ca4f3f4), C(6a75e43d)},
+ {C(3931ac68c5f1b2c9), C(efe3892363ab0fb0), C(40b707268337cd36),
+ C(235d9805)},
+ {C(b98fb0606f416754), C(46a6e5547ba99c1e), C(c909d82112a8ed2), C(f7d69572)},
+ {C(7f7729a33e58fcc4), C(2e4bc1e7a023ead4), C(e707008ea7ca6222),
+ C(bacd0199)},
+ {C(42a0aa9ce82848b3), C(57232730e6bee175), C(f89bb3f370782031),
+ C(e428f50e)},
+ {C(6b2c6d38408a4889), C(de3ef6f68fb25885), C(20754f456c203361),
+ C(81eaaad3)},
+ {C(930380a3741e862a), C(348d28638dc71658), C(89dedcfd1654ea0d),
+ C(addbd3e3)},
+ {C(94808b5d2aa25f9a), C(cec72968128195e0), C(d9f4da2bdc1e130f),
+ C(e66dbca0)},
+ {C(b31abb08ae6e3d38), C(9eb9a95cbd9e8223), C(8019e79b7ee94ea9),
+ C(afe11fd5)},
+ {C(dccb5534a893ea1a), C(ce71c398708c6131), C(fe2396315457c164),
+ C(a71a406f)},
+ {C(6369163565814de6), C(8feb86fb38d08c2f), C(4976933485cc9a20),
+ C(9d90eaf5)},
+ {C(edee4ff253d9f9b3), C(96ef76fb279ef0ad), C(a4d204d179db2460),
+ C(6665db10)},
+ {C(941993df6e633214), C(929bc1beca5b72c6), C(141fc52b8d55572d),
+ C(9c977cbf)},
+ {C(859838293f64cd4c), C(484403b39d44ad79), C(bf674e64d64b9339),
+ C(ee83ddd4)},
+ {C(c19b5648e0d9f555), C(328e47b2b7562993), C(e756b92ba4bd6a51), C(26519cc)},
+ {C(f963b63b9006c248), C(9e9bf727ffaa00bc), C(c73bacc75b917e3a),
+ C(a485a53f)},
+ {C(6a8aa0852a8c1f3b), C(c8f1e5e206a21016), C(2aa554aed1ebb524),
+ C(f62bc412)},
+ {C(740428b4d45e5fb8), C(4c95a4ce922cb0a5), C(e99c3ba78feae796),
+ C(8975a436)},
+ {C(658b883b3a872b86), C(2f0e303f0f64827a), C(975337e23dc45e1), C(94ff7f41)},
+ {C(6df0a977da5d27d4), C(891dd0e7cb19508), C(fd65434a0b71e680), C(760aa031)},
+ {C(a900275464ae07ef), C(11f2cfda34beb4a3), C(9abf91e5a1c38e4), C(3bda76df)},
+ {C(810bc8aa0c40bcb0), C(448a019568d01441), C(f60ec52f60d3aeae),
+ C(498e2e65)},
+ {C(22036327deb59ed7), C(adc05ceb97026a02), C(48bff0654262672b),
+ C(d38deb48)},
+ {C(7d14dfa9772b00c8), C(595735efc7eeaed7), C(29872854f94c3507),
+ C(82b3fb6b)},
+ {C(2d777cddb912675d), C(278d7b10722a13f9), C(f5c02bfb7cc078af),
+ C(e500e25f)},
+ {C(f2ec98824e8aa613), C(5eb7e3fb53fe3bed), C(12c22860466e1dd4),
+ C(bd2bb07c)},
+ {C(5e763988e21f487f), C(24189de8065d8dc5), C(d1519d2403b62aa0),
+ C(3a2b431d)},
+ {C(48949dc327bb96ad), C(e1fd21636c5c50b4), C(3f6eb7f13a8712b4),
+ C(7322a83d)},
+ {C(b7c4209fb24a85c5), C(b35feb319c79ce10), C(f0d3de191833b922),
+ C(a645ca1c)},
+ {C(9c9e5be0943d4b05), C(b73dc69e45201cbb), C(aab17180bfe5083d),
+ C(8909a45a)},
+ {C(3898bca4dfd6638d), C(f911ff35efef0167), C(24bdf69e5091fc88),
+ C(bd30074c)},
+ {C(5b5d2557400e68e7), C(98d610033574cee), C(dfd08772ce385deb), C(c17cf001)},
+ {C(a927ed8b2bf09bb6), C(606e52f10ae94eca), C(71c2203feb35a9ee),
+ C(26ffd25a)},
+ {C(8d25746414aedf28), C(34b1629d28b33d3a), C(4d5394aea5f82d7b),
+ C(f1d8ce3c)},
+ {C(b5bbdb73458712f2), C(1ff887b3c2a35137), C(7f7231f702d0ace9),
+ C(3ee8fb17)},
+ {C(3d32a26e3ab9d254), C(fc4070574dc30d3a), C(f02629579c2b27c9),
+ C(a77acc2a)},
+ {C(9371d3c35fa5e9a5), C(42967cf4d01f30), C(652d1eeae704145c), C(f4556dee)},
+ {C(cbaa3cb8f64f54e0), C(76c3b48ee5c08417), C(9f7d24e87e61ce9), C(de287a64)},
+ {C(b2e23e8116c2ba9f), C(7e4d9c0060101151), C(3310da5e5028f367),
+ C(878e55b9)},
+ {C(8aa77f52d7868eb9), C(4d55bd587584e6e2), C(d2db37041f495f5), C(7648486)},
+ {C(858fea922c7fe0c3), C(cfe8326bf733bc6f), C(4e5e2018cf8f7dfc),
+ C(57ac0fb1)},
+ {C(46ef25fdec8392b1), C(e48d7b6d42a5cd35), C(56a6fe1c175299ca),
+ C(d01967ca)},
+ {C(8d078f726b2df464), C(b50ee71cdcabb299), C(f4af300106f9c7ba),
+ C(96ecdf74)},
+ {C(35ea86e6960ca950), C(34fe1fe234fc5c76), C(a00207a3dc2a72b7),
+ C(779f5506)},
+ {C(8aee9edbc15dd011), C(51f5839dc8462695), C(b2213e17c37dca2d),
+ C(3c94c2de)},
+ {C(c3e142ba98432dda), C(911d060cab126188), C(b753fbfa8365b844),
+ C(39f98faf)},
+ {C(123ba6b99c8cd8db), C(448e582672ee07c4), C(cebe379292db9e65),
+ C(7af31199)},
+ {C(ba87acef79d14f53), C(b3e0fcae63a11558), C(d5ac313a593a9f45),
+ C(e341a9d6)},
+ {C(bcd3957d5717dc3), C(2da746741b03a007), C(873816f4b1ece472), C(ca24aeeb)},
+ {C(61442ff55609168e), C(6447c5fc76e8c9cf), C(6a846de83ae15728),
+ C(b2252b57)},
+ {C(dbe4b1b2d174757f), C(506512da18712656), C(6857f3e0b8dd95f), C(72c81da1)},
+ {C(531e8e77b363161c), C(eece0b43e2dae030), C(8294b82c78f34ed1),
+ C(6b9fce95)},
+ {C(f71e9c926d711e2b), C(d77af2853a4ceaa1), C(9aa0d6d76a36fae7),
+ C(19399857)},
+ {C(cb20ac28f52df368), C(e6705ee7880996de), C(9b665cc3ec6972f2),
+ C(3c57a994)},
+ {C(e4a794b4acb94b55), C(89795358057b661b), C(9c4cdcec176d7a70),
+ C(c053e729)},
+ {C(cb942e91443e7208), C(e335de8125567c2a), C(d4d74d268b86df1f),
+ C(51cbbba7)},
+ {C(ecca7563c203f7ba), C(177ae2423ef34bb2), C(f60b7243400c5731),
+ C(1acde79a)},
+ {C(1652cb940177c8b5), C(8c4fe7d85d2a6d6d), C(f6216ad097e54e72),
+ C(2d160d13)},
+ {C(31fed0fc04c13ce8), C(3d5d03dbf7ff240a), C(727c5c9b51581203),
+ C(787f5801)},
+ {C(e7b668947590b9b3), C(baa41ad32938d3fa), C(abcbc8d4ca4b39e4),
+ C(c9629828)},
+ {C(1de2119923e8ef3c), C(6ab27c096cf2fe14), C(8c3658edca958891),
+ C(be139231)},
+ {C(1269df1e69e14fa7), C(992f9d58ac5041b7), C(e97fcf695a7cbbb4),
+ C(7df699ef)},
+ {C(820826d7aba567ff), C(1f73d28e036a52f3), C(41c4c5a73f3b0893),
+ C(8ce6b96d)},
+ {C(ffe0547e4923cef9), C(3534ed49b9da5b02), C(548a273700fba03d),
+ C(6f9ed99c)},
+ {C(72da8d1b11d8bc8b), C(ba94b56b91b681c6), C(4e8cc51bd9b0fc8c),
+ C(e0244796)},
+ {C(d62ab4e3f88fc797), C(ea86c7aeb6283ae4), C(b5b93e09a7fe465), C(4ccf7e75)},
+ {C(d0f06c28c7b36823), C(1008cb0874de4bb8), C(d6c7ff816c7a737b),
+ C(915cef86)},
+ {C(99b7042460d72ec6), C(2a53e5e2b8e795c2), C(53a78132d9e1b3e3),
+ C(5cb59482)},
+ {C(4f4dfcfc0ec2bae5), C(841233148268a1b8), C(9248a76ab8be0d3), C(6ca3f532)},
+ {C(fe86bf9d4422b9ae), C(ebce89c90641ef9c), C(1c84e2292c0b5659),
+ C(e24f3859)},
+ {C(a90d81060932dbb0), C(8acfaa88c5fbe92b), C(7c6f3447e90f7f3f),
+ C(adf5a9c7)},
+ {C(17938a1b0e7f5952), C(22cadd2f56f8a4be), C(84b0d1183d5ed7c1),
+ C(32264b75)},
+ {C(de9e0cb0e16f6e6d), C(238e6283aa4f6594), C(4fb9c914c2f0a13b),
+ C(a64b3376)},
+ {C(6d4b876d9b146d1a), C(aab2d64ce8f26739), C(d315f93600e83fe5), C(d33890e)},
+ {C(e698fa3f54e6ea22), C(bd28e20e7455358c), C(9ace161f6ea76e66),
+ C(926d4b63)},
+ {C(7bc0deed4fb349f7), C(1771aff25dc722fa), C(19ff0644d9681917),
+ C(d51ba539)},
+ {C(db4b15e88533f622), C(256d6d2419b41ce9), C(9d7c5378396765d5),
+ C(7f37636d)},
+ {C(922834735e86ecb2), C(363382685b88328e), C(e9c92960d7144630),
+ C(b98026c0)},
+ {C(30f1d72c812f1eb8), C(b567cd4a69cd8989), C(820b6c992a51f0bc),
+ C(b877767e)},
+ {C(168884267f3817e9), C(5b376e050f637645), C(1c18314abd34497a), C(aefae77)},
+ {C(82e78596ee3e56a7), C(25697d9c87f30d98), C(7600a8342834924d), C(f686911)},
+ {C(aa2d6cf22e3cc252), C(9b4dec4f5e179f16), C(76fb0fba1d99a99a),
+ C(3deadf12)},
+ {C(7bf5ffd7f69385c7), C(fc077b1d8bc82879), C(9c04e36f9ed83a24),
+ C(ccf02a4e)},
+ {C(e89c8ff9f9c6e34b), C(f54c0f669a49f6c4), C(fc3e46f5d846adef),
+ C(176c1722)},
+ {C(a18fbcdccd11e1f4), C(8248216751dfd65e), C(40c089f208d89d7c), C(26f82ad)},
+ {C(2d54f40cc4088b17), C(59d15633b0cd1399), C(a8cc04bb1bffd15b),
+ C(b5244f42)},
+ {C(69276946cb4e87c7), C(62bdbe6183be6fa9), C(3ba9773dac442a1a),
+ C(49a689e5)},
+ {C(668174a3f443df1d), C(407299392da1ce86), C(c2a3f7d7f2c5be28), C(59fcdd3)},
+ {C(5e29be847bd5046), C(b561c7f19c8f80c3), C(5e5abd5021ccaeaf), C(4f4b04e9)},
+ {C(cd0d79f2164da014), C(4c386bb5c5d6ca0c), C(8e771b03647c3b63),
+ C(8b00f891)},
+ {C(e0e6fc0b1628af1d), C(29be5fb4c27a2949), C(1c3f781a604d3630),
+ C(16e114f3)},
+ {C(2058927664adfd93), C(6e8f968c7963baa5), C(af3dced6fff7c394),
+ C(d6b6dadc)},
+ {C(dc107285fd8e1af7), C(a8641a0609321f3f), C(db06e89ffdc54466),
+ C(897e20ac)},
+ {C(fbba1afe2e3280f1), C(755a5f392f07fce), C(9e44a9a15402809a), C(f996e05d)},
+ {C(bfa10785ddc1011b), C(b6e1c4d2f670f7de), C(517d95604e4fcc1f),
+ C(c4306af6)},
+ {C(534cc35f0ee1eb4e), C(b703820f1f3b3dce), C(884aa164cf22363), C(6dcad433)},
+ {C(7ca6e3933995dac), C(fd118c77daa8188), C(3aceb7b5e7da6545), C(3c07374d)},
+ {C(f0d6044f6efd7598), C(e044d6ba4369856e), C(91968e4f8c8a1a4c),
+ C(f0f4602c)},
+ {C(3d69e52049879d61), C(76610636ea9f74fe), C(e9bf5602f89310c0),
+ C(3e1ea071)},
+ {C(79da242a16acae31), C(183c5f438e29d40), C(6d351710ae92f3de), C(67580f0c)},
+ {C(461c82656a74fb57), C(d84b491b275aa0f7), C(8f262cb29a6eb8b2),
+ C(4e109454)},
+ {C(53c1a66d0b13003), C(731f060e6fe797fc), C(daa56811791371e3), C(88a474a7)},
+ {C(d3a2efec0f047e9), C(1cabce58853e58ea), C(7a17b2eae3256be4), C(5b5bedd)},
+ {C(43c64d7484f7f9b2), C(5da002b64aafaeb7), C(b576c1e45800a716),
+ C(1aaddfa7)},
+ {C(a7dec6ad81cf7fa1), C(180c1ab708683063), C(95e0fd7008d67cff),
+ C(5be07fd8)},
+ {C(5408a1df99d4aff), C(b9565e588740f6bd), C(abf241813b08006e), C(cbca8606)},
+ {C(a8b27a6bcaeeed4b), C(aec1eeded6a87e39), C(9daf246d6fed8326),
+ C(bde64d01)},
+ {C(9a952a8246fdc269), C(d0dcfcac74ef278c), C(250f7139836f0f1f),
+ C(ee90cf33)},
+ {C(c930841d1d88684f), C(5eb66eb18b7f9672), C(e455d413008a2546),
+ C(4305c3ce)},
+ {C(94dc6971e3cf071a), C(994c7003b73b2b34), C(ea16e85978694e5), C(4b3a1d76)},
+ {C(7fc98006e25cac9), C(77fee0484cda86a7), C(376ec3d447060456), C(a8bb6d80)},
+ {C(bd781c4454103f6), C(612197322f49c931), C(b9cf17fd7e5462d5), C(1f9fa607)},
+ {C(da60e6b14479f9df), C(3bdccf69ece16792), C(18ebf45c4fecfdc9),
+ C(8d0e4ed2)},
+ {C(4ca56a348b6c4d3), C(60618537c3872514), C(2fbb9f0e65871b09), C(1bf31347)},
+ {C(ebd22d4b70946401), C(6863602bf7139017), C(c0b1ac4e11b00666),
+ C(1ae3fc5b)},
+ {C(3cc4693d6cbcb0c), C(501689ea1c70ffa), C(10a4353e9c89e364), C(459c3930)},
+ {C(38908e43f7ba5ef0), C(1ab035d4e7781e76), C(41d133e8c0a68ff7),
+ C(e00c4184)},
+ {C(34983ccc6aa40205), C(21802cad34e72bc4), C(1943e8fb3c17bb8), C(ffc7a781)},
+ {C(86215c45dcac9905), C(ea546afe851cae4b), C(d85b6457e489e374),
+ C(6a125480)},
+ {C(420fc255c38db175), C(d503cd0f3c1208d1), C(d4684e74c825a0bc),
+ C(88a1512b)},
+ {C(1d7a31f5bc8fe2f9), C(4763991092dcf836), C(ed695f55b97416f4),
+ C(549bbbe5)},
+ {C(94129a84c376a26e), C(c245e859dc231933), C(1b8f74fecf917453),
+ C(c133d38c)},
+ {C(1d3a9809dab05c8d), C(adddeb4f71c93e8), C(ef342eb36631edb), C(fcace348)},
+ {C(90fa3ccbd60848da), C(dfa6e0595b569e11), C(e585d067a1f5135d),
+ C(ed7b6f9a)},
+ {C(2dbb4fc71b554514), C(9650e04b86be0f82), C(60f2304fba9274d3),
+ C(6d907dda)},
+ {C(b98bf4274d18374a), C(1b669fd4c7f9a19a), C(b1f5972b88ba2b7a),
+ C(7a4d48d5)},
+ {C(d6781d0b5e18eb68), C(b992913cae09b533), C(58f6021caaee3a40),
+ C(e686f3db)},
+ {C(226651cf18f4884c), C(595052a874f0f51c), C(c9b75162b23bab42), C(cce7c55)},
+ {C(a734fb047d3162d6), C(e523170d240ba3a5), C(125a6972809730e8), C(f58b96b)},
+ {C(c6df6364a24f75a3), C(c294e2c84c4f5df8), C(a88df65c6a89313b),
+ C(1bbf6f60)},
+ {C(d8d1364c1fbcd10), C(2d7cc7f54832deaa), C(4e22c876a7c57625), C(ce5e0cc2)},
+ {C(aae06f9146db885f), C(3598736441e280d9), C(fba339b117083e55),
+ C(584cfd6f)},
+ {C(8955ef07631e3bcc), C(7d70965ea3926f83), C(39aed4134f8b2db6),
+ C(8f9bbc33)},
+ {C(ad611c609cfbe412), C(d3c00b18bf253877), C(90b2172e1f3d0bfd),
+ C(d7640d95)},
+ {C(d5339adc295d5d69), C(b633cc1dcb8b586a), C(ee84184cf5b1aeaf), C(3d12a2b)},
+ {C(40d0aeff521375a8), C(77ba1ad7ecebd506), C(547c6f1a7d9df427),
+ C(aaeafed0)},
+ {C(8b2d54ae1a3df769), C(11e7adaee3216679), C(3483781efc563e03),
+ C(95b9b814)},
+ {C(99c175819b4eae28), C(932e8ff9f7a40043), C(ec78dcab07ca9f7c),
+ C(45fbe66e)},
+ {C(2a418335779b82fc), C(af0295987849a76b), C(c12bc5ff0213f46e),
+ C(b4baa7a8)},
+ {C(3b1fc6a3d279e67d), C(70ea1e49c226396), C(25505adcf104697c), C(83e962fe)},
+ {C(d97eacdf10f1c3c9), C(b54f4654043a36e0), C(b128f6eb09d1234), C(aac3531c)},
+ {C(293a5c1c4e203cd4), C(6b3329f1c130cefe), C(f2e32f8ec76aac91),
+ C(2b1db7cc)},
+ {C(4290e018ffaedde7), C(a14948545418eb5e), C(72d851b202284636),
+ C(cf00cd31)},
+ {C(f919a59cbde8bf2f), C(a56d04203b2dc5a5), C(38b06753ac871e48),
+ C(7d3c43b8)},
+ {C(1d70a3f5521d7fa4), C(fb97b3fdc5891965), C(299d49bbbe3535af),
+ C(cbd5fac6)},
+ {C(6af98d7b656d0d7c), C(d2e99ae96d6b5c0c), C(f63bd1603ef80627),
+ C(76d0fec4)},
+ {C(395b7a8adb96ab75), C(582df7165b20f4a), C(e52bd30e9ff657f9), C(405e3402)},
+ {C(3822dd82c7df012f), C(b9029b40bd9f122b), C(fd25b988468266c4),
+ C(c732c481)},
+ {C(79f7efe4a80b951a), C(dd3a3fddfc6c9c41), C(ab4c812f9e27aa40),
+ C(a8d123c9)},
+ {C(ae6e59f5f055921a), C(e9d9b7bf68e82), C(5ce4e4a5b269cc59), C(1e80ad7d)},
+ {C(8959dbbf07387d36), C(b4658afce48ea35d), C(8f3f82437d8cb8d6),
+ C(52aeb863)},
+ {C(4739613234278a49), C(99ea5bcd340bf663), C(258640912e712b12),
+ C(ef7c0c18)},
+ {C(420e6c926bc54841), C(96dbbf6f4e7c75cd), C(d8d40fa70c3c67bb),
+ C(b6ad4b68)},
+ {C(c8601bab561bc1b7), C(72b26272a0ff869a), C(56fdfc986d6bc3c4),
+ C(c1e46b17)},
+ {C(b2d294931a0e20eb), C(284ffd9a0815bc38), C(1f8a103aac9bbe6), C(57b8df25)},
+ {C(7966f53c37b6c6d7), C(8e6abcfb3aa2b88f), C(7f2e5e0724e5f345),
+ C(e9fa36d6)},
+ {C(be9bb0abd03b7368), C(13bca93a3031be55), C(e864f4f52b55b472),
+ C(8f8daefc)},
+ {C(a08d128c5f1649be), C(a8166c3dbbe19aad), C(cb9f914f829ec62c), C(6e1bb7e)},
+ {C(7c386f0ffe0465ac), C(530419c9d843dbf3), C(7450e3a4f72b8d8c),
+ C(fd0076f0)},
+ {C(bb362094e7ef4f8), C(ff3c2a48966f9725), C(55152803acd4a7fe), C(899b17b6)},
+ {C(cd80dea24321eea4), C(52b4fdc8130c2b15), C(f3ea100b154bfb82),
+ C(e3e84e31)},
+ {C(d599a04125372c3a), C(313136c56a56f363), C(1e993c3677625832),
+ C(eef79b6b)},
+ {C(dbbf541e9dfda0a), C(1479fceb6db4f844), C(31ab576b59062534), C(868e3315)},
+ {C(c2ee3288be4fe2bf), C(c65d2f5ddf32b92), C(af6ecdf121ba5485), C(4639a426)},
+ {C(d86603ced1ed4730), C(f9de718aaada7709), C(db8b9755194c6535),
+ C(f3213646)},
+ {C(915263c671b28809), C(a815378e7ad762fd), C(abec6dc9b669f559),
+ C(17f148e9)},
+ {C(2b67cdd38c307a5e), C(cb1d45bb5c9fe1c), C(800baf2a02ec18ad), C(bfd94880)},
+ {C(2d107419073b9cd0), C(a96db0740cef8f54), C(ec41ee91b3ecdc1b),
+ C(bb1fa7f3)},
+ {C(f3e9487ec0e26dfc), C(1ab1f63224e837fa), C(119983bb5a8125d8), C(88816b1)},
+ {C(1160987c8fe86f7d), C(879e6db1481eb91b), C(d7dcb802bfe6885d),
+ C(5c2faeb3)},
+ {C(eab8112c560b967b), C(97f550b58e89dbae), C(846ed506d304051f),
+ C(51b5fc6f)},
+ {C(1addcf0386d35351), C(b5f436561f8f1484), C(85d38e22181c9bb1),
+ C(33d94752)},
+ {C(d445ba84bf803e09), C(1216c2497038f804), C(2293216ea2237207),
+ C(b0c92948)},
+ {C(37235a096a8be435), C(d9b73130493589c2), C(3b1024f59378d3be),
+ C(c7171590)},
+ {C(763ad6ea2fe1c99d), C(cf7af5368ac1e26b), C(4d5e451b3bb8d3d4),
+ C(240a67fb)},
+ {C(ea627fc84cd1b857), C(85e372494520071f), C(69ec61800845780b),
+ C(e1843cd5)},
+ {C(1f2ffd79f2cdc0c8), C(726a1bc31b337aaa), C(678b7f275ef96434),
+ C(fda1452b)},
+ {C(39a9e146ec4b3210), C(f63f75802a78b1ac), C(e2e22539c94741c3),
+ C(a2cad330)},
+ {C(74cba303e2dd9d6d), C(692699b83289fad1), C(dfb9aa7874678480),
+ C(53467e16)},
+ {C(4cbc2b73a43071e0), C(56c5db4c4ca4e0b7), C(1b275a162f46bd3d),
+ C(da14a8d0)},
+ {C(875638b9715d2221), C(d9ba0615c0c58740), C(616d4be2dfe825aa),
+ C(67333551)},
+ {C(fb686b2782994a8d), C(edee60693756bb48), C(e6bc3cae0ded2ef5),
+ C(a0ebd66e)},
+ {C(ab21d81a911e6723), C(4c31b07354852f59), C(835da384c9384744),
+ C(4b769593)},
+ {C(33d013cc0cd46ecf), C(3de726423aea122c), C(116af51117fe21a9),
+ C(6aa75624)},
+ {C(8ca92c7cd39fae5d), C(317e620e1bf20f1), C(4f0b33bf2194b97f), C(602a3f96)},
+ {C(fdde3b03f018f43e), C(38f932946c78660), C(c84084ce946851ee), C(cd183c4d)},
+ {C(9c8502050e9c9458), C(d6d2a1a69964beb9), C(1675766f480229b5),
+ C(960a4d07)},
+ {C(348176ca2fa2fdd2), C(3a89c514cc360c2d), C(9f90b8afb318d6d0),
+ C(9ae998c4)},
+ {C(4a3d3dfbbaea130b), C(4e221c920f61ed01), C(553fd6cd1304531f),
+ C(74e2179d)},
+ {C(b371f768cdf4edb9), C(bdef2ace6d2de0f0), C(e05b4100f7f1baec),
+ C(ee9bae25)},
+ {C(7a1d2e96934f61f), C(eb1760ae6af7d961), C(887eb0da063005df), C(b66edf10)},
+ {C(8be53d466d4728f2), C(86a5ac8e0d416640), C(984aa464cdb5c8bb),
+ C(d6209737)},
+ {C(829677eb03abf042), C(43cad004b6bc2c0), C(f2f224756803971a), C(b994a88)},
+ {C(754435bae3496fc), C(5707fc006f094dcf), C(8951c86ab19d8e40), C(a05d43c0)},
+ {C(fda9877ea8e3805f), C(31e868b6ffd521b7), C(b08c90681fb6a0fd),
+ C(c79f73a8)},
+ {C(2e36f523ca8f5eb5), C(8b22932f89b27513), C(331cd6ecbfadc1bb),
+ C(a490aff5)},
+ {C(21a378ef76828208), C(a5c13037fa841da2), C(506d22a53fbe9812),
+ C(dfad65b4)},
+ {C(ccdd5600054b16ca), C(f78846e84204cb7b), C(1f9faec82c24eac9), C(1d07dfb)},
+ {C(7854468f4e0cabd0), C(3a3f6b4f098d0692), C(ae2423ec7799d30d),
+ C(416df9a0)},
+ {C(7f88db5346d8f997), C(88eac9aacc653798), C(68a4d0295f8eefa1),
+ C(1f8fb9cc)},
+ {C(bb3fb5fb01d60fcf), C(1b7cc0847a215eb6), C(1246c994437990a1),
+ C(7abf48e3)},
+ {C(2e783e1761acd84d), C(39158042bac975a0), C(1cd21c5a8071188d),
+ C(dea4e3dd)},
+ {C(392058251cf22acc), C(944ec4475ead4620), C(b330a10b5cb94166),
+ C(c6064f22)},
+ {C(adf5c1e5d6419947), C(2a9747bc659d28aa), C(95c5b8cb1f5d62c), C(743bed9c)},
+ {C(6bc1db2c2bee5aba), C(e63b0ed635307398), C(7b2eca111f30dbbc),
+ C(fce254d5)},
+ {C(b00f898229efa508), C(83b7590ad7f6985c), C(2780e70a0592e41d),
+ C(e47ec9d1)},
+ {C(b56eb769ce0d9a8c), C(ce196117bfbcaf04), C(b26c3c3797d66165),
+ C(334a145c)},
+ {C(70c0637675b94150), C(259e1669305b0a15), C(46e1dd9fd387a58d),
+ C(adec1e3c)},
+ {C(74c0b8a6821faafe), C(abac39d7491370e7), C(faf0b2a48a4e6aed),
+ C(f6a9fbf8)},
+ {C(5fb5e48ac7b7fa4f), C(a96170f08f5acbc7), C(bbf5c63d4f52a1e5),
+ C(5398210c)},
+};
+
+void TestUnchanging(const uint64_t* expected, int offset, int len) {
+ EXPECT_EQ(expected[0], CityHash64(data + offset, len));
+ EXPECT_EQ(expected[3], CityHash32(data + offset, len));
+ EXPECT_EQ(expected[1], CityHash64WithSeed(data + offset, len, kSeed0));
+ EXPECT_EQ(expected[2],
+ CityHash64WithSeeds(data + offset, len, kSeed0, kSeed1));
+}
+
+TEST(CityHashTest, Unchanging) {
+ setup();
+ int i = 0;
+ for (; i < kTestSize - 1; i++) {
+ TestUnchanging(testdata[i], i * i, i);
+ }
+ TestUnchanging(testdata[i], 0, kDataSize);
+}
+
+} // namespace hash_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/hash/internal/hash.cc b/third_party/abseil/src/absl/hash/internal/hash.cc
new file mode 100644
index 0000000..b44ecb3
--- /dev/null
+++ b/third_party/abseil/src/absl/hash/internal/hash.cc
@@ -0,0 +1,55 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/hash/internal/hash.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace hash_internal {
+
+uint64_t CityHashState::CombineLargeContiguousImpl32(uint64_t state,
+ const unsigned char* first,
+ size_t len) {
+ while (len >= PiecewiseChunkSize()) {
+ state =
+ Mix(state, absl::hash_internal::CityHash32(reinterpret_cast<const char*>(first),
+ PiecewiseChunkSize()));
+ len -= PiecewiseChunkSize();
+ first += PiecewiseChunkSize();
+ }
+ // Handle the remainder.
+ return CombineContiguousImpl(state, first, len,
+ std::integral_constant<int, 4>{});
+}
+
+uint64_t CityHashState::CombineLargeContiguousImpl64(uint64_t state,
+ const unsigned char* first,
+ size_t len) {
+ while (len >= PiecewiseChunkSize()) {
+ state =
+ Mix(state, absl::hash_internal::CityHash64(reinterpret_cast<const char*>(first),
+ PiecewiseChunkSize()));
+ len -= PiecewiseChunkSize();
+ first += PiecewiseChunkSize();
+ }
+ // Handle the remainder.
+ return CombineContiguousImpl(state, first, len,
+ std::integral_constant<int, 8>{});
+}
+
+ABSL_CONST_INIT const void* const CityHashState::kSeed = &kSeed;
+
+} // namespace hash_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/hash/internal/hash.h b/third_party/abseil/src/absl/hash/internal/hash.h
new file mode 100644
index 0000000..b0132da
--- /dev/null
+++ b/third_party/abseil/src/absl/hash/internal/hash.h
@@ -0,0 +1,1003 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: hash.h
+// -----------------------------------------------------------------------------
+//
+#ifndef ABSL_HASH_INTERNAL_HASH_H_
+#define ABSL_HASH_INTERNAL_HASH_H_
+
+#include <algorithm>
+#include <array>
+#include <cmath>
+#include <cstring>
+#include <deque>
+#include <forward_list>
+#include <functional>
+#include <iterator>
+#include <limits>
+#include <list>
+#include <map>
+#include <memory>
+#include <set>
+#include <string>
+#include <tuple>
+#include <type_traits>
+#include <utility>
+#include <vector>
+
+#include "absl/base/internal/endian.h"
+#include "absl/base/port.h"
+#include "absl/container/fixed_array.h"
+#include "absl/meta/type_traits.h"
+#include "absl/numeric/int128.h"
+#include "absl/strings/string_view.h"
+#include "absl/types/optional.h"
+#include "absl/types/variant.h"
+#include "absl/utility/utility.h"
+#include "absl/hash/internal/city.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace hash_internal {
+
+// Internal detail: Large buffers are hashed in smaller chunks. This function
+// returns the size of these chunks.
+constexpr size_t PiecewiseChunkSize() { return 1024; }
+
+// PiecewiseCombiner
+//
+// PiecewiseCombiner is an internal-only helper class for hashing a piecewise
+// buffer of `char` or `unsigned char` as though it were contiguous. This class
+// provides two methods:
+//
+// H add_buffer(state, data, size)
+// H finalize(state)
+//
+// `add_buffer` can be called zero or more times, followed by a single call to
+// `finalize`. This will produce the same hash expansion as concatenating each
+// buffer piece into a single contiguous buffer, and passing this to
+// `H::combine_contiguous`.
+//
+// Example usage:
+// PiecewiseCombiner combiner;
+// for (const auto& piece : pieces) {
+// state = combiner.add_buffer(std::move(state), piece.data, piece.size);
+// }
+// return combiner.finalize(std::move(state));
+class PiecewiseCombiner {
+ public:
+ PiecewiseCombiner() : position_(0) {}
+ PiecewiseCombiner(const PiecewiseCombiner&) = delete;
+ PiecewiseCombiner& operator=(const PiecewiseCombiner&) = delete;
+
+ // PiecewiseCombiner::add_buffer()
+ //
+ // Appends the given range of bytes to the sequence to be hashed, which may
+ // modify the provided hash state.
+ template <typename H>
+ H add_buffer(H state, const unsigned char* data, size_t size);
+ template <typename H>
+ H add_buffer(H state, const char* data, size_t size) {
+ return add_buffer(std::move(state),
+ reinterpret_cast<const unsigned char*>(data), size);
+ }
+
+ // PiecewiseCombiner::finalize()
+ //
+ // Finishes combining the hash sequence, which may may modify the provided
+ // hash state.
+ //
+ // Once finalize() is called, add_buffer() may no longer be called. The
+ // resulting hash state will be the same as if the pieces passed to
+ // add_buffer() were concatenated into a single flat buffer, and then provided
+ // to H::combine_contiguous().
+ template <typename H>
+ H finalize(H state);
+
+ private:
+ unsigned char buf_[PiecewiseChunkSize()];
+ size_t position_;
+};
+
+// HashStateBase
+//
+// A hash state object represents an intermediate state in the computation
+// of an unspecified hash algorithm. `HashStateBase` provides a CRTP style
+// base class for hash state implementations. Developers adding type support
+// for `absl::Hash` should not rely on any parts of the state object other than
+// the following member functions:
+//
+// * HashStateBase::combine()
+// * HashStateBase::combine_contiguous()
+//
+// A derived hash state class of type `H` must provide a static member function
+// with a signature similar to the following:
+//
+// `static H combine_contiguous(H state, const unsigned char*, size_t)`.
+//
+// `HashStateBase` will provide a complete implementation for a hash state
+// object in terms of this method.
+//
+// Example:
+//
+// // Use CRTP to define your derived class.
+// struct MyHashState : HashStateBase<MyHashState> {
+// static H combine_contiguous(H state, const unsigned char*, size_t);
+// using MyHashState::HashStateBase::combine;
+// using MyHashState::HashStateBase::combine_contiguous;
+// };
+template <typename H>
+class HashStateBase {
+ public:
+ // HashStateBase::combine()
+ //
+ // Combines an arbitrary number of values into a hash state, returning the
+ // updated state.
+ //
+ // Each of the value types `T` must be separately hashable by the Abseil
+ // hashing framework.
+ //
+ // NOTE:
+ //
+ // state = H::combine(std::move(state), value1, value2, value3);
+ //
+ // is guaranteed to produce the same hash expansion as:
+ //
+ // state = H::combine(std::move(state), value1);
+ // state = H::combine(std::move(state), value2);
+ // state = H::combine(std::move(state), value3);
+ template <typename T, typename... Ts>
+ static H combine(H state, const T& value, const Ts&... values);
+ static H combine(H state) { return state; }
+
+ // HashStateBase::combine_contiguous()
+ //
+ // Combines a contiguous array of `size` elements into a hash state, returning
+ // the updated state.
+ //
+ // NOTE:
+ //
+ // state = H::combine_contiguous(std::move(state), data, size);
+ //
+ // is NOT guaranteed to produce the same hash expansion as a for-loop (it may
+ // perform internal optimizations). If you need this guarantee, use the
+ // for-loop instead.
+ template <typename T>
+ static H combine_contiguous(H state, const T* data, size_t size);
+
+ using AbslInternalPiecewiseCombiner = PiecewiseCombiner;
+};
+
+// is_uniquely_represented
+//
+// `is_uniquely_represented<T>` is a trait class that indicates whether `T`
+// is uniquely represented.
+//
+// A type is "uniquely represented" if two equal values of that type are
+// guaranteed to have the same bytes in their underlying storage. In other
+// words, if `a == b`, then `memcmp(&a, &b, sizeof(T))` is guaranteed to be
+// zero. This property cannot be detected automatically, so this trait is false
+// by default, but can be specialized by types that wish to assert that they are
+// uniquely represented. This makes them eligible for certain optimizations.
+//
+// If you have any doubt whatsoever, do not specialize this template.
+// The default is completely safe, and merely disables some optimizations
+// that will not matter for most types. Specializing this template,
+// on the other hand, can be very hazardous.
+//
+// To be uniquely represented, a type must not have multiple ways of
+// representing the same value; for example, float and double are not
+// uniquely represented, because they have distinct representations for
+// +0 and -0. Furthermore, the type's byte representation must consist
+// solely of user-controlled data, with no padding bits and no compiler-
+// controlled data such as vptrs or sanitizer metadata. This is usually
+// very difficult to guarantee, because in most cases the compiler can
+// insert data and padding bits at its own discretion.
+//
+// If you specialize this template for a type `T`, you must do so in the file
+// that defines that type (or in this file). If you define that specialization
+// anywhere else, `is_uniquely_represented<T>` could have different meanings
+// in different places.
+//
+// The Enable parameter is meaningless; it is provided as a convenience,
+// to support certain SFINAE techniques when defining specializations.
+template <typename T, typename Enable = void>
+struct is_uniquely_represented : std::false_type {};
+
+// is_uniquely_represented<unsigned char>
+//
+// unsigned char is a synonym for "byte", so it is guaranteed to be
+// uniquely represented.
+template <>
+struct is_uniquely_represented<unsigned char> : std::true_type {};
+
+// is_uniquely_represented for non-standard integral types
+//
+// Integral types other than bool should be uniquely represented on any
+// platform that this will plausibly be ported to.
+template <typename Integral>
+struct is_uniquely_represented<
+ Integral, typename std::enable_if<std::is_integral<Integral>::value>::type>
+ : std::true_type {};
+
+// is_uniquely_represented<bool>
+//
+//
+template <>
+struct is_uniquely_represented<bool> : std::false_type {};
+
+// hash_bytes()
+//
+// Convenience function that combines `hash_state` with the byte representation
+// of `value`.
+template <typename H, typename T>
+H hash_bytes(H hash_state, const T& value) {
+ const unsigned char* start = reinterpret_cast<const unsigned char*>(&value);
+ return H::combine_contiguous(std::move(hash_state), start, sizeof(value));
+}
+
+// -----------------------------------------------------------------------------
+// AbslHashValue for Basic Types
+// -----------------------------------------------------------------------------
+
+// Note: Default `AbslHashValue` implementations live in `hash_internal`. This
+// allows us to block lexical scope lookup when doing an unqualified call to
+// `AbslHashValue` below. User-defined implementations of `AbslHashValue` can
+// only be found via ADL.
+
+// AbslHashValue() for hashing bool values
+//
+// We use SFINAE to ensure that this overload only accepts bool, not types that
+// are convertible to bool.
+template <typename H, typename B>
+typename std::enable_if<std::is_same<B, bool>::value, H>::type AbslHashValue(
+ H hash_state, B value) {
+ return H::combine(std::move(hash_state),
+ static_cast<unsigned char>(value ? 1 : 0));
+}
+
+// AbslHashValue() for hashing enum values
+template <typename H, typename Enum>
+typename std::enable_if<std::is_enum<Enum>::value, H>::type AbslHashValue(
+ H hash_state, Enum e) {
+ // In practice, we could almost certainly just invoke hash_bytes directly,
+ // but it's possible that a sanitizer might one day want to
+ // store data in the unused bits of an enum. To avoid that risk, we
+ // convert to the underlying type before hashing. Hopefully this will get
+ // optimized away; if not, we can reopen discussion with c-toolchain-team.
+ return H::combine(std::move(hash_state),
+ static_cast<typename std::underlying_type<Enum>::type>(e));
+}
+// AbslHashValue() for hashing floating-point values
+template <typename H, typename Float>
+typename std::enable_if<std::is_same<Float, float>::value ||
+ std::is_same<Float, double>::value,
+ H>::type
+AbslHashValue(H hash_state, Float value) {
+ return hash_internal::hash_bytes(std::move(hash_state),
+ value == 0 ? 0 : value);
+}
+
+// Long double has the property that it might have extra unused bytes in it.
+// For example, in x86 sizeof(long double)==16 but it only really uses 80-bits
+// of it. This means we can't use hash_bytes on a long double and have to
+// convert it to something else first.
+template <typename H, typename LongDouble>
+typename std::enable_if<std::is_same<LongDouble, long double>::value, H>::type
+AbslHashValue(H hash_state, LongDouble value) {
+ const int category = std::fpclassify(value);
+ switch (category) {
+ case FP_INFINITE:
+ // Add the sign bit to differentiate between +Inf and -Inf
+ hash_state = H::combine(std::move(hash_state), std::signbit(value));
+ break;
+
+ case FP_NAN:
+ case FP_ZERO:
+ default:
+ // Category is enough for these.
+ break;
+
+ case FP_NORMAL:
+ case FP_SUBNORMAL:
+ // We can't convert `value` directly to double because this would have
+ // undefined behavior if the value is out of range.
+ // std::frexp gives us a value in the range (-1, -.5] or [.5, 1) that is
+ // guaranteed to be in range for `double`. The truncation is
+ // implementation defined, but that works as long as it is deterministic.
+ int exp;
+ auto mantissa = static_cast<double>(std::frexp(value, &exp));
+ hash_state = H::combine(std::move(hash_state), mantissa, exp);
+ }
+
+ return H::combine(std::move(hash_state), category);
+}
+
+// AbslHashValue() for hashing pointers
+template <typename H, typename T>
+H AbslHashValue(H hash_state, T* ptr) {
+ auto v = reinterpret_cast<uintptr_t>(ptr);
+ // Due to alignment, pointers tend to have low bits as zero, and the next few
+ // bits follow a pattern since they are also multiples of some base value.
+ // Mixing the pointer twice helps prevent stuck low bits for certain alignment
+ // values.
+ return H::combine(std::move(hash_state), v, v);
+}
+
+// AbslHashValue() for hashing nullptr_t
+template <typename H>
+H AbslHashValue(H hash_state, std::nullptr_t) {
+ return H::combine(std::move(hash_state), static_cast<void*>(nullptr));
+}
+
+// -----------------------------------------------------------------------------
+// AbslHashValue for Composite Types
+// -----------------------------------------------------------------------------
+
+// is_hashable()
+//
+// Trait class which returns true if T is hashable by the absl::Hash framework.
+// Used for the AbslHashValue implementations for composite types below.
+template <typename T>
+struct is_hashable;
+
+// AbslHashValue() for hashing pairs
+template <typename H, typename T1, typename T2>
+typename std::enable_if<is_hashable<T1>::value && is_hashable<T2>::value,
+ H>::type
+AbslHashValue(H hash_state, const std::pair<T1, T2>& p) {
+ return H::combine(std::move(hash_state), p.first, p.second);
+}
+
+// hash_tuple()
+//
+// Helper function for hashing a tuple. The third argument should
+// be an index_sequence running from 0 to tuple_size<Tuple> - 1.
+template <typename H, typename Tuple, size_t... Is>
+H hash_tuple(H hash_state, const Tuple& t, absl::index_sequence<Is...>) {
+ return H::combine(std::move(hash_state), std::get<Is>(t)...);
+}
+
+// AbslHashValue for hashing tuples
+template <typename H, typename... Ts>
+#if defined(_MSC_VER)
+// This SFINAE gets MSVC confused under some conditions. Let's just disable it
+// for now.
+H
+#else // _MSC_VER
+typename std::enable_if<absl::conjunction<is_hashable<Ts>...>::value, H>::type
+#endif // _MSC_VER
+AbslHashValue(H hash_state, const std::tuple<Ts...>& t) {
+ return hash_internal::hash_tuple(std::move(hash_state), t,
+ absl::make_index_sequence<sizeof...(Ts)>());
+}
+
+// -----------------------------------------------------------------------------
+// AbslHashValue for Pointers
+// -----------------------------------------------------------------------------
+
+// AbslHashValue for hashing unique_ptr
+template <typename H, typename T, typename D>
+H AbslHashValue(H hash_state, const std::unique_ptr<T, D>& ptr) {
+ return H::combine(std::move(hash_state), ptr.get());
+}
+
+// AbslHashValue for hashing shared_ptr
+template <typename H, typename T>
+H AbslHashValue(H hash_state, const std::shared_ptr<T>& ptr) {
+ return H::combine(std::move(hash_state), ptr.get());
+}
+
+// -----------------------------------------------------------------------------
+// AbslHashValue for String-Like Types
+// -----------------------------------------------------------------------------
+
+// AbslHashValue for hashing strings
+//
+// All the string-like types supported here provide the same hash expansion for
+// the same character sequence. These types are:
+//
+// - `absl::Cord`
+// - `std::string` (and std::basic_string<char, std::char_traits<char>, A> for
+// any allocator A)
+// - `absl::string_view` and `std::string_view`
+//
+// For simplicity, we currently support only `char` strings. This support may
+// be broadened, if necessary, but with some caution - this overload would
+// misbehave in cases where the traits' `eq()` member isn't equivalent to `==`
+// on the underlying character type.
+template <typename H>
+H AbslHashValue(H hash_state, absl::string_view str) {
+ return H::combine(
+ H::combine_contiguous(std::move(hash_state), str.data(), str.size()),
+ str.size());
+}
+
+// Support std::wstring, std::u16string and std::u32string.
+template <typename Char, typename Alloc, typename H,
+ typename = absl::enable_if_t<std::is_same<Char, wchar_t>::value ||
+ std::is_same<Char, char16_t>::value ||
+ std::is_same<Char, char32_t>::value>>
+H AbslHashValue(
+ H hash_state,
+ const std::basic_string<Char, std::char_traits<Char>, Alloc>& str) {
+ return H::combine(
+ H::combine_contiguous(std::move(hash_state), str.data(), str.size()),
+ str.size());
+}
+
+// -----------------------------------------------------------------------------
+// AbslHashValue for Sequence Containers
+// -----------------------------------------------------------------------------
+
+// AbslHashValue for hashing std::array
+template <typename H, typename T, size_t N>
+typename std::enable_if<is_hashable<T>::value, H>::type AbslHashValue(
+ H hash_state, const std::array<T, N>& array) {
+ return H::combine_contiguous(std::move(hash_state), array.data(),
+ array.size());
+}
+
+// AbslHashValue for hashing std::deque
+template <typename H, typename T, typename Allocator>
+typename std::enable_if<is_hashable<T>::value, H>::type AbslHashValue(
+ H hash_state, const std::deque<T, Allocator>& deque) {
+ // TODO(gromer): investigate a more efficient implementation taking
+ // advantage of the chunk structure.
+ for (const auto& t : deque) {
+ hash_state = H::combine(std::move(hash_state), t);
+ }
+ return H::combine(std::move(hash_state), deque.size());
+}
+
+// AbslHashValue for hashing std::forward_list
+template <typename H, typename T, typename Allocator>
+typename std::enable_if<is_hashable<T>::value, H>::type AbslHashValue(
+ H hash_state, const std::forward_list<T, Allocator>& list) {
+ size_t size = 0;
+ for (const T& t : list) {
+ hash_state = H::combine(std::move(hash_state), t);
+ ++size;
+ }
+ return H::combine(std::move(hash_state), size);
+}
+
+// AbslHashValue for hashing std::list
+template <typename H, typename T, typename Allocator>
+typename std::enable_if<is_hashable<T>::value, H>::type AbslHashValue(
+ H hash_state, const std::list<T, Allocator>& list) {
+ for (const auto& t : list) {
+ hash_state = H::combine(std::move(hash_state), t);
+ }
+ return H::combine(std::move(hash_state), list.size());
+}
+
+// AbslHashValue for hashing std::vector
+//
+// Do not use this for vector<bool>. It does not have a .data(), and a fallback
+// for std::hash<> is most likely faster.
+template <typename H, typename T, typename Allocator>
+typename std::enable_if<is_hashable<T>::value && !std::is_same<T, bool>::value,
+ H>::type
+AbslHashValue(H hash_state, const std::vector<T, Allocator>& vector) {
+ return H::combine(H::combine_contiguous(std::move(hash_state), vector.data(),
+ vector.size()),
+ vector.size());
+}
+
+// -----------------------------------------------------------------------------
+// AbslHashValue for Ordered Associative Containers
+// -----------------------------------------------------------------------------
+
+// AbslHashValue for hashing std::map
+template <typename H, typename Key, typename T, typename Compare,
+ typename Allocator>
+typename std::enable_if<is_hashable<Key>::value && is_hashable<T>::value,
+ H>::type
+AbslHashValue(H hash_state, const std::map<Key, T, Compare, Allocator>& map) {
+ for (const auto& t : map) {
+ hash_state = H::combine(std::move(hash_state), t);
+ }
+ return H::combine(std::move(hash_state), map.size());
+}
+
+// AbslHashValue for hashing std::multimap
+template <typename H, typename Key, typename T, typename Compare,
+ typename Allocator>
+typename std::enable_if<is_hashable<Key>::value && is_hashable<T>::value,
+ H>::type
+AbslHashValue(H hash_state,
+ const std::multimap<Key, T, Compare, Allocator>& map) {
+ for (const auto& t : map) {
+ hash_state = H::combine(std::move(hash_state), t);
+ }
+ return H::combine(std::move(hash_state), map.size());
+}
+
+// AbslHashValue for hashing std::set
+template <typename H, typename Key, typename Compare, typename Allocator>
+typename std::enable_if<is_hashable<Key>::value, H>::type AbslHashValue(
+ H hash_state, const std::set<Key, Compare, Allocator>& set) {
+ for (const auto& t : set) {
+ hash_state = H::combine(std::move(hash_state), t);
+ }
+ return H::combine(std::move(hash_state), set.size());
+}
+
+// AbslHashValue for hashing std::multiset
+template <typename H, typename Key, typename Compare, typename Allocator>
+typename std::enable_if<is_hashable<Key>::value, H>::type AbslHashValue(
+ H hash_state, const std::multiset<Key, Compare, Allocator>& set) {
+ for (const auto& t : set) {
+ hash_state = H::combine(std::move(hash_state), t);
+ }
+ return H::combine(std::move(hash_state), set.size());
+}
+
+// -----------------------------------------------------------------------------
+// AbslHashValue for Wrapper Types
+// -----------------------------------------------------------------------------
+
+// AbslHashValue for hashing std::reference_wrapper
+template <typename H, typename T>
+typename std::enable_if<is_hashable<T>::value, H>::type AbslHashValue(
+ H hash_state, std::reference_wrapper<T> opt) {
+ return H::combine(std::move(hash_state), opt.get());
+}
+
+// AbslHashValue for hashing absl::optional
+template <typename H, typename T>
+typename std::enable_if<is_hashable<T>::value, H>::type AbslHashValue(
+ H hash_state, const absl::optional<T>& opt) {
+ if (opt) hash_state = H::combine(std::move(hash_state), *opt);
+ return H::combine(std::move(hash_state), opt.has_value());
+}
+
+// VariantVisitor
+template <typename H>
+struct VariantVisitor {
+ H&& hash_state;
+ template <typename T>
+ H operator()(const T& t) const {
+ return H::combine(std::move(hash_state), t);
+ }
+};
+
+// AbslHashValue for hashing absl::variant
+template <typename H, typename... T>
+typename std::enable_if<conjunction<is_hashable<T>...>::value, H>::type
+AbslHashValue(H hash_state, const absl::variant<T...>& v) {
+ if (!v.valueless_by_exception()) {
+ hash_state = absl::visit(VariantVisitor<H>{std::move(hash_state)}, v);
+ }
+ return H::combine(std::move(hash_state), v.index());
+}
+
+// -----------------------------------------------------------------------------
+// AbslHashValue for Other Types
+// -----------------------------------------------------------------------------
+
+// AbslHashValue for hashing std::bitset is not defined, for the same reason as
+// for vector<bool> (see std::vector above): It does not expose the raw bytes,
+// and a fallback to std::hash<> is most likely faster.
+
+// -----------------------------------------------------------------------------
+
+// hash_range_or_bytes()
+//
+// Mixes all values in the range [data, data+size) into the hash state.
+// This overload accepts only uniquely-represented types, and hashes them by
+// hashing the entire range of bytes.
+template <typename H, typename T>
+typename std::enable_if<is_uniquely_represented<T>::value, H>::type
+hash_range_or_bytes(H hash_state, const T* data, size_t size) {
+ const auto* bytes = reinterpret_cast<const unsigned char*>(data);
+ return H::combine_contiguous(std::move(hash_state), bytes, sizeof(T) * size);
+}
+
+// hash_range_or_bytes()
+template <typename H, typename T>
+typename std::enable_if<!is_uniquely_represented<T>::value, H>::type
+hash_range_or_bytes(H hash_state, const T* data, size_t size) {
+ for (const auto end = data + size; data < end; ++data) {
+ hash_state = H::combine(std::move(hash_state), *data);
+ }
+ return hash_state;
+}
+
+#if defined(ABSL_INTERNAL_LEGACY_HASH_NAMESPACE) && \
+ ABSL_META_INTERNAL_STD_HASH_SFINAE_FRIENDLY_
+#define ABSL_HASH_INTERNAL_SUPPORT_LEGACY_HASH_ 1
+#else
+#define ABSL_HASH_INTERNAL_SUPPORT_LEGACY_HASH_ 0
+#endif
+
+// HashSelect
+//
+// Type trait to select the appropriate hash implementation to use.
+// HashSelect::type<T> will give the proper hash implementation, to be invoked
+// as:
+// HashSelect::type<T>::Invoke(state, value)
+// Also, HashSelect::type<T>::value is a boolean equal to `true` if there is a
+// valid `Invoke` function. Types that are not hashable will have a ::value of
+// `false`.
+struct HashSelect {
+ private:
+ struct State : HashStateBase<State> {
+ static State combine_contiguous(State hash_state, const unsigned char*,
+ size_t);
+ using State::HashStateBase::combine_contiguous;
+ };
+
+ struct UniquelyRepresentedProbe {
+ template <typename H, typename T>
+ static auto Invoke(H state, const T& value)
+ -> absl::enable_if_t<is_uniquely_represented<T>::value, H> {
+ return hash_internal::hash_bytes(std::move(state), value);
+ }
+ };
+
+ struct HashValueProbe {
+ template <typename H, typename T>
+ static auto Invoke(H state, const T& value) -> absl::enable_if_t<
+ std::is_same<H,
+ decltype(AbslHashValue(std::move(state), value))>::value,
+ H> {
+ return AbslHashValue(std::move(state), value);
+ }
+ };
+
+ struct LegacyHashProbe {
+#if ABSL_HASH_INTERNAL_SUPPORT_LEGACY_HASH_
+ template <typename H, typename T>
+ static auto Invoke(H state, const T& value) -> absl::enable_if_t<
+ std::is_convertible<
+ decltype(ABSL_INTERNAL_LEGACY_HASH_NAMESPACE::hash<T>()(value)),
+ size_t>::value,
+ H> {
+ return hash_internal::hash_bytes(
+ std::move(state),
+ ABSL_INTERNAL_LEGACY_HASH_NAMESPACE::hash<T>{}(value));
+ }
+#endif // ABSL_HASH_INTERNAL_SUPPORT_LEGACY_HASH_
+ };
+
+ struct StdHashProbe {
+ template <typename H, typename T>
+ static auto Invoke(H state, const T& value)
+ -> absl::enable_if_t<type_traits_internal::IsHashable<T>::value, H> {
+ return hash_internal::hash_bytes(std::move(state), std::hash<T>{}(value));
+ }
+ };
+
+ template <typename Hash, typename T>
+ struct Probe : Hash {
+ private:
+ template <typename H, typename = decltype(H::Invoke(
+ std::declval<State>(), std::declval<const T&>()))>
+ static std::true_type Test(int);
+ template <typename U>
+ static std::false_type Test(char);
+
+ public:
+ static constexpr bool value = decltype(Test<Hash>(0))::value;
+ };
+
+ public:
+ // Probe each implementation in order.
+ // disjunction provides short circuiting wrt instantiation.
+ template <typename T>
+ using Apply = absl::disjunction< //
+ Probe<UniquelyRepresentedProbe, T>, //
+ Probe<HashValueProbe, T>, //
+ Probe<LegacyHashProbe, T>, //
+ Probe<StdHashProbe, T>, //
+ std::false_type>;
+};
+
+template <typename T>
+struct is_hashable
+ : std::integral_constant<bool, HashSelect::template Apply<T>::value> {};
+
+// CityHashState
+class ABSL_DLL CityHashState
+ : public HashStateBase<CityHashState> {
+ // absl::uint128 is not an alias or a thin wrapper around the intrinsic.
+ // We use the intrinsic when available to improve performance.
+#ifdef ABSL_HAVE_INTRINSIC_INT128
+ using uint128 = __uint128_t;
+#else // ABSL_HAVE_INTRINSIC_INT128
+ using uint128 = absl::uint128;
+#endif // ABSL_HAVE_INTRINSIC_INT128
+
+ static constexpr uint64_t kMul =
+ sizeof(size_t) == 4 ? uint64_t{0xcc9e2d51}
+ : uint64_t{0x9ddfea08eb382d69};
+
+ template <typename T>
+ using IntegralFastPath =
+ conjunction<std::is_integral<T>, is_uniquely_represented<T>>;
+
+ public:
+ // Move only
+ CityHashState(CityHashState&&) = default;
+ CityHashState& operator=(CityHashState&&) = default;
+
+ // CityHashState::combine_contiguous()
+ //
+ // Fundamental base case for hash recursion: mixes the given range of bytes
+ // into the hash state.
+ static CityHashState combine_contiguous(CityHashState hash_state,
+ const unsigned char* first,
+ size_t size) {
+ return CityHashState(
+ CombineContiguousImpl(hash_state.state_, first, size,
+ std::integral_constant<int, sizeof(size_t)>{}));
+ }
+ using CityHashState::HashStateBase::combine_contiguous;
+
+ // CityHashState::hash()
+ //
+ // For performance reasons in non-opt mode, we specialize this for
+ // integral types.
+ // Otherwise we would be instantiating and calling dozens of functions for
+ // something that is just one multiplication and a couple xor's.
+ // The result should be the same as running the whole algorithm, but faster.
+ template <typename T, absl::enable_if_t<IntegralFastPath<T>::value, int> = 0>
+ static size_t hash(T value) {
+ return static_cast<size_t>(Mix(Seed(), static_cast<uint64_t>(value)));
+ }
+
+ // Overload of CityHashState::hash()
+ template <typename T, absl::enable_if_t<!IntegralFastPath<T>::value, int> = 0>
+ static size_t hash(const T& value) {
+ return static_cast<size_t>(combine(CityHashState{}, value).state_);
+ }
+
+ private:
+ // Invoked only once for a given argument; that plus the fact that this is
+ // move-only ensures that there is only one non-moved-from object.
+ CityHashState() : state_(Seed()) {}
+
+ // Workaround for MSVC bug.
+ // We make the type copyable to fix the calling convention, even though we
+ // never actually copy it. Keep it private to not affect the public API of the
+ // type.
+ CityHashState(const CityHashState&) = default;
+
+ explicit CityHashState(uint64_t state) : state_(state) {}
+
+ // Implementation of the base case for combine_contiguous where we actually
+ // mix the bytes into the state.
+ // Dispatch to different implementations of the combine_contiguous depending
+ // on the value of `sizeof(size_t)`.
+ static uint64_t CombineContiguousImpl(uint64_t state,
+ const unsigned char* first, size_t len,
+ std::integral_constant<int, 4>
+ /* sizeof_size_t */);
+ static uint64_t CombineContiguousImpl(uint64_t state,
+ const unsigned char* first, size_t len,
+ std::integral_constant<int, 8>
+ /* sizeof_size_t*/);
+
+ // Slow dispatch path for calls to CombineContiguousImpl with a size argument
+ // larger than PiecewiseChunkSize(). Has the same effect as calling
+ // CombineContiguousImpl() repeatedly with the chunk stride size.
+ static uint64_t CombineLargeContiguousImpl32(uint64_t state,
+ const unsigned char* first,
+ size_t len);
+ static uint64_t CombineLargeContiguousImpl64(uint64_t state,
+ const unsigned char* first,
+ size_t len);
+
+ // Reads 9 to 16 bytes from p.
+ // The first 8 bytes are in .first, the rest (zero padded) bytes are in
+ // .second.
+ static std::pair<uint64_t, uint64_t> Read9To16(const unsigned char* p,
+ size_t len) {
+ uint64_t high = little_endian::Load64(p + len - 8);
+ return {little_endian::Load64(p), high >> (128 - len * 8)};
+ }
+
+ // Reads 4 to 8 bytes from p. Zero pads to fill uint64_t.
+ static uint64_t Read4To8(const unsigned char* p, size_t len) {
+ return (static_cast<uint64_t>(little_endian::Load32(p + len - 4))
+ << (len - 4) * 8) |
+ little_endian::Load32(p);
+ }
+
+ // Reads 1 to 3 bytes from p. Zero pads to fill uint32_t.
+ static uint32_t Read1To3(const unsigned char* p, size_t len) {
+ return static_cast<uint32_t>((p[0]) | //
+ (p[len / 2] << (len / 2 * 8)) | //
+ (p[len - 1] << ((len - 1) * 8)));
+ }
+
+ ABSL_ATTRIBUTE_ALWAYS_INLINE static uint64_t Mix(uint64_t state, uint64_t v) {
+ using MultType =
+ absl::conditional_t<sizeof(size_t) == 4, uint64_t, uint128>;
+ // We do the addition in 64-bit space to make sure the 128-bit
+ // multiplication is fast. If we were to do it as MultType the compiler has
+ // to assume that the high word is non-zero and needs to perform 2
+ // multiplications instead of one.
+ MultType m = state + v;
+ m *= kMul;
+ return static_cast<uint64_t>(m ^ (m >> (sizeof(m) * 8 / 2)));
+ }
+
+ // Seed()
+ //
+ // A non-deterministic seed.
+ //
+ // The current purpose of this seed is to generate non-deterministic results
+ // and prevent having users depend on the particular hash values.
+ // It is not meant as a security feature right now, but it leaves the door
+ // open to upgrade it to a true per-process random seed. A true random seed
+ // costs more and we don't need to pay for that right now.
+ //
+ // On platforms with ASLR, we take advantage of it to make a per-process
+ // random value.
+ // See https://en.wikipedia.org/wiki/Address_space_layout_randomization
+ //
+ // On other platforms this is still going to be non-deterministic but most
+ // probably per-build and not per-process.
+ ABSL_ATTRIBUTE_ALWAYS_INLINE static uint64_t Seed() {
+#if (!defined(__clang__) || __clang_major__ > 11) && \
+ !defined(__apple_build_version__)
+ return static_cast<uint64_t>(reinterpret_cast<uintptr_t>(&kSeed));
+#else
+ // Workaround the absence of
+ // https://github.com/llvm/llvm-project/commit/bc15bf66dcca76cc06fe71fca35b74dc4d521021.
+ return static_cast<uint64_t>(reinterpret_cast<uintptr_t>(kSeed));
+#endif
+ }
+ static const void* const kSeed;
+
+ uint64_t state_;
+};
+
+// CityHashState::CombineContiguousImpl()
+inline uint64_t CityHashState::CombineContiguousImpl(
+ uint64_t state, const unsigned char* first, size_t len,
+ std::integral_constant<int, 4> /* sizeof_size_t */) {
+ // For large values we use CityHash, for small ones we just use a
+ // multiplicative hash.
+ uint64_t v;
+ if (len > 8) {
+ if (ABSL_PREDICT_FALSE(len > PiecewiseChunkSize())) {
+ return CombineLargeContiguousImpl32(state, first, len);
+ }
+ v = absl::hash_internal::CityHash32(reinterpret_cast<const char*>(first), len);
+ } else if (len >= 4) {
+ v = Read4To8(first, len);
+ } else if (len > 0) {
+ v = Read1To3(first, len);
+ } else {
+ // Empty ranges have no effect.
+ return state;
+ }
+ return Mix(state, v);
+}
+
+// Overload of CityHashState::CombineContiguousImpl()
+inline uint64_t CityHashState::CombineContiguousImpl(
+ uint64_t state, const unsigned char* first, size_t len,
+ std::integral_constant<int, 8> /* sizeof_size_t */) {
+ // For large values we use CityHash, for small ones we just use a
+ // multiplicative hash.
+ uint64_t v;
+ if (len > 16) {
+ if (ABSL_PREDICT_FALSE(len > PiecewiseChunkSize())) {
+ return CombineLargeContiguousImpl64(state, first, len);
+ }
+ v = absl::hash_internal::CityHash64(reinterpret_cast<const char*>(first), len);
+ } else if (len > 8) {
+ auto p = Read9To16(first, len);
+ state = Mix(state, p.first);
+ v = p.second;
+ } else if (len >= 4) {
+ v = Read4To8(first, len);
+ } else if (len > 0) {
+ v = Read1To3(first, len);
+ } else {
+ // Empty ranges have no effect.
+ return state;
+ }
+ return Mix(state, v);
+}
+
+struct AggregateBarrier {};
+
+// HashImpl
+
+// Add a private base class to make sure this type is not an aggregate.
+// Aggregates can be aggregate initialized even if the default constructor is
+// deleted.
+struct PoisonedHash : private AggregateBarrier {
+ PoisonedHash() = delete;
+ PoisonedHash(const PoisonedHash&) = delete;
+ PoisonedHash& operator=(const PoisonedHash&) = delete;
+};
+
+template <typename T>
+struct HashImpl {
+ size_t operator()(const T& value) const { return CityHashState::hash(value); }
+};
+
+template <typename T>
+struct Hash
+ : absl::conditional_t<is_hashable<T>::value, HashImpl<T>, PoisonedHash> {};
+
+template <typename H>
+template <typename T, typename... Ts>
+H HashStateBase<H>::combine(H state, const T& value, const Ts&... values) {
+ return H::combine(hash_internal::HashSelect::template Apply<T>::Invoke(
+ std::move(state), value),
+ values...);
+}
+
+// HashStateBase::combine_contiguous()
+template <typename H>
+template <typename T>
+H HashStateBase<H>::combine_contiguous(H state, const T* data, size_t size) {
+ return hash_internal::hash_range_or_bytes(std::move(state), data, size);
+}
+
+// HashStateBase::PiecewiseCombiner::add_buffer()
+template <typename H>
+H PiecewiseCombiner::add_buffer(H state, const unsigned char* data,
+ size_t size) {
+ if (position_ + size < PiecewiseChunkSize()) {
+ // This partial chunk does not fill our existing buffer
+ memcpy(buf_ + position_, data, size);
+ position_ += size;
+ return state;
+ }
+
+ // If the buffer is partially filled we need to complete the buffer
+ // and hash it.
+ if (position_ != 0) {
+ const size_t bytes_needed = PiecewiseChunkSize() - position_;
+ memcpy(buf_ + position_, data, bytes_needed);
+ state = H::combine_contiguous(std::move(state), buf_, PiecewiseChunkSize());
+ data += bytes_needed;
+ size -= bytes_needed;
+ }
+
+ // Hash whatever chunks we can without copying
+ while (size >= PiecewiseChunkSize()) {
+ state = H::combine_contiguous(std::move(state), data, PiecewiseChunkSize());
+ data += PiecewiseChunkSize();
+ size -= PiecewiseChunkSize();
+ }
+ // Fill the buffer with the remainder
+ memcpy(buf_, data, size);
+ position_ = size;
+ return state;
+}
+
+// HashStateBase::PiecewiseCombiner::finalize()
+template <typename H>
+H PiecewiseCombiner::finalize(H state) {
+ // Hash the remainder left in the buffer, which may be empty
+ return H::combine_contiguous(std::move(state), buf_, position_);
+}
+
+} // namespace hash_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_HASH_INTERNAL_HASH_H_
diff --git a/third_party/abseil/src/absl/hash/internal/print_hash_of.cc b/third_party/abseil/src/absl/hash/internal/print_hash_of.cc
new file mode 100644
index 0000000..c392125
--- /dev/null
+++ b/third_party/abseil/src/absl/hash/internal/print_hash_of.cc
@@ -0,0 +1,23 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <cstdlib>
+
+#include "absl/hash/hash.h"
+
+// Prints the hash of argv[1].
+int main(int argc, char** argv) {
+ if (argc < 2) return 1;
+ printf("%zu\n", absl::Hash<int>{}(std::atoi(argv[1]))); // NOLINT
+}
diff --git a/third_party/abseil/src/absl/hash/internal/spy_hash_state.h b/third_party/abseil/src/absl/hash/internal/spy_hash_state.h
new file mode 100644
index 0000000..c083120
--- /dev/null
+++ b/third_party/abseil/src/absl/hash/internal/spy_hash_state.h
@@ -0,0 +1,231 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_HASH_INTERNAL_SPY_HASH_STATE_H_
+#define ABSL_HASH_INTERNAL_SPY_HASH_STATE_H_
+
+#include <ostream>
+#include <string>
+#include <vector>
+
+#include "absl/hash/hash.h"
+#include "absl/strings/match.h"
+#include "absl/strings/str_format.h"
+#include "absl/strings/str_join.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace hash_internal {
+
+// SpyHashState is an implementation of the HashState API that simply
+// accumulates all input bytes in an internal buffer. This makes it useful
+// for testing AbslHashValue overloads (so long as they are templated on the
+// HashState parameter), since it can report the exact hash representation
+// that the AbslHashValue overload produces.
+//
+// Sample usage:
+// EXPECT_EQ(SpyHashState::combine(SpyHashState(), foo),
+// SpyHashState::combine(SpyHashState(), bar));
+template <typename T>
+class SpyHashStateImpl : public HashStateBase<SpyHashStateImpl<T>> {
+ public:
+ SpyHashStateImpl() : error_(std::make_shared<absl::optional<std::string>>()) {
+ static_assert(std::is_void<T>::value, "");
+ }
+
+ // Move-only
+ SpyHashStateImpl(const SpyHashStateImpl&) = delete;
+ SpyHashStateImpl& operator=(const SpyHashStateImpl&) = delete;
+
+ SpyHashStateImpl(SpyHashStateImpl&& other) noexcept {
+ *this = std::move(other);
+ }
+
+ SpyHashStateImpl& operator=(SpyHashStateImpl&& other) noexcept {
+ hash_representation_ = std::move(other.hash_representation_);
+ error_ = other.error_;
+ moved_from_ = other.moved_from_;
+ other.moved_from_ = true;
+ return *this;
+ }
+
+ template <typename U>
+ SpyHashStateImpl(SpyHashStateImpl<U>&& other) { // NOLINT
+ hash_representation_ = std::move(other.hash_representation_);
+ error_ = other.error_;
+ moved_from_ = other.moved_from_;
+ other.moved_from_ = true;
+ }
+
+ template <typename A, typename... Args>
+ static SpyHashStateImpl combine(SpyHashStateImpl s, const A& a,
+ const Args&... args) {
+ // Pass an instance of SpyHashStateImpl<A> when trying to combine `A`. This
+ // allows us to test that the user only uses this instance for combine calls
+ // and does not call AbslHashValue directly.
+ // See AbslHashValue implementation at the bottom.
+ s = SpyHashStateImpl<A>::HashStateBase::combine(std::move(s), a);
+ return SpyHashStateImpl::combine(std::move(s), args...);
+ }
+ static SpyHashStateImpl combine(SpyHashStateImpl s) {
+ if (direct_absl_hash_value_error_) {
+ *s.error_ = "AbslHashValue should not be invoked directly.";
+ } else if (s.moved_from_) {
+ *s.error_ = "Used moved-from instance of the hash state object.";
+ }
+ return s;
+ }
+
+ static void SetDirectAbslHashValueError() {
+ direct_absl_hash_value_error_ = true;
+ }
+
+ // Two SpyHashStateImpl objects are equal if they hold equal hash
+ // representations.
+ friend bool operator==(const SpyHashStateImpl& lhs,
+ const SpyHashStateImpl& rhs) {
+ return lhs.hash_representation_ == rhs.hash_representation_;
+ }
+
+ friend bool operator!=(const SpyHashStateImpl& lhs,
+ const SpyHashStateImpl& rhs) {
+ return !(lhs == rhs);
+ }
+
+ enum class CompareResult {
+ kEqual,
+ kASuffixB,
+ kBSuffixA,
+ kUnequal,
+ };
+
+ static CompareResult Compare(const SpyHashStateImpl& a,
+ const SpyHashStateImpl& b) {
+ const std::string a_flat = absl::StrJoin(a.hash_representation_, "");
+ const std::string b_flat = absl::StrJoin(b.hash_representation_, "");
+ if (a_flat == b_flat) return CompareResult::kEqual;
+ if (absl::EndsWith(a_flat, b_flat)) return CompareResult::kBSuffixA;
+ if (absl::EndsWith(b_flat, a_flat)) return CompareResult::kASuffixB;
+ return CompareResult::kUnequal;
+ }
+
+ // operator<< prints the hash representation as a hex and ASCII dump, to
+ // facilitate debugging.
+ friend std::ostream& operator<<(std::ostream& out,
+ const SpyHashStateImpl& hash_state) {
+ out << "[\n";
+ for (auto& s : hash_state.hash_representation_) {
+ size_t offset = 0;
+ for (char c : s) {
+ if (offset % 16 == 0) {
+ out << absl::StreamFormat("\n0x%04x: ", offset);
+ }
+ if (offset % 2 == 0) {
+ out << " ";
+ }
+ out << absl::StreamFormat("%02x", c);
+ ++offset;
+ }
+ out << "\n";
+ }
+ return out << "]";
+ }
+
+ // The base case of the combine recursion, which writes raw bytes into the
+ // internal buffer.
+ static SpyHashStateImpl combine_contiguous(SpyHashStateImpl hash_state,
+ const unsigned char* begin,
+ size_t size) {
+ const size_t large_chunk_stride = PiecewiseChunkSize();
+ if (size > large_chunk_stride) {
+ // Combining a large contiguous buffer must have the same effect as
+ // doing it piecewise by the stride length, followed by the (possibly
+ // empty) remainder.
+ while (size >= large_chunk_stride) {
+ hash_state = SpyHashStateImpl::combine_contiguous(
+ std::move(hash_state), begin, large_chunk_stride);
+ begin += large_chunk_stride;
+ size -= large_chunk_stride;
+ }
+ }
+
+ hash_state.hash_representation_.emplace_back(
+ reinterpret_cast<const char*>(begin), size);
+ return hash_state;
+ }
+
+ using SpyHashStateImpl::HashStateBase::combine_contiguous;
+
+ absl::optional<std::string> error() const {
+ if (moved_from_) {
+ return "Returned a moved-from instance of the hash state object.";
+ }
+ return *error_;
+ }
+
+ private:
+ template <typename U>
+ friend class SpyHashStateImpl;
+
+ // This is true if SpyHashStateImpl<T> has been passed to a call of
+ // AbslHashValue with the wrong type. This detects that the user called
+ // AbslHashValue directly (because the hash state type does not match).
+ static bool direct_absl_hash_value_error_;
+
+ std::vector<std::string> hash_representation_;
+ // This is a shared_ptr because we want all instances of the particular
+ // SpyHashState run to share the field. This way we can set the error for
+ // use-after-move and all the copies will see it.
+ std::shared_ptr<absl::optional<std::string>> error_;
+ bool moved_from_ = false;
+};
+
+template <typename T>
+bool SpyHashStateImpl<T>::direct_absl_hash_value_error_;
+
+template <bool& B>
+struct OdrUse {
+ constexpr OdrUse() {}
+ bool& b = B;
+};
+
+template <void (*)()>
+struct RunOnStartup {
+ static bool run;
+ static constexpr OdrUse<run> kOdrUse{};
+};
+
+template <void (*f)()>
+bool RunOnStartup<f>::run = (f(), true);
+
+template <
+ typename T, typename U,
+ // Only trigger for when (T != U),
+ typename = absl::enable_if_t<!std::is_same<T, U>::value>,
+ // This statement works in two ways:
+ // - First, it instantiates RunOnStartup and forces the initialization of
+ // `run`, which set the global variable.
+ // - Second, it triggers a SFINAE error disabling the overload to prevent
+ // compile time errors. If we didn't disable the overload we would get
+ // ambiguous overload errors, which we don't want.
+ int = RunOnStartup<SpyHashStateImpl<T>::SetDirectAbslHashValueError>::run>
+void AbslHashValue(SpyHashStateImpl<T>, const U&);
+
+using SpyHashState = SpyHashStateImpl<void>;
+
+} // namespace hash_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_HASH_INTERNAL_SPY_HASH_STATE_H_
diff --git a/third_party/abseil/src/absl/memory/BUILD.bazel b/third_party/abseil/src/absl/memory/BUILD.bazel
new file mode 100644
index 0000000..d2824a0
--- /dev/null
+++ b/third_party/abseil/src/absl/memory/BUILD.bazel
@@ -0,0 +1,65 @@
+#
+# Copyright 2019 The Abseil Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+load("@rules_cc//cc:defs.bzl", "cc_library", "cc_test")
+load(
+ "//absl:copts/configure_copts.bzl",
+ "ABSL_DEFAULT_COPTS",
+ "ABSL_DEFAULT_LINKOPTS",
+ "ABSL_TEST_COPTS",
+)
+
+package(default_visibility = ["//visibility:public"])
+
+licenses(["notice"])
+
+cc_library(
+ name = "memory",
+ hdrs = ["memory.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ "//absl/base:core_headers",
+ "//absl/meta:type_traits",
+ ],
+)
+
+cc_test(
+ name = "memory_test",
+ srcs = ["memory_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":memory",
+ "//absl/base:core_headers",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "memory_exception_safety_test",
+ srcs = [
+ "memory_exception_safety_test.cc",
+ ],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":memory",
+ "//absl/base:config",
+ "//absl/base:exception_safety_testing",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
diff --git a/third_party/abseil/src/absl/memory/CMakeLists.txt b/third_party/abseil/src/absl/memory/CMakeLists.txt
new file mode 100644
index 0000000..78fb7e1
--- /dev/null
+++ b/third_party/abseil/src/absl/memory/CMakeLists.txt
@@ -0,0 +1,55 @@
+#
+# Copyright 2017 The Abseil Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+absl_cc_library(
+ NAME
+ memory
+ HDRS
+ "memory.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::core_headers
+ absl::meta
+ PUBLIC
+)
+
+absl_cc_test(
+ NAME
+ memory_test
+ SRCS
+ "memory_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::memory
+ absl::core_headers
+ gmock_main
+)
+
+absl_cc_test(
+ NAME
+ memory_exception_safety_test
+ SRCS
+ "memory_exception_safety_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::memory
+ absl::config
+ absl::exception_safety_testing
+ gmock_main
+)
diff --git a/third_party/abseil/src/absl/memory/memory.h b/third_party/abseil/src/absl/memory/memory.h
new file mode 100644
index 0000000..2b5ff62
--- /dev/null
+++ b/third_party/abseil/src/absl/memory/memory.h
@@ -0,0 +1,699 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: memory.h
+// -----------------------------------------------------------------------------
+//
+// This header file contains utility functions for managing the creation and
+// conversion of smart pointers. This file is an extension to the C++
+// standard <memory> library header file.
+
+#ifndef ABSL_MEMORY_MEMORY_H_
+#define ABSL_MEMORY_MEMORY_H_
+
+#include <cstddef>
+#include <limits>
+#include <memory>
+#include <new>
+#include <type_traits>
+#include <utility>
+
+#include "absl/base/macros.h"
+#include "absl/meta/type_traits.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+// -----------------------------------------------------------------------------
+// Function Template: WrapUnique()
+// -----------------------------------------------------------------------------
+//
+// Adopts ownership from a raw pointer and transfers it to the returned
+// `std::unique_ptr`, whose type is deduced. Because of this deduction, *do not*
+// specify the template type `T` when calling `WrapUnique`.
+//
+// Example:
+// X* NewX(int, int);
+// auto x = WrapUnique(NewX(1, 2)); // 'x' is std::unique_ptr<X>.
+//
+// Do not call WrapUnique with an explicit type, as in
+// `WrapUnique<X>(NewX(1, 2))`. The purpose of WrapUnique is to automatically
+// deduce the pointer type. If you wish to make the type explicit, just use
+// `std::unique_ptr` directly.
+//
+// auto x = std::unique_ptr<X>(NewX(1, 2));
+// - or -
+// std::unique_ptr<X> x(NewX(1, 2));
+//
+// While `absl::WrapUnique` is useful for capturing the output of a raw
+// pointer factory, prefer 'absl::make_unique<T>(args...)' over
+// 'absl::WrapUnique(new T(args...))'.
+//
+// auto x = WrapUnique(new X(1, 2)); // works, but nonideal.
+// auto x = make_unique<X>(1, 2); // safer, standard, avoids raw 'new'.
+//
+// Note that `absl::WrapUnique(p)` is valid only if `delete p` is a valid
+// expression. In particular, `absl::WrapUnique()` cannot wrap pointers to
+// arrays, functions or void, and it must not be used to capture pointers
+// obtained from array-new expressions (even though that would compile!).
+template <typename T>
+std::unique_ptr<T> WrapUnique(T* ptr) {
+ static_assert(!std::is_array<T>::value, "array types are unsupported");
+ static_assert(std::is_object<T>::value, "non-object types are unsupported");
+ return std::unique_ptr<T>(ptr);
+}
+
+namespace memory_internal {
+
+// Traits to select proper overload and return type for `absl::make_unique<>`.
+template <typename T>
+struct MakeUniqueResult {
+ using scalar = std::unique_ptr<T>;
+};
+template <typename T>
+struct MakeUniqueResult<T[]> {
+ using array = std::unique_ptr<T[]>;
+};
+template <typename T, size_t N>
+struct MakeUniqueResult<T[N]> {
+ using invalid = void;
+};
+
+} // namespace memory_internal
+
+// gcc 4.8 has __cplusplus at 201301 but the libstdc++ shipped with it doesn't
+// define make_unique. Other supported compilers either just define __cplusplus
+// as 201103 but have make_unique (msvc), or have make_unique whenever
+// __cplusplus > 201103 (clang).
+#if (__cplusplus > 201103L || defined(_MSC_VER)) && \
+ !(defined(__GLIBCXX__) && !defined(__cpp_lib_make_unique))
+using std::make_unique;
+#else
+// -----------------------------------------------------------------------------
+// Function Template: make_unique<T>()
+// -----------------------------------------------------------------------------
+//
+// Creates a `std::unique_ptr<>`, while avoiding issues creating temporaries
+// during the construction process. `absl::make_unique<>` also avoids redundant
+// type declarations, by avoiding the need to explicitly use the `new` operator.
+//
+// This implementation of `absl::make_unique<>` is designed for C++11 code and
+// will be replaced in C++14 by the equivalent `std::make_unique<>` abstraction.
+// `absl::make_unique<>` is designed to be 100% compatible with
+// `std::make_unique<>` so that the eventual migration will involve a simple
+// rename operation.
+//
+// For more background on why `std::unique_ptr<T>(new T(a,b))` is problematic,
+// see Herb Sutter's explanation on
+// (Exception-Safe Function Calls)[https://herbsutter.com/gotw/_102/].
+// (In general, reviewers should treat `new T(a,b)` with scrutiny.)
+//
+// Example usage:
+//
+// auto p = make_unique<X>(args...); // 'p' is a std::unique_ptr<X>
+// auto pa = make_unique<X[]>(5); // 'pa' is a std::unique_ptr<X[]>
+//
+// Three overloads of `absl::make_unique` are required:
+//
+// - For non-array T:
+//
+// Allocates a T with `new T(std::forward<Args> args...)`,
+// forwarding all `args` to T's constructor.
+// Returns a `std::unique_ptr<T>` owning that object.
+//
+// - For an array of unknown bounds T[]:
+//
+// `absl::make_unique<>` will allocate an array T of type U[] with
+// `new U[n]()` and return a `std::unique_ptr<U[]>` owning that array.
+//
+// Note that 'U[n]()' is different from 'U[n]', and elements will be
+// value-initialized. Note as well that `std::unique_ptr` will perform its
+// own destruction of the array elements upon leaving scope, even though
+// the array [] does not have a default destructor.
+//
+// NOTE: an array of unknown bounds T[] may still be (and often will be)
+// initialized to have a size, and will still use this overload. E.g:
+//
+// auto my_array = absl::make_unique<int[]>(10);
+//
+// - For an array of known bounds T[N]:
+//
+// `absl::make_unique<>` is deleted (like with `std::make_unique<>`) as
+// this overload is not useful.
+//
+// NOTE: an array of known bounds T[N] is not considered a useful
+// construction, and may cause undefined behavior in templates. E.g:
+//
+// auto my_array = absl::make_unique<int[10]>();
+//
+// In those cases, of course, you can still use the overload above and
+// simply initialize it to its desired size:
+//
+// auto my_array = absl::make_unique<int[]>(10);
+
+// `absl::make_unique` overload for non-array types.
+template <typename T, typename... Args>
+typename memory_internal::MakeUniqueResult<T>::scalar make_unique(
+ Args&&... args) {
+ return std::unique_ptr<T>(new T(std::forward<Args>(args)...));
+}
+
+// `absl::make_unique` overload for an array T[] of unknown bounds.
+// The array allocation needs to use the `new T[size]` form and cannot take
+// element constructor arguments. The `std::unique_ptr` will manage destructing
+// these array elements.
+template <typename T>
+typename memory_internal::MakeUniqueResult<T>::array make_unique(size_t n) {
+ return std::unique_ptr<T>(new typename absl::remove_extent_t<T>[n]());
+}
+
+// `absl::make_unique` overload for an array T[N] of known bounds.
+// This construction will be rejected.
+template <typename T, typename... Args>
+typename memory_internal::MakeUniqueResult<T>::invalid make_unique(
+ Args&&... /* args */) = delete;
+#endif
+
+// -----------------------------------------------------------------------------
+// Function Template: RawPtr()
+// -----------------------------------------------------------------------------
+//
+// Extracts the raw pointer from a pointer-like value `ptr`. `absl::RawPtr` is
+// useful within templates that need to handle a complement of raw pointers,
+// `std::nullptr_t`, and smart pointers.
+template <typename T>
+auto RawPtr(T&& ptr) -> decltype(std::addressof(*ptr)) {
+ // ptr is a forwarding reference to support Ts with non-const operators.
+ return (ptr != nullptr) ? std::addressof(*ptr) : nullptr;
+}
+inline std::nullptr_t RawPtr(std::nullptr_t) { return nullptr; }
+
+// -----------------------------------------------------------------------------
+// Function Template: ShareUniquePtr()
+// -----------------------------------------------------------------------------
+//
+// Adopts a `std::unique_ptr` rvalue and returns a `std::shared_ptr` of deduced
+// type. Ownership (if any) of the held value is transferred to the returned
+// shared pointer.
+//
+// Example:
+//
+// auto up = absl::make_unique<int>(10);
+// auto sp = absl::ShareUniquePtr(std::move(up)); // shared_ptr<int>
+// CHECK_EQ(*sp, 10);
+// CHECK(up == nullptr);
+//
+// Note that this conversion is correct even when T is an array type, and more
+// generally it works for *any* deleter of the `unique_ptr` (single-object
+// deleter, array deleter, or any custom deleter), since the deleter is adopted
+// by the shared pointer as well. The deleter is copied (unless it is a
+// reference).
+//
+// Implements the resolution of [LWG 2415](http://wg21.link/lwg2415), by which a
+// null shared pointer does not attempt to call the deleter.
+template <typename T, typename D>
+std::shared_ptr<T> ShareUniquePtr(std::unique_ptr<T, D>&& ptr) {
+ return ptr ? std::shared_ptr<T>(std::move(ptr)) : std::shared_ptr<T>();
+}
+
+// -----------------------------------------------------------------------------
+// Function Template: WeakenPtr()
+// -----------------------------------------------------------------------------
+//
+// Creates a weak pointer associated with a given shared pointer. The returned
+// value is a `std::weak_ptr` of deduced type.
+//
+// Example:
+//
+// auto sp = std::make_shared<int>(10);
+// auto wp = absl::WeakenPtr(sp);
+// CHECK_EQ(sp.get(), wp.lock().get());
+// sp.reset();
+// CHECK(wp.lock() == nullptr);
+//
+template <typename T>
+std::weak_ptr<T> WeakenPtr(const std::shared_ptr<T>& ptr) {
+ return std::weak_ptr<T>(ptr);
+}
+
+namespace memory_internal {
+
+// ExtractOr<E, O, D>::type evaluates to E<O> if possible. Otherwise, D.
+template <template <typename> class Extract, typename Obj, typename Default,
+ typename>
+struct ExtractOr {
+ using type = Default;
+};
+
+template <template <typename> class Extract, typename Obj, typename Default>
+struct ExtractOr<Extract, Obj, Default, void_t<Extract<Obj>>> {
+ using type = Extract<Obj>;
+};
+
+template <template <typename> class Extract, typename Obj, typename Default>
+using ExtractOrT = typename ExtractOr<Extract, Obj, Default, void>::type;
+
+// Extractors for the features of allocators.
+template <typename T>
+using GetPointer = typename T::pointer;
+
+template <typename T>
+using GetConstPointer = typename T::const_pointer;
+
+template <typename T>
+using GetVoidPointer = typename T::void_pointer;
+
+template <typename T>
+using GetConstVoidPointer = typename T::const_void_pointer;
+
+template <typename T>
+using GetDifferenceType = typename T::difference_type;
+
+template <typename T>
+using GetSizeType = typename T::size_type;
+
+template <typename T>
+using GetPropagateOnContainerCopyAssignment =
+ typename T::propagate_on_container_copy_assignment;
+
+template <typename T>
+using GetPropagateOnContainerMoveAssignment =
+ typename T::propagate_on_container_move_assignment;
+
+template <typename T>
+using GetPropagateOnContainerSwap = typename T::propagate_on_container_swap;
+
+template <typename T>
+using GetIsAlwaysEqual = typename T::is_always_equal;
+
+template <typename T>
+struct GetFirstArg;
+
+template <template <typename...> class Class, typename T, typename... Args>
+struct GetFirstArg<Class<T, Args...>> {
+ using type = T;
+};
+
+template <typename Ptr, typename = void>
+struct ElementType {
+ using type = typename GetFirstArg<Ptr>::type;
+};
+
+template <typename T>
+struct ElementType<T, void_t<typename T::element_type>> {
+ using type = typename T::element_type;
+};
+
+template <typename T, typename U>
+struct RebindFirstArg;
+
+template <template <typename...> class Class, typename T, typename... Args,
+ typename U>
+struct RebindFirstArg<Class<T, Args...>, U> {
+ using type = Class<U, Args...>;
+};
+
+template <typename T, typename U, typename = void>
+struct RebindPtr {
+ using type = typename RebindFirstArg<T, U>::type;
+};
+
+template <typename T, typename U>
+struct RebindPtr<T, U, void_t<typename T::template rebind<U>>> {
+ using type = typename T::template rebind<U>;
+};
+
+template <typename T, typename U>
+constexpr bool HasRebindAlloc(...) {
+ return false;
+}
+
+template <typename T, typename U>
+constexpr bool HasRebindAlloc(typename T::template rebind<U>::other*) {
+ return true;
+}
+
+template <typename T, typename U, bool = HasRebindAlloc<T, U>(nullptr)>
+struct RebindAlloc {
+ using type = typename RebindFirstArg<T, U>::type;
+};
+
+template <typename T, typename U>
+struct RebindAlloc<T, U, true> {
+ using type = typename T::template rebind<U>::other;
+};
+
+} // namespace memory_internal
+
+// -----------------------------------------------------------------------------
+// Class Template: pointer_traits
+// -----------------------------------------------------------------------------
+//
+// An implementation of C++11's std::pointer_traits.
+//
+// Provided for portability on toolchains that have a working C++11 compiler,
+// but the standard library is lacking in C++11 support. For example, some
+// version of the Android NDK.
+//
+
+template <typename Ptr>
+struct pointer_traits {
+ using pointer = Ptr;
+
+ // element_type:
+ // Ptr::element_type if present. Otherwise T if Ptr is a template
+ // instantiation Template<T, Args...>
+ using element_type = typename memory_internal::ElementType<Ptr>::type;
+
+ // difference_type:
+ // Ptr::difference_type if present, otherwise std::ptrdiff_t
+ using difference_type =
+ memory_internal::ExtractOrT<memory_internal::GetDifferenceType, Ptr,
+ std::ptrdiff_t>;
+
+ // rebind:
+ // Ptr::rebind<U> if exists, otherwise Template<U, Args...> if Ptr is a
+ // template instantiation Template<T, Args...>
+ template <typename U>
+ using rebind = typename memory_internal::RebindPtr<Ptr, U>::type;
+
+ // pointer_to:
+ // Calls Ptr::pointer_to(r)
+ static pointer pointer_to(element_type& r) { // NOLINT(runtime/references)
+ return Ptr::pointer_to(r);
+ }
+};
+
+// Specialization for T*.
+template <typename T>
+struct pointer_traits<T*> {
+ using pointer = T*;
+ using element_type = T;
+ using difference_type = std::ptrdiff_t;
+
+ template <typename U>
+ using rebind = U*;
+
+ // pointer_to:
+ // Calls std::addressof(r)
+ static pointer pointer_to(
+ element_type& r) noexcept { // NOLINT(runtime/references)
+ return std::addressof(r);
+ }
+};
+
+// -----------------------------------------------------------------------------
+// Class Template: allocator_traits
+// -----------------------------------------------------------------------------
+//
+// A C++11 compatible implementation of C++17's std::allocator_traits.
+//
+#if __cplusplus >= 201703L
+using std::allocator_traits;
+#else // __cplusplus >= 201703L
+template <typename Alloc>
+struct allocator_traits {
+ using allocator_type = Alloc;
+
+ // value_type:
+ // Alloc::value_type
+ using value_type = typename Alloc::value_type;
+
+ // pointer:
+ // Alloc::pointer if present, otherwise value_type*
+ using pointer = memory_internal::ExtractOrT<memory_internal::GetPointer,
+ Alloc, value_type*>;
+
+ // const_pointer:
+ // Alloc::const_pointer if present, otherwise
+ // absl::pointer_traits<pointer>::rebind<const value_type>
+ using const_pointer =
+ memory_internal::ExtractOrT<memory_internal::GetConstPointer, Alloc,
+ typename absl::pointer_traits<pointer>::
+ template rebind<const value_type>>;
+
+ // void_pointer:
+ // Alloc::void_pointer if present, otherwise
+ // absl::pointer_traits<pointer>::rebind<void>
+ using void_pointer = memory_internal::ExtractOrT<
+ memory_internal::GetVoidPointer, Alloc,
+ typename absl::pointer_traits<pointer>::template rebind<void>>;
+
+ // const_void_pointer:
+ // Alloc::const_void_pointer if present, otherwise
+ // absl::pointer_traits<pointer>::rebind<const void>
+ using const_void_pointer = memory_internal::ExtractOrT<
+ memory_internal::GetConstVoidPointer, Alloc,
+ typename absl::pointer_traits<pointer>::template rebind<const void>>;
+
+ // difference_type:
+ // Alloc::difference_type if present, otherwise
+ // absl::pointer_traits<pointer>::difference_type
+ using difference_type = memory_internal::ExtractOrT<
+ memory_internal::GetDifferenceType, Alloc,
+ typename absl::pointer_traits<pointer>::difference_type>;
+
+ // size_type:
+ // Alloc::size_type if present, otherwise
+ // std::make_unsigned<difference_type>::type
+ using size_type = memory_internal::ExtractOrT<
+ memory_internal::GetSizeType, Alloc,
+ typename std::make_unsigned<difference_type>::type>;
+
+ // propagate_on_container_copy_assignment:
+ // Alloc::propagate_on_container_copy_assignment if present, otherwise
+ // std::false_type
+ using propagate_on_container_copy_assignment = memory_internal::ExtractOrT<
+ memory_internal::GetPropagateOnContainerCopyAssignment, Alloc,
+ std::false_type>;
+
+ // propagate_on_container_move_assignment:
+ // Alloc::propagate_on_container_move_assignment if present, otherwise
+ // std::false_type
+ using propagate_on_container_move_assignment = memory_internal::ExtractOrT<
+ memory_internal::GetPropagateOnContainerMoveAssignment, Alloc,
+ std::false_type>;
+
+ // propagate_on_container_swap:
+ // Alloc::propagate_on_container_swap if present, otherwise std::false_type
+ using propagate_on_container_swap =
+ memory_internal::ExtractOrT<memory_internal::GetPropagateOnContainerSwap,
+ Alloc, std::false_type>;
+
+ // is_always_equal:
+ // Alloc::is_always_equal if present, otherwise std::is_empty<Alloc>::type
+ using is_always_equal =
+ memory_internal::ExtractOrT<memory_internal::GetIsAlwaysEqual, Alloc,
+ typename std::is_empty<Alloc>::type>;
+
+ // rebind_alloc:
+ // Alloc::rebind<T>::other if present, otherwise Alloc<T, Args> if this Alloc
+ // is Alloc<U, Args>
+ template <typename T>
+ using rebind_alloc = typename memory_internal::RebindAlloc<Alloc, T>::type;
+
+ // rebind_traits:
+ // absl::allocator_traits<rebind_alloc<T>>
+ template <typename T>
+ using rebind_traits = absl::allocator_traits<rebind_alloc<T>>;
+
+ // allocate(Alloc& a, size_type n):
+ // Calls a.allocate(n)
+ static pointer allocate(Alloc& a, // NOLINT(runtime/references)
+ size_type n) {
+ return a.allocate(n);
+ }
+
+ // allocate(Alloc& a, size_type n, const_void_pointer hint):
+ // Calls a.allocate(n, hint) if possible.
+ // If not possible, calls a.allocate(n)
+ static pointer allocate(Alloc& a, size_type n, // NOLINT(runtime/references)
+ const_void_pointer hint) {
+ return allocate_impl(0, a, n, hint);
+ }
+
+ // deallocate(Alloc& a, pointer p, size_type n):
+ // Calls a.deallocate(p, n)
+ static void deallocate(Alloc& a, pointer p, // NOLINT(runtime/references)
+ size_type n) {
+ a.deallocate(p, n);
+ }
+
+ // construct(Alloc& a, T* p, Args&&... args):
+ // Calls a.construct(p, std::forward<Args>(args)...) if possible.
+ // If not possible, calls
+ // ::new (static_cast<void*>(p)) T(std::forward<Args>(args)...)
+ template <typename T, typename... Args>
+ static void construct(Alloc& a, T* p, // NOLINT(runtime/references)
+ Args&&... args) {
+ construct_impl(0, a, p, std::forward<Args>(args)...);
+ }
+
+ // destroy(Alloc& a, T* p):
+ // Calls a.destroy(p) if possible. If not possible, calls p->~T().
+ template <typename T>
+ static void destroy(Alloc& a, T* p) { // NOLINT(runtime/references)
+ destroy_impl(0, a, p);
+ }
+
+ // max_size(const Alloc& a):
+ // Returns a.max_size() if possible. If not possible, returns
+ // std::numeric_limits<size_type>::max() / sizeof(value_type)
+ static size_type max_size(const Alloc& a) { return max_size_impl(0, a); }
+
+ // select_on_container_copy_construction(const Alloc& a):
+ // Returns a.select_on_container_copy_construction() if possible.
+ // If not possible, returns a.
+ static Alloc select_on_container_copy_construction(const Alloc& a) {
+ return select_on_container_copy_construction_impl(0, a);
+ }
+
+ private:
+ template <typename A>
+ static auto allocate_impl(int, A& a, // NOLINT(runtime/references)
+ size_type n, const_void_pointer hint)
+ -> decltype(a.allocate(n, hint)) {
+ return a.allocate(n, hint);
+ }
+ static pointer allocate_impl(char, Alloc& a, // NOLINT(runtime/references)
+ size_type n, const_void_pointer) {
+ return a.allocate(n);
+ }
+
+ template <typename A, typename... Args>
+ static auto construct_impl(int, A& a, // NOLINT(runtime/references)
+ Args&&... args)
+ -> decltype(a.construct(std::forward<Args>(args)...)) {
+ a.construct(std::forward<Args>(args)...);
+ }
+
+ template <typename T, typename... Args>
+ static void construct_impl(char, Alloc&, T* p, Args&&... args) {
+ ::new (static_cast<void*>(p)) T(std::forward<Args>(args)...);
+ }
+
+ template <typename A, typename T>
+ static auto destroy_impl(int, A& a, // NOLINT(runtime/references)
+ T* p) -> decltype(a.destroy(p)) {
+ a.destroy(p);
+ }
+ template <typename T>
+ static void destroy_impl(char, Alloc&, T* p) {
+ p->~T();
+ }
+
+ template <typename A>
+ static auto max_size_impl(int, const A& a) -> decltype(a.max_size()) {
+ return a.max_size();
+ }
+ static size_type max_size_impl(char, const Alloc&) {
+ return (std::numeric_limits<size_type>::max)() / sizeof(value_type);
+ }
+
+ template <typename A>
+ static auto select_on_container_copy_construction_impl(int, const A& a)
+ -> decltype(a.select_on_container_copy_construction()) {
+ return a.select_on_container_copy_construction();
+ }
+ static Alloc select_on_container_copy_construction_impl(char,
+ const Alloc& a) {
+ return a;
+ }
+};
+#endif // __cplusplus >= 201703L
+
+namespace memory_internal {
+
+// This template alias transforms Alloc::is_nothrow into a metafunction with
+// Alloc as a parameter so it can be used with ExtractOrT<>.
+template <typename Alloc>
+using GetIsNothrow = typename Alloc::is_nothrow;
+
+} // namespace memory_internal
+
+// ABSL_ALLOCATOR_NOTHROW is a build time configuration macro for user to
+// specify whether the default allocation function can throw or never throws.
+// If the allocation function never throws, user should define it to a non-zero
+// value (e.g. via `-DABSL_ALLOCATOR_NOTHROW`).
+// If the allocation function can throw, user should leave it undefined or
+// define it to zero.
+//
+// allocator_is_nothrow<Alloc> is a traits class that derives from
+// Alloc::is_nothrow if present, otherwise std::false_type. It's specialized
+// for Alloc = std::allocator<T> for any type T according to the state of
+// ABSL_ALLOCATOR_NOTHROW.
+//
+// default_allocator_is_nothrow is a class that derives from std::true_type
+// when the default allocator (global operator new) never throws, and
+// std::false_type when it can throw. It is a convenience shorthand for writing
+// allocator_is_nothrow<std::allocator<T>> (T can be any type).
+// NOTE: allocator_is_nothrow<std::allocator<T>> is guaranteed to derive from
+// the same type for all T, because users should specialize neither
+// allocator_is_nothrow nor std::allocator.
+template <typename Alloc>
+struct allocator_is_nothrow
+ : memory_internal::ExtractOrT<memory_internal::GetIsNothrow, Alloc,
+ std::false_type> {};
+
+#if defined(ABSL_ALLOCATOR_NOTHROW) && ABSL_ALLOCATOR_NOTHROW
+template <typename T>
+struct allocator_is_nothrow<std::allocator<T>> : std::true_type {};
+struct default_allocator_is_nothrow : std::true_type {};
+#else
+struct default_allocator_is_nothrow : std::false_type {};
+#endif
+
+namespace memory_internal {
+template <typename Allocator, typename Iterator, typename... Args>
+void ConstructRange(Allocator& alloc, Iterator first, Iterator last,
+ const Args&... args) {
+ for (Iterator cur = first; cur != last; ++cur) {
+ ABSL_INTERNAL_TRY {
+ std::allocator_traits<Allocator>::construct(alloc, std::addressof(*cur),
+ args...);
+ }
+ ABSL_INTERNAL_CATCH_ANY {
+ while (cur != first) {
+ --cur;
+ std::allocator_traits<Allocator>::destroy(alloc, std::addressof(*cur));
+ }
+ ABSL_INTERNAL_RETHROW;
+ }
+ }
+}
+
+template <typename Allocator, typename Iterator, typename InputIterator>
+void CopyRange(Allocator& alloc, Iterator destination, InputIterator first,
+ InputIterator last) {
+ for (Iterator cur = destination; first != last;
+ static_cast<void>(++cur), static_cast<void>(++first)) {
+ ABSL_INTERNAL_TRY {
+ std::allocator_traits<Allocator>::construct(alloc, std::addressof(*cur),
+ *first);
+ }
+ ABSL_INTERNAL_CATCH_ANY {
+ while (cur != destination) {
+ --cur;
+ std::allocator_traits<Allocator>::destroy(alloc, std::addressof(*cur));
+ }
+ ABSL_INTERNAL_RETHROW;
+ }
+ }
+}
+} // namespace memory_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_MEMORY_MEMORY_H_
diff --git a/third_party/abseil/src/absl/memory/memory_exception_safety_test.cc b/third_party/abseil/src/absl/memory/memory_exception_safety_test.cc
new file mode 100644
index 0000000..1df7261
--- /dev/null
+++ b/third_party/abseil/src/absl/memory/memory_exception_safety_test.cc
@@ -0,0 +1,57 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/memory/memory.h"
+
+#include "absl/base/config.h"
+
+#ifdef ABSL_HAVE_EXCEPTIONS
+
+#include "gtest/gtest.h"
+#include "absl/base/internal/exception_safety_testing.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace {
+
+constexpr int kLength = 50;
+using Thrower = testing::ThrowingValue<testing::TypeSpec::kEverythingThrows>;
+
+TEST(MakeUnique, CheckForLeaks) {
+ constexpr int kValue = 321;
+ auto tester = testing::MakeExceptionSafetyTester()
+ .WithInitialValue(Thrower(kValue))
+ // Ensures make_unique does not modify the input. The real
+ // test, though, is ConstructorTracker checking for leaks.
+ .WithContracts(testing::strong_guarantee);
+
+ EXPECT_TRUE(tester.Test([](Thrower* thrower) {
+ static_cast<void>(absl::make_unique<Thrower>(*thrower));
+ }));
+
+ EXPECT_TRUE(tester.Test([](Thrower* thrower) {
+ static_cast<void>(absl::make_unique<Thrower>(std::move(*thrower)));
+ }));
+
+ // Test T[n] overload
+ EXPECT_TRUE(tester.Test([&](Thrower*) {
+ static_cast<void>(absl::make_unique<Thrower[]>(kLength));
+ }));
+}
+
+} // namespace
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_HAVE_EXCEPTIONS
diff --git a/third_party/abseil/src/absl/memory/memory_test.cc b/third_party/abseil/src/absl/memory/memory_test.cc
new file mode 100644
index 0000000..1990c7b
--- /dev/null
+++ b/third_party/abseil/src/absl/memory/memory_test.cc
@@ -0,0 +1,650 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Tests for pointer utilities.
+
+#include "absl/memory/memory.h"
+
+#include <sys/types.h>
+
+#include <cstddef>
+#include <memory>
+#include <string>
+#include <type_traits>
+#include <utility>
+#include <vector>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+
+namespace {
+
+using ::testing::ElementsAre;
+using ::testing::Return;
+
+// This class creates observable behavior to verify that a destructor has
+// been called, via the instance_count variable.
+class DestructorVerifier {
+ public:
+ DestructorVerifier() { ++instance_count_; }
+ DestructorVerifier(const DestructorVerifier&) = delete;
+ DestructorVerifier& operator=(const DestructorVerifier&) = delete;
+ ~DestructorVerifier() { --instance_count_; }
+
+ // The number of instances of this class currently active.
+ static int instance_count() { return instance_count_; }
+
+ private:
+ // The number of instances of this class currently active.
+ static int instance_count_;
+};
+
+int DestructorVerifier::instance_count_ = 0;
+
+TEST(WrapUniqueTest, WrapUnique) {
+ // Test that the unique_ptr is constructed properly by verifying that the
+ // destructor for its payload gets called at the proper time.
+ {
+ auto dv = new DestructorVerifier;
+ EXPECT_EQ(1, DestructorVerifier::instance_count());
+ std::unique_ptr<DestructorVerifier> ptr = absl::WrapUnique(dv);
+ EXPECT_EQ(1, DestructorVerifier::instance_count());
+ }
+ EXPECT_EQ(0, DestructorVerifier::instance_count());
+}
+TEST(MakeUniqueTest, Basic) {
+ std::unique_ptr<std::string> p = absl::make_unique<std::string>();
+ EXPECT_EQ("", *p);
+ p = absl::make_unique<std::string>("hi");
+ EXPECT_EQ("hi", *p);
+}
+
+// InitializationVerifier fills in a pattern when allocated so we can
+// distinguish between its default and value initialized states (without
+// accessing truly uninitialized memory).
+struct InitializationVerifier {
+ static constexpr int kDefaultScalar = 0x43;
+ static constexpr int kDefaultArray = 0x4B;
+
+ static void* operator new(size_t n) {
+ void* ret = ::operator new(n);
+ memset(ret, kDefaultScalar, n);
+ return ret;
+ }
+
+ static void* operator new[](size_t n) {
+ void* ret = ::operator new[](n);
+ memset(ret, kDefaultArray, n);
+ return ret;
+ }
+
+ int a;
+ int b;
+};
+
+TEST(Initialization, MakeUnique) {
+ auto p = absl::make_unique<InitializationVerifier>();
+
+ EXPECT_EQ(0, p->a);
+ EXPECT_EQ(0, p->b);
+}
+
+TEST(Initialization, MakeUniqueArray) {
+ auto p = absl::make_unique<InitializationVerifier[]>(2);
+
+ EXPECT_EQ(0, p[0].a);
+ EXPECT_EQ(0, p[0].b);
+ EXPECT_EQ(0, p[1].a);
+ EXPECT_EQ(0, p[1].b);
+}
+
+struct MoveOnly {
+ MoveOnly() = default;
+ explicit MoveOnly(int i1) : ip1{new int{i1}} {}
+ MoveOnly(int i1, int i2) : ip1{new int{i1}}, ip2{new int{i2}} {}
+ std::unique_ptr<int> ip1;
+ std::unique_ptr<int> ip2;
+};
+
+struct AcceptMoveOnly {
+ explicit AcceptMoveOnly(MoveOnly m) : m_(std::move(m)) {}
+ MoveOnly m_;
+};
+
+TEST(MakeUniqueTest, MoveOnlyTypeAndValue) {
+ using ExpectedType = std::unique_ptr<MoveOnly>;
+ {
+ auto p = absl::make_unique<MoveOnly>();
+ static_assert(std::is_same<decltype(p), ExpectedType>::value,
+ "unexpected return type");
+ EXPECT_TRUE(!p->ip1);
+ EXPECT_TRUE(!p->ip2);
+ }
+ {
+ auto p = absl::make_unique<MoveOnly>(1);
+ static_assert(std::is_same<decltype(p), ExpectedType>::value,
+ "unexpected return type");
+ EXPECT_TRUE(p->ip1 && *p->ip1 == 1);
+ EXPECT_TRUE(!p->ip2);
+ }
+ {
+ auto p = absl::make_unique<MoveOnly>(1, 2);
+ static_assert(std::is_same<decltype(p), ExpectedType>::value,
+ "unexpected return type");
+ EXPECT_TRUE(p->ip1 && *p->ip1 == 1);
+ EXPECT_TRUE(p->ip2 && *p->ip2 == 2);
+ }
+}
+
+TEST(MakeUniqueTest, AcceptMoveOnly) {
+ auto p = absl::make_unique<AcceptMoveOnly>(MoveOnly());
+ p = std::unique_ptr<AcceptMoveOnly>(new AcceptMoveOnly(MoveOnly()));
+}
+
+struct ArrayWatch {
+ void* operator new[](size_t n) {
+ allocs().push_back(n);
+ return ::operator new[](n);
+ }
+ void operator delete[](void* p) { return ::operator delete[](p); }
+ static std::vector<size_t>& allocs() {
+ static auto& v = *new std::vector<size_t>;
+ return v;
+ }
+};
+
+TEST(Make_UniqueTest, Array) {
+ // Ensure state is clean before we start so that these tests
+ // are order-agnostic.
+ ArrayWatch::allocs().clear();
+
+ auto p = absl::make_unique<ArrayWatch[]>(5);
+ static_assert(std::is_same<decltype(p), std::unique_ptr<ArrayWatch[]>>::value,
+ "unexpected return type");
+ EXPECT_THAT(ArrayWatch::allocs(), ElementsAre(5 * sizeof(ArrayWatch)));
+}
+
+TEST(Make_UniqueTest, NotAmbiguousWithStdMakeUnique) {
+ // Ensure that absl::make_unique is not ambiguous with std::make_unique.
+ // In C++14 mode, the below call to make_unique has both types as candidates.
+ struct TakesStdType {
+ explicit TakesStdType(const std::vector<int>& vec) {}
+ };
+ using absl::make_unique;
+ (void)make_unique<TakesStdType>(std::vector<int>());
+}
+
+#if 0
+// These tests shouldn't compile.
+TEST(MakeUniqueTestNC, AcceptMoveOnlyLvalue) {
+ auto m = MoveOnly();
+ auto p = absl::make_unique<AcceptMoveOnly>(m);
+}
+TEST(MakeUniqueTestNC, KnownBoundArray) {
+ auto p = absl::make_unique<ArrayWatch[5]>();
+}
+#endif
+
+TEST(RawPtrTest, RawPointer) {
+ int i = 5;
+ EXPECT_EQ(&i, absl::RawPtr(&i));
+}
+
+TEST(RawPtrTest, SmartPointer) {
+ int* o = new int(5);
+ std::unique_ptr<int> p(o);
+ EXPECT_EQ(o, absl::RawPtr(p));
+}
+
+class IntPointerNonConstDeref {
+ public:
+ explicit IntPointerNonConstDeref(int* p) : p_(p) {}
+ friend bool operator!=(const IntPointerNonConstDeref& a, std::nullptr_t) {
+ return a.p_ != nullptr;
+ }
+ int& operator*() { return *p_; }
+
+ private:
+ std::unique_ptr<int> p_;
+};
+
+TEST(RawPtrTest, SmartPointerNonConstDereference) {
+ int* o = new int(5);
+ IntPointerNonConstDeref p(o);
+ EXPECT_EQ(o, absl::RawPtr(p));
+}
+
+TEST(RawPtrTest, NullValuedRawPointer) {
+ int* p = nullptr;
+ EXPECT_EQ(nullptr, absl::RawPtr(p));
+}
+
+TEST(RawPtrTest, NullValuedSmartPointer) {
+ std::unique_ptr<int> p;
+ EXPECT_EQ(nullptr, absl::RawPtr(p));
+}
+
+TEST(RawPtrTest, Nullptr) {
+ auto p = absl::RawPtr(nullptr);
+ EXPECT_TRUE((std::is_same<std::nullptr_t, decltype(p)>::value));
+ EXPECT_EQ(nullptr, p);
+}
+
+TEST(RawPtrTest, Null) {
+ auto p = absl::RawPtr(nullptr);
+ EXPECT_TRUE((std::is_same<std::nullptr_t, decltype(p)>::value));
+ EXPECT_EQ(nullptr, p);
+}
+
+TEST(RawPtrTest, Zero) {
+ auto p = absl::RawPtr(nullptr);
+ EXPECT_TRUE((std::is_same<std::nullptr_t, decltype(p)>::value));
+ EXPECT_EQ(nullptr, p);
+}
+
+TEST(ShareUniquePtrTest, Share) {
+ auto up = absl::make_unique<int>();
+ int* rp = up.get();
+ auto sp = absl::ShareUniquePtr(std::move(up));
+ EXPECT_EQ(sp.get(), rp);
+}
+
+TEST(ShareUniquePtrTest, ShareNull) {
+ struct NeverDie {
+ using pointer = void*;
+ void operator()(pointer) {
+ ASSERT_TRUE(false) << "Deleter should not have been called.";
+ }
+ };
+
+ std::unique_ptr<void, NeverDie> up;
+ auto sp = absl::ShareUniquePtr(std::move(up));
+}
+
+TEST(WeakenPtrTest, Weak) {
+ auto sp = std::make_shared<int>();
+ auto wp = absl::WeakenPtr(sp);
+ EXPECT_EQ(sp.get(), wp.lock().get());
+ sp.reset();
+ EXPECT_TRUE(wp.expired());
+}
+
+// Should not compile.
+/*
+TEST(RawPtrTest, NotAPointer) {
+ absl::RawPtr(1.5);
+}
+*/
+
+template <typename T>
+struct SmartPointer {
+ using difference_type = char;
+};
+
+struct PointerWith {
+ using element_type = int32_t;
+ using difference_type = int16_t;
+ template <typename U>
+ using rebind = SmartPointer<U>;
+
+ static PointerWith pointer_to(
+ element_type& r) { // NOLINT(runtime/references)
+ return PointerWith{&r};
+ }
+
+ element_type* ptr;
+};
+
+template <typename... Args>
+struct PointerWithout {};
+
+TEST(PointerTraits, Types) {
+ using TraitsWith = absl::pointer_traits<PointerWith>;
+ EXPECT_TRUE((std::is_same<TraitsWith::pointer, PointerWith>::value));
+ EXPECT_TRUE((std::is_same<TraitsWith::element_type, int32_t>::value));
+ EXPECT_TRUE((std::is_same<TraitsWith::difference_type, int16_t>::value));
+ EXPECT_TRUE((
+ std::is_same<TraitsWith::rebind<int64_t>, SmartPointer<int64_t>>::value));
+
+ using TraitsWithout = absl::pointer_traits<PointerWithout<double, int>>;
+ EXPECT_TRUE((std::is_same<TraitsWithout::pointer,
+ PointerWithout<double, int>>::value));
+ EXPECT_TRUE((std::is_same<TraitsWithout::element_type, double>::value));
+ EXPECT_TRUE(
+ (std::is_same<TraitsWithout ::difference_type, std::ptrdiff_t>::value));
+ EXPECT_TRUE((std::is_same<TraitsWithout::rebind<int64_t>,
+ PointerWithout<int64_t, int>>::value));
+
+ using TraitsRawPtr = absl::pointer_traits<char*>;
+ EXPECT_TRUE((std::is_same<TraitsRawPtr::pointer, char*>::value));
+ EXPECT_TRUE((std::is_same<TraitsRawPtr::element_type, char>::value));
+ EXPECT_TRUE(
+ (std::is_same<TraitsRawPtr::difference_type, std::ptrdiff_t>::value));
+ EXPECT_TRUE((std::is_same<TraitsRawPtr::rebind<int64_t>, int64_t*>::value));
+}
+
+TEST(PointerTraits, Functions) {
+ int i;
+ EXPECT_EQ(&i, absl::pointer_traits<PointerWith>::pointer_to(i).ptr);
+ EXPECT_EQ(&i, absl::pointer_traits<int*>::pointer_to(i));
+}
+
+TEST(AllocatorTraits, Typedefs) {
+ struct A {
+ struct value_type {};
+ };
+ EXPECT_TRUE((
+ std::is_same<A,
+ typename absl::allocator_traits<A>::allocator_type>::value));
+ EXPECT_TRUE(
+ (std::is_same<A::value_type,
+ typename absl::allocator_traits<A>::value_type>::value));
+
+ struct X {};
+ struct HasPointer {
+ using value_type = X;
+ using pointer = SmartPointer<X>;
+ };
+ EXPECT_TRUE((std::is_same<SmartPointer<X>, typename absl::allocator_traits<
+ HasPointer>::pointer>::value));
+ EXPECT_TRUE(
+ (std::is_same<A::value_type*,
+ typename absl::allocator_traits<A>::pointer>::value));
+
+ EXPECT_TRUE(
+ (std::is_same<
+ SmartPointer<const X>,
+ typename absl::allocator_traits<HasPointer>::const_pointer>::value));
+ EXPECT_TRUE(
+ (std::is_same<const A::value_type*,
+ typename absl::allocator_traits<A>::const_pointer>::value));
+
+ struct HasVoidPointer {
+ using value_type = X;
+ struct void_pointer {};
+ };
+
+ EXPECT_TRUE((std::is_same<HasVoidPointer::void_pointer,
+ typename absl::allocator_traits<
+ HasVoidPointer>::void_pointer>::value));
+ EXPECT_TRUE(
+ (std::is_same<SmartPointer<void>, typename absl::allocator_traits<
+ HasPointer>::void_pointer>::value));
+
+ struct HasConstVoidPointer {
+ using value_type = X;
+ struct const_void_pointer {};
+ };
+
+ EXPECT_TRUE(
+ (std::is_same<HasConstVoidPointer::const_void_pointer,
+ typename absl::allocator_traits<
+ HasConstVoidPointer>::const_void_pointer>::value));
+ EXPECT_TRUE((std::is_same<SmartPointer<const void>,
+ typename absl::allocator_traits<
+ HasPointer>::const_void_pointer>::value));
+
+ struct HasDifferenceType {
+ using value_type = X;
+ using difference_type = int;
+ };
+ EXPECT_TRUE(
+ (std::is_same<int, typename absl::allocator_traits<
+ HasDifferenceType>::difference_type>::value));
+ EXPECT_TRUE((std::is_same<char, typename absl::allocator_traits<
+ HasPointer>::difference_type>::value));
+
+ struct HasSizeType {
+ using value_type = X;
+ using size_type = unsigned int;
+ };
+ EXPECT_TRUE((std::is_same<unsigned int, typename absl::allocator_traits<
+ HasSizeType>::size_type>::value));
+ EXPECT_TRUE((std::is_same<unsigned char, typename absl::allocator_traits<
+ HasPointer>::size_type>::value));
+
+ struct HasPropagateOnCopy {
+ using value_type = X;
+ struct propagate_on_container_copy_assignment {};
+ };
+
+ EXPECT_TRUE(
+ (std::is_same<HasPropagateOnCopy::propagate_on_container_copy_assignment,
+ typename absl::allocator_traits<HasPropagateOnCopy>::
+ propagate_on_container_copy_assignment>::value));
+ EXPECT_TRUE(
+ (std::is_same<std::false_type,
+ typename absl::allocator_traits<
+ A>::propagate_on_container_copy_assignment>::value));
+
+ struct HasPropagateOnMove {
+ using value_type = X;
+ struct propagate_on_container_move_assignment {};
+ };
+
+ EXPECT_TRUE(
+ (std::is_same<HasPropagateOnMove::propagate_on_container_move_assignment,
+ typename absl::allocator_traits<HasPropagateOnMove>::
+ propagate_on_container_move_assignment>::value));
+ EXPECT_TRUE(
+ (std::is_same<std::false_type,
+ typename absl::allocator_traits<
+ A>::propagate_on_container_move_assignment>::value));
+
+ struct HasPropagateOnSwap {
+ using value_type = X;
+ struct propagate_on_container_swap {};
+ };
+
+ EXPECT_TRUE(
+ (std::is_same<HasPropagateOnSwap::propagate_on_container_swap,
+ typename absl::allocator_traits<HasPropagateOnSwap>::
+ propagate_on_container_swap>::value));
+ EXPECT_TRUE(
+ (std::is_same<std::false_type, typename absl::allocator_traits<A>::
+ propagate_on_container_swap>::value));
+
+ struct HasIsAlwaysEqual {
+ using value_type = X;
+ struct is_always_equal {};
+ };
+
+ EXPECT_TRUE((std::is_same<HasIsAlwaysEqual::is_always_equal,
+ typename absl::allocator_traits<
+ HasIsAlwaysEqual>::is_always_equal>::value));
+ EXPECT_TRUE((std::is_same<std::true_type, typename absl::allocator_traits<
+ A>::is_always_equal>::value));
+ struct NonEmpty {
+ using value_type = X;
+ int i;
+ };
+ EXPECT_TRUE(
+ (std::is_same<std::false_type,
+ absl::allocator_traits<NonEmpty>::is_always_equal>::value));
+}
+
+template <typename T>
+struct AllocWithPrivateInheritance : private std::allocator<T> {
+ using value_type = T;
+};
+
+TEST(AllocatorTraits, RebindWithPrivateInheritance) {
+ // Regression test for some versions of gcc that do not like the sfinae we
+ // used in combination with private inheritance.
+ EXPECT_TRUE(
+ (std::is_same<AllocWithPrivateInheritance<int>,
+ absl::allocator_traits<AllocWithPrivateInheritance<char>>::
+ rebind_alloc<int>>::value));
+}
+
+template <typename T>
+struct Rebound {};
+
+struct AllocWithRebind {
+ using value_type = int;
+ template <typename T>
+ struct rebind {
+ using other = Rebound<T>;
+ };
+};
+
+template <typename T, typename U>
+struct AllocWithoutRebind {
+ using value_type = int;
+};
+
+TEST(AllocatorTraits, Rebind) {
+ EXPECT_TRUE(
+ (std::is_same<Rebound<int>,
+ typename absl::allocator_traits<
+ AllocWithRebind>::template rebind_alloc<int>>::value));
+ EXPECT_TRUE(
+ (std::is_same<absl::allocator_traits<Rebound<int>>,
+ typename absl::allocator_traits<
+ AllocWithRebind>::template rebind_traits<int>>::value));
+
+ EXPECT_TRUE(
+ (std::is_same<AllocWithoutRebind<double, char>,
+ typename absl::allocator_traits<AllocWithoutRebind<
+ int, char>>::template rebind_alloc<double>>::value));
+ EXPECT_TRUE(
+ (std::is_same<absl::allocator_traits<AllocWithoutRebind<double, char>>,
+ typename absl::allocator_traits<AllocWithoutRebind<
+ int, char>>::template rebind_traits<double>>::value));
+}
+
+struct TestValue {
+ TestValue() {}
+ explicit TestValue(int* trace) : trace(trace) { ++*trace; }
+ ~TestValue() {
+ if (trace) --*trace;
+ }
+ int* trace = nullptr;
+};
+
+struct MinimalMockAllocator {
+ MinimalMockAllocator() : value(0) {}
+ explicit MinimalMockAllocator(int value) : value(value) {}
+ MinimalMockAllocator(const MinimalMockAllocator& other)
+ : value(other.value) {}
+ using value_type = TestValue;
+ MOCK_METHOD(value_type*, allocate, (size_t));
+ MOCK_METHOD(void, deallocate, (value_type*, size_t));
+
+ int value;
+};
+
+TEST(AllocatorTraits, FunctionsMinimal) {
+ int trace = 0;
+ int hint;
+ TestValue x(&trace);
+ MinimalMockAllocator mock;
+ using Traits = absl::allocator_traits<MinimalMockAllocator>;
+ EXPECT_CALL(mock, allocate(7)).WillRepeatedly(Return(&x));
+ EXPECT_CALL(mock, deallocate(&x, 7));
+
+ EXPECT_EQ(&x, Traits::allocate(mock, 7));
+ static_cast<void>(Traits::allocate(mock, 7, static_cast<const void*>(&hint)));
+ EXPECT_EQ(&x, Traits::allocate(mock, 7, static_cast<const void*>(&hint)));
+ Traits::deallocate(mock, &x, 7);
+
+ EXPECT_EQ(1, trace);
+ Traits::construct(mock, &x, &trace);
+ EXPECT_EQ(2, trace);
+ Traits::destroy(mock, &x);
+ EXPECT_EQ(1, trace);
+
+ EXPECT_EQ(std::numeric_limits<size_t>::max() / sizeof(TestValue),
+ Traits::max_size(mock));
+
+ EXPECT_EQ(0, mock.value);
+ EXPECT_EQ(0, Traits::select_on_container_copy_construction(mock).value);
+}
+
+struct FullMockAllocator {
+ FullMockAllocator() : value(0) {}
+ explicit FullMockAllocator(int value) : value(value) {}
+ FullMockAllocator(const FullMockAllocator& other) : value(other.value) {}
+ using value_type = TestValue;
+ MOCK_METHOD(value_type*, allocate, (size_t));
+ MOCK_METHOD(value_type*, allocate, (size_t, const void*));
+ MOCK_METHOD(void, construct, (value_type*, int*));
+ MOCK_METHOD(void, destroy, (value_type*));
+ MOCK_METHOD(size_t, max_size, (),
+ (const));
+ MOCK_METHOD(FullMockAllocator, select_on_container_copy_construction, (),
+ (const));
+
+ int value;
+};
+
+TEST(AllocatorTraits, FunctionsFull) {
+ int trace = 0;
+ int hint;
+ TestValue x(&trace), y;
+ FullMockAllocator mock;
+ using Traits = absl::allocator_traits<FullMockAllocator>;
+ EXPECT_CALL(mock, allocate(7)).WillRepeatedly(Return(&x));
+ EXPECT_CALL(mock, allocate(13, &hint)).WillRepeatedly(Return(&y));
+ EXPECT_CALL(mock, construct(&x, &trace));
+ EXPECT_CALL(mock, destroy(&x));
+ EXPECT_CALL(mock, max_size()).WillRepeatedly(Return(17));
+ EXPECT_CALL(mock, select_on_container_copy_construction())
+ .WillRepeatedly(Return(FullMockAllocator(23)));
+
+ EXPECT_EQ(&x, Traits::allocate(mock, 7));
+ EXPECT_EQ(&y, Traits::allocate(mock, 13, static_cast<const void*>(&hint)));
+
+ EXPECT_EQ(1, trace);
+ Traits::construct(mock, &x, &trace);
+ EXPECT_EQ(1, trace);
+ Traits::destroy(mock, &x);
+ EXPECT_EQ(1, trace);
+
+ EXPECT_EQ(17, Traits::max_size(mock));
+
+ EXPECT_EQ(0, mock.value);
+ EXPECT_EQ(23, Traits::select_on_container_copy_construction(mock).value);
+}
+
+TEST(AllocatorNoThrowTest, DefaultAllocator) {
+#if defined(ABSL_ALLOCATOR_NOTHROW) && ABSL_ALLOCATOR_NOTHROW
+ EXPECT_TRUE(absl::default_allocator_is_nothrow::value);
+#else
+ EXPECT_FALSE(absl::default_allocator_is_nothrow::value);
+#endif
+}
+
+TEST(AllocatorNoThrowTest, StdAllocator) {
+#if defined(ABSL_ALLOCATOR_NOTHROW) && ABSL_ALLOCATOR_NOTHROW
+ EXPECT_TRUE(absl::allocator_is_nothrow<std::allocator<int>>::value);
+#else
+ EXPECT_FALSE(absl::allocator_is_nothrow<std::allocator<int>>::value);
+#endif
+}
+
+TEST(AllocatorNoThrowTest, CustomAllocator) {
+ struct NoThrowAllocator {
+ using is_nothrow = std::true_type;
+ };
+ struct CanThrowAllocator {
+ using is_nothrow = std::false_type;
+ };
+ struct UnspecifiedAllocator {};
+ EXPECT_TRUE(absl::allocator_is_nothrow<NoThrowAllocator>::value);
+ EXPECT_FALSE(absl::allocator_is_nothrow<CanThrowAllocator>::value);
+ EXPECT_FALSE(absl::allocator_is_nothrow<UnspecifiedAllocator>::value);
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/meta/BUILD.bazel b/third_party/abseil/src/absl/meta/BUILD.bazel
new file mode 100644
index 0000000..5585fcc
--- /dev/null
+++ b/third_party/abseil/src/absl/meta/BUILD.bazel
@@ -0,0 +1,48 @@
+#
+# Copyright 2019 The Abseil Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+load("@rules_cc//cc:defs.bzl", "cc_library", "cc_test")
+load(
+ "//absl:copts/configure_copts.bzl",
+ "ABSL_DEFAULT_COPTS",
+ "ABSL_DEFAULT_LINKOPTS",
+ "ABSL_TEST_COPTS",
+)
+
+package(default_visibility = ["//visibility:public"])
+
+licenses(["notice"])
+
+cc_library(
+ name = "type_traits",
+ hdrs = ["type_traits.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ "//absl/base:config",
+ ],
+)
+
+cc_test(
+ name = "type_traits_test",
+ srcs = ["type_traits_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":type_traits",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
diff --git a/third_party/abseil/src/absl/meta/CMakeLists.txt b/third_party/abseil/src/absl/meta/CMakeLists.txt
new file mode 100644
index 0000000..672ead2
--- /dev/null
+++ b/third_party/abseil/src/absl/meta/CMakeLists.txt
@@ -0,0 +1,50 @@
+#
+# Copyright 2017 The Abseil Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+absl_cc_library(
+ NAME
+ type_traits
+ HDRS
+ "type_traits.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::config
+ PUBLIC
+)
+
+absl_cc_test(
+ NAME
+ type_traits_test
+ SRCS
+ "type_traits_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::type_traits
+ gmock_main
+)
+
+# component target
+absl_cc_library(
+ NAME
+ meta
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::type_traits
+ PUBLIC
+)
diff --git a/third_party/abseil/src/absl/meta/type_traits.h b/third_party/abseil/src/absl/meta/type_traits.h
new file mode 100644
index 0000000..d5cb5f3
--- /dev/null
+++ b/third_party/abseil/src/absl/meta/type_traits.h
@@ -0,0 +1,767 @@
+//
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// type_traits.h
+// -----------------------------------------------------------------------------
+//
+// This file contains C++11-compatible versions of standard <type_traits> API
+// functions for determining the characteristics of types. Such traits can
+// support type inference, classification, and transformation, as well as
+// make it easier to write templates based on generic type behavior.
+//
+// See https://en.cppreference.com/w/cpp/header/type_traits
+//
+// WARNING: use of many of the constructs in this header will count as "complex
+// template metaprogramming", so before proceeding, please carefully consider
+// https://google.github.io/styleguide/cppguide.html#Template_metaprogramming
+//
+// WARNING: using template metaprogramming to detect or depend on API
+// features is brittle and not guaranteed. Neither the standard library nor
+// Abseil provides any guarantee that APIs are stable in the face of template
+// metaprogramming. Use with caution.
+#ifndef ABSL_META_TYPE_TRAITS_H_
+#define ABSL_META_TYPE_TRAITS_H_
+
+#include <stddef.h>
+#include <functional>
+#include <type_traits>
+
+#include "absl/base/config.h"
+
+// MSVC constructibility traits do not detect destructor properties and so our
+// implementations should not use them as a source-of-truth.
+#if defined(_MSC_VER) && !defined(__clang__) && !defined(__GNUC__)
+#define ABSL_META_INTERNAL_STD_CONSTRUCTION_TRAITS_DONT_CHECK_DESTRUCTION 1
+#endif
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+// Defined and documented later on in this file.
+template <typename T>
+struct is_trivially_destructible;
+
+// Defined and documented later on in this file.
+template <typename T>
+struct is_trivially_move_assignable;
+
+namespace type_traits_internal {
+
+// Silence MSVC warnings about the destructor being defined as deleted.
+#if defined(_MSC_VER) && !defined(__GNUC__)
+#pragma warning(push)
+#pragma warning(disable : 4624)
+#endif // defined(_MSC_VER) && !defined(__GNUC__)
+
+template <class T>
+union SingleMemberUnion {
+ T t;
+};
+
+// Restore the state of the destructor warning that was silenced above.
+#if defined(_MSC_VER) && !defined(__GNUC__)
+#pragma warning(pop)
+#endif // defined(_MSC_VER) && !defined(__GNUC__)
+
+template <class T>
+struct IsTriviallyMoveConstructibleObject
+ : std::integral_constant<
+ bool, std::is_move_constructible<
+ type_traits_internal::SingleMemberUnion<T>>::value &&
+ absl::is_trivially_destructible<T>::value> {};
+
+template <class T>
+struct IsTriviallyCopyConstructibleObject
+ : std::integral_constant<
+ bool, std::is_copy_constructible<
+ type_traits_internal::SingleMemberUnion<T>>::value &&
+ absl::is_trivially_destructible<T>::value> {};
+
+template <class T>
+struct IsTriviallyMoveAssignableReference : std::false_type {};
+
+template <class T>
+struct IsTriviallyMoveAssignableReference<T&>
+ : absl::is_trivially_move_assignable<T>::type {};
+
+template <class T>
+struct IsTriviallyMoveAssignableReference<T&&>
+ : absl::is_trivially_move_assignable<T>::type {};
+
+template <typename... Ts>
+struct VoidTImpl {
+ using type = void;
+};
+
+// This trick to retrieve a default alignment is necessary for our
+// implementation of aligned_storage_t to be consistent with any implementation
+// of std::aligned_storage.
+template <size_t Len, typename T = std::aligned_storage<Len>>
+struct default_alignment_of_aligned_storage;
+
+template <size_t Len, size_t Align>
+struct default_alignment_of_aligned_storage<Len,
+ std::aligned_storage<Len, Align>> {
+ static constexpr size_t value = Align;
+};
+
+////////////////////////////////
+// Library Fundamentals V2 TS //
+////////////////////////////////
+
+// NOTE: The `is_detected` family of templates here differ from the library
+// fundamentals specification in that for library fundamentals, `Op<Args...>` is
+// evaluated as soon as the type `is_detected<Op, Args...>` undergoes
+// substitution, regardless of whether or not the `::value` is accessed. That
+// is inconsistent with all other standard traits and prevents lazy evaluation
+// in larger contexts (such as if the `is_detected` check is a trailing argument
+// of a `conjunction`. This implementation opts to instead be lazy in the same
+// way that the standard traits are (this "defect" of the detection idiom
+// specifications has been reported).
+
+template <class Enabler, template <class...> class Op, class... Args>
+struct is_detected_impl {
+ using type = std::false_type;
+};
+
+template <template <class...> class Op, class... Args>
+struct is_detected_impl<typename VoidTImpl<Op<Args...>>::type, Op, Args...> {
+ using type = std::true_type;
+};
+
+template <template <class...> class Op, class... Args>
+struct is_detected : is_detected_impl<void, Op, Args...>::type {};
+
+template <class Enabler, class To, template <class...> class Op, class... Args>
+struct is_detected_convertible_impl {
+ using type = std::false_type;
+};
+
+template <class To, template <class...> class Op, class... Args>
+struct is_detected_convertible_impl<
+ typename std::enable_if<std::is_convertible<Op<Args...>, To>::value>::type,
+ To, Op, Args...> {
+ using type = std::true_type;
+};
+
+template <class To, template <class...> class Op, class... Args>
+struct is_detected_convertible
+ : is_detected_convertible_impl<void, To, Op, Args...>::type {};
+
+template <typename T>
+using IsCopyAssignableImpl =
+ decltype(std::declval<T&>() = std::declval<const T&>());
+
+template <typename T>
+using IsMoveAssignableImpl = decltype(std::declval<T&>() = std::declval<T&&>());
+
+} // namespace type_traits_internal
+
+// MSVC 19.20 has a regression that causes our workarounds to fail, but their
+// std forms now appear to be compliant.
+#if defined(_MSC_VER) && !defined(__clang__) && (_MSC_VER >= 1920)
+
+template <typename T>
+using is_copy_assignable = std::is_copy_assignable<T>;
+
+template <typename T>
+using is_move_assignable = std::is_move_assignable<T>;
+
+#else
+
+template <typename T>
+struct is_copy_assignable : type_traits_internal::is_detected<
+ type_traits_internal::IsCopyAssignableImpl, T> {
+};
+
+template <typename T>
+struct is_move_assignable : type_traits_internal::is_detected<
+ type_traits_internal::IsMoveAssignableImpl, T> {
+};
+
+#endif
+
+// void_t()
+//
+// Ignores the type of any its arguments and returns `void`. In general, this
+// metafunction allows you to create a general case that maps to `void` while
+// allowing specializations that map to specific types.
+//
+// This metafunction is designed to be a drop-in replacement for the C++17
+// `std::void_t` metafunction.
+//
+// NOTE: `absl::void_t` does not use the standard-specified implementation so
+// that it can remain compatible with gcc < 5.1. This can introduce slightly
+// different behavior, such as when ordering partial specializations.
+template <typename... Ts>
+using void_t = typename type_traits_internal::VoidTImpl<Ts...>::type;
+
+// conjunction
+//
+// Performs a compile-time logical AND operation on the passed types (which
+// must have `::value` members convertible to `bool`. Short-circuits if it
+// encounters any `false` members (and does not compare the `::value` members
+// of any remaining arguments).
+//
+// This metafunction is designed to be a drop-in replacement for the C++17
+// `std::conjunction` metafunction.
+template <typename... Ts>
+struct conjunction : std::true_type {};
+
+template <typename T, typename... Ts>
+struct conjunction<T, Ts...>
+ : std::conditional<T::value, conjunction<Ts...>, T>::type {};
+
+template <typename T>
+struct conjunction<T> : T {};
+
+// disjunction
+//
+// Performs a compile-time logical OR operation on the passed types (which
+// must have `::value` members convertible to `bool`. Short-circuits if it
+// encounters any `true` members (and does not compare the `::value` members
+// of any remaining arguments).
+//
+// This metafunction is designed to be a drop-in replacement for the C++17
+// `std::disjunction` metafunction.
+template <typename... Ts>
+struct disjunction : std::false_type {};
+
+template <typename T, typename... Ts>
+struct disjunction<T, Ts...> :
+ std::conditional<T::value, T, disjunction<Ts...>>::type {};
+
+template <typename T>
+struct disjunction<T> : T {};
+
+// negation
+//
+// Performs a compile-time logical NOT operation on the passed type (which
+// must have `::value` members convertible to `bool`.
+//
+// This metafunction is designed to be a drop-in replacement for the C++17
+// `std::negation` metafunction.
+template <typename T>
+struct negation : std::integral_constant<bool, !T::value> {};
+
+// is_function()
+//
+// Determines whether the passed type `T` is a function type.
+//
+// This metafunction is designed to be a drop-in replacement for the C++11
+// `std::is_function()` metafunction for platforms that have incomplete C++11
+// support (such as libstdc++ 4.x).
+//
+// This metafunction works because appending `const` to a type does nothing to
+// function types and reference types (and forms a const-qualified type
+// otherwise).
+template <typename T>
+struct is_function
+ : std::integral_constant<
+ bool, !(std::is_reference<T>::value ||
+ std::is_const<typename std::add_const<T>::type>::value)> {};
+
+// is_trivially_destructible()
+//
+// Determines whether the passed type `T` is trivially destructible.
+//
+// This metafunction is designed to be a drop-in replacement for the C++11
+// `std::is_trivially_destructible()` metafunction for platforms that have
+// incomplete C++11 support (such as libstdc++ 4.x). On any platforms that do
+// fully support C++11, we check whether this yields the same result as the std
+// implementation.
+//
+// NOTE: the extensions (__has_trivial_xxx) are implemented in gcc (version >=
+// 4.3) and clang. Since we are supporting libstdc++ > 4.7, they should always
+// be present. These extensions are documented at
+// https://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html#Type-Traits.
+template <typename T>
+struct is_trivially_destructible
+ : std::integral_constant<bool, __has_trivial_destructor(T) &&
+ std::is_destructible<T>::value> {
+#ifdef ABSL_HAVE_STD_IS_TRIVIALLY_DESTRUCTIBLE
+ private:
+ static constexpr bool compliant = std::is_trivially_destructible<T>::value ==
+ is_trivially_destructible::value;
+ static_assert(compliant || std::is_trivially_destructible<T>::value,
+ "Not compliant with std::is_trivially_destructible; "
+ "Standard: false, Implementation: true");
+ static_assert(compliant || !std::is_trivially_destructible<T>::value,
+ "Not compliant with std::is_trivially_destructible; "
+ "Standard: true, Implementation: false");
+#endif // ABSL_HAVE_STD_IS_TRIVIALLY_DESTRUCTIBLE
+};
+
+// is_trivially_default_constructible()
+//
+// Determines whether the passed type `T` is trivially default constructible.
+//
+// This metafunction is designed to be a drop-in replacement for the C++11
+// `std::is_trivially_default_constructible()` metafunction for platforms that
+// have incomplete C++11 support (such as libstdc++ 4.x). On any platforms that
+// do fully support C++11, we check whether this yields the same result as the
+// std implementation.
+//
+// NOTE: according to the C++ standard, Section: 20.15.4.3 [meta.unary.prop]
+// "The predicate condition for a template specialization is_constructible<T,
+// Args...> shall be satisfied if and only if the following variable
+// definition would be well-formed for some invented variable t:
+//
+// T t(declval<Args>()...);
+//
+// is_trivially_constructible<T, Args...> additionally requires that the
+// variable definition does not call any operation that is not trivial.
+// For the purposes of this check, the call to std::declval is considered
+// trivial."
+//
+// Notes from https://en.cppreference.com/w/cpp/types/is_constructible:
+// In many implementations, is_nothrow_constructible also checks if the
+// destructor throws because it is effectively noexcept(T(arg)). Same
+// applies to is_trivially_constructible, which, in these implementations, also
+// requires that the destructor is trivial.
+// GCC bug 51452: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=51452
+// LWG issue 2116: http://cplusplus.github.io/LWG/lwg-active.html#2116.
+//
+// "T obj();" need to be well-formed and not call any nontrivial operation.
+// Nontrivially destructible types will cause the expression to be nontrivial.
+template <typename T>
+struct is_trivially_default_constructible
+ : std::integral_constant<bool, __has_trivial_constructor(T) &&
+ std::is_default_constructible<T>::value &&
+ is_trivially_destructible<T>::value> {
+#if defined(ABSL_HAVE_STD_IS_TRIVIALLY_CONSTRUCTIBLE) && \
+ !defined( \
+ ABSL_META_INTERNAL_STD_CONSTRUCTION_TRAITS_DONT_CHECK_DESTRUCTION)
+ private:
+ static constexpr bool compliant =
+ std::is_trivially_default_constructible<T>::value ==
+ is_trivially_default_constructible::value;
+ static_assert(compliant || std::is_trivially_default_constructible<T>::value,
+ "Not compliant with std::is_trivially_default_constructible; "
+ "Standard: false, Implementation: true");
+ static_assert(compliant || !std::is_trivially_default_constructible<T>::value,
+ "Not compliant with std::is_trivially_default_constructible; "
+ "Standard: true, Implementation: false");
+#endif // ABSL_HAVE_STD_IS_TRIVIALLY_CONSTRUCTIBLE
+};
+
+// is_trivially_move_constructible()
+//
+// Determines whether the passed type `T` is trivially move constructible.
+//
+// This metafunction is designed to be a drop-in replacement for the C++11
+// `std::is_trivially_move_constructible()` metafunction for platforms that have
+// incomplete C++11 support (such as libstdc++ 4.x). On any platforms that do
+// fully support C++11, we check whether this yields the same result as the std
+// implementation.
+//
+// NOTE: `T obj(declval<T>());` needs to be well-formed and not call any
+// nontrivial operation. Nontrivially destructible types will cause the
+// expression to be nontrivial.
+template <typename T>
+struct is_trivially_move_constructible
+ : std::conditional<
+ std::is_object<T>::value && !std::is_array<T>::value,
+ type_traits_internal::IsTriviallyMoveConstructibleObject<T>,
+ std::is_reference<T>>::type::type {
+#if defined(ABSL_HAVE_STD_IS_TRIVIALLY_CONSTRUCTIBLE) && \
+ !defined( \
+ ABSL_META_INTERNAL_STD_CONSTRUCTION_TRAITS_DONT_CHECK_DESTRUCTION)
+ private:
+ static constexpr bool compliant =
+ std::is_trivially_move_constructible<T>::value ==
+ is_trivially_move_constructible::value;
+ static_assert(compliant || std::is_trivially_move_constructible<T>::value,
+ "Not compliant with std::is_trivially_move_constructible; "
+ "Standard: false, Implementation: true");
+ static_assert(compliant || !std::is_trivially_move_constructible<T>::value,
+ "Not compliant with std::is_trivially_move_constructible; "
+ "Standard: true, Implementation: false");
+#endif // ABSL_HAVE_STD_IS_TRIVIALLY_CONSTRUCTIBLE
+};
+
+// is_trivially_copy_constructible()
+//
+// Determines whether the passed type `T` is trivially copy constructible.
+//
+// This metafunction is designed to be a drop-in replacement for the C++11
+// `std::is_trivially_copy_constructible()` metafunction for platforms that have
+// incomplete C++11 support (such as libstdc++ 4.x). On any platforms that do
+// fully support C++11, we check whether this yields the same result as the std
+// implementation.
+//
+// NOTE: `T obj(declval<const T&>());` needs to be well-formed and not call any
+// nontrivial operation. Nontrivially destructible types will cause the
+// expression to be nontrivial.
+template <typename T>
+struct is_trivially_copy_constructible
+ : std::conditional<
+ std::is_object<T>::value && !std::is_array<T>::value,
+ type_traits_internal::IsTriviallyCopyConstructibleObject<T>,
+ std::is_lvalue_reference<T>>::type::type {
+#if defined(ABSL_HAVE_STD_IS_TRIVIALLY_CONSTRUCTIBLE) && \
+ !defined( \
+ ABSL_META_INTERNAL_STD_CONSTRUCTION_TRAITS_DONT_CHECK_DESTRUCTION)
+ private:
+ static constexpr bool compliant =
+ std::is_trivially_copy_constructible<T>::value ==
+ is_trivially_copy_constructible::value;
+ static_assert(compliant || std::is_trivially_copy_constructible<T>::value,
+ "Not compliant with std::is_trivially_copy_constructible; "
+ "Standard: false, Implementation: true");
+ static_assert(compliant || !std::is_trivially_copy_constructible<T>::value,
+ "Not compliant with std::is_trivially_copy_constructible; "
+ "Standard: true, Implementation: false");
+#endif // ABSL_HAVE_STD_IS_TRIVIALLY_CONSTRUCTIBLE
+};
+
+// is_trivially_move_assignable()
+//
+// Determines whether the passed type `T` is trivially move assignable.
+//
+// This metafunction is designed to be a drop-in replacement for the C++11
+// `std::is_trivially_move_assignable()` metafunction for platforms that have
+// incomplete C++11 support (such as libstdc++ 4.x). On any platforms that do
+// fully support C++11, we check whether this yields the same result as the std
+// implementation.
+//
+// NOTE: `is_assignable<T, U>::value` is `true` if the expression
+// `declval<T>() = declval<U>()` is well-formed when treated as an unevaluated
+// operand. `is_trivially_assignable<T, U>` requires the assignment to call no
+// operation that is not trivial. `is_trivially_copy_assignable<T>` is simply
+// `is_trivially_assignable<T&, T>`.
+template <typename T>
+struct is_trivially_move_assignable
+ : std::conditional<
+ std::is_object<T>::value && !std::is_array<T>::value &&
+ std::is_move_assignable<T>::value,
+ std::is_move_assignable<type_traits_internal::SingleMemberUnion<T>>,
+ type_traits_internal::IsTriviallyMoveAssignableReference<T>>::type::
+ type {
+#ifdef ABSL_HAVE_STD_IS_TRIVIALLY_ASSIGNABLE
+ private:
+ static constexpr bool compliant =
+ std::is_trivially_move_assignable<T>::value ==
+ is_trivially_move_assignable::value;
+ static_assert(compliant || std::is_trivially_move_assignable<T>::value,
+ "Not compliant with std::is_trivially_move_assignable; "
+ "Standard: false, Implementation: true");
+ static_assert(compliant || !std::is_trivially_move_assignable<T>::value,
+ "Not compliant with std::is_trivially_move_assignable; "
+ "Standard: true, Implementation: false");
+#endif // ABSL_HAVE_STD_IS_TRIVIALLY_ASSIGNABLE
+};
+
+// is_trivially_copy_assignable()
+//
+// Determines whether the passed type `T` is trivially copy assignable.
+//
+// This metafunction is designed to be a drop-in replacement for the C++11
+// `std::is_trivially_copy_assignable()` metafunction for platforms that have
+// incomplete C++11 support (such as libstdc++ 4.x). On any platforms that do
+// fully support C++11, we check whether this yields the same result as the std
+// implementation.
+//
+// NOTE: `is_assignable<T, U>::value` is `true` if the expression
+// `declval<T>() = declval<U>()` is well-formed when treated as an unevaluated
+// operand. `is_trivially_assignable<T, U>` requires the assignment to call no
+// operation that is not trivial. `is_trivially_copy_assignable<T>` is simply
+// `is_trivially_assignable<T&, const T&>`.
+template <typename T>
+struct is_trivially_copy_assignable
+ : std::integral_constant<
+ bool, __has_trivial_assign(typename std::remove_reference<T>::type) &&
+ absl::is_copy_assignable<T>::value> {
+#ifdef ABSL_HAVE_STD_IS_TRIVIALLY_ASSIGNABLE
+ private:
+ static constexpr bool compliant =
+ std::is_trivially_copy_assignable<T>::value ==
+ is_trivially_copy_assignable::value;
+ static_assert(compliant || std::is_trivially_copy_assignable<T>::value,
+ "Not compliant with std::is_trivially_copy_assignable; "
+ "Standard: false, Implementation: true");
+ static_assert(compliant || !std::is_trivially_copy_assignable<T>::value,
+ "Not compliant with std::is_trivially_copy_assignable; "
+ "Standard: true, Implementation: false");
+#endif // ABSL_HAVE_STD_IS_TRIVIALLY_ASSIGNABLE
+};
+
+namespace type_traits_internal {
+// is_trivially_copyable()
+//
+// Determines whether the passed type `T` is trivially copyable.
+//
+// This metafunction is designed to be a drop-in replacement for the C++11
+// `std::is_trivially_copyable()` metafunction for platforms that have
+// incomplete C++11 support (such as libstdc++ 4.x). We use the C++17 definition
+// of TriviallyCopyable.
+//
+// NOTE: `is_trivially_copyable<T>::value` is `true` if all of T's copy/move
+// constructors/assignment operators are trivial or deleted, T has at least
+// one non-deleted copy/move constructor/assignment operator, and T is trivially
+// destructible. Arrays of trivially copyable types are trivially copyable.
+//
+// We expose this metafunction only for internal use within absl.
+template <typename T>
+class is_trivially_copyable_impl {
+ using ExtentsRemoved = typename std::remove_all_extents<T>::type;
+ static constexpr bool kIsCopyOrMoveConstructible =
+ std::is_copy_constructible<ExtentsRemoved>::value ||
+ std::is_move_constructible<ExtentsRemoved>::value;
+ static constexpr bool kIsCopyOrMoveAssignable =
+ absl::is_copy_assignable<ExtentsRemoved>::value ||
+ absl::is_move_assignable<ExtentsRemoved>::value;
+
+ public:
+ static constexpr bool kValue =
+ (__has_trivial_copy(ExtentsRemoved) || !kIsCopyOrMoveConstructible) &&
+ (__has_trivial_assign(ExtentsRemoved) || !kIsCopyOrMoveAssignable) &&
+ (kIsCopyOrMoveConstructible || kIsCopyOrMoveAssignable) &&
+ is_trivially_destructible<ExtentsRemoved>::value &&
+ // We need to check for this explicitly because otherwise we'll say
+ // references are trivial copyable when compiled by MSVC.
+ !std::is_reference<ExtentsRemoved>::value;
+};
+
+template <typename T>
+struct is_trivially_copyable
+ : std::integral_constant<
+ bool, type_traits_internal::is_trivially_copyable_impl<T>::kValue> {};
+} // namespace type_traits_internal
+
+// -----------------------------------------------------------------------------
+// C++14 "_t" trait aliases
+// -----------------------------------------------------------------------------
+
+template <typename T>
+using remove_cv_t = typename std::remove_cv<T>::type;
+
+template <typename T>
+using remove_const_t = typename std::remove_const<T>::type;
+
+template <typename T>
+using remove_volatile_t = typename std::remove_volatile<T>::type;
+
+template <typename T>
+using add_cv_t = typename std::add_cv<T>::type;
+
+template <typename T>
+using add_const_t = typename std::add_const<T>::type;
+
+template <typename T>
+using add_volatile_t = typename std::add_volatile<T>::type;
+
+template <typename T>
+using remove_reference_t = typename std::remove_reference<T>::type;
+
+template <typename T>
+using add_lvalue_reference_t = typename std::add_lvalue_reference<T>::type;
+
+template <typename T>
+using add_rvalue_reference_t = typename std::add_rvalue_reference<T>::type;
+
+template <typename T>
+using remove_pointer_t = typename std::remove_pointer<T>::type;
+
+template <typename T>
+using add_pointer_t = typename std::add_pointer<T>::type;
+
+template <typename T>
+using make_signed_t = typename std::make_signed<T>::type;
+
+template <typename T>
+using make_unsigned_t = typename std::make_unsigned<T>::type;
+
+template <typename T>
+using remove_extent_t = typename std::remove_extent<T>::type;
+
+template <typename T>
+using remove_all_extents_t = typename std::remove_all_extents<T>::type;
+
+template <size_t Len, size_t Align = type_traits_internal::
+ default_alignment_of_aligned_storage<Len>::value>
+using aligned_storage_t = typename std::aligned_storage<Len, Align>::type;
+
+template <typename T>
+using decay_t = typename std::decay<T>::type;
+
+template <bool B, typename T = void>
+using enable_if_t = typename std::enable_if<B, T>::type;
+
+template <bool B, typename T, typename F>
+using conditional_t = typename std::conditional<B, T, F>::type;
+
+template <typename... T>
+using common_type_t = typename std::common_type<T...>::type;
+
+template <typename T>
+using underlying_type_t = typename std::underlying_type<T>::type;
+
+
+namespace type_traits_internal {
+
+#if __cplusplus >= 201703L
+// std::result_of is deprecated (C++17) or removed (C++20)
+template<typename> struct result_of;
+template<typename F, typename... Args>
+struct result_of<F(Args...)> : std::invoke_result<F, Args...> {};
+#else
+template<typename F> using result_of = std::result_of<F>;
+#endif
+
+} // namespace type_traits_internal
+
+template<typename F>
+using result_of_t = typename type_traits_internal::result_of<F>::type;
+
+namespace type_traits_internal {
+// In MSVC we can't probe std::hash or stdext::hash because it triggers a
+// static_assert instead of failing substitution. Libc++ prior to 4.0
+// also used a static_assert.
+//
+#if defined(_MSC_VER) || (defined(_LIBCPP_VERSION) && \
+ _LIBCPP_VERSION < 4000 && _LIBCPP_STD_VER > 11)
+#define ABSL_META_INTERNAL_STD_HASH_SFINAE_FRIENDLY_ 0
+#else
+#define ABSL_META_INTERNAL_STD_HASH_SFINAE_FRIENDLY_ 1
+#endif
+
+#if !ABSL_META_INTERNAL_STD_HASH_SFINAE_FRIENDLY_
+template <typename Key, typename = size_t>
+struct IsHashable : std::true_type {};
+#else // ABSL_META_INTERNAL_STD_HASH_SFINAE_FRIENDLY_
+template <typename Key, typename = void>
+struct IsHashable : std::false_type {};
+
+template <typename Key>
+struct IsHashable<
+ Key,
+ absl::enable_if_t<std::is_convertible<
+ decltype(std::declval<std::hash<Key>&>()(std::declval<Key const&>())),
+ std::size_t>::value>> : std::true_type {};
+#endif // !ABSL_META_INTERNAL_STD_HASH_SFINAE_FRIENDLY_
+
+struct AssertHashEnabledHelper {
+ private:
+ static void Sink(...) {}
+ struct NAT {};
+
+ template <class Key>
+ static auto GetReturnType(int)
+ -> decltype(std::declval<std::hash<Key>>()(std::declval<Key const&>()));
+ template <class Key>
+ static NAT GetReturnType(...);
+
+ template <class Key>
+ static std::nullptr_t DoIt() {
+ static_assert(IsHashable<Key>::value,
+ "std::hash<Key> does not provide a call operator");
+ static_assert(
+ std::is_default_constructible<std::hash<Key>>::value,
+ "std::hash<Key> must be default constructible when it is enabled");
+ static_assert(
+ std::is_copy_constructible<std::hash<Key>>::value,
+ "std::hash<Key> must be copy constructible when it is enabled");
+ static_assert(absl::is_copy_assignable<std::hash<Key>>::value,
+ "std::hash<Key> must be copy assignable when it is enabled");
+ // is_destructible is unchecked as it's implied by each of the
+ // is_constructible checks.
+ using ReturnType = decltype(GetReturnType<Key>(0));
+ static_assert(std::is_same<ReturnType, NAT>::value ||
+ std::is_same<ReturnType, size_t>::value,
+ "std::hash<Key> must return size_t");
+ return nullptr;
+ }
+
+ template <class... Ts>
+ friend void AssertHashEnabled();
+};
+
+template <class... Ts>
+inline void AssertHashEnabled() {
+ using Helper = AssertHashEnabledHelper;
+ Helper::Sink(Helper::DoIt<Ts>()...);
+}
+
+} // namespace type_traits_internal
+
+// An internal namespace that is required to implement the C++17 swap traits.
+// It is not further nested in type_traits_internal to avoid long symbol names.
+namespace swap_internal {
+
+// Necessary for the traits.
+using std::swap;
+
+// This declaration prevents global `swap` and `absl::swap` overloads from being
+// considered unless ADL picks them up.
+void swap();
+
+template <class T>
+using IsSwappableImpl = decltype(swap(std::declval<T&>(), std::declval<T&>()));
+
+// NOTE: This dance with the default template parameter is for MSVC.
+template <class T,
+ class IsNoexcept = std::integral_constant<
+ bool, noexcept(swap(std::declval<T&>(), std::declval<T&>()))>>
+using IsNothrowSwappableImpl = typename std::enable_if<IsNoexcept::value>::type;
+
+// IsSwappable
+//
+// Determines whether the standard swap idiom is a valid expression for
+// arguments of type `T`.
+template <class T>
+struct IsSwappable
+ : absl::type_traits_internal::is_detected<IsSwappableImpl, T> {};
+
+// IsNothrowSwappable
+//
+// Determines whether the standard swap idiom is a valid expression for
+// arguments of type `T` and is noexcept.
+template <class T>
+struct IsNothrowSwappable
+ : absl::type_traits_internal::is_detected<IsNothrowSwappableImpl, T> {};
+
+// Swap()
+//
+// Performs the swap idiom from a namespace where valid candidates may only be
+// found in `std` or via ADL.
+template <class T, absl::enable_if_t<IsSwappable<T>::value, int> = 0>
+void Swap(T& lhs, T& rhs) noexcept(IsNothrowSwappable<T>::value) {
+ swap(lhs, rhs);
+}
+
+// StdSwapIsUnconstrained
+//
+// Some standard library implementations are broken in that they do not
+// constrain `std::swap`. This will effectively tell us if we are dealing with
+// one of those implementations.
+using StdSwapIsUnconstrained = IsSwappable<void()>;
+
+} // namespace swap_internal
+
+namespace type_traits_internal {
+
+// Make the swap-related traits/function accessible from this namespace.
+using swap_internal::IsNothrowSwappable;
+using swap_internal::IsSwappable;
+using swap_internal::Swap;
+using swap_internal::StdSwapIsUnconstrained;
+
+} // namespace type_traits_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_META_TYPE_TRAITS_H_
diff --git a/third_party/abseil/src/absl/meta/type_traits_test.cc b/third_party/abseil/src/absl/meta/type_traits_test.cc
new file mode 100644
index 0000000..1aafd0d
--- /dev/null
+++ b/third_party/abseil/src/absl/meta/type_traits_test.cc
@@ -0,0 +1,1368 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/meta/type_traits.h"
+
+#include <cstdint>
+#include <string>
+#include <type_traits>
+#include <utility>
+#include <vector>
+
+#include "gtest/gtest.h"
+
+namespace {
+
+using ::testing::StaticAssertTypeEq;
+
+template <class T, class U>
+struct simple_pair {
+ T first;
+ U second;
+};
+
+struct Dummy {};
+
+struct ReturnType {};
+struct ConvertibleToReturnType {
+ operator ReturnType() const; // NOLINT
+};
+
+// Unique types used as parameter types for testing the detection idiom.
+struct StructA {};
+struct StructB {};
+struct StructC {};
+
+struct TypeWithBarFunction {
+ template <class T,
+ absl::enable_if_t<std::is_same<T&&, StructA&>::value, int> = 0>
+ ReturnType bar(T&&, const StructB&, StructC&&) &&; // NOLINT
+};
+
+struct TypeWithBarFunctionAndConvertibleReturnType {
+ template <class T,
+ absl::enable_if_t<std::is_same<T&&, StructA&>::value, int> = 0>
+ ConvertibleToReturnType bar(T&&, const StructB&, StructC&&) &&; // NOLINT
+};
+
+template <class Class, class... Ts>
+using BarIsCallableImpl =
+ decltype(std::declval<Class>().bar(std::declval<Ts>()...));
+
+template <class Class, class... T>
+using BarIsCallable =
+ absl::type_traits_internal::is_detected<BarIsCallableImpl, Class, T...>;
+
+template <class Class, class... T>
+using BarIsCallableConv = absl::type_traits_internal::is_detected_convertible<
+ ReturnType, BarIsCallableImpl, Class, T...>;
+
+// NOTE: Test of detail type_traits_internal::is_detected.
+TEST(IsDetectedTest, BasicUsage) {
+ EXPECT_TRUE((BarIsCallable<TypeWithBarFunction, StructA&, const StructB&,
+ StructC>::value));
+ EXPECT_TRUE(
+ (BarIsCallable<TypeWithBarFunction, StructA&, StructB&, StructC>::value));
+ EXPECT_TRUE(
+ (BarIsCallable<TypeWithBarFunction, StructA&, StructB, StructC>::value));
+
+ EXPECT_FALSE((BarIsCallable<int, StructA&, const StructB&, StructC>::value));
+ EXPECT_FALSE((BarIsCallable<TypeWithBarFunction&, StructA&, const StructB&,
+ StructC>::value));
+ EXPECT_FALSE((BarIsCallable<TypeWithBarFunction, StructA, const StructB&,
+ StructC>::value));
+}
+
+// NOTE: Test of detail type_traits_internal::is_detected_convertible.
+TEST(IsDetectedConvertibleTest, BasicUsage) {
+ EXPECT_TRUE((BarIsCallableConv<TypeWithBarFunction, StructA&, const StructB&,
+ StructC>::value));
+ EXPECT_TRUE((BarIsCallableConv<TypeWithBarFunction, StructA&, StructB&,
+ StructC>::value));
+ EXPECT_TRUE((BarIsCallableConv<TypeWithBarFunction, StructA&, StructB,
+ StructC>::value));
+ EXPECT_TRUE((BarIsCallableConv<TypeWithBarFunctionAndConvertibleReturnType,
+ StructA&, const StructB&, StructC>::value));
+ EXPECT_TRUE((BarIsCallableConv<TypeWithBarFunctionAndConvertibleReturnType,
+ StructA&, StructB&, StructC>::value));
+ EXPECT_TRUE((BarIsCallableConv<TypeWithBarFunctionAndConvertibleReturnType,
+ StructA&, StructB, StructC>::value));
+
+ EXPECT_FALSE(
+ (BarIsCallableConv<int, StructA&, const StructB&, StructC>::value));
+ EXPECT_FALSE((BarIsCallableConv<TypeWithBarFunction&, StructA&,
+ const StructB&, StructC>::value));
+ EXPECT_FALSE((BarIsCallableConv<TypeWithBarFunction, StructA, const StructB&,
+ StructC>::value));
+ EXPECT_FALSE((BarIsCallableConv<TypeWithBarFunctionAndConvertibleReturnType&,
+ StructA&, const StructB&, StructC>::value));
+ EXPECT_FALSE((BarIsCallableConv<TypeWithBarFunctionAndConvertibleReturnType,
+ StructA, const StructB&, StructC>::value));
+}
+
+TEST(VoidTTest, BasicUsage) {
+ StaticAssertTypeEq<void, absl::void_t<Dummy>>();
+ StaticAssertTypeEq<void, absl::void_t<Dummy, Dummy, Dummy>>();
+}
+
+TEST(ConjunctionTest, BasicBooleanLogic) {
+ EXPECT_TRUE(absl::conjunction<>::value);
+ EXPECT_TRUE(absl::conjunction<std::true_type>::value);
+ EXPECT_TRUE((absl::conjunction<std::true_type, std::true_type>::value));
+ EXPECT_FALSE((absl::conjunction<std::true_type, std::false_type>::value));
+ EXPECT_FALSE((absl::conjunction<std::false_type, std::true_type>::value));
+ EXPECT_FALSE((absl::conjunction<std::false_type, std::false_type>::value));
+}
+
+struct MyTrueType {
+ static constexpr bool value = true;
+};
+
+struct MyFalseType {
+ static constexpr bool value = false;
+};
+
+TEST(ConjunctionTest, ShortCircuiting) {
+ EXPECT_FALSE(
+ (absl::conjunction<std::true_type, std::false_type, Dummy>::value));
+ EXPECT_TRUE((std::is_base_of<MyFalseType,
+ absl::conjunction<std::true_type, MyFalseType,
+ std::false_type>>::value));
+ EXPECT_TRUE(
+ (std::is_base_of<MyTrueType,
+ absl::conjunction<std::true_type, MyTrueType>>::value));
+}
+
+TEST(DisjunctionTest, BasicBooleanLogic) {
+ EXPECT_FALSE(absl::disjunction<>::value);
+ EXPECT_FALSE(absl::disjunction<std::false_type>::value);
+ EXPECT_TRUE((absl::disjunction<std::true_type, std::true_type>::value));
+ EXPECT_TRUE((absl::disjunction<std::true_type, std::false_type>::value));
+ EXPECT_TRUE((absl::disjunction<std::false_type, std::true_type>::value));
+ EXPECT_FALSE((absl::disjunction<std::false_type, std::false_type>::value));
+}
+
+TEST(DisjunctionTest, ShortCircuiting) {
+ EXPECT_TRUE(
+ (absl::disjunction<std::false_type, std::true_type, Dummy>::value));
+ EXPECT_TRUE((
+ std::is_base_of<MyTrueType, absl::disjunction<std::false_type, MyTrueType,
+ std::true_type>>::value));
+ EXPECT_TRUE((
+ std::is_base_of<MyFalseType,
+ absl::disjunction<std::false_type, MyFalseType>>::value));
+}
+
+TEST(NegationTest, BasicBooleanLogic) {
+ EXPECT_FALSE(absl::negation<std::true_type>::value);
+ EXPECT_FALSE(absl::negation<MyTrueType>::value);
+ EXPECT_TRUE(absl::negation<std::false_type>::value);
+ EXPECT_TRUE(absl::negation<MyFalseType>::value);
+}
+
+// all member functions are trivial
+class Trivial {
+ int n_;
+};
+
+struct TrivialDestructor {
+ ~TrivialDestructor() = default;
+};
+
+struct NontrivialDestructor {
+ ~NontrivialDestructor() {}
+};
+
+struct DeletedDestructor {
+ ~DeletedDestructor() = delete;
+};
+
+class TrivialDefaultCtor {
+ public:
+ TrivialDefaultCtor() = default;
+ explicit TrivialDefaultCtor(int n) : n_(n) {}
+
+ private:
+ int n_;
+};
+
+class NontrivialDefaultCtor {
+ public:
+ NontrivialDefaultCtor() : n_(1) {}
+
+ private:
+ int n_;
+};
+
+class DeletedDefaultCtor {
+ public:
+ DeletedDefaultCtor() = delete;
+ explicit DeletedDefaultCtor(int n) : n_(n) {}
+
+ private:
+ int n_;
+};
+
+class TrivialMoveCtor {
+ public:
+ explicit TrivialMoveCtor(int n) : n_(n) {}
+ TrivialMoveCtor(TrivialMoveCtor&&) = default;
+ TrivialMoveCtor& operator=(const TrivialMoveCtor& t) {
+ n_ = t.n_;
+ return *this;
+ }
+
+ private:
+ int n_;
+};
+
+class NontrivialMoveCtor {
+ public:
+ explicit NontrivialMoveCtor(int n) : n_(n) {}
+ NontrivialMoveCtor(NontrivialMoveCtor&& t) noexcept : n_(t.n_) {}
+ NontrivialMoveCtor& operator=(const NontrivialMoveCtor&) = default;
+
+ private:
+ int n_;
+};
+
+class TrivialCopyCtor {
+ public:
+ explicit TrivialCopyCtor(int n) : n_(n) {}
+ TrivialCopyCtor(const TrivialCopyCtor&) = default;
+ TrivialCopyCtor& operator=(const TrivialCopyCtor& t) {
+ n_ = t.n_;
+ return *this;
+ }
+
+ private:
+ int n_;
+};
+
+class NontrivialCopyCtor {
+ public:
+ explicit NontrivialCopyCtor(int n) : n_(n) {}
+ NontrivialCopyCtor(const NontrivialCopyCtor& t) : n_(t.n_) {}
+ NontrivialCopyCtor& operator=(const NontrivialCopyCtor&) = default;
+
+ private:
+ int n_;
+};
+
+class DeletedCopyCtor {
+ public:
+ explicit DeletedCopyCtor(int n) : n_(n) {}
+ DeletedCopyCtor(const DeletedCopyCtor&) = delete;
+ DeletedCopyCtor& operator=(const DeletedCopyCtor&) = default;
+
+ private:
+ int n_;
+};
+
+class TrivialMoveAssign {
+ public:
+ explicit TrivialMoveAssign(int n) : n_(n) {}
+ TrivialMoveAssign(const TrivialMoveAssign& t) : n_(t.n_) {}
+ TrivialMoveAssign& operator=(TrivialMoveAssign&&) = default;
+ ~TrivialMoveAssign() {} // can have nontrivial destructor
+ private:
+ int n_;
+};
+
+class NontrivialMoveAssign {
+ public:
+ explicit NontrivialMoveAssign(int n) : n_(n) {}
+ NontrivialMoveAssign(const NontrivialMoveAssign&) = default;
+ NontrivialMoveAssign& operator=(NontrivialMoveAssign&& t) noexcept {
+ n_ = t.n_;
+ return *this;
+ }
+
+ private:
+ int n_;
+};
+
+class TrivialCopyAssign {
+ public:
+ explicit TrivialCopyAssign(int n) : n_(n) {}
+ TrivialCopyAssign(const TrivialCopyAssign& t) : n_(t.n_) {}
+ TrivialCopyAssign& operator=(const TrivialCopyAssign& t) = default;
+ ~TrivialCopyAssign() {} // can have nontrivial destructor
+ private:
+ int n_;
+};
+
+class NontrivialCopyAssign {
+ public:
+ explicit NontrivialCopyAssign(int n) : n_(n) {}
+ NontrivialCopyAssign(const NontrivialCopyAssign&) = default;
+ NontrivialCopyAssign& operator=(const NontrivialCopyAssign& t) {
+ n_ = t.n_;
+ return *this;
+ }
+
+ private:
+ int n_;
+};
+
+class DeletedCopyAssign {
+ public:
+ explicit DeletedCopyAssign(int n) : n_(n) {}
+ DeletedCopyAssign(const DeletedCopyAssign&) = default;
+ DeletedCopyAssign& operator=(const DeletedCopyAssign&) = delete;
+
+ private:
+ int n_;
+};
+
+struct MovableNonCopyable {
+ MovableNonCopyable() = default;
+ MovableNonCopyable(const MovableNonCopyable&) = delete;
+ MovableNonCopyable(MovableNonCopyable&&) = default;
+ MovableNonCopyable& operator=(const MovableNonCopyable&) = delete;
+ MovableNonCopyable& operator=(MovableNonCopyable&&) = default;
+};
+
+struct NonCopyableOrMovable {
+ NonCopyableOrMovable() = default;
+ NonCopyableOrMovable(const NonCopyableOrMovable&) = delete;
+ NonCopyableOrMovable(NonCopyableOrMovable&&) = delete;
+ NonCopyableOrMovable& operator=(const NonCopyableOrMovable&) = delete;
+ NonCopyableOrMovable& operator=(NonCopyableOrMovable&&) = delete;
+};
+
+class Base {
+ public:
+ virtual ~Base() {}
+};
+
+// Old versions of libc++, around Clang 3.5 to 3.6, consider deleted destructors
+// as also being trivial. With the resolution of CWG 1928 and CWG 1734, this
+// is no longer considered true and has thus been amended.
+// Compiler Explorer: https://godbolt.org/g/zT59ZL
+// CWG issue 1734: http://open-std.org/JTC1/SC22/WG21/docs/cwg_defects.html#1734
+// CWG issue 1928: http://open-std.org/JTC1/SC22/WG21/docs/cwg_closed.html#1928
+#if !defined(_LIBCPP_VERSION) || _LIBCPP_VERSION >= 3700
+#define ABSL_TRIVIALLY_DESTRUCTIBLE_CONSIDER_DELETED_DESTRUCTOR_NOT_TRIVIAL 1
+#endif
+
+// As of the moment, GCC versions >5.1 have a problem compiling for
+// std::is_trivially_default_constructible<NontrivialDestructor[10]>, where
+// NontrivialDestructor is a struct with a custom nontrivial destructor. Note
+// that this problem only occurs for arrays of a known size, so something like
+// std::is_trivially_default_constructible<NontrivialDestructor[]> does not
+// have any problems.
+// Compiler Explorer: https://godbolt.org/g/dXRbdK
+// GCC bug 83689: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83689
+#if defined(__clang__) || defined(_MSC_VER) || \
+ (defined(__GNUC__) && __GNUC__ < 5)
+#define ABSL_GCC_BUG_TRIVIALLY_CONSTRUCTIBLE_ON_ARRAY_OF_NONTRIVIAL 1
+#endif
+
+TEST(TypeTraitsTest, TestIsFunction) {
+ struct Callable {
+ void operator()() {}
+ };
+ EXPECT_TRUE(absl::is_function<void()>::value);
+ EXPECT_TRUE(absl::is_function<void()&>::value);
+ EXPECT_TRUE(absl::is_function<void() const>::value);
+ EXPECT_TRUE(absl::is_function<void() noexcept>::value);
+ EXPECT_TRUE(absl::is_function<void(...) noexcept>::value);
+
+ EXPECT_FALSE(absl::is_function<void(*)()>::value);
+ EXPECT_FALSE(absl::is_function<void(&)()>::value);
+ EXPECT_FALSE(absl::is_function<int>::value);
+ EXPECT_FALSE(absl::is_function<Callable>::value);
+}
+
+TEST(TypeTraitsTest, TestTrivialDestructor) {
+ // Verify that arithmetic types and pointers have trivial destructors.
+ EXPECT_TRUE(absl::is_trivially_destructible<bool>::value);
+ EXPECT_TRUE(absl::is_trivially_destructible<char>::value);
+ EXPECT_TRUE(absl::is_trivially_destructible<unsigned char>::value);
+ EXPECT_TRUE(absl::is_trivially_destructible<signed char>::value);
+ EXPECT_TRUE(absl::is_trivially_destructible<wchar_t>::value);
+ EXPECT_TRUE(absl::is_trivially_destructible<int>::value);
+ EXPECT_TRUE(absl::is_trivially_destructible<unsigned int>::value);
+ EXPECT_TRUE(absl::is_trivially_destructible<int16_t>::value);
+ EXPECT_TRUE(absl::is_trivially_destructible<uint16_t>::value);
+ EXPECT_TRUE(absl::is_trivially_destructible<int64_t>::value);
+ EXPECT_TRUE(absl::is_trivially_destructible<uint64_t>::value);
+ EXPECT_TRUE(absl::is_trivially_destructible<float>::value);
+ EXPECT_TRUE(absl::is_trivially_destructible<double>::value);
+ EXPECT_TRUE(absl::is_trivially_destructible<long double>::value);
+ EXPECT_TRUE(absl::is_trivially_destructible<std::string*>::value);
+ EXPECT_TRUE(absl::is_trivially_destructible<Trivial*>::value);
+ EXPECT_TRUE(absl::is_trivially_destructible<const std::string*>::value);
+ EXPECT_TRUE(absl::is_trivially_destructible<const Trivial*>::value);
+ EXPECT_TRUE(absl::is_trivially_destructible<std::string**>::value);
+ EXPECT_TRUE(absl::is_trivially_destructible<Trivial**>::value);
+
+ // classes with destructors
+ EXPECT_TRUE(absl::is_trivially_destructible<Trivial>::value);
+ EXPECT_TRUE(absl::is_trivially_destructible<TrivialDestructor>::value);
+
+ // Verify that types with a nontrivial or deleted destructor
+ // are marked as such.
+ EXPECT_FALSE(absl::is_trivially_destructible<NontrivialDestructor>::value);
+#ifdef ABSL_TRIVIALLY_DESTRUCTIBLE_CONSIDER_DELETED_DESTRUCTOR_NOT_TRIVIAL
+ EXPECT_FALSE(absl::is_trivially_destructible<DeletedDestructor>::value);
+#endif
+
+ // simple_pair of such types is trivial
+ EXPECT_TRUE((absl::is_trivially_destructible<simple_pair<int, int>>::value));
+ EXPECT_TRUE((absl::is_trivially_destructible<
+ simple_pair<Trivial, TrivialDestructor>>::value));
+
+ // Verify that types without trivial destructors are correctly marked as such.
+ EXPECT_FALSE(absl::is_trivially_destructible<std::string>::value);
+ EXPECT_FALSE(absl::is_trivially_destructible<std::vector<int>>::value);
+
+ // Verify that simple_pairs of types without trivial destructors
+ // are not marked as trivial.
+ EXPECT_FALSE((absl::is_trivially_destructible<
+ simple_pair<int, std::string>>::value));
+ EXPECT_FALSE((absl::is_trivially_destructible<
+ simple_pair<std::string, int>>::value));
+
+ // array of such types is trivial
+ using int10 = int[10];
+ EXPECT_TRUE(absl::is_trivially_destructible<int10>::value);
+ using Trivial10 = Trivial[10];
+ EXPECT_TRUE(absl::is_trivially_destructible<Trivial10>::value);
+ using TrivialDestructor10 = TrivialDestructor[10];
+ EXPECT_TRUE(absl::is_trivially_destructible<TrivialDestructor10>::value);
+
+ // Conversely, the opposite also holds.
+ using NontrivialDestructor10 = NontrivialDestructor[10];
+ EXPECT_FALSE(absl::is_trivially_destructible<NontrivialDestructor10>::value);
+}
+
+TEST(TypeTraitsTest, TestTrivialDefaultCtor) {
+ // arithmetic types and pointers have trivial default constructors.
+ EXPECT_TRUE(absl::is_trivially_default_constructible<bool>::value);
+ EXPECT_TRUE(absl::is_trivially_default_constructible<char>::value);
+ EXPECT_TRUE(absl::is_trivially_default_constructible<unsigned char>::value);
+ EXPECT_TRUE(absl::is_trivially_default_constructible<signed char>::value);
+ EXPECT_TRUE(absl::is_trivially_default_constructible<wchar_t>::value);
+ EXPECT_TRUE(absl::is_trivially_default_constructible<int>::value);
+ EXPECT_TRUE(absl::is_trivially_default_constructible<unsigned int>::value);
+ EXPECT_TRUE(absl::is_trivially_default_constructible<int16_t>::value);
+ EXPECT_TRUE(absl::is_trivially_default_constructible<uint16_t>::value);
+ EXPECT_TRUE(absl::is_trivially_default_constructible<int64_t>::value);
+ EXPECT_TRUE(absl::is_trivially_default_constructible<uint64_t>::value);
+ EXPECT_TRUE(absl::is_trivially_default_constructible<float>::value);
+ EXPECT_TRUE(absl::is_trivially_default_constructible<double>::value);
+ EXPECT_TRUE(absl::is_trivially_default_constructible<long double>::value);
+ EXPECT_TRUE(absl::is_trivially_default_constructible<std::string*>::value);
+ EXPECT_TRUE(absl::is_trivially_default_constructible<Trivial*>::value);
+ EXPECT_TRUE(
+ absl::is_trivially_default_constructible<const std::string*>::value);
+ EXPECT_TRUE(absl::is_trivially_default_constructible<const Trivial*>::value);
+ EXPECT_TRUE(absl::is_trivially_default_constructible<std::string**>::value);
+ EXPECT_TRUE(absl::is_trivially_default_constructible<Trivial**>::value);
+
+ // types with compiler generated default ctors
+ EXPECT_TRUE(absl::is_trivially_default_constructible<Trivial>::value);
+ EXPECT_TRUE(
+ absl::is_trivially_default_constructible<TrivialDefaultCtor>::value);
+
+ // Verify that types without them are not.
+ EXPECT_FALSE(
+ absl::is_trivially_default_constructible<NontrivialDefaultCtor>::value);
+ EXPECT_FALSE(
+ absl::is_trivially_default_constructible<DeletedDefaultCtor>::value);
+
+ // types with nontrivial destructor are nontrivial
+ EXPECT_FALSE(
+ absl::is_trivially_default_constructible<NontrivialDestructor>::value);
+
+ // types with vtables
+ EXPECT_FALSE(absl::is_trivially_default_constructible<Base>::value);
+
+ // Verify that simple_pair has trivial constructors where applicable.
+ EXPECT_TRUE((absl::is_trivially_default_constructible<
+ simple_pair<int, char*>>::value));
+ EXPECT_TRUE((absl::is_trivially_default_constructible<
+ simple_pair<int, Trivial>>::value));
+ EXPECT_TRUE((absl::is_trivially_default_constructible<
+ simple_pair<int, TrivialDefaultCtor>>::value));
+
+ // Verify that types without trivial constructors are
+ // correctly marked as such.
+ EXPECT_FALSE(absl::is_trivially_default_constructible<std::string>::value);
+ EXPECT_FALSE(
+ absl::is_trivially_default_constructible<std::vector<int>>::value);
+
+ // Verify that simple_pairs of types without trivial constructors
+ // are not marked as trivial.
+ EXPECT_FALSE((absl::is_trivially_default_constructible<
+ simple_pair<int, std::string>>::value));
+ EXPECT_FALSE((absl::is_trivially_default_constructible<
+ simple_pair<std::string, int>>::value));
+
+ // Verify that arrays of such types are trivially default constructible
+ using int10 = int[10];
+ EXPECT_TRUE(absl::is_trivially_default_constructible<int10>::value);
+ using Trivial10 = Trivial[10];
+ EXPECT_TRUE(absl::is_trivially_default_constructible<Trivial10>::value);
+ using TrivialDefaultCtor10 = TrivialDefaultCtor[10];
+ EXPECT_TRUE(
+ absl::is_trivially_default_constructible<TrivialDefaultCtor10>::value);
+
+ // Conversely, the opposite also holds.
+#ifdef ABSL_GCC_BUG_TRIVIALLY_CONSTRUCTIBLE_ON_ARRAY_OF_NONTRIVIAL
+ using NontrivialDefaultCtor10 = NontrivialDefaultCtor[10];
+ EXPECT_FALSE(
+ absl::is_trivially_default_constructible<NontrivialDefaultCtor10>::value);
+#endif
+}
+
+// GCC prior to 7.4 had a bug in its trivially-constructible traits
+// (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80654).
+// This test makes sure that we do not depend on the trait in these cases when
+// implementing absl triviality traits.
+
+template <class T>
+struct BadConstructors {
+ BadConstructors() { static_assert(T::value, ""); }
+
+ BadConstructors(BadConstructors&&) { static_assert(T::value, ""); }
+
+ BadConstructors(const BadConstructors&) { static_assert(T::value, ""); }
+};
+
+TEST(TypeTraitsTest, TestTrivialityBadConstructors) {
+ using BadType = BadConstructors<int>;
+
+ EXPECT_FALSE(absl::is_trivially_default_constructible<BadType>::value);
+ EXPECT_FALSE(absl::is_trivially_move_constructible<BadType>::value);
+ EXPECT_FALSE(absl::is_trivially_copy_constructible<BadType>::value);
+}
+
+TEST(TypeTraitsTest, TestTrivialMoveCtor) {
+ // Verify that arithmetic types and pointers have trivial move
+ // constructors.
+ EXPECT_TRUE(absl::is_trivially_move_constructible<bool>::value);
+ EXPECT_TRUE(absl::is_trivially_move_constructible<char>::value);
+ EXPECT_TRUE(absl::is_trivially_move_constructible<unsigned char>::value);
+ EXPECT_TRUE(absl::is_trivially_move_constructible<signed char>::value);
+ EXPECT_TRUE(absl::is_trivially_move_constructible<wchar_t>::value);
+ EXPECT_TRUE(absl::is_trivially_move_constructible<int>::value);
+ EXPECT_TRUE(absl::is_trivially_move_constructible<unsigned int>::value);
+ EXPECT_TRUE(absl::is_trivially_move_constructible<int16_t>::value);
+ EXPECT_TRUE(absl::is_trivially_move_constructible<uint16_t>::value);
+ EXPECT_TRUE(absl::is_trivially_move_constructible<int64_t>::value);
+ EXPECT_TRUE(absl::is_trivially_move_constructible<uint64_t>::value);
+ EXPECT_TRUE(absl::is_trivially_move_constructible<float>::value);
+ EXPECT_TRUE(absl::is_trivially_move_constructible<double>::value);
+ EXPECT_TRUE(absl::is_trivially_move_constructible<long double>::value);
+ EXPECT_TRUE(absl::is_trivially_move_constructible<std::string*>::value);
+ EXPECT_TRUE(absl::is_trivially_move_constructible<Trivial*>::value);
+ EXPECT_TRUE(absl::is_trivially_move_constructible<const std::string*>::value);
+ EXPECT_TRUE(absl::is_trivially_move_constructible<const Trivial*>::value);
+ EXPECT_TRUE(absl::is_trivially_move_constructible<std::string**>::value);
+ EXPECT_TRUE(absl::is_trivially_move_constructible<Trivial**>::value);
+
+ // Reference types
+ EXPECT_TRUE(absl::is_trivially_move_constructible<int&>::value);
+ EXPECT_TRUE(absl::is_trivially_move_constructible<int&&>::value);
+
+ // types with compiler generated move ctors
+ EXPECT_TRUE(absl::is_trivially_move_constructible<Trivial>::value);
+ EXPECT_TRUE(absl::is_trivially_move_constructible<TrivialMoveCtor>::value);
+
+ // Verify that types without them (i.e. nontrivial or deleted) are not.
+ EXPECT_FALSE(
+ absl::is_trivially_move_constructible<NontrivialCopyCtor>::value);
+ EXPECT_FALSE(absl::is_trivially_move_constructible<DeletedCopyCtor>::value);
+ EXPECT_FALSE(
+ absl::is_trivially_move_constructible<NonCopyableOrMovable>::value);
+
+ // type with nontrivial destructor are nontrivial move construbtible
+ EXPECT_FALSE(
+ absl::is_trivially_move_constructible<NontrivialDestructor>::value);
+
+ // types with vtables
+ EXPECT_FALSE(absl::is_trivially_move_constructible<Base>::value);
+
+ // Verify that simple_pair of such types is trivially move constructible
+ EXPECT_TRUE(
+ (absl::is_trivially_move_constructible<simple_pair<int, char*>>::value));
+ EXPECT_TRUE((
+ absl::is_trivially_move_constructible<simple_pair<int, Trivial>>::value));
+ EXPECT_TRUE((absl::is_trivially_move_constructible<
+ simple_pair<int, TrivialMoveCtor>>::value));
+
+ // Verify that types without trivial move constructors are
+ // correctly marked as such.
+ EXPECT_FALSE(absl::is_trivially_move_constructible<std::string>::value);
+ EXPECT_FALSE(absl::is_trivially_move_constructible<std::vector<int>>::value);
+
+ // Verify that simple_pairs of types without trivial move constructors
+ // are not marked as trivial.
+ EXPECT_FALSE((absl::is_trivially_move_constructible<
+ simple_pair<int, std::string>>::value));
+ EXPECT_FALSE((absl::is_trivially_move_constructible<
+ simple_pair<std::string, int>>::value));
+
+ // Verify that arrays are not
+ using int10 = int[10];
+ EXPECT_FALSE(absl::is_trivially_move_constructible<int10>::value);
+}
+
+TEST(TypeTraitsTest, TestTrivialCopyCtor) {
+ // Verify that arithmetic types and pointers have trivial copy
+ // constructors.
+ EXPECT_TRUE(absl::is_trivially_copy_constructible<bool>::value);
+ EXPECT_TRUE(absl::is_trivially_copy_constructible<char>::value);
+ EXPECT_TRUE(absl::is_trivially_copy_constructible<unsigned char>::value);
+ EXPECT_TRUE(absl::is_trivially_copy_constructible<signed char>::value);
+ EXPECT_TRUE(absl::is_trivially_copy_constructible<wchar_t>::value);
+ EXPECT_TRUE(absl::is_trivially_copy_constructible<int>::value);
+ EXPECT_TRUE(absl::is_trivially_copy_constructible<unsigned int>::value);
+ EXPECT_TRUE(absl::is_trivially_copy_constructible<int16_t>::value);
+ EXPECT_TRUE(absl::is_trivially_copy_constructible<uint16_t>::value);
+ EXPECT_TRUE(absl::is_trivially_copy_constructible<int64_t>::value);
+ EXPECT_TRUE(absl::is_trivially_copy_constructible<uint64_t>::value);
+ EXPECT_TRUE(absl::is_trivially_copy_constructible<float>::value);
+ EXPECT_TRUE(absl::is_trivially_copy_constructible<double>::value);
+ EXPECT_TRUE(absl::is_trivially_copy_constructible<long double>::value);
+ EXPECT_TRUE(absl::is_trivially_copy_constructible<std::string*>::value);
+ EXPECT_TRUE(absl::is_trivially_copy_constructible<Trivial*>::value);
+ EXPECT_TRUE(absl::is_trivially_copy_constructible<const std::string*>::value);
+ EXPECT_TRUE(absl::is_trivially_copy_constructible<const Trivial*>::value);
+ EXPECT_TRUE(absl::is_trivially_copy_constructible<std::string**>::value);
+ EXPECT_TRUE(absl::is_trivially_copy_constructible<Trivial**>::value);
+
+ // Reference types
+ EXPECT_TRUE(absl::is_trivially_copy_constructible<int&>::value);
+ EXPECT_FALSE(absl::is_trivially_copy_constructible<int&&>::value);
+
+ // types with compiler generated copy ctors
+ EXPECT_TRUE(absl::is_trivially_copy_constructible<Trivial>::value);
+ EXPECT_TRUE(absl::is_trivially_copy_constructible<TrivialCopyCtor>::value);
+
+ // Verify that types without them (i.e. nontrivial or deleted) are not.
+ EXPECT_FALSE(
+ absl::is_trivially_copy_constructible<NontrivialCopyCtor>::value);
+ EXPECT_FALSE(absl::is_trivially_copy_constructible<DeletedCopyCtor>::value);
+ EXPECT_FALSE(
+ absl::is_trivially_copy_constructible<MovableNonCopyable>::value);
+ EXPECT_FALSE(
+ absl::is_trivially_copy_constructible<NonCopyableOrMovable>::value);
+
+ // type with nontrivial destructor are nontrivial copy construbtible
+ EXPECT_FALSE(
+ absl::is_trivially_copy_constructible<NontrivialDestructor>::value);
+
+ // types with vtables
+ EXPECT_FALSE(absl::is_trivially_copy_constructible<Base>::value);
+
+ // Verify that simple_pair of such types is trivially copy constructible
+ EXPECT_TRUE(
+ (absl::is_trivially_copy_constructible<simple_pair<int, char*>>::value));
+ EXPECT_TRUE((
+ absl::is_trivially_copy_constructible<simple_pair<int, Trivial>>::value));
+ EXPECT_TRUE((absl::is_trivially_copy_constructible<
+ simple_pair<int, TrivialCopyCtor>>::value));
+
+ // Verify that types without trivial copy constructors are
+ // correctly marked as such.
+ EXPECT_FALSE(absl::is_trivially_copy_constructible<std::string>::value);
+ EXPECT_FALSE(absl::is_trivially_copy_constructible<std::vector<int>>::value);
+
+ // Verify that simple_pairs of types without trivial copy constructors
+ // are not marked as trivial.
+ EXPECT_FALSE((absl::is_trivially_copy_constructible<
+ simple_pair<int, std::string>>::value));
+ EXPECT_FALSE((absl::is_trivially_copy_constructible<
+ simple_pair<std::string, int>>::value));
+
+ // Verify that arrays are not
+ using int10 = int[10];
+ EXPECT_FALSE(absl::is_trivially_copy_constructible<int10>::value);
+}
+
+TEST(TypeTraitsTest, TestTrivialMoveAssign) {
+ // Verify that arithmetic types and pointers have trivial move
+ // assignment operators.
+ EXPECT_TRUE(absl::is_trivially_move_assignable<bool>::value);
+ EXPECT_TRUE(absl::is_trivially_move_assignable<char>::value);
+ EXPECT_TRUE(absl::is_trivially_move_assignable<unsigned char>::value);
+ EXPECT_TRUE(absl::is_trivially_move_assignable<signed char>::value);
+ EXPECT_TRUE(absl::is_trivially_move_assignable<wchar_t>::value);
+ EXPECT_TRUE(absl::is_trivially_move_assignable<int>::value);
+ EXPECT_TRUE(absl::is_trivially_move_assignable<unsigned int>::value);
+ EXPECT_TRUE(absl::is_trivially_move_assignable<int16_t>::value);
+ EXPECT_TRUE(absl::is_trivially_move_assignable<uint16_t>::value);
+ EXPECT_TRUE(absl::is_trivially_move_assignable<int64_t>::value);
+ EXPECT_TRUE(absl::is_trivially_move_assignable<uint64_t>::value);
+ EXPECT_TRUE(absl::is_trivially_move_assignable<float>::value);
+ EXPECT_TRUE(absl::is_trivially_move_assignable<double>::value);
+ EXPECT_TRUE(absl::is_trivially_move_assignable<long double>::value);
+ EXPECT_TRUE(absl::is_trivially_move_assignable<std::string*>::value);
+ EXPECT_TRUE(absl::is_trivially_move_assignable<Trivial*>::value);
+ EXPECT_TRUE(absl::is_trivially_move_assignable<const std::string*>::value);
+ EXPECT_TRUE(absl::is_trivially_move_assignable<const Trivial*>::value);
+ EXPECT_TRUE(absl::is_trivially_move_assignable<std::string**>::value);
+ EXPECT_TRUE(absl::is_trivially_move_assignable<Trivial**>::value);
+
+ // const qualified types are not assignable
+ EXPECT_FALSE(absl::is_trivially_move_assignable<const int>::value);
+
+ // types with compiler generated move assignment
+ EXPECT_TRUE(absl::is_trivially_move_assignable<Trivial>::value);
+ EXPECT_TRUE(absl::is_trivially_move_assignable<TrivialMoveAssign>::value);
+
+ // Verify that types without them (i.e. nontrivial or deleted) are not.
+ EXPECT_FALSE(absl::is_trivially_move_assignable<NontrivialCopyAssign>::value);
+ EXPECT_FALSE(absl::is_trivially_move_assignable<DeletedCopyAssign>::value);
+ EXPECT_FALSE(absl::is_trivially_move_assignable<NonCopyableOrMovable>::value);
+
+ // types with vtables
+ EXPECT_FALSE(absl::is_trivially_move_assignable<Base>::value);
+
+ // Verify that simple_pair is trivially assignable
+ EXPECT_TRUE(
+ (absl::is_trivially_move_assignable<simple_pair<int, char*>>::value));
+ EXPECT_TRUE(
+ (absl::is_trivially_move_assignable<simple_pair<int, Trivial>>::value));
+ EXPECT_TRUE((absl::is_trivially_move_assignable<
+ simple_pair<int, TrivialMoveAssign>>::value));
+
+ // Verify that types not trivially move assignable are
+ // correctly marked as such.
+ EXPECT_FALSE(absl::is_trivially_move_assignable<std::string>::value);
+ EXPECT_FALSE(absl::is_trivially_move_assignable<std::vector<int>>::value);
+
+ // Verify that simple_pairs of types not trivially move assignable
+ // are not marked as trivial.
+ EXPECT_FALSE((absl::is_trivially_move_assignable<
+ simple_pair<int, std::string>>::value));
+ EXPECT_FALSE((absl::is_trivially_move_assignable<
+ simple_pair<std::string, int>>::value));
+
+ // Verify that arrays are not trivially move assignable
+ using int10 = int[10];
+ EXPECT_FALSE(absl::is_trivially_move_assignable<int10>::value);
+
+ // Verify that references are handled correctly
+ EXPECT_TRUE(absl::is_trivially_move_assignable<Trivial&&>::value);
+ EXPECT_TRUE(absl::is_trivially_move_assignable<Trivial&>::value);
+}
+
+TEST(TypeTraitsTest, TestTrivialCopyAssign) {
+ // Verify that arithmetic types and pointers have trivial copy
+ // assignment operators.
+ EXPECT_TRUE(absl::is_trivially_copy_assignable<bool>::value);
+ EXPECT_TRUE(absl::is_trivially_copy_assignable<char>::value);
+ EXPECT_TRUE(absl::is_trivially_copy_assignable<unsigned char>::value);
+ EXPECT_TRUE(absl::is_trivially_copy_assignable<signed char>::value);
+ EXPECT_TRUE(absl::is_trivially_copy_assignable<wchar_t>::value);
+ EXPECT_TRUE(absl::is_trivially_copy_assignable<int>::value);
+ EXPECT_TRUE(absl::is_trivially_copy_assignable<unsigned int>::value);
+ EXPECT_TRUE(absl::is_trivially_copy_assignable<int16_t>::value);
+ EXPECT_TRUE(absl::is_trivially_copy_assignable<uint16_t>::value);
+ EXPECT_TRUE(absl::is_trivially_copy_assignable<int64_t>::value);
+ EXPECT_TRUE(absl::is_trivially_copy_assignable<uint64_t>::value);
+ EXPECT_TRUE(absl::is_trivially_copy_assignable<float>::value);
+ EXPECT_TRUE(absl::is_trivially_copy_assignable<double>::value);
+ EXPECT_TRUE(absl::is_trivially_copy_assignable<long double>::value);
+ EXPECT_TRUE(absl::is_trivially_copy_assignable<std::string*>::value);
+ EXPECT_TRUE(absl::is_trivially_copy_assignable<Trivial*>::value);
+ EXPECT_TRUE(absl::is_trivially_copy_assignable<const std::string*>::value);
+ EXPECT_TRUE(absl::is_trivially_copy_assignable<const Trivial*>::value);
+ EXPECT_TRUE(absl::is_trivially_copy_assignable<std::string**>::value);
+ EXPECT_TRUE(absl::is_trivially_copy_assignable<Trivial**>::value);
+
+ // const qualified types are not assignable
+ EXPECT_FALSE(absl::is_trivially_copy_assignable<const int>::value);
+
+ // types with compiler generated copy assignment
+ EXPECT_TRUE(absl::is_trivially_copy_assignable<Trivial>::value);
+ EXPECT_TRUE(absl::is_trivially_copy_assignable<TrivialCopyAssign>::value);
+
+ // Verify that types without them (i.e. nontrivial or deleted) are not.
+ EXPECT_FALSE(absl::is_trivially_copy_assignable<NontrivialCopyAssign>::value);
+ EXPECT_FALSE(absl::is_trivially_copy_assignable<DeletedCopyAssign>::value);
+ EXPECT_FALSE(absl::is_trivially_copy_assignable<MovableNonCopyable>::value);
+ EXPECT_FALSE(absl::is_trivially_copy_assignable<NonCopyableOrMovable>::value);
+
+ // types with vtables
+ EXPECT_FALSE(absl::is_trivially_copy_assignable<Base>::value);
+
+ // Verify that simple_pair is trivially assignable
+ EXPECT_TRUE(
+ (absl::is_trivially_copy_assignable<simple_pair<int, char*>>::value));
+ EXPECT_TRUE(
+ (absl::is_trivially_copy_assignable<simple_pair<int, Trivial>>::value));
+ EXPECT_TRUE((absl::is_trivially_copy_assignable<
+ simple_pair<int, TrivialCopyAssign>>::value));
+
+ // Verify that types not trivially copy assignable are
+ // correctly marked as such.
+ EXPECT_FALSE(absl::is_trivially_copy_assignable<std::string>::value);
+ EXPECT_FALSE(absl::is_trivially_copy_assignable<std::vector<int>>::value);
+
+ // Verify that simple_pairs of types not trivially copy assignable
+ // are not marked as trivial.
+ EXPECT_FALSE((absl::is_trivially_copy_assignable<
+ simple_pair<int, std::string>>::value));
+ EXPECT_FALSE((absl::is_trivially_copy_assignable<
+ simple_pair<std::string, int>>::value));
+
+ // Verify that arrays are not trivially copy assignable
+ using int10 = int[10];
+ EXPECT_FALSE(absl::is_trivially_copy_assignable<int10>::value);
+
+ // Verify that references are handled correctly
+ EXPECT_TRUE(absl::is_trivially_copy_assignable<Trivial&&>::value);
+ EXPECT_TRUE(absl::is_trivially_copy_assignable<Trivial&>::value);
+}
+
+TEST(TypeTraitsTest, TestTriviallyCopyable) {
+ // Verify that arithmetic types and pointers are trivially copyable.
+ EXPECT_TRUE(absl::type_traits_internal::is_trivially_copyable<bool>::value);
+ EXPECT_TRUE(absl::type_traits_internal::is_trivially_copyable<char>::value);
+ EXPECT_TRUE(
+ absl::type_traits_internal::is_trivially_copyable<unsigned char>::value);
+ EXPECT_TRUE(
+ absl::type_traits_internal::is_trivially_copyable<signed char>::value);
+ EXPECT_TRUE(
+ absl::type_traits_internal::is_trivially_copyable<wchar_t>::value);
+ EXPECT_TRUE(absl::type_traits_internal::is_trivially_copyable<int>::value);
+ EXPECT_TRUE(
+ absl::type_traits_internal::is_trivially_copyable<unsigned int>::value);
+ EXPECT_TRUE(
+ absl::type_traits_internal::is_trivially_copyable<int16_t>::value);
+ EXPECT_TRUE(
+ absl::type_traits_internal::is_trivially_copyable<uint16_t>::value);
+ EXPECT_TRUE(
+ absl::type_traits_internal::is_trivially_copyable<int64_t>::value);
+ EXPECT_TRUE(
+ absl::type_traits_internal::is_trivially_copyable<uint64_t>::value);
+ EXPECT_TRUE(absl::type_traits_internal::is_trivially_copyable<float>::value);
+ EXPECT_TRUE(absl::type_traits_internal::is_trivially_copyable<double>::value);
+ EXPECT_TRUE(
+ absl::type_traits_internal::is_trivially_copyable<long double>::value);
+ EXPECT_TRUE(
+ absl::type_traits_internal::is_trivially_copyable<std::string*>::value);
+ EXPECT_TRUE(
+ absl::type_traits_internal::is_trivially_copyable<Trivial*>::value);
+ EXPECT_TRUE(absl::type_traits_internal::is_trivially_copyable<
+ const std::string*>::value);
+ EXPECT_TRUE(
+ absl::type_traits_internal::is_trivially_copyable<const Trivial*>::value);
+ EXPECT_TRUE(
+ absl::type_traits_internal::is_trivially_copyable<std::string**>::value);
+ EXPECT_TRUE(
+ absl::type_traits_internal::is_trivially_copyable<Trivial**>::value);
+
+ // const qualified types are not assignable but are constructible
+ EXPECT_TRUE(
+ absl::type_traits_internal::is_trivially_copyable<const int>::value);
+
+ // Trivial copy constructor/assignment and destructor.
+ EXPECT_TRUE(
+ absl::type_traits_internal::is_trivially_copyable<Trivial>::value);
+ // Trivial copy assignment, but non-trivial copy constructor/destructor.
+ EXPECT_FALSE(absl::type_traits_internal::is_trivially_copyable<
+ TrivialCopyAssign>::value);
+ // Trivial copy constructor, but non-trivial assignment.
+ EXPECT_FALSE(absl::type_traits_internal::is_trivially_copyable<
+ TrivialCopyCtor>::value);
+
+ // Types with a non-trivial copy constructor/assignment
+ EXPECT_FALSE(absl::type_traits_internal::is_trivially_copyable<
+ NontrivialCopyCtor>::value);
+ EXPECT_FALSE(absl::type_traits_internal::is_trivially_copyable<
+ NontrivialCopyAssign>::value);
+
+ // Types without copy constructor/assignment, but with move
+ // MSVC disagrees with other compilers about this:
+ // EXPECT_TRUE(absl::type_traits_internal::is_trivially_copyable<
+ // MovableNonCopyable>::value);
+
+ // Types without copy/move constructor/assignment
+ EXPECT_FALSE(absl::type_traits_internal::is_trivially_copyable<
+ NonCopyableOrMovable>::value);
+
+ // No copy assign, but has trivial copy constructor.
+ EXPECT_TRUE(absl::type_traits_internal::is_trivially_copyable<
+ DeletedCopyAssign>::value);
+
+ // types with vtables
+ EXPECT_FALSE(absl::type_traits_internal::is_trivially_copyable<Base>::value);
+
+ // Verify that simple_pair is trivially copyable if members are
+ EXPECT_TRUE((absl::type_traits_internal::is_trivially_copyable<
+ simple_pair<int, char*>>::value));
+ EXPECT_TRUE((absl::type_traits_internal::is_trivially_copyable<
+ simple_pair<int, Trivial>>::value));
+
+ // Verify that types not trivially copyable are
+ // correctly marked as such.
+ EXPECT_FALSE(
+ absl::type_traits_internal::is_trivially_copyable<std::string>::value);
+ EXPECT_FALSE(absl::type_traits_internal::is_trivially_copyable<
+ std::vector<int>>::value);
+
+ // Verify that simple_pairs of types not trivially copyable
+ // are not marked as trivial.
+ EXPECT_FALSE((absl::type_traits_internal::is_trivially_copyable<
+ simple_pair<int, std::string>>::value));
+ EXPECT_FALSE((absl::type_traits_internal::is_trivially_copyable<
+ simple_pair<std::string, int>>::value));
+ EXPECT_FALSE((absl::type_traits_internal::is_trivially_copyable<
+ simple_pair<int, TrivialCopyAssign>>::value));
+
+ // Verify that arrays of trivially copyable types are trivially copyable
+ using int10 = int[10];
+ EXPECT_TRUE(absl::type_traits_internal::is_trivially_copyable<int10>::value);
+ using int10x10 = int[10][10];
+ EXPECT_TRUE(
+ absl::type_traits_internal::is_trivially_copyable<int10x10>::value);
+
+ // Verify that references are handled correctly
+ EXPECT_FALSE(
+ absl::type_traits_internal::is_trivially_copyable<Trivial&&>::value);
+ EXPECT_FALSE(
+ absl::type_traits_internal::is_trivially_copyable<Trivial&>::value);
+}
+
+#define ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(trait_name, ...) \
+ EXPECT_TRUE((std::is_same<typename std::trait_name<__VA_ARGS__>::type, \
+ absl::trait_name##_t<__VA_ARGS__>>::value))
+
+TEST(TypeTraitsTest, TestRemoveCVAliases) {
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(remove_cv, int);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(remove_cv, const int);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(remove_cv, volatile int);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(remove_cv, const volatile int);
+
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(remove_const, int);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(remove_const, const int);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(remove_const, volatile int);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(remove_const, const volatile int);
+
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(remove_volatile, int);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(remove_volatile, const int);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(remove_volatile, volatile int);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(remove_volatile, const volatile int);
+}
+
+TEST(TypeTraitsTest, TestAddCVAliases) {
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(add_cv, int);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(add_cv, const int);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(add_cv, volatile int);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(add_cv, const volatile int);
+
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(add_const, int);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(add_const, const int);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(add_const, volatile int);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(add_const, const volatile int);
+
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(add_volatile, int);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(add_volatile, const int);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(add_volatile, volatile int);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(add_volatile, const volatile int);
+}
+
+TEST(TypeTraitsTest, TestReferenceAliases) {
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(remove_reference, int);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(remove_reference, volatile int);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(remove_reference, int&);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(remove_reference, volatile int&);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(remove_reference, int&&);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(remove_reference, volatile int&&);
+
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(add_lvalue_reference, int);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(add_lvalue_reference, volatile int);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(add_lvalue_reference, int&);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(add_lvalue_reference, volatile int&);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(add_lvalue_reference, int&&);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(add_lvalue_reference, volatile int&&);
+
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(add_rvalue_reference, int);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(add_rvalue_reference, volatile int);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(add_rvalue_reference, int&);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(add_rvalue_reference, volatile int&);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(add_rvalue_reference, int&&);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(add_rvalue_reference, volatile int&&);
+}
+
+TEST(TypeTraitsTest, TestPointerAliases) {
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(remove_pointer, int*);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(remove_pointer, volatile int*);
+
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(add_pointer, int);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(add_pointer, volatile int);
+}
+
+TEST(TypeTraitsTest, TestSignednessAliases) {
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(make_signed, int);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(make_signed, volatile int);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(make_signed, unsigned);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(make_signed, volatile unsigned);
+
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(make_unsigned, int);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(make_unsigned, volatile int);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(make_unsigned, unsigned);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(make_unsigned, volatile unsigned);
+}
+
+TEST(TypeTraitsTest, TestExtentAliases) {
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(remove_extent, int[]);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(remove_extent, int[1]);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(remove_extent, int[1][1]);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(remove_extent, int[][1]);
+
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(remove_all_extents, int[]);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(remove_all_extents, int[1]);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(remove_all_extents, int[1][1]);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(remove_all_extents, int[][1]);
+}
+
+TEST(TypeTraitsTest, TestAlignedStorageAlias) {
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 1);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 2);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 3);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 4);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 5);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 6);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 7);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 8);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 9);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 10);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 11);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 12);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 13);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 14);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 15);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 16);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 17);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 18);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 19);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 20);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 21);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 22);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 23);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 24);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 25);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 26);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 27);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 28);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 29);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 30);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 31);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 32);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 33);
+
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 1, 128);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 2, 128);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 3, 128);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 4, 128);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 5, 128);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 6, 128);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 7, 128);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 8, 128);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 9, 128);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 10, 128);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 11, 128);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 12, 128);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 13, 128);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 14, 128);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 15, 128);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 16, 128);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 17, 128);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 18, 128);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 19, 128);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 20, 128);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 21, 128);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 22, 128);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 23, 128);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 24, 128);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 25, 128);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 26, 128);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 27, 128);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 28, 128);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 29, 128);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 30, 128);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 31, 128);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 32, 128);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 33, 128);
+}
+
+TEST(TypeTraitsTest, TestDecay) {
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(decay, int);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(decay, const int);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(decay, volatile int);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(decay, const volatile int);
+
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(decay, int&);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(decay, const int&);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(decay, volatile int&);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(decay, const volatile int&);
+
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(decay, int&);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(decay, const int&);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(decay, volatile int&);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(decay, const volatile int&);
+
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(decay, int[1]);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(decay, int[1][1]);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(decay, int[][1]);
+
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(decay, int());
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(decay, int(float)); // NOLINT
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(decay, int(char, ...)); // NOLINT
+}
+
+struct TypeA {};
+struct TypeB {};
+struct TypeC {};
+struct TypeD {};
+
+template <typename T>
+struct Wrap {};
+
+enum class TypeEnum { A, B, C, D };
+
+struct GetTypeT {
+ template <typename T,
+ absl::enable_if_t<std::is_same<T, TypeA>::value, int> = 0>
+ TypeEnum operator()(Wrap<T>) const {
+ return TypeEnum::A;
+ }
+
+ template <typename T,
+ absl::enable_if_t<std::is_same<T, TypeB>::value, int> = 0>
+ TypeEnum operator()(Wrap<T>) const {
+ return TypeEnum::B;
+ }
+
+ template <typename T,
+ absl::enable_if_t<std::is_same<T, TypeC>::value, int> = 0>
+ TypeEnum operator()(Wrap<T>) const {
+ return TypeEnum::C;
+ }
+
+ // NOTE: TypeD is intentionally not handled
+} constexpr GetType = {};
+
+TEST(TypeTraitsTest, TestEnableIf) {
+ EXPECT_EQ(TypeEnum::A, GetType(Wrap<TypeA>()));
+ EXPECT_EQ(TypeEnum::B, GetType(Wrap<TypeB>()));
+ EXPECT_EQ(TypeEnum::C, GetType(Wrap<TypeC>()));
+}
+
+TEST(TypeTraitsTest, TestConditional) {
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(conditional, true, int, char);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(conditional, false, int, char);
+}
+
+// TODO(calabrese) Check with specialized std::common_type
+TEST(TypeTraitsTest, TestCommonType) {
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(common_type, int);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(common_type, int, char);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(common_type, int, char, int);
+
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(common_type, int&);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(common_type, int, char&);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(common_type, int, char, int&);
+}
+
+TEST(TypeTraitsTest, TestUnderlyingType) {
+ enum class enum_char : char {};
+ enum class enum_long_long : long long {}; // NOLINT(runtime/int)
+
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(underlying_type, enum_char);
+ ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(underlying_type, enum_long_long);
+}
+
+struct GetTypeExtT {
+ template <typename T>
+ absl::result_of_t<const GetTypeT&(T)> operator()(T&& arg) const {
+ return GetType(std::forward<T>(arg));
+ }
+
+ TypeEnum operator()(Wrap<TypeD>) const { return TypeEnum::D; }
+} constexpr GetTypeExt = {};
+
+TEST(TypeTraitsTest, TestResultOf) {
+ EXPECT_EQ(TypeEnum::A, GetTypeExt(Wrap<TypeA>()));
+ EXPECT_EQ(TypeEnum::B, GetTypeExt(Wrap<TypeB>()));
+ EXPECT_EQ(TypeEnum::C, GetTypeExt(Wrap<TypeC>()));
+ EXPECT_EQ(TypeEnum::D, GetTypeExt(Wrap<TypeD>()));
+}
+
+template <typename T>
+bool TestCopyAssign() {
+ return absl::is_copy_assignable<T>::value ==
+ std::is_copy_assignable<T>::value;
+}
+
+TEST(TypeTraitsTest, IsCopyAssignable) {
+ EXPECT_TRUE(TestCopyAssign<int>());
+ EXPECT_TRUE(TestCopyAssign<int&>());
+ EXPECT_TRUE(TestCopyAssign<int&&>());
+
+ struct S {};
+ EXPECT_TRUE(TestCopyAssign<S>());
+ EXPECT_TRUE(TestCopyAssign<S&>());
+ EXPECT_TRUE(TestCopyAssign<S&&>());
+
+ class C {
+ public:
+ explicit C(C* c) : c_(c) {}
+ ~C() { delete c_; }
+
+ private:
+ C* c_;
+ };
+ EXPECT_TRUE(TestCopyAssign<C>());
+ EXPECT_TRUE(TestCopyAssign<C&>());
+ EXPECT_TRUE(TestCopyAssign<C&&>());
+
+ // Reason for ifndef: add_lvalue_reference<T> in libc++ breaks for these cases
+#ifndef _LIBCPP_VERSION
+ EXPECT_TRUE(TestCopyAssign<int()>());
+ EXPECT_TRUE(TestCopyAssign<int(int) const>());
+ EXPECT_TRUE(TestCopyAssign<int(...) volatile&>());
+ EXPECT_TRUE(TestCopyAssign<int(int, ...) const volatile&&>());
+#endif // _LIBCPP_VERSION
+}
+
+template <typename T>
+bool TestMoveAssign() {
+ return absl::is_move_assignable<T>::value ==
+ std::is_move_assignable<T>::value;
+}
+
+TEST(TypeTraitsTest, IsMoveAssignable) {
+ EXPECT_TRUE(TestMoveAssign<int>());
+ EXPECT_TRUE(TestMoveAssign<int&>());
+ EXPECT_TRUE(TestMoveAssign<int&&>());
+
+ struct S {};
+ EXPECT_TRUE(TestMoveAssign<S>());
+ EXPECT_TRUE(TestMoveAssign<S&>());
+ EXPECT_TRUE(TestMoveAssign<S&&>());
+
+ class C {
+ public:
+ explicit C(C* c) : c_(c) {}
+ ~C() { delete c_; }
+ void operator=(const C&) = delete;
+ void operator=(C&&) = delete;
+
+ private:
+ C* c_;
+ };
+ EXPECT_TRUE(TestMoveAssign<C>());
+ EXPECT_TRUE(TestMoveAssign<C&>());
+ EXPECT_TRUE(TestMoveAssign<C&&>());
+
+ // Reason for ifndef: add_lvalue_reference<T> in libc++ breaks for these cases
+#ifndef _LIBCPP_VERSION
+ EXPECT_TRUE(TestMoveAssign<int()>());
+ EXPECT_TRUE(TestMoveAssign<int(int) const>());
+ EXPECT_TRUE(TestMoveAssign<int(...) volatile&>());
+ EXPECT_TRUE(TestMoveAssign<int(int, ...) const volatile&&>());
+#endif // _LIBCPP_VERSION
+}
+
+namespace adl_namespace {
+
+struct DeletedSwap {
+};
+
+void swap(DeletedSwap&, DeletedSwap&) = delete;
+
+struct SpecialNoexceptSwap {
+ SpecialNoexceptSwap(SpecialNoexceptSwap&&) {}
+ SpecialNoexceptSwap& operator=(SpecialNoexceptSwap&&) { return *this; }
+ ~SpecialNoexceptSwap() = default;
+};
+
+void swap(SpecialNoexceptSwap&, SpecialNoexceptSwap&) noexcept {}
+
+} // namespace adl_namespace
+
+TEST(TypeTraitsTest, IsSwappable) {
+ using absl::type_traits_internal::IsSwappable;
+ using absl::type_traits_internal::StdSwapIsUnconstrained;
+
+ EXPECT_TRUE(IsSwappable<int>::value);
+
+ struct S {};
+ EXPECT_TRUE(IsSwappable<S>::value);
+
+ struct NoConstruct {
+ NoConstruct(NoConstruct&&) = delete;
+ NoConstruct& operator=(NoConstruct&&) { return *this; }
+ ~NoConstruct() = default;
+ };
+
+ EXPECT_EQ(IsSwappable<NoConstruct>::value, StdSwapIsUnconstrained::value);
+ struct NoAssign {
+ NoAssign(NoAssign&&) {}
+ NoAssign& operator=(NoAssign&&) = delete;
+ ~NoAssign() = default;
+ };
+
+ EXPECT_EQ(IsSwappable<NoAssign>::value, StdSwapIsUnconstrained::value);
+
+ EXPECT_FALSE(IsSwappable<adl_namespace::DeletedSwap>::value);
+
+ EXPECT_TRUE(IsSwappable<adl_namespace::SpecialNoexceptSwap>::value);
+}
+
+TEST(TypeTraitsTest, IsNothrowSwappable) {
+ using absl::type_traits_internal::IsNothrowSwappable;
+ using absl::type_traits_internal::StdSwapIsUnconstrained;
+
+ EXPECT_TRUE(IsNothrowSwappable<int>::value);
+
+ struct NonNoexceptMoves {
+ NonNoexceptMoves(NonNoexceptMoves&&) {}
+ NonNoexceptMoves& operator=(NonNoexceptMoves&&) { return *this; }
+ ~NonNoexceptMoves() = default;
+ };
+
+ EXPECT_FALSE(IsNothrowSwappable<NonNoexceptMoves>::value);
+
+ struct NoConstruct {
+ NoConstruct(NoConstruct&&) = delete;
+ NoConstruct& operator=(NoConstruct&&) { return *this; }
+ ~NoConstruct() = default;
+ };
+
+ EXPECT_FALSE(IsNothrowSwappable<NoConstruct>::value);
+
+ struct NoAssign {
+ NoAssign(NoAssign&&) {}
+ NoAssign& operator=(NoAssign&&) = delete;
+ ~NoAssign() = default;
+ };
+
+ EXPECT_FALSE(IsNothrowSwappable<NoAssign>::value);
+
+ EXPECT_FALSE(IsNothrowSwappable<adl_namespace::DeletedSwap>::value);
+
+ EXPECT_TRUE(IsNothrowSwappable<adl_namespace::SpecialNoexceptSwap>::value);
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/numeric/BUILD.bazel b/third_party/abseil/src/absl/numeric/BUILD.bazel
new file mode 100644
index 0000000..f808f5d
--- /dev/null
+++ b/third_party/abseil/src/absl/numeric/BUILD.bazel
@@ -0,0 +1,74 @@
+# Copyright 2018 The Abseil Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+load("@rules_cc//cc:defs.bzl", "cc_library", "cc_test")
+load(
+ "//absl:copts/configure_copts.bzl",
+ "ABSL_DEFAULT_COPTS",
+ "ABSL_DEFAULT_LINKOPTS",
+ "ABSL_TEST_COPTS",
+)
+
+package(default_visibility = ["//visibility:public"])
+
+licenses(["notice"])
+
+cc_library(
+ name = "int128",
+ srcs = [
+ "int128.cc",
+ "int128_have_intrinsic.inc",
+ "int128_no_intrinsic.inc",
+ ],
+ hdrs = ["int128.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ "//absl/base:bits",
+ "//absl/base:config",
+ "//absl/base:core_headers",
+ ],
+)
+
+cc_test(
+ name = "int128_test",
+ size = "small",
+ srcs = [
+ "int128_stream_test.cc",
+ "int128_test.cc",
+ ],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":int128",
+ "//absl/base",
+ "//absl/base:core_headers",
+ "//absl/hash:hash_testing",
+ "//absl/meta:type_traits",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "int128_benchmark",
+ srcs = ["int128_benchmark.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ tags = ["benchmark"],
+ deps = [
+ ":int128",
+ "//absl/base:config",
+ "@com_github_google_benchmark//:benchmark_main",
+ ],
+)
diff --git a/third_party/abseil/src/absl/numeric/CMakeLists.txt b/third_party/abseil/src/absl/numeric/CMakeLists.txt
new file mode 100644
index 0000000..1e12d80
--- /dev/null
+++ b/third_party/abseil/src/absl/numeric/CMakeLists.txt
@@ -0,0 +1,61 @@
+#
+# Copyright 2017 The Abseil Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+absl_cc_library(
+ NAME
+ int128
+ HDRS
+ "int128.h"
+ SRCS
+ "int128.cc"
+ "int128_have_intrinsic.inc"
+ "int128_no_intrinsic.inc"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::bits
+ absl::config
+ absl::core_headers
+ PUBLIC
+)
+
+absl_cc_test(
+ NAME
+ int128_test
+ SRCS
+ "int128_stream_test.cc"
+ "int128_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::int128
+ absl::base
+ absl::core_headers
+ absl::hash_testing
+ absl::type_traits
+ gmock_main
+)
+
+# component target
+absl_cc_library(
+ NAME
+ numeric
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::int128
+ PUBLIC
+)
diff --git a/third_party/abseil/src/absl/numeric/int128.cc b/third_party/abseil/src/absl/numeric/int128.cc
new file mode 100644
index 0000000..e21e5e9
--- /dev/null
+++ b/third_party/abseil/src/absl/numeric/int128.cc
@@ -0,0 +1,390 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/numeric/int128.h"
+
+#include <stddef.h>
+
+#include <cassert>
+#include <iomanip>
+#include <ostream> // NOLINT(readability/streams)
+#include <sstream>
+#include <string>
+#include <type_traits>
+
+#include "absl/base/internal/bits.h"
+#include "absl/base/optimization.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+ABSL_DLL const uint128 kuint128max = MakeUint128(
+ std::numeric_limits<uint64_t>::max(), std::numeric_limits<uint64_t>::max());
+
+namespace {
+
+// Returns the 0-based position of the last set bit (i.e., most significant bit)
+// in the given uint128. The argument is not 0.
+//
+// For example:
+// Given: 5 (decimal) == 101 (binary)
+// Returns: 2
+inline ABSL_ATTRIBUTE_ALWAYS_INLINE int Fls128(uint128 n) {
+ if (uint64_t hi = Uint128High64(n)) {
+ ABSL_INTERNAL_ASSUME(hi != 0);
+ return 127 - base_internal::CountLeadingZeros64(hi);
+ }
+ const uint64_t low = Uint128Low64(n);
+ ABSL_INTERNAL_ASSUME(low != 0);
+ return 63 - base_internal::CountLeadingZeros64(low);
+}
+
+// Long division/modulo for uint128 implemented using the shift-subtract
+// division algorithm adapted from:
+// https://stackoverflow.com/questions/5386377/division-without-using
+inline void DivModImpl(uint128 dividend, uint128 divisor, uint128* quotient_ret,
+ uint128* remainder_ret) {
+ assert(divisor != 0);
+
+ if (divisor > dividend) {
+ *quotient_ret = 0;
+ *remainder_ret = dividend;
+ return;
+ }
+
+ if (divisor == dividend) {
+ *quotient_ret = 1;
+ *remainder_ret = 0;
+ return;
+ }
+
+ uint128 denominator = divisor;
+ uint128 quotient = 0;
+
+ // Left aligns the MSB of the denominator and the dividend.
+ const int shift = Fls128(dividend) - Fls128(denominator);
+ denominator <<= shift;
+
+ // Uses shift-subtract algorithm to divide dividend by denominator. The
+ // remainder will be left in dividend.
+ for (int i = 0; i <= shift; ++i) {
+ quotient <<= 1;
+ if (dividend >= denominator) {
+ dividend -= denominator;
+ quotient |= 1;
+ }
+ denominator >>= 1;
+ }
+
+ *quotient_ret = quotient;
+ *remainder_ret = dividend;
+}
+
+template <typename T>
+uint128 MakeUint128FromFloat(T v) {
+ static_assert(std::is_floating_point<T>::value, "");
+
+ // Rounding behavior is towards zero, same as for built-in types.
+
+ // Undefined behavior if v is NaN or cannot fit into uint128.
+ assert(std::isfinite(v) && v > -1 &&
+ (std::numeric_limits<T>::max_exponent <= 128 ||
+ v < std::ldexp(static_cast<T>(1), 128)));
+
+ if (v >= std::ldexp(static_cast<T>(1), 64)) {
+ uint64_t hi = static_cast<uint64_t>(std::ldexp(v, -64));
+ uint64_t lo = static_cast<uint64_t>(v - std::ldexp(static_cast<T>(hi), 64));
+ return MakeUint128(hi, lo);
+ }
+
+ return MakeUint128(0, static_cast<uint64_t>(v));
+}
+
+#if defined(__clang__) && !defined(__SSE3__)
+// Workaround for clang bug: https://bugs.llvm.org/show_bug.cgi?id=38289
+// Casting from long double to uint64_t is miscompiled and drops bits.
+// It is more work, so only use when we need the workaround.
+uint128 MakeUint128FromFloat(long double v) {
+ // Go 50 bits at a time, that fits in a double
+ static_assert(std::numeric_limits<double>::digits >= 50, "");
+ static_assert(std::numeric_limits<long double>::digits <= 150, "");
+ // Undefined behavior if v is not finite or cannot fit into uint128.
+ assert(std::isfinite(v) && v > -1 && v < std::ldexp(1.0L, 128));
+
+ v = std::ldexp(v, -100);
+ uint64_t w0 = static_cast<uint64_t>(static_cast<double>(std::trunc(v)));
+ v = std::ldexp(v - static_cast<double>(w0), 50);
+ uint64_t w1 = static_cast<uint64_t>(static_cast<double>(std::trunc(v)));
+ v = std::ldexp(v - static_cast<double>(w1), 50);
+ uint64_t w2 = static_cast<uint64_t>(static_cast<double>(std::trunc(v)));
+ return (static_cast<uint128>(w0) << 100) | (static_cast<uint128>(w1) << 50) |
+ static_cast<uint128>(w2);
+}
+#endif // __clang__ && !__SSE3__
+} // namespace
+
+uint128::uint128(float v) : uint128(MakeUint128FromFloat(v)) {}
+uint128::uint128(double v) : uint128(MakeUint128FromFloat(v)) {}
+uint128::uint128(long double v) : uint128(MakeUint128FromFloat(v)) {}
+
+uint128 operator/(uint128 lhs, uint128 rhs) {
+#if defined(ABSL_HAVE_INTRINSIC_INT128)
+ return static_cast<unsigned __int128>(lhs) /
+ static_cast<unsigned __int128>(rhs);
+#else // ABSL_HAVE_INTRINSIC_INT128
+ uint128 quotient = 0;
+ uint128 remainder = 0;
+ DivModImpl(lhs, rhs, "ient, &remainder);
+ return quotient;
+#endif // ABSL_HAVE_INTRINSIC_INT128
+}
+uint128 operator%(uint128 lhs, uint128 rhs) {
+#if defined(ABSL_HAVE_INTRINSIC_INT128)
+ return static_cast<unsigned __int128>(lhs) %
+ static_cast<unsigned __int128>(rhs);
+#else // ABSL_HAVE_INTRINSIC_INT128
+ uint128 quotient = 0;
+ uint128 remainder = 0;
+ DivModImpl(lhs, rhs, "ient, &remainder);
+ return remainder;
+#endif // ABSL_HAVE_INTRINSIC_INT128
+}
+
+namespace {
+
+std::string Uint128ToFormattedString(uint128 v, std::ios_base::fmtflags flags) {
+ // Select a divisor which is the largest power of the base < 2^64.
+ uint128 div;
+ int div_base_log;
+ switch (flags & std::ios::basefield) {
+ case std::ios::hex:
+ div = 0x1000000000000000; // 16^15
+ div_base_log = 15;
+ break;
+ case std::ios::oct:
+ div = 01000000000000000000000; // 8^21
+ div_base_log = 21;
+ break;
+ default: // std::ios::dec
+ div = 10000000000000000000u; // 10^19
+ div_base_log = 19;
+ break;
+ }
+
+ // Now piece together the uint128 representation from three chunks of the
+ // original value, each less than "div" and therefore representable as a
+ // uint64_t.
+ std::ostringstream os;
+ std::ios_base::fmtflags copy_mask =
+ std::ios::basefield | std::ios::showbase | std::ios::uppercase;
+ os.setf(flags & copy_mask, copy_mask);
+ uint128 high = v;
+ uint128 low;
+ DivModImpl(high, div, &high, &low);
+ uint128 mid;
+ DivModImpl(high, div, &high, &mid);
+ if (Uint128Low64(high) != 0) {
+ os << Uint128Low64(high);
+ os << std::noshowbase << std::setfill('0') << std::setw(div_base_log);
+ os << Uint128Low64(mid);
+ os << std::setw(div_base_log);
+ } else if (Uint128Low64(mid) != 0) {
+ os << Uint128Low64(mid);
+ os << std::noshowbase << std::setfill('0') << std::setw(div_base_log);
+ }
+ os << Uint128Low64(low);
+ return os.str();
+}
+
+} // namespace
+
+std::ostream& operator<<(std::ostream& os, uint128 v) {
+ std::ios_base::fmtflags flags = os.flags();
+ std::string rep = Uint128ToFormattedString(v, flags);
+
+ // Add the requisite padding.
+ std::streamsize width = os.width(0);
+ if (static_cast<size_t>(width) > rep.size()) {
+ std::ios::fmtflags adjustfield = flags & std::ios::adjustfield;
+ if (adjustfield == std::ios::left) {
+ rep.append(width - rep.size(), os.fill());
+ } else if (adjustfield == std::ios::internal &&
+ (flags & std::ios::showbase) &&
+ (flags & std::ios::basefield) == std::ios::hex && v != 0) {
+ rep.insert(2, width - rep.size(), os.fill());
+ } else {
+ rep.insert(0, width - rep.size(), os.fill());
+ }
+ }
+
+ return os << rep;
+}
+
+namespace {
+
+uint128 UnsignedAbsoluteValue(int128 v) {
+ // Cast to uint128 before possibly negating because -Int128Min() is undefined.
+ return Int128High64(v) < 0 ? -uint128(v) : uint128(v);
+}
+
+} // namespace
+
+#if !defined(ABSL_HAVE_INTRINSIC_INT128)
+namespace {
+
+template <typename T>
+int128 MakeInt128FromFloat(T v) {
+ // Conversion when v is NaN or cannot fit into int128 would be undefined
+ // behavior if using an intrinsic 128-bit integer.
+ assert(std::isfinite(v) && (std::numeric_limits<T>::max_exponent <= 127 ||
+ (v >= -std::ldexp(static_cast<T>(1), 127) &&
+ v < std::ldexp(static_cast<T>(1), 127))));
+
+ // We must convert the absolute value and then negate as needed, because
+ // floating point types are typically sign-magnitude. Otherwise, the
+ // difference between the high and low 64 bits when interpreted as two's
+ // complement overwhelms the precision of the mantissa.
+ uint128 result = v < 0 ? -MakeUint128FromFloat(-v) : MakeUint128FromFloat(v);
+ return MakeInt128(int128_internal::BitCastToSigned(Uint128High64(result)),
+ Uint128Low64(result));
+}
+
+} // namespace
+
+int128::int128(float v) : int128(MakeInt128FromFloat(v)) {}
+int128::int128(double v) : int128(MakeInt128FromFloat(v)) {}
+int128::int128(long double v) : int128(MakeInt128FromFloat(v)) {}
+
+int128 operator/(int128 lhs, int128 rhs) {
+ assert(lhs != Int128Min() || rhs != -1); // UB on two's complement.
+
+ uint128 quotient = 0;
+ uint128 remainder = 0;
+ DivModImpl(UnsignedAbsoluteValue(lhs), UnsignedAbsoluteValue(rhs),
+ "ient, &remainder);
+ if ((Int128High64(lhs) < 0) != (Int128High64(rhs) < 0)) quotient = -quotient;
+ return MakeInt128(int128_internal::BitCastToSigned(Uint128High64(quotient)),
+ Uint128Low64(quotient));
+}
+
+int128 operator%(int128 lhs, int128 rhs) {
+ assert(lhs != Int128Min() || rhs != -1); // UB on two's complement.
+
+ uint128 quotient = 0;
+ uint128 remainder = 0;
+ DivModImpl(UnsignedAbsoluteValue(lhs), UnsignedAbsoluteValue(rhs),
+ "ient, &remainder);
+ if (Int128High64(lhs) < 0) remainder = -remainder;
+ return MakeInt128(int128_internal::BitCastToSigned(Uint128High64(remainder)),
+ Uint128Low64(remainder));
+}
+#endif // ABSL_HAVE_INTRINSIC_INT128
+
+std::ostream& operator<<(std::ostream& os, int128 v) {
+ std::ios_base::fmtflags flags = os.flags();
+ std::string rep;
+
+ // Add the sign if needed.
+ bool print_as_decimal =
+ (flags & std::ios::basefield) == std::ios::dec ||
+ (flags & std::ios::basefield) == std::ios_base::fmtflags();
+ if (print_as_decimal) {
+ if (Int128High64(v) < 0) {
+ rep = "-";
+ } else if (flags & std::ios::showpos) {
+ rep = "+";
+ }
+ }
+
+ rep.append(Uint128ToFormattedString(
+ print_as_decimal ? UnsignedAbsoluteValue(v) : uint128(v), os.flags()));
+
+ // Add the requisite padding.
+ std::streamsize width = os.width(0);
+ if (static_cast<size_t>(width) > rep.size()) {
+ switch (flags & std::ios::adjustfield) {
+ case std::ios::left:
+ rep.append(width - rep.size(), os.fill());
+ break;
+ case std::ios::internal:
+ if (print_as_decimal && (rep[0] == '+' || rep[0] == '-')) {
+ rep.insert(1, width - rep.size(), os.fill());
+ } else if ((flags & std::ios::basefield) == std::ios::hex &&
+ (flags & std::ios::showbase) && v != 0) {
+ rep.insert(2, width - rep.size(), os.fill());
+ } else {
+ rep.insert(0, width - rep.size(), os.fill());
+ }
+ break;
+ default: // std::ios::right
+ rep.insert(0, width - rep.size(), os.fill());
+ break;
+ }
+ }
+
+ return os << rep;
+}
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+namespace std {
+constexpr bool numeric_limits<absl::uint128>::is_specialized;
+constexpr bool numeric_limits<absl::uint128>::is_signed;
+constexpr bool numeric_limits<absl::uint128>::is_integer;
+constexpr bool numeric_limits<absl::uint128>::is_exact;
+constexpr bool numeric_limits<absl::uint128>::has_infinity;
+constexpr bool numeric_limits<absl::uint128>::has_quiet_NaN;
+constexpr bool numeric_limits<absl::uint128>::has_signaling_NaN;
+constexpr float_denorm_style numeric_limits<absl::uint128>::has_denorm;
+constexpr bool numeric_limits<absl::uint128>::has_denorm_loss;
+constexpr float_round_style numeric_limits<absl::uint128>::round_style;
+constexpr bool numeric_limits<absl::uint128>::is_iec559;
+constexpr bool numeric_limits<absl::uint128>::is_bounded;
+constexpr bool numeric_limits<absl::uint128>::is_modulo;
+constexpr int numeric_limits<absl::uint128>::digits;
+constexpr int numeric_limits<absl::uint128>::digits10;
+constexpr int numeric_limits<absl::uint128>::max_digits10;
+constexpr int numeric_limits<absl::uint128>::radix;
+constexpr int numeric_limits<absl::uint128>::min_exponent;
+constexpr int numeric_limits<absl::uint128>::min_exponent10;
+constexpr int numeric_limits<absl::uint128>::max_exponent;
+constexpr int numeric_limits<absl::uint128>::max_exponent10;
+constexpr bool numeric_limits<absl::uint128>::traps;
+constexpr bool numeric_limits<absl::uint128>::tinyness_before;
+
+constexpr bool numeric_limits<absl::int128>::is_specialized;
+constexpr bool numeric_limits<absl::int128>::is_signed;
+constexpr bool numeric_limits<absl::int128>::is_integer;
+constexpr bool numeric_limits<absl::int128>::is_exact;
+constexpr bool numeric_limits<absl::int128>::has_infinity;
+constexpr bool numeric_limits<absl::int128>::has_quiet_NaN;
+constexpr bool numeric_limits<absl::int128>::has_signaling_NaN;
+constexpr float_denorm_style numeric_limits<absl::int128>::has_denorm;
+constexpr bool numeric_limits<absl::int128>::has_denorm_loss;
+constexpr float_round_style numeric_limits<absl::int128>::round_style;
+constexpr bool numeric_limits<absl::int128>::is_iec559;
+constexpr bool numeric_limits<absl::int128>::is_bounded;
+constexpr bool numeric_limits<absl::int128>::is_modulo;
+constexpr int numeric_limits<absl::int128>::digits;
+constexpr int numeric_limits<absl::int128>::digits10;
+constexpr int numeric_limits<absl::int128>::max_digits10;
+constexpr int numeric_limits<absl::int128>::radix;
+constexpr int numeric_limits<absl::int128>::min_exponent;
+constexpr int numeric_limits<absl::int128>::min_exponent10;
+constexpr int numeric_limits<absl::int128>::max_exponent;
+constexpr int numeric_limits<absl::int128>::max_exponent10;
+constexpr bool numeric_limits<absl::int128>::traps;
+constexpr bool numeric_limits<absl::int128>::tinyness_before;
+} // namespace std
diff --git a/third_party/abseil/src/absl/numeric/int128.h b/third_party/abseil/src/absl/numeric/int128.h
new file mode 100644
index 0000000..0dd814a
--- /dev/null
+++ b/third_party/abseil/src/absl/numeric/int128.h
@@ -0,0 +1,1092 @@
+//
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: int128.h
+// -----------------------------------------------------------------------------
+//
+// This header file defines 128-bit integer types, `uint128` and `int128`.
+
+#ifndef ABSL_NUMERIC_INT128_H_
+#define ABSL_NUMERIC_INT128_H_
+
+#include <cassert>
+#include <cmath>
+#include <cstdint>
+#include <cstring>
+#include <iosfwd>
+#include <limits>
+#include <utility>
+
+#include "absl/base/config.h"
+#include "absl/base/macros.h"
+#include "absl/base/port.h"
+
+#if defined(_MSC_VER)
+// In very old versions of MSVC and when the /Zc:wchar_t flag is off, wchar_t is
+// a typedef for unsigned short. Otherwise wchar_t is mapped to the __wchar_t
+// builtin type. We need to make sure not to define operator wchar_t()
+// alongside operator unsigned short() in these instances.
+#define ABSL_INTERNAL_WCHAR_T __wchar_t
+#if defined(_M_X64)
+#include <intrin.h>
+#pragma intrinsic(_umul128)
+#endif // defined(_M_X64)
+#else // defined(_MSC_VER)
+#define ABSL_INTERNAL_WCHAR_T wchar_t
+#endif // defined(_MSC_VER)
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+class int128;
+
+// uint128
+//
+// An unsigned 128-bit integer type. The API is meant to mimic an intrinsic type
+// as closely as is practical, including exhibiting undefined behavior in
+// analogous cases (e.g. division by zero). This type is intended to be a
+// drop-in replacement once C++ supports an intrinsic `uint128_t` type; when
+// that occurs, existing well-behaved uses of `uint128` will continue to work
+// using that new type.
+//
+// Note: code written with this type will continue to compile once `uint128_t`
+// is introduced, provided the replacement helper functions
+// `Uint128(Low|High)64()` and `MakeUint128()` are made.
+//
+// A `uint128` supports the following:
+//
+// * Implicit construction from integral types
+// * Explicit conversion to integral types
+//
+// Additionally, if your compiler supports `__int128`, `uint128` is
+// interoperable with that type. (Abseil checks for this compatibility through
+// the `ABSL_HAVE_INTRINSIC_INT128` macro.)
+//
+// However, a `uint128` differs from intrinsic integral types in the following
+// ways:
+//
+// * Errors on implicit conversions that do not preserve value (such as
+// loss of precision when converting to float values).
+// * Requires explicit construction from and conversion to floating point
+// types.
+// * Conversion to integral types requires an explicit static_cast() to
+// mimic use of the `-Wnarrowing` compiler flag.
+// * The alignment requirement of `uint128` may differ from that of an
+// intrinsic 128-bit integer type depending on platform and build
+// configuration.
+//
+// Example:
+//
+// float y = absl::Uint128Max(); // Error. uint128 cannot be implicitly
+// // converted to float.
+//
+// absl::uint128 v;
+// uint64_t i = v; // Error
+// uint64_t i = static_cast<uint64_t>(v); // OK
+//
+class
+#if defined(ABSL_HAVE_INTRINSIC_INT128)
+ alignas(unsigned __int128)
+#endif // ABSL_HAVE_INTRINSIC_INT128
+ uint128 {
+ public:
+ uint128() = default;
+
+ // Constructors from arithmetic types
+ constexpr uint128(int v); // NOLINT(runtime/explicit)
+ constexpr uint128(unsigned int v); // NOLINT(runtime/explicit)
+ constexpr uint128(long v); // NOLINT(runtime/int)
+ constexpr uint128(unsigned long v); // NOLINT(runtime/int)
+ constexpr uint128(long long v); // NOLINT(runtime/int)
+ constexpr uint128(unsigned long long v); // NOLINT(runtime/int)
+#ifdef ABSL_HAVE_INTRINSIC_INT128
+ constexpr uint128(__int128 v); // NOLINT(runtime/explicit)
+ constexpr uint128(unsigned __int128 v); // NOLINT(runtime/explicit)
+#endif // ABSL_HAVE_INTRINSIC_INT128
+ constexpr uint128(int128 v); // NOLINT(runtime/explicit)
+ explicit uint128(float v);
+ explicit uint128(double v);
+ explicit uint128(long double v);
+
+ // Assignment operators from arithmetic types
+ uint128& operator=(int v);
+ uint128& operator=(unsigned int v);
+ uint128& operator=(long v); // NOLINT(runtime/int)
+ uint128& operator=(unsigned long v); // NOLINT(runtime/int)
+ uint128& operator=(long long v); // NOLINT(runtime/int)
+ uint128& operator=(unsigned long long v); // NOLINT(runtime/int)
+#ifdef ABSL_HAVE_INTRINSIC_INT128
+ uint128& operator=(__int128 v);
+ uint128& operator=(unsigned __int128 v);
+#endif // ABSL_HAVE_INTRINSIC_INT128
+ uint128& operator=(int128 v);
+
+ // Conversion operators to other arithmetic types
+ constexpr explicit operator bool() const;
+ constexpr explicit operator char() const;
+ constexpr explicit operator signed char() const;
+ constexpr explicit operator unsigned char() const;
+ constexpr explicit operator char16_t() const;
+ constexpr explicit operator char32_t() const;
+ constexpr explicit operator ABSL_INTERNAL_WCHAR_T() const;
+ constexpr explicit operator short() const; // NOLINT(runtime/int)
+ // NOLINTNEXTLINE(runtime/int)
+ constexpr explicit operator unsigned short() const;
+ constexpr explicit operator int() const;
+ constexpr explicit operator unsigned int() const;
+ constexpr explicit operator long() const; // NOLINT(runtime/int)
+ // NOLINTNEXTLINE(runtime/int)
+ constexpr explicit operator unsigned long() const;
+ // NOLINTNEXTLINE(runtime/int)
+ constexpr explicit operator long long() const;
+ // NOLINTNEXTLINE(runtime/int)
+ constexpr explicit operator unsigned long long() const;
+#ifdef ABSL_HAVE_INTRINSIC_INT128
+ constexpr explicit operator __int128() const;
+ constexpr explicit operator unsigned __int128() const;
+#endif // ABSL_HAVE_INTRINSIC_INT128
+ explicit operator float() const;
+ explicit operator double() const;
+ explicit operator long double() const;
+
+ // Trivial copy constructor, assignment operator and destructor.
+
+ // Arithmetic operators.
+ uint128& operator+=(uint128 other);
+ uint128& operator-=(uint128 other);
+ uint128& operator*=(uint128 other);
+ // Long division/modulo for uint128.
+ uint128& operator/=(uint128 other);
+ uint128& operator%=(uint128 other);
+ uint128 operator++(int);
+ uint128 operator--(int);
+ uint128& operator<<=(int);
+ uint128& operator>>=(int);
+ uint128& operator&=(uint128 other);
+ uint128& operator|=(uint128 other);
+ uint128& operator^=(uint128 other);
+ uint128& operator++();
+ uint128& operator--();
+
+ // Uint128Low64()
+ //
+ // Returns the lower 64-bit value of a `uint128` value.
+ friend constexpr uint64_t Uint128Low64(uint128 v);
+
+ // Uint128High64()
+ //
+ // Returns the higher 64-bit value of a `uint128` value.
+ friend constexpr uint64_t Uint128High64(uint128 v);
+
+ // MakeUInt128()
+ //
+ // Constructs a `uint128` numeric value from two 64-bit unsigned integers.
+ // Note that this factory function is the only way to construct a `uint128`
+ // from integer values greater than 2^64.
+ //
+ // Example:
+ //
+ // absl::uint128 big = absl::MakeUint128(1, 0);
+ friend constexpr uint128 MakeUint128(uint64_t high, uint64_t low);
+
+ // Uint128Max()
+ //
+ // Returns the highest value for a 128-bit unsigned integer.
+ friend constexpr uint128 Uint128Max();
+
+ // Support for absl::Hash.
+ template <typename H>
+ friend H AbslHashValue(H h, uint128 v) {
+ return H::combine(std::move(h), Uint128High64(v), Uint128Low64(v));
+ }
+
+ private:
+ constexpr uint128(uint64_t high, uint64_t low);
+
+ // TODO(strel) Update implementation to use __int128 once all users of
+ // uint128 are fixed to not depend on alignof(uint128) == 8. Also add
+ // alignas(16) to class definition to keep alignment consistent across
+ // platforms.
+#if defined(ABSL_IS_LITTLE_ENDIAN)
+ uint64_t lo_;
+ uint64_t hi_;
+#elif defined(ABSL_IS_BIG_ENDIAN)
+ uint64_t hi_;
+ uint64_t lo_;
+#else // byte order
+#error "Unsupported byte order: must be little-endian or big-endian."
+#endif // byte order
+};
+
+// Prefer to use the constexpr `Uint128Max()`.
+//
+// TODO(absl-team) deprecate kuint128max once migration tool is released.
+ABSL_DLL extern const uint128 kuint128max;
+
+// allow uint128 to be logged
+std::ostream& operator<<(std::ostream& os, uint128 v);
+
+// TODO(strel) add operator>>(std::istream&, uint128)
+
+constexpr uint128 Uint128Max() {
+ return uint128((std::numeric_limits<uint64_t>::max)(),
+ (std::numeric_limits<uint64_t>::max)());
+}
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+// Specialized numeric_limits for uint128.
+namespace std {
+template <>
+class numeric_limits<absl::uint128> {
+ public:
+ static constexpr bool is_specialized = true;
+ static constexpr bool is_signed = false;
+ static constexpr bool is_integer = true;
+ static constexpr bool is_exact = true;
+ static constexpr bool has_infinity = false;
+ static constexpr bool has_quiet_NaN = false;
+ static constexpr bool has_signaling_NaN = false;
+ static constexpr float_denorm_style has_denorm = denorm_absent;
+ static constexpr bool has_denorm_loss = false;
+ static constexpr float_round_style round_style = round_toward_zero;
+ static constexpr bool is_iec559 = false;
+ static constexpr bool is_bounded = true;
+ static constexpr bool is_modulo = true;
+ static constexpr int digits = 128;
+ static constexpr int digits10 = 38;
+ static constexpr int max_digits10 = 0;
+ static constexpr int radix = 2;
+ static constexpr int min_exponent = 0;
+ static constexpr int min_exponent10 = 0;
+ static constexpr int max_exponent = 0;
+ static constexpr int max_exponent10 = 0;
+#ifdef ABSL_HAVE_INTRINSIC_INT128
+ static constexpr bool traps = numeric_limits<unsigned __int128>::traps;
+#else // ABSL_HAVE_INTRINSIC_INT128
+ static constexpr bool traps = numeric_limits<uint64_t>::traps;
+#endif // ABSL_HAVE_INTRINSIC_INT128
+ static constexpr bool tinyness_before = false;
+
+ static constexpr absl::uint128 (min)() { return 0; }
+ static constexpr absl::uint128 lowest() { return 0; }
+ static constexpr absl::uint128 (max)() { return absl::Uint128Max(); }
+ static constexpr absl::uint128 epsilon() { return 0; }
+ static constexpr absl::uint128 round_error() { return 0; }
+ static constexpr absl::uint128 infinity() { return 0; }
+ static constexpr absl::uint128 quiet_NaN() { return 0; }
+ static constexpr absl::uint128 signaling_NaN() { return 0; }
+ static constexpr absl::uint128 denorm_min() { return 0; }
+};
+} // namespace std
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+// int128
+//
+// A signed 128-bit integer type. The API is meant to mimic an intrinsic
+// integral type as closely as is practical, including exhibiting undefined
+// behavior in analogous cases (e.g. division by zero).
+//
+// An `int128` supports the following:
+//
+// * Implicit construction from integral types
+// * Explicit conversion to integral types
+//
+// However, an `int128` differs from intrinsic integral types in the following
+// ways:
+//
+// * It is not implicitly convertible to other integral types.
+// * Requires explicit construction from and conversion to floating point
+// types.
+
+// Additionally, if your compiler supports `__int128`, `int128` is
+// interoperable with that type. (Abseil checks for this compatibility through
+// the `ABSL_HAVE_INTRINSIC_INT128` macro.)
+//
+// The design goal for `int128` is that it will be compatible with a future
+// `int128_t`, if that type becomes a part of the standard.
+//
+// Example:
+//
+// float y = absl::int128(17); // Error. int128 cannot be implicitly
+// // converted to float.
+//
+// absl::int128 v;
+// int64_t i = v; // Error
+// int64_t i = static_cast<int64_t>(v); // OK
+//
+class int128 {
+ public:
+ int128() = default;
+
+ // Constructors from arithmetic types
+ constexpr int128(int v); // NOLINT(runtime/explicit)
+ constexpr int128(unsigned int v); // NOLINT(runtime/explicit)
+ constexpr int128(long v); // NOLINT(runtime/int)
+ constexpr int128(unsigned long v); // NOLINT(runtime/int)
+ constexpr int128(long long v); // NOLINT(runtime/int)
+ constexpr int128(unsigned long long v); // NOLINT(runtime/int)
+#ifdef ABSL_HAVE_INTRINSIC_INT128
+ constexpr int128(__int128 v); // NOLINT(runtime/explicit)
+ constexpr explicit int128(unsigned __int128 v);
+#endif // ABSL_HAVE_INTRINSIC_INT128
+ constexpr explicit int128(uint128 v);
+ explicit int128(float v);
+ explicit int128(double v);
+ explicit int128(long double v);
+
+ // Assignment operators from arithmetic types
+ int128& operator=(int v);
+ int128& operator=(unsigned int v);
+ int128& operator=(long v); // NOLINT(runtime/int)
+ int128& operator=(unsigned long v); // NOLINT(runtime/int)
+ int128& operator=(long long v); // NOLINT(runtime/int)
+ int128& operator=(unsigned long long v); // NOLINT(runtime/int)
+#ifdef ABSL_HAVE_INTRINSIC_INT128
+ int128& operator=(__int128 v);
+#endif // ABSL_HAVE_INTRINSIC_INT128
+
+ // Conversion operators to other arithmetic types
+ constexpr explicit operator bool() const;
+ constexpr explicit operator char() const;
+ constexpr explicit operator signed char() const;
+ constexpr explicit operator unsigned char() const;
+ constexpr explicit operator char16_t() const;
+ constexpr explicit operator char32_t() const;
+ constexpr explicit operator ABSL_INTERNAL_WCHAR_T() const;
+ constexpr explicit operator short() const; // NOLINT(runtime/int)
+ // NOLINTNEXTLINE(runtime/int)
+ constexpr explicit operator unsigned short() const;
+ constexpr explicit operator int() const;
+ constexpr explicit operator unsigned int() const;
+ constexpr explicit operator long() const; // NOLINT(runtime/int)
+ // NOLINTNEXTLINE(runtime/int)
+ constexpr explicit operator unsigned long() const;
+ // NOLINTNEXTLINE(runtime/int)
+ constexpr explicit operator long long() const;
+ // NOLINTNEXTLINE(runtime/int)
+ constexpr explicit operator unsigned long long() const;
+#ifdef ABSL_HAVE_INTRINSIC_INT128
+ constexpr explicit operator __int128() const;
+ constexpr explicit operator unsigned __int128() const;
+#endif // ABSL_HAVE_INTRINSIC_INT128
+ explicit operator float() const;
+ explicit operator double() const;
+ explicit operator long double() const;
+
+ // Trivial copy constructor, assignment operator and destructor.
+
+ // Arithmetic operators
+ int128& operator+=(int128 other);
+ int128& operator-=(int128 other);
+ int128& operator*=(int128 other);
+ int128& operator/=(int128 other);
+ int128& operator%=(int128 other);
+ int128 operator++(int); // postfix increment: i++
+ int128 operator--(int); // postfix decrement: i--
+ int128& operator++(); // prefix increment: ++i
+ int128& operator--(); // prefix decrement: --i
+ int128& operator&=(int128 other);
+ int128& operator|=(int128 other);
+ int128& operator^=(int128 other);
+ int128& operator<<=(int amount);
+ int128& operator>>=(int amount);
+
+ // Int128Low64()
+ //
+ // Returns the lower 64-bit value of a `int128` value.
+ friend constexpr uint64_t Int128Low64(int128 v);
+
+ // Int128High64()
+ //
+ // Returns the higher 64-bit value of a `int128` value.
+ friend constexpr int64_t Int128High64(int128 v);
+
+ // MakeInt128()
+ //
+ // Constructs a `int128` numeric value from two 64-bit integers. Note that
+ // signedness is conveyed in the upper `high` value.
+ //
+ // (absl::int128(1) << 64) * high + low
+ //
+ // Note that this factory function is the only way to construct a `int128`
+ // from integer values greater than 2^64 or less than -2^64.
+ //
+ // Example:
+ //
+ // absl::int128 big = absl::MakeInt128(1, 0);
+ // absl::int128 big_n = absl::MakeInt128(-1, 0);
+ friend constexpr int128 MakeInt128(int64_t high, uint64_t low);
+
+ // Int128Max()
+ //
+ // Returns the maximum value for a 128-bit signed integer.
+ friend constexpr int128 Int128Max();
+
+ // Int128Min()
+ //
+ // Returns the minimum value for a 128-bit signed integer.
+ friend constexpr int128 Int128Min();
+
+ // Support for absl::Hash.
+ template <typename H>
+ friend H AbslHashValue(H h, int128 v) {
+ return H::combine(std::move(h), Int128High64(v), Int128Low64(v));
+ }
+
+ private:
+ constexpr int128(int64_t high, uint64_t low);
+
+#if defined(ABSL_HAVE_INTRINSIC_INT128)
+ __int128 v_;
+#else // ABSL_HAVE_INTRINSIC_INT128
+#if defined(ABSL_IS_LITTLE_ENDIAN)
+ uint64_t lo_;
+ int64_t hi_;
+#elif defined(ABSL_IS_BIG_ENDIAN)
+ int64_t hi_;
+ uint64_t lo_;
+#else // byte order
+#error "Unsupported byte order: must be little-endian or big-endian."
+#endif // byte order
+#endif // ABSL_HAVE_INTRINSIC_INT128
+};
+
+std::ostream& operator<<(std::ostream& os, int128 v);
+
+// TODO(absl-team) add operator>>(std::istream&, int128)
+
+constexpr int128 Int128Max() {
+ return int128((std::numeric_limits<int64_t>::max)(),
+ (std::numeric_limits<uint64_t>::max)());
+}
+
+constexpr int128 Int128Min() {
+ return int128((std::numeric_limits<int64_t>::min)(), 0);
+}
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+// Specialized numeric_limits for int128.
+namespace std {
+template <>
+class numeric_limits<absl::int128> {
+ public:
+ static constexpr bool is_specialized = true;
+ static constexpr bool is_signed = true;
+ static constexpr bool is_integer = true;
+ static constexpr bool is_exact = true;
+ static constexpr bool has_infinity = false;
+ static constexpr bool has_quiet_NaN = false;
+ static constexpr bool has_signaling_NaN = false;
+ static constexpr float_denorm_style has_denorm = denorm_absent;
+ static constexpr bool has_denorm_loss = false;
+ static constexpr float_round_style round_style = round_toward_zero;
+ static constexpr bool is_iec559 = false;
+ static constexpr bool is_bounded = true;
+ static constexpr bool is_modulo = false;
+ static constexpr int digits = 127;
+ static constexpr int digits10 = 38;
+ static constexpr int max_digits10 = 0;
+ static constexpr int radix = 2;
+ static constexpr int min_exponent = 0;
+ static constexpr int min_exponent10 = 0;
+ static constexpr int max_exponent = 0;
+ static constexpr int max_exponent10 = 0;
+#ifdef ABSL_HAVE_INTRINSIC_INT128
+ static constexpr bool traps = numeric_limits<__int128>::traps;
+#else // ABSL_HAVE_INTRINSIC_INT128
+ static constexpr bool traps = numeric_limits<uint64_t>::traps;
+#endif // ABSL_HAVE_INTRINSIC_INT128
+ static constexpr bool tinyness_before = false;
+
+ static constexpr absl::int128 (min)() { return absl::Int128Min(); }
+ static constexpr absl::int128 lowest() { return absl::Int128Min(); }
+ static constexpr absl::int128 (max)() { return absl::Int128Max(); }
+ static constexpr absl::int128 epsilon() { return 0; }
+ static constexpr absl::int128 round_error() { return 0; }
+ static constexpr absl::int128 infinity() { return 0; }
+ static constexpr absl::int128 quiet_NaN() { return 0; }
+ static constexpr absl::int128 signaling_NaN() { return 0; }
+ static constexpr absl::int128 denorm_min() { return 0; }
+};
+} // namespace std
+
+// --------------------------------------------------------------------------
+// Implementation details follow
+// --------------------------------------------------------------------------
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+constexpr uint128 MakeUint128(uint64_t high, uint64_t low) {
+ return uint128(high, low);
+}
+
+// Assignment from integer types.
+
+inline uint128& uint128::operator=(int v) { return *this = uint128(v); }
+
+inline uint128& uint128::operator=(unsigned int v) {
+ return *this = uint128(v);
+}
+
+inline uint128& uint128::operator=(long v) { // NOLINT(runtime/int)
+ return *this = uint128(v);
+}
+
+// NOLINTNEXTLINE(runtime/int)
+inline uint128& uint128::operator=(unsigned long v) {
+ return *this = uint128(v);
+}
+
+// NOLINTNEXTLINE(runtime/int)
+inline uint128& uint128::operator=(long long v) {
+ return *this = uint128(v);
+}
+
+// NOLINTNEXTLINE(runtime/int)
+inline uint128& uint128::operator=(unsigned long long v) {
+ return *this = uint128(v);
+}
+
+#ifdef ABSL_HAVE_INTRINSIC_INT128
+inline uint128& uint128::operator=(__int128 v) {
+ return *this = uint128(v);
+}
+
+inline uint128& uint128::operator=(unsigned __int128 v) {
+ return *this = uint128(v);
+}
+#endif // ABSL_HAVE_INTRINSIC_INT128
+
+inline uint128& uint128::operator=(int128 v) {
+ return *this = uint128(v);
+}
+
+// Arithmetic operators.
+
+uint128 operator<<(uint128 lhs, int amount);
+uint128 operator>>(uint128 lhs, int amount);
+uint128 operator+(uint128 lhs, uint128 rhs);
+uint128 operator-(uint128 lhs, uint128 rhs);
+uint128 operator*(uint128 lhs, uint128 rhs);
+uint128 operator/(uint128 lhs, uint128 rhs);
+uint128 operator%(uint128 lhs, uint128 rhs);
+
+inline uint128& uint128::operator<<=(int amount) {
+ *this = *this << amount;
+ return *this;
+}
+
+inline uint128& uint128::operator>>=(int amount) {
+ *this = *this >> amount;
+ return *this;
+}
+
+inline uint128& uint128::operator+=(uint128 other) {
+ *this = *this + other;
+ return *this;
+}
+
+inline uint128& uint128::operator-=(uint128 other) {
+ *this = *this - other;
+ return *this;
+}
+
+inline uint128& uint128::operator*=(uint128 other) {
+ *this = *this * other;
+ return *this;
+}
+
+inline uint128& uint128::operator/=(uint128 other) {
+ *this = *this / other;
+ return *this;
+}
+
+inline uint128& uint128::operator%=(uint128 other) {
+ *this = *this % other;
+ return *this;
+}
+
+constexpr uint64_t Uint128Low64(uint128 v) { return v.lo_; }
+
+constexpr uint64_t Uint128High64(uint128 v) { return v.hi_; }
+
+// Constructors from integer types.
+
+#if defined(ABSL_IS_LITTLE_ENDIAN)
+
+constexpr uint128::uint128(uint64_t high, uint64_t low)
+ : lo_{low}, hi_{high} {}
+
+constexpr uint128::uint128(int v)
+ : lo_{static_cast<uint64_t>(v)},
+ hi_{v < 0 ? (std::numeric_limits<uint64_t>::max)() : 0} {}
+constexpr uint128::uint128(long v) // NOLINT(runtime/int)
+ : lo_{static_cast<uint64_t>(v)},
+ hi_{v < 0 ? (std::numeric_limits<uint64_t>::max)() : 0} {}
+constexpr uint128::uint128(long long v) // NOLINT(runtime/int)
+ : lo_{static_cast<uint64_t>(v)},
+ hi_{v < 0 ? (std::numeric_limits<uint64_t>::max)() : 0} {}
+
+constexpr uint128::uint128(unsigned int v) : lo_{v}, hi_{0} {}
+// NOLINTNEXTLINE(runtime/int)
+constexpr uint128::uint128(unsigned long v) : lo_{v}, hi_{0} {}
+// NOLINTNEXTLINE(runtime/int)
+constexpr uint128::uint128(unsigned long long v) : lo_{v}, hi_{0} {}
+
+#ifdef ABSL_HAVE_INTRINSIC_INT128
+constexpr uint128::uint128(__int128 v)
+ : lo_{static_cast<uint64_t>(v & ~uint64_t{0})},
+ hi_{static_cast<uint64_t>(static_cast<unsigned __int128>(v) >> 64)} {}
+constexpr uint128::uint128(unsigned __int128 v)
+ : lo_{static_cast<uint64_t>(v & ~uint64_t{0})},
+ hi_{static_cast<uint64_t>(v >> 64)} {}
+#endif // ABSL_HAVE_INTRINSIC_INT128
+
+constexpr uint128::uint128(int128 v)
+ : lo_{Int128Low64(v)}, hi_{static_cast<uint64_t>(Int128High64(v))} {}
+
+#elif defined(ABSL_IS_BIG_ENDIAN)
+
+constexpr uint128::uint128(uint64_t high, uint64_t low)
+ : hi_{high}, lo_{low} {}
+
+constexpr uint128::uint128(int v)
+ : hi_{v < 0 ? (std::numeric_limits<uint64_t>::max)() : 0},
+ lo_{static_cast<uint64_t>(v)} {}
+constexpr uint128::uint128(long v) // NOLINT(runtime/int)
+ : hi_{v < 0 ? (std::numeric_limits<uint64_t>::max)() : 0},
+ lo_{static_cast<uint64_t>(v)} {}
+constexpr uint128::uint128(long long v) // NOLINT(runtime/int)
+ : hi_{v < 0 ? (std::numeric_limits<uint64_t>::max)() : 0},
+ lo_{static_cast<uint64_t>(v)} {}
+
+constexpr uint128::uint128(unsigned int v) : hi_{0}, lo_{v} {}
+// NOLINTNEXTLINE(runtime/int)
+constexpr uint128::uint128(unsigned long v) : hi_{0}, lo_{v} {}
+// NOLINTNEXTLINE(runtime/int)
+constexpr uint128::uint128(unsigned long long v) : hi_{0}, lo_{v} {}
+
+#ifdef ABSL_HAVE_INTRINSIC_INT128
+constexpr uint128::uint128(__int128 v)
+ : hi_{static_cast<uint64_t>(static_cast<unsigned __int128>(v) >> 64)},
+ lo_{static_cast<uint64_t>(v & ~uint64_t{0})} {}
+constexpr uint128::uint128(unsigned __int128 v)
+ : hi_{static_cast<uint64_t>(v >> 64)},
+ lo_{static_cast<uint64_t>(v & ~uint64_t{0})} {}
+#endif // ABSL_HAVE_INTRINSIC_INT128
+
+constexpr uint128::uint128(int128 v)
+ : hi_{static_cast<uint64_t>(Int128High64(v))}, lo_{Int128Low64(v)} {}
+
+#else // byte order
+#error "Unsupported byte order: must be little-endian or big-endian."
+#endif // byte order
+
+// Conversion operators to integer types.
+
+constexpr uint128::operator bool() const { return lo_ || hi_; }
+
+constexpr uint128::operator char() const { return static_cast<char>(lo_); }
+
+constexpr uint128::operator signed char() const {
+ return static_cast<signed char>(lo_);
+}
+
+constexpr uint128::operator unsigned char() const {
+ return static_cast<unsigned char>(lo_);
+}
+
+constexpr uint128::operator char16_t() const {
+ return static_cast<char16_t>(lo_);
+}
+
+constexpr uint128::operator char32_t() const {
+ return static_cast<char32_t>(lo_);
+}
+
+constexpr uint128::operator ABSL_INTERNAL_WCHAR_T() const {
+ return static_cast<ABSL_INTERNAL_WCHAR_T>(lo_);
+}
+
+// NOLINTNEXTLINE(runtime/int)
+constexpr uint128::operator short() const { return static_cast<short>(lo_); }
+
+constexpr uint128::operator unsigned short() const { // NOLINT(runtime/int)
+ return static_cast<unsigned short>(lo_); // NOLINT(runtime/int)
+}
+
+constexpr uint128::operator int() const { return static_cast<int>(lo_); }
+
+constexpr uint128::operator unsigned int() const {
+ return static_cast<unsigned int>(lo_);
+}
+
+// NOLINTNEXTLINE(runtime/int)
+constexpr uint128::operator long() const { return static_cast<long>(lo_); }
+
+constexpr uint128::operator unsigned long() const { // NOLINT(runtime/int)
+ return static_cast<unsigned long>(lo_); // NOLINT(runtime/int)
+}
+
+constexpr uint128::operator long long() const { // NOLINT(runtime/int)
+ return static_cast<long long>(lo_); // NOLINT(runtime/int)
+}
+
+constexpr uint128::operator unsigned long long() const { // NOLINT(runtime/int)
+ return static_cast<unsigned long long>(lo_); // NOLINT(runtime/int)
+}
+
+#ifdef ABSL_HAVE_INTRINSIC_INT128
+constexpr uint128::operator __int128() const {
+ return (static_cast<__int128>(hi_) << 64) + lo_;
+}
+
+constexpr uint128::operator unsigned __int128() const {
+ return (static_cast<unsigned __int128>(hi_) << 64) + lo_;
+}
+#endif // ABSL_HAVE_INTRINSIC_INT128
+
+// Conversion operators to floating point types.
+
+inline uint128::operator float() const {
+ return static_cast<float>(lo_) + std::ldexp(static_cast<float>(hi_), 64);
+}
+
+inline uint128::operator double() const {
+ return static_cast<double>(lo_) + std::ldexp(static_cast<double>(hi_), 64);
+}
+
+inline uint128::operator long double() const {
+ return static_cast<long double>(lo_) +
+ std::ldexp(static_cast<long double>(hi_), 64);
+}
+
+// Comparison operators.
+
+inline bool operator==(uint128 lhs, uint128 rhs) {
+ return (Uint128Low64(lhs) == Uint128Low64(rhs) &&
+ Uint128High64(lhs) == Uint128High64(rhs));
+}
+
+inline bool operator!=(uint128 lhs, uint128 rhs) {
+ return !(lhs == rhs);
+}
+
+inline bool operator<(uint128 lhs, uint128 rhs) {
+#ifdef ABSL_HAVE_INTRINSIC_INT128
+ return static_cast<unsigned __int128>(lhs) <
+ static_cast<unsigned __int128>(rhs);
+#else
+ return (Uint128High64(lhs) == Uint128High64(rhs))
+ ? (Uint128Low64(lhs) < Uint128Low64(rhs))
+ : (Uint128High64(lhs) < Uint128High64(rhs));
+#endif
+}
+
+inline bool operator>(uint128 lhs, uint128 rhs) { return rhs < lhs; }
+
+inline bool operator<=(uint128 lhs, uint128 rhs) { return !(rhs < lhs); }
+
+inline bool operator>=(uint128 lhs, uint128 rhs) { return !(lhs < rhs); }
+
+// Unary operators.
+
+inline uint128 operator-(uint128 val) {
+ uint64_t hi = ~Uint128High64(val);
+ uint64_t lo = ~Uint128Low64(val) + 1;
+ if (lo == 0) ++hi; // carry
+ return MakeUint128(hi, lo);
+}
+
+inline bool operator!(uint128 val) {
+ return !Uint128High64(val) && !Uint128Low64(val);
+}
+
+// Logical operators.
+
+inline uint128 operator~(uint128 val) {
+ return MakeUint128(~Uint128High64(val), ~Uint128Low64(val));
+}
+
+inline uint128 operator|(uint128 lhs, uint128 rhs) {
+ return MakeUint128(Uint128High64(lhs) | Uint128High64(rhs),
+ Uint128Low64(lhs) | Uint128Low64(rhs));
+}
+
+inline uint128 operator&(uint128 lhs, uint128 rhs) {
+ return MakeUint128(Uint128High64(lhs) & Uint128High64(rhs),
+ Uint128Low64(lhs) & Uint128Low64(rhs));
+}
+
+inline uint128 operator^(uint128 lhs, uint128 rhs) {
+ return MakeUint128(Uint128High64(lhs) ^ Uint128High64(rhs),
+ Uint128Low64(lhs) ^ Uint128Low64(rhs));
+}
+
+inline uint128& uint128::operator|=(uint128 other) {
+ hi_ |= other.hi_;
+ lo_ |= other.lo_;
+ return *this;
+}
+
+inline uint128& uint128::operator&=(uint128 other) {
+ hi_ &= other.hi_;
+ lo_ &= other.lo_;
+ return *this;
+}
+
+inline uint128& uint128::operator^=(uint128 other) {
+ hi_ ^= other.hi_;
+ lo_ ^= other.lo_;
+ return *this;
+}
+
+// Arithmetic operators.
+
+inline uint128 operator<<(uint128 lhs, int amount) {
+#ifdef ABSL_HAVE_INTRINSIC_INT128
+ return static_cast<unsigned __int128>(lhs) << amount;
+#else
+ // uint64_t shifts of >= 64 are undefined, so we will need some
+ // special-casing.
+ if (amount < 64) {
+ if (amount != 0) {
+ return MakeUint128(
+ (Uint128High64(lhs) << amount) | (Uint128Low64(lhs) >> (64 - amount)),
+ Uint128Low64(lhs) << amount);
+ }
+ return lhs;
+ }
+ return MakeUint128(Uint128Low64(lhs) << (amount - 64), 0);
+#endif
+}
+
+inline uint128 operator>>(uint128 lhs, int amount) {
+#ifdef ABSL_HAVE_INTRINSIC_INT128
+ return static_cast<unsigned __int128>(lhs) >> amount;
+#else
+ // uint64_t shifts of >= 64 are undefined, so we will need some
+ // special-casing.
+ if (amount < 64) {
+ if (amount != 0) {
+ return MakeUint128(Uint128High64(lhs) >> amount,
+ (Uint128Low64(lhs) >> amount) |
+ (Uint128High64(lhs) << (64 - amount)));
+ }
+ return lhs;
+ }
+ return MakeUint128(0, Uint128High64(lhs) >> (amount - 64));
+#endif
+}
+
+inline uint128 operator+(uint128 lhs, uint128 rhs) {
+ uint128 result = MakeUint128(Uint128High64(lhs) + Uint128High64(rhs),
+ Uint128Low64(lhs) + Uint128Low64(rhs));
+ if (Uint128Low64(result) < Uint128Low64(lhs)) { // check for carry
+ return MakeUint128(Uint128High64(result) + 1, Uint128Low64(result));
+ }
+ return result;
+}
+
+inline uint128 operator-(uint128 lhs, uint128 rhs) {
+ uint128 result = MakeUint128(Uint128High64(lhs) - Uint128High64(rhs),
+ Uint128Low64(lhs) - Uint128Low64(rhs));
+ if (Uint128Low64(lhs) < Uint128Low64(rhs)) { // check for carry
+ return MakeUint128(Uint128High64(result) - 1, Uint128Low64(result));
+ }
+ return result;
+}
+
+inline uint128 operator*(uint128 lhs, uint128 rhs) {
+#if defined(ABSL_HAVE_INTRINSIC_INT128)
+ // TODO(strel) Remove once alignment issues are resolved and unsigned __int128
+ // can be used for uint128 storage.
+ return static_cast<unsigned __int128>(lhs) *
+ static_cast<unsigned __int128>(rhs);
+#elif defined(_MSC_VER) && defined(_M_X64)
+ uint64_t carry;
+ uint64_t low = _umul128(Uint128Low64(lhs), Uint128Low64(rhs), &carry);
+ return MakeUint128(Uint128Low64(lhs) * Uint128High64(rhs) +
+ Uint128High64(lhs) * Uint128Low64(rhs) + carry,
+ low);
+#else // ABSL_HAVE_INTRINSIC128
+ uint64_t a32 = Uint128Low64(lhs) >> 32;
+ uint64_t a00 = Uint128Low64(lhs) & 0xffffffff;
+ uint64_t b32 = Uint128Low64(rhs) >> 32;
+ uint64_t b00 = Uint128Low64(rhs) & 0xffffffff;
+ uint128 result =
+ MakeUint128(Uint128High64(lhs) * Uint128Low64(rhs) +
+ Uint128Low64(lhs) * Uint128High64(rhs) + a32 * b32,
+ a00 * b00);
+ result += uint128(a32 * b00) << 32;
+ result += uint128(a00 * b32) << 32;
+ return result;
+#endif // ABSL_HAVE_INTRINSIC128
+}
+
+// Increment/decrement operators.
+
+inline uint128 uint128::operator++(int) {
+ uint128 tmp(*this);
+ *this += 1;
+ return tmp;
+}
+
+inline uint128 uint128::operator--(int) {
+ uint128 tmp(*this);
+ *this -= 1;
+ return tmp;
+}
+
+inline uint128& uint128::operator++() {
+ *this += 1;
+ return *this;
+}
+
+inline uint128& uint128::operator--() {
+ *this -= 1;
+ return *this;
+}
+
+constexpr int128 MakeInt128(int64_t high, uint64_t low) {
+ return int128(high, low);
+}
+
+// Assignment from integer types.
+inline int128& int128::operator=(int v) {
+ return *this = int128(v);
+}
+
+inline int128& int128::operator=(unsigned int v) {
+ return *this = int128(v);
+}
+
+inline int128& int128::operator=(long v) { // NOLINT(runtime/int)
+ return *this = int128(v);
+}
+
+// NOLINTNEXTLINE(runtime/int)
+inline int128& int128::operator=(unsigned long v) {
+ return *this = int128(v);
+}
+
+// NOLINTNEXTLINE(runtime/int)
+inline int128& int128::operator=(long long v) {
+ return *this = int128(v);
+}
+
+// NOLINTNEXTLINE(runtime/int)
+inline int128& int128::operator=(unsigned long long v) {
+ return *this = int128(v);
+}
+
+// Arithmetic operators.
+
+int128 operator+(int128 lhs, int128 rhs);
+int128 operator-(int128 lhs, int128 rhs);
+int128 operator*(int128 lhs, int128 rhs);
+int128 operator/(int128 lhs, int128 rhs);
+int128 operator%(int128 lhs, int128 rhs);
+int128 operator|(int128 lhs, int128 rhs);
+int128 operator&(int128 lhs, int128 rhs);
+int128 operator^(int128 lhs, int128 rhs);
+int128 operator<<(int128 lhs, int amount);
+int128 operator>>(int128 lhs, int amount);
+
+inline int128& int128::operator+=(int128 other) {
+ *this = *this + other;
+ return *this;
+}
+
+inline int128& int128::operator-=(int128 other) {
+ *this = *this - other;
+ return *this;
+}
+
+inline int128& int128::operator*=(int128 other) {
+ *this = *this * other;
+ return *this;
+}
+
+inline int128& int128::operator/=(int128 other) {
+ *this = *this / other;
+ return *this;
+}
+
+inline int128& int128::operator%=(int128 other) {
+ *this = *this % other;
+ return *this;
+}
+
+inline int128& int128::operator|=(int128 other) {
+ *this = *this | other;
+ return *this;
+}
+
+inline int128& int128::operator&=(int128 other) {
+ *this = *this & other;
+ return *this;
+}
+
+inline int128& int128::operator^=(int128 other) {
+ *this = *this ^ other;
+ return *this;
+}
+
+inline int128& int128::operator<<=(int amount) {
+ *this = *this << amount;
+ return *this;
+}
+
+inline int128& int128::operator>>=(int amount) {
+ *this = *this >> amount;
+ return *this;
+}
+
+namespace int128_internal {
+
+// Casts from unsigned to signed while preserving the underlying binary
+// representation.
+constexpr int64_t BitCastToSigned(uint64_t v) {
+ // Casting an unsigned integer to a signed integer of the same
+ // width is implementation defined behavior if the source value would not fit
+ // in the destination type. We step around it with a roundtrip bitwise not
+ // operation to make sure this function remains constexpr. Clang, GCC, and
+ // MSVC optimize this to a no-op on x86-64.
+ return v & (uint64_t{1} << 63) ? ~static_cast<int64_t>(~v)
+ : static_cast<int64_t>(v);
+}
+
+} // namespace int128_internal
+
+#if defined(ABSL_HAVE_INTRINSIC_INT128)
+#include "absl/numeric/int128_have_intrinsic.inc" // IWYU pragma: export
+#else // ABSL_HAVE_INTRINSIC_INT128
+#include "absl/numeric/int128_no_intrinsic.inc" // IWYU pragma: export
+#endif // ABSL_HAVE_INTRINSIC_INT128
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#undef ABSL_INTERNAL_WCHAR_T
+
+#endif // ABSL_NUMERIC_INT128_H_
diff --git a/third_party/abseil/src/absl/numeric/int128_benchmark.cc b/third_party/abseil/src/absl/numeric/int128_benchmark.cc
new file mode 100644
index 0000000..eab1515
--- /dev/null
+++ b/third_party/abseil/src/absl/numeric/int128_benchmark.cc
@@ -0,0 +1,282 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <algorithm>
+#include <cstdint>
+#include <limits>
+#include <random>
+#include <vector>
+
+#include "benchmark/benchmark.h"
+#include "absl/base/config.h"
+#include "absl/numeric/int128.h"
+
+namespace {
+
+constexpr size_t kSampleSize = 1000000;
+
+std::mt19937 MakeRandomEngine() {
+ std::random_device r;
+ std::seed_seq seed({r(), r(), r(), r(), r(), r(), r(), r()});
+ return std::mt19937(seed);
+}
+
+template <typename T,
+ typename H = typename std::conditional<
+ std::numeric_limits<T>::is_signed, int64_t, uint64_t>::type>
+std::vector<std::pair<T, T>> GetRandomClass128SampleUniformDivisor() {
+ std::vector<std::pair<T, T>> values;
+ std::mt19937 random = MakeRandomEngine();
+ std::uniform_int_distribution<H> uniform_h;
+ values.reserve(kSampleSize);
+ for (size_t i = 0; i < kSampleSize; ++i) {
+ T a{absl::MakeUint128(uniform_h(random), uniform_h(random))};
+ T b{absl::MakeUint128(uniform_h(random), uniform_h(random))};
+ values.emplace_back(std::max(a, b), std::max(T(2), std::min(a, b)));
+ }
+ return values;
+}
+
+template <typename T>
+void BM_DivideClass128UniformDivisor(benchmark::State& state) {
+ auto values = GetRandomClass128SampleUniformDivisor<T>();
+ while (state.KeepRunningBatch(values.size())) {
+ for (const auto& pair : values) {
+ benchmark::DoNotOptimize(pair.first / pair.second);
+ }
+ }
+}
+BENCHMARK_TEMPLATE(BM_DivideClass128UniformDivisor, absl::uint128);
+BENCHMARK_TEMPLATE(BM_DivideClass128UniformDivisor, absl::int128);
+
+template <typename T>
+void BM_RemainderClass128UniformDivisor(benchmark::State& state) {
+ auto values = GetRandomClass128SampleUniformDivisor<T>();
+ while (state.KeepRunningBatch(values.size())) {
+ for (const auto& pair : values) {
+ benchmark::DoNotOptimize(pair.first % pair.second);
+ }
+ }
+}
+BENCHMARK_TEMPLATE(BM_RemainderClass128UniformDivisor, absl::uint128);
+BENCHMARK_TEMPLATE(BM_RemainderClass128UniformDivisor, absl::int128);
+
+template <typename T,
+ typename H = typename std::conditional<
+ std::numeric_limits<T>::is_signed, int64_t, uint64_t>::type>
+std::vector<std::pair<T, H>> GetRandomClass128SampleSmallDivisor() {
+ std::vector<std::pair<T, H>> values;
+ std::mt19937 random = MakeRandomEngine();
+ std::uniform_int_distribution<H> uniform_h;
+ values.reserve(kSampleSize);
+ for (size_t i = 0; i < kSampleSize; ++i) {
+ T a{absl::MakeUint128(uniform_h(random), uniform_h(random))};
+ H b{std::max(H{2}, uniform_h(random))};
+ values.emplace_back(std::max(a, T(b)), b);
+ }
+ return values;
+}
+
+template <typename T>
+void BM_DivideClass128SmallDivisor(benchmark::State& state) {
+ auto values = GetRandomClass128SampleSmallDivisor<T>();
+ while (state.KeepRunningBatch(values.size())) {
+ for (const auto& pair : values) {
+ benchmark::DoNotOptimize(pair.first / pair.second);
+ }
+ }
+}
+BENCHMARK_TEMPLATE(BM_DivideClass128SmallDivisor, absl::uint128);
+BENCHMARK_TEMPLATE(BM_DivideClass128SmallDivisor, absl::int128);
+
+template <typename T>
+void BM_RemainderClass128SmallDivisor(benchmark::State& state) {
+ auto values = GetRandomClass128SampleSmallDivisor<T>();
+ while (state.KeepRunningBatch(values.size())) {
+ for (const auto& pair : values) {
+ benchmark::DoNotOptimize(pair.first % pair.second);
+ }
+ }
+}
+BENCHMARK_TEMPLATE(BM_RemainderClass128SmallDivisor, absl::uint128);
+BENCHMARK_TEMPLATE(BM_RemainderClass128SmallDivisor, absl::int128);
+
+std::vector<std::pair<absl::uint128, absl::uint128>> GetRandomClass128Sample() {
+ std::vector<std::pair<absl::uint128, absl::uint128>> values;
+ std::mt19937 random = MakeRandomEngine();
+ std::uniform_int_distribution<uint64_t> uniform_uint64;
+ values.reserve(kSampleSize);
+ for (size_t i = 0; i < kSampleSize; ++i) {
+ values.emplace_back(
+ absl::MakeUint128(uniform_uint64(random), uniform_uint64(random)),
+ absl::MakeUint128(uniform_uint64(random), uniform_uint64(random)));
+ }
+ return values;
+}
+
+void BM_MultiplyClass128(benchmark::State& state) {
+ auto values = GetRandomClass128Sample();
+ while (state.KeepRunningBatch(values.size())) {
+ for (const auto& pair : values) {
+ benchmark::DoNotOptimize(pair.first * pair.second);
+ }
+ }
+}
+BENCHMARK(BM_MultiplyClass128);
+
+void BM_AddClass128(benchmark::State& state) {
+ auto values = GetRandomClass128Sample();
+ while (state.KeepRunningBatch(values.size())) {
+ for (const auto& pair : values) {
+ benchmark::DoNotOptimize(pair.first + pair.second);
+ }
+ }
+}
+BENCHMARK(BM_AddClass128);
+
+#ifdef ABSL_HAVE_INTRINSIC_INT128
+
+// Some implementations of <random> do not support __int128 when it is
+// available, so we make our own uniform_int_distribution-like type.
+template <typename T,
+ typename H = typename std::conditional<
+ std::is_same<T, __int128>::value, int64_t, uint64_t>::type>
+class UniformIntDistribution128 {
+ public:
+ // NOLINTNEXTLINE: mimicking std::uniform_int_distribution API
+ T operator()(std::mt19937& generator) {
+ return (static_cast<T>(dist64_(generator)) << 64) | dist64_(generator);
+ }
+
+ private:
+ std::uniform_int_distribution<H> dist64_;
+};
+
+template <typename T,
+ typename H = typename std::conditional<
+ std::is_same<T, __int128>::value, int64_t, uint64_t>::type>
+std::vector<std::pair<T, T>> GetRandomIntrinsic128SampleUniformDivisor() {
+ std::vector<std::pair<T, T>> values;
+ std::mt19937 random = MakeRandomEngine();
+ UniformIntDistribution128<T> uniform_128;
+ values.reserve(kSampleSize);
+ for (size_t i = 0; i < kSampleSize; ++i) {
+ T a = uniform_128(random);
+ T b = uniform_128(random);
+ values.emplace_back(std::max(a, b),
+ std::max(static_cast<T>(2), std::min(a, b)));
+ }
+ return values;
+}
+
+template <typename T>
+void BM_DivideIntrinsic128UniformDivisor(benchmark::State& state) {
+ auto values = GetRandomIntrinsic128SampleUniformDivisor<T>();
+ while (state.KeepRunningBatch(values.size())) {
+ for (const auto& pair : values) {
+ benchmark::DoNotOptimize(pair.first / pair.second);
+ }
+ }
+}
+BENCHMARK_TEMPLATE(BM_DivideIntrinsic128UniformDivisor, unsigned __int128);
+BENCHMARK_TEMPLATE(BM_DivideIntrinsic128UniformDivisor, __int128);
+
+template <typename T>
+void BM_RemainderIntrinsic128UniformDivisor(benchmark::State& state) {
+ auto values = GetRandomIntrinsic128SampleUniformDivisor<T>();
+ while (state.KeepRunningBatch(values.size())) {
+ for (const auto& pair : values) {
+ benchmark::DoNotOptimize(pair.first % pair.second);
+ }
+ }
+}
+BENCHMARK_TEMPLATE(BM_RemainderIntrinsic128UniformDivisor, unsigned __int128);
+BENCHMARK_TEMPLATE(BM_RemainderIntrinsic128UniformDivisor, __int128);
+
+template <typename T,
+ typename H = typename std::conditional<
+ std::is_same<T, __int128>::value, int64_t, uint64_t>::type>
+std::vector<std::pair<T, H>> GetRandomIntrinsic128SampleSmallDivisor() {
+ std::vector<std::pair<T, H>> values;
+ std::mt19937 random = MakeRandomEngine();
+ UniformIntDistribution128<T> uniform_int128;
+ std::uniform_int_distribution<H> uniform_int64;
+ values.reserve(kSampleSize);
+ for (size_t i = 0; i < kSampleSize; ++i) {
+ T a = uniform_int128(random);
+ H b = std::max(H{2}, uniform_int64(random));
+ values.emplace_back(std::max(a, static_cast<T>(b)), b);
+ }
+ return values;
+}
+
+template <typename T>
+void BM_DivideIntrinsic128SmallDivisor(benchmark::State& state) {
+ auto values = GetRandomIntrinsic128SampleSmallDivisor<T>();
+ while (state.KeepRunningBatch(values.size())) {
+ for (const auto& pair : values) {
+ benchmark::DoNotOptimize(pair.first / pair.second);
+ }
+ }
+}
+BENCHMARK_TEMPLATE(BM_DivideIntrinsic128SmallDivisor, unsigned __int128);
+BENCHMARK_TEMPLATE(BM_DivideIntrinsic128SmallDivisor, __int128);
+
+template <typename T>
+void BM_RemainderIntrinsic128SmallDivisor(benchmark::State& state) {
+ auto values = GetRandomIntrinsic128SampleSmallDivisor<T>();
+ while (state.KeepRunningBatch(values.size())) {
+ for (const auto& pair : values) {
+ benchmark::DoNotOptimize(pair.first % pair.second);
+ }
+ }
+}
+BENCHMARK_TEMPLATE(BM_RemainderIntrinsic128SmallDivisor, unsigned __int128);
+BENCHMARK_TEMPLATE(BM_RemainderIntrinsic128SmallDivisor, __int128);
+
+std::vector<std::pair<unsigned __int128, unsigned __int128>>
+ GetRandomIntrinsic128Sample() {
+ std::vector<std::pair<unsigned __int128, unsigned __int128>> values;
+ std::mt19937 random = MakeRandomEngine();
+ UniformIntDistribution128<unsigned __int128> uniform_uint128;
+ values.reserve(kSampleSize);
+ for (size_t i = 0; i < kSampleSize; ++i) {
+ values.emplace_back(uniform_uint128(random), uniform_uint128(random));
+ }
+ return values;
+}
+
+void BM_MultiplyIntrinsic128(benchmark::State& state) {
+ auto values = GetRandomIntrinsic128Sample();
+ while (state.KeepRunningBatch(values.size())) {
+ for (const auto& pair : values) {
+ benchmark::DoNotOptimize(pair.first * pair.second);
+ }
+ }
+}
+BENCHMARK(BM_MultiplyIntrinsic128);
+
+void BM_AddIntrinsic128(benchmark::State& state) {
+ auto values = GetRandomIntrinsic128Sample();
+ while (state.KeepRunningBatch(values.size())) {
+ for (const auto& pair : values) {
+ benchmark::DoNotOptimize(pair.first + pair.second);
+ }
+ }
+}
+BENCHMARK(BM_AddIntrinsic128);
+
+#endif // ABSL_HAVE_INTRINSIC_INT128
+
+} // namespace
diff --git a/third_party/abseil/src/absl/numeric/int128_have_intrinsic.inc b/third_party/abseil/src/absl/numeric/int128_have_intrinsic.inc
new file mode 100644
index 0000000..d6c76dd
--- /dev/null
+++ b/third_party/abseil/src/absl/numeric/int128_have_intrinsic.inc
@@ -0,0 +1,302 @@
+//
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// This file contains :int128 implementation details that depend on internal
+// representation when ABSL_HAVE_INTRINSIC_INT128 is defined. This file is
+// included by int128.h and relies on ABSL_INTERNAL_WCHAR_T being defined.
+
+namespace int128_internal {
+
+// Casts from unsigned to signed while preserving the underlying binary
+// representation.
+constexpr __int128 BitCastToSigned(unsigned __int128 v) {
+ // Casting an unsigned integer to a signed integer of the same
+ // width is implementation defined behavior if the source value would not fit
+ // in the destination type. We step around it with a roundtrip bitwise not
+ // operation to make sure this function remains constexpr. Clang and GCC
+ // optimize this to a no-op on x86-64.
+ return v & (static_cast<unsigned __int128>(1) << 127)
+ ? ~static_cast<__int128>(~v)
+ : static_cast<__int128>(v);
+}
+
+} // namespace int128_internal
+
+inline int128& int128::operator=(__int128 v) {
+ v_ = v;
+ return *this;
+}
+
+constexpr uint64_t Int128Low64(int128 v) {
+ return static_cast<uint64_t>(v.v_ & ~uint64_t{0});
+}
+
+constexpr int64_t Int128High64(int128 v) {
+ // Initially cast to unsigned to prevent a right shift on a negative value.
+ return int128_internal::BitCastToSigned(
+ static_cast<uint64_t>(static_cast<unsigned __int128>(v.v_) >> 64));
+}
+
+constexpr int128::int128(int64_t high, uint64_t low)
+ // Initially cast to unsigned to prevent a left shift that overflows.
+ : v_(int128_internal::BitCastToSigned(static_cast<unsigned __int128>(high)
+ << 64) |
+ low) {}
+
+
+constexpr int128::int128(int v) : v_{v} {}
+
+constexpr int128::int128(long v) : v_{v} {} // NOLINT(runtime/int)
+
+constexpr int128::int128(long long v) : v_{v} {} // NOLINT(runtime/int)
+
+constexpr int128::int128(__int128 v) : v_{v} {}
+
+constexpr int128::int128(unsigned int v) : v_{v} {}
+
+constexpr int128::int128(unsigned long v) : v_{v} {} // NOLINT(runtime/int)
+
+// NOLINTNEXTLINE(runtime/int)
+constexpr int128::int128(unsigned long long v) : v_{v} {}
+
+constexpr int128::int128(unsigned __int128 v) : v_{static_cast<__int128>(v)} {}
+
+inline int128::int128(float v) {
+ v_ = static_cast<__int128>(v);
+}
+
+inline int128::int128(double v) {
+ v_ = static_cast<__int128>(v);
+}
+
+inline int128::int128(long double v) {
+ v_ = static_cast<__int128>(v);
+}
+
+constexpr int128::int128(uint128 v) : v_{static_cast<__int128>(v)} {}
+
+constexpr int128::operator bool() const { return static_cast<bool>(v_); }
+
+constexpr int128::operator char() const { return static_cast<char>(v_); }
+
+constexpr int128::operator signed char() const {
+ return static_cast<signed char>(v_);
+}
+
+constexpr int128::operator unsigned char() const {
+ return static_cast<unsigned char>(v_);
+}
+
+constexpr int128::operator char16_t() const {
+ return static_cast<char16_t>(v_);
+}
+
+constexpr int128::operator char32_t() const {
+ return static_cast<char32_t>(v_);
+}
+
+constexpr int128::operator ABSL_INTERNAL_WCHAR_T() const {
+ return static_cast<ABSL_INTERNAL_WCHAR_T>(v_);
+}
+
+constexpr int128::operator short() const { // NOLINT(runtime/int)
+ return static_cast<short>(v_); // NOLINT(runtime/int)
+}
+
+constexpr int128::operator unsigned short() const { // NOLINT(runtime/int)
+ return static_cast<unsigned short>(v_); // NOLINT(runtime/int)
+}
+
+constexpr int128::operator int() const {
+ return static_cast<int>(v_);
+}
+
+constexpr int128::operator unsigned int() const {
+ return static_cast<unsigned int>(v_);
+}
+
+constexpr int128::operator long() const { // NOLINT(runtime/int)
+ return static_cast<long>(v_); // NOLINT(runtime/int)
+}
+
+constexpr int128::operator unsigned long() const { // NOLINT(runtime/int)
+ return static_cast<unsigned long>(v_); // NOLINT(runtime/int)
+}
+
+constexpr int128::operator long long() const { // NOLINT(runtime/int)
+ return static_cast<long long>(v_); // NOLINT(runtime/int)
+}
+
+constexpr int128::operator unsigned long long() const { // NOLINT(runtime/int)
+ return static_cast<unsigned long long>(v_); // NOLINT(runtime/int)
+}
+
+constexpr int128::operator __int128() const { return v_; }
+
+constexpr int128::operator unsigned __int128() const {
+ return static_cast<unsigned __int128>(v_);
+}
+
+// Clang on PowerPC sometimes produces incorrect __int128 to floating point
+// conversions. In that case, we do the conversion with a similar implementation
+// to the conversion operators in int128_no_intrinsic.inc.
+#if defined(__clang__) && !defined(__ppc64__)
+inline int128::operator float() const { return static_cast<float>(v_); }
+
+inline int128::operator double () const { return static_cast<double>(v_); }
+
+inline int128::operator long double() const {
+ return static_cast<long double>(v_);
+}
+
+#else // Clang on PowerPC
+// Forward declaration for conversion operators to floating point types.
+int128 operator-(int128 v);
+bool operator!=(int128 lhs, int128 rhs);
+
+inline int128::operator float() const {
+ // We must convert the absolute value and then negate as needed, because
+ // floating point types are typically sign-magnitude. Otherwise, the
+ // difference between the high and low 64 bits when interpreted as two's
+ // complement overwhelms the precision of the mantissa.
+ //
+ // Also check to make sure we don't negate Int128Min()
+ return v_ < 0 && *this != Int128Min()
+ ? -static_cast<float>(-*this)
+ : static_cast<float>(Int128Low64(*this)) +
+ std::ldexp(static_cast<float>(Int128High64(*this)), 64);
+}
+
+inline int128::operator double() const {
+ // See comment in int128::operator float() above.
+ return v_ < 0 && *this != Int128Min()
+ ? -static_cast<double>(-*this)
+ : static_cast<double>(Int128Low64(*this)) +
+ std::ldexp(static_cast<double>(Int128High64(*this)), 64);
+}
+
+inline int128::operator long double() const {
+ // See comment in int128::operator float() above.
+ return v_ < 0 && *this != Int128Min()
+ ? -static_cast<long double>(-*this)
+ : static_cast<long double>(Int128Low64(*this)) +
+ std::ldexp(static_cast<long double>(Int128High64(*this)),
+ 64);
+}
+#endif // Clang on PowerPC
+
+// Comparison operators.
+
+inline bool operator==(int128 lhs, int128 rhs) {
+ return static_cast<__int128>(lhs) == static_cast<__int128>(rhs);
+}
+
+inline bool operator!=(int128 lhs, int128 rhs) {
+ return static_cast<__int128>(lhs) != static_cast<__int128>(rhs);
+}
+
+inline bool operator<(int128 lhs, int128 rhs) {
+ return static_cast<__int128>(lhs) < static_cast<__int128>(rhs);
+}
+
+inline bool operator>(int128 lhs, int128 rhs) {
+ return static_cast<__int128>(lhs) > static_cast<__int128>(rhs);
+}
+
+inline bool operator<=(int128 lhs, int128 rhs) {
+ return static_cast<__int128>(lhs) <= static_cast<__int128>(rhs);
+}
+
+inline bool operator>=(int128 lhs, int128 rhs) {
+ return static_cast<__int128>(lhs) >= static_cast<__int128>(rhs);
+}
+
+// Unary operators.
+
+inline int128 operator-(int128 v) {
+ return -static_cast<__int128>(v);
+}
+
+inline bool operator!(int128 v) {
+ return !static_cast<__int128>(v);
+}
+
+inline int128 operator~(int128 val) {
+ return ~static_cast<__int128>(val);
+}
+
+// Arithmetic operators.
+
+inline int128 operator+(int128 lhs, int128 rhs) {
+ return static_cast<__int128>(lhs) + static_cast<__int128>(rhs);
+}
+
+inline int128 operator-(int128 lhs, int128 rhs) {
+ return static_cast<__int128>(lhs) - static_cast<__int128>(rhs);
+}
+
+inline int128 operator*(int128 lhs, int128 rhs) {
+ return static_cast<__int128>(lhs) * static_cast<__int128>(rhs);
+}
+
+inline int128 operator/(int128 lhs, int128 rhs) {
+ return static_cast<__int128>(lhs) / static_cast<__int128>(rhs);
+}
+
+inline int128 operator%(int128 lhs, int128 rhs) {
+ return static_cast<__int128>(lhs) % static_cast<__int128>(rhs);
+}
+
+inline int128 int128::operator++(int) {
+ int128 tmp(*this);
+ ++v_;
+ return tmp;
+}
+
+inline int128 int128::operator--(int) {
+ int128 tmp(*this);
+ --v_;
+ return tmp;
+}
+
+inline int128& int128::operator++() {
+ ++v_;
+ return *this;
+}
+
+inline int128& int128::operator--() {
+ --v_;
+ return *this;
+}
+
+inline int128 operator|(int128 lhs, int128 rhs) {
+ return static_cast<__int128>(lhs) | static_cast<__int128>(rhs);
+}
+
+inline int128 operator&(int128 lhs, int128 rhs) {
+ return static_cast<__int128>(lhs) & static_cast<__int128>(rhs);
+}
+
+inline int128 operator^(int128 lhs, int128 rhs) {
+ return static_cast<__int128>(lhs) ^ static_cast<__int128>(rhs);
+}
+
+inline int128 operator<<(int128 lhs, int amount) {
+ return static_cast<__int128>(lhs) << amount;
+}
+
+inline int128 operator>>(int128 lhs, int amount) {
+ return static_cast<__int128>(lhs) >> amount;
+}
diff --git a/third_party/abseil/src/absl/numeric/int128_no_intrinsic.inc b/third_party/abseil/src/absl/numeric/int128_no_intrinsic.inc
new file mode 100644
index 0000000..c753771
--- /dev/null
+++ b/third_party/abseil/src/absl/numeric/int128_no_intrinsic.inc
@@ -0,0 +1,308 @@
+//
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// This file contains :int128 implementation details that depend on internal
+// representation when ABSL_HAVE_INTRINSIC_INT128 is *not* defined. This file
+// is included by int128.h and relies on ABSL_INTERNAL_WCHAR_T being defined.
+
+constexpr uint64_t Int128Low64(int128 v) { return v.lo_; }
+
+constexpr int64_t Int128High64(int128 v) { return v.hi_; }
+
+#if defined(ABSL_IS_LITTLE_ENDIAN)
+
+constexpr int128::int128(int64_t high, uint64_t low) :
+ lo_(low), hi_(high) {}
+
+constexpr int128::int128(int v)
+ : lo_{static_cast<uint64_t>(v)}, hi_{v < 0 ? ~int64_t{0} : 0} {}
+constexpr int128::int128(long v) // NOLINT(runtime/int)
+ : lo_{static_cast<uint64_t>(v)}, hi_{v < 0 ? ~int64_t{0} : 0} {}
+constexpr int128::int128(long long v) // NOLINT(runtime/int)
+ : lo_{static_cast<uint64_t>(v)}, hi_{v < 0 ? ~int64_t{0} : 0} {}
+
+constexpr int128::int128(unsigned int v) : lo_{v}, hi_{0} {}
+// NOLINTNEXTLINE(runtime/int)
+constexpr int128::int128(unsigned long v) : lo_{v}, hi_{0} {}
+// NOLINTNEXTLINE(runtime/int)
+constexpr int128::int128(unsigned long long v) : lo_{v}, hi_{0} {}
+
+constexpr int128::int128(uint128 v)
+ : lo_{Uint128Low64(v)}, hi_{static_cast<int64_t>(Uint128High64(v))} {}
+
+#elif defined(ABSL_IS_BIG_ENDIAN)
+
+constexpr int128::int128(int64_t high, uint64_t low) :
+ hi_{high}, lo_{low} {}
+
+constexpr int128::int128(int v)
+ : hi_{v < 0 ? ~int64_t{0} : 0}, lo_{static_cast<uint64_t>(v)} {}
+constexpr int128::int128(long v) // NOLINT(runtime/int)
+ : hi_{v < 0 ? ~int64_t{0} : 0}, lo_{static_cast<uint64_t>(v)} {}
+constexpr int128::int128(long long v) // NOLINT(runtime/int)
+ : hi_{v < 0 ? ~int64_t{0} : 0}, lo_{static_cast<uint64_t>(v)} {}
+
+constexpr int128::int128(unsigned int v) : hi_{0}, lo_{v} {}
+// NOLINTNEXTLINE(runtime/int)
+constexpr int128::int128(unsigned long v) : hi_{0}, lo_{v} {}
+// NOLINTNEXTLINE(runtime/int)
+constexpr int128::int128(unsigned long long v) : hi_{0}, lo_{v} {}
+
+constexpr int128::int128(uint128 v)
+ : hi_{static_cast<int64_t>(Uint128High64(v))}, lo_{Uint128Low64(v)} {}
+
+#else // byte order
+#error "Unsupported byte order: must be little-endian or big-endian."
+#endif // byte order
+
+constexpr int128::operator bool() const { return lo_ || hi_; }
+
+constexpr int128::operator char() const {
+ // NOLINTNEXTLINE(runtime/int)
+ return static_cast<char>(static_cast<long long>(*this));
+}
+
+constexpr int128::operator signed char() const {
+ // NOLINTNEXTLINE(runtime/int)
+ return static_cast<signed char>(static_cast<long long>(*this));
+}
+
+constexpr int128::operator unsigned char() const {
+ return static_cast<unsigned char>(lo_);
+}
+
+constexpr int128::operator char16_t() const {
+ return static_cast<char16_t>(lo_);
+}
+
+constexpr int128::operator char32_t() const {
+ return static_cast<char32_t>(lo_);
+}
+
+constexpr int128::operator ABSL_INTERNAL_WCHAR_T() const {
+ // NOLINTNEXTLINE(runtime/int)
+ return static_cast<ABSL_INTERNAL_WCHAR_T>(static_cast<long long>(*this));
+}
+
+constexpr int128::operator short() const { // NOLINT(runtime/int)
+ // NOLINTNEXTLINE(runtime/int)
+ return static_cast<short>(static_cast<long long>(*this));
+}
+
+constexpr int128::operator unsigned short() const { // NOLINT(runtime/int)
+ return static_cast<unsigned short>(lo_); // NOLINT(runtime/int)
+}
+
+constexpr int128::operator int() const {
+ // NOLINTNEXTLINE(runtime/int)
+ return static_cast<int>(static_cast<long long>(*this));
+}
+
+constexpr int128::operator unsigned int() const {
+ return static_cast<unsigned int>(lo_);
+}
+
+constexpr int128::operator long() const { // NOLINT(runtime/int)
+ // NOLINTNEXTLINE(runtime/int)
+ return static_cast<long>(static_cast<long long>(*this));
+}
+
+constexpr int128::operator unsigned long() const { // NOLINT(runtime/int)
+ return static_cast<unsigned long>(lo_); // NOLINT(runtime/int)
+}
+
+constexpr int128::operator long long() const { // NOLINT(runtime/int)
+ // We don't bother checking the value of hi_. If *this < 0, lo_'s high bit
+ // must be set in order for the value to fit into a long long. Conversely, if
+ // lo_'s high bit is set, *this must be < 0 for the value to fit.
+ return int128_internal::BitCastToSigned(lo_);
+}
+
+constexpr int128::operator unsigned long long() const { // NOLINT(runtime/int)
+ return static_cast<unsigned long long>(lo_); // NOLINT(runtime/int)
+}
+
+// Forward declaration for conversion operators to floating point types.
+int128 operator-(int128 v);
+bool operator!=(int128 lhs, int128 rhs);
+
+inline int128::operator float() const {
+ // We must convert the absolute value and then negate as needed, because
+ // floating point types are typically sign-magnitude. Otherwise, the
+ // difference between the high and low 64 bits when interpreted as two's
+ // complement overwhelms the precision of the mantissa.
+ //
+ // Also check to make sure we don't negate Int128Min()
+ return hi_ < 0 && *this != Int128Min()
+ ? -static_cast<float>(-*this)
+ : static_cast<float>(lo_) +
+ std::ldexp(static_cast<float>(hi_), 64);
+}
+
+inline int128::operator double() const {
+ // See comment in int128::operator float() above.
+ return hi_ < 0 && *this != Int128Min()
+ ? -static_cast<double>(-*this)
+ : static_cast<double>(lo_) +
+ std::ldexp(static_cast<double>(hi_), 64);
+}
+
+inline int128::operator long double() const {
+ // See comment in int128::operator float() above.
+ return hi_ < 0 && *this != Int128Min()
+ ? -static_cast<long double>(-*this)
+ : static_cast<long double>(lo_) +
+ std::ldexp(static_cast<long double>(hi_), 64);
+}
+
+// Comparison operators.
+
+inline bool operator==(int128 lhs, int128 rhs) {
+ return (Int128Low64(lhs) == Int128Low64(rhs) &&
+ Int128High64(lhs) == Int128High64(rhs));
+}
+
+inline bool operator!=(int128 lhs, int128 rhs) {
+ return !(lhs == rhs);
+}
+
+inline bool operator<(int128 lhs, int128 rhs) {
+ return (Int128High64(lhs) == Int128High64(rhs))
+ ? (Int128Low64(lhs) < Int128Low64(rhs))
+ : (Int128High64(lhs) < Int128High64(rhs));
+}
+
+inline bool operator>(int128 lhs, int128 rhs) {
+ return (Int128High64(lhs) == Int128High64(rhs))
+ ? (Int128Low64(lhs) > Int128Low64(rhs))
+ : (Int128High64(lhs) > Int128High64(rhs));
+}
+
+inline bool operator<=(int128 lhs, int128 rhs) {
+ return !(lhs > rhs);
+}
+
+inline bool operator>=(int128 lhs, int128 rhs) {
+ return !(lhs < rhs);
+}
+
+// Unary operators.
+
+inline int128 operator-(int128 v) {
+ int64_t hi = ~Int128High64(v);
+ uint64_t lo = ~Int128Low64(v) + 1;
+ if (lo == 0) ++hi; // carry
+ return MakeInt128(hi, lo);
+}
+
+inline bool operator!(int128 v) {
+ return !Int128Low64(v) && !Int128High64(v);
+}
+
+inline int128 operator~(int128 val) {
+ return MakeInt128(~Int128High64(val), ~Int128Low64(val));
+}
+
+// Arithmetic operators.
+
+inline int128 operator+(int128 lhs, int128 rhs) {
+ int128 result = MakeInt128(Int128High64(lhs) + Int128High64(rhs),
+ Int128Low64(lhs) + Int128Low64(rhs));
+ if (Int128Low64(result) < Int128Low64(lhs)) { // check for carry
+ return MakeInt128(Int128High64(result) + 1, Int128Low64(result));
+ }
+ return result;
+}
+
+inline int128 operator-(int128 lhs, int128 rhs) {
+ int128 result = MakeInt128(Int128High64(lhs) - Int128High64(rhs),
+ Int128Low64(lhs) - Int128Low64(rhs));
+ if (Int128Low64(lhs) < Int128Low64(rhs)) { // check for carry
+ return MakeInt128(Int128High64(result) - 1, Int128Low64(result));
+ }
+ return result;
+}
+
+inline int128 operator*(int128 lhs, int128 rhs) {
+ uint128 result = uint128(lhs) * rhs;
+ return MakeInt128(int128_internal::BitCastToSigned(Uint128High64(result)),
+ Uint128Low64(result));
+}
+
+inline int128 int128::operator++(int) {
+ int128 tmp(*this);
+ *this += 1;
+ return tmp;
+}
+
+inline int128 int128::operator--(int) {
+ int128 tmp(*this);
+ *this -= 1;
+ return tmp;
+}
+
+inline int128& int128::operator++() {
+ *this += 1;
+ return *this;
+}
+
+inline int128& int128::operator--() {
+ *this -= 1;
+ return *this;
+}
+
+inline int128 operator|(int128 lhs, int128 rhs) {
+ return MakeInt128(Int128High64(lhs) | Int128High64(rhs),
+ Int128Low64(lhs) | Int128Low64(rhs));
+}
+
+inline int128 operator&(int128 lhs, int128 rhs) {
+ return MakeInt128(Int128High64(lhs) & Int128High64(rhs),
+ Int128Low64(lhs) & Int128Low64(rhs));
+}
+
+inline int128 operator^(int128 lhs, int128 rhs) {
+ return MakeInt128(Int128High64(lhs) ^ Int128High64(rhs),
+ Int128Low64(lhs) ^ Int128Low64(rhs));
+}
+
+inline int128 operator<<(int128 lhs, int amount) {
+ // uint64_t shifts of >= 64 are undefined, so we need some special-casing.
+ if (amount < 64) {
+ if (amount != 0) {
+ return MakeInt128(
+ (Int128High64(lhs) << amount) |
+ static_cast<int64_t>(Int128Low64(lhs) >> (64 - amount)),
+ Int128Low64(lhs) << amount);
+ }
+ return lhs;
+ }
+ return MakeInt128(static_cast<int64_t>(Int128Low64(lhs) << (amount - 64)), 0);
+}
+
+inline int128 operator>>(int128 lhs, int amount) {
+ // uint64_t shifts of >= 64 are undefined, so we need some special-casing.
+ if (amount < 64) {
+ if (amount != 0) {
+ return MakeInt128(
+ Int128High64(lhs) >> amount,
+ (Int128Low64(lhs) >> amount) |
+ (static_cast<uint64_t>(Int128High64(lhs)) << (64 - amount)));
+ }
+ return lhs;
+ }
+ return MakeInt128(0,
+ static_cast<uint64_t>(Int128High64(lhs) >> (amount - 64)));
+}
diff --git a/third_party/abseil/src/absl/numeric/int128_stream_test.cc b/third_party/abseil/src/absl/numeric/int128_stream_test.cc
new file mode 100644
index 0000000..479ad66
--- /dev/null
+++ b/third_party/abseil/src/absl/numeric/int128_stream_test.cc
@@ -0,0 +1,1395 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/numeric/int128.h"
+
+#include <sstream>
+#include <string>
+
+#include "gtest/gtest.h"
+
+namespace {
+
+struct Uint128TestCase {
+ absl::uint128 value;
+ std::ios_base::fmtflags flags;
+ std::streamsize width;
+ const char* expected;
+};
+
+constexpr char kFill = '_';
+
+std::string StreamFormatToString(std::ios_base::fmtflags flags,
+ std::streamsize width) {
+ std::vector<const char*> flagstr;
+ switch (flags & std::ios::basefield) {
+ case std::ios::dec:
+ flagstr.push_back("std::ios::dec");
+ break;
+ case std::ios::oct:
+ flagstr.push_back("std::ios::oct");
+ break;
+ case std::ios::hex:
+ flagstr.push_back("std::ios::hex");
+ break;
+ default: // basefield not specified
+ break;
+ }
+ switch (flags & std::ios::adjustfield) {
+ case std::ios::left:
+ flagstr.push_back("std::ios::left");
+ break;
+ case std::ios::internal:
+ flagstr.push_back("std::ios::internal");
+ break;
+ case std::ios::right:
+ flagstr.push_back("std::ios::right");
+ break;
+ default: // adjustfield not specified
+ break;
+ }
+ if (flags & std::ios::uppercase) flagstr.push_back("std::ios::uppercase");
+ if (flags & std::ios::showbase) flagstr.push_back("std::ios::showbase");
+ if (flags & std::ios::showpos) flagstr.push_back("std::ios::showpos");
+
+ std::ostringstream msg;
+ msg << "\n StreamFormatToString(test_case.flags, test_case.width)\n "
+ "flags: ";
+ if (!flagstr.empty()) {
+ for (size_t i = 0; i < flagstr.size() - 1; ++i) msg << flagstr[i] << " | ";
+ msg << flagstr.back();
+ } else {
+ msg << "(default)";
+ }
+ msg << "\n width: " << width << "\n fill: '" << kFill << "'";
+ return msg.str();
+}
+
+void CheckUint128Case(const Uint128TestCase& test_case) {
+ std::ostringstream os;
+ os.flags(test_case.flags);
+ os.width(test_case.width);
+ os.fill(kFill);
+ os << test_case.value;
+ SCOPED_TRACE(StreamFormatToString(test_case.flags, test_case.width));
+ EXPECT_EQ(test_case.expected, os.str());
+}
+
+constexpr std::ios::fmtflags kDec = std::ios::dec;
+constexpr std::ios::fmtflags kOct = std::ios::oct;
+constexpr std::ios::fmtflags kHex = std::ios::hex;
+constexpr std::ios::fmtflags kLeft = std::ios::left;
+constexpr std::ios::fmtflags kInt = std::ios::internal;
+constexpr std::ios::fmtflags kRight = std::ios::right;
+constexpr std::ios::fmtflags kUpper = std::ios::uppercase;
+constexpr std::ios::fmtflags kBase = std::ios::showbase;
+constexpr std::ios::fmtflags kPos = std::ios::showpos;
+
+TEST(Uint128, OStreamValueTest) {
+ CheckUint128Case({1, kDec, /*width = */ 0, "1"});
+ CheckUint128Case({1, kOct, /*width = */ 0, "1"});
+ CheckUint128Case({1, kHex, /*width = */ 0, "1"});
+ CheckUint128Case({9, kDec, /*width = */ 0, "9"});
+ CheckUint128Case({9, kOct, /*width = */ 0, "11"});
+ CheckUint128Case({9, kHex, /*width = */ 0, "9"});
+ CheckUint128Case({12345, kDec, /*width = */ 0, "12345"});
+ CheckUint128Case({12345, kOct, /*width = */ 0, "30071"});
+ CheckUint128Case({12345, kHex, /*width = */ 0, "3039"});
+ CheckUint128Case(
+ {0x8000000000000000, kDec, /*width = */ 0, "9223372036854775808"});
+ CheckUint128Case(
+ {0x8000000000000000, kOct, /*width = */ 0, "1000000000000000000000"});
+ CheckUint128Case(
+ {0x8000000000000000, kHex, /*width = */ 0, "8000000000000000"});
+ CheckUint128Case({std::numeric_limits<uint64_t>::max(), kDec,
+ /*width = */ 0, "18446744073709551615"});
+ CheckUint128Case({std::numeric_limits<uint64_t>::max(), kOct,
+ /*width = */ 0, "1777777777777777777777"});
+ CheckUint128Case({std::numeric_limits<uint64_t>::max(), kHex,
+ /*width = */ 0, "ffffffffffffffff"});
+ CheckUint128Case(
+ {absl::MakeUint128(1, 0), kDec, /*width = */ 0, "18446744073709551616"});
+ CheckUint128Case({absl::MakeUint128(1, 0), kOct, /*width = */ 0,
+ "2000000000000000000000"});
+ CheckUint128Case(
+ {absl::MakeUint128(1, 0), kHex, /*width = */ 0, "10000000000000000"});
+ CheckUint128Case({absl::MakeUint128(0x8000000000000000, 0), kDec,
+ /*width = */ 0, "170141183460469231731687303715884105728"});
+ CheckUint128Case({absl::MakeUint128(0x8000000000000000, 0), kOct,
+ /*width = */ 0,
+ "2000000000000000000000000000000000000000000"});
+ CheckUint128Case({absl::MakeUint128(0x8000000000000000, 0), kHex,
+ /*width = */ 0, "80000000000000000000000000000000"});
+ CheckUint128Case({absl::kuint128max, kDec, /*width = */ 0,
+ "340282366920938463463374607431768211455"});
+ CheckUint128Case({absl::kuint128max, kOct, /*width = */ 0,
+ "3777777777777777777777777777777777777777777"});
+ CheckUint128Case({absl::kuint128max, kHex, /*width = */ 0,
+ "ffffffffffffffffffffffffffffffff"});
+}
+
+std::vector<Uint128TestCase> GetUint128FormatCases();
+
+TEST(Uint128, OStreamFormatTest) {
+ for (const Uint128TestCase& test_case : GetUint128FormatCases()) {
+ CheckUint128Case(test_case);
+ }
+}
+
+struct Int128TestCase {
+ absl::int128 value;
+ std::ios_base::fmtflags flags;
+ std::streamsize width;
+ const char* expected;
+};
+
+void CheckInt128Case(const Int128TestCase& test_case) {
+ std::ostringstream os;
+ os.flags(test_case.flags);
+ os.width(test_case.width);
+ os.fill(kFill);
+ os << test_case.value;
+ SCOPED_TRACE(StreamFormatToString(test_case.flags, test_case.width));
+ EXPECT_EQ(test_case.expected, os.str());
+}
+
+TEST(Int128, OStreamValueTest) {
+ CheckInt128Case({1, kDec, /*width = */ 0, "1"});
+ CheckInt128Case({1, kOct, /*width = */ 0, "1"});
+ CheckInt128Case({1, kHex, /*width = */ 0, "1"});
+ CheckInt128Case({9, kDec, /*width = */ 0, "9"});
+ CheckInt128Case({9, kOct, /*width = */ 0, "11"});
+ CheckInt128Case({9, kHex, /*width = */ 0, "9"});
+ CheckInt128Case({12345, kDec, /*width = */ 0, "12345"});
+ CheckInt128Case({12345, kOct, /*width = */ 0, "30071"});
+ CheckInt128Case({12345, kHex, /*width = */ 0, "3039"});
+ CheckInt128Case(
+ {0x8000000000000000, kDec, /*width = */ 0, "9223372036854775808"});
+ CheckInt128Case(
+ {0x8000000000000000, kOct, /*width = */ 0, "1000000000000000000000"});
+ CheckInt128Case(
+ {0x8000000000000000, kHex, /*width = */ 0, "8000000000000000"});
+ CheckInt128Case({std::numeric_limits<uint64_t>::max(), kDec,
+ /*width = */ 0, "18446744073709551615"});
+ CheckInt128Case({std::numeric_limits<uint64_t>::max(), kOct,
+ /*width = */ 0, "1777777777777777777777"});
+ CheckInt128Case({std::numeric_limits<uint64_t>::max(), kHex,
+ /*width = */ 0, "ffffffffffffffff"});
+ CheckInt128Case(
+ {absl::MakeInt128(1, 0), kDec, /*width = */ 0, "18446744073709551616"});
+ CheckInt128Case(
+ {absl::MakeInt128(1, 0), kOct, /*width = */ 0, "2000000000000000000000"});
+ CheckInt128Case(
+ {absl::MakeInt128(1, 0), kHex, /*width = */ 0, "10000000000000000"});
+ CheckInt128Case({absl::MakeInt128(std::numeric_limits<int64_t>::max(),
+ std::numeric_limits<uint64_t>::max()),
+ std::ios::dec, /*width = */ 0,
+ "170141183460469231731687303715884105727"});
+ CheckInt128Case({absl::MakeInt128(std::numeric_limits<int64_t>::max(),
+ std::numeric_limits<uint64_t>::max()),
+ std::ios::oct, /*width = */ 0,
+ "1777777777777777777777777777777777777777777"});
+ CheckInt128Case({absl::MakeInt128(std::numeric_limits<int64_t>::max(),
+ std::numeric_limits<uint64_t>::max()),
+ std::ios::hex, /*width = */ 0,
+ "7fffffffffffffffffffffffffffffff"});
+ CheckInt128Case({absl::MakeInt128(std::numeric_limits<int64_t>::min(), 0),
+ std::ios::dec, /*width = */ 0,
+ "-170141183460469231731687303715884105728"});
+ CheckInt128Case({absl::MakeInt128(std::numeric_limits<int64_t>::min(), 0),
+ std::ios::oct, /*width = */ 0,
+ "2000000000000000000000000000000000000000000"});
+ CheckInt128Case({absl::MakeInt128(std::numeric_limits<int64_t>::min(), 0),
+ std::ios::hex, /*width = */ 0,
+ "80000000000000000000000000000000"});
+ CheckInt128Case({-1, std::ios::dec, /*width = */ 0, "-1"});
+ CheckInt128Case({-1, std::ios::oct, /*width = */ 0,
+ "3777777777777777777777777777777777777777777"});
+ CheckInt128Case(
+ {-1, std::ios::hex, /*width = */ 0, "ffffffffffffffffffffffffffffffff"});
+ CheckInt128Case({-12345, std::ios::dec, /*width = */ 0, "-12345"});
+ CheckInt128Case({-12345, std::ios::oct, /*width = */ 0,
+ "3777777777777777777777777777777777777747707"});
+ CheckInt128Case({-12345, std::ios::hex, /*width = */ 0,
+ "ffffffffffffffffffffffffffffcfc7"});
+}
+
+std::vector<Int128TestCase> GetInt128FormatCases();
+TEST(Int128, OStreamFormatTest) {
+ for (const Int128TestCase& test_case : GetInt128FormatCases()) {
+ CheckInt128Case(test_case);
+ }
+}
+
+std::vector<Int128TestCase> GetInt128FormatCases() {
+ return {
+ {0, std::ios_base::fmtflags(), /*width = */ 0, "0"},
+ {0, std::ios_base::fmtflags(), /*width = */ 6, "_____0"},
+ {0, kPos, /*width = */ 0, "+0"},
+ {0, kPos, /*width = */ 6, "____+0"},
+ {0, kBase, /*width = */ 0, "0"},
+ {0, kBase, /*width = */ 6, "_____0"},
+ {0, kBase | kPos, /*width = */ 0, "+0"},
+ {0, kBase | kPos, /*width = */ 6, "____+0"},
+ {0, kUpper, /*width = */ 0, "0"},
+ {0, kUpper, /*width = */ 6, "_____0"},
+ {0, kUpper | kPos, /*width = */ 0, "+0"},
+ {0, kUpper | kPos, /*width = */ 6, "____+0"},
+ {0, kUpper | kBase, /*width = */ 0, "0"},
+ {0, kUpper | kBase, /*width = */ 6, "_____0"},
+ {0, kUpper | kBase | kPos, /*width = */ 0, "+0"},
+ {0, kUpper | kBase | kPos, /*width = */ 6, "____+0"},
+ {0, kLeft, /*width = */ 0, "0"},
+ {0, kLeft, /*width = */ 6, "0_____"},
+ {0, kLeft | kPos, /*width = */ 0, "+0"},
+ {0, kLeft | kPos, /*width = */ 6, "+0____"},
+ {0, kLeft | kBase, /*width = */ 0, "0"},
+ {0, kLeft | kBase, /*width = */ 6, "0_____"},
+ {0, kLeft | kBase | kPos, /*width = */ 0, "+0"},
+ {0, kLeft | kBase | kPos, /*width = */ 6, "+0____"},
+ {0, kLeft | kUpper, /*width = */ 0, "0"},
+ {0, kLeft | kUpper, /*width = */ 6, "0_____"},
+ {0, kLeft | kUpper | kPos, /*width = */ 0, "+0"},
+ {0, kLeft | kUpper | kPos, /*width = */ 6, "+0____"},
+ {0, kLeft | kUpper | kBase, /*width = */ 0, "0"},
+ {0, kLeft | kUpper | kBase, /*width = */ 6, "0_____"},
+ {0, kLeft | kUpper | kBase | kPos, /*width = */ 0, "+0"},
+ {0, kLeft | kUpper | kBase | kPos, /*width = */ 6, "+0____"},
+ {0, kInt, /*width = */ 0, "0"},
+ {0, kInt, /*width = */ 6, "_____0"},
+ {0, kInt | kPos, /*width = */ 0, "+0"},
+ {0, kInt | kPos, /*width = */ 6, "+____0"},
+ {0, kInt | kBase, /*width = */ 0, "0"},
+ {0, kInt | kBase, /*width = */ 6, "_____0"},
+ {0, kInt | kBase | kPos, /*width = */ 0, "+0"},
+ {0, kInt | kBase | kPos, /*width = */ 6, "+____0"},
+ {0, kInt | kUpper, /*width = */ 0, "0"},
+ {0, kInt | kUpper, /*width = */ 6, "_____0"},
+ {0, kInt | kUpper | kPos, /*width = */ 0, "+0"},
+ {0, kInt | kUpper | kPos, /*width = */ 6, "+____0"},
+ {0, kInt | kUpper | kBase, /*width = */ 0, "0"},
+ {0, kInt | kUpper | kBase, /*width = */ 6, "_____0"},
+ {0, kInt | kUpper | kBase | kPos, /*width = */ 0, "+0"},
+ {0, kInt | kUpper | kBase | kPos, /*width = */ 6, "+____0"},
+ {0, kRight, /*width = */ 0, "0"},
+ {0, kRight, /*width = */ 6, "_____0"},
+ {0, kRight | kPos, /*width = */ 0, "+0"},
+ {0, kRight | kPos, /*width = */ 6, "____+0"},
+ {0, kRight | kBase, /*width = */ 0, "0"},
+ {0, kRight | kBase, /*width = */ 6, "_____0"},
+ {0, kRight | kBase | kPos, /*width = */ 0, "+0"},
+ {0, kRight | kBase | kPos, /*width = */ 6, "____+0"},
+ {0, kRight | kUpper, /*width = */ 0, "0"},
+ {0, kRight | kUpper, /*width = */ 6, "_____0"},
+ {0, kRight | kUpper | kPos, /*width = */ 0, "+0"},
+ {0, kRight | kUpper | kPos, /*width = */ 6, "____+0"},
+ {0, kRight | kUpper | kBase, /*width = */ 0, "0"},
+ {0, kRight | kUpper | kBase, /*width = */ 6, "_____0"},
+ {0, kRight | kUpper | kBase | kPos, /*width = */ 0, "+0"},
+ {0, kRight | kUpper | kBase | kPos, /*width = */ 6, "____+0"},
+ {0, kDec, /*width = */ 0, "0"},
+ {0, kDec, /*width = */ 6, "_____0"},
+ {0, kDec | kPos, /*width = */ 0, "+0"},
+ {0, kDec | kPos, /*width = */ 6, "____+0"},
+ {0, kDec | kBase, /*width = */ 0, "0"},
+ {0, kDec | kBase, /*width = */ 6, "_____0"},
+ {0, kDec | kBase | kPos, /*width = */ 0, "+0"},
+ {0, kDec | kBase | kPos, /*width = */ 6, "____+0"},
+ {0, kDec | kUpper, /*width = */ 0, "0"},
+ {0, kDec | kUpper, /*width = */ 6, "_____0"},
+ {0, kDec | kUpper | kPos, /*width = */ 0, "+0"},
+ {0, kDec | kUpper | kPos, /*width = */ 6, "____+0"},
+ {0, kDec | kUpper | kBase, /*width = */ 0, "0"},
+ {0, kDec | kUpper | kBase, /*width = */ 6, "_____0"},
+ {0, kDec | kUpper | kBase | kPos, /*width = */ 0, "+0"},
+ {0, kDec | kUpper | kBase | kPos, /*width = */ 6, "____+0"},
+ {0, kDec | kLeft, /*width = */ 0, "0"},
+ {0, kDec | kLeft, /*width = */ 6, "0_____"},
+ {0, kDec | kLeft | kPos, /*width = */ 0, "+0"},
+ {0, kDec | kLeft | kPos, /*width = */ 6, "+0____"},
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+ {42, kOct | kLeft | kBase | kPos, /*width = */ 6, "052___"},
+ {42, kOct | kLeft | kUpper, /*width = */ 0, "52"},
+ {42, kOct | kLeft | kUpper, /*width = */ 6, "52____"},
+ {42, kOct | kLeft | kUpper | kPos, /*width = */ 0, "52"},
+ {42, kOct | kLeft | kUpper | kPos, /*width = */ 6, "52____"},
+ {42, kOct | kLeft | kUpper | kBase, /*width = */ 0, "052"},
+ {42, kOct | kLeft | kUpper | kBase, /*width = */ 6, "052___"},
+ {42, kOct | kLeft | kUpper | kBase | kPos, /*width = */ 0, "052"},
+ {42, kOct | kLeft | kUpper | kBase | kPos, /*width = */ 6, "052___"},
+ {42, kOct | kInt, /*width = */ 0, "52"},
+ {42, kOct | kInt, /*width = */ 6, "____52"},
+ {42, kOct | kInt | kPos, /*width = */ 0, "52"},
+ {42, kOct | kInt | kPos, /*width = */ 6, "____52"},
+ {42, kOct | kInt | kBase, /*width = */ 0, "052"},
+ {42, kOct | kInt | kBase, /*width = */ 6, "___052"},
+ {42, kOct | kInt | kBase | kPos, /*width = */ 0, "052"},
+ {42, kOct | kInt | kBase | kPos, /*width = */ 6, "___052"},
+ {42, kOct | kInt | kUpper, /*width = */ 0, "52"},
+ {42, kOct | kInt | kUpper, /*width = */ 6, "____52"},
+ {42, kOct | kInt | kUpper | kPos, /*width = */ 0, "52"},
+ {42, kOct | kInt | kUpper | kPos, /*width = */ 6, "____52"},
+ {42, kOct | kInt | kUpper | kBase, /*width = */ 0, "052"},
+ {42, kOct | kInt | kUpper | kBase, /*width = */ 6, "___052"},
+ {42, kOct | kInt | kUpper | kBase | kPos, /*width = */ 0, "052"},
+ {42, kOct | kInt | kUpper | kBase | kPos, /*width = */ 6, "___052"},
+ {42, kOct | kRight, /*width = */ 0, "52"},
+ {42, kOct | kRight, /*width = */ 6, "____52"},
+ {42, kOct | kRight | kPos, /*width = */ 0, "52"},
+ {42, kOct | kRight | kPos, /*width = */ 6, "____52"},
+ {42, kOct | kRight | kBase, /*width = */ 0, "052"},
+ {42, kOct | kRight | kBase, /*width = */ 6, "___052"},
+ {42, kOct | kRight | kBase | kPos, /*width = */ 0, "052"},
+ {42, kOct | kRight | kBase | kPos, /*width = */ 6, "___052"},
+ {42, kOct | kRight | kUpper, /*width = */ 0, "52"},
+ {42, kOct | kRight | kUpper, /*width = */ 6, "____52"},
+ {42, kOct | kRight | kUpper | kPos, /*width = */ 0, "52"},
+ {42, kOct | kRight | kUpper | kPos, /*width = */ 6, "____52"},
+ {42, kOct | kRight | kUpper | kBase, /*width = */ 0, "052"},
+ {42, kOct | kRight | kUpper | kBase, /*width = */ 6, "___052"},
+ {42, kOct | kRight | kUpper | kBase | kPos, /*width = */ 0, "052"},
+ {42, kOct | kRight | kUpper | kBase | kPos, /*width = */ 6, "___052"},
+ {42, kHex, /*width = */ 0, "2a"},
+ {42, kHex, /*width = */ 6, "____2a"},
+ {42, kHex | kPos, /*width = */ 0, "2a"},
+ {42, kHex | kPos, /*width = */ 6, "____2a"},
+ {42, kHex | kBase, /*width = */ 0, "0x2a"},
+ {42, kHex | kBase, /*width = */ 6, "__0x2a"},
+ {42, kHex | kBase | kPos, /*width = */ 0, "0x2a"},
+ {42, kHex | kBase | kPos, /*width = */ 6, "__0x2a"},
+ {42, kHex | kUpper, /*width = */ 0, "2A"},
+ {42, kHex | kUpper, /*width = */ 6, "____2A"},
+ {42, kHex | kUpper | kPos, /*width = */ 0, "2A"},
+ {42, kHex | kUpper | kPos, /*width = */ 6, "____2A"},
+ {42, kHex | kUpper | kBase, /*width = */ 0, "0X2A"},
+ {42, kHex | kUpper | kBase, /*width = */ 6, "__0X2A"},
+ {42, kHex | kUpper | kBase | kPos, /*width = */ 0, "0X2A"},
+ {42, kHex | kUpper | kBase | kPos, /*width = */ 6, "__0X2A"},
+ {42, kHex | kLeft, /*width = */ 0, "2a"},
+ {42, kHex | kLeft, /*width = */ 6, "2a____"},
+ {42, kHex | kLeft | kPos, /*width = */ 0, "2a"},
+ {42, kHex | kLeft | kPos, /*width = */ 6, "2a____"},
+ {42, kHex | kLeft | kBase, /*width = */ 0, "0x2a"},
+ {42, kHex | kLeft | kBase, /*width = */ 6, "0x2a__"},
+ {42, kHex | kLeft | kBase | kPos, /*width = */ 0, "0x2a"},
+ {42, kHex | kLeft | kBase | kPos, /*width = */ 6, "0x2a__"},
+ {42, kHex | kLeft | kUpper, /*width = */ 0, "2A"},
+ {42, kHex | kLeft | kUpper, /*width = */ 6, "2A____"},
+ {42, kHex | kLeft | kUpper | kPos, /*width = */ 0, "2A"},
+ {42, kHex | kLeft | kUpper | kPos, /*width = */ 6, "2A____"},
+ {42, kHex | kLeft | kUpper | kBase, /*width = */ 0, "0X2A"},
+ {42, kHex | kLeft | kUpper | kBase, /*width = */ 6, "0X2A__"},
+ {42, kHex | kLeft | kUpper | kBase | kPos, /*width = */ 0, "0X2A"},
+ {42, kHex | kLeft | kUpper | kBase | kPos, /*width = */ 6, "0X2A__"},
+ {42, kHex | kInt, /*width = */ 0, "2a"},
+ {42, kHex | kInt, /*width = */ 6, "____2a"},
+ {42, kHex | kInt | kPos, /*width = */ 0, "2a"},
+ {42, kHex | kInt | kPos, /*width = */ 6, "____2a"},
+ {42, kHex | kInt | kBase, /*width = */ 0, "0x2a"},
+ {42, kHex | kInt | kBase, /*width = */ 6, "0x__2a"},
+ {42, kHex | kInt | kBase | kPos, /*width = */ 0, "0x2a"},
+ {42, kHex | kInt | kBase | kPos, /*width = */ 6, "0x__2a"},
+ {42, kHex | kInt | kUpper, /*width = */ 0, "2A"},
+ {42, kHex | kInt | kUpper, /*width = */ 6, "____2A"},
+ {42, kHex | kInt | kUpper | kPos, /*width = */ 0, "2A"},
+ {42, kHex | kInt | kUpper | kPos, /*width = */ 6, "____2A"},
+ {42, kHex | kInt | kUpper | kBase, /*width = */ 0, "0X2A"},
+ {42, kHex | kInt | kUpper | kBase, /*width = */ 6, "0X__2A"},
+ {42, kHex | kInt | kUpper | kBase | kPos, /*width = */ 0, "0X2A"},
+ {42, kHex | kInt | kUpper | kBase | kPos, /*width = */ 6, "0X__2A"},
+ {42, kHex | kRight, /*width = */ 0, "2a"},
+ {42, kHex | kRight, /*width = */ 6, "____2a"},
+ {42, kHex | kRight | kPos, /*width = */ 0, "2a"},
+ {42, kHex | kRight | kPos, /*width = */ 6, "____2a"},
+ {42, kHex | kRight | kBase, /*width = */ 0, "0x2a"},
+ {42, kHex | kRight | kBase, /*width = */ 6, "__0x2a"},
+ {42, kHex | kRight | kBase | kPos, /*width = */ 0, "0x2a"},
+ {42, kHex | kRight | kBase | kPos, /*width = */ 6, "__0x2a"},
+ {42, kHex | kRight | kUpper, /*width = */ 0, "2A"},
+ {42, kHex | kRight | kUpper, /*width = */ 6, "____2A"},
+ {42, kHex | kRight | kUpper | kPos, /*width = */ 0, "2A"},
+ {42, kHex | kRight | kUpper | kPos, /*width = */ 6, "____2A"},
+ {42, kHex | kRight | kUpper | kBase, /*width = */ 0, "0X2A"},
+ {42, kHex | kRight | kUpper | kBase, /*width = */ 6, "__0X2A"},
+ {42, kHex | kRight | kUpper | kBase | kPos, /*width = */ 0, "0X2A"},
+ {42, kHex | kRight | kUpper | kBase | kPos, /*width = */ 6, "__0X2A"},
+ {-321, std::ios_base::fmtflags(), /*width = */ 0, "-321"},
+ {-321, std::ios_base::fmtflags(), /*width = */ 6, "__-321"},
+ {-321, kPos, /*width = */ 0, "-321"},
+ {-321, kPos, /*width = */ 6, "__-321"},
+ {-321, kBase, /*width = */ 0, "-321"},
+ {-321, kBase, /*width = */ 6, "__-321"},
+ {-321, kBase | kPos, /*width = */ 0, "-321"},
+ {-321, kBase | kPos, /*width = */ 6, "__-321"},
+ {-321, kUpper, /*width = */ 0, "-321"},
+ {-321, kUpper, /*width = */ 6, "__-321"},
+ {-321, kUpper | kPos, /*width = */ 0, "-321"},
+ {-321, kUpper | kPos, /*width = */ 6, "__-321"},
+ {-321, kUpper | kBase, /*width = */ 0, "-321"},
+ {-321, kUpper | kBase, /*width = */ 6, "__-321"},
+ {-321, kUpper | kBase | kPos, /*width = */ 0, "-321"},
+ {-321, kUpper | kBase | kPos, /*width = */ 6, "__-321"},
+ {-321, kLeft, /*width = */ 0, "-321"},
+ {-321, kLeft, /*width = */ 6, "-321__"},
+ {-321, kLeft | kPos, /*width = */ 0, "-321"},
+ {-321, kLeft | kPos, /*width = */ 6, "-321__"},
+ {-321, kLeft | kBase, /*width = */ 0, "-321"},
+ {-321, kLeft | kBase, /*width = */ 6, "-321__"},
+ {-321, kLeft | kBase | kPos, /*width = */ 0, "-321"},
+ {-321, kLeft | kBase | kPos, /*width = */ 6, "-321__"},
+ {-321, kLeft | kUpper, /*width = */ 0, "-321"},
+ {-321, kLeft | kUpper, /*width = */ 6, "-321__"},
+ {-321, kLeft | kUpper | kPos, /*width = */ 0, "-321"},
+ {-321, kLeft | kUpper | kPos, /*width = */ 6, "-321__"},
+ {-321, kLeft | kUpper | kBase, /*width = */ 0, "-321"},
+ {-321, kLeft | kUpper | kBase, /*width = */ 6, "-321__"},
+ {-321, kLeft | kUpper | kBase | kPos, /*width = */ 0, "-321"},
+ {-321, kLeft | kUpper | kBase | kPos, /*width = */ 6, "-321__"},
+ {-321, kInt, /*width = */ 0, "-321"},
+ {-321, kInt, /*width = */ 6, "-__321"},
+ {-321, kInt | kPos, /*width = */ 0, "-321"},
+ {-321, kInt | kPos, /*width = */ 6, "-__321"},
+ {-321, kInt | kBase, /*width = */ 0, "-321"},
+ {-321, kInt | kBase, /*width = */ 6, "-__321"},
+ {-321, kInt | kBase | kPos, /*width = */ 0, "-321"},
+ {-321, kInt | kBase | kPos, /*width = */ 6, "-__321"},
+ {-321, kInt | kUpper, /*width = */ 0, "-321"},
+ {-321, kInt | kUpper, /*width = */ 6, "-__321"},
+ {-321, kInt | kUpper | kPos, /*width = */ 0, "-321"},
+ {-321, kInt | kUpper | kPos, /*width = */ 6, "-__321"},
+ {-321, kInt | kUpper | kBase, /*width = */ 0, "-321"},
+ {-321, kInt | kUpper | kBase, /*width = */ 6, "-__321"},
+ {-321, kInt | kUpper | kBase | kPos, /*width = */ 0, "-321"},
+ {-321, kInt | kUpper | kBase | kPos, /*width = */ 6, "-__321"},
+ {-321, kRight, /*width = */ 0, "-321"},
+ {-321, kRight, /*width = */ 6, "__-321"},
+ {-321, kRight | kPos, /*width = */ 0, "-321"},
+ {-321, kRight | kPos, /*width = */ 6, "__-321"},
+ {-321, kRight | kBase, /*width = */ 0, "-321"},
+ {-321, kRight | kBase, /*width = */ 6, "__-321"},
+ {-321, kRight | kBase | kPos, /*width = */ 0, "-321"},
+ {-321, kRight | kBase | kPos, /*width = */ 6, "__-321"},
+ {-321, kRight | kUpper, /*width = */ 0, "-321"},
+ {-321, kRight | kUpper, /*width = */ 6, "__-321"},
+ {-321, kRight | kUpper | kPos, /*width = */ 0, "-321"},
+ {-321, kRight | kUpper | kPos, /*width = */ 6, "__-321"},
+ {-321, kRight | kUpper | kBase, /*width = */ 0, "-321"},
+ {-321, kRight | kUpper | kBase, /*width = */ 6, "__-321"},
+ {-321, kRight | kUpper | kBase | kPos, /*width = */ 0, "-321"},
+ {-321, kRight | kUpper | kBase | kPos, /*width = */ 6, "__-321"},
+ {-321, kDec, /*width = */ 0, "-321"},
+ {-321, kDec, /*width = */ 6, "__-321"},
+ {-321, kDec | kPos, /*width = */ 0, "-321"},
+ {-321, kDec | kPos, /*width = */ 6, "__-321"},
+ {-321, kDec | kBase, /*width = */ 0, "-321"},
+ {-321, kDec | kBase, /*width = */ 6, "__-321"},
+ {-321, kDec | kBase | kPos, /*width = */ 0, "-321"},
+ {-321, kDec | kBase | kPos, /*width = */ 6, "__-321"},
+ {-321, kDec | kUpper, /*width = */ 0, "-321"},
+ {-321, kDec | kUpper, /*width = */ 6, "__-321"},
+ {-321, kDec | kUpper | kPos, /*width = */ 0, "-321"},
+ {-321, kDec | kUpper | kPos, /*width = */ 6, "__-321"},
+ {-321, kDec | kUpper | kBase, /*width = */ 0, "-321"},
+ {-321, kDec | kUpper | kBase, /*width = */ 6, "__-321"},
+ {-321, kDec | kUpper | kBase | kPos, /*width = */ 0, "-321"},
+ {-321, kDec | kUpper | kBase | kPos, /*width = */ 6, "__-321"},
+ {-321, kDec | kLeft, /*width = */ 0, "-321"},
+ {-321, kDec | kLeft, /*width = */ 6, "-321__"},
+ {-321, kDec | kLeft | kPos, /*width = */ 0, "-321"},
+ {-321, kDec | kLeft | kPos, /*width = */ 6, "-321__"},
+ {-321, kDec | kLeft | kBase, /*width = */ 0, "-321"},
+ {-321, kDec | kLeft | kBase, /*width = */ 6, "-321__"},
+ {-321, kDec | kLeft | kBase | kPos, /*width = */ 0, "-321"},
+ {-321, kDec | kLeft | kBase | kPos, /*width = */ 6, "-321__"},
+ {-321, kDec | kLeft | kUpper, /*width = */ 0, "-321"},
+ {-321, kDec | kLeft | kUpper, /*width = */ 6, "-321__"},
+ {-321, kDec | kLeft | kUpper | kPos, /*width = */ 0, "-321"},
+ {-321, kDec | kLeft | kUpper | kPos, /*width = */ 6, "-321__"},
+ {-321, kDec | kLeft | kUpper | kBase, /*width = */ 0, "-321"},
+ {-321, kDec | kLeft | kUpper | kBase, /*width = */ 6, "-321__"},
+ {-321, kDec | kLeft | kUpper | kBase | kPos, /*width = */ 0, "-321"},
+ {-321, kDec | kLeft | kUpper | kBase | kPos, /*width = */ 6, "-321__"},
+ {-321, kDec | kInt, /*width = */ 0, "-321"},
+ {-321, kDec | kInt, /*width = */ 6, "-__321"},
+ {-321, kDec | kInt | kPos, /*width = */ 0, "-321"},
+ {-321, kDec | kInt | kPos, /*width = */ 6, "-__321"},
+ {-321, kDec | kInt | kBase, /*width = */ 0, "-321"},
+ {-321, kDec | kInt | kBase, /*width = */ 6, "-__321"},
+ {-321, kDec | kInt | kBase | kPos, /*width = */ 0, "-321"},
+ {-321, kDec | kInt | kBase | kPos, /*width = */ 6, "-__321"},
+ {-321, kDec | kInt | kUpper, /*width = */ 0, "-321"},
+ {-321, kDec | kInt | kUpper, /*width = */ 6, "-__321"},
+ {-321, kDec | kInt | kUpper | kPos, /*width = */ 0, "-321"},
+ {-321, kDec | kInt | kUpper | kPos, /*width = */ 6, "-__321"},
+ {-321, kDec | kInt | kUpper | kBase, /*width = */ 0, "-321"},
+ {-321, kDec | kInt | kUpper | kBase, /*width = */ 6, "-__321"},
+ {-321, kDec | kInt | kUpper | kBase | kPos, /*width = */ 0, "-321"},
+ {-321, kDec | kInt | kUpper | kBase | kPos, /*width = */ 6, "-__321"},
+ {-321, kDec | kRight, /*width = */ 0, "-321"},
+ {-321, kDec | kRight, /*width = */ 6, "__-321"},
+ {-321, kDec | kRight | kPos, /*width = */ 0, "-321"},
+ {-321, kDec | kRight | kPos, /*width = */ 6, "__-321"},
+ {-321, kDec | kRight | kBase, /*width = */ 0, "-321"},
+ {-321, kDec | kRight | kBase, /*width = */ 6, "__-321"},
+ {-321, kDec | kRight | kBase | kPos, /*width = */ 0, "-321"},
+ {-321, kDec | kRight | kBase | kPos, /*width = */ 6, "__-321"},
+ {-321, kDec | kRight | kUpper, /*width = */ 0, "-321"},
+ {-321, kDec | kRight | kUpper, /*width = */ 6, "__-321"},
+ {-321, kDec | kRight | kUpper | kPos, /*width = */ 0, "-321"},
+ {-321, kDec | kRight | kUpper | kPos, /*width = */ 6, "__-321"},
+ {-321, kDec | kRight | kUpper | kBase, /*width = */ 0, "-321"},
+ {-321, kDec | kRight | kUpper | kBase, /*width = */ 6, "__-321"},
+ {-321, kDec | kRight | kUpper | kBase | kPos, /*width = */ 0, "-321"},
+ {-321, kDec | kRight | kUpper | kBase | kPos, /*width = */ 6, "__-321"}};
+}
+
+std::vector<Uint128TestCase> GetUint128FormatCases() {
+ return {
+ {0, std::ios_base::fmtflags(), /*width = */ 0, "0"},
+ {0, std::ios_base::fmtflags(), /*width = */ 6, "_____0"},
+ {0, kPos, /*width = */ 0, "0"},
+ {0, kPos, /*width = */ 6, "_____0"},
+ {0, kBase, /*width = */ 0, "0"},
+ {0, kBase, /*width = */ 6, "_____0"},
+ {0, kBase | kPos, /*width = */ 0, "0"},
+ {0, kBase | kPos, /*width = */ 6, "_____0"},
+ {0, kUpper, /*width = */ 0, "0"},
+ {0, kUpper, /*width = */ 6, "_____0"},
+ {0, kUpper | kPos, /*width = */ 0, "0"},
+ {0, kUpper | kPos, /*width = */ 6, "_____0"},
+ {0, kUpper | kBase, /*width = */ 0, "0"},
+ {0, kUpper | kBase, /*width = */ 6, "_____0"},
+ {0, kUpper | kBase | kPos, /*width = */ 0, "0"},
+ {0, kUpper | kBase | kPos, /*width = */ 6, "_____0"},
+ {0, kLeft, /*width = */ 0, "0"},
+ {0, kLeft, /*width = */ 6, "0_____"},
+ {0, kLeft | kPos, /*width = */ 0, "0"},
+ {0, kLeft | kPos, /*width = */ 6, "0_____"},
+ {0, kLeft | kBase, /*width = */ 0, "0"},
+ {0, kLeft | kBase, /*width = */ 6, "0_____"},
+ {0, kLeft | kBase | kPos, /*width = */ 0, "0"},
+ {0, kLeft | kBase | kPos, /*width = */ 6, "0_____"},
+ {0, kLeft | kUpper, /*width = */ 0, "0"},
+ {0, kLeft | kUpper, /*width = */ 6, "0_____"},
+ {0, kLeft | kUpper | kPos, /*width = */ 0, "0"},
+ {0, kLeft | kUpper | kPos, /*width = */ 6, "0_____"},
+ {0, kLeft | kUpper | kBase, /*width = */ 0, "0"},
+ {0, kLeft | kUpper | kBase, /*width = */ 6, "0_____"},
+ {0, kLeft | kUpper | kBase | kPos, /*width = */ 0, "0"},
+ {0, kLeft | kUpper | kBase | kPos, /*width = */ 6, "0_____"},
+ {0, kInt, /*width = */ 0, "0"},
+ {0, kInt, /*width = */ 6, "_____0"},
+ {0, kInt | kPos, /*width = */ 0, "0"},
+ {0, kInt | kPos, /*width = */ 6, "_____0"},
+ {0, kInt | kBase, /*width = */ 0, "0"},
+ {0, kInt | kBase, /*width = */ 6, "_____0"},
+ {0, kInt | kBase | kPos, /*width = */ 0, "0"},
+ {0, kInt | kBase | kPos, /*width = */ 6, "_____0"},
+ {0, kInt | kUpper, /*width = */ 0, "0"},
+ {0, kInt | kUpper, /*width = */ 6, "_____0"},
+ {0, kInt | kUpper | kPos, /*width = */ 0, "0"},
+ {0, kInt | kUpper | kPos, /*width = */ 6, "_____0"},
+ {0, kInt | kUpper | kBase, /*width = */ 0, "0"},
+ {0, kInt | kUpper | kBase, /*width = */ 6, "_____0"},
+ {0, kInt | kUpper | kBase | kPos, /*width = */ 0, "0"},
+ {0, kInt | kUpper | kBase | kPos, /*width = */ 6, "_____0"},
+ {0, kRight, /*width = */ 0, "0"},
+ {0, kRight, /*width = */ 6, "_____0"},
+ {0, kRight | kPos, /*width = */ 0, "0"},
+ {0, kRight | kPos, /*width = */ 6, "_____0"},
+ {0, kRight | kBase, /*width = */ 0, "0"},
+ {0, kRight | kBase, /*width = */ 6, "_____0"},
+ {0, kRight | kBase | kPos, /*width = */ 0, "0"},
+ {0, kRight | kBase | kPos, /*width = */ 6, "_____0"},
+ {0, kRight | kUpper, /*width = */ 0, "0"},
+ {0, kRight | kUpper, /*width = */ 6, "_____0"},
+ {0, kRight | kUpper | kPos, /*width = */ 0, "0"},
+ {0, kRight | kUpper | kPos, /*width = */ 6, "_____0"},
+ {0, kRight | kUpper | kBase, /*width = */ 0, "0"},
+ {0, kRight | kUpper | kBase, /*width = */ 6, "_____0"},
+ {0, kRight | kUpper | kBase | kPos, /*width = */ 0, "0"},
+ {0, kRight | kUpper | kBase | kPos, /*width = */ 6, "_____0"},
+ {0, kDec, /*width = */ 0, "0"},
+ {0, kDec, /*width = */ 6, "_____0"},
+ {0, kDec | kPos, /*width = */ 0, "0"},
+ {0, kDec | kPos, /*width = */ 6, "_____0"},
+ {0, kDec | kBase, /*width = */ 0, "0"},
+ {0, kDec | kBase, /*width = */ 6, "_____0"},
+ {0, kDec | kBase | kPos, /*width = */ 0, "0"},
+ {0, kDec | kBase | kPos, /*width = */ 6, "_____0"},
+ {0, kDec | kUpper, /*width = */ 0, "0"},
+ {0, kDec | kUpper, /*width = */ 6, "_____0"},
+ {0, kDec | kUpper | kPos, /*width = */ 0, "0"},
+ {0, kDec | kUpper | kPos, /*width = */ 6, "_____0"},
+ {0, kDec | kUpper | kBase, /*width = */ 0, "0"},
+ {0, kDec | kUpper | kBase, /*width = */ 6, "_____0"},
+ {0, kDec | kUpper | kBase | kPos, /*width = */ 0, "0"},
+ {0, kDec | kUpper | kBase | kPos, /*width = */ 6, "_____0"},
+ {0, kDec | kLeft, /*width = */ 0, "0"},
+ {0, kDec | kLeft, /*width = */ 6, "0_____"},
+ {0, kDec | kLeft | kPos, /*width = */ 0, "0"},
+ {0, kDec | kLeft | kPos, /*width = */ 6, "0_____"},
+ {0, kDec | kLeft | kBase, /*width = */ 0, "0"},
+ {0, kDec | kLeft | kBase, /*width = */ 6, "0_____"},
+ {0, kDec | kLeft | kBase | kPos, /*width = */ 0, "0"},
+ {0, kDec | kLeft | kBase | kPos, /*width = */ 6, "0_____"},
+ {0, kDec | kLeft | kUpper, /*width = */ 0, "0"},
+ {0, kDec | kLeft | kUpper, /*width = */ 6, "0_____"},
+ {0, kDec | kLeft | kUpper | kPos, /*width = */ 0, "0"},
+ {0, kDec | kLeft | kUpper | kPos, /*width = */ 6, "0_____"},
+ {0, kDec | kLeft | kUpper | kBase, /*width = */ 0, "0"},
+ {0, kDec | kLeft | kUpper | kBase, /*width = */ 6, "0_____"},
+ {0, kDec | kLeft | kUpper | kBase | kPos, /*width = */ 0, "0"},
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+ {37, kOct | kInt | kPos, /*width = */ 0, "45"},
+ {37, kOct | kInt | kPos, /*width = */ 6, "____45"},
+ {37, kOct | kInt | kBase, /*width = */ 0, "045"},
+ {37, kOct | kInt | kBase, /*width = */ 6, "___045"},
+ {37, kOct | kInt | kBase | kPos, /*width = */ 0, "045"},
+ {37, kOct | kInt | kBase | kPos, /*width = */ 6, "___045"},
+ {37, kOct | kInt | kUpper, /*width = */ 0, "45"},
+ {37, kOct | kInt | kUpper, /*width = */ 6, "____45"},
+ {37, kOct | kInt | kUpper | kPos, /*width = */ 0, "45"},
+ {37, kOct | kInt | kUpper | kPos, /*width = */ 6, "____45"},
+ {37, kOct | kInt | kUpper | kBase, /*width = */ 0, "045"},
+ {37, kOct | kInt | kUpper | kBase, /*width = */ 6, "___045"},
+ {37, kOct | kInt | kUpper | kBase | kPos, /*width = */ 0, "045"},
+ {37, kOct | kInt | kUpper | kBase | kPos, /*width = */ 6, "___045"},
+ {37, kOct | kRight, /*width = */ 0, "45"},
+ {37, kOct | kRight, /*width = */ 6, "____45"},
+ {37, kOct | kRight | kPos, /*width = */ 0, "45"},
+ {37, kOct | kRight | kPos, /*width = */ 6, "____45"},
+ {37, kOct | kRight | kBase, /*width = */ 0, "045"},
+ {37, kOct | kRight | kBase, /*width = */ 6, "___045"},
+ {37, kOct | kRight | kBase | kPos, /*width = */ 0, "045"},
+ {37, kOct | kRight | kBase | kPos, /*width = */ 6, "___045"},
+ {37, kOct | kRight | kUpper, /*width = */ 0, "45"},
+ {37, kOct | kRight | kUpper, /*width = */ 6, "____45"},
+ {37, kOct | kRight | kUpper | kPos, /*width = */ 0, "45"},
+ {37, kOct | kRight | kUpper | kPos, /*width = */ 6, "____45"},
+ {37, kOct | kRight | kUpper | kBase, /*width = */ 0, "045"},
+ {37, kOct | kRight | kUpper | kBase, /*width = */ 6, "___045"},
+ {37, kOct | kRight | kUpper | kBase | kPos, /*width = */ 0, "045"},
+ {37, kOct | kRight | kUpper | kBase | kPos, /*width = */ 6, "___045"},
+ {37, kHex, /*width = */ 0, "25"},
+ {37, kHex, /*width = */ 6, "____25"},
+ {37, kHex | kPos, /*width = */ 0, "25"},
+ {37, kHex | kPos, /*width = */ 6, "____25"},
+ {37, kHex | kBase, /*width = */ 0, "0x25"},
+ {37, kHex | kBase, /*width = */ 6, "__0x25"},
+ {37, kHex | kBase | kPos, /*width = */ 0, "0x25"},
+ {37, kHex | kBase | kPos, /*width = */ 6, "__0x25"},
+ {37, kHex | kUpper, /*width = */ 0, "25"},
+ {37, kHex | kUpper, /*width = */ 6, "____25"},
+ {37, kHex | kUpper | kPos, /*width = */ 0, "25"},
+ {37, kHex | kUpper | kPos, /*width = */ 6, "____25"},
+ {37, kHex | kUpper | kBase, /*width = */ 0, "0X25"},
+ {37, kHex | kUpper | kBase, /*width = */ 6, "__0X25"},
+ {37, kHex | kUpper | kBase | kPos, /*width = */ 0, "0X25"},
+ {37, kHex | kUpper | kBase | kPos, /*width = */ 6, "__0X25"},
+ {37, kHex | kLeft, /*width = */ 0, "25"},
+ {37, kHex | kLeft, /*width = */ 6, "25____"},
+ {37, kHex | kLeft | kPos, /*width = */ 0, "25"},
+ {37, kHex | kLeft | kPos, /*width = */ 6, "25____"},
+ {37, kHex | kLeft | kBase, /*width = */ 0, "0x25"},
+ {37, kHex | kLeft | kBase, /*width = */ 6, "0x25__"},
+ {37, kHex | kLeft | kBase | kPos, /*width = */ 0, "0x25"},
+ {37, kHex | kLeft | kBase | kPos, /*width = */ 6, "0x25__"},
+ {37, kHex | kLeft | kUpper, /*width = */ 0, "25"},
+ {37, kHex | kLeft | kUpper, /*width = */ 6, "25____"},
+ {37, kHex | kLeft | kUpper | kPos, /*width = */ 0, "25"},
+ {37, kHex | kLeft | kUpper | kPos, /*width = */ 6, "25____"},
+ {37, kHex | kLeft | kUpper | kBase, /*width = */ 0, "0X25"},
+ {37, kHex | kLeft | kUpper | kBase, /*width = */ 6, "0X25__"},
+ {37, kHex | kLeft | kUpper | kBase | kPos, /*width = */ 0, "0X25"},
+ {37, kHex | kLeft | kUpper | kBase | kPos, /*width = */ 6, "0X25__"},
+ {37, kHex | kInt, /*width = */ 0, "25"},
+ {37, kHex | kInt, /*width = */ 6, "____25"},
+ {37, kHex | kInt | kPos, /*width = */ 0, "25"},
+ {37, kHex | kInt | kPos, /*width = */ 6, "____25"},
+ {37, kHex | kInt | kBase, /*width = */ 0, "0x25"},
+ {37, kHex | kInt | kBase, /*width = */ 6, "0x__25"},
+ {37, kHex | kInt | kBase | kPos, /*width = */ 0, "0x25"},
+ {37, kHex | kInt | kBase | kPos, /*width = */ 6, "0x__25"},
+ {37, kHex | kInt | kUpper, /*width = */ 0, "25"},
+ {37, kHex | kInt | kUpper, /*width = */ 6, "____25"},
+ {37, kHex | kInt | kUpper | kPos, /*width = */ 0, "25"},
+ {37, kHex | kInt | kUpper | kPos, /*width = */ 6, "____25"},
+ {37, kHex | kInt | kUpper | kBase, /*width = */ 0, "0X25"},
+ {37, kHex | kInt | kUpper | kBase, /*width = */ 6, "0X__25"},
+ {37, kHex | kInt | kUpper | kBase | kPos, /*width = */ 0, "0X25"},
+ {37, kHex | kInt | kUpper | kBase | kPos, /*width = */ 6, "0X__25"},
+ {37, kHex | kRight, /*width = */ 0, "25"},
+ {37, kHex | kRight, /*width = */ 6, "____25"},
+ {37, kHex | kRight | kPos, /*width = */ 0, "25"},
+ {37, kHex | kRight | kPos, /*width = */ 6, "____25"},
+ {37, kHex | kRight | kBase, /*width = */ 0, "0x25"},
+ {37, kHex | kRight | kBase, /*width = */ 6, "__0x25"},
+ {37, kHex | kRight | kBase | kPos, /*width = */ 0, "0x25"},
+ {37, kHex | kRight | kBase | kPos, /*width = */ 6, "__0x25"},
+ {37, kHex | kRight | kUpper, /*width = */ 0, "25"},
+ {37, kHex | kRight | kUpper, /*width = */ 6, "____25"},
+ {37, kHex | kRight | kUpper | kPos, /*width = */ 0, "25"},
+ {37, kHex | kRight | kUpper | kPos, /*width = */ 6, "____25"},
+ {37, kHex | kRight | kUpper | kBase, /*width = */ 0, "0X25"},
+ {37, kHex | kRight | kUpper | kBase, /*width = */ 6, "__0X25"},
+ {37, kHex | kRight | kUpper | kBase | kPos, /*width = */ 0, "0X25"},
+ {37, kHex | kRight | kUpper | kBase | kPos, /*width = */ 6, "__0X25"}};
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/numeric/int128_test.cc b/third_party/abseil/src/absl/numeric/int128_test.cc
new file mode 100644
index 0000000..bc86c71
--- /dev/null
+++ b/third_party/abseil/src/absl/numeric/int128_test.cc
@@ -0,0 +1,1225 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/numeric/int128.h"
+
+#include <algorithm>
+#include <limits>
+#include <random>
+#include <type_traits>
+#include <utility>
+#include <vector>
+
+#include "gtest/gtest.h"
+#include "absl/base/internal/cycleclock.h"
+#include "absl/hash/hash_testing.h"
+#include "absl/meta/type_traits.h"
+
+#if defined(_MSC_VER) && _MSC_VER == 1900
+// Disable "unary minus operator applied to unsigned type" warnings in Microsoft
+// Visual C++ 14 (2015).
+#pragma warning(disable:4146)
+#endif
+
+namespace {
+
+template <typename T>
+class Uint128IntegerTraitsTest : public ::testing::Test {};
+typedef ::testing::Types<bool, char, signed char, unsigned char, char16_t,
+ char32_t, wchar_t,
+ short, // NOLINT(runtime/int)
+ unsigned short, // NOLINT(runtime/int)
+ int, unsigned int,
+ long, // NOLINT(runtime/int)
+ unsigned long, // NOLINT(runtime/int)
+ long long, // NOLINT(runtime/int)
+ unsigned long long> // NOLINT(runtime/int)
+ IntegerTypes;
+
+template <typename T>
+class Uint128FloatTraitsTest : public ::testing::Test {};
+typedef ::testing::Types<float, double, long double> FloatingPointTypes;
+
+TYPED_TEST_SUITE(Uint128IntegerTraitsTest, IntegerTypes);
+
+TYPED_TEST(Uint128IntegerTraitsTest, ConstructAssignTest) {
+ static_assert(std::is_constructible<absl::uint128, TypeParam>::value,
+ "absl::uint128 must be constructible from TypeParam");
+ static_assert(std::is_assignable<absl::uint128&, TypeParam>::value,
+ "absl::uint128 must be assignable from TypeParam");
+ static_assert(!std::is_assignable<TypeParam&, absl::uint128>::value,
+ "TypeParam must not be assignable from absl::uint128");
+}
+
+TYPED_TEST_SUITE(Uint128FloatTraitsTest, FloatingPointTypes);
+
+TYPED_TEST(Uint128FloatTraitsTest, ConstructAssignTest) {
+ static_assert(std::is_constructible<absl::uint128, TypeParam>::value,
+ "absl::uint128 must be constructible from TypeParam");
+ static_assert(!std::is_assignable<absl::uint128&, TypeParam>::value,
+ "absl::uint128 must not be assignable from TypeParam");
+ static_assert(!std::is_assignable<TypeParam&, absl::uint128>::value,
+ "TypeParam must not be assignable from absl::uint128");
+}
+
+#ifdef ABSL_HAVE_INTRINSIC_INT128
+// These type traits done separately as TYPED_TEST requires typeinfo, and not
+// all platforms have this for __int128 even though they define the type.
+TEST(Uint128, IntrinsicTypeTraitsTest) {
+ static_assert(std::is_constructible<absl::uint128, __int128>::value,
+ "absl::uint128 must be constructible from __int128");
+ static_assert(std::is_assignable<absl::uint128&, __int128>::value,
+ "absl::uint128 must be assignable from __int128");
+ static_assert(!std::is_assignable<__int128&, absl::uint128>::value,
+ "__int128 must not be assignable from absl::uint128");
+
+ static_assert(std::is_constructible<absl::uint128, unsigned __int128>::value,
+ "absl::uint128 must be constructible from unsigned __int128");
+ static_assert(std::is_assignable<absl::uint128&, unsigned __int128>::value,
+ "absl::uint128 must be assignable from unsigned __int128");
+ static_assert(!std::is_assignable<unsigned __int128&, absl::uint128>::value,
+ "unsigned __int128 must not be assignable from absl::uint128");
+}
+#endif // ABSL_HAVE_INTRINSIC_INT128
+
+TEST(Uint128, TrivialTraitsTest) {
+ static_assert(absl::is_trivially_default_constructible<absl::uint128>::value,
+ "");
+ static_assert(absl::is_trivially_copy_constructible<absl::uint128>::value,
+ "");
+ static_assert(absl::is_trivially_copy_assignable<absl::uint128>::value, "");
+ static_assert(std::is_trivially_destructible<absl::uint128>::value, "");
+}
+
+TEST(Uint128, AllTests) {
+ absl::uint128 zero = 0;
+ absl::uint128 one = 1;
+ absl::uint128 one_2arg = absl::MakeUint128(0, 1);
+ absl::uint128 two = 2;
+ absl::uint128 three = 3;
+ absl::uint128 big = absl::MakeUint128(2000, 2);
+ absl::uint128 big_minus_one = absl::MakeUint128(2000, 1);
+ absl::uint128 bigger = absl::MakeUint128(2001, 1);
+ absl::uint128 biggest = absl::Uint128Max();
+ absl::uint128 high_low = absl::MakeUint128(1, 0);
+ absl::uint128 low_high =
+ absl::MakeUint128(0, std::numeric_limits<uint64_t>::max());
+ EXPECT_LT(one, two);
+ EXPECT_GT(two, one);
+ EXPECT_LT(one, big);
+ EXPECT_LT(one, big);
+ EXPECT_EQ(one, one_2arg);
+ EXPECT_NE(one, two);
+ EXPECT_GT(big, one);
+ EXPECT_GE(big, two);
+ EXPECT_GE(big, big_minus_one);
+ EXPECT_GT(big, big_minus_one);
+ EXPECT_LT(big_minus_one, big);
+ EXPECT_LE(big_minus_one, big);
+ EXPECT_NE(big_minus_one, big);
+ EXPECT_LT(big, biggest);
+ EXPECT_LE(big, biggest);
+ EXPECT_GT(biggest, big);
+ EXPECT_GE(biggest, big);
+ EXPECT_EQ(big, ~~big);
+ EXPECT_EQ(one, one | one);
+ EXPECT_EQ(big, big | big);
+ EXPECT_EQ(one, one | zero);
+ EXPECT_EQ(one, one & one);
+ EXPECT_EQ(big, big & big);
+ EXPECT_EQ(zero, one & zero);
+ EXPECT_EQ(zero, big & ~big);
+ EXPECT_EQ(zero, one ^ one);
+ EXPECT_EQ(zero, big ^ big);
+ EXPECT_EQ(one, one ^ zero);
+
+ // Shift operators.
+ EXPECT_EQ(big, big << 0);
+ EXPECT_EQ(big, big >> 0);
+ EXPECT_GT(big << 1, big);
+ EXPECT_LT(big >> 1, big);
+ EXPECT_EQ(big, (big << 10) >> 10);
+ EXPECT_EQ(big, (big >> 1) << 1);
+ EXPECT_EQ(one, (one << 80) >> 80);
+ EXPECT_EQ(zero, (one >> 80) << 80);
+
+ // Shift assignments.
+ absl::uint128 big_copy = big;
+ EXPECT_EQ(big << 0, big_copy <<= 0);
+ big_copy = big;
+ EXPECT_EQ(big >> 0, big_copy >>= 0);
+ big_copy = big;
+ EXPECT_EQ(big << 1, big_copy <<= 1);
+ big_copy = big;
+ EXPECT_EQ(big >> 1, big_copy >>= 1);
+ big_copy = big;
+ EXPECT_EQ(big << 10, big_copy <<= 10);
+ big_copy = big;
+ EXPECT_EQ(big >> 10, big_copy >>= 10);
+ big_copy = big;
+ EXPECT_EQ(big << 64, big_copy <<= 64);
+ big_copy = big;
+ EXPECT_EQ(big >> 64, big_copy >>= 64);
+ big_copy = big;
+ EXPECT_EQ(big << 73, big_copy <<= 73);
+ big_copy = big;
+ EXPECT_EQ(big >> 73, big_copy >>= 73);
+
+ EXPECT_EQ(absl::Uint128High64(biggest), std::numeric_limits<uint64_t>::max());
+ EXPECT_EQ(absl::Uint128Low64(biggest), std::numeric_limits<uint64_t>::max());
+ EXPECT_EQ(zero + one, one);
+ EXPECT_EQ(one + one, two);
+ EXPECT_EQ(big_minus_one + one, big);
+ EXPECT_EQ(one - one, zero);
+ EXPECT_EQ(one - zero, one);
+ EXPECT_EQ(zero - one, biggest);
+ EXPECT_EQ(big - big, zero);
+ EXPECT_EQ(big - one, big_minus_one);
+ EXPECT_EQ(big + std::numeric_limits<uint64_t>::max(), bigger);
+ EXPECT_EQ(biggest + 1, zero);
+ EXPECT_EQ(zero - 1, biggest);
+ EXPECT_EQ(high_low - one, low_high);
+ EXPECT_EQ(low_high + one, high_low);
+ EXPECT_EQ(absl::Uint128High64((absl::uint128(1) << 64) - 1), 0);
+ EXPECT_EQ(absl::Uint128Low64((absl::uint128(1) << 64) - 1),
+ std::numeric_limits<uint64_t>::max());
+ EXPECT_TRUE(!!one);
+ EXPECT_TRUE(!!high_low);
+ EXPECT_FALSE(!!zero);
+ EXPECT_FALSE(!one);
+ EXPECT_FALSE(!high_low);
+ EXPECT_TRUE(!zero);
+ EXPECT_TRUE(zero == 0); // NOLINT(readability/check)
+ EXPECT_FALSE(zero != 0); // NOLINT(readability/check)
+ EXPECT_FALSE(one == 0); // NOLINT(readability/check)
+ EXPECT_TRUE(one != 0); // NOLINT(readability/check)
+ EXPECT_FALSE(high_low == 0); // NOLINT(readability/check)
+ EXPECT_TRUE(high_low != 0); // NOLINT(readability/check)
+
+ absl::uint128 test = zero;
+ EXPECT_EQ(++test, one);
+ EXPECT_EQ(test, one);
+ EXPECT_EQ(test++, one);
+ EXPECT_EQ(test, two);
+ EXPECT_EQ(test -= 2, zero);
+ EXPECT_EQ(test, zero);
+ EXPECT_EQ(test += 2, two);
+ EXPECT_EQ(test, two);
+ EXPECT_EQ(--test, one);
+ EXPECT_EQ(test, one);
+ EXPECT_EQ(test--, one);
+ EXPECT_EQ(test, zero);
+ EXPECT_EQ(test |= three, three);
+ EXPECT_EQ(test &= one, one);
+ EXPECT_EQ(test ^= three, two);
+ EXPECT_EQ(test >>= 1, one);
+ EXPECT_EQ(test <<= 1, two);
+
+ EXPECT_EQ(big, -(-big));
+ EXPECT_EQ(two, -((-one) - 1));
+ EXPECT_EQ(absl::Uint128Max(), -one);
+ EXPECT_EQ(zero, -zero);
+
+ EXPECT_EQ(absl::Uint128Max(), absl::kuint128max);
+}
+
+TEST(Uint128, ConversionTests) {
+ EXPECT_TRUE(absl::MakeUint128(1, 0));
+
+#ifdef ABSL_HAVE_INTRINSIC_INT128
+ unsigned __int128 intrinsic =
+ (static_cast<unsigned __int128>(0x3a5b76c209de76f6) << 64) +
+ 0x1f25e1d63a2b46c5;
+ absl::uint128 custom =
+ absl::MakeUint128(0x3a5b76c209de76f6, 0x1f25e1d63a2b46c5);
+
+ EXPECT_EQ(custom, absl::uint128(intrinsic));
+ EXPECT_EQ(custom, absl::uint128(static_cast<__int128>(intrinsic)));
+ EXPECT_EQ(intrinsic, static_cast<unsigned __int128>(custom));
+ EXPECT_EQ(intrinsic, static_cast<__int128>(custom));
+#endif // ABSL_HAVE_INTRINSIC_INT128
+
+ // verify that an integer greater than 2**64 that can be stored precisely
+ // inside a double is converted to a absl::uint128 without loss of
+ // information.
+ double precise_double = 0x530e * std::pow(2.0, 64.0) + 0xda74000000000000;
+ absl::uint128 from_precise_double(precise_double);
+ absl::uint128 from_precise_ints =
+ absl::MakeUint128(0x530e, 0xda74000000000000);
+ EXPECT_EQ(from_precise_double, from_precise_ints);
+ EXPECT_DOUBLE_EQ(static_cast<double>(from_precise_ints), precise_double);
+
+ double approx_double = 0xffffeeeeddddcccc * std::pow(2.0, 64.0) +
+ 0xbbbbaaaa99998888;
+ absl::uint128 from_approx_double(approx_double);
+ EXPECT_DOUBLE_EQ(static_cast<double>(from_approx_double), approx_double);
+
+ double round_to_zero = 0.7;
+ double round_to_five = 5.8;
+ double round_to_nine = 9.3;
+ EXPECT_EQ(static_cast<absl::uint128>(round_to_zero), 0);
+ EXPECT_EQ(static_cast<absl::uint128>(round_to_five), 5);
+ EXPECT_EQ(static_cast<absl::uint128>(round_to_nine), 9);
+
+ absl::uint128 highest_precision_in_long_double =
+ ~absl::uint128{} >> (128 - std::numeric_limits<long double>::digits);
+ EXPECT_EQ(highest_precision_in_long_double,
+ static_cast<absl::uint128>(
+ static_cast<long double>(highest_precision_in_long_double)));
+ // Apply a mask just to make sure all the bits are the right place.
+ const absl::uint128 arbitrary_mask =
+ absl::MakeUint128(0xa29f622677ded751, 0xf8ca66add076f468);
+ EXPECT_EQ(highest_precision_in_long_double & arbitrary_mask,
+ static_cast<absl::uint128>(static_cast<long double>(
+ highest_precision_in_long_double & arbitrary_mask)));
+
+ EXPECT_EQ(static_cast<absl::uint128>(-0.1L), 0);
+}
+
+TEST(Uint128, OperatorAssignReturnRef) {
+ absl::uint128 v(1);
+ (v += 4) -= 3;
+ EXPECT_EQ(2, v);
+}
+
+TEST(Uint128, Multiply) {
+ absl::uint128 a, b, c;
+
+ // Zero test.
+ a = 0;
+ b = 0;
+ c = a * b;
+ EXPECT_EQ(0, c);
+
+ // Max carries.
+ a = absl::uint128(0) - 1;
+ b = absl::uint128(0) - 1;
+ c = a * b;
+ EXPECT_EQ(1, c);
+
+ // Self-operation with max carries.
+ c = absl::uint128(0) - 1;
+ c *= c;
+ EXPECT_EQ(1, c);
+
+ // 1-bit x 1-bit.
+ for (int i = 0; i < 64; ++i) {
+ for (int j = 0; j < 64; ++j) {
+ a = absl::uint128(1) << i;
+ b = absl::uint128(1) << j;
+ c = a * b;
+ EXPECT_EQ(absl::uint128(1) << (i + j), c);
+ }
+ }
+
+ // Verified with dc.
+ a = absl::MakeUint128(0xffffeeeeddddcccc, 0xbbbbaaaa99998888);
+ b = absl::MakeUint128(0x7777666655554444, 0x3333222211110000);
+ c = a * b;
+ EXPECT_EQ(absl::MakeUint128(0x530EDA741C71D4C3, 0xBF25975319080000), c);
+ EXPECT_EQ(0, c - b * a);
+ EXPECT_EQ(a*a - b*b, (a+b) * (a-b));
+
+ // Verified with dc.
+ a = absl::MakeUint128(0x0123456789abcdef, 0xfedcba9876543210);
+ b = absl::MakeUint128(0x02468ace13579bdf, 0xfdb97531eca86420);
+ c = a * b;
+ EXPECT_EQ(absl::MakeUint128(0x97a87f4f261ba3f2, 0x342d0bbf48948200), c);
+ EXPECT_EQ(0, c - b * a);
+ EXPECT_EQ(a*a - b*b, (a+b) * (a-b));
+}
+
+TEST(Uint128, AliasTests) {
+ absl::uint128 x1 = absl::MakeUint128(1, 2);
+ absl::uint128 x2 = absl::MakeUint128(2, 4);
+ x1 += x1;
+ EXPECT_EQ(x2, x1);
+
+ absl::uint128 x3 = absl::MakeUint128(1, static_cast<uint64_t>(1) << 63);
+ absl::uint128 x4 = absl::MakeUint128(3, 0);
+ x3 += x3;
+ EXPECT_EQ(x4, x3);
+}
+
+TEST(Uint128, DivideAndMod) {
+ using std::swap;
+
+ // a := q * b + r
+ absl::uint128 a, b, q, r;
+
+ // Zero test.
+ a = 0;
+ b = 123;
+ q = a / b;
+ r = a % b;
+ EXPECT_EQ(0, q);
+ EXPECT_EQ(0, r);
+
+ a = absl::MakeUint128(0x530eda741c71d4c3, 0xbf25975319080000);
+ q = absl::MakeUint128(0x4de2cab081, 0x14c34ab4676e4bab);
+ b = absl::uint128(0x1110001);
+ r = absl::uint128(0x3eb455);
+ ASSERT_EQ(a, q * b + r); // Sanity-check.
+
+ absl::uint128 result_q, result_r;
+ result_q = a / b;
+ result_r = a % b;
+ EXPECT_EQ(q, result_q);
+ EXPECT_EQ(r, result_r);
+
+ // Try the other way around.
+ swap(q, b);
+ result_q = a / b;
+ result_r = a % b;
+ EXPECT_EQ(q, result_q);
+ EXPECT_EQ(r, result_r);
+ // Restore.
+ swap(b, q);
+
+ // Dividend < divisor; result should be q:0 r:<dividend>.
+ swap(a, b);
+ result_q = a / b;
+ result_r = a % b;
+ EXPECT_EQ(0, result_q);
+ EXPECT_EQ(a, result_r);
+ // Try the other way around.
+ swap(a, q);
+ result_q = a / b;
+ result_r = a % b;
+ EXPECT_EQ(0, result_q);
+ EXPECT_EQ(a, result_r);
+ // Restore.
+ swap(q, a);
+ swap(b, a);
+
+ // Try a large remainder.
+ b = a / 2 + 1;
+ absl::uint128 expected_r =
+ absl::MakeUint128(0x29876d3a0e38ea61, 0xdf92cba98c83ffff);
+ // Sanity checks.
+ ASSERT_EQ(a / 2 - 1, expected_r);
+ ASSERT_EQ(a, b + expected_r);
+ result_q = a / b;
+ result_r = a % b;
+ EXPECT_EQ(1, result_q);
+ EXPECT_EQ(expected_r, result_r);
+}
+
+TEST(Uint128, DivideAndModRandomInputs) {
+ const int kNumIters = 1 << 18;
+ std::minstd_rand random(testing::UnitTest::GetInstance()->random_seed());
+ std::uniform_int_distribution<uint64_t> uniform_uint64;
+ for (int i = 0; i < kNumIters; ++i) {
+ const absl::uint128 a =
+ absl::MakeUint128(uniform_uint64(random), uniform_uint64(random));
+ const absl::uint128 b =
+ absl::MakeUint128(uniform_uint64(random), uniform_uint64(random));
+ if (b == 0) {
+ continue; // Avoid a div-by-zero.
+ }
+ const absl::uint128 q = a / b;
+ const absl::uint128 r = a % b;
+ ASSERT_EQ(a, b * q + r);
+ }
+}
+
+TEST(Uint128, ConstexprTest) {
+ constexpr absl::uint128 zero = absl::uint128();
+ constexpr absl::uint128 one = 1;
+ constexpr absl::uint128 minus_two = -2;
+ EXPECT_EQ(zero, absl::uint128(0));
+ EXPECT_EQ(one, absl::uint128(1));
+ EXPECT_EQ(minus_two, absl::MakeUint128(-1, -2));
+}
+
+TEST(Uint128, NumericLimitsTest) {
+ static_assert(std::numeric_limits<absl::uint128>::is_specialized, "");
+ static_assert(!std::numeric_limits<absl::uint128>::is_signed, "");
+ static_assert(std::numeric_limits<absl::uint128>::is_integer, "");
+ EXPECT_EQ(static_cast<int>(128 * std::log10(2)),
+ std::numeric_limits<absl::uint128>::digits10);
+ EXPECT_EQ(0, std::numeric_limits<absl::uint128>::min());
+ EXPECT_EQ(0, std::numeric_limits<absl::uint128>::lowest());
+ EXPECT_EQ(absl::Uint128Max(), std::numeric_limits<absl::uint128>::max());
+}
+
+TEST(Uint128, Hash) {
+ EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly({
+ // Some simple values
+ absl::uint128{0},
+ absl::uint128{1},
+ ~absl::uint128{},
+ // 64 bit limits
+ absl::uint128{std::numeric_limits<int64_t>::max()},
+ absl::uint128{std::numeric_limits<uint64_t>::max()} + 0,
+ absl::uint128{std::numeric_limits<uint64_t>::max()} + 1,
+ absl::uint128{std::numeric_limits<uint64_t>::max()} + 2,
+ // Keeping high same
+ absl::uint128{1} << 62,
+ absl::uint128{1} << 63,
+ // Keeping low same
+ absl::uint128{1} << 64,
+ absl::uint128{1} << 65,
+ // 128 bit limits
+ std::numeric_limits<absl::uint128>::max(),
+ std::numeric_limits<absl::uint128>::max() - 1,
+ std::numeric_limits<absl::uint128>::min() + 1,
+ std::numeric_limits<absl::uint128>::min(),
+ }));
+}
+
+
+TEST(Int128Uint128, ConversionTest) {
+ absl::int128 nonnegative_signed_values[] = {
+ 0,
+ 1,
+ 0xffeeddccbbaa9988,
+ absl::MakeInt128(0x7766554433221100, 0),
+ absl::MakeInt128(0x1234567890abcdef, 0xfedcba0987654321),
+ absl::Int128Max()};
+ for (absl::int128 value : nonnegative_signed_values) {
+ EXPECT_EQ(value, absl::int128(absl::uint128(value)));
+
+ absl::uint128 assigned_value;
+ assigned_value = value;
+ EXPECT_EQ(value, absl::int128(assigned_value));
+ }
+
+ absl::int128 negative_values[] = {
+ -1, -0x1234567890abcdef,
+ absl::MakeInt128(-0x5544332211ffeedd, 0),
+ -absl::MakeInt128(0x76543210fedcba98, 0xabcdef0123456789)};
+ for (absl::int128 value : negative_values) {
+ EXPECT_EQ(absl::uint128(-value), -absl::uint128(value));
+
+ absl::uint128 assigned_value;
+ assigned_value = value;
+ EXPECT_EQ(absl::uint128(-value), -assigned_value);
+ }
+}
+
+template <typename T>
+class Int128IntegerTraitsTest : public ::testing::Test {};
+
+TYPED_TEST_SUITE(Int128IntegerTraitsTest, IntegerTypes);
+
+TYPED_TEST(Int128IntegerTraitsTest, ConstructAssignTest) {
+ static_assert(std::is_constructible<absl::int128, TypeParam>::value,
+ "absl::int128 must be constructible from TypeParam");
+ static_assert(std::is_assignable<absl::int128&, TypeParam>::value,
+ "absl::int128 must be assignable from TypeParam");
+ static_assert(!std::is_assignable<TypeParam&, absl::int128>::value,
+ "TypeParam must not be assignable from absl::int128");
+}
+
+template <typename T>
+class Int128FloatTraitsTest : public ::testing::Test {};
+
+TYPED_TEST_SUITE(Int128FloatTraitsTest, FloatingPointTypes);
+
+TYPED_TEST(Int128FloatTraitsTest, ConstructAssignTest) {
+ static_assert(std::is_constructible<absl::int128, TypeParam>::value,
+ "absl::int128 must be constructible from TypeParam");
+ static_assert(!std::is_assignable<absl::int128&, TypeParam>::value,
+ "absl::int128 must not be assignable from TypeParam");
+ static_assert(!std::is_assignable<TypeParam&, absl::int128>::value,
+ "TypeParam must not be assignable from absl::int128");
+}
+
+#ifdef ABSL_HAVE_INTRINSIC_INT128
+// These type traits done separately as TYPED_TEST requires typeinfo, and not
+// all platforms have this for __int128 even though they define the type.
+TEST(Int128, IntrinsicTypeTraitsTest) {
+ static_assert(std::is_constructible<absl::int128, __int128>::value,
+ "absl::int128 must be constructible from __int128");
+ static_assert(std::is_assignable<absl::int128&, __int128>::value,
+ "absl::int128 must be assignable from __int128");
+ static_assert(!std::is_assignable<__int128&, absl::int128>::value,
+ "__int128 must not be assignable from absl::int128");
+
+ static_assert(std::is_constructible<absl::int128, unsigned __int128>::value,
+ "absl::int128 must be constructible from unsigned __int128");
+ static_assert(!std::is_assignable<absl::int128&, unsigned __int128>::value,
+ "absl::int128 must be assignable from unsigned __int128");
+ static_assert(!std::is_assignable<unsigned __int128&, absl::int128>::value,
+ "unsigned __int128 must not be assignable from absl::int128");
+}
+#endif // ABSL_HAVE_INTRINSIC_INT128
+
+TEST(Int128, TrivialTraitsTest) {
+ static_assert(absl::is_trivially_default_constructible<absl::int128>::value,
+ "");
+ static_assert(absl::is_trivially_copy_constructible<absl::int128>::value, "");
+ static_assert(absl::is_trivially_copy_assignable<absl::int128>::value, "");
+ static_assert(std::is_trivially_destructible<absl::int128>::value, "");
+}
+
+TEST(Int128, BoolConversionTest) {
+ EXPECT_FALSE(absl::int128(0));
+ for (int i = 0; i < 64; ++i) {
+ EXPECT_TRUE(absl::MakeInt128(0, uint64_t{1} << i));
+ }
+ for (int i = 0; i < 63; ++i) {
+ EXPECT_TRUE(absl::MakeInt128(int64_t{1} << i, 0));
+ }
+ EXPECT_TRUE(absl::Int128Min());
+
+ EXPECT_EQ(absl::int128(1), absl::int128(true));
+ EXPECT_EQ(absl::int128(0), absl::int128(false));
+}
+
+template <typename T>
+class Int128IntegerConversionTest : public ::testing::Test {};
+
+TYPED_TEST_SUITE(Int128IntegerConversionTest, IntegerTypes);
+
+TYPED_TEST(Int128IntegerConversionTest, RoundTripTest) {
+ EXPECT_EQ(TypeParam{0}, static_cast<TypeParam>(absl::int128(0)));
+ EXPECT_EQ(std::numeric_limits<TypeParam>::min(),
+ static_cast<TypeParam>(
+ absl::int128(std::numeric_limits<TypeParam>::min())));
+ EXPECT_EQ(std::numeric_limits<TypeParam>::max(),
+ static_cast<TypeParam>(
+ absl::int128(std::numeric_limits<TypeParam>::max())));
+}
+
+template <typename T>
+class Int128FloatConversionTest : public ::testing::Test {};
+
+TYPED_TEST_SUITE(Int128FloatConversionTest, FloatingPointTypes);
+
+TYPED_TEST(Int128FloatConversionTest, ConstructAndCastTest) {
+ // Conversions where the floating point values should be exactly the same.
+ // 0x9f5b is a randomly chosen small value.
+ for (int i = 0; i < 110; ++i) { // 110 = 126 - #bits in 0x9f5b
+ SCOPED_TRACE(::testing::Message() << "i = " << i);
+
+ TypeParam float_value = std::ldexp(static_cast<TypeParam>(0x9f5b), i);
+ absl::int128 int_value = absl::int128(0x9f5b) << i;
+
+ EXPECT_EQ(float_value, static_cast<TypeParam>(int_value));
+ EXPECT_EQ(-float_value, static_cast<TypeParam>(-int_value));
+ EXPECT_EQ(int_value, absl::int128(float_value));
+ EXPECT_EQ(-int_value, absl::int128(-float_value));
+ }
+
+ // Round trip conversions with a small sample of randomly generated uint64_t
+ // values (less than int64_t max so that value * 2^64 fits into int128).
+ uint64_t values[] = {0x6d4492c24fb86199, 0x26ead65e4cb359b5,
+ 0x2c43407433ba3fd1, 0x3b574ec668df6b55,
+ 0x1c750e55a29f4f0f};
+ for (uint64_t value : values) {
+ for (int i = 0; i <= 64; ++i) {
+ SCOPED_TRACE(::testing::Message()
+ << "value = " << value << "; i = " << i);
+
+ TypeParam fvalue = std::ldexp(static_cast<TypeParam>(value), i);
+ EXPECT_DOUBLE_EQ(fvalue, static_cast<TypeParam>(absl::int128(fvalue)));
+ EXPECT_DOUBLE_EQ(-fvalue, static_cast<TypeParam>(-absl::int128(fvalue)));
+ EXPECT_DOUBLE_EQ(-fvalue, static_cast<TypeParam>(absl::int128(-fvalue)));
+ EXPECT_DOUBLE_EQ(fvalue, static_cast<TypeParam>(-absl::int128(-fvalue)));
+ }
+ }
+
+ // Round trip conversions with a small sample of random large positive values.
+ absl::int128 large_values[] = {
+ absl::MakeInt128(0x5b0640d96c7b3d9f, 0xb7a7189e51d18622),
+ absl::MakeInt128(0x34bed042c6f65270, 0x73b236570669a089),
+ absl::MakeInt128(0x43deba9e6da12724, 0xf7f0f83da686797d),
+ absl::MakeInt128(0x71e8d383be4e5589, 0x75c3f96fb00752b6)};
+ for (absl::int128 value : large_values) {
+ // Make value have as many significant bits as can be represented by
+ // the mantissa, also making sure the highest and lowest bit in the range
+ // are set.
+ value >>= (127 - std::numeric_limits<TypeParam>::digits);
+ value |= absl::int128(1) << (std::numeric_limits<TypeParam>::digits - 1);
+ value |= 1;
+ for (int i = 0; i < 127 - std::numeric_limits<TypeParam>::digits; ++i) {
+ absl::int128 int_value = value << i;
+ EXPECT_EQ(int_value,
+ static_cast<absl::int128>(static_cast<TypeParam>(int_value)));
+ EXPECT_EQ(-int_value,
+ static_cast<absl::int128>(static_cast<TypeParam>(-int_value)));
+ }
+ }
+
+ // Small sample of checks that rounding is toward zero
+ EXPECT_EQ(0, absl::int128(TypeParam(0.1)));
+ EXPECT_EQ(17, absl::int128(TypeParam(17.8)));
+ EXPECT_EQ(0, absl::int128(TypeParam(-0.8)));
+ EXPECT_EQ(-53, absl::int128(TypeParam(-53.1)));
+ EXPECT_EQ(0, absl::int128(TypeParam(0.5)));
+ EXPECT_EQ(0, absl::int128(TypeParam(-0.5)));
+ TypeParam just_lt_one = std::nexttoward(TypeParam(1), TypeParam(0));
+ EXPECT_EQ(0, absl::int128(just_lt_one));
+ TypeParam just_gt_minus_one = std::nexttoward(TypeParam(-1), TypeParam(0));
+ EXPECT_EQ(0, absl::int128(just_gt_minus_one));
+
+ // Check limits
+ EXPECT_DOUBLE_EQ(std::ldexp(static_cast<TypeParam>(1), 127),
+ static_cast<TypeParam>(absl::Int128Max()));
+ EXPECT_DOUBLE_EQ(-std::ldexp(static_cast<TypeParam>(1), 127),
+ static_cast<TypeParam>(absl::Int128Min()));
+}
+
+TEST(Int128, FactoryTest) {
+ EXPECT_EQ(absl::int128(-1), absl::MakeInt128(-1, -1));
+ EXPECT_EQ(absl::int128(-31), absl::MakeInt128(-1, -31));
+ EXPECT_EQ(absl::int128(std::numeric_limits<int64_t>::min()),
+ absl::MakeInt128(-1, std::numeric_limits<int64_t>::min()));
+ EXPECT_EQ(absl::int128(0), absl::MakeInt128(0, 0));
+ EXPECT_EQ(absl::int128(1), absl::MakeInt128(0, 1));
+ EXPECT_EQ(absl::int128(std::numeric_limits<int64_t>::max()),
+ absl::MakeInt128(0, std::numeric_limits<int64_t>::max()));
+}
+
+TEST(Int128, HighLowTest) {
+ struct HighLowPair {
+ int64_t high;
+ uint64_t low;
+ };
+ HighLowPair values[]{{0, 0}, {0, 1}, {1, 0}, {123, 456}, {-654, 321}};
+ for (const HighLowPair& pair : values) {
+ absl::int128 value = absl::MakeInt128(pair.high, pair.low);
+ EXPECT_EQ(pair.low, absl::Int128Low64(value));
+ EXPECT_EQ(pair.high, absl::Int128High64(value));
+ }
+}
+
+TEST(Int128, LimitsTest) {
+ EXPECT_EQ(absl::MakeInt128(0x7fffffffffffffff, 0xffffffffffffffff),
+ absl::Int128Max());
+ EXPECT_EQ(absl::Int128Max(), ~absl::Int128Min());
+}
+
+#if defined(ABSL_HAVE_INTRINSIC_INT128)
+TEST(Int128, IntrinsicConversionTest) {
+ __int128 intrinsic =
+ (static_cast<__int128>(0x3a5b76c209de76f6) << 64) + 0x1f25e1d63a2b46c5;
+ absl::int128 custom =
+ absl::MakeInt128(0x3a5b76c209de76f6, 0x1f25e1d63a2b46c5);
+
+ EXPECT_EQ(custom, absl::int128(intrinsic));
+ EXPECT_EQ(intrinsic, static_cast<__int128>(custom));
+}
+#endif // ABSL_HAVE_INTRINSIC_INT128
+
+TEST(Int128, ConstexprTest) {
+ constexpr absl::int128 zero = absl::int128();
+ constexpr absl::int128 one = 1;
+ constexpr absl::int128 minus_two = -2;
+ constexpr absl::int128 min = absl::Int128Min();
+ constexpr absl::int128 max = absl::Int128Max();
+ EXPECT_EQ(zero, absl::int128(0));
+ EXPECT_EQ(one, absl::int128(1));
+ EXPECT_EQ(minus_two, absl::MakeInt128(-1, -2));
+ EXPECT_GT(max, one);
+ EXPECT_LT(min, minus_two);
+}
+
+TEST(Int128, ComparisonTest) {
+ struct TestCase {
+ absl::int128 smaller;
+ absl::int128 larger;
+ };
+ TestCase cases[] = {
+ {absl::int128(0), absl::int128(123)},
+ {absl::MakeInt128(-12, 34), absl::MakeInt128(12, 34)},
+ {absl::MakeInt128(1, 1000), absl::MakeInt128(1000, 1)},
+ {absl::MakeInt128(-1000, 1000), absl::MakeInt128(-1, 1)},
+ };
+ for (const TestCase& pair : cases) {
+ SCOPED_TRACE(::testing::Message() << "pair.smaller = " << pair.smaller
+ << "; pair.larger = " << pair.larger);
+
+ EXPECT_TRUE(pair.smaller == pair.smaller); // NOLINT(readability/check)
+ EXPECT_TRUE(pair.larger == pair.larger); // NOLINT(readability/check)
+ EXPECT_FALSE(pair.smaller == pair.larger); // NOLINT(readability/check)
+
+ EXPECT_TRUE(pair.smaller != pair.larger); // NOLINT(readability/check)
+ EXPECT_FALSE(pair.smaller != pair.smaller); // NOLINT(readability/check)
+ EXPECT_FALSE(pair.larger != pair.larger); // NOLINT(readability/check)
+
+ EXPECT_TRUE(pair.smaller < pair.larger); // NOLINT(readability/check)
+ EXPECT_FALSE(pair.larger < pair.smaller); // NOLINT(readability/check)
+
+ EXPECT_TRUE(pair.larger > pair.smaller); // NOLINT(readability/check)
+ EXPECT_FALSE(pair.smaller > pair.larger); // NOLINT(readability/check)
+
+ EXPECT_TRUE(pair.smaller <= pair.larger); // NOLINT(readability/check)
+ EXPECT_FALSE(pair.larger <= pair.smaller); // NOLINT(readability/check)
+ EXPECT_TRUE(pair.smaller <= pair.smaller); // NOLINT(readability/check)
+ EXPECT_TRUE(pair.larger <= pair.larger); // NOLINT(readability/check)
+
+ EXPECT_TRUE(pair.larger >= pair.smaller); // NOLINT(readability/check)
+ EXPECT_FALSE(pair.smaller >= pair.larger); // NOLINT(readability/check)
+ EXPECT_TRUE(pair.smaller >= pair.smaller); // NOLINT(readability/check)
+ EXPECT_TRUE(pair.larger >= pair.larger); // NOLINT(readability/check)
+ }
+}
+
+TEST(Int128, UnaryNegationTest) {
+ int64_t values64[] = {0, 1, 12345, 0x4000000000000000,
+ std::numeric_limits<int64_t>::max()};
+ for (int64_t value : values64) {
+ SCOPED_TRACE(::testing::Message() << "value = " << value);
+
+ EXPECT_EQ(absl::int128(-value), -absl::int128(value));
+ EXPECT_EQ(absl::int128(value), -absl::int128(-value));
+ EXPECT_EQ(absl::MakeInt128(-value, 0), -absl::MakeInt128(value, 0));
+ EXPECT_EQ(absl::MakeInt128(value, 0), -absl::MakeInt128(-value, 0));
+ }
+}
+
+TEST(Int128, LogicalNotTest) {
+ EXPECT_TRUE(!absl::int128(0));
+ for (int i = 0; i < 64; ++i) {
+ EXPECT_FALSE(!absl::MakeInt128(0, uint64_t{1} << i));
+ }
+ for (int i = 0; i < 63; ++i) {
+ EXPECT_FALSE(!absl::MakeInt128(int64_t{1} << i, 0));
+ }
+}
+
+TEST(Int128, AdditionSubtractionTest) {
+ // 64 bit pairs that will not cause overflow / underflow. These test negative
+ // carry; positive carry must be checked separately.
+ std::pair<int64_t, int64_t> cases[]{
+ {0, 0}, // 0, 0
+ {0, 2945781290834}, // 0, +
+ {1908357619234, 0}, // +, 0
+ {0, -1204895918245}, // 0, -
+ {-2957928523560, 0}, // -, 0
+ {89023982312461, 98346012567134}, // +, +
+ {-63454234568239, -23456235230773}, // -, -
+ {98263457263502, -21428561935925}, // +, -
+ {-88235237438467, 15923659234573}, // -, +
+ };
+ for (const auto& pair : cases) {
+ SCOPED_TRACE(::testing::Message()
+ << "pair = {" << pair.first << ", " << pair.second << '}');
+
+ EXPECT_EQ(absl::int128(pair.first + pair.second),
+ absl::int128(pair.first) + absl::int128(pair.second));
+ EXPECT_EQ(absl::int128(pair.second + pair.first),
+ absl::int128(pair.second) += absl::int128(pair.first));
+
+ EXPECT_EQ(absl::int128(pair.first - pair.second),
+ absl::int128(pair.first) - absl::int128(pair.second));
+ EXPECT_EQ(absl::int128(pair.second - pair.first),
+ absl::int128(pair.second) -= absl::int128(pair.first));
+
+ EXPECT_EQ(
+ absl::MakeInt128(pair.second + pair.first, 0),
+ absl::MakeInt128(pair.second, 0) + absl::MakeInt128(pair.first, 0));
+ EXPECT_EQ(
+ absl::MakeInt128(pair.first + pair.second, 0),
+ absl::MakeInt128(pair.first, 0) += absl::MakeInt128(pair.second, 0));
+
+ EXPECT_EQ(
+ absl::MakeInt128(pair.second - pair.first, 0),
+ absl::MakeInt128(pair.second, 0) - absl::MakeInt128(pair.first, 0));
+ EXPECT_EQ(
+ absl::MakeInt128(pair.first - pair.second, 0),
+ absl::MakeInt128(pair.first, 0) -= absl::MakeInt128(pair.second, 0));
+ }
+
+ // check positive carry
+ EXPECT_EQ(absl::MakeInt128(31, 0),
+ absl::MakeInt128(20, 1) +
+ absl::MakeInt128(10, std::numeric_limits<uint64_t>::max()));
+}
+
+TEST(Int128, IncrementDecrementTest) {
+ absl::int128 value = 0;
+ EXPECT_EQ(0, value++);
+ EXPECT_EQ(1, value);
+ EXPECT_EQ(1, value--);
+ EXPECT_EQ(0, value);
+ EXPECT_EQ(-1, --value);
+ EXPECT_EQ(-1, value);
+ EXPECT_EQ(0, ++value);
+ EXPECT_EQ(0, value);
+}
+
+TEST(Int128, MultiplicationTest) {
+ // 1 bit x 1 bit, and negative combinations
+ for (int i = 0; i < 64; ++i) {
+ for (int j = 0; j < 127 - i; ++j) {
+ SCOPED_TRACE(::testing::Message() << "i = " << i << "; j = " << j);
+ absl::int128 a = absl::int128(1) << i;
+ absl::int128 b = absl::int128(1) << j;
+ absl::int128 c = absl::int128(1) << (i + j);
+
+ EXPECT_EQ(c, a * b);
+ EXPECT_EQ(-c, -a * b);
+ EXPECT_EQ(-c, a * -b);
+ EXPECT_EQ(c, -a * -b);
+
+ EXPECT_EQ(c, absl::int128(a) *= b);
+ EXPECT_EQ(-c, absl::int128(-a) *= b);
+ EXPECT_EQ(-c, absl::int128(a) *= -b);
+ EXPECT_EQ(c, absl::int128(-a) *= -b);
+ }
+ }
+
+ // Pairs of random values that will not overflow signed 64-bit multiplication
+ std::pair<int64_t, int64_t> small_values[] = {
+ {0x5e61, 0xf29f79ca14b4}, // +, +
+ {0x3e033b, -0x612c0ee549}, // +, -
+ {-0x052ce7e8, 0x7c728f0f}, // -, +
+ {-0x3af7054626, -0xfb1e1d}, // -, -
+ };
+ for (const std::pair<int64_t, int64_t>& pair : small_values) {
+ SCOPED_TRACE(::testing::Message()
+ << "pair = {" << pair.first << ", " << pair.second << '}');
+
+ EXPECT_EQ(absl::int128(pair.first * pair.second),
+ absl::int128(pair.first) * absl::int128(pair.second));
+ EXPECT_EQ(absl::int128(pair.first * pair.second),
+ absl::int128(pair.first) *= absl::int128(pair.second));
+
+ EXPECT_EQ(absl::MakeInt128(pair.first * pair.second, 0),
+ absl::MakeInt128(pair.first, 0) * absl::int128(pair.second));
+ EXPECT_EQ(absl::MakeInt128(pair.first * pair.second, 0),
+ absl::MakeInt128(pair.first, 0) *= absl::int128(pair.second));
+ }
+
+ // Pairs of positive random values that will not overflow 64-bit
+ // multiplication and can be left shifted by 32 without overflow
+ std::pair<int64_t, int64_t> small_values2[] = {
+ {0x1bb0a110, 0x31487671},
+ {0x4792784e, 0x28add7d7},
+ {0x7b66553a, 0x11dff8ef},
+ };
+ for (const std::pair<int64_t, int64_t>& pair : small_values2) {
+ SCOPED_TRACE(::testing::Message()
+ << "pair = {" << pair.first << ", " << pair.second << '}');
+
+ absl::int128 a = absl::int128(pair.first << 32);
+ absl::int128 b = absl::int128(pair.second << 32);
+ absl::int128 c = absl::MakeInt128(pair.first * pair.second, 0);
+
+ EXPECT_EQ(c, a * b);
+ EXPECT_EQ(-c, -a * b);
+ EXPECT_EQ(-c, a * -b);
+ EXPECT_EQ(c, -a * -b);
+
+ EXPECT_EQ(c, absl::int128(a) *= b);
+ EXPECT_EQ(-c, absl::int128(-a) *= b);
+ EXPECT_EQ(-c, absl::int128(a) *= -b);
+ EXPECT_EQ(c, absl::int128(-a) *= -b);
+ }
+
+ // check 0, 1, and -1 behavior with large values
+ absl::int128 large_values[] = {
+ {absl::MakeInt128(0xd66f061af02d0408, 0x727d2846cb475b53)},
+ {absl::MakeInt128(0x27b8d5ed6104452d, 0x03f8a33b0ee1df4f)},
+ {-absl::MakeInt128(0x621b6626b9e8d042, 0x27311ac99df00938)},
+ {-absl::MakeInt128(0x34e0656f1e95fb60, 0x4281cfd731257a47)},
+ };
+ for (absl::int128 value : large_values) {
+ EXPECT_EQ(0, 0 * value);
+ EXPECT_EQ(0, value * 0);
+ EXPECT_EQ(0, absl::int128(0) *= value);
+ EXPECT_EQ(0, value *= 0);
+
+ EXPECT_EQ(value, 1 * value);
+ EXPECT_EQ(value, value * 1);
+ EXPECT_EQ(value, absl::int128(1) *= value);
+ EXPECT_EQ(value, value *= 1);
+
+ EXPECT_EQ(-value, -1 * value);
+ EXPECT_EQ(-value, value * -1);
+ EXPECT_EQ(-value, absl::int128(-1) *= value);
+ EXPECT_EQ(-value, value *= -1);
+ }
+
+ // Manually calculated random large value cases
+ EXPECT_EQ(absl::MakeInt128(0xcd0efd3442219bb, 0xde47c05bcd9df6e1),
+ absl::MakeInt128(0x7c6448, 0x3bc4285c47a9d253) * 0x1a6037537b);
+ EXPECT_EQ(-absl::MakeInt128(0x1f8f149850b1e5e6, 0x1e50d6b52d272c3e),
+ -absl::MakeInt128(0x23, 0x2e68a513ca1b8859) * 0xe5a434cd14866e);
+ EXPECT_EQ(-absl::MakeInt128(0x55cae732029d1fce, 0xca6474b6423263e4),
+ 0xa9b98a8ddf66bc * -absl::MakeInt128(0x81, 0x672e58231e2469d7));
+ EXPECT_EQ(absl::MakeInt128(0x19c8b7620b507dc4, 0xfec042b71a5f29a4),
+ -0x3e39341147 * -absl::MakeInt128(0x6a14b2, 0x5ed34cca42327b3c));
+
+ EXPECT_EQ(absl::MakeInt128(0xcd0efd3442219bb, 0xde47c05bcd9df6e1),
+ absl::MakeInt128(0x7c6448, 0x3bc4285c47a9d253) *= 0x1a6037537b);
+ EXPECT_EQ(-absl::MakeInt128(0x1f8f149850b1e5e6, 0x1e50d6b52d272c3e),
+ -absl::MakeInt128(0x23, 0x2e68a513ca1b8859) *= 0xe5a434cd14866e);
+ EXPECT_EQ(-absl::MakeInt128(0x55cae732029d1fce, 0xca6474b6423263e4),
+ absl::int128(0xa9b98a8ddf66bc) *=
+ -absl::MakeInt128(0x81, 0x672e58231e2469d7));
+ EXPECT_EQ(absl::MakeInt128(0x19c8b7620b507dc4, 0xfec042b71a5f29a4),
+ absl::int128(-0x3e39341147) *=
+ -absl::MakeInt128(0x6a14b2, 0x5ed34cca42327b3c));
+}
+
+TEST(Int128, DivisionAndModuloTest) {
+ // Check against 64 bit division and modulo operators with a sample of
+ // randomly generated pairs.
+ std::pair<int64_t, int64_t> small_pairs[] = {
+ {0x15f2a64138, 0x67da05}, {0x5e56d194af43045f, 0xcf1543fb99},
+ {0x15e61ed052036a, -0xc8e6}, {0x88125a341e85, -0xd23fb77683},
+ {-0xc06e20, 0x5a}, {-0x4f100219aea3e85d, 0xdcc56cb4efe993},
+ {-0x168d629105, -0xa7}, {-0x7b44e92f03ab2375, -0x6516},
+ };
+ for (const std::pair<int64_t, int64_t>& pair : small_pairs) {
+ SCOPED_TRACE(::testing::Message()
+ << "pair = {" << pair.first << ", " << pair.second << '}');
+
+ absl::int128 dividend = pair.first;
+ absl::int128 divisor = pair.second;
+ int64_t quotient = pair.first / pair.second;
+ int64_t remainder = pair.first % pair.second;
+
+ EXPECT_EQ(quotient, dividend / divisor);
+ EXPECT_EQ(quotient, absl::int128(dividend) /= divisor);
+ EXPECT_EQ(remainder, dividend % divisor);
+ EXPECT_EQ(remainder, absl::int128(dividend) %= divisor);
+ }
+
+ // Test behavior with 0, 1, and -1 with a sample of randomly generated large
+ // values.
+ absl::int128 values[] = {
+ absl::MakeInt128(0x63d26ee688a962b2, 0x9e1411abda5c1d70),
+ absl::MakeInt128(0x152f385159d6f986, 0xbf8d48ef63da395d),
+ -absl::MakeInt128(0x3098d7567030038c, 0x14e7a8a098dc2164),
+ -absl::MakeInt128(0x49a037aca35c809f, 0xa6a87525480ef330),
+ };
+ for (absl::int128 value : values) {
+ SCOPED_TRACE(::testing::Message() << "value = " << value);
+
+ EXPECT_EQ(0, 0 / value);
+ EXPECT_EQ(0, absl::int128(0) /= value);
+ EXPECT_EQ(0, 0 % value);
+ EXPECT_EQ(0, absl::int128(0) %= value);
+
+ EXPECT_EQ(value, value / 1);
+ EXPECT_EQ(value, absl::int128(value) /= 1);
+ EXPECT_EQ(0, value % 1);
+ EXPECT_EQ(0, absl::int128(value) %= 1);
+
+ EXPECT_EQ(-value, value / -1);
+ EXPECT_EQ(-value, absl::int128(value) /= -1);
+ EXPECT_EQ(0, value % -1);
+ EXPECT_EQ(0, absl::int128(value) %= -1);
+ }
+
+ // Min and max values
+ EXPECT_EQ(0, absl::Int128Max() / absl::Int128Min());
+ EXPECT_EQ(absl::Int128Max(), absl::Int128Max() % absl::Int128Min());
+ EXPECT_EQ(-1, absl::Int128Min() / absl::Int128Max());
+ EXPECT_EQ(-1, absl::Int128Min() % absl::Int128Max());
+
+ // Power of two division and modulo of random large dividends
+ absl::int128 positive_values[] = {
+ absl::MakeInt128(0x21e1a1cc69574620, 0xe7ac447fab2fc869),
+ absl::MakeInt128(0x32c2ff3ab89e66e8, 0x03379a613fd1ce74),
+ absl::MakeInt128(0x6f32ca786184dcaf, 0x046f9c9ecb3a9ce1),
+ absl::MakeInt128(0x1aeb469dd990e0ee, 0xda2740f243cd37eb),
+ };
+ for (absl::int128 value : positive_values) {
+ for (int i = 0; i < 127; ++i) {
+ SCOPED_TRACE(::testing::Message()
+ << "value = " << value << "; i = " << i);
+ absl::int128 power_of_two = absl::int128(1) << i;
+
+ EXPECT_EQ(value >> i, value / power_of_two);
+ EXPECT_EQ(value >> i, absl::int128(value) /= power_of_two);
+ EXPECT_EQ(value & (power_of_two - 1), value % power_of_two);
+ EXPECT_EQ(value & (power_of_two - 1),
+ absl::int128(value) %= power_of_two);
+ }
+ }
+
+ // Manually calculated cases with random large dividends
+ struct DivisionModCase {
+ absl::int128 dividend;
+ absl::int128 divisor;
+ absl::int128 quotient;
+ absl::int128 remainder;
+ };
+ DivisionModCase manual_cases[] = {
+ {absl::MakeInt128(0x6ada48d489007966, 0x3c9c5c98150d5d69),
+ absl::MakeInt128(0x8bc308fb, 0x8cb9cc9a3b803344), 0xc3b87e08,
+ absl::MakeInt128(0x1b7db5e1, 0xd9eca34b7af04b49)},
+ {absl::MakeInt128(0xd6946511b5b, 0x4886c5c96546bf5f),
+ -absl::MakeInt128(0x263b, 0xfd516279efcfe2dc), -0x59cbabf0,
+ absl::MakeInt128(0x622, 0xf462909155651d1f)},
+ {-absl::MakeInt128(0x33db734f9e8d1399, 0x8447ac92482bca4d), 0x37495078240,
+ -absl::MakeInt128(0xf01f1, 0xbc0368bf9a77eae8), -0x21a508f404d},
+ {-absl::MakeInt128(0x13f837b409a07e7d, 0x7fc8e248a7d73560), -0x1b9f,
+ absl::MakeInt128(0xb9157556d724, 0xb14f635714d7563e), -0x1ade},
+ };
+ for (const DivisionModCase test_case : manual_cases) {
+ EXPECT_EQ(test_case.quotient, test_case.dividend / test_case.divisor);
+ EXPECT_EQ(test_case.quotient,
+ absl::int128(test_case.dividend) /= test_case.divisor);
+ EXPECT_EQ(test_case.remainder, test_case.dividend % test_case.divisor);
+ EXPECT_EQ(test_case.remainder,
+ absl::int128(test_case.dividend) %= test_case.divisor);
+ }
+}
+
+TEST(Int128, BitwiseLogicTest) {
+ EXPECT_EQ(absl::int128(-1), ~absl::int128(0));
+
+ absl::int128 values[]{
+ 0, -1, 0xde400bee05c3ff6b, absl::MakeInt128(0x7f32178dd81d634a, 0),
+ absl::MakeInt128(0xaf539057055613a9, 0x7d104d7d946c2e4d)};
+ for (absl::int128 value : values) {
+ EXPECT_EQ(value, ~~value);
+
+ EXPECT_EQ(value, value | value);
+ EXPECT_EQ(value, value & value);
+ EXPECT_EQ(0, value ^ value);
+
+ EXPECT_EQ(value, absl::int128(value) |= value);
+ EXPECT_EQ(value, absl::int128(value) &= value);
+ EXPECT_EQ(0, absl::int128(value) ^= value);
+
+ EXPECT_EQ(value, value | 0);
+ EXPECT_EQ(0, value & 0);
+ EXPECT_EQ(value, value ^ 0);
+
+ EXPECT_EQ(absl::int128(-1), value | absl::int128(-1));
+ EXPECT_EQ(value, value & absl::int128(-1));
+ EXPECT_EQ(~value, value ^ absl::int128(-1));
+ }
+
+ // small sample of randomly generated int64_t's
+ std::pair<int64_t, int64_t> pairs64[]{
+ {0x7f86797f5e991af4, 0x1ee30494fb007c97},
+ {0x0b278282bacf01af, 0x58780e0a57a49e86},
+ {0x059f266ccb93a666, 0x3d5b731bae9286f5},
+ {0x63c0c4820f12108c, 0x58166713c12e1c3a},
+ {0x381488bb2ed2a66e, 0x2220a3eb76a3698c},
+ {0x2a0a0dfb81e06f21, 0x4b60585927f5523c},
+ {0x555b1c3a03698537, 0x25478cd19d8e53cb},
+ {0x4750f6f27d779225, 0x16397553c6ff05fc},
+ };
+ for (const std::pair<int64_t, int64_t>& pair : pairs64) {
+ SCOPED_TRACE(::testing::Message()
+ << "pair = {" << pair.first << ", " << pair.second << '}');
+
+ EXPECT_EQ(absl::MakeInt128(~pair.first, ~pair.second),
+ ~absl::MakeInt128(pair.first, pair.second));
+
+ EXPECT_EQ(absl::int128(pair.first & pair.second),
+ absl::int128(pair.first) & absl::int128(pair.second));
+ EXPECT_EQ(absl::int128(pair.first | pair.second),
+ absl::int128(pair.first) | absl::int128(pair.second));
+ EXPECT_EQ(absl::int128(pair.first ^ pair.second),
+ absl::int128(pair.first) ^ absl::int128(pair.second));
+
+ EXPECT_EQ(absl::int128(pair.first & pair.second),
+ absl::int128(pair.first) &= absl::int128(pair.second));
+ EXPECT_EQ(absl::int128(pair.first | pair.second),
+ absl::int128(pair.first) |= absl::int128(pair.second));
+ EXPECT_EQ(absl::int128(pair.first ^ pair.second),
+ absl::int128(pair.first) ^= absl::int128(pair.second));
+
+ EXPECT_EQ(
+ absl::MakeInt128(pair.first & pair.second, 0),
+ absl::MakeInt128(pair.first, 0) & absl::MakeInt128(pair.second, 0));
+ EXPECT_EQ(
+ absl::MakeInt128(pair.first | pair.second, 0),
+ absl::MakeInt128(pair.first, 0) | absl::MakeInt128(pair.second, 0));
+ EXPECT_EQ(
+ absl::MakeInt128(pair.first ^ pair.second, 0),
+ absl::MakeInt128(pair.first, 0) ^ absl::MakeInt128(pair.second, 0));
+
+ EXPECT_EQ(
+ absl::MakeInt128(pair.first & pair.second, 0),
+ absl::MakeInt128(pair.first, 0) &= absl::MakeInt128(pair.second, 0));
+ EXPECT_EQ(
+ absl::MakeInt128(pair.first | pair.second, 0),
+ absl::MakeInt128(pair.first, 0) |= absl::MakeInt128(pair.second, 0));
+ EXPECT_EQ(
+ absl::MakeInt128(pair.first ^ pair.second, 0),
+ absl::MakeInt128(pair.first, 0) ^= absl::MakeInt128(pair.second, 0));
+ }
+}
+
+TEST(Int128, BitwiseShiftTest) {
+ for (int i = 0; i < 64; ++i) {
+ for (int j = 0; j <= i; ++j) {
+ // Left shift from j-th bit to i-th bit.
+ SCOPED_TRACE(::testing::Message() << "i = " << i << "; j = " << j);
+ EXPECT_EQ(uint64_t{1} << i, absl::int128(uint64_t{1} << j) << (i - j));
+ EXPECT_EQ(uint64_t{1} << i, absl::int128(uint64_t{1} << j) <<= (i - j));
+ }
+ }
+ for (int i = 0; i < 63; ++i) {
+ for (int j = 0; j < 64; ++j) {
+ // Left shift from j-th bit to (i + 64)-th bit.
+ SCOPED_TRACE(::testing::Message() << "i = " << i << "; j = " << j);
+ EXPECT_EQ(absl::MakeInt128(uint64_t{1} << i, 0),
+ absl::int128(uint64_t{1} << j) << (i + 64 - j));
+ EXPECT_EQ(absl::MakeInt128(uint64_t{1} << i, 0),
+ absl::int128(uint64_t{1} << j) <<= (i + 64 - j));
+ }
+ for (int j = 0; j <= i; ++j) {
+ // Left shift from (j + 64)-th bit to (i + 64)-th bit.
+ SCOPED_TRACE(::testing::Message() << "i = " << i << "; j = " << j);
+ EXPECT_EQ(absl::MakeInt128(uint64_t{1} << i, 0),
+ absl::MakeInt128(uint64_t{1} << j, 0) << (i - j));
+ EXPECT_EQ(absl::MakeInt128(uint64_t{1} << i, 0),
+ absl::MakeInt128(uint64_t{1} << j, 0) <<= (i - j));
+ }
+ }
+
+ for (int i = 0; i < 64; ++i) {
+ for (int j = i; j < 64; ++j) {
+ // Right shift from j-th bit to i-th bit.
+ SCOPED_TRACE(::testing::Message() << "i = " << i << "; j = " << j);
+ EXPECT_EQ(uint64_t{1} << i, absl::int128(uint64_t{1} << j) >> (j - i));
+ EXPECT_EQ(uint64_t{1} << i, absl::int128(uint64_t{1} << j) >>= (j - i));
+ }
+ for (int j = 0; j < 63; ++j) {
+ // Right shift from (j + 64)-th bit to i-th bit.
+ SCOPED_TRACE(::testing::Message() << "i = " << i << "; j = " << j);
+ EXPECT_EQ(uint64_t{1} << i,
+ absl::MakeInt128(uint64_t{1} << j, 0) >> (j + 64 - i));
+ EXPECT_EQ(uint64_t{1} << i,
+ absl::MakeInt128(uint64_t{1} << j, 0) >>= (j + 64 - i));
+ }
+ }
+ for (int i = 0; i < 63; ++i) {
+ for (int j = i; j < 63; ++j) {
+ // Right shift from (j + 64)-th bit to (i + 64)-th bit.
+ SCOPED_TRACE(::testing::Message() << "i = " << i << "; j = " << j);
+ EXPECT_EQ(absl::MakeInt128(uint64_t{1} << i, 0),
+ absl::MakeInt128(uint64_t{1} << j, 0) >> (j - i));
+ EXPECT_EQ(absl::MakeInt128(uint64_t{1} << i, 0),
+ absl::MakeInt128(uint64_t{1} << j, 0) >>= (j - i));
+ }
+ }
+}
+
+TEST(Int128, NumericLimitsTest) {
+ static_assert(std::numeric_limits<absl::int128>::is_specialized, "");
+ static_assert(std::numeric_limits<absl::int128>::is_signed, "");
+ static_assert(std::numeric_limits<absl::int128>::is_integer, "");
+ EXPECT_EQ(static_cast<int>(127 * std::log10(2)),
+ std::numeric_limits<absl::int128>::digits10);
+ EXPECT_EQ(absl::Int128Min(), std::numeric_limits<absl::int128>::min());
+ EXPECT_EQ(absl::Int128Min(), std::numeric_limits<absl::int128>::lowest());
+ EXPECT_EQ(absl::Int128Max(), std::numeric_limits<absl::int128>::max());
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/random/BUILD.bazel b/third_party/abseil/src/absl/random/BUILD.bazel
new file mode 100644
index 0000000..81e150e
--- /dev/null
+++ b/third_party/abseil/src/absl/random/BUILD.bazel
@@ -0,0 +1,509 @@
+#
+# Copyright 2019 The Abseil Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+# ABSL random-number generation libraries.
+
+load("@rules_cc//cc:defs.bzl", "cc_binary", "cc_library", "cc_test")
+load(
+ "//absl:copts/configure_copts.bzl",
+ "ABSL_DEFAULT_COPTS",
+ "ABSL_DEFAULT_LINKOPTS",
+ "ABSL_TEST_COPTS",
+)
+
+package(default_visibility = ["//visibility:public"])
+
+licenses(["notice"])
+
+cc_library(
+ name = "random",
+ hdrs = ["random.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":distributions",
+ ":seed_sequences",
+ "//absl/random/internal:nonsecure_base",
+ "//absl/random/internal:pcg_engine",
+ "//absl/random/internal:pool_urbg",
+ "//absl/random/internal:randen_engine",
+ ],
+)
+
+cc_library(
+ name = "distributions",
+ srcs = [
+ "discrete_distribution.cc",
+ "gaussian_distribution.cc",
+ ],
+ hdrs = [
+ "bernoulli_distribution.h",
+ "beta_distribution.h",
+ "discrete_distribution.h",
+ "distributions.h",
+ "exponential_distribution.h",
+ "gaussian_distribution.h",
+ "log_uniform_int_distribution.h",
+ "poisson_distribution.h",
+ "uniform_int_distribution.h",
+ "uniform_real_distribution.h",
+ "zipf_distribution.h",
+ ],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ "//absl/base:base_internal",
+ "//absl/base:config",
+ "//absl/base:core_headers",
+ "//absl/meta:type_traits",
+ "//absl/random/internal:distribution_caller",
+ "//absl/random/internal:fast_uniform_bits",
+ "//absl/random/internal:fastmath",
+ "//absl/random/internal:generate_real",
+ "//absl/random/internal:iostream_state_saver",
+ "//absl/random/internal:traits",
+ "//absl/random/internal:uniform_helper",
+ "//absl/random/internal:wide_multiply",
+ "//absl/strings",
+ ],
+)
+
+cc_library(
+ name = "seed_gen_exception",
+ srcs = ["seed_gen_exception.cc"],
+ hdrs = ["seed_gen_exception.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = ["//absl/base:config"],
+)
+
+cc_library(
+ name = "seed_sequences",
+ srcs = ["seed_sequences.cc"],
+ hdrs = [
+ "seed_sequences.h",
+ ],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":seed_gen_exception",
+ "//absl/container:inlined_vector",
+ "//absl/random/internal:nonsecure_base",
+ "//absl/random/internal:pool_urbg",
+ "//absl/random/internal:salted_seed_seq",
+ "//absl/random/internal:seed_material",
+ "//absl/types:span",
+ ],
+)
+
+cc_library(
+ name = "bit_gen_ref",
+ hdrs = ["bit_gen_ref.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":random",
+ "//absl/base:core_headers",
+ "//absl/base:fast_type_id",
+ "//absl/meta:type_traits",
+ "//absl/random/internal:distribution_caller",
+ "//absl/random/internal:fast_uniform_bits",
+ ],
+)
+
+cc_library(
+ name = "mock_distributions",
+ testonly = 1,
+ hdrs = ["mock_distributions.h"],
+ deps = [
+ ":distributions",
+ ":mocking_bit_gen",
+ "//absl/meta:type_traits",
+ "//absl/random/internal:mock_overload_set",
+ "@com_google_googletest//:gtest",
+ ],
+)
+
+cc_library(
+ name = "mocking_bit_gen",
+ testonly = 1,
+ hdrs = [
+ "mocking_bit_gen.h",
+ ],
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":distributions",
+ ":random",
+ "//absl/base:fast_type_id",
+ "//absl/container:flat_hash_map",
+ "//absl/meta:type_traits",
+ "//absl/random/internal:distribution_caller",
+ "//absl/strings",
+ "//absl/types:span",
+ "//absl/types:variant",
+ "//absl/utility",
+ "@com_google_googletest//:gtest",
+ ],
+)
+
+cc_test(
+ name = "bernoulli_distribution_test",
+ size = "small",
+ timeout = "eternal", # Android can take a very long time
+ srcs = ["bernoulli_distribution_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":distributions",
+ ":random",
+ "//absl/random/internal:pcg_engine",
+ "//absl/random/internal:sequence_urbg",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "beta_distribution_test",
+ size = "small",
+ timeout = "eternal", # Android can take a very long time
+ srcs = ["beta_distribution_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ flaky = 1,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":distributions",
+ ":random",
+ "//absl/base:raw_logging_internal",
+ "//absl/random/internal:distribution_test_util",
+ "//absl/random/internal:pcg_engine",
+ "//absl/random/internal:sequence_urbg",
+ "//absl/strings",
+ "//absl/strings:str_format",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "distributions_test",
+ size = "small",
+ timeout = "moderate",
+ srcs = [
+ "distributions_test.cc",
+ ],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":distributions",
+ ":random",
+ "//absl/random/internal:distribution_test_util",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "generators_test",
+ size = "small",
+ srcs = ["generators_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":distributions",
+ ":random",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "log_uniform_int_distribution_test",
+ size = "medium",
+ srcs = [
+ "log_uniform_int_distribution_test.cc",
+ ],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":distributions",
+ ":random",
+ "//absl/base:raw_logging_internal",
+ "//absl/random/internal:distribution_test_util",
+ "//absl/random/internal:pcg_engine",
+ "//absl/random/internal:sequence_urbg",
+ "//absl/strings",
+ "//absl/strings:str_format",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "discrete_distribution_test",
+ size = "medium",
+ srcs = [
+ "discrete_distribution_test.cc",
+ ],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":distributions",
+ ":random",
+ "//absl/base:raw_logging_internal",
+ "//absl/random/internal:distribution_test_util",
+ "//absl/random/internal:pcg_engine",
+ "//absl/random/internal:sequence_urbg",
+ "//absl/strings",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "poisson_distribution_test",
+ size = "small",
+ timeout = "eternal", # Android can take a very long time
+ srcs = [
+ "poisson_distribution_test.cc",
+ ],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ tags = [
+ # Too Slow.
+ "no_test_android_arm",
+ "no_test_loonix",
+ ],
+ deps = [
+ ":distributions",
+ ":random",
+ "//absl/base:core_headers",
+ "//absl/base:raw_logging_internal",
+ "//absl/container:flat_hash_map",
+ "//absl/random/internal:distribution_test_util",
+ "//absl/random/internal:pcg_engine",
+ "//absl/random/internal:sequence_urbg",
+ "//absl/strings",
+ "//absl/strings:str_format",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "exponential_distribution_test",
+ size = "small",
+ srcs = ["exponential_distribution_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":distributions",
+ ":random",
+ "//absl/base:core_headers",
+ "//absl/base:raw_logging_internal",
+ "//absl/random/internal:distribution_test_util",
+ "//absl/random/internal:pcg_engine",
+ "//absl/random/internal:sequence_urbg",
+ "//absl/strings",
+ "//absl/strings:str_format",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "gaussian_distribution_test",
+ size = "small",
+ timeout = "eternal", # Android can take a very long time
+ srcs = [
+ "gaussian_distribution_test.cc",
+ ],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":distributions",
+ ":random",
+ "//absl/base:core_headers",
+ "//absl/base:raw_logging_internal",
+ "//absl/random/internal:distribution_test_util",
+ "//absl/random/internal:sequence_urbg",
+ "//absl/strings",
+ "//absl/strings:str_format",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "uniform_int_distribution_test",
+ size = "medium",
+ timeout = "long",
+ srcs = [
+ "uniform_int_distribution_test.cc",
+ ],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":distributions",
+ ":random",
+ "//absl/base:raw_logging_internal",
+ "//absl/random/internal:distribution_test_util",
+ "//absl/random/internal:pcg_engine",
+ "//absl/random/internal:sequence_urbg",
+ "//absl/strings",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "uniform_real_distribution_test",
+ size = "medium",
+ srcs = [
+ "uniform_real_distribution_test.cc",
+ ],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ tags = [
+ "no_test_android_arm",
+ "no_test_android_arm64",
+ "no_test_android_x86",
+ ],
+ deps = [
+ ":distributions",
+ ":random",
+ "//absl/base:raw_logging_internal",
+ "//absl/random/internal:distribution_test_util",
+ "//absl/random/internal:pcg_engine",
+ "//absl/random/internal:sequence_urbg",
+ "//absl/strings",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "zipf_distribution_test",
+ size = "medium",
+ srcs = [
+ "zipf_distribution_test.cc",
+ ],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":distributions",
+ ":random",
+ "//absl/base:raw_logging_internal",
+ "//absl/random/internal:distribution_test_util",
+ "//absl/random/internal:pcg_engine",
+ "//absl/random/internal:sequence_urbg",
+ "//absl/strings",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "bit_gen_ref_test",
+ size = "small",
+ srcs = ["bit_gen_ref_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":bit_gen_ref",
+ ":random",
+ "//absl/base:fast_type_id",
+ "//absl/random/internal:sequence_urbg",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "mocking_bit_gen_test",
+ size = "small",
+ srcs = ["mocking_bit_gen_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":bit_gen_ref",
+ ":mock_distributions",
+ ":mocking_bit_gen",
+ ":random",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "mock_distributions_test",
+ size = "small",
+ srcs = ["mock_distributions_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":mock_distributions",
+ ":mocking_bit_gen",
+ ":random",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "examples_test",
+ size = "small",
+ srcs = ["examples_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":random",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "seed_sequences_test",
+ size = "small",
+ srcs = ["seed_sequences_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":random",
+ ":seed_sequences",
+ "//absl/random/internal:nonsecure_base",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+BENCHMARK_TAGS = [
+ "benchmark",
+ "no_test_android_arm",
+ "no_test_android_arm64",
+ "no_test_android_x86",
+ "no_test_darwin_x86_64",
+ "no_test_ios_x86_64",
+ "no_test_loonix",
+ "no_test_msvc_x64",
+ "no_test_wasm",
+]
+
+# Benchmarks for various methods / test utilities
+cc_binary(
+ name = "benchmarks",
+ testonly = 1,
+ srcs = [
+ "benchmarks.cc",
+ ],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ tags = BENCHMARK_TAGS,
+ deps = [
+ ":distributions",
+ ":random",
+ ":seed_sequences",
+ "//absl/base:core_headers",
+ "//absl/meta:type_traits",
+ "//absl/random/internal:fast_uniform_bits",
+ "//absl/random/internal:randen_engine",
+ "@com_github_google_benchmark//:benchmark_main",
+ ],
+)
diff --git a/third_party/abseil/src/absl/random/CMakeLists.txt b/third_party/abseil/src/absl/random/CMakeLists.txt
new file mode 100644
index 0000000..7d7bec8
--- /dev/null
+++ b/third_party/abseil/src/absl/random/CMakeLists.txt
@@ -0,0 +1,1207 @@
+#
+# Copyright 2019 The Abseil Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+absl_cc_library(
+ NAME
+ random_random
+ HDRS
+ "random.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::random_distributions
+ absl::random_internal_nonsecure_base
+ absl::random_internal_pcg_engine
+ absl::random_internal_pool_urbg
+ absl::random_internal_randen_engine
+ absl::random_seed_sequences
+)
+
+absl_cc_library(
+ NAME
+ random_bit_gen_ref
+ HDRS
+ "bit_gen_ref.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::core_headers
+ absl::random_internal_distribution_caller
+ absl::random_internal_fast_uniform_bits
+ absl::type_traits
+)
+
+absl_cc_test(
+ NAME
+ random_bit_gen_ref_test
+ SRCS
+ "bit_gen_ref_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::random_bit_gen_ref
+ absl::random_random
+ absl::random_internal_sequence_urbg
+ absl::fast_type_id
+ gmock
+ gtest_main
+)
+
+# Internal-only target, do not depend on directly.
+absl_cc_library(
+ NAME
+ random_internal_mock_helpers
+ HDRS
+ "internal/mock_helpers.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::fast_type_id
+ absl::optional
+)
+
+# Internal-only target, do not depend on directly.
+absl_cc_library(
+ NAME
+ random_internal_mock_overload_set
+ HDRS
+ "internal/mock_overload_set.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::random_mocking_bit_gen
+ absl::random_internal_mock_helpers
+ TESTONLY
+)
+
+absl_cc_library(
+ NAME
+ random_mocking_bit_gen
+ HDRS
+ "mock_distributions.h"
+ "mocking_bit_gen.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::flat_hash_map
+ absl::raw_logging_internal
+ absl::random_distributions
+ absl::random_internal_distribution_caller
+ absl::random_internal_mock_overload_set
+ absl::random_random
+ absl::strings
+ absl::span
+ absl::type_traits
+ absl::utility
+ absl::variant
+ gmock
+ gtest
+ TESTONLY
+)
+
+absl_cc_test(
+ NAME
+ random_mock_distributions_test
+ SRCS
+ "mock_distributions_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::random_mocking_bit_gen
+ absl::random_random
+ gmock
+ gtest_main
+)
+
+absl_cc_test(
+ NAME
+ random_mocking_bit_gen_test
+ SRCS
+ "mocking_bit_gen_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::random_bit_gen_ref
+ absl::random_mocking_bit_gen
+ absl::random_random
+ gmock
+ gtest_main
+)
+
+absl_cc_library(
+ NAME
+ random_distributions
+ SRCS
+ "discrete_distribution.cc"
+ "gaussian_distribution.cc"
+ HDRS
+ "bernoulli_distribution.h"
+ "beta_distribution.h"
+ "discrete_distribution.h"
+ "distributions.h"
+ "exponential_distribution.h"
+ "gaussian_distribution.h"
+ "log_uniform_int_distribution.h"
+ "poisson_distribution.h"
+ "uniform_int_distribution.h"
+ "uniform_real_distribution.h"
+ "zipf_distribution.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::base_internal
+ absl::config
+ absl::core_headers
+ absl::random_internal_generate_real
+ absl::random_internal_distribution_caller
+ absl::random_internal_fast_uniform_bits
+ absl::random_internal_fastmath
+ absl::random_internal_iostream_state_saver
+ absl::random_internal_traits
+ absl::random_internal_uniform_helper
+ absl::random_internal_wide_multiply
+ absl::strings
+ absl::type_traits
+)
+
+absl_cc_library(
+ NAME
+ random_seed_gen_exception
+ SRCS
+ "seed_gen_exception.cc"
+ HDRS
+ "seed_gen_exception.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::config
+)
+
+absl_cc_library(
+ NAME
+ random_seed_sequences
+ SRCS
+ "seed_sequences.cc"
+ HDRS
+ "seed_sequences.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::inlined_vector
+ absl::random_internal_nonsecure_base
+ absl::random_internal_pool_urbg
+ absl::random_internal_salted_seed_seq
+ absl::random_internal_seed_material
+ absl::random_seed_gen_exception
+ absl::span
+)
+
+absl_cc_test(
+ NAME
+ random_bernoulli_distribution_test
+ SRCS
+ "bernoulli_distribution_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::random_distributions
+ absl::random_random
+ absl::random_internal_sequence_urbg
+ absl::random_internal_pcg_engine
+ gmock
+ gtest_main
+)
+
+absl_cc_test(
+ NAME
+ random_beta_distribution_test
+ SRCS
+ "beta_distribution_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::random_distributions
+ absl::random_random
+ absl::random_internal_distribution_test_util
+ absl::random_internal_sequence_urbg
+ absl::random_internal_pcg_engine
+ absl::raw_logging_internal
+ absl::strings
+ absl::str_format
+ gmock
+ gtest_main
+)
+
+absl_cc_test(
+ NAME
+ random_distributions_test
+ SRCS
+ "distributions_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::random_distributions
+ absl::random_random
+ absl::random_internal_distribution_test_util
+ gmock
+ gtest_main
+)
+
+absl_cc_test(
+ NAME
+ random_generators_test
+ SRCS
+ "generators_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ absl::random_distributions
+ absl::random_random
+ absl::raw_logging_internal
+ gmock
+ gtest_main
+)
+
+absl_cc_test(
+ NAME
+ random_log_uniform_int_distribution_test
+ SRCS
+ "log_uniform_int_distribution_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ absl::random_distributions
+ absl::random_internal_distribution_test_util
+ absl::random_internal_pcg_engine
+ absl::random_internal_sequence_urbg
+ absl::random_random
+ absl::raw_logging_internal
+ absl::strings
+ absl::str_format
+ gmock
+ gtest_main
+)
+
+absl_cc_test(
+ NAME
+ random_discrete_distribution_test
+ SRCS
+ "discrete_distribution_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::random_distributions
+ absl::random_internal_distribution_test_util
+ absl::random_internal_pcg_engine
+ absl::random_internal_sequence_urbg
+ absl::random_random
+ absl::raw_logging_internal
+ absl::strings
+ gmock
+ gtest_main
+)
+
+absl_cc_test(
+ NAME
+ random_poisson_distribution_test
+ SRCS
+ "poisson_distribution_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::random_distributions
+ absl::random_random
+ absl::core_headers
+ absl::flat_hash_map
+ absl::random_internal_distribution_test_util
+ absl::random_internal_pcg_engine
+ absl::random_internal_sequence_urbg
+ absl::raw_logging_internal
+ absl::strings
+ absl::str_format
+ gmock
+ gtest_main
+)
+
+absl_cc_test(
+ NAME
+ random_exponential_distribution_test
+ SRCS
+ "exponential_distribution_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::core_headers
+ absl::random_distributions
+ absl::random_internal_distribution_test_util
+ absl::random_internal_pcg_engine
+ absl::random_internal_sequence_urbg
+ absl::random_random
+ absl::raw_logging_internal
+ absl::strings
+ absl::str_format
+ gmock
+ gtest_main
+)
+
+absl_cc_test(
+ NAME
+ random_gaussian_distribution_test
+ SRCS
+ "gaussian_distribution_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::core_headers
+ absl::random_distributions
+ absl::random_internal_distribution_test_util
+ absl::random_internal_sequence_urbg
+ absl::random_random
+ absl::raw_logging_internal
+ absl::strings
+ absl::str_format
+ gmock
+ gtest_main
+)
+
+absl_cc_test(
+ NAME
+ random_uniform_int_distribution_test
+ SRCS
+ "uniform_int_distribution_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::random_distributions
+ absl::random_internal_distribution_test_util
+ absl::random_internal_pcg_engine
+ absl::random_internal_sequence_urbg
+ absl::random_random
+ absl::raw_logging_internal
+ absl::strings
+ gmock
+ gtest_main
+)
+
+absl_cc_test(
+ NAME
+ random_uniform_real_distribution_test
+ SRCS
+ "uniform_real_distribution_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::random_distributions
+ absl::random_internal_distribution_test_util
+ absl::random_internal_pcg_engine
+ absl::random_internal_sequence_urbg
+ absl::random_random
+ absl::strings
+ gmock
+ gtest_main
+)
+
+absl_cc_test(
+ NAME
+ random_zipf_distribution_test
+ SRCS
+ "zipf_distribution_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::random_distributions
+ absl::random_internal_distribution_test_util
+ absl::random_internal_pcg_engine
+ absl::random_internal_sequence_urbg
+ absl::random_random
+ absl::raw_logging_internal
+ absl::strings
+ gmock
+ gtest_main
+)
+
+absl_cc_test(
+ NAME
+ random_examples_test
+ SRCS
+ "examples_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::random_random
+ gtest_main
+)
+
+absl_cc_test(
+ NAME
+ random_seed_sequences_test
+ SRCS
+ "seed_sequences_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::random_seed_sequences
+ absl::random_internal_nonsecure_base
+ absl::random_random
+ gmock
+ gtest_main
+)
+
+# Internal-only target, do not depend on directly.
+absl_cc_library(
+ NAME
+ random_internal_traits
+ HDRS
+ "internal/traits.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::config
+)
+
+# Internal-only target, do not depend on directly.
+absl_cc_library(
+ NAME
+ random_internal_distribution_caller
+ HDRS
+ "internal/distribution_caller.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::config
+ absl::utility
+ absl::fast_type_id
+)
+
+# Internal-only target, do not depend on directly.
+absl_cc_library(
+ NAME
+ random_internal_fast_uniform_bits
+ HDRS
+ "internal/fast_uniform_bits.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::config
+)
+
+# Internal-only target, do not depend on directly.
+absl_cc_library(
+ NAME
+ random_internal_seed_material
+ SRCS
+ "internal/seed_material.cc"
+ HDRS
+ "internal/seed_material.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ $<$<BOOL:${MINGW}>:"bcrypt">
+ DEPS
+ absl::core_headers
+ absl::optional
+ absl::random_internal_fast_uniform_bits
+ absl::raw_logging_internal
+ absl::span
+ absl::strings
+)
+
+# Internal-only target, do not depend on directly.
+absl_cc_library(
+ NAME
+ random_internal_pool_urbg
+ SRCS
+ "internal/pool_urbg.cc"
+ HDRS
+ "internal/pool_urbg.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::base
+ absl::config
+ absl::core_headers
+ absl::endian
+ absl::random_internal_randen
+ absl::random_internal_seed_material
+ absl::random_internal_traits
+ absl::random_seed_gen_exception
+ absl::raw_logging_internal
+ absl::span
+)
+
+# Internal-only target, do not depend on directly.
+absl_cc_library(
+ NAME
+ random_internal_explicit_seed_seq
+ HDRS
+ "internal/random_internal_explicit_seed_seq.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::config
+ TESTONLY
+)
+
+# Internal-only target, do not depend on directly.
+absl_cc_library(
+ NAME
+ random_internal_sequence_urbg
+ HDRS
+ "internal/sequence_urbg.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::config
+ TESTONLY
+)
+
+# Internal-only target, do not depend on directly.
+absl_cc_library(
+ NAME
+ random_internal_salted_seed_seq
+ HDRS
+ "internal/salted_seed_seq.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::inlined_vector
+ absl::optional
+ absl::span
+ absl::random_internal_seed_material
+ absl::type_traits
+)
+
+# Internal-only target, do not depend on directly.
+absl_cc_library(
+ NAME
+ random_internal_iostream_state_saver
+ HDRS
+ "internal/iostream_state_saver.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::int128
+ absl::type_traits
+)
+
+# Internal-only target, do not depend on directly.
+absl_cc_library(
+ NAME
+ random_internal_generate_real
+ HDRS
+ "internal/generate_real.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::bits
+ absl::random_internal_fastmath
+ absl::random_internal_traits
+ absl::type_traits
+)
+
+# Internal-only target, do not depend on directly.
+absl_cc_library(
+ NAME
+ random_internal_wide_multiply
+ HDRS
+ "internal/wide_multiply.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::bits
+ absl::config
+ absl::int128
+)
+
+# Internal-only target, do not depend on directly.
+absl_cc_library(
+ NAME
+ random_internal_fastmath
+ HDRS
+ "internal/fastmath.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::bits
+)
+
+# Internal-only target, do not depend on directly.
+absl_cc_library(
+ NAME
+ random_internal_nonsecure_base
+ HDRS
+ "internal/nonsecure_base.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::core_headers
+ absl::optional
+ absl::random_internal_pool_urbg
+ absl::random_internal_salted_seed_seq
+ absl::random_internal_seed_material
+ absl::span
+ absl::type_traits
+)
+
+# Internal-only target, do not depend on directly.
+absl_cc_library(
+ NAME
+ random_internal_pcg_engine
+ HDRS
+ "internal/pcg_engine.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::config
+ absl::int128
+ absl::random_internal_fastmath
+ absl::random_internal_iostream_state_saver
+ absl::type_traits
+)
+
+# Internal-only target, do not depend on directly.
+absl_cc_library(
+ NAME
+ random_internal_randen_engine
+ HDRS
+ "internal/randen_engine.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::random_internal_iostream_state_saver
+ absl::random_internal_randen
+ absl::raw_logging_internal
+ absl::type_traits
+)
+
+# Internal-only target, do not depend on directly.
+absl_cc_library(
+ NAME
+ random_internal_platform
+ HDRS
+ "internal/randen_traits.h"
+ "internal/platform.h"
+ SRCS
+ "internal/randen_round_keys.cc"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::config
+)
+
+# Internal-only target, do not depend on directly.
+absl_cc_library(
+ NAME
+ random_internal_randen
+ SRCS
+ "internal/randen.cc"
+ HDRS
+ "internal/randen.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::random_internal_platform
+ absl::random_internal_randen_hwaes
+ absl::random_internal_randen_slow
+)
+
+# Internal-only target, do not depend on directly.
+absl_cc_library(
+ NAME
+ random_internal_randen_slow
+ SRCS
+ "internal/randen_slow.cc"
+ HDRS
+ "internal/randen_slow.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::random_internal_platform
+ absl::config
+)
+
+# Internal-only target, do not depend on directly.
+absl_cc_library(
+ NAME
+ random_internal_randen_hwaes
+ SRCS
+ "internal/randen_detect.cc"
+ HDRS
+ "internal/randen_detect.h"
+ "internal/randen_hwaes.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ ${ABSL_RANDOM_RANDEN_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::random_internal_platform
+ absl::random_internal_randen_hwaes_impl
+ absl::config
+)
+
+# Internal-only target, do not depend on directly.
+absl_cc_library(
+ NAME
+ random_internal_randen_hwaes_impl
+ SRCS
+ "internal/randen_hwaes.cc"
+ "internal/randen_hwaes.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ ${ABSL_RANDOM_RANDEN_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::random_internal_platform
+ absl::config
+)
+
+# Internal-only target, do not depend on directly.
+absl_cc_library(
+ NAME
+ random_internal_distribution_test_util
+ SRCS
+ "internal/chi_square.cc"
+ "internal/distribution_test_util.cc"
+ HDRS
+ "internal/chi_square.h"
+ "internal/distribution_test_util.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::config
+ absl::core_headers
+ absl::raw_logging_internal
+ absl::strings
+ absl::str_format
+ absl::span
+)
+
+# Internal-only target, do not depend on directly.
+absl_cc_test(
+ NAME
+ random_internal_traits_test
+ SRCS
+ "internal/traits_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::random_internal_traits
+ gtest_main
+)
+
+# Internal-only target, do not depend on directly.
+absl_cc_test(
+ NAME
+ random_internal_generate_real_test
+ SRCS
+ "internal/generate_real_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::bits
+ absl::flags
+ absl::random_internal_generate_real
+ gtest_main
+)
+
+# Internal-only target, do not depend on directly.
+absl_cc_test(
+ NAME
+ random_internal_distribution_test_util_test
+ SRCS
+ "internal/distribution_test_util_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::random_internal_distribution_test_util
+ gtest_main
+)
+
+# Internal-only target, do not depend on directly.
+absl_cc_test(
+ NAME
+ random_internal_fastmath_test
+ SRCS
+ "internal/fastmath_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::random_internal_fastmath
+ gtest_main
+)
+
+# Internal-only target, do not depend on directly.
+absl_cc_test(
+ NAME
+ random_internal_explicit_seed_seq_test
+ SRCS
+ "internal/explicit_seed_seq_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::random_internal_explicit_seed_seq
+ absl::random_seed_sequences
+ gmock
+ gtest_main
+)
+
+# Internal-only target, do not depend on directly.
+absl_cc_test(
+ NAME
+ random_internal_salted_seed_seq_test
+ SRCS
+ "internal/salted_seed_seq_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::random_internal_salted_seed_seq
+ gmock
+ gtest_main
+)
+
+# Internal-only target, do not depend on directly.
+absl_cc_test(
+ NAME
+ random_internal_chi_square_test
+ SRCS
+ "internal/chi_square_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::core_headers
+ absl::random_internal_distribution_test_util
+ gtest_main
+)
+
+# Internal-only target, do not depend on directly.
+absl_cc_test(
+ NAME
+ random_internal_fast_uniform_bits_test
+ SRCS
+ "internal/fast_uniform_bits_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::random_internal_fast_uniform_bits
+ gtest_main
+)
+
+# Internal-only target, do not depend on directly.
+absl_cc_test(
+ NAME
+ random_internal_nonsecure_base_test
+ SRCS
+ "internal/nonsecure_base_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::random_internal_nonsecure_base
+ absl::random_random
+ absl::random_distributions
+ absl::random_seed_sequences
+ absl::strings
+ gtest_main
+)
+
+# Internal-only target, do not depend on directly.
+absl_cc_test(
+ NAME
+ random_internal_seed_material_test
+ SRCS
+ "internal/seed_material_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::random_internal_seed_material
+ gmock
+ gtest_main
+)
+
+# Internal-only target, do not depend on directly.
+absl_cc_test(
+ NAME
+ random_internal_pool_urbg_test
+ SRCS
+ "internal/pool_urbg_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::random_internal_pool_urbg
+ absl::span
+ absl::type_traits
+ gtest_main
+)
+
+# Internal-only target, do not depend on directly.
+absl_cc_test(
+ NAME
+ random_internal_pcg_engine_test
+ SRCS
+ "internal/pcg_engine_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::random_internal_explicit_seed_seq
+ absl::random_internal_pcg_engine
+ absl::time
+ gmock
+ gtest_main
+)
+
+# Internal-only target, do not depend on directly.
+absl_cc_test(
+ NAME
+ random_internal_randen_engine_test
+ SRCS
+ "internal/randen_engine_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::random_internal_explicit_seed_seq
+ absl::random_internal_randen_engine
+ absl::raw_logging_internal
+ absl::strings
+ absl::time
+ gmock
+ gtest_main
+)
+
+# Internal-only target, do not depend on directly.
+absl_cc_test(
+ NAME
+ random_internal_randen_test
+ SRCS
+ "internal/randen_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::random_internal_randen
+ absl::type_traits
+ gtest_main
+)
+
+# Internal-only target, do not depend on directly.
+absl_cc_test(
+ NAME
+ random_internal_randen_slow_test
+ SRCS
+ "internal/randen_slow_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::random_internal_randen_slow
+ gtest_main
+)
+
+# Internal-only target, do not depend on directly.
+absl_cc_test(
+ NAME
+ random_internal_randen_hwaes_test
+ SRCS
+ "internal/randen_hwaes_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::random_internal_platform
+ absl::random_internal_randen_hwaes
+ absl::random_internal_randen_hwaes_impl
+ absl::raw_logging_internal
+ absl::str_format
+ gmock
+ gtest
+)
+
+# Internal-only target, do not depend on directly.
+absl_cc_library(
+ NAME
+ random_internal_uniform_helper
+ HDRS
+ "internal/uniform_helper.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::config
+ absl::random_internal_traits
+ absl::type_traits
+)
+
+# Internal-only target, do not depend on directly.
+absl_cc_test(
+ NAME
+ random_internal_uniform_helper_test
+ SRCS
+ "internal/uniform_helper_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::random_internal_uniform_helper
+ gtest_main
+)
+
+# Internal-only target, do not depend on directly.
+absl_cc_test(
+ NAME
+ random_internal_iostream_state_saver_test
+ SRCS
+ "internal/iostream_state_saver_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::random_internal_iostream_state_saver
+ gtest_main
+)
+
+# Internal-only target, do not depend on directly.
+absl_cc_test(
+ NAME
+ random_internal_wide_multiply_test
+ SRCS
+ internal/wide_multiply_test.cc
+ COPTS
+ ${ABSL_TEST_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::random_internal_wide_multiply
+ absl::bits
+ absl::int128
+ gtest_main
+)
diff --git a/third_party/abseil/src/absl/random/benchmarks.cc b/third_party/abseil/src/absl/random/benchmarks.cc
new file mode 100644
index 0000000..87bbb98
--- /dev/null
+++ b/third_party/abseil/src/absl/random/benchmarks.cc
@@ -0,0 +1,383 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Benchmarks for absl random distributions as well as a selection of the
+// C++ standard library random distributions.
+
+#include <algorithm>
+#include <cstddef>
+#include <cstdint>
+#include <initializer_list>
+#include <iterator>
+#include <limits>
+#include <random>
+#include <type_traits>
+#include <vector>
+
+#include "absl/base/macros.h"
+#include "absl/meta/type_traits.h"
+#include "absl/random/bernoulli_distribution.h"
+#include "absl/random/beta_distribution.h"
+#include "absl/random/exponential_distribution.h"
+#include "absl/random/gaussian_distribution.h"
+#include "absl/random/internal/fast_uniform_bits.h"
+#include "absl/random/internal/randen_engine.h"
+#include "absl/random/log_uniform_int_distribution.h"
+#include "absl/random/poisson_distribution.h"
+#include "absl/random/random.h"
+#include "absl/random/uniform_int_distribution.h"
+#include "absl/random/uniform_real_distribution.h"
+#include "absl/random/zipf_distribution.h"
+#include "benchmark/benchmark.h"
+
+namespace {
+
+// Seed data to avoid reading random_device() for benchmarks.
+uint32_t kSeedData[] = {
+ 0x1B510052, 0x9A532915, 0xD60F573F, 0xBC9BC6E4, 0x2B60A476, 0x81E67400,
+ 0x08BA6FB5, 0x571BE91F, 0xF296EC6B, 0x2A0DD915, 0xB6636521, 0xE7B9F9B6,
+ 0xFF34052E, 0xC5855664, 0x53B02D5D, 0xA99F8FA1, 0x08BA4799, 0x6E85076A,
+ 0x4B7A70E9, 0xB5B32944, 0xDB75092E, 0xC4192623, 0xAD6EA6B0, 0x49A7DF7D,
+ 0x9CEE60B8, 0x8FEDB266, 0xECAA8C71, 0x699A18FF, 0x5664526C, 0xC2B19EE1,
+ 0x193602A5, 0x75094C29, 0xA0591340, 0xE4183A3E, 0x3F54989A, 0x5B429D65,
+ 0x6B8FE4D6, 0x99F73FD6, 0xA1D29C07, 0xEFE830F5, 0x4D2D38E6, 0xF0255DC1,
+ 0x4CDD2086, 0x8470EB26, 0x6382E9C6, 0x021ECC5E, 0x09686B3F, 0x3EBAEFC9,
+ 0x3C971814, 0x6B6A70A1, 0x687F3584, 0x52A0E286, 0x13198A2E, 0x03707344,
+};
+
+// PrecompiledSeedSeq provides kSeedData to a conforming
+// random engine to speed initialization in the benchmarks.
+class PrecompiledSeedSeq {
+ public:
+ using result_type = uint32_t;
+
+ PrecompiledSeedSeq() {}
+
+ template <typename Iterator>
+ PrecompiledSeedSeq(Iterator begin, Iterator end) {}
+
+ template <typename T>
+ PrecompiledSeedSeq(std::initializer_list<T> il) {}
+
+ template <typename OutIterator>
+ void generate(OutIterator begin, OutIterator end) {
+ static size_t idx = 0;
+ for (; begin != end; begin++) {
+ *begin = kSeedData[idx++];
+ if (idx >= ABSL_ARRAYSIZE(kSeedData)) {
+ idx = 0;
+ }
+ }
+ }
+
+ size_t size() const { return ABSL_ARRAYSIZE(kSeedData); }
+
+ template <typename OutIterator>
+ void param(OutIterator out) const {
+ std::copy(std::begin(kSeedData), std::end(kSeedData), out);
+ }
+};
+
+// use_default_initialization<T> indicates whether the random engine
+// T must be default initialized, or whether we may initialize it using
+// a seed sequence. This is used because some engines do not accept seed
+// sequence-based initialization.
+template <typename E>
+using use_default_initialization = std::false_type;
+
+// make_engine<T, SSeq> returns a random_engine which is initialized,
+// either via the default constructor, when use_default_initialization<T>
+// is true, or via the indicated seed sequence, SSeq.
+template <typename Engine, typename SSeq = PrecompiledSeedSeq>
+typename absl::enable_if_t<!use_default_initialization<Engine>::value, Engine>
+make_engine() {
+ // Initialize the random engine using the seed sequence SSeq, which
+ // is constructed from the precompiled seed data.
+ SSeq seq(std::begin(kSeedData), std::end(kSeedData));
+ return Engine(seq);
+}
+
+template <typename Engine, typename SSeq = PrecompiledSeedSeq>
+typename absl::enable_if_t<use_default_initialization<Engine>::value, Engine>
+make_engine() {
+ // Initialize the random engine using the default constructor.
+ return Engine();
+}
+
+template <typename Engine, typename SSeq>
+void BM_Construct(benchmark::State& state) {
+ for (auto _ : state) {
+ auto rng = make_engine<Engine, SSeq>();
+ benchmark::DoNotOptimize(rng());
+ }
+}
+
+template <typename Engine>
+void BM_Direct(benchmark::State& state) {
+ using value_type = typename Engine::result_type;
+ // Direct use of the URBG.
+ auto rng = make_engine<Engine>();
+ for (auto _ : state) {
+ benchmark::DoNotOptimize(rng());
+ }
+ state.SetBytesProcessed(sizeof(value_type) * state.iterations());
+}
+
+template <typename Engine>
+void BM_Generate(benchmark::State& state) {
+ // std::generate makes a copy of the RNG; thus this tests the
+ // copy-constructor efficiency.
+ using value_type = typename Engine::result_type;
+ std::vector<value_type> v(64);
+ auto rng = make_engine<Engine>();
+ while (state.KeepRunningBatch(64)) {
+ std::generate(std::begin(v), std::end(v), rng);
+ }
+}
+
+template <typename Engine, size_t elems>
+void BM_Shuffle(benchmark::State& state) {
+ // Direct use of the Engine.
+ std::vector<uint32_t> v(elems);
+ while (state.KeepRunningBatch(elems)) {
+ auto rng = make_engine<Engine>();
+ std::shuffle(std::begin(v), std::end(v), rng);
+ }
+}
+
+template <typename Engine, size_t elems>
+void BM_ShuffleReuse(benchmark::State& state) {
+ // Direct use of the Engine.
+ std::vector<uint32_t> v(elems);
+ auto rng = make_engine<Engine>();
+ while (state.KeepRunningBatch(elems)) {
+ std::shuffle(std::begin(v), std::end(v), rng);
+ }
+}
+
+template <typename Engine, typename Dist, typename... Args>
+void BM_Dist(benchmark::State& state, Args&&... args) {
+ using value_type = typename Dist::result_type;
+ auto rng = make_engine<Engine>();
+ Dist dis{std::forward<Args>(args)...};
+ // Compare the following loop performance:
+ for (auto _ : state) {
+ benchmark::DoNotOptimize(dis(rng));
+ }
+ state.SetBytesProcessed(sizeof(value_type) * state.iterations());
+}
+
+template <typename Engine, typename Dist>
+void BM_Large(benchmark::State& state) {
+ using value_type = typename Dist::result_type;
+ volatile value_type kMin = 0;
+ volatile value_type kMax = std::numeric_limits<value_type>::max() / 2 + 1;
+ BM_Dist<Engine, Dist>(state, kMin, kMax);
+}
+
+template <typename Engine, typename Dist>
+void BM_Small(benchmark::State& state) {
+ using value_type = typename Dist::result_type;
+ volatile value_type kMin = 0;
+ volatile value_type kMax = std::numeric_limits<value_type>::max() / 64 + 1;
+ BM_Dist<Engine, Dist>(state, kMin, kMax);
+}
+
+template <typename Engine, typename Dist, int A>
+void BM_Bernoulli(benchmark::State& state) {
+ volatile double a = static_cast<double>(A) / 1000000;
+ BM_Dist<Engine, Dist>(state, a);
+}
+
+template <typename Engine, typename Dist, int A, int B>
+void BM_Beta(benchmark::State& state) {
+ using value_type = typename Dist::result_type;
+ volatile value_type a = static_cast<value_type>(A) / 100;
+ volatile value_type b = static_cast<value_type>(B) / 100;
+ BM_Dist<Engine, Dist>(state, a, b);
+}
+
+template <typename Engine, typename Dist, int A>
+void BM_Gamma(benchmark::State& state) {
+ using value_type = typename Dist::result_type;
+ volatile value_type a = static_cast<value_type>(A) / 100;
+ BM_Dist<Engine, Dist>(state, a);
+}
+
+template <typename Engine, typename Dist, int A = 100>
+void BM_Poisson(benchmark::State& state) {
+ volatile double a = static_cast<double>(A) / 100;
+ BM_Dist<Engine, Dist>(state, a);
+}
+
+template <typename Engine, typename Dist, int Q = 2, int V = 1>
+void BM_Zipf(benchmark::State& state) {
+ using value_type = typename Dist::result_type;
+ volatile double q = Q;
+ volatile double v = V;
+ BM_Dist<Engine, Dist>(state, std::numeric_limits<value_type>::max(), q, v);
+}
+
+template <typename Engine, typename Dist>
+void BM_Thread(benchmark::State& state) {
+ using value_type = typename Dist::result_type;
+ auto rng = make_engine<Engine>();
+ Dist dis{};
+ for (auto _ : state) {
+ benchmark::DoNotOptimize(dis(rng));
+ }
+ state.SetBytesProcessed(sizeof(value_type) * state.iterations());
+}
+
+// NOTES:
+//
+// std::geometric_distribution is similar to the zipf distributions.
+// The algorithm for the geometric_distribution is, basically,
+// floor(log(1-X) / log(1-p))
+
+// Normal benchmark suite
+#define BM_BASIC(Engine) \
+ BENCHMARK_TEMPLATE(BM_Construct, Engine, PrecompiledSeedSeq); \
+ BENCHMARK_TEMPLATE(BM_Construct, Engine, std::seed_seq); \
+ BENCHMARK_TEMPLATE(BM_Direct, Engine); \
+ BENCHMARK_TEMPLATE(BM_Shuffle, Engine, 10); \
+ BENCHMARK_TEMPLATE(BM_Shuffle, Engine, 100); \
+ BENCHMARK_TEMPLATE(BM_Shuffle, Engine, 1000); \
+ BENCHMARK_TEMPLATE(BM_ShuffleReuse, Engine, 100); \
+ BENCHMARK_TEMPLATE(BM_ShuffleReuse, Engine, 1000); \
+ BENCHMARK_TEMPLATE(BM_Dist, Engine, \
+ absl::random_internal::FastUniformBits<uint32_t>); \
+ BENCHMARK_TEMPLATE(BM_Dist, Engine, \
+ absl::random_internal::FastUniformBits<uint64_t>); \
+ BENCHMARK_TEMPLATE(BM_Dist, Engine, std::uniform_int_distribution<int32_t>); \
+ BENCHMARK_TEMPLATE(BM_Dist, Engine, std::uniform_int_distribution<int64_t>); \
+ BENCHMARK_TEMPLATE(BM_Dist, Engine, \
+ absl::uniform_int_distribution<int32_t>); \
+ BENCHMARK_TEMPLATE(BM_Dist, Engine, \
+ absl::uniform_int_distribution<int64_t>); \
+ BENCHMARK_TEMPLATE(BM_Large, Engine, \
+ std::uniform_int_distribution<int32_t>); \
+ BENCHMARK_TEMPLATE(BM_Large, Engine, \
+ std::uniform_int_distribution<int64_t>); \
+ BENCHMARK_TEMPLATE(BM_Large, Engine, \
+ absl::uniform_int_distribution<int32_t>); \
+ BENCHMARK_TEMPLATE(BM_Large, Engine, \
+ absl::uniform_int_distribution<int64_t>); \
+ BENCHMARK_TEMPLATE(BM_Dist, Engine, std::uniform_real_distribution<float>); \
+ BENCHMARK_TEMPLATE(BM_Dist, Engine, std::uniform_real_distribution<double>); \
+ BENCHMARK_TEMPLATE(BM_Dist, Engine, absl::uniform_real_distribution<float>); \
+ BENCHMARK_TEMPLATE(BM_Dist, Engine, absl::uniform_real_distribution<double>)
+
+#define BM_COPY(Engine) BENCHMARK_TEMPLATE(BM_Generate, Engine)
+
+#define BM_THREAD(Engine) \
+ BENCHMARK_TEMPLATE(BM_Thread, Engine, \
+ absl::uniform_int_distribution<int64_t>) \
+ ->ThreadPerCpu(); \
+ BENCHMARK_TEMPLATE(BM_Thread, Engine, \
+ absl::uniform_real_distribution<double>) \
+ ->ThreadPerCpu(); \
+ BENCHMARK_TEMPLATE(BM_Shuffle, Engine, 100)->ThreadPerCpu(); \
+ BENCHMARK_TEMPLATE(BM_Shuffle, Engine, 1000)->ThreadPerCpu(); \
+ BENCHMARK_TEMPLATE(BM_ShuffleReuse, Engine, 100)->ThreadPerCpu(); \
+ BENCHMARK_TEMPLATE(BM_ShuffleReuse, Engine, 1000)->ThreadPerCpu();
+
+#define BM_EXTENDED(Engine) \
+ /* -------------- Extended Uniform -----------------------*/ \
+ BENCHMARK_TEMPLATE(BM_Small, Engine, \
+ std::uniform_int_distribution<int32_t>); \
+ BENCHMARK_TEMPLATE(BM_Small, Engine, \
+ std::uniform_int_distribution<int64_t>); \
+ BENCHMARK_TEMPLATE(BM_Small, Engine, \
+ absl::uniform_int_distribution<int32_t>); \
+ BENCHMARK_TEMPLATE(BM_Small, Engine, \
+ absl::uniform_int_distribution<int64_t>); \
+ BENCHMARK_TEMPLATE(BM_Small, Engine, std::uniform_real_distribution<float>); \
+ BENCHMARK_TEMPLATE(BM_Small, Engine, \
+ std::uniform_real_distribution<double>); \
+ BENCHMARK_TEMPLATE(BM_Small, Engine, \
+ absl::uniform_real_distribution<float>); \
+ BENCHMARK_TEMPLATE(BM_Small, Engine, \
+ absl::uniform_real_distribution<double>); \
+ /* -------------- Other -----------------------*/ \
+ BENCHMARK_TEMPLATE(BM_Dist, Engine, std::normal_distribution<double>); \
+ BENCHMARK_TEMPLATE(BM_Dist, Engine, absl::gaussian_distribution<double>); \
+ BENCHMARK_TEMPLATE(BM_Dist, Engine, std::exponential_distribution<double>); \
+ BENCHMARK_TEMPLATE(BM_Dist, Engine, absl::exponential_distribution<double>); \
+ BENCHMARK_TEMPLATE(BM_Poisson, Engine, std::poisson_distribution<int64_t>, \
+ 100); \
+ BENCHMARK_TEMPLATE(BM_Poisson, Engine, absl::poisson_distribution<int64_t>, \
+ 100); \
+ BENCHMARK_TEMPLATE(BM_Poisson, Engine, std::poisson_distribution<int64_t>, \
+ 10 * 100); \
+ BENCHMARK_TEMPLATE(BM_Poisson, Engine, absl::poisson_distribution<int64_t>, \
+ 10 * 100); \
+ BENCHMARK_TEMPLATE(BM_Poisson, Engine, std::poisson_distribution<int64_t>, \
+ 13 * 100); \
+ BENCHMARK_TEMPLATE(BM_Poisson, Engine, absl::poisson_distribution<int64_t>, \
+ 13 * 100); \
+ BENCHMARK_TEMPLATE(BM_Dist, Engine, \
+ absl::log_uniform_int_distribution<int32_t>); \
+ BENCHMARK_TEMPLATE(BM_Dist, Engine, \
+ absl::log_uniform_int_distribution<int64_t>); \
+ BENCHMARK_TEMPLATE(BM_Dist, Engine, std::geometric_distribution<int64_t>); \
+ BENCHMARK_TEMPLATE(BM_Zipf, Engine, absl::zipf_distribution<uint64_t>); \
+ BENCHMARK_TEMPLATE(BM_Zipf, Engine, absl::zipf_distribution<uint64_t>, 2, \
+ 3); \
+ BENCHMARK_TEMPLATE(BM_Bernoulli, Engine, std::bernoulli_distribution, \
+ 257305); \
+ BENCHMARK_TEMPLATE(BM_Bernoulli, Engine, absl::bernoulli_distribution, \
+ 257305); \
+ BENCHMARK_TEMPLATE(BM_Beta, Engine, absl::beta_distribution<double>, 65, \
+ 41); \
+ BENCHMARK_TEMPLATE(BM_Beta, Engine, absl::beta_distribution<double>, 99, \
+ 330); \
+ BENCHMARK_TEMPLATE(BM_Beta, Engine, absl::beta_distribution<double>, 150, \
+ 150); \
+ BENCHMARK_TEMPLATE(BM_Beta, Engine, absl::beta_distribution<double>, 410, \
+ 580); \
+ BENCHMARK_TEMPLATE(BM_Beta, Engine, absl::beta_distribution<float>, 65, 41); \
+ BENCHMARK_TEMPLATE(BM_Beta, Engine, absl::beta_distribution<float>, 99, \
+ 330); \
+ BENCHMARK_TEMPLATE(BM_Beta, Engine, absl::beta_distribution<float>, 150, \
+ 150); \
+ BENCHMARK_TEMPLATE(BM_Beta, Engine, absl::beta_distribution<float>, 410, \
+ 580); \
+ BENCHMARK_TEMPLATE(BM_Gamma, Engine, std::gamma_distribution<float>, 199); \
+ BENCHMARK_TEMPLATE(BM_Gamma, Engine, std::gamma_distribution<double>, 199);
+
+// ABSL Recommended interfaces.
+BM_BASIC(absl::InsecureBitGen); // === pcg64_2018_engine
+BM_BASIC(absl::BitGen); // === randen_engine<uint64_t>.
+BM_THREAD(absl::BitGen);
+BM_EXTENDED(absl::BitGen);
+
+// Instantiate benchmarks for multiple engines.
+using randen_engine_64 = absl::random_internal::randen_engine<uint64_t>;
+using randen_engine_32 = absl::random_internal::randen_engine<uint32_t>;
+
+// Comparison interfaces.
+BM_BASIC(std::mt19937_64);
+BM_COPY(std::mt19937_64);
+BM_EXTENDED(std::mt19937_64);
+BM_BASIC(randen_engine_64);
+BM_COPY(randen_engine_64);
+BM_EXTENDED(randen_engine_64);
+
+BM_BASIC(std::mt19937);
+BM_COPY(std::mt19937);
+BM_BASIC(randen_engine_32);
+BM_COPY(randen_engine_32);
+
+} // namespace
diff --git a/third_party/abseil/src/absl/random/bernoulli_distribution.h b/third_party/abseil/src/absl/random/bernoulli_distribution.h
new file mode 100644
index 0000000..25bd0d5
--- /dev/null
+++ b/third_party/abseil/src/absl/random/bernoulli_distribution.h
@@ -0,0 +1,200 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_RANDOM_BERNOULLI_DISTRIBUTION_H_
+#define ABSL_RANDOM_BERNOULLI_DISTRIBUTION_H_
+
+#include <cstdint>
+#include <istream>
+#include <limits>
+
+#include "absl/base/optimization.h"
+#include "absl/random/internal/fast_uniform_bits.h"
+#include "absl/random/internal/iostream_state_saver.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+// absl::bernoulli_distribution is a drop in replacement for
+// std::bernoulli_distribution. It guarantees that (given a perfect
+// UniformRandomBitGenerator) the acceptance probability is *exactly* equal to
+// the given double.
+//
+// The implementation assumes that double is IEEE754
+class bernoulli_distribution {
+ public:
+ using result_type = bool;
+
+ class param_type {
+ public:
+ using distribution_type = bernoulli_distribution;
+
+ explicit param_type(double p = 0.5) : prob_(p) {
+ assert(p >= 0.0 && p <= 1.0);
+ }
+
+ double p() const { return prob_; }
+
+ friend bool operator==(const param_type& p1, const param_type& p2) {
+ return p1.p() == p2.p();
+ }
+ friend bool operator!=(const param_type& p1, const param_type& p2) {
+ return p1.p() != p2.p();
+ }
+
+ private:
+ double prob_;
+ };
+
+ bernoulli_distribution() : bernoulli_distribution(0.5) {}
+
+ explicit bernoulli_distribution(double p) : param_(p) {}
+
+ explicit bernoulli_distribution(param_type p) : param_(p) {}
+
+ // no-op
+ void reset() {}
+
+ template <typename URBG>
+ bool operator()(URBG& g) { // NOLINT(runtime/references)
+ return Generate(param_.p(), g);
+ }
+
+ template <typename URBG>
+ bool operator()(URBG& g, // NOLINT(runtime/references)
+ const param_type& param) {
+ return Generate(param.p(), g);
+ }
+
+ param_type param() const { return param_; }
+ void param(const param_type& param) { param_ = param; }
+
+ double p() const { return param_.p(); }
+
+ result_type(min)() const { return false; }
+ result_type(max)() const { return true; }
+
+ friend bool operator==(const bernoulli_distribution& d1,
+ const bernoulli_distribution& d2) {
+ return d1.param_ == d2.param_;
+ }
+
+ friend bool operator!=(const bernoulli_distribution& d1,
+ const bernoulli_distribution& d2) {
+ return d1.param_ != d2.param_;
+ }
+
+ private:
+ static constexpr uint64_t kP32 = static_cast<uint64_t>(1) << 32;
+
+ template <typename URBG>
+ static bool Generate(double p, URBG& g); // NOLINT(runtime/references)
+
+ param_type param_;
+};
+
+template <typename CharT, typename Traits>
+std::basic_ostream<CharT, Traits>& operator<<(
+ std::basic_ostream<CharT, Traits>& os, // NOLINT(runtime/references)
+ const bernoulli_distribution& x) {
+ auto saver = random_internal::make_ostream_state_saver(os);
+ os.precision(random_internal::stream_precision_helper<double>::kPrecision);
+ os << x.p();
+ return os;
+}
+
+template <typename CharT, typename Traits>
+std::basic_istream<CharT, Traits>& operator>>(
+ std::basic_istream<CharT, Traits>& is, // NOLINT(runtime/references)
+ bernoulli_distribution& x) { // NOLINT(runtime/references)
+ auto saver = random_internal::make_istream_state_saver(is);
+ auto p = random_internal::read_floating_point<double>(is);
+ if (!is.fail()) {
+ x.param(bernoulli_distribution::param_type(p));
+ }
+ return is;
+}
+
+template <typename URBG>
+bool bernoulli_distribution::Generate(double p,
+ URBG& g) { // NOLINT(runtime/references)
+ random_internal::FastUniformBits<uint32_t> fast_u32;
+
+ while (true) {
+ // There are two aspects of the definition of `c` below that are worth
+ // commenting on. First, because `p` is in the range [0, 1], `c` is in the
+ // range [0, 2^32] which does not fit in a uint32_t and therefore requires
+ // 64 bits.
+ //
+ // Second, `c` is constructed by first casting explicitly to a signed
+ // integer and then converting implicitly to an unsigned integer of the same
+ // size. This is done because the hardware conversion instructions produce
+ // signed integers from double; if taken as a uint64_t the conversion would
+ // be wrong for doubles greater than 2^63 (not relevant in this use-case).
+ // If converted directly to an unsigned integer, the compiler would end up
+ // emitting code to handle such large values that are not relevant due to
+ // the known bounds on `c`. To avoid these extra instructions this
+ // implementation converts first to the signed type and then use the
+ // implicit conversion to unsigned (which is a no-op).
+ const uint64_t c = static_cast<int64_t>(p * kP32);
+ const uint32_t v = fast_u32(g);
+ // FAST PATH: this path fails with probability 1/2^32. Note that simply
+ // returning v <= c would approximate P very well (up to an absolute error
+ // of 1/2^32); the slow path (taken in that range of possible error, in the
+ // case of equality) eliminates the remaining error.
+ if (ABSL_PREDICT_TRUE(v != c)) return v < c;
+
+ // It is guaranteed that `q` is strictly less than 1, because if `q` were
+ // greater than or equal to 1, the same would be true for `p`. Certainly `p`
+ // cannot be greater than 1, and if `p == 1`, then the fast path would
+ // necessary have been taken already.
+ const double q = static_cast<double>(c) / kP32;
+
+ // The probability of acceptance on the fast path is `q` and so the
+ // probability of acceptance here should be `p - q`.
+ //
+ // Note that `q` is obtained from `p` via some shifts and conversions, the
+ // upshot of which is that `q` is simply `p` with some of the
+ // least-significant bits of its mantissa set to zero. This means that the
+ // difference `p - q` will not have any rounding errors. To see why, pretend
+ // that double has 10 bits of resolution and q is obtained from `p` in such
+ // a way that the 4 least-significant bits of its mantissa are set to zero.
+ // For example:
+ // p = 1.1100111011 * 2^-1
+ // q = 1.1100110000 * 2^-1
+ // p - q = 1.011 * 2^-8
+ // The difference `p - q` has exactly the nonzero mantissa bits that were
+ // "lost" in `q` producing a number which is certainly representable in a
+ // double.
+ const double left = p - q;
+
+ // By construction, the probability of being on this slow path is 1/2^32, so
+ // P(accept in slow path) = P(accept| in slow path) * P(slow path),
+ // which means the probability of acceptance here is `1 / (left * kP32)`:
+ const double here = left * kP32;
+
+ // The simplest way to compute the result of this trial is to repeat the
+ // whole algorithm with the new probability. This terminates because even
+ // given arbitrarily unfriendly "random" bits, each iteration either
+ // multiplies a tiny probability by 2^32 (if c == 0) or strips off some
+ // number of nonzero mantissa bits. That process is bounded.
+ if (here == 0) return false;
+ p = here;
+ }
+}
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_RANDOM_BERNOULLI_DISTRIBUTION_H_
diff --git a/third_party/abseil/src/absl/random/bernoulli_distribution_test.cc b/third_party/abseil/src/absl/random/bernoulli_distribution_test.cc
new file mode 100644
index 0000000..b250f87
--- /dev/null
+++ b/third_party/abseil/src/absl/random/bernoulli_distribution_test.cc
@@ -0,0 +1,217 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/random/bernoulli_distribution.h"
+
+#include <cmath>
+#include <cstddef>
+#include <random>
+#include <sstream>
+#include <utility>
+
+#include "gtest/gtest.h"
+#include "absl/random/internal/pcg_engine.h"
+#include "absl/random/internal/sequence_urbg.h"
+#include "absl/random/random.h"
+
+namespace {
+
+class BernoulliTest : public testing::TestWithParam<std::pair<double, size_t>> {
+};
+
+TEST_P(BernoulliTest, Serialize) {
+ const double d = GetParam().first;
+ absl::bernoulli_distribution before(d);
+
+ {
+ absl::bernoulli_distribution via_param{
+ absl::bernoulli_distribution::param_type(d)};
+ EXPECT_EQ(via_param, before);
+ }
+
+ std::stringstream ss;
+ ss << before;
+ absl::bernoulli_distribution after(0.6789);
+
+ EXPECT_NE(before.p(), after.p());
+ EXPECT_NE(before.param(), after.param());
+ EXPECT_NE(before, after);
+
+ ss >> after;
+
+ EXPECT_EQ(before.p(), after.p());
+ EXPECT_EQ(before.param(), after.param());
+ EXPECT_EQ(before, after);
+}
+
+TEST_P(BernoulliTest, Accuracy) {
+ // Sadly, the claim to fame for this implementation is precise accuracy, which
+ // is very, very hard to measure, the improvements come as trials approach the
+ // limit of double accuracy; thus the outcome differs from the
+ // std::bernoulli_distribution with a probability of approximately 1 in 2^-53.
+ const std::pair<double, size_t> para = GetParam();
+ size_t trials = para.second;
+ double p = para.first;
+
+ // We use a fixed bit generator for distribution accuracy tests. This allows
+ // these tests to be deterministic, while still testing the qualify of the
+ // implementation.
+ absl::random_internal::pcg64_2018_engine rng(0x2B7E151628AED2A6);
+
+ size_t yes = 0;
+ absl::bernoulli_distribution dist(p);
+ for (size_t i = 0; i < trials; ++i) {
+ if (dist(rng)) yes++;
+ }
+
+ // Compute the distribution parameters for a binomial test, using a normal
+ // approximation for the confidence interval, as there are a sufficiently
+ // large number of trials that the central limit theorem applies.
+ const double stddev_p = std::sqrt((p * (1.0 - p)) / trials);
+ const double expected = trials * p;
+ const double stddev = trials * stddev_p;
+
+ // 5 sigma, approved by Richard Feynman
+ EXPECT_NEAR(yes, expected, 5 * stddev)
+ << "@" << p << ", "
+ << std::abs(static_cast<double>(yes) - expected) / stddev << " stddev";
+}
+
+// There must be many more trials to make the mean approximately normal for `p`
+// closes to 0 or 1.
+INSTANTIATE_TEST_SUITE_P(
+ All, BernoulliTest,
+ ::testing::Values(
+ // Typical values.
+ std::make_pair(0, 30000), std::make_pair(1e-3, 30000000),
+ std::make_pair(0.1, 3000000), std::make_pair(0.5, 3000000),
+ std::make_pair(0.9, 30000000), std::make_pair(0.999, 30000000),
+ std::make_pair(1, 30000),
+ // Boundary cases.
+ std::make_pair(std::nextafter(1.0, 0.0), 1), // ~1 - epsilon
+ std::make_pair(std::numeric_limits<double>::epsilon(), 1),
+ std::make_pair(std::nextafter(std::numeric_limits<double>::min(),
+ 1.0), // min + epsilon
+ 1),
+ std::make_pair(std::numeric_limits<double>::min(), // smallest normal
+ 1),
+ std::make_pair(
+ std::numeric_limits<double>::denorm_min(), // smallest denorm
+ 1),
+ std::make_pair(std::numeric_limits<double>::min() / 2, 1), // denorm
+ std::make_pair(std::nextafter(std::numeric_limits<double>::min(),
+ 0.0), // denorm_max
+ 1)));
+
+// NOTE: absl::bernoulli_distribution is not guaranteed to be stable.
+TEST(BernoulliTest, StabilityTest) {
+ // absl::bernoulli_distribution stability relies on FastUniformBits and
+ // integer arithmetic.
+ absl::random_internal::sequence_urbg urbg({
+ 0x0003eb76f6f7f755ull, 0xFFCEA50FDB2F953Bull, 0xC332DDEFBE6C5AA5ull,
+ 0x6558218568AB9702ull, 0x2AEF7DAD5B6E2F84ull, 0x1521B62829076170ull,
+ 0xECDD4775619F1510ull, 0x13CCA830EB61BD96ull, 0x0334FE1EAA0363CFull,
+ 0xB5735C904C70A239ull, 0xD59E9E0BCBAADE14ull, 0xEECC86BC60622CA7ull,
+ 0x4864f22c059bf29eull, 0x247856d8b862665cull, 0xe46e86e9a1337e10ull,
+ 0xd8c8541f3519b133ull, 0xe75b5162c567b9e4ull, 0xf732e5ded7009c5bull,
+ 0xb170b98353121eacull, 0x1ec2e8986d2362caull, 0x814c8e35fe9a961aull,
+ 0x0c3cd59c9b638a02ull, 0xcb3bb6478a07715cull, 0x1224e62c978bbc7full,
+ 0x671ef2cb04e81f6eull, 0x3c1cbd811eaf1808ull, 0x1bbc23cfa8fac721ull,
+ 0xa4c2cda65e596a51ull, 0xb77216fad37adf91ull, 0x836d794457c08849ull,
+ 0xe083df03475f49d7ull, 0xbc9feb512e6b0d6cull, 0xb12d74fdd718c8c5ull,
+ 0x12ff09653bfbe4caull, 0x8dd03a105bc4ee7eull, 0x5738341045ba0d85ull,
+ 0xe3fd722dc65ad09eull, 0x5a14fd21ea2a5705ull, 0x14e6ea4d6edb0c73ull,
+ 0x275b0dc7e0a18acfull, 0x36cebe0d2653682eull, 0x0361e9b23861596bull,
+ });
+
+ // Generate a string of '0' and '1' for the distribution output.
+ auto generate = [&urbg](absl::bernoulli_distribution& dist) {
+ std::string output;
+ output.reserve(36);
+ urbg.reset();
+ for (int i = 0; i < 35; i++) {
+ output.append(dist(urbg) ? "1" : "0");
+ }
+ return output;
+ };
+
+ const double kP = 0.0331289862362;
+ {
+ absl::bernoulli_distribution dist(kP);
+ auto v = generate(dist);
+ EXPECT_EQ(35, urbg.invocations());
+ EXPECT_EQ(v, "00000000000010000000000010000000000") << dist;
+ }
+ {
+ absl::bernoulli_distribution dist(kP * 10.0);
+ auto v = generate(dist);
+ EXPECT_EQ(35, urbg.invocations());
+ EXPECT_EQ(v, "00000100010010010010000011000011010") << dist;
+ }
+ {
+ absl::bernoulli_distribution dist(kP * 20.0);
+ auto v = generate(dist);
+ EXPECT_EQ(35, urbg.invocations());
+ EXPECT_EQ(v, "00011110010110110011011111110111011") << dist;
+ }
+ {
+ absl::bernoulli_distribution dist(1.0 - kP);
+ auto v = generate(dist);
+ EXPECT_EQ(35, urbg.invocations());
+ EXPECT_EQ(v, "11111111111111111111011111111111111") << dist;
+ }
+}
+
+TEST(BernoulliTest, StabilityTest2) {
+ absl::random_internal::sequence_urbg urbg(
+ {0x0003eb76f6f7f755ull, 0xFFCEA50FDB2F953Bull, 0xC332DDEFBE6C5AA5ull,
+ 0x6558218568AB9702ull, 0x2AEF7DAD5B6E2F84ull, 0x1521B62829076170ull,
+ 0xECDD4775619F1510ull, 0x13CCA830EB61BD96ull, 0x0334FE1EAA0363CFull,
+ 0xB5735C904C70A239ull, 0xD59E9E0BCBAADE14ull, 0xEECC86BC60622CA7ull});
+
+ // Generate a string of '0' and '1' for the distribution output.
+ auto generate = [&urbg](absl::bernoulli_distribution& dist) {
+ std::string output;
+ output.reserve(13);
+ urbg.reset();
+ for (int i = 0; i < 12; i++) {
+ output.append(dist(urbg) ? "1" : "0");
+ }
+ return output;
+ };
+
+ constexpr double b0 = 1.0 / 13.0 / 0.2;
+ constexpr double b1 = 2.0 / 13.0 / 0.2;
+ constexpr double b3 = (5.0 / 13.0 / 0.2) - ((1 - b0) + (1 - b1) + (1 - b1));
+ {
+ absl::bernoulli_distribution dist(b0);
+ auto v = generate(dist);
+ EXPECT_EQ(12, urbg.invocations());
+ EXPECT_EQ(v, "000011100101") << dist;
+ }
+ {
+ absl::bernoulli_distribution dist(b1);
+ auto v = generate(dist);
+ EXPECT_EQ(12, urbg.invocations());
+ EXPECT_EQ(v, "001111101101") << dist;
+ }
+ {
+ absl::bernoulli_distribution dist(b3);
+ auto v = generate(dist);
+ EXPECT_EQ(12, urbg.invocations());
+ EXPECT_EQ(v, "001111101111") << dist;
+ }
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/random/beta_distribution.h b/third_party/abseil/src/absl/random/beta_distribution.h
new file mode 100644
index 0000000..c154066
--- /dev/null
+++ b/third_party/abseil/src/absl/random/beta_distribution.h
@@ -0,0 +1,427 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_RANDOM_BETA_DISTRIBUTION_H_
+#define ABSL_RANDOM_BETA_DISTRIBUTION_H_
+
+#include <cassert>
+#include <cmath>
+#include <istream>
+#include <limits>
+#include <ostream>
+#include <type_traits>
+
+#include "absl/meta/type_traits.h"
+#include "absl/random/internal/fast_uniform_bits.h"
+#include "absl/random/internal/fastmath.h"
+#include "absl/random/internal/generate_real.h"
+#include "absl/random/internal/iostream_state_saver.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+// absl::beta_distribution:
+// Generate a floating-point variate conforming to a Beta distribution:
+// pdf(x) \propto x^(alpha-1) * (1-x)^(beta-1),
+// where the params alpha and beta are both strictly positive real values.
+//
+// The support is the open interval (0, 1), but the return value might be equal
+// to 0 or 1, due to numerical errors when alpha and beta are very different.
+//
+// Usage note: One usage is that alpha and beta are counts of number of
+// successes and failures. When the total number of trials are large, consider
+// approximating a beta distribution with a Gaussian distribution with the same
+// mean and variance. One could use the skewness, which depends only on the
+// smaller of alpha and beta when the number of trials are sufficiently large,
+// to quantify how far a beta distribution is from the normal distribution.
+template <typename RealType = double>
+class beta_distribution {
+ public:
+ using result_type = RealType;
+
+ class param_type {
+ public:
+ using distribution_type = beta_distribution;
+
+ explicit param_type(result_type alpha, result_type beta)
+ : alpha_(alpha), beta_(beta) {
+ assert(alpha >= 0);
+ assert(beta >= 0);
+ assert(alpha <= (std::numeric_limits<result_type>::max)());
+ assert(beta <= (std::numeric_limits<result_type>::max)());
+ if (alpha == 0 || beta == 0) {
+ method_ = DEGENERATE_SMALL;
+ x_ = (alpha >= beta) ? 1 : 0;
+ return;
+ }
+ // a_ = min(beta, alpha), b_ = max(beta, alpha).
+ if (beta < alpha) {
+ inverted_ = true;
+ a_ = beta;
+ b_ = alpha;
+ } else {
+ inverted_ = false;
+ a_ = alpha;
+ b_ = beta;
+ }
+ if (a_ <= 1 && b_ >= ThresholdForLargeA()) {
+ method_ = DEGENERATE_SMALL;
+ x_ = inverted_ ? result_type(1) : result_type(0);
+ return;
+ }
+ // For threshold values, see also:
+ // Evaluation of Beta Generation Algorithms, Ying-Chao Hung, et. al.
+ // February, 2009.
+ if ((b_ < 1.0 && a_ + b_ <= 1.2) || a_ <= ThresholdForSmallA()) {
+ // Choose Joehnk over Cheng when it's faster or when Cheng encounters
+ // numerical issues.
+ method_ = JOEHNK;
+ a_ = result_type(1) / alpha_;
+ b_ = result_type(1) / beta_;
+ if (std::isinf(a_) || std::isinf(b_)) {
+ method_ = DEGENERATE_SMALL;
+ x_ = inverted_ ? result_type(1) : result_type(0);
+ }
+ return;
+ }
+ if (a_ >= ThresholdForLargeA()) {
+ method_ = DEGENERATE_LARGE;
+ // Note: on PPC for long double, evaluating
+ // `std::numeric_limits::max() / ThresholdForLargeA` results in NaN.
+ result_type r = a_ / b_;
+ x_ = (inverted_ ? result_type(1) : r) / (1 + r);
+ return;
+ }
+ x_ = a_ + b_;
+ log_x_ = std::log(x_);
+ if (a_ <= 1) {
+ method_ = CHENG_BA;
+ y_ = result_type(1) / a_;
+ gamma_ = a_ + a_;
+ return;
+ }
+ method_ = CHENG_BB;
+ result_type r = (a_ - 1) / (b_ - 1);
+ y_ = std::sqrt((1 + r) / (b_ * r * 2 - r + 1));
+ gamma_ = a_ + result_type(1) / y_;
+ }
+
+ result_type alpha() const { return alpha_; }
+ result_type beta() const { return beta_; }
+
+ friend bool operator==(const param_type& a, const param_type& b) {
+ return a.alpha_ == b.alpha_ && a.beta_ == b.beta_;
+ }
+
+ friend bool operator!=(const param_type& a, const param_type& b) {
+ return !(a == b);
+ }
+
+ private:
+ friend class beta_distribution;
+
+#ifdef _MSC_VER
+ // MSVC does not have constexpr implementations for std::log and std::exp
+ // so they are computed at runtime.
+#define ABSL_RANDOM_INTERNAL_LOG_EXP_CONSTEXPR
+#else
+#define ABSL_RANDOM_INTERNAL_LOG_EXP_CONSTEXPR constexpr
+#endif
+
+ // The threshold for whether std::exp(1/a) is finite.
+ // Note that this value is quite large, and a smaller a_ is NOT abnormal.
+ static ABSL_RANDOM_INTERNAL_LOG_EXP_CONSTEXPR result_type
+ ThresholdForSmallA() {
+ return result_type(1) /
+ std::log((std::numeric_limits<result_type>::max)());
+ }
+
+ // The threshold for whether a * std::log(a) is finite.
+ static ABSL_RANDOM_INTERNAL_LOG_EXP_CONSTEXPR result_type
+ ThresholdForLargeA() {
+ return std::exp(
+ std::log((std::numeric_limits<result_type>::max)()) -
+ std::log(std::log((std::numeric_limits<result_type>::max)())) -
+ ThresholdPadding());
+ }
+
+#undef ABSL_RANDOM_INTERNAL_LOG_EXP_CONSTEXPR
+
+ // Pad the threshold for large A for long double on PPC. This is done via a
+ // template specialization below.
+ static constexpr result_type ThresholdPadding() { return 0; }
+
+ enum Method {
+ JOEHNK, // Uses algorithm Joehnk
+ CHENG_BA, // Uses algorithm BA in Cheng
+ CHENG_BB, // Uses algorithm BB in Cheng
+
+ // Note: See also:
+ // Hung et al. Evaluation of beta generation algorithms. Communications
+ // in Statistics-Simulation and Computation 38.4 (2009): 750-770.
+ // especially:
+ // Zechner, Heinz, and Ernst Stadlober. Generating beta variates via
+ // patchwork rejection. Computing 50.1 (1993): 1-18.
+
+ DEGENERATE_SMALL, // a_ is abnormally small.
+ DEGENERATE_LARGE, // a_ is abnormally large.
+ };
+
+ result_type alpha_;
+ result_type beta_;
+
+ result_type a_; // the smaller of {alpha, beta}, or 1.0/alpha_ in JOEHNK
+ result_type b_; // the larger of {alpha, beta}, or 1.0/beta_ in JOEHNK
+ result_type x_; // alpha + beta, or the result in degenerate cases
+ result_type log_x_; // log(x_)
+ result_type y_; // "beta" in Cheng
+ result_type gamma_; // "gamma" in Cheng
+
+ Method method_;
+
+ // Placing this last for optimal alignment.
+ // Whether alpha_ != a_, i.e. true iff alpha_ > beta_.
+ bool inverted_;
+
+ static_assert(std::is_floating_point<RealType>::value,
+ "Class-template absl::beta_distribution<> must be "
+ "parameterized using a floating-point type.");
+ };
+
+ beta_distribution() : beta_distribution(1) {}
+
+ explicit beta_distribution(result_type alpha, result_type beta = 1)
+ : param_(alpha, beta) {}
+
+ explicit beta_distribution(const param_type& p) : param_(p) {}
+
+ void reset() {}
+
+ // Generating functions
+ template <typename URBG>
+ result_type operator()(URBG& g) { // NOLINT(runtime/references)
+ return (*this)(g, param_);
+ }
+
+ template <typename URBG>
+ result_type operator()(URBG& g, // NOLINT(runtime/references)
+ const param_type& p);
+
+ param_type param() const { return param_; }
+ void param(const param_type& p) { param_ = p; }
+
+ result_type(min)() const { return 0; }
+ result_type(max)() const { return 1; }
+
+ result_type alpha() const { return param_.alpha(); }
+ result_type beta() const { return param_.beta(); }
+
+ friend bool operator==(const beta_distribution& a,
+ const beta_distribution& b) {
+ return a.param_ == b.param_;
+ }
+ friend bool operator!=(const beta_distribution& a,
+ const beta_distribution& b) {
+ return a.param_ != b.param_;
+ }
+
+ private:
+ template <typename URBG>
+ result_type AlgorithmJoehnk(URBG& g, // NOLINT(runtime/references)
+ const param_type& p);
+
+ template <typename URBG>
+ result_type AlgorithmCheng(URBG& g, // NOLINT(runtime/references)
+ const param_type& p);
+
+ template <typename URBG>
+ result_type DegenerateCase(URBG& g, // NOLINT(runtime/references)
+ const param_type& p) {
+ if (p.method_ == param_type::DEGENERATE_SMALL && p.alpha_ == p.beta_) {
+ // Returns 0 or 1 with equal probability.
+ random_internal::FastUniformBits<uint8_t> fast_u8;
+ return static_cast<result_type>((fast_u8(g) & 0x10) !=
+ 0); // pick any single bit.
+ }
+ return p.x_;
+ }
+
+ param_type param_;
+ random_internal::FastUniformBits<uint64_t> fast_u64_;
+};
+
+#if defined(__powerpc64__) || defined(__PPC64__) || defined(__powerpc__) || \
+ defined(__ppc__) || defined(__PPC__)
+// PPC needs a more stringent boundary for long double.
+template <>
+constexpr long double
+beta_distribution<long double>::param_type::ThresholdPadding() {
+ return 10;
+}
+#endif
+
+template <typename RealType>
+template <typename URBG>
+typename beta_distribution<RealType>::result_type
+beta_distribution<RealType>::AlgorithmJoehnk(
+ URBG& g, // NOLINT(runtime/references)
+ const param_type& p) {
+ using random_internal::GeneratePositiveTag;
+ using random_internal::GenerateRealFromBits;
+ using real_type =
+ absl::conditional_t<std::is_same<RealType, float>::value, float, double>;
+
+ // Based on Joehnk, M. D. Erzeugung von betaverteilten und gammaverteilten
+ // Zufallszahlen. Metrika 8.1 (1964): 5-15.
+ // This method is described in Knuth, Vol 2 (Third Edition), pp 134.
+
+ result_type u, v, x, y, z;
+ for (;;) {
+ u = GenerateRealFromBits<real_type, GeneratePositiveTag, false>(
+ fast_u64_(g));
+ v = GenerateRealFromBits<real_type, GeneratePositiveTag, false>(
+ fast_u64_(g));
+
+ // Direct method. std::pow is slow for float, so rely on the optimizer to
+ // remove the std::pow() path for that case.
+ if (!std::is_same<float, result_type>::value) {
+ x = std::pow(u, p.a_);
+ y = std::pow(v, p.b_);
+ z = x + y;
+ if (z > 1) {
+ // Reject if and only if `x + y > 1.0`
+ continue;
+ }
+ if (z > 0) {
+ // When both alpha and beta are small, x and y are both close to 0, so
+ // divide by (x+y) directly may result in nan.
+ return x / z;
+ }
+ }
+
+ // Log transform.
+ // x = log( pow(u, p.a_) ), y = log( pow(v, p.b_) )
+ // since u, v <= 1.0, x, y < 0.
+ x = std::log(u) * p.a_;
+ y = std::log(v) * p.b_;
+ if (!std::isfinite(x) || !std::isfinite(y)) {
+ continue;
+ }
+ // z = log( pow(u, a) + pow(v, b) )
+ z = x > y ? (x + std::log(1 + std::exp(y - x)))
+ : (y + std::log(1 + std::exp(x - y)));
+ // Reject iff log(x+y) > 0.
+ if (z > 0) {
+ continue;
+ }
+ return std::exp(x - z);
+ }
+}
+
+template <typename RealType>
+template <typename URBG>
+typename beta_distribution<RealType>::result_type
+beta_distribution<RealType>::AlgorithmCheng(
+ URBG& g, // NOLINT(runtime/references)
+ const param_type& p) {
+ using random_internal::GeneratePositiveTag;
+ using random_internal::GenerateRealFromBits;
+ using real_type =
+ absl::conditional_t<std::is_same<RealType, float>::value, float, double>;
+
+ // Based on Cheng, Russell CH. Generating beta variates with nonintegral
+ // shape parameters. Communications of the ACM 21.4 (1978): 317-322.
+ // (https://dl.acm.org/citation.cfm?id=359482).
+ static constexpr result_type kLogFour =
+ result_type(1.3862943611198906188344642429163531361); // log(4)
+ static constexpr result_type kS =
+ result_type(2.6094379124341003746007593332261876); // 1+log(5)
+
+ const bool use_algorithm_ba = (p.method_ == param_type::CHENG_BA);
+ result_type u1, u2, v, w, z, r, s, t, bw_inv, lhs;
+ for (;;) {
+ u1 = GenerateRealFromBits<real_type, GeneratePositiveTag, false>(
+ fast_u64_(g));
+ u2 = GenerateRealFromBits<real_type, GeneratePositiveTag, false>(
+ fast_u64_(g));
+ v = p.y_ * std::log(u1 / (1 - u1));
+ w = p.a_ * std::exp(v);
+ bw_inv = result_type(1) / (p.b_ + w);
+ r = p.gamma_ * v - kLogFour;
+ s = p.a_ + r - w;
+ z = u1 * u1 * u2;
+ if (!use_algorithm_ba && s + kS >= 5 * z) {
+ break;
+ }
+ t = std::log(z);
+ if (!use_algorithm_ba && s >= t) {
+ break;
+ }
+ lhs = p.x_ * (p.log_x_ + std::log(bw_inv)) + r;
+ if (lhs >= t) {
+ break;
+ }
+ }
+ return p.inverted_ ? (1 - w * bw_inv) : w * bw_inv;
+}
+
+template <typename RealType>
+template <typename URBG>
+typename beta_distribution<RealType>::result_type
+beta_distribution<RealType>::operator()(URBG& g, // NOLINT(runtime/references)
+ const param_type& p) {
+ switch (p.method_) {
+ case param_type::JOEHNK:
+ return AlgorithmJoehnk(g, p);
+ case param_type::CHENG_BA:
+ ABSL_FALLTHROUGH_INTENDED;
+ case param_type::CHENG_BB:
+ return AlgorithmCheng(g, p);
+ default:
+ return DegenerateCase(g, p);
+ }
+}
+
+template <typename CharT, typename Traits, typename RealType>
+std::basic_ostream<CharT, Traits>& operator<<(
+ std::basic_ostream<CharT, Traits>& os, // NOLINT(runtime/references)
+ const beta_distribution<RealType>& x) {
+ auto saver = random_internal::make_ostream_state_saver(os);
+ os.precision(random_internal::stream_precision_helper<RealType>::kPrecision);
+ os << x.alpha() << os.fill() << x.beta();
+ return os;
+}
+
+template <typename CharT, typename Traits, typename RealType>
+std::basic_istream<CharT, Traits>& operator>>(
+ std::basic_istream<CharT, Traits>& is, // NOLINT(runtime/references)
+ beta_distribution<RealType>& x) { // NOLINT(runtime/references)
+ using result_type = typename beta_distribution<RealType>::result_type;
+ using param_type = typename beta_distribution<RealType>::param_type;
+ result_type alpha, beta;
+
+ auto saver = random_internal::make_istream_state_saver(is);
+ alpha = random_internal::read_floating_point<result_type>(is);
+ if (is.fail()) return is;
+ beta = random_internal::read_floating_point<result_type>(is);
+ if (!is.fail()) {
+ x.param(param_type(alpha, beta));
+ }
+ return is;
+}
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_RANDOM_BETA_DISTRIBUTION_H_
diff --git a/third_party/abseil/src/absl/random/beta_distribution_test.cc b/third_party/abseil/src/absl/random/beta_distribution_test.cc
new file mode 100644
index 0000000..277e4dc
--- /dev/null
+++ b/third_party/abseil/src/absl/random/beta_distribution_test.cc
@@ -0,0 +1,619 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/random/beta_distribution.h"
+
+#include <algorithm>
+#include <cstddef>
+#include <cstdint>
+#include <iterator>
+#include <random>
+#include <sstream>
+#include <string>
+#include <unordered_map>
+#include <vector>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/base/internal/raw_logging.h"
+#include "absl/random/internal/chi_square.h"
+#include "absl/random/internal/distribution_test_util.h"
+#include "absl/random/internal/pcg_engine.h"
+#include "absl/random/internal/sequence_urbg.h"
+#include "absl/random/random.h"
+#include "absl/strings/str_cat.h"
+#include "absl/strings/str_format.h"
+#include "absl/strings/str_replace.h"
+#include "absl/strings/strip.h"
+
+namespace {
+
+template <typename IntType>
+class BetaDistributionInterfaceTest : public ::testing::Test {};
+
+using RealTypes = ::testing::Types<float, double, long double>;
+TYPED_TEST_CASE(BetaDistributionInterfaceTest, RealTypes);
+
+TYPED_TEST(BetaDistributionInterfaceTest, SerializeTest) {
+ // The threshold for whether std::exp(1/a) is finite.
+ const TypeParam kSmallA =
+ 1.0f / std::log((std::numeric_limits<TypeParam>::max)());
+ // The threshold for whether a * std::log(a) is finite.
+ const TypeParam kLargeA =
+ std::exp(std::log((std::numeric_limits<TypeParam>::max)()) -
+ std::log(std::log((std::numeric_limits<TypeParam>::max)())));
+ const TypeParam kLargeAPPC = std::exp(
+ std::log((std::numeric_limits<TypeParam>::max)()) -
+ std::log(std::log((std::numeric_limits<TypeParam>::max)())) - 10.0f);
+ using param_type = typename absl::beta_distribution<TypeParam>::param_type;
+
+ constexpr int kCount = 1000;
+ absl::InsecureBitGen gen;
+ const TypeParam kValues[] = {
+ TypeParam(1e-20), TypeParam(1e-12), TypeParam(1e-8), TypeParam(1e-4),
+ TypeParam(1e-3), TypeParam(0.1), TypeParam(0.25),
+ std::nextafter(TypeParam(0.5), TypeParam(0)), // 0.5 - epsilon
+ std::nextafter(TypeParam(0.5), TypeParam(1)), // 0.5 + epsilon
+ TypeParam(0.5), TypeParam(1.0), //
+ std::nextafter(TypeParam(1), TypeParam(0)), // 1 - epsilon
+ std::nextafter(TypeParam(1), TypeParam(2)), // 1 + epsilon
+ TypeParam(12.5), TypeParam(1e2), TypeParam(1e8), TypeParam(1e12),
+ TypeParam(1e20), //
+ kSmallA, //
+ std::nextafter(kSmallA, TypeParam(0)), //
+ std::nextafter(kSmallA, TypeParam(1)), //
+ kLargeA, //
+ std::nextafter(kLargeA, TypeParam(0)), //
+ std::nextafter(kLargeA, std::numeric_limits<TypeParam>::max()),
+ kLargeAPPC, //
+ std::nextafter(kLargeAPPC, TypeParam(0)),
+ std::nextafter(kLargeAPPC, std::numeric_limits<TypeParam>::max()),
+ // Boundary cases.
+ std::numeric_limits<TypeParam>::max(),
+ std::numeric_limits<TypeParam>::epsilon(),
+ std::nextafter(std::numeric_limits<TypeParam>::min(),
+ TypeParam(1)), // min + epsilon
+ std::numeric_limits<TypeParam>::min(), // smallest normal
+ std::numeric_limits<TypeParam>::denorm_min(), // smallest denorm
+ std::numeric_limits<TypeParam>::min() / 2, // denorm
+ std::nextafter(std::numeric_limits<TypeParam>::min(),
+ TypeParam(0)), // denorm_max
+ };
+ for (TypeParam alpha : kValues) {
+ for (TypeParam beta : kValues) {
+ ABSL_INTERNAL_LOG(
+ INFO, absl::StrFormat("Smoke test for Beta(%a, %a)", alpha, beta));
+
+ param_type param(alpha, beta);
+ absl::beta_distribution<TypeParam> before(alpha, beta);
+ EXPECT_EQ(before.alpha(), param.alpha());
+ EXPECT_EQ(before.beta(), param.beta());
+
+ {
+ absl::beta_distribution<TypeParam> via_param(param);
+ EXPECT_EQ(via_param, before);
+ EXPECT_EQ(via_param.param(), before.param());
+ }
+
+ // Smoke test.
+ for (int i = 0; i < kCount; ++i) {
+ auto sample = before(gen);
+ EXPECT_TRUE(std::isfinite(sample));
+ EXPECT_GE(sample, before.min());
+ EXPECT_LE(sample, before.max());
+ }
+
+ // Validate stream serialization.
+ std::stringstream ss;
+ ss << before;
+ absl::beta_distribution<TypeParam> after(3.8f, 1.43f);
+ EXPECT_NE(before.alpha(), after.alpha());
+ EXPECT_NE(before.beta(), after.beta());
+ EXPECT_NE(before.param(), after.param());
+ EXPECT_NE(before, after);
+
+ ss >> after;
+
+#if defined(__powerpc64__) || defined(__PPC64__) || defined(__powerpc__) || \
+ defined(__ppc__) || defined(__PPC__)
+ if (std::is_same<TypeParam, long double>::value) {
+ // Roundtripping floating point values requires sufficient precision
+ // to reconstruct the exact value. It turns out that long double
+ // has some errors doing this on ppc.
+ if (alpha <= std::numeric_limits<double>::max() &&
+ alpha >= std::numeric_limits<double>::lowest()) {
+ EXPECT_EQ(static_cast<double>(before.alpha()),
+ static_cast<double>(after.alpha()))
+ << ss.str();
+ }
+ if (beta <= std::numeric_limits<double>::max() &&
+ beta >= std::numeric_limits<double>::lowest()) {
+ EXPECT_EQ(static_cast<double>(before.beta()),
+ static_cast<double>(after.beta()))
+ << ss.str();
+ }
+ continue;
+ }
+#endif
+
+ EXPECT_EQ(before.alpha(), after.alpha());
+ EXPECT_EQ(before.beta(), after.beta());
+ EXPECT_EQ(before, after) //
+ << ss.str() << " " //
+ << (ss.good() ? "good " : "") //
+ << (ss.bad() ? "bad " : "") //
+ << (ss.eof() ? "eof " : "") //
+ << (ss.fail() ? "fail " : "");
+ }
+ }
+}
+
+TYPED_TEST(BetaDistributionInterfaceTest, DegenerateCases) {
+ // We use a fixed bit generator for distribution accuracy tests. This allows
+ // these tests to be deterministic, while still testing the qualify of the
+ // implementation.
+ absl::random_internal::pcg64_2018_engine rng(0x2B7E151628AED2A6);
+
+ // Extreme cases when the params are abnormal.
+ constexpr int kCount = 1000;
+ const TypeParam kSmallValues[] = {
+ std::numeric_limits<TypeParam>::min(),
+ std::numeric_limits<TypeParam>::denorm_min(),
+ std::nextafter(std::numeric_limits<TypeParam>::min(),
+ TypeParam(0)), // denorm_max
+ std::numeric_limits<TypeParam>::epsilon(),
+ };
+ const TypeParam kLargeValues[] = {
+ std::numeric_limits<TypeParam>::max() * static_cast<TypeParam>(0.9999),
+ std::numeric_limits<TypeParam>::max() - 1,
+ std::numeric_limits<TypeParam>::max(),
+ };
+ {
+ // Small alpha and beta.
+ // Useful WolframAlpha plots:
+ // * plot InverseBetaRegularized[x, 0.0001, 0.0001] from 0.495 to 0.505
+ // * Beta[1.0, 0.0000001, 0.0000001]
+ // * Beta[0.9999, 0.0000001, 0.0000001]
+ for (TypeParam alpha : kSmallValues) {
+ for (TypeParam beta : kSmallValues) {
+ int zeros = 0;
+ int ones = 0;
+ absl::beta_distribution<TypeParam> d(alpha, beta);
+ for (int i = 0; i < kCount; ++i) {
+ TypeParam x = d(rng);
+ if (x == 0.0) {
+ zeros++;
+ } else if (x == 1.0) {
+ ones++;
+ }
+ }
+ EXPECT_EQ(ones + zeros, kCount);
+ if (alpha == beta) {
+ EXPECT_NE(ones, 0);
+ EXPECT_NE(zeros, 0);
+ }
+ }
+ }
+ }
+ {
+ // Small alpha, large beta.
+ // Useful WolframAlpha plots:
+ // * plot InverseBetaRegularized[x, 0.0001, 10000] from 0.995 to 1
+ // * Beta[0, 0.0000001, 1000000]
+ // * Beta[0.001, 0.0000001, 1000000]
+ // * Beta[1, 0.0000001, 1000000]
+ for (TypeParam alpha : kSmallValues) {
+ for (TypeParam beta : kLargeValues) {
+ absl::beta_distribution<TypeParam> d(alpha, beta);
+ for (int i = 0; i < kCount; ++i) {
+ EXPECT_EQ(d(rng), 0.0);
+ }
+ }
+ }
+ }
+ {
+ // Large alpha, small beta.
+ // Useful WolframAlpha plots:
+ // * plot InverseBetaRegularized[x, 10000, 0.0001] from 0 to 0.001
+ // * Beta[0.99, 1000000, 0.0000001]
+ // * Beta[1, 1000000, 0.0000001]
+ for (TypeParam alpha : kLargeValues) {
+ for (TypeParam beta : kSmallValues) {
+ absl::beta_distribution<TypeParam> d(alpha, beta);
+ for (int i = 0; i < kCount; ++i) {
+ EXPECT_EQ(d(rng), 1.0);
+ }
+ }
+ }
+ }
+ {
+ // Large alpha and beta.
+ absl::beta_distribution<TypeParam> d(std::numeric_limits<TypeParam>::max(),
+ std::numeric_limits<TypeParam>::max());
+ for (int i = 0; i < kCount; ++i) {
+ EXPECT_EQ(d(rng), 0.5);
+ }
+ }
+ {
+ // Large alpha and beta but unequal.
+ absl::beta_distribution<TypeParam> d(
+ std::numeric_limits<TypeParam>::max(),
+ std::numeric_limits<TypeParam>::max() * 0.9999);
+ for (int i = 0; i < kCount; ++i) {
+ TypeParam x = d(rng);
+ EXPECT_NE(x, 0.5f);
+ EXPECT_FLOAT_EQ(x, 0.500025f);
+ }
+ }
+}
+
+class BetaDistributionModel {
+ public:
+ explicit BetaDistributionModel(::testing::tuple<double, double> p)
+ : alpha_(::testing::get<0>(p)), beta_(::testing::get<1>(p)) {}
+
+ double Mean() const { return alpha_ / (alpha_ + beta_); }
+
+ double Variance() const {
+ return alpha_ * beta_ / (alpha_ + beta_ + 1) / (alpha_ + beta_) /
+ (alpha_ + beta_);
+ }
+
+ double Kurtosis() const {
+ return 3 + 6 *
+ ((alpha_ - beta_) * (alpha_ - beta_) * (alpha_ + beta_ + 1) -
+ alpha_ * beta_ * (2 + alpha_ + beta_)) /
+ alpha_ / beta_ / (alpha_ + beta_ + 2) / (alpha_ + beta_ + 3);
+ }
+
+ protected:
+ const double alpha_;
+ const double beta_;
+};
+
+class BetaDistributionTest
+ : public ::testing::TestWithParam<::testing::tuple<double, double>>,
+ public BetaDistributionModel {
+ public:
+ BetaDistributionTest() : BetaDistributionModel(GetParam()) {}
+
+ protected:
+ template <class D>
+ bool SingleZTestOnMeanAndVariance(double p, size_t samples);
+
+ template <class D>
+ bool SingleChiSquaredTest(double p, size_t samples, size_t buckets);
+
+ absl::InsecureBitGen rng_;
+};
+
+template <class D>
+bool BetaDistributionTest::SingleZTestOnMeanAndVariance(double p,
+ size_t samples) {
+ D dis(alpha_, beta_);
+
+ std::vector<double> data;
+ data.reserve(samples);
+ for (size_t i = 0; i < samples; i++) {
+ const double variate = dis(rng_);
+ EXPECT_FALSE(std::isnan(variate));
+ // Note that equality is allowed on both sides.
+ EXPECT_GE(variate, 0.0);
+ EXPECT_LE(variate, 1.0);
+ data.push_back(variate);
+ }
+
+ // We validate that the sample mean and sample variance are indeed from a
+ // Beta distribution with the given shape parameters.
+ const auto m = absl::random_internal::ComputeDistributionMoments(data);
+
+ // The variance of the sample mean is variance / n.
+ const double mean_stddev = std::sqrt(Variance() / static_cast<double>(m.n));
+
+ // The variance of the sample variance is (approximately):
+ // (kurtosis - 1) * variance^2 / n
+ const double variance_stddev = std::sqrt(
+ (Kurtosis() - 1) * Variance() * Variance() / static_cast<double>(m.n));
+ // z score for the sample variance.
+ const double z_variance = (m.variance - Variance()) / variance_stddev;
+
+ const double max_err = absl::random_internal::MaxErrorTolerance(p);
+ const double z_mean = absl::random_internal::ZScore(Mean(), m);
+ const bool pass =
+ absl::random_internal::Near("z", z_mean, 0.0, max_err) &&
+ absl::random_internal::Near("z_variance", z_variance, 0.0, max_err);
+ if (!pass) {
+ ABSL_INTERNAL_LOG(
+ INFO,
+ absl::StrFormat(
+ "Beta(%f, %f), "
+ "mean: sample %f, expect %f, which is %f stddevs away, "
+ "variance: sample %f, expect %f, which is %f stddevs away.",
+ alpha_, beta_, m.mean, Mean(),
+ std::abs(m.mean - Mean()) / mean_stddev, m.variance, Variance(),
+ std::abs(m.variance - Variance()) / variance_stddev));
+ }
+ return pass;
+}
+
+template <class D>
+bool BetaDistributionTest::SingleChiSquaredTest(double p, size_t samples,
+ size_t buckets) {
+ constexpr double kErr = 1e-7;
+ std::vector<double> cutoffs, expected;
+ const double bucket_width = 1.0 / static_cast<double>(buckets);
+ int i = 1;
+ int unmerged_buckets = 0;
+ for (; i < buckets; ++i) {
+ const double p = bucket_width * static_cast<double>(i);
+ const double boundary =
+ absl::random_internal::BetaIncompleteInv(alpha_, beta_, p);
+ // The intention is to add `boundary` to the list of `cutoffs`. It becomes
+ // problematic, however, when the boundary values are not monotone, due to
+ // numerical issues when computing the inverse regularized incomplete
+ // Beta function. In these cases, we merge that bucket with its previous
+ // neighbor and merge their expected counts.
+ if ((cutoffs.empty() && boundary < kErr) ||
+ (!cutoffs.empty() && boundary <= cutoffs.back())) {
+ unmerged_buckets++;
+ continue;
+ }
+ if (boundary >= 1.0 - 1e-10) {
+ break;
+ }
+ cutoffs.push_back(boundary);
+ expected.push_back(static_cast<double>(1 + unmerged_buckets) *
+ bucket_width * static_cast<double>(samples));
+ unmerged_buckets = 0;
+ }
+ cutoffs.push_back(std::numeric_limits<double>::infinity());
+ // Merge all remaining buckets.
+ expected.push_back(static_cast<double>(buckets - i + 1) * bucket_width *
+ static_cast<double>(samples));
+ // Make sure that we don't merge all the buckets, making this test
+ // meaningless.
+ EXPECT_GE(cutoffs.size(), 3) << alpha_ << ", " << beta_;
+
+ D dis(alpha_, beta_);
+
+ std::vector<int32_t> counts(cutoffs.size(), 0);
+ for (int i = 0; i < samples; i++) {
+ const double x = dis(rng_);
+ auto it = std::upper_bound(cutoffs.begin(), cutoffs.end(), x);
+ counts[std::distance(cutoffs.begin(), it)]++;
+ }
+
+ // Null-hypothesis is that the distribution is beta distributed with the
+ // provided alpha, beta params (not estimated from the data).
+ const int dof = cutoffs.size() - 1;
+
+ const double chi_square = absl::random_internal::ChiSquare(
+ counts.begin(), counts.end(), expected.begin(), expected.end());
+ const bool pass =
+ (absl::random_internal::ChiSquarePValue(chi_square, dof) >= p);
+ if (!pass) {
+ for (int i = 0; i < cutoffs.size(); i++) {
+ ABSL_INTERNAL_LOG(
+ INFO, absl::StrFormat("cutoff[%d] = %f, actual count %d, expected %d",
+ i, cutoffs[i], counts[i],
+ static_cast<int>(expected[i])));
+ }
+
+ ABSL_INTERNAL_LOG(
+ INFO, absl::StrFormat(
+ "Beta(%f, %f) %s %f, p = %f", alpha_, beta_,
+ absl::random_internal::kChiSquared, chi_square,
+ absl::random_internal::ChiSquarePValue(chi_square, dof)));
+ }
+ return pass;
+}
+
+TEST_P(BetaDistributionTest, TestSampleStatistics) {
+ static constexpr int kRuns = 20;
+ static constexpr double kPFail = 0.02;
+ const double p =
+ absl::random_internal::RequiredSuccessProbability(kPFail, kRuns);
+ static constexpr int kSampleCount = 10000;
+ static constexpr int kBucketCount = 100;
+ int failed = 0;
+ for (int i = 0; i < kRuns; ++i) {
+ if (!SingleZTestOnMeanAndVariance<absl::beta_distribution<double>>(
+ p, kSampleCount)) {
+ failed++;
+ }
+ if (!SingleChiSquaredTest<absl::beta_distribution<double>>(
+ 0.005, kSampleCount, kBucketCount)) {
+ failed++;
+ }
+ }
+ // Set so that the test is not flaky at --runs_per_test=10000
+ EXPECT_LE(failed, 5);
+}
+
+std::string ParamName(
+ const ::testing::TestParamInfo<::testing::tuple<double, double>>& info) {
+ std::string name = absl::StrCat("alpha_", ::testing::get<0>(info.param),
+ "__beta_", ::testing::get<1>(info.param));
+ return absl::StrReplaceAll(name, {{"+", "_"}, {"-", "_"}, {".", "_"}});
+}
+
+INSTANTIATE_TEST_CASE_P(
+ TestSampleStatisticsCombinations, BetaDistributionTest,
+ ::testing::Combine(::testing::Values(0.1, 0.2, 0.9, 1.1, 2.5, 10.0, 123.4),
+ ::testing::Values(0.1, 0.2, 0.9, 1.1, 2.5, 10.0, 123.4)),
+ ParamName);
+
+INSTANTIATE_TEST_CASE_P(
+ TestSampleStatistics_SelectedPairs, BetaDistributionTest,
+ ::testing::Values(std::make_pair(0.5, 1000), std::make_pair(1000, 0.5),
+ std::make_pair(900, 1000), std::make_pair(10000, 20000),
+ std::make_pair(4e5, 2e7), std::make_pair(1e7, 1e5)),
+ ParamName);
+
+// NOTE: absl::beta_distribution is not guaranteed to be stable.
+TEST(BetaDistributionTest, StabilityTest) {
+ // absl::beta_distribution stability relies on the stability of
+ // absl::random_interna::RandU64ToDouble, std::exp, std::log, std::pow,
+ // and std::sqrt.
+ //
+ // This test also depends on the stability of std::frexp.
+ using testing::ElementsAre;
+ absl::random_internal::sequence_urbg urbg({
+ 0xffff00000000e6c8ull, 0xffff0000000006c8ull, 0x800003766295CFA9ull,
+ 0x11C819684E734A41ull, 0x832603766295CFA9ull, 0x7fbe76c8b4395800ull,
+ 0xB3472DCA7B14A94Aull, 0x0003eb76f6f7f755ull, 0xFFCEA50FDB2F953Bull,
+ 0x13CCA830EB61BD96ull, 0x0334FE1EAA0363CFull, 0x00035C904C70A239ull,
+ 0x00009E0BCBAADE14ull, 0x0000000000622CA7ull, 0x4864f22c059bf29eull,
+ 0x247856d8b862665cull, 0xe46e86e9a1337e10ull, 0xd8c8541f3519b133ull,
+ 0xffe75b52c567b9e4ull, 0xfffff732e5709c5bull, 0xff1f7f0b983532acull,
+ 0x1ec2e8986d2362caull, 0xC332DDEFBE6C5AA5ull, 0x6558218568AB9702ull,
+ 0x2AEF7DAD5B6E2F84ull, 0x1521B62829076170ull, 0xECDD4775619F1510ull,
+ 0x814c8e35fe9a961aull, 0x0c3cd59c9b638a02ull, 0xcb3bb6478a07715cull,
+ 0x1224e62c978bbc7full, 0x671ef2cb04e81f6eull, 0x3c1cbd811eaf1808ull,
+ 0x1bbc23cfa8fac721ull, 0xa4c2cda65e596a51ull, 0xb77216fad37adf91ull,
+ 0x836d794457c08849ull, 0xe083df03475f49d7ull, 0xbc9feb512e6b0d6cull,
+ 0xb12d74fdd718c8c5ull, 0x12ff09653bfbe4caull, 0x8dd03a105bc4ee7eull,
+ 0x5738341045ba0d85ull, 0xf3fd722dc65ad09eull, 0xfa14fd21ea2a5705ull,
+ 0xffe6ea4d6edb0c73ull, 0xD07E9EFE2BF11FB4ull, 0x95DBDA4DAE909198ull,
+ 0xEAAD8E716B93D5A0ull, 0xD08ED1D0AFC725E0ull, 0x8E3C5B2F8E7594B7ull,
+ 0x8FF6E2FBF2122B64ull, 0x8888B812900DF01Cull, 0x4FAD5EA0688FC31Cull,
+ 0xD1CFF191B3A8C1ADull, 0x2F2F2218BE0E1777ull, 0xEA752DFE8B021FA1ull,
+ });
+
+ // Convert the real-valued result into a unit64 where we compare
+ // 5 (float) or 10 (double) decimal digits plus the base-2 exponent.
+ auto float_to_u64 = [](float d) {
+ int exp = 0;
+ auto f = std::frexp(d, &exp);
+ return (static_cast<uint64_t>(1e5 * f) * 10000) + std::abs(exp);
+ };
+ auto double_to_u64 = [](double d) {
+ int exp = 0;
+ auto f = std::frexp(d, &exp);
+ return (static_cast<uint64_t>(1e10 * f) * 10000) + std::abs(exp);
+ };
+
+ std::vector<uint64_t> output(20);
+ {
+ // Algorithm Joehnk (float)
+ absl::beta_distribution<float> dist(0.1f, 0.2f);
+ std::generate(std::begin(output), std::end(output),
+ [&] { return float_to_u64(dist(urbg)); });
+ EXPECT_EQ(44, urbg.invocations());
+ EXPECT_THAT(output, //
+ testing::ElementsAre(
+ 998340000, 619030004, 500000001, 999990000, 996280000,
+ 500000001, 844740004, 847210001, 999970000, 872320000,
+ 585480007, 933280000, 869080042, 647670031, 528240004,
+ 969980004, 626050008, 915930002, 833440033, 878040015));
+ }
+
+ urbg.reset();
+ {
+ // Algorithm Joehnk (double)
+ absl::beta_distribution<double> dist(0.1, 0.2);
+ std::generate(std::begin(output), std::end(output),
+ [&] { return double_to_u64(dist(urbg)); });
+ EXPECT_EQ(44, urbg.invocations());
+ EXPECT_THAT(
+ output, //
+ testing::ElementsAre(
+ 99834713000000, 61903356870004, 50000000000001, 99999721170000,
+ 99628374770000, 99999999990000, 84474397860004, 84721276240001,
+ 99997407490000, 87232528120000, 58548364780007, 93328932910000,
+ 86908237770042, 64767917930031, 52824581970004, 96998544140004,
+ 62605946270008, 91593604380002, 83345031740033, 87804397230015));
+ }
+
+ urbg.reset();
+ {
+ // Algorithm Cheng 1
+ absl::beta_distribution<double> dist(0.9, 2.0);
+ std::generate(std::begin(output), std::end(output),
+ [&] { return double_to_u64(dist(urbg)); });
+ EXPECT_EQ(62, urbg.invocations());
+ EXPECT_THAT(
+ output, //
+ testing::ElementsAre(
+ 62069004780001, 64433204450001, 53607416560000, 89644295430008,
+ 61434586310019, 55172615890002, 62187161490000, 56433684810003,
+ 80454622050005, 86418558710003, 92920514700001, 64645184680001,
+ 58549183380000, 84881283650005, 71078728590002, 69949694970000,
+ 73157461710001, 68592191300001, 70747623900000, 78584696930005));
+ }
+
+ urbg.reset();
+ {
+ // Algorithm Cheng 2
+ absl::beta_distribution<double> dist(1.5, 2.5);
+ std::generate(std::begin(output), std::end(output),
+ [&] { return double_to_u64(dist(urbg)); });
+ EXPECT_EQ(54, urbg.invocations());
+ EXPECT_THAT(
+ output, //
+ testing::ElementsAre(
+ 75000029250001, 76751482860001, 53264575220000, 69193133650005,
+ 78028324470013, 91573587560002, 59167523770000, 60658618560002,
+ 80075870540000, 94141320460004, 63196592770003, 78883906300002,
+ 96797992590001, 76907587800001, 56645167560000, 65408302280003,
+ 53401156320001, 64731238570000, 83065573750001, 79788333820001));
+ }
+}
+
+// This is an implementation-specific test. If any part of the implementation
+// changes, then it is likely that this test will change as well. Also, if
+// dependencies of the distribution change, such as RandU64ToDouble, then this
+// is also likely to change.
+TEST(BetaDistributionTest, AlgorithmBounds) {
+ {
+ absl::random_internal::sequence_urbg urbg(
+ {0x7fbe76c8b4395800ull, 0x8000000000000000ull});
+ // u=0.499, v=0.5
+ absl::beta_distribution<double> dist(1e-4, 1e-4);
+ double a = dist(urbg);
+ EXPECT_EQ(a, 2.0202860861567108529e-09);
+ EXPECT_EQ(2, urbg.invocations());
+ }
+
+ // Test that both the float & double algorithms appropriately reject the
+ // initial draw.
+ {
+ // 1/alpha = 1/beta = 2.
+ absl::beta_distribution<float> dist(0.5, 0.5);
+
+ // first two outputs are close to 1.0 - epsilon,
+ // thus: (u ^ 2 + v ^ 2) > 1.0
+ absl::random_internal::sequence_urbg urbg(
+ {0xffff00000006e6c8ull, 0xffff00000007c7c8ull, 0x800003766295CFA9ull,
+ 0x11C819684E734A41ull});
+ {
+ double y = absl::beta_distribution<double>(0.5, 0.5)(urbg);
+ EXPECT_EQ(4, urbg.invocations());
+ EXPECT_EQ(y, 0.9810668952633862) << y;
+ }
+
+ // ...and: log(u) * a ~= log(v) * b ~= -0.02
+ // thus z ~= -0.02 + log(1 + e(~0))
+ // ~= -0.02 + 0.69
+ // thus z > 0
+ urbg.reset();
+ {
+ float x = absl::beta_distribution<float>(0.5, 0.5)(urbg);
+ EXPECT_EQ(4, urbg.invocations());
+ EXPECT_NEAR(0.98106688261032104, x, 0.0000005) << x << "f";
+ }
+ }
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/random/bit_gen_ref.h b/third_party/abseil/src/absl/random/bit_gen_ref.h
new file mode 100644
index 0000000..9555460
--- /dev/null
+++ b/third_party/abseil/src/absl/random/bit_gen_ref.h
@@ -0,0 +1,181 @@
+//
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: bit_gen_ref.h
+// -----------------------------------------------------------------------------
+//
+// This header defines a bit generator "reference" class, for use in interfaces
+// that take both Abseil (e.g. `absl::BitGen`) and standard library (e.g.
+// `std::mt19937`) bit generators.
+
+#ifndef ABSL_RANDOM_BIT_GEN_REF_H_
+#define ABSL_RANDOM_BIT_GEN_REF_H_
+
+#include "absl/base/internal/fast_type_id.h"
+#include "absl/base/macros.h"
+#include "absl/meta/type_traits.h"
+#include "absl/random/internal/distribution_caller.h"
+#include "absl/random/internal/fast_uniform_bits.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace random_internal {
+
+template <typename URBG, typename = void, typename = void, typename = void>
+struct is_urbg : std::false_type {};
+
+template <typename URBG>
+struct is_urbg<
+ URBG,
+ absl::enable_if_t<std::is_same<
+ typename URBG::result_type,
+ typename std::decay<decltype((URBG::min)())>::type>::value>,
+ absl::enable_if_t<std::is_same<
+ typename URBG::result_type,
+ typename std::decay<decltype((URBG::max)())>::type>::value>,
+ absl::enable_if_t<std::is_same<
+ typename URBG::result_type,
+ typename std::decay<decltype(std::declval<URBG>()())>::type>::value>>
+ : std::true_type {};
+
+template <typename>
+struct DistributionCaller;
+class MockHelpers;
+
+} // namespace random_internal
+
+// -----------------------------------------------------------------------------
+// absl::BitGenRef
+// -----------------------------------------------------------------------------
+//
+// `absl::BitGenRef` is a type-erasing class that provides a generator-agnostic
+// non-owning "reference" interface for use in place of any specific uniform
+// random bit generator (URBG). This class may be used for both Abseil
+// (e.g. `absl::BitGen`, `absl::InsecureBitGen`) and Standard library (e.g
+// `std::mt19937`, `std::minstd_rand`) bit generators.
+//
+// Like other reference classes, `absl::BitGenRef` does not own the
+// underlying bit generator, and the underlying instance must outlive the
+// `absl::BitGenRef`.
+//
+// `absl::BitGenRef` is particularly useful when used with an
+// `absl::MockingBitGen` to test specific paths in functions which use random
+// values.
+//
+// Example:
+// void TakesBitGenRef(absl::BitGenRef gen) {
+// int x = absl::Uniform<int>(gen, 0, 1000);
+// }
+//
+class BitGenRef {
+ // SFINAE to detect whether the URBG type includes a member matching
+ // bool InvokeMock(base_internal::FastTypeIdType, void*, void*).
+ //
+ // These live inside BitGenRef so that they have friend access
+ // to MockingBitGen. (see similar methods in DistributionCaller).
+ template <template <class...> class Trait, class AlwaysVoid, class... Args>
+ struct detector : std::false_type {};
+ template <template <class...> class Trait, class... Args>
+ struct detector<Trait, absl::void_t<Trait<Args...>>, Args...>
+ : std::true_type {};
+
+ template <class T>
+ using invoke_mock_t = decltype(std::declval<T*>()->InvokeMock(
+ std::declval<base_internal::FastTypeIdType>(), std::declval<void*>(),
+ std::declval<void*>()));
+
+ template <typename T>
+ using HasInvokeMock = typename detector<invoke_mock_t, void, T>::type;
+
+ public:
+ BitGenRef(const BitGenRef&) = default;
+ BitGenRef(BitGenRef&&) = default;
+ BitGenRef& operator=(const BitGenRef&) = default;
+ BitGenRef& operator=(BitGenRef&&) = default;
+
+ template <typename URBG, typename absl::enable_if_t<
+ (!std::is_same<URBG, BitGenRef>::value &&
+ random_internal::is_urbg<URBG>::value &&
+ !HasInvokeMock<URBG>::value)>* = nullptr>
+ BitGenRef(URBG& gen) // NOLINT
+ : t_erased_gen_ptr_(reinterpret_cast<uintptr_t>(&gen)),
+ mock_call_(NotAMock),
+ generate_impl_fn_(ImplFn<URBG>) {}
+
+ template <typename URBG,
+ typename absl::enable_if_t<(!std::is_same<URBG, BitGenRef>::value &&
+ random_internal::is_urbg<URBG>::value &&
+ HasInvokeMock<URBG>::value)>* = nullptr>
+ BitGenRef(URBG& gen) // NOLINT
+ : t_erased_gen_ptr_(reinterpret_cast<uintptr_t>(&gen)),
+ mock_call_(&MockCall<URBG>),
+ generate_impl_fn_(ImplFn<URBG>) {}
+
+ using result_type = uint64_t;
+
+ static constexpr result_type(min)() {
+ return (std::numeric_limits<result_type>::min)();
+ }
+
+ static constexpr result_type(max)() {
+ return (std::numeric_limits<result_type>::max)();
+ }
+
+ result_type operator()() { return generate_impl_fn_(t_erased_gen_ptr_); }
+
+ private:
+ using impl_fn = result_type (*)(uintptr_t);
+ using mock_call_fn = bool (*)(uintptr_t, base_internal::FastTypeIdType, void*,
+ void*);
+
+ template <typename URBG>
+ static result_type ImplFn(uintptr_t ptr) {
+ // Ensure that the return values from operator() fill the entire
+ // range promised by result_type, min() and max().
+ absl::random_internal::FastUniformBits<result_type> fast_uniform_bits;
+ return fast_uniform_bits(*reinterpret_cast<URBG*>(ptr));
+ }
+
+ // Get a type-erased InvokeMock pointer.
+ template <typename URBG>
+ static bool MockCall(uintptr_t gen_ptr, base_internal::FastTypeIdType type,
+ void* result, void* arg_tuple) {
+ return reinterpret_cast<URBG*>(gen_ptr)->InvokeMock(type, result,
+ arg_tuple);
+ }
+ static bool NotAMock(uintptr_t, base_internal::FastTypeIdType, void*, void*) {
+ return false;
+ }
+
+ inline bool InvokeMock(base_internal::FastTypeIdType type, void* args_tuple,
+ void* result) {
+ if (mock_call_ == NotAMock) return false; // avoids an indirect call.
+ return mock_call_(t_erased_gen_ptr_, type, args_tuple, result);
+ }
+
+ uintptr_t t_erased_gen_ptr_;
+ mock_call_fn mock_call_;
+ impl_fn generate_impl_fn_;
+
+ template <typename>
+ friend struct ::absl::random_internal::DistributionCaller; // for InvokeMock
+ friend class ::absl::random_internal::MockHelpers; // for InvokeMock
+};
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_RANDOM_BIT_GEN_REF_H_
diff --git a/third_party/abseil/src/absl/random/bit_gen_ref_test.cc b/third_party/abseil/src/absl/random/bit_gen_ref_test.cc
new file mode 100644
index 0000000..1135cf2
--- /dev/null
+++ b/third_party/abseil/src/absl/random/bit_gen_ref_test.cc
@@ -0,0 +1,102 @@
+//
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+#include "absl/random/bit_gen_ref.h"
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/base/internal/fast_type_id.h"
+#include "absl/random/internal/sequence_urbg.h"
+#include "absl/random/random.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+class ConstBitGen {
+ public:
+ // URBG interface
+ using result_type = absl::BitGen::result_type;
+
+ static constexpr result_type(min)() { return (absl::BitGen::min)(); }
+ static constexpr result_type(max)() { return (absl::BitGen::max)(); }
+ result_type operator()() { return 1; }
+
+ // InvokeMock method
+ bool InvokeMock(base_internal::FastTypeIdType index, void*, void* result) {
+ *static_cast<int*>(result) = 42;
+ return true;
+ }
+};
+
+namespace {
+
+int FnTest(absl::BitGenRef gen_ref) { return absl::Uniform(gen_ref, 1, 7); }
+
+template <typename T>
+class BitGenRefTest : public testing::Test {};
+
+using BitGenTypes =
+ ::testing::Types<absl::BitGen, absl::InsecureBitGen, std::mt19937,
+ std::mt19937_64, std::minstd_rand>;
+TYPED_TEST_SUITE(BitGenRefTest, BitGenTypes);
+
+TYPED_TEST(BitGenRefTest, BasicTest) {
+ TypeParam gen;
+ auto x = FnTest(gen);
+ EXPECT_NEAR(x, 4, 3);
+}
+
+TYPED_TEST(BitGenRefTest, Copyable) {
+ TypeParam gen;
+ absl::BitGenRef gen_ref(gen);
+ FnTest(gen_ref); // Copy
+}
+
+TEST(BitGenRefTest, PassThroughEquivalence) {
+ // sequence_urbg returns 64-bit results.
+ absl::random_internal::sequence_urbg urbg(
+ {0x0003eb76f6f7f755ull, 0xFFCEA50FDB2F953Bull, 0xC332DDEFBE6C5AA5ull,
+ 0x6558218568AB9702ull, 0x2AEF7DAD5B6E2F84ull, 0x1521B62829076170ull,
+ 0xECDD4775619F1510ull, 0x13CCA830EB61BD96ull, 0x0334FE1EAA0363CFull,
+ 0xB5735C904C70A239ull, 0xD59E9E0BCBAADE14ull, 0xEECC86BC60622CA7ull});
+
+ std::vector<uint64_t> output(12);
+
+ {
+ absl::BitGenRef view(urbg);
+ for (auto& v : output) {
+ v = view();
+ }
+ }
+
+ std::vector<uint64_t> expected(
+ {0x0003eb76f6f7f755ull, 0xFFCEA50FDB2F953Bull, 0xC332DDEFBE6C5AA5ull,
+ 0x6558218568AB9702ull, 0x2AEF7DAD5B6E2F84ull, 0x1521B62829076170ull,
+ 0xECDD4775619F1510ull, 0x13CCA830EB61BD96ull, 0x0334FE1EAA0363CFull,
+ 0xB5735C904C70A239ull, 0xD59E9E0BCBAADE14ull, 0xEECC86BC60622CA7ull});
+
+ EXPECT_THAT(output, testing::Eq(expected));
+}
+
+TEST(BitGenRefTest, MockingBitGenBaseOverrides) {
+ ConstBitGen const_gen;
+ EXPECT_EQ(FnTest(const_gen), 42);
+
+ absl::BitGenRef gen_ref(const_gen);
+ EXPECT_EQ(FnTest(gen_ref), 42); // Copy
+}
+} // namespace
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/random/discrete_distribution.cc b/third_party/abseil/src/absl/random/discrete_distribution.cc
new file mode 100644
index 0000000..081acce
--- /dev/null
+++ b/third_party/abseil/src/absl/random/discrete_distribution.cc
@@ -0,0 +1,98 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/random/discrete_distribution.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace random_internal {
+
+// Initializes the distribution table for Walker's Aliasing algorithm, described
+// in Knuth, Vol 2. as well as in https://en.wikipedia.org/wiki/Alias_method
+std::vector<std::pair<double, size_t>> InitDiscreteDistribution(
+ std::vector<double>* probabilities) {
+ // The empty-case should already be handled by the constructor.
+ assert(probabilities);
+ assert(!probabilities->empty());
+
+ // Step 1. Normalize the input probabilities to 1.0.
+ double sum = std::accumulate(std::begin(*probabilities),
+ std::end(*probabilities), 0.0);
+ if (std::fabs(sum - 1.0) > 1e-6) {
+ // Scale `probabilities` only when the sum is too far from 1.0. Scaling
+ // unconditionally will alter the probabilities slightly.
+ for (double& item : *probabilities) {
+ item = item / sum;
+ }
+ }
+
+ // Step 2. At this point `probabilities` is set to the conditional
+ // probabilities of each element which sum to 1.0, to within reasonable error.
+ // These values are used to construct the proportional probability tables for
+ // the selection phases of Walker's Aliasing algorithm.
+ //
+ // To construct the table, pick an element which is under-full (i.e., an
+ // element for which `(*probabilities)[i] < 1.0/n`), and pair it with an
+ // element which is over-full (i.e., an element for which
+ // `(*probabilities)[i] > 1.0/n`). The smaller value can always be retired.
+ // The larger may still be greater than 1.0/n, or may now be less than 1.0/n,
+ // and put back onto the appropriate collection.
+ const size_t n = probabilities->size();
+ std::vector<std::pair<double, size_t>> q;
+ q.reserve(n);
+
+ std::vector<size_t> over;
+ std::vector<size_t> under;
+ size_t idx = 0;
+ for (const double item : *probabilities) {
+ assert(item >= 0);
+ const double v = item * n;
+ q.emplace_back(v, 0);
+ if (v < 1.0) {
+ under.push_back(idx++);
+ } else {
+ over.push_back(idx++);
+ }
+ }
+ while (!over.empty() && !under.empty()) {
+ auto lo = under.back();
+ under.pop_back();
+ auto hi = over.back();
+ over.pop_back();
+
+ q[lo].second = hi;
+ const double r = q[hi].first - (1.0 - q[lo].first);
+ q[hi].first = r;
+ if (r < 1.0) {
+ under.push_back(hi);
+ } else {
+ over.push_back(hi);
+ }
+ }
+
+ // Due to rounding errors, there may be un-paired elements in either
+ // collection; these should all be values near 1.0. For these values, set `q`
+ // to 1.0 and set the alternate to the identity.
+ for (auto i : over) {
+ q[i] = {1.0, i};
+ }
+ for (auto i : under) {
+ q[i] = {1.0, i};
+ }
+ return q;
+}
+
+} // namespace random_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/random/discrete_distribution.h b/third_party/abseil/src/absl/random/discrete_distribution.h
new file mode 100644
index 0000000..171aa11
--- /dev/null
+++ b/third_party/abseil/src/absl/random/discrete_distribution.h
@@ -0,0 +1,247 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_RANDOM_DISCRETE_DISTRIBUTION_H_
+#define ABSL_RANDOM_DISCRETE_DISTRIBUTION_H_
+
+#include <cassert>
+#include <cmath>
+#include <istream>
+#include <limits>
+#include <numeric>
+#include <type_traits>
+#include <utility>
+#include <vector>
+
+#include "absl/random/bernoulli_distribution.h"
+#include "absl/random/internal/iostream_state_saver.h"
+#include "absl/random/uniform_int_distribution.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+// absl::discrete_distribution
+//
+// A discrete distribution produces random integers i, where 0 <= i < n
+// distributed according to the discrete probability function:
+//
+// P(i|p0,...,pn−1)=pi
+//
+// This class is an implementation of discrete_distribution (see
+// [rand.dist.samp.discrete]).
+//
+// The algorithm used is Walker's Aliasing algorithm, described in Knuth, Vol 2.
+// absl::discrete_distribution takes O(N) time to precompute the probabilities
+// (where N is the number of possible outcomes in the distribution) at
+// construction, and then takes O(1) time for each variate generation. Many
+// other implementations also take O(N) time to construct an ordered sequence of
+// partial sums, plus O(log N) time per variate to binary search.
+//
+template <typename IntType = int>
+class discrete_distribution {
+ public:
+ using result_type = IntType;
+
+ class param_type {
+ public:
+ using distribution_type = discrete_distribution;
+
+ param_type() { init(); }
+
+ template <typename InputIterator>
+ explicit param_type(InputIterator begin, InputIterator end)
+ : p_(begin, end) {
+ init();
+ }
+
+ explicit param_type(std::initializer_list<double> weights) : p_(weights) {
+ init();
+ }
+
+ template <class UnaryOperation>
+ explicit param_type(size_t nw, double xmin, double xmax,
+ UnaryOperation fw) {
+ if (nw > 0) {
+ p_.reserve(nw);
+ double delta = (xmax - xmin) / static_cast<double>(nw);
+ assert(delta > 0);
+ double t = delta * 0.5;
+ for (size_t i = 0; i < nw; ++i) {
+ p_.push_back(fw(xmin + i * delta + t));
+ }
+ }
+ init();
+ }
+
+ const std::vector<double>& probabilities() const { return p_; }
+ size_t n() const { return p_.size() - 1; }
+
+ friend bool operator==(const param_type& a, const param_type& b) {
+ return a.probabilities() == b.probabilities();
+ }
+
+ friend bool operator!=(const param_type& a, const param_type& b) {
+ return !(a == b);
+ }
+
+ private:
+ friend class discrete_distribution;
+
+ void init();
+
+ std::vector<double> p_; // normalized probabilities
+ std::vector<std::pair<double, size_t>> q_; // (acceptance, alternate) pairs
+
+ static_assert(std::is_integral<result_type>::value,
+ "Class-template absl::discrete_distribution<> must be "
+ "parameterized using an integral type.");
+ };
+
+ discrete_distribution() : param_() {}
+
+ explicit discrete_distribution(const param_type& p) : param_(p) {}
+
+ template <typename InputIterator>
+ explicit discrete_distribution(InputIterator begin, InputIterator end)
+ : param_(begin, end) {}
+
+ explicit discrete_distribution(std::initializer_list<double> weights)
+ : param_(weights) {}
+
+ template <class UnaryOperation>
+ explicit discrete_distribution(size_t nw, double xmin, double xmax,
+ UnaryOperation fw)
+ : param_(nw, xmin, xmax, std::move(fw)) {}
+
+ void reset() {}
+
+ // generating functions
+ template <typename URBG>
+ result_type operator()(URBG& g) { // NOLINT(runtime/references)
+ return (*this)(g, param_);
+ }
+
+ template <typename URBG>
+ result_type operator()(URBG& g, // NOLINT(runtime/references)
+ const param_type& p);
+
+ const param_type& param() const { return param_; }
+ void param(const param_type& p) { param_ = p; }
+
+ result_type(min)() const { return 0; }
+ result_type(max)() const {
+ return static_cast<result_type>(param_.n());
+ } // inclusive
+
+ // NOTE [rand.dist.sample.discrete] returns a std::vector<double> not a
+ // const std::vector<double>&.
+ const std::vector<double>& probabilities() const {
+ return param_.probabilities();
+ }
+
+ friend bool operator==(const discrete_distribution& a,
+ const discrete_distribution& b) {
+ return a.param_ == b.param_;
+ }
+ friend bool operator!=(const discrete_distribution& a,
+ const discrete_distribution& b) {
+ return a.param_ != b.param_;
+ }
+
+ private:
+ param_type param_;
+};
+
+// --------------------------------------------------------------------------
+// Implementation details only below
+// --------------------------------------------------------------------------
+
+namespace random_internal {
+
+// Using the vector `*probabilities`, whose values are the weights or
+// probabilities of an element being selected, constructs the proportional
+// probabilities used by the discrete distribution. `*probabilities` will be
+// scaled, if necessary, so that its entries sum to a value sufficiently close
+// to 1.0.
+std::vector<std::pair<double, size_t>> InitDiscreteDistribution(
+ std::vector<double>* probabilities);
+
+} // namespace random_internal
+
+template <typename IntType>
+void discrete_distribution<IntType>::param_type::init() {
+ if (p_.empty()) {
+ p_.push_back(1.0);
+ q_.emplace_back(1.0, 0);
+ } else {
+ assert(n() <= (std::numeric_limits<IntType>::max)());
+ q_ = random_internal::InitDiscreteDistribution(&p_);
+ }
+}
+
+template <typename IntType>
+template <typename URBG>
+typename discrete_distribution<IntType>::result_type
+discrete_distribution<IntType>::operator()(
+ URBG& g, // NOLINT(runtime/references)
+ const param_type& p) {
+ const auto idx = absl::uniform_int_distribution<result_type>(0, p.n())(g);
+ const auto& q = p.q_[idx];
+ const bool selected = absl::bernoulli_distribution(q.first)(g);
+ return selected ? idx : static_cast<result_type>(q.second);
+}
+
+template <typename CharT, typename Traits, typename IntType>
+std::basic_ostream<CharT, Traits>& operator<<(
+ std::basic_ostream<CharT, Traits>& os, // NOLINT(runtime/references)
+ const discrete_distribution<IntType>& x) {
+ auto saver = random_internal::make_ostream_state_saver(os);
+ const auto& probabilities = x.param().probabilities();
+ os << probabilities.size();
+
+ os.precision(random_internal::stream_precision_helper<double>::kPrecision);
+ for (const auto& p : probabilities) {
+ os << os.fill() << p;
+ }
+ return os;
+}
+
+template <typename CharT, typename Traits, typename IntType>
+std::basic_istream<CharT, Traits>& operator>>(
+ std::basic_istream<CharT, Traits>& is, // NOLINT(runtime/references)
+ discrete_distribution<IntType>& x) { // NOLINT(runtime/references)
+ using param_type = typename discrete_distribution<IntType>::param_type;
+ auto saver = random_internal::make_istream_state_saver(is);
+
+ size_t n;
+ std::vector<double> p;
+
+ is >> n;
+ if (is.fail()) return is;
+ if (n > 0) {
+ p.reserve(n);
+ for (IntType i = 0; i < n && !is.fail(); ++i) {
+ auto tmp = random_internal::read_floating_point<double>(is);
+ if (is.fail()) return is;
+ p.push_back(tmp);
+ }
+ }
+ x.param(param_type(p.begin(), p.end()));
+ return is;
+}
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_RANDOM_DISCRETE_DISTRIBUTION_H_
diff --git a/third_party/abseil/src/absl/random/discrete_distribution_test.cc b/third_party/abseil/src/absl/random/discrete_distribution_test.cc
new file mode 100644
index 0000000..6d00700
--- /dev/null
+++ b/third_party/abseil/src/absl/random/discrete_distribution_test.cc
@@ -0,0 +1,250 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/random/discrete_distribution.h"
+
+#include <cmath>
+#include <cstddef>
+#include <cstdint>
+#include <iterator>
+#include <numeric>
+#include <random>
+#include <sstream>
+#include <string>
+#include <vector>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/base/internal/raw_logging.h"
+#include "absl/random/internal/chi_square.h"
+#include "absl/random/internal/distribution_test_util.h"
+#include "absl/random/internal/pcg_engine.h"
+#include "absl/random/internal/sequence_urbg.h"
+#include "absl/random/random.h"
+#include "absl/strings/str_cat.h"
+#include "absl/strings/strip.h"
+
+namespace {
+
+template <typename IntType>
+class DiscreteDistributionTypeTest : public ::testing::Test {};
+
+using IntTypes = ::testing::Types<int8_t, uint8_t, int16_t, uint16_t, int32_t,
+ uint32_t, int64_t, uint64_t>;
+TYPED_TEST_SUITE(DiscreteDistributionTypeTest, IntTypes);
+
+TYPED_TEST(DiscreteDistributionTypeTest, ParamSerializeTest) {
+ using param_type =
+ typename absl::discrete_distribution<TypeParam>::param_type;
+
+ absl::discrete_distribution<TypeParam> empty;
+ EXPECT_THAT(empty.probabilities(), testing::ElementsAre(1.0));
+
+ absl::discrete_distribution<TypeParam> before({1.0, 2.0, 1.0});
+
+ // Validate that the probabilities sum to 1.0. We picked values which
+ // can be represented exactly to avoid floating-point roundoff error.
+ double s = 0;
+ for (const auto& x : before.probabilities()) {
+ s += x;
+ }
+ EXPECT_EQ(s, 1.0);
+ EXPECT_THAT(before.probabilities(), testing::ElementsAre(0.25, 0.5, 0.25));
+
+ // Validate the same data via an initializer list.
+ {
+ std::vector<double> data({1.0, 2.0, 1.0});
+
+ absl::discrete_distribution<TypeParam> via_param{
+ param_type(std::begin(data), std::end(data))};
+
+ EXPECT_EQ(via_param, before);
+ }
+
+ std::stringstream ss;
+ ss << before;
+ absl::discrete_distribution<TypeParam> after;
+
+ EXPECT_NE(before, after);
+
+ ss >> after;
+
+ EXPECT_EQ(before, after);
+}
+
+TYPED_TEST(DiscreteDistributionTypeTest, Constructor) {
+ auto fn = [](double x) { return x; };
+ {
+ absl::discrete_distribution<int> unary(0, 1.0, 9.0, fn);
+ EXPECT_THAT(unary.probabilities(), testing::ElementsAre(1.0));
+ }
+
+ {
+ absl::discrete_distribution<int> unary(2, 1.0, 9.0, fn);
+ // => fn(1.0 + 0 * 4 + 2) => 3
+ // => fn(1.0 + 1 * 4 + 2) => 7
+ EXPECT_THAT(unary.probabilities(), testing::ElementsAre(0.3, 0.7));
+ }
+}
+
+TEST(DiscreteDistributionTest, InitDiscreteDistribution) {
+ using testing::Pair;
+
+ {
+ std::vector<double> p({1.0, 2.0, 3.0});
+ std::vector<std::pair<double, size_t>> q =
+ absl::random_internal::InitDiscreteDistribution(&p);
+
+ EXPECT_THAT(p, testing::ElementsAre(1 / 6.0, 2 / 6.0, 3 / 6.0));
+
+ // Each bucket is p=1/3, so bucket 0 will send half it's traffic
+ // to bucket 2, while the rest will retain all of their traffic.
+ EXPECT_THAT(q, testing::ElementsAre(Pair(0.5, 2), //
+ Pair(1.0, 1), //
+ Pair(1.0, 2)));
+ }
+
+ {
+ std::vector<double> p({1.0, 2.0, 3.0, 5.0, 2.0});
+
+ std::vector<std::pair<double, size_t>> q =
+ absl::random_internal::InitDiscreteDistribution(&p);
+
+ EXPECT_THAT(p, testing::ElementsAre(1 / 13.0, 2 / 13.0, 3 / 13.0, 5 / 13.0,
+ 2 / 13.0));
+
+ // A more complex bucketing solution: Each bucket has p=0.2
+ // So buckets 0, 1, 4 will send their alternate traffic elsewhere, which
+ // happens to be bucket 3.
+ // However, summing up that alternate traffic gives bucket 3 too much
+ // traffic, so it will send some traffic to bucket 2.
+ constexpr double b0 = 1.0 / 13.0 / 0.2;
+ constexpr double b1 = 2.0 / 13.0 / 0.2;
+ constexpr double b3 = (5.0 / 13.0 / 0.2) - ((1 - b0) + (1 - b1) + (1 - b1));
+
+ EXPECT_THAT(q, testing::ElementsAre(Pair(b0, 3), //
+ Pair(b1, 3), //
+ Pair(1.0, 2), //
+ Pair(b3, 2), //
+ Pair(b1, 3)));
+ }
+}
+
+TEST(DiscreteDistributionTest, ChiSquaredTest50) {
+ using absl::random_internal::kChiSquared;
+
+ constexpr size_t kTrials = 10000;
+ constexpr int kBuckets = 50; // inclusive, so actally +1
+
+ // 1-in-100000 threshold, but remember, there are about 8 tests
+ // in this file. And the test could fail for other reasons.
+ // Empirically validated with --runs_per_test=10000.
+ const int kThreshold =
+ absl::random_internal::ChiSquareValue(kBuckets, 0.99999);
+
+ std::vector<double> weights(kBuckets, 0);
+ std::iota(std::begin(weights), std::end(weights), 1);
+ absl::discrete_distribution<int> dist(std::begin(weights), std::end(weights));
+
+ // We use a fixed bit generator for distribution accuracy tests. This allows
+ // these tests to be deterministic, while still testing the qualify of the
+ // implementation.
+ absl::random_internal::pcg64_2018_engine rng(0x2B7E151628AED2A6);
+
+ std::vector<int32_t> counts(kBuckets, 0);
+ for (size_t i = 0; i < kTrials; i++) {
+ auto x = dist(rng);
+ counts[x]++;
+ }
+
+ // Scale weights.
+ double sum = 0;
+ for (double x : weights) {
+ sum += x;
+ }
+ for (double& x : weights) {
+ x = kTrials * (x / sum);
+ }
+
+ double chi_square =
+ absl::random_internal::ChiSquare(std::begin(counts), std::end(counts),
+ std::begin(weights), std::end(weights));
+
+ if (chi_square > kThreshold) {
+ double p_value =
+ absl::random_internal::ChiSquarePValue(chi_square, kBuckets);
+
+ // Chi-squared test failed. Output does not appear to be uniform.
+ std::string msg;
+ for (size_t i = 0; i < counts.size(); i++) {
+ absl::StrAppend(&msg, i, ": ", counts[i], " vs ", weights[i], "\n");
+ }
+ absl::StrAppend(&msg, kChiSquared, " p-value ", p_value, "\n");
+ absl::StrAppend(&msg, "High ", kChiSquared, " value: ", chi_square, " > ",
+ kThreshold);
+ ABSL_RAW_LOG(INFO, "%s", msg.c_str());
+ FAIL() << msg;
+ }
+}
+
+TEST(DiscreteDistributionTest, StabilityTest) {
+ // absl::discrete_distribution stabilitiy relies on
+ // absl::uniform_int_distribution and absl::bernoulli_distribution.
+ absl::random_internal::sequence_urbg urbg(
+ {0x0003eb76f6f7f755ull, 0xFFCEA50FDB2F953Bull, 0xC332DDEFBE6C5AA5ull,
+ 0x6558218568AB9702ull, 0x2AEF7DAD5B6E2F84ull, 0x1521B62829076170ull,
+ 0xECDD4775619F1510ull, 0x13CCA830EB61BD96ull, 0x0334FE1EAA0363CFull,
+ 0xB5735C904C70A239ull, 0xD59E9E0BCBAADE14ull, 0xEECC86BC60622CA7ull});
+
+ std::vector<int> output(6);
+
+ {
+ absl::discrete_distribution<int32_t> dist({1.0, 2.0, 3.0, 5.0, 2.0});
+ EXPECT_EQ(0, dist.min());
+ EXPECT_EQ(4, dist.max());
+ for (auto& v : output) {
+ v = dist(urbg);
+ }
+ EXPECT_EQ(12, urbg.invocations());
+ }
+
+ // With 12 calls to urbg, each call into discrete_distribution consumes
+ // precisely 2 values: one for the uniform call, and a second for the
+ // bernoulli.
+ //
+ // Given the alt mapping: 0=>3, 1=>3, 2=>2, 3=>2, 4=>3, we can
+ //
+ // uniform: 443210143131
+ // bernoulli: b0 000011100101
+ // bernoulli: b1 001111101101
+ // bernoulli: b2 111111111111
+ // bernoulli: b3 001111101111
+ // bernoulli: b4 001111101101
+ // ...
+ EXPECT_THAT(output, testing::ElementsAre(3, 3, 1, 3, 3, 3));
+
+ {
+ urbg.reset();
+ absl::discrete_distribution<int64_t> dist({1.0, 2.0, 3.0, 5.0, 2.0});
+ EXPECT_EQ(0, dist.min());
+ EXPECT_EQ(4, dist.max());
+ for (auto& v : output) {
+ v = dist(urbg);
+ }
+ EXPECT_EQ(12, urbg.invocations());
+ }
+ EXPECT_THAT(output, testing::ElementsAre(3, 3, 0, 3, 0, 4));
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/random/distributions.h b/third_party/abseil/src/absl/random/distributions.h
new file mode 100644
index 0000000..31c7969
--- /dev/null
+++ b/third_party/abseil/src/absl/random/distributions.h
@@ -0,0 +1,452 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: distributions.h
+// -----------------------------------------------------------------------------
+//
+// This header defines functions representing distributions, which you use in
+// combination with an Abseil random bit generator to produce random values
+// according to the rules of that distribution.
+//
+// The Abseil random library defines the following distributions within this
+// file:
+//
+// * `absl::Uniform` for uniform (constant) distributions having constant
+// probability
+// * `absl::Bernoulli` for discrete distributions having exactly two outcomes
+// * `absl::Beta` for continuous distributions parameterized through two
+// free parameters
+// * `absl::Exponential` for discrete distributions of events occurring
+// continuously and independently at a constant average rate
+// * `absl::Gaussian` (also known as "normal distributions") for continuous
+// distributions using an associated quadratic function
+// * `absl::LogUniform` for continuous uniform distributions where the log
+// to the given base of all values is uniform
+// * `absl::Poisson` for discrete probability distributions that express the
+// probability of a given number of events occurring within a fixed interval
+// * `absl::Zipf` for discrete probability distributions commonly used for
+// modelling of rare events
+//
+// Prefer use of these distribution function classes over manual construction of
+// your own distribution classes, as it allows library maintainers greater
+// flexibility to change the underlying implementation in the future.
+
+#ifndef ABSL_RANDOM_DISTRIBUTIONS_H_
+#define ABSL_RANDOM_DISTRIBUTIONS_H_
+
+#include <algorithm>
+#include <cmath>
+#include <limits>
+#include <random>
+#include <type_traits>
+
+#include "absl/base/internal/inline_variable.h"
+#include "absl/random/bernoulli_distribution.h"
+#include "absl/random/beta_distribution.h"
+#include "absl/random/exponential_distribution.h"
+#include "absl/random/gaussian_distribution.h"
+#include "absl/random/internal/distribution_caller.h" // IWYU pragma: export
+#include "absl/random/internal/uniform_helper.h" // IWYU pragma: export
+#include "absl/random/log_uniform_int_distribution.h"
+#include "absl/random/poisson_distribution.h"
+#include "absl/random/uniform_int_distribution.h"
+#include "absl/random/uniform_real_distribution.h"
+#include "absl/random/zipf_distribution.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+ABSL_INTERNAL_INLINE_CONSTEXPR(IntervalClosedClosedTag, IntervalClosedClosed,
+ {});
+ABSL_INTERNAL_INLINE_CONSTEXPR(IntervalClosedClosedTag, IntervalClosed, {});
+ABSL_INTERNAL_INLINE_CONSTEXPR(IntervalClosedOpenTag, IntervalClosedOpen, {});
+ABSL_INTERNAL_INLINE_CONSTEXPR(IntervalOpenOpenTag, IntervalOpenOpen, {});
+ABSL_INTERNAL_INLINE_CONSTEXPR(IntervalOpenOpenTag, IntervalOpen, {});
+ABSL_INTERNAL_INLINE_CONSTEXPR(IntervalOpenClosedTag, IntervalOpenClosed, {});
+
+// -----------------------------------------------------------------------------
+// absl::Uniform<T>(tag, bitgen, lo, hi)
+// -----------------------------------------------------------------------------
+//
+// `absl::Uniform()` produces random values of type `T` uniformly distributed in
+// a defined interval {lo, hi}. The interval `tag` defines the type of interval
+// which should be one of the following possible values:
+//
+// * `absl::IntervalOpenOpen`
+// * `absl::IntervalOpenClosed`
+// * `absl::IntervalClosedOpen`
+// * `absl::IntervalClosedClosed`
+//
+// where "open" refers to an exclusive value (excluded) from the output, while
+// "closed" refers to an inclusive value (included) from the output.
+//
+// In the absence of an explicit return type `T`, `absl::Uniform()` will deduce
+// the return type based on the provided endpoint arguments {A lo, B hi}.
+// Given these endpoints, one of {A, B} will be chosen as the return type, if
+// a type can be implicitly converted into the other in a lossless way. The
+// lack of any such implicit conversion between {A, B} will produce a
+// compile-time error
+//
+// See https://en.wikipedia.org/wiki/Uniform_distribution_(continuous)
+//
+// Example:
+//
+// absl::BitGen bitgen;
+//
+// // Produce a random float value between 0.0 and 1.0, inclusive
+// auto x = absl::Uniform(absl::IntervalClosedClosed, bitgen, 0.0f, 1.0f);
+//
+// // The most common interval of `absl::IntervalClosedOpen` is available by
+// // default:
+//
+// auto x = absl::Uniform(bitgen, 0.0f, 1.0f);
+//
+// // Return-types are typically inferred from the arguments, however callers
+// // can optionally provide an explicit return-type to the template.
+//
+// auto x = absl::Uniform<float>(bitgen, 0, 1);
+//
+template <typename R = void, typename TagType, typename URBG>
+typename absl::enable_if_t<!std::is_same<R, void>::value, R> //
+Uniform(TagType tag,
+ URBG&& urbg, // NOLINT(runtime/references)
+ R lo, R hi) {
+ using gen_t = absl::decay_t<URBG>;
+ using distribution_t = random_internal::UniformDistributionWrapper<R>;
+
+ auto a = random_internal::uniform_lower_bound(tag, lo, hi);
+ auto b = random_internal::uniform_upper_bound(tag, lo, hi);
+ if (!random_internal::is_uniform_range_valid(a, b)) return lo;
+
+ return random_internal::DistributionCaller<gen_t>::template Call<
+ distribution_t>(&urbg, tag, lo, hi);
+}
+
+// absl::Uniform<T>(bitgen, lo, hi)
+//
+// Overload of `Uniform()` using the default closed-open interval of [lo, hi),
+// and returning values of type `T`
+template <typename R = void, typename URBG>
+typename absl::enable_if_t<!std::is_same<R, void>::value, R> //
+Uniform(URBG&& urbg, // NOLINT(runtime/references)
+ R lo, R hi) {
+ using gen_t = absl::decay_t<URBG>;
+ using distribution_t = random_internal::UniformDistributionWrapper<R>;
+ constexpr auto tag = absl::IntervalClosedOpen;
+
+ auto a = random_internal::uniform_lower_bound(tag, lo, hi);
+ auto b = random_internal::uniform_upper_bound(tag, lo, hi);
+ if (!random_internal::is_uniform_range_valid(a, b)) return lo;
+
+ return random_internal::DistributionCaller<gen_t>::template Call<
+ distribution_t>(&urbg, lo, hi);
+}
+
+// absl::Uniform(tag, bitgen, lo, hi)
+//
+// Overload of `Uniform()` using different (but compatible) lo, hi types. Note
+// that a compile-error will result if the return type cannot be deduced
+// correctly from the passed types.
+template <typename R = void, typename TagType, typename URBG, typename A,
+ typename B>
+typename absl::enable_if_t<std::is_same<R, void>::value,
+ random_internal::uniform_inferred_return_t<A, B>>
+Uniform(TagType tag,
+ URBG&& urbg, // NOLINT(runtime/references)
+ A lo, B hi) {
+ using gen_t = absl::decay_t<URBG>;
+ using return_t = typename random_internal::uniform_inferred_return_t<A, B>;
+ using distribution_t = random_internal::UniformDistributionWrapper<return_t>;
+
+ auto a = random_internal::uniform_lower_bound<return_t>(tag, lo, hi);
+ auto b = random_internal::uniform_upper_bound<return_t>(tag, lo, hi);
+ if (!random_internal::is_uniform_range_valid(a, b)) return lo;
+
+ return random_internal::DistributionCaller<gen_t>::template Call<
+ distribution_t>(&urbg, tag, static_cast<return_t>(lo),
+ static_cast<return_t>(hi));
+}
+
+// absl::Uniform(bitgen, lo, hi)
+//
+// Overload of `Uniform()` using different (but compatible) lo, hi types and the
+// default closed-open interval of [lo, hi). Note that a compile-error will
+// result if the return type cannot be deduced correctly from the passed types.
+template <typename R = void, typename URBG, typename A, typename B>
+typename absl::enable_if_t<std::is_same<R, void>::value,
+ random_internal::uniform_inferred_return_t<A, B>>
+Uniform(URBG&& urbg, // NOLINT(runtime/references)
+ A lo, B hi) {
+ using gen_t = absl::decay_t<URBG>;
+ using return_t = typename random_internal::uniform_inferred_return_t<A, B>;
+ using distribution_t = random_internal::UniformDistributionWrapper<return_t>;
+
+ constexpr auto tag = absl::IntervalClosedOpen;
+ auto a = random_internal::uniform_lower_bound<return_t>(tag, lo, hi);
+ auto b = random_internal::uniform_upper_bound<return_t>(tag, lo, hi);
+ if (!random_internal::is_uniform_range_valid(a, b)) return lo;
+
+ return random_internal::DistributionCaller<gen_t>::template Call<
+ distribution_t>(&urbg, static_cast<return_t>(lo),
+ static_cast<return_t>(hi));
+}
+
+// absl::Uniform<unsigned T>(bitgen)
+//
+// Overload of Uniform() using the minimum and maximum values of a given type
+// `T` (which must be unsigned), returning a value of type `unsigned T`
+template <typename R, typename URBG>
+typename absl::enable_if_t<!std::is_signed<R>::value, R> //
+Uniform(URBG&& urbg) { // NOLINT(runtime/references)
+ using gen_t = absl::decay_t<URBG>;
+ using distribution_t = random_internal::UniformDistributionWrapper<R>;
+
+ return random_internal::DistributionCaller<gen_t>::template Call<
+ distribution_t>(&urbg);
+}
+
+// -----------------------------------------------------------------------------
+// absl::Bernoulli(bitgen, p)
+// -----------------------------------------------------------------------------
+//
+// `absl::Bernoulli` produces a random boolean value, with probability `p`
+// (where 0.0 <= p <= 1.0) equaling `true`.
+//
+// Prefer `absl::Bernoulli` to produce boolean values over other alternatives
+// such as comparing an `absl::Uniform()` value to a specific output.
+//
+// See https://en.wikipedia.org/wiki/Bernoulli_distribution
+//
+// Example:
+//
+// absl::BitGen bitgen;
+// ...
+// if (absl::Bernoulli(bitgen, 1.0/3721.0)) {
+// std::cout << "Asteroid field navigation successful.";
+// }
+//
+template <typename URBG>
+bool Bernoulli(URBG&& urbg, // NOLINT(runtime/references)
+ double p) {
+ using gen_t = absl::decay_t<URBG>;
+ using distribution_t = absl::bernoulli_distribution;
+
+ return random_internal::DistributionCaller<gen_t>::template Call<
+ distribution_t>(&urbg, p);
+}
+
+// -----------------------------------------------------------------------------
+// absl::Beta<T>(bitgen, alpha, beta)
+// -----------------------------------------------------------------------------
+//
+// `absl::Beta` produces a floating point number distributed in the closed
+// interval [0,1] and parameterized by two values `alpha` and `beta` as per a
+// Beta distribution. `T` must be a floating point type, but may be inferred
+// from the types of `alpha` and `beta`.
+//
+// See https://en.wikipedia.org/wiki/Beta_distribution.
+//
+// Example:
+//
+// absl::BitGen bitgen;
+// ...
+// double sample = absl::Beta(bitgen, 3.0, 2.0);
+//
+template <typename RealType, typename URBG>
+RealType Beta(URBG&& urbg, // NOLINT(runtime/references)
+ RealType alpha, RealType beta) {
+ static_assert(
+ std::is_floating_point<RealType>::value,
+ "Template-argument 'RealType' must be a floating-point type, in "
+ "absl::Beta<RealType, URBG>(...)");
+
+ using gen_t = absl::decay_t<URBG>;
+ using distribution_t = typename absl::beta_distribution<RealType>;
+
+ return random_internal::DistributionCaller<gen_t>::template Call<
+ distribution_t>(&urbg, alpha, beta);
+}
+
+// -----------------------------------------------------------------------------
+// absl::Exponential<T>(bitgen, lambda = 1)
+// -----------------------------------------------------------------------------
+//
+// `absl::Exponential` produces a floating point number representing the
+// distance (time) between two consecutive events in a point process of events
+// occurring continuously and independently at a constant average rate. `T` must
+// be a floating point type, but may be inferred from the type of `lambda`.
+//
+// See https://en.wikipedia.org/wiki/Exponential_distribution.
+//
+// Example:
+//
+// absl::BitGen bitgen;
+// ...
+// double call_length = absl::Exponential(bitgen, 7.0);
+//
+template <typename RealType, typename URBG>
+RealType Exponential(URBG&& urbg, // NOLINT(runtime/references)
+ RealType lambda = 1) {
+ static_assert(
+ std::is_floating_point<RealType>::value,
+ "Template-argument 'RealType' must be a floating-point type, in "
+ "absl::Exponential<RealType, URBG>(...)");
+
+ using gen_t = absl::decay_t<URBG>;
+ using distribution_t = typename absl::exponential_distribution<RealType>;
+
+ return random_internal::DistributionCaller<gen_t>::template Call<
+ distribution_t>(&urbg, lambda);
+}
+
+// -----------------------------------------------------------------------------
+// absl::Gaussian<T>(bitgen, mean = 0, stddev = 1)
+// -----------------------------------------------------------------------------
+//
+// `absl::Gaussian` produces a floating point number selected from the Gaussian
+// (ie. "Normal") distribution. `T` must be a floating point type, but may be
+// inferred from the types of `mean` and `stddev`.
+//
+// See https://en.wikipedia.org/wiki/Normal_distribution
+//
+// Example:
+//
+// absl::BitGen bitgen;
+// ...
+// double giraffe_height = absl::Gaussian(bitgen, 16.3, 3.3);
+//
+template <typename RealType, typename URBG>
+RealType Gaussian(URBG&& urbg, // NOLINT(runtime/references)
+ RealType mean = 0, RealType stddev = 1) {
+ static_assert(
+ std::is_floating_point<RealType>::value,
+ "Template-argument 'RealType' must be a floating-point type, in "
+ "absl::Gaussian<RealType, URBG>(...)");
+
+ using gen_t = absl::decay_t<URBG>;
+ using distribution_t = typename absl::gaussian_distribution<RealType>;
+
+ return random_internal::DistributionCaller<gen_t>::template Call<
+ distribution_t>(&urbg, mean, stddev);
+}
+
+// -----------------------------------------------------------------------------
+// absl::LogUniform<T>(bitgen, lo, hi, base = 2)
+// -----------------------------------------------------------------------------
+//
+// `absl::LogUniform` produces random values distributed where the log to a
+// given base of all values is uniform in a closed interval [lo, hi]. `T` must
+// be an integral type, but may be inferred from the types of `lo` and `hi`.
+//
+// I.e., `LogUniform(0, n, b)` is uniformly distributed across buckets
+// [0], [1, b-1], [b, b^2-1] .. [b^(k-1), (b^k)-1] .. [b^floor(log(n, b)), n]
+// and is uniformly distributed within each bucket.
+//
+// The resulting probability density is inversely related to bucket size, though
+// values in the final bucket may be more likely than previous values. (In the
+// extreme case where n = b^i the final value will be tied with zero as the most
+// probable result.
+//
+// If `lo` is nonzero then this distribution is shifted to the desired interval,
+// so LogUniform(lo, hi, b) is equivalent to LogUniform(0, hi-lo, b)+lo.
+//
+// See http://ecolego.facilia.se/ecolego/show/Log-Uniform%20Distribution
+//
+// Example:
+//
+// absl::BitGen bitgen;
+// ...
+// int v = absl::LogUniform(bitgen, 0, 1000);
+//
+template <typename IntType, typename URBG>
+IntType LogUniform(URBG&& urbg, // NOLINT(runtime/references)
+ IntType lo, IntType hi, IntType base = 2) {
+ static_assert(std::is_integral<IntType>::value,
+ "Template-argument 'IntType' must be an integral type, in "
+ "absl::LogUniform<IntType, URBG>(...)");
+
+ using gen_t = absl::decay_t<URBG>;
+ using distribution_t = typename absl::log_uniform_int_distribution<IntType>;
+
+ return random_internal::DistributionCaller<gen_t>::template Call<
+ distribution_t>(&urbg, lo, hi, base);
+}
+
+// -----------------------------------------------------------------------------
+// absl::Poisson<T>(bitgen, mean = 1)
+// -----------------------------------------------------------------------------
+//
+// `absl::Poisson` produces discrete probabilities for a given number of events
+// occurring within a fixed interval within the closed interval [0, max]. `T`
+// must be an integral type.
+//
+// See https://en.wikipedia.org/wiki/Poisson_distribution
+//
+// Example:
+//
+// absl::BitGen bitgen;
+// ...
+// int requests_per_minute = absl::Poisson<int>(bitgen, 3.2);
+//
+template <typename IntType, typename URBG>
+IntType Poisson(URBG&& urbg, // NOLINT(runtime/references)
+ double mean = 1.0) {
+ static_assert(std::is_integral<IntType>::value,
+ "Template-argument 'IntType' must be an integral type, in "
+ "absl::Poisson<IntType, URBG>(...)");
+
+ using gen_t = absl::decay_t<URBG>;
+ using distribution_t = typename absl::poisson_distribution<IntType>;
+
+ return random_internal::DistributionCaller<gen_t>::template Call<
+ distribution_t>(&urbg, mean);
+}
+
+// -----------------------------------------------------------------------------
+// absl::Zipf<T>(bitgen, hi = max, q = 2, v = 1)
+// -----------------------------------------------------------------------------
+//
+// `absl::Zipf` produces discrete probabilities commonly used for modelling of
+// rare events over the closed interval [0, hi]. The parameters `v` and `q`
+// determine the skew of the distribution. `T` must be an integral type, but
+// may be inferred from the type of `hi`.
+//
+// See http://mathworld.wolfram.com/ZipfDistribution.html
+//
+// Example:
+//
+// absl::BitGen bitgen;
+// ...
+// int term_rank = absl::Zipf<int>(bitgen);
+//
+template <typename IntType, typename URBG>
+IntType Zipf(URBG&& urbg, // NOLINT(runtime/references)
+ IntType hi = (std::numeric_limits<IntType>::max)(), double q = 2.0,
+ double v = 1.0) {
+ static_assert(std::is_integral<IntType>::value,
+ "Template-argument 'IntType' must be an integral type, in "
+ "absl::Zipf<IntType, URBG>(...)");
+
+ using gen_t = absl::decay_t<URBG>;
+ using distribution_t = typename absl::zipf_distribution<IntType>;
+
+ return random_internal::DistributionCaller<gen_t>::template Call<
+ distribution_t>(&urbg, hi, q, v);
+}
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_RANDOM_DISTRIBUTIONS_H_
diff --git a/third_party/abseil/src/absl/random/distributions_test.cc b/third_party/abseil/src/absl/random/distributions_test.cc
new file mode 100644
index 0000000..5866a07
--- /dev/null
+++ b/third_party/abseil/src/absl/random/distributions_test.cc
@@ -0,0 +1,455 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/random/distributions.h"
+
+#include <cmath>
+#include <cstdint>
+#include <random>
+#include <vector>
+
+#include "gtest/gtest.h"
+#include "absl/random/internal/distribution_test_util.h"
+#include "absl/random/random.h"
+
+namespace {
+
+constexpr int kSize = 400000;
+
+class RandomDistributionsTest : public testing::Test {};
+
+
+struct Invalid {};
+
+template <typename A, typename B>
+auto InferredUniformReturnT(int)
+ -> decltype(absl::Uniform(std::declval<absl::InsecureBitGen&>(),
+ std::declval<A>(), std::declval<B>()));
+
+template <typename, typename>
+Invalid InferredUniformReturnT(...);
+
+template <typename TagType, typename A, typename B>
+auto InferredTaggedUniformReturnT(int)
+ -> decltype(absl::Uniform(std::declval<TagType>(),
+ std::declval<absl::InsecureBitGen&>(),
+ std::declval<A>(), std::declval<B>()));
+
+template <typename, typename, typename>
+Invalid InferredTaggedUniformReturnT(...);
+
+// Given types <A, B, Expect>, CheckArgsInferType() verifies that
+//
+// absl::Uniform(gen, A{}, B{})
+//
+// returns the type "Expect".
+//
+// This interface can also be used to assert that a given absl::Uniform()
+// overload does not exist / will not compile. Given types <A, B>, the
+// expression
+//
+// decltype(absl::Uniform(..., std::declval<A>(), std::declval<B>()))
+//
+// will not compile, leaving the definition of InferredUniformReturnT<A, B> to
+// resolve (via SFINAE) to the overload which returns type "Invalid". This
+// allows tests to assert that an invocation such as
+//
+// absl::Uniform(gen, 1.23f, std::numeric_limits<int>::max() - 1)
+//
+// should not compile, since neither type, float nor int, can precisely
+// represent both endpoint-values. Writing:
+//
+// CheckArgsInferType<float, int, Invalid>()
+//
+// will assert that this overload does not exist.
+template <typename A, typename B, typename Expect>
+void CheckArgsInferType() {
+ static_assert(
+ absl::conjunction<
+ std::is_same<Expect, decltype(InferredUniformReturnT<A, B>(0))>,
+ std::is_same<Expect,
+ decltype(InferredUniformReturnT<B, A>(0))>>::value,
+ "");
+ static_assert(
+ absl::conjunction<
+ std::is_same<Expect, decltype(InferredTaggedUniformReturnT<
+ absl::IntervalOpenOpenTag, A, B>(0))>,
+ std::is_same<Expect,
+ decltype(InferredTaggedUniformReturnT<
+ absl::IntervalOpenOpenTag, B, A>(0))>>::value,
+ "");
+}
+
+template <typename A, typename B, typename ExplicitRet>
+auto ExplicitUniformReturnT(int) -> decltype(
+ absl::Uniform<ExplicitRet>(*std::declval<absl::InsecureBitGen*>(),
+ std::declval<A>(), std::declval<B>()));
+
+template <typename, typename, typename ExplicitRet>
+Invalid ExplicitUniformReturnT(...);
+
+template <typename TagType, typename A, typename B, typename ExplicitRet>
+auto ExplicitTaggedUniformReturnT(int) -> decltype(absl::Uniform<ExplicitRet>(
+ std::declval<TagType>(), *std::declval<absl::InsecureBitGen*>(),
+ std::declval<A>(), std::declval<B>()));
+
+template <typename, typename, typename, typename ExplicitRet>
+Invalid ExplicitTaggedUniformReturnT(...);
+
+// Given types <A, B, Expect>, CheckArgsReturnExpectedType() verifies that
+//
+// absl::Uniform<Expect>(gen, A{}, B{})
+//
+// returns the type "Expect", and that the function-overload has the signature
+//
+// Expect(URBG&, Expect, Expect)
+template <typename A, typename B, typename Expect>
+void CheckArgsReturnExpectedType() {
+ static_assert(
+ absl::conjunction<
+ std::is_same<Expect,
+ decltype(ExplicitUniformReturnT<A, B, Expect>(0))>,
+ std::is_same<Expect, decltype(ExplicitUniformReturnT<B, A, Expect>(
+ 0))>>::value,
+ "");
+ static_assert(
+ absl::conjunction<
+ std::is_same<Expect,
+ decltype(ExplicitTaggedUniformReturnT<
+ absl::IntervalOpenOpenTag, A, B, Expect>(0))>,
+ std::is_same<Expect, decltype(ExplicitTaggedUniformReturnT<
+ absl::IntervalOpenOpenTag, B, A,
+ Expect>(0))>>::value,
+ "");
+}
+
+TEST_F(RandomDistributionsTest, UniformTypeInference) {
+ // Infers common types.
+ CheckArgsInferType<uint16_t, uint16_t, uint16_t>();
+ CheckArgsInferType<uint32_t, uint32_t, uint32_t>();
+ CheckArgsInferType<uint64_t, uint64_t, uint64_t>();
+ CheckArgsInferType<int16_t, int16_t, int16_t>();
+ CheckArgsInferType<int32_t, int32_t, int32_t>();
+ CheckArgsInferType<int64_t, int64_t, int64_t>();
+ CheckArgsInferType<float, float, float>();
+ CheckArgsInferType<double, double, double>();
+
+ // Explicitly-specified return-values override inferences.
+ CheckArgsReturnExpectedType<int16_t, int16_t, int32_t>();
+ CheckArgsReturnExpectedType<uint16_t, uint16_t, int32_t>();
+ CheckArgsReturnExpectedType<int16_t, int16_t, int64_t>();
+ CheckArgsReturnExpectedType<int16_t, int32_t, int64_t>();
+ CheckArgsReturnExpectedType<int16_t, int32_t, double>();
+ CheckArgsReturnExpectedType<float, float, double>();
+ CheckArgsReturnExpectedType<int, int, int16_t>();
+
+ // Properly promotes uint16_t.
+ CheckArgsInferType<uint16_t, uint32_t, uint32_t>();
+ CheckArgsInferType<uint16_t, uint64_t, uint64_t>();
+ CheckArgsInferType<uint16_t, int32_t, int32_t>();
+ CheckArgsInferType<uint16_t, int64_t, int64_t>();
+ CheckArgsInferType<uint16_t, float, float>();
+ CheckArgsInferType<uint16_t, double, double>();
+
+ // Properly promotes int16_t.
+ CheckArgsInferType<int16_t, int32_t, int32_t>();
+ CheckArgsInferType<int16_t, int64_t, int64_t>();
+ CheckArgsInferType<int16_t, float, float>();
+ CheckArgsInferType<int16_t, double, double>();
+
+ // Invalid (u)int16_t-pairings do not compile.
+ // See "CheckArgsInferType" comments above, for how this is achieved.
+ CheckArgsInferType<uint16_t, int16_t, Invalid>();
+ CheckArgsInferType<int16_t, uint32_t, Invalid>();
+ CheckArgsInferType<int16_t, uint64_t, Invalid>();
+
+ // Properly promotes uint32_t.
+ CheckArgsInferType<uint32_t, uint64_t, uint64_t>();
+ CheckArgsInferType<uint32_t, int64_t, int64_t>();
+ CheckArgsInferType<uint32_t, double, double>();
+
+ // Properly promotes int32_t.
+ CheckArgsInferType<int32_t, int64_t, int64_t>();
+ CheckArgsInferType<int32_t, double, double>();
+
+ // Invalid (u)int32_t-pairings do not compile.
+ CheckArgsInferType<uint32_t, int32_t, Invalid>();
+ CheckArgsInferType<int32_t, uint64_t, Invalid>();
+ CheckArgsInferType<int32_t, float, Invalid>();
+ CheckArgsInferType<uint32_t, float, Invalid>();
+
+ // Invalid (u)int64_t-pairings do not compile.
+ CheckArgsInferType<uint64_t, int64_t, Invalid>();
+ CheckArgsInferType<int64_t, float, Invalid>();
+ CheckArgsInferType<int64_t, double, Invalid>();
+
+ // Properly promotes float.
+ CheckArgsInferType<float, double, double>();
+}
+
+TEST_F(RandomDistributionsTest, UniformExamples) {
+ // Examples.
+ absl::InsecureBitGen gen;
+ EXPECT_NE(1, absl::Uniform(gen, static_cast<uint16_t>(0), 1.0f));
+ EXPECT_NE(1, absl::Uniform(gen, 0, 1.0));
+ EXPECT_NE(1, absl::Uniform(absl::IntervalOpenOpen, gen,
+ static_cast<uint16_t>(0), 1.0f));
+ EXPECT_NE(1, absl::Uniform(absl::IntervalOpenOpen, gen, 0, 1.0));
+ EXPECT_NE(1, absl::Uniform(absl::IntervalOpenOpen, gen, -1, 1.0));
+ EXPECT_NE(1, absl::Uniform<double>(absl::IntervalOpenOpen, gen, -1, 1));
+ EXPECT_NE(1, absl::Uniform<float>(absl::IntervalOpenOpen, gen, 0, 1));
+ EXPECT_NE(1, absl::Uniform<float>(gen, 0, 1));
+}
+
+TEST_F(RandomDistributionsTest, UniformNoBounds) {
+ absl::InsecureBitGen gen;
+
+ absl::Uniform<uint8_t>(gen);
+ absl::Uniform<uint16_t>(gen);
+ absl::Uniform<uint32_t>(gen);
+ absl::Uniform<uint64_t>(gen);
+}
+
+TEST_F(RandomDistributionsTest, UniformNonsenseRanges) {
+ // The ranges used in this test are undefined behavior.
+ // The results are arbitrary and subject to future changes.
+ absl::InsecureBitGen gen;
+
+ // <uint>
+ EXPECT_EQ(0, absl::Uniform<uint64_t>(gen, 0, 0));
+ EXPECT_EQ(1, absl::Uniform<uint64_t>(gen, 1, 0));
+ EXPECT_EQ(0, absl::Uniform<uint64_t>(absl::IntervalOpenOpen, gen, 0, 0));
+ EXPECT_EQ(1, absl::Uniform<uint64_t>(absl::IntervalOpenOpen, gen, 1, 0));
+
+ constexpr auto m = (std::numeric_limits<uint64_t>::max)();
+
+ EXPECT_EQ(m, absl::Uniform(gen, m, m));
+ EXPECT_EQ(m, absl::Uniform(gen, m, m - 1));
+ EXPECT_EQ(m - 1, absl::Uniform(gen, m - 1, m));
+ EXPECT_EQ(m, absl::Uniform(absl::IntervalOpenOpen, gen, m, m));
+ EXPECT_EQ(m, absl::Uniform(absl::IntervalOpenOpen, gen, m, m - 1));
+ EXPECT_EQ(m - 1, absl::Uniform(absl::IntervalOpenOpen, gen, m - 1, m));
+
+ // <int>
+ EXPECT_EQ(0, absl::Uniform<int64_t>(gen, 0, 0));
+ EXPECT_EQ(1, absl::Uniform<int64_t>(gen, 1, 0));
+ EXPECT_EQ(0, absl::Uniform<int64_t>(absl::IntervalOpenOpen, gen, 0, 0));
+ EXPECT_EQ(1, absl::Uniform<int64_t>(absl::IntervalOpenOpen, gen, 1, 0));
+
+ constexpr auto l = (std::numeric_limits<int64_t>::min)();
+ constexpr auto r = (std::numeric_limits<int64_t>::max)();
+
+ EXPECT_EQ(l, absl::Uniform(gen, l, l));
+ EXPECT_EQ(r, absl::Uniform(gen, r, r));
+ EXPECT_EQ(r, absl::Uniform(gen, r, r - 1));
+ EXPECT_EQ(r - 1, absl::Uniform(gen, r - 1, r));
+ EXPECT_EQ(l, absl::Uniform(absl::IntervalOpenOpen, gen, l, l));
+ EXPECT_EQ(r, absl::Uniform(absl::IntervalOpenOpen, gen, r, r));
+ EXPECT_EQ(r, absl::Uniform(absl::IntervalOpenOpen, gen, r, r - 1));
+ EXPECT_EQ(r - 1, absl::Uniform(absl::IntervalOpenOpen, gen, r - 1, r));
+
+ // <double>
+ const double e = std::nextafter(1.0, 2.0); // 1 + epsilon
+ const double f = std::nextafter(1.0, 0.0); // 1 - epsilon
+ const double g = std::numeric_limits<double>::denorm_min();
+
+ EXPECT_EQ(1.0, absl::Uniform(gen, 1.0, e));
+ EXPECT_EQ(1.0, absl::Uniform(gen, 1.0, f));
+ EXPECT_EQ(0.0, absl::Uniform(gen, 0.0, g));
+
+ EXPECT_EQ(e, absl::Uniform(absl::IntervalOpenOpen, gen, 1.0, e));
+ EXPECT_EQ(f, absl::Uniform(absl::IntervalOpenOpen, gen, 1.0, f));
+ EXPECT_EQ(g, absl::Uniform(absl::IntervalOpenOpen, gen, 0.0, g));
+}
+
+// TODO(lar): Validate properties of non-default interval-semantics.
+TEST_F(RandomDistributionsTest, UniformReal) {
+ std::vector<double> values(kSize);
+
+ absl::InsecureBitGen gen;
+ for (int i = 0; i < kSize; i++) {
+ values[i] = absl::Uniform(gen, 0, 1.0);
+ }
+
+ const auto moments =
+ absl::random_internal::ComputeDistributionMoments(values);
+ EXPECT_NEAR(0.5, moments.mean, 0.02);
+ EXPECT_NEAR(1 / 12.0, moments.variance, 0.02);
+ EXPECT_NEAR(0.0, moments.skewness, 0.02);
+ EXPECT_NEAR(9 / 5.0, moments.kurtosis, 0.02);
+}
+
+TEST_F(RandomDistributionsTest, UniformInt) {
+ std::vector<double> values(kSize);
+
+ absl::InsecureBitGen gen;
+ for (int i = 0; i < kSize; i++) {
+ const int64_t kMax = 1000000000000ll;
+ int64_t j = absl::Uniform(absl::IntervalClosedClosed, gen, 0, kMax);
+ // convert to double.
+ values[i] = static_cast<double>(j) / static_cast<double>(kMax);
+ }
+
+ const auto moments =
+ absl::random_internal::ComputeDistributionMoments(values);
+ EXPECT_NEAR(0.5, moments.mean, 0.02);
+ EXPECT_NEAR(1 / 12.0, moments.variance, 0.02);
+ EXPECT_NEAR(0.0, moments.skewness, 0.02);
+ EXPECT_NEAR(9 / 5.0, moments.kurtosis, 0.02);
+
+ /*
+ // NOTE: These are not supported by absl::Uniform, which is specialized
+ // on integer and real valued types.
+
+ enum E { E0, E1 }; // enum
+ enum S : int { S0, S1 }; // signed enum
+ enum U : unsigned int { U0, U1 }; // unsigned enum
+
+ absl::Uniform(gen, E0, E1);
+ absl::Uniform(gen, S0, S1);
+ absl::Uniform(gen, U0, U1);
+ */
+}
+
+TEST_F(RandomDistributionsTest, Exponential) {
+ std::vector<double> values(kSize);
+
+ absl::InsecureBitGen gen;
+ for (int i = 0; i < kSize; i++) {
+ values[i] = absl::Exponential<double>(gen);
+ }
+
+ const auto moments =
+ absl::random_internal::ComputeDistributionMoments(values);
+ EXPECT_NEAR(1.0, moments.mean, 0.02);
+ EXPECT_NEAR(1.0, moments.variance, 0.025);
+ EXPECT_NEAR(2.0, moments.skewness, 0.1);
+ EXPECT_LT(5.0, moments.kurtosis);
+}
+
+TEST_F(RandomDistributionsTest, PoissonDefault) {
+ std::vector<double> values(kSize);
+
+ absl::InsecureBitGen gen;
+ for (int i = 0; i < kSize; i++) {
+ values[i] = absl::Poisson<int64_t>(gen);
+ }
+
+ const auto moments =
+ absl::random_internal::ComputeDistributionMoments(values);
+ EXPECT_NEAR(1.0, moments.mean, 0.02);
+ EXPECT_NEAR(1.0, moments.variance, 0.02);
+ EXPECT_NEAR(1.0, moments.skewness, 0.025);
+ EXPECT_LT(2.0, moments.kurtosis);
+}
+
+TEST_F(RandomDistributionsTest, PoissonLarge) {
+ constexpr double kMean = 100000000.0;
+ std::vector<double> values(kSize);
+
+ absl::InsecureBitGen gen;
+ for (int i = 0; i < kSize; i++) {
+ values[i] = absl::Poisson<int64_t>(gen, kMean);
+ }
+
+ const auto moments =
+ absl::random_internal::ComputeDistributionMoments(values);
+ EXPECT_NEAR(kMean, moments.mean, kMean * 0.015);
+ EXPECT_NEAR(kMean, moments.variance, kMean * 0.015);
+ EXPECT_NEAR(std::sqrt(kMean), moments.skewness, kMean * 0.02);
+ EXPECT_LT(2.0, moments.kurtosis);
+}
+
+TEST_F(RandomDistributionsTest, Bernoulli) {
+ constexpr double kP = 0.5151515151;
+ std::vector<double> values(kSize);
+
+ absl::InsecureBitGen gen;
+ for (int i = 0; i < kSize; i++) {
+ values[i] = absl::Bernoulli(gen, kP);
+ }
+
+ const auto moments =
+ absl::random_internal::ComputeDistributionMoments(values);
+ EXPECT_NEAR(kP, moments.mean, 0.01);
+}
+
+TEST_F(RandomDistributionsTest, Beta) {
+ constexpr double kAlpha = 2.0;
+ constexpr double kBeta = 3.0;
+ std::vector<double> values(kSize);
+
+ absl::InsecureBitGen gen;
+ for (int i = 0; i < kSize; i++) {
+ values[i] = absl::Beta(gen, kAlpha, kBeta);
+ }
+
+ const auto moments =
+ absl::random_internal::ComputeDistributionMoments(values);
+ EXPECT_NEAR(0.4, moments.mean, 0.01);
+}
+
+TEST_F(RandomDistributionsTest, Zipf) {
+ std::vector<double> values(kSize);
+
+ absl::InsecureBitGen gen;
+ for (int i = 0; i < kSize; i++) {
+ values[i] = absl::Zipf<int64_t>(gen, 100);
+ }
+
+ // The mean of a zipf distribution is: H(N, s-1) / H(N,s).
+ // Given the parameter v = 1, this gives the following function:
+ // (Hn(100, 1) - Hn(1,1)) / (Hn(100,2) - Hn(1,2)) = 6.5944
+ const auto moments =
+ absl::random_internal::ComputeDistributionMoments(values);
+ EXPECT_NEAR(6.5944, moments.mean, 2000) << moments;
+}
+
+TEST_F(RandomDistributionsTest, Gaussian) {
+ std::vector<double> values(kSize);
+
+ absl::InsecureBitGen gen;
+ for (int i = 0; i < kSize; i++) {
+ values[i] = absl::Gaussian<double>(gen);
+ }
+
+ const auto moments =
+ absl::random_internal::ComputeDistributionMoments(values);
+ EXPECT_NEAR(0.0, moments.mean, 0.02);
+ EXPECT_NEAR(1.0, moments.variance, 0.04);
+ EXPECT_NEAR(0, moments.skewness, 0.2);
+ EXPECT_NEAR(3.0, moments.kurtosis, 0.5);
+}
+
+TEST_F(RandomDistributionsTest, LogUniform) {
+ std::vector<double> values(kSize);
+
+ absl::InsecureBitGen gen;
+ for (int i = 0; i < kSize; i++) {
+ values[i] = absl::LogUniform<int64_t>(gen, 0, (1 << 10) - 1);
+ }
+
+ // The mean is the sum of the fractional means of the uniform distributions:
+ // [0..0][1..1][2..3][4..7][8..15][16..31][32..63]
+ // [64..127][128..255][256..511][512..1023]
+ const double mean = (0 + 1 + 1 + 2 + 3 + 4 + 7 + 8 + 15 + 16 + 31 + 32 + 63 +
+ 64 + 127 + 128 + 255 + 256 + 511 + 512 + 1023) /
+ (2.0 * 11.0);
+
+ const auto moments =
+ absl::random_internal::ComputeDistributionMoments(values);
+ EXPECT_NEAR(mean, moments.mean, 2) << moments;
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/random/examples_test.cc b/third_party/abseil/src/absl/random/examples_test.cc
new file mode 100644
index 0000000..1dcb514
--- /dev/null
+++ b/third_party/abseil/src/absl/random/examples_test.cc
@@ -0,0 +1,99 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <cinttypes>
+#include <random>
+#include <sstream>
+#include <vector>
+
+#include "gtest/gtest.h"
+#include "absl/random/random.h"
+
+template <typename T>
+void Use(T) {}
+
+TEST(Examples, Basic) {
+ absl::BitGen gen;
+ std::vector<int> objs = {10, 20, 30, 40, 50};
+
+ // Choose an element from a set.
+ auto elem = objs[absl::Uniform(gen, 0u, objs.size())];
+ Use(elem);
+
+ // Generate a uniform value between 1 and 6.
+ auto dice_roll = absl::Uniform<int>(absl::IntervalClosedClosed, gen, 1, 6);
+ Use(dice_roll);
+
+ // Generate a random byte.
+ auto byte = absl::Uniform<uint8_t>(gen);
+ Use(byte);
+
+ // Generate a fractional value from [0f, 1f).
+ auto fraction = absl::Uniform<float>(gen, 0, 1);
+ Use(fraction);
+
+ // Toss a fair coin; 50/50 probability.
+ bool coin_toss = absl::Bernoulli(gen, 0.5);
+ Use(coin_toss);
+
+ // Select a file size between 1k and 10MB, biased towards smaller file sizes.
+ auto file_size = absl::LogUniform<size_t>(gen, 1000, 10 * 1000 * 1000);
+ Use(file_size);
+
+ // Randomize (shuffle) a collection.
+ std::shuffle(std::begin(objs), std::end(objs), gen);
+}
+
+TEST(Examples, CreateingCorrelatedVariateSequences) {
+ // Unexpected PRNG correlation is often a source of bugs,
+ // so when using absl::BitGen it must be an intentional choice.
+ // NOTE: All of these only exhibit process-level stability.
+
+ // Create a correlated sequence from system entropy.
+ {
+ auto my_seed = absl::MakeSeedSeq();
+
+ absl::BitGen gen_1(my_seed);
+ absl::BitGen gen_2(my_seed); // Produces same variates as gen_1.
+
+ EXPECT_EQ(absl::Bernoulli(gen_1, 0.5), absl::Bernoulli(gen_2, 0.5));
+ EXPECT_EQ(absl::Uniform<uint32_t>(gen_1), absl::Uniform<uint32_t>(gen_2));
+ }
+
+ // Create a correlated sequence from an existing URBG.
+ {
+ absl::BitGen gen;
+
+ auto my_seed = absl::CreateSeedSeqFrom(&gen);
+ absl::BitGen gen_1(my_seed);
+ absl::BitGen gen_2(my_seed);
+
+ EXPECT_EQ(absl::Bernoulli(gen_1, 0.5), absl::Bernoulli(gen_2, 0.5));
+ EXPECT_EQ(absl::Uniform<uint32_t>(gen_1), absl::Uniform<uint32_t>(gen_2));
+ }
+
+ // An alternate construction which uses user-supplied data
+ // instead of a random seed.
+ {
+ const char kData[] = "A simple seed string";
+ std::seed_seq my_seed(std::begin(kData), std::end(kData));
+
+ absl::BitGen gen_1(my_seed);
+ absl::BitGen gen_2(my_seed);
+
+ EXPECT_EQ(absl::Bernoulli(gen_1, 0.5), absl::Bernoulli(gen_2, 0.5));
+ EXPECT_EQ(absl::Uniform<uint32_t>(gen_1), absl::Uniform<uint32_t>(gen_2));
+ }
+}
+
diff --git a/third_party/abseil/src/absl/random/exponential_distribution.h b/third_party/abseil/src/absl/random/exponential_distribution.h
new file mode 100644
index 0000000..b5caf8a
--- /dev/null
+++ b/third_party/abseil/src/absl/random/exponential_distribution.h
@@ -0,0 +1,165 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_RANDOM_EXPONENTIAL_DISTRIBUTION_H_
+#define ABSL_RANDOM_EXPONENTIAL_DISTRIBUTION_H_
+
+#include <cassert>
+#include <cmath>
+#include <istream>
+#include <limits>
+#include <type_traits>
+
+#include "absl/meta/type_traits.h"
+#include "absl/random/internal/fast_uniform_bits.h"
+#include "absl/random/internal/generate_real.h"
+#include "absl/random/internal/iostream_state_saver.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+// absl::exponential_distribution:
+// Generates a number conforming to an exponential distribution and is
+// equivalent to the standard [rand.dist.pois.exp] distribution.
+template <typename RealType = double>
+class exponential_distribution {
+ public:
+ using result_type = RealType;
+
+ class param_type {
+ public:
+ using distribution_type = exponential_distribution;
+
+ explicit param_type(result_type lambda = 1) : lambda_(lambda) {
+ assert(lambda > 0);
+ neg_inv_lambda_ = -result_type(1) / lambda_;
+ }
+
+ result_type lambda() const { return lambda_; }
+
+ friend bool operator==(const param_type& a, const param_type& b) {
+ return a.lambda_ == b.lambda_;
+ }
+
+ friend bool operator!=(const param_type& a, const param_type& b) {
+ return !(a == b);
+ }
+
+ private:
+ friend class exponential_distribution;
+
+ result_type lambda_;
+ result_type neg_inv_lambda_;
+
+ static_assert(
+ std::is_floating_point<RealType>::value,
+ "Class-template absl::exponential_distribution<> must be parameterized "
+ "using a floating-point type.");
+ };
+
+ exponential_distribution() : exponential_distribution(1) {}
+
+ explicit exponential_distribution(result_type lambda) : param_(lambda) {}
+
+ explicit exponential_distribution(const param_type& p) : param_(p) {}
+
+ void reset() {}
+
+ // Generating functions
+ template <typename URBG>
+ result_type operator()(URBG& g) { // NOLINT(runtime/references)
+ return (*this)(g, param_);
+ }
+
+ template <typename URBG>
+ result_type operator()(URBG& g, // NOLINT(runtime/references)
+ const param_type& p);
+
+ param_type param() const { return param_; }
+ void param(const param_type& p) { param_ = p; }
+
+ result_type(min)() const { return 0; }
+ result_type(max)() const {
+ return std::numeric_limits<result_type>::infinity();
+ }
+
+ result_type lambda() const { return param_.lambda(); }
+
+ friend bool operator==(const exponential_distribution& a,
+ const exponential_distribution& b) {
+ return a.param_ == b.param_;
+ }
+ friend bool operator!=(const exponential_distribution& a,
+ const exponential_distribution& b) {
+ return a.param_ != b.param_;
+ }
+
+ private:
+ param_type param_;
+ random_internal::FastUniformBits<uint64_t> fast_u64_;
+};
+
+// --------------------------------------------------------------------------
+// Implementation details follow
+// --------------------------------------------------------------------------
+
+template <typename RealType>
+template <typename URBG>
+typename exponential_distribution<RealType>::result_type
+exponential_distribution<RealType>::operator()(
+ URBG& g, // NOLINT(runtime/references)
+ const param_type& p) {
+ using random_internal::GenerateNegativeTag;
+ using random_internal::GenerateRealFromBits;
+ using real_type =
+ absl::conditional_t<std::is_same<RealType, float>::value, float, double>;
+
+ const result_type u = GenerateRealFromBits<real_type, GenerateNegativeTag,
+ false>(fast_u64_(g)); // U(-1, 0)
+
+ // log1p(-x) is mathematically equivalent to log(1 - x) but has more
+ // accuracy for x near zero.
+ return p.neg_inv_lambda_ * std::log1p(u);
+}
+
+template <typename CharT, typename Traits, typename RealType>
+std::basic_ostream<CharT, Traits>& operator<<(
+ std::basic_ostream<CharT, Traits>& os, // NOLINT(runtime/references)
+ const exponential_distribution<RealType>& x) {
+ auto saver = random_internal::make_ostream_state_saver(os);
+ os.precision(random_internal::stream_precision_helper<RealType>::kPrecision);
+ os << x.lambda();
+ return os;
+}
+
+template <typename CharT, typename Traits, typename RealType>
+std::basic_istream<CharT, Traits>& operator>>(
+ std::basic_istream<CharT, Traits>& is, // NOLINT(runtime/references)
+ exponential_distribution<RealType>& x) { // NOLINT(runtime/references)
+ using result_type = typename exponential_distribution<RealType>::result_type;
+ using param_type = typename exponential_distribution<RealType>::param_type;
+ result_type lambda;
+
+ auto saver = random_internal::make_istream_state_saver(is);
+ lambda = random_internal::read_floating_point<result_type>(is);
+ if (!is.fail()) {
+ x.param(param_type(lambda));
+ }
+ return is;
+}
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_RANDOM_EXPONENTIAL_DISTRIBUTION_H_
diff --git a/third_party/abseil/src/absl/random/exponential_distribution_test.cc b/third_party/abseil/src/absl/random/exponential_distribution_test.cc
new file mode 100644
index 0000000..8e9e69b
--- /dev/null
+++ b/third_party/abseil/src/absl/random/exponential_distribution_test.cc
@@ -0,0 +1,430 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/random/exponential_distribution.h"
+
+#include <algorithm>
+#include <cmath>
+#include <cstddef>
+#include <cstdint>
+#include <iterator>
+#include <limits>
+#include <random>
+#include <sstream>
+#include <string>
+#include <type_traits>
+#include <vector>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/base/internal/raw_logging.h"
+#include "absl/base/macros.h"
+#include "absl/random/internal/chi_square.h"
+#include "absl/random/internal/distribution_test_util.h"
+#include "absl/random/internal/pcg_engine.h"
+#include "absl/random/internal/sequence_urbg.h"
+#include "absl/random/random.h"
+#include "absl/strings/str_cat.h"
+#include "absl/strings/str_format.h"
+#include "absl/strings/str_replace.h"
+#include "absl/strings/strip.h"
+
+namespace {
+
+using absl::random_internal::kChiSquared;
+
+template <typename RealType>
+class ExponentialDistributionTypedTest : public ::testing::Test {};
+
+#if defined(__EMSCRIPTEN__)
+using RealTypes = ::testing::Types<float, double>;
+#else
+using RealTypes = ::testing::Types<float, double, long double>;
+#endif // defined(__EMSCRIPTEN__)
+TYPED_TEST_CASE(ExponentialDistributionTypedTest, RealTypes);
+
+TYPED_TEST(ExponentialDistributionTypedTest, SerializeTest) {
+ using param_type =
+ typename absl::exponential_distribution<TypeParam>::param_type;
+
+ const TypeParam kParams[] = {
+ // Cases around 1.
+ 1, //
+ std::nextafter(TypeParam(1), TypeParam(0)), // 1 - epsilon
+ std::nextafter(TypeParam(1), TypeParam(2)), // 1 + epsilon
+ // Typical cases.
+ TypeParam(1e-8), TypeParam(1e-4), TypeParam(1), TypeParam(2),
+ TypeParam(1e4), TypeParam(1e8), TypeParam(1e20), TypeParam(2.5),
+ // Boundary cases.
+ std::numeric_limits<TypeParam>::max(),
+ std::numeric_limits<TypeParam>::epsilon(),
+ std::nextafter(std::numeric_limits<TypeParam>::min(),
+ TypeParam(1)), // min + epsilon
+ std::numeric_limits<TypeParam>::min(), // smallest normal
+ // There are some errors dealing with denorms on apple platforms.
+ std::numeric_limits<TypeParam>::denorm_min(), // smallest denorm
+ std::numeric_limits<TypeParam>::min() / 2, // denorm
+ std::nextafter(std::numeric_limits<TypeParam>::min(),
+ TypeParam(0)), // denorm_max
+ };
+
+ constexpr int kCount = 1000;
+ absl::InsecureBitGen gen;
+
+ for (const TypeParam lambda : kParams) {
+ // Some values may be invalid; skip those.
+ if (!std::isfinite(lambda)) continue;
+ ABSL_ASSERT(lambda > 0);
+
+ const param_type param(lambda);
+
+ absl::exponential_distribution<TypeParam> before(lambda);
+ EXPECT_EQ(before.lambda(), param.lambda());
+
+ {
+ absl::exponential_distribution<TypeParam> via_param(param);
+ EXPECT_EQ(via_param, before);
+ EXPECT_EQ(via_param.param(), before.param());
+ }
+
+ // Smoke test.
+ auto sample_min = before.max();
+ auto sample_max = before.min();
+ for (int i = 0; i < kCount; i++) {
+ auto sample = before(gen);
+ EXPECT_GE(sample, before.min()) << before;
+ EXPECT_LE(sample, before.max()) << before;
+ if (sample > sample_max) sample_max = sample;
+ if (sample < sample_min) sample_min = sample;
+ }
+ if (!std::is_same<TypeParam, long double>::value) {
+ ABSL_INTERNAL_LOG(INFO,
+ absl::StrFormat("Range {%f}: %f, %f, lambda=%f", lambda,
+ sample_min, sample_max, lambda));
+ }
+
+ std::stringstream ss;
+ ss << before;
+
+ if (!std::isfinite(lambda)) {
+ // Streams do not deserialize inf/nan correctly.
+ continue;
+ }
+ // Validate stream serialization.
+ absl::exponential_distribution<TypeParam> after(34.56f);
+
+ EXPECT_NE(before.lambda(), after.lambda());
+ EXPECT_NE(before.param(), after.param());
+ EXPECT_NE(before, after);
+
+ ss >> after;
+
+#if defined(__powerpc64__) || defined(__PPC64__) || defined(__powerpc__) || \
+ defined(__ppc__) || defined(__PPC__)
+ if (std::is_same<TypeParam, long double>::value) {
+ // Roundtripping floating point values requires sufficient precision to
+ // reconstruct the exact value. It turns out that long double has some
+ // errors doing this on ppc, particularly for values
+ // near {1.0 +/- epsilon}.
+ if (lambda <= std::numeric_limits<double>::max() &&
+ lambda >= std::numeric_limits<double>::lowest()) {
+ EXPECT_EQ(static_cast<double>(before.lambda()),
+ static_cast<double>(after.lambda()))
+ << ss.str();
+ }
+ continue;
+ }
+#endif
+
+ EXPECT_EQ(before.lambda(), after.lambda()) //
+ << ss.str() << " " //
+ << (ss.good() ? "good " : "") //
+ << (ss.bad() ? "bad " : "") //
+ << (ss.eof() ? "eof " : "") //
+ << (ss.fail() ? "fail " : "");
+ }
+}
+
+// http://www.itl.nist.gov/div898/handbook/eda/section3/eda3667.htm
+
+class ExponentialModel {
+ public:
+ explicit ExponentialModel(double lambda)
+ : lambda_(lambda), beta_(1.0 / lambda) {}
+
+ double lambda() const { return lambda_; }
+
+ double mean() const { return beta_; }
+ double variance() const { return beta_ * beta_; }
+ double stddev() const { return std::sqrt(variance()); }
+ double skew() const { return 2; }
+ double kurtosis() const { return 6.0; }
+
+ double CDF(double x) { return 1.0 - std::exp(-lambda_ * x); }
+
+ // The inverse CDF, or PercentPoint function of the distribution
+ double InverseCDF(double p) {
+ ABSL_ASSERT(p >= 0.0);
+ ABSL_ASSERT(p < 1.0);
+ return -beta_ * std::log(1.0 - p);
+ }
+
+ private:
+ const double lambda_;
+ const double beta_;
+};
+
+struct Param {
+ double lambda;
+ double p_fail;
+ int trials;
+};
+
+class ExponentialDistributionTests : public testing::TestWithParam<Param>,
+ public ExponentialModel {
+ public:
+ ExponentialDistributionTests() : ExponentialModel(GetParam().lambda) {}
+
+ // SingleZTest provides a basic z-squared test of the mean vs. expected
+ // mean for data generated by the poisson distribution.
+ template <typename D>
+ bool SingleZTest(const double p, const size_t samples);
+
+ // SingleChiSquaredTest provides a basic chi-squared test of the normal
+ // distribution.
+ template <typename D>
+ double SingleChiSquaredTest();
+
+ // We use a fixed bit generator for distribution accuracy tests. This allows
+ // these tests to be deterministic, while still testing the qualify of the
+ // implementation.
+ absl::random_internal::pcg64_2018_engine rng_{0x2B7E151628AED2A6};
+};
+
+template <typename D>
+bool ExponentialDistributionTests::SingleZTest(const double p,
+ const size_t samples) {
+ D dis(lambda());
+
+ std::vector<double> data;
+ data.reserve(samples);
+ for (size_t i = 0; i < samples; i++) {
+ const double x = dis(rng_);
+ data.push_back(x);
+ }
+
+ const auto m = absl::random_internal::ComputeDistributionMoments(data);
+ const double max_err = absl::random_internal::MaxErrorTolerance(p);
+ const double z = absl::random_internal::ZScore(mean(), m);
+ const bool pass = absl::random_internal::Near("z", z, 0.0, max_err);
+
+ if (!pass) {
+ ABSL_INTERNAL_LOG(
+ INFO, absl::StrFormat("p=%f max_err=%f\n"
+ " lambda=%f\n"
+ " mean=%f vs. %f\n"
+ " stddev=%f vs. %f\n"
+ " skewness=%f vs. %f\n"
+ " kurtosis=%f vs. %f\n"
+ " z=%f vs. 0",
+ p, max_err, lambda(), m.mean, mean(),
+ std::sqrt(m.variance), stddev(), m.skewness,
+ skew(), m.kurtosis, kurtosis(), z));
+ }
+ return pass;
+}
+
+template <typename D>
+double ExponentialDistributionTests::SingleChiSquaredTest() {
+ const size_t kSamples = 10000;
+ const int kBuckets = 50;
+
+ // The InverseCDF is the percent point function of the distribution, and can
+ // be used to assign buckets roughly uniformly.
+ std::vector<double> cutoffs;
+ const double kInc = 1.0 / static_cast<double>(kBuckets);
+ for (double p = kInc; p < 1.0; p += kInc) {
+ cutoffs.push_back(InverseCDF(p));
+ }
+ if (cutoffs.back() != std::numeric_limits<double>::infinity()) {
+ cutoffs.push_back(std::numeric_limits<double>::infinity());
+ }
+
+ D dis(lambda());
+
+ std::vector<int32_t> counts(cutoffs.size(), 0);
+ for (int j = 0; j < kSamples; j++) {
+ const double x = dis(rng_);
+ auto it = std::upper_bound(cutoffs.begin(), cutoffs.end(), x);
+ counts[std::distance(cutoffs.begin(), it)]++;
+ }
+
+ // Null-hypothesis is that the distribution is exponentially distributed
+ // with the provided lambda (not estimated from the data).
+ const int dof = static_cast<int>(counts.size()) - 1;
+
+ // Our threshold for logging is 1-in-50.
+ const double threshold = absl::random_internal::ChiSquareValue(dof, 0.98);
+
+ const double expected =
+ static_cast<double>(kSamples) / static_cast<double>(counts.size());
+
+ double chi_square = absl::random_internal::ChiSquareWithExpected(
+ std::begin(counts), std::end(counts), expected);
+ double p = absl::random_internal::ChiSquarePValue(chi_square, dof);
+
+ if (chi_square > threshold) {
+ for (int i = 0; i < cutoffs.size(); i++) {
+ ABSL_INTERNAL_LOG(
+ INFO, absl::StrFormat("%d : (%f) = %d", i, cutoffs[i], counts[i]));
+ }
+
+ ABSL_INTERNAL_LOG(INFO,
+ absl::StrCat("lambda ", lambda(), "\n", //
+ " expected ", expected, "\n", //
+ kChiSquared, " ", chi_square, " (", p, ")\n",
+ kChiSquared, " @ 0.98 = ", threshold));
+ }
+ return p;
+}
+
+TEST_P(ExponentialDistributionTests, ZTest) {
+ const size_t kSamples = 10000;
+ const auto& param = GetParam();
+ const int expected_failures =
+ std::max(1, static_cast<int>(std::ceil(param.trials * param.p_fail)));
+ const double p = absl::random_internal::RequiredSuccessProbability(
+ param.p_fail, param.trials);
+
+ int failures = 0;
+ for (int i = 0; i < param.trials; i++) {
+ failures += SingleZTest<absl::exponential_distribution<double>>(p, kSamples)
+ ? 0
+ : 1;
+ }
+ EXPECT_LE(failures, expected_failures);
+}
+
+TEST_P(ExponentialDistributionTests, ChiSquaredTest) {
+ const int kTrials = 20;
+ int failures = 0;
+
+ for (int i = 0; i < kTrials; i++) {
+ double p_value =
+ SingleChiSquaredTest<absl::exponential_distribution<double>>();
+ if (p_value < 0.005) { // 1/200
+ failures++;
+ }
+ }
+
+ // There is a 0.10% chance of producing at least one failure, so raise the
+ // failure threshold high enough to allow for a flake rate < 10,000.
+ EXPECT_LE(failures, 4);
+}
+
+std::vector<Param> GenParams() {
+ return {
+ Param{1.0, 0.02, 100},
+ Param{2.5, 0.02, 100},
+ Param{10, 0.02, 100},
+ // large
+ Param{1e4, 0.02, 100},
+ Param{1e9, 0.02, 100},
+ // small
+ Param{0.1, 0.02, 100},
+ Param{1e-3, 0.02, 100},
+ Param{1e-5, 0.02, 100},
+ };
+}
+
+std::string ParamName(const ::testing::TestParamInfo<Param>& info) {
+ const auto& p = info.param;
+ std::string name = absl::StrCat("lambda_", absl::SixDigits(p.lambda));
+ return absl::StrReplaceAll(name, {{"+", "_"}, {"-", "_"}, {".", "_"}});
+}
+
+INSTANTIATE_TEST_CASE_P(All, ExponentialDistributionTests,
+ ::testing::ValuesIn(GenParams()), ParamName);
+
+// NOTE: absl::exponential_distribution is not guaranteed to be stable.
+TEST(ExponentialDistributionTest, StabilityTest) {
+ // absl::exponential_distribution stability relies on std::log1p and
+ // absl::uniform_real_distribution.
+ absl::random_internal::sequence_urbg urbg(
+ {0x0003eb76f6f7f755ull, 0xFFCEA50FDB2F953Bull, 0xC332DDEFBE6C5AA5ull,
+ 0x6558218568AB9702ull, 0x2AEF7DAD5B6E2F84ull, 0x1521B62829076170ull,
+ 0xECDD4775619F1510ull, 0x13CCA830EB61BD96ull, 0x0334FE1EAA0363CFull,
+ 0xB5735C904C70A239ull, 0xD59E9E0BCBAADE14ull, 0xEECC86BC60622CA7ull});
+
+ std::vector<int> output(14);
+
+ {
+ absl::exponential_distribution<double> dist;
+ std::generate(std::begin(output), std::end(output),
+ [&] { return static_cast<int>(10000.0 * dist(urbg)); });
+
+ EXPECT_EQ(14, urbg.invocations());
+ EXPECT_THAT(output,
+ testing::ElementsAre(0, 71913, 14375, 5039, 1835, 861, 25936,
+ 804, 126, 12337, 17984, 27002, 0, 71913));
+ }
+
+ urbg.reset();
+ {
+ absl::exponential_distribution<float> dist;
+ std::generate(std::begin(output), std::end(output),
+ [&] { return static_cast<int>(10000.0f * dist(urbg)); });
+
+ EXPECT_EQ(14, urbg.invocations());
+ EXPECT_THAT(output,
+ testing::ElementsAre(0, 71913, 14375, 5039, 1835, 861, 25936,
+ 804, 126, 12337, 17984, 27002, 0, 71913));
+ }
+}
+
+TEST(ExponentialDistributionTest, AlgorithmBounds) {
+ // Relies on absl::uniform_real_distribution, so some of these comments
+ // reference that.
+ absl::exponential_distribution<double> dist;
+
+ {
+ // This returns the smallest value >0 from absl::uniform_real_distribution.
+ absl::random_internal::sequence_urbg urbg({0x0000000000000001ull});
+ double a = dist(urbg);
+ EXPECT_EQ(a, 5.42101086242752217004e-20);
+ }
+
+ {
+ // This returns a value very near 0.5 from absl::uniform_real_distribution.
+ absl::random_internal::sequence_urbg urbg({0x7fffffffffffffefull});
+ double a = dist(urbg);
+ EXPECT_EQ(a, 0.693147180559945175204);
+ }
+
+ {
+ // This returns the largest value <1 from absl::uniform_real_distribution.
+ // WolframAlpha: ~39.1439465808987766283058547296341915292187253
+ absl::random_internal::sequence_urbg urbg({0xFFFFFFFFFFFFFFeFull});
+ double a = dist(urbg);
+ EXPECT_EQ(a, 36.7368005696771007251);
+ }
+ {
+ // This *ALSO* returns the largest value <1.
+ absl::random_internal::sequence_urbg urbg({0xFFFFFFFFFFFFFFFFull});
+ double a = dist(urbg);
+ EXPECT_EQ(a, 36.7368005696771007251);
+ }
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/random/gaussian_distribution.cc b/third_party/abseil/src/absl/random/gaussian_distribution.cc
new file mode 100644
index 0000000..c7a72cb
--- /dev/null
+++ b/third_party/abseil/src/absl/random/gaussian_distribution.cc
@@ -0,0 +1,104 @@
+// BEGIN GENERATED CODE; DO NOT EDIT
+// clang-format off
+
+#include "absl/random/gaussian_distribution.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace random_internal {
+
+const gaussian_distribution_base::Tables
+ gaussian_distribution_base::zg_ = {
+ {3.7130862467425505, 3.442619855899000214, 3.223084984581141565,
+ 3.083228858216868318, 2.978696252647779819, 2.894344007021528942,
+ 2.82312535054891045, 2.761169372387176857, 2.706113573121819549,
+ 2.656406411261359679, 2.610972248431847387, 2.56903362592493778,
+ 2.530009672388827457, 2.493454522095372106, 2.459018177411830486,
+ 2.426420645533749809, 2.395434278011062457, 2.365871370117638595,
+ 2.337575241339236776, 2.310413683698762988, 2.284274059677471769,
+ 2.25905957386919809, 2.234686395590979036, 2.21108140887870297,
+ 2.188180432076048731, 2.165926793748921497, 2.144270182360394905,
+ 2.123165708673976138, 2.102573135189237608, 2.082456237992015957,
+ 2.062782274508307978, 2.043521536655067194, 2.02464697337738464,
+ 2.006133869963471206, 1.987959574127619033, 1.970103260854325633,
+ 1.952545729553555764, 1.935269228296621957, 1.918257300864508963,
+ 1.901494653105150423, 1.884967035707758143, 1.868661140994487768,
+ 1.852564511728090002, 1.836665460258444904, 1.820952996596124418,
+ 1.805416764219227366, 1.790046982599857506, 1.77483439558606837,
+ 1.759770224899592339, 1.744846128113799244, 1.730054160563729182,
+ 1.71538674071366648, 1.700836618569915748, 1.686396846779167014,
+ 1.6720607540975998, 1.657821920954023254, 1.643674156862867441,
+ 1.629611479470633562, 1.615628095043159629, 1.601718380221376581,
+ 1.587876864890574558, 1.574098216022999264, 1.560377222366167382,
+ 1.546708779859908844, 1.533087877674041755, 1.519509584765938559,
+ 1.505969036863201937, 1.492461423781352714, 1.478981976989922842,
+ 1.465525957342709296, 1.452088642889222792, 1.438665316684561546,
+ 1.425251254514058319, 1.411841712447055919, 1.398431914131003539,
+ 1.385017037732650058, 1.371592202427340812, 1.358152454330141534,
+ 1.34469275175354519, 1.331207949665625279, 1.317692783209412299,
+ 1.304141850128615054, 1.290549591926194894, 1.27691027356015363,
+ 1.263217961454619287, 1.249466499573066436, 1.23564948326336066,
+ 1.221760230539994385, 1.207791750415947662, 1.193736707833126465,
+ 1.17958738466398616, 1.165335636164750222, 1.150972842148865416,
+ 1.136489852013158774, 1.121876922582540237, 1.107123647534034028,
+ 1.092218876907275371, 1.077150624892893482, 1.061905963694822042,
+ 1.046470900764042922, 1.030830236068192907, 1.014967395251327842,
+ 0.9988642334929808131, 0.9825008035154263464, 0.9658550794011470098,
+ 0.9489026255113034436, 0.9316161966151479401, 0.9139652510230292792,
+ 0.8959153525809346874, 0.8774274291129204872, 0.8584568431938099931,
+ 0.8389522142975741614, 0.8188539067003538507, 0.7980920606440534693,
+ 0.7765839878947563557, 0.7542306644540520688, 0.7309119106424850631,
+ 0.7064796113354325779, 0.6807479186691505202, 0.6534786387399710295,
+ 0.6243585973360461505, 0.5929629424714434327, 0.5586921784081798625,
+ 0.5206560387620546848, 0.4774378372966830431, 0.4265479863554152429,
+ 0.3628714310970211909, 0.2723208648139477384, 0},
+ {0.001014352564120377413, 0.002669629083880922793, 0.005548995220771345792,
+ 0.008624484412859888607, 0.01183947865788486861, 0.01516729801054656976,
+ 0.01859210273701129151, 0.02210330461592709475, 0.02569329193593428151,
+ 0.02935631744000685023, 0.03308788614622575758, 0.03688438878665621645,
+ 0.04074286807444417458, 0.04466086220049143157, 0.04863629585986780496,
+ 0.05266740190305100461, 0.05675266348104984759, 0.06089077034804041277,
+ 0.06508058521306804567, 0.06932111739357792179, 0.07361150188411341722,
+ 0.07795098251397346301, 0.08233889824223575293, 0.08677467189478028919,
+ 0.09125780082683036809, 0.095787849121731522, 0.1003644410286559929,
+ 0.1049872554094214289, 0.1096560210148404546, 0.1143705124488661323,
+ 0.1191305467076509556, 0.1239359802028679736, 0.1287867061959434012,
+ 0.1336826525834396151, 0.1386237799845948804, 0.1436100800906280339,
+ 0.1486415742423425057, 0.1537183122081819397, 0.1588403711394795748,
+ 0.1640078546834206341, 0.1692208922373653057, 0.1744796383307898324,
+ 0.1797842721232958407, 0.1851349970089926078, 0.1905320403191375633,
+ 0.1959756531162781534, 0.2014661100743140865, 0.2070037094399269362,
+ 0.2125887730717307134, 0.2182216465543058426, 0.2239026993850088965,
+ 0.229632325232116602, 0.2354109422634795556, 0.2412389935454402889,
+ 0.2471169475123218551, 0.2530452985073261551, 0.2590245673962052742,
+ 0.2650553022555897087, 0.271138079138385224, 0.2772735029191887857,
+ 0.2834622082232336471, 0.2897048604429605656, 0.2960021568469337061,
+ 0.3023548277864842593, 0.3087636380061818397, 0.3152293880650116065,
+ 0.3217529158759855901, 0.3283350983728509642, 0.3349768533135899506,
+ 0.3416791412315512977, 0.3484429675463274756, 0.355269384847918035,
+ 0.3621594953693184626, 0.3691144536644731522, 0.376135469510563536,
+ 0.3832238110559021416, 0.3903808082373155797, 0.3976078564938743676,
+ 0.404906420807223999, 0.4122780401026620578, 0.4197243320495753771,
+ 0.4272469983049970721, 0.4348478302499918513, 0.4425287152754694975,
+ 0.4502916436820402768, 0.458138716267873114, 0.4660721526894572309,
+ 0.4740943006930180559, 0.4822076463294863724, 0.4904148252838453348,
+ 0.4987186354709807201, 0.5071220510755701794, 0.5156282382440030565,
+ 0.5242405726729852944, 0.5329626593838373561, 0.5417983550254266145,
+ 0.5507517931146057588, 0.5598274127040882009, 0.5690299910679523787,
+ 0.5783646811197646898, 0.5878370544347081283, 0.5974531509445183408,
+ 0.6072195366251219584, 0.6171433708188825973, 0.6272324852499290282,
+ 0.6374954773350440806, 0.6479418211102242475, 0.6585820000500898219,
+ 0.6694276673488921414, 0.6804918409973358395, 0.6917891434366769676,
+ 0.7033360990161600101, 0.7151515074105005976, 0.7272569183441868201,
+ 0.7396772436726493094, 0.7524415591746134169, 0.7655841738977066102,
+ 0.7791460859296898134, 0.7931770117713072832, 0.8077382946829627652,
+ 0.8229072113814113187, 0.8387836052959920519, 0.8555006078694531446,
+ 0.873243048910072206, 0.8922816507840289901, 0.9130436479717434217,
+ 0.9362826816850632339, 0.9635996931270905952, 1}};
+
+} // namespace random_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+// clang-format on
+// END GENERATED CODE
diff --git a/third_party/abseil/src/absl/random/gaussian_distribution.h b/third_party/abseil/src/absl/random/gaussian_distribution.h
new file mode 100644
index 0000000..4b07a5c
--- /dev/null
+++ b/third_party/abseil/src/absl/random/gaussian_distribution.h
@@ -0,0 +1,275 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_RANDOM_GAUSSIAN_DISTRIBUTION_H_
+#define ABSL_RANDOM_GAUSSIAN_DISTRIBUTION_H_
+
+// absl::gaussian_distribution implements the Ziggurat algorithm
+// for generating random gaussian numbers.
+//
+// Implementation based on "The Ziggurat Method for Generating Random Variables"
+// by George Marsaglia and Wai Wan Tsang: http://www.jstatsoft.org/v05/i08/
+//
+
+#include <cmath>
+#include <cstdint>
+#include <istream>
+#include <limits>
+#include <type_traits>
+
+#include "absl/base/config.h"
+#include "absl/random/internal/fast_uniform_bits.h"
+#include "absl/random/internal/generate_real.h"
+#include "absl/random/internal/iostream_state_saver.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace random_internal {
+
+// absl::gaussian_distribution_base implements the underlying ziggurat algorithm
+// using the ziggurat tables generated by the gaussian_distribution_gentables
+// binary.
+//
+// The specific algorithm has some of the improvements suggested by the
+// 2005 paper, "An Improved Ziggurat Method to Generate Normal Random Samples",
+// Jurgen A Doornik. (https://www.doornik.com/research/ziggurat.pdf)
+class ABSL_DLL gaussian_distribution_base {
+ public:
+ template <typename URBG>
+ inline double zignor(URBG& g); // NOLINT(runtime/references)
+
+ private:
+ friend class TableGenerator;
+
+ template <typename URBG>
+ inline double zignor_fallback(URBG& g, // NOLINT(runtime/references)
+ bool neg);
+
+ // Constants used for the gaussian distribution.
+ static constexpr double kR = 3.442619855899; // Start of the tail.
+ static constexpr double kRInv = 0.29047645161474317; // ~= (1.0 / kR) .
+ static constexpr double kV = 9.91256303526217e-3;
+ static constexpr uint64_t kMask = 0x07f;
+
+ // The ziggurat tables store the pdf(f) and inverse-pdf(x) for equal-area
+ // points on one-half of the normal distribution, where the pdf function,
+ // pdf = e ^ (-1/2 *x^2), assumes that the mean = 0 & stddev = 1.
+ //
+ // These tables are just over 2kb in size; larger tables might improve the
+ // distributions, but also lead to more cache pollution.
+ //
+ // x = {3.71308, 3.44261, 3.22308, ..., 0}
+ // f = {0.00101, 0.00266, 0.00554, ..., 1}
+ struct Tables {
+ double x[kMask + 2];
+ double f[kMask + 2];
+ };
+ static const Tables zg_;
+ random_internal::FastUniformBits<uint64_t> fast_u64_;
+};
+
+} // namespace random_internal
+
+// absl::gaussian_distribution:
+// Generates a number conforming to a Gaussian distribution.
+template <typename RealType = double>
+class gaussian_distribution : random_internal::gaussian_distribution_base {
+ public:
+ using result_type = RealType;
+
+ class param_type {
+ public:
+ using distribution_type = gaussian_distribution;
+
+ explicit param_type(result_type mean = 0, result_type stddev = 1)
+ : mean_(mean), stddev_(stddev) {}
+
+ // Returns the mean distribution parameter. The mean specifies the location
+ // of the peak. The default value is 0.0.
+ result_type mean() const { return mean_; }
+
+ // Returns the deviation distribution parameter. The default value is 1.0.
+ result_type stddev() const { return stddev_; }
+
+ friend bool operator==(const param_type& a, const param_type& b) {
+ return a.mean_ == b.mean_ && a.stddev_ == b.stddev_;
+ }
+
+ friend bool operator!=(const param_type& a, const param_type& b) {
+ return !(a == b);
+ }
+
+ private:
+ result_type mean_;
+ result_type stddev_;
+
+ static_assert(
+ std::is_floating_point<RealType>::value,
+ "Class-template absl::gaussian_distribution<> must be parameterized "
+ "using a floating-point type.");
+ };
+
+ gaussian_distribution() : gaussian_distribution(0) {}
+
+ explicit gaussian_distribution(result_type mean, result_type stddev = 1)
+ : param_(mean, stddev) {}
+
+ explicit gaussian_distribution(const param_type& p) : param_(p) {}
+
+ void reset() {}
+
+ // Generating functions
+ template <typename URBG>
+ result_type operator()(URBG& g) { // NOLINT(runtime/references)
+ return (*this)(g, param_);
+ }
+
+ template <typename URBG>
+ result_type operator()(URBG& g, // NOLINT(runtime/references)
+ const param_type& p);
+
+ param_type param() const { return param_; }
+ void param(const param_type& p) { param_ = p; }
+
+ result_type(min)() const {
+ return -std::numeric_limits<result_type>::infinity();
+ }
+ result_type(max)() const {
+ return std::numeric_limits<result_type>::infinity();
+ }
+
+ result_type mean() const { return param_.mean(); }
+ result_type stddev() const { return param_.stddev(); }
+
+ friend bool operator==(const gaussian_distribution& a,
+ const gaussian_distribution& b) {
+ return a.param_ == b.param_;
+ }
+ friend bool operator!=(const gaussian_distribution& a,
+ const gaussian_distribution& b) {
+ return a.param_ != b.param_;
+ }
+
+ private:
+ param_type param_;
+};
+
+// --------------------------------------------------------------------------
+// Implementation details only below
+// --------------------------------------------------------------------------
+
+template <typename RealType>
+template <typename URBG>
+typename gaussian_distribution<RealType>::result_type
+gaussian_distribution<RealType>::operator()(
+ URBG& g, // NOLINT(runtime/references)
+ const param_type& p) {
+ return p.mean() + p.stddev() * static_cast<result_type>(zignor(g));
+}
+
+template <typename CharT, typename Traits, typename RealType>
+std::basic_ostream<CharT, Traits>& operator<<(
+ std::basic_ostream<CharT, Traits>& os, // NOLINT(runtime/references)
+ const gaussian_distribution<RealType>& x) {
+ auto saver = random_internal::make_ostream_state_saver(os);
+ os.precision(random_internal::stream_precision_helper<RealType>::kPrecision);
+ os << x.mean() << os.fill() << x.stddev();
+ return os;
+}
+
+template <typename CharT, typename Traits, typename RealType>
+std::basic_istream<CharT, Traits>& operator>>(
+ std::basic_istream<CharT, Traits>& is, // NOLINT(runtime/references)
+ gaussian_distribution<RealType>& x) { // NOLINT(runtime/references)
+ using result_type = typename gaussian_distribution<RealType>::result_type;
+ using param_type = typename gaussian_distribution<RealType>::param_type;
+
+ auto saver = random_internal::make_istream_state_saver(is);
+ auto mean = random_internal::read_floating_point<result_type>(is);
+ if (is.fail()) return is;
+ auto stddev = random_internal::read_floating_point<result_type>(is);
+ if (!is.fail()) {
+ x.param(param_type(mean, stddev));
+ }
+ return is;
+}
+
+namespace random_internal {
+
+template <typename URBG>
+inline double gaussian_distribution_base::zignor_fallback(URBG& g, bool neg) {
+ using random_internal::GeneratePositiveTag;
+ using random_internal::GenerateRealFromBits;
+
+ // This fallback path happens approximately 0.05% of the time.
+ double x, y;
+ do {
+ // kRInv = 1/r, U(0, 1)
+ x = kRInv *
+ std::log(GenerateRealFromBits<double, GeneratePositiveTag, false>(
+ fast_u64_(g)));
+ y = -std::log(
+ GenerateRealFromBits<double, GeneratePositiveTag, false>(fast_u64_(g)));
+ } while ((y + y) < (x * x));
+ return neg ? (x - kR) : (kR - x);
+}
+
+template <typename URBG>
+inline double gaussian_distribution_base::zignor(
+ URBG& g) { // NOLINT(runtime/references)
+ using random_internal::GeneratePositiveTag;
+ using random_internal::GenerateRealFromBits;
+ using random_internal::GenerateSignedTag;
+
+ while (true) {
+ // We use a single uint64_t to generate both a double and a strip.
+ // These bits are unused when the generated double is > 1/2^5.
+ // This may introduce some bias from the duplicated low bits of small
+ // values (those smaller than 1/2^5, which all end up on the left tail).
+ uint64_t bits = fast_u64_(g);
+ int i = static_cast<int>(bits & kMask); // pick a random strip
+ double j = GenerateRealFromBits<double, GenerateSignedTag, false>(
+ bits); // U(-1, 1)
+ const double x = j * zg_.x[i];
+
+ // Retangular box. Handles >97% of all cases.
+ // For any given box, this handles between 75% and 99% of values.
+ // Equivalent to U(01) < (x[i+1] / x[i]), and when i == 0, ~93.5%
+ if (std::abs(x) < zg_.x[i + 1]) {
+ return x;
+ }
+
+ // i == 0: Base box. Sample using a ratio of uniforms.
+ if (i == 0) {
+ // This path happens about 0.05% of the time.
+ return zignor_fallback(g, j < 0);
+ }
+
+ // i > 0: Wedge samples using precomputed values.
+ double v = GenerateRealFromBits<double, GeneratePositiveTag, false>(
+ fast_u64_(g)); // U(0, 1)
+ if ((zg_.f[i + 1] + v * (zg_.f[i] - zg_.f[i + 1])) <
+ std::exp(-0.5 * x * x)) {
+ return x;
+ }
+
+ // The wedge was missed; reject the value and try again.
+ }
+}
+
+} // namespace random_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_RANDOM_GAUSSIAN_DISTRIBUTION_H_
diff --git a/third_party/abseil/src/absl/random/gaussian_distribution_test.cc b/third_party/abseil/src/absl/random/gaussian_distribution_test.cc
new file mode 100644
index 0000000..02ac578
--- /dev/null
+++ b/third_party/abseil/src/absl/random/gaussian_distribution_test.cc
@@ -0,0 +1,579 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/random/gaussian_distribution.h"
+
+#include <algorithm>
+#include <cmath>
+#include <cstddef>
+#include <ios>
+#include <iterator>
+#include <random>
+#include <string>
+#include <vector>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/base/internal/raw_logging.h"
+#include "absl/base/macros.h"
+#include "absl/random/internal/chi_square.h"
+#include "absl/random/internal/distribution_test_util.h"
+#include "absl/random/internal/sequence_urbg.h"
+#include "absl/random/random.h"
+#include "absl/strings/str_cat.h"
+#include "absl/strings/str_format.h"
+#include "absl/strings/str_replace.h"
+#include "absl/strings/strip.h"
+
+namespace {
+
+using absl::random_internal::kChiSquared;
+
+template <typename RealType>
+class GaussianDistributionInterfaceTest : public ::testing::Test {};
+
+using RealTypes = ::testing::Types<float, double, long double>;
+TYPED_TEST_CASE(GaussianDistributionInterfaceTest, RealTypes);
+
+TYPED_TEST(GaussianDistributionInterfaceTest, SerializeTest) {
+ using param_type =
+ typename absl::gaussian_distribution<TypeParam>::param_type;
+
+ const TypeParam kParams[] = {
+ // Cases around 1.
+ 1, //
+ std::nextafter(TypeParam(1), TypeParam(0)), // 1 - epsilon
+ std::nextafter(TypeParam(1), TypeParam(2)), // 1 + epsilon
+ // Arbitrary values.
+ TypeParam(1e-8), TypeParam(1e-4), TypeParam(2), TypeParam(1e4),
+ TypeParam(1e8), TypeParam(1e20), TypeParam(2.5),
+ // Boundary cases.
+ std::numeric_limits<TypeParam>::infinity(),
+ std::numeric_limits<TypeParam>::max(),
+ std::numeric_limits<TypeParam>::epsilon(),
+ std::nextafter(std::numeric_limits<TypeParam>::min(),
+ TypeParam(1)), // min + epsilon
+ std::numeric_limits<TypeParam>::min(), // smallest normal
+ // There are some errors dealing with denorms on apple platforms.
+ std::numeric_limits<TypeParam>::denorm_min(), // smallest denorm
+ std::numeric_limits<TypeParam>::min() / 2,
+ std::nextafter(std::numeric_limits<TypeParam>::min(),
+ TypeParam(0)), // denorm_max
+ };
+
+ constexpr int kCount = 1000;
+ absl::InsecureBitGen gen;
+
+ // Use a loop to generate the combinations of {+/-x, +/-y}, and assign x, y to
+ // all values in kParams,
+ for (const auto mod : {0, 1, 2, 3}) {
+ for (const auto x : kParams) {
+ if (!std::isfinite(x)) continue;
+ for (const auto y : kParams) {
+ const TypeParam mean = (mod & 0x1) ? -x : x;
+ const TypeParam stddev = (mod & 0x2) ? -y : y;
+ const param_type param(mean, stddev);
+
+ absl::gaussian_distribution<TypeParam> before(mean, stddev);
+ EXPECT_EQ(before.mean(), param.mean());
+ EXPECT_EQ(before.stddev(), param.stddev());
+
+ {
+ absl::gaussian_distribution<TypeParam> via_param(param);
+ EXPECT_EQ(via_param, before);
+ EXPECT_EQ(via_param.param(), before.param());
+ }
+
+ // Smoke test.
+ auto sample_min = before.max();
+ auto sample_max = before.min();
+ for (int i = 0; i < kCount; i++) {
+ auto sample = before(gen);
+ if (sample > sample_max) sample_max = sample;
+ if (sample < sample_min) sample_min = sample;
+ EXPECT_GE(sample, before.min()) << before;
+ EXPECT_LE(sample, before.max()) << before;
+ }
+ if (!std::is_same<TypeParam, long double>::value) {
+ ABSL_INTERNAL_LOG(
+ INFO, absl::StrFormat("Range{%f, %f}: %f, %f", mean, stddev,
+ sample_min, sample_max));
+ }
+
+ std::stringstream ss;
+ ss << before;
+
+ if (!std::isfinite(mean) || !std::isfinite(stddev)) {
+ // Streams do not parse inf/nan.
+ continue;
+ }
+
+ // Validate stream serialization.
+ absl::gaussian_distribution<TypeParam> after(-0.53f, 2.3456f);
+
+ EXPECT_NE(before.mean(), after.mean());
+ EXPECT_NE(before.stddev(), after.stddev());
+ EXPECT_NE(before.param(), after.param());
+ EXPECT_NE(before, after);
+
+ ss >> after;
+
+#if defined(__powerpc64__) || defined(__PPC64__) || defined(__powerpc__) || \
+ defined(__ppc__) || defined(__PPC__) || defined(__EMSCRIPTEN__)
+ if (std::is_same<TypeParam, long double>::value) {
+ // Roundtripping floating point values requires sufficient precision
+ // to reconstruct the exact value. It turns out that long double
+ // has some errors doing this on ppc, particularly for values
+ // near {1.0 +/- epsilon}.
+ //
+ // Emscripten is even worse, implementing long double as a 128-bit
+ // type, but shipping with a strtold() that doesn't support that.
+ if (mean <= std::numeric_limits<double>::max() &&
+ mean >= std::numeric_limits<double>::lowest()) {
+ EXPECT_EQ(static_cast<double>(before.mean()),
+ static_cast<double>(after.mean()))
+ << ss.str();
+ }
+ if (stddev <= std::numeric_limits<double>::max() &&
+ stddev >= std::numeric_limits<double>::lowest()) {
+ EXPECT_EQ(static_cast<double>(before.stddev()),
+ static_cast<double>(after.stddev()))
+ << ss.str();
+ }
+ continue;
+ }
+#endif
+
+ EXPECT_EQ(before.mean(), after.mean());
+ EXPECT_EQ(before.stddev(), after.stddev()) //
+ << ss.str() << " " //
+ << (ss.good() ? "good " : "") //
+ << (ss.bad() ? "bad " : "") //
+ << (ss.eof() ? "eof " : "") //
+ << (ss.fail() ? "fail " : "");
+ }
+ }
+ }
+}
+
+// http://www.itl.nist.gov/div898/handbook/eda/section3/eda3661.htm
+
+class GaussianModel {
+ public:
+ GaussianModel(double mean, double stddev) : mean_(mean), stddev_(stddev) {}
+
+ double mean() const { return mean_; }
+ double variance() const { return stddev() * stddev(); }
+ double stddev() const { return stddev_; }
+ double skew() const { return 0; }
+ double kurtosis() const { return 3.0; }
+
+ // The inverse CDF, or PercentPoint function.
+ double InverseCDF(double p) {
+ ABSL_ASSERT(p >= 0.0);
+ ABSL_ASSERT(p < 1.0);
+ return mean() + stddev() * -absl::random_internal::InverseNormalSurvival(p);
+ }
+
+ private:
+ const double mean_;
+ const double stddev_;
+};
+
+struct Param {
+ double mean;
+ double stddev;
+ double p_fail; // Z-Test probability of failure.
+ int trials; // Z-Test trials.
+};
+
+// GaussianDistributionTests implements a z-test for the gaussian
+// distribution.
+class GaussianDistributionTests : public testing::TestWithParam<Param>,
+ public GaussianModel {
+ public:
+ GaussianDistributionTests()
+ : GaussianModel(GetParam().mean, GetParam().stddev) {}
+
+ // SingleZTest provides a basic z-squared test of the mean vs. expected
+ // mean for data generated by the poisson distribution.
+ template <typename D>
+ bool SingleZTest(const double p, const size_t samples);
+
+ // SingleChiSquaredTest provides a basic chi-squared test of the normal
+ // distribution.
+ template <typename D>
+ double SingleChiSquaredTest();
+
+ // We use a fixed bit generator for distribution accuracy tests. This allows
+ // these tests to be deterministic, while still testing the qualify of the
+ // implementation.
+ absl::random_internal::pcg64_2018_engine rng_{0x2B7E151628AED2A6};
+};
+
+template <typename D>
+bool GaussianDistributionTests::SingleZTest(const double p,
+ const size_t samples) {
+ D dis(mean(), stddev());
+
+ std::vector<double> data;
+ data.reserve(samples);
+ for (size_t i = 0; i < samples; i++) {
+ const double x = dis(rng_);
+ data.push_back(x);
+ }
+
+ const double max_err = absl::random_internal::MaxErrorTolerance(p);
+ const auto m = absl::random_internal::ComputeDistributionMoments(data);
+ const double z = absl::random_internal::ZScore(mean(), m);
+ const bool pass = absl::random_internal::Near("z", z, 0.0, max_err);
+
+ // NOTE: Informational statistical test:
+ //
+ // Compute the Jarque-Bera test statistic given the excess skewness
+ // and kurtosis. The statistic is drawn from a chi-square(2) distribution.
+ // https://en.wikipedia.org/wiki/Jarque%E2%80%93Bera_test
+ //
+ // The null-hypothesis (normal distribution) is rejected when
+ // (p = 0.05 => jb > 5.99)
+ // (p = 0.01 => jb > 9.21)
+ // NOTE: JB has a large type-I error rate, so it will reject the
+ // null-hypothesis even when it is true more often than the z-test.
+ //
+ const double jb =
+ static_cast<double>(m.n) / 6.0 *
+ (std::pow(m.skewness, 2.0) + std::pow(m.kurtosis - 3.0, 2.0) / 4.0);
+
+ if (!pass || jb > 9.21) {
+ ABSL_INTERNAL_LOG(
+ INFO, absl::StrFormat("p=%f max_err=%f\n"
+ " mean=%f vs. %f\n"
+ " stddev=%f vs. %f\n"
+ " skewness=%f vs. %f\n"
+ " kurtosis=%f vs. %f\n"
+ " z=%f vs. 0\n"
+ " jb=%f vs. 9.21",
+ p, max_err, m.mean, mean(), std::sqrt(m.variance),
+ stddev(), m.skewness, skew(), m.kurtosis,
+ kurtosis(), z, jb));
+ }
+ return pass;
+}
+
+template <typename D>
+double GaussianDistributionTests::SingleChiSquaredTest() {
+ const size_t kSamples = 10000;
+ const int kBuckets = 50;
+
+ // The InverseCDF is the percent point function of the
+ // distribution, and can be used to assign buckets
+ // roughly uniformly.
+ std::vector<double> cutoffs;
+ const double kInc = 1.0 / static_cast<double>(kBuckets);
+ for (double p = kInc; p < 1.0; p += kInc) {
+ cutoffs.push_back(InverseCDF(p));
+ }
+ if (cutoffs.back() != std::numeric_limits<double>::infinity()) {
+ cutoffs.push_back(std::numeric_limits<double>::infinity());
+ }
+
+ D dis(mean(), stddev());
+
+ std::vector<int32_t> counts(cutoffs.size(), 0);
+ for (int j = 0; j < kSamples; j++) {
+ const double x = dis(rng_);
+ auto it = std::upper_bound(cutoffs.begin(), cutoffs.end(), x);
+ counts[std::distance(cutoffs.begin(), it)]++;
+ }
+
+ // Null-hypothesis is that the distribution is a gaussian distribution
+ // with the provided mean and stddev (not estimated from the data).
+ const int dof = static_cast<int>(counts.size()) - 1;
+
+ // Our threshold for logging is 1-in-50.
+ const double threshold = absl::random_internal::ChiSquareValue(dof, 0.98);
+
+ const double expected =
+ static_cast<double>(kSamples) / static_cast<double>(counts.size());
+
+ double chi_square = absl::random_internal::ChiSquareWithExpected(
+ std::begin(counts), std::end(counts), expected);
+ double p = absl::random_internal::ChiSquarePValue(chi_square, dof);
+
+ // Log if the chi_square value is above the threshold.
+ if (chi_square > threshold) {
+ for (int i = 0; i < cutoffs.size(); i++) {
+ ABSL_INTERNAL_LOG(
+ INFO, absl::StrFormat("%d : (%f) = %d", i, cutoffs[i], counts[i]));
+ }
+
+ ABSL_INTERNAL_LOG(
+ INFO, absl::StrCat("mean=", mean(), " stddev=", stddev(), "\n", //
+ " expected ", expected, "\n", //
+ kChiSquared, " ", chi_square, " (", p, ")\n", //
+ kChiSquared, " @ 0.98 = ", threshold));
+ }
+ return p;
+}
+
+TEST_P(GaussianDistributionTests, ZTest) {
+ // TODO(absl-team): Run these tests against std::normal_distribution<double>
+ // to validate outcomes are similar.
+ const size_t kSamples = 10000;
+ const auto& param = GetParam();
+ const int expected_failures =
+ std::max(1, static_cast<int>(std::ceil(param.trials * param.p_fail)));
+ const double p = absl::random_internal::RequiredSuccessProbability(
+ param.p_fail, param.trials);
+
+ int failures = 0;
+ for (int i = 0; i < param.trials; i++) {
+ failures +=
+ SingleZTest<absl::gaussian_distribution<double>>(p, kSamples) ? 0 : 1;
+ }
+ EXPECT_LE(failures, expected_failures);
+}
+
+TEST_P(GaussianDistributionTests, ChiSquaredTest) {
+ const int kTrials = 20;
+ int failures = 0;
+
+ for (int i = 0; i < kTrials; i++) {
+ double p_value =
+ SingleChiSquaredTest<absl::gaussian_distribution<double>>();
+ if (p_value < 0.0025) { // 1/400
+ failures++;
+ }
+ }
+ // There is a 0.05% chance of producing at least one failure, so raise the
+ // failure threshold high enough to allow for a flake rate of less than one in
+ // 10,000.
+ EXPECT_LE(failures, 4);
+}
+
+std::vector<Param> GenParams() {
+ return {
+ // Mean around 0.
+ Param{0.0, 1.0, 0.01, 100},
+ Param{0.0, 1e2, 0.01, 100},
+ Param{0.0, 1e4, 0.01, 100},
+ Param{0.0, 1e8, 0.01, 100},
+ Param{0.0, 1e16, 0.01, 100},
+ Param{0.0, 1e-3, 0.01, 100},
+ Param{0.0, 1e-5, 0.01, 100},
+ Param{0.0, 1e-9, 0.01, 100},
+ Param{0.0, 1e-17, 0.01, 100},
+
+ // Mean around 1.
+ Param{1.0, 1.0, 0.01, 100},
+ Param{1.0, 1e2, 0.01, 100},
+ Param{1.0, 1e-2, 0.01, 100},
+
+ // Mean around 100 / -100
+ Param{1e2, 1.0, 0.01, 100},
+ Param{-1e2, 1.0, 0.01, 100},
+ Param{1e2, 1e6, 0.01, 100},
+ Param{-1e2, 1e6, 0.01, 100},
+
+ // More extreme
+ Param{1e4, 1e4, 0.01, 100},
+ Param{1e8, 1e4, 0.01, 100},
+ Param{1e12, 1e4, 0.01, 100},
+ };
+}
+
+std::string ParamName(const ::testing::TestParamInfo<Param>& info) {
+ const auto& p = info.param;
+ std::string name = absl::StrCat("mean_", absl::SixDigits(p.mean), "__stddev_",
+ absl::SixDigits(p.stddev));
+ return absl::StrReplaceAll(name, {{"+", "_"}, {"-", "_"}, {".", "_"}});
+}
+
+INSTANTIATE_TEST_SUITE_P(All, GaussianDistributionTests,
+ ::testing::ValuesIn(GenParams()), ParamName);
+
+// NOTE: absl::gaussian_distribution is not guaranteed to be stable.
+TEST(GaussianDistributionTest, StabilityTest) {
+ // absl::gaussian_distribution stability relies on the underlying zignor
+ // data, absl::random_interna::RandU64ToDouble, std::exp, std::log, and
+ // std::abs.
+ absl::random_internal::sequence_urbg urbg(
+ {0x0003eb76f6f7f755ull, 0xFFCEA50FDB2F953Bull, 0xC332DDEFBE6C5AA5ull,
+ 0x6558218568AB9702ull, 0x2AEF7DAD5B6E2F84ull, 0x1521B62829076170ull,
+ 0xECDD4775619F1510ull, 0x13CCA830EB61BD96ull, 0x0334FE1EAA0363CFull,
+ 0xB5735C904C70A239ull, 0xD59E9E0BCBAADE14ull, 0xEECC86BC60622CA7ull});
+
+ std::vector<int> output(11);
+
+ {
+ absl::gaussian_distribution<double> dist;
+ std::generate(std::begin(output), std::end(output),
+ [&] { return static_cast<int>(10000000.0 * dist(urbg)); });
+
+ EXPECT_EQ(13, urbg.invocations());
+ EXPECT_THAT(output, //
+ testing::ElementsAre(1494, 25518841, 9991550, 1351856,
+ -20373238, 3456682, 333530, -6804981,
+ -15279580, -16459654, 1494));
+ }
+
+ urbg.reset();
+ {
+ absl::gaussian_distribution<float> dist;
+ std::generate(std::begin(output), std::end(output),
+ [&] { return static_cast<int>(1000000.0f * dist(urbg)); });
+
+ EXPECT_EQ(13, urbg.invocations());
+ EXPECT_THAT(
+ output, //
+ testing::ElementsAre(149, 2551884, 999155, 135185, -2037323, 345668,
+ 33353, -680498, -1527958, -1645965, 149));
+ }
+}
+
+// This is an implementation-specific test. If any part of the implementation
+// changes, then it is likely that this test will change as well.
+// Also, if dependencies of the distribution change, such as RandU64ToDouble,
+// then this is also likely to change.
+TEST(GaussianDistributionTest, AlgorithmBounds) {
+ absl::gaussian_distribution<double> dist;
+
+ // In ~95% of cases, a single value is used to generate the output.
+ // for all inputs where |x| < 0.750461021389 this should be the case.
+ //
+ // The exact constraints are based on the ziggurat tables, and any
+ // changes to the ziggurat tables may require adjusting these bounds.
+ //
+ // for i in range(0, len(X)-1):
+ // print i, X[i+1]/X[i], (X[i+1]/X[i] > 0.984375)
+ //
+ // 0.125 <= |values| <= 0.75
+ const uint64_t kValues[] = {
+ 0x1000000000000100ull, 0x2000000000000100ull, 0x3000000000000100ull,
+ 0x4000000000000100ull, 0x5000000000000100ull, 0x6000000000000100ull,
+ // negative values
+ 0x9000000000000100ull, 0xa000000000000100ull, 0xb000000000000100ull,
+ 0xc000000000000100ull, 0xd000000000000100ull, 0xe000000000000100ull};
+
+ // 0.875 <= |values| <= 0.984375
+ const uint64_t kExtraValues[] = {
+ 0x7000000000000100ull, 0x7800000000000100ull, //
+ 0x7c00000000000100ull, 0x7e00000000000100ull, //
+ // negative values
+ 0xf000000000000100ull, 0xf800000000000100ull, //
+ 0xfc00000000000100ull, 0xfe00000000000100ull};
+
+ auto make_box = [](uint64_t v, uint64_t box) {
+ return (v & 0xffffffffffffff80ull) | box;
+ };
+
+ // The box is the lower 7 bits of the value. When the box == 0, then
+ // the algorithm uses an escape hatch to select the result for large
+ // outputs.
+ for (uint64_t box = 0; box < 0x7f; box++) {
+ for (const uint64_t v : kValues) {
+ // Extra values are added to the sequence to attempt to avoid
+ // infinite loops from rejection sampling on bugs/errors.
+ absl::random_internal::sequence_urbg urbg(
+ {make_box(v, box), 0x0003eb76f6f7f755ull, 0x5FCEA50FDB2F953Bull});
+
+ auto a = dist(urbg);
+ EXPECT_EQ(1, urbg.invocations()) << box << " " << std::hex << v;
+ if (v & 0x8000000000000000ull) {
+ EXPECT_LT(a, 0.0) << box << " " << std::hex << v;
+ } else {
+ EXPECT_GT(a, 0.0) << box << " " << std::hex << v;
+ }
+ }
+ if (box > 10 && box < 100) {
+ // The center boxes use the fast algorithm for more
+ // than 98.4375% of values.
+ for (const uint64_t v : kExtraValues) {
+ absl::random_internal::sequence_urbg urbg(
+ {make_box(v, box), 0x0003eb76f6f7f755ull, 0x5FCEA50FDB2F953Bull});
+
+ auto a = dist(urbg);
+ EXPECT_EQ(1, urbg.invocations()) << box << " " << std::hex << v;
+ if (v & 0x8000000000000000ull) {
+ EXPECT_LT(a, 0.0) << box << " " << std::hex << v;
+ } else {
+ EXPECT_GT(a, 0.0) << box << " " << std::hex << v;
+ }
+ }
+ }
+ }
+
+ // When the box == 0, the fallback algorithm uses a ratio of uniforms,
+ // which consumes 2 additional values from the urbg.
+ // Fallback also requires that the initial value be > 0.9271586026096681.
+ auto make_fallback = [](uint64_t v) { return (v & 0xffffffffffffff80ull); };
+
+ double tail[2];
+ {
+ // 0.9375
+ absl::random_internal::sequence_urbg urbg(
+ {make_fallback(0x7800000000000000ull), 0x13CCA830EB61BD96ull,
+ 0x00000076f6f7f755ull});
+ tail[0] = dist(urbg);
+ EXPECT_EQ(3, urbg.invocations());
+ EXPECT_GT(tail[0], 0);
+ }
+ {
+ // -0.9375
+ absl::random_internal::sequence_urbg urbg(
+ {make_fallback(0xf800000000000000ull), 0x13CCA830EB61BD96ull,
+ 0x00000076f6f7f755ull});
+ tail[1] = dist(urbg);
+ EXPECT_EQ(3, urbg.invocations());
+ EXPECT_LT(tail[1], 0);
+ }
+ EXPECT_EQ(tail[0], -tail[1]);
+ EXPECT_EQ(418610, static_cast<int64_t>(tail[0] * 100000.0));
+
+ // When the box != 0, the fallback algorithm computes a wedge function.
+ // Depending on the box, the threshold for varies as high as
+ // 0.991522480228.
+ {
+ // 0.9921875, 0.875
+ absl::random_internal::sequence_urbg urbg(
+ {make_box(0x7f00000000000000ull, 120), 0xe000000000000001ull,
+ 0x13CCA830EB61BD96ull});
+ tail[0] = dist(urbg);
+ EXPECT_EQ(2, urbg.invocations());
+ EXPECT_GT(tail[0], 0);
+ }
+ {
+ // -0.9921875, 0.875
+ absl::random_internal::sequence_urbg urbg(
+ {make_box(0xff00000000000000ull, 120), 0xe000000000000001ull,
+ 0x13CCA830EB61BD96ull});
+ tail[1] = dist(urbg);
+ EXPECT_EQ(2, urbg.invocations());
+ EXPECT_LT(tail[1], 0);
+ }
+ EXPECT_EQ(tail[0], -tail[1]);
+ EXPECT_EQ(61948, static_cast<int64_t>(tail[0] * 100000.0));
+
+ // Fallback rejected, try again.
+ {
+ // -0.9921875, 0.0625
+ absl::random_internal::sequence_urbg urbg(
+ {make_box(0xff00000000000000ull, 120), 0x1000000000000001,
+ make_box(0x1000000000000100ull, 50), 0x13CCA830EB61BD96ull});
+ dist(urbg);
+ EXPECT_EQ(3, urbg.invocations());
+ }
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/random/generators_test.cc b/third_party/abseil/src/absl/random/generators_test.cc
new file mode 100644
index 0000000..41725f1
--- /dev/null
+++ b/third_party/abseil/src/absl/random/generators_test.cc
@@ -0,0 +1,179 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <cstddef>
+#include <cstdint>
+#include <random>
+#include <vector>
+
+#include "gtest/gtest.h"
+#include "absl/random/distributions.h"
+#include "absl/random/random.h"
+
+namespace {
+
+template <typename URBG>
+void TestUniform(URBG* gen) {
+ // [a, b) default-semantics, inferred types.
+ absl::Uniform(*gen, 0, 100); // int
+ absl::Uniform(*gen, 0, 1.0); // Promoted to double
+ absl::Uniform(*gen, 0.0f, 1.0); // Promoted to double
+ absl::Uniform(*gen, 0.0, 1.0); // double
+ absl::Uniform(*gen, -1, 1L); // Promoted to long
+
+ // Roll a die.
+ absl::Uniform(absl::IntervalClosedClosed, *gen, 1, 6);
+
+ // Get a fraction.
+ absl::Uniform(absl::IntervalOpenOpen, *gen, 0.0, 1.0);
+
+ // Assign a value to a random element.
+ std::vector<int> elems = {10, 20, 30, 40, 50};
+ elems[absl::Uniform(*gen, 0u, elems.size())] = 5;
+ elems[absl::Uniform<size_t>(*gen, 0, elems.size())] = 3;
+
+ // Choose some epsilon around zero.
+ absl::Uniform(absl::IntervalOpenOpen, *gen, -1.0, 1.0);
+
+ // (a, b) semantics, inferred types.
+ absl::Uniform(absl::IntervalOpenOpen, *gen, 0, 1.0); // Promoted to double
+
+ // Explict overriding of types.
+ absl::Uniform<int>(*gen, 0, 100);
+ absl::Uniform<int8_t>(*gen, 0, 100);
+ absl::Uniform<int16_t>(*gen, 0, 100);
+ absl::Uniform<uint16_t>(*gen, 0, 100);
+ absl::Uniform<int32_t>(*gen, 0, 1 << 10);
+ absl::Uniform<uint32_t>(*gen, 0, 1 << 10);
+ absl::Uniform<int64_t>(*gen, 0, 1 << 10);
+ absl::Uniform<uint64_t>(*gen, 0, 1 << 10);
+
+ absl::Uniform<float>(*gen, 0.0, 1.0);
+ absl::Uniform<float>(*gen, 0, 1);
+ absl::Uniform<float>(*gen, -1, 1);
+ absl::Uniform<double>(*gen, 0.0, 1.0);
+
+ absl::Uniform<float>(*gen, -1.0, 0);
+ absl::Uniform<double>(*gen, -1.0, 0);
+
+ // Tagged
+ absl::Uniform<double>(absl::IntervalClosedClosed, *gen, 0, 1);
+ absl::Uniform<double>(absl::IntervalClosedOpen, *gen, 0, 1);
+ absl::Uniform<double>(absl::IntervalOpenOpen, *gen, 0, 1);
+ absl::Uniform<double>(absl::IntervalOpenClosed, *gen, 0, 1);
+ absl::Uniform<double>(absl::IntervalClosedClosed, *gen, 0, 1);
+ absl::Uniform<double>(absl::IntervalOpenOpen, *gen, 0, 1);
+
+ absl::Uniform<int>(absl::IntervalClosedClosed, *gen, 0, 100);
+ absl::Uniform<int>(absl::IntervalClosedOpen, *gen, 0, 100);
+ absl::Uniform<int>(absl::IntervalOpenOpen, *gen, 0, 100);
+ absl::Uniform<int>(absl::IntervalOpenClosed, *gen, 0, 100);
+ absl::Uniform<int>(absl::IntervalClosedClosed, *gen, 0, 100);
+ absl::Uniform<int>(absl::IntervalOpenOpen, *gen, 0, 100);
+
+ // With *generator as an R-value reference.
+ absl::Uniform<int>(URBG(), 0, 100);
+ absl::Uniform<double>(URBG(), 0.0, 1.0);
+}
+
+template <typename URBG>
+void TestExponential(URBG* gen) {
+ absl::Exponential<float>(*gen);
+ absl::Exponential<double>(*gen);
+ absl::Exponential<double>(URBG());
+}
+
+template <typename URBG>
+void TestPoisson(URBG* gen) {
+ // [rand.dist.pois] Indicates that the std::poisson_distribution
+ // is parameterized by IntType, however MSVC does not allow 8-bit
+ // types.
+ absl::Poisson<int>(*gen);
+ absl::Poisson<int16_t>(*gen);
+ absl::Poisson<uint16_t>(*gen);
+ absl::Poisson<int32_t>(*gen);
+ absl::Poisson<uint32_t>(*gen);
+ absl::Poisson<int64_t>(*gen);
+ absl::Poisson<uint64_t>(*gen);
+ absl::Poisson<uint64_t>(URBG());
+}
+
+template <typename URBG>
+void TestBernoulli(URBG* gen) {
+ absl::Bernoulli(*gen, 0.5);
+ absl::Bernoulli(*gen, 0.5);
+}
+
+template <typename URBG>
+void TestZipf(URBG* gen) {
+ absl::Zipf<int>(*gen, 100);
+ absl::Zipf<int8_t>(*gen, 100);
+ absl::Zipf<int16_t>(*gen, 100);
+ absl::Zipf<uint16_t>(*gen, 100);
+ absl::Zipf<int32_t>(*gen, 1 << 10);
+ absl::Zipf<uint32_t>(*gen, 1 << 10);
+ absl::Zipf<int64_t>(*gen, 1 << 10);
+ absl::Zipf<uint64_t>(*gen, 1 << 10);
+ absl::Zipf<uint64_t>(URBG(), 1 << 10);
+}
+
+template <typename URBG>
+void TestGaussian(URBG* gen) {
+ absl::Gaussian<float>(*gen, 1.0, 1.0);
+ absl::Gaussian<double>(*gen, 1.0, 1.0);
+ absl::Gaussian<double>(URBG(), 1.0, 1.0);
+}
+
+template <typename URBG>
+void TestLogNormal(URBG* gen) {
+ absl::LogUniform<int>(*gen, 0, 100);
+ absl::LogUniform<int8_t>(*gen, 0, 100);
+ absl::LogUniform<int16_t>(*gen, 0, 100);
+ absl::LogUniform<uint16_t>(*gen, 0, 100);
+ absl::LogUniform<int32_t>(*gen, 0, 1 << 10);
+ absl::LogUniform<uint32_t>(*gen, 0, 1 << 10);
+ absl::LogUniform<int64_t>(*gen, 0, 1 << 10);
+ absl::LogUniform<uint64_t>(*gen, 0, 1 << 10);
+ absl::LogUniform<uint64_t>(URBG(), 0, 1 << 10);
+}
+
+template <typename URBG>
+void CompatibilityTest() {
+ URBG gen;
+
+ TestUniform(&gen);
+ TestExponential(&gen);
+ TestPoisson(&gen);
+ TestBernoulli(&gen);
+ TestZipf(&gen);
+ TestGaussian(&gen);
+ TestLogNormal(&gen);
+}
+
+TEST(std_mt19937_64, Compatibility) {
+ // Validate with std::mt19937_64
+ CompatibilityTest<std::mt19937_64>();
+}
+
+TEST(BitGen, Compatibility) {
+ // Validate with absl::BitGen
+ CompatibilityTest<absl::BitGen>();
+}
+
+TEST(InsecureBitGen, Compatibility) {
+ // Validate with absl::InsecureBitGen
+ CompatibilityTest<absl::InsecureBitGen>();
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/random/internal/BUILD.bazel b/third_party/abseil/src/absl/random/internal/BUILD.bazel
new file mode 100644
index 0000000..8485e28
--- /dev/null
+++ b/third_party/abseil/src/absl/random/internal/BUILD.bazel
@@ -0,0 +1,730 @@
+#
+# Copyright 2019 The Abseil Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+load("@rules_cc//cc:defs.bzl", "cc_binary", "cc_library", "cc_test")
+
+# Internal-only implementation classes for Abseil Random
+load(
+ "//absl:copts/configure_copts.bzl",
+ "ABSL_DEFAULT_COPTS",
+ "ABSL_DEFAULT_LINKOPTS",
+ "ABSL_RANDOM_RANDEN_COPTS",
+ "ABSL_TEST_COPTS",
+ "absl_random_randen_copts_init",
+)
+
+package(default_visibility = [
+ "//absl/random:__pkg__",
+])
+
+licenses(["notice"])
+
+cc_library(
+ name = "traits",
+ hdrs = ["traits.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = ["//absl/base:config"],
+)
+
+cc_library(
+ name = "distribution_caller",
+ hdrs = ["distribution_caller.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ "//absl/base:config",
+ "//absl/base:fast_type_id",
+ "//absl/utility",
+ ],
+)
+
+cc_library(
+ name = "fast_uniform_bits",
+ hdrs = [
+ "fast_uniform_bits.h",
+ ],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ "//absl/base:config",
+ "//absl/meta:type_traits",
+ ],
+)
+
+cc_library(
+ name = "seed_material",
+ srcs = [
+ "seed_material.cc",
+ ],
+ hdrs = [
+ "seed_material.h",
+ ],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS + select({
+ "//absl:windows": ["-DEFAULTLIB:bcrypt.lib"],
+ "//conditions:default": [],
+ }),
+ deps = [
+ ":fast_uniform_bits",
+ "//absl/base:core_headers",
+ "//absl/base:raw_logging_internal",
+ "//absl/strings",
+ "//absl/types:optional",
+ "//absl/types:span",
+ ],
+)
+
+cc_library(
+ name = "pool_urbg",
+ srcs = [
+ "pool_urbg.cc",
+ ],
+ hdrs = [
+ "pool_urbg.h",
+ ],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = select({
+ "//absl:windows": [],
+ "//absl:wasm": [],
+ "//conditions:default": ["-pthread"],
+ }) + ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":randen",
+ ":seed_material",
+ ":traits",
+ "//absl/base",
+ "//absl/base:config",
+ "//absl/base:core_headers",
+ "//absl/base:endian",
+ "//absl/base:raw_logging_internal",
+ "//absl/random:seed_gen_exception",
+ "//absl/types:span",
+ ],
+)
+
+cc_library(
+ name = "explicit_seed_seq",
+ testonly = 1,
+ hdrs = [
+ "explicit_seed_seq.h",
+ ],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = ["//absl/base:config"],
+)
+
+cc_library(
+ name = "sequence_urbg",
+ testonly = 1,
+ hdrs = [
+ "sequence_urbg.h",
+ ],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = ["//absl/base:config"],
+)
+
+cc_library(
+ name = "salted_seed_seq",
+ hdrs = [
+ "salted_seed_seq.h",
+ ],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":seed_material",
+ "//absl/container:inlined_vector",
+ "//absl/meta:type_traits",
+ "//absl/types:optional",
+ "//absl/types:span",
+ ],
+)
+
+cc_library(
+ name = "iostream_state_saver",
+ hdrs = ["iostream_state_saver.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ "//absl/meta:type_traits",
+ "//absl/numeric:int128",
+ ],
+)
+
+cc_library(
+ name = "generate_real",
+ hdrs = [
+ "generate_real.h",
+ ],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":fastmath",
+ ":traits",
+ "//absl/base:bits",
+ "//absl/meta:type_traits",
+ ],
+)
+
+cc_library(
+ name = "fastmath",
+ hdrs = [
+ "fastmath.h",
+ ],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = ["//absl/base:bits"],
+)
+
+cc_library(
+ name = "wide_multiply",
+ hdrs = ["wide_multiply.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":traits",
+ "//absl/base:bits",
+ "//absl/base:config",
+ "//absl/numeric:int128",
+ ],
+)
+
+cc_library(
+ name = "nonsecure_base",
+ hdrs = ["nonsecure_base.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":pool_urbg",
+ ":salted_seed_seq",
+ ":seed_material",
+ "//absl/base:core_headers",
+ "//absl/meta:type_traits",
+ "//absl/types:optional",
+ "//absl/types:span",
+ ],
+)
+
+cc_library(
+ name = "pcg_engine",
+ hdrs = ["pcg_engine.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":fastmath",
+ ":iostream_state_saver",
+ "//absl/base:config",
+ "//absl/meta:type_traits",
+ "//absl/numeric:int128",
+ ],
+)
+
+cc_library(
+ name = "randen_engine",
+ hdrs = ["randen_engine.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":iostream_state_saver",
+ ":randen",
+ "//absl/meta:type_traits",
+ ],
+)
+
+cc_library(
+ name = "platform",
+ srcs = [
+ "randen_round_keys.cc",
+ ],
+ hdrs = [
+ "randen_traits.h",
+ ],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ textual_hdrs = [
+ "platform.h",
+ ],
+ deps = ["//absl/base:config"],
+)
+
+cc_library(
+ name = "randen",
+ srcs = [
+ "randen.cc",
+ ],
+ hdrs = [
+ "randen.h",
+ ],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":platform",
+ ":randen_hwaes",
+ ":randen_slow",
+ "//absl/base:raw_logging_internal",
+ ],
+)
+
+cc_library(
+ name = "randen_slow",
+ srcs = ["randen_slow.cc"],
+ hdrs = ["randen_slow.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":platform",
+ "//absl/base:config",
+ "//absl/base:core_headers",
+ ],
+)
+
+absl_random_randen_copts_init()
+
+cc_library(
+ name = "randen_hwaes",
+ srcs = [
+ "randen_detect.cc",
+ ],
+ hdrs = [
+ "randen_detect.h",
+ "randen_hwaes.h",
+ ],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":platform",
+ ":randen_hwaes_impl",
+ "//absl/base:config",
+ ],
+)
+
+# build with --save_temps to see assembly language output.
+cc_library(
+ name = "randen_hwaes_impl",
+ srcs = [
+ "randen_hwaes.cc",
+ "randen_hwaes.h",
+ ],
+ copts = ABSL_DEFAULT_COPTS + ABSL_RANDOM_RANDEN_COPTS + select({
+ "//absl:windows": [],
+ "//conditions:default": ["-Wno-pass-failed"],
+ }),
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":platform",
+ "//absl/base:config",
+ "//absl/base:core_headers",
+ ],
+)
+
+cc_binary(
+ name = "gaussian_distribution_gentables",
+ srcs = [
+ "gaussian_distribution_gentables.cc",
+ ],
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ "//absl/base:core_headers",
+ "//absl/random:distributions",
+ ],
+)
+
+cc_library(
+ name = "distribution_test_util",
+ testonly = 1,
+ srcs = [
+ "chi_square.cc",
+ "distribution_test_util.cc",
+ ],
+ hdrs = [
+ "chi_square.h",
+ "distribution_test_util.h",
+ ],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ "//absl/base:config",
+ "//absl/base:core_headers",
+ "//absl/base:raw_logging_internal",
+ "//absl/strings",
+ "//absl/strings:str_format",
+ "//absl/types:span",
+ ],
+)
+
+# Common tags for tests, etc.
+ABSL_RANDOM_NONPORTABLE_TAGS = [
+ "no_test_android_arm",
+ "no_test_android_arm64",
+ "no_test_android_x86",
+ "no_test_darwin_x86_64",
+ "no_test_ios_x86_64",
+ "no_test_loonix",
+ "no_test_msvc_x64",
+ "no_test_wasm",
+]
+
+cc_test(
+ name = "traits_test",
+ size = "small",
+ srcs = ["traits_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":traits",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "generate_real_test",
+ size = "small",
+ srcs = [
+ "generate_real_test.cc",
+ ],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":generate_real",
+ "//absl/base:bits",
+ "//absl/flags:flag",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "distribution_test_util_test",
+ size = "small",
+ srcs = ["distribution_test_util_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":distribution_test_util",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "fastmath_test",
+ size = "small",
+ srcs = ["fastmath_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":fastmath",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "explicit_seed_seq_test",
+ size = "small",
+ srcs = ["explicit_seed_seq_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":explicit_seed_seq",
+ "//absl/random:seed_sequences",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "salted_seed_seq_test",
+ size = "small",
+ srcs = ["salted_seed_seq_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":salted_seed_seq",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "chi_square_test",
+ size = "small",
+ srcs = [
+ "chi_square_test.cc",
+ ],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":distribution_test_util",
+ "//absl/base:core_headers",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "fast_uniform_bits_test",
+ size = "small",
+ srcs = [
+ "fast_uniform_bits_test.cc",
+ ],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":fast_uniform_bits",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_library(
+ name = "mock_helpers",
+ hdrs = ["mock_helpers.h"],
+ deps = [
+ "//absl/base:fast_type_id",
+ "//absl/types:optional",
+ ],
+)
+
+cc_library(
+ name = "mock_overload_set",
+ testonly = 1,
+ hdrs = ["mock_overload_set.h"],
+ deps = [
+ ":mock_helpers",
+ "//absl/random:mocking_bit_gen",
+ "@com_google_googletest//:gtest",
+ ],
+)
+
+cc_test(
+ name = "nonsecure_base_test",
+ size = "small",
+ srcs = [
+ "nonsecure_base_test.cc",
+ ],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":nonsecure_base",
+ "//absl/random",
+ "//absl/random:distributions",
+ "//absl/random:seed_sequences",
+ "//absl/strings",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "seed_material_test",
+ size = "small",
+ srcs = ["seed_material_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":seed_material",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "pool_urbg_test",
+ size = "small",
+ srcs = [
+ "pool_urbg_test.cc",
+ ],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":pool_urbg",
+ "//absl/meta:type_traits",
+ "//absl/types:span",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "pcg_engine_test",
+ size = "medium", # Trying to measure accuracy.
+ srcs = ["pcg_engine_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ flaky = 1,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":explicit_seed_seq",
+ ":pcg_engine",
+ "//absl/time",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "randen_engine_test",
+ size = "medium",
+ srcs = [
+ "randen_engine_test.cc",
+ ],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":explicit_seed_seq",
+ ":randen_engine",
+ "//absl/base:raw_logging_internal",
+ "//absl/strings",
+ "//absl/time",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "randen_test",
+ size = "small",
+ srcs = ["randen_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":randen",
+ "//absl/meta:type_traits",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "randen_slow_test",
+ size = "small",
+ srcs = ["randen_slow_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":platform",
+ ":randen_slow",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "randen_hwaes_test",
+ size = "small",
+ srcs = ["randen_hwaes_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ tags = ABSL_RANDOM_NONPORTABLE_TAGS,
+ deps = [
+ ":platform",
+ ":randen_hwaes",
+ ":randen_hwaes_impl", # build_cleaner: keep
+ "//absl/base:raw_logging_internal",
+ "//absl/strings:str_format",
+ "@com_google_googletest//:gtest",
+ ],
+)
+
+cc_test(
+ name = "wide_multiply_test",
+ size = "small",
+ srcs = ["wide_multiply_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":wide_multiply",
+ "//absl/base:bits",
+ "//absl/numeric:int128",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_library(
+ name = "nanobenchmark",
+ srcs = ["nanobenchmark.cc"],
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ textual_hdrs = ["nanobenchmark.h"],
+ deps = [
+ ":platform",
+ ":randen_engine",
+ "//absl/base:config",
+ "//absl/base:core_headers",
+ "//absl/base:raw_logging_internal",
+ ],
+)
+
+cc_library(
+ name = "uniform_helper",
+ hdrs = ["uniform_helper.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":traits",
+ "//absl/base:config",
+ "//absl/meta:type_traits",
+ ],
+)
+
+cc_test(
+ name = "nanobenchmark_test",
+ size = "small",
+ srcs = ["nanobenchmark_test.cc"],
+ flaky = 1,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ tags = [
+ "benchmark",
+ "no_test_ios_x86_64",
+ "no_test_loonix", # Crashing.
+ ],
+ deps = [
+ ":nanobenchmark",
+ "//absl/base:raw_logging_internal",
+ "//absl/strings",
+ ],
+)
+
+cc_test(
+ name = "randen_benchmarks",
+ size = "medium",
+ timeout = "long",
+ srcs = ["randen_benchmarks.cc"],
+ copts = ABSL_TEST_COPTS + ABSL_RANDOM_RANDEN_COPTS,
+ flaky = 1,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ tags = ABSL_RANDOM_NONPORTABLE_TAGS + ["benchmark"],
+ deps = [
+ ":nanobenchmark",
+ ":platform",
+ ":randen",
+ ":randen_engine",
+ ":randen_hwaes",
+ ":randen_hwaes_impl",
+ ":randen_slow",
+ "//absl/base:raw_logging_internal",
+ "//absl/strings",
+ ],
+)
+
+cc_test(
+ name = "iostream_state_saver_test",
+ size = "small",
+ srcs = ["iostream_state_saver_test.cc"],
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":iostream_state_saver",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "uniform_helper_test",
+ size = "small",
+ srcs = ["uniform_helper_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":uniform_helper",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
diff --git a/third_party/abseil/src/absl/random/internal/chi_square.cc b/third_party/abseil/src/absl/random/internal/chi_square.cc
new file mode 100644
index 0000000..640d48c
--- /dev/null
+++ b/third_party/abseil/src/absl/random/internal/chi_square.cc
@@ -0,0 +1,232 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/random/internal/chi_square.h"
+
+#include <cmath>
+
+#include "absl/random/internal/distribution_test_util.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace random_internal {
+namespace {
+
+#if defined(__EMSCRIPTEN__)
+// Workaround __EMSCRIPTEN__ error: llvm_fma_f64 not found.
+inline double fma(double x, double y, double z) {
+ return (x * y) + z;
+}
+#endif
+
+// Use Horner's method to evaluate a polynomial.
+template <typename T, unsigned N>
+inline T EvaluatePolynomial(T x, const T (&poly)[N]) {
+#if !defined(__EMSCRIPTEN__)
+ using std::fma;
+#endif
+ T p = poly[N - 1];
+ for (unsigned i = 2; i <= N; i++) {
+ p = fma(p, x, poly[N - i]);
+ }
+ return p;
+}
+
+static constexpr int kLargeDOF = 150;
+
+// Returns the probability of a normal z-value.
+//
+// Adapted from the POZ function in:
+// Ibbetson D, Algorithm 209
+// Collected Algorithms of the CACM 1963 p. 616
+//
+double POZ(double z) {
+ static constexpr double kP1[] = {
+ 0.797884560593, -0.531923007300, 0.319152932694,
+ -0.151968751364, 0.059054035642, -0.019198292004,
+ 0.005198775019, -0.001075204047, 0.000124818987,
+ };
+ static constexpr double kP2[] = {
+ 0.999936657524, 0.000535310849, -0.002141268741, 0.005353579108,
+ -0.009279453341, 0.011630447319, -0.010557625006, 0.006549791214,
+ -0.002034254874, -0.000794620820, 0.001390604284, -0.000676904986,
+ -0.000019538132, 0.000152529290, -0.000045255659,
+ };
+
+ const double kZMax = 6.0; // Maximum meaningful z-value.
+ if (z == 0.0) {
+ return 0.5;
+ }
+ double x;
+ double y = 0.5 * std::fabs(z);
+ if (y >= (kZMax * 0.5)) {
+ x = 1.0;
+ } else if (y < 1.0) {
+ double w = y * y;
+ x = EvaluatePolynomial(w, kP1) * y * 2.0;
+ } else {
+ y -= 2.0;
+ x = EvaluatePolynomial(y, kP2);
+ }
+ return z > 0.0 ? ((x + 1.0) * 0.5) : ((1.0 - x) * 0.5);
+}
+
+// Approximates the survival function of the normal distribution.
+//
+// Algorithm 26.2.18, from:
+// [Abramowitz and Stegun, Handbook of Mathematical Functions,p.932]
+// http://people.math.sfu.ca/~cbm/aands/abramowitz_and_stegun.pdf
+//
+double normal_survival(double z) {
+ // Maybe replace with the alternate formulation.
+ // 0.5 * erfc((x - mean)/(sqrt(2) * sigma))
+ static constexpr double kR[] = {
+ 1.0, 0.196854, 0.115194, 0.000344, 0.019527,
+ };
+ double r = EvaluatePolynomial(z, kR);
+ r *= r;
+ return 0.5 / (r * r);
+}
+
+} // namespace
+
+// Calculates the critical chi-square value given degrees-of-freedom and a
+// p-value, usually using bisection. Also known by the name CRITCHI.
+double ChiSquareValue(int dof, double p) {
+ static constexpr double kChiEpsilon =
+ 0.000001; // Accuracy of the approximation.
+ static constexpr double kChiMax =
+ 99999.0; // Maximum chi-squared value.
+
+ const double p_value = 1.0 - p;
+ if (dof < 1 || p_value > 1.0) {
+ return 0.0;
+ }
+
+ if (dof > kLargeDOF) {
+ // For large degrees of freedom, use the normal approximation by
+ // Wilson, E. B. and Hilferty, M. M. (1931)
+ // chi^2 - mean
+ // Z = --------------
+ // stddev
+ const double z = InverseNormalSurvival(p_value);
+ const double mean = 1 - 2.0 / (9 * dof);
+ const double variance = 2.0 / (9 * dof);
+ // Cannot use this method if the variance is 0.
+ if (variance != 0) {
+ return std::pow(z * std::sqrt(variance) + mean, 3.0) * dof;
+ }
+ }
+
+ if (p_value <= 0.0) return kChiMax;
+
+ // Otherwise search for the p value by bisection
+ double min_chisq = 0.0;
+ double max_chisq = kChiMax;
+ double current = dof / std::sqrt(p_value);
+ while ((max_chisq - min_chisq) > kChiEpsilon) {
+ if (ChiSquarePValue(current, dof) < p_value) {
+ max_chisq = current;
+ } else {
+ min_chisq = current;
+ }
+ current = (max_chisq + min_chisq) * 0.5;
+ }
+ return current;
+}
+
+// Calculates the p-value (probability) of a given chi-square value
+// and degrees of freedom.
+//
+// Adapted from the POCHISQ function from:
+// Hill, I. D. and Pike, M. C. Algorithm 299
+// Collected Algorithms of the CACM 1963 p. 243
+//
+double ChiSquarePValue(double chi_square, int dof) {
+ static constexpr double kLogSqrtPi =
+ 0.5723649429247000870717135; // Log[Sqrt[Pi]]
+ static constexpr double kInverseSqrtPi =
+ 0.5641895835477562869480795; // 1/(Sqrt[Pi])
+
+ // For large degrees of freedom, use the normal approximation by
+ // Wilson, E. B. and Hilferty, M. M. (1931)
+ // Via Wikipedia:
+ // By the Central Limit Theorem, because the chi-square distribution is the
+ // sum of k independent random variables with finite mean and variance, it
+ // converges to a normal distribution for large k.
+ if (dof > kLargeDOF) {
+ // Re-scale everything.
+ const double chi_square_scaled = std::pow(chi_square / dof, 1.0 / 3);
+ const double mean = 1 - 2.0 / (9 * dof);
+ const double variance = 2.0 / (9 * dof);
+ // If variance is 0, this method cannot be used.
+ if (variance != 0) {
+ const double z = (chi_square_scaled - mean) / std::sqrt(variance);
+ if (z > 0) {
+ return normal_survival(z);
+ } else if (z < 0) {
+ return 1.0 - normal_survival(-z);
+ } else {
+ return 0.5;
+ }
+ }
+ }
+
+ // The chi square function is >= 0 for any degrees of freedom.
+ // In other words, probability that the chi square function >= 0 is 1.
+ if (chi_square <= 0.0) return 1.0;
+
+ // If the degrees of freedom is zero, the chi square function is always 0 by
+ // definition. In other words, the probability that the chi square function
+ // is > 0 is zero (chi square values <= 0 have been filtered above).
+ if (dof < 1) return 0;
+
+ auto capped_exp = [](double x) { return x < -20 ? 0.0 : std::exp(x); };
+ static constexpr double kBigX = 20;
+
+ double a = 0.5 * chi_square;
+ const bool even = !(dof & 1); // True if dof is an even number.
+ const double y = capped_exp(-a);
+ double s = even ? y : (2.0 * POZ(-std::sqrt(chi_square)));
+
+ if (dof <= 2) {
+ return s;
+ }
+
+ chi_square = 0.5 * (dof - 1.0);
+ double z = (even ? 1.0 : 0.5);
+ if (a > kBigX) {
+ double e = (even ? 0.0 : kLogSqrtPi);
+ double c = std::log(a);
+ while (z <= chi_square) {
+ e = std::log(z) + e;
+ s += capped_exp(c * z - a - e);
+ z += 1.0;
+ }
+ return s;
+ }
+
+ double e = (even ? 1.0 : (kInverseSqrtPi / std::sqrt(a)));
+ double c = 0.0;
+ while (z <= chi_square) {
+ e = e * (a / z);
+ c = c + e;
+ z += 1.0;
+ }
+ return c * y + s;
+}
+
+} // namespace random_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/random/internal/chi_square.h b/third_party/abseil/src/absl/random/internal/chi_square.h
new file mode 100644
index 0000000..07f4fbe
--- /dev/null
+++ b/third_party/abseil/src/absl/random/internal/chi_square.h
@@ -0,0 +1,89 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_RANDOM_INTERNAL_CHI_SQUARE_H_
+#define ABSL_RANDOM_INTERNAL_CHI_SQUARE_H_
+
+// The chi-square statistic.
+//
+// Useful for evaluating if `D` independent random variables are behaving as
+// expected, or if two distributions are similar. (`D` is the degrees of
+// freedom).
+//
+// Each bucket should have an expected count of 10 or more for the chi square to
+// be meaningful.
+
+#include <cassert>
+
+#include "absl/base/config.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace random_internal {
+
+constexpr const char kChiSquared[] = "chi-squared";
+
+// Returns the measured chi square value, using a single expected value. This
+// assumes that the values in [begin, end) are uniformly distributed.
+template <typename Iterator>
+double ChiSquareWithExpected(Iterator begin, Iterator end, double expected) {
+ // Compute the sum and the number of buckets.
+ assert(expected >= 10); // require at least 10 samples per bucket.
+ double chi_square = 0;
+ for (auto it = begin; it != end; it++) {
+ double d = static_cast<double>(*it) - expected;
+ chi_square += d * d;
+ }
+ chi_square = chi_square / expected;
+ return chi_square;
+}
+
+// Returns the measured chi square value, taking the actual value of each bucket
+// from the first set of iterators, and the expected value of each bucket from
+// the second set of iterators.
+template <typename Iterator, typename Expected>
+double ChiSquare(Iterator it, Iterator end, Expected eit, Expected eend) {
+ double chi_square = 0;
+ for (; it != end && eit != eend; ++it, ++eit) {
+ if (*it > 0) {
+ assert(*eit > 0);
+ }
+ double e = static_cast<double>(*eit);
+ double d = static_cast<double>(*it - *eit);
+ if (d != 0) {
+ assert(e > 0);
+ chi_square += (d * d) / e;
+ }
+ }
+ assert(it == end && eit == eend);
+ return chi_square;
+}
+
+// ======================================================================
+// The following methods can be used for an arbitrary significance level.
+//
+
+// Calculates critical chi-square values to produce the given p-value using a
+// bisection search for a value within epsilon, relying on the monotonicity of
+// ChiSquarePValue().
+double ChiSquareValue(int dof, double p);
+
+// Calculates the p-value (probability) of a given chi-square value.
+double ChiSquarePValue(double chi_square, int dof);
+
+} // namespace random_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_RANDOM_INTERNAL_CHI_SQUARE_H_
diff --git a/third_party/abseil/src/absl/random/internal/chi_square_test.cc b/third_party/abseil/src/absl/random/internal/chi_square_test.cc
new file mode 100644
index 0000000..5025def
--- /dev/null
+++ b/third_party/abseil/src/absl/random/internal/chi_square_test.cc
@@ -0,0 +1,365 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/random/internal/chi_square.h"
+
+#include <algorithm>
+#include <cstddef>
+#include <cstdint>
+#include <iterator>
+#include <numeric>
+#include <vector>
+
+#include "gtest/gtest.h"
+#include "absl/base/macros.h"
+
+using absl::random_internal::ChiSquare;
+using absl::random_internal::ChiSquarePValue;
+using absl::random_internal::ChiSquareValue;
+using absl::random_internal::ChiSquareWithExpected;
+
+namespace {
+
+TEST(ChiSquare, Value) {
+ struct {
+ int line;
+ double chi_square;
+ int df;
+ double confidence;
+ } const specs[] = {
+ // Testing lookup at 1% confidence
+ {__LINE__, 0, 0, 0.01},
+ {__LINE__, 0.00016, 1, 0.01},
+ {__LINE__, 1.64650, 8, 0.01},
+ {__LINE__, 5.81221, 16, 0.01},
+ {__LINE__, 156.4319, 200, 0.01},
+ {__LINE__, 1121.3784, 1234, 0.01},
+ {__LINE__, 53557.1629, 54321, 0.01},
+ {__LINE__, 651662.6647, 654321, 0.01},
+
+ // Testing lookup at 99% confidence
+ {__LINE__, 0, 0, 0.99},
+ {__LINE__, 6.635, 1, 0.99},
+ {__LINE__, 20.090, 8, 0.99},
+ {__LINE__, 32.000, 16, 0.99},
+ {__LINE__, 249.4456, 200, 0.99},
+ {__LINE__, 1131.1573, 1023, 0.99},
+ {__LINE__, 1352.5038, 1234, 0.99},
+ {__LINE__, 55090.7356, 54321, 0.99},
+ {__LINE__, 656985.1514, 654321, 0.99},
+
+ // Testing lookup at 99.9% confidence
+ {__LINE__, 16.2659, 3, 0.999},
+ {__LINE__, 22.4580, 6, 0.999},
+ {__LINE__, 267.5409, 200, 0.999},
+ {__LINE__, 1168.5033, 1023, 0.999},
+ {__LINE__, 55345.1741, 54321, 0.999},
+ {__LINE__, 657861.7284, 654321, 0.999},
+ {__LINE__, 51.1772, 24, 0.999},
+ {__LINE__, 59.7003, 30, 0.999},
+ {__LINE__, 37.6984, 15, 0.999},
+ {__LINE__, 29.5898, 10, 0.999},
+ {__LINE__, 27.8776, 9, 0.999},
+
+ // Testing lookup at random confidences
+ {__LINE__, 0.000157088, 1, 0.01},
+ {__LINE__, 5.31852, 2, 0.93},
+ {__LINE__, 1.92256, 4, 0.25},
+ {__LINE__, 10.7709, 13, 0.37},
+ {__LINE__, 26.2514, 17, 0.93},
+ {__LINE__, 36.4799, 29, 0.84},
+ {__LINE__, 25.818, 31, 0.27},
+ {__LINE__, 63.3346, 64, 0.50},
+ {__LINE__, 196.211, 128, 0.9999},
+ {__LINE__, 215.21, 243, 0.10},
+ {__LINE__, 285.393, 256, 0.90},
+ {__LINE__, 984.504, 1024, 0.1923},
+ {__LINE__, 2043.85, 2048, 0.4783},
+ {__LINE__, 48004.6, 48273, 0.194},
+ };
+ for (const auto& spec : specs) {
+ SCOPED_TRACE(spec.line);
+ // Verify all values are have at most a 1% relative error.
+ const double val = ChiSquareValue(spec.df, spec.confidence);
+ const double err = std::max(5e-6, spec.chi_square / 5e3); // 1 part in 5000
+ EXPECT_NEAR(spec.chi_square, val, err) << spec.line;
+ }
+
+ // Relaxed test for extreme values, from
+ // http://www.ciphersbyritter.com/JAVASCRP/NORMCHIK.HTM#ChiSquare
+ EXPECT_NEAR(49.2680, ChiSquareValue(100, 1e-6), 5); // 0.000'005 mark
+ EXPECT_NEAR(123.499, ChiSquareValue(200, 1e-6), 5); // 0.000'005 mark
+
+ EXPECT_NEAR(149.449, ChiSquareValue(100, 0.999), 0.01);
+ EXPECT_NEAR(161.318, ChiSquareValue(100, 0.9999), 0.01);
+ EXPECT_NEAR(172.098, ChiSquareValue(100, 0.99999), 0.01);
+
+ EXPECT_NEAR(381.426, ChiSquareValue(300, 0.999), 0.05);
+ EXPECT_NEAR(399.756, ChiSquareValue(300, 0.9999), 0.1);
+ EXPECT_NEAR(416.126, ChiSquareValue(300, 0.99999), 0.2);
+}
+
+TEST(ChiSquareTest, PValue) {
+ struct {
+ int line;
+ double pval;
+ double chi_square;
+ int df;
+ } static const specs[] = {
+ {__LINE__, 1, 0, 0},
+ {__LINE__, 0, 0.001, 0},
+ {__LINE__, 1.000, 0, 453},
+ {__LINE__, 0.134471, 7972.52, 7834},
+ {__LINE__, 0.203922, 28.32, 23},
+ {__LINE__, 0.737171, 48274, 48472},
+ {__LINE__, 0.444146, 583.1234, 579},
+ {__LINE__, 0.294814, 138.2, 130},
+ {__LINE__, 0.0816532, 12.63, 7},
+ {__LINE__, 0, 682.32, 67},
+ {__LINE__, 0.49405, 999, 999},
+ {__LINE__, 1.000, 0, 9999},
+ {__LINE__, 0.997477, 0.00001, 1},
+ {__LINE__, 0, 5823.21, 5040},
+ };
+ for (const auto& spec : specs) {
+ SCOPED_TRACE(spec.line);
+ const double pval = ChiSquarePValue(spec.chi_square, spec.df);
+ EXPECT_NEAR(spec.pval, pval, 1e-3);
+ }
+}
+
+TEST(ChiSquareTest, CalcChiSquare) {
+ struct {
+ int line;
+ std::vector<int> expected;
+ std::vector<int> actual;
+ } const specs[] = {
+ {__LINE__,
+ {56, 234, 76, 1, 546, 1, 87, 345, 1, 234},
+ {2, 132, 4, 43, 234, 8, 345, 8, 236, 56}},
+ {__LINE__,
+ {123, 36, 234, 367, 345, 2, 456, 567, 234, 567},
+ {123, 56, 2345, 8, 345, 8, 2345, 23, 48, 267}},
+ {__LINE__,
+ {123, 234, 345, 456, 567, 678, 789, 890, 98, 76},
+ {123, 234, 345, 456, 567, 678, 789, 890, 98, 76}},
+ {__LINE__, {3, 675, 23, 86, 2, 8, 2}, {456, 675, 23, 86, 23, 65, 2}},
+ {__LINE__, {1}, {23}},
+ };
+ for (const auto& spec : specs) {
+ SCOPED_TRACE(spec.line);
+ double chi_square = 0;
+ for (int i = 0; i < spec.expected.size(); ++i) {
+ const double diff = spec.actual[i] - spec.expected[i];
+ chi_square += (diff * diff) / spec.expected[i];
+ }
+ EXPECT_NEAR(chi_square,
+ ChiSquare(std::begin(spec.actual), std::end(spec.actual),
+ std::begin(spec.expected), std::end(spec.expected)),
+ 1e-5);
+ }
+}
+
+TEST(ChiSquareTest, CalcChiSquareInt64) {
+ const int64_t data[3] = {910293487, 910292491, 910216780};
+ // $ python -c "import scipy.stats
+ // > print scipy.stats.chisquare([910293487, 910292491, 910216780])[0]"
+ // 4.25410123524
+ double sum = std::accumulate(std::begin(data), std::end(data), double{0});
+ size_t n = std::distance(std::begin(data), std::end(data));
+ double a = ChiSquareWithExpected(std::begin(data), std::end(data), sum / n);
+ EXPECT_NEAR(4.254101, a, 1e-6);
+
+ // ... Or with known values.
+ double b =
+ ChiSquareWithExpected(std::begin(data), std::end(data), 910267586.0);
+ EXPECT_NEAR(4.254101, b, 1e-6);
+}
+
+TEST(ChiSquareTest, TableData) {
+ // Test data from
+ // http://www.itl.nist.gov/div898/handbook/eda/section3/eda3674.htm
+ // 0.90 0.95 0.975 0.99 0.999
+ const double data[100][5] = {
+ /* 1*/ {2.706, 3.841, 5.024, 6.635, 10.828},
+ /* 2*/ {4.605, 5.991, 7.378, 9.210, 13.816},
+ /* 3*/ {6.251, 7.815, 9.348, 11.345, 16.266},
+ /* 4*/ {7.779, 9.488, 11.143, 13.277, 18.467},
+ /* 5*/ {9.236, 11.070, 12.833, 15.086, 20.515},
+ /* 6*/ {10.645, 12.592, 14.449, 16.812, 22.458},
+ /* 7*/ {12.017, 14.067, 16.013, 18.475, 24.322},
+ /* 8*/ {13.362, 15.507, 17.535, 20.090, 26.125},
+ /* 9*/ {14.684, 16.919, 19.023, 21.666, 27.877},
+ /*10*/ {15.987, 18.307, 20.483, 23.209, 29.588},
+ /*11*/ {17.275, 19.675, 21.920, 24.725, 31.264},
+ /*12*/ {18.549, 21.026, 23.337, 26.217, 32.910},
+ /*13*/ {19.812, 22.362, 24.736, 27.688, 34.528},
+ /*14*/ {21.064, 23.685, 26.119, 29.141, 36.123},
+ /*15*/ {22.307, 24.996, 27.488, 30.578, 37.697},
+ /*16*/ {23.542, 26.296, 28.845, 32.000, 39.252},
+ /*17*/ {24.769, 27.587, 30.191, 33.409, 40.790},
+ /*18*/ {25.989, 28.869, 31.526, 34.805, 42.312},
+ /*19*/ {27.204, 30.144, 32.852, 36.191, 43.820},
+ /*20*/ {28.412, 31.410, 34.170, 37.566, 45.315},
+ /*21*/ {29.615, 32.671, 35.479, 38.932, 46.797},
+ /*22*/ {30.813, 33.924, 36.781, 40.289, 48.268},
+ /*23*/ {32.007, 35.172, 38.076, 41.638, 49.728},
+ /*24*/ {33.196, 36.415, 39.364, 42.980, 51.179},
+ /*25*/ {34.382, 37.652, 40.646, 44.314, 52.620},
+ /*26*/ {35.563, 38.885, 41.923, 45.642, 54.052},
+ /*27*/ {36.741, 40.113, 43.195, 46.963, 55.476},
+ /*28*/ {37.916, 41.337, 44.461, 48.278, 56.892},
+ /*29*/ {39.087, 42.557, 45.722, 49.588, 58.301},
+ /*30*/ {40.256, 43.773, 46.979, 50.892, 59.703},
+ /*31*/ {41.422, 44.985, 48.232, 52.191, 61.098},
+ /*32*/ {42.585, 46.194, 49.480, 53.486, 62.487},
+ /*33*/ {43.745, 47.400, 50.725, 54.776, 63.870},
+ /*34*/ {44.903, 48.602, 51.966, 56.061, 65.247},
+ /*35*/ {46.059, 49.802, 53.203, 57.342, 66.619},
+ /*36*/ {47.212, 50.998, 54.437, 58.619, 67.985},
+ /*37*/ {48.363, 52.192, 55.668, 59.893, 69.347},
+ /*38*/ {49.513, 53.384, 56.896, 61.162, 70.703},
+ /*39*/ {50.660, 54.572, 58.120, 62.428, 72.055},
+ /*40*/ {51.805, 55.758, 59.342, 63.691, 73.402},
+ /*41*/ {52.949, 56.942, 60.561, 64.950, 74.745},
+ /*42*/ {54.090, 58.124, 61.777, 66.206, 76.084},
+ /*43*/ {55.230, 59.304, 62.990, 67.459, 77.419},
+ /*44*/ {56.369, 60.481, 64.201, 68.710, 78.750},
+ /*45*/ {57.505, 61.656, 65.410, 69.957, 80.077},
+ /*46*/ {58.641, 62.830, 66.617, 71.201, 81.400},
+ /*47*/ {59.774, 64.001, 67.821, 72.443, 82.720},
+ /*48*/ {60.907, 65.171, 69.023, 73.683, 84.037},
+ /*49*/ {62.038, 66.339, 70.222, 74.919, 85.351},
+ /*50*/ {63.167, 67.505, 71.420, 76.154, 86.661},
+ /*51*/ {64.295, 68.669, 72.616, 77.386, 87.968},
+ /*52*/ {65.422, 69.832, 73.810, 78.616, 89.272},
+ /*53*/ {66.548, 70.993, 75.002, 79.843, 90.573},
+ /*54*/ {67.673, 72.153, 76.192, 81.069, 91.872},
+ /*55*/ {68.796, 73.311, 77.380, 82.292, 93.168},
+ /*56*/ {69.919, 74.468, 78.567, 83.513, 94.461},
+ /*57*/ {71.040, 75.624, 79.752, 84.733, 95.751},
+ /*58*/ {72.160, 76.778, 80.936, 85.950, 97.039},
+ /*59*/ {73.279, 77.931, 82.117, 87.166, 98.324},
+ /*60*/ {74.397, 79.082, 83.298, 88.379, 99.607},
+ /*61*/ {75.514, 80.232, 84.476, 89.591, 100.888},
+ /*62*/ {76.630, 81.381, 85.654, 90.802, 102.166},
+ /*63*/ {77.745, 82.529, 86.830, 92.010, 103.442},
+ /*64*/ {78.860, 83.675, 88.004, 93.217, 104.716},
+ /*65*/ {79.973, 84.821, 89.177, 94.422, 105.988},
+ /*66*/ {81.085, 85.965, 90.349, 95.626, 107.258},
+ /*67*/ {82.197, 87.108, 91.519, 96.828, 108.526},
+ /*68*/ {83.308, 88.250, 92.689, 98.028, 109.791},
+ /*69*/ {84.418, 89.391, 93.856, 99.228, 111.055},
+ /*70*/ {85.527, 90.531, 95.023, 100.425, 112.317},
+ /*71*/ {86.635, 91.670, 96.189, 101.621, 113.577},
+ /*72*/ {87.743, 92.808, 97.353, 102.816, 114.835},
+ /*73*/ {88.850, 93.945, 98.516, 104.010, 116.092},
+ /*74*/ {89.956, 95.081, 99.678, 105.202, 117.346},
+ /*75*/ {91.061, 96.217, 100.839, 106.393, 118.599},
+ /*76*/ {92.166, 97.351, 101.999, 107.583, 119.850},
+ /*77*/ {93.270, 98.484, 103.158, 108.771, 121.100},
+ /*78*/ {94.374, 99.617, 104.316, 109.958, 122.348},
+ /*79*/ {95.476, 100.749, 105.473, 111.144, 123.594},
+ /*80*/ {96.578, 101.879, 106.629, 112.329, 124.839},
+ /*81*/ {97.680, 103.010, 107.783, 113.512, 126.083},
+ /*82*/ {98.780, 104.139, 108.937, 114.695, 127.324},
+ /*83*/ {99.880, 105.267, 110.090, 115.876, 128.565},
+ /*84*/ {100.980, 106.395, 111.242, 117.057, 129.804},
+ /*85*/ {102.079, 107.522, 112.393, 118.236, 131.041},
+ /*86*/ {103.177, 108.648, 113.544, 119.414, 132.277},
+ /*87*/ {104.275, 109.773, 114.693, 120.591, 133.512},
+ /*88*/ {105.372, 110.898, 115.841, 121.767, 134.746},
+ /*89*/ {106.469, 112.022, 116.989, 122.942, 135.978},
+ /*90*/ {107.565, 113.145, 118.136, 124.116, 137.208},
+ /*91*/ {108.661, 114.268, 119.282, 125.289, 138.438},
+ /*92*/ {109.756, 115.390, 120.427, 126.462, 139.666},
+ /*93*/ {110.850, 116.511, 121.571, 127.633, 140.893},
+ /*94*/ {111.944, 117.632, 122.715, 128.803, 142.119},
+ /*95*/ {113.038, 118.752, 123.858, 129.973, 143.344},
+ /*96*/ {114.131, 119.871, 125.000, 131.141, 144.567},
+ /*97*/ {115.223, 120.990, 126.141, 132.309, 145.789},
+ /*98*/ {116.315, 122.108, 127.282, 133.476, 147.010},
+ /*99*/ {117.407, 123.225, 128.422, 134.642, 148.230},
+ /*100*/ {118.498, 124.342, 129.561, 135.807, 149.449}
+ /**/};
+
+ // 0.90 0.95 0.975 0.99 0.999
+ for (int i = 0; i < ABSL_ARRAYSIZE(data); i++) {
+ const double E = 0.0001;
+ EXPECT_NEAR(ChiSquarePValue(data[i][0], i + 1), 0.10, E)
+ << i << " " << data[i][0];
+ EXPECT_NEAR(ChiSquarePValue(data[i][1], i + 1), 0.05, E)
+ << i << " " << data[i][1];
+ EXPECT_NEAR(ChiSquarePValue(data[i][2], i + 1), 0.025, E)
+ << i << " " << data[i][2];
+ EXPECT_NEAR(ChiSquarePValue(data[i][3], i + 1), 0.01, E)
+ << i << " " << data[i][3];
+ EXPECT_NEAR(ChiSquarePValue(data[i][4], i + 1), 0.001, E)
+ << i << " " << data[i][4];
+
+ const double F = 0.1;
+ EXPECT_NEAR(ChiSquareValue(i + 1, 0.90), data[i][0], F) << i;
+ EXPECT_NEAR(ChiSquareValue(i + 1, 0.95), data[i][1], F) << i;
+ EXPECT_NEAR(ChiSquareValue(i + 1, 0.975), data[i][2], F) << i;
+ EXPECT_NEAR(ChiSquareValue(i + 1, 0.99), data[i][3], F) << i;
+ EXPECT_NEAR(ChiSquareValue(i + 1, 0.999), data[i][4], F) << i;
+ }
+}
+
+TEST(ChiSquareTest, ChiSquareTwoIterator) {
+ // Test data from http://www.stat.yale.edu/Courses/1997-98/101/chigf.htm
+ // Null-hypothesis: This data is normally distributed.
+ const int counts[10] = {6, 6, 18, 33, 38, 38, 28, 21, 9, 3};
+ const double expected[10] = {4.6, 8.8, 18.4, 30.0, 38.2,
+ 38.2, 30.0, 18.4, 8.8, 4.6};
+ double chi_square = ChiSquare(std::begin(counts), std::end(counts),
+ std::begin(expected), std::end(expected));
+ EXPECT_NEAR(chi_square, 2.69, 0.001);
+
+ // Degrees of freedom: 10 bins. two estimated parameters. = 10 - 2 - 1.
+ const int dof = 7;
+ // The critical value of 7, 95% => 14.067 (see above test)
+ double p_value_05 = ChiSquarePValue(14.067, dof);
+ EXPECT_NEAR(p_value_05, 0.05, 0.001); // 95%-ile p-value
+
+ double p_actual = ChiSquarePValue(chi_square, dof);
+ EXPECT_GT(p_actual, 0.05); // Accept the null hypothesis.
+}
+
+TEST(ChiSquareTest, DiceRolls) {
+ // Assume we are testing 102 fair dice rolls.
+ // Null-hypothesis: This data is fairly distributed.
+ //
+ // The dof value of 4, @95% = 9.488 (see above test)
+ // The dof value of 5, @95% = 11.070
+ const int rolls[6] = {22, 11, 17, 14, 20, 18};
+ double sum = std::accumulate(std::begin(rolls), std::end(rolls), double{0});
+ size_t n = std::distance(std::begin(rolls), std::end(rolls));
+
+ double a = ChiSquareWithExpected(std::begin(rolls), std::end(rolls), sum / n);
+ EXPECT_NEAR(a, 4.70588, 1e-5);
+ EXPECT_LT(a, ChiSquareValue(4, 0.95));
+
+ double p_a = ChiSquarePValue(a, 4);
+ EXPECT_NEAR(p_a, 0.318828, 1e-5); // Accept the null hypothesis.
+
+ double b = ChiSquareWithExpected(std::begin(rolls), std::end(rolls), 17.0);
+ EXPECT_NEAR(b, 4.70588, 1e-5);
+ EXPECT_LT(b, ChiSquareValue(5, 0.95));
+
+ double p_b = ChiSquarePValue(b, 5);
+ EXPECT_NEAR(p_b, 0.4528180, 1e-5); // Accept the null hypothesis.
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/random/internal/distribution_caller.h b/third_party/abseil/src/absl/random/internal/distribution_caller.h
new file mode 100644
index 0000000..fc81b78
--- /dev/null
+++ b/third_party/abseil/src/absl/random/internal/distribution_caller.h
@@ -0,0 +1,92 @@
+//
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+#ifndef ABSL_RANDOM_INTERNAL_DISTRIBUTION_CALLER_H_
+#define ABSL_RANDOM_INTERNAL_DISTRIBUTION_CALLER_H_
+
+#include <utility>
+
+#include "absl/base/config.h"
+#include "absl/base/internal/fast_type_id.h"
+#include "absl/utility/utility.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace random_internal {
+
+// DistributionCaller provides an opportunity to overload the general
+// mechanism for calling a distribution, allowing for mock-RNG classes
+// to intercept such calls.
+template <typename URBG>
+struct DistributionCaller {
+ // SFINAE to detect whether the URBG type includes a member matching
+ // bool InvokeMock(base_internal::FastTypeIdType, void*, void*).
+ //
+ // These live inside BitGenRef so that they have friend access
+ // to MockingBitGen. (see similar methods in DistributionCaller).
+ template <template <class...> class Trait, class AlwaysVoid, class... Args>
+ struct detector : std::false_type {};
+ template <template <class...> class Trait, class... Args>
+ struct detector<Trait, absl::void_t<Trait<Args...>>, Args...>
+ : std::true_type {};
+
+ template <class T>
+ using invoke_mock_t = decltype(std::declval<T*>()->InvokeMock(
+ std::declval<::absl::base_internal::FastTypeIdType>(),
+ std::declval<void*>(), std::declval<void*>()));
+
+ using HasInvokeMock = typename detector<invoke_mock_t, void, URBG>::type;
+
+ // Default implementation of distribution caller.
+ template <typename DistrT, typename... Args>
+ static typename DistrT::result_type Impl(std::false_type, URBG* urbg,
+ Args&&... args) {
+ DistrT dist(std::forward<Args>(args)...);
+ return dist(*urbg);
+ }
+
+ // Mock implementation of distribution caller.
+ // The underlying KeyT must match the KeyT constructed by MockOverloadSet.
+ template <typename DistrT, typename... Args>
+ static typename DistrT::result_type Impl(std::true_type, URBG* urbg,
+ Args&&... args) {
+ using ResultT = typename DistrT::result_type;
+ using ArgTupleT = std::tuple<absl::decay_t<Args>...>;
+ using KeyT = ResultT(DistrT, ArgTupleT);
+
+ ArgTupleT arg_tuple(std::forward<Args>(args)...);
+ ResultT result;
+ if (!urbg->InvokeMock(::absl::base_internal::FastTypeId<KeyT>(), &arg_tuple,
+ &result)) {
+ auto dist = absl::make_from_tuple<DistrT>(arg_tuple);
+ result = dist(*urbg);
+ }
+ return result;
+ }
+
+ // Default implementation of distribution caller.
+ template <typename DistrT, typename... Args>
+ static typename DistrT::result_type Call(URBG* urbg, Args&&... args) {
+ return Impl<DistrT, Args...>(HasInvokeMock{}, urbg,
+ std::forward<Args>(args)...);
+ }
+};
+
+} // namespace random_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_RANDOM_INTERNAL_DISTRIBUTION_CALLER_H_
diff --git a/third_party/abseil/src/absl/random/internal/distribution_test_util.cc b/third_party/abseil/src/absl/random/internal/distribution_test_util.cc
new file mode 100644
index 0000000..e900565
--- /dev/null
+++ b/third_party/abseil/src/absl/random/internal/distribution_test_util.cc
@@ -0,0 +1,418 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/random/internal/distribution_test_util.h"
+
+#include <cassert>
+#include <cmath>
+#include <string>
+#include <vector>
+
+#include "absl/base/internal/raw_logging.h"
+#include "absl/base/macros.h"
+#include "absl/strings/str_cat.h"
+#include "absl/strings/str_format.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace random_internal {
+namespace {
+
+#if defined(__EMSCRIPTEN__)
+// Workaround __EMSCRIPTEN__ error: llvm_fma_f64 not found.
+inline double fma(double x, double y, double z) { return (x * y) + z; }
+#endif
+
+} // namespace
+
+DistributionMoments ComputeDistributionMoments(
+ absl::Span<const double> data_points) {
+ DistributionMoments result;
+
+ // Compute m1
+ for (double x : data_points) {
+ result.n++;
+ result.mean += x;
+ }
+ result.mean /= static_cast<double>(result.n);
+
+ // Compute m2, m3, m4
+ for (double x : data_points) {
+ double v = x - result.mean;
+ result.variance += v * v;
+ result.skewness += v * v * v;
+ result.kurtosis += v * v * v * v;
+ }
+ result.variance /= static_cast<double>(result.n - 1);
+
+ result.skewness /= static_cast<double>(result.n);
+ result.skewness /= std::pow(result.variance, 1.5);
+
+ result.kurtosis /= static_cast<double>(result.n);
+ result.kurtosis /= std::pow(result.variance, 2.0);
+ return result;
+
+ // When validating the min/max count, the following confidence intervals may
+ // be of use:
+ // 3.291 * stddev = 99.9% CI
+ // 2.576 * stddev = 99% CI
+ // 1.96 * stddev = 95% CI
+ // 1.65 * stddev = 90% CI
+}
+
+std::ostream& operator<<(std::ostream& os, const DistributionMoments& moments) {
+ return os << absl::StrFormat("mean=%f, stddev=%f, skewness=%f, kurtosis=%f",
+ moments.mean, std::sqrt(moments.variance),
+ moments.skewness, moments.kurtosis);
+}
+
+double InverseNormalSurvival(double x) {
+ // inv_sf(u) = -sqrt(2) * erfinv(2u-1)
+ static constexpr double kSqrt2 = 1.4142135623730950488;
+ return -kSqrt2 * absl::random_internal::erfinv(2 * x - 1.0);
+}
+
+bool Near(absl::string_view msg, double actual, double expected, double bound) {
+ assert(bound > 0.0);
+ double delta = fabs(expected - actual);
+ if (delta < bound) {
+ return true;
+ }
+
+ std::string formatted = absl::StrCat(
+ msg, " actual=", actual, " expected=", expected, " err=", delta / bound);
+ ABSL_RAW_LOG(INFO, "%s", formatted.c_str());
+ return false;
+}
+
+// TODO(absl-team): Replace with an "ABSL_HAVE_SPECIAL_MATH" and try
+// to use std::beta(). As of this writing P0226R1 is not implemented
+// in libc++: http://libcxx.llvm.org/cxx1z_status.html
+double beta(double p, double q) {
+ // Beta(x, y) = Gamma(x) * Gamma(y) / Gamma(x+y)
+ double lbeta = std::lgamma(p) + std::lgamma(q) - std::lgamma(p + q);
+ return std::exp(lbeta);
+}
+
+// Approximation to inverse of the Error Function in double precision.
+// (http://people.maths.ox.ac.uk/gilesm/files/gems_erfinv.pdf)
+double erfinv(double x) {
+#if !defined(__EMSCRIPTEN__)
+ using std::fma;
+#endif
+
+ double w = 0.0;
+ double p = 0.0;
+ w = -std::log((1.0 - x) * (1.0 + x));
+ if (w < 6.250000) {
+ w = w - 3.125000;
+ p = -3.6444120640178196996e-21;
+ p = fma(p, w, -1.685059138182016589e-19);
+ p = fma(p, w, 1.2858480715256400167e-18);
+ p = fma(p, w, 1.115787767802518096e-17);
+ p = fma(p, w, -1.333171662854620906e-16);
+ p = fma(p, w, 2.0972767875968561637e-17);
+ p = fma(p, w, 6.6376381343583238325e-15);
+ p = fma(p, w, -4.0545662729752068639e-14);
+ p = fma(p, w, -8.1519341976054721522e-14);
+ p = fma(p, w, 2.6335093153082322977e-12);
+ p = fma(p, w, -1.2975133253453532498e-11);
+ p = fma(p, w, -5.4154120542946279317e-11);
+ p = fma(p, w, 1.051212273321532285e-09);
+ p = fma(p, w, -4.1126339803469836976e-09);
+ p = fma(p, w, -2.9070369957882005086e-08);
+ p = fma(p, w, 4.2347877827932403518e-07);
+ p = fma(p, w, -1.3654692000834678645e-06);
+ p = fma(p, w, -1.3882523362786468719e-05);
+ p = fma(p, w, 0.0001867342080340571352);
+ p = fma(p, w, -0.00074070253416626697512);
+ p = fma(p, w, -0.0060336708714301490533);
+ p = fma(p, w, 0.24015818242558961693);
+ p = fma(p, w, 1.6536545626831027356);
+ } else if (w < 16.000000) {
+ w = std::sqrt(w) - 3.250000;
+ p = 2.2137376921775787049e-09;
+ p = fma(p, w, 9.0756561938885390979e-08);
+ p = fma(p, w, -2.7517406297064545428e-07);
+ p = fma(p, w, 1.8239629214389227755e-08);
+ p = fma(p, w, 1.5027403968909827627e-06);
+ p = fma(p, w, -4.013867526981545969e-06);
+ p = fma(p, w, 2.9234449089955446044e-06);
+ p = fma(p, w, 1.2475304481671778723e-05);
+ p = fma(p, w, -4.7318229009055733981e-05);
+ p = fma(p, w, 6.8284851459573175448e-05);
+ p = fma(p, w, 2.4031110387097893999e-05);
+ p = fma(p, w, -0.0003550375203628474796);
+ p = fma(p, w, 0.00095328937973738049703);
+ p = fma(p, w, -0.0016882755560235047313);
+ p = fma(p, w, 0.0024914420961078508066);
+ p = fma(p, w, -0.0037512085075692412107);
+ p = fma(p, w, 0.005370914553590063617);
+ p = fma(p, w, 1.0052589676941592334);
+ p = fma(p, w, 3.0838856104922207635);
+ } else {
+ w = std::sqrt(w) - 5.000000;
+ p = -2.7109920616438573243e-11;
+ p = fma(p, w, -2.5556418169965252055e-10);
+ p = fma(p, w, 1.5076572693500548083e-09);
+ p = fma(p, w, -3.7894654401267369937e-09);
+ p = fma(p, w, 7.6157012080783393804e-09);
+ p = fma(p, w, -1.4960026627149240478e-08);
+ p = fma(p, w, 2.9147953450901080826e-08);
+ p = fma(p, w, -6.7711997758452339498e-08);
+ p = fma(p, w, 2.2900482228026654717e-07);
+ p = fma(p, w, -9.9298272942317002539e-07);
+ p = fma(p, w, 4.5260625972231537039e-06);
+ p = fma(p, w, -1.9681778105531670567e-05);
+ p = fma(p, w, 7.5995277030017761139e-05);
+ p = fma(p, w, -0.00021503011930044477347);
+ p = fma(p, w, -0.00013871931833623122026);
+ p = fma(p, w, 1.0103004648645343977);
+ p = fma(p, w, 4.8499064014085844221);
+ }
+ return p * x;
+}
+
+namespace {
+
+// Direct implementation of AS63, BETAIN()
+// https://www.jstor.org/stable/2346797?seq=3#page_scan_tab_contents.
+//
+// BETAIN(x, p, q, beta)
+// x: the value of the upper limit x.
+// p: the value of the parameter p.
+// q: the value of the parameter q.
+// beta: the value of ln B(p, q)
+//
+double BetaIncompleteImpl(const double x, const double p, const double q,
+ const double beta) {
+ if (p < (p + q) * x) {
+ // Incomplete beta function is symmetrical, so return the complement.
+ return 1. - BetaIncompleteImpl(1.0 - x, q, p, beta);
+ }
+
+ double psq = p + q;
+ const double kErr = 1e-14;
+ const double xc = 1. - x;
+ const double pre =
+ std::exp(p * std::log(x) + (q - 1.) * std::log(xc) - beta) / p;
+
+ double term = 1.;
+ double ai = 1.;
+ double result = 1.;
+ int ns = static_cast<int>(q + xc * psq);
+
+ // Use the soper reduction forumla.
+ double rx = (ns == 0) ? x : x / xc;
+ double temp = q - ai;
+ for (;;) {
+ term = term * temp * rx / (p + ai);
+ result = result + term;
+ temp = std::fabs(term);
+ if (temp < kErr && temp < kErr * result) {
+ return result * pre;
+ }
+ ai = ai + 1.;
+ --ns;
+ if (ns >= 0) {
+ temp = q - ai;
+ if (ns == 0) {
+ rx = x;
+ }
+ } else {
+ temp = psq;
+ psq = psq + 1.;
+ }
+ }
+
+ // NOTE: See also TOMS Alogrithm 708.
+ // http://www.netlib.org/toms/index.html
+ //
+ // NOTE: The NWSC library also includes BRATIO / ISUBX (p87)
+ // https://archive.org/details/DTIC_ADA261511/page/n75
+}
+
+// Direct implementation of AS109, XINBTA(p, q, beta, alpha)
+// https://www.jstor.org/stable/2346798?read-now=1&seq=4#page_scan_tab_contents
+// https://www.jstor.org/stable/2346887?seq=1#page_scan_tab_contents
+//
+// XINBTA(p, q, beta, alhpa)
+// p: the value of the parameter p.
+// q: the value of the parameter q.
+// beta: the value of ln B(p, q)
+// alpha: the value of the lower tail area.
+//
+double BetaIncompleteInvImpl(const double p, const double q, const double beta,
+ const double alpha) {
+ if (alpha < 0.5) {
+ // Inverse Incomplete beta function is symmetrical, return the complement.
+ return 1. - BetaIncompleteInvImpl(q, p, beta, 1. - alpha);
+ }
+ const double kErr = 1e-14;
+ double value = kErr;
+
+ // Compute the initial estimate.
+ {
+ double r = std::sqrt(-std::log(alpha * alpha));
+ double y =
+ r - fma(r, 0.27061, 2.30753) / fma(r, fma(r, 0.04481, 0.99229), 1.0);
+ if (p > 1. && q > 1.) {
+ r = (y * y - 3.) / 6.;
+ double s = 1. / (p + p - 1.);
+ double t = 1. / (q + q - 1.);
+ double h = 2. / s + t;
+ double w =
+ y * std::sqrt(h + r) / h - (t - s) * (r + 5. / 6. - t / (3. * h));
+ value = p / (p + q * std::exp(w + w));
+ } else {
+ r = q + q;
+ double t = 1.0 / (9. * q);
+ double u = 1.0 - t + y * std::sqrt(t);
+ t = r * (u * u * u);
+ if (t <= 0) {
+ value = 1.0 - std::exp((std::log((1.0 - alpha) * q) + beta) / q);
+ } else {
+ t = (4.0 * p + r - 2.0) / t;
+ if (t <= 1) {
+ value = std::exp((std::log(alpha * p) + beta) / p);
+ } else {
+ value = 1.0 - 2.0 / (t + 1.0);
+ }
+ }
+ }
+ }
+
+ // Solve for x using a modified newton-raphson method using the function
+ // BetaIncomplete.
+ {
+ value = std::max(value, kErr);
+ value = std::min(value, 1.0 - kErr);
+
+ const double r = 1.0 - p;
+ const double t = 1.0 - q;
+ double y;
+ double yprev = 0;
+ double sq = 1;
+ double prev = 1;
+ for (;;) {
+ if (value < 0 || value > 1.0) {
+ // Error case; value went infinite.
+ return std::numeric_limits<double>::infinity();
+ } else if (value == 0 || value == 1) {
+ y = value;
+ } else {
+ y = BetaIncompleteImpl(value, p, q, beta);
+ if (!std::isfinite(y)) {
+ return y;
+ }
+ }
+ y = (y - alpha) *
+ std::exp(beta + r * std::log(value) + t * std::log(1.0 - value));
+ if (y * yprev <= 0) {
+ prev = std::max(sq, std::numeric_limits<double>::min());
+ }
+ double g = 1.0;
+ for (;;) {
+ const double adj = g * y;
+ const double adj_sq = adj * adj;
+ if (adj_sq >= prev) {
+ g = g / 3.0;
+ continue;
+ }
+ const double tx = value - adj;
+ if (tx < 0 || tx > 1) {
+ g = g / 3.0;
+ continue;
+ }
+ if (prev < kErr) {
+ return value;
+ }
+ if (y * y < kErr) {
+ return value;
+ }
+ if (tx == value) {
+ return value;
+ }
+ if (tx == 0 || tx == 1) {
+ g = g / 3.0;
+ continue;
+ }
+ value = tx;
+ yprev = y;
+ break;
+ }
+ }
+ }
+
+ // NOTES: See also: Asymptotic inversion of the incomplete beta function.
+ // https://core.ac.uk/download/pdf/82140723.pdf
+ //
+ // NOTE: See the Boost library documentation as well:
+ // https://www.boost.org/doc/libs/1_52_0/libs/math/doc/sf_and_dist/html/math_toolkit/special/sf_beta/ibeta_function.html
+}
+
+} // namespace
+
+double BetaIncomplete(const double x, const double p, const double q) {
+ // Error cases.
+ if (p < 0 || q < 0 || x < 0 || x > 1.0) {
+ return std::numeric_limits<double>::infinity();
+ }
+ if (x == 0 || x == 1) {
+ return x;
+ }
+ // ln(Beta(p, q))
+ double beta = std::lgamma(p) + std::lgamma(q) - std::lgamma(p + q);
+ return BetaIncompleteImpl(x, p, q, beta);
+}
+
+double BetaIncompleteInv(const double p, const double q, const double alpha) {
+ // Error cases.
+ if (p < 0 || q < 0 || alpha < 0 || alpha > 1.0) {
+ return std::numeric_limits<double>::infinity();
+ }
+ if (alpha == 0 || alpha == 1) {
+ return alpha;
+ }
+ // ln(Beta(p, q))
+ double beta = std::lgamma(p) + std::lgamma(q) - std::lgamma(p + q);
+ return BetaIncompleteInvImpl(p, q, beta, alpha);
+}
+
+// Given `num_trials` trials each with probability `p` of success, the
+// probability of no failures is `p^k`. To ensure the probability of a failure
+// is no more than `p_fail`, it must be that `p^k == 1 - p_fail`. This function
+// computes `p` from that equation.
+double RequiredSuccessProbability(const double p_fail, const int num_trials) {
+ double p = std::exp(std::log(1.0 - p_fail) / static_cast<double>(num_trials));
+ ABSL_ASSERT(p > 0);
+ return p;
+}
+
+double ZScore(double expected_mean, const DistributionMoments& moments) {
+ return (moments.mean - expected_mean) /
+ (std::sqrt(moments.variance) /
+ std::sqrt(static_cast<double>(moments.n)));
+}
+
+double MaxErrorTolerance(double acceptance_probability) {
+ double one_sided_pvalue = 0.5 * (1.0 - acceptance_probability);
+ const double max_err = InverseNormalSurvival(one_sided_pvalue);
+ ABSL_ASSERT(max_err > 0);
+ return max_err;
+}
+
+} // namespace random_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/random/internal/distribution_test_util.h b/third_party/abseil/src/absl/random/internal/distribution_test_util.h
new file mode 100644
index 0000000..6d94cf6
--- /dev/null
+++ b/third_party/abseil/src/absl/random/internal/distribution_test_util.h
@@ -0,0 +1,113 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_RANDOM_INTERNAL_DISTRIBUTION_TEST_UTIL_H_
+#define ABSL_RANDOM_INTERNAL_DISTRIBUTION_TEST_UTIL_H_
+
+#include <cstddef>
+#include <iostream>
+#include <vector>
+
+#include "absl/strings/string_view.h"
+#include "absl/types/span.h"
+
+// NOTE: The functions in this file are test only, and are should not be used in
+// non-test code.
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace random_internal {
+
+// http://webspace.ship.edu/pgmarr/Geo441/Lectures/Lec%205%20-%20Normality%20Testing.pdf
+
+// Compute the 1st to 4th standard moments:
+// mean, variance, skewness, and kurtosis.
+// http://www.itl.nist.gov/div898/handbook/eda/section3/eda35b.htm
+struct DistributionMoments {
+ size_t n = 0;
+ double mean = 0.0;
+ double variance = 0.0;
+ double skewness = 0.0;
+ double kurtosis = 0.0;
+};
+DistributionMoments ComputeDistributionMoments(
+ absl::Span<const double> data_points);
+
+std::ostream& operator<<(std::ostream& os, const DistributionMoments& moments);
+
+// Computes the Z-score for a set of data with the given distribution moments
+// compared against `expected_mean`.
+double ZScore(double expected_mean, const DistributionMoments& moments);
+
+// Returns the probability of success required for a single trial to ensure that
+// after `num_trials` trials, the probability of at least one failure is no more
+// than `p_fail`.
+double RequiredSuccessProbability(double p_fail, int num_trials);
+
+// Computes the maximum distance from the mean tolerable, for Z-Tests that are
+// expected to pass with `acceptance_probability`. Will terminate if the
+// resulting tolerance is zero (due to passing in 0.0 for
+// `acceptance_probability` or rounding errors).
+//
+// For example,
+// MaxErrorTolerance(0.001) = 0.0
+// MaxErrorTolerance(0.5) = ~0.47
+// MaxErrorTolerance(1.0) = inf
+double MaxErrorTolerance(double acceptance_probability);
+
+// Approximation to inverse of the Error Function in double precision.
+// (http://people.maths.ox.ac.uk/gilesm/files/gems_erfinv.pdf)
+double erfinv(double x);
+
+// Beta(p, q) = Gamma(p) * Gamma(q) / Gamma(p+q)
+double beta(double p, double q);
+
+// The inverse of the normal survival function.
+double InverseNormalSurvival(double x);
+
+// Returns whether actual is "near" expected, based on the bound.
+bool Near(absl::string_view msg, double actual, double expected, double bound);
+
+// Implements the incomplete regularized beta function, AS63, BETAIN.
+// https://www.jstor.org/stable/2346797
+//
+// BetaIncomplete(x, p, q), where
+// `x` is the value of the upper limit
+// `p` is beta parameter p, `q` is beta parameter q.
+//
+// NOTE: This is a test-only function which is only accurate to within, at most,
+// 1e-13 of the actual value.
+//
+double BetaIncomplete(double x, double p, double q);
+
+// Implements the inverse of the incomplete regularized beta function, AS109,
+// XINBTA.
+// https://www.jstor.org/stable/2346798
+// https://www.jstor.org/stable/2346887
+//
+// BetaIncompleteInv(p, q, beta, alhpa)
+// `p` is beta parameter p, `q` is beta parameter q.
+// `alpha` is the value of the lower tail area.
+//
+// NOTE: This is a test-only function and, when successful, is only accurate to
+// within ~1e-6 of the actual value; there are some cases where it diverges from
+// the actual value by much more than that. The function uses Newton's method,
+// and thus the runtime is highly variable.
+double BetaIncompleteInv(double p, double q, double alpha);
+
+} // namespace random_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_RANDOM_INTERNAL_DISTRIBUTION_TEST_UTIL_H_
diff --git a/third_party/abseil/src/absl/random/internal/distribution_test_util_test.cc b/third_party/abseil/src/absl/random/internal/distribution_test_util_test.cc
new file mode 100644
index 0000000..c49d44f
--- /dev/null
+++ b/third_party/abseil/src/absl/random/internal/distribution_test_util_test.cc
@@ -0,0 +1,193 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/random/internal/distribution_test_util.h"
+
+#include "gtest/gtest.h"
+
+namespace {
+
+TEST(TestUtil, InverseErf) {
+ const struct {
+ const double z;
+ const double value;
+ } kErfInvTable[] = {
+ {0.0000001, 8.86227e-8},
+ {0.00001, 8.86227e-6},
+ {0.5, 0.4769362762044},
+ {0.6, 0.5951160814499},
+ {0.99999, 3.1234132743},
+ {0.9999999, 3.7665625816},
+ {0.999999944, 3.8403850690566985}, // = log((1-x) * (1+x)) =~ 16.004
+ {0.999999999, 4.3200053849134452},
+ };
+
+ for (const auto& data : kErfInvTable) {
+ auto value = absl::random_internal::erfinv(data.z);
+
+ // Log using the Wolfram-alpha function name & parameters.
+ EXPECT_NEAR(value, data.value, 1e-8)
+ << " InverseErf[" << data.z << "] (expected=" << data.value << ") -> "
+ << value;
+ }
+}
+
+const struct {
+ const double p;
+ const double q;
+ const double x;
+ const double alpha;
+} kBetaTable[] = {
+ {0.5, 0.5, 0.01, 0.06376856085851985},
+ {0.5, 0.5, 0.1, 0.2048327646991335},
+ {0.5, 0.5, 1, 1},
+ {1, 0.5, 0, 0},
+ {1, 0.5, 0.01, 0.005012562893380045},
+ {1, 0.5, 0.1, 0.0513167019494862},
+ {1, 0.5, 0.5, 0.2928932188134525},
+ {1, 1, 0.5, 0.5},
+ {2, 2, 0.1, 0.028},
+ {2, 2, 0.2, 0.104},
+ {2, 2, 0.3, 0.216},
+ {2, 2, 0.4, 0.352},
+ {2, 2, 0.5, 0.5},
+ {2, 2, 0.6, 0.648},
+ {2, 2, 0.7, 0.784},
+ {2, 2, 0.8, 0.896},
+ {2, 2, 0.9, 0.972},
+ {5.5, 5, 0.5, 0.4361908850559777},
+ {10, 0.5, 0.9, 0.1516409096346979},
+ {10, 5, 0.5, 0.08978271484375},
+ {10, 5, 1, 1},
+ {10, 10, 0.5, 0.5},
+ {20, 5, 0.8, 0.4598773297575791},
+ {20, 10, 0.6, 0.2146816102371739},
+ {20, 10, 0.8, 0.9507364826957875},
+ {20, 20, 0.5, 0.5},
+ {20, 20, 0.6, 0.8979413687105918},
+ {30, 10, 0.7, 0.2241297491808366},
+ {30, 10, 0.8, 0.7586405487192086},
+ {40, 20, 0.7, 0.7001783247477069},
+ {1, 0.5, 0.1, 0.0513167019494862},
+ {1, 0.5, 0.2, 0.1055728090000841},
+ {1, 0.5, 0.3, 0.1633399734659245},
+ {1, 0.5, 0.4, 0.2254033307585166},
+ {1, 2, 0.2, 0.36},
+ {1, 3, 0.2, 0.488},
+ {1, 4, 0.2, 0.5904},
+ {1, 5, 0.2, 0.67232},
+ {2, 2, 0.3, 0.216},
+ {3, 2, 0.3, 0.0837},
+ {4, 2, 0.3, 0.03078},
+ {5, 2, 0.3, 0.010935},
+
+ // These values test small & large points along the range of the Beta
+ // function.
+ //
+ // When selecting test points, remember that if BetaIncomplete(x, p, q)
+ // returns the same value to within the limits of precision over a large
+ // domain of the input, x, then BetaIncompleteInv(alpha, p, q) may return an
+ // essentially arbitrary value where BetaIncomplete(x, p, q) =~ alpha.
+
+ // BetaRegularized[x, 0.00001, 0.00001],
+ // For x in {~0.001 ... ~0.999}, => ~0.5
+ {1e-5, 1e-5, 1e-5, 0.4999424388184638311},
+ {1e-5, 1e-5, (1.0 - 1e-8), 0.5000920948389232964},
+
+ // BetaRegularized[x, 0.00001, 10000].
+ // For x in {~epsilon ... 1.0}, => ~1
+ {1e-5, 1e5, 1e-6, 0.9999817708130066936},
+ {1e-5, 1e5, (1.0 - 1e-7), 1.0},
+
+ // BetaRegularized[x, 10000, 0.00001].
+ // For x in {0 .. 1-epsilon}, => ~0
+ {1e5, 1e-5, 1e-6, 0},
+ {1e5, 1e-5, (1.0 - 1e-6), 1.8229186993306369e-5},
+};
+
+TEST(BetaTest, BetaIncomplete) {
+ for (const auto& data : kBetaTable) {
+ auto value = absl::random_internal::BetaIncomplete(data.x, data.p, data.q);
+
+ // Log using the Wolfram-alpha function name & parameters.
+ EXPECT_NEAR(value, data.alpha, 1e-12)
+ << " BetaRegularized[" << data.x << ", " << data.p << ", " << data.q
+ << "] (expected=" << data.alpha << ") -> " << value;
+ }
+}
+
+TEST(BetaTest, BetaIncompleteInv) {
+ for (const auto& data : kBetaTable) {
+ auto value =
+ absl::random_internal::BetaIncompleteInv(data.p, data.q, data.alpha);
+
+ // Log using the Wolfram-alpha function name & parameters.
+ EXPECT_NEAR(value, data.x, 1e-6)
+ << " InverseBetaRegularized[" << data.alpha << ", " << data.p << ", "
+ << data.q << "] (expected=" << data.x << ") -> " << value;
+ }
+}
+
+TEST(MaxErrorTolerance, MaxErrorTolerance) {
+ std::vector<std::pair<double, double>> cases = {
+ {0.0000001, 8.86227e-8 * 1.41421356237},
+ {0.00001, 8.86227e-6 * 1.41421356237},
+ {0.5, 0.4769362762044 * 1.41421356237},
+ {0.6, 0.5951160814499 * 1.41421356237},
+ {0.99999, 3.1234132743 * 1.41421356237},
+ {0.9999999, 3.7665625816 * 1.41421356237},
+ {0.999999944, 3.8403850690566985 * 1.41421356237},
+ {0.999999999, 4.3200053849134452 * 1.41421356237}};
+ for (auto entry : cases) {
+ EXPECT_NEAR(absl::random_internal::MaxErrorTolerance(entry.first),
+ entry.second, 1e-8);
+ }
+}
+
+TEST(ZScore, WithSameMean) {
+ absl::random_internal::DistributionMoments m;
+ m.n = 100;
+ m.mean = 5;
+ m.variance = 1;
+ EXPECT_NEAR(absl::random_internal::ZScore(5, m), 0, 1e-12);
+
+ m.n = 1;
+ m.mean = 0;
+ m.variance = 1;
+ EXPECT_NEAR(absl::random_internal::ZScore(0, m), 0, 1e-12);
+
+ m.n = 10000;
+ m.mean = -5;
+ m.variance = 100;
+ EXPECT_NEAR(absl::random_internal::ZScore(-5, m), 0, 1e-12);
+}
+
+TEST(ZScore, DifferentMean) {
+ absl::random_internal::DistributionMoments m;
+ m.n = 100;
+ m.mean = 5;
+ m.variance = 1;
+ EXPECT_NEAR(absl::random_internal::ZScore(4, m), 10, 1e-12);
+
+ m.n = 1;
+ m.mean = 0;
+ m.variance = 1;
+ EXPECT_NEAR(absl::random_internal::ZScore(-1, m), 1, 1e-12);
+
+ m.n = 10000;
+ m.mean = -5;
+ m.variance = 100;
+ EXPECT_NEAR(absl::random_internal::ZScore(-4, m), -10, 1e-12);
+}
+} // namespace
diff --git a/third_party/abseil/src/absl/random/internal/explicit_seed_seq.h b/third_party/abseil/src/absl/random/internal/explicit_seed_seq.h
new file mode 100644
index 0000000..6a743ea
--- /dev/null
+++ b/third_party/abseil/src/absl/random/internal/explicit_seed_seq.h
@@ -0,0 +1,91 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_RANDOM_INTERNAL_EXPLICIT_SEED_SEQ_H_
+#define ABSL_RANDOM_INTERNAL_EXPLICIT_SEED_SEQ_H_
+
+#include <algorithm>
+#include <cstddef>
+#include <cstdint>
+#include <initializer_list>
+#include <iterator>
+#include <vector>
+
+#include "absl/base/config.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace random_internal {
+
+// This class conforms to the C++ Standard "Seed Sequence" concept
+// [rand.req.seedseq].
+//
+// An "ExplicitSeedSeq" is meant to provide a conformant interface for
+// forwarding pre-computed seed material to the constructor of a class
+// conforming to the "Uniform Random Bit Generator" concept. This class makes no
+// attempt to mutate the state provided by its constructor, and returns it
+// directly via ExplicitSeedSeq::generate().
+//
+// If this class is asked to generate more seed material than was provided to
+// the constructor, then the remaining bytes will be filled with deterministic,
+// nonrandom data.
+class ExplicitSeedSeq {
+ public:
+ using result_type = uint32_t;
+
+ ExplicitSeedSeq() : state_() {}
+
+ // Copy and move both allowed.
+ ExplicitSeedSeq(const ExplicitSeedSeq& other) = default;
+ ExplicitSeedSeq& operator=(const ExplicitSeedSeq& other) = default;
+ ExplicitSeedSeq(ExplicitSeedSeq&& other) = default;
+ ExplicitSeedSeq& operator=(ExplicitSeedSeq&& other) = default;
+
+ template <typename Iterator>
+ ExplicitSeedSeq(Iterator begin, Iterator end) {
+ for (auto it = begin; it != end; it++) {
+ state_.push_back(*it & 0xffffffff);
+ }
+ }
+
+ template <typename T>
+ ExplicitSeedSeq(std::initializer_list<T> il)
+ : ExplicitSeedSeq(il.begin(), il.end()) {}
+
+ size_t size() const { return state_.size(); }
+
+ template <typename OutIterator>
+ void param(OutIterator out) const {
+ std::copy(std::begin(state_), std::end(state_), out);
+ }
+
+ template <typename OutIterator>
+ void generate(OutIterator begin, OutIterator end) {
+ for (size_t index = 0; begin != end; begin++) {
+ *begin = state_.empty() ? 0 : state_[index++];
+ if (index >= state_.size()) {
+ index = 0;
+ }
+ }
+ }
+
+ protected:
+ std::vector<uint32_t> state_;
+};
+
+} // namespace random_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_RANDOM_INTERNAL_EXPLICIT_SEED_SEQ_H_
diff --git a/third_party/abseil/src/absl/random/internal/explicit_seed_seq_test.cc b/third_party/abseil/src/absl/random/internal/explicit_seed_seq_test.cc
new file mode 100644
index 0000000..a55ad73
--- /dev/null
+++ b/third_party/abseil/src/absl/random/internal/explicit_seed_seq_test.cc
@@ -0,0 +1,204 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/random/internal/explicit_seed_seq.h"
+
+#include <iterator>
+#include <random>
+#include <utility>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/random/seed_sequences.h"
+
+namespace {
+
+template <typename Sseq>
+bool ConformsToInterface() {
+ // Check that the SeedSequence can be default-constructed.
+ { Sseq default_constructed_seq; }
+ // Check that the SeedSequence can be constructed with two iterators.
+ {
+ uint32_t init_array[] = {1, 3, 5, 7, 9};
+ Sseq iterator_constructed_seq(init_array, &init_array[5]);
+ }
+ // Check that the SeedSequence can be std::initializer_list-constructed.
+ { Sseq list_constructed_seq = {1, 3, 5, 7, 9, 11, 13}; }
+ // Check that param() and size() return state provided to constructor.
+ {
+ uint32_t init_array[] = {1, 2, 3, 4, 5};
+ Sseq seq(init_array, &init_array[ABSL_ARRAYSIZE(init_array)]);
+ EXPECT_EQ(seq.size(), ABSL_ARRAYSIZE(init_array));
+
+ uint32_t state_array[ABSL_ARRAYSIZE(init_array)];
+ seq.param(state_array);
+
+ for (int i = 0; i < ABSL_ARRAYSIZE(state_array); i++) {
+ EXPECT_EQ(state_array[i], i + 1);
+ }
+ }
+ // Check for presence of generate() method.
+ {
+ Sseq seq;
+ uint32_t seeds[5];
+
+ seq.generate(seeds, &seeds[ABSL_ARRAYSIZE(seeds)]);
+ }
+ return true;
+}
+} // namespace
+
+TEST(SeedSequences, CheckInterfaces) {
+ // Control case
+ EXPECT_TRUE(ConformsToInterface<std::seed_seq>());
+
+ // Abseil classes
+ EXPECT_TRUE(ConformsToInterface<absl::random_internal::ExplicitSeedSeq>());
+}
+
+TEST(ExplicitSeedSeq, DefaultConstructorGeneratesZeros) {
+ const size_t kNumBlocks = 128;
+
+ uint32_t outputs[kNumBlocks];
+ absl::random_internal::ExplicitSeedSeq seq;
+ seq.generate(outputs, &outputs[kNumBlocks]);
+
+ for (uint32_t& seed : outputs) {
+ EXPECT_EQ(seed, 0);
+ }
+}
+
+TEST(ExplicitSeeqSeq, SeedMaterialIsForwardedIdentically) {
+ const size_t kNumBlocks = 128;
+
+ uint32_t seed_material[kNumBlocks];
+ std::random_device urandom{"/dev/urandom"};
+ for (uint32_t& seed : seed_material) {
+ seed = urandom();
+ }
+ absl::random_internal::ExplicitSeedSeq seq(seed_material,
+ &seed_material[kNumBlocks]);
+
+ // Check that output is same as seed-material provided to constructor.
+ {
+ const size_t kNumGenerated = kNumBlocks / 2;
+ uint32_t outputs[kNumGenerated];
+ seq.generate(outputs, &outputs[kNumGenerated]);
+ for (size_t i = 0; i < kNumGenerated; i++) {
+ EXPECT_EQ(outputs[i], seed_material[i]);
+ }
+ }
+ // Check that SeedSequence is stateless between invocations: Despite the last
+ // invocation of generate() only consuming half of the input-entropy, the same
+ // entropy will be recycled for the next invocation.
+ {
+ const size_t kNumGenerated = kNumBlocks;
+ uint32_t outputs[kNumGenerated];
+ seq.generate(outputs, &outputs[kNumGenerated]);
+ for (size_t i = 0; i < kNumGenerated; i++) {
+ EXPECT_EQ(outputs[i], seed_material[i]);
+ }
+ }
+ // Check that when more seed-material is asked for than is provided, nonzero
+ // values are still written.
+ {
+ const size_t kNumGenerated = kNumBlocks * 2;
+ uint32_t outputs[kNumGenerated];
+ seq.generate(outputs, &outputs[kNumGenerated]);
+ for (size_t i = 0; i < kNumGenerated; i++) {
+ EXPECT_EQ(outputs[i], seed_material[i % kNumBlocks]);
+ }
+ }
+}
+
+TEST(ExplicitSeedSeq, CopyAndMoveConstructors) {
+ using testing::Each;
+ using testing::Eq;
+ using testing::Not;
+ using testing::Pointwise;
+
+ uint32_t entropy[4];
+ std::random_device urandom("/dev/urandom");
+ for (uint32_t& entry : entropy) {
+ entry = urandom();
+ }
+ absl::random_internal::ExplicitSeedSeq seq_from_entropy(std::begin(entropy),
+ std::end(entropy));
+ // Copy constructor.
+ {
+ absl::random_internal::ExplicitSeedSeq seq_copy(seq_from_entropy);
+ EXPECT_EQ(seq_copy.size(), seq_from_entropy.size());
+
+ std::vector<uint32_t> seeds_1;
+ seeds_1.resize(1000, 0);
+ std::vector<uint32_t> seeds_2;
+ seeds_2.resize(1000, 1);
+
+ seq_from_entropy.generate(seeds_1.begin(), seeds_1.end());
+ seq_copy.generate(seeds_2.begin(), seeds_2.end());
+
+ EXPECT_THAT(seeds_1, Pointwise(Eq(), seeds_2));
+ }
+ // Assignment operator.
+ {
+ for (uint32_t& entry : entropy) {
+ entry = urandom();
+ }
+ absl::random_internal::ExplicitSeedSeq another_seq(std::begin(entropy),
+ std::end(entropy));
+
+ std::vector<uint32_t> seeds_1;
+ seeds_1.resize(1000, 0);
+ std::vector<uint32_t> seeds_2;
+ seeds_2.resize(1000, 0);
+
+ seq_from_entropy.generate(seeds_1.begin(), seeds_1.end());
+ another_seq.generate(seeds_2.begin(), seeds_2.end());
+
+ // Assert precondition: Sequences generated by seed-sequences are not equal.
+ EXPECT_THAT(seeds_1, Not(Pointwise(Eq(), seeds_2)));
+
+ // Apply the assignment-operator.
+ another_seq = seq_from_entropy;
+
+ // Re-generate seeds.
+ seq_from_entropy.generate(seeds_1.begin(), seeds_1.end());
+ another_seq.generate(seeds_2.begin(), seeds_2.end());
+
+ // Seeds generated by seed-sequences should now be equal.
+ EXPECT_THAT(seeds_1, Pointwise(Eq(), seeds_2));
+ }
+ // Move constructor.
+ {
+ // Get seeds from seed-sequence constructed from entropy.
+ std::vector<uint32_t> seeds_1;
+ seeds_1.resize(1000, 0);
+ seq_from_entropy.generate(seeds_1.begin(), seeds_1.end());
+
+ // Apply move-constructor move the sequence to another instance.
+ absl::random_internal::ExplicitSeedSeq moved_seq(
+ std::move(seq_from_entropy));
+ std::vector<uint32_t> seeds_2;
+ seeds_2.resize(1000, 1);
+ moved_seq.generate(seeds_2.begin(), seeds_2.end());
+ // Verify that seeds produced by moved-instance are the same as original.
+ EXPECT_THAT(seeds_1, Pointwise(Eq(), seeds_2));
+
+ // Verify that the moved-from instance now behaves like a
+ // default-constructed instance.
+ EXPECT_EQ(seq_from_entropy.size(), 0);
+ seq_from_entropy.generate(seeds_1.begin(), seeds_1.end());
+ EXPECT_THAT(seeds_1, Each(Eq(0)));
+ }
+}
diff --git a/third_party/abseil/src/absl/random/internal/fast_uniform_bits.h b/third_party/abseil/src/absl/random/internal/fast_uniform_bits.h
new file mode 100644
index 0000000..425aaf7
--- /dev/null
+++ b/third_party/abseil/src/absl/random/internal/fast_uniform_bits.h
@@ -0,0 +1,268 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_RANDOM_INTERNAL_FAST_UNIFORM_BITS_H_
+#define ABSL_RANDOM_INTERNAL_FAST_UNIFORM_BITS_H_
+
+#include <cstddef>
+#include <cstdint>
+#include <limits>
+#include <type_traits>
+
+#include "absl/base/config.h"
+#include "absl/meta/type_traits.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace random_internal {
+// Returns true if the input value is zero or a power of two. Useful for
+// determining if the range of output values in a URBG
+template <typename UIntType>
+constexpr bool IsPowerOfTwoOrZero(UIntType n) {
+ return (n == 0) || ((n & (n - 1)) == 0);
+}
+
+// Computes the length of the range of values producible by the URBG, or returns
+// zero if that would encompass the entire range of representable values in
+// URBG::result_type.
+template <typename URBG>
+constexpr typename URBG::result_type RangeSize() {
+ using result_type = typename URBG::result_type;
+ static_assert((URBG::max)() != (URBG::min)(), "URBG range cannot be 0.");
+ return ((URBG::max)() == (std::numeric_limits<result_type>::max)() &&
+ (URBG::min)() == std::numeric_limits<result_type>::lowest())
+ ? result_type{0}
+ : ((URBG::max)() - (URBG::min)() + result_type{1});
+}
+
+// Computes the floor of the log. (i.e., std::floor(std::log2(N));
+template <typename UIntType>
+constexpr UIntType IntegerLog2(UIntType n) {
+ return (n <= 1) ? 0 : 1 + IntegerLog2(n >> 1);
+}
+
+// Returns the number of bits of randomness returned through
+// `PowerOfTwoVariate(urbg)`.
+template <typename URBG>
+constexpr size_t NumBits() {
+ return RangeSize<URBG>() == 0
+ ? std::numeric_limits<typename URBG::result_type>::digits
+ : IntegerLog2(RangeSize<URBG>());
+}
+
+// Given a shift value `n`, constructs a mask with exactly the low `n` bits set.
+// If `n == 0`, all bits are set.
+template <typename UIntType>
+constexpr UIntType MaskFromShift(size_t n) {
+ return ((n % std::numeric_limits<UIntType>::digits) == 0)
+ ? ~UIntType{0}
+ : (UIntType{1} << n) - UIntType{1};
+}
+
+// Tags used to dispatch FastUniformBits::generate to the simple or more complex
+// entropy extraction algorithm.
+struct SimplifiedLoopTag {};
+struct RejectionLoopTag {};
+
+// FastUniformBits implements a fast path to acquire uniform independent bits
+// from a type which conforms to the [rand.req.urbg] concept.
+// Parameterized by:
+// `UIntType`: the result (output) type
+//
+// The std::independent_bits_engine [rand.adapt.ibits] adaptor can be
+// instantiated from an existing generator through a copy or a move. It does
+// not, however, facilitate the production of pseudorandom bits from an un-owned
+// generator that will outlive the std::independent_bits_engine instance.
+template <typename UIntType = uint64_t>
+class FastUniformBits {
+ public:
+ using result_type = UIntType;
+
+ static constexpr result_type(min)() { return 0; }
+ static constexpr result_type(max)() {
+ return (std::numeric_limits<result_type>::max)();
+ }
+
+ template <typename URBG>
+ result_type operator()(URBG& g); // NOLINT(runtime/references)
+
+ private:
+ static_assert(std::is_unsigned<UIntType>::value,
+ "Class-template FastUniformBits<> must be parameterized using "
+ "an unsigned type.");
+
+ // Generate() generates a random value, dispatched on whether
+ // the underlying URBG must use rejection sampling to generate a value,
+ // or whether a simplified loop will suffice.
+ template <typename URBG>
+ result_type Generate(URBG& g, // NOLINT(runtime/references)
+ SimplifiedLoopTag);
+
+ template <typename URBG>
+ result_type Generate(URBG& g, // NOLINT(runtime/references)
+ RejectionLoopTag);
+};
+
+template <typename UIntType>
+template <typename URBG>
+typename FastUniformBits<UIntType>::result_type
+FastUniformBits<UIntType>::operator()(URBG& g) { // NOLINT(runtime/references)
+ // kRangeMask is the mask used when sampling variates from the URBG when the
+ // width of the URBG range is not a power of 2.
+ // Y = (2 ^ kRange) - 1
+ static_assert((URBG::max)() > (URBG::min)(),
+ "URBG::max and URBG::min may not be equal.");
+
+ using tag = absl::conditional_t<IsPowerOfTwoOrZero(RangeSize<URBG>()),
+ SimplifiedLoopTag, RejectionLoopTag>;
+ return Generate(g, tag{});
+}
+
+template <typename UIntType>
+template <typename URBG>
+typename FastUniformBits<UIntType>::result_type
+FastUniformBits<UIntType>::Generate(URBG& g, // NOLINT(runtime/references)
+ SimplifiedLoopTag) {
+ // The simplified version of FastUniformBits works only on URBGs that have
+ // a range that is a power of 2. In this case we simply loop and shift without
+ // attempting to balance the bits across calls.
+ static_assert(IsPowerOfTwoOrZero(RangeSize<URBG>()),
+ "incorrect Generate tag for URBG instance");
+
+ static constexpr size_t kResultBits =
+ std::numeric_limits<result_type>::digits;
+ static constexpr size_t kUrbgBits = NumBits<URBG>();
+ static constexpr size_t kIters =
+ (kResultBits / kUrbgBits) + (kResultBits % kUrbgBits != 0);
+ static constexpr size_t kShift = (kIters == 1) ? 0 : kUrbgBits;
+ static constexpr auto kMin = (URBG::min)();
+
+ result_type r = static_cast<result_type>(g() - kMin);
+ for (size_t n = 1; n < kIters; ++n) {
+ r = (r << kShift) + static_cast<result_type>(g() - kMin);
+ }
+ return r;
+}
+
+template <typename UIntType>
+template <typename URBG>
+typename FastUniformBits<UIntType>::result_type
+FastUniformBits<UIntType>::Generate(URBG& g, // NOLINT(runtime/references)
+ RejectionLoopTag) {
+ static_assert(!IsPowerOfTwoOrZero(RangeSize<URBG>()),
+ "incorrect Generate tag for URBG instance");
+ using urbg_result_type = typename URBG::result_type;
+
+ // See [rand.adapt.ibits] for more details on the constants calculated below.
+ //
+ // It is preferable to use roughly the same number of bits from each generator
+ // call, however this is only possible when the number of bits provided by the
+ // URBG is a divisor of the number of bits in `result_type`. In all other
+ // cases, the number of bits used cannot always be the same, but it can be
+ // guaranteed to be off by at most 1. Thus we run two loops, one with a
+ // smaller bit-width size (`kSmallWidth`) and one with a larger width size
+ // (satisfying `kLargeWidth == kSmallWidth + 1`). The loops are run
+ // `kSmallIters` and `kLargeIters` times respectively such
+ // that
+ //
+ // `kResultBits == kSmallIters * kSmallBits
+ // + kLargeIters * kLargeBits`
+ //
+ // where `kResultBits` is the total number of bits in `result_type`.
+ //
+ static constexpr size_t kResultBits =
+ std::numeric_limits<result_type>::digits; // w
+ static constexpr urbg_result_type kUrbgRange = RangeSize<URBG>(); // R
+ static constexpr size_t kUrbgBits = NumBits<URBG>(); // m
+
+ // compute the initial estimate of the bits used.
+ // [rand.adapt.ibits] 2 (c)
+ static constexpr size_t kA = // ceil(w/m)
+ (kResultBits / kUrbgBits) + ((kResultBits % kUrbgBits) != 0); // n'
+
+ static constexpr size_t kABits = kResultBits / kA; // w0'
+ static constexpr urbg_result_type kARejection =
+ ((kUrbgRange >> kABits) << kABits); // y0'
+
+ // refine the selection to reduce the rejection frequency.
+ static constexpr size_t kTotalIters =
+ ((kUrbgRange - kARejection) <= (kARejection / kA)) ? kA : (kA + 1); // n
+
+ // [rand.adapt.ibits] 2 (b)
+ static constexpr size_t kSmallIters =
+ kTotalIters - (kResultBits % kTotalIters); // n0
+ static constexpr size_t kSmallBits = kResultBits / kTotalIters; // w0
+ static constexpr urbg_result_type kSmallRejection =
+ ((kUrbgRange >> kSmallBits) << kSmallBits); // y0
+
+ static constexpr size_t kLargeBits = kSmallBits + 1; // w0+1
+ static constexpr urbg_result_type kLargeRejection =
+ ((kUrbgRange >> kLargeBits) << kLargeBits); // y1
+
+ //
+ // Because `kLargeBits == kSmallBits + 1`, it follows that
+ //
+ // `kResultBits == kSmallIters * kSmallBits + kLargeIters`
+ //
+ // and therefore
+ //
+ // `kLargeIters == kTotalWidth % kSmallWidth`
+ //
+ // Intuitively, each iteration with the large width accounts for one unit
+ // of the remainder when `kTotalWidth` is divided by `kSmallWidth`. As
+ // mentioned above, if the URBG width is a divisor of `kTotalWidth`, then
+ // there would be no need for any large iterations (i.e., one loop would
+ // suffice), and indeed, in this case, `kLargeIters` would be zero.
+ static_assert(kResultBits == kSmallIters * kSmallBits +
+ (kTotalIters - kSmallIters) * kLargeBits,
+ "Error in looping constant calculations.");
+
+ // The small shift is essentially small bits, but due to the potential
+ // of generating a smaller result_type from a larger urbg type, the actual
+ // shift might be 0.
+ static constexpr size_t kSmallShift = kSmallBits % kResultBits;
+ static constexpr auto kSmallMask =
+ MaskFromShift<urbg_result_type>(kSmallShift);
+ static constexpr size_t kLargeShift = kLargeBits % kResultBits;
+ static constexpr auto kLargeMask =
+ MaskFromShift<urbg_result_type>(kLargeShift);
+
+ static constexpr auto kMin = (URBG::min)();
+
+ result_type s = 0;
+ for (size_t n = 0; n < kSmallIters; ++n) {
+ urbg_result_type v;
+ do {
+ v = g() - kMin;
+ } while (v >= kSmallRejection);
+
+ s = (s << kSmallShift) + static_cast<result_type>(v & kSmallMask);
+ }
+
+ for (size_t n = kSmallIters; n < kTotalIters; ++n) {
+ urbg_result_type v;
+ do {
+ v = g() - kMin;
+ } while (v >= kLargeRejection);
+
+ s = (s << kLargeShift) + static_cast<result_type>(v & kLargeMask);
+ }
+ return s;
+}
+
+} // namespace random_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_RANDOM_INTERNAL_FAST_UNIFORM_BITS_H_
diff --git a/third_party/abseil/src/absl/random/internal/fast_uniform_bits_test.cc b/third_party/abseil/src/absl/random/internal/fast_uniform_bits_test.cc
new file mode 100644
index 0000000..cee702d
--- /dev/null
+++ b/third_party/abseil/src/absl/random/internal/fast_uniform_bits_test.cc
@@ -0,0 +1,336 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/random/internal/fast_uniform_bits.h"
+
+#include <random>
+
+#include "gtest/gtest.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace random_internal {
+namespace {
+
+template <typename IntType>
+class FastUniformBitsTypedTest : public ::testing::Test {};
+
+using IntTypes = ::testing::Types<uint8_t, uint16_t, uint32_t, uint64_t>;
+
+TYPED_TEST_SUITE(FastUniformBitsTypedTest, IntTypes);
+
+TYPED_TEST(FastUniformBitsTypedTest, BasicTest) {
+ using Limits = std::numeric_limits<TypeParam>;
+ using FastBits = FastUniformBits<TypeParam>;
+
+ EXPECT_EQ(0, (FastBits::min)());
+ EXPECT_EQ((Limits::max)(), (FastBits::max)());
+
+ constexpr int kIters = 10000;
+ std::random_device rd;
+ std::mt19937 gen(rd());
+ FastBits fast;
+ for (int i = 0; i < kIters; i++) {
+ const auto v = fast(gen);
+ EXPECT_LE(v, (FastBits::max)());
+ EXPECT_GE(v, (FastBits::min)());
+ }
+}
+
+template <typename UIntType, UIntType Lo, UIntType Hi, UIntType Val = Lo>
+struct FakeUrbg {
+ using result_type = UIntType;
+
+ FakeUrbg() = default;
+ explicit FakeUrbg(bool r) : reject(r) {}
+
+ static constexpr result_type(max)() { return Hi; }
+ static constexpr result_type(min)() { return Lo; }
+ result_type operator()() {
+ // when reject is set, return Hi half the time.
+ return ((++calls % 2) == 1 && reject) ? Hi : Val;
+ }
+
+ bool reject = false;
+ size_t calls = 0;
+};
+
+TEST(FastUniformBitsTest, IsPowerOfTwoOrZero) {
+ EXPECT_TRUE(IsPowerOfTwoOrZero(uint8_t{0}));
+ EXPECT_TRUE(IsPowerOfTwoOrZero(uint8_t{1}));
+ EXPECT_TRUE(IsPowerOfTwoOrZero(uint8_t{2}));
+ EXPECT_FALSE(IsPowerOfTwoOrZero(uint8_t{3}));
+ EXPECT_TRUE(IsPowerOfTwoOrZero(uint8_t{4}));
+ EXPECT_TRUE(IsPowerOfTwoOrZero(uint8_t{16}));
+ EXPECT_FALSE(IsPowerOfTwoOrZero(uint8_t{17}));
+ EXPECT_FALSE(IsPowerOfTwoOrZero((std::numeric_limits<uint8_t>::max)()));
+
+ EXPECT_TRUE(IsPowerOfTwoOrZero(uint16_t{0}));
+ EXPECT_TRUE(IsPowerOfTwoOrZero(uint16_t{1}));
+ EXPECT_TRUE(IsPowerOfTwoOrZero(uint16_t{2}));
+ EXPECT_FALSE(IsPowerOfTwoOrZero(uint16_t{3}));
+ EXPECT_TRUE(IsPowerOfTwoOrZero(uint16_t{4}));
+ EXPECT_TRUE(IsPowerOfTwoOrZero(uint16_t{16}));
+ EXPECT_FALSE(IsPowerOfTwoOrZero(uint16_t{17}));
+ EXPECT_FALSE(IsPowerOfTwoOrZero((std::numeric_limits<uint16_t>::max)()));
+
+ EXPECT_TRUE(IsPowerOfTwoOrZero(uint32_t{0}));
+ EXPECT_TRUE(IsPowerOfTwoOrZero(uint32_t{1}));
+ EXPECT_TRUE(IsPowerOfTwoOrZero(uint32_t{2}));
+ EXPECT_FALSE(IsPowerOfTwoOrZero(uint32_t{3}));
+ EXPECT_TRUE(IsPowerOfTwoOrZero(uint32_t{32}));
+ EXPECT_FALSE(IsPowerOfTwoOrZero(uint32_t{17}));
+ EXPECT_FALSE(IsPowerOfTwoOrZero((std::numeric_limits<uint32_t>::max)()));
+
+ EXPECT_TRUE(IsPowerOfTwoOrZero(uint64_t{0}));
+ EXPECT_TRUE(IsPowerOfTwoOrZero(uint64_t{1}));
+ EXPECT_TRUE(IsPowerOfTwoOrZero(uint64_t{2}));
+ EXPECT_FALSE(IsPowerOfTwoOrZero(uint64_t{3}));
+ EXPECT_TRUE(IsPowerOfTwoOrZero(uint64_t{4}));
+ EXPECT_TRUE(IsPowerOfTwoOrZero(uint64_t{64}));
+ EXPECT_FALSE(IsPowerOfTwoOrZero(uint64_t{17}));
+ EXPECT_FALSE(IsPowerOfTwoOrZero((std::numeric_limits<uint64_t>::max)()));
+}
+
+TEST(FastUniformBitsTest, IntegerLog2) {
+ EXPECT_EQ(0, IntegerLog2(uint16_t{0}));
+ EXPECT_EQ(0, IntegerLog2(uint16_t{1}));
+ EXPECT_EQ(1, IntegerLog2(uint16_t{2}));
+ EXPECT_EQ(1, IntegerLog2(uint16_t{3}));
+ EXPECT_EQ(2, IntegerLog2(uint16_t{4}));
+ EXPECT_EQ(2, IntegerLog2(uint16_t{5}));
+ EXPECT_EQ(2, IntegerLog2(uint16_t{7}));
+ EXPECT_EQ(3, IntegerLog2(uint16_t{8}));
+ EXPECT_EQ(63, IntegerLog2((std::numeric_limits<uint64_t>::max)()));
+}
+
+TEST(FastUniformBitsTest, RangeSize) {
+ EXPECT_EQ(2, (RangeSize<FakeUrbg<uint8_t, 0, 1>>()));
+ EXPECT_EQ(3, (RangeSize<FakeUrbg<uint8_t, 0, 2>>()));
+ EXPECT_EQ(4, (RangeSize<FakeUrbg<uint8_t, 0, 3>>()));
+ // EXPECT_EQ(0, (RangeSize<FakeUrbg<uint8_t, 2, 2>>()));
+ EXPECT_EQ(4, (RangeSize<FakeUrbg<uint8_t, 2, 5>>()));
+ EXPECT_EQ(5, (RangeSize<FakeUrbg<uint8_t, 2, 6>>()));
+ EXPECT_EQ(9, (RangeSize<FakeUrbg<uint8_t, 2, 10>>()));
+ EXPECT_EQ(
+ 0, (RangeSize<
+ FakeUrbg<uint8_t, 0, (std::numeric_limits<uint8_t>::max)()>>()));
+
+ EXPECT_EQ(4, (RangeSize<FakeUrbg<uint16_t, 0, 3>>()));
+ EXPECT_EQ(4, (RangeSize<FakeUrbg<uint16_t, 2, 5>>()));
+ EXPECT_EQ(5, (RangeSize<FakeUrbg<uint16_t, 2, 6>>()));
+ EXPECT_EQ(18, (RangeSize<FakeUrbg<uint16_t, 1000, 1017>>()));
+ EXPECT_EQ(
+ 0, (RangeSize<
+ FakeUrbg<uint16_t, 0, (std::numeric_limits<uint16_t>::max)()>>()));
+
+ EXPECT_EQ(4, (RangeSize<FakeUrbg<uint32_t, 0, 3>>()));
+ EXPECT_EQ(4, (RangeSize<FakeUrbg<uint32_t, 2, 5>>()));
+ EXPECT_EQ(5, (RangeSize<FakeUrbg<uint32_t, 2, 6>>()));
+ EXPECT_EQ(18, (RangeSize<FakeUrbg<uint32_t, 1000, 1017>>()));
+ EXPECT_EQ(0, (RangeSize<FakeUrbg<uint32_t, 0, 0xffffffff>>()));
+ EXPECT_EQ(0xffffffff, (RangeSize<FakeUrbg<uint32_t, 1, 0xffffffff>>()));
+ EXPECT_EQ(0xfffffffe, (RangeSize<FakeUrbg<uint32_t, 1, 0xfffffffe>>()));
+ EXPECT_EQ(0xfffffffd, (RangeSize<FakeUrbg<uint32_t, 2, 0xfffffffe>>()));
+ EXPECT_EQ(
+ 0, (RangeSize<
+ FakeUrbg<uint32_t, 0, (std::numeric_limits<uint32_t>::max)()>>()));
+
+ EXPECT_EQ(4, (RangeSize<FakeUrbg<uint64_t, 0, 3>>()));
+ EXPECT_EQ(4, (RangeSize<FakeUrbg<uint64_t, 2, 5>>()));
+ EXPECT_EQ(5, (RangeSize<FakeUrbg<uint64_t, 2, 6>>()));
+ EXPECT_EQ(18, (RangeSize<FakeUrbg<uint64_t, 1000, 1017>>()));
+ EXPECT_EQ(0x100000000, (RangeSize<FakeUrbg<uint64_t, 0, 0xffffffff>>()));
+ EXPECT_EQ(0xffffffff, (RangeSize<FakeUrbg<uint64_t, 1, 0xffffffff>>()));
+ EXPECT_EQ(0xfffffffe, (RangeSize<FakeUrbg<uint64_t, 1, 0xfffffffe>>()));
+ EXPECT_EQ(0xfffffffd, (RangeSize<FakeUrbg<uint64_t, 2, 0xfffffffe>>()));
+ EXPECT_EQ(0, (RangeSize<FakeUrbg<uint64_t, 0, 0xffffffffffffffff>>()));
+ EXPECT_EQ(0xffffffffffffffff,
+ (RangeSize<FakeUrbg<uint64_t, 1, 0xffffffffffffffff>>()));
+ EXPECT_EQ(0xfffffffffffffffe,
+ (RangeSize<FakeUrbg<uint64_t, 1, 0xfffffffffffffffe>>()));
+ EXPECT_EQ(0xfffffffffffffffd,
+ (RangeSize<FakeUrbg<uint64_t, 2, 0xfffffffffffffffe>>()));
+ EXPECT_EQ(
+ 0, (RangeSize<
+ FakeUrbg<uint64_t, 0, (std::numeric_limits<uint64_t>::max)()>>()));
+}
+
+// The constants need to be choosen so that an infinite rejection loop doesn't
+// happen...
+using Urng1_5bit = FakeUrbg<uint8_t, 0, 2, 0>; // ~1.5 bits (range 3)
+using Urng4bits = FakeUrbg<uint8_t, 1, 0x10, 2>;
+using Urng22bits = FakeUrbg<uint32_t, 0, 0x3fffff, 0x301020>;
+using Urng31bits = FakeUrbg<uint32_t, 1, 0xfffffffe, 0x60070f03>; // ~31.9 bits
+using Urng32bits = FakeUrbg<uint32_t, 0, 0xffffffff, 0x74010f01>;
+using Urng33bits =
+ FakeUrbg<uint64_t, 1, 0x1ffffffff, 0x013301033>; // ~32.9 bits
+using Urng63bits = FakeUrbg<uint64_t, 1, 0xfffffffffffffffe,
+ 0xfedcba9012345678>; // ~63.9 bits
+using Urng64bits =
+ FakeUrbg<uint64_t, 0, 0xffffffffffffffff, 0x123456780fedcba9>;
+
+TEST(FastUniformBitsTest, OutputsUpTo32Bits) {
+ // Tests that how values are composed; the single-bit deltas should be spread
+ // across each invocation.
+ Urng1_5bit urng1_5;
+ Urng4bits urng4;
+ Urng22bits urng22;
+ Urng31bits urng31;
+ Urng32bits urng32;
+ Urng33bits urng33;
+ Urng63bits urng63;
+ Urng64bits urng64;
+
+ // 8-bit types
+ {
+ FastUniformBits<uint8_t> fast8;
+ EXPECT_EQ(0x0, fast8(urng1_5));
+ EXPECT_EQ(0x11, fast8(urng4));
+ EXPECT_EQ(0x20, fast8(urng22));
+ EXPECT_EQ(0x2, fast8(urng31));
+ EXPECT_EQ(0x1, fast8(urng32));
+ EXPECT_EQ(0x32, fast8(urng33));
+ EXPECT_EQ(0x77, fast8(urng63));
+ EXPECT_EQ(0xa9, fast8(urng64));
+ }
+
+ // 16-bit types
+ {
+ FastUniformBits<uint16_t> fast16;
+ EXPECT_EQ(0x0, fast16(urng1_5));
+ EXPECT_EQ(0x1111, fast16(urng4));
+ EXPECT_EQ(0x1020, fast16(urng22));
+ EXPECT_EQ(0x0f02, fast16(urng31));
+ EXPECT_EQ(0x0f01, fast16(urng32));
+ EXPECT_EQ(0x1032, fast16(urng33));
+ EXPECT_EQ(0x5677, fast16(urng63));
+ EXPECT_EQ(0xcba9, fast16(urng64));
+ }
+
+ // 32-bit types
+ {
+ FastUniformBits<uint32_t> fast32;
+ EXPECT_EQ(0x0, fast32(urng1_5));
+ EXPECT_EQ(0x11111111, fast32(urng4));
+ EXPECT_EQ(0x08301020, fast32(urng22));
+ EXPECT_EQ(0x0f020f02, fast32(urng31));
+ EXPECT_EQ(0x74010f01, fast32(urng32));
+ EXPECT_EQ(0x13301032, fast32(urng33));
+ EXPECT_EQ(0x12345677, fast32(urng63));
+ EXPECT_EQ(0x0fedcba9, fast32(urng64));
+ }
+}
+
+TEST(FastUniformBitsTest, Outputs64Bits) {
+ // Tests that how values are composed; the single-bit deltas should be spread
+ // across each invocation.
+ FastUniformBits<uint64_t> fast64;
+
+ {
+ FakeUrbg<uint8_t, 0, 1, 0> urng0;
+ FakeUrbg<uint8_t, 0, 1, 1> urng1;
+ Urng4bits urng4;
+ Urng22bits urng22;
+ Urng31bits urng31;
+ Urng32bits urng32;
+ Urng33bits urng33;
+ Urng63bits urng63;
+ Urng64bits urng64;
+
+ // somewhat degenerate cases only create a single bit.
+ EXPECT_EQ(0x0, fast64(urng0));
+ EXPECT_EQ(64, urng0.calls);
+ EXPECT_EQ(0xffffffffffffffff, fast64(urng1));
+ EXPECT_EQ(64, urng1.calls);
+
+ // less degenerate cases.
+ EXPECT_EQ(0x1111111111111111, fast64(urng4));
+ EXPECT_EQ(16, urng4.calls);
+ EXPECT_EQ(0x01020c0408301020, fast64(urng22));
+ EXPECT_EQ(3, urng22.calls);
+ EXPECT_EQ(0x387811c3c0870f02, fast64(urng31));
+ EXPECT_EQ(3, urng31.calls);
+ EXPECT_EQ(0x74010f0174010f01, fast64(urng32));
+ EXPECT_EQ(2, urng32.calls);
+ EXPECT_EQ(0x808194040cb01032, fast64(urng33));
+ EXPECT_EQ(3, urng33.calls);
+ EXPECT_EQ(0x1234567712345677, fast64(urng63));
+ EXPECT_EQ(2, urng63.calls);
+ EXPECT_EQ(0x123456780fedcba9, fast64(urng64));
+ EXPECT_EQ(1, urng64.calls);
+ }
+
+ // The 1.5 bit case is somewhat interesting in that the algorithm refinement
+ // causes one extra small sample. Comments here reference the names used in
+ // [rand.adapt.ibits] that correspond to this case.
+ {
+ Urng1_5bit urng1_5;
+
+ // w = 64
+ // R = 3
+ // m = 1
+ // n' = 64
+ // w0' = 1
+ // y0' = 2
+ // n = (1 <= 0) > 64 : 65 = 65
+ // n0 = 65 - (64%65) = 1
+ // n1 = 64
+ // w0 = 0
+ // y0 = 3
+ // w1 = 1
+ // y1 = 2
+ EXPECT_EQ(0x0, fast64(urng1_5));
+ EXPECT_EQ(65, urng1_5.calls);
+ }
+
+ // Validate rejections for non-power-of-2 cases.
+ {
+ Urng1_5bit urng1_5(true);
+ Urng31bits urng31(true);
+ Urng33bits urng33(true);
+ Urng63bits urng63(true);
+
+ // For 1.5 bits, there would be 1+2*64, except the first
+ // value was accepted and shifted off the end.
+ EXPECT_EQ(0, fast64(urng1_5));
+ EXPECT_EQ(128, urng1_5.calls);
+ EXPECT_EQ(0x387811c3c0870f02, fast64(urng31));
+ EXPECT_EQ(6, urng31.calls);
+ EXPECT_EQ(0x808194040cb01032, fast64(urng33));
+ EXPECT_EQ(6, urng33.calls);
+ EXPECT_EQ(0x1234567712345677, fast64(urng63));
+ EXPECT_EQ(4, urng63.calls);
+ }
+}
+
+TEST(FastUniformBitsTest, URBG32bitRegression) {
+ // Validate with deterministic 32-bit std::minstd_rand
+ // to ensure that operator() performs as expected.
+
+ EXPECT_EQ(2147483646, RangeSize<std::minstd_rand>());
+ EXPECT_EQ(30, IntegerLog2(RangeSize<std::minstd_rand>()));
+
+ std::minstd_rand gen(1);
+ FastUniformBits<uint64_t> fast64;
+
+ EXPECT_EQ(0x05e47095f8791f45, fast64(gen));
+ EXPECT_EQ(0x028be17e3c07c122, fast64(gen));
+ EXPECT_EQ(0x55d2847c1626e8c2, fast64(gen));
+}
+
+} // namespace
+} // namespace random_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/random/internal/fastmath.h b/third_party/abseil/src/absl/random/internal/fastmath.h
new file mode 100644
index 0000000..6baeb5a
--- /dev/null
+++ b/third_party/abseil/src/absl/random/internal/fastmath.h
@@ -0,0 +1,74 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_RANDOM_INTERNAL_FASTMATH_H_
+#define ABSL_RANDOM_INTERNAL_FASTMATH_H_
+
+// This file contains fast math functions (bitwise ops as well as some others)
+// which are implementation details of various absl random number distributions.
+
+#include <cassert>
+#include <cmath>
+#include <cstdint>
+
+#include "absl/base/internal/bits.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace random_internal {
+
+// Returns the position of the first bit set.
+inline int LeadingSetBit(uint64_t n) {
+ return 64 - base_internal::CountLeadingZeros64(n);
+}
+
+// Compute log2(n) using integer operations.
+// While std::log2 is more accurate than std::log(n) / std::log(2), for
+// very large numbers--those close to std::numeric_limits<uint64_t>::max() - 2,
+// for instance--std::log2 rounds up rather than down, which introduces
+// definite skew in the results.
+inline int IntLog2Floor(uint64_t n) {
+ return (n <= 1) ? 0 : (63 - base_internal::CountLeadingZeros64(n));
+}
+inline int IntLog2Ceil(uint64_t n) {
+ return (n <= 1) ? 0 : (64 - base_internal::CountLeadingZeros64(n - 1));
+}
+
+inline double StirlingLogFactorial(double n) {
+ assert(n >= 1);
+ // Using Stirling's approximation.
+ constexpr double kLog2PI = 1.83787706640934548356;
+ const double logn = std::log(n);
+ const double ninv = 1.0 / static_cast<double>(n);
+ return n * logn - n + 0.5 * (kLog2PI + logn) + (1.0 / 12.0) * ninv -
+ (1.0 / 360.0) * ninv * ninv * ninv;
+}
+
+// Rotate value right.
+//
+// We only implement the uint32_t / uint64_t versions because
+// 1) those are the only ones we use, and
+// 2) those are the only ones where clang detects the rotate idiom correctly.
+inline constexpr uint32_t rotr(uint32_t value, uint8_t bits) {
+ return (value >> (bits & 31)) | (value << ((-bits) & 31));
+}
+inline constexpr uint64_t rotr(uint64_t value, uint8_t bits) {
+ return (value >> (bits & 63)) | (value << ((-bits) & 63));
+}
+
+} // namespace random_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_RANDOM_INTERNAL_FASTMATH_H_
diff --git a/third_party/abseil/src/absl/random/internal/fastmath_test.cc b/third_party/abseil/src/absl/random/internal/fastmath_test.cc
new file mode 100644
index 0000000..65859c2
--- /dev/null
+++ b/third_party/abseil/src/absl/random/internal/fastmath_test.cc
@@ -0,0 +1,110 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/random/internal/fastmath.h"
+
+#include "gtest/gtest.h"
+
+#if defined(__native_client__) || defined(__EMSCRIPTEN__)
+// NACL has a less accurate implementation of std::log2 than most of
+// the other platforms. For some values which should have integral results,
+// sometimes NACL returns slightly larger values.
+//
+// The MUSL libc used by emscripten also has a similar bug.
+#define ABSL_RANDOM_INACCURATE_LOG2
+#endif
+
+namespace {
+
+TEST(DistributionImplTest, LeadingSetBit) {
+ using absl::random_internal::LeadingSetBit;
+ constexpr uint64_t kZero = 0;
+ EXPECT_EQ(0, LeadingSetBit(kZero));
+ EXPECT_EQ(64, LeadingSetBit(~kZero));
+
+ for (int index = 0; index < 64; index++) {
+ uint64_t x = static_cast<uint64_t>(1) << index;
+ EXPECT_EQ(index + 1, LeadingSetBit(x)) << index;
+ EXPECT_EQ(index + 1, LeadingSetBit(x + x - 1)) << index;
+ }
+}
+
+TEST(FastMathTest, IntLog2FloorTest) {
+ using absl::random_internal::IntLog2Floor;
+ constexpr uint64_t kZero = 0;
+ EXPECT_EQ(0, IntLog2Floor(0)); // boundary. return 0.
+ EXPECT_EQ(0, IntLog2Floor(1));
+ EXPECT_EQ(1, IntLog2Floor(2));
+ EXPECT_EQ(63, IntLog2Floor(~kZero));
+
+ // A boundary case: Converting 0xffffffffffffffff requires > 53
+ // bits of precision, so the conversion to double rounds up,
+ // and the result of std::log2(x) > IntLog2Floor(x).
+ EXPECT_LT(IntLog2Floor(~kZero), static_cast<int>(std::log2(~kZero)));
+
+ for (int i = 0; i < 64; i++) {
+ const uint64_t i_pow_2 = static_cast<uint64_t>(1) << i;
+ EXPECT_EQ(i, IntLog2Floor(i_pow_2));
+ EXPECT_EQ(i, static_cast<int>(std::log2(i_pow_2)));
+
+ uint64_t y = i_pow_2;
+ for (int j = i - 1; j > 0; --j) {
+ y = y | (i_pow_2 >> j);
+ EXPECT_EQ(i, IntLog2Floor(y));
+ }
+ }
+}
+
+TEST(FastMathTest, IntLog2CeilTest) {
+ using absl::random_internal::IntLog2Ceil;
+ constexpr uint64_t kZero = 0;
+ EXPECT_EQ(0, IntLog2Ceil(0)); // boundary. return 0.
+ EXPECT_EQ(0, IntLog2Ceil(1));
+ EXPECT_EQ(1, IntLog2Ceil(2));
+ EXPECT_EQ(64, IntLog2Ceil(~kZero));
+
+ // A boundary case: Converting 0xffffffffffffffff requires > 53
+ // bits of precision, so the conversion to double rounds up,
+ // and the result of std::log2(x) > IntLog2Floor(x).
+ EXPECT_LE(IntLog2Ceil(~kZero), static_cast<int>(std::log2(~kZero)));
+
+ for (int i = 0; i < 64; i++) {
+ const uint64_t i_pow_2 = static_cast<uint64_t>(1) << i;
+ EXPECT_EQ(i, IntLog2Ceil(i_pow_2));
+#ifndef ABSL_RANDOM_INACCURATE_LOG2
+ EXPECT_EQ(i, static_cast<int>(std::ceil(std::log2(i_pow_2))));
+#endif
+
+ uint64_t y = i_pow_2;
+ for (int j = i - 1; j > 0; --j) {
+ y = y | (i_pow_2 >> j);
+ EXPECT_EQ(i + 1, IntLog2Ceil(y));
+ }
+ }
+}
+
+TEST(FastMathTest, StirlingLogFactorial) {
+ using absl::random_internal::StirlingLogFactorial;
+
+ EXPECT_NEAR(StirlingLogFactorial(1.0), 0, 1e-3);
+ EXPECT_NEAR(StirlingLogFactorial(1.50), 0.284683, 1e-3);
+ EXPECT_NEAR(StirlingLogFactorial(2.0), 0.69314718056, 1e-4);
+
+ for (int i = 2; i < 50; i++) {
+ double d = static_cast<double>(i);
+ EXPECT_NEAR(StirlingLogFactorial(d), std::lgamma(d + 1), 3e-5);
+ }
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/random/internal/gaussian_distribution_gentables.cc b/third_party/abseil/src/absl/random/internal/gaussian_distribution_gentables.cc
new file mode 100644
index 0000000..a95333d
--- /dev/null
+++ b/third_party/abseil/src/absl/random/internal/gaussian_distribution_gentables.cc
@@ -0,0 +1,143 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Generates gaussian_distribution.cc
+//
+// $ blaze run :gaussian_distribution_gentables > gaussian_distribution.cc
+//
+#include "absl/random/gaussian_distribution.h"
+
+#include <cmath>
+#include <cstddef>
+#include <iostream>
+#include <limits>
+#include <string>
+
+#include "absl/base/macros.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace random_internal {
+namespace {
+
+template <typename T, size_t N>
+void FormatArrayContents(std::ostream* os, T (&data)[N]) {
+ if (!std::numeric_limits<T>::is_exact) {
+ // Note: T is either an integer or a float.
+ // float requires higher precision to ensure that values are
+ // reproduced exactly.
+ // Trivia: C99 has hexadecimal floating point literals, but C++11 does not.
+ // Using them would remove all concern of precision loss.
+ os->precision(std::numeric_limits<T>::max_digits10 + 2);
+ }
+ *os << " {";
+ std::string separator = "";
+ for (size_t i = 0; i < N; ++i) {
+ *os << separator << data[i];
+ if ((i + 1) % 3 != 0) {
+ separator = ", ";
+ } else {
+ separator = ",\n ";
+ }
+ }
+ *os << "}";
+}
+
+} // namespace
+
+class TableGenerator : public gaussian_distribution_base {
+ public:
+ TableGenerator();
+ void Print(std::ostream* os);
+
+ using gaussian_distribution_base::kMask;
+ using gaussian_distribution_base::kR;
+ using gaussian_distribution_base::kV;
+
+ private:
+ Tables tables_;
+};
+
+// Ziggurat gaussian initialization. For an explanation of the algorithm, see
+// the Marsaglia paper, "The Ziggurat Method for Generating Random Variables".
+// http://www.jstatsoft.org/v05/i08/
+//
+// Further details are available in the Doornik paper
+// https://www.doornik.com/research/ziggurat.pdf
+//
+TableGenerator::TableGenerator() {
+ // The constants here should match the values in gaussian_distribution.h
+ static constexpr int kC = kMask + 1;
+
+ static_assert((ABSL_ARRAYSIZE(tables_.x) == kC + 1),
+ "xArray must be length kMask + 2");
+
+ static_assert((ABSL_ARRAYSIZE(tables_.x) == ABSL_ARRAYSIZE(tables_.f)),
+ "fx and x arrays must be identical length");
+
+ auto f = [](double x) { return std::exp(-0.5 * x * x); };
+ auto f_inv = [](double x) { return std::sqrt(-2.0 * std::log(x)); };
+
+ tables_.x[0] = kV / f(kR);
+ tables_.f[0] = f(tables_.x[0]);
+
+ tables_.x[1] = kR;
+ tables_.f[1] = f(tables_.x[1]);
+
+ tables_.x[kC] = 0.0;
+ tables_.f[kC] = f(tables_.x[kC]); // 1.0
+
+ for (int i = 2; i < kC; i++) {
+ double v = (kV / tables_.x[i - 1]) + tables_.f[i - 1];
+ tables_.x[i] = f_inv(v);
+ tables_.f[i] = v;
+ }
+}
+
+void TableGenerator::Print(std::ostream* os) {
+ *os << "// BEGIN GENERATED CODE; DO NOT EDIT\n"
+ "// clang-format off\n"
+ "\n"
+ "#include \"absl/random/gaussian_distribution.h\"\n"
+ "\n"
+ "namespace absl {\n"
+ "ABSL_NAMESPACE_BEGIN\n"
+ "namespace random_internal {\n"
+ "\n"
+ "const gaussian_distribution_base::Tables\n"
+ " gaussian_distribution_base::zg_ = {\n";
+ FormatArrayContents(os, tables_.x);
+ *os << ",\n";
+ FormatArrayContents(os, tables_.f);
+ *os << "};\n"
+ "\n"
+ "} // namespace random_internal\n"
+ "ABSL_NAMESPACE_END\n"
+ "} // namespace absl\n"
+ "\n"
+ "// clang-format on\n"
+ "// END GENERATED CODE";
+ *os << std::endl;
+}
+
+} // namespace random_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+int main(int, char**) {
+ std::cerr << "\nCopy the output to gaussian_distribution.cc" << std::endl;
+ absl::random_internal::TableGenerator generator;
+ generator.Print(&std::cout);
+ return 0;
+}
diff --git a/third_party/abseil/src/absl/random/internal/generate_real.h b/third_party/abseil/src/absl/random/internal/generate_real.h
new file mode 100644
index 0000000..20f6d20
--- /dev/null
+++ b/third_party/abseil/src/absl/random/internal/generate_real.h
@@ -0,0 +1,146 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_RANDOM_INTERNAL_GENERATE_REAL_H_
+#define ABSL_RANDOM_INTERNAL_GENERATE_REAL_H_
+
+// This file contains some implementation details which are used by one or more
+// of the absl random number distributions.
+
+#include <cstdint>
+#include <cstring>
+#include <limits>
+#include <type_traits>
+
+#include "absl/base/internal/bits.h"
+#include "absl/meta/type_traits.h"
+#include "absl/random/internal/fastmath.h"
+#include "absl/random/internal/traits.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace random_internal {
+
+// Tristate tag types controlling the output of GenerateRealFromBits.
+struct GeneratePositiveTag {};
+struct GenerateNegativeTag {};
+struct GenerateSignedTag {};
+
+// GenerateRealFromBits generates a single real value from a single 64-bit
+// `bits` with template fields controlling the output.
+//
+// The `SignedTag` parameter controls whether positive, negative,
+// or either signed/unsigned may be returned.
+// When SignedTag == GeneratePositiveTag, range is U(0, 1)
+// When SignedTag == GenerateNegativeTag, range is U(-1, 0)
+// When SignedTag == GenerateSignedTag, range is U(-1, 1)
+//
+// When the `IncludeZero` parameter is true, the function may return 0 for some
+// inputs, otherwise it never returns 0.
+//
+// When a value in U(0,1) is required, use:
+// Uniform64ToReal<double, PositiveValueT, true>;
+//
+// When a value in U(-1,1) is required, use:
+// Uniform64ToReal<double, SignedValueT, false>;
+//
+// This generates more distinct values than the mathematical equivalent
+// `U(0, 1) * 2.0 - 1.0`.
+//
+// Scaling the result by powers of 2 (and avoiding a multiply) is also possible:
+// GenerateRealFromBits<double>(..., -1); => U(0, 0.5)
+// GenerateRealFromBits<double>(..., 1); => U(0, 2)
+//
+template <typename RealType, // Real type, either float or double.
+ typename SignedTag = GeneratePositiveTag, // Whether a positive,
+ // negative, or signed
+ // value is generated.
+ bool IncludeZero = true>
+inline RealType GenerateRealFromBits(uint64_t bits, int exp_bias = 0) {
+ using real_type = RealType;
+ using uint_type = absl::conditional_t<std::is_same<real_type, float>::value,
+ uint32_t, uint64_t>;
+
+ static_assert(
+ (std::is_same<double, real_type>::value ||
+ std::is_same<float, real_type>::value),
+ "GenerateRealFromBits must be parameterized by either float or double.");
+
+ static_assert(sizeof(uint_type) == sizeof(real_type),
+ "Mismatched unsinged and real types.");
+
+ static_assert((std::numeric_limits<real_type>::is_iec559 &&
+ std::numeric_limits<real_type>::radix == 2),
+ "RealType representation is not IEEE 754 binary.");
+
+ static_assert((std::is_same<SignedTag, GeneratePositiveTag>::value ||
+ std::is_same<SignedTag, GenerateNegativeTag>::value ||
+ std::is_same<SignedTag, GenerateSignedTag>::value),
+ "");
+
+ static constexpr int kExp = std::numeric_limits<real_type>::digits - 1;
+ static constexpr uint_type kMask = (static_cast<uint_type>(1) << kExp) - 1u;
+ static constexpr int kUintBits = sizeof(uint_type) * 8;
+
+ int exp = exp_bias + int{std::numeric_limits<real_type>::max_exponent - 2};
+
+ // Determine the sign bit.
+ // Depending on the SignedTag, this may use the left-most bit
+ // or it may be a constant value.
+ uint_type sign = std::is_same<SignedTag, GenerateNegativeTag>::value
+ ? (static_cast<uint_type>(1) << (kUintBits - 1))
+ : 0;
+ if (std::is_same<SignedTag, GenerateSignedTag>::value) {
+ if (std::is_same<uint_type, uint64_t>::value) {
+ sign = bits & uint64_t{0x8000000000000000};
+ }
+ if (std::is_same<uint_type, uint32_t>::value) {
+ const uint64_t tmp = bits & uint64_t{0x8000000000000000};
+ sign = static_cast<uint32_t>(tmp >> 32);
+ }
+ // adjust the bits and the exponent to account for removing
+ // the leading bit.
+ bits = bits & uint64_t{0x7FFFFFFFFFFFFFFF};
+ exp++;
+ }
+ if (IncludeZero) {
+ if (bits == 0u) return 0;
+ }
+
+ // Number of leading zeros is mapped to the exponent: 2^-clz
+ // bits is 0..01xxxxxx. After shifting, we're left with 1xxx...0..0
+ int clz = base_internal::CountLeadingZeros64(bits);
+ bits <<= (IncludeZero ? clz : (clz & 63)); // remove 0-bits.
+ exp -= clz; // set the exponent.
+ bits >>= (63 - kExp);
+
+ // Construct the 32-bit or 64-bit IEEE 754 floating-point value from
+ // the individual fields: sign, exp, mantissa(bits).
+ uint_type val =
+ (std::is_same<SignedTag, GeneratePositiveTag>::value ? 0u : sign) |
+ (static_cast<uint_type>(exp) << kExp) |
+ (static_cast<uint_type>(bits) & kMask);
+
+ // bit_cast to the output-type
+ real_type result;
+ memcpy(static_cast<void*>(&result), static_cast<const void*>(&val),
+ sizeof(result));
+ return result;
+}
+
+} // namespace random_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_RANDOM_INTERNAL_GENERATE_REAL_H_
diff --git a/third_party/abseil/src/absl/random/internal/generate_real_test.cc b/third_party/abseil/src/absl/random/internal/generate_real_test.cc
new file mode 100644
index 0000000..4bdc453
--- /dev/null
+++ b/third_party/abseil/src/absl/random/internal/generate_real_test.cc
@@ -0,0 +1,497 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/random/internal/generate_real.h"
+
+#include <cfloat>
+#include <cstddef>
+#include <cstdint>
+#include <string>
+
+#include "gtest/gtest.h"
+#include "absl/base/internal/bits.h"
+#include "absl/flags/flag.h"
+
+ABSL_FLAG(int64_t, absl_random_test_trials, 50000,
+ "Number of trials for the probability tests.");
+
+using absl::random_internal::GenerateNegativeTag;
+using absl::random_internal::GeneratePositiveTag;
+using absl::random_internal::GenerateRealFromBits;
+using absl::random_internal::GenerateSignedTag;
+
+namespace {
+
+TEST(GenerateRealTest, U64ToFloat_Positive_NoZero_Test) {
+ auto ToFloat = [](uint64_t a) {
+ return GenerateRealFromBits<float, GeneratePositiveTag, false>(a);
+ };
+ EXPECT_EQ(ToFloat(0x0000000000000000), 2.710505431e-20f);
+ EXPECT_EQ(ToFloat(0x0000000000000001), 5.421010862e-20f);
+ EXPECT_EQ(ToFloat(0x8000000000000000), 0.5);
+ EXPECT_EQ(ToFloat(0x8000000000000001), 0.5);
+ EXPECT_EQ(ToFloat(0xFFFFFFFFFFFFFFFF), 0.9999999404f);
+}
+
+TEST(GenerateRealTest, U64ToFloat_Positive_Zero_Test) {
+ auto ToFloat = [](uint64_t a) {
+ return GenerateRealFromBits<float, GeneratePositiveTag, true>(a);
+ };
+ EXPECT_EQ(ToFloat(0x0000000000000000), 0.0);
+ EXPECT_EQ(ToFloat(0x0000000000000001), 5.421010862e-20f);
+ EXPECT_EQ(ToFloat(0x8000000000000000), 0.5);
+ EXPECT_EQ(ToFloat(0x8000000000000001), 0.5);
+ EXPECT_EQ(ToFloat(0xFFFFFFFFFFFFFFFF), 0.9999999404f);
+}
+
+TEST(GenerateRealTest, U64ToFloat_Negative_NoZero_Test) {
+ auto ToFloat = [](uint64_t a) {
+ return GenerateRealFromBits<float, GenerateNegativeTag, false>(a);
+ };
+ EXPECT_EQ(ToFloat(0x0000000000000000), -2.710505431e-20f);
+ EXPECT_EQ(ToFloat(0x0000000000000001), -5.421010862e-20f);
+ EXPECT_EQ(ToFloat(0x8000000000000000), -0.5);
+ EXPECT_EQ(ToFloat(0x8000000000000001), -0.5);
+ EXPECT_EQ(ToFloat(0xFFFFFFFFFFFFFFFF), -0.9999999404f);
+}
+
+TEST(GenerateRealTest, U64ToFloat_Negative_Zero_Test) {
+ auto ToFloat = [](uint64_t a) {
+ return GenerateRealFromBits<float, GenerateNegativeTag, true>(a);
+ };
+ EXPECT_EQ(ToFloat(0x0000000000000000), 0.0);
+ EXPECT_EQ(ToFloat(0x0000000000000001), -5.421010862e-20f);
+ EXPECT_EQ(ToFloat(0x8000000000000000), -0.5);
+ EXPECT_EQ(ToFloat(0x8000000000000001), -0.5);
+ EXPECT_EQ(ToFloat(0xFFFFFFFFFFFFFFFF), -0.9999999404f);
+}
+
+TEST(GenerateRealTest, U64ToFloat_Signed_NoZero_Test) {
+ auto ToFloat = [](uint64_t a) {
+ return GenerateRealFromBits<float, GenerateSignedTag, false>(a);
+ };
+ EXPECT_EQ(ToFloat(0x0000000000000000), 5.421010862e-20f);
+ EXPECT_EQ(ToFloat(0x0000000000000001), 1.084202172e-19f);
+ EXPECT_EQ(ToFloat(0x7FFFFFFFFFFFFFFF), 0.9999999404f);
+ EXPECT_EQ(ToFloat(0x8000000000000000), -5.421010862e-20f);
+ EXPECT_EQ(ToFloat(0x8000000000000001), -1.084202172e-19f);
+ EXPECT_EQ(ToFloat(0xFFFFFFFFFFFFFFFF), -0.9999999404f);
+}
+
+TEST(GenerateRealTest, U64ToFloat_Signed_Zero_Test) {
+ auto ToFloat = [](uint64_t a) {
+ return GenerateRealFromBits<float, GenerateSignedTag, true>(a);
+ };
+ EXPECT_EQ(ToFloat(0x0000000000000000), 0);
+ EXPECT_EQ(ToFloat(0x0000000000000001), 1.084202172e-19f);
+ EXPECT_EQ(ToFloat(0x7FFFFFFFFFFFFFFF), 0.9999999404f);
+ EXPECT_EQ(ToFloat(0x8000000000000000), 0);
+ EXPECT_EQ(ToFloat(0x8000000000000001), -1.084202172e-19f);
+ EXPECT_EQ(ToFloat(0xFFFFFFFFFFFFFFFF), -0.9999999404f);
+}
+
+TEST(GenerateRealTest, U64ToFloat_Signed_Bias_Test) {
+ auto ToFloat = [](uint64_t a) {
+ return GenerateRealFromBits<float, GenerateSignedTag, true>(a, 1);
+ };
+ EXPECT_EQ(ToFloat(0x0000000000000000), 0);
+ EXPECT_EQ(ToFloat(0x0000000000000001), 2 * 1.084202172e-19f);
+ EXPECT_EQ(ToFloat(0x7FFFFFFFFFFFFFFF), 2 * 0.9999999404f);
+ EXPECT_EQ(ToFloat(0x8000000000000000), 0);
+ EXPECT_EQ(ToFloat(0x8000000000000001), 2 * -1.084202172e-19f);
+ EXPECT_EQ(ToFloat(0xFFFFFFFFFFFFFFFF), 2 * -0.9999999404f);
+}
+
+TEST(GenerateRealTest, U64ToFloatTest) {
+ auto ToFloat = [](uint64_t a) -> float {
+ return GenerateRealFromBits<float, GeneratePositiveTag, true>(a);
+ };
+
+ EXPECT_EQ(ToFloat(0x0000000000000000), 0.0f);
+
+ EXPECT_EQ(ToFloat(0x8000000000000000), 0.5f);
+ EXPECT_EQ(ToFloat(0x8000000000000001), 0.5f);
+ EXPECT_EQ(ToFloat(0x800000FFFFFFFFFF), 0.5f);
+ EXPECT_EQ(ToFloat(0xFFFFFFFFFFFFFFFF), 0.9999999404f);
+
+ EXPECT_GT(ToFloat(0x0000000000000001), 0.0f);
+
+ EXPECT_NE(ToFloat(0x7FFFFF0000000000), ToFloat(0x7FFFFEFFFFFFFFFF));
+
+ EXPECT_LT(ToFloat(0xFFFFFFFFFFFFFFFF), 1.0f);
+ int32_t two_to_24 = 1 << 24;
+ EXPECT_EQ(static_cast<int32_t>(ToFloat(0xFFFFFFFFFFFFFFFF) * two_to_24),
+ two_to_24 - 1);
+ EXPECT_NE(static_cast<int32_t>(ToFloat(0xFFFFFFFFFFFFFFFF) * two_to_24 * 2),
+ two_to_24 * 2 - 1);
+ EXPECT_EQ(ToFloat(0xFFFFFFFFFFFFFFFF), ToFloat(0xFFFFFF0000000000));
+ EXPECT_NE(ToFloat(0xFFFFFFFFFFFFFFFF), ToFloat(0xFFFFFEFFFFFFFFFF));
+ EXPECT_EQ(ToFloat(0x7FFFFFFFFFFFFFFF), ToFloat(0x7FFFFF8000000000));
+ EXPECT_NE(ToFloat(0x7FFFFFFFFFFFFFFF), ToFloat(0x7FFFFF7FFFFFFFFF));
+ EXPECT_EQ(ToFloat(0x3FFFFFFFFFFFFFFF), ToFloat(0x3FFFFFC000000000));
+ EXPECT_NE(ToFloat(0x3FFFFFFFFFFFFFFF), ToFloat(0x3FFFFFBFFFFFFFFF));
+
+ // For values where every bit counts, the values scale as multiples of the
+ // input.
+ for (int i = 0; i < 100; ++i) {
+ EXPECT_EQ(i * ToFloat(0x0000000000000001), ToFloat(i));
+ }
+
+ // For each i: value generated from (1 << i).
+ float exp_values[64];
+ exp_values[63] = 0.5f;
+ for (int i = 62; i >= 0; --i) exp_values[i] = 0.5f * exp_values[i + 1];
+ constexpr uint64_t one = 1;
+ for (int i = 0; i < 64; ++i) {
+ EXPECT_EQ(ToFloat(one << i), exp_values[i]);
+ for (int j = 1; j < FLT_MANT_DIG && i - j >= 0; ++j) {
+ EXPECT_NE(exp_values[i] + exp_values[i - j], exp_values[i]);
+ EXPECT_EQ(ToFloat((one << i) + (one << (i - j))),
+ exp_values[i] + exp_values[i - j]);
+ }
+ for (int j = FLT_MANT_DIG; i - j >= 0; ++j) {
+ EXPECT_EQ(exp_values[i] + exp_values[i - j], exp_values[i]);
+ EXPECT_EQ(ToFloat((one << i) + (one << (i - j))), exp_values[i]);
+ }
+ }
+}
+
+TEST(GenerateRealTest, U64ToDouble_Positive_NoZero_Test) {
+ auto ToDouble = [](uint64_t a) {
+ return GenerateRealFromBits<double, GeneratePositiveTag, false>(a);
+ };
+
+ EXPECT_EQ(ToDouble(0x0000000000000000), 2.710505431213761085e-20);
+ EXPECT_EQ(ToDouble(0x0000000000000001), 5.42101086242752217004e-20);
+ EXPECT_EQ(ToDouble(0x0000000000000002), 1.084202172485504434e-19);
+ EXPECT_EQ(ToDouble(0x8000000000000000), 0.5);
+ EXPECT_EQ(ToDouble(0x8000000000000001), 0.5);
+ EXPECT_EQ(ToDouble(0xFFFFFFFFFFFFFFFF), 0.999999999999999888978);
+}
+
+TEST(GenerateRealTest, U64ToDouble_Positive_Zero_Test) {
+ auto ToDouble = [](uint64_t a) {
+ return GenerateRealFromBits<double, GeneratePositiveTag, true>(a);
+ };
+
+ EXPECT_EQ(ToDouble(0x0000000000000000), 0.0);
+ EXPECT_EQ(ToDouble(0x0000000000000001), 5.42101086242752217004e-20);
+ EXPECT_EQ(ToDouble(0x8000000000000000), 0.5);
+ EXPECT_EQ(ToDouble(0x8000000000000001), 0.5);
+ EXPECT_EQ(ToDouble(0xFFFFFFFFFFFFFFFF), 0.999999999999999888978);
+}
+
+TEST(GenerateRealTest, U64ToDouble_Negative_NoZero_Test) {
+ auto ToDouble = [](uint64_t a) {
+ return GenerateRealFromBits<double, GenerateNegativeTag, false>(a);
+ };
+
+ EXPECT_EQ(ToDouble(0x0000000000000000), -2.710505431213761085e-20);
+ EXPECT_EQ(ToDouble(0x0000000000000001), -5.42101086242752217004e-20);
+ EXPECT_EQ(ToDouble(0x0000000000000002), -1.084202172485504434e-19);
+ EXPECT_EQ(ToDouble(0x8000000000000000), -0.5);
+ EXPECT_EQ(ToDouble(0x8000000000000001), -0.5);
+ EXPECT_EQ(ToDouble(0xFFFFFFFFFFFFFFFF), -0.999999999999999888978);
+}
+
+TEST(GenerateRealTest, U64ToDouble_Negative_Zero_Test) {
+ auto ToDouble = [](uint64_t a) {
+ return GenerateRealFromBits<double, GenerateNegativeTag, true>(a);
+ };
+
+ EXPECT_EQ(ToDouble(0x0000000000000000), 0.0);
+ EXPECT_EQ(ToDouble(0x0000000000000001), -5.42101086242752217004e-20);
+ EXPECT_EQ(ToDouble(0x0000000000000002), -1.084202172485504434e-19);
+ EXPECT_EQ(ToDouble(0x8000000000000000), -0.5);
+ EXPECT_EQ(ToDouble(0x8000000000000001), -0.5);
+ EXPECT_EQ(ToDouble(0xFFFFFFFFFFFFFFFF), -0.999999999999999888978);
+}
+
+TEST(GenerateRealTest, U64ToDouble_Signed_NoZero_Test) {
+ auto ToDouble = [](uint64_t a) {
+ return GenerateRealFromBits<double, GenerateSignedTag, false>(a);
+ };
+
+ EXPECT_EQ(ToDouble(0x0000000000000000), 5.42101086242752217004e-20);
+ EXPECT_EQ(ToDouble(0x0000000000000001), 1.084202172485504434e-19);
+ EXPECT_EQ(ToDouble(0x7FFFFFFFFFFFFFFF), 0.999999999999999888978);
+ EXPECT_EQ(ToDouble(0x8000000000000000), -5.42101086242752217004e-20);
+ EXPECT_EQ(ToDouble(0x8000000000000001), -1.084202172485504434e-19);
+ EXPECT_EQ(ToDouble(0xFFFFFFFFFFFFFFFF), -0.999999999999999888978);
+}
+
+TEST(GenerateRealTest, U64ToDouble_Signed_Zero_Test) {
+ auto ToDouble = [](uint64_t a) {
+ return GenerateRealFromBits<double, GenerateSignedTag, true>(a);
+ };
+ EXPECT_EQ(ToDouble(0x0000000000000000), 0);
+ EXPECT_EQ(ToDouble(0x0000000000000001), 1.084202172485504434e-19);
+ EXPECT_EQ(ToDouble(0x7FFFFFFFFFFFFFFF), 0.999999999999999888978);
+ EXPECT_EQ(ToDouble(0x8000000000000000), 0);
+ EXPECT_EQ(ToDouble(0x8000000000000001), -1.084202172485504434e-19);
+ EXPECT_EQ(ToDouble(0xFFFFFFFFFFFFFFFF), -0.999999999999999888978);
+}
+
+TEST(GenerateRealTest, U64ToDouble_GenerateSignedTag_Bias_Test) {
+ auto ToDouble = [](uint64_t a) {
+ return GenerateRealFromBits<double, GenerateSignedTag, true>(a, -1);
+ };
+ EXPECT_EQ(ToDouble(0x0000000000000000), 0);
+ EXPECT_EQ(ToDouble(0x0000000000000001), 1.084202172485504434e-19 / 2);
+ EXPECT_EQ(ToDouble(0x7FFFFFFFFFFFFFFF), 0.999999999999999888978 / 2);
+ EXPECT_EQ(ToDouble(0x8000000000000000), 0);
+ EXPECT_EQ(ToDouble(0x8000000000000001), -1.084202172485504434e-19 / 2);
+ EXPECT_EQ(ToDouble(0xFFFFFFFFFFFFFFFF), -0.999999999999999888978 / 2);
+}
+
+TEST(GenerateRealTest, U64ToDoubleTest) {
+ auto ToDouble = [](uint64_t a) {
+ return GenerateRealFromBits<double, GeneratePositiveTag, true>(a);
+ };
+
+ EXPECT_EQ(ToDouble(0x0000000000000000), 0.0);
+ EXPECT_EQ(ToDouble(0x0000000000000000), 0.0);
+
+ EXPECT_EQ(ToDouble(0x0000000000000001), 5.42101086242752217004e-20);
+ EXPECT_EQ(ToDouble(0x7fffffffffffffef), 0.499999999999999944489);
+ EXPECT_EQ(ToDouble(0x8000000000000000), 0.5);
+
+ // For values > 0.5, RandU64ToDouble discards up to 11 bits. (64-53).
+ EXPECT_EQ(ToDouble(0x8000000000000001), 0.5);
+ EXPECT_EQ(ToDouble(0x80000000000007FF), 0.5);
+ EXPECT_EQ(ToDouble(0xFFFFFFFFFFFFFFFF), 0.999999999999999888978);
+ EXPECT_NE(ToDouble(0x7FFFFFFFFFFFF800), ToDouble(0x7FFFFFFFFFFFF7FF));
+
+ EXPECT_LT(ToDouble(0xFFFFFFFFFFFFFFFF), 1.0);
+ EXPECT_EQ(ToDouble(0xFFFFFFFFFFFFFFFF), ToDouble(0xFFFFFFFFFFFFF800));
+ EXPECT_NE(ToDouble(0xFFFFFFFFFFFFFFFF), ToDouble(0xFFFFFFFFFFFFF7FF));
+ EXPECT_EQ(ToDouble(0x7FFFFFFFFFFFFFFF), ToDouble(0x7FFFFFFFFFFFFC00));
+ EXPECT_NE(ToDouble(0x7FFFFFFFFFFFFFFF), ToDouble(0x7FFFFFFFFFFFFBFF));
+ EXPECT_EQ(ToDouble(0x3FFFFFFFFFFFFFFF), ToDouble(0x3FFFFFFFFFFFFE00));
+ EXPECT_NE(ToDouble(0x3FFFFFFFFFFFFFFF), ToDouble(0x3FFFFFFFFFFFFDFF));
+
+ EXPECT_EQ(ToDouble(0x1000000000000001), 0.0625);
+ EXPECT_EQ(ToDouble(0x2000000000000001), 0.125);
+ EXPECT_EQ(ToDouble(0x3000000000000001), 0.1875);
+ EXPECT_EQ(ToDouble(0x4000000000000001), 0.25);
+ EXPECT_EQ(ToDouble(0x5000000000000001), 0.3125);
+ EXPECT_EQ(ToDouble(0x6000000000000001), 0.375);
+ EXPECT_EQ(ToDouble(0x7000000000000001), 0.4375);
+ EXPECT_EQ(ToDouble(0x8000000000000001), 0.5);
+ EXPECT_EQ(ToDouble(0x9000000000000001), 0.5625);
+ EXPECT_EQ(ToDouble(0xa000000000000001), 0.625);
+ EXPECT_EQ(ToDouble(0xb000000000000001), 0.6875);
+ EXPECT_EQ(ToDouble(0xc000000000000001), 0.75);
+ EXPECT_EQ(ToDouble(0xd000000000000001), 0.8125);
+ EXPECT_EQ(ToDouble(0xe000000000000001), 0.875);
+ EXPECT_EQ(ToDouble(0xf000000000000001), 0.9375);
+
+ // Large powers of 2.
+ int64_t two_to_53 = int64_t{1} << 53;
+ EXPECT_EQ(static_cast<int64_t>(ToDouble(0xFFFFFFFFFFFFFFFF) * two_to_53),
+ two_to_53 - 1);
+ EXPECT_NE(static_cast<int64_t>(ToDouble(0xFFFFFFFFFFFFFFFF) * two_to_53 * 2),
+ two_to_53 * 2 - 1);
+
+ // For values where every bit counts, the values scale as multiples of the
+ // input.
+ for (int i = 0; i < 100; ++i) {
+ EXPECT_EQ(i * ToDouble(0x0000000000000001), ToDouble(i));
+ }
+
+ // For each i: value generated from (1 << i).
+ double exp_values[64];
+ exp_values[63] = 0.5;
+ for (int i = 62; i >= 0; --i) exp_values[i] = 0.5 * exp_values[i + 1];
+ constexpr uint64_t one = 1;
+ for (int i = 0; i < 64; ++i) {
+ EXPECT_EQ(ToDouble(one << i), exp_values[i]);
+ for (int j = 1; j < DBL_MANT_DIG && i - j >= 0; ++j) {
+ EXPECT_NE(exp_values[i] + exp_values[i - j], exp_values[i]);
+ EXPECT_EQ(ToDouble((one << i) + (one << (i - j))),
+ exp_values[i] + exp_values[i - j]);
+ }
+ for (int j = DBL_MANT_DIG; i - j >= 0; ++j) {
+ EXPECT_EQ(exp_values[i] + exp_values[i - j], exp_values[i]);
+ EXPECT_EQ(ToDouble((one << i) + (one << (i - j))), exp_values[i]);
+ }
+ }
+}
+
+TEST(GenerateRealTest, U64ToDoubleSignedTest) {
+ auto ToDouble = [](uint64_t a) {
+ return GenerateRealFromBits<double, GenerateSignedTag, false>(a);
+ };
+
+ EXPECT_EQ(ToDouble(0x0000000000000000), 5.42101086242752217004e-20);
+ EXPECT_EQ(ToDouble(0x0000000000000001), 1.084202172485504434e-19);
+
+ EXPECT_EQ(ToDouble(0x8000000000000000), -5.42101086242752217004e-20);
+ EXPECT_EQ(ToDouble(0x8000000000000001), -1.084202172485504434e-19);
+
+ const double e_plus = ToDouble(0x0000000000000001);
+ const double e_minus = ToDouble(0x8000000000000001);
+ EXPECT_EQ(e_plus, 1.084202172485504434e-19);
+ EXPECT_EQ(e_minus, -1.084202172485504434e-19);
+
+ EXPECT_EQ(ToDouble(0x3fffffffffffffef), 0.499999999999999944489);
+ EXPECT_EQ(ToDouble(0xbfffffffffffffef), -0.499999999999999944489);
+
+ // For values > 0.5, RandU64ToDouble discards up to 10 bits. (63-53).
+ EXPECT_EQ(ToDouble(0x4000000000000000), 0.5);
+ EXPECT_EQ(ToDouble(0x4000000000000001), 0.5);
+ EXPECT_EQ(ToDouble(0x40000000000003FF), 0.5);
+
+ EXPECT_EQ(ToDouble(0xC000000000000000), -0.5);
+ EXPECT_EQ(ToDouble(0xC000000000000001), -0.5);
+ EXPECT_EQ(ToDouble(0xC0000000000003FF), -0.5);
+
+ EXPECT_EQ(ToDouble(0x7FFFFFFFFFFFFFFe), 0.999999999999999888978);
+ EXPECT_EQ(ToDouble(0xFFFFFFFFFFFFFFFe), -0.999999999999999888978);
+
+ EXPECT_NE(ToDouble(0x7FFFFFFFFFFFF800), ToDouble(0x7FFFFFFFFFFFF7FF));
+
+ EXPECT_LT(ToDouble(0x7FFFFFFFFFFFFFFF), 1.0);
+ EXPECT_GT(ToDouble(0x7FFFFFFFFFFFFFFF), 0.9999999999);
+
+ EXPECT_GT(ToDouble(0xFFFFFFFFFFFFFFFe), -1.0);
+ EXPECT_LT(ToDouble(0xFFFFFFFFFFFFFFFe), -0.999999999);
+
+ EXPECT_EQ(ToDouble(0xFFFFFFFFFFFFFFFe), ToDouble(0xFFFFFFFFFFFFFC00));
+ EXPECT_EQ(ToDouble(0x7FFFFFFFFFFFFFFF), ToDouble(0x7FFFFFFFFFFFFC00));
+ EXPECT_NE(ToDouble(0xFFFFFFFFFFFFFFFe), ToDouble(0xFFFFFFFFFFFFF3FF));
+ EXPECT_NE(ToDouble(0x7FFFFFFFFFFFFFFF), ToDouble(0x7FFFFFFFFFFFF3FF));
+
+ EXPECT_EQ(ToDouble(0x1000000000000001), 0.125);
+ EXPECT_EQ(ToDouble(0x2000000000000001), 0.25);
+ EXPECT_EQ(ToDouble(0x3000000000000001), 0.375);
+ EXPECT_EQ(ToDouble(0x4000000000000001), 0.5);
+ EXPECT_EQ(ToDouble(0x5000000000000001), 0.625);
+ EXPECT_EQ(ToDouble(0x6000000000000001), 0.75);
+ EXPECT_EQ(ToDouble(0x7000000000000001), 0.875);
+ EXPECT_EQ(ToDouble(0x7800000000000001), 0.9375);
+ EXPECT_EQ(ToDouble(0x7c00000000000001), 0.96875);
+ EXPECT_EQ(ToDouble(0x7e00000000000001), 0.984375);
+ EXPECT_EQ(ToDouble(0x7f00000000000001), 0.9921875);
+
+ // 0x8000000000000000 ~= 0
+ EXPECT_EQ(ToDouble(0x9000000000000001), -0.125);
+ EXPECT_EQ(ToDouble(0xa000000000000001), -0.25);
+ EXPECT_EQ(ToDouble(0xb000000000000001), -0.375);
+ EXPECT_EQ(ToDouble(0xc000000000000001), -0.5);
+ EXPECT_EQ(ToDouble(0xd000000000000001), -0.625);
+ EXPECT_EQ(ToDouble(0xe000000000000001), -0.75);
+ EXPECT_EQ(ToDouble(0xf000000000000001), -0.875);
+
+ // Large powers of 2.
+ int64_t two_to_53 = int64_t{1} << 53;
+ EXPECT_EQ(static_cast<int64_t>(ToDouble(0x7FFFFFFFFFFFFFFF) * two_to_53),
+ two_to_53 - 1);
+ EXPECT_EQ(static_cast<int64_t>(ToDouble(0xFFFFFFFFFFFFFFFF) * two_to_53),
+ -(two_to_53 - 1));
+
+ EXPECT_NE(static_cast<int64_t>(ToDouble(0x7FFFFFFFFFFFFFFF) * two_to_53 * 2),
+ two_to_53 * 2 - 1);
+
+ // For values where every bit counts, the values scale as multiples of the
+ // input.
+ for (int i = 1; i < 100; ++i) {
+ EXPECT_EQ(i * e_plus, ToDouble(i)) << i;
+ EXPECT_EQ(i * e_minus, ToDouble(0x8000000000000000 | i)) << i;
+ }
+}
+
+TEST(GenerateRealTest, ExhaustiveFloat) {
+ using absl::base_internal::CountLeadingZeros64;
+ auto ToFloat = [](uint64_t a) {
+ return GenerateRealFromBits<float, GeneratePositiveTag, true>(a);
+ };
+
+ // Rely on RandU64ToFloat generating values from greatest to least when
+ // supplied with uint64_t values from greatest (0xfff...) to least (0x0).
+ // Thus, this algorithm stores the previous value, and if the new value is at
+ // greater than or equal to the previous value, then there is a collision in
+ // the generation algorithm.
+ //
+ // Use the computation below to convert the random value into a result:
+ // double res = a() * (1.0f - sample) + b() * sample;
+ float last_f = 1.0, last_g = 2.0;
+ uint64_t f_collisions = 0, g_collisions = 0;
+ uint64_t f_unique = 0, g_unique = 0;
+ uint64_t total = 0;
+ auto count = [&](const float r) {
+ total++;
+ // `f` is mapped to the range [0, 1) (default)
+ const float f = 0.0f * (1.0f - r) + 1.0f * r;
+ if (f >= last_f) {
+ f_collisions++;
+ } else {
+ f_unique++;
+ last_f = f;
+ }
+ // `g` is mapped to the range [1, 2)
+ const float g = 1.0f * (1.0f - r) + 2.0f * r;
+ if (g >= last_g) {
+ g_collisions++;
+ } else {
+ g_unique++;
+ last_g = g;
+ }
+ };
+
+ size_t limit = absl::GetFlag(FLAGS_absl_random_test_trials);
+
+ // Generate all uint64_t which have unique floating point values.
+ // Counting down from 0xFFFFFFFFFFFFFFFFu ... 0x0u
+ uint64_t x = ~uint64_t(0);
+ for (; x != 0 && limit > 0;) {
+ constexpr int kDig = (64 - FLT_MANT_DIG);
+ // Set a decrement value & the next point at which to change
+ // the decrement value. By default these are 1, 0.
+ uint64_t dec = 1;
+ uint64_t chk = 0;
+
+ // Adjust decrement and check value based on how many leading 0
+ // bits are set in the current value.
+ const int clz = CountLeadingZeros64(x);
+ if (clz < kDig) {
+ dec <<= (kDig - clz);
+ chk = (~uint64_t(0)) >> (clz + 1);
+ }
+ for (; x > chk && limit > 0; x -= dec) {
+ count(ToFloat(x));
+ --limit;
+ }
+ }
+
+ static_assert(FLT_MANT_DIG == 24,
+ "The float type is expected to have a 24 bit mantissa.");
+
+ if (limit != 0) {
+ // There are between 2^28 and 2^29 unique values in the range [0, 1). For
+ // the low values of x, there are 2^24 -1 unique values. Once x > 2^24,
+ // there are 40 * 2^24 unique values. Thus:
+ // (2 + 4 + 8 ... + 2^23) + 40 * 2^23
+ EXPECT_LT(1 << 28, f_unique);
+ EXPECT_EQ((1 << 24) + 40 * (1 << 23) - 1, f_unique);
+ EXPECT_EQ(total, f_unique);
+ EXPECT_EQ(0, f_collisions);
+
+ // Expect at least 2^23 unique values for the range [1, 2)
+ EXPECT_LE(1 << 23, g_unique);
+ EXPECT_EQ(total - g_unique, g_collisions);
+ }
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/random/internal/iostream_state_saver.h b/third_party/abseil/src/absl/random/internal/iostream_state_saver.h
new file mode 100644
index 0000000..e6e242e
--- /dev/null
+++ b/third_party/abseil/src/absl/random/internal/iostream_state_saver.h
@@ -0,0 +1,245 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_RANDOM_INTERNAL_IOSTREAM_STATE_SAVER_H_
+#define ABSL_RANDOM_INTERNAL_IOSTREAM_STATE_SAVER_H_
+
+#include <cmath>
+#include <iostream>
+#include <limits>
+#include <type_traits>
+
+#include "absl/meta/type_traits.h"
+#include "absl/numeric/int128.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace random_internal {
+
+// The null_state_saver does nothing.
+template <typename T>
+class null_state_saver {
+ public:
+ using stream_type = T;
+ using flags_type = std::ios_base::fmtflags;
+
+ null_state_saver(T&, flags_type) {}
+ ~null_state_saver() {}
+};
+
+// ostream_state_saver is a RAII object to save and restore the common
+// basic_ostream flags used when implementing `operator <<()` on any of
+// the absl random distributions.
+template <typename OStream>
+class ostream_state_saver {
+ public:
+ using ostream_type = OStream;
+ using flags_type = std::ios_base::fmtflags;
+ using fill_type = typename ostream_type::char_type;
+ using precision_type = std::streamsize;
+
+ ostream_state_saver(ostream_type& os, // NOLINT(runtime/references)
+ flags_type flags, fill_type fill)
+ : os_(os),
+ flags_(os.flags(flags)),
+ fill_(os.fill(fill)),
+ precision_(os.precision()) {
+ // Save state in initialized variables.
+ }
+
+ ~ostream_state_saver() {
+ // Restore saved state.
+ os_.precision(precision_);
+ os_.fill(fill_);
+ os_.flags(flags_);
+ }
+
+ private:
+ ostream_type& os_;
+ const flags_type flags_;
+ const fill_type fill_;
+ const precision_type precision_;
+};
+
+#if defined(__NDK_MAJOR__) && __NDK_MAJOR__ < 16
+#define ABSL_RANDOM_INTERNAL_IOSTREAM_HEXFLOAT 1
+#else
+#define ABSL_RANDOM_INTERNAL_IOSTREAM_HEXFLOAT 0
+#endif
+
+template <typename CharT, typename Traits>
+ostream_state_saver<std::basic_ostream<CharT, Traits>> make_ostream_state_saver(
+ std::basic_ostream<CharT, Traits>& os, // NOLINT(runtime/references)
+ std::ios_base::fmtflags flags = std::ios_base::dec | std::ios_base::left |
+#if ABSL_RANDOM_INTERNAL_IOSTREAM_HEXFLOAT
+ std::ios_base::fixed |
+#endif
+ std::ios_base::scientific) {
+ using result_type = ostream_state_saver<std::basic_ostream<CharT, Traits>>;
+ return result_type(os, flags, os.widen(' '));
+}
+
+template <typename T>
+typename absl::enable_if_t<!std::is_base_of<std::ios_base, T>::value,
+ null_state_saver<T>>
+make_ostream_state_saver(T& is, // NOLINT(runtime/references)
+ std::ios_base::fmtflags flags = std::ios_base::dec) {
+ std::cerr << "null_state_saver";
+ using result_type = null_state_saver<T>;
+ return result_type(is, flags);
+}
+
+// stream_precision_helper<type>::kPrecision returns the base 10 precision
+// required to stream and reconstruct a real type exact binary value through
+// a binary->decimal->binary transition.
+template <typename T>
+struct stream_precision_helper {
+ // max_digits10 may be 0 on MSVC; if so, use digits10 + 3.
+ static constexpr int kPrecision =
+ (std::numeric_limits<T>::max_digits10 > std::numeric_limits<T>::digits10)
+ ? std::numeric_limits<T>::max_digits10
+ : (std::numeric_limits<T>::digits10 + 3);
+};
+
+template <>
+struct stream_precision_helper<float> {
+ static constexpr int kPrecision = 9;
+};
+template <>
+struct stream_precision_helper<double> {
+ static constexpr int kPrecision = 17;
+};
+template <>
+struct stream_precision_helper<long double> {
+ static constexpr int kPrecision = 36; // assuming fp128
+};
+
+// istream_state_saver is a RAII object to save and restore the common
+// std::basic_istream<> flags used when implementing `operator >>()` on any of
+// the absl random distributions.
+template <typename IStream>
+class istream_state_saver {
+ public:
+ using istream_type = IStream;
+ using flags_type = std::ios_base::fmtflags;
+
+ istream_state_saver(istream_type& is, // NOLINT(runtime/references)
+ flags_type flags)
+ : is_(is), flags_(is.flags(flags)) {}
+
+ ~istream_state_saver() { is_.flags(flags_); }
+
+ private:
+ istream_type& is_;
+ flags_type flags_;
+};
+
+template <typename CharT, typename Traits>
+istream_state_saver<std::basic_istream<CharT, Traits>> make_istream_state_saver(
+ std::basic_istream<CharT, Traits>& is, // NOLINT(runtime/references)
+ std::ios_base::fmtflags flags = std::ios_base::dec |
+ std::ios_base::scientific |
+ std::ios_base::skipws) {
+ using result_type = istream_state_saver<std::basic_istream<CharT, Traits>>;
+ return result_type(is, flags);
+}
+
+template <typename T>
+typename absl::enable_if_t<!std::is_base_of<std::ios_base, T>::value,
+ null_state_saver<T>>
+make_istream_state_saver(T& is, // NOLINT(runtime/references)
+ std::ios_base::fmtflags flags = std::ios_base::dec) {
+ using result_type = null_state_saver<T>;
+ return result_type(is, flags);
+}
+
+// stream_format_type<T> is a helper struct to convert types which
+// basic_iostream cannot output as decimal numbers into types which
+// basic_iostream can output as decimal numbers. Specifically:
+// * signed/unsigned char-width types are converted to int.
+// * TODO(lar): __int128 => uint128, except there is no operator << yet.
+//
+template <typename T>
+struct stream_format_type
+ : public std::conditional<(sizeof(T) == sizeof(char)), int, T> {};
+
+// stream_u128_helper allows us to write out either absl::uint128 or
+// __uint128_t types in the same way, which enables their use as internal
+// state of PRNG engines.
+template <typename T>
+struct stream_u128_helper;
+
+template <>
+struct stream_u128_helper<absl::uint128> {
+ template <typename IStream>
+ inline absl::uint128 read(IStream& in) {
+ uint64_t h = 0;
+ uint64_t l = 0;
+ in >> h >> l;
+ return absl::MakeUint128(h, l);
+ }
+
+ template <typename OStream>
+ inline void write(absl::uint128 val, OStream& out) {
+ uint64_t h = absl::Uint128High64(val);
+ uint64_t l = absl::Uint128Low64(val);
+ out << h << out.fill() << l;
+ }
+};
+
+#ifdef ABSL_HAVE_INTRINSIC_INT128
+template <>
+struct stream_u128_helper<__uint128_t> {
+ template <typename IStream>
+ inline __uint128_t read(IStream& in) {
+ uint64_t h = 0;
+ uint64_t l = 0;
+ in >> h >> l;
+ return (static_cast<__uint128_t>(h) << 64) | l;
+ }
+
+ template <typename OStream>
+ inline void write(__uint128_t val, OStream& out) {
+ uint64_t h = static_cast<uint64_t>(val >> 64u);
+ uint64_t l = static_cast<uint64_t>(val);
+ out << h << out.fill() << l;
+ }
+};
+#endif
+
+template <typename FloatType, typename IStream>
+inline FloatType read_floating_point(IStream& is) {
+ static_assert(std::is_floating_point<FloatType>::value, "");
+ FloatType dest;
+ is >> dest;
+ // Parsing a double value may report a subnormal value as an error
+ // despite being able to represent it.
+ // See https://stackoverflow.com/q/52410931/3286653
+ // It may also report an underflow when parsing DOUBLE_MIN as an
+ // ERANGE error, as the parsed value may be smaller than DOUBLE_MIN
+ // and rounded up.
+ // See: https://stackoverflow.com/q/42005462
+ if (is.fail() &&
+ (std::fabs(dest) == (std::numeric_limits<FloatType>::min)() ||
+ std::fpclassify(dest) == FP_SUBNORMAL)) {
+ is.clear(is.rdstate() & (~std::ios_base::failbit));
+ }
+ return dest;
+}
+
+} // namespace random_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_RANDOM_INTERNAL_IOSTREAM_STATE_SAVER_H_
diff --git a/third_party/abseil/src/absl/random/internal/iostream_state_saver_test.cc b/third_party/abseil/src/absl/random/internal/iostream_state_saver_test.cc
new file mode 100644
index 0000000..7bb8ad9
--- /dev/null
+++ b/third_party/abseil/src/absl/random/internal/iostream_state_saver_test.cc
@@ -0,0 +1,371 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/random/internal/iostream_state_saver.h"
+
+#include <sstream>
+#include <string>
+
+#include "gtest/gtest.h"
+
+namespace {
+
+using absl::random_internal::make_istream_state_saver;
+using absl::random_internal::make_ostream_state_saver;
+using absl::random_internal::stream_precision_helper;
+
+template <typename T>
+typename absl::enable_if_t<std::is_integral<T>::value, T> //
+StreamRoundTrip(T t) {
+ std::stringstream ss;
+ {
+ auto saver = make_ostream_state_saver(ss);
+ ss.precision(stream_precision_helper<T>::kPrecision);
+ ss << t;
+ }
+ T result = 0;
+ {
+ auto saver = make_istream_state_saver(ss);
+ ss >> result;
+ }
+ EXPECT_FALSE(ss.fail()) //
+ << ss.str() << " " //
+ << (ss.good() ? "good " : "") //
+ << (ss.bad() ? "bad " : "") //
+ << (ss.eof() ? "eof " : "") //
+ << (ss.fail() ? "fail " : "");
+
+ return result;
+}
+
+template <typename T>
+typename absl::enable_if_t<std::is_floating_point<T>::value, T> //
+StreamRoundTrip(T t) {
+ std::stringstream ss;
+ {
+ auto saver = make_ostream_state_saver(ss);
+ ss.precision(stream_precision_helper<T>::kPrecision);
+ ss << t;
+ }
+ T result = 0;
+ {
+ auto saver = make_istream_state_saver(ss);
+ result = absl::random_internal::read_floating_point<T>(ss);
+ }
+ EXPECT_FALSE(ss.fail()) //
+ << ss.str() << " " //
+ << (ss.good() ? "good " : "") //
+ << (ss.bad() ? "bad " : "") //
+ << (ss.eof() ? "eof " : "") //
+ << (ss.fail() ? "fail " : "");
+
+ return result;
+}
+
+TEST(IOStreamStateSaver, BasicSaverState) {
+ std::stringstream ss;
+ ss.precision(2);
+ ss.fill('x');
+ ss.flags(std::ios_base::dec | std::ios_base::right);
+
+ {
+ auto saver = make_ostream_state_saver(ss);
+ ss.precision(10);
+ EXPECT_NE('x', ss.fill());
+ EXPECT_EQ(10, ss.precision());
+ EXPECT_NE(std::ios_base::dec | std::ios_base::right, ss.flags());
+
+ ss << 1.23;
+ }
+
+ EXPECT_EQ('x', ss.fill());
+ EXPECT_EQ(2, ss.precision());
+ EXPECT_EQ(std::ios_base::dec | std::ios_base::right, ss.flags());
+}
+
+TEST(IOStreamStateSaver, RoundTripInts) {
+ const uint64_t kUintValues[] = {
+ 0,
+ 1,
+ static_cast<uint64_t>(-1),
+ 2,
+ static_cast<uint64_t>(-2),
+
+ 1 << 7,
+ 1 << 8,
+ 1 << 16,
+ 1ull << 32,
+ 1ull << 50,
+ 1ull << 62,
+ 1ull << 63,
+
+ (1 << 7) - 1,
+ (1 << 8) - 1,
+ (1 << 16) - 1,
+ (1ull << 32) - 1,
+ (1ull << 50) - 1,
+ (1ull << 62) - 1,
+ (1ull << 63) - 1,
+
+ static_cast<uint64_t>(-(1 << 8)),
+ static_cast<uint64_t>(-(1 << 16)),
+ static_cast<uint64_t>(-(1ll << 32)),
+ static_cast<uint64_t>(-(1ll << 50)),
+ static_cast<uint64_t>(-(1ll << 62)),
+
+ static_cast<uint64_t>(-(1 << 8) - 1),
+ static_cast<uint64_t>(-(1 << 16) - 1),
+ static_cast<uint64_t>(-(1ll << 32) - 1),
+ static_cast<uint64_t>(-(1ll << 50) - 1),
+ static_cast<uint64_t>(-(1ll << 62) - 1),
+ };
+
+ for (const uint64_t u : kUintValues) {
+ EXPECT_EQ(u, StreamRoundTrip<uint64_t>(u));
+
+ int64_t x = static_cast<int64_t>(u);
+ EXPECT_EQ(x, StreamRoundTrip<int64_t>(x));
+
+ double d = static_cast<double>(x);
+ EXPECT_EQ(d, StreamRoundTrip<double>(d));
+
+ float f = d;
+ EXPECT_EQ(f, StreamRoundTrip<float>(f));
+ }
+}
+
+TEST(IOStreamStateSaver, RoundTripFloats) {
+ static_assert(
+ stream_precision_helper<float>::kPrecision >= 9,
+ "stream_precision_helper<float>::kPrecision should be at least 9");
+
+ const float kValues[] = {
+ 1,
+ std::nextafter(1.0f, 0.0f), // 1 - epsilon
+ std::nextafter(1.0f, 2.0f), // 1 + epsilon
+
+ 1.0e+1f,
+ 1.0e-1f,
+ 1.0e+2f,
+ 1.0e-2f,
+ 1.0e+10f,
+ 1.0e-10f,
+
+ 0.00000051110000111311111111f,
+ -0.00000051110000111211111111f,
+
+ 1.234678912345678912345e+6f,
+ 1.234678912345678912345e-6f,
+ 1.234678912345678912345e+30f,
+ 1.234678912345678912345e-30f,
+ 1.234678912345678912345e+38f,
+ 1.0234678912345678912345e-38f,
+
+ // Boundary cases.
+ std::numeric_limits<float>::max(),
+ std::numeric_limits<float>::lowest(),
+ std::numeric_limits<float>::epsilon(),
+ std::nextafter(std::numeric_limits<float>::min(),
+ 1.0f), // min + epsilon
+ std::numeric_limits<float>::min(), // smallest normal
+ // There are some errors dealing with denorms on apple platforms.
+ std::numeric_limits<float>::denorm_min(), // smallest denorm
+ std::numeric_limits<float>::min() / 2,
+ std::nextafter(std::numeric_limits<float>::min(),
+ 0.0f), // denorm_max
+ std::nextafter(std::numeric_limits<float>::denorm_min(), 1.0f),
+ };
+
+ for (const float f : kValues) {
+ EXPECT_EQ(f, StreamRoundTrip<float>(f));
+ EXPECT_EQ(-f, StreamRoundTrip<float>(-f));
+
+ double d = f;
+ EXPECT_EQ(d, StreamRoundTrip<double>(d));
+ EXPECT_EQ(-d, StreamRoundTrip<double>(-d));
+
+ // Avoid undefined behavior (overflow/underflow).
+ if (f <= static_cast<float>(std::numeric_limits<int64_t>::max()) &&
+ f >= static_cast<float>(std::numeric_limits<int64_t>::lowest())) {
+ int64_t x = static_cast<int64_t>(f);
+ EXPECT_EQ(x, StreamRoundTrip<int64_t>(x));
+ }
+ }
+}
+
+TEST(IOStreamStateSaver, RoundTripDoubles) {
+ static_assert(
+ stream_precision_helper<double>::kPrecision >= 17,
+ "stream_precision_helper<double>::kPrecision should be at least 17");
+
+ const double kValues[] = {
+ 1,
+ std::nextafter(1.0, 0.0), // 1 - epsilon
+ std::nextafter(1.0, 2.0), // 1 + epsilon
+
+ 1.0e+1,
+ 1.0e-1,
+ 1.0e+2,
+ 1.0e-2,
+ 1.0e+10,
+ 1.0e-10,
+
+ 0.00000051110000111311111111,
+ -0.00000051110000111211111111,
+
+ 1.234678912345678912345e+6,
+ 1.234678912345678912345e-6,
+ 1.234678912345678912345e+30,
+ 1.234678912345678912345e-30,
+ 1.234678912345678912345e+38,
+ 1.0234678912345678912345e-38,
+
+ 1.0e+100,
+ 1.0e-100,
+ 1.234678912345678912345e+308,
+ 1.0234678912345678912345e-308,
+ 2.22507385850720138e-308,
+
+ // Boundary cases.
+ std::numeric_limits<double>::max(),
+ std::numeric_limits<double>::lowest(),
+ std::numeric_limits<double>::epsilon(),
+ std::nextafter(std::numeric_limits<double>::min(),
+ 1.0), // min + epsilon
+ std::numeric_limits<double>::min(), // smallest normal
+ // There are some errors dealing with denorms on apple platforms.
+ std::numeric_limits<double>::denorm_min(), // smallest denorm
+ std::numeric_limits<double>::min() / 2,
+ std::nextafter(std::numeric_limits<double>::min(),
+ 0.0), // denorm_max
+ std::nextafter(std::numeric_limits<double>::denorm_min(), 1.0f),
+ };
+
+ for (const double d : kValues) {
+ EXPECT_EQ(d, StreamRoundTrip<double>(d));
+ EXPECT_EQ(-d, StreamRoundTrip<double>(-d));
+
+ // Avoid undefined behavior (overflow/underflow).
+ if (d <= std::numeric_limits<float>::max() &&
+ d >= std::numeric_limits<float>::lowest()) {
+ float f = static_cast<float>(d);
+ EXPECT_EQ(f, StreamRoundTrip<float>(f));
+ }
+
+ // Avoid undefined behavior (overflow/underflow).
+ if (d <= static_cast<double>(std::numeric_limits<int64_t>::max()) &&
+ d >= static_cast<double>(std::numeric_limits<int64_t>::lowest())) {
+ int64_t x = static_cast<int64_t>(d);
+ EXPECT_EQ(x, StreamRoundTrip<int64_t>(x));
+ }
+ }
+}
+
+#if !defined(__EMSCRIPTEN__)
+TEST(IOStreamStateSaver, RoundTripLongDoubles) {
+ // Technically, C++ only guarantees that long double is at least as large as a
+ // double. Practically it varies from 64-bits to 128-bits.
+ //
+ // So it is best to consider long double a best-effort extended precision
+ // type.
+
+ static_assert(
+ stream_precision_helper<long double>::kPrecision >= 36,
+ "stream_precision_helper<long double>::kPrecision should be at least 36");
+
+ using real_type = long double;
+ const real_type kValues[] = {
+ 1,
+ std::nextafter(1.0, 0.0), // 1 - epsilon
+ std::nextafter(1.0, 2.0), // 1 + epsilon
+
+ 1.0e+1,
+ 1.0e-1,
+ 1.0e+2,
+ 1.0e-2,
+ 1.0e+10,
+ 1.0e-10,
+
+ 0.00000051110000111311111111,
+ -0.00000051110000111211111111,
+
+ 1.2346789123456789123456789123456789e+6,
+ 1.2346789123456789123456789123456789e-6,
+ 1.2346789123456789123456789123456789e+30,
+ 1.2346789123456789123456789123456789e-30,
+ 1.2346789123456789123456789123456789e+38,
+ 1.2346789123456789123456789123456789e-38,
+ 1.2346789123456789123456789123456789e+308,
+ 1.2346789123456789123456789123456789e-308,
+
+ 1.0e+100,
+ 1.0e-100,
+ 1.234678912345678912345e+308,
+ 1.0234678912345678912345e-308,
+
+ // Boundary cases.
+ std::numeric_limits<real_type>::max(),
+ std::numeric_limits<real_type>::lowest(),
+ std::numeric_limits<real_type>::epsilon(),
+ std::nextafter(std::numeric_limits<real_type>::min(),
+ real_type(1)), // min + epsilon
+ std::numeric_limits<real_type>::min(), // smallest normal
+ // There are some errors dealing with denorms on apple platforms.
+ std::numeric_limits<real_type>::denorm_min(), // smallest denorm
+ std::numeric_limits<real_type>::min() / 2,
+ std::nextafter(std::numeric_limits<real_type>::min(),
+ 0.0), // denorm_max
+ std::nextafter(std::numeric_limits<real_type>::denorm_min(), 1.0f),
+ };
+
+ int index = -1;
+ for (const long double dd : kValues) {
+ index++;
+ EXPECT_EQ(dd, StreamRoundTrip<real_type>(dd)) << index;
+ EXPECT_EQ(-dd, StreamRoundTrip<real_type>(-dd)) << index;
+
+ // Avoid undefined behavior (overflow/underflow).
+ if (dd <= std::numeric_limits<double>::max() &&
+ dd >= std::numeric_limits<double>::lowest()) {
+ double d = static_cast<double>(dd);
+ EXPECT_EQ(d, StreamRoundTrip<double>(d));
+ }
+
+ // Avoid undefined behavior (overflow/underflow).
+ if (dd <= std::numeric_limits<int64_t>::max() &&
+ dd >= std::numeric_limits<int64_t>::lowest()) {
+ int64_t x = static_cast<int64_t>(dd);
+ EXPECT_EQ(x, StreamRoundTrip<int64_t>(x));
+ }
+ }
+}
+#endif // !defined(__EMSCRIPTEN__)
+
+TEST(StrToDTest, DoubleMin) {
+ const char kV[] = "2.22507385850720138e-308";
+ char* end;
+ double x = std::strtod(kV, &end);
+ EXPECT_EQ(std::numeric_limits<double>::min(), x);
+ // errno may equal ERANGE.
+}
+
+TEST(StrToDTest, DoubleDenormMin) {
+ const char kV[] = "4.94065645841246544e-324";
+ char* end;
+ double x = std::strtod(kV, &end);
+ EXPECT_EQ(std::numeric_limits<double>::denorm_min(), x);
+ // errno may equal ERANGE.
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/random/internal/mock_helpers.h b/third_party/abseil/src/absl/random/internal/mock_helpers.h
new file mode 100644
index 0000000..9af27ab
--- /dev/null
+++ b/third_party/abseil/src/absl/random/internal/mock_helpers.h
@@ -0,0 +1,127 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_RANDOM_INTERNAL_MOCK_HELPERS_H_
+#define ABSL_RANDOM_INTERNAL_MOCK_HELPERS_H_
+
+#include <tuple>
+#include <type_traits>
+
+#include "absl/base/internal/fast_type_id.h"
+#include "absl/types/optional.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace random_internal {
+
+// MockHelpers works in conjunction with MockOverloadSet, MockingBitGen, and
+// BitGenRef to enable the mocking capability for absl distribution functions.
+//
+// MockingBitGen registers mocks based on the typeid of a mock signature, KeyT,
+// which is used to generate a unique id.
+//
+// KeyT is a signature of the form:
+// result_type(discriminator_type, std::tuple<args...>)
+// The mocked function signature will be composed from KeyT as:
+// result_type(args...)
+//
+class MockHelpers {
+ using IdType = ::absl::base_internal::FastTypeIdType;
+
+ // Given a key signature type used to index the mock, extract the components.
+ // KeyT is expected to have the form:
+ // result_type(discriminator_type, arg_tuple_type)
+ template <typename KeyT>
+ struct KeySignature;
+
+ template <typename ResultT, typename DiscriminatorT, typename ArgTupleT>
+ struct KeySignature<ResultT(DiscriminatorT, ArgTupleT)> {
+ using result_type = ResultT;
+ using discriminator_type = DiscriminatorT;
+ using arg_tuple_type = ArgTupleT;
+ };
+
+ // Detector for InvokeMock.
+ template <class T>
+ using invoke_mock_t = decltype(std::declval<T*>()->InvokeMock(
+ std::declval<IdType>(), std::declval<void*>(), std::declval<void*>()));
+
+ // Empty implementation of InvokeMock.
+ template <typename KeyT, typename ReturnT, typename ArgTupleT, typename URBG,
+ typename... Args>
+ static absl::optional<ReturnT> InvokeMockImpl(char, URBG*, Args&&...) {
+ return absl::nullopt;
+ }
+
+ // Non-empty implementation of InvokeMock.
+ template <typename KeyT, typename ReturnT, typename ArgTupleT, typename URBG,
+ typename = invoke_mock_t<URBG>, typename... Args>
+ static absl::optional<ReturnT> InvokeMockImpl(int, URBG* urbg,
+ Args&&... args) {
+ ArgTupleT arg_tuple(std::forward<Args>(args)...);
+ ReturnT result;
+ if (urbg->InvokeMock(::absl::base_internal::FastTypeId<KeyT>(), &arg_tuple,
+ &result)) {
+ return result;
+ }
+ return absl::nullopt;
+ }
+
+ public:
+ // Invoke a mock for the KeyT (may or may not be a signature).
+ //
+ // KeyT is used to generate a typeid-based lookup key for the mock.
+ // KeyT is a signature of the form:
+ // result_type(discriminator_type, std::tuple<args...>)
+ // The mocked function signature will be composed from KeyT as:
+ // result_type(args...)
+ //
+ // An instance of arg_tuple_type must be constructable from Args..., since
+ // the underlying mechanism requires a pointer to an argument tuple.
+ template <typename KeyT, typename URBG, typename... Args>
+ static auto MaybeInvokeMock(URBG* urbg, Args&&... args)
+ -> absl::optional<typename KeySignature<KeyT>::result_type> {
+ // Use function overloading to dispatch to the implemenation since
+ // more modern patterns (e.g. require + constexpr) are not supported in all
+ // compiler configurations.
+ return InvokeMockImpl<KeyT, typename KeySignature<KeyT>::result_type,
+ typename KeySignature<KeyT>::arg_tuple_type, URBG>(
+ 0, urbg, std::forward<Args>(args)...);
+ }
+
+ // Acquire a mock for the KeyT (may or may not be a signature).
+ //
+ // KeyT is used to generate a typeid-based lookup for the mock.
+ // KeyT is a signature of the form:
+ // result_type(discriminator_type, std::tuple<args...>)
+ // The mocked function signature will be composed from KeyT as:
+ // result_type(args...)
+ template <typename KeyT, typename MockURBG>
+ static auto MockFor(MockURBG& m) -> decltype(
+ std::declval<MockURBG>()
+ .template RegisterMock<typename KeySignature<KeyT>::result_type,
+ typename KeySignature<KeyT>::arg_tuple_type>(
+ std::declval<IdType>())) {
+ return m.template RegisterMock<typename KeySignature<KeyT>::result_type,
+ typename KeySignature<KeyT>::arg_tuple_type>(
+ ::absl::base_internal::FastTypeId<KeyT>());
+ }
+};
+
+} // namespace random_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_RANDOM_INTERNAL_MOCK_HELPERS_H_
diff --git a/third_party/abseil/src/absl/random/internal/mock_overload_set.h b/third_party/abseil/src/absl/random/internal/mock_overload_set.h
new file mode 100644
index 0000000..dccc6ce
--- /dev/null
+++ b/third_party/abseil/src/absl/random/internal/mock_overload_set.h
@@ -0,0 +1,97 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_RANDOM_INTERNAL_MOCK_OVERLOAD_SET_H_
+#define ABSL_RANDOM_INTERNAL_MOCK_OVERLOAD_SET_H_
+
+#include <type_traits>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/random/internal/mock_helpers.h"
+#include "absl/random/mocking_bit_gen.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace random_internal {
+
+template <typename DistrT, typename Fn>
+struct MockSingleOverload;
+
+// MockSingleOverload
+//
+// MockSingleOverload hooks in to gMock's `ON_CALL` and `EXPECT_CALL` macros.
+// EXPECT_CALL(mock_single_overload, Call(...))` will expand to a call to
+// `mock_single_overload.gmock_Call(...)`. Because expectations are stored on
+// the MockingBitGen (an argument passed inside `Call(...)`), this forwards to
+// arguments to MockingBitGen::Register.
+//
+// The underlying KeyT must match the KeyT constructed by DistributionCaller.
+template <typename DistrT, typename Ret, typename... Args>
+struct MockSingleOverload<DistrT, Ret(MockingBitGen&, Args...)> {
+ static_assert(std::is_same<typename DistrT::result_type, Ret>::value,
+ "Overload signature must have return type matching the "
+ "distribution result_type.");
+ using KeyT = Ret(DistrT, std::tuple<Args...>);
+ auto gmock_Call(
+ absl::MockingBitGen& gen, // NOLINT(google-runtime-references)
+ const ::testing::Matcher<Args>&... matchers)
+ -> decltype(MockHelpers::MockFor<KeyT>(gen).gmock_Call(matchers...)) {
+ return MockHelpers::MockFor<KeyT>(gen).gmock_Call(matchers...);
+ }
+};
+
+template <typename DistrT, typename Ret, typename Arg, typename... Args>
+struct MockSingleOverload<DistrT, Ret(Arg, MockingBitGen&, Args...)> {
+ static_assert(std::is_same<typename DistrT::result_type, Ret>::value,
+ "Overload signature must have return type matching the "
+ "distribution result_type.");
+ using KeyT = Ret(DistrT, std::tuple<Arg, Args...>);
+ auto gmock_Call(
+ const ::testing::Matcher<Arg>& matcher,
+ absl::MockingBitGen& gen, // NOLINT(google-runtime-references)
+ const ::testing::Matcher<Args>&... matchers)
+ -> decltype(MockHelpers::MockFor<KeyT>(gen).gmock_Call(matcher,
+ matchers...)) {
+ return MockHelpers::MockFor<KeyT>(gen).gmock_Call(matcher, matchers...);
+ }
+};
+
+// MockOverloadSet
+//
+// MockOverloadSet takes a distribution and a collection of signatures and
+// performs overload resolution amongst all the overloads. This makes
+// `EXPECT_CALL(mock_overload_set, Call(...))` expand and do overload resolution
+// correctly.
+template <typename DistrT, typename... Signatures>
+struct MockOverloadSet;
+
+template <typename DistrT, typename Sig>
+struct MockOverloadSet<DistrT, Sig> : public MockSingleOverload<DistrT, Sig> {
+ using MockSingleOverload<DistrT, Sig>::gmock_Call;
+};
+
+template <typename DistrT, typename FirstSig, typename... Rest>
+struct MockOverloadSet<DistrT, FirstSig, Rest...>
+ : public MockSingleOverload<DistrT, FirstSig>,
+ public MockOverloadSet<DistrT, Rest...> {
+ using MockSingleOverload<DistrT, FirstSig>::gmock_Call;
+ using MockOverloadSet<DistrT, Rest...>::gmock_Call;
+};
+
+} // namespace random_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+#endif // ABSL_RANDOM_INTERNAL_MOCK_OVERLOAD_SET_H_
diff --git a/third_party/abseil/src/absl/random/internal/nanobenchmark.cc b/third_party/abseil/src/absl/random/internal/nanobenchmark.cc
new file mode 100644
index 0000000..c918181
--- /dev/null
+++ b/third_party/abseil/src/absl/random/internal/nanobenchmark.cc
@@ -0,0 +1,804 @@
+// Copyright 2017 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/random/internal/nanobenchmark.h"
+
+#include <sys/types.h>
+
+#include <algorithm> // sort
+#include <atomic>
+#include <cstddef>
+#include <cstdint>
+#include <cstdlib>
+#include <cstring> // memcpy
+#include <limits>
+#include <string>
+#include <utility>
+#include <vector>
+
+#include "absl/base/attributes.h"
+#include "absl/base/internal/raw_logging.h"
+#include "absl/random/internal/platform.h"
+#include "absl/random/internal/randen_engine.h"
+
+// OS
+#if defined(_WIN32) || defined(_WIN64)
+#define ABSL_OS_WIN
+#include <windows.h> // NOLINT
+
+#elif defined(__ANDROID__)
+#define ABSL_OS_ANDROID
+
+#elif defined(__linux__)
+#define ABSL_OS_LINUX
+#include <sched.h> // NOLINT
+#include <sys/syscall.h> // NOLINT
+#endif
+
+#if defined(ABSL_ARCH_X86_64) && !defined(ABSL_OS_WIN)
+#include <cpuid.h> // NOLINT
+#endif
+
+// __ppc_get_timebase_freq
+#if defined(ABSL_ARCH_PPC)
+#include <sys/platform/ppc.h> // NOLINT
+#endif
+
+// clock_gettime
+#if defined(ABSL_ARCH_ARM) || defined(ABSL_ARCH_AARCH64)
+#include <time.h> // NOLINT
+#endif
+
+// ABSL_RANDOM_INTERNAL_ATTRIBUTE_NEVER_INLINE prevents inlining of the method.
+#if ABSL_HAVE_ATTRIBUTE(noinline) || (defined(__GNUC__) && !defined(__clang__))
+#define ABSL_RANDOM_INTERNAL_ATTRIBUTE_NEVER_INLINE __attribute__((noinline))
+#elif defined(_MSC_VER)
+#define ABSL_RANDOM_INTERNAL_ATTRIBUTE_NEVER_INLINE __declspec(noinline)
+#else
+#define ABSL_RANDOM_INTERNAL_ATTRIBUTE_NEVER_INLINE
+#endif
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace random_internal_nanobenchmark {
+namespace {
+
+// For code folding.
+namespace platform {
+#if defined(ABSL_ARCH_X86_64)
+
+// TODO(janwas): Merge with the one in randen_hwaes.cc?
+void Cpuid(const uint32_t level, const uint32_t count,
+ uint32_t* ABSL_RANDOM_INTERNAL_RESTRICT abcd) {
+#if defined(ABSL_OS_WIN)
+ int regs[4];
+ __cpuidex(regs, level, count);
+ for (int i = 0; i < 4; ++i) {
+ abcd[i] = regs[i];
+ }
+#else
+ uint32_t a, b, c, d;
+ __cpuid_count(level, count, a, b, c, d);
+ abcd[0] = a;
+ abcd[1] = b;
+ abcd[2] = c;
+ abcd[3] = d;
+#endif
+}
+
+std::string BrandString() {
+ char brand_string[49];
+ uint32_t abcd[4];
+
+ // Check if brand string is supported (it is on all reasonable Intel/AMD)
+ Cpuid(0x80000000U, 0, abcd);
+ if (abcd[0] < 0x80000004U) {
+ return std::string();
+ }
+
+ for (int i = 0; i < 3; ++i) {
+ Cpuid(0x80000002U + i, 0, abcd);
+ memcpy(brand_string + i * 16, &abcd, sizeof(abcd));
+ }
+ brand_string[48] = 0;
+ return brand_string;
+}
+
+// Returns the frequency quoted inside the brand string. This does not
+// account for throttling nor Turbo Boost.
+double NominalClockRate() {
+ const std::string& brand_string = BrandString();
+ // Brand strings include the maximum configured frequency. These prefixes are
+ // defined by Intel CPUID documentation.
+ const char* prefixes[3] = {"MHz", "GHz", "THz"};
+ const double multipliers[3] = {1E6, 1E9, 1E12};
+ for (size_t i = 0; i < 3; ++i) {
+ const size_t pos_prefix = brand_string.find(prefixes[i]);
+ if (pos_prefix != std::string::npos) {
+ const size_t pos_space = brand_string.rfind(' ', pos_prefix - 1);
+ if (pos_space != std::string::npos) {
+ const std::string digits =
+ brand_string.substr(pos_space + 1, pos_prefix - pos_space - 1);
+ return std::stod(digits) * multipliers[i];
+ }
+ }
+ }
+
+ return 0.0;
+}
+
+#endif // ABSL_ARCH_X86_64
+} // namespace platform
+
+// Prevents the compiler from eliding the computations that led to "output".
+template <class T>
+inline void PreventElision(T&& output) {
+#ifndef ABSL_OS_WIN
+ // Works by indicating to the compiler that "output" is being read and
+ // modified. The +r constraint avoids unnecessary writes to memory, but only
+ // works for built-in types (typically FuncOutput).
+ asm volatile("" : "+r"(output) : : "memory");
+#else
+ // MSVC does not support inline assembly anymore (and never supported GCC's
+ // RTL constraints). Self-assignment with #pragma optimize("off") might be
+ // expected to prevent elision, but it does not with MSVC 2015. Type-punning
+ // with volatile pointers generates inefficient code on MSVC 2017.
+ static std::atomic<T> dummy(T{});
+ dummy.store(output, std::memory_order_relaxed);
+#endif
+}
+
+namespace timer {
+
+// Start/Stop return absolute timestamps and must be placed immediately before
+// and after the region to measure. We provide separate Start/Stop functions
+// because they use different fences.
+//
+// Background: RDTSC is not 'serializing'; earlier instructions may complete
+// after it, and/or later instructions may complete before it. 'Fences' ensure
+// regions' elapsed times are independent of such reordering. The only
+// documented unprivileged serializing instruction is CPUID, which acts as a
+// full fence (no reordering across it in either direction). Unfortunately
+// the latency of CPUID varies wildly (perhaps made worse by not initializing
+// its EAX input). Because it cannot reliably be deducted from the region's
+// elapsed time, it must not be included in the region to measure (i.e.
+// between the two RDTSC).
+//
+// The newer RDTSCP is sometimes described as serializing, but it actually
+// only serves as a half-fence with release semantics. Although all
+// instructions in the region will complete before the final timestamp is
+// captured, subsequent instructions may leak into the region and increase the
+// elapsed time. Inserting another fence after the final RDTSCP would prevent
+// such reordering without affecting the measured region.
+//
+// Fortunately, such a fence exists. The LFENCE instruction is only documented
+// to delay later loads until earlier loads are visible. However, Intel's
+// reference manual says it acts as a full fence (waiting until all earlier
+// instructions have completed, and delaying later instructions until it
+// completes). AMD assigns the same behavior to MFENCE.
+//
+// We need a fence before the initial RDTSC to prevent earlier instructions
+// from leaking into the region, and arguably another after RDTSC to avoid
+// region instructions from completing before the timestamp is recorded.
+// When surrounded by fences, the additional RDTSCP half-fence provides no
+// benefit, so the initial timestamp can be recorded via RDTSC, which has
+// lower overhead than RDTSCP because it does not read TSC_AUX. In summary,
+// we define Start = LFENCE/RDTSC/LFENCE; Stop = RDTSCP/LFENCE.
+//
+// Using Start+Start leads to higher variance and overhead than Stop+Stop.
+// However, Stop+Stop includes an LFENCE in the region measurements, which
+// adds a delay dependent on earlier loads. The combination of Start+Stop
+// is faster than Start+Start and more consistent than Stop+Stop because
+// the first LFENCE already delayed subsequent loads before the measured
+// region. This combination seems not to have been considered in prior work:
+// http://akaros.cs.berkeley.edu/lxr/akaros/kern/arch/x86/rdtsc_test.c
+//
+// Note: performance counters can measure 'exact' instructions-retired or
+// (unhalted) cycle counts. The RDPMC instruction is not serializing and also
+// requires fences. Unfortunately, it is not accessible on all OSes and we
+// prefer to avoid kernel-mode drivers. Performance counters are also affected
+// by several under/over-count errata, so we use the TSC instead.
+
+// Returns a 64-bit timestamp in unit of 'ticks'; to convert to seconds,
+// divide by InvariantTicksPerSecond.
+inline uint64_t Start64() {
+ uint64_t t;
+#if defined(ABSL_ARCH_PPC)
+ asm volatile("mfspr %0, %1" : "=r"(t) : "i"(268));
+#elif defined(ABSL_ARCH_X86_64)
+#if defined(ABSL_OS_WIN)
+ _ReadWriteBarrier();
+ _mm_lfence();
+ _ReadWriteBarrier();
+ t = __rdtsc();
+ _ReadWriteBarrier();
+ _mm_lfence();
+ _ReadWriteBarrier();
+#else
+ asm volatile(
+ "lfence\n\t"
+ "rdtsc\n\t"
+ "shl $32, %%rdx\n\t"
+ "or %%rdx, %0\n\t"
+ "lfence"
+ : "=a"(t)
+ :
+ // "memory" avoids reordering. rdx = TSC >> 32.
+ // "cc" = flags modified by SHL.
+ : "rdx", "memory", "cc");
+#endif
+#else
+ // Fall back to OS - unsure how to reliably query cntvct_el0 frequency.
+ timespec ts;
+ clock_gettime(CLOCK_REALTIME, &ts);
+ t = ts.tv_sec * 1000000000LL + ts.tv_nsec;
+#endif
+ return t;
+}
+
+inline uint64_t Stop64() {
+ uint64_t t;
+#if defined(ABSL_ARCH_X86_64)
+#if defined(ABSL_OS_WIN)
+ _ReadWriteBarrier();
+ unsigned aux;
+ t = __rdtscp(&aux);
+ _ReadWriteBarrier();
+ _mm_lfence();
+ _ReadWriteBarrier();
+#else
+ // Use inline asm because __rdtscp generates code to store TSC_AUX (ecx).
+ asm volatile(
+ "rdtscp\n\t"
+ "shl $32, %%rdx\n\t"
+ "or %%rdx, %0\n\t"
+ "lfence"
+ : "=a"(t)
+ :
+ // "memory" avoids reordering. rcx = TSC_AUX. rdx = TSC >> 32.
+ // "cc" = flags modified by SHL.
+ : "rcx", "rdx", "memory", "cc");
+#endif
+#else
+ t = Start64();
+#endif
+ return t;
+}
+
+// Returns a 32-bit timestamp with about 4 cycles less overhead than
+// Start64. Only suitable for measuring very short regions because the
+// timestamp overflows about once a second.
+inline uint32_t Start32() {
+ uint32_t t;
+#if defined(ABSL_ARCH_X86_64)
+#if defined(ABSL_OS_WIN)
+ _ReadWriteBarrier();
+ _mm_lfence();
+ _ReadWriteBarrier();
+ t = static_cast<uint32_t>(__rdtsc());
+ _ReadWriteBarrier();
+ _mm_lfence();
+ _ReadWriteBarrier();
+#else
+ asm volatile(
+ "lfence\n\t"
+ "rdtsc\n\t"
+ "lfence"
+ : "=a"(t)
+ :
+ // "memory" avoids reordering. rdx = TSC >> 32.
+ : "rdx", "memory");
+#endif
+#else
+ t = static_cast<uint32_t>(Start64());
+#endif
+ return t;
+}
+
+inline uint32_t Stop32() {
+ uint32_t t;
+#if defined(ABSL_ARCH_X86_64)
+#if defined(ABSL_OS_WIN)
+ _ReadWriteBarrier();
+ unsigned aux;
+ t = static_cast<uint32_t>(__rdtscp(&aux));
+ _ReadWriteBarrier();
+ _mm_lfence();
+ _ReadWriteBarrier();
+#else
+ // Use inline asm because __rdtscp generates code to store TSC_AUX (ecx).
+ asm volatile(
+ "rdtscp\n\t"
+ "lfence"
+ : "=a"(t)
+ :
+ // "memory" avoids reordering. rcx = TSC_AUX. rdx = TSC >> 32.
+ : "rcx", "rdx", "memory");
+#endif
+#else
+ t = static_cast<uint32_t>(Stop64());
+#endif
+ return t;
+}
+
+} // namespace timer
+
+namespace robust_statistics {
+
+// Sorts integral values in ascending order (e.g. for Mode). About 3x faster
+// than std::sort for input distributions with very few unique values.
+template <class T>
+void CountingSort(T* values, size_t num_values) {
+ // Unique values and their frequency (similar to flat_map).
+ using Unique = std::pair<T, int>;
+ std::vector<Unique> unique;
+ for (size_t i = 0; i < num_values; ++i) {
+ const T value = values[i];
+ const auto pos =
+ std::find_if(unique.begin(), unique.end(),
+ [value](const Unique u) { return u.first == value; });
+ if (pos == unique.end()) {
+ unique.push_back(std::make_pair(value, 1));
+ } else {
+ ++pos->second;
+ }
+ }
+
+ // Sort in ascending order of value (pair.first).
+ std::sort(unique.begin(), unique.end());
+
+ // Write that many copies of each unique value to the array.
+ T* ABSL_RANDOM_INTERNAL_RESTRICT p = values;
+ for (const auto& value_count : unique) {
+ std::fill(p, p + value_count.second, value_count.first);
+ p += value_count.second;
+ }
+ ABSL_RAW_CHECK(p == values + num_values, "Did not produce enough output");
+}
+
+// @return i in [idx_begin, idx_begin + half_count) that minimizes
+// sorted[i + half_count] - sorted[i].
+template <typename T>
+size_t MinRange(const T* const ABSL_RANDOM_INTERNAL_RESTRICT sorted,
+ const size_t idx_begin, const size_t half_count) {
+ T min_range = (std::numeric_limits<T>::max)();
+ size_t min_idx = 0;
+
+ for (size_t idx = idx_begin; idx < idx_begin + half_count; ++idx) {
+ ABSL_RAW_CHECK(sorted[idx] <= sorted[idx + half_count], "Not sorted");
+ const T range = sorted[idx + half_count] - sorted[idx];
+ if (range < min_range) {
+ min_range = range;
+ min_idx = idx;
+ }
+ }
+
+ return min_idx;
+}
+
+// Returns an estimate of the mode by calling MinRange on successively
+// halved intervals. "sorted" must be in ascending order. This is the
+// Half Sample Mode estimator proposed by Bickel in "On a fast, robust
+// estimator of the mode", with complexity O(N log N). The mode is less
+// affected by outliers in highly-skewed distributions than the median.
+// The averaging operation below assumes "T" is an unsigned integer type.
+template <typename T>
+T ModeOfSorted(const T* const ABSL_RANDOM_INTERNAL_RESTRICT sorted,
+ const size_t num_values) {
+ size_t idx_begin = 0;
+ size_t half_count = num_values / 2;
+ while (half_count > 1) {
+ idx_begin = MinRange(sorted, idx_begin, half_count);
+ half_count >>= 1;
+ }
+
+ const T x = sorted[idx_begin + 0];
+ if (half_count == 0) {
+ return x;
+ }
+ ABSL_RAW_CHECK(half_count == 1, "Should stop at half_count=1");
+ const T average = (x + sorted[idx_begin + 1] + 1) / 2;
+ return average;
+}
+
+// Returns the mode. Side effect: sorts "values".
+template <typename T>
+T Mode(T* values, const size_t num_values) {
+ CountingSort(values, num_values);
+ return ModeOfSorted(values, num_values);
+}
+
+template <typename T, size_t N>
+T Mode(T (&values)[N]) {
+ return Mode(&values[0], N);
+}
+
+// Returns the median value. Side effect: sorts "values".
+template <typename T>
+T Median(T* values, const size_t num_values) {
+ ABSL_RAW_CHECK(num_values != 0, "Empty input");
+ std::sort(values, values + num_values);
+ const size_t half = num_values / 2;
+ // Odd count: return middle
+ if (num_values % 2) {
+ return values[half];
+ }
+ // Even count: return average of middle two.
+ return (values[half] + values[half - 1] + 1) / 2;
+}
+
+// Returns a robust measure of variability.
+template <typename T>
+T MedianAbsoluteDeviation(const T* values, const size_t num_values,
+ const T median) {
+ ABSL_RAW_CHECK(num_values != 0, "Empty input");
+ std::vector<T> abs_deviations;
+ abs_deviations.reserve(num_values);
+ for (size_t i = 0; i < num_values; ++i) {
+ const int64_t abs = std::abs(int64_t(values[i]) - int64_t(median));
+ abs_deviations.push_back(static_cast<T>(abs));
+ }
+ return Median(abs_deviations.data(), num_values);
+}
+
+} // namespace robust_statistics
+
+// Ticks := platform-specific timer values (CPU cycles on x86). Must be
+// unsigned to guarantee wraparound on overflow. 32 bit timers are faster to
+// read than 64 bit.
+using Ticks = uint32_t;
+
+// Returns timer overhead / minimum measurable difference.
+Ticks TimerResolution() {
+ // Nested loop avoids exceeding stack/L1 capacity.
+ Ticks repetitions[Params::kTimerSamples];
+ for (size_t rep = 0; rep < Params::kTimerSamples; ++rep) {
+ Ticks samples[Params::kTimerSamples];
+ for (size_t i = 0; i < Params::kTimerSamples; ++i) {
+ const Ticks t0 = timer::Start32();
+ const Ticks t1 = timer::Stop32();
+ samples[i] = t1 - t0;
+ }
+ repetitions[rep] = robust_statistics::Mode(samples);
+ }
+ return robust_statistics::Mode(repetitions);
+}
+
+static const Ticks timer_resolution = TimerResolution();
+
+// Estimates the expected value of "lambda" values with a variable number of
+// samples until the variability "rel_mad" is less than "max_rel_mad".
+template <class Lambda>
+Ticks SampleUntilStable(const double max_rel_mad, double* rel_mad,
+ const Params& p, const Lambda& lambda) {
+ auto measure_duration = [&lambda]() -> Ticks {
+ const Ticks t0 = timer::Start32();
+ lambda();
+ const Ticks t1 = timer::Stop32();
+ return t1 - t0;
+ };
+
+ // Choose initial samples_per_eval based on a single estimated duration.
+ Ticks est = measure_duration();
+ static const double ticks_per_second = InvariantTicksPerSecond();
+ const size_t ticks_per_eval = ticks_per_second * p.seconds_per_eval;
+ size_t samples_per_eval = ticks_per_eval / est;
+ samples_per_eval = (std::max)(samples_per_eval, p.min_samples_per_eval);
+
+ std::vector<Ticks> samples;
+ samples.reserve(1 + samples_per_eval);
+ samples.push_back(est);
+
+ // Percentage is too strict for tiny differences, so also allow a small
+ // absolute "median absolute deviation".
+ const Ticks max_abs_mad = (timer_resolution + 99) / 100;
+ *rel_mad = 0.0; // ensure initialized
+
+ for (size_t eval = 0; eval < p.max_evals; ++eval, samples_per_eval *= 2) {
+ samples.reserve(samples.size() + samples_per_eval);
+ for (size_t i = 0; i < samples_per_eval; ++i) {
+ const Ticks r = measure_duration();
+ samples.push_back(r);
+ }
+
+ if (samples.size() >= p.min_mode_samples) {
+ est = robust_statistics::Mode(samples.data(), samples.size());
+ } else {
+ // For "few" (depends also on the variance) samples, Median is safer.
+ est = robust_statistics::Median(samples.data(), samples.size());
+ }
+ ABSL_RAW_CHECK(est != 0, "Estimator returned zero duration");
+
+ // Median absolute deviation (mad) is a robust measure of 'variability'.
+ const Ticks abs_mad = robust_statistics::MedianAbsoluteDeviation(
+ samples.data(), samples.size(), est);
+ *rel_mad = static_cast<double>(static_cast<int>(abs_mad)) / est;
+
+ if (*rel_mad <= max_rel_mad || abs_mad <= max_abs_mad) {
+ if (p.verbose) {
+ ABSL_RAW_LOG(INFO,
+ "%6zu samples => %5u (abs_mad=%4u, rel_mad=%4.2f%%)\n",
+ samples.size(), est, abs_mad, *rel_mad * 100.0);
+ }
+ return est;
+ }
+ }
+
+ if (p.verbose) {
+ ABSL_RAW_LOG(WARNING,
+ "rel_mad=%4.2f%% still exceeds %4.2f%% after %6zu samples.\n",
+ *rel_mad * 100.0, max_rel_mad * 100.0, samples.size());
+ }
+ return est;
+}
+
+using InputVec = std::vector<FuncInput>;
+
+// Returns vector of unique input values.
+InputVec UniqueInputs(const FuncInput* inputs, const size_t num_inputs) {
+ InputVec unique(inputs, inputs + num_inputs);
+ std::sort(unique.begin(), unique.end());
+ unique.erase(std::unique(unique.begin(), unique.end()), unique.end());
+ return unique;
+}
+
+// Returns how often we need to call func for sufficient precision, or zero
+// on failure (e.g. the elapsed time is too long for a 32-bit tick count).
+size_t NumSkip(const Func func, const void* arg, const InputVec& unique,
+ const Params& p) {
+ // Min elapsed ticks for any input.
+ Ticks min_duration = ~0u;
+
+ for (const FuncInput input : unique) {
+ // Make sure a 32-bit timer is sufficient.
+ const uint64_t t0 = timer::Start64();
+ PreventElision(func(arg, input));
+ const uint64_t t1 = timer::Stop64();
+ const uint64_t elapsed = t1 - t0;
+ if (elapsed >= (1ULL << 30)) {
+ ABSL_RAW_LOG(WARNING,
+ "Measurement failed: need 64-bit timer for input=%zu\n",
+ static_cast<size_t>(input));
+ return 0;
+ }
+
+ double rel_mad;
+ const Ticks total = SampleUntilStable(
+ p.target_rel_mad, &rel_mad, p,
+ [func, arg, input]() { PreventElision(func(arg, input)); });
+ min_duration = (std::min)(min_duration, total - timer_resolution);
+ }
+
+ // Number of repetitions required to reach the target resolution.
+ const size_t max_skip = p.precision_divisor;
+ // Number of repetitions given the estimated duration.
+ const size_t num_skip =
+ min_duration == 0 ? 0 : (max_skip + min_duration - 1) / min_duration;
+ if (p.verbose) {
+ ABSL_RAW_LOG(INFO, "res=%u max_skip=%zu min_dur=%u num_skip=%zu\n",
+ timer_resolution, max_skip, min_duration, num_skip);
+ }
+ return num_skip;
+}
+
+// Replicates inputs until we can omit "num_skip" occurrences of an input.
+InputVec ReplicateInputs(const FuncInput* inputs, const size_t num_inputs,
+ const size_t num_unique, const size_t num_skip,
+ const Params& p) {
+ InputVec full;
+ if (num_unique == 1) {
+ full.assign(p.subset_ratio * num_skip, inputs[0]);
+ return full;
+ }
+
+ full.reserve(p.subset_ratio * num_skip * num_inputs);
+ for (size_t i = 0; i < p.subset_ratio * num_skip; ++i) {
+ full.insert(full.end(), inputs, inputs + num_inputs);
+ }
+ absl::random_internal::randen_engine<uint32_t> rng;
+ std::shuffle(full.begin(), full.end(), rng);
+ return full;
+}
+
+// Copies the "full" to "subset" in the same order, but with "num_skip"
+// randomly selected occurrences of "input_to_skip" removed.
+void FillSubset(const InputVec& full, const FuncInput input_to_skip,
+ const size_t num_skip, InputVec* subset) {
+ const size_t count = std::count(full.begin(), full.end(), input_to_skip);
+ // Generate num_skip random indices: which occurrence to skip.
+ std::vector<uint32_t> omit;
+ // Replacement for std::iota, not yet available in MSVC builds.
+ omit.reserve(count);
+ for (size_t i = 0; i < count; ++i) {
+ omit.push_back(i);
+ }
+ // omit[] is the same on every call, but that's OK because they identify the
+ // Nth instance of input_to_skip, so the position within full[] differs.
+ absl::random_internal::randen_engine<uint32_t> rng;
+ std::shuffle(omit.begin(), omit.end(), rng);
+ omit.resize(num_skip);
+ std::sort(omit.begin(), omit.end());
+
+ uint32_t occurrence = ~0u; // 0 after preincrement
+ size_t idx_omit = 0; // cursor within omit[]
+ size_t idx_subset = 0; // cursor within *subset
+ for (const FuncInput next : full) {
+ if (next == input_to_skip) {
+ ++occurrence;
+ // Haven't removed enough already
+ if (idx_omit < num_skip) {
+ // This one is up for removal
+ if (occurrence == omit[idx_omit]) {
+ ++idx_omit;
+ continue;
+ }
+ }
+ }
+ if (idx_subset < subset->size()) {
+ (*subset)[idx_subset++] = next;
+ }
+ }
+ ABSL_RAW_CHECK(idx_subset == subset->size(), "idx_subset not at end");
+ ABSL_RAW_CHECK(idx_omit == omit.size(), "idx_omit not at end");
+ ABSL_RAW_CHECK(occurrence == count - 1, "occurrence not at end");
+}
+
+// Returns total ticks elapsed for all inputs.
+Ticks TotalDuration(const Func func, const void* arg, const InputVec* inputs,
+ const Params& p, double* max_rel_mad) {
+ double rel_mad;
+ const Ticks duration =
+ SampleUntilStable(p.target_rel_mad, &rel_mad, p, [func, arg, inputs]() {
+ for (const FuncInput input : *inputs) {
+ PreventElision(func(arg, input));
+ }
+ });
+ *max_rel_mad = (std::max)(*max_rel_mad, rel_mad);
+ return duration;
+}
+
+// (Nearly) empty Func for measuring timer overhead/resolution.
+ABSL_RANDOM_INTERNAL_ATTRIBUTE_NEVER_INLINE FuncOutput
+EmptyFunc(const void* arg, const FuncInput input) {
+ return input;
+}
+
+// Returns overhead of accessing inputs[] and calling a function; this will
+// be deducted from future TotalDuration return values.
+Ticks Overhead(const void* arg, const InputVec* inputs, const Params& p) {
+ double rel_mad;
+ // Zero tolerance because repeatability is crucial and EmptyFunc is fast.
+ return SampleUntilStable(0.0, &rel_mad, p, [arg, inputs]() {
+ for (const FuncInput input : *inputs) {
+ PreventElision(EmptyFunc(arg, input));
+ }
+ });
+}
+
+} // namespace
+
+void PinThreadToCPU(int cpu) {
+ // We might migrate to another CPU before pinning below, but at least cpu
+ // will be one of the CPUs on which this thread ran.
+#if defined(ABSL_OS_WIN)
+ if (cpu < 0) {
+ cpu = static_cast<int>(GetCurrentProcessorNumber());
+ ABSL_RAW_CHECK(cpu >= 0, "PinThreadToCPU detect failed");
+ if (cpu >= 64) {
+ // NOTE: On wine, at least, GetCurrentProcessorNumber() sometimes returns
+ // a value > 64, which is out of range. When this happens, log a message
+ // and don't set a cpu affinity.
+ ABSL_RAW_LOG(ERROR, "Invalid CPU number: %d", cpu);
+ return;
+ }
+ } else if (cpu >= 64) {
+ // User specified an explicit CPU affinity > the valid range.
+ ABSL_RAW_LOG(FATAL, "Invalid CPU number: %d", cpu);
+ }
+ const DWORD_PTR prev = SetThreadAffinityMask(GetCurrentThread(), 1ULL << cpu);
+ ABSL_RAW_CHECK(prev != 0, "SetAffinity failed");
+#elif defined(ABSL_OS_LINUX) && !defined(ABSL_OS_ANDROID)
+ if (cpu < 0) {
+ cpu = sched_getcpu();
+ ABSL_RAW_CHECK(cpu >= 0, "PinThreadToCPU detect failed");
+ }
+ const pid_t pid = 0; // current thread
+ cpu_set_t set;
+ CPU_ZERO(&set);
+ CPU_SET(cpu, &set);
+ const int err = sched_setaffinity(pid, sizeof(set), &set);
+ ABSL_RAW_CHECK(err == 0, "SetAffinity failed");
+#endif
+}
+
+// Returns tick rate. Invariant means the tick counter frequency is independent
+// of CPU throttling or sleep. May be expensive, caller should cache the result.
+double InvariantTicksPerSecond() {
+#if defined(ABSL_ARCH_PPC)
+ return __ppc_get_timebase_freq();
+#elif defined(ABSL_ARCH_X86_64)
+ // We assume the TSC is invariant; it is on all recent Intel/AMD CPUs.
+ return platform::NominalClockRate();
+#else
+ // Fall back to clock_gettime nanoseconds.
+ return 1E9;
+#endif
+}
+
+size_t MeasureImpl(const Func func, const void* arg, const size_t num_skip,
+ const InputVec& unique, const InputVec& full,
+ const Params& p, Result* results) {
+ const float mul = 1.0f / static_cast<int>(num_skip);
+
+ InputVec subset(full.size() - num_skip);
+ const Ticks overhead = Overhead(arg, &full, p);
+ const Ticks overhead_skip = Overhead(arg, &subset, p);
+ if (overhead < overhead_skip) {
+ ABSL_RAW_LOG(WARNING, "Measurement failed: overhead %u < %u\n", overhead,
+ overhead_skip);
+ return 0;
+ }
+
+ if (p.verbose) {
+ ABSL_RAW_LOG(INFO, "#inputs=%5zu,%5zu overhead=%5u,%5u\n", full.size(),
+ subset.size(), overhead, overhead_skip);
+ }
+
+ double max_rel_mad = 0.0;
+ const Ticks total = TotalDuration(func, arg, &full, p, &max_rel_mad);
+
+ for (size_t i = 0; i < unique.size(); ++i) {
+ FillSubset(full, unique[i], num_skip, &subset);
+ const Ticks total_skip = TotalDuration(func, arg, &subset, p, &max_rel_mad);
+
+ if (total < total_skip) {
+ ABSL_RAW_LOG(WARNING, "Measurement failed: total %u < %u\n", total,
+ total_skip);
+ return 0;
+ }
+
+ const Ticks duration = (total - overhead) - (total_skip - overhead_skip);
+ results[i].input = unique[i];
+ results[i].ticks = duration * mul;
+ results[i].variability = max_rel_mad;
+ }
+
+ return unique.size();
+}
+
+size_t Measure(const Func func, const void* arg, const FuncInput* inputs,
+ const size_t num_inputs, Result* results, const Params& p) {
+ ABSL_RAW_CHECK(num_inputs != 0, "No inputs");
+
+ const InputVec unique = UniqueInputs(inputs, num_inputs);
+ const size_t num_skip = NumSkip(func, arg, unique, p); // never 0
+ if (num_skip == 0) return 0; // NumSkip already printed error message
+
+ const InputVec full =
+ ReplicateInputs(inputs, num_inputs, unique.size(), num_skip, p);
+
+ // MeasureImpl may fail up to p.max_measure_retries times.
+ for (size_t i = 0; i < p.max_measure_retries; i++) {
+ auto result = MeasureImpl(func, arg, num_skip, unique, full, p, results);
+ if (result != 0) {
+ return result;
+ }
+ }
+ // All retries failed. (Unusual)
+ return 0;
+}
+
+} // namespace random_internal_nanobenchmark
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/random/internal/nanobenchmark.h b/third_party/abseil/src/absl/random/internal/nanobenchmark.h
new file mode 100644
index 0000000..a5097ba
--- /dev/null
+++ b/third_party/abseil/src/absl/random/internal/nanobenchmark.h
@@ -0,0 +1,172 @@
+// Copyright 2017 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_RANDOM_INTERNAL_NANOBENCHMARK_H_
+#define ABSL_RANDOM_INTERNAL_NANOBENCHMARK_H_
+
+// Benchmarks functions of a single integer argument with realistic branch
+// prediction hit rates. Uses a robust estimator to summarize the measurements.
+// The precision is about 0.2%.
+//
+// Examples: see nanobenchmark_test.cc.
+//
+// Background: Microbenchmarks such as http://github.com/google/benchmark
+// can measure elapsed times on the order of a microsecond. Shorter functions
+// are typically measured by repeating them thousands of times and dividing
+// the total elapsed time by this count. Unfortunately, repetition (especially
+// with the same input parameter!) influences the runtime. In time-critical
+// code, it is reasonable to expect warm instruction/data caches and TLBs,
+// but a perfect record of which branches will be taken is unrealistic.
+// Unless the application also repeatedly invokes the measured function with
+// the same parameter, the benchmark is measuring something very different -
+// a best-case result, almost as if the parameter were made a compile-time
+// constant. This may lead to erroneous conclusions about branch-heavy
+// algorithms outperforming branch-free alternatives.
+//
+// Our approach differs in three ways. Adding fences to the timer functions
+// reduces variability due to instruction reordering, improving the timer
+// resolution to about 40 CPU cycles. However, shorter functions must still
+// be invoked repeatedly. For more realistic branch prediction performance,
+// we vary the input parameter according to a user-specified distribution.
+// Thus, instead of VaryInputs(Measure(Repeat(func))), we change the
+// loop nesting to Measure(Repeat(VaryInputs(func))). We also estimate the
+// central tendency of the measurement samples with the "half sample mode",
+// which is more robust to outliers and skewed data than the mean or median.
+
+// NOTE: for compatibility with multiple translation units compiled with
+// distinct flags, avoid #including headers that define functions.
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include "absl/base/config.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace random_internal_nanobenchmark {
+
+// Input influencing the function being measured (e.g. number of bytes to copy).
+using FuncInput = size_t;
+
+// "Proof of work" returned by Func to ensure the compiler does not elide it.
+using FuncOutput = uint64_t;
+
+// Function to measure: either 1) a captureless lambda or function with two
+// arguments or 2) a lambda with capture, in which case the first argument
+// is reserved for use by MeasureClosure.
+using Func = FuncOutput (*)(const void*, FuncInput);
+
+// Internal parameters that determine precision/resolution/measuring time.
+struct Params {
+ // For measuring timer overhead/resolution. Used in a nested loop =>
+ // quadratic time, acceptable because we know timer overhead is "low".
+ // constexpr because this is used to define array bounds.
+ static constexpr size_t kTimerSamples = 256;
+
+ // Best-case precision, expressed as a divisor of the timer resolution.
+ // Larger => more calls to Func and higher precision.
+ size_t precision_divisor = 1024;
+
+ // Ratio between full and subset input distribution sizes. Cannot be less
+ // than 2; larger values increase measurement time but more faithfully
+ // model the given input distribution.
+ size_t subset_ratio = 2;
+
+ // Together with the estimated Func duration, determines how many times to
+ // call Func before checking the sample variability. Larger values increase
+ // measurement time, memory/cache use and precision.
+ double seconds_per_eval = 4E-3;
+
+ // The minimum number of samples before estimating the central tendency.
+ size_t min_samples_per_eval = 7;
+
+ // The mode is better than median for estimating the central tendency of
+ // skewed/fat-tailed distributions, but it requires sufficient samples
+ // relative to the width of half-ranges.
+ size_t min_mode_samples = 64;
+
+ // Maximum permissible variability (= median absolute deviation / center).
+ double target_rel_mad = 0.002;
+
+ // Abort after this many evals without reaching target_rel_mad. This
+ // prevents infinite loops.
+ size_t max_evals = 9;
+
+ // Retry the measure loop up to this many times.
+ size_t max_measure_retries = 2;
+
+ // Whether to print additional statistics to stdout.
+ bool verbose = true;
+};
+
+// Measurement result for each unique input.
+struct Result {
+ FuncInput input;
+
+ // Robust estimate (mode or median) of duration.
+ float ticks;
+
+ // Measure of variability (median absolute deviation relative to "ticks").
+ float variability;
+};
+
+// Ensures the thread is running on the specified cpu, and no others.
+// Reduces noise due to desynchronized socket RDTSC and context switches.
+// If "cpu" is negative, pin to the currently running core.
+void PinThreadToCPU(const int cpu = -1);
+
+// Returns tick rate, useful for converting measurements to seconds. Invariant
+// means the tick counter frequency is independent of CPU throttling or sleep.
+// This call may be expensive, callers should cache the result.
+double InvariantTicksPerSecond();
+
+// Precisely measures the number of ticks elapsed when calling "func" with the
+// given inputs, shuffled to ensure realistic branch prediction hit rates.
+//
+// "func" returns a 'proof of work' to ensure its computations are not elided.
+// "arg" is passed to Func, or reserved for internal use by MeasureClosure.
+// "inputs" is an array of "num_inputs" (not necessarily unique) arguments to
+// "func". The values should be chosen to maximize coverage of "func". This
+// represents a distribution, so a value's frequency should reflect its
+// probability in the real application. Order does not matter; for example, a
+// uniform distribution over [0, 4) could be represented as {3,0,2,1}.
+// Returns how many Result were written to "results": one per unique input, or
+// zero if the measurement failed (an error message goes to stderr).
+size_t Measure(const Func func, const void* arg, const FuncInput* inputs,
+ const size_t num_inputs, Result* results,
+ const Params& p = Params());
+
+// Calls operator() of the given closure (lambda function).
+template <class Closure>
+static FuncOutput CallClosure(const void* f, const FuncInput input) {
+ return (*reinterpret_cast<const Closure*>(f))(input);
+}
+
+// Same as Measure, except "closure" is typically a lambda function of
+// FuncInput -> FuncOutput with a capture list.
+template <class Closure>
+static inline size_t MeasureClosure(const Closure& closure,
+ const FuncInput* inputs,
+ const size_t num_inputs, Result* results,
+ const Params& p = Params()) {
+ return Measure(reinterpret_cast<Func>(&CallClosure<Closure>),
+ reinterpret_cast<const void*>(&closure), inputs, num_inputs,
+ results, p);
+}
+
+} // namespace random_internal_nanobenchmark
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_RANDOM_INTERNAL_NANOBENCHMARK_H_
diff --git a/third_party/abseil/src/absl/random/internal/nanobenchmark_test.cc b/third_party/abseil/src/absl/random/internal/nanobenchmark_test.cc
new file mode 100644
index 0000000..f1571e2
--- /dev/null
+++ b/third_party/abseil/src/absl/random/internal/nanobenchmark_test.cc
@@ -0,0 +1,77 @@
+// Copyright 2017 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/random/internal/nanobenchmark.h"
+
+#include "absl/base/internal/raw_logging.h"
+#include "absl/strings/numbers.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace random_internal_nanobenchmark {
+namespace {
+
+uint64_t Div(const void*, FuncInput in) {
+ // Here we're measuring the throughput because benchmark invocations are
+ // independent.
+ const int64_t d1 = 0xFFFFFFFFFFll / int64_t(in); // IDIV
+ return d1;
+}
+
+template <size_t N>
+void MeasureDiv(const FuncInput (&inputs)[N]) {
+ Result results[N];
+ Params params;
+ params.max_evals = 6; // avoid test timeout
+ const size_t num_results = Measure(&Div, nullptr, inputs, N, results, params);
+ if (num_results == 0) {
+ ABSL_RAW_LOG(
+ WARNING,
+ "WARNING: Measurement failed, should not happen when using "
+ "PinThreadToCPU unless the region to measure takes > 1 second.\n");
+ return;
+ }
+ for (size_t i = 0; i < num_results; ++i) {
+ ABSL_RAW_LOG(INFO, "%5zu: %6.2f ticks; MAD=%4.2f%%\n", results[i].input,
+ results[i].ticks, results[i].variability * 100.0);
+ ABSL_RAW_CHECK(results[i].ticks != 0.0f, "Zero duration");
+ }
+}
+
+void RunAll(const int argc, char* argv[]) {
+ // Avoid migrating between cores - important on multi-socket systems.
+ int cpu = -1;
+ if (argc == 2) {
+ if (!absl::SimpleAtoi(argv[1], &cpu)) {
+ ABSL_RAW_LOG(FATAL, "The optional argument must be a CPU number >= 0.\n");
+ }
+ }
+ PinThreadToCPU(cpu);
+
+ // unpredictable == 1 but the compiler doesn't know that.
+ const FuncInput unpredictable = argc != 999;
+ static const FuncInput inputs[] = {unpredictable * 10, unpredictable * 100};
+
+ MeasureDiv(inputs);
+}
+
+} // namespace
+} // namespace random_internal_nanobenchmark
+ABSL_NAMESPACE_END
+} // namespace absl
+
+int main(int argc, char* argv[]) {
+ absl::random_internal_nanobenchmark::RunAll(argc, argv);
+ return 0;
+}
diff --git a/third_party/abseil/src/absl/random/internal/nonsecure_base.h b/third_party/abseil/src/absl/random/internal/nonsecure_base.h
new file mode 100644
index 0000000..730fa2e
--- /dev/null
+++ b/third_party/abseil/src/absl/random/internal/nonsecure_base.h
@@ -0,0 +1,150 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_RANDOM_INTERNAL_NONSECURE_BASE_H_
+#define ABSL_RANDOM_INTERNAL_NONSECURE_BASE_H_
+
+#include <algorithm>
+#include <cstdint>
+#include <iostream>
+#include <iterator>
+#include <random>
+#include <string>
+#include <type_traits>
+#include <vector>
+
+#include "absl/base/macros.h"
+#include "absl/meta/type_traits.h"
+#include "absl/random/internal/pool_urbg.h"
+#include "absl/random/internal/salted_seed_seq.h"
+#include "absl/random/internal/seed_material.h"
+#include "absl/types/optional.h"
+#include "absl/types/span.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace random_internal {
+
+// Each instance of NonsecureURBGBase<URBG> will be seeded by variates produced
+// by a thread-unique URBG-instance.
+template <typename URBG>
+class NonsecureURBGBase {
+ public:
+ using result_type = typename URBG::result_type;
+
+ // Default constructor
+ NonsecureURBGBase() : urbg_(ConstructURBG()) {}
+
+ // Copy disallowed, move allowed.
+ NonsecureURBGBase(const NonsecureURBGBase&) = delete;
+ NonsecureURBGBase& operator=(const NonsecureURBGBase&) = delete;
+ NonsecureURBGBase(NonsecureURBGBase&&) = default;
+ NonsecureURBGBase& operator=(NonsecureURBGBase&&) = default;
+
+ // Constructor using a seed
+ template <class SSeq, typename = typename absl::enable_if_t<
+ !std::is_same<SSeq, NonsecureURBGBase>::value>>
+ explicit NonsecureURBGBase(SSeq&& seq)
+ : urbg_(ConstructURBG(std::forward<SSeq>(seq))) {}
+
+ // Note: on MSVC, min() or max() can be interpreted as MIN() or MAX(), so we
+ // enclose min() or max() in parens as (min)() and (max)().
+ // Additionally, clang-format requires no space before this construction.
+
+ // NonsecureURBGBase::min()
+ static constexpr result_type(min)() { return (URBG::min)(); }
+
+ // NonsecureURBGBase::max()
+ static constexpr result_type(max)() { return (URBG::max)(); }
+
+ // NonsecureURBGBase::operator()()
+ result_type operator()() { return urbg_(); }
+
+ // NonsecureURBGBase::discard()
+ void discard(unsigned long long values) { // NOLINT(runtime/int)
+ urbg_.discard(values);
+ }
+
+ bool operator==(const NonsecureURBGBase& other) const {
+ return urbg_ == other.urbg_;
+ }
+
+ bool operator!=(const NonsecureURBGBase& other) const {
+ return !(urbg_ == other.urbg_);
+ }
+
+ private:
+ // Seeder is a custom seed sequence type where generate() fills the provided
+ // buffer via the RandenPool entropy source.
+ struct Seeder {
+ using result_type = uint32_t;
+
+ size_t size() { return 0; }
+
+ template <typename OutIterator>
+ void param(OutIterator) const {}
+
+ template <typename RandomAccessIterator>
+ void generate(RandomAccessIterator begin, RandomAccessIterator end) {
+ if (begin != end) {
+ // begin, end must be random access iterators assignable from uint32_t.
+ generate_impl(
+ std::integral_constant<bool, sizeof(*begin) == sizeof(uint32_t)>{},
+ begin, end);
+ }
+ }
+
+ // Commonly, generate is invoked with a pointer to a buffer which
+ // can be cast to a uint32_t.
+ template <typename RandomAccessIterator>
+ void generate_impl(std::integral_constant<bool, true>,
+ RandomAccessIterator begin, RandomAccessIterator end) {
+ auto buffer = absl::MakeSpan(begin, end);
+ auto target = absl::MakeSpan(reinterpret_cast<uint32_t*>(buffer.data()),
+ buffer.size());
+ RandenPool<uint32_t>::Fill(target);
+ }
+
+ // The non-uint32_t case should be uncommon, and involves an extra copy,
+ // filling the uint32_t buffer and then mixing into the output.
+ template <typename RandomAccessIterator>
+ void generate_impl(std::integral_constant<bool, false>,
+ RandomAccessIterator begin, RandomAccessIterator end) {
+ const size_t n = std::distance(begin, end);
+ absl::InlinedVector<uint32_t, 8> data(n, 0);
+ RandenPool<uint32_t>::Fill(absl::MakeSpan(data.begin(), data.end()));
+ std::copy(std::begin(data), std::end(data), begin);
+ }
+ };
+
+ static URBG ConstructURBG() {
+ Seeder seeder;
+ return URBG(seeder);
+ }
+
+ template <typename SSeq>
+ static URBG ConstructURBG(SSeq&& seq) { // NOLINT(runtime/references)
+ auto salted_seq =
+ random_internal::MakeSaltedSeedSeq(std::forward<SSeq>(seq));
+ return URBG(salted_seq);
+ }
+
+ URBG urbg_;
+};
+
+} // namespace random_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_RANDOM_INTERNAL_NONSECURE_BASE_H_
diff --git a/third_party/abseil/src/absl/random/internal/nonsecure_base_test.cc b/third_party/abseil/src/absl/random/internal/nonsecure_base_test.cc
new file mode 100644
index 0000000..698027f
--- /dev/null
+++ b/third_party/abseil/src/absl/random/internal/nonsecure_base_test.cc
@@ -0,0 +1,245 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/random/internal/nonsecure_base.h"
+
+#include <algorithm>
+#include <iostream>
+#include <memory>
+#include <random>
+#include <sstream>
+
+#include "gtest/gtest.h"
+#include "absl/random/distributions.h"
+#include "absl/random/random.h"
+#include "absl/strings/str_cat.h"
+
+namespace {
+
+using ExampleNonsecureURBG =
+ absl::random_internal::NonsecureURBGBase<std::mt19937>;
+
+template <typename T>
+void Use(const T&) {}
+
+} // namespace
+
+TEST(NonsecureURBGBase, DefaultConstructorIsValid) {
+ ExampleNonsecureURBG urbg;
+}
+
+// Ensure that the recommended template-instantiations are valid.
+TEST(RecommendedTemplates, CanBeConstructed) {
+ absl::BitGen default_generator;
+ absl::InsecureBitGen insecure_generator;
+}
+
+TEST(RecommendedTemplates, CanDiscardValues) {
+ absl::BitGen default_generator;
+ absl::InsecureBitGen insecure_generator;
+
+ default_generator.discard(5);
+ insecure_generator.discard(5);
+}
+
+TEST(NonsecureURBGBase, StandardInterface) {
+ // Names after definition of [rand.req.urbg] in C++ standard.
+ // e us a value of E
+ // v is a lvalue of E
+ // x, y are possibly const values of E
+ // s is a value of T
+ // q is a value satisfying requirements of seed_sequence
+ // z is a value of type unsigned long long
+ // os is a some specialization of basic_ostream
+ // is is a some specialization of basic_istream
+
+ using E = absl::random_internal::NonsecureURBGBase<std::minstd_rand>;
+
+ using T = typename E::result_type;
+
+ static_assert(!std::is_copy_constructible<E>::value,
+ "NonsecureURBGBase should not be copy constructible");
+
+ static_assert(!absl::is_copy_assignable<E>::value,
+ "NonsecureURBGBase should not be copy assignable");
+
+ static_assert(std::is_move_constructible<E>::value,
+ "NonsecureURBGBase should be move constructible");
+
+ static_assert(absl::is_move_assignable<E>::value,
+ "NonsecureURBGBase should be move assignable");
+
+ static_assert(std::is_same<decltype(std::declval<E>()()), T>::value,
+ "return type of operator() must be result_type");
+
+ {
+ const E x, y;
+ Use(x);
+ Use(y);
+
+ static_assert(std::is_same<decltype(x == y), bool>::value,
+ "return type of operator== must be bool");
+
+ static_assert(std::is_same<decltype(x != y), bool>::value,
+ "return type of operator== must be bool");
+ }
+
+ E e;
+ std::seed_seq q{1, 2, 3};
+
+ E{};
+ E{q};
+
+ // Copy constructor not supported.
+ // E{x};
+
+ // result_type seed constructor not supported.
+ // E{T{1}};
+
+ // Move constructors are supported.
+ {
+ E tmp(q);
+ E m = std::move(tmp);
+ E n(std::move(m));
+ EXPECT_TRUE(e != n);
+ }
+
+ // Comparisons work.
+ {
+ // MSVC emits error 2718 when using EXPECT_EQ(e, x)
+ // * actual parameter with __declspec(align('#')) won't be aligned
+ E a(q);
+ E b(q);
+
+ EXPECT_TRUE(a != e);
+ EXPECT_TRUE(a == b);
+
+ a();
+ EXPECT_TRUE(a != b);
+ }
+
+ // e.seed(s) not supported.
+
+ // [rand.req.eng] specifies the parameter as 'unsigned long long'
+ // e.discard(unsigned long long) is supported.
+ unsigned long long z = 1; // NOLINT(runtime/int)
+ e.discard(z);
+}
+
+TEST(NonsecureURBGBase, SeedSeqConstructorIsValid) {
+ std::seed_seq seq;
+ ExampleNonsecureURBG rbg(seq);
+}
+
+TEST(NonsecureURBGBase, CompatibleWithDistributionUtils) {
+ ExampleNonsecureURBG rbg;
+
+ absl::Uniform(rbg, 0, 100);
+ absl::Uniform(rbg, 0.5, 0.7);
+ absl::Poisson<uint32_t>(rbg);
+ absl::Exponential<float>(rbg);
+}
+
+TEST(NonsecureURBGBase, CompatibleWithStdDistributions) {
+ ExampleNonsecureURBG rbg;
+
+ // Cast to void to suppress [[nodiscard]] warnings
+ static_cast<void>(std::uniform_int_distribution<uint32_t>(0, 100)(rbg));
+ static_cast<void>(std::uniform_real_distribution<float>()(rbg));
+ static_cast<void>(std::bernoulli_distribution(0.2)(rbg));
+}
+
+TEST(NonsecureURBGBase, ConsecutiveDefaultInstancesYieldUniqueVariates) {
+ const size_t kNumSamples = 128;
+
+ ExampleNonsecureURBG rbg1;
+ ExampleNonsecureURBG rbg2;
+
+ for (size_t i = 0; i < kNumSamples; i++) {
+ EXPECT_NE(rbg1(), rbg2());
+ }
+}
+
+TEST(NonsecureURBGBase, EqualSeedSequencesYieldEqualVariates) {
+ std::seed_seq seq;
+
+ ExampleNonsecureURBG rbg1(seq);
+ ExampleNonsecureURBG rbg2(seq);
+
+ // ExampleNonsecureURBG rbg3({1, 2, 3}); // Should not compile.
+
+ for (uint32_t i = 0; i < 1000; i++) {
+ EXPECT_EQ(rbg1(), rbg2());
+ }
+
+ rbg1.discard(100);
+ rbg2.discard(100);
+
+ // The sequences should continue after discarding
+ for (uint32_t i = 0; i < 1000; i++) {
+ EXPECT_EQ(rbg1(), rbg2());
+ }
+}
+
+// This is a PRNG-compatible type specifically designed to test
+// that NonsecureURBGBase::Seeder can correctly handle iterators
+// to arbitrary non-uint32_t size types.
+template <typename T>
+struct SeederTestEngine {
+ using result_type = T;
+
+ static constexpr result_type(min)() {
+ return (std::numeric_limits<result_type>::min)();
+ }
+ static constexpr result_type(max)() {
+ return (std::numeric_limits<result_type>::max)();
+ }
+
+ template <class SeedSequence,
+ typename = typename absl::enable_if_t<
+ !std::is_same<SeedSequence, SeederTestEngine>::value>>
+ explicit SeederTestEngine(SeedSequence&& seq) {
+ seed(seq);
+ }
+
+ SeederTestEngine(const SeederTestEngine&) = default;
+ SeederTestEngine& operator=(const SeederTestEngine&) = default;
+ SeederTestEngine(SeederTestEngine&&) = default;
+ SeederTestEngine& operator=(SeederTestEngine&&) = default;
+
+ result_type operator()() { return state[0]; }
+
+ template <class SeedSequence>
+ void seed(SeedSequence&& seq) {
+ std::fill(std::begin(state), std::end(state), T(0));
+ seq.generate(std::begin(state), std::end(state));
+ }
+
+ T state[2];
+};
+
+TEST(NonsecureURBGBase, SeederWorksForU32) {
+ using U32 =
+ absl::random_internal::NonsecureURBGBase<SeederTestEngine<uint32_t>>;
+ U32 x;
+ EXPECT_NE(0, x());
+}
+
+TEST(NonsecureURBGBase, SeederWorksForU64) {
+ using U64 =
+ absl::random_internal::NonsecureURBGBase<SeederTestEngine<uint64_t>>;
+
+ U64 x;
+ EXPECT_NE(0, x());
+}
diff --git a/third_party/abseil/src/absl/random/internal/pcg_engine.h b/third_party/abseil/src/absl/random/internal/pcg_engine.h
new file mode 100644
index 0000000..53c23fe
--- /dev/null
+++ b/third_party/abseil/src/absl/random/internal/pcg_engine.h
@@ -0,0 +1,307 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_RANDOM_INTERNAL_PCG_ENGINE_H_
+#define ABSL_RANDOM_INTERNAL_PCG_ENGINE_H_
+
+#include <type_traits>
+
+#include "absl/base/config.h"
+#include "absl/meta/type_traits.h"
+#include "absl/numeric/int128.h"
+#include "absl/random/internal/fastmath.h"
+#include "absl/random/internal/iostream_state_saver.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace random_internal {
+
+// pcg_engine is a simplified implementation of Melissa O'Neil's PCG engine in
+// C++. PCG combines a linear congruential generator (LCG) with output state
+// mixing functions to generate each random variate. pcg_engine supports only a
+// single sequence (oneseq), and does not support streams.
+//
+// pcg_engine is parameterized by two types:
+// Params, which provides the multiplier and increment values;
+// Mix, which mixes the state into the result.
+//
+template <typename Params, typename Mix>
+class pcg_engine {
+ static_assert(std::is_same<typename Params::state_type,
+ typename Mix::state_type>::value,
+ "Class-template absl::pcg_engine must be parameterized by "
+ "Params and Mix with identical state_type");
+
+ static_assert(std::is_unsigned<typename Mix::result_type>::value,
+ "Class-template absl::pcg_engine must be parameterized by "
+ "an unsigned Mix::result_type");
+
+ using params_type = Params;
+ using mix_type = Mix;
+ using state_type = typename Mix::state_type;
+
+ public:
+ // C++11 URBG interface:
+ using result_type = typename Mix::result_type;
+
+ static constexpr result_type(min)() {
+ return (std::numeric_limits<result_type>::min)();
+ }
+
+ static constexpr result_type(max)() {
+ return (std::numeric_limits<result_type>::max)();
+ }
+
+ explicit pcg_engine(uint64_t seed_value = 0) { seed(seed_value); }
+
+ template <class SeedSequence,
+ typename = typename absl::enable_if_t<
+ !std::is_same<SeedSequence, pcg_engine>::value>>
+ explicit pcg_engine(SeedSequence&& seq) {
+ seed(seq);
+ }
+
+ pcg_engine(const pcg_engine&) = default;
+ pcg_engine& operator=(const pcg_engine&) = default;
+ pcg_engine(pcg_engine&&) = default;
+ pcg_engine& operator=(pcg_engine&&) = default;
+
+ result_type operator()() {
+ // Advance the LCG state, always using the new value to generate the output.
+ state_ = lcg(state_);
+ return Mix{}(state_);
+ }
+
+ void seed(uint64_t seed_value = 0) {
+ state_type tmp = seed_value;
+ state_ = lcg(tmp + Params::increment());
+ }
+
+ template <class SeedSequence>
+ typename absl::enable_if_t<
+ !std::is_convertible<SeedSequence, uint64_t>::value, void>
+ seed(SeedSequence&& seq) {
+ reseed(seq);
+ }
+
+ void discard(uint64_t count) { state_ = advance(state_, count); }
+
+ bool operator==(const pcg_engine& other) const {
+ return state_ == other.state_;
+ }
+
+ bool operator!=(const pcg_engine& other) const { return !(*this == other); }
+
+ template <class CharT, class Traits>
+ friend typename absl::enable_if_t<(sizeof(state_type) == 16),
+ std::basic_ostream<CharT, Traits>&>
+ operator<<(
+ std::basic_ostream<CharT, Traits>& os, // NOLINT(runtime/references)
+ const pcg_engine& engine) {
+ auto saver = random_internal::make_ostream_state_saver(os);
+ random_internal::stream_u128_helper<state_type> helper;
+ helper.write(pcg_engine::params_type::multiplier(), os);
+ os << os.fill();
+ helper.write(pcg_engine::params_type::increment(), os);
+ os << os.fill();
+ helper.write(engine.state_, os);
+ return os;
+ }
+
+ template <class CharT, class Traits>
+ friend typename absl::enable_if_t<(sizeof(state_type) <= 8),
+ std::basic_ostream<CharT, Traits>&>
+ operator<<(
+ std::basic_ostream<CharT, Traits>& os, // NOLINT(runtime/references)
+ const pcg_engine& engine) {
+ auto saver = random_internal::make_ostream_state_saver(os);
+ os << pcg_engine::params_type::multiplier() << os.fill();
+ os << pcg_engine::params_type::increment() << os.fill();
+ os << engine.state_;
+ return os;
+ }
+
+ template <class CharT, class Traits>
+ friend typename absl::enable_if_t<(sizeof(state_type) == 16),
+ std::basic_istream<CharT, Traits>&>
+ operator>>(
+ std::basic_istream<CharT, Traits>& is, // NOLINT(runtime/references)
+ pcg_engine& engine) { // NOLINT(runtime/references)
+ random_internal::stream_u128_helper<state_type> helper;
+ auto mult = helper.read(is);
+ auto inc = helper.read(is);
+ auto tmp = helper.read(is);
+ if (mult != pcg_engine::params_type::multiplier() ||
+ inc != pcg_engine::params_type::increment()) {
+ // signal failure by setting the failbit.
+ is.setstate(is.rdstate() | std::ios_base::failbit);
+ }
+ if (!is.fail()) {
+ engine.state_ = tmp;
+ }
+ return is;
+ }
+
+ template <class CharT, class Traits>
+ friend typename absl::enable_if_t<(sizeof(state_type) <= 8),
+ std::basic_istream<CharT, Traits>&>
+ operator>>(
+ std::basic_istream<CharT, Traits>& is, // NOLINT(runtime/references)
+ pcg_engine& engine) { // NOLINT(runtime/references)
+ state_type mult{}, inc{}, tmp{};
+ is >> mult >> inc >> tmp;
+ if (mult != pcg_engine::params_type::multiplier() ||
+ inc != pcg_engine::params_type::increment()) {
+ // signal failure by setting the failbit.
+ is.setstate(is.rdstate() | std::ios_base::failbit);
+ }
+ if (!is.fail()) {
+ engine.state_ = tmp;
+ }
+ return is;
+ }
+
+ private:
+ state_type state_;
+
+ // Returns the linear-congruential generator next state.
+ static inline constexpr state_type lcg(state_type s) {
+ return s * Params::multiplier() + Params::increment();
+ }
+
+ // Returns the linear-congruential arbitrary seek state.
+ inline state_type advance(state_type s, uint64_t n) const {
+ state_type mult = Params::multiplier();
+ state_type inc = Params::increment();
+ state_type m = 1;
+ state_type i = 0;
+ while (n > 0) {
+ if (n & 1) {
+ m *= mult;
+ i = i * mult + inc;
+ }
+ inc = (mult + 1) * inc;
+ mult *= mult;
+ n >>= 1;
+ }
+ return m * s + i;
+ }
+
+ template <class SeedSequence>
+ void reseed(SeedSequence& seq) {
+ using sequence_result_type = typename SeedSequence::result_type;
+ constexpr size_t kBufferSize =
+ sizeof(state_type) / sizeof(sequence_result_type);
+ sequence_result_type buffer[kBufferSize];
+ seq.generate(std::begin(buffer), std::end(buffer));
+ // Convert the seed output to a single state value.
+ state_type tmp = buffer[0];
+ for (size_t i = 1; i < kBufferSize; i++) {
+ tmp <<= (sizeof(sequence_result_type) * 8);
+ tmp |= buffer[i];
+ }
+ state_ = lcg(tmp + params_type::increment());
+ }
+};
+
+// Parameterized implementation of the PCG 128-bit oneseq state.
+// This provides state_type, multiplier, and increment for pcg_engine.
+template <uint64_t kMultA, uint64_t kMultB, uint64_t kIncA, uint64_t kIncB>
+class pcg128_params {
+ public:
+#if ABSL_HAVE_INTRINSIC_INT128
+ using state_type = __uint128_t;
+ static inline constexpr state_type make_u128(uint64_t a, uint64_t b) {
+ return (static_cast<__uint128_t>(a) << 64) | b;
+ }
+#else
+ using state_type = absl::uint128;
+ static inline constexpr state_type make_u128(uint64_t a, uint64_t b) {
+ return absl::MakeUint128(a, b);
+ }
+#endif
+
+ static inline constexpr state_type multiplier() {
+ return make_u128(kMultA, kMultB);
+ }
+ static inline constexpr state_type increment() {
+ return make_u128(kIncA, kIncB);
+ }
+};
+
+// Implementation of the PCG xsl_rr_128_64 128-bit mixing function, which
+// accepts an input of state_type and mixes it into an output of result_type.
+struct pcg_xsl_rr_128_64 {
+#if ABSL_HAVE_INTRINSIC_INT128
+ using state_type = __uint128_t;
+#else
+ using state_type = absl::uint128;
+#endif
+ using result_type = uint64_t;
+
+ inline uint64_t operator()(state_type state) {
+ // This is equivalent to the xsl_rr_128_64 mixing function.
+#if ABSL_HAVE_INTRINSIC_INT128
+ uint64_t rotate = static_cast<uint64_t>(state >> 122u);
+ state ^= state >> 64;
+ uint64_t s = static_cast<uint64_t>(state);
+#else
+ uint64_t h = Uint128High64(state);
+ uint64_t rotate = h >> 58u;
+ uint64_t s = Uint128Low64(state) ^ h;
+#endif
+ return random_internal::rotr(s, rotate);
+ }
+};
+
+// Parameterized implementation of the PCG 64-bit oneseq state.
+// This provides state_type, multiplier, and increment for pcg_engine.
+template <uint64_t kMult, uint64_t kInc>
+class pcg64_params {
+ public:
+ using state_type = uint64_t;
+ static inline constexpr state_type multiplier() { return kMult; }
+ static inline constexpr state_type increment() { return kInc; }
+};
+
+// Implementation of the PCG xsh_rr_64_32 64-bit mixing function, which accepts
+// an input of state_type and mixes it into an output of result_type.
+struct pcg_xsh_rr_64_32 {
+ using state_type = uint64_t;
+ using result_type = uint32_t;
+ inline uint32_t operator()(uint64_t state) {
+ return random_internal::rotr(
+ static_cast<uint32_t>(((state >> 18) ^ state) >> 27), state >> 59);
+ }
+};
+
+// Stable pcg_engine implementations:
+// This is a 64-bit generator using 128-bits of state.
+// The output sequence is equivalent to Melissa O'Neil's pcg64_oneseq.
+using pcg64_2018_engine = pcg_engine<
+ random_internal::pcg128_params<0x2360ed051fc65da4ull, 0x4385df649fccf645ull,
+ 0x5851f42d4c957f2d, 0x14057b7ef767814f>,
+ random_internal::pcg_xsl_rr_128_64>;
+
+// This is a 32-bit generator using 64-bits of state.
+// This is equivalent to Melissa O'Neil's pcg32_oneseq.
+using pcg32_2018_engine = pcg_engine<
+ random_internal::pcg64_params<0x5851f42d4c957f2dull, 0x14057b7ef767814full>,
+ random_internal::pcg_xsh_rr_64_32>;
+
+} // namespace random_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_RANDOM_INTERNAL_PCG_ENGINE_H_
diff --git a/third_party/abseil/src/absl/random/internal/pcg_engine_test.cc b/third_party/abseil/src/absl/random/internal/pcg_engine_test.cc
new file mode 100644
index 0000000..4d763e8
--- /dev/null
+++ b/third_party/abseil/src/absl/random/internal/pcg_engine_test.cc
@@ -0,0 +1,638 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/random/internal/pcg_engine.h"
+
+#include <algorithm>
+#include <bitset>
+#include <random>
+#include <sstream>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/random/internal/explicit_seed_seq.h"
+#include "absl/time/clock.h"
+
+#define UPDATE_GOLDEN 0
+
+namespace {
+
+using absl::random_internal::ExplicitSeedSeq;
+using absl::random_internal::pcg32_2018_engine;
+using absl::random_internal::pcg64_2018_engine;
+
+template <typename EngineType>
+class PCGEngineTest : public ::testing::Test {};
+
+using EngineTypes = ::testing::Types<pcg64_2018_engine, pcg32_2018_engine>;
+
+TYPED_TEST_SUITE(PCGEngineTest, EngineTypes);
+
+TYPED_TEST(PCGEngineTest, VerifyReseedChangesAllValues) {
+ using engine_type = TypeParam;
+ using result_type = typename engine_type::result_type;
+
+ const size_t kNumOutputs = 16;
+ engine_type engine;
+
+ // MSVC emits error 2719 without the use of std::ref below.
+ // * formal parameter with __declspec(align('#')) won't be aligned
+
+ {
+ std::seed_seq seq1{1, 2, 3, 4, 5, 6, 7};
+ engine.seed(seq1);
+ }
+ result_type a[kNumOutputs];
+ std::generate(std::begin(a), std::end(a), std::ref(engine));
+
+ {
+ std::random_device rd;
+ std::seed_seq seq2{rd(), rd(), rd()};
+ engine.seed(seq2);
+ }
+ result_type b[kNumOutputs];
+ std::generate(std::begin(b), std::end(b), std::ref(engine));
+
+ // Verify that two uncorrelated values have ~50% of there bits in common. Use
+ // a 10% margin-of-error to reduce flakiness.
+ size_t changed_bits = 0;
+ size_t unchanged_bits = 0;
+ size_t total_set = 0;
+ size_t total_bits = 0;
+ size_t equal_count = 0;
+ for (size_t i = 0; i < kNumOutputs; ++i) {
+ equal_count += (a[i] == b[i]) ? 1 : 0;
+ std::bitset<sizeof(result_type) * 8> bitset(a[i] ^ b[i]);
+ changed_bits += bitset.count();
+ unchanged_bits += bitset.size() - bitset.count();
+
+ std::bitset<sizeof(result_type) * 8> a_set(a[i]);
+ std::bitset<sizeof(result_type) * 8> b_set(b[i]);
+ total_set += a_set.count() + b_set.count();
+ total_bits += 2 * 8 * sizeof(result_type);
+ }
+ // On average, half the bits are changed between two calls.
+ EXPECT_LE(changed_bits, 0.60 * (changed_bits + unchanged_bits));
+ EXPECT_GE(changed_bits, 0.40 * (changed_bits + unchanged_bits));
+
+ // verify using a quick normal-approximation to the binomial.
+ EXPECT_NEAR(total_set, total_bits * 0.5, 4 * std::sqrt(total_bits))
+ << "@" << total_set / static_cast<double>(total_bits);
+
+ // Also, A[i] == B[i] with probability (1/range) * N.
+ // Give this a pretty wide latitude, though.
+ const double kExpected = kNumOutputs / (1.0 * sizeof(result_type) * 8);
+ EXPECT_LE(equal_count, 1.0 + kExpected);
+}
+
+// Number of values that needs to be consumed to clean two sizes of buffer
+// and trigger third refresh. (slightly overestimates the actual state size).
+constexpr size_t kTwoBufferValues = 16;
+
+TYPED_TEST(PCGEngineTest, VerifyDiscard) {
+ using engine_type = TypeParam;
+
+ for (size_t num_used = 0; num_used < kTwoBufferValues; ++num_used) {
+ engine_type engine_used;
+ for (size_t i = 0; i < num_used; ++i) {
+ engine_used();
+ }
+
+ for (size_t num_discard = 0; num_discard < kTwoBufferValues;
+ ++num_discard) {
+ engine_type engine1 = engine_used;
+ engine_type engine2 = engine_used;
+ for (size_t i = 0; i < num_discard; ++i) {
+ engine1();
+ }
+ engine2.discard(num_discard);
+ for (size_t i = 0; i < kTwoBufferValues; ++i) {
+ const auto r1 = engine1();
+ const auto r2 = engine2();
+ ASSERT_EQ(r1, r2) << "used=" << num_used << " discard=" << num_discard;
+ }
+ }
+ }
+}
+
+TYPED_TEST(PCGEngineTest, StreamOperatorsResult) {
+ using engine_type = TypeParam;
+
+ std::wostringstream os;
+ std::wistringstream is;
+ engine_type engine;
+
+ EXPECT_EQ(&(os << engine), &os);
+ EXPECT_EQ(&(is >> engine), &is);
+}
+
+TYPED_TEST(PCGEngineTest, StreamSerialization) {
+ using engine_type = TypeParam;
+
+ for (size_t discard = 0; discard < kTwoBufferValues; ++discard) {
+ ExplicitSeedSeq seed_sequence{12, 34, 56};
+ engine_type engine(seed_sequence);
+ engine.discard(discard);
+
+ std::stringstream stream;
+ stream << engine;
+
+ engine_type new_engine;
+ stream >> new_engine;
+ for (size_t i = 0; i < 64; ++i) {
+ EXPECT_EQ(engine(), new_engine()) << " " << i;
+ }
+ }
+}
+
+constexpr size_t kNumGoldenOutputs = 127;
+
+// This test is checking if randen_engine is meets interface requirements
+// defined in [rand.req.urbg].
+TYPED_TEST(PCGEngineTest, RandomNumberEngineInterface) {
+ using engine_type = TypeParam;
+
+ using E = engine_type;
+ using T = typename E::result_type;
+
+ static_assert(std::is_copy_constructible<E>::value,
+ "engine_type must be copy constructible");
+
+ static_assert(absl::is_copy_assignable<E>::value,
+ "engine_type must be copy assignable");
+
+ static_assert(std::is_move_constructible<E>::value,
+ "engine_type must be move constructible");
+
+ static_assert(absl::is_move_assignable<E>::value,
+ "engine_type must be move assignable");
+
+ static_assert(std::is_same<decltype(std::declval<E>()()), T>::value,
+ "return type of operator() must be result_type");
+
+ // Names after definition of [rand.req.urbg] in C++ standard.
+ // e us a value of E
+ // v is a lvalue of E
+ // x, y are possibly const values of E
+ // s is a value of T
+ // q is a value satisfying requirements of seed_sequence
+ // z is a value of type unsigned long long
+ // os is a some specialization of basic_ostream
+ // is is a some specialization of basic_istream
+
+ E e, v;
+ const E x, y;
+ T s = 1;
+ std::seed_seq q{1, 2, 3};
+ unsigned long long z = 1; // NOLINT(runtime/int)
+ std::wostringstream os;
+ std::wistringstream is;
+
+ E{};
+ E{x};
+ E{s};
+ E{q};
+
+ e.seed();
+
+ // MSVC emits error 2718 when using EXPECT_EQ(e, x)
+ // * actual parameter with __declspec(align('#')) won't be aligned
+ EXPECT_TRUE(e == x);
+
+ e.seed(q);
+ {
+ E tmp(q);
+ EXPECT_TRUE(e == tmp);
+ }
+
+ e();
+ {
+ E tmp(q);
+ EXPECT_TRUE(e != tmp);
+ }
+
+ e.discard(z);
+
+ static_assert(std::is_same<decltype(x == y), bool>::value,
+ "return type of operator== must be bool");
+
+ static_assert(std::is_same<decltype(x != y), bool>::value,
+ "return type of operator== must be bool");
+}
+
+TYPED_TEST(PCGEngineTest, RandenEngineSFINAETest) {
+ using engine_type = TypeParam;
+ using result_type = typename engine_type::result_type;
+
+ {
+ engine_type engine(result_type(1));
+ engine.seed(result_type(1));
+ }
+
+ {
+ result_type n = 1;
+ engine_type engine(n);
+ engine.seed(n);
+ }
+
+ {
+ engine_type engine(1);
+ engine.seed(1);
+ }
+
+ {
+ int n = 1;
+ engine_type engine(n);
+ engine.seed(n);
+ }
+
+ {
+ std::seed_seq seed_seq;
+ engine_type engine(seed_seq);
+ engine.seed(seed_seq);
+ }
+
+ {
+ engine_type engine{std::seed_seq()};
+ engine.seed(std::seed_seq());
+ }
+}
+
+// ------------------------------------------------------------------
+// Stability tests for pcg64_2018_engine
+// ------------------------------------------------------------------
+TEST(PCG642018EngineTest, VerifyGolden) {
+ constexpr uint64_t kGolden[kNumGoldenOutputs] = {
+ 0x01070196e695f8f1, 0x703ec840c59f4493, 0xe54954914b3a44fa,
+ 0x96130ff204b9285e, 0x7d9fdef535ceb21a, 0x666feed42e1219a0,
+ 0x981f685721c8326f, 0xad80710d6eab4dda, 0xe202c480b037a029,
+ 0x5d3390eaedd907e2, 0x0756befb39c6b8aa, 0x1fb44ba6634d62a3,
+ 0x8d20423662426642, 0x34ea910167a39fb4, 0x93010b43a80d0ab6,
+ 0x663db08a98fc568a, 0x720b0a1335956fae, 0x2c35483e31e1d3ba,
+ 0x429f39776337409d, 0xb46d99e638687344, 0x105370b96aedcaee,
+ 0x3999e92f811cff71, 0xd230f8bcb591cfc9, 0x0dce3db2ba7bdea5,
+ 0xcf2f52c91eec99af, 0x2bc7c24a8b998a39, 0xbd8af1b0d599a19c,
+ 0x56bc45abc66059f5, 0x170a46dc170f7f1e, 0xc25daf5277b85fad,
+ 0xe629c2e0c948eadb, 0x1720a796915542ed, 0x22fb0caa4f909951,
+ 0x7e0c0f4175acd83d, 0xd9fcab37ff2a860c, 0xab2280fb2054bad1,
+ 0x58e8a06f37fa9e99, 0xc3a52a30b06528c7, 0x0175f773a13fc1bd,
+ 0x731cfc584b00e840, 0x404cc7b2648069cb, 0x5bc29153b0b7f783,
+ 0x771310a38cc999d1, 0x766a572f0a71a916, 0x90f450fb4fc48348,
+ 0xf080ea3e1c7b1a0d, 0x15471a4507d66a44, 0x7d58e55a78f3df69,
+ 0x0130a094576ac99c, 0x46669cb2d04b1d87, 0x17ab5bed20191840,
+ 0x95b177d260adff3e, 0x025fb624b6ee4c07, 0xb35de4330154a95f,
+ 0xe8510fff67e24c79, 0x132c3cbcd76ed2d3, 0x35e7cc145a093904,
+ 0x9f5b5b5f81583b79, 0x3ee749a533966233, 0x4af85886cdeda8cd,
+ 0x0ca5380ecb3ef3aa, 0x4f674eb7661d3192, 0x88a29aad00cd7733,
+ 0x70b627ca045ffac6, 0x5912b43ea887623d, 0x95dc9fc6f62cf221,
+ 0x926081a12a5c905b, 0x9c57d4cd7dfce651, 0x85ab2cbf23e3bb5d,
+ 0xc5cd669f63023152, 0x3067be0fad5d898e, 0x12b56f444cb53d05,
+ 0xbc2e5a640c3434fc, 0x9280bff0e4613fe1, 0x98819094c528743e,
+ 0x999d1c98d829df33, 0x9ff82a012dc89242, 0xf99183ed39c8be94,
+ 0xf0f59161cd421c55, 0x3c705730c2f6c48d, 0x66ad85c6e9278a61,
+ 0x2a3428e4a428d5d0, 0x79207d68fd04940d, 0xea7f2b402edc8430,
+ 0xa06b419ac857f63b, 0xcb1dd0e6fbc47e1c, 0x4f55229200ada6a4,
+ 0x9647b5e6359c927f, 0x30bf8f9197c7efe5, 0xa79519529cc384d0,
+ 0xbb22c4f339ad6497, 0xd7b9782f59d14175, 0x0dff12fff2ec0118,
+ 0xa331ad8305343a7c, 0x48dad7e3f17e0862, 0x324c6fb3fd3c9665,
+ 0xf0e4350e7933dfc4, 0x7ccda2f30b8b03b6, 0xa0afc6179005de40,
+ 0xee65da6d063b3a30, 0xb9506f42f2bfe87a, 0xc9a2e26b0ef5baa0,
+ 0x39fa9d4f495011d6, 0xbecc21a45d023948, 0x6bf484c6593f737f,
+ 0x8065e0070cadc3b7, 0x9ef617ed8d419799, 0xac692cf8c233dd15,
+ 0xd2ed87583c4ebb98, 0xad95ba1bebfedc62, 0x9b60b160a8264e43,
+ 0x0bc8c45f71fcf25b, 0x4a78035cdf1c9931, 0x4602dc106667e029,
+ 0xb335a3c250498ac8, 0x0256ebc4df20cab8, 0x0c61efd153f0c8d9,
+ 0xe5d0150a4f806f88, 0x99d6521d351e7d87, 0x8d4888c9f80f4325,
+ 0x106c5735c1ba868d, 0x73414881b880a878, 0x808a9a58a3064751,
+ 0x339a29f3746de3d5, 0x5410d7fa4f873896, 0xd84623c81d7b8a03,
+ 0x1f7c7e7a7f47f462,
+ };
+
+ pcg64_2018_engine engine(0);
+#if UPDATE_GOLDEN
+ (void)kGolden; // Silence warning.
+ for (size_t i = 0; i < kNumGoldenOutputs; ++i) {
+ printf("0x%016lx, ", engine());
+ if (i % 3 == 2) {
+ printf("\n");
+ }
+ }
+ printf("\n\n\n");
+#else
+ for (const auto& elem : kGolden) {
+ EXPECT_EQ(elem, engine());
+ }
+ engine.seed();
+ for (const auto& elem : kGolden) {
+ EXPECT_EQ(elem, engine());
+ }
+#endif
+}
+
+TEST(PCG642018EngineTest, VerifyGoldenSeeded) {
+ constexpr uint64_t kGolden[kNumGoldenOutputs] = {
+ 0xb03988f1e39691ee, 0xbd2a1eb5ac31e97a, 0x8f00d6d433634d02,
+ 0x1823c28d483d5776, 0x000c3ee3e1aeb74a, 0xfa82ef27a4f3df9c,
+ 0xc6f382308654e454, 0x414afb1a238996c2, 0x4703a4bc252eb411,
+ 0x99d64f62c8f7f654, 0xbb07ebe11a34fa44, 0x79eb06a363c06131,
+ 0xf66ad3756f1c6b21, 0x130c01d5e869f457, 0x5ca2b9963aecbc81,
+ 0xfef7bebc1de27e6c, 0x1d174faa5ed2cdbf, 0xd75b7a773f2bb889,
+ 0xc35c872327a170a5, 0x46da6d88646a42fe, 0x4622985e0442dae2,
+ 0xbe3cbd67297f1f9b, 0xe7c37b4a4798bfd1, 0x173d5dfad15a25c3,
+ 0x0eb6849ba2961522, 0xb0ff7246e6700d73, 0x88cb9c42d3afa577,
+ 0xb609731dbd94d917, 0xd3941cda04b40081, 0x28d140f7409bea3a,
+ 0x3c96699a920a124a, 0xdb28be521958b2fd, 0x0a3f44db3d4c5124,
+ 0x7ac8e60ba13b70d2, 0x75f03a41ded5195a, 0xaed10ac7c4e4825d,
+ 0xb92a3b18aadb7adc, 0xda45e0081f2bca46, 0x74d39ab3753143fc,
+ 0xb686038018fac9ca, 0x4cc309fe99542dbb, 0xf3e1a4fcb311097c,
+ 0x58763d6fa698d69d, 0xd11c365dbecd8d60, 0x2c15d55725b1dee7,
+ 0x89805f254d85658c, 0x2374c44dfc62158b, 0x9a8350fa7995328d,
+ 0x198f838970cf91da, 0x96aff569562c0e53, 0xd76c8c52b7ec6e3f,
+ 0x23a01cd9ae4baa81, 0x3adb366b6d02a893, 0xb3313e2a4c5b333f,
+ 0x04c11230b96a5425, 0x1f7f7af04787d571, 0xaddb019365275ec7,
+ 0x5c960468ccb09f42, 0x8438db698c69a44a, 0x492be1e46111637e,
+ 0x9c6c01e18100c610, 0xbfe48e75b7d0aceb, 0xb5e0b89ec1ce6a00,
+ 0x9d280ecbc2fe8997, 0x290d9e991ba5fcab, 0xeec5bec7d9d2a4f0,
+ 0x726e81488f19150e, 0x1a6df7955a7e462c, 0x37a12d174ba46bb5,
+ 0x3cdcdffd96b1b5c5, 0x2c5d5ac10661a26e, 0xa742ed18f22e50c4,
+ 0x00e0ed88ff0d8a35, 0x3d3c1718cb1efc0b, 0x1d70c51ffbccbf11,
+ 0xfbbb895132a4092f, 0x619d27f2fb095f24, 0x69af68200985e5c4,
+ 0xbee4885f57373f8d, 0x10b7a6bfe0587e40, 0xa885e6cf2f7e5f0a,
+ 0x59f879464f767550, 0x24e805d69056990d, 0x860970b911095891,
+ 0xca3189954f84170d, 0x6652a5edd4590134, 0x5e1008cef76174bf,
+ 0xcbd417881f2bcfe5, 0xfd49fc9d706ecd17, 0xeebf540221ebd066,
+ 0x46af7679464504cb, 0xd4028486946956f1, 0xd4f41864b86c2103,
+ 0x7af090e751583372, 0x98cdaa09278cb642, 0xffd42b921215602f,
+ 0x1d05bec8466b1740, 0xf036fa78a0132044, 0x787880589d1ecc78,
+ 0x5644552cfef33230, 0x0a97e275fe06884b, 0x96d1b13333d470b5,
+ 0xc8b3cdad52d3b034, 0x091357b9db7376fd, 0xa5fe4232555edf8c,
+ 0x3371bc3b6ada76b5, 0x7deeb2300477c995, 0x6fc6d4244f2849c1,
+ 0x750e8cc797ca340a, 0x81728613cd79899f, 0x3467f4ee6f9aeb93,
+ 0x5ef0a905f58c640f, 0x432db85e5101c98a, 0x6488e96f46ac80c2,
+ 0x22fddb282625048c, 0x15b287a0bc2d4c5d, 0xa7e2343ef1f28bce,
+ 0xc87ee1aa89bed09e, 0x220610107812c5e9, 0xcbdab6fcd640f586,
+ 0x8d41047970928784, 0x1aa431509ec1ade0, 0xac3f0be53f518ddc,
+ 0x16f4428ad81d0cbb, 0x675b13c2736fc4bb, 0x6db073afdd87e32d,
+ 0x572f3ca2f1a078c6,
+ };
+
+ ExplicitSeedSeq seed_sequence{12, 34, 56};
+ pcg64_2018_engine engine(seed_sequence);
+#if UPDATE_GOLDEN
+ (void)kGolden; // Silence warning.
+ for (size_t i = 0; i < kNumGoldenOutputs; ++i) {
+ printf("0x%016lx, ", engine());
+ if (i % 3 == 2) {
+ printf("\n");
+ }
+ }
+ printf("\n\n\n");
+#else
+ for (const auto& elem : kGolden) {
+ EXPECT_EQ(elem, engine());
+ }
+ engine.seed(seed_sequence);
+ for (const auto& elem : kGolden) {
+ EXPECT_EQ(elem, engine());
+ }
+#endif
+}
+
+TEST(PCG642018EngineTest, VerifyGoldenFromDeserializedEngine) {
+ constexpr uint64_t kGolden[kNumGoldenOutputs] = {
+ 0xdd425b47b4113dea, 0x1b07176479d444b0, 0x6b391027586f2e42,
+ 0xa166f2b15f4a2143, 0xffb6dbd7a179ee97, 0xb2c00035365bf0b1,
+ 0x8fbb518b45855521, 0xfc789a55ddf87c3b, 0x429531f0f17ff355,
+ 0xbe708560d603d283, 0x5bff415175c5cb6b, 0xe813491f4ad45394,
+ 0xa853f4506d55880d, 0x7e538453e568172e, 0xe101f1e098ddd0ec,
+ 0x6ee31266ee4c766d, 0xa8786d92d66b39d7, 0xfee622a2acf5e5b0,
+ 0x5fe8e82c102fa7b3, 0x01f10be4cdb53c9d, 0xbe0545366f857022,
+ 0x12e74f010a339bca, 0xb10d85ca40d5ce34, 0xe80d6feba5054875,
+ 0x2b7c1ee6d567d4ee, 0x2a9cd043bfd03b66, 0x5cfc531bd239f3f1,
+ 0x1c4734e4647d70f5, 0x85a8f60f006b5760, 0x6a4239ce76dca387,
+ 0x8da0f86d7339335c, 0xf055b0468551374d, 0x486e8567e9bea9a0,
+ 0x4cb531b8405192dd, 0xf813b1ee3157110b, 0x214c2a664a875d8e,
+ 0x74531237b29b35f7, 0xa6f0267bb77a771e, 0x64b552bff54184a4,
+ 0xa2d6f7af2d75b6fc, 0x460a10018e03b5ab, 0x76fd1fdcb81d0800,
+ 0x76f5f81805070d9d, 0x1fb75cb1a70b289a, 0x9dfd25a022c4b27f,
+ 0x9a31a14a80528e9e, 0x910dc565ddc25820, 0xd6aef8e2b0936c10,
+ 0xe1773c507fe70225, 0xe027fd7aadd632bc, 0xc1fecb427089c8b8,
+ 0xb5c74c69fa9dbf26, 0x71bf9b0e4670227d, 0x25f48fad205dcfdd,
+ 0x905248ec4d689c56, 0x5c2b7631b0de5c9d, 0x9f2ee0f8f485036c,
+ 0xfd6ce4ebb90bf7ea, 0xd435d20046085574, 0x6b7eadcb0625f986,
+ 0x679d7d44b48be89e, 0x49683b8e1cdc49de, 0x4366cf76e9a2f4ca,
+ 0x54026ec1cdad7bed, 0xa9a04385207f28d3, 0xc8e66de4eba074b2,
+ 0x40b08c42de0f4cc0, 0x1d4c5e0e93c5bbc0, 0x19b80792e470ae2d,
+ 0x6fcaaeaa4c2a5bd9, 0xa92cb07c4238438e, 0x8bb5c918a007e298,
+ 0x7cd671e944874cf4, 0x88166470b1ba3cac, 0xd013d476eaeeade6,
+ 0xcee416947189b3c3, 0x5d7c16ab0dce6088, 0xd3578a5c32b13d27,
+ 0x3875db5adc9cc973, 0xfbdaba01c5b5dc56, 0xffc4fdd391b231c3,
+ 0x2334520ecb164fec, 0x361c115e7b6de1fa, 0xeee58106cc3563d7,
+ 0x8b7f35a8db25ebb8, 0xb29d00211e2cafa6, 0x22a39fe4614b646b,
+ 0x92ca6de8b998506d, 0x40922fe3d388d1db, 0x9da47f1e540f802a,
+ 0x811dceebf16a25db, 0xf6524ae22e0e53a9, 0x52d9e780a16eb99d,
+ 0x4f504286bb830207, 0xf6654d4786bd5cc3, 0x00bd98316003a7e1,
+ 0xefda054a6ab8f5f3, 0x46cfb0f4c1872827, 0xc22b316965c0f3b2,
+ 0xd1a28087c7e7562a, 0xaa4f6a094b7f5cff, 0xfe2bc853a041f7da,
+ 0xe9d531402a83c3ba, 0xe545d8663d3ce4dd, 0xfa2dcd7d91a13fa8,
+ 0xda1a080e52a127b8, 0x19c98f1f809c3d84, 0x2cef109af4678c88,
+ 0x53462accab3b9132, 0x176b13a80415394e, 0xea70047ef6bc178b,
+ 0x57bca80506d6dcdf, 0xd853ba09ff09f5c4, 0x75f4df3a7ddd4775,
+ 0x209c367ade62f4fe, 0xa9a0bbc74d5f4682, 0x5dfe34bada86c21a,
+ 0xc2c05bbcd38566d1, 0x6de8088e348c916a, 0x6a7001c6000c2196,
+ 0xd9fb51865fc4a367, 0x12f320e444ece8ff, 0x6d56f7f793d65035,
+ 0x138f31b7a865f8aa, 0x58fc68b4026b9adf, 0xcd48954b79fb6436,
+ 0x27dfce4a0232af87,
+ };
+
+#if UPDATE_GOLDEN
+ (void)kGolden; // Silence warning.
+ std::seed_seq seed_sequence{1, 2, 3};
+ pcg64_2018_engine engine(seed_sequence);
+ std::ostringstream stream;
+ stream << engine;
+ auto str = stream.str();
+ printf("%s\n\n", str.c_str());
+ for (size_t i = 0; i < kNumGoldenOutputs; ++i) {
+ printf("0x%016lx, ", engine());
+ if (i % 3 == 2) {
+ printf("\n");
+ }
+ }
+ printf("\n\n\n");
+#else
+ pcg64_2018_engine engine;
+ std::istringstream stream(
+ "2549297995355413924 4865540595714422341 6364136223846793005 "
+ "1442695040888963407 18088519957565336995 4845369368158826708");
+ stream >> engine;
+ for (const auto& elem : kGolden) {
+ EXPECT_EQ(elem, engine());
+ }
+#endif
+}
+
+// ------------------------------------------------------------------
+// Stability tests for pcg32_2018_engine
+// ------------------------------------------------------------------
+TEST(PCG322018EngineTest, VerifyGolden) {
+ constexpr uint32_t kGolden[kNumGoldenOutputs] = {
+ 0x7a7ecbd9, 0x89fd6c06, 0xae646aa8, 0xcd3cf945, 0x6204b303, 0x198c8585,
+ 0x49fce611, 0xd1e9297a, 0x142d9440, 0xee75f56b, 0x473a9117, 0xe3a45903,
+ 0xbce807a1, 0xe54e5f4d, 0x497d6c51, 0x61829166, 0xa740474b, 0x031912a8,
+ 0x9de3defa, 0xd266dbf1, 0x0f38bebb, 0xec3c4f65, 0x07c5057d, 0xbbce03c8,
+ 0xfd2ac7a8, 0xffcf4773, 0x5b10affb, 0xede1c842, 0xe22b01b7, 0xda133c8c,
+ 0xaf89b0f4, 0x25d1b8bc, 0x9f625482, 0x7bfd6882, 0x2e2210c0, 0x2c8fb9a6,
+ 0x42cb3b83, 0x40ce0dab, 0x644a3510, 0x36230ef2, 0xe2cb6d43, 0x1012b343,
+ 0x746c6c9f, 0x36714cf8, 0xed1f5026, 0x8bbbf83e, 0xe98710f4, 0x8a2afa36,
+ 0x09035349, 0x6dc1a487, 0x682b634b, 0xc106794f, 0x7dd78beb, 0x628c262b,
+ 0x852fb232, 0xb153ac4c, 0x4f169d1b, 0xa69ab774, 0x4bd4b6f2, 0xdc351dd3,
+ 0x93ff3c8c, 0xa30819ab, 0xff07758c, 0x5ab13c62, 0xd16d7fb5, 0xc4950ffa,
+ 0xd309ae49, 0xb9677a87, 0x4464e317, 0x90dc44f1, 0xc694c1d4, 0x1d5e1168,
+ 0xadf37a2d, 0xda38990d, 0x1ec4bd33, 0x36ca25ce, 0xfa0dc76a, 0x968a9d43,
+ 0x6950ac39, 0xdd3276bc, 0x06d5a71e, 0x1f6f282d, 0x5c626c62, 0xdde3fc31,
+ 0x152194ce, 0xc35ed14c, 0xb1f7224e, 0x47f76bb8, 0xb34fdd08, 0x7011395e,
+ 0x162d2a49, 0x0d1bf09f, 0x9428a952, 0x03c5c344, 0xd3525616, 0x7816fff3,
+ 0x6bceb8a8, 0x8345a081, 0x366420fd, 0x182abeda, 0x70f82745, 0xaf15ded8,
+ 0xc7f52ca2, 0xa98db9c5, 0x919d99ba, 0x9c376c1c, 0xed8d34c2, 0x716ae9f5,
+ 0xef062fa5, 0xee3b6c56, 0x52325658, 0x61afa9c3, 0xfdaf02f0, 0x961cf3ab,
+ 0x9f291565, 0x4fbf3045, 0x0590c899, 0xde901385, 0x45005ffb, 0x509db162,
+ 0x262fa941, 0x4c421653, 0x4b17c21e, 0xea0d1530, 0xde803845, 0x61bfd515,
+ 0x438523ef,
+ };
+
+ pcg32_2018_engine engine(0);
+#if UPDATE_GOLDEN
+ (void)kGolden; // Silence warning.
+ for (size_t i = 0; i < kNumGoldenOutputs; ++i) {
+ printf("0x%08x, ", engine());
+ if (i % 6 == 5) {
+ printf("\n");
+ }
+ }
+ printf("\n\n\n");
+#else
+ for (const auto& elem : kGolden) {
+ EXPECT_EQ(elem, engine());
+ }
+ engine.seed();
+ for (const auto& elem : kGolden) {
+ EXPECT_EQ(elem, engine());
+ }
+#endif
+}
+
+TEST(PCG322018EngineTest, VerifyGoldenSeeded) {
+ constexpr uint32_t kGolden[kNumGoldenOutputs] = {
+ 0x60b5a64c, 0x978502f9, 0x80a75f60, 0x241f1158, 0xa4cd1dbb, 0xe7284017,
+ 0x3b678da5, 0x5223ec99, 0xe4bdd5d9, 0x72190e6d, 0xe6e702c9, 0xff80c768,
+ 0xcf126ed3, 0x1fbd20ab, 0x60980489, 0xbc72bf89, 0x407ac6c0, 0x00bf3c51,
+ 0xf9087897, 0x172e4eb6, 0xe9e4f443, 0x1a6098bf, 0xbf44f8c2, 0xdd84a0e5,
+ 0xd9a52364, 0xc0e2e786, 0x061ae2ba, 0x9facb8e3, 0x6109432d, 0xd4e0a013,
+ 0xbd8eb9a6, 0x7e86c3b6, 0x629c0e68, 0x05337430, 0xb495b9f4, 0x11ccd65d,
+ 0xb578db25, 0x66f1246d, 0x6ef20a7f, 0x5e429812, 0x11772130, 0xb944b5c2,
+ 0x01624128, 0xa2385ab7, 0xd3e10d35, 0xbe570ec3, 0xc951656f, 0xbe8944a0,
+ 0x7be41062, 0x5709f919, 0xd745feda, 0x9870b9ae, 0xb44b8168, 0x19e7683b,
+ 0xded8017f, 0xc6e4d544, 0x91ae4225, 0xd6745fba, 0xb992f284, 0x65b12b33,
+ 0xa9d5fdb4, 0xf105ce1a, 0x35ca1a6e, 0x2ff70dd0, 0xd8335e49, 0xfb71ddf2,
+ 0xcaeabb89, 0x5c6f5f84, 0x9a811a7d, 0xbcecbbd1, 0x0f661ba0, 0x9ad93b9d,
+ 0xedd23e0b, 0x42062f48, 0xd38dd7e4, 0x6cd63c9c, 0x640b98ae, 0x4bff5653,
+ 0x12626371, 0x13266017, 0xe7a698d8, 0x39c74667, 0xe8fdf2e3, 0x52803bf8,
+ 0x2af6895b, 0x91335b7b, 0x699e4961, 0x00a40fff, 0x253ff2b6, 0x4a6cf672,
+ 0x9584e85f, 0xf2a5000c, 0x4d58aba8, 0xb8513e6a, 0x767fad65, 0x8e326f9e,
+ 0x182f15a1, 0x163dab52, 0xdf99c780, 0x047282a1, 0xee4f90dd, 0xd50394ae,
+ 0x6c9fd5f0, 0xb06a9194, 0x387e3840, 0x04a9487b, 0xf678a4c2, 0xd0a78810,
+ 0xd502c97e, 0xd6a9b12a, 0x4accc5dc, 0x416ed53e, 0x50411536, 0xeeb89c24,
+ 0x813a7902, 0x034ebca6, 0xffa52e7c, 0x7ecd3d0e, 0xfa37a0d2, 0xb1fbe2c1,
+ 0xb7efc6d1, 0xefa4ccee, 0xf6f80424, 0x2283f3d9, 0x68732284, 0x94f3b5c8,
+ 0xbbdeceb9,
+ };
+
+ ExplicitSeedSeq seed_sequence{12, 34, 56};
+ pcg32_2018_engine engine(seed_sequence);
+#if UPDATE_GOLDEN
+ (void)kGolden; // Silence warning.
+ for (size_t i = 0; i < kNumGoldenOutputs; ++i) {
+ printf("0x%08x, ", engine());
+ if (i % 6 == 5) {
+ printf("\n");
+ }
+ }
+ printf("\n\n\n");
+#else
+ for (const auto& elem : kGolden) {
+ EXPECT_EQ(elem, engine());
+ }
+ engine.seed(seed_sequence);
+ for (const auto& elem : kGolden) {
+ EXPECT_EQ(elem, engine());
+ }
+#endif
+}
+
+TEST(PCG322018EngineTest, VerifyGoldenFromDeserializedEngine) {
+ constexpr uint64_t kGolden[kNumGoldenOutputs] = {
+ 0x780f7042, 0xba137215, 0x43ab6f22, 0x0cb55f46, 0x44b2627d, 0x835597af,
+ 0xea973ea1, 0x0d2abd35, 0x4fdd601c, 0xac4342fe, 0x7db7e93c, 0xe56ebcaf,
+ 0x3596470a, 0x7770a9ad, 0x9b893320, 0x57db3415, 0xb432de54, 0xa02baf71,
+ 0xa256aadb, 0x88921fc7, 0xa35fa6b3, 0xde3eca46, 0x605739a7, 0xa890b82b,
+ 0xe457b7ad, 0x335fb903, 0xeb06790c, 0xb3c54bf6, 0x6141e442, 0xa599a482,
+ 0xb78987cc, 0xc61dfe9d, 0x0f1d6ace, 0x17460594, 0x8f6a5061, 0x083dc354,
+ 0xe9c337fb, 0xcfd105f7, 0x926764b6, 0x638d24dc, 0xeaac650a, 0x67d2cb9c,
+ 0xd807733c, 0x205fc52e, 0xf5399e2e, 0x6c46ddcc, 0xb603e875, 0xce113a25,
+ 0x3c8d4813, 0xfb584db8, 0xf6d255ff, 0xea80954f, 0x42e8be85, 0xb2feee72,
+ 0x62bd8d16, 0x1be4a142, 0x97dca1a4, 0xdd6e7333, 0xb2caa20e, 0xa12b1588,
+ 0xeb3a5a1a, 0x6fa5ba89, 0x077ea931, 0x8ddb1713, 0x0dd03079, 0x2c2ba965,
+ 0xa77fac17, 0xc8325742, 0x8bb893bf, 0xc2315741, 0xeaceee92, 0x81dd2ee2,
+ 0xe5214216, 0x1b9b8fb2, 0x01646d03, 0x24facc25, 0xd8c0e0bb, 0xa33fe106,
+ 0xf34fe976, 0xb3b4b44e, 0x65618fed, 0x032c6192, 0xa9dd72ce, 0xf391887b,
+ 0xf41c6a6e, 0x05c4bd6d, 0x37fa260e, 0x46b05659, 0xb5f6348a, 0x62d26d89,
+ 0x39f6452d, 0xb17b30a2, 0xbdd82743, 0x38ecae3b, 0xfe90f0a2, 0xcb2d226d,
+ 0xcf8a0b1c, 0x0eed3d4d, 0xa1f69cfc, 0xd7ac3ba5, 0xce9d9a6b, 0x121deb4c,
+ 0x4a0d03f3, 0xc1821ed1, 0x59c249ac, 0xc0abb474, 0x28149985, 0xfd9a82ba,
+ 0x5960c3b2, 0xeff00cba, 0x6073aa17, 0x25dc0919, 0x9976626e, 0xdd2ccc33,
+ 0x39ecb6ec, 0xc6e15d13, 0xfac94cfd, 0x28cfd34f, 0xf2d2c32d, 0x51c23d08,
+ 0x4fdb2f48, 0x97baa807, 0xf2c1004c, 0xc4ae8136, 0x71f31c94, 0x8c92d601,
+ 0x36caf5cd,
+ };
+
+#if UPDATE_GOLDEN
+ (void)kGolden; // Silence warning.
+ std::seed_seq seed_sequence{1, 2, 3};
+ pcg32_2018_engine engine(seed_sequence);
+ std::ostringstream stream;
+ stream << engine;
+ auto str = stream.str();
+ printf("%s\n\n", str.c_str());
+ for (size_t i = 0; i < kNumGoldenOutputs; ++i) {
+ printf("0x%08x, ", engine());
+ if (i % 6 == 5) {
+ printf("\n");
+ }
+ }
+ printf("\n\n\n");
+
+ EXPECT_FALSE(true);
+#else
+ pcg32_2018_engine engine;
+ std::istringstream stream(
+ "6364136223846793005 1442695040888963407 6537028157270659894");
+ stream >> engine;
+ for (const auto& elem : kGolden) {
+ EXPECT_EQ(elem, engine());
+ }
+#endif
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/random/internal/platform.h b/third_party/abseil/src/absl/random/internal/platform.h
new file mode 100644
index 0000000..bbdb4e6
--- /dev/null
+++ b/third_party/abseil/src/absl/random/internal/platform.h
@@ -0,0 +1,171 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_RANDOM_INTERNAL_PLATFORM_H_
+#define ABSL_RANDOM_INTERNAL_PLATFORM_H_
+
+// HERMETIC NOTE: The randen_hwaes target must not introduce duplicate
+// symbols from arbitrary system and other headers, since it may be built
+// with different flags from other targets, using different levels of
+// optimization, potentially introducing ODR violations.
+
+// -----------------------------------------------------------------------------
+// Platform Feature Checks
+// -----------------------------------------------------------------------------
+
+// Currently supported operating systems and associated preprocessor
+// symbols:
+//
+// Linux and Linux-derived __linux__
+// Android __ANDROID__ (implies __linux__)
+// Linux (non-Android) __linux__ && !__ANDROID__
+// Darwin (macOS and iOS) __APPLE__
+// Akaros (http://akaros.org) __ros__
+// Windows _WIN32
+// NaCL __native_client__
+// AsmJS __asmjs__
+// WebAssembly __wasm__
+// Fuchsia __Fuchsia__
+//
+// Note that since Android defines both __ANDROID__ and __linux__, one
+// may probe for either Linux or Android by simply testing for __linux__.
+//
+// NOTE: For __APPLE__ platforms, we use #include <TargetConditionals.h>
+// to distinguish os variants.
+//
+// http://nadeausoftware.com/articles/2012/01/c_c_tip_how_use_compiler_predefined_macros_detect_operating_system
+
+#if defined(__APPLE__)
+#include <TargetConditionals.h>
+#endif
+
+// -----------------------------------------------------------------------------
+// Architecture Checks
+// -----------------------------------------------------------------------------
+
+// These preprocessor directives are trying to determine CPU architecture,
+// including necessary headers to support hardware AES.
+//
+// ABSL_ARCH_{X86/PPC/ARM} macros determine the platform.
+#if defined(__x86_64__) || defined(__x86_64) || defined(_M_AMD64) || \
+ defined(_M_X64)
+#define ABSL_ARCH_X86_64
+#elif defined(__i386) || defined(_M_IX86)
+#define ABSL_ARCH_X86_32
+#elif defined(__aarch64__) || defined(__arm64__) || defined(_M_ARM64)
+#define ABSL_ARCH_AARCH64
+#elif defined(__arm__) || defined(__ARMEL__) || defined(_M_ARM)
+#define ABSL_ARCH_ARM
+#elif defined(__powerpc64__) || defined(__PPC64__) || defined(__powerpc__) || \
+ defined(__ppc__) || defined(__PPC__)
+#define ABSL_ARCH_PPC
+#else
+// Unsupported architecture.
+// * https://sourceforge.net/p/predef/wiki/Architectures/
+// * https://msdn.microsoft.com/en-us/library/b0084kay.aspx
+// * for gcc, clang: "echo | gcc -E -dM -"
+#endif
+
+// -----------------------------------------------------------------------------
+// Attribute Checks
+// -----------------------------------------------------------------------------
+
+// ABSL_RANDOM_INTERNAL_RESTRICT annotates whether pointers may be considered
+// to be unaliased.
+#if defined(__clang__) || defined(__GNUC__)
+#define ABSL_RANDOM_INTERNAL_RESTRICT __restrict__
+#elif defined(_MSC_VER)
+#define ABSL_RANDOM_INTERNAL_RESTRICT __restrict
+#else
+#define ABSL_RANDOM_INTERNAL_RESTRICT
+#endif
+
+// ABSL_HAVE_ACCELERATED_AES indicates whether the currently active compiler
+// flags (e.g. -maes) allow using hardware accelerated AES instructions, which
+// implies us assuming that the target platform supports them.
+#define ABSL_HAVE_ACCELERATED_AES 0
+
+#if defined(ABSL_ARCH_X86_64)
+
+#if defined(__AES__) || defined(__AVX__)
+#undef ABSL_HAVE_ACCELERATED_AES
+#define ABSL_HAVE_ACCELERATED_AES 1
+#endif
+
+#elif defined(ABSL_ARCH_PPC)
+
+// Rely on VSX and CRYPTO extensions for vcipher on PowerPC.
+#if (defined(__VEC__) || defined(__ALTIVEC__)) && defined(__VSX__) && \
+ defined(__CRYPTO__)
+#undef ABSL_HAVE_ACCELERATED_AES
+#define ABSL_HAVE_ACCELERATED_AES 1
+#endif
+
+#elif defined(ABSL_ARCH_ARM) || defined(ABSL_ARCH_AARCH64)
+
+// http://infocenter.arm.com/help/topic/com.arm.doc.ihi0053c/IHI0053C_acle_2_0.pdf
+// Rely on NEON+CRYPTO extensions for ARM.
+#if defined(__ARM_NEON) && defined(__ARM_FEATURE_CRYPTO)
+#undef ABSL_HAVE_ACCELERATED_AES
+#define ABSL_HAVE_ACCELERATED_AES 1
+#endif
+
+#endif
+
+// NaCl does not allow AES.
+#if defined(__native_client__)
+#undef ABSL_HAVE_ACCELERATED_AES
+#define ABSL_HAVE_ACCELERATED_AES 0
+#endif
+
+// ABSL_RANDOM_INTERNAL_AES_DISPATCH indicates whether the currently active
+// platform has, or should use run-time dispatch for selecting the
+// acclerated Randen implementation.
+#define ABSL_RANDOM_INTERNAL_AES_DISPATCH 0
+
+#if defined(ABSL_ARCH_X86_64)
+// Dispatch is available on x86_64
+#undef ABSL_RANDOM_INTERNAL_AES_DISPATCH
+#define ABSL_RANDOM_INTERNAL_AES_DISPATCH 1
+#elif defined(__linux__) && defined(ABSL_ARCH_PPC)
+// Or when running linux PPC
+#undef ABSL_RANDOM_INTERNAL_AES_DISPATCH
+#define ABSL_RANDOM_INTERNAL_AES_DISPATCH 1
+#elif defined(__linux__) && defined(ABSL_ARCH_AARCH64)
+// Or when running linux AArch64
+#undef ABSL_RANDOM_INTERNAL_AES_DISPATCH
+#define ABSL_RANDOM_INTERNAL_AES_DISPATCH 1
+#elif defined(__linux__) && defined(ABSL_ARCH_ARM) && (__ARM_ARCH >= 8)
+// Or when running linux ARM v8 or higher.
+// (This captures a lot of Android configurations.)
+#undef ABSL_RANDOM_INTERNAL_AES_DISPATCH
+#define ABSL_RANDOM_INTERNAL_AES_DISPATCH 1
+#endif
+
+// NaCl does not allow dispatch.
+#if defined(__native_client__)
+#undef ABSL_RANDOM_INTERNAL_AES_DISPATCH
+#define ABSL_RANDOM_INTERNAL_AES_DISPATCH 0
+#endif
+
+// iOS does not support dispatch, even on x86, since applications
+// should be bundled as fat binaries, with a different build tailored for
+// each specific supported platform/architecture.
+#if (defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE) || \
+ (defined(TARGET_OS_IPHONE_SIMULATOR) && TARGET_OS_IPHONE_SIMULATOR)
+#undef ABSL_RANDOM_INTERNAL_AES_DISPATCH
+#define ABSL_RANDOM_INTERNAL_AES_DISPATCH 0
+#endif
+
+#endif // ABSL_RANDOM_INTERNAL_PLATFORM_H_
diff --git a/third_party/abseil/src/absl/random/internal/pool_urbg.cc b/third_party/abseil/src/absl/random/internal/pool_urbg.cc
new file mode 100644
index 0000000..5bee530
--- /dev/null
+++ b/third_party/abseil/src/absl/random/internal/pool_urbg.cc
@@ -0,0 +1,254 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/random/internal/pool_urbg.h"
+
+#include <algorithm>
+#include <atomic>
+#include <cstdint>
+#include <cstring>
+#include <iterator>
+
+#include "absl/base/attributes.h"
+#include "absl/base/call_once.h"
+#include "absl/base/config.h"
+#include "absl/base/internal/endian.h"
+#include "absl/base/internal/raw_logging.h"
+#include "absl/base/internal/spinlock.h"
+#include "absl/base/internal/sysinfo.h"
+#include "absl/base/internal/unaligned_access.h"
+#include "absl/base/optimization.h"
+#include "absl/random/internal/randen.h"
+#include "absl/random/internal/seed_material.h"
+#include "absl/random/seed_gen_exception.h"
+
+using absl::base_internal::SpinLock;
+using absl::base_internal::SpinLockHolder;
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace random_internal {
+namespace {
+
+// RandenPoolEntry is a thread-safe pseudorandom bit generator, implementing a
+// single generator within a RandenPool<T>. It is an internal implementation
+// detail, and does not aim to conform to [rand.req.urng].
+//
+// NOTE: There are alignment issues when used on ARM, for instance.
+// See the allocation code in PoolAlignedAlloc().
+class RandenPoolEntry {
+ public:
+ static constexpr size_t kState = RandenTraits::kStateBytes / sizeof(uint32_t);
+ static constexpr size_t kCapacity =
+ RandenTraits::kCapacityBytes / sizeof(uint32_t);
+
+ void Init(absl::Span<const uint32_t> data) {
+ SpinLockHolder l(&mu_); // Always uncontested.
+ std::copy(data.begin(), data.end(), std::begin(state_));
+ next_ = kState;
+ }
+
+ // Copy bytes into out.
+ void Fill(uint8_t* out, size_t bytes) ABSL_LOCKS_EXCLUDED(mu_);
+
+ // Returns random bits from the buffer in units of T.
+ template <typename T>
+ inline T Generate() ABSL_LOCKS_EXCLUDED(mu_);
+
+ inline void MaybeRefill() ABSL_EXCLUSIVE_LOCKS_REQUIRED(mu_) {
+ if (next_ >= kState) {
+ next_ = kCapacity;
+ impl_.Generate(state_);
+ }
+ }
+
+ private:
+ // Randen URBG state.
+ uint32_t state_[kState] ABSL_GUARDED_BY(mu_); // First to satisfy alignment.
+ SpinLock mu_;
+ const Randen impl_;
+ size_t next_ ABSL_GUARDED_BY(mu_);
+};
+
+template <>
+inline uint8_t RandenPoolEntry::Generate<uint8_t>() {
+ SpinLockHolder l(&mu_);
+ MaybeRefill();
+ return static_cast<uint8_t>(state_[next_++]);
+}
+
+template <>
+inline uint16_t RandenPoolEntry::Generate<uint16_t>() {
+ SpinLockHolder l(&mu_);
+ MaybeRefill();
+ return static_cast<uint16_t>(state_[next_++]);
+}
+
+template <>
+inline uint32_t RandenPoolEntry::Generate<uint32_t>() {
+ SpinLockHolder l(&mu_);
+ MaybeRefill();
+ return state_[next_++];
+}
+
+template <>
+inline uint64_t RandenPoolEntry::Generate<uint64_t>() {
+ SpinLockHolder l(&mu_);
+ if (next_ >= kState - 1) {
+ next_ = kCapacity;
+ impl_.Generate(state_);
+ }
+ auto p = state_ + next_;
+ next_ += 2;
+
+ uint64_t result;
+ std::memcpy(&result, p, sizeof(result));
+ return result;
+}
+
+void RandenPoolEntry::Fill(uint8_t* out, size_t bytes) {
+ SpinLockHolder l(&mu_);
+ while (bytes > 0) {
+ MaybeRefill();
+ size_t remaining = (kState - next_) * sizeof(state_[0]);
+ size_t to_copy = std::min(bytes, remaining);
+ std::memcpy(out, &state_[next_], to_copy);
+ out += to_copy;
+ bytes -= to_copy;
+ next_ += (to_copy + sizeof(state_[0]) - 1) / sizeof(state_[0]);
+ }
+}
+
+// Number of pooled urbg entries.
+static constexpr int kPoolSize = 8;
+
+// Shared pool entries.
+static absl::once_flag pool_once;
+ABSL_CACHELINE_ALIGNED static RandenPoolEntry* shared_pools[kPoolSize];
+
+// Returns an id in the range [0 ... kPoolSize), which indexes into the
+// pool of random engines.
+//
+// Each thread to access the pool is assigned a sequential ID (without reuse)
+// from the pool-id space; the id is cached in a thread_local variable.
+// This id is assigned based on the arrival-order of the thread to the
+// GetPoolID call; this has no binary, CL, or runtime stability because
+// on subsequent runs the order within the same program may be significantly
+// different. However, as other thread IDs are not assigned sequentially,
+// this is not expected to matter.
+int GetPoolID() {
+ static_assert(kPoolSize >= 1,
+ "At least one urbg instance is required for PoolURBG");
+
+ ABSL_CONST_INIT static std::atomic<int64_t> sequence{0};
+
+#ifdef ABSL_HAVE_THREAD_LOCAL
+ static thread_local int my_pool_id = -1;
+ if (ABSL_PREDICT_FALSE(my_pool_id < 0)) {
+ my_pool_id = (sequence++ % kPoolSize);
+ }
+ return my_pool_id;
+#else
+ static pthread_key_t tid_key = [] {
+ pthread_key_t tmp_key;
+ int err = pthread_key_create(&tmp_key, nullptr);
+ if (err) {
+ ABSL_RAW_LOG(FATAL, "pthread_key_create failed with %d", err);
+ }
+ return tmp_key;
+ }();
+
+ // Store the value in the pthread_{get/set}specific. However an uninitialized
+ // value is 0, so add +1 to distinguish from the null value.
+ intptr_t my_pool_id =
+ reinterpret_cast<intptr_t>(pthread_getspecific(tid_key));
+ if (ABSL_PREDICT_FALSE(my_pool_id == 0)) {
+ // No allocated ID, allocate the next value, cache it, and return.
+ my_pool_id = (sequence++ % kPoolSize) + 1;
+ int err = pthread_setspecific(tid_key, reinterpret_cast<void*>(my_pool_id));
+ if (err) {
+ ABSL_RAW_LOG(FATAL, "pthread_setspecific failed with %d", err);
+ }
+ }
+ return my_pool_id - 1;
+#endif
+}
+
+// Allocate a RandenPoolEntry with at least 32-byte alignment, which is required
+// by ARM platform code.
+RandenPoolEntry* PoolAlignedAlloc() {
+ constexpr size_t kAlignment =
+ ABSL_CACHELINE_SIZE > 32 ? ABSL_CACHELINE_SIZE : 32;
+
+ // Not all the platforms that we build for have std::aligned_alloc, however
+ // since we never free these objects, we can over allocate and munge the
+ // pointers to the correct alignment.
+ void* memory = std::malloc(sizeof(RandenPoolEntry) + kAlignment);
+ auto x = reinterpret_cast<intptr_t>(memory);
+ auto y = x % kAlignment;
+ void* aligned =
+ (y == 0) ? memory : reinterpret_cast<void*>(x + kAlignment - y);
+ return new (aligned) RandenPoolEntry();
+}
+
+// Allocate and initialize kPoolSize objects of type RandenPoolEntry.
+//
+// The initialization strategy is to initialize one object directly from
+// OS entropy, then to use that object to seed all of the individual
+// pool instances.
+void InitPoolURBG() {
+ static constexpr size_t kSeedSize =
+ RandenTraits::kStateBytes / sizeof(uint32_t);
+ // Read the seed data from OS entropy once.
+ uint32_t seed_material[kPoolSize * kSeedSize];
+ if (!random_internal::ReadSeedMaterialFromOSEntropy(
+ absl::MakeSpan(seed_material))) {
+ random_internal::ThrowSeedGenException();
+ }
+ for (int i = 0; i < kPoolSize; i++) {
+ shared_pools[i] = PoolAlignedAlloc();
+ shared_pools[i]->Init(
+ absl::MakeSpan(&seed_material[i * kSeedSize], kSeedSize));
+ }
+}
+
+// Returns the pool entry for the current thread.
+RandenPoolEntry* GetPoolForCurrentThread() {
+ absl::call_once(pool_once, InitPoolURBG);
+ return shared_pools[GetPoolID()];
+}
+
+} // namespace
+
+template <typename T>
+typename RandenPool<T>::result_type RandenPool<T>::Generate() {
+ auto* pool = GetPoolForCurrentThread();
+ return pool->Generate<T>();
+}
+
+template <typename T>
+void RandenPool<T>::Fill(absl::Span<result_type> data) {
+ auto* pool = GetPoolForCurrentThread();
+ pool->Fill(reinterpret_cast<uint8_t*>(data.data()),
+ data.size() * sizeof(result_type));
+}
+
+template class RandenPool<uint8_t>;
+template class RandenPool<uint16_t>;
+template class RandenPool<uint32_t>;
+template class RandenPool<uint64_t>;
+
+} // namespace random_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/random/internal/pool_urbg.h b/third_party/abseil/src/absl/random/internal/pool_urbg.h
new file mode 100644
index 0000000..0572192
--- /dev/null
+++ b/third_party/abseil/src/absl/random/internal/pool_urbg.h
@@ -0,0 +1,131 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_RANDOM_INTERNAL_POOL_URBG_H_
+#define ABSL_RANDOM_INTERNAL_POOL_URBG_H_
+
+#include <cinttypes>
+#include <limits>
+
+#include "absl/random/internal/traits.h"
+#include "absl/types/span.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace random_internal {
+
+// RandenPool is a thread-safe random number generator [random.req.urbg] that
+// uses an underlying pool of Randen generators to generate values. Each thread
+// has affinity to one instance of the underlying pool generators. Concurrent
+// access is guarded by a spin-lock.
+template <typename T>
+class RandenPool {
+ public:
+ using result_type = T;
+ static_assert(std::is_unsigned<result_type>::value,
+ "RandenPool template argument must be a built-in unsigned "
+ "integer type");
+
+ static constexpr result_type(min)() {
+ return (std::numeric_limits<result_type>::min)();
+ }
+
+ static constexpr result_type(max)() {
+ return (std::numeric_limits<result_type>::max)();
+ }
+
+ RandenPool() {}
+
+ // Returns a single value.
+ inline result_type operator()() { return Generate(); }
+
+ // Fill data with random values.
+ static void Fill(absl::Span<result_type> data);
+
+ protected:
+ // Generate returns a single value.
+ static result_type Generate();
+};
+
+extern template class RandenPool<uint8_t>;
+extern template class RandenPool<uint16_t>;
+extern template class RandenPool<uint32_t>;
+extern template class RandenPool<uint64_t>;
+
+// PoolURBG uses an underlying pool of random generators to implement a
+// thread-compatible [random.req.urbg] interface with an internal cache of
+// values.
+template <typename T, size_t kBufferSize>
+class PoolURBG {
+ // Inheritance to access the protected static members of RandenPool.
+ using unsigned_type = typename make_unsigned_bits<T>::type;
+ using PoolType = RandenPool<unsigned_type>;
+ using SpanType = absl::Span<unsigned_type>;
+
+ static constexpr size_t kInitialBuffer = kBufferSize + 1;
+ static constexpr size_t kHalfBuffer = kBufferSize / 2;
+
+ public:
+ using result_type = T;
+
+ static_assert(std::is_unsigned<result_type>::value,
+ "PoolURBG must be parameterized by an unsigned integer type");
+
+ static_assert(kBufferSize > 1,
+ "PoolURBG must be parameterized by a buffer-size > 1");
+
+ static_assert(kBufferSize <= 256,
+ "PoolURBG must be parameterized by a buffer-size <= 256");
+
+ static constexpr result_type(min)() {
+ return (std::numeric_limits<result_type>::min)();
+ }
+
+ static constexpr result_type(max)() {
+ return (std::numeric_limits<result_type>::max)();
+ }
+
+ PoolURBG() : next_(kInitialBuffer) {}
+
+ // copy-constructor does not copy cache.
+ PoolURBG(const PoolURBG&) : next_(kInitialBuffer) {}
+ const PoolURBG& operator=(const PoolURBG&) {
+ next_ = kInitialBuffer;
+ return *this;
+ }
+
+ // move-constructor does move cache.
+ PoolURBG(PoolURBG&&) = default;
+ PoolURBG& operator=(PoolURBG&&) = default;
+
+ inline result_type operator()() {
+ if (next_ >= kBufferSize) {
+ next_ = (kBufferSize > 2 && next_ > kBufferSize) ? kHalfBuffer : 0;
+ PoolType::Fill(SpanType(reinterpret_cast<unsigned_type*>(state_ + next_),
+ kBufferSize - next_));
+ }
+ return state_[next_++];
+ }
+
+ private:
+ // Buffer size.
+ size_t next_; // index within state_
+ result_type state_[kBufferSize];
+};
+
+} // namespace random_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_RANDOM_INTERNAL_POOL_URBG_H_
diff --git a/third_party/abseil/src/absl/random/internal/pool_urbg_test.cc b/third_party/abseil/src/absl/random/internal/pool_urbg_test.cc
new file mode 100644
index 0000000..53f4eac
--- /dev/null
+++ b/third_party/abseil/src/absl/random/internal/pool_urbg_test.cc
@@ -0,0 +1,182 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/random/internal/pool_urbg.h"
+
+#include <algorithm>
+#include <bitset>
+#include <cmath>
+#include <cstdint>
+#include <iterator>
+
+#include "gtest/gtest.h"
+#include "absl/meta/type_traits.h"
+#include "absl/types/span.h"
+
+using absl::random_internal::PoolURBG;
+using absl::random_internal::RandenPool;
+
+namespace {
+
+// is_randen_pool trait is true when parameterized by an RandenPool
+template <typename T>
+using is_randen_pool = typename absl::disjunction< //
+ std::is_same<T, RandenPool<uint8_t>>, //
+ std::is_same<T, RandenPool<uint16_t>>, //
+ std::is_same<T, RandenPool<uint32_t>>, //
+ std::is_same<T, RandenPool<uint64_t>>>; //
+
+// MyFill either calls RandenPool::Fill() or std::generate(..., rng)
+template <typename T, typename V>
+typename absl::enable_if_t<absl::negation<is_randen_pool<T>>::value, void> //
+MyFill(T& rng, absl::Span<V> data) { // NOLINT(runtime/references)
+ std::generate(std::begin(data), std::end(data), rng);
+}
+
+template <typename T, typename V>
+typename absl::enable_if_t<is_randen_pool<T>::value, void> //
+MyFill(T& rng, absl::Span<V> data) { // NOLINT(runtime/references)
+ rng.Fill(data);
+}
+
+template <typename EngineType>
+class PoolURBGTypedTest : public ::testing::Test {};
+
+using EngineTypes = ::testing::Types< //
+ RandenPool<uint8_t>, //
+ RandenPool<uint16_t>, //
+ RandenPool<uint32_t>, //
+ RandenPool<uint64_t>, //
+ PoolURBG<uint8_t, 2>, //
+ PoolURBG<uint16_t, 2>, //
+ PoolURBG<uint32_t, 2>, //
+ PoolURBG<uint64_t, 2>, //
+ PoolURBG<unsigned int, 8>, // NOLINT(runtime/int)
+ PoolURBG<unsigned long, 8>, // NOLINT(runtime/int)
+ PoolURBG<unsigned long int, 4>, // NOLINT(runtime/int)
+ PoolURBG<unsigned long long, 4>>; // NOLINT(runtime/int)
+
+TYPED_TEST_SUITE(PoolURBGTypedTest, EngineTypes);
+
+// This test is checks that the engines meet the URBG interface requirements
+// defined in [rand.req.urbg].
+TYPED_TEST(PoolURBGTypedTest, URBGInterface) {
+ using E = TypeParam;
+ using T = typename E::result_type;
+
+ static_assert(std::is_copy_constructible<E>::value,
+ "engine must be copy constructible");
+
+ static_assert(absl::is_copy_assignable<E>::value,
+ "engine must be copy assignable");
+
+ E e;
+ const E x;
+
+ e();
+
+ static_assert(std::is_same<decltype(e()), T>::value,
+ "return type of operator() must be result_type");
+
+ E u0(x);
+ u0();
+
+ E u1 = e;
+ u1();
+}
+
+// This validates that sequences are independent.
+TYPED_TEST(PoolURBGTypedTest, VerifySequences) {
+ using E = TypeParam;
+ using result_type = typename E::result_type;
+
+ E rng;
+ (void)rng(); // Discard one value.
+
+ constexpr int kNumOutputs = 64;
+ result_type a[kNumOutputs];
+ result_type b[kNumOutputs];
+ std::fill(std::begin(b), std::end(b), 0);
+
+ // Fill a using Fill or generate, depending on the engine type.
+ {
+ E x = rng;
+ MyFill(x, absl::MakeSpan(a));
+ }
+
+ // Fill b using std::generate().
+ {
+ E x = rng;
+ std::generate(std::begin(b), std::end(b), x);
+ }
+
+ // Test that generated sequence changed as sequence of bits, i.e. if about
+ // half of the bites were flipped between two non-correlated values.
+ size_t changed_bits = 0;
+ size_t unchanged_bits = 0;
+ size_t total_set = 0;
+ size_t total_bits = 0;
+ size_t equal_count = 0;
+ for (size_t i = 0; i < kNumOutputs; ++i) {
+ equal_count += (a[i] == b[i]) ? 1 : 0;
+ std::bitset<sizeof(result_type) * 8> bitset(a[i] ^ b[i]);
+ changed_bits += bitset.count();
+ unchanged_bits += bitset.size() - bitset.count();
+
+ std::bitset<sizeof(result_type) * 8> a_set(a[i]);
+ std::bitset<sizeof(result_type) * 8> b_set(b[i]);
+ total_set += a_set.count() + b_set.count();
+ total_bits += 2 * 8 * sizeof(result_type);
+ }
+ // On average, half the bits are changed between two calls.
+ EXPECT_LE(changed_bits, 0.60 * (changed_bits + unchanged_bits));
+ EXPECT_GE(changed_bits, 0.40 * (changed_bits + unchanged_bits));
+
+ // verify using a quick normal-approximation to the binomial.
+ EXPECT_NEAR(total_set, total_bits * 0.5, 4 * std::sqrt(total_bits))
+ << "@" << total_set / static_cast<double>(total_bits);
+
+ // Also, A[i] == B[i] with probability (1/range) * N.
+ // Give this a pretty wide latitude, though.
+ const double kExpected = kNumOutputs / (1.0 * sizeof(result_type) * 8);
+ EXPECT_LE(equal_count, 1.0 + kExpected);
+}
+
+} // namespace
+
+/*
+$ nanobenchmarks 1 RandenPool construct
+$ nanobenchmarks 1 PoolURBG construct
+
+RandenPool<uint32_t> | 1 | 1000 | 48482.00 ticks | 48.48 ticks | 13.9 ns
+RandenPool<uint32_t> | 10 | 2000 | 1028795.00 ticks | 51.44 ticks | 14.7 ns
+RandenPool<uint32_t> | 100 | 1000 | 5119968.00 ticks | 51.20 ticks | 14.6 ns
+RandenPool<uint32_t> | 1000 | 500 | 25867936.00 ticks | 51.74 ticks | 14.8 ns
+
+RandenPool<uint64_t> | 1 | 1000 | 49921.00 ticks | 49.92 ticks | 14.3 ns
+RandenPool<uint64_t> | 10 | 2000 | 1208269.00 ticks | 60.41 ticks | 17.3 ns
+RandenPool<uint64_t> | 100 | 1000 | 5844955.00 ticks | 58.45 ticks | 16.7 ns
+RandenPool<uint64_t> | 1000 | 500 | 28767404.00 ticks | 57.53 ticks | 16.4 ns
+
+PoolURBG<uint32_t,8> | 1 | 1000 | 86431.00 ticks | 86.43 ticks | 24.7 ns
+PoolURBG<uint32_t,8> | 10 | 1000 | 206191.00 ticks | 20.62 ticks | 5.9 ns
+PoolURBG<uint32_t,8> | 100 | 1000 | 1516049.00 ticks | 15.16 ticks | 4.3 ns
+PoolURBG<uint32_t,8> | 1000 | 500 | 7613936.00 ticks | 15.23 ticks | 4.4 ns
+
+PoolURBG<uint64_t,4> | 1 | 1000 | 96668.00 ticks | 96.67 ticks | 27.6 ns
+PoolURBG<uint64_t,4> | 10 | 1000 | 282423.00 ticks | 28.24 ticks | 8.1 ns
+PoolURBG<uint64_t,4> | 100 | 1000 | 2609587.00 ticks | 26.10 ticks | 7.5 ns
+PoolURBG<uint64_t,4> | 1000 | 500 | 12408757.00 ticks | 24.82 ticks | 7.1 ns
+
+*/
diff --git a/third_party/abseil/src/absl/random/internal/randen.cc b/third_party/abseil/src/absl/random/internal/randen.cc
new file mode 100644
index 0000000..78a1e00
--- /dev/null
+++ b/third_party/abseil/src/absl/random/internal/randen.cc
@@ -0,0 +1,91 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/random/internal/randen.h"
+
+#include "absl/base/internal/raw_logging.h"
+#include "absl/random/internal/randen_detect.h"
+
+// RANDen = RANDom generator or beetroots in Swiss German.
+// 'Strong' (well-distributed, unpredictable, backtracking-resistant) random
+// generator, faster in some benchmarks than std::mt19937_64 and pcg64_c32.
+//
+// High-level summary:
+// 1) Reverie (see "A Robust and Sponge-Like PRNG with Improved Efficiency") is
+// a sponge-like random generator that requires a cryptographic permutation.
+// It improves upon "Provably Robust Sponge-Based PRNGs and KDFs" by
+// achieving backtracking resistance with only one Permute() per buffer.
+//
+// 2) "Simpira v2: A Family of Efficient Permutations Using the AES Round
+// Function" constructs up to 1024-bit permutations using an improved
+// Generalized Feistel network with 2-round AES-128 functions. This Feistel
+// block shuffle achieves diffusion faster and is less vulnerable to
+// sliced-biclique attacks than the Type-2 cyclic shuffle.
+//
+// 3) "Improving the Generalized Feistel" and "New criterion for diffusion
+// property" extends the same kind of improved Feistel block shuffle to 16
+// branches, which enables a 2048-bit permutation.
+//
+// We combine these three ideas and also change Simpira's subround keys from
+// structured/low-entropy counters to digits of Pi.
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace random_internal {
+namespace {
+
+struct RandenState {
+ const void* keys;
+ bool has_crypto;
+};
+
+RandenState GetRandenState() {
+ static const RandenState state = []() {
+ RandenState tmp;
+#if ABSL_RANDOM_INTERNAL_AES_DISPATCH
+ // HW AES Dispatch.
+ if (HasRandenHwAesImplementation() && CPUSupportsRandenHwAes()) {
+ tmp.has_crypto = true;
+ tmp.keys = RandenHwAes::GetKeys();
+ } else {
+ tmp.has_crypto = false;
+ tmp.keys = RandenSlow::GetKeys();
+ }
+#elif ABSL_HAVE_ACCELERATED_AES
+ // HW AES is enabled.
+ tmp.has_crypto = true;
+ tmp.keys = RandenHwAes::GetKeys();
+#else
+ // HW AES is disabled.
+ tmp.has_crypto = false;
+ tmp.keys = RandenSlow::GetKeys();
+#endif
+ return tmp;
+ }();
+ return state;
+}
+
+} // namespace
+
+Randen::Randen() {
+ auto tmp = GetRandenState();
+ keys_ = tmp.keys;
+#if ABSL_RANDOM_INTERNAL_AES_DISPATCH
+ has_crypto_ = tmp.has_crypto;
+#endif
+}
+
+} // namespace random_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/random/internal/randen.h b/third_party/abseil/src/absl/random/internal/randen.h
new file mode 100644
index 0000000..c2834aa
--- /dev/null
+++ b/third_party/abseil/src/absl/random/internal/randen.h
@@ -0,0 +1,102 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_RANDOM_INTERNAL_RANDEN_H_
+#define ABSL_RANDOM_INTERNAL_RANDEN_H_
+
+#include <cstddef>
+
+#include "absl/random/internal/platform.h"
+#include "absl/random/internal/randen_hwaes.h"
+#include "absl/random/internal/randen_slow.h"
+#include "absl/random/internal/randen_traits.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace random_internal {
+
+// RANDen = RANDom generator or beetroots in Swiss German.
+// 'Strong' (well-distributed, unpredictable, backtracking-resistant) random
+// generator, faster in some benchmarks than std::mt19937_64 and pcg64_c32.
+//
+// Randen implements the basic state manipulation methods.
+class Randen {
+ public:
+ static constexpr size_t kStateBytes = RandenTraits::kStateBytes;
+ static constexpr size_t kCapacityBytes = RandenTraits::kCapacityBytes;
+ static constexpr size_t kSeedBytes = RandenTraits::kSeedBytes;
+
+ ~Randen() = default;
+
+ Randen();
+
+ // Generate updates the randen sponge. The outer portion of the sponge
+ // (kCapacityBytes .. kStateBytes) may be consumed as PRNG state.
+ template <typename T, size_t N>
+ void Generate(T (&state)[N]) const {
+ static_assert(N * sizeof(T) == kStateBytes,
+ "Randen::Generate() requires kStateBytes of state");
+#if ABSL_RANDOM_INTERNAL_AES_DISPATCH
+ // HW AES Dispatch.
+ if (has_crypto_) {
+ RandenHwAes::Generate(keys_, state);
+ } else {
+ RandenSlow::Generate(keys_, state);
+ }
+#elif ABSL_HAVE_ACCELERATED_AES
+ // HW AES is enabled.
+ RandenHwAes::Generate(keys_, state);
+#else
+ // HW AES is disabled.
+ RandenSlow::Generate(keys_, state);
+#endif
+ }
+
+ // Absorb incorporates additional seed material into the randen sponge. After
+ // absorb returns, Generate must be called before the state may be consumed.
+ template <typename S, size_t M, typename T, size_t N>
+ void Absorb(const S (&seed)[M], T (&state)[N]) const {
+ static_assert(M * sizeof(S) == RandenTraits::kSeedBytes,
+ "Randen::Absorb() requires kSeedBytes of seed");
+
+ static_assert(N * sizeof(T) == RandenTraits::kStateBytes,
+ "Randen::Absorb() requires kStateBytes of state");
+#if ABSL_RANDOM_INTERNAL_AES_DISPATCH
+ // HW AES Dispatch.
+ if (has_crypto_) {
+ RandenHwAes::Absorb(seed, state);
+ } else {
+ RandenSlow::Absorb(seed, state);
+ }
+#elif ABSL_HAVE_ACCELERATED_AES
+ // HW AES is enabled.
+ RandenHwAes::Absorb(seed, state);
+#else
+ // HW AES is disabled.
+ RandenSlow::Absorb(seed, state);
+#endif
+ }
+
+ private:
+ const void* keys_;
+#if ABSL_RANDOM_INTERNAL_AES_DISPATCH
+ bool has_crypto_;
+#endif
+};
+
+} // namespace random_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_RANDOM_INTERNAL_RANDEN_H_
diff --git a/third_party/abseil/src/absl/random/internal/randen_benchmarks.cc b/third_party/abseil/src/absl/random/internal/randen_benchmarks.cc
new file mode 100644
index 0000000..f589172
--- /dev/null
+++ b/third_party/abseil/src/absl/random/internal/randen_benchmarks.cc
@@ -0,0 +1,174 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+#include "absl/random/internal/randen.h"
+
+#include <cstdint>
+#include <cstdio>
+#include <cstring>
+
+#include "absl/base/internal/raw_logging.h"
+#include "absl/random/internal/nanobenchmark.h"
+#include "absl/random/internal/platform.h"
+#include "absl/random/internal/randen_engine.h"
+#include "absl/random/internal/randen_hwaes.h"
+#include "absl/random/internal/randen_slow.h"
+#include "absl/strings/numbers.h"
+
+namespace {
+
+using absl::random_internal::Randen;
+using absl::random_internal::RandenHwAes;
+using absl::random_internal::RandenSlow;
+
+using absl::random_internal_nanobenchmark::FuncInput;
+using absl::random_internal_nanobenchmark::FuncOutput;
+using absl::random_internal_nanobenchmark::InvariantTicksPerSecond;
+using absl::random_internal_nanobenchmark::MeasureClosure;
+using absl::random_internal_nanobenchmark::Params;
+using absl::random_internal_nanobenchmark::PinThreadToCPU;
+using absl::random_internal_nanobenchmark::Result;
+
+// Local state parameters.
+static constexpr size_t kStateSizeT = Randen::kStateBytes / sizeof(uint64_t);
+static constexpr size_t kSeedSizeT = Randen::kSeedBytes / sizeof(uint32_t);
+
+// Randen implementation benchmarks.
+template <typename T>
+struct AbsorbFn : public T {
+ mutable uint64_t state[kStateSizeT] = {};
+ mutable uint32_t seed[kSeedSizeT] = {};
+
+ static constexpr size_t bytes() { return sizeof(seed); }
+
+ FuncOutput operator()(const FuncInput num_iters) const {
+ for (size_t i = 0; i < num_iters; ++i) {
+ this->Absorb(seed, state);
+ }
+ return state[0];
+ }
+};
+
+template <typename T>
+struct GenerateFn : public T {
+ mutable uint64_t state[kStateSizeT];
+ GenerateFn() { std::memset(state, 0, sizeof(state)); }
+
+ static constexpr size_t bytes() { return sizeof(state); }
+
+ FuncOutput operator()(const FuncInput num_iters) const {
+ const auto* keys = this->GetKeys();
+ for (size_t i = 0; i < num_iters; ++i) {
+ this->Generate(keys, state);
+ }
+ return state[0];
+ }
+};
+
+template <typename UInt>
+struct Engine {
+ mutable absl::random_internal::randen_engine<UInt> rng;
+
+ static constexpr size_t bytes() { return sizeof(UInt); }
+
+ FuncOutput operator()(const FuncInput num_iters) const {
+ for (size_t i = 0; i < num_iters - 1; ++i) {
+ rng();
+ }
+ return rng();
+ }
+};
+
+template <size_t N>
+void Print(const char* name, const size_t n, const Result (&results)[N],
+ const size_t bytes) {
+ if (n == 0) {
+ ABSL_RAW_LOG(
+ WARNING,
+ "WARNING: Measurement failed, should not happen when using "
+ "PinThreadToCPU unless the region to measure takes > 1 second.\n");
+ return;
+ }
+
+ static const double ns_per_tick = 1e9 / InvariantTicksPerSecond();
+ static constexpr const double kNsPerS = 1e9; // ns/s
+ static constexpr const double kMBPerByte = 1.0 / 1048576.0; // Mb / b
+ static auto header = [] {
+ return printf("%20s %8s: %12s ticks; %9s (%9s) %8s\n", "Name", "Count",
+ "Total", "Variance", "Time", "bytes/s");
+ }();
+ (void)header;
+
+ for (size_t i = 0; i < n; ++i) {
+ const double ticks_per_call = results[i].ticks / results[i].input;
+ const double ns_per_call = ns_per_tick * ticks_per_call;
+ const double bytes_per_ns = bytes / ns_per_call;
+ const double mb_per_s = bytes_per_ns * kNsPerS * kMBPerByte;
+ // Output
+ printf("%20s %8zu: %12.2f ticks; MAD=%4.2f%% (%6.1f ns) %8.1f Mb/s\n",
+ name, results[i].input, results[i].ticks,
+ results[i].variability * 100.0, ns_per_call, mb_per_s);
+ }
+}
+
+// Fails here
+template <typename Op, size_t N>
+void Measure(const char* name, const FuncInput (&inputs)[N]) {
+ Op op;
+
+ Result results[N];
+ Params params;
+ params.verbose = false;
+ params.max_evals = 6; // avoid test timeout
+ const size_t num_results = MeasureClosure(op, inputs, N, results, params);
+ Print(name, num_results, results, op.bytes());
+}
+
+// unpredictable == 1 but the compiler does not know that.
+void RunAll(const int argc, char* argv[]) {
+ if (argc == 2) {
+ int cpu = -1;
+ if (!absl::SimpleAtoi(argv[1], &cpu)) {
+ ABSL_RAW_LOG(FATAL, "The optional argument must be a CPU number >= 0.\n");
+ }
+ PinThreadToCPU(cpu);
+ }
+
+ // The compiler cannot reduce this to a constant.
+ const FuncInput unpredictable = (argc != 999);
+ static const FuncInput inputs[] = {unpredictable * 100, unpredictable * 1000};
+
+#if !defined(ABSL_INTERNAL_DISABLE_AES) && ABSL_HAVE_ACCELERATED_AES
+ Measure<AbsorbFn<RandenHwAes>>("Absorb (HwAes)", inputs);
+#endif
+ Measure<AbsorbFn<RandenSlow>>("Absorb (Slow)", inputs);
+
+#if !defined(ABSL_INTERNAL_DISABLE_AES) && ABSL_HAVE_ACCELERATED_AES
+ Measure<GenerateFn<RandenHwAes>>("Generate (HwAes)", inputs);
+#endif
+ Measure<GenerateFn<RandenSlow>>("Generate (Slow)", inputs);
+
+ // Measure the production engine.
+ static const FuncInput inputs1[] = {unpredictable * 1000,
+ unpredictable * 10000};
+ Measure<Engine<uint64_t>>("randen_engine<uint64_t>", inputs1);
+ Measure<Engine<uint32_t>>("randen_engine<uint32_t>", inputs1);
+}
+
+} // namespace
+
+int main(int argc, char* argv[]) {
+ RunAll(argc, argv);
+ return 0;
+}
diff --git a/third_party/abseil/src/absl/random/internal/randen_detect.cc b/third_party/abseil/src/absl/random/internal/randen_detect.cc
new file mode 100644
index 0000000..bbe7b96
--- /dev/null
+++ b/third_party/abseil/src/absl/random/internal/randen_detect.cc
@@ -0,0 +1,221 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// HERMETIC NOTE: The randen_hwaes target must not introduce duplicate
+// symbols from arbitrary system and other headers, since it may be built
+// with different flags from other targets, using different levels of
+// optimization, potentially introducing ODR violations.
+
+#include "absl/random/internal/randen_detect.h"
+
+#include <cstdint>
+#include <cstring>
+
+#include "absl/random/internal/platform.h"
+
+#if defined(ABSL_ARCH_X86_64)
+#define ABSL_INTERNAL_USE_X86_CPUID
+#elif defined(ABSL_ARCH_PPC) || defined(ABSL_ARCH_ARM) || \
+ defined(ABSL_ARCH_AARCH64)
+#if defined(__ANDROID__)
+#define ABSL_INTERNAL_USE_ANDROID_GETAUXVAL
+#define ABSL_INTERNAL_USE_GETAUXVAL
+#elif defined(__linux__)
+#define ABSL_INTERNAL_USE_LINUX_GETAUXVAL
+#define ABSL_INTERNAL_USE_GETAUXVAL
+#endif
+#endif
+
+#if defined(ABSL_INTERNAL_USE_X86_CPUID)
+#if defined(_WIN32) || defined(_WIN64)
+#include <intrin.h> // NOLINT(build/include_order)
+#pragma intrinsic(__cpuid)
+#else
+// MSVC-equivalent __cpuid intrinsic function.
+static void __cpuid(int cpu_info[4], int info_type) {
+ __asm__ volatile("cpuid \n\t"
+ : "=a"(cpu_info[0]), "=b"(cpu_info[1]), "=c"(cpu_info[2]),
+ "=d"(cpu_info[3])
+ : "a"(info_type), "c"(0));
+}
+#endif
+#endif // ABSL_INTERNAL_USE_X86_CPUID
+
+// On linux, just use the c-library getauxval call.
+#if defined(ABSL_INTERNAL_USE_LINUX_GETAUXVAL)
+
+extern "C" unsigned long getauxval(unsigned long type); // NOLINT(runtime/int)
+
+static uint32_t GetAuxval(uint32_t hwcap_type) {
+ return static_cast<uint32_t>(getauxval(hwcap_type));
+}
+
+#endif
+
+// On android, probe the system's C library for getauxval().
+// This is the same technique used by the android NDK cpu features library
+// as well as the google open-source cpu_features library.
+//
+// TODO(absl-team): Consider implementing a fallback of directly reading
+// /proc/self/auxval.
+#if defined(ABSL_INTERNAL_USE_ANDROID_GETAUXVAL)
+#include <dlfcn.h>
+
+static uint32_t GetAuxval(uint32_t hwcap_type) {
+ // NOLINTNEXTLINE(runtime/int)
+ typedef unsigned long (*getauxval_func_t)(unsigned long);
+
+ dlerror(); // Cleaning error state before calling dlopen.
+ void* libc_handle = dlopen("libc.so", RTLD_NOW);
+ if (!libc_handle) {
+ return 0;
+ }
+ uint32_t result = 0;
+ void* sym = dlsym(libc_handle, "getauxval");
+ if (sym) {
+ getauxval_func_t func;
+ memcpy(&func, &sym, sizeof(func));
+ result = static_cast<uint32_t>((*func)(hwcap_type));
+ }
+ dlclose(libc_handle);
+ return result;
+}
+
+#endif
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace random_internal {
+
+// The default return at the end of the function might be unreachable depending
+// on the configuration. Ignore that warning.
+#if defined(__clang__)
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wunreachable-code-return"
+#endif
+
+// CPUSupportsRandenHwAes returns whether the CPU is a microarchitecture
+// which supports the crpyto/aes instructions or extensions necessary to use the
+// accelerated RandenHwAes implementation.
+//
+// 1. For x86 it is sufficient to use the CPUID instruction to detect whether
+// the cpu supports AES instructions. Done.
+//
+// Fon non-x86 it is much more complicated.
+//
+// 2. When ABSL_INTERNAL_USE_GETAUXVAL is defined, use getauxval() (either
+// the direct c-library version, or the android probing version which loads
+// libc), and read the hardware capability bits.
+// This is based on the technique used by boringssl uses to detect
+// cpu capabilities, and should allow us to enable crypto in the android
+// builds where it is supported.
+//
+// 3. Use the default for the compiler architecture.
+//
+
+bool CPUSupportsRandenHwAes() {
+#if defined(ABSL_INTERNAL_USE_X86_CPUID)
+ // 1. For x86: Use CPUID to detect the required AES instruction set.
+ int regs[4];
+ __cpuid(reinterpret_cast<int*>(regs), 1);
+ return regs[2] & (1 << 25); // AES
+
+#elif defined(ABSL_INTERNAL_USE_GETAUXVAL)
+ // 2. Use getauxval() to read the hardware bits and determine
+ // cpu capabilities.
+
+#define AT_HWCAP 16
+#define AT_HWCAP2 26
+#if defined(ABSL_ARCH_PPC)
+ // For Power / PPC: Expect that the cpu supports VCRYPTO
+ // See https://members.openpowerfoundation.org/document/dl/576
+ // VCRYPTO should be present in POWER8 >= 2.07.
+ // Uses Linux kernel constants from arch/powerpc/include/uapi/asm/cputable.h
+ static const uint32_t kVCRYPTO = 0x02000000;
+ const uint32_t hwcap = GetAuxval(AT_HWCAP2);
+ return (hwcap & kVCRYPTO) != 0;
+
+#elif defined(ABSL_ARCH_ARM)
+ // For ARM: Require crypto+neon
+ // http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0500f/CIHBIBBA.html
+ // Uses Linux kernel constants from arch/arm64/include/asm/hwcap.h
+ static const uint32_t kNEON = 1 << 12;
+ uint32_t hwcap = GetAuxval(AT_HWCAP);
+ if ((hwcap & kNEON) == 0) {
+ return false;
+ }
+
+ // And use it again to detect AES.
+ static const uint32_t kAES = 1 << 0;
+ const uint32_t hwcap2 = GetAuxval(AT_HWCAP2);
+ return (hwcap2 & kAES) != 0;
+
+#elif defined(ABSL_ARCH_AARCH64)
+ // For AARCH64: Require crypto+neon
+ // http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0500f/CIHBIBBA.html
+ static const uint32_t kNEON = 1 << 1;
+ static const uint32_t kAES = 1 << 3;
+ const uint32_t hwcap = GetAuxval(AT_HWCAP);
+ return ((hwcap & kNEON) != 0) && ((hwcap & kAES) != 0);
+#endif
+
+#else // ABSL_INTERNAL_USE_GETAUXVAL
+ // 3. By default, assume that the compiler default.
+ return ABSL_HAVE_ACCELERATED_AES ? true : false;
+
+#endif
+ // NOTE: There are some other techniques that may be worth trying:
+ //
+ // * Use an environment variable: ABSL_RANDOM_USE_HWAES
+ //
+ // * Rely on compiler-generated target-based dispatch.
+ // Using x86/gcc it might look something like this:
+ //
+ // int __attribute__((target("aes"))) HasAes() { return 1; }
+ // int __attribute__((target("default"))) HasAes() { return 0; }
+ //
+ // This does not work on all architecture/compiler combinations.
+ //
+ // * On Linux consider reading /proc/cpuinfo and/or /proc/self/auxv.
+ // These files have lines which are easy to parse; for ARM/AARCH64 it is quite
+ // easy to find the Features: line and extract aes / neon. Likewise for
+ // PPC.
+ //
+ // * Fork a process and test for SIGILL:
+ //
+ // * Many architectures have instructions to read the ISA. Unfortunately
+ // most of those require that the code is running in ring 0 /
+ // protected-mode.
+ //
+ // There are several examples. e.g. Valgrind detects PPC ISA 2.07:
+ // https://github.com/lu-zero/valgrind/blob/master/none/tests/ppc64/test_isa_2_07_part1.c
+ //
+ // MRS <Xt>, ID_AA64ISAR0_EL1 ; Read ID_AA64ISAR0_EL1 into Xt
+ //
+ // uint64_t val;
+ // __asm __volatile("mrs %0, id_aa64isar0_el1" :"=&r" (val));
+ //
+ // * Use a CPUID-style heuristic database.
+ //
+ // * On Apple (__APPLE__), AES is available on Arm v8.
+ // https://stackoverflow.com/questions/45637888/how-to-determine-armv8-features-at-runtime-on-ios
+}
+
+#if defined(__clang__)
+#pragma clang diagnostic pop
+#endif
+
+} // namespace random_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/random/internal/randen_detect.h b/third_party/abseil/src/absl/random/internal/randen_detect.h
new file mode 100644
index 0000000..f283f43
--- /dev/null
+++ b/third_party/abseil/src/absl/random/internal/randen_detect.h
@@ -0,0 +1,33 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_RANDOM_INTERNAL_RANDEN_DETECT_H_
+#define ABSL_RANDOM_INTERNAL_RANDEN_DETECT_H_
+
+#include "absl/base/config.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace random_internal {
+
+// Returns whether the current CPU supports RandenHwAes implementation.
+// This typically involves supporting cryptographic extensions on whichever
+// platform is currently running.
+bool CPUSupportsRandenHwAes();
+
+} // namespace random_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_RANDOM_INTERNAL_RANDEN_DETECT_H_
diff --git a/third_party/abseil/src/absl/random/internal/randen_engine.h b/third_party/abseil/src/absl/random/internal/randen_engine.h
new file mode 100644
index 0000000..6b33731
--- /dev/null
+++ b/third_party/abseil/src/absl/random/internal/randen_engine.h
@@ -0,0 +1,230 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_RANDOM_INTERNAL_RANDEN_ENGINE_H_
+#define ABSL_RANDOM_INTERNAL_RANDEN_ENGINE_H_
+
+#include <algorithm>
+#include <cinttypes>
+#include <cstdlib>
+#include <iostream>
+#include <iterator>
+#include <limits>
+#include <type_traits>
+
+#include "absl/meta/type_traits.h"
+#include "absl/random/internal/iostream_state_saver.h"
+#include "absl/random/internal/randen.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace random_internal {
+
+// Deterministic pseudorandom byte generator with backtracking resistance
+// (leaking the state does not compromise prior outputs). Based on Reverie
+// (see "A Robust and Sponge-Like PRNG with Improved Efficiency") instantiated
+// with an improved Simpira-like permutation.
+// Returns values of type "T" (must be a built-in unsigned integer type).
+//
+// RANDen = RANDom generator or beetroots in Swiss High German.
+// 'Strong' (well-distributed, unpredictable, backtracking-resistant) random
+// generator, faster in some benchmarks than std::mt19937_64 and pcg64_c32.
+template <typename T>
+class alignas(16) randen_engine {
+ public:
+ // C++11 URBG interface:
+ using result_type = T;
+ static_assert(std::is_unsigned<result_type>::value,
+ "randen_engine template argument must be a built-in unsigned "
+ "integer type");
+
+ static constexpr result_type(min)() {
+ return (std::numeric_limits<result_type>::min)();
+ }
+
+ static constexpr result_type(max)() {
+ return (std::numeric_limits<result_type>::max)();
+ }
+
+ explicit randen_engine(result_type seed_value = 0) { seed(seed_value); }
+
+ template <class SeedSequence,
+ typename = typename absl::enable_if_t<
+ !std::is_same<SeedSequence, randen_engine>::value>>
+ explicit randen_engine(SeedSequence&& seq) {
+ seed(seq);
+ }
+
+ randen_engine(const randen_engine&) = default;
+
+ // Returns random bits from the buffer in units of result_type.
+ result_type operator()() {
+ // Refill the buffer if needed (unlikely).
+ if (next_ >= kStateSizeT) {
+ next_ = kCapacityT;
+ impl_.Generate(state_);
+ }
+
+ return state_[next_++];
+ }
+
+ template <class SeedSequence>
+ typename absl::enable_if_t<
+ !std::is_convertible<SeedSequence, result_type>::value>
+ seed(SeedSequence&& seq) {
+ // Zeroes the state.
+ seed();
+ reseed(seq);
+ }
+
+ void seed(result_type seed_value = 0) {
+ next_ = kStateSizeT;
+ // Zeroes the inner state and fills the outer state with seed_value to
+ // mimics behaviour of reseed
+ std::fill(std::begin(state_), std::begin(state_) + kCapacityT, 0);
+ std::fill(std::begin(state_) + kCapacityT, std::end(state_), seed_value);
+ }
+
+ // Inserts entropy into (part of) the state. Calling this periodically with
+ // sufficient entropy ensures prediction resistance (attackers cannot predict
+ // future outputs even if state is compromised).
+ template <class SeedSequence>
+ void reseed(SeedSequence& seq) {
+ using sequence_result_type = typename SeedSequence::result_type;
+ static_assert(sizeof(sequence_result_type) == 4,
+ "SeedSequence::result_type must be 32-bit");
+
+ constexpr size_t kBufferSize =
+ Randen::kSeedBytes / sizeof(sequence_result_type);
+ alignas(16) sequence_result_type buffer[kBufferSize];
+
+ // Randen::Absorb XORs the seed into state, which is then mixed by a call
+ // to Randen::Generate. Seeding with only the provided entropy is preferred
+ // to using an arbitrary generate() call, so use [rand.req.seed_seq]
+ // size as a proxy for the number of entropy units that can be generated
+ // without relying on seed sequence mixing...
+ const size_t entropy_size = seq.size();
+ if (entropy_size < kBufferSize) {
+ // ... and only request that many values, or 256-bits, when unspecified.
+ const size_t requested_entropy = (entropy_size == 0) ? 8u : entropy_size;
+ std::fill(std::begin(buffer) + requested_entropy, std::end(buffer), 0);
+ seq.generate(std::begin(buffer), std::begin(buffer) + requested_entropy);
+ // The Randen paper suggests preferentially initializing even-numbered
+ // 128-bit vectors of the randen state (there are 16 such vectors).
+ // The seed data is merged into the state offset by 128-bits, which
+ // implies prefering seed bytes [16..31, ..., 208..223]. Since the
+ // buffer is 32-bit values, we swap the corresponding buffer positions in
+ // 128-bit chunks.
+ size_t dst = kBufferSize;
+ while (dst > 7) {
+ // leave the odd bucket as-is.
+ dst -= 4;
+ size_t src = dst >> 1;
+ // swap 128-bits into the even bucket
+ std::swap(buffer[--dst], buffer[--src]);
+ std::swap(buffer[--dst], buffer[--src]);
+ std::swap(buffer[--dst], buffer[--src]);
+ std::swap(buffer[--dst], buffer[--src]);
+ }
+ } else {
+ seq.generate(std::begin(buffer), std::end(buffer));
+ }
+ impl_.Absorb(buffer, state_);
+
+ // Generate will be called when operator() is called
+ next_ = kStateSizeT;
+ }
+
+ void discard(uint64_t count) {
+ uint64_t step = std::min<uint64_t>(kStateSizeT - next_, count);
+ count -= step;
+
+ constexpr uint64_t kRateT = kStateSizeT - kCapacityT;
+ while (count > 0) {
+ next_ = kCapacityT;
+ impl_.Generate(state_);
+ step = std::min<uint64_t>(kRateT, count);
+ count -= step;
+ }
+ next_ += step;
+ }
+
+ bool operator==(const randen_engine& other) const {
+ return next_ == other.next_ &&
+ std::equal(std::begin(state_), std::end(state_),
+ std::begin(other.state_));
+ }
+
+ bool operator!=(const randen_engine& other) const {
+ return !(*this == other);
+ }
+
+ template <class CharT, class Traits>
+ friend std::basic_ostream<CharT, Traits>& operator<<(
+ std::basic_ostream<CharT, Traits>& os, // NOLINT(runtime/references)
+ const randen_engine<T>& engine) { // NOLINT(runtime/references)
+ using numeric_type =
+ typename random_internal::stream_format_type<result_type>::type;
+ auto saver = random_internal::make_ostream_state_saver(os);
+ for (const auto& elem : engine.state_) {
+ // In the case that `elem` is `uint8_t`, it must be cast to something
+ // larger so that it prints as an integer rather than a character. For
+ // simplicity, apply the cast all circumstances.
+ os << static_cast<numeric_type>(elem) << os.fill();
+ }
+ os << engine.next_;
+ return os;
+ }
+
+ template <class CharT, class Traits>
+ friend std::basic_istream<CharT, Traits>& operator>>(
+ std::basic_istream<CharT, Traits>& is, // NOLINT(runtime/references)
+ randen_engine<T>& engine) { // NOLINT(runtime/references)
+ using numeric_type =
+ typename random_internal::stream_format_type<result_type>::type;
+ result_type state[kStateSizeT];
+ size_t next;
+ for (auto& elem : state) {
+ // It is not possible to read uint8_t from wide streams, so it is
+ // necessary to read a wider type and then cast it to uint8_t.
+ numeric_type value;
+ is >> value;
+ elem = static_cast<result_type>(value);
+ }
+ is >> next;
+ if (is.fail()) {
+ return is;
+ }
+ std::memcpy(engine.state_, state, sizeof(engine.state_));
+ engine.next_ = next;
+ return is;
+ }
+
+ private:
+ static constexpr size_t kStateSizeT =
+ Randen::kStateBytes / sizeof(result_type);
+ static constexpr size_t kCapacityT =
+ Randen::kCapacityBytes / sizeof(result_type);
+
+ // First kCapacityT are `inner', the others are accessible random bits.
+ alignas(16) result_type state_[kStateSizeT];
+ size_t next_; // index within state_
+ Randen impl_;
+};
+
+} // namespace random_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_RANDOM_INTERNAL_RANDEN_ENGINE_H_
diff --git a/third_party/abseil/src/absl/random/internal/randen_engine_test.cc b/third_party/abseil/src/absl/random/internal/randen_engine_test.cc
new file mode 100644
index 0000000..c8e7685
--- /dev/null
+++ b/third_party/abseil/src/absl/random/internal/randen_engine_test.cc
@@ -0,0 +1,656 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/random/internal/randen_engine.h"
+
+#include <algorithm>
+#include <bitset>
+#include <random>
+#include <sstream>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/base/internal/raw_logging.h"
+#include "absl/random/internal/explicit_seed_seq.h"
+#include "absl/strings/str_cat.h"
+#include "absl/time/clock.h"
+
+#define UPDATE_GOLDEN 0
+
+using randen_u64 = absl::random_internal::randen_engine<uint64_t>;
+using randen_u32 = absl::random_internal::randen_engine<uint32_t>;
+using absl::random_internal::ExplicitSeedSeq;
+
+namespace {
+
+template <typename UIntType>
+class RandenEngineTypedTest : public ::testing::Test {};
+
+using UIntTypes = ::testing::Types<uint8_t, uint16_t, uint32_t, uint64_t>;
+
+TYPED_TEST_SUITE(RandenEngineTypedTest, UIntTypes);
+
+TYPED_TEST(RandenEngineTypedTest, VerifyReseedChangesAllValues) {
+ using randen = typename absl::random_internal::randen_engine<TypeParam>;
+ using result_type = typename randen::result_type;
+
+ const size_t kNumOutputs = (sizeof(randen) * 2 / sizeof(TypeParam)) + 1;
+ randen engine;
+
+ // MSVC emits error 2719 without the use of std::ref below.
+ // * formal parameter with __declspec(align('#')) won't be aligned
+
+ {
+ std::seed_seq seq1{1, 2, 3, 4, 5, 6, 7};
+ engine.seed(seq1);
+ }
+ result_type a[kNumOutputs];
+ std::generate(std::begin(a), std::end(a), std::ref(engine));
+
+ {
+ std::random_device rd;
+ std::seed_seq seq2{rd(), rd(), rd()};
+ engine.seed(seq2);
+ }
+ result_type b[kNumOutputs];
+ std::generate(std::begin(b), std::end(b), std::ref(engine));
+
+ // Test that generated sequence changed as sequence of bits, i.e. if about
+ // half of the bites were flipped between two non-correlated values.
+ size_t changed_bits = 0;
+ size_t unchanged_bits = 0;
+ size_t total_set = 0;
+ size_t total_bits = 0;
+ size_t equal_count = 0;
+ for (size_t i = 0; i < kNumOutputs; ++i) {
+ equal_count += (a[i] == b[i]) ? 1 : 0;
+ std::bitset<sizeof(result_type) * 8> bitset(a[i] ^ b[i]);
+ changed_bits += bitset.count();
+ unchanged_bits += bitset.size() - bitset.count();
+
+ std::bitset<sizeof(result_type) * 8> a_set(a[i]);
+ std::bitset<sizeof(result_type) * 8> b_set(b[i]);
+ total_set += a_set.count() + b_set.count();
+ total_bits += 2 * 8 * sizeof(result_type);
+ }
+ // On average, half the bits are changed between two calls.
+ EXPECT_LE(changed_bits, 0.60 * (changed_bits + unchanged_bits));
+ EXPECT_GE(changed_bits, 0.40 * (changed_bits + unchanged_bits));
+
+ // Verify using a quick normal-approximation to the binomial.
+ EXPECT_NEAR(total_set, total_bits * 0.5, 4 * std::sqrt(total_bits))
+ << "@" << total_set / static_cast<double>(total_bits);
+
+ // Also, A[i] == B[i] with probability (1/range) * N.
+ // Give this a pretty wide latitude, though.
+ const double kExpected = kNumOutputs / (1.0 * sizeof(result_type) * 8);
+ EXPECT_LE(equal_count, 1.0 + kExpected);
+}
+
+// Number of values that needs to be consumed to clean two sizes of buffer
+// and trigger third refresh. (slightly overestimates the actual state size).
+constexpr size_t kTwoBufferValues = sizeof(randen_u64) / sizeof(uint16_t) + 1;
+
+TYPED_TEST(RandenEngineTypedTest, VerifyDiscard) {
+ using randen = typename absl::random_internal::randen_engine<TypeParam>;
+
+ for (size_t num_used = 0; num_used < kTwoBufferValues; ++num_used) {
+ randen engine_used;
+ for (size_t i = 0; i < num_used; ++i) {
+ engine_used();
+ }
+
+ for (size_t num_discard = 0; num_discard < kTwoBufferValues;
+ ++num_discard) {
+ randen engine1 = engine_used;
+ randen engine2 = engine_used;
+ for (size_t i = 0; i < num_discard; ++i) {
+ engine1();
+ }
+ engine2.discard(num_discard);
+ for (size_t i = 0; i < kTwoBufferValues; ++i) {
+ const auto r1 = engine1();
+ const auto r2 = engine2();
+ ASSERT_EQ(r1, r2) << "used=" << num_used << " discard=" << num_discard;
+ }
+ }
+ }
+}
+
+TYPED_TEST(RandenEngineTypedTest, StreamOperatorsResult) {
+ using randen = typename absl::random_internal::randen_engine<TypeParam>;
+ std::wostringstream os;
+ std::wistringstream is;
+ randen engine;
+
+ EXPECT_EQ(&(os << engine), &os);
+ EXPECT_EQ(&(is >> engine), &is);
+}
+
+TYPED_TEST(RandenEngineTypedTest, StreamSerialization) {
+ using randen = typename absl::random_internal::randen_engine<TypeParam>;
+
+ for (size_t discard = 0; discard < kTwoBufferValues; ++discard) {
+ ExplicitSeedSeq seed_sequence{12, 34, 56};
+ randen engine(seed_sequence);
+ engine.discard(discard);
+
+ std::stringstream stream;
+ stream << engine;
+
+ randen new_engine;
+ stream >> new_engine;
+ for (size_t i = 0; i < 64; ++i) {
+ EXPECT_EQ(engine(), new_engine()) << " " << i;
+ }
+ }
+}
+
+constexpr size_t kNumGoldenOutputs = 127;
+
+// This test is checking if randen_engine is meets interface requirements
+// defined in [rand.req.urbg].
+TYPED_TEST(RandenEngineTypedTest, RandomNumberEngineInterface) {
+ using randen = typename absl::random_internal::randen_engine<TypeParam>;
+
+ using E = randen;
+ using T = typename E::result_type;
+
+ static_assert(std::is_copy_constructible<E>::value,
+ "randen_engine must be copy constructible");
+
+ static_assert(absl::is_copy_assignable<E>::value,
+ "randen_engine must be copy assignable");
+
+ static_assert(std::is_move_constructible<E>::value,
+ "randen_engine must be move constructible");
+
+ static_assert(absl::is_move_assignable<E>::value,
+ "randen_engine must be move assignable");
+
+ static_assert(std::is_same<decltype(std::declval<E>()()), T>::value,
+ "return type of operator() must be result_type");
+
+ // Names after definition of [rand.req.urbg] in C++ standard.
+ // e us a value of E
+ // v is a lvalue of E
+ // x, y are possibly const values of E
+ // s is a value of T
+ // q is a value satisfying requirements of seed_sequence
+ // z is a value of type unsigned long long
+ // os is a some specialization of basic_ostream
+ // is is a some specialization of basic_istream
+
+ E e, v;
+ const E x, y;
+ T s = 1;
+ std::seed_seq q{1, 2, 3};
+ unsigned long long z = 1; // NOLINT(runtime/int)
+ std::wostringstream os;
+ std::wistringstream is;
+
+ E{};
+ E{x};
+ E{s};
+ E{q};
+
+ e.seed();
+
+ // MSVC emits error 2718 when using EXPECT_EQ(e, x)
+ // * actual parameter with __declspec(align('#')) won't be aligned
+ EXPECT_TRUE(e == x);
+
+ e.seed(q);
+ {
+ E tmp(q);
+ EXPECT_TRUE(e == tmp);
+ }
+
+ e();
+ {
+ E tmp(q);
+ EXPECT_TRUE(e != tmp);
+ }
+
+ e.discard(z);
+
+ static_assert(std::is_same<decltype(x == y), bool>::value,
+ "return type of operator== must be bool");
+
+ static_assert(std::is_same<decltype(x != y), bool>::value,
+ "return type of operator== must be bool");
+}
+
+TYPED_TEST(RandenEngineTypedTest, RandenEngineSFINAETest) {
+ using randen = typename absl::random_internal::randen_engine<TypeParam>;
+ using result_type = typename randen::result_type;
+
+ {
+ randen engine(result_type(1));
+ engine.seed(result_type(1));
+ }
+
+ {
+ result_type n = 1;
+ randen engine(n);
+ engine.seed(n);
+ }
+
+ {
+ randen engine(1);
+ engine.seed(1);
+ }
+
+ {
+ int n = 1;
+ randen engine(n);
+ engine.seed(n);
+ }
+
+ {
+ std::seed_seq seed_seq;
+ randen engine(seed_seq);
+ engine.seed(seed_seq);
+ }
+
+ {
+ randen engine{std::seed_seq()};
+ engine.seed(std::seed_seq());
+ }
+}
+
+TEST(RandenTest, VerifyGoldenRanden64Default) {
+ constexpr uint64_t kGolden[kNumGoldenOutputs] = {
+ 0xc3c14f134e433977, 0xdda9f47cd90410ee, 0x887bf3087fd8ca10,
+ 0xf0b780f545c72912, 0x15dbb1d37696599f, 0x30ec63baff3c6d59,
+ 0xb29f73606f7f20a6, 0x02808a316f49a54c, 0x3b8feaf9d5c8e50e,
+ 0x9cbf605e3fd9de8a, 0xc970ae1a78183bbb, 0xd8b2ffd356301ed5,
+ 0xf4b327fe0fc73c37, 0xcdfd8d76eb8f9a19, 0xc3a506eb91420c9d,
+ 0xd5af05dd3eff9556, 0x48db1bb78f83c4a1, 0x7023920e0d6bfe8c,
+ 0x58d3575834956d42, 0xed1ef4c26b87b840, 0x8eef32a23e0b2df3,
+ 0x497cabf3431154fc, 0x4e24370570029a8b, 0xd88b5749f090e5ea,
+ 0xc651a582a970692f, 0x78fcec2cbb6342f5, 0x463cb745612f55db,
+ 0x352ee4ad1816afe3, 0x026ff374c101da7e, 0x811ef0821c3de851,
+ 0x6f7e616704c4fa59, 0xa0660379992d58fc, 0x04b0a374a3b795c7,
+ 0x915f3445685da798, 0x26802a8ac76571ce, 0x4663352533ce1882,
+ 0xb9fdefb4a24dc738, 0x5588ba3a4d6e6c51, 0xa2101a42d35f1956,
+ 0x607195a5e200f5fd, 0x7e100308f3290764, 0xe1e5e03c759c0709,
+ 0x082572cc5da6606f, 0xcbcf585399e432f1, 0xe8a2be4f8335d8f1,
+ 0x0904469acbfee8f2, 0xf08bd31b6daecd51, 0x08e8a1f1a69da69a,
+ 0x6542a20aad57bff5, 0x2e9705bb053d6b46, 0xda2fc9db0713c391,
+ 0x78e3a810213b6ffb, 0xdc16a59cdd85f8a6, 0xc0932718cd55781f,
+ 0xb9bfb29c2b20bfe5, 0xb97289c1be0f2f9c, 0xc0a2a0e403a892d4,
+ 0x5524bb834771435b, 0x8265da3d39d1a750, 0xff4af3ab8d1b78c5,
+ 0xf0ec5f424bcad77f, 0x66e455f627495189, 0xc82d3120b57e3270,
+ 0x3424e47dc22596e3, 0xbc0c95129ccedcdd, 0xc191c595afc4dcbf,
+ 0x120392bd2bb70939, 0x7f90650ea6cd6ab4, 0x7287491832695ad3,
+ 0xa7c8fac5a7917eb0, 0xd088cb9418be0361, 0x7c1bf9839c7c1ce5,
+ 0xe2e991fa58e1e79e, 0x78565cdefd28c4ad, 0x7351b9fef98bafad,
+ 0x2a9eac28b08c96bf, 0x6c4f179696cb2225, 0x13a685861bab87e0,
+ 0x64c6de5aa0501971, 0x30537425cac70991, 0x01590d9dc6c532b7,
+ 0x7e05e3aa8ec720dc, 0x74a07d9c54e3e63f, 0x738184388f3bc1d2,
+ 0x26ffdc5067be3acb, 0x6bcdf185561f255f, 0xa0eaf2e1cf99b1c6,
+ 0x171df81934f68604, 0x7ea5a21665683e5a, 0x5d1cb02075ba1cea,
+ 0x957f38cbd2123fdf, 0xba6364eff80de02f, 0x606e0a0e41d452ee,
+ 0x892d8317de82f7a2, 0xe707b1db50f7b43e, 0x4eb28826766fcf5b,
+ 0x5a362d56e80a0951, 0x6ee217df16527d78, 0xf6737962ba6b23dd,
+ 0x443e63857d4076ca, 0x790d9a5f048adfeb, 0xd796b052151ee94d,
+ 0x033ed95c12b04a03, 0x8b833ff84893da5d, 0x3d6724b1bb15eab9,
+ 0x9877c4225061ca76, 0xd68d6810adf74fb3, 0x42e5352fe30ce989,
+ 0x265b565a7431fde7, 0x3cdbf7e358df4b8b, 0x2922a47f6d3e8779,
+ 0x52d2242f65b37f88, 0x5d836d6e2958d6b5, 0x29d40f00566d5e26,
+ 0x288db0e1124b14a0, 0x6c056608b7d9c1b6, 0x0b9471bdb8f19d32,
+ 0x8fb946504faa6c9d, 0x8943a9464540251c, 0xfd1fe27d144a09e0,
+ 0xea6ac458da141bda, 0x8048f217633fce36, 0xfeda1384ade74d31,
+ 0x4334b8b02ff7612f, 0xdbc8441f5227e216, 0x096d119a3605c85b,
+ 0x2b72b31c21b7d7d0};
+
+ randen_u64 engine;
+#if UPDATE_GOLDEN
+ (void)kGolden; // Silence warning.
+ for (size_t i = 0; i < kNumGoldenOutputs; ++i) {
+ printf("0x%016lx, ", engine());
+ if (i % 3 == 2) {
+ printf("\n");
+ }
+ }
+ printf("\n\n\n");
+#else
+ for (const auto& elem : kGolden) {
+ EXPECT_EQ(elem, engine());
+ }
+ engine.seed();
+ for (const auto& elem : kGolden) {
+ EXPECT_EQ(elem, engine());
+ }
+#endif
+}
+
+TEST(RandenTest, VerifyGoldenRanden64Seeded) {
+ constexpr uint64_t kGolden[kNumGoldenOutputs] = {
+ 0x83a9e58f94d3dcd5, 0x70bbdff3d97949fb, 0x0438481f7471c1b4,
+ 0x34fdc58ee5fb5930, 0xceee4f2d2a937d17, 0xb5a26a68e432aea9,
+ 0x8b64774a3fb51740, 0xd89ac1fc74249c74, 0x03910d1d23fc3fdf,
+ 0xd38f630878aa897f, 0x0ee8f0f5615f7e44, 0x98f5a53df8279d52,
+ 0xb403f52c25938d0e, 0x240072996ea6e838, 0xd3a791246190fa61,
+ 0xaaedd3df7a7b4f80, 0xc6eacabe05deaf6e, 0xb7967dd8790edf4d,
+ 0x9a0a8e67e049d279, 0x0494f606aebc23e7, 0x598dcd687bc3e0ee,
+ 0x010ac81802d452a1, 0x6407c87160aa2842, 0x5a56e276486f93a0,
+ 0xc887a399d46a8f02, 0x9e1e6100fe93b740, 0x12d02e330f8901f6,
+ 0xc39ca52b47e790b7, 0xb0b0a2fa11e82e61, 0x1542d841a303806a,
+ 0x1fe659fd7d6e9d86, 0xb8c90d80746541ac, 0x239d56a5669ddc94,
+ 0xd40db57c8123d13c, 0x3abc2414153a0db0, 0x9bad665630cb8d61,
+ 0x0bd1fb90ee3f4bbc, 0x8f0b4d7e079b4e42, 0xfa0fb0e0ee59e793,
+ 0x51080b283e071100, 0x2c4b9e715081cc15, 0xbe10ed49de4941df,
+ 0xf8eaac9d4b1b0d37, 0x4bcce4b54605e139, 0xa64722b76765dda6,
+ 0xb9377d738ca28ab5, 0x779fad81a8ccc1af, 0x65cb3ee61ffd3ba7,
+ 0xd74e79087862836f, 0xd05b9c584c3f25bf, 0x2ba93a4693579827,
+ 0xd81530aff05420ce, 0xec06cea215478621, 0x4b1798a6796d65ad,
+ 0xf142f3fb3a6f6fa6, 0x002b7bf7e237b560, 0xf47f2605ef65b4f8,
+ 0x9804ec5517effc18, 0xaed3d7f8b7d481cd, 0x5651c24c1ce338d1,
+ 0x3e7a38208bf0a3c6, 0x6796a7b614534aed, 0x0d0f3b848358460f,
+ 0x0fa5fe7600b19524, 0x2b0cf38253faaedc, 0x10df9188233a9fd6,
+ 0x3a10033880138b59, 0x5fb0b0d23948e80f, 0x9e76f7b02fbf5350,
+ 0x0816052304b1a985, 0x30c9880db41fd218, 0x14aa399b65e20f28,
+ 0xe1454a8cace787b4, 0x325ac971b6c6f0f5, 0x716b1aa2784f3d36,
+ 0x3d5ce14accfd144f, 0x6c0c97710f651792, 0xbc5b0f59fb333532,
+ 0x2a90a7d2140470bc, 0x8da269f55c1e1c8d, 0xcfc37143895792ca,
+ 0xbe21eab1f30b238f, 0x8c47229dee4d65fd, 0x5743614ed1ed7d54,
+ 0x351372a99e9c476e, 0x2bd5ea15e5db085f, 0x6925fde46e0af4ca,
+ 0xed3eda2bdc1f45bd, 0xdef68c68d460fa6e, 0xe42a0de76253e2b5,
+ 0x4e5176dcbc29c305, 0xbfd85fba9f810f6e, 0x76a5a2a9beb815c6,
+ 0x01edc4ddceaf414c, 0xa4e98904b4bb3b4b, 0x00bd63ac7d2f1ddd,
+ 0xb8491fe6e998ddbb, 0xb386a3463dda6800, 0x0081887688871619,
+ 0x33d394b3344e9a38, 0x815dba65a3a8baf9, 0x4232f6ec02c2fd1a,
+ 0xb5cff603edd20834, 0x580189243f687663, 0xa8d5a2cbdc27fe99,
+ 0x725d881693fa0131, 0xa2be2c13db2c7ac5, 0x7b6a9614b509fd78,
+ 0xb6b136d71e717636, 0x660f1a71aff046ea, 0x0ba10ae346c8ec9e,
+ 0xe66dde53e3145b41, 0x3b18288c88c26be6, 0x4d9d9d2ff02db933,
+ 0x4167da8c70f46e8a, 0xf183beef8c6318b4, 0x4d889e1e71eeeef1,
+ 0x7175c71ad6689b6b, 0xfb9e42beacd1b7dd, 0xc33d0e91b29b5e0d,
+ 0xd39b83291ce47922, 0xc4d570fb8493d12e, 0x23d5a5724f424ae6,
+ 0x5245f161876b6616, 0x38d77dbd21ab578d, 0x9c3423311f4ecbfe,
+ 0x76fe31389bacd9d5,
+ };
+
+ ExplicitSeedSeq seed_sequence{12, 34, 56};
+ randen_u64 engine(seed_sequence);
+#if UPDATE_GOLDEN
+ (void)kGolden; // Silence warning.
+ for (size_t i = 0; i < kNumGoldenOutputs; ++i) {
+ printf("0x%016lx, ", engine());
+ if (i % 3 == 2) {
+ printf("\n");
+ }
+ }
+ printf("\n\n\n");
+#else
+ for (const auto& elem : kGolden) {
+ EXPECT_EQ(elem, engine());
+ }
+ engine.seed(seed_sequence);
+ for (const auto& elem : kGolden) {
+ EXPECT_EQ(elem, engine());
+ }
+#endif
+}
+
+TEST(RandenTest, VerifyGoldenRanden32Default) {
+ constexpr uint64_t kGolden[2 * kNumGoldenOutputs] = {
+ 0x4e433977, 0xc3c14f13, 0xd90410ee, 0xdda9f47c, 0x7fd8ca10, 0x887bf308,
+ 0x45c72912, 0xf0b780f5, 0x7696599f, 0x15dbb1d3, 0xff3c6d59, 0x30ec63ba,
+ 0x6f7f20a6, 0xb29f7360, 0x6f49a54c, 0x02808a31, 0xd5c8e50e, 0x3b8feaf9,
+ 0x3fd9de8a, 0x9cbf605e, 0x78183bbb, 0xc970ae1a, 0x56301ed5, 0xd8b2ffd3,
+ 0x0fc73c37, 0xf4b327fe, 0xeb8f9a19, 0xcdfd8d76, 0x91420c9d, 0xc3a506eb,
+ 0x3eff9556, 0xd5af05dd, 0x8f83c4a1, 0x48db1bb7, 0x0d6bfe8c, 0x7023920e,
+ 0x34956d42, 0x58d35758, 0x6b87b840, 0xed1ef4c2, 0x3e0b2df3, 0x8eef32a2,
+ 0x431154fc, 0x497cabf3, 0x70029a8b, 0x4e243705, 0xf090e5ea, 0xd88b5749,
+ 0xa970692f, 0xc651a582, 0xbb6342f5, 0x78fcec2c, 0x612f55db, 0x463cb745,
+ 0x1816afe3, 0x352ee4ad, 0xc101da7e, 0x026ff374, 0x1c3de851, 0x811ef082,
+ 0x04c4fa59, 0x6f7e6167, 0x992d58fc, 0xa0660379, 0xa3b795c7, 0x04b0a374,
+ 0x685da798, 0x915f3445, 0xc76571ce, 0x26802a8a, 0x33ce1882, 0x46633525,
+ 0xa24dc738, 0xb9fdefb4, 0x4d6e6c51, 0x5588ba3a, 0xd35f1956, 0xa2101a42,
+ 0xe200f5fd, 0x607195a5, 0xf3290764, 0x7e100308, 0x759c0709, 0xe1e5e03c,
+ 0x5da6606f, 0x082572cc, 0x99e432f1, 0xcbcf5853, 0x8335d8f1, 0xe8a2be4f,
+ 0xcbfee8f2, 0x0904469a, 0x6daecd51, 0xf08bd31b, 0xa69da69a, 0x08e8a1f1,
+ 0xad57bff5, 0x6542a20a, 0x053d6b46, 0x2e9705bb, 0x0713c391, 0xda2fc9db,
+ 0x213b6ffb, 0x78e3a810, 0xdd85f8a6, 0xdc16a59c, 0xcd55781f, 0xc0932718,
+ 0x2b20bfe5, 0xb9bfb29c, 0xbe0f2f9c, 0xb97289c1, 0x03a892d4, 0xc0a2a0e4,
+ 0x4771435b, 0x5524bb83, 0x39d1a750, 0x8265da3d, 0x8d1b78c5, 0xff4af3ab,
+ 0x4bcad77f, 0xf0ec5f42, 0x27495189, 0x66e455f6, 0xb57e3270, 0xc82d3120,
+ 0xc22596e3, 0x3424e47d, 0x9ccedcdd, 0xbc0c9512, 0xafc4dcbf, 0xc191c595,
+ 0x2bb70939, 0x120392bd, 0xa6cd6ab4, 0x7f90650e, 0x32695ad3, 0x72874918,
+ 0xa7917eb0, 0xa7c8fac5, 0x18be0361, 0xd088cb94, 0x9c7c1ce5, 0x7c1bf983,
+ 0x58e1e79e, 0xe2e991fa, 0xfd28c4ad, 0x78565cde, 0xf98bafad, 0x7351b9fe,
+ 0xb08c96bf, 0x2a9eac28, 0x96cb2225, 0x6c4f1796, 0x1bab87e0, 0x13a68586,
+ 0xa0501971, 0x64c6de5a, 0xcac70991, 0x30537425, 0xc6c532b7, 0x01590d9d,
+ 0x8ec720dc, 0x7e05e3aa, 0x54e3e63f, 0x74a07d9c, 0x8f3bc1d2, 0x73818438,
+ 0x67be3acb, 0x26ffdc50, 0x561f255f, 0x6bcdf185, 0xcf99b1c6, 0xa0eaf2e1,
+ 0x34f68604, 0x171df819, 0x65683e5a, 0x7ea5a216, 0x75ba1cea, 0x5d1cb020,
+ 0xd2123fdf, 0x957f38cb, 0xf80de02f, 0xba6364ef, 0x41d452ee, 0x606e0a0e,
+ 0xde82f7a2, 0x892d8317, 0x50f7b43e, 0xe707b1db, 0x766fcf5b, 0x4eb28826,
+ 0xe80a0951, 0x5a362d56, 0x16527d78, 0x6ee217df, 0xba6b23dd, 0xf6737962,
+ 0x7d4076ca, 0x443e6385, 0x048adfeb, 0x790d9a5f, 0x151ee94d, 0xd796b052,
+ 0x12b04a03, 0x033ed95c, 0x4893da5d, 0x8b833ff8, 0xbb15eab9, 0x3d6724b1,
+ 0x5061ca76, 0x9877c422, 0xadf74fb3, 0xd68d6810, 0xe30ce989, 0x42e5352f,
+ 0x7431fde7, 0x265b565a, 0x58df4b8b, 0x3cdbf7e3, 0x6d3e8779, 0x2922a47f,
+ 0x65b37f88, 0x52d2242f, 0x2958d6b5, 0x5d836d6e, 0x566d5e26, 0x29d40f00,
+ 0x124b14a0, 0x288db0e1, 0xb7d9c1b6, 0x6c056608, 0xb8f19d32, 0x0b9471bd,
+ 0x4faa6c9d, 0x8fb94650, 0x4540251c, 0x8943a946, 0x144a09e0, 0xfd1fe27d,
+ 0xda141bda, 0xea6ac458, 0x633fce36, 0x8048f217, 0xade74d31, 0xfeda1384,
+ 0x2ff7612f, 0x4334b8b0, 0x5227e216, 0xdbc8441f, 0x3605c85b, 0x096d119a,
+ 0x21b7d7d0, 0x2b72b31c};
+
+ randen_u32 engine;
+#if UPDATE_GOLDEN
+ (void)kGolden; // Silence warning.
+ for (size_t i = 0; i < 2 * kNumGoldenOutputs; ++i) {
+ printf("0x%08x, ", engine());
+ if (i % 6 == 5) {
+ printf("\n");
+ }
+ }
+ printf("\n\n\n");
+#else
+ for (const auto& elem : kGolden) {
+ EXPECT_EQ(elem, engine());
+ }
+ engine.seed();
+ for (const auto& elem : kGolden) {
+ EXPECT_EQ(elem, engine());
+ }
+#endif
+}
+
+TEST(RandenTest, VerifyGoldenRanden32Seeded) {
+ constexpr uint64_t kGolden[2 * kNumGoldenOutputs] = {
+ 0x94d3dcd5, 0x83a9e58f, 0xd97949fb, 0x70bbdff3, 0x7471c1b4, 0x0438481f,
+ 0xe5fb5930, 0x34fdc58e, 0x2a937d17, 0xceee4f2d, 0xe432aea9, 0xb5a26a68,
+ 0x3fb51740, 0x8b64774a, 0x74249c74, 0xd89ac1fc, 0x23fc3fdf, 0x03910d1d,
+ 0x78aa897f, 0xd38f6308, 0x615f7e44, 0x0ee8f0f5, 0xf8279d52, 0x98f5a53d,
+ 0x25938d0e, 0xb403f52c, 0x6ea6e838, 0x24007299, 0x6190fa61, 0xd3a79124,
+ 0x7a7b4f80, 0xaaedd3df, 0x05deaf6e, 0xc6eacabe, 0x790edf4d, 0xb7967dd8,
+ 0xe049d279, 0x9a0a8e67, 0xaebc23e7, 0x0494f606, 0x7bc3e0ee, 0x598dcd68,
+ 0x02d452a1, 0x010ac818, 0x60aa2842, 0x6407c871, 0x486f93a0, 0x5a56e276,
+ 0xd46a8f02, 0xc887a399, 0xfe93b740, 0x9e1e6100, 0x0f8901f6, 0x12d02e33,
+ 0x47e790b7, 0xc39ca52b, 0x11e82e61, 0xb0b0a2fa, 0xa303806a, 0x1542d841,
+ 0x7d6e9d86, 0x1fe659fd, 0x746541ac, 0xb8c90d80, 0x669ddc94, 0x239d56a5,
+ 0x8123d13c, 0xd40db57c, 0x153a0db0, 0x3abc2414, 0x30cb8d61, 0x9bad6656,
+ 0xee3f4bbc, 0x0bd1fb90, 0x079b4e42, 0x8f0b4d7e, 0xee59e793, 0xfa0fb0e0,
+ 0x3e071100, 0x51080b28, 0x5081cc15, 0x2c4b9e71, 0xde4941df, 0xbe10ed49,
+ 0x4b1b0d37, 0xf8eaac9d, 0x4605e139, 0x4bcce4b5, 0x6765dda6, 0xa64722b7,
+ 0x8ca28ab5, 0xb9377d73, 0xa8ccc1af, 0x779fad81, 0x1ffd3ba7, 0x65cb3ee6,
+ 0x7862836f, 0xd74e7908, 0x4c3f25bf, 0xd05b9c58, 0x93579827, 0x2ba93a46,
+ 0xf05420ce, 0xd81530af, 0x15478621, 0xec06cea2, 0x796d65ad, 0x4b1798a6,
+ 0x3a6f6fa6, 0xf142f3fb, 0xe237b560, 0x002b7bf7, 0xef65b4f8, 0xf47f2605,
+ 0x17effc18, 0x9804ec55, 0xb7d481cd, 0xaed3d7f8, 0x1ce338d1, 0x5651c24c,
+ 0x8bf0a3c6, 0x3e7a3820, 0x14534aed, 0x6796a7b6, 0x8358460f, 0x0d0f3b84,
+ 0x00b19524, 0x0fa5fe76, 0x53faaedc, 0x2b0cf382, 0x233a9fd6, 0x10df9188,
+ 0x80138b59, 0x3a100338, 0x3948e80f, 0x5fb0b0d2, 0x2fbf5350, 0x9e76f7b0,
+ 0x04b1a985, 0x08160523, 0xb41fd218, 0x30c9880d, 0x65e20f28, 0x14aa399b,
+ 0xace787b4, 0xe1454a8c, 0xb6c6f0f5, 0x325ac971, 0x784f3d36, 0x716b1aa2,
+ 0xccfd144f, 0x3d5ce14a, 0x0f651792, 0x6c0c9771, 0xfb333532, 0xbc5b0f59,
+ 0x140470bc, 0x2a90a7d2, 0x5c1e1c8d, 0x8da269f5, 0x895792ca, 0xcfc37143,
+ 0xf30b238f, 0xbe21eab1, 0xee4d65fd, 0x8c47229d, 0xd1ed7d54, 0x5743614e,
+ 0x9e9c476e, 0x351372a9, 0xe5db085f, 0x2bd5ea15, 0x6e0af4ca, 0x6925fde4,
+ 0xdc1f45bd, 0xed3eda2b, 0xd460fa6e, 0xdef68c68, 0x6253e2b5, 0xe42a0de7,
+ 0xbc29c305, 0x4e5176dc, 0x9f810f6e, 0xbfd85fba, 0xbeb815c6, 0x76a5a2a9,
+ 0xceaf414c, 0x01edc4dd, 0xb4bb3b4b, 0xa4e98904, 0x7d2f1ddd, 0x00bd63ac,
+ 0xe998ddbb, 0xb8491fe6, 0x3dda6800, 0xb386a346, 0x88871619, 0x00818876,
+ 0x344e9a38, 0x33d394b3, 0xa3a8baf9, 0x815dba65, 0x02c2fd1a, 0x4232f6ec,
+ 0xedd20834, 0xb5cff603, 0x3f687663, 0x58018924, 0xdc27fe99, 0xa8d5a2cb,
+ 0x93fa0131, 0x725d8816, 0xdb2c7ac5, 0xa2be2c13, 0xb509fd78, 0x7b6a9614,
+ 0x1e717636, 0xb6b136d7, 0xaff046ea, 0x660f1a71, 0x46c8ec9e, 0x0ba10ae3,
+ 0xe3145b41, 0xe66dde53, 0x88c26be6, 0x3b18288c, 0xf02db933, 0x4d9d9d2f,
+ 0x70f46e8a, 0x4167da8c, 0x8c6318b4, 0xf183beef, 0x71eeeef1, 0x4d889e1e,
+ 0xd6689b6b, 0x7175c71a, 0xacd1b7dd, 0xfb9e42be, 0xb29b5e0d, 0xc33d0e91,
+ 0x1ce47922, 0xd39b8329, 0x8493d12e, 0xc4d570fb, 0x4f424ae6, 0x23d5a572,
+ 0x876b6616, 0x5245f161, 0x21ab578d, 0x38d77dbd, 0x1f4ecbfe, 0x9c342331,
+ 0x9bacd9d5, 0x76fe3138,
+ };
+
+ ExplicitSeedSeq seed_sequence{12, 34, 56};
+ randen_u32 engine(seed_sequence);
+#if UPDATE_GOLDEN
+ (void)kGolden; // Silence warning.
+ for (size_t i = 0; i < 2 * kNumGoldenOutputs; ++i) {
+ printf("0x%08x, ", engine());
+ if (i % 6 == 5) {
+ printf("\n");
+ }
+ }
+ printf("\n\n\n");
+#else
+ for (const auto& elem : kGolden) {
+ EXPECT_EQ(elem, engine());
+ }
+ engine.seed(seed_sequence);
+ for (const auto& elem : kGolden) {
+ EXPECT_EQ(elem, engine());
+ }
+#endif
+}
+
+TEST(RandenTest, VerifyGoldenFromDeserializedEngine) {
+ constexpr uint64_t kGolden[kNumGoldenOutputs] = {
+ 0x067f9f9ab919657a, 0x0534605912988583, 0x8a303f72feaa673f,
+ 0x77b7fd747909185c, 0xd9af90403c56d891, 0xd939c6cb204d14b5,
+ 0x7fbe6b954a47b483, 0x8b31a47cc34c768d, 0x3a9e546da2701a9c,
+ 0x5246539046253e71, 0x417191ffb2a848a1, 0x7b1c7bf5a5001d09,
+ 0x9489b15d194f2361, 0xfcebdeea3bcd2461, 0xd643027c854cec97,
+ 0x5885397f91e0d21c, 0x53173b0efae30d58, 0x1c9c71168449fac1,
+ 0xe358202b711ed8aa, 0x94e3918ed1d8227c, 0x5bb4e251450144cf,
+ 0xb5c7a519b489af3b, 0x6f8b560b1f7b3469, 0xfde11dd4a1c74eef,
+ 0x33383d2f76457dcf, 0x3060c0ec6db9fce1, 0x18f451fcddeec766,
+ 0xe73c5d6b9f26da2a, 0x8d4cc566671b32a4, 0xb8189b73776bc9ff,
+ 0x497a70f9caf0bc23, 0x23afcc509791dcea, 0x18af70dc4b27d306,
+ 0xd3853f955a0ce5b9, 0x441db6c01a0afb17, 0xd0136c3fb8e1f13f,
+ 0x5e4fd6fc2f33783c, 0xe0d24548adb5da51, 0x0f4d8362a7d3485a,
+ 0x9f572d68270fa563, 0x6351fbc823024393, 0xa66dbfc61810e9ab,
+ 0x0ff17fc14b651af8, 0xd74c55dafb99e623, 0x36303bc1ad85c6c2,
+ 0x4920cd6a2af7e897, 0x0b8848addc30fecd, 0x9e1562eda6488e93,
+ 0x197553807d607828, 0xbef5eaeda5e21235, 0x18d91d2616aca527,
+ 0xb7821937f5c873cd, 0x2cd4ae5650dbeefc, 0xb35a64376f75ffdf,
+ 0x9226d414d647fe07, 0x663f3db455bbb35e, 0xa829eead6ae93247,
+ 0x7fd69c204dd0d25f, 0xbe1411f891c9acb1, 0xd476f34a506d5f11,
+ 0xf423d2831649c5ca, 0x1e503962951abd75, 0xeccc9e8b1e34b537,
+ 0xb11a147294044854, 0xc4cf27f0abf4929d, 0xe9193abf6fa24c8c,
+ 0xa94a259e3aba8808, 0x21dc414197deffa3, 0xa2ae211d1ff622ae,
+ 0xfe3995c46be5a4f4, 0xe9984c284bf11128, 0xcb1ce9d2f0851a80,
+ 0x42fee17971d87cd8, 0xac76a98d177adc88, 0xa0973b3dedc4af6f,
+ 0xdf56d6bbcb1b8e86, 0xf1e6485f407b11c9, 0x2c63de4deccb15c0,
+ 0x6fe69db32ed4fad7, 0xaa51a65f84bca1f1, 0x242f2ee81d608afc,
+ 0x8eb88b2b69fc153b, 0x22c20098baf73fd1, 0x57759466f576488c,
+ 0x075ca562cea1be9d, 0x9a74814d73d28891, 0x73d1555fc02f4d3d,
+ 0xc17f8f210ee89337, 0x46cca7999eaeafd4, 0x5db8d6a327a0d8ac,
+ 0xb79b4f93c738d7a1, 0x9994512f0036ded1, 0xd3883026f38747f4,
+ 0xf31f7458078d097c, 0x736ce4d480680669, 0x7a496f4c7e1033e3,
+ 0xecf85bf297fbc68c, 0x9e37e1d0f24f3c4e, 0x15b6e067ca0746fc,
+ 0xdd4a39905c5db81c, 0xb5dfafa7bcfdf7da, 0xca6646fb6f92a276,
+ 0x1c6b35f363ef0efd, 0x6a33d06037ad9f76, 0x45544241afd8f80f,
+ 0x83f8d83f859c90c5, 0x22aea9c5365e8c19, 0xfac35b11f20b6a6a,
+ 0xd1acf49d1a27dd2f, 0xf281cd09c4fed405, 0x076000a42cd38e4f,
+ 0x6ace300565070445, 0x463a62781bddc4db, 0x1477126b46b569ac,
+ 0x127f2bb15035fbb8, 0xdfa30946049c04a8, 0x89072a586ba8dd3e,
+ 0x62c809582bb7e74d, 0x22c0c3641406c28b, 0x9b66e36c47ff004d,
+ 0xb9cd2c7519653330, 0x18608d79cd7a598d, 0x92c0bd1323e53e32,
+ 0x887ff00de8524aa5, 0xa074410b787abd10, 0x18ab41b8057a2063,
+ 0x1560abf26bc5f987};
+
+#if UPDATE_GOLDEN
+ (void)kGolden; // Silence warning.
+ std::seed_seq seed_sequence{1, 2, 3, 4, 5};
+ randen_u64 engine(seed_sequence);
+ std::ostringstream stream;
+ stream << engine;
+ auto str = stream.str();
+ printf("%s\n\n", str.c_str());
+ for (size_t i = 0; i < kNumGoldenOutputs; ++i) {
+ printf("0x%016lx, ", engine());
+ if (i % 3 == 2) {
+ printf("\n");
+ }
+ }
+ printf("\n\n\n");
+#else
+ randen_u64 engine;
+ std::istringstream stream(
+ "0 0 9824501439887287479 3242284395352394785 243836530774933777 "
+ "4047941804708365596 17165468127298385802 949276103645889255 "
+ "10659970394998657921 1657570836810929787 11697746266668051452 "
+ "9967209969299905230 14140390331161524430 7383014124183271684 "
+ "13146719127702337852 13983155220295807171 11121125587542359264 "
+ "195757810993252695 17138580243103178492 11326030747260920501 "
+ "8585097322474965590 18342582839328350995 15052982824209724634 "
+ "7321861343874683609 1806786911778767826 10100850842665572955 "
+ "9249328950653985078 13600624835326909759 11137960060943860251 "
+ "10208781341792329629 9282723971471525577 16373271619486811032 32");
+ stream >> engine;
+ for (const auto& elem : kGolden) {
+ EXPECT_EQ(elem, engine());
+ }
+#endif
+}
+
+TEST(RandenTest, IsFastOrSlow) {
+ // randen_engine typically costs ~5ns per value for the optimized code paths,
+ // and the ~1000ns per value for slow code paths. However when running under
+ // msan, asan, etc. it can take much longer.
+ //
+ // The estimated operation time is something like:
+ //
+ // linux, optimized ~5ns
+ // ppc, optimized ~7ns
+ // nacl (slow), ~1100ns
+ //
+ // `kCount` is chosen below so that, in debug builds and without hardware
+ // acceleration, the test (assuming ~1us per call) should finish in ~0.1s
+ static constexpr size_t kCount = 100000;
+ randen_u64 engine;
+ randen_u64::result_type sum = 0;
+ auto start = absl::GetCurrentTimeNanos();
+ for (int i = 0; i < kCount; i++) {
+ sum += engine();
+ }
+ auto duration = absl::GetCurrentTimeNanos() - start;
+
+ ABSL_INTERNAL_LOG(INFO, absl::StrCat(static_cast<double>(duration) /
+ static_cast<double>(kCount),
+ "ns"));
+
+ EXPECT_GT(sum, 0);
+ EXPECT_GE(duration, kCount); // Should be slower than 1ns per call.
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/random/internal/randen_hwaes.cc b/third_party/abseil/src/absl/random/internal/randen_hwaes.cc
new file mode 100644
index 0000000..b5a3f90
--- /dev/null
+++ b/third_party/abseil/src/absl/random/internal/randen_hwaes.cc
@@ -0,0 +1,573 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// HERMETIC NOTE: The randen_hwaes target must not introduce duplicate
+// symbols from arbitrary system and other headers, since it may be built
+// with different flags from other targets, using different levels of
+// optimization, potentially introducing ODR violations.
+
+#include "absl/random/internal/randen_hwaes.h"
+
+#include <cstdint>
+#include <cstring>
+
+#include "absl/base/attributes.h"
+#include "absl/random/internal/platform.h"
+#include "absl/random/internal/randen_traits.h"
+
+// ABSL_RANDEN_HWAES_IMPL indicates whether this file will contain
+// a hardware accelerated implementation of randen, or whether it
+// will contain stubs that exit the process.
+#if defined(ABSL_ARCH_X86_64) || defined(ABSL_ARCH_X86_32)
+// The platform.h directives are sufficient to indicate whether
+// we should build accelerated implementations for x86.
+#if (ABSL_HAVE_ACCELERATED_AES || ABSL_RANDOM_INTERNAL_AES_DISPATCH)
+#define ABSL_RANDEN_HWAES_IMPL 1
+#endif
+#elif defined(ABSL_ARCH_PPC)
+// The platform.h directives are sufficient to indicate whether
+// we should build accelerated implementations for PPC.
+//
+// NOTE: This has mostly been tested on 64-bit Power variants,
+// and not embedded cpus such as powerpc32-8540
+#if ABSL_HAVE_ACCELERATED_AES
+#define ABSL_RANDEN_HWAES_IMPL 1
+#endif
+#elif defined(ABSL_ARCH_ARM) || defined(ABSL_ARCH_AARCH64)
+// ARM is somewhat more complicated. We might support crypto natively...
+#if ABSL_HAVE_ACCELERATED_AES || \
+ (defined(__ARM_NEON) && defined(__ARM_FEATURE_CRYPTO))
+#define ABSL_RANDEN_HWAES_IMPL 1
+
+#elif ABSL_RANDOM_INTERNAL_AES_DISPATCH && !defined(__APPLE__) && \
+ (defined(__GNUC__) && __GNUC__ > 4 || __GNUC__ == 4 && __GNUC_MINOR__ > 9)
+// ...or, on GCC, we can use an ASM directive to
+// instruct the assember to allow crypto instructions.
+#define ABSL_RANDEN_HWAES_IMPL 1
+#define ABSL_RANDEN_HWAES_IMPL_CRYPTO_DIRECTIVE 1
+#endif
+#else
+// HWAES is unsupported by these architectures / platforms:
+// __myriad2__
+// __mips__
+//
+// Other architectures / platforms are unknown.
+//
+// See the Abseil documentation on supported macros at:
+// https://abseil.io/docs/cpp/platforms/macros
+#endif
+
+#if !defined(ABSL_RANDEN_HWAES_IMPL)
+// No accelerated implementation is supported.
+// The RandenHwAes functions are stubs that print an error and exit.
+
+#include <cstdio>
+#include <cstdlib>
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace random_internal {
+
+// No accelerated implementation.
+bool HasRandenHwAesImplementation() { return false; }
+
+// NOLINTNEXTLINE
+const void* RandenHwAes::GetKeys() {
+ // Attempted to dispatch to an unsupported dispatch target.
+ const int d = ABSL_RANDOM_INTERNAL_AES_DISPATCH;
+ fprintf(stderr, "AES Hardware detection failed (%d).\n", d);
+ exit(1);
+ return nullptr;
+}
+
+// NOLINTNEXTLINE
+void RandenHwAes::Absorb(const void*, void*) {
+ // Attempted to dispatch to an unsupported dispatch target.
+ const int d = ABSL_RANDOM_INTERNAL_AES_DISPATCH;
+ fprintf(stderr, "AES Hardware detection failed (%d).\n", d);
+ exit(1);
+}
+
+// NOLINTNEXTLINE
+void RandenHwAes::Generate(const void*, void*) {
+ // Attempted to dispatch to an unsupported dispatch target.
+ const int d = ABSL_RANDOM_INTERNAL_AES_DISPATCH;
+ fprintf(stderr, "AES Hardware detection failed (%d).\n", d);
+ exit(1);
+}
+
+} // namespace random_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#else // defined(ABSL_RANDEN_HWAES_IMPL)
+//
+// Accelerated implementations are supported.
+// We need the per-architecture includes and defines.
+//
+namespace {
+
+using absl::random_internal::RandenTraits;
+
+// Randen operates on 128-bit vectors.
+struct alignas(16) u64x2 {
+ uint64_t data[2];
+};
+
+} // namespace
+
+// TARGET_CRYPTO defines a crypto attribute for each architecture.
+//
+// NOTE: Evaluate whether we should eliminate ABSL_TARGET_CRYPTO.
+#if (defined(__clang__) || defined(__GNUC__))
+#if defined(ABSL_ARCH_X86_64) || defined(ABSL_ARCH_X86_32)
+#define ABSL_TARGET_CRYPTO __attribute__((target("aes")))
+#elif defined(ABSL_ARCH_PPC)
+#define ABSL_TARGET_CRYPTO __attribute__((target("crypto")))
+#else
+#define ABSL_TARGET_CRYPTO
+#endif
+#else
+#define ABSL_TARGET_CRYPTO
+#endif
+
+#if defined(ABSL_ARCH_PPC)
+// NOTE: Keep in mind that PPC can operate in little-endian or big-endian mode,
+// however the PPC altivec vector registers (and thus the AES instructions)
+// always operate in big-endian mode.
+
+#include <altivec.h>
+// <altivec.h> #defines vector __vector; in C++, this is bad form.
+#undef vector
+#undef bool
+
+// Rely on the PowerPC AltiVec vector operations for accelerated AES
+// instructions. GCC support of the PPC vector types is described in:
+// https://gcc.gnu.org/onlinedocs/gcc-4.9.0/gcc/PowerPC-AltiVec_002fVSX-Built-in-Functions.html
+//
+// Already provides operator^=.
+using Vector128 = __vector unsigned long long; // NOLINT(runtime/int)
+
+namespace {
+inline ABSL_TARGET_CRYPTO Vector128 ReverseBytes(const Vector128& v) {
+ // Reverses the bytes of the vector.
+ const __vector unsigned char perm = {15, 14, 13, 12, 11, 10, 9, 8,
+ 7, 6, 5, 4, 3, 2, 1, 0};
+ return vec_perm(v, v, perm);
+}
+
+// WARNING: these load/store in native byte order. It is OK to load and then
+// store an unchanged vector, but interpreting the bits as a number or input
+// to AES will have undefined results.
+inline ABSL_TARGET_CRYPTO Vector128 Vector128Load(const void* from) {
+ return vec_vsx_ld(0, reinterpret_cast<const Vector128*>(from));
+}
+
+inline ABSL_TARGET_CRYPTO void Vector128Store(const Vector128& v, void* to) {
+ vec_vsx_st(v, 0, reinterpret_cast<Vector128*>(to));
+}
+
+// One round of AES. "round_key" is a public constant for breaking the
+// symmetry of AES (ensures previously equal columns differ afterwards).
+inline ABSL_TARGET_CRYPTO Vector128 AesRound(const Vector128& state,
+ const Vector128& round_key) {
+ return Vector128(__builtin_crypto_vcipher(state, round_key));
+}
+
+// Enables native loads in the round loop by pre-swapping.
+inline ABSL_TARGET_CRYPTO void SwapEndian(u64x2* state) {
+ for (uint32_t block = 0; block < RandenTraits::kFeistelBlocks; ++block) {
+ Vector128Store(ReverseBytes(Vector128Load(state + block)), state + block);
+ }
+}
+
+} // namespace
+
+#elif defined(ABSL_ARCH_ARM) || defined(ABSL_ARCH_AARCH64)
+
+// This asm directive will cause the file to be compiled with crypto extensions
+// whether or not the cpu-architecture supports it.
+#if ABSL_RANDEN_HWAES_IMPL_CRYPTO_DIRECTIVE
+asm(".arch_extension crypto\n");
+
+// Override missing defines.
+#if !defined(__ARM_NEON)
+#define __ARM_NEON 1
+#endif
+
+#if !defined(__ARM_FEATURE_CRYPTO)
+#define __ARM_FEATURE_CRYPTO 1
+#endif
+
+#endif
+
+// Rely on the ARM NEON+Crypto advanced simd types, defined in <arm_neon.h>.
+// uint8x16_t is the user alias for underlying __simd128_uint8_t type.
+// http://infocenter.arm.com/help/topic/com.arm.doc.ihi0073a/IHI0073A_arm_neon_intrinsics_ref.pdf
+//
+// <arm_neon> defines the following
+//
+// typedef __attribute__((neon_vector_type(16))) uint8_t uint8x16_t;
+// typedef __attribute__((neon_vector_type(16))) int8_t int8x16_t;
+// typedef __attribute__((neon_polyvector_type(16))) int8_t poly8x16_t;
+//
+// vld1q_v
+// vst1q_v
+// vaeseq_v
+// vaesmcq_v
+#include <arm_neon.h>
+
+// Already provides operator^=.
+using Vector128 = uint8x16_t;
+
+namespace {
+
+inline ABSL_TARGET_CRYPTO Vector128 Vector128Load(const void* from) {
+ return vld1q_u8(reinterpret_cast<const uint8_t*>(from));
+}
+
+inline ABSL_TARGET_CRYPTO void Vector128Store(const Vector128& v, void* to) {
+ vst1q_u8(reinterpret_cast<uint8_t*>(to), v);
+}
+
+// One round of AES. "round_key" is a public constant for breaking the
+// symmetry of AES (ensures previously equal columns differ afterwards).
+inline ABSL_TARGET_CRYPTO Vector128 AesRound(const Vector128& state,
+ const Vector128& round_key) {
+ // It is important to always use the full round function - omitting the
+ // final MixColumns reduces security [https://eprint.iacr.org/2010/041.pdf]
+ // and does not help because we never decrypt.
+ //
+ // Note that ARM divides AES instructions differently than x86 / PPC,
+ // And we need to skip the first AddRoundKey step and add an extra
+ // AddRoundKey step to the end. Lucky for us this is just XOR.
+ return vaesmcq_u8(vaeseq_u8(state, uint8x16_t{})) ^ round_key;
+}
+
+inline ABSL_TARGET_CRYPTO void SwapEndian(void*) {}
+
+} // namespace
+
+#elif defined(ABSL_ARCH_X86_64) || defined(ABSL_ARCH_X86_32)
+// On x86 we rely on the aesni instructions
+#include <wmmintrin.h>
+
+namespace {
+
+// Vector128 class is only wrapper for __m128i, benchmark indicates that it's
+// faster than using __m128i directly.
+class Vector128 {
+ public:
+ // Convert from/to intrinsics.
+ inline explicit Vector128(const __m128i& Vector128) : data_(Vector128) {}
+
+ inline __m128i data() const { return data_; }
+
+ inline Vector128& operator^=(const Vector128& other) {
+ data_ = _mm_xor_si128(data_, other.data());
+ return *this;
+ }
+
+ private:
+ __m128i data_;
+};
+
+inline ABSL_TARGET_CRYPTO Vector128 Vector128Load(const void* from) {
+ return Vector128(_mm_load_si128(reinterpret_cast<const __m128i*>(from)));
+}
+
+inline ABSL_TARGET_CRYPTO void Vector128Store(const Vector128& v, void* to) {
+ _mm_store_si128(reinterpret_cast<__m128i*>(to), v.data());
+}
+
+// One round of AES. "round_key" is a public constant for breaking the
+// symmetry of AES (ensures previously equal columns differ afterwards).
+inline ABSL_TARGET_CRYPTO Vector128 AesRound(const Vector128& state,
+ const Vector128& round_key) {
+ // It is important to always use the full round function - omitting the
+ // final MixColumns reduces security [https://eprint.iacr.org/2010/041.pdf]
+ // and does not help because we never decrypt.
+ return Vector128(_mm_aesenc_si128(state.data(), round_key.data()));
+}
+
+inline ABSL_TARGET_CRYPTO void SwapEndian(void*) {}
+
+} // namespace
+
+#endif
+
+#ifdef __clang__
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wunknown-pragmas"
+#endif
+
+// At this point, all of the platform-specific features have been defined /
+// implemented.
+//
+// REQUIRES: using Vector128 = ...
+// REQUIRES: Vector128 Vector128Load(void*) {...}
+// REQUIRES: void Vector128Store(Vector128, void*) {...}
+// REQUIRES: Vector128 AesRound(Vector128, Vector128) {...}
+// REQUIRES: void SwapEndian(uint64_t*) {...}
+//
+// PROVIDES: absl::random_internal::RandenHwAes::Absorb
+// PROVIDES: absl::random_internal::RandenHwAes::Generate
+namespace {
+
+// Block shuffles applies a shuffle to the entire state between AES rounds.
+// Improved odd-even shuffle from "New criterion for diffusion property".
+inline ABSL_TARGET_CRYPTO void BlockShuffle(u64x2* state) {
+ static_assert(RandenTraits::kFeistelBlocks == 16,
+ "Expecting 16 FeistelBlocks.");
+
+ constexpr size_t shuffle[RandenTraits::kFeistelBlocks] = {
+ 7, 2, 13, 4, 11, 8, 3, 6, 15, 0, 9, 10, 1, 14, 5, 12};
+
+ const Vector128 v0 = Vector128Load(state + shuffle[0]);
+ const Vector128 v1 = Vector128Load(state + shuffle[1]);
+ const Vector128 v2 = Vector128Load(state + shuffle[2]);
+ const Vector128 v3 = Vector128Load(state + shuffle[3]);
+ const Vector128 v4 = Vector128Load(state + shuffle[4]);
+ const Vector128 v5 = Vector128Load(state + shuffle[5]);
+ const Vector128 v6 = Vector128Load(state + shuffle[6]);
+ const Vector128 v7 = Vector128Load(state + shuffle[7]);
+ const Vector128 w0 = Vector128Load(state + shuffle[8]);
+ const Vector128 w1 = Vector128Load(state + shuffle[9]);
+ const Vector128 w2 = Vector128Load(state + shuffle[10]);
+ const Vector128 w3 = Vector128Load(state + shuffle[11]);
+ const Vector128 w4 = Vector128Load(state + shuffle[12]);
+ const Vector128 w5 = Vector128Load(state + shuffle[13]);
+ const Vector128 w6 = Vector128Load(state + shuffle[14]);
+ const Vector128 w7 = Vector128Load(state + shuffle[15]);
+
+ Vector128Store(v0, state + 0);
+ Vector128Store(v1, state + 1);
+ Vector128Store(v2, state + 2);
+ Vector128Store(v3, state + 3);
+ Vector128Store(v4, state + 4);
+ Vector128Store(v5, state + 5);
+ Vector128Store(v6, state + 6);
+ Vector128Store(v7, state + 7);
+ Vector128Store(w0, state + 8);
+ Vector128Store(w1, state + 9);
+ Vector128Store(w2, state + 10);
+ Vector128Store(w3, state + 11);
+ Vector128Store(w4, state + 12);
+ Vector128Store(w5, state + 13);
+ Vector128Store(w6, state + 14);
+ Vector128Store(w7, state + 15);
+}
+
+// Feistel round function using two AES subrounds. Very similar to F()
+// from Simpira v2, but with independent subround keys. Uses 17 AES rounds
+// per 16 bytes (vs. 10 for AES-CTR). Computing eight round functions in
+// parallel hides the 7-cycle AESNI latency on HSW. Note that the Feistel
+// XORs are 'free' (included in the second AES instruction).
+inline ABSL_TARGET_CRYPTO const u64x2* FeistelRound(
+ u64x2* state, const u64x2* ABSL_RANDOM_INTERNAL_RESTRICT keys) {
+ static_assert(RandenTraits::kFeistelBlocks == 16,
+ "Expecting 16 FeistelBlocks.");
+
+ // MSVC does a horrible job at unrolling loops.
+ // So we unroll the loop by hand to improve the performance.
+ const Vector128 s0 = Vector128Load(state + 0);
+ const Vector128 s1 = Vector128Load(state + 1);
+ const Vector128 s2 = Vector128Load(state + 2);
+ const Vector128 s3 = Vector128Load(state + 3);
+ const Vector128 s4 = Vector128Load(state + 4);
+ const Vector128 s5 = Vector128Load(state + 5);
+ const Vector128 s6 = Vector128Load(state + 6);
+ const Vector128 s7 = Vector128Load(state + 7);
+ const Vector128 s8 = Vector128Load(state + 8);
+ const Vector128 s9 = Vector128Load(state + 9);
+ const Vector128 s10 = Vector128Load(state + 10);
+ const Vector128 s11 = Vector128Load(state + 11);
+ const Vector128 s12 = Vector128Load(state + 12);
+ const Vector128 s13 = Vector128Load(state + 13);
+ const Vector128 s14 = Vector128Load(state + 14);
+ const Vector128 s15 = Vector128Load(state + 15);
+
+ // Encode even blocks with keys.
+ const Vector128 e0 = AesRound(s0, Vector128Load(keys + 0));
+ const Vector128 e2 = AesRound(s2, Vector128Load(keys + 1));
+ const Vector128 e4 = AesRound(s4, Vector128Load(keys + 2));
+ const Vector128 e6 = AesRound(s6, Vector128Load(keys + 3));
+ const Vector128 e8 = AesRound(s8, Vector128Load(keys + 4));
+ const Vector128 e10 = AesRound(s10, Vector128Load(keys + 5));
+ const Vector128 e12 = AesRound(s12, Vector128Load(keys + 6));
+ const Vector128 e14 = AesRound(s14, Vector128Load(keys + 7));
+
+ // Encode odd blocks with even output from above.
+ const Vector128 o1 = AesRound(e0, s1);
+ const Vector128 o3 = AesRound(e2, s3);
+ const Vector128 o5 = AesRound(e4, s5);
+ const Vector128 o7 = AesRound(e6, s7);
+ const Vector128 o9 = AesRound(e8, s9);
+ const Vector128 o11 = AesRound(e10, s11);
+ const Vector128 o13 = AesRound(e12, s13);
+ const Vector128 o15 = AesRound(e14, s15);
+
+ // Store odd blocks. (These will be shuffled later).
+ Vector128Store(o1, state + 1);
+ Vector128Store(o3, state + 3);
+ Vector128Store(o5, state + 5);
+ Vector128Store(o7, state + 7);
+ Vector128Store(o9, state + 9);
+ Vector128Store(o11, state + 11);
+ Vector128Store(o13, state + 13);
+ Vector128Store(o15, state + 15);
+
+ return keys + 8;
+}
+
+// Cryptographic permutation based via type-2 Generalized Feistel Network.
+// Indistinguishable from ideal by chosen-ciphertext adversaries using less than
+// 2^64 queries if the round function is a PRF. This is similar to the b=8 case
+// of Simpira v2, but more efficient than its generic construction for b=16.
+inline ABSL_TARGET_CRYPTO void Permute(
+ u64x2* state, const u64x2* ABSL_RANDOM_INTERNAL_RESTRICT keys) {
+ // (Successfully unrolled; the first iteration jumps into the second half)
+#ifdef __clang__
+#pragma clang loop unroll_count(2)
+#endif
+ for (size_t round = 0; round < RandenTraits::kFeistelRounds; ++round) {
+ keys = FeistelRound(state, keys);
+ BlockShuffle(state);
+ }
+}
+
+} // namespace
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace random_internal {
+
+bool HasRandenHwAesImplementation() { return true; }
+
+const void* ABSL_TARGET_CRYPTO RandenHwAes::GetKeys() {
+ // Round keys for one AES per Feistel round and branch.
+ // The canonical implementation uses first digits of Pi.
+#if defined(ABSL_ARCH_PPC)
+ return kRandenRoundKeysBE;
+#else
+ return kRandenRoundKeys;
+#endif
+}
+
+// NOLINTNEXTLINE
+void ABSL_TARGET_CRYPTO RandenHwAes::Absorb(const void* seed_void,
+ void* state_void) {
+ static_assert(RandenTraits::kCapacityBytes / sizeof(Vector128) == 1,
+ "Unexpected Randen kCapacityBlocks");
+ static_assert(RandenTraits::kStateBytes / sizeof(Vector128) == 16,
+ "Unexpected Randen kStateBlocks");
+
+ auto* state =
+ reinterpret_cast<u64x2 * ABSL_RANDOM_INTERNAL_RESTRICT>(state_void);
+ const auto* seed =
+ reinterpret_cast<const u64x2 * ABSL_RANDOM_INTERNAL_RESTRICT>(seed_void);
+
+ Vector128 b1 = Vector128Load(state + 1);
+ b1 ^= Vector128Load(seed + 0);
+ Vector128Store(b1, state + 1);
+
+ Vector128 b2 = Vector128Load(state + 2);
+ b2 ^= Vector128Load(seed + 1);
+ Vector128Store(b2, state + 2);
+
+ Vector128 b3 = Vector128Load(state + 3);
+ b3 ^= Vector128Load(seed + 2);
+ Vector128Store(b3, state + 3);
+
+ Vector128 b4 = Vector128Load(state + 4);
+ b4 ^= Vector128Load(seed + 3);
+ Vector128Store(b4, state + 4);
+
+ Vector128 b5 = Vector128Load(state + 5);
+ b5 ^= Vector128Load(seed + 4);
+ Vector128Store(b5, state + 5);
+
+ Vector128 b6 = Vector128Load(state + 6);
+ b6 ^= Vector128Load(seed + 5);
+ Vector128Store(b6, state + 6);
+
+ Vector128 b7 = Vector128Load(state + 7);
+ b7 ^= Vector128Load(seed + 6);
+ Vector128Store(b7, state + 7);
+
+ Vector128 b8 = Vector128Load(state + 8);
+ b8 ^= Vector128Load(seed + 7);
+ Vector128Store(b8, state + 8);
+
+ Vector128 b9 = Vector128Load(state + 9);
+ b9 ^= Vector128Load(seed + 8);
+ Vector128Store(b9, state + 9);
+
+ Vector128 b10 = Vector128Load(state + 10);
+ b10 ^= Vector128Load(seed + 9);
+ Vector128Store(b10, state + 10);
+
+ Vector128 b11 = Vector128Load(state + 11);
+ b11 ^= Vector128Load(seed + 10);
+ Vector128Store(b11, state + 11);
+
+ Vector128 b12 = Vector128Load(state + 12);
+ b12 ^= Vector128Load(seed + 11);
+ Vector128Store(b12, state + 12);
+
+ Vector128 b13 = Vector128Load(state + 13);
+ b13 ^= Vector128Load(seed + 12);
+ Vector128Store(b13, state + 13);
+
+ Vector128 b14 = Vector128Load(state + 14);
+ b14 ^= Vector128Load(seed + 13);
+ Vector128Store(b14, state + 14);
+
+ Vector128 b15 = Vector128Load(state + 15);
+ b15 ^= Vector128Load(seed + 14);
+ Vector128Store(b15, state + 15);
+}
+
+// NOLINTNEXTLINE
+void ABSL_TARGET_CRYPTO RandenHwAes::Generate(const void* keys_void,
+ void* state_void) {
+ static_assert(RandenTraits::kCapacityBytes == sizeof(Vector128),
+ "Capacity mismatch");
+
+ auto* state = reinterpret_cast<u64x2*>(state_void);
+ const auto* keys = reinterpret_cast<const u64x2*>(keys_void);
+
+ const Vector128 prev_inner = Vector128Load(state);
+
+ SwapEndian(state);
+
+ Permute(state, keys);
+
+ SwapEndian(state);
+
+ // Ensure backtracking resistance.
+ Vector128 inner = Vector128Load(state);
+ inner ^= prev_inner;
+ Vector128Store(inner, state);
+}
+
+#ifdef __clang__
+#pragma clang diagnostic pop
+#endif
+
+} // namespace random_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // (ABSL_RANDEN_HWAES_IMPL)
diff --git a/third_party/abseil/src/absl/random/internal/randen_hwaes.h b/third_party/abseil/src/absl/random/internal/randen_hwaes.h
new file mode 100644
index 0000000..bce36b5
--- /dev/null
+++ b/third_party/abseil/src/absl/random/internal/randen_hwaes.h
@@ -0,0 +1,50 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_RANDOM_INTERNAL_RANDEN_HWAES_H_
+#define ABSL_RANDOM_INTERNAL_RANDEN_HWAES_H_
+
+#include "absl/base/config.h"
+
+// HERMETIC NOTE: The randen_hwaes target must not introduce duplicate
+// symbols from arbitrary system and other headers, since it may be built
+// with different flags from other targets, using different levels of
+// optimization, potentially introducing ODR violations.
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace random_internal {
+
+// RANDen = RANDom generator or beetroots in Swiss German.
+// 'Strong' (well-distributed, unpredictable, backtracking-resistant) random
+// generator, faster in some benchmarks than std::mt19937_64 and pcg64_c32.
+//
+// RandenHwAes implements the basic state manipulation methods.
+class RandenHwAes {
+ public:
+ static void Generate(const void* keys, void* state_void);
+ static void Absorb(const void* seed_void, void* state_void);
+ static const void* GetKeys();
+};
+
+// HasRandenHwAesImplementation returns true when there is an accelerated
+// implementation, and false otherwise. If there is no implementation,
+// then attempting to use it will abort the program.
+bool HasRandenHwAesImplementation();
+
+} // namespace random_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_RANDOM_INTERNAL_RANDEN_HWAES_H_
diff --git a/third_party/abseil/src/absl/random/internal/randen_hwaes_test.cc b/third_party/abseil/src/absl/random/internal/randen_hwaes_test.cc
new file mode 100644
index 0000000..66ddb43
--- /dev/null
+++ b/third_party/abseil/src/absl/random/internal/randen_hwaes_test.cc
@@ -0,0 +1,104 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/random/internal/randen_hwaes.h"
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/base/internal/raw_logging.h"
+#include "absl/random/internal/platform.h"
+#include "absl/random/internal/randen_detect.h"
+#include "absl/random/internal/randen_traits.h"
+#include "absl/strings/str_format.h"
+
+namespace {
+
+using absl::random_internal::RandenHwAes;
+using absl::random_internal::RandenTraits;
+
+// Local state parameters.
+constexpr size_t kSeedBytes =
+ RandenTraits::kStateBytes - RandenTraits::kCapacityBytes;
+constexpr size_t kStateSizeT = RandenTraits::kStateBytes / sizeof(uint64_t);
+constexpr size_t kSeedSizeT = kSeedBytes / sizeof(uint32_t);
+
+struct alignas(16) randen {
+ uint64_t state[kStateSizeT];
+ uint32_t seed[kSeedSizeT];
+};
+
+TEST(RandenHwAesTest, Default) {
+ EXPECT_TRUE(absl::random_internal::CPUSupportsRandenHwAes());
+
+ constexpr uint64_t kGolden[] = {
+ 0x6c6534090ee6d3ee, 0x044e2b9b9d5333c6, 0xc3c14f134e433977,
+ 0xdda9f47cd90410ee, 0x887bf3087fd8ca10, 0xf0b780f545c72912,
+ 0x15dbb1d37696599f, 0x30ec63baff3c6d59, 0xb29f73606f7f20a6,
+ 0x02808a316f49a54c, 0x3b8feaf9d5c8e50e, 0x9cbf605e3fd9de8a,
+ 0xc970ae1a78183bbb, 0xd8b2ffd356301ed5, 0xf4b327fe0fc73c37,
+ 0xcdfd8d76eb8f9a19, 0xc3a506eb91420c9d, 0xd5af05dd3eff9556,
+ 0x48db1bb78f83c4a1, 0x7023920e0d6bfe8c, 0x58d3575834956d42,
+ 0xed1ef4c26b87b840, 0x8eef32a23e0b2df3, 0x497cabf3431154fc,
+ 0x4e24370570029a8b, 0xd88b5749f090e5ea, 0xc651a582a970692f,
+ 0x78fcec2cbb6342f5, 0x463cb745612f55db, 0x352ee4ad1816afe3,
+ 0x026ff374c101da7e, 0x811ef0821c3de851,
+ };
+
+ alignas(16) randen d;
+ memset(d.state, 0, sizeof(d.state));
+ RandenHwAes::Generate(RandenHwAes::GetKeys(), d.state);
+
+ uint64_t* id = d.state;
+ for (const auto& elem : kGolden) {
+ auto a = absl::StrFormat("%#x", elem);
+ auto b = absl::StrFormat("%#x", *id++);
+ EXPECT_EQ(a, b);
+ }
+}
+
+} // namespace
+
+int main(int argc, char* argv[]) {
+ testing::InitGoogleTest(&argc, argv);
+
+ ABSL_RAW_LOG(INFO, "ABSL_HAVE_ACCELERATED_AES=%d", ABSL_HAVE_ACCELERATED_AES);
+ ABSL_RAW_LOG(INFO, "ABSL_RANDOM_INTERNAL_AES_DISPATCH=%d",
+ ABSL_RANDOM_INTERNAL_AES_DISPATCH);
+
+#if defined(ABSL_ARCH_X86_64)
+ ABSL_RAW_LOG(INFO, "ABSL_ARCH_X86_64");
+#elif defined(ABSL_ARCH_X86_32)
+ ABSL_RAW_LOG(INFO, "ABSL_ARCH_X86_32");
+#elif defined(ABSL_ARCH_AARCH64)
+ ABSL_RAW_LOG(INFO, "ABSL_ARCH_AARCH64");
+#elif defined(ABSL_ARCH_ARM)
+ ABSL_RAW_LOG(INFO, "ABSL_ARCH_ARM");
+#elif defined(ABSL_ARCH_PPC)
+ ABSL_RAW_LOG(INFO, "ABSL_ARCH_PPC");
+#else
+ ABSL_RAW_LOG(INFO, "ARCH Unknown");
+#endif
+
+ int x = absl::random_internal::HasRandenHwAesImplementation();
+ ABSL_RAW_LOG(INFO, "HasRandenHwAesImplementation = %d", x);
+
+ int y = absl::random_internal::CPUSupportsRandenHwAes();
+ ABSL_RAW_LOG(INFO, "CPUSupportsRandenHwAes = %d", x);
+
+ if (!x || !y) {
+ ABSL_RAW_LOG(INFO, "Skipping Randen HWAES tests.");
+ return 0;
+ }
+ return RUN_ALL_TESTS();
+}
diff --git a/third_party/abseil/src/absl/random/internal/randen_round_keys.cc b/third_party/abseil/src/absl/random/internal/randen_round_keys.cc
new file mode 100644
index 0000000..5fb3ca5
--- /dev/null
+++ b/third_party/abseil/src/absl/random/internal/randen_round_keys.cc
@@ -0,0 +1,462 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/random/internal/randen_traits.h"
+
+// This file contains only the round keys for randen.
+//
+// "Nothing up my sleeve" numbers from the first hex digits of Pi, obtained
+// from http://hexpi.sourceforge.net/. The array was generated by following
+// Python script:
+
+/*
+python >tmp.cc << EOF
+"""Generates Randen round keys array from pi-hex.62500.txt file."""
+import binascii
+
+KEYS = 17 * 8
+
+def chunks(l, n):
+ """Yield successive n-sized chunks from l."""
+ for i in range(0, len(l), n):
+ yield l[i:i + n]
+
+def pairwise(t):
+ """Transforms sequence into sequence of pairs."""
+ it = iter(t)
+ return zip(it,it)
+
+def digits_from_pi():
+ """Reads digits from hexpi.sourceforge.net file."""
+ with open("pi-hex.62500.txt") as file:
+ return file.read()
+
+def digits_from_urandom():
+ """Reads digits from /dev/urandom."""
+ with open("/dev/urandom") as file:
+ return binascii.hexlify(file.read(KEYS * 16))
+
+def print_row(b)
+ print(" 0x{0}, 0x{1}, 0x{2}, 0x{3}, 0x{4}, 0x{5}, 0x{6}, 0x{7}, 0x{8}, 0x{9},
+0x{10}, 0x{11}, 0x{12}, 0x{13}, 0x{14}, 0x{15},".format(*b))
+
+
+digits = digits_from_pi()
+#digits = digits_from_urandom()
+
+print("namespace {")
+print("static constexpr size_t kKeyBytes = {0};\n".format(KEYS * 16))
+print("}")
+
+print("alignas(16) const unsigned char kRandenRoundKeysBE[kKeyBytes] = {")
+
+for i, u16 in zip(range(KEYS), chunks(digits, 32)):
+ b = list(chunks(u16, 2))
+ print_row(b)
+
+print("};")
+
+print("alignas(16) const unsigned char kRandenRoundKeys[kKeyBytes] = {")
+
+for i, u16 in zip(range(KEYS), chunks(digits, 32)):
+ b = list(chunks(u16, 2))
+ b.reverse()
+ print_row(b)
+
+print("};")
+
+EOF
+
+*/
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace random_internal {
+namespace {
+static constexpr size_t kKeyBytes = 2176;
+}
+
+alignas(16) const unsigned char kRandenRoundKeysBE[kKeyBytes] = {
+ 0x24, 0x3F, 0x6A, 0x88, 0x85, 0xA3, 0x08, 0xD3, 0x13, 0x19, 0x8A, 0x2E,
+ 0x03, 0x70, 0x73, 0x44, 0xA4, 0x09, 0x38, 0x22, 0x29, 0x9F, 0x31, 0xD0,
+ 0x08, 0x2E, 0xFA, 0x98, 0xEC, 0x4E, 0x6C, 0x89, 0x45, 0x28, 0x21, 0xE6,
+ 0x38, 0xD0, 0x13, 0x77, 0xBE, 0x54, 0x66, 0xCF, 0x34, 0xE9, 0x0C, 0x6C,
+ 0xC0, 0xAC, 0x29, 0xB7, 0xC9, 0x7C, 0x50, 0xDD, 0x3F, 0x84, 0xD5, 0xB5,
+ 0xB5, 0x47, 0x09, 0x17, 0x92, 0x16, 0xD5, 0xD9, 0x89, 0x79, 0xFB, 0x1B,
+ 0xD1, 0x31, 0x0B, 0xA6, 0x98, 0xDF, 0xB5, 0xAC, 0x2F, 0xFD, 0x72, 0xDB,
+ 0xD0, 0x1A, 0xDF, 0xB7, 0xB8, 0xE1, 0xAF, 0xED, 0x6A, 0x26, 0x7E, 0x96,
+ 0xBA, 0x7C, 0x90, 0x45, 0xF1, 0x2C, 0x7F, 0x99, 0x24, 0xA1, 0x99, 0x47,
+ 0xB3, 0x91, 0x6C, 0xF7, 0x08, 0x01, 0xF2, 0xE2, 0x85, 0x8E, 0xFC, 0x16,
+ 0x63, 0x69, 0x20, 0xD8, 0x71, 0x57, 0x4E, 0x69, 0xA4, 0x58, 0xFE, 0xA3,
+ 0xF4, 0x93, 0x3D, 0x7E, 0x0D, 0x95, 0x74, 0x8F, 0x72, 0x8E, 0xB6, 0x58,
+ 0x71, 0x8B, 0xCD, 0x58, 0x82, 0x15, 0x4A, 0xEE, 0x7B, 0x54, 0xA4, 0x1D,
+ 0xC2, 0x5A, 0x59, 0xB5, 0x9C, 0x30, 0xD5, 0x39, 0x2A, 0xF2, 0x60, 0x13,
+ 0xC5, 0xD1, 0xB0, 0x23, 0x28, 0x60, 0x85, 0xF0, 0xCA, 0x41, 0x79, 0x18,
+ 0xB8, 0xDB, 0x38, 0xEF, 0x8E, 0x79, 0xDC, 0xB0, 0x60, 0x3A, 0x18, 0x0E,
+ 0x6C, 0x9E, 0x0E, 0x8B, 0xB0, 0x1E, 0x8A, 0x3E, 0xD7, 0x15, 0x77, 0xC1,
+ 0xBD, 0x31, 0x4B, 0x27, 0x78, 0xAF, 0x2F, 0xDA, 0x55, 0x60, 0x5C, 0x60,
+ 0xE6, 0x55, 0x25, 0xF3, 0xAA, 0x55, 0xAB, 0x94, 0x57, 0x48, 0x98, 0x62,
+ 0x63, 0xE8, 0x14, 0x40, 0x55, 0xCA, 0x39, 0x6A, 0x2A, 0xAB, 0x10, 0xB6,
+ 0xB4, 0xCC, 0x5C, 0x34, 0x11, 0x41, 0xE8, 0xCE, 0xA1, 0x54, 0x86, 0xAF,
+ 0x7C, 0x72, 0xE9, 0x93, 0xB3, 0xEE, 0x14, 0x11, 0x63, 0x6F, 0xBC, 0x2A,
+ 0x2B, 0xA9, 0xC5, 0x5D, 0x74, 0x18, 0x31, 0xF6, 0xCE, 0x5C, 0x3E, 0x16,
+ 0x9B, 0x87, 0x93, 0x1E, 0xAF, 0xD6, 0xBA, 0x33, 0x6C, 0x24, 0xCF, 0x5C,
+ 0x7A, 0x32, 0x53, 0x81, 0x28, 0x95, 0x86, 0x77, 0x3B, 0x8F, 0x48, 0x98,
+ 0x6B, 0x4B, 0xB9, 0xAF, 0xC4, 0xBF, 0xE8, 0x1B, 0x66, 0x28, 0x21, 0x93,
+ 0x61, 0xD8, 0x09, 0xCC, 0xFB, 0x21, 0xA9, 0x91, 0x48, 0x7C, 0xAC, 0x60,
+ 0x5D, 0xEC, 0x80, 0x32, 0xEF, 0x84, 0x5D, 0x5D, 0xE9, 0x85, 0x75, 0xB1,
+ 0xDC, 0x26, 0x23, 0x02, 0xEB, 0x65, 0x1B, 0x88, 0x23, 0x89, 0x3E, 0x81,
+ 0xD3, 0x96, 0xAC, 0xC5, 0x0F, 0x6D, 0x6F, 0xF3, 0x83, 0xF4, 0x42, 0x39,
+ 0x2E, 0x0B, 0x44, 0x82, 0xA4, 0x84, 0x20, 0x04, 0x69, 0xC8, 0xF0, 0x4A,
+ 0x9E, 0x1F, 0x9B, 0x5E, 0x21, 0xC6, 0x68, 0x42, 0xF6, 0xE9, 0x6C, 0x9A,
+ 0x67, 0x0C, 0x9C, 0x61, 0xAB, 0xD3, 0x88, 0xF0, 0x6A, 0x51, 0xA0, 0xD2,
+ 0xD8, 0x54, 0x2F, 0x68, 0x96, 0x0F, 0xA7, 0x28, 0xAB, 0x51, 0x33, 0xA3,
+ 0x6E, 0xEF, 0x0B, 0x6C, 0x13, 0x7A, 0x3B, 0xE4, 0xBA, 0x3B, 0xF0, 0x50,
+ 0x7E, 0xFB, 0x2A, 0x98, 0xA1, 0xF1, 0x65, 0x1D, 0x39, 0xAF, 0x01, 0x76,
+ 0x66, 0xCA, 0x59, 0x3E, 0x82, 0x43, 0x0E, 0x88, 0x8C, 0xEE, 0x86, 0x19,
+ 0x45, 0x6F, 0x9F, 0xB4, 0x7D, 0x84, 0xA5, 0xC3, 0x3B, 0x8B, 0x5E, 0xBE,
+ 0xE0, 0x6F, 0x75, 0xD8, 0x85, 0xC1, 0x20, 0x73, 0x40, 0x1A, 0x44, 0x9F,
+ 0x56, 0xC1, 0x6A, 0xA6, 0x4E, 0xD3, 0xAA, 0x62, 0x36, 0x3F, 0x77, 0x06,
+ 0x1B, 0xFE, 0xDF, 0x72, 0x42, 0x9B, 0x02, 0x3D, 0x37, 0xD0, 0xD7, 0x24,
+ 0xD0, 0x0A, 0x12, 0x48, 0xDB, 0x0F, 0xEA, 0xD3, 0x49, 0xF1, 0xC0, 0x9B,
+ 0x07, 0x53, 0x72, 0xC9, 0x80, 0x99, 0x1B, 0x7B, 0x25, 0xD4, 0x79, 0xD8,
+ 0xF6, 0xE8, 0xDE, 0xF7, 0xE3, 0xFE, 0x50, 0x1A, 0xB6, 0x79, 0x4C, 0x3B,
+ 0x97, 0x6C, 0xE0, 0xBD, 0x04, 0xC0, 0x06, 0xBA, 0xC1, 0xA9, 0x4F, 0xB6,
+ 0x40, 0x9F, 0x60, 0xC4, 0x5E, 0x5C, 0x9E, 0xC2, 0x19, 0x6A, 0x24, 0x63,
+ 0x68, 0xFB, 0x6F, 0xAF, 0x3E, 0x6C, 0x53, 0xB5, 0x13, 0x39, 0xB2, 0xEB,
+ 0x3B, 0x52, 0xEC, 0x6F, 0x6D, 0xFC, 0x51, 0x1F, 0x9B, 0x30, 0x95, 0x2C,
+ 0xCC, 0x81, 0x45, 0x44, 0xAF, 0x5E, 0xBD, 0x09, 0xBE, 0xE3, 0xD0, 0x04,
+ 0xDE, 0x33, 0x4A, 0xFD, 0x66, 0x0F, 0x28, 0x07, 0x19, 0x2E, 0x4B, 0xB3,
+ 0xC0, 0xCB, 0xA8, 0x57, 0x45, 0xC8, 0x74, 0x0F, 0xD2, 0x0B, 0x5F, 0x39,
+ 0xB9, 0xD3, 0xFB, 0xDB, 0x55, 0x79, 0xC0, 0xBD, 0x1A, 0x60, 0x32, 0x0A,
+ 0xD6, 0xA1, 0x00, 0xC6, 0x40, 0x2C, 0x72, 0x79, 0x67, 0x9F, 0x25, 0xFE,
+ 0xFB, 0x1F, 0xA3, 0xCC, 0x8E, 0xA5, 0xE9, 0xF8, 0xDB, 0x32, 0x22, 0xF8,
+ 0x3C, 0x75, 0x16, 0xDF, 0xFD, 0x61, 0x6B, 0x15, 0x2F, 0x50, 0x1E, 0xC8,
+ 0xAD, 0x05, 0x52, 0xAB, 0x32, 0x3D, 0xB5, 0xFA, 0xFD, 0x23, 0x87, 0x60,
+ 0x53, 0x31, 0x7B, 0x48, 0x3E, 0x00, 0xDF, 0x82, 0x9E, 0x5C, 0x57, 0xBB,
+ 0xCA, 0x6F, 0x8C, 0xA0, 0x1A, 0x87, 0x56, 0x2E, 0xDF, 0x17, 0x69, 0xDB,
+ 0xD5, 0x42, 0xA8, 0xF6, 0x28, 0x7E, 0xFF, 0xC3, 0xAC, 0x67, 0x32, 0xC6,
+ 0x8C, 0x4F, 0x55, 0x73, 0x69, 0x5B, 0x27, 0xB0, 0xBB, 0xCA, 0x58, 0xC8,
+ 0xE1, 0xFF, 0xA3, 0x5D, 0xB8, 0xF0, 0x11, 0xA0, 0x10, 0xFA, 0x3D, 0x98,
+ 0xFD, 0x21, 0x83, 0xB8, 0x4A, 0xFC, 0xB5, 0x6C, 0x2D, 0xD1, 0xD3, 0x5B,
+ 0x9A, 0x53, 0xE4, 0x79, 0xB6, 0xF8, 0x45, 0x65, 0xD2, 0x8E, 0x49, 0xBC,
+ 0x4B, 0xFB, 0x97, 0x90, 0xE1, 0xDD, 0xF2, 0xDA, 0xA4, 0xCB, 0x7E, 0x33,
+ 0x62, 0xFB, 0x13, 0x41, 0xCE, 0xE4, 0xC6, 0xE8, 0xEF, 0x20, 0xCA, 0xDA,
+ 0x36, 0x77, 0x4C, 0x01, 0xD0, 0x7E, 0x9E, 0xFE, 0x2B, 0xF1, 0x1F, 0xB4,
+ 0x95, 0xDB, 0xDA, 0x4D, 0xAE, 0x90, 0x91, 0x98, 0xEA, 0xAD, 0x8E, 0x71,
+ 0x6B, 0x93, 0xD5, 0xA0, 0xD0, 0x8E, 0xD1, 0xD0, 0xAF, 0xC7, 0x25, 0xE0,
+ 0x8E, 0x3C, 0x5B, 0x2F, 0x8E, 0x75, 0x94, 0xB7, 0x8F, 0xF6, 0xE2, 0xFB,
+ 0xF2, 0x12, 0x2B, 0x64, 0x88, 0x88, 0xB8, 0x12, 0x90, 0x0D, 0xF0, 0x1C,
+ 0x4F, 0xAD, 0x5E, 0xA0, 0x68, 0x8F, 0xC3, 0x1C, 0xD1, 0xCF, 0xF1, 0x91,
+ 0xB3, 0xA8, 0xC1, 0xAD, 0x2F, 0x2F, 0x22, 0x18, 0xBE, 0x0E, 0x17, 0x77,
+ 0xEA, 0x75, 0x2D, 0xFE, 0x8B, 0x02, 0x1F, 0xA1, 0xE5, 0xA0, 0xCC, 0x0F,
+ 0xB5, 0x6F, 0x74, 0xE8, 0x18, 0xAC, 0xF3, 0xD6, 0xCE, 0x89, 0xE2, 0x99,
+ 0xB4, 0xA8, 0x4F, 0xE0, 0xFD, 0x13, 0xE0, 0xB7, 0x7C, 0xC4, 0x3B, 0x81,
+ 0xD2, 0xAD, 0xA8, 0xD9, 0x16, 0x5F, 0xA2, 0x66, 0x80, 0x95, 0x77, 0x05,
+ 0x93, 0xCC, 0x73, 0x14, 0x21, 0x1A, 0x14, 0x77, 0xE6, 0xAD, 0x20, 0x65,
+ 0x77, 0xB5, 0xFA, 0x86, 0xC7, 0x54, 0x42, 0xF5, 0xFB, 0x9D, 0x35, 0xCF,
+ 0xEB, 0xCD, 0xAF, 0x0C, 0x7B, 0x3E, 0x89, 0xA0, 0xD6, 0x41, 0x1B, 0xD3,
+ 0xAE, 0x1E, 0x7E, 0x49, 0x00, 0x25, 0x0E, 0x2D, 0x20, 0x71, 0xB3, 0x5E,
+ 0x22, 0x68, 0x00, 0xBB, 0x57, 0xB8, 0xE0, 0xAF, 0x24, 0x64, 0x36, 0x9B,
+ 0xF0, 0x09, 0xB9, 0x1E, 0x55, 0x63, 0x91, 0x1D, 0x59, 0xDF, 0xA6, 0xAA,
+ 0x78, 0xC1, 0x43, 0x89, 0xD9, 0x5A, 0x53, 0x7F, 0x20, 0x7D, 0x5B, 0xA2,
+ 0x02, 0xE5, 0xB9, 0xC5, 0x83, 0x26, 0x03, 0x76, 0x62, 0x95, 0xCF, 0xA9,
+ 0x11, 0xC8, 0x19, 0x68, 0x4E, 0x73, 0x4A, 0x41, 0xB3, 0x47, 0x2D, 0xCA,
+ 0x7B, 0x14, 0xA9, 0x4A, 0x1B, 0x51, 0x00, 0x52, 0x9A, 0x53, 0x29, 0x15,
+ 0xD6, 0x0F, 0x57, 0x3F, 0xBC, 0x9B, 0xC6, 0xE4, 0x2B, 0x60, 0xA4, 0x76,
+ 0x81, 0xE6, 0x74, 0x00, 0x08, 0xBA, 0x6F, 0xB5, 0x57, 0x1B, 0xE9, 0x1F,
+ 0xF2, 0x96, 0xEC, 0x6B, 0x2A, 0x0D, 0xD9, 0x15, 0xB6, 0x63, 0x65, 0x21,
+ 0xE7, 0xB9, 0xF9, 0xB6, 0xFF, 0x34, 0x05, 0x2E, 0xC5, 0x85, 0x56, 0x64,
+ 0x53, 0xB0, 0x2D, 0x5D, 0xA9, 0x9F, 0x8F, 0xA1, 0x08, 0xBA, 0x47, 0x99,
+ 0x6E, 0x85, 0x07, 0x6A, 0x4B, 0x7A, 0x70, 0xE9, 0xB5, 0xB3, 0x29, 0x44,
+ 0xDB, 0x75, 0x09, 0x2E, 0xC4, 0x19, 0x26, 0x23, 0xAD, 0x6E, 0xA6, 0xB0,
+ 0x49, 0xA7, 0xDF, 0x7D, 0x9C, 0xEE, 0x60, 0xB8, 0x8F, 0xED, 0xB2, 0x66,
+ 0xEC, 0xAA, 0x8C, 0x71, 0x69, 0x9A, 0x18, 0xFF, 0x56, 0x64, 0x52, 0x6C,
+ 0xC2, 0xB1, 0x9E, 0xE1, 0x19, 0x36, 0x02, 0xA5, 0x75, 0x09, 0x4C, 0x29,
+ 0xA0, 0x59, 0x13, 0x40, 0xE4, 0x18, 0x3A, 0x3E, 0x3F, 0x54, 0x98, 0x9A,
+ 0x5B, 0x42, 0x9D, 0x65, 0x6B, 0x8F, 0xE4, 0xD6, 0x99, 0xF7, 0x3F, 0xD6,
+ 0xA1, 0xD2, 0x9C, 0x07, 0xEF, 0xE8, 0x30, 0xF5, 0x4D, 0x2D, 0x38, 0xE6,
+ 0xF0, 0x25, 0x5D, 0xC1, 0x4C, 0xDD, 0x20, 0x86, 0x84, 0x70, 0xEB, 0x26,
+ 0x63, 0x82, 0xE9, 0xC6, 0x02, 0x1E, 0xCC, 0x5E, 0x09, 0x68, 0x6B, 0x3F,
+ 0x3E, 0xBA, 0xEF, 0xC9, 0x3C, 0x97, 0x18, 0x14, 0x6B, 0x6A, 0x70, 0xA1,
+ 0x68, 0x7F, 0x35, 0x84, 0x52, 0xA0, 0xE2, 0x86, 0xB7, 0x9C, 0x53, 0x05,
+ 0xAA, 0x50, 0x07, 0x37, 0x3E, 0x07, 0x84, 0x1C, 0x7F, 0xDE, 0xAE, 0x5C,
+ 0x8E, 0x7D, 0x44, 0xEC, 0x57, 0x16, 0xF2, 0xB8, 0xB0, 0x3A, 0xDA, 0x37,
+ 0xF0, 0x50, 0x0C, 0x0D, 0xF0, 0x1C, 0x1F, 0x04, 0x02, 0x00, 0xB3, 0xFF,
+ 0xAE, 0x0C, 0xF5, 0x1A, 0x3C, 0xB5, 0x74, 0xB2, 0x25, 0x83, 0x7A, 0x58,
+ 0xDC, 0x09, 0x21, 0xBD, 0xD1, 0x91, 0x13, 0xF9, 0x7C, 0xA9, 0x2F, 0xF6,
+ 0x94, 0x32, 0x47, 0x73, 0x22, 0xF5, 0x47, 0x01, 0x3A, 0xE5, 0xE5, 0x81,
+ 0x37, 0xC2, 0xDA, 0xDC, 0xC8, 0xB5, 0x76, 0x34, 0x9A, 0xF3, 0xDD, 0xA7,
+ 0xA9, 0x44, 0x61, 0x46, 0x0F, 0xD0, 0x03, 0x0E, 0xEC, 0xC8, 0xC7, 0x3E,
+ 0xA4, 0x75, 0x1E, 0x41, 0xE2, 0x38, 0xCD, 0x99, 0x3B, 0xEA, 0x0E, 0x2F,
+ 0x32, 0x80, 0xBB, 0xA1, 0x18, 0x3E, 0xB3, 0x31, 0x4E, 0x54, 0x8B, 0x38,
+ 0x4F, 0x6D, 0xB9, 0x08, 0x6F, 0x42, 0x0D, 0x03, 0xF6, 0x0A, 0x04, 0xBF,
+ 0x2C, 0xB8, 0x12, 0x90, 0x24, 0x97, 0x7C, 0x79, 0x56, 0x79, 0xB0, 0x72,
+ 0xBC, 0xAF, 0x89, 0xAF, 0xDE, 0x9A, 0x77, 0x1F, 0xD9, 0x93, 0x08, 0x10,
+ 0xB3, 0x8B, 0xAE, 0x12, 0xDC, 0xCF, 0x3F, 0x2E, 0x55, 0x12, 0x72, 0x1F,
+ 0x2E, 0x6B, 0x71, 0x24, 0x50, 0x1A, 0xDD, 0xE6, 0x9F, 0x84, 0xCD, 0x87,
+ 0x7A, 0x58, 0x47, 0x18, 0x74, 0x08, 0xDA, 0x17, 0xBC, 0x9F, 0x9A, 0xBC,
+ 0xE9, 0x4B, 0x7D, 0x8C, 0xEC, 0x7A, 0xEC, 0x3A, 0xDB, 0x85, 0x1D, 0xFA,
+ 0x63, 0x09, 0x43, 0x66, 0xC4, 0x64, 0xC3, 0xD2, 0xEF, 0x1C, 0x18, 0x47,
+ 0x32, 0x15, 0xD8, 0x08, 0xDD, 0x43, 0x3B, 0x37, 0x24, 0xC2, 0xBA, 0x16,
+ 0x12, 0xA1, 0x4D, 0x43, 0x2A, 0x65, 0xC4, 0x51, 0x50, 0x94, 0x00, 0x02,
+ 0x13, 0x3A, 0xE4, 0xDD, 0x71, 0xDF, 0xF8, 0x9E, 0x10, 0x31, 0x4E, 0x55,
+ 0x81, 0xAC, 0x77, 0xD6, 0x5F, 0x11, 0x19, 0x9B, 0x04, 0x35, 0x56, 0xF1,
+ 0xD7, 0xA3, 0xC7, 0x6B, 0x3C, 0x11, 0x18, 0x3B, 0x59, 0x24, 0xA5, 0x09,
+ 0xF2, 0x8F, 0xE6, 0xED, 0x97, 0xF1, 0xFB, 0xFA, 0x9E, 0xBA, 0xBF, 0x2C,
+ 0x1E, 0x15, 0x3C, 0x6E, 0x86, 0xE3, 0x45, 0x70, 0xEA, 0xE9, 0x6F, 0xB1,
+ 0x86, 0x0E, 0x5E, 0x0A, 0x5A, 0x3E, 0x2A, 0xB3, 0x77, 0x1F, 0xE7, 0x1C,
+ 0x4E, 0x3D, 0x06, 0xFA, 0x29, 0x65, 0xDC, 0xB9, 0x99, 0xE7, 0x1D, 0x0F,
+ 0x80, 0x3E, 0x89, 0xD6, 0x52, 0x66, 0xC8, 0x25, 0x2E, 0x4C, 0xC9, 0x78,
+ 0x9C, 0x10, 0xB3, 0x6A, 0xC6, 0x15, 0x0E, 0xBA, 0x94, 0xE2, 0xEA, 0x78,
+ 0xA6, 0xFC, 0x3C, 0x53, 0x1E, 0x0A, 0x2D, 0xF4, 0xF2, 0xF7, 0x4E, 0xA7,
+ 0x36, 0x1D, 0x2B, 0x3D, 0x19, 0x39, 0x26, 0x0F, 0x19, 0xC2, 0x79, 0x60,
+ 0x52, 0x23, 0xA7, 0x08, 0xF7, 0x13, 0x12, 0xB6, 0xEB, 0xAD, 0xFE, 0x6E,
+ 0xEA, 0xC3, 0x1F, 0x66, 0xE3, 0xBC, 0x45, 0x95, 0xA6, 0x7B, 0xC8, 0x83,
+ 0xB1, 0x7F, 0x37, 0xD1, 0x01, 0x8C, 0xFF, 0x28, 0xC3, 0x32, 0xDD, 0xEF,
+ 0xBE, 0x6C, 0x5A, 0xA5, 0x65, 0x58, 0x21, 0x85, 0x68, 0xAB, 0x97, 0x02,
+ 0xEE, 0xCE, 0xA5, 0x0F, 0xDB, 0x2F, 0x95, 0x3B, 0x2A, 0xEF, 0x7D, 0xAD,
+ 0x5B, 0x6E, 0x2F, 0x84, 0x15, 0x21, 0xB6, 0x28, 0x29, 0x07, 0x61, 0x70,
+ 0xEC, 0xDD, 0x47, 0x75, 0x61, 0x9F, 0x15, 0x10, 0x13, 0xCC, 0xA8, 0x30,
+ 0xEB, 0x61, 0xBD, 0x96, 0x03, 0x34, 0xFE, 0x1E, 0xAA, 0x03, 0x63, 0xCF,
+ 0xB5, 0x73, 0x5C, 0x90, 0x4C, 0x70, 0xA2, 0x39, 0xD5, 0x9E, 0x9E, 0x0B,
+ 0xCB, 0xAA, 0xDE, 0x14, 0xEE, 0xCC, 0x86, 0xBC, 0x60, 0x62, 0x2C, 0xA7,
+ 0x9C, 0xAB, 0x5C, 0xAB, 0xB2, 0xF3, 0x84, 0x6E, 0x64, 0x8B, 0x1E, 0xAF,
+ 0x19, 0xBD, 0xF0, 0xCA, 0xA0, 0x23, 0x69, 0xB9, 0x65, 0x5A, 0xBB, 0x50,
+ 0x40, 0x68, 0x5A, 0x32, 0x3C, 0x2A, 0xB4, 0xB3, 0x31, 0x9E, 0xE9, 0xD5,
+ 0xC0, 0x21, 0xB8, 0xF7, 0x9B, 0x54, 0x0B, 0x19, 0x87, 0x5F, 0xA0, 0x99,
+ 0x95, 0xF7, 0x99, 0x7E, 0x62, 0x3D, 0x7D, 0xA8, 0xF8, 0x37, 0x88, 0x9A,
+ 0x97, 0xE3, 0x2D, 0x77, 0x11, 0xED, 0x93, 0x5F, 0x16, 0x68, 0x12, 0x81,
+ 0x0E, 0x35, 0x88, 0x29, 0xC7, 0xE6, 0x1F, 0xD6, 0x96, 0xDE, 0xDF, 0xA1,
+ 0x78, 0x58, 0xBA, 0x99, 0x57, 0xF5, 0x84, 0xA5, 0x1B, 0x22, 0x72, 0x63,
+ 0x9B, 0x83, 0xC3, 0xFF, 0x1A, 0xC2, 0x46, 0x96, 0xCD, 0xB3, 0x0A, 0xEB,
+ 0x53, 0x2E, 0x30, 0x54, 0x8F, 0xD9, 0x48, 0xE4, 0x6D, 0xBC, 0x31, 0x28,
+ 0x58, 0xEB, 0xF2, 0xEF, 0x34, 0xC6, 0xFF, 0xEA, 0xFE, 0x28, 0xED, 0x61,
+ 0xEE, 0x7C, 0x3C, 0x73, 0x5D, 0x4A, 0x14, 0xD9, 0xE8, 0x64, 0xB7, 0xE3,
+ 0x42, 0x10, 0x5D, 0x14, 0x20, 0x3E, 0x13, 0xE0, 0x45, 0xEE, 0xE2, 0xB6,
+ 0xA3, 0xAA, 0xAB, 0xEA, 0xDB, 0x6C, 0x4F, 0x15, 0xFA, 0xCB, 0x4F, 0xD0,
+ 0xC7, 0x42, 0xF4, 0x42, 0xEF, 0x6A, 0xBB, 0xB5, 0x65, 0x4F, 0x3B, 0x1D,
+ 0x41, 0xCD, 0x21, 0x05, 0xD8, 0x1E, 0x79, 0x9E, 0x86, 0x85, 0x4D, 0xC7,
+ 0xE4, 0x4B, 0x47, 0x6A, 0x3D, 0x81, 0x62, 0x50, 0xCF, 0x62, 0xA1, 0xF2,
+ 0x5B, 0x8D, 0x26, 0x46, 0xFC, 0x88, 0x83, 0xA0, 0xC1, 0xC7, 0xB6, 0xA3,
+ 0x7F, 0x15, 0x24, 0xC3, 0x69, 0xCB, 0x74, 0x92, 0x47, 0x84, 0x8A, 0x0B,
+ 0x56, 0x92, 0xB2, 0x85, 0x09, 0x5B, 0xBF, 0x00, 0xAD, 0x19, 0x48, 0x9D,
+ 0x14, 0x62, 0xB1, 0x74, 0x23, 0x82, 0x0D, 0x00, 0x58, 0x42, 0x8D, 0x2A,
+ 0x0C, 0x55, 0xF5, 0xEA, 0x1D, 0xAD, 0xF4, 0x3E, 0x23, 0x3F, 0x70, 0x61,
+ 0x33, 0x72, 0xF0, 0x92, 0x8D, 0x93, 0x7E, 0x41, 0xD6, 0x5F, 0xEC, 0xF1,
+ 0x6C, 0x22, 0x3B, 0xDB, 0x7C, 0xDE, 0x37, 0x59, 0xCB, 0xEE, 0x74, 0x60,
+ 0x40, 0x85, 0xF2, 0xA7, 0xCE, 0x77, 0x32, 0x6E, 0xA6, 0x07, 0x80, 0x84,
+ 0x19, 0xF8, 0x50, 0x9E, 0xE8, 0xEF, 0xD8, 0x55, 0x61, 0xD9, 0x97, 0x35,
+ 0xA9, 0x69, 0xA7, 0xAA, 0xC5, 0x0C, 0x06, 0xC2, 0x5A, 0x04, 0xAB, 0xFC,
+ 0x80, 0x0B, 0xCA, 0xDC, 0x9E, 0x44, 0x7A, 0x2E, 0xC3, 0x45, 0x34, 0x84,
+ 0xFD, 0xD5, 0x67, 0x05, 0x0E, 0x1E, 0x9E, 0xC9, 0xDB, 0x73, 0xDB, 0xD3,
+ 0x10, 0x55, 0x88, 0xCD, 0x67, 0x5F, 0xDA, 0x79, 0xE3, 0x67, 0x43, 0x40,
+ 0xC5, 0xC4, 0x34, 0x65, 0x71, 0x3E, 0x38, 0xD8, 0x3D, 0x28, 0xF8, 0x9E,
+ 0xF1, 0x6D, 0xFF, 0x20, 0x15, 0x3E, 0x21, 0xE7, 0x8F, 0xB0, 0x3D, 0x4A,
+ 0xE6, 0xE3, 0x9F, 0x2B, 0xDB, 0x83, 0xAD, 0xF7, 0xE9, 0x3D, 0x5A, 0x68,
+ 0x94, 0x81, 0x40, 0xF7, 0xF6, 0x4C, 0x26, 0x1C, 0x94, 0x69, 0x29, 0x34,
+ 0x41, 0x15, 0x20, 0xF7, 0x76, 0x02, 0xD4, 0xF7, 0xBC, 0xF4, 0x6B, 0x2E,
+ 0xD4, 0xA1, 0x00, 0x68, 0xD4, 0x08, 0x24, 0x71, 0x33, 0x20, 0xF4, 0x6A,
+ 0x43, 0xB7, 0xD4, 0xB7, 0x50, 0x00, 0x61, 0xAF, 0x1E, 0x39, 0xF6, 0x2E,
+ 0x97, 0x24, 0x45, 0x46,
+};
+
+alignas(16) const unsigned char kRandenRoundKeys[kKeyBytes] = {
+ 0x44, 0x73, 0x70, 0x03, 0x2E, 0x8A, 0x19, 0x13, 0xD3, 0x08, 0xA3, 0x85,
+ 0x88, 0x6A, 0x3F, 0x24, 0x89, 0x6C, 0x4E, 0xEC, 0x98, 0xFA, 0x2E, 0x08,
+ 0xD0, 0x31, 0x9F, 0x29, 0x22, 0x38, 0x09, 0xA4, 0x6C, 0x0C, 0xE9, 0x34,
+ 0xCF, 0x66, 0x54, 0xBE, 0x77, 0x13, 0xD0, 0x38, 0xE6, 0x21, 0x28, 0x45,
+ 0x17, 0x09, 0x47, 0xB5, 0xB5, 0xD5, 0x84, 0x3F, 0xDD, 0x50, 0x7C, 0xC9,
+ 0xB7, 0x29, 0xAC, 0xC0, 0xAC, 0xB5, 0xDF, 0x98, 0xA6, 0x0B, 0x31, 0xD1,
+ 0x1B, 0xFB, 0x79, 0x89, 0xD9, 0xD5, 0x16, 0x92, 0x96, 0x7E, 0x26, 0x6A,
+ 0xED, 0xAF, 0xE1, 0xB8, 0xB7, 0xDF, 0x1A, 0xD0, 0xDB, 0x72, 0xFD, 0x2F,
+ 0xF7, 0x6C, 0x91, 0xB3, 0x47, 0x99, 0xA1, 0x24, 0x99, 0x7F, 0x2C, 0xF1,
+ 0x45, 0x90, 0x7C, 0xBA, 0x69, 0x4E, 0x57, 0x71, 0xD8, 0x20, 0x69, 0x63,
+ 0x16, 0xFC, 0x8E, 0x85, 0xE2, 0xF2, 0x01, 0x08, 0x58, 0xB6, 0x8E, 0x72,
+ 0x8F, 0x74, 0x95, 0x0D, 0x7E, 0x3D, 0x93, 0xF4, 0xA3, 0xFE, 0x58, 0xA4,
+ 0xB5, 0x59, 0x5A, 0xC2, 0x1D, 0xA4, 0x54, 0x7B, 0xEE, 0x4A, 0x15, 0x82,
+ 0x58, 0xCD, 0x8B, 0x71, 0xF0, 0x85, 0x60, 0x28, 0x23, 0xB0, 0xD1, 0xC5,
+ 0x13, 0x60, 0xF2, 0x2A, 0x39, 0xD5, 0x30, 0x9C, 0x0E, 0x18, 0x3A, 0x60,
+ 0xB0, 0xDC, 0x79, 0x8E, 0xEF, 0x38, 0xDB, 0xB8, 0x18, 0x79, 0x41, 0xCA,
+ 0x27, 0x4B, 0x31, 0xBD, 0xC1, 0x77, 0x15, 0xD7, 0x3E, 0x8A, 0x1E, 0xB0,
+ 0x8B, 0x0E, 0x9E, 0x6C, 0x94, 0xAB, 0x55, 0xAA, 0xF3, 0x25, 0x55, 0xE6,
+ 0x60, 0x5C, 0x60, 0x55, 0xDA, 0x2F, 0xAF, 0x78, 0xB6, 0x10, 0xAB, 0x2A,
+ 0x6A, 0x39, 0xCA, 0x55, 0x40, 0x14, 0xE8, 0x63, 0x62, 0x98, 0x48, 0x57,
+ 0x93, 0xE9, 0x72, 0x7C, 0xAF, 0x86, 0x54, 0xA1, 0xCE, 0xE8, 0x41, 0x11,
+ 0x34, 0x5C, 0xCC, 0xB4, 0xF6, 0x31, 0x18, 0x74, 0x5D, 0xC5, 0xA9, 0x2B,
+ 0x2A, 0xBC, 0x6F, 0x63, 0x11, 0x14, 0xEE, 0xB3, 0x5C, 0xCF, 0x24, 0x6C,
+ 0x33, 0xBA, 0xD6, 0xAF, 0x1E, 0x93, 0x87, 0x9B, 0x16, 0x3E, 0x5C, 0xCE,
+ 0xAF, 0xB9, 0x4B, 0x6B, 0x98, 0x48, 0x8F, 0x3B, 0x77, 0x86, 0x95, 0x28,
+ 0x81, 0x53, 0x32, 0x7A, 0x91, 0xA9, 0x21, 0xFB, 0xCC, 0x09, 0xD8, 0x61,
+ 0x93, 0x21, 0x28, 0x66, 0x1B, 0xE8, 0xBF, 0xC4, 0xB1, 0x75, 0x85, 0xE9,
+ 0x5D, 0x5D, 0x84, 0xEF, 0x32, 0x80, 0xEC, 0x5D, 0x60, 0xAC, 0x7C, 0x48,
+ 0xC5, 0xAC, 0x96, 0xD3, 0x81, 0x3E, 0x89, 0x23, 0x88, 0x1B, 0x65, 0xEB,
+ 0x02, 0x23, 0x26, 0xDC, 0x04, 0x20, 0x84, 0xA4, 0x82, 0x44, 0x0B, 0x2E,
+ 0x39, 0x42, 0xF4, 0x83, 0xF3, 0x6F, 0x6D, 0x0F, 0x9A, 0x6C, 0xE9, 0xF6,
+ 0x42, 0x68, 0xC6, 0x21, 0x5E, 0x9B, 0x1F, 0x9E, 0x4A, 0xF0, 0xC8, 0x69,
+ 0x68, 0x2F, 0x54, 0xD8, 0xD2, 0xA0, 0x51, 0x6A, 0xF0, 0x88, 0xD3, 0xAB,
+ 0x61, 0x9C, 0x0C, 0x67, 0xE4, 0x3B, 0x7A, 0x13, 0x6C, 0x0B, 0xEF, 0x6E,
+ 0xA3, 0x33, 0x51, 0xAB, 0x28, 0xA7, 0x0F, 0x96, 0x76, 0x01, 0xAF, 0x39,
+ 0x1D, 0x65, 0xF1, 0xA1, 0x98, 0x2A, 0xFB, 0x7E, 0x50, 0xF0, 0x3B, 0xBA,
+ 0xB4, 0x9F, 0x6F, 0x45, 0x19, 0x86, 0xEE, 0x8C, 0x88, 0x0E, 0x43, 0x82,
+ 0x3E, 0x59, 0xCA, 0x66, 0x73, 0x20, 0xC1, 0x85, 0xD8, 0x75, 0x6F, 0xE0,
+ 0xBE, 0x5E, 0x8B, 0x3B, 0xC3, 0xA5, 0x84, 0x7D, 0x06, 0x77, 0x3F, 0x36,
+ 0x62, 0xAA, 0xD3, 0x4E, 0xA6, 0x6A, 0xC1, 0x56, 0x9F, 0x44, 0x1A, 0x40,
+ 0x48, 0x12, 0x0A, 0xD0, 0x24, 0xD7, 0xD0, 0x37, 0x3D, 0x02, 0x9B, 0x42,
+ 0x72, 0xDF, 0xFE, 0x1B, 0x7B, 0x1B, 0x99, 0x80, 0xC9, 0x72, 0x53, 0x07,
+ 0x9B, 0xC0, 0xF1, 0x49, 0xD3, 0xEA, 0x0F, 0xDB, 0x3B, 0x4C, 0x79, 0xB6,
+ 0x1A, 0x50, 0xFE, 0xE3, 0xF7, 0xDE, 0xE8, 0xF6, 0xD8, 0x79, 0xD4, 0x25,
+ 0xC4, 0x60, 0x9F, 0x40, 0xB6, 0x4F, 0xA9, 0xC1, 0xBA, 0x06, 0xC0, 0x04,
+ 0xBD, 0xE0, 0x6C, 0x97, 0xB5, 0x53, 0x6C, 0x3E, 0xAF, 0x6F, 0xFB, 0x68,
+ 0x63, 0x24, 0x6A, 0x19, 0xC2, 0x9E, 0x5C, 0x5E, 0x2C, 0x95, 0x30, 0x9B,
+ 0x1F, 0x51, 0xFC, 0x6D, 0x6F, 0xEC, 0x52, 0x3B, 0xEB, 0xB2, 0x39, 0x13,
+ 0xFD, 0x4A, 0x33, 0xDE, 0x04, 0xD0, 0xE3, 0xBE, 0x09, 0xBD, 0x5E, 0xAF,
+ 0x44, 0x45, 0x81, 0xCC, 0x0F, 0x74, 0xC8, 0x45, 0x57, 0xA8, 0xCB, 0xC0,
+ 0xB3, 0x4B, 0x2E, 0x19, 0x07, 0x28, 0x0F, 0x66, 0x0A, 0x32, 0x60, 0x1A,
+ 0xBD, 0xC0, 0x79, 0x55, 0xDB, 0xFB, 0xD3, 0xB9, 0x39, 0x5F, 0x0B, 0xD2,
+ 0xCC, 0xA3, 0x1F, 0xFB, 0xFE, 0x25, 0x9F, 0x67, 0x79, 0x72, 0x2C, 0x40,
+ 0xC6, 0x00, 0xA1, 0xD6, 0x15, 0x6B, 0x61, 0xFD, 0xDF, 0x16, 0x75, 0x3C,
+ 0xF8, 0x22, 0x32, 0xDB, 0xF8, 0xE9, 0xA5, 0x8E, 0x60, 0x87, 0x23, 0xFD,
+ 0xFA, 0xB5, 0x3D, 0x32, 0xAB, 0x52, 0x05, 0xAD, 0xC8, 0x1E, 0x50, 0x2F,
+ 0xA0, 0x8C, 0x6F, 0xCA, 0xBB, 0x57, 0x5C, 0x9E, 0x82, 0xDF, 0x00, 0x3E,
+ 0x48, 0x7B, 0x31, 0x53, 0xC3, 0xFF, 0x7E, 0x28, 0xF6, 0xA8, 0x42, 0xD5,
+ 0xDB, 0x69, 0x17, 0xDF, 0x2E, 0x56, 0x87, 0x1A, 0xC8, 0x58, 0xCA, 0xBB,
+ 0xB0, 0x27, 0x5B, 0x69, 0x73, 0x55, 0x4F, 0x8C, 0xC6, 0x32, 0x67, 0xAC,
+ 0xB8, 0x83, 0x21, 0xFD, 0x98, 0x3D, 0xFA, 0x10, 0xA0, 0x11, 0xF0, 0xB8,
+ 0x5D, 0xA3, 0xFF, 0xE1, 0x65, 0x45, 0xF8, 0xB6, 0x79, 0xE4, 0x53, 0x9A,
+ 0x5B, 0xD3, 0xD1, 0x2D, 0x6C, 0xB5, 0xFC, 0x4A, 0x33, 0x7E, 0xCB, 0xA4,
+ 0xDA, 0xF2, 0xDD, 0xE1, 0x90, 0x97, 0xFB, 0x4B, 0xBC, 0x49, 0x8E, 0xD2,
+ 0x01, 0x4C, 0x77, 0x36, 0xDA, 0xCA, 0x20, 0xEF, 0xE8, 0xC6, 0xE4, 0xCE,
+ 0x41, 0x13, 0xFB, 0x62, 0x98, 0x91, 0x90, 0xAE, 0x4D, 0xDA, 0xDB, 0x95,
+ 0xB4, 0x1F, 0xF1, 0x2B, 0xFE, 0x9E, 0x7E, 0xD0, 0xE0, 0x25, 0xC7, 0xAF,
+ 0xD0, 0xD1, 0x8E, 0xD0, 0xA0, 0xD5, 0x93, 0x6B, 0x71, 0x8E, 0xAD, 0xEA,
+ 0x64, 0x2B, 0x12, 0xF2, 0xFB, 0xE2, 0xF6, 0x8F, 0xB7, 0x94, 0x75, 0x8E,
+ 0x2F, 0x5B, 0x3C, 0x8E, 0x1C, 0xC3, 0x8F, 0x68, 0xA0, 0x5E, 0xAD, 0x4F,
+ 0x1C, 0xF0, 0x0D, 0x90, 0x12, 0xB8, 0x88, 0x88, 0x77, 0x17, 0x0E, 0xBE,
+ 0x18, 0x22, 0x2F, 0x2F, 0xAD, 0xC1, 0xA8, 0xB3, 0x91, 0xF1, 0xCF, 0xD1,
+ 0xE8, 0x74, 0x6F, 0xB5, 0x0F, 0xCC, 0xA0, 0xE5, 0xA1, 0x1F, 0x02, 0x8B,
+ 0xFE, 0x2D, 0x75, 0xEA, 0xB7, 0xE0, 0x13, 0xFD, 0xE0, 0x4F, 0xA8, 0xB4,
+ 0x99, 0xE2, 0x89, 0xCE, 0xD6, 0xF3, 0xAC, 0x18, 0x05, 0x77, 0x95, 0x80,
+ 0x66, 0xA2, 0x5F, 0x16, 0xD9, 0xA8, 0xAD, 0xD2, 0x81, 0x3B, 0xC4, 0x7C,
+ 0x86, 0xFA, 0xB5, 0x77, 0x65, 0x20, 0xAD, 0xE6, 0x77, 0x14, 0x1A, 0x21,
+ 0x14, 0x73, 0xCC, 0x93, 0xA0, 0x89, 0x3E, 0x7B, 0x0C, 0xAF, 0xCD, 0xEB,
+ 0xCF, 0x35, 0x9D, 0xFB, 0xF5, 0x42, 0x54, 0xC7, 0x5E, 0xB3, 0x71, 0x20,
+ 0x2D, 0x0E, 0x25, 0x00, 0x49, 0x7E, 0x1E, 0xAE, 0xD3, 0x1B, 0x41, 0xD6,
+ 0x1E, 0xB9, 0x09, 0xF0, 0x9B, 0x36, 0x64, 0x24, 0xAF, 0xE0, 0xB8, 0x57,
+ 0xBB, 0x00, 0x68, 0x22, 0x7F, 0x53, 0x5A, 0xD9, 0x89, 0x43, 0xC1, 0x78,
+ 0xAA, 0xA6, 0xDF, 0x59, 0x1D, 0x91, 0x63, 0x55, 0xA9, 0xCF, 0x95, 0x62,
+ 0x76, 0x03, 0x26, 0x83, 0xC5, 0xB9, 0xE5, 0x02, 0xA2, 0x5B, 0x7D, 0x20,
+ 0x4A, 0xA9, 0x14, 0x7B, 0xCA, 0x2D, 0x47, 0xB3, 0x41, 0x4A, 0x73, 0x4E,
+ 0x68, 0x19, 0xC8, 0x11, 0xE4, 0xC6, 0x9B, 0xBC, 0x3F, 0x57, 0x0F, 0xD6,
+ 0x15, 0x29, 0x53, 0x9A, 0x52, 0x00, 0x51, 0x1B, 0x1F, 0xE9, 0x1B, 0x57,
+ 0xB5, 0x6F, 0xBA, 0x08, 0x00, 0x74, 0xE6, 0x81, 0x76, 0xA4, 0x60, 0x2B,
+ 0xB6, 0xF9, 0xB9, 0xE7, 0x21, 0x65, 0x63, 0xB6, 0x15, 0xD9, 0x0D, 0x2A,
+ 0x6B, 0xEC, 0x96, 0xF2, 0xA1, 0x8F, 0x9F, 0xA9, 0x5D, 0x2D, 0xB0, 0x53,
+ 0x64, 0x56, 0x85, 0xC5, 0x2E, 0x05, 0x34, 0xFF, 0x44, 0x29, 0xB3, 0xB5,
+ 0xE9, 0x70, 0x7A, 0x4B, 0x6A, 0x07, 0x85, 0x6E, 0x99, 0x47, 0xBA, 0x08,
+ 0x7D, 0xDF, 0xA7, 0x49, 0xB0, 0xA6, 0x6E, 0xAD, 0x23, 0x26, 0x19, 0xC4,
+ 0x2E, 0x09, 0x75, 0xDB, 0xFF, 0x18, 0x9A, 0x69, 0x71, 0x8C, 0xAA, 0xEC,
+ 0x66, 0xB2, 0xED, 0x8F, 0xB8, 0x60, 0xEE, 0x9C, 0x29, 0x4C, 0x09, 0x75,
+ 0xA5, 0x02, 0x36, 0x19, 0xE1, 0x9E, 0xB1, 0xC2, 0x6C, 0x52, 0x64, 0x56,
+ 0x65, 0x9D, 0x42, 0x5B, 0x9A, 0x98, 0x54, 0x3F, 0x3E, 0x3A, 0x18, 0xE4,
+ 0x40, 0x13, 0x59, 0xA0, 0xF5, 0x30, 0xE8, 0xEF, 0x07, 0x9C, 0xD2, 0xA1,
+ 0xD6, 0x3F, 0xF7, 0x99, 0xD6, 0xE4, 0x8F, 0x6B, 0x26, 0xEB, 0x70, 0x84,
+ 0x86, 0x20, 0xDD, 0x4C, 0xC1, 0x5D, 0x25, 0xF0, 0xE6, 0x38, 0x2D, 0x4D,
+ 0xC9, 0xEF, 0xBA, 0x3E, 0x3F, 0x6B, 0x68, 0x09, 0x5E, 0xCC, 0x1E, 0x02,
+ 0xC6, 0xE9, 0x82, 0x63, 0x86, 0xE2, 0xA0, 0x52, 0x84, 0x35, 0x7F, 0x68,
+ 0xA1, 0x70, 0x6A, 0x6B, 0x14, 0x18, 0x97, 0x3C, 0x5C, 0xAE, 0xDE, 0x7F,
+ 0x1C, 0x84, 0x07, 0x3E, 0x37, 0x07, 0x50, 0xAA, 0x05, 0x53, 0x9C, 0xB7,
+ 0x0D, 0x0C, 0x50, 0xF0, 0x37, 0xDA, 0x3A, 0xB0, 0xB8, 0xF2, 0x16, 0x57,
+ 0xEC, 0x44, 0x7D, 0x8E, 0xB2, 0x74, 0xB5, 0x3C, 0x1A, 0xF5, 0x0C, 0xAE,
+ 0xFF, 0xB3, 0x00, 0x02, 0x04, 0x1F, 0x1C, 0xF0, 0xF6, 0x2F, 0xA9, 0x7C,
+ 0xF9, 0x13, 0x91, 0xD1, 0xBD, 0x21, 0x09, 0xDC, 0x58, 0x7A, 0x83, 0x25,
+ 0xDC, 0xDA, 0xC2, 0x37, 0x81, 0xE5, 0xE5, 0x3A, 0x01, 0x47, 0xF5, 0x22,
+ 0x73, 0x47, 0x32, 0x94, 0x0E, 0x03, 0xD0, 0x0F, 0x46, 0x61, 0x44, 0xA9,
+ 0xA7, 0xDD, 0xF3, 0x9A, 0x34, 0x76, 0xB5, 0xC8, 0x2F, 0x0E, 0xEA, 0x3B,
+ 0x99, 0xCD, 0x38, 0xE2, 0x41, 0x1E, 0x75, 0xA4, 0x3E, 0xC7, 0xC8, 0xEC,
+ 0x08, 0xB9, 0x6D, 0x4F, 0x38, 0x8B, 0x54, 0x4E, 0x31, 0xB3, 0x3E, 0x18,
+ 0xA1, 0xBB, 0x80, 0x32, 0x79, 0x7C, 0x97, 0x24, 0x90, 0x12, 0xB8, 0x2C,
+ 0xBF, 0x04, 0x0A, 0xF6, 0x03, 0x0D, 0x42, 0x6F, 0x10, 0x08, 0x93, 0xD9,
+ 0x1F, 0x77, 0x9A, 0xDE, 0xAF, 0x89, 0xAF, 0xBC, 0x72, 0xB0, 0x79, 0x56,
+ 0x24, 0x71, 0x6B, 0x2E, 0x1F, 0x72, 0x12, 0x55, 0x2E, 0x3F, 0xCF, 0xDC,
+ 0x12, 0xAE, 0x8B, 0xB3, 0x17, 0xDA, 0x08, 0x74, 0x18, 0x47, 0x58, 0x7A,
+ 0x87, 0xCD, 0x84, 0x9F, 0xE6, 0xDD, 0x1A, 0x50, 0xFA, 0x1D, 0x85, 0xDB,
+ 0x3A, 0xEC, 0x7A, 0xEC, 0x8C, 0x7D, 0x4B, 0xE9, 0xBC, 0x9A, 0x9F, 0xBC,
+ 0x08, 0xD8, 0x15, 0x32, 0x47, 0x18, 0x1C, 0xEF, 0xD2, 0xC3, 0x64, 0xC4,
+ 0x66, 0x43, 0x09, 0x63, 0x51, 0xC4, 0x65, 0x2A, 0x43, 0x4D, 0xA1, 0x12,
+ 0x16, 0xBA, 0xC2, 0x24, 0x37, 0x3B, 0x43, 0xDD, 0x55, 0x4E, 0x31, 0x10,
+ 0x9E, 0xF8, 0xDF, 0x71, 0xDD, 0xE4, 0x3A, 0x13, 0x02, 0x00, 0x94, 0x50,
+ 0x6B, 0xC7, 0xA3, 0xD7, 0xF1, 0x56, 0x35, 0x04, 0x9B, 0x19, 0x11, 0x5F,
+ 0xD6, 0x77, 0xAC, 0x81, 0xFA, 0xFB, 0xF1, 0x97, 0xED, 0xE6, 0x8F, 0xF2,
+ 0x09, 0xA5, 0x24, 0x59, 0x3B, 0x18, 0x11, 0x3C, 0xB1, 0x6F, 0xE9, 0xEA,
+ 0x70, 0x45, 0xE3, 0x86, 0x6E, 0x3C, 0x15, 0x1E, 0x2C, 0xBF, 0xBA, 0x9E,
+ 0xFA, 0x06, 0x3D, 0x4E, 0x1C, 0xE7, 0x1F, 0x77, 0xB3, 0x2A, 0x3E, 0x5A,
+ 0x0A, 0x5E, 0x0E, 0x86, 0x25, 0xC8, 0x66, 0x52, 0xD6, 0x89, 0x3E, 0x80,
+ 0x0F, 0x1D, 0xE7, 0x99, 0xB9, 0xDC, 0x65, 0x29, 0x78, 0xEA, 0xE2, 0x94,
+ 0xBA, 0x0E, 0x15, 0xC6, 0x6A, 0xB3, 0x10, 0x9C, 0x78, 0xC9, 0x4C, 0x2E,
+ 0x3D, 0x2B, 0x1D, 0x36, 0xA7, 0x4E, 0xF7, 0xF2, 0xF4, 0x2D, 0x0A, 0x1E,
+ 0x53, 0x3C, 0xFC, 0xA6, 0xB6, 0x12, 0x13, 0xF7, 0x08, 0xA7, 0x23, 0x52,
+ 0x60, 0x79, 0xC2, 0x19, 0x0F, 0x26, 0x39, 0x19, 0x83, 0xC8, 0x7B, 0xA6,
+ 0x95, 0x45, 0xBC, 0xE3, 0x66, 0x1F, 0xC3, 0xEA, 0x6E, 0xFE, 0xAD, 0xEB,
+ 0xA5, 0x5A, 0x6C, 0xBE, 0xEF, 0xDD, 0x32, 0xC3, 0x28, 0xFF, 0x8C, 0x01,
+ 0xD1, 0x37, 0x7F, 0xB1, 0x3B, 0x95, 0x2F, 0xDB, 0x0F, 0xA5, 0xCE, 0xEE,
+ 0x02, 0x97, 0xAB, 0x68, 0x85, 0x21, 0x58, 0x65, 0x70, 0x61, 0x07, 0x29,
+ 0x28, 0xB6, 0x21, 0x15, 0x84, 0x2F, 0x6E, 0x5B, 0xAD, 0x7D, 0xEF, 0x2A,
+ 0x96, 0xBD, 0x61, 0xEB, 0x30, 0xA8, 0xCC, 0x13, 0x10, 0x15, 0x9F, 0x61,
+ 0x75, 0x47, 0xDD, 0xEC, 0x39, 0xA2, 0x70, 0x4C, 0x90, 0x5C, 0x73, 0xB5,
+ 0xCF, 0x63, 0x03, 0xAA, 0x1E, 0xFE, 0x34, 0x03, 0xA7, 0x2C, 0x62, 0x60,
+ 0xBC, 0x86, 0xCC, 0xEE, 0x14, 0xDE, 0xAA, 0xCB, 0x0B, 0x9E, 0x9E, 0xD5,
+ 0xCA, 0xF0, 0xBD, 0x19, 0xAF, 0x1E, 0x8B, 0x64, 0x6E, 0x84, 0xF3, 0xB2,
+ 0xAB, 0x5C, 0xAB, 0x9C, 0xB3, 0xB4, 0x2A, 0x3C, 0x32, 0x5A, 0x68, 0x40,
+ 0x50, 0xBB, 0x5A, 0x65, 0xB9, 0x69, 0x23, 0xA0, 0x99, 0xA0, 0x5F, 0x87,
+ 0x19, 0x0B, 0x54, 0x9B, 0xF7, 0xB8, 0x21, 0xC0, 0xD5, 0xE9, 0x9E, 0x31,
+ 0x77, 0x2D, 0xE3, 0x97, 0x9A, 0x88, 0x37, 0xF8, 0xA8, 0x7D, 0x3D, 0x62,
+ 0x7E, 0x99, 0xF7, 0x95, 0xD6, 0x1F, 0xE6, 0xC7, 0x29, 0x88, 0x35, 0x0E,
+ 0x81, 0x12, 0x68, 0x16, 0x5F, 0x93, 0xED, 0x11, 0x63, 0x72, 0x22, 0x1B,
+ 0xA5, 0x84, 0xF5, 0x57, 0x99, 0xBA, 0x58, 0x78, 0xA1, 0xDF, 0xDE, 0x96,
+ 0x54, 0x30, 0x2E, 0x53, 0xEB, 0x0A, 0xB3, 0xCD, 0x96, 0x46, 0xC2, 0x1A,
+ 0xFF, 0xC3, 0x83, 0x9B, 0xEA, 0xFF, 0xC6, 0x34, 0xEF, 0xF2, 0xEB, 0x58,
+ 0x28, 0x31, 0xBC, 0x6D, 0xE4, 0x48, 0xD9, 0x8F, 0xE3, 0xB7, 0x64, 0xE8,
+ 0xD9, 0x14, 0x4A, 0x5D, 0x73, 0x3C, 0x7C, 0xEE, 0x61, 0xED, 0x28, 0xFE,
+ 0xEA, 0xAB, 0xAA, 0xA3, 0xB6, 0xE2, 0xEE, 0x45, 0xE0, 0x13, 0x3E, 0x20,
+ 0x14, 0x5D, 0x10, 0x42, 0xB5, 0xBB, 0x6A, 0xEF, 0x42, 0xF4, 0x42, 0xC7,
+ 0xD0, 0x4F, 0xCB, 0xFA, 0x15, 0x4F, 0x6C, 0xDB, 0xC7, 0x4D, 0x85, 0x86,
+ 0x9E, 0x79, 0x1E, 0xD8, 0x05, 0x21, 0xCD, 0x41, 0x1D, 0x3B, 0x4F, 0x65,
+ 0x46, 0x26, 0x8D, 0x5B, 0xF2, 0xA1, 0x62, 0xCF, 0x50, 0x62, 0x81, 0x3D,
+ 0x6A, 0x47, 0x4B, 0xE4, 0x92, 0x74, 0xCB, 0x69, 0xC3, 0x24, 0x15, 0x7F,
+ 0xA3, 0xB6, 0xC7, 0xC1, 0xA0, 0x83, 0x88, 0xFC, 0x9D, 0x48, 0x19, 0xAD,
+ 0x00, 0xBF, 0x5B, 0x09, 0x85, 0xB2, 0x92, 0x56, 0x0B, 0x8A, 0x84, 0x47,
+ 0xEA, 0xF5, 0x55, 0x0C, 0x2A, 0x8D, 0x42, 0x58, 0x00, 0x0D, 0x82, 0x23,
+ 0x74, 0xB1, 0x62, 0x14, 0x41, 0x7E, 0x93, 0x8D, 0x92, 0xF0, 0x72, 0x33,
+ 0x61, 0x70, 0x3F, 0x23, 0x3E, 0xF4, 0xAD, 0x1D, 0x60, 0x74, 0xEE, 0xCB,
+ 0x59, 0x37, 0xDE, 0x7C, 0xDB, 0x3B, 0x22, 0x6C, 0xF1, 0xEC, 0x5F, 0xD6,
+ 0x9E, 0x50, 0xF8, 0x19, 0x84, 0x80, 0x07, 0xA6, 0x6E, 0x32, 0x77, 0xCE,
+ 0xA7, 0xF2, 0x85, 0x40, 0xC2, 0x06, 0x0C, 0xC5, 0xAA, 0xA7, 0x69, 0xA9,
+ 0x35, 0x97, 0xD9, 0x61, 0x55, 0xD8, 0xEF, 0xE8, 0x84, 0x34, 0x45, 0xC3,
+ 0x2E, 0x7A, 0x44, 0x9E, 0xDC, 0xCA, 0x0B, 0x80, 0xFC, 0xAB, 0x04, 0x5A,
+ 0xCD, 0x88, 0x55, 0x10, 0xD3, 0xDB, 0x73, 0xDB, 0xC9, 0x9E, 0x1E, 0x0E,
+ 0x05, 0x67, 0xD5, 0xFD, 0xD8, 0x38, 0x3E, 0x71, 0x65, 0x34, 0xC4, 0xC5,
+ 0x40, 0x43, 0x67, 0xE3, 0x79, 0xDA, 0x5F, 0x67, 0x4A, 0x3D, 0xB0, 0x8F,
+ 0xE7, 0x21, 0x3E, 0x15, 0x20, 0xFF, 0x6D, 0xF1, 0x9E, 0xF8, 0x28, 0x3D,
+ 0xF7, 0x40, 0x81, 0x94, 0x68, 0x5A, 0x3D, 0xE9, 0xF7, 0xAD, 0x83, 0xDB,
+ 0x2B, 0x9F, 0xE3, 0xE6, 0xF7, 0xD4, 0x02, 0x76, 0xF7, 0x20, 0x15, 0x41,
+ 0x34, 0x29, 0x69, 0x94, 0x1C, 0x26, 0x4C, 0xF6, 0x6A, 0xF4, 0x20, 0x33,
+ 0x71, 0x24, 0x08, 0xD4, 0x68, 0x00, 0xA1, 0xD4, 0x2E, 0x6B, 0xF4, 0xBC,
+ 0x46, 0x45, 0x24, 0x97, 0x2E, 0xF6, 0x39, 0x1E, 0xAF, 0x61, 0x00, 0x50,
+ 0xB7, 0xD4, 0xB7, 0x43,
+};
+
+} // namespace random_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/random/internal/randen_slow.cc b/third_party/abseil/src/absl/random/internal/randen_slow.cc
new file mode 100644
index 0000000..4e5f3dc
--- /dev/null
+++ b/third_party/abseil/src/absl/random/internal/randen_slow.cc
@@ -0,0 +1,457 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/random/internal/randen_slow.h"
+
+#include <cstddef>
+#include <cstdint>
+#include <cstring>
+
+#include "absl/base/attributes.h"
+#include "absl/random/internal/platform.h"
+#include "absl/random/internal/randen_traits.h"
+
+#if ABSL_HAVE_ATTRIBUTE(always_inline) || \
+ (defined(__GNUC__) && !defined(__clang__))
+#define ABSL_RANDOM_INTERNAL_ATTRIBUTE_ALWAYS_INLINE \
+ __attribute__((always_inline))
+#elif defined(_MSC_VER)
+// We can achieve something similar to attribute((always_inline)) with MSVC by
+// using the __forceinline keyword, however this is not perfect. MSVC is
+// much less aggressive about inlining, and even with the __forceinline keyword.
+#define ABSL_RANDOM_INTERNAL_ATTRIBUTE_ALWAYS_INLINE __forceinline
+#else
+#define ABSL_RANDOM_INTERNAL_ATTRIBUTE_ALWAYS_INLINE
+#endif
+
+namespace {
+
+// AES portions based on rijndael-alg-fst.c,
+// https://fastcrypto.org/front/misc/rijndael-alg-fst.c
+//
+// Implementation of
+// http://www.csrc.nist.gov/publications/fips/fips197/fips-197.pdf
+constexpr uint32_t te0[256] = {
+ 0xc66363a5, 0xf87c7c84, 0xee777799, 0xf67b7b8d, 0xfff2f20d, 0xd66b6bbd,
+ 0xde6f6fb1, 0x91c5c554, 0x60303050, 0x02010103, 0xce6767a9, 0x562b2b7d,
+ 0xe7fefe19, 0xb5d7d762, 0x4dababe6, 0xec76769a, 0x8fcaca45, 0x1f82829d,
+ 0x89c9c940, 0xfa7d7d87, 0xeffafa15, 0xb25959eb, 0x8e4747c9, 0xfbf0f00b,
+ 0x41adadec, 0xb3d4d467, 0x5fa2a2fd, 0x45afafea, 0x239c9cbf, 0x53a4a4f7,
+ 0xe4727296, 0x9bc0c05b, 0x75b7b7c2, 0xe1fdfd1c, 0x3d9393ae, 0x4c26266a,
+ 0x6c36365a, 0x7e3f3f41, 0xf5f7f702, 0x83cccc4f, 0x6834345c, 0x51a5a5f4,
+ 0xd1e5e534, 0xf9f1f108, 0xe2717193, 0xabd8d873, 0x62313153, 0x2a15153f,
+ 0x0804040c, 0x95c7c752, 0x46232365, 0x9dc3c35e, 0x30181828, 0x379696a1,
+ 0x0a05050f, 0x2f9a9ab5, 0x0e070709, 0x24121236, 0x1b80809b, 0xdfe2e23d,
+ 0xcdebeb26, 0x4e272769, 0x7fb2b2cd, 0xea75759f, 0x1209091b, 0x1d83839e,
+ 0x582c2c74, 0x341a1a2e, 0x361b1b2d, 0xdc6e6eb2, 0xb45a5aee, 0x5ba0a0fb,
+ 0xa45252f6, 0x763b3b4d, 0xb7d6d661, 0x7db3b3ce, 0x5229297b, 0xdde3e33e,
+ 0x5e2f2f71, 0x13848497, 0xa65353f5, 0xb9d1d168, 0x00000000, 0xc1eded2c,
+ 0x40202060, 0xe3fcfc1f, 0x79b1b1c8, 0xb65b5bed, 0xd46a6abe, 0x8dcbcb46,
+ 0x67bebed9, 0x7239394b, 0x944a4ade, 0x984c4cd4, 0xb05858e8, 0x85cfcf4a,
+ 0xbbd0d06b, 0xc5efef2a, 0x4faaaae5, 0xedfbfb16, 0x864343c5, 0x9a4d4dd7,
+ 0x66333355, 0x11858594, 0x8a4545cf, 0xe9f9f910, 0x04020206, 0xfe7f7f81,
+ 0xa05050f0, 0x783c3c44, 0x259f9fba, 0x4ba8a8e3, 0xa25151f3, 0x5da3a3fe,
+ 0x804040c0, 0x058f8f8a, 0x3f9292ad, 0x219d9dbc, 0x70383848, 0xf1f5f504,
+ 0x63bcbcdf, 0x77b6b6c1, 0xafdada75, 0x42212163, 0x20101030, 0xe5ffff1a,
+ 0xfdf3f30e, 0xbfd2d26d, 0x81cdcd4c, 0x180c0c14, 0x26131335, 0xc3ecec2f,
+ 0xbe5f5fe1, 0x359797a2, 0x884444cc, 0x2e171739, 0x93c4c457, 0x55a7a7f2,
+ 0xfc7e7e82, 0x7a3d3d47, 0xc86464ac, 0xba5d5de7, 0x3219192b, 0xe6737395,
+ 0xc06060a0, 0x19818198, 0x9e4f4fd1, 0xa3dcdc7f, 0x44222266, 0x542a2a7e,
+ 0x3b9090ab, 0x0b888883, 0x8c4646ca, 0xc7eeee29, 0x6bb8b8d3, 0x2814143c,
+ 0xa7dede79, 0xbc5e5ee2, 0x160b0b1d, 0xaddbdb76, 0xdbe0e03b, 0x64323256,
+ 0x743a3a4e, 0x140a0a1e, 0x924949db, 0x0c06060a, 0x4824246c, 0xb85c5ce4,
+ 0x9fc2c25d, 0xbdd3d36e, 0x43acacef, 0xc46262a6, 0x399191a8, 0x319595a4,
+ 0xd3e4e437, 0xf279798b, 0xd5e7e732, 0x8bc8c843, 0x6e373759, 0xda6d6db7,
+ 0x018d8d8c, 0xb1d5d564, 0x9c4e4ed2, 0x49a9a9e0, 0xd86c6cb4, 0xac5656fa,
+ 0xf3f4f407, 0xcfeaea25, 0xca6565af, 0xf47a7a8e, 0x47aeaee9, 0x10080818,
+ 0x6fbabad5, 0xf0787888, 0x4a25256f, 0x5c2e2e72, 0x381c1c24, 0x57a6a6f1,
+ 0x73b4b4c7, 0x97c6c651, 0xcbe8e823, 0xa1dddd7c, 0xe874749c, 0x3e1f1f21,
+ 0x964b4bdd, 0x61bdbddc, 0x0d8b8b86, 0x0f8a8a85, 0xe0707090, 0x7c3e3e42,
+ 0x71b5b5c4, 0xcc6666aa, 0x904848d8, 0x06030305, 0xf7f6f601, 0x1c0e0e12,
+ 0xc26161a3, 0x6a35355f, 0xae5757f9, 0x69b9b9d0, 0x17868691, 0x99c1c158,
+ 0x3a1d1d27, 0x279e9eb9, 0xd9e1e138, 0xebf8f813, 0x2b9898b3, 0x22111133,
+ 0xd26969bb, 0xa9d9d970, 0x078e8e89, 0x339494a7, 0x2d9b9bb6, 0x3c1e1e22,
+ 0x15878792, 0xc9e9e920, 0x87cece49, 0xaa5555ff, 0x50282878, 0xa5dfdf7a,
+ 0x038c8c8f, 0x59a1a1f8, 0x09898980, 0x1a0d0d17, 0x65bfbfda, 0xd7e6e631,
+ 0x844242c6, 0xd06868b8, 0x824141c3, 0x299999b0, 0x5a2d2d77, 0x1e0f0f11,
+ 0x7bb0b0cb, 0xa85454fc, 0x6dbbbbd6, 0x2c16163a,
+};
+
+constexpr uint32_t te1[256] = {
+ 0xa5c66363, 0x84f87c7c, 0x99ee7777, 0x8df67b7b, 0x0dfff2f2, 0xbdd66b6b,
+ 0xb1de6f6f, 0x5491c5c5, 0x50603030, 0x03020101, 0xa9ce6767, 0x7d562b2b,
+ 0x19e7fefe, 0x62b5d7d7, 0xe64dabab, 0x9aec7676, 0x458fcaca, 0x9d1f8282,
+ 0x4089c9c9, 0x87fa7d7d, 0x15effafa, 0xebb25959, 0xc98e4747, 0x0bfbf0f0,
+ 0xec41adad, 0x67b3d4d4, 0xfd5fa2a2, 0xea45afaf, 0xbf239c9c, 0xf753a4a4,
+ 0x96e47272, 0x5b9bc0c0, 0xc275b7b7, 0x1ce1fdfd, 0xae3d9393, 0x6a4c2626,
+ 0x5a6c3636, 0x417e3f3f, 0x02f5f7f7, 0x4f83cccc, 0x5c683434, 0xf451a5a5,
+ 0x34d1e5e5, 0x08f9f1f1, 0x93e27171, 0x73abd8d8, 0x53623131, 0x3f2a1515,
+ 0x0c080404, 0x5295c7c7, 0x65462323, 0x5e9dc3c3, 0x28301818, 0xa1379696,
+ 0x0f0a0505, 0xb52f9a9a, 0x090e0707, 0x36241212, 0x9b1b8080, 0x3ddfe2e2,
+ 0x26cdebeb, 0x694e2727, 0xcd7fb2b2, 0x9fea7575, 0x1b120909, 0x9e1d8383,
+ 0x74582c2c, 0x2e341a1a, 0x2d361b1b, 0xb2dc6e6e, 0xeeb45a5a, 0xfb5ba0a0,
+ 0xf6a45252, 0x4d763b3b, 0x61b7d6d6, 0xce7db3b3, 0x7b522929, 0x3edde3e3,
+ 0x715e2f2f, 0x97138484, 0xf5a65353, 0x68b9d1d1, 0x00000000, 0x2cc1eded,
+ 0x60402020, 0x1fe3fcfc, 0xc879b1b1, 0xedb65b5b, 0xbed46a6a, 0x468dcbcb,
+ 0xd967bebe, 0x4b723939, 0xde944a4a, 0xd4984c4c, 0xe8b05858, 0x4a85cfcf,
+ 0x6bbbd0d0, 0x2ac5efef, 0xe54faaaa, 0x16edfbfb, 0xc5864343, 0xd79a4d4d,
+ 0x55663333, 0x94118585, 0xcf8a4545, 0x10e9f9f9, 0x06040202, 0x81fe7f7f,
+ 0xf0a05050, 0x44783c3c, 0xba259f9f, 0xe34ba8a8, 0xf3a25151, 0xfe5da3a3,
+ 0xc0804040, 0x8a058f8f, 0xad3f9292, 0xbc219d9d, 0x48703838, 0x04f1f5f5,
+ 0xdf63bcbc, 0xc177b6b6, 0x75afdada, 0x63422121, 0x30201010, 0x1ae5ffff,
+ 0x0efdf3f3, 0x6dbfd2d2, 0x4c81cdcd, 0x14180c0c, 0x35261313, 0x2fc3ecec,
+ 0xe1be5f5f, 0xa2359797, 0xcc884444, 0x392e1717, 0x5793c4c4, 0xf255a7a7,
+ 0x82fc7e7e, 0x477a3d3d, 0xacc86464, 0xe7ba5d5d, 0x2b321919, 0x95e67373,
+ 0xa0c06060, 0x98198181, 0xd19e4f4f, 0x7fa3dcdc, 0x66442222, 0x7e542a2a,
+ 0xab3b9090, 0x830b8888, 0xca8c4646, 0x29c7eeee, 0xd36bb8b8, 0x3c281414,
+ 0x79a7dede, 0xe2bc5e5e, 0x1d160b0b, 0x76addbdb, 0x3bdbe0e0, 0x56643232,
+ 0x4e743a3a, 0x1e140a0a, 0xdb924949, 0x0a0c0606, 0x6c482424, 0xe4b85c5c,
+ 0x5d9fc2c2, 0x6ebdd3d3, 0xef43acac, 0xa6c46262, 0xa8399191, 0xa4319595,
+ 0x37d3e4e4, 0x8bf27979, 0x32d5e7e7, 0x438bc8c8, 0x596e3737, 0xb7da6d6d,
+ 0x8c018d8d, 0x64b1d5d5, 0xd29c4e4e, 0xe049a9a9, 0xb4d86c6c, 0xfaac5656,
+ 0x07f3f4f4, 0x25cfeaea, 0xafca6565, 0x8ef47a7a, 0xe947aeae, 0x18100808,
+ 0xd56fbaba, 0x88f07878, 0x6f4a2525, 0x725c2e2e, 0x24381c1c, 0xf157a6a6,
+ 0xc773b4b4, 0x5197c6c6, 0x23cbe8e8, 0x7ca1dddd, 0x9ce87474, 0x213e1f1f,
+ 0xdd964b4b, 0xdc61bdbd, 0x860d8b8b, 0x850f8a8a, 0x90e07070, 0x427c3e3e,
+ 0xc471b5b5, 0xaacc6666, 0xd8904848, 0x05060303, 0x01f7f6f6, 0x121c0e0e,
+ 0xa3c26161, 0x5f6a3535, 0xf9ae5757, 0xd069b9b9, 0x91178686, 0x5899c1c1,
+ 0x273a1d1d, 0xb9279e9e, 0x38d9e1e1, 0x13ebf8f8, 0xb32b9898, 0x33221111,
+ 0xbbd26969, 0x70a9d9d9, 0x89078e8e, 0xa7339494, 0xb62d9b9b, 0x223c1e1e,
+ 0x92158787, 0x20c9e9e9, 0x4987cece, 0xffaa5555, 0x78502828, 0x7aa5dfdf,
+ 0x8f038c8c, 0xf859a1a1, 0x80098989, 0x171a0d0d, 0xda65bfbf, 0x31d7e6e6,
+ 0xc6844242, 0xb8d06868, 0xc3824141, 0xb0299999, 0x775a2d2d, 0x111e0f0f,
+ 0xcb7bb0b0, 0xfca85454, 0xd66dbbbb, 0x3a2c1616,
+};
+
+constexpr uint32_t te2[256] = {
+ 0x63a5c663, 0x7c84f87c, 0x7799ee77, 0x7b8df67b, 0xf20dfff2, 0x6bbdd66b,
+ 0x6fb1de6f, 0xc55491c5, 0x30506030, 0x01030201, 0x67a9ce67, 0x2b7d562b,
+ 0xfe19e7fe, 0xd762b5d7, 0xabe64dab, 0x769aec76, 0xca458fca, 0x829d1f82,
+ 0xc94089c9, 0x7d87fa7d, 0xfa15effa, 0x59ebb259, 0x47c98e47, 0xf00bfbf0,
+ 0xadec41ad, 0xd467b3d4, 0xa2fd5fa2, 0xafea45af, 0x9cbf239c, 0xa4f753a4,
+ 0x7296e472, 0xc05b9bc0, 0xb7c275b7, 0xfd1ce1fd, 0x93ae3d93, 0x266a4c26,
+ 0x365a6c36, 0x3f417e3f, 0xf702f5f7, 0xcc4f83cc, 0x345c6834, 0xa5f451a5,
+ 0xe534d1e5, 0xf108f9f1, 0x7193e271, 0xd873abd8, 0x31536231, 0x153f2a15,
+ 0x040c0804, 0xc75295c7, 0x23654623, 0xc35e9dc3, 0x18283018, 0x96a13796,
+ 0x050f0a05, 0x9ab52f9a, 0x07090e07, 0x12362412, 0x809b1b80, 0xe23ddfe2,
+ 0xeb26cdeb, 0x27694e27, 0xb2cd7fb2, 0x759fea75, 0x091b1209, 0x839e1d83,
+ 0x2c74582c, 0x1a2e341a, 0x1b2d361b, 0x6eb2dc6e, 0x5aeeb45a, 0xa0fb5ba0,
+ 0x52f6a452, 0x3b4d763b, 0xd661b7d6, 0xb3ce7db3, 0x297b5229, 0xe33edde3,
+ 0x2f715e2f, 0x84971384, 0x53f5a653, 0xd168b9d1, 0x00000000, 0xed2cc1ed,
+ 0x20604020, 0xfc1fe3fc, 0xb1c879b1, 0x5bedb65b, 0x6abed46a, 0xcb468dcb,
+ 0xbed967be, 0x394b7239, 0x4ade944a, 0x4cd4984c, 0x58e8b058, 0xcf4a85cf,
+ 0xd06bbbd0, 0xef2ac5ef, 0xaae54faa, 0xfb16edfb, 0x43c58643, 0x4dd79a4d,
+ 0x33556633, 0x85941185, 0x45cf8a45, 0xf910e9f9, 0x02060402, 0x7f81fe7f,
+ 0x50f0a050, 0x3c44783c, 0x9fba259f, 0xa8e34ba8, 0x51f3a251, 0xa3fe5da3,
+ 0x40c08040, 0x8f8a058f, 0x92ad3f92, 0x9dbc219d, 0x38487038, 0xf504f1f5,
+ 0xbcdf63bc, 0xb6c177b6, 0xda75afda, 0x21634221, 0x10302010, 0xff1ae5ff,
+ 0xf30efdf3, 0xd26dbfd2, 0xcd4c81cd, 0x0c14180c, 0x13352613, 0xec2fc3ec,
+ 0x5fe1be5f, 0x97a23597, 0x44cc8844, 0x17392e17, 0xc45793c4, 0xa7f255a7,
+ 0x7e82fc7e, 0x3d477a3d, 0x64acc864, 0x5de7ba5d, 0x192b3219, 0x7395e673,
+ 0x60a0c060, 0x81981981, 0x4fd19e4f, 0xdc7fa3dc, 0x22664422, 0x2a7e542a,
+ 0x90ab3b90, 0x88830b88, 0x46ca8c46, 0xee29c7ee, 0xb8d36bb8, 0x143c2814,
+ 0xde79a7de, 0x5ee2bc5e, 0x0b1d160b, 0xdb76addb, 0xe03bdbe0, 0x32566432,
+ 0x3a4e743a, 0x0a1e140a, 0x49db9249, 0x060a0c06, 0x246c4824, 0x5ce4b85c,
+ 0xc25d9fc2, 0xd36ebdd3, 0xacef43ac, 0x62a6c462, 0x91a83991, 0x95a43195,
+ 0xe437d3e4, 0x798bf279, 0xe732d5e7, 0xc8438bc8, 0x37596e37, 0x6db7da6d,
+ 0x8d8c018d, 0xd564b1d5, 0x4ed29c4e, 0xa9e049a9, 0x6cb4d86c, 0x56faac56,
+ 0xf407f3f4, 0xea25cfea, 0x65afca65, 0x7a8ef47a, 0xaee947ae, 0x08181008,
+ 0xbad56fba, 0x7888f078, 0x256f4a25, 0x2e725c2e, 0x1c24381c, 0xa6f157a6,
+ 0xb4c773b4, 0xc65197c6, 0xe823cbe8, 0xdd7ca1dd, 0x749ce874, 0x1f213e1f,
+ 0x4bdd964b, 0xbddc61bd, 0x8b860d8b, 0x8a850f8a, 0x7090e070, 0x3e427c3e,
+ 0xb5c471b5, 0x66aacc66, 0x48d89048, 0x03050603, 0xf601f7f6, 0x0e121c0e,
+ 0x61a3c261, 0x355f6a35, 0x57f9ae57, 0xb9d069b9, 0x86911786, 0xc15899c1,
+ 0x1d273a1d, 0x9eb9279e, 0xe138d9e1, 0xf813ebf8, 0x98b32b98, 0x11332211,
+ 0x69bbd269, 0xd970a9d9, 0x8e89078e, 0x94a73394, 0x9bb62d9b, 0x1e223c1e,
+ 0x87921587, 0xe920c9e9, 0xce4987ce, 0x55ffaa55, 0x28785028, 0xdf7aa5df,
+ 0x8c8f038c, 0xa1f859a1, 0x89800989, 0x0d171a0d, 0xbfda65bf, 0xe631d7e6,
+ 0x42c68442, 0x68b8d068, 0x41c38241, 0x99b02999, 0x2d775a2d, 0x0f111e0f,
+ 0xb0cb7bb0, 0x54fca854, 0xbbd66dbb, 0x163a2c16,
+};
+
+constexpr uint32_t te3[256] = {
+ 0x6363a5c6, 0x7c7c84f8, 0x777799ee, 0x7b7b8df6, 0xf2f20dff, 0x6b6bbdd6,
+ 0x6f6fb1de, 0xc5c55491, 0x30305060, 0x01010302, 0x6767a9ce, 0x2b2b7d56,
+ 0xfefe19e7, 0xd7d762b5, 0xababe64d, 0x76769aec, 0xcaca458f, 0x82829d1f,
+ 0xc9c94089, 0x7d7d87fa, 0xfafa15ef, 0x5959ebb2, 0x4747c98e, 0xf0f00bfb,
+ 0xadadec41, 0xd4d467b3, 0xa2a2fd5f, 0xafafea45, 0x9c9cbf23, 0xa4a4f753,
+ 0x727296e4, 0xc0c05b9b, 0xb7b7c275, 0xfdfd1ce1, 0x9393ae3d, 0x26266a4c,
+ 0x36365a6c, 0x3f3f417e, 0xf7f702f5, 0xcccc4f83, 0x34345c68, 0xa5a5f451,
+ 0xe5e534d1, 0xf1f108f9, 0x717193e2, 0xd8d873ab, 0x31315362, 0x15153f2a,
+ 0x04040c08, 0xc7c75295, 0x23236546, 0xc3c35e9d, 0x18182830, 0x9696a137,
+ 0x05050f0a, 0x9a9ab52f, 0x0707090e, 0x12123624, 0x80809b1b, 0xe2e23ddf,
+ 0xebeb26cd, 0x2727694e, 0xb2b2cd7f, 0x75759fea, 0x09091b12, 0x83839e1d,
+ 0x2c2c7458, 0x1a1a2e34, 0x1b1b2d36, 0x6e6eb2dc, 0x5a5aeeb4, 0xa0a0fb5b,
+ 0x5252f6a4, 0x3b3b4d76, 0xd6d661b7, 0xb3b3ce7d, 0x29297b52, 0xe3e33edd,
+ 0x2f2f715e, 0x84849713, 0x5353f5a6, 0xd1d168b9, 0x00000000, 0xeded2cc1,
+ 0x20206040, 0xfcfc1fe3, 0xb1b1c879, 0x5b5bedb6, 0x6a6abed4, 0xcbcb468d,
+ 0xbebed967, 0x39394b72, 0x4a4ade94, 0x4c4cd498, 0x5858e8b0, 0xcfcf4a85,
+ 0xd0d06bbb, 0xefef2ac5, 0xaaaae54f, 0xfbfb16ed, 0x4343c586, 0x4d4dd79a,
+ 0x33335566, 0x85859411, 0x4545cf8a, 0xf9f910e9, 0x02020604, 0x7f7f81fe,
+ 0x5050f0a0, 0x3c3c4478, 0x9f9fba25, 0xa8a8e34b, 0x5151f3a2, 0xa3a3fe5d,
+ 0x4040c080, 0x8f8f8a05, 0x9292ad3f, 0x9d9dbc21, 0x38384870, 0xf5f504f1,
+ 0xbcbcdf63, 0xb6b6c177, 0xdada75af, 0x21216342, 0x10103020, 0xffff1ae5,
+ 0xf3f30efd, 0xd2d26dbf, 0xcdcd4c81, 0x0c0c1418, 0x13133526, 0xecec2fc3,
+ 0x5f5fe1be, 0x9797a235, 0x4444cc88, 0x1717392e, 0xc4c45793, 0xa7a7f255,
+ 0x7e7e82fc, 0x3d3d477a, 0x6464acc8, 0x5d5de7ba, 0x19192b32, 0x737395e6,
+ 0x6060a0c0, 0x81819819, 0x4f4fd19e, 0xdcdc7fa3, 0x22226644, 0x2a2a7e54,
+ 0x9090ab3b, 0x8888830b, 0x4646ca8c, 0xeeee29c7, 0xb8b8d36b, 0x14143c28,
+ 0xdede79a7, 0x5e5ee2bc, 0x0b0b1d16, 0xdbdb76ad, 0xe0e03bdb, 0x32325664,
+ 0x3a3a4e74, 0x0a0a1e14, 0x4949db92, 0x06060a0c, 0x24246c48, 0x5c5ce4b8,
+ 0xc2c25d9f, 0xd3d36ebd, 0xacacef43, 0x6262a6c4, 0x9191a839, 0x9595a431,
+ 0xe4e437d3, 0x79798bf2, 0xe7e732d5, 0xc8c8438b, 0x3737596e, 0x6d6db7da,
+ 0x8d8d8c01, 0xd5d564b1, 0x4e4ed29c, 0xa9a9e049, 0x6c6cb4d8, 0x5656faac,
+ 0xf4f407f3, 0xeaea25cf, 0x6565afca, 0x7a7a8ef4, 0xaeaee947, 0x08081810,
+ 0xbabad56f, 0x787888f0, 0x25256f4a, 0x2e2e725c, 0x1c1c2438, 0xa6a6f157,
+ 0xb4b4c773, 0xc6c65197, 0xe8e823cb, 0xdddd7ca1, 0x74749ce8, 0x1f1f213e,
+ 0x4b4bdd96, 0xbdbddc61, 0x8b8b860d, 0x8a8a850f, 0x707090e0, 0x3e3e427c,
+ 0xb5b5c471, 0x6666aacc, 0x4848d890, 0x03030506, 0xf6f601f7, 0x0e0e121c,
+ 0x6161a3c2, 0x35355f6a, 0x5757f9ae, 0xb9b9d069, 0x86869117, 0xc1c15899,
+ 0x1d1d273a, 0x9e9eb927, 0xe1e138d9, 0xf8f813eb, 0x9898b32b, 0x11113322,
+ 0x6969bbd2, 0xd9d970a9, 0x8e8e8907, 0x9494a733, 0x9b9bb62d, 0x1e1e223c,
+ 0x87879215, 0xe9e920c9, 0xcece4987, 0x5555ffaa, 0x28287850, 0xdfdf7aa5,
+ 0x8c8c8f03, 0xa1a1f859, 0x89898009, 0x0d0d171a, 0xbfbfda65, 0xe6e631d7,
+ 0x4242c684, 0x6868b8d0, 0x4141c382, 0x9999b029, 0x2d2d775a, 0x0f0f111e,
+ 0xb0b0cb7b, 0x5454fca8, 0xbbbbd66d, 0x16163a2c,
+};
+
+// Software implementation of the Vector128 class, using uint32_t
+// as an underlying vector register.
+struct alignas(16) Vector128 {
+ uint32_t s[4];
+};
+
+inline ABSL_RANDOM_INTERNAL_ATTRIBUTE_ALWAYS_INLINE Vector128
+Vector128Load(const void* from) {
+ Vector128 result;
+ const uint8_t* src = reinterpret_cast<const uint8_t*>(from);
+ result.s[0] = static_cast<uint32_t>(src[0]) << 24 |
+ static_cast<uint32_t>(src[1]) << 16 |
+ static_cast<uint32_t>(src[2]) << 8 |
+ static_cast<uint32_t>(src[3]);
+ result.s[1] = static_cast<uint32_t>(src[4]) << 24 |
+ static_cast<uint32_t>(src[5]) << 16 |
+ static_cast<uint32_t>(src[6]) << 8 |
+ static_cast<uint32_t>(src[7]);
+ result.s[2] = static_cast<uint32_t>(src[8]) << 24 |
+ static_cast<uint32_t>(src[9]) << 16 |
+ static_cast<uint32_t>(src[10]) << 8 |
+ static_cast<uint32_t>(src[11]);
+ result.s[3] = static_cast<uint32_t>(src[12]) << 24 |
+ static_cast<uint32_t>(src[13]) << 16 |
+ static_cast<uint32_t>(src[14]) << 8 |
+ static_cast<uint32_t>(src[15]);
+ return result;
+}
+
+inline ABSL_RANDOM_INTERNAL_ATTRIBUTE_ALWAYS_INLINE void Vector128Store(
+ const Vector128& v, void* to) {
+ uint8_t* dst = reinterpret_cast<uint8_t*>(to);
+ dst[0] = static_cast<uint8_t>(v.s[0] >> 24);
+ dst[1] = static_cast<uint8_t>(v.s[0] >> 16);
+ dst[2] = static_cast<uint8_t>(v.s[0] >> 8);
+ dst[3] = static_cast<uint8_t>(v.s[0]);
+ dst[4] = static_cast<uint8_t>(v.s[1] >> 24);
+ dst[5] = static_cast<uint8_t>(v.s[1] >> 16);
+ dst[6] = static_cast<uint8_t>(v.s[1] >> 8);
+ dst[7] = static_cast<uint8_t>(v.s[1]);
+ dst[8] = static_cast<uint8_t>(v.s[2] >> 24);
+ dst[9] = static_cast<uint8_t>(v.s[2] >> 16);
+ dst[10] = static_cast<uint8_t>(v.s[2] >> 8);
+ dst[11] = static_cast<uint8_t>(v.s[2]);
+ dst[12] = static_cast<uint8_t>(v.s[3] >> 24);
+ dst[13] = static_cast<uint8_t>(v.s[3] >> 16);
+ dst[14] = static_cast<uint8_t>(v.s[3] >> 8);
+ dst[15] = static_cast<uint8_t>(v.s[3]);
+}
+
+// One round of AES. "round_key" is a public constant for breaking the
+// symmetry of AES (ensures previously equal columns differ afterwards).
+inline ABSL_RANDOM_INTERNAL_ATTRIBUTE_ALWAYS_INLINE Vector128
+AesRound(const Vector128& state, const Vector128& round_key) {
+ Vector128 result;
+ result.s[0] = round_key.s[0] ^ //
+ te0[uint8_t(state.s[0] >> 24)] ^ //
+ te1[uint8_t(state.s[1] >> 16)] ^ //
+ te2[uint8_t(state.s[2] >> 8)] ^ //
+ te3[uint8_t(state.s[3])];
+ result.s[1] = round_key.s[1] ^ //
+ te0[uint8_t(state.s[1] >> 24)] ^ //
+ te1[uint8_t(state.s[2] >> 16)] ^ //
+ te2[uint8_t(state.s[3] >> 8)] ^ //
+ te3[uint8_t(state.s[0])];
+ result.s[2] = round_key.s[2] ^ //
+ te0[uint8_t(state.s[2] >> 24)] ^ //
+ te1[uint8_t(state.s[3] >> 16)] ^ //
+ te2[uint8_t(state.s[0] >> 8)] ^ //
+ te3[uint8_t(state.s[1])];
+ result.s[3] = round_key.s[3] ^ //
+ te0[uint8_t(state.s[3] >> 24)] ^ //
+ te1[uint8_t(state.s[0] >> 16)] ^ //
+ te2[uint8_t(state.s[1] >> 8)] ^ //
+ te3[uint8_t(state.s[2])];
+ return result;
+}
+
+using ::absl::random_internal::RandenTraits;
+
+// Randen operates on 128-bit vectors.
+struct alignas(16) u64x2 {
+ uint64_t data[2];
+};
+
+// The improved Feistel block shuffle function for 16 blocks.
+inline ABSL_RANDOM_INTERNAL_ATTRIBUTE_ALWAYS_INLINE void BlockShuffle(
+ u64x2* state) {
+ static_assert(RandenTraits::kFeistelBlocks == 16,
+ "Feistel block shuffle only works for 16 blocks.");
+
+ constexpr size_t shuffle[RandenTraits::kFeistelBlocks] = {
+ 7, 2, 13, 4, 11, 8, 3, 6, 15, 0, 9, 10, 1, 14, 5, 12};
+
+ // The fully unrolled loop without the memcpy improves the speed by about
+ // 30% over the equivalent:
+#if 0
+ u64x2 source[RandenTraits::kFeistelBlocks];
+ std::memcpy(source, state, sizeof(source));
+ for (size_t i = 0; i < RandenTraits::kFeistelBlocks; i++) {
+ const u64x2 v0 = source[shuffle[i]];
+ state[i] = v0;
+ }
+ return;
+#endif
+
+ const u64x2 v0 = state[shuffle[0]];
+ const u64x2 v1 = state[shuffle[1]];
+ const u64x2 v2 = state[shuffle[2]];
+ const u64x2 v3 = state[shuffle[3]];
+ const u64x2 v4 = state[shuffle[4]];
+ const u64x2 v5 = state[shuffle[5]];
+ const u64x2 v6 = state[shuffle[6]];
+ const u64x2 v7 = state[shuffle[7]];
+ const u64x2 w0 = state[shuffle[8]];
+ const u64x2 w1 = state[shuffle[9]];
+ const u64x2 w2 = state[shuffle[10]];
+ const u64x2 w3 = state[shuffle[11]];
+ const u64x2 w4 = state[shuffle[12]];
+ const u64x2 w5 = state[shuffle[13]];
+ const u64x2 w6 = state[shuffle[14]];
+ const u64x2 w7 = state[shuffle[15]];
+ state[0] = v0;
+ state[1] = v1;
+ state[2] = v2;
+ state[3] = v3;
+ state[4] = v4;
+ state[5] = v5;
+ state[6] = v6;
+ state[7] = v7;
+ state[8] = w0;
+ state[9] = w1;
+ state[10] = w2;
+ state[11] = w3;
+ state[12] = w4;
+ state[13] = w5;
+ state[14] = w6;
+ state[15] = w7;
+}
+
+// Feistel round function using two AES subrounds. Very similar to F()
+// from Simpira v2, but with independent subround keys. Uses 17 AES rounds
+// per 16 bytes (vs. 10 for AES-CTR). Computing eight round functions in
+// parallel hides the 7-cycle AESNI latency on HSW. Note that the Feistel
+// XORs are 'free' (included in the second AES instruction).
+inline ABSL_RANDOM_INTERNAL_ATTRIBUTE_ALWAYS_INLINE const u64x2* FeistelRound(
+ u64x2* ABSL_RANDOM_INTERNAL_RESTRICT state,
+ const u64x2* ABSL_RANDOM_INTERNAL_RESTRICT keys) {
+ for (size_t branch = 0; branch < RandenTraits::kFeistelBlocks; branch += 4) {
+ const Vector128 s0 = Vector128Load(state + branch);
+ const Vector128 s1 = Vector128Load(state + branch + 1);
+ const Vector128 f0 = AesRound(s0, Vector128Load(keys));
+ keys++;
+ const Vector128 o1 = AesRound(f0, s1);
+ Vector128Store(o1, state + branch + 1);
+
+ // Manually unroll this loop once. about 10% better than not unrolled.
+ const Vector128 s2 = Vector128Load(state + branch + 2);
+ const Vector128 s3 = Vector128Load(state + branch + 3);
+ const Vector128 f2 = AesRound(s2, Vector128Load(keys));
+ keys++;
+ const Vector128 o3 = AesRound(f2, s3);
+ Vector128Store(o3, state + branch + 3);
+ }
+ return keys;
+}
+
+// Cryptographic permutation based via type-2 Generalized Feistel Network.
+// Indistinguishable from ideal by chosen-ciphertext adversaries using less than
+// 2^64 queries if the round function is a PRF. This is similar to the b=8 case
+// of Simpira v2, but more efficient than its generic construction for b=16.
+inline ABSL_RANDOM_INTERNAL_ATTRIBUTE_ALWAYS_INLINE void Permute(
+ u64x2* state, const u64x2* ABSL_RANDOM_INTERNAL_RESTRICT keys) {
+ for (size_t round = 0; round < RandenTraits::kFeistelRounds; ++round) {
+ keys = FeistelRound(state, keys);
+ BlockShuffle(state);
+ }
+}
+
+} // namespace
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace random_internal {
+
+const void* RandenSlow::GetKeys() {
+ // Round keys for one AES per Feistel round and branch.
+ // The canonical implementation uses first digits of Pi.
+ return kRandenRoundKeys;
+}
+
+void RandenSlow::Absorb(const void* seed_void, void* state_void) {
+ auto* state =
+ reinterpret_cast<uint64_t * ABSL_RANDOM_INTERNAL_RESTRICT>(state_void);
+ const auto* seed =
+ reinterpret_cast<const uint64_t * ABSL_RANDOM_INTERNAL_RESTRICT>(
+ seed_void);
+
+ constexpr size_t kCapacityBlocks =
+ RandenTraits::kCapacityBytes / sizeof(uint64_t);
+ static_assert(
+ kCapacityBlocks * sizeof(uint64_t) == RandenTraits::kCapacityBytes,
+ "Not i*V");
+
+ for (size_t i = kCapacityBlocks;
+ i < RandenTraits::kStateBytes / sizeof(uint64_t); ++i) {
+ state[i] ^= seed[i - kCapacityBlocks];
+ }
+}
+
+void RandenSlow::Generate(const void* keys_void, void* state_void) {
+ static_assert(RandenTraits::kCapacityBytes == sizeof(u64x2),
+ "Capacity mismatch");
+
+ auto* state = reinterpret_cast<u64x2*>(state_void);
+ const auto* keys = reinterpret_cast<const u64x2*>(keys_void);
+
+ const u64x2 prev_inner = state[0];
+
+ Permute(state, keys);
+
+ // Ensure backtracking resistance.
+ state[0].data[0] ^= prev_inner.data[0];
+ state[0].data[1] ^= prev_inner.data[1];
+}
+
+} // namespace random_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/random/internal/randen_slow.h b/third_party/abseil/src/absl/random/internal/randen_slow.h
new file mode 100644
index 0000000..b6f137e
--- /dev/null
+++ b/third_party/abseil/src/absl/random/internal/randen_slow.h
@@ -0,0 +1,40 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_RANDOM_INTERNAL_RANDEN_SLOW_H_
+#define ABSL_RANDOM_INTERNAL_RANDEN_SLOW_H_
+
+#include <cstddef>
+
+#include "absl/base/config.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace random_internal {
+
+// RANDen = RANDom generator or beetroots in Swiss German.
+// RandenSlow implements the basic state manipulation methods for
+// architectures lacking AES hardware acceleration intrinsics.
+class RandenSlow {
+ public:
+ static void Generate(const void* keys, void* state_void);
+ static void Absorb(const void* seed_void, void* state_void);
+ static const void* GetKeys();
+};
+
+} // namespace random_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_RANDOM_INTERNAL_RANDEN_SLOW_H_
diff --git a/third_party/abseil/src/absl/random/internal/randen_slow_test.cc b/third_party/abseil/src/absl/random/internal/randen_slow_test.cc
new file mode 100644
index 0000000..4a53583
--- /dev/null
+++ b/third_party/abseil/src/absl/random/internal/randen_slow_test.cc
@@ -0,0 +1,63 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/random/internal/randen_slow.h"
+
+#include <cstring>
+
+#include "gtest/gtest.h"
+#include "absl/random/internal/randen_traits.h"
+
+namespace {
+
+using absl::random_internal::RandenSlow;
+using absl::random_internal::RandenTraits;
+
+// Local state parameters.
+constexpr size_t kSeedBytes =
+ RandenTraits::kStateBytes - RandenTraits::kCapacityBytes;
+constexpr size_t kStateSizeT = RandenTraits::kStateBytes / sizeof(uint64_t);
+constexpr size_t kSeedSizeT = kSeedBytes / sizeof(uint32_t);
+
+struct alignas(16) randen {
+ uint64_t state[kStateSizeT];
+ uint32_t seed[kSeedSizeT];
+};
+
+TEST(RandenSlowTest, Default) {
+ constexpr uint64_t kGolden[] = {
+ 0x6c6534090ee6d3ee, 0x044e2b9b9d5333c6, 0xc3c14f134e433977,
+ 0xdda9f47cd90410ee, 0x887bf3087fd8ca10, 0xf0b780f545c72912,
+ 0x15dbb1d37696599f, 0x30ec63baff3c6d59, 0xb29f73606f7f20a6,
+ 0x02808a316f49a54c, 0x3b8feaf9d5c8e50e, 0x9cbf605e3fd9de8a,
+ 0xc970ae1a78183bbb, 0xd8b2ffd356301ed5, 0xf4b327fe0fc73c37,
+ 0xcdfd8d76eb8f9a19, 0xc3a506eb91420c9d, 0xd5af05dd3eff9556,
+ 0x48db1bb78f83c4a1, 0x7023920e0d6bfe8c, 0x58d3575834956d42,
+ 0xed1ef4c26b87b840, 0x8eef32a23e0b2df3, 0x497cabf3431154fc,
+ 0x4e24370570029a8b, 0xd88b5749f090e5ea, 0xc651a582a970692f,
+ 0x78fcec2cbb6342f5, 0x463cb745612f55db, 0x352ee4ad1816afe3,
+ 0x026ff374c101da7e, 0x811ef0821c3de851,
+ };
+
+ alignas(16) randen d;
+ std::memset(d.state, 0, sizeof(d.state));
+ RandenSlow::Generate(RandenSlow::GetKeys(), d.state);
+
+ uint64_t* id = d.state;
+ for (const auto& elem : kGolden) {
+ EXPECT_EQ(elem, *id++);
+ }
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/random/internal/randen_test.cc b/third_party/abseil/src/absl/random/internal/randen_test.cc
new file mode 100644
index 0000000..c186fe0
--- /dev/null
+++ b/third_party/abseil/src/absl/random/internal/randen_test.cc
@@ -0,0 +1,70 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/random/internal/randen.h"
+
+#include <cstring>
+
+#include "gtest/gtest.h"
+#include "absl/meta/type_traits.h"
+
+namespace {
+
+using absl::random_internal::Randen;
+
+// Local state parameters.
+constexpr size_t kStateSizeT = Randen::kStateBytes / sizeof(uint64_t);
+
+TEST(RandenTest, CopyAndMove) {
+ static_assert(std::is_copy_constructible<Randen>::value,
+ "Randen must be copy constructible");
+
+ static_assert(absl::is_copy_assignable<Randen>::value,
+ "Randen must be copy assignable");
+
+ static_assert(std::is_move_constructible<Randen>::value,
+ "Randen must be move constructible");
+
+ static_assert(absl::is_move_assignable<Randen>::value,
+ "Randen must be move assignable");
+}
+
+TEST(RandenTest, Default) {
+ constexpr uint64_t kGolden[] = {
+ 0x6c6534090ee6d3ee, 0x044e2b9b9d5333c6, 0xc3c14f134e433977,
+ 0xdda9f47cd90410ee, 0x887bf3087fd8ca10, 0xf0b780f545c72912,
+ 0x15dbb1d37696599f, 0x30ec63baff3c6d59, 0xb29f73606f7f20a6,
+ 0x02808a316f49a54c, 0x3b8feaf9d5c8e50e, 0x9cbf605e3fd9de8a,
+ 0xc970ae1a78183bbb, 0xd8b2ffd356301ed5, 0xf4b327fe0fc73c37,
+ 0xcdfd8d76eb8f9a19, 0xc3a506eb91420c9d, 0xd5af05dd3eff9556,
+ 0x48db1bb78f83c4a1, 0x7023920e0d6bfe8c, 0x58d3575834956d42,
+ 0xed1ef4c26b87b840, 0x8eef32a23e0b2df3, 0x497cabf3431154fc,
+ 0x4e24370570029a8b, 0xd88b5749f090e5ea, 0xc651a582a970692f,
+ 0x78fcec2cbb6342f5, 0x463cb745612f55db, 0x352ee4ad1816afe3,
+ 0x026ff374c101da7e, 0x811ef0821c3de851,
+ };
+
+ alignas(16) uint64_t state[kStateSizeT];
+ std::memset(state, 0, sizeof(state));
+
+ Randen r;
+ r.Generate(state);
+
+ auto id = std::begin(state);
+ for (const auto& elem : kGolden) {
+ EXPECT_EQ(elem, *id++);
+ }
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/random/internal/randen_traits.h b/third_party/abseil/src/absl/random/internal/randen_traits.h
new file mode 100644
index 0000000..53caa93
--- /dev/null
+++ b/third_party/abseil/src/absl/random/internal/randen_traits.h
@@ -0,0 +1,88 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_RANDOM_INTERNAL_RANDEN_TRAITS_H_
+#define ABSL_RANDOM_INTERNAL_RANDEN_TRAITS_H_
+
+// HERMETIC NOTE: The randen_hwaes target must not introduce duplicate
+// symbols from arbitrary system and other headers, since it may be built
+// with different flags from other targets, using different levels of
+// optimization, potentially introducing ODR violations.
+
+#include <cstddef>
+
+#include "absl/base/config.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace random_internal {
+
+// RANDen = RANDom generator or beetroots in Swiss German.
+// 'Strong' (well-distributed, unpredictable, backtracking-resistant) random
+// generator, faster in some benchmarks than std::mt19937_64 and pcg64_c32.
+//
+// High-level summary:
+// 1) Reverie (see "A Robust and Sponge-Like PRNG with Improved Efficiency") is
+// a sponge-like random generator that requires a cryptographic permutation.
+// It improves upon "Provably Robust Sponge-Based PRNGs and KDFs" by
+// achieving backtracking resistance with only one Permute() per buffer.
+//
+// 2) "Simpira v2: A Family of Efficient Permutations Using the AES Round
+// Function" constructs up to 1024-bit permutations using an improved
+// Generalized Feistel network with 2-round AES-128 functions. This Feistel
+// block shuffle achieves diffusion faster and is less vulnerable to
+// sliced-biclique attacks than the Type-2 cyclic shuffle.
+//
+// 3) "Improving the Generalized Feistel" and "New criterion for diffusion
+// property" extends the same kind of improved Feistel block shuffle to 16
+// branches, which enables a 2048-bit permutation.
+//
+// Combine these three ideas and also change Simpira's subround keys from
+// structured/low-entropy counters to digits of Pi (or other random source).
+
+// RandenTraits contains the basic algorithm traits, such as the size of the
+// state, seed, sponge, etc.
+struct RandenTraits {
+ // Size of the entire sponge / state for the randen PRNG.
+ static constexpr size_t kStateBytes = 256; // 2048-bit
+
+ // Size of the 'inner' (inaccessible) part of the sponge. Larger values would
+ // require more frequent calls to RandenGenerate.
+ static constexpr size_t kCapacityBytes = 16; // 128-bit
+
+ // Size of the default seed consumed by the sponge.
+ static constexpr size_t kSeedBytes = kStateBytes - kCapacityBytes;
+
+ // Assuming 128-bit blocks, the number of blocks in the state.
+ // Largest size for which security proofs are known.
+ static constexpr size_t kFeistelBlocks = 16;
+
+ // Ensures SPRP security and two full subblock diffusions.
+ // Must be > 4 * log2(kFeistelBlocks).
+ static constexpr size_t kFeistelRounds = 16 + 1;
+
+ // Size of the key. A 128-bit key block is used for every-other
+ // feistel block (Type-2 generalized Feistel network) in each round.
+ static constexpr size_t kKeyBytes = 16 * kFeistelRounds * kFeistelBlocks / 2;
+};
+
+// Randen key arrays. In randen_round_keys.cc
+extern const unsigned char kRandenRoundKeys[RandenTraits::kKeyBytes];
+extern const unsigned char kRandenRoundKeysBE[RandenTraits::kKeyBytes];
+
+} // namespace random_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_RANDOM_INTERNAL_RANDEN_TRAITS_H_
diff --git a/third_party/abseil/src/absl/random/internal/salted_seed_seq.h b/third_party/abseil/src/absl/random/internal/salted_seed_seq.h
new file mode 100644
index 0000000..5953a09
--- /dev/null
+++ b/third_party/abseil/src/absl/random/internal/salted_seed_seq.h
@@ -0,0 +1,167 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_RANDOM_INTERNAL_SALTED_SEED_SEQ_H_
+#define ABSL_RANDOM_INTERNAL_SALTED_SEED_SEQ_H_
+
+#include <cstdint>
+#include <cstdlib>
+#include <initializer_list>
+#include <iterator>
+#include <memory>
+#include <type_traits>
+#include <utility>
+
+#include "absl/container/inlined_vector.h"
+#include "absl/meta/type_traits.h"
+#include "absl/random/internal/seed_material.h"
+#include "absl/types/optional.h"
+#include "absl/types/span.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace random_internal {
+
+// This class conforms to the C++ Standard "Seed Sequence" concept
+// [rand.req.seedseq].
+//
+// A `SaltedSeedSeq` is meant to wrap an existing seed sequence and modify
+// generated sequence by mixing with extra entropy. This entropy may be
+// build-dependent or process-dependent. The implementation may change to be
+// have either or both kinds of entropy. If salt is not available sequence is
+// not modified.
+template <typename SSeq>
+class SaltedSeedSeq {
+ public:
+ using inner_sequence_type = SSeq;
+ using result_type = typename SSeq::result_type;
+
+ SaltedSeedSeq() : seq_(absl::make_unique<SSeq>()) {}
+
+ template <typename Iterator>
+ SaltedSeedSeq(Iterator begin, Iterator end)
+ : seq_(absl::make_unique<SSeq>(begin, end)) {}
+
+ template <typename T>
+ SaltedSeedSeq(std::initializer_list<T> il)
+ : SaltedSeedSeq(il.begin(), il.end()) {}
+
+ SaltedSeedSeq(const SaltedSeedSeq&) = delete;
+ SaltedSeedSeq& operator=(const SaltedSeedSeq&) = delete;
+
+ SaltedSeedSeq(SaltedSeedSeq&&) = default;
+ SaltedSeedSeq& operator=(SaltedSeedSeq&&) = default;
+
+ template <typename RandomAccessIterator>
+ void generate(RandomAccessIterator begin, RandomAccessIterator end) {
+ // The common case is that generate is called with ContiguousIterators
+ // to uint arrays. Such contiguous memory regions may be optimized,
+ // which we detect here.
+ using tag = absl::conditional_t<
+ (std::is_pointer<RandomAccessIterator>::value &&
+ std::is_same<absl::decay_t<decltype(*begin)>, uint32_t>::value),
+ ContiguousAndUint32Tag, DefaultTag>;
+ if (begin != end) {
+ generate_impl(begin, end, tag{});
+ }
+ }
+
+ template <typename OutIterator>
+ void param(OutIterator out) const {
+ seq_->param(out);
+ }
+
+ size_t size() const { return seq_->size(); }
+
+ private:
+ struct ContiguousAndUint32Tag {};
+ struct DefaultTag {};
+
+ // Generate which requires the iterators are contiguous pointers to uint32_t.
+ void generate_impl(uint32_t* begin, uint32_t* end, ContiguousAndUint32Tag) {
+ generate_contiguous(absl::MakeSpan(begin, end));
+ }
+
+ // The uncommon case for generate is that it is called with iterators over
+ // some other buffer type which is assignable from a 32-bit value. In this
+ // case we allocate a temporary 32-bit buffer and then copy-assign back
+ // to the initial inputs.
+ template <typename RandomAccessIterator>
+ void generate_impl(RandomAccessIterator begin, RandomAccessIterator end,
+ DefaultTag) {
+ return generate_and_copy(std::distance(begin, end), begin);
+ }
+
+ // Fills the initial seed buffer the underlying SSeq::generate() call,
+ // mixing in the salt material.
+ void generate_contiguous(absl::Span<uint32_t> buffer) {
+ seq_->generate(buffer.begin(), buffer.end());
+ const uint32_t salt = absl::random_internal::GetSaltMaterial().value_or(0);
+ MixIntoSeedMaterial(absl::MakeConstSpan(&salt, 1), buffer);
+ }
+
+ // Allocates a seed buffer of `n` elements, generates the seed, then
+ // copies the result into the `out` iterator.
+ template <typename Iterator>
+ void generate_and_copy(size_t n, Iterator out) {
+ // Allocate a temporary buffer, generate, and then copy.
+ absl::InlinedVector<uint32_t, 8> data(n, 0);
+ generate_contiguous(absl::MakeSpan(data.data(), data.size()));
+ std::copy(data.begin(), data.end(), out);
+ }
+
+ // Because [rand.req.seedseq] is not required to be copy-constructible,
+ // copy-assignable nor movable, we wrap it with unique pointer to be able
+ // to move SaltedSeedSeq.
+ std::unique_ptr<SSeq> seq_;
+};
+
+// is_salted_seed_seq indicates whether the type is a SaltedSeedSeq.
+template <typename T, typename = void>
+struct is_salted_seed_seq : public std::false_type {};
+
+template <typename T>
+struct is_salted_seed_seq<
+ T, typename std::enable_if<std::is_same<
+ T, SaltedSeedSeq<typename T::inner_sequence_type>>::value>::type>
+ : public std::true_type {};
+
+// MakeSaltedSeedSeq returns a salted variant of the seed sequence.
+// When provided with an existing SaltedSeedSeq, returns the input parameter,
+// otherwise constructs a new SaltedSeedSeq which embodies the original
+// non-salted seed parameters.
+template <
+ typename SSeq, //
+ typename EnableIf = absl::enable_if_t<is_salted_seed_seq<SSeq>::value>>
+SSeq MakeSaltedSeedSeq(SSeq&& seq) {
+ return SSeq(std::forward<SSeq>(seq));
+}
+
+template <
+ typename SSeq, //
+ typename EnableIf = absl::enable_if_t<!is_salted_seed_seq<SSeq>::value>>
+SaltedSeedSeq<typename std::decay<SSeq>::type> MakeSaltedSeedSeq(SSeq&& seq) {
+ using sseq_type = typename std::decay<SSeq>::type;
+ using result_type = typename sseq_type::result_type;
+
+ absl::InlinedVector<result_type, 8> data;
+ seq.param(std::back_inserter(data));
+ return SaltedSeedSeq<sseq_type>(data.begin(), data.end());
+}
+
+} // namespace random_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_RANDOM_INTERNAL_SALTED_SEED_SEQ_H_
diff --git a/third_party/abseil/src/absl/random/internal/salted_seed_seq_test.cc b/third_party/abseil/src/absl/random/internal/salted_seed_seq_test.cc
new file mode 100644
index 0000000..0bf19a6
--- /dev/null
+++ b/third_party/abseil/src/absl/random/internal/salted_seed_seq_test.cc
@@ -0,0 +1,168 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/random/internal/salted_seed_seq.h"
+
+#include <iterator>
+#include <random>
+#include <utility>
+#include <vector>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+
+using absl::random_internal::GetSaltMaterial;
+using absl::random_internal::MakeSaltedSeedSeq;
+using absl::random_internal::SaltedSeedSeq;
+using testing::Eq;
+using testing::Pointwise;
+
+namespace {
+
+template <typename Sseq>
+void ConformsToInterface() {
+ // Check that the SeedSequence can be default-constructed.
+ { Sseq default_constructed_seq; }
+ // Check that the SeedSequence can be constructed with two iterators.
+ {
+ uint32_t init_array[] = {1, 3, 5, 7, 9};
+ Sseq iterator_constructed_seq(std::begin(init_array), std::end(init_array));
+ }
+ // Check that the SeedSequence can be std::initializer_list-constructed.
+ { Sseq list_constructed_seq = {1, 3, 5, 7, 9, 11, 13}; }
+ // Check that param() and size() return state provided to constructor.
+ {
+ uint32_t init_array[] = {1, 2, 3, 4, 5};
+ Sseq seq(std::begin(init_array), std::end(init_array));
+ EXPECT_EQ(seq.size(), ABSL_ARRAYSIZE(init_array));
+
+ std::vector<uint32_t> state_vector;
+ seq.param(std::back_inserter(state_vector));
+
+ EXPECT_EQ(state_vector.size(), ABSL_ARRAYSIZE(init_array));
+ for (int i = 0; i < state_vector.size(); i++) {
+ EXPECT_EQ(state_vector[i], i + 1);
+ }
+ }
+ // Check for presence of generate() method.
+ {
+ Sseq seq;
+ uint32_t seeds[5];
+
+ seq.generate(std::begin(seeds), std::end(seeds));
+ }
+}
+
+TEST(SaltedSeedSeq, CheckInterfaces) {
+ // Control case
+ ConformsToInterface<std::seed_seq>();
+
+ // Abseil classes
+ ConformsToInterface<SaltedSeedSeq<std::seed_seq>>();
+}
+
+TEST(SaltedSeedSeq, CheckConstructingFromOtherSequence) {
+ std::vector<uint32_t> seed_values(10, 1);
+ std::seed_seq seq(seed_values.begin(), seed_values.end());
+ auto salted_seq = MakeSaltedSeedSeq(std::move(seq));
+
+ EXPECT_EQ(seq.size(), salted_seq.size());
+
+ std::vector<uint32_t> param_result;
+ seq.param(std::back_inserter(param_result));
+
+ EXPECT_EQ(seed_values, param_result);
+}
+
+TEST(SaltedSeedSeq, SaltedSaltedSeedSeqIsNotDoubleSalted) {
+ uint32_t init[] = {1, 3, 5, 7, 9};
+
+ std::seed_seq seq(std::begin(init), std::end(init));
+
+ // The first salting.
+ SaltedSeedSeq<std::seed_seq> salted_seq = MakeSaltedSeedSeq(std::move(seq));
+ uint32_t a[16];
+ salted_seq.generate(std::begin(a), std::end(a));
+
+ // The second salting.
+ SaltedSeedSeq<std::seed_seq> salted_salted_seq =
+ MakeSaltedSeedSeq(std::move(salted_seq));
+ uint32_t b[16];
+ salted_salted_seq.generate(std::begin(b), std::end(b));
+
+ // ... both should be equal.
+ EXPECT_THAT(b, Pointwise(Eq(), a)) << "a[0] " << a[0];
+}
+
+TEST(SaltedSeedSeq, SeedMaterialIsSalted) {
+ const size_t kNumBlocks = 16;
+
+ uint32_t seed_material[kNumBlocks];
+ std::random_device urandom{"/dev/urandom"};
+ for (uint32_t& seed : seed_material) {
+ seed = urandom();
+ }
+
+ std::seed_seq seq(std::begin(seed_material), std::end(seed_material));
+ SaltedSeedSeq<std::seed_seq> salted_seq(std::begin(seed_material),
+ std::end(seed_material));
+
+ bool salt_is_available = GetSaltMaterial().has_value();
+
+ // If salt is available generated sequence should be different.
+ if (salt_is_available) {
+ uint32_t outputs[kNumBlocks];
+ uint32_t salted_outputs[kNumBlocks];
+
+ seq.generate(std::begin(outputs), std::end(outputs));
+ salted_seq.generate(std::begin(salted_outputs), std::end(salted_outputs));
+
+ EXPECT_THAT(outputs, Pointwise(testing::Ne(), salted_outputs));
+ }
+}
+
+TEST(SaltedSeedSeq, GenerateAcceptsDifferentTypes) {
+ const size_t kNumBlocks = 4;
+
+ SaltedSeedSeq<std::seed_seq> seq({1, 2, 3});
+
+ uint32_t expected[kNumBlocks];
+ seq.generate(std::begin(expected), std::end(expected));
+
+ // 32-bit outputs
+ {
+ unsigned long seed_material[kNumBlocks]; // NOLINT(runtime/int)
+ seq.generate(std::begin(seed_material), std::end(seed_material));
+ EXPECT_THAT(seed_material, Pointwise(Eq(), expected));
+ }
+ {
+ unsigned int seed_material[kNumBlocks]; // NOLINT(runtime/int)
+ seq.generate(std::begin(seed_material), std::end(seed_material));
+ EXPECT_THAT(seed_material, Pointwise(Eq(), expected));
+ }
+
+ // 64-bit outputs.
+ {
+ uint64_t seed_material[kNumBlocks];
+ seq.generate(std::begin(seed_material), std::end(seed_material));
+ EXPECT_THAT(seed_material, Pointwise(Eq(), expected));
+ }
+ {
+ int64_t seed_material[kNumBlocks];
+ seq.generate(std::begin(seed_material), std::end(seed_material));
+ EXPECT_THAT(seed_material, Pointwise(Eq(), expected));
+ }
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/random/internal/seed_material.cc b/third_party/abseil/src/absl/random/internal/seed_material.cc
new file mode 100644
index 0000000..4d38a57
--- /dev/null
+++ b/third_party/abseil/src/absl/random/internal/seed_material.cc
@@ -0,0 +1,219 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/random/internal/seed_material.h"
+
+#include <fcntl.h>
+
+#ifndef _WIN32
+#include <unistd.h>
+#else
+#include <io.h>
+#endif
+
+#include <algorithm>
+#include <cerrno>
+#include <cstdint>
+#include <cstdlib>
+#include <cstring>
+
+#include "absl/base/internal/raw_logging.h"
+#include "absl/strings/ascii.h"
+#include "absl/strings/escaping.h"
+#include "absl/strings/string_view.h"
+#include "absl/strings/strip.h"
+
+#if defined(__native_client__)
+
+#include <nacl/nacl_random.h>
+#define ABSL_RANDOM_USE_NACL_SECURE_RANDOM 1
+
+#elif defined(_WIN32)
+
+#include <windows.h>
+#define ABSL_RANDOM_USE_BCRYPT 1
+#pragma comment(lib, "bcrypt.lib")
+
+#elif defined(__Fuchsia__)
+#include <zircon/syscalls.h>
+
+#endif
+
+#if defined(ABSL_RANDOM_USE_BCRYPT)
+#include <bcrypt.h>
+
+#ifndef BCRYPT_SUCCESS
+#define BCRYPT_SUCCESS(Status) (((NTSTATUS)(Status)) >= 0)
+#endif
+// Also link bcrypt; this can be done via linker options or:
+// #pragma comment(lib, "bcrypt.lib")
+#endif
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace random_internal {
+namespace {
+
+// Read OS Entropy for random number seeds.
+// TODO(absl-team): Possibly place a cap on how much entropy may be read at a
+// time.
+
+#if defined(ABSL_RANDOM_USE_BCRYPT)
+
+// On Windows potentially use the BCRYPT CNG API to read available entropy.
+bool ReadSeedMaterialFromOSEntropyImpl(absl::Span<uint32_t> values) {
+ BCRYPT_ALG_HANDLE hProvider;
+ NTSTATUS ret;
+ ret = BCryptOpenAlgorithmProvider(&hProvider, BCRYPT_RNG_ALGORITHM,
+ MS_PRIMITIVE_PROVIDER, 0);
+ if (!(BCRYPT_SUCCESS(ret))) {
+ ABSL_RAW_LOG(ERROR, "Failed to open crypto provider.");
+ return false;
+ }
+ ret = BCryptGenRandom(
+ hProvider, // provider
+ reinterpret_cast<UCHAR*>(values.data()), // buffer
+ static_cast<ULONG>(sizeof(uint32_t) * values.size()), // bytes
+ 0); // flags
+ BCryptCloseAlgorithmProvider(hProvider, 0);
+ return BCRYPT_SUCCESS(ret);
+}
+
+#elif defined(ABSL_RANDOM_USE_NACL_SECURE_RANDOM)
+
+// On NaCL use nacl_secure_random to acquire bytes.
+bool ReadSeedMaterialFromOSEntropyImpl(absl::Span<uint32_t> values) {
+ auto buffer = reinterpret_cast<uint8_t*>(values.data());
+ size_t buffer_size = sizeof(uint32_t) * values.size();
+
+ uint8_t* output_ptr = buffer;
+ while (buffer_size > 0) {
+ size_t nread = 0;
+ const int error = nacl_secure_random(output_ptr, buffer_size, &nread);
+ if (error != 0 || nread > buffer_size) {
+ ABSL_RAW_LOG(ERROR, "Failed to read secure_random seed data: %d", error);
+ return false;
+ }
+ output_ptr += nread;
+ buffer_size -= nread;
+ }
+ return true;
+}
+
+#elif defined(__Fuchsia__)
+
+bool ReadSeedMaterialFromOSEntropyImpl(absl::Span<uint32_t> values) {
+ auto buffer = reinterpret_cast<uint8_t*>(values.data());
+ size_t buffer_size = sizeof(uint32_t) * values.size();
+ zx_cprng_draw(buffer, buffer_size);
+ return true;
+}
+
+#else
+
+// On *nix, read entropy from /dev/urandom.
+bool ReadSeedMaterialFromOSEntropyImpl(absl::Span<uint32_t> values) {
+ const char kEntropyFile[] = "/dev/urandom";
+
+ auto buffer = reinterpret_cast<uint8_t*>(values.data());
+ size_t buffer_size = sizeof(uint32_t) * values.size();
+
+ int dev_urandom = open(kEntropyFile, O_RDONLY);
+ bool success = (-1 != dev_urandom);
+ if (!success) {
+ return false;
+ }
+
+ while (success && buffer_size > 0) {
+ int bytes_read = read(dev_urandom, buffer, buffer_size);
+ int read_error = errno;
+ success = (bytes_read > 0);
+ if (success) {
+ buffer += bytes_read;
+ buffer_size -= bytes_read;
+ } else if (bytes_read == -1 && read_error == EINTR) {
+ success = true; // Need to try again.
+ }
+ }
+ close(dev_urandom);
+ return success;
+}
+
+#endif
+
+} // namespace
+
+bool ReadSeedMaterialFromOSEntropy(absl::Span<uint32_t> values) {
+ assert(values.data() != nullptr);
+ if (values.data() == nullptr) {
+ return false;
+ }
+ if (values.empty()) {
+ return true;
+ }
+ return ReadSeedMaterialFromOSEntropyImpl(values);
+}
+
+void MixIntoSeedMaterial(absl::Span<const uint32_t> sequence,
+ absl::Span<uint32_t> seed_material) {
+ // Algorithm is based on code available at
+ // https://gist.github.com/imneme/540829265469e673d045
+ constexpr uint32_t kInitVal = 0x43b0d7e5;
+ constexpr uint32_t kHashMul = 0x931e8875;
+ constexpr uint32_t kMixMulL = 0xca01f9dd;
+ constexpr uint32_t kMixMulR = 0x4973f715;
+ constexpr uint32_t kShiftSize = sizeof(uint32_t) * 8 / 2;
+
+ uint32_t hash_const = kInitVal;
+ auto hash = [&](uint32_t value) {
+ value ^= hash_const;
+ hash_const *= kHashMul;
+ value *= hash_const;
+ value ^= value >> kShiftSize;
+ return value;
+ };
+
+ auto mix = [&](uint32_t x, uint32_t y) {
+ uint32_t result = kMixMulL * x - kMixMulR * y;
+ result ^= result >> kShiftSize;
+ return result;
+ };
+
+ for (const auto& seq_val : sequence) {
+ for (auto& elem : seed_material) {
+ elem = mix(elem, hash(seq_val));
+ }
+ }
+}
+
+absl::optional<uint32_t> GetSaltMaterial() {
+ // Salt must be common for all generators within the same process so read it
+ // only once and store in static variable.
+ static const auto salt_material = []() -> absl::optional<uint32_t> {
+ uint32_t salt_value = 0;
+
+ if (random_internal::ReadSeedMaterialFromOSEntropy(
+ MakeSpan(&salt_value, 1))) {
+ return salt_value;
+ }
+
+ return absl::nullopt;
+ }();
+
+ return salt_material;
+}
+
+} // namespace random_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/random/internal/seed_material.h b/third_party/abseil/src/absl/random/internal/seed_material.h
new file mode 100644
index 0000000..4be10e9
--- /dev/null
+++ b/third_party/abseil/src/absl/random/internal/seed_material.h
@@ -0,0 +1,104 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_RANDOM_INTERNAL_SEED_MATERIAL_H_
+#define ABSL_RANDOM_INTERNAL_SEED_MATERIAL_H_
+
+#include <cassert>
+#include <cstdint>
+#include <cstdlib>
+#include <string>
+#include <vector>
+
+#include "absl/base/attributes.h"
+#include "absl/random/internal/fast_uniform_bits.h"
+#include "absl/types/optional.h"
+#include "absl/types/span.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace random_internal {
+
+// Returns the number of 32-bit blocks needed to contain the given number of
+// bits.
+constexpr size_t SeedBitsToBlocks(size_t seed_size) {
+ return (seed_size + 31) / 32;
+}
+
+// Amount of entropy (measured in bits) used to instantiate a Seed Sequence,
+// with which to create a URBG.
+constexpr size_t kEntropyBitsNeeded = 256;
+
+// Amount of entropy (measured in 32-bit blocks) used to instantiate a Seed
+// Sequence, with which to create a URBG.
+constexpr size_t kEntropyBlocksNeeded =
+ random_internal::SeedBitsToBlocks(kEntropyBitsNeeded);
+
+static_assert(kEntropyBlocksNeeded > 0,
+ "Entropy used to seed URBGs must be nonzero.");
+
+// Attempts to fill a span of uint32_t-values using an OS-provided source of
+// true entropy (eg. /dev/urandom) into an array of uint32_t blocks of data. The
+// resulting array may be used to initialize an instance of a class conforming
+// to the C++ Standard "Seed Sequence" concept [rand.req.seedseq].
+//
+// If values.data() == nullptr, the behavior is undefined.
+ABSL_MUST_USE_RESULT
+bool ReadSeedMaterialFromOSEntropy(absl::Span<uint32_t> values);
+
+// Attempts to fill a span of uint32_t-values using variates generated by an
+// existing instance of a class conforming to the C++ Standard "Uniform Random
+// Bit Generator" concept [rand.req.urng]. The resulting data may be used to
+// initialize an instance of a class conforming to the C++ Standard
+// "Seed Sequence" concept [rand.req.seedseq].
+//
+// If urbg == nullptr or values.data() == nullptr, the behavior is undefined.
+template <typename URBG>
+ABSL_MUST_USE_RESULT bool ReadSeedMaterialFromURBG(
+ URBG* urbg, absl::Span<uint32_t> values) {
+ random_internal::FastUniformBits<uint32_t> distr;
+
+ assert(urbg != nullptr && values.data() != nullptr);
+ if (urbg == nullptr || values.data() == nullptr) {
+ return false;
+ }
+
+ for (uint32_t& seed_value : values) {
+ seed_value = distr(*urbg);
+ }
+ return true;
+}
+
+// Mixes given sequence of values with into given sequence of seed material.
+// Time complexity of this function is O(sequence.size() *
+// seed_material.size()).
+//
+// Algorithm is based on code available at
+// https://gist.github.com/imneme/540829265469e673d045
+// by Melissa O'Neill.
+void MixIntoSeedMaterial(absl::Span<const uint32_t> sequence,
+ absl::Span<uint32_t> seed_material);
+
+// Returns salt value.
+//
+// Salt is obtained only once and stored in static variable.
+//
+// May return empty value if optaining the salt was not possible.
+absl::optional<uint32_t> GetSaltMaterial();
+
+} // namespace random_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_RANDOM_INTERNAL_SEED_MATERIAL_H_
diff --git a/third_party/abseil/src/absl/random/internal/seed_material_test.cc b/third_party/abseil/src/absl/random/internal/seed_material_test.cc
new file mode 100644
index 0000000..6db2820
--- /dev/null
+++ b/third_party/abseil/src/absl/random/internal/seed_material_test.cc
@@ -0,0 +1,202 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/random/internal/seed_material.h"
+
+#include <bitset>
+#include <cstdlib>
+#include <cstring>
+#include <random>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+
+#ifdef __ANDROID__
+// Android assert messages only go to system log, so death tests cannot inspect
+// the message for matching.
+#define ABSL_EXPECT_DEATH_IF_SUPPORTED(statement, regex) \
+ EXPECT_DEATH_IF_SUPPORTED(statement, ".*")
+#else
+#define ABSL_EXPECT_DEATH_IF_SUPPORTED(statement, regex) \
+ EXPECT_DEATH_IF_SUPPORTED(statement, regex)
+#endif
+
+namespace {
+
+using testing::Each;
+using testing::ElementsAre;
+using testing::Eq;
+using testing::Ne;
+using testing::Pointwise;
+
+TEST(SeedBitsToBlocks, VerifyCases) {
+ EXPECT_EQ(0, absl::random_internal::SeedBitsToBlocks(0));
+ EXPECT_EQ(1, absl::random_internal::SeedBitsToBlocks(1));
+ EXPECT_EQ(1, absl::random_internal::SeedBitsToBlocks(31));
+ EXPECT_EQ(1, absl::random_internal::SeedBitsToBlocks(32));
+ EXPECT_EQ(2, absl::random_internal::SeedBitsToBlocks(33));
+ EXPECT_EQ(4, absl::random_internal::SeedBitsToBlocks(127));
+ EXPECT_EQ(4, absl::random_internal::SeedBitsToBlocks(128));
+ EXPECT_EQ(5, absl::random_internal::SeedBitsToBlocks(129));
+}
+
+TEST(ReadSeedMaterialFromOSEntropy, SuccessiveReadsAreDistinct) {
+ constexpr size_t kSeedMaterialSize = 64;
+ uint32_t seed_material_1[kSeedMaterialSize] = {};
+ uint32_t seed_material_2[kSeedMaterialSize] = {};
+
+ EXPECT_TRUE(absl::random_internal::ReadSeedMaterialFromOSEntropy(
+ absl::Span<uint32_t>(seed_material_1, kSeedMaterialSize)));
+ EXPECT_TRUE(absl::random_internal::ReadSeedMaterialFromOSEntropy(
+ absl::Span<uint32_t>(seed_material_2, kSeedMaterialSize)));
+
+ EXPECT_THAT(seed_material_1, Pointwise(Ne(), seed_material_2));
+}
+
+TEST(ReadSeedMaterialFromOSEntropy, ReadZeroBytesIsNoOp) {
+ uint32_t seed_material[32] = {};
+ std::memset(seed_material, 0xAA, sizeof(seed_material));
+ EXPECT_TRUE(absl::random_internal::ReadSeedMaterialFromOSEntropy(
+ absl::Span<uint32_t>(seed_material, 0)));
+
+ EXPECT_THAT(seed_material, Each(Eq(0xAAAAAAAA)));
+}
+
+TEST(ReadSeedMaterialFromOSEntropy, NullPtrVectorArgument) {
+#ifdef NDEBUG
+ EXPECT_FALSE(absl::random_internal::ReadSeedMaterialFromOSEntropy(
+ absl::Span<uint32_t>(nullptr, 32)));
+#else
+ bool result;
+ ABSL_EXPECT_DEATH_IF_SUPPORTED(
+ result = absl::random_internal::ReadSeedMaterialFromOSEntropy(
+ absl::Span<uint32_t>(nullptr, 32)),
+ "!= nullptr");
+ (void)result; // suppress unused-variable warning
+#endif
+}
+
+TEST(ReadSeedMaterialFromURBG, SeedMaterialEqualsVariateSequence) {
+ // Two default-constructed instances of std::mt19937_64 are guaranteed to
+ // produce equal variate-sequences.
+ std::mt19937 urbg_1;
+ std::mt19937 urbg_2;
+ constexpr size_t kSeedMaterialSize = 1024;
+ uint32_t seed_material[kSeedMaterialSize] = {};
+
+ EXPECT_TRUE(absl::random_internal::ReadSeedMaterialFromURBG(
+ &urbg_1, absl::Span<uint32_t>(seed_material, kSeedMaterialSize)));
+ for (uint32_t seed : seed_material) {
+ EXPECT_EQ(seed, urbg_2());
+ }
+}
+
+TEST(ReadSeedMaterialFromURBG, ReadZeroBytesIsNoOp) {
+ std::mt19937_64 urbg;
+ uint32_t seed_material[32];
+ std::memset(seed_material, 0xAA, sizeof(seed_material));
+ EXPECT_TRUE(absl::random_internal::ReadSeedMaterialFromURBG(
+ &urbg, absl::Span<uint32_t>(seed_material, 0)));
+
+ EXPECT_THAT(seed_material, Each(Eq(0xAAAAAAAA)));
+}
+
+TEST(ReadSeedMaterialFromURBG, NullUrbgArgument) {
+ constexpr size_t kSeedMaterialSize = 32;
+ uint32_t seed_material[kSeedMaterialSize];
+#ifdef NDEBUG
+ EXPECT_FALSE(absl::random_internal::ReadSeedMaterialFromURBG<std::mt19937_64>(
+ nullptr, absl::Span<uint32_t>(seed_material, kSeedMaterialSize)));
+#else
+ bool result;
+ ABSL_EXPECT_DEATH_IF_SUPPORTED(
+ result = absl::random_internal::ReadSeedMaterialFromURBG<std::mt19937_64>(
+ nullptr, absl::Span<uint32_t>(seed_material, kSeedMaterialSize)),
+ "!= nullptr");
+ (void)result; // suppress unused-variable warning
+#endif
+}
+
+TEST(ReadSeedMaterialFromURBG, NullPtrVectorArgument) {
+ std::mt19937_64 urbg;
+#ifdef NDEBUG
+ EXPECT_FALSE(absl::random_internal::ReadSeedMaterialFromURBG(
+ &urbg, absl::Span<uint32_t>(nullptr, 32)));
+#else
+ bool result;
+ ABSL_EXPECT_DEATH_IF_SUPPORTED(
+ result = absl::random_internal::ReadSeedMaterialFromURBG(
+ &urbg, absl::Span<uint32_t>(nullptr, 32)),
+ "!= nullptr");
+ (void)result; // suppress unused-variable warning
+#endif
+}
+
+// The avalanche effect is a desirable cryptographic property of hashes in which
+// changing a single bit in the input causes each bit of the output to be
+// changed with probability near 50%.
+//
+// https://en.wikipedia.org/wiki/Avalanche_effect
+
+TEST(MixSequenceIntoSeedMaterial, AvalancheEffectTestOneBitLong) {
+ std::vector<uint32_t> seed_material = {1, 2, 3, 4, 5, 6, 7, 8};
+
+ // For every 32-bit number with exactly one bit set, verify the avalanche
+ // effect holds. In order to reduce flakiness of tests, accept values
+ // anywhere in the range of 30%-70%.
+ for (uint32_t v = 1; v != 0; v <<= 1) {
+ std::vector<uint32_t> seed_material_copy = seed_material;
+ absl::random_internal::MixIntoSeedMaterial(
+ absl::Span<uint32_t>(&v, 1),
+ absl::Span<uint32_t>(seed_material_copy.data(),
+ seed_material_copy.size()));
+
+ uint32_t changed_bits = 0;
+ for (size_t i = 0; i < seed_material.size(); i++) {
+ std::bitset<sizeof(uint32_t) * 8> bitset(seed_material[i] ^
+ seed_material_copy[i]);
+ changed_bits += bitset.count();
+ }
+
+ EXPECT_LE(changed_bits, 0.7 * sizeof(uint32_t) * 8 * seed_material.size());
+ EXPECT_GE(changed_bits, 0.3 * sizeof(uint32_t) * 8 * seed_material.size());
+ }
+}
+
+TEST(MixSequenceIntoSeedMaterial, AvalancheEffectTestOneBitShort) {
+ std::vector<uint32_t> seed_material = {1};
+
+ // For every 32-bit number with exactly one bit set, verify the avalanche
+ // effect holds. In order to reduce flakiness of tests, accept values
+ // anywhere in the range of 30%-70%.
+ for (uint32_t v = 1; v != 0; v <<= 1) {
+ std::vector<uint32_t> seed_material_copy = seed_material;
+ absl::random_internal::MixIntoSeedMaterial(
+ absl::Span<uint32_t>(&v, 1),
+ absl::Span<uint32_t>(seed_material_copy.data(),
+ seed_material_copy.size()));
+
+ uint32_t changed_bits = 0;
+ for (size_t i = 0; i < seed_material.size(); i++) {
+ std::bitset<sizeof(uint32_t) * 8> bitset(seed_material[i] ^
+ seed_material_copy[i]);
+ changed_bits += bitset.count();
+ }
+
+ EXPECT_LE(changed_bits, 0.7 * sizeof(uint32_t) * 8 * seed_material.size());
+ EXPECT_GE(changed_bits, 0.3 * sizeof(uint32_t) * 8 * seed_material.size());
+ }
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/random/internal/sequence_urbg.h b/third_party/abseil/src/absl/random/internal/sequence_urbg.h
new file mode 100644
index 0000000..bc96a12
--- /dev/null
+++ b/third_party/abseil/src/absl/random/internal/sequence_urbg.h
@@ -0,0 +1,60 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_RANDOM_INTERNAL_SEQUENCE_URBG_H_
+#define ABSL_RANDOM_INTERNAL_SEQUENCE_URBG_H_
+
+#include <cstdint>
+#include <cstring>
+#include <limits>
+#include <type_traits>
+#include <vector>
+
+#include "absl/base/config.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace random_internal {
+
+// `sequence_urbg` is a simple random number generator which meets the
+// requirements of [rand.req.urbg], and is solely for testing absl
+// distributions.
+class sequence_urbg {
+ public:
+ using result_type = uint64_t;
+
+ static constexpr result_type(min)() {
+ return (std::numeric_limits<result_type>::min)();
+ }
+ static constexpr result_type(max)() {
+ return (std::numeric_limits<result_type>::max)();
+ }
+
+ sequence_urbg(std::initializer_list<result_type> data) : i_(0), data_(data) {}
+ void reset() { i_ = 0; }
+
+ result_type operator()() { return data_[i_++ % data_.size()]; }
+
+ size_t invocations() const { return i_; }
+
+ private:
+ size_t i_;
+ std::vector<result_type> data_;
+};
+
+} // namespace random_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_RANDOM_INTERNAL_SEQUENCE_URBG_H_
diff --git a/third_party/abseil/src/absl/random/internal/traits.h b/third_party/abseil/src/absl/random/internal/traits.h
new file mode 100644
index 0000000..75772bd
--- /dev/null
+++ b/third_party/abseil/src/absl/random/internal/traits.h
@@ -0,0 +1,101 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_RANDOM_INTERNAL_TRAITS_H_
+#define ABSL_RANDOM_INTERNAL_TRAITS_H_
+
+#include <cstdint>
+#include <limits>
+#include <type_traits>
+
+#include "absl/base/config.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace random_internal {
+
+// random_internal::is_widening_convertible<A, B>
+//
+// Returns whether a type A is widening-convertible to a type B.
+//
+// A is widening-convertible to B means:
+// A a = <any number>;
+// B b = a;
+// A c = b;
+// EXPECT_EQ(a, c);
+template <typename A, typename B>
+class is_widening_convertible {
+ // As long as there are enough bits in the exact part of a number:
+ // - unsigned can fit in float, signed, unsigned
+ // - signed can fit in float, signed
+ // - float can fit in float
+ // So we define rank to be:
+ // - rank(float) -> 2
+ // - rank(signed) -> 1
+ // - rank(unsigned) -> 0
+ template <class T>
+ static constexpr int rank() {
+ return !std::numeric_limits<T>::is_integer +
+ std::numeric_limits<T>::is_signed;
+ }
+
+ public:
+ // If an arithmetic-type B can represent at least as many digits as a type A,
+ // and B belongs to a rank no lower than A, then A can be safely represented
+ // by B through a widening-conversion.
+ static constexpr bool value =
+ std::numeric_limits<A>::digits <= std::numeric_limits<B>::digits &&
+ rank<A>() <= rank<B>();
+};
+
+// unsigned_bits<N>::type returns the unsigned int type with the indicated
+// number of bits.
+template <size_t N>
+struct unsigned_bits;
+
+template <>
+struct unsigned_bits<8> {
+ using type = uint8_t;
+};
+template <>
+struct unsigned_bits<16> {
+ using type = uint16_t;
+};
+template <>
+struct unsigned_bits<32> {
+ using type = uint32_t;
+};
+template <>
+struct unsigned_bits<64> {
+ using type = uint64_t;
+};
+
+#ifdef ABSL_HAVE_INTRINSIC_INT128
+template <>
+struct unsigned_bits<128> {
+ using type = __uint128_t;
+};
+#endif
+
+template <typename IntType>
+struct make_unsigned_bits {
+ using type = typename unsigned_bits<std::numeric_limits<
+ typename std::make_unsigned<IntType>::type>::digits>::type;
+};
+
+} // namespace random_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_RANDOM_INTERNAL_TRAITS_H_
diff --git a/third_party/abseil/src/absl/random/internal/traits_test.cc b/third_party/abseil/src/absl/random/internal/traits_test.cc
new file mode 100644
index 0000000..a844887
--- /dev/null
+++ b/third_party/abseil/src/absl/random/internal/traits_test.cc
@@ -0,0 +1,126 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/random/internal/traits.h"
+
+#include <cstdint>
+#include <type_traits>
+
+#include "gtest/gtest.h"
+
+namespace {
+
+using absl::random_internal::is_widening_convertible;
+
+// CheckWideningConvertsToSelf<T1, T2, ...>()
+//
+// For each type T, checks:
+// - T IS widening-convertible to itself.
+//
+template <typename T>
+void CheckWideningConvertsToSelf() {
+ static_assert(is_widening_convertible<T, T>::value,
+ "Type is not convertible to self!");
+}
+
+template <typename T, typename Next, typename... Args>
+void CheckWideningConvertsToSelf() {
+ CheckWideningConvertsToSelf<T>();
+ CheckWideningConvertsToSelf<Next, Args...>();
+}
+
+// CheckNotWideningConvertibleWithSigned<T1, T2, ...>()
+//
+// For each unsigned-type T, checks that:
+// - T is NOT widening-convertible to Signed(T)
+// - Signed(T) is NOT widening-convertible to T
+//
+template <typename T>
+void CheckNotWideningConvertibleWithSigned() {
+ using signed_t = typename std::make_signed<T>::type;
+
+ static_assert(!is_widening_convertible<T, signed_t>::value,
+ "Unsigned type is convertible to same-sized signed-type!");
+ static_assert(!is_widening_convertible<signed_t, T>::value,
+ "Signed type is convertible to same-sized unsigned-type!");
+}
+
+template <typename T, typename Next, typename... Args>
+void CheckNotWideningConvertibleWithSigned() {
+ CheckNotWideningConvertibleWithSigned<T>();
+ CheckWideningConvertsToSelf<Next, Args...>();
+}
+
+// CheckWideningConvertsToLargerType<T1, T2, ...>()
+//
+// For each successive unsigned-types {Ti, Ti+1}, checks that:
+// - Ti IS widening-convertible to Ti+1
+// - Ti IS widening-convertible to Signed(Ti+1)
+// - Signed(Ti) is NOT widening-convertible to Ti
+// - Signed(Ti) IS widening-convertible to Ti+1
+template <typename T, typename Higher>
+void CheckWideningConvertsToLargerTypes() {
+ using signed_t = typename std::make_signed<T>::type;
+ using higher_t = Higher;
+ using signed_higher_t = typename std::make_signed<Higher>::type;
+
+ static_assert(is_widening_convertible<T, higher_t>::value,
+ "Type not embeddable into larger type!");
+ static_assert(is_widening_convertible<T, signed_higher_t>::value,
+ "Type not embeddable into larger signed type!");
+ static_assert(!is_widening_convertible<signed_t, higher_t>::value,
+ "Signed type is embeddable into larger unsigned type!");
+ static_assert(is_widening_convertible<signed_t, signed_higher_t>::value,
+ "Signed type not embeddable into larger signed type!");
+}
+
+template <typename T, typename Higher, typename Next, typename... Args>
+void CheckWideningConvertsToLargerTypes() {
+ CheckWideningConvertsToLargerTypes<T, Higher>();
+ CheckWideningConvertsToLargerTypes<Higher, Next, Args...>();
+}
+
+// CheckWideningConvertsTo<T, U, [expect]>
+//
+// Checks that T DOES widening-convert to U.
+// If "expect" is false, then asserts that T does NOT widening-convert to U.
+template <typename T, typename U, bool expect = true>
+void CheckWideningConvertsTo() {
+ static_assert(is_widening_convertible<T, U>::value == expect,
+ "Unexpected result for is_widening_convertible<T, U>!");
+}
+
+TEST(TraitsTest, IsWideningConvertibleTest) {
+ constexpr bool kInvalid = false;
+
+ CheckWideningConvertsToSelf<
+ uint8_t, uint16_t, uint32_t, uint64_t,
+ int8_t, int16_t, int32_t, int64_t,
+ float, double>();
+ CheckNotWideningConvertibleWithSigned<
+ uint8_t, uint16_t, uint32_t, uint64_t>();
+ CheckWideningConvertsToLargerTypes<
+ uint8_t, uint16_t, uint32_t, uint64_t>();
+
+ CheckWideningConvertsTo<float, double>();
+ CheckWideningConvertsTo<uint16_t, float>();
+ CheckWideningConvertsTo<uint32_t, double>();
+ CheckWideningConvertsTo<uint64_t, double, kInvalid>();
+ CheckWideningConvertsTo<double, float, kInvalid>();
+
+ CheckWideningConvertsTo<bool, int>();
+ CheckWideningConvertsTo<bool, float>();
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/random/internal/uniform_helper.h b/third_party/abseil/src/absl/random/internal/uniform_helper.h
new file mode 100644
index 0000000..1243bc1
--- /dev/null
+++ b/third_party/abseil/src/absl/random/internal/uniform_helper.h
@@ -0,0 +1,244 @@
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+#ifndef ABSL_RANDOM_INTERNAL_UNIFORM_HELPER_H_
+#define ABSL_RANDOM_INTERNAL_UNIFORM_HELPER_H_
+
+#include <cmath>
+#include <limits>
+#include <type_traits>
+
+#include "absl/base/config.h"
+#include "absl/meta/type_traits.h"
+#include "absl/random/internal/traits.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+template <typename IntType>
+class uniform_int_distribution;
+
+template <typename RealType>
+class uniform_real_distribution;
+
+// Interval tag types which specify whether the interval is open or closed
+// on either boundary.
+
+namespace random_internal {
+template <typename T>
+struct TagTypeCompare {};
+
+template <typename T>
+constexpr bool operator==(TagTypeCompare<T>, TagTypeCompare<T>) {
+ // Tags are mono-states. They always compare equal.
+ return true;
+}
+template <typename T>
+constexpr bool operator!=(TagTypeCompare<T>, TagTypeCompare<T>) {
+ return false;
+}
+
+} // namespace random_internal
+
+struct IntervalClosedClosedTag
+ : public random_internal::TagTypeCompare<IntervalClosedClosedTag> {};
+struct IntervalClosedOpenTag
+ : public random_internal::TagTypeCompare<IntervalClosedOpenTag> {};
+struct IntervalOpenClosedTag
+ : public random_internal::TagTypeCompare<IntervalOpenClosedTag> {};
+struct IntervalOpenOpenTag
+ : public random_internal::TagTypeCompare<IntervalOpenOpenTag> {};
+
+namespace random_internal {
+
+// In the absence of an explicitly provided return-type, the template
+// "uniform_inferred_return_t<A, B>" is used to derive a suitable type, based on
+// the data-types of the endpoint-arguments {A lo, B hi}.
+//
+// Given endpoints {A lo, B hi}, one of {A, B} will be chosen as the
+// return-type, if one type can be implicitly converted into the other, in a
+// lossless way. The template "is_widening_convertible" implements the
+// compile-time logic for deciding if such a conversion is possible.
+//
+// If no such conversion between {A, B} exists, then the overload for
+// absl::Uniform() will be discarded, and the call will be ill-formed.
+// Return-type for absl::Uniform() when the return-type is inferred.
+template <typename A, typename B>
+using uniform_inferred_return_t =
+ absl::enable_if_t<absl::disjunction<is_widening_convertible<A, B>,
+ is_widening_convertible<B, A>>::value,
+ typename std::conditional<
+ is_widening_convertible<A, B>::value, B, A>::type>;
+
+// The functions
+// uniform_lower_bound(tag, a, b)
+// and
+// uniform_upper_bound(tag, a, b)
+// are used as implementation-details for absl::Uniform().
+//
+// Conceptually,
+// [a, b] == [uniform_lower_bound(IntervalClosedClosed, a, b),
+// uniform_upper_bound(IntervalClosedClosed, a, b)]
+// (a, b) == [uniform_lower_bound(IntervalOpenOpen, a, b),
+// uniform_upper_bound(IntervalOpenOpen, a, b)]
+// [a, b) == [uniform_lower_bound(IntervalClosedOpen, a, b),
+// uniform_upper_bound(IntervalClosedOpen, a, b)]
+// (a, b] == [uniform_lower_bound(IntervalOpenClosed, a, b),
+// uniform_upper_bound(IntervalOpenClosed, a, b)]
+//
+template <typename IntType, typename Tag>
+typename absl::enable_if_t<
+ absl::conjunction<
+ std::is_integral<IntType>,
+ absl::disjunction<std::is_same<Tag, IntervalOpenClosedTag>,
+ std::is_same<Tag, IntervalOpenOpenTag>>>::value,
+ IntType>
+uniform_lower_bound(Tag, IntType a, IntType) {
+ return a < (std::numeric_limits<IntType>::max)() ? (a + 1) : a;
+}
+
+template <typename FloatType, typename Tag>
+typename absl::enable_if_t<
+ absl::conjunction<
+ std::is_floating_point<FloatType>,
+ absl::disjunction<std::is_same<Tag, IntervalOpenClosedTag>,
+ std::is_same<Tag, IntervalOpenOpenTag>>>::value,
+ FloatType>
+uniform_lower_bound(Tag, FloatType a, FloatType b) {
+ return std::nextafter(a, b);
+}
+
+template <typename NumType, typename Tag>
+typename absl::enable_if_t<
+ absl::disjunction<std::is_same<Tag, IntervalClosedClosedTag>,
+ std::is_same<Tag, IntervalClosedOpenTag>>::value,
+ NumType>
+uniform_lower_bound(Tag, NumType a, NumType) {
+ return a;
+}
+
+template <typename IntType, typename Tag>
+typename absl::enable_if_t<
+ absl::conjunction<
+ std::is_integral<IntType>,
+ absl::disjunction<std::is_same<Tag, IntervalClosedOpenTag>,
+ std::is_same<Tag, IntervalOpenOpenTag>>>::value,
+ IntType>
+uniform_upper_bound(Tag, IntType, IntType b) {
+ return b > (std::numeric_limits<IntType>::min)() ? (b - 1) : b;
+}
+
+template <typename FloatType, typename Tag>
+typename absl::enable_if_t<
+ absl::conjunction<
+ std::is_floating_point<FloatType>,
+ absl::disjunction<std::is_same<Tag, IntervalClosedOpenTag>,
+ std::is_same<Tag, IntervalOpenOpenTag>>>::value,
+ FloatType>
+uniform_upper_bound(Tag, FloatType, FloatType b) {
+ return b;
+}
+
+template <typename IntType, typename Tag>
+typename absl::enable_if_t<
+ absl::conjunction<
+ std::is_integral<IntType>,
+ absl::disjunction<std::is_same<Tag, IntervalClosedClosedTag>,
+ std::is_same<Tag, IntervalOpenClosedTag>>>::value,
+ IntType>
+uniform_upper_bound(Tag, IntType, IntType b) {
+ return b;
+}
+
+template <typename FloatType, typename Tag>
+typename absl::enable_if_t<
+ absl::conjunction<
+ std::is_floating_point<FloatType>,
+ absl::disjunction<std::is_same<Tag, IntervalClosedClosedTag>,
+ std::is_same<Tag, IntervalOpenClosedTag>>>::value,
+ FloatType>
+uniform_upper_bound(Tag, FloatType, FloatType b) {
+ return std::nextafter(b, (std::numeric_limits<FloatType>::max)());
+}
+
+// Returns whether the bounds are valid for the underlying distribution.
+// Inputs must have already been resolved via uniform_*_bound calls.
+//
+// The c++ standard constraints in [rand.dist.uni.int] are listed as:
+// requires: lo <= hi.
+//
+// In the uniform_int_distrubtion, {lo, hi} are closed, closed. Thus:
+// [0, 0] is legal.
+// [0, 0) is not legal, but [0, 1) is, which translates to [0, 0].
+// (0, 1) is not legal, but (0, 2) is, which translates to [1, 1].
+// (0, 0] is not legal, but (0, 1] is, which translates to [1, 1].
+//
+// The c++ standard constraints in [rand.dist.uni.real] are listed as:
+// requires: lo <= hi.
+// requires: (hi - lo) <= numeric_limits<T>::max()
+//
+// In the uniform_real_distribution, {lo, hi} are closed, open, Thus:
+// [0, 0] is legal, which is [0, 0+epsilon).
+// [0, 0) is legal.
+// (0, 0) is not legal, but (0-epsilon, 0+epsilon) is.
+// (0, 0] is not legal, but (0, 0+epsilon] is.
+//
+template <typename FloatType>
+absl::enable_if_t<std::is_floating_point<FloatType>::value, bool>
+is_uniform_range_valid(FloatType a, FloatType b) {
+ return a <= b && std::isfinite(b - a);
+}
+
+template <typename IntType>
+absl::enable_if_t<std::is_integral<IntType>::value, bool>
+is_uniform_range_valid(IntType a, IntType b) {
+ return a <= b;
+}
+
+// UniformDistribution selects either absl::uniform_int_distribution
+// or absl::uniform_real_distribution depending on the NumType parameter.
+template <typename NumType>
+using UniformDistribution =
+ typename std::conditional<std::is_integral<NumType>::value,
+ absl::uniform_int_distribution<NumType>,
+ absl::uniform_real_distribution<NumType>>::type;
+
+// UniformDistributionWrapper is used as the underlying distribution type
+// by the absl::Uniform template function. It selects the proper Abseil
+// uniform distribution and provides constructor overloads that match the
+// expected parameter order as well as adjusting distribtuion bounds based
+// on the tag.
+template <typename NumType>
+struct UniformDistributionWrapper : public UniformDistribution<NumType> {
+ template <typename TagType>
+ explicit UniformDistributionWrapper(TagType, NumType lo, NumType hi)
+ : UniformDistribution<NumType>(
+ uniform_lower_bound<NumType>(TagType{}, lo, hi),
+ uniform_upper_bound<NumType>(TagType{}, lo, hi)) {}
+
+ explicit UniformDistributionWrapper(NumType lo, NumType hi)
+ : UniformDistribution<NumType>(
+ uniform_lower_bound<NumType>(IntervalClosedOpenTag(), lo, hi),
+ uniform_upper_bound<NumType>(IntervalClosedOpenTag(), lo, hi)) {}
+
+ explicit UniformDistributionWrapper()
+ : UniformDistribution<NumType>(std::numeric_limits<NumType>::lowest(),
+ (std::numeric_limits<NumType>::max)()) {}
+};
+
+} // namespace random_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_RANDOM_INTERNAL_UNIFORM_HELPER_H_
diff --git a/third_party/abseil/src/absl/random/internal/uniform_helper_test.cc b/third_party/abseil/src/absl/random/internal/uniform_helper_test.cc
new file mode 100644
index 0000000..173c49b
--- /dev/null
+++ b/third_party/abseil/src/absl/random/internal/uniform_helper_test.cc
@@ -0,0 +1,279 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/random/internal/uniform_helper.h"
+
+#include <cmath>
+#include <cstdint>
+#include <random>
+
+#include "gtest/gtest.h"
+
+namespace {
+
+using absl::IntervalClosedClosedTag;
+using absl::IntervalClosedOpenTag;
+using absl::IntervalOpenClosedTag;
+using absl::IntervalOpenOpenTag;
+using absl::random_internal::uniform_inferred_return_t;
+using absl::random_internal::uniform_lower_bound;
+using absl::random_internal::uniform_upper_bound;
+
+class UniformHelperTest : public testing::Test {};
+
+TEST_F(UniformHelperTest, UniformBoundFunctionsGeneral) {
+ constexpr IntervalClosedClosedTag IntervalClosedClosed;
+ constexpr IntervalClosedOpenTag IntervalClosedOpen;
+ constexpr IntervalOpenClosedTag IntervalOpenClosed;
+ constexpr IntervalOpenOpenTag IntervalOpenOpen;
+
+ // absl::uniform_int_distribution natively assumes IntervalClosedClosed
+ // absl::uniform_real_distribution natively assumes IntervalClosedOpen
+
+ EXPECT_EQ(uniform_lower_bound(IntervalOpenClosed, 0, 100), 1);
+ EXPECT_EQ(uniform_lower_bound(IntervalOpenOpen, 0, 100), 1);
+ EXPECT_GT(uniform_lower_bound<float>(IntervalOpenClosed, 0, 1.0), 0);
+ EXPECT_GT(uniform_lower_bound<float>(IntervalOpenOpen, 0, 1.0), 0);
+ EXPECT_GT(uniform_lower_bound<double>(IntervalOpenClosed, 0, 1.0), 0);
+ EXPECT_GT(uniform_lower_bound<double>(IntervalOpenOpen, 0, 1.0), 0);
+
+ EXPECT_EQ(uniform_lower_bound(IntervalClosedClosed, 0, 100), 0);
+ EXPECT_EQ(uniform_lower_bound(IntervalClosedOpen, 0, 100), 0);
+ EXPECT_EQ(uniform_lower_bound<float>(IntervalClosedClosed, 0, 1.0), 0);
+ EXPECT_EQ(uniform_lower_bound<float>(IntervalClosedOpen, 0, 1.0), 0);
+ EXPECT_EQ(uniform_lower_bound<double>(IntervalClosedClosed, 0, 1.0), 0);
+ EXPECT_EQ(uniform_lower_bound<double>(IntervalClosedOpen, 0, 1.0), 0);
+
+ EXPECT_EQ(uniform_upper_bound(IntervalOpenOpen, 0, 100), 99);
+ EXPECT_EQ(uniform_upper_bound(IntervalClosedOpen, 0, 100), 99);
+ EXPECT_EQ(uniform_upper_bound<float>(IntervalOpenOpen, 0, 1.0), 1.0);
+ EXPECT_EQ(uniform_upper_bound<float>(IntervalClosedOpen, 0, 1.0), 1.0);
+ EXPECT_EQ(uniform_upper_bound<double>(IntervalOpenOpen, 0, 1.0), 1.0);
+ EXPECT_EQ(uniform_upper_bound<double>(IntervalClosedOpen, 0, 1.0), 1.0);
+
+ EXPECT_EQ(uniform_upper_bound(IntervalOpenClosed, 0, 100), 100);
+ EXPECT_EQ(uniform_upper_bound(IntervalClosedClosed, 0, 100), 100);
+ EXPECT_GT(uniform_upper_bound<float>(IntervalOpenClosed, 0, 1.0), 1.0);
+ EXPECT_GT(uniform_upper_bound<float>(IntervalClosedClosed, 0, 1.0), 1.0);
+ EXPECT_GT(uniform_upper_bound<double>(IntervalOpenClosed, 0, 1.0), 1.0);
+ EXPECT_GT(uniform_upper_bound<double>(IntervalClosedClosed, 0, 1.0), 1.0);
+
+ // Negative value tests
+ EXPECT_EQ(uniform_lower_bound(IntervalOpenClosed, -100, -1), -99);
+ EXPECT_EQ(uniform_lower_bound(IntervalOpenOpen, -100, -1), -99);
+ EXPECT_GT(uniform_lower_bound<float>(IntervalOpenClosed, -2.0, -1.0), -2.0);
+ EXPECT_GT(uniform_lower_bound<float>(IntervalOpenOpen, -2.0, -1.0), -2.0);
+ EXPECT_GT(uniform_lower_bound<double>(IntervalOpenClosed, -2.0, -1.0), -2.0);
+ EXPECT_GT(uniform_lower_bound<double>(IntervalOpenOpen, -2.0, -1.0), -2.0);
+
+ EXPECT_EQ(uniform_lower_bound(IntervalClosedClosed, -100, -1), -100);
+ EXPECT_EQ(uniform_lower_bound(IntervalClosedOpen, -100, -1), -100);
+ EXPECT_EQ(uniform_lower_bound<float>(IntervalClosedClosed, -2.0, -1.0), -2.0);
+ EXPECT_EQ(uniform_lower_bound<float>(IntervalClosedOpen, -2.0, -1.0), -2.0);
+ EXPECT_EQ(uniform_lower_bound<double>(IntervalClosedClosed, -2.0, -1.0),
+ -2.0);
+ EXPECT_EQ(uniform_lower_bound<double>(IntervalClosedOpen, -2.0, -1.0), -2.0);
+
+ EXPECT_EQ(uniform_upper_bound(IntervalOpenOpen, -100, -1), -2);
+ EXPECT_EQ(uniform_upper_bound(IntervalClosedOpen, -100, -1), -2);
+ EXPECT_EQ(uniform_upper_bound<float>(IntervalOpenOpen, -2.0, -1.0), -1.0);
+ EXPECT_EQ(uniform_upper_bound<float>(IntervalClosedOpen, -2.0, -1.0), -1.0);
+ EXPECT_EQ(uniform_upper_bound<double>(IntervalOpenOpen, -2.0, -1.0), -1.0);
+ EXPECT_EQ(uniform_upper_bound<double>(IntervalClosedOpen, -2.0, -1.0), -1.0);
+
+ EXPECT_EQ(uniform_upper_bound(IntervalOpenClosed, -100, -1), -1);
+ EXPECT_EQ(uniform_upper_bound(IntervalClosedClosed, -100, -1), -1);
+ EXPECT_GT(uniform_upper_bound<float>(IntervalOpenClosed, -2.0, -1.0), -1.0);
+ EXPECT_GT(uniform_upper_bound<float>(IntervalClosedClosed, -2.0, -1.0), -1.0);
+ EXPECT_GT(uniform_upper_bound<double>(IntervalOpenClosed, -2.0, -1.0), -1.0);
+ EXPECT_GT(uniform_upper_bound<double>(IntervalClosedClosed, -2.0, -1.0),
+ -1.0);
+
+ EXPECT_GT(uniform_lower_bound(IntervalOpenClosed, 1.0, 2.0), 1.0);
+ EXPECT_LT(uniform_lower_bound(IntervalOpenClosed, 1.0, +0.0), 1.0);
+ EXPECT_LT(uniform_lower_bound(IntervalOpenClosed, 1.0, -0.0), 1.0);
+ EXPECT_LT(uniform_lower_bound(IntervalOpenClosed, 1.0, -1.0), 1.0);
+}
+
+TEST_F(UniformHelperTest, UniformBoundFunctionsIntBounds) {
+ // Verifies the saturating nature of uniform_lower_bound and
+ // uniform_upper_bound
+ constexpr IntervalOpenOpenTag IntervalOpenOpen;
+
+ // uint max.
+ constexpr auto m = (std::numeric_limits<uint64_t>::max)();
+
+ EXPECT_EQ(1, uniform_lower_bound(IntervalOpenOpen, 0u, 0u));
+ EXPECT_EQ(m, uniform_lower_bound(IntervalOpenOpen, m, m));
+ EXPECT_EQ(m, uniform_lower_bound(IntervalOpenOpen, m - 1, m - 1));
+ EXPECT_EQ(0, uniform_upper_bound(IntervalOpenOpen, 0u, 0u));
+ EXPECT_EQ(m - 1, uniform_upper_bound(IntervalOpenOpen, m, m));
+
+ // int min/max
+ constexpr auto l = (std::numeric_limits<int64_t>::min)();
+ constexpr auto r = (std::numeric_limits<int64_t>::max)();
+ EXPECT_EQ(1, uniform_lower_bound(IntervalOpenOpen, 0, 0));
+ EXPECT_EQ(l + 1, uniform_lower_bound(IntervalOpenOpen, l, l));
+ EXPECT_EQ(r, uniform_lower_bound(IntervalOpenOpen, r - 1, r - 1));
+ EXPECT_EQ(r, uniform_lower_bound(IntervalOpenOpen, r, r));
+ EXPECT_EQ(-1, uniform_upper_bound(IntervalOpenOpen, 0, 0));
+ EXPECT_EQ(l, uniform_upper_bound(IntervalOpenOpen, l, l));
+ EXPECT_EQ(r - 1, uniform_upper_bound(IntervalOpenOpen, r, r));
+}
+
+TEST_F(UniformHelperTest, UniformBoundFunctionsRealBounds) {
+ // absl::uniform_real_distribution natively assumes IntervalClosedOpen;
+ // use the inverse here so each bound has to change.
+ constexpr IntervalOpenClosedTag IntervalOpenClosed;
+
+ // Edge cases: the next value toward itself is itself.
+ EXPECT_EQ(1.0, uniform_lower_bound(IntervalOpenClosed, 1.0, 1.0));
+ EXPECT_EQ(1.0f, uniform_lower_bound(IntervalOpenClosed, 1.0f, 1.0f));
+
+ // rightmost and leftmost finite values.
+ constexpr auto r = (std::numeric_limits<double>::max)();
+ const auto re = std::nexttoward(r, 0.0);
+ constexpr auto l = -r;
+ const auto le = std::nexttoward(l, 0.0);
+
+ EXPECT_EQ(l, uniform_lower_bound(IntervalOpenClosed, l, l)); // (l,l)
+ EXPECT_EQ(r, uniform_lower_bound(IntervalOpenClosed, r, r)); // (r,r)
+ EXPECT_EQ(le, uniform_lower_bound(IntervalOpenClosed, l, r)); // (l,r)
+ EXPECT_EQ(le, uniform_lower_bound(IntervalOpenClosed, l, 0.0)); // (l, 0)
+ EXPECT_EQ(le, uniform_lower_bound(IntervalOpenClosed, l, le)); // (l, le)
+ EXPECT_EQ(r, uniform_lower_bound(IntervalOpenClosed, re, r)); // (re, r)
+
+ EXPECT_EQ(le, uniform_upper_bound(IntervalOpenClosed, l, l)); // (l,l)
+ EXPECT_EQ(r, uniform_upper_bound(IntervalOpenClosed, r, r)); // (r,r)
+ EXPECT_EQ(r, uniform_upper_bound(IntervalOpenClosed, l, r)); // (l,r)
+ EXPECT_EQ(r, uniform_upper_bound(IntervalOpenClosed, l, re)); // (l,re)
+ EXPECT_EQ(r, uniform_upper_bound(IntervalOpenClosed, 0.0, r)); // (0, r)
+ EXPECT_EQ(r, uniform_upper_bound(IntervalOpenClosed, re, r)); // (re, r)
+ EXPECT_EQ(r, uniform_upper_bound(IntervalOpenClosed, le, re)); // (le, re)
+
+ const double e = std::nextafter(1.0, 2.0); // 1 + epsilon
+ const double f = std::nextafter(1.0, 0.0); // 1 - epsilon
+
+ // (1.0, 1.0 + epsilon)
+ EXPECT_EQ(e, uniform_lower_bound(IntervalOpenClosed, 1.0, e));
+ EXPECT_EQ(std::nextafter(e, 2.0),
+ uniform_upper_bound(IntervalOpenClosed, 1.0, e));
+
+ // (1.0-epsilon, 1.0)
+ EXPECT_EQ(1.0, uniform_lower_bound(IntervalOpenClosed, f, 1.0));
+ EXPECT_EQ(e, uniform_upper_bound(IntervalOpenClosed, f, 1.0));
+
+ // denorm cases.
+ const double g = std::numeric_limits<double>::denorm_min();
+ const double h = std::nextafter(g, 1.0);
+
+ // (0, denorm_min)
+ EXPECT_EQ(g, uniform_lower_bound(IntervalOpenClosed, 0.0, g));
+ EXPECT_EQ(h, uniform_upper_bound(IntervalOpenClosed, 0.0, g));
+
+ // (denorm_min, 1.0)
+ EXPECT_EQ(h, uniform_lower_bound(IntervalOpenClosed, g, 1.0));
+ EXPECT_EQ(e, uniform_upper_bound(IntervalOpenClosed, g, 1.0));
+
+ // Edge cases: invalid bounds.
+ EXPECT_EQ(f, uniform_lower_bound(IntervalOpenClosed, 1.0, -1.0));
+}
+
+struct Invalid {};
+
+template <typename A, typename B>
+auto InferredUniformReturnT(int) -> uniform_inferred_return_t<A, B>;
+
+template <typename, typename>
+Invalid InferredUniformReturnT(...);
+
+// Given types <A, B, Expect>, CheckArgsInferType() verifies that
+//
+// uniform_inferred_return_t<A, B> and
+// uniform_inferred_return_t<B, A>
+//
+// returns the type "Expect".
+//
+// This interface can also be used to assert that a given inferred return types
+// are invalid. Writing:
+//
+// CheckArgsInferType<float, int, Invalid>()
+//
+// will assert that this overload does not exist.
+template <typename A, typename B, typename Expect>
+void CheckArgsInferType() {
+ static_assert(
+ absl::conjunction<
+ std::is_same<Expect, decltype(InferredUniformReturnT<A, B>(0))>,
+ std::is_same<Expect,
+ decltype(InferredUniformReturnT<B, A>(0))>>::value,
+ "");
+}
+
+TEST_F(UniformHelperTest, UniformTypeInference) {
+ // Infers common types.
+ CheckArgsInferType<uint16_t, uint16_t, uint16_t>();
+ CheckArgsInferType<uint32_t, uint32_t, uint32_t>();
+ CheckArgsInferType<uint64_t, uint64_t, uint64_t>();
+ CheckArgsInferType<int16_t, int16_t, int16_t>();
+ CheckArgsInferType<int32_t, int32_t, int32_t>();
+ CheckArgsInferType<int64_t, int64_t, int64_t>();
+ CheckArgsInferType<float, float, float>();
+ CheckArgsInferType<double, double, double>();
+
+ // Properly promotes uint16_t.
+ CheckArgsInferType<uint16_t, uint32_t, uint32_t>();
+ CheckArgsInferType<uint16_t, uint64_t, uint64_t>();
+ CheckArgsInferType<uint16_t, int32_t, int32_t>();
+ CheckArgsInferType<uint16_t, int64_t, int64_t>();
+ CheckArgsInferType<uint16_t, float, float>();
+ CheckArgsInferType<uint16_t, double, double>();
+
+ // Properly promotes int16_t.
+ CheckArgsInferType<int16_t, int32_t, int32_t>();
+ CheckArgsInferType<int16_t, int64_t, int64_t>();
+ CheckArgsInferType<int16_t, float, float>();
+ CheckArgsInferType<int16_t, double, double>();
+
+ // Invalid (u)int16_t-pairings do not compile.
+ // See "CheckArgsInferType" comments above, for how this is achieved.
+ CheckArgsInferType<uint16_t, int16_t, Invalid>();
+ CheckArgsInferType<int16_t, uint32_t, Invalid>();
+ CheckArgsInferType<int16_t, uint64_t, Invalid>();
+
+ // Properly promotes uint32_t.
+ CheckArgsInferType<uint32_t, uint64_t, uint64_t>();
+ CheckArgsInferType<uint32_t, int64_t, int64_t>();
+ CheckArgsInferType<uint32_t, double, double>();
+
+ // Properly promotes int32_t.
+ CheckArgsInferType<int32_t, int64_t, int64_t>();
+ CheckArgsInferType<int32_t, double, double>();
+
+ // Invalid (u)int32_t-pairings do not compile.
+ CheckArgsInferType<uint32_t, int32_t, Invalid>();
+ CheckArgsInferType<int32_t, uint64_t, Invalid>();
+ CheckArgsInferType<int32_t, float, Invalid>();
+ CheckArgsInferType<uint32_t, float, Invalid>();
+
+ // Invalid (u)int64_t-pairings do not compile.
+ CheckArgsInferType<uint64_t, int64_t, Invalid>();
+ CheckArgsInferType<int64_t, float, Invalid>();
+ CheckArgsInferType<int64_t, double, Invalid>();
+
+ // Properly promotes float.
+ CheckArgsInferType<float, double, double>();
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/random/internal/wide_multiply.h b/third_party/abseil/src/absl/random/internal/wide_multiply.h
new file mode 100644
index 0000000..0afcbe0
--- /dev/null
+++ b/third_party/abseil/src/absl/random/internal/wide_multiply.h
@@ -0,0 +1,111 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_RANDOM_INTERNAL_WIDE_MULTIPLY_H_
+#define ABSL_RANDOM_INTERNAL_WIDE_MULTIPLY_H_
+
+#include <cstdint>
+#include <limits>
+#include <type_traits>
+
+#if (defined(_WIN32) || defined(_WIN64)) && defined(_M_IA64)
+#include <intrin.h> // NOLINT(build/include_order)
+#pragma intrinsic(_umul128)
+#define ABSL_INTERNAL_USE_UMUL128 1
+#endif
+
+#include "absl/base/config.h"
+#include "absl/base/internal/bits.h"
+#include "absl/numeric/int128.h"
+#include "absl/random/internal/traits.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace random_internal {
+
+// Helper object to multiply two 64-bit values to a 128-bit value.
+// MultiplyU64ToU128 multiplies two 64-bit values to a 128-bit value.
+// If an intrinsic is available, it is used, otherwise use native 32-bit
+// multiplies to construct the result.
+inline absl::uint128 MultiplyU64ToU128(uint64_t a, uint64_t b) {
+#if defined(ABSL_HAVE_INTRINSIC_INT128)
+ return absl::uint128(static_cast<__uint128_t>(a) * b);
+#elif defined(ABSL_INTERNAL_USE_UMUL128)
+ // uint64_t * uint64_t => uint128 multiply using imul intrinsic on MSVC.
+ uint64_t high = 0;
+ const uint64_t low = _umul128(a, b, &high);
+ return absl::MakeUint128(high, low);
+#else
+ // uint128(a) * uint128(b) in emulated mode computes a full 128-bit x 128-bit
+ // multiply. However there are many cases where that is not necessary, and it
+ // is only necessary to support a 64-bit x 64-bit = 128-bit multiply. This is
+ // for those cases.
+ const uint64_t a00 = static_cast<uint32_t>(a);
+ const uint64_t a32 = a >> 32;
+ const uint64_t b00 = static_cast<uint32_t>(b);
+ const uint64_t b32 = b >> 32;
+
+ const uint64_t c00 = a00 * b00;
+ const uint64_t c32a = a00 * b32;
+ const uint64_t c32b = a32 * b00;
+ const uint64_t c64 = a32 * b32;
+
+ const uint32_t carry =
+ static_cast<uint32_t>(((c00 >> 32) + static_cast<uint32_t>(c32a) +
+ static_cast<uint32_t>(c32b)) >>
+ 32);
+
+ return absl::MakeUint128(c64 + (c32a >> 32) + (c32b >> 32) + carry,
+ c00 + (c32a << 32) + (c32b << 32));
+#endif
+}
+
+// wide_multiply<T> multiplies two N-bit values to a 2N-bit result.
+template <typename UIntType>
+struct wide_multiply {
+ static constexpr size_t kN = std::numeric_limits<UIntType>::digits;
+ using input_type = UIntType;
+ using result_type = typename random_internal::unsigned_bits<kN * 2>::type;
+
+ static result_type multiply(input_type a, input_type b) {
+ return static_cast<result_type>(a) * b;
+ }
+
+ static input_type hi(result_type r) { return r >> kN; }
+ static input_type lo(result_type r) { return r; }
+
+ static_assert(std::is_unsigned<UIntType>::value,
+ "Class-template wide_multiply<> argument must be unsigned.");
+};
+
+#ifndef ABSL_HAVE_INTRINSIC_INT128
+template <>
+struct wide_multiply<uint64_t> {
+ using input_type = uint64_t;
+ using result_type = absl::uint128;
+
+ static result_type multiply(uint64_t a, uint64_t b) {
+ return MultiplyU64ToU128(a, b);
+ }
+
+ static uint64_t hi(result_type r) { return absl::Uint128High64(r); }
+ static uint64_t lo(result_type r) { return absl::Uint128Low64(r); }
+};
+#endif
+
+} // namespace random_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_RANDOM_INTERNAL_WIDE_MULTIPLY_H_
diff --git a/third_party/abseil/src/absl/random/internal/wide_multiply_test.cc b/third_party/abseil/src/absl/random/internal/wide_multiply_test.cc
new file mode 100644
index 0000000..ca8ce92
--- /dev/null
+++ b/third_party/abseil/src/absl/random/internal/wide_multiply_test.cc
@@ -0,0 +1,66 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/random/internal/wide_multiply.h"
+
+#include "gtest/gtest.h"
+#include "absl/base/internal/bits.h"
+#include "absl/numeric/int128.h"
+
+using absl::random_internal::MultiplyU64ToU128;
+
+namespace {
+
+TEST(WideMultiplyTest, MultiplyU64ToU128Test) {
+ constexpr uint64_t k1 = 1;
+ constexpr uint64_t kMax = ~static_cast<uint64_t>(0);
+
+ EXPECT_EQ(absl::uint128(0), MultiplyU64ToU128(0, 0));
+
+ // Max uint64_t
+ EXPECT_EQ(MultiplyU64ToU128(kMax, kMax),
+ absl::MakeUint128(0xfffffffffffffffe, 0x0000000000000001));
+ EXPECT_EQ(absl::MakeUint128(0, kMax), MultiplyU64ToU128(kMax, 1));
+ EXPECT_EQ(absl::MakeUint128(0, kMax), MultiplyU64ToU128(1, kMax));
+ for (int i = 0; i < 64; ++i) {
+ EXPECT_EQ(absl::MakeUint128(0, kMax) << i,
+ MultiplyU64ToU128(kMax, k1 << i));
+ EXPECT_EQ(absl::MakeUint128(0, kMax) << i,
+ MultiplyU64ToU128(k1 << i, kMax));
+ }
+
+ // 1-bit x 1-bit.
+ for (int i = 0; i < 64; ++i) {
+ for (int j = 0; j < 64; ++j) {
+ EXPECT_EQ(absl::MakeUint128(0, 1) << (i + j),
+ MultiplyU64ToU128(k1 << i, k1 << j));
+ EXPECT_EQ(absl::MakeUint128(0, 1) << (i + j),
+ MultiplyU64ToU128(k1 << i, k1 << j));
+ }
+ }
+
+ // Verified multiplies
+ EXPECT_EQ(MultiplyU64ToU128(0xffffeeeeddddcccc, 0xbbbbaaaa99998888),
+ absl::MakeUint128(0xbbbb9e2692c5dddc, 0xc28f7531048d2c60));
+ EXPECT_EQ(MultiplyU64ToU128(0x0123456789abcdef, 0xfedcba9876543210),
+ absl::MakeUint128(0x0121fa00ad77d742, 0x2236d88fe5618cf0));
+ EXPECT_EQ(MultiplyU64ToU128(0x0123456789abcdef, 0xfdb97531eca86420),
+ absl::MakeUint128(0x0120ae99d26725fc, 0xce197f0ecac319e0));
+ EXPECT_EQ(MultiplyU64ToU128(0x97a87f4f261ba3f2, 0xfedcba9876543210),
+ absl::MakeUint128(0x96fbf1a8ae78d0ba, 0x5a6dd4b71f278320));
+ EXPECT_EQ(MultiplyU64ToU128(0xfedcba9876543210, 0xfdb97531eca86420),
+ absl::MakeUint128(0xfc98c6981a413e22, 0x342d0bbf48948200));
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/random/log_uniform_int_distribution.h b/third_party/abseil/src/absl/random/log_uniform_int_distribution.h
new file mode 100644
index 0000000..960816e
--- /dev/null
+++ b/third_party/abseil/src/absl/random/log_uniform_int_distribution.h
@@ -0,0 +1,254 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_RANDOM_LOG_UNIFORM_INT_DISTRIBUTION_H_
+#define ABSL_RANDOM_LOG_UNIFORM_INT_DISTRIBUTION_H_
+
+#include <algorithm>
+#include <cassert>
+#include <cmath>
+#include <istream>
+#include <limits>
+#include <ostream>
+#include <type_traits>
+
+#include "absl/random/internal/fastmath.h"
+#include "absl/random/internal/generate_real.h"
+#include "absl/random/internal/iostream_state_saver.h"
+#include "absl/random/internal/traits.h"
+#include "absl/random/uniform_int_distribution.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+// log_uniform_int_distribution:
+//
+// Returns a random variate R in range [min, max] such that
+// floor(log(R-min, base)) is uniformly distributed.
+// We ensure uniformity by discretization using the
+// boundary sets [0, 1, base, base * base, ... min(base*n, max)]
+//
+template <typename IntType = int>
+class log_uniform_int_distribution {
+ private:
+ using unsigned_type =
+ typename random_internal::make_unsigned_bits<IntType>::type;
+
+ public:
+ using result_type = IntType;
+
+ class param_type {
+ public:
+ using distribution_type = log_uniform_int_distribution;
+
+ explicit param_type(
+ result_type min = 0,
+ result_type max = (std::numeric_limits<result_type>::max)(),
+ result_type base = 2)
+ : min_(min),
+ max_(max),
+ base_(base),
+ range_(static_cast<unsigned_type>(max_) -
+ static_cast<unsigned_type>(min_)),
+ log_range_(0) {
+ assert(max_ >= min_);
+ assert(base_ > 1);
+
+ if (base_ == 2) {
+ // Determine where the first set bit is on range(), giving a log2(range)
+ // value which can be used to construct bounds.
+ log_range_ = (std::min)(random_internal::LeadingSetBit(range()),
+ std::numeric_limits<unsigned_type>::digits);
+ } else {
+ // NOTE: Computing the logN(x) introduces error from 2 sources:
+ // 1. Conversion of int to double loses precision for values >=
+ // 2^53, which may cause some log() computations to operate on
+ // different values.
+ // 2. The error introduced by the division will cause the result
+ // to differ from the expected value.
+ //
+ // Thus a result which should equal K may equal K +/- epsilon,
+ // which can eliminate some values depending on where the bounds fall.
+ const double inv_log_base = 1.0 / std::log(base_);
+ const double log_range = std::log(static_cast<double>(range()) + 0.5);
+ log_range_ = static_cast<int>(std::ceil(inv_log_base * log_range));
+ }
+ }
+
+ result_type(min)() const { return min_; }
+ result_type(max)() const { return max_; }
+ result_type base() const { return base_; }
+
+ friend bool operator==(const param_type& a, const param_type& b) {
+ return a.min_ == b.min_ && a.max_ == b.max_ && a.base_ == b.base_;
+ }
+
+ friend bool operator!=(const param_type& a, const param_type& b) {
+ return !(a == b);
+ }
+
+ private:
+ friend class log_uniform_int_distribution;
+
+ int log_range() const { return log_range_; }
+ unsigned_type range() const { return range_; }
+
+ result_type min_;
+ result_type max_;
+ result_type base_;
+ unsigned_type range_; // max - min
+ int log_range_; // ceil(logN(range_))
+
+ static_assert(std::is_integral<IntType>::value,
+ "Class-template absl::log_uniform_int_distribution<> must be "
+ "parameterized using an integral type.");
+ };
+
+ log_uniform_int_distribution() : log_uniform_int_distribution(0) {}
+
+ explicit log_uniform_int_distribution(
+ result_type min,
+ result_type max = (std::numeric_limits<result_type>::max)(),
+ result_type base = 2)
+ : param_(min, max, base) {}
+
+ explicit log_uniform_int_distribution(const param_type& p) : param_(p) {}
+
+ void reset() {}
+
+ // generating functions
+ template <typename URBG>
+ result_type operator()(URBG& g) { // NOLINT(runtime/references)
+ return (*this)(g, param_);
+ }
+
+ template <typename URBG>
+ result_type operator()(URBG& g, // NOLINT(runtime/references)
+ const param_type& p) {
+ return (p.min)() + Generate(g, p);
+ }
+
+ result_type(min)() const { return (param_.min)(); }
+ result_type(max)() const { return (param_.max)(); }
+ result_type base() const { return param_.base(); }
+
+ param_type param() const { return param_; }
+ void param(const param_type& p) { param_ = p; }
+
+ friend bool operator==(const log_uniform_int_distribution& a,
+ const log_uniform_int_distribution& b) {
+ return a.param_ == b.param_;
+ }
+ friend bool operator!=(const log_uniform_int_distribution& a,
+ const log_uniform_int_distribution& b) {
+ return a.param_ != b.param_;
+ }
+
+ private:
+ // Returns a log-uniform variate in the range [0, p.range()]. The caller
+ // should add min() to shift the result to the correct range.
+ template <typename URNG>
+ unsigned_type Generate(URNG& g, // NOLINT(runtime/references)
+ const param_type& p);
+
+ param_type param_;
+};
+
+template <typename IntType>
+template <typename URBG>
+typename log_uniform_int_distribution<IntType>::unsigned_type
+log_uniform_int_distribution<IntType>::Generate(
+ URBG& g, // NOLINT(runtime/references)
+ const param_type& p) {
+ // sample e over [0, log_range]. Map the results of e to this:
+ // 0 => 0
+ // 1 => [1, b-1]
+ // 2 => [b, (b^2)-1]
+ // n => [b^(n-1)..(b^n)-1]
+ const int e = absl::uniform_int_distribution<int>(0, p.log_range())(g);
+ if (e == 0) {
+ return 0;
+ }
+ const int d = e - 1;
+
+ unsigned_type base_e, top_e;
+ if (p.base() == 2) {
+ base_e = static_cast<unsigned_type>(1) << d;
+
+ top_e = (e >= std::numeric_limits<unsigned_type>::digits)
+ ? (std::numeric_limits<unsigned_type>::max)()
+ : (static_cast<unsigned_type>(1) << e) - 1;
+ } else {
+ const double r = std::pow(p.base(), d);
+ const double s = (r * p.base()) - 1.0;
+
+ base_e =
+ (r > static_cast<double>((std::numeric_limits<unsigned_type>::max)()))
+ ? (std::numeric_limits<unsigned_type>::max)()
+ : static_cast<unsigned_type>(r);
+
+ top_e =
+ (s > static_cast<double>((std::numeric_limits<unsigned_type>::max)()))
+ ? (std::numeric_limits<unsigned_type>::max)()
+ : static_cast<unsigned_type>(s);
+ }
+
+ const unsigned_type lo = (base_e >= p.range()) ? p.range() : base_e;
+ const unsigned_type hi = (top_e >= p.range()) ? p.range() : top_e;
+
+ // choose uniformly over [lo, hi]
+ return absl::uniform_int_distribution<result_type>(lo, hi)(g);
+}
+
+template <typename CharT, typename Traits, typename IntType>
+std::basic_ostream<CharT, Traits>& operator<<(
+ std::basic_ostream<CharT, Traits>& os, // NOLINT(runtime/references)
+ const log_uniform_int_distribution<IntType>& x) {
+ using stream_type =
+ typename random_internal::stream_format_type<IntType>::type;
+ auto saver = random_internal::make_ostream_state_saver(os);
+ os << static_cast<stream_type>((x.min)()) << os.fill()
+ << static_cast<stream_type>((x.max)()) << os.fill()
+ << static_cast<stream_type>(x.base());
+ return os;
+}
+
+template <typename CharT, typename Traits, typename IntType>
+std::basic_istream<CharT, Traits>& operator>>(
+ std::basic_istream<CharT, Traits>& is, // NOLINT(runtime/references)
+ log_uniform_int_distribution<IntType>& x) { // NOLINT(runtime/references)
+ using param_type = typename log_uniform_int_distribution<IntType>::param_type;
+ using result_type =
+ typename log_uniform_int_distribution<IntType>::result_type;
+ using stream_type =
+ typename random_internal::stream_format_type<IntType>::type;
+
+ stream_type min;
+ stream_type max;
+ stream_type base;
+
+ auto saver = random_internal::make_istream_state_saver(is);
+ is >> min >> max >> base;
+ if (!is.fail()) {
+ x.param(param_type(static_cast<result_type>(min),
+ static_cast<result_type>(max),
+ static_cast<result_type>(base)));
+ }
+ return is;
+}
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_RANDOM_LOG_UNIFORM_INT_DISTRIBUTION_H_
diff --git a/third_party/abseil/src/absl/random/log_uniform_int_distribution_test.cc b/third_party/abseil/src/absl/random/log_uniform_int_distribution_test.cc
new file mode 100644
index 0000000..5e780d9
--- /dev/null
+++ b/third_party/abseil/src/absl/random/log_uniform_int_distribution_test.cc
@@ -0,0 +1,280 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/random/log_uniform_int_distribution.h"
+
+#include <cstddef>
+#include <cstdint>
+#include <iterator>
+#include <random>
+#include <sstream>
+#include <string>
+#include <vector>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/base/internal/raw_logging.h"
+#include "absl/random/internal/chi_square.h"
+#include "absl/random/internal/distribution_test_util.h"
+#include "absl/random/internal/pcg_engine.h"
+#include "absl/random/internal/sequence_urbg.h"
+#include "absl/random/random.h"
+#include "absl/strings/str_cat.h"
+#include "absl/strings/str_format.h"
+#include "absl/strings/str_replace.h"
+#include "absl/strings/strip.h"
+
+namespace {
+
+template <typename IntType>
+class LogUniformIntDistributionTypeTest : public ::testing::Test {};
+
+using IntTypes = ::testing::Types<int8_t, int16_t, int32_t, int64_t, //
+ uint8_t, uint16_t, uint32_t, uint64_t>;
+TYPED_TEST_CASE(LogUniformIntDistributionTypeTest, IntTypes);
+
+TYPED_TEST(LogUniformIntDistributionTypeTest, SerializeTest) {
+ using param_type =
+ typename absl::log_uniform_int_distribution<TypeParam>::param_type;
+ using Limits = std::numeric_limits<TypeParam>;
+
+ constexpr int kCount = 1000;
+ absl::InsecureBitGen gen;
+ for (const auto& param : {
+ param_type(0, 1), //
+ param_type(0, 2), //
+ param_type(0, 2, 10), //
+ param_type(9, 32, 4), //
+ param_type(1, 101, 10), //
+ param_type(1, Limits::max() / 2), //
+ param_type(0, Limits::max() - 1), //
+ param_type(0, Limits::max(), 2), //
+ param_type(0, Limits::max(), 10), //
+ param_type(Limits::min(), 0), //
+ param_type(Limits::lowest(), Limits::max()), //
+ param_type(Limits::min(), Limits::max()), //
+ }) {
+ // Validate parameters.
+ const auto min = param.min();
+ const auto max = param.max();
+ const auto base = param.base();
+ absl::log_uniform_int_distribution<TypeParam> before(min, max, base);
+ EXPECT_EQ(before.min(), param.min());
+ EXPECT_EQ(before.max(), param.max());
+ EXPECT_EQ(before.base(), param.base());
+
+ {
+ absl::log_uniform_int_distribution<TypeParam> via_param(param);
+ EXPECT_EQ(via_param, before);
+ }
+
+ // Validate stream serialization.
+ std::stringstream ss;
+ ss << before;
+
+ absl::log_uniform_int_distribution<TypeParam> after(3, 6, 17);
+
+ EXPECT_NE(before.max(), after.max());
+ EXPECT_NE(before.base(), after.base());
+ EXPECT_NE(before.param(), after.param());
+ EXPECT_NE(before, after);
+
+ ss >> after;
+
+ EXPECT_EQ(before.min(), after.min());
+ EXPECT_EQ(before.max(), after.max());
+ EXPECT_EQ(before.base(), after.base());
+ EXPECT_EQ(before.param(), after.param());
+ EXPECT_EQ(before, after);
+
+ // Smoke test.
+ auto sample_min = after.max();
+ auto sample_max = after.min();
+ for (int i = 0; i < kCount; i++) {
+ auto sample = after(gen);
+ EXPECT_GE(sample, after.min());
+ EXPECT_LE(sample, after.max());
+ if (sample > sample_max) sample_max = sample;
+ if (sample < sample_min) sample_min = sample;
+ }
+ ABSL_INTERNAL_LOG(INFO,
+ absl::StrCat("Range: ", +sample_min, ", ", +sample_max));
+ }
+}
+
+using log_uniform_i32 = absl::log_uniform_int_distribution<int32_t>;
+
+class LogUniformIntChiSquaredTest
+ : public testing::TestWithParam<log_uniform_i32::param_type> {
+ public:
+ // The ChiSquaredTestImpl provides a chi-squared goodness of fit test for
+ // data generated by the log-uniform-int distribution.
+ double ChiSquaredTestImpl();
+
+ // We use a fixed bit generator for distribution accuracy tests. This allows
+ // these tests to be deterministic, while still testing the qualify of the
+ // implementation.
+ absl::random_internal::pcg64_2018_engine rng_{0x2B7E151628AED2A6};
+};
+
+double LogUniformIntChiSquaredTest::ChiSquaredTestImpl() {
+ using absl::random_internal::kChiSquared;
+
+ const auto& param = GetParam();
+
+ // Check the distribution of L=log(log_uniform_int_distribution, base),
+ // expecting that L is roughly uniformly distributed, that is:
+ //
+ // P[L=0] ~= P[L=1] ~= ... ~= P[L=log(max)]
+ //
+ // For a total of X entries, each bucket should contain some number of samples
+ // in the interval [X/k - a, X/k + a].
+ //
+ // Where `a` is approximately sqrt(X/k). This is validated by bucketing
+ // according to the log function and using a chi-squared test for uniformity.
+
+ const bool is_2 = (param.base() == 2);
+ const double base_log = 1.0 / std::log(param.base());
+ const auto bucket_index = [base_log, is_2, ¶m](int32_t x) {
+ uint64_t y = static_cast<uint64_t>(x) - param.min();
+ return (y == 0) ? 0
+ : is_2 ? static_cast<int>(1 + std::log2(y))
+ : static_cast<int>(1 + std::log(y) * base_log);
+ };
+ const int max_bucket = bucket_index(param.max()); // inclusive
+ const size_t trials = 15 + (max_bucket + 1) * 10;
+
+ log_uniform_i32 dist(param);
+
+ std::vector<int64_t> buckets(max_bucket + 1);
+ for (size_t i = 0; i < trials; ++i) {
+ const auto sample = dist(rng_);
+ // Check the bounds.
+ ABSL_ASSERT(sample <= dist.max());
+ ABSL_ASSERT(sample >= dist.min());
+ // Convert the output of the generator to one of num_bucket buckets.
+ int bucket = bucket_index(sample);
+ ABSL_ASSERT(bucket <= max_bucket);
+ ++buckets[bucket];
+ }
+
+ // The null-hypothesis is that the distribution is uniform with respect to
+ // log-uniform-int bucketization.
+ const int dof = buckets.size() - 1;
+ const double expected = trials / static_cast<double>(buckets.size());
+
+ const double threshold = absl::random_internal::ChiSquareValue(dof, 0.98);
+
+ double chi_square = absl::random_internal::ChiSquareWithExpected(
+ std::begin(buckets), std::end(buckets), expected);
+
+ const double p = absl::random_internal::ChiSquarePValue(chi_square, dof);
+
+ if (chi_square > threshold) {
+ ABSL_INTERNAL_LOG(INFO, "values");
+ for (size_t i = 0; i < buckets.size(); i++) {
+ ABSL_INTERNAL_LOG(INFO, absl::StrCat(i, ": ", buckets[i]));
+ }
+ ABSL_INTERNAL_LOG(INFO,
+ absl::StrFormat("trials=%d\n"
+ "%s(data, %d) = %f (%f)\n"
+ "%s @ 0.98 = %f",
+ trials, kChiSquared, dof, chi_square, p,
+ kChiSquared, threshold));
+ }
+ return p;
+}
+
+TEST_P(LogUniformIntChiSquaredTest, MultiTest) {
+ const int kTrials = 5;
+ int failures = 0;
+ for (int i = 0; i < kTrials; i++) {
+ double p_value = ChiSquaredTestImpl();
+ if (p_value < 0.005) {
+ failures++;
+ }
+ }
+
+ // There is a 0.10% chance of producing at least one failure, so raise the
+ // failure threshold high enough to allow for a flake rate < 10,000.
+ EXPECT_LE(failures, 4);
+}
+
+// Generate the parameters for the test.
+std::vector<log_uniform_i32::param_type> GenParams() {
+ using Param = log_uniform_i32::param_type;
+ using Limits = std::numeric_limits<int32_t>;
+
+ return std::vector<Param>{
+ Param{0, 1, 2},
+ Param{1, 1, 2},
+ Param{0, 2, 2},
+ Param{0, 3, 2},
+ Param{0, 4, 2},
+ Param{0, 9, 10},
+ Param{0, 10, 10},
+ Param{0, 11, 10},
+ Param{1, 10, 10},
+ Param{0, (1 << 8) - 1, 2},
+ Param{0, (1 << 8), 2},
+ Param{0, (1 << 30) - 1, 2},
+ Param{-1000, 1000, 10},
+ Param{0, Limits::max(), 2},
+ Param{0, Limits::max(), 3},
+ Param{0, Limits::max(), 10},
+ Param{Limits::min(), 0},
+ Param{Limits::min(), Limits::max(), 2},
+ };
+}
+
+std::string ParamName(
+ const ::testing::TestParamInfo<log_uniform_i32::param_type>& info) {
+ const auto& p = info.param;
+ std::string name =
+ absl::StrCat("min_", p.min(), "__max_", p.max(), "__base_", p.base());
+ return absl::StrReplaceAll(name, {{"+", "_"}, {"-", "_"}, {".", "_"}});
+}
+
+INSTANTIATE_TEST_SUITE_P(All, LogUniformIntChiSquaredTest,
+ ::testing::ValuesIn(GenParams()), ParamName);
+
+// NOTE: absl::log_uniform_int_distribution is not guaranteed to be stable.
+TEST(LogUniformIntDistributionTest, StabilityTest) {
+ using testing::ElementsAre;
+ // absl::uniform_int_distribution stability relies on
+ // absl::random_internal::LeadingSetBit, std::log, std::pow.
+ absl::random_internal::sequence_urbg urbg(
+ {0x0003eb76f6f7f755ull, 0xFFCEA50FDB2F953Bull, 0xC332DDEFBE6C5AA5ull,
+ 0x6558218568AB9702ull, 0x2AEF7DAD5B6E2F84ull, 0x1521B62829076170ull,
+ 0xECDD4775619F1510ull, 0x13CCA830EB61BD96ull, 0x0334FE1EAA0363CFull,
+ 0xB5735C904C70A239ull, 0xD59E9E0BCBAADE14ull, 0xEECC86BC60622CA7ull});
+
+ std::vector<int> output(6);
+
+ {
+ absl::log_uniform_int_distribution<int32_t> dist(0, 256);
+ std::generate(std::begin(output), std::end(output),
+ [&] { return dist(urbg); });
+ EXPECT_THAT(output, ElementsAre(256, 66, 4, 6, 57, 103));
+ }
+ urbg.reset();
+ {
+ absl::log_uniform_int_distribution<int32_t> dist(0, 256, 10);
+ std::generate(std::begin(output), std::end(output),
+ [&] { return dist(urbg); });
+ EXPECT_THAT(output, ElementsAre(8, 4, 0, 0, 0, 69));
+ }
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/random/mock_distributions.h b/third_party/abseil/src/absl/random/mock_distributions.h
new file mode 100644
index 0000000..764ab37
--- /dev/null
+++ b/third_party/abseil/src/absl/random/mock_distributions.h
@@ -0,0 +1,266 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: mock_distributions.h
+// -----------------------------------------------------------------------------
+//
+// This file contains mock distribution functions for use alongside an
+// `absl::MockingBitGen` object within the Googletest testing framework. Such
+// mocks are useful to provide deterministic values as return values within
+// (otherwise random) Abseil distribution functions.
+//
+// The return type of each function is a mock expectation object which
+// is used to set the match result.
+//
+// More information about the Googletest testing framework is available at
+// https://github.com/google/googletest
+//
+// EXPECT_CALL and ON_CALL need to be made within the same DLL component as
+// the call to absl::Uniform and related methods, otherwise mocking will fail
+// since the underlying implementation creates a type-specific pointer which
+// will be distinct across different DLL boundaries.
+//
+// Example:
+//
+// absl::MockingBitGen mock;
+// EXPECT_CALL(absl::MockUniform<int>(), Call(mock, 1, 1000))
+// .WillRepeatedly(testing::ReturnRoundRobin({20, 40}));
+//
+// EXPECT_EQ(absl::Uniform<int>(gen, 1, 1000), 20);
+// EXPECT_EQ(absl::Uniform<int>(gen, 1, 1000), 40);
+// EXPECT_EQ(absl::Uniform<int>(gen, 1, 1000), 20);
+// EXPECT_EQ(absl::Uniform<int>(gen, 1, 1000), 40);
+
+#ifndef ABSL_RANDOM_MOCK_DISTRIBUTIONS_H_
+#define ABSL_RANDOM_MOCK_DISTRIBUTIONS_H_
+
+#include <limits>
+#include <type_traits>
+#include <utility>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/meta/type_traits.h"
+#include "absl/random/distributions.h"
+#include "absl/random/internal/mock_overload_set.h"
+#include "absl/random/mocking_bit_gen.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+// -----------------------------------------------------------------------------
+// absl::MockUniform
+// -----------------------------------------------------------------------------
+//
+// Matches calls to absl::Uniform.
+//
+// `absl::MockUniform` is a class template used in conjunction with Googletest's
+// `ON_CALL()` and `EXPECT_CALL()` macros. To use it, default-construct an
+// instance of it inside `ON_CALL()` or `EXPECT_CALL()`, and use `Call(...)` the
+// same way one would define mocks on a Googletest `MockFunction()`.
+//
+// Example:
+//
+// absl::MockingBitGen mock;
+// EXPECT_CALL(absl::MockUniform<uint32_t>(), Call(mock))
+// .WillOnce(Return(123456));
+// auto x = absl::Uniform<uint32_t>(mock);
+// assert(x == 123456)
+//
+template <typename R>
+using MockUniform = random_internal::MockOverloadSet<
+ random_internal::UniformDistributionWrapper<R>,
+ R(IntervalClosedOpenTag, MockingBitGen&, R, R),
+ R(IntervalClosedClosedTag, MockingBitGen&, R, R),
+ R(IntervalOpenOpenTag, MockingBitGen&, R, R),
+ R(IntervalOpenClosedTag, MockingBitGen&, R, R), R(MockingBitGen&, R, R),
+ R(MockingBitGen&)>;
+
+// -----------------------------------------------------------------------------
+// absl::MockBernoulli
+// -----------------------------------------------------------------------------
+//
+// Matches calls to absl::Bernoulli.
+//
+// `absl::MockBernoulli` is a class used in conjunction with Googletest's
+// `ON_CALL()` and `EXPECT_CALL()` macros. To use it, default-construct an
+// instance of it inside `ON_CALL()` or `EXPECT_CALL()`, and use `Call(...)` the
+// same way one would define mocks on a Googletest `MockFunction()`.
+//
+// Example:
+//
+// absl::MockingBitGen mock;
+// EXPECT_CALL(absl::MockBernoulli(), Call(mock, testing::_))
+// .WillOnce(Return(false));
+// assert(absl::Bernoulli(mock, 0.5) == false);
+//
+using MockBernoulli =
+ random_internal::MockOverloadSet<absl::bernoulli_distribution,
+ bool(MockingBitGen&, double)>;
+
+// -----------------------------------------------------------------------------
+// absl::MockBeta
+// -----------------------------------------------------------------------------
+//
+// Matches calls to absl::Beta.
+//
+// `absl::MockBeta` is a class used in conjunction with Googletest's `ON_CALL()`
+// and `EXPECT_CALL()` macros. To use it, default-construct an instance of it
+// inside `ON_CALL()` or `EXPECT_CALL()`, and use `Call(...)` the same way one
+// would define mocks on a Googletest `MockFunction()`.
+//
+// Example:
+//
+// absl::MockingBitGen mock;
+// EXPECT_CALL(absl::MockBeta(), Call(mock, 3.0, 2.0))
+// .WillOnce(Return(0.567));
+// auto x = absl::Beta<double>(mock, 3.0, 2.0);
+// assert(x == 0.567);
+//
+template <typename RealType>
+using MockBeta =
+ random_internal::MockOverloadSet<absl::beta_distribution<RealType>,
+ RealType(MockingBitGen&, RealType,
+ RealType)>;
+
+// -----------------------------------------------------------------------------
+// absl::MockExponential
+// -----------------------------------------------------------------------------
+//
+// Matches calls to absl::Exponential.
+//
+// `absl::MockExponential` is a class template used in conjunction with
+// Googletest's `ON_CALL()` and `EXPECT_CALL()` macros. To use it,
+// default-construct an instance of it inside `ON_CALL()` or `EXPECT_CALL()`,
+// and use `Call(...)` the same way one would define mocks on a
+// Googletest `MockFunction()`.
+//
+// Example:
+//
+// absl::MockingBitGen mock;
+// EXPECT_CALL(absl::MockExponential<double>(), Call(mock, 0.5))
+// .WillOnce(Return(12.3456789));
+// auto x = absl::Exponential<double>(mock, 0.5);
+// assert(x == 12.3456789)
+//
+template <typename RealType>
+using MockExponential =
+ random_internal::MockOverloadSet<absl::exponential_distribution<RealType>,
+ RealType(MockingBitGen&, RealType)>;
+
+// -----------------------------------------------------------------------------
+// absl::MockGaussian
+// -----------------------------------------------------------------------------
+//
+// Matches calls to absl::Gaussian.
+//
+// `absl::MockGaussian` is a class template used in conjunction with
+// Googletest's `ON_CALL()` and `EXPECT_CALL()` macros. To use it,
+// default-construct an instance of it inside `ON_CALL()` or `EXPECT_CALL()`,
+// and use `Call(...)` the same way one would define mocks on a
+// Googletest `MockFunction()`.
+//
+// Example:
+//
+// absl::MockingBitGen mock;
+// EXPECT_CALL(absl::MockGaussian<double>(), Call(mock, 16.3, 3.3))
+// .WillOnce(Return(12.3456789));
+// auto x = absl::Gaussian<double>(mock, 16.3, 3.3);
+// assert(x == 12.3456789)
+//
+template <typename RealType>
+using MockGaussian =
+ random_internal::MockOverloadSet<absl::gaussian_distribution<RealType>,
+ RealType(MockingBitGen&, RealType,
+ RealType)>;
+
+// -----------------------------------------------------------------------------
+// absl::MockLogUniform
+// -----------------------------------------------------------------------------
+//
+// Matches calls to absl::LogUniform.
+//
+// `absl::MockLogUniform` is a class template used in conjunction with
+// Googletest's `ON_CALL()` and `EXPECT_CALL()` macros. To use it,
+// default-construct an instance of it inside `ON_CALL()` or `EXPECT_CALL()`,
+// and use `Call(...)` the same way one would define mocks on a
+// Googletest `MockFunction()`.
+//
+// Example:
+//
+// absl::MockingBitGen mock;
+// EXPECT_CALL(absl::MockLogUniform<int>(), Call(mock, 10, 10000, 10))
+// .WillOnce(Return(1221));
+// auto x = absl::LogUniform<int>(mock, 10, 10000, 10);
+// assert(x == 1221)
+//
+template <typename IntType>
+using MockLogUniform = random_internal::MockOverloadSet<
+ absl::log_uniform_int_distribution<IntType>,
+ IntType(MockingBitGen&, IntType, IntType, IntType)>;
+
+// -----------------------------------------------------------------------------
+// absl::MockPoisson
+// -----------------------------------------------------------------------------
+//
+// Matches calls to absl::Poisson.
+//
+// `absl::MockPoisson` is a class template used in conjunction with Googletest's
+// `ON_CALL()` and `EXPECT_CALL()` macros. To use it, default-construct an
+// instance of it inside `ON_CALL()` or `EXPECT_CALL()`, and use `Call(...)` the
+// same way one would define mocks on a Googletest `MockFunction()`.
+//
+// Example:
+//
+// absl::MockingBitGen mock;
+// EXPECT_CALL(absl::MockPoisson<int>(), Call(mock, 2.0))
+// .WillOnce(Return(1221));
+// auto x = absl::Poisson<int>(mock, 2.0);
+// assert(x == 1221)
+//
+template <typename IntType>
+using MockPoisson =
+ random_internal::MockOverloadSet<absl::poisson_distribution<IntType>,
+ IntType(MockingBitGen&, double)>;
+
+// -----------------------------------------------------------------------------
+// absl::MockZipf
+// -----------------------------------------------------------------------------
+//
+// Matches calls to absl::Zipf.
+//
+// `absl::MockZipf` is a class template used in conjunction with Googletest's
+// `ON_CALL()` and `EXPECT_CALL()` macros. To use it, default-construct an
+// instance of it inside `ON_CALL()` or `EXPECT_CALL()`, and use `Call(...)` the
+// same way one would define mocks on a Googletest `MockFunction()`.
+//
+// Example:
+//
+// absl::MockingBitGen mock;
+// EXPECT_CALL(absl::MockZipf<int>(), Call(mock, 1000000, 2.0, 1.0))
+// .WillOnce(Return(1221));
+// auto x = absl::Zipf<int>(mock, 1000000, 2.0, 1.0);
+// assert(x == 1221)
+//
+template <typename IntType>
+using MockZipf =
+ random_internal::MockOverloadSet<absl::zipf_distribution<IntType>,
+ IntType(MockingBitGen&, IntType, double,
+ double)>;
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_RANDOM_MOCK_DISTRIBUTIONS_H_
diff --git a/third_party/abseil/src/absl/random/mock_distributions_test.cc b/third_party/abseil/src/absl/random/mock_distributions_test.cc
new file mode 100644
index 0000000..de23baf
--- /dev/null
+++ b/third_party/abseil/src/absl/random/mock_distributions_test.cc
@@ -0,0 +1,72 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/random/mock_distributions.h"
+
+#include "gtest/gtest.h"
+#include "absl/random/mocking_bit_gen.h"
+#include "absl/random/random.h"
+
+namespace {
+using ::testing::Return;
+
+TEST(MockDistributions, Examples) {
+ absl::MockingBitGen gen;
+
+ EXPECT_NE(absl::Uniform<int>(gen, 1, 1000000), 20);
+ EXPECT_CALL(absl::MockUniform<int>(), Call(gen, 1, 1000000))
+ .WillOnce(Return(20));
+ EXPECT_EQ(absl::Uniform<int>(gen, 1, 1000000), 20);
+
+ EXPECT_NE(absl::Uniform<double>(gen, 0.0, 100.0), 5.0);
+ EXPECT_CALL(absl::MockUniform<double>(), Call(gen, 0.0, 100.0))
+ .WillOnce(Return(5.0));
+ EXPECT_EQ(absl::Uniform<double>(gen, 0.0, 100.0), 5.0);
+
+ EXPECT_NE(absl::Exponential<double>(gen, 1.0), 42);
+ EXPECT_CALL(absl::MockExponential<double>(), Call(gen, 1.0))
+ .WillOnce(Return(42));
+ EXPECT_EQ(absl::Exponential<double>(gen, 1.0), 42);
+
+ EXPECT_NE(absl::Poisson<int>(gen, 1.0), 500);
+ EXPECT_CALL(absl::MockPoisson<int>(), Call(gen, 1.0)).WillOnce(Return(500));
+ EXPECT_EQ(absl::Poisson<int>(gen, 1.0), 500);
+
+ EXPECT_NE(absl::Bernoulli(gen, 0.000001), true);
+ EXPECT_CALL(absl::MockBernoulli(), Call(gen, 0.000001))
+ .WillOnce(Return(true));
+ EXPECT_EQ(absl::Bernoulli(gen, 0.000001), true);
+
+ EXPECT_NE(absl::Beta<double>(gen, 3.0, 2.0), 0.567);
+ EXPECT_CALL(absl::MockBeta<double>(), Call(gen, 3.0, 2.0))
+ .WillOnce(Return(0.567));
+ EXPECT_EQ(absl::Beta<double>(gen, 3.0, 2.0), 0.567);
+
+ EXPECT_NE(absl::Zipf<int>(gen, 1000000, 2.0, 1.0), 1221);
+ EXPECT_CALL(absl::MockZipf<int>(), Call(gen, 1000000, 2.0, 1.0))
+ .WillOnce(Return(1221));
+ EXPECT_EQ(absl::Zipf<int>(gen, 1000000, 2.0, 1.0), 1221);
+
+ EXPECT_NE(absl::Gaussian<double>(gen, 0.0, 1.0), 0.001);
+ EXPECT_CALL(absl::MockGaussian<double>(), Call(gen, 0.0, 1.0))
+ .WillOnce(Return(0.001));
+ EXPECT_EQ(absl::Gaussian<double>(gen, 0.0, 1.0), 0.001);
+
+ EXPECT_NE(absl::LogUniform<int>(gen, 0, 1000000, 2), 2040);
+ EXPECT_CALL(absl::MockLogUniform<int>(), Call(gen, 0, 1000000, 2))
+ .WillOnce(Return(2040));
+ EXPECT_EQ(absl::LogUniform<int>(gen, 0, 1000000, 2), 2040);
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/random/mocking_bit_gen.h b/third_party/abseil/src/absl/random/mocking_bit_gen.h
new file mode 100644
index 0000000..6d2f2c8
--- /dev/null
+++ b/third_party/abseil/src/absl/random/mocking_bit_gen.h
@@ -0,0 +1,228 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// mocking_bit_gen.h
+// -----------------------------------------------------------------------------
+//
+// This file includes an `absl::MockingBitGen` class to use as a mock within the
+// Googletest testing framework. Such a mock is useful to provide deterministic
+// values as return values within (otherwise random) Abseil distribution
+// functions. Such determinism within a mock is useful within testing frameworks
+// to test otherwise indeterminate APIs.
+//
+// More information about the Googletest testing framework is available at
+// https://github.com/google/googletest
+
+#ifndef ABSL_RANDOM_MOCKING_BIT_GEN_H_
+#define ABSL_RANDOM_MOCKING_BIT_GEN_H_
+
+#include <iterator>
+#include <limits>
+#include <memory>
+#include <tuple>
+#include <type_traits>
+#include <utility>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/base/internal/fast_type_id.h"
+#include "absl/container/flat_hash_map.h"
+#include "absl/meta/type_traits.h"
+#include "absl/random/distributions.h"
+#include "absl/random/internal/distribution_caller.h"
+#include "absl/random/random.h"
+#include "absl/strings/str_cat.h"
+#include "absl/strings/str_join.h"
+#include "absl/types/span.h"
+#include "absl/types/variant.h"
+#include "absl/utility/utility.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+namespace random_internal {
+template <typename>
+struct DistributionCaller;
+class MockHelpers;
+
+} // namespace random_internal
+class BitGenRef;
+
+// MockingBitGen
+//
+// `absl::MockingBitGen` is a mock Uniform Random Bit Generator (URBG) class
+// which can act in place of an `absl::BitGen` URBG within tests using the
+// Googletest testing framework.
+//
+// Usage:
+//
+// Use an `absl::MockingBitGen` along with a mock distribution object (within
+// mock_distributions.h) inside Googletest constructs such as ON_CALL(),
+// EXPECT_TRUE(), etc. to produce deterministic results conforming to the
+// distribution's API contract.
+//
+// Example:
+//
+// // Mock a call to an `absl::Bernoulli` distribution using Googletest
+// absl::MockingBitGen bitgen;
+//
+// ON_CALL(absl::MockBernoulli(), Call(bitgen, 0.5))
+// .WillByDefault(testing::Return(true));
+// EXPECT_TRUE(absl::Bernoulli(bitgen, 0.5));
+//
+// // Mock a call to an `absl::Uniform` distribution within Googletest
+// absl::MockingBitGen bitgen;
+//
+// ON_CALL(absl::MockUniform<int>(), Call(bitgen, testing::_, testing::_))
+// .WillByDefault([] (int low, int high) {
+// return (low + high) / 2;
+// });
+//
+// EXPECT_EQ(absl::Uniform<int>(gen, 0, 10), 5);
+// EXPECT_EQ(absl::Uniform<int>(gen, 30, 40), 35);
+//
+// At this time, only mock distributions supplied within the Abseil random
+// library are officially supported.
+//
+// EXPECT_CALL and ON_CALL need to be made within the same DLL component as
+// the call to absl::Uniform and related methods, otherwise mocking will fail
+// since the underlying implementation creates a type-specific pointer which
+// will be distinct across different DLL boundaries.
+//
+class MockingBitGen {
+ public:
+ MockingBitGen() = default;
+
+ ~MockingBitGen() {
+ for (const auto& del : deleters_) del();
+ }
+
+ // URBG interface
+ using result_type = absl::BitGen::result_type;
+
+ static constexpr result_type(min)() { return (absl::BitGen::min)(); }
+ static constexpr result_type(max)() { return (absl::BitGen::max)(); }
+ result_type operator()() { return gen_(); }
+
+ private:
+ using match_impl_fn = void (*)(void* mock_fn, void* t_erased_arg_tuple,
+ void* t_erased_result);
+
+ struct MockData {
+ void* mock_fn = nullptr;
+ match_impl_fn match_impl = nullptr;
+ };
+
+ // GetMockFnType returns the testing::MockFunction for a result and tuple.
+ // This method only exists for type deduction and is otherwise unimplemented.
+ template <typename ResultT, typename... Args>
+ static auto GetMockFnType(ResultT, std::tuple<Args...>)
+ -> ::testing::MockFunction<ResultT(Args...)>;
+
+ // MockFnCaller is a helper method for use with absl::apply to
+ // apply an ArgTupleT to a compatible MockFunction.
+ // NOTE: MockFnCaller is essentially equivalent to the lambda:
+ // [fn](auto... args) { return fn->Call(std::move(args)...)}
+ // however that fails to build on some supported platforms.
+ template <typename ResultT, typename MockFnType, typename Tuple>
+ struct MockFnCaller;
+ // specialization for std::tuple.
+ template <typename ResultT, typename MockFnType, typename... Args>
+ struct MockFnCaller<ResultT, MockFnType, std::tuple<Args...>> {
+ MockFnType* fn;
+ inline ResultT operator()(Args... args) {
+ return fn->Call(std::move(args)...);
+ }
+ };
+
+ // MockingBitGen::RegisterMock
+ //
+ // RegisterMock<ResultT, ArgTupleT>(FastTypeIdType) is the main extension
+ // point for extending the MockingBitGen framework. It provides a mechanism to
+ // install a mock expectation for a function like ResultT(Args...) keyed by
+ // type_idex onto the MockingBitGen context. The key is that the type_index
+ // used to register must match the type index used to call the mock.
+ //
+ // The returned MockFunction<...> type can be used to setup additional
+ // distribution parameters of the expectation.
+ template <typename ResultT, typename ArgTupleT>
+ auto RegisterMock(base_internal::FastTypeIdType type)
+ -> decltype(GetMockFnType(std::declval<ResultT>(),
+ std::declval<ArgTupleT>()))& {
+ using MockFnType = decltype(
+ GetMockFnType(std::declval<ResultT>(), std::declval<ArgTupleT>()));
+ auto& mock = mocks_[type];
+ if (!mock.mock_fn) {
+ auto* mock_fn = new MockFnType;
+ mock.mock_fn = mock_fn;
+ mock.match_impl = &MatchImpl<ResultT, ArgTupleT>;
+ deleters_.emplace_back([mock_fn] { delete mock_fn; });
+ }
+ return *static_cast<MockFnType*>(mock.mock_fn);
+ }
+
+ // MockingBitGen::MatchImpl<> is a dispatch function which converts the
+ // generic type-erased parameters into a specific mock invocation call.
+ // Requires tuple_args to point to a ArgTupleT, which is a std::tuple<Args...>
+ // used to invoke the mock function.
+ // Requires result to point to a ResultT, which is the result of the call.
+ template <typename ResultT, typename ArgTupleT>
+ static void MatchImpl(/*MockFnType<ResultT, Args...>*/ void* mock_fn,
+ /*ArgTupleT*/ void* args_tuple,
+ /*ResultT*/ void* result) {
+ using MockFnType = decltype(
+ GetMockFnType(std::declval<ResultT>(), std::declval<ArgTupleT>()));
+ *static_cast<ResultT*>(result) = absl::apply(
+ MockFnCaller<ResultT, MockFnType, ArgTupleT>{
+ static_cast<MockFnType*>(mock_fn)},
+ *static_cast<ArgTupleT*>(args_tuple));
+ }
+
+ // MockingBitGen::InvokeMock
+ //
+ // InvokeMock(FastTypeIdType, args, result) is the entrypoint for invoking
+ // mocks registered on MockingBitGen.
+ //
+ // When no mocks are registered on the provided FastTypeIdType, returns false.
+ // Otherwise attempts to invoke the mock function ResultT(Args...) that
+ // was previously registered via the type_index.
+ // Requires tuple_args to point to a ArgTupleT, which is a std::tuple<Args...>
+ // used to invoke the mock function.
+ // Requires result to point to a ResultT, which is the result of the call.
+ inline bool InvokeMock(base_internal::FastTypeIdType type, void* args_tuple,
+ void* result) {
+ // Trigger a mock, if there exists one that matches `param`.
+ auto it = mocks_.find(type);
+ if (it == mocks_.end()) return false;
+ auto* mock_data = static_cast<MockData*>(&it->second);
+ mock_data->match_impl(mock_data->mock_fn, args_tuple, result);
+ return true;
+ }
+
+ absl::flat_hash_map<base_internal::FastTypeIdType, MockData> mocks_;
+ std::vector<std::function<void()>> deleters_;
+ absl::BitGen gen_;
+
+ template <typename>
+ friend struct ::absl::random_internal::DistributionCaller; // for InvokeMock
+ friend class ::absl::BitGenRef; // for InvokeMock
+ friend class ::absl::random_internal::MockHelpers; // for RegisterMock,
+ // InvokeMock
+};
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_RANDOM_MOCKING_BIT_GEN_H_
diff --git a/third_party/abseil/src/absl/random/mocking_bit_gen_test.cc b/third_party/abseil/src/absl/random/mocking_bit_gen_test.cc
new file mode 100644
index 0000000..f0ffc9a
--- /dev/null
+++ b/third_party/abseil/src/absl/random/mocking_bit_gen_test.cc
@@ -0,0 +1,347 @@
+//
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+#include "absl/random/mocking_bit_gen.h"
+
+#include <numeric>
+#include <random>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest-spi.h"
+#include "gtest/gtest.h"
+#include "absl/random/bit_gen_ref.h"
+#include "absl/random/mock_distributions.h"
+#include "absl/random/random.h"
+
+namespace {
+using ::testing::Ne;
+using ::testing::Return;
+
+TEST(BasicMocking, AllDistributionsAreOverridable) {
+ absl::MockingBitGen gen;
+
+ EXPECT_NE(absl::Uniform<int>(gen, 1, 1000000), 20);
+ EXPECT_CALL(absl::MockUniform<int>(), Call(gen, 1, 1000000))
+ .WillOnce(Return(20));
+ EXPECT_EQ(absl::Uniform<int>(gen, 1, 1000000), 20);
+
+ EXPECT_NE(absl::Uniform<double>(gen, 0.0, 100.0), 5.0);
+ EXPECT_CALL(absl::MockUniform<double>(), Call(gen, 0.0, 100.0))
+ .WillOnce(Return(5.0));
+ EXPECT_EQ(absl::Uniform<double>(gen, 0.0, 100.0), 5.0);
+
+ EXPECT_NE(absl::Exponential<double>(gen, 1.0), 42);
+ EXPECT_CALL(absl::MockExponential<double>(), Call(gen, 1.0))
+ .WillOnce(Return(42));
+ EXPECT_EQ(absl::Exponential<double>(gen, 1.0), 42);
+
+ EXPECT_NE(absl::Poisson<int>(gen, 1.0), 500);
+ EXPECT_CALL(absl::MockPoisson<int>(), Call(gen, 1.0)).WillOnce(Return(500));
+ EXPECT_EQ(absl::Poisson<int>(gen, 1.0), 500);
+
+ EXPECT_NE(absl::Bernoulli(gen, 0.000001), true);
+ EXPECT_CALL(absl::MockBernoulli(), Call(gen, 0.000001))
+ .WillOnce(Return(true));
+ EXPECT_EQ(absl::Bernoulli(gen, 0.000001), true);
+
+ EXPECT_NE(absl::Zipf<int>(gen, 1000000, 2.0, 1.0), 1221);
+ EXPECT_CALL(absl::MockZipf<int>(), Call(gen, 1000000, 2.0, 1.0))
+ .WillOnce(Return(1221));
+ EXPECT_EQ(absl::Zipf<int>(gen, 1000000, 2.0, 1.0), 1221);
+
+ EXPECT_NE(absl::Gaussian<double>(gen, 0.0, 1.0), 0.001);
+ EXPECT_CALL(absl::MockGaussian<double>(), Call(gen, 0.0, 1.0))
+ .WillOnce(Return(0.001));
+ EXPECT_EQ(absl::Gaussian<double>(gen, 0.0, 1.0), 0.001);
+
+ EXPECT_NE(absl::LogUniform<int>(gen, 0, 1000000, 2), 500000);
+ EXPECT_CALL(absl::MockLogUniform<int>(), Call(gen, 0, 1000000, 2))
+ .WillOnce(Return(500000));
+ EXPECT_EQ(absl::LogUniform<int>(gen, 0, 1000000, 2), 500000);
+}
+
+TEST(BasicMocking, OnDistribution) {
+ absl::MockingBitGen gen;
+
+ EXPECT_NE(absl::Uniform<int>(gen, 1, 1000000), 20);
+ ON_CALL(absl::MockUniform<int>(), Call(gen, 1, 1000000))
+ .WillByDefault(Return(20));
+ EXPECT_EQ(absl::Uniform<int>(gen, 1, 1000000), 20);
+
+ EXPECT_NE(absl::Uniform<double>(gen, 0.0, 100.0), 5.0);
+ ON_CALL(absl::MockUniform<double>(), Call(gen, 0.0, 100.0))
+ .WillByDefault(Return(5.0));
+ EXPECT_EQ(absl::Uniform<double>(gen, 0.0, 100.0), 5.0);
+
+ EXPECT_NE(absl::Exponential<double>(gen, 1.0), 42);
+ ON_CALL(absl::MockExponential<double>(), Call(gen, 1.0))
+ .WillByDefault(Return(42));
+ EXPECT_EQ(absl::Exponential<double>(gen, 1.0), 42);
+
+ EXPECT_NE(absl::Poisson<int>(gen, 1.0), 500);
+ ON_CALL(absl::MockPoisson<int>(), Call(gen, 1.0)).WillByDefault(Return(500));
+ EXPECT_EQ(absl::Poisson<int>(gen, 1.0), 500);
+
+ EXPECT_NE(absl::Bernoulli(gen, 0.000001), true);
+ ON_CALL(absl::MockBernoulli(), Call(gen, 0.000001))
+ .WillByDefault(Return(true));
+ EXPECT_EQ(absl::Bernoulli(gen, 0.000001), true);
+
+ EXPECT_NE(absl::Zipf<int>(gen, 1000000, 2.0, 1.0), 1221);
+ ON_CALL(absl::MockZipf<int>(), Call(gen, 1000000, 2.0, 1.0))
+ .WillByDefault(Return(1221));
+ EXPECT_EQ(absl::Zipf<int>(gen, 1000000, 2.0, 1.0), 1221);
+
+ EXPECT_NE(absl::Gaussian<double>(gen, 0.0, 1.0), 0.001);
+ ON_CALL(absl::MockGaussian<double>(), Call(gen, 0.0, 1.0))
+ .WillByDefault(Return(0.001));
+ EXPECT_EQ(absl::Gaussian<double>(gen, 0.0, 1.0), 0.001);
+
+ EXPECT_NE(absl::LogUniform<int>(gen, 0, 1000000, 2), 2040);
+ ON_CALL(absl::MockLogUniform<int>(), Call(gen, 0, 1000000, 2))
+ .WillByDefault(Return(2040));
+ EXPECT_EQ(absl::LogUniform<int>(gen, 0, 1000000, 2), 2040);
+}
+
+TEST(BasicMocking, GMockMatchers) {
+ absl::MockingBitGen gen;
+
+ EXPECT_NE(absl::Zipf<int>(gen, 1000000, 2.0, 1.0), 1221);
+ ON_CALL(absl::MockZipf<int>(), Call(gen, 1000000, 2.0, 1.0))
+ .WillByDefault(Return(1221));
+ EXPECT_EQ(absl::Zipf<int>(gen, 1000000, 2.0, 1.0), 1221);
+}
+
+TEST(BasicMocking, OverridesWithMultipleGMockExpectations) {
+ absl::MockingBitGen gen;
+
+ EXPECT_CALL(absl::MockUniform<int>(), Call(gen, 1, 10000))
+ .WillOnce(Return(20))
+ .WillOnce(Return(40))
+ .WillOnce(Return(60));
+ EXPECT_EQ(absl::Uniform(gen, 1, 10000), 20);
+ EXPECT_EQ(absl::Uniform(gen, 1, 10000), 40);
+ EXPECT_EQ(absl::Uniform(gen, 1, 10000), 60);
+}
+
+TEST(BasicMocking, DefaultArgument) {
+ absl::MockingBitGen gen;
+
+ ON_CALL(absl::MockExponential<double>(), Call(gen, 1.0))
+ .WillByDefault(Return(200));
+
+ EXPECT_EQ(absl::Exponential<double>(gen), 200);
+ EXPECT_EQ(absl::Exponential<double>(gen, 1.0), 200);
+}
+
+TEST(BasicMocking, MultipleGenerators) {
+ auto get_value = [](absl::BitGenRef gen_ref) {
+ return absl::Uniform(gen_ref, 1, 1000000);
+ };
+ absl::MockingBitGen unmocked_generator;
+ absl::MockingBitGen mocked_with_3;
+ absl::MockingBitGen mocked_with_11;
+
+ EXPECT_CALL(absl::MockUniform<int>(), Call(mocked_with_3, 1, 1000000))
+ .WillOnce(Return(3))
+ .WillRepeatedly(Return(17));
+ EXPECT_CALL(absl::MockUniform<int>(), Call(mocked_with_11, 1, 1000000))
+ .WillOnce(Return(11))
+ .WillRepeatedly(Return(17));
+
+ // Ensure that unmocked generator generates neither value.
+ int unmocked_value = get_value(unmocked_generator);
+ EXPECT_NE(unmocked_value, 3);
+ EXPECT_NE(unmocked_value, 11);
+ // Mocked generators should generate their mocked values.
+ EXPECT_EQ(get_value(mocked_with_3), 3);
+ EXPECT_EQ(get_value(mocked_with_11), 11);
+ // Ensure that the mocks have expired.
+ EXPECT_NE(get_value(mocked_with_3), 3);
+ EXPECT_NE(get_value(mocked_with_11), 11);
+}
+
+TEST(BasicMocking, MocksNotTrigeredForIncorrectTypes) {
+ absl::MockingBitGen gen;
+ EXPECT_CALL(absl::MockUniform<uint32_t>(), Call(gen)).WillOnce(Return(42));
+
+ EXPECT_NE(absl::Uniform<uint16_t>(gen), 42); // Not mocked
+ EXPECT_EQ(absl::Uniform<uint32_t>(gen), 42); // Mock triggered
+}
+
+TEST(BasicMocking, FailsOnUnsatisfiedMocks) {
+ EXPECT_NONFATAL_FAILURE(
+ []() {
+ absl::MockingBitGen gen;
+ EXPECT_CALL(absl::MockExponential<double>(), Call(gen, 1.0))
+ .WillOnce(Return(3.0));
+ // Does not call absl::Exponential().
+ }(),
+ "unsatisfied and active");
+}
+
+TEST(OnUniform, RespectsUniformIntervalSemantics) {
+ absl::MockingBitGen gen;
+
+ EXPECT_CALL(absl::MockUniform<int>(),
+ Call(absl::IntervalClosed, gen, 1, 1000000))
+ .WillOnce(Return(301));
+ EXPECT_NE(absl::Uniform(gen, 1, 1000000), 301); // Not mocked
+ EXPECT_EQ(absl::Uniform(absl::IntervalClosed, gen, 1, 1000000), 301);
+}
+
+TEST(OnUniform, RespectsNoArgUnsignedShorthand) {
+ absl::MockingBitGen gen;
+ EXPECT_CALL(absl::MockUniform<uint32_t>(), Call(gen)).WillOnce(Return(42));
+ EXPECT_EQ(absl::Uniform<uint32_t>(gen), 42);
+}
+
+TEST(RepeatedlyModifier, ForceSnakeEyesForManyDice) {
+ auto roll_some_dice = [](absl::BitGenRef gen_ref) {
+ std::vector<int> results(16);
+ for (auto& r : results) {
+ r = absl::Uniform(absl::IntervalClosed, gen_ref, 1, 6);
+ }
+ return results;
+ };
+ std::vector<int> results;
+ absl::MockingBitGen gen;
+
+ // Without any mocked calls, not all dice roll a "6".
+ results = roll_some_dice(gen);
+ EXPECT_LT(std::accumulate(std::begin(results), std::end(results), 0),
+ results.size() * 6);
+
+ // Verify that we can force all "6"-rolls, with mocking.
+ ON_CALL(absl::MockUniform<int>(), Call(absl::IntervalClosed, gen, 1, 6))
+ .WillByDefault(Return(6));
+ results = roll_some_dice(gen);
+ EXPECT_EQ(std::accumulate(std::begin(results), std::end(results), 0),
+ results.size() * 6);
+}
+
+TEST(WillOnce, DistinctCounters) {
+ absl::MockingBitGen gen;
+ EXPECT_CALL(absl::MockUniform<int>(), Call(gen, 1, 1000000))
+ .Times(3)
+ .WillRepeatedly(Return(0));
+ EXPECT_CALL(absl::MockUniform<int>(), Call(gen, 1000001, 2000000))
+ .Times(3)
+ .WillRepeatedly(Return(1));
+ EXPECT_EQ(absl::Uniform(gen, 1000001, 2000000), 1);
+ EXPECT_EQ(absl::Uniform(gen, 1, 1000000), 0);
+ EXPECT_EQ(absl::Uniform(gen, 1000001, 2000000), 1);
+ EXPECT_EQ(absl::Uniform(gen, 1, 1000000), 0);
+ EXPECT_EQ(absl::Uniform(gen, 1000001, 2000000), 1);
+ EXPECT_EQ(absl::Uniform(gen, 1, 1000000), 0);
+}
+
+TEST(TimesModifier, ModifierSaturatesAndExpires) {
+ EXPECT_NONFATAL_FAILURE(
+ []() {
+ absl::MockingBitGen gen;
+ EXPECT_CALL(absl::MockUniform<int>(), Call(gen, 1, 1000000))
+ .Times(3)
+ .WillRepeatedly(Return(15))
+ .RetiresOnSaturation();
+
+ EXPECT_EQ(absl::Uniform(gen, 1, 1000000), 15);
+ EXPECT_EQ(absl::Uniform(gen, 1, 1000000), 15);
+ EXPECT_EQ(absl::Uniform(gen, 1, 1000000), 15);
+ // Times(3) has expired - Should get a different value now.
+
+ EXPECT_NE(absl::Uniform(gen, 1, 1000000), 15);
+ }(),
+ "");
+}
+
+TEST(TimesModifier, Times0) {
+ absl::MockingBitGen gen;
+ EXPECT_CALL(absl::MockBernoulli(), Call(gen, 0.0)).Times(0);
+ EXPECT_CALL(absl::MockPoisson<int>(), Call(gen, 1.0)).Times(0);
+}
+
+TEST(AnythingMatcher, MatchesAnyArgument) {
+ using testing::_;
+
+ {
+ absl::MockingBitGen gen;
+ ON_CALL(absl::MockUniform<int>(), Call(absl::IntervalClosed, gen, _, 1000))
+ .WillByDefault(Return(11));
+ ON_CALL(absl::MockUniform<int>(),
+ Call(absl::IntervalClosed, gen, _, Ne(1000)))
+ .WillByDefault(Return(99));
+
+ EXPECT_EQ(absl::Uniform(absl::IntervalClosed, gen, 10, 1000000), 99);
+ EXPECT_EQ(absl::Uniform(absl::IntervalClosed, gen, 10, 1000), 11);
+ }
+
+ {
+ absl::MockingBitGen gen;
+ ON_CALL(absl::MockUniform<int>(), Call(gen, 1, _))
+ .WillByDefault(Return(25));
+ ON_CALL(absl::MockUniform<int>(), Call(gen, Ne(1), _))
+ .WillByDefault(Return(99));
+ EXPECT_EQ(absl::Uniform(gen, 3, 1000000), 99);
+ EXPECT_EQ(absl::Uniform(gen, 1, 1000000), 25);
+ }
+
+ {
+ absl::MockingBitGen gen;
+ ON_CALL(absl::MockUniform<int>(), Call(gen, _, _))
+ .WillByDefault(Return(145));
+ EXPECT_EQ(absl::Uniform(gen, 1, 1000), 145);
+ EXPECT_EQ(absl::Uniform(gen, 10, 1000), 145);
+ EXPECT_EQ(absl::Uniform(gen, 100, 1000), 145);
+ }
+}
+
+TEST(AnythingMatcher, WithWillByDefault) {
+ using testing::_;
+ absl::MockingBitGen gen;
+ std::vector<int> values = {11, 22, 33, 44, 55, 66, 77, 88, 99, 1010};
+
+ ON_CALL(absl::MockUniform<size_t>(), Call(gen, 0, _))
+ .WillByDefault(Return(0));
+ for (int i = 0; i < 100; i++) {
+ auto& elem = values[absl::Uniform(gen, 0u, values.size())];
+ EXPECT_EQ(elem, 11);
+ }
+}
+
+TEST(BasicMocking, WillByDefaultWithArgs) {
+ using testing::_;
+
+ absl::MockingBitGen gen;
+ ON_CALL(absl::MockPoisson<int>(), Call(gen, _))
+ .WillByDefault(
+ [](double lambda) { return static_cast<int>(lambda * 10); });
+ EXPECT_EQ(absl::Poisson<int>(gen, 1.7), 17);
+ EXPECT_EQ(absl::Poisson<int>(gen, 0.03), 0);
+}
+
+TEST(MockingBitGen, InSequenceSucceedsInOrder) {
+ absl::MockingBitGen gen;
+
+ testing::InSequence seq;
+
+ EXPECT_CALL(absl::MockPoisson<int>(), Call(gen, 1.0)).WillOnce(Return(3));
+ EXPECT_CALL(absl::MockPoisson<int>(), Call(gen, 2.0)).WillOnce(Return(4));
+
+ EXPECT_EQ(absl::Poisson<int>(gen, 1.0), 3);
+ EXPECT_EQ(absl::Poisson<int>(gen, 2.0), 4);
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/random/poisson_distribution.h b/third_party/abseil/src/absl/random/poisson_distribution.h
new file mode 100644
index 0000000..cb5f5d5
--- /dev/null
+++ b/third_party/abseil/src/absl/random/poisson_distribution.h
@@ -0,0 +1,258 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_RANDOM_POISSON_DISTRIBUTION_H_
+#define ABSL_RANDOM_POISSON_DISTRIBUTION_H_
+
+#include <cassert>
+#include <cmath>
+#include <istream>
+#include <limits>
+#include <ostream>
+#include <type_traits>
+
+#include "absl/random/internal/fast_uniform_bits.h"
+#include "absl/random/internal/fastmath.h"
+#include "absl/random/internal/generate_real.h"
+#include "absl/random/internal/iostream_state_saver.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+// absl::poisson_distribution:
+// Generates discrete variates conforming to a Poisson distribution.
+// p(n) = (mean^n / n!) exp(-mean)
+//
+// Depending on the parameter, the distribution selects one of the following
+// algorithms:
+// * The standard algorithm, attributed to Knuth, extended using a split method
+// for larger values
+// * The "Ratio of Uniforms as a convenient method for sampling from classical
+// discrete distributions", Stadlober, 1989.
+// http://www.sciencedirect.com/science/article/pii/0377042790903495
+//
+// NOTE: param_type.mean() is a double, which permits values larger than
+// poisson_distribution<IntType>::max(), however this should be avoided and
+// the distribution results are limited to the max() value.
+//
+// The goals of this implementation are to provide good performance while still
+// beig thread-safe: This limits the implementation to not using lgamma provided
+// by <math.h>.
+//
+template <typename IntType = int>
+class poisson_distribution {
+ public:
+ using result_type = IntType;
+
+ class param_type {
+ public:
+ using distribution_type = poisson_distribution;
+ explicit param_type(double mean = 1.0);
+
+ double mean() const { return mean_; }
+
+ friend bool operator==(const param_type& a, const param_type& b) {
+ return a.mean_ == b.mean_;
+ }
+
+ friend bool operator!=(const param_type& a, const param_type& b) {
+ return !(a == b);
+ }
+
+ private:
+ friend class poisson_distribution;
+
+ double mean_;
+ double emu_; // e ^ -mean_
+ double lmu_; // ln(mean_)
+ double s_;
+ double log_k_;
+ int split_;
+
+ static_assert(std::is_integral<IntType>::value,
+ "Class-template absl::poisson_distribution<> must be "
+ "parameterized using an integral type.");
+ };
+
+ poisson_distribution() : poisson_distribution(1.0) {}
+
+ explicit poisson_distribution(double mean) : param_(mean) {}
+
+ explicit poisson_distribution(const param_type& p) : param_(p) {}
+
+ void reset() {}
+
+ // generating functions
+ template <typename URBG>
+ result_type operator()(URBG& g) { // NOLINT(runtime/references)
+ return (*this)(g, param_);
+ }
+
+ template <typename URBG>
+ result_type operator()(URBG& g, // NOLINT(runtime/references)
+ const param_type& p);
+
+ param_type param() const { return param_; }
+ void param(const param_type& p) { param_ = p; }
+
+ result_type(min)() const { return 0; }
+ result_type(max)() const { return (std::numeric_limits<result_type>::max)(); }
+
+ double mean() const { return param_.mean(); }
+
+ friend bool operator==(const poisson_distribution& a,
+ const poisson_distribution& b) {
+ return a.param_ == b.param_;
+ }
+ friend bool operator!=(const poisson_distribution& a,
+ const poisson_distribution& b) {
+ return a.param_ != b.param_;
+ }
+
+ private:
+ param_type param_;
+ random_internal::FastUniformBits<uint64_t> fast_u64_;
+};
+
+// -----------------------------------------------------------------------------
+// Implementation details follow
+// -----------------------------------------------------------------------------
+
+template <typename IntType>
+poisson_distribution<IntType>::param_type::param_type(double mean)
+ : mean_(mean), split_(0) {
+ assert(mean >= 0);
+ assert(mean <= (std::numeric_limits<result_type>::max)());
+ // As a defensive measure, avoid large values of the mean. The rejection
+ // algorithm used does not support very large values well. It my be worth
+ // changing algorithms to better deal with these cases.
+ assert(mean <= 1e10);
+ if (mean_ < 10) {
+ // For small lambda, use the knuth method.
+ split_ = 1;
+ emu_ = std::exp(-mean_);
+ } else if (mean_ <= 50) {
+ // Use split-knuth method.
+ split_ = 1 + static_cast<int>(mean_ / 10.0);
+ emu_ = std::exp(-mean_ / static_cast<double>(split_));
+ } else {
+ // Use ratio of uniforms method.
+ constexpr double k2E = 0.7357588823428846;
+ constexpr double kSA = 0.4494580810294493;
+
+ lmu_ = std::log(mean_);
+ double a = mean_ + 0.5;
+ s_ = kSA + std::sqrt(k2E * a);
+ const double mode = std::ceil(mean_) - 1;
+ log_k_ = lmu_ * mode - absl::random_internal::StirlingLogFactorial(mode);
+ }
+}
+
+template <typename IntType>
+template <typename URBG>
+typename poisson_distribution<IntType>::result_type
+poisson_distribution<IntType>::operator()(
+ URBG& g, // NOLINT(runtime/references)
+ const param_type& p) {
+ using random_internal::GeneratePositiveTag;
+ using random_internal::GenerateRealFromBits;
+ using random_internal::GenerateSignedTag;
+
+ if (p.split_ != 0) {
+ // Use Knuth's algorithm with range splitting to avoid floating-point
+ // errors. Knuth's algorithm is: Ui is a sequence of uniform variates on
+ // (0,1); return the number of variates required for product(Ui) <
+ // exp(-lambda).
+ //
+ // The expected number of variates required for Knuth's method can be
+ // computed as follows:
+ // The expected value of U is 0.5, so solving for 0.5^n < exp(-lambda) gives
+ // the expected number of uniform variates
+ // required for a given lambda, which is:
+ // lambda = [2, 5, 9, 10, 11, 12, 13, 14, 15, 16, 17]
+ // n = [3, 8, 13, 15, 16, 18, 19, 21, 22, 24, 25]
+ //
+ result_type n = 0;
+ for (int split = p.split_; split > 0; --split) {
+ double r = 1.0;
+ do {
+ r *= GenerateRealFromBits<double, GeneratePositiveTag, true>(
+ fast_u64_(g)); // U(-1, 0)
+ ++n;
+ } while (r > p.emu_);
+ --n;
+ }
+ return n;
+ }
+
+ // Use ratio of uniforms method.
+ //
+ // Let u ~ Uniform(0, 1), v ~ Uniform(-1, 1),
+ // a = lambda + 1/2,
+ // s = 1.5 - sqrt(3/e) + sqrt(2(lambda + 1/2)/e),
+ // x = s * v/u + a.
+ // P(floor(x) = k | u^2 < f(floor(x))/k), where
+ // f(m) = lambda^m exp(-lambda)/ m!, for 0 <= m, and f(m) = 0 otherwise,
+ // and k = max(f).
+ const double a = p.mean_ + 0.5;
+ for (;;) {
+ const double u = GenerateRealFromBits<double, GeneratePositiveTag, false>(
+ fast_u64_(g)); // U(0, 1)
+ const double v = GenerateRealFromBits<double, GenerateSignedTag, false>(
+ fast_u64_(g)); // U(-1, 1)
+
+ const double x = std::floor(p.s_ * v / u + a);
+ if (x < 0) continue; // f(negative) = 0
+ const double rhs = x * p.lmu_;
+ // clang-format off
+ double s = (x <= 1.0) ? 0.0
+ : (x == 2.0) ? 0.693147180559945
+ : absl::random_internal::StirlingLogFactorial(x);
+ // clang-format on
+ const double lhs = 2.0 * std::log(u) + p.log_k_ + s;
+ if (lhs < rhs) {
+ return x > (max)() ? (max)()
+ : static_cast<result_type>(x); // f(x)/k >= u^2
+ }
+ }
+}
+
+template <typename CharT, typename Traits, typename IntType>
+std::basic_ostream<CharT, Traits>& operator<<(
+ std::basic_ostream<CharT, Traits>& os, // NOLINT(runtime/references)
+ const poisson_distribution<IntType>& x) {
+ auto saver = random_internal::make_ostream_state_saver(os);
+ os.precision(random_internal::stream_precision_helper<double>::kPrecision);
+ os << x.mean();
+ return os;
+}
+
+template <typename CharT, typename Traits, typename IntType>
+std::basic_istream<CharT, Traits>& operator>>(
+ std::basic_istream<CharT, Traits>& is, // NOLINT(runtime/references)
+ poisson_distribution<IntType>& x) { // NOLINT(runtime/references)
+ using param_type = typename poisson_distribution<IntType>::param_type;
+
+ auto saver = random_internal::make_istream_state_saver(is);
+ double mean = random_internal::read_floating_point<double>(is);
+ if (!is.fail()) {
+ x.param(param_type(mean));
+ }
+ return is;
+}
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_RANDOM_POISSON_DISTRIBUTION_H_
diff --git a/third_party/abseil/src/absl/random/poisson_distribution_test.cc b/third_party/abseil/src/absl/random/poisson_distribution_test.cc
new file mode 100644
index 0000000..8baabd1
--- /dev/null
+++ b/third_party/abseil/src/absl/random/poisson_distribution_test.cc
@@ -0,0 +1,573 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/random/poisson_distribution.h"
+
+#include <algorithm>
+#include <cstddef>
+#include <cstdint>
+#include <iterator>
+#include <random>
+#include <sstream>
+#include <string>
+#include <vector>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/base/internal/raw_logging.h"
+#include "absl/base/macros.h"
+#include "absl/container/flat_hash_map.h"
+#include "absl/random/internal/chi_square.h"
+#include "absl/random/internal/distribution_test_util.h"
+#include "absl/random/internal/pcg_engine.h"
+#include "absl/random/internal/sequence_urbg.h"
+#include "absl/random/random.h"
+#include "absl/strings/str_cat.h"
+#include "absl/strings/str_format.h"
+#include "absl/strings/str_replace.h"
+#include "absl/strings/strip.h"
+
+// Notes about generating poisson variates:
+//
+// It is unlikely that any implementation of std::poisson_distribution
+// will be stable over time and across library implementations. For instance
+// the three different poisson variate generators listed below all differ:
+//
+// https://github.com/ampl/gsl/tree/master/randist/poisson.c
+// * GSL uses a gamma + binomial + knuth method to compute poisson variates.
+//
+// https://github.com/gcc-mirror/gcc/blob/master/libstdc%2B%2B-v3/include/bits/random.tcc
+// * GCC uses the Devroye rejection algorithm, based on
+// Devroye, L. Non-Uniform Random Variates Generation. Springer-Verlag,
+// New York, 1986, Ch. X, Sects. 3.3 & 3.4 (+ Errata!), ~p.511
+// http://www.nrbook.com/devroye/
+//
+// https://github.com/llvm-mirror/libcxx/blob/master/include/random
+// * CLANG uses a different rejection method, which appears to include a
+// normal-distribution approximation and an exponential distribution to
+// compute the threshold, including a similar factorial approximation to this
+// one, but it is unclear where the algorithm comes from, exactly.
+//
+
+namespace {
+
+using absl::random_internal::kChiSquared;
+
+// The PoissonDistributionInterfaceTest provides a basic test that
+// absl::poisson_distribution conforms to the interface and serialization
+// requirements imposed by [rand.req.dist] for the common integer types.
+
+template <typename IntType>
+class PoissonDistributionInterfaceTest : public ::testing::Test {};
+
+using IntTypes = ::testing::Types<int, int8_t, int16_t, int32_t, int64_t,
+ uint8_t, uint16_t, uint32_t, uint64_t>;
+TYPED_TEST_CASE(PoissonDistributionInterfaceTest, IntTypes);
+
+TYPED_TEST(PoissonDistributionInterfaceTest, SerializeTest) {
+ using param_type = typename absl::poisson_distribution<TypeParam>::param_type;
+ const double kMax =
+ std::min(1e10 /* assertion limit */,
+ static_cast<double>(std::numeric_limits<TypeParam>::max()));
+
+ const double kParams[] = {
+ // Cases around 1.
+ 1, //
+ std::nextafter(1.0, 0.0), // 1 - epsilon
+ std::nextafter(1.0, 2.0), // 1 + epsilon
+ // Arbitrary values.
+ 1e-8, 1e-4,
+ 0.0000005, // ~7.2e-7
+ 0.2, // ~0.2x
+ 0.5, // 0.72
+ 2, // ~2.8
+ 20, // 3x ~9.6
+ 100, 1e4, 1e8, 1.5e9, 1e20,
+ // Boundary cases.
+ std::numeric_limits<double>::max(),
+ std::numeric_limits<double>::epsilon(),
+ std::nextafter(std::numeric_limits<double>::min(),
+ 1.0), // min + epsilon
+ std::numeric_limits<double>::min(), // smallest normal
+ std::numeric_limits<double>::denorm_min(), // smallest denorm
+ std::numeric_limits<double>::min() / 2, // denorm
+ std::nextafter(std::numeric_limits<double>::min(),
+ 0.0), // denorm_max
+ };
+
+
+ constexpr int kCount = 1000;
+ absl::InsecureBitGen gen;
+ for (const double m : kParams) {
+ const double mean = std::min(kMax, m);
+ const param_type param(mean);
+
+ // Validate parameters.
+ absl::poisson_distribution<TypeParam> before(mean);
+ EXPECT_EQ(before.mean(), param.mean());
+
+ {
+ absl::poisson_distribution<TypeParam> via_param(param);
+ EXPECT_EQ(via_param, before);
+ EXPECT_EQ(via_param.param(), before.param());
+ }
+
+ // Smoke test.
+ auto sample_min = before.max();
+ auto sample_max = before.min();
+ for (int i = 0; i < kCount; i++) {
+ auto sample = before(gen);
+ EXPECT_GE(sample, before.min());
+ EXPECT_LE(sample, before.max());
+ if (sample > sample_max) sample_max = sample;
+ if (sample < sample_min) sample_min = sample;
+ }
+
+ ABSL_INTERNAL_LOG(INFO, absl::StrCat("Range {", param.mean(), "}: ",
+ +sample_min, ", ", +sample_max));
+
+ // Validate stream serialization.
+ std::stringstream ss;
+ ss << before;
+
+ absl::poisson_distribution<TypeParam> after(3.8);
+
+ EXPECT_NE(before.mean(), after.mean());
+ EXPECT_NE(before.param(), after.param());
+ EXPECT_NE(before, after);
+
+ ss >> after;
+
+ EXPECT_EQ(before.mean(), after.mean()) //
+ << ss.str() << " " //
+ << (ss.good() ? "good " : "") //
+ << (ss.bad() ? "bad " : "") //
+ << (ss.eof() ? "eof " : "") //
+ << (ss.fail() ? "fail " : "");
+ }
+}
+
+// See http://www.itl.nist.gov/div898/handbook/eda/section3/eda366j.htm
+
+class PoissonModel {
+ public:
+ explicit PoissonModel(double mean) : mean_(mean) {}
+
+ double mean() const { return mean_; }
+ double variance() const { return mean_; }
+ double stddev() const { return std::sqrt(variance()); }
+ double skew() const { return 1.0 / mean_; }
+ double kurtosis() const { return 3.0 + 1.0 / mean_; }
+
+ // InitCDF() initializes the CDF for the distribution parameters.
+ void InitCDF();
+
+ // The InverseCDF, or the Percent-point function returns x, P(x) < v.
+ struct CDF {
+ size_t index;
+ double pmf;
+ double cdf;
+ };
+ CDF InverseCDF(double p) {
+ CDF target{0, 0, p};
+ auto it = std::upper_bound(
+ std::begin(cdf_), std::end(cdf_), target,
+ [](const CDF& a, const CDF& b) { return a.cdf < b.cdf; });
+ return *it;
+ }
+
+ void LogCDF() {
+ ABSL_INTERNAL_LOG(INFO, absl::StrCat("CDF (mean = ", mean_, ")"));
+ for (const auto c : cdf_) {
+ ABSL_INTERNAL_LOG(INFO,
+ absl::StrCat(c.index, ": pmf=", c.pmf, " cdf=", c.cdf));
+ }
+ }
+
+ private:
+ const double mean_;
+
+ std::vector<CDF> cdf_;
+};
+
+// The goal is to compute an InverseCDF function, or percent point function for
+// the poisson distribution, and use that to partition our output into equal
+// range buckets. However there is no closed form solution for the inverse cdf
+// for poisson distributions (the closest is the incomplete gamma function).
+// Instead, `InitCDF` iteratively computes the PMF and the CDF. This enables
+// searching for the bucket points.
+void PoissonModel::InitCDF() {
+ if (!cdf_.empty()) {
+ // State already initialized.
+ return;
+ }
+ ABSL_ASSERT(mean_ < 201.0);
+
+ const size_t max_i = 50 * stddev() + mean();
+ const double e_neg_mean = std::exp(-mean());
+ ABSL_ASSERT(e_neg_mean > 0);
+
+ double d = 1;
+ double last_result = e_neg_mean;
+ double cumulative = e_neg_mean;
+ if (e_neg_mean > 1e-10) {
+ cdf_.push_back({0, e_neg_mean, cumulative});
+ }
+ for (size_t i = 1; i < max_i; i++) {
+ d *= (mean() / i);
+ double result = e_neg_mean * d;
+ cumulative += result;
+ if (result < 1e-10 && result < last_result && cumulative > 0.999999) {
+ break;
+ }
+ if (result > 1e-7) {
+ cdf_.push_back({i, result, cumulative});
+ }
+ last_result = result;
+ }
+ ABSL_ASSERT(!cdf_.empty());
+}
+
+// PoissonDistributionZTest implements a z-test for the poisson distribution.
+
+struct ZParam {
+ double mean;
+ double p_fail; // Z-Test probability of failure.
+ int trials; // Z-Test trials.
+ size_t samples; // Z-Test samples.
+};
+
+class PoissonDistributionZTest : public testing::TestWithParam<ZParam>,
+ public PoissonModel {
+ public:
+ PoissonDistributionZTest() : PoissonModel(GetParam().mean) {}
+
+ // ZTestImpl provides a basic z-squared test of the mean vs. expected
+ // mean for data generated by the poisson distribution.
+ template <typename D>
+ bool SingleZTest(const double p, const size_t samples);
+
+ // We use a fixed bit generator for distribution accuracy tests. This allows
+ // these tests to be deterministic, while still testing the qualify of the
+ // implementation.
+ absl::random_internal::pcg64_2018_engine rng_{0x2B7E151628AED2A6};
+};
+
+template <typename D>
+bool PoissonDistributionZTest::SingleZTest(const double p,
+ const size_t samples) {
+ D dis(mean());
+
+ absl::flat_hash_map<int32_t, int> buckets;
+ std::vector<double> data;
+ data.reserve(samples);
+ for (int j = 0; j < samples; j++) {
+ const auto x = dis(rng_);
+ buckets[x]++;
+ data.push_back(x);
+ }
+
+ // The null-hypothesis is that the distribution is a poisson distribution with
+ // the provided mean (not estimated from the data).
+ const auto m = absl::random_internal::ComputeDistributionMoments(data);
+ const double max_err = absl::random_internal::MaxErrorTolerance(p);
+ const double z = absl::random_internal::ZScore(mean(), m);
+ const bool pass = absl::random_internal::Near("z", z, 0.0, max_err);
+
+ if (!pass) {
+ ABSL_INTERNAL_LOG(
+ INFO, absl::StrFormat("p=%f max_err=%f\n"
+ " mean=%f vs. %f\n"
+ " stddev=%f vs. %f\n"
+ " skewness=%f vs. %f\n"
+ " kurtosis=%f vs. %f\n"
+ " z=%f",
+ p, max_err, m.mean, mean(), std::sqrt(m.variance),
+ stddev(), m.skewness, skew(), m.kurtosis,
+ kurtosis(), z));
+ }
+ return pass;
+}
+
+TEST_P(PoissonDistributionZTest, AbslPoissonDistribution) {
+ const auto& param = GetParam();
+ const int expected_failures =
+ std::max(1, static_cast<int>(std::ceil(param.trials * param.p_fail)));
+ const double p = absl::random_internal::RequiredSuccessProbability(
+ param.p_fail, param.trials);
+
+ int failures = 0;
+ for (int i = 0; i < param.trials; i++) {
+ failures +=
+ SingleZTest<absl::poisson_distribution<int32_t>>(p, param.samples) ? 0
+ : 1;
+ }
+ EXPECT_LE(failures, expected_failures);
+}
+
+std::vector<ZParam> GetZParams() {
+ // These values have been adjusted from the "exact" computed values to reduce
+ // failure rates.
+ //
+ // It turns out that the actual values are not as close to the expected values
+ // as would be ideal.
+ return std::vector<ZParam>({
+ // Knuth method.
+ ZParam{0.5, 0.01, 100, 1000},
+ ZParam{1.0, 0.01, 100, 1000},
+ ZParam{10.0, 0.01, 100, 5000},
+ // Split-knuth method.
+ ZParam{20.0, 0.01, 100, 10000},
+ ZParam{50.0, 0.01, 100, 10000},
+ // Ratio of gaussians method.
+ ZParam{51.0, 0.01, 100, 10000},
+ ZParam{200.0, 0.05, 10, 100000},
+ ZParam{100000.0, 0.05, 10, 1000000},
+ });
+}
+
+std::string ZParamName(const ::testing::TestParamInfo<ZParam>& info) {
+ const auto& p = info.param;
+ std::string name = absl::StrCat("mean_", absl::SixDigits(p.mean));
+ return absl::StrReplaceAll(name, {{"+", "_"}, {"-", "_"}, {".", "_"}});
+}
+
+INSTANTIATE_TEST_SUITE_P(All, PoissonDistributionZTest,
+ ::testing::ValuesIn(GetZParams()), ZParamName);
+
+// The PoissonDistributionChiSquaredTest class provides a basic test framework
+// for variates generated by a conforming poisson_distribution.
+class PoissonDistributionChiSquaredTest : public testing::TestWithParam<double>,
+ public PoissonModel {
+ public:
+ PoissonDistributionChiSquaredTest() : PoissonModel(GetParam()) {}
+
+ // The ChiSquaredTestImpl provides a chi-squared goodness of fit test for data
+ // generated by the poisson distribution.
+ template <typename D>
+ double ChiSquaredTestImpl();
+
+ private:
+ void InitChiSquaredTest(const double buckets);
+
+ std::vector<size_t> cutoffs_;
+ std::vector<double> expected_;
+
+ // We use a fixed bit generator for distribution accuracy tests. This allows
+ // these tests to be deterministic, while still testing the qualify of the
+ // implementation.
+ absl::random_internal::pcg64_2018_engine rng_{0x2B7E151628AED2A6};
+};
+
+void PoissonDistributionChiSquaredTest::InitChiSquaredTest(
+ const double buckets) {
+ if (!cutoffs_.empty() && !expected_.empty()) {
+ return;
+ }
+ InitCDF();
+
+ // The code below finds cuttoffs that yield approximately equally-sized
+ // buckets to the extent that it is possible. However for poisson
+ // distributions this is particularly challenging for small mean parameters.
+ // Track the expected proportion of items in each bucket.
+ double last_cdf = 0;
+ const double inc = 1.0 / buckets;
+ for (double p = inc; p <= 1.0; p += inc) {
+ auto result = InverseCDF(p);
+ if (!cutoffs_.empty() && cutoffs_.back() == result.index) {
+ continue;
+ }
+ double d = result.cdf - last_cdf;
+ cutoffs_.push_back(result.index);
+ expected_.push_back(d);
+ last_cdf = result.cdf;
+ }
+ cutoffs_.push_back(std::numeric_limits<size_t>::max());
+ expected_.push_back(std::max(0.0, 1.0 - last_cdf));
+}
+
+template <typename D>
+double PoissonDistributionChiSquaredTest::ChiSquaredTestImpl() {
+ const int kSamples = 2000;
+ const int kBuckets = 50;
+
+ // The poisson CDF fails for large mean values, since e^-mean exceeds the
+ // machine precision. For these cases, using a normal approximation would be
+ // appropriate.
+ ABSL_ASSERT(mean() <= 200);
+ InitChiSquaredTest(kBuckets);
+
+ D dis(mean());
+
+ std::vector<int32_t> counts(cutoffs_.size(), 0);
+ for (int j = 0; j < kSamples; j++) {
+ const size_t x = dis(rng_);
+ auto it = std::lower_bound(std::begin(cutoffs_), std::end(cutoffs_), x);
+ counts[std::distance(cutoffs_.begin(), it)]++;
+ }
+
+ // Normalize the counts.
+ std::vector<int32_t> e(expected_.size(), 0);
+ for (int i = 0; i < e.size(); i++) {
+ e[i] = kSamples * expected_[i];
+ }
+
+ // The null-hypothesis is that the distribution is a poisson distribution with
+ // the provided mean (not estimated from the data).
+ const int dof = static_cast<int>(counts.size()) - 1;
+
+ // The threshold for logging is 1-in-50.
+ const double threshold = absl::random_internal::ChiSquareValue(dof, 0.98);
+
+ const double chi_square = absl::random_internal::ChiSquare(
+ std::begin(counts), std::end(counts), std::begin(e), std::end(e));
+
+ const double p = absl::random_internal::ChiSquarePValue(chi_square, dof);
+
+ // Log if the chi_squared value is above the threshold.
+ if (chi_square > threshold) {
+ LogCDF();
+
+ ABSL_INTERNAL_LOG(INFO, absl::StrCat("VALUES buckets=", counts.size(),
+ " samples=", kSamples));
+ for (size_t i = 0; i < counts.size(); i++) {
+ ABSL_INTERNAL_LOG(
+ INFO, absl::StrCat(cutoffs_[i], ": ", counts[i], " vs. E=", e[i]));
+ }
+
+ ABSL_INTERNAL_LOG(
+ INFO,
+ absl::StrCat(kChiSquared, "(data, dof=", dof, ") = ", chi_square, " (",
+ p, ")\n", " vs.\n", kChiSquared, " @ 0.98 = ", threshold));
+ }
+ return p;
+}
+
+TEST_P(PoissonDistributionChiSquaredTest, AbslPoissonDistribution) {
+ const int kTrials = 20;
+
+ // Large values are not yet supported -- this requires estimating the cdf
+ // using the normal distribution instead of the poisson in this case.
+ ASSERT_LE(mean(), 200.0);
+ if (mean() > 200.0) {
+ return;
+ }
+
+ int failures = 0;
+ for (int i = 0; i < kTrials; i++) {
+ double p_value = ChiSquaredTestImpl<absl::poisson_distribution<int32_t>>();
+ if (p_value < 0.005) {
+ failures++;
+ }
+ }
+ // There is a 0.10% chance of producing at least one failure, so raise the
+ // failure threshold high enough to allow for a flake rate < 10,000.
+ EXPECT_LE(failures, 4);
+}
+
+INSTANTIATE_TEST_SUITE_P(All, PoissonDistributionChiSquaredTest,
+ ::testing::Values(0.5, 1.0, 2.0, 10.0, 50.0, 51.0,
+ 200.0));
+
+// NOTE: absl::poisson_distribution is not guaranteed to be stable.
+TEST(PoissonDistributionTest, StabilityTest) {
+ using testing::ElementsAre;
+ // absl::poisson_distribution stability relies on stability of
+ // std::exp, std::log, std::sqrt, std::ceil, std::floor, and
+ // absl::FastUniformBits, absl::StirlingLogFactorial, absl::RandU64ToDouble.
+ absl::random_internal::sequence_urbg urbg({
+ 0x035b0dc7e0a18acfull, 0x06cebe0d2653682eull, 0x0061e9b23861596bull,
+ 0x0003eb76f6f7f755ull, 0xFFCEA50FDB2F953Bull, 0xC332DDEFBE6C5AA5ull,
+ 0x6558218568AB9702ull, 0x2AEF7DAD5B6E2F84ull, 0x1521B62829076170ull,
+ 0xECDD4775619F1510ull, 0x13CCA830EB61BD96ull, 0x0334FE1EAA0363CFull,
+ 0xB5735C904C70A239ull, 0xD59E9E0BCBAADE14ull, 0xEECC86BC60622CA7ull,
+ 0x4864f22c059bf29eull, 0x247856d8b862665cull, 0xe46e86e9a1337e10ull,
+ 0xd8c8541f3519b133ull, 0xe75b5162c567b9e4ull, 0xf732e5ded7009c5bull,
+ 0xb170b98353121eacull, 0x1ec2e8986d2362caull, 0x814c8e35fe9a961aull,
+ 0x0c3cd59c9b638a02ull, 0xcb3bb6478a07715cull, 0x1224e62c978bbc7full,
+ 0x671ef2cb04e81f6eull, 0x3c1cbd811eaf1808ull, 0x1bbc23cfa8fac721ull,
+ 0xa4c2cda65e596a51ull, 0xb77216fad37adf91ull, 0x836d794457c08849ull,
+ 0xe083df03475f49d7ull, 0xbc9feb512e6b0d6cull, 0xb12d74fdd718c8c5ull,
+ 0x12ff09653bfbe4caull, 0x8dd03a105bc4ee7eull, 0x5738341045ba0d85ull,
+ 0xf3fd722dc65ad09eull, 0xfa14fd21ea2a5705ull, 0xffe6ea4d6edb0c73ull,
+ 0xD07E9EFE2BF11FB4ull, 0x95DBDA4DAE909198ull, 0xEAAD8E716B93D5A0ull,
+ 0xD08ED1D0AFC725E0ull, 0x8E3C5B2F8E7594B7ull, 0x8FF6E2FBF2122B64ull,
+ 0x8888B812900DF01Cull, 0x4FAD5EA0688FC31Cull, 0xD1CFF191B3A8C1ADull,
+ 0x2F2F2218BE0E1777ull, 0xEA752DFE8B021FA1ull, 0xE5A0CC0FB56F74E8ull,
+ 0x18ACF3D6CE89E299ull, 0xB4A84FE0FD13E0B7ull, 0x7CC43B81D2ADA8D9ull,
+ 0x165FA26680957705ull, 0x93CC7314211A1477ull, 0xE6AD206577B5FA86ull,
+ 0xC75442F5FB9D35CFull, 0xEBCDAF0C7B3E89A0ull, 0xD6411BD3AE1E7E49ull,
+ 0x00250E2D2071B35Eull, 0x226800BB57B8E0AFull, 0x2464369BF009B91Eull,
+ 0x5563911D59DFA6AAull, 0x78C14389D95A537Full, 0x207D5BA202E5B9C5ull,
+ 0x832603766295CFA9ull, 0x11C819684E734A41ull, 0xB3472DCA7B14A94Aull,
+ });
+
+ std::vector<int> output(10);
+
+ // Method 1.
+ {
+ absl::poisson_distribution<int> dist(5);
+ std::generate(std::begin(output), std::end(output),
+ [&] { return dist(urbg); });
+ }
+ EXPECT_THAT(output, // mean = 4.2
+ ElementsAre(1, 0, 0, 4, 2, 10, 3, 3, 7, 12));
+
+ // Method 2.
+ {
+ urbg.reset();
+ absl::poisson_distribution<int> dist(25);
+ std::generate(std::begin(output), std::end(output),
+ [&] { return dist(urbg); });
+ }
+ EXPECT_THAT(output, // mean = 19.8
+ ElementsAre(9, 35, 18, 10, 35, 18, 10, 35, 18, 10));
+
+ // Method 3.
+ {
+ urbg.reset();
+ absl::poisson_distribution<int> dist(121);
+ std::generate(std::begin(output), std::end(output),
+ [&] { return dist(urbg); });
+ }
+ EXPECT_THAT(output, // mean = 124.1
+ ElementsAre(161, 122, 129, 124, 112, 112, 117, 120, 130, 114));
+}
+
+TEST(PoissonDistributionTest, AlgorithmExpectedValue_1) {
+ // This tests small values of the Knuth method.
+ // The underlying uniform distribution will generate exactly 0.5.
+ absl::random_internal::sequence_urbg urbg({0x8000000000000001ull});
+ absl::poisson_distribution<int> dist(5);
+ EXPECT_EQ(7, dist(urbg));
+}
+
+TEST(PoissonDistributionTest, AlgorithmExpectedValue_2) {
+ // This tests larger values of the Knuth method.
+ // The underlying uniform distribution will generate exactly 0.5.
+ absl::random_internal::sequence_urbg urbg({0x8000000000000001ull});
+ absl::poisson_distribution<int> dist(25);
+ EXPECT_EQ(36, dist(urbg));
+}
+
+TEST(PoissonDistributionTest, AlgorithmExpectedValue_3) {
+ // This variant uses the ratio of uniforms method.
+ absl::random_internal::sequence_urbg urbg(
+ {0x7fffffffffffffffull, 0x8000000000000000ull});
+
+ absl::poisson_distribution<int> dist(121);
+ EXPECT_EQ(121, dist(urbg));
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/random/random.h b/third_party/abseil/src/absl/random/random.h
new file mode 100644
index 0000000..71b6309
--- /dev/null
+++ b/third_party/abseil/src/absl/random/random.h
@@ -0,0 +1,189 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: random.h
+// -----------------------------------------------------------------------------
+//
+// This header defines the recommended Uniform Random Bit Generator (URBG)
+// types for use within the Abseil Random library. These types are not
+// suitable for security-related use-cases, but should suffice for most other
+// uses of generating random values.
+//
+// The Abseil random library provides the following URBG types:
+//
+// * BitGen, a good general-purpose bit generator, optimized for generating
+// random (but not cryptographically secure) values
+// * InsecureBitGen, a slightly faster, though less random, bit generator, for
+// cases where the existing BitGen is a drag on performance.
+
+#ifndef ABSL_RANDOM_RANDOM_H_
+#define ABSL_RANDOM_RANDOM_H_
+
+#include <random>
+
+#include "absl/random/distributions.h" // IWYU pragma: export
+#include "absl/random/internal/nonsecure_base.h" // IWYU pragma: export
+#include "absl/random/internal/pcg_engine.h" // IWYU pragma: export
+#include "absl/random/internal/pool_urbg.h"
+#include "absl/random/internal/randen_engine.h"
+#include "absl/random/seed_sequences.h" // IWYU pragma: export
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+// -----------------------------------------------------------------------------
+// absl::BitGen
+// -----------------------------------------------------------------------------
+//
+// `absl::BitGen` is a general-purpose random bit generator for generating
+// random values for use within the Abseil random library. Typically, you use a
+// bit generator in combination with a distribution to provide random values.
+//
+// Example:
+//
+// // Create an absl::BitGen. There is no need to seed this bit generator.
+// absl::BitGen gen;
+//
+// // Generate an integer value in the closed interval [1,6]
+// int die_roll = absl::uniform_int_distribution<int>(1, 6)(gen);
+//
+// `absl::BitGen` is seeded by default with non-deterministic data to produce
+// different sequences of random values across different instances, including
+// different binary invocations. This behavior is different than the standard
+// library bit generators, which use golden values as their seeds. Default
+// construction intentionally provides no stability guarantees, to avoid
+// accidental dependence on such a property.
+//
+// `absl::BitGen` may be constructed with an optional seed sequence type,
+// conforming to [rand.req.seed_seq], which will be mixed with additional
+// non-deterministic data.
+//
+// Example:
+//
+// // Create an absl::BitGen using an std::seed_seq seed sequence
+// std::seed_seq seq{1,2,3};
+// absl::BitGen gen_with_seed(seq);
+//
+// // Generate an integer value in the closed interval [1,6]
+// int die_roll2 = absl::uniform_int_distribution<int>(1, 6)(gen_with_seed);
+//
+// `absl::BitGen` meets the requirements of the Uniform Random Bit Generator
+// (URBG) concept as per the C++17 standard [rand.req.urng] though differs
+// slightly with [rand.req.eng]. Like its standard library equivalents (e.g.
+// `std::mersenne_twister_engine`) `absl::BitGen` is not cryptographically
+// secure.
+//
+// Constructing two `absl::BitGen`s with the same seed sequence in the same
+// binary will produce the same sequence of variates within the same binary, but
+// need not do so across multiple binary invocations.
+//
+// This type has been optimized to perform better than Mersenne Twister
+// (https://en.wikipedia.org/wiki/Mersenne_Twister) and many other complex URBG
+// types on modern x86, ARM, and PPC architectures.
+//
+// This type is thread-compatible, but not thread-safe.
+
+// ---------------------------------------------------------------------------
+// absl::BitGen member functions
+// ---------------------------------------------------------------------------
+
+// absl::BitGen::operator()()
+//
+// Calls the BitGen, returning a generated value.
+
+// absl::BitGen::min()
+//
+// Returns the smallest possible value from this bit generator.
+
+// absl::BitGen::max()
+//
+// Returns the largest possible value from this bit generator.
+
+// absl::BitGen::discard(num)
+//
+// Advances the internal state of this bit generator by `num` times, and
+// discards the intermediate results.
+// ---------------------------------------------------------------------------
+
+using BitGen = random_internal::NonsecureURBGBase<
+ random_internal::randen_engine<uint64_t>>;
+
+// -----------------------------------------------------------------------------
+// absl::InsecureBitGen
+// -----------------------------------------------------------------------------
+//
+// `absl::InsecureBitGen` is an efficient random bit generator for generating
+// random values, recommended only for performance-sensitive use cases where
+// `absl::BitGen` is not satisfactory when compute-bounded by bit generation
+// costs.
+//
+// Example:
+//
+// // Create an absl::InsecureBitGen
+// absl::InsecureBitGen gen;
+// for (size_t i = 0; i < 1000000; i++) {
+//
+// // Generate a bunch of random values from some complex distribution
+// auto my_rnd = some_distribution(gen, 1, 1000);
+// }
+//
+// Like `absl::BitGen`, `absl::InsecureBitGen` is seeded by default with
+// non-deterministic data to produce different sequences of random values across
+// different instances, including different binary invocations. (This behavior
+// is different than the standard library bit generators, which use golden
+// values as their seeds.)
+//
+// `absl::InsecureBitGen` may be constructed with an optional seed sequence
+// type, conforming to [rand.req.seed_seq], which will be mixed with additional
+// non-deterministic data. (See std_seed_seq.h for more information.)
+//
+// `absl::InsecureBitGen` meets the requirements of the Uniform Random Bit
+// Generator (URBG) concept as per the C++17 standard [rand.req.urng] though
+// its implementation differs slightly with [rand.req.eng]. Like its standard
+// library equivalents (e.g. `std::mersenne_twister_engine`)
+// `absl::InsecureBitGen` is not cryptographically secure.
+//
+// Prefer `absl::BitGen` over `absl::InsecureBitGen` as the general type is
+// often fast enough for the vast majority of applications.
+
+using InsecureBitGen =
+ random_internal::NonsecureURBGBase<random_internal::pcg64_2018_engine>;
+
+// ---------------------------------------------------------------------------
+// absl::InsecureBitGen member functions
+// ---------------------------------------------------------------------------
+
+// absl::InsecureBitGen::operator()()
+//
+// Calls the InsecureBitGen, returning a generated value.
+
+// absl::InsecureBitGen::min()
+//
+// Returns the smallest possible value from this bit generator.
+
+// absl::InsecureBitGen::max()
+//
+// Returns the largest possible value from this bit generator.
+
+// absl::InsecureBitGen::discard(num)
+//
+// Advances the internal state of this bit generator by `num` times, and
+// discards the intermediate results.
+// ---------------------------------------------------------------------------
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_RANDOM_RANDOM_H_
diff --git a/third_party/abseil/src/absl/random/seed_gen_exception.cc b/third_party/abseil/src/absl/random/seed_gen_exception.cc
new file mode 100644
index 0000000..fdcb54a
--- /dev/null
+++ b/third_party/abseil/src/absl/random/seed_gen_exception.cc
@@ -0,0 +1,46 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/random/seed_gen_exception.h"
+
+#include <iostream>
+
+#include "absl/base/config.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+static constexpr const char kExceptionMessage[] =
+ "Failed generating seed-material for URBG.";
+
+SeedGenException::~SeedGenException() = default;
+
+const char* SeedGenException::what() const noexcept {
+ return kExceptionMessage;
+}
+
+namespace random_internal {
+
+void ThrowSeedGenException() {
+#ifdef ABSL_HAVE_EXCEPTIONS
+ throw absl::SeedGenException();
+#else
+ std::cerr << kExceptionMessage << std::endl;
+ std::terminate();
+#endif
+}
+
+} // namespace random_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/random/seed_gen_exception.h b/third_party/abseil/src/absl/random/seed_gen_exception.h
new file mode 100644
index 0000000..5353900
--- /dev/null
+++ b/third_party/abseil/src/absl/random/seed_gen_exception.h
@@ -0,0 +1,55 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: seed_gen_exception.h
+// -----------------------------------------------------------------------------
+//
+// This header defines an exception class which may be thrown if unpredictable
+// events prevent the derivation of suitable seed-material for constructing a
+// bit generator conforming to [rand.req.urng] (eg. entropy cannot be read from
+// /dev/urandom on a Unix-based system).
+//
+// Note: if exceptions are disabled, `std::terminate()` is called instead.
+
+#ifndef ABSL_RANDOM_SEED_GEN_EXCEPTION_H_
+#define ABSL_RANDOM_SEED_GEN_EXCEPTION_H_
+
+#include <exception>
+
+#include "absl/base/config.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+//------------------------------------------------------------------------------
+// SeedGenException
+//------------------------------------------------------------------------------
+class SeedGenException : public std::exception {
+ public:
+ SeedGenException() = default;
+ ~SeedGenException() override;
+ const char* what() const noexcept override;
+};
+
+namespace random_internal {
+
+// throw delegator
+[[noreturn]] void ThrowSeedGenException();
+
+} // namespace random_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_RANDOM_SEED_GEN_EXCEPTION_H_
diff --git a/third_party/abseil/src/absl/random/seed_sequences.cc b/third_party/abseil/src/absl/random/seed_sequences.cc
new file mode 100644
index 0000000..426eafd
--- /dev/null
+++ b/third_party/abseil/src/absl/random/seed_sequences.cc
@@ -0,0 +1,29 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/random/seed_sequences.h"
+
+#include "absl/random/internal/pool_urbg.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+SeedSeq MakeSeedSeq() {
+ SeedSeq::result_type seed_material[8];
+ random_internal::RandenPool<uint32_t>::Fill(absl::MakeSpan(seed_material));
+ return SeedSeq(std::begin(seed_material), std::end(seed_material));
+}
+
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/random/seed_sequences.h b/third_party/abseil/src/absl/random/seed_sequences.h
new file mode 100644
index 0000000..ff1340c
--- /dev/null
+++ b/third_party/abseil/src/absl/random/seed_sequences.h
@@ -0,0 +1,110 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: seed_sequences.h
+// -----------------------------------------------------------------------------
+//
+// This header contains utilities for creating and working with seed sequences
+// conforming to [rand.req.seedseq]. In general, direct construction of seed
+// sequences is discouraged, but use-cases for construction of identical bit
+// generators (using the same seed sequence) may be helpful (e.g. replaying a
+// simulation whose state is derived from variates of a bit generator).
+
+#ifndef ABSL_RANDOM_SEED_SEQUENCES_H_
+#define ABSL_RANDOM_SEED_SEQUENCES_H_
+
+#include <iterator>
+#include <random>
+
+#include "absl/random/internal/salted_seed_seq.h"
+#include "absl/random/internal/seed_material.h"
+#include "absl/random/seed_gen_exception.h"
+#include "absl/types/span.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+// -----------------------------------------------------------------------------
+// absl::SeedSeq
+// -----------------------------------------------------------------------------
+//
+// `absl::SeedSeq` constructs a seed sequence according to [rand.req.seedseq]
+// for use within bit generators. `absl::SeedSeq`, unlike `std::seed_seq`
+// additionally salts the generated seeds with extra implementation-defined
+// entropy. For that reason, you can use `absl::SeedSeq` in combination with
+// standard library bit generators (e.g. `std::mt19937`) to introduce
+// non-determinism in your seeds.
+//
+// Example:
+//
+// absl::SeedSeq my_seed_seq({a, b, c});
+// std::mt19937 my_bitgen(my_seed_seq);
+//
+using SeedSeq = random_internal::SaltedSeedSeq<std::seed_seq>;
+
+// -----------------------------------------------------------------------------
+// absl::CreateSeedSeqFrom(bitgen*)
+// -----------------------------------------------------------------------------
+//
+// Constructs a seed sequence conforming to [rand.req.seedseq] using variates
+// produced by a provided bit generator.
+//
+// You should generally avoid direct construction of seed sequences, but
+// use-cases for reuse of a seed sequence to construct identical bit generators
+// may be helpful (eg. replaying a simulation whose state is derived from bit
+// generator values).
+//
+// If bitgen == nullptr, then behavior is undefined.
+//
+// Example:
+//
+// absl::BitGen my_bitgen;
+// auto seed_seq = absl::CreateSeedSeqFrom(&my_bitgen);
+// absl::BitGen new_engine(seed_seq); // derived from my_bitgen, but not
+// // correlated.
+//
+template <typename URBG>
+SeedSeq CreateSeedSeqFrom(URBG* urbg) {
+ SeedSeq::result_type
+ seed_material[random_internal::kEntropyBlocksNeeded];
+
+ if (!random_internal::ReadSeedMaterialFromURBG(
+ urbg, absl::MakeSpan(seed_material))) {
+ random_internal::ThrowSeedGenException();
+ }
+ return SeedSeq(std::begin(seed_material), std::end(seed_material));
+}
+
+// -----------------------------------------------------------------------------
+// absl::MakeSeedSeq()
+// -----------------------------------------------------------------------------
+//
+// Constructs an `absl::SeedSeq` salting the generated values using
+// implementation-defined entropy. The returned sequence can be used to create
+// equivalent bit generators correlated using this sequence.
+//
+// Example:
+//
+// auto my_seed_seq = absl::MakeSeedSeq();
+// std::mt19937 rng1(my_seed_seq);
+// std::mt19937 rng2(my_seed_seq);
+// EXPECT_EQ(rng1(), rng2());
+//
+SeedSeq MakeSeedSeq();
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_RANDOM_SEED_SEQUENCES_H_
diff --git a/third_party/abseil/src/absl/random/seed_sequences_test.cc b/third_party/abseil/src/absl/random/seed_sequences_test.cc
new file mode 100644
index 0000000..fe1100b
--- /dev/null
+++ b/third_party/abseil/src/absl/random/seed_sequences_test.cc
@@ -0,0 +1,126 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/random/seed_sequences.h"
+
+#include <iterator>
+#include <random>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/random/internal/nonsecure_base.h"
+#include "absl/random/random.h"
+namespace {
+
+TEST(SeedSequences, Examples) {
+ {
+ absl::SeedSeq seed_seq({1, 2, 3});
+ absl::BitGen bitgen(seed_seq);
+
+ EXPECT_NE(0, bitgen());
+ }
+ {
+ absl::BitGen engine;
+ auto seed_seq = absl::CreateSeedSeqFrom(&engine);
+ absl::BitGen bitgen(seed_seq);
+
+ EXPECT_NE(engine(), bitgen());
+ }
+ {
+ auto seed_seq = absl::MakeSeedSeq();
+ std::mt19937 random(seed_seq);
+
+ EXPECT_NE(0, random());
+ }
+}
+
+TEST(CreateSeedSeqFrom, CompatibleWithStdTypes) {
+ using ExampleNonsecureURBG =
+ absl::random_internal::NonsecureURBGBase<std::minstd_rand0>;
+
+ // Construct a URBG instance.
+ ExampleNonsecureURBG rng;
+
+ // Construct a Seed Sequence from its variates.
+ auto seq_from_rng = absl::CreateSeedSeqFrom(&rng);
+
+ // Ensure that another URBG can be validly constructed from the Seed Sequence.
+ std::mt19937_64{seq_from_rng};
+}
+
+TEST(CreateSeedSeqFrom, CompatibleWithBitGenerator) {
+ // Construct a URBG instance.
+ absl::BitGen rng;
+
+ // Construct a Seed Sequence from its variates.
+ auto seq_from_rng = absl::CreateSeedSeqFrom(&rng);
+
+ // Ensure that another URBG can be validly constructed from the Seed Sequence.
+ std::mt19937_64{seq_from_rng};
+}
+
+TEST(CreateSeedSeqFrom, CompatibleWithInsecureBitGen) {
+ // Construct a URBG instance.
+ absl::InsecureBitGen rng;
+
+ // Construct a Seed Sequence from its variates.
+ auto seq_from_rng = absl::CreateSeedSeqFrom(&rng);
+
+ // Ensure that another URBG can be validly constructed from the Seed Sequence.
+ std::mt19937_64{seq_from_rng};
+}
+
+TEST(CreateSeedSeqFrom, CompatibleWithRawURBG) {
+ // Construct a URBG instance.
+ std::random_device urandom;
+
+ // Construct a Seed Sequence from its variates, using 64b of seed-material.
+ auto seq_from_rng = absl::CreateSeedSeqFrom(&urandom);
+
+ // Ensure that another URBG can be validly constructed from the Seed Sequence.
+ std::mt19937_64{seq_from_rng};
+}
+
+template <typename URBG>
+void TestReproducibleVariateSequencesForNonsecureURBG() {
+ const size_t kNumVariates = 1000;
+
+ URBG rng;
+ // Reused for both RNG instances.
+ auto reusable_seed = absl::CreateSeedSeqFrom(&rng);
+
+ typename URBG::result_type variates[kNumVariates];
+ {
+ URBG child(reusable_seed);
+ for (auto& variate : variates) {
+ variate = child();
+ }
+ }
+ // Ensure that variate-sequence can be "replayed" by identical RNG.
+ {
+ URBG child(reusable_seed);
+ for (auto& variate : variates) {
+ ASSERT_EQ(variate, child());
+ }
+ }
+}
+
+TEST(CreateSeedSeqFrom, ReproducesVariateSequencesForInsecureBitGen) {
+ TestReproducibleVariateSequencesForNonsecureURBG<absl::InsecureBitGen>();
+}
+
+TEST(CreateSeedSeqFrom, ReproducesVariateSequencesForBitGenerator) {
+ TestReproducibleVariateSequencesForNonsecureURBG<absl::BitGen>();
+}
+} // namespace
diff --git a/third_party/abseil/src/absl/random/uniform_int_distribution.h b/third_party/abseil/src/absl/random/uniform_int_distribution.h
new file mode 100644
index 0000000..c1f54cc
--- /dev/null
+++ b/third_party/abseil/src/absl/random/uniform_int_distribution.h
@@ -0,0 +1,275 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: uniform_int_distribution.h
+// -----------------------------------------------------------------------------
+//
+// This header defines a class for representing a uniform integer distribution
+// over the closed (inclusive) interval [a,b]. You use this distribution in
+// combination with an Abseil random bit generator to produce random values
+// according to the rules of the distribution.
+//
+// `absl::uniform_int_distribution` is a drop-in replacement for the C++11
+// `std::uniform_int_distribution` [rand.dist.uni.int] but is considerably
+// faster than the libstdc++ implementation.
+
+#ifndef ABSL_RANDOM_UNIFORM_INT_DISTRIBUTION_H_
+#define ABSL_RANDOM_UNIFORM_INT_DISTRIBUTION_H_
+
+#include <cassert>
+#include <istream>
+#include <limits>
+#include <type_traits>
+
+#include "absl/base/optimization.h"
+#include "absl/random/internal/fast_uniform_bits.h"
+#include "absl/random/internal/iostream_state_saver.h"
+#include "absl/random/internal/traits.h"
+#include "absl/random/internal/wide_multiply.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+// absl::uniform_int_distribution<T>
+//
+// This distribution produces random integer values uniformly distributed in the
+// closed (inclusive) interval [a, b].
+//
+// Example:
+//
+// absl::BitGen gen;
+//
+// // Use the distribution to produce a value between 1 and 6, inclusive.
+// int die_roll = absl::uniform_int_distribution<int>(1, 6)(gen);
+//
+template <typename IntType = int>
+class uniform_int_distribution {
+ private:
+ using unsigned_type =
+ typename random_internal::make_unsigned_bits<IntType>::type;
+
+ public:
+ using result_type = IntType;
+
+ class param_type {
+ public:
+ using distribution_type = uniform_int_distribution;
+
+ explicit param_type(
+ result_type lo = 0,
+ result_type hi = (std::numeric_limits<result_type>::max)())
+ : lo_(lo),
+ range_(static_cast<unsigned_type>(hi) -
+ static_cast<unsigned_type>(lo)) {
+ // [rand.dist.uni.int] precondition 2
+ assert(lo <= hi);
+ }
+
+ result_type a() const { return lo_; }
+ result_type b() const {
+ return static_cast<result_type>(static_cast<unsigned_type>(lo_) + range_);
+ }
+
+ friend bool operator==(const param_type& a, const param_type& b) {
+ return a.lo_ == b.lo_ && a.range_ == b.range_;
+ }
+
+ friend bool operator!=(const param_type& a, const param_type& b) {
+ return !(a == b);
+ }
+
+ private:
+ friend class uniform_int_distribution;
+ unsigned_type range() const { return range_; }
+
+ result_type lo_;
+ unsigned_type range_;
+
+ static_assert(std::is_integral<result_type>::value,
+ "Class-template absl::uniform_int_distribution<> must be "
+ "parameterized using an integral type.");
+ }; // param_type
+
+ uniform_int_distribution() : uniform_int_distribution(0) {}
+
+ explicit uniform_int_distribution(
+ result_type lo,
+ result_type hi = (std::numeric_limits<result_type>::max)())
+ : param_(lo, hi) {}
+
+ explicit uniform_int_distribution(const param_type& param) : param_(param) {}
+
+ // uniform_int_distribution<T>::reset()
+ //
+ // Resets the uniform int distribution. Note that this function has no effect
+ // because the distribution already produces independent values.
+ void reset() {}
+
+ template <typename URBG>
+ result_type operator()(URBG& gen) { // NOLINT(runtime/references)
+ return (*this)(gen, param());
+ }
+
+ template <typename URBG>
+ result_type operator()(
+ URBG& gen, const param_type& param) { // NOLINT(runtime/references)
+ return param.a() + Generate(gen, param.range());
+ }
+
+ result_type a() const { return param_.a(); }
+ result_type b() const { return param_.b(); }
+
+ param_type param() const { return param_; }
+ void param(const param_type& params) { param_ = params; }
+
+ result_type(min)() const { return a(); }
+ result_type(max)() const { return b(); }
+
+ friend bool operator==(const uniform_int_distribution& a,
+ const uniform_int_distribution& b) {
+ return a.param_ == b.param_;
+ }
+ friend bool operator!=(const uniform_int_distribution& a,
+ const uniform_int_distribution& b) {
+ return !(a == b);
+ }
+
+ private:
+ // Generates a value in the *closed* interval [0, R]
+ template <typename URBG>
+ unsigned_type Generate(URBG& g, // NOLINT(runtime/references)
+ unsigned_type R);
+ param_type param_;
+};
+
+// -----------------------------------------------------------------------------
+// Implementation details follow
+// -----------------------------------------------------------------------------
+template <typename CharT, typename Traits, typename IntType>
+std::basic_ostream<CharT, Traits>& operator<<(
+ std::basic_ostream<CharT, Traits>& os,
+ const uniform_int_distribution<IntType>& x) {
+ using stream_type =
+ typename random_internal::stream_format_type<IntType>::type;
+ auto saver = random_internal::make_ostream_state_saver(os);
+ os << static_cast<stream_type>(x.a()) << os.fill()
+ << static_cast<stream_type>(x.b());
+ return os;
+}
+
+template <typename CharT, typename Traits, typename IntType>
+std::basic_istream<CharT, Traits>& operator>>(
+ std::basic_istream<CharT, Traits>& is,
+ uniform_int_distribution<IntType>& x) {
+ using param_type = typename uniform_int_distribution<IntType>::param_type;
+ using result_type = typename uniform_int_distribution<IntType>::result_type;
+ using stream_type =
+ typename random_internal::stream_format_type<IntType>::type;
+
+ stream_type a;
+ stream_type b;
+
+ auto saver = random_internal::make_istream_state_saver(is);
+ is >> a >> b;
+ if (!is.fail()) {
+ x.param(
+ param_type(static_cast<result_type>(a), static_cast<result_type>(b)));
+ }
+ return is;
+}
+
+template <typename IntType>
+template <typename URBG>
+typename random_internal::make_unsigned_bits<IntType>::type
+uniform_int_distribution<IntType>::Generate(
+ URBG& g, // NOLINT(runtime/references)
+ typename random_internal::make_unsigned_bits<IntType>::type R) {
+ random_internal::FastUniformBits<unsigned_type> fast_bits;
+ unsigned_type bits = fast_bits(g);
+ const unsigned_type Lim = R + 1;
+ if ((R & Lim) == 0) {
+ // If the interval's length is a power of two range, just take the low bits.
+ return bits & R;
+ }
+
+ // Generates a uniform variate on [0, Lim) using fixed-point multiplication.
+ // The above fast-path guarantees that Lim is representable in unsigned_type.
+ //
+ // Algorithm adapted from
+ // http://lemire.me/blog/2016/06/30/fast-random-shuffling/, with added
+ // explanation.
+ //
+ // The algorithm creates a uniform variate `bits` in the interval [0, 2^N),
+ // and treats it as the fractional part of a fixed-point real value in [0, 1),
+ // multiplied by 2^N. For example, 0.25 would be represented as 2^(N - 2),
+ // because 2^N * 0.25 == 2^(N - 2).
+ //
+ // Next, `bits` and `Lim` are multiplied with a wide-multiply to bring the
+ // value into the range [0, Lim). The integral part (the high word of the
+ // multiplication result) is then very nearly the desired result. However,
+ // this is not quite accurate; viewing the multiplication result as one
+ // double-width integer, the resulting values for the sample are mapped as
+ // follows:
+ //
+ // If the result lies in this interval: Return this value:
+ // [0, 2^N) 0
+ // [2^N, 2 * 2^N) 1
+ // ... ...
+ // [K * 2^N, (K + 1) * 2^N) K
+ // ... ...
+ // [(Lim - 1) * 2^N, Lim * 2^N) Lim - 1
+ //
+ // While all of these intervals have the same size, the result of `bits * Lim`
+ // must be a multiple of `Lim`, and not all of these intervals contain the
+ // same number of multiples of `Lim`. In particular, some contain
+ // `F = floor(2^N / Lim)` and some contain `F + 1 = ceil(2^N / Lim)`. This
+ // difference produces a small nonuniformity, which is corrected by applying
+ // rejection sampling to one of the values in the "larger intervals" (i.e.,
+ // the intervals containing `F + 1` multiples of `Lim`.
+ //
+ // An interval contains `F + 1` multiples of `Lim` if and only if its smallest
+ // value modulo 2^N is less than `2^N % Lim`. The unique value satisfying
+ // this property is used as the one for rejection. That is, a value of
+ // `bits * Lim` is rejected if `(bit * Lim) % 2^N < (2^N % Lim)`.
+
+ using helper = random_internal::wide_multiply<unsigned_type>;
+ auto product = helper::multiply(bits, Lim);
+
+ // Two optimizations here:
+ // * Rejection occurs with some probability less than 1/2, and for reasonable
+ // ranges considerably less (in particular, less than 1/(F+1)), so
+ // ABSL_PREDICT_FALSE is apt.
+ // * `Lim` is an overestimate of `threshold`, and doesn't require a divide.
+ if (ABSL_PREDICT_FALSE(helper::lo(product) < Lim)) {
+ // This quantity is exactly equal to `2^N % Lim`, but does not require high
+ // precision calculations: `2^N % Lim` is congruent to `(2^N - Lim) % Lim`.
+ // Ideally this could be expressed simply as `-X` rather than `2^N - X`, but
+ // for types smaller than int, this calculation is incorrect due to integer
+ // promotion rules.
+ const unsigned_type threshold =
+ ((std::numeric_limits<unsigned_type>::max)() - Lim + 1) % Lim;
+ while (helper::lo(product) < threshold) {
+ bits = fast_bits(g);
+ product = helper::multiply(bits, Lim);
+ }
+ }
+
+ return helper::hi(product);
+}
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_RANDOM_UNIFORM_INT_DISTRIBUTION_H_
diff --git a/third_party/abseil/src/absl/random/uniform_int_distribution_test.cc b/third_party/abseil/src/absl/random/uniform_int_distribution_test.cc
new file mode 100644
index 0000000..276d72a
--- /dev/null
+++ b/third_party/abseil/src/absl/random/uniform_int_distribution_test.cc
@@ -0,0 +1,259 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/random/uniform_int_distribution.h"
+
+#include <cmath>
+#include <cstdint>
+#include <iterator>
+#include <random>
+#include <sstream>
+#include <vector>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/base/internal/raw_logging.h"
+#include "absl/random/internal/chi_square.h"
+#include "absl/random/internal/distribution_test_util.h"
+#include "absl/random/internal/pcg_engine.h"
+#include "absl/random/internal/sequence_urbg.h"
+#include "absl/random/random.h"
+#include "absl/strings/str_cat.h"
+
+namespace {
+
+template <typename IntType>
+class UniformIntDistributionTest : public ::testing::Test {};
+
+using IntTypes = ::testing::Types<int8_t, uint8_t, int16_t, uint16_t, int32_t,
+ uint32_t, int64_t, uint64_t>;
+TYPED_TEST_SUITE(UniformIntDistributionTest, IntTypes);
+
+TYPED_TEST(UniformIntDistributionTest, ParamSerializeTest) {
+ // This test essentially ensures that the parameters serialize,
+ // not that the values generated cover the full range.
+ using Limits = std::numeric_limits<TypeParam>;
+ using param_type =
+ typename absl::uniform_int_distribution<TypeParam>::param_type;
+ const TypeParam kMin = std::is_unsigned<TypeParam>::value ? 37 : -105;
+ const TypeParam kNegOneOrZero = std::is_unsigned<TypeParam>::value ? 0 : -1;
+
+ constexpr int kCount = 1000;
+ absl::InsecureBitGen gen;
+ for (const auto& param : {
+ param_type(),
+ param_type(2, 2), // Same
+ param_type(9, 32),
+ param_type(kMin, 115),
+ param_type(kNegOneOrZero, Limits::max()),
+ param_type(Limits::min(), Limits::max()),
+ param_type(Limits::lowest(), Limits::max()),
+ param_type(Limits::min() + 1, Limits::max() - 1),
+ }) {
+ const auto a = param.a();
+ const auto b = param.b();
+ absl::uniform_int_distribution<TypeParam> before(a, b);
+ EXPECT_EQ(before.a(), param.a());
+ EXPECT_EQ(before.b(), param.b());
+
+ {
+ // Initialize via param_type
+ absl::uniform_int_distribution<TypeParam> via_param(param);
+ EXPECT_EQ(via_param, before);
+ }
+
+ // Initialize via iostreams
+ std::stringstream ss;
+ ss << before;
+
+ absl::uniform_int_distribution<TypeParam> after(Limits::min() + 3,
+ Limits::max() - 5);
+
+ EXPECT_NE(before.a(), after.a());
+ EXPECT_NE(before.b(), after.b());
+ EXPECT_NE(before.param(), after.param());
+ EXPECT_NE(before, after);
+
+ ss >> after;
+
+ EXPECT_EQ(before.a(), after.a());
+ EXPECT_EQ(before.b(), after.b());
+ EXPECT_EQ(before.param(), after.param());
+ EXPECT_EQ(before, after);
+
+ // Smoke test.
+ auto sample_min = after.max();
+ auto sample_max = after.min();
+ for (int i = 0; i < kCount; i++) {
+ auto sample = after(gen);
+ EXPECT_GE(sample, after.min());
+ EXPECT_LE(sample, after.max());
+ if (sample > sample_max) {
+ sample_max = sample;
+ }
+ if (sample < sample_min) {
+ sample_min = sample;
+ }
+ }
+ std::string msg = absl::StrCat("Range: ", +sample_min, ", ", +sample_max);
+ ABSL_RAW_LOG(INFO, "%s", msg.c_str());
+ }
+}
+
+TYPED_TEST(UniformIntDistributionTest, ViolatesPreconditionsDeathTest) {
+#if GTEST_HAS_DEATH_TEST
+ // Hi < Lo
+ EXPECT_DEBUG_DEATH({ absl::uniform_int_distribution<TypeParam> dist(10, 1); },
+ "");
+#endif // GTEST_HAS_DEATH_TEST
+#if defined(NDEBUG)
+ // opt-mode, for invalid parameters, will generate a garbage value,
+ // but should not enter an infinite loop.
+ absl::InsecureBitGen gen;
+ absl::uniform_int_distribution<TypeParam> dist(10, 1);
+ auto x = dist(gen);
+
+ // Any value will generate a non-empty string.
+ EXPECT_FALSE(absl::StrCat(+x).empty()) << x;
+#endif // NDEBUG
+}
+
+TYPED_TEST(UniformIntDistributionTest, TestMoments) {
+ constexpr int kSize = 100000;
+ using Limits = std::numeric_limits<TypeParam>;
+ using param_type =
+ typename absl::uniform_int_distribution<TypeParam>::param_type;
+
+ // We use a fixed bit generator for distribution accuracy tests. This allows
+ // these tests to be deterministic, while still testing the qualify of the
+ // implementation.
+ absl::random_internal::pcg64_2018_engine rng{0x2B7E151628AED2A6};
+
+ std::vector<double> values(kSize);
+ for (const auto& param :
+ {param_type(0, Limits::max()), param_type(13, 127)}) {
+ absl::uniform_int_distribution<TypeParam> dist(param);
+ for (int i = 0; i < kSize; i++) {
+ const auto sample = dist(rng);
+ ASSERT_LE(dist.param().a(), sample);
+ ASSERT_GE(dist.param().b(), sample);
+ values[i] = sample;
+ }
+
+ auto moments = absl::random_internal::ComputeDistributionMoments(values);
+ const double a = dist.param().a();
+ const double b = dist.param().b();
+ const double n = (b - a + 1);
+ const double mean = (a + b) / 2;
+ const double var = ((b - a + 1) * (b - a + 1) - 1) / 12;
+ const double kurtosis = 3 - 6 * (n * n + 1) / (5 * (n * n - 1));
+
+ // TODO(ahh): this is not the right bound
+ // empirically validated with --runs_per_test=10000.
+ EXPECT_NEAR(mean, moments.mean, 0.01 * var);
+ EXPECT_NEAR(var, moments.variance, 0.015 * var);
+ EXPECT_NEAR(0.0, moments.skewness, 0.025);
+ EXPECT_NEAR(kurtosis, moments.kurtosis, 0.02 * kurtosis);
+ }
+}
+
+TYPED_TEST(UniformIntDistributionTest, ChiSquaredTest50) {
+ using absl::random_internal::kChiSquared;
+
+ constexpr size_t kTrials = 1000;
+ constexpr int kBuckets = 50; // inclusive, so actally +1
+ constexpr double kExpected =
+ static_cast<double>(kTrials) / static_cast<double>(kBuckets);
+
+ // Empirically validated with --runs_per_test=10000.
+ const int kThreshold =
+ absl::random_internal::ChiSquareValue(kBuckets, 0.999999);
+
+ const TypeParam min = std::is_unsigned<TypeParam>::value ? 37 : -37;
+ const TypeParam max = min + kBuckets;
+
+ // We use a fixed bit generator for distribution accuracy tests. This allows
+ // these tests to be deterministic, while still testing the qualify of the
+ // implementation.
+ absl::random_internal::pcg64_2018_engine rng{0x2B7E151628AED2A6};
+
+ absl::uniform_int_distribution<TypeParam> dist(min, max);
+
+ std::vector<int32_t> counts(kBuckets + 1, 0);
+ for (size_t i = 0; i < kTrials; i++) {
+ auto x = dist(rng);
+ counts[x - min]++;
+ }
+ double chi_square = absl::random_internal::ChiSquareWithExpected(
+ std::begin(counts), std::end(counts), kExpected);
+ if (chi_square > kThreshold) {
+ double p_value =
+ absl::random_internal::ChiSquarePValue(chi_square, kBuckets);
+
+ // Chi-squared test failed. Output does not appear to be uniform.
+ std::string msg;
+ for (const auto& a : counts) {
+ absl::StrAppend(&msg, a, "\n");
+ }
+ absl::StrAppend(&msg, kChiSquared, " p-value ", p_value, "\n");
+ absl::StrAppend(&msg, "High ", kChiSquared, " value: ", chi_square, " > ",
+ kThreshold);
+ ABSL_RAW_LOG(INFO, "%s", msg.c_str());
+ FAIL() << msg;
+ }
+}
+
+TEST(UniformIntDistributionTest, StabilityTest) {
+ // absl::uniform_int_distribution stability relies only on integer operations.
+ absl::random_internal::sequence_urbg urbg(
+ {0x0003eb76f6f7f755ull, 0xFFCEA50FDB2F953Bull, 0xC332DDEFBE6C5AA5ull,
+ 0x6558218568AB9702ull, 0x2AEF7DAD5B6E2F84ull, 0x1521B62829076170ull,
+ 0xECDD4775619F1510ull, 0x13CCA830EB61BD96ull, 0x0334FE1EAA0363CFull,
+ 0xB5735C904C70A239ull, 0xD59E9E0BCBAADE14ull, 0xEECC86BC60622CA7ull});
+
+ std::vector<int> output(12);
+
+ {
+ absl::uniform_int_distribution<int32_t> dist(0, 4);
+ for (auto& v : output) {
+ v = dist(urbg);
+ }
+ }
+ EXPECT_EQ(12, urbg.invocations());
+ EXPECT_THAT(output, testing::ElementsAre(4, 4, 3, 2, 1, 0, 1, 4, 3, 1, 3, 1));
+
+ {
+ urbg.reset();
+ absl::uniform_int_distribution<int32_t> dist(0, 100);
+ for (auto& v : output) {
+ v = dist(urbg);
+ }
+ }
+ EXPECT_EQ(12, urbg.invocations());
+ EXPECT_THAT(output, testing::ElementsAre(97, 86, 75, 41, 36, 16, 38, 92, 67,
+ 30, 80, 38));
+
+ {
+ urbg.reset();
+ absl::uniform_int_distribution<int32_t> dist(0, 10000);
+ for (auto& v : output) {
+ v = dist(urbg);
+ }
+ }
+ EXPECT_EQ(12, urbg.invocations());
+ EXPECT_THAT(output, testing::ElementsAre(9648, 8562, 7439, 4089, 3571, 1602,
+ 3813, 9195, 6641, 2986, 7956, 3765));
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/random/uniform_real_distribution.h b/third_party/abseil/src/absl/random/uniform_real_distribution.h
new file mode 100644
index 0000000..5ba17b2
--- /dev/null
+++ b/third_party/abseil/src/absl/random/uniform_real_distribution.h
@@ -0,0 +1,202 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: uniform_real_distribution.h
+// -----------------------------------------------------------------------------
+//
+// This header defines a class for representing a uniform floating-point
+// distribution over a half-open interval [a,b). You use this distribution in
+// combination with an Abseil random bit generator to produce random values
+// according to the rules of the distribution.
+//
+// `absl::uniform_real_distribution` is a drop-in replacement for the C++11
+// `std::uniform_real_distribution` [rand.dist.uni.real] but is considerably
+// faster than the libstdc++ implementation.
+//
+// Note: the standard-library version may occasionally return `1.0` when
+// default-initialized. See https://bugs.llvm.org//show_bug.cgi?id=18767
+// `absl::uniform_real_distribution` does not exhibit this behavior.
+
+#ifndef ABSL_RANDOM_UNIFORM_REAL_DISTRIBUTION_H_
+#define ABSL_RANDOM_UNIFORM_REAL_DISTRIBUTION_H_
+
+#include <cassert>
+#include <cmath>
+#include <cstdint>
+#include <istream>
+#include <limits>
+#include <type_traits>
+
+#include "absl/meta/type_traits.h"
+#include "absl/random/internal/fast_uniform_bits.h"
+#include "absl/random/internal/generate_real.h"
+#include "absl/random/internal/iostream_state_saver.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+// absl::uniform_real_distribution<T>
+//
+// This distribution produces random floating-point values uniformly distributed
+// over the half-open interval [a, b).
+//
+// Example:
+//
+// absl::BitGen gen;
+//
+// // Use the distribution to produce a value between 0.0 (inclusive)
+// // and 1.0 (exclusive).
+// double value = absl::uniform_real_distribution<double>(0, 1)(gen);
+//
+template <typename RealType = double>
+class uniform_real_distribution {
+ public:
+ using result_type = RealType;
+
+ class param_type {
+ public:
+ using distribution_type = uniform_real_distribution;
+
+ explicit param_type(result_type lo = 0, result_type hi = 1)
+ : lo_(lo), hi_(hi), range_(hi - lo) {
+ // [rand.dist.uni.real] preconditions 2 & 3
+ assert(lo <= hi);
+ // NOTE: For integral types, we can promote the range to an unsigned type,
+ // which gives full width of the range. However for real (fp) types, this
+ // is not possible, so value generation cannot use the full range of the
+ // real type.
+ assert(range_ <= (std::numeric_limits<result_type>::max)());
+ assert(std::isfinite(range_));
+ }
+
+ result_type a() const { return lo_; }
+ result_type b() const { return hi_; }
+
+ friend bool operator==(const param_type& a, const param_type& b) {
+ return a.lo_ == b.lo_ && a.hi_ == b.hi_;
+ }
+
+ friend bool operator!=(const param_type& a, const param_type& b) {
+ return !(a == b);
+ }
+
+ private:
+ friend class uniform_real_distribution;
+ result_type lo_, hi_, range_;
+
+ static_assert(std::is_floating_point<RealType>::value,
+ "Class-template absl::uniform_real_distribution<> must be "
+ "parameterized using a floating-point type.");
+ };
+
+ uniform_real_distribution() : uniform_real_distribution(0) {}
+
+ explicit uniform_real_distribution(result_type lo, result_type hi = 1)
+ : param_(lo, hi) {}
+
+ explicit uniform_real_distribution(const param_type& param) : param_(param) {}
+
+ // uniform_real_distribution<T>::reset()
+ //
+ // Resets the uniform real distribution. Note that this function has no effect
+ // because the distribution already produces independent values.
+ void reset() {}
+
+ template <typename URBG>
+ result_type operator()(URBG& gen) { // NOLINT(runtime/references)
+ return operator()(gen, param_);
+ }
+
+ template <typename URBG>
+ result_type operator()(URBG& gen, // NOLINT(runtime/references)
+ const param_type& p);
+
+ result_type a() const { return param_.a(); }
+ result_type b() const { return param_.b(); }
+
+ param_type param() const { return param_; }
+ void param(const param_type& params) { param_ = params; }
+
+ result_type(min)() const { return a(); }
+ result_type(max)() const { return b(); }
+
+ friend bool operator==(const uniform_real_distribution& a,
+ const uniform_real_distribution& b) {
+ return a.param_ == b.param_;
+ }
+ friend bool operator!=(const uniform_real_distribution& a,
+ const uniform_real_distribution& b) {
+ return a.param_ != b.param_;
+ }
+
+ private:
+ param_type param_;
+ random_internal::FastUniformBits<uint64_t> fast_u64_;
+};
+
+// -----------------------------------------------------------------------------
+// Implementation details follow
+// -----------------------------------------------------------------------------
+template <typename RealType>
+template <typename URBG>
+typename uniform_real_distribution<RealType>::result_type
+uniform_real_distribution<RealType>::operator()(
+ URBG& gen, const param_type& p) { // NOLINT(runtime/references)
+ using random_internal::GeneratePositiveTag;
+ using random_internal::GenerateRealFromBits;
+ using real_type =
+ absl::conditional_t<std::is_same<RealType, float>::value, float, double>;
+
+ while (true) {
+ const result_type sample =
+ GenerateRealFromBits<real_type, GeneratePositiveTag, true>(
+ fast_u64_(gen));
+ const result_type res = p.a() + (sample * p.range_);
+ if (res < p.b() || p.range_ <= 0 || !std::isfinite(p.range_)) {
+ return res;
+ }
+ // else sample rejected, try again.
+ }
+}
+
+template <typename CharT, typename Traits, typename RealType>
+std::basic_ostream<CharT, Traits>& operator<<(
+ std::basic_ostream<CharT, Traits>& os, // NOLINT(runtime/references)
+ const uniform_real_distribution<RealType>& x) {
+ auto saver = random_internal::make_ostream_state_saver(os);
+ os.precision(random_internal::stream_precision_helper<RealType>::kPrecision);
+ os << x.a() << os.fill() << x.b();
+ return os;
+}
+
+template <typename CharT, typename Traits, typename RealType>
+std::basic_istream<CharT, Traits>& operator>>(
+ std::basic_istream<CharT, Traits>& is, // NOLINT(runtime/references)
+ uniform_real_distribution<RealType>& x) { // NOLINT(runtime/references)
+ using param_type = typename uniform_real_distribution<RealType>::param_type;
+ using result_type = typename uniform_real_distribution<RealType>::result_type;
+ auto saver = random_internal::make_istream_state_saver(is);
+ auto a = random_internal::read_floating_point<result_type>(is);
+ if (is.fail()) return is;
+ auto b = random_internal::read_floating_point<result_type>(is);
+ if (!is.fail()) {
+ x.param(param_type(a, b));
+ }
+ return is;
+}
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_RANDOM_UNIFORM_REAL_DISTRIBUTION_H_
diff --git a/third_party/abseil/src/absl/random/uniform_real_distribution_test.cc b/third_party/abseil/src/absl/random/uniform_real_distribution_test.cc
new file mode 100644
index 0000000..be107cd
--- /dev/null
+++ b/third_party/abseil/src/absl/random/uniform_real_distribution_test.cc
@@ -0,0 +1,343 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/random/uniform_real_distribution.h"
+
+#include <cmath>
+#include <cstdint>
+#include <iterator>
+#include <random>
+#include <sstream>
+#include <string>
+#include <vector>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/base/internal/raw_logging.h"
+#include "absl/random/internal/chi_square.h"
+#include "absl/random/internal/distribution_test_util.h"
+#include "absl/random/internal/pcg_engine.h"
+#include "absl/random/internal/sequence_urbg.h"
+#include "absl/random/random.h"
+#include "absl/strings/str_cat.h"
+
+// NOTES:
+// * Some documentation on generating random real values suggests that
+// it is possible to use std::nextafter(b, DBL_MAX) to generate a value on
+// the closed range [a, b]. Unfortunately, that technique is not universally
+// reliable due to floating point quantization.
+//
+// * absl::uniform_real_distribution<float> generates between 2^28 and 2^29
+// distinct floating point values in the range [0, 1).
+//
+// * absl::uniform_real_distribution<float> generates at least 2^23 distinct
+// floating point values in the range [1, 2). This should be the same as
+// any other range covered by a single exponent in IEEE 754.
+//
+// * absl::uniform_real_distribution<double> generates more than 2^52 distinct
+// values in the range [0, 1), and should generate at least 2^52 distinct
+// values in the range of [1, 2).
+//
+
+namespace {
+
+template <typename RealType>
+class UniformRealDistributionTest : public ::testing::Test {};
+
+#if defined(__EMSCRIPTEN__)
+using RealTypes = ::testing::Types<float, double>;
+#else
+using RealTypes = ::testing::Types<float, double, long double>;
+#endif // defined(__EMSCRIPTEN__)
+
+TYPED_TEST_SUITE(UniformRealDistributionTest, RealTypes);
+
+TYPED_TEST(UniformRealDistributionTest, ParamSerializeTest) {
+ using param_type =
+ typename absl::uniform_real_distribution<TypeParam>::param_type;
+
+ constexpr const TypeParam a{1152921504606846976};
+
+ constexpr int kCount = 1000;
+ absl::InsecureBitGen gen;
+ for (const auto& param : {
+ param_type(),
+ param_type(TypeParam(2.0), TypeParam(2.0)), // Same
+ param_type(TypeParam(-0.1), TypeParam(0.1)),
+ param_type(TypeParam(0.05), TypeParam(0.12)),
+ param_type(TypeParam(-0.05), TypeParam(0.13)),
+ param_type(TypeParam(-0.05), TypeParam(-0.02)),
+ // double range = 0
+ // 2^60 , 2^60 + 2^6
+ param_type(a, TypeParam(1152921504606847040)),
+ // 2^60 , 2^60 + 2^7
+ param_type(a, TypeParam(1152921504606847104)),
+ // double range = 2^8
+ // 2^60 , 2^60 + 2^8
+ param_type(a, TypeParam(1152921504606847232)),
+ // float range = 0
+ // 2^60 , 2^60 + 2^36
+ param_type(a, TypeParam(1152921573326323712)),
+ // 2^60 , 2^60 + 2^37
+ param_type(a, TypeParam(1152921642045800448)),
+ // float range = 2^38
+ // 2^60 , 2^60 + 2^38
+ param_type(a, TypeParam(1152921779484753920)),
+ // Limits
+ param_type(0, std::numeric_limits<TypeParam>::max()),
+ param_type(std::numeric_limits<TypeParam>::lowest(), 0),
+ param_type(0, std::numeric_limits<TypeParam>::epsilon()),
+ param_type(-std::numeric_limits<TypeParam>::epsilon(),
+ std::numeric_limits<TypeParam>::epsilon()),
+ param_type(std::numeric_limits<TypeParam>::epsilon(),
+ 2 * std::numeric_limits<TypeParam>::epsilon()),
+ }) {
+ // Validate parameters.
+ const auto a = param.a();
+ const auto b = param.b();
+ absl::uniform_real_distribution<TypeParam> before(a, b);
+ EXPECT_EQ(before.a(), param.a());
+ EXPECT_EQ(before.b(), param.b());
+
+ {
+ absl::uniform_real_distribution<TypeParam> via_param(param);
+ EXPECT_EQ(via_param, before);
+ }
+
+ std::stringstream ss;
+ ss << before;
+ absl::uniform_real_distribution<TypeParam> after(TypeParam(1.0),
+ TypeParam(3.1));
+
+ EXPECT_NE(before.a(), after.a());
+ EXPECT_NE(before.b(), after.b());
+ EXPECT_NE(before.param(), after.param());
+ EXPECT_NE(before, after);
+
+ ss >> after;
+
+ EXPECT_EQ(before.a(), after.a());
+ EXPECT_EQ(before.b(), after.b());
+ EXPECT_EQ(before.param(), after.param());
+ EXPECT_EQ(before, after);
+
+ // Smoke test.
+ auto sample_min = after.max();
+ auto sample_max = after.min();
+ for (int i = 0; i < kCount; i++) {
+ auto sample = after(gen);
+ // Failure here indicates a bug in uniform_real_distribution::operator(),
+ // or bad parameters--range too large, etc.
+ if (after.min() == after.max()) {
+ EXPECT_EQ(sample, after.min());
+ } else {
+ EXPECT_GE(sample, after.min());
+ EXPECT_LT(sample, after.max());
+ }
+ if (sample > sample_max) {
+ sample_max = sample;
+ }
+ if (sample < sample_min) {
+ sample_min = sample;
+ }
+ }
+
+ if (!std::is_same<TypeParam, long double>::value) {
+ // static_cast<double>(long double) can overflow.
+ std::string msg = absl::StrCat("Range: ", static_cast<double>(sample_min),
+ ", ", static_cast<double>(sample_max));
+ ABSL_RAW_LOG(INFO, "%s", msg.c_str());
+ }
+ }
+}
+
+#ifdef _MSC_VER
+#pragma warning(push)
+#pragma warning(disable:4756) // Constant arithmetic overflow.
+#endif
+TYPED_TEST(UniformRealDistributionTest, ViolatesPreconditionsDeathTest) {
+#if GTEST_HAS_DEATH_TEST
+ // Hi < Lo
+ EXPECT_DEBUG_DEATH(
+ { absl::uniform_real_distribution<TypeParam> dist(10.0, 1.0); }, "");
+
+ // Hi - Lo > numeric_limits<>::max()
+ EXPECT_DEBUG_DEATH(
+ {
+ absl::uniform_real_distribution<TypeParam> dist(
+ std::numeric_limits<TypeParam>::lowest(),
+ std::numeric_limits<TypeParam>::max());
+ },
+ "");
+#endif // GTEST_HAS_DEATH_TEST
+#if defined(NDEBUG)
+ // opt-mode, for invalid parameters, will generate a garbage value,
+ // but should not enter an infinite loop.
+ absl::InsecureBitGen gen;
+ {
+ absl::uniform_real_distribution<TypeParam> dist(10.0, 1.0);
+ auto x = dist(gen);
+ EXPECT_FALSE(std::isnan(x)) << x;
+ }
+ {
+ absl::uniform_real_distribution<TypeParam> dist(
+ std::numeric_limits<TypeParam>::lowest(),
+ std::numeric_limits<TypeParam>::max());
+ auto x = dist(gen);
+ // Infinite result.
+ EXPECT_FALSE(std::isfinite(x)) << x;
+ }
+#endif // NDEBUG
+}
+#ifdef _MSC_VER
+#pragma warning(pop) // warning(disable:4756)
+#endif
+
+TYPED_TEST(UniformRealDistributionTest, TestMoments) {
+ constexpr int kSize = 1000000;
+ std::vector<double> values(kSize);
+
+ // We use a fixed bit generator for distribution accuracy tests. This allows
+ // these tests to be deterministic, while still testing the qualify of the
+ // implementation.
+ absl::random_internal::pcg64_2018_engine rng{0x2B7E151628AED2A6};
+
+ absl::uniform_real_distribution<TypeParam> dist;
+ for (int i = 0; i < kSize; i++) {
+ values[i] = dist(rng);
+ }
+
+ const auto moments =
+ absl::random_internal::ComputeDistributionMoments(values);
+ EXPECT_NEAR(0.5, moments.mean, 0.01);
+ EXPECT_NEAR(1 / 12.0, moments.variance, 0.015);
+ EXPECT_NEAR(0.0, moments.skewness, 0.02);
+ EXPECT_NEAR(9 / 5.0, moments.kurtosis, 0.015);
+}
+
+TYPED_TEST(UniformRealDistributionTest, ChiSquaredTest50) {
+ using absl::random_internal::kChiSquared;
+ using param_type =
+ typename absl::uniform_real_distribution<TypeParam>::param_type;
+
+ constexpr size_t kTrials = 100000;
+ constexpr int kBuckets = 50;
+ constexpr double kExpected =
+ static_cast<double>(kTrials) / static_cast<double>(kBuckets);
+
+ // 1-in-100000 threshold, but remember, there are about 8 tests
+ // in this file. And the test could fail for other reasons.
+ // Empirically validated with --runs_per_test=10000.
+ const int kThreshold =
+ absl::random_internal::ChiSquareValue(kBuckets - 1, 0.999999);
+
+ // We use a fixed bit generator for distribution accuracy tests. This allows
+ // these tests to be deterministic, while still testing the qualify of the
+ // implementation.
+ absl::random_internal::pcg64_2018_engine rng{0x2B7E151628AED2A6};
+
+ for (const auto& param : {param_type(0, 1), param_type(5, 12),
+ param_type(-5, 13), param_type(-5, -2)}) {
+ const double min_val = param.a();
+ const double max_val = param.b();
+ const double factor = kBuckets / (max_val - min_val);
+
+ std::vector<int32_t> counts(kBuckets, 0);
+ absl::uniform_real_distribution<TypeParam> dist(param);
+ for (size_t i = 0; i < kTrials; i++) {
+ auto x = dist(rng);
+ auto bucket = static_cast<size_t>((x - min_val) * factor);
+ counts[bucket]++;
+ }
+
+ double chi_square = absl::random_internal::ChiSquareWithExpected(
+ std::begin(counts), std::end(counts), kExpected);
+ if (chi_square > kThreshold) {
+ double p_value =
+ absl::random_internal::ChiSquarePValue(chi_square, kBuckets);
+
+ // Chi-squared test failed. Output does not appear to be uniform.
+ std::string msg;
+ for (const auto& a : counts) {
+ absl::StrAppend(&msg, a, "\n");
+ }
+ absl::StrAppend(&msg, kChiSquared, " p-value ", p_value, "\n");
+ absl::StrAppend(&msg, "High ", kChiSquared, " value: ", chi_square, " > ",
+ kThreshold);
+ ABSL_RAW_LOG(INFO, "%s", msg.c_str());
+ FAIL() << msg;
+ }
+ }
+}
+
+TYPED_TEST(UniformRealDistributionTest, StabilityTest) {
+ // absl::uniform_real_distribution stability relies only on
+ // random_internal::RandU64ToDouble and random_internal::RandU64ToFloat.
+ absl::random_internal::sequence_urbg urbg(
+ {0x0003eb76f6f7f755ull, 0xFFCEA50FDB2F953Bull, 0xC332DDEFBE6C5AA5ull,
+ 0x6558218568AB9702ull, 0x2AEF7DAD5B6E2F84ull, 0x1521B62829076170ull,
+ 0xECDD4775619F1510ull, 0x13CCA830EB61BD96ull, 0x0334FE1EAA0363CFull,
+ 0xB5735C904C70A239ull, 0xD59E9E0BCBAADE14ull, 0xEECC86BC60622CA7ull});
+
+ std::vector<int> output(12);
+
+ absl::uniform_real_distribution<TypeParam> dist;
+ std::generate(std::begin(output), std::end(output), [&] {
+ return static_cast<int>(TypeParam(1000000) * dist(urbg));
+ });
+
+ EXPECT_THAT(
+ output, //
+ testing::ElementsAre(59, 999246, 762494, 395876, 167716, 82545, 925251,
+ 77341, 12527, 708791, 834451, 932808));
+}
+
+TEST(UniformRealDistributionTest, AlgorithmBounds) {
+ absl::uniform_real_distribution<double> dist;
+
+ {
+ // This returns the smallest value >0 from absl::uniform_real_distribution.
+ absl::random_internal::sequence_urbg urbg({0x0000000000000001ull});
+ double a = dist(urbg);
+ EXPECT_EQ(a, 5.42101086242752217004e-20);
+ }
+
+ {
+ // This returns a value very near 0.5 from absl::uniform_real_distribution.
+ absl::random_internal::sequence_urbg urbg({0x7fffffffffffffefull});
+ double a = dist(urbg);
+ EXPECT_EQ(a, 0.499999999999999944489);
+ }
+ {
+ // This returns a value very near 0.5 from absl::uniform_real_distribution.
+ absl::random_internal::sequence_urbg urbg({0x8000000000000000ull});
+ double a = dist(urbg);
+ EXPECT_EQ(a, 0.5);
+ }
+
+ {
+ // This returns the largest value <1 from absl::uniform_real_distribution.
+ absl::random_internal::sequence_urbg urbg({0xFFFFFFFFFFFFFFEFull});
+ double a = dist(urbg);
+ EXPECT_EQ(a, 0.999999999999999888978);
+ }
+ {
+ // This *ALSO* returns the largest value <1.
+ absl::random_internal::sequence_urbg urbg({0xFFFFFFFFFFFFFFFFull});
+ double a = dist(urbg);
+ EXPECT_EQ(a, 0.999999999999999888978);
+ }
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/random/zipf_distribution.h b/third_party/abseil/src/absl/random/zipf_distribution.h
new file mode 100644
index 0000000..22ebc75
--- /dev/null
+++ b/third_party/abseil/src/absl/random/zipf_distribution.h
@@ -0,0 +1,271 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_RANDOM_ZIPF_DISTRIBUTION_H_
+#define ABSL_RANDOM_ZIPF_DISTRIBUTION_H_
+
+#include <cassert>
+#include <cmath>
+#include <istream>
+#include <limits>
+#include <ostream>
+#include <type_traits>
+
+#include "absl/random/internal/iostream_state_saver.h"
+#include "absl/random/uniform_real_distribution.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+// absl::zipf_distribution produces random integer-values in the range [0, k],
+// distributed according to the discrete probability function:
+//
+// P(x) = (v + x) ^ -q
+//
+// The parameter `v` must be greater than 0 and the parameter `q` must be
+// greater than 1. If either of these parameters take invalid values then the
+// behavior is undefined.
+//
+// IntType is the result_type generated by the generator. It must be of integral
+// type; a static_assert ensures this is the case.
+//
+// The implementation is based on W.Hormann, G.Derflinger:
+//
+// "Rejection-Inversion to Generate Variates from Monotone Discrete
+// Distributions"
+//
+// http://eeyore.wu-wien.ac.at/papers/96-04-04.wh-der.ps.gz
+//
+template <typename IntType = int>
+class zipf_distribution {
+ public:
+ using result_type = IntType;
+
+ class param_type {
+ public:
+ using distribution_type = zipf_distribution;
+
+ // Preconditions: k > 0, v > 0, q > 1
+ // The precondidtions are validated when NDEBUG is not defined via
+ // a pair of assert() directives.
+ // If NDEBUG is defined and either or both of these parameters take invalid
+ // values, the behavior of the class is undefined.
+ explicit param_type(result_type k = (std::numeric_limits<IntType>::max)(),
+ double q = 2.0, double v = 1.0);
+
+ result_type k() const { return k_; }
+ double q() const { return q_; }
+ double v() const { return v_; }
+
+ friend bool operator==(const param_type& a, const param_type& b) {
+ return a.k_ == b.k_ && a.q_ == b.q_ && a.v_ == b.v_;
+ }
+ friend bool operator!=(const param_type& a, const param_type& b) {
+ return !(a == b);
+ }
+
+ private:
+ friend class zipf_distribution;
+ inline double h(double x) const;
+ inline double hinv(double x) const;
+ inline double compute_s() const;
+ inline double pow_negative_q(double x) const;
+
+ // Parameters here are exactly the same as the parameters of Algorithm ZRI
+ // in the paper.
+ IntType k_;
+ double q_;
+ double v_;
+
+ double one_minus_q_; // 1-q
+ double s_;
+ double one_minus_q_inv_; // 1 / 1-q
+ double hxm_; // h(k + 0.5)
+ double hx0_minus_hxm_; // h(x0) - h(k + 0.5)
+
+ static_assert(std::is_integral<IntType>::value,
+ "Class-template absl::zipf_distribution<> must be "
+ "parameterized using an integral type.");
+ };
+
+ zipf_distribution()
+ : zipf_distribution((std::numeric_limits<IntType>::max)()) {}
+
+ explicit zipf_distribution(result_type k, double q = 2.0, double v = 1.0)
+ : param_(k, q, v) {}
+
+ explicit zipf_distribution(const param_type& p) : param_(p) {}
+
+ void reset() {}
+
+ template <typename URBG>
+ result_type operator()(URBG& g) { // NOLINT(runtime/references)
+ return (*this)(g, param_);
+ }
+
+ template <typename URBG>
+ result_type operator()(URBG& g, // NOLINT(runtime/references)
+ const param_type& p);
+
+ result_type k() const { return param_.k(); }
+ double q() const { return param_.q(); }
+ double v() const { return param_.v(); }
+
+ param_type param() const { return param_; }
+ void param(const param_type& p) { param_ = p; }
+
+ result_type(min)() const { return 0; }
+ result_type(max)() const { return k(); }
+
+ friend bool operator==(const zipf_distribution& a,
+ const zipf_distribution& b) {
+ return a.param_ == b.param_;
+ }
+ friend bool operator!=(const zipf_distribution& a,
+ const zipf_distribution& b) {
+ return a.param_ != b.param_;
+ }
+
+ private:
+ param_type param_;
+};
+
+// --------------------------------------------------------------------------
+// Implementation details follow
+// --------------------------------------------------------------------------
+
+template <typename IntType>
+zipf_distribution<IntType>::param_type::param_type(
+ typename zipf_distribution<IntType>::result_type k, double q, double v)
+ : k_(k), q_(q), v_(v), one_minus_q_(1 - q) {
+ assert(q > 1);
+ assert(v > 0);
+ assert(k > 0);
+ one_minus_q_inv_ = 1 / one_minus_q_;
+
+ // Setup for the ZRI algorithm (pg 17 of the paper).
+ // Compute: h(i max) => h(k + 0.5)
+ constexpr double kMax = 18446744073709549568.0;
+ double kd = static_cast<double>(k);
+ // TODO(absl-team): Determine if this check is needed, and if so, add a test
+ // that fails for k > kMax
+ if (kd > kMax) {
+ // Ensure that our maximum value is capped to a value which will
+ // round-trip back through double.
+ kd = kMax;
+ }
+ hxm_ = h(kd + 0.5);
+
+ // Compute: h(0)
+ const bool use_precomputed = (v == 1.0 && q == 2.0);
+ const double h0x5 = use_precomputed ? (-1.0 / 1.5) // exp(-log(1.5))
+ : h(0.5);
+ const double elogv_q = (v_ == 1.0) ? 1 : pow_negative_q(v_);
+
+ // h(0) = h(0.5) - exp(log(v) * -q)
+ hx0_minus_hxm_ = (h0x5 - elogv_q) - hxm_;
+
+ // And s
+ s_ = use_precomputed ? 0.46153846153846123 : compute_s();
+}
+
+template <typename IntType>
+double zipf_distribution<IntType>::param_type::h(double x) const {
+ // std::exp(one_minus_q_ * std::log(v_ + x)) * one_minus_q_inv_;
+ x += v_;
+ return (one_minus_q_ == -1.0)
+ ? (-1.0 / x) // -exp(-log(x))
+ : (std::exp(std::log(x) * one_minus_q_) * one_minus_q_inv_);
+}
+
+template <typename IntType>
+double zipf_distribution<IntType>::param_type::hinv(double x) const {
+ // std::exp(one_minus_q_inv_ * std::log(one_minus_q_ * x)) - v_;
+ return -v_ + ((one_minus_q_ == -1.0)
+ ? (-1.0 / x) // exp(-log(-x))
+ : std::exp(one_minus_q_inv_ * std::log(one_minus_q_ * x)));
+}
+
+template <typename IntType>
+double zipf_distribution<IntType>::param_type::compute_s() const {
+ // 1 - hinv(h(1.5) - std::exp(std::log(v_ + 1) * -q_));
+ return 1.0 - hinv(h(1.5) - pow_negative_q(v_ + 1.0));
+}
+
+template <typename IntType>
+double zipf_distribution<IntType>::param_type::pow_negative_q(double x) const {
+ // std::exp(std::log(x) * -q_);
+ return q_ == 2.0 ? (1.0 / (x * x)) : std::exp(std::log(x) * -q_);
+}
+
+template <typename IntType>
+template <typename URBG>
+typename zipf_distribution<IntType>::result_type
+zipf_distribution<IntType>::operator()(
+ URBG& g, const param_type& p) { // NOLINT(runtime/references)
+ absl::uniform_real_distribution<double> uniform_double;
+ double k;
+ for (;;) {
+ const double v = uniform_double(g);
+ const double u = p.hxm_ + v * p.hx0_minus_hxm_;
+ const double x = p.hinv(u);
+ k = rint(x); // std::floor(x + 0.5);
+ if (k > p.k()) continue; // reject k > max_k
+ if (k - x <= p.s_) break;
+ const double h = p.h(k + 0.5);
+ const double r = p.pow_negative_q(p.v_ + k);
+ if (u >= h - r) break;
+ }
+ IntType ki = static_cast<IntType>(k);
+ assert(ki <= p.k_);
+ return ki;
+}
+
+template <typename CharT, typename Traits, typename IntType>
+std::basic_ostream<CharT, Traits>& operator<<(
+ std::basic_ostream<CharT, Traits>& os, // NOLINT(runtime/references)
+ const zipf_distribution<IntType>& x) {
+ using stream_type =
+ typename random_internal::stream_format_type<IntType>::type;
+ auto saver = random_internal::make_ostream_state_saver(os);
+ os.precision(random_internal::stream_precision_helper<double>::kPrecision);
+ os << static_cast<stream_type>(x.k()) << os.fill() << x.q() << os.fill()
+ << x.v();
+ return os;
+}
+
+template <typename CharT, typename Traits, typename IntType>
+std::basic_istream<CharT, Traits>& operator>>(
+ std::basic_istream<CharT, Traits>& is, // NOLINT(runtime/references)
+ zipf_distribution<IntType>& x) { // NOLINT(runtime/references)
+ using result_type = typename zipf_distribution<IntType>::result_type;
+ using param_type = typename zipf_distribution<IntType>::param_type;
+ using stream_type =
+ typename random_internal::stream_format_type<IntType>::type;
+ stream_type k;
+ double q;
+ double v;
+
+ auto saver = random_internal::make_istream_state_saver(is);
+ is >> k >> q >> v;
+ if (!is.fail()) {
+ x.param(param_type(static_cast<result_type>(k), q, v));
+ }
+ return is;
+}
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_RANDOM_ZIPF_DISTRIBUTION_H_
diff --git a/third_party/abseil/src/absl/random/zipf_distribution_test.cc b/third_party/abseil/src/absl/random/zipf_distribution_test.cc
new file mode 100644
index 0000000..f8cf70e
--- /dev/null
+++ b/third_party/abseil/src/absl/random/zipf_distribution_test.cc
@@ -0,0 +1,427 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/random/zipf_distribution.h"
+
+#include <algorithm>
+#include <cstddef>
+#include <cstdint>
+#include <iterator>
+#include <random>
+#include <string>
+#include <utility>
+#include <vector>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/base/internal/raw_logging.h"
+#include "absl/random/internal/chi_square.h"
+#include "absl/random/internal/pcg_engine.h"
+#include "absl/random/internal/sequence_urbg.h"
+#include "absl/random/random.h"
+#include "absl/strings/str_cat.h"
+#include "absl/strings/str_replace.h"
+#include "absl/strings/strip.h"
+
+namespace {
+
+using ::absl::random_internal::kChiSquared;
+using ::testing::ElementsAre;
+
+template <typename IntType>
+class ZipfDistributionTypedTest : public ::testing::Test {};
+
+using IntTypes = ::testing::Types<int, int8_t, int16_t, int32_t, int64_t,
+ uint8_t, uint16_t, uint32_t, uint64_t>;
+TYPED_TEST_CASE(ZipfDistributionTypedTest, IntTypes);
+
+TYPED_TEST(ZipfDistributionTypedTest, SerializeTest) {
+ using param_type = typename absl::zipf_distribution<TypeParam>::param_type;
+
+ constexpr int kCount = 1000;
+ absl::InsecureBitGen gen;
+ for (const auto& param : {
+ param_type(),
+ param_type(32),
+ param_type(100, 3, 2),
+ param_type(std::numeric_limits<TypeParam>::max(), 4, 3),
+ param_type(std::numeric_limits<TypeParam>::max() / 2),
+ }) {
+ // Validate parameters.
+ const auto k = param.k();
+ const auto q = param.q();
+ const auto v = param.v();
+
+ absl::zipf_distribution<TypeParam> before(k, q, v);
+ EXPECT_EQ(before.k(), param.k());
+ EXPECT_EQ(before.q(), param.q());
+ EXPECT_EQ(before.v(), param.v());
+
+ {
+ absl::zipf_distribution<TypeParam> via_param(param);
+ EXPECT_EQ(via_param, before);
+ }
+
+ // Validate stream serialization.
+ std::stringstream ss;
+ ss << before;
+ absl::zipf_distribution<TypeParam> after(4, 5.5, 4.4);
+
+ EXPECT_NE(before.k(), after.k());
+ EXPECT_NE(before.q(), after.q());
+ EXPECT_NE(before.v(), after.v());
+ EXPECT_NE(before.param(), after.param());
+ EXPECT_NE(before, after);
+
+ ss >> after;
+
+ EXPECT_EQ(before.k(), after.k());
+ EXPECT_EQ(before.q(), after.q());
+ EXPECT_EQ(before.v(), after.v());
+ EXPECT_EQ(before.param(), after.param());
+ EXPECT_EQ(before, after);
+
+ // Smoke test.
+ auto sample_min = after.max();
+ auto sample_max = after.min();
+ for (int i = 0; i < kCount; i++) {
+ auto sample = after(gen);
+ EXPECT_GE(sample, after.min());
+ EXPECT_LE(sample, after.max());
+ if (sample > sample_max) sample_max = sample;
+ if (sample < sample_min) sample_min = sample;
+ }
+ ABSL_INTERNAL_LOG(INFO,
+ absl::StrCat("Range: ", +sample_min, ", ", +sample_max));
+ }
+}
+
+class ZipfModel {
+ public:
+ ZipfModel(size_t k, double q, double v) : k_(k), q_(q), v_(v) {}
+
+ double mean() const { return mean_; }
+
+ // For the other moments of the Zipf distribution, see, for example,
+ // http://mathworld.wolfram.com/ZipfDistribution.html
+
+ // PMF(k) = (1 / k^s) / H(N,s)
+ // Returns the probability that any single invocation returns k.
+ double PMF(size_t i) { return i >= hnq_.size() ? 0.0 : hnq_[i] / sum_hnq_; }
+
+ // CDF = H(k, s) / H(N,s)
+ double CDF(size_t i) {
+ if (i >= hnq_.size()) {
+ return 1.0;
+ }
+ auto it = std::begin(hnq_);
+ double h = 0.0;
+ for (const auto end = it; it != end; it++) {
+ h += *it;
+ }
+ return h / sum_hnq_;
+ }
+
+ // The InverseCDF returns the k values which bound p on the upper and lower
+ // bound. Since there is no closed-form solution, this is implemented as a
+ // bisction of the cdf.
+ std::pair<size_t, size_t> InverseCDF(double p) {
+ size_t min = 0;
+ size_t max = hnq_.size();
+ while (max > min + 1) {
+ size_t target = (max + min) >> 1;
+ double x = CDF(target);
+ if (x > p) {
+ max = target;
+ } else {
+ min = target;
+ }
+ }
+ return {min, max};
+ }
+
+ // Compute the probability totals, which are based on the generalized harmonic
+ // number, H(N,s).
+ // H(N,s) == SUM(k=1..N, 1 / k^s)
+ //
+ // In the limit, H(N,s) == zetac(s) + 1.
+ //
+ // NOTE: The mean of a zipf distribution could be computed here as well.
+ // Mean := H(N, s-1) / H(N,s).
+ // Given the parameter v = 1, this gives the following function:
+ // (Hn(100, 1) - Hn(1,1)) / (Hn(100,2) - Hn(1,2)) = 6.5944
+ //
+ void Init() {
+ if (!hnq_.empty()) {
+ return;
+ }
+ hnq_.clear();
+ hnq_.reserve(std::min(k_, size_t{1000}));
+
+ sum_hnq_ = 0;
+ double qm1 = q_ - 1.0;
+ double sum_hnq_m1 = 0;
+ for (size_t i = 0; i < k_; i++) {
+ // Partial n-th generalized harmonic number
+ const double x = v_ + i;
+
+ // H(n, q-1)
+ const double hnqm1 =
+ (q_ == 2.0) ? (1.0 / x)
+ : (q_ == 3.0) ? (1.0 / (x * x)) : std::pow(x, -qm1);
+ sum_hnq_m1 += hnqm1;
+
+ // H(n, q)
+ const double hnq =
+ (q_ == 2.0) ? (1.0 / (x * x))
+ : (q_ == 3.0) ? (1.0 / (x * x * x)) : std::pow(x, -q_);
+ sum_hnq_ += hnq;
+ hnq_.push_back(hnq);
+ if (i > 1000 && hnq <= 1e-10) {
+ // The harmonic number is too small.
+ break;
+ }
+ }
+ assert(sum_hnq_ > 0);
+ mean_ = sum_hnq_m1 / sum_hnq_;
+ }
+
+ private:
+ const size_t k_;
+ const double q_;
+ const double v_;
+
+ double mean_;
+ std::vector<double> hnq_;
+ double sum_hnq_;
+};
+
+using zipf_u64 = absl::zipf_distribution<uint64_t>;
+
+class ZipfTest : public testing::TestWithParam<zipf_u64::param_type>,
+ public ZipfModel {
+ public:
+ ZipfTest() : ZipfModel(GetParam().k(), GetParam().q(), GetParam().v()) {}
+
+ // We use a fixed bit generator for distribution accuracy tests. This allows
+ // these tests to be deterministic, while still testing the qualify of the
+ // implementation.
+ absl::random_internal::pcg64_2018_engine rng_{0x2B7E151628AED2A6};
+};
+
+TEST_P(ZipfTest, ChiSquaredTest) {
+ const auto& param = GetParam();
+ Init();
+
+ size_t trials = 10000;
+
+ // Find the split-points for the buckets.
+ std::vector<size_t> points;
+ std::vector<double> expected;
+ {
+ double last_cdf = 0.0;
+ double min_p = 1.0;
+ for (double p = 0.01; p < 1.0; p += 0.01) {
+ auto x = InverseCDF(p);
+ if (points.empty() || points.back() < x.second) {
+ const double p = CDF(x.second);
+ points.push_back(x.second);
+ double q = p - last_cdf;
+ expected.push_back(q);
+ last_cdf = p;
+ if (q < min_p) {
+ min_p = q;
+ }
+ }
+ }
+ if (last_cdf < 0.999) {
+ points.push_back(std::numeric_limits<size_t>::max());
+ double q = 1.0 - last_cdf;
+ expected.push_back(q);
+ if (q < min_p) {
+ min_p = q;
+ }
+ } else {
+ points.back() = std::numeric_limits<size_t>::max();
+ expected.back() += (1.0 - last_cdf);
+ }
+ // The Chi-Squared score is not completely scale-invariant; it works best
+ // when the small values are in the small digits.
+ trials = static_cast<size_t>(8.0 / min_p);
+ }
+ ASSERT_GT(points.size(), 0);
+
+ // Generate n variates and fill the counts vector with the count of their
+ // occurrences.
+ std::vector<int64_t> buckets(points.size(), 0);
+ double avg = 0;
+ {
+ zipf_u64 dis(param);
+ for (size_t i = 0; i < trials; i++) {
+ uint64_t x = dis(rng_);
+ ASSERT_LE(x, dis.max());
+ ASSERT_GE(x, dis.min());
+ avg += static_cast<double>(x);
+ auto it = std::upper_bound(std::begin(points), std::end(points),
+ static_cast<size_t>(x));
+ buckets[std::distance(std::begin(points), it)]++;
+ }
+ avg = avg / static_cast<double>(trials);
+ }
+
+ // Validate the output using the Chi-Squared test.
+ for (auto& e : expected) {
+ e *= trials;
+ }
+
+ // The null-hypothesis is that the distribution is a poisson distribution with
+ // the provided mean (not estimated from the data).
+ const int dof = static_cast<int>(expected.size()) - 1;
+
+ // NOTE: This test runs about 15x per invocation, so a value of 0.9995 is
+ // approximately correct for a test suite failure rate of 1 in 100. In
+ // practice we see failures slightly higher than that.
+ const double threshold = absl::random_internal::ChiSquareValue(dof, 0.9999);
+
+ const double chi_square = absl::random_internal::ChiSquare(
+ std::begin(buckets), std::end(buckets), std::begin(expected),
+ std::end(expected));
+
+ const double p_actual =
+ absl::random_internal::ChiSquarePValue(chi_square, dof);
+
+ // Log if the chi_squared value is above the threshold.
+ if (chi_square > threshold) {
+ ABSL_INTERNAL_LOG(INFO, "values");
+ for (size_t i = 0; i < expected.size(); i++) {
+ ABSL_INTERNAL_LOG(INFO, absl::StrCat(points[i], ": ", buckets[i],
+ " vs. E=", expected[i]));
+ }
+ ABSL_INTERNAL_LOG(INFO, absl::StrCat("trials ", trials));
+ ABSL_INTERNAL_LOG(INFO,
+ absl::StrCat("mean ", avg, " vs. expected ", mean()));
+ ABSL_INTERNAL_LOG(INFO, absl::StrCat(kChiSquared, "(data, ", dof, ") = ",
+ chi_square, " (", p_actual, ")"));
+ ABSL_INTERNAL_LOG(INFO,
+ absl::StrCat(kChiSquared, " @ 0.9995 = ", threshold));
+ FAIL() << kChiSquared << " value of " << chi_square
+ << " is above the threshold.";
+ }
+}
+
+std::vector<zipf_u64::param_type> GenParams() {
+ using param = zipf_u64::param_type;
+ const auto k = param().k();
+ const auto q = param().q();
+ const auto v = param().v();
+ const uint64_t k2 = 1 << 10;
+ return std::vector<zipf_u64::param_type>{
+ // Default
+ param(k, q, v),
+ // vary K
+ param(4, q, v), param(1 << 4, q, v), param(k2, q, v),
+ // vary V
+ param(k2, q, 0.5), param(k2, q, 1.5), param(k2, q, 2.5), param(k2, q, 10),
+ // vary Q
+ param(k2, 1.5, v), param(k2, 3, v), param(k2, 5, v), param(k2, 10, v),
+ // Vary V & Q
+ param(k2, 1.5, 0.5), param(k2, 3, 1.5), param(k, 10, 10)};
+}
+
+std::string ParamName(
+ const ::testing::TestParamInfo<zipf_u64::param_type>& info) {
+ const auto& p = info.param;
+ std::string name = absl::StrCat("k_", p.k(), "__q_", absl::SixDigits(p.q()),
+ "__v_", absl::SixDigits(p.v()));
+ return absl::StrReplaceAll(name, {{"+", "_"}, {"-", "_"}, {".", "_"}});
+}
+
+INSTANTIATE_TEST_SUITE_P(All, ZipfTest, ::testing::ValuesIn(GenParams()),
+ ParamName);
+
+// NOTE: absl::zipf_distribution is not guaranteed to be stable.
+TEST(ZipfDistributionTest, StabilityTest) {
+ // absl::zipf_distribution stability relies on
+ // absl::uniform_real_distribution, std::log, std::exp, std::log1p
+ absl::random_internal::sequence_urbg urbg(
+ {0x0003eb76f6f7f755ull, 0xFFCEA50FDB2F953Bull, 0xC332DDEFBE6C5AA5ull,
+ 0x6558218568AB9702ull, 0x2AEF7DAD5B6E2F84ull, 0x1521B62829076170ull,
+ 0xECDD4775619F1510ull, 0x13CCA830EB61BD96ull, 0x0334FE1EAA0363CFull,
+ 0xB5735C904C70A239ull, 0xD59E9E0BCBAADE14ull, 0xEECC86BC60622CA7ull});
+
+ std::vector<int> output(10);
+
+ {
+ absl::zipf_distribution<int32_t> dist;
+ std::generate(std::begin(output), std::end(output),
+ [&] { return dist(urbg); });
+ EXPECT_THAT(output, ElementsAre(10031, 0, 0, 3, 6, 0, 7, 47, 0, 0));
+ }
+ urbg.reset();
+ {
+ absl::zipf_distribution<int32_t> dist(std::numeric_limits<int32_t>::max(),
+ 3.3);
+ std::generate(std::begin(output), std::end(output),
+ [&] { return dist(urbg); });
+ EXPECT_THAT(output, ElementsAre(44, 0, 0, 0, 0, 1, 0, 1, 3, 0));
+ }
+}
+
+TEST(ZipfDistributionTest, AlgorithmBounds) {
+ absl::zipf_distribution<int32_t> dist;
+
+ // Small values from absl::uniform_real_distribution map to larger Zipf
+ // distribution values.
+ const std::pair<uint64_t, int32_t> kInputs[] = {
+ {0xffffffffffffffff, 0x0}, {0x7fffffffffffffff, 0x0},
+ {0x3ffffffffffffffb, 0x1}, {0x1ffffffffffffffd, 0x4},
+ {0xffffffffffffffe, 0x9}, {0x7ffffffffffffff, 0x12},
+ {0x3ffffffffffffff, 0x25}, {0x1ffffffffffffff, 0x4c},
+ {0xffffffffffffff, 0x99}, {0x7fffffffffffff, 0x132},
+ {0x3fffffffffffff, 0x265}, {0x1fffffffffffff, 0x4cc},
+ {0xfffffffffffff, 0x999}, {0x7ffffffffffff, 0x1332},
+ {0x3ffffffffffff, 0x2665}, {0x1ffffffffffff, 0x4ccc},
+ {0xffffffffffff, 0x9998}, {0x7fffffffffff, 0x1332f},
+ {0x3fffffffffff, 0x2665a}, {0x1fffffffffff, 0x4cc9e},
+ {0xfffffffffff, 0x998e0}, {0x7ffffffffff, 0x133051},
+ {0x3ffffffffff, 0x265ae4}, {0x1ffffffffff, 0x4c9ed3},
+ {0xffffffffff, 0x98e223}, {0x7fffffffff, 0x13058c4},
+ {0x3fffffffff, 0x25b178e}, {0x1fffffffff, 0x4a062b2},
+ {0xfffffffff, 0x8ee23b8}, {0x7ffffffff, 0x10b21642},
+ {0x3ffffffff, 0x1d89d89d}, {0x1ffffffff, 0x2fffffff},
+ {0xffffffff, 0x45d1745d}, {0x7fffffff, 0x5a5a5a5a},
+ {0x3fffffff, 0x69ee5846}, {0x1fffffff, 0x73ecade3},
+ {0xfffffff, 0x79a9d260}, {0x7ffffff, 0x7cc0532b},
+ {0x3ffffff, 0x7e5ad146}, {0x1ffffff, 0x7f2c0bec},
+ {0xffffff, 0x7f95adef}, {0x7fffff, 0x7fcac0da},
+ {0x3fffff, 0x7fe55ae2}, {0x1fffff, 0x7ff2ac0e},
+ {0xfffff, 0x7ff955ae}, {0x7ffff, 0x7ffcaac1},
+ {0x3ffff, 0x7ffe555b}, {0x1ffff, 0x7fff2aac},
+ {0xffff, 0x7fff9556}, {0x7fff, 0x7fffcaab},
+ {0x3fff, 0x7fffe555}, {0x1fff, 0x7ffff2ab},
+ {0xfff, 0x7ffff955}, {0x7ff, 0x7ffffcab},
+ {0x3ff, 0x7ffffe55}, {0x1ff, 0x7fffff2b},
+ {0xff, 0x7fffff95}, {0x7f, 0x7fffffcb},
+ {0x3f, 0x7fffffe5}, {0x1f, 0x7ffffff3},
+ {0xf, 0x7ffffff9}, {0x7, 0x7ffffffd},
+ {0x3, 0x7ffffffe}, {0x1, 0x7fffffff},
+ };
+
+ for (const auto& instance : kInputs) {
+ absl::random_internal::sequence_urbg urbg({instance.first});
+ EXPECT_EQ(instance.second, dist(urbg));
+ }
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/status/BUILD.bazel b/third_party/abseil/src/absl/status/BUILD.bazel
new file mode 100644
index 0000000..189bd73
--- /dev/null
+++ b/third_party/abseil/src/absl/status/BUILD.bazel
@@ -0,0 +1,103 @@
+#
+# Copyright 2017 The Abseil Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# This package contains `absl::Status`.
+# It will expand later to have utilities around `Status` like `StatusOr`,
+# `StatusBuilder` and macros.
+
+load("@rules_cc//cc:defs.bzl", "cc_library", "cc_test")
+load(
+ "//absl:copts/configure_copts.bzl",
+ "ABSL_DEFAULT_COPTS",
+ "ABSL_TEST_COPTS",
+)
+
+package(default_visibility = ["//visibility:public"])
+
+licenses(["notice"])
+
+cc_library(
+ name = "status",
+ srcs = [
+ "internal/status_internal.h",
+ "status.cc",
+ "status_payload_printer.cc",
+ ],
+ hdrs = [
+ "status.h",
+ "status_payload_printer.h",
+ ],
+ copts = ABSL_DEFAULT_COPTS,
+ deps = [
+ "//absl/base:atomic_hook",
+ "//absl/base:config",
+ "//absl/base:core_headers",
+ "//absl/base:raw_logging_internal",
+ "//absl/container:inlined_vector",
+ "//absl/debugging:stacktrace",
+ "//absl/debugging:symbolize",
+ "//absl/strings",
+ "//absl/strings:cord",
+ "//absl/strings:str_format",
+ "//absl/types:optional",
+ ],
+)
+
+cc_test(
+ name = "status_test",
+ srcs = ["status_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ deps = [
+ ":status",
+ "//absl/strings",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_library(
+ name = "statusor",
+ srcs = [
+ "internal/statusor_internal.h",
+ "statusor.cc",
+ ],
+ hdrs = [
+ "statusor.h",
+ ],
+ copts = ABSL_DEFAULT_COPTS,
+ deps = [
+ ":status",
+ "//absl/base:core_headers",
+ "//absl/base:raw_logging_internal",
+ "//absl/meta:type_traits",
+ "//absl/strings",
+ "//absl/types:variant",
+ "//absl/utility",
+ ],
+)
+
+cc_test(
+ name = "statusor_test",
+ size = "small",
+ srcs = ["statusor_test.cc"],
+ deps = [
+ ":status",
+ ":statusor",
+ "//absl/base",
+ "//absl/memory",
+ "//absl/types:any",
+ "//absl/utility",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
diff --git a/third_party/abseil/src/absl/status/CMakeLists.txt b/third_party/abseil/src/absl/status/CMakeLists.txt
new file mode 100644
index 0000000..f0d798a
--- /dev/null
+++ b/third_party/abseil/src/absl/status/CMakeLists.txt
@@ -0,0 +1,88 @@
+#
+# Copyright 2020 The Abseil Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+absl_cc_library(
+ NAME
+ status
+ HDRS
+ "status.h"
+ SRCS
+ "internal/status_internal.h"
+ "status.cc"
+ "status_payload_printer.h"
+ "status_payload_printer.cc"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::atomic_hook
+ absl::config
+ absl::core_headers
+ absl::raw_logging_internal
+ absl::inlined_vector
+ absl::stacktrace
+ absl::symbolize
+ absl::strings
+ absl::cord
+ absl::str_format
+ absl::optional
+ PUBLIC
+)
+
+absl_cc_test(
+ NAME
+ status_test
+ SRCS
+ "status_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::status
+ absl::strings
+ gmock_main
+)
+
+absl_cc_library(
+ NAME
+ statusor
+ HDRS
+ "statusor.h"
+ SRCS
+ "statusor.cc"
+ "internal/statusor_internal.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::status
+ absl::core_headers
+ absl::raw_logging_internal
+ absl::type_traits
+ absl::strings
+ absl::utility
+ absl::variant
+ PUBLIC
+)
+
+absl_cc_test(
+ NAME
+ statusor_test
+ SRCS
+ "statusor_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::status
+ absl::statusor
+ gmock_main
+)
diff --git a/third_party/abseil/src/absl/status/internal/status_internal.h b/third_party/abseil/src/absl/status/internal/status_internal.h
new file mode 100644
index 0000000..279f8f5
--- /dev/null
+++ b/third_party/abseil/src/absl/status/internal/status_internal.h
@@ -0,0 +1,58 @@
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+#ifndef ABSL_STATUS_INTERNAL_STATUS_INTERNAL_H_
+#define ABSL_STATUS_INTERNAL_STATUS_INTERNAL_H_
+
+#include <string>
+
+#include "absl/container/inlined_vector.h"
+#include "absl/strings/cord.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+enum class StatusCode : int;
+
+namespace status_internal {
+
+// Container for status payloads.
+struct Payload {
+ std::string type_url;
+ absl::Cord payload;
+};
+
+using Payloads = absl::InlinedVector<Payload, 1>;
+
+// Reference-counted representation of Status data.
+struct StatusRep {
+ StatusRep(absl::StatusCode code, std::string message,
+ std::unique_ptr<status_internal::Payloads> payloads)
+ : ref(int32_t{1}),
+ code(code),
+ message(std::move(message)),
+ payloads(std::move(payloads)) {}
+
+ std::atomic<int32_t> ref;
+ absl::StatusCode code;
+ std::string message;
+ std::unique_ptr<status_internal::Payloads> payloads;
+};
+
+absl::StatusCode MapToLocalCode(int value);
+} // namespace status_internal
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_STATUS_INTERNAL_STATUS_INTERNAL_H_
diff --git a/third_party/abseil/src/absl/status/internal/statusor_internal.h b/third_party/abseil/src/absl/status/internal/statusor_internal.h
new file mode 100644
index 0000000..eaac2c0
--- /dev/null
+++ b/third_party/abseil/src/absl/status/internal/statusor_internal.h
@@ -0,0 +1,396 @@
+// Copyright 2020 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+#ifndef ABSL_STATUS_INTERNAL_STATUSOR_INTERNAL_H_
+#define ABSL_STATUS_INTERNAL_STATUSOR_INTERNAL_H_
+
+#include <type_traits>
+#include <utility>
+
+#include "absl/base/attributes.h"
+#include "absl/meta/type_traits.h"
+#include "absl/status/status.h"
+#include "absl/utility/utility.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+template <typename T>
+class ABSL_MUST_USE_RESULT StatusOr;
+
+namespace internal_statusor {
+
+// Detects whether `U` has conversion operator to `StatusOr<T>`, i.e. `operator
+// StatusOr<T>()`.
+template <typename T, typename U, typename = void>
+struct HasConversionOperatorToStatusOr : std::false_type {};
+
+template <typename T, typename U>
+void test(char (*)[sizeof(std::declval<U>().operator absl::StatusOr<T>())]);
+
+template <typename T, typename U>
+struct HasConversionOperatorToStatusOr<T, U, decltype(test<T, U>(0))>
+ : std::true_type {};
+
+// Detects whether `T` is constructible or convertible from `StatusOr<U>`.
+template <typename T, typename U>
+using IsConstructibleOrConvertibleFromStatusOr =
+ absl::disjunction<std::is_constructible<T, StatusOr<U>&>,
+ std::is_constructible<T, const StatusOr<U>&>,
+ std::is_constructible<T, StatusOr<U>&&>,
+ std::is_constructible<T, const StatusOr<U>&&>,
+ std::is_convertible<StatusOr<U>&, T>,
+ std::is_convertible<const StatusOr<U>&, T>,
+ std::is_convertible<StatusOr<U>&&, T>,
+ std::is_convertible<const StatusOr<U>&&, T>>;
+
+// Detects whether `T` is constructible or convertible or assignable from
+// `StatusOr<U>`.
+template <typename T, typename U>
+using IsConstructibleOrConvertibleOrAssignableFromStatusOr =
+ absl::disjunction<IsConstructibleOrConvertibleFromStatusOr<T, U>,
+ std::is_assignable<T&, StatusOr<U>&>,
+ std::is_assignable<T&, const StatusOr<U>&>,
+ std::is_assignable<T&, StatusOr<U>&&>,
+ std::is_assignable<T&, const StatusOr<U>&&>>;
+
+// Detects whether direct initializing `StatusOr<T>` from `U` is ambiguous, i.e.
+// when `U` is `StatusOr<V>` and `T` is constructible or convertible from `V`.
+template <typename T, typename U>
+struct IsDirectInitializationAmbiguous
+ : public absl::conditional_t<
+ std::is_same<absl::remove_cv_t<absl::remove_reference_t<U>>,
+ U>::value,
+ std::false_type,
+ IsDirectInitializationAmbiguous<
+ T, absl::remove_cv_t<absl::remove_reference_t<U>>>> {};
+
+template <typename T, typename V>
+struct IsDirectInitializationAmbiguous<T, absl::StatusOr<V>>
+ : public IsConstructibleOrConvertibleFromStatusOr<T, V> {};
+
+// Checks against the constraints of the direction initialization, i.e. when
+// `StatusOr<T>::StatusOr(U&&)` should participate in overload resolution.
+template <typename T, typename U>
+using IsDirectInitializationValid = absl::disjunction<
+ // Short circuits if T is basically U.
+ std::is_same<T, absl::remove_cv_t<absl::remove_reference_t<U>>>,
+ absl::negation<absl::disjunction<
+ std::is_same<absl::StatusOr<T>,
+ absl::remove_cv_t<absl::remove_reference_t<U>>>,
+ std::is_same<absl::Status,
+ absl::remove_cv_t<absl::remove_reference_t<U>>>,
+ std::is_same<absl::in_place_t,
+ absl::remove_cv_t<absl::remove_reference_t<U>>>,
+ IsDirectInitializationAmbiguous<T, U>>>>;
+
+// This trait detects whether `StatusOr<T>::operator=(U&&)` is ambiguous, which
+// is equivalent to whether all the following conditions are met:
+// 1. `U` is `StatusOr<V>`.
+// 2. `T` is constructible and assignable from `V`.
+// 3. `T` is constructible and assignable from `U` (i.e. `StatusOr<V>`).
+// For example, the following code is considered ambiguous:
+// (`T` is `bool`, `U` is `StatusOr<bool>`, `V` is `bool`)
+// StatusOr<bool> s1 = true; // s1.ok() && s1.ValueOrDie() == true
+// StatusOr<bool> s2 = false; // s2.ok() && s2.ValueOrDie() == false
+// s1 = s2; // ambiguous, `s1 = s2.ValueOrDie()` or `s1 = bool(s2)`?
+template <typename T, typename U>
+struct IsForwardingAssignmentAmbiguous
+ : public absl::conditional_t<
+ std::is_same<absl::remove_cv_t<absl::remove_reference_t<U>>,
+ U>::value,
+ std::false_type,
+ IsForwardingAssignmentAmbiguous<
+ T, absl::remove_cv_t<absl::remove_reference_t<U>>>> {};
+
+template <typename T, typename U>
+struct IsForwardingAssignmentAmbiguous<T, absl::StatusOr<U>>
+ : public IsConstructibleOrConvertibleOrAssignableFromStatusOr<T, U> {};
+
+// Checks against the constraints of the forwarding assignment, i.e. whether
+// `StatusOr<T>::operator(U&&)` should participate in overload resolution.
+template <typename T, typename U>
+using IsForwardingAssignmentValid = absl::disjunction<
+ // Short circuits if T is basically U.
+ std::is_same<T, absl::remove_cv_t<absl::remove_reference_t<U>>>,
+ absl::negation<absl::disjunction<
+ std::is_same<absl::StatusOr<T>,
+ absl::remove_cv_t<absl::remove_reference_t<U>>>,
+ std::is_same<absl::Status,
+ absl::remove_cv_t<absl::remove_reference_t<U>>>,
+ std::is_same<absl::in_place_t,
+ absl::remove_cv_t<absl::remove_reference_t<U>>>,
+ IsForwardingAssignmentAmbiguous<T, U>>>>;
+
+class Helper {
+ public:
+ // Move type-agnostic error handling to the .cc.
+ static void HandleInvalidStatusCtorArg(Status*);
+ ABSL_ATTRIBUTE_NORETURN static void Crash(const absl::Status& status);
+};
+
+// Construct an instance of T in `p` through placement new, passing Args... to
+// the constructor.
+// This abstraction is here mostly for the gcc performance fix.
+template <typename T, typename... Args>
+ABSL_ATTRIBUTE_NONNULL(1) void PlacementNew(void* p, Args&&... args) {
+ new (p) T(std::forward<Args>(args)...);
+}
+
+// Helper base class to hold the data and all operations.
+// We move all this to a base class to allow mixing with the appropriate
+// TraitsBase specialization.
+template <typename T>
+class StatusOrData {
+ template <typename U>
+ friend class StatusOrData;
+
+ public:
+ StatusOrData() = delete;
+
+ StatusOrData(const StatusOrData& other) {
+ if (other.ok()) {
+ MakeValue(other.data_);
+ MakeStatus();
+ } else {
+ MakeStatus(other.status_);
+ }
+ }
+
+ StatusOrData(StatusOrData&& other) noexcept {
+ if (other.ok()) {
+ MakeValue(std::move(other.data_));
+ MakeStatus();
+ } else {
+ MakeStatus(std::move(other.status_));
+ }
+ }
+
+ template <typename U>
+ explicit StatusOrData(const StatusOrData<U>& other) {
+ if (other.ok()) {
+ MakeValue(other.data_);
+ MakeStatus();
+ } else {
+ MakeStatus(other.status_);
+ }
+ }
+
+ template <typename U>
+ explicit StatusOrData(StatusOrData<U>&& other) {
+ if (other.ok()) {
+ MakeValue(std::move(other.data_));
+ MakeStatus();
+ } else {
+ MakeStatus(std::move(other.status_));
+ }
+ }
+
+ template <typename... Args>
+ explicit StatusOrData(absl::in_place_t, Args&&... args)
+ : data_(std::forward<Args>(args)...) {
+ MakeStatus();
+ }
+
+ explicit StatusOrData(const T& value) : data_(value) {
+ MakeStatus();
+ }
+ explicit StatusOrData(T&& value) : data_(std::move(value)) {
+ MakeStatus();
+ }
+
+ template <typename U,
+ absl::enable_if_t<std::is_constructible<absl::Status, U&&>::value,
+ int> = 0>
+ explicit StatusOrData(U&& v) : status_(std::forward<U>(v)) {
+ EnsureNotOk();
+ }
+
+ StatusOrData& operator=(const StatusOrData& other) {
+ if (this == &other) return *this;
+ if (other.ok())
+ Assign(other.data_);
+ else
+ AssignStatus(other.status_);
+ return *this;
+ }
+
+ StatusOrData& operator=(StatusOrData&& other) {
+ if (this == &other) return *this;
+ if (other.ok())
+ Assign(std::move(other.data_));
+ else
+ AssignStatus(std::move(other.status_));
+ return *this;
+ }
+
+ ~StatusOrData() {
+ if (ok()) {
+ status_.~Status();
+ data_.~T();
+ } else {
+ status_.~Status();
+ }
+ }
+
+ template <typename U>
+ void Assign(U&& value) {
+ if (ok()) {
+ data_ = std::forward<U>(value);
+ } else {
+ MakeValue(std::forward<U>(value));
+ status_ = OkStatus();
+ }
+ }
+
+ template <typename U>
+ void AssignStatus(U&& v) {
+ Clear();
+ status_ = static_cast<absl::Status>(std::forward<U>(v));
+ EnsureNotOk();
+ }
+
+ bool ok() const { return status_.ok(); }
+
+ protected:
+ // status_ will always be active after the constructor.
+ // We make it a union to be able to initialize exactly how we need without
+ // waste.
+ // Eg. in the copy constructor we use the default constructor of Status in
+ // the ok() path to avoid an extra Ref call.
+ union {
+ Status status_;
+ };
+
+ // data_ is active iff status_.ok()==true
+ struct Dummy {};
+ union {
+ // When T is const, we need some non-const object we can cast to void* for
+ // the placement new. dummy_ is that object.
+ Dummy dummy_;
+ T data_;
+ };
+
+ void Clear() {
+ if (ok()) data_.~T();
+ }
+
+ void EnsureOk() const {
+ if (ABSL_PREDICT_FALSE(!ok())) Helper::Crash(status_);
+ }
+
+ void EnsureNotOk() {
+ if (ABSL_PREDICT_FALSE(ok())) Helper::HandleInvalidStatusCtorArg(&status_);
+ }
+
+ // Construct the value (ie. data_) through placement new with the passed
+ // argument.
+ template <typename... Arg>
+ void MakeValue(Arg&&... arg) {
+ internal_statusor::PlacementNew<T>(&dummy_, std::forward<Arg>(arg)...);
+ }
+
+ // Construct the status (ie. status_) through placement new with the passed
+ // argument.
+ template <typename... Args>
+ void MakeStatus(Args&&... args) {
+ internal_statusor::PlacementNew<Status>(&status_,
+ std::forward<Args>(args)...);
+ }
+};
+
+// Helper base classes to allow implicitly deleted constructors and assignment
+// operators in `StatusOr`. For example, `CopyCtorBase` will explicitly delete
+// the copy constructor when T is not copy constructible and `StatusOr` will
+// inherit that behavior implicitly.
+template <typename T, bool = std::is_copy_constructible<T>::value>
+struct CopyCtorBase {
+ CopyCtorBase() = default;
+ CopyCtorBase(const CopyCtorBase&) = default;
+ CopyCtorBase(CopyCtorBase&&) = default;
+ CopyCtorBase& operator=(const CopyCtorBase&) = default;
+ CopyCtorBase& operator=(CopyCtorBase&&) = default;
+};
+
+template <typename T>
+struct CopyCtorBase<T, false> {
+ CopyCtorBase() = default;
+ CopyCtorBase(const CopyCtorBase&) = delete;
+ CopyCtorBase(CopyCtorBase&&) = default;
+ CopyCtorBase& operator=(const CopyCtorBase&) = default;
+ CopyCtorBase& operator=(CopyCtorBase&&) = default;
+};
+
+template <typename T, bool = std::is_move_constructible<T>::value>
+struct MoveCtorBase {
+ MoveCtorBase() = default;
+ MoveCtorBase(const MoveCtorBase&) = default;
+ MoveCtorBase(MoveCtorBase&&) = default;
+ MoveCtorBase& operator=(const MoveCtorBase&) = default;
+ MoveCtorBase& operator=(MoveCtorBase&&) = default;
+};
+
+template <typename T>
+struct MoveCtorBase<T, false> {
+ MoveCtorBase() = default;
+ MoveCtorBase(const MoveCtorBase&) = default;
+ MoveCtorBase(MoveCtorBase&&) = delete;
+ MoveCtorBase& operator=(const MoveCtorBase&) = default;
+ MoveCtorBase& operator=(MoveCtorBase&&) = default;
+};
+
+template <typename T, bool = std::is_copy_constructible<T>::value&&
+ std::is_copy_assignable<T>::value>
+struct CopyAssignBase {
+ CopyAssignBase() = default;
+ CopyAssignBase(const CopyAssignBase&) = default;
+ CopyAssignBase(CopyAssignBase&&) = default;
+ CopyAssignBase& operator=(const CopyAssignBase&) = default;
+ CopyAssignBase& operator=(CopyAssignBase&&) = default;
+};
+
+template <typename T>
+struct CopyAssignBase<T, false> {
+ CopyAssignBase() = default;
+ CopyAssignBase(const CopyAssignBase&) = default;
+ CopyAssignBase(CopyAssignBase&&) = default;
+ CopyAssignBase& operator=(const CopyAssignBase&) = delete;
+ CopyAssignBase& operator=(CopyAssignBase&&) = default;
+};
+
+template <typename T, bool = std::is_move_constructible<T>::value&&
+ std::is_move_assignable<T>::value>
+struct MoveAssignBase {
+ MoveAssignBase() = default;
+ MoveAssignBase(const MoveAssignBase&) = default;
+ MoveAssignBase(MoveAssignBase&&) = default;
+ MoveAssignBase& operator=(const MoveAssignBase&) = default;
+ MoveAssignBase& operator=(MoveAssignBase&&) = default;
+};
+
+template <typename T>
+struct MoveAssignBase<T, false> {
+ MoveAssignBase() = default;
+ MoveAssignBase(const MoveAssignBase&) = default;
+ MoveAssignBase(MoveAssignBase&&) = default;
+ MoveAssignBase& operator=(const MoveAssignBase&) = default;
+ MoveAssignBase& operator=(MoveAssignBase&&) = delete;
+};
+
+ABSL_ATTRIBUTE_NORETURN void ThrowBadStatusOrAccess(absl::Status status);
+
+} // namespace internal_statusor
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_STATUS_INTERNAL_STATUSOR_INTERNAL_H_
diff --git a/third_party/abseil/src/absl/status/status.cc b/third_party/abseil/src/absl/status/status.cc
new file mode 100644
index 0000000..c71de84
--- /dev/null
+++ b/third_party/abseil/src/absl/status/status.cc
@@ -0,0 +1,442 @@
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+#include "absl/status/status.h"
+
+#include <cassert>
+
+#include "absl/base/internal/raw_logging.h"
+#include "absl/debugging/stacktrace.h"
+#include "absl/debugging/symbolize.h"
+#include "absl/status/status_payload_printer.h"
+#include "absl/strings/escaping.h"
+#include "absl/strings/str_cat.h"
+#include "absl/strings/str_format.h"
+#include "absl/strings/str_split.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+std::string StatusCodeToString(StatusCode code) {
+ switch (code) {
+ case StatusCode::kOk:
+ return "OK";
+ case StatusCode::kCancelled:
+ return "CANCELLED";
+ case StatusCode::kUnknown:
+ return "UNKNOWN";
+ case StatusCode::kInvalidArgument:
+ return "INVALID_ARGUMENT";
+ case StatusCode::kDeadlineExceeded:
+ return "DEADLINE_EXCEEDED";
+ case StatusCode::kNotFound:
+ return "NOT_FOUND";
+ case StatusCode::kAlreadyExists:
+ return "ALREADY_EXISTS";
+ case StatusCode::kPermissionDenied:
+ return "PERMISSION_DENIED";
+ case StatusCode::kUnauthenticated:
+ return "UNAUTHENTICATED";
+ case StatusCode::kResourceExhausted:
+ return "RESOURCE_EXHAUSTED";
+ case StatusCode::kFailedPrecondition:
+ return "FAILED_PRECONDITION";
+ case StatusCode::kAborted:
+ return "ABORTED";
+ case StatusCode::kOutOfRange:
+ return "OUT_OF_RANGE";
+ case StatusCode::kUnimplemented:
+ return "UNIMPLEMENTED";
+ case StatusCode::kInternal:
+ return "INTERNAL";
+ case StatusCode::kUnavailable:
+ return "UNAVAILABLE";
+ case StatusCode::kDataLoss:
+ return "DATA_LOSS";
+ default:
+ return "";
+ }
+}
+
+std::ostream& operator<<(std::ostream& os, StatusCode code) {
+ return os << StatusCodeToString(code);
+}
+
+namespace status_internal {
+
+static int FindPayloadIndexByUrl(const Payloads* payloads,
+ absl::string_view type_url) {
+ if (payloads == nullptr) return -1;
+
+ for (size_t i = 0; i < payloads->size(); ++i) {
+ if ((*payloads)[i].type_url == type_url) return i;
+ }
+
+ return -1;
+}
+
+// Convert canonical code to a value known to this binary.
+absl::StatusCode MapToLocalCode(int value) {
+ absl::StatusCode code = static_cast<absl::StatusCode>(value);
+ switch (code) {
+ case absl::StatusCode::kOk:
+ case absl::StatusCode::kCancelled:
+ case absl::StatusCode::kUnknown:
+ case absl::StatusCode::kInvalidArgument:
+ case absl::StatusCode::kDeadlineExceeded:
+ case absl::StatusCode::kNotFound:
+ case absl::StatusCode::kAlreadyExists:
+ case absl::StatusCode::kPermissionDenied:
+ case absl::StatusCode::kResourceExhausted:
+ case absl::StatusCode::kFailedPrecondition:
+ case absl::StatusCode::kAborted:
+ case absl::StatusCode::kOutOfRange:
+ case absl::StatusCode::kUnimplemented:
+ case absl::StatusCode::kInternal:
+ case absl::StatusCode::kUnavailable:
+ case absl::StatusCode::kDataLoss:
+ case absl::StatusCode::kUnauthenticated:
+ return code;
+ default:
+ return absl::StatusCode::kUnknown;
+ }
+}
+} // namespace status_internal
+
+absl::optional<absl::Cord> Status::GetPayload(
+ absl::string_view type_url) const {
+ const auto* payloads = GetPayloads();
+ int index = status_internal::FindPayloadIndexByUrl(payloads, type_url);
+ if (index != -1) return (*payloads)[index].payload;
+
+ return absl::nullopt;
+}
+
+void Status::SetPayload(absl::string_view type_url, absl::Cord payload) {
+ if (ok()) return;
+
+ PrepareToModify();
+
+ status_internal::StatusRep* rep = RepToPointer(rep_);
+ if (!rep->payloads) {
+ rep->payloads = absl::make_unique<status_internal::Payloads>();
+ }
+
+ int index =
+ status_internal::FindPayloadIndexByUrl(rep->payloads.get(), type_url);
+ if (index != -1) {
+ (*rep->payloads)[index].payload = std::move(payload);
+ return;
+ }
+
+ rep->payloads->push_back({std::string(type_url), std::move(payload)});
+}
+
+bool Status::ErasePayload(absl::string_view type_url) {
+ int index = status_internal::FindPayloadIndexByUrl(GetPayloads(), type_url);
+ if (index != -1) {
+ PrepareToModify();
+ GetPayloads()->erase(GetPayloads()->begin() + index);
+ if (GetPayloads()->empty() && message().empty()) {
+ // Special case: If this can be represented inlined, it MUST be
+ // inlined (EqualsSlow depends on this behavior).
+ StatusCode c = static_cast<StatusCode>(raw_code());
+ Unref(rep_);
+ rep_ = CodeToInlinedRep(c);
+ }
+ return true;
+ }
+
+ return false;
+}
+
+void Status::ForEachPayload(
+ const std::function<void(absl::string_view, const absl::Cord&)>& visitor)
+ const {
+ if (auto* payloads = GetPayloads()) {
+ bool in_reverse =
+ payloads->size() > 1 && reinterpret_cast<uintptr_t>(payloads) % 13 > 6;
+
+ for (size_t index = 0; index < payloads->size(); ++index) {
+ const auto& elem =
+ (*payloads)[in_reverse ? payloads->size() - 1 - index : index];
+
+#ifdef NDEBUG
+ visitor(elem.type_url, elem.payload);
+#else
+ // In debug mode invalidate the type url to prevent users from relying on
+ // this string lifetime.
+
+ // NOLINTNEXTLINE intentional extra conversion to force temporary.
+ visitor(std::string(elem.type_url), elem.payload);
+#endif // NDEBUG
+ }
+ }
+}
+
+const std::string* Status::EmptyString() {
+ static std::string* empty_string = new std::string();
+ return empty_string;
+}
+
+constexpr const char Status::kMovedFromString[];
+
+const std::string* Status::MovedFromString() {
+ static std::string* moved_from_string = new std::string(kMovedFromString);
+ return moved_from_string;
+}
+
+void Status::UnrefNonInlined(uintptr_t rep) {
+ status_internal::StatusRep* r = RepToPointer(rep);
+ // Fast path: if ref==1, there is no need for a RefCountDec (since
+ // this is the only reference and therefore no other thread is
+ // allowed to be mucking with r).
+ if (r->ref.load(std::memory_order_acquire) == 1 ||
+ r->ref.fetch_sub(1, std::memory_order_acq_rel) - 1 == 0) {
+ delete r;
+ }
+}
+
+uintptr_t Status::NewRep(absl::StatusCode code, absl::string_view msg,
+ std::unique_ptr<status_internal::Payloads> payloads) {
+ status_internal::StatusRep* rep = new status_internal::StatusRep(
+ code, std::string(msg.data(), msg.size()), std::move(payloads));
+ return PointerToRep(rep);
+}
+
+Status::Status(absl::StatusCode code, absl::string_view msg)
+ : rep_(CodeToInlinedRep(code)) {
+ if (code != absl::StatusCode::kOk && !msg.empty()) {
+ rep_ = NewRep(code, msg, nullptr);
+ }
+}
+
+int Status::raw_code() const {
+ if (IsInlined(rep_)) {
+ return static_cast<int>(InlinedRepToCode(rep_));
+ }
+ status_internal::StatusRep* rep = RepToPointer(rep_);
+ return static_cast<int>(rep->code);
+}
+
+absl::StatusCode Status::code() const {
+ return status_internal::MapToLocalCode(raw_code());
+}
+
+void Status::PrepareToModify() {
+ ABSL_RAW_CHECK(!ok(), "PrepareToModify shouldn't be called on OK status.");
+ if (IsInlined(rep_)) {
+ rep_ = NewRep(static_cast<absl::StatusCode>(raw_code()),
+ absl::string_view(), nullptr);
+ return;
+ }
+
+ uintptr_t rep_i = rep_;
+ status_internal::StatusRep* rep = RepToPointer(rep_);
+ if (rep->ref.load(std::memory_order_acquire) != 1) {
+ std::unique_ptr<status_internal::Payloads> payloads;
+ if (rep->payloads) {
+ payloads = absl::make_unique<status_internal::Payloads>(*rep->payloads);
+ }
+ rep_ = NewRep(rep->code, message(), std::move(payloads));
+ UnrefNonInlined(rep_i);
+ }
+}
+
+bool Status::EqualsSlow(const absl::Status& a, const absl::Status& b) {
+ if (IsInlined(a.rep_) != IsInlined(b.rep_)) return false;
+ if (a.message() != b.message()) return false;
+ if (a.raw_code() != b.raw_code()) return false;
+ if (a.GetPayloads() == b.GetPayloads()) return true;
+
+ const status_internal::Payloads no_payloads;
+ const status_internal::Payloads* larger_payloads =
+ a.GetPayloads() ? a.GetPayloads() : &no_payloads;
+ const status_internal::Payloads* smaller_payloads =
+ b.GetPayloads() ? b.GetPayloads() : &no_payloads;
+ if (larger_payloads->size() < smaller_payloads->size()) {
+ std::swap(larger_payloads, smaller_payloads);
+ }
+ if ((larger_payloads->size() - smaller_payloads->size()) > 1) return false;
+ // Payloads can be ordered differently, so we can't just compare payload
+ // vectors.
+ for (const auto& payload : *larger_payloads) {
+
+ bool found = false;
+ for (const auto& other_payload : *smaller_payloads) {
+ if (payload.type_url == other_payload.type_url) {
+ if (payload.payload != other_payload.payload) {
+ return false;
+ }
+ found = true;
+ break;
+ }
+ }
+ if (!found) return false;
+ }
+ return true;
+}
+
+std::string Status::ToStringSlow() const {
+ std::string text;
+ absl::StrAppend(&text, absl::StatusCodeToString(code()), ": ", message());
+ status_internal::StatusPayloadPrinter printer =
+ status_internal::GetStatusPayloadPrinter();
+ this->ForEachPayload([&](absl::string_view type_url,
+ const absl::Cord& payload) {
+ absl::optional<std::string> result;
+ if (printer) result = printer(type_url, payload);
+ absl::StrAppend(
+ &text, " [", type_url, "='",
+ result.has_value() ? *result : absl::CHexEscape(std::string(payload)),
+ "']");
+ });
+
+ return text;
+}
+
+std::ostream& operator<<(std::ostream& os, const Status& x) {
+ os << x.ToString();
+ return os;
+}
+
+Status AbortedError(absl::string_view message) {
+ return Status(absl::StatusCode::kAborted, message);
+}
+
+Status AlreadyExistsError(absl::string_view message) {
+ return Status(absl::StatusCode::kAlreadyExists, message);
+}
+
+Status CancelledError(absl::string_view message) {
+ return Status(absl::StatusCode::kCancelled, message);
+}
+
+Status DataLossError(absl::string_view message) {
+ return Status(absl::StatusCode::kDataLoss, message);
+}
+
+Status DeadlineExceededError(absl::string_view message) {
+ return Status(absl::StatusCode::kDeadlineExceeded, message);
+}
+
+Status FailedPreconditionError(absl::string_view message) {
+ return Status(absl::StatusCode::kFailedPrecondition, message);
+}
+
+Status InternalError(absl::string_view message) {
+ return Status(absl::StatusCode::kInternal, message);
+}
+
+Status InvalidArgumentError(absl::string_view message) {
+ return Status(absl::StatusCode::kInvalidArgument, message);
+}
+
+Status NotFoundError(absl::string_view message) {
+ return Status(absl::StatusCode::kNotFound, message);
+}
+
+Status OutOfRangeError(absl::string_view message) {
+ return Status(absl::StatusCode::kOutOfRange, message);
+}
+
+Status PermissionDeniedError(absl::string_view message) {
+ return Status(absl::StatusCode::kPermissionDenied, message);
+}
+
+Status ResourceExhaustedError(absl::string_view message) {
+ return Status(absl::StatusCode::kResourceExhausted, message);
+}
+
+Status UnauthenticatedError(absl::string_view message) {
+ return Status(absl::StatusCode::kUnauthenticated, message);
+}
+
+Status UnavailableError(absl::string_view message) {
+ return Status(absl::StatusCode::kUnavailable, message);
+}
+
+Status UnimplementedError(absl::string_view message) {
+ return Status(absl::StatusCode::kUnimplemented, message);
+}
+
+Status UnknownError(absl::string_view message) {
+ return Status(absl::StatusCode::kUnknown, message);
+}
+
+bool IsAborted(const Status& status) {
+ return status.code() == absl::StatusCode::kAborted;
+}
+
+bool IsAlreadyExists(const Status& status) {
+ return status.code() == absl::StatusCode::kAlreadyExists;
+}
+
+bool IsCancelled(const Status& status) {
+ return status.code() == absl::StatusCode::kCancelled;
+}
+
+bool IsDataLoss(const Status& status) {
+ return status.code() == absl::StatusCode::kDataLoss;
+}
+
+bool IsDeadlineExceeded(const Status& status) {
+ return status.code() == absl::StatusCode::kDeadlineExceeded;
+}
+
+bool IsFailedPrecondition(const Status& status) {
+ return status.code() == absl::StatusCode::kFailedPrecondition;
+}
+
+bool IsInternal(const Status& status) {
+ return status.code() == absl::StatusCode::kInternal;
+}
+
+bool IsInvalidArgument(const Status& status) {
+ return status.code() == absl::StatusCode::kInvalidArgument;
+}
+
+bool IsNotFound(const Status& status) {
+ return status.code() == absl::StatusCode::kNotFound;
+}
+
+bool IsOutOfRange(const Status& status) {
+ return status.code() == absl::StatusCode::kOutOfRange;
+}
+
+bool IsPermissionDenied(const Status& status) {
+ return status.code() == absl::StatusCode::kPermissionDenied;
+}
+
+bool IsResourceExhausted(const Status& status) {
+ return status.code() == absl::StatusCode::kResourceExhausted;
+}
+
+bool IsUnauthenticated(const Status& status) {
+ return status.code() == absl::StatusCode::kUnauthenticated;
+}
+
+bool IsUnavailable(const Status& status) {
+ return status.code() == absl::StatusCode::kUnavailable;
+}
+
+bool IsUnimplemented(const Status& status) {
+ return status.code() == absl::StatusCode::kUnimplemented;
+}
+
+bool IsUnknown(const Status& status) {
+ return status.code() == absl::StatusCode::kUnknown;
+}
+
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/status/status.h b/third_party/abseil/src/absl/status/status.h
new file mode 100644
index 0000000..c4d6fce
--- /dev/null
+++ b/third_party/abseil/src/absl/status/status.h
@@ -0,0 +1,817 @@
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: status.h
+// -----------------------------------------------------------------------------
+//
+// This header file defines the Abseil `status` library, consisting of:
+//
+// * An `absl::Status` class for holding error handling information
+// * A set of canonical `absl::StatusCode` error codes, and associated
+// utilities for generating and propagating status codes.
+// * A set of helper functions for creating status codes and checking their
+// values
+//
+// Within Google, `absl::Status` is the primary mechanism for gracefully
+// handling errors across API boundaries (and in particular across RPC
+// boundaries). Some of these errors may be recoverable, but others may not.
+// Most functions that can produce a recoverable error should be designed to
+// return an `absl::Status` (or `absl::StatusOr`).
+//
+// Example:
+//
+// absl::Status myFunction(absl::string_view fname, ...) {
+// ...
+// // encounter error
+// if (error condition) {
+// return absl::InvalidArgumentError("bad mode");
+// }
+// // else, return OK
+// return absl::OkStatus();
+// }
+//
+// An `absl::Status` is designed to either return "OK" or one of a number of
+// different error codes, corresponding to typical error conditions.
+// In almost all cases, when using `absl::Status` you should use the canonical
+// error codes (of type `absl::StatusCode`) enumerated in this header file.
+// These canonical codes are understood across the codebase and will be
+// accepted across all API and RPC boundaries.
+#ifndef ABSL_STATUS_STATUS_H_
+#define ABSL_STATUS_STATUS_H_
+
+#include <iostream>
+#include <string>
+
+#include "absl/container/inlined_vector.h"
+#include "absl/status/internal/status_internal.h"
+#include "absl/strings/cord.h"
+#include "absl/types/optional.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+// absl::StatusCode
+//
+// An `absl::StatusCode` is an enumerated type indicating either no error ("OK")
+// or an error condition. In most cases, an `absl::Status` indicates a
+// recoverable error, and the purpose of signalling an error is to indicate what
+// action to take in response to that error. These error codes map to the proto
+// RPC error codes indicated in https://cloud.google.com/apis/design/errors.
+//
+// The errors listed below are the canonical errors associated with
+// `absl::Status` and are used throughout the codebase. As a result, these
+// error codes are somewhat generic.
+//
+// In general, try to return the most specific error that applies if more than
+// one error may pertain. For example, prefer `kOutOfRange` over
+// `kFailedPrecondition` if both codes apply. Similarly prefer `kNotFound` or
+// `kAlreadyExists` over `kFailedPrecondition`.
+//
+// Because these errors may travel RPC boundaries, these codes are tied to the
+// `google.rpc.Code` definitions within
+// https://github.com/googleapis/googleapis/blob/master/google/rpc/code.proto
+// The string value of these RPC codes is denoted within each enum below.
+//
+// If your error handling code requires more context, you can attach payloads
+// to your status. See `absl::Status::SetPayload()` and
+// `absl::Status::GetPayload()` below.
+enum class StatusCode : int {
+ // StatusCode::kOk
+ //
+ // kOK (gRPC code "OK") does not indicate an error; this value is returned on
+ // success. It is typical to check for this value before proceeding on any
+ // given call across an API or RPC boundary. To check this value, use the
+ // `absl::Status::ok()` member function rather than inspecting the raw code.
+ kOk = 0,
+
+ // StatusCode::kCancelled
+ //
+ // kCancelled (gRPC code "CANCELLED") indicates the operation was cancelled,
+ // typically by the caller.
+ kCancelled = 1,
+
+ // StatusCode::kUnknown
+ //
+ // kUnknown (gRPC code "UNKNOWN") indicates an unknown error occurred. In
+ // general, more specific errors should be raised, if possible. Errors raised
+ // by APIs that do not return enough error information may be converted to
+ // this error.
+ kUnknown = 2,
+
+ // StatusCode::kInvalidArgument
+ //
+ // kInvalidArgument (gRPC code "INVALID_ARGUMENT") indicates the caller
+ // specified an invalid argument, such a malformed filename. Note that such
+ // errors should be narrowly limited to indicate to the invalid nature of the
+ // arguments themselves. Errors with validly formed arguments that may cause
+ // errors with the state of the receiving system should be denoted with
+ // `kFailedPrecondition` instead.
+ kInvalidArgument = 3,
+
+ // StatusCode::kDeadlineExceeded
+ //
+ // kDeadlineExceeded (gRPC code "DEADLINE_EXCEEDED") indicates a deadline
+ // expired before the operation could complete. For operations that may change
+ // state within a system, this error may be returned even if the operation has
+ // completed successfully. For example, a successful response from a server
+ // could have been delayed long enough for the deadline to expire.
+ kDeadlineExceeded = 4,
+
+ // StatusCode::kNotFound
+ //
+ // kNotFound (gRPC code "NOT_FOUND") indicates some requested entity (such as
+ // a file or directory) was not found.
+ //
+ // `kNotFound` is useful if a request should be denied for an entire class of
+ // users, such as during a gradual feature rollout or undocumented allow list.
+ // If, instead, a request should be denied for specific sets of users, such as
+ // through user-based access control, use `kPermissionDenied` instead.
+ kNotFound = 5,
+
+ // StatusCode::kAlreadyExists
+ //
+ // kAlreadyExists (gRPC code "ALREADY_EXISTS") indicates the entity that a
+ // caller attempted to create (such as file or directory) is already present.
+ kAlreadyExists = 6,
+
+ // StatusCode::kPermissionDenied
+ //
+ // kPermissionDenied (gRPC code "PERMISSION_DENIED") indicates that the caller
+ // does not have permission to execute the specified operation. Note that this
+ // error is different than an error due to an *un*authenticated user. This
+ // error code does not imply the request is valid or the requested entity
+ // exists or satisfies any other pre-conditions.
+ //
+ // `kPermissionDenied` must not be used for rejections caused by exhausting
+ // some resource. Instead, use `kResourceExhausted` for those errors.
+ // `kPermissionDenied` must not be used if the caller cannot be identified.
+ // Instead, use `kUnauthenticated` for those errors.
+ kPermissionDenied = 7,
+
+ // StatusCode::kResourceExhausted
+ //
+ // kResourceExhausted (gRPC code "RESOURCE_EXHAUSTED") indicates some resource
+ // has been exhausted, perhaps a per-user quota, or perhaps the entire file
+ // system is out of space.
+ kResourceExhausted = 8,
+
+ // StatusCode::kFailedPrecondition
+ //
+ // kFailedPrecondition (gRPC code "FAILED_PRECONDITION") indicates that the
+ // operation was rejected because the system is not in a state required for
+ // the operation's execution. For example, a directory to be deleted may be
+ // non-empty, an "rmdir" operation is applied to a non-directory, etc.
+ //
+ // Some guidelines that may help a service implementer in deciding between
+ // `kFailedPrecondition`, `kAborted`, and `kUnavailable`:
+ //
+ // (a) Use `kUnavailable` if the client can retry just the failing call.
+ // (b) Use `kAborted` if the client should retry at a higher transaction
+ // level (such as when a client-specified test-and-set fails, indicating
+ // the client should restart a read-modify-write sequence).
+ // (c) Use `kFailedPrecondition` if the client should not retry until
+ // the system state has been explicitly fixed. For example, if an "rmdir"
+ // fails because the directory is non-empty, `kFailedPrecondition`
+ // should be returned since the client should not retry unless
+ // the files are deleted from the directory.
+ kFailedPrecondition = 9,
+
+ // StatusCode::kAborted
+ //
+ // kAborted (gRPC code "ABORTED") indicates the operation was aborted,
+ // typically due to a concurrency issue such as a sequencer check failure or a
+ // failed transaction.
+ //
+ // See the guidelines above for deciding between `kFailedPrecondition`,
+ // `kAborted`, and `kUnavailable`.
+ kAborted = 10,
+
+ // StatusCode::kOutOfRange
+ //
+ // kOutOfRange (gRPC code "OUT_OF_RANGE") indicates the operation was
+ // attempted past the valid range, such as seeking or reading past an
+ // end-of-file.
+ //
+ // Unlike `kInvalidArgument`, this error indicates a problem that may
+ // be fixed if the system state changes. For example, a 32-bit file
+ // system will generate `kInvalidArgument` if asked to read at an
+ // offset that is not in the range [0,2^32-1], but it will generate
+ // `kOutOfRange` if asked to read from an offset past the current
+ // file size.
+ //
+ // There is a fair bit of overlap between `kFailedPrecondition` and
+ // `kOutOfRange`. We recommend using `kOutOfRange` (the more specific
+ // error) when it applies so that callers who are iterating through
+ // a space can easily look for an `kOutOfRange` error to detect when
+ // they are done.
+ kOutOfRange = 11,
+
+ // StatusCode::kUnimplemented
+ //
+ // kUnimplemented (gRPC code "UNIMPLEMENTED") indicates the operation is not
+ // implemented or supported in this service. In this case, the operation
+ // should not be re-attempted.
+ kUnimplemented = 12,
+
+ // StatusCode::kInternal
+ //
+ // kInternal (gRPC code "INTERNAL") indicates an internal error has occurred
+ // and some invariants expected by the underlying system have not been
+ // satisfied. This error code is reserved for serious errors.
+ kInternal = 13,
+
+ // StatusCode::kUnavailable
+ //
+ // kUnavailable (gRPC code "UNAVAILABLE") indicates the service is currently
+ // unavailable and that this is most likely a transient condition. An error
+ // such as this can be corrected by retrying with a backoff scheme. Note that
+ // it is not always safe to retry non-idempotent operations.
+ //
+ // See the guidelines above for deciding between `kFailedPrecondition`,
+ // `kAborted`, and `kUnavailable`.
+ kUnavailable = 14,
+
+ // StatusCode::kDataLoss
+ //
+ // kDataLoss (gRPC code "DATA_LOSS") indicates that unrecoverable data loss or
+ // corruption has occurred. As this error is serious, proper alerting should
+ // be attached to errors such as this.
+ kDataLoss = 15,
+
+ // StatusCode::kUnauthenticated
+ //
+ // kUnauthenticated (gRPC code "UNAUTHENTICATED") indicates that the request
+ // does not have valid authentication credentials for the operation. Correct
+ // the authentication and try again.
+ kUnauthenticated = 16,
+
+ // StatusCode::DoNotUseReservedForFutureExpansionUseDefaultInSwitchInstead_
+ //
+ // NOTE: this error code entry should not be used and you should not rely on
+ // its value, which may change.
+ //
+ // The purpose of this enumerated value is to force people who handle status
+ // codes with `switch()` statements to *not* simply enumerate all possible
+ // values, but instead provide a "default:" case. Providing such a default
+ // case ensures that code will compile when new codes are added.
+ kDoNotUseReservedForFutureExpansionUseDefaultInSwitchInstead_ = 20
+};
+
+// StatusCodeToString()
+//
+// Returns the name for the status code, or "" if it is an unknown value.
+std::string StatusCodeToString(StatusCode code);
+
+// operator<<
+//
+// Streams StatusCodeToString(code) to `os`.
+std::ostream& operator<<(std::ostream& os, StatusCode code);
+
+// absl::Status
+//
+// The `absl::Status` class is generally used to gracefully handle errors
+// across API boundaries (and in particular across RPC boundaries). Some of
+// these errors may be recoverable, but others may not. Most
+// functions which can produce a recoverable error should be designed to return
+// either an `absl::Status` (or the similar `absl::StatusOr<T>`, which holds
+// either an object of type `T` or an error).
+//
+// API developers should construct their functions to return `absl::OkStatus()`
+// upon success, or an `absl::StatusCode` upon another type of error (e.g
+// an `absl::StatusCode::kInvalidArgument` error). The API provides convenience
+// functions to constuct each status code.
+//
+// Example:
+//
+// absl::Status myFunction(absl::string_view fname, ...) {
+// ...
+// // encounter error
+// if (error condition) {
+// // Construct an absl::StatusCode::kInvalidArgument error
+// return absl::InvalidArgumentError("bad mode");
+// }
+// // else, return OK
+// return absl::OkStatus();
+// }
+//
+// Users handling status error codes should prefer checking for an OK status
+// using the `ok()` member function. Handling multiple error codes may justify
+// use of switch statement, but only check for error codes you know how to
+// handle; do not try to exhaustively match against all canonical error codes.
+// Errors that cannot be handled should be logged and/or propagated for higher
+// levels to deal with. If you do use a switch statement, make sure that you
+// also provide a `default:` switch case, so that code does not break as other
+// canonical codes are added to the API.
+//
+// Example:
+//
+// absl::Status result = DoSomething();
+// if (!result.ok()) {
+// LOG(ERROR) << result;
+// }
+//
+// // Provide a default if switching on multiple error codes
+// switch (result.code()) {
+// // The user hasn't authenticated. Ask them to reauth
+// case absl::StatusCode::kUnauthenticated:
+// DoReAuth();
+// break;
+// // The user does not have permission. Log an error.
+// case absl::StatusCode::kPermissionDenied:
+// LOG(ERROR) << result;
+// break;
+// // Propagate the error otherwise.
+// default:
+// return true;
+// }
+//
+// An `absl::Status` can optionally include a payload with more information
+// about the error. Typically, this payload serves one of several purposes:
+//
+// * It may provide more fine-grained semantic information about the error to
+// facilitate actionable remedies.
+// * It may provide human-readable contexual information that is more
+// appropriate to display to an end user.
+//
+// Example:
+//
+// absl::Status result = DoSomething();
+// // Inform user to retry after 30 seconds
+// // See more error details in googleapis/google/rpc/error_details.proto
+// if (absl::IsResourceExhausted(result)) {
+// google::rpc::RetryInfo info;
+// info.retry_delay().seconds() = 30;
+// // Payloads require a unique key (a URL to ensure no collisions with
+// // other payloads), and an `absl::Cord` to hold the encoded data.
+// absl::string_view url = "type.googleapis.com/google.rpc.RetryInfo";
+// result.SetPayload(url, info.SerializeAsCord());
+// return result;
+// }
+//
+class ABSL_MUST_USE_RESULT Status final {
+ public:
+ // Constructors
+
+ // This default constructor creates an OK status with no message or payload.
+ // Avoid this constructor and prefer explicit construction of an OK status
+ // with `absl::OkStatus()`.
+ Status();
+
+ // Creates a status in the canonical error space with the specified
+ // `absl::StatusCode` and error message. If `code == absl::StatusCode::kOk`,
+ // `msg` is ignored and an object identical to an OK status is constructed.
+ //
+ // The `msg` string must be in UTF-8. The implementation may complain (e.g.,
+ // by printing a warning) if it is not.
+ Status(absl::StatusCode code, absl::string_view msg);
+
+ Status(const Status&);
+ Status& operator=(const Status& x);
+
+ // Move operators
+
+ // The moved-from state is valid but unspecified.
+ Status(Status&&) noexcept;
+ Status& operator=(Status&&);
+
+ ~Status();
+
+ // Status::Update()
+ //
+ // Updates the existing status with `new_status` provided that `this->ok()`.
+ // If the existing status already contains a non-OK error, this update has no
+ // effect and preserves the current data. Note that this behavior may change
+ // in the future to augment a current non-ok status with additional
+ // information about `new_status`.
+ //
+ // `Update()` provides a convenient way of keeping track of the first error
+ // encountered.
+ //
+ // Example:
+ // // Instead of "if (overall_status.ok()) overall_status = new_status"
+ // overall_status.Update(new_status);
+ //
+ void Update(const Status& new_status);
+ void Update(Status&& new_status);
+
+ // Status::ok()
+ //
+ // Returns `true` if `this->ok()`. Prefer checking for an OK status using this
+ // member function.
+ ABSL_MUST_USE_RESULT bool ok() const;
+
+ // Status::code()
+ //
+ // Returns the canonical error code of type `absl::StatusCode` of this status.
+ absl::StatusCode code() const;
+
+ // Status::raw_code()
+ //
+ // Returns a raw (canonical) error code corresponding to the enum value of
+ // `google.rpc.Code` definitions within
+ // https://github.com/googleapis/googleapis/blob/master/google/rpc/code.proto.
+ // These values could be out of the range of canonical `absl::StatusCode`
+ // enum values.
+ //
+ // NOTE: This function should only be called when converting to an associated
+ // wire format. Use `Status::code()` for error handling.
+ int raw_code() const;
+
+ // Status::message()
+ //
+ // Returns the error message associated with this error code, if available.
+ // Note that this message rarely describes the error code. It is not unusual
+ // for the error message to be the empty string. As a result, prefer
+ // `Status::ToString()` for debug logging.
+ absl::string_view message() const;
+
+ friend bool operator==(const Status&, const Status&);
+ friend bool operator!=(const Status&, const Status&);
+
+ // Status::ToString()
+ //
+ // Returns a combination of the error code name, the message and any
+ // associated payload messages. This string is designed simply to be human
+ // readable and its exact format should not be load bearing. Do not depend on
+ // the exact format of the result of `ToString()` which is subject to change.
+ //
+ // The printed code name and the message are generally substrings of the
+ // result, and the payloads to be printed use the status payload printer
+ // mechanism (which is internal).
+ std::string ToString() const;
+
+ // Status::IgnoreError()
+ //
+ // Ignores any errors. This method does nothing except potentially suppress
+ // complaints from any tools that are checking that errors are not dropped on
+ // the floor.
+ void IgnoreError() const;
+
+ // swap()
+ //
+ // Swap the contents of one status with another.
+ friend void swap(Status& a, Status& b);
+
+ //----------------------------------------------------------------------------
+ // Payload Management APIs
+ //----------------------------------------------------------------------------
+
+ // A payload may be attached to a status to provide additional context to an
+ // error that may not be satisifed by an existing `absl::StatusCode`.
+ // Typically, this payload serves one of several purposes:
+ //
+ // * It may provide more fine-grained semantic information about the error
+ // to facilitate actionable remedies.
+ // * It may provide human-readable contexual information that is more
+ // appropriate to display to an end user.
+ //
+ // A payload consists of a [key,value] pair, where the key is a string
+ // referring to a unique "type URL" and the value is an object of type
+ // `absl::Cord` to hold the contextual data.
+ //
+ // The "type URL" should be unique and follow the format of a URL
+ // (https://en.wikipedia.org/wiki/URL) and, ideally, provide some
+ // documentation or schema on how to interpret its associated data. For
+ // example, the default type URL for a protobuf message type is
+ // "type.googleapis.com/packagename.messagename". Other custom wire formats
+ // should define the format of type URL in a similar practice so as to
+ // minimize the chance of conflict between type URLs.
+ // Users should ensure that the type URL can be mapped to a concrete
+ // C++ type if they want to deserialize the payload and read it effectively.
+ //
+ // To attach a payload to a status object, call `Status::SetPayload()`,
+ // passing it the type URL and an `absl::Cord` of associated data. Similarly,
+ // to extract the payload from a status, call `Status::GetPayload()`. You
+ // may attach multiple payloads (with differing type URLs) to any given
+ // status object, provided that the status is currently exhibiting an error
+ // code (i.e. is not OK).
+
+ // Status::GetPayload()
+ //
+ // Gets the payload of a status given its unique `type_url` key, if present.
+ absl::optional<absl::Cord> GetPayload(absl::string_view type_url) const;
+
+ // Status::SetPayload()
+ //
+ // Sets the payload for a non-ok status using a `type_url` key, overwriting
+ // any existing payload for that `type_url`.
+ //
+ // NOTE: This function does nothing if the Status is ok.
+ void SetPayload(absl::string_view type_url, absl::Cord payload);
+
+ // Status::ErasePayload()
+ //
+ // Erases the payload corresponding to the `type_url` key. Returns `true` if
+ // the payload was present.
+ bool ErasePayload(absl::string_view type_url);
+
+ // Status::ForEachPayload()
+ //
+ // Iterates over the stored payloads and calls the
+ // `visitor(type_key, payload)` callable for each one.
+ //
+ // NOTE: The order of calls to `visitor()` is not specified and may change at
+ // any time.
+ //
+ // NOTE: Any mutation on the same 'absl::Status' object during visitation is
+ // forbidden and could result in undefined behavior.
+ void ForEachPayload(
+ const std::function<void(absl::string_view, const absl::Cord&)>& visitor)
+ const;
+
+ private:
+ friend Status CancelledError();
+
+ // Creates a status in the canonical error space with the specified
+ // code, and an empty error message.
+ explicit Status(absl::StatusCode code);
+
+ static void UnrefNonInlined(uintptr_t rep);
+ static void Ref(uintptr_t rep);
+ static void Unref(uintptr_t rep);
+
+ // REQUIRES: !ok()
+ // Ensures rep_ is not shared with any other Status.
+ void PrepareToModify();
+
+ const status_internal::Payloads* GetPayloads() const;
+ status_internal::Payloads* GetPayloads();
+
+ // Takes ownership of payload.
+ static uintptr_t NewRep(absl::StatusCode code, absl::string_view msg,
+ std::unique_ptr<status_internal::Payloads> payload);
+ static bool EqualsSlow(const absl::Status& a, const absl::Status& b);
+
+ // MSVC 14.0 limitation requires the const.
+ static constexpr const char kMovedFromString[] =
+ "Status accessed after move.";
+
+ static const std::string* EmptyString();
+ static const std::string* MovedFromString();
+
+ // Returns whether rep contains an inlined representation.
+ // See rep_ for details.
+ static bool IsInlined(uintptr_t rep);
+
+ // Indicates whether this Status was the rhs of a move operation. See rep_
+ // for details.
+ static bool IsMovedFrom(uintptr_t rep);
+ static uintptr_t MovedFromRep();
+
+ // Convert between error::Code and the inlined uintptr_t representation used
+ // by rep_. See rep_ for details.
+ static uintptr_t CodeToInlinedRep(absl::StatusCode code);
+ static absl::StatusCode InlinedRepToCode(uintptr_t rep);
+
+ // Converts between StatusRep* and the external uintptr_t representation used
+ // by rep_. See rep_ for details.
+ static uintptr_t PointerToRep(status_internal::StatusRep* r);
+ static status_internal::StatusRep* RepToPointer(uintptr_t r);
+
+ // Returns string for non-ok Status.
+ std::string ToStringSlow() const;
+
+ // Status supports two different representations.
+ // - When the low bit is off it is an inlined representation.
+ // It uses the canonical error space, no message or payload.
+ // The error code is (rep_ >> 2).
+ // The (rep_ & 2) bit is the "moved from" indicator, used in IsMovedFrom().
+ // - When the low bit is on it is an external representation.
+ // In this case all the data comes from a heap allocated Rep object.
+ // (rep_ - 1) is a status_internal::StatusRep* pointer to that structure.
+ uintptr_t rep_;
+};
+
+// OkStatus()
+//
+// Returns an OK status, equivalent to a default constructed instance. Prefer
+// usage of `absl::OkStatus()` when constructing such an OK status.
+Status OkStatus();
+
+// operator<<()
+//
+// Prints a human-readable representation of `x` to `os`.
+std::ostream& operator<<(std::ostream& os, const Status& x);
+
+// IsAborted()
+// IsAlreadyExists()
+// IsCancelled()
+// IsDataLoss()
+// IsDeadlineExceeded()
+// IsFailedPrecondition()
+// IsInternal()
+// IsInvalidArgument()
+// IsNotFound()
+// IsOutOfRange()
+// IsPermissionDenied()
+// IsResourceExhausted()
+// IsUnauthenticated()
+// IsUnavailable()
+// IsUnimplemented()
+// IsUnknown()
+//
+// These convenience functions return `true` if a given status matches the
+// `absl::StatusCode` error code of its associated function.
+ABSL_MUST_USE_RESULT bool IsAborted(const Status& status);
+ABSL_MUST_USE_RESULT bool IsAlreadyExists(const Status& status);
+ABSL_MUST_USE_RESULT bool IsCancelled(const Status& status);
+ABSL_MUST_USE_RESULT bool IsDataLoss(const Status& status);
+ABSL_MUST_USE_RESULT bool IsDeadlineExceeded(const Status& status);
+ABSL_MUST_USE_RESULT bool IsFailedPrecondition(const Status& status);
+ABSL_MUST_USE_RESULT bool IsInternal(const Status& status);
+ABSL_MUST_USE_RESULT bool IsInvalidArgument(const Status& status);
+ABSL_MUST_USE_RESULT bool IsNotFound(const Status& status);
+ABSL_MUST_USE_RESULT bool IsOutOfRange(const Status& status);
+ABSL_MUST_USE_RESULT bool IsPermissionDenied(const Status& status);
+ABSL_MUST_USE_RESULT bool IsResourceExhausted(const Status& status);
+ABSL_MUST_USE_RESULT bool IsUnauthenticated(const Status& status);
+ABSL_MUST_USE_RESULT bool IsUnavailable(const Status& status);
+ABSL_MUST_USE_RESULT bool IsUnimplemented(const Status& status);
+ABSL_MUST_USE_RESULT bool IsUnknown(const Status& status);
+
+// AbortedError()
+// AlreadyExistsError()
+// CancelledError()
+// DataLossError()
+// DeadlineExceededError()
+// FailedPreconditionError()
+// InternalError()
+// InvalidArgumentError()
+// NotFoundError()
+// OutOfRangeError()
+// PermissionDeniedError()
+// ResourceExhaustedError()
+// UnauthenticatedError()
+// UnavailableError()
+// UnimplementedError()
+// UnknownError()
+//
+// These convenience functions create an `absl::Status` object with an error
+// code as indicated by the associated function name, using the error message
+// passed in `message`.
+Status AbortedError(absl::string_view message);
+Status AlreadyExistsError(absl::string_view message);
+Status CancelledError(absl::string_view message);
+Status DataLossError(absl::string_view message);
+Status DeadlineExceededError(absl::string_view message);
+Status FailedPreconditionError(absl::string_view message);
+Status InternalError(absl::string_view message);
+Status InvalidArgumentError(absl::string_view message);
+Status NotFoundError(absl::string_view message);
+Status OutOfRangeError(absl::string_view message);
+Status PermissionDeniedError(absl::string_view message);
+Status ResourceExhaustedError(absl::string_view message);
+Status UnauthenticatedError(absl::string_view message);
+Status UnavailableError(absl::string_view message);
+Status UnimplementedError(absl::string_view message);
+Status UnknownError(absl::string_view message);
+
+//------------------------------------------------------------------------------
+// Implementation details follow
+//------------------------------------------------------------------------------
+
+inline Status::Status() : rep_(CodeToInlinedRep(absl::StatusCode::kOk)) {}
+
+inline Status::Status(absl::StatusCode code) : rep_(CodeToInlinedRep(code)) {}
+
+inline Status::Status(const Status& x) : rep_(x.rep_) { Ref(rep_); }
+
+inline Status& Status::operator=(const Status& x) {
+ uintptr_t old_rep = rep_;
+ if (x.rep_ != old_rep) {
+ Ref(x.rep_);
+ rep_ = x.rep_;
+ Unref(old_rep);
+ }
+ return *this;
+}
+
+inline Status::Status(Status&& x) noexcept : rep_(x.rep_) {
+ x.rep_ = MovedFromRep();
+}
+
+inline Status& Status::operator=(Status&& x) {
+ uintptr_t old_rep = rep_;
+ rep_ = x.rep_;
+ x.rep_ = MovedFromRep();
+ Unref(old_rep);
+ return *this;
+}
+
+inline void Status::Update(const Status& new_status) {
+ if (ok()) {
+ *this = new_status;
+ }
+}
+
+inline void Status::Update(Status&& new_status) {
+ if (ok()) {
+ *this = std::move(new_status);
+ }
+}
+
+inline Status::~Status() { Unref(rep_); }
+
+inline bool Status::ok() const {
+ return rep_ == CodeToInlinedRep(absl::StatusCode::kOk);
+}
+
+inline absl::string_view Status::message() const {
+ return !IsInlined(rep_)
+ ? RepToPointer(rep_)->message
+ : (IsMovedFrom(rep_) ? absl::string_view(kMovedFromString)
+ : absl::string_view());
+}
+
+inline bool operator==(const Status& lhs, const Status& rhs) {
+ return lhs.rep_ == rhs.rep_ || Status::EqualsSlow(lhs, rhs);
+}
+
+inline bool operator!=(const Status& lhs, const Status& rhs) {
+ return !(lhs == rhs);
+}
+
+inline std::string Status::ToString() const {
+ return ok() ? "OK" : ToStringSlow();
+}
+
+inline void Status::IgnoreError() const {
+ // no-op
+}
+
+inline void swap(absl::Status& a, absl::Status& b) {
+ using std::swap;
+ swap(a.rep_, b.rep_);
+}
+
+inline const status_internal::Payloads* Status::GetPayloads() const {
+ return IsInlined(rep_) ? nullptr : RepToPointer(rep_)->payloads.get();
+}
+
+inline status_internal::Payloads* Status::GetPayloads() {
+ return IsInlined(rep_) ? nullptr : RepToPointer(rep_)->payloads.get();
+}
+
+inline bool Status::IsInlined(uintptr_t rep) { return (rep & 1) == 0; }
+
+inline bool Status::IsMovedFrom(uintptr_t rep) {
+ return IsInlined(rep) && (rep & 2) != 0;
+}
+
+inline uintptr_t Status::MovedFromRep() {
+ return CodeToInlinedRep(absl::StatusCode::kInternal) | 2;
+}
+
+inline uintptr_t Status::CodeToInlinedRep(absl::StatusCode code) {
+ return static_cast<uintptr_t>(code) << 2;
+}
+
+inline absl::StatusCode Status::InlinedRepToCode(uintptr_t rep) {
+ assert(IsInlined(rep));
+ return static_cast<absl::StatusCode>(rep >> 2);
+}
+
+inline status_internal::StatusRep* Status::RepToPointer(uintptr_t rep) {
+ assert(!IsInlined(rep));
+ return reinterpret_cast<status_internal::StatusRep*>(rep - 1);
+}
+
+inline uintptr_t Status::PointerToRep(status_internal::StatusRep* rep) {
+ return reinterpret_cast<uintptr_t>(rep) + 1;
+}
+
+inline void Status::Ref(uintptr_t rep) {
+ if (!IsInlined(rep)) {
+ RepToPointer(rep)->ref.fetch_add(1, std::memory_order_relaxed);
+ }
+}
+
+inline void Status::Unref(uintptr_t rep) {
+ if (!IsInlined(rep)) {
+ UnrefNonInlined(rep);
+ }
+}
+
+inline Status OkStatus() { return Status(); }
+
+// Creates a `Status` object with the `absl::StatusCode::kCancelled` error code
+// and an empty message. It is provided only for efficiency, given that
+// message-less kCancelled errors are common in the infrastructure.
+inline Status CancelledError() { return Status(absl::StatusCode::kCancelled); }
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_STATUS_STATUS_H_
diff --git a/third_party/abseil/src/absl/status/status_payload_printer.cc b/third_party/abseil/src/absl/status/status_payload_printer.cc
new file mode 100644
index 0000000..a47aea1
--- /dev/null
+++ b/third_party/abseil/src/absl/status/status_payload_printer.cc
@@ -0,0 +1,38 @@
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+#include "absl/status/status_payload_printer.h"
+
+#include <atomic>
+
+#include "absl/base/attributes.h"
+#include "absl/base/internal/atomic_hook.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace status_internal {
+
+ABSL_INTERNAL_ATOMIC_HOOK_ATTRIBUTES
+static absl::base_internal::AtomicHook<StatusPayloadPrinter> storage;
+
+void SetStatusPayloadPrinter(StatusPayloadPrinter printer) {
+ storage.Store(printer);
+}
+
+StatusPayloadPrinter GetStatusPayloadPrinter() {
+ return storage.Load();
+}
+
+} // namespace status_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/status/status_payload_printer.h b/third_party/abseil/src/absl/status/status_payload_printer.h
new file mode 100644
index 0000000..5e0937f
--- /dev/null
+++ b/third_party/abseil/src/absl/status/status_payload_printer.h
@@ -0,0 +1,51 @@
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+#ifndef ABSL_STATUS_STATUS_PAYLOAD_PRINTER_H_
+#define ABSL_STATUS_STATUS_PAYLOAD_PRINTER_H_
+
+#include <string>
+
+#include "absl/strings/cord.h"
+#include "absl/strings/string_view.h"
+#include "absl/types/optional.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace status_internal {
+
+// By default, `Status::ToString` and `operator<<(Status)` print a payload by
+// dumping the type URL and the raw bytes. To help debugging, we provide an
+// extension point, which is a global printer function that can be set by users
+// to specify how to print payloads. The function takes the type URL and the
+// payload as input, and should return a valid human-readable string on success
+// or `absl::nullopt` on failure (in which case it falls back to the default
+// approach of printing the raw bytes).
+// NOTE: This is an internal API and the design is subject to change in the
+// future in a non-backward-compatible way. Since it's only meant for debugging
+// purpose, you should not rely on it in any critical logic.
+using StatusPayloadPrinter = absl::optional<std::string> (*)(absl::string_view,
+ const absl::Cord&);
+
+// Sets the global payload printer. Only one printer should be set per process.
+// If multiple printers are set, it's undefined which one will be used.
+void SetStatusPayloadPrinter(StatusPayloadPrinter);
+
+// Returns the global payload printer if previously set, otherwise `nullptr`.
+StatusPayloadPrinter GetStatusPayloadPrinter();
+
+} // namespace status_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_STATUS_STATUS_PAYLOAD_PRINTER_H_
diff --git a/third_party/abseil/src/absl/status/status_test.cc b/third_party/abseil/src/absl/status/status_test.cc
new file mode 100644
index 0000000..ca9488a
--- /dev/null
+++ b/third_party/abseil/src/absl/status/status_test.cc
@@ -0,0 +1,458 @@
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/status/status.h"
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/strings/str_cat.h"
+
+namespace {
+
+using ::testing::Eq;
+using ::testing::HasSubstr;
+using ::testing::Optional;
+using ::testing::UnorderedElementsAreArray;
+
+TEST(StatusCode, InsertionOperator) {
+ const absl::StatusCode code = absl::StatusCode::kUnknown;
+ std::ostringstream oss;
+ oss << code;
+ EXPECT_EQ(oss.str(), absl::StatusCodeToString(code));
+}
+
+// This structure holds the details for testing a single error code,
+// its creator, and its classifier.
+struct ErrorTest {
+ absl::StatusCode code;
+ using Creator = absl::Status (*)(absl::string_view);
+ using Classifier = bool (*)(const absl::Status&);
+ Creator creator;
+ Classifier classifier;
+};
+
+constexpr ErrorTest kErrorTests[]{
+ {absl::StatusCode::kCancelled, absl::CancelledError, absl::IsCancelled},
+ {absl::StatusCode::kUnknown, absl::UnknownError, absl::IsUnknown},
+ {absl::StatusCode::kInvalidArgument, absl::InvalidArgumentError,
+ absl::IsInvalidArgument},
+ {absl::StatusCode::kDeadlineExceeded, absl::DeadlineExceededError,
+ absl::IsDeadlineExceeded},
+ {absl::StatusCode::kNotFound, absl::NotFoundError, absl::IsNotFound},
+ {absl::StatusCode::kAlreadyExists, absl::AlreadyExistsError,
+ absl::IsAlreadyExists},
+ {absl::StatusCode::kPermissionDenied, absl::PermissionDeniedError,
+ absl::IsPermissionDenied},
+ {absl::StatusCode::kResourceExhausted, absl::ResourceExhaustedError,
+ absl::IsResourceExhausted},
+ {absl::StatusCode::kFailedPrecondition, absl::FailedPreconditionError,
+ absl::IsFailedPrecondition},
+ {absl::StatusCode::kAborted, absl::AbortedError, absl::IsAborted},
+ {absl::StatusCode::kOutOfRange, absl::OutOfRangeError, absl::IsOutOfRange},
+ {absl::StatusCode::kUnimplemented, absl::UnimplementedError,
+ absl::IsUnimplemented},
+ {absl::StatusCode::kInternal, absl::InternalError, absl::IsInternal},
+ {absl::StatusCode::kUnavailable, absl::UnavailableError,
+ absl::IsUnavailable},
+ {absl::StatusCode::kDataLoss, absl::DataLossError, absl::IsDataLoss},
+ {absl::StatusCode::kUnauthenticated, absl::UnauthenticatedError,
+ absl::IsUnauthenticated},
+};
+
+TEST(Status, CreateAndClassify) {
+ for (const auto& test : kErrorTests) {
+ SCOPED_TRACE(absl::StatusCodeToString(test.code));
+
+ // Ensure that the creator does, in fact, create status objects with the
+ // expected error code and message.
+ std::string message =
+ absl::StrCat("error code ", test.code, " test message");
+ absl::Status status = test.creator(message);
+ EXPECT_EQ(test.code, status.code());
+ EXPECT_EQ(message, status.message());
+
+ // Ensure that the classifier returns true for a status produced by the
+ // creator.
+ EXPECT_TRUE(test.classifier(status));
+
+ // Ensure that the classifier returns false for status with a different
+ // code.
+ for (const auto& other : kErrorTests) {
+ if (other.code != test.code) {
+ EXPECT_FALSE(test.classifier(absl::Status(other.code, "")))
+ << " other.code = " << other.code;
+ }
+ }
+ }
+}
+
+TEST(Status, DefaultConstructor) {
+ absl::Status status;
+ EXPECT_TRUE(status.ok());
+ EXPECT_EQ(absl::StatusCode::kOk, status.code());
+ EXPECT_EQ("", status.message());
+}
+
+TEST(Status, OkStatus) {
+ absl::Status status = absl::OkStatus();
+ EXPECT_TRUE(status.ok());
+ EXPECT_EQ(absl::StatusCode::kOk, status.code());
+ EXPECT_EQ("", status.message());
+}
+
+TEST(Status, ConstructorWithCodeMessage) {
+ {
+ absl::Status status(absl::StatusCode::kCancelled, "");
+ EXPECT_FALSE(status.ok());
+ EXPECT_EQ(absl::StatusCode::kCancelled, status.code());
+ EXPECT_EQ("", status.message());
+ }
+ {
+ absl::Status status(absl::StatusCode::kInternal, "message");
+ EXPECT_FALSE(status.ok());
+ EXPECT_EQ(absl::StatusCode::kInternal, status.code());
+ EXPECT_EQ("message", status.message());
+ }
+}
+
+TEST(Status, ConstructOutOfRangeCode) {
+ const int kRawCode = 9999;
+ absl::Status status(static_cast<absl::StatusCode>(kRawCode), "");
+ EXPECT_EQ(absl::StatusCode::kUnknown, status.code());
+ EXPECT_EQ(kRawCode, status.raw_code());
+}
+
+constexpr char kUrl1[] = "url.payload.1";
+constexpr char kUrl2[] = "url.payload.2";
+constexpr char kUrl3[] = "url.payload.3";
+constexpr char kUrl4[] = "url.payload.xx";
+
+constexpr char kPayload1[] = "aaaaa";
+constexpr char kPayload2[] = "bbbbb";
+constexpr char kPayload3[] = "ccccc";
+
+using PayloadsVec = std::vector<std::pair<std::string, absl::Cord>>;
+
+TEST(Status, TestGetSetPayload) {
+ absl::Status ok_status = absl::OkStatus();
+ ok_status.SetPayload(kUrl1, absl::Cord(kPayload1));
+ ok_status.SetPayload(kUrl2, absl::Cord(kPayload2));
+
+ EXPECT_FALSE(ok_status.GetPayload(kUrl1));
+ EXPECT_FALSE(ok_status.GetPayload(kUrl2));
+
+ absl::Status bad_status(absl::StatusCode::kInternal, "fail");
+ bad_status.SetPayload(kUrl1, absl::Cord(kPayload1));
+ bad_status.SetPayload(kUrl2, absl::Cord(kPayload2));
+
+ EXPECT_THAT(bad_status.GetPayload(kUrl1), Optional(Eq(kPayload1)));
+ EXPECT_THAT(bad_status.GetPayload(kUrl2), Optional(Eq(kPayload2)));
+
+ EXPECT_FALSE(bad_status.GetPayload(kUrl3));
+
+ bad_status.SetPayload(kUrl1, absl::Cord(kPayload3));
+ EXPECT_THAT(bad_status.GetPayload(kUrl1), Optional(Eq(kPayload3)));
+
+ // Testing dynamically generated type_url
+ bad_status.SetPayload(absl::StrCat(kUrl1, ".1"), absl::Cord(kPayload1));
+ EXPECT_THAT(bad_status.GetPayload(absl::StrCat(kUrl1, ".1")),
+ Optional(Eq(kPayload1)));
+}
+
+TEST(Status, TestErasePayload) {
+ absl::Status bad_status(absl::StatusCode::kInternal, "fail");
+ bad_status.SetPayload(kUrl1, absl::Cord(kPayload1));
+ bad_status.SetPayload(kUrl2, absl::Cord(kPayload2));
+ bad_status.SetPayload(kUrl3, absl::Cord(kPayload3));
+
+ EXPECT_FALSE(bad_status.ErasePayload(kUrl4));
+
+ EXPECT_TRUE(bad_status.GetPayload(kUrl2));
+ EXPECT_TRUE(bad_status.ErasePayload(kUrl2));
+ EXPECT_FALSE(bad_status.GetPayload(kUrl2));
+ EXPECT_FALSE(bad_status.ErasePayload(kUrl2));
+
+ EXPECT_TRUE(bad_status.ErasePayload(kUrl1));
+ EXPECT_TRUE(bad_status.ErasePayload(kUrl3));
+
+ bad_status.SetPayload(kUrl1, absl::Cord(kPayload1));
+ EXPECT_TRUE(bad_status.ErasePayload(kUrl1));
+}
+
+TEST(Status, TestComparePayloads) {
+ absl::Status bad_status1(absl::StatusCode::kInternal, "fail");
+ bad_status1.SetPayload(kUrl1, absl::Cord(kPayload1));
+ bad_status1.SetPayload(kUrl2, absl::Cord(kPayload2));
+ bad_status1.SetPayload(kUrl3, absl::Cord(kPayload3));
+
+ absl::Status bad_status2(absl::StatusCode::kInternal, "fail");
+ bad_status2.SetPayload(kUrl2, absl::Cord(kPayload2));
+ bad_status2.SetPayload(kUrl3, absl::Cord(kPayload3));
+ bad_status2.SetPayload(kUrl1, absl::Cord(kPayload1));
+
+ EXPECT_EQ(bad_status1, bad_status2);
+}
+
+TEST(Status, TestComparePayloadsAfterErase) {
+ absl::Status payload_status(absl::StatusCode::kInternal, "");
+ payload_status.SetPayload(kUrl1, absl::Cord(kPayload1));
+ payload_status.SetPayload(kUrl2, absl::Cord(kPayload2));
+
+ absl::Status empty_status(absl::StatusCode::kInternal, "");
+
+ // Different payloads, not equal
+ EXPECT_NE(payload_status, empty_status);
+ EXPECT_TRUE(payload_status.ErasePayload(kUrl1));
+
+ // Still Different payloads, still not equal.
+ EXPECT_NE(payload_status, empty_status);
+ EXPECT_TRUE(payload_status.ErasePayload(kUrl2));
+
+ // Both empty payloads, should be equal
+ EXPECT_EQ(payload_status, empty_status);
+}
+
+PayloadsVec AllVisitedPayloads(const absl::Status& s) {
+ PayloadsVec result;
+
+ s.ForEachPayload([&](absl::string_view type_url, const absl::Cord& payload) {
+ result.push_back(std::make_pair(std::string(type_url), payload));
+ });
+
+ return result;
+}
+
+TEST(Status, TestForEachPayload) {
+ absl::Status bad_status(absl::StatusCode::kInternal, "fail");
+ bad_status.SetPayload(kUrl1, absl::Cord(kPayload1));
+ bad_status.SetPayload(kUrl2, absl::Cord(kPayload2));
+ bad_status.SetPayload(kUrl3, absl::Cord(kPayload3));
+
+ int count = 0;
+
+ bad_status.ForEachPayload(
+ [&count](absl::string_view, const absl::Cord&) { ++count; });
+
+ EXPECT_EQ(count, 3);
+
+ PayloadsVec expected_payloads = {{kUrl1, absl::Cord(kPayload1)},
+ {kUrl2, absl::Cord(kPayload2)},
+ {kUrl3, absl::Cord(kPayload3)}};
+
+ // Test that we visit all the payloads in the status.
+ PayloadsVec visited_payloads = AllVisitedPayloads(bad_status);
+ EXPECT_THAT(visited_payloads, UnorderedElementsAreArray(expected_payloads));
+
+ // Test that visitation order is not consistent between run.
+ std::vector<absl::Status> scratch;
+ while (true) {
+ scratch.emplace_back(absl::StatusCode::kInternal, "fail");
+
+ scratch.back().SetPayload(kUrl1, absl::Cord(kPayload1));
+ scratch.back().SetPayload(kUrl2, absl::Cord(kPayload2));
+ scratch.back().SetPayload(kUrl3, absl::Cord(kPayload3));
+
+ if (AllVisitedPayloads(scratch.back()) != visited_payloads) {
+ break;
+ }
+ }
+}
+
+TEST(Status, ToString) {
+ absl::Status s(absl::StatusCode::kInternal, "fail");
+ EXPECT_EQ("INTERNAL: fail", s.ToString());
+ s.SetPayload("foo", absl::Cord("bar"));
+ EXPECT_EQ("INTERNAL: fail [foo='bar']", s.ToString());
+ s.SetPayload("bar", absl::Cord("\377"));
+ EXPECT_THAT(s.ToString(),
+ AllOf(HasSubstr("INTERNAL: fail"), HasSubstr("[foo='bar']"),
+ HasSubstr("[bar='\\xff']")));
+}
+
+absl::Status EraseAndReturn(const absl::Status& base) {
+ absl::Status copy = base;
+ EXPECT_TRUE(copy.ErasePayload(kUrl1));
+ return copy;
+}
+
+TEST(Status, CopyOnWriteForErasePayload) {
+ {
+ absl::Status base(absl::StatusCode::kInvalidArgument, "fail");
+ base.SetPayload(kUrl1, absl::Cord(kPayload1));
+ EXPECT_TRUE(base.GetPayload(kUrl1).has_value());
+ absl::Status copy = EraseAndReturn(base);
+ EXPECT_TRUE(base.GetPayload(kUrl1).has_value());
+ EXPECT_FALSE(copy.GetPayload(kUrl1).has_value());
+ }
+ {
+ absl::Status base(absl::StatusCode::kInvalidArgument, "fail");
+ base.SetPayload(kUrl1, absl::Cord(kPayload1));
+ absl::Status copy = base;
+
+ EXPECT_TRUE(base.GetPayload(kUrl1).has_value());
+ EXPECT_TRUE(copy.GetPayload(kUrl1).has_value());
+
+ EXPECT_TRUE(base.ErasePayload(kUrl1));
+
+ EXPECT_FALSE(base.GetPayload(kUrl1).has_value());
+ EXPECT_TRUE(copy.GetPayload(kUrl1).has_value());
+ }
+}
+
+TEST(Status, CopyConstructor) {
+ {
+ absl::Status status;
+ absl::Status copy(status);
+ EXPECT_EQ(copy, status);
+ }
+ {
+ absl::Status status(absl::StatusCode::kInvalidArgument, "message");
+ absl::Status copy(status);
+ EXPECT_EQ(copy, status);
+ }
+ {
+ absl::Status status(absl::StatusCode::kInvalidArgument, "message");
+ status.SetPayload(kUrl1, absl::Cord(kPayload1));
+ absl::Status copy(status);
+ EXPECT_EQ(copy, status);
+ }
+}
+
+TEST(Status, CopyAssignment) {
+ absl::Status assignee;
+ {
+ absl::Status status;
+ assignee = status;
+ EXPECT_EQ(assignee, status);
+ }
+ {
+ absl::Status status(absl::StatusCode::kInvalidArgument, "message");
+ assignee = status;
+ EXPECT_EQ(assignee, status);
+ }
+ {
+ absl::Status status(absl::StatusCode::kInvalidArgument, "message");
+ status.SetPayload(kUrl1, absl::Cord(kPayload1));
+ assignee = status;
+ EXPECT_EQ(assignee, status);
+ }
+}
+
+TEST(Status, CopyAssignmentIsNotRef) {
+ const absl::Status status_orig(absl::StatusCode::kInvalidArgument, "message");
+ absl::Status status_copy = status_orig;
+ EXPECT_EQ(status_orig, status_copy);
+ status_copy.SetPayload(kUrl1, absl::Cord(kPayload1));
+ EXPECT_NE(status_orig, status_copy);
+}
+
+TEST(Status, MoveConstructor) {
+ {
+ absl::Status status;
+ absl::Status copy(absl::Status{});
+ EXPECT_EQ(copy, status);
+ }
+ {
+ absl::Status status(absl::StatusCode::kInvalidArgument, "message");
+ absl::Status copy(
+ absl::Status(absl::StatusCode::kInvalidArgument, "message"));
+ EXPECT_EQ(copy, status);
+ }
+ {
+ absl::Status status(absl::StatusCode::kInvalidArgument, "message");
+ status.SetPayload(kUrl1, absl::Cord(kPayload1));
+ absl::Status copy1(status);
+ absl::Status copy2(std::move(status));
+ EXPECT_EQ(copy1, copy2);
+ }
+}
+
+TEST(Status, MoveAssignment) {
+ absl::Status assignee;
+ {
+ absl::Status status;
+ assignee = absl::Status();
+ EXPECT_EQ(assignee, status);
+ }
+ {
+ absl::Status status(absl::StatusCode::kInvalidArgument, "message");
+ assignee = absl::Status(absl::StatusCode::kInvalidArgument, "message");
+ EXPECT_EQ(assignee, status);
+ }
+ {
+ absl::Status status(absl::StatusCode::kInvalidArgument, "message");
+ status.SetPayload(kUrl1, absl::Cord(kPayload1));
+ absl::Status copy(status);
+ assignee = std::move(status);
+ EXPECT_EQ(assignee, copy);
+ }
+}
+
+TEST(Status, Update) {
+ absl::Status s;
+ s.Update(absl::OkStatus());
+ EXPECT_TRUE(s.ok());
+ const absl::Status a(absl::StatusCode::kCancelled, "message");
+ s.Update(a);
+ EXPECT_EQ(s, a);
+ const absl::Status b(absl::StatusCode::kInternal, "other message");
+ s.Update(b);
+ EXPECT_EQ(s, a);
+ s.Update(absl::OkStatus());
+ EXPECT_EQ(s, a);
+ EXPECT_FALSE(s.ok());
+}
+
+TEST(Status, Equality) {
+ absl::Status ok;
+ absl::Status no_payload = absl::CancelledError("no payload");
+ absl::Status one_payload = absl::InvalidArgumentError("one payload");
+ one_payload.SetPayload(kUrl1, absl::Cord(kPayload1));
+ absl::Status two_payloads = one_payload;
+ two_payloads.SetPayload(kUrl2, absl::Cord(kPayload2));
+ const std::array<absl::Status, 4> status_arr = {ok, no_payload, one_payload,
+ two_payloads};
+ for (int i = 0; i < status_arr.size(); i++) {
+ for (int j = 0; j < status_arr.size(); j++) {
+ if (i == j) {
+ EXPECT_TRUE(status_arr[i] == status_arr[j]);
+ EXPECT_FALSE(status_arr[i] != status_arr[j]);
+ } else {
+ EXPECT_TRUE(status_arr[i] != status_arr[j]);
+ EXPECT_FALSE(status_arr[i] == status_arr[j]);
+ }
+ }
+ }
+}
+
+TEST(Status, Swap) {
+ auto test_swap = [](const absl::Status& s1, const absl::Status& s2) {
+ absl::Status copy1 = s1, copy2 = s2;
+ swap(copy1, copy2);
+ EXPECT_EQ(copy1, s2);
+ EXPECT_EQ(copy2, s1);
+ };
+ const absl::Status ok;
+ const absl::Status no_payload(absl::StatusCode::kAlreadyExists, "no payload");
+ absl::Status with_payload(absl::StatusCode::kInternal, "with payload");
+ with_payload.SetPayload(kUrl1, absl::Cord(kPayload1));
+ test_swap(ok, no_payload);
+ test_swap(no_payload, ok);
+ test_swap(ok, with_payload);
+ test_swap(with_payload, ok);
+ test_swap(no_payload, with_payload);
+ test_swap(with_payload, no_payload);
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/status/statusor.cc b/third_party/abseil/src/absl/status/statusor.cc
new file mode 100644
index 0000000..b954b45
--- /dev/null
+++ b/third_party/abseil/src/absl/status/statusor.cc
@@ -0,0 +1,71 @@
+// Copyright 2020 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+#include "absl/status/statusor.h"
+
+#include <cstdlib>
+#include <utility>
+
+#include "absl/base/internal/raw_logging.h"
+#include "absl/status/status.h"
+#include "absl/strings/str_cat.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+BadStatusOrAccess::BadStatusOrAccess(absl::Status status)
+ : status_(std::move(status)) {}
+
+BadStatusOrAccess::~BadStatusOrAccess() = default;
+const char* BadStatusOrAccess::what() const noexcept {
+ return "Bad StatusOr access";
+}
+
+const absl::Status& BadStatusOrAccess::status() const { return status_; }
+
+namespace internal_statusor {
+
+void Helper::HandleInvalidStatusCtorArg(absl::Status* status) {
+ const char* kMessage =
+ "An OK status is not a valid constructor argument to StatusOr<T>";
+#ifdef NDEBUG
+ ABSL_INTERNAL_LOG(ERROR, kMessage);
+#else
+ ABSL_INTERNAL_LOG(FATAL, kMessage);
+#endif
+ // In optimized builds, we will fall back to InternalError.
+ *status = absl::InternalError(kMessage);
+}
+
+void Helper::Crash(const absl::Status& status) {
+ ABSL_INTERNAL_LOG(
+ FATAL,
+ absl::StrCat("Attempting to fetch value instead of handling error ",
+ status.ToString()));
+}
+
+void ThrowBadStatusOrAccess(absl::Status status) {
+#ifdef ABSL_HAVE_EXCEPTIONS
+ throw absl::BadStatusOrAccess(std::move(status));
+#else
+ ABSL_INTERNAL_LOG(
+ FATAL,
+ absl::StrCat("Attempting to fetch value instead of handling error ",
+ status.ToString()));
+ std::abort();
+#endif
+}
+
+} // namespace internal_statusor
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/status/statusor.h b/third_party/abseil/src/absl/status/statusor.h
new file mode 100644
index 0000000..469d486
--- /dev/null
+++ b/third_party/abseil/src/absl/status/statusor.h
@@ -0,0 +1,760 @@
+// Copyright 2020 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: statusor.h
+// -----------------------------------------------------------------------------
+//
+// An `absl::StatusOr<T>` represents a union of an `absl::Status` object
+// and an object of type `T`. The `absl::StatusOr<T>` will either contain an
+// object of type `T` (indicating a successful operation), or an error (of type
+// `absl::Status`) explaining why such a value is not present.
+//
+// In general, check the success of an operation returning an
+// `absl::StatusOr<T>` like you would an `absl::Status` by using the `ok()`
+// member function.
+//
+// Example:
+//
+// StatusOr<Foo> result = Calculation();
+// if (result.ok()) {
+// result->DoSomethingCool();
+// } else {
+// LOG(ERROR) << result.status();
+// }
+#ifndef ABSL_STATUS_STATUSOR_H_
+#define ABSL_STATUS_STATUSOR_H_
+
+#include <exception>
+#include <initializer_list>
+#include <new>
+#include <string>
+#include <type_traits>
+#include <utility>
+
+#include "absl/base/attributes.h"
+#include "absl/meta/type_traits.h"
+#include "absl/status/internal/statusor_internal.h"
+#include "absl/status/status.h"
+#include "absl/types/variant.h"
+#include "absl/utility/utility.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+// BadStatusOrAccess
+//
+// This class defines the type of object to throw (if exceptions are enabled),
+// when accessing the value of an `absl::StatusOr<T>` object that does not
+// contain a value. This behavior is analogous to that of
+// `std::bad_optional_access` in the case of accessing an invalid
+// `std::optional` value.
+//
+// Example:
+//
+// try {
+// absl::StatusOr<int> v = FetchInt();
+// DoWork(v.value()); // Accessing value() when not "OK" may throw
+// } catch (absl::BadStatusOrAccess& ex) {
+// LOG(ERROR) << ex.status();
+// }
+class BadStatusOrAccess : public std::exception {
+ public:
+ explicit BadStatusOrAccess(absl::Status status);
+ ~BadStatusOrAccess() override;
+
+ // BadStatusOrAccess::what()
+ //
+ // Returns the associated explanatory string of the `absl::StatusOr<T>`
+ // object's error code. This function only returns the string literal "Bad
+ // StatusOr Access" for cases when evaluating general exceptions.
+ //
+ // The pointer of this string is guaranteed to be valid until any non-const
+ // function is invoked on the exception object.
+ const char* what() const noexcept override;
+
+ // BadStatusOrAccess::status()
+ //
+ // Returns the associated `absl::Status` of the `absl::StatusOr<T>` object's
+ // error.
+ const absl::Status& status() const;
+
+ private:
+ absl::Status status_;
+};
+
+// Returned StatusOr objects may not be ignored.
+template <typename T>
+class ABSL_MUST_USE_RESULT StatusOr;
+
+// absl::StatusOr<T>
+//
+// The `absl::StatusOr<T>` class template is a union of an `absl::Status` object
+// and an object of type `T`. The `absl::StatusOr<T>` models an object that is
+// either a usable object, or an error (of type `absl::Status`) explaining why
+// such an object is not present. An `absl::StatusOr<T>` is typically the return
+// value of a function which may fail.
+//
+// An `absl::StatusOr<T>` can never hold an "OK" status (an
+// `absl::StatusCode::kOk` value); instead, the presence of an object of type
+// `T` indicates success. Instead of checking for a `kOk` value, use the
+// `absl::StatusOr<T>::ok()` member function. (It is for this reason, and code
+// readability, that using the `ok()` function is preferred for `absl::Status`
+// as well.)
+//
+// Example:
+//
+// StatusOr<Foo> result = DoBigCalculationThatCouldFail();
+// if (result.ok()) {
+// result->DoSomethingCool();
+// } else {
+// LOG(ERROR) << result.status();
+// }
+//
+// Accessing the object held by an `absl::StatusOr<T>` should be performed via
+// `operator*` or `operator->`, after a call to `ok()` confirms that the
+// `absl::StatusOr<T>` holds an object of type `T`:
+//
+// Example:
+//
+// absl::StatusOr<int> i = GetCount();
+// if (i.ok()) {
+// updated_total += *i
+// }
+//
+// NOTE: using `absl::StatusOr<T>::value()` when no valid value is present will
+// throw an exception if exceptions are enabled or terminate the process when
+// execeptions are not enabled.
+//
+// Example:
+//
+// StatusOr<Foo> result = DoBigCalculationThatCouldFail();
+// const Foo& foo = result.value(); // Crash/exception if no value present
+// foo.DoSomethingCool();
+//
+// A `absl::StatusOr<T*>` can be constructed from a null pointer like any other
+// pointer value, and the result will be that `ok()` returns `true` and
+// `value()` returns `nullptr`. Checking the value of pointer in an
+// `absl::StatusOr<T>` generally requires a bit more care, to ensure both that a
+// value is present and that value is not null:
+//
+// StatusOr<std::unique_ptr<Foo>> result = FooFactory::MakeNewFoo(arg);
+// if (!result.ok()) {
+// LOG(ERROR) << result.status();
+// } else if (*result == nullptr) {
+// LOG(ERROR) << "Unexpected null pointer";
+// } else {
+// (*result)->DoSomethingCool();
+// }
+//
+// Example factory implementation returning StatusOr<T>:
+//
+// StatusOr<Foo> FooFactory::MakeFoo(int arg) {
+// if (arg <= 0) {
+// return absl::Status(absl::StatusCode::kInvalidArgument,
+// "Arg must be positive");
+// }
+// return Foo(arg);
+// }
+template <typename T>
+class StatusOr : private internal_statusor::StatusOrData<T>,
+ private internal_statusor::CopyCtorBase<T>,
+ private internal_statusor::MoveCtorBase<T>,
+ private internal_statusor::CopyAssignBase<T>,
+ private internal_statusor::MoveAssignBase<T> {
+ template <typename U>
+ friend class StatusOr;
+
+ typedef internal_statusor::StatusOrData<T> Base;
+
+ public:
+ // StatusOr<T>::value_type
+ //
+ // This instance data provides a generic `value_type` member for use within
+ // generic programming. This usage is analogous to that of
+ // `optional::value_type` in the case of `std::optional`.
+ typedef T value_type;
+
+ // Constructors
+
+ // Constructs a new `absl::StatusOr` with an `absl::StatusCode::kUnknown`
+ // status. This constructor is marked 'explicit' to prevent usages in return
+ // values such as 'return {};', under the misconception that
+ // `absl::StatusOr<std::vector<int>>` will be initialized with an empty
+ // vector, instead of an `absl::StatusCode::kUnknown` error code.
+ explicit StatusOr();
+
+ // `StatusOr<T>` is copy constructible if `T` is copy constructible.
+ StatusOr(const StatusOr&) = default;
+ // `StatusOr<T>` is copy assignable if `T` is copy constructible and copy
+ // assignable.
+ StatusOr& operator=(const StatusOr&) = default;
+
+ // `StatusOr<T>` is move constructible if `T` is move constructible.
+ StatusOr(StatusOr&&) = default;
+ // `StatusOr<T>` is moveAssignable if `T` is move constructible and move
+ // assignable.
+ StatusOr& operator=(StatusOr&&) = default;
+
+ // Converting Constructors
+
+ // Constructs a new `absl::StatusOr<T>` from an `absl::StatusOr<U>`, when `T`
+ // is constructible from `U`. To avoid ambiguity, these constructors are
+ // disabled if `T` is also constructible from `StatusOr<U>.`. This constructor
+ // is explicit if and only if the corresponding construction of `T` from `U`
+ // is explicit. (This constructor inherits its explicitness from the
+ // underlying constructor.)
+ template <
+ typename U,
+ absl::enable_if_t<
+ absl::conjunction<
+ absl::negation<std::is_same<T, U>>,
+ std::is_constructible<T, const U&>,
+ std::is_convertible<const U&, T>,
+ absl::negation<
+ internal_statusor::IsConstructibleOrConvertibleFromStatusOr<
+ T, U>>>::value,
+ int> = 0>
+ StatusOr(const StatusOr<U>& other) // NOLINT
+ : Base(static_cast<const typename StatusOr<U>::Base&>(other)) {}
+ template <
+ typename U,
+ absl::enable_if_t<
+ absl::conjunction<
+ absl::negation<std::is_same<T, U>>,
+ std::is_constructible<T, const U&>,
+ absl::negation<std::is_convertible<const U&, T>>,
+ absl::negation<
+ internal_statusor::IsConstructibleOrConvertibleFromStatusOr<
+ T, U>>>::value,
+ int> = 0>
+ explicit StatusOr(const StatusOr<U>& other)
+ : Base(static_cast<const typename StatusOr<U>::Base&>(other)) {}
+
+ template <
+ typename U,
+ absl::enable_if_t<
+ absl::conjunction<
+ absl::negation<std::is_same<T, U>>, std::is_constructible<T, U&&>,
+ std::is_convertible<U&&, T>,
+ absl::negation<
+ internal_statusor::IsConstructibleOrConvertibleFromStatusOr<
+ T, U>>>::value,
+ int> = 0>
+ StatusOr(StatusOr<U>&& other) // NOLINT
+ : Base(static_cast<typename StatusOr<U>::Base&&>(other)) {}
+ template <
+ typename U,
+ absl::enable_if_t<
+ absl::conjunction<
+ absl::negation<std::is_same<T, U>>, std::is_constructible<T, U&&>,
+ absl::negation<std::is_convertible<U&&, T>>,
+ absl::negation<
+ internal_statusor::IsConstructibleOrConvertibleFromStatusOr<
+ T, U>>>::value,
+ int> = 0>
+ explicit StatusOr(StatusOr<U>&& other)
+ : Base(static_cast<typename StatusOr<U>::Base&&>(other)) {}
+
+ // Converting Assignment Operators
+
+ // Creates an `absl::StatusOr<T>` through assignment from an
+ // `absl::StatusOr<U>` when:
+ //
+ // * Both `absl::StatusOr<T>` and `absl::StatusOr<U>` are OK by assigning
+ // `U` to `T` directly.
+ // * `absl::StatusOr<T>` is OK and `absl::StatusOr<U>` contains an error
+ // code by destroying `absl::StatusOr<T>`'s value and assigning from
+ // `absl::StatusOr<U>'
+ // * `absl::StatusOr<T>` contains an error code and `absl::StatusOr<U>` is
+ // OK by directly initializing `T` from `U`.
+ // * Both `absl::StatusOr<T>` and `absl::StatusOr<U>` contain an error
+ // code by assigning the `Status` in `absl::StatusOr<U>` to
+ // `absl::StatusOr<T>`
+ //
+ // These overloads only apply if `absl::StatusOr<T>` is constructible and
+ // assignable from `absl::StatusOr<U>` and `StatusOr<T>` cannot be directly
+ // assigned from `StatusOr<U>`.
+ template <
+ typename U,
+ absl::enable_if_t<
+ absl::conjunction<
+ absl::negation<std::is_same<T, U>>,
+ std::is_constructible<T, const U&>,
+ std::is_assignable<T, const U&>,
+ absl::negation<
+ internal_statusor::
+ IsConstructibleOrConvertibleOrAssignableFromStatusOr<
+ T, U>>>::value,
+ int> = 0>
+ StatusOr& operator=(const StatusOr<U>& other) {
+ this->Assign(other);
+ return *this;
+ }
+ template <
+ typename U,
+ absl::enable_if_t<
+ absl::conjunction<
+ absl::negation<std::is_same<T, U>>, std::is_constructible<T, U&&>,
+ std::is_assignable<T, U&&>,
+ absl::negation<
+ internal_statusor::
+ IsConstructibleOrConvertibleOrAssignableFromStatusOr<
+ T, U>>>::value,
+ int> = 0>
+ StatusOr& operator=(StatusOr<U>&& other) {
+ this->Assign(std::move(other));
+ return *this;
+ }
+
+ // Constructs a new `absl::StatusOr<T>` with a non-ok status. After calling
+ // this constructor, `this->ok()` will be `false` and calls to `value()` will
+ // crash, or produce an exception if exceptions are enabled.
+ //
+ // The constructor also takes any type `U` that is convertible to
+ // `absl::Status`. This constructor is explicit if an only if `U` is not of
+ // type `absl::Status` and the conversion from `U` to `Status` is explicit.
+ //
+ // REQUIRES: !Status(std::forward<U>(v)).ok(). This requirement is DCHECKed.
+ // In optimized builds, passing absl::OkStatus() here will have the effect
+ // of passing absl::StatusCode::kInternal as a fallback.
+ template <
+ typename U = absl::Status,
+ absl::enable_if_t<
+ absl::conjunction<
+ std::is_convertible<U&&, absl::Status>,
+ std::is_constructible<absl::Status, U&&>,
+ absl::negation<std::is_same<absl::decay_t<U>, absl::StatusOr<T>>>,
+ absl::negation<std::is_same<absl::decay_t<U>, T>>,
+ absl::negation<std::is_same<absl::decay_t<U>, absl::in_place_t>>,
+ absl::negation<internal_statusor::HasConversionOperatorToStatusOr<
+ T, U&&>>>::value,
+ int> = 0>
+ StatusOr(U&& v) : Base(std::forward<U>(v)) {}
+
+ template <
+ typename U = absl::Status,
+ absl::enable_if_t<
+ absl::conjunction<
+ absl::negation<std::is_convertible<U&&, absl::Status>>,
+ std::is_constructible<absl::Status, U&&>,
+ absl::negation<std::is_same<absl::decay_t<U>, absl::StatusOr<T>>>,
+ absl::negation<std::is_same<absl::decay_t<U>, T>>,
+ absl::negation<std::is_same<absl::decay_t<U>, absl::in_place_t>>,
+ absl::negation<internal_statusor::HasConversionOperatorToStatusOr<
+ T, U&&>>>::value,
+ int> = 0>
+ explicit StatusOr(U&& v) : Base(std::forward<U>(v)) {}
+
+ template <
+ typename U = absl::Status,
+ absl::enable_if_t<
+ absl::conjunction<
+ std::is_convertible<U&&, absl::Status>,
+ std::is_constructible<absl::Status, U&&>,
+ absl::negation<std::is_same<absl::decay_t<U>, absl::StatusOr<T>>>,
+ absl::negation<std::is_same<absl::decay_t<U>, T>>,
+ absl::negation<std::is_same<absl::decay_t<U>, absl::in_place_t>>,
+ absl::negation<internal_statusor::HasConversionOperatorToStatusOr<
+ T, U&&>>>::value,
+ int> = 0>
+ StatusOr& operator=(U&& v) {
+ this->AssignStatus(std::forward<U>(v));
+ return *this;
+ }
+
+ // Perfect-forwarding value assignment operator.
+
+ // If `*this` contains a `T` value before the call, the contained value is
+ // assigned from `std::forward<U>(v)`; Otherwise, it is directly-initialized
+ // from `std::forward<U>(v)`.
+ // This function does not participate in overload unless:
+ // 1. `std::is_constructible_v<T, U>` is true,
+ // 2. `std::is_assignable_v<T&, U>` is true.
+ // 3. `std::is_same_v<StatusOr<T>, std::remove_cvref_t<U>>` is false.
+ // 4. Assigning `U` to `T` is not ambiguous:
+ // If `U` is `StatusOr<V>` and `T` is constructible and assignable from
+ // both `StatusOr<V>` and `V`, the assignment is considered bug-prone and
+ // ambiguous thus will fail to compile. For example:
+ // StatusOr<bool> s1 = true; // s1.ok() && *s1 == true
+ // StatusOr<bool> s2 = false; // s2.ok() && *s2 == false
+ // s1 = s2; // ambiguous, `s1 = *s2` or `s1 = bool(s2)`?
+ template <
+ typename U = T,
+ typename = typename std::enable_if<absl::conjunction<
+ std::is_constructible<T, U&&>, std::is_assignable<T&, U&&>,
+ absl::disjunction<
+ std::is_same<absl::remove_cv_t<absl::remove_reference_t<U>>, T>,
+ absl::conjunction<
+ absl::negation<std::is_convertible<U&&, absl::Status>>,
+ absl::negation<internal_statusor::
+ HasConversionOperatorToStatusOr<T, U&&>>>>,
+ internal_statusor::IsForwardingAssignmentValid<T, U&&>>::value>::type>
+ StatusOr& operator=(U&& v) {
+ this->Assign(std::forward<U>(v));
+ return *this;
+ }
+
+ // Constructs the inner value `T` in-place using the provided args, using the
+ // `T(args...)` constructor.
+ template <typename... Args>
+ explicit StatusOr(absl::in_place_t, Args&&... args);
+ template <typename U, typename... Args>
+ explicit StatusOr(absl::in_place_t, std::initializer_list<U> ilist,
+ Args&&... args);
+
+ // Constructs the inner value `T` in-place using the provided args, using the
+ // `T(U)` (direct-initialization) constructor. This constructor is only valid
+ // if `T` can be constructed from a `U`. Can accept move or copy constructors.
+ //
+ // This constructor is explicit if `U` is not convertible to `T`. To avoid
+ // ambiguity, this constuctor is disabled if `U` is a `StatusOr<J>`, where `J`
+ // is convertible to `T`.
+ template <
+ typename U = T,
+ absl::enable_if_t<
+ absl::conjunction<
+ internal_statusor::IsDirectInitializationValid<T, U&&>,
+ std::is_constructible<T, U&&>, std::is_convertible<U&&, T>,
+ absl::disjunction<
+ std::is_same<absl::remove_cv_t<absl::remove_reference_t<U>>,
+ T>,
+ absl::conjunction<
+ absl::negation<std::is_convertible<U&&, absl::Status>>,
+ absl::negation<
+ internal_statusor::HasConversionOperatorToStatusOr<
+ T, U&&>>>>>::value,
+ int> = 0>
+ StatusOr(U&& u) // NOLINT
+ : StatusOr(absl::in_place, std::forward<U>(u)) {
+ }
+
+ template <
+ typename U = T,
+ absl::enable_if_t<
+ absl::conjunction<
+ internal_statusor::IsDirectInitializationValid<T, U&&>,
+ absl::disjunction<
+ std::is_same<absl::remove_cv_t<absl::remove_reference_t<U>>,
+ T>,
+ absl::conjunction<
+ absl::negation<std::is_constructible<absl::Status, U&&>>,
+ absl::negation<
+ internal_statusor::HasConversionOperatorToStatusOr<
+ T, U&&>>>>,
+ std::is_constructible<T, U&&>,
+ absl::negation<std::is_convertible<U&&, T>>>::value,
+ int> = 0>
+ explicit StatusOr(U&& u) // NOLINT
+ : StatusOr(absl::in_place, std::forward<U>(u)) {
+ }
+
+ // StatusOr<T>::ok()
+ //
+ // Returns whether or not this `absl::StatusOr<T>` holds a `T` value. This
+ // member function is analagous to `absl::Status::ok()` and should be used
+ // similarly to check the status of return values.
+ //
+ // Example:
+ //
+ // StatusOr<Foo> result = DoBigCalculationThatCouldFail();
+ // if (result.ok()) {
+ // // Handle result
+ // else {
+ // // Handle error
+ // }
+ ABSL_MUST_USE_RESULT bool ok() const { return this->status_.ok(); }
+
+ // StatusOr<T>::status()
+ //
+ // Returns a reference to the current `absl::Status` contained within the
+ // `absl::StatusOr<T>`. If `absl::StatusOr<T>` contains a `T`, then this
+ // function returns `absl::OkStatus()`.
+ const Status& status() const &;
+ Status status() &&;
+
+ // StatusOr<T>::value()
+ //
+ // Returns a reference to the held value if `this->ok()`. Otherwise, throws
+ // `absl::BadStatusOrAccess` if exceptions are enabled, or is guaranteed to
+ // terminate the process if exceptions are disabled.
+ //
+ // If you have already checked the status using `this->ok()`, you probably
+ // want to use `operator*()` or `operator->()` to access the value instead of
+ // `value`.
+ //
+ // Note: for value types that are cheap to copy, prefer simple code:
+ //
+ // T value = statusor.value();
+ //
+ // Otherwise, if the value type is expensive to copy, but can be left
+ // in the StatusOr, simply assign to a reference:
+ //
+ // T& value = statusor.value(); // or `const T&`
+ //
+ // Otherwise, if the value type supports an efficient move, it can be
+ // used as follows:
+ //
+ // T value = std::move(statusor).value();
+ //
+ // The `std::move` on statusor instead of on the whole expression enables
+ // warnings about possible uses of the statusor object after the move.
+ const T& value() const&;
+ T& value() &;
+ const T&& value() const&&;
+ T&& value() &&;
+
+ // StatusOr<T>:: operator*()
+ //
+ // Returns a reference to the current value.
+ //
+ // REQUIRES: `this->ok() == true`, otherwise the behavior is undefined.
+ //
+ // Use `this->ok()` to verify that there is a current value within the
+ // `absl::StatusOr<T>`. Alternatively, see the `value()` member function for a
+ // similar API that guarantees crashing or throwing an exception if there is
+ // no current value.
+ const T& operator*() const&;
+ T& operator*() &;
+ const T&& operator*() const&&;
+ T&& operator*() &&;
+
+ // StatusOr<T>::operator->()
+ //
+ // Returns a pointer to the current value.
+ //
+ // REQUIRES: `this->ok() == true`, otherwise the behavior is undefined.
+ //
+ // Use `this->ok()` to verify that there is a current value.
+ const T* operator->() const;
+ T* operator->();
+
+ // StatusOr<T>::value_or()
+ //
+ // Returns the current value if `this->ok() == true`. Otherwise constructs a
+ // value using the provided `default_value`.
+ //
+ // Unlike `value`, this function returns by value, copying the current value
+ // if necessary. If the value type supports an efficient move, it can be used
+ // as follows:
+ //
+ // T value = std::move(statusor).value_or(def);
+ //
+ // Unlike with `value`, calling `std::move()` on the result of `value_or` will
+ // still trigger a copy.
+ template <typename U>
+ T value_or(U&& default_value) const&;
+ template <typename U>
+ T value_or(U&& default_value) &&;
+
+ // StatusOr<T>::IgnoreError()
+ //
+ // Ignores any errors. This method does nothing except potentially suppress
+ // complaints from any tools that are checking that errors are not dropped on
+ // the floor.
+ void IgnoreError() const;
+
+ // StatusOr<T>::emplace()
+ //
+ // Reconstructs the inner value T in-place using the provided args, using the
+ // T(args...) constructor. Returns reference to the reconstructed `T`.
+ template <typename... Args>
+ T& emplace(Args&&... args) {
+ if (ok()) {
+ this->Clear();
+ this->MakeValue(std::forward<Args>(args)...);
+ } else {
+ this->MakeValue(std::forward<Args>(args)...);
+ this->status_ = absl::OkStatus();
+ }
+ return this->data_;
+ }
+
+ template <
+ typename U, typename... Args,
+ absl::enable_if_t<
+ std::is_constructible<T, std::initializer_list<U>&, Args&&...>::value,
+ int> = 0>
+ T& emplace(std::initializer_list<U> ilist, Args&&... args) {
+ if (ok()) {
+ this->Clear();
+ this->MakeValue(ilist, std::forward<Args>(args)...);
+ } else {
+ this->MakeValue(ilist, std::forward<Args>(args)...);
+ this->status_ = absl::OkStatus();
+ }
+ return this->data_;
+ }
+
+ private:
+ using internal_statusor::StatusOrData<T>::Assign;
+ template <typename U>
+ void Assign(const absl::StatusOr<U>& other);
+ template <typename U>
+ void Assign(absl::StatusOr<U>&& other);
+};
+
+// operator==()
+//
+// This operator checks the equality of two `absl::StatusOr<T>` objects.
+template <typename T>
+bool operator==(const StatusOr<T>& lhs, const StatusOr<T>& rhs) {
+ if (lhs.ok() && rhs.ok()) return *lhs == *rhs;
+ return lhs.status() == rhs.status();
+}
+
+// operator!=()
+//
+// This operator checks the inequality of two `absl::StatusOr<T>` objects.
+template <typename T>
+bool operator!=(const StatusOr<T>& lhs, const StatusOr<T>& rhs) {
+ return !(lhs == rhs);
+}
+
+//------------------------------------------------------------------------------
+// Implementation details for StatusOr<T>
+//------------------------------------------------------------------------------
+
+// TODO(sbenza): avoid the string here completely.
+template <typename T>
+StatusOr<T>::StatusOr() : Base(Status(absl::StatusCode::kUnknown, "")) {}
+
+template <typename T>
+template <typename U>
+inline void StatusOr<T>::Assign(const StatusOr<U>& other) {
+ if (other.ok()) {
+ this->Assign(*other);
+ } else {
+ this->AssignStatus(other.status());
+ }
+}
+
+template <typename T>
+template <typename U>
+inline void StatusOr<T>::Assign(StatusOr<U>&& other) {
+ if (other.ok()) {
+ this->Assign(*std::move(other));
+ } else {
+ this->AssignStatus(std::move(other).status());
+ }
+}
+template <typename T>
+template <typename... Args>
+StatusOr<T>::StatusOr(absl::in_place_t, Args&&... args)
+ : Base(absl::in_place, std::forward<Args>(args)...) {}
+
+template <typename T>
+template <typename U, typename... Args>
+StatusOr<T>::StatusOr(absl::in_place_t, std::initializer_list<U> ilist,
+ Args&&... args)
+ : Base(absl::in_place, ilist, std::forward<Args>(args)...) {}
+
+template <typename T>
+const Status& StatusOr<T>::status() const & { return this->status_; }
+template <typename T>
+Status StatusOr<T>::status() && {
+ return ok() ? OkStatus() : std::move(this->status_);
+}
+
+template <typename T>
+const T& StatusOr<T>::value() const& {
+ if (!this->ok()) internal_statusor::ThrowBadStatusOrAccess(this->status_);
+ return this->data_;
+}
+
+template <typename T>
+T& StatusOr<T>::value() & {
+ if (!this->ok()) internal_statusor::ThrowBadStatusOrAccess(this->status_);
+ return this->data_;
+}
+
+template <typename T>
+const T&& StatusOr<T>::value() const&& {
+ if (!this->ok()) {
+ internal_statusor::ThrowBadStatusOrAccess(std::move(this->status_));
+ }
+ return std::move(this->data_);
+}
+
+template <typename T>
+T&& StatusOr<T>::value() && {
+ if (!this->ok()) {
+ internal_statusor::ThrowBadStatusOrAccess(std::move(this->status_));
+ }
+ return std::move(this->data_);
+}
+
+template <typename T>
+const T& StatusOr<T>::operator*() const& {
+ this->EnsureOk();
+ return this->data_;
+}
+
+template <typename T>
+T& StatusOr<T>::operator*() & {
+ this->EnsureOk();
+ return this->data_;
+}
+
+template <typename T>
+const T&& StatusOr<T>::operator*() const&& {
+ this->EnsureOk();
+ return std::move(this->data_);
+}
+
+template <typename T>
+T&& StatusOr<T>::operator*() && {
+ this->EnsureOk();
+ return std::move(this->data_);
+}
+
+template <typename T>
+const T* StatusOr<T>::operator->() const {
+ this->EnsureOk();
+ return &this->data_;
+}
+
+template <typename T>
+T* StatusOr<T>::operator->() {
+ this->EnsureOk();
+ return &this->data_;
+}
+
+template <typename T>
+template <typename U>
+T StatusOr<T>::value_or(U&& default_value) const& {
+ if (ok()) {
+ return this->data_;
+ }
+ return std::forward<U>(default_value);
+}
+
+template <typename T>
+template <typename U>
+T StatusOr<T>::value_or(U&& default_value) && {
+ if (ok()) {
+ return std::move(this->data_);
+ }
+ return std::forward<U>(default_value);
+}
+
+template <typename T>
+void StatusOr<T>::IgnoreError() const {
+ // no-op
+}
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_STATUS_STATUSOR_H_
diff --git a/third_party/abseil/src/absl/status/statusor_test.cc b/third_party/abseil/src/absl/status/statusor_test.cc
new file mode 100644
index 0000000..c2e8fb7
--- /dev/null
+++ b/third_party/abseil/src/absl/status/statusor_test.cc
@@ -0,0 +1,1811 @@
+// Copyright 2020 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/status/statusor.h"
+
+#include <array>
+#include <initializer_list>
+#include <memory>
+#include <type_traits>
+#include <utility>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/base/casts.h"
+#include "absl/memory/memory.h"
+#include "absl/status/status.h"
+#include "absl/types/any.h"
+#include "absl/utility/utility.h"
+
+namespace {
+
+using ::testing::AllOf;
+using ::testing::AnyWith;
+using ::testing::ElementsAre;
+using ::testing::Field;
+using ::testing::Ne;
+using ::testing::Not;
+using ::testing::Pointee;
+using ::testing::VariantWith;
+
+#ifdef GTEST_HAS_STATUS_MATCHERS
+using ::testing::status::IsOk;
+using ::testing::status::IsOkAndHolds;
+#else // GTEST_HAS_STATUS_MATCHERS
+inline const ::absl::Status& GetStatus(const ::absl::Status& status) {
+ return status;
+}
+
+template <typename T>
+inline const ::absl::Status& GetStatus(const ::absl::StatusOr<T>& status) {
+ return status.status();
+}
+
+// Monomorphic implementation of matcher IsOkAndHolds(m). StatusOrType is a
+// reference to StatusOr<T>.
+template <typename StatusOrType>
+class IsOkAndHoldsMatcherImpl
+ : public ::testing::MatcherInterface<StatusOrType> {
+ public:
+ typedef
+ typename std::remove_reference<StatusOrType>::type::value_type value_type;
+
+ template <typename InnerMatcher>
+ explicit IsOkAndHoldsMatcherImpl(InnerMatcher&& inner_matcher)
+ : inner_matcher_(::testing::SafeMatcherCast<const value_type&>(
+ std::forward<InnerMatcher>(inner_matcher))) {}
+
+ void DescribeTo(std::ostream* os) const override {
+ *os << "is OK and has a value that ";
+ inner_matcher_.DescribeTo(os);
+ }
+
+ void DescribeNegationTo(std::ostream* os) const override {
+ *os << "isn't OK or has a value that ";
+ inner_matcher_.DescribeNegationTo(os);
+ }
+
+ bool MatchAndExplain(
+ StatusOrType actual_value,
+ ::testing::MatchResultListener* result_listener) const override {
+ if (!actual_value.ok()) {
+ *result_listener << "which has status " << actual_value.status();
+ return false;
+ }
+
+ ::testing::StringMatchResultListener inner_listener;
+ const bool matches =
+ inner_matcher_.MatchAndExplain(*actual_value, &inner_listener);
+ const std::string inner_explanation = inner_listener.str();
+ if (!inner_explanation.empty()) {
+ *result_listener << "which contains value "
+ << ::testing::PrintToString(*actual_value) << ", "
+ << inner_explanation;
+ }
+ return matches;
+ }
+
+ private:
+ const ::testing::Matcher<const value_type&> inner_matcher_;
+};
+
+// Implements IsOkAndHolds(m) as a polymorphic matcher.
+template <typename InnerMatcher>
+class IsOkAndHoldsMatcher {
+ public:
+ explicit IsOkAndHoldsMatcher(InnerMatcher inner_matcher)
+ : inner_matcher_(std::move(inner_matcher)) {}
+
+ // Converts this polymorphic matcher to a monomorphic matcher of the
+ // given type. StatusOrType can be either StatusOr<T> or a
+ // reference to StatusOr<T>.
+ template <typename StatusOrType>
+ operator ::testing::Matcher<StatusOrType>() const { // NOLINT
+ return ::testing::Matcher<StatusOrType>(
+ new IsOkAndHoldsMatcherImpl<const StatusOrType&>(inner_matcher_));
+ }
+
+ private:
+ const InnerMatcher inner_matcher_;
+};
+
+// Monomorphic implementation of matcher IsOk() for a given type T.
+// T can be Status, StatusOr<>, or a reference to either of them.
+template <typename T>
+class MonoIsOkMatcherImpl : public ::testing::MatcherInterface<T> {
+ public:
+ void DescribeTo(std::ostream* os) const override { *os << "is OK"; }
+ void DescribeNegationTo(std::ostream* os) const override {
+ *os << "is not OK";
+ }
+ bool MatchAndExplain(T actual_value,
+ ::testing::MatchResultListener*) const override {
+ return GetStatus(actual_value).ok();
+ }
+};
+
+// Implements IsOk() as a polymorphic matcher.
+class IsOkMatcher {
+ public:
+ template <typename T>
+ operator ::testing::Matcher<T>() const { // NOLINT
+ return ::testing::Matcher<T>(new MonoIsOkMatcherImpl<T>());
+ }
+};
+
+// Macros for testing the results of functions that return absl::Status or
+// absl::StatusOr<T> (for any type T).
+#define EXPECT_OK(expression) EXPECT_THAT(expression, IsOk())
+
+// Returns a gMock matcher that matches a StatusOr<> whose status is
+// OK and whose value matches the inner matcher.
+template <typename InnerMatcher>
+IsOkAndHoldsMatcher<typename std::decay<InnerMatcher>::type> IsOkAndHolds(
+ InnerMatcher&& inner_matcher) {
+ return IsOkAndHoldsMatcher<typename std::decay<InnerMatcher>::type>(
+ std::forward<InnerMatcher>(inner_matcher));
+}
+
+// Returns a gMock matcher that matches a Status or StatusOr<> which is OK.
+inline IsOkMatcher IsOk() { return IsOkMatcher(); }
+#endif // GTEST_HAS_STATUS_MATCHERS
+
+struct CopyDetector {
+ CopyDetector() = default;
+ explicit CopyDetector(int xx) : x(xx) {}
+ CopyDetector(CopyDetector&& d) noexcept
+ : x(d.x), copied(false), moved(true) {}
+ CopyDetector(const CopyDetector& d) : x(d.x), copied(true), moved(false) {}
+ CopyDetector& operator=(const CopyDetector& c) {
+ x = c.x;
+ copied = true;
+ moved = false;
+ return *this;
+ }
+ CopyDetector& operator=(CopyDetector&& c) noexcept {
+ x = c.x;
+ copied = false;
+ moved = true;
+ return *this;
+ }
+ int x = 0;
+ bool copied = false;
+ bool moved = false;
+};
+
+testing::Matcher<const CopyDetector&> CopyDetectorHas(int a, bool b, bool c) {
+ return AllOf(Field(&CopyDetector::x, a), Field(&CopyDetector::moved, b),
+ Field(&CopyDetector::copied, c));
+}
+
+class Base1 {
+ public:
+ virtual ~Base1() {}
+ int pad;
+};
+
+class Base2 {
+ public:
+ virtual ~Base2() {}
+ int yetotherpad;
+};
+
+class Derived : public Base1, public Base2 {
+ public:
+ virtual ~Derived() {}
+ int evenmorepad;
+};
+
+class CopyNoAssign {
+ public:
+ explicit CopyNoAssign(int value) : foo(value) {}
+ CopyNoAssign(const CopyNoAssign& other) : foo(other.foo) {}
+ int foo;
+
+ private:
+ const CopyNoAssign& operator=(const CopyNoAssign&);
+};
+
+absl::StatusOr<std::unique_ptr<int>> ReturnUniquePtr() {
+ // Uses implicit constructor from T&&
+ return absl::make_unique<int>(0);
+}
+
+TEST(StatusOr, ElementType) {
+ static_assert(std::is_same<absl::StatusOr<int>::value_type, int>(), "");
+ static_assert(std::is_same<absl::StatusOr<char>::value_type, char>(), "");
+}
+
+TEST(StatusOr, TestMoveOnlyInitialization) {
+ absl::StatusOr<std::unique_ptr<int>> thing(ReturnUniquePtr());
+ ASSERT_TRUE(thing.ok());
+ EXPECT_EQ(0, **thing);
+ int* previous = thing->get();
+
+ thing = ReturnUniquePtr();
+ EXPECT_TRUE(thing.ok());
+ EXPECT_EQ(0, **thing);
+ EXPECT_NE(previous, thing->get());
+}
+
+TEST(StatusOr, TestMoveOnlyValueExtraction) {
+ absl::StatusOr<std::unique_ptr<int>> thing(ReturnUniquePtr());
+ ASSERT_TRUE(thing.ok());
+ std::unique_ptr<int> ptr = *std::move(thing);
+ EXPECT_EQ(0, *ptr);
+
+ thing = std::move(ptr);
+ ptr = std::move(*thing);
+ EXPECT_EQ(0, *ptr);
+}
+
+TEST(StatusOr, TestMoveOnlyInitializationFromTemporaryByValueOrDie) {
+ std::unique_ptr<int> ptr(*ReturnUniquePtr());
+ EXPECT_EQ(0, *ptr);
+}
+
+TEST(StatusOr, TestValueOrDieOverloadForConstTemporary) {
+ static_assert(
+ std::is_same<const int&&,
+ decltype(
+ std::declval<const absl::StatusOr<int>&&>().value())>(),
+ "value() for const temporaries should return const T&&");
+}
+
+TEST(StatusOr, TestMoveOnlyConversion) {
+ absl::StatusOr<std::unique_ptr<const int>> const_thing(ReturnUniquePtr());
+ EXPECT_TRUE(const_thing.ok());
+ EXPECT_EQ(0, **const_thing);
+
+ // Test rvalue converting assignment
+ const int* const_previous = const_thing->get();
+ const_thing = ReturnUniquePtr();
+ EXPECT_TRUE(const_thing.ok());
+ EXPECT_EQ(0, **const_thing);
+ EXPECT_NE(const_previous, const_thing->get());
+}
+
+TEST(StatusOr, TestMoveOnlyVector) {
+ // Sanity check that absl::StatusOr<MoveOnly> works in vector.
+ std::vector<absl::StatusOr<std::unique_ptr<int>>> vec;
+ vec.push_back(ReturnUniquePtr());
+ vec.resize(2);
+ auto another_vec = std::move(vec);
+ EXPECT_EQ(0, **another_vec[0]);
+ EXPECT_EQ(absl::UnknownError(""), another_vec[1].status());
+}
+
+TEST(StatusOr, TestDefaultCtor) {
+ absl::StatusOr<int> thing;
+ EXPECT_FALSE(thing.ok());
+ EXPECT_EQ(thing.status().code(), absl::StatusCode::kUnknown);
+}
+
+TEST(StatusOr, StatusCtorForwards) {
+ absl::Status status(absl::StatusCode::kInternal, "Some error");
+
+ EXPECT_EQ(absl::StatusOr<int>(status).status().message(), "Some error");
+ EXPECT_EQ(status.message(), "Some error");
+
+ EXPECT_EQ(absl::StatusOr<int>(std::move(status)).status().message(),
+ "Some error");
+ EXPECT_NE(status.message(), "Some error");
+}
+
+// Define `EXPECT_DEATH_OR_THROW` to test the behavior of `StatusOr::value`,
+// which either throws `BadStatusOrAccess` or `LOG(FATAL)` based on whether
+// exceptions are enabled.
+#ifdef ABSL_HAVE_EXCEPTIONS
+#define EXPECT_DEATH_OR_THROW(statement, status_) \
+ EXPECT_THROW( \
+ { \
+ try { \
+ statement; \
+ } catch (const absl::BadStatusOrAccess& e) { \
+ EXPECT_EQ(e.status(), status_); \
+ throw; \
+ } \
+ }, \
+ absl::BadStatusOrAccess);
+#else // ABSL_HAVE_EXCEPTIONS
+#define EXPECT_DEATH_OR_THROW(statement, status) \
+ EXPECT_DEATH_IF_SUPPORTED(statement, status.ToString());
+#endif // ABSL_HAVE_EXCEPTIONS
+
+TEST(StatusOrDeathTest, TestDefaultCtorValue) {
+ absl::StatusOr<int> thing;
+ EXPECT_DEATH_OR_THROW(thing.value(), absl::UnknownError(""));
+ const absl::StatusOr<int> thing2;
+ EXPECT_DEATH_OR_THROW(thing2.value(), absl::UnknownError(""));
+}
+
+TEST(StatusOrDeathTest, TestValueNotOk) {
+ absl::StatusOr<int> thing(absl::CancelledError());
+ EXPECT_DEATH_OR_THROW(thing.value(), absl::CancelledError());
+}
+
+TEST(StatusOrDeathTest, TestValueNotOkConst) {
+ const absl::StatusOr<int> thing(absl::UnknownError(""));
+ EXPECT_DEATH_OR_THROW(thing.value(), absl::UnknownError(""));
+}
+
+TEST(StatusOrDeathTest, TestPointerDefaultCtorValue) {
+ absl::StatusOr<int*> thing;
+ EXPECT_DEATH_OR_THROW(thing.value(), absl::UnknownError(""));
+}
+
+TEST(StatusOrDeathTest, TestPointerValueNotOk) {
+ absl::StatusOr<int*> thing(absl::CancelledError());
+ EXPECT_DEATH_OR_THROW(thing.value(), absl::CancelledError());
+}
+
+TEST(StatusOrDeathTest, TestPointerValueNotOkConst) {
+ const absl::StatusOr<int*> thing(absl::CancelledError());
+ EXPECT_DEATH_OR_THROW(thing.value(), absl::CancelledError());
+}
+
+#if GTEST_HAS_DEATH_TEST
+TEST(StatusOrDeathTest, TestStatusCtorStatusOk) {
+ EXPECT_DEBUG_DEATH(
+ {
+ // This will DCHECK
+ absl::StatusOr<int> thing(absl::OkStatus());
+ // In optimized mode, we are actually going to get error::INTERNAL for
+ // status here, rather than crashing, so check that.
+ EXPECT_FALSE(thing.ok());
+ EXPECT_EQ(thing.status().code(), absl::StatusCode::kInternal);
+ },
+ "An OK status is not a valid constructor argument");
+}
+
+TEST(StatusOrDeathTest, TestPointerStatusCtorStatusOk) {
+ EXPECT_DEBUG_DEATH(
+ {
+ absl::StatusOr<int*> thing(absl::OkStatus());
+ // In optimized mode, we are actually going to get error::INTERNAL for
+ // status here, rather than crashing, so check that.
+ EXPECT_FALSE(thing.ok());
+ EXPECT_EQ(thing.status().code(), absl::StatusCode::kInternal);
+ },
+ "An OK status is not a valid constructor argument");
+}
+#endif
+
+TEST(StatusOr, ValueAccessor) {
+ const int kIntValue = 110;
+ {
+ absl::StatusOr<int> status_or(kIntValue);
+ EXPECT_EQ(kIntValue, status_or.value());
+ EXPECT_EQ(kIntValue, std::move(status_or).value());
+ }
+ {
+ absl::StatusOr<CopyDetector> status_or(kIntValue);
+ EXPECT_THAT(status_or,
+ IsOkAndHolds(CopyDetectorHas(kIntValue, false, false)));
+ CopyDetector copy_detector = status_or.value();
+ EXPECT_THAT(copy_detector, CopyDetectorHas(kIntValue, false, true));
+ copy_detector = std::move(status_or).value();
+ EXPECT_THAT(copy_detector, CopyDetectorHas(kIntValue, true, false));
+ }
+}
+
+TEST(StatusOr, BadValueAccess) {
+ const absl::Status kError = absl::CancelledError("message");
+ absl::StatusOr<int> status_or(kError);
+ EXPECT_DEATH_OR_THROW(status_or.value(), kError);
+}
+
+TEST(StatusOr, TestStatusCtor) {
+ absl::StatusOr<int> thing(absl::CancelledError());
+ EXPECT_FALSE(thing.ok());
+ EXPECT_EQ(thing.status().code(), absl::StatusCode::kCancelled);
+}
+
+
+
+TEST(StatusOr, TestValueCtor) {
+ const int kI = 4;
+ const absl::StatusOr<int> thing(kI);
+ EXPECT_TRUE(thing.ok());
+ EXPECT_EQ(kI, *thing);
+}
+
+struct Foo {
+ const int x;
+ explicit Foo(int y) : x(y) {}
+};
+
+TEST(StatusOr, InPlaceConstruction) {
+ EXPECT_THAT(absl::StatusOr<Foo>(absl::in_place, 10),
+ IsOkAndHolds(Field(&Foo::x, 10)));
+}
+
+struct InPlaceHelper {
+ InPlaceHelper(std::initializer_list<int> xs, std::unique_ptr<int> yy)
+ : x(xs), y(std::move(yy)) {}
+ const std::vector<int> x;
+ std::unique_ptr<int> y;
+};
+
+TEST(StatusOr, InPlaceInitListConstruction) {
+ absl::StatusOr<InPlaceHelper> status_or(absl::in_place, {10, 11, 12},
+ absl::make_unique<int>(13));
+ EXPECT_THAT(status_or, IsOkAndHolds(AllOf(
+ Field(&InPlaceHelper::x, ElementsAre(10, 11, 12)),
+ Field(&InPlaceHelper::y, Pointee(13)))));
+}
+
+TEST(StatusOr, Emplace) {
+ absl::StatusOr<Foo> status_or_foo(10);
+ status_or_foo.emplace(20);
+ EXPECT_THAT(status_or_foo, IsOkAndHolds(Field(&Foo::x, 20)));
+ status_or_foo = absl::InvalidArgumentError("msg");
+ EXPECT_FALSE(status_or_foo.ok());
+ EXPECT_EQ(status_or_foo.status().code(), absl::StatusCode::kInvalidArgument);
+ EXPECT_EQ(status_or_foo.status().message(), "msg");
+ status_or_foo.emplace(20);
+ EXPECT_THAT(status_or_foo, IsOkAndHolds(Field(&Foo::x, 20)));
+}
+
+TEST(StatusOr, EmplaceInitializerList) {
+ absl::StatusOr<InPlaceHelper> status_or(absl::in_place, {10, 11, 12},
+ absl::make_unique<int>(13));
+ status_or.emplace({1, 2, 3}, absl::make_unique<int>(4));
+ EXPECT_THAT(status_or,
+ IsOkAndHolds(AllOf(Field(&InPlaceHelper::x, ElementsAre(1, 2, 3)),
+ Field(&InPlaceHelper::y, Pointee(4)))));
+ status_or = absl::InvalidArgumentError("msg");
+ EXPECT_FALSE(status_or.ok());
+ EXPECT_EQ(status_or.status().code(), absl::StatusCode::kInvalidArgument);
+ EXPECT_EQ(status_or.status().message(), "msg");
+ status_or.emplace({1, 2, 3}, absl::make_unique<int>(4));
+ EXPECT_THAT(status_or,
+ IsOkAndHolds(AllOf(Field(&InPlaceHelper::x, ElementsAre(1, 2, 3)),
+ Field(&InPlaceHelper::y, Pointee(4)))));
+}
+
+TEST(StatusOr, TestCopyCtorStatusOk) {
+ const int kI = 4;
+ const absl::StatusOr<int> original(kI);
+ const absl::StatusOr<int> copy(original);
+ EXPECT_OK(copy.status());
+ EXPECT_EQ(*original, *copy);
+}
+
+TEST(StatusOr, TestCopyCtorStatusNotOk) {
+ absl::StatusOr<int> original(absl::CancelledError());
+ absl::StatusOr<int> copy(original);
+ EXPECT_EQ(copy.status().code(), absl::StatusCode::kCancelled);
+}
+
+TEST(StatusOr, TestCopyCtorNonAssignable) {
+ const int kI = 4;
+ CopyNoAssign value(kI);
+ absl::StatusOr<CopyNoAssign> original(value);
+ absl::StatusOr<CopyNoAssign> copy(original);
+ EXPECT_OK(copy.status());
+ EXPECT_EQ(original->foo, copy->foo);
+}
+
+TEST(StatusOr, TestCopyCtorStatusOKConverting) {
+ const int kI = 4;
+ absl::StatusOr<int> original(kI);
+ absl::StatusOr<double> copy(original);
+ EXPECT_OK(copy.status());
+ EXPECT_DOUBLE_EQ(*original, *copy);
+}
+
+TEST(StatusOr, TestCopyCtorStatusNotOkConverting) {
+ absl::StatusOr<int> original(absl::CancelledError());
+ absl::StatusOr<double> copy(original);
+ EXPECT_EQ(copy.status(), original.status());
+}
+
+TEST(StatusOr, TestAssignmentStatusOk) {
+ // Copy assignmment
+ {
+ const auto p = std::make_shared<int>(17);
+ absl::StatusOr<std::shared_ptr<int>> source(p);
+
+ absl::StatusOr<std::shared_ptr<int>> target;
+ target = source;
+
+ ASSERT_TRUE(target.ok());
+ EXPECT_OK(target.status());
+ EXPECT_EQ(p, *target);
+
+ ASSERT_TRUE(source.ok());
+ EXPECT_OK(source.status());
+ EXPECT_EQ(p, *source);
+ }
+
+ // Move asssignment
+ {
+ const auto p = std::make_shared<int>(17);
+ absl::StatusOr<std::shared_ptr<int>> source(p);
+
+ absl::StatusOr<std::shared_ptr<int>> target;
+ target = std::move(source);
+
+ ASSERT_TRUE(target.ok());
+ EXPECT_OK(target.status());
+ EXPECT_EQ(p, *target);
+
+ ASSERT_TRUE(source.ok());
+ EXPECT_OK(source.status());
+ EXPECT_EQ(nullptr, *source);
+ }
+}
+
+TEST(StatusOr, TestAssignmentStatusNotOk) {
+ // Copy assignment
+ {
+ const absl::Status expected = absl::CancelledError();
+ absl::StatusOr<int> source(expected);
+
+ absl::StatusOr<int> target;
+ target = source;
+
+ EXPECT_FALSE(target.ok());
+ EXPECT_EQ(expected, target.status());
+
+ EXPECT_FALSE(source.ok());
+ EXPECT_EQ(expected, source.status());
+ }
+
+ // Move assignment
+ {
+ const absl::Status expected = absl::CancelledError();
+ absl::StatusOr<int> source(expected);
+
+ absl::StatusOr<int> target;
+ target = std::move(source);
+
+ EXPECT_FALSE(target.ok());
+ EXPECT_EQ(expected, target.status());
+
+ EXPECT_FALSE(source.ok());
+ EXPECT_EQ(source.status().code(), absl::StatusCode::kInternal);
+ }
+}
+
+TEST(StatusOr, TestAssignmentStatusOKConverting) {
+ // Copy assignment
+ {
+ const int kI = 4;
+ absl::StatusOr<int> source(kI);
+
+ absl::StatusOr<double> target;
+ target = source;
+
+ ASSERT_TRUE(target.ok());
+ EXPECT_OK(target.status());
+ EXPECT_DOUBLE_EQ(kI, *target);
+
+ ASSERT_TRUE(source.ok());
+ EXPECT_OK(source.status());
+ EXPECT_DOUBLE_EQ(kI, *source);
+ }
+
+ // Move assignment
+ {
+ const auto p = new int(17);
+ absl::StatusOr<std::unique_ptr<int>> source(absl::WrapUnique(p));
+
+ absl::StatusOr<std::shared_ptr<int>> target;
+ target = std::move(source);
+
+ ASSERT_TRUE(target.ok());
+ EXPECT_OK(target.status());
+ EXPECT_EQ(p, target->get());
+
+ ASSERT_TRUE(source.ok());
+ EXPECT_OK(source.status());
+ EXPECT_EQ(nullptr, source->get());
+ }
+}
+
+struct A {
+ int x;
+};
+
+struct ImplicitConstructibleFromA {
+ int x;
+ bool moved;
+ ImplicitConstructibleFromA(const A& a) // NOLINT
+ : x(a.x), moved(false) {}
+ ImplicitConstructibleFromA(A&& a) // NOLINT
+ : x(a.x), moved(true) {}
+};
+
+TEST(StatusOr, ImplicitConvertingConstructor) {
+ EXPECT_THAT(
+ absl::implicit_cast<absl::StatusOr<ImplicitConstructibleFromA>>(
+ absl::StatusOr<A>(A{11})),
+ IsOkAndHolds(AllOf(Field(&ImplicitConstructibleFromA::x, 11),
+ Field(&ImplicitConstructibleFromA::moved, true))));
+ absl::StatusOr<A> a(A{12});
+ EXPECT_THAT(
+ absl::implicit_cast<absl::StatusOr<ImplicitConstructibleFromA>>(a),
+ IsOkAndHolds(AllOf(Field(&ImplicitConstructibleFromA::x, 12),
+ Field(&ImplicitConstructibleFromA::moved, false))));
+}
+
+struct ExplicitConstructibleFromA {
+ int x;
+ bool moved;
+ explicit ExplicitConstructibleFromA(const A& a) : x(a.x), moved(false) {}
+ explicit ExplicitConstructibleFromA(A&& a) : x(a.x), moved(true) {}
+};
+
+TEST(StatusOr, ExplicitConvertingConstructor) {
+ EXPECT_FALSE(
+ (std::is_convertible<const absl::StatusOr<A>&,
+ absl::StatusOr<ExplicitConstructibleFromA>>::value));
+ EXPECT_FALSE(
+ (std::is_convertible<absl::StatusOr<A>&&,
+ absl::StatusOr<ExplicitConstructibleFromA>>::value));
+ EXPECT_THAT(
+ absl::StatusOr<ExplicitConstructibleFromA>(absl::StatusOr<A>(A{11})),
+ IsOkAndHolds(AllOf(Field(&ExplicitConstructibleFromA::x, 11),
+ Field(&ExplicitConstructibleFromA::moved, true))));
+ absl::StatusOr<A> a(A{12});
+ EXPECT_THAT(
+ absl::StatusOr<ExplicitConstructibleFromA>(a),
+ IsOkAndHolds(AllOf(Field(&ExplicitConstructibleFromA::x, 12),
+ Field(&ExplicitConstructibleFromA::moved, false))));
+}
+
+struct ImplicitConstructibleFromBool {
+ ImplicitConstructibleFromBool(bool y) : x(y) {} // NOLINT
+ bool x = false;
+};
+
+struct ConvertibleToBool {
+ explicit ConvertibleToBool(bool y) : x(y) {}
+ operator bool() const { return x; } // NOLINT
+ bool x = false;
+};
+
+TEST(StatusOr, ImplicitBooleanConstructionWithImplicitCasts) {
+ EXPECT_THAT(absl::StatusOr<bool>(absl::StatusOr<ConvertibleToBool>(true)),
+ IsOkAndHolds(true));
+ EXPECT_THAT(absl::StatusOr<bool>(absl::StatusOr<ConvertibleToBool>(false)),
+ IsOkAndHolds(false));
+ EXPECT_THAT(
+ absl::implicit_cast<absl::StatusOr<ImplicitConstructibleFromBool>>(
+ absl::StatusOr<bool>(false)),
+ IsOkAndHolds(Field(&ImplicitConstructibleFromBool::x, false)));
+ EXPECT_FALSE((std::is_convertible<
+ absl::StatusOr<ConvertibleToBool>,
+ absl::StatusOr<ImplicitConstructibleFromBool>>::value));
+}
+
+TEST(StatusOr, BooleanConstructionWithImplicitCasts) {
+ EXPECT_THAT(absl::StatusOr<bool>(absl::StatusOr<ConvertibleToBool>(true)),
+ IsOkAndHolds(true));
+ EXPECT_THAT(absl::StatusOr<bool>(absl::StatusOr<ConvertibleToBool>(false)),
+ IsOkAndHolds(false));
+ EXPECT_THAT(
+ absl::StatusOr<ImplicitConstructibleFromBool>{
+ absl::StatusOr<bool>(false)},
+ IsOkAndHolds(Field(&ImplicitConstructibleFromBool::x, false)));
+ EXPECT_THAT(
+ absl::StatusOr<ImplicitConstructibleFromBool>{
+ absl::StatusOr<bool>(absl::InvalidArgumentError(""))},
+ Not(IsOk()));
+
+ EXPECT_THAT(
+ absl::StatusOr<ImplicitConstructibleFromBool>{
+ absl::StatusOr<ConvertibleToBool>(ConvertibleToBool{false})},
+ IsOkAndHolds(Field(&ImplicitConstructibleFromBool::x, false)));
+ EXPECT_THAT(
+ absl::StatusOr<ImplicitConstructibleFromBool>{
+ absl::StatusOr<ConvertibleToBool>(absl::InvalidArgumentError(""))},
+ Not(IsOk()));
+}
+
+TEST(StatusOr, ConstImplicitCast) {
+ EXPECT_THAT(absl::implicit_cast<absl::StatusOr<bool>>(
+ absl::StatusOr<const bool>(true)),
+ IsOkAndHolds(true));
+ EXPECT_THAT(absl::implicit_cast<absl::StatusOr<bool>>(
+ absl::StatusOr<const bool>(false)),
+ IsOkAndHolds(false));
+ EXPECT_THAT(absl::implicit_cast<absl::StatusOr<const bool>>(
+ absl::StatusOr<bool>(true)),
+ IsOkAndHolds(true));
+ EXPECT_THAT(absl::implicit_cast<absl::StatusOr<const bool>>(
+ absl::StatusOr<bool>(false)),
+ IsOkAndHolds(false));
+ EXPECT_THAT(absl::implicit_cast<absl::StatusOr<const std::string>>(
+ absl::StatusOr<std::string>("foo")),
+ IsOkAndHolds("foo"));
+ EXPECT_THAT(absl::implicit_cast<absl::StatusOr<std::string>>(
+ absl::StatusOr<const std::string>("foo")),
+ IsOkAndHolds("foo"));
+ EXPECT_THAT(
+ absl::implicit_cast<absl::StatusOr<std::shared_ptr<const std::string>>>(
+ absl::StatusOr<std::shared_ptr<std::string>>(
+ std::make_shared<std::string>("foo"))),
+ IsOkAndHolds(Pointee(std::string("foo"))));
+}
+
+TEST(StatusOr, ConstExplicitConstruction) {
+ EXPECT_THAT(absl::StatusOr<bool>(absl::StatusOr<const bool>(true)),
+ IsOkAndHolds(true));
+ EXPECT_THAT(absl::StatusOr<bool>(absl::StatusOr<const bool>(false)),
+ IsOkAndHolds(false));
+ EXPECT_THAT(absl::StatusOr<const bool>(absl::StatusOr<bool>(true)),
+ IsOkAndHolds(true));
+ EXPECT_THAT(absl::StatusOr<const bool>(absl::StatusOr<bool>(false)),
+ IsOkAndHolds(false));
+}
+
+struct ExplicitConstructibleFromInt {
+ int x;
+ explicit ExplicitConstructibleFromInt(int y) : x(y) {}
+};
+
+TEST(StatusOr, ExplicitConstruction) {
+ EXPECT_THAT(absl::StatusOr<ExplicitConstructibleFromInt>(10),
+ IsOkAndHolds(Field(&ExplicitConstructibleFromInt::x, 10)));
+}
+
+TEST(StatusOr, ImplicitConstruction) {
+ // Check implicit casting works.
+ auto status_or =
+ absl::implicit_cast<absl::StatusOr<absl::variant<int, std::string>>>(10);
+ EXPECT_THAT(status_or, IsOkAndHolds(VariantWith<int>(10)));
+}
+
+TEST(StatusOr, ImplicitConstructionFromInitliazerList) {
+ // Note: dropping the explicit std::initializer_list<int> is not supported
+ // by absl::StatusOr or absl::optional.
+ auto status_or =
+ absl::implicit_cast<absl::StatusOr<std::vector<int>>>({{10, 20, 30}});
+ EXPECT_THAT(status_or, IsOkAndHolds(ElementsAre(10, 20, 30)));
+}
+
+TEST(StatusOr, UniquePtrImplicitConstruction) {
+ auto status_or = absl::implicit_cast<absl::StatusOr<std::unique_ptr<Base1>>>(
+ absl::make_unique<Derived>());
+ EXPECT_THAT(status_or, IsOkAndHolds(Ne(nullptr)));
+}
+
+TEST(StatusOr, NestedStatusOrCopyAndMoveConstructorTests) {
+ absl::StatusOr<absl::StatusOr<CopyDetector>> status_or = CopyDetector(10);
+ absl::StatusOr<absl::StatusOr<CopyDetector>> status_error =
+ absl::InvalidArgumentError("foo");
+ EXPECT_THAT(status_or,
+ IsOkAndHolds(IsOkAndHolds(CopyDetectorHas(10, true, false))));
+ absl::StatusOr<absl::StatusOr<CopyDetector>> a = status_or;
+ EXPECT_THAT(a, IsOkAndHolds(IsOkAndHolds(CopyDetectorHas(10, false, true))));
+ absl::StatusOr<absl::StatusOr<CopyDetector>> a_err = status_error;
+ EXPECT_THAT(a_err, Not(IsOk()));
+
+ const absl::StatusOr<absl::StatusOr<CopyDetector>>& cref = status_or;
+ absl::StatusOr<absl::StatusOr<CopyDetector>> b = cref; // NOLINT
+ EXPECT_THAT(b, IsOkAndHolds(IsOkAndHolds(CopyDetectorHas(10, false, true))));
+ const absl::StatusOr<absl::StatusOr<CopyDetector>>& cref_err = status_error;
+ absl::StatusOr<absl::StatusOr<CopyDetector>> b_err = cref_err; // NOLINT
+ EXPECT_THAT(b_err, Not(IsOk()));
+
+ absl::StatusOr<absl::StatusOr<CopyDetector>> c = std::move(status_or);
+ EXPECT_THAT(c, IsOkAndHolds(IsOkAndHolds(CopyDetectorHas(10, true, false))));
+ absl::StatusOr<absl::StatusOr<CopyDetector>> c_err = std::move(status_error);
+ EXPECT_THAT(c_err, Not(IsOk()));
+}
+
+TEST(StatusOr, NestedStatusOrCopyAndMoveAssignment) {
+ absl::StatusOr<absl::StatusOr<CopyDetector>> status_or = CopyDetector(10);
+ absl::StatusOr<absl::StatusOr<CopyDetector>> status_error =
+ absl::InvalidArgumentError("foo");
+ absl::StatusOr<absl::StatusOr<CopyDetector>> a;
+ a = status_or;
+ EXPECT_THAT(a, IsOkAndHolds(IsOkAndHolds(CopyDetectorHas(10, false, true))));
+ a = status_error;
+ EXPECT_THAT(a, Not(IsOk()));
+
+ const absl::StatusOr<absl::StatusOr<CopyDetector>>& cref = status_or;
+ a = cref;
+ EXPECT_THAT(a, IsOkAndHolds(IsOkAndHolds(CopyDetectorHas(10, false, true))));
+ const absl::StatusOr<absl::StatusOr<CopyDetector>>& cref_err = status_error;
+ a = cref_err;
+ EXPECT_THAT(a, Not(IsOk()));
+ a = std::move(status_or);
+ EXPECT_THAT(a, IsOkAndHolds(IsOkAndHolds(CopyDetectorHas(10, true, false))));
+ a = std::move(status_error);
+ EXPECT_THAT(a, Not(IsOk()));
+}
+
+struct Copyable {
+ Copyable() {}
+ Copyable(const Copyable&) {}
+ Copyable& operator=(const Copyable&) { return *this; }
+};
+
+struct MoveOnly {
+ MoveOnly() {}
+ MoveOnly(MoveOnly&&) {}
+ MoveOnly& operator=(MoveOnly&&) { return *this; }
+};
+
+struct NonMovable {
+ NonMovable() {}
+ NonMovable(const NonMovable&) = delete;
+ NonMovable(NonMovable&&) = delete;
+ NonMovable& operator=(const NonMovable&) = delete;
+ NonMovable& operator=(NonMovable&&) = delete;
+};
+
+TEST(StatusOr, CopyAndMoveAbility) {
+ EXPECT_TRUE(std::is_copy_constructible<Copyable>::value);
+ EXPECT_TRUE(std::is_copy_assignable<Copyable>::value);
+ EXPECT_TRUE(std::is_move_constructible<Copyable>::value);
+ EXPECT_TRUE(std::is_move_assignable<Copyable>::value);
+ EXPECT_FALSE(std::is_copy_constructible<MoveOnly>::value);
+ EXPECT_FALSE(std::is_copy_assignable<MoveOnly>::value);
+ EXPECT_TRUE(std::is_move_constructible<MoveOnly>::value);
+ EXPECT_TRUE(std::is_move_assignable<MoveOnly>::value);
+ EXPECT_FALSE(std::is_copy_constructible<NonMovable>::value);
+ EXPECT_FALSE(std::is_copy_assignable<NonMovable>::value);
+ EXPECT_FALSE(std::is_move_constructible<NonMovable>::value);
+ EXPECT_FALSE(std::is_move_assignable<NonMovable>::value);
+}
+
+TEST(StatusOr, StatusOrAnyCopyAndMoveConstructorTests) {
+ absl::StatusOr<absl::any> status_or = CopyDetector(10);
+ absl::StatusOr<absl::any> status_error = absl::InvalidArgumentError("foo");
+ EXPECT_THAT(
+ status_or,
+ IsOkAndHolds(AnyWith<CopyDetector>(CopyDetectorHas(10, true, false))));
+ absl::StatusOr<absl::any> a = status_or;
+ EXPECT_THAT(
+ a, IsOkAndHolds(AnyWith<CopyDetector>(CopyDetectorHas(10, false, true))));
+ absl::StatusOr<absl::any> a_err = status_error;
+ EXPECT_THAT(a_err, Not(IsOk()));
+
+ const absl::StatusOr<absl::any>& cref = status_or;
+ // No lint for no-change copy.
+ absl::StatusOr<absl::any> b = cref; // NOLINT
+ EXPECT_THAT(
+ b, IsOkAndHolds(AnyWith<CopyDetector>(CopyDetectorHas(10, false, true))));
+ const absl::StatusOr<absl::any>& cref_err = status_error;
+ // No lint for no-change copy.
+ absl::StatusOr<absl::any> b_err = cref_err; // NOLINT
+ EXPECT_THAT(b_err, Not(IsOk()));
+
+ absl::StatusOr<absl::any> c = std::move(status_or);
+ EXPECT_THAT(
+ c, IsOkAndHolds(AnyWith<CopyDetector>(CopyDetectorHas(10, true, false))));
+ absl::StatusOr<absl::any> c_err = std::move(status_error);
+ EXPECT_THAT(c_err, Not(IsOk()));
+}
+
+TEST(StatusOr, StatusOrAnyCopyAndMoveAssignment) {
+ absl::StatusOr<absl::any> status_or = CopyDetector(10);
+ absl::StatusOr<absl::any> status_error = absl::InvalidArgumentError("foo");
+ absl::StatusOr<absl::any> a;
+ a = status_or;
+ EXPECT_THAT(
+ a, IsOkAndHolds(AnyWith<CopyDetector>(CopyDetectorHas(10, false, true))));
+ a = status_error;
+ EXPECT_THAT(a, Not(IsOk()));
+
+ const absl::StatusOr<absl::any>& cref = status_or;
+ a = cref;
+ EXPECT_THAT(
+ a, IsOkAndHolds(AnyWith<CopyDetector>(CopyDetectorHas(10, false, true))));
+ const absl::StatusOr<absl::any>& cref_err = status_error;
+ a = cref_err;
+ EXPECT_THAT(a, Not(IsOk()));
+ a = std::move(status_or);
+ EXPECT_THAT(
+ a, IsOkAndHolds(AnyWith<CopyDetector>(CopyDetectorHas(10, true, false))));
+ a = std::move(status_error);
+ EXPECT_THAT(a, Not(IsOk()));
+}
+
+TEST(StatusOr, StatusOrCopyAndMoveTestsConstructor) {
+ absl::StatusOr<CopyDetector> status_or(10);
+ ASSERT_THAT(status_or, IsOkAndHolds(CopyDetectorHas(10, false, false)));
+ absl::StatusOr<CopyDetector> a(status_or);
+ EXPECT_THAT(a, IsOkAndHolds(CopyDetectorHas(10, false, true)));
+ const absl::StatusOr<CopyDetector>& cref = status_or;
+ absl::StatusOr<CopyDetector> b(cref); // NOLINT
+ EXPECT_THAT(b, IsOkAndHolds(CopyDetectorHas(10, false, true)));
+ absl::StatusOr<CopyDetector> c(std::move(status_or));
+ EXPECT_THAT(c, IsOkAndHolds(CopyDetectorHas(10, true, false)));
+}
+
+TEST(StatusOr, StatusOrCopyAndMoveTestsAssignment) {
+ absl::StatusOr<CopyDetector> status_or(10);
+ ASSERT_THAT(status_or, IsOkAndHolds(CopyDetectorHas(10, false, false)));
+ absl::StatusOr<CopyDetector> a;
+ a = status_or;
+ EXPECT_THAT(a, IsOkAndHolds(CopyDetectorHas(10, false, true)));
+ const absl::StatusOr<CopyDetector>& cref = status_or;
+ absl::StatusOr<CopyDetector> b;
+ b = cref;
+ EXPECT_THAT(b, IsOkAndHolds(CopyDetectorHas(10, false, true)));
+ absl::StatusOr<CopyDetector> c;
+ c = std::move(status_or);
+ EXPECT_THAT(c, IsOkAndHolds(CopyDetectorHas(10, true, false)));
+}
+
+TEST(StatusOr, AbslAnyAssignment) {
+ EXPECT_FALSE((std::is_assignable<absl::StatusOr<absl::any>,
+ absl::StatusOr<int>>::value));
+ absl::StatusOr<absl::any> status_or;
+ status_or = absl::InvalidArgumentError("foo");
+ EXPECT_THAT(status_or, Not(IsOk()));
+}
+
+TEST(StatusOr, ImplicitAssignment) {
+ absl::StatusOr<absl::variant<int, std::string>> status_or;
+ status_or = 10;
+ EXPECT_THAT(status_or, IsOkAndHolds(VariantWith<int>(10)));
+}
+
+TEST(StatusOr, SelfDirectInitAssignment) {
+ absl::StatusOr<std::vector<int>> status_or = {{10, 20, 30}};
+ status_or = *status_or;
+ EXPECT_THAT(status_or, IsOkAndHolds(ElementsAre(10, 20, 30)));
+}
+
+TEST(StatusOr, ImplicitCastFromInitializerList) {
+ absl::StatusOr<std::vector<int>> status_or = {{10, 20, 30}};
+ EXPECT_THAT(status_or, IsOkAndHolds(ElementsAre(10, 20, 30)));
+}
+
+TEST(StatusOr, UniquePtrImplicitAssignment) {
+ absl::StatusOr<std::unique_ptr<Base1>> status_or;
+ status_or = absl::make_unique<Derived>();
+ EXPECT_THAT(status_or, IsOkAndHolds(Ne(nullptr)));
+}
+
+TEST(StatusOr, Pointer) {
+ struct A {};
+ struct B : public A {};
+ struct C : private A {};
+
+ EXPECT_TRUE((std::is_constructible<absl::StatusOr<A*>, B*>::value));
+ EXPECT_TRUE((std::is_convertible<B*, absl::StatusOr<A*>>::value));
+ EXPECT_FALSE((std::is_constructible<absl::StatusOr<A*>, C*>::value));
+ EXPECT_FALSE((std::is_convertible<C*, absl::StatusOr<A*>>::value));
+}
+
+TEST(StatusOr, TestAssignmentStatusNotOkConverting) {
+ // Copy assignment
+ {
+ const absl::Status expected = absl::CancelledError();
+ absl::StatusOr<int> source(expected);
+
+ absl::StatusOr<double> target;
+ target = source;
+
+ EXPECT_FALSE(target.ok());
+ EXPECT_EQ(expected, target.status());
+
+ EXPECT_FALSE(source.ok());
+ EXPECT_EQ(expected, source.status());
+ }
+
+ // Move assignment
+ {
+ const absl::Status expected = absl::CancelledError();
+ absl::StatusOr<int> source(expected);
+
+ absl::StatusOr<double> target;
+ target = std::move(source);
+
+ EXPECT_FALSE(target.ok());
+ EXPECT_EQ(expected, target.status());
+
+ EXPECT_FALSE(source.ok());
+ EXPECT_EQ(source.status().code(), absl::StatusCode::kInternal);
+ }
+}
+
+TEST(StatusOr, SelfAssignment) {
+ // Copy-assignment, status OK
+ {
+ // A string long enough that it's likely to defeat any inline representation
+ // optimization.
+ const std::string long_str(128, 'a');
+
+ absl::StatusOr<std::string> so = long_str;
+ so = *&so;
+
+ ASSERT_TRUE(so.ok());
+ EXPECT_OK(so.status());
+ EXPECT_EQ(long_str, *so);
+ }
+
+ // Copy-assignment, error status
+ {
+ absl::StatusOr<int> so = absl::NotFoundError("taco");
+ so = *&so;
+
+ EXPECT_FALSE(so.ok());
+ EXPECT_EQ(so.status().code(), absl::StatusCode::kNotFound);
+ EXPECT_EQ(so.status().message(), "taco");
+ }
+
+ // Move-assignment with copyable type, status OK
+ {
+ absl::StatusOr<int> so = 17;
+
+ // Fool the compiler, which otherwise complains.
+ auto& same = so;
+ so = std::move(same);
+
+ ASSERT_TRUE(so.ok());
+ EXPECT_OK(so.status());
+ EXPECT_EQ(17, *so);
+ }
+
+ // Move-assignment with copyable type, error status
+ {
+ absl::StatusOr<int> so = absl::NotFoundError("taco");
+
+ // Fool the compiler, which otherwise complains.
+ auto& same = so;
+ so = std::move(same);
+
+ EXPECT_FALSE(so.ok());
+ EXPECT_EQ(so.status().code(), absl::StatusCode::kNotFound);
+ EXPECT_EQ(so.status().message(), "taco");
+ }
+
+ // Move-assignment with non-copyable type, status OK
+ {
+ const auto raw = new int(17);
+ absl::StatusOr<std::unique_ptr<int>> so = absl::WrapUnique(raw);
+
+ // Fool the compiler, which otherwise complains.
+ auto& same = so;
+ so = std::move(same);
+
+ ASSERT_TRUE(so.ok());
+ EXPECT_OK(so.status());
+ EXPECT_EQ(raw, so->get());
+ }
+
+ // Move-assignment with non-copyable type, error status
+ {
+ absl::StatusOr<std::unique_ptr<int>> so = absl::NotFoundError("taco");
+
+ // Fool the compiler, which otherwise complains.
+ auto& same = so;
+ so = std::move(same);
+
+ EXPECT_FALSE(so.ok());
+ EXPECT_EQ(so.status().code(), absl::StatusCode::kNotFound);
+ EXPECT_EQ(so.status().message(), "taco");
+ }
+}
+
+// These types form the overload sets of the constructors and the assignment
+// operators of `MockValue`. They distinguish construction from assignment,
+// lvalue from rvalue.
+struct FromConstructibleAssignableLvalue {};
+struct FromConstructibleAssignableRvalue {};
+struct FromImplicitConstructibleOnly {};
+struct FromAssignableOnly {};
+
+// This class is for testing the forwarding value assignments of `StatusOr`.
+// `from_rvalue` indicates whether the constructor or the assignment taking
+// rvalue reference is called. `from_assignment` indicates whether any
+// assignment is called.
+struct MockValue {
+ // Constructs `MockValue` from `FromConstructibleAssignableLvalue`.
+ MockValue(const FromConstructibleAssignableLvalue&) // NOLINT
+ : from_rvalue(false), assigned(false) {}
+ // Constructs `MockValue` from `FromConstructibleAssignableRvalue`.
+ MockValue(FromConstructibleAssignableRvalue&&) // NOLINT
+ : from_rvalue(true), assigned(false) {}
+ // Constructs `MockValue` from `FromImplicitConstructibleOnly`.
+ // `MockValue` is not assignable from `FromImplicitConstructibleOnly`.
+ MockValue(const FromImplicitConstructibleOnly&) // NOLINT
+ : from_rvalue(false), assigned(false) {}
+ // Assigns `FromConstructibleAssignableLvalue`.
+ MockValue& operator=(const FromConstructibleAssignableLvalue&) {
+ from_rvalue = false;
+ assigned = true;
+ return *this;
+ }
+ // Assigns `FromConstructibleAssignableRvalue` (rvalue only).
+ MockValue& operator=(FromConstructibleAssignableRvalue&&) {
+ from_rvalue = true;
+ assigned = true;
+ return *this;
+ }
+ // Assigns `FromAssignableOnly`, but not constructible from
+ // `FromAssignableOnly`.
+ MockValue& operator=(const FromAssignableOnly&) {
+ from_rvalue = false;
+ assigned = true;
+ return *this;
+ }
+ bool from_rvalue;
+ bool assigned;
+};
+
+// operator=(U&&)
+TEST(StatusOr, PerfectForwardingAssignment) {
+ // U == T
+ constexpr int kValue1 = 10, kValue2 = 20;
+ absl::StatusOr<CopyDetector> status_or;
+ CopyDetector lvalue(kValue1);
+ status_or = lvalue;
+ EXPECT_THAT(status_or, IsOkAndHolds(CopyDetectorHas(kValue1, false, true)));
+ status_or = CopyDetector(kValue2);
+ EXPECT_THAT(status_or, IsOkAndHolds(CopyDetectorHas(kValue2, true, false)));
+
+ // U != T
+ EXPECT_TRUE(
+ (std::is_assignable<absl::StatusOr<MockValue>&,
+ const FromConstructibleAssignableLvalue&>::value));
+ EXPECT_TRUE((std::is_assignable<absl::StatusOr<MockValue>&,
+ FromConstructibleAssignableLvalue&&>::value));
+ EXPECT_FALSE(
+ (std::is_assignable<absl::StatusOr<MockValue>&,
+ const FromConstructibleAssignableRvalue&>::value));
+ EXPECT_TRUE((std::is_assignable<absl::StatusOr<MockValue>&,
+ FromConstructibleAssignableRvalue&&>::value));
+ EXPECT_TRUE(
+ (std::is_assignable<absl::StatusOr<MockValue>&,
+ const FromImplicitConstructibleOnly&>::value));
+ EXPECT_FALSE((std::is_assignable<absl::StatusOr<MockValue>&,
+ const FromAssignableOnly&>::value));
+
+ absl::StatusOr<MockValue> from_lvalue(FromConstructibleAssignableLvalue{});
+ EXPECT_FALSE(from_lvalue->from_rvalue);
+ EXPECT_FALSE(from_lvalue->assigned);
+ from_lvalue = FromConstructibleAssignableLvalue{};
+ EXPECT_FALSE(from_lvalue->from_rvalue);
+ EXPECT_TRUE(from_lvalue->assigned);
+
+ absl::StatusOr<MockValue> from_rvalue(FromConstructibleAssignableRvalue{});
+ EXPECT_TRUE(from_rvalue->from_rvalue);
+ EXPECT_FALSE(from_rvalue->assigned);
+ from_rvalue = FromConstructibleAssignableRvalue{};
+ EXPECT_TRUE(from_rvalue->from_rvalue);
+ EXPECT_TRUE(from_rvalue->assigned);
+
+ absl::StatusOr<MockValue> from_implicit_constructible(
+ FromImplicitConstructibleOnly{});
+ EXPECT_FALSE(from_implicit_constructible->from_rvalue);
+ EXPECT_FALSE(from_implicit_constructible->assigned);
+ // construct a temporary `StatusOr` object and invoke the `StatusOr` move
+ // assignment operator.
+ from_implicit_constructible = FromImplicitConstructibleOnly{};
+ EXPECT_FALSE(from_implicit_constructible->from_rvalue);
+ EXPECT_FALSE(from_implicit_constructible->assigned);
+}
+
+TEST(StatusOr, TestStatus) {
+ absl::StatusOr<int> good(4);
+ EXPECT_TRUE(good.ok());
+ absl::StatusOr<int> bad(absl::CancelledError());
+ EXPECT_FALSE(bad.ok());
+ EXPECT_EQ(bad.status().code(), absl::StatusCode::kCancelled);
+}
+
+TEST(StatusOr, OperatorStarRefQualifiers) {
+ static_assert(
+ std::is_same<const int&,
+ decltype(*std::declval<const absl::StatusOr<int>&>())>(),
+ "Unexpected ref-qualifiers");
+ static_assert(
+ std::is_same<int&, decltype(*std::declval<absl::StatusOr<int>&>())>(),
+ "Unexpected ref-qualifiers");
+ static_assert(
+ std::is_same<const int&&,
+ decltype(*std::declval<const absl::StatusOr<int>&&>())>(),
+ "Unexpected ref-qualifiers");
+ static_assert(
+ std::is_same<int&&, decltype(*std::declval<absl::StatusOr<int>&&>())>(),
+ "Unexpected ref-qualifiers");
+}
+
+TEST(StatusOr, OperatorStar) {
+ const absl::StatusOr<std::string> const_lvalue("hello");
+ EXPECT_EQ("hello", *const_lvalue);
+
+ absl::StatusOr<std::string> lvalue("hello");
+ EXPECT_EQ("hello", *lvalue);
+
+ // Note: Recall that std::move() is equivalent to a static_cast to an rvalue
+ // reference type.
+ const absl::StatusOr<std::string> const_rvalue("hello");
+ EXPECT_EQ("hello", *std::move(const_rvalue)); // NOLINT
+
+ absl::StatusOr<std::string> rvalue("hello");
+ EXPECT_EQ("hello", *std::move(rvalue));
+}
+
+TEST(StatusOr, OperatorArrowQualifiers) {
+ static_assert(
+ std::is_same<
+ const int*,
+ decltype(std::declval<const absl::StatusOr<int>&>().operator->())>(),
+ "Unexpected qualifiers");
+ static_assert(
+ std::is_same<
+ int*, decltype(std::declval<absl::StatusOr<int>&>().operator->())>(),
+ "Unexpected qualifiers");
+ static_assert(
+ std::is_same<
+ const int*,
+ decltype(std::declval<const absl::StatusOr<int>&&>().operator->())>(),
+ "Unexpected qualifiers");
+ static_assert(
+ std::is_same<
+ int*, decltype(std::declval<absl::StatusOr<int>&&>().operator->())>(),
+ "Unexpected qualifiers");
+}
+
+TEST(StatusOr, OperatorArrow) {
+ const absl::StatusOr<std::string> const_lvalue("hello");
+ EXPECT_EQ(std::string("hello"), const_lvalue->c_str());
+
+ absl::StatusOr<std::string> lvalue("hello");
+ EXPECT_EQ(std::string("hello"), lvalue->c_str());
+}
+
+TEST(StatusOr, RValueStatus) {
+ absl::StatusOr<int> so(absl::NotFoundError("taco"));
+ const absl::Status s = std::move(so).status();
+
+ EXPECT_EQ(s.code(), absl::StatusCode::kNotFound);
+ EXPECT_EQ(s.message(), "taco");
+
+ // Check that !ok() still implies !status().ok(), even after moving out of the
+ // object. See the note on the rvalue ref-qualified status method.
+ EXPECT_FALSE(so.ok()); // NOLINT
+ EXPECT_FALSE(so.status().ok());
+ EXPECT_EQ(so.status().code(), absl::StatusCode::kInternal);
+ EXPECT_EQ(so.status().message(), "Status accessed after move.");
+}
+
+TEST(StatusOr, TestValue) {
+ const int kI = 4;
+ absl::StatusOr<int> thing(kI);
+ EXPECT_EQ(kI, *thing);
+}
+
+TEST(StatusOr, TestValueConst) {
+ const int kI = 4;
+ const absl::StatusOr<int> thing(kI);
+ EXPECT_EQ(kI, *thing);
+}
+
+TEST(StatusOr, TestPointerDefaultCtor) {
+ absl::StatusOr<int*> thing;
+ EXPECT_FALSE(thing.ok());
+ EXPECT_EQ(thing.status().code(), absl::StatusCode::kUnknown);
+}
+
+
+
+TEST(StatusOr, TestPointerStatusCtor) {
+ absl::StatusOr<int*> thing(absl::CancelledError());
+ EXPECT_FALSE(thing.ok());
+ EXPECT_EQ(thing.status().code(), absl::StatusCode::kCancelled);
+}
+
+TEST(StatusOr, TestPointerValueCtor) {
+ const int kI = 4;
+
+ // Construction from a non-null pointer
+ {
+ absl::StatusOr<const int*> so(&kI);
+ EXPECT_TRUE(so.ok());
+ EXPECT_OK(so.status());
+ EXPECT_EQ(&kI, *so);
+ }
+
+ // Construction from a null pointer constant
+ {
+ absl::StatusOr<const int*> so(nullptr);
+ EXPECT_TRUE(so.ok());
+ EXPECT_OK(so.status());
+ EXPECT_EQ(nullptr, *so);
+ }
+
+ // Construction from a non-literal null pointer
+ {
+ const int* const p = nullptr;
+
+ absl::StatusOr<const int*> so(p);
+ EXPECT_TRUE(so.ok());
+ EXPECT_OK(so.status());
+ EXPECT_EQ(nullptr, *so);
+ }
+}
+
+TEST(StatusOr, TestPointerCopyCtorStatusOk) {
+ const int kI = 0;
+ absl::StatusOr<const int*> original(&kI);
+ absl::StatusOr<const int*> copy(original);
+ EXPECT_OK(copy.status());
+ EXPECT_EQ(*original, *copy);
+}
+
+TEST(StatusOr, TestPointerCopyCtorStatusNotOk) {
+ absl::StatusOr<int*> original(absl::CancelledError());
+ absl::StatusOr<int*> copy(original);
+ EXPECT_EQ(copy.status().code(), absl::StatusCode::kCancelled);
+}
+
+TEST(StatusOr, TestPointerCopyCtorStatusOKConverting) {
+ Derived derived;
+ absl::StatusOr<Derived*> original(&derived);
+ absl::StatusOr<Base2*> copy(original);
+ EXPECT_OK(copy.status());
+ EXPECT_EQ(static_cast<const Base2*>(*original), *copy);
+}
+
+TEST(StatusOr, TestPointerCopyCtorStatusNotOkConverting) {
+ absl::StatusOr<Derived*> original(absl::CancelledError());
+ absl::StatusOr<Base2*> copy(original);
+ EXPECT_EQ(copy.status().code(), absl::StatusCode::kCancelled);
+}
+
+TEST(StatusOr, TestPointerAssignmentStatusOk) {
+ const int kI = 0;
+ absl::StatusOr<const int*> source(&kI);
+ absl::StatusOr<const int*> target;
+ target = source;
+ EXPECT_OK(target.status());
+ EXPECT_EQ(*source, *target);
+}
+
+TEST(StatusOr, TestPointerAssignmentStatusNotOk) {
+ absl::StatusOr<int*> source(absl::CancelledError());
+ absl::StatusOr<int*> target;
+ target = source;
+ EXPECT_EQ(target.status().code(), absl::StatusCode::kCancelled);
+}
+
+TEST(StatusOr, TestPointerAssignmentStatusOKConverting) {
+ Derived derived;
+ absl::StatusOr<Derived*> source(&derived);
+ absl::StatusOr<Base2*> target;
+ target = source;
+ EXPECT_OK(target.status());
+ EXPECT_EQ(static_cast<const Base2*>(*source), *target);
+}
+
+TEST(StatusOr, TestPointerAssignmentStatusNotOkConverting) {
+ absl::StatusOr<Derived*> source(absl::CancelledError());
+ absl::StatusOr<Base2*> target;
+ target = source;
+ EXPECT_EQ(target.status(), source.status());
+}
+
+TEST(StatusOr, TestPointerStatus) {
+ const int kI = 0;
+ absl::StatusOr<const int*> good(&kI);
+ EXPECT_TRUE(good.ok());
+ absl::StatusOr<const int*> bad(absl::CancelledError());
+ EXPECT_EQ(bad.status().code(), absl::StatusCode::kCancelled);
+}
+
+TEST(StatusOr, TestPointerValue) {
+ const int kI = 0;
+ absl::StatusOr<const int*> thing(&kI);
+ EXPECT_EQ(&kI, *thing);
+}
+
+TEST(StatusOr, TestPointerValueConst) {
+ const int kI = 0;
+ const absl::StatusOr<const int*> thing(&kI);
+ EXPECT_EQ(&kI, *thing);
+}
+
+TEST(StatusOr, StatusOrVectorOfUniquePointerCanReserveAndResize) {
+ using EvilType = std::vector<std::unique_ptr<int>>;
+ static_assert(std::is_copy_constructible<EvilType>::value, "");
+ std::vector<::absl::StatusOr<EvilType>> v(5);
+ v.reserve(v.capacity() + 10);
+ v.resize(v.capacity() + 10);
+}
+
+TEST(StatusOr, ConstPayload) {
+ // A reduced version of a problematic type found in the wild. All of the
+ // operations below should compile.
+ absl::StatusOr<const int> a;
+
+ // Copy-construction
+ absl::StatusOr<const int> b(a);
+
+ // Copy-assignment
+ EXPECT_FALSE(std::is_copy_assignable<absl::StatusOr<const int>>::value);
+
+ // Move-construction
+ absl::StatusOr<const int> c(std::move(a));
+
+ // Move-assignment
+ EXPECT_FALSE(std::is_move_assignable<absl::StatusOr<const int>>::value);
+}
+
+TEST(StatusOr, MapToStatusOrUniquePtr) {
+ // A reduced version of a problematic type found in the wild. All of the
+ // operations below should compile.
+ using MapType = std::map<std::string, absl::StatusOr<std::unique_ptr<int>>>;
+
+ MapType a;
+
+ // Move-construction
+ MapType b(std::move(a));
+
+ // Move-assignment
+ a = std::move(b);
+}
+
+TEST(StatusOr, ValueOrOk) {
+ const absl::StatusOr<int> status_or = 0;
+ EXPECT_EQ(status_or.value_or(-1), 0);
+}
+
+TEST(StatusOr, ValueOrDefault) {
+ const absl::StatusOr<int> status_or = absl::CancelledError();
+ EXPECT_EQ(status_or.value_or(-1), -1);
+}
+
+TEST(StatusOr, MoveOnlyValueOrOk) {
+ EXPECT_THAT(absl::StatusOr<std::unique_ptr<int>>(absl::make_unique<int>(0))
+ .value_or(absl::make_unique<int>(-1)),
+ Pointee(0));
+}
+
+TEST(StatusOr, MoveOnlyValueOrDefault) {
+ EXPECT_THAT(absl::StatusOr<std::unique_ptr<int>>(absl::CancelledError())
+ .value_or(absl::make_unique<int>(-1)),
+ Pointee(-1));
+}
+
+static absl::StatusOr<int> MakeStatus() { return 100; }
+
+TEST(StatusOr, TestIgnoreError) { MakeStatus().IgnoreError(); }
+
+TEST(StatusOr, EqualityOperator) {
+ constexpr int kNumCases = 4;
+ std::array<absl::StatusOr<int>, kNumCases> group1 = {
+ absl::StatusOr<int>(1), absl::StatusOr<int>(2),
+ absl::StatusOr<int>(absl::InvalidArgumentError("msg")),
+ absl::StatusOr<int>(absl::InternalError("msg"))};
+ std::array<absl::StatusOr<int>, kNumCases> group2 = {
+ absl::StatusOr<int>(1), absl::StatusOr<int>(2),
+ absl::StatusOr<int>(absl::InvalidArgumentError("msg")),
+ absl::StatusOr<int>(absl::InternalError("msg"))};
+ for (int i = 0; i < kNumCases; ++i) {
+ for (int j = 0; j < kNumCases; ++j) {
+ if (i == j) {
+ EXPECT_TRUE(group1[i] == group2[j]);
+ EXPECT_FALSE(group1[i] != group2[j]);
+ } else {
+ EXPECT_FALSE(group1[i] == group2[j]);
+ EXPECT_TRUE(group1[i] != group2[j]);
+ }
+ }
+ }
+}
+
+struct MyType {
+ bool operator==(const MyType&) const { return true; }
+};
+
+enum class ConvTraits { kNone = 0, kImplicit = 1, kExplicit = 2 };
+
+// This class has conversion operator to `StatusOr<T>` based on value of
+// `conv_traits`.
+template <typename T, ConvTraits conv_traits = ConvTraits::kNone>
+struct StatusOrConversionBase {};
+
+template <typename T>
+struct StatusOrConversionBase<T, ConvTraits::kImplicit> {
+ operator absl::StatusOr<T>() const& { // NOLINT
+ return absl::InvalidArgumentError("conversion to absl::StatusOr");
+ }
+ operator absl::StatusOr<T>() && { // NOLINT
+ return absl::InvalidArgumentError("conversion to absl::StatusOr");
+ }
+};
+
+template <typename T>
+struct StatusOrConversionBase<T, ConvTraits::kExplicit> {
+ explicit operator absl::StatusOr<T>() const& {
+ return absl::InvalidArgumentError("conversion to absl::StatusOr");
+ }
+ explicit operator absl::StatusOr<T>() && {
+ return absl::InvalidArgumentError("conversion to absl::StatusOr");
+ }
+};
+
+// This class has conversion operator to `T` based on the value of
+// `conv_traits`.
+template <typename T, ConvTraits conv_traits = ConvTraits::kNone>
+struct ConversionBase {};
+
+template <typename T>
+struct ConversionBase<T, ConvTraits::kImplicit> {
+ operator T() const& { return t; } // NOLINT
+ operator T() && { return std::move(t); } // NOLINT
+ T t;
+};
+
+template <typename T>
+struct ConversionBase<T, ConvTraits::kExplicit> {
+ explicit operator T() const& { return t; }
+ explicit operator T() && { return std::move(t); }
+ T t;
+};
+
+// This class has conversion operator to `absl::Status` based on the value of
+// `conv_traits`.
+template <ConvTraits conv_traits = ConvTraits::kNone>
+struct StatusConversionBase {};
+
+template <>
+struct StatusConversionBase<ConvTraits::kImplicit> {
+ operator absl::Status() const& { // NOLINT
+ return absl::InternalError("conversion to Status");
+ }
+ operator absl::Status() && { // NOLINT
+ return absl::InternalError("conversion to Status");
+ }
+};
+
+template <>
+struct StatusConversionBase<ConvTraits::kExplicit> {
+ explicit operator absl::Status() const& { // NOLINT
+ return absl::InternalError("conversion to Status");
+ }
+ explicit operator absl::Status() && { // NOLINT
+ return absl::InternalError("conversion to Status");
+ }
+};
+
+static constexpr int kConvToStatus = 1;
+static constexpr int kConvToStatusOr = 2;
+static constexpr int kConvToT = 4;
+static constexpr int kConvExplicit = 8;
+
+constexpr ConvTraits GetConvTraits(int bit, int config) {
+ return (config & bit) == 0
+ ? ConvTraits::kNone
+ : ((config & kConvExplicit) == 0 ? ConvTraits::kImplicit
+ : ConvTraits::kExplicit);
+}
+
+// This class conditionally has conversion operator to `absl::Status`, `T`,
+// `StatusOr<T>`, based on values of the template parameters.
+template <typename T, int config>
+struct CustomType
+ : StatusOrConversionBase<T, GetConvTraits(kConvToStatusOr, config)>,
+ ConversionBase<T, GetConvTraits(kConvToT, config)>,
+ StatusConversionBase<GetConvTraits(kConvToStatus, config)> {};
+
+struct ConvertibleToAnyStatusOr {
+ template <typename T>
+ operator absl::StatusOr<T>() const { // NOLINT
+ return absl::InvalidArgumentError("Conversion to absl::StatusOr");
+ }
+};
+
+// Test the rank of overload resolution for `StatusOr<T>` constructor and
+// assignment, from highest to lowest:
+// 1. T/Status
+// 2. U that has conversion operator to absl::StatusOr<T>
+// 3. U that is convertible to Status
+// 4. U that is convertible to T
+TEST(StatusOr, ConstructionFromT) {
+ // Construct absl::StatusOr<T> from T when T is convertible to
+ // absl::StatusOr<T>
+ {
+ ConvertibleToAnyStatusOr v;
+ absl::StatusOr<ConvertibleToAnyStatusOr> statusor(v);
+ EXPECT_TRUE(statusor.ok());
+ }
+ {
+ ConvertibleToAnyStatusOr v;
+ absl::StatusOr<ConvertibleToAnyStatusOr> statusor = v;
+ EXPECT_TRUE(statusor.ok());
+ }
+ // Construct absl::StatusOr<T> from T when T is explicitly convertible to
+ // Status
+ {
+ CustomType<MyType, kConvToStatus | kConvExplicit> v;
+ absl::StatusOr<CustomType<MyType, kConvToStatus | kConvExplicit>> statusor(
+ v);
+ EXPECT_TRUE(statusor.ok());
+ }
+ {
+ CustomType<MyType, kConvToStatus | kConvExplicit> v;
+ absl::StatusOr<CustomType<MyType, kConvToStatus | kConvExplicit>> statusor =
+ v;
+ EXPECT_TRUE(statusor.ok());
+ }
+}
+
+// Construct absl::StatusOr<T> from U when U is explicitly convertible to T
+TEST(StatusOr, ConstructionFromTypeConvertibleToT) {
+ {
+ CustomType<MyType, kConvToT | kConvExplicit> v;
+ absl::StatusOr<MyType> statusor(v);
+ EXPECT_TRUE(statusor.ok());
+ }
+ {
+ CustomType<MyType, kConvToT> v;
+ absl::StatusOr<MyType> statusor = v;
+ EXPECT_TRUE(statusor.ok());
+ }
+}
+
+// Construct absl::StatusOr<T> from U when U has explicit conversion operator to
+// absl::StatusOr<T>
+TEST(StatusOr, ConstructionFromTypeWithConversionOperatorToStatusOrT) {
+ {
+ CustomType<MyType, kConvToStatusOr | kConvExplicit> v;
+ absl::StatusOr<MyType> statusor(v);
+ EXPECT_EQ(statusor, v.operator absl::StatusOr<MyType>());
+ }
+ {
+ CustomType<MyType, kConvToT | kConvToStatusOr | kConvExplicit> v;
+ absl::StatusOr<MyType> statusor(v);
+ EXPECT_EQ(statusor, v.operator absl::StatusOr<MyType>());
+ }
+ {
+ CustomType<MyType, kConvToStatusOr | kConvToStatus | kConvExplicit> v;
+ absl::StatusOr<MyType> statusor(v);
+ EXPECT_EQ(statusor, v.operator absl::StatusOr<MyType>());
+ }
+ {
+ CustomType<MyType,
+ kConvToT | kConvToStatusOr | kConvToStatus | kConvExplicit>
+ v;
+ absl::StatusOr<MyType> statusor(v);
+ EXPECT_EQ(statusor, v.operator absl::StatusOr<MyType>());
+ }
+ {
+ CustomType<MyType, kConvToStatusOr> v;
+ absl::StatusOr<MyType> statusor = v;
+ EXPECT_EQ(statusor, v.operator absl::StatusOr<MyType>());
+ }
+ {
+ CustomType<MyType, kConvToT | kConvToStatusOr> v;
+ absl::StatusOr<MyType> statusor = v;
+ EXPECT_EQ(statusor, v.operator absl::StatusOr<MyType>());
+ }
+ {
+ CustomType<MyType, kConvToStatusOr | kConvToStatus> v;
+ absl::StatusOr<MyType> statusor = v;
+ EXPECT_EQ(statusor, v.operator absl::StatusOr<MyType>());
+ }
+ {
+ CustomType<MyType, kConvToT | kConvToStatusOr | kConvToStatus> v;
+ absl::StatusOr<MyType> statusor = v;
+ EXPECT_EQ(statusor, v.operator absl::StatusOr<MyType>());
+ }
+}
+
+TEST(StatusOr, ConstructionFromTypeConvertibleToStatus) {
+ // Construction fails because conversion to `Status` is explicit.
+ {
+ CustomType<MyType, kConvToStatus | kConvExplicit> v;
+ absl::StatusOr<MyType> statusor(v);
+ EXPECT_FALSE(statusor.ok());
+ EXPECT_EQ(statusor.status(), static_cast<absl::Status>(v));
+ }
+ {
+ CustomType<MyType, kConvToT | kConvToStatus | kConvExplicit> v;
+ absl::StatusOr<MyType> statusor(v);
+ EXPECT_FALSE(statusor.ok());
+ EXPECT_EQ(statusor.status(), static_cast<absl::Status>(v));
+ }
+ {
+ CustomType<MyType, kConvToStatus> v;
+ absl::StatusOr<MyType> statusor = v;
+ EXPECT_FALSE(statusor.ok());
+ EXPECT_EQ(statusor.status(), static_cast<absl::Status>(v));
+ }
+ {
+ CustomType<MyType, kConvToT | kConvToStatus> v;
+ absl::StatusOr<MyType> statusor = v;
+ EXPECT_FALSE(statusor.ok());
+ EXPECT_EQ(statusor.status(), static_cast<absl::Status>(v));
+ }
+}
+
+TEST(StatusOr, AssignmentFromT) {
+ // Assign to absl::StatusOr<T> from T when T is convertible to
+ // absl::StatusOr<T>
+ {
+ ConvertibleToAnyStatusOr v;
+ absl::StatusOr<ConvertibleToAnyStatusOr> statusor;
+ statusor = v;
+ EXPECT_TRUE(statusor.ok());
+ }
+ // Assign to absl::StatusOr<T> from T when T is convertible to Status
+ {
+ CustomType<MyType, kConvToStatus> v;
+ absl::StatusOr<CustomType<MyType, kConvToStatus>> statusor;
+ statusor = v;
+ EXPECT_TRUE(statusor.ok());
+ }
+}
+
+TEST(StatusOr, AssignmentFromTypeConvertibleToT) {
+ // Assign to absl::StatusOr<T> from U when U is convertible to T
+ {
+ CustomType<MyType, kConvToT> v;
+ absl::StatusOr<MyType> statusor;
+ statusor = v;
+ EXPECT_TRUE(statusor.ok());
+ }
+}
+
+TEST(StatusOr, AssignmentFromTypeWithConversionOperatortoStatusOrT) {
+ // Assign to absl::StatusOr<T> from U when U has conversion operator to
+ // absl::StatusOr<T>
+ {
+ CustomType<MyType, kConvToStatusOr> v;
+ absl::StatusOr<MyType> statusor;
+ statusor = v;
+ EXPECT_EQ(statusor, v.operator absl::StatusOr<MyType>());
+ }
+ {
+ CustomType<MyType, kConvToT | kConvToStatusOr> v;
+ absl::StatusOr<MyType> statusor;
+ statusor = v;
+ EXPECT_EQ(statusor, v.operator absl::StatusOr<MyType>());
+ }
+ {
+ CustomType<MyType, kConvToStatusOr | kConvToStatus> v;
+ absl::StatusOr<MyType> statusor;
+ statusor = v;
+ EXPECT_EQ(statusor, v.operator absl::StatusOr<MyType>());
+ }
+ {
+ CustomType<MyType, kConvToT | kConvToStatusOr | kConvToStatus> v;
+ absl::StatusOr<MyType> statusor;
+ statusor = v;
+ EXPECT_EQ(statusor, v.operator absl::StatusOr<MyType>());
+ }
+}
+
+TEST(StatusOr, AssignmentFromTypeConvertibleToStatus) {
+ // Assign to absl::StatusOr<T> from U when U is convertible to Status
+ {
+ CustomType<MyType, kConvToStatus> v;
+ absl::StatusOr<MyType> statusor;
+ statusor = v;
+ EXPECT_FALSE(statusor.ok());
+ EXPECT_EQ(statusor.status(), static_cast<absl::Status>(v));
+ }
+ {
+ CustomType<MyType, kConvToT | kConvToStatus> v;
+ absl::StatusOr<MyType> statusor;
+ statusor = v;
+ EXPECT_FALSE(statusor.ok());
+ EXPECT_EQ(statusor.status(), static_cast<absl::Status>(v));
+ }
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/strings/BUILD.bazel b/third_party/abseil/src/absl/strings/BUILD.bazel
new file mode 100644
index 0000000..30a8dd2
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/BUILD.bazel
@@ -0,0 +1,788 @@
+#
+# Copyright 2017 The Abseil Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+load("@rules_cc//cc:defs.bzl", "cc_library", "cc_test")
+load(
+ "//absl:copts/configure_copts.bzl",
+ "ABSL_DEFAULT_COPTS",
+ "ABSL_TEST_COPTS",
+)
+
+package(
+ default_visibility = ["//visibility:public"],
+ features = ["parse_headers"],
+)
+
+licenses(["notice"])
+
+cc_library(
+ name = "strings",
+ srcs = [
+ "ascii.cc",
+ "charconv.cc",
+ "escaping.cc",
+ "internal/charconv_bigint.cc",
+ "internal/charconv_bigint.h",
+ "internal/charconv_parse.cc",
+ "internal/charconv_parse.h",
+ "internal/memutil.cc",
+ "internal/memutil.h",
+ "internal/stl_type_traits.h",
+ "internal/str_join_internal.h",
+ "internal/str_split_internal.h",
+ "match.cc",
+ "numbers.cc",
+ "str_cat.cc",
+ "str_replace.cc",
+ "str_split.cc",
+ "string_view.cc",
+ "substitute.cc",
+ ],
+ hdrs = [
+ "ascii.h",
+ "charconv.h",
+ "escaping.h",
+ "internal/string_constant.h",
+ "match.h",
+ "numbers.h",
+ "str_cat.h",
+ "str_join.h",
+ "str_replace.h",
+ "str_split.h",
+ "string_view.h",
+ "strip.h",
+ "substitute.h",
+ ],
+ copts = ABSL_DEFAULT_COPTS,
+ deps = [
+ ":internal",
+ "//absl/base",
+ "//absl/base:bits",
+ "//absl/base:config",
+ "//absl/base:core_headers",
+ "//absl/base:endian",
+ "//absl/base:raw_logging_internal",
+ "//absl/base:throw_delegate",
+ "//absl/memory",
+ "//absl/meta:type_traits",
+ "//absl/numeric:int128",
+ ],
+)
+
+cc_library(
+ name = "internal",
+ srcs = [
+ "internal/escaping.cc",
+ "internal/ostringstream.cc",
+ "internal/utf8.cc",
+ ],
+ hdrs = [
+ "internal/char_map.h",
+ "internal/escaping.h",
+ "internal/ostringstream.h",
+ "internal/resize_uninitialized.h",
+ "internal/utf8.h",
+ ],
+ copts = ABSL_DEFAULT_COPTS,
+ deps = [
+ "//absl/base:config",
+ "//absl/base:core_headers",
+ "//absl/base:endian",
+ "//absl/base:raw_logging_internal",
+ "//absl/meta:type_traits",
+ ],
+)
+
+cc_test(
+ name = "match_test",
+ size = "small",
+ srcs = ["match_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ visibility = ["//visibility:private"],
+ deps = [
+ ":strings",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "escaping_test",
+ size = "small",
+ srcs = [
+ "escaping_test.cc",
+ "internal/escaping_test_common.h",
+ ],
+ copts = ABSL_TEST_COPTS,
+ visibility = ["//visibility:private"],
+ deps = [
+ ":cord",
+ ":strings",
+ "//absl/base:core_headers",
+ "//absl/container:fixed_array",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "escaping_benchmark",
+ srcs = [
+ "escaping_benchmark.cc",
+ "internal/escaping_test_common.h",
+ ],
+ copts = ABSL_TEST_COPTS,
+ tags = ["benchmark"],
+ visibility = ["//visibility:private"],
+ deps = [
+ ":strings",
+ "//absl/base:raw_logging_internal",
+ "@com_github_google_benchmark//:benchmark_main",
+ ],
+)
+
+cc_test(
+ name = "ascii_test",
+ size = "small",
+ srcs = ["ascii_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ visibility = ["//visibility:private"],
+ deps = [
+ ":strings",
+ "//absl/base:core_headers",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "ascii_benchmark",
+ srcs = ["ascii_benchmark.cc"],
+ copts = ABSL_TEST_COPTS,
+ tags = ["benchmark"],
+ visibility = ["//visibility:private"],
+ deps = [
+ ":strings",
+ "@com_github_google_benchmark//:benchmark_main",
+ ],
+)
+
+cc_test(
+ name = "memutil_benchmark",
+ srcs = [
+ "internal/memutil.h",
+ "internal/memutil_benchmark.cc",
+ ],
+ copts = ABSL_TEST_COPTS,
+ tags = ["benchmark"],
+ visibility = ["//visibility:private"],
+ deps = [
+ ":strings",
+ "//absl/base:core_headers",
+ "@com_github_google_benchmark//:benchmark_main",
+ ],
+)
+
+cc_test(
+ name = "memutil_test",
+ size = "small",
+ srcs = [
+ "internal/memutil.h",
+ "internal/memutil_test.cc",
+ ],
+ copts = ABSL_TEST_COPTS,
+ visibility = ["//visibility:private"],
+ deps = [
+ ":strings",
+ "//absl/base:core_headers",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "utf8_test",
+ size = "small",
+ srcs = [
+ "internal/utf8_test.cc",
+ ],
+ copts = ABSL_TEST_COPTS,
+ visibility = ["//visibility:private"],
+ deps = [
+ ":internal",
+ "//absl/base:core_headers",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "string_constant_test",
+ size = "small",
+ srcs = ["internal/string_constant_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ visibility = ["//visibility:private"],
+ deps = [
+ ":strings",
+ "//absl/meta:type_traits",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "string_view_benchmark",
+ srcs = ["string_view_benchmark.cc"],
+ copts = ABSL_TEST_COPTS,
+ tags = ["benchmark"],
+ visibility = ["//visibility:private"],
+ deps = [
+ ":strings",
+ "//absl/base:core_headers",
+ "//absl/base:raw_logging_internal",
+ "@com_github_google_benchmark//:benchmark_main",
+ ],
+)
+
+cc_test(
+ name = "string_view_test",
+ size = "small",
+ srcs = ["string_view_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ visibility = ["//visibility:private"],
+ deps = [
+ ":strings",
+ "//absl/base:config",
+ "//absl/base:core_headers",
+ "//absl/base:dynamic_annotations",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_library(
+ name = "cord_internal",
+ hdrs = ["internal/cord_internal.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ visibility = ["//visibility:private"],
+ deps = [
+ ":strings",
+ "//absl/base:base_internal",
+ "//absl/container:compressed_tuple",
+ "//absl/meta:type_traits",
+ ],
+)
+
+cc_library(
+ name = "cord",
+ srcs = [
+ "cord.cc",
+ ],
+ hdrs = [
+ "cord.h",
+ ],
+ copts = ABSL_DEFAULT_COPTS,
+ deps = [
+ ":cord_internal",
+ ":internal",
+ ":str_format",
+ ":strings",
+ "//absl/base",
+ "//absl/base:core_headers",
+ "//absl/base:endian",
+ "//absl/base:raw_logging_internal",
+ "//absl/container:fixed_array",
+ "//absl/container:inlined_vector",
+ "//absl/functional:function_ref",
+ "//absl/meta:type_traits",
+ "//absl/types:optional",
+ ],
+)
+
+cc_library(
+ name = "cord_test_helpers",
+ testonly = 1,
+ hdrs = [
+ "cord_test_helpers.h",
+ ],
+ copts = ABSL_DEFAULT_COPTS,
+ deps = [
+ ":cord",
+ ],
+)
+
+cc_test(
+ name = "cord_test",
+ size = "medium",
+ srcs = ["cord_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ visibility = ["//visibility:private"],
+ deps = [
+ ":cord",
+ ":cord_test_helpers",
+ ":str_format",
+ ":strings",
+ "//absl/base",
+ "//absl/base:config",
+ "//absl/base:core_headers",
+ "//absl/base:endian",
+ "//absl/base:raw_logging_internal",
+ "//absl/container:fixed_array",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "substitute_test",
+ size = "small",
+ srcs = ["substitute_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ visibility = ["//visibility:private"],
+ deps = [
+ ":strings",
+ "//absl/base:core_headers",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "str_replace_benchmark",
+ srcs = ["str_replace_benchmark.cc"],
+ copts = ABSL_TEST_COPTS,
+ tags = ["benchmark"],
+ visibility = ["//visibility:private"],
+ deps = [
+ ":strings",
+ "//absl/base:raw_logging_internal",
+ "@com_github_google_benchmark//:benchmark_main",
+ ],
+)
+
+cc_test(
+ name = "str_replace_test",
+ size = "small",
+ srcs = ["str_replace_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ visibility = ["//visibility:private"],
+ deps = [
+ ":strings",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "str_split_test",
+ srcs = ["str_split_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ visibility = ["//visibility:private"],
+ deps = [
+ ":strings",
+ "//absl/base:core_headers",
+ "//absl/base:dynamic_annotations",
+ "//absl/container:flat_hash_map",
+ "//absl/container:node_hash_map",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "str_split_benchmark",
+ srcs = ["str_split_benchmark.cc"],
+ copts = ABSL_TEST_COPTS,
+ tags = ["benchmark"],
+ visibility = ["//visibility:private"],
+ deps = [
+ ":strings",
+ "//absl/base:raw_logging_internal",
+ "@com_github_google_benchmark//:benchmark_main",
+ ],
+)
+
+cc_test(
+ name = "ostringstream_test",
+ size = "small",
+ srcs = ["internal/ostringstream_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ visibility = ["//visibility:private"],
+ deps = [
+ ":internal",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "ostringstream_benchmark",
+ srcs = ["internal/ostringstream_benchmark.cc"],
+ copts = ABSL_TEST_COPTS,
+ tags = ["benchmark"],
+ visibility = ["//visibility:private"],
+ deps = [
+ ":internal",
+ "@com_github_google_benchmark//:benchmark_main",
+ ],
+)
+
+cc_test(
+ name = "resize_uninitialized_test",
+ size = "small",
+ srcs = [
+ "internal/resize_uninitialized.h",
+ "internal/resize_uninitialized_test.cc",
+ ],
+ copts = ABSL_TEST_COPTS,
+ visibility = ["//visibility:private"],
+ deps = [
+ "//absl/base:core_headers",
+ "//absl/meta:type_traits",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "str_join_test",
+ size = "small",
+ srcs = ["str_join_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ visibility = ["//visibility:private"],
+ deps = [
+ ":strings",
+ "//absl/base:core_headers",
+ "//absl/memory",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "str_join_benchmark",
+ srcs = ["str_join_benchmark.cc"],
+ copts = ABSL_TEST_COPTS,
+ tags = ["benchmark"],
+ visibility = ["//visibility:private"],
+ deps = [
+ ":strings",
+ "@com_github_google_benchmark//:benchmark_main",
+ ],
+)
+
+cc_test(
+ name = "str_cat_test",
+ size = "small",
+ srcs = ["str_cat_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ visibility = ["//visibility:private"],
+ deps = [
+ ":strings",
+ "//absl/base:core_headers",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "str_cat_benchmark",
+ srcs = ["str_cat_benchmark.cc"],
+ copts = ABSL_TEST_COPTS,
+ tags = ["benchmark"],
+ visibility = ["//visibility:private"],
+ deps = [
+ ":strings",
+ "@com_github_google_benchmark//:benchmark_main",
+ ],
+)
+
+cc_test(
+ name = "numbers_test",
+ size = "medium",
+ srcs = [
+ "internal/numbers_test_common.h",
+ "numbers_test.cc",
+ ],
+ copts = ABSL_TEST_COPTS,
+ visibility = ["//visibility:private"],
+ deps = [
+ ":internal",
+ ":pow10_helper",
+ ":strings",
+ "//absl/base:config",
+ "//absl/base:raw_logging_internal",
+ "//absl/random",
+ "//absl/random:distributions",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "numbers_benchmark",
+ srcs = ["numbers_benchmark.cc"],
+ copts = ABSL_TEST_COPTS,
+ tags = ["benchmark"],
+ visibility = ["//visibility:private"],
+ deps = [
+ ":strings",
+ "//absl/base:raw_logging_internal",
+ "//absl/random",
+ "//absl/random:distributions",
+ "@com_github_google_benchmark//:benchmark_main",
+ ],
+)
+
+cc_test(
+ name = "strip_test",
+ size = "small",
+ srcs = ["strip_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ visibility = ["//visibility:private"],
+ deps = [
+ ":strings",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "char_map_test",
+ srcs = ["internal/char_map_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ deps = [
+ ":internal",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "char_map_benchmark",
+ srcs = ["internal/char_map_benchmark.cc"],
+ copts = ABSL_TEST_COPTS,
+ tags = ["benchmark"],
+ deps = [
+ ":internal",
+ "@com_github_google_benchmark//:benchmark_main",
+ ],
+)
+
+cc_test(
+ name = "charconv_test",
+ srcs = ["charconv_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ deps = [
+ ":pow10_helper",
+ ":str_format",
+ ":strings",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "charconv_parse_test",
+ srcs = [
+ "internal/charconv_parse.h",
+ "internal/charconv_parse_test.cc",
+ ],
+ copts = ABSL_TEST_COPTS,
+ deps = [
+ ":strings",
+ "//absl/base:config",
+ "//absl/base:raw_logging_internal",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "charconv_bigint_test",
+ srcs = [
+ "internal/charconv_bigint.h",
+ "internal/charconv_bigint_test.cc",
+ "internal/charconv_parse.h",
+ ],
+ copts = ABSL_TEST_COPTS,
+ deps = [
+ ":strings",
+ "//absl/base:config",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "charconv_benchmark",
+ srcs = [
+ "charconv_benchmark.cc",
+ ],
+ tags = [
+ "benchmark",
+ ],
+ deps = [
+ ":strings",
+ "@com_github_google_benchmark//:benchmark_main",
+ ],
+)
+
+cc_library(
+ name = "str_format",
+ hdrs = [
+ "str_format.h",
+ ],
+ copts = ABSL_DEFAULT_COPTS,
+ deps = [
+ ":str_format_internal",
+ ],
+)
+
+cc_library(
+ name = "str_format_internal",
+ srcs = [
+ "internal/str_format/arg.cc",
+ "internal/str_format/bind.cc",
+ "internal/str_format/extension.cc",
+ "internal/str_format/float_conversion.cc",
+ "internal/str_format/output.cc",
+ "internal/str_format/parser.cc",
+ ],
+ hdrs = [
+ "internal/str_format/arg.h",
+ "internal/str_format/bind.h",
+ "internal/str_format/checker.h",
+ "internal/str_format/extension.h",
+ "internal/str_format/float_conversion.h",
+ "internal/str_format/output.h",
+ "internal/str_format/parser.h",
+ ],
+ copts = ABSL_DEFAULT_COPTS,
+ visibility = ["//visibility:private"],
+ deps = [
+ ":strings",
+ "//absl/base:bits",
+ "//absl/base:config",
+ "//absl/base:core_headers",
+ "//absl/functional:function_ref",
+ "//absl/meta:type_traits",
+ "//absl/numeric:int128",
+ "//absl/types:optional",
+ "//absl/types:span",
+ ],
+)
+
+cc_test(
+ name = "str_format_test",
+ srcs = ["str_format_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ visibility = ["//visibility:private"],
+ deps = [
+ ":cord",
+ ":str_format",
+ ":strings",
+ "//absl/base:core_headers",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "str_format_extension_test",
+ srcs = [
+ "internal/str_format/extension_test.cc",
+ ],
+ copts = ABSL_TEST_COPTS,
+ visibility = ["//visibility:private"],
+ deps = [
+ ":str_format",
+ ":str_format_internal",
+ ":strings",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "str_format_arg_test",
+ srcs = ["internal/str_format/arg_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ visibility = ["//visibility:private"],
+ deps = [
+ ":str_format",
+ ":str_format_internal",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "str_format_bind_test",
+ srcs = ["internal/str_format/bind_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ visibility = ["//visibility:private"],
+ deps = [
+ ":str_format_internal",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "str_format_checker_test",
+ srcs = ["internal/str_format/checker_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ visibility = ["//visibility:private"],
+ deps = [
+ ":str_format",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "str_format_convert_test",
+ size = "medium",
+ srcs = ["internal/str_format/convert_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ visibility = ["//visibility:private"],
+ deps = [
+ ":str_format_internal",
+ ":strings",
+ "//absl/base:raw_logging_internal",
+ "//absl/types:optional",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "str_format_output_test",
+ srcs = ["internal/str_format/output_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ visibility = ["//visibility:private"],
+ deps = [
+ ":cord",
+ ":str_format_internal",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "str_format_parser_test",
+ srcs = ["internal/str_format/parser_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ visibility = ["//visibility:private"],
+ deps = [
+ ":str_format_internal",
+ "//absl/base:core_headers",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_library(
+ name = "pow10_helper",
+ testonly = True,
+ srcs = ["internal/pow10_helper.cc"],
+ hdrs = ["internal/pow10_helper.h"],
+ visibility = ["//visibility:private"],
+ deps = ["//absl/base:config"],
+)
+
+cc_test(
+ name = "pow10_helper_test",
+ srcs = ["internal/pow10_helper_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ visibility = ["//visibility:private"],
+ deps = [
+ ":pow10_helper",
+ ":str_format",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
diff --git a/third_party/abseil/src/absl/strings/CMakeLists.txt b/third_party/abseil/src/absl/strings/CMakeLists.txt
new file mode 100644
index 0000000..2b994a7
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/CMakeLists.txt
@@ -0,0 +1,609 @@
+#
+# Copyright 2017 The Abseil Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+absl_cc_library(
+ NAME
+ strings
+ HDRS
+ "ascii.h"
+ "charconv.h"
+ "escaping.h"
+ "internal/string_constant.h"
+ "match.h"
+ "numbers.h"
+ "str_cat.h"
+ "str_join.h"
+ "str_replace.h"
+ "str_split.h"
+ "string_view.h"
+ "strip.h"
+ "substitute.h"
+ SRCS
+ "ascii.cc"
+ "charconv.cc"
+ "escaping.cc"
+ "internal/charconv_bigint.cc"
+ "internal/charconv_bigint.h"
+ "internal/charconv_parse.cc"
+ "internal/charconv_parse.h"
+ "internal/memutil.cc"
+ "internal/memutil.h"
+ "internal/stl_type_traits.h"
+ "internal/str_join_internal.h"
+ "internal/str_split_internal.h"
+ "match.cc"
+ "numbers.cc"
+ "str_cat.cc"
+ "str_replace.cc"
+ "str_split.cc"
+ "string_view.cc"
+ "substitute.cc"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::strings_internal
+ absl::base
+ absl::bits
+ absl::config
+ absl::core_headers
+ absl::endian
+ absl::int128
+ absl::memory
+ absl::raw_logging_internal
+ absl::throw_delegate
+ absl::type_traits
+ PUBLIC
+)
+
+absl_cc_library(
+ NAME
+ strings_internal
+ HDRS
+ "internal/char_map.h"
+ "internal/escaping.cc"
+ "internal/escaping.h"
+ "internal/ostringstream.h"
+ "internal/resize_uninitialized.h"
+ "internal/utf8.h"
+ SRCS
+ "internal/ostringstream.cc"
+ "internal/utf8.cc"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::config
+ absl::core_headers
+ absl::endian
+ absl::raw_logging_internal
+ absl::type_traits
+)
+
+absl_cc_test(
+ NAME
+ match_test
+ SRCS
+ "match_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::strings
+ absl::base
+ gmock_main
+)
+
+absl_cc_test(
+ NAME
+ escaping_test
+ SRCS
+ "escaping_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::strings
+ absl::core_headers
+ absl::fixed_array
+ gmock_main
+)
+
+absl_cc_test(
+ NAME
+ ascii_test
+ SRCS
+ "ascii_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::strings
+ absl::core_headers
+ gmock_main
+)
+
+absl_cc_test(
+ NAME
+ memutil_test
+ SRCS
+ "internal/memutil.h"
+ "internal/memutil_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::strings
+ absl::core_headers
+ gmock_main
+)
+
+absl_cc_test(
+ NAME
+ utf8_test
+ SRCS
+ "internal/utf8_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::strings_internal
+ absl::base
+ absl::core_headers
+ gmock_main
+)
+
+absl_cc_test(
+ NAME
+ string_constant_test
+ SRCS
+ "internal/string_constant_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::strings
+ absl::type_traits
+ gmock_main
+)
+
+absl_cc_test(
+ NAME
+ string_view_test
+ SRCS
+ "string_view_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::strings
+ absl::config
+ absl::core_headers
+ absl::dynamic_annotations
+ gmock_main
+)
+
+absl_cc_test(
+ NAME
+ substitute_test
+ SRCS
+ "substitute_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::strings
+ absl::core_headers
+ gmock_main
+)
+
+absl_cc_test(
+ NAME
+ str_replace_test
+ SRCS
+ "str_replace_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::strings
+ gmock_main
+)
+
+absl_cc_test(
+ NAME
+ str_split_test
+ SRCS
+ "str_split_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::strings
+ absl::base
+ absl::core_headers
+ absl::dynamic_annotations
+ absl::flat_hash_map
+ absl::node_hash_map
+ gmock_main
+)
+
+absl_cc_test(
+ NAME
+ ostringstream_test
+ SRCS
+ "internal/ostringstream_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::strings_internal
+ gmock_main
+)
+
+absl_cc_test(
+ NAME
+ resize_uninitialized_test
+ SRCS
+ "internal/resize_uninitialized.h"
+ "internal/resize_uninitialized_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::base
+ absl::core_headers
+ absl::type_traits
+ gmock_main
+)
+
+absl_cc_test(
+ NAME
+ str_join_test
+ SRCS
+ "str_join_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::strings
+ absl::base
+ absl::core_headers
+ absl::memory
+ gmock_main
+)
+
+absl_cc_test(
+ NAME
+ str_cat_test
+ SRCS
+ "str_cat_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::strings
+ absl::core_headers
+ gmock_main
+)
+
+absl_cc_test(
+ NAME
+ numbers_test
+ SRCS
+ "internal/numbers_test_common.h"
+ "numbers_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::strings
+ absl::core_headers
+ absl::pow10_helper
+ absl::config
+ absl::raw_logging_internal
+ absl::random_random
+ absl::random_distributions
+ absl::strings_internal
+ gmock_main
+)
+
+absl_cc_test(
+ NAME
+ strip_test
+ SRCS
+ "strip_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::strings
+ absl::base
+ gmock_main
+)
+
+absl_cc_test(
+ NAME
+ char_map_test
+ SRCS
+ "internal/char_map_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::strings_internal
+ gmock_main
+)
+
+absl_cc_test(
+ NAME
+ charconv_test
+ SRCS
+ "charconv_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::strings
+ absl::str_format
+ absl::pow10_helper
+ gmock_main
+)
+
+absl_cc_test(
+ NAME
+ charconv_parse_test
+ SRCS
+ "internal/charconv_parse.h"
+ "internal/charconv_parse_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::strings
+ absl::config
+ absl::raw_logging_internal
+ gmock_main
+)
+
+absl_cc_test(
+ NAME
+ charconv_bigint_test
+ SRCS
+ "internal/charconv_bigint.h"
+ "internal/charconv_bigint_test.cc"
+ "internal/charconv_parse.h"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::strings
+ absl::config
+ gmock_main
+)
+
+absl_cc_library(
+ NAME
+ str_format
+ HDRS
+ "str_format.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::str_format_internal
+ PUBLIC
+)
+
+absl_cc_library(
+ NAME
+ str_format_internal
+ HDRS
+ "internal/str_format/arg.h"
+ "internal/str_format/bind.h"
+ "internal/str_format/checker.h"
+ "internal/str_format/extension.h"
+ "internal/str_format/float_conversion.h"
+ "internal/str_format/output.h"
+ "internal/str_format/parser.h"
+ SRCS
+ "internal/str_format/arg.cc"
+ "internal/str_format/bind.cc"
+ "internal/str_format/extension.cc"
+ "internal/str_format/float_conversion.cc"
+ "internal/str_format/output.cc"
+ "internal/str_format/parser.cc"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::bits
+ absl::strings
+ absl::config
+ absl::core_headers
+ absl::type_traits
+ absl::int128
+ absl::span
+)
+
+absl_cc_test(
+ NAME
+ str_format_test
+ SRCS
+ "str_format_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::str_format
+ absl::cord
+ absl::strings
+ absl::core_headers
+ gmock_main
+)
+
+absl_cc_test(
+ NAME
+ str_format_extension_test
+ SRCS
+ "internal/str_format/extension_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::str_format
+ absl::str_format_internal
+ absl::strings
+ gmock_main
+)
+
+absl_cc_test(
+ NAME
+ str_format_arg_test
+ SRCS
+ "internal/str_format/arg_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::str_format
+ absl::str_format_internal
+ gmock_main
+)
+
+absl_cc_test(
+ NAME
+ str_format_bind_test
+ SRCS
+ "internal/str_format/bind_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::str_format_internal
+ gmock_main
+)
+
+absl_cc_test(
+ NAME
+ str_format_checker_test
+ SRCS
+ "internal/str_format/checker_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::str_format
+ gmock_main
+)
+
+absl_cc_test(
+ NAME
+ str_format_convert_test
+ SRCS
+ "internal/str_format/convert_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::strings
+ absl::str_format_internal
+ absl::raw_logging_internal
+ absl::int128
+ gmock_main
+)
+
+absl_cc_test(
+ NAME
+ str_format_output_test
+ SRCS
+ "internal/str_format/output_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::str_format_internal
+ absl::cord
+ gmock_main
+)
+
+absl_cc_test(
+ NAME
+ str_format_parser_test
+ SRCS
+ "internal/str_format/parser_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::str_format_internal
+ absl::core_headers
+ gmock_main
+)
+
+absl_cc_library(
+ NAME
+ pow10_helper
+ HDRS
+ "internal/pow10_helper.h"
+ SRCS
+ "internal/pow10_helper.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::config
+ TESTONLY
+)
+
+absl_cc_test(
+ NAME
+ pow10_helper_test
+ SRCS
+ "internal/pow10_helper_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::pow10_helper
+ absl::str_format
+ gmock_main
+)
+
+absl_cc_library(
+ NAME
+ cord
+ HDRS
+ "cord.h"
+ SRCS
+ "cord.cc"
+ "internal/cord_internal.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::base
+ absl::base_internal
+ absl::compressed_tuple
+ absl::core_headers
+ absl::endian
+ absl::fixed_array
+ absl::function_ref
+ absl::inlined_vector
+ absl::optional
+ absl::raw_logging_internal
+ absl::strings
+ absl::strings_internal
+ absl::type_traits
+ PUBLIC
+)
+
+absl_cc_library(
+ NAME
+ cord_test_helpers
+ HDRS
+ "cord_test_helpers.h"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::cord
+ TESTONLY
+)
+
+absl_cc_test(
+ NAME
+ cord_test
+ SRCS
+ "cord_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::cord
+ absl::str_format
+ absl::strings
+ absl::base
+ absl::config
+ absl::core_headers
+ absl::endian
+ absl::raw_logging_internal
+ absl::fixed_array
+ gmock_main
+)
diff --git a/third_party/abseil/src/absl/strings/ascii.cc b/third_party/abseil/src/absl/strings/ascii.cc
new file mode 100644
index 0000000..93bb03e
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/ascii.cc
@@ -0,0 +1,200 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/strings/ascii.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace ascii_internal {
+
+// # Table generated by this Python code (bit 0x02 is currently unused):
+// TODO(mbar) Move Python code for generation of table to BUILD and link here.
+
+// NOTE: The kAsciiPropertyBits table used within this code was generated by
+// Python code of the following form. (Bit 0x02 is currently unused and
+// available.)
+//
+// def Hex2(n):
+// return '0x' + hex(n/16)[2:] + hex(n%16)[2:]
+// def IsPunct(ch):
+// return (ord(ch) >= 32 and ord(ch) < 127 and
+// not ch.isspace() and not ch.isalnum())
+// def IsBlank(ch):
+// return ch in ' \t'
+// def IsCntrl(ch):
+// return ord(ch) < 32 or ord(ch) == 127
+// def IsXDigit(ch):
+// return ch.isdigit() or ch.lower() in 'abcdef'
+// for i in range(128):
+// ch = chr(i)
+// mask = ((ch.isalpha() and 0x01 or 0) |
+// (ch.isalnum() and 0x04 or 0) |
+// (ch.isspace() and 0x08 or 0) |
+// (IsPunct(ch) and 0x10 or 0) |
+// (IsBlank(ch) and 0x20 or 0) |
+// (IsCntrl(ch) and 0x40 or 0) |
+// (IsXDigit(ch) and 0x80 or 0))
+// print Hex2(mask) + ',',
+// if i % 16 == 7:
+// print ' //', Hex2(i & 0x78)
+// elif i % 16 == 15:
+// print
+
+// clang-format off
+// Array of bitfields holding character information. Each bit value corresponds
+// to a particular character feature. For readability, and because the value
+// of these bits is tightly coupled to this implementation, the individual bits
+// are not named. Note that bitfields for all characters above ASCII 127 are
+// zero-initialized.
+ABSL_DLL const unsigned char kPropertyBits[256] = {
+ 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, // 0x00
+ 0x40, 0x68, 0x48, 0x48, 0x48, 0x48, 0x40, 0x40,
+ 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, // 0x10
+ 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40,
+ 0x28, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, // 0x20
+ 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,
+ 0x84, 0x84, 0x84, 0x84, 0x84, 0x84, 0x84, 0x84, // 0x30
+ 0x84, 0x84, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,
+ 0x10, 0x85, 0x85, 0x85, 0x85, 0x85, 0x85, 0x05, // 0x40
+ 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05,
+ 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, // 0x50
+ 0x05, 0x05, 0x05, 0x10, 0x10, 0x10, 0x10, 0x10,
+ 0x10, 0x85, 0x85, 0x85, 0x85, 0x85, 0x85, 0x05, // 0x60
+ 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05,
+ 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, // 0x70
+ 0x05, 0x05, 0x05, 0x10, 0x10, 0x10, 0x10, 0x40,
+};
+
+// Array of characters for the ascii_tolower() function. For values 'A'
+// through 'Z', return the lower-case character; otherwise, return the
+// identity of the passed character.
+ABSL_DLL const char kToLower[256] = {
+ '\x00', '\x01', '\x02', '\x03', '\x04', '\x05', '\x06', '\x07',
+ '\x08', '\x09', '\x0a', '\x0b', '\x0c', '\x0d', '\x0e', '\x0f',
+ '\x10', '\x11', '\x12', '\x13', '\x14', '\x15', '\x16', '\x17',
+ '\x18', '\x19', '\x1a', '\x1b', '\x1c', '\x1d', '\x1e', '\x1f',
+ '\x20', '\x21', '\x22', '\x23', '\x24', '\x25', '\x26', '\x27',
+ '\x28', '\x29', '\x2a', '\x2b', '\x2c', '\x2d', '\x2e', '\x2f',
+ '\x30', '\x31', '\x32', '\x33', '\x34', '\x35', '\x36', '\x37',
+ '\x38', '\x39', '\x3a', '\x3b', '\x3c', '\x3d', '\x3e', '\x3f',
+ '\x40', 'a', 'b', 'c', 'd', 'e', 'f', 'g',
+ 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o',
+ 'p', 'q', 'r', 's', 't', 'u', 'v', 'w',
+ 'x', 'y', 'z', '\x5b', '\x5c', '\x5d', '\x5e', '\x5f',
+ '\x60', '\x61', '\x62', '\x63', '\x64', '\x65', '\x66', '\x67',
+ '\x68', '\x69', '\x6a', '\x6b', '\x6c', '\x6d', '\x6e', '\x6f',
+ '\x70', '\x71', '\x72', '\x73', '\x74', '\x75', '\x76', '\x77',
+ '\x78', '\x79', '\x7a', '\x7b', '\x7c', '\x7d', '\x7e', '\x7f',
+ '\x80', '\x81', '\x82', '\x83', '\x84', '\x85', '\x86', '\x87',
+ '\x88', '\x89', '\x8a', '\x8b', '\x8c', '\x8d', '\x8e', '\x8f',
+ '\x90', '\x91', '\x92', '\x93', '\x94', '\x95', '\x96', '\x97',
+ '\x98', '\x99', '\x9a', '\x9b', '\x9c', '\x9d', '\x9e', '\x9f',
+ '\xa0', '\xa1', '\xa2', '\xa3', '\xa4', '\xa5', '\xa6', '\xa7',
+ '\xa8', '\xa9', '\xaa', '\xab', '\xac', '\xad', '\xae', '\xaf',
+ '\xb0', '\xb1', '\xb2', '\xb3', '\xb4', '\xb5', '\xb6', '\xb7',
+ '\xb8', '\xb9', '\xba', '\xbb', '\xbc', '\xbd', '\xbe', '\xbf',
+ '\xc0', '\xc1', '\xc2', '\xc3', '\xc4', '\xc5', '\xc6', '\xc7',
+ '\xc8', '\xc9', '\xca', '\xcb', '\xcc', '\xcd', '\xce', '\xcf',
+ '\xd0', '\xd1', '\xd2', '\xd3', '\xd4', '\xd5', '\xd6', '\xd7',
+ '\xd8', '\xd9', '\xda', '\xdb', '\xdc', '\xdd', '\xde', '\xdf',
+ '\xe0', '\xe1', '\xe2', '\xe3', '\xe4', '\xe5', '\xe6', '\xe7',
+ '\xe8', '\xe9', '\xea', '\xeb', '\xec', '\xed', '\xee', '\xef',
+ '\xf0', '\xf1', '\xf2', '\xf3', '\xf4', '\xf5', '\xf6', '\xf7',
+ '\xf8', '\xf9', '\xfa', '\xfb', '\xfc', '\xfd', '\xfe', '\xff',
+};
+
+// Array of characters for the ascii_toupper() function. For values 'a'
+// through 'z', return the upper-case character; otherwise, return the
+// identity of the passed character.
+ABSL_DLL const char kToUpper[256] = {
+ '\x00', '\x01', '\x02', '\x03', '\x04', '\x05', '\x06', '\x07',
+ '\x08', '\x09', '\x0a', '\x0b', '\x0c', '\x0d', '\x0e', '\x0f',
+ '\x10', '\x11', '\x12', '\x13', '\x14', '\x15', '\x16', '\x17',
+ '\x18', '\x19', '\x1a', '\x1b', '\x1c', '\x1d', '\x1e', '\x1f',
+ '\x20', '\x21', '\x22', '\x23', '\x24', '\x25', '\x26', '\x27',
+ '\x28', '\x29', '\x2a', '\x2b', '\x2c', '\x2d', '\x2e', '\x2f',
+ '\x30', '\x31', '\x32', '\x33', '\x34', '\x35', '\x36', '\x37',
+ '\x38', '\x39', '\x3a', '\x3b', '\x3c', '\x3d', '\x3e', '\x3f',
+ '\x40', '\x41', '\x42', '\x43', '\x44', '\x45', '\x46', '\x47',
+ '\x48', '\x49', '\x4a', '\x4b', '\x4c', '\x4d', '\x4e', '\x4f',
+ '\x50', '\x51', '\x52', '\x53', '\x54', '\x55', '\x56', '\x57',
+ '\x58', '\x59', '\x5a', '\x5b', '\x5c', '\x5d', '\x5e', '\x5f',
+ '\x60', 'A', 'B', 'C', 'D', 'E', 'F', 'G',
+ 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O',
+ 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W',
+ 'X', 'Y', 'Z', '\x7b', '\x7c', '\x7d', '\x7e', '\x7f',
+ '\x80', '\x81', '\x82', '\x83', '\x84', '\x85', '\x86', '\x87',
+ '\x88', '\x89', '\x8a', '\x8b', '\x8c', '\x8d', '\x8e', '\x8f',
+ '\x90', '\x91', '\x92', '\x93', '\x94', '\x95', '\x96', '\x97',
+ '\x98', '\x99', '\x9a', '\x9b', '\x9c', '\x9d', '\x9e', '\x9f',
+ '\xa0', '\xa1', '\xa2', '\xa3', '\xa4', '\xa5', '\xa6', '\xa7',
+ '\xa8', '\xa9', '\xaa', '\xab', '\xac', '\xad', '\xae', '\xaf',
+ '\xb0', '\xb1', '\xb2', '\xb3', '\xb4', '\xb5', '\xb6', '\xb7',
+ '\xb8', '\xb9', '\xba', '\xbb', '\xbc', '\xbd', '\xbe', '\xbf',
+ '\xc0', '\xc1', '\xc2', '\xc3', '\xc4', '\xc5', '\xc6', '\xc7',
+ '\xc8', '\xc9', '\xca', '\xcb', '\xcc', '\xcd', '\xce', '\xcf',
+ '\xd0', '\xd1', '\xd2', '\xd3', '\xd4', '\xd5', '\xd6', '\xd7',
+ '\xd8', '\xd9', '\xda', '\xdb', '\xdc', '\xdd', '\xde', '\xdf',
+ '\xe0', '\xe1', '\xe2', '\xe3', '\xe4', '\xe5', '\xe6', '\xe7',
+ '\xe8', '\xe9', '\xea', '\xeb', '\xec', '\xed', '\xee', '\xef',
+ '\xf0', '\xf1', '\xf2', '\xf3', '\xf4', '\xf5', '\xf6', '\xf7',
+ '\xf8', '\xf9', '\xfa', '\xfb', '\xfc', '\xfd', '\xfe', '\xff',
+};
+// clang-format on
+
+} // namespace ascii_internal
+
+void AsciiStrToLower(std::string* s) {
+ for (auto& ch : *s) {
+ ch = absl::ascii_tolower(ch);
+ }
+}
+
+void AsciiStrToUpper(std::string* s) {
+ for (auto& ch : *s) {
+ ch = absl::ascii_toupper(ch);
+ }
+}
+
+void RemoveExtraAsciiWhitespace(std::string* str) {
+ auto stripped = StripAsciiWhitespace(*str);
+
+ if (stripped.empty()) {
+ str->clear();
+ return;
+ }
+
+ auto input_it = stripped.begin();
+ auto input_end = stripped.end();
+ auto output_it = &(*str)[0];
+ bool is_ws = false;
+
+ for (; input_it < input_end; ++input_it) {
+ if (is_ws) {
+ // Consecutive whitespace? Keep only the last.
+ is_ws = absl::ascii_isspace(*input_it);
+ if (is_ws) --output_it;
+ } else {
+ is_ws = absl::ascii_isspace(*input_it);
+ }
+
+ *output_it = *input_it;
+ ++output_it;
+ }
+
+ str->erase(output_it - &(*str)[0]);
+}
+
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/strings/ascii.h b/third_party/abseil/src/absl/strings/ascii.h
new file mode 100644
index 0000000..b46bc71
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/ascii.h
@@ -0,0 +1,242 @@
+//
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: ascii.h
+// -----------------------------------------------------------------------------
+//
+// This package contains functions operating on characters and strings
+// restricted to standard ASCII. These include character classification
+// functions analogous to those found in the ANSI C Standard Library <ctype.h>
+// header file.
+//
+// C++ implementations provide <ctype.h> functionality based on their
+// C environment locale. In general, reliance on such a locale is not ideal, as
+// the locale standard is problematic (and may not return invariant information
+// for the same character set, for example). These `ascii_*()` functions are
+// hard-wired for standard ASCII, much faster, and guaranteed to behave
+// consistently. They will never be overloaded, nor will their function
+// signature change.
+//
+// `ascii_isalnum()`, `ascii_isalpha()`, `ascii_isascii()`, `ascii_isblank()`,
+// `ascii_iscntrl()`, `ascii_isdigit()`, `ascii_isgraph()`, `ascii_islower()`,
+// `ascii_isprint()`, `ascii_ispunct()`, `ascii_isspace()`, `ascii_isupper()`,
+// `ascii_isxdigit()`
+// Analogous to the <ctype.h> functions with similar names, these
+// functions take an unsigned char and return a bool, based on whether the
+// character matches the condition specified.
+//
+// If the input character has a numerical value greater than 127, these
+// functions return `false`.
+//
+// `ascii_tolower()`, `ascii_toupper()`
+// Analogous to the <ctype.h> functions with similar names, these functions
+// take an unsigned char and return a char.
+//
+// If the input character is not an ASCII {lower,upper}-case letter (including
+// numerical values greater than 127) then the functions return the same value
+// as the input character.
+
+#ifndef ABSL_STRINGS_ASCII_H_
+#define ABSL_STRINGS_ASCII_H_
+
+#include <algorithm>
+#include <string>
+
+#include "absl/base/attributes.h"
+#include "absl/base/config.h"
+#include "absl/strings/string_view.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace ascii_internal {
+
+// Declaration for an array of bitfields holding character information.
+ABSL_DLL extern const unsigned char kPropertyBits[256];
+
+// Declaration for the array of characters to upper-case characters.
+ABSL_DLL extern const char kToUpper[256];
+
+// Declaration for the array of characters to lower-case characters.
+ABSL_DLL extern const char kToLower[256];
+
+} // namespace ascii_internal
+
+// ascii_isalpha()
+//
+// Determines whether the given character is an alphabetic character.
+inline bool ascii_isalpha(unsigned char c) {
+ return (ascii_internal::kPropertyBits[c] & 0x01) != 0;
+}
+
+// ascii_isalnum()
+//
+// Determines whether the given character is an alphanumeric character.
+inline bool ascii_isalnum(unsigned char c) {
+ return (ascii_internal::kPropertyBits[c] & 0x04) != 0;
+}
+
+// ascii_isspace()
+//
+// Determines whether the given character is a whitespace character (space,
+// tab, vertical tab, formfeed, linefeed, or carriage return).
+inline bool ascii_isspace(unsigned char c) {
+ return (ascii_internal::kPropertyBits[c] & 0x08) != 0;
+}
+
+// ascii_ispunct()
+//
+// Determines whether the given character is a punctuation character.
+inline bool ascii_ispunct(unsigned char c) {
+ return (ascii_internal::kPropertyBits[c] & 0x10) != 0;
+}
+
+// ascii_isblank()
+//
+// Determines whether the given character is a blank character (tab or space).
+inline bool ascii_isblank(unsigned char c) {
+ return (ascii_internal::kPropertyBits[c] & 0x20) != 0;
+}
+
+// ascii_iscntrl()
+//
+// Determines whether the given character is a control character.
+inline bool ascii_iscntrl(unsigned char c) {
+ return (ascii_internal::kPropertyBits[c] & 0x40) != 0;
+}
+
+// ascii_isxdigit()
+//
+// Determines whether the given character can be represented as a hexadecimal
+// digit character (i.e. {0-9} or {A-F}).
+inline bool ascii_isxdigit(unsigned char c) {
+ return (ascii_internal::kPropertyBits[c] & 0x80) != 0;
+}
+
+// ascii_isdigit()
+//
+// Determines whether the given character can be represented as a decimal
+// digit character (i.e. {0-9}).
+inline bool ascii_isdigit(unsigned char c) { return c >= '0' && c <= '9'; }
+
+// ascii_isprint()
+//
+// Determines whether the given character is printable, including whitespace.
+inline bool ascii_isprint(unsigned char c) { return c >= 32 && c < 127; }
+
+// ascii_isgraph()
+//
+// Determines whether the given character has a graphical representation.
+inline bool ascii_isgraph(unsigned char c) { return c > 32 && c < 127; }
+
+// ascii_isupper()
+//
+// Determines whether the given character is uppercase.
+inline bool ascii_isupper(unsigned char c) { return c >= 'A' && c <= 'Z'; }
+
+// ascii_islower()
+//
+// Determines whether the given character is lowercase.
+inline bool ascii_islower(unsigned char c) { return c >= 'a' && c <= 'z'; }
+
+// ascii_isascii()
+//
+// Determines whether the given character is ASCII.
+inline bool ascii_isascii(unsigned char c) { return c < 128; }
+
+// ascii_tolower()
+//
+// Returns an ASCII character, converting to lowercase if uppercase is
+// passed. Note that character values > 127 are simply returned.
+inline char ascii_tolower(unsigned char c) {
+ return ascii_internal::kToLower[c];
+}
+
+// Converts the characters in `s` to lowercase, changing the contents of `s`.
+void AsciiStrToLower(std::string* s);
+
+// Creates a lowercase string from a given absl::string_view.
+ABSL_MUST_USE_RESULT inline std::string AsciiStrToLower(absl::string_view s) {
+ std::string result(s);
+ absl::AsciiStrToLower(&result);
+ return result;
+}
+
+// ascii_toupper()
+//
+// Returns the ASCII character, converting to upper-case if lower-case is
+// passed. Note that characters values > 127 are simply returned.
+inline char ascii_toupper(unsigned char c) {
+ return ascii_internal::kToUpper[c];
+}
+
+// Converts the characters in `s` to uppercase, changing the contents of `s`.
+void AsciiStrToUpper(std::string* s);
+
+// Creates an uppercase string from a given absl::string_view.
+ABSL_MUST_USE_RESULT inline std::string AsciiStrToUpper(absl::string_view s) {
+ std::string result(s);
+ absl::AsciiStrToUpper(&result);
+ return result;
+}
+
+// Returns absl::string_view with whitespace stripped from the beginning of the
+// given string_view.
+ABSL_MUST_USE_RESULT inline absl::string_view StripLeadingAsciiWhitespace(
+ absl::string_view str) {
+ auto it = std::find_if_not(str.begin(), str.end(), absl::ascii_isspace);
+ return str.substr(it - str.begin());
+}
+
+// Strips in place whitespace from the beginning of the given string.
+inline void StripLeadingAsciiWhitespace(std::string* str) {
+ auto it = std::find_if_not(str->begin(), str->end(), absl::ascii_isspace);
+ str->erase(str->begin(), it);
+}
+
+// Returns absl::string_view with whitespace stripped from the end of the given
+// string_view.
+ABSL_MUST_USE_RESULT inline absl::string_view StripTrailingAsciiWhitespace(
+ absl::string_view str) {
+ auto it = std::find_if_not(str.rbegin(), str.rend(), absl::ascii_isspace);
+ return str.substr(0, str.rend() - it);
+}
+
+// Strips in place whitespace from the end of the given string
+inline void StripTrailingAsciiWhitespace(std::string* str) {
+ auto it = std::find_if_not(str->rbegin(), str->rend(), absl::ascii_isspace);
+ str->erase(str->rend() - it);
+}
+
+// Returns absl::string_view with whitespace stripped from both ends of the
+// given string_view.
+ABSL_MUST_USE_RESULT inline absl::string_view StripAsciiWhitespace(
+ absl::string_view str) {
+ return StripTrailingAsciiWhitespace(StripLeadingAsciiWhitespace(str));
+}
+
+// Strips in place whitespace from both ends of the given string
+inline void StripAsciiWhitespace(std::string* str) {
+ StripTrailingAsciiWhitespace(str);
+ StripLeadingAsciiWhitespace(str);
+}
+
+// Removes leading, trailing, and consecutive internal whitespace.
+void RemoveExtraAsciiWhitespace(std::string*);
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_STRINGS_ASCII_H_
diff --git a/third_party/abseil/src/absl/strings/ascii_benchmark.cc b/third_party/abseil/src/absl/strings/ascii_benchmark.cc
new file mode 100644
index 0000000..aca458c
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/ascii_benchmark.cc
@@ -0,0 +1,120 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/strings/ascii.h"
+
+#include <cctype>
+#include <string>
+#include <array>
+#include <random>
+
+#include "benchmark/benchmark.h"
+
+namespace {
+
+std::array<unsigned char, 256> MakeShuffledBytes() {
+ std::array<unsigned char, 256> bytes;
+ for (size_t i = 0; i < 256; ++i) bytes[i] = static_cast<unsigned char>(i);
+ std::random_device rd;
+ std::seed_seq seed({rd(), rd(), rd(), rd(), rd(), rd(), rd(), rd()});
+ std::mt19937 g(seed);
+ std::shuffle(bytes.begin(), bytes.end(), g);
+ return bytes;
+}
+
+template <typename Function>
+void AsciiBenchmark(benchmark::State& state, Function f) {
+ std::array<unsigned char, 256> bytes = MakeShuffledBytes();
+ size_t sum = 0;
+ for (auto _ : state) {
+ for (unsigned char b : bytes) sum += f(b) ? 1 : 0;
+ }
+ // Make a copy of `sum` before calling `DoNotOptimize` to make sure that `sum`
+ // can be put in a CPU register and not degrade performance in the loop above.
+ size_t sum2 = sum;
+ benchmark::DoNotOptimize(sum2);
+ state.SetBytesProcessed(state.iterations() * bytes.size());
+}
+
+using StdAsciiFunction = int (*)(int);
+template <StdAsciiFunction f>
+void BM_Ascii(benchmark::State& state) {
+ AsciiBenchmark(state, f);
+}
+
+using AbslAsciiIsFunction = bool (*)(unsigned char);
+template <AbslAsciiIsFunction f>
+void BM_Ascii(benchmark::State& state) {
+ AsciiBenchmark(state, f);
+}
+
+using AbslAsciiToFunction = char (*)(unsigned char);
+template <AbslAsciiToFunction f>
+void BM_Ascii(benchmark::State& state) {
+ AsciiBenchmark(state, f);
+}
+
+inline char Noop(unsigned char b) { return static_cast<char>(b); }
+
+BENCHMARK_TEMPLATE(BM_Ascii, Noop);
+BENCHMARK_TEMPLATE(BM_Ascii, std::isalpha);
+BENCHMARK_TEMPLATE(BM_Ascii, absl::ascii_isalpha);
+BENCHMARK_TEMPLATE(BM_Ascii, std::isdigit);
+BENCHMARK_TEMPLATE(BM_Ascii, absl::ascii_isdigit);
+BENCHMARK_TEMPLATE(BM_Ascii, std::isalnum);
+BENCHMARK_TEMPLATE(BM_Ascii, absl::ascii_isalnum);
+BENCHMARK_TEMPLATE(BM_Ascii, std::isspace);
+BENCHMARK_TEMPLATE(BM_Ascii, absl::ascii_isspace);
+BENCHMARK_TEMPLATE(BM_Ascii, std::ispunct);
+BENCHMARK_TEMPLATE(BM_Ascii, absl::ascii_ispunct);
+BENCHMARK_TEMPLATE(BM_Ascii, std::isblank);
+BENCHMARK_TEMPLATE(BM_Ascii, absl::ascii_isblank);
+BENCHMARK_TEMPLATE(BM_Ascii, std::iscntrl);
+BENCHMARK_TEMPLATE(BM_Ascii, absl::ascii_iscntrl);
+BENCHMARK_TEMPLATE(BM_Ascii, std::isxdigit);
+BENCHMARK_TEMPLATE(BM_Ascii, absl::ascii_isxdigit);
+BENCHMARK_TEMPLATE(BM_Ascii, std::isprint);
+BENCHMARK_TEMPLATE(BM_Ascii, absl::ascii_isprint);
+BENCHMARK_TEMPLATE(BM_Ascii, std::isgraph);
+BENCHMARK_TEMPLATE(BM_Ascii, absl::ascii_isgraph);
+BENCHMARK_TEMPLATE(BM_Ascii, std::isupper);
+BENCHMARK_TEMPLATE(BM_Ascii, absl::ascii_isupper);
+BENCHMARK_TEMPLATE(BM_Ascii, std::islower);
+BENCHMARK_TEMPLATE(BM_Ascii, absl::ascii_islower);
+BENCHMARK_TEMPLATE(BM_Ascii, isascii);
+BENCHMARK_TEMPLATE(BM_Ascii, absl::ascii_isascii);
+BENCHMARK_TEMPLATE(BM_Ascii, std::tolower);
+BENCHMARK_TEMPLATE(BM_Ascii, absl::ascii_tolower);
+BENCHMARK_TEMPLATE(BM_Ascii, std::toupper);
+BENCHMARK_TEMPLATE(BM_Ascii, absl::ascii_toupper);
+
+static void BM_StrToLower(benchmark::State& state) {
+ const int size = state.range(0);
+ std::string s(size, 'X');
+ for (auto _ : state) {
+ benchmark::DoNotOptimize(absl::AsciiStrToLower(s));
+ }
+}
+BENCHMARK(BM_StrToLower)->Range(1, 1 << 20);
+
+static void BM_StrToUpper(benchmark::State& state) {
+ const int size = state.range(0);
+ std::string s(size, 'x');
+ for (auto _ : state) {
+ benchmark::DoNotOptimize(absl::AsciiStrToUpper(s));
+ }
+}
+BENCHMARK(BM_StrToUpper)->Range(1, 1 << 20);
+
+} // namespace
diff --git a/third_party/abseil/src/absl/strings/ascii_test.cc b/third_party/abseil/src/absl/strings/ascii_test.cc
new file mode 100644
index 0000000..5ecd23f
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/ascii_test.cc
@@ -0,0 +1,361 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/strings/ascii.h"
+
+#include <cctype>
+#include <clocale>
+#include <cstring>
+#include <string>
+
+#include "gtest/gtest.h"
+#include "absl/base/macros.h"
+#include "absl/base/port.h"
+
+namespace {
+
+TEST(AsciiIsFoo, All) {
+ for (int i = 0; i < 256; i++) {
+ if ((i >= 'a' && i <= 'z') || (i >= 'A' && i <= 'Z'))
+ EXPECT_TRUE(absl::ascii_isalpha(i)) << ": failed on " << i;
+ else
+ EXPECT_TRUE(!absl::ascii_isalpha(i)) << ": failed on " << i;
+ }
+ for (int i = 0; i < 256; i++) {
+ if ((i >= '0' && i <= '9'))
+ EXPECT_TRUE(absl::ascii_isdigit(i)) << ": failed on " << i;
+ else
+ EXPECT_TRUE(!absl::ascii_isdigit(i)) << ": failed on " << i;
+ }
+ for (int i = 0; i < 256; i++) {
+ if (absl::ascii_isalpha(i) || absl::ascii_isdigit(i))
+ EXPECT_TRUE(absl::ascii_isalnum(i)) << ": failed on " << i;
+ else
+ EXPECT_TRUE(!absl::ascii_isalnum(i)) << ": failed on " << i;
+ }
+ for (int i = 0; i < 256; i++) {
+ if (i != '\0' && strchr(" \r\n\t\v\f", i))
+ EXPECT_TRUE(absl::ascii_isspace(i)) << ": failed on " << i;
+ else
+ EXPECT_TRUE(!absl::ascii_isspace(i)) << ": failed on " << i;
+ }
+ for (int i = 0; i < 256; i++) {
+ if (i >= 32 && i < 127)
+ EXPECT_TRUE(absl::ascii_isprint(i)) << ": failed on " << i;
+ else
+ EXPECT_TRUE(!absl::ascii_isprint(i)) << ": failed on " << i;
+ }
+ for (int i = 0; i < 256; i++) {
+ if (absl::ascii_isprint(i) && !absl::ascii_isspace(i) &&
+ !absl::ascii_isalnum(i))
+ EXPECT_TRUE(absl::ascii_ispunct(i)) << ": failed on " << i;
+ else
+ EXPECT_TRUE(!absl::ascii_ispunct(i)) << ": failed on " << i;
+ }
+ for (int i = 0; i < 256; i++) {
+ if (i == ' ' || i == '\t')
+ EXPECT_TRUE(absl::ascii_isblank(i)) << ": failed on " << i;
+ else
+ EXPECT_TRUE(!absl::ascii_isblank(i)) << ": failed on " << i;
+ }
+ for (int i = 0; i < 256; i++) {
+ if (i < 32 || i == 127)
+ EXPECT_TRUE(absl::ascii_iscntrl(i)) << ": failed on " << i;
+ else
+ EXPECT_TRUE(!absl::ascii_iscntrl(i)) << ": failed on " << i;
+ }
+ for (int i = 0; i < 256; i++) {
+ if (absl::ascii_isdigit(i) || (i >= 'A' && i <= 'F') ||
+ (i >= 'a' && i <= 'f'))
+ EXPECT_TRUE(absl::ascii_isxdigit(i)) << ": failed on " << i;
+ else
+ EXPECT_TRUE(!absl::ascii_isxdigit(i)) << ": failed on " << i;
+ }
+ for (int i = 0; i < 256; i++) {
+ if (i > 32 && i < 127)
+ EXPECT_TRUE(absl::ascii_isgraph(i)) << ": failed on " << i;
+ else
+ EXPECT_TRUE(!absl::ascii_isgraph(i)) << ": failed on " << i;
+ }
+ for (int i = 0; i < 256; i++) {
+ if (i >= 'A' && i <= 'Z')
+ EXPECT_TRUE(absl::ascii_isupper(i)) << ": failed on " << i;
+ else
+ EXPECT_TRUE(!absl::ascii_isupper(i)) << ": failed on " << i;
+ }
+ for (int i = 0; i < 256; i++) {
+ if (i >= 'a' && i <= 'z')
+ EXPECT_TRUE(absl::ascii_islower(i)) << ": failed on " << i;
+ else
+ EXPECT_TRUE(!absl::ascii_islower(i)) << ": failed on " << i;
+ }
+ for (int i = 0; i < 128; i++) {
+ EXPECT_TRUE(absl::ascii_isascii(i)) << ": failed on " << i;
+ }
+ for (int i = 128; i < 256; i++) {
+ EXPECT_TRUE(!absl::ascii_isascii(i)) << ": failed on " << i;
+ }
+
+ // The official is* functions don't accept negative signed chars, but
+ // our absl::ascii_is* functions do.
+ for (int i = 0; i < 256; i++) {
+ signed char sc = static_cast<signed char>(static_cast<unsigned char>(i));
+ EXPECT_EQ(absl::ascii_isalpha(i), absl::ascii_isalpha(sc)) << i;
+ EXPECT_EQ(absl::ascii_isdigit(i), absl::ascii_isdigit(sc)) << i;
+ EXPECT_EQ(absl::ascii_isalnum(i), absl::ascii_isalnum(sc)) << i;
+ EXPECT_EQ(absl::ascii_isspace(i), absl::ascii_isspace(sc)) << i;
+ EXPECT_EQ(absl::ascii_ispunct(i), absl::ascii_ispunct(sc)) << i;
+ EXPECT_EQ(absl::ascii_isblank(i), absl::ascii_isblank(sc)) << i;
+ EXPECT_EQ(absl::ascii_iscntrl(i), absl::ascii_iscntrl(sc)) << i;
+ EXPECT_EQ(absl::ascii_isxdigit(i), absl::ascii_isxdigit(sc)) << i;
+ EXPECT_EQ(absl::ascii_isprint(i), absl::ascii_isprint(sc)) << i;
+ EXPECT_EQ(absl::ascii_isgraph(i), absl::ascii_isgraph(sc)) << i;
+ EXPECT_EQ(absl::ascii_isupper(i), absl::ascii_isupper(sc)) << i;
+ EXPECT_EQ(absl::ascii_islower(i), absl::ascii_islower(sc)) << i;
+ EXPECT_EQ(absl::ascii_isascii(i), absl::ascii_isascii(sc)) << i;
+ }
+}
+
+// Checks that absl::ascii_isfoo returns the same value as isfoo in the C
+// locale.
+TEST(AsciiIsFoo, SameAsIsFoo) {
+#ifndef __ANDROID__
+ // temporarily change locale to C. It should already be C, but just for safety
+ const char* old_locale = setlocale(LC_CTYPE, "C");
+ ASSERT_TRUE(old_locale != nullptr);
+#endif
+
+ for (int i = 0; i < 256; i++) {
+ EXPECT_EQ(isalpha(i) != 0, absl::ascii_isalpha(i)) << i;
+ EXPECT_EQ(isdigit(i) != 0, absl::ascii_isdigit(i)) << i;
+ EXPECT_EQ(isalnum(i) != 0, absl::ascii_isalnum(i)) << i;
+ EXPECT_EQ(isspace(i) != 0, absl::ascii_isspace(i)) << i;
+ EXPECT_EQ(ispunct(i) != 0, absl::ascii_ispunct(i)) << i;
+ EXPECT_EQ(isblank(i) != 0, absl::ascii_isblank(i)) << i;
+ EXPECT_EQ(iscntrl(i) != 0, absl::ascii_iscntrl(i)) << i;
+ EXPECT_EQ(isxdigit(i) != 0, absl::ascii_isxdigit(i)) << i;
+ EXPECT_EQ(isprint(i) != 0, absl::ascii_isprint(i)) << i;
+ EXPECT_EQ(isgraph(i) != 0, absl::ascii_isgraph(i)) << i;
+ EXPECT_EQ(isupper(i) != 0, absl::ascii_isupper(i)) << i;
+ EXPECT_EQ(islower(i) != 0, absl::ascii_islower(i)) << i;
+ EXPECT_EQ(isascii(i) != 0, absl::ascii_isascii(i)) << i;
+ }
+
+#ifndef __ANDROID__
+ // restore the old locale.
+ ASSERT_TRUE(setlocale(LC_CTYPE, old_locale));
+#endif
+}
+
+TEST(AsciiToFoo, All) {
+#ifndef __ANDROID__
+ // temporarily change locale to C. It should already be C, but just for safety
+ const char* old_locale = setlocale(LC_CTYPE, "C");
+ ASSERT_TRUE(old_locale != nullptr);
+#endif
+
+ for (int i = 0; i < 256; i++) {
+ if (absl::ascii_islower(i))
+ EXPECT_EQ(absl::ascii_toupper(i), 'A' + (i - 'a')) << i;
+ else
+ EXPECT_EQ(absl::ascii_toupper(i), static_cast<char>(i)) << i;
+
+ if (absl::ascii_isupper(i))
+ EXPECT_EQ(absl::ascii_tolower(i), 'a' + (i - 'A')) << i;
+ else
+ EXPECT_EQ(absl::ascii_tolower(i), static_cast<char>(i)) << i;
+
+ // These CHECKs only hold in a C locale.
+ EXPECT_EQ(static_cast<char>(tolower(i)), absl::ascii_tolower(i)) << i;
+ EXPECT_EQ(static_cast<char>(toupper(i)), absl::ascii_toupper(i)) << i;
+
+ // The official to* functions don't accept negative signed chars, but
+ // our absl::ascii_to* functions do.
+ signed char sc = static_cast<signed char>(static_cast<unsigned char>(i));
+ EXPECT_EQ(absl::ascii_tolower(i), absl::ascii_tolower(sc)) << i;
+ EXPECT_EQ(absl::ascii_toupper(i), absl::ascii_toupper(sc)) << i;
+ }
+#ifndef __ANDROID__
+ // restore the old locale.
+ ASSERT_TRUE(setlocale(LC_CTYPE, old_locale));
+#endif
+}
+
+TEST(AsciiStrTo, Lower) {
+ const char buf[] = "ABCDEF";
+ const std::string str("GHIJKL");
+ const std::string str2("MNOPQR");
+ const absl::string_view sp(str2);
+
+ EXPECT_EQ("abcdef", absl::AsciiStrToLower(buf));
+ EXPECT_EQ("ghijkl", absl::AsciiStrToLower(str));
+ EXPECT_EQ("mnopqr", absl::AsciiStrToLower(sp));
+
+ char mutable_buf[] = "Mutable";
+ std::transform(mutable_buf, mutable_buf + strlen(mutable_buf),
+ mutable_buf, absl::ascii_tolower);
+ EXPECT_STREQ("mutable", mutable_buf);
+}
+
+TEST(AsciiStrTo, Upper) {
+ const char buf[] = "abcdef";
+ const std::string str("ghijkl");
+ const std::string str2("mnopqr");
+ const absl::string_view sp(str2);
+
+ EXPECT_EQ("ABCDEF", absl::AsciiStrToUpper(buf));
+ EXPECT_EQ("GHIJKL", absl::AsciiStrToUpper(str));
+ EXPECT_EQ("MNOPQR", absl::AsciiStrToUpper(sp));
+
+ char mutable_buf[] = "Mutable";
+ std::transform(mutable_buf, mutable_buf + strlen(mutable_buf),
+ mutable_buf, absl::ascii_toupper);
+ EXPECT_STREQ("MUTABLE", mutable_buf);
+}
+
+TEST(StripLeadingAsciiWhitespace, FromStringView) {
+ EXPECT_EQ(absl::string_view{},
+ absl::StripLeadingAsciiWhitespace(absl::string_view{}));
+ EXPECT_EQ("foo", absl::StripLeadingAsciiWhitespace({"foo"}));
+ EXPECT_EQ("foo", absl::StripLeadingAsciiWhitespace({"\t \n\f\r\n\vfoo"}));
+ EXPECT_EQ("foo foo\n ",
+ absl::StripLeadingAsciiWhitespace({"\t \n\f\r\n\vfoo foo\n "}));
+ EXPECT_EQ(absl::string_view{}, absl::StripLeadingAsciiWhitespace(
+ {"\t \n\f\r\v\n\t \n\f\r\v\n"}));
+}
+
+TEST(StripLeadingAsciiWhitespace, InPlace) {
+ std::string str;
+
+ absl::StripLeadingAsciiWhitespace(&str);
+ EXPECT_EQ("", str);
+
+ str = "foo";
+ absl::StripLeadingAsciiWhitespace(&str);
+ EXPECT_EQ("foo", str);
+
+ str = "\t \n\f\r\n\vfoo";
+ absl::StripLeadingAsciiWhitespace(&str);
+ EXPECT_EQ("foo", str);
+
+ str = "\t \n\f\r\n\vfoo foo\n ";
+ absl::StripLeadingAsciiWhitespace(&str);
+ EXPECT_EQ("foo foo\n ", str);
+
+ str = "\t \n\f\r\v\n\t \n\f\r\v\n";
+ absl::StripLeadingAsciiWhitespace(&str);
+ EXPECT_EQ(absl::string_view{}, str);
+}
+
+TEST(StripTrailingAsciiWhitespace, FromStringView) {
+ EXPECT_EQ(absl::string_view{},
+ absl::StripTrailingAsciiWhitespace(absl::string_view{}));
+ EXPECT_EQ("foo", absl::StripTrailingAsciiWhitespace({"foo"}));
+ EXPECT_EQ("foo", absl::StripTrailingAsciiWhitespace({"foo\t \n\f\r\n\v"}));
+ EXPECT_EQ(" \nfoo foo",
+ absl::StripTrailingAsciiWhitespace({" \nfoo foo\t \n\f\r\n\v"}));
+ EXPECT_EQ(absl::string_view{}, absl::StripTrailingAsciiWhitespace(
+ {"\t \n\f\r\v\n\t \n\f\r\v\n"}));
+}
+
+TEST(StripTrailingAsciiWhitespace, InPlace) {
+ std::string str;
+
+ absl::StripTrailingAsciiWhitespace(&str);
+ EXPECT_EQ("", str);
+
+ str = "foo";
+ absl::StripTrailingAsciiWhitespace(&str);
+ EXPECT_EQ("foo", str);
+
+ str = "foo\t \n\f\r\n\v";
+ absl::StripTrailingAsciiWhitespace(&str);
+ EXPECT_EQ("foo", str);
+
+ str = " \nfoo foo\t \n\f\r\n\v";
+ absl::StripTrailingAsciiWhitespace(&str);
+ EXPECT_EQ(" \nfoo foo", str);
+
+ str = "\t \n\f\r\v\n\t \n\f\r\v\n";
+ absl::StripTrailingAsciiWhitespace(&str);
+ EXPECT_EQ(absl::string_view{}, str);
+}
+
+TEST(StripAsciiWhitespace, FromStringView) {
+ EXPECT_EQ(absl::string_view{},
+ absl::StripAsciiWhitespace(absl::string_view{}));
+ EXPECT_EQ("foo", absl::StripAsciiWhitespace({"foo"}));
+ EXPECT_EQ("foo",
+ absl::StripAsciiWhitespace({"\t \n\f\r\n\vfoo\t \n\f\r\n\v"}));
+ EXPECT_EQ("foo foo", absl::StripAsciiWhitespace(
+ {"\t \n\f\r\n\vfoo foo\t \n\f\r\n\v"}));
+ EXPECT_EQ(absl::string_view{},
+ absl::StripAsciiWhitespace({"\t \n\f\r\v\n\t \n\f\r\v\n"}));
+}
+
+TEST(StripAsciiWhitespace, InPlace) {
+ std::string str;
+
+ absl::StripAsciiWhitespace(&str);
+ EXPECT_EQ("", str);
+
+ str = "foo";
+ absl::StripAsciiWhitespace(&str);
+ EXPECT_EQ("foo", str);
+
+ str = "\t \n\f\r\n\vfoo\t \n\f\r\n\v";
+ absl::StripAsciiWhitespace(&str);
+ EXPECT_EQ("foo", str);
+
+ str = "\t \n\f\r\n\vfoo foo\t \n\f\r\n\v";
+ absl::StripAsciiWhitespace(&str);
+ EXPECT_EQ("foo foo", str);
+
+ str = "\t \n\f\r\v\n\t \n\f\r\v\n";
+ absl::StripAsciiWhitespace(&str);
+ EXPECT_EQ(absl::string_view{}, str);
+}
+
+TEST(RemoveExtraAsciiWhitespace, InPlace) {
+ const char* inputs[] = {"No extra space",
+ " Leading whitespace",
+ "Trailing whitespace ",
+ " Leading and trailing ",
+ " Whitespace \t in\v middle ",
+ "'Eeeeep! \n Newlines!\n",
+ "nospaces",
+ "",
+ "\n\t a\t\n\nb \t\n"};
+
+ const char* outputs[] = {
+ "No extra space",
+ "Leading whitespace",
+ "Trailing whitespace",
+ "Leading and trailing",
+ "Whitespace in middle",
+ "'Eeeeep! Newlines!",
+ "nospaces",
+ "",
+ "a\nb",
+ };
+ const int NUM_TESTS = ABSL_ARRAYSIZE(inputs);
+
+ for (int i = 0; i < NUM_TESTS; i++) {
+ std::string s(inputs[i]);
+ absl::RemoveExtraAsciiWhitespace(&s);
+ EXPECT_EQ(outputs[i], s);
+ }
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/strings/charconv.cc b/third_party/abseil/src/absl/strings/charconv.cc
new file mode 100644
index 0000000..3613a65
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/charconv.cc
@@ -0,0 +1,984 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/strings/charconv.h"
+
+#include <algorithm>
+#include <cassert>
+#include <cmath>
+#include <cstring>
+
+#include "absl/base/casts.h"
+#include "absl/base/internal/bits.h"
+#include "absl/numeric/int128.h"
+#include "absl/strings/internal/charconv_bigint.h"
+#include "absl/strings/internal/charconv_parse.h"
+
+// The macro ABSL_BIT_PACK_FLOATS is defined on x86-64, where IEEE floating
+// point numbers have the same endianness in memory as a bitfield struct
+// containing the corresponding parts.
+//
+// When set, we replace calls to ldexp() with manual bit packing, which is
+// faster and is unaffected by floating point environment.
+#ifdef ABSL_BIT_PACK_FLOATS
+#error ABSL_BIT_PACK_FLOATS cannot be directly set
+#elif defined(__x86_64__) || defined(_M_X64)
+#define ABSL_BIT_PACK_FLOATS 1
+#endif
+
+// A note about subnormals:
+//
+// The code below talks about "normals" and "subnormals". A normal IEEE float
+// has a fixed-width mantissa and power of two exponent. For example, a normal
+// `double` has a 53-bit mantissa. Because the high bit is always 1, it is not
+// stored in the representation. The implicit bit buys an extra bit of
+// resolution in the datatype.
+//
+// The downside of this scheme is that there is a large gap between DBL_MIN and
+// zero. (Large, at least, relative to the different between DBL_MIN and the
+// next representable number). This gap is softened by the "subnormal" numbers,
+// which have the same power-of-two exponent as DBL_MIN, but no implicit 53rd
+// bit. An all-bits-zero exponent in the encoding represents subnormals. (Zero
+// is represented as a subnormal with an all-bits-zero mantissa.)
+//
+// The code below, in calculations, represents the mantissa as a uint64_t. The
+// end result normally has the 53rd bit set. It represents subnormals by using
+// narrower mantissas.
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace {
+
+template <typename FloatType>
+struct FloatTraits;
+
+template <>
+struct FloatTraits<double> {
+ // The number of mantissa bits in the given float type. This includes the
+ // implied high bit.
+ static constexpr int kTargetMantissaBits = 53;
+
+ // The largest supported IEEE exponent, in our integral mantissa
+ // representation.
+ //
+ // If `m` is the largest possible int kTargetMantissaBits bits wide, then
+ // m * 2**kMaxExponent is exactly equal to DBL_MAX.
+ static constexpr int kMaxExponent = 971;
+
+ // The smallest supported IEEE normal exponent, in our integral mantissa
+ // representation.
+ //
+ // If `m` is the smallest possible int kTargetMantissaBits bits wide, then
+ // m * 2**kMinNormalExponent is exactly equal to DBL_MIN.
+ static constexpr int kMinNormalExponent = -1074;
+
+ static double MakeNan(const char* tagp) {
+ // Support nan no matter which namespace it's in. Some platforms
+ // incorrectly don't put it in namespace std.
+ using namespace std; // NOLINT
+ return nan(tagp);
+ }
+
+ // Builds a nonzero floating point number out of the provided parts.
+ //
+ // This is intended to do the same operation as ldexp(mantissa, exponent),
+ // but using purely integer math, to avoid -ffastmath and floating
+ // point environment issues. Using type punning is also faster. We fall back
+ // to ldexp on a per-platform basis for portability.
+ //
+ // `exponent` must be between kMinNormalExponent and kMaxExponent.
+ //
+ // `mantissa` must either be exactly kTargetMantissaBits wide, in which case
+ // a normal value is made, or it must be less narrow than that, in which case
+ // `exponent` must be exactly kMinNormalExponent, and a subnormal value is
+ // made.
+ static double Make(uint64_t mantissa, int exponent, bool sign) {
+#ifndef ABSL_BIT_PACK_FLOATS
+ // Support ldexp no matter which namespace it's in. Some platforms
+ // incorrectly don't put it in namespace std.
+ using namespace std; // NOLINT
+ return sign ? -ldexp(mantissa, exponent) : ldexp(mantissa, exponent);
+#else
+ constexpr uint64_t kMantissaMask =
+ (uint64_t(1) << (kTargetMantissaBits - 1)) - 1;
+ uint64_t dbl = static_cast<uint64_t>(sign) << 63;
+ if (mantissa > kMantissaMask) {
+ // Normal value.
+ // Adjust by 1023 for the exponent representation bias, and an additional
+ // 52 due to the implied decimal point in the IEEE mantissa represenation.
+ dbl += uint64_t{exponent + 1023u + kTargetMantissaBits - 1} << 52;
+ mantissa &= kMantissaMask;
+ } else {
+ // subnormal value
+ assert(exponent == kMinNormalExponent);
+ }
+ dbl += mantissa;
+ return absl::bit_cast<double>(dbl);
+#endif // ABSL_BIT_PACK_FLOATS
+ }
+};
+
+// Specialization of floating point traits for the `float` type. See the
+// FloatTraits<double> specialization above for meaning of each of the following
+// members and methods.
+template <>
+struct FloatTraits<float> {
+ static constexpr int kTargetMantissaBits = 24;
+ static constexpr int kMaxExponent = 104;
+ static constexpr int kMinNormalExponent = -149;
+ static float MakeNan(const char* tagp) {
+ // Support nanf no matter which namespace it's in. Some platforms
+ // incorrectly don't put it in namespace std.
+ using namespace std; // NOLINT
+ return nanf(tagp);
+ }
+ static float Make(uint32_t mantissa, int exponent, bool sign) {
+#ifndef ABSL_BIT_PACK_FLOATS
+ // Support ldexpf no matter which namespace it's in. Some platforms
+ // incorrectly don't put it in namespace std.
+ using namespace std; // NOLINT
+ return sign ? -ldexpf(mantissa, exponent) : ldexpf(mantissa, exponent);
+#else
+ constexpr uint32_t kMantissaMask =
+ (uint32_t(1) << (kTargetMantissaBits - 1)) - 1;
+ uint32_t flt = static_cast<uint32_t>(sign) << 31;
+ if (mantissa > kMantissaMask) {
+ // Normal value.
+ // Adjust by 127 for the exponent representation bias, and an additional
+ // 23 due to the implied decimal point in the IEEE mantissa represenation.
+ flt += uint32_t{exponent + 127u + kTargetMantissaBits - 1} << 23;
+ mantissa &= kMantissaMask;
+ } else {
+ // subnormal value
+ assert(exponent == kMinNormalExponent);
+ }
+ flt += mantissa;
+ return absl::bit_cast<float>(flt);
+#endif // ABSL_BIT_PACK_FLOATS
+ }
+};
+
+// Decimal-to-binary conversions require coercing powers of 10 into a mantissa
+// and a power of 2. The two helper functions Power10Mantissa(n) and
+// Power10Exponent(n) perform this task. Together, these represent a hand-
+// rolled floating point value which is equal to or just less than 10**n.
+//
+// The return values satisfy two range guarantees:
+//
+// Power10Mantissa(n) * 2**Power10Exponent(n) <= 10**n
+// < (Power10Mantissa(n) + 1) * 2**Power10Exponent(n)
+//
+// 2**63 <= Power10Mantissa(n) < 2**64.
+//
+// Lookups into the power-of-10 table must first check the Power10Overflow() and
+// Power10Underflow() functions, to avoid out-of-bounds table access.
+//
+// Indexes into these tables are biased by -kPower10TableMin, and the table has
+// values in the range [kPower10TableMin, kPower10TableMax].
+extern const uint64_t kPower10MantissaTable[];
+extern const int16_t kPower10ExponentTable[];
+
+// The smallest allowed value for use with the Power10Mantissa() and
+// Power10Exponent() functions below. (If a smaller exponent is needed in
+// calculations, the end result is guaranteed to underflow.)
+constexpr int kPower10TableMin = -342;
+
+// The largest allowed value for use with the Power10Mantissa() and
+// Power10Exponent() functions below. (If a smaller exponent is needed in
+// calculations, the end result is guaranteed to overflow.)
+constexpr int kPower10TableMax = 308;
+
+uint64_t Power10Mantissa(int n) {
+ return kPower10MantissaTable[n - kPower10TableMin];
+}
+
+int Power10Exponent(int n) {
+ return kPower10ExponentTable[n - kPower10TableMin];
+}
+
+// Returns true if n is large enough that 10**n always results in an IEEE
+// overflow.
+bool Power10Overflow(int n) { return n > kPower10TableMax; }
+
+// Returns true if n is small enough that 10**n times a ParsedFloat mantissa
+// always results in an IEEE underflow.
+bool Power10Underflow(int n) { return n < kPower10TableMin; }
+
+// Returns true if Power10Mantissa(n) * 2**Power10Exponent(n) is exactly equal
+// to 10**n numerically. Put another way, this returns true if there is no
+// truncation error in Power10Mantissa(n).
+bool Power10Exact(int n) { return n >= 0 && n <= 27; }
+
+// Sentinel exponent values for representing numbers too large or too close to
+// zero to represent in a double.
+constexpr int kOverflow = 99999;
+constexpr int kUnderflow = -99999;
+
+// Struct representing the calculated conversion result of a positive (nonzero)
+// floating point number.
+//
+// The calculated number is mantissa * 2**exponent (mantissa is treated as an
+// integer.) `mantissa` is chosen to be the correct width for the IEEE float
+// representation being calculated. (`mantissa` will always have the same bit
+// width for normal values, and narrower bit widths for subnormals.)
+//
+// If the result of conversion was an underflow or overflow, exponent is set
+// to kUnderflow or kOverflow.
+struct CalculatedFloat {
+ uint64_t mantissa = 0;
+ int exponent = 0;
+};
+
+// Returns the bit width of the given uint128. (Equivalently, returns 128
+// minus the number of leading zero bits.)
+int BitWidth(uint128 value) {
+ if (Uint128High64(value) == 0) {
+ return 64 - base_internal::CountLeadingZeros64(Uint128Low64(value));
+ }
+ return 128 - base_internal::CountLeadingZeros64(Uint128High64(value));
+}
+
+// Calculates how far to the right a mantissa needs to be shifted to create a
+// properly adjusted mantissa for an IEEE floating point number.
+//
+// `mantissa_width` is the bit width of the mantissa to be shifted, and
+// `binary_exponent` is the exponent of the number before the shift.
+//
+// This accounts for subnormal values, and will return a larger-than-normal
+// shift if binary_exponent would otherwise be too low.
+template <typename FloatType>
+int NormalizedShiftSize(int mantissa_width, int binary_exponent) {
+ const int normal_shift =
+ mantissa_width - FloatTraits<FloatType>::kTargetMantissaBits;
+ const int minimum_shift =
+ FloatTraits<FloatType>::kMinNormalExponent - binary_exponent;
+ return std::max(normal_shift, minimum_shift);
+}
+
+// Right shifts a uint128 so that it has the requested bit width. (The
+// resulting value will have 128 - bit_width leading zeroes.) The initial
+// `value` must be wider than the requested bit width.
+//
+// Returns the number of bits shifted.
+int TruncateToBitWidth(int bit_width, uint128* value) {
+ const int current_bit_width = BitWidth(*value);
+ const int shift = current_bit_width - bit_width;
+ *value >>= shift;
+ return shift;
+}
+
+// Checks if the given ParsedFloat represents one of the edge cases that are
+// not dependent on number base: zero, infinity, or NaN. If so, sets *value
+// the appropriate double, and returns true.
+template <typename FloatType>
+bool HandleEdgeCase(const strings_internal::ParsedFloat& input, bool negative,
+ FloatType* value) {
+ if (input.type == strings_internal::FloatType::kNan) {
+ // A bug in both clang and gcc would cause the compiler to optimize away the
+ // buffer we are building below. Declaring the buffer volatile avoids the
+ // issue, and has no measurable performance impact in microbenchmarks.
+ //
+ // https://bugs.llvm.org/show_bug.cgi?id=37778
+ // https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86113
+ constexpr ptrdiff_t kNanBufferSize = 128;
+ volatile char n_char_sequence[kNanBufferSize];
+ if (input.subrange_begin == nullptr) {
+ n_char_sequence[0] = '\0';
+ } else {
+ ptrdiff_t nan_size = input.subrange_end - input.subrange_begin;
+ nan_size = std::min(nan_size, kNanBufferSize - 1);
+ std::copy_n(input.subrange_begin, nan_size, n_char_sequence);
+ n_char_sequence[nan_size] = '\0';
+ }
+ char* nan_argument = const_cast<char*>(n_char_sequence);
+ *value = negative ? -FloatTraits<FloatType>::MakeNan(nan_argument)
+ : FloatTraits<FloatType>::MakeNan(nan_argument);
+ return true;
+ }
+ if (input.type == strings_internal::FloatType::kInfinity) {
+ *value = negative ? -std::numeric_limits<FloatType>::infinity()
+ : std::numeric_limits<FloatType>::infinity();
+ return true;
+ }
+ if (input.mantissa == 0) {
+ *value = negative ? -0.0 : 0.0;
+ return true;
+ }
+ return false;
+}
+
+// Given a CalculatedFloat result of a from_chars conversion, generate the
+// correct output values.
+//
+// CalculatedFloat can represent an underflow or overflow, in which case the
+// error code in *result is set. Otherwise, the calculated floating point
+// number is stored in *value.
+template <typename FloatType>
+void EncodeResult(const CalculatedFloat& calculated, bool negative,
+ absl::from_chars_result* result, FloatType* value) {
+ if (calculated.exponent == kOverflow) {
+ result->ec = std::errc::result_out_of_range;
+ *value = negative ? -std::numeric_limits<FloatType>::max()
+ : std::numeric_limits<FloatType>::max();
+ return;
+ } else if (calculated.mantissa == 0 || calculated.exponent == kUnderflow) {
+ result->ec = std::errc::result_out_of_range;
+ *value = negative ? -0.0 : 0.0;
+ return;
+ }
+ *value = FloatTraits<FloatType>::Make(calculated.mantissa,
+ calculated.exponent, negative);
+}
+
+// Returns the given uint128 shifted to the right by `shift` bits, and rounds
+// the remaining bits using round_to_nearest logic. The value is returned as a
+// uint64_t, since this is the type used by this library for storing calculated
+// floating point mantissas.
+//
+// It is expected that the width of the input value shifted by `shift` will
+// be the correct bit-width for the target mantissa, which is strictly narrower
+// than a uint64_t.
+//
+// If `input_exact` is false, then a nonzero error epsilon is assumed. For
+// rounding purposes, the true value being rounded is strictly greater than the
+// input value. The error may represent a single lost carry bit.
+//
+// When input_exact, shifted bits of the form 1000000... represent a tie, which
+// is broken by rounding to even -- the rounding direction is chosen so the low
+// bit of the returned value is 0.
+//
+// When !input_exact, shifted bits of the form 10000000... represent a value
+// strictly greater than one half (due to the error epsilon), and so ties are
+// always broken by rounding up.
+//
+// When !input_exact, shifted bits of the form 01111111... are uncertain;
+// the true value may or may not be greater than 10000000..., due to the
+// possible lost carry bit. The correct rounding direction is unknown. In this
+// case, the result is rounded down, and `output_exact` is set to false.
+//
+// Zero and negative values of `shift` are accepted, in which case the word is
+// shifted left, as necessary.
+uint64_t ShiftRightAndRound(uint128 value, int shift, bool input_exact,
+ bool* output_exact) {
+ if (shift <= 0) {
+ *output_exact = input_exact;
+ return static_cast<uint64_t>(value << -shift);
+ }
+ if (shift >= 128) {
+ // Exponent is so small that we are shifting away all significant bits.
+ // Answer will not be representable, even as a subnormal, so return a zero
+ // mantissa (which represents underflow).
+ *output_exact = true;
+ return 0;
+ }
+
+ *output_exact = true;
+ const uint128 shift_mask = (uint128(1) << shift) - 1;
+ const uint128 halfway_point = uint128(1) << (shift - 1);
+
+ const uint128 shifted_bits = value & shift_mask;
+ value >>= shift;
+ if (shifted_bits > halfway_point) {
+ // Shifted bits greater than 10000... require rounding up.
+ return static_cast<uint64_t>(value + 1);
+ }
+ if (shifted_bits == halfway_point) {
+ // In exact mode, shifted bits of 10000... mean we're exactly halfway
+ // between two numbers, and we must round to even. So only round up if
+ // the low bit of `value` is set.
+ //
+ // In inexact mode, the nonzero error means the actual value is greater
+ // than the halfway point and we must alway round up.
+ if ((value & 1) == 1 || !input_exact) {
+ ++value;
+ }
+ return static_cast<uint64_t>(value);
+ }
+ if (!input_exact && shifted_bits == halfway_point - 1) {
+ // Rounding direction is unclear, due to error.
+ *output_exact = false;
+ }
+ // Otherwise, round down.
+ return static_cast<uint64_t>(value);
+}
+
+// Checks if a floating point guess needs to be rounded up, using high precision
+// math.
+//
+// `guess_mantissa` and `guess_exponent` represent a candidate guess for the
+// number represented by `parsed_decimal`.
+//
+// The exact number represented by `parsed_decimal` must lie between the two
+// numbers:
+// A = `guess_mantissa * 2**guess_exponent`
+// B = `(guess_mantissa + 1) * 2**guess_exponent`
+//
+// This function returns false if `A` is the better guess, and true if `B` is
+// the better guess, with rounding ties broken by rounding to even.
+bool MustRoundUp(uint64_t guess_mantissa, int guess_exponent,
+ const strings_internal::ParsedFloat& parsed_decimal) {
+ // 768 is the number of digits needed in the worst case. We could determine a
+ // better limit dynamically based on the value of parsed_decimal.exponent.
+ // This would optimize pathological input cases only. (Sane inputs won't have
+ // hundreds of digits of mantissa.)
+ absl::strings_internal::BigUnsigned<84> exact_mantissa;
+ int exact_exponent = exact_mantissa.ReadFloatMantissa(parsed_decimal, 768);
+
+ // Adjust the `guess` arguments to be halfway between A and B.
+ guess_mantissa = guess_mantissa * 2 + 1;
+ guess_exponent -= 1;
+
+ // In our comparison:
+ // lhs = exact = exact_mantissa * 10**exact_exponent
+ // = exact_mantissa * 5**exact_exponent * 2**exact_exponent
+ // rhs = guess = guess_mantissa * 2**guess_exponent
+ //
+ // Because we are doing integer math, we can't directly deal with negative
+ // exponents. We instead move these to the other side of the inequality.
+ absl::strings_internal::BigUnsigned<84>& lhs = exact_mantissa;
+ int comparison;
+ if (exact_exponent >= 0) {
+ lhs.MultiplyByFiveToTheNth(exact_exponent);
+ absl::strings_internal::BigUnsigned<84> rhs(guess_mantissa);
+ // There are powers of 2 on both sides of the inequality; reduce this to
+ // a single bit-shift.
+ if (exact_exponent > guess_exponent) {
+ lhs.ShiftLeft(exact_exponent - guess_exponent);
+ } else {
+ rhs.ShiftLeft(guess_exponent - exact_exponent);
+ }
+ comparison = Compare(lhs, rhs);
+ } else {
+ // Move the power of 5 to the other side of the equation, giving us:
+ // lhs = exact_mantissa * 2**exact_exponent
+ // rhs = guess_mantissa * 5**(-exact_exponent) * 2**guess_exponent
+ absl::strings_internal::BigUnsigned<84> rhs =
+ absl::strings_internal::BigUnsigned<84>::FiveToTheNth(-exact_exponent);
+ rhs.MultiplyBy(guess_mantissa);
+ if (exact_exponent > guess_exponent) {
+ lhs.ShiftLeft(exact_exponent - guess_exponent);
+ } else {
+ rhs.ShiftLeft(guess_exponent - exact_exponent);
+ }
+ comparison = Compare(lhs, rhs);
+ }
+ if (comparison < 0) {
+ return false;
+ } else if (comparison > 0) {
+ return true;
+ } else {
+ // When lhs == rhs, the decimal input is exactly between A and B.
+ // Round towards even -- round up only if the low bit of the initial
+ // `guess_mantissa` was a 1. We shifted guess_mantissa left 1 bit at
+ // the beginning of this function, so test the 2nd bit here.
+ return (guess_mantissa & 2) == 2;
+ }
+}
+
+// Constructs a CalculatedFloat from a given mantissa and exponent, but
+// with the following normalizations applied:
+//
+// If rounding has caused mantissa to increase just past the allowed bit
+// width, shift and adjust exponent.
+//
+// If exponent is too high, sets kOverflow.
+//
+// If mantissa is zero (representing a non-zero value not representable, even
+// as a subnormal), sets kUnderflow.
+template <typename FloatType>
+CalculatedFloat CalculatedFloatFromRawValues(uint64_t mantissa, int exponent) {
+ CalculatedFloat result;
+ if (mantissa == uint64_t(1) << FloatTraits<FloatType>::kTargetMantissaBits) {
+ mantissa >>= 1;
+ exponent += 1;
+ }
+ if (exponent > FloatTraits<FloatType>::kMaxExponent) {
+ result.exponent = kOverflow;
+ } else if (mantissa == 0) {
+ result.exponent = kUnderflow;
+ } else {
+ result.exponent = exponent;
+ result.mantissa = mantissa;
+ }
+ return result;
+}
+
+template <typename FloatType>
+CalculatedFloat CalculateFromParsedHexadecimal(
+ const strings_internal::ParsedFloat& parsed_hex) {
+ uint64_t mantissa = parsed_hex.mantissa;
+ int exponent = parsed_hex.exponent;
+ int mantissa_width = 64 - base_internal::CountLeadingZeros64(mantissa);
+ const int shift = NormalizedShiftSize<FloatType>(mantissa_width, exponent);
+ bool result_exact;
+ exponent += shift;
+ mantissa = ShiftRightAndRound(mantissa, shift,
+ /* input exact= */ true, &result_exact);
+ // ParseFloat handles rounding in the hexadecimal case, so we don't have to
+ // check `result_exact` here.
+ return CalculatedFloatFromRawValues<FloatType>(mantissa, exponent);
+}
+
+template <typename FloatType>
+CalculatedFloat CalculateFromParsedDecimal(
+ const strings_internal::ParsedFloat& parsed_decimal) {
+ CalculatedFloat result;
+
+ // Large or small enough decimal exponents will always result in overflow
+ // or underflow.
+ if (Power10Underflow(parsed_decimal.exponent)) {
+ result.exponent = kUnderflow;
+ return result;
+ } else if (Power10Overflow(parsed_decimal.exponent)) {
+ result.exponent = kOverflow;
+ return result;
+ }
+
+ // Otherwise convert our power of 10 into a power of 2 times an integer
+ // mantissa, and multiply this by our parsed decimal mantissa.
+ uint128 wide_binary_mantissa = parsed_decimal.mantissa;
+ wide_binary_mantissa *= Power10Mantissa(parsed_decimal.exponent);
+ int binary_exponent = Power10Exponent(parsed_decimal.exponent);
+
+ // Discard bits that are inaccurate due to truncation error. The magic
+ // `mantissa_width` constants below are justified in
+ // https://abseil.io/about/design/charconv. They represent the number of bits
+ // in `wide_binary_mantissa` that are guaranteed to be unaffected by error
+ // propagation.
+ bool mantissa_exact;
+ int mantissa_width;
+ if (parsed_decimal.subrange_begin) {
+ // Truncated mantissa
+ mantissa_width = 58;
+ mantissa_exact = false;
+ binary_exponent +=
+ TruncateToBitWidth(mantissa_width, &wide_binary_mantissa);
+ } else if (!Power10Exact(parsed_decimal.exponent)) {
+ // Exact mantissa, truncated power of ten
+ mantissa_width = 63;
+ mantissa_exact = false;
+ binary_exponent +=
+ TruncateToBitWidth(mantissa_width, &wide_binary_mantissa);
+ } else {
+ // Product is exact
+ mantissa_width = BitWidth(wide_binary_mantissa);
+ mantissa_exact = true;
+ }
+
+ // Shift into an FloatType-sized mantissa, and round to nearest.
+ const int shift =
+ NormalizedShiftSize<FloatType>(mantissa_width, binary_exponent);
+ bool result_exact;
+ binary_exponent += shift;
+ uint64_t binary_mantissa = ShiftRightAndRound(wide_binary_mantissa, shift,
+ mantissa_exact, &result_exact);
+ if (!result_exact) {
+ // We could not determine the rounding direction using int128 math. Use
+ // full resolution math instead.
+ if (MustRoundUp(binary_mantissa, binary_exponent, parsed_decimal)) {
+ binary_mantissa += 1;
+ }
+ }
+
+ return CalculatedFloatFromRawValues<FloatType>(binary_mantissa,
+ binary_exponent);
+}
+
+template <typename FloatType>
+from_chars_result FromCharsImpl(const char* first, const char* last,
+ FloatType& value, chars_format fmt_flags) {
+ from_chars_result result;
+ result.ptr = first; // overwritten on successful parse
+ result.ec = std::errc();
+
+ bool negative = false;
+ if (first != last && *first == '-') {
+ ++first;
+ negative = true;
+ }
+ // If the `hex` flag is *not* set, then we will accept a 0x prefix and try
+ // to parse a hexadecimal float.
+ if ((fmt_flags & chars_format::hex) == chars_format{} && last - first >= 2 &&
+ *first == '0' && (first[1] == 'x' || first[1] == 'X')) {
+ const char* hex_first = first + 2;
+ strings_internal::ParsedFloat hex_parse =
+ strings_internal::ParseFloat<16>(hex_first, last, fmt_flags);
+ if (hex_parse.end == nullptr ||
+ hex_parse.type != strings_internal::FloatType::kNumber) {
+ // Either we failed to parse a hex float after the "0x", or we read
+ // "0xinf" or "0xnan" which we don't want to match.
+ //
+ // However, a string that begins with "0x" also begins with "0", which
+ // is normally a valid match for the number zero. So we want these
+ // strings to match zero unless fmt_flags is `scientific`. (This flag
+ // means an exponent is required, which the string "0" does not have.)
+ if (fmt_flags == chars_format::scientific) {
+ result.ec = std::errc::invalid_argument;
+ } else {
+ result.ptr = first + 1;
+ value = negative ? -0.0 : 0.0;
+ }
+ return result;
+ }
+ // We matched a value.
+ result.ptr = hex_parse.end;
+ if (HandleEdgeCase(hex_parse, negative, &value)) {
+ return result;
+ }
+ CalculatedFloat calculated =
+ CalculateFromParsedHexadecimal<FloatType>(hex_parse);
+ EncodeResult(calculated, negative, &result, &value);
+ return result;
+ }
+ // Otherwise, we choose the number base based on the flags.
+ if ((fmt_flags & chars_format::hex) == chars_format::hex) {
+ strings_internal::ParsedFloat hex_parse =
+ strings_internal::ParseFloat<16>(first, last, fmt_flags);
+ if (hex_parse.end == nullptr) {
+ result.ec = std::errc::invalid_argument;
+ return result;
+ }
+ result.ptr = hex_parse.end;
+ if (HandleEdgeCase(hex_parse, negative, &value)) {
+ return result;
+ }
+ CalculatedFloat calculated =
+ CalculateFromParsedHexadecimal<FloatType>(hex_parse);
+ EncodeResult(calculated, negative, &result, &value);
+ return result;
+ } else {
+ strings_internal::ParsedFloat decimal_parse =
+ strings_internal::ParseFloat<10>(first, last, fmt_flags);
+ if (decimal_parse.end == nullptr) {
+ result.ec = std::errc::invalid_argument;
+ return result;
+ }
+ result.ptr = decimal_parse.end;
+ if (HandleEdgeCase(decimal_parse, negative, &value)) {
+ return result;
+ }
+ CalculatedFloat calculated =
+ CalculateFromParsedDecimal<FloatType>(decimal_parse);
+ EncodeResult(calculated, negative, &result, &value);
+ return result;
+ }
+}
+} // namespace
+
+from_chars_result from_chars(const char* first, const char* last, double& value,
+ chars_format fmt) {
+ return FromCharsImpl(first, last, value, fmt);
+}
+
+from_chars_result from_chars(const char* first, const char* last, float& value,
+ chars_format fmt) {
+ return FromCharsImpl(first, last, value, fmt);
+}
+
+namespace {
+
+// Table of powers of 10, from kPower10TableMin to kPower10TableMax.
+//
+// kPower10MantissaTable[i - kPower10TableMin] stores the 64-bit mantissa (high
+// bit always on), and kPower10ExponentTable[i - kPower10TableMin] stores the
+// power-of-two exponent. For a given number i, this gives the unique mantissa
+// and exponent such that mantissa * 2**exponent <= 10**i < (mantissa + 1) *
+// 2**exponent.
+
+const uint64_t kPower10MantissaTable[] = {
+ 0xeef453d6923bd65aU, 0x9558b4661b6565f8U, 0xbaaee17fa23ebf76U,
+ 0xe95a99df8ace6f53U, 0x91d8a02bb6c10594U, 0xb64ec836a47146f9U,
+ 0xe3e27a444d8d98b7U, 0x8e6d8c6ab0787f72U, 0xb208ef855c969f4fU,
+ 0xde8b2b66b3bc4723U, 0x8b16fb203055ac76U, 0xaddcb9e83c6b1793U,
+ 0xd953e8624b85dd78U, 0x87d4713d6f33aa6bU, 0xa9c98d8ccb009506U,
+ 0xd43bf0effdc0ba48U, 0x84a57695fe98746dU, 0xa5ced43b7e3e9188U,
+ 0xcf42894a5dce35eaU, 0x818995ce7aa0e1b2U, 0xa1ebfb4219491a1fU,
+ 0xca66fa129f9b60a6U, 0xfd00b897478238d0U, 0x9e20735e8cb16382U,
+ 0xc5a890362fddbc62U, 0xf712b443bbd52b7bU, 0x9a6bb0aa55653b2dU,
+ 0xc1069cd4eabe89f8U, 0xf148440a256e2c76U, 0x96cd2a865764dbcaU,
+ 0xbc807527ed3e12bcU, 0xeba09271e88d976bU, 0x93445b8731587ea3U,
+ 0xb8157268fdae9e4cU, 0xe61acf033d1a45dfU, 0x8fd0c16206306babU,
+ 0xb3c4f1ba87bc8696U, 0xe0b62e2929aba83cU, 0x8c71dcd9ba0b4925U,
+ 0xaf8e5410288e1b6fU, 0xdb71e91432b1a24aU, 0x892731ac9faf056eU,
+ 0xab70fe17c79ac6caU, 0xd64d3d9db981787dU, 0x85f0468293f0eb4eU,
+ 0xa76c582338ed2621U, 0xd1476e2c07286faaU, 0x82cca4db847945caU,
+ 0xa37fce126597973cU, 0xcc5fc196fefd7d0cU, 0xff77b1fcbebcdc4fU,
+ 0x9faacf3df73609b1U, 0xc795830d75038c1dU, 0xf97ae3d0d2446f25U,
+ 0x9becce62836ac577U, 0xc2e801fb244576d5U, 0xf3a20279ed56d48aU,
+ 0x9845418c345644d6U, 0xbe5691ef416bd60cU, 0xedec366b11c6cb8fU,
+ 0x94b3a202eb1c3f39U, 0xb9e08a83a5e34f07U, 0xe858ad248f5c22c9U,
+ 0x91376c36d99995beU, 0xb58547448ffffb2dU, 0xe2e69915b3fff9f9U,
+ 0x8dd01fad907ffc3bU, 0xb1442798f49ffb4aU, 0xdd95317f31c7fa1dU,
+ 0x8a7d3eef7f1cfc52U, 0xad1c8eab5ee43b66U, 0xd863b256369d4a40U,
+ 0x873e4f75e2224e68U, 0xa90de3535aaae202U, 0xd3515c2831559a83U,
+ 0x8412d9991ed58091U, 0xa5178fff668ae0b6U, 0xce5d73ff402d98e3U,
+ 0x80fa687f881c7f8eU, 0xa139029f6a239f72U, 0xc987434744ac874eU,
+ 0xfbe9141915d7a922U, 0x9d71ac8fada6c9b5U, 0xc4ce17b399107c22U,
+ 0xf6019da07f549b2bU, 0x99c102844f94e0fbU, 0xc0314325637a1939U,
+ 0xf03d93eebc589f88U, 0x96267c7535b763b5U, 0xbbb01b9283253ca2U,
+ 0xea9c227723ee8bcbU, 0x92a1958a7675175fU, 0xb749faed14125d36U,
+ 0xe51c79a85916f484U, 0x8f31cc0937ae58d2U, 0xb2fe3f0b8599ef07U,
+ 0xdfbdcece67006ac9U, 0x8bd6a141006042bdU, 0xaecc49914078536dU,
+ 0xda7f5bf590966848U, 0x888f99797a5e012dU, 0xaab37fd7d8f58178U,
+ 0xd5605fcdcf32e1d6U, 0x855c3be0a17fcd26U, 0xa6b34ad8c9dfc06fU,
+ 0xd0601d8efc57b08bU, 0x823c12795db6ce57U, 0xa2cb1717b52481edU,
+ 0xcb7ddcdda26da268U, 0xfe5d54150b090b02U, 0x9efa548d26e5a6e1U,
+ 0xc6b8e9b0709f109aU, 0xf867241c8cc6d4c0U, 0x9b407691d7fc44f8U,
+ 0xc21094364dfb5636U, 0xf294b943e17a2bc4U, 0x979cf3ca6cec5b5aU,
+ 0xbd8430bd08277231U, 0xece53cec4a314ebdU, 0x940f4613ae5ed136U,
+ 0xb913179899f68584U, 0xe757dd7ec07426e5U, 0x9096ea6f3848984fU,
+ 0xb4bca50b065abe63U, 0xe1ebce4dc7f16dfbU, 0x8d3360f09cf6e4bdU,
+ 0xb080392cc4349decU, 0xdca04777f541c567U, 0x89e42caaf9491b60U,
+ 0xac5d37d5b79b6239U, 0xd77485cb25823ac7U, 0x86a8d39ef77164bcU,
+ 0xa8530886b54dbdebU, 0xd267caa862a12d66U, 0x8380dea93da4bc60U,
+ 0xa46116538d0deb78U, 0xcd795be870516656U, 0x806bd9714632dff6U,
+ 0xa086cfcd97bf97f3U, 0xc8a883c0fdaf7df0U, 0xfad2a4b13d1b5d6cU,
+ 0x9cc3a6eec6311a63U, 0xc3f490aa77bd60fcU, 0xf4f1b4d515acb93bU,
+ 0x991711052d8bf3c5U, 0xbf5cd54678eef0b6U, 0xef340a98172aace4U,
+ 0x9580869f0e7aac0eU, 0xbae0a846d2195712U, 0xe998d258869facd7U,
+ 0x91ff83775423cc06U, 0xb67f6455292cbf08U, 0xe41f3d6a7377eecaU,
+ 0x8e938662882af53eU, 0xb23867fb2a35b28dU, 0xdec681f9f4c31f31U,
+ 0x8b3c113c38f9f37eU, 0xae0b158b4738705eU, 0xd98ddaee19068c76U,
+ 0x87f8a8d4cfa417c9U, 0xa9f6d30a038d1dbcU, 0xd47487cc8470652bU,
+ 0x84c8d4dfd2c63f3bU, 0xa5fb0a17c777cf09U, 0xcf79cc9db955c2ccU,
+ 0x81ac1fe293d599bfU, 0xa21727db38cb002fU, 0xca9cf1d206fdc03bU,
+ 0xfd442e4688bd304aU, 0x9e4a9cec15763e2eU, 0xc5dd44271ad3cdbaU,
+ 0xf7549530e188c128U, 0x9a94dd3e8cf578b9U, 0xc13a148e3032d6e7U,
+ 0xf18899b1bc3f8ca1U, 0x96f5600f15a7b7e5U, 0xbcb2b812db11a5deU,
+ 0xebdf661791d60f56U, 0x936b9fcebb25c995U, 0xb84687c269ef3bfbU,
+ 0xe65829b3046b0afaU, 0x8ff71a0fe2c2e6dcU, 0xb3f4e093db73a093U,
+ 0xe0f218b8d25088b8U, 0x8c974f7383725573U, 0xafbd2350644eeacfU,
+ 0xdbac6c247d62a583U, 0x894bc396ce5da772U, 0xab9eb47c81f5114fU,
+ 0xd686619ba27255a2U, 0x8613fd0145877585U, 0xa798fc4196e952e7U,
+ 0xd17f3b51fca3a7a0U, 0x82ef85133de648c4U, 0xa3ab66580d5fdaf5U,
+ 0xcc963fee10b7d1b3U, 0xffbbcfe994e5c61fU, 0x9fd561f1fd0f9bd3U,
+ 0xc7caba6e7c5382c8U, 0xf9bd690a1b68637bU, 0x9c1661a651213e2dU,
+ 0xc31bfa0fe5698db8U, 0xf3e2f893dec3f126U, 0x986ddb5c6b3a76b7U,
+ 0xbe89523386091465U, 0xee2ba6c0678b597fU, 0x94db483840b717efU,
+ 0xba121a4650e4ddebU, 0xe896a0d7e51e1566U, 0x915e2486ef32cd60U,
+ 0xb5b5ada8aaff80b8U, 0xe3231912d5bf60e6U, 0x8df5efabc5979c8fU,
+ 0xb1736b96b6fd83b3U, 0xddd0467c64bce4a0U, 0x8aa22c0dbef60ee4U,
+ 0xad4ab7112eb3929dU, 0xd89d64d57a607744U, 0x87625f056c7c4a8bU,
+ 0xa93af6c6c79b5d2dU, 0xd389b47879823479U, 0x843610cb4bf160cbU,
+ 0xa54394fe1eedb8feU, 0xce947a3da6a9273eU, 0x811ccc668829b887U,
+ 0xa163ff802a3426a8U, 0xc9bcff6034c13052U, 0xfc2c3f3841f17c67U,
+ 0x9d9ba7832936edc0U, 0xc5029163f384a931U, 0xf64335bcf065d37dU,
+ 0x99ea0196163fa42eU, 0xc06481fb9bcf8d39U, 0xf07da27a82c37088U,
+ 0x964e858c91ba2655U, 0xbbe226efb628afeaU, 0xeadab0aba3b2dbe5U,
+ 0x92c8ae6b464fc96fU, 0xb77ada0617e3bbcbU, 0xe55990879ddcaabdU,
+ 0x8f57fa54c2a9eab6U, 0xb32df8e9f3546564U, 0xdff9772470297ebdU,
+ 0x8bfbea76c619ef36U, 0xaefae51477a06b03U, 0xdab99e59958885c4U,
+ 0x88b402f7fd75539bU, 0xaae103b5fcd2a881U, 0xd59944a37c0752a2U,
+ 0x857fcae62d8493a5U, 0xa6dfbd9fb8e5b88eU, 0xd097ad07a71f26b2U,
+ 0x825ecc24c873782fU, 0xa2f67f2dfa90563bU, 0xcbb41ef979346bcaU,
+ 0xfea126b7d78186bcU, 0x9f24b832e6b0f436U, 0xc6ede63fa05d3143U,
+ 0xf8a95fcf88747d94U, 0x9b69dbe1b548ce7cU, 0xc24452da229b021bU,
+ 0xf2d56790ab41c2a2U, 0x97c560ba6b0919a5U, 0xbdb6b8e905cb600fU,
+ 0xed246723473e3813U, 0x9436c0760c86e30bU, 0xb94470938fa89bceU,
+ 0xe7958cb87392c2c2U, 0x90bd77f3483bb9b9U, 0xb4ecd5f01a4aa828U,
+ 0xe2280b6c20dd5232U, 0x8d590723948a535fU, 0xb0af48ec79ace837U,
+ 0xdcdb1b2798182244U, 0x8a08f0f8bf0f156bU, 0xac8b2d36eed2dac5U,
+ 0xd7adf884aa879177U, 0x86ccbb52ea94baeaU, 0xa87fea27a539e9a5U,
+ 0xd29fe4b18e88640eU, 0x83a3eeeef9153e89U, 0xa48ceaaab75a8e2bU,
+ 0xcdb02555653131b6U, 0x808e17555f3ebf11U, 0xa0b19d2ab70e6ed6U,
+ 0xc8de047564d20a8bU, 0xfb158592be068d2eU, 0x9ced737bb6c4183dU,
+ 0xc428d05aa4751e4cU, 0xf53304714d9265dfU, 0x993fe2c6d07b7fabU,
+ 0xbf8fdb78849a5f96U, 0xef73d256a5c0f77cU, 0x95a8637627989aadU,
+ 0xbb127c53b17ec159U, 0xe9d71b689dde71afU, 0x9226712162ab070dU,
+ 0xb6b00d69bb55c8d1U, 0xe45c10c42a2b3b05U, 0x8eb98a7a9a5b04e3U,
+ 0xb267ed1940f1c61cU, 0xdf01e85f912e37a3U, 0x8b61313bbabce2c6U,
+ 0xae397d8aa96c1b77U, 0xd9c7dced53c72255U, 0x881cea14545c7575U,
+ 0xaa242499697392d2U, 0xd4ad2dbfc3d07787U, 0x84ec3c97da624ab4U,
+ 0xa6274bbdd0fadd61U, 0xcfb11ead453994baU, 0x81ceb32c4b43fcf4U,
+ 0xa2425ff75e14fc31U, 0xcad2f7f5359a3b3eU, 0xfd87b5f28300ca0dU,
+ 0x9e74d1b791e07e48U, 0xc612062576589ddaU, 0xf79687aed3eec551U,
+ 0x9abe14cd44753b52U, 0xc16d9a0095928a27U, 0xf1c90080baf72cb1U,
+ 0x971da05074da7beeU, 0xbce5086492111aeaU, 0xec1e4a7db69561a5U,
+ 0x9392ee8e921d5d07U, 0xb877aa3236a4b449U, 0xe69594bec44de15bU,
+ 0x901d7cf73ab0acd9U, 0xb424dc35095cd80fU, 0xe12e13424bb40e13U,
+ 0x8cbccc096f5088cbU, 0xafebff0bcb24aafeU, 0xdbe6fecebdedd5beU,
+ 0x89705f4136b4a597U, 0xabcc77118461cefcU, 0xd6bf94d5e57a42bcU,
+ 0x8637bd05af6c69b5U, 0xa7c5ac471b478423U, 0xd1b71758e219652bU,
+ 0x83126e978d4fdf3bU, 0xa3d70a3d70a3d70aU, 0xccccccccccccccccU,
+ 0x8000000000000000U, 0xa000000000000000U, 0xc800000000000000U,
+ 0xfa00000000000000U, 0x9c40000000000000U, 0xc350000000000000U,
+ 0xf424000000000000U, 0x9896800000000000U, 0xbebc200000000000U,
+ 0xee6b280000000000U, 0x9502f90000000000U, 0xba43b74000000000U,
+ 0xe8d4a51000000000U, 0x9184e72a00000000U, 0xb5e620f480000000U,
+ 0xe35fa931a0000000U, 0x8e1bc9bf04000000U, 0xb1a2bc2ec5000000U,
+ 0xde0b6b3a76400000U, 0x8ac7230489e80000U, 0xad78ebc5ac620000U,
+ 0xd8d726b7177a8000U, 0x878678326eac9000U, 0xa968163f0a57b400U,
+ 0xd3c21bcecceda100U, 0x84595161401484a0U, 0xa56fa5b99019a5c8U,
+ 0xcecb8f27f4200f3aU, 0x813f3978f8940984U, 0xa18f07d736b90be5U,
+ 0xc9f2c9cd04674edeU, 0xfc6f7c4045812296U, 0x9dc5ada82b70b59dU,
+ 0xc5371912364ce305U, 0xf684df56c3e01bc6U, 0x9a130b963a6c115cU,
+ 0xc097ce7bc90715b3U, 0xf0bdc21abb48db20U, 0x96769950b50d88f4U,
+ 0xbc143fa4e250eb31U, 0xeb194f8e1ae525fdU, 0x92efd1b8d0cf37beU,
+ 0xb7abc627050305adU, 0xe596b7b0c643c719U, 0x8f7e32ce7bea5c6fU,
+ 0xb35dbf821ae4f38bU, 0xe0352f62a19e306eU, 0x8c213d9da502de45U,
+ 0xaf298d050e4395d6U, 0xdaf3f04651d47b4cU, 0x88d8762bf324cd0fU,
+ 0xab0e93b6efee0053U, 0xd5d238a4abe98068U, 0x85a36366eb71f041U,
+ 0xa70c3c40a64e6c51U, 0xd0cf4b50cfe20765U, 0x82818f1281ed449fU,
+ 0xa321f2d7226895c7U, 0xcbea6f8ceb02bb39U, 0xfee50b7025c36a08U,
+ 0x9f4f2726179a2245U, 0xc722f0ef9d80aad6U, 0xf8ebad2b84e0d58bU,
+ 0x9b934c3b330c8577U, 0xc2781f49ffcfa6d5U, 0xf316271c7fc3908aU,
+ 0x97edd871cfda3a56U, 0xbde94e8e43d0c8ecU, 0xed63a231d4c4fb27U,
+ 0x945e455f24fb1cf8U, 0xb975d6b6ee39e436U, 0xe7d34c64a9c85d44U,
+ 0x90e40fbeea1d3a4aU, 0xb51d13aea4a488ddU, 0xe264589a4dcdab14U,
+ 0x8d7eb76070a08aecU, 0xb0de65388cc8ada8U, 0xdd15fe86affad912U,
+ 0x8a2dbf142dfcc7abU, 0xacb92ed9397bf996U, 0xd7e77a8f87daf7fbU,
+ 0x86f0ac99b4e8dafdU, 0xa8acd7c0222311bcU, 0xd2d80db02aabd62bU,
+ 0x83c7088e1aab65dbU, 0xa4b8cab1a1563f52U, 0xcde6fd5e09abcf26U,
+ 0x80b05e5ac60b6178U, 0xa0dc75f1778e39d6U, 0xc913936dd571c84cU,
+ 0xfb5878494ace3a5fU, 0x9d174b2dcec0e47bU, 0xc45d1df942711d9aU,
+ 0xf5746577930d6500U, 0x9968bf6abbe85f20U, 0xbfc2ef456ae276e8U,
+ 0xefb3ab16c59b14a2U, 0x95d04aee3b80ece5U, 0xbb445da9ca61281fU,
+ 0xea1575143cf97226U, 0x924d692ca61be758U, 0xb6e0c377cfa2e12eU,
+ 0xe498f455c38b997aU, 0x8edf98b59a373fecU, 0xb2977ee300c50fe7U,
+ 0xdf3d5e9bc0f653e1U, 0x8b865b215899f46cU, 0xae67f1e9aec07187U,
+ 0xda01ee641a708de9U, 0x884134fe908658b2U, 0xaa51823e34a7eedeU,
+ 0xd4e5e2cdc1d1ea96U, 0x850fadc09923329eU, 0xa6539930bf6bff45U,
+ 0xcfe87f7cef46ff16U, 0x81f14fae158c5f6eU, 0xa26da3999aef7749U,
+ 0xcb090c8001ab551cU, 0xfdcb4fa002162a63U, 0x9e9f11c4014dda7eU,
+ 0xc646d63501a1511dU, 0xf7d88bc24209a565U, 0x9ae757596946075fU,
+ 0xc1a12d2fc3978937U, 0xf209787bb47d6b84U, 0x9745eb4d50ce6332U,
+ 0xbd176620a501fbffU, 0xec5d3fa8ce427affU, 0x93ba47c980e98cdfU,
+ 0xb8a8d9bbe123f017U, 0xe6d3102ad96cec1dU, 0x9043ea1ac7e41392U,
+ 0xb454e4a179dd1877U, 0xe16a1dc9d8545e94U, 0x8ce2529e2734bb1dU,
+ 0xb01ae745b101e9e4U, 0xdc21a1171d42645dU, 0x899504ae72497ebaU,
+ 0xabfa45da0edbde69U, 0xd6f8d7509292d603U, 0x865b86925b9bc5c2U,
+ 0xa7f26836f282b732U, 0xd1ef0244af2364ffU, 0x8335616aed761f1fU,
+ 0xa402b9c5a8d3a6e7U, 0xcd036837130890a1U, 0x802221226be55a64U,
+ 0xa02aa96b06deb0fdU, 0xc83553c5c8965d3dU, 0xfa42a8b73abbf48cU,
+ 0x9c69a97284b578d7U, 0xc38413cf25e2d70dU, 0xf46518c2ef5b8cd1U,
+ 0x98bf2f79d5993802U, 0xbeeefb584aff8603U, 0xeeaaba2e5dbf6784U,
+ 0x952ab45cfa97a0b2U, 0xba756174393d88dfU, 0xe912b9d1478ceb17U,
+ 0x91abb422ccb812eeU, 0xb616a12b7fe617aaU, 0xe39c49765fdf9d94U,
+ 0x8e41ade9fbebc27dU, 0xb1d219647ae6b31cU, 0xde469fbd99a05fe3U,
+ 0x8aec23d680043beeU, 0xada72ccc20054ae9U, 0xd910f7ff28069da4U,
+ 0x87aa9aff79042286U, 0xa99541bf57452b28U, 0xd3fa922f2d1675f2U,
+ 0x847c9b5d7c2e09b7U, 0xa59bc234db398c25U, 0xcf02b2c21207ef2eU,
+ 0x8161afb94b44f57dU, 0xa1ba1ba79e1632dcU, 0xca28a291859bbf93U,
+ 0xfcb2cb35e702af78U, 0x9defbf01b061adabU, 0xc56baec21c7a1916U,
+ 0xf6c69a72a3989f5bU, 0x9a3c2087a63f6399U, 0xc0cb28a98fcf3c7fU,
+ 0xf0fdf2d3f3c30b9fU, 0x969eb7c47859e743U, 0xbc4665b596706114U,
+ 0xeb57ff22fc0c7959U, 0x9316ff75dd87cbd8U, 0xb7dcbf5354e9beceU,
+ 0xe5d3ef282a242e81U, 0x8fa475791a569d10U, 0xb38d92d760ec4455U,
+ 0xe070f78d3927556aU, 0x8c469ab843b89562U, 0xaf58416654a6babbU,
+ 0xdb2e51bfe9d0696aU, 0x88fcf317f22241e2U, 0xab3c2fddeeaad25aU,
+ 0xd60b3bd56a5586f1U, 0x85c7056562757456U, 0xa738c6bebb12d16cU,
+ 0xd106f86e69d785c7U, 0x82a45b450226b39cU, 0xa34d721642b06084U,
+ 0xcc20ce9bd35c78a5U, 0xff290242c83396ceU, 0x9f79a169bd203e41U,
+ 0xc75809c42c684dd1U, 0xf92e0c3537826145U, 0x9bbcc7a142b17ccbU,
+ 0xc2abf989935ddbfeU, 0xf356f7ebf83552feU, 0x98165af37b2153deU,
+ 0xbe1bf1b059e9a8d6U, 0xeda2ee1c7064130cU, 0x9485d4d1c63e8be7U,
+ 0xb9a74a0637ce2ee1U, 0xe8111c87c5c1ba99U, 0x910ab1d4db9914a0U,
+ 0xb54d5e4a127f59c8U, 0xe2a0b5dc971f303aU, 0x8da471a9de737e24U,
+ 0xb10d8e1456105dadU, 0xdd50f1996b947518U, 0x8a5296ffe33cc92fU,
+ 0xace73cbfdc0bfb7bU, 0xd8210befd30efa5aU, 0x8714a775e3e95c78U,
+ 0xa8d9d1535ce3b396U, 0xd31045a8341ca07cU, 0x83ea2b892091e44dU,
+ 0xa4e4b66b68b65d60U, 0xce1de40642e3f4b9U, 0x80d2ae83e9ce78f3U,
+ 0xa1075a24e4421730U, 0xc94930ae1d529cfcU, 0xfb9b7cd9a4a7443cU,
+ 0x9d412e0806e88aa5U, 0xc491798a08a2ad4eU, 0xf5b5d7ec8acb58a2U,
+ 0x9991a6f3d6bf1765U, 0xbff610b0cc6edd3fU, 0xeff394dcff8a948eU,
+ 0x95f83d0a1fb69cd9U, 0xbb764c4ca7a4440fU, 0xea53df5fd18d5513U,
+ 0x92746b9be2f8552cU, 0xb7118682dbb66a77U, 0xe4d5e82392a40515U,
+ 0x8f05b1163ba6832dU, 0xb2c71d5bca9023f8U, 0xdf78e4b2bd342cf6U,
+ 0x8bab8eefb6409c1aU, 0xae9672aba3d0c320U, 0xda3c0f568cc4f3e8U,
+ 0x8865899617fb1871U, 0xaa7eebfb9df9de8dU, 0xd51ea6fa85785631U,
+ 0x8533285c936b35deU, 0xa67ff273b8460356U, 0xd01fef10a657842cU,
+ 0x8213f56a67f6b29bU, 0xa298f2c501f45f42U, 0xcb3f2f7642717713U,
+ 0xfe0efb53d30dd4d7U, 0x9ec95d1463e8a506U, 0xc67bb4597ce2ce48U,
+ 0xf81aa16fdc1b81daU, 0x9b10a4e5e9913128U, 0xc1d4ce1f63f57d72U,
+ 0xf24a01a73cf2dccfU, 0x976e41088617ca01U, 0xbd49d14aa79dbc82U,
+ 0xec9c459d51852ba2U, 0x93e1ab8252f33b45U, 0xb8da1662e7b00a17U,
+ 0xe7109bfba19c0c9dU, 0x906a617d450187e2U, 0xb484f9dc9641e9daU,
+ 0xe1a63853bbd26451U, 0x8d07e33455637eb2U, 0xb049dc016abc5e5fU,
+ 0xdc5c5301c56b75f7U, 0x89b9b3e11b6329baU, 0xac2820d9623bf429U,
+ 0xd732290fbacaf133U, 0x867f59a9d4bed6c0U, 0xa81f301449ee8c70U,
+ 0xd226fc195c6a2f8cU, 0x83585d8fd9c25db7U, 0xa42e74f3d032f525U,
+ 0xcd3a1230c43fb26fU, 0x80444b5e7aa7cf85U, 0xa0555e361951c366U,
+ 0xc86ab5c39fa63440U, 0xfa856334878fc150U, 0x9c935e00d4b9d8d2U,
+ 0xc3b8358109e84f07U, 0xf4a642e14c6262c8U, 0x98e7e9cccfbd7dbdU,
+ 0xbf21e44003acdd2cU, 0xeeea5d5004981478U, 0x95527a5202df0ccbU,
+ 0xbaa718e68396cffdU, 0xe950df20247c83fdU, 0x91d28b7416cdd27eU,
+ 0xb6472e511c81471dU, 0xe3d8f9e563a198e5U, 0x8e679c2f5e44ff8fU,
+};
+
+const int16_t kPower10ExponentTable[] = {
+ -1200, -1196, -1193, -1190, -1186, -1183, -1180, -1176, -1173, -1170, -1166,
+ -1163, -1160, -1156, -1153, -1150, -1146, -1143, -1140, -1136, -1133, -1130,
+ -1127, -1123, -1120, -1117, -1113, -1110, -1107, -1103, -1100, -1097, -1093,
+ -1090, -1087, -1083, -1080, -1077, -1073, -1070, -1067, -1063, -1060, -1057,
+ -1053, -1050, -1047, -1043, -1040, -1037, -1034, -1030, -1027, -1024, -1020,
+ -1017, -1014, -1010, -1007, -1004, -1000, -997, -994, -990, -987, -984,
+ -980, -977, -974, -970, -967, -964, -960, -957, -954, -950, -947,
+ -944, -940, -937, -934, -931, -927, -924, -921, -917, -914, -911,
+ -907, -904, -901, -897, -894, -891, -887, -884, -881, -877, -874,
+ -871, -867, -864, -861, -857, -854, -851, -847, -844, -841, -838,
+ -834, -831, -828, -824, -821, -818, -814, -811, -808, -804, -801,
+ -798, -794, -791, -788, -784, -781, -778, -774, -771, -768, -764,
+ -761, -758, -754, -751, -748, -744, -741, -738, -735, -731, -728,
+ -725, -721, -718, -715, -711, -708, -705, -701, -698, -695, -691,
+ -688, -685, -681, -678, -675, -671, -668, -665, -661, -658, -655,
+ -651, -648, -645, -642, -638, -635, -632, -628, -625, -622, -618,
+ -615, -612, -608, -605, -602, -598, -595, -592, -588, -585, -582,
+ -578, -575, -572, -568, -565, -562, -558, -555, -552, -549, -545,
+ -542, -539, -535, -532, -529, -525, -522, -519, -515, -512, -509,
+ -505, -502, -499, -495, -492, -489, -485, -482, -479, -475, -472,
+ -469, -465, -462, -459, -455, -452, -449, -446, -442, -439, -436,
+ -432, -429, -426, -422, -419, -416, -412, -409, -406, -402, -399,
+ -396, -392, -389, -386, -382, -379, -376, -372, -369, -366, -362,
+ -359, -356, -353, -349, -346, -343, -339, -336, -333, -329, -326,
+ -323, -319, -316, -313, -309, -306, -303, -299, -296, -293, -289,
+ -286, -283, -279, -276, -273, -269, -266, -263, -259, -256, -253,
+ -250, -246, -243, -240, -236, -233, -230, -226, -223, -220, -216,
+ -213, -210, -206, -203, -200, -196, -193, -190, -186, -183, -180,
+ -176, -173, -170, -166, -163, -160, -157, -153, -150, -147, -143,
+ -140, -137, -133, -130, -127, -123, -120, -117, -113, -110, -107,
+ -103, -100, -97, -93, -90, -87, -83, -80, -77, -73, -70,
+ -67, -63, -60, -57, -54, -50, -47, -44, -40, -37, -34,
+ -30, -27, -24, -20, -17, -14, -10, -7, -4, 0, 3,
+ 6, 10, 13, 16, 20, 23, 26, 30, 33, 36, 39,
+ 43, 46, 49, 53, 56, 59, 63, 66, 69, 73, 76,
+ 79, 83, 86, 89, 93, 96, 99, 103, 106, 109, 113,
+ 116, 119, 123, 126, 129, 132, 136, 139, 142, 146, 149,
+ 152, 156, 159, 162, 166, 169, 172, 176, 179, 182, 186,
+ 189, 192, 196, 199, 202, 206, 209, 212, 216, 219, 222,
+ 226, 229, 232, 235, 239, 242, 245, 249, 252, 255, 259,
+ 262, 265, 269, 272, 275, 279, 282, 285, 289, 292, 295,
+ 299, 302, 305, 309, 312, 315, 319, 322, 325, 328, 332,
+ 335, 338, 342, 345, 348, 352, 355, 358, 362, 365, 368,
+ 372, 375, 378, 382, 385, 388, 392, 395, 398, 402, 405,
+ 408, 412, 415, 418, 422, 425, 428, 431, 435, 438, 441,
+ 445, 448, 451, 455, 458, 461, 465, 468, 471, 475, 478,
+ 481, 485, 488, 491, 495, 498, 501, 505, 508, 511, 515,
+ 518, 521, 524, 528, 531, 534, 538, 541, 544, 548, 551,
+ 554, 558, 561, 564, 568, 571, 574, 578, 581, 584, 588,
+ 591, 594, 598, 601, 604, 608, 611, 614, 617, 621, 624,
+ 627, 631, 634, 637, 641, 644, 647, 651, 654, 657, 661,
+ 664, 667, 671, 674, 677, 681, 684, 687, 691, 694, 697,
+ 701, 704, 707, 711, 714, 717, 720, 724, 727, 730, 734,
+ 737, 740, 744, 747, 750, 754, 757, 760, 764, 767, 770,
+ 774, 777, 780, 784, 787, 790, 794, 797, 800, 804, 807,
+ 810, 813, 817, 820, 823, 827, 830, 833, 837, 840, 843,
+ 847, 850, 853, 857, 860, 863, 867, 870, 873, 877, 880,
+ 883, 887, 890, 893, 897, 900, 903, 907, 910, 913, 916,
+ 920, 923, 926, 930, 933, 936, 940, 943, 946, 950, 953,
+ 956, 960,
+};
+
+} // namespace
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/strings/charconv.h b/third_party/abseil/src/absl/strings/charconv.h
new file mode 100644
index 0000000..e04be32
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/charconv.h
@@ -0,0 +1,119 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_STRINGS_CHARCONV_H_
+#define ABSL_STRINGS_CHARCONV_H_
+
+#include <system_error> // NOLINT(build/c++11)
+
+#include "absl/base/config.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+// Workalike compatibilty version of std::chars_format from C++17.
+//
+// This is an bitfield enumerator which can be passed to absl::from_chars to
+// configure the string-to-float conversion.
+enum class chars_format {
+ scientific = 1,
+ fixed = 2,
+ hex = 4,
+ general = fixed | scientific,
+};
+
+// The return result of a string-to-number conversion.
+//
+// `ec` will be set to `invalid_argument` if a well-formed number was not found
+// at the start of the input range, `result_out_of_range` if a well-formed
+// number was found, but it was out of the representable range of the requested
+// type, or to std::errc() otherwise.
+//
+// If a well-formed number was found, `ptr` is set to one past the sequence of
+// characters that were successfully parsed. If none was found, `ptr` is set
+// to the `first` argument to from_chars.
+struct from_chars_result {
+ const char* ptr;
+ std::errc ec;
+};
+
+// Workalike compatibilty version of std::from_chars from C++17. Currently
+// this only supports the `double` and `float` types.
+//
+// This interface incorporates the proposed resolutions for library issues
+// DR 3080 and DR 3081. If these are adopted with different wording,
+// Abseil's behavior will change to match the standard. (The behavior most
+// likely to change is for DR 3081, which says what `value` will be set to in
+// the case of overflow and underflow. Code that wants to avoid possible
+// breaking changes in this area should not depend on `value` when the returned
+// from_chars_result indicates a range error.)
+//
+// Searches the range [first, last) for the longest matching pattern beginning
+// at `first` that represents a floating point number. If one is found, store
+// the result in `value`.
+//
+// The matching pattern format is almost the same as that of strtod(), except
+// that C locale is not respected, and an initial '+' character in the input
+// range will never be matched.
+//
+// If `fmt` is set, it must be one of the enumerator values of the chars_format.
+// (This is despite the fact that chars_format is a bitmask type.) If set to
+// `scientific`, a matching number must contain an exponent. If set to `fixed`,
+// then an exponent will never match. (For example, the string "1e5" will be
+// parsed as "1".) If set to `hex`, then a hexadecimal float is parsed in the
+// format that strtod() accepts, except that a "0x" prefix is NOT matched.
+// (In particular, in `hex` mode, the input "0xff" results in the largest
+// matching pattern "0".)
+absl::from_chars_result from_chars(const char* first, const char* last,
+ double& value, // NOLINT
+ chars_format fmt = chars_format::general);
+
+absl::from_chars_result from_chars(const char* first, const char* last,
+ float& value, // NOLINT
+ chars_format fmt = chars_format::general);
+
+// std::chars_format is specified as a bitmask type, which means the following
+// operations must be provided:
+inline constexpr chars_format operator&(chars_format lhs, chars_format rhs) {
+ return static_cast<chars_format>(static_cast<int>(lhs) &
+ static_cast<int>(rhs));
+}
+inline constexpr chars_format operator|(chars_format lhs, chars_format rhs) {
+ return static_cast<chars_format>(static_cast<int>(lhs) |
+ static_cast<int>(rhs));
+}
+inline constexpr chars_format operator^(chars_format lhs, chars_format rhs) {
+ return static_cast<chars_format>(static_cast<int>(lhs) ^
+ static_cast<int>(rhs));
+}
+inline constexpr chars_format operator~(chars_format arg) {
+ return static_cast<chars_format>(~static_cast<int>(arg));
+}
+inline chars_format& operator&=(chars_format& lhs, chars_format rhs) {
+ lhs = lhs & rhs;
+ return lhs;
+}
+inline chars_format& operator|=(chars_format& lhs, chars_format rhs) {
+ lhs = lhs | rhs;
+ return lhs;
+}
+inline chars_format& operator^=(chars_format& lhs, chars_format rhs) {
+ lhs = lhs ^ rhs;
+ return lhs;
+}
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_STRINGS_CHARCONV_H_
diff --git a/third_party/abseil/src/absl/strings/charconv_benchmark.cc b/third_party/abseil/src/absl/strings/charconv_benchmark.cc
new file mode 100644
index 0000000..e8c7371
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/charconv_benchmark.cc
@@ -0,0 +1,204 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/strings/charconv.h"
+
+#include <cstdlib>
+#include <cstring>
+#include <string>
+
+#include "benchmark/benchmark.h"
+
+namespace {
+
+void BM_Strtod_Pi(benchmark::State& state) {
+ const char* pi = "3.14159";
+ for (auto s : state) {
+ benchmark::DoNotOptimize(pi);
+ benchmark::DoNotOptimize(strtod(pi, nullptr));
+ }
+}
+BENCHMARK(BM_Strtod_Pi);
+
+void BM_Absl_Pi(benchmark::State& state) {
+ const char* pi = "3.14159";
+ const char* pi_end = pi + strlen(pi);
+ for (auto s : state) {
+ benchmark::DoNotOptimize(pi);
+ double v;
+ absl::from_chars(pi, pi_end, v);
+ benchmark::DoNotOptimize(v);
+ }
+}
+BENCHMARK(BM_Absl_Pi);
+
+void BM_Strtod_Pi_float(benchmark::State& state) {
+ const char* pi = "3.14159";
+ for (auto s : state) {
+ benchmark::DoNotOptimize(pi);
+ benchmark::DoNotOptimize(strtof(pi, nullptr));
+ }
+}
+BENCHMARK(BM_Strtod_Pi_float);
+
+void BM_Absl_Pi_float(benchmark::State& state) {
+ const char* pi = "3.14159";
+ const char* pi_end = pi + strlen(pi);
+ for (auto s : state) {
+ benchmark::DoNotOptimize(pi);
+ float v;
+ absl::from_chars(pi, pi_end, v);
+ benchmark::DoNotOptimize(v);
+ }
+}
+BENCHMARK(BM_Absl_Pi_float);
+
+void BM_Strtod_HardLarge(benchmark::State& state) {
+ const char* num = "272104041512242479.e200";
+ for (auto s : state) {
+ benchmark::DoNotOptimize(num);
+ benchmark::DoNotOptimize(strtod(num, nullptr));
+ }
+}
+BENCHMARK(BM_Strtod_HardLarge);
+
+void BM_Absl_HardLarge(benchmark::State& state) {
+ const char* numstr = "272104041512242479.e200";
+ const char* numstr_end = numstr + strlen(numstr);
+ for (auto s : state) {
+ benchmark::DoNotOptimize(numstr);
+ double v;
+ absl::from_chars(numstr, numstr_end, v);
+ benchmark::DoNotOptimize(v);
+ }
+}
+BENCHMARK(BM_Absl_HardLarge);
+
+void BM_Strtod_HardSmall(benchmark::State& state) {
+ const char* num = "94080055902682397.e-242";
+ for (auto s : state) {
+ benchmark::DoNotOptimize(num);
+ benchmark::DoNotOptimize(strtod(num, nullptr));
+ }
+}
+BENCHMARK(BM_Strtod_HardSmall);
+
+void BM_Absl_HardSmall(benchmark::State& state) {
+ const char* numstr = "94080055902682397.e-242";
+ const char* numstr_end = numstr + strlen(numstr);
+ for (auto s : state) {
+ benchmark::DoNotOptimize(numstr);
+ double v;
+ absl::from_chars(numstr, numstr_end, v);
+ benchmark::DoNotOptimize(v);
+ }
+}
+BENCHMARK(BM_Absl_HardSmall);
+
+void BM_Strtod_HugeMantissa(benchmark::State& state) {
+ std::string huge(200, '3');
+ const char* num = huge.c_str();
+ for (auto s : state) {
+ benchmark::DoNotOptimize(num);
+ benchmark::DoNotOptimize(strtod(num, nullptr));
+ }
+}
+BENCHMARK(BM_Strtod_HugeMantissa);
+
+void BM_Absl_HugeMantissa(benchmark::State& state) {
+ std::string huge(200, '3');
+ const char* num = huge.c_str();
+ const char* num_end = num + 200;
+ for (auto s : state) {
+ benchmark::DoNotOptimize(num);
+ double v;
+ absl::from_chars(num, num_end, v);
+ benchmark::DoNotOptimize(v);
+ }
+}
+BENCHMARK(BM_Absl_HugeMantissa);
+
+std::string MakeHardCase(int length) {
+ // The number 1.1521...e-297 is exactly halfway between 12345 * 2**-1000 and
+ // the next larger representable number. The digits of this number are in
+ // the string below.
+ const std::string digits =
+ "1."
+ "152113937042223790993097181572444900347587985074226836242307364987727724"
+ "831384300183638649152607195040591791364113930628852279348613864894524591"
+ "272746490313676832900762939595690019745859128071117417798540258114233761"
+ "012939937017879509401007964861774960297319002612457273148497158989073482"
+ "171377406078223015359818300988676687994537274548940612510414856761641652"
+ "513434981938564294004070500716200446656421722229202383105446378511678258"
+ "370570631774499359748259931676320916632111681001853983492795053244971606"
+ "922718923011680846577744433974087653954904214152517799883551075537146316"
+ "168973685866425605046988661997658648354773076621610279716804960009043764"
+ "038392994055171112475093876476783502487512538082706095923790634572014823"
+ "78877699375152587890625" +
+ std::string(5000, '0');
+ // generate the hard cases on either side for the given length.
+ // Lengths between 3 and 1000 are reasonable.
+ return digits.substr(0, length) + "1e-297";
+}
+
+void BM_Strtod_Big_And_Difficult(benchmark::State& state) {
+ std::string testcase = MakeHardCase(state.range(0));
+ const char* begin = testcase.c_str();
+ for (auto s : state) {
+ benchmark::DoNotOptimize(begin);
+ benchmark::DoNotOptimize(strtod(begin, nullptr));
+ }
+}
+BENCHMARK(BM_Strtod_Big_And_Difficult)->Range(3, 5000);
+
+void BM_Absl_Big_And_Difficult(benchmark::State& state) {
+ std::string testcase = MakeHardCase(state.range(0));
+ const char* begin = testcase.c_str();
+ const char* end = begin + testcase.size();
+ for (auto s : state) {
+ benchmark::DoNotOptimize(begin);
+ double v;
+ absl::from_chars(begin, end, v);
+ benchmark::DoNotOptimize(v);
+ }
+}
+BENCHMARK(BM_Absl_Big_And_Difficult)->Range(3, 5000);
+
+} // namespace
+
+// ------------------------------------------------------------------------
+// Benchmark Time CPU Iterations
+// ------------------------------------------------------------------------
+// BM_Strtod_Pi 96 ns 96 ns 6337454
+// BM_Absl_Pi 35 ns 35 ns 20031996
+// BM_Strtod_Pi_float 91 ns 91 ns 7745851
+// BM_Absl_Pi_float 35 ns 35 ns 20430298
+// BM_Strtod_HardLarge 133 ns 133 ns 5288341
+// BM_Absl_HardLarge 181 ns 181 ns 3855615
+// BM_Strtod_HardSmall 279 ns 279 ns 2517243
+// BM_Absl_HardSmall 287 ns 287 ns 2458744
+// BM_Strtod_HugeMantissa 433 ns 433 ns 1604293
+// BM_Absl_HugeMantissa 160 ns 160 ns 4403671
+// BM_Strtod_Big_And_Difficult/3 236 ns 236 ns 2942496
+// BM_Strtod_Big_And_Difficult/8 232 ns 232 ns 2983796
+// BM_Strtod_Big_And_Difficult/64 437 ns 437 ns 1591951
+// BM_Strtod_Big_And_Difficult/512 1738 ns 1738 ns 402519
+// BM_Strtod_Big_And_Difficult/4096 3943 ns 3943 ns 176128
+// BM_Strtod_Big_And_Difficult/5000 4397 ns 4397 ns 157878
+// BM_Absl_Big_And_Difficult/3 39 ns 39 ns 17799583
+// BM_Absl_Big_And_Difficult/8 43 ns 43 ns 16096859
+// BM_Absl_Big_And_Difficult/64 550 ns 550 ns 1259717
+// BM_Absl_Big_And_Difficult/512 4167 ns 4167 ns 171414
+// BM_Absl_Big_And_Difficult/4096 9160 ns 9159 ns 76297
+// BM_Absl_Big_And_Difficult/5000 9738 ns 9738 ns 70140
diff --git a/third_party/abseil/src/absl/strings/charconv_test.cc b/third_party/abseil/src/absl/strings/charconv_test.cc
new file mode 100644
index 0000000..9090e9c
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/charconv_test.cc
@@ -0,0 +1,780 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/strings/charconv.h"
+
+#include <cstdlib>
+#include <string>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/strings/internal/pow10_helper.h"
+#include "absl/strings/str_cat.h"
+#include "absl/strings/str_format.h"
+
+#ifdef _MSC_FULL_VER
+#define ABSL_COMPILER_DOES_EXACT_ROUNDING 0
+#define ABSL_STRTOD_HANDLES_NAN_CORRECTLY 0
+#else
+#define ABSL_COMPILER_DOES_EXACT_ROUNDING 1
+#define ABSL_STRTOD_HANDLES_NAN_CORRECTLY 1
+#endif
+
+namespace {
+
+using absl::strings_internal::Pow10;
+
+#if ABSL_COMPILER_DOES_EXACT_ROUNDING
+
+// Tests that the given string is accepted by absl::from_chars, and that it
+// converts exactly equal to the given number.
+void TestDoubleParse(absl::string_view str, double expected_number) {
+ SCOPED_TRACE(str);
+ double actual_number = 0.0;
+ absl::from_chars_result result =
+ absl::from_chars(str.data(), str.data() + str.length(), actual_number);
+ EXPECT_EQ(result.ec, std::errc());
+ EXPECT_EQ(result.ptr, str.data() + str.length());
+ EXPECT_EQ(actual_number, expected_number);
+}
+
+void TestFloatParse(absl::string_view str, float expected_number) {
+ SCOPED_TRACE(str);
+ float actual_number = 0.0;
+ absl::from_chars_result result =
+ absl::from_chars(str.data(), str.data() + str.length(), actual_number);
+ EXPECT_EQ(result.ec, std::errc());
+ EXPECT_EQ(result.ptr, str.data() + str.length());
+ EXPECT_EQ(actual_number, expected_number);
+}
+
+// Tests that the given double or single precision floating point literal is
+// parsed correctly by absl::from_chars.
+//
+// These convenience macros assume that the C++ compiler being used also does
+// fully correct decimal-to-binary conversions.
+#define FROM_CHARS_TEST_DOUBLE(number) \
+ { \
+ TestDoubleParse(#number, number); \
+ TestDoubleParse("-" #number, -number); \
+ }
+
+#define FROM_CHARS_TEST_FLOAT(number) \
+ { \
+ TestFloatParse(#number, number##f); \
+ TestFloatParse("-" #number, -number##f); \
+ }
+
+TEST(FromChars, NearRoundingCases) {
+ // Cases from "A Program for Testing IEEE Decimal-Binary Conversion"
+ // by Vern Paxson.
+
+ // Forms that should round towards zero. (These are the hardest cases for
+ // each decimal mantissa size.)
+ FROM_CHARS_TEST_DOUBLE(5.e125);
+ FROM_CHARS_TEST_DOUBLE(69.e267);
+ FROM_CHARS_TEST_DOUBLE(999.e-026);
+ FROM_CHARS_TEST_DOUBLE(7861.e-034);
+ FROM_CHARS_TEST_DOUBLE(75569.e-254);
+ FROM_CHARS_TEST_DOUBLE(928609.e-261);
+ FROM_CHARS_TEST_DOUBLE(9210917.e080);
+ FROM_CHARS_TEST_DOUBLE(84863171.e114);
+ FROM_CHARS_TEST_DOUBLE(653777767.e273);
+ FROM_CHARS_TEST_DOUBLE(5232604057.e-298);
+ FROM_CHARS_TEST_DOUBLE(27235667517.e-109);
+ FROM_CHARS_TEST_DOUBLE(653532977297.e-123);
+ FROM_CHARS_TEST_DOUBLE(3142213164987.e-294);
+ FROM_CHARS_TEST_DOUBLE(46202199371337.e-072);
+ FROM_CHARS_TEST_DOUBLE(231010996856685.e-073);
+ FROM_CHARS_TEST_DOUBLE(9324754620109615.e212);
+ FROM_CHARS_TEST_DOUBLE(78459735791271921.e049);
+ FROM_CHARS_TEST_DOUBLE(272104041512242479.e200);
+ FROM_CHARS_TEST_DOUBLE(6802601037806061975.e198);
+ FROM_CHARS_TEST_DOUBLE(20505426358836677347.e-221);
+ FROM_CHARS_TEST_DOUBLE(836168422905420598437.e-234);
+ FROM_CHARS_TEST_DOUBLE(4891559871276714924261.e222);
+ FROM_CHARS_TEST_FLOAT(5.e-20);
+ FROM_CHARS_TEST_FLOAT(67.e14);
+ FROM_CHARS_TEST_FLOAT(985.e15);
+ FROM_CHARS_TEST_FLOAT(7693.e-42);
+ FROM_CHARS_TEST_FLOAT(55895.e-16);
+ FROM_CHARS_TEST_FLOAT(996622.e-44);
+ FROM_CHARS_TEST_FLOAT(7038531.e-32);
+ FROM_CHARS_TEST_FLOAT(60419369.e-46);
+ FROM_CHARS_TEST_FLOAT(702990899.e-20);
+ FROM_CHARS_TEST_FLOAT(6930161142.e-48);
+ FROM_CHARS_TEST_FLOAT(25933168707.e-13);
+ FROM_CHARS_TEST_FLOAT(596428896559.e20);
+
+ // Similarly, forms that should round away from zero.
+ FROM_CHARS_TEST_DOUBLE(9.e-265);
+ FROM_CHARS_TEST_DOUBLE(85.e-037);
+ FROM_CHARS_TEST_DOUBLE(623.e100);
+ FROM_CHARS_TEST_DOUBLE(3571.e263);
+ FROM_CHARS_TEST_DOUBLE(81661.e153);
+ FROM_CHARS_TEST_DOUBLE(920657.e-023);
+ FROM_CHARS_TEST_DOUBLE(4603285.e-024);
+ FROM_CHARS_TEST_DOUBLE(87575437.e-309);
+ FROM_CHARS_TEST_DOUBLE(245540327.e122);
+ FROM_CHARS_TEST_DOUBLE(6138508175.e120);
+ FROM_CHARS_TEST_DOUBLE(83356057653.e193);
+ FROM_CHARS_TEST_DOUBLE(619534293513.e124);
+ FROM_CHARS_TEST_DOUBLE(2335141086879.e218);
+ FROM_CHARS_TEST_DOUBLE(36167929443327.e-159);
+ FROM_CHARS_TEST_DOUBLE(609610927149051.e-255);
+ FROM_CHARS_TEST_DOUBLE(3743626360493413.e-165);
+ FROM_CHARS_TEST_DOUBLE(94080055902682397.e-242);
+ FROM_CHARS_TEST_DOUBLE(899810892172646163.e283);
+ FROM_CHARS_TEST_DOUBLE(7120190517612959703.e120);
+ FROM_CHARS_TEST_DOUBLE(25188282901709339043.e-252);
+ FROM_CHARS_TEST_DOUBLE(308984926168550152811.e-052);
+ FROM_CHARS_TEST_DOUBLE(6372891218502368041059.e064);
+ FROM_CHARS_TEST_FLOAT(3.e-23);
+ FROM_CHARS_TEST_FLOAT(57.e18);
+ FROM_CHARS_TEST_FLOAT(789.e-35);
+ FROM_CHARS_TEST_FLOAT(2539.e-18);
+ FROM_CHARS_TEST_FLOAT(76173.e28);
+ FROM_CHARS_TEST_FLOAT(887745.e-11);
+ FROM_CHARS_TEST_FLOAT(5382571.e-37);
+ FROM_CHARS_TEST_FLOAT(82381273.e-35);
+ FROM_CHARS_TEST_FLOAT(750486563.e-38);
+ FROM_CHARS_TEST_FLOAT(3752432815.e-39);
+ FROM_CHARS_TEST_FLOAT(75224575729.e-45);
+ FROM_CHARS_TEST_FLOAT(459926601011.e15);
+}
+
+#undef FROM_CHARS_TEST_DOUBLE
+#undef FROM_CHARS_TEST_FLOAT
+#endif
+
+float ToFloat(absl::string_view s) {
+ float f;
+ absl::from_chars(s.data(), s.data() + s.size(), f);
+ return f;
+}
+
+double ToDouble(absl::string_view s) {
+ double d;
+ absl::from_chars(s.data(), s.data() + s.size(), d);
+ return d;
+}
+
+// A duplication of the test cases in "NearRoundingCases" above, but with
+// expected values expressed with integers, using ldexp/ldexpf. These test
+// cases will work even on compilers that do not accurately round floating point
+// literals.
+TEST(FromChars, NearRoundingCasesExplicit) {
+ EXPECT_EQ(ToDouble("5.e125"), ldexp(6653062250012735, 365));
+ EXPECT_EQ(ToDouble("69.e267"), ldexp(4705683757438170, 841));
+ EXPECT_EQ(ToDouble("999.e-026"), ldexp(6798841691080350, -129));
+ EXPECT_EQ(ToDouble("7861.e-034"), ldexp(8975675289889240, -153));
+ EXPECT_EQ(ToDouble("75569.e-254"), ldexp(6091718967192243, -880));
+ EXPECT_EQ(ToDouble("928609.e-261"), ldexp(7849264900213743, -900));
+ EXPECT_EQ(ToDouble("9210917.e080"), ldexp(8341110837370930, 236));
+ EXPECT_EQ(ToDouble("84863171.e114"), ldexp(4625202867375927, 353));
+ EXPECT_EQ(ToDouble("653777767.e273"), ldexp(5068902999763073, 884));
+ EXPECT_EQ(ToDouble("5232604057.e-298"), ldexp(5741343011915040, -1010));
+ EXPECT_EQ(ToDouble("27235667517.e-109"), ldexp(6707124626673586, -380));
+ EXPECT_EQ(ToDouble("653532977297.e-123"), ldexp(7078246407265384, -422));
+ EXPECT_EQ(ToDouble("3142213164987.e-294"), ldexp(8219991337640559, -988));
+ EXPECT_EQ(ToDouble("46202199371337.e-072"), ldexp(5224462102115359, -246));
+ EXPECT_EQ(ToDouble("231010996856685.e-073"), ldexp(5224462102115359, -247));
+ EXPECT_EQ(ToDouble("9324754620109615.e212"), ldexp(5539753864394442, 705));
+ EXPECT_EQ(ToDouble("78459735791271921.e049"), ldexp(8388176519442766, 166));
+ EXPECT_EQ(ToDouble("272104041512242479.e200"), ldexp(5554409530847367, 670));
+ EXPECT_EQ(ToDouble("6802601037806061975.e198"), ldexp(5554409530847367, 668));
+ EXPECT_EQ(ToDouble("20505426358836677347.e-221"),
+ ldexp(4524032052079546, -722));
+ EXPECT_EQ(ToDouble("836168422905420598437.e-234"),
+ ldexp(5070963299887562, -760));
+ EXPECT_EQ(ToDouble("4891559871276714924261.e222"),
+ ldexp(6452687840519111, 757));
+ EXPECT_EQ(ToFloat("5.e-20"), ldexpf(15474250, -88));
+ EXPECT_EQ(ToFloat("67.e14"), ldexpf(12479722, 29));
+ EXPECT_EQ(ToFloat("985.e15"), ldexpf(14333636, 36));
+ EXPECT_EQ(ToFloat("7693.e-42"), ldexpf(10979816, -150));
+ EXPECT_EQ(ToFloat("55895.e-16"), ldexpf(12888509, -61));
+ EXPECT_EQ(ToFloat("996622.e-44"), ldexpf(14224264, -150));
+ EXPECT_EQ(ToFloat("7038531.e-32"), ldexpf(11420669, -107));
+ EXPECT_EQ(ToFloat("60419369.e-46"), ldexpf(8623340, -150));
+ EXPECT_EQ(ToFloat("702990899.e-20"), ldexpf(16209866, -61));
+ EXPECT_EQ(ToFloat("6930161142.e-48"), ldexpf(9891056, -150));
+ EXPECT_EQ(ToFloat("25933168707.e-13"), ldexpf(11138211, -32));
+ EXPECT_EQ(ToFloat("596428896559.e20"), ldexpf(12333860, 82));
+
+
+ EXPECT_EQ(ToDouble("9.e-265"), ldexp(8168427841980010, -930));
+ EXPECT_EQ(ToDouble("85.e-037"), ldexp(6360455125664090, -169));
+ EXPECT_EQ(ToDouble("623.e100"), ldexp(6263531988747231, 289));
+ EXPECT_EQ(ToDouble("3571.e263"), ldexp(6234526311072170, 833));
+ EXPECT_EQ(ToDouble("81661.e153"), ldexp(6696636728760206, 472));
+ EXPECT_EQ(ToDouble("920657.e-023"), ldexp(5975405561110124, -109));
+ EXPECT_EQ(ToDouble("4603285.e-024"), ldexp(5975405561110124, -110));
+ EXPECT_EQ(ToDouble("87575437.e-309"), ldexp(8452160731874668, -1053));
+ EXPECT_EQ(ToDouble("245540327.e122"), ldexp(4985336549131723, 381));
+ EXPECT_EQ(ToDouble("6138508175.e120"), ldexp(4985336549131723, 379));
+ EXPECT_EQ(ToDouble("83356057653.e193"), ldexp(5986732817132056, 625));
+ EXPECT_EQ(ToDouble("619534293513.e124"), ldexp(4798406992060657, 399));
+ EXPECT_EQ(ToDouble("2335141086879.e218"), ldexp(5419088166961646, 713));
+ EXPECT_EQ(ToDouble("36167929443327.e-159"), ldexp(8135819834632444, -536));
+ EXPECT_EQ(ToDouble("609610927149051.e-255"), ldexp(4576664294594737, -850));
+ EXPECT_EQ(ToDouble("3743626360493413.e-165"), ldexp(6898586531774201, -549));
+ EXPECT_EQ(ToDouble("94080055902682397.e-242"), ldexp(6273271706052298, -800));
+ EXPECT_EQ(ToDouble("899810892172646163.e283"), ldexp(7563892574477827, 947));
+ EXPECT_EQ(ToDouble("7120190517612959703.e120"), ldexp(5385467232557565, 409));
+ EXPECT_EQ(ToDouble("25188282901709339043.e-252"),
+ ldexp(5635662608542340, -825));
+ EXPECT_EQ(ToDouble("308984926168550152811.e-052"),
+ ldexp(5644774693823803, -157));
+ EXPECT_EQ(ToDouble("6372891218502368041059.e064"),
+ ldexp(4616868614322430, 233));
+
+ EXPECT_EQ(ToFloat("3.e-23"), ldexpf(9507380, -98));
+ EXPECT_EQ(ToFloat("57.e18"), ldexpf(12960300, 42));
+ EXPECT_EQ(ToFloat("789.e-35"), ldexpf(10739312, -130));
+ EXPECT_EQ(ToFloat("2539.e-18"), ldexpf(11990089, -72));
+ EXPECT_EQ(ToFloat("76173.e28"), ldexpf(9845130, 86));
+ EXPECT_EQ(ToFloat("887745.e-11"), ldexpf(9760860, -40));
+ EXPECT_EQ(ToFloat("5382571.e-37"), ldexpf(11447463, -124));
+ EXPECT_EQ(ToFloat("82381273.e-35"), ldexpf(8554961, -113));
+ EXPECT_EQ(ToFloat("750486563.e-38"), ldexpf(9975678, -120));
+ EXPECT_EQ(ToFloat("3752432815.e-39"), ldexpf(9975678, -121));
+ EXPECT_EQ(ToFloat("75224575729.e-45"), ldexpf(13105970, -137));
+ EXPECT_EQ(ToFloat("459926601011.e15"), ldexpf(12466336, 65));
+}
+
+// Common test logic for converting a string which lies exactly halfway between
+// two target floats.
+//
+// mantissa and exponent represent the precise value between two floating point
+// numbers, `expected_low` and `expected_high`. The floating point
+// representation to parse in `StrCat(mantissa, "e", exponent)`.
+//
+// This function checks that an input just slightly less than the exact value
+// is rounded down to `expected_low`, and an input just slightly greater than
+// the exact value is rounded up to `expected_high`.
+//
+// The exact value should round to `expected_half`, which must be either
+// `expected_low` or `expected_high`.
+template <typename FloatType>
+void TestHalfwayValue(const std::string& mantissa, int exponent,
+ FloatType expected_low, FloatType expected_high,
+ FloatType expected_half) {
+ std::string low_rep = mantissa;
+ low_rep[low_rep.size() - 1] -= 1;
+ absl::StrAppend(&low_rep, std::string(1000, '9'), "e", exponent);
+
+ FloatType actual_low = 0;
+ absl::from_chars(low_rep.data(), low_rep.data() + low_rep.size(), actual_low);
+ EXPECT_EQ(expected_low, actual_low);
+
+ std::string high_rep =
+ absl::StrCat(mantissa, std::string(1000, '0'), "1e", exponent);
+ FloatType actual_high = 0;
+ absl::from_chars(high_rep.data(), high_rep.data() + high_rep.size(),
+ actual_high);
+ EXPECT_EQ(expected_high, actual_high);
+
+ std::string halfway_rep = absl::StrCat(mantissa, "e", exponent);
+ FloatType actual_half = 0;
+ absl::from_chars(halfway_rep.data(), halfway_rep.data() + halfway_rep.size(),
+ actual_half);
+ EXPECT_EQ(expected_half, actual_half);
+}
+
+TEST(FromChars, DoubleRounding) {
+ const double zero = 0.0;
+ const double first_subnormal = nextafter(zero, 1.0);
+ const double second_subnormal = nextafter(first_subnormal, 1.0);
+
+ const double first_normal = DBL_MIN;
+ const double last_subnormal = nextafter(first_normal, 0.0);
+ const double second_normal = nextafter(first_normal, 1.0);
+
+ const double last_normal = DBL_MAX;
+ const double penultimate_normal = nextafter(last_normal, 0.0);
+
+ // Various test cases for numbers between two representable floats. Each
+ // call to TestHalfwayValue tests a number just below and just above the
+ // halfway point, as well as the number exactly between them.
+
+ // Test between zero and first_subnormal. Round-to-even tie rounds down.
+ TestHalfwayValue(
+ "2."
+ "470328229206232720882843964341106861825299013071623822127928412503377536"
+ "351043759326499181808179961898982823477228588654633283551779698981993873"
+ "980053909390631503565951557022639229085839244910518443593180284993653615"
+ "250031937045767824921936562366986365848075700158576926990370631192827955"
+ "855133292783433840935197801553124659726357957462276646527282722005637400"
+ "648549997709659947045402082816622623785739345073633900796776193057750674"
+ "017632467360096895134053553745851666113422376667860416215968046191446729"
+ "184030053005753084904876539171138659164623952491262365388187963623937328"
+ "042389101867234849766823508986338858792562830275599565752445550725518931"
+ "369083625477918694866799496832404970582102851318545139621383772282614543"
+ "7693412532098591327667236328125",
+ -324, zero, first_subnormal, zero);
+
+ // first_subnormal and second_subnormal. Round-to-even tie rounds up.
+ TestHalfwayValue(
+ "7."
+ "410984687618698162648531893023320585475897039214871466383785237510132609"
+ "053131277979497545424539885696948470431685765963899850655339096945981621"
+ "940161728171894510697854671067917687257517734731555330779540854980960845"
+ "750095811137303474765809687100959097544227100475730780971111893578483867"
+ "565399878350301522805593404659373979179073872386829939581848166016912201"
+ "945649993128979841136206248449867871357218035220901702390328579173252022"
+ "052897402080290685402160661237554998340267130003581248647904138574340187"
+ "552090159017259254714629617513415977493871857473787096164563890871811984"
+ "127167305601704549300470526959016576377688490826798697257336652176556794"
+ "107250876433756084600398490497214911746308553955635418864151316847843631"
+ "3080237596295773983001708984375",
+ -324, first_subnormal, second_subnormal, second_subnormal);
+
+ // last_subnormal and first_normal. Round-to-even tie rounds up.
+ TestHalfwayValue(
+ "2."
+ "225073858507201136057409796709131975934819546351645648023426109724822222"
+ "021076945516529523908135087914149158913039621106870086438694594645527657"
+ "207407820621743379988141063267329253552286881372149012981122451451889849"
+ "057222307285255133155755015914397476397983411801999323962548289017107081"
+ "850690630666655994938275772572015763062690663332647565300009245888316433"
+ "037779791869612049497390377829704905051080609940730262937128958950003583"
+ "799967207254304360284078895771796150945516748243471030702609144621572289"
+ "880258182545180325707018860872113128079512233426288368622321503775666622"
+ "503982534335974568884423900265498198385487948292206894721689831099698365"
+ "846814022854243330660339850886445804001034933970427567186443383770486037"
+ "86162277173854562306587467901408672332763671875",
+ -308, last_subnormal, first_normal, first_normal);
+
+ // first_normal and second_normal. Round-to-even tie rounds down.
+ TestHalfwayValue(
+ "2."
+ "225073858507201630123055637955676152503612414573018013083228724049586647"
+ "606759446192036794116886953213985520549032000903434781884412325572184367"
+ "563347617020518175998922941393629966742598285899994830148971433555578567"
+ "693279306015978183162142425067962460785295885199272493577688320732492479"
+ "924816869232247165964934329258783950102250973957579510571600738343645738"
+ "494324192997092179207389919761694314131497173265255020084997973676783743"
+ "155205818804439163810572367791175177756227497413804253387084478193655533"
+ "073867420834526162513029462022730109054820067654020201547112002028139700"
+ "141575259123440177362244273712468151750189745559978653234255886219611516"
+ "335924167958029604477064946470184777360934300451421683607013647479513962"
+ "13837722826145437693412532098591327667236328125",
+ -308, first_normal, second_normal, first_normal);
+
+ // penultimate_normal and last_normal. Round-to-even rounds down.
+ TestHalfwayValue(
+ "1."
+ "797693134862315608353258760581052985162070023416521662616611746258695532"
+ "672923265745300992879465492467506314903358770175220871059269879629062776"
+ "047355692132901909191523941804762171253349609463563872612866401980290377"
+ "995141836029815117562837277714038305214839639239356331336428021390916694"
+ "57927874464075218944",
+ 308, penultimate_normal, last_normal, penultimate_normal);
+}
+
+// Same test cases as DoubleRounding, now with new and improved Much Smaller
+// Precision!
+TEST(FromChars, FloatRounding) {
+ const float zero = 0.0;
+ const float first_subnormal = nextafterf(zero, 1.0);
+ const float second_subnormal = nextafterf(first_subnormal, 1.0);
+
+ const float first_normal = FLT_MIN;
+ const float last_subnormal = nextafterf(first_normal, 0.0);
+ const float second_normal = nextafterf(first_normal, 1.0);
+
+ const float last_normal = FLT_MAX;
+ const float penultimate_normal = nextafterf(last_normal, 0.0);
+
+ // Test between zero and first_subnormal. Round-to-even tie rounds down.
+ TestHalfwayValue(
+ "7."
+ "006492321624085354618647916449580656401309709382578858785341419448955413"
+ "42930300743319094181060791015625",
+ -46, zero, first_subnormal, zero);
+
+ // first_subnormal and second_subnormal. Round-to-even tie rounds up.
+ TestHalfwayValue(
+ "2."
+ "101947696487225606385594374934874196920392912814773657635602425834686624"
+ "028790902229957282543182373046875",
+ -45, first_subnormal, second_subnormal, second_subnormal);
+
+ // last_subnormal and first_normal. Round-to-even tie rounds up.
+ TestHalfwayValue(
+ "1."
+ "175494280757364291727882991035766513322858992758990427682963118425003064"
+ "9651730385585324256680905818939208984375",
+ -38, last_subnormal, first_normal, first_normal);
+
+ // first_normal and second_normal. Round-to-even tie rounds down.
+ TestHalfwayValue(
+ "1."
+ "175494420887210724209590083408724842314472120785184615334540294131831453"
+ "9442813071445925743319094181060791015625",
+ -38, first_normal, second_normal, first_normal);
+
+ // penultimate_normal and last_normal. Round-to-even rounds down.
+ TestHalfwayValue("3.40282336497324057985868971510891282432", 38,
+ penultimate_normal, last_normal, penultimate_normal);
+}
+
+TEST(FromChars, Underflow) {
+ // Check that underflow is handled correctly, according to the specification
+ // in DR 3081.
+ double d;
+ float f;
+ absl::from_chars_result result;
+
+ std::string negative_underflow = "-1e-1000";
+ const char* begin = negative_underflow.data();
+ const char* end = begin + negative_underflow.size();
+ d = 100.0;
+ result = absl::from_chars(begin, end, d);
+ EXPECT_EQ(result.ptr, end);
+ EXPECT_EQ(result.ec, std::errc::result_out_of_range);
+ EXPECT_TRUE(std::signbit(d)); // negative
+ EXPECT_GE(d, -std::numeric_limits<double>::min());
+ f = 100.0;
+ result = absl::from_chars(begin, end, f);
+ EXPECT_EQ(result.ptr, end);
+ EXPECT_EQ(result.ec, std::errc::result_out_of_range);
+ EXPECT_TRUE(std::signbit(f)); // negative
+ EXPECT_GE(f, -std::numeric_limits<float>::min());
+
+ std::string positive_underflow = "1e-1000";
+ begin = positive_underflow.data();
+ end = begin + positive_underflow.size();
+ d = -100.0;
+ result = absl::from_chars(begin, end, d);
+ EXPECT_EQ(result.ptr, end);
+ EXPECT_EQ(result.ec, std::errc::result_out_of_range);
+ EXPECT_FALSE(std::signbit(d)); // positive
+ EXPECT_LE(d, std::numeric_limits<double>::min());
+ f = -100.0;
+ result = absl::from_chars(begin, end, f);
+ EXPECT_EQ(result.ptr, end);
+ EXPECT_EQ(result.ec, std::errc::result_out_of_range);
+ EXPECT_FALSE(std::signbit(f)); // positive
+ EXPECT_LE(f, std::numeric_limits<float>::min());
+}
+
+TEST(FromChars, Overflow) {
+ // Check that overflow is handled correctly, according to the specification
+ // in DR 3081.
+ double d;
+ float f;
+ absl::from_chars_result result;
+
+ std::string negative_overflow = "-1e1000";
+ const char* begin = negative_overflow.data();
+ const char* end = begin + negative_overflow.size();
+ d = 100.0;
+ result = absl::from_chars(begin, end, d);
+ EXPECT_EQ(result.ptr, end);
+ EXPECT_EQ(result.ec, std::errc::result_out_of_range);
+ EXPECT_TRUE(std::signbit(d)); // negative
+ EXPECT_EQ(d, -std::numeric_limits<double>::max());
+ f = 100.0;
+ result = absl::from_chars(begin, end, f);
+ EXPECT_EQ(result.ptr, end);
+ EXPECT_EQ(result.ec, std::errc::result_out_of_range);
+ EXPECT_TRUE(std::signbit(f)); // negative
+ EXPECT_EQ(f, -std::numeric_limits<float>::max());
+
+ std::string positive_overflow = "1e1000";
+ begin = positive_overflow.data();
+ end = begin + positive_overflow.size();
+ d = -100.0;
+ result = absl::from_chars(begin, end, d);
+ EXPECT_EQ(result.ptr, end);
+ EXPECT_EQ(result.ec, std::errc::result_out_of_range);
+ EXPECT_FALSE(std::signbit(d)); // positive
+ EXPECT_EQ(d, std::numeric_limits<double>::max());
+ f = -100.0;
+ result = absl::from_chars(begin, end, f);
+ EXPECT_EQ(result.ptr, end);
+ EXPECT_EQ(result.ec, std::errc::result_out_of_range);
+ EXPECT_FALSE(std::signbit(f)); // positive
+ EXPECT_EQ(f, std::numeric_limits<float>::max());
+}
+
+TEST(FromChars, RegressionTestsFromFuzzer) {
+ absl::string_view src = "0x21900000p00000000099";
+ float f;
+ auto result = absl::from_chars(src.data(), src.data() + src.size(), f);
+ EXPECT_EQ(result.ec, std::errc::result_out_of_range);
+}
+
+TEST(FromChars, ReturnValuePtr) {
+ // Check that `ptr` points one past the number scanned, even if that number
+ // is not representable.
+ double d;
+ absl::from_chars_result result;
+
+ std::string normal = "3.14@#$%@#$%";
+ result = absl::from_chars(normal.data(), normal.data() + normal.size(), d);
+ EXPECT_EQ(result.ec, std::errc());
+ EXPECT_EQ(result.ptr - normal.data(), 4);
+
+ std::string overflow = "1e1000@#$%@#$%";
+ result = absl::from_chars(overflow.data(),
+ overflow.data() + overflow.size(), d);
+ EXPECT_EQ(result.ec, std::errc::result_out_of_range);
+ EXPECT_EQ(result.ptr - overflow.data(), 6);
+
+ std::string garbage = "#$%@#$%";
+ result = absl::from_chars(garbage.data(),
+ garbage.data() + garbage.size(), d);
+ EXPECT_EQ(result.ec, std::errc::invalid_argument);
+ EXPECT_EQ(result.ptr - garbage.data(), 0);
+}
+
+// Check for a wide range of inputs that strtod() and absl::from_chars() exactly
+// agree on the conversion amount.
+//
+// This test assumes the platform's strtod() uses perfect round_to_nearest
+// rounding.
+TEST(FromChars, TestVersusStrtod) {
+ for (int mantissa = 1000000; mantissa <= 9999999; mantissa += 501) {
+ for (int exponent = -300; exponent < 300; ++exponent) {
+ std::string candidate = absl::StrCat(mantissa, "e", exponent);
+ double strtod_value = strtod(candidate.c_str(), nullptr);
+ double absl_value = 0;
+ absl::from_chars(candidate.data(), candidate.data() + candidate.size(),
+ absl_value);
+ ASSERT_EQ(strtod_value, absl_value) << candidate;
+ }
+ }
+}
+
+// Check for a wide range of inputs that strtof() and absl::from_chars() exactly
+// agree on the conversion amount.
+//
+// This test assumes the platform's strtof() uses perfect round_to_nearest
+// rounding.
+TEST(FromChars, TestVersusStrtof) {
+ for (int mantissa = 1000000; mantissa <= 9999999; mantissa += 501) {
+ for (int exponent = -43; exponent < 32; ++exponent) {
+ std::string candidate = absl::StrCat(mantissa, "e", exponent);
+ float strtod_value = strtof(candidate.c_str(), nullptr);
+ float absl_value = 0;
+ absl::from_chars(candidate.data(), candidate.data() + candidate.size(),
+ absl_value);
+ ASSERT_EQ(strtod_value, absl_value) << candidate;
+ }
+ }
+}
+
+// Tests if two floating point values have identical bit layouts. (EXPECT_EQ
+// is not suitable for NaN testing, since NaNs are never equal.)
+template <typename Float>
+bool Identical(Float a, Float b) {
+ return 0 == memcmp(&a, &b, sizeof(Float));
+}
+
+// Check that NaNs are parsed correctly. The spec requires that
+// std::from_chars on "NaN(123abc)" return the same value as std::nan("123abc").
+// How such an n-char-sequence affects the generated NaN is unspecified, so we
+// just test for symmetry with std::nan and strtod here.
+//
+// (In Linux, this parses the value as a number and stuffs that number into the
+// free bits of a quiet NaN.)
+TEST(FromChars, NaNDoubles) {
+ for (std::string n_char_sequence :
+ {"", "1", "2", "3", "fff", "FFF", "200000", "400000", "4000000000000",
+ "8000000000000", "abc123", "legal_but_unexpected",
+ "99999999999999999999999", "_"}) {
+ std::string input = absl::StrCat("nan(", n_char_sequence, ")");
+ SCOPED_TRACE(input);
+ double from_chars_double;
+ absl::from_chars(input.data(), input.data() + input.size(),
+ from_chars_double);
+ double std_nan_double = std::nan(n_char_sequence.c_str());
+ EXPECT_TRUE(Identical(from_chars_double, std_nan_double));
+
+ // Also check that we match strtod()'s behavior. This test assumes that the
+ // platform has a compliant strtod().
+#if ABSL_STRTOD_HANDLES_NAN_CORRECTLY
+ double strtod_double = strtod(input.c_str(), nullptr);
+ EXPECT_TRUE(Identical(from_chars_double, strtod_double));
+#endif // ABSL_STRTOD_HANDLES_NAN_CORRECTLY
+
+ // Check that we can parse a negative NaN
+ std::string negative_input = "-" + input;
+ double negative_from_chars_double;
+ absl::from_chars(negative_input.data(),
+ negative_input.data() + negative_input.size(),
+ negative_from_chars_double);
+ EXPECT_TRUE(std::signbit(negative_from_chars_double));
+ EXPECT_FALSE(Identical(negative_from_chars_double, from_chars_double));
+ from_chars_double = std::copysign(from_chars_double, -1.0);
+ EXPECT_TRUE(Identical(negative_from_chars_double, from_chars_double));
+ }
+}
+
+TEST(FromChars, NaNFloats) {
+ for (std::string n_char_sequence :
+ {"", "1", "2", "3", "fff", "FFF", "200000", "400000", "4000000000000",
+ "8000000000000", "abc123", "legal_but_unexpected",
+ "99999999999999999999999", "_"}) {
+ std::string input = absl::StrCat("nan(", n_char_sequence, ")");
+ SCOPED_TRACE(input);
+ float from_chars_float;
+ absl::from_chars(input.data(), input.data() + input.size(),
+ from_chars_float);
+ float std_nan_float = std::nanf(n_char_sequence.c_str());
+ EXPECT_TRUE(Identical(from_chars_float, std_nan_float));
+
+ // Also check that we match strtof()'s behavior. This test assumes that the
+ // platform has a compliant strtof().
+#if ABSL_STRTOD_HANDLES_NAN_CORRECTLY
+ float strtof_float = strtof(input.c_str(), nullptr);
+ EXPECT_TRUE(Identical(from_chars_float, strtof_float));
+#endif // ABSL_STRTOD_HANDLES_NAN_CORRECTLY
+
+ // Check that we can parse a negative NaN
+ std::string negative_input = "-" + input;
+ float negative_from_chars_float;
+ absl::from_chars(negative_input.data(),
+ negative_input.data() + negative_input.size(),
+ negative_from_chars_float);
+ EXPECT_TRUE(std::signbit(negative_from_chars_float));
+ EXPECT_FALSE(Identical(negative_from_chars_float, from_chars_float));
+ from_chars_float = std::copysign(from_chars_float, -1.0);
+ EXPECT_TRUE(Identical(negative_from_chars_float, from_chars_float));
+ }
+}
+
+// Returns an integer larger than step. The values grow exponentially.
+int NextStep(int step) {
+ return step + (step >> 2) + 1;
+}
+
+// Test a conversion on a family of input strings, checking that the calculation
+// is correct for in-bounds values, and that overflow and underflow are done
+// correctly for out-of-bounds values.
+//
+// input_generator maps from an integer index to a string to test.
+// expected_generator maps from an integer index to an expected Float value.
+// from_chars conversion of input_generator(i) should result in
+// expected_generator(i).
+//
+// lower_bound and upper_bound denote the smallest and largest values for which
+// the conversion is expected to succeed.
+template <typename Float>
+void TestOverflowAndUnderflow(
+ const std::function<std::string(int)>& input_generator,
+ const std::function<Float(int)>& expected_generator, int lower_bound,
+ int upper_bound) {
+ // test legal values near lower_bound
+ int index, step;
+ for (index = lower_bound, step = 1; index < upper_bound;
+ index += step, step = NextStep(step)) {
+ std::string input = input_generator(index);
+ SCOPED_TRACE(input);
+ Float expected = expected_generator(index);
+ Float actual;
+ auto result =
+ absl::from_chars(input.data(), input.data() + input.size(), actual);
+ EXPECT_EQ(result.ec, std::errc());
+ EXPECT_EQ(expected, actual)
+ << absl::StrFormat("%a vs %a", expected, actual);
+ }
+ // test legal values near upper_bound
+ for (index = upper_bound, step = 1; index > lower_bound;
+ index -= step, step = NextStep(step)) {
+ std::string input = input_generator(index);
+ SCOPED_TRACE(input);
+ Float expected = expected_generator(index);
+ Float actual;
+ auto result =
+ absl::from_chars(input.data(), input.data() + input.size(), actual);
+ EXPECT_EQ(result.ec, std::errc());
+ EXPECT_EQ(expected, actual)
+ << absl::StrFormat("%a vs %a", expected, actual);
+ }
+ // Test underflow values below lower_bound
+ for (index = lower_bound - 1, step = 1; index > -1000000;
+ index -= step, step = NextStep(step)) {
+ std::string input = input_generator(index);
+ SCOPED_TRACE(input);
+ Float actual;
+ auto result =
+ absl::from_chars(input.data(), input.data() + input.size(), actual);
+ EXPECT_EQ(result.ec, std::errc::result_out_of_range);
+ EXPECT_LT(actual, 1.0); // check for underflow
+ }
+ // Test overflow values above upper_bound
+ for (index = upper_bound + 1, step = 1; index < 1000000;
+ index += step, step = NextStep(step)) {
+ std::string input = input_generator(index);
+ SCOPED_TRACE(input);
+ Float actual;
+ auto result =
+ absl::from_chars(input.data(), input.data() + input.size(), actual);
+ EXPECT_EQ(result.ec, std::errc::result_out_of_range);
+ EXPECT_GT(actual, 1.0); // check for overflow
+ }
+}
+
+// Check that overflow and underflow are caught correctly for hex doubles.
+//
+// The largest representable double is 0x1.fffffffffffffp+1023, and the
+// smallest representable subnormal is 0x0.0000000000001p-1022, which equals
+// 0x1p-1074. Therefore 1023 and -1074 are the limits of acceptable exponents
+// in this test.
+TEST(FromChars, HexdecimalDoubleLimits) {
+ auto input_gen = [](int index) { return absl::StrCat("0x1.0p", index); };
+ auto expected_gen = [](int index) { return std::ldexp(1.0, index); };
+ TestOverflowAndUnderflow<double>(input_gen, expected_gen, -1074, 1023);
+}
+
+// Check that overflow and underflow are caught correctly for hex floats.
+//
+// The largest representable float is 0x1.fffffep+127, and the smallest
+// representable subnormal is 0x0.000002p-126, which equals 0x1p-149.
+// Therefore 127 and -149 are the limits of acceptable exponents in this test.
+TEST(FromChars, HexdecimalFloatLimits) {
+ auto input_gen = [](int index) { return absl::StrCat("0x1.0p", index); };
+ auto expected_gen = [](int index) { return std::ldexp(1.0f, index); };
+ TestOverflowAndUnderflow<float>(input_gen, expected_gen, -149, 127);
+}
+
+// Check that overflow and underflow are caught correctly for decimal doubles.
+//
+// The largest representable double is about 1.8e308, and the smallest
+// representable subnormal is about 5e-324. '1e-324' therefore rounds away from
+// the smallest representable positive value. -323 and 308 are the limits of
+// acceptable exponents in this test.
+TEST(FromChars, DecimalDoubleLimits) {
+ auto input_gen = [](int index) { return absl::StrCat("1.0e", index); };
+ auto expected_gen = [](int index) { return Pow10(index); };
+ TestOverflowAndUnderflow<double>(input_gen, expected_gen, -323, 308);
+}
+
+// Check that overflow and underflow are caught correctly for decimal floats.
+//
+// The largest representable float is about 3.4e38, and the smallest
+// representable subnormal is about 1.45e-45. '1e-45' therefore rounds towards
+// the smallest representable positive value. -45 and 38 are the limits of
+// acceptable exponents in this test.
+TEST(FromChars, DecimalFloatLimits) {
+ auto input_gen = [](int index) { return absl::StrCat("1.0e", index); };
+ auto expected_gen = [](int index) { return Pow10(index); };
+ TestOverflowAndUnderflow<float>(input_gen, expected_gen, -45, 38);
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/strings/cord.cc b/third_party/abseil/src/absl/strings/cord.cc
new file mode 100644
index 0000000..9efd135
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/cord.cc
@@ -0,0 +1,1995 @@
+// Copyright 2020 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/strings/cord.h"
+
+#include <algorithm>
+#include <atomic>
+#include <cstddef>
+#include <cstdio>
+#include <cstdlib>
+#include <iomanip>
+#include <iostream>
+#include <limits>
+#include <ostream>
+#include <sstream>
+#include <type_traits>
+#include <unordered_set>
+#include <vector>
+
+#include "absl/base/casts.h"
+#include "absl/base/internal/raw_logging.h"
+#include "absl/base/macros.h"
+#include "absl/base/port.h"
+#include "absl/container/fixed_array.h"
+#include "absl/container/inlined_vector.h"
+#include "absl/strings/escaping.h"
+#include "absl/strings/internal/cord_internal.h"
+#include "absl/strings/internal/resize_uninitialized.h"
+#include "absl/strings/str_cat.h"
+#include "absl/strings/str_format.h"
+#include "absl/strings/str_join.h"
+#include "absl/strings/string_view.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+using ::absl::cord_internal::CordRep;
+using ::absl::cord_internal::CordRepConcat;
+using ::absl::cord_internal::CordRepExternal;
+using ::absl::cord_internal::CordRepSubstring;
+
+using ::absl::cord_internal::CONCAT;
+using ::absl::cord_internal::EXTERNAL;
+using ::absl::cord_internal::FLAT;
+using ::absl::cord_internal::SUBSTRING;
+
+namespace cord_internal {
+
+inline CordRepConcat* CordRep::concat() {
+ assert(tag == CONCAT);
+ return static_cast<CordRepConcat*>(this);
+}
+
+inline const CordRepConcat* CordRep::concat() const {
+ assert(tag == CONCAT);
+ return static_cast<const CordRepConcat*>(this);
+}
+
+inline CordRepSubstring* CordRep::substring() {
+ assert(tag == SUBSTRING);
+ return static_cast<CordRepSubstring*>(this);
+}
+
+inline const CordRepSubstring* CordRep::substring() const {
+ assert(tag == SUBSTRING);
+ return static_cast<const CordRepSubstring*>(this);
+}
+
+inline CordRepExternal* CordRep::external() {
+ assert(tag == EXTERNAL);
+ return static_cast<CordRepExternal*>(this);
+}
+
+inline const CordRepExternal* CordRep::external() const {
+ assert(tag == EXTERNAL);
+ return static_cast<const CordRepExternal*>(this);
+}
+
+} // namespace cord_internal
+
+static const size_t kFlatOverhead = offsetof(CordRep, data);
+
+// Largest and smallest flat node lengths we are willing to allocate
+// Flat allocation size is stored in tag, which currently can encode sizes up
+// to 4K, encoded as multiple of either 8 or 32 bytes.
+// If we allow for larger sizes, we need to change this to 8/64, 16/128, etc.
+static constexpr size_t kMaxFlatSize = 4096;
+static constexpr size_t kMaxFlatLength = kMaxFlatSize - kFlatOverhead;
+static constexpr size_t kMinFlatLength = 32 - kFlatOverhead;
+
+// Prefer copying blocks of at most this size, otherwise reference count.
+static const size_t kMaxBytesToCopy = 511;
+
+// Helper functions for rounded div, and rounding to exact sizes.
+static size_t DivUp(size_t n, size_t m) { return (n + m - 1) / m; }
+static size_t RoundUp(size_t n, size_t m) { return DivUp(n, m) * m; }
+
+// Returns the size to the nearest equal or larger value that can be
+// expressed exactly as a tag value.
+static size_t RoundUpForTag(size_t size) {
+ return RoundUp(size, (size <= 1024) ? 8 : 32);
+}
+
+// Converts the allocated size to a tag, rounding down if the size
+// does not exactly match a 'tag expressible' size value. The result is
+// undefined if the size exceeds the maximum size that can be encoded in
+// a tag, i.e., if size is larger than TagToAllocatedSize(<max tag>).
+static uint8_t AllocatedSizeToTag(size_t size) {
+ const size_t tag = (size <= 1024) ? size / 8 : 128 + size / 32 - 1024 / 32;
+ assert(tag <= std::numeric_limits<uint8_t>::max());
+ return tag;
+}
+
+// Converts the provided tag to the corresponding allocated size
+static constexpr size_t TagToAllocatedSize(uint8_t tag) {
+ return (tag <= 128) ? (tag * 8) : (1024 + (tag - 128) * 32);
+}
+
+// Converts the provided tag to the corresponding available data length
+static constexpr size_t TagToLength(uint8_t tag) {
+ return TagToAllocatedSize(tag) - kFlatOverhead;
+}
+
+// Enforce that kMaxFlatSize maps to a well-known exact tag value.
+static_assert(TagToAllocatedSize(224) == kMaxFlatSize, "Bad tag logic");
+
+constexpr uint64_t Fibonacci(unsigned char n, uint64_t a = 0, uint64_t b = 1) {
+ return n == 0 ? a : Fibonacci(n - 1, b, a + b);
+}
+
+static_assert(Fibonacci(63) == 6557470319842,
+ "Fibonacci values computed incorrectly");
+
+// Minimum length required for a given depth tree -- a tree is considered
+// balanced if
+// length(t) >= min_length[depth(t)]
+// The root node depth is allowed to become twice as large to reduce rebalancing
+// for larger strings (see IsRootBalanced).
+static constexpr uint64_t min_length[] = {
+ Fibonacci(2), Fibonacci(3), Fibonacci(4), Fibonacci(5),
+ Fibonacci(6), Fibonacci(7), Fibonacci(8), Fibonacci(9),
+ Fibonacci(10), Fibonacci(11), Fibonacci(12), Fibonacci(13),
+ Fibonacci(14), Fibonacci(15), Fibonacci(16), Fibonacci(17),
+ Fibonacci(18), Fibonacci(19), Fibonacci(20), Fibonacci(21),
+ Fibonacci(22), Fibonacci(23), Fibonacci(24), Fibonacci(25),
+ Fibonacci(26), Fibonacci(27), Fibonacci(28), Fibonacci(29),
+ Fibonacci(30), Fibonacci(31), Fibonacci(32), Fibonacci(33),
+ Fibonacci(34), Fibonacci(35), Fibonacci(36), Fibonacci(37),
+ Fibonacci(38), Fibonacci(39), Fibonacci(40), Fibonacci(41),
+ Fibonacci(42), Fibonacci(43), Fibonacci(44), Fibonacci(45),
+ Fibonacci(46), Fibonacci(47),
+ 0xffffffffffffffffull, // Avoid overflow
+};
+
+static const int kMinLengthSize = ABSL_ARRAYSIZE(min_length);
+
+// The inlined size to use with absl::InlinedVector.
+//
+// Note: The InlinedVectors in this file (and in cord.h) do not need to use
+// the same value for their inlined size. The fact that they do is historical.
+// It may be desirable for each to use a different inlined size optimized for
+// that InlinedVector's usage.
+//
+// TODO(jgm): Benchmark to see if there's a more optimal value than 47 for
+// the inlined vector size (47 exists for backward compatibility).
+static const int kInlinedVectorSize = 47;
+
+static inline bool IsRootBalanced(CordRep* node) {
+ if (node->tag != CONCAT) {
+ return true;
+ } else if (node->concat()->depth() <= 15) {
+ return true;
+ } else if (node->concat()->depth() > kMinLengthSize) {
+ return false;
+ } else {
+ // Allow depth to become twice as large as implied by fibonacci rule to
+ // reduce rebalancing for larger strings.
+ return (node->length >= min_length[node->concat()->depth() / 2]);
+ }
+}
+
+static CordRep* Rebalance(CordRep* node);
+static void DumpNode(CordRep* rep, bool include_data, std::ostream* os);
+static bool VerifyNode(CordRep* root, CordRep* start_node,
+ bool full_validation);
+
+static inline CordRep* VerifyTree(CordRep* node) {
+ // Verification is expensive, so only do it in debug mode.
+ // Even in debug mode we normally do only light validation.
+ // If you are debugging Cord itself, you should define the
+ // macro EXTRA_CORD_VALIDATION, e.g. by adding
+ // --copt=-DEXTRA_CORD_VALIDATION to the blaze line.
+#ifdef EXTRA_CORD_VALIDATION
+ assert(node == nullptr || VerifyNode(node, node, /*full_validation=*/true));
+#else // EXTRA_CORD_VALIDATION
+ assert(node == nullptr || VerifyNode(node, node, /*full_validation=*/false));
+#endif // EXTRA_CORD_VALIDATION
+ static_cast<void>(&VerifyNode);
+
+ return node;
+}
+
+// --------------------------------------------------------------------
+// Memory management
+
+inline CordRep* Ref(CordRep* rep) {
+ if (rep != nullptr) {
+ rep->refcount.Increment();
+ }
+ return rep;
+}
+
+// This internal routine is called from the cold path of Unref below. Keeping it
+// in a separate routine allows good inlining of Unref into many profitable call
+// sites. However, the call to this function can be highly disruptive to the
+// register pressure in those callers. To minimize the cost to callers, we use
+// a special LLVM calling convention that preserves most registers. This allows
+// the call to this routine in cold paths to not disrupt the caller's register
+// pressure. This calling convention is not available on all platforms; we
+// intentionally allow LLVM to ignore the attribute rather than attempting to
+// hardcode the list of supported platforms.
+#if defined(__clang__) && !defined(__i386__)
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wattributes"
+__attribute__((preserve_most))
+#pragma clang diagnostic pop
+#endif
+static void UnrefInternal(CordRep* rep) {
+ assert(rep != nullptr);
+
+ absl::InlinedVector<CordRep*, kInlinedVectorSize> pending;
+ while (true) {
+ assert(!rep->refcount.IsImmortal());
+ if (rep->tag == CONCAT) {
+ CordRepConcat* rep_concat = rep->concat();
+ CordRep* right = rep_concat->right;
+ if (!right->refcount.Decrement()) {
+ pending.push_back(right);
+ }
+ CordRep* left = rep_concat->left;
+ delete rep_concat;
+ rep = nullptr;
+ if (!left->refcount.Decrement()) {
+ rep = left;
+ continue;
+ }
+ } else if (rep->tag == EXTERNAL) {
+ CordRepExternal* rep_external = rep->external();
+ assert(rep_external->releaser_invoker != nullptr);
+ rep_external->releaser_invoker(rep_external);
+ rep = nullptr;
+ } else if (rep->tag == SUBSTRING) {
+ CordRepSubstring* rep_substring = rep->substring();
+ CordRep* child = rep_substring->child;
+ delete rep_substring;
+ rep = nullptr;
+ if (!child->refcount.Decrement()) {
+ rep = child;
+ continue;
+ }
+ } else {
+ // Flat CordReps are allocated and constructed with raw ::operator new
+ // and placement new, and must be destructed and deallocated
+ // accordingly.
+#if defined(__cpp_sized_deallocation)
+ size_t size = TagToAllocatedSize(rep->tag);
+ rep->~CordRep();
+ ::operator delete(rep, size);
+#else
+ rep->~CordRep();
+ ::operator delete(rep);
+#endif
+ rep = nullptr;
+ }
+
+ if (!pending.empty()) {
+ rep = pending.back();
+ pending.pop_back();
+ } else {
+ break;
+ }
+ }
+}
+
+inline void Unref(CordRep* rep) {
+ // Fast-path for two common, hot cases: a null rep and a shared root.
+ if (ABSL_PREDICT_TRUE(rep == nullptr ||
+ rep->refcount.DecrementExpectHighRefcount())) {
+ return;
+ }
+
+ UnrefInternal(rep);
+}
+
+// Return the depth of a node
+static int Depth(const CordRep* rep) {
+ if (rep->tag == CONCAT) {
+ return rep->concat()->depth();
+ } else {
+ return 0;
+ }
+}
+
+static void SetConcatChildren(CordRepConcat* concat, CordRep* left,
+ CordRep* right) {
+ concat->left = left;
+ concat->right = right;
+
+ concat->length = left->length + right->length;
+ concat->set_depth(1 + std::max(Depth(left), Depth(right)));
+}
+
+// Create a concatenation of the specified nodes.
+// Does not change the refcounts of "left" and "right".
+// The returned node has a refcount of 1.
+static CordRep* RawConcat(CordRep* left, CordRep* right) {
+ // Avoid making degenerate concat nodes (one child is empty)
+ if (left == nullptr || left->length == 0) {
+ Unref(left);
+ return right;
+ }
+ if (right == nullptr || right->length == 0) {
+ Unref(right);
+ return left;
+ }
+
+ CordRepConcat* rep = new CordRepConcat();
+ rep->tag = CONCAT;
+ SetConcatChildren(rep, left, right);
+
+ return rep;
+}
+
+static CordRep* Concat(CordRep* left, CordRep* right) {
+ CordRep* rep = RawConcat(left, right);
+ if (rep != nullptr && !IsRootBalanced(rep)) {
+ rep = Rebalance(rep);
+ }
+ return VerifyTree(rep);
+}
+
+// Make a balanced tree out of an array of leaf nodes.
+static CordRep* MakeBalancedTree(CordRep** reps, size_t n) {
+ // Make repeated passes over the array, merging adjacent pairs
+ // until we are left with just a single node.
+ while (n > 1) {
+ size_t dst = 0;
+ for (size_t src = 0; src < n; src += 2) {
+ if (src + 1 < n) {
+ reps[dst] = Concat(reps[src], reps[src + 1]);
+ } else {
+ reps[dst] = reps[src];
+ }
+ dst++;
+ }
+ n = dst;
+ }
+
+ return reps[0];
+}
+
+// Create a new flat node.
+static CordRep* NewFlat(size_t length_hint) {
+ if (length_hint <= kMinFlatLength) {
+ length_hint = kMinFlatLength;
+ } else if (length_hint > kMaxFlatLength) {
+ length_hint = kMaxFlatLength;
+ }
+
+ // Round size up so it matches a size we can exactly express in a tag.
+ const size_t size = RoundUpForTag(length_hint + kFlatOverhead);
+ void* const raw_rep = ::operator new(size);
+ CordRep* rep = new (raw_rep) CordRep();
+ rep->tag = AllocatedSizeToTag(size);
+ return VerifyTree(rep);
+}
+
+// Create a new tree out of the specified array.
+// The returned node has a refcount of 1.
+static CordRep* NewTree(const char* data,
+ size_t length,
+ size_t alloc_hint) {
+ if (length == 0) return nullptr;
+ absl::FixedArray<CordRep*> reps((length - 1) / kMaxFlatLength + 1);
+ size_t n = 0;
+ do {
+ const size_t len = std::min(length, kMaxFlatLength);
+ CordRep* rep = NewFlat(len + alloc_hint);
+ rep->length = len;
+ memcpy(rep->data, data, len);
+ reps[n++] = VerifyTree(rep);
+ data += len;
+ length -= len;
+ } while (length != 0);
+ return MakeBalancedTree(reps.data(), n);
+}
+
+namespace cord_internal {
+
+void InitializeCordRepExternal(absl::string_view data, CordRepExternal* rep) {
+ assert(!data.empty());
+ rep->length = data.size();
+ rep->tag = EXTERNAL;
+ rep->base = data.data();
+ VerifyTree(rep);
+}
+
+} // namespace cord_internal
+
+static CordRep* NewSubstring(CordRep* child, size_t offset, size_t length) {
+ // Never create empty substring nodes
+ if (length == 0) {
+ Unref(child);
+ return nullptr;
+ } else {
+ CordRepSubstring* rep = new CordRepSubstring();
+ assert((offset + length) <= child->length);
+ rep->length = length;
+ rep->tag = SUBSTRING;
+ rep->start = offset;
+ rep->child = child;
+ return VerifyTree(rep);
+ }
+}
+
+// --------------------------------------------------------------------
+// Cord::InlineRep functions
+
+constexpr unsigned char Cord::InlineRep::kMaxInline;
+
+inline void Cord::InlineRep::set_data(const char* data, size_t n,
+ bool nullify_tail) {
+ static_assert(kMaxInline == 15, "set_data is hard-coded for a length of 15");
+
+ cord_internal::SmallMemmove(data_.as_chars, data, n, nullify_tail);
+ set_tagged_size(static_cast<char>(n));
+}
+
+inline char* Cord::InlineRep::set_data(size_t n) {
+ assert(n <= kMaxInline);
+ ResetToEmpty();
+ set_tagged_size(static_cast<char>(n));
+ return data_.as_chars;
+}
+
+inline CordRep* Cord::InlineRep::force_tree(size_t extra_hint) {
+ size_t len = tagged_size();
+ if (len > kMaxInline) {
+ return data_.as_tree.rep;
+ }
+
+ CordRep* result = NewFlat(len + extra_hint);
+ result->length = len;
+ static_assert(kMinFlatLength >= sizeof(data_.as_chars), "");
+ memcpy(result->data, data_.as_chars, sizeof(data_.as_chars));
+ set_tree(result);
+ return result;
+}
+
+inline void Cord::InlineRep::reduce_size(size_t n) {
+ size_t tag = tagged_size();
+ assert(tag <= kMaxInline);
+ assert(tag >= n);
+ tag -= n;
+ memset(data_.as_chars + tag, 0, n);
+ set_tagged_size(static_cast<char>(tag));
+}
+
+inline void Cord::InlineRep::remove_prefix(size_t n) {
+ cord_internal::SmallMemmove(data_.as_chars, data_.as_chars + n,
+ tagged_size() - n);
+ reduce_size(n);
+}
+
+void Cord::InlineRep::AppendTree(CordRep* tree) {
+ if (tree == nullptr) return;
+ size_t len = tagged_size();
+ if (len == 0) {
+ set_tree(tree);
+ } else {
+ set_tree(Concat(force_tree(0), tree));
+ }
+}
+
+void Cord::InlineRep::PrependTree(CordRep* tree) {
+ assert(tree != nullptr);
+ size_t len = tagged_size();
+ if (len == 0) {
+ set_tree(tree);
+ } else {
+ set_tree(Concat(tree, force_tree(0)));
+ }
+}
+
+// Searches for a non-full flat node at the rightmost leaf of the tree. If a
+// suitable leaf is found, the function will update the length field for all
+// nodes to account for the size increase. The append region address will be
+// written to region and the actual size increase will be written to size.
+static inline bool PrepareAppendRegion(CordRep* root, char** region,
+ size_t* size, size_t max_length) {
+ // Search down the right-hand path for a non-full FLAT node.
+ CordRep* dst = root;
+ while (dst->tag == CONCAT && dst->refcount.IsOne()) {
+ dst = dst->concat()->right;
+ }
+
+ if (dst->tag < FLAT || !dst->refcount.IsOne()) {
+ *region = nullptr;
+ *size = 0;
+ return false;
+ }
+
+ const size_t in_use = dst->length;
+ const size_t capacity = TagToLength(dst->tag);
+ if (in_use == capacity) {
+ *region = nullptr;
+ *size = 0;
+ return false;
+ }
+
+ size_t size_increase = std::min(capacity - in_use, max_length);
+
+ // We need to update the length fields for all nodes, including the leaf node.
+ for (CordRep* rep = root; rep != dst; rep = rep->concat()->right) {
+ rep->length += size_increase;
+ }
+ dst->length += size_increase;
+
+ *region = dst->data + in_use;
+ *size = size_increase;
+ return true;
+}
+
+void Cord::InlineRep::GetAppendRegion(char** region, size_t* size,
+ size_t max_length) {
+ if (max_length == 0) {
+ *region = nullptr;
+ *size = 0;
+ return;
+ }
+
+ // Try to fit in the inline buffer if possible.
+ size_t inline_length = tagged_size();
+ if (inline_length < kMaxInline && max_length <= kMaxInline - inline_length) {
+ *region = data_.as_chars + inline_length;
+ *size = max_length;
+ set_tagged_size(static_cast<char>(inline_length + max_length));
+ return;
+ }
+
+ CordRep* root = force_tree(max_length);
+
+ if (PrepareAppendRegion(root, region, size, max_length)) {
+ return;
+ }
+
+ // Allocate new node.
+ CordRep* new_node =
+ NewFlat(std::max(static_cast<size_t>(root->length), max_length));
+ new_node->length =
+ std::min(static_cast<size_t>(TagToLength(new_node->tag)), max_length);
+ *region = new_node->data;
+ *size = new_node->length;
+ replace_tree(Concat(root, new_node));
+}
+
+void Cord::InlineRep::GetAppendRegion(char** region, size_t* size) {
+ const size_t max_length = std::numeric_limits<size_t>::max();
+
+ // Try to fit in the inline buffer if possible.
+ size_t inline_length = tagged_size();
+ if (inline_length < kMaxInline) {
+ *region = data_.as_chars + inline_length;
+ *size = kMaxInline - inline_length;
+ set_tagged_size(kMaxInline);
+ return;
+ }
+
+ CordRep* root = force_tree(max_length);
+
+ if (PrepareAppendRegion(root, region, size, max_length)) {
+ return;
+ }
+
+ // Allocate new node.
+ CordRep* new_node = NewFlat(root->length);
+ new_node->length = TagToLength(new_node->tag);
+ *region = new_node->data;
+ *size = new_node->length;
+ replace_tree(Concat(root, new_node));
+}
+
+// If the rep is a leaf, this will increment the value at total_mem_usage and
+// will return true.
+static bool RepMemoryUsageLeaf(const CordRep* rep, size_t* total_mem_usage) {
+ if (rep->tag >= FLAT) {
+ *total_mem_usage += TagToAllocatedSize(rep->tag);
+ return true;
+ }
+ if (rep->tag == EXTERNAL) {
+ *total_mem_usage += sizeof(CordRepConcat) + rep->length;
+ return true;
+ }
+ return false;
+}
+
+void Cord::InlineRep::AssignSlow(const Cord::InlineRep& src) {
+ ClearSlow();
+
+ data_ = src.data_;
+ if (is_tree()) {
+ Ref(tree());
+ }
+}
+
+void Cord::InlineRep::ClearSlow() {
+ if (is_tree()) {
+ Unref(tree());
+ }
+ ResetToEmpty();
+}
+
+// --------------------------------------------------------------------
+// Constructors and destructors
+
+Cord::Cord(const Cord& src) : contents_(src.contents_) {
+ Ref(contents_.tree()); // Does nothing if contents_ has embedded data
+}
+
+Cord::Cord(absl::string_view src) {
+ const size_t n = src.size();
+ if (n <= InlineRep::kMaxInline) {
+ contents_.set_data(src.data(), n, false);
+ } else {
+ contents_.set_tree(NewTree(src.data(), n, 0));
+ }
+}
+
+template <typename T, Cord::EnableIfString<T>>
+Cord::Cord(T&& src) {
+ if (
+ // String is short: copy data to avoid external block overhead.
+ src.size() <= kMaxBytesToCopy ||
+ // String is wasteful: copy data to avoid pinning too much unused memory.
+ src.size() < src.capacity() / 2
+ ) {
+ if (src.size() <= InlineRep::kMaxInline) {
+ contents_.set_data(src.data(), src.size(), false);
+ } else {
+ contents_.set_tree(NewTree(src.data(), src.size(), 0));
+ }
+ } else {
+ struct StringReleaser {
+ void operator()(absl::string_view /* data */) {}
+ std::string data;
+ };
+ const absl::string_view original_data = src;
+ auto* rep = static_cast<
+ ::absl::cord_internal::CordRepExternalImpl<StringReleaser>*>(
+ absl::cord_internal::NewExternalRep(
+ original_data, StringReleaser{std::forward<T>(src)}));
+ // Moving src may have invalidated its data pointer, so adjust it.
+ rep->base = rep->template get<0>().data.data();
+ contents_.set_tree(rep);
+ }
+}
+
+template Cord::Cord(std::string&& src);
+
+// The destruction code is separate so that the compiler can determine
+// that it does not need to call the destructor on a moved-from Cord.
+void Cord::DestroyCordSlow() {
+ Unref(VerifyTree(contents_.tree()));
+}
+
+// --------------------------------------------------------------------
+// Mutators
+
+void Cord::Clear() {
+ Unref(contents_.clear());
+}
+
+Cord& Cord::operator=(absl::string_view src) {
+
+ const char* data = src.data();
+ size_t length = src.size();
+ CordRep* tree = contents_.tree();
+ if (length <= InlineRep::kMaxInline) {
+ // Embed into this->contents_
+ contents_.set_data(data, length, true);
+ Unref(tree);
+ return *this;
+ }
+ if (tree != nullptr && tree->tag >= FLAT &&
+ TagToLength(tree->tag) >= length && tree->refcount.IsOne()) {
+ // Copy in place if the existing FLAT node is reusable.
+ memmove(tree->data, data, length);
+ tree->length = length;
+ VerifyTree(tree);
+ return *this;
+ }
+ contents_.set_tree(NewTree(data, length, 0));
+ Unref(tree);
+ return *this;
+}
+
+template <typename T, Cord::EnableIfString<T>>
+Cord& Cord::operator=(T&& src) {
+ if (src.size() <= kMaxBytesToCopy) {
+ *this = absl::string_view(src);
+ } else {
+ *this = Cord(std::forward<T>(src));
+ }
+ return *this;
+}
+
+template Cord& Cord::operator=(std::string&& src);
+
+// TODO(sanjay): Move to Cord::InlineRep section of file. For now,
+// we keep it here to make diffs easier.
+void Cord::InlineRep::AppendArray(const char* src_data, size_t src_size) {
+ if (src_size == 0) return; // memcpy(_, nullptr, 0) is undefined.
+ // Try to fit in the inline buffer if possible.
+ size_t inline_length = tagged_size();
+ if (inline_length < kMaxInline && src_size <= kMaxInline - inline_length) {
+ // Append new data to embedded array
+ set_tagged_size(static_cast<char>(inline_length + src_size));
+ memcpy(data_.as_chars + inline_length, src_data, src_size);
+ return;
+ }
+
+ CordRep* root = tree();
+
+ size_t appended = 0;
+ if (root) {
+ char* region;
+ if (PrepareAppendRegion(root, ®ion, &appended, src_size)) {
+ memcpy(region, src_data, appended);
+ }
+ } else {
+ // It is possible that src_data == data_, but when we transition from an
+ // InlineRep to a tree we need to assign data_ = root via set_tree. To
+ // avoid corrupting the source data before we copy it, delay calling
+ // set_tree until after we've copied data.
+ // We are going from an inline size to beyond inline size. Make the new size
+ // either double the inlined size, or the added size + 10%.
+ const size_t size1 = inline_length * 2 + src_size;
+ const size_t size2 = inline_length + src_size / 10;
+ root = NewFlat(std::max<size_t>(size1, size2));
+ appended = std::min(src_size, TagToLength(root->tag) - inline_length);
+ memcpy(root->data, data_.as_chars, inline_length);
+ memcpy(root->data + inline_length, src_data, appended);
+ root->length = inline_length + appended;
+ set_tree(root);
+ }
+
+ src_data += appended;
+ src_size -= appended;
+ if (src_size == 0) {
+ return;
+ }
+
+ // Use new block(s) for any remaining bytes that were not handled above.
+ // Alloc extra memory only if the right child of the root of the new tree is
+ // going to be a FLAT node, which will permit further inplace appends.
+ size_t length = src_size;
+ if (src_size < kMaxFlatLength) {
+ // The new length is either
+ // - old size + 10%
+ // - old_size + src_size
+ // This will cause a reasonable conservative step-up in size that is still
+ // large enough to avoid excessive amounts of small fragments being added.
+ length = std::max<size_t>(root->length / 10, src_size);
+ }
+ set_tree(Concat(root, NewTree(src_data, src_size, length - src_size)));
+}
+
+inline CordRep* Cord::TakeRep() const& {
+ return Ref(contents_.tree());
+}
+
+inline CordRep* Cord::TakeRep() && {
+ CordRep* rep = contents_.tree();
+ contents_.clear();
+ return rep;
+}
+
+template <typename C>
+inline void Cord::AppendImpl(C&& src) {
+ if (empty()) {
+ // In case of an empty destination avoid allocating a new node, do not copy
+ // data.
+ *this = std::forward<C>(src);
+ return;
+ }
+
+ // For short cords, it is faster to copy data if there is room in dst.
+ const size_t src_size = src.contents_.size();
+ if (src_size <= kMaxBytesToCopy) {
+ CordRep* src_tree = src.contents_.tree();
+ if (src_tree == nullptr) {
+ // src has embedded data.
+ contents_.AppendArray(src.contents_.data(), src_size);
+ return;
+ }
+ if (src_tree->tag >= FLAT) {
+ // src tree just has one flat node.
+ contents_.AppendArray(src_tree->data, src_size);
+ return;
+ }
+ if (&src == this) {
+ // ChunkIterator below assumes that src is not modified during traversal.
+ Append(Cord(src));
+ return;
+ }
+ // TODO(mec): Should we only do this if "dst" has space?
+ for (absl::string_view chunk : src.Chunks()) {
+ Append(chunk);
+ }
+ return;
+ }
+
+ contents_.AppendTree(std::forward<C>(src).TakeRep());
+}
+
+void Cord::Append(const Cord& src) { AppendImpl(src); }
+
+void Cord::Append(Cord&& src) { AppendImpl(std::move(src)); }
+
+template <typename T, Cord::EnableIfString<T>>
+void Cord::Append(T&& src) {
+ if (src.size() <= kMaxBytesToCopy) {
+ Append(absl::string_view(src));
+ } else {
+ Append(Cord(std::forward<T>(src)));
+ }
+}
+
+template void Cord::Append(std::string&& src);
+
+void Cord::Prepend(const Cord& src) {
+ CordRep* src_tree = src.contents_.tree();
+ if (src_tree != nullptr) {
+ Ref(src_tree);
+ contents_.PrependTree(src_tree);
+ return;
+ }
+
+ // `src` cord is inlined.
+ absl::string_view src_contents(src.contents_.data(), src.contents_.size());
+ return Prepend(src_contents);
+}
+
+void Cord::Prepend(absl::string_view src) {
+ if (src.empty()) return; // memcpy(_, nullptr, 0) is undefined.
+ size_t cur_size = contents_.size();
+ if (!contents_.is_tree() && cur_size + src.size() <= InlineRep::kMaxInline) {
+ // Use embedded storage.
+ char data[InlineRep::kMaxInline + 1] = {0};
+ data[InlineRep::kMaxInline] = cur_size + src.size(); // set size
+ memcpy(data, src.data(), src.size());
+ memcpy(data + src.size(), contents_.data(), cur_size);
+ memcpy(reinterpret_cast<void*>(&contents_), data,
+ InlineRep::kMaxInline + 1);
+ } else {
+ contents_.PrependTree(NewTree(src.data(), src.size(), 0));
+ }
+}
+
+template <typename T, Cord::EnableIfString<T>>
+inline void Cord::Prepend(T&& src) {
+ if (src.size() <= kMaxBytesToCopy) {
+ Prepend(absl::string_view(src));
+ } else {
+ Prepend(Cord(std::forward<T>(src)));
+ }
+}
+
+template void Cord::Prepend(std::string&& src);
+
+static CordRep* RemovePrefixFrom(CordRep* node, size_t n) {
+ if (n >= node->length) return nullptr;
+ if (n == 0) return Ref(node);
+ absl::InlinedVector<CordRep*, kInlinedVectorSize> rhs_stack;
+
+ while (node->tag == CONCAT) {
+ assert(n <= node->length);
+ if (n < node->concat()->left->length) {
+ // Push right to stack, descend left.
+ rhs_stack.push_back(node->concat()->right);
+ node = node->concat()->left;
+ } else {
+ // Drop left, descend right.
+ n -= node->concat()->left->length;
+ node = node->concat()->right;
+ }
+ }
+ assert(n <= node->length);
+
+ if (n == 0) {
+ Ref(node);
+ } else {
+ size_t start = n;
+ size_t len = node->length - n;
+ if (node->tag == SUBSTRING) {
+ // Consider in-place update of node, similar to in RemoveSuffixFrom().
+ start += node->substring()->start;
+ node = node->substring()->child;
+ }
+ node = NewSubstring(Ref(node), start, len);
+ }
+ while (!rhs_stack.empty()) {
+ node = Concat(node, Ref(rhs_stack.back()));
+ rhs_stack.pop_back();
+ }
+ return node;
+}
+
+// RemoveSuffixFrom() is very similar to RemovePrefixFrom(), with the
+// exception that removing a suffix has an optimization where a node may be
+// edited in place iff that node and all its ancestors have a refcount of 1.
+static CordRep* RemoveSuffixFrom(CordRep* node, size_t n) {
+ if (n >= node->length) return nullptr;
+ if (n == 0) return Ref(node);
+ absl::InlinedVector<CordRep*, kInlinedVectorSize> lhs_stack;
+ bool inplace_ok = node->refcount.IsOne();
+
+ while (node->tag == CONCAT) {
+ assert(n <= node->length);
+ if (n < node->concat()->right->length) {
+ // Push left to stack, descend right.
+ lhs_stack.push_back(node->concat()->left);
+ node = node->concat()->right;
+ } else {
+ // Drop right, descend left.
+ n -= node->concat()->right->length;
+ node = node->concat()->left;
+ }
+ inplace_ok = inplace_ok && node->refcount.IsOne();
+ }
+ assert(n <= node->length);
+
+ if (n == 0) {
+ Ref(node);
+ } else if (inplace_ok && node->tag != EXTERNAL) {
+ // Consider making a new buffer if the current node capacity is much
+ // larger than the new length.
+ Ref(node);
+ node->length -= n;
+ } else {
+ size_t start = 0;
+ size_t len = node->length - n;
+ if (node->tag == SUBSTRING) {
+ start = node->substring()->start;
+ node = node->substring()->child;
+ }
+ node = NewSubstring(Ref(node), start, len);
+ }
+ while (!lhs_stack.empty()) {
+ node = Concat(Ref(lhs_stack.back()), node);
+ lhs_stack.pop_back();
+ }
+ return node;
+}
+
+void Cord::RemovePrefix(size_t n) {
+ ABSL_INTERNAL_CHECK(n <= size(),
+ absl::StrCat("Requested prefix size ", n,
+ " exceeds Cord's size ", size()));
+ CordRep* tree = contents_.tree();
+ if (tree == nullptr) {
+ contents_.remove_prefix(n);
+ } else {
+ CordRep* newrep = RemovePrefixFrom(tree, n);
+ Unref(tree);
+ contents_.replace_tree(VerifyTree(newrep));
+ }
+}
+
+void Cord::RemoveSuffix(size_t n) {
+ ABSL_INTERNAL_CHECK(n <= size(),
+ absl::StrCat("Requested suffix size ", n,
+ " exceeds Cord's size ", size()));
+ CordRep* tree = contents_.tree();
+ if (tree == nullptr) {
+ contents_.reduce_size(n);
+ } else {
+ CordRep* newrep = RemoveSuffixFrom(tree, n);
+ Unref(tree);
+ contents_.replace_tree(VerifyTree(newrep));
+ }
+}
+
+// Work item for NewSubRange().
+struct SubRange {
+ SubRange(CordRep* a_node, size_t a_pos, size_t a_n)
+ : node(a_node), pos(a_pos), n(a_n) {}
+ CordRep* node; // nullptr means concat last 2 results.
+ size_t pos;
+ size_t n;
+};
+
+static CordRep* NewSubRange(CordRep* node, size_t pos, size_t n) {
+ absl::InlinedVector<CordRep*, kInlinedVectorSize> results;
+ absl::InlinedVector<SubRange, kInlinedVectorSize> todo;
+ todo.push_back(SubRange(node, pos, n));
+ do {
+ const SubRange& sr = todo.back();
+ node = sr.node;
+ pos = sr.pos;
+ n = sr.n;
+ todo.pop_back();
+
+ if (node == nullptr) {
+ assert(results.size() >= 2);
+ CordRep* right = results.back();
+ results.pop_back();
+ CordRep* left = results.back();
+ results.pop_back();
+ results.push_back(Concat(left, right));
+ } else if (pos == 0 && n == node->length) {
+ results.push_back(Ref(node));
+ } else if (node->tag != CONCAT) {
+ if (node->tag == SUBSTRING) {
+ pos += node->substring()->start;
+ node = node->substring()->child;
+ }
+ results.push_back(NewSubstring(Ref(node), pos, n));
+ } else if (pos + n <= node->concat()->left->length) {
+ todo.push_back(SubRange(node->concat()->left, pos, n));
+ } else if (pos >= node->concat()->left->length) {
+ pos -= node->concat()->left->length;
+ todo.push_back(SubRange(node->concat()->right, pos, n));
+ } else {
+ size_t left_n = node->concat()->left->length - pos;
+ todo.push_back(SubRange(nullptr, 0, 0)); // Concat()
+ todo.push_back(SubRange(node->concat()->right, 0, n - left_n));
+ todo.push_back(SubRange(node->concat()->left, pos, left_n));
+ }
+ } while (!todo.empty());
+ assert(results.size() == 1);
+ return results[0];
+}
+
+Cord Cord::Subcord(size_t pos, size_t new_size) const {
+ Cord sub_cord;
+ size_t length = size();
+ if (pos > length) pos = length;
+ if (new_size > length - pos) new_size = length - pos;
+ CordRep* tree = contents_.tree();
+ if (tree == nullptr) {
+ // sub_cord is newly constructed, no need to re-zero-out the tail of
+ // contents_ memory.
+ sub_cord.contents_.set_data(contents_.data() + pos, new_size, false);
+ } else if (new_size == 0) {
+ // We want to return empty subcord, so nothing to do.
+ } else if (new_size <= InlineRep::kMaxInline) {
+ Cord::ChunkIterator it = chunk_begin();
+ it.AdvanceBytes(pos);
+ char* dest = sub_cord.contents_.data_.as_chars;
+ size_t remaining_size = new_size;
+ while (remaining_size > it->size()) {
+ cord_internal::SmallMemmove(dest, it->data(), it->size());
+ remaining_size -= it->size();
+ dest += it->size();
+ ++it;
+ }
+ cord_internal::SmallMemmove(dest, it->data(), remaining_size);
+ sub_cord.contents_.set_tagged_size(new_size);
+ } else {
+ sub_cord.contents_.set_tree(NewSubRange(tree, pos, new_size));
+ }
+ return sub_cord;
+}
+
+// --------------------------------------------------------------------
+// Balancing
+
+class CordForest {
+ public:
+ explicit CordForest(size_t length)
+ : root_length_(length), trees_(kMinLengthSize, nullptr) {}
+
+ void Build(CordRep* cord_root) {
+ std::vector<CordRep*> pending = {cord_root};
+
+ while (!pending.empty()) {
+ CordRep* node = pending.back();
+ pending.pop_back();
+ CheckNode(node);
+ if (ABSL_PREDICT_FALSE(node->tag != CONCAT)) {
+ AddNode(node);
+ continue;
+ }
+
+ CordRepConcat* concat_node = node->concat();
+ if (concat_node->depth() >= kMinLengthSize ||
+ concat_node->length < min_length[concat_node->depth()]) {
+ pending.push_back(concat_node->right);
+ pending.push_back(concat_node->left);
+
+ if (concat_node->refcount.IsOne()) {
+ concat_node->left = concat_freelist_;
+ concat_freelist_ = concat_node;
+ } else {
+ Ref(concat_node->right);
+ Ref(concat_node->left);
+ Unref(concat_node);
+ }
+ } else {
+ AddNode(node);
+ }
+ }
+ }
+
+ CordRep* ConcatNodes() {
+ CordRep* sum = nullptr;
+ for (auto* node : trees_) {
+ if (node == nullptr) continue;
+
+ sum = PrependNode(node, sum);
+ root_length_ -= node->length;
+ if (root_length_ == 0) break;
+ }
+ ABSL_INTERNAL_CHECK(sum != nullptr, "Failed to locate sum node");
+ return VerifyTree(sum);
+ }
+
+ private:
+ CordRep* AppendNode(CordRep* node, CordRep* sum) {
+ return (sum == nullptr) ? node : MakeConcat(sum, node);
+ }
+
+ CordRep* PrependNode(CordRep* node, CordRep* sum) {
+ return (sum == nullptr) ? node : MakeConcat(node, sum);
+ }
+
+ void AddNode(CordRep* node) {
+ CordRep* sum = nullptr;
+
+ // Collect together everything with which we will merge with node
+ int i = 0;
+ for (; node->length > min_length[i + 1]; ++i) {
+ auto& tree_at_i = trees_[i];
+
+ if (tree_at_i == nullptr) continue;
+ sum = PrependNode(tree_at_i, sum);
+ tree_at_i = nullptr;
+ }
+
+ sum = AppendNode(node, sum);
+
+ // Insert sum into appropriate place in the forest
+ for (; sum->length >= min_length[i]; ++i) {
+ auto& tree_at_i = trees_[i];
+ if (tree_at_i == nullptr) continue;
+
+ sum = MakeConcat(tree_at_i, sum);
+ tree_at_i = nullptr;
+ }
+
+ // min_length[0] == 1, which means sum->length >= min_length[0]
+ assert(i > 0);
+ trees_[i - 1] = sum;
+ }
+
+ // Make concat node trying to resue existing CordRepConcat nodes we
+ // already collected in the concat_freelist_.
+ CordRep* MakeConcat(CordRep* left, CordRep* right) {
+ if (concat_freelist_ == nullptr) return RawConcat(left, right);
+
+ CordRepConcat* rep = concat_freelist_;
+ if (concat_freelist_->left == nullptr) {
+ concat_freelist_ = nullptr;
+ } else {
+ concat_freelist_ = concat_freelist_->left->concat();
+ }
+ SetConcatChildren(rep, left, right);
+
+ return rep;
+ }
+
+ static void CheckNode(CordRep* node) {
+ ABSL_INTERNAL_CHECK(node->length != 0u, "");
+ if (node->tag == CONCAT) {
+ ABSL_INTERNAL_CHECK(node->concat()->left != nullptr, "");
+ ABSL_INTERNAL_CHECK(node->concat()->right != nullptr, "");
+ ABSL_INTERNAL_CHECK(node->length == (node->concat()->left->length +
+ node->concat()->right->length),
+ "");
+ }
+ }
+
+ size_t root_length_;
+
+ // use an inlined vector instead of a flat array to get bounds checking
+ absl::InlinedVector<CordRep*, kInlinedVectorSize> trees_;
+
+ // List of concat nodes we can re-use for Cord balancing.
+ CordRepConcat* concat_freelist_ = nullptr;
+};
+
+static CordRep* Rebalance(CordRep* node) {
+ VerifyTree(node);
+ assert(node->tag == CONCAT);
+
+ if (node->length == 0) {
+ return nullptr;
+ }
+
+ CordForest forest(node->length);
+ forest.Build(node);
+ return forest.ConcatNodes();
+}
+
+// --------------------------------------------------------------------
+// Comparators
+
+namespace {
+
+int ClampResult(int memcmp_res) {
+ return static_cast<int>(memcmp_res > 0) - static_cast<int>(memcmp_res < 0);
+}
+
+int CompareChunks(absl::string_view* lhs, absl::string_view* rhs,
+ size_t* size_to_compare) {
+ size_t compared_size = std::min(lhs->size(), rhs->size());
+ assert(*size_to_compare >= compared_size);
+ *size_to_compare -= compared_size;
+
+ int memcmp_res = ::memcmp(lhs->data(), rhs->data(), compared_size);
+ if (memcmp_res != 0) return memcmp_res;
+
+ lhs->remove_prefix(compared_size);
+ rhs->remove_prefix(compared_size);
+
+ return 0;
+}
+
+// This overload set computes comparison results from memcmp result. This
+// interface is used inside GenericCompare below. Differet implementations
+// are specialized for int and bool. For int we clamp result to {-1, 0, 1}
+// set. For bool we just interested in "value == 0".
+template <typename ResultType>
+ResultType ComputeCompareResult(int memcmp_res) {
+ return ClampResult(memcmp_res);
+}
+template <>
+bool ComputeCompareResult<bool>(int memcmp_res) {
+ return memcmp_res == 0;
+}
+
+} // namespace
+
+// Helper routine. Locates the first flat chunk of the Cord without
+// initializing the iterator.
+inline absl::string_view Cord::InlineRep::FindFlatStartPiece() const {
+ size_t n = tagged_size();
+ if (n <= kMaxInline) {
+ return absl::string_view(data_.as_chars, n);
+ }
+
+ CordRep* node = tree();
+ if (node->tag >= FLAT) {
+ return absl::string_view(node->data, node->length);
+ }
+
+ if (node->tag == EXTERNAL) {
+ return absl::string_view(node->external()->base, node->length);
+ }
+
+ // Walk down the left branches until we hit a non-CONCAT node.
+ while (node->tag == CONCAT) {
+ node = node->concat()->left;
+ }
+
+ // Get the child node if we encounter a SUBSTRING.
+ size_t offset = 0;
+ size_t length = node->length;
+ assert(length != 0);
+
+ if (node->tag == SUBSTRING) {
+ offset = node->substring()->start;
+ node = node->substring()->child;
+ }
+
+ if (node->tag >= FLAT) {
+ return absl::string_view(node->data + offset, length);
+ }
+
+ assert((node->tag == EXTERNAL) && "Expect FLAT or EXTERNAL node here");
+
+ return absl::string_view(node->external()->base + offset, length);
+}
+
+inline int Cord::CompareSlowPath(absl::string_view rhs, size_t compared_size,
+ size_t size_to_compare) const {
+ auto advance = [](Cord::ChunkIterator* it, absl::string_view* chunk) {
+ if (!chunk->empty()) return true;
+ ++*it;
+ if (it->bytes_remaining_ == 0) return false;
+ *chunk = **it;
+ return true;
+ };
+
+ Cord::ChunkIterator lhs_it = chunk_begin();
+
+ // compared_size is inside first chunk.
+ absl::string_view lhs_chunk =
+ (lhs_it.bytes_remaining_ != 0) ? *lhs_it : absl::string_view();
+ assert(compared_size <= lhs_chunk.size());
+ assert(compared_size <= rhs.size());
+ lhs_chunk.remove_prefix(compared_size);
+ rhs.remove_prefix(compared_size);
+ size_to_compare -= compared_size; // skip already compared size.
+
+ while (advance(&lhs_it, &lhs_chunk) && !rhs.empty()) {
+ int comparison_result = CompareChunks(&lhs_chunk, &rhs, &size_to_compare);
+ if (comparison_result != 0) return comparison_result;
+ if (size_to_compare == 0) return 0;
+ }
+
+ return static_cast<int>(rhs.empty()) - static_cast<int>(lhs_chunk.empty());
+}
+
+inline int Cord::CompareSlowPath(const Cord& rhs, size_t compared_size,
+ size_t size_to_compare) const {
+ auto advance = [](Cord::ChunkIterator* it, absl::string_view* chunk) {
+ if (!chunk->empty()) return true;
+ ++*it;
+ if (it->bytes_remaining_ == 0) return false;
+ *chunk = **it;
+ return true;
+ };
+
+ Cord::ChunkIterator lhs_it = chunk_begin();
+ Cord::ChunkIterator rhs_it = rhs.chunk_begin();
+
+ // compared_size is inside both first chunks.
+ absl::string_view lhs_chunk =
+ (lhs_it.bytes_remaining_ != 0) ? *lhs_it : absl::string_view();
+ absl::string_view rhs_chunk =
+ (rhs_it.bytes_remaining_ != 0) ? *rhs_it : absl::string_view();
+ assert(compared_size <= lhs_chunk.size());
+ assert(compared_size <= rhs_chunk.size());
+ lhs_chunk.remove_prefix(compared_size);
+ rhs_chunk.remove_prefix(compared_size);
+ size_to_compare -= compared_size; // skip already compared size.
+
+ while (advance(&lhs_it, &lhs_chunk) && advance(&rhs_it, &rhs_chunk)) {
+ int memcmp_res = CompareChunks(&lhs_chunk, &rhs_chunk, &size_to_compare);
+ if (memcmp_res != 0) return memcmp_res;
+ if (size_to_compare == 0) return 0;
+ }
+
+ return static_cast<int>(rhs_chunk.empty()) -
+ static_cast<int>(lhs_chunk.empty());
+}
+
+inline absl::string_view Cord::GetFirstChunk(const Cord& c) {
+ return c.contents_.FindFlatStartPiece();
+}
+inline absl::string_view Cord::GetFirstChunk(absl::string_view sv) {
+ return sv;
+}
+
+// Compares up to 'size_to_compare' bytes of 'lhs' with 'rhs'. It is assumed
+// that 'size_to_compare' is greater that size of smallest of first chunks.
+template <typename ResultType, typename RHS>
+ResultType GenericCompare(const Cord& lhs, const RHS& rhs,
+ size_t size_to_compare) {
+ absl::string_view lhs_chunk = Cord::GetFirstChunk(lhs);
+ absl::string_view rhs_chunk = Cord::GetFirstChunk(rhs);
+
+ size_t compared_size = std::min(lhs_chunk.size(), rhs_chunk.size());
+ assert(size_to_compare >= compared_size);
+ int memcmp_res = ::memcmp(lhs_chunk.data(), rhs_chunk.data(), compared_size);
+ if (compared_size == size_to_compare || memcmp_res != 0) {
+ return ComputeCompareResult<ResultType>(memcmp_res);
+ }
+
+ return ComputeCompareResult<ResultType>(
+ lhs.CompareSlowPath(rhs, compared_size, size_to_compare));
+}
+
+bool Cord::EqualsImpl(absl::string_view rhs, size_t size_to_compare) const {
+ return GenericCompare<bool>(*this, rhs, size_to_compare);
+}
+
+bool Cord::EqualsImpl(const Cord& rhs, size_t size_to_compare) const {
+ return GenericCompare<bool>(*this, rhs, size_to_compare);
+}
+
+template <typename RHS>
+inline int SharedCompareImpl(const Cord& lhs, const RHS& rhs) {
+ size_t lhs_size = lhs.size();
+ size_t rhs_size = rhs.size();
+ if (lhs_size == rhs_size) {
+ return GenericCompare<int>(lhs, rhs, lhs_size);
+ }
+ if (lhs_size < rhs_size) {
+ auto data_comp_res = GenericCompare<int>(lhs, rhs, lhs_size);
+ return data_comp_res == 0 ? -1 : data_comp_res;
+ }
+
+ auto data_comp_res = GenericCompare<int>(lhs, rhs, rhs_size);
+ return data_comp_res == 0 ? +1 : data_comp_res;
+}
+
+int Cord::Compare(absl::string_view rhs) const {
+ return SharedCompareImpl(*this, rhs);
+}
+
+int Cord::CompareImpl(const Cord& rhs) const {
+ return SharedCompareImpl(*this, rhs);
+}
+
+bool Cord::EndsWith(absl::string_view rhs) const {
+ size_t my_size = size();
+ size_t rhs_size = rhs.size();
+
+ if (my_size < rhs_size) return false;
+
+ Cord tmp(*this);
+ tmp.RemovePrefix(my_size - rhs_size);
+ return tmp.EqualsImpl(rhs, rhs_size);
+}
+
+bool Cord::EndsWith(const Cord& rhs) const {
+ size_t my_size = size();
+ size_t rhs_size = rhs.size();
+
+ if (my_size < rhs_size) return false;
+
+ Cord tmp(*this);
+ tmp.RemovePrefix(my_size - rhs_size);
+ return tmp.EqualsImpl(rhs, rhs_size);
+}
+
+// --------------------------------------------------------------------
+// Misc.
+
+Cord::operator std::string() const {
+ std::string s;
+ absl::CopyCordToString(*this, &s);
+ return s;
+}
+
+void CopyCordToString(const Cord& src, std::string* dst) {
+ if (!src.contents_.is_tree()) {
+ src.contents_.CopyTo(dst);
+ } else {
+ absl::strings_internal::STLStringResizeUninitialized(dst, src.size());
+ src.CopyToArraySlowPath(&(*dst)[0]);
+ }
+}
+
+void Cord::CopyToArraySlowPath(char* dst) const {
+ assert(contents_.is_tree());
+ absl::string_view fragment;
+ if (GetFlatAux(contents_.tree(), &fragment)) {
+ memcpy(dst, fragment.data(), fragment.size());
+ return;
+ }
+ for (absl::string_view chunk : Chunks()) {
+ memcpy(dst, chunk.data(), chunk.size());
+ dst += chunk.size();
+ }
+}
+
+Cord::ChunkIterator& Cord::ChunkIterator::operator++() {
+ ABSL_HARDENING_ASSERT(bytes_remaining_ > 0 &&
+ "Attempted to iterate past `end()`");
+ assert(bytes_remaining_ >= current_chunk_.size());
+ bytes_remaining_ -= current_chunk_.size();
+
+ if (stack_of_right_children_.empty()) {
+ assert(!current_chunk_.empty()); // Called on invalid iterator.
+ // We have reached the end of the Cord.
+ return *this;
+ }
+
+ // Process the next node on the stack.
+ CordRep* node = stack_of_right_children_.back();
+ stack_of_right_children_.pop_back();
+
+ // Walk down the left branches until we hit a non-CONCAT node. Save the
+ // right children to the stack for subsequent traversal.
+ while (node->tag == CONCAT) {
+ stack_of_right_children_.push_back(node->concat()->right);
+ node = node->concat()->left;
+ }
+
+ // Get the child node if we encounter a SUBSTRING.
+ size_t offset = 0;
+ size_t length = node->length;
+ if (node->tag == SUBSTRING) {
+ offset = node->substring()->start;
+ node = node->substring()->child;
+ }
+
+ assert(node->tag == EXTERNAL || node->tag >= FLAT);
+ assert(length != 0);
+ const char* data =
+ node->tag == EXTERNAL ? node->external()->base : node->data;
+ current_chunk_ = absl::string_view(data + offset, length);
+ current_leaf_ = node;
+ return *this;
+}
+
+Cord Cord::ChunkIterator::AdvanceAndReadBytes(size_t n) {
+ ABSL_HARDENING_ASSERT(bytes_remaining_ >= n &&
+ "Attempted to iterate past `end()`");
+ Cord subcord;
+
+ if (n <= InlineRep::kMaxInline) {
+ // Range to read fits in inline data. Flatten it.
+ char* data = subcord.contents_.set_data(n);
+ while (n > current_chunk_.size()) {
+ memcpy(data, current_chunk_.data(), current_chunk_.size());
+ data += current_chunk_.size();
+ n -= current_chunk_.size();
+ ++*this;
+ }
+ memcpy(data, current_chunk_.data(), n);
+ if (n < current_chunk_.size()) {
+ RemoveChunkPrefix(n);
+ } else if (n > 0) {
+ ++*this;
+ }
+ return subcord;
+ }
+ if (n < current_chunk_.size()) {
+ // Range to read is a proper subrange of the current chunk.
+ assert(current_leaf_ != nullptr);
+ CordRep* subnode = Ref(current_leaf_);
+ const char* data =
+ subnode->tag == EXTERNAL ? subnode->external()->base : subnode->data;
+ subnode = NewSubstring(subnode, current_chunk_.data() - data, n);
+ subcord.contents_.set_tree(VerifyTree(subnode));
+ RemoveChunkPrefix(n);
+ return subcord;
+ }
+
+ // Range to read begins with a proper subrange of the current chunk.
+ assert(!current_chunk_.empty());
+ assert(current_leaf_ != nullptr);
+ CordRep* subnode = Ref(current_leaf_);
+ if (current_chunk_.size() < subnode->length) {
+ const char* data =
+ subnode->tag == EXTERNAL ? subnode->external()->base : subnode->data;
+ subnode = NewSubstring(subnode, current_chunk_.data() - data,
+ current_chunk_.size());
+ }
+ n -= current_chunk_.size();
+ bytes_remaining_ -= current_chunk_.size();
+
+ // Process the next node(s) on the stack, reading whole subtrees depending on
+ // their length and how many bytes we are advancing.
+ CordRep* node = nullptr;
+ while (!stack_of_right_children_.empty()) {
+ node = stack_of_right_children_.back();
+ stack_of_right_children_.pop_back();
+ if (node->length > n) break;
+ // TODO(qrczak): This might unnecessarily recreate existing concat nodes.
+ // Avoiding that would need pretty complicated logic (instead of
+ // current_leaf_, keep current_subtree_ which points to the highest node
+ // such that the current leaf can be found on the path of left children
+ // starting from current_subtree_; delay creating subnode while node is
+ // below current_subtree_; find the proper node along the path of left
+ // children starting from current_subtree_ if this loop exits while staying
+ // below current_subtree_; etc.; alternatively, push parents instead of
+ // right children on the stack).
+ subnode = Concat(subnode, Ref(node));
+ n -= node->length;
+ bytes_remaining_ -= node->length;
+ node = nullptr;
+ }
+
+ if (node == nullptr) {
+ // We have reached the end of the Cord.
+ assert(bytes_remaining_ == 0);
+ subcord.contents_.set_tree(VerifyTree(subnode));
+ return subcord;
+ }
+
+ // Walk down the appropriate branches until we hit a non-CONCAT node. Save the
+ // right children to the stack for subsequent traversal.
+ while (node->tag == CONCAT) {
+ if (node->concat()->left->length > n) {
+ // Push right, descend left.
+ stack_of_right_children_.push_back(node->concat()->right);
+ node = node->concat()->left;
+ } else {
+ // Read left, descend right.
+ subnode = Concat(subnode, Ref(node->concat()->left));
+ n -= node->concat()->left->length;
+ bytes_remaining_ -= node->concat()->left->length;
+ node = node->concat()->right;
+ }
+ }
+
+ // Get the child node if we encounter a SUBSTRING.
+ size_t offset = 0;
+ size_t length = node->length;
+ if (node->tag == SUBSTRING) {
+ offset = node->substring()->start;
+ node = node->substring()->child;
+ }
+
+ // Range to read ends with a proper (possibly empty) subrange of the current
+ // chunk.
+ assert(node->tag == EXTERNAL || node->tag >= FLAT);
+ assert(length > n);
+ if (n > 0) subnode = Concat(subnode, NewSubstring(Ref(node), offset, n));
+ const char* data =
+ node->tag == EXTERNAL ? node->external()->base : node->data;
+ current_chunk_ = absl::string_view(data + offset + n, length - n);
+ current_leaf_ = node;
+ bytes_remaining_ -= n;
+ subcord.contents_.set_tree(VerifyTree(subnode));
+ return subcord;
+}
+
+void Cord::ChunkIterator::AdvanceBytesSlowPath(size_t n) {
+ assert(bytes_remaining_ >= n && "Attempted to iterate past `end()`");
+ assert(n >= current_chunk_.size()); // This should only be called when
+ // iterating to a new node.
+
+ n -= current_chunk_.size();
+ bytes_remaining_ -= current_chunk_.size();
+
+ // Process the next node(s) on the stack, skipping whole subtrees depending on
+ // their length and how many bytes we are advancing.
+ CordRep* node = nullptr;
+ while (!stack_of_right_children_.empty()) {
+ node = stack_of_right_children_.back();
+ stack_of_right_children_.pop_back();
+ if (node->length > n) break;
+ n -= node->length;
+ bytes_remaining_ -= node->length;
+ node = nullptr;
+ }
+
+ if (node == nullptr) {
+ // We have reached the end of the Cord.
+ assert(bytes_remaining_ == 0);
+ return;
+ }
+
+ // Walk down the appropriate branches until we hit a non-CONCAT node. Save the
+ // right children to the stack for subsequent traversal.
+ while (node->tag == CONCAT) {
+ if (node->concat()->left->length > n) {
+ // Push right, descend left.
+ stack_of_right_children_.push_back(node->concat()->right);
+ node = node->concat()->left;
+ } else {
+ // Skip left, descend right.
+ n -= node->concat()->left->length;
+ bytes_remaining_ -= node->concat()->left->length;
+ node = node->concat()->right;
+ }
+ }
+
+ // Get the child node if we encounter a SUBSTRING.
+ size_t offset = 0;
+ size_t length = node->length;
+ if (node->tag == SUBSTRING) {
+ offset = node->substring()->start;
+ node = node->substring()->child;
+ }
+
+ assert(node->tag == EXTERNAL || node->tag >= FLAT);
+ assert(length > n);
+ const char* data =
+ node->tag == EXTERNAL ? node->external()->base : node->data;
+ current_chunk_ = absl::string_view(data + offset + n, length - n);
+ current_leaf_ = node;
+ bytes_remaining_ -= n;
+}
+
+char Cord::operator[](size_t i) const {
+ ABSL_HARDENING_ASSERT(i < size());
+ size_t offset = i;
+ const CordRep* rep = contents_.tree();
+ if (rep == nullptr) {
+ return contents_.data()[i];
+ }
+ while (true) {
+ assert(rep != nullptr);
+ assert(offset < rep->length);
+ if (rep->tag >= FLAT) {
+ // Get the "i"th character directly from the flat array.
+ return rep->data[offset];
+ } else if (rep->tag == EXTERNAL) {
+ // Get the "i"th character from the external array.
+ return rep->external()->base[offset];
+ } else if (rep->tag == CONCAT) {
+ // Recursively branch to the side of the concatenation that the "i"th
+ // character is on.
+ size_t left_length = rep->concat()->left->length;
+ if (offset < left_length) {
+ rep = rep->concat()->left;
+ } else {
+ offset -= left_length;
+ rep = rep->concat()->right;
+ }
+ } else {
+ // This must be a substring a node, so bypass it to get to the child.
+ assert(rep->tag == SUBSTRING);
+ offset += rep->substring()->start;
+ rep = rep->substring()->child;
+ }
+ }
+}
+
+absl::string_view Cord::FlattenSlowPath() {
+ size_t total_size = size();
+ CordRep* new_rep;
+ char* new_buffer;
+
+ // Try to put the contents into a new flat rep. If they won't fit in the
+ // biggest possible flat node, use an external rep instead.
+ if (total_size <= kMaxFlatLength) {
+ new_rep = NewFlat(total_size);
+ new_rep->length = total_size;
+ new_buffer = new_rep->data;
+ CopyToArraySlowPath(new_buffer);
+ } else {
+ new_buffer = std::allocator<char>().allocate(total_size);
+ CopyToArraySlowPath(new_buffer);
+ new_rep = absl::cord_internal::NewExternalRep(
+ absl::string_view(new_buffer, total_size), [](absl::string_view s) {
+ std::allocator<char>().deallocate(const_cast<char*>(s.data()),
+ s.size());
+ });
+ }
+ Unref(contents_.tree());
+ contents_.set_tree(new_rep);
+ return absl::string_view(new_buffer, total_size);
+}
+
+/* static */ bool Cord::GetFlatAux(CordRep* rep, absl::string_view* fragment) {
+ assert(rep != nullptr);
+ if (rep->tag >= FLAT) {
+ *fragment = absl::string_view(rep->data, rep->length);
+ return true;
+ } else if (rep->tag == EXTERNAL) {
+ *fragment = absl::string_view(rep->external()->base, rep->length);
+ return true;
+ } else if (rep->tag == SUBSTRING) {
+ CordRep* child = rep->substring()->child;
+ if (child->tag >= FLAT) {
+ *fragment =
+ absl::string_view(child->data + rep->substring()->start, rep->length);
+ return true;
+ } else if (child->tag == EXTERNAL) {
+ *fragment = absl::string_view(
+ child->external()->base + rep->substring()->start, rep->length);
+ return true;
+ }
+ }
+ return false;
+}
+
+/* static */ void Cord::ForEachChunkAux(
+ absl::cord_internal::CordRep* rep,
+ absl::FunctionRef<void(absl::string_view)> callback) {
+ assert(rep != nullptr);
+ int stack_pos = 0;
+ constexpr int stack_max = 128;
+ // Stack of right branches for tree traversal
+ absl::cord_internal::CordRep* stack[stack_max];
+ absl::cord_internal::CordRep* current_node = rep;
+ while (true) {
+ if (current_node->tag == CONCAT) {
+ if (stack_pos == stack_max) {
+ // There's no more room on our stack array to add another right branch,
+ // and the idea is to avoid allocations, so call this function
+ // recursively to navigate this subtree further. (This is not something
+ // we expect to happen in practice).
+ ForEachChunkAux(current_node, callback);
+
+ // Pop the next right branch and iterate.
+ current_node = stack[--stack_pos];
+ continue;
+ } else {
+ // Save the right branch for later traversal and continue down the left
+ // branch.
+ stack[stack_pos++] = current_node->concat()->right;
+ current_node = current_node->concat()->left;
+ continue;
+ }
+ }
+ // This is a leaf node, so invoke our callback.
+ absl::string_view chunk;
+ bool success = GetFlatAux(current_node, &chunk);
+ assert(success);
+ if (success) {
+ callback(chunk);
+ }
+ if (stack_pos == 0) {
+ // end of traversal
+ return;
+ }
+ current_node = stack[--stack_pos];
+ }
+}
+
+static void DumpNode(CordRep* rep, bool include_data, std::ostream* os) {
+ const int kIndentStep = 1;
+ int indent = 0;
+ absl::InlinedVector<CordRep*, kInlinedVectorSize> stack;
+ absl::InlinedVector<int, kInlinedVectorSize> indents;
+ for (;;) {
+ *os << std::setw(3) << rep->refcount.Get();
+ *os << " " << std::setw(7) << rep->length;
+ *os << " [";
+ if (include_data) *os << static_cast<void*>(rep);
+ *os << "]";
+ *os << " " << (IsRootBalanced(rep) ? 'b' : 'u');
+ *os << " " << std::setw(indent) << "";
+ if (rep->tag == CONCAT) {
+ *os << "CONCAT depth=" << Depth(rep) << "\n";
+ indent += kIndentStep;
+ indents.push_back(indent);
+ stack.push_back(rep->concat()->right);
+ rep = rep->concat()->left;
+ } else if (rep->tag == SUBSTRING) {
+ *os << "SUBSTRING @ " << rep->substring()->start << "\n";
+ indent += kIndentStep;
+ rep = rep->substring()->child;
+ } else { // Leaf
+ if (rep->tag == EXTERNAL) {
+ *os << "EXTERNAL [";
+ if (include_data)
+ *os << absl::CEscape(std::string(rep->external()->base, rep->length));
+ *os << "]\n";
+ } else {
+ *os << "FLAT cap=" << TagToLength(rep->tag) << " [";
+ if (include_data)
+ *os << absl::CEscape(std::string(rep->data, rep->length));
+ *os << "]\n";
+ }
+ if (stack.empty()) break;
+ rep = stack.back();
+ stack.pop_back();
+ indent = indents.back();
+ indents.pop_back();
+ }
+ }
+ ABSL_INTERNAL_CHECK(indents.empty(), "");
+}
+
+static std::string ReportError(CordRep* root, CordRep* node) {
+ std::ostringstream buf;
+ buf << "Error at node " << node << " in:";
+ DumpNode(root, true, &buf);
+ return buf.str();
+}
+
+static bool VerifyNode(CordRep* root, CordRep* start_node,
+ bool full_validation) {
+ absl::InlinedVector<CordRep*, 2> worklist;
+ worklist.push_back(start_node);
+ do {
+ CordRep* node = worklist.back();
+ worklist.pop_back();
+
+ ABSL_INTERNAL_CHECK(node != nullptr, ReportError(root, node));
+ if (node != root) {
+ ABSL_INTERNAL_CHECK(node->length != 0, ReportError(root, node));
+ }
+
+ if (node->tag == CONCAT) {
+ ABSL_INTERNAL_CHECK(node->concat()->left != nullptr,
+ ReportError(root, node));
+ ABSL_INTERNAL_CHECK(node->concat()->right != nullptr,
+ ReportError(root, node));
+ ABSL_INTERNAL_CHECK((node->length == node->concat()->left->length +
+ node->concat()->right->length),
+ ReportError(root, node));
+ if (full_validation) {
+ worklist.push_back(node->concat()->right);
+ worklist.push_back(node->concat()->left);
+ }
+ } else if (node->tag >= FLAT) {
+ ABSL_INTERNAL_CHECK(node->length <= TagToLength(node->tag),
+ ReportError(root, node));
+ } else if (node->tag == EXTERNAL) {
+ ABSL_INTERNAL_CHECK(node->external()->base != nullptr,
+ ReportError(root, node));
+ } else if (node->tag == SUBSTRING) {
+ ABSL_INTERNAL_CHECK(
+ node->substring()->start < node->substring()->child->length,
+ ReportError(root, node));
+ ABSL_INTERNAL_CHECK(node->substring()->start + node->length <=
+ node->substring()->child->length,
+ ReportError(root, node));
+ }
+ } while (!worklist.empty());
+ return true;
+}
+
+// Traverses the tree and computes the total memory allocated.
+/* static */ size_t Cord::MemoryUsageAux(const CordRep* rep) {
+ size_t total_mem_usage = 0;
+
+ // Allow a quick exit for the common case that the root is a leaf.
+ if (RepMemoryUsageLeaf(rep, &total_mem_usage)) {
+ return total_mem_usage;
+ }
+
+ // Iterate over the tree. cur_node is never a leaf node and leaf nodes will
+ // never be appended to tree_stack. This reduces overhead from manipulating
+ // tree_stack.
+ absl::InlinedVector<const CordRep*, kInlinedVectorSize> tree_stack;
+ const CordRep* cur_node = rep;
+ while (true) {
+ const CordRep* next_node = nullptr;
+
+ if (cur_node->tag == CONCAT) {
+ total_mem_usage += sizeof(CordRepConcat);
+ const CordRep* left = cur_node->concat()->left;
+ if (!RepMemoryUsageLeaf(left, &total_mem_usage)) {
+ next_node = left;
+ }
+
+ const CordRep* right = cur_node->concat()->right;
+ if (!RepMemoryUsageLeaf(right, &total_mem_usage)) {
+ if (next_node) {
+ tree_stack.push_back(next_node);
+ }
+ next_node = right;
+ }
+ } else {
+ // Since cur_node is not a leaf or a concat node it must be a substring.
+ assert(cur_node->tag == SUBSTRING);
+ total_mem_usage += sizeof(CordRepSubstring);
+ next_node = cur_node->substring()->child;
+ if (RepMemoryUsageLeaf(next_node, &total_mem_usage)) {
+ next_node = nullptr;
+ }
+ }
+
+ if (!next_node) {
+ if (tree_stack.empty()) {
+ return total_mem_usage;
+ }
+ next_node = tree_stack.back();
+ tree_stack.pop_back();
+ }
+ cur_node = next_node;
+ }
+}
+
+std::ostream& operator<<(std::ostream& out, const Cord& cord) {
+ for (absl::string_view chunk : cord.Chunks()) {
+ out.write(chunk.data(), chunk.size());
+ }
+ return out;
+}
+
+namespace strings_internal {
+size_t CordTestAccess::FlatOverhead() { return kFlatOverhead; }
+size_t CordTestAccess::MaxFlatLength() { return kMaxFlatLength; }
+size_t CordTestAccess::FlatTagToLength(uint8_t tag) {
+ return TagToLength(tag);
+}
+uint8_t CordTestAccess::LengthToTag(size_t s) {
+ ABSL_INTERNAL_CHECK(s <= kMaxFlatLength, absl::StrCat("Invalid length ", s));
+ return AllocatedSizeToTag(s + kFlatOverhead);
+}
+size_t CordTestAccess::SizeofCordRepConcat() { return sizeof(CordRepConcat); }
+size_t CordTestAccess::SizeofCordRepExternal() {
+ return sizeof(CordRepExternal);
+}
+size_t CordTestAccess::SizeofCordRepSubstring() {
+ return sizeof(CordRepSubstring);
+}
+} // namespace strings_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/strings/cord.h b/third_party/abseil/src/absl/strings/cord.h
new file mode 100644
index 0000000..5d5c897
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/cord.h
@@ -0,0 +1,1299 @@
+// Copyright 2020 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: cord.h
+// -----------------------------------------------------------------------------
+//
+// This file defines the `absl::Cord` data structure and operations on that data
+// structure. A Cord is a string-like sequence of characters optimized for
+// specific use cases. Unlike a `std::string`, which stores an array of
+// contiguous characters, Cord data is stored in a structure consisting of
+// separate, reference-counted "chunks." (Currently, this implementation is a
+// tree structure, though that implementation may change.)
+//
+// Because a Cord consists of these chunks, data can be added to or removed from
+// a Cord during its lifetime. Chunks may also be shared between Cords. Unlike a
+// `std::string`, a Cord can therefore accomodate data that changes over its
+// lifetime, though it's not quite "mutable"; it can change only in the
+// attachment, detachment, or rearrangement of chunks of its constituent data.
+//
+// A Cord provides some benefit over `std::string` under the following (albeit
+// narrow) circumstances:
+//
+// * Cord data is designed to grow and shrink over a Cord's lifetime. Cord
+// provides efficient insertions and deletions at the start and end of the
+// character sequences, avoiding copies in those cases. Static data should
+// generally be stored as strings.
+// * External memory consisting of string-like data can be directly added to
+// a Cord without requiring copies or allocations.
+// * Cord data may be shared and copied cheaply. Cord provides a copy-on-write
+// implementation and cheap sub-Cord operations. Copying a Cord is an O(1)
+// operation.
+//
+// As a consequence to the above, Cord data is generally large. Small data
+// should generally use strings, as construction of a Cord requires some
+// overhead. Small Cords (<= 15 bytes) are represented inline, but most small
+// Cords are expected to grow over their lifetimes.
+//
+// Note that because a Cord is made up of separate chunked data, random access
+// to character data within a Cord is slower than within a `std::string`.
+//
+// Thread Safety
+//
+// Cord has the same thread-safety properties as many other types like
+// std::string, std::vector<>, int, etc -- it is thread-compatible. In
+// particular, if threads do not call non-const methods, then it is safe to call
+// const methods without synchronization. Copying a Cord produces a new instance
+// that can be used concurrently with the original in arbitrary ways.
+
+#ifndef ABSL_STRINGS_CORD_H_
+#define ABSL_STRINGS_CORD_H_
+
+#include <algorithm>
+#include <cstddef>
+#include <cstdint>
+#include <cstring>
+#include <iosfwd>
+#include <iterator>
+#include <string>
+#include <type_traits>
+
+#include "absl/base/internal/endian.h"
+#include "absl/base/internal/per_thread_tls.h"
+#include "absl/base/macros.h"
+#include "absl/base/port.h"
+#include "absl/container/inlined_vector.h"
+#include "absl/functional/function_ref.h"
+#include "absl/meta/type_traits.h"
+#include "absl/strings/internal/cord_internal.h"
+#include "absl/strings/internal/resize_uninitialized.h"
+#include "absl/strings/internal/string_constant.h"
+#include "absl/strings/string_view.h"
+#include "absl/types/optional.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+class Cord;
+class CordTestPeer;
+template <typename Releaser>
+Cord MakeCordFromExternal(absl::string_view, Releaser&&);
+void CopyCordToString(const Cord& src, std::string* dst);
+
+// Cord
+//
+// A Cord is a sequence of characters, designed to be more efficient than a
+// `std::string` in certain circumstances: namely, large string data that needs
+// to change over its lifetime or shared, especially when such data is shared
+// across API boundaries.
+//
+// A Cord stores its character data in a structure that allows efficient prepend
+// and append operations. This makes a Cord useful for large string data sent
+// over in a wire format that may need to be prepended or appended at some point
+// during the data exchange (e.g. HTTP, protocol buffers). For example, a
+// Cord is useful for storing an HTTP request, and prepending an HTTP header to
+// such a request.
+//
+// Cords should not be used for storing general string data, however. They
+// require overhead to construct and are slower than strings for random access.
+//
+// The Cord API provides the following common API operations:
+//
+// * Create or assign Cords out of existing string data, memory, or other Cords
+// * Append and prepend data to an existing Cord
+// * Create new Sub-Cords from existing Cord data
+// * Swap Cord data and compare Cord equality
+// * Write out Cord data by constructing a `std::string`
+//
+// Additionally, the API provides iterator utilities to iterate through Cord
+// data via chunks or character bytes.
+//
+class Cord {
+ private:
+ template <typename T>
+ using EnableIfString =
+ absl::enable_if_t<std::is_same<T, std::string>::value, int>;
+
+ public:
+ // Cord::Cord() Constructors.
+
+ // Creates an empty Cord.
+ constexpr Cord() noexcept;
+
+ // Creates a Cord from an existing Cord. Cord is copyable and efficiently
+ // movable. The moved-from state is valid but unspecified.
+ Cord(const Cord& src);
+ Cord(Cord&& src) noexcept;
+ Cord& operator=(const Cord& x);
+ Cord& operator=(Cord&& x) noexcept;
+
+ // Creates a Cord from a `src` string. This constructor is marked explicit to
+ // prevent implicit Cord constructions from arguments convertible to an
+ // `absl::string_view`.
+ explicit Cord(absl::string_view src);
+ Cord& operator=(absl::string_view src);
+
+ // Creates a Cord from a `std::string&&` rvalue. These constructors are
+ // templated to avoid ambiguities for types that are convertible to both
+ // `absl::string_view` and `std::string`, such as `const char*`.
+ template <typename T, EnableIfString<T> = 0>
+ explicit Cord(T&& src);
+ template <typename T, EnableIfString<T> = 0>
+ Cord& operator=(T&& src);
+
+ // Cord::~Cord()
+ //
+ // Destructs the Cord.
+ ~Cord() {
+ if (contents_.is_tree()) DestroyCordSlow();
+ }
+
+ // MakeCordFromExternal()
+ //
+ // Creates a Cord that takes ownership of external string memory. The
+ // contents of `data` are not copied to the Cord; instead, the external
+ // memory is added to the Cord and reference-counted. This data may not be
+ // changed for the life of the Cord, though it may be prepended or appended
+ // to.
+ //
+ // `MakeCordFromExternal()` takes a callable "releaser" that is invoked when
+ // the reference count for `data` reaches zero. As noted above, this data must
+ // remain live until the releaser is invoked. The callable releaser also must:
+ //
+ // * be move constructible
+ // * support `void operator()(absl::string_view) const` or `void operator()`
+ //
+ // Example:
+ //
+ // Cord MakeCord(BlockPool* pool) {
+ // Block* block = pool->NewBlock();
+ // FillBlock(block);
+ // return absl::MakeCordFromExternal(
+ // block->ToStringView(),
+ // [pool, block](absl::string_view v) {
+ // pool->FreeBlock(block, v);
+ // });
+ // }
+ //
+ // WARNING: Because a Cord can be reference-counted, it's likely a bug if your
+ // releaser doesn't do anything. For example, consider the following:
+ //
+ // void Foo(const char* buffer, int len) {
+ // auto c = absl::MakeCordFromExternal(absl::string_view(buffer, len),
+ // [](absl::string_view) {});
+ //
+ // // BUG: If Bar() copies its cord for any reason, including keeping a
+ // // substring of it, the lifetime of buffer might be extended beyond
+ // // when Foo() returns.
+ // Bar(c);
+ // }
+ template <typename Releaser>
+ friend Cord MakeCordFromExternal(absl::string_view data, Releaser&& releaser);
+
+ // Cord::Clear()
+ //
+ // Releases the Cord data. Any nodes that share data with other Cords, if
+ // applicable, will have their reference counts reduced by 1.
+ void Clear();
+
+ // Cord::Append()
+ //
+ // Appends data to the Cord, which may come from another Cord or other string
+ // data.
+ void Append(const Cord& src);
+ void Append(Cord&& src);
+ void Append(absl::string_view src);
+ template <typename T, EnableIfString<T> = 0>
+ void Append(T&& src);
+
+ // Cord::Prepend()
+ //
+ // Prepends data to the Cord, which may come from another Cord or other string
+ // data.
+ void Prepend(const Cord& src);
+ void Prepend(absl::string_view src);
+ template <typename T, EnableIfString<T> = 0>
+ void Prepend(T&& src);
+
+ // Cord::RemovePrefix()
+ //
+ // Removes the first `n` bytes of a Cord.
+ void RemovePrefix(size_t n);
+ void RemoveSuffix(size_t n);
+
+ // Cord::Subcord()
+ //
+ // Returns a new Cord representing the subrange [pos, pos + new_size) of
+ // *this. If pos >= size(), the result is empty(). If
+ // (pos + new_size) >= size(), the result is the subrange [pos, size()).
+ Cord Subcord(size_t pos, size_t new_size) const;
+
+ // Cord::swap()
+ //
+ // Swaps the contents of the Cord with `other`.
+ void swap(Cord& other) noexcept;
+
+ // swap()
+ //
+ // Swaps the contents of two Cords.
+ friend void swap(Cord& x, Cord& y) noexcept {
+ x.swap(y);
+ }
+
+ // Cord::size()
+ //
+ // Returns the size of the Cord.
+ size_t size() const;
+
+ // Cord::empty()
+ //
+ // Determines whether the given Cord is empty, returning `true` is so.
+ bool empty() const;
+
+ // Cord::EstimatedMemoryUsage()
+ //
+ // Returns the *approximate* number of bytes held in full or in part by this
+ // Cord (which may not remain the same between invocations). Note that Cords
+ // that share memory could each be "charged" independently for the same shared
+ // memory.
+ size_t EstimatedMemoryUsage() const;
+
+ // Cord::Compare()
+ //
+ // Compares 'this' Cord with rhs. This function and its relatives treat Cords
+ // as sequences of unsigned bytes. The comparison is a straightforward
+ // lexicographic comparison. `Cord::Compare()` returns values as follows:
+ //
+ // -1 'this' Cord is smaller
+ // 0 two Cords are equal
+ // 1 'this' Cord is larger
+ int Compare(absl::string_view rhs) const;
+ int Compare(const Cord& rhs) const;
+
+ // Cord::StartsWith()
+ //
+ // Determines whether the Cord starts with the passed string data `rhs`.
+ bool StartsWith(const Cord& rhs) const;
+ bool StartsWith(absl::string_view rhs) const;
+
+ // Cord::EndsWidth()
+ //
+ // Determines whether the Cord ends with the passed string data `rhs`.
+ bool EndsWith(absl::string_view rhs) const;
+ bool EndsWith(const Cord& rhs) const;
+
+ // Cord::operator std::string()
+ //
+ // Converts a Cord into a `std::string()`. This operator is marked explicit to
+ // prevent unintended Cord usage in functions that take a string.
+ explicit operator std::string() const;
+
+ // CopyCordToString()
+ //
+ // Copies the contents of a `src` Cord into a `*dst` string.
+ //
+ // This function optimizes the case of reusing the destination string since it
+ // can reuse previously allocated capacity. However, this function does not
+ // guarantee that pointers previously returned by `dst->data()` remain valid
+ // even if `*dst` had enough capacity to hold `src`. If `*dst` is a new
+ // object, prefer to simply use the conversion operator to `std::string`.
+ friend void CopyCordToString(const Cord& src, std::string* dst);
+
+ class CharIterator;
+
+ //----------------------------------------------------------------------------
+ // Cord::ChunkIterator
+ //----------------------------------------------------------------------------
+ //
+ // A `Cord::ChunkIterator` allows iteration over the constituent chunks of its
+ // Cord. Such iteration allows you to perform non-const operatons on the data
+ // of a Cord without modifying it.
+ //
+ // Generally, you do not instantiate a `Cord::ChunkIterator` directly;
+ // instead, you create one implicitly through use of the `Cord::Chunks()`
+ // member function.
+ //
+ // The `Cord::ChunkIterator` has the following properties:
+ //
+ // * The iterator is invalidated after any non-const operation on the
+ // Cord object over which it iterates.
+ // * The `string_view` returned by dereferencing a valid, non-`end()`
+ // iterator is guaranteed to be non-empty.
+ // * Two `ChunkIterator` objects can be compared equal if and only if they
+ // remain valid and iterate over the same Cord.
+ // * The iterator in this case is a proxy iterator; the `string_view`
+ // returned by the iterator does not live inside the Cord, and its
+ // lifetime is limited to the lifetime of the iterator itself. To help
+ // prevent lifetime issues, `ChunkIterator::reference` is not a true
+ // reference type and is equivalent to `value_type`.
+ // * The iterator keeps state that can grow for Cords that contain many
+ // nodes and are imbalanced due to sharing. Prefer to pass this type by
+ // const reference instead of by value.
+ class ChunkIterator {
+ public:
+ using iterator_category = std::input_iterator_tag;
+ using value_type = absl::string_view;
+ using difference_type = ptrdiff_t;
+ using pointer = const value_type*;
+ using reference = value_type;
+
+ ChunkIterator() = default;
+
+ ChunkIterator& operator++();
+ ChunkIterator operator++(int);
+ bool operator==(const ChunkIterator& other) const;
+ bool operator!=(const ChunkIterator& other) const;
+ reference operator*() const;
+ pointer operator->() const;
+
+ friend class Cord;
+ friend class CharIterator;
+
+ private:
+ // Constructs a `begin()` iterator from `cord`.
+ explicit ChunkIterator(const Cord* cord);
+
+ // Removes `n` bytes from `current_chunk_`. Expects `n` to be smaller than
+ // `current_chunk_.size()`.
+ void RemoveChunkPrefix(size_t n);
+ Cord AdvanceAndReadBytes(size_t n);
+ void AdvanceBytes(size_t n);
+ // Iterates `n` bytes, where `n` is expected to be greater than or equal to
+ // `current_chunk_.size()`.
+ void AdvanceBytesSlowPath(size_t n);
+
+ // A view into bytes of the current `CordRep`. It may only be a view to a
+ // suffix of bytes if this is being used by `CharIterator`.
+ absl::string_view current_chunk_;
+ // The current leaf, or `nullptr` if the iterator points to short data.
+ // If the current chunk is a substring node, current_leaf_ points to the
+ // underlying flat or external node.
+ absl::cord_internal::CordRep* current_leaf_ = nullptr;
+ // The number of bytes left in the `Cord` over which we are iterating.
+ size_t bytes_remaining_ = 0;
+ absl::InlinedVector<absl::cord_internal::CordRep*, 4>
+ stack_of_right_children_;
+ };
+
+ // Cord::ChunkIterator::chunk_begin()
+ //
+ // Returns an iterator to the first chunk of the `Cord`.
+ //
+ // Generally, prefer using `Cord::Chunks()` within a range-based for loop for
+ // iterating over the chunks of a Cord. This method may be useful for getting
+ // a `ChunkIterator` where range-based for-loops are not useful.
+ //
+ // Example:
+ //
+ // absl::Cord::ChunkIterator FindAsChunk(const absl::Cord& c,
+ // absl::string_view s) {
+ // return std::find(c.chunk_begin(), c.chunk_end(), s);
+ // }
+ ChunkIterator chunk_begin() const;
+
+ // Cord::ChunkItertator::chunk_end()
+ //
+ // Returns an iterator one increment past the last chunk of the `Cord`.
+ //
+ // Generally, prefer using `Cord::Chunks()` within a range-based for loop for
+ // iterating over the chunks of a Cord. This method may be useful for getting
+ // a `ChunkIterator` where range-based for-loops may not be available.
+ ChunkIterator chunk_end() const;
+
+ //----------------------------------------------------------------------------
+ // Cord::ChunkIterator::ChunkRange
+ //----------------------------------------------------------------------------
+ //
+ // `ChunkRange` is a helper class for iterating over the chunks of the `Cord`,
+ // producing an iterator which can be used within a range-based for loop.
+ // Construction of a `ChunkRange` will return an iterator pointing to the
+ // first chunk of the Cord. Generally, do not construct a `ChunkRange`
+ // directly; instead, prefer to use the `Cord::Chunks()` method.
+ //
+ // Implementation note: `ChunkRange` is simply a convenience wrapper over
+ // `Cord::chunk_begin()` and `Cord::chunk_end()`.
+ class ChunkRange {
+ public:
+ explicit ChunkRange(const Cord* cord) : cord_(cord) {}
+
+ ChunkIterator begin() const;
+ ChunkIterator end() const;
+
+ private:
+ const Cord* cord_;
+ };
+
+ // Cord::Chunks()
+ //
+ // Returns a `Cord::ChunkIterator::ChunkRange` for iterating over the chunks
+ // of a `Cord` with a range-based for-loop. For most iteration tasks on a
+ // Cord, use `Cord::Chunks()` to retrieve this iterator.
+ //
+ // Example:
+ //
+ // void ProcessChunks(const Cord& cord) {
+ // for (absl::string_view chunk : cord.Chunks()) { ... }
+ // }
+ //
+ // Note that the ordinary caveats of temporary lifetime extension apply:
+ //
+ // void Process() {
+ // for (absl::string_view chunk : CordFactory().Chunks()) {
+ // // The temporary Cord returned by CordFactory has been destroyed!
+ // }
+ // }
+ ChunkRange Chunks() const;
+
+ //----------------------------------------------------------------------------
+ // Cord::CharIterator
+ //----------------------------------------------------------------------------
+ //
+ // A `Cord::CharIterator` allows iteration over the constituent characters of
+ // a `Cord`.
+ //
+ // Generally, you do not instantiate a `Cord::CharIterator` directly; instead,
+ // you create one implicitly through use of the `Cord::Chars()` member
+ // function.
+ //
+ // A `Cord::CharIterator` has the following properties:
+ //
+ // * The iterator is invalidated after any non-const operation on the
+ // Cord object over which it iterates.
+ // * Two `CharIterator` objects can be compared equal if and only if they
+ // remain valid and iterate over the same Cord.
+ // * The iterator keeps state that can grow for Cords that contain many
+ // nodes and are imbalanced due to sharing. Prefer to pass this type by
+ // const reference instead of by value.
+ // * This type cannot act as a forward iterator because a `Cord` can reuse
+ // sections of memory. This fact violates the requirement for forward
+ // iterators to compare equal if dereferencing them returns the same
+ // object.
+ class CharIterator {
+ public:
+ using iterator_category = std::input_iterator_tag;
+ using value_type = char;
+ using difference_type = ptrdiff_t;
+ using pointer = const char*;
+ using reference = const char&;
+
+ CharIterator() = default;
+
+ CharIterator& operator++();
+ CharIterator operator++(int);
+ bool operator==(const CharIterator& other) const;
+ bool operator!=(const CharIterator& other) const;
+ reference operator*() const;
+ pointer operator->() const;
+
+ friend Cord;
+
+ private:
+ explicit CharIterator(const Cord* cord) : chunk_iterator_(cord) {}
+
+ ChunkIterator chunk_iterator_;
+ };
+
+ // Cord::CharIterator::AdvanceAndRead()
+ //
+ // Advances the `Cord::CharIterator` by `n_bytes` and returns the bytes
+ // advanced as a separate `Cord`. `n_bytes` must be less than or equal to the
+ // number of bytes within the Cord; otherwise, behavior is undefined. It is
+ // valid to pass `char_end()` and `0`.
+ static Cord AdvanceAndRead(CharIterator* it, size_t n_bytes);
+
+ // Cord::CharIterator::Advance()
+ //
+ // Advances the `Cord::CharIterator` by `n_bytes`. `n_bytes` must be less than
+ // or equal to the number of bytes remaining within the Cord; otherwise,
+ // behavior is undefined. It is valid to pass `char_end()` and `0`.
+ static void Advance(CharIterator* it, size_t n_bytes);
+
+ // Cord::CharIterator::ChunkRemaining()
+ //
+ // Returns the longest contiguous view starting at the iterator's position.
+ //
+ // `it` must be dereferenceable.
+ static absl::string_view ChunkRemaining(const CharIterator& it);
+
+ // Cord::CharIterator::char_begin()
+ //
+ // Returns an iterator to the first character of the `Cord`.
+ //
+ // Generally, prefer using `Cord::Chars()` within a range-based for loop for
+ // iterating over the chunks of a Cord. This method may be useful for getting
+ // a `CharIterator` where range-based for-loops may not be available.
+ CharIterator char_begin() const;
+
+ // Cord::CharIterator::char_end()
+ //
+ // Returns an iterator to one past the last character of the `Cord`.
+ //
+ // Generally, prefer using `Cord::Chars()` within a range-based for loop for
+ // iterating over the chunks of a Cord. This method may be useful for getting
+ // a `CharIterator` where range-based for-loops are not useful.
+ CharIterator char_end() const;
+
+ // Cord::CharIterator::CharRange
+ //
+ // `CharRange` is a helper class for iterating over the characters of a
+ // producing an iterator which can be used within a range-based for loop.
+ // Construction of a `CharRange` will return an iterator pointing to the first
+ // character of the Cord. Generally, do not construct a `CharRange` directly;
+ // instead, prefer to use the `Cord::Chars()` method show below.
+ //
+ // Implementation note: `CharRange` is simply a convenience wrapper over
+ // `Cord::char_begin()` and `Cord::char_end()`.
+ class CharRange {
+ public:
+ explicit CharRange(const Cord* cord) : cord_(cord) {}
+
+ CharIterator begin() const;
+ CharIterator end() const;
+
+ private:
+ const Cord* cord_;
+ };
+
+ // Cord::CharIterator::Chars()
+ //
+ // Returns a `Cord::CharIterator` for iterating over the characters of a
+ // `Cord` with a range-based for-loop. For most character-based iteration
+ // tasks on a Cord, use `Cord::Chars()` to retrieve this iterator.
+ //
+ // Example:
+ //
+ // void ProcessCord(const Cord& cord) {
+ // for (char c : cord.Chars()) { ... }
+ // }
+ //
+ // Note that the ordinary caveats of temporary lifetime extension apply:
+ //
+ // void Process() {
+ // for (char c : CordFactory().Chars()) {
+ // // The temporary Cord returned by CordFactory has been destroyed!
+ // }
+ // }
+ CharRange Chars() const;
+
+ // Cord::operator[]
+ //
+ // Gets the "i"th character of the Cord and returns it, provided that
+ // 0 <= i < Cord.size().
+ //
+ // NOTE: This routine is reasonably efficient. It is roughly
+ // logarithmic based on the number of chunks that make up the cord. Still,
+ // if you need to iterate over the contents of a cord, you should
+ // use a CharIterator/ChunkIterator rather than call operator[] or Get()
+ // repeatedly in a loop.
+ char operator[](size_t i) const;
+
+ // Cord::TryFlat()
+ //
+ // If this cord's representation is a single flat array, returns a
+ // string_view referencing that array. Otherwise returns nullopt.
+ absl::optional<absl::string_view> TryFlat() const;
+
+ // Cord::Flatten()
+ //
+ // Flattens the cord into a single array and returns a view of the data.
+ //
+ // If the cord was already flat, the contents are not modified.
+ absl::string_view Flatten();
+
+ // Supports absl::Cord as a sink object for absl::Format().
+ friend void AbslFormatFlush(absl::Cord* cord, absl::string_view part) {
+ cord->Append(part);
+ }
+
+ template <typename H>
+ friend H AbslHashValue(H hash_state, const absl::Cord& c) {
+ absl::optional<absl::string_view> maybe_flat = c.TryFlat();
+ if (maybe_flat.has_value()) {
+ return H::combine(std::move(hash_state), *maybe_flat);
+ }
+ return c.HashFragmented(std::move(hash_state));
+ }
+
+ // Create a Cord with the contents of StringConstant<T>::value.
+ // No allocations will be done and no data will be copied.
+ // This is an INTERNAL API and subject to change or removal. This API can only
+ // be used by spelling absl::strings_internal::MakeStringConstant, which is
+ // also an internal API.
+ template <typename T>
+ explicit constexpr Cord(strings_internal::StringConstant<T>);
+
+ private:
+ friend class CordTestPeer;
+ friend bool operator==(const Cord& lhs, const Cord& rhs);
+ friend bool operator==(const Cord& lhs, absl::string_view rhs);
+
+ // Calls the provided function once for each cord chunk, in order. Unlike
+ // Chunks(), this API will not allocate memory.
+ void ForEachChunk(absl::FunctionRef<void(absl::string_view)>) const;
+
+ // Allocates new contiguous storage for the contents of the cord. This is
+ // called by Flatten() when the cord was not already flat.
+ absl::string_view FlattenSlowPath();
+
+ // Actual cord contents are hidden inside the following simple
+ // class so that we can isolate the bulk of cord.cc from changes
+ // to the representation.
+ //
+ // InlineRep holds either a tree pointer, or an array of kMaxInline bytes.
+ class InlineRep {
+ public:
+ static constexpr unsigned char kMaxInline = cord_internal::kMaxInline;
+ static_assert(kMaxInline >= sizeof(absl::cord_internal::CordRep*), "");
+ static constexpr unsigned char kTreeFlag = cord_internal::kTreeFlag;
+ static constexpr unsigned char kProfiledFlag = cord_internal::kProfiledFlag;
+
+ constexpr InlineRep() : data_() {}
+ InlineRep(const InlineRep& src);
+ InlineRep(InlineRep&& src);
+ InlineRep& operator=(const InlineRep& src);
+ InlineRep& operator=(InlineRep&& src) noexcept;
+
+ explicit constexpr InlineRep(cord_internal::InlineData data);
+
+ void Swap(InlineRep* rhs);
+ bool empty() const;
+ size_t size() const;
+ const char* data() const; // Returns nullptr if holding pointer
+ void set_data(const char* data, size_t n,
+ bool nullify_tail); // Discards pointer, if any
+ char* set_data(size_t n); // Write data to the result
+ // Returns nullptr if holding bytes
+ absl::cord_internal::CordRep* tree() const;
+ // Discards old pointer, if any
+ void set_tree(absl::cord_internal::CordRep* rep);
+ // Replaces a tree with a new root. This is faster than set_tree, but it
+ // should only be used when it's clear that the old rep was a tree.
+ void replace_tree(absl::cord_internal::CordRep* rep);
+ // Returns non-null iff was holding a pointer
+ absl::cord_internal::CordRep* clear();
+ // Converts to pointer if necessary.
+ absl::cord_internal::CordRep* force_tree(size_t extra_hint);
+ void reduce_size(size_t n); // REQUIRES: holding data
+ void remove_prefix(size_t n); // REQUIRES: holding data
+ void AppendArray(const char* src_data, size_t src_size);
+ absl::string_view FindFlatStartPiece() const;
+ void AppendTree(absl::cord_internal::CordRep* tree);
+ void PrependTree(absl::cord_internal::CordRep* tree);
+ void GetAppendRegion(char** region, size_t* size, size_t max_length);
+ void GetAppendRegion(char** region, size_t* size);
+ bool IsSame(const InlineRep& other) const {
+ return memcmp(&data_, &other.data_, sizeof(data_)) == 0;
+ }
+ int BitwiseCompare(const InlineRep& other) const {
+ uint64_t x, y;
+ // Use memcpy to avoid aliasing issues.
+ memcpy(&x, &data_, sizeof(x));
+ memcpy(&y, &other.data_, sizeof(y));
+ if (x == y) {
+ memcpy(&x, reinterpret_cast<const char*>(&data_) + 8, sizeof(x));
+ memcpy(&y, reinterpret_cast<const char*>(&other.data_) + 8, sizeof(y));
+ if (x == y) return 0;
+ }
+ return absl::big_endian::FromHost64(x) < absl::big_endian::FromHost64(y)
+ ? -1
+ : 1;
+ }
+ void CopyTo(std::string* dst) const {
+ // memcpy is much faster when operating on a known size. On most supported
+ // platforms, the small string optimization is large enough that resizing
+ // to 15 bytes does not cause a memory allocation.
+ absl::strings_internal::STLStringResizeUninitialized(dst,
+ sizeof(data_) - 1);
+ memcpy(&(*dst)[0], &data_, sizeof(data_) - 1);
+ // erase is faster than resize because the logic for memory allocation is
+ // not needed.
+ dst->erase(tagged_size());
+ }
+
+ // Copies the inline contents into `dst`. Assumes the cord is not empty.
+ void CopyToArray(char* dst) const;
+
+ bool is_tree() const { return tagged_size() > kMaxInline; }
+
+ private:
+ friend class Cord;
+
+ void AssignSlow(const InlineRep& src);
+ // Unrefs the tree, stops profiling, and zeroes the contents
+ void ClearSlow();
+
+ void ResetToEmpty() { data_ = {}; }
+
+ // This uses reinterpret_cast instead of the union to avoid accessing the
+ // inactive union element. The tagged size is not a common prefix.
+ void set_tagged_size(char new_tag) {
+ reinterpret_cast<char*>(&data_)[kMaxInline] = new_tag;
+ }
+ char tagged_size() const {
+ return reinterpret_cast<const char*>(&data_)[kMaxInline];
+ }
+
+ cord_internal::InlineData data_;
+ };
+ InlineRep contents_;
+
+ // Helper for MemoryUsage().
+ static size_t MemoryUsageAux(const absl::cord_internal::CordRep* rep);
+
+ // Helper for GetFlat() and TryFlat().
+ static bool GetFlatAux(absl::cord_internal::CordRep* rep,
+ absl::string_view* fragment);
+
+ // Helper for ForEachChunk().
+ static void ForEachChunkAux(
+ absl::cord_internal::CordRep* rep,
+ absl::FunctionRef<void(absl::string_view)> callback);
+
+ // The destructor for non-empty Cords.
+ void DestroyCordSlow();
+
+ // Out-of-line implementation of slower parts of logic.
+ void CopyToArraySlowPath(char* dst) const;
+ int CompareSlowPath(absl::string_view rhs, size_t compared_size,
+ size_t size_to_compare) const;
+ int CompareSlowPath(const Cord& rhs, size_t compared_size,
+ size_t size_to_compare) const;
+ bool EqualsImpl(absl::string_view rhs, size_t size_to_compare) const;
+ bool EqualsImpl(const Cord& rhs, size_t size_to_compare) const;
+ int CompareImpl(const Cord& rhs) const;
+
+ template <typename ResultType, typename RHS>
+ friend ResultType GenericCompare(const Cord& lhs, const RHS& rhs,
+ size_t size_to_compare);
+ static absl::string_view GetFirstChunk(const Cord& c);
+ static absl::string_view GetFirstChunk(absl::string_view sv);
+
+ // Returns a new reference to contents_.tree(), or steals an existing
+ // reference if called on an rvalue.
+ absl::cord_internal::CordRep* TakeRep() const&;
+ absl::cord_internal::CordRep* TakeRep() &&;
+
+ // Helper for Append().
+ template <typename C>
+ void AppendImpl(C&& src);
+
+ // Helper for AbslHashValue().
+ template <typename H>
+ H HashFragmented(H hash_state) const {
+ typename H::AbslInternalPiecewiseCombiner combiner;
+ ForEachChunk([&combiner, &hash_state](absl::string_view chunk) {
+ hash_state = combiner.add_buffer(std::move(hash_state), chunk.data(),
+ chunk.size());
+ });
+ return H::combine(combiner.finalize(std::move(hash_state)), size());
+ }
+};
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+// allow a Cord to be logged
+extern std::ostream& operator<<(std::ostream& out, const Cord& cord);
+
+// ------------------------------------------------------------------
+// Internal details follow. Clients should ignore.
+
+namespace cord_internal {
+
+// Fast implementation of memmove for up to 15 bytes. This implementation is
+// safe for overlapping regions. If nullify_tail is true, the destination is
+// padded with '\0' up to 16 bytes.
+inline void SmallMemmove(char* dst, const char* src, size_t n,
+ bool nullify_tail = false) {
+ if (n >= 8) {
+ assert(n <= 16);
+ uint64_t buf1;
+ uint64_t buf2;
+ memcpy(&buf1, src, 8);
+ memcpy(&buf2, src + n - 8, 8);
+ if (nullify_tail) {
+ memset(dst + 8, 0, 8);
+ }
+ memcpy(dst, &buf1, 8);
+ memcpy(dst + n - 8, &buf2, 8);
+ } else if (n >= 4) {
+ uint32_t buf1;
+ uint32_t buf2;
+ memcpy(&buf1, src, 4);
+ memcpy(&buf2, src + n - 4, 4);
+ if (nullify_tail) {
+ memset(dst + 4, 0, 4);
+ memset(dst + 8, 0, 8);
+ }
+ memcpy(dst, &buf1, 4);
+ memcpy(dst + n - 4, &buf2, 4);
+ } else {
+ if (n != 0) {
+ dst[0] = src[0];
+ dst[n / 2] = src[n / 2];
+ dst[n - 1] = src[n - 1];
+ }
+ if (nullify_tail) {
+ memset(dst + 8, 0, 8);
+ memset(dst + n, 0, 8);
+ }
+ }
+}
+
+// Does non-template-specific `CordRepExternal` initialization.
+// Expects `data` to be non-empty.
+void InitializeCordRepExternal(absl::string_view data, CordRepExternal* rep);
+
+// Creates a new `CordRep` that owns `data` and `releaser` and returns a pointer
+// to it, or `nullptr` if `data` was empty.
+template <typename Releaser>
+// NOLINTNEXTLINE - suppress clang-tidy raw pointer return.
+CordRep* NewExternalRep(absl::string_view data, Releaser&& releaser) {
+ using ReleaserType = absl::decay_t<Releaser>;
+ if (data.empty()) {
+ // Never create empty external nodes.
+ InvokeReleaser(Rank0{}, ReleaserType(std::forward<Releaser>(releaser)),
+ data);
+ return nullptr;
+ }
+
+ CordRepExternal* rep = new CordRepExternalImpl<ReleaserType>(
+ std::forward<Releaser>(releaser), 0);
+ InitializeCordRepExternal(data, rep);
+ return rep;
+}
+
+// Overload for function reference types that dispatches using a function
+// pointer because there are no `alignof()` or `sizeof()` a function reference.
+// NOLINTNEXTLINE - suppress clang-tidy raw pointer return.
+inline CordRep* NewExternalRep(absl::string_view data,
+ void (&releaser)(absl::string_view)) {
+ return NewExternalRep(data, &releaser);
+}
+
+} // namespace cord_internal
+
+template <typename Releaser>
+Cord MakeCordFromExternal(absl::string_view data, Releaser&& releaser) {
+ Cord cord;
+ cord.contents_.set_tree(::absl::cord_internal::NewExternalRep(
+ data, std::forward<Releaser>(releaser)));
+ return cord;
+}
+
+constexpr Cord::InlineRep::InlineRep(cord_internal::InlineData data)
+ : data_(data) {}
+
+inline Cord::InlineRep::InlineRep(const Cord::InlineRep& src) {
+ data_ = src.data_;
+}
+
+inline Cord::InlineRep::InlineRep(Cord::InlineRep&& src) {
+ data_ = src.data_;
+ src.ResetToEmpty();
+}
+
+inline Cord::InlineRep& Cord::InlineRep::operator=(const Cord::InlineRep& src) {
+ if (this == &src) {
+ return *this;
+ }
+ if (!is_tree() && !src.is_tree()) {
+ data_ = src.data_;
+ return *this;
+ }
+ AssignSlow(src);
+ return *this;
+}
+
+inline Cord::InlineRep& Cord::InlineRep::operator=(
+ Cord::InlineRep&& src) noexcept {
+ if (is_tree()) {
+ ClearSlow();
+ }
+ data_ = src.data_;
+ src.ResetToEmpty();
+ return *this;
+}
+
+inline void Cord::InlineRep::Swap(Cord::InlineRep* rhs) {
+ if (rhs == this) {
+ return;
+ }
+
+ std::swap(data_, rhs->data_);
+}
+
+inline const char* Cord::InlineRep::data() const {
+ return is_tree() ? nullptr : data_.as_chars;
+}
+
+inline absl::cord_internal::CordRep* Cord::InlineRep::tree() const {
+ if (is_tree()) {
+ return data_.as_tree.rep;
+ } else {
+ return nullptr;
+ }
+}
+
+inline bool Cord::InlineRep::empty() const { return tagged_size() == 0; }
+
+inline size_t Cord::InlineRep::size() const {
+ const char tag = tagged_size();
+ if (tag <= kMaxInline) return tag;
+ return static_cast<size_t>(tree()->length);
+}
+
+inline void Cord::InlineRep::set_tree(absl::cord_internal::CordRep* rep) {
+ if (rep == nullptr) {
+ ResetToEmpty();
+ } else {
+ bool was_tree = is_tree();
+ data_.as_tree = {rep, {}, tagged_size()};
+ if (!was_tree) {
+ // If we were not a tree already, set the tag.
+ // Otherwise, leave it alone because it might have the profile bit on.
+ set_tagged_size(kTreeFlag);
+ }
+ }
+}
+
+inline void Cord::InlineRep::replace_tree(absl::cord_internal::CordRep* rep) {
+ ABSL_ASSERT(is_tree());
+ if (ABSL_PREDICT_FALSE(rep == nullptr)) {
+ set_tree(rep);
+ return;
+ }
+ data_.as_tree = {rep, {}, tagged_size()};
+}
+
+inline absl::cord_internal::CordRep* Cord::InlineRep::clear() {
+ absl::cord_internal::CordRep* result = tree();
+ ResetToEmpty();
+ return result;
+}
+
+inline void Cord::InlineRep::CopyToArray(char* dst) const {
+ assert(!is_tree());
+ size_t n = tagged_size();
+ assert(n != 0);
+ cord_internal::SmallMemmove(dst, data_.as_chars, n);
+}
+
+constexpr inline Cord::Cord() noexcept {}
+
+template <typename T>
+constexpr Cord::Cord(strings_internal::StringConstant<T>)
+ : contents_(strings_internal::StringConstant<T>::value.size() <=
+ cord_internal::kMaxInline
+ ? cord_internal::InlineData(
+ strings_internal::StringConstant<T>::value)
+ : cord_internal::InlineData(cord_internal::AsTree{
+ &cord_internal::ConstInitExternalStorage<
+ strings_internal::StringConstant<T>>::value,
+ {},
+ cord_internal::kTreeFlag})) {}
+
+inline Cord& Cord::operator=(const Cord& x) {
+ contents_ = x.contents_;
+ return *this;
+}
+
+inline Cord::Cord(Cord&& src) noexcept : contents_(std::move(src.contents_)) {}
+
+inline void Cord::swap(Cord& other) noexcept {
+ contents_.Swap(&other.contents_);
+}
+
+inline Cord& Cord::operator=(Cord&& x) noexcept {
+ contents_ = std::move(x.contents_);
+ return *this;
+}
+
+extern template Cord::Cord(std::string&& src);
+extern template Cord& Cord::operator=(std::string&& src);
+
+inline size_t Cord::size() const {
+ // Length is 1st field in str.rep_
+ return contents_.size();
+}
+
+inline bool Cord::empty() const { return contents_.empty(); }
+
+inline size_t Cord::EstimatedMemoryUsage() const {
+ size_t result = sizeof(Cord);
+ if (const absl::cord_internal::CordRep* rep = contents_.tree()) {
+ result += MemoryUsageAux(rep);
+ }
+ return result;
+}
+
+inline absl::optional<absl::string_view> Cord::TryFlat() const {
+ absl::cord_internal::CordRep* rep = contents_.tree();
+ if (rep == nullptr) {
+ return absl::string_view(contents_.data(), contents_.size());
+ }
+ absl::string_view fragment;
+ if (GetFlatAux(rep, &fragment)) {
+ return fragment;
+ }
+ return absl::nullopt;
+}
+
+inline absl::string_view Cord::Flatten() {
+ absl::cord_internal::CordRep* rep = contents_.tree();
+ if (rep == nullptr) {
+ return absl::string_view(contents_.data(), contents_.size());
+ } else {
+ absl::string_view already_flat_contents;
+ if (GetFlatAux(rep, &already_flat_contents)) {
+ return already_flat_contents;
+ }
+ }
+ return FlattenSlowPath();
+}
+
+inline void Cord::Append(absl::string_view src) {
+ contents_.AppendArray(src.data(), src.size());
+}
+
+extern template void Cord::Append(std::string&& src);
+extern template void Cord::Prepend(std::string&& src);
+
+inline int Cord::Compare(const Cord& rhs) const {
+ if (!contents_.is_tree() && !rhs.contents_.is_tree()) {
+ return contents_.BitwiseCompare(rhs.contents_);
+ }
+
+ return CompareImpl(rhs);
+}
+
+// Does 'this' cord start/end with rhs
+inline bool Cord::StartsWith(const Cord& rhs) const {
+ if (contents_.IsSame(rhs.contents_)) return true;
+ size_t rhs_size = rhs.size();
+ if (size() < rhs_size) return false;
+ return EqualsImpl(rhs, rhs_size);
+}
+
+inline bool Cord::StartsWith(absl::string_view rhs) const {
+ size_t rhs_size = rhs.size();
+ if (size() < rhs_size) return false;
+ return EqualsImpl(rhs, rhs_size);
+}
+
+inline Cord::ChunkIterator::ChunkIterator(const Cord* cord)
+ : bytes_remaining_(cord->size()) {
+ if (cord->empty()) return;
+ if (cord->contents_.is_tree()) {
+ stack_of_right_children_.push_back(cord->contents_.tree());
+ operator++();
+ } else {
+ current_chunk_ = absl::string_view(cord->contents_.data(), cord->size());
+ }
+}
+
+inline Cord::ChunkIterator Cord::ChunkIterator::operator++(int) {
+ ChunkIterator tmp(*this);
+ operator++();
+ return tmp;
+}
+
+inline bool Cord::ChunkIterator::operator==(const ChunkIterator& other) const {
+ return bytes_remaining_ == other.bytes_remaining_;
+}
+
+inline bool Cord::ChunkIterator::operator!=(const ChunkIterator& other) const {
+ return !(*this == other);
+}
+
+inline Cord::ChunkIterator::reference Cord::ChunkIterator::operator*() const {
+ ABSL_HARDENING_ASSERT(bytes_remaining_ != 0);
+ return current_chunk_;
+}
+
+inline Cord::ChunkIterator::pointer Cord::ChunkIterator::operator->() const {
+ ABSL_HARDENING_ASSERT(bytes_remaining_ != 0);
+ return ¤t_chunk_;
+}
+
+inline void Cord::ChunkIterator::RemoveChunkPrefix(size_t n) {
+ assert(n < current_chunk_.size());
+ current_chunk_.remove_prefix(n);
+ bytes_remaining_ -= n;
+}
+
+inline void Cord::ChunkIterator::AdvanceBytes(size_t n) {
+ if (ABSL_PREDICT_TRUE(n < current_chunk_.size())) {
+ RemoveChunkPrefix(n);
+ } else if (n != 0) {
+ AdvanceBytesSlowPath(n);
+ }
+}
+
+inline Cord::ChunkIterator Cord::chunk_begin() const {
+ return ChunkIterator(this);
+}
+
+inline Cord::ChunkIterator Cord::chunk_end() const { return ChunkIterator(); }
+
+inline Cord::ChunkIterator Cord::ChunkRange::begin() const {
+ return cord_->chunk_begin();
+}
+
+inline Cord::ChunkIterator Cord::ChunkRange::end() const {
+ return cord_->chunk_end();
+}
+
+inline Cord::ChunkRange Cord::Chunks() const { return ChunkRange(this); }
+
+inline Cord::CharIterator& Cord::CharIterator::operator++() {
+ if (ABSL_PREDICT_TRUE(chunk_iterator_->size() > 1)) {
+ chunk_iterator_.RemoveChunkPrefix(1);
+ } else {
+ ++chunk_iterator_;
+ }
+ return *this;
+}
+
+inline Cord::CharIterator Cord::CharIterator::operator++(int) {
+ CharIterator tmp(*this);
+ operator++();
+ return tmp;
+}
+
+inline bool Cord::CharIterator::operator==(const CharIterator& other) const {
+ return chunk_iterator_ == other.chunk_iterator_;
+}
+
+inline bool Cord::CharIterator::operator!=(const CharIterator& other) const {
+ return !(*this == other);
+}
+
+inline Cord::CharIterator::reference Cord::CharIterator::operator*() const {
+ return *chunk_iterator_->data();
+}
+
+inline Cord::CharIterator::pointer Cord::CharIterator::operator->() const {
+ return chunk_iterator_->data();
+}
+
+inline Cord Cord::AdvanceAndRead(CharIterator* it, size_t n_bytes) {
+ assert(it != nullptr);
+ return it->chunk_iterator_.AdvanceAndReadBytes(n_bytes);
+}
+
+inline void Cord::Advance(CharIterator* it, size_t n_bytes) {
+ assert(it != nullptr);
+ it->chunk_iterator_.AdvanceBytes(n_bytes);
+}
+
+inline absl::string_view Cord::ChunkRemaining(const CharIterator& it) {
+ return *it.chunk_iterator_;
+}
+
+inline Cord::CharIterator Cord::char_begin() const {
+ return CharIterator(this);
+}
+
+inline Cord::CharIterator Cord::char_end() const { return CharIterator(); }
+
+inline Cord::CharIterator Cord::CharRange::begin() const {
+ return cord_->char_begin();
+}
+
+inline Cord::CharIterator Cord::CharRange::end() const {
+ return cord_->char_end();
+}
+
+inline Cord::CharRange Cord::Chars() const { return CharRange(this); }
+
+inline void Cord::ForEachChunk(
+ absl::FunctionRef<void(absl::string_view)> callback) const {
+ absl::cord_internal::CordRep* rep = contents_.tree();
+ if (rep == nullptr) {
+ callback(absl::string_view(contents_.data(), contents_.size()));
+ } else {
+ return ForEachChunkAux(rep, callback);
+ }
+}
+
+// Nonmember Cord-to-Cord relational operarators.
+inline bool operator==(const Cord& lhs, const Cord& rhs) {
+ if (lhs.contents_.IsSame(rhs.contents_)) return true;
+ size_t rhs_size = rhs.size();
+ if (lhs.size() != rhs_size) return false;
+ return lhs.EqualsImpl(rhs, rhs_size);
+}
+
+inline bool operator!=(const Cord& x, const Cord& y) { return !(x == y); }
+inline bool operator<(const Cord& x, const Cord& y) {
+ return x.Compare(y) < 0;
+}
+inline bool operator>(const Cord& x, const Cord& y) {
+ return x.Compare(y) > 0;
+}
+inline bool operator<=(const Cord& x, const Cord& y) {
+ return x.Compare(y) <= 0;
+}
+inline bool operator>=(const Cord& x, const Cord& y) {
+ return x.Compare(y) >= 0;
+}
+
+// Nonmember Cord-to-absl::string_view relational operators.
+//
+// Due to implicit conversions, these also enable comparisons of Cord with
+// with std::string, ::string, and const char*.
+inline bool operator==(const Cord& lhs, absl::string_view rhs) {
+ size_t lhs_size = lhs.size();
+ size_t rhs_size = rhs.size();
+ if (lhs_size != rhs_size) return false;
+ return lhs.EqualsImpl(rhs, rhs_size);
+}
+
+inline bool operator==(absl::string_view x, const Cord& y) { return y == x; }
+inline bool operator!=(const Cord& x, absl::string_view y) { return !(x == y); }
+inline bool operator!=(absl::string_view x, const Cord& y) { return !(x == y); }
+inline bool operator<(const Cord& x, absl::string_view y) {
+ return x.Compare(y) < 0;
+}
+inline bool operator<(absl::string_view x, const Cord& y) {
+ return y.Compare(x) > 0;
+}
+inline bool operator>(const Cord& x, absl::string_view y) { return y < x; }
+inline bool operator>(absl::string_view x, const Cord& y) { return y < x; }
+inline bool operator<=(const Cord& x, absl::string_view y) { return !(y < x); }
+inline bool operator<=(absl::string_view x, const Cord& y) { return !(y < x); }
+inline bool operator>=(const Cord& x, absl::string_view y) { return !(x < y); }
+inline bool operator>=(absl::string_view x, const Cord& y) { return !(x < y); }
+
+// Some internals exposed to test code.
+namespace strings_internal {
+class CordTestAccess {
+ public:
+ static size_t FlatOverhead();
+ static size_t MaxFlatLength();
+ static size_t SizeofCordRepConcat();
+ static size_t SizeofCordRepExternal();
+ static size_t SizeofCordRepSubstring();
+ static size_t FlatTagToLength(uint8_t tag);
+ static uint8_t LengthToTag(size_t s);
+};
+} // namespace strings_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_STRINGS_CORD_H_
diff --git a/third_party/abseil/src/absl/strings/cord_test.cc b/third_party/abseil/src/absl/strings/cord_test.cc
new file mode 100644
index 0000000..7942bfc
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/cord_test.cc
@@ -0,0 +1,1711 @@
+// Copyright 2020 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/strings/cord.h"
+
+#include <algorithm>
+#include <climits>
+#include <cstdio>
+#include <iterator>
+#include <map>
+#include <numeric>
+#include <random>
+#include <sstream>
+#include <type_traits>
+#include <utility>
+#include <vector>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/base/casts.h"
+#include "absl/base/config.h"
+#include "absl/base/internal/endian.h"
+#include "absl/base/internal/raw_logging.h"
+#include "absl/base/macros.h"
+#include "absl/container/fixed_array.h"
+#include "absl/strings/cord_test_helpers.h"
+#include "absl/strings/str_cat.h"
+#include "absl/strings/str_format.h"
+#include "absl/strings/string_view.h"
+
+typedef std::mt19937_64 RandomEngine;
+
+static std::string RandomLowercaseString(RandomEngine* rng);
+static std::string RandomLowercaseString(RandomEngine* rng, size_t length);
+
+static int GetUniformRandomUpTo(RandomEngine* rng, int upper_bound) {
+ if (upper_bound > 0) {
+ std::uniform_int_distribution<int> uniform(0, upper_bound - 1);
+ return uniform(*rng);
+ } else {
+ return 0;
+ }
+}
+
+static size_t GetUniformRandomUpTo(RandomEngine* rng, size_t upper_bound) {
+ if (upper_bound > 0) {
+ std::uniform_int_distribution<size_t> uniform(0, upper_bound - 1);
+ return uniform(*rng);
+ } else {
+ return 0;
+ }
+}
+
+static int32_t GenerateSkewedRandom(RandomEngine* rng, int max_log) {
+ const uint32_t base = (*rng)() % (max_log + 1);
+ const uint32_t mask = ((base < 32) ? (1u << base) : 0u) - 1u;
+ return (*rng)() & mask;
+}
+
+static std::string RandomLowercaseString(RandomEngine* rng) {
+ int length;
+ std::bernoulli_distribution one_in_1k(0.001);
+ std::bernoulli_distribution one_in_10k(0.0001);
+ // With low probability, make a large fragment
+ if (one_in_10k(*rng)) {
+ length = GetUniformRandomUpTo(rng, 1048576);
+ } else if (one_in_1k(*rng)) {
+ length = GetUniformRandomUpTo(rng, 10000);
+ } else {
+ length = GenerateSkewedRandom(rng, 10);
+ }
+ return RandomLowercaseString(rng, length);
+}
+
+static std::string RandomLowercaseString(RandomEngine* rng, size_t length) {
+ std::string result(length, '\0');
+ std::uniform_int_distribution<int> chars('a', 'z');
+ std::generate(result.begin(), result.end(),
+ [&]() { return static_cast<char>(chars(*rng)); });
+ return result;
+}
+
+static void DoNothing(absl::string_view /* data */, void* /* arg */) {}
+
+static void DeleteExternalString(absl::string_view data, void* arg) {
+ std::string* s = reinterpret_cast<std::string*>(arg);
+ EXPECT_EQ(data, *s);
+ delete s;
+}
+
+// Add "s" to *dst via `MakeCordFromExternal`
+static void AddExternalMemory(absl::string_view s, absl::Cord* dst) {
+ std::string* str = new std::string(s.data(), s.size());
+ dst->Append(absl::MakeCordFromExternal(*str, [str](absl::string_view data) {
+ DeleteExternalString(data, str);
+ }));
+}
+
+static void DumpGrowth() {
+ absl::Cord str;
+ for (int i = 0; i < 1000; i++) {
+ char c = 'a' + i % 26;
+ str.Append(absl::string_view(&c, 1));
+ }
+}
+
+// Make a Cord with some number of fragments. Return the size (in bytes)
+// of the smallest fragment.
+static size_t AppendWithFragments(const std::string& s, RandomEngine* rng,
+ absl::Cord* cord) {
+ size_t j = 0;
+ const size_t max_size = s.size() / 5; // Make approx. 10 fragments
+ size_t min_size = max_size; // size of smallest fragment
+ while (j < s.size()) {
+ size_t N = 1 + GetUniformRandomUpTo(rng, max_size);
+ if (N > (s.size() - j)) {
+ N = s.size() - j;
+ }
+ if (N < min_size) {
+ min_size = N;
+ }
+
+ std::bernoulli_distribution coin_flip(0.5);
+ if (coin_flip(*rng)) {
+ // Grow by adding an external-memory.
+ AddExternalMemory(absl::string_view(s.data() + j, N), cord);
+ } else {
+ cord->Append(absl::string_view(s.data() + j, N));
+ }
+ j += N;
+ }
+ return min_size;
+}
+
+// Add an external memory that contains the specified std::string to cord
+static void AddNewStringBlock(const std::string& str, absl::Cord* dst) {
+ char* data = new char[str.size()];
+ memcpy(data, str.data(), str.size());
+ dst->Append(absl::MakeCordFromExternal(
+ absl::string_view(data, str.size()),
+ [](absl::string_view s) { delete[] s.data(); }));
+}
+
+// Make a Cord out of many different types of nodes.
+static absl::Cord MakeComposite() {
+ absl::Cord cord;
+ cord.Append("the");
+ AddExternalMemory(" quick brown", &cord);
+ AddExternalMemory(" fox jumped", &cord);
+
+ absl::Cord full(" over");
+ AddExternalMemory(" the lazy", &full);
+ AddNewStringBlock(" dog slept the whole day away", &full);
+ absl::Cord substring = full.Subcord(0, 18);
+
+ // Make substring long enough to defeat the copying fast path in Append.
+ substring.Append(std::string(1000, '.'));
+ cord.Append(substring);
+ cord = cord.Subcord(0, cord.size() - 998); // Remove most of extra junk
+
+ return cord;
+}
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+class CordTestPeer {
+ public:
+ static void ForEachChunk(
+ const Cord& c, absl::FunctionRef<void(absl::string_view)> callback) {
+ c.ForEachChunk(callback);
+ }
+
+ static bool IsTree(const Cord& c) { return c.contents_.is_tree(); }
+};
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+TEST(Cord, AllFlatSizes) {
+ using absl::strings_internal::CordTestAccess;
+
+ for (size_t s = 0; s < CordTestAccess::MaxFlatLength(); s++) {
+ // Make a string of length s.
+ std::string src;
+ while (src.size() < s) {
+ src.push_back('a' + (src.size() % 26));
+ }
+
+ absl::Cord dst(src);
+ EXPECT_EQ(std::string(dst), src) << s;
+ }
+}
+
+// We create a Cord at least 128GB in size using the fact that Cords can
+// internally reference-count; thus the Cord is enormous without actually
+// consuming very much memory.
+TEST(GigabyteCord, FromExternal) {
+ const size_t one_gig = 1024U * 1024U * 1024U;
+ size_t max_size = 2 * one_gig;
+ if (sizeof(max_size) > 4) max_size = 128 * one_gig;
+
+ size_t length = 128 * 1024;
+ char* data = new char[length];
+ absl::Cord from = absl::MakeCordFromExternal(
+ absl::string_view(data, length),
+ [](absl::string_view sv) { delete[] sv.data(); });
+
+ // This loop may seem odd due to its combination of exponential doubling of
+ // size and incremental size increases. We do it incrementally to be sure the
+ // Cord will need rebalancing and will exercise code that, in the past, has
+ // caused crashes in production. We grow exponentially so that the code will
+ // execute in a reasonable amount of time.
+ absl::Cord c;
+ ABSL_RAW_LOG(INFO, "Made a Cord with %zu bytes!", c.size());
+ c.Append(from);
+ while (c.size() < max_size) {
+ c.Append(c);
+ c.Append(from);
+ c.Append(from);
+ c.Append(from);
+ c.Append(from);
+ }
+
+ for (int i = 0; i < 1024; ++i) {
+ c.Append(from);
+ }
+ ABSL_RAW_LOG(INFO, "Made a Cord with %zu bytes!", c.size());
+ // Note: on a 32-bit build, this comes out to 2,818,048,000 bytes.
+ // Note: on a 64-bit build, this comes out to 171,932,385,280 bytes.
+}
+
+static absl::Cord MakeExternalCord(int size) {
+ char* buffer = new char[size];
+ memset(buffer, 'x', size);
+ absl::Cord cord;
+ cord.Append(absl::MakeCordFromExternal(
+ absl::string_view(buffer, size),
+ [](absl::string_view s) { delete[] s.data(); }));
+ return cord;
+}
+
+// Extern to fool clang that this is not constant. Needed to suppress
+// a warning of unsafe code we want to test.
+extern bool my_unique_true_boolean;
+bool my_unique_true_boolean = true;
+
+TEST(Cord, Assignment) {
+ absl::Cord x(absl::string_view("hi there"));
+ absl::Cord y(x);
+ ASSERT_EQ(std::string(x), "hi there");
+ ASSERT_EQ(std::string(y), "hi there");
+ ASSERT_TRUE(x == y);
+ ASSERT_TRUE(x <= y);
+ ASSERT_TRUE(y <= x);
+
+ x = absl::string_view("foo");
+ ASSERT_EQ(std::string(x), "foo");
+ ASSERT_EQ(std::string(y), "hi there");
+ ASSERT_TRUE(x < y);
+ ASSERT_TRUE(y > x);
+ ASSERT_TRUE(x != y);
+ ASSERT_TRUE(x <= y);
+ ASSERT_TRUE(y >= x);
+
+ x = "foo";
+ ASSERT_EQ(x, "foo");
+
+ // Test that going from inline rep to tree we don't leak memory.
+ std::vector<std::pair<absl::string_view, absl::string_view>>
+ test_string_pairs = {{"hi there", "foo"},
+ {"loooooong coooooord", "short cord"},
+ {"short cord", "loooooong coooooord"},
+ {"loooooong coooooord1", "loooooong coooooord2"}};
+ for (std::pair<absl::string_view, absl::string_view> test_strings :
+ test_string_pairs) {
+ absl::Cord tmp(test_strings.first);
+ absl::Cord z(std::move(tmp));
+ ASSERT_EQ(std::string(z), test_strings.first);
+ tmp = test_strings.second;
+ z = std::move(tmp);
+ ASSERT_EQ(std::string(z), test_strings.second);
+ }
+ {
+ // Test that self-move assignment doesn't crash/leak.
+ // Do not write such code!
+ absl::Cord my_small_cord("foo");
+ absl::Cord my_big_cord("loooooong coooooord");
+ // Bypass clang's warning on self move-assignment.
+ absl::Cord* my_small_alias =
+ my_unique_true_boolean ? &my_small_cord : &my_big_cord;
+ absl::Cord* my_big_alias =
+ !my_unique_true_boolean ? &my_small_cord : &my_big_cord;
+
+ *my_small_alias = std::move(my_small_cord);
+ *my_big_alias = std::move(my_big_cord);
+ // my_small_cord and my_big_cord are in an unspecified but valid
+ // state, and will be correctly destroyed here.
+ }
+}
+
+TEST(Cord, StartsEndsWith) {
+ absl::Cord x(absl::string_view("abcde"));
+ absl::Cord empty("");
+
+ ASSERT_TRUE(x.StartsWith(absl::Cord("abcde")));
+ ASSERT_TRUE(x.StartsWith(absl::Cord("abc")));
+ ASSERT_TRUE(x.StartsWith(absl::Cord("")));
+ ASSERT_TRUE(empty.StartsWith(absl::Cord("")));
+ ASSERT_TRUE(x.EndsWith(absl::Cord("abcde")));
+ ASSERT_TRUE(x.EndsWith(absl::Cord("cde")));
+ ASSERT_TRUE(x.EndsWith(absl::Cord("")));
+ ASSERT_TRUE(empty.EndsWith(absl::Cord("")));
+
+ ASSERT_TRUE(!x.StartsWith(absl::Cord("xyz")));
+ ASSERT_TRUE(!empty.StartsWith(absl::Cord("xyz")));
+ ASSERT_TRUE(!x.EndsWith(absl::Cord("xyz")));
+ ASSERT_TRUE(!empty.EndsWith(absl::Cord("xyz")));
+
+ ASSERT_TRUE(x.StartsWith("abcde"));
+ ASSERT_TRUE(x.StartsWith("abc"));
+ ASSERT_TRUE(x.StartsWith(""));
+ ASSERT_TRUE(empty.StartsWith(""));
+ ASSERT_TRUE(x.EndsWith("abcde"));
+ ASSERT_TRUE(x.EndsWith("cde"));
+ ASSERT_TRUE(x.EndsWith(""));
+ ASSERT_TRUE(empty.EndsWith(""));
+
+ ASSERT_TRUE(!x.StartsWith("xyz"));
+ ASSERT_TRUE(!empty.StartsWith("xyz"));
+ ASSERT_TRUE(!x.EndsWith("xyz"));
+ ASSERT_TRUE(!empty.EndsWith("xyz"));
+}
+
+TEST(Cord, Subcord) {
+ RandomEngine rng(testing::GTEST_FLAG(random_seed));
+ const std::string s = RandomLowercaseString(&rng, 1024);
+
+ absl::Cord a;
+ AppendWithFragments(s, &rng, &a);
+ ASSERT_EQ(s.size(), a.size());
+
+ // Check subcords of a, from a variety of interesting points.
+ std::set<size_t> positions;
+ for (int i = 0; i <= 32; ++i) {
+ positions.insert(i);
+ positions.insert(i * 32 - 1);
+ positions.insert(i * 32);
+ positions.insert(i * 32 + 1);
+ positions.insert(a.size() - i);
+ }
+ positions.insert(237);
+ positions.insert(732);
+ for (size_t pos : positions) {
+ if (pos > a.size()) continue;
+ for (size_t end_pos : positions) {
+ if (end_pos < pos || end_pos > a.size()) continue;
+ absl::Cord sa = a.Subcord(pos, end_pos - pos);
+ EXPECT_EQ(absl::string_view(s).substr(pos, end_pos - pos),
+ std::string(sa))
+ << a;
+ }
+ }
+
+ // Do the same thing for an inline cord.
+ const std::string sh = "short";
+ absl::Cord c(sh);
+ for (size_t pos = 0; pos <= sh.size(); ++pos) {
+ for (size_t n = 0; n <= sh.size() - pos; ++n) {
+ absl::Cord sc = c.Subcord(pos, n);
+ EXPECT_EQ(sh.substr(pos, n), std::string(sc)) << c;
+ }
+ }
+
+ // Check subcords of subcords.
+ absl::Cord sa = a.Subcord(0, a.size());
+ std::string ss = s.substr(0, s.size());
+ while (sa.size() > 1) {
+ sa = sa.Subcord(1, sa.size() - 2);
+ ss = ss.substr(1, ss.size() - 2);
+ EXPECT_EQ(ss, std::string(sa)) << a;
+ if (HasFailure()) break; // halt cascade
+ }
+
+ // It is OK to ask for too much.
+ sa = a.Subcord(0, a.size() + 1);
+ EXPECT_EQ(s, std::string(sa));
+
+ // It is OK to ask for something beyond the end.
+ sa = a.Subcord(a.size() + 1, 0);
+ EXPECT_TRUE(sa.empty());
+ sa = a.Subcord(a.size() + 1, 1);
+ EXPECT_TRUE(sa.empty());
+}
+
+TEST(Cord, Swap) {
+ absl::string_view a("Dexter");
+ absl::string_view b("Mandark");
+ absl::Cord x(a);
+ absl::Cord y(b);
+ swap(x, y);
+ ASSERT_EQ(x, absl::Cord(b));
+ ASSERT_EQ(y, absl::Cord(a));
+ x.swap(y);
+ ASSERT_EQ(x, absl::Cord(a));
+ ASSERT_EQ(y, absl::Cord(b));
+}
+
+static void VerifyCopyToString(const absl::Cord& cord) {
+ std::string initially_empty;
+ absl::CopyCordToString(cord, &initially_empty);
+ EXPECT_EQ(initially_empty, cord);
+
+ constexpr size_t kInitialLength = 1024;
+ std::string has_initial_contents(kInitialLength, 'x');
+ const char* address_before_copy = has_initial_contents.data();
+ absl::CopyCordToString(cord, &has_initial_contents);
+ EXPECT_EQ(has_initial_contents, cord);
+
+ if (cord.size() <= kInitialLength) {
+ EXPECT_EQ(has_initial_contents.data(), address_before_copy)
+ << "CopyCordToString allocated new string storage; "
+ "has_initial_contents = \""
+ << has_initial_contents << "\"";
+ }
+}
+
+TEST(Cord, CopyToString) {
+ VerifyCopyToString(absl::Cord());
+ VerifyCopyToString(absl::Cord("small cord"));
+ VerifyCopyToString(
+ absl::MakeFragmentedCord({"fragmented ", "cord ", "to ", "test ",
+ "copying ", "to ", "a ", "string."}));
+}
+
+TEST(TryFlat, Empty) {
+ absl::Cord c;
+ EXPECT_EQ(c.TryFlat(), "");
+}
+
+TEST(TryFlat, Flat) {
+ absl::Cord c("hello");
+ EXPECT_EQ(c.TryFlat(), "hello");
+}
+
+TEST(TryFlat, SubstrInlined) {
+ absl::Cord c("hello");
+ c.RemovePrefix(1);
+ EXPECT_EQ(c.TryFlat(), "ello");
+}
+
+TEST(TryFlat, SubstrFlat) {
+ absl::Cord c("longer than 15 bytes");
+ c.RemovePrefix(1);
+ EXPECT_EQ(c.TryFlat(), "onger than 15 bytes");
+}
+
+TEST(TryFlat, Concat) {
+ absl::Cord c = absl::MakeFragmentedCord({"hel", "lo"});
+ EXPECT_EQ(c.TryFlat(), absl::nullopt);
+}
+
+TEST(TryFlat, External) {
+ absl::Cord c = absl::MakeCordFromExternal("hell", [](absl::string_view) {});
+ EXPECT_EQ(c.TryFlat(), "hell");
+}
+
+TEST(TryFlat, SubstrExternal) {
+ absl::Cord c = absl::MakeCordFromExternal("hell", [](absl::string_view) {});
+ c.RemovePrefix(1);
+ EXPECT_EQ(c.TryFlat(), "ell");
+}
+
+TEST(TryFlat, SubstrConcat) {
+ absl::Cord c = absl::MakeFragmentedCord({"hello", " world"});
+ c.RemovePrefix(1);
+ EXPECT_EQ(c.TryFlat(), absl::nullopt);
+}
+
+static bool IsFlat(const absl::Cord& c) {
+ return c.chunk_begin() == c.chunk_end() || ++c.chunk_begin() == c.chunk_end();
+}
+
+static void VerifyFlatten(absl::Cord c) {
+ std::string old_contents(c);
+ absl::string_view old_flat;
+ bool already_flat_and_non_empty = IsFlat(c) && !c.empty();
+ if (already_flat_and_non_empty) {
+ old_flat = *c.chunk_begin();
+ }
+ absl::string_view new_flat = c.Flatten();
+
+ // Verify that the contents of the flattened Cord are correct.
+ EXPECT_EQ(new_flat, old_contents);
+ EXPECT_EQ(std::string(c), old_contents);
+
+ // If the Cord contained data and was already flat, verify that the data
+ // wasn't copied.
+ if (already_flat_and_non_empty) {
+ EXPECT_EQ(old_flat.data(), new_flat.data())
+ << "Allocated new memory even though the Cord was already flat.";
+ }
+
+ // Verify that the flattened Cord is in fact flat.
+ EXPECT_TRUE(IsFlat(c));
+}
+
+TEST(Cord, Flatten) {
+ VerifyFlatten(absl::Cord());
+ VerifyFlatten(absl::Cord("small cord"));
+ VerifyFlatten(absl::Cord("larger than small buffer optimization"));
+ VerifyFlatten(absl::MakeFragmentedCord({"small ", "fragmented ", "cord"}));
+
+ // Test with a cord that is longer than the largest flat buffer
+ RandomEngine rng(testing::GTEST_FLAG(random_seed));
+ VerifyFlatten(absl::Cord(RandomLowercaseString(&rng, 8192)));
+}
+
+// Test data
+namespace {
+class TestData {
+ private:
+ std::vector<std::string> data_;
+
+ // Return a std::string of the specified length.
+ static std::string MakeString(int length) {
+ std::string result;
+ char buf[30];
+ snprintf(buf, sizeof(buf), "(%d)", length);
+ while (result.size() < length) {
+ result += buf;
+ }
+ result.resize(length);
+ return result;
+ }
+
+ public:
+ TestData() {
+ // short strings increasing in length by one
+ for (int i = 0; i < 30; i++) {
+ data_.push_back(MakeString(i));
+ }
+
+ // strings around half kMaxFlatLength
+ static const int kMaxFlatLength = 4096 - 9;
+ static const int kHalf = kMaxFlatLength / 2;
+
+ for (int i = -10; i <= +10; i++) {
+ data_.push_back(MakeString(kHalf + i));
+ }
+
+ for (int i = -10; i <= +10; i++) {
+ data_.push_back(MakeString(kMaxFlatLength + i));
+ }
+ }
+
+ size_t size() const { return data_.size(); }
+ const std::string& data(size_t i) const { return data_[i]; }
+};
+} // namespace
+
+TEST(Cord, MultipleLengths) {
+ TestData d;
+ for (size_t i = 0; i < d.size(); i++) {
+ std::string a = d.data(i);
+
+ { // Construct from Cord
+ absl::Cord tmp(a);
+ absl::Cord x(tmp);
+ EXPECT_EQ(a, std::string(x)) << "'" << a << "'";
+ }
+
+ { // Construct from absl::string_view
+ absl::Cord x(a);
+ EXPECT_EQ(a, std::string(x)) << "'" << a << "'";
+ }
+
+ { // Append cord to self
+ absl::Cord self(a);
+ self.Append(self);
+ EXPECT_EQ(a + a, std::string(self)) << "'" << a << "' + '" << a << "'";
+ }
+
+ { // Prepend cord to self
+ absl::Cord self(a);
+ self.Prepend(self);
+ EXPECT_EQ(a + a, std::string(self)) << "'" << a << "' + '" << a << "'";
+ }
+
+ // Try to append/prepend others
+ for (size_t j = 0; j < d.size(); j++) {
+ std::string b = d.data(j);
+
+ { // CopyFrom Cord
+ absl::Cord x(a);
+ absl::Cord y(b);
+ x = y;
+ EXPECT_EQ(b, std::string(x)) << "'" << a << "' + '" << b << "'";
+ }
+
+ { // CopyFrom absl::string_view
+ absl::Cord x(a);
+ x = b;
+ EXPECT_EQ(b, std::string(x)) << "'" << a << "' + '" << b << "'";
+ }
+
+ { // Cord::Append(Cord)
+ absl::Cord x(a);
+ absl::Cord y(b);
+ x.Append(y);
+ EXPECT_EQ(a + b, std::string(x)) << "'" << a << "' + '" << b << "'";
+ }
+
+ { // Cord::Append(absl::string_view)
+ absl::Cord x(a);
+ x.Append(b);
+ EXPECT_EQ(a + b, std::string(x)) << "'" << a << "' + '" << b << "'";
+ }
+
+ { // Cord::Prepend(Cord)
+ absl::Cord x(a);
+ absl::Cord y(b);
+ x.Prepend(y);
+ EXPECT_EQ(b + a, std::string(x)) << "'" << b << "' + '" << a << "'";
+ }
+
+ { // Cord::Prepend(absl::string_view)
+ absl::Cord x(a);
+ x.Prepend(b);
+ EXPECT_EQ(b + a, std::string(x)) << "'" << b << "' + '" << a << "'";
+ }
+ }
+ }
+}
+
+namespace {
+
+TEST(Cord, RemoveSuffixWithExternalOrSubstring) {
+ absl::Cord cord = absl::MakeCordFromExternal(
+ "foo bar baz", [](absl::string_view s) { DoNothing(s, nullptr); });
+
+ EXPECT_EQ("foo bar baz", std::string(cord));
+
+ // This RemoveSuffix() will wrap the EXTERNAL node in a SUBSTRING node.
+ cord.RemoveSuffix(4);
+ EXPECT_EQ("foo bar", std::string(cord));
+
+ // This RemoveSuffix() will adjust the SUBSTRING node in-place.
+ cord.RemoveSuffix(4);
+ EXPECT_EQ("foo", std::string(cord));
+}
+
+TEST(Cord, RemoveSuffixMakesZeroLengthNode) {
+ absl::Cord c;
+ c.Append(absl::Cord(std::string(100, 'x')));
+ absl::Cord other_ref = c; // Prevent inplace appends
+ c.Append(absl::Cord(std::string(200, 'y')));
+ c.RemoveSuffix(200);
+ EXPECT_EQ(std::string(100, 'x'), std::string(c));
+}
+
+} // namespace
+
+// CordSpliceTest contributed by hendrie.
+namespace {
+
+// Create a cord with an external memory block filled with 'z'
+absl::Cord CordWithZedBlock(size_t size) {
+ char* data = new char[size];
+ if (size > 0) {
+ memset(data, 'z', size);
+ }
+ absl::Cord cord = absl::MakeCordFromExternal(
+ absl::string_view(data, size),
+ [](absl::string_view s) { delete[] s.data(); });
+ return cord;
+}
+
+// Establish that ZedBlock does what we think it does.
+TEST(CordSpliceTest, ZedBlock) {
+ absl::Cord blob = CordWithZedBlock(10);
+ EXPECT_EQ(10, blob.size());
+ std::string s;
+ absl::CopyCordToString(blob, &s);
+ EXPECT_EQ("zzzzzzzzzz", s);
+}
+
+TEST(CordSpliceTest, ZedBlock0) {
+ absl::Cord blob = CordWithZedBlock(0);
+ EXPECT_EQ(0, blob.size());
+ std::string s;
+ absl::CopyCordToString(blob, &s);
+ EXPECT_EQ("", s);
+}
+
+TEST(CordSpliceTest, ZedBlockSuffix1) {
+ absl::Cord blob = CordWithZedBlock(10);
+ EXPECT_EQ(10, blob.size());
+ absl::Cord suffix(blob);
+ suffix.RemovePrefix(9);
+ EXPECT_EQ(1, suffix.size());
+ std::string s;
+ absl::CopyCordToString(suffix, &s);
+ EXPECT_EQ("z", s);
+}
+
+// Remove all of a prefix block
+TEST(CordSpliceTest, ZedBlockSuffix0) {
+ absl::Cord blob = CordWithZedBlock(10);
+ EXPECT_EQ(10, blob.size());
+ absl::Cord suffix(blob);
+ suffix.RemovePrefix(10);
+ EXPECT_EQ(0, suffix.size());
+ std::string s;
+ absl::CopyCordToString(suffix, &s);
+ EXPECT_EQ("", s);
+}
+
+absl::Cord BigCord(size_t len, char v) {
+ std::string s(len, v);
+ return absl::Cord(s);
+}
+
+// Splice block into cord.
+absl::Cord SpliceCord(const absl::Cord& blob, int64_t offset,
+ const absl::Cord& block) {
+ ABSL_RAW_CHECK(offset >= 0, "");
+ ABSL_RAW_CHECK(offset + block.size() <= blob.size(), "");
+ absl::Cord result(blob);
+ result.RemoveSuffix(blob.size() - offset);
+ result.Append(block);
+ absl::Cord suffix(blob);
+ suffix.RemovePrefix(offset + block.size());
+ result.Append(suffix);
+ ABSL_RAW_CHECK(blob.size() == result.size(), "");
+ return result;
+}
+
+// Taking an empty suffix of a block breaks appending.
+TEST(CordSpliceTest, RemoveEntireBlock1) {
+ absl::Cord zero = CordWithZedBlock(10);
+ absl::Cord suffix(zero);
+ suffix.RemovePrefix(10);
+ absl::Cord result;
+ result.Append(suffix);
+}
+
+TEST(CordSpliceTest, RemoveEntireBlock2) {
+ absl::Cord zero = CordWithZedBlock(10);
+ absl::Cord prefix(zero);
+ prefix.RemoveSuffix(10);
+ absl::Cord suffix(zero);
+ suffix.RemovePrefix(10);
+ absl::Cord result(prefix);
+ result.Append(suffix);
+}
+
+TEST(CordSpliceTest, RemoveEntireBlock3) {
+ absl::Cord blob = CordWithZedBlock(10);
+ absl::Cord block = BigCord(10, 'b');
+ blob = SpliceCord(blob, 0, block);
+}
+
+struct CordCompareTestCase {
+ template <typename LHS, typename RHS>
+ CordCompareTestCase(const LHS& lhs, const RHS& rhs)
+ : lhs_cord(lhs), rhs_cord(rhs) {}
+
+ absl::Cord lhs_cord;
+ absl::Cord rhs_cord;
+};
+
+const auto sign = [](int x) { return x == 0 ? 0 : (x > 0 ? 1 : -1); };
+
+void VerifyComparison(const CordCompareTestCase& test_case) {
+ std::string lhs_string(test_case.lhs_cord);
+ std::string rhs_string(test_case.rhs_cord);
+ int expected = sign(lhs_string.compare(rhs_string));
+ EXPECT_EQ(expected, test_case.lhs_cord.Compare(test_case.rhs_cord))
+ << "LHS=" << lhs_string << "; RHS=" << rhs_string;
+ EXPECT_EQ(expected, test_case.lhs_cord.Compare(rhs_string))
+ << "LHS=" << lhs_string << "; RHS=" << rhs_string;
+ EXPECT_EQ(-expected, test_case.rhs_cord.Compare(test_case.lhs_cord))
+ << "LHS=" << rhs_string << "; RHS=" << lhs_string;
+ EXPECT_EQ(-expected, test_case.rhs_cord.Compare(lhs_string))
+ << "LHS=" << rhs_string << "; RHS=" << lhs_string;
+}
+
+TEST(Cord, Compare) {
+ absl::Cord subcord("aaaaaBBBBBcccccDDDDD");
+ subcord = subcord.Subcord(3, 10);
+
+ absl::Cord tmp("aaaaaaaaaaaaaaaa");
+ tmp.Append("BBBBBBBBBBBBBBBB");
+ absl::Cord concat = absl::Cord("cccccccccccccccc");
+ concat.Append("DDDDDDDDDDDDDDDD");
+ concat.Prepend(tmp);
+
+ absl::Cord concat2("aaaaaaaaaaaaa");
+ concat2.Append("aaaBBBBBBBBBBBBBBBBccccc");
+ concat2.Append("cccccccccccDDDDDDDDDDDDDD");
+ concat2.Append("DD");
+
+ std::vector<CordCompareTestCase> test_cases = {{
+ // Inline cords
+ {"abcdef", "abcdef"},
+ {"abcdef", "abcdee"},
+ {"abcdef", "abcdeg"},
+ {"bbcdef", "abcdef"},
+ {"bbcdef", "abcdeg"},
+ {"abcdefa", "abcdef"},
+ {"abcdef", "abcdefa"},
+
+ // Small flat cords
+ {"aaaaaBBBBBcccccDDDDD", "aaaaaBBBBBcccccDDDDD"},
+ {"aaaaaBBBBBcccccDDDDD", "aaaaaBBBBBxccccDDDDD"},
+ {"aaaaaBBBBBcxcccDDDDD", "aaaaaBBBBBcccccDDDDD"},
+ {"aaaaaBBBBBxccccDDDDD", "aaaaaBBBBBcccccDDDDX"},
+ {"aaaaaBBBBBcccccDDDDDa", "aaaaaBBBBBcccccDDDDD"},
+ {"aaaaaBBBBBcccccDDDDD", "aaaaaBBBBBcccccDDDDDa"},
+
+ // Subcords
+ {subcord, subcord},
+ {subcord, "aaBBBBBccc"},
+ {subcord, "aaBBBBBccd"},
+ {subcord, "aaBBBBBccb"},
+ {subcord, "aaBBBBBxcb"},
+ {subcord, "aaBBBBBccca"},
+ {subcord, "aaBBBBBcc"},
+
+ // Concats
+ {concat, concat},
+ {concat,
+ "aaaaaaaaaaaaaaaaBBBBBBBBBBBBBBBBccccccccccccccccDDDDDDDDDDDDDDDD"},
+ {concat,
+ "aaaaaaaaaaaaaaaaBBBBBBBBBBBBBBBBcccccccccccccccxDDDDDDDDDDDDDDDD"},
+ {concat,
+ "aaaaaaaaaaaaaaaaBBBBBBBBBBBBBBBBacccccccccccccccDDDDDDDDDDDDDDDD"},
+ {concat,
+ "aaaaaaaaaaaaaaaaBBBBBBBBBBBBBBBBccccccccccccccccDDDDDDDDDDDDDDD"},
+ {concat,
+ "aaaaaaaaaaaaaaaaBBBBBBBBBBBBBBBBccccccccccccccccDDDDDDDDDDDDDDDDe"},
+
+ {concat, concat2},
+ }};
+
+ for (const auto& tc : test_cases) {
+ VerifyComparison(tc);
+ }
+}
+
+TEST(Cord, CompareAfterAssign) {
+ absl::Cord a("aaaaaa1111111");
+ absl::Cord b("aaaaaa2222222");
+ a = "cccccc";
+ b = "cccccc";
+ EXPECT_EQ(a, b);
+ EXPECT_FALSE(a < b);
+
+ a = "aaaa";
+ b = "bbbbb";
+ a = "";
+ b = "";
+ EXPECT_EQ(a, b);
+ EXPECT_FALSE(a < b);
+}
+
+// Test CompareTo() and ComparePrefix() against string and substring
+// comparison methods from basic_string.
+static void TestCompare(const absl::Cord& c, const absl::Cord& d,
+ RandomEngine* rng) {
+ typedef std::basic_string<uint8_t> ustring;
+ ustring cs(reinterpret_cast<const uint8_t*>(std::string(c).data()), c.size());
+ ustring ds(reinterpret_cast<const uint8_t*>(std::string(d).data()), d.size());
+ // ustring comparison is ideal because we expect Cord comparisons to be
+ // based on unsigned byte comparisons regardless of whether char is signed.
+ int expected = sign(cs.compare(ds));
+ EXPECT_EQ(expected, sign(c.Compare(d))) << c << ", " << d;
+}
+
+TEST(Compare, ComparisonIsUnsigned) {
+ RandomEngine rng(testing::GTEST_FLAG(random_seed));
+ std::uniform_int_distribution<uint32_t> uniform_uint8(0, 255);
+ char x = static_cast<char>(uniform_uint8(rng));
+ TestCompare(
+ absl::Cord(std::string(GetUniformRandomUpTo(&rng, 100), x)),
+ absl::Cord(std::string(GetUniformRandomUpTo(&rng, 100), x ^ 0x80)), &rng);
+}
+
+TEST(Compare, RandomComparisons) {
+ const int kIters = 5000;
+ RandomEngine rng(testing::GTEST_FLAG(random_seed));
+
+ int n = GetUniformRandomUpTo(&rng, 5000);
+ absl::Cord a[] = {MakeExternalCord(n),
+ absl::Cord("ant"),
+ absl::Cord("elephant"),
+ absl::Cord("giraffe"),
+ absl::Cord(std::string(GetUniformRandomUpTo(&rng, 100),
+ GetUniformRandomUpTo(&rng, 100))),
+ absl::Cord(""),
+ absl::Cord("x"),
+ absl::Cord("A"),
+ absl::Cord("B"),
+ absl::Cord("C")};
+ for (int i = 0; i < kIters; i++) {
+ absl::Cord c, d;
+ for (int j = 0; j < (i % 7) + 1; j++) {
+ c.Append(a[GetUniformRandomUpTo(&rng, ABSL_ARRAYSIZE(a))]);
+ d.Append(a[GetUniformRandomUpTo(&rng, ABSL_ARRAYSIZE(a))]);
+ }
+ std::bernoulli_distribution coin_flip(0.5);
+ TestCompare(coin_flip(rng) ? c : absl::Cord(std::string(c)),
+ coin_flip(rng) ? d : absl::Cord(std::string(d)), &rng);
+ }
+}
+
+template <typename T1, typename T2>
+void CompareOperators() {
+ const T1 a("a");
+ const T2 b("b");
+
+ EXPECT_TRUE(a == a);
+ // For pointer type (i.e. `const char*`), operator== compares the address
+ // instead of the string, so `a == const char*("a")` isn't necessarily true.
+ EXPECT_TRUE(std::is_pointer<T1>::value || a == T1("a"));
+ EXPECT_TRUE(std::is_pointer<T2>::value || a == T2("a"));
+ EXPECT_FALSE(a == b);
+
+ EXPECT_TRUE(a != b);
+ EXPECT_FALSE(a != a);
+
+ EXPECT_TRUE(a < b);
+ EXPECT_FALSE(b < a);
+
+ EXPECT_TRUE(b > a);
+ EXPECT_FALSE(a > b);
+
+ EXPECT_TRUE(a >= a);
+ EXPECT_TRUE(b >= a);
+ EXPECT_FALSE(a >= b);
+
+ EXPECT_TRUE(a <= a);
+ EXPECT_TRUE(a <= b);
+ EXPECT_FALSE(b <= a);
+}
+
+TEST(ComparisonOperators, Cord_Cord) {
+ CompareOperators<absl::Cord, absl::Cord>();
+}
+
+TEST(ComparisonOperators, Cord_StringPiece) {
+ CompareOperators<absl::Cord, absl::string_view>();
+}
+
+TEST(ComparisonOperators, StringPiece_Cord) {
+ CompareOperators<absl::string_view, absl::Cord>();
+}
+
+TEST(ComparisonOperators, Cord_string) {
+ CompareOperators<absl::Cord, std::string>();
+}
+
+TEST(ComparisonOperators, string_Cord) {
+ CompareOperators<std::string, absl::Cord>();
+}
+
+TEST(ComparisonOperators, stdstring_Cord) {
+ CompareOperators<std::string, absl::Cord>();
+}
+
+TEST(ComparisonOperators, Cord_stdstring) {
+ CompareOperators<absl::Cord, std::string>();
+}
+
+TEST(ComparisonOperators, charstar_Cord) {
+ CompareOperators<const char*, absl::Cord>();
+}
+
+TEST(ComparisonOperators, Cord_charstar) {
+ CompareOperators<absl::Cord, const char*>();
+}
+
+TEST(ConstructFromExternal, ReleaserInvoked) {
+ // Empty external memory means the releaser should be called immediately.
+ {
+ bool invoked = false;
+ auto releaser = [&invoked](absl::string_view) { invoked = true; };
+ {
+ auto c = absl::MakeCordFromExternal("", releaser);
+ EXPECT_TRUE(invoked);
+ }
+ }
+
+ // If the size of the data is small enough, a future constructor
+ // implementation may copy the bytes and immediately invoke the releaser
+ // instead of creating an external node. We make a large dummy std::string to
+ // make this test independent of such an optimization.
+ std::string large_dummy(2048, 'c');
+ {
+ bool invoked = false;
+ auto releaser = [&invoked](absl::string_view) { invoked = true; };
+ {
+ auto c = absl::MakeCordFromExternal(large_dummy, releaser);
+ EXPECT_FALSE(invoked);
+ }
+ EXPECT_TRUE(invoked);
+ }
+
+ {
+ bool invoked = false;
+ auto releaser = [&invoked](absl::string_view) { invoked = true; };
+ {
+ absl::Cord copy;
+ {
+ auto c = absl::MakeCordFromExternal(large_dummy, releaser);
+ copy = c;
+ EXPECT_FALSE(invoked);
+ }
+ EXPECT_FALSE(invoked);
+ }
+ EXPECT_TRUE(invoked);
+ }
+}
+
+TEST(ConstructFromExternal, CompareContents) {
+ RandomEngine rng(testing::GTEST_FLAG(random_seed));
+
+ for (int length = 1; length <= 2048; length *= 2) {
+ std::string data = RandomLowercaseString(&rng, length);
+ auto* external = new std::string(data);
+ auto cord =
+ absl::MakeCordFromExternal(*external, [external](absl::string_view sv) {
+ EXPECT_EQ(external->data(), sv.data());
+ EXPECT_EQ(external->size(), sv.size());
+ delete external;
+ });
+ EXPECT_EQ(data, cord);
+ }
+}
+
+TEST(ConstructFromExternal, LargeReleaser) {
+ RandomEngine rng(testing::GTEST_FLAG(random_seed));
+ constexpr size_t kLength = 256;
+ std::string data = RandomLowercaseString(&rng, kLength);
+ std::array<char, kLength> data_array;
+ for (size_t i = 0; i < kLength; ++i) data_array[i] = data[i];
+ bool invoked = false;
+ auto releaser = [data_array, &invoked](absl::string_view data) {
+ EXPECT_EQ(data, absl::string_view(data_array.data(), data_array.size()));
+ invoked = true;
+ };
+ (void)absl::MakeCordFromExternal(data, releaser);
+ EXPECT_TRUE(invoked);
+}
+
+TEST(ConstructFromExternal, FunctionPointerReleaser) {
+ static absl::string_view data("hello world");
+ static bool invoked;
+ auto* releaser =
+ static_cast<void (*)(absl::string_view)>([](absl::string_view sv) {
+ EXPECT_EQ(data, sv);
+ invoked = true;
+ });
+ invoked = false;
+ (void)absl::MakeCordFromExternal(data, releaser);
+ EXPECT_TRUE(invoked);
+
+ invoked = false;
+ (void)absl::MakeCordFromExternal(data, *releaser);
+ EXPECT_TRUE(invoked);
+}
+
+TEST(ConstructFromExternal, MoveOnlyReleaser) {
+ struct Releaser {
+ explicit Releaser(bool* invoked) : invoked(invoked) {}
+ Releaser(Releaser&& other) noexcept : invoked(other.invoked) {}
+ void operator()(absl::string_view) const { *invoked = true; }
+
+ bool* invoked;
+ };
+
+ bool invoked = false;
+ (void)absl::MakeCordFromExternal("dummy", Releaser(&invoked));
+ EXPECT_TRUE(invoked);
+}
+
+TEST(ConstructFromExternal, NoArgLambda) {
+ bool invoked = false;
+ (void)absl::MakeCordFromExternal("dummy", [&invoked]() { invoked = true; });
+ EXPECT_TRUE(invoked);
+}
+
+TEST(ConstructFromExternal, StringViewArgLambda) {
+ bool invoked = false;
+ (void)absl::MakeCordFromExternal(
+ "dummy", [&invoked](absl::string_view) { invoked = true; });
+ EXPECT_TRUE(invoked);
+}
+
+TEST(ConstructFromExternal, NonTrivialReleaserDestructor) {
+ struct Releaser {
+ explicit Releaser(bool* destroyed) : destroyed(destroyed) {}
+ ~Releaser() { *destroyed = true; }
+ void operator()(absl::string_view) const {}
+
+ bool* destroyed;
+ };
+
+ bool destroyed = false;
+ Releaser releaser(&destroyed);
+ (void)absl::MakeCordFromExternal("dummy", releaser);
+ EXPECT_TRUE(destroyed);
+}
+
+TEST(ConstructFromExternal, ReferenceQualifierOverloads) {
+ struct Releaser {
+ void operator()(absl::string_view) & { *lvalue_invoked = true; }
+ void operator()(absl::string_view) && { *rvalue_invoked = true; }
+
+ bool* lvalue_invoked;
+ bool* rvalue_invoked;
+ };
+
+ bool lvalue_invoked = false;
+ bool rvalue_invoked = false;
+ Releaser releaser = {&lvalue_invoked, &rvalue_invoked};
+ (void)absl::MakeCordFromExternal("", releaser);
+ EXPECT_FALSE(lvalue_invoked);
+ EXPECT_TRUE(rvalue_invoked);
+ rvalue_invoked = false;
+
+ (void)absl::MakeCordFromExternal("dummy", releaser);
+ EXPECT_FALSE(lvalue_invoked);
+ EXPECT_TRUE(rvalue_invoked);
+ rvalue_invoked = false;
+
+ // NOLINTNEXTLINE: suppress clang-tidy std::move on trivially copyable type.
+ (void)absl::MakeCordFromExternal("dummy", std::move(releaser));
+ EXPECT_FALSE(lvalue_invoked);
+ EXPECT_TRUE(rvalue_invoked);
+}
+
+TEST(ExternalMemory, BasicUsage) {
+ static const char* strings[] = {"", "hello", "there"};
+ for (const char* str : strings) {
+ absl::Cord dst("(prefix)");
+ AddExternalMemory(str, &dst);
+ dst.Append("(suffix)");
+ EXPECT_EQ((std::string("(prefix)") + str + std::string("(suffix)")),
+ std::string(dst));
+ }
+}
+
+TEST(ExternalMemory, RemovePrefixSuffix) {
+ // Exhaustively try all sub-strings.
+ absl::Cord cord = MakeComposite();
+ std::string s = std::string(cord);
+ for (int offset = 0; offset <= s.size(); offset++) {
+ for (int length = 0; length <= s.size() - offset; length++) {
+ absl::Cord result(cord);
+ result.RemovePrefix(offset);
+ result.RemoveSuffix(result.size() - length);
+ EXPECT_EQ(s.substr(offset, length), std::string(result))
+ << offset << " " << length;
+ }
+ }
+}
+
+TEST(ExternalMemory, Get) {
+ absl::Cord cord("hello");
+ AddExternalMemory(" world!", &cord);
+ AddExternalMemory(" how are ", &cord);
+ cord.Append(" you?");
+ std::string s = std::string(cord);
+ for (int i = 0; i < s.size(); i++) {
+ EXPECT_EQ(s[i], cord[i]);
+ }
+}
+
+// CordMemoryUsage tests verify the correctness of the EstimatedMemoryUsage()
+// These tests take into account that the reported memory usage is approximate
+// and non-deterministic. For all tests, We verify that the reported memory
+// usage is larger than `size()`, and less than `size() * 1.5` as a cord should
+// never reserve more 'extra' capacity than half of its size as it grows.
+// Additionally we have some whiteboxed expectations based on our knowledge of
+// the layout and size of empty and inlined cords, and flat nodes.
+
+TEST(CordMemoryUsage, Empty) {
+ EXPECT_EQ(sizeof(absl::Cord), absl::Cord().EstimatedMemoryUsage());
+}
+
+TEST(CordMemoryUsage, Embedded) {
+ absl::Cord a("hello");
+ EXPECT_EQ(a.EstimatedMemoryUsage(), sizeof(absl::Cord));
+}
+
+TEST(CordMemoryUsage, EmbeddedAppend) {
+ absl::Cord a("a");
+ absl::Cord b("bcd");
+ EXPECT_EQ(b.EstimatedMemoryUsage(), sizeof(absl::Cord));
+ a.Append(b);
+ EXPECT_EQ(a.EstimatedMemoryUsage(), sizeof(absl::Cord));
+}
+
+TEST(CordMemoryUsage, ExternalMemory) {
+ static const int kLength = 1000;
+ absl::Cord cord;
+ AddExternalMemory(std::string(kLength, 'x'), &cord);
+ EXPECT_GT(cord.EstimatedMemoryUsage(), kLength);
+ EXPECT_LE(cord.EstimatedMemoryUsage(), kLength * 1.5);
+}
+
+TEST(CordMemoryUsage, Flat) {
+ static const int kLength = 125;
+ absl::Cord a(std::string(kLength, 'a'));
+ EXPECT_GT(a.EstimatedMemoryUsage(), kLength);
+ EXPECT_LE(a.EstimatedMemoryUsage(), kLength * 1.5);
+}
+
+TEST(CordMemoryUsage, AppendFlat) {
+ using absl::strings_internal::CordTestAccess;
+ absl::Cord a(std::string(CordTestAccess::MaxFlatLength(), 'a'));
+ size_t length = a.EstimatedMemoryUsage();
+ a.Append(std::string(CordTestAccess::MaxFlatLength(), 'b'));
+ size_t delta = a.EstimatedMemoryUsage() - length;
+ EXPECT_GT(delta, CordTestAccess::MaxFlatLength());
+ EXPECT_LE(delta, CordTestAccess::MaxFlatLength() * 1.5);
+}
+
+// Regtest for a change that had to be rolled back because it expanded out
+// of the InlineRep too soon, which was observable through MemoryUsage().
+TEST(CordMemoryUsage, InlineRep) {
+ constexpr size_t kMaxInline = 15; // Cord::InlineRep::N
+ const std::string small_string(kMaxInline, 'x');
+ absl::Cord c1(small_string);
+
+ absl::Cord c2;
+ c2.Append(small_string);
+ EXPECT_EQ(c1, c2);
+ EXPECT_EQ(c1.EstimatedMemoryUsage(), c2.EstimatedMemoryUsage());
+}
+
+} // namespace
+
+// Regtest for 7510292 (fix a bug introduced by 7465150)
+TEST(Cord, Concat_Append) {
+ // Create a rep of type CONCAT
+ absl::Cord s1("foobarbarbarbarbar");
+ s1.Append("abcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefg");
+ size_t size = s1.size();
+
+ // Create a copy of s1 and append to it.
+ absl::Cord s2 = s1;
+ s2.Append("x");
+
+ // 7465150 modifies s1 when it shouldn't.
+ EXPECT_EQ(s1.size(), size);
+ EXPECT_EQ(s2.size(), size + 1);
+}
+
+TEST(MakeFragmentedCord, MakeFragmentedCordFromInitializerList) {
+ absl::Cord fragmented =
+ absl::MakeFragmentedCord({"A ", "fragmented ", "Cord"});
+
+ EXPECT_EQ("A fragmented Cord", fragmented);
+
+ auto chunk_it = fragmented.chunk_begin();
+
+ ASSERT_TRUE(chunk_it != fragmented.chunk_end());
+ EXPECT_EQ("A ", *chunk_it);
+
+ ASSERT_TRUE(++chunk_it != fragmented.chunk_end());
+ EXPECT_EQ("fragmented ", *chunk_it);
+
+ ASSERT_TRUE(++chunk_it != fragmented.chunk_end());
+ EXPECT_EQ("Cord", *chunk_it);
+
+ ASSERT_TRUE(++chunk_it == fragmented.chunk_end());
+}
+
+TEST(MakeFragmentedCord, MakeFragmentedCordFromVector) {
+ std::vector<absl::string_view> chunks = {"A ", "fragmented ", "Cord"};
+ absl::Cord fragmented = absl::MakeFragmentedCord(chunks);
+
+ EXPECT_EQ("A fragmented Cord", fragmented);
+
+ auto chunk_it = fragmented.chunk_begin();
+
+ ASSERT_TRUE(chunk_it != fragmented.chunk_end());
+ EXPECT_EQ("A ", *chunk_it);
+
+ ASSERT_TRUE(++chunk_it != fragmented.chunk_end());
+ EXPECT_EQ("fragmented ", *chunk_it);
+
+ ASSERT_TRUE(++chunk_it != fragmented.chunk_end());
+ EXPECT_EQ("Cord", *chunk_it);
+
+ ASSERT_TRUE(++chunk_it == fragmented.chunk_end());
+}
+
+TEST(CordChunkIterator, Traits) {
+ static_assert(std::is_copy_constructible<absl::Cord::ChunkIterator>::value,
+ "");
+ static_assert(std::is_copy_assignable<absl::Cord::ChunkIterator>::value, "");
+
+ // Move semantics to satisfy swappable via std::swap
+ static_assert(std::is_move_constructible<absl::Cord::ChunkIterator>::value,
+ "");
+ static_assert(std::is_move_assignable<absl::Cord::ChunkIterator>::value, "");
+
+ static_assert(
+ std::is_same<
+ std::iterator_traits<absl::Cord::ChunkIterator>::iterator_category,
+ std::input_iterator_tag>::value,
+ "");
+ static_assert(
+ std::is_same<std::iterator_traits<absl::Cord::ChunkIterator>::value_type,
+ absl::string_view>::value,
+ "");
+ static_assert(
+ std::is_same<
+ std::iterator_traits<absl::Cord::ChunkIterator>::difference_type,
+ ptrdiff_t>::value,
+ "");
+ static_assert(
+ std::is_same<std::iterator_traits<absl::Cord::ChunkIterator>::pointer,
+ const absl::string_view*>::value,
+ "");
+ static_assert(
+ std::is_same<std::iterator_traits<absl::Cord::ChunkIterator>::reference,
+ absl::string_view>::value,
+ "");
+}
+
+static void VerifyChunkIterator(const absl::Cord& cord,
+ size_t expected_chunks) {
+ EXPECT_EQ(cord.chunk_begin() == cord.chunk_end(), cord.empty()) << cord;
+ EXPECT_EQ(cord.chunk_begin() != cord.chunk_end(), !cord.empty());
+
+ absl::Cord::ChunkRange range = cord.Chunks();
+ EXPECT_EQ(range.begin() == range.end(), cord.empty());
+ EXPECT_EQ(range.begin() != range.end(), !cord.empty());
+
+ std::string content(cord);
+ size_t pos = 0;
+ auto pre_iter = cord.chunk_begin(), post_iter = cord.chunk_begin();
+ size_t n_chunks = 0;
+ while (pre_iter != cord.chunk_end() && post_iter != cord.chunk_end()) {
+ EXPECT_FALSE(pre_iter == cord.chunk_end()); // NOLINT: explicitly test ==
+ EXPECT_FALSE(post_iter == cord.chunk_end()); // NOLINT
+
+ EXPECT_EQ(pre_iter, post_iter);
+ EXPECT_EQ(*pre_iter, *post_iter);
+
+ EXPECT_EQ(pre_iter->data(), (*pre_iter).data());
+ EXPECT_EQ(pre_iter->size(), (*pre_iter).size());
+
+ absl::string_view chunk = *pre_iter;
+ EXPECT_FALSE(chunk.empty());
+ EXPECT_LE(pos + chunk.size(), content.size());
+ EXPECT_EQ(absl::string_view(content.c_str() + pos, chunk.size()), chunk);
+
+ int n_equal_iterators = 0;
+ for (absl::Cord::ChunkIterator it = range.begin(); it != range.end();
+ ++it) {
+ n_equal_iterators += static_cast<int>(it == pre_iter);
+ }
+ EXPECT_EQ(n_equal_iterators, 1);
+
+ ++pre_iter;
+ EXPECT_EQ(*post_iter++, chunk);
+
+ pos += chunk.size();
+ ++n_chunks;
+ }
+ EXPECT_EQ(expected_chunks, n_chunks);
+ EXPECT_EQ(pos, content.size());
+ EXPECT_TRUE(pre_iter == cord.chunk_end()); // NOLINT: explicitly test ==
+ EXPECT_TRUE(post_iter == cord.chunk_end()); // NOLINT
+}
+
+TEST(CordChunkIterator, Operations) {
+ absl::Cord empty_cord;
+ VerifyChunkIterator(empty_cord, 0);
+
+ absl::Cord small_buffer_cord("small cord");
+ VerifyChunkIterator(small_buffer_cord, 1);
+
+ absl::Cord flat_node_cord("larger than small buffer optimization");
+ VerifyChunkIterator(flat_node_cord, 1);
+
+ VerifyChunkIterator(
+ absl::MakeFragmentedCord({"a ", "small ", "fragmented ", "cord ", "for ",
+ "testing ", "chunk ", "iterations."}),
+ 8);
+
+ absl::Cord reused_nodes_cord(std::string(40, 'c'));
+ reused_nodes_cord.Prepend(absl::Cord(std::string(40, 'b')));
+ reused_nodes_cord.Prepend(absl::Cord(std::string(40, 'a')));
+ size_t expected_chunks = 3;
+ for (int i = 0; i < 8; ++i) {
+ reused_nodes_cord.Prepend(reused_nodes_cord);
+ expected_chunks *= 2;
+ VerifyChunkIterator(reused_nodes_cord, expected_chunks);
+ }
+
+ RandomEngine rng(testing::GTEST_FLAG(random_seed));
+ absl::Cord flat_cord(RandomLowercaseString(&rng, 256));
+ absl::Cord subcords;
+ for (int i = 0; i < 128; ++i) subcords.Prepend(flat_cord.Subcord(i, 128));
+ VerifyChunkIterator(subcords, 128);
+}
+
+TEST(CordCharIterator, Traits) {
+ static_assert(std::is_copy_constructible<absl::Cord::CharIterator>::value,
+ "");
+ static_assert(std::is_copy_assignable<absl::Cord::CharIterator>::value, "");
+
+ // Move semantics to satisfy swappable via std::swap
+ static_assert(std::is_move_constructible<absl::Cord::CharIterator>::value,
+ "");
+ static_assert(std::is_move_assignable<absl::Cord::CharIterator>::value, "");
+
+ static_assert(
+ std::is_same<
+ std::iterator_traits<absl::Cord::CharIterator>::iterator_category,
+ std::input_iterator_tag>::value,
+ "");
+ static_assert(
+ std::is_same<std::iterator_traits<absl::Cord::CharIterator>::value_type,
+ char>::value,
+ "");
+ static_assert(
+ std::is_same<
+ std::iterator_traits<absl::Cord::CharIterator>::difference_type,
+ ptrdiff_t>::value,
+ "");
+ static_assert(
+ std::is_same<std::iterator_traits<absl::Cord::CharIterator>::pointer,
+ const char*>::value,
+ "");
+ static_assert(
+ std::is_same<std::iterator_traits<absl::Cord::CharIterator>::reference,
+ const char&>::value,
+ "");
+}
+
+static void VerifyCharIterator(const absl::Cord& cord) {
+ EXPECT_EQ(cord.char_begin() == cord.char_end(), cord.empty());
+ EXPECT_EQ(cord.char_begin() != cord.char_end(), !cord.empty());
+
+ absl::Cord::CharRange range = cord.Chars();
+ EXPECT_EQ(range.begin() == range.end(), cord.empty());
+ EXPECT_EQ(range.begin() != range.end(), !cord.empty());
+
+ size_t i = 0;
+ absl::Cord::CharIterator pre_iter = cord.char_begin();
+ absl::Cord::CharIterator post_iter = cord.char_begin();
+ std::string content(cord);
+ while (pre_iter != cord.char_end() && post_iter != cord.char_end()) {
+ EXPECT_FALSE(pre_iter == cord.char_end()); // NOLINT: explicitly test ==
+ EXPECT_FALSE(post_iter == cord.char_end()); // NOLINT
+
+ EXPECT_LT(i, cord.size());
+ EXPECT_EQ(content[i], *pre_iter);
+
+ EXPECT_EQ(pre_iter, post_iter);
+ EXPECT_EQ(*pre_iter, *post_iter);
+ EXPECT_EQ(&*pre_iter, &*post_iter);
+
+ EXPECT_EQ(&*pre_iter, pre_iter.operator->());
+
+ const char* character_address = &*pre_iter;
+ absl::Cord::CharIterator copy = pre_iter;
+ ++copy;
+ EXPECT_EQ(character_address, &*pre_iter);
+
+ int n_equal_iterators = 0;
+ for (absl::Cord::CharIterator it = range.begin(); it != range.end(); ++it) {
+ n_equal_iterators += static_cast<int>(it == pre_iter);
+ }
+ EXPECT_EQ(n_equal_iterators, 1);
+
+ absl::Cord::CharIterator advance_iter = range.begin();
+ absl::Cord::Advance(&advance_iter, i);
+ EXPECT_EQ(pre_iter, advance_iter);
+
+ advance_iter = range.begin();
+ EXPECT_EQ(absl::Cord::AdvanceAndRead(&advance_iter, i), cord.Subcord(0, i));
+ EXPECT_EQ(pre_iter, advance_iter);
+
+ advance_iter = pre_iter;
+ absl::Cord::Advance(&advance_iter, cord.size() - i);
+ EXPECT_EQ(range.end(), advance_iter);
+
+ advance_iter = pre_iter;
+ EXPECT_EQ(absl::Cord::AdvanceAndRead(&advance_iter, cord.size() - i),
+ cord.Subcord(i, cord.size() - i));
+ EXPECT_EQ(range.end(), advance_iter);
+
+ ++i;
+ ++pre_iter;
+ post_iter++;
+ }
+ EXPECT_EQ(i, cord.size());
+ EXPECT_TRUE(pre_iter == cord.char_end()); // NOLINT: explicitly test ==
+ EXPECT_TRUE(post_iter == cord.char_end()); // NOLINT
+
+ absl::Cord::CharIterator zero_advanced_end = cord.char_end();
+ absl::Cord::Advance(&zero_advanced_end, 0);
+ EXPECT_EQ(zero_advanced_end, cord.char_end());
+
+ absl::Cord::CharIterator it = cord.char_begin();
+ for (absl::string_view chunk : cord.Chunks()) {
+ while (!chunk.empty()) {
+ EXPECT_EQ(absl::Cord::ChunkRemaining(it), chunk);
+ chunk.remove_prefix(1);
+ ++it;
+ }
+ }
+}
+
+TEST(CordCharIterator, Operations) {
+ absl::Cord empty_cord;
+ VerifyCharIterator(empty_cord);
+
+ absl::Cord small_buffer_cord("small cord");
+ VerifyCharIterator(small_buffer_cord);
+
+ absl::Cord flat_node_cord("larger than small buffer optimization");
+ VerifyCharIterator(flat_node_cord);
+
+ VerifyCharIterator(
+ absl::MakeFragmentedCord({"a ", "small ", "fragmented ", "cord ", "for ",
+ "testing ", "character ", "iteration."}));
+
+ absl::Cord reused_nodes_cord("ghi");
+ reused_nodes_cord.Prepend(absl::Cord("def"));
+ reused_nodes_cord.Prepend(absl::Cord("abc"));
+ for (int i = 0; i < 4; ++i) {
+ reused_nodes_cord.Prepend(reused_nodes_cord);
+ VerifyCharIterator(reused_nodes_cord);
+ }
+
+ RandomEngine rng(testing::GTEST_FLAG(random_seed));
+ absl::Cord flat_cord(RandomLowercaseString(&rng, 256));
+ absl::Cord subcords;
+ for (int i = 0; i < 4; ++i) subcords.Prepend(flat_cord.Subcord(16 * i, 128));
+ VerifyCharIterator(subcords);
+}
+
+TEST(Cord, StreamingOutput) {
+ absl::Cord c =
+ absl::MakeFragmentedCord({"A ", "small ", "fragmented ", "Cord", "."});
+ std::stringstream output;
+ output << c;
+ EXPECT_EQ("A small fragmented Cord.", output.str());
+}
+
+TEST(Cord, ForEachChunk) {
+ for (int num_elements : {1, 10, 200}) {
+ SCOPED_TRACE(num_elements);
+ std::vector<std::string> cord_chunks;
+ for (int i = 0; i < num_elements; ++i) {
+ cord_chunks.push_back(absl::StrCat("[", i, "]"));
+ }
+ absl::Cord c = absl::MakeFragmentedCord(cord_chunks);
+
+ std::vector<std::string> iterated_chunks;
+ absl::CordTestPeer::ForEachChunk(c,
+ [&iterated_chunks](absl::string_view sv) {
+ iterated_chunks.emplace_back(sv);
+ });
+ EXPECT_EQ(iterated_chunks, cord_chunks);
+ }
+}
+
+TEST(Cord, SmallBufferAssignFromOwnData) {
+ constexpr size_t kMaxInline = 15;
+ std::string contents = "small buff cord";
+ EXPECT_EQ(contents.size(), kMaxInline);
+ for (size_t pos = 0; pos < contents.size(); ++pos) {
+ for (size_t count = contents.size() - pos; count > 0; --count) {
+ absl::Cord c(contents);
+ absl::string_view flat = c.Flatten();
+ c = flat.substr(pos, count);
+ EXPECT_EQ(c, contents.substr(pos, count))
+ << "pos = " << pos << "; count = " << count;
+ }
+ }
+}
+
+TEST(Cord, Format) {
+ absl::Cord c;
+ absl::Format(&c, "There were %04d little %s.", 3, "pigs");
+ EXPECT_EQ(c, "There were 0003 little pigs.");
+ absl::Format(&c, "And %-3llx bad wolf!", 1);
+ EXPECT_EQ(c, "There were 0003 little pigs.And 1 bad wolf!");
+}
+
+TEST(CordDeathTest, Hardening) {
+ absl::Cord cord("hello");
+ // These statement should abort the program in all builds modes.
+ EXPECT_DEATH_IF_SUPPORTED(cord.RemovePrefix(6), "");
+ EXPECT_DEATH_IF_SUPPORTED(cord.RemoveSuffix(6), "");
+
+ bool test_hardening = false;
+ ABSL_HARDENING_ASSERT([&]() {
+ // This only runs when ABSL_HARDENING_ASSERT is active.
+ test_hardening = true;
+ return true;
+ }());
+ if (!test_hardening) return;
+
+ EXPECT_DEATH_IF_SUPPORTED(cord[5], "");
+ EXPECT_DEATH_IF_SUPPORTED(*cord.chunk_end(), "");
+ EXPECT_DEATH_IF_SUPPORTED(static_cast<void>(cord.chunk_end()->empty()), "");
+ EXPECT_DEATH_IF_SUPPORTED(++cord.chunk_end(), "");
+}
+
+class AfterExitCordTester {
+ public:
+ bool Set(absl::Cord* cord, absl::string_view expected) {
+ cord_ = cord;
+ expected_ = expected;
+ return true;
+ }
+
+ ~AfterExitCordTester() {
+ EXPECT_EQ(*cord_, expected_);
+ }
+ private:
+ absl::Cord* cord_;
+ absl::string_view expected_;
+};
+
+template <typename Str>
+void TestConstinitConstructor(Str) {
+ const auto expected = Str::value;
+ // Defined before `cord` to be destroyed after it.
+ static AfterExitCordTester exit_tester; // NOLINT
+ ABSL_CONST_INIT static absl::Cord cord(Str{}); // NOLINT
+ static bool init_exit_tester = exit_tester.Set(&cord, expected);
+ (void)init_exit_tester;
+
+ EXPECT_EQ(cord, expected);
+ // Copy the object and test the copy, and the original.
+ {
+ absl::Cord copy = cord;
+ EXPECT_EQ(copy, expected);
+ }
+ // The original still works
+ EXPECT_EQ(cord, expected);
+
+ // Try making adding more structure to the tree.
+ {
+ absl::Cord copy = cord;
+ std::string expected_copy(expected);
+ for (int i = 0; i < 10; ++i) {
+ copy.Append(cord);
+ absl::StrAppend(&expected_copy, expected);
+ EXPECT_EQ(copy, expected_copy);
+ }
+ }
+
+ // Make sure we are using the right branch during constant evaluation.
+ EXPECT_EQ(absl::CordTestPeer::IsTree(cord), cord.size() >= 16);
+
+ for (int i = 0; i < 10; ++i) {
+ // Make a few more Cords from the same global rep.
+ // This tests what happens when the refcount for it gets below 1.
+ EXPECT_EQ(expected, absl::Cord(Str{}));
+ }
+}
+
+constexpr int SimpleStrlen(const char* p) {
+ return *p ? 1 + SimpleStrlen(p + 1) : 0;
+}
+
+struct ShortView {
+ constexpr absl::string_view operator()() const {
+ return absl::string_view("SSO string", SimpleStrlen("SSO string"));
+ }
+};
+
+struct LongView {
+ constexpr absl::string_view operator()() const {
+ return absl::string_view("String that does not fit SSO.",
+ SimpleStrlen("String that does not fit SSO."));
+ }
+};
+
+
+TEST(Cord, ConstinitConstructor) {
+ TestConstinitConstructor(
+ absl::strings_internal::MakeStringConstant(ShortView{}));
+ TestConstinitConstructor(
+ absl::strings_internal::MakeStringConstant(LongView{}));
+}
diff --git a/third_party/abseil/src/absl/strings/cord_test_helpers.h b/third_party/abseil/src/absl/strings/cord_test_helpers.h
new file mode 100644
index 0000000..f1036e3
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/cord_test_helpers.h
@@ -0,0 +1,60 @@
+//
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+#ifndef ABSL_STRINGS_CORD_TEST_HELPERS_H_
+#define ABSL_STRINGS_CORD_TEST_HELPERS_H_
+
+#include "absl/strings/cord.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+// Creates a multi-segment Cord from an iterable container of strings. The
+// resulting Cord is guaranteed to have one segment for every string in the
+// container. This allows code to be unit tested with multi-segment Cord
+// inputs.
+//
+// Example:
+//
+// absl::Cord c = absl::MakeFragmentedCord({"A ", "fragmented ", "Cord"});
+// EXPECT_FALSE(c.GetFlat(&unused));
+//
+// The mechanism by which this Cord is created is an implementation detail. Any
+// implementation that produces a multi-segment Cord may produce a flat Cord in
+// the future as new optimizations are added to the Cord class.
+// MakeFragmentedCord will, however, always be updated to return a multi-segment
+// Cord.
+template <typename Container>
+Cord MakeFragmentedCord(const Container& c) {
+ Cord result;
+ for (const auto& s : c) {
+ auto* external = new std::string(s);
+ Cord tmp = absl::MakeCordFromExternal(
+ *external, [external](absl::string_view) { delete external; });
+ tmp.Prepend(result);
+ result = tmp;
+ }
+ return result;
+}
+
+inline Cord MakeFragmentedCord(std::initializer_list<absl::string_view> list) {
+ return MakeFragmentedCord<std::initializer_list<absl::string_view>>(list);
+}
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_STRINGS_CORD_TEST_HELPERS_H_
diff --git a/third_party/abseil/src/absl/strings/escaping.cc b/third_party/abseil/src/absl/strings/escaping.cc
new file mode 100644
index 0000000..18b20b8
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/escaping.cc
@@ -0,0 +1,949 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/strings/escaping.h"
+
+#include <algorithm>
+#include <cassert>
+#include <cstdint>
+#include <cstring>
+#include <iterator>
+#include <limits>
+#include <string>
+
+#include "absl/base/internal/endian.h"
+#include "absl/base/internal/raw_logging.h"
+#include "absl/base/internal/unaligned_access.h"
+#include "absl/strings/internal/char_map.h"
+#include "absl/strings/internal/escaping.h"
+#include "absl/strings/internal/resize_uninitialized.h"
+#include "absl/strings/internal/utf8.h"
+#include "absl/strings/str_cat.h"
+#include "absl/strings/str_join.h"
+#include "absl/strings/string_view.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace {
+
+// These are used for the leave_nulls_escaped argument to CUnescapeInternal().
+constexpr bool kUnescapeNulls = false;
+
+inline bool is_octal_digit(char c) { return ('0' <= c) && (c <= '7'); }
+
+inline int hex_digit_to_int(char c) {
+ static_assert('0' == 0x30 && 'A' == 0x41 && 'a' == 0x61,
+ "Character set must be ASCII.");
+ assert(absl::ascii_isxdigit(c));
+ int x = static_cast<unsigned char>(c);
+ if (x > '9') {
+ x += 9;
+ }
+ return x & 0xf;
+}
+
+inline bool IsSurrogate(char32_t c, absl::string_view src, std::string* error) {
+ if (c >= 0xD800 && c <= 0xDFFF) {
+ if (error) {
+ *error = absl::StrCat("invalid surrogate character (0xD800-DFFF): \\",
+ src);
+ }
+ return true;
+ }
+ return false;
+}
+
+// ----------------------------------------------------------------------
+// CUnescapeInternal()
+// Implements both CUnescape() and CUnescapeForNullTerminatedString().
+//
+// Unescapes C escape sequences and is the reverse of CEscape().
+//
+// If 'source' is valid, stores the unescaped string and its size in
+// 'dest' and 'dest_len' respectively, and returns true. Otherwise
+// returns false and optionally stores the error description in
+// 'error'. Set 'error' to nullptr to disable error reporting.
+//
+// 'dest' should point to a buffer that is at least as big as 'source'.
+// 'source' and 'dest' may be the same.
+//
+// NOTE: any changes to this function must also be reflected in the older
+// UnescapeCEscapeSequences().
+// ----------------------------------------------------------------------
+bool CUnescapeInternal(absl::string_view source, bool leave_nulls_escaped,
+ char* dest, ptrdiff_t* dest_len, std::string* error) {
+ char* d = dest;
+ const char* p = source.data();
+ const char* end = p + source.size();
+ const char* last_byte = end - 1;
+
+ // Small optimization for case where source = dest and there's no escaping
+ while (p == d && p < end && *p != '\\') p++, d++;
+
+ while (p < end) {
+ if (*p != '\\') {
+ *d++ = *p++;
+ } else {
+ if (++p > last_byte) { // skip past the '\\'
+ if (error) *error = "String cannot end with \\";
+ return false;
+ }
+ switch (*p) {
+ case 'a': *d++ = '\a'; break;
+ case 'b': *d++ = '\b'; break;
+ case 'f': *d++ = '\f'; break;
+ case 'n': *d++ = '\n'; break;
+ case 'r': *d++ = '\r'; break;
+ case 't': *d++ = '\t'; break;
+ case 'v': *d++ = '\v'; break;
+ case '\\': *d++ = '\\'; break;
+ case '?': *d++ = '\?'; break; // \? Who knew?
+ case '\'': *d++ = '\''; break;
+ case '"': *d++ = '\"'; break;
+ case '0':
+ case '1':
+ case '2':
+ case '3':
+ case '4':
+ case '5':
+ case '6':
+ case '7': {
+ // octal digit: 1 to 3 digits
+ const char* octal_start = p;
+ unsigned int ch = *p - '0';
+ if (p < last_byte && is_octal_digit(p[1])) ch = ch * 8 + *++p - '0';
+ if (p < last_byte && is_octal_digit(p[1]))
+ ch = ch * 8 + *++p - '0'; // now points at last digit
+ if (ch > 0xff) {
+ if (error) {
+ *error = "Value of \\" +
+ std::string(octal_start, p + 1 - octal_start) +
+ " exceeds 0xff";
+ }
+ return false;
+ }
+ if ((ch == 0) && leave_nulls_escaped) {
+ // Copy the escape sequence for the null character
+ const ptrdiff_t octal_size = p + 1 - octal_start;
+ *d++ = '\\';
+ memmove(d, octal_start, octal_size);
+ d += octal_size;
+ break;
+ }
+ *d++ = ch;
+ break;
+ }
+ case 'x':
+ case 'X': {
+ if (p >= last_byte) {
+ if (error) *error = "String cannot end with \\x";
+ return false;
+ } else if (!absl::ascii_isxdigit(p[1])) {
+ if (error) *error = "\\x cannot be followed by a non-hex digit";
+ return false;
+ }
+ unsigned int ch = 0;
+ const char* hex_start = p;
+ while (p < last_byte && absl::ascii_isxdigit(p[1]))
+ // Arbitrarily many hex digits
+ ch = (ch << 4) + hex_digit_to_int(*++p);
+ if (ch > 0xFF) {
+ if (error) {
+ *error = "Value of \\" +
+ std::string(hex_start, p + 1 - hex_start) +
+ " exceeds 0xff";
+ }
+ return false;
+ }
+ if ((ch == 0) && leave_nulls_escaped) {
+ // Copy the escape sequence for the null character
+ const ptrdiff_t hex_size = p + 1 - hex_start;
+ *d++ = '\\';
+ memmove(d, hex_start, hex_size);
+ d += hex_size;
+ break;
+ }
+ *d++ = ch;
+ break;
+ }
+ case 'u': {
+ // \uhhhh => convert 4 hex digits to UTF-8
+ char32_t rune = 0;
+ const char* hex_start = p;
+ if (p + 4 >= end) {
+ if (error) {
+ *error = "\\u must be followed by 4 hex digits: \\" +
+ std::string(hex_start, p + 1 - hex_start);
+ }
+ return false;
+ }
+ for (int i = 0; i < 4; ++i) {
+ // Look one char ahead.
+ if (absl::ascii_isxdigit(p[1])) {
+ rune = (rune << 4) + hex_digit_to_int(*++p); // Advance p.
+ } else {
+ if (error) {
+ *error = "\\u must be followed by 4 hex digits: \\" +
+ std::string(hex_start, p + 1 - hex_start);
+ }
+ return false;
+ }
+ }
+ if ((rune == 0) && leave_nulls_escaped) {
+ // Copy the escape sequence for the null character
+ *d++ = '\\';
+ memmove(d, hex_start, 5); // u0000
+ d += 5;
+ break;
+ }
+ if (IsSurrogate(rune, absl::string_view(hex_start, 5), error)) {
+ return false;
+ }
+ d += strings_internal::EncodeUTF8Char(d, rune);
+ break;
+ }
+ case 'U': {
+ // \Uhhhhhhhh => convert 8 hex digits to UTF-8
+ char32_t rune = 0;
+ const char* hex_start = p;
+ if (p + 8 >= end) {
+ if (error) {
+ *error = "\\U must be followed by 8 hex digits: \\" +
+ std::string(hex_start, p + 1 - hex_start);
+ }
+ return false;
+ }
+ for (int i = 0; i < 8; ++i) {
+ // Look one char ahead.
+ if (absl::ascii_isxdigit(p[1])) {
+ // Don't change rune until we're sure this
+ // is within the Unicode limit, but do advance p.
+ uint32_t newrune = (rune << 4) + hex_digit_to_int(*++p);
+ if (newrune > 0x10FFFF) {
+ if (error) {
+ *error = "Value of \\" +
+ std::string(hex_start, p + 1 - hex_start) +
+ " exceeds Unicode limit (0x10FFFF)";
+ }
+ return false;
+ } else {
+ rune = newrune;
+ }
+ } else {
+ if (error) {
+ *error = "\\U must be followed by 8 hex digits: \\" +
+ std::string(hex_start, p + 1 - hex_start);
+ }
+ return false;
+ }
+ }
+ if ((rune == 0) && leave_nulls_escaped) {
+ // Copy the escape sequence for the null character
+ *d++ = '\\';
+ memmove(d, hex_start, 9); // U00000000
+ d += 9;
+ break;
+ }
+ if (IsSurrogate(rune, absl::string_view(hex_start, 9), error)) {
+ return false;
+ }
+ d += strings_internal::EncodeUTF8Char(d, rune);
+ break;
+ }
+ default: {
+ if (error) *error = std::string("Unknown escape sequence: \\") + *p;
+ return false;
+ }
+ }
+ p++; // read past letter we escaped
+ }
+ }
+ *dest_len = d - dest;
+ return true;
+}
+
+// ----------------------------------------------------------------------
+// CUnescapeInternal()
+//
+// Same as above but uses a std::string for output. 'source' and 'dest'
+// may be the same.
+// ----------------------------------------------------------------------
+bool CUnescapeInternal(absl::string_view source, bool leave_nulls_escaped,
+ std::string* dest, std::string* error) {
+ strings_internal::STLStringResizeUninitialized(dest, source.size());
+
+ ptrdiff_t dest_size;
+ if (!CUnescapeInternal(source,
+ leave_nulls_escaped,
+ &(*dest)[0],
+ &dest_size,
+ error)) {
+ return false;
+ }
+ dest->erase(dest_size);
+ return true;
+}
+
+// ----------------------------------------------------------------------
+// CEscape()
+// CHexEscape()
+// Utf8SafeCEscape()
+// Utf8SafeCHexEscape()
+// Escapes 'src' using C-style escape sequences. This is useful for
+// preparing query flags. The 'Hex' version uses hexadecimal rather than
+// octal sequences. The 'Utf8Safe' version does not touch UTF-8 bytes.
+//
+// Escaped chars: \n, \r, \t, ", ', \, and !absl::ascii_isprint().
+// ----------------------------------------------------------------------
+std::string CEscapeInternal(absl::string_view src, bool use_hex,
+ bool utf8_safe) {
+ std::string dest;
+ bool last_hex_escape = false; // true if last output char was \xNN.
+
+ for (unsigned char c : src) {
+ bool is_hex_escape = false;
+ switch (c) {
+ case '\n': dest.append("\\" "n"); break;
+ case '\r': dest.append("\\" "r"); break;
+ case '\t': dest.append("\\" "t"); break;
+ case '\"': dest.append("\\" "\""); break;
+ case '\'': dest.append("\\" "'"); break;
+ case '\\': dest.append("\\" "\\"); break;
+ default:
+ // Note that if we emit \xNN and the src character after that is a hex
+ // digit then that digit must be escaped too to prevent it being
+ // interpreted as part of the character code by C.
+ if ((!utf8_safe || c < 0x80) &&
+ (!absl::ascii_isprint(c) ||
+ (last_hex_escape && absl::ascii_isxdigit(c)))) {
+ if (use_hex) {
+ dest.append("\\" "x");
+ dest.push_back(numbers_internal::kHexChar[c / 16]);
+ dest.push_back(numbers_internal::kHexChar[c % 16]);
+ is_hex_escape = true;
+ } else {
+ dest.append("\\");
+ dest.push_back(numbers_internal::kHexChar[c / 64]);
+ dest.push_back(numbers_internal::kHexChar[(c % 64) / 8]);
+ dest.push_back(numbers_internal::kHexChar[c % 8]);
+ }
+ } else {
+ dest.push_back(c);
+ break;
+ }
+ }
+ last_hex_escape = is_hex_escape;
+ }
+
+ return dest;
+}
+
+/* clang-format off */
+constexpr char c_escaped_len[256] = {
+ 4, 4, 4, 4, 4, 4, 4, 4, 4, 2, 2, 4, 4, 2, 4, 4, // \t, \n, \r
+ 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+ 1, 1, 2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, // ", '
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // '0'..'9'
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 'A'..'O'
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, // 'P'..'Z', '\'
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 'a'..'o'
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 4, // 'p'..'z', DEL
+ 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+ 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+ 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+ 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+ 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+ 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+ 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+ 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+};
+/* clang-format on */
+
+// Calculates the length of the C-style escaped version of 'src'.
+// Assumes that non-printable characters are escaped using octal sequences, and
+// that UTF-8 bytes are not handled specially.
+inline size_t CEscapedLength(absl::string_view src) {
+ size_t escaped_len = 0;
+ for (unsigned char c : src) escaped_len += c_escaped_len[c];
+ return escaped_len;
+}
+
+void CEscapeAndAppendInternal(absl::string_view src, std::string* dest) {
+ size_t escaped_len = CEscapedLength(src);
+ if (escaped_len == src.size()) {
+ dest->append(src.data(), src.size());
+ return;
+ }
+
+ size_t cur_dest_len = dest->size();
+ strings_internal::STLStringResizeUninitialized(dest,
+ cur_dest_len + escaped_len);
+ char* append_ptr = &(*dest)[cur_dest_len];
+
+ for (unsigned char c : src) {
+ int char_len = c_escaped_len[c];
+ if (char_len == 1) {
+ *append_ptr++ = c;
+ } else if (char_len == 2) {
+ switch (c) {
+ case '\n':
+ *append_ptr++ = '\\';
+ *append_ptr++ = 'n';
+ break;
+ case '\r':
+ *append_ptr++ = '\\';
+ *append_ptr++ = 'r';
+ break;
+ case '\t':
+ *append_ptr++ = '\\';
+ *append_ptr++ = 't';
+ break;
+ case '\"':
+ *append_ptr++ = '\\';
+ *append_ptr++ = '\"';
+ break;
+ case '\'':
+ *append_ptr++ = '\\';
+ *append_ptr++ = '\'';
+ break;
+ case '\\':
+ *append_ptr++ = '\\';
+ *append_ptr++ = '\\';
+ break;
+ }
+ } else {
+ *append_ptr++ = '\\';
+ *append_ptr++ = '0' + c / 64;
+ *append_ptr++ = '0' + (c % 64) / 8;
+ *append_ptr++ = '0' + c % 8;
+ }
+ }
+}
+
+bool Base64UnescapeInternal(const char* src_param, size_t szsrc, char* dest,
+ size_t szdest, const signed char* unbase64,
+ size_t* len) {
+ static const char kPad64Equals = '=';
+ static const char kPad64Dot = '.';
+
+ size_t destidx = 0;
+ int decode = 0;
+ int state = 0;
+ unsigned int ch = 0;
+ unsigned int temp = 0;
+
+ // If "char" is signed by default, using *src as an array index results in
+ // accessing negative array elements. Treat the input as a pointer to
+ // unsigned char to avoid this.
+ const unsigned char* src = reinterpret_cast<const unsigned char*>(src_param);
+
+ // The GET_INPUT macro gets the next input character, skipping
+ // over any whitespace, and stopping when we reach the end of the
+ // string or when we read any non-data character. The arguments are
+ // an arbitrary identifier (used as a label for goto) and the number
+ // of data bytes that must remain in the input to avoid aborting the
+ // loop.
+#define GET_INPUT(label, remain) \
+ label: \
+ --szsrc; \
+ ch = *src++; \
+ decode = unbase64[ch]; \
+ if (decode < 0) { \
+ if (absl::ascii_isspace(ch) && szsrc >= remain) goto label; \
+ state = 4 - remain; \
+ break; \
+ }
+
+ // if dest is null, we're just checking to see if it's legal input
+ // rather than producing output. (I suspect this could just be done
+ // with a regexp...). We duplicate the loop so this test can be
+ // outside it instead of in every iteration.
+
+ if (dest) {
+ // This loop consumes 4 input bytes and produces 3 output bytes
+ // per iteration. We can't know at the start that there is enough
+ // data left in the string for a full iteration, so the loop may
+ // break out in the middle; if so 'state' will be set to the
+ // number of input bytes read.
+
+ while (szsrc >= 4) {
+ // We'll start by optimistically assuming that the next four
+ // bytes of the string (src[0..3]) are four good data bytes
+ // (that is, no nulls, whitespace, padding chars, or illegal
+ // chars). We need to test src[0..2] for nulls individually
+ // before constructing temp to preserve the property that we
+ // never read past a null in the string (no matter how long
+ // szsrc claims the string is).
+
+ if (!src[0] || !src[1] || !src[2] ||
+ ((temp = ((unsigned(unbase64[src[0]]) << 18) |
+ (unsigned(unbase64[src[1]]) << 12) |
+ (unsigned(unbase64[src[2]]) << 6) |
+ (unsigned(unbase64[src[3]])))) &
+ 0x80000000)) {
+ // Iff any of those four characters was bad (null, illegal,
+ // whitespace, padding), then temp's high bit will be set
+ // (because unbase64[] is -1 for all bad characters).
+ //
+ // We'll back up and resort to the slower decoder, which knows
+ // how to handle those cases.
+
+ GET_INPUT(first, 4);
+ temp = decode;
+ GET_INPUT(second, 3);
+ temp = (temp << 6) | decode;
+ GET_INPUT(third, 2);
+ temp = (temp << 6) | decode;
+ GET_INPUT(fourth, 1);
+ temp = (temp << 6) | decode;
+ } else {
+ // We really did have four good data bytes, so advance four
+ // characters in the string.
+
+ szsrc -= 4;
+ src += 4;
+ }
+
+ // temp has 24 bits of input, so write that out as three bytes.
+
+ if (destidx + 3 > szdest) return false;
+ dest[destidx + 2] = temp;
+ temp >>= 8;
+ dest[destidx + 1] = temp;
+ temp >>= 8;
+ dest[destidx] = temp;
+ destidx += 3;
+ }
+ } else {
+ while (szsrc >= 4) {
+ if (!src[0] || !src[1] || !src[2] ||
+ ((temp = ((unsigned(unbase64[src[0]]) << 18) |
+ (unsigned(unbase64[src[1]]) << 12) |
+ (unsigned(unbase64[src[2]]) << 6) |
+ (unsigned(unbase64[src[3]])))) &
+ 0x80000000)) {
+ GET_INPUT(first_no_dest, 4);
+ GET_INPUT(second_no_dest, 3);
+ GET_INPUT(third_no_dest, 2);
+ GET_INPUT(fourth_no_dest, 1);
+ } else {
+ szsrc -= 4;
+ src += 4;
+ }
+ destidx += 3;
+ }
+ }
+
+#undef GET_INPUT
+
+ // if the loop terminated because we read a bad character, return
+ // now.
+ if (decode < 0 && ch != kPad64Equals && ch != kPad64Dot &&
+ !absl::ascii_isspace(ch))
+ return false;
+
+ if (ch == kPad64Equals || ch == kPad64Dot) {
+ // if we stopped by hitting an '=' or '.', un-read that character -- we'll
+ // look at it again when we count to check for the proper number of
+ // equals signs at the end.
+ ++szsrc;
+ --src;
+ } else {
+ // This loop consumes 1 input byte per iteration. It's used to
+ // clean up the 0-3 input bytes remaining when the first, faster
+ // loop finishes. 'temp' contains the data from 'state' input
+ // characters read by the first loop.
+ while (szsrc > 0) {
+ --szsrc;
+ ch = *src++;
+ decode = unbase64[ch];
+ if (decode < 0) {
+ if (absl::ascii_isspace(ch)) {
+ continue;
+ } else if (ch == kPad64Equals || ch == kPad64Dot) {
+ // back up one character; we'll read it again when we check
+ // for the correct number of pad characters at the end.
+ ++szsrc;
+ --src;
+ break;
+ } else {
+ return false;
+ }
+ }
+
+ // Each input character gives us six bits of output.
+ temp = (temp << 6) | decode;
+ ++state;
+ if (state == 4) {
+ // If we've accumulated 24 bits of output, write that out as
+ // three bytes.
+ if (dest) {
+ if (destidx + 3 > szdest) return false;
+ dest[destidx + 2] = temp;
+ temp >>= 8;
+ dest[destidx + 1] = temp;
+ temp >>= 8;
+ dest[destidx] = temp;
+ }
+ destidx += 3;
+ state = 0;
+ temp = 0;
+ }
+ }
+ }
+
+ // Process the leftover data contained in 'temp' at the end of the input.
+ int expected_equals = 0;
+ switch (state) {
+ case 0:
+ // Nothing left over; output is a multiple of 3 bytes.
+ break;
+
+ case 1:
+ // Bad input; we have 6 bits left over.
+ return false;
+
+ case 2:
+ // Produce one more output byte from the 12 input bits we have left.
+ if (dest) {
+ if (destidx + 1 > szdest) return false;
+ temp >>= 4;
+ dest[destidx] = temp;
+ }
+ ++destidx;
+ expected_equals = 2;
+ break;
+
+ case 3:
+ // Produce two more output bytes from the 18 input bits we have left.
+ if (dest) {
+ if (destidx + 2 > szdest) return false;
+ temp >>= 2;
+ dest[destidx + 1] = temp;
+ temp >>= 8;
+ dest[destidx] = temp;
+ }
+ destidx += 2;
+ expected_equals = 1;
+ break;
+
+ default:
+ // state should have no other values at this point.
+ ABSL_RAW_LOG(FATAL, "This can't happen; base64 decoder state = %d",
+ state);
+ }
+
+ // The remainder of the string should be all whitespace, mixed with
+ // exactly 0 equals signs, or exactly 'expected_equals' equals
+ // signs. (Always accepting 0 equals signs is an Abseil extension
+ // not covered in the RFC, as is accepting dot as the pad character.)
+
+ int equals = 0;
+ while (szsrc > 0) {
+ if (*src == kPad64Equals || *src == kPad64Dot)
+ ++equals;
+ else if (!absl::ascii_isspace(*src))
+ return false;
+ --szsrc;
+ ++src;
+ }
+
+ const bool ok = (equals == 0 || equals == expected_equals);
+ if (ok) *len = destidx;
+ return ok;
+}
+
+// The arrays below were generated by the following code
+// #include <sys/time.h>
+// #include <stdlib.h>
+// #include <string.h>
+// main()
+// {
+// static const char Base64[] =
+// "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+// char* pos;
+// int idx, i, j;
+// printf(" ");
+// for (i = 0; i < 255; i += 8) {
+// for (j = i; j < i + 8; j++) {
+// pos = strchr(Base64, j);
+// if ((pos == nullptr) || (j == 0))
+// idx = -1;
+// else
+// idx = pos - Base64;
+// if (idx == -1)
+// printf(" %2d, ", idx);
+// else
+// printf(" %2d/*%c*/,", idx, j);
+// }
+// printf("\n ");
+// }
+// }
+//
+// where the value of "Base64[]" was replaced by one of the base-64 conversion
+// tables from the functions below.
+/* clang-format off */
+constexpr signed char kUnBase64[] = {
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, 62/*+*/, -1, -1, -1, 63/*/ */,
+ 52/*0*/, 53/*1*/, 54/*2*/, 55/*3*/, 56/*4*/, 57/*5*/, 58/*6*/, 59/*7*/,
+ 60/*8*/, 61/*9*/, -1, -1, -1, -1, -1, -1,
+ -1, 0/*A*/, 1/*B*/, 2/*C*/, 3/*D*/, 4/*E*/, 5/*F*/, 6/*G*/,
+ 07/*H*/, 8/*I*/, 9/*J*/, 10/*K*/, 11/*L*/, 12/*M*/, 13/*N*/, 14/*O*/,
+ 15/*P*/, 16/*Q*/, 17/*R*/, 18/*S*/, 19/*T*/, 20/*U*/, 21/*V*/, 22/*W*/,
+ 23/*X*/, 24/*Y*/, 25/*Z*/, -1, -1, -1, -1, -1,
+ -1, 26/*a*/, 27/*b*/, 28/*c*/, 29/*d*/, 30/*e*/, 31/*f*/, 32/*g*/,
+ 33/*h*/, 34/*i*/, 35/*j*/, 36/*k*/, 37/*l*/, 38/*m*/, 39/*n*/, 40/*o*/,
+ 41/*p*/, 42/*q*/, 43/*r*/, 44/*s*/, 45/*t*/, 46/*u*/, 47/*v*/, 48/*w*/,
+ 49/*x*/, 50/*y*/, 51/*z*/, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1
+};
+
+constexpr signed char kUnWebSafeBase64[] = {
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, 62/*-*/, -1, -1,
+ 52/*0*/, 53/*1*/, 54/*2*/, 55/*3*/, 56/*4*/, 57/*5*/, 58/*6*/, 59/*7*/,
+ 60/*8*/, 61/*9*/, -1, -1, -1, -1, -1, -1,
+ -1, 0/*A*/, 1/*B*/, 2/*C*/, 3/*D*/, 4/*E*/, 5/*F*/, 6/*G*/,
+ 07/*H*/, 8/*I*/, 9/*J*/, 10/*K*/, 11/*L*/, 12/*M*/, 13/*N*/, 14/*O*/,
+ 15/*P*/, 16/*Q*/, 17/*R*/, 18/*S*/, 19/*T*/, 20/*U*/, 21/*V*/, 22/*W*/,
+ 23/*X*/, 24/*Y*/, 25/*Z*/, -1, -1, -1, -1, 63/*_*/,
+ -1, 26/*a*/, 27/*b*/, 28/*c*/, 29/*d*/, 30/*e*/, 31/*f*/, 32/*g*/,
+ 33/*h*/, 34/*i*/, 35/*j*/, 36/*k*/, 37/*l*/, 38/*m*/, 39/*n*/, 40/*o*/,
+ 41/*p*/, 42/*q*/, 43/*r*/, 44/*s*/, 45/*t*/, 46/*u*/, 47/*v*/, 48/*w*/,
+ 49/*x*/, 50/*y*/, 51/*z*/, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1
+};
+/* clang-format on */
+
+constexpr char kWebSafeBase64Chars[] =
+ "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_";
+
+template <typename String>
+bool Base64UnescapeInternal(const char* src, size_t slen, String* dest,
+ const signed char* unbase64) {
+ // Determine the size of the output string. Base64 encodes every 3 bytes into
+ // 4 characters. any leftover chars are added directly for good measure.
+ // This is documented in the base64 RFC: http://tools.ietf.org/html/rfc3548
+ const size_t dest_len = 3 * (slen / 4) + (slen % 4);
+
+ strings_internal::STLStringResizeUninitialized(dest, dest_len);
+
+ // We are getting the destination buffer by getting the beginning of the
+ // string and converting it into a char *.
+ size_t len;
+ const bool ok =
+ Base64UnescapeInternal(src, slen, &(*dest)[0], dest_len, unbase64, &len);
+ if (!ok) {
+ dest->clear();
+ return false;
+ }
+
+ // could be shorter if there was padding
+ assert(len <= dest_len);
+ dest->erase(len);
+
+ return true;
+}
+
+/* clang-format off */
+constexpr char kHexValueLenient[256] = {
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 0, 0, 0, 0, 0, // '0'..'9'
+ 0, 10, 11, 12, 13, 14, 15, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 'A'..'F'
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 10, 11, 12, 13, 14, 15, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 'a'..'f'
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+};
+
+/* clang-format on */
+
+// This is a templated function so that T can be either a char*
+// or a string. This works because we use the [] operator to access
+// individual characters at a time.
+template <typename T>
+void HexStringToBytesInternal(const char* from, T to, ptrdiff_t num) {
+ for (int i = 0; i < num; i++) {
+ to[i] = (kHexValueLenient[from[i * 2] & 0xFF] << 4) +
+ (kHexValueLenient[from[i * 2 + 1] & 0xFF]);
+ }
+}
+
+// This is a templated function so that T can be either a char* or a
+// std::string.
+template <typename T>
+void BytesToHexStringInternal(const unsigned char* src, T dest, ptrdiff_t num) {
+ auto dest_ptr = &dest[0];
+ for (auto src_ptr = src; src_ptr != (src + num); ++src_ptr, dest_ptr += 2) {
+ const char* hex_p = &numbers_internal::kHexTable[*src_ptr * 2];
+ std::copy(hex_p, hex_p + 2, dest_ptr);
+ }
+}
+
+} // namespace
+
+// ----------------------------------------------------------------------
+// CUnescape()
+//
+// See CUnescapeInternal() for implementation details.
+// ----------------------------------------------------------------------
+bool CUnescape(absl::string_view source, std::string* dest,
+ std::string* error) {
+ return CUnescapeInternal(source, kUnescapeNulls, dest, error);
+}
+
+std::string CEscape(absl::string_view src) {
+ std::string dest;
+ CEscapeAndAppendInternal(src, &dest);
+ return dest;
+}
+
+std::string CHexEscape(absl::string_view src) {
+ return CEscapeInternal(src, true, false);
+}
+
+std::string Utf8SafeCEscape(absl::string_view src) {
+ return CEscapeInternal(src, false, true);
+}
+
+std::string Utf8SafeCHexEscape(absl::string_view src) {
+ return CEscapeInternal(src, true, true);
+}
+
+// ----------------------------------------------------------------------
+// Base64Unescape() - base64 decoder
+// Base64Escape() - base64 encoder
+// WebSafeBase64Unescape() - Google's variation of base64 decoder
+// WebSafeBase64Escape() - Google's variation of base64 encoder
+//
+// Check out
+// http://tools.ietf.org/html/rfc2045 for formal description, but what we
+// care about is that...
+// Take the encoded stuff in groups of 4 characters and turn each
+// character into a code 0 to 63 thus:
+// A-Z map to 0 to 25
+// a-z map to 26 to 51
+// 0-9 map to 52 to 61
+// +(- for WebSafe) maps to 62
+// /(_ for WebSafe) maps to 63
+// There will be four numbers, all less than 64 which can be represented
+// by a 6 digit binary number (aaaaaa, bbbbbb, cccccc, dddddd respectively).
+// Arrange the 6 digit binary numbers into three bytes as such:
+// aaaaaabb bbbbcccc ccdddddd
+// Equals signs (one or two) are used at the end of the encoded block to
+// indicate that the text was not an integer multiple of three bytes long.
+// ----------------------------------------------------------------------
+
+bool Base64Unescape(absl::string_view src, std::string* dest) {
+ return Base64UnescapeInternal(src.data(), src.size(), dest, kUnBase64);
+}
+
+bool WebSafeBase64Unescape(absl::string_view src, std::string* dest) {
+ return Base64UnescapeInternal(src.data(), src.size(), dest, kUnWebSafeBase64);
+}
+
+void Base64Escape(absl::string_view src, std::string* dest) {
+ strings_internal::Base64EscapeInternal(
+ reinterpret_cast<const unsigned char*>(src.data()), src.size(), dest,
+ true, strings_internal::kBase64Chars);
+}
+
+void WebSafeBase64Escape(absl::string_view src, std::string* dest) {
+ strings_internal::Base64EscapeInternal(
+ reinterpret_cast<const unsigned char*>(src.data()), src.size(), dest,
+ false, kWebSafeBase64Chars);
+}
+
+std::string Base64Escape(absl::string_view src) {
+ std::string dest;
+ strings_internal::Base64EscapeInternal(
+ reinterpret_cast<const unsigned char*>(src.data()), src.size(), &dest,
+ true, strings_internal::kBase64Chars);
+ return dest;
+}
+
+std::string WebSafeBase64Escape(absl::string_view src) {
+ std::string dest;
+ strings_internal::Base64EscapeInternal(
+ reinterpret_cast<const unsigned char*>(src.data()), src.size(), &dest,
+ false, kWebSafeBase64Chars);
+ return dest;
+}
+
+std::string HexStringToBytes(absl::string_view from) {
+ std::string result;
+ const auto num = from.size() / 2;
+ strings_internal::STLStringResizeUninitialized(&result, num);
+ absl::HexStringToBytesInternal<std::string&>(from.data(), result, num);
+ return result;
+}
+
+std::string BytesToHexString(absl::string_view from) {
+ std::string result;
+ strings_internal::STLStringResizeUninitialized(&result, 2 * from.size());
+ absl::BytesToHexStringInternal<std::string&>(
+ reinterpret_cast<const unsigned char*>(from.data()), result, from.size());
+ return result;
+}
+
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/strings/escaping.h b/third_party/abseil/src/absl/strings/escaping.h
new file mode 100644
index 0000000..f5ca26c
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/escaping.h
@@ -0,0 +1,164 @@
+//
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: escaping.h
+// -----------------------------------------------------------------------------
+//
+// This header file contains string utilities involved in escaping and
+// unescaping strings in various ways.
+
+#ifndef ABSL_STRINGS_ESCAPING_H_
+#define ABSL_STRINGS_ESCAPING_H_
+
+#include <cstddef>
+#include <string>
+#include <vector>
+
+#include "absl/base/macros.h"
+#include "absl/strings/ascii.h"
+#include "absl/strings/str_join.h"
+#include "absl/strings/string_view.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+// CUnescape()
+//
+// Unescapes a `source` string and copies it into `dest`, rewriting C-style
+// escape sequences (https://en.cppreference.com/w/cpp/language/escape) into
+// their proper code point equivalents, returning `true` if successful.
+//
+// The following unescape sequences can be handled:
+//
+// * ASCII escape sequences ('\n','\r','\\', etc.) to their ASCII equivalents
+// * Octal escape sequences ('\nnn') to byte nnn. The unescaped value must
+// resolve to a single byte or an error will occur. E.g. values greater than
+// 0xff will produce an error.
+// * Hexadecimal escape sequences ('\xnn') to byte nn. While an arbitrary
+// number of following digits are allowed, the unescaped value must resolve
+// to a single byte or an error will occur. E.g. '\x0045' is equivalent to
+// '\x45', but '\x1234' will produce an error.
+// * Unicode escape sequences ('\unnnn' for exactly four hex digits or
+// '\Unnnnnnnn' for exactly eight hex digits, which will be encoded in
+// UTF-8. (E.g., `\u2019` unescapes to the three bytes 0xE2, 0x80, and
+// 0x99).
+//
+// If any errors are encountered, this function returns `false`, leaving the
+// `dest` output parameter in an unspecified state, and stores the first
+// encountered error in `error`. To disable error reporting, set `error` to
+// `nullptr` or use the overload with no error reporting below.
+//
+// Example:
+//
+// std::string s = "foo\\rbar\\nbaz\\t";
+// std::string unescaped_s;
+// if (!absl::CUnescape(s, &unescaped_s) {
+// ...
+// }
+// EXPECT_EQ(unescaped_s, "foo\rbar\nbaz\t");
+bool CUnescape(absl::string_view source, std::string* dest, std::string* error);
+
+// Overload of `CUnescape()` with no error reporting.
+inline bool CUnescape(absl::string_view source, std::string* dest) {
+ return CUnescape(source, dest, nullptr);
+}
+
+// CEscape()
+//
+// Escapes a 'src' string using C-style escapes sequences
+// (https://en.cppreference.com/w/cpp/language/escape), escaping other
+// non-printable/non-whitespace bytes as octal sequences (e.g. "\377").
+//
+// Example:
+//
+// std::string s = "foo\rbar\tbaz\010\011\012\013\014\x0d\n";
+// std::string escaped_s = absl::CEscape(s);
+// EXPECT_EQ(escaped_s, "foo\\rbar\\tbaz\\010\\t\\n\\013\\014\\r\\n");
+std::string CEscape(absl::string_view src);
+
+// CHexEscape()
+//
+// Escapes a 'src' string using C-style escape sequences, escaping
+// other non-printable/non-whitespace bytes as hexadecimal sequences (e.g.
+// "\xFF").
+//
+// Example:
+//
+// std::string s = "foo\rbar\tbaz\010\011\012\013\014\x0d\n";
+// std::string escaped_s = absl::CHexEscape(s);
+// EXPECT_EQ(escaped_s, "foo\\rbar\\tbaz\\x08\\t\\n\\x0b\\x0c\\r\\n");
+std::string CHexEscape(absl::string_view src);
+
+// Utf8SafeCEscape()
+//
+// Escapes a 'src' string using C-style escape sequences, escaping bytes as
+// octal sequences, and passing through UTF-8 characters without conversion.
+// I.e., when encountering any bytes with their high bit set, this function
+// will not escape those values, whether or not they are valid UTF-8.
+std::string Utf8SafeCEscape(absl::string_view src);
+
+// Utf8SafeCHexEscape()
+//
+// Escapes a 'src' string using C-style escape sequences, escaping bytes as
+// hexadecimal sequences, and passing through UTF-8 characters without
+// conversion.
+std::string Utf8SafeCHexEscape(absl::string_view src);
+
+// Base64Unescape()
+//
+// Converts a `src` string encoded in Base64 to its binary equivalent, writing
+// it to a `dest` buffer, returning `true` on success. If `src` contains invalid
+// characters, `dest` is cleared and returns `false`.
+bool Base64Unescape(absl::string_view src, std::string* dest);
+
+// WebSafeBase64Unescape()
+//
+// Converts a `src` string encoded in Base64 to its binary equivalent, writing
+// it to a `dest` buffer, but using '-' instead of '+', and '_' instead of '/'.
+// If `src` contains invalid characters, `dest` is cleared and returns `false`.
+bool WebSafeBase64Unescape(absl::string_view src, std::string* dest);
+
+// Base64Escape()
+//
+// Encodes a `src` string into a base64-encoded string, with padding characters.
+// This function conforms with RFC 4648 section 4 (base64).
+void Base64Escape(absl::string_view src, std::string* dest);
+std::string Base64Escape(absl::string_view src);
+
+// WebSafeBase64Escape()
+//
+// Encodes a `src` string into a base64-like string, using '-' instead of '+'
+// and '_' instead of '/', and without padding. This function conforms with RFC
+// 4648 section 5 (base64url).
+void WebSafeBase64Escape(absl::string_view src, std::string* dest);
+std::string WebSafeBase64Escape(absl::string_view src);
+
+// HexStringToBytes()
+//
+// Converts an ASCII hex string into bytes, returning binary data of length
+// `from.size()/2`.
+std::string HexStringToBytes(absl::string_view from);
+
+// BytesToHexString()
+//
+// Converts binary data into an ASCII text string, returning a string of size
+// `2*from.size()`.
+std::string BytesToHexString(absl::string_view from);
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_STRINGS_ESCAPING_H_
diff --git a/third_party/abseil/src/absl/strings/escaping_benchmark.cc b/third_party/abseil/src/absl/strings/escaping_benchmark.cc
new file mode 100644
index 0000000..10d5b03
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/escaping_benchmark.cc
@@ -0,0 +1,94 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/strings/escaping.h"
+
+#include <cstdio>
+#include <cstring>
+#include <random>
+
+#include "benchmark/benchmark.h"
+#include "absl/base/internal/raw_logging.h"
+#include "absl/strings/internal/escaping_test_common.h"
+
+namespace {
+
+void BM_CUnescapeHexString(benchmark::State& state) {
+ std::string src;
+ for (int i = 0; i < 50; i++) {
+ src += "\\x55";
+ }
+ std::string dest;
+ for (auto _ : state) {
+ absl::CUnescape(src, &dest);
+ }
+}
+BENCHMARK(BM_CUnescapeHexString);
+
+void BM_WebSafeBase64Escape_string(benchmark::State& state) {
+ std::string raw;
+ for (int i = 0; i < 10; ++i) {
+ for (const auto& test_set : absl::strings_internal::base64_strings()) {
+ raw += std::string(test_set.plaintext);
+ }
+ }
+
+ // The actual benchmark loop is tiny...
+ std::string escaped;
+ for (auto _ : state) {
+ absl::WebSafeBase64Escape(raw, &escaped);
+ }
+
+ // We want to be sure the compiler doesn't throw away the loop above,
+ // and the easiest way to ensure that is to round-trip the results and verify
+ // them.
+ std::string round_trip;
+ absl::WebSafeBase64Unescape(escaped, &round_trip);
+ ABSL_RAW_CHECK(round_trip == raw, "");
+}
+BENCHMARK(BM_WebSafeBase64Escape_string);
+
+// Used for the CEscape benchmarks
+const char kStringValueNoEscape[] = "1234567890";
+const char kStringValueSomeEscaped[] = "123\n56789\xA1";
+const char kStringValueMostEscaped[] = "\xA1\xA2\ny\xA4\xA5\xA6z\b\r";
+
+void CEscapeBenchmarkHelper(benchmark::State& state, const char* string_value,
+ int max_len) {
+ std::string src;
+ while (src.size() < max_len) {
+ absl::StrAppend(&src, string_value);
+ }
+
+ for (auto _ : state) {
+ absl::CEscape(src);
+ }
+}
+
+void BM_CEscape_NoEscape(benchmark::State& state) {
+ CEscapeBenchmarkHelper(state, kStringValueNoEscape, state.range(0));
+}
+BENCHMARK(BM_CEscape_NoEscape)->Range(1, 1 << 14);
+
+void BM_CEscape_SomeEscaped(benchmark::State& state) {
+ CEscapeBenchmarkHelper(state, kStringValueSomeEscaped, state.range(0));
+}
+BENCHMARK(BM_CEscape_SomeEscaped)->Range(1, 1 << 14);
+
+void BM_CEscape_MostEscaped(benchmark::State& state) {
+ CEscapeBenchmarkHelper(state, kStringValueMostEscaped, state.range(0));
+}
+BENCHMARK(BM_CEscape_MostEscaped)->Range(1, 1 << 14);
+
+} // namespace
diff --git a/third_party/abseil/src/absl/strings/escaping_test.cc b/third_party/abseil/src/absl/strings/escaping_test.cc
new file mode 100644
index 0000000..45671a0
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/escaping_test.cc
@@ -0,0 +1,664 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/strings/escaping.h"
+
+#include <array>
+#include <cstdio>
+#include <cstring>
+#include <memory>
+#include <vector>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/container/fixed_array.h"
+#include "absl/strings/str_cat.h"
+
+#include "absl/strings/internal/escaping_test_common.h"
+
+namespace {
+
+struct epair {
+ std::string escaped;
+ std::string unescaped;
+};
+
+TEST(CEscape, EscapeAndUnescape) {
+ const std::string inputs[] = {
+ std::string("foo\nxx\r\b\0023"),
+ std::string(""),
+ std::string("abc"),
+ std::string("\1chad_rules"),
+ std::string("\1arnar_drools"),
+ std::string("xxxx\r\t'\"\\"),
+ std::string("\0xx\0", 4),
+ std::string("\x01\x31"),
+ std::string("abc\xb\x42\141bc"),
+ std::string("123\1\x31\x32\x33"),
+ std::string("\xc1\xca\x1b\x62\x19o\xcc\x04"),
+ std::string(
+ "\\\"\xe8\xb0\xb7\xe6\xad\x8c\\\" is Google\\\'s Chinese name"),
+ };
+ // Do this twice, once for octal escapes and once for hex escapes.
+ for (int kind = 0; kind < 4; kind++) {
+ for (const std::string& original : inputs) {
+ std::string escaped;
+ switch (kind) {
+ case 0:
+ escaped = absl::CEscape(original);
+ break;
+ case 1:
+ escaped = absl::CHexEscape(original);
+ break;
+ case 2:
+ escaped = absl::Utf8SafeCEscape(original);
+ break;
+ case 3:
+ escaped = absl::Utf8SafeCHexEscape(original);
+ break;
+ }
+ std::string unescaped_str;
+ EXPECT_TRUE(absl::CUnescape(escaped, &unescaped_str));
+ EXPECT_EQ(unescaped_str, original);
+
+ unescaped_str.erase();
+ std::string error;
+ EXPECT_TRUE(absl::CUnescape(escaped, &unescaped_str, &error));
+ EXPECT_EQ(error, "");
+
+ // Check in-place unescaping
+ std::string s = escaped;
+ EXPECT_TRUE(absl::CUnescape(s, &s));
+ ASSERT_EQ(s, original);
+ }
+ }
+ // Check that all possible two character strings can be escaped then
+ // unescaped successfully.
+ for (int char0 = 0; char0 < 256; char0++) {
+ for (int char1 = 0; char1 < 256; char1++) {
+ char chars[2];
+ chars[0] = char0;
+ chars[1] = char1;
+ std::string s(chars, 2);
+ std::string escaped = absl::CHexEscape(s);
+ std::string unescaped;
+ EXPECT_TRUE(absl::CUnescape(escaped, &unescaped));
+ EXPECT_EQ(s, unescaped);
+ }
+ }
+}
+
+TEST(CEscape, BasicEscaping) {
+ epair oct_values[] = {
+ {"foo\\rbar\\nbaz\\t", "foo\rbar\nbaz\t"},
+ {"\\'full of \\\"sound\\\" and \\\"fury\\\"\\'",
+ "'full of \"sound\" and \"fury\"'"},
+ {"signi\\\\fying\\\\ nothing\\\\", "signi\\fying\\ nothing\\"},
+ {"\\010\\t\\n\\013\\014\\r", "\010\011\012\013\014\015"}
+ };
+ epair hex_values[] = {
+ {"ubik\\rubik\\nubik\\t", "ubik\rubik\nubik\t"},
+ {"I\\\'ve just seen a \\\"face\\\"",
+ "I've just seen a \"face\""},
+ {"hel\\\\ter\\\\skel\\\\ter\\\\", "hel\\ter\\skel\\ter\\"},
+ {"\\x08\\t\\n\\x0b\\x0c\\r", "\010\011\012\013\014\015"}
+ };
+ epair utf8_oct_values[] = {
+ {"\xe8\xb0\xb7\xe6\xad\x8c\\r\xe8\xb0\xb7\xe6\xad\x8c\\nbaz\\t",
+ "\xe8\xb0\xb7\xe6\xad\x8c\r\xe8\xb0\xb7\xe6\xad\x8c\nbaz\t"},
+ {"\\\"\xe8\xb0\xb7\xe6\xad\x8c\\\" is Google\\\'s Chinese name",
+ "\"\xe8\xb0\xb7\xe6\xad\x8c\" is Google\'s Chinese name"},
+ {"\xe3\x83\xa1\xe3\x83\xbc\xe3\x83\xab\\\\are\\\\Japanese\\\\chars\\\\",
+ "\xe3\x83\xa1\xe3\x83\xbc\xe3\x83\xab\\are\\Japanese\\chars\\"},
+ {"\xed\x81\xac\xeb\xa1\xac\\010\\t\\n\\013\\014\\r",
+ "\xed\x81\xac\xeb\xa1\xac\010\011\012\013\014\015"}
+ };
+ epair utf8_hex_values[] = {
+ {"\x20\xe4\xbd\xa0\\t\xe5\xa5\xbd,\\r!\\n",
+ "\x20\xe4\xbd\xa0\t\xe5\xa5\xbd,\r!\n"},
+ {"\xe8\xa9\xa6\xe9\xa8\x93\\\' means \\\"test\\\"",
+ "\xe8\xa9\xa6\xe9\xa8\x93\' means \"test\""},
+ {"\\\\\xe6\x88\x91\\\\:\\\\\xe6\x9d\xa8\xe6\xac\xa2\\\\",
+ "\\\xe6\x88\x91\\:\\\xe6\x9d\xa8\xe6\xac\xa2\\"},
+ {"\xed\x81\xac\xeb\xa1\xac\\x08\\t\\n\\x0b\\x0c\\r",
+ "\xed\x81\xac\xeb\xa1\xac\010\011\012\013\014\015"}
+ };
+
+ for (const epair& val : oct_values) {
+ std::string escaped = absl::CEscape(val.unescaped);
+ EXPECT_EQ(escaped, val.escaped);
+ }
+ for (const epair& val : hex_values) {
+ std::string escaped = absl::CHexEscape(val.unescaped);
+ EXPECT_EQ(escaped, val.escaped);
+ }
+ for (const epair& val : utf8_oct_values) {
+ std::string escaped = absl::Utf8SafeCEscape(val.unescaped);
+ EXPECT_EQ(escaped, val.escaped);
+ }
+ for (const epair& val : utf8_hex_values) {
+ std::string escaped = absl::Utf8SafeCHexEscape(val.unescaped);
+ EXPECT_EQ(escaped, val.escaped);
+ }
+}
+
+TEST(Unescape, BasicFunction) {
+ epair tests[] =
+ {{"", ""},
+ {"\\u0030", "0"},
+ {"\\u00A3", "\xC2\xA3"},
+ {"\\u22FD", "\xE2\x8B\xBD"},
+ {"\\U00010000", "\xF0\x90\x80\x80"},
+ {"\\U0010FFFD", "\xF4\x8F\xBF\xBD"}};
+ for (const epair& val : tests) {
+ std::string out;
+ EXPECT_TRUE(absl::CUnescape(val.escaped, &out));
+ EXPECT_EQ(out, val.unescaped);
+ }
+ std::string bad[] = {"\\u1", // too short
+ "\\U1", // too short
+ "\\Uffffff", // exceeds 0x10ffff (largest Unicode)
+ "\\U00110000", // exceeds 0x10ffff (largest Unicode)
+ "\\uD835", // surrogate character (D800-DFFF)
+ "\\U0000DD04", // surrogate character (D800-DFFF)
+ "\\777", // exceeds 0xff
+ "\\xABCD"}; // exceeds 0xff
+ for (const std::string& e : bad) {
+ std::string error;
+ std::string out;
+ EXPECT_FALSE(absl::CUnescape(e, &out, &error));
+ EXPECT_FALSE(error.empty());
+
+ out.erase();
+ EXPECT_FALSE(absl::CUnescape(e, &out));
+ }
+}
+
+class CUnescapeTest : public testing::Test {
+ protected:
+ static const char kStringWithMultipleOctalNulls[];
+ static const char kStringWithMultipleHexNulls[];
+ static const char kStringWithMultipleUnicodeNulls[];
+
+ std::string result_string_;
+};
+
+const char CUnescapeTest::kStringWithMultipleOctalNulls[] =
+ "\\0\\n" // null escape \0 plus newline
+ "0\\n" // just a number 0 (not a null escape) plus newline
+ "\\00\\12" // null escape \00 plus octal newline code
+ "\\000"; // null escape \000
+
+// This has the same ingredients as kStringWithMultipleOctalNulls
+// but with \x hex escapes instead of octal escapes.
+const char CUnescapeTest::kStringWithMultipleHexNulls[] =
+ "\\x0\\n"
+ "0\\n"
+ "\\x00\\xa"
+ "\\x000";
+
+const char CUnescapeTest::kStringWithMultipleUnicodeNulls[] =
+ "\\u0000\\n" // short-form (4-digit) null escape plus newline
+ "0\\n" // just a number 0 (not a null escape) plus newline
+ "\\U00000000"; // long-form (8-digit) null escape
+
+TEST_F(CUnescapeTest, Unescapes1CharOctalNull) {
+ std::string original_string = "\\0";
+ EXPECT_TRUE(absl::CUnescape(original_string, &result_string_));
+ EXPECT_EQ(std::string("\0", 1), result_string_);
+}
+
+TEST_F(CUnescapeTest, Unescapes2CharOctalNull) {
+ std::string original_string = "\\00";
+ EXPECT_TRUE(absl::CUnescape(original_string, &result_string_));
+ EXPECT_EQ(std::string("\0", 1), result_string_);
+}
+
+TEST_F(CUnescapeTest, Unescapes3CharOctalNull) {
+ std::string original_string = "\\000";
+ EXPECT_TRUE(absl::CUnescape(original_string, &result_string_));
+ EXPECT_EQ(std::string("\0", 1), result_string_);
+}
+
+TEST_F(CUnescapeTest, Unescapes1CharHexNull) {
+ std::string original_string = "\\x0";
+ EXPECT_TRUE(absl::CUnescape(original_string, &result_string_));
+ EXPECT_EQ(std::string("\0", 1), result_string_);
+}
+
+TEST_F(CUnescapeTest, Unescapes2CharHexNull) {
+ std::string original_string = "\\x00";
+ EXPECT_TRUE(absl::CUnescape(original_string, &result_string_));
+ EXPECT_EQ(std::string("\0", 1), result_string_);
+}
+
+TEST_F(CUnescapeTest, Unescapes3CharHexNull) {
+ std::string original_string = "\\x000";
+ EXPECT_TRUE(absl::CUnescape(original_string, &result_string_));
+ EXPECT_EQ(std::string("\0", 1), result_string_);
+}
+
+TEST_F(CUnescapeTest, Unescapes4CharUnicodeNull) {
+ std::string original_string = "\\u0000";
+ EXPECT_TRUE(absl::CUnescape(original_string, &result_string_));
+ EXPECT_EQ(std::string("\0", 1), result_string_);
+}
+
+TEST_F(CUnescapeTest, Unescapes8CharUnicodeNull) {
+ std::string original_string = "\\U00000000";
+ EXPECT_TRUE(absl::CUnescape(original_string, &result_string_));
+ EXPECT_EQ(std::string("\0", 1), result_string_);
+}
+
+TEST_F(CUnescapeTest, UnescapesMultipleOctalNulls) {
+ std::string original_string(kStringWithMultipleOctalNulls);
+ EXPECT_TRUE(absl::CUnescape(original_string, &result_string_));
+ // All escapes, including newlines and null escapes, should have been
+ // converted to the equivalent characters.
+ EXPECT_EQ(std::string("\0\n"
+ "0\n"
+ "\0\n"
+ "\0",
+ 7),
+ result_string_);
+}
+
+
+TEST_F(CUnescapeTest, UnescapesMultipleHexNulls) {
+ std::string original_string(kStringWithMultipleHexNulls);
+ EXPECT_TRUE(absl::CUnescape(original_string, &result_string_));
+ EXPECT_EQ(std::string("\0\n"
+ "0\n"
+ "\0\n"
+ "\0",
+ 7),
+ result_string_);
+}
+
+TEST_F(CUnescapeTest, UnescapesMultipleUnicodeNulls) {
+ std::string original_string(kStringWithMultipleUnicodeNulls);
+ EXPECT_TRUE(absl::CUnescape(original_string, &result_string_));
+ EXPECT_EQ(std::string("\0\n"
+ "0\n"
+ "\0",
+ 5),
+ result_string_);
+}
+
+static struct {
+ absl::string_view plaintext;
+ absl::string_view cyphertext;
+} const base64_tests[] = {
+ // Empty string.
+ {{"", 0}, {"", 0}},
+ {{nullptr, 0},
+ {"", 0}}, // if length is zero, plaintext ptr must be ignored!
+
+ // Basic bit patterns;
+ // values obtained with "echo -n '...' | uuencode -m test"
+
+ {{"\000", 1}, "AA=="},
+ {{"\001", 1}, "AQ=="},
+ {{"\002", 1}, "Ag=="},
+ {{"\004", 1}, "BA=="},
+ {{"\010", 1}, "CA=="},
+ {{"\020", 1}, "EA=="},
+ {{"\040", 1}, "IA=="},
+ {{"\100", 1}, "QA=="},
+ {{"\200", 1}, "gA=="},
+
+ {{"\377", 1}, "/w=="},
+ {{"\376", 1}, "/g=="},
+ {{"\375", 1}, "/Q=="},
+ {{"\373", 1}, "+w=="},
+ {{"\367", 1}, "9w=="},
+ {{"\357", 1}, "7w=="},
+ {{"\337", 1}, "3w=="},
+ {{"\277", 1}, "vw=="},
+ {{"\177", 1}, "fw=="},
+ {{"\000\000", 2}, "AAA="},
+ {{"\000\001", 2}, "AAE="},
+ {{"\000\002", 2}, "AAI="},
+ {{"\000\004", 2}, "AAQ="},
+ {{"\000\010", 2}, "AAg="},
+ {{"\000\020", 2}, "ABA="},
+ {{"\000\040", 2}, "ACA="},
+ {{"\000\100", 2}, "AEA="},
+ {{"\000\200", 2}, "AIA="},
+ {{"\001\000", 2}, "AQA="},
+ {{"\002\000", 2}, "AgA="},
+ {{"\004\000", 2}, "BAA="},
+ {{"\010\000", 2}, "CAA="},
+ {{"\020\000", 2}, "EAA="},
+ {{"\040\000", 2}, "IAA="},
+ {{"\100\000", 2}, "QAA="},
+ {{"\200\000", 2}, "gAA="},
+
+ {{"\377\377", 2}, "//8="},
+ {{"\377\376", 2}, "//4="},
+ {{"\377\375", 2}, "//0="},
+ {{"\377\373", 2}, "//s="},
+ {{"\377\367", 2}, "//c="},
+ {{"\377\357", 2}, "/+8="},
+ {{"\377\337", 2}, "/98="},
+ {{"\377\277", 2}, "/78="},
+ {{"\377\177", 2}, "/38="},
+ {{"\376\377", 2}, "/v8="},
+ {{"\375\377", 2}, "/f8="},
+ {{"\373\377", 2}, "+/8="},
+ {{"\367\377", 2}, "9/8="},
+ {{"\357\377", 2}, "7/8="},
+ {{"\337\377", 2}, "3/8="},
+ {{"\277\377", 2}, "v/8="},
+ {{"\177\377", 2}, "f/8="},
+
+ {{"\000\000\000", 3}, "AAAA"},
+ {{"\000\000\001", 3}, "AAAB"},
+ {{"\000\000\002", 3}, "AAAC"},
+ {{"\000\000\004", 3}, "AAAE"},
+ {{"\000\000\010", 3}, "AAAI"},
+ {{"\000\000\020", 3}, "AAAQ"},
+ {{"\000\000\040", 3}, "AAAg"},
+ {{"\000\000\100", 3}, "AABA"},
+ {{"\000\000\200", 3}, "AACA"},
+ {{"\000\001\000", 3}, "AAEA"},
+ {{"\000\002\000", 3}, "AAIA"},
+ {{"\000\004\000", 3}, "AAQA"},
+ {{"\000\010\000", 3}, "AAgA"},
+ {{"\000\020\000", 3}, "ABAA"},
+ {{"\000\040\000", 3}, "ACAA"},
+ {{"\000\100\000", 3}, "AEAA"},
+ {{"\000\200\000", 3}, "AIAA"},
+ {{"\001\000\000", 3}, "AQAA"},
+ {{"\002\000\000", 3}, "AgAA"},
+ {{"\004\000\000", 3}, "BAAA"},
+ {{"\010\000\000", 3}, "CAAA"},
+ {{"\020\000\000", 3}, "EAAA"},
+ {{"\040\000\000", 3}, "IAAA"},
+ {{"\100\000\000", 3}, "QAAA"},
+ {{"\200\000\000", 3}, "gAAA"},
+
+ {{"\377\377\377", 3}, "////"},
+ {{"\377\377\376", 3}, "///+"},
+ {{"\377\377\375", 3}, "///9"},
+ {{"\377\377\373", 3}, "///7"},
+ {{"\377\377\367", 3}, "///3"},
+ {{"\377\377\357", 3}, "///v"},
+ {{"\377\377\337", 3}, "///f"},
+ {{"\377\377\277", 3}, "//+/"},
+ {{"\377\377\177", 3}, "//9/"},
+ {{"\377\376\377", 3}, "//7/"},
+ {{"\377\375\377", 3}, "//3/"},
+ {{"\377\373\377", 3}, "//v/"},
+ {{"\377\367\377", 3}, "//f/"},
+ {{"\377\357\377", 3}, "/+//"},
+ {{"\377\337\377", 3}, "/9//"},
+ {{"\377\277\377", 3}, "/7//"},
+ {{"\377\177\377", 3}, "/3//"},
+ {{"\376\377\377", 3}, "/v//"},
+ {{"\375\377\377", 3}, "/f//"},
+ {{"\373\377\377", 3}, "+///"},
+ {{"\367\377\377", 3}, "9///"},
+ {{"\357\377\377", 3}, "7///"},
+ {{"\337\377\377", 3}, "3///"},
+ {{"\277\377\377", 3}, "v///"},
+ {{"\177\377\377", 3}, "f///"},
+
+ // Random numbers: values obtained with
+ //
+ // #! /bin/bash
+ // dd bs=$1 count=1 if=/dev/random of=/tmp/bar.random
+ // od -N $1 -t o1 /tmp/bar.random
+ // uuencode -m test < /tmp/bar.random
+ //
+ // where $1 is the number of bytes (2, 3)
+
+ {{"\243\361", 2}, "o/E="},
+ {{"\024\167", 2}, "FHc="},
+ {{"\313\252", 2}, "y6o="},
+ {{"\046\041", 2}, "JiE="},
+ {{"\145\236", 2}, "ZZ4="},
+ {{"\254\325", 2}, "rNU="},
+ {{"\061\330", 2}, "Mdg="},
+ {{"\245\032", 2}, "pRo="},
+ {{"\006\000", 2}, "BgA="},
+ {{"\375\131", 2}, "/Vk="},
+ {{"\303\210", 2}, "w4g="},
+ {{"\040\037", 2}, "IB8="},
+ {{"\261\372", 2}, "sfo="},
+ {{"\335\014", 2}, "3Qw="},
+ {{"\233\217", 2}, "m48="},
+ {{"\373\056", 2}, "+y4="},
+ {{"\247\232", 2}, "p5o="},
+ {{"\107\053", 2}, "Rys="},
+ {{"\204\077", 2}, "hD8="},
+ {{"\276\211", 2}, "vok="},
+ {{"\313\110", 2}, "y0g="},
+ {{"\363\376", 2}, "8/4="},
+ {{"\251\234", 2}, "qZw="},
+ {{"\103\262", 2}, "Q7I="},
+ {{"\142\312", 2}, "Yso="},
+ {{"\067\211", 2}, "N4k="},
+ {{"\220\001", 2}, "kAE="},
+ {{"\152\240", 2}, "aqA="},
+ {{"\367\061", 2}, "9zE="},
+ {{"\133\255", 2}, "W60="},
+ {{"\176\035", 2}, "fh0="},
+ {{"\032\231", 2}, "Gpk="},
+
+ {{"\013\007\144", 3}, "Cwdk"},
+ {{"\030\112\106", 3}, "GEpG"},
+ {{"\047\325\046", 3}, "J9Um"},
+ {{"\310\160\022", 3}, "yHAS"},
+ {{"\131\100\237", 3}, "WUCf"},
+ {{"\064\342\134", 3}, "NOJc"},
+ {{"\010\177\004", 3}, "CH8E"},
+ {{"\345\147\205", 3}, "5WeF"},
+ {{"\300\343\360", 3}, "wOPw"},
+ {{"\061\240\201", 3}, "MaCB"},
+ {{"\225\333\044", 3}, "ldsk"},
+ {{"\215\137\352", 3}, "jV/q"},
+ {{"\371\147\160", 3}, "+Wdw"},
+ {{"\030\320\051", 3}, "GNAp"},
+ {{"\044\174\241", 3}, "JHyh"},
+ {{"\260\127\037", 3}, "sFcf"},
+ {{"\111\045\033", 3}, "SSUb"},
+ {{"\202\114\107", 3}, "gkxH"},
+ {{"\057\371\042", 3}, "L/ki"},
+ {{"\223\247\244", 3}, "k6ek"},
+ {{"\047\216\144", 3}, "J45k"},
+ {{"\203\070\327", 3}, "gzjX"},
+ {{"\247\140\072", 3}, "p2A6"},
+ {{"\124\115\116", 3}, "VE1O"},
+ {{"\157\162\050", 3}, "b3Io"},
+ {{"\357\223\004", 3}, "75ME"},
+ {{"\052\117\156", 3}, "Kk9u"},
+ {{"\347\154\000", 3}, "52wA"},
+ {{"\303\012\142", 3}, "wwpi"},
+ {{"\060\035\362", 3}, "MB3y"},
+ {{"\130\226\361", 3}, "WJbx"},
+ {{"\173\013\071", 3}, "ews5"},
+ {{"\336\004\027", 3}, "3gQX"},
+ {{"\357\366\234", 3}, "7/ac"},
+ {{"\353\304\111", 3}, "68RJ"},
+ {{"\024\264\131", 3}, "FLRZ"},
+ {{"\075\114\251", 3}, "PUyp"},
+ {{"\315\031\225", 3}, "zRmV"},
+ {{"\154\201\276", 3}, "bIG+"},
+ {{"\200\066\072", 3}, "gDY6"},
+ {{"\142\350\267", 3}, "Yui3"},
+ {{"\033\000\166", 3}, "GwB2"},
+ {{"\210\055\077", 3}, "iC0/"},
+ {{"\341\037\124", 3}, "4R9U"},
+ {{"\161\103\152", 3}, "cUNq"},
+ {{"\270\142\131", 3}, "uGJZ"},
+ {{"\337\076\074", 3}, "3z48"},
+ {{"\375\106\362", 3}, "/Uby"},
+ {{"\227\301\127", 3}, "l8FX"},
+ {{"\340\002\234", 3}, "4AKc"},
+ {{"\121\064\033", 3}, "UTQb"},
+ {{"\157\134\143", 3}, "b1xj"},
+ {{"\247\055\327", 3}, "py3X"},
+ {{"\340\142\005", 3}, "4GIF"},
+ {{"\060\260\143", 3}, "MLBj"},
+ {{"\075\203\170", 3}, "PYN4"},
+ {{"\143\160\016", 3}, "Y3AO"},
+ {{"\313\013\063", 3}, "ywsz"},
+ {{"\174\236\135", 3}, "fJ5d"},
+ {{"\103\047\026", 3}, "QycW"},
+ {{"\365\005\343", 3}, "9QXj"},
+ {{"\271\160\223", 3}, "uXCT"},
+ {{"\362\255\172", 3}, "8q16"},
+ {{"\113\012\015", 3}, "SwoN"},
+
+ // various lengths, generated by this python script:
+ //
+ // from std::string import lowercase as lc
+ // for i in range(27):
+ // print '{ %2d, "%s",%s "%s" },' % (i, lc[:i], ' ' * (26-i),
+ // lc[:i].encode('base64').strip())
+
+ {{"", 0}, {"", 0}},
+ {"a", "YQ=="},
+ {"ab", "YWI="},
+ {"abc", "YWJj"},
+ {"abcd", "YWJjZA=="},
+ {"abcde", "YWJjZGU="},
+ {"abcdef", "YWJjZGVm"},
+ {"abcdefg", "YWJjZGVmZw=="},
+ {"abcdefgh", "YWJjZGVmZ2g="},
+ {"abcdefghi", "YWJjZGVmZ2hp"},
+ {"abcdefghij", "YWJjZGVmZ2hpag=="},
+ {"abcdefghijk", "YWJjZGVmZ2hpams="},
+ {"abcdefghijkl", "YWJjZGVmZ2hpamts"},
+ {"abcdefghijklm", "YWJjZGVmZ2hpamtsbQ=="},
+ {"abcdefghijklmn", "YWJjZGVmZ2hpamtsbW4="},
+ {"abcdefghijklmno", "YWJjZGVmZ2hpamtsbW5v"},
+ {"abcdefghijklmnop", "YWJjZGVmZ2hpamtsbW5vcA=="},
+ {"abcdefghijklmnopq", "YWJjZGVmZ2hpamtsbW5vcHE="},
+ {"abcdefghijklmnopqr", "YWJjZGVmZ2hpamtsbW5vcHFy"},
+ {"abcdefghijklmnopqrs", "YWJjZGVmZ2hpamtsbW5vcHFycw=="},
+ {"abcdefghijklmnopqrst", "YWJjZGVmZ2hpamtsbW5vcHFyc3Q="},
+ {"abcdefghijklmnopqrstu", "YWJjZGVmZ2hpamtsbW5vcHFyc3R1"},
+ {"abcdefghijklmnopqrstuv", "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dg=="},
+ {"abcdefghijklmnopqrstuvw", "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnc="},
+ {"abcdefghijklmnopqrstuvwx", "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4"},
+ {"abcdefghijklmnopqrstuvwxy", "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eQ=="},
+ {"abcdefghijklmnopqrstuvwxyz", "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXo="},
+};
+
+template <typename StringType>
+void TestEscapeAndUnescape() {
+ // Check the short strings; this tests the math (and boundaries)
+ for (const auto& tc : base64_tests) {
+ StringType encoded("this junk should be ignored");
+ absl::Base64Escape(tc.plaintext, &encoded);
+ EXPECT_EQ(encoded, tc.cyphertext);
+ EXPECT_EQ(absl::Base64Escape(tc.plaintext), tc.cyphertext);
+
+ StringType decoded("this junk should be ignored");
+ EXPECT_TRUE(absl::Base64Unescape(encoded, &decoded));
+ EXPECT_EQ(decoded, tc.plaintext);
+
+ StringType websafe(tc.cyphertext);
+ for (int c = 0; c < websafe.size(); ++c) {
+ if ('+' == websafe[c]) websafe[c] = '-';
+ if ('/' == websafe[c]) websafe[c] = '_';
+ if ('=' == websafe[c]) {
+ websafe.resize(c);
+ break;
+ }
+ }
+
+ encoded = "this junk should be ignored";
+ absl::WebSafeBase64Escape(tc.plaintext, &encoded);
+ EXPECT_EQ(encoded, websafe);
+ EXPECT_EQ(absl::WebSafeBase64Escape(tc.plaintext), websafe);
+
+ // Let's try the string version of the decoder
+ decoded = "this junk should be ignored";
+ EXPECT_TRUE(absl::WebSafeBase64Unescape(websafe, &decoded));
+ EXPECT_EQ(decoded, tc.plaintext);
+ }
+
+ // Now try the long strings, this tests the streaming
+ for (const auto& tc : absl::strings_internal::base64_strings()) {
+ StringType buffer;
+ absl::WebSafeBase64Escape(tc.plaintext, &buffer);
+ EXPECT_EQ(tc.cyphertext, buffer);
+ EXPECT_EQ(absl::WebSafeBase64Escape(tc.plaintext), tc.cyphertext);
+ }
+
+ // Verify the behavior when decoding bad data
+ {
+ absl::string_view data_set[] = {"ab-/", absl::string_view("\0bcd", 4),
+ absl::string_view("abc.\0", 5)};
+ for (absl::string_view bad_data : data_set) {
+ StringType buf;
+ EXPECT_FALSE(absl::Base64Unescape(bad_data, &buf));
+ EXPECT_FALSE(absl::WebSafeBase64Unescape(bad_data, &buf));
+ EXPECT_TRUE(buf.empty());
+ }
+ }
+}
+
+TEST(Base64, EscapeAndUnescape) {
+ TestEscapeAndUnescape<std::string>();
+}
+
+TEST(Base64, DISABLED_HugeData) {
+ const size_t kSize = size_t(3) * 1000 * 1000 * 1000;
+ static_assert(kSize % 3 == 0, "kSize must be divisible by 3");
+ const std::string huge(kSize, 'x');
+
+ std::string escaped;
+ absl::Base64Escape(huge, &escaped);
+
+ // Generates the string that should match a base64 encoded "xxx..." string.
+ // "xxx" in base64 is "eHh4".
+ std::string expected_encoding;
+ expected_encoding.reserve(kSize / 3 * 4);
+ for (size_t i = 0; i < kSize / 3; ++i) {
+ expected_encoding.append("eHh4");
+ }
+ EXPECT_EQ(expected_encoding, escaped);
+
+ std::string unescaped;
+ EXPECT_TRUE(absl::Base64Unescape(escaped, &unescaped));
+ EXPECT_EQ(huge, unescaped);
+}
+
+TEST(HexAndBack, HexStringToBytes_and_BytesToHexString) {
+ std::string hex_mixed = "0123456789abcdefABCDEF";
+ std::string bytes_expected = "\x01\x23\x45\x67\x89\xab\xcd\xef\xAB\xCD\xEF";
+ std::string hex_only_lower = "0123456789abcdefabcdef";
+
+ std::string bytes_result = absl::HexStringToBytes(hex_mixed);
+ EXPECT_EQ(bytes_expected, bytes_result);
+
+ std::string prefix_valid = hex_mixed + "?";
+ std::string prefix_valid_result = absl::HexStringToBytes(
+ absl::string_view(prefix_valid.data(), prefix_valid.size() - 1));
+ EXPECT_EQ(bytes_expected, prefix_valid_result);
+
+ std::string infix_valid = "?" + hex_mixed + "???";
+ std::string infix_valid_result = absl::HexStringToBytes(
+ absl::string_view(infix_valid.data() + 1, hex_mixed.size()));
+ EXPECT_EQ(bytes_expected, infix_valid_result);
+
+ std::string hex_result = absl::BytesToHexString(bytes_expected);
+ EXPECT_EQ(hex_only_lower, hex_result);
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/strings/internal/char_map.h b/third_party/abseil/src/absl/strings/internal/char_map.h
new file mode 100644
index 0000000..61484de
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/internal/char_map.h
@@ -0,0 +1,156 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// Character Map Class
+//
+// A fast, bit-vector map for 8-bit unsigned characters.
+// This class is useful for non-character purposes as well.
+
+#ifndef ABSL_STRINGS_INTERNAL_CHAR_MAP_H_
+#define ABSL_STRINGS_INTERNAL_CHAR_MAP_H_
+
+#include <cstddef>
+#include <cstdint>
+#include <cstring>
+
+#include "absl/base/macros.h"
+#include "absl/base/port.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace strings_internal {
+
+class Charmap {
+ public:
+ constexpr Charmap() : m_() {}
+
+ // Initializes with a given char*. Note that NUL is not treated as
+ // a terminator, but rather a char to be flicked.
+ Charmap(const char* str, int len) : m_() {
+ while (len--) SetChar(*str++);
+ }
+
+ // Initializes with a given char*. NUL is treated as a terminator
+ // and will not be in the charmap.
+ explicit Charmap(const char* str) : m_() {
+ while (*str) SetChar(*str++);
+ }
+
+ constexpr bool contains(unsigned char c) const {
+ return (m_[c / 64] >> (c % 64)) & 0x1;
+ }
+
+ // Returns true if and only if a character exists in both maps.
+ bool IntersectsWith(const Charmap& c) const {
+ for (size_t i = 0; i < ABSL_ARRAYSIZE(m_); ++i) {
+ if ((m_[i] & c.m_[i]) != 0) return true;
+ }
+ return false;
+ }
+
+ bool IsZero() const {
+ for (uint64_t c : m_) {
+ if (c != 0) return false;
+ }
+ return true;
+ }
+
+ // Containing only a single specified char.
+ static constexpr Charmap Char(char x) {
+ return Charmap(CharMaskForWord(x, 0), CharMaskForWord(x, 1),
+ CharMaskForWord(x, 2), CharMaskForWord(x, 3));
+ }
+
+ // Containing all the chars in the C-string 's'.
+ // Note that this is expensively recursive because of the C++11 constexpr
+ // formulation. Use only in constexpr initializers.
+ static constexpr Charmap FromString(const char* s) {
+ return *s == 0 ? Charmap() : (Char(*s) | FromString(s + 1));
+ }
+
+ // Containing all the chars in the closed interval [lo,hi].
+ static constexpr Charmap Range(char lo, char hi) {
+ return Charmap(RangeForWord(lo, hi, 0), RangeForWord(lo, hi, 1),
+ RangeForWord(lo, hi, 2), RangeForWord(lo, hi, 3));
+ }
+
+ friend constexpr Charmap operator&(const Charmap& a, const Charmap& b) {
+ return Charmap(a.m_[0] & b.m_[0], a.m_[1] & b.m_[1], a.m_[2] & b.m_[2],
+ a.m_[3] & b.m_[3]);
+ }
+
+ friend constexpr Charmap operator|(const Charmap& a, const Charmap& b) {
+ return Charmap(a.m_[0] | b.m_[0], a.m_[1] | b.m_[1], a.m_[2] | b.m_[2],
+ a.m_[3] | b.m_[3]);
+ }
+
+ friend constexpr Charmap operator~(const Charmap& a) {
+ return Charmap(~a.m_[0], ~a.m_[1], ~a.m_[2], ~a.m_[3]);
+ }
+
+ private:
+ constexpr Charmap(uint64_t b0, uint64_t b1, uint64_t b2, uint64_t b3)
+ : m_{b0, b1, b2, b3} {}
+
+ static constexpr uint64_t RangeForWord(unsigned char lo, unsigned char hi,
+ uint64_t word) {
+ return OpenRangeFromZeroForWord(hi + 1, word) &
+ ~OpenRangeFromZeroForWord(lo, word);
+ }
+
+ // All the chars in the specified word of the range [0, upper).
+ static constexpr uint64_t OpenRangeFromZeroForWord(uint64_t upper,
+ uint64_t word) {
+ return (upper <= 64 * word)
+ ? 0
+ : (upper >= 64 * (word + 1))
+ ? ~static_cast<uint64_t>(0)
+ : (~static_cast<uint64_t>(0) >> (64 - upper % 64));
+ }
+
+ static constexpr uint64_t CharMaskForWord(unsigned char x, uint64_t word) {
+ return (x / 64 == word) ? (static_cast<uint64_t>(1) << (x % 64)) : 0;
+ }
+
+ private:
+ void SetChar(unsigned char c) {
+ m_[c / 64] |= static_cast<uint64_t>(1) << (c % 64);
+ }
+
+ uint64_t m_[4];
+};
+
+// Mirror the char-classifying predicates in <cctype>
+constexpr Charmap UpperCharmap() { return Charmap::Range('A', 'Z'); }
+constexpr Charmap LowerCharmap() { return Charmap::Range('a', 'z'); }
+constexpr Charmap DigitCharmap() { return Charmap::Range('0', '9'); }
+constexpr Charmap AlphaCharmap() { return LowerCharmap() | UpperCharmap(); }
+constexpr Charmap AlnumCharmap() { return DigitCharmap() | AlphaCharmap(); }
+constexpr Charmap XDigitCharmap() {
+ return DigitCharmap() | Charmap::Range('A', 'F') | Charmap::Range('a', 'f');
+}
+constexpr Charmap PrintCharmap() { return Charmap::Range(0x20, 0x7e); }
+constexpr Charmap SpaceCharmap() { return Charmap::FromString("\t\n\v\f\r "); }
+constexpr Charmap CntrlCharmap() {
+ return Charmap::Range(0, 0x7f) & ~PrintCharmap();
+}
+constexpr Charmap BlankCharmap() { return Charmap::FromString("\t "); }
+constexpr Charmap GraphCharmap() { return PrintCharmap() & ~SpaceCharmap(); }
+constexpr Charmap PunctCharmap() { return GraphCharmap() & ~AlnumCharmap(); }
+
+} // namespace strings_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_STRINGS_INTERNAL_CHAR_MAP_H_
diff --git a/third_party/abseil/src/absl/strings/internal/char_map_benchmark.cc b/third_party/abseil/src/absl/strings/internal/char_map_benchmark.cc
new file mode 100644
index 0000000..5cef967
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/internal/char_map_benchmark.cc
@@ -0,0 +1,61 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/strings/internal/char_map.h"
+
+#include <cstdint>
+
+#include "benchmark/benchmark.h"
+
+namespace {
+
+absl::strings_internal::Charmap MakeBenchmarkMap() {
+ absl::strings_internal::Charmap m;
+ uint32_t x[] = {0x0, 0x1, 0x2, 0x3, 0xf, 0xe, 0xd, 0xc};
+ for (uint32_t& t : x) t *= static_cast<uint32_t>(0x11111111UL);
+ for (uint32_t i = 0; i < 256; ++i) {
+ if ((x[i / 32] >> (i % 32)) & 1)
+ m = m | absl::strings_internal::Charmap::Char(i);
+ }
+ return m;
+}
+
+// Micro-benchmark for Charmap::contains.
+void BM_Contains(benchmark::State& state) {
+ // Loop-body replicated 10 times to increase time per iteration.
+ // Argument continuously changed to avoid generating common subexpressions.
+ const absl::strings_internal::Charmap benchmark_map = MakeBenchmarkMap();
+ unsigned char c = 0;
+ int ops = 0;
+ for (auto _ : state) {
+ ops += benchmark_map.contains(c++);
+ ops += benchmark_map.contains(c++);
+ ops += benchmark_map.contains(c++);
+ ops += benchmark_map.contains(c++);
+ ops += benchmark_map.contains(c++);
+ ops += benchmark_map.contains(c++);
+ ops += benchmark_map.contains(c++);
+ ops += benchmark_map.contains(c++);
+ ops += benchmark_map.contains(c++);
+ ops += benchmark_map.contains(c++);
+ }
+ benchmark::DoNotOptimize(ops);
+}
+BENCHMARK(BM_Contains);
+
+// We don't bother benchmarking Charmap::IsZero or Charmap::IntersectsWith;
+// their running time is data-dependent and it is not worth characterizing
+// "typical" data.
+
+} // namespace
diff --git a/third_party/abseil/src/absl/strings/internal/char_map_test.cc b/third_party/abseil/src/absl/strings/internal/char_map_test.cc
new file mode 100644
index 0000000..d330624
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/internal/char_map_test.cc
@@ -0,0 +1,172 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/strings/internal/char_map.h"
+
+#include <cctype>
+#include <string>
+#include <vector>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+
+namespace {
+
+constexpr absl::strings_internal::Charmap everything_map =
+ ~absl::strings_internal::Charmap();
+constexpr absl::strings_internal::Charmap nothing_map{};
+
+TEST(Charmap, AllTests) {
+ const absl::strings_internal::Charmap also_nothing_map("", 0);
+ ASSERT_TRUE(everything_map.contains('\0'));
+ ASSERT_TRUE(!nothing_map.contains('\0'));
+ ASSERT_TRUE(!also_nothing_map.contains('\0'));
+ for (unsigned char ch = 1; ch != 0; ++ch) {
+ ASSERT_TRUE(everything_map.contains(ch));
+ ASSERT_TRUE(!nothing_map.contains(ch));
+ ASSERT_TRUE(!also_nothing_map.contains(ch));
+ }
+
+ const absl::strings_internal::Charmap symbols("&@#@^!@?", 5);
+ ASSERT_TRUE(symbols.contains('&'));
+ ASSERT_TRUE(symbols.contains('@'));
+ ASSERT_TRUE(symbols.contains('#'));
+ ASSERT_TRUE(symbols.contains('^'));
+ ASSERT_TRUE(!symbols.contains('!'));
+ ASSERT_TRUE(!symbols.contains('?'));
+ int cnt = 0;
+ for (unsigned char ch = 1; ch != 0; ++ch)
+ cnt += symbols.contains(ch);
+ ASSERT_EQ(cnt, 4);
+
+ const absl::strings_internal::Charmap lets("^abcde", 3);
+ const absl::strings_internal::Charmap lets2("fghij\0klmnop", 10);
+ const absl::strings_internal::Charmap lets3("fghij\0klmnop");
+ ASSERT_TRUE(lets2.contains('k'));
+ ASSERT_TRUE(!lets3.contains('k'));
+
+ ASSERT_TRUE(symbols.IntersectsWith(lets));
+ ASSERT_TRUE(!lets2.IntersectsWith(lets));
+ ASSERT_TRUE(lets.IntersectsWith(symbols));
+ ASSERT_TRUE(!lets.IntersectsWith(lets2));
+
+ ASSERT_TRUE(nothing_map.IsZero());
+ ASSERT_TRUE(!lets.IsZero());
+}
+
+namespace {
+std::string Members(const absl::strings_internal::Charmap& m) {
+ std::string r;
+ for (size_t i = 0; i < 256; ++i)
+ if (m.contains(i)) r.push_back(i);
+ return r;
+}
+
+std::string ClosedRangeString(unsigned char lo, unsigned char hi) {
+ // Don't depend on lo<hi. Just increment until lo==hi.
+ std::string s;
+ while (true) {
+ s.push_back(lo);
+ if (lo == hi) break;
+ ++lo;
+ }
+ return s;
+}
+
+} // namespace
+
+TEST(Charmap, Constexpr) {
+ constexpr absl::strings_internal::Charmap kEmpty = nothing_map;
+ EXPECT_THAT(Members(kEmpty), "");
+ constexpr absl::strings_internal::Charmap kA =
+ absl::strings_internal::Charmap::Char('A');
+ EXPECT_THAT(Members(kA), "A");
+ constexpr absl::strings_internal::Charmap kAZ =
+ absl::strings_internal::Charmap::Range('A', 'Z');
+ EXPECT_THAT(Members(kAZ), "ABCDEFGHIJKLMNOPQRSTUVWXYZ");
+ constexpr absl::strings_internal::Charmap kIdentifier =
+ absl::strings_internal::Charmap::Range('0', '9') |
+ absl::strings_internal::Charmap::Range('A', 'Z') |
+ absl::strings_internal::Charmap::Range('a', 'z') |
+ absl::strings_internal::Charmap::Char('_');
+ EXPECT_THAT(Members(kIdentifier),
+ "0123456789"
+ "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+ "_"
+ "abcdefghijklmnopqrstuvwxyz");
+ constexpr absl::strings_internal::Charmap kAll = everything_map;
+ for (size_t i = 0; i < 256; ++i) {
+ EXPECT_TRUE(kAll.contains(i)) << i;
+ }
+ constexpr absl::strings_internal::Charmap kHello =
+ absl::strings_internal::Charmap::FromString("Hello, world!");
+ EXPECT_THAT(Members(kHello), " !,Hdelorw");
+
+ // test negation and intersection
+ constexpr absl::strings_internal::Charmap kABC =
+ absl::strings_internal::Charmap::Range('A', 'Z') &
+ ~absl::strings_internal::Charmap::Range('D', 'Z');
+ EXPECT_THAT(Members(kABC), "ABC");
+}
+
+TEST(Charmap, Range) {
+ // Exhaustive testing takes too long, so test some of the boundaries that
+ // are perhaps going to cause trouble.
+ std::vector<size_t> poi = {0, 1, 2, 3, 4, 7, 8, 9, 15,
+ 16, 17, 30, 31, 32, 33, 63, 64, 65,
+ 127, 128, 129, 223, 224, 225, 254, 255};
+ for (auto lo = poi.begin(); lo != poi.end(); ++lo) {
+ SCOPED_TRACE(*lo);
+ for (auto hi = lo; hi != poi.end(); ++hi) {
+ SCOPED_TRACE(*hi);
+ EXPECT_THAT(Members(absl::strings_internal::Charmap::Range(*lo, *hi)),
+ ClosedRangeString(*lo, *hi));
+ }
+ }
+}
+
+bool AsBool(int x) { return static_cast<bool>(x); }
+
+TEST(CharmapCtype, Match) {
+ for (int c = 0; c < 256; ++c) {
+ SCOPED_TRACE(c);
+ SCOPED_TRACE(static_cast<char>(c));
+ EXPECT_EQ(AsBool(std::isupper(c)),
+ absl::strings_internal::UpperCharmap().contains(c));
+ EXPECT_EQ(AsBool(std::islower(c)),
+ absl::strings_internal::LowerCharmap().contains(c));
+ EXPECT_EQ(AsBool(std::isdigit(c)),
+ absl::strings_internal::DigitCharmap().contains(c));
+ EXPECT_EQ(AsBool(std::isalpha(c)),
+ absl::strings_internal::AlphaCharmap().contains(c));
+ EXPECT_EQ(AsBool(std::isalnum(c)),
+ absl::strings_internal::AlnumCharmap().contains(c));
+ EXPECT_EQ(AsBool(std::isxdigit(c)),
+ absl::strings_internal::XDigitCharmap().contains(c));
+ EXPECT_EQ(AsBool(std::isprint(c)),
+ absl::strings_internal::PrintCharmap().contains(c));
+ EXPECT_EQ(AsBool(std::isspace(c)),
+ absl::strings_internal::SpaceCharmap().contains(c));
+ EXPECT_EQ(AsBool(std::iscntrl(c)),
+ absl::strings_internal::CntrlCharmap().contains(c));
+ EXPECT_EQ(AsBool(std::isblank(c)),
+ absl::strings_internal::BlankCharmap().contains(c));
+ EXPECT_EQ(AsBool(std::isgraph(c)),
+ absl::strings_internal::GraphCharmap().contains(c));
+ EXPECT_EQ(AsBool(std::ispunct(c)),
+ absl::strings_internal::PunctCharmap().contains(c));
+ }
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/strings/internal/charconv_bigint.cc b/third_party/abseil/src/absl/strings/internal/charconv_bigint.cc
new file mode 100644
index 0000000..ebf8c07
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/internal/charconv_bigint.cc
@@ -0,0 +1,359 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/strings/internal/charconv_bigint.h"
+
+#include <algorithm>
+#include <cassert>
+#include <string>
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace strings_internal {
+
+namespace {
+
+// Table containing some large powers of 5, for fast computation.
+
+// Constant step size for entries in the kLargePowersOfFive table. Each entry
+// is larger than the previous entry by a factor of 5**kLargePowerOfFiveStep
+// (or 5**27).
+//
+// In other words, the Nth entry in the table is 5**(27*N).
+//
+// 5**27 is the largest power of 5 that fits in 64 bits.
+constexpr int kLargePowerOfFiveStep = 27;
+
+// The largest legal index into the kLargePowersOfFive table.
+//
+// In other words, the largest precomputed power of 5 is 5**(27*20).
+constexpr int kLargestPowerOfFiveIndex = 20;
+
+// Table of powers of (5**27), up to (5**27)**20 == 5**540.
+//
+// Used to generate large powers of 5 while limiting the number of repeated
+// multiplications required.
+//
+// clang-format off
+const uint32_t kLargePowersOfFive[] = {
+// 5**27 (i=1), start=0, end=2
+ 0xfa10079dU, 0x6765c793U,
+// 5**54 (i=2), start=2, end=6
+ 0x97d9f649U, 0x6664242dU, 0x29939b14U, 0x29c30f10U,
+// 5**81 (i=3), start=6, end=12
+ 0xc4f809c5U, 0x7bf3f22aU, 0x67bdae34U, 0xad340517U, 0x369d1b5fU, 0x10de1593U,
+// 5**108 (i=4), start=12, end=20
+ 0x92b260d1U, 0x9efff7c7U, 0x81de0ec6U, 0xaeba5d56U, 0x410664a4U, 0x4f40737aU,
+ 0x20d3846fU, 0x06d00f73U,
+// 5**135 (i=5), start=20, end=30
+ 0xff1b172dU, 0x13a1d71cU, 0xefa07617U, 0x7f682d3dU, 0xff8c90c0U, 0x3f0131e7U,
+ 0x3fdcb9feU, 0x917b0177U, 0x16c407a7U, 0x02c06b9dU,
+// 5**162 (i=6), start=30, end=42
+ 0x960f7199U, 0x056667ecU, 0xe07aefd8U, 0x80f2b9ccU, 0x8273f5e3U, 0xeb9a214aU,
+ 0x40b38005U, 0x0e477ad4U, 0x277d08e6U, 0xfa28b11eU, 0xd3f7d784U, 0x011c835bU,
+// 5**189 (i=7), start=42, end=56
+ 0xf723d9d5U, 0x3282d3f3U, 0xe00857d1U, 0x69659d25U, 0x2cf117cfU, 0x24da6d07U,
+ 0x954d1417U, 0x3e5d8cedU, 0x7a8bb766U, 0xfd785ae6U, 0x645436d2U, 0x40c78b34U,
+ 0x94151217U, 0x0072e9f7U,
+// 5**216 (i=8), start=56, end=72
+ 0x2b416aa1U, 0x7893c5a7U, 0xe37dc6d4U, 0x2bad2beaU, 0xf0fc846cU, 0x7575ae4bU,
+ 0x62587b14U, 0x83b67a34U, 0x02110cdbU, 0xf7992f55U, 0x00deb022U, 0xa4a23becU,
+ 0x8af5c5cdU, 0xb85b654fU, 0x818df38bU, 0x002e69d2U,
+// 5**243 (i=9), start=72, end=90
+ 0x3518cbbdU, 0x20b0c15fU, 0x38756c2fU, 0xfb5dc3ddU, 0x22ad2d94U, 0xbf35a952U,
+ 0xa699192aU, 0x9a613326U, 0xad2a9cedU, 0xd7f48968U, 0xe87dfb54U, 0xc8f05db6U,
+ 0x5ef67531U, 0x31c1ab49U, 0xe202ac9fU, 0x9b2957b5U, 0xa143f6d3U, 0x0012bf07U,
+// 5**270 (i=10), start=90, end=110
+ 0x8b971de9U, 0x21aba2e1U, 0x63944362U, 0x57172336U, 0xd9544225U, 0xfb534166U,
+ 0x08c563eeU, 0x14640ee2U, 0x24e40d31U, 0x02b06537U, 0x03887f14U, 0x0285e533U,
+ 0xb744ef26U, 0x8be3a6c4U, 0x266979b4U, 0x6761ece2U, 0xd9cb39e4U, 0xe67de319U,
+ 0x0d39e796U, 0x00079250U,
+// 5**297 (i=11), start=110, end=132
+ 0x260eb6e5U, 0xf414a796U, 0xee1a7491U, 0xdb9368ebU, 0xf50c105bU, 0x59157750U,
+ 0x9ed2fb5cU, 0xf6e56d8bU, 0xeaee8d23U, 0x0f319f75U, 0x2aa134d6U, 0xac2908e9U,
+ 0xd4413298U, 0x02f02a55U, 0x989d5a7aU, 0x70dde184U, 0xba8040a7U, 0x03200981U,
+ 0xbe03b11cU, 0x3c1c2a18U, 0xd60427a1U, 0x00030ee0U,
+// 5**324 (i=12), start=132, end=156
+ 0xce566d71U, 0xf1c4aa25U, 0x4e93ca53U, 0xa72283d0U, 0x551a73eaU, 0x3d0538e2U,
+ 0x8da4303fU, 0x6a58de60U, 0x0e660221U, 0x49cf61a6U, 0x8d058fc1U, 0xb9d1a14cU,
+ 0x4bab157dU, 0xc85c6932U, 0x518c8b9eU, 0x9b92b8d0U, 0x0d8a0e21U, 0xbd855df9U,
+ 0xb3ea59a1U, 0x8da29289U, 0x4584d506U, 0x3752d80fU, 0xb72569c6U, 0x00013c33U,
+// 5**351 (i=13), start=156, end=182
+ 0x190f354dU, 0x83695cfeU, 0xe5a4d0c7U, 0xb60fb7e8U, 0xee5bbcc4U, 0xb922054cU,
+ 0xbb4f0d85U, 0x48394028U, 0x1d8957dbU, 0x0d7edb14U, 0x4ecc7587U, 0x505e9e02U,
+ 0x4c87f36bU, 0x99e66bd6U, 0x44b9ed35U, 0x753037d4U, 0xe5fe5f27U, 0x2742c203U,
+ 0x13b2ed2bU, 0xdc525d2cU, 0xe6fde59aU, 0x77ffb18fU, 0x13c5752cU, 0x08a84bccU,
+ 0x859a4940U, 0x00007fb6U,
+// 5**378 (i=14), start=182, end=210
+ 0x4f98cb39U, 0xa60edbbcU, 0x83b5872eU, 0xa501acffU, 0x9cc76f78U, 0xbadd4c73U,
+ 0x43e989faU, 0xca7acf80U, 0x2e0c824fU, 0xb19f4ffcU, 0x092fd81cU, 0xe4eb645bU,
+ 0xa1ff84c2U, 0x8a5a83baU, 0xa8a1fae9U, 0x1db43609U, 0xb0fed50bU, 0x0dd7d2bdU,
+ 0x7d7accd8U, 0x91fa640fU, 0x37dcc6c5U, 0x1c417fd5U, 0xe4d462adU, 0xe8a43399U,
+ 0x131bf9a5U, 0x8df54d29U, 0x36547dc1U, 0x00003395U,
+// 5**405 (i=15), start=210, end=240
+ 0x5bd330f5U, 0x77d21967U, 0x1ac481b7U, 0x6be2f7ceU, 0x7f4792a9U, 0xe84c2c52U,
+ 0x84592228U, 0x9dcaf829U, 0xdab44ce1U, 0x3d0c311bU, 0x532e297dU, 0x4704e8b4U,
+ 0x9cdc32beU, 0x41e64d9dU, 0x7717bea1U, 0xa824c00dU, 0x08f50b27U, 0x0f198d77U,
+ 0x49bbfdf0U, 0x025c6c69U, 0xd4e55cd3U, 0xf083602bU, 0xb9f0fecdU, 0xc0864aeaU,
+ 0x9cb98681U, 0xaaf620e9U, 0xacb6df30U, 0x4faafe66U, 0x8af13c3bU, 0x000014d5U,
+// 5**432 (i=16), start=240, end=272
+ 0x682bb941U, 0x89a9f297U, 0xcba75d7bU, 0x404217b1U, 0xb4e519e9U, 0xa1bc162bU,
+ 0xf7f5910aU, 0x98715af5U, 0x2ff53e57U, 0xe3ef118cU, 0x490c4543U, 0xbc9b1734U,
+ 0x2affbe4dU, 0x4cedcb4cU, 0xfb14e99eU, 0x35e34212U, 0xece39c24U, 0x07673ab3U,
+ 0xe73115ddU, 0xd15d38e7U, 0x093eed3bU, 0xf8e7eac5U, 0x78a8cc80U, 0x25227aacU,
+ 0x3f590551U, 0x413da1cbU, 0xdf643a55U, 0xab65ad44U, 0xd70b23d7U, 0xc672cd76U,
+ 0x3364ea62U, 0x0000086aU,
+// 5**459 (i=17), start=272, end=306
+ 0x22f163ddU, 0x23cf07acU, 0xbe2af6c2U, 0xf412f6f6U, 0xc3ff541eU, 0x6eeaf7deU,
+ 0xa47047e0U, 0x408cda92U, 0x0f0eeb08U, 0x56deba9dU, 0xcfc6b090U, 0x8bbbdf04U,
+ 0x3933cdb3U, 0x9e7bb67dU, 0x9f297035U, 0x38946244U, 0xee1d37bbU, 0xde898174U,
+ 0x63f3559dU, 0x705b72fbU, 0x138d27d9U, 0xf8603a78U, 0x735eec44U, 0xe30987d5U,
+ 0xc6d38070U, 0x9cfe548eU, 0x9ff01422U, 0x7c564aa8U, 0x91cc60baU, 0xcbc3565dU,
+ 0x7550a50bU, 0x6909aeadU, 0x13234c45U, 0x00000366U,
+// 5**486 (i=18), start=306, end=342
+ 0x17954989U, 0x3a7d7709U, 0x98042de5U, 0xa9011443U, 0x45e723c2U, 0x269ffd6fU,
+ 0x58852a46U, 0xaaa1042aU, 0x2eee8153U, 0xb2b6c39eU, 0xaf845b65U, 0xf6c365d7U,
+ 0xe4cffb2bU, 0xc840e90cU, 0xabea8abbU, 0x5c58f8d2U, 0x5c19fa3aU, 0x4670910aU,
+ 0x4449f21cU, 0xefa645b3U, 0xcc427decU, 0x083c3d73U, 0x467cb413U, 0x6fe10ae4U,
+ 0x3caffc72U, 0x9f8da55eU, 0x5e5c8ea7U, 0x490594bbU, 0xf0871b0bU, 0xdd89816cU,
+ 0x8e931df8U, 0xe85ce1c9U, 0xcca090a5U, 0x575fa16bU, 0x6b9f106cU, 0x0000015fU,
+// 5**513 (i=19), start=342, end=380
+ 0xee20d805U, 0x57bc3c07U, 0xcdea624eU, 0xd3f0f52dU, 0x9924b4f4U, 0xcf968640U,
+ 0x61d41962U, 0xe87fb464U, 0xeaaf51c7U, 0x564c8b60U, 0xccda4028U, 0x529428bbU,
+ 0x313a1fa8U, 0x96bd0f94U, 0x7a82ebaaU, 0xad99e7e9U, 0xf2668cd4U, 0xbe33a45eU,
+ 0xfd0db669U, 0x87ee369fU, 0xd3ec20edU, 0x9c4d7db7U, 0xdedcf0d8U, 0x7cd2ca64U,
+ 0xe25a6577U, 0x61003fd4U, 0xe56f54ccU, 0x10b7c748U, 0x40526e5eU, 0x7300ae87U,
+ 0x5c439261U, 0x2c0ff469U, 0xbf723f12U, 0xb2379b61U, 0xbf59b4f5U, 0xc91b1c3fU,
+ 0xf0046d27U, 0x0000008dU,
+// 5**540 (i=20), start=380, end=420
+ 0x525c9e11U, 0xf4e0eb41U, 0xebb2895dU, 0x5da512f9U, 0x7d9b29d4U, 0x452f4edcU,
+ 0x0b90bc37U, 0x341777cbU, 0x63d269afU, 0x1da77929U, 0x0a5c1826U, 0x77991898U,
+ 0x5aeddf86U, 0xf853a877U, 0x538c31ccU, 0xe84896daU, 0xb7a0010bU, 0x17ef4de5U,
+ 0xa52a2adeU, 0x029fd81cU, 0x987ce701U, 0x27fefd77U, 0xdb46c66fU, 0x5d301900U,
+ 0x496998c0U, 0xbb6598b9U, 0x5eebb607U, 0xe547354aU, 0xdf4a2f7eU, 0xf06c4955U,
+ 0x96242ffaU, 0x1775fb27U, 0xbecc58ceU, 0xebf2a53bU, 0x3eaad82aU, 0xf41137baU,
+ 0x573e6fbaU, 0xfb4866b8U, 0x54002148U, 0x00000039U,
+};
+// clang-format on
+
+// Returns a pointer to the big integer data for (5**27)**i. i must be
+// between 1 and 20, inclusive.
+const uint32_t* LargePowerOfFiveData(int i) {
+ return kLargePowersOfFive + i * (i - 1);
+}
+
+// Returns the size of the big integer data for (5**27)**i, in words. i must be
+// between 1 and 20, inclusive.
+int LargePowerOfFiveSize(int i) { return 2 * i; }
+} // namespace
+
+ABSL_DLL const uint32_t kFiveToNth[14] = {
+ 1, 5, 25, 125, 625, 3125, 15625,
+ 78125, 390625, 1953125, 9765625, 48828125, 244140625, 1220703125,
+};
+
+ABSL_DLL const uint32_t kTenToNth[10] = {
+ 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, 100000000, 1000000000,
+};
+
+template <int max_words>
+int BigUnsigned<max_words>::ReadFloatMantissa(const ParsedFloat& fp,
+ int significant_digits) {
+ SetToZero();
+ assert(fp.type == FloatType::kNumber);
+
+ if (fp.subrange_begin == nullptr) {
+ // We already exactly parsed the mantissa, so no more work is necessary.
+ words_[0] = fp.mantissa & 0xffffffffu;
+ words_[1] = fp.mantissa >> 32;
+ if (words_[1]) {
+ size_ = 2;
+ } else if (words_[0]) {
+ size_ = 1;
+ }
+ return fp.exponent;
+ }
+ int exponent_adjust =
+ ReadDigits(fp.subrange_begin, fp.subrange_end, significant_digits);
+ return fp.literal_exponent + exponent_adjust;
+}
+
+template <int max_words>
+int BigUnsigned<max_words>::ReadDigits(const char* begin, const char* end,
+ int significant_digits) {
+ assert(significant_digits <= Digits10() + 1);
+ SetToZero();
+
+ bool after_decimal_point = false;
+ // Discard any leading zeroes before the decimal point
+ while (begin < end && *begin == '0') {
+ ++begin;
+ }
+ int dropped_digits = 0;
+ // Discard any trailing zeroes. These may or may not be after the decimal
+ // point.
+ while (begin < end && *std::prev(end) == '0') {
+ --end;
+ ++dropped_digits;
+ }
+ if (begin < end && *std::prev(end) == '.') {
+ // If the string ends in '.', either before or after dropping zeroes, then
+ // drop the decimal point and look for more digits to drop.
+ dropped_digits = 0;
+ --end;
+ while (begin < end && *std::prev(end) == '0') {
+ --end;
+ ++dropped_digits;
+ }
+ } else if (dropped_digits) {
+ // We dropped digits, and aren't sure if they're before or after the decimal
+ // point. Figure that out now.
+ const char* dp = std::find(begin, end, '.');
+ if (dp != end) {
+ // The dropped trailing digits were after the decimal point, so don't
+ // count them.
+ dropped_digits = 0;
+ }
+ }
+ // Any non-fraction digits we dropped need to be accounted for in our exponent
+ // adjustment.
+ int exponent_adjust = dropped_digits;
+
+ uint32_t queued = 0;
+ int digits_queued = 0;
+ for (; begin != end && significant_digits > 0; ++begin) {
+ if (*begin == '.') {
+ after_decimal_point = true;
+ continue;
+ }
+ if (after_decimal_point) {
+ // For each fractional digit we emit in our parsed integer, adjust our
+ // decimal exponent to compensate.
+ --exponent_adjust;
+ }
+ int digit = (*begin - '0');
+ --significant_digits;
+ if (significant_digits == 0 && std::next(begin) != end &&
+ (digit == 0 || digit == 5)) {
+ // If this is the very last significant digit, but insignificant digits
+ // remain, we know that the last of those remaining significant digits is
+ // nonzero. (If it wasn't, we would have stripped it before we got here.)
+ // So if this final digit is a 0 or 5, adjust it upward by 1.
+ //
+ // This adjustment is what allows incredibly large mantissas ending in
+ // 500000...000000000001 to correctly round up, rather than to nearest.
+ ++digit;
+ }
+ queued = 10 * queued + digit;
+ ++digits_queued;
+ if (digits_queued == kMaxSmallPowerOfTen) {
+ MultiplyBy(kTenToNth[kMaxSmallPowerOfTen]);
+ AddWithCarry(0, queued);
+ queued = digits_queued = 0;
+ }
+ }
+ // Encode any remaining digits.
+ if (digits_queued) {
+ MultiplyBy(kTenToNth[digits_queued]);
+ AddWithCarry(0, queued);
+ }
+
+ // If any insignificant digits remain, we will drop them. But if we have not
+ // yet read the decimal point, then we have to adjust the exponent to account
+ // for the dropped digits.
+ if (begin < end && !after_decimal_point) {
+ // This call to std::find will result in a pointer either to the decimal
+ // point, or to the end of our buffer if there was none.
+ //
+ // Either way, [begin, decimal_point) will contain the set of dropped digits
+ // that require an exponent adjustment.
+ const char* decimal_point = std::find(begin, end, '.');
+ exponent_adjust += (decimal_point - begin);
+ }
+ return exponent_adjust;
+}
+
+template <int max_words>
+/* static */ BigUnsigned<max_words> BigUnsigned<max_words>::FiveToTheNth(
+ int n) {
+ BigUnsigned answer(1u);
+
+ // Seed from the table of large powers, if possible.
+ bool first_pass = true;
+ while (n >= kLargePowerOfFiveStep) {
+ int big_power =
+ std::min(n / kLargePowerOfFiveStep, kLargestPowerOfFiveIndex);
+ if (first_pass) {
+ // just copy, rather than multiplying by 1
+ std::copy(
+ LargePowerOfFiveData(big_power),
+ LargePowerOfFiveData(big_power) + LargePowerOfFiveSize(big_power),
+ answer.words_);
+ answer.size_ = LargePowerOfFiveSize(big_power);
+ first_pass = false;
+ } else {
+ answer.MultiplyBy(LargePowerOfFiveSize(big_power),
+ LargePowerOfFiveData(big_power));
+ }
+ n -= kLargePowerOfFiveStep * big_power;
+ }
+ answer.MultiplyByFiveToTheNth(n);
+ return answer;
+}
+
+template <int max_words>
+void BigUnsigned<max_words>::MultiplyStep(int original_size,
+ const uint32_t* other_words,
+ int other_size, int step) {
+ int this_i = std::min(original_size - 1, step);
+ int other_i = step - this_i;
+
+ uint64_t this_word = 0;
+ uint64_t carry = 0;
+ for (; this_i >= 0 && other_i < other_size; --this_i, ++other_i) {
+ uint64_t product = words_[this_i];
+ product *= other_words[other_i];
+ this_word += product;
+ carry += (this_word >> 32);
+ this_word &= 0xffffffff;
+ }
+ AddWithCarry(step + 1, carry);
+ words_[step] = this_word & 0xffffffff;
+ if (this_word > 0 && size_ <= step) {
+ size_ = step + 1;
+ }
+}
+
+template <int max_words>
+std::string BigUnsigned<max_words>::ToString() const {
+ BigUnsigned<max_words> copy = *this;
+ std::string result;
+ // Build result in reverse order
+ while (copy.size() > 0) {
+ int next_digit = copy.DivMod<10>();
+ result.push_back('0' + next_digit);
+ }
+ if (result.empty()) {
+ result.push_back('0');
+ }
+ std::reverse(result.begin(), result.end());
+ return result;
+}
+
+template class BigUnsigned<4>;
+template class BigUnsigned<84>;
+
+} // namespace strings_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/strings/internal/charconv_bigint.h b/third_party/abseil/src/absl/strings/internal/charconv_bigint.h
new file mode 100644
index 0000000..8f70297
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/internal/charconv_bigint.h
@@ -0,0 +1,423 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_STRINGS_INTERNAL_CHARCONV_BIGINT_H_
+#define ABSL_STRINGS_INTERNAL_CHARCONV_BIGINT_H_
+
+#include <algorithm>
+#include <cstdint>
+#include <iostream>
+#include <string>
+
+#include "absl/base/config.h"
+#include "absl/strings/ascii.h"
+#include "absl/strings/internal/charconv_parse.h"
+#include "absl/strings/string_view.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace strings_internal {
+
+// The largest power that 5 that can be raised to, and still fit in a uint32_t.
+constexpr int kMaxSmallPowerOfFive = 13;
+// The largest power that 10 that can be raised to, and still fit in a uint32_t.
+constexpr int kMaxSmallPowerOfTen = 9;
+
+ABSL_DLL extern const uint32_t
+ kFiveToNth[kMaxSmallPowerOfFive + 1];
+ABSL_DLL extern const uint32_t kTenToNth[kMaxSmallPowerOfTen + 1];
+
+// Large, fixed-width unsigned integer.
+//
+// Exact rounding for decimal-to-binary floating point conversion requires very
+// large integer math, but a design goal of absl::from_chars is to avoid
+// allocating memory. The integer precision needed for decimal-to-binary
+// conversions is large but bounded, so a huge fixed-width integer class
+// suffices.
+//
+// This is an intentionally limited big integer class. Only needed operations
+// are implemented. All storage lives in an array data member, and all
+// arithmetic is done in-place, to avoid requiring separate storage for operand
+// and result.
+//
+// This is an internal class. Some methods live in the .cc file, and are
+// instantiated only for the values of max_words we need.
+template <int max_words>
+class BigUnsigned {
+ public:
+ static_assert(max_words == 4 || max_words == 84,
+ "unsupported max_words value");
+
+ BigUnsigned() : size_(0), words_{} {}
+ explicit constexpr BigUnsigned(uint64_t v)
+ : size_((v >> 32) ? 2 : v ? 1 : 0),
+ words_{static_cast<uint32_t>(v & 0xffffffffu),
+ static_cast<uint32_t>(v >> 32)} {}
+
+ // Constructs a BigUnsigned from the given string_view containing a decimal
+ // value. If the input string is not a decimal integer, constructs a 0
+ // instead.
+ explicit BigUnsigned(absl::string_view sv) : size_(0), words_{} {
+ // Check for valid input, returning a 0 otherwise. This is reasonable
+ // behavior only because this constructor is for unit tests.
+ if (std::find_if_not(sv.begin(), sv.end(), ascii_isdigit) != sv.end() ||
+ sv.empty()) {
+ return;
+ }
+ int exponent_adjust =
+ ReadDigits(sv.data(), sv.data() + sv.size(), Digits10() + 1);
+ if (exponent_adjust > 0) {
+ MultiplyByTenToTheNth(exponent_adjust);
+ }
+ }
+
+ // Loads the mantissa value of a previously-parsed float.
+ //
+ // Returns the associated decimal exponent. The value of the parsed float is
+ // exactly *this * 10**exponent.
+ int ReadFloatMantissa(const ParsedFloat& fp, int significant_digits);
+
+ // Returns the number of decimal digits of precision this type provides. All
+ // numbers with this many decimal digits or fewer are representable by this
+ // type.
+ //
+ // Analagous to std::numeric_limits<BigUnsigned>::digits10.
+ static constexpr int Digits10() {
+ // 9975007/1035508 is very slightly less than log10(2**32).
+ return static_cast<uint64_t>(max_words) * 9975007 / 1035508;
+ }
+
+ // Shifts left by the given number of bits.
+ void ShiftLeft(int count) {
+ if (count > 0) {
+ const int word_shift = count / 32;
+ if (word_shift >= max_words) {
+ SetToZero();
+ return;
+ }
+ size_ = (std::min)(size_ + word_shift, max_words);
+ count %= 32;
+ if (count == 0) {
+ std::copy_backward(words_, words_ + size_ - word_shift, words_ + size_);
+ } else {
+ for (int i = (std::min)(size_, max_words - 1); i > word_shift; --i) {
+ words_[i] = (words_[i - word_shift] << count) |
+ (words_[i - word_shift - 1] >> (32 - count));
+ }
+ words_[word_shift] = words_[0] << count;
+ // Grow size_ if necessary.
+ if (size_ < max_words && words_[size_]) {
+ ++size_;
+ }
+ }
+ std::fill(words_, words_ + word_shift, 0u);
+ }
+ }
+
+
+ // Multiplies by v in-place.
+ void MultiplyBy(uint32_t v) {
+ if (size_ == 0 || v == 1) {
+ return;
+ }
+ if (v == 0) {
+ SetToZero();
+ return;
+ }
+ const uint64_t factor = v;
+ uint64_t window = 0;
+ for (int i = 0; i < size_; ++i) {
+ window += factor * words_[i];
+ words_[i] = window & 0xffffffff;
+ window >>= 32;
+ }
+ // If carry bits remain and there's space for them, grow size_.
+ if (window && size_ < max_words) {
+ words_[size_] = window & 0xffffffff;
+ ++size_;
+ }
+ }
+
+ void MultiplyBy(uint64_t v) {
+ uint32_t words[2];
+ words[0] = static_cast<uint32_t>(v);
+ words[1] = static_cast<uint32_t>(v >> 32);
+ if (words[1] == 0) {
+ MultiplyBy(words[0]);
+ } else {
+ MultiplyBy(2, words);
+ }
+ }
+
+ // Multiplies in place by 5 to the power of n. n must be non-negative.
+ void MultiplyByFiveToTheNth(int n) {
+ while (n >= kMaxSmallPowerOfFive) {
+ MultiplyBy(kFiveToNth[kMaxSmallPowerOfFive]);
+ n -= kMaxSmallPowerOfFive;
+ }
+ if (n > 0) {
+ MultiplyBy(kFiveToNth[n]);
+ }
+ }
+
+ // Multiplies in place by 10 to the power of n. n must be non-negative.
+ void MultiplyByTenToTheNth(int n) {
+ if (n > kMaxSmallPowerOfTen) {
+ // For large n, raise to a power of 5, then shift left by the same amount.
+ // (10**n == 5**n * 2**n.) This requires fewer multiplications overall.
+ MultiplyByFiveToTheNth(n);
+ ShiftLeft(n);
+ } else if (n > 0) {
+ // We can do this more quickly for very small N by using a single
+ // multiplication.
+ MultiplyBy(kTenToNth[n]);
+ }
+ }
+
+ // Returns the value of 5**n, for non-negative n. This implementation uses
+ // a lookup table, and is faster then seeding a BigUnsigned with 1 and calling
+ // MultiplyByFiveToTheNth().
+ static BigUnsigned FiveToTheNth(int n);
+
+ // Multiplies by another BigUnsigned, in-place.
+ template <int M>
+ void MultiplyBy(const BigUnsigned<M>& other) {
+ MultiplyBy(other.size(), other.words());
+ }
+
+ void SetToZero() {
+ std::fill(words_, words_ + size_, 0u);
+ size_ = 0;
+ }
+
+ // Returns the value of the nth word of this BigUnsigned. This is
+ // range-checked, and returns 0 on out-of-bounds accesses.
+ uint32_t GetWord(int index) const {
+ if (index < 0 || index >= size_) {
+ return 0;
+ }
+ return words_[index];
+ }
+
+ // Returns this integer as a decimal string. This is not used in the decimal-
+ // to-binary conversion; it is intended to aid in testing.
+ std::string ToString() const;
+
+ int size() const { return size_; }
+ const uint32_t* words() const { return words_; }
+
+ private:
+ // Reads the number between [begin, end), possibly containing a decimal point,
+ // into this BigUnsigned.
+ //
+ // Callers are required to ensure [begin, end) contains a valid number, with
+ // one or more decimal digits and at most one decimal point. This routine
+ // will behave unpredictably if these preconditions are not met.
+ //
+ // Only the first `significant_digits` digits are read. Digits beyond this
+ // limit are "sticky": If the final significant digit is 0 or 5, and if any
+ // dropped digit is nonzero, then that final significant digit is adjusted up
+ // to 1 or 6. This adjustment allows for precise rounding.
+ //
+ // Returns `exponent_adjustment`, a power-of-ten exponent adjustment to
+ // account for the decimal point and for dropped significant digits. After
+ // this function returns,
+ // actual_value_of_parsed_string ~= *this * 10**exponent_adjustment.
+ int ReadDigits(const char* begin, const char* end, int significant_digits);
+
+ // Performs a step of big integer multiplication. This computes the full
+ // (64-bit-wide) values that should be added at the given index (step), and
+ // adds to that location in-place.
+ //
+ // Because our math all occurs in place, we must multiply starting from the
+ // highest word working downward. (This is a bit more expensive due to the
+ // extra carries involved.)
+ //
+ // This must be called in steps, for each word to be calculated, starting from
+ // the high end and working down to 0. The first value of `step` should be
+ // `std::min(original_size + other.size_ - 2, max_words - 1)`.
+ // The reason for this expression is that multiplying the i'th word from one
+ // multiplicand and the j'th word of another multiplicand creates a
+ // two-word-wide value to be stored at the (i+j)'th element. The highest
+ // word indices we will access are `original_size - 1` from this object, and
+ // `other.size_ - 1` from our operand. Therefore,
+ // `original_size + other.size_ - 2` is the first step we should calculate,
+ // but limited on an upper bound by max_words.
+
+ // Working from high-to-low ensures that we do not overwrite the portions of
+ // the initial value of *this which are still needed for later steps.
+ //
+ // Once called with step == 0, *this contains the result of the
+ // multiplication.
+ //
+ // `original_size` is the size_ of *this before the first call to
+ // MultiplyStep(). `other_words` and `other_size` are the contents of our
+ // operand. `step` is the step to perform, as described above.
+ void MultiplyStep(int original_size, const uint32_t* other_words,
+ int other_size, int step);
+
+ void MultiplyBy(int other_size, const uint32_t* other_words) {
+ const int original_size = size_;
+ const int first_step =
+ (std::min)(original_size + other_size - 2, max_words - 1);
+ for (int step = first_step; step >= 0; --step) {
+ MultiplyStep(original_size, other_words, other_size, step);
+ }
+ }
+
+ // Adds a 32-bit value to the index'th word, with carry.
+ void AddWithCarry(int index, uint32_t value) {
+ if (value) {
+ while (index < max_words && value > 0) {
+ words_[index] += value;
+ // carry if we overflowed in this word:
+ if (value > words_[index]) {
+ value = 1;
+ ++index;
+ } else {
+ value = 0;
+ }
+ }
+ size_ = (std::min)(max_words, (std::max)(index + 1, size_));
+ }
+ }
+
+ void AddWithCarry(int index, uint64_t value) {
+ if (value && index < max_words) {
+ uint32_t high = value >> 32;
+ uint32_t low = value & 0xffffffff;
+ words_[index] += low;
+ if (words_[index] < low) {
+ ++high;
+ if (high == 0) {
+ // Carry from the low word caused our high word to overflow.
+ // Short circuit here to do the right thing.
+ AddWithCarry(index + 2, static_cast<uint32_t>(1));
+ return;
+ }
+ }
+ if (high > 0) {
+ AddWithCarry(index + 1, high);
+ } else {
+ // Normally 32-bit AddWithCarry() sets size_, but since we don't call
+ // it when `high` is 0, do it ourselves here.
+ size_ = (std::min)(max_words, (std::max)(index + 1, size_));
+ }
+ }
+ }
+
+ // Divide this in place by a constant divisor. Returns the remainder of the
+ // division.
+ template <uint32_t divisor>
+ uint32_t DivMod() {
+ uint64_t accumulator = 0;
+ for (int i = size_ - 1; i >= 0; --i) {
+ accumulator <<= 32;
+ accumulator += words_[i];
+ // accumulator / divisor will never overflow an int32_t in this loop
+ words_[i] = static_cast<uint32_t>(accumulator / divisor);
+ accumulator = accumulator % divisor;
+ }
+ while (size_ > 0 && words_[size_ - 1] == 0) {
+ --size_;
+ }
+ return static_cast<uint32_t>(accumulator);
+ }
+
+ // The number of elements in words_ that may carry significant values.
+ // All elements beyond this point are 0.
+ //
+ // When size_ is 0, this BigUnsigned stores the value 0.
+ // When size_ is nonzero, is *not* guaranteed that words_[size_ - 1] is
+ // nonzero. This can occur due to overflow truncation.
+ // In particular, x.size_ != y.size_ does *not* imply x != y.
+ int size_;
+ uint32_t words_[max_words];
+};
+
+// Compares two big integer instances.
+//
+// Returns -1 if lhs < rhs, 0 if lhs == rhs, and 1 if lhs > rhs.
+template <int N, int M>
+int Compare(const BigUnsigned<N>& lhs, const BigUnsigned<M>& rhs) {
+ int limit = (std::max)(lhs.size(), rhs.size());
+ for (int i = limit - 1; i >= 0; --i) {
+ const uint32_t lhs_word = lhs.GetWord(i);
+ const uint32_t rhs_word = rhs.GetWord(i);
+ if (lhs_word < rhs_word) {
+ return -1;
+ } else if (lhs_word > rhs_word) {
+ return 1;
+ }
+ }
+ return 0;
+}
+
+template <int N, int M>
+bool operator==(const BigUnsigned<N>& lhs, const BigUnsigned<M>& rhs) {
+ int limit = (std::max)(lhs.size(), rhs.size());
+ for (int i = 0; i < limit; ++i) {
+ if (lhs.GetWord(i) != rhs.GetWord(i)) {
+ return false;
+ }
+ }
+ return true;
+}
+
+template <int N, int M>
+bool operator!=(const BigUnsigned<N>& lhs, const BigUnsigned<M>& rhs) {
+ return !(lhs == rhs);
+}
+
+template <int N, int M>
+bool operator<(const BigUnsigned<N>& lhs, const BigUnsigned<M>& rhs) {
+ return Compare(lhs, rhs) == -1;
+}
+
+template <int N, int M>
+bool operator>(const BigUnsigned<N>& lhs, const BigUnsigned<M>& rhs) {
+ return rhs < lhs;
+}
+template <int N, int M>
+bool operator<=(const BigUnsigned<N>& lhs, const BigUnsigned<M>& rhs) {
+ return !(rhs < lhs);
+}
+template <int N, int M>
+bool operator>=(const BigUnsigned<N>& lhs, const BigUnsigned<M>& rhs) {
+ return !(lhs < rhs);
+}
+
+// Output operator for BigUnsigned, for testing purposes only.
+template <int N>
+std::ostream& operator<<(std::ostream& os, const BigUnsigned<N>& num) {
+ return os << num.ToString();
+}
+
+// Explicit instantiation declarations for the sizes of BigUnsigned that we
+// are using.
+//
+// For now, the choices of 4 and 84 are arbitrary; 4 is a small value that is
+// still bigger than an int128, and 84 is a large value we will want to use
+// in the from_chars implementation.
+//
+// Comments justifying the use of 84 belong in the from_chars implementation,
+// and will be added in a follow-up CL.
+extern template class BigUnsigned<4>;
+extern template class BigUnsigned<84>;
+
+} // namespace strings_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_STRINGS_INTERNAL_CHARCONV_BIGINT_H_
diff --git a/third_party/abseil/src/absl/strings/internal/charconv_bigint_test.cc b/third_party/abseil/src/absl/strings/internal/charconv_bigint_test.cc
new file mode 100644
index 0000000..a8b9945
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/internal/charconv_bigint_test.cc
@@ -0,0 +1,260 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/strings/internal/charconv_bigint.h"
+
+#include <string>
+
+#include "gtest/gtest.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace strings_internal {
+
+TEST(BigUnsigned, ShiftLeft) {
+ {
+ // Check that 3 * 2**100 is calculated correctly
+ BigUnsigned<4> num(3u);
+ num.ShiftLeft(100);
+ EXPECT_EQ(num, BigUnsigned<4>("3802951800684688204490109616128"));
+ }
+ {
+ // Test that overflow is truncated properly.
+ // 15 is 4 bits long, and BigUnsigned<4> is a 128-bit bigint.
+ // Shifting left by 125 bits should truncate off the high bit, so that
+ // 15 << 125 == 7 << 125
+ // after truncation.
+ BigUnsigned<4> a(15u);
+ BigUnsigned<4> b(7u);
+ BigUnsigned<4> c(3u);
+ a.ShiftLeft(125);
+ b.ShiftLeft(125);
+ c.ShiftLeft(125);
+ EXPECT_EQ(a, b);
+ EXPECT_NE(a, c);
+ }
+ {
+ // Same test, larger bigint:
+ BigUnsigned<84> a(15u);
+ BigUnsigned<84> b(7u);
+ BigUnsigned<84> c(3u);
+ a.ShiftLeft(84 * 32 - 3);
+ b.ShiftLeft(84 * 32 - 3);
+ c.ShiftLeft(84 * 32 - 3);
+ EXPECT_EQ(a, b);
+ EXPECT_NE(a, c);
+ }
+ {
+ // Check that incrementally shifting has the same result as doing it all at
+ // once (attempting to capture corner cases.)
+ const std::string seed = "1234567890123456789012345678901234567890";
+ BigUnsigned<84> a(seed);
+ for (int i = 1; i <= 84 * 32; ++i) {
+ a.ShiftLeft(1);
+ BigUnsigned<84> b(seed);
+ b.ShiftLeft(i);
+ EXPECT_EQ(a, b);
+ }
+ // And we should have fully rotated all bits off by now:
+ EXPECT_EQ(a, BigUnsigned<84>(0u));
+ }
+ {
+ // Bit shifting large and small numbers by large and small offsets.
+ // Intended to exercise bounds-checking corner on ShiftLeft() (directly
+ // and under asan).
+
+ // 2**(32*84)-1
+ const BigUnsigned<84> all_bits_one(
+ "1474444211396924248063325089479706787923460402125687709454567433186613"
+ "6228083464060749874845919674257665016359189106695900028098437021384227"
+ "3285029708032466536084583113729486015826557532750465299832071590813090"
+ "2011853039837649252477307070509704043541368002938784757296893793903797"
+ "8180292336310543540677175225040919704702800559606097685920595947397024"
+ "8303316808753252115729411497720357971050627997031988036134171378490368"
+ "6008000778741115399296162550786288457245180872759047016734959330367829"
+ "5235612397427686310674725251378116268607113017720538636924549612987647"
+ "5767411074510311386444547332882472126067840027882117834454260409440463"
+ "9345147252664893456053258463203120637089916304618696601333953616715125"
+ "2115882482473279040772264257431663818610405673876655957323083702713344"
+ "4201105427930770976052393421467136557055");
+ const BigUnsigned<84> zero(0u);
+ const BigUnsigned<84> one(1u);
+ // in bounds shifts
+ for (int i = 1; i < 84*32; ++i) {
+ // shifting all_bits_one to the left should result in a smaller number,
+ // since the high bits rotate off and the low bits are replaced with
+ // zeroes.
+ BigUnsigned<84> big_shifted = all_bits_one;
+ big_shifted.ShiftLeft(i);
+ EXPECT_GT(all_bits_one, big_shifted);
+ // Shifting 1 to the left should instead result in a larger number.
+ BigUnsigned<84> small_shifted = one;
+ small_shifted.ShiftLeft(i);
+ EXPECT_LT(one, small_shifted);
+ }
+ // Shifting by zero or a negative number has no effect
+ for (int no_op_shift : {0, -1, -84 * 32, std::numeric_limits<int>::min()}) {
+ BigUnsigned<84> big_shifted = all_bits_one;
+ big_shifted.ShiftLeft(no_op_shift);
+ EXPECT_EQ(all_bits_one, big_shifted);
+ BigUnsigned<84> small_shifted = one;
+ big_shifted.ShiftLeft(no_op_shift);
+ EXPECT_EQ(one, small_shifted);
+ }
+ // Shifting by an amount greater than the number of bits should result in
+ // zero.
+ for (int out_of_bounds_shift :
+ {84 * 32, 84 * 32 + 1, std::numeric_limits<int>::max()}) {
+ BigUnsigned<84> big_shifted = all_bits_one;
+ big_shifted.ShiftLeft(out_of_bounds_shift);
+ EXPECT_EQ(zero, big_shifted);
+ BigUnsigned<84> small_shifted = one;
+ small_shifted.ShiftLeft(out_of_bounds_shift);
+ EXPECT_EQ(zero, small_shifted);
+ }
+ }
+}
+
+TEST(BigUnsigned, MultiplyByUint32) {
+ const BigUnsigned<84> factorial_100(
+ "933262154439441526816992388562667004907159682643816214685929638952175999"
+ "932299156089414639761565182862536979208272237582511852109168640000000000"
+ "00000000000000");
+ BigUnsigned<84> a(1u);
+ for (uint32_t i = 1; i <= 100; ++i) {
+ a.MultiplyBy(i);
+ }
+ EXPECT_EQ(a, BigUnsigned<84>(factorial_100));
+}
+
+TEST(BigUnsigned, MultiplyByBigUnsigned) {
+ {
+ // Put the terms of factorial_200 into two bigints, and multiply them
+ // together.
+ const BigUnsigned<84> factorial_200(
+ "7886578673647905035523632139321850622951359776871732632947425332443594"
+ "4996340334292030428401198462390417721213891963883025764279024263710506"
+ "1926624952829931113462857270763317237396988943922445621451664240254033"
+ "2918641312274282948532775242424075739032403212574055795686602260319041"
+ "7032406235170085879617892222278962370389737472000000000000000000000000"
+ "0000000000000000000000000");
+ BigUnsigned<84> evens(1u);
+ BigUnsigned<84> odds(1u);
+ for (uint32_t i = 1; i < 200; i += 2) {
+ odds.MultiplyBy(i);
+ evens.MultiplyBy(i + 1);
+ }
+ evens.MultiplyBy(odds);
+ EXPECT_EQ(evens, factorial_200);
+ }
+ {
+ // Multiply various powers of 10 together.
+ for (int a = 0 ; a < 700; a += 25) {
+ SCOPED_TRACE(a);
+ BigUnsigned<84> a_value("3" + std::string(a, '0'));
+ for (int b = 0; b < (700 - a); b += 25) {
+ SCOPED_TRACE(b);
+ BigUnsigned<84> b_value("2" + std::string(b, '0'));
+ BigUnsigned<84> expected_product("6" + std::string(a + b, '0'));
+ b_value.MultiplyBy(a_value);
+ EXPECT_EQ(b_value, expected_product);
+ }
+ }
+ }
+}
+
+TEST(BigUnsigned, MultiplyByOverflow) {
+ {
+ // Check that multiplcation overflow predictably truncates.
+
+ // A big int with all bits on.
+ BigUnsigned<4> all_bits_on("340282366920938463463374607431768211455");
+ // Modulo 2**128, this is equal to -1. Therefore the square of this,
+ // modulo 2**128, should be 1.
+ all_bits_on.MultiplyBy(all_bits_on);
+ EXPECT_EQ(all_bits_on, BigUnsigned<4>(1u));
+ }
+ {
+ // Try multiplying a large bigint by 2**50, and compare the result to
+ // shifting.
+ BigUnsigned<4> value_1("12345678901234567890123456789012345678");
+ BigUnsigned<4> value_2("12345678901234567890123456789012345678");
+ BigUnsigned<4> two_to_fiftieth(1u);
+ two_to_fiftieth.ShiftLeft(50);
+
+ value_1.ShiftLeft(50);
+ value_2.MultiplyBy(two_to_fiftieth);
+ EXPECT_EQ(value_1, value_2);
+ }
+}
+
+TEST(BigUnsigned, FiveToTheNth) {
+ {
+ // Sanity check that MultiplyByFiveToTheNth gives consistent answers, up to
+ // and including overflow.
+ for (int i = 0; i < 1160; ++i) {
+ SCOPED_TRACE(i);
+ BigUnsigned<84> value_1(123u);
+ BigUnsigned<84> value_2(123u);
+ value_1.MultiplyByFiveToTheNth(i);
+ for (int j = 0; j < i; j++) {
+ value_2.MultiplyBy(5u);
+ }
+ EXPECT_EQ(value_1, value_2);
+ }
+ }
+ {
+ // Check that the faster, table-lookup-based static method returns the same
+ // result that multiplying in-place would return, up to and including
+ // overflow.
+ for (int i = 0; i < 1160; ++i) {
+ SCOPED_TRACE(i);
+ BigUnsigned<84> value_1(1u);
+ value_1.MultiplyByFiveToTheNth(i);
+ BigUnsigned<84> value_2 = BigUnsigned<84>::FiveToTheNth(i);
+ EXPECT_EQ(value_1, value_2);
+ }
+ }
+}
+
+TEST(BigUnsigned, TenToTheNth) {
+ {
+ // Sanity check MultiplyByTenToTheNth.
+ for (int i = 0; i < 800; ++i) {
+ SCOPED_TRACE(i);
+ BigUnsigned<84> value_1(123u);
+ BigUnsigned<84> value_2(123u);
+ value_1.MultiplyByTenToTheNth(i);
+ for (int j = 0; j < i; j++) {
+ value_2.MultiplyBy(10u);
+ }
+ EXPECT_EQ(value_1, value_2);
+ }
+ }
+ {
+ // Alternate testing approach, taking advantage of the decimal parser.
+ for (int i = 0; i < 200; ++i) {
+ SCOPED_TRACE(i);
+ BigUnsigned<84> value_1(135u);
+ value_1.MultiplyByTenToTheNth(i);
+ BigUnsigned<84> value_2("135" + std::string(i, '0'));
+ EXPECT_EQ(value_1, value_2);
+ }
+ }
+}
+
+
+} // namespace strings_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/strings/internal/charconv_parse.cc b/third_party/abseil/src/absl/strings/internal/charconv_parse.cc
new file mode 100644
index 0000000..8b11868
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/internal/charconv_parse.cc
@@ -0,0 +1,504 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/strings/internal/charconv_parse.h"
+#include "absl/strings/charconv.h"
+
+#include <cassert>
+#include <cstdint>
+#include <limits>
+
+#include "absl/strings/internal/memutil.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace {
+
+// ParseFloat<10> will read the first 19 significant digits of the mantissa.
+// This number was chosen for multiple reasons.
+//
+// (a) First, for whatever integer type we choose to represent the mantissa, we
+// want to choose the largest possible number of decimal digits for that integer
+// type. We are using uint64_t, which can express any 19-digit unsigned
+// integer.
+//
+// (b) Second, we need to parse enough digits that the binary value of any
+// mantissa we capture has more bits of resolution than the mantissa
+// representation in the target float. Our algorithm requires at least 3 bits
+// of headway, but 19 decimal digits give a little more than that.
+//
+// The following static assertions verify the above comments:
+constexpr int kDecimalMantissaDigitsMax = 19;
+
+static_assert(std::numeric_limits<uint64_t>::digits10 ==
+ kDecimalMantissaDigitsMax,
+ "(a) above");
+
+// IEEE doubles, which we assume in Abseil, have 53 binary bits of mantissa.
+static_assert(std::numeric_limits<double>::is_iec559, "IEEE double assumed");
+static_assert(std::numeric_limits<double>::radix == 2, "IEEE double fact");
+static_assert(std::numeric_limits<double>::digits == 53, "IEEE double fact");
+
+// The lowest valued 19-digit decimal mantissa we can read still contains
+// sufficient information to reconstruct a binary mantissa.
+static_assert(1000000000000000000u > (uint64_t(1) << (53 + 3)), "(b) above");
+
+// ParseFloat<16> will read the first 15 significant digits of the mantissa.
+//
+// Because a base-16-to-base-2 conversion can be done exactly, we do not need
+// to maximize the number of scanned hex digits to improve our conversion. What
+// is required is to scan two more bits than the mantissa can represent, so that
+// we always round correctly.
+//
+// (One extra bit does not suffice to perform correct rounding, since a number
+// exactly halfway between two representable floats has unique rounding rules,
+// so we need to differentiate between a "halfway between" number and a "closer
+// to the larger value" number.)
+constexpr int kHexadecimalMantissaDigitsMax = 15;
+
+// The minimum number of significant bits that will be read from
+// kHexadecimalMantissaDigitsMax hex digits. We must subtract by three, since
+// the most significant digit can be a "1", which only contributes a single
+// significant bit.
+constexpr int kGuaranteedHexadecimalMantissaBitPrecision =
+ 4 * kHexadecimalMantissaDigitsMax - 3;
+
+static_assert(kGuaranteedHexadecimalMantissaBitPrecision >
+ std::numeric_limits<double>::digits + 2,
+ "kHexadecimalMantissaDigitsMax too small");
+
+// We also impose a limit on the number of significant digits we will read from
+// an exponent, to avoid having to deal with integer overflow. We use 9 for
+// this purpose.
+//
+// If we read a 9 digit exponent, the end result of the conversion will
+// necessarily be infinity or zero, depending on the sign of the exponent.
+// Therefore we can just drop extra digits on the floor without any extra
+// logic.
+constexpr int kDecimalExponentDigitsMax = 9;
+static_assert(std::numeric_limits<int>::digits10 >= kDecimalExponentDigitsMax,
+ "int type too small");
+
+// To avoid incredibly large inputs causing integer overflow for our exponent,
+// we impose an arbitrary but very large limit on the number of significant
+// digits we will accept. The implementation refuses to match a string with
+// more consecutive significant mantissa digits than this.
+constexpr int kDecimalDigitLimit = 50000000;
+
+// Corresponding limit for hexadecimal digit inputs. This is one fourth the
+// amount of kDecimalDigitLimit, since each dropped hexadecimal digit requires
+// a binary exponent adjustment of 4.
+constexpr int kHexadecimalDigitLimit = kDecimalDigitLimit / 4;
+
+// The largest exponent we can read is 999999999 (per
+// kDecimalExponentDigitsMax), and the largest exponent adjustment we can get
+// from dropped mantissa digits is 2 * kDecimalDigitLimit, and the sum of these
+// comfortably fits in an integer.
+//
+// We count kDecimalDigitLimit twice because there are independent limits for
+// numbers before and after the decimal point. (In the case where there are no
+// significant digits before the decimal point, there are independent limits for
+// post-decimal-point leading zeroes and for significant digits.)
+static_assert(999999999 + 2 * kDecimalDigitLimit <
+ std::numeric_limits<int>::max(),
+ "int type too small");
+static_assert(999999999 + 2 * (4 * kHexadecimalDigitLimit) <
+ std::numeric_limits<int>::max(),
+ "int type too small");
+
+// Returns true if the provided bitfield allows parsing an exponent value
+// (e.g., "1.5e100").
+bool AllowExponent(chars_format flags) {
+ bool fixed = (flags & chars_format::fixed) == chars_format::fixed;
+ bool scientific =
+ (flags & chars_format::scientific) == chars_format::scientific;
+ return scientific || !fixed;
+}
+
+// Returns true if the provided bitfield requires an exponent value be present.
+bool RequireExponent(chars_format flags) {
+ bool fixed = (flags & chars_format::fixed) == chars_format::fixed;
+ bool scientific =
+ (flags & chars_format::scientific) == chars_format::scientific;
+ return scientific && !fixed;
+}
+
+const int8_t kAsciiToInt[256] = {
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8,
+ 9, -1, -1, -1, -1, -1, -1, -1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1};
+
+// Returns true if `ch` is a digit in the given base
+template <int base>
+bool IsDigit(char ch);
+
+// Converts a valid `ch` to its digit value in the given base.
+template <int base>
+unsigned ToDigit(char ch);
+
+// Returns true if `ch` is the exponent delimiter for the given base.
+template <int base>
+bool IsExponentCharacter(char ch);
+
+// Returns the maximum number of significant digits we will read for a float
+// in the given base.
+template <int base>
+constexpr int MantissaDigitsMax();
+
+// Returns the largest consecutive run of digits we will accept when parsing a
+// number in the given base.
+template <int base>
+constexpr int DigitLimit();
+
+// Returns the amount the exponent must be adjusted by for each dropped digit.
+// (For decimal this is 1, since the digits are in base 10 and the exponent base
+// is also 10, but for hexadecimal this is 4, since the digits are base 16 but
+// the exponent base is 2.)
+template <int base>
+constexpr int DigitMagnitude();
+
+template <>
+bool IsDigit<10>(char ch) {
+ return ch >= '0' && ch <= '9';
+}
+template <>
+bool IsDigit<16>(char ch) {
+ return kAsciiToInt[static_cast<unsigned char>(ch)] >= 0;
+}
+
+template <>
+unsigned ToDigit<10>(char ch) {
+ return ch - '0';
+}
+template <>
+unsigned ToDigit<16>(char ch) {
+ return kAsciiToInt[static_cast<unsigned char>(ch)];
+}
+
+template <>
+bool IsExponentCharacter<10>(char ch) {
+ return ch == 'e' || ch == 'E';
+}
+
+template <>
+bool IsExponentCharacter<16>(char ch) {
+ return ch == 'p' || ch == 'P';
+}
+
+template <>
+constexpr int MantissaDigitsMax<10>() {
+ return kDecimalMantissaDigitsMax;
+}
+template <>
+constexpr int MantissaDigitsMax<16>() {
+ return kHexadecimalMantissaDigitsMax;
+}
+
+template <>
+constexpr int DigitLimit<10>() {
+ return kDecimalDigitLimit;
+}
+template <>
+constexpr int DigitLimit<16>() {
+ return kHexadecimalDigitLimit;
+}
+
+template <>
+constexpr int DigitMagnitude<10>() {
+ return 1;
+}
+template <>
+constexpr int DigitMagnitude<16>() {
+ return 4;
+}
+
+// Reads decimal digits from [begin, end) into *out. Returns the number of
+// digits consumed.
+//
+// After max_digits has been read, keeps consuming characters, but no longer
+// adjusts *out. If a nonzero digit is dropped this way, *dropped_nonzero_digit
+// is set; otherwise, it is left unmodified.
+//
+// If no digits are matched, returns 0 and leaves *out unchanged.
+//
+// ConsumeDigits does not protect against overflow on *out; max_digits must
+// be chosen with respect to type T to avoid the possibility of overflow.
+template <int base, typename T>
+int ConsumeDigits(const char* begin, const char* end, int max_digits, T* out,
+ bool* dropped_nonzero_digit) {
+ if (base == 10) {
+ assert(max_digits <= std::numeric_limits<T>::digits10);
+ } else if (base == 16) {
+ assert(max_digits * 4 <= std::numeric_limits<T>::digits);
+ }
+ const char* const original_begin = begin;
+
+ // Skip leading zeros, but only if *out is zero.
+ // They don't cause an overflow so we don't have to count them for
+ // `max_digits`.
+ while (!*out && end != begin && *begin == '0') ++begin;
+
+ T accumulator = *out;
+ const char* significant_digits_end =
+ (end - begin > max_digits) ? begin + max_digits : end;
+ while (begin < significant_digits_end && IsDigit<base>(*begin)) {
+ // Do not guard against *out overflow; max_digits was chosen to avoid this.
+ // Do assert against it, to detect problems in debug builds.
+ auto digit = static_cast<T>(ToDigit<base>(*begin));
+ assert(accumulator * base >= accumulator);
+ accumulator *= base;
+ assert(accumulator + digit >= accumulator);
+ accumulator += digit;
+ ++begin;
+ }
+ bool dropped_nonzero = false;
+ while (begin < end && IsDigit<base>(*begin)) {
+ dropped_nonzero = dropped_nonzero || (*begin != '0');
+ ++begin;
+ }
+ if (dropped_nonzero && dropped_nonzero_digit != nullptr) {
+ *dropped_nonzero_digit = true;
+ }
+ *out = accumulator;
+ return static_cast<int>(begin - original_begin);
+}
+
+// Returns true if `v` is one of the chars allowed inside parentheses following
+// a NaN.
+bool IsNanChar(char v) {
+ return (v == '_') || (v >= '0' && v <= '9') || (v >= 'a' && v <= 'z') ||
+ (v >= 'A' && v <= 'Z');
+}
+
+// Checks the range [begin, end) for a strtod()-formatted infinity or NaN. If
+// one is found, sets `out` appropriately and returns true.
+bool ParseInfinityOrNan(const char* begin, const char* end,
+ strings_internal::ParsedFloat* out) {
+ if (end - begin < 3) {
+ return false;
+ }
+ switch (*begin) {
+ case 'i':
+ case 'I': {
+ // An infinity string consists of the characters "inf" or "infinity",
+ // case insensitive.
+ if (strings_internal::memcasecmp(begin + 1, "nf", 2) != 0) {
+ return false;
+ }
+ out->type = strings_internal::FloatType::kInfinity;
+ if (end - begin >= 8 &&
+ strings_internal::memcasecmp(begin + 3, "inity", 5) == 0) {
+ out->end = begin + 8;
+ } else {
+ out->end = begin + 3;
+ }
+ return true;
+ }
+ case 'n':
+ case 'N': {
+ // A NaN consists of the characters "nan", case insensitive, optionally
+ // followed by a parenthesized sequence of zero or more alphanumeric
+ // characters and/or underscores.
+ if (strings_internal::memcasecmp(begin + 1, "an", 2) != 0) {
+ return false;
+ }
+ out->type = strings_internal::FloatType::kNan;
+ out->end = begin + 3;
+ // NaN is allowed to be followed by a parenthesized string, consisting of
+ // only the characters [a-zA-Z0-9_]. Match that if it's present.
+ begin += 3;
+ if (begin < end && *begin == '(') {
+ const char* nan_begin = begin + 1;
+ while (nan_begin < end && IsNanChar(*nan_begin)) {
+ ++nan_begin;
+ }
+ if (nan_begin < end && *nan_begin == ')') {
+ // We found an extra NaN specifier range
+ out->subrange_begin = begin + 1;
+ out->subrange_end = nan_begin;
+ out->end = nan_begin + 1;
+ }
+ }
+ return true;
+ }
+ default:
+ return false;
+ }
+}
+} // namespace
+
+namespace strings_internal {
+
+template <int base>
+strings_internal::ParsedFloat ParseFloat(const char* begin, const char* end,
+ chars_format format_flags) {
+ strings_internal::ParsedFloat result;
+
+ // Exit early if we're given an empty range.
+ if (begin == end) return result;
+
+ // Handle the infinity and NaN cases.
+ if (ParseInfinityOrNan(begin, end, &result)) {
+ return result;
+ }
+
+ const char* const mantissa_begin = begin;
+ while (begin < end && *begin == '0') {
+ ++begin; // skip leading zeros
+ }
+ uint64_t mantissa = 0;
+
+ int exponent_adjustment = 0;
+ bool mantissa_is_inexact = false;
+ int pre_decimal_digits = ConsumeDigits<base>(
+ begin, end, MantissaDigitsMax<base>(), &mantissa, &mantissa_is_inexact);
+ begin += pre_decimal_digits;
+ int digits_left;
+ if (pre_decimal_digits >= DigitLimit<base>()) {
+ // refuse to parse pathological inputs
+ return result;
+ } else if (pre_decimal_digits > MantissaDigitsMax<base>()) {
+ // We dropped some non-fraction digits on the floor. Adjust our exponent
+ // to compensate.
+ exponent_adjustment =
+ static_cast<int>(pre_decimal_digits - MantissaDigitsMax<base>());
+ digits_left = 0;
+ } else {
+ digits_left =
+ static_cast<int>(MantissaDigitsMax<base>() - pre_decimal_digits);
+ }
+ if (begin < end && *begin == '.') {
+ ++begin;
+ if (mantissa == 0) {
+ // If we haven't seen any nonzero digits yet, keep skipping zeros. We
+ // have to adjust the exponent to reflect the changed place value.
+ const char* begin_zeros = begin;
+ while (begin < end && *begin == '0') {
+ ++begin;
+ }
+ int zeros_skipped = static_cast<int>(begin - begin_zeros);
+ if (zeros_skipped >= DigitLimit<base>()) {
+ // refuse to parse pathological inputs
+ return result;
+ }
+ exponent_adjustment -= static_cast<int>(zeros_skipped);
+ }
+ int post_decimal_digits = ConsumeDigits<base>(
+ begin, end, digits_left, &mantissa, &mantissa_is_inexact);
+ begin += post_decimal_digits;
+
+ // Since `mantissa` is an integer, each significant digit we read after
+ // the decimal point requires an adjustment to the exponent. "1.23e0" will
+ // be stored as `mantissa` == 123 and `exponent` == -2 (that is,
+ // "123e-2").
+ if (post_decimal_digits >= DigitLimit<base>()) {
+ // refuse to parse pathological inputs
+ return result;
+ } else if (post_decimal_digits > digits_left) {
+ exponent_adjustment -= digits_left;
+ } else {
+ exponent_adjustment -= post_decimal_digits;
+ }
+ }
+ // If we've found no mantissa whatsoever, this isn't a number.
+ if (mantissa_begin == begin) {
+ return result;
+ }
+ // A bare "." doesn't count as a mantissa either.
+ if (begin - mantissa_begin == 1 && *mantissa_begin == '.') {
+ return result;
+ }
+
+ if (mantissa_is_inexact) {
+ // We dropped significant digits on the floor. Handle this appropriately.
+ if (base == 10) {
+ // If we truncated significant decimal digits, store the full range of the
+ // mantissa for future big integer math for exact rounding.
+ result.subrange_begin = mantissa_begin;
+ result.subrange_end = begin;
+ } else if (base == 16) {
+ // If we truncated hex digits, reflect this fact by setting the low
+ // ("sticky") bit. This allows for correct rounding in all cases.
+ mantissa |= 1;
+ }
+ }
+ result.mantissa = mantissa;
+
+ const char* const exponent_begin = begin;
+ result.literal_exponent = 0;
+ bool found_exponent = false;
+ if (AllowExponent(format_flags) && begin < end &&
+ IsExponentCharacter<base>(*begin)) {
+ bool negative_exponent = false;
+ ++begin;
+ if (begin < end && *begin == '-') {
+ negative_exponent = true;
+ ++begin;
+ } else if (begin < end && *begin == '+') {
+ ++begin;
+ }
+ const char* const exponent_digits_begin = begin;
+ // Exponent is always expressed in decimal, even for hexadecimal floats.
+ begin += ConsumeDigits<10>(begin, end, kDecimalExponentDigitsMax,
+ &result.literal_exponent, nullptr);
+ if (begin == exponent_digits_begin) {
+ // there were no digits where we expected an exponent. We failed to read
+ // an exponent and should not consume the 'e' after all. Rewind 'begin'.
+ found_exponent = false;
+ begin = exponent_begin;
+ } else {
+ found_exponent = true;
+ if (negative_exponent) {
+ result.literal_exponent = -result.literal_exponent;
+ }
+ }
+ }
+
+ if (!found_exponent && RequireExponent(format_flags)) {
+ // Provided flags required an exponent, but none was found. This results
+ // in a failure to scan.
+ return result;
+ }
+
+ // Success!
+ result.type = strings_internal::FloatType::kNumber;
+ if (result.mantissa > 0) {
+ result.exponent = result.literal_exponent +
+ (DigitMagnitude<base>() * exponent_adjustment);
+ } else {
+ result.exponent = 0;
+ }
+ result.end = begin;
+ return result;
+}
+
+template ParsedFloat ParseFloat<10>(const char* begin, const char* end,
+ chars_format format_flags);
+template ParsedFloat ParseFloat<16>(const char* begin, const char* end,
+ chars_format format_flags);
+
+} // namespace strings_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/strings/internal/charconv_parse.h b/third_party/abseil/src/absl/strings/internal/charconv_parse.h
new file mode 100644
index 0000000..505998b
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/internal/charconv_parse.h
@@ -0,0 +1,99 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_STRINGS_INTERNAL_CHARCONV_PARSE_H_
+#define ABSL_STRINGS_INTERNAL_CHARCONV_PARSE_H_
+
+#include <cstdint>
+
+#include "absl/base/config.h"
+#include "absl/strings/charconv.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace strings_internal {
+
+// Enum indicating whether a parsed float is a number or special value.
+enum class FloatType { kNumber, kInfinity, kNan };
+
+// The decomposed parts of a parsed `float` or `double`.
+struct ParsedFloat {
+ // Representation of the parsed mantissa, with the decimal point adjusted to
+ // make it an integer.
+ //
+ // During decimal scanning, this contains 19 significant digits worth of
+ // mantissa value. If digits beyond this point are found, they
+ // are truncated, and if any of these dropped digits are nonzero, then
+ // `mantissa` is inexact, and the full mantissa is stored in [subrange_begin,
+ // subrange_end).
+ //
+ // During hexadecimal scanning, this contains 15 significant hex digits worth
+ // of mantissa value. Digits beyond this point are sticky -- they are
+ // truncated, but if any dropped digits are nonzero, the low bit of mantissa
+ // will be set. (This allows for precise rounding, and avoids the need
+ // to store the full mantissa in [subrange_begin, subrange_end).)
+ uint64_t mantissa = 0;
+
+ // Floating point expontent. This reflects any decimal point adjustments and
+ // any truncated digits from the mantissa. The absolute value of the parsed
+ // number is represented by mantissa * (base ** exponent), where base==10 for
+ // decimal floats, and base==2 for hexadecimal floats.
+ int exponent = 0;
+
+ // The literal exponent value scanned from the input, or 0 if none was
+ // present. This does not reflect any adjustments applied to mantissa.
+ int literal_exponent = 0;
+
+ // The type of number scanned.
+ FloatType type = FloatType::kNumber;
+
+ // When non-null, [subrange_begin, subrange_end) marks a range of characters
+ // that require further processing. The meaning is dependent on float type.
+ // If type == kNumber and this is set, this is a "wide input": the input
+ // mantissa contained more than 19 digits. The range contains the full
+ // mantissa. It plus `literal_exponent` need to be examined to find the best
+ // floating point match.
+ // If type == kNan and this is set, the range marks the contents of a
+ // matched parenthesized character region after the NaN.
+ const char* subrange_begin = nullptr;
+ const char* subrange_end = nullptr;
+
+ // One-past-the-end of the successfully parsed region, or nullptr if no
+ // matching pattern was found.
+ const char* end = nullptr;
+};
+
+// Read the floating point number in the provided range, and populate
+// ParsedFloat accordingly.
+//
+// format_flags is a bitmask value specifying what patterns this API will match.
+// `scientific` and `fixed` are honored per std::from_chars rules
+// ([utility.from.chars], C++17): if exactly one of these bits is set, then an
+// exponent is required, or dislallowed, respectively.
+//
+// Template parameter `base` must be either 10 or 16. For base 16, a "0x" is
+// *not* consumed. The `hex` bit from format_flags is ignored by ParseFloat.
+template <int base>
+ParsedFloat ParseFloat(const char* begin, const char* end,
+ absl::chars_format format_flags);
+
+extern template ParsedFloat ParseFloat<10>(const char* begin, const char* end,
+ absl::chars_format format_flags);
+extern template ParsedFloat ParseFloat<16>(const char* begin, const char* end,
+ absl::chars_format format_flags);
+
+} // namespace strings_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+#endif // ABSL_STRINGS_INTERNAL_CHARCONV_PARSE_H_
diff --git a/third_party/abseil/src/absl/strings/internal/charconv_parse_test.cc b/third_party/abseil/src/absl/strings/internal/charconv_parse_test.cc
new file mode 100644
index 0000000..bc2d111
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/internal/charconv_parse_test.cc
@@ -0,0 +1,357 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/strings/internal/charconv_parse.h"
+
+#include <string>
+#include <utility>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/base/internal/raw_logging.h"
+#include "absl/strings/str_cat.h"
+
+using absl::chars_format;
+using absl::strings_internal::FloatType;
+using absl::strings_internal::ParsedFloat;
+using absl::strings_internal::ParseFloat;
+
+namespace {
+
+// Check that a given string input is parsed to the expected mantissa and
+// exponent.
+//
+// Input string `s` must contain a '$' character. It marks the end of the
+// characters that should be consumed by the match. It is stripped from the
+// input to ParseFloat.
+//
+// If input string `s` contains '[' and ']' characters, these mark the region
+// of characters that should be marked as the "subrange". For NaNs, this is
+// the location of the extended NaN string. For numbers, this is the location
+// of the full, over-large mantissa.
+template <int base>
+void ExpectParsedFloat(std::string s, absl::chars_format format_flags,
+ FloatType expected_type, uint64_t expected_mantissa,
+ int expected_exponent,
+ int expected_literal_exponent = -999) {
+ SCOPED_TRACE(s);
+
+ int begin_subrange = -1;
+ int end_subrange = -1;
+ // If s contains '[' and ']', then strip these characters and set the subrange
+ // indices appropriately.
+ std::string::size_type open_bracket_pos = s.find('[');
+ if (open_bracket_pos != std::string::npos) {
+ begin_subrange = static_cast<int>(open_bracket_pos);
+ s.replace(open_bracket_pos, 1, "");
+ std::string::size_type close_bracket_pos = s.find(']');
+ ABSL_RAW_CHECK(close_bracket_pos != absl::string_view::npos,
+ "Test input contains [ without matching ]");
+ end_subrange = static_cast<int>(close_bracket_pos);
+ s.replace(close_bracket_pos, 1, "");
+ }
+ const std::string::size_type expected_characters_matched = s.find('$');
+ ABSL_RAW_CHECK(expected_characters_matched != std::string::npos,
+ "Input string must contain $");
+ s.replace(expected_characters_matched, 1, "");
+
+ ParsedFloat parsed =
+ ParseFloat<base>(s.data(), s.data() + s.size(), format_flags);
+
+ EXPECT_NE(parsed.end, nullptr);
+ if (parsed.end == nullptr) {
+ return; // The following tests are not useful if we fully failed to parse
+ }
+ EXPECT_EQ(parsed.type, expected_type);
+ if (begin_subrange == -1) {
+ EXPECT_EQ(parsed.subrange_begin, nullptr);
+ EXPECT_EQ(parsed.subrange_end, nullptr);
+ } else {
+ EXPECT_EQ(parsed.subrange_begin, s.data() + begin_subrange);
+ EXPECT_EQ(parsed.subrange_end, s.data() + end_subrange);
+ }
+ if (parsed.type == FloatType::kNumber) {
+ EXPECT_EQ(parsed.mantissa, expected_mantissa);
+ EXPECT_EQ(parsed.exponent, expected_exponent);
+ if (expected_literal_exponent != -999) {
+ EXPECT_EQ(parsed.literal_exponent, expected_literal_exponent);
+ }
+ }
+ auto characters_matched = static_cast<int>(parsed.end - s.data());
+ EXPECT_EQ(characters_matched, expected_characters_matched);
+}
+
+// Check that a given string input is parsed to the expected mantissa and
+// exponent.
+//
+// Input string `s` must contain a '$' character. It marks the end of the
+// characters that were consumed by the match.
+template <int base>
+void ExpectNumber(std::string s, absl::chars_format format_flags,
+ uint64_t expected_mantissa, int expected_exponent,
+ int expected_literal_exponent = -999) {
+ ExpectParsedFloat<base>(std::move(s), format_flags, FloatType::kNumber,
+ expected_mantissa, expected_exponent,
+ expected_literal_exponent);
+}
+
+// Check that a given string input is parsed to the given special value.
+//
+// This tests against both number bases, since infinities and NaNs have
+// identical representations in both modes.
+void ExpectSpecial(const std::string& s, absl::chars_format format_flags,
+ FloatType type) {
+ ExpectParsedFloat<10>(s, format_flags, type, 0, 0);
+ ExpectParsedFloat<16>(s, format_flags, type, 0, 0);
+}
+
+// Check that a given input string is not matched by Float.
+template <int base>
+void ExpectFailedParse(absl::string_view s, absl::chars_format format_flags) {
+ ParsedFloat parsed =
+ ParseFloat<base>(s.data(), s.data() + s.size(), format_flags);
+ EXPECT_EQ(parsed.end, nullptr);
+}
+
+TEST(ParseFloat, SimpleValue) {
+ // Test that various forms of floating point numbers all parse correctly.
+ ExpectNumber<10>("1.23456789e5$", chars_format::general, 123456789, -3);
+ ExpectNumber<10>("1.23456789e+5$", chars_format::general, 123456789, -3);
+ ExpectNumber<10>("1.23456789E5$", chars_format::general, 123456789, -3);
+ ExpectNumber<10>("1.23456789e05$", chars_format::general, 123456789, -3);
+ ExpectNumber<10>("123.456789e3$", chars_format::general, 123456789, -3);
+ ExpectNumber<10>("0.000123456789e9$", chars_format::general, 123456789, -3);
+ ExpectNumber<10>("123456.789$", chars_format::general, 123456789, -3);
+ ExpectNumber<10>("123456789e-3$", chars_format::general, 123456789, -3);
+
+ ExpectNumber<16>("1.234abcdefp28$", chars_format::general, 0x1234abcdef, -8);
+ ExpectNumber<16>("1.234abcdefp+28$", chars_format::general, 0x1234abcdef, -8);
+ ExpectNumber<16>("1.234ABCDEFp28$", chars_format::general, 0x1234abcdef, -8);
+ ExpectNumber<16>("1.234AbCdEfP0028$", chars_format::general, 0x1234abcdef,
+ -8);
+ ExpectNumber<16>("123.4abcdefp20$", chars_format::general, 0x1234abcdef, -8);
+ ExpectNumber<16>("0.0001234abcdefp44$", chars_format::general, 0x1234abcdef,
+ -8);
+ ExpectNumber<16>("1234abcd.ef$", chars_format::general, 0x1234abcdef, -8);
+ ExpectNumber<16>("1234abcdefp-8$", chars_format::general, 0x1234abcdef, -8);
+
+ // ExpectNumber does not attempt to drop trailing zeroes.
+ ExpectNumber<10>("0001.2345678900e005$", chars_format::general, 12345678900,
+ -5);
+ ExpectNumber<16>("0001.234abcdef000p28$", chars_format::general,
+ 0x1234abcdef000, -20);
+
+ // Ensure non-matching characters after a number are ignored, even when they
+ // look like potentially matching characters.
+ ExpectNumber<10>("1.23456789e5$ ", chars_format::general, 123456789, -3);
+ ExpectNumber<10>("1.23456789e5$e5e5", chars_format::general, 123456789, -3);
+ ExpectNumber<10>("1.23456789e5$.25", chars_format::general, 123456789, -3);
+ ExpectNumber<10>("1.23456789e5$-", chars_format::general, 123456789, -3);
+ ExpectNumber<10>("1.23456789e5$PUPPERS!!!", chars_format::general, 123456789,
+ -3);
+ ExpectNumber<10>("123456.789$efghij", chars_format::general, 123456789, -3);
+ ExpectNumber<10>("123456.789$e", chars_format::general, 123456789, -3);
+ ExpectNumber<10>("123456.789$p5", chars_format::general, 123456789, -3);
+ ExpectNumber<10>("123456.789$.10", chars_format::general, 123456789, -3);
+
+ ExpectNumber<16>("1.234abcdefp28$ ", chars_format::general, 0x1234abcdef,
+ -8);
+ ExpectNumber<16>("1.234abcdefp28$p28", chars_format::general, 0x1234abcdef,
+ -8);
+ ExpectNumber<16>("1.234abcdefp28$.125", chars_format::general, 0x1234abcdef,
+ -8);
+ ExpectNumber<16>("1.234abcdefp28$-", chars_format::general, 0x1234abcdef, -8);
+ ExpectNumber<16>("1.234abcdefp28$KITTEHS!!!", chars_format::general,
+ 0x1234abcdef, -8);
+ ExpectNumber<16>("1234abcd.ef$ghijk", chars_format::general, 0x1234abcdef,
+ -8);
+ ExpectNumber<16>("1234abcd.ef$p", chars_format::general, 0x1234abcdef, -8);
+ ExpectNumber<16>("1234abcd.ef$.10", chars_format::general, 0x1234abcdef, -8);
+
+ // Ensure we can read a full resolution mantissa without overflow.
+ ExpectNumber<10>("9999999999999999999$", chars_format::general,
+ 9999999999999999999u, 0);
+ ExpectNumber<16>("fffffffffffffff$", chars_format::general,
+ 0xfffffffffffffffu, 0);
+
+ // Check that zero is consistently read.
+ ExpectNumber<10>("0$", chars_format::general, 0, 0);
+ ExpectNumber<16>("0$", chars_format::general, 0, 0);
+ ExpectNumber<10>("000000000000000000000000000000000000000$",
+ chars_format::general, 0, 0);
+ ExpectNumber<16>("000000000000000000000000000000000000000$",
+ chars_format::general, 0, 0);
+ ExpectNumber<10>("0000000000000000000000.000000000000000000$",
+ chars_format::general, 0, 0);
+ ExpectNumber<16>("0000000000000000000000.000000000000000000$",
+ chars_format::general, 0, 0);
+ ExpectNumber<10>("0.00000000000000000000000000000000e123456$",
+ chars_format::general, 0, 0);
+ ExpectNumber<16>("0.00000000000000000000000000000000p123456$",
+ chars_format::general, 0, 0);
+}
+
+TEST(ParseFloat, LargeDecimalMantissa) {
+ // After 19 significant decimal digits in the mantissa, ParsedFloat will
+ // truncate additional digits. We need to test that:
+ // 1) the truncation to 19 digits happens
+ // 2) the returned exponent reflects the dropped significant digits
+ // 3) a correct literal_exponent is set
+ //
+ // If and only if a significant digit is found after 19 digits, then the
+ // entirety of the mantissa in case the exact value is needed to make a
+ // rounding decision. The [ and ] characters below denote where such a
+ // subregion was marked by by ParseFloat. They are not part of the input.
+
+ // Mark a capture group only if a dropped digit is significant (nonzero).
+ ExpectNumber<10>("100000000000000000000000000$", chars_format::general,
+ 1000000000000000000,
+ /* adjusted exponent */ 8);
+
+ ExpectNumber<10>("123456789123456789100000000$", chars_format::general,
+ 1234567891234567891,
+ /* adjusted exponent */ 8);
+
+ ExpectNumber<10>("[123456789123456789123456789]$", chars_format::general,
+ 1234567891234567891,
+ /* adjusted exponent */ 8,
+ /* literal exponent */ 0);
+
+ ExpectNumber<10>("[123456789123456789100000009]$", chars_format::general,
+ 1234567891234567891,
+ /* adjusted exponent */ 8,
+ /* literal exponent */ 0);
+
+ ExpectNumber<10>("[123456789123456789120000000]$", chars_format::general,
+ 1234567891234567891,
+ /* adjusted exponent */ 8,
+ /* literal exponent */ 0);
+
+ // Leading zeroes should not count towards the 19 significant digit limit
+ ExpectNumber<10>("[00000000123456789123456789123456789]$",
+ chars_format::general, 1234567891234567891,
+ /* adjusted exponent */ 8,
+ /* literal exponent */ 0);
+
+ ExpectNumber<10>("00000000123456789123456789100000000$",
+ chars_format::general, 1234567891234567891,
+ /* adjusted exponent */ 8);
+
+ // Truncated digits after the decimal point should not cause a further
+ // exponent adjustment.
+ ExpectNumber<10>("1.234567891234567891e123$", chars_format::general,
+ 1234567891234567891, 105);
+ ExpectNumber<10>("[1.23456789123456789123456789]e123$", chars_format::general,
+ 1234567891234567891,
+ /* adjusted exponent */ 105,
+ /* literal exponent */ 123);
+
+ // Ensure we truncate, and not round. (The from_chars algorithm we use
+ // depends on our guess missing low, if it misses, so we need the rounding
+ // error to be downward.)
+ ExpectNumber<10>("[1999999999999999999999]$", chars_format::general,
+ 1999999999999999999,
+ /* adjusted exponent */ 3,
+ /* literal exponent */ 0);
+}
+
+TEST(ParseFloat, LargeHexadecimalMantissa) {
+ // After 15 significant hex digits in the mantissa, ParsedFloat will treat
+ // additional digits as sticky, We need to test that:
+ // 1) The truncation to 15 digits happens
+ // 2) The returned exponent reflects the dropped significant digits
+ // 3) If a nonzero digit is dropped, the low bit of mantissa is set.
+
+ ExpectNumber<16>("123456789abcdef123456789abcdef$", chars_format::general,
+ 0x123456789abcdef, 60);
+
+ // Leading zeroes should not count towards the 15 significant digit limit
+ ExpectNumber<16>("000000123456789abcdef123456789abcdef$",
+ chars_format::general, 0x123456789abcdef, 60);
+
+ // Truncated digits after the radix point should not cause a further
+ // exponent adjustment.
+ ExpectNumber<16>("1.23456789abcdefp100$", chars_format::general,
+ 0x123456789abcdef, 44);
+ ExpectNumber<16>("1.23456789abcdef123456789abcdefp100$",
+ chars_format::general, 0x123456789abcdef, 44);
+
+ // test sticky digit behavior. The low bit should be set iff any dropped
+ // digit is nonzero.
+ ExpectNumber<16>("123456789abcdee123456789abcdee$", chars_format::general,
+ 0x123456789abcdef, 60);
+ ExpectNumber<16>("123456789abcdee000000000000001$", chars_format::general,
+ 0x123456789abcdef, 60);
+ ExpectNumber<16>("123456789abcdee000000000000000$", chars_format::general,
+ 0x123456789abcdee, 60);
+}
+
+TEST(ParseFloat, ScientificVsFixed) {
+ // In fixed mode, an exponent is never matched (but the remainder of the
+ // number will be matched.)
+ ExpectNumber<10>("1.23456789$e5", chars_format::fixed, 123456789, -8);
+ ExpectNumber<10>("123456.789$", chars_format::fixed, 123456789, -3);
+ ExpectNumber<16>("1.234abcdef$p28", chars_format::fixed, 0x1234abcdef, -36);
+ ExpectNumber<16>("1234abcd.ef$", chars_format::fixed, 0x1234abcdef, -8);
+
+ // In scientific mode, numbers don't match *unless* they have an exponent.
+ ExpectNumber<10>("1.23456789e5$", chars_format::scientific, 123456789, -3);
+ ExpectFailedParse<10>("-123456.789$", chars_format::scientific);
+ ExpectNumber<16>("1.234abcdefp28$", chars_format::scientific, 0x1234abcdef,
+ -8);
+ ExpectFailedParse<16>("1234abcd.ef$", chars_format::scientific);
+}
+
+TEST(ParseFloat, Infinity) {
+ ExpectFailedParse<10>("in", chars_format::general);
+ ExpectFailedParse<16>("in", chars_format::general);
+ ExpectFailedParse<10>("inx", chars_format::general);
+ ExpectFailedParse<16>("inx", chars_format::general);
+ ExpectSpecial("inf$", chars_format::general, FloatType::kInfinity);
+ ExpectSpecial("Inf$", chars_format::general, FloatType::kInfinity);
+ ExpectSpecial("INF$", chars_format::general, FloatType::kInfinity);
+ ExpectSpecial("inf$inite", chars_format::general, FloatType::kInfinity);
+ ExpectSpecial("iNfInItY$", chars_format::general, FloatType::kInfinity);
+ ExpectSpecial("infinity$!!!", chars_format::general, FloatType::kInfinity);
+}
+
+TEST(ParseFloat, NaN) {
+ ExpectFailedParse<10>("na", chars_format::general);
+ ExpectFailedParse<16>("na", chars_format::general);
+ ExpectFailedParse<10>("nah", chars_format::general);
+ ExpectFailedParse<16>("nah", chars_format::general);
+ ExpectSpecial("nan$", chars_format::general, FloatType::kNan);
+ ExpectSpecial("NaN$", chars_format::general, FloatType::kNan);
+ ExpectSpecial("nAn$", chars_format::general, FloatType::kNan);
+ ExpectSpecial("NAN$", chars_format::general, FloatType::kNan);
+ ExpectSpecial("NaN$aNaNaNaNaBatman!", chars_format::general, FloatType::kNan);
+
+ // A parenthesized sequence of the characters [a-zA-Z0-9_] is allowed to
+ // appear after an NaN. Check that this is allowed, and that the correct
+ // characters are grouped.
+ //
+ // (The characters [ and ] in the pattern below delimit the expected matched
+ // subgroup; they are not part of the input passed to ParseFloat.)
+ ExpectSpecial("nan([0xabcdef])$", chars_format::general, FloatType::kNan);
+ ExpectSpecial("nan([0xabcdef])$...", chars_format::general, FloatType::kNan);
+ ExpectSpecial("nan([0xabcdef])$)...", chars_format::general, FloatType::kNan);
+ ExpectSpecial("nan([])$", chars_format::general, FloatType::kNan);
+ ExpectSpecial("nan([aAzZ09_])$", chars_format::general, FloatType::kNan);
+ // If the subgroup contains illegal characters, don't match it at all.
+ ExpectSpecial("nan$(bad-char)", chars_format::general, FloatType::kNan);
+ // Also cope with a missing close paren.
+ ExpectSpecial("nan$(0xabcdef", chars_format::general, FloatType::kNan);
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/strings/internal/cord_internal.h b/third_party/abseil/src/absl/strings/internal/cord_internal.h
new file mode 100644
index 0000000..aa91a69
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/internal/cord_internal.h
@@ -0,0 +1,270 @@
+// Copyright 2020 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_STRINGS_INTERNAL_CORD_INTERNAL_H_
+#define ABSL_STRINGS_INTERNAL_CORD_INTERNAL_H_
+
+#include <atomic>
+#include <cassert>
+#include <cstddef>
+#include <cstdint>
+#include <type_traits>
+
+#include "absl/base/internal/invoke.h"
+#include "absl/container/internal/compressed_tuple.h"
+#include "absl/meta/type_traits.h"
+#include "absl/strings/string_view.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace cord_internal {
+
+// Wraps std::atomic for reference counting.
+class Refcount {
+ public:
+ constexpr Refcount() : count_{kRefIncrement} {}
+ struct Immortal {};
+ explicit constexpr Refcount(Immortal) : count_(kImmortalTag) {}
+
+ // Increments the reference count. Imposes no memory ordering.
+ inline void Increment() {
+ count_.fetch_add(kRefIncrement, std::memory_order_relaxed);
+ }
+
+ // Asserts that the current refcount is greater than 0. If the refcount is
+ // greater than 1, decrements the reference count.
+ //
+ // Returns false if there are no references outstanding; true otherwise.
+ // Inserts barriers to ensure that state written before this method returns
+ // false will be visible to a thread that just observed this method returning
+ // false.
+ inline bool Decrement() {
+ int32_t refcount = count_.load(std::memory_order_acquire);
+ assert(refcount > 0 || refcount & kImmortalTag);
+ return refcount != kRefIncrement &&
+ count_.fetch_sub(kRefIncrement, std::memory_order_acq_rel) !=
+ kRefIncrement;
+ }
+
+ // Same as Decrement but expect that refcount is greater than 1.
+ inline bool DecrementExpectHighRefcount() {
+ int32_t refcount =
+ count_.fetch_sub(kRefIncrement, std::memory_order_acq_rel);
+ assert(refcount > 0 || refcount & kImmortalTag);
+ return refcount != kRefIncrement;
+ }
+
+ // Returns the current reference count using acquire semantics.
+ inline int32_t Get() const {
+ return count_.load(std::memory_order_acquire) >> kImmortalShift;
+ }
+
+ // Returns whether the atomic integer is 1.
+ // If the reference count is used in the conventional way, a
+ // reference count of 1 implies that the current thread owns the
+ // reference and no other thread shares it.
+ // This call performs the test for a reference count of one, and
+ // performs the memory barrier needed for the owning thread
+ // to act on the object, knowing that it has exclusive access to the
+ // object.
+ inline bool IsOne() {
+ return count_.load(std::memory_order_acquire) == kRefIncrement;
+ }
+
+ bool IsImmortal() const {
+ return (count_.load(std::memory_order_relaxed) & kImmortalTag) != 0;
+ }
+
+ private:
+ // We reserve the bottom bit to tag a reference count as immortal.
+ // By making it `1` we ensure that we never reach `0` when adding/subtracting
+ // `2`, thus it never looks as if it should be destroyed.
+ // These are used for the StringConstant constructor where we do not increase
+ // the refcount at construction time (due to constinit requirements) but we
+ // will still decrease it at destruction time to avoid branching on Unref.
+ enum {
+ kImmortalShift = 1,
+ kRefIncrement = 1 << kImmortalShift,
+ kImmortalTag = kRefIncrement - 1
+ };
+
+ std::atomic<int32_t> count_;
+};
+
+// The overhead of a vtable is too much for Cord, so we roll our own subclasses
+// using only a single byte to differentiate classes from each other - the "tag"
+// byte. Define the subclasses first so we can provide downcasting helper
+// functions in the base class.
+
+struct CordRepConcat;
+struct CordRepSubstring;
+struct CordRepExternal;
+
+// Various representations that we allow
+enum CordRepKind {
+ CONCAT = 0,
+ EXTERNAL = 1,
+ SUBSTRING = 2,
+
+ // We have different tags for different sized flat arrays,
+ // starting with FLAT
+ FLAT = 3,
+};
+
+struct CordRep {
+ CordRep() = default;
+ constexpr CordRep(Refcount::Immortal immortal, size_t l)
+ : length(l), refcount(immortal), tag(EXTERNAL), data{} {}
+
+ // The following three fields have to be less than 32 bytes since
+ // that is the smallest supported flat node size.
+ size_t length;
+ Refcount refcount;
+ // If tag < FLAT, it represents CordRepKind and indicates the type of node.
+ // Otherwise, the node type is CordRepFlat and the tag is the encoded size.
+ uint8_t tag;
+ char data[1]; // Starting point for flat array: MUST BE LAST FIELD of CordRep
+
+ inline CordRepConcat* concat();
+ inline const CordRepConcat* concat() const;
+ inline CordRepSubstring* substring();
+ inline const CordRepSubstring* substring() const;
+ inline CordRepExternal* external();
+ inline const CordRepExternal* external() const;
+};
+
+struct CordRepConcat : public CordRep {
+ CordRep* left;
+ CordRep* right;
+
+ uint8_t depth() const { return static_cast<uint8_t>(data[0]); }
+ void set_depth(uint8_t depth) { data[0] = static_cast<char>(depth); }
+};
+
+struct CordRepSubstring : public CordRep {
+ size_t start; // Starting offset of substring in child
+ CordRep* child;
+};
+
+// Type for function pointer that will invoke the releaser function and also
+// delete the `CordRepExternalImpl` corresponding to the passed in
+// `CordRepExternal`.
+using ExternalReleaserInvoker = void (*)(CordRepExternal*);
+
+// External CordReps are allocated together with a type erased releaser. The
+// releaser is stored in the memory directly following the CordRepExternal.
+struct CordRepExternal : public CordRep {
+ CordRepExternal() = default;
+ explicit constexpr CordRepExternal(absl::string_view str)
+ : CordRep(Refcount::Immortal{}, str.size()),
+ base(str.data()),
+ releaser_invoker(nullptr) {}
+
+ const char* base;
+ // Pointer to function that knows how to call and destroy the releaser.
+ ExternalReleaserInvoker releaser_invoker;
+};
+
+struct Rank1 {};
+struct Rank0 : Rank1 {};
+
+template <typename Releaser, typename = ::absl::base_internal::invoke_result_t<
+ Releaser, absl::string_view>>
+void InvokeReleaser(Rank0, Releaser&& releaser, absl::string_view data) {
+ ::absl::base_internal::invoke(std::forward<Releaser>(releaser), data);
+}
+
+template <typename Releaser,
+ typename = ::absl::base_internal::invoke_result_t<Releaser>>
+void InvokeReleaser(Rank1, Releaser&& releaser, absl::string_view) {
+ ::absl::base_internal::invoke(std::forward<Releaser>(releaser));
+}
+
+// We use CompressedTuple so that we can benefit from EBCO.
+template <typename Releaser>
+struct CordRepExternalImpl
+ : public CordRepExternal,
+ public ::absl::container_internal::CompressedTuple<Releaser> {
+ // The extra int arg is so that we can avoid interfering with copy/move
+ // constructors while still benefitting from perfect forwarding.
+ template <typename T>
+ CordRepExternalImpl(T&& releaser, int)
+ : CordRepExternalImpl::CompressedTuple(std::forward<T>(releaser)) {
+ this->releaser_invoker = &Release;
+ }
+
+ ~CordRepExternalImpl() {
+ InvokeReleaser(Rank0{}, std::move(this->template get<0>()),
+ absl::string_view(base, length));
+ }
+
+ static void Release(CordRepExternal* rep) {
+ delete static_cast<CordRepExternalImpl*>(rep);
+ }
+};
+
+template <typename Str>
+struct ConstInitExternalStorage {
+ ABSL_CONST_INIT static CordRepExternal value;
+};
+
+template <typename Str>
+CordRepExternal ConstInitExternalStorage<Str>::value(Str::value);
+
+enum {
+ kMaxInline = 15,
+ // Tag byte & kMaxInline means we are storing a pointer.
+ kTreeFlag = 1 << 4,
+ // Tag byte & kProfiledFlag means we are profiling the Cord.
+ kProfiledFlag = 1 << 5
+};
+
+// If the data has length <= kMaxInline, we store it in `as_chars`, and
+// store the size in `tagged_size`.
+// Else we store it in a tree and store a pointer to that tree in
+// `as_tree.rep` and store a tag in `tagged_size`.
+struct AsTree {
+ absl::cord_internal::CordRep* rep;
+ char padding[kMaxInline + 1 - sizeof(absl::cord_internal::CordRep*) - 1];
+ char tagged_size;
+};
+
+constexpr char GetOrNull(absl::string_view data, size_t pos) {
+ return pos < data.size() ? data[pos] : '\0';
+}
+
+union InlineData {
+ constexpr InlineData() : as_chars{} {}
+ explicit constexpr InlineData(AsTree tree) : as_tree(tree) {}
+ explicit constexpr InlineData(absl::string_view chars)
+ : as_chars{GetOrNull(chars, 0), GetOrNull(chars, 1),
+ GetOrNull(chars, 2), GetOrNull(chars, 3),
+ GetOrNull(chars, 4), GetOrNull(chars, 5),
+ GetOrNull(chars, 6), GetOrNull(chars, 7),
+ GetOrNull(chars, 8), GetOrNull(chars, 9),
+ GetOrNull(chars, 10), GetOrNull(chars, 11),
+ GetOrNull(chars, 12), GetOrNull(chars, 13),
+ GetOrNull(chars, 14), static_cast<char>(chars.size())} {}
+
+ AsTree as_tree;
+ char as_chars[kMaxInline + 1];
+};
+static_assert(sizeof(InlineData) == kMaxInline + 1, "");
+static_assert(sizeof(AsTree) == sizeof(InlineData), "");
+static_assert(offsetof(AsTree, tagged_size) == kMaxInline, "");
+
+} // namespace cord_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+#endif // ABSL_STRINGS_INTERNAL_CORD_INTERNAL_H_
diff --git a/third_party/abseil/src/absl/strings/internal/escaping.cc b/third_party/abseil/src/absl/strings/internal/escaping.cc
new file mode 100644
index 0000000..c527128
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/internal/escaping.cc
@@ -0,0 +1,180 @@
+// Copyright 2020 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/strings/internal/escaping.h"
+
+#include "absl/base/internal/endian.h"
+#include "absl/base/internal/raw_logging.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace strings_internal {
+
+const char kBase64Chars[] =
+ "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+
+size_t CalculateBase64EscapedLenInternal(size_t input_len, bool do_padding) {
+ // Base64 encodes three bytes of input at a time. If the input is not
+ // divisible by three, we pad as appropriate.
+ //
+ // (from https://tools.ietf.org/html/rfc3548)
+ // Special processing is performed if fewer than 24 bits are available
+ // at the end of the data being encoded. A full encoding quantum is
+ // always completed at the end of a quantity. When fewer than 24 input
+ // bits are available in an input group, zero bits are added (on the
+ // right) to form an integral number of 6-bit groups. Padding at the
+ // end of the data is performed using the '=' character. Since all base
+ // 64 input is an integral number of octets, only the following cases
+ // can arise:
+
+ // Base64 encodes each three bytes of input into four bytes of output.
+ size_t len = (input_len / 3) * 4;
+
+ if (input_len % 3 == 0) {
+ // (from https://tools.ietf.org/html/rfc3548)
+ // (1) the final quantum of encoding input is an integral multiple of 24
+ // bits; here, the final unit of encoded output will be an integral
+ // multiple of 4 characters with no "=" padding,
+ } else if (input_len % 3 == 1) {
+ // (from https://tools.ietf.org/html/rfc3548)
+ // (2) the final quantum of encoding input is exactly 8 bits; here, the
+ // final unit of encoded output will be two characters followed by two
+ // "=" padding characters, or
+ len += 2;
+ if (do_padding) {
+ len += 2;
+ }
+ } else { // (input_len % 3 == 2)
+ // (from https://tools.ietf.org/html/rfc3548)
+ // (3) the final quantum of encoding input is exactly 16 bits; here, the
+ // final unit of encoded output will be three characters followed by one
+ // "=" padding character.
+ len += 3;
+ if (do_padding) {
+ len += 1;
+ }
+ }
+
+ assert(len >= input_len); // make sure we didn't overflow
+ return len;
+}
+
+size_t Base64EscapeInternal(const unsigned char* src, size_t szsrc, char* dest,
+ size_t szdest, const char* base64,
+ bool do_padding) {
+ static const char kPad64 = '=';
+
+ if (szsrc * 4 > szdest * 3) return 0;
+
+ char* cur_dest = dest;
+ const unsigned char* cur_src = src;
+
+ char* const limit_dest = dest + szdest;
+ const unsigned char* const limit_src = src + szsrc;
+
+ // Three bytes of data encodes to four characters of cyphertext.
+ // So we can pump through three-byte chunks atomically.
+ if (szsrc >= 3) { // "limit_src - 3" is UB if szsrc < 3.
+ while (cur_src < limit_src - 3) { // While we have >= 32 bits.
+ uint32_t in = absl::big_endian::Load32(cur_src) >> 8;
+
+ cur_dest[0] = base64[in >> 18];
+ in &= 0x3FFFF;
+ cur_dest[1] = base64[in >> 12];
+ in &= 0xFFF;
+ cur_dest[2] = base64[in >> 6];
+ in &= 0x3F;
+ cur_dest[3] = base64[in];
+
+ cur_dest += 4;
+ cur_src += 3;
+ }
+ }
+ // To save time, we didn't update szdest or szsrc in the loop. So do it now.
+ szdest = limit_dest - cur_dest;
+ szsrc = limit_src - cur_src;
+
+ /* now deal with the tail (<=3 bytes) */
+ switch (szsrc) {
+ case 0:
+ // Nothing left; nothing more to do.
+ break;
+ case 1: {
+ // One byte left: this encodes to two characters, and (optionally)
+ // two pad characters to round out the four-character cypherblock.
+ if (szdest < 2) return 0;
+ uint32_t in = cur_src[0];
+ cur_dest[0] = base64[in >> 2];
+ in &= 0x3;
+ cur_dest[1] = base64[in << 4];
+ cur_dest += 2;
+ szdest -= 2;
+ if (do_padding) {
+ if (szdest < 2) return 0;
+ cur_dest[0] = kPad64;
+ cur_dest[1] = kPad64;
+ cur_dest += 2;
+ szdest -= 2;
+ }
+ break;
+ }
+ case 2: {
+ // Two bytes left: this encodes to three characters, and (optionally)
+ // one pad character to round out the four-character cypherblock.
+ if (szdest < 3) return 0;
+ uint32_t in = absl::big_endian::Load16(cur_src);
+ cur_dest[0] = base64[in >> 10];
+ in &= 0x3FF;
+ cur_dest[1] = base64[in >> 4];
+ in &= 0x00F;
+ cur_dest[2] = base64[in << 2];
+ cur_dest += 3;
+ szdest -= 3;
+ if (do_padding) {
+ if (szdest < 1) return 0;
+ cur_dest[0] = kPad64;
+ cur_dest += 1;
+ szdest -= 1;
+ }
+ break;
+ }
+ case 3: {
+ // Three bytes left: same as in the big loop above. We can't do this in
+ // the loop because the loop above always reads 4 bytes, and the fourth
+ // byte is past the end of the input.
+ if (szdest < 4) return 0;
+ uint32_t in = (cur_src[0] << 16) + absl::big_endian::Load16(cur_src + 1);
+ cur_dest[0] = base64[in >> 18];
+ in &= 0x3FFFF;
+ cur_dest[1] = base64[in >> 12];
+ in &= 0xFFF;
+ cur_dest[2] = base64[in >> 6];
+ in &= 0x3F;
+ cur_dest[3] = base64[in];
+ cur_dest += 4;
+ szdest -= 4;
+ break;
+ }
+ default:
+ // Should not be reached: blocks of 4 bytes are handled
+ // in the while loop before this switch statement.
+ ABSL_RAW_LOG(FATAL, "Logic problem? szsrc = %zu", szsrc);
+ break;
+ }
+ return (cur_dest - dest);
+}
+
+} // namespace strings_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/strings/internal/escaping.h b/third_party/abseil/src/absl/strings/internal/escaping.h
new file mode 100644
index 0000000..6a9ce60
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/internal/escaping.h
@@ -0,0 +1,58 @@
+// Copyright 2020 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_STRINGS_INTERNAL_ESCAPING_H_
+#define ABSL_STRINGS_INTERNAL_ESCAPING_H_
+
+#include <cassert>
+
+#include "absl/strings/internal/resize_uninitialized.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace strings_internal {
+
+ABSL_CONST_INIT extern const char kBase64Chars[];
+
+// Calculates how long a string will be when it is base64 encoded given its
+// length and whether or not the result should be padded.
+size_t CalculateBase64EscapedLenInternal(size_t input_len, bool do_padding);
+
+// Base64-encodes `src` using the alphabet provided in `base64` and writes the
+// result to `dest`. If `do_padding` is true, `dest` is padded with '=' chars
+// until its length is a multiple of 3. Returns the length of `dest`.
+size_t Base64EscapeInternal(const unsigned char* src, size_t szsrc, char* dest,
+ size_t szdest, const char* base64, bool do_padding);
+
+// Base64-encodes `src` using the alphabet provided in `base64` and writes the
+// result to `dest`. If `do_padding` is true, `dest` is padded with '=' chars
+// until its length is a multiple of 3.
+template <typename String>
+void Base64EscapeInternal(const unsigned char* src, size_t szsrc, String* dest,
+ bool do_padding, const char* base64_chars) {
+ const size_t calc_escaped_size =
+ CalculateBase64EscapedLenInternal(szsrc, do_padding);
+ STLStringResizeUninitialized(dest, calc_escaped_size);
+
+ const size_t escaped_len = Base64EscapeInternal(
+ src, szsrc, &(*dest)[0], dest->size(), base64_chars, do_padding);
+ assert(calc_escaped_size == escaped_len);
+ dest->erase(escaped_len);
+}
+
+} // namespace strings_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_STRINGS_INTERNAL_ESCAPING_H_
diff --git a/third_party/abseil/src/absl/strings/internal/escaping_test_common.h b/third_party/abseil/src/absl/strings/internal/escaping_test_common.h
new file mode 100644
index 0000000..7b18017
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/internal/escaping_test_common.h
@@ -0,0 +1,133 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// This test contains common things needed by both escaping_test.cc and
+// escaping_benchmark.cc.
+
+#ifndef ABSL_STRINGS_INTERNAL_ESCAPING_TEST_COMMON_H_
+#define ABSL_STRINGS_INTERNAL_ESCAPING_TEST_COMMON_H_
+
+#include <array>
+#include "absl/strings/string_view.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace strings_internal {
+
+struct base64_testcase {
+ absl::string_view plaintext;
+ absl::string_view cyphertext;
+};
+
+inline const std::array<base64_testcase, 5>& base64_strings() {
+ static const std::array<base64_testcase, 5> testcase{{
+ // Some google quotes
+ // Cyphertext created with "uuencode (GNU sharutils) 4.6.3"
+ // (Note that we're testing the websafe encoding, though, so if
+ // you add messages, be sure to run "tr -- '+/' '-_'" on the output)
+ { "I was always good at math and science, and I never realized "
+ "that was unusual or somehow undesirable. So one of the things "
+ "I care a lot about is helping to remove that stigma, "
+ "to show girls that you can be feminine, you can like the things "
+ "that girls like, but you can also be really good at technology. "
+ "You can be really good at building things."
+ " - Marissa Meyer, Newsweek, 2010-12-22" "\n",
+
+ "SSB3YXMgYWx3YXlzIGdvb2QgYXQgbWF0aCBhbmQgc2NpZW5jZSwgYW5kIEkg"
+ "bmV2ZXIgcmVhbGl6ZWQgdGhhdCB3YXMgdW51c3VhbCBvciBzb21laG93IHVu"
+ "ZGVzaXJhYmxlLiBTbyBvbmUgb2YgdGhlIHRoaW5ncyBJIGNhcmUgYSBsb3Qg"
+ "YWJvdXQgaXMgaGVscGluZyB0byByZW1vdmUgdGhhdCBzdGlnbWEsIHRvIHNo"
+ "b3cgZ2lybHMgdGhhdCB5b3UgY2FuIGJlIGZlbWluaW5lLCB5b3UgY2FuIGxp"
+ "a2UgdGhlIHRoaW5ncyB0aGF0IGdpcmxzIGxpa2UsIGJ1dCB5b3UgY2FuIGFs"
+ "c28gYmUgcmVhbGx5IGdvb2QgYXQgdGVjaG5vbG9neS4gWW91IGNhbiBiZSBy"
+ "ZWFsbHkgZ29vZCBhdCBidWlsZGluZyB0aGluZ3MuIC0gTWFyaXNzYSBNZXll"
+ "ciwgTmV3c3dlZWssIDIwMTAtMTItMjIK" },
+
+ { "Typical first year for a new cluster: "
+ "~0.5 overheating "
+ "~1 PDU failure "
+ "~1 rack-move "
+ "~1 network rewiring "
+ "~20 rack failures "
+ "~5 racks go wonky "
+ "~8 network maintenances "
+ "~12 router reloads "
+ "~3 router failures "
+ "~dozens of minor 30-second blips for dns "
+ "~1000 individual machine failures "
+ "~thousands of hard drive failures "
+ "slow disks, bad memory, misconfigured machines, flaky machines, etc."
+ " - Jeff Dean, The Joys of Real Hardware" "\n",
+
+ "VHlwaWNhbCBmaXJzdCB5ZWFyIGZvciBhIG5ldyBjbHVzdGVyOiB-MC41IG92"
+ "ZXJoZWF0aW5nIH4xIFBEVSBmYWlsdXJlIH4xIHJhY2stbW92ZSB-MSBuZXR3"
+ "b3JrIHJld2lyaW5nIH4yMCByYWNrIGZhaWx1cmVzIH41IHJhY2tzIGdvIHdv"
+ "bmt5IH44IG5ldHdvcmsgbWFpbnRlbmFuY2VzIH4xMiByb3V0ZXIgcmVsb2Fk"
+ "cyB-MyByb3V0ZXIgZmFpbHVyZXMgfmRvemVucyBvZiBtaW5vciAzMC1zZWNv"
+ "bmQgYmxpcHMgZm9yIGRucyB-MTAwMCBpbmRpdmlkdWFsIG1hY2hpbmUgZmFp"
+ "bHVyZXMgfnRob3VzYW5kcyBvZiBoYXJkIGRyaXZlIGZhaWx1cmVzIHNsb3cg"
+ "ZGlza3MsIGJhZCBtZW1vcnksIG1pc2NvbmZpZ3VyZWQgbWFjaGluZXMsIGZs"
+ "YWt5IG1hY2hpbmVzLCBldGMuIC0gSmVmZiBEZWFuLCBUaGUgSm95cyBvZiBS"
+ "ZWFsIEhhcmR3YXJlCg" },
+
+ { "I'm the head of the webspam team at Google. "
+ "That means that if you type your name into Google and get porn back, "
+ "it's my fault. Unless you're a porn star, in which case porn is a "
+ "completely reasonable response."
+ " - Matt Cutts, Google Plus" "\n",
+
+ "SSdtIHRoZSBoZWFkIG9mIHRoZSB3ZWJzcGFtIHRlYW0gYXQgR29vZ2xlLiAg"
+ "VGhhdCBtZWFucyB0aGF0IGlmIHlvdSB0eXBlIHlvdXIgbmFtZSBpbnRvIEdv"
+ "b2dsZSBhbmQgZ2V0IHBvcm4gYmFjaywgaXQncyBteSBmYXVsdC4gVW5sZXNz"
+ "IHlvdSdyZSBhIHBvcm4gc3RhciwgaW4gd2hpY2ggY2FzZSBwb3JuIGlzIGEg"
+ "Y29tcGxldGVseSByZWFzb25hYmxlIHJlc3BvbnNlLiAtIE1hdHQgQ3V0dHMs"
+ "IEdvb2dsZSBQbHVzCg" },
+
+ { "It will still be a long time before machines approach human "
+ "intelligence. "
+ "But luckily, machines don't actually have to be intelligent; "
+ "they just have to fake it. Access to a wealth of information, "
+ "combined with a rudimentary decision-making capacity, "
+ "can often be almost as useful. Of course, the results are better yet "
+ "when coupled with intelligence. A reference librarian with access to "
+ "a good search engine is a formidable tool."
+ " - Craig Silverstein, Siemens Pictures of the Future, Spring 2004"
+ "\n",
+
+ "SXQgd2lsbCBzdGlsbCBiZSBhIGxvbmcgdGltZSBiZWZvcmUgbWFjaGluZXMg"
+ "YXBwcm9hY2ggaHVtYW4gaW50ZWxsaWdlbmNlLiBCdXQgbHVja2lseSwgbWFj"
+ "aGluZXMgZG9uJ3QgYWN0dWFsbHkgaGF2ZSB0byBiZSBpbnRlbGxpZ2VudDsg"
+ "dGhleSBqdXN0IGhhdmUgdG8gZmFrZSBpdC4gQWNjZXNzIHRvIGEgd2VhbHRo"
+ "IG9mIGluZm9ybWF0aW9uLCBjb21iaW5lZCB3aXRoIGEgcnVkaW1lbnRhcnkg"
+ "ZGVjaXNpb24tbWFraW5nIGNhcGFjaXR5LCBjYW4gb2Z0ZW4gYmUgYWxtb3N0"
+ "IGFzIHVzZWZ1bC4gT2YgY291cnNlLCB0aGUgcmVzdWx0cyBhcmUgYmV0dGVy"
+ "IHlldCB3aGVuIGNvdXBsZWQgd2l0aCBpbnRlbGxpZ2VuY2UuIEEgcmVmZXJl"
+ "bmNlIGxpYnJhcmlhbiB3aXRoIGFjY2VzcyB0byBhIGdvb2Qgc2VhcmNoIGVu"
+ "Z2luZSBpcyBhIGZvcm1pZGFibGUgdG9vbC4gLSBDcmFpZyBTaWx2ZXJzdGVp"
+ "biwgU2llbWVucyBQaWN0dXJlcyBvZiB0aGUgRnV0dXJlLCBTcHJpbmcgMjAw"
+ "NAo" },
+
+ // Degenerate edge case
+ { "",
+ "" },
+ }};
+
+ return testcase;
+}
+
+} // namespace strings_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_STRINGS_INTERNAL_ESCAPING_TEST_COMMON_H_
diff --git a/third_party/abseil/src/absl/strings/internal/memutil.cc b/third_party/abseil/src/absl/strings/internal/memutil.cc
new file mode 100644
index 0000000..2519c68
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/internal/memutil.cc
@@ -0,0 +1,112 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/strings/internal/memutil.h"
+
+#include <cstdlib>
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace strings_internal {
+
+int memcasecmp(const char* s1, const char* s2, size_t len) {
+ const unsigned char* us1 = reinterpret_cast<const unsigned char*>(s1);
+ const unsigned char* us2 = reinterpret_cast<const unsigned char*>(s2);
+
+ for (size_t i = 0; i < len; i++) {
+ const int diff =
+ int{static_cast<unsigned char>(absl::ascii_tolower(us1[i]))} -
+ int{static_cast<unsigned char>(absl::ascii_tolower(us2[i]))};
+ if (diff != 0) return diff;
+ }
+ return 0;
+}
+
+char* memdup(const char* s, size_t slen) {
+ void* copy;
+ if ((copy = malloc(slen)) == nullptr) return nullptr;
+ memcpy(copy, s, slen);
+ return reinterpret_cast<char*>(copy);
+}
+
+char* memrchr(const char* s, int c, size_t slen) {
+ for (const char* e = s + slen - 1; e >= s; e--) {
+ if (*e == c) return const_cast<char*>(e);
+ }
+ return nullptr;
+}
+
+size_t memspn(const char* s, size_t slen, const char* accept) {
+ const char* p = s;
+ const char* spanp;
+ char c, sc;
+
+cont:
+ c = *p++;
+ if (slen-- == 0) return p - 1 - s;
+ for (spanp = accept; (sc = *spanp++) != '\0';)
+ if (sc == c) goto cont;
+ return p - 1 - s;
+}
+
+size_t memcspn(const char* s, size_t slen, const char* reject) {
+ const char* p = s;
+ const char* spanp;
+ char c, sc;
+
+ while (slen-- != 0) {
+ c = *p++;
+ for (spanp = reject; (sc = *spanp++) != '\0';)
+ if (sc == c) return p - 1 - s;
+ }
+ return p - s;
+}
+
+char* mempbrk(const char* s, size_t slen, const char* accept) {
+ const char* scanp;
+ int sc;
+
+ for (; slen; ++s, --slen) {
+ for (scanp = accept; (sc = *scanp++) != '\0';)
+ if (sc == *s) return const_cast<char*>(s);
+ }
+ return nullptr;
+}
+
+// This is significantly faster for case-sensitive matches with very
+// few possible matches. See unit test for benchmarks.
+const char* memmatch(const char* phaystack, size_t haylen, const char* pneedle,
+ size_t neelen) {
+ if (0 == neelen) {
+ return phaystack; // even if haylen is 0
+ }
+ if (haylen < neelen) return nullptr;
+
+ const char* match;
+ const char* hayend = phaystack + haylen - neelen + 1;
+ // A static cast is used here to work around the fact that memchr returns
+ // a void* on Posix-compliant systems and const void* on Windows.
+ while ((match = static_cast<const char*>(
+ memchr(phaystack, pneedle[0], hayend - phaystack)))) {
+ if (memcmp(match, pneedle, neelen) == 0)
+ return match;
+ else
+ phaystack = match + 1;
+ }
+ return nullptr;
+}
+
+} // namespace strings_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/strings/internal/memutil.h b/third_party/abseil/src/absl/strings/internal/memutil.h
new file mode 100644
index 0000000..9ad0535
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/internal/memutil.h
@@ -0,0 +1,148 @@
+//
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+// These routines provide mem versions of standard C string routines,
+// such as strpbrk. They function exactly the same as the str versions,
+// so if you wonder what they are, replace the word "mem" by
+// "str" and check out the man page. I could return void*, as the
+// strutil.h mem*() routines tend to do, but I return char* instead
+// since this is by far the most common way these functions are called.
+//
+// The difference between the mem and str versions is the mem version
+// takes a pointer and a length, rather than a '\0'-terminated string.
+// The memcase* routines defined here assume the locale is "C"
+// (they use absl::ascii_tolower instead of tolower).
+//
+// These routines are based on the BSD library.
+//
+// Here's a list of routines from string.h, and their mem analogues.
+// Functions in lowercase are defined in string.h; those in UPPERCASE
+// are defined here:
+//
+// strlen --
+// strcat strncat MEMCAT
+// strcpy strncpy memcpy
+// -- memccpy (very cool function, btw)
+// -- memmove
+// -- memset
+// strcmp strncmp memcmp
+// strcasecmp strncasecmp MEMCASECMP
+// strchr memchr
+// strcoll --
+// strxfrm --
+// strdup strndup MEMDUP
+// strrchr MEMRCHR
+// strspn MEMSPN
+// strcspn MEMCSPN
+// strpbrk MEMPBRK
+// strstr MEMSTR MEMMEM
+// (g)strcasestr MEMCASESTR MEMCASEMEM
+// strtok --
+// strprefix MEMPREFIX (strprefix is from strutil.h)
+// strcaseprefix MEMCASEPREFIX (strcaseprefix is from strutil.h)
+// strsuffix MEMSUFFIX (strsuffix is from strutil.h)
+// strcasesuffix MEMCASESUFFIX (strcasesuffix is from strutil.h)
+// -- MEMIS
+// -- MEMCASEIS
+// strcount MEMCOUNT (strcount is from strutil.h)
+
+#ifndef ABSL_STRINGS_INTERNAL_MEMUTIL_H_
+#define ABSL_STRINGS_INTERNAL_MEMUTIL_H_
+
+#include <cstddef>
+#include <cstring>
+
+#include "absl/base/port.h" // disable some warnings on Windows
+#include "absl/strings/ascii.h" // for absl::ascii_tolower
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace strings_internal {
+
+inline char* memcat(char* dest, size_t destlen, const char* src,
+ size_t srclen) {
+ return reinterpret_cast<char*>(memcpy(dest + destlen, src, srclen));
+}
+
+int memcasecmp(const char* s1, const char* s2, size_t len);
+char* memdup(const char* s, size_t slen);
+char* memrchr(const char* s, int c, size_t slen);
+size_t memspn(const char* s, size_t slen, const char* accept);
+size_t memcspn(const char* s, size_t slen, const char* reject);
+char* mempbrk(const char* s, size_t slen, const char* accept);
+
+// This is for internal use only. Don't call this directly
+template <bool case_sensitive>
+const char* int_memmatch(const char* haystack, size_t haylen,
+ const char* needle, size_t neelen) {
+ if (0 == neelen) {
+ return haystack; // even if haylen is 0
+ }
+ const char* hayend = haystack + haylen;
+ const char* needlestart = needle;
+ const char* needleend = needlestart + neelen;
+
+ for (; haystack < hayend; ++haystack) {
+ char hay = case_sensitive
+ ? *haystack
+ : absl::ascii_tolower(static_cast<unsigned char>(*haystack));
+ char nee = case_sensitive
+ ? *needle
+ : absl::ascii_tolower(static_cast<unsigned char>(*needle));
+ if (hay == nee) {
+ if (++needle == needleend) {
+ return haystack + 1 - neelen;
+ }
+ } else if (needle != needlestart) {
+ // must back up haystack in case a prefix matched (find "aab" in "aaab")
+ haystack -= needle - needlestart; // for loop will advance one more
+ needle = needlestart;
+ }
+ }
+ return nullptr;
+}
+
+// These are the guys you can call directly
+inline const char* memstr(const char* phaystack, size_t haylen,
+ const char* pneedle) {
+ return int_memmatch<true>(phaystack, haylen, pneedle, strlen(pneedle));
+}
+
+inline const char* memcasestr(const char* phaystack, size_t haylen,
+ const char* pneedle) {
+ return int_memmatch<false>(phaystack, haylen, pneedle, strlen(pneedle));
+}
+
+inline const char* memmem(const char* phaystack, size_t haylen,
+ const char* pneedle, size_t needlelen) {
+ return int_memmatch<true>(phaystack, haylen, pneedle, needlelen);
+}
+
+inline const char* memcasemem(const char* phaystack, size_t haylen,
+ const char* pneedle, size_t needlelen) {
+ return int_memmatch<false>(phaystack, haylen, pneedle, needlelen);
+}
+
+// This is significantly faster for case-sensitive matches with very
+// few possible matches. See unit test for benchmarks.
+const char* memmatch(const char* phaystack, size_t haylen, const char* pneedle,
+ size_t neelen);
+
+} // namespace strings_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_STRINGS_INTERNAL_MEMUTIL_H_
diff --git a/third_party/abseil/src/absl/strings/internal/memutil_benchmark.cc b/third_party/abseil/src/absl/strings/internal/memutil_benchmark.cc
new file mode 100644
index 0000000..dc95c3e
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/internal/memutil_benchmark.cc
@@ -0,0 +1,323 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/strings/internal/memutil.h"
+
+#include <algorithm>
+#include <cstdlib>
+
+#include "benchmark/benchmark.h"
+#include "absl/strings/ascii.h"
+
+// We fill the haystack with aaaaaaaaaaaaaaaaaa...aaaab.
+// That gives us:
+// - an easy search: 'b'
+// - a medium search: 'ab'. That means every letter is a possible match.
+// - a pathological search: 'aaaaaa.......aaaaab' (half as many a's as haytack)
+// We benchmark case-sensitive and case-insensitive versions of
+// three memmem implementations:
+// - memmem() from memutil.h
+// - search() from STL
+// - memmatch(), a custom implementation using memchr and memcmp.
+// Here are sample results:
+//
+// Run on (12 X 3800 MHz CPU s)
+// CPU Caches:
+// L1 Data 32K (x6)
+// L1 Instruction 32K (x6)
+// L2 Unified 256K (x6)
+// L3 Unified 15360K (x1)
+// ----------------------------------------------------------------
+// Benchmark Time CPU Iterations
+// ----------------------------------------------------------------
+// BM_Memmem 3583 ns 3582 ns 196469 2.59966GB/s
+// BM_MemmemMedium 13743 ns 13742 ns 50901 693.986MB/s
+// BM_MemmemPathological 13695030 ns 13693977 ns 51 713.133kB/s
+// BM_Memcasemem 3299 ns 3299 ns 212942 2.82309GB/s
+// BM_MemcasememMedium 16407 ns 16406 ns 42170 581.309MB/s
+// BM_MemcasememPathological 17267745 ns 17266030 ns 41 565.598kB/s
+// BM_Search 1610 ns 1609 ns 431321 5.78672GB/s
+// BM_SearchMedium 11111 ns 11110 ns 63001 858.414MB/s
+// BM_SearchPathological 12117390 ns 12116397 ns 58 805.984kB/s
+// BM_Searchcase 3081 ns 3081 ns 229949 3.02313GB/s
+// BM_SearchcaseMedium 16003 ns 16001 ns 44170 595.998MB/s
+// BM_SearchcasePathological 15823413 ns 15821909 ns 44 617.222kB/s
+// BM_Memmatch 197 ns 197 ns 3584225 47.2951GB/s
+// BM_MemmatchMedium 52333 ns 52329 ns 13280 182.244MB/s
+// BM_MemmatchPathological 659799 ns 659727 ns 1058 14.4556MB/s
+// BM_Memcasematch 5460 ns 5460 ns 127606 1.70586GB/s
+// BM_MemcasematchMedium 32861 ns 32857 ns 21258 290.248MB/s
+// BM_MemcasematchPathological 15154243 ns 15153089 ns 46 644.464kB/s
+// BM_MemmemStartup 5 ns 5 ns 150821500
+// BM_SearchStartup 5 ns 5 ns 150644203
+// BM_MemmatchStartup 7 ns 7 ns 97068802
+//
+// Conclusions:
+//
+// The following recommendations are based on the sample results above. However,
+// we have found that the performance of STL search can vary significantly
+// depending on compiler and standard library implementation. We recommend you
+// run the benchmarks for yourself on relevant platforms.
+//
+// If you need case-insensitive, STL search is slightly better than memmem for
+// all cases.
+//
+// Case-sensitive is more subtle:
+// Custom memmatch is _very_ fast at scanning, so if you have very few possible
+// matches in your haystack, that's the way to go. Performance drops
+// significantly with more matches.
+//
+// STL search is slightly faster than memmem in the medium and pathological
+// benchmarks. However, the performance of memmem is currently more dependable
+// across platforms and build configurations.
+
+namespace {
+
+constexpr int kHaystackSize = 10000;
+constexpr int64_t kHaystackSize64 = kHaystackSize;
+const char* MakeHaystack() {
+ char* haystack = new char[kHaystackSize];
+ for (int i = 0; i < kHaystackSize - 1; ++i) haystack[i] = 'a';
+ haystack[kHaystackSize - 1] = 'b';
+ return haystack;
+}
+const char* const kHaystack = MakeHaystack();
+
+void BM_Memmem(benchmark::State& state) {
+ for (auto _ : state) {
+ benchmark::DoNotOptimize(
+ absl::strings_internal::memmem(kHaystack, kHaystackSize, "b", 1));
+ }
+ state.SetBytesProcessed(kHaystackSize64 * state.iterations());
+}
+BENCHMARK(BM_Memmem);
+
+void BM_MemmemMedium(benchmark::State& state) {
+ for (auto _ : state) {
+ benchmark::DoNotOptimize(
+ absl::strings_internal::memmem(kHaystack, kHaystackSize, "ab", 2));
+ }
+ state.SetBytesProcessed(kHaystackSize64 * state.iterations());
+}
+BENCHMARK(BM_MemmemMedium);
+
+void BM_MemmemPathological(benchmark::State& state) {
+ for (auto _ : state) {
+ benchmark::DoNotOptimize(absl::strings_internal::memmem(
+ kHaystack, kHaystackSize, kHaystack + kHaystackSize / 2,
+ kHaystackSize - kHaystackSize / 2));
+ }
+ state.SetBytesProcessed(kHaystackSize64 * state.iterations());
+}
+BENCHMARK(BM_MemmemPathological);
+
+void BM_Memcasemem(benchmark::State& state) {
+ for (auto _ : state) {
+ benchmark::DoNotOptimize(
+ absl::strings_internal::memcasemem(kHaystack, kHaystackSize, "b", 1));
+ }
+ state.SetBytesProcessed(kHaystackSize64 * state.iterations());
+}
+BENCHMARK(BM_Memcasemem);
+
+void BM_MemcasememMedium(benchmark::State& state) {
+ for (auto _ : state) {
+ benchmark::DoNotOptimize(
+ absl::strings_internal::memcasemem(kHaystack, kHaystackSize, "ab", 2));
+ }
+ state.SetBytesProcessed(kHaystackSize64 * state.iterations());
+}
+BENCHMARK(BM_MemcasememMedium);
+
+void BM_MemcasememPathological(benchmark::State& state) {
+ for (auto _ : state) {
+ benchmark::DoNotOptimize(absl::strings_internal::memcasemem(
+ kHaystack, kHaystackSize, kHaystack + kHaystackSize / 2,
+ kHaystackSize - kHaystackSize / 2));
+ }
+ state.SetBytesProcessed(kHaystackSize64 * state.iterations());
+}
+BENCHMARK(BM_MemcasememPathological);
+
+bool case_eq(const char a, const char b) {
+ return absl::ascii_tolower(a) == absl::ascii_tolower(b);
+}
+
+void BM_Search(benchmark::State& state) {
+ for (auto _ : state) {
+ benchmark::DoNotOptimize(std::search(kHaystack, kHaystack + kHaystackSize,
+ kHaystack + kHaystackSize - 1,
+ kHaystack + kHaystackSize));
+ }
+ state.SetBytesProcessed(kHaystackSize64 * state.iterations());
+}
+BENCHMARK(BM_Search);
+
+void BM_SearchMedium(benchmark::State& state) {
+ for (auto _ : state) {
+ benchmark::DoNotOptimize(std::search(kHaystack, kHaystack + kHaystackSize,
+ kHaystack + kHaystackSize - 2,
+ kHaystack + kHaystackSize));
+ }
+ state.SetBytesProcessed(kHaystackSize64 * state.iterations());
+}
+BENCHMARK(BM_SearchMedium);
+
+void BM_SearchPathological(benchmark::State& state) {
+ for (auto _ : state) {
+ benchmark::DoNotOptimize(std::search(kHaystack, kHaystack + kHaystackSize,
+ kHaystack + kHaystackSize / 2,
+ kHaystack + kHaystackSize));
+ }
+ state.SetBytesProcessed(kHaystackSize64 * state.iterations());
+}
+BENCHMARK(BM_SearchPathological);
+
+void BM_Searchcase(benchmark::State& state) {
+ for (auto _ : state) {
+ benchmark::DoNotOptimize(std::search(kHaystack, kHaystack + kHaystackSize,
+ kHaystack + kHaystackSize - 1,
+ kHaystack + kHaystackSize, case_eq));
+ }
+ state.SetBytesProcessed(kHaystackSize64 * state.iterations());
+}
+BENCHMARK(BM_Searchcase);
+
+void BM_SearchcaseMedium(benchmark::State& state) {
+ for (auto _ : state) {
+ benchmark::DoNotOptimize(std::search(kHaystack, kHaystack + kHaystackSize,
+ kHaystack + kHaystackSize - 2,
+ kHaystack + kHaystackSize, case_eq));
+ }
+ state.SetBytesProcessed(kHaystackSize64 * state.iterations());
+}
+BENCHMARK(BM_SearchcaseMedium);
+
+void BM_SearchcasePathological(benchmark::State& state) {
+ for (auto _ : state) {
+ benchmark::DoNotOptimize(std::search(kHaystack, kHaystack + kHaystackSize,
+ kHaystack + kHaystackSize / 2,
+ kHaystack + kHaystackSize, case_eq));
+ }
+ state.SetBytesProcessed(kHaystackSize64 * state.iterations());
+}
+BENCHMARK(BM_SearchcasePathological);
+
+char* memcasechr(const char* s, int c, size_t slen) {
+ c = absl::ascii_tolower(c);
+ for (; slen; ++s, --slen) {
+ if (absl::ascii_tolower(*s) == c) return const_cast<char*>(s);
+ }
+ return nullptr;
+}
+
+const char* memcasematch(const char* phaystack, size_t haylen,
+ const char* pneedle, size_t neelen) {
+ if (0 == neelen) {
+ return phaystack; // even if haylen is 0
+ }
+ if (haylen < neelen) return nullptr;
+
+ const char* match;
+ const char* hayend = phaystack + haylen - neelen + 1;
+ while ((match = static_cast<char*>(
+ memcasechr(phaystack, pneedle[0], hayend - phaystack)))) {
+ if (absl::strings_internal::memcasecmp(match, pneedle, neelen) == 0)
+ return match;
+ else
+ phaystack = match + 1;
+ }
+ return nullptr;
+}
+
+void BM_Memmatch(benchmark::State& state) {
+ for (auto _ : state) {
+ benchmark::DoNotOptimize(
+ absl::strings_internal::memmatch(kHaystack, kHaystackSize, "b", 1));
+ }
+ state.SetBytesProcessed(kHaystackSize64 * state.iterations());
+}
+BENCHMARK(BM_Memmatch);
+
+void BM_MemmatchMedium(benchmark::State& state) {
+ for (auto _ : state) {
+ benchmark::DoNotOptimize(
+ absl::strings_internal::memmatch(kHaystack, kHaystackSize, "ab", 2));
+ }
+ state.SetBytesProcessed(kHaystackSize64 * state.iterations());
+}
+BENCHMARK(BM_MemmatchMedium);
+
+void BM_MemmatchPathological(benchmark::State& state) {
+ for (auto _ : state) {
+ benchmark::DoNotOptimize(absl::strings_internal::memmatch(
+ kHaystack, kHaystackSize, kHaystack + kHaystackSize / 2,
+ kHaystackSize - kHaystackSize / 2));
+ }
+ state.SetBytesProcessed(kHaystackSize64 * state.iterations());
+}
+BENCHMARK(BM_MemmatchPathological);
+
+void BM_Memcasematch(benchmark::State& state) {
+ for (auto _ : state) {
+ benchmark::DoNotOptimize(memcasematch(kHaystack, kHaystackSize, "b", 1));
+ }
+ state.SetBytesProcessed(kHaystackSize64 * state.iterations());
+}
+BENCHMARK(BM_Memcasematch);
+
+void BM_MemcasematchMedium(benchmark::State& state) {
+ for (auto _ : state) {
+ benchmark::DoNotOptimize(memcasematch(kHaystack, kHaystackSize, "ab", 2));
+ }
+ state.SetBytesProcessed(kHaystackSize64 * state.iterations());
+}
+BENCHMARK(BM_MemcasematchMedium);
+
+void BM_MemcasematchPathological(benchmark::State& state) {
+ for (auto _ : state) {
+ benchmark::DoNotOptimize(memcasematch(kHaystack, kHaystackSize,
+ kHaystack + kHaystackSize / 2,
+ kHaystackSize - kHaystackSize / 2));
+ }
+ state.SetBytesProcessed(kHaystackSize64 * state.iterations());
+}
+BENCHMARK(BM_MemcasematchPathological);
+
+void BM_MemmemStartup(benchmark::State& state) {
+ for (auto _ : state) {
+ benchmark::DoNotOptimize(absl::strings_internal::memmem(
+ kHaystack + kHaystackSize - 10, 10, kHaystack + kHaystackSize - 1, 1));
+ }
+}
+BENCHMARK(BM_MemmemStartup);
+
+void BM_SearchStartup(benchmark::State& state) {
+ for (auto _ : state) {
+ benchmark::DoNotOptimize(
+ std::search(kHaystack + kHaystackSize - 10, kHaystack + kHaystackSize,
+ kHaystack + kHaystackSize - 1, kHaystack + kHaystackSize));
+ }
+}
+BENCHMARK(BM_SearchStartup);
+
+void BM_MemmatchStartup(benchmark::State& state) {
+ for (auto _ : state) {
+ benchmark::DoNotOptimize(absl::strings_internal::memmatch(
+ kHaystack + kHaystackSize - 10, 10, kHaystack + kHaystackSize - 1, 1));
+ }
+}
+BENCHMARK(BM_MemmatchStartup);
+
+} // namespace
diff --git a/third_party/abseil/src/absl/strings/internal/memutil_test.cc b/third_party/abseil/src/absl/strings/internal/memutil_test.cc
new file mode 100644
index 0000000..d8681dd
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/internal/memutil_test.cc
@@ -0,0 +1,179 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Unit test for memutil.cc
+
+#include "absl/strings/internal/memutil.h"
+
+#include <cstdlib>
+
+#include "gtest/gtest.h"
+#include "absl/strings/ascii.h"
+
+namespace {
+
+static char* memcasechr(const char* s, int c, size_t slen) {
+ c = absl::ascii_tolower(c);
+ for (; slen; ++s, --slen) {
+ if (absl::ascii_tolower(*s) == c) return const_cast<char*>(s);
+ }
+ return nullptr;
+}
+
+static const char* memcasematch(const char* phaystack, size_t haylen,
+ const char* pneedle, size_t neelen) {
+ if (0 == neelen) {
+ return phaystack; // even if haylen is 0
+ }
+ if (haylen < neelen) return nullptr;
+
+ const char* match;
+ const char* hayend = phaystack + haylen - neelen + 1;
+ while ((match = static_cast<char*>(
+ memcasechr(phaystack, pneedle[0], hayend - phaystack)))) {
+ if (absl::strings_internal::memcasecmp(match, pneedle, neelen) == 0)
+ return match;
+ else
+ phaystack = match + 1;
+ }
+ return nullptr;
+}
+
+TEST(MemUtilTest, AllTests) {
+ // check memutil functions
+ char a[1000];
+ absl::strings_internal::memcat(a, 0, "hello", sizeof("hello") - 1);
+ absl::strings_internal::memcat(a, 5, " there", sizeof(" there") - 1);
+
+ EXPECT_EQ(absl::strings_internal::memcasecmp(a, "heLLO there",
+ sizeof("hello there") - 1),
+ 0);
+ EXPECT_EQ(absl::strings_internal::memcasecmp(a, "heLLO therf",
+ sizeof("hello there") - 1),
+ -1);
+ EXPECT_EQ(absl::strings_internal::memcasecmp(a, "heLLO therf",
+ sizeof("hello there") - 2),
+ 0);
+ EXPECT_EQ(absl::strings_internal::memcasecmp(a, "whatever", 0), 0);
+
+ char* p = absl::strings_internal::memdup("hello", 5);
+ free(p);
+
+ p = absl::strings_internal::memrchr("hello there", 'e',
+ sizeof("hello there") - 1);
+ EXPECT_TRUE(p && p[-1] == 'r');
+ p = absl::strings_internal::memrchr("hello there", 'e',
+ sizeof("hello there") - 2);
+ EXPECT_TRUE(p && p[-1] == 'h');
+ p = absl::strings_internal::memrchr("hello there", 'u',
+ sizeof("hello there") - 1);
+ EXPECT_TRUE(p == nullptr);
+
+ int len = absl::strings_internal::memspn("hello there",
+ sizeof("hello there") - 1, "hole");
+ EXPECT_EQ(len, sizeof("hello") - 1);
+ len = absl::strings_internal::memspn("hello there", sizeof("hello there") - 1,
+ "u");
+ EXPECT_EQ(len, 0);
+ len = absl::strings_internal::memspn("hello there", sizeof("hello there") - 1,
+ "");
+ EXPECT_EQ(len, 0);
+ len = absl::strings_internal::memspn("hello there", sizeof("hello there") - 1,
+ "trole h");
+ EXPECT_EQ(len, sizeof("hello there") - 1);
+ len = absl::strings_internal::memspn("hello there!",
+ sizeof("hello there!") - 1, "trole h");
+ EXPECT_EQ(len, sizeof("hello there") - 1);
+ len = absl::strings_internal::memspn("hello there!",
+ sizeof("hello there!") - 2, "trole h!");
+ EXPECT_EQ(len, sizeof("hello there!") - 2);
+
+ len = absl::strings_internal::memcspn("hello there",
+ sizeof("hello there") - 1, "leho");
+ EXPECT_EQ(len, 0);
+ len = absl::strings_internal::memcspn("hello there",
+ sizeof("hello there") - 1, "u");
+ EXPECT_EQ(len, sizeof("hello there") - 1);
+ len = absl::strings_internal::memcspn("hello there",
+ sizeof("hello there") - 1, "");
+ EXPECT_EQ(len, sizeof("hello there") - 1);
+ len = absl::strings_internal::memcspn("hello there",
+ sizeof("hello there") - 1, " ");
+ EXPECT_EQ(len, 5);
+
+ p = absl::strings_internal::mempbrk("hello there", sizeof("hello there") - 1,
+ "leho");
+ EXPECT_TRUE(p && p[1] == 'e' && p[2] == 'l');
+ p = absl::strings_internal::mempbrk("hello there", sizeof("hello there") - 1,
+ "nu");
+ EXPECT_TRUE(p == nullptr);
+ p = absl::strings_internal::mempbrk("hello there!",
+ sizeof("hello there!") - 2, "!");
+ EXPECT_TRUE(p == nullptr);
+ p = absl::strings_internal::mempbrk("hello there", sizeof("hello there") - 1,
+ " t ");
+ EXPECT_TRUE(p && p[-1] == 'o' && p[1] == 't');
+
+ {
+ const char kHaystack[] = "0123456789";
+ EXPECT_EQ(absl::strings_internal::memmem(kHaystack, 0, "", 0), kHaystack);
+ EXPECT_EQ(absl::strings_internal::memmem(kHaystack, 10, "012", 3),
+ kHaystack);
+ EXPECT_EQ(absl::strings_internal::memmem(kHaystack, 10, "0xx", 1),
+ kHaystack);
+ EXPECT_EQ(absl::strings_internal::memmem(kHaystack, 10, "789", 3),
+ kHaystack + 7);
+ EXPECT_EQ(absl::strings_internal::memmem(kHaystack, 10, "9xx", 1),
+ kHaystack + 9);
+ EXPECT_TRUE(absl::strings_internal::memmem(kHaystack, 10, "9xx", 3) ==
+ nullptr);
+ EXPECT_TRUE(absl::strings_internal::memmem(kHaystack, 10, "xxx", 1) ==
+ nullptr);
+ }
+ {
+ const char kHaystack[] = "aBcDeFgHiJ";
+ EXPECT_EQ(absl::strings_internal::memcasemem(kHaystack, 0, "", 0),
+ kHaystack);
+ EXPECT_EQ(absl::strings_internal::memcasemem(kHaystack, 10, "Abc", 3),
+ kHaystack);
+ EXPECT_EQ(absl::strings_internal::memcasemem(kHaystack, 10, "Axx", 1),
+ kHaystack);
+ EXPECT_EQ(absl::strings_internal::memcasemem(kHaystack, 10, "hIj", 3),
+ kHaystack + 7);
+ EXPECT_EQ(absl::strings_internal::memcasemem(kHaystack, 10, "jxx", 1),
+ kHaystack + 9);
+ EXPECT_TRUE(absl::strings_internal::memcasemem(kHaystack, 10, "jxx", 3) ==
+ nullptr);
+ EXPECT_TRUE(absl::strings_internal::memcasemem(kHaystack, 10, "xxx", 1) ==
+ nullptr);
+ }
+ {
+ const char kHaystack[] = "0123456789";
+ EXPECT_EQ(absl::strings_internal::memmatch(kHaystack, 0, "", 0), kHaystack);
+ EXPECT_EQ(absl::strings_internal::memmatch(kHaystack, 10, "012", 3),
+ kHaystack);
+ EXPECT_EQ(absl::strings_internal::memmatch(kHaystack, 10, "0xx", 1),
+ kHaystack);
+ EXPECT_EQ(absl::strings_internal::memmatch(kHaystack, 10, "789", 3),
+ kHaystack + 7);
+ EXPECT_EQ(absl::strings_internal::memmatch(kHaystack, 10, "9xx", 1),
+ kHaystack + 9);
+ EXPECT_TRUE(absl::strings_internal::memmatch(kHaystack, 10, "9xx", 3) ==
+ nullptr);
+ EXPECT_TRUE(absl::strings_internal::memmatch(kHaystack, 10, "xxx", 1) ==
+ nullptr);
+ }
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/strings/internal/numbers_test_common.h b/third_party/abseil/src/absl/strings/internal/numbers_test_common.h
new file mode 100644
index 0000000..eaa88a8
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/internal/numbers_test_common.h
@@ -0,0 +1,184 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// This file contains common things needed by numbers_test.cc,
+// numbers_legacy_test.cc and numbers_benchmark.cc.
+
+#ifndef ABSL_STRINGS_INTERNAL_NUMBERS_TEST_COMMON_H_
+#define ABSL_STRINGS_INTERNAL_NUMBERS_TEST_COMMON_H_
+
+#include <array>
+#include <cstdint>
+#include <limits>
+#include <string>
+
+#include "absl/base/config.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace strings_internal {
+
+template <typename IntType>
+inline bool Itoa(IntType value, int base, std::string* destination) {
+ destination->clear();
+ if (base <= 1 || base > 36) {
+ return false;
+ }
+
+ if (value == 0) {
+ destination->push_back('0');
+ return true;
+ }
+
+ bool negative = value < 0;
+ while (value != 0) {
+ const IntType next_value = value / base;
+ // Can't use std::abs here because of problems when IntType is unsigned.
+ int remainder =
+ static_cast<int>(value > next_value * base ? value - next_value * base
+ : next_value * base - value);
+ char c = remainder < 10 ? '0' + remainder : 'A' + remainder - 10;
+ destination->insert(0, 1, c);
+ value = next_value;
+ }
+
+ if (negative) {
+ destination->insert(0, 1, '-');
+ }
+ return true;
+}
+
+struct uint32_test_case {
+ const char* str;
+ bool expect_ok;
+ int base; // base to pass to the conversion function
+ uint32_t expected;
+};
+
+inline const std::array<uint32_test_case, 27>& strtouint32_test_cases() {
+ static const std::array<uint32_test_case, 27> test_cases{{
+ {"0xffffffff", true, 16, (std::numeric_limits<uint32_t>::max)()},
+ {"0x34234324", true, 16, 0x34234324},
+ {"34234324", true, 16, 0x34234324},
+ {"0", true, 16, 0},
+ {" \t\n 0xffffffff", true, 16, (std::numeric_limits<uint32_t>::max)()},
+ {" \f\v 46", true, 10, 46}, // must accept weird whitespace
+ {" \t\n 72717222", true, 8, 072717222},
+ {" \t\n 072717222", true, 8, 072717222},
+ {" \t\n 072717228", false, 8, 07271722},
+ {"0", true, 0, 0},
+
+ // Base-10 version.
+ {"34234324", true, 0, 34234324},
+ {"4294967295", true, 0, (std::numeric_limits<uint32_t>::max)()},
+ {"34234324 \n\t", true, 10, 34234324},
+
+ // Unusual base
+ {"0", true, 3, 0},
+ {"2", true, 3, 2},
+ {"11", true, 3, 4},
+
+ // Invalid uints.
+ {"", false, 0, 0},
+ {" ", false, 0, 0},
+ {"abc", false, 0, 0}, // would be valid hex, but prefix is missing
+ {"34234324a", false, 0, 34234324},
+ {"34234.3", false, 0, 34234},
+ {"-1", false, 0, 0},
+ {" -123", false, 0, 0},
+ {" \t\n -123", false, 0, 0},
+
+ // Out of bounds.
+ {"4294967296", false, 0, (std::numeric_limits<uint32_t>::max)()},
+ {"0x100000000", false, 0, (std::numeric_limits<uint32_t>::max)()},
+ {nullptr, false, 0, 0},
+ }};
+ return test_cases;
+}
+
+struct uint64_test_case {
+ const char* str;
+ bool expect_ok;
+ int base;
+ uint64_t expected;
+};
+
+inline const std::array<uint64_test_case, 34>& strtouint64_test_cases() {
+ static const std::array<uint64_test_case, 34> test_cases{{
+ {"0x3423432448783446", true, 16, int64_t{0x3423432448783446}},
+ {"3423432448783446", true, 16, int64_t{0x3423432448783446}},
+
+ {"0", true, 16, 0},
+ {"000", true, 0, 0},
+ {"0", true, 0, 0},
+ {" \t\n 0xffffffffffffffff", true, 16,
+ (std::numeric_limits<uint64_t>::max)()},
+
+ {"012345670123456701234", true, 8, int64_t{012345670123456701234}},
+ {"12345670123456701234", true, 8, int64_t{012345670123456701234}},
+
+ {"12845670123456701234", false, 8, 0},
+
+ // Base-10 version.
+ {"34234324487834466", true, 0, int64_t{34234324487834466}},
+
+ {" \t\n 18446744073709551615", true, 0,
+ (std::numeric_limits<uint64_t>::max)()},
+
+ {"34234324487834466 \n\t ", true, 0, int64_t{34234324487834466}},
+
+ {" \f\v 46", true, 10, 46}, // must accept weird whitespace
+
+ // Unusual base
+ {"0", true, 3, 0},
+ {"2", true, 3, 2},
+ {"11", true, 3, 4},
+
+ {"0", true, 0, 0},
+
+ // Invalid uints.
+ {"", false, 0, 0},
+ {" ", false, 0, 0},
+ {"abc", false, 0, 0},
+ {"34234324487834466a", false, 0, 0},
+ {"34234487834466.3", false, 0, 0},
+ {"-1", false, 0, 0},
+ {" -123", false, 0, 0},
+ {" \t\n -123", false, 0, 0},
+
+ // Out of bounds.
+ {"18446744073709551616", false, 10, 0},
+ {"18446744073709551616", false, 0, 0},
+ {"0x10000000000000000", false, 16,
+ (std::numeric_limits<uint64_t>::max)()},
+ {"0X10000000000000000", false, 16,
+ (std::numeric_limits<uint64_t>::max)()}, // 0X versus 0x.
+ {"0x10000000000000000", false, 0, (std::numeric_limits<uint64_t>::max)()},
+ {"0X10000000000000000", false, 0,
+ (std::numeric_limits<uint64_t>::max)()}, // 0X versus 0x.
+
+ {"0x1234", true, 16, 0x1234},
+
+ // Base-10 string version.
+ {"1234", true, 0, 1234},
+ {nullptr, false, 0, 0},
+ }};
+ return test_cases;
+}
+
+} // namespace strings_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_STRINGS_INTERNAL_NUMBERS_TEST_COMMON_H_
diff --git a/third_party/abseil/src/absl/strings/internal/ostringstream.cc b/third_party/abseil/src/absl/strings/internal/ostringstream.cc
new file mode 100644
index 0000000..05324c7
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/internal/ostringstream.cc
@@ -0,0 +1,36 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/strings/internal/ostringstream.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace strings_internal {
+
+OStringStream::Buf::int_type OStringStream::overflow(int c) {
+ assert(s_);
+ if (!Buf::traits_type::eq_int_type(c, Buf::traits_type::eof()))
+ s_->push_back(static_cast<char>(c));
+ return 1;
+}
+
+std::streamsize OStringStream::xsputn(const char* s, std::streamsize n) {
+ assert(s_);
+ s_->append(s, n);
+ return n;
+}
+
+} // namespace strings_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/strings/internal/ostringstream.h b/third_party/abseil/src/absl/strings/internal/ostringstream.h
new file mode 100644
index 0000000..d25d604
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/internal/ostringstream.h
@@ -0,0 +1,89 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_STRINGS_INTERNAL_OSTRINGSTREAM_H_
+#define ABSL_STRINGS_INTERNAL_OSTRINGSTREAM_H_
+
+#include <cassert>
+#include <ostream>
+#include <streambuf>
+#include <string>
+
+#include "absl/base/port.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace strings_internal {
+
+// The same as std::ostringstream but appends to a user-specified std::string,
+// and is faster. It is ~70% faster to create, ~50% faster to write to, and
+// completely free to extract the result std::string.
+//
+// std::string s;
+// OStringStream strm(&s);
+// strm << 42 << ' ' << 3.14; // appends to `s`
+//
+// The stream object doesn't have to be named. Starting from C++11 operator<<
+// works with rvalues of std::ostream.
+//
+// std::string s;
+// OStringStream(&s) << 42 << ' ' << 3.14; // appends to `s`
+//
+// OStringStream is faster to create than std::ostringstream but it's still
+// relatively slow. Avoid creating multiple streams where a single stream will
+// do.
+//
+// Creates unnecessary instances of OStringStream: slow.
+//
+// std::string s;
+// OStringStream(&s) << 42;
+// OStringStream(&s) << ' ';
+// OStringStream(&s) << 3.14;
+//
+// Creates a single instance of OStringStream and reuses it: fast.
+//
+// std::string s;
+// OStringStream strm(&s);
+// strm << 42;
+// strm << ' ';
+// strm << 3.14;
+//
+// Note: flush() has no effect. No reason to call it.
+class OStringStream : private std::basic_streambuf<char>, public std::ostream {
+ public:
+ // The argument can be null, in which case you'll need to call str(p) with a
+ // non-null argument before you can write to the stream.
+ //
+ // The destructor of OStringStream doesn't use the std::string. It's OK to
+ // destroy the std::string before the stream.
+ explicit OStringStream(std::string* s) : std::ostream(this), s_(s) {}
+
+ std::string* str() { return s_; }
+ const std::string* str() const { return s_; }
+ void str(std::string* s) { s_ = s; }
+
+ private:
+ using Buf = std::basic_streambuf<char>;
+
+ Buf::int_type overflow(int c) override;
+ std::streamsize xsputn(const char* s, std::streamsize n) override;
+
+ std::string* s_;
+};
+
+} // namespace strings_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_STRINGS_INTERNAL_OSTRINGSTREAM_H_
diff --git a/third_party/abseil/src/absl/strings/internal/ostringstream_benchmark.cc b/third_party/abseil/src/absl/strings/internal/ostringstream_benchmark.cc
new file mode 100644
index 0000000..5979f18
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/internal/ostringstream_benchmark.cc
@@ -0,0 +1,106 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/strings/internal/ostringstream.h"
+
+#include <sstream>
+#include <string>
+
+#include "benchmark/benchmark.h"
+
+namespace {
+
+enum StringType {
+ kNone,
+ kStdString,
+};
+
+// Benchmarks for std::ostringstream.
+template <StringType kOutput>
+void BM_StdStream(benchmark::State& state) {
+ const int num_writes = state.range(0);
+ const int bytes_per_write = state.range(1);
+ const std::string payload(bytes_per_write, 'x');
+ for (auto _ : state) {
+ std::ostringstream strm;
+ benchmark::DoNotOptimize(strm);
+ for (int i = 0; i != num_writes; ++i) {
+ strm << payload;
+ }
+ switch (kOutput) {
+ case kNone: {
+ break;
+ }
+ case kStdString: {
+ std::string s = strm.str();
+ benchmark::DoNotOptimize(s);
+ break;
+ }
+ }
+ }
+}
+
+// Create the stream, optionally write to it, then destroy it.
+BENCHMARK_TEMPLATE(BM_StdStream, kNone)
+ ->ArgPair(0, 0)
+ ->ArgPair(1, 16) // 16 bytes is small enough for SSO
+ ->ArgPair(1, 256) // 256 bytes requires heap allocation
+ ->ArgPair(1024, 256);
+// Create the stream, write to it, get std::string out, then destroy.
+BENCHMARK_TEMPLATE(BM_StdStream, kStdString)
+ ->ArgPair(1, 16) // 16 bytes is small enough for SSO
+ ->ArgPair(1, 256) // 256 bytes requires heap allocation
+ ->ArgPair(1024, 256);
+
+// Benchmarks for OStringStream.
+template <StringType kOutput>
+void BM_CustomStream(benchmark::State& state) {
+ const int num_writes = state.range(0);
+ const int bytes_per_write = state.range(1);
+ const std::string payload(bytes_per_write, 'x');
+ for (auto _ : state) {
+ std::string out;
+ absl::strings_internal::OStringStream strm(&out);
+ benchmark::DoNotOptimize(strm);
+ for (int i = 0; i != num_writes; ++i) {
+ strm << payload;
+ }
+ switch (kOutput) {
+ case kNone: {
+ break;
+ }
+ case kStdString: {
+ std::string s = out;
+ benchmark::DoNotOptimize(s);
+ break;
+ }
+ }
+ }
+}
+
+// Create the stream, optionally write to it, then destroy it.
+BENCHMARK_TEMPLATE(BM_CustomStream, kNone)
+ ->ArgPair(0, 0)
+ ->ArgPair(1, 16) // 16 bytes is small enough for SSO
+ ->ArgPair(1, 256) // 256 bytes requires heap allocation
+ ->ArgPair(1024, 256);
+// Create the stream, write to it, get std::string out, then destroy.
+// It's not useful in practice to extract std::string from OStringStream; we
+// measure it for completeness.
+BENCHMARK_TEMPLATE(BM_CustomStream, kStdString)
+ ->ArgPair(1, 16) // 16 bytes is small enough for SSO
+ ->ArgPair(1, 256) // 256 bytes requires heap allocation
+ ->ArgPair(1024, 256);
+
+} // namespace
diff --git a/third_party/abseil/src/absl/strings/internal/ostringstream_test.cc b/third_party/abseil/src/absl/strings/internal/ostringstream_test.cc
new file mode 100644
index 0000000..2879e50
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/internal/ostringstream_test.cc
@@ -0,0 +1,102 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/strings/internal/ostringstream.h"
+
+#include <memory>
+#include <ostream>
+#include <string>
+#include <type_traits>
+
+#include "gtest/gtest.h"
+
+namespace {
+
+TEST(OStringStream, IsOStream) {
+ static_assert(
+ std::is_base_of<std::ostream, absl::strings_internal::OStringStream>(),
+ "");
+}
+
+TEST(OStringStream, ConstructDestroy) {
+ {
+ absl::strings_internal::OStringStream strm(nullptr);
+ EXPECT_EQ(nullptr, strm.str());
+ }
+ {
+ std::string s = "abc";
+ {
+ absl::strings_internal::OStringStream strm(&s);
+ EXPECT_EQ(&s, strm.str());
+ }
+ EXPECT_EQ("abc", s);
+ }
+ {
+ std::unique_ptr<std::string> s(new std::string);
+ absl::strings_internal::OStringStream strm(s.get());
+ s.reset();
+ }
+}
+
+TEST(OStringStream, Str) {
+ std::string s1;
+ absl::strings_internal::OStringStream strm(&s1);
+ const absl::strings_internal::OStringStream& c_strm(strm);
+
+ static_assert(std::is_same<decltype(strm.str()), std::string*>(), "");
+ static_assert(std::is_same<decltype(c_strm.str()), const std::string*>(), "");
+
+ EXPECT_EQ(&s1, strm.str());
+ EXPECT_EQ(&s1, c_strm.str());
+
+ strm.str(&s1);
+ EXPECT_EQ(&s1, strm.str());
+ EXPECT_EQ(&s1, c_strm.str());
+
+ std::string s2;
+ strm.str(&s2);
+ EXPECT_EQ(&s2, strm.str());
+ EXPECT_EQ(&s2, c_strm.str());
+
+ strm.str(nullptr);
+ EXPECT_EQ(nullptr, strm.str());
+ EXPECT_EQ(nullptr, c_strm.str());
+}
+
+TEST(OStreamStream, WriteToLValue) {
+ std::string s = "abc";
+ {
+ absl::strings_internal::OStringStream strm(&s);
+ EXPECT_EQ("abc", s);
+ strm << "";
+ EXPECT_EQ("abc", s);
+ strm << 42;
+ EXPECT_EQ("abc42", s);
+ strm << 'x' << 'y';
+ EXPECT_EQ("abc42xy", s);
+ }
+ EXPECT_EQ("abc42xy", s);
+}
+
+TEST(OStreamStream, WriteToRValue) {
+ std::string s = "abc";
+ absl::strings_internal::OStringStream(&s) << "";
+ EXPECT_EQ("abc", s);
+ absl::strings_internal::OStringStream(&s) << 42;
+ EXPECT_EQ("abc42", s);
+ absl::strings_internal::OStringStream(&s) << 'x' << 'y';
+ EXPECT_EQ("abc42xy", s);
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/strings/internal/pow10_helper.cc b/third_party/abseil/src/absl/strings/internal/pow10_helper.cc
new file mode 100644
index 0000000..42e96c3
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/internal/pow10_helper.cc
@@ -0,0 +1,122 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/strings/internal/pow10_helper.h"
+
+#include <cmath>
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace strings_internal {
+
+namespace {
+
+// The exact value of 1e23 falls precisely halfway between two representable
+// doubles. Furthermore, the rounding rules we prefer (break ties by rounding
+// to the nearest even) dictate in this case that the number should be rounded
+// down, but this is not completely specified for floating-point literals in
+// C++. (It just says to use the default rounding mode of the standard
+// library.) We ensure the result we want by using a number that has an
+// unambiguous correctly rounded answer.
+constexpr double k1e23 = 9999999999999999e7;
+
+constexpr double kPowersOfTen[] = {
+ 0.0, 1e-323, 1e-322, 1e-321, 1e-320, 1e-319, 1e-318, 1e-317, 1e-316,
+ 1e-315, 1e-314, 1e-313, 1e-312, 1e-311, 1e-310, 1e-309, 1e-308, 1e-307,
+ 1e-306, 1e-305, 1e-304, 1e-303, 1e-302, 1e-301, 1e-300, 1e-299, 1e-298,
+ 1e-297, 1e-296, 1e-295, 1e-294, 1e-293, 1e-292, 1e-291, 1e-290, 1e-289,
+ 1e-288, 1e-287, 1e-286, 1e-285, 1e-284, 1e-283, 1e-282, 1e-281, 1e-280,
+ 1e-279, 1e-278, 1e-277, 1e-276, 1e-275, 1e-274, 1e-273, 1e-272, 1e-271,
+ 1e-270, 1e-269, 1e-268, 1e-267, 1e-266, 1e-265, 1e-264, 1e-263, 1e-262,
+ 1e-261, 1e-260, 1e-259, 1e-258, 1e-257, 1e-256, 1e-255, 1e-254, 1e-253,
+ 1e-252, 1e-251, 1e-250, 1e-249, 1e-248, 1e-247, 1e-246, 1e-245, 1e-244,
+ 1e-243, 1e-242, 1e-241, 1e-240, 1e-239, 1e-238, 1e-237, 1e-236, 1e-235,
+ 1e-234, 1e-233, 1e-232, 1e-231, 1e-230, 1e-229, 1e-228, 1e-227, 1e-226,
+ 1e-225, 1e-224, 1e-223, 1e-222, 1e-221, 1e-220, 1e-219, 1e-218, 1e-217,
+ 1e-216, 1e-215, 1e-214, 1e-213, 1e-212, 1e-211, 1e-210, 1e-209, 1e-208,
+ 1e-207, 1e-206, 1e-205, 1e-204, 1e-203, 1e-202, 1e-201, 1e-200, 1e-199,
+ 1e-198, 1e-197, 1e-196, 1e-195, 1e-194, 1e-193, 1e-192, 1e-191, 1e-190,
+ 1e-189, 1e-188, 1e-187, 1e-186, 1e-185, 1e-184, 1e-183, 1e-182, 1e-181,
+ 1e-180, 1e-179, 1e-178, 1e-177, 1e-176, 1e-175, 1e-174, 1e-173, 1e-172,
+ 1e-171, 1e-170, 1e-169, 1e-168, 1e-167, 1e-166, 1e-165, 1e-164, 1e-163,
+ 1e-162, 1e-161, 1e-160, 1e-159, 1e-158, 1e-157, 1e-156, 1e-155, 1e-154,
+ 1e-153, 1e-152, 1e-151, 1e-150, 1e-149, 1e-148, 1e-147, 1e-146, 1e-145,
+ 1e-144, 1e-143, 1e-142, 1e-141, 1e-140, 1e-139, 1e-138, 1e-137, 1e-136,
+ 1e-135, 1e-134, 1e-133, 1e-132, 1e-131, 1e-130, 1e-129, 1e-128, 1e-127,
+ 1e-126, 1e-125, 1e-124, 1e-123, 1e-122, 1e-121, 1e-120, 1e-119, 1e-118,
+ 1e-117, 1e-116, 1e-115, 1e-114, 1e-113, 1e-112, 1e-111, 1e-110, 1e-109,
+ 1e-108, 1e-107, 1e-106, 1e-105, 1e-104, 1e-103, 1e-102, 1e-101, 1e-100,
+ 1e-99, 1e-98, 1e-97, 1e-96, 1e-95, 1e-94, 1e-93, 1e-92, 1e-91,
+ 1e-90, 1e-89, 1e-88, 1e-87, 1e-86, 1e-85, 1e-84, 1e-83, 1e-82,
+ 1e-81, 1e-80, 1e-79, 1e-78, 1e-77, 1e-76, 1e-75, 1e-74, 1e-73,
+ 1e-72, 1e-71, 1e-70, 1e-69, 1e-68, 1e-67, 1e-66, 1e-65, 1e-64,
+ 1e-63, 1e-62, 1e-61, 1e-60, 1e-59, 1e-58, 1e-57, 1e-56, 1e-55,
+ 1e-54, 1e-53, 1e-52, 1e-51, 1e-50, 1e-49, 1e-48, 1e-47, 1e-46,
+ 1e-45, 1e-44, 1e-43, 1e-42, 1e-41, 1e-40, 1e-39, 1e-38, 1e-37,
+ 1e-36, 1e-35, 1e-34, 1e-33, 1e-32, 1e-31, 1e-30, 1e-29, 1e-28,
+ 1e-27, 1e-26, 1e-25, 1e-24, 1e-23, 1e-22, 1e-21, 1e-20, 1e-19,
+ 1e-18, 1e-17, 1e-16, 1e-15, 1e-14, 1e-13, 1e-12, 1e-11, 1e-10,
+ 1e-9, 1e-8, 1e-7, 1e-6, 1e-5, 1e-4, 1e-3, 1e-2, 1e-1,
+ 1e+0, 1e+1, 1e+2, 1e+3, 1e+4, 1e+5, 1e+6, 1e+7, 1e+8,
+ 1e+9, 1e+10, 1e+11, 1e+12, 1e+13, 1e+14, 1e+15, 1e+16, 1e+17,
+ 1e+18, 1e+19, 1e+20, 1e+21, 1e+22, k1e23, 1e+24, 1e+25, 1e+26,
+ 1e+27, 1e+28, 1e+29, 1e+30, 1e+31, 1e+32, 1e+33, 1e+34, 1e+35,
+ 1e+36, 1e+37, 1e+38, 1e+39, 1e+40, 1e+41, 1e+42, 1e+43, 1e+44,
+ 1e+45, 1e+46, 1e+47, 1e+48, 1e+49, 1e+50, 1e+51, 1e+52, 1e+53,
+ 1e+54, 1e+55, 1e+56, 1e+57, 1e+58, 1e+59, 1e+60, 1e+61, 1e+62,
+ 1e+63, 1e+64, 1e+65, 1e+66, 1e+67, 1e+68, 1e+69, 1e+70, 1e+71,
+ 1e+72, 1e+73, 1e+74, 1e+75, 1e+76, 1e+77, 1e+78, 1e+79, 1e+80,
+ 1e+81, 1e+82, 1e+83, 1e+84, 1e+85, 1e+86, 1e+87, 1e+88, 1e+89,
+ 1e+90, 1e+91, 1e+92, 1e+93, 1e+94, 1e+95, 1e+96, 1e+97, 1e+98,
+ 1e+99, 1e+100, 1e+101, 1e+102, 1e+103, 1e+104, 1e+105, 1e+106, 1e+107,
+ 1e+108, 1e+109, 1e+110, 1e+111, 1e+112, 1e+113, 1e+114, 1e+115, 1e+116,
+ 1e+117, 1e+118, 1e+119, 1e+120, 1e+121, 1e+122, 1e+123, 1e+124, 1e+125,
+ 1e+126, 1e+127, 1e+128, 1e+129, 1e+130, 1e+131, 1e+132, 1e+133, 1e+134,
+ 1e+135, 1e+136, 1e+137, 1e+138, 1e+139, 1e+140, 1e+141, 1e+142, 1e+143,
+ 1e+144, 1e+145, 1e+146, 1e+147, 1e+148, 1e+149, 1e+150, 1e+151, 1e+152,
+ 1e+153, 1e+154, 1e+155, 1e+156, 1e+157, 1e+158, 1e+159, 1e+160, 1e+161,
+ 1e+162, 1e+163, 1e+164, 1e+165, 1e+166, 1e+167, 1e+168, 1e+169, 1e+170,
+ 1e+171, 1e+172, 1e+173, 1e+174, 1e+175, 1e+176, 1e+177, 1e+178, 1e+179,
+ 1e+180, 1e+181, 1e+182, 1e+183, 1e+184, 1e+185, 1e+186, 1e+187, 1e+188,
+ 1e+189, 1e+190, 1e+191, 1e+192, 1e+193, 1e+194, 1e+195, 1e+196, 1e+197,
+ 1e+198, 1e+199, 1e+200, 1e+201, 1e+202, 1e+203, 1e+204, 1e+205, 1e+206,
+ 1e+207, 1e+208, 1e+209, 1e+210, 1e+211, 1e+212, 1e+213, 1e+214, 1e+215,
+ 1e+216, 1e+217, 1e+218, 1e+219, 1e+220, 1e+221, 1e+222, 1e+223, 1e+224,
+ 1e+225, 1e+226, 1e+227, 1e+228, 1e+229, 1e+230, 1e+231, 1e+232, 1e+233,
+ 1e+234, 1e+235, 1e+236, 1e+237, 1e+238, 1e+239, 1e+240, 1e+241, 1e+242,
+ 1e+243, 1e+244, 1e+245, 1e+246, 1e+247, 1e+248, 1e+249, 1e+250, 1e+251,
+ 1e+252, 1e+253, 1e+254, 1e+255, 1e+256, 1e+257, 1e+258, 1e+259, 1e+260,
+ 1e+261, 1e+262, 1e+263, 1e+264, 1e+265, 1e+266, 1e+267, 1e+268, 1e+269,
+ 1e+270, 1e+271, 1e+272, 1e+273, 1e+274, 1e+275, 1e+276, 1e+277, 1e+278,
+ 1e+279, 1e+280, 1e+281, 1e+282, 1e+283, 1e+284, 1e+285, 1e+286, 1e+287,
+ 1e+288, 1e+289, 1e+290, 1e+291, 1e+292, 1e+293, 1e+294, 1e+295, 1e+296,
+ 1e+297, 1e+298, 1e+299, 1e+300, 1e+301, 1e+302, 1e+303, 1e+304, 1e+305,
+ 1e+306, 1e+307, 1e+308,
+};
+
+} // namespace
+
+double Pow10(int exp) {
+ if (exp < -324) {
+ return 0.0;
+ } else if (exp > 308) {
+ return INFINITY;
+ } else {
+ return kPowersOfTen[exp + 324];
+ }
+}
+
+} // namespace strings_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/strings/internal/pow10_helper.h b/third_party/abseil/src/absl/strings/internal/pow10_helper.h
new file mode 100644
index 0000000..c37c2c3
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/internal/pow10_helper.h
@@ -0,0 +1,40 @@
+//
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// This test helper library contains a table of powers of 10, to guarantee
+// precise values are computed across the full range of doubles. We can't rely
+// on the pow() function, because not all standard libraries ship a version
+// that is precise.
+#ifndef ABSL_STRINGS_INTERNAL_POW10_HELPER_H_
+#define ABSL_STRINGS_INTERNAL_POW10_HELPER_H_
+
+#include <vector>
+
+#include "absl/base/config.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace strings_internal {
+
+// Computes the precise value of 10^exp. (I.e. the nearest representable
+// double to the exact value, rounding to nearest-even in the (single) case of
+// being exactly halfway between.)
+double Pow10(int exp);
+
+} // namespace strings_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_STRINGS_INTERNAL_POW10_HELPER_H_
diff --git a/third_party/abseil/src/absl/strings/internal/pow10_helper_test.cc b/third_party/abseil/src/absl/strings/internal/pow10_helper_test.cc
new file mode 100644
index 0000000..a4ff76d
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/internal/pow10_helper_test.cc
@@ -0,0 +1,122 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/strings/internal/pow10_helper.h"
+
+#include <cmath>
+
+#include "gtest/gtest.h"
+#include "absl/strings/str_format.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace strings_internal {
+
+namespace {
+
+struct TestCase {
+ int power; // Testing Pow10(power)
+ uint64_t significand; // Raw bits of the expected value
+ int radix; // significand is adjusted by 2^radix
+};
+
+TEST(Pow10HelperTest, Works) {
+ // The logic in pow10_helper.cc is so simple that theoretically we don't even
+ // need a test. However, we're paranoid and believe that there may be
+ // compilers that don't round floating-point literals correctly, even though
+ // it is specified by the standard. We check various edge cases, just to be
+ // sure.
+ constexpr TestCase kTestCases[] = {
+ // Subnormals
+ {-323, 0x2, -1074},
+ {-322, 0x14, -1074},
+ {-321, 0xca, -1074},
+ {-320, 0x7e8, -1074},
+ {-319, 0x4f10, -1074},
+ {-318, 0x316a2, -1074},
+ {-317, 0x1ee257, -1074},
+ {-316, 0x134d761, -1074},
+ {-315, 0xc1069cd, -1074},
+ {-314, 0x78a42205, -1074},
+ {-313, 0x4b6695433, -1074},
+ {-312, 0x2f201d49fb, -1074},
+ {-311, 0x1d74124e3d1, -1074},
+ {-310, 0x12688b70e62b, -1074},
+ {-309, 0xb8157268fdaf, -1074},
+ {-308, 0x730d67819e8d2, -1074},
+ // Values that are very close to rounding the other way.
+ // Comment shows difference of significand from the true value.
+ {-307, 0x11fa182c40c60d, -1072}, // -.4588
+ {-290, 0x18f2b061aea072, -1016}, // .4854
+ {-276, 0x11BA03F5B21000, -969}, // .4709
+ {-259, 0x1899C2F6732210, -913}, // .4830
+ {-252, 0x1D53844EE47DD1, -890}, // -.4743
+ {-227, 0x1E5297287C2F45, -807}, // -.4708
+ {-198, 0x1322E220A5B17E, -710}, // -.4714
+ {-195, 0x12B010D3E1CF56, -700}, // .4928
+ {-192, 0x123FF06EEA847A, -690}, // .4968
+ {-163, 0x1708D0F84D3DE7, -594}, // -.4977
+ {-145, 0x13FAAC3E3FA1F3, -534}, // -.4785
+ {-111, 0x133D4032C2C7F5, -421}, // .4774
+ {-106, 0x1D5B561574765B, -405}, // -.4869
+ {-104, 0x16EF5B40C2FC77, -398}, // -.4741
+ {-88, 0x197683DF2F268D, -345}, // -.4738
+ {-86, 0x13E497065CD61F, -338}, // .4736
+ {-76, 0x17288E1271F513, -305}, // -.4761
+ {-63, 0x1A53FC9631D10D, -262}, // .4929
+ {-30, 0x14484BFEEBC2A0, -152}, // .4758
+ {-21, 0x12E3B40A0E9B4F, -122}, // -.4916
+ {-5, 0x14F8B588E368F1, -69}, // .4829
+ {23, 0x152D02C7E14AF6, 24}, // -.5000 (exactly, round-to-even)
+ {29, 0x1431E0FAE6D721, 44}, // -.4870
+ {34, 0x1ED09BEAD87C03, 60}, // -.4721
+ {70, 0x172EBAD6DDC73D, 180}, // .4733
+ {105, 0x1BE7ABD3781ECA, 296}, // -.4850
+ {126, 0x17A2ECC414A03F, 366}, // -.4999
+ {130, 0x1CDA62055B2D9E, 379}, // .4855
+ {165, 0x115D847AD00087, 496}, // -.4913
+ {172, 0x14B378469B6732, 519}, // .4818
+ {187, 0x1262DFEEBBB0F9, 569}, // -.4805
+ {210, 0x18557F31326BBB, 645}, // -.4992
+ {212, 0x1302CB5E6F642A, 652}, // -.4838
+ {215, 0x1290BA9A38C7D1, 662}, // -.4881
+ {236, 0x1F736F9B3494E9, 731}, // .4707
+ {244, 0x176EC98994F489, 758}, // .4924
+ {250, 0x1658E3AB795204, 778}, // -.4963
+ {252, 0x117571DDF6C814, 785}, // .4873
+ {254, 0x1B4781EAD1989E, 791}, // -.4887
+ {260, 0x1A03FDE214CAF1, 811}, // .4784
+ {284, 0x1585041B2C477F, 891}, // .4798
+ {304, 0x1D2A1BE4048F90, 957}, // -.4987
+ // Out-of-range values
+ {-324, 0x0, 0},
+ {-325, 0x0, 0},
+ {-326, 0x0, 0},
+ {309, 1, 2000},
+ {310, 1, 2000},
+ {311, 1, 2000},
+ };
+ for (const TestCase& test_case : kTestCases) {
+ EXPECT_EQ(Pow10(test_case.power),
+ std::ldexp(test_case.significand, test_case.radix))
+ << absl::StrFormat("Failure for Pow10(%d): %a vs %a", test_case.power,
+ Pow10(test_case.power),
+ std::ldexp(test_case.significand, test_case.radix));
+ }
+}
+
+} // namespace
+} // namespace strings_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/strings/internal/resize_uninitialized.h b/third_party/abseil/src/absl/strings/internal/resize_uninitialized.h
new file mode 100644
index 0000000..e42628e
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/internal/resize_uninitialized.h
@@ -0,0 +1,73 @@
+//
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+#ifndef ABSL_STRINGS_INTERNAL_RESIZE_UNINITIALIZED_H_
+#define ABSL_STRINGS_INTERNAL_RESIZE_UNINITIALIZED_H_
+
+#include <string>
+#include <type_traits>
+#include <utility>
+
+#include "absl/base/port.h"
+#include "absl/meta/type_traits.h" // for void_t
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace strings_internal {
+
+// Is a subclass of true_type or false_type, depending on whether or not
+// T has a __resize_default_init member.
+template <typename string_type, typename = void>
+struct ResizeUninitializedTraits {
+ using HasMember = std::false_type;
+ static void Resize(string_type* s, size_t new_size) { s->resize(new_size); }
+};
+
+// __resize_default_init is provided by libc++ >= 8.0
+template <typename string_type>
+struct ResizeUninitializedTraits<
+ string_type, absl::void_t<decltype(std::declval<string_type&>()
+ .__resize_default_init(237))> > {
+ using HasMember = std::true_type;
+ static void Resize(string_type* s, size_t new_size) {
+ s->__resize_default_init(new_size);
+ }
+};
+
+// Returns true if the std::string implementation supports a resize where
+// the new characters added to the std::string are left untouched.
+//
+// (A better name might be "STLStringSupportsUninitializedResize", alluding to
+// the previous function.)
+template <typename string_type>
+inline constexpr bool STLStringSupportsNontrashingResize(string_type*) {
+ return ResizeUninitializedTraits<string_type>::HasMember::value;
+}
+
+// Like str->resize(new_size), except any new characters added to "*str" as a
+// result of resizing may be left uninitialized, rather than being filled with
+// '0' bytes. Typically used when code is then going to overwrite the backing
+// store of the std::string with known data.
+template <typename string_type, typename = void>
+inline void STLStringResizeUninitialized(string_type* s, size_t new_size) {
+ ResizeUninitializedTraits<string_type>::Resize(s, new_size);
+}
+
+} // namespace strings_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_STRINGS_INTERNAL_RESIZE_UNINITIALIZED_H_
diff --git a/third_party/abseil/src/absl/strings/internal/resize_uninitialized_test.cc b/third_party/abseil/src/absl/strings/internal/resize_uninitialized_test.cc
new file mode 100644
index 0000000..0f8b3c2
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/internal/resize_uninitialized_test.cc
@@ -0,0 +1,82 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/strings/internal/resize_uninitialized.h"
+
+#include "gtest/gtest.h"
+
+namespace {
+
+int resize_call_count = 0;
+
+// A mock string class whose only purpose is to track how many times its
+// resize() method has been called.
+struct resizable_string {
+ size_t size() const { return 0; }
+ char& operator[](size_t) {
+ static char c = '\0';
+ return c;
+ }
+ void resize(size_t) { resize_call_count += 1; }
+};
+
+int resize_default_init_call_count = 0;
+
+// A mock string class whose only purpose is to track how many times its
+// resize() and __resize_default_init() methods have been called.
+struct resize_default_init_string {
+ size_t size() const { return 0; }
+ char& operator[](size_t) {
+ static char c = '\0';
+ return c;
+ }
+ void resize(size_t) { resize_call_count += 1; }
+ void __resize_default_init(size_t) { resize_default_init_call_count += 1; }
+};
+
+TEST(ResizeUninit, WithAndWithout) {
+ resize_call_count = 0;
+ resize_default_init_call_count = 0;
+ {
+ resizable_string rs;
+
+ EXPECT_EQ(resize_call_count, 0);
+ EXPECT_EQ(resize_default_init_call_count, 0);
+ EXPECT_FALSE(
+ absl::strings_internal::STLStringSupportsNontrashingResize(&rs));
+ EXPECT_EQ(resize_call_count, 0);
+ EXPECT_EQ(resize_default_init_call_count, 0);
+ absl::strings_internal::STLStringResizeUninitialized(&rs, 237);
+ EXPECT_EQ(resize_call_count, 1);
+ EXPECT_EQ(resize_default_init_call_count, 0);
+ }
+
+ resize_call_count = 0;
+ resize_default_init_call_count = 0;
+ {
+ resize_default_init_string rus;
+
+ EXPECT_EQ(resize_call_count, 0);
+ EXPECT_EQ(resize_default_init_call_count, 0);
+ EXPECT_TRUE(
+ absl::strings_internal::STLStringSupportsNontrashingResize(&rus));
+ EXPECT_EQ(resize_call_count, 0);
+ EXPECT_EQ(resize_default_init_call_count, 0);
+ absl::strings_internal::STLStringResizeUninitialized(&rus, 237);
+ EXPECT_EQ(resize_call_count, 0);
+ EXPECT_EQ(resize_default_init_call_count, 1);
+ }
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/strings/internal/stl_type_traits.h b/third_party/abseil/src/absl/strings/internal/stl_type_traits.h
new file mode 100644
index 0000000..6035ca4
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/internal/stl_type_traits.h
@@ -0,0 +1,248 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+// Thie file provides the IsStrictlyBaseOfAndConvertibleToSTLContainer type
+// trait metafunction to assist in working with the _GLIBCXX_DEBUG debug
+// wrappers of STL containers.
+//
+// DO NOT INCLUDE THIS FILE DIRECTLY. Use this file by including
+// absl/strings/str_split.h.
+//
+// IWYU pragma: private, include "absl/strings/str_split.h"
+
+#ifndef ABSL_STRINGS_INTERNAL_STL_TYPE_TRAITS_H_
+#define ABSL_STRINGS_INTERNAL_STL_TYPE_TRAITS_H_
+
+#include <array>
+#include <bitset>
+#include <deque>
+#include <forward_list>
+#include <list>
+#include <map>
+#include <set>
+#include <type_traits>
+#include <unordered_map>
+#include <unordered_set>
+#include <vector>
+
+#include "absl/meta/type_traits.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace strings_internal {
+
+template <typename C, template <typename...> class T>
+struct IsSpecializationImpl : std::false_type {};
+template <template <typename...> class T, typename... Args>
+struct IsSpecializationImpl<T<Args...>, T> : std::true_type {};
+template <typename C, template <typename...> class T>
+using IsSpecialization = IsSpecializationImpl<absl::decay_t<C>, T>;
+
+template <typename C>
+struct IsArrayImpl : std::false_type {};
+template <template <typename, size_t> class A, typename T, size_t N>
+struct IsArrayImpl<A<T, N>> : std::is_same<A<T, N>, std::array<T, N>> {};
+template <typename C>
+using IsArray = IsArrayImpl<absl::decay_t<C>>;
+
+template <typename C>
+struct IsBitsetImpl : std::false_type {};
+template <template <size_t> class B, size_t N>
+struct IsBitsetImpl<B<N>> : std::is_same<B<N>, std::bitset<N>> {};
+template <typename C>
+using IsBitset = IsBitsetImpl<absl::decay_t<C>>;
+
+template <typename C>
+struct IsSTLContainer
+ : absl::disjunction<
+ IsArray<C>, IsBitset<C>, IsSpecialization<C, std::deque>,
+ IsSpecialization<C, std::forward_list>,
+ IsSpecialization<C, std::list>, IsSpecialization<C, std::map>,
+ IsSpecialization<C, std::multimap>, IsSpecialization<C, std::set>,
+ IsSpecialization<C, std::multiset>,
+ IsSpecialization<C, std::unordered_map>,
+ IsSpecialization<C, std::unordered_multimap>,
+ IsSpecialization<C, std::unordered_set>,
+ IsSpecialization<C, std::unordered_multiset>,
+ IsSpecialization<C, std::vector>> {};
+
+template <typename C, template <typename...> class T, typename = void>
+struct IsBaseOfSpecializationImpl : std::false_type {};
+// IsBaseOfSpecializationImpl needs multiple partial specializations to SFINAE
+// on the existence of container dependent types and plug them into the STL
+// template.
+template <typename C, template <typename, typename> class T>
+struct IsBaseOfSpecializationImpl<
+ C, T, absl::void_t<typename C::value_type, typename C::allocator_type>>
+ : std::is_base_of<C,
+ T<typename C::value_type, typename C::allocator_type>> {};
+template <typename C, template <typename, typename, typename> class T>
+struct IsBaseOfSpecializationImpl<
+ C, T,
+ absl::void_t<typename C::key_type, typename C::key_compare,
+ typename C::allocator_type>>
+ : std::is_base_of<C, T<typename C::key_type, typename C::key_compare,
+ typename C::allocator_type>> {};
+template <typename C, template <typename, typename, typename, typename> class T>
+struct IsBaseOfSpecializationImpl<
+ C, T,
+ absl::void_t<typename C::key_type, typename C::mapped_type,
+ typename C::key_compare, typename C::allocator_type>>
+ : std::is_base_of<C,
+ T<typename C::key_type, typename C::mapped_type,
+ typename C::key_compare, typename C::allocator_type>> {
+};
+template <typename C, template <typename, typename, typename, typename> class T>
+struct IsBaseOfSpecializationImpl<
+ C, T,
+ absl::void_t<typename C::key_type, typename C::hasher,
+ typename C::key_equal, typename C::allocator_type>>
+ : std::is_base_of<C, T<typename C::key_type, typename C::hasher,
+ typename C::key_equal, typename C::allocator_type>> {
+};
+template <typename C,
+ template <typename, typename, typename, typename, typename> class T>
+struct IsBaseOfSpecializationImpl<
+ C, T,
+ absl::void_t<typename C::key_type, typename C::mapped_type,
+ typename C::hasher, typename C::key_equal,
+ typename C::allocator_type>>
+ : std::is_base_of<C, T<typename C::key_type, typename C::mapped_type,
+ typename C::hasher, typename C::key_equal,
+ typename C::allocator_type>> {};
+template <typename C, template <typename...> class T>
+using IsBaseOfSpecialization = IsBaseOfSpecializationImpl<absl::decay_t<C>, T>;
+
+template <typename C>
+struct IsBaseOfArrayImpl : std::false_type {};
+template <template <typename, size_t> class A, typename T, size_t N>
+struct IsBaseOfArrayImpl<A<T, N>> : std::is_base_of<A<T, N>, std::array<T, N>> {
+};
+template <typename C>
+using IsBaseOfArray = IsBaseOfArrayImpl<absl::decay_t<C>>;
+
+template <typename C>
+struct IsBaseOfBitsetImpl : std::false_type {};
+template <template <size_t> class B, size_t N>
+struct IsBaseOfBitsetImpl<B<N>> : std::is_base_of<B<N>, std::bitset<N>> {};
+template <typename C>
+using IsBaseOfBitset = IsBaseOfBitsetImpl<absl::decay_t<C>>;
+
+template <typename C>
+struct IsBaseOfSTLContainer
+ : absl::disjunction<IsBaseOfArray<C>, IsBaseOfBitset<C>,
+ IsBaseOfSpecialization<C, std::deque>,
+ IsBaseOfSpecialization<C, std::forward_list>,
+ IsBaseOfSpecialization<C, std::list>,
+ IsBaseOfSpecialization<C, std::map>,
+ IsBaseOfSpecialization<C, std::multimap>,
+ IsBaseOfSpecialization<C, std::set>,
+ IsBaseOfSpecialization<C, std::multiset>,
+ IsBaseOfSpecialization<C, std::unordered_map>,
+ IsBaseOfSpecialization<C, std::unordered_multimap>,
+ IsBaseOfSpecialization<C, std::unordered_set>,
+ IsBaseOfSpecialization<C, std::unordered_multiset>,
+ IsBaseOfSpecialization<C, std::vector>> {};
+
+template <typename C, template <typename...> class T, typename = void>
+struct IsConvertibleToSpecializationImpl : std::false_type {};
+// IsConvertibleToSpecializationImpl needs multiple partial specializations to
+// SFINAE on the existence of container dependent types and plug them into the
+// STL template.
+template <typename C, template <typename, typename> class T>
+struct IsConvertibleToSpecializationImpl<
+ C, T, absl::void_t<typename C::value_type, typename C::allocator_type>>
+ : std::is_convertible<
+ C, T<typename C::value_type, typename C::allocator_type>> {};
+template <typename C, template <typename, typename, typename> class T>
+struct IsConvertibleToSpecializationImpl<
+ C, T,
+ absl::void_t<typename C::key_type, typename C::key_compare,
+ typename C::allocator_type>>
+ : std::is_convertible<C, T<typename C::key_type, typename C::key_compare,
+ typename C::allocator_type>> {};
+template <typename C, template <typename, typename, typename, typename> class T>
+struct IsConvertibleToSpecializationImpl<
+ C, T,
+ absl::void_t<typename C::key_type, typename C::mapped_type,
+ typename C::key_compare, typename C::allocator_type>>
+ : std::is_convertible<
+ C, T<typename C::key_type, typename C::mapped_type,
+ typename C::key_compare, typename C::allocator_type>> {};
+template <typename C, template <typename, typename, typename, typename> class T>
+struct IsConvertibleToSpecializationImpl<
+ C, T,
+ absl::void_t<typename C::key_type, typename C::hasher,
+ typename C::key_equal, typename C::allocator_type>>
+ : std::is_convertible<
+ C, T<typename C::key_type, typename C::hasher, typename C::key_equal,
+ typename C::allocator_type>> {};
+template <typename C,
+ template <typename, typename, typename, typename, typename> class T>
+struct IsConvertibleToSpecializationImpl<
+ C, T,
+ absl::void_t<typename C::key_type, typename C::mapped_type,
+ typename C::hasher, typename C::key_equal,
+ typename C::allocator_type>>
+ : std::is_convertible<C, T<typename C::key_type, typename C::mapped_type,
+ typename C::hasher, typename C::key_equal,
+ typename C::allocator_type>> {};
+template <typename C, template <typename...> class T>
+using IsConvertibleToSpecialization =
+ IsConvertibleToSpecializationImpl<absl::decay_t<C>, T>;
+
+template <typename C>
+struct IsConvertibleToArrayImpl : std::false_type {};
+template <template <typename, size_t> class A, typename T, size_t N>
+struct IsConvertibleToArrayImpl<A<T, N>>
+ : std::is_convertible<A<T, N>, std::array<T, N>> {};
+template <typename C>
+using IsConvertibleToArray = IsConvertibleToArrayImpl<absl::decay_t<C>>;
+
+template <typename C>
+struct IsConvertibleToBitsetImpl : std::false_type {};
+template <template <size_t> class B, size_t N>
+struct IsConvertibleToBitsetImpl<B<N>>
+ : std::is_convertible<B<N>, std::bitset<N>> {};
+template <typename C>
+using IsConvertibleToBitset = IsConvertibleToBitsetImpl<absl::decay_t<C>>;
+
+template <typename C>
+struct IsConvertibleToSTLContainer
+ : absl::disjunction<
+ IsConvertibleToArray<C>, IsConvertibleToBitset<C>,
+ IsConvertibleToSpecialization<C, std::deque>,
+ IsConvertibleToSpecialization<C, std::forward_list>,
+ IsConvertibleToSpecialization<C, std::list>,
+ IsConvertibleToSpecialization<C, std::map>,
+ IsConvertibleToSpecialization<C, std::multimap>,
+ IsConvertibleToSpecialization<C, std::set>,
+ IsConvertibleToSpecialization<C, std::multiset>,
+ IsConvertibleToSpecialization<C, std::unordered_map>,
+ IsConvertibleToSpecialization<C, std::unordered_multimap>,
+ IsConvertibleToSpecialization<C, std::unordered_set>,
+ IsConvertibleToSpecialization<C, std::unordered_multiset>,
+ IsConvertibleToSpecialization<C, std::vector>> {};
+
+template <typename C>
+struct IsStrictlyBaseOfAndConvertibleToSTLContainer
+ : absl::conjunction<absl::negation<IsSTLContainer<C>>,
+ IsBaseOfSTLContainer<C>,
+ IsConvertibleToSTLContainer<C>> {};
+
+} // namespace strings_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+#endif // ABSL_STRINGS_INTERNAL_STL_TYPE_TRAITS_H_
diff --git a/third_party/abseil/src/absl/strings/internal/str_format/arg.cc b/third_party/abseil/src/absl/strings/internal/str_format/arg.cc
new file mode 100644
index 0000000..e28a29b
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/internal/str_format/arg.cc
@@ -0,0 +1,488 @@
+// Copyright 2020 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//
+// POSIX spec:
+// http://pubs.opengroup.org/onlinepubs/009695399/functions/fprintf.html
+//
+#include "absl/strings/internal/str_format/arg.h"
+
+#include <cassert>
+#include <cerrno>
+#include <cstdlib>
+#include <string>
+#include <type_traits>
+
+#include "absl/base/port.h"
+#include "absl/strings/internal/str_format/float_conversion.h"
+#include "absl/strings/numbers.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace str_format_internal {
+namespace {
+
+// Reduce *capacity by s.size(), clipped to a 0 minimum.
+void ReducePadding(string_view s, size_t *capacity) {
+ *capacity = Excess(s.size(), *capacity);
+}
+
+// Reduce *capacity by n, clipped to a 0 minimum.
+void ReducePadding(size_t n, size_t *capacity) {
+ *capacity = Excess(n, *capacity);
+}
+
+template <typename T>
+struct MakeUnsigned : std::make_unsigned<T> {};
+template <>
+struct MakeUnsigned<absl::int128> {
+ using type = absl::uint128;
+};
+template <>
+struct MakeUnsigned<absl::uint128> {
+ using type = absl::uint128;
+};
+
+template <typename T>
+struct IsSigned : std::is_signed<T> {};
+template <>
+struct IsSigned<absl::int128> : std::true_type {};
+template <>
+struct IsSigned<absl::uint128> : std::false_type {};
+
+// Integral digit printer.
+// Call one of the PrintAs* routines after construction once.
+// Use with_neg_and_zero/without_neg_or_zero/is_negative to access the results.
+class IntDigits {
+ public:
+ // Print the unsigned integer as octal.
+ // Supports unsigned integral types and uint128.
+ template <typename T>
+ void PrintAsOct(T v) {
+ static_assert(!IsSigned<T>::value, "");
+ char *p = storage_ + sizeof(storage_);
+ do {
+ *--p = static_cast<char>('0' + (static_cast<size_t>(v) & 7));
+ v >>= 3;
+ } while (v);
+ start_ = p;
+ size_ = storage_ + sizeof(storage_) - p;
+ }
+
+ // Print the signed or unsigned integer as decimal.
+ // Supports all integral types.
+ template <typename T>
+ void PrintAsDec(T v) {
+ static_assert(std::is_integral<T>::value, "");
+ start_ = storage_;
+ size_ = numbers_internal::FastIntToBuffer(v, storage_) - storage_;
+ }
+
+ void PrintAsDec(int128 v) {
+ auto u = static_cast<uint128>(v);
+ bool add_neg = false;
+ if (v < 0) {
+ add_neg = true;
+ u = uint128{} - u;
+ }
+ PrintAsDec(u, add_neg);
+ }
+
+ void PrintAsDec(uint128 v, bool add_neg = false) {
+ // This function can be sped up if needed. We can call FastIntToBuffer
+ // twice, or fix FastIntToBuffer to support uint128.
+ char *p = storage_ + sizeof(storage_);
+ do {
+ p -= 2;
+ numbers_internal::PutTwoDigits(static_cast<size_t>(v % 100), p);
+ v /= 100;
+ } while (v);
+ if (p[0] == '0') {
+ // We printed one too many hexits.
+ ++p;
+ }
+ if (add_neg) {
+ *--p = '-';
+ }
+ size_ = storage_ + sizeof(storage_) - p;
+ start_ = p;
+ }
+
+ // Print the unsigned integer as hex using lowercase.
+ // Supports unsigned integral types and uint128.
+ template <typename T>
+ void PrintAsHexLower(T v) {
+ static_assert(!IsSigned<T>::value, "");
+ char *p = storage_ + sizeof(storage_);
+
+ do {
+ p -= 2;
+ constexpr const char* table = numbers_internal::kHexTable;
+ std::memcpy(p, table + 2 * (static_cast<size_t>(v) & 0xFF), 2);
+ if (sizeof(T) == 1) break;
+ v >>= 8;
+ } while (v);
+ if (p[0] == '0') {
+ // We printed one too many digits.
+ ++p;
+ }
+ start_ = p;
+ size_ = storage_ + sizeof(storage_) - p;
+ }
+
+ // Print the unsigned integer as hex using uppercase.
+ // Supports unsigned integral types and uint128.
+ template <typename T>
+ void PrintAsHexUpper(T v) {
+ static_assert(!IsSigned<T>::value, "");
+ char *p = storage_ + sizeof(storage_);
+
+ // kHexTable is only lowercase, so do it manually for uppercase.
+ do {
+ *--p = "0123456789ABCDEF"[static_cast<size_t>(v) & 15];
+ v >>= 4;
+ } while (v);
+ start_ = p;
+ size_ = storage_ + sizeof(storage_) - p;
+ }
+
+ // The printed value including the '-' sign if available.
+ // For inputs of value `0`, this will return "0"
+ string_view with_neg_and_zero() const { return {start_, size_}; }
+
+ // The printed value not including the '-' sign.
+ // For inputs of value `0`, this will return "".
+ string_view without_neg_or_zero() const {
+ static_assert('-' < '0', "The check below verifies both.");
+ size_t advance = start_[0] <= '0' ? 1 : 0;
+ return {start_ + advance, size_ - advance};
+ }
+
+ bool is_negative() const { return start_[0] == '-'; }
+
+ private:
+ const char *start_;
+ size_t size_;
+ // Max size: 128 bit value as octal -> 43 digits, plus sign char
+ char storage_[128 / 3 + 1 + 1];
+};
+
+// Note: 'o' conversions do not have a base indicator, it's just that
+// the '#' flag is specified to modify the precision for 'o' conversions.
+string_view BaseIndicator(const IntDigits &as_digits,
+ const FormatConversionSpecImpl conv) {
+ // always show 0x for %p.
+ bool alt = conv.has_alt_flag() ||
+ conv.conversion_char() == FormatConversionCharInternal::p;
+ bool hex = (conv.conversion_char() == FormatConversionCharInternal::x ||
+ conv.conversion_char() == FormatConversionCharInternal::X ||
+ conv.conversion_char() == FormatConversionCharInternal::p);
+ // From the POSIX description of '#' flag:
+ // "For x or X conversion specifiers, a non-zero result shall have
+ // 0x (or 0X) prefixed to it."
+ if (alt && hex && !as_digits.without_neg_or_zero().empty()) {
+ return conv.conversion_char() == FormatConversionCharInternal::X ? "0X"
+ : "0x";
+ }
+ return {};
+}
+
+string_view SignColumn(bool neg, const FormatConversionSpecImpl conv) {
+ if (conv.conversion_char() == FormatConversionCharInternal::d ||
+ conv.conversion_char() == FormatConversionCharInternal::i) {
+ if (neg) return "-";
+ if (conv.has_show_pos_flag()) return "+";
+ if (conv.has_sign_col_flag()) return " ";
+ }
+ return {};
+}
+
+bool ConvertCharImpl(unsigned char v, const FormatConversionSpecImpl conv,
+ FormatSinkImpl *sink) {
+ size_t fill = 0;
+ if (conv.width() >= 0) fill = conv.width();
+ ReducePadding(1, &fill);
+ if (!conv.has_left_flag()) sink->Append(fill, ' ');
+ sink->Append(1, v);
+ if (conv.has_left_flag()) sink->Append(fill, ' ');
+ return true;
+}
+
+bool ConvertIntImplInnerSlow(const IntDigits &as_digits,
+ const FormatConversionSpecImpl conv,
+ FormatSinkImpl *sink) {
+ // Print as a sequence of Substrings:
+ // [left_spaces][sign][base_indicator][zeroes][formatted][right_spaces]
+ size_t fill = 0;
+ if (conv.width() >= 0) fill = conv.width();
+
+ string_view formatted = as_digits.without_neg_or_zero();
+ ReducePadding(formatted, &fill);
+
+ string_view sign = SignColumn(as_digits.is_negative(), conv);
+ ReducePadding(sign, &fill);
+
+ string_view base_indicator = BaseIndicator(as_digits, conv);
+ ReducePadding(base_indicator, &fill);
+
+ int precision = conv.precision();
+ bool precision_specified = precision >= 0;
+ if (!precision_specified)
+ precision = 1;
+
+ if (conv.has_alt_flag() &&
+ conv.conversion_char() == FormatConversionCharInternal::o) {
+ // From POSIX description of the '#' (alt) flag:
+ // "For o conversion, it increases the precision (if necessary) to
+ // force the first digit of the result to be zero."
+ if (formatted.empty() || *formatted.begin() != '0') {
+ int needed = static_cast<int>(formatted.size()) + 1;
+ precision = std::max(precision, needed);
+ }
+ }
+
+ size_t num_zeroes = Excess(formatted.size(), precision);
+ ReducePadding(num_zeroes, &fill);
+
+ size_t num_left_spaces = !conv.has_left_flag() ? fill : 0;
+ size_t num_right_spaces = conv.has_left_flag() ? fill : 0;
+
+ // From POSIX description of the '0' (zero) flag:
+ // "For d, i, o, u, x, and X conversion specifiers, if a precision
+ // is specified, the '0' flag is ignored."
+ if (!precision_specified && conv.has_zero_flag()) {
+ num_zeroes += num_left_spaces;
+ num_left_spaces = 0;
+ }
+
+ sink->Append(num_left_spaces, ' ');
+ sink->Append(sign);
+ sink->Append(base_indicator);
+ sink->Append(num_zeroes, '0');
+ sink->Append(formatted);
+ sink->Append(num_right_spaces, ' ');
+ return true;
+}
+
+template <typename T>
+bool ConvertIntArg(T v, const FormatConversionSpecImpl conv,
+ FormatSinkImpl *sink) {
+ using U = typename MakeUnsigned<T>::type;
+ IntDigits as_digits;
+
+ // This odd casting is due to a bug in -Wswitch behavior in gcc49 which causes
+ // it to complain about a switch/case type mismatch, even though both are
+ // FormatConverionChar. Likely this is because at this point
+ // FormatConversionChar is declared, but not defined.
+ switch (static_cast<uint8_t>(conv.conversion_char())) {
+ case static_cast<uint8_t>(FormatConversionCharInternal::c):
+ return ConvertCharImpl(static_cast<unsigned char>(v), conv, sink);
+
+ case static_cast<uint8_t>(FormatConversionCharInternal::o):
+ as_digits.PrintAsOct(static_cast<U>(v));
+ break;
+
+ case static_cast<uint8_t>(FormatConversionCharInternal::x):
+ as_digits.PrintAsHexLower(static_cast<U>(v));
+ break;
+ case static_cast<uint8_t>(FormatConversionCharInternal::X):
+ as_digits.PrintAsHexUpper(static_cast<U>(v));
+ break;
+
+ case static_cast<uint8_t>(FormatConversionCharInternal::u):
+ as_digits.PrintAsDec(static_cast<U>(v));
+ break;
+
+ case static_cast<uint8_t>(FormatConversionCharInternal::d):
+ case static_cast<uint8_t>(FormatConversionCharInternal::i):
+ as_digits.PrintAsDec(v);
+ break;
+
+ case static_cast<uint8_t>(FormatConversionCharInternal::a):
+ case static_cast<uint8_t>(FormatConversionCharInternal::e):
+ case static_cast<uint8_t>(FormatConversionCharInternal::f):
+ case static_cast<uint8_t>(FormatConversionCharInternal::g):
+ case static_cast<uint8_t>(FormatConversionCharInternal::A):
+ case static_cast<uint8_t>(FormatConversionCharInternal::E):
+ case static_cast<uint8_t>(FormatConversionCharInternal::F):
+ case static_cast<uint8_t>(FormatConversionCharInternal::G):
+ return ConvertFloatImpl(static_cast<double>(v), conv, sink);
+
+ default:
+ ABSL_INTERNAL_ASSUME(false);
+ }
+
+ if (conv.is_basic()) {
+ sink->Append(as_digits.with_neg_and_zero());
+ return true;
+ }
+ return ConvertIntImplInnerSlow(as_digits, conv, sink);
+}
+
+template <typename T>
+bool ConvertFloatArg(T v, const FormatConversionSpecImpl conv,
+ FormatSinkImpl *sink) {
+ return FormatConversionCharIsFloat(conv.conversion_char()) &&
+ ConvertFloatImpl(v, conv, sink);
+}
+
+inline bool ConvertStringArg(string_view v, const FormatConversionSpecImpl conv,
+ FormatSinkImpl *sink) {
+ if (conv.is_basic()) {
+ sink->Append(v);
+ return true;
+ }
+ return sink->PutPaddedString(v, conv.width(), conv.precision(),
+ conv.has_left_flag());
+}
+
+} // namespace
+
+// ==================== Strings ====================
+StringConvertResult FormatConvertImpl(const std::string &v,
+ const FormatConversionSpecImpl conv,
+ FormatSinkImpl *sink) {
+ return {ConvertStringArg(v, conv, sink)};
+}
+
+StringConvertResult FormatConvertImpl(string_view v,
+ const FormatConversionSpecImpl conv,
+ FormatSinkImpl *sink) {
+ return {ConvertStringArg(v, conv, sink)};
+}
+
+ArgConvertResult<FormatConversionCharSetUnion(
+ FormatConversionCharSetInternal::s, FormatConversionCharSetInternal::p)>
+FormatConvertImpl(const char *v, const FormatConversionSpecImpl conv,
+ FormatSinkImpl *sink) {
+ if (conv.conversion_char() == FormatConversionCharInternal::p)
+ return {FormatConvertImpl(VoidPtr(v), conv, sink).value};
+ size_t len;
+ if (v == nullptr) {
+ len = 0;
+ } else if (conv.precision() < 0) {
+ len = std::strlen(v);
+ } else {
+ // If precision is set, we look for the NUL-terminator on the valid range.
+ len = std::find(v, v + conv.precision(), '\0') - v;
+ }
+ return {ConvertStringArg(string_view(v, len), conv, sink)};
+}
+
+// ==================== Raw pointers ====================
+ArgConvertResult<FormatConversionCharSetInternal::p> FormatConvertImpl(
+ VoidPtr v, const FormatConversionSpecImpl conv, FormatSinkImpl *sink) {
+ if (!v.value) {
+ sink->Append("(nil)");
+ return {true};
+ }
+ IntDigits as_digits;
+ as_digits.PrintAsHexLower(v.value);
+ return {ConvertIntImplInnerSlow(as_digits, conv, sink)};
+}
+
+// ==================== Floats ====================
+FloatingConvertResult FormatConvertImpl(float v,
+ const FormatConversionSpecImpl conv,
+ FormatSinkImpl *sink) {
+ return {ConvertFloatArg(v, conv, sink)};
+}
+FloatingConvertResult FormatConvertImpl(double v,
+ const FormatConversionSpecImpl conv,
+ FormatSinkImpl *sink) {
+ return {ConvertFloatArg(v, conv, sink)};
+}
+FloatingConvertResult FormatConvertImpl(long double v,
+ const FormatConversionSpecImpl conv,
+ FormatSinkImpl *sink) {
+ return {ConvertFloatArg(v, conv, sink)};
+}
+
+// ==================== Chars ====================
+IntegralConvertResult FormatConvertImpl(char v,
+ const FormatConversionSpecImpl conv,
+ FormatSinkImpl *sink) {
+ return {ConvertIntArg(v, conv, sink)};
+}
+IntegralConvertResult FormatConvertImpl(signed char v,
+ const FormatConversionSpecImpl conv,
+ FormatSinkImpl *sink) {
+ return {ConvertIntArg(v, conv, sink)};
+}
+IntegralConvertResult FormatConvertImpl(unsigned char v,
+ const FormatConversionSpecImpl conv,
+ FormatSinkImpl *sink) {
+ return {ConvertIntArg(v, conv, sink)};
+}
+
+// ==================== Ints ====================
+IntegralConvertResult FormatConvertImpl(short v, // NOLINT
+ const FormatConversionSpecImpl conv,
+ FormatSinkImpl *sink) {
+ return {ConvertIntArg(v, conv, sink)};
+}
+IntegralConvertResult FormatConvertImpl(unsigned short v, // NOLINT
+ const FormatConversionSpecImpl conv,
+ FormatSinkImpl *sink) {
+ return {ConvertIntArg(v, conv, sink)};
+}
+IntegralConvertResult FormatConvertImpl(int v,
+ const FormatConversionSpecImpl conv,
+ FormatSinkImpl *sink) {
+ return {ConvertIntArg(v, conv, sink)};
+}
+IntegralConvertResult FormatConvertImpl(unsigned v,
+ const FormatConversionSpecImpl conv,
+ FormatSinkImpl *sink) {
+ return {ConvertIntArg(v, conv, sink)};
+}
+IntegralConvertResult FormatConvertImpl(long v, // NOLINT
+ const FormatConversionSpecImpl conv,
+ FormatSinkImpl *sink) {
+ return {ConvertIntArg(v, conv, sink)};
+}
+IntegralConvertResult FormatConvertImpl(unsigned long v, // NOLINT
+ const FormatConversionSpecImpl conv,
+ FormatSinkImpl *sink) {
+ return {ConvertIntArg(v, conv, sink)};
+}
+IntegralConvertResult FormatConvertImpl(long long v, // NOLINT
+ const FormatConversionSpecImpl conv,
+ FormatSinkImpl *sink) {
+ return {ConvertIntArg(v, conv, sink)};
+}
+IntegralConvertResult FormatConvertImpl(unsigned long long v, // NOLINT
+ const FormatConversionSpecImpl conv,
+ FormatSinkImpl *sink) {
+ return {ConvertIntArg(v, conv, sink)};
+}
+IntegralConvertResult FormatConvertImpl(absl::int128 v,
+ const FormatConversionSpecImpl conv,
+ FormatSinkImpl *sink) {
+ return {ConvertIntArg(v, conv, sink)};
+}
+IntegralConvertResult FormatConvertImpl(absl::uint128 v,
+ const FormatConversionSpecImpl conv,
+ FormatSinkImpl *sink) {
+ return {ConvertIntArg(v, conv, sink)};
+}
+
+ABSL_INTERNAL_FORMAT_DISPATCH_OVERLOADS_EXPAND_();
+
+
+
+} // namespace str_format_internal
+
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/strings/internal/str_format/arg.h b/third_party/abseil/src/absl/strings/internal/str_format/arg.h
new file mode 100644
index 0000000..7040c86
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/internal/str_format/arg.h
@@ -0,0 +1,518 @@
+// Copyright 2020 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_STRINGS_INTERNAL_STR_FORMAT_ARG_H_
+#define ABSL_STRINGS_INTERNAL_STR_FORMAT_ARG_H_
+
+#include <string.h>
+#include <wchar.h>
+
+#include <cstdio>
+#include <iomanip>
+#include <limits>
+#include <memory>
+#include <sstream>
+#include <string>
+#include <type_traits>
+
+#include "absl/base/port.h"
+#include "absl/meta/type_traits.h"
+#include "absl/numeric/int128.h"
+#include "absl/strings/internal/str_format/extension.h"
+#include "absl/strings/string_view.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+class Cord;
+class FormatCountCapture;
+class FormatSink;
+
+template <absl::FormatConversionCharSet C>
+struct FormatConvertResult;
+class FormatConversionSpec;
+
+namespace str_format_internal {
+
+template <typename T, typename = void>
+struct HasUserDefinedConvert : std::false_type {};
+
+template <typename T>
+struct HasUserDefinedConvert<T, void_t<decltype(AbslFormatConvert(
+ std::declval<const T&>(),
+ std::declval<const FormatConversionSpec&>(),
+ std::declval<FormatSink*>()))>>
+ : std::true_type {};
+
+void AbslFormatConvert(); // Stops the lexical name lookup
+template <typename T>
+auto FormatConvertImpl(const T& v, FormatConversionSpecImpl conv,
+ FormatSinkImpl* sink)
+ -> decltype(AbslFormatConvert(v,
+ std::declval<const FormatConversionSpec&>(),
+ std::declval<FormatSink*>())) {
+ using FormatConversionSpecT =
+ absl::enable_if_t<sizeof(const T& (*)()) != 0, FormatConversionSpec>;
+ using FormatSinkT =
+ absl::enable_if_t<sizeof(const T& (*)()) != 0, FormatSink>;
+ auto fcs = conv.Wrap<FormatConversionSpecT>();
+ auto fs = sink->Wrap<FormatSinkT>();
+ return AbslFormatConvert(v, fcs, &fs);
+}
+
+template <typename T>
+class StreamedWrapper;
+
+// If 'v' can be converted (in the printf sense) according to 'conv',
+// then convert it, appending to `sink` and return `true`.
+// Otherwise fail and return `false`.
+
+// AbslFormatConvert(v, conv, sink) is intended to be found by ADL on 'v'
+// as an extension mechanism. These FormatConvertImpl functions are the default
+// implementations.
+// The ADL search is augmented via the 'Sink*' parameter, which also
+// serves as a disambiguator to reject possible unintended 'AbslFormatConvert'
+// functions in the namespaces associated with 'v'.
+
+// Raw pointers.
+struct VoidPtr {
+ VoidPtr() = default;
+ template <typename T,
+ decltype(reinterpret_cast<uintptr_t>(std::declval<T*>())) = 0>
+ VoidPtr(T* ptr) // NOLINT
+ : value(ptr ? reinterpret_cast<uintptr_t>(ptr) : 0) {}
+ uintptr_t value;
+};
+
+template <FormatConversionCharSet C>
+struct ArgConvertResult {
+ bool value;
+};
+
+template <FormatConversionCharSet C>
+constexpr FormatConversionCharSet ExtractCharSet(FormatConvertResult<C>) {
+ return C;
+}
+
+template <FormatConversionCharSet C>
+constexpr FormatConversionCharSet ExtractCharSet(ArgConvertResult<C>) {
+ return C;
+}
+
+using StringConvertResult =
+ ArgConvertResult<FormatConversionCharSetInternal::s>;
+ArgConvertResult<FormatConversionCharSetInternal::p> FormatConvertImpl(
+ VoidPtr v, FormatConversionSpecImpl conv, FormatSinkImpl* sink);
+
+// Strings.
+StringConvertResult FormatConvertImpl(const std::string& v,
+ FormatConversionSpecImpl conv,
+ FormatSinkImpl* sink);
+StringConvertResult FormatConvertImpl(string_view v,
+ FormatConversionSpecImpl conv,
+ FormatSinkImpl* sink);
+ArgConvertResult<FormatConversionCharSetUnion(
+ FormatConversionCharSetInternal::s, FormatConversionCharSetInternal::p)>
+FormatConvertImpl(const char* v, const FormatConversionSpecImpl conv,
+ FormatSinkImpl* sink);
+
+template <class AbslCord, typename std::enable_if<std::is_same<
+ AbslCord, absl::Cord>::value>::type* = nullptr>
+StringConvertResult FormatConvertImpl(const AbslCord& value,
+ FormatConversionSpecImpl conv,
+ FormatSinkImpl* sink) {
+ bool is_left = conv.has_left_flag();
+ size_t space_remaining = 0;
+
+ int width = conv.width();
+ if (width >= 0) space_remaining = width;
+
+ size_t to_write = value.size();
+
+ int precision = conv.precision();
+ if (precision >= 0)
+ to_write = (std::min)(to_write, static_cast<size_t>(precision));
+
+ space_remaining = Excess(to_write, space_remaining);
+
+ if (space_remaining > 0 && !is_left) sink->Append(space_remaining, ' ');
+
+ for (string_view piece : value.Chunks()) {
+ if (piece.size() > to_write) {
+ piece.remove_suffix(piece.size() - to_write);
+ to_write = 0;
+ } else {
+ to_write -= piece.size();
+ }
+ sink->Append(piece);
+ if (to_write == 0) {
+ break;
+ }
+ }
+
+ if (space_remaining > 0 && is_left) sink->Append(space_remaining, ' ');
+ return {true};
+}
+
+using IntegralConvertResult = ArgConvertResult<FormatConversionCharSetUnion(
+ FormatConversionCharSetInternal::c,
+ FormatConversionCharSetInternal::kNumeric,
+ FormatConversionCharSetInternal::kStar)>;
+using FloatingConvertResult =
+ ArgConvertResult<FormatConversionCharSetInternal::kFloating>;
+
+// Floats.
+FloatingConvertResult FormatConvertImpl(float v, FormatConversionSpecImpl conv,
+ FormatSinkImpl* sink);
+FloatingConvertResult FormatConvertImpl(double v, FormatConversionSpecImpl conv,
+ FormatSinkImpl* sink);
+FloatingConvertResult FormatConvertImpl(long double v,
+ FormatConversionSpecImpl conv,
+ FormatSinkImpl* sink);
+
+// Chars.
+IntegralConvertResult FormatConvertImpl(char v, FormatConversionSpecImpl conv,
+ FormatSinkImpl* sink);
+IntegralConvertResult FormatConvertImpl(signed char v,
+ FormatConversionSpecImpl conv,
+ FormatSinkImpl* sink);
+IntegralConvertResult FormatConvertImpl(unsigned char v,
+ FormatConversionSpecImpl conv,
+ FormatSinkImpl* sink);
+
+// Ints.
+IntegralConvertResult FormatConvertImpl(short v, // NOLINT
+ FormatConversionSpecImpl conv,
+ FormatSinkImpl* sink);
+IntegralConvertResult FormatConvertImpl(unsigned short v, // NOLINT
+ FormatConversionSpecImpl conv,
+ FormatSinkImpl* sink);
+IntegralConvertResult FormatConvertImpl(int v, FormatConversionSpecImpl conv,
+ FormatSinkImpl* sink);
+IntegralConvertResult FormatConvertImpl(unsigned v,
+ FormatConversionSpecImpl conv,
+ FormatSinkImpl* sink);
+IntegralConvertResult FormatConvertImpl(long v, // NOLINT
+ FormatConversionSpecImpl conv,
+ FormatSinkImpl* sink);
+IntegralConvertResult FormatConvertImpl(unsigned long v, // NOLINT
+ FormatConversionSpecImpl conv,
+ FormatSinkImpl* sink);
+IntegralConvertResult FormatConvertImpl(long long v, // NOLINT
+ FormatConversionSpecImpl conv,
+ FormatSinkImpl* sink);
+IntegralConvertResult FormatConvertImpl(unsigned long long v, // NOLINT
+ FormatConversionSpecImpl conv,
+ FormatSinkImpl* sink);
+IntegralConvertResult FormatConvertImpl(int128 v, FormatConversionSpecImpl conv,
+ FormatSinkImpl* sink);
+IntegralConvertResult FormatConvertImpl(uint128 v,
+ FormatConversionSpecImpl conv,
+ FormatSinkImpl* sink);
+template <typename T, enable_if_t<std::is_same<T, bool>::value, int> = 0>
+IntegralConvertResult FormatConvertImpl(T v, FormatConversionSpecImpl conv,
+ FormatSinkImpl* sink) {
+ return FormatConvertImpl(static_cast<int>(v), conv, sink);
+}
+
+// We provide this function to help the checker, but it is never defined.
+// FormatArgImpl will use the underlying Convert functions instead.
+template <typename T>
+typename std::enable_if<std::is_enum<T>::value &&
+ !HasUserDefinedConvert<T>::value,
+ IntegralConvertResult>::type
+FormatConvertImpl(T v, FormatConversionSpecImpl conv, FormatSinkImpl* sink);
+
+template <typename T>
+StringConvertResult FormatConvertImpl(const StreamedWrapper<T>& v,
+ FormatConversionSpecImpl conv,
+ FormatSinkImpl* out) {
+ std::ostringstream oss;
+ oss << v.v_;
+ if (!oss) return {false};
+ return str_format_internal::FormatConvertImpl(oss.str(), conv, out);
+}
+
+// Use templates and dependent types to delay evaluation of the function
+// until after FormatCountCapture is fully defined.
+struct FormatCountCaptureHelper {
+ template <class T = int>
+ static ArgConvertResult<FormatConversionCharSetInternal::n> ConvertHelper(
+ const FormatCountCapture& v, FormatConversionSpecImpl conv,
+ FormatSinkImpl* sink) {
+ const absl::enable_if_t<sizeof(T) != 0, FormatCountCapture>& v2 = v;
+
+ if (conv.conversion_char() !=
+ str_format_internal::FormatConversionCharInternal::n) {
+ return {false};
+ }
+ *v2.p_ = static_cast<int>(sink->size());
+ return {true};
+ }
+};
+
+template <class T = int>
+ArgConvertResult<FormatConversionCharSetInternal::n> FormatConvertImpl(
+ const FormatCountCapture& v, FormatConversionSpecImpl conv,
+ FormatSinkImpl* sink) {
+ return FormatCountCaptureHelper::ConvertHelper(v, conv, sink);
+}
+
+// Helper friend struct to hide implementation details from the public API of
+// FormatArgImpl.
+struct FormatArgImplFriend {
+ template <typename Arg>
+ static bool ToInt(Arg arg, int* out) {
+ // A value initialized FormatConversionSpecImpl has a `none` conv, which
+ // tells the dispatcher to run the `int` conversion.
+ return arg.dispatcher_(arg.data_, {}, out);
+ }
+
+ template <typename Arg>
+ static bool Convert(Arg arg, FormatConversionSpecImpl conv,
+ FormatSinkImpl* out) {
+ return arg.dispatcher_(arg.data_, conv, out);
+ }
+
+ template <typename Arg>
+ static typename Arg::Dispatcher GetVTablePtrForTest(Arg arg) {
+ return arg.dispatcher_;
+ }
+};
+
+template <typename Arg>
+constexpr FormatConversionCharSet ArgumentToConv() {
+ return absl::str_format_internal::ExtractCharSet(
+ decltype(str_format_internal::FormatConvertImpl(
+ std::declval<const Arg&>(),
+ std::declval<const FormatConversionSpecImpl&>(),
+ std::declval<FormatSinkImpl*>())){});
+}
+
+// A type-erased handle to a format argument.
+class FormatArgImpl {
+ private:
+ enum { kInlinedSpace = 8 };
+
+ using VoidPtr = str_format_internal::VoidPtr;
+
+ union Data {
+ const void* ptr;
+ const volatile void* volatile_ptr;
+ char buf[kInlinedSpace];
+ };
+
+ using Dispatcher = bool (*)(Data, FormatConversionSpecImpl, void* out);
+
+ template <typename T>
+ struct store_by_value
+ : std::integral_constant<bool, (sizeof(T) <= kInlinedSpace) &&
+ (std::is_integral<T>::value ||
+ std::is_floating_point<T>::value ||
+ std::is_pointer<T>::value ||
+ std::is_same<VoidPtr, T>::value)> {};
+
+ enum StoragePolicy { ByPointer, ByVolatilePointer, ByValue };
+ template <typename T>
+ struct storage_policy
+ : std::integral_constant<StoragePolicy,
+ (std::is_volatile<T>::value
+ ? ByVolatilePointer
+ : (store_by_value<T>::value ? ByValue
+ : ByPointer))> {
+ };
+
+ // To reduce the number of vtables we will decay values before hand.
+ // Anything with a user-defined Convert will get its own vtable.
+ // For everything else:
+ // - Decay char* and char arrays into `const char*`
+ // - Decay any other pointer to `const void*`
+ // - Decay all enums to their underlying type.
+ // - Decay function pointers to void*.
+ template <typename T, typename = void>
+ struct DecayType {
+ static constexpr bool kHasUserDefined =
+ str_format_internal::HasUserDefinedConvert<T>::value;
+ using type = typename std::conditional<
+ !kHasUserDefined && std::is_convertible<T, const char*>::value,
+ const char*,
+ typename std::conditional<!kHasUserDefined &&
+ std::is_convertible<T, VoidPtr>::value,
+ VoidPtr, const T&>::type>::type;
+ };
+ template <typename T>
+ struct DecayType<T,
+ typename std::enable_if<
+ !str_format_internal::HasUserDefinedConvert<T>::value &&
+ std::is_enum<T>::value>::type> {
+ using type = typename std::underlying_type<T>::type;
+ };
+
+ public:
+ template <typename T>
+ explicit FormatArgImpl(const T& value) {
+ using D = typename DecayType<T>::type;
+ static_assert(
+ std::is_same<D, const T&>::value || storage_policy<D>::value == ByValue,
+ "Decayed types must be stored by value");
+ Init(static_cast<D>(value));
+ }
+
+ private:
+ friend struct str_format_internal::FormatArgImplFriend;
+ template <typename T, StoragePolicy = storage_policy<T>::value>
+ struct Manager;
+
+ template <typename T>
+ struct Manager<T, ByPointer> {
+ static Data SetValue(const T& value) {
+ Data data;
+ data.ptr = std::addressof(value);
+ return data;
+ }
+
+ static const T& Value(Data arg) { return *static_cast<const T*>(arg.ptr); }
+ };
+
+ template <typename T>
+ struct Manager<T, ByVolatilePointer> {
+ static Data SetValue(const T& value) {
+ Data data;
+ data.volatile_ptr = &value;
+ return data;
+ }
+
+ static const T& Value(Data arg) {
+ return *static_cast<const T*>(arg.volatile_ptr);
+ }
+ };
+
+ template <typename T>
+ struct Manager<T, ByValue> {
+ static Data SetValue(const T& value) {
+ Data data;
+ memcpy(data.buf, &value, sizeof(value));
+ return data;
+ }
+
+ static T Value(Data arg) {
+ T value;
+ memcpy(&value, arg.buf, sizeof(T));
+ return value;
+ }
+ };
+
+ template <typename T>
+ void Init(const T& value) {
+ data_ = Manager<T>::SetValue(value);
+ dispatcher_ = &Dispatch<T>;
+ }
+
+ template <typename T>
+ static int ToIntVal(const T& val) {
+ using CommonType = typename std::conditional<std::is_signed<T>::value,
+ int64_t, uint64_t>::type;
+ if (static_cast<CommonType>(val) >
+ static_cast<CommonType>((std::numeric_limits<int>::max)())) {
+ return (std::numeric_limits<int>::max)();
+ } else if (std::is_signed<T>::value &&
+ static_cast<CommonType>(val) <
+ static_cast<CommonType>((std::numeric_limits<int>::min)())) {
+ return (std::numeric_limits<int>::min)();
+ }
+ return static_cast<int>(val);
+ }
+
+ template <typename T>
+ static bool ToInt(Data arg, int* out, std::true_type /* is_integral */,
+ std::false_type) {
+ *out = ToIntVal(Manager<T>::Value(arg));
+ return true;
+ }
+
+ template <typename T>
+ static bool ToInt(Data arg, int* out, std::false_type,
+ std::true_type /* is_enum */) {
+ *out = ToIntVal(static_cast<typename std::underlying_type<T>::type>(
+ Manager<T>::Value(arg)));
+ return true;
+ }
+
+ template <typename T>
+ static bool ToInt(Data, int*, std::false_type, std::false_type) {
+ return false;
+ }
+
+ template <typename T>
+ static bool Dispatch(Data arg, FormatConversionSpecImpl spec, void* out) {
+ // A `none` conv indicates that we want the `int` conversion.
+ if (ABSL_PREDICT_FALSE(spec.conversion_char() ==
+ FormatConversionCharInternal::kNone)) {
+ return ToInt<T>(arg, static_cast<int*>(out), std::is_integral<T>(),
+ std::is_enum<T>());
+ }
+ if (ABSL_PREDICT_FALSE(!Contains(ArgumentToConv<T>(),
+ spec.conversion_char()))) {
+ return false;
+ }
+ return str_format_internal::FormatConvertImpl(
+ Manager<T>::Value(arg), spec,
+ static_cast<FormatSinkImpl*>(out))
+ .value;
+ }
+
+ Data data_;
+ Dispatcher dispatcher_;
+};
+
+#define ABSL_INTERNAL_FORMAT_DISPATCH_INSTANTIATE_(T, E) \
+ E template bool FormatArgImpl::Dispatch<T>(Data, FormatConversionSpecImpl, \
+ void*)
+
+#define ABSL_INTERNAL_FORMAT_DISPATCH_OVERLOADS_EXPAND_(...) \
+ ABSL_INTERNAL_FORMAT_DISPATCH_INSTANTIATE_(str_format_internal::VoidPtr, \
+ __VA_ARGS__); \
+ ABSL_INTERNAL_FORMAT_DISPATCH_INSTANTIATE_(bool, __VA_ARGS__); \
+ ABSL_INTERNAL_FORMAT_DISPATCH_INSTANTIATE_(char, __VA_ARGS__); \
+ ABSL_INTERNAL_FORMAT_DISPATCH_INSTANTIATE_(signed char, __VA_ARGS__); \
+ ABSL_INTERNAL_FORMAT_DISPATCH_INSTANTIATE_(unsigned char, __VA_ARGS__); \
+ ABSL_INTERNAL_FORMAT_DISPATCH_INSTANTIATE_(short, __VA_ARGS__); /* NOLINT */ \
+ ABSL_INTERNAL_FORMAT_DISPATCH_INSTANTIATE_(unsigned short, /* NOLINT */ \
+ __VA_ARGS__); \
+ ABSL_INTERNAL_FORMAT_DISPATCH_INSTANTIATE_(int, __VA_ARGS__); \
+ ABSL_INTERNAL_FORMAT_DISPATCH_INSTANTIATE_(unsigned int, __VA_ARGS__); \
+ ABSL_INTERNAL_FORMAT_DISPATCH_INSTANTIATE_(long, __VA_ARGS__); /* NOLINT */ \
+ ABSL_INTERNAL_FORMAT_DISPATCH_INSTANTIATE_(unsigned long, /* NOLINT */ \
+ __VA_ARGS__); \
+ ABSL_INTERNAL_FORMAT_DISPATCH_INSTANTIATE_(long long, /* NOLINT */ \
+ __VA_ARGS__); \
+ ABSL_INTERNAL_FORMAT_DISPATCH_INSTANTIATE_(unsigned long long, /* NOLINT */ \
+ __VA_ARGS__); \
+ ABSL_INTERNAL_FORMAT_DISPATCH_INSTANTIATE_(int128, __VA_ARGS__); \
+ ABSL_INTERNAL_FORMAT_DISPATCH_INSTANTIATE_(uint128, __VA_ARGS__); \
+ ABSL_INTERNAL_FORMAT_DISPATCH_INSTANTIATE_(float, __VA_ARGS__); \
+ ABSL_INTERNAL_FORMAT_DISPATCH_INSTANTIATE_(double, __VA_ARGS__); \
+ ABSL_INTERNAL_FORMAT_DISPATCH_INSTANTIATE_(long double, __VA_ARGS__); \
+ ABSL_INTERNAL_FORMAT_DISPATCH_INSTANTIATE_(const char*, __VA_ARGS__); \
+ ABSL_INTERNAL_FORMAT_DISPATCH_INSTANTIATE_(std::string, __VA_ARGS__); \
+ ABSL_INTERNAL_FORMAT_DISPATCH_INSTANTIATE_(string_view, __VA_ARGS__)
+
+ABSL_INTERNAL_FORMAT_DISPATCH_OVERLOADS_EXPAND_(extern);
+
+
+} // namespace str_format_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_STRINGS_INTERNAL_STR_FORMAT_ARG_H_
diff --git a/third_party/abseil/src/absl/strings/internal/str_format/arg_test.cc b/third_party/abseil/src/absl/strings/internal/str_format/arg_test.cc
new file mode 100644
index 0000000..1261937
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/internal/str_format/arg_test.cc
@@ -0,0 +1,130 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/strings/internal/str_format/arg.h"
+
+#include <ostream>
+#include <string>
+#include "gtest/gtest.h"
+#include "absl/strings/str_format.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace str_format_internal {
+namespace {
+
+class FormatArgImplTest : public ::testing::Test {
+ public:
+ enum Color { kRed, kGreen, kBlue };
+
+ static const char *hi() { return "hi"; }
+
+ struct X {};
+
+ X x_;
+};
+
+inline FormatConvertResult<FormatConversionCharSet{}> AbslFormatConvert(
+ const FormatArgImplTest::X &, const FormatConversionSpec &, FormatSink *) {
+ return {false};
+}
+
+TEST_F(FormatArgImplTest, ToInt) {
+ int out = 0;
+ EXPECT_TRUE(FormatArgImplFriend::ToInt(FormatArgImpl(1), &out));
+ EXPECT_EQ(1, out);
+ EXPECT_TRUE(FormatArgImplFriend::ToInt(FormatArgImpl(-1), &out));
+ EXPECT_EQ(-1, out);
+ EXPECT_TRUE(
+ FormatArgImplFriend::ToInt(FormatArgImpl(static_cast<char>(64)), &out));
+ EXPECT_EQ(64, out);
+ EXPECT_TRUE(FormatArgImplFriend::ToInt(
+ FormatArgImpl(static_cast<unsigned long long>(123456)), &out)); // NOLINT
+ EXPECT_EQ(123456, out);
+ EXPECT_TRUE(FormatArgImplFriend::ToInt(
+ FormatArgImpl(static_cast<unsigned long long>( // NOLINT
+ std::numeric_limits<int>::max()) +
+ 1),
+ &out));
+ EXPECT_EQ(std::numeric_limits<int>::max(), out);
+ EXPECT_TRUE(FormatArgImplFriend::ToInt(
+ FormatArgImpl(static_cast<long long>( // NOLINT
+ std::numeric_limits<int>::min()) -
+ 10),
+ &out));
+ EXPECT_EQ(std::numeric_limits<int>::min(), out);
+ EXPECT_TRUE(FormatArgImplFriend::ToInt(FormatArgImpl(false), &out));
+ EXPECT_EQ(0, out);
+ EXPECT_TRUE(FormatArgImplFriend::ToInt(FormatArgImpl(true), &out));
+ EXPECT_EQ(1, out);
+ EXPECT_FALSE(FormatArgImplFriend::ToInt(FormatArgImpl(2.2), &out));
+ EXPECT_FALSE(FormatArgImplFriend::ToInt(FormatArgImpl(3.2f), &out));
+ EXPECT_FALSE(FormatArgImplFriend::ToInt(
+ FormatArgImpl(static_cast<int *>(nullptr)), &out));
+ EXPECT_FALSE(FormatArgImplFriend::ToInt(FormatArgImpl(hi()), &out));
+ EXPECT_FALSE(FormatArgImplFriend::ToInt(FormatArgImpl("hi"), &out));
+ EXPECT_FALSE(FormatArgImplFriend::ToInt(FormatArgImpl(x_), &out));
+ EXPECT_TRUE(FormatArgImplFriend::ToInt(FormatArgImpl(kBlue), &out));
+ EXPECT_EQ(2, out);
+}
+
+extern const char kMyArray[];
+
+TEST_F(FormatArgImplTest, CharArraysDecayToCharPtr) {
+ const char* a = "";
+ EXPECT_EQ(FormatArgImplFriend::GetVTablePtrForTest(FormatArgImpl(a)),
+ FormatArgImplFriend::GetVTablePtrForTest(FormatArgImpl("")));
+ EXPECT_EQ(FormatArgImplFriend::GetVTablePtrForTest(FormatArgImpl(a)),
+ FormatArgImplFriend::GetVTablePtrForTest(FormatArgImpl("A")));
+ EXPECT_EQ(FormatArgImplFriend::GetVTablePtrForTest(FormatArgImpl(a)),
+ FormatArgImplFriend::GetVTablePtrForTest(FormatArgImpl("ABC")));
+ EXPECT_EQ(FormatArgImplFriend::GetVTablePtrForTest(FormatArgImpl(a)),
+ FormatArgImplFriend::GetVTablePtrForTest(FormatArgImpl(kMyArray)));
+}
+
+TEST_F(FormatArgImplTest, OtherPtrDecayToVoidPtr) {
+ auto expected = FormatArgImplFriend::GetVTablePtrForTest(
+ FormatArgImpl(static_cast<void *>(nullptr)));
+ EXPECT_EQ(FormatArgImplFriend::GetVTablePtrForTest(
+ FormatArgImpl(static_cast<int *>(nullptr))),
+ expected);
+ EXPECT_EQ(FormatArgImplFriend::GetVTablePtrForTest(
+ FormatArgImpl(static_cast<volatile int *>(nullptr))),
+ expected);
+
+ auto p = static_cast<void (*)()>([] {});
+ EXPECT_EQ(FormatArgImplFriend::GetVTablePtrForTest(FormatArgImpl(p)),
+ expected);
+}
+
+TEST_F(FormatArgImplTest, WorksWithCharArraysOfUnknownSize) {
+ std::string s;
+ FormatSinkImpl sink(&s);
+ FormatConversionSpecImpl conv;
+ FormatConversionSpecImplFriend::SetConversionChar(
+ FormatConversionCharInternal::s, &conv);
+ FormatConversionSpecImplFriend::SetFlags(Flags(), &conv);
+ FormatConversionSpecImplFriend::SetWidth(-1, &conv);
+ FormatConversionSpecImplFriend::SetPrecision(-1, &conv);
+ EXPECT_TRUE(
+ FormatArgImplFriend::Convert(FormatArgImpl(kMyArray), conv, &sink));
+ sink.Flush();
+ EXPECT_EQ("ABCDE", s);
+}
+const char kMyArray[] = "ABCDE";
+
+} // namespace
+} // namespace str_format_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/strings/internal/str_format/bind.cc b/third_party/abseil/src/absl/strings/internal/str_format/bind.cc
new file mode 100644
index 0000000..4e68b90
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/internal/str_format/bind.cc
@@ -0,0 +1,259 @@
+// Copyright 2020 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/strings/internal/str_format/bind.h"
+
+#include <cerrno>
+#include <limits>
+#include <sstream>
+#include <string>
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace str_format_internal {
+
+namespace {
+
+inline bool BindFromPosition(int position, int* value,
+ absl::Span<const FormatArgImpl> pack) {
+ assert(position > 0);
+ if (static_cast<size_t>(position) > pack.size()) {
+ return false;
+ }
+ // -1 because positions are 1-based
+ return FormatArgImplFriend::ToInt(pack[position - 1], value);
+}
+
+class ArgContext {
+ public:
+ explicit ArgContext(absl::Span<const FormatArgImpl> pack) : pack_(pack) {}
+
+ // Fill 'bound' with the results of applying the context's argument pack
+ // to the specified 'unbound'. We synthesize a BoundConversion by
+ // lining up a UnboundConversion with a user argument. We also
+ // resolve any '*' specifiers for width and precision, so after
+ // this call, 'bound' has all the information it needs to be formatted.
+ // Returns false on failure.
+ bool Bind(const UnboundConversion* unbound, BoundConversion* bound);
+
+ private:
+ absl::Span<const FormatArgImpl> pack_;
+};
+
+inline bool ArgContext::Bind(const UnboundConversion* unbound,
+ BoundConversion* bound) {
+ const FormatArgImpl* arg = nullptr;
+ int arg_position = unbound->arg_position;
+ if (static_cast<size_t>(arg_position - 1) >= pack_.size()) return false;
+ arg = &pack_[arg_position - 1]; // 1-based
+
+ if (!unbound->flags.basic) {
+ int width = unbound->width.value();
+ bool force_left = false;
+ if (unbound->width.is_from_arg()) {
+ if (!BindFromPosition(unbound->width.get_from_arg(), &width, pack_))
+ return false;
+ if (width < 0) {
+ // "A negative field width is taken as a '-' flag followed by a
+ // positive field width."
+ force_left = true;
+ // Make sure we don't overflow the width when negating it.
+ width = -std::max(width, -std::numeric_limits<int>::max());
+ }
+ }
+
+ int precision = unbound->precision.value();
+ if (unbound->precision.is_from_arg()) {
+ if (!BindFromPosition(unbound->precision.get_from_arg(), &precision,
+ pack_))
+ return false;
+ }
+
+ FormatConversionSpecImplFriend::SetWidth(width, bound);
+ FormatConversionSpecImplFriend::SetPrecision(precision, bound);
+
+ if (force_left) {
+ Flags flags = unbound->flags;
+ flags.left = true;
+ FormatConversionSpecImplFriend::SetFlags(flags, bound);
+ } else {
+ FormatConversionSpecImplFriend::SetFlags(unbound->flags, bound);
+ }
+ } else {
+ FormatConversionSpecImplFriend::SetFlags(unbound->flags, bound);
+ FormatConversionSpecImplFriend::SetWidth(-1, bound);
+ FormatConversionSpecImplFriend::SetPrecision(-1, bound);
+ }
+ FormatConversionSpecImplFriend::SetConversionChar(unbound->conv, bound);
+ bound->set_arg(arg);
+ return true;
+}
+
+template <typename Converter>
+class ConverterConsumer {
+ public:
+ ConverterConsumer(Converter converter, absl::Span<const FormatArgImpl> pack)
+ : converter_(converter), arg_context_(pack) {}
+
+ bool Append(string_view s) {
+ converter_.Append(s);
+ return true;
+ }
+ bool ConvertOne(const UnboundConversion& conv, string_view conv_string) {
+ BoundConversion bound;
+ if (!arg_context_.Bind(&conv, &bound)) return false;
+ return converter_.ConvertOne(bound, conv_string);
+ }
+
+ private:
+ Converter converter_;
+ ArgContext arg_context_;
+};
+
+template <typename Converter>
+bool ConvertAll(const UntypedFormatSpecImpl format,
+ absl::Span<const FormatArgImpl> args, Converter converter) {
+ if (format.has_parsed_conversion()) {
+ return format.parsed_conversion()->ProcessFormat(
+ ConverterConsumer<Converter>(converter, args));
+ } else {
+ return ParseFormatString(format.str(),
+ ConverterConsumer<Converter>(converter, args));
+ }
+}
+
+class DefaultConverter {
+ public:
+ explicit DefaultConverter(FormatSinkImpl* sink) : sink_(sink) {}
+
+ void Append(string_view s) const { sink_->Append(s); }
+
+ bool ConvertOne(const BoundConversion& bound, string_view /*conv*/) const {
+ return FormatArgImplFriend::Convert(*bound.arg(), bound, sink_);
+ }
+
+ private:
+ FormatSinkImpl* sink_;
+};
+
+class SummarizingConverter {
+ public:
+ explicit SummarizingConverter(FormatSinkImpl* sink) : sink_(sink) {}
+
+ void Append(string_view s) const { sink_->Append(s); }
+
+ bool ConvertOne(const BoundConversion& bound, string_view /*conv*/) const {
+ UntypedFormatSpecImpl spec("%d");
+
+ std::ostringstream ss;
+ ss << "{" << Streamable(spec, {*bound.arg()}) << ":"
+ << FormatConversionSpecImplFriend::FlagsToString(bound);
+ if (bound.width() >= 0) ss << bound.width();
+ if (bound.precision() >= 0) ss << "." << bound.precision();
+ ss << bound.conversion_char() << "}";
+ Append(ss.str());
+ return true;
+ }
+
+ private:
+ FormatSinkImpl* sink_;
+};
+
+} // namespace
+
+bool BindWithPack(const UnboundConversion* props,
+ absl::Span<const FormatArgImpl> pack,
+ BoundConversion* bound) {
+ return ArgContext(pack).Bind(props, bound);
+}
+
+std::string Summarize(const UntypedFormatSpecImpl format,
+ absl::Span<const FormatArgImpl> args) {
+ typedef SummarizingConverter Converter;
+ std::string out;
+ {
+ // inner block to destroy sink before returning out. It ensures a last
+ // flush.
+ FormatSinkImpl sink(&out);
+ if (!ConvertAll(format, args, Converter(&sink))) {
+ return "";
+ }
+ }
+ return out;
+}
+
+bool FormatUntyped(FormatRawSinkImpl raw_sink,
+ const UntypedFormatSpecImpl format,
+ absl::Span<const FormatArgImpl> args) {
+ FormatSinkImpl sink(raw_sink);
+ using Converter = DefaultConverter;
+ return ConvertAll(format, args, Converter(&sink));
+}
+
+std::ostream& Streamable::Print(std::ostream& os) const {
+ if (!FormatUntyped(&os, format_, args_)) os.setstate(std::ios::failbit);
+ return os;
+}
+
+std::string& AppendPack(std::string* out, const UntypedFormatSpecImpl format,
+ absl::Span<const FormatArgImpl> args) {
+ size_t orig = out->size();
+ if (ABSL_PREDICT_FALSE(!FormatUntyped(out, format, args))) {
+ out->erase(orig);
+ }
+ return *out;
+}
+
+std::string FormatPack(const UntypedFormatSpecImpl format,
+ absl::Span<const FormatArgImpl> args) {
+ std::string out;
+ if (ABSL_PREDICT_FALSE(!FormatUntyped(&out, format, args))) {
+ out.clear();
+ }
+ return out;
+}
+
+int FprintF(std::FILE* output, const UntypedFormatSpecImpl format,
+ absl::Span<const FormatArgImpl> args) {
+ FILERawSink sink(output);
+ if (!FormatUntyped(&sink, format, args)) {
+ errno = EINVAL;
+ return -1;
+ }
+ if (sink.error()) {
+ errno = sink.error();
+ return -1;
+ }
+ if (sink.count() > static_cast<size_t>(std::numeric_limits<int>::max())) {
+ errno = EFBIG;
+ return -1;
+ }
+ return static_cast<int>(sink.count());
+}
+
+int SnprintF(char* output, size_t size, const UntypedFormatSpecImpl format,
+ absl::Span<const FormatArgImpl> args) {
+ BufferRawSink sink(output, size ? size - 1 : 0);
+ if (!FormatUntyped(&sink, format, args)) {
+ errno = EINVAL;
+ return -1;
+ }
+ size_t total = sink.total_written();
+ if (size) output[std::min(total, size - 1)] = 0;
+ return static_cast<int>(total);
+}
+
+} // namespace str_format_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/strings/internal/str_format/bind.h b/third_party/abseil/src/absl/strings/internal/str_format/bind.h
new file mode 100644
index 0000000..267cc0e
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/internal/str_format/bind.h
@@ -0,0 +1,217 @@
+// Copyright 2020 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_STRINGS_INTERNAL_STR_FORMAT_BIND_H_
+#define ABSL_STRINGS_INTERNAL_STR_FORMAT_BIND_H_
+
+#include <array>
+#include <cstdio>
+#include <sstream>
+#include <string>
+
+#include "absl/base/port.h"
+#include "absl/strings/internal/str_format/arg.h"
+#include "absl/strings/internal/str_format/checker.h"
+#include "absl/strings/internal/str_format/parser.h"
+#include "absl/types/span.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+class UntypedFormatSpec;
+
+namespace str_format_internal {
+
+class BoundConversion : public FormatConversionSpecImpl {
+ public:
+ const FormatArgImpl* arg() const { return arg_; }
+ void set_arg(const FormatArgImpl* a) { arg_ = a; }
+
+ private:
+ const FormatArgImpl* arg_;
+};
+
+// This is the type-erased class that the implementation uses.
+class UntypedFormatSpecImpl {
+ public:
+ UntypedFormatSpecImpl() = delete;
+
+ explicit UntypedFormatSpecImpl(string_view s)
+ : data_(s.data()), size_(s.size()) {}
+ explicit UntypedFormatSpecImpl(
+ const str_format_internal::ParsedFormatBase* pc)
+ : data_(pc), size_(~size_t{}) {}
+
+ bool has_parsed_conversion() const { return size_ == ~size_t{}; }
+
+ string_view str() const {
+ assert(!has_parsed_conversion());
+ return string_view(static_cast<const char*>(data_), size_);
+ }
+ const str_format_internal::ParsedFormatBase* parsed_conversion() const {
+ assert(has_parsed_conversion());
+ return static_cast<const str_format_internal::ParsedFormatBase*>(data_);
+ }
+
+ template <typename T>
+ static const UntypedFormatSpecImpl& Extract(const T& s) {
+ return s.spec_;
+ }
+
+ private:
+ const void* data_;
+ size_t size_;
+};
+
+template <typename T, FormatConversionCharSet...>
+struct MakeDependent {
+ using type = T;
+};
+
+// Implicitly convertible from `const char*`, `string_view`, and the
+// `ExtendedParsedFormat` type. This abstraction allows all format functions to
+// operate on any without providing too many overloads.
+template <FormatConversionCharSet... Args>
+class FormatSpecTemplate
+ : public MakeDependent<UntypedFormatSpec, Args...>::type {
+ using Base = typename MakeDependent<UntypedFormatSpec, Args...>::type;
+
+ public:
+#ifdef ABSL_INTERNAL_ENABLE_FORMAT_CHECKER
+
+ // Honeypot overload for when the string is not constexpr.
+ // We use the 'unavailable' attribute to give a better compiler error than
+ // just 'method is deleted'.
+ FormatSpecTemplate(...) // NOLINT
+ __attribute__((unavailable("Format string is not constexpr.")));
+
+ // Honeypot overload for when the format is constexpr and invalid.
+ // We use the 'unavailable' attribute to give a better compiler error than
+ // just 'method is deleted'.
+ // To avoid checking the format twice, we just check that the format is
+ // constexpr. If is it valid, then the overload below will kick in.
+ // We add the template here to make this overload have lower priority.
+ template <typename = void>
+ FormatSpecTemplate(const char* s) // NOLINT
+ __attribute__((
+ enable_if(str_format_internal::EnsureConstexpr(s), "constexpr trap"),
+ unavailable(
+ "Format specified does not match the arguments passed.")));
+
+ template <typename T = void>
+ FormatSpecTemplate(string_view s) // NOLINT
+ __attribute__((enable_if(str_format_internal::EnsureConstexpr(s),
+ "constexpr trap"))) {
+ static_assert(sizeof(T*) == 0,
+ "Format specified does not match the arguments passed.");
+ }
+
+ // Good format overload.
+ FormatSpecTemplate(const char* s) // NOLINT
+ __attribute__((enable_if(ValidFormatImpl<Args...>(s), "bad format trap")))
+ : Base(s) {}
+
+ FormatSpecTemplate(string_view s) // NOLINT
+ __attribute__((enable_if(ValidFormatImpl<Args...>(s), "bad format trap")))
+ : Base(s) {}
+
+#else // ABSL_INTERNAL_ENABLE_FORMAT_CHECKER
+
+ FormatSpecTemplate(const char* s) : Base(s) {} // NOLINT
+ FormatSpecTemplate(string_view s) : Base(s) {} // NOLINT
+
+#endif // ABSL_INTERNAL_ENABLE_FORMAT_CHECKER
+
+ template <
+ FormatConversionCharSet... C,
+ typename = typename std::enable_if<sizeof...(C) == sizeof...(Args)>::type,
+ typename = typename std::enable_if<AllOf(Contains(Args,
+ C)...)>::type>
+ FormatSpecTemplate(const ExtendedParsedFormat<C...>& pc) // NOLINT
+ : Base(&pc) {}
+};
+
+class Streamable {
+ public:
+ Streamable(const UntypedFormatSpecImpl& format,
+ absl::Span<const FormatArgImpl> args)
+ : format_(format) {
+ if (args.size() <= ABSL_ARRAYSIZE(few_args_)) {
+ for (size_t i = 0; i < args.size(); ++i) {
+ few_args_[i] = args[i];
+ }
+ args_ = absl::MakeSpan(few_args_, args.size());
+ } else {
+ many_args_.assign(args.begin(), args.end());
+ args_ = many_args_;
+ }
+ }
+
+ std::ostream& Print(std::ostream& os) const;
+
+ friend std::ostream& operator<<(std::ostream& os, const Streamable& l) {
+ return l.Print(os);
+ }
+
+ private:
+ const UntypedFormatSpecImpl& format_;
+ absl::Span<const FormatArgImpl> args_;
+ // if args_.size() is 4 or less:
+ FormatArgImpl few_args_[4] = {FormatArgImpl(0), FormatArgImpl(0),
+ FormatArgImpl(0), FormatArgImpl(0)};
+ // if args_.size() is more than 4:
+ std::vector<FormatArgImpl> many_args_;
+};
+
+// for testing
+std::string Summarize(UntypedFormatSpecImpl format,
+ absl::Span<const FormatArgImpl> args);
+bool BindWithPack(const UnboundConversion* props,
+ absl::Span<const FormatArgImpl> pack, BoundConversion* bound);
+
+bool FormatUntyped(FormatRawSinkImpl raw_sink,
+ UntypedFormatSpecImpl format,
+ absl::Span<const FormatArgImpl> args);
+
+std::string& AppendPack(std::string* out, UntypedFormatSpecImpl format,
+ absl::Span<const FormatArgImpl> args);
+
+std::string FormatPack(const UntypedFormatSpecImpl format,
+ absl::Span<const FormatArgImpl> args);
+
+int FprintF(std::FILE* output, UntypedFormatSpecImpl format,
+ absl::Span<const FormatArgImpl> args);
+int SnprintF(char* output, size_t size, UntypedFormatSpecImpl format,
+ absl::Span<const FormatArgImpl> args);
+
+// Returned by Streamed(v). Converts via '%s' to the std::string created
+// by std::ostream << v.
+template <typename T>
+class StreamedWrapper {
+ public:
+ explicit StreamedWrapper(const T& v) : v_(v) { }
+
+ private:
+ template <typename S>
+ friend ArgConvertResult<FormatConversionCharSetInternal::s> FormatConvertImpl(
+ const StreamedWrapper<S>& v, FormatConversionSpecImpl conv,
+ FormatSinkImpl* out);
+ const T& v_;
+};
+
+} // namespace str_format_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_STRINGS_INTERNAL_STR_FORMAT_BIND_H_
diff --git a/third_party/abseil/src/absl/strings/internal/str_format/bind_test.cc b/third_party/abseil/src/absl/strings/internal/str_format/bind_test.cc
new file mode 100644
index 0000000..1eef9c4
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/internal/str_format/bind_test.cc
@@ -0,0 +1,157 @@
+// Copyright 2020 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/strings/internal/str_format/bind.h"
+
+#include <string.h>
+#include <limits>
+
+#include "gtest/gtest.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace str_format_internal {
+namespace {
+
+class FormatBindTest : public ::testing::Test {
+ public:
+ bool Extract(const char *s, UnboundConversion *props, int *next) const {
+ return ConsumeUnboundConversion(s, s + strlen(s), props, next) ==
+ s + strlen(s);
+ }
+};
+
+TEST_F(FormatBindTest, BindSingle) {
+ struct Expectation {
+ int line;
+ const char *fmt;
+ int ok_phases;
+ const FormatArgImpl *arg;
+ int width;
+ int precision;
+ int next_arg;
+ };
+ const int no = -1;
+ const int ia[] = { 10, 20, 30, 40};
+ const FormatArgImpl args[] = {FormatArgImpl(ia[0]), FormatArgImpl(ia[1]),
+ FormatArgImpl(ia[2]), FormatArgImpl(ia[3])};
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wmissing-field-initializers"
+ const Expectation kExpect[] = {
+ {__LINE__, "d", 2, &args[0], no, no, 2},
+ {__LINE__, "4d", 2, &args[0], 4, no, 2},
+ {__LINE__, ".5d", 2, &args[0], no, 5, 2},
+ {__LINE__, "4.5d", 2, &args[0], 4, 5, 2},
+ {__LINE__, "*d", 2, &args[1], 10, no, 3},
+ {__LINE__, ".*d", 2, &args[1], no, 10, 3},
+ {__LINE__, "*.*d", 2, &args[2], 10, 20, 4},
+ {__LINE__, "1$d", 2, &args[0], no, no, 0},
+ {__LINE__, "2$d", 2, &args[1], no, no, 0},
+ {__LINE__, "3$d", 2, &args[2], no, no, 0},
+ {__LINE__, "4$d", 2, &args[3], no, no, 0},
+ {__LINE__, "2$*1$d", 2, &args[1], 10, no, 0},
+ {__LINE__, "2$*2$d", 2, &args[1], 20, no, 0},
+ {__LINE__, "2$*3$d", 2, &args[1], 30, no, 0},
+ {__LINE__, "2$.*1$d", 2, &args[1], no, 10, 0},
+ {__LINE__, "2$.*2$d", 2, &args[1], no, 20, 0},
+ {__LINE__, "2$.*3$d", 2, &args[1], no, 30, 0},
+ {__LINE__, "2$*3$.*1$d", 2, &args[1], 30, 10, 0},
+ {__LINE__, "2$*2$.*2$d", 2, &args[1], 20, 20, 0},
+ {__LINE__, "2$*1$.*3$d", 2, &args[1], 10, 30, 0},
+ {__LINE__, "2$*3$.*1$d", 2, &args[1], 30, 10, 0},
+ {__LINE__, "1$*d", 0}, // indexed, then positional
+ {__LINE__, "*2$d", 0}, // positional, then indexed
+ {__LINE__, "6$d", 1}, // arg position out of bounds
+ {__LINE__, "1$6$d", 0}, // width position incorrectly specified
+ {__LINE__, "1$.6$d", 0}, // precision position incorrectly specified
+ {__LINE__, "1$*6$d", 1}, // width position out of bounds
+ {__LINE__, "1$.*6$d", 1}, // precision position out of bounds
+ };
+#pragma GCC diagnostic pop
+ for (const Expectation &e : kExpect) {
+ SCOPED_TRACE(e.line);
+ SCOPED_TRACE(e.fmt);
+ UnboundConversion props;
+ BoundConversion bound;
+ int ok_phases = 0;
+ int next = 0;
+ if (Extract(e.fmt, &props, &next)) {
+ ++ok_phases;
+ if (BindWithPack(&props, args, &bound)) {
+ ++ok_phases;
+ }
+ }
+ EXPECT_EQ(e.ok_phases, ok_phases);
+ if (e.ok_phases < 2) continue;
+ if (e.arg != nullptr) {
+ EXPECT_EQ(e.arg, bound.arg());
+ }
+ EXPECT_EQ(e.width, bound.width());
+ EXPECT_EQ(e.precision, bound.precision());
+ }
+}
+
+TEST_F(FormatBindTest, WidthUnderflowRegression) {
+ UnboundConversion props;
+ BoundConversion bound;
+ int next = 0;
+ const int args_i[] = {std::numeric_limits<int>::min(), 17};
+ const FormatArgImpl args[] = {FormatArgImpl(args_i[0]),
+ FormatArgImpl(args_i[1])};
+ ASSERT_TRUE(Extract("*d", &props, &next));
+ ASSERT_TRUE(BindWithPack(&props, args, &bound));
+
+ EXPECT_EQ(bound.width(), std::numeric_limits<int>::max());
+ EXPECT_EQ(bound.arg(), args + 1);
+}
+
+TEST_F(FormatBindTest, FormatPack) {
+ struct Expectation {
+ int line;
+ const char *fmt;
+ const char *summary;
+ };
+ const int ia[] = { 10, 20, 30, 40, -10 };
+ const FormatArgImpl args[] = {FormatArgImpl(ia[0]), FormatArgImpl(ia[1]),
+ FormatArgImpl(ia[2]), FormatArgImpl(ia[3]),
+ FormatArgImpl(ia[4])};
+ const Expectation kExpect[] = {
+ {__LINE__, "a%4db%dc", "a{10:4d}b{20:d}c"},
+ {__LINE__, "a%.4db%dc", "a{10:.4d}b{20:d}c"},
+ {__LINE__, "a%4.5db%dc", "a{10:4.5d}b{20:d}c"},
+ {__LINE__, "a%db%4.5dc", "a{10:d}b{20:4.5d}c"},
+ {__LINE__, "a%db%*.*dc", "a{10:d}b{40:20.30d}c"},
+ {__LINE__, "a%.*fb", "a{20:.10f}b"},
+ {__LINE__, "a%1$db%2$*3$.*4$dc", "a{10:d}b{20:30.40d}c"},
+ {__LINE__, "a%4$db%3$*2$.*1$dc", "a{40:d}b{30:20.10d}c"},
+ {__LINE__, "a%04ldb", "a{10:04d}b"},
+ {__LINE__, "a%-#04lldb", "a{10:-#04d}b"},
+ {__LINE__, "a%1$*5$db", "a{10:-10d}b"},
+ {__LINE__, "a%1$.*5$db", "a{10:d}b"},
+ };
+ for (const Expectation &e : kExpect) {
+ absl::string_view fmt = e.fmt;
+ SCOPED_TRACE(e.line);
+ SCOPED_TRACE(e.fmt);
+ UntypedFormatSpecImpl format(fmt);
+ EXPECT_EQ(e.summary,
+ str_format_internal::Summarize(format, absl::MakeSpan(args)))
+ << "line:" << e.line;
+ }
+}
+
+} // namespace
+} // namespace str_format_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/strings/internal/str_format/checker.h b/third_party/abseil/src/absl/strings/internal/str_format/checker.h
new file mode 100644
index 0000000..2a2601e
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/internal/str_format/checker.h
@@ -0,0 +1,333 @@
+// Copyright 2020 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_STRINGS_INTERNAL_STR_FORMAT_CHECKER_H_
+#define ABSL_STRINGS_INTERNAL_STR_FORMAT_CHECKER_H_
+
+#include "absl/base/attributes.h"
+#include "absl/strings/internal/str_format/arg.h"
+#include "absl/strings/internal/str_format/extension.h"
+
+// Compile time check support for entry points.
+
+#ifndef ABSL_INTERNAL_ENABLE_FORMAT_CHECKER
+#if ABSL_HAVE_ATTRIBUTE(enable_if) && !defined(__native_client__)
+#define ABSL_INTERNAL_ENABLE_FORMAT_CHECKER 1
+#endif // ABSL_HAVE_ATTRIBUTE(enable_if) && !defined(__native_client__)
+#endif // ABSL_INTERNAL_ENABLE_FORMAT_CHECKER
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace str_format_internal {
+
+constexpr bool AllOf() { return true; }
+
+template <typename... T>
+constexpr bool AllOf(bool b, T... t) {
+ return b && AllOf(t...);
+}
+
+#ifdef ABSL_INTERNAL_ENABLE_FORMAT_CHECKER
+
+constexpr bool ContainsChar(const char* chars, char c) {
+ return *chars == c || (*chars && ContainsChar(chars + 1, c));
+}
+
+// A constexpr compatible list of Convs.
+struct ConvList {
+ const FormatConversionCharSet* array;
+ int count;
+
+ // We do the bound check here to avoid having to do it on the callers.
+ // Returning an empty FormatConversionCharSet has the same effect as
+ // short circuiting because it will never match any conversion.
+ constexpr FormatConversionCharSet operator[](int i) const {
+ return i < count ? array[i] : FormatConversionCharSet{};
+ }
+
+ constexpr ConvList without_front() const {
+ return count != 0 ? ConvList{array + 1, count - 1} : *this;
+ }
+};
+
+template <size_t count>
+struct ConvListT {
+ // Make sure the array has size > 0.
+ FormatConversionCharSet list[count ? count : 1];
+};
+
+constexpr char GetChar(string_view str, size_t index) {
+ return index < str.size() ? str[index] : char{};
+}
+
+constexpr string_view ConsumeFront(string_view str, size_t len = 1) {
+ return len <= str.size() ? string_view(str.data() + len, str.size() - len)
+ : string_view();
+}
+
+constexpr string_view ConsumeAnyOf(string_view format, const char* chars) {
+ return ContainsChar(chars, GetChar(format, 0))
+ ? ConsumeAnyOf(ConsumeFront(format), chars)
+ : format;
+}
+
+constexpr bool IsDigit(char c) { return c >= '0' && c <= '9'; }
+
+// Helper class for the ParseDigits function.
+// It encapsulates the two return values we need there.
+struct Integer {
+ string_view format;
+ int value;
+
+ // If the next character is a '$', consume it.
+ // Otherwise, make `this` an invalid positional argument.
+ constexpr Integer ConsumePositionalDollar() const {
+ return GetChar(format, 0) == '$' ? Integer{ConsumeFront(format), value}
+ : Integer{format, 0};
+ }
+};
+
+constexpr Integer ParseDigits(string_view format, int value = 0) {
+ return IsDigit(GetChar(format, 0))
+ ? ParseDigits(ConsumeFront(format),
+ 10 * value + GetChar(format, 0) - '0')
+ : Integer{format, value};
+}
+
+// Parse digits for a positional argument.
+// The parsing also consumes the '$'.
+constexpr Integer ParsePositional(string_view format) {
+ return ParseDigits(format).ConsumePositionalDollar();
+}
+
+// Parses a single conversion specifier.
+// See ConvParser::Run() for post conditions.
+class ConvParser {
+ constexpr ConvParser SetFormat(string_view format) const {
+ return ConvParser(format, args_, error_, arg_position_, is_positional_);
+ }
+
+ constexpr ConvParser SetArgs(ConvList args) const {
+ return ConvParser(format_, args, error_, arg_position_, is_positional_);
+ }
+
+ constexpr ConvParser SetError(bool error) const {
+ return ConvParser(format_, args_, error_ || error, arg_position_,
+ is_positional_);
+ }
+
+ constexpr ConvParser SetArgPosition(int arg_position) const {
+ return ConvParser(format_, args_, error_, arg_position, is_positional_);
+ }
+
+ // Consumes the next arg and verifies that it matches `conv`.
+ // `error_` is set if there is no next arg or if it doesn't match `conv`.
+ constexpr ConvParser ConsumeNextArg(char conv) const {
+ return SetArgs(args_.without_front()).SetError(!Contains(args_[0], conv));
+ }
+
+ // Verify that positional argument `i.value` matches `conv`.
+ // `error_` is set if `i.value` is not a valid argument or if it doesn't
+ // match.
+ constexpr ConvParser VerifyPositional(Integer i, char conv) const {
+ return SetFormat(i.format).SetError(!Contains(args_[i.value - 1], conv));
+ }
+
+ // Parse the position of the arg and store it in `arg_position_`.
+ constexpr ConvParser ParseArgPosition(Integer arg) const {
+ return SetFormat(arg.format).SetArgPosition(arg.value);
+ }
+
+ // Consume the flags.
+ constexpr ConvParser ParseFlags() const {
+ return SetFormat(ConsumeAnyOf(format_, "-+ #0"));
+ }
+
+ // Consume the width.
+ // If it is '*', we verify that it matches `args_`. `error_` is set if it
+ // doesn't match.
+ constexpr ConvParser ParseWidth() const {
+ return IsDigit(GetChar(format_, 0))
+ ? SetFormat(ParseDigits(format_).format)
+ : GetChar(format_, 0) == '*'
+ ? is_positional_
+ ? VerifyPositional(
+ ParsePositional(ConsumeFront(format_)), '*')
+ : SetFormat(ConsumeFront(format_))
+ .ConsumeNextArg('*')
+ : *this;
+ }
+
+ // Consume the precision.
+ // If it is '*', we verify that it matches `args_`. `error_` is set if it
+ // doesn't match.
+ constexpr ConvParser ParsePrecision() const {
+ return GetChar(format_, 0) != '.'
+ ? *this
+ : GetChar(format_, 1) == '*'
+ ? is_positional_
+ ? VerifyPositional(
+ ParsePositional(ConsumeFront(format_, 2)), '*')
+ : SetFormat(ConsumeFront(format_, 2))
+ .ConsumeNextArg('*')
+ : SetFormat(ParseDigits(ConsumeFront(format_)).format);
+ }
+
+ // Consume the length characters.
+ constexpr ConvParser ParseLength() const {
+ return SetFormat(ConsumeAnyOf(format_, "lLhjztq"));
+ }
+
+ // Consume the conversion character and verify that it matches `args_`.
+ // `error_` is set if it doesn't match.
+ constexpr ConvParser ParseConversion() const {
+ return is_positional_
+ ? VerifyPositional({ConsumeFront(format_), arg_position_},
+ GetChar(format_, 0))
+ : ConsumeNextArg(GetChar(format_, 0))
+ .SetFormat(ConsumeFront(format_));
+ }
+
+ constexpr ConvParser(string_view format, ConvList args, bool error,
+ int arg_position, bool is_positional)
+ : format_(format),
+ args_(args),
+ error_(error),
+ arg_position_(arg_position),
+ is_positional_(is_positional) {}
+
+ public:
+ constexpr ConvParser(string_view format, ConvList args, bool is_positional)
+ : format_(format),
+ args_(args),
+ error_(false),
+ arg_position_(0),
+ is_positional_(is_positional) {}
+
+ // Consume the whole conversion specifier.
+ // `format()` will be set to the character after the conversion character.
+ // `error()` will be set if any of the arguments do not match.
+ constexpr ConvParser Run() const {
+ return (is_positional_ ? ParseArgPosition(ParsePositional(format_)) : *this)
+ .ParseFlags()
+ .ParseWidth()
+ .ParsePrecision()
+ .ParseLength()
+ .ParseConversion();
+ }
+
+ constexpr string_view format() const { return format_; }
+ constexpr ConvList args() const { return args_; }
+ constexpr bool error() const { return error_; }
+ constexpr bool is_positional() const { return is_positional_; }
+
+ private:
+ string_view format_;
+ // Current list of arguments. If we are not in positional mode we will consume
+ // from the front.
+ ConvList args_;
+ bool error_;
+ // Holds the argument position of the conversion character, if we are in
+ // positional mode. Otherwise, it is unspecified.
+ int arg_position_;
+ // Whether we are in positional mode.
+ // It changes the behavior of '*' and where to find the converted argument.
+ bool is_positional_;
+};
+
+// Parses a whole format expression.
+// See FormatParser::Run().
+class FormatParser {
+ static constexpr bool FoundPercent(string_view format) {
+ return format.empty() ||
+ (GetChar(format, 0) == '%' && GetChar(format, 1) != '%');
+ }
+
+ // We use an inner function to increase the recursion limit.
+ // The inner function consumes up to `limit` characters on every run.
+ // This increases the limit from 512 to ~512*limit.
+ static constexpr string_view ConsumeNonPercentInner(string_view format,
+ int limit = 20) {
+ return FoundPercent(format) || !limit
+ ? format
+ : ConsumeNonPercentInner(
+ ConsumeFront(format, GetChar(format, 0) == '%' &&
+ GetChar(format, 1) == '%'
+ ? 2
+ : 1),
+ limit - 1);
+ }
+
+ // Consume characters until the next conversion spec %.
+ // It skips %%.
+ static constexpr string_view ConsumeNonPercent(string_view format) {
+ return FoundPercent(format)
+ ? format
+ : ConsumeNonPercent(ConsumeNonPercentInner(format));
+ }
+
+ static constexpr bool IsPositional(string_view format) {
+ return IsDigit(GetChar(format, 0)) ? IsPositional(ConsumeFront(format))
+ : GetChar(format, 0) == '$';
+ }
+
+ constexpr bool RunImpl(bool is_positional) const {
+ // In non-positional mode we require all arguments to be consumed.
+ // In positional mode just reaching the end of the format without errors is
+ // enough.
+ return (format_.empty() && (is_positional || args_.count == 0)) ||
+ (!format_.empty() &&
+ ValidateArg(
+ ConvParser(ConsumeFront(format_), args_, is_positional).Run()));
+ }
+
+ constexpr bool ValidateArg(ConvParser conv) const {
+ return !conv.error() && FormatParser(conv.format(), conv.args())
+ .RunImpl(conv.is_positional());
+ }
+
+ public:
+ constexpr FormatParser(string_view format, ConvList args)
+ : format_(ConsumeNonPercent(format)), args_(args) {}
+
+ // Runs the parser for `format` and `args`.
+ // It verifies that the format is valid and that all conversion specifiers
+ // match the arguments passed.
+ // In non-positional mode it also verfies that all arguments are consumed.
+ constexpr bool Run() const {
+ return RunImpl(!format_.empty() && IsPositional(ConsumeFront(format_)));
+ }
+
+ private:
+ string_view format_;
+ // Current list of arguments.
+ // If we are not in positional mode we will consume from the front and will
+ // have to be empty in the end.
+ ConvList args_;
+};
+
+template <FormatConversionCharSet... C>
+constexpr bool ValidFormatImpl(string_view format) {
+ return FormatParser(format,
+ {ConvListT<sizeof...(C)>{{C...}}.list, sizeof...(C)})
+ .Run();
+}
+
+#endif // ABSL_INTERNAL_ENABLE_FORMAT_CHECKER
+
+} // namespace str_format_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_STRINGS_INTERNAL_STR_FORMAT_CHECKER_H_
diff --git a/third_party/abseil/src/absl/strings/internal/str_format/checker_test.cc b/third_party/abseil/src/absl/strings/internal/str_format/checker_test.cc
new file mode 100644
index 0000000..7c70f47
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/internal/str_format/checker_test.cc
@@ -0,0 +1,170 @@
+// Copyright 2020 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <string>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/strings/str_format.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace str_format_internal {
+namespace {
+
+std::string ConvToString(FormatConversionCharSet conv) {
+ std::string out;
+#define CONV_SET_CASE(c) \
+ if (Contains(conv, FormatConversionCharSetInternal::c)) { \
+ out += #c; \
+ }
+ ABSL_INTERNAL_CONVERSION_CHARS_EXPAND_(CONV_SET_CASE, )
+#undef CONV_SET_CASE
+ if (Contains(conv, FormatConversionCharSetInternal::kStar)) {
+ out += "*";
+ }
+ return out;
+}
+
+TEST(StrFormatChecker, ArgumentToConv) {
+ FormatConversionCharSet conv = ArgumentToConv<std::string>();
+ EXPECT_EQ(ConvToString(conv), "s");
+
+ conv = ArgumentToConv<const char*>();
+ EXPECT_EQ(ConvToString(conv), "sp");
+
+ conv = ArgumentToConv<double>();
+ EXPECT_EQ(ConvToString(conv), "fFeEgGaA");
+
+ conv = ArgumentToConv<int>();
+ EXPECT_EQ(ConvToString(conv), "cdiouxXfFeEgGaA*");
+
+ conv = ArgumentToConv<std::string*>();
+ EXPECT_EQ(ConvToString(conv), "p");
+}
+
+#ifdef ABSL_INTERNAL_ENABLE_FORMAT_CHECKER
+
+struct Case {
+ bool result;
+ const char* format;
+};
+
+template <typename... Args>
+constexpr Case ValidFormat(const char* format) {
+ return {ValidFormatImpl<ArgumentToConv<Args>()...>(format), format};
+}
+
+TEST(StrFormatChecker, ValidFormat) {
+ // We want to make sure these expressions are constexpr and they have the
+ // expected value.
+ // If they are not constexpr the attribute will just ignore them and not give
+ // a compile time error.
+ enum e {};
+ enum class e2 {};
+ constexpr Case trues[] = {
+ ValidFormat<>("abc"), //
+
+ ValidFormat<e>("%d"), //
+ ValidFormat<e2>("%d"), //
+ ValidFormat<int>("%% %d"), //
+ ValidFormat<int>("%ld"), //
+ ValidFormat<int>("%lld"), //
+ ValidFormat<std::string>("%s"), //
+ ValidFormat<std::string>("%10s"), //
+ ValidFormat<int>("%.10x"), //
+ ValidFormat<int, int>("%*.3x"), //
+ ValidFormat<int>("%1.d"), //
+ ValidFormat<int>("%.d"), //
+ ValidFormat<int, double>("%d %g"), //
+ ValidFormat<int, std::string>("%*s"), //
+ ValidFormat<int, double>("%.*f"), //
+ ValidFormat<void (*)(), volatile int*>("%p %p"), //
+ ValidFormat<string_view, const char*, double, void*>(
+ "string_view=%s const char*=%s double=%f void*=%p)"),
+
+ ValidFormat<int>("%% %1$d"), //
+ ValidFormat<int>("%1$ld"), //
+ ValidFormat<int>("%1$lld"), //
+ ValidFormat<std::string>("%1$s"), //
+ ValidFormat<std::string>("%1$10s"), //
+ ValidFormat<int>("%1$.10x"), //
+ ValidFormat<int>("%1$*1$.*1$d"), //
+ ValidFormat<int, int>("%1$*2$.3x"), //
+ ValidFormat<int>("%1$1.d"), //
+ ValidFormat<int>("%1$.d"), //
+ ValidFormat<double, int>("%2$d %1$g"), //
+ ValidFormat<int, std::string>("%2$*1$s"), //
+ ValidFormat<int, double>("%2$.*1$f"), //
+ ValidFormat<void*, string_view, const char*, double>(
+ "string_view=%2$s const char*=%3$s double=%4$f void*=%1$p "
+ "repeat=%3$s)")};
+
+ for (Case c : trues) {
+ EXPECT_TRUE(c.result) << c.format;
+ }
+
+ constexpr Case falses[] = {
+ ValidFormat<int>(""), //
+
+ ValidFormat<e>("%s"), //
+ ValidFormat<e2>("%s"), //
+ ValidFormat<>("%s"), //
+ ValidFormat<>("%r"), //
+ ValidFormat<int>("%s"), //
+ ValidFormat<int>("%.1.d"), //
+ ValidFormat<int>("%*1d"), //
+ ValidFormat<int>("%1-d"), //
+ ValidFormat<std::string, int>("%*s"), //
+ ValidFormat<int>("%*d"), //
+ ValidFormat<std::string>("%p"), //
+ ValidFormat<int (*)(int)>("%d"), //
+
+ ValidFormat<>("%3$d"), //
+ ValidFormat<>("%1$r"), //
+ ValidFormat<int>("%1$s"), //
+ ValidFormat<int>("%1$.1.d"), //
+ ValidFormat<int>("%1$*2$1d"), //
+ ValidFormat<int>("%1$1-d"), //
+ ValidFormat<std::string, int>("%2$*1$s"), //
+ ValidFormat<std::string>("%1$p"),
+
+ ValidFormat<int, int>("%d %2$d"), //
+ };
+
+ for (Case c : falses) {
+ EXPECT_FALSE(c.result) << c.format;
+ }
+}
+
+TEST(StrFormatChecker, LongFormat) {
+#define CHARS_X_40 "1234567890123456789012345678901234567890"
+#define CHARS_X_400 \
+ CHARS_X_40 CHARS_X_40 CHARS_X_40 CHARS_X_40 CHARS_X_40 CHARS_X_40 CHARS_X_40 \
+ CHARS_X_40 CHARS_X_40 CHARS_X_40
+#define CHARS_X_4000 \
+ CHARS_X_400 CHARS_X_400 CHARS_X_400 CHARS_X_400 CHARS_X_400 CHARS_X_400 \
+ CHARS_X_400 CHARS_X_400 CHARS_X_400 CHARS_X_400
+ constexpr char long_format[] =
+ CHARS_X_4000 "%d" CHARS_X_4000 "%s" CHARS_X_4000;
+ constexpr bool is_valid = ValidFormat<int, std::string>(long_format).result;
+ EXPECT_TRUE(is_valid);
+}
+
+#endif // ABSL_INTERNAL_ENABLE_FORMAT_CHECKER
+
+} // namespace
+} // namespace str_format_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/strings/internal/str_format/convert_test.cc b/third_party/abseil/src/absl/strings/internal/str_format/convert_test.cc
new file mode 100644
index 0000000..375db0a
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/internal/str_format/convert_test.cc
@@ -0,0 +1,1242 @@
+// Copyright 2020 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <errno.h>
+#include <stdarg.h>
+#include <stdio.h>
+
+#include <cctype>
+#include <cmath>
+#include <limits>
+#include <string>
+#include <thread> // NOLINT
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/base/internal/raw_logging.h"
+#include "absl/strings/internal/str_format/bind.h"
+#include "absl/strings/match.h"
+#include "absl/types/optional.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace str_format_internal {
+namespace {
+
+struct NativePrintfTraits {
+ bool hex_float_has_glibc_rounding;
+ bool hex_float_prefers_denormal_repr;
+ bool hex_float_uses_minimal_precision_when_not_specified;
+ bool hex_float_optimizes_leading_digit_bit_count;
+};
+
+template <typename T, size_t N>
+size_t ArraySize(T (&)[N]) {
+ return N;
+}
+
+std::string LengthModFor(float) { return ""; }
+std::string LengthModFor(double) { return ""; }
+std::string LengthModFor(long double) { return "L"; }
+std::string LengthModFor(char) { return "hh"; }
+std::string LengthModFor(signed char) { return "hh"; }
+std::string LengthModFor(unsigned char) { return "hh"; }
+std::string LengthModFor(short) { return "h"; } // NOLINT
+std::string LengthModFor(unsigned short) { return "h"; } // NOLINT
+std::string LengthModFor(int) { return ""; }
+std::string LengthModFor(unsigned) { return ""; }
+std::string LengthModFor(long) { return "l"; } // NOLINT
+std::string LengthModFor(unsigned long) { return "l"; } // NOLINT
+std::string LengthModFor(long long) { return "ll"; } // NOLINT
+std::string LengthModFor(unsigned long long) { return "ll"; } // NOLINT
+
+std::string EscCharImpl(int v) {
+ if (std::isprint(static_cast<unsigned char>(v))) {
+ return std::string(1, static_cast<char>(v));
+ }
+ char buf[64];
+ int n = snprintf(buf, sizeof(buf), "\\%#.2x",
+ static_cast<unsigned>(v & 0xff));
+ assert(n > 0 && n < sizeof(buf));
+ return std::string(buf, n);
+}
+
+std::string Esc(char v) { return EscCharImpl(v); }
+std::string Esc(signed char v) { return EscCharImpl(v); }
+std::string Esc(unsigned char v) { return EscCharImpl(v); }
+
+template <typename T>
+std::string Esc(const T &v) {
+ std::ostringstream oss;
+ oss << v;
+ return oss.str();
+}
+
+void StrAppendV(std::string *dst, const char *format, va_list ap) {
+ // First try with a small fixed size buffer
+ static const int kSpaceLength = 1024;
+ char space[kSpaceLength];
+
+ // It's possible for methods that use a va_list to invalidate
+ // the data in it upon use. The fix is to make a copy
+ // of the structure before using it and use that copy instead.
+ va_list backup_ap;
+ va_copy(backup_ap, ap);
+ int result = vsnprintf(space, kSpaceLength, format, backup_ap);
+ va_end(backup_ap);
+ if (result < kSpaceLength) {
+ if (result >= 0) {
+ // Normal case -- everything fit.
+ dst->append(space, result);
+ return;
+ }
+ if (result < 0) {
+ // Just an error.
+ return;
+ }
+ }
+
+ // Increase the buffer size to the size requested by vsnprintf,
+ // plus one for the closing \0.
+ int length = result + 1;
+ char *buf = new char[length];
+
+ // Restore the va_list before we use it again
+ va_copy(backup_ap, ap);
+ result = vsnprintf(buf, length, format, backup_ap);
+ va_end(backup_ap);
+
+ if (result >= 0 && result < length) {
+ // It fit
+ dst->append(buf, result);
+ }
+ delete[] buf;
+}
+
+void StrAppend(std::string *out, const char *format, ...) {
+ va_list ap;
+ va_start(ap, format);
+ StrAppendV(out, format, ap);
+ va_end(ap);
+}
+
+std::string StrPrint(const char *format, ...) {
+ va_list ap;
+ va_start(ap, format);
+ std::string result;
+ StrAppendV(&result, format, ap);
+ va_end(ap);
+ return result;
+}
+
+NativePrintfTraits VerifyNativeImplementationImpl() {
+ NativePrintfTraits result;
+
+ // >>> hex_float_has_glibc_rounding. To have glibc's rounding behavior we need
+ // to meet three requirements:
+ //
+ // - The threshold for rounding up is 8 (for e.g. MSVC uses 9).
+ // - If the digits lower than than the 8 are non-zero then we round up.
+ // - If the digits lower than the 8 are all zero then we round toward even.
+ //
+ // The numbers below represent all the cases covering {below,at,above} the
+ // threshold (8) with both {zero,non-zero} lower bits and both {even,odd}
+ // preceding digits.
+ const double d0079 = 65657.0; // 0x1.0079p+16
+ const double d0179 = 65913.0; // 0x1.0179p+16
+ const double d0080 = 65664.0; // 0x1.0080p+16
+ const double d0180 = 65920.0; // 0x1.0180p+16
+ const double d0081 = 65665.0; // 0x1.0081p+16
+ const double d0181 = 65921.0; // 0x1.0181p+16
+ result.hex_float_has_glibc_rounding =
+ StartsWith(StrPrint("%.2a", d0079), "0x1.00") &&
+ StartsWith(StrPrint("%.2a", d0179), "0x1.01") &&
+ StartsWith(StrPrint("%.2a", d0080), "0x1.00") &&
+ StartsWith(StrPrint("%.2a", d0180), "0x1.02") &&
+ StartsWith(StrPrint("%.2a", d0081), "0x1.01") &&
+ StartsWith(StrPrint("%.2a", d0181), "0x1.02");
+
+ // >>> hex_float_prefers_denormal_repr. Formatting `denormal` on glibc yields
+ // "0x0.0000000000001p-1022", whereas on std libs that don't use denormal
+ // representation it would either be 0x1p-1074 or 0x1.0000000000000-1074.
+ const double denormal = std::numeric_limits<double>::denorm_min();
+ result.hex_float_prefers_denormal_repr =
+ StartsWith(StrPrint("%a", denormal), "0x0.0000000000001");
+
+ // >>> hex_float_uses_minimal_precision_when_not_specified. Some (non-glibc)
+ // libs will format the following as "0x1.0079000000000p+16".
+ result.hex_float_uses_minimal_precision_when_not_specified =
+ (StrPrint("%a", d0079) == "0x1.0079p+16");
+
+ // >>> hex_float_optimizes_leading_digit_bit_count. The number 1.5, when
+ // formatted by glibc should yield "0x1.8p+0" for `double` and "0xcp-3" for
+ // `long double`, i.e., number of bits in the leading digit is adapted to the
+ // number of bits in the mantissa.
+ const double d_15 = 1.5;
+ const long double ld_15 = 1.5;
+ result.hex_float_optimizes_leading_digit_bit_count =
+ StartsWith(StrPrint("%a", d_15), "0x1.8") &&
+ StartsWith(StrPrint("%La", ld_15), "0xc");
+
+ return result;
+}
+
+const NativePrintfTraits &VerifyNativeImplementation() {
+ static NativePrintfTraits native_traits = VerifyNativeImplementationImpl();
+ return native_traits;
+}
+
+class FormatConvertTest : public ::testing::Test { };
+
+template <typename T>
+void TestStringConvert(const T& str) {
+ const FormatArgImpl args[] = {FormatArgImpl(str)};
+ struct Expectation {
+ const char *out;
+ const char *fmt;
+ };
+ const Expectation kExpect[] = {
+ {"hello", "%1$s" },
+ {"", "%1$.s" },
+ {"", "%1$.0s" },
+ {"h", "%1$.1s" },
+ {"he", "%1$.2s" },
+ {"hello", "%1$.10s" },
+ {" hello", "%1$6s" },
+ {" he", "%1$5.2s" },
+ {"he ", "%1$-5.2s" },
+ {"hello ", "%1$-6.10s" },
+ };
+ for (const Expectation &e : kExpect) {
+ UntypedFormatSpecImpl format(e.fmt);
+ EXPECT_EQ(e.out, FormatPack(format, absl::MakeSpan(args)));
+ }
+}
+
+TEST_F(FormatConvertTest, BasicString) {
+ TestStringConvert("hello"); // As char array.
+ TestStringConvert(static_cast<const char*>("hello"));
+ TestStringConvert(std::string("hello"));
+ TestStringConvert(string_view("hello"));
+}
+
+TEST_F(FormatConvertTest, NullString) {
+ const char* p = nullptr;
+ UntypedFormatSpecImpl format("%s");
+ EXPECT_EQ("", FormatPack(format, {FormatArgImpl(p)}));
+}
+
+TEST_F(FormatConvertTest, StringPrecision) {
+ // We cap at the precision.
+ char c = 'a';
+ const char* p = &c;
+ UntypedFormatSpecImpl format("%.1s");
+ EXPECT_EQ("a", FormatPack(format, {FormatArgImpl(p)}));
+
+ // We cap at the NUL-terminator.
+ p = "ABC";
+ UntypedFormatSpecImpl format2("%.10s");
+ EXPECT_EQ("ABC", FormatPack(format2, {FormatArgImpl(p)}));
+}
+
+// Pointer formatting is implementation defined. This checks that the argument
+// can be matched to `ptr`.
+MATCHER_P(MatchesPointerString, ptr, "") {
+ if (ptr == nullptr && arg == "(nil)") {
+ return true;
+ }
+ void* parsed = nullptr;
+ if (sscanf(arg.c_str(), "%p", &parsed) != 1) {
+ ABSL_RAW_LOG(FATAL, "Could not parse %s", arg.c_str());
+ }
+ return ptr == parsed;
+}
+
+TEST_F(FormatConvertTest, Pointer) {
+ static int x = 0;
+ const int *xp = &x;
+ char c = 'h';
+ char *mcp = &c;
+ const char *cp = "hi";
+ const char *cnil = nullptr;
+ const int *inil = nullptr;
+ using VoidF = void (*)();
+ VoidF fp = [] {}, fnil = nullptr;
+ volatile char vc;
+ volatile char *vcp = &vc;
+ volatile char *vcnil = nullptr;
+ const FormatArgImpl args_array[] = {
+ FormatArgImpl(xp), FormatArgImpl(cp), FormatArgImpl(inil),
+ FormatArgImpl(cnil), FormatArgImpl(mcp), FormatArgImpl(fp),
+ FormatArgImpl(fnil), FormatArgImpl(vcp), FormatArgImpl(vcnil),
+ };
+ auto args = absl::MakeConstSpan(args_array);
+
+ EXPECT_THAT(FormatPack(UntypedFormatSpecImpl("%p"), args),
+ MatchesPointerString(&x));
+ EXPECT_THAT(FormatPack(UntypedFormatSpecImpl("%20p"), args),
+ MatchesPointerString(&x));
+ EXPECT_THAT(FormatPack(UntypedFormatSpecImpl("%.1p"), args),
+ MatchesPointerString(&x));
+ EXPECT_THAT(FormatPack(UntypedFormatSpecImpl("%.20p"), args),
+ MatchesPointerString(&x));
+ EXPECT_THAT(FormatPack(UntypedFormatSpecImpl("%30.20p"), args),
+ MatchesPointerString(&x));
+
+ EXPECT_THAT(FormatPack(UntypedFormatSpecImpl("%-p"), args),
+ MatchesPointerString(&x));
+ EXPECT_THAT(FormatPack(UntypedFormatSpecImpl("%-20p"), args),
+ MatchesPointerString(&x));
+ EXPECT_THAT(FormatPack(UntypedFormatSpecImpl("%-.1p"), args),
+ MatchesPointerString(&x));
+ EXPECT_THAT(FormatPack(UntypedFormatSpecImpl("%.20p"), args),
+ MatchesPointerString(&x));
+ EXPECT_THAT(FormatPack(UntypedFormatSpecImpl("%-30.20p"), args),
+ MatchesPointerString(&x));
+
+ // const char*
+ EXPECT_THAT(FormatPack(UntypedFormatSpecImpl("%2$p"), args),
+ MatchesPointerString(cp));
+ // null const int*
+ EXPECT_THAT(FormatPack(UntypedFormatSpecImpl("%3$p"), args),
+ MatchesPointerString(nullptr));
+ // null const char*
+ EXPECT_THAT(FormatPack(UntypedFormatSpecImpl("%4$p"), args),
+ MatchesPointerString(nullptr));
+ // nonconst char*
+ EXPECT_THAT(FormatPack(UntypedFormatSpecImpl("%5$p"), args),
+ MatchesPointerString(mcp));
+
+ // function pointers
+ EXPECT_THAT(FormatPack(UntypedFormatSpecImpl("%6$p"), args),
+ MatchesPointerString(reinterpret_cast<const void*>(fp)));
+ EXPECT_THAT(
+ FormatPack(UntypedFormatSpecImpl("%8$p"), args),
+ MatchesPointerString(reinterpret_cast<volatile const void *>(vcp)));
+
+ // null function pointers
+ EXPECT_THAT(FormatPack(UntypedFormatSpecImpl("%7$p"), args),
+ MatchesPointerString(nullptr));
+ EXPECT_THAT(FormatPack(UntypedFormatSpecImpl("%9$p"), args),
+ MatchesPointerString(nullptr));
+}
+
+struct Cardinal {
+ enum Pos { k1 = 1, k2 = 2, k3 = 3 };
+ enum Neg { kM1 = -1, kM2 = -2, kM3 = -3 };
+};
+
+TEST_F(FormatConvertTest, Enum) {
+ const Cardinal::Pos k3 = Cardinal::k3;
+ const Cardinal::Neg km3 = Cardinal::kM3;
+ const FormatArgImpl args[] = {FormatArgImpl(k3), FormatArgImpl(km3)};
+ UntypedFormatSpecImpl format("%1$d");
+ UntypedFormatSpecImpl format2("%2$d");
+ EXPECT_EQ("3", FormatPack(format, absl::MakeSpan(args)));
+ EXPECT_EQ("-3", FormatPack(format2, absl::MakeSpan(args)));
+}
+
+template <typename T>
+class TypedFormatConvertTest : public FormatConvertTest { };
+
+TYPED_TEST_SUITE_P(TypedFormatConvertTest);
+
+std::vector<std::string> AllFlagCombinations() {
+ const char kFlags[] = {'-', '#', '0', '+', ' '};
+ std::vector<std::string> result;
+ for (size_t fsi = 0; fsi < (1ull << ArraySize(kFlags)); ++fsi) {
+ std::string flag_set;
+ for (size_t fi = 0; fi < ArraySize(kFlags); ++fi)
+ if (fsi & (1ull << fi))
+ flag_set += kFlags[fi];
+ result.push_back(flag_set);
+ }
+ return result;
+}
+
+TYPED_TEST_P(TypedFormatConvertTest, AllIntsWithFlags) {
+ typedef TypeParam T;
+ typedef typename std::make_unsigned<T>::type UnsignedT;
+ using remove_volatile_t = typename std::remove_volatile<T>::type;
+ const T kMin = std::numeric_limits<remove_volatile_t>::min();
+ const T kMax = std::numeric_limits<remove_volatile_t>::max();
+ const T kVals[] = {
+ remove_volatile_t(1),
+ remove_volatile_t(2),
+ remove_volatile_t(3),
+ remove_volatile_t(123),
+ remove_volatile_t(-1),
+ remove_volatile_t(-2),
+ remove_volatile_t(-3),
+ remove_volatile_t(-123),
+ remove_volatile_t(0),
+ kMax - remove_volatile_t(1),
+ kMax,
+ kMin + remove_volatile_t(1),
+ kMin,
+ };
+ const char kConvChars[] = {'d', 'i', 'u', 'o', 'x', 'X'};
+ const std::string kWid[] = {"", "4", "10"};
+ const std::string kPrec[] = {"", ".", ".0", ".4", ".10"};
+
+ const std::vector<std::string> flag_sets = AllFlagCombinations();
+
+ for (size_t vi = 0; vi < ArraySize(kVals); ++vi) {
+ const T val = kVals[vi];
+ SCOPED_TRACE(Esc(val));
+ const FormatArgImpl args[] = {FormatArgImpl(val)};
+ for (size_t ci = 0; ci < ArraySize(kConvChars); ++ci) {
+ const char conv_char = kConvChars[ci];
+ for (size_t fsi = 0; fsi < flag_sets.size(); ++fsi) {
+ const std::string &flag_set = flag_sets[fsi];
+ for (size_t wi = 0; wi < ArraySize(kWid); ++wi) {
+ const std::string &wid = kWid[wi];
+ for (size_t pi = 0; pi < ArraySize(kPrec); ++pi) {
+ const std::string &prec = kPrec[pi];
+
+ const bool is_signed_conv = (conv_char == 'd' || conv_char == 'i');
+ const bool is_unsigned_to_signed =
+ !std::is_signed<T>::value && is_signed_conv;
+ // Don't consider sign-related flags '+' and ' ' when doing
+ // unsigned to signed conversions.
+ if (is_unsigned_to_signed &&
+ flag_set.find_first_of("+ ") != std::string::npos) {
+ continue;
+ }
+
+ std::string new_fmt("%");
+ new_fmt += flag_set;
+ new_fmt += wid;
+ new_fmt += prec;
+ // old and new always agree up to here.
+ std::string old_fmt = new_fmt;
+ new_fmt += conv_char;
+ std::string old_result;
+ if (is_unsigned_to_signed) {
+ // don't expect agreement on unsigned formatted as signed,
+ // as printf can't do that conversion properly. For those
+ // cases, we do expect agreement with printf with a "%u"
+ // and the unsigned equivalent of 'val'.
+ UnsignedT uval = val;
+ old_fmt += LengthModFor(uval);
+ old_fmt += "u";
+ old_result = StrPrint(old_fmt.c_str(), uval);
+ } else {
+ old_fmt += LengthModFor(val);
+ old_fmt += conv_char;
+ old_result = StrPrint(old_fmt.c_str(), val);
+ }
+
+ SCOPED_TRACE(std::string() + " old_fmt: \"" + old_fmt +
+ "\"'"
+ " new_fmt: \"" +
+ new_fmt + "\"");
+ UntypedFormatSpecImpl format(new_fmt);
+ EXPECT_EQ(old_result, FormatPack(format, absl::MakeSpan(args)));
+ }
+ }
+ }
+ }
+ }
+}
+
+TYPED_TEST_P(TypedFormatConvertTest, Char) {
+ typedef TypeParam T;
+ using remove_volatile_t = typename std::remove_volatile<T>::type;
+ static const T kMin = std::numeric_limits<remove_volatile_t>::min();
+ static const T kMax = std::numeric_limits<remove_volatile_t>::max();
+ T kVals[] = {
+ remove_volatile_t(1), remove_volatile_t(2), remove_volatile_t(10),
+ remove_volatile_t(-1), remove_volatile_t(-2), remove_volatile_t(-10),
+ remove_volatile_t(0),
+ kMin + remove_volatile_t(1), kMin,
+ kMax - remove_volatile_t(1), kMax
+ };
+ for (const T &c : kVals) {
+ const FormatArgImpl args[] = {FormatArgImpl(c)};
+ UntypedFormatSpecImpl format("%c");
+ EXPECT_EQ(StrPrint("%c", c), FormatPack(format, absl::MakeSpan(args)));
+ }
+}
+
+REGISTER_TYPED_TEST_CASE_P(TypedFormatConvertTest, AllIntsWithFlags, Char);
+
+typedef ::testing::Types<
+ int, unsigned, volatile int,
+ short, unsigned short,
+ long, unsigned long,
+ long long, unsigned long long,
+ signed char, unsigned char, char>
+ AllIntTypes;
+INSTANTIATE_TYPED_TEST_CASE_P(TypedFormatConvertTestWithAllIntTypes,
+ TypedFormatConvertTest, AllIntTypes);
+TEST_F(FormatConvertTest, VectorBool) {
+ // Make sure vector<bool>'s values behave as bools.
+ std::vector<bool> v = {true, false};
+ const std::vector<bool> cv = {true, false};
+ EXPECT_EQ("1,0,1,0",
+ FormatPack(UntypedFormatSpecImpl("%d,%d,%d,%d"),
+ absl::Span<const FormatArgImpl>(
+ {FormatArgImpl(v[0]), FormatArgImpl(v[1]),
+ FormatArgImpl(cv[0]), FormatArgImpl(cv[1])})));
+}
+
+
+TEST_F(FormatConvertTest, Int128) {
+ absl::int128 positive = static_cast<absl::int128>(0x1234567890abcdef) * 1979;
+ absl::int128 negative = -positive;
+ absl::int128 max = absl::Int128Max(), min = absl::Int128Min();
+ const FormatArgImpl args[] = {FormatArgImpl(positive),
+ FormatArgImpl(negative), FormatArgImpl(max),
+ FormatArgImpl(min)};
+
+ struct Case {
+ const char* format;
+ const char* expected;
+ } cases[] = {
+ {"%1$d", "2595989796776606496405"},
+ {"%1$30d", " 2595989796776606496405"},
+ {"%1$-30d", "2595989796776606496405 "},
+ {"%1$u", "2595989796776606496405"},
+ {"%1$x", "8cba9876066020f695"},
+ {"%2$d", "-2595989796776606496405"},
+ {"%2$30d", " -2595989796776606496405"},
+ {"%2$-30d", "-2595989796776606496405 "},
+ {"%2$u", "340282366920938460867384810655161715051"},
+ {"%2$x", "ffffffffffffff73456789f99fdf096b"},
+ {"%3$d", "170141183460469231731687303715884105727"},
+ {"%3$u", "170141183460469231731687303715884105727"},
+ {"%3$x", "7fffffffffffffffffffffffffffffff"},
+ {"%4$d", "-170141183460469231731687303715884105728"},
+ {"%4$x", "80000000000000000000000000000000"},
+ };
+
+ for (auto c : cases) {
+ UntypedFormatSpecImpl format(c.format);
+ EXPECT_EQ(c.expected, FormatPack(format, absl::MakeSpan(args)));
+ }
+}
+
+TEST_F(FormatConvertTest, Uint128) {
+ absl::uint128 v = static_cast<absl::uint128>(0x1234567890abcdef) * 1979;
+ absl::uint128 max = absl::Uint128Max();
+ const FormatArgImpl args[] = {FormatArgImpl(v), FormatArgImpl(max)};
+
+ struct Case {
+ const char* format;
+ const char* expected;
+ } cases[] = {
+ {"%1$d", "2595989796776606496405"},
+ {"%1$30d", " 2595989796776606496405"},
+ {"%1$-30d", "2595989796776606496405 "},
+ {"%1$u", "2595989796776606496405"},
+ {"%1$x", "8cba9876066020f695"},
+ {"%2$d", "340282366920938463463374607431768211455"},
+ {"%2$u", "340282366920938463463374607431768211455"},
+ {"%2$x", "ffffffffffffffffffffffffffffffff"},
+ };
+
+ for (auto c : cases) {
+ UntypedFormatSpecImpl format(c.format);
+ EXPECT_EQ(c.expected, FormatPack(format, absl::MakeSpan(args)));
+ }
+}
+
+template <typename Floating>
+void TestWithMultipleFormatsHelper(const std::vector<Floating> &floats) {
+ const NativePrintfTraits &native_traits = VerifyNativeImplementation();
+ // Reserve the space to ensure we don't allocate memory in the output itself.
+ std::string str_format_result;
+ str_format_result.reserve(1 << 20);
+ std::string string_printf_result;
+ string_printf_result.reserve(1 << 20);
+
+ const char *const kFormats[] = {
+ "%", "%.3", "%8.5", "%500", "%.5000", "%.60", "%.30", "%03",
+ "%+", "% ", "%-10", "%#15.3", "%#.0", "%.0", "%1$*2$", "%1$.*2$"};
+
+ for (const char *fmt : kFormats) {
+ for (char f : {'f', 'F', //
+ 'g', 'G', //
+ 'a', 'A', //
+ 'e', 'E'}) {
+ std::string fmt_str = std::string(fmt) + f;
+
+ if (fmt == absl::string_view("%.5000") && f != 'f' && f != 'F' &&
+ f != 'a' && f != 'A') {
+ // This particular test takes way too long with snprintf.
+ // Disable for the case we are not implementing natively.
+ continue;
+ }
+
+ if ((f == 'a' || f == 'A') &&
+ !native_traits.hex_float_has_glibc_rounding) {
+ continue;
+ }
+
+ for (Floating d : floats) {
+ if (!native_traits.hex_float_prefers_denormal_repr &&
+ (f == 'a' || f == 'A') && std::fpclassify(d) == FP_SUBNORMAL) {
+ continue;
+ }
+ int i = -10;
+ FormatArgImpl args[2] = {FormatArgImpl(d), FormatArgImpl(i)};
+ UntypedFormatSpecImpl format(fmt_str);
+
+ string_printf_result.clear();
+ StrAppend(&string_printf_result, fmt_str.c_str(), d, i);
+ str_format_result.clear();
+
+ {
+ AppendPack(&str_format_result, format, absl::MakeSpan(args));
+ }
+
+ if (string_printf_result != str_format_result) {
+ // We use ASSERT_EQ here because failures are usually correlated and a
+ // bug would print way too many failed expectations causing the test
+ // to time out.
+ ASSERT_EQ(string_printf_result, str_format_result)
+ << fmt_str << " " << StrPrint("%.18g", d) << " "
+ << StrPrint("%a", d) << " " << StrPrint("%.50f", d);
+ }
+ }
+ }
+ }
+}
+
+TEST_F(FormatConvertTest, Float) {
+#ifdef _MSC_VER
+ // MSVC has a different rounding policy than us so we can't test our
+ // implementation against the native one there.
+ return;
+#endif // _MSC_VER
+
+ std::vector<float> floats = {0.0f,
+ -0.0f,
+ .9999999f,
+ 9999999.f,
+ std::numeric_limits<float>::max(),
+ -std::numeric_limits<float>::max(),
+ std::numeric_limits<float>::min(),
+ -std::numeric_limits<float>::min(),
+ std::numeric_limits<float>::lowest(),
+ -std::numeric_limits<float>::lowest(),
+ std::numeric_limits<float>::epsilon(),
+ std::numeric_limits<float>::epsilon() + 1.0f,
+ std::numeric_limits<float>::infinity(),
+ -std::numeric_limits<float>::infinity()};
+
+ // Some regression tests.
+ floats.push_back(0.999999989f);
+
+ if (std::numeric_limits<float>::has_denorm != std::denorm_absent) {
+ floats.push_back(std::numeric_limits<float>::denorm_min());
+ floats.push_back(-std::numeric_limits<float>::denorm_min());
+ }
+
+ for (float base :
+ {1.f, 12.f, 123.f, 1234.f, 12345.f, 123456.f, 1234567.f, 12345678.f,
+ 123456789.f, 1234567890.f, 12345678901.f, 12345678.f, 12345678.f}) {
+ for (int exp = -123; exp <= 123; ++exp) {
+ for (int sign : {1, -1}) {
+ floats.push_back(sign * std::ldexp(base, exp));
+ }
+ }
+ }
+
+ for (int exp = -300; exp <= 300; ++exp) {
+ const float all_ones_mantissa = 0xffffff;
+ floats.push_back(std::ldexp(all_ones_mantissa, exp));
+ }
+
+ // Remove duplicates to speed up the logic below.
+ std::sort(floats.begin(), floats.end());
+ floats.erase(std::unique(floats.begin(), floats.end()), floats.end());
+
+#ifndef __APPLE__
+ // Apple formats NaN differently (+nan) vs. (nan)
+ floats.push_back(std::nan(""));
+#endif
+
+ TestWithMultipleFormatsHelper(floats);
+}
+
+TEST_F(FormatConvertTest, Double) {
+#ifdef _MSC_VER
+ // MSVC has a different rounding policy than us so we can't test our
+ // implementation against the native one there.
+ return;
+#endif // _MSC_VER
+
+ std::vector<double> doubles = {0.0,
+ -0.0,
+ .99999999999999,
+ 99999999999999.,
+ std::numeric_limits<double>::max(),
+ -std::numeric_limits<double>::max(),
+ std::numeric_limits<double>::min(),
+ -std::numeric_limits<double>::min(),
+ std::numeric_limits<double>::lowest(),
+ -std::numeric_limits<double>::lowest(),
+ std::numeric_limits<double>::epsilon(),
+ std::numeric_limits<double>::epsilon() + 1,
+ std::numeric_limits<double>::infinity(),
+ -std::numeric_limits<double>::infinity()};
+
+ // Some regression tests.
+ doubles.push_back(0.99999999999999989);
+
+ if (std::numeric_limits<double>::has_denorm != std::denorm_absent) {
+ doubles.push_back(std::numeric_limits<double>::denorm_min());
+ doubles.push_back(-std::numeric_limits<double>::denorm_min());
+ }
+
+ for (double base :
+ {1., 12., 123., 1234., 12345., 123456., 1234567., 12345678., 123456789.,
+ 1234567890., 12345678901., 123456789012., 1234567890123.}) {
+ for (int exp = -123; exp <= 123; ++exp) {
+ for (int sign : {1, -1}) {
+ doubles.push_back(sign * std::ldexp(base, exp));
+ }
+ }
+ }
+
+ // Workaround libc bug.
+ // https://sourceware.org/bugzilla/show_bug.cgi?id=22142
+ const bool gcc_bug_22142 =
+ StrPrint("%f", std::numeric_limits<double>::max()) !=
+ "1797693134862315708145274237317043567980705675258449965989174768031"
+ "5726078002853876058955863276687817154045895351438246423432132688946"
+ "4182768467546703537516986049910576551282076245490090389328944075868"
+ "5084551339423045832369032229481658085593321233482747978262041447231"
+ "68738177180919299881250404026184124858368.000000";
+
+ if (!gcc_bug_22142) {
+ for (int exp = -300; exp <= 300; ++exp) {
+ const double all_ones_mantissa = 0x1fffffffffffff;
+ doubles.push_back(std::ldexp(all_ones_mantissa, exp));
+ }
+ }
+
+ if (gcc_bug_22142) {
+ for (auto &d : doubles) {
+ using L = std::numeric_limits<double>;
+ double d2 = std::abs(d);
+ if (d2 == L::max() || d2 == L::min() || d2 == L::denorm_min()) {
+ d = 0;
+ }
+ }
+ }
+
+ // Remove duplicates to speed up the logic below.
+ std::sort(doubles.begin(), doubles.end());
+ doubles.erase(std::unique(doubles.begin(), doubles.end()), doubles.end());
+
+#ifndef __APPLE__
+ // Apple formats NaN differently (+nan) vs. (nan)
+ doubles.push_back(std::nan(""));
+#endif
+
+ TestWithMultipleFormatsHelper(doubles);
+}
+
+TEST_F(FormatConvertTest, DoubleRound) {
+ std::string s;
+ const auto format = [&](const char *fmt, double d) -> std::string & {
+ s.clear();
+ FormatArgImpl args[1] = {FormatArgImpl(d)};
+ AppendPack(&s, UntypedFormatSpecImpl(fmt), absl::MakeSpan(args));
+#if !defined(_MSC_VER)
+ // MSVC has a different rounding policy than us so we can't test our
+ // implementation against the native one there.
+ EXPECT_EQ(StrPrint(fmt, d), s);
+#endif // _MSC_VER
+
+ return s;
+ };
+ // All of these values have to be exactly represented.
+ // Otherwise we might not be testing what we think we are testing.
+
+ // These values can fit in a 64bit "fast" representation.
+ const double exact_value = 0.00000000000005684341886080801486968994140625;
+ assert(exact_value == std::pow(2, -44));
+ // Round up at a 5xx.
+ EXPECT_EQ(format("%.13f", exact_value), "0.0000000000001");
+ // Round up at a >5
+ EXPECT_EQ(format("%.14f", exact_value), "0.00000000000006");
+ // Round down at a <5
+ EXPECT_EQ(format("%.16f", exact_value), "0.0000000000000568");
+ // Nine handling
+ EXPECT_EQ(format("%.35f", exact_value),
+ "0.00000000000005684341886080801486969");
+ EXPECT_EQ(format("%.36f", exact_value),
+ "0.000000000000056843418860808014869690");
+ // Round down the last nine.
+ EXPECT_EQ(format("%.37f", exact_value),
+ "0.0000000000000568434188608080148696899");
+ EXPECT_EQ(format("%.10f", 0.000003814697265625), "0.0000038147");
+ // Round up the last nine
+ EXPECT_EQ(format("%.11f", 0.000003814697265625), "0.00000381470");
+ EXPECT_EQ(format("%.12f", 0.000003814697265625), "0.000003814697");
+
+ // Round to even (down)
+ EXPECT_EQ(format("%.43f", exact_value),
+ "0.0000000000000568434188608080148696899414062");
+ // Exact
+ EXPECT_EQ(format("%.44f", exact_value),
+ "0.00000000000005684341886080801486968994140625");
+ // Round to even (up), let make the last digits 75 instead of 25
+ EXPECT_EQ(format("%.43f", exact_value + std::pow(2, -43)),
+ "0.0000000000001705302565824240446090698242188");
+ // Exact, just to check.
+ EXPECT_EQ(format("%.44f", exact_value + std::pow(2, -43)),
+ "0.00000000000017053025658242404460906982421875");
+
+ // This value has to be small enough that it won't fit in the uint128
+ // representation for printing.
+ const double small_exact_value =
+ 0.000000000000000000000000000000000000752316384526264005099991383822237233803945956334136013765601092018187046051025390625; // NOLINT
+ assert(small_exact_value == std::pow(2, -120));
+ // Round up at a 5xx.
+ EXPECT_EQ(format("%.37f", small_exact_value),
+ "0.0000000000000000000000000000000000008");
+ // Round down at a <5
+ EXPECT_EQ(format("%.38f", small_exact_value),
+ "0.00000000000000000000000000000000000075");
+ // Round up at a >5
+ EXPECT_EQ(format("%.41f", small_exact_value),
+ "0.00000000000000000000000000000000000075232");
+ // Nine handling
+ EXPECT_EQ(format("%.55f", small_exact_value),
+ "0.0000000000000000000000000000000000007523163845262640051");
+ EXPECT_EQ(format("%.56f", small_exact_value),
+ "0.00000000000000000000000000000000000075231638452626400510");
+ EXPECT_EQ(format("%.57f", small_exact_value),
+ "0.000000000000000000000000000000000000752316384526264005100");
+ EXPECT_EQ(format("%.58f", small_exact_value),
+ "0.0000000000000000000000000000000000007523163845262640051000");
+ // Round down the last nine
+ EXPECT_EQ(format("%.59f", small_exact_value),
+ "0.00000000000000000000000000000000000075231638452626400509999");
+ // Round up the last nine
+ EXPECT_EQ(format("%.79f", small_exact_value),
+ "0.000000000000000000000000000000000000"
+ "7523163845262640050999913838222372338039460");
+
+ // Round to even (down)
+ EXPECT_EQ(format("%.119f", small_exact_value),
+ "0.000000000000000000000000000000000000"
+ "75231638452626400509999138382223723380"
+ "394595633413601376560109201818704605102539062");
+ // Exact
+ EXPECT_EQ(format("%.120f", small_exact_value),
+ "0.000000000000000000000000000000000000"
+ "75231638452626400509999138382223723380"
+ "3945956334136013765601092018187046051025390625");
+ // Round to even (up), let make the last digits 75 instead of 25
+ EXPECT_EQ(format("%.119f", small_exact_value + std::pow(2, -119)),
+ "0.000000000000000000000000000000000002"
+ "25694915357879201529997415146671170141"
+ "183786900240804129680327605456113815307617188");
+ // Exact, just to check.
+ EXPECT_EQ(format("%.120f", small_exact_value + std::pow(2, -119)),
+ "0.000000000000000000000000000000000002"
+ "25694915357879201529997415146671170141"
+ "1837869002408041296803276054561138153076171875");
+}
+
+TEST_F(FormatConvertTest, DoubleRoundA) {
+ const NativePrintfTraits &native_traits = VerifyNativeImplementation();
+ std::string s;
+ const auto format = [&](const char *fmt, double d) -> std::string & {
+ s.clear();
+ FormatArgImpl args[1] = {FormatArgImpl(d)};
+ AppendPack(&s, UntypedFormatSpecImpl(fmt), absl::MakeSpan(args));
+ if (native_traits.hex_float_has_glibc_rounding) {
+ EXPECT_EQ(StrPrint(fmt, d), s);
+ }
+ return s;
+ };
+
+ // 0x1.00018000p+100
+ const double on_boundary_odd = 1267679614447900152596896153600.0;
+ EXPECT_EQ(format("%.0a", on_boundary_odd), "0x1p+100");
+ EXPECT_EQ(format("%.1a", on_boundary_odd), "0x1.0p+100");
+ EXPECT_EQ(format("%.2a", on_boundary_odd), "0x1.00p+100");
+ EXPECT_EQ(format("%.3a", on_boundary_odd), "0x1.000p+100");
+ EXPECT_EQ(format("%.4a", on_boundary_odd), "0x1.0002p+100"); // round
+ EXPECT_EQ(format("%.5a", on_boundary_odd), "0x1.00018p+100");
+ EXPECT_EQ(format("%.6a", on_boundary_odd), "0x1.000180p+100");
+
+ // 0x1.00028000p-2
+ const double on_boundary_even = 0.250009536743164062500;
+ EXPECT_EQ(format("%.0a", on_boundary_even), "0x1p-2");
+ EXPECT_EQ(format("%.1a", on_boundary_even), "0x1.0p-2");
+ EXPECT_EQ(format("%.2a", on_boundary_even), "0x1.00p-2");
+ EXPECT_EQ(format("%.3a", on_boundary_even), "0x1.000p-2");
+ EXPECT_EQ(format("%.4a", on_boundary_even), "0x1.0002p-2"); // no round
+ EXPECT_EQ(format("%.5a", on_boundary_even), "0x1.00028p-2");
+ EXPECT_EQ(format("%.6a", on_boundary_even), "0x1.000280p-2");
+
+ // 0x1.00018001p+1
+ const double slightly_over = 2.00004577683284878730773925781250;
+ EXPECT_EQ(format("%.0a", slightly_over), "0x1p+1");
+ EXPECT_EQ(format("%.1a", slightly_over), "0x1.0p+1");
+ EXPECT_EQ(format("%.2a", slightly_over), "0x1.00p+1");
+ EXPECT_EQ(format("%.3a", slightly_over), "0x1.000p+1");
+ EXPECT_EQ(format("%.4a", slightly_over), "0x1.0002p+1");
+ EXPECT_EQ(format("%.5a", slightly_over), "0x1.00018p+1");
+ EXPECT_EQ(format("%.6a", slightly_over), "0x1.000180p+1");
+
+ // 0x1.00017fffp+0
+ const double slightly_under = 1.000022887950763106346130371093750;
+ EXPECT_EQ(format("%.0a", slightly_under), "0x1p+0");
+ EXPECT_EQ(format("%.1a", slightly_under), "0x1.0p+0");
+ EXPECT_EQ(format("%.2a", slightly_under), "0x1.00p+0");
+ EXPECT_EQ(format("%.3a", slightly_under), "0x1.000p+0");
+ EXPECT_EQ(format("%.4a", slightly_under), "0x1.0001p+0");
+ EXPECT_EQ(format("%.5a", slightly_under), "0x1.00018p+0");
+ EXPECT_EQ(format("%.6a", slightly_under), "0x1.000180p+0");
+ EXPECT_EQ(format("%.7a", slightly_under), "0x1.0001800p+0");
+
+ // 0x1.1b3829ac28058p+3
+ const double hex_value = 8.85060580848964661981881363317370414733886718750;
+ EXPECT_EQ(format("%.0a", hex_value), "0x1p+3");
+ EXPECT_EQ(format("%.1a", hex_value), "0x1.2p+3");
+ EXPECT_EQ(format("%.2a", hex_value), "0x1.1bp+3");
+ EXPECT_EQ(format("%.3a", hex_value), "0x1.1b4p+3");
+ EXPECT_EQ(format("%.4a", hex_value), "0x1.1b38p+3");
+ EXPECT_EQ(format("%.5a", hex_value), "0x1.1b383p+3");
+ EXPECT_EQ(format("%.6a", hex_value), "0x1.1b382ap+3");
+ EXPECT_EQ(format("%.7a", hex_value), "0x1.1b3829bp+3");
+ EXPECT_EQ(format("%.8a", hex_value), "0x1.1b3829acp+3");
+ EXPECT_EQ(format("%.9a", hex_value), "0x1.1b3829ac3p+3");
+ EXPECT_EQ(format("%.10a", hex_value), "0x1.1b3829ac28p+3");
+ EXPECT_EQ(format("%.11a", hex_value), "0x1.1b3829ac280p+3");
+ EXPECT_EQ(format("%.12a", hex_value), "0x1.1b3829ac2806p+3");
+ EXPECT_EQ(format("%.13a", hex_value), "0x1.1b3829ac28058p+3");
+ EXPECT_EQ(format("%.14a", hex_value), "0x1.1b3829ac280580p+3");
+ EXPECT_EQ(format("%.15a", hex_value), "0x1.1b3829ac2805800p+3");
+ EXPECT_EQ(format("%.16a", hex_value), "0x1.1b3829ac28058000p+3");
+ EXPECT_EQ(format("%.17a", hex_value), "0x1.1b3829ac280580000p+3");
+ EXPECT_EQ(format("%.18a", hex_value), "0x1.1b3829ac2805800000p+3");
+ EXPECT_EQ(format("%.19a", hex_value), "0x1.1b3829ac28058000000p+3");
+ EXPECT_EQ(format("%.20a", hex_value), "0x1.1b3829ac280580000000p+3");
+ EXPECT_EQ(format("%.21a", hex_value), "0x1.1b3829ac2805800000000p+3");
+
+ // 0x1.0818283848586p+3
+ const double hex_value2 = 8.2529488658208371987257123691961169242858886718750;
+ EXPECT_EQ(format("%.0a", hex_value2), "0x1p+3");
+ EXPECT_EQ(format("%.1a", hex_value2), "0x1.1p+3");
+ EXPECT_EQ(format("%.2a", hex_value2), "0x1.08p+3");
+ EXPECT_EQ(format("%.3a", hex_value2), "0x1.082p+3");
+ EXPECT_EQ(format("%.4a", hex_value2), "0x1.0818p+3");
+ EXPECT_EQ(format("%.5a", hex_value2), "0x1.08183p+3");
+ EXPECT_EQ(format("%.6a", hex_value2), "0x1.081828p+3");
+ EXPECT_EQ(format("%.7a", hex_value2), "0x1.0818284p+3");
+ EXPECT_EQ(format("%.8a", hex_value2), "0x1.08182838p+3");
+ EXPECT_EQ(format("%.9a", hex_value2), "0x1.081828385p+3");
+ EXPECT_EQ(format("%.10a", hex_value2), "0x1.0818283848p+3");
+ EXPECT_EQ(format("%.11a", hex_value2), "0x1.08182838486p+3");
+ EXPECT_EQ(format("%.12a", hex_value2), "0x1.081828384858p+3");
+ EXPECT_EQ(format("%.13a", hex_value2), "0x1.0818283848586p+3");
+ EXPECT_EQ(format("%.14a", hex_value2), "0x1.08182838485860p+3");
+ EXPECT_EQ(format("%.15a", hex_value2), "0x1.081828384858600p+3");
+ EXPECT_EQ(format("%.16a", hex_value2), "0x1.0818283848586000p+3");
+ EXPECT_EQ(format("%.17a", hex_value2), "0x1.08182838485860000p+3");
+ EXPECT_EQ(format("%.18a", hex_value2), "0x1.081828384858600000p+3");
+ EXPECT_EQ(format("%.19a", hex_value2), "0x1.0818283848586000000p+3");
+ EXPECT_EQ(format("%.20a", hex_value2), "0x1.08182838485860000000p+3");
+ EXPECT_EQ(format("%.21a", hex_value2), "0x1.081828384858600000000p+3");
+}
+
+TEST_F(FormatConvertTest, LongDoubleRoundA) {
+ if (std::numeric_limits<long double>::digits % 4 != 0) {
+ // This test doesn't really make sense to run on platforms where a long
+ // double has a different mantissa size (mod 4) than Prod, since then the
+ // leading digit will be formatted differently.
+ return;
+ }
+ const NativePrintfTraits &native_traits = VerifyNativeImplementation();
+ std::string s;
+ const auto format = [&](const char *fmt, long double d) -> std::string & {
+ s.clear();
+ FormatArgImpl args[1] = {FormatArgImpl(d)};
+ AppendPack(&s, UntypedFormatSpecImpl(fmt), absl::MakeSpan(args));
+ if (native_traits.hex_float_has_glibc_rounding &&
+ native_traits.hex_float_optimizes_leading_digit_bit_count) {
+ EXPECT_EQ(StrPrint(fmt, d), s);
+ }
+ return s;
+ };
+
+ // 0x8.8p+4
+ const long double on_boundary_even = 136.0;
+ EXPECT_EQ(format("%.0La", on_boundary_even), "0x8p+4");
+ EXPECT_EQ(format("%.1La", on_boundary_even), "0x8.8p+4");
+ EXPECT_EQ(format("%.2La", on_boundary_even), "0x8.80p+4");
+ EXPECT_EQ(format("%.3La", on_boundary_even), "0x8.800p+4");
+ EXPECT_EQ(format("%.4La", on_boundary_even), "0x8.8000p+4");
+ EXPECT_EQ(format("%.5La", on_boundary_even), "0x8.80000p+4");
+ EXPECT_EQ(format("%.6La", on_boundary_even), "0x8.800000p+4");
+
+ // 0x9.8p+4
+ const long double on_boundary_odd = 152.0;
+ EXPECT_EQ(format("%.0La", on_boundary_odd), "0xap+4");
+ EXPECT_EQ(format("%.1La", on_boundary_odd), "0x9.8p+4");
+ EXPECT_EQ(format("%.2La", on_boundary_odd), "0x9.80p+4");
+ EXPECT_EQ(format("%.3La", on_boundary_odd), "0x9.800p+4");
+ EXPECT_EQ(format("%.4La", on_boundary_odd), "0x9.8000p+4");
+ EXPECT_EQ(format("%.5La", on_boundary_odd), "0x9.80000p+4");
+ EXPECT_EQ(format("%.6La", on_boundary_odd), "0x9.800000p+4");
+
+ // 0x8.80001p+24
+ const long double slightly_over = 142606352.0;
+ EXPECT_EQ(format("%.0La", slightly_over), "0x9p+24");
+ EXPECT_EQ(format("%.1La", slightly_over), "0x8.8p+24");
+ EXPECT_EQ(format("%.2La", slightly_over), "0x8.80p+24");
+ EXPECT_EQ(format("%.3La", slightly_over), "0x8.800p+24");
+ EXPECT_EQ(format("%.4La", slightly_over), "0x8.8000p+24");
+ EXPECT_EQ(format("%.5La", slightly_over), "0x8.80001p+24");
+ EXPECT_EQ(format("%.6La", slightly_over), "0x8.800010p+24");
+
+ // 0x8.7ffffp+24
+ const long double slightly_under = 142606320.0;
+ EXPECT_EQ(format("%.0La", slightly_under), "0x8p+24");
+ EXPECT_EQ(format("%.1La", slightly_under), "0x8.8p+24");
+ EXPECT_EQ(format("%.2La", slightly_under), "0x8.80p+24");
+ EXPECT_EQ(format("%.3La", slightly_under), "0x8.800p+24");
+ EXPECT_EQ(format("%.4La", slightly_under), "0x8.8000p+24");
+ EXPECT_EQ(format("%.5La", slightly_under), "0x8.7ffffp+24");
+ EXPECT_EQ(format("%.6La", slightly_under), "0x8.7ffff0p+24");
+ EXPECT_EQ(format("%.7La", slightly_under), "0x8.7ffff00p+24");
+
+ // 0xc.0828384858688000p+128
+ const long double eights = 4094231060438608800781871108094404067328.0;
+ EXPECT_EQ(format("%.0La", eights), "0xcp+128");
+ EXPECT_EQ(format("%.1La", eights), "0xc.1p+128");
+ EXPECT_EQ(format("%.2La", eights), "0xc.08p+128");
+ EXPECT_EQ(format("%.3La", eights), "0xc.083p+128");
+ EXPECT_EQ(format("%.4La", eights), "0xc.0828p+128");
+ EXPECT_EQ(format("%.5La", eights), "0xc.08284p+128");
+ EXPECT_EQ(format("%.6La", eights), "0xc.082838p+128");
+ EXPECT_EQ(format("%.7La", eights), "0xc.0828385p+128");
+ EXPECT_EQ(format("%.8La", eights), "0xc.08283848p+128");
+ EXPECT_EQ(format("%.9La", eights), "0xc.082838486p+128");
+ EXPECT_EQ(format("%.10La", eights), "0xc.0828384858p+128");
+ EXPECT_EQ(format("%.11La", eights), "0xc.08283848587p+128");
+ EXPECT_EQ(format("%.12La", eights), "0xc.082838485868p+128");
+ EXPECT_EQ(format("%.13La", eights), "0xc.0828384858688p+128");
+ EXPECT_EQ(format("%.14La", eights), "0xc.08283848586880p+128");
+ EXPECT_EQ(format("%.15La", eights), "0xc.082838485868800p+128");
+ EXPECT_EQ(format("%.16La", eights), "0xc.0828384858688000p+128");
+}
+
+// We don't actually store the results. This is just to exercise the rest of the
+// machinery.
+struct NullSink {
+ friend void AbslFormatFlush(NullSink *sink, string_view str) {}
+};
+
+template <typename... T>
+bool FormatWithNullSink(absl::string_view fmt, const T &... a) {
+ NullSink sink;
+ FormatArgImpl args[] = {FormatArgImpl(a)...};
+ return FormatUntyped(&sink, UntypedFormatSpecImpl(fmt), absl::MakeSpan(args));
+}
+
+TEST_F(FormatConvertTest, ExtremeWidthPrecision) {
+ for (const char *fmt : {"f"}) {
+ for (double d : {1e-100, 1.0, 1e100}) {
+ constexpr int max = std::numeric_limits<int>::max();
+ EXPECT_TRUE(FormatWithNullSink(std::string("%.*") + fmt, max, d));
+ EXPECT_TRUE(FormatWithNullSink(std::string("%1.*") + fmt, max, d));
+ EXPECT_TRUE(FormatWithNullSink(std::string("%*") + fmt, max, d));
+ EXPECT_TRUE(FormatWithNullSink(std::string("%*.*") + fmt, max, max, d));
+ }
+ }
+}
+
+TEST_F(FormatConvertTest, LongDouble) {
+#ifdef _MSC_VER
+ // MSVC has a different rounding policy than us so we can't test our
+ // implementation against the native one there.
+ return;
+#endif // _MSC_VER
+ const NativePrintfTraits &native_traits = VerifyNativeImplementation();
+ const char *const kFormats[] = {"%", "%.3", "%8.5", "%9", "%.5000",
+ "%.60", "%+", "% ", "%-10"};
+
+ std::vector<long double> doubles = {
+ 0.0,
+ -0.0,
+ std::numeric_limits<long double>::max(),
+ -std::numeric_limits<long double>::max(),
+ std::numeric_limits<long double>::min(),
+ -std::numeric_limits<long double>::min(),
+ std::numeric_limits<long double>::infinity(),
+ -std::numeric_limits<long double>::infinity()};
+
+ for (long double base : {1.L, 12.L, 123.L, 1234.L, 12345.L, 123456.L,
+ 1234567.L, 12345678.L, 123456789.L, 1234567890.L,
+ 12345678901.L, 123456789012.L, 1234567890123.L,
+ // This value is not representable in double, but it
+ // is in long double that uses the extended format.
+ // This is to verify that we are not truncating the
+ // value mistakenly through a double.
+ 10000000000000000.25L}) {
+ for (int exp : {-1000, -500, 0, 500, 1000}) {
+ for (int sign : {1, -1}) {
+ doubles.push_back(sign * std::ldexp(base, exp));
+ doubles.push_back(sign / std::ldexp(base, exp));
+ }
+ }
+ }
+
+ // Regression tests
+ //
+ // Using a string literal because not all platforms support hex literals or it
+ // might be out of range.
+ doubles.push_back(std::strtold("-0xf.ffffffb5feafffbp-16324L", nullptr));
+
+ for (const char *fmt : kFormats) {
+ for (char f : {'f', 'F', //
+ 'g', 'G', //
+ 'a', 'A', //
+ 'e', 'E'}) {
+ std::string fmt_str = std::string(fmt) + 'L' + f;
+
+ if (fmt == absl::string_view("%.5000") && f != 'f' && f != 'F' &&
+ f != 'a' && f != 'A') {
+ // This particular test takes way too long with snprintf.
+ // Disable for the case we are not implementing natively.
+ continue;
+ }
+
+ if (f == 'a' || f == 'A') {
+ if (!native_traits.hex_float_has_glibc_rounding ||
+ !native_traits.hex_float_optimizes_leading_digit_bit_count) {
+ continue;
+ }
+ }
+
+ for (auto d : doubles) {
+ FormatArgImpl arg(d);
+ UntypedFormatSpecImpl format(fmt_str);
+ // We use ASSERT_EQ here because failures are usually correlated and a
+ // bug would print way too many failed expectations causing the test to
+ // time out.
+ ASSERT_EQ(StrPrint(fmt_str.c_str(), d), FormatPack(format, {&arg, 1}))
+ << fmt_str << " " << StrPrint("%.18Lg", d) << " "
+ << StrPrint("%La", d) << " " << StrPrint("%.1080Lf", d);
+ }
+ }
+ }
+}
+
+TEST_F(FormatConvertTest, IntAsDouble) {
+ const NativePrintfTraits &native_traits = VerifyNativeImplementation();
+ const int kMin = std::numeric_limits<int>::min();
+ const int kMax = std::numeric_limits<int>::max();
+ const int ia[] = {
+ 1, 2, 3, 123,
+ -1, -2, -3, -123,
+ 0, kMax - 1, kMax, kMin + 1, kMin };
+ for (const int fx : ia) {
+ SCOPED_TRACE(fx);
+ const FormatArgImpl args[] = {FormatArgImpl(fx)};
+ struct Expectation {
+ int line;
+ std::string out;
+ const char *fmt;
+ };
+ const double dx = static_cast<double>(fx);
+ std::vector<Expectation> expect = {
+ {__LINE__, StrPrint("%f", dx), "%f"},
+ {__LINE__, StrPrint("%12f", dx), "%12f"},
+ {__LINE__, StrPrint("%.12f", dx), "%.12f"},
+ {__LINE__, StrPrint("%.12a", dx), "%.12a"},
+ };
+ if (native_traits.hex_float_uses_minimal_precision_when_not_specified) {
+ Expectation ex = {__LINE__, StrPrint("%12a", dx), "%12a"};
+ expect.push_back(ex);
+ }
+ for (const Expectation &e : expect) {
+ SCOPED_TRACE(e.line);
+ SCOPED_TRACE(e.fmt);
+ UntypedFormatSpecImpl format(e.fmt);
+ EXPECT_EQ(e.out, FormatPack(format, absl::MakeSpan(args)));
+ }
+ }
+}
+
+template <typename T>
+bool FormatFails(const char* test_format, T value) {
+ std::string format_string = std::string("<<") + test_format + ">>";
+ UntypedFormatSpecImpl format(format_string);
+
+ int one = 1;
+ const FormatArgImpl args[] = {FormatArgImpl(value), FormatArgImpl(one)};
+ EXPECT_EQ(FormatPack(format, absl::MakeSpan(args)), "")
+ << "format=" << test_format << " value=" << value;
+ return FormatPack(format, absl::MakeSpan(args)).empty();
+}
+
+TEST_F(FormatConvertTest, ExpectedFailures) {
+ // Int input
+ EXPECT_TRUE(FormatFails("%p", 1));
+ EXPECT_TRUE(FormatFails("%s", 1));
+ EXPECT_TRUE(FormatFails("%n", 1));
+
+ // Double input
+ EXPECT_TRUE(FormatFails("%p", 1.));
+ EXPECT_TRUE(FormatFails("%s", 1.));
+ EXPECT_TRUE(FormatFails("%n", 1.));
+ EXPECT_TRUE(FormatFails("%c", 1.));
+ EXPECT_TRUE(FormatFails("%d", 1.));
+ EXPECT_TRUE(FormatFails("%x", 1.));
+ EXPECT_TRUE(FormatFails("%*d", 1.));
+
+ // String input
+ EXPECT_TRUE(FormatFails("%n", ""));
+ EXPECT_TRUE(FormatFails("%c", ""));
+ EXPECT_TRUE(FormatFails("%d", ""));
+ EXPECT_TRUE(FormatFails("%x", ""));
+ EXPECT_TRUE(FormatFails("%f", ""));
+ EXPECT_TRUE(FormatFails("%*d", ""));
+}
+
+// Sanity check to make sure that we are testing what we think we're testing on
+// e.g. the x86_64+glibc platform.
+TEST_F(FormatConvertTest, GlibcHasCorrectTraits) {
+#if !defined(__GLIBC__) || !defined(__x86_64__)
+ return;
+#endif
+ const NativePrintfTraits &native_traits = VerifyNativeImplementation();
+ // If one of the following tests break then it is either because the above PP
+ // macro guards failed to exclude a new platform (likely) or because something
+ // has changed in the implemention of glibc sprintf float formatting behavior.
+ // If the latter, then the code that computes these flags needs to be
+ // revisited and/or possibly the StrFormat implementation.
+ EXPECT_TRUE(native_traits.hex_float_has_glibc_rounding);
+ EXPECT_TRUE(native_traits.hex_float_prefers_denormal_repr);
+ EXPECT_TRUE(
+ native_traits.hex_float_uses_minimal_precision_when_not_specified);
+ EXPECT_TRUE(native_traits.hex_float_optimizes_leading_digit_bit_count);
+}
+
+} // namespace
+} // namespace str_format_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/strings/internal/str_format/extension.cc b/third_party/abseil/src/absl/strings/internal/str_format/extension.cc
new file mode 100644
index 0000000..bb0d96c
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/internal/str_format/extension.cc
@@ -0,0 +1,75 @@
+//
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/strings/internal/str_format/extension.h"
+
+#include <errno.h>
+#include <algorithm>
+#include <string>
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace str_format_internal {
+
+std::string Flags::ToString() const {
+ std::string s;
+ s.append(left ? "-" : "");
+ s.append(show_pos ? "+" : "");
+ s.append(sign_col ? " " : "");
+ s.append(alt ? "#" : "");
+ s.append(zero ? "0" : "");
+ return s;
+}
+
+#define ABSL_INTERNAL_X_VAL(id) \
+ constexpr absl::FormatConversionChar FormatConversionCharInternal::id;
+ABSL_INTERNAL_CONVERSION_CHARS_EXPAND_(ABSL_INTERNAL_X_VAL, )
+#undef ABSL_INTERNAL_X_VAL
+// NOLINTNEXTLINE(readability-redundant-declaration)
+constexpr absl::FormatConversionChar FormatConversionCharInternal::kNone;
+
+#define ABSL_INTERNAL_CHAR_SET_CASE(c) \
+ constexpr FormatConversionCharSet FormatConversionCharSetInternal::c;
+ABSL_INTERNAL_CONVERSION_CHARS_EXPAND_(ABSL_INTERNAL_CHAR_SET_CASE, )
+#undef ABSL_INTERNAL_CHAR_SET_CASE
+
+// NOLINTNEXTLINE(readability-redundant-declaration)
+constexpr FormatConversionCharSet FormatConversionCharSetInternal::kStar;
+// NOLINTNEXTLINE(readability-redundant-declaration)
+constexpr FormatConversionCharSet FormatConversionCharSetInternal::kIntegral;
+// NOLINTNEXTLINE(readability-redundant-declaration)
+constexpr FormatConversionCharSet FormatConversionCharSetInternal::kFloating;
+// NOLINTNEXTLINE(readability-redundant-declaration)
+constexpr FormatConversionCharSet FormatConversionCharSetInternal::kNumeric;
+// NOLINTNEXTLINE(readability-redundant-declaration)
+constexpr FormatConversionCharSet FormatConversionCharSetInternal::kPointer;
+
+bool FormatSinkImpl::PutPaddedString(string_view value, int width,
+ int precision, bool left) {
+ size_t space_remaining = 0;
+ if (width >= 0) space_remaining = width;
+ size_t n = value.size();
+ if (precision >= 0) n = std::min(n, static_cast<size_t>(precision));
+ string_view shown(value.data(), n);
+ space_remaining = Excess(shown.size(), space_remaining);
+ if (!left) Append(space_remaining, ' ');
+ Append(shown);
+ if (left) Append(space_remaining, ' ');
+ return true;
+}
+
+} // namespace str_format_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/strings/internal/str_format/extension.h b/third_party/abseil/src/absl/strings/internal/str_format/extension.h
new file mode 100644
index 0000000..a9b9e13
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/internal/str_format/extension.h
@@ -0,0 +1,427 @@
+//
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+#ifndef ABSL_STRINGS_INTERNAL_STR_FORMAT_EXTENSION_H_
+#define ABSL_STRINGS_INTERNAL_STR_FORMAT_EXTENSION_H_
+
+#include <limits.h>
+
+#include <cstddef>
+#include <cstring>
+#include <ostream>
+
+#include "absl/base/config.h"
+#include "absl/base/port.h"
+#include "absl/meta/type_traits.h"
+#include "absl/strings/internal/str_format/output.h"
+#include "absl/strings/string_view.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+enum class FormatConversionChar : uint8_t;
+enum class FormatConversionCharSet : uint64_t;
+
+namespace str_format_internal {
+
+class FormatRawSinkImpl {
+ public:
+ // Implicitly convert from any type that provides the hook function as
+ // described above.
+ template <typename T, decltype(str_format_internal::InvokeFlush(
+ std::declval<T*>(), string_view()))* = nullptr>
+ FormatRawSinkImpl(T* raw) // NOLINT
+ : sink_(raw), write_(&FormatRawSinkImpl::Flush<T>) {}
+
+ void Write(string_view s) { write_(sink_, s); }
+
+ template <typename T>
+ static FormatRawSinkImpl Extract(T s) {
+ return s.sink_;
+ }
+
+ private:
+ template <typename T>
+ static void Flush(void* r, string_view s) {
+ str_format_internal::InvokeFlush(static_cast<T*>(r), s);
+ }
+
+ void* sink_;
+ void (*write_)(void*, string_view);
+};
+
+// An abstraction to which conversions write their string data.
+class FormatSinkImpl {
+ public:
+ explicit FormatSinkImpl(FormatRawSinkImpl raw) : raw_(raw) {}
+
+ ~FormatSinkImpl() { Flush(); }
+
+ void Flush() {
+ raw_.Write(string_view(buf_, pos_ - buf_));
+ pos_ = buf_;
+ }
+
+ void Append(size_t n, char c) {
+ if (n == 0) return;
+ size_ += n;
+ auto raw_append = [&](size_t count) {
+ memset(pos_, c, count);
+ pos_ += count;
+ };
+ while (n > Avail()) {
+ n -= Avail();
+ if (Avail() > 0) {
+ raw_append(Avail());
+ }
+ Flush();
+ }
+ raw_append(n);
+ }
+
+ void Append(string_view v) {
+ size_t n = v.size();
+ if (n == 0) return;
+ size_ += n;
+ if (n >= Avail()) {
+ Flush();
+ raw_.Write(v);
+ return;
+ }
+ memcpy(pos_, v.data(), n);
+ pos_ += n;
+ }
+
+ size_t size() const { return size_; }
+
+ // Put 'v' to 'sink' with specified width, precision, and left flag.
+ bool PutPaddedString(string_view v, int width, int precision, bool left);
+
+ template <typename T>
+ T Wrap() {
+ return T(this);
+ }
+
+ template <typename T>
+ static FormatSinkImpl* Extract(T* s) {
+ return s->sink_;
+ }
+
+ private:
+ size_t Avail() const { return buf_ + sizeof(buf_) - pos_; }
+
+ FormatRawSinkImpl raw_;
+ size_t size_ = 0;
+ char* pos_ = buf_;
+ char buf_[1024];
+};
+
+struct Flags {
+ bool basic : 1; // fastest conversion: no flags, width, or precision
+ bool left : 1; // "-"
+ bool show_pos : 1; // "+"
+ bool sign_col : 1; // " "
+ bool alt : 1; // "#"
+ bool zero : 1; // "0"
+ std::string ToString() const;
+ friend std::ostream& operator<<(std::ostream& os, const Flags& v) {
+ return os << v.ToString();
+ }
+};
+
+// clang-format off
+#define ABSL_INTERNAL_CONVERSION_CHARS_EXPAND_(X_VAL, X_SEP) \
+ /* text */ \
+ X_VAL(c) X_SEP X_VAL(s) X_SEP \
+ /* ints */ \
+ X_VAL(d) X_SEP X_VAL(i) X_SEP X_VAL(o) X_SEP \
+ X_VAL(u) X_SEP X_VAL(x) X_SEP X_VAL(X) X_SEP \
+ /* floats */ \
+ X_VAL(f) X_SEP X_VAL(F) X_SEP X_VAL(e) X_SEP X_VAL(E) X_SEP \
+ X_VAL(g) X_SEP X_VAL(G) X_SEP X_VAL(a) X_SEP X_VAL(A) X_SEP \
+ /* misc */ \
+ X_VAL(n) X_SEP X_VAL(p)
+// clang-format on
+
+// This type should not be referenced, it exists only to provide labels
+// internally that match the values declared in FormatConversionChar in
+// str_format.h. This is meant to allow internal libraries to use the same
+// declared interface type as the public interface
+// (absl::StrFormatConversionChar) while keeping the definition in a public
+// header.
+// Internal libraries should use the form
+// `FormatConversionCharInternal::c`, `FormatConversionCharInternal::kNone` for
+// comparisons. Use in switch statements is not recommended due to a bug in how
+// gcc 4.9 -Wswitch handles declared but undefined enums.
+struct FormatConversionCharInternal {
+ FormatConversionCharInternal() = delete;
+
+ private:
+ // clang-format off
+ enum class Enum : uint8_t {
+ c, s, // text
+ d, i, o, u, x, X, // int
+ f, F, e, E, g, G, a, A, // float
+ n, p, // misc
+ kNone
+ };
+ // clang-format on
+ public:
+#define ABSL_INTERNAL_X_VAL(id) \
+ static constexpr FormatConversionChar id = \
+ static_cast<FormatConversionChar>(Enum::id);
+ ABSL_INTERNAL_CONVERSION_CHARS_EXPAND_(ABSL_INTERNAL_X_VAL, )
+#undef ABSL_INTERNAL_X_VAL
+ static constexpr FormatConversionChar kNone =
+ static_cast<FormatConversionChar>(Enum::kNone);
+};
+// clang-format on
+
+inline FormatConversionChar FormatConversionCharFromChar(char c) {
+ switch (c) {
+#define ABSL_INTERNAL_X_VAL(id) \
+ case #id[0]: \
+ return FormatConversionCharInternal::id;
+ ABSL_INTERNAL_CONVERSION_CHARS_EXPAND_(ABSL_INTERNAL_X_VAL, )
+#undef ABSL_INTERNAL_X_VAL
+ }
+ return FormatConversionCharInternal::kNone;
+}
+
+inline bool FormatConversionCharIsUpper(FormatConversionChar c) {
+ if (c == FormatConversionCharInternal::X ||
+ c == FormatConversionCharInternal::F ||
+ c == FormatConversionCharInternal::E ||
+ c == FormatConversionCharInternal::G ||
+ c == FormatConversionCharInternal::A) {
+ return true;
+ } else {
+ return false;
+ }
+}
+
+inline bool FormatConversionCharIsFloat(FormatConversionChar c) {
+ if (c == FormatConversionCharInternal::a ||
+ c == FormatConversionCharInternal::e ||
+ c == FormatConversionCharInternal::f ||
+ c == FormatConversionCharInternal::g ||
+ c == FormatConversionCharInternal::A ||
+ c == FormatConversionCharInternal::E ||
+ c == FormatConversionCharInternal::F ||
+ c == FormatConversionCharInternal::G) {
+ return true;
+ } else {
+ return false;
+ }
+}
+
+inline char FormatConversionCharToChar(FormatConversionChar c) {
+ if (c == FormatConversionCharInternal::kNone) {
+ return '\0';
+
+#define ABSL_INTERNAL_X_VAL(e) \
+ } else if (c == FormatConversionCharInternal::e) { \
+ return #e[0];
+#define ABSL_INTERNAL_X_SEP
+ ABSL_INTERNAL_CONVERSION_CHARS_EXPAND_(ABSL_INTERNAL_X_VAL,
+ ABSL_INTERNAL_X_SEP)
+ } else {
+ return '\0';
+ }
+
+#undef ABSL_INTERNAL_X_VAL
+#undef ABSL_INTERNAL_X_SEP
+}
+
+// The associated char.
+inline std::ostream& operator<<(std::ostream& os, FormatConversionChar v) {
+ char c = FormatConversionCharToChar(v);
+ if (!c) c = '?';
+ return os << c;
+}
+
+struct FormatConversionSpecImplFriend;
+
+class FormatConversionSpecImpl {
+ public:
+ // Width and precison are not specified, no flags are set.
+ bool is_basic() const { return flags_.basic; }
+ bool has_left_flag() const { return flags_.left; }
+ bool has_show_pos_flag() const { return flags_.show_pos; }
+ bool has_sign_col_flag() const { return flags_.sign_col; }
+ bool has_alt_flag() const { return flags_.alt; }
+ bool has_zero_flag() const { return flags_.zero; }
+
+ FormatConversionChar conversion_char() const {
+ // Keep this field first in the struct . It generates better code when
+ // accessing it when ConversionSpec is passed by value in registers.
+ static_assert(offsetof(FormatConversionSpecImpl, conv_) == 0, "");
+ return conv_;
+ }
+
+ // Returns the specified width. If width is unspecfied, it returns a negative
+ // value.
+ int width() const { return width_; }
+ // Returns the specified precision. If precision is unspecfied, it returns a
+ // negative value.
+ int precision() const { return precision_; }
+
+ template <typename T>
+ T Wrap() {
+ return T(*this);
+ }
+
+ private:
+ friend struct str_format_internal::FormatConversionSpecImplFriend;
+ FormatConversionChar conv_ = FormatConversionCharInternal::kNone;
+ Flags flags_;
+ int width_;
+ int precision_;
+};
+
+struct FormatConversionSpecImplFriend final {
+ static void SetFlags(Flags f, FormatConversionSpecImpl* conv) {
+ conv->flags_ = f;
+ }
+ static void SetConversionChar(FormatConversionChar c,
+ FormatConversionSpecImpl* conv) {
+ conv->conv_ = c;
+ }
+ static void SetWidth(int w, FormatConversionSpecImpl* conv) {
+ conv->width_ = w;
+ }
+ static void SetPrecision(int p, FormatConversionSpecImpl* conv) {
+ conv->precision_ = p;
+ }
+ static std::string FlagsToString(const FormatConversionSpecImpl& spec) {
+ return spec.flags_.ToString();
+ }
+};
+
+// Type safe OR operator.
+// We need this for two reasons:
+// 1. operator| on enums makes them decay to integers and the result is an
+// integer. We need the result to stay as an enum.
+// 2. We use "enum class" which would not work even if we accepted the decay.
+constexpr FormatConversionCharSet FormatConversionCharSetUnion(
+ FormatConversionCharSet a) {
+ return a;
+}
+
+template <typename... CharSet>
+constexpr FormatConversionCharSet FormatConversionCharSetUnion(
+ FormatConversionCharSet a, CharSet... rest) {
+ return static_cast<FormatConversionCharSet>(
+ static_cast<uint64_t>(a) |
+ static_cast<uint64_t>(FormatConversionCharSetUnion(rest...)));
+}
+
+constexpr uint64_t FormatConversionCharToConvInt(FormatConversionChar c) {
+ return uint64_t{1} << (1 + static_cast<uint8_t>(c));
+}
+
+constexpr uint64_t FormatConversionCharToConvInt(char conv) {
+ return
+#define ABSL_INTERNAL_CHAR_SET_CASE(c) \
+ conv == #c[0] \
+ ? FormatConversionCharToConvInt(FormatConversionCharInternal::c) \
+ :
+ ABSL_INTERNAL_CONVERSION_CHARS_EXPAND_(ABSL_INTERNAL_CHAR_SET_CASE, )
+#undef ABSL_INTERNAL_CHAR_SET_CASE
+ conv == '*'
+ ? 1
+ : 0;
+}
+
+constexpr FormatConversionCharSet FormatConversionCharToConvValue(char conv) {
+ return static_cast<FormatConversionCharSet>(
+ FormatConversionCharToConvInt(conv));
+}
+
+struct FormatConversionCharSetInternal {
+#define ABSL_INTERNAL_CHAR_SET_CASE(c) \
+ static constexpr FormatConversionCharSet c = \
+ FormatConversionCharToConvValue(#c[0]);
+ ABSL_INTERNAL_CONVERSION_CHARS_EXPAND_(ABSL_INTERNAL_CHAR_SET_CASE, )
+#undef ABSL_INTERNAL_CHAR_SET_CASE
+
+ // Used for width/precision '*' specification.
+ static constexpr FormatConversionCharSet kStar =
+ FormatConversionCharToConvValue('*');
+
+ static constexpr FormatConversionCharSet kIntegral =
+ FormatConversionCharSetUnion(d, i, u, o, x, X);
+ static constexpr FormatConversionCharSet kFloating =
+ FormatConversionCharSetUnion(a, e, f, g, A, E, F, G);
+ static constexpr FormatConversionCharSet kNumeric =
+ FormatConversionCharSetUnion(kIntegral, kFloating);
+ static constexpr FormatConversionCharSet kPointer = p;
+};
+
+// Type safe OR operator.
+// We need this for two reasons:
+// 1. operator| on enums makes them decay to integers and the result is an
+// integer. We need the result to stay as an enum.
+// 2. We use "enum class" which would not work even if we accepted the decay.
+constexpr FormatConversionCharSet operator|(FormatConversionCharSet a,
+ FormatConversionCharSet b) {
+ return FormatConversionCharSetUnion(a, b);
+}
+
+// Overloaded conversion functions to support absl::ParsedFormat.
+// Get a conversion with a single character in it.
+constexpr FormatConversionCharSet ToFormatConversionCharSet(char c) {
+ return static_cast<FormatConversionCharSet>(
+ FormatConversionCharToConvValue(c));
+}
+
+// Get a conversion with a single character in it.
+constexpr FormatConversionCharSet ToFormatConversionCharSet(
+ FormatConversionCharSet c) {
+ return c;
+}
+
+template <typename T>
+void ToFormatConversionCharSet(T) = delete;
+
+// Checks whether `c` exists in `set`.
+constexpr bool Contains(FormatConversionCharSet set, char c) {
+ return (static_cast<uint64_t>(set) &
+ static_cast<uint64_t>(FormatConversionCharToConvValue(c))) != 0;
+}
+
+// Checks whether all the characters in `c` are contained in `set`
+constexpr bool Contains(FormatConversionCharSet set,
+ FormatConversionCharSet c) {
+ return (static_cast<uint64_t>(set) & static_cast<uint64_t>(c)) ==
+ static_cast<uint64_t>(c);
+}
+
+// Checks whether all the characters in `c` are contained in `set`
+constexpr bool Contains(FormatConversionCharSet set, FormatConversionChar c) {
+ return (static_cast<uint64_t>(set) & FormatConversionCharToConvInt(c)) != 0;
+}
+
+// Return capacity - used, clipped to a minimum of 0.
+inline size_t Excess(size_t used, size_t capacity) {
+ return used < capacity ? capacity - used : 0;
+}
+
+} // namespace str_format_internal
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_STRINGS_INTERNAL_STR_FORMAT_EXTENSION_H_
diff --git a/third_party/abseil/src/absl/strings/internal/str_format/extension_test.cc b/third_party/abseil/src/absl/strings/internal/str_format/extension_test.cc
new file mode 100644
index 0000000..1c93fdb
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/internal/str_format/extension_test.cc
@@ -0,0 +1,98 @@
+//
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+#include "absl/strings/internal/str_format/extension.h"
+
+#include <random>
+#include <string>
+
+#include "gtest/gtest.h"
+#include "absl/strings/str_format.h"
+#include "absl/strings/string_view.h"
+
+namespace my_namespace {
+class UserDefinedType {
+ public:
+ UserDefinedType() = default;
+
+ void Append(absl::string_view str) { value_.append(str.data(), str.size()); }
+ const std::string& Value() const { return value_; }
+
+ friend void AbslFormatFlush(UserDefinedType* x, absl::string_view str) {
+ x->Append(str);
+ }
+
+ private:
+ std::string value_;
+};
+} // namespace my_namespace
+
+namespace {
+
+std::string MakeRandomString(size_t len) {
+ std::random_device rd;
+ std::mt19937 gen(rd());
+ std::uniform_int_distribution<> dis('a', 'z');
+ std::string s(len, '0');
+ for (char& c : s) {
+ c = dis(gen);
+ }
+ return s;
+}
+
+TEST(FormatExtensionTest, SinkAppendSubstring) {
+ for (size_t chunk_size : {1, 10, 100, 1000, 10000}) {
+ std::string expected, actual;
+ absl::str_format_internal::FormatSinkImpl sink(&actual);
+ for (size_t chunks = 0; chunks < 10; ++chunks) {
+ std::string rand = MakeRandomString(chunk_size);
+ expected += rand;
+ sink.Append(rand);
+ }
+ sink.Flush();
+ EXPECT_EQ(actual, expected);
+ }
+}
+
+TEST(FormatExtensionTest, SinkAppendChars) {
+ for (size_t chunk_size : {1, 10, 100, 1000, 10000}) {
+ std::string expected, actual;
+ absl::str_format_internal::FormatSinkImpl sink(&actual);
+ for (size_t chunks = 0; chunks < 10; ++chunks) {
+ std::string rand = MakeRandomString(1);
+ expected.append(chunk_size, rand[0]);
+ sink.Append(chunk_size, rand[0]);
+ }
+ sink.Flush();
+ EXPECT_EQ(actual, expected);
+ }
+}
+
+TEST(FormatExtensionTest, VerifyEnumEquality) {
+#define X_VAL(id) \
+ EXPECT_EQ(absl::FormatConversionChar::id, \
+ absl::str_format_internal::FormatConversionCharInternal::id);
+ ABSL_INTERNAL_CONVERSION_CHARS_EXPAND_(X_VAL, );
+#undef X_VAL
+
+#define X_VAL(id) \
+ EXPECT_EQ(absl::FormatConversionCharSet::id, \
+ absl::str_format_internal::FormatConversionCharSetInternal::id);
+ ABSL_INTERNAL_CONVERSION_CHARS_EXPAND_(X_VAL, );
+#undef X_VAL
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/strings/internal/str_format/float_conversion.cc b/third_party/abseil/src/absl/strings/internal/str_format/float_conversion.cc
new file mode 100644
index 0000000..0ded0a6
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/internal/str_format/float_conversion.cc
@@ -0,0 +1,1419 @@
+// Copyright 2020 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/strings/internal/str_format/float_conversion.h"
+
+#include <string.h>
+
+#include <algorithm>
+#include <cassert>
+#include <cmath>
+#include <limits>
+#include <string>
+
+#include "absl/base/attributes.h"
+#include "absl/base/config.h"
+#include "absl/base/internal/bits.h"
+#include "absl/base/optimization.h"
+#include "absl/functional/function_ref.h"
+#include "absl/meta/type_traits.h"
+#include "absl/numeric/int128.h"
+#include "absl/strings/numbers.h"
+#include "absl/types/optional.h"
+#include "absl/types/span.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace str_format_internal {
+
+namespace {
+
+// The code below wants to avoid heap allocations.
+// To do so it needs to allocate memory on the stack.
+// `StackArray` will allocate memory on the stack in the form of a uint32_t
+// array and call the provided callback with said memory.
+// It will allocate memory in increments of 512 bytes. We could allocate the
+// largest needed unconditionally, but that is more than we need in most of
+// cases. This way we use less stack in the common cases.
+class StackArray {
+ using Func = absl::FunctionRef<void(absl::Span<uint32_t>)>;
+ static constexpr size_t kStep = 512 / sizeof(uint32_t);
+ // 5 steps is 2560 bytes, which is enough to hold a long double with the
+ // largest/smallest exponents.
+ // The operations below will static_assert their particular maximum.
+ static constexpr size_t kNumSteps = 5;
+
+ // We do not want this function to be inlined.
+ // Otherwise the caller will allocate the stack space unnecessarily for all
+ // the variants even though it only calls one.
+ template <size_t steps>
+ ABSL_ATTRIBUTE_NOINLINE static void RunWithCapacityImpl(Func f) {
+ uint32_t values[steps * kStep]{};
+ f(absl::MakeSpan(values));
+ }
+
+ public:
+ static constexpr size_t kMaxCapacity = kStep * kNumSteps;
+
+ static void RunWithCapacity(size_t capacity, Func f) {
+ assert(capacity <= kMaxCapacity);
+ const size_t step = (capacity + kStep - 1) / kStep;
+ assert(step <= kNumSteps);
+ switch (step) {
+ case 1:
+ return RunWithCapacityImpl<1>(f);
+ case 2:
+ return RunWithCapacityImpl<2>(f);
+ case 3:
+ return RunWithCapacityImpl<3>(f);
+ case 4:
+ return RunWithCapacityImpl<4>(f);
+ case 5:
+ return RunWithCapacityImpl<5>(f);
+ }
+
+ assert(false && "Invalid capacity");
+ }
+};
+
+// Calculates `10 * (*v) + carry` and stores the result in `*v` and returns
+// the carry.
+template <typename Int>
+inline Int MultiplyBy10WithCarry(Int *v, Int carry) {
+ using BiggerInt = absl::conditional_t<sizeof(Int) == 4, uint64_t, uint128>;
+ BiggerInt tmp = 10 * static_cast<BiggerInt>(*v) + carry;
+ *v = static_cast<Int>(tmp);
+ return static_cast<Int>(tmp >> (sizeof(Int) * 8));
+}
+
+// Calculates `(2^64 * carry + *v) / 10`.
+// Stores the quotient in `*v` and returns the remainder.
+// Requires: `0 <= carry <= 9`
+inline uint64_t DivideBy10WithCarry(uint64_t *v, uint64_t carry) {
+ constexpr uint64_t divisor = 10;
+ // 2^64 / divisor = chunk_quotient + chunk_remainder / divisor
+ constexpr uint64_t chunk_quotient = (uint64_t{1} << 63) / (divisor / 2);
+ constexpr uint64_t chunk_remainder = uint64_t{} - chunk_quotient * divisor;
+
+ const uint64_t mod = *v % divisor;
+ const uint64_t next_carry = chunk_remainder * carry + mod;
+ *v = *v / divisor + carry * chunk_quotient + next_carry / divisor;
+ return next_carry % divisor;
+}
+
+// Generates the decimal representation for an integer of the form `v * 2^exp`,
+// where `v` and `exp` are both positive integers.
+// It generates the digits from the left (ie the most significant digit first)
+// to allow for direct printing into the sink.
+//
+// Requires `0 <= exp` and `exp <= numeric_limits<long double>::max_exponent`.
+class BinaryToDecimal {
+ static constexpr int ChunksNeeded(int exp) {
+ // We will left shift a uint128 by `exp` bits, so we need `128+exp` total
+ // bits. Round up to 32.
+ // See constructor for details about adding `10%` to the value.
+ return (128 + exp + 31) / 32 * 11 / 10;
+ }
+
+ public:
+ // Run the conversion for `v * 2^exp` and call `f(binary_to_decimal)`.
+ // This function will allocate enough stack space to perform the conversion.
+ static void RunConversion(uint128 v, int exp,
+ absl::FunctionRef<void(BinaryToDecimal)> f) {
+ assert(exp > 0);
+ assert(exp <= std::numeric_limits<long double>::max_exponent);
+ static_assert(
+ static_cast<int>(StackArray::kMaxCapacity) >=
+ ChunksNeeded(std::numeric_limits<long double>::max_exponent),
+ "");
+
+ StackArray::RunWithCapacity(
+ ChunksNeeded(exp),
+ [=](absl::Span<uint32_t> input) { f(BinaryToDecimal(input, v, exp)); });
+ }
+
+ int TotalDigits() const {
+ return static_cast<int>((decimal_end_ - decimal_start_) * kDigitsPerChunk +
+ CurrentDigits().size());
+ }
+
+ // See the current block of digits.
+ absl::string_view CurrentDigits() const {
+ return absl::string_view(digits_ + kDigitsPerChunk - size_, size_);
+ }
+
+ // Advance the current view of digits.
+ // Returns `false` when no more digits are available.
+ bool AdvanceDigits() {
+ if (decimal_start_ >= decimal_end_) return false;
+
+ uint32_t w = data_[decimal_start_++];
+ for (size_ = 0; size_ < kDigitsPerChunk; w /= 10) {
+ digits_[kDigitsPerChunk - ++size_] = w % 10 + '0';
+ }
+ return true;
+ }
+
+ private:
+ BinaryToDecimal(absl::Span<uint32_t> data, uint128 v, int exp) : data_(data) {
+ // We need to print the digits directly into the sink object without
+ // buffering them all first. To do this we need two things:
+ // - to know the total number of digits to do padding when necessary
+ // - to generate the decimal digits from the left.
+ //
+ // In order to do this, we do a two pass conversion.
+ // On the first pass we convert the binary representation of the value into
+ // a decimal representation in which each uint32_t chunk holds up to 9
+ // decimal digits. In the second pass we take each decimal-holding-uint32_t
+ // value and generate the ascii decimal digits into `digits_`.
+ //
+ // The binary and decimal representations actually share the same memory
+ // region. As we go converting the chunks from binary to decimal we free
+ // them up and reuse them for the decimal representation. One caveat is that
+ // the decimal representation is around 7% less efficient in space than the
+ // binary one. We allocate an extra 10% memory to account for this. See
+ // ChunksNeeded for this calculation.
+ int chunk_index = exp / 32;
+ decimal_start_ = decimal_end_ = ChunksNeeded(exp);
+ const int offset = exp % 32;
+ // Left shift v by exp bits.
+ data_[chunk_index] = static_cast<uint32_t>(v << offset);
+ for (v >>= (32 - offset); v; v >>= 32)
+ data_[++chunk_index] = static_cast<uint32_t>(v);
+
+ while (chunk_index >= 0) {
+ // While we have more than one chunk available, go in steps of 1e9.
+ // `data_[chunk_index]` holds the highest non-zero binary chunk, so keep
+ // the variable updated.
+ uint32_t carry = 0;
+ for (int i = chunk_index; i >= 0; --i) {
+ uint64_t tmp = uint64_t{data_[i]} + (uint64_t{carry} << 32);
+ data_[i] = static_cast<uint32_t>(tmp / uint64_t{1000000000});
+ carry = static_cast<uint32_t>(tmp % uint64_t{1000000000});
+ }
+
+ // If the highest chunk is now empty, remove it from view.
+ if (data_[chunk_index] == 0) --chunk_index;
+
+ --decimal_start_;
+ assert(decimal_start_ != chunk_index);
+ data_[decimal_start_] = carry;
+ }
+
+ // Fill the first set of digits. The first chunk might not be complete, so
+ // handle differently.
+ for (uint32_t first = data_[decimal_start_++]; first != 0; first /= 10) {
+ digits_[kDigitsPerChunk - ++size_] = first % 10 + '0';
+ }
+ }
+
+ private:
+ static constexpr int kDigitsPerChunk = 9;
+
+ int decimal_start_;
+ int decimal_end_;
+
+ char digits_[kDigitsPerChunk];
+ int size_ = 0;
+
+ absl::Span<uint32_t> data_;
+};
+
+// Converts a value of the form `x * 2^-exp` into a sequence of decimal digits.
+// Requires `-exp < 0` and
+// `-exp >= limits<long double>::min_exponent - limits<long double>::digits`.
+class FractionalDigitGenerator {
+ public:
+ // Run the conversion for `v * 2^exp` and call `f(generator)`.
+ // This function will allocate enough stack space to perform the conversion.
+ static void RunConversion(
+ uint128 v, int exp, absl::FunctionRef<void(FractionalDigitGenerator)> f) {
+ using Limits = std::numeric_limits<long double>;
+ assert(-exp < 0);
+ assert(-exp >= Limits::min_exponent - 128);
+ static_assert(StackArray::kMaxCapacity >=
+ (Limits::digits + 128 - Limits::min_exponent + 31) / 32,
+ "");
+ StackArray::RunWithCapacity((Limits::digits + exp + 31) / 32,
+ [=](absl::Span<uint32_t> input) {
+ f(FractionalDigitGenerator(input, v, exp));
+ });
+ }
+
+ // Returns true if there are any more non-zero digits left.
+ bool HasMoreDigits() const { return next_digit_ != 0 || chunk_index_ >= 0; }
+
+ // Returns true if the remainder digits are greater than 5000...
+ bool IsGreaterThanHalf() const {
+ return next_digit_ > 5 || (next_digit_ == 5 && chunk_index_ >= 0);
+ }
+ // Returns true if the remainder digits are exactly 5000...
+ bool IsExactlyHalf() const { return next_digit_ == 5 && chunk_index_ < 0; }
+
+ struct Digits {
+ int digit_before_nine;
+ int num_nines;
+ };
+
+ // Get the next set of digits.
+ // They are composed by a non-9 digit followed by a runs of zero or more 9s.
+ Digits GetDigits() {
+ Digits digits{next_digit_, 0};
+
+ next_digit_ = GetOneDigit();
+ while (next_digit_ == 9) {
+ ++digits.num_nines;
+ next_digit_ = GetOneDigit();
+ }
+
+ return digits;
+ }
+
+ private:
+ // Return the next digit.
+ int GetOneDigit() {
+ if (chunk_index_ < 0) return 0;
+
+ uint32_t carry = 0;
+ for (int i = chunk_index_; i >= 0; --i) {
+ carry = MultiplyBy10WithCarry(&data_[i], carry);
+ }
+ // If the lowest chunk is now empty, remove it from view.
+ if (data_[chunk_index_] == 0) --chunk_index_;
+ return carry;
+ }
+
+ FractionalDigitGenerator(absl::Span<uint32_t> data, uint128 v, int exp)
+ : chunk_index_(exp / 32), data_(data) {
+ const int offset = exp % 32;
+ // Right shift `v` by `exp` bits.
+ data_[chunk_index_] = static_cast<uint32_t>(v << (32 - offset));
+ v >>= offset;
+ // Make sure we don't overflow the data. We already calculated that
+ // non-zero bits fit, so we might not have space for leading zero bits.
+ for (int pos = chunk_index_; v; v >>= 32)
+ data_[--pos] = static_cast<uint32_t>(v);
+
+ // Fill next_digit_, as GetDigits expects it to be populated always.
+ next_digit_ = GetOneDigit();
+ }
+
+ int next_digit_;
+ int chunk_index_;
+ absl::Span<uint32_t> data_;
+};
+
+// Count the number of leading zero bits.
+int LeadingZeros(uint64_t v) { return base_internal::CountLeadingZeros64(v); }
+int LeadingZeros(uint128 v) {
+ auto high = static_cast<uint64_t>(v >> 64);
+ auto low = static_cast<uint64_t>(v);
+ return high != 0 ? base_internal::CountLeadingZeros64(high)
+ : 64 + base_internal::CountLeadingZeros64(low);
+}
+
+// Round up the text digits starting at `p`.
+// The buffer must have an extra digit that is known to not need rounding.
+// This is done below by having an extra '0' digit on the left.
+void RoundUp(char *p) {
+ while (*p == '9' || *p == '.') {
+ if (*p == '9') *p = '0';
+ --p;
+ }
+ ++*p;
+}
+
+// Check the previous digit and round up or down to follow the round-to-even
+// policy.
+void RoundToEven(char *p) {
+ if (*p == '.') --p;
+ if (*p % 2 == 1) RoundUp(p);
+}
+
+// Simple integral decimal digit printing for values that fit in 64-bits.
+// Returns the pointer to the last written digit.
+char *PrintIntegralDigitsFromRightFast(uint64_t v, char *p) {
+ do {
+ *--p = DivideBy10WithCarry(&v, 0) + '0';
+ } while (v != 0);
+ return p;
+}
+
+// Simple integral decimal digit printing for values that fit in 128-bits.
+// Returns the pointer to the last written digit.
+char *PrintIntegralDigitsFromRightFast(uint128 v, char *p) {
+ auto high = static_cast<uint64_t>(v >> 64);
+ auto low = static_cast<uint64_t>(v);
+
+ while (high != 0) {
+ uint64_t carry = DivideBy10WithCarry(&high, 0);
+ carry = DivideBy10WithCarry(&low, carry);
+ *--p = carry + '0';
+ }
+ return PrintIntegralDigitsFromRightFast(low, p);
+}
+
+// Simple fractional decimal digit printing for values that fir in 64-bits after
+// shifting.
+// Performs rounding if necessary to fit within `precision`.
+// Returns the pointer to one after the last character written.
+char *PrintFractionalDigitsFast(uint64_t v, char *start, int exp,
+ int precision) {
+ char *p = start;
+ v <<= (64 - exp);
+ while (precision > 0) {
+ if (!v) return p;
+ *p++ = MultiplyBy10WithCarry(&v, uint64_t{0}) + '0';
+ --precision;
+ }
+
+ // We need to round.
+ if (v < 0x8000000000000000) {
+ // We round down, so nothing to do.
+ } else if (v > 0x8000000000000000) {
+ // We round up.
+ RoundUp(p - 1);
+ } else {
+ RoundToEven(p - 1);
+ }
+
+ assert(precision == 0);
+ // Precision can only be zero here.
+ return p;
+}
+
+// Simple fractional decimal digit printing for values that fir in 128-bits
+// after shifting.
+// Performs rounding if necessary to fit within `precision`.
+// Returns the pointer to one after the last character written.
+char *PrintFractionalDigitsFast(uint128 v, char *start, int exp,
+ int precision) {
+ char *p = start;
+ v <<= (128 - exp);
+ auto high = static_cast<uint64_t>(v >> 64);
+ auto low = static_cast<uint64_t>(v);
+
+ // While we have digits to print and `low` is not empty, do the long
+ // multiplication.
+ while (precision > 0 && low != 0) {
+ uint64_t carry = MultiplyBy10WithCarry(&low, uint64_t{0});
+ carry = MultiplyBy10WithCarry(&high, carry);
+
+ *p++ = carry + '0';
+ --precision;
+ }
+
+ // Now `low` is empty, so use a faster approach for the rest of the digits.
+ // This block is pretty much the same as the main loop for the 64-bit case
+ // above.
+ while (precision > 0) {
+ if (!high) return p;
+ *p++ = MultiplyBy10WithCarry(&high, uint64_t{0}) + '0';
+ --precision;
+ }
+
+ // We need to round.
+ if (high < 0x8000000000000000) {
+ // We round down, so nothing to do.
+ } else if (high > 0x8000000000000000 || low != 0) {
+ // We round up.
+ RoundUp(p - 1);
+ } else {
+ RoundToEven(p - 1);
+ }
+
+ assert(precision == 0);
+ // Precision can only be zero here.
+ return p;
+}
+
+struct FormatState {
+ char sign_char;
+ int precision;
+ const FormatConversionSpecImpl &conv;
+ FormatSinkImpl *sink;
+
+ // In `alt` mode (flag #) we keep the `.` even if there are no fractional
+ // digits. In non-alt mode, we strip it.
+ bool ShouldPrintDot() const { return precision != 0 || conv.has_alt_flag(); }
+};
+
+struct Padding {
+ int left_spaces;
+ int zeros;
+ int right_spaces;
+};
+
+Padding ExtraWidthToPadding(size_t total_size, const FormatState &state) {
+ if (state.conv.width() < 0 ||
+ static_cast<size_t>(state.conv.width()) <= total_size) {
+ return {0, 0, 0};
+ }
+ int missing_chars = state.conv.width() - total_size;
+ if (state.conv.has_left_flag()) {
+ return {0, 0, missing_chars};
+ } else if (state.conv.has_zero_flag()) {
+ return {0, missing_chars, 0};
+ } else {
+ return {missing_chars, 0, 0};
+ }
+}
+
+void FinalPrint(const FormatState &state, absl::string_view data,
+ int padding_offset, int trailing_zeros,
+ absl::string_view data_postfix) {
+ if (state.conv.width() < 0) {
+ // No width specified. Fast-path.
+ if (state.sign_char != '\0') state.sink->Append(1, state.sign_char);
+ state.sink->Append(data);
+ state.sink->Append(trailing_zeros, '0');
+ state.sink->Append(data_postfix);
+ return;
+ }
+
+ auto padding = ExtraWidthToPadding((state.sign_char != '\0' ? 1 : 0) +
+ data.size() + data_postfix.size() +
+ static_cast<size_t>(trailing_zeros),
+ state);
+
+ state.sink->Append(padding.left_spaces, ' ');
+ if (state.sign_char != '\0') state.sink->Append(1, state.sign_char);
+ // Padding in general needs to be inserted somewhere in the middle of `data`.
+ state.sink->Append(data.substr(0, padding_offset));
+ state.sink->Append(padding.zeros, '0');
+ state.sink->Append(data.substr(padding_offset));
+ state.sink->Append(trailing_zeros, '0');
+ state.sink->Append(data_postfix);
+ state.sink->Append(padding.right_spaces, ' ');
+}
+
+// Fastpath %f formatter for when the shifted value fits in a simple integral
+// type.
+// Prints `v*2^exp` with the options from `state`.
+template <typename Int>
+void FormatFFast(Int v, int exp, const FormatState &state) {
+ constexpr int input_bits = sizeof(Int) * 8;
+
+ static constexpr size_t integral_size =
+ /* in case we need to round up an extra digit */ 1 +
+ /* decimal digits for uint128 */ 40 + 1;
+ char buffer[integral_size + /* . */ 1 + /* max digits uint128 */ 128];
+ buffer[integral_size] = '.';
+ char *const integral_digits_end = buffer + integral_size;
+ char *integral_digits_start;
+ char *const fractional_digits_start = buffer + integral_size + 1;
+ char *fractional_digits_end = fractional_digits_start;
+
+ if (exp >= 0) {
+ const int total_bits = input_bits - LeadingZeros(v) + exp;
+ integral_digits_start =
+ total_bits <= 64
+ ? PrintIntegralDigitsFromRightFast(static_cast<uint64_t>(v) << exp,
+ integral_digits_end)
+ : PrintIntegralDigitsFromRightFast(static_cast<uint128>(v) << exp,
+ integral_digits_end);
+ } else {
+ exp = -exp;
+
+ integral_digits_start = PrintIntegralDigitsFromRightFast(
+ exp < input_bits ? v >> exp : 0, integral_digits_end);
+ // PrintFractionalDigits may pull a carried 1 all the way up through the
+ // integral portion.
+ integral_digits_start[-1] = '0';
+
+ fractional_digits_end =
+ exp <= 64 ? PrintFractionalDigitsFast(v, fractional_digits_start, exp,
+ state.precision)
+ : PrintFractionalDigitsFast(static_cast<uint128>(v),
+ fractional_digits_start, exp,
+ state.precision);
+ // There was a carry, so include the first digit too.
+ if (integral_digits_start[-1] != '0') --integral_digits_start;
+ }
+
+ size_t size = fractional_digits_end - integral_digits_start;
+
+ // In `alt` mode (flag #) we keep the `.` even if there are no fractional
+ // digits. In non-alt mode, we strip it.
+ if (!state.ShouldPrintDot()) --size;
+ FinalPrint(state, absl::string_view(integral_digits_start, size),
+ /*padding_offset=*/0,
+ static_cast<int>(state.precision - (fractional_digits_end -
+ fractional_digits_start)),
+ /*data_postfix=*/"");
+}
+
+// Slow %f formatter for when the shifted value does not fit in a uint128, and
+// `exp > 0`.
+// Prints `v*2^exp` with the options from `state`.
+// This one is guaranteed to not have fractional digits, so we don't have to
+// worry about anything after the `.`.
+void FormatFPositiveExpSlow(uint128 v, int exp, const FormatState &state) {
+ BinaryToDecimal::RunConversion(v, exp, [&](BinaryToDecimal btd) {
+ const size_t total_digits =
+ btd.TotalDigits() +
+ (state.ShouldPrintDot() ? static_cast<size_t>(state.precision) + 1 : 0);
+
+ const auto padding = ExtraWidthToPadding(
+ total_digits + (state.sign_char != '\0' ? 1 : 0), state);
+
+ state.sink->Append(padding.left_spaces, ' ');
+ if (state.sign_char != '\0') state.sink->Append(1, state.sign_char);
+ state.sink->Append(padding.zeros, '0');
+
+ do {
+ state.sink->Append(btd.CurrentDigits());
+ } while (btd.AdvanceDigits());
+
+ if (state.ShouldPrintDot()) state.sink->Append(1, '.');
+ state.sink->Append(state.precision, '0');
+ state.sink->Append(padding.right_spaces, ' ');
+ });
+}
+
+// Slow %f formatter for when the shifted value does not fit in a uint128, and
+// `exp < 0`.
+// Prints `v*2^exp` with the options from `state`.
+// This one is guaranteed to be < 1.0, so we don't have to worry about integral
+// digits.
+void FormatFNegativeExpSlow(uint128 v, int exp, const FormatState &state) {
+ const size_t total_digits =
+ /* 0 */ 1 +
+ (state.ShouldPrintDot() ? static_cast<size_t>(state.precision) + 1 : 0);
+ auto padding =
+ ExtraWidthToPadding(total_digits + (state.sign_char ? 1 : 0), state);
+ padding.zeros += 1;
+ state.sink->Append(padding.left_spaces, ' ');
+ if (state.sign_char != '\0') state.sink->Append(1, state.sign_char);
+ state.sink->Append(padding.zeros, '0');
+
+ if (state.ShouldPrintDot()) state.sink->Append(1, '.');
+
+ // Print digits
+ int digits_to_go = state.precision;
+
+ FractionalDigitGenerator::RunConversion(
+ v, exp, [&](FractionalDigitGenerator digit_gen) {
+ // There are no digits to print here.
+ if (state.precision == 0) return;
+
+ // We go one digit at a time, while keeping track of runs of nines.
+ // The runs of nines are used to perform rounding when necessary.
+
+ while (digits_to_go > 0 && digit_gen.HasMoreDigits()) {
+ auto digits = digit_gen.GetDigits();
+
+ // Now we have a digit and a run of nines.
+ // See if we can print them all.
+ if (digits.num_nines + 1 < digits_to_go) {
+ // We don't have to round yet, so print them.
+ state.sink->Append(1, digits.digit_before_nine + '0');
+ state.sink->Append(digits.num_nines, '9');
+ digits_to_go -= digits.num_nines + 1;
+
+ } else {
+ // We can't print all the nines, see where we have to truncate.
+
+ bool round_up = false;
+ if (digits.num_nines + 1 > digits_to_go) {
+ // We round up at a nine. No need to print them.
+ round_up = true;
+ } else {
+ // We can fit all the nines, but truncate just after it.
+ if (digit_gen.IsGreaterThanHalf()) {
+ round_up = true;
+ } else if (digit_gen.IsExactlyHalf()) {
+ // Round to even
+ round_up =
+ digits.num_nines != 0 || digits.digit_before_nine % 2 == 1;
+ }
+ }
+
+ if (round_up) {
+ state.sink->Append(1, digits.digit_before_nine + '1');
+ --digits_to_go;
+ // The rest will be zeros.
+ } else {
+ state.sink->Append(1, digits.digit_before_nine + '0');
+ state.sink->Append(digits_to_go - 1, '9');
+ digits_to_go = 0;
+ }
+ return;
+ }
+ }
+ });
+
+ state.sink->Append(digits_to_go, '0');
+ state.sink->Append(padding.right_spaces, ' ');
+}
+
+template <typename Int>
+void FormatF(Int mantissa, int exp, const FormatState &state) {
+ if (exp >= 0) {
+ const int total_bits = sizeof(Int) * 8 - LeadingZeros(mantissa) + exp;
+
+ // Fallback to the slow stack-based approach if we can't do it in a 64 or
+ // 128 bit state.
+ if (ABSL_PREDICT_FALSE(total_bits > 128)) {
+ return FormatFPositiveExpSlow(mantissa, exp, state);
+ }
+ } else {
+ // Fallback to the slow stack-based approach if we can't do it in a 64 or
+ // 128 bit state.
+ if (ABSL_PREDICT_FALSE(exp < -128)) {
+ return FormatFNegativeExpSlow(mantissa, -exp, state);
+ }
+ }
+ return FormatFFast(mantissa, exp, state);
+}
+
+// Grab the group of four bits (nibble) from `n`. E.g., nibble 1 corresponds to
+// bits 4-7.
+template <typename Int>
+uint8_t GetNibble(Int n, int nibble_index) {
+ constexpr Int mask_low_nibble = Int{0xf};
+ int shift = nibble_index * 4;
+ n &= mask_low_nibble << shift;
+ return static_cast<uint8_t>((n >> shift) & 0xf);
+}
+
+// Add one to the given nibble, applying carry to higher nibbles. Returns true
+// if overflow, false otherwise.
+template <typename Int>
+bool IncrementNibble(int nibble_index, Int *n) {
+ constexpr int kShift = sizeof(Int) * 8 - 1;
+ constexpr int kNumNibbles = sizeof(Int) * 8 / 4;
+ Int before = *n >> kShift;
+ // Here we essentially want to take the number 1 and move it into the requsted
+ // nibble, then add it to *n to effectively increment the nibble. However,
+ // ASan will complain if we try to shift the 1 beyond the limits of the Int,
+ // i.e., if the nibble_index is out of range. So therefore we check for this
+ // and if we are out of range we just add 0 which leaves *n unchanged, which
+ // seems like the reasonable thing to do in that case.
+ *n += ((nibble_index >= kNumNibbles) ? 0 : (Int{1} << (nibble_index * 4)));
+ Int after = *n >> kShift;
+ return (before && !after) || (nibble_index >= kNumNibbles);
+}
+
+// Return a mask with 1's in the given nibble and all lower nibbles.
+template <typename Int>
+Int MaskUpToNibbleInclusive(int nibble_index) {
+ constexpr int kNumNibbles = sizeof(Int) * 8 / 4;
+ static const Int ones = ~Int{0};
+ return ones >> std::max(0, 4 * (kNumNibbles - nibble_index - 1));
+}
+
+// Return a mask with 1's below the given nibble.
+template <typename Int>
+Int MaskUpToNibbleExclusive(int nibble_index) {
+ return nibble_index <= 0 ? 0 : MaskUpToNibbleInclusive<Int>(nibble_index - 1);
+}
+
+template <typename Int>
+Int MoveToNibble(uint8_t nibble, int nibble_index) {
+ return Int{nibble} << (4 * nibble_index);
+}
+
+// Given mantissa size, find optimal # of mantissa bits to put in initial digit.
+//
+// In the hex representation we keep a single hex digit to the left of the dot.
+// However, the question as to how many bits of the mantissa should be put into
+// that hex digit in theory is arbitrary, but in practice it is optimal to
+// choose based on the size of the mantissa. E.g., for a `double`, there are 53
+// mantissa bits, so that means that we should put 1 bit to the left of the dot,
+// thereby leaving 52 bits to the right, which is evenly divisible by four and
+// thus all fractional digits represent actual precision. For a `long double`,
+// on the other hand, there are 64 bits of mantissa, thus we can use all four
+// bits for the initial hex digit and still have a number left over (60) that is
+// a multiple of four. Once again, the goal is to have all fractional digits
+// represent real precision.
+template <typename Float>
+constexpr int HexFloatLeadingDigitSizeInBits() {
+ return std::numeric_limits<Float>::digits % 4 > 0
+ ? std::numeric_limits<Float>::digits % 4
+ : 4;
+}
+
+// This function captures the rounding behavior of glibc for hex float
+// representations. E.g. when rounding 0x1.ab800000 to a precision of .2
+// ("%.2a") glibc will round up because it rounds toward the even number (since
+// 0xb is an odd number, it will round up to 0xc). However, when rounding at a
+// point that is not followed by 800000..., it disregards the parity and rounds
+// up if > 8 and rounds down if < 8.
+template <typename Int>
+bool HexFloatNeedsRoundUp(Int mantissa, int final_nibble_displayed,
+ uint8_t leading) {
+ // If the last nibble (hex digit) to be displayed is the lowest on in the
+ // mantissa then that means that we don't have any further nibbles to inform
+ // rounding, so don't round.
+ if (final_nibble_displayed <= 0) {
+ return false;
+ }
+ int rounding_nibble_idx = final_nibble_displayed - 1;
+ constexpr int kTotalNibbles = sizeof(Int) * 8 / 4;
+ assert(final_nibble_displayed <= kTotalNibbles);
+ Int mantissa_up_to_rounding_nibble_inclusive =
+ mantissa & MaskUpToNibbleInclusive<Int>(rounding_nibble_idx);
+ Int eight = MoveToNibble<Int>(8, rounding_nibble_idx);
+ if (mantissa_up_to_rounding_nibble_inclusive != eight) {
+ return mantissa_up_to_rounding_nibble_inclusive > eight;
+ }
+ // Nibble in question == 8.
+ uint8_t round_if_odd = (final_nibble_displayed == kTotalNibbles)
+ ? leading
+ : GetNibble(mantissa, final_nibble_displayed);
+ return round_if_odd % 2 == 1;
+}
+
+// Stores values associated with a Float type needed by the FormatA
+// implementation in order to avoid templatizing that function by the Float
+// type.
+struct HexFloatTypeParams {
+ template <typename Float>
+ explicit HexFloatTypeParams(Float)
+ : min_exponent(std::numeric_limits<Float>::min_exponent - 1),
+ leading_digit_size_bits(HexFloatLeadingDigitSizeInBits<Float>()) {
+ assert(leading_digit_size_bits >= 1 && leading_digit_size_bits <= 4);
+ }
+
+ int min_exponent;
+ int leading_digit_size_bits;
+};
+
+// Hex Float Rounding. First check if we need to round; if so, then we do that
+// by manipulating (incrementing) the mantissa, that way we can later print the
+// mantissa digits by iterating through them in the same way regardless of
+// whether a rounding happened.
+template <typename Int>
+void FormatARound(bool precision_specified, const FormatState &state,
+ uint8_t *leading, Int *mantissa, int *exp) {
+ constexpr int kTotalNibbles = sizeof(Int) * 8 / 4;
+ // Index of the last nibble that we could display given precision.
+ int final_nibble_displayed =
+ precision_specified ? std::max(0, (kTotalNibbles - state.precision)) : 0;
+ if (HexFloatNeedsRoundUp(*mantissa, final_nibble_displayed, *leading)) {
+ // Need to round up.
+ bool overflow = IncrementNibble(final_nibble_displayed, mantissa);
+ *leading += (overflow ? 1 : 0);
+ if (ABSL_PREDICT_FALSE(*leading > 15)) {
+ // We have overflowed the leading digit. This would mean that we would
+ // need two hex digits to the left of the dot, which is not allowed. So
+ // adjust the mantissa and exponent so that the result is always 1.0eXXX.
+ *leading = 1;
+ *mantissa = 0;
+ *exp += 4;
+ }
+ }
+ // Now that we have handled a possible round-up we can go ahead and zero out
+ // all the nibbles of the mantissa that we won't need.
+ if (precision_specified) {
+ *mantissa &= ~MaskUpToNibbleExclusive<Int>(final_nibble_displayed);
+ }
+}
+
+template <typename Int>
+void FormatANormalize(const HexFloatTypeParams float_traits, uint8_t *leading,
+ Int *mantissa, int *exp) {
+ constexpr int kIntBits = sizeof(Int) * 8;
+ static const Int kHighIntBit = Int{1} << (kIntBits - 1);
+ const int kLeadDigitBitsCount = float_traits.leading_digit_size_bits;
+ // Normalize mantissa so that highest bit set is in MSB position, unless we
+ // get interrupted by the exponent threshold.
+ while (*mantissa && !(*mantissa & kHighIntBit)) {
+ if (ABSL_PREDICT_FALSE(*exp - 1 < float_traits.min_exponent)) {
+ *mantissa >>= (float_traits.min_exponent - *exp);
+ *exp = float_traits.min_exponent;
+ return;
+ }
+ *mantissa <<= 1;
+ --*exp;
+ }
+ // Extract bits for leading digit then shift them away leaving the
+ // fractional part.
+ *leading =
+ static_cast<uint8_t>(*mantissa >> (kIntBits - kLeadDigitBitsCount));
+ *exp -= (*mantissa != 0) ? kLeadDigitBitsCount : *exp;
+ *mantissa <<= kLeadDigitBitsCount;
+}
+
+template <typename Int>
+void FormatA(const HexFloatTypeParams float_traits, Int mantissa, int exp,
+ bool uppercase, const FormatState &state) {
+ // Int properties.
+ constexpr int kIntBits = sizeof(Int) * 8;
+ constexpr int kTotalNibbles = sizeof(Int) * 8 / 4;
+ // Did the user specify a precision explicitly?
+ const bool precision_specified = state.conv.precision() >= 0;
+
+ // ========== Normalize/Denormalize ==========
+ exp += kIntBits; // make all digits fractional digits.
+ // This holds the (up to four) bits of leading digit, i.e., the '1' in the
+ // number 0x1.e6fp+2. It's always > 0 unless number is zero or denormal.
+ uint8_t leading = 0;
+ FormatANormalize(float_traits, &leading, &mantissa, &exp);
+
+ // =============== Rounding ==================
+ // Check if we need to round; if so, then we do that by manipulating
+ // (incrementing) the mantissa before beginning to print characters.
+ FormatARound(precision_specified, state, &leading, &mantissa, &exp);
+
+ // ============= Format Result ===============
+ // This buffer holds the "0x1.ab1de3" portion of "0x1.ab1de3pe+2". Compute the
+ // size with long double which is the largest of the floats.
+ constexpr size_t kBufSizeForHexFloatRepr =
+ 2 // 0x
+ + std::numeric_limits<long double>::digits / 4 // number of hex digits
+ + 1 // round up
+ + 1; // "." (dot)
+ char digits_buffer[kBufSizeForHexFloatRepr];
+ char *digits_iter = digits_buffer;
+ const char *const digits =
+ static_cast<const char *>("0123456789ABCDEF0123456789abcdef") +
+ (uppercase ? 0 : 16);
+
+ // =============== Hex Prefix ================
+ *digits_iter++ = '0';
+ *digits_iter++ = uppercase ? 'X' : 'x';
+
+ // ========== Non-Fractional Digit ===========
+ *digits_iter++ = digits[leading];
+
+ // ================== Dot ====================
+ // There are three reasons we might need a dot. Keep in mind that, at this
+ // point, the mantissa holds only the fractional part.
+ if ((precision_specified && state.precision > 0) ||
+ (!precision_specified && mantissa > 0) || state.conv.has_alt_flag()) {
+ *digits_iter++ = '.';
+ }
+
+ // ============ Fractional Digits ============
+ int digits_emitted = 0;
+ while (mantissa > 0) {
+ *digits_iter++ = digits[GetNibble(mantissa, kTotalNibbles - 1)];
+ mantissa <<= 4;
+ ++digits_emitted;
+ }
+ int trailing_zeros =
+ precision_specified ? state.precision - digits_emitted : 0;
+ assert(trailing_zeros >= 0);
+ auto digits_result = string_view(digits_buffer, digits_iter - digits_buffer);
+
+ // =============== Exponent ==================
+ constexpr size_t kBufSizeForExpDecRepr =
+ numbers_internal::kFastToBufferSize // requred for FastIntToBuffer
+ + 1 // 'p' or 'P'
+ + 1; // '+' or '-'
+ char exp_buffer[kBufSizeForExpDecRepr];
+ exp_buffer[0] = uppercase ? 'P' : 'p';
+ exp_buffer[1] = exp >= 0 ? '+' : '-';
+ numbers_internal::FastIntToBuffer(exp < 0 ? -exp : exp, exp_buffer + 2);
+
+ // ============ Assemble Result ==============
+ FinalPrint(state, //
+ digits_result, // 0xN.NNN...
+ 2, // offset in `data` to start padding if needed.
+ trailing_zeros, // num remaining mantissa padding zeros
+ exp_buffer); // exponent
+}
+
+char *CopyStringTo(absl::string_view v, char *out) {
+ std::memcpy(out, v.data(), v.size());
+ return out + v.size();
+}
+
+template <typename Float>
+bool FallbackToSnprintf(const Float v, const FormatConversionSpecImpl &conv,
+ FormatSinkImpl *sink) {
+ int w = conv.width() >= 0 ? conv.width() : 0;
+ int p = conv.precision() >= 0 ? conv.precision() : -1;
+ char fmt[32];
+ {
+ char *fp = fmt;
+ *fp++ = '%';
+ fp = CopyStringTo(FormatConversionSpecImplFriend::FlagsToString(conv), fp);
+ fp = CopyStringTo("*.*", fp);
+ if (std::is_same<long double, Float>()) {
+ *fp++ = 'L';
+ }
+ *fp++ = FormatConversionCharToChar(conv.conversion_char());
+ *fp = 0;
+ assert(fp < fmt + sizeof(fmt));
+ }
+ std::string space(512, '\0');
+ absl::string_view result;
+ while (true) {
+ int n = snprintf(&space[0], space.size(), fmt, w, p, v);
+ if (n < 0) return false;
+ if (static_cast<size_t>(n) < space.size()) {
+ result = absl::string_view(space.data(), n);
+ break;
+ }
+ space.resize(n + 1);
+ }
+ sink->Append(result);
+ return true;
+}
+
+// 128-bits in decimal: ceil(128*log(2)/log(10))
+// or std::numeric_limits<__uint128_t>::digits10
+constexpr int kMaxFixedPrecision = 39;
+
+constexpr int kBufferLength = /*sign*/ 1 +
+ /*integer*/ kMaxFixedPrecision +
+ /*point*/ 1 +
+ /*fraction*/ kMaxFixedPrecision +
+ /*exponent e+123*/ 5;
+
+struct Buffer {
+ void push_front(char c) {
+ assert(begin > data);
+ *--begin = c;
+ }
+ void push_back(char c) {
+ assert(end < data + sizeof(data));
+ *end++ = c;
+ }
+ void pop_back() {
+ assert(begin < end);
+ --end;
+ }
+
+ char &back() {
+ assert(begin < end);
+ return end[-1];
+ }
+
+ char last_digit() const { return end[-1] == '.' ? end[-2] : end[-1]; }
+
+ int size() const { return static_cast<int>(end - begin); }
+
+ char data[kBufferLength];
+ char *begin;
+ char *end;
+};
+
+enum class FormatStyle { Fixed, Precision };
+
+// If the value is Inf or Nan, print it and return true.
+// Otherwise, return false.
+template <typename Float>
+bool ConvertNonNumericFloats(char sign_char, Float v,
+ const FormatConversionSpecImpl &conv,
+ FormatSinkImpl *sink) {
+ char text[4], *ptr = text;
+ if (sign_char != '\0') *ptr++ = sign_char;
+ if (std::isnan(v)) {
+ ptr = std::copy_n(
+ FormatConversionCharIsUpper(conv.conversion_char()) ? "NAN" : "nan", 3,
+ ptr);
+ } else if (std::isinf(v)) {
+ ptr = std::copy_n(
+ FormatConversionCharIsUpper(conv.conversion_char()) ? "INF" : "inf", 3,
+ ptr);
+ } else {
+ return false;
+ }
+
+ return sink->PutPaddedString(string_view(text, ptr - text), conv.width(), -1,
+ conv.has_left_flag());
+}
+
+// Round up the last digit of the value.
+// It will carry over and potentially overflow. 'exp' will be adjusted in that
+// case.
+template <FormatStyle mode>
+void RoundUp(Buffer *buffer, int *exp) {
+ char *p = &buffer->back();
+ while (p >= buffer->begin && (*p == '9' || *p == '.')) {
+ if (*p == '9') *p = '0';
+ --p;
+ }
+
+ if (p < buffer->begin) {
+ *p = '1';
+ buffer->begin = p;
+ if (mode == FormatStyle::Precision) {
+ std::swap(p[1], p[2]); // move the .
+ ++*exp;
+ buffer->pop_back();
+ }
+ } else {
+ ++*p;
+ }
+}
+
+void PrintExponent(int exp, char e, Buffer *out) {
+ out->push_back(e);
+ if (exp < 0) {
+ out->push_back('-');
+ exp = -exp;
+ } else {
+ out->push_back('+');
+ }
+ // Exponent digits.
+ if (exp > 99) {
+ out->push_back(exp / 100 + '0');
+ out->push_back(exp / 10 % 10 + '0');
+ out->push_back(exp % 10 + '0');
+ } else {
+ out->push_back(exp / 10 + '0');
+ out->push_back(exp % 10 + '0');
+ }
+}
+
+template <typename Float, typename Int>
+constexpr bool CanFitMantissa() {
+ return
+#if defined(__clang__) && !defined(__SSE3__)
+ // Workaround for clang bug: https://bugs.llvm.org/show_bug.cgi?id=38289
+ // Casting from long double to uint64_t is miscompiled and drops bits.
+ (!std::is_same<Float, long double>::value ||
+ !std::is_same<Int, uint64_t>::value) &&
+#endif
+ std::numeric_limits<Float>::digits <= std::numeric_limits<Int>::digits;
+}
+
+template <typename Float>
+struct Decomposed {
+ using MantissaType =
+ absl::conditional_t<std::is_same<long double, Float>::value, uint128,
+ uint64_t>;
+ static_assert(std::numeric_limits<Float>::digits <= sizeof(MantissaType) * 8,
+ "");
+ MantissaType mantissa;
+ int exponent;
+};
+
+// Decompose the double into an integer mantissa and an exponent.
+template <typename Float>
+Decomposed<Float> Decompose(Float v) {
+ int exp;
+ Float m = std::frexp(v, &exp);
+ m = std::ldexp(m, std::numeric_limits<Float>::digits);
+ exp -= std::numeric_limits<Float>::digits;
+
+ return {static_cast<typename Decomposed<Float>::MantissaType>(m), exp};
+}
+
+// Print 'digits' as decimal.
+// In Fixed mode, we add a '.' at the end.
+// In Precision mode, we add a '.' after the first digit.
+template <FormatStyle mode, typename Int>
+int PrintIntegralDigits(Int digits, Buffer *out) {
+ int printed = 0;
+ if (digits) {
+ for (; digits; digits /= 10) out->push_front(digits % 10 + '0');
+ printed = out->size();
+ if (mode == FormatStyle::Precision) {
+ out->push_front(*out->begin);
+ out->begin[1] = '.';
+ } else {
+ out->push_back('.');
+ }
+ } else if (mode == FormatStyle::Fixed) {
+ out->push_front('0');
+ out->push_back('.');
+ printed = 1;
+ }
+ return printed;
+}
+
+// Back out 'extra_digits' digits and round up if necessary.
+bool RemoveExtraPrecision(int extra_digits, bool has_leftover_value,
+ Buffer *out, int *exp_out) {
+ if (extra_digits <= 0) return false;
+
+ // Back out the extra digits
+ out->end -= extra_digits;
+
+ bool needs_to_round_up = [&] {
+ // We look at the digit just past the end.
+ // There must be 'extra_digits' extra valid digits after end.
+ if (*out->end > '5') return true;
+ if (*out->end < '5') return false;
+ if (has_leftover_value || std::any_of(out->end + 1, out->end + extra_digits,
+ [](char c) { return c != '0'; }))
+ return true;
+
+ // Ends in ...50*, round to even.
+ return out->last_digit() % 2 == 1;
+ }();
+
+ if (needs_to_round_up) {
+ RoundUp<FormatStyle::Precision>(out, exp_out);
+ }
+ return true;
+}
+
+// Print the value into the buffer.
+// This will not include the exponent, which will be returned in 'exp_out' for
+// Precision mode.
+template <typename Int, typename Float, FormatStyle mode>
+bool FloatToBufferImpl(Int int_mantissa, int exp, int precision, Buffer *out,
+ int *exp_out) {
+ assert((CanFitMantissa<Float, Int>()));
+
+ const int int_bits = std::numeric_limits<Int>::digits;
+
+ // In precision mode, we start printing one char to the right because it will
+ // also include the '.'
+ // In fixed mode we put the dot afterwards on the right.
+ out->begin = out->end =
+ out->data + 1 + kMaxFixedPrecision + (mode == FormatStyle::Precision);
+
+ if (exp >= 0) {
+ if (std::numeric_limits<Float>::digits + exp > int_bits) {
+ // The value will overflow the Int
+ return false;
+ }
+ int digits_printed = PrintIntegralDigits<mode>(int_mantissa << exp, out);
+ int digits_to_zero_pad = precision;
+ if (mode == FormatStyle::Precision) {
+ *exp_out = digits_printed - 1;
+ digits_to_zero_pad -= digits_printed - 1;
+ if (RemoveExtraPrecision(-digits_to_zero_pad, false, out, exp_out)) {
+ return true;
+ }
+ }
+ for (; digits_to_zero_pad-- > 0;) out->push_back('0');
+ return true;
+ }
+
+ exp = -exp;
+ // We need at least 4 empty bits for the next decimal digit.
+ // We will multiply by 10.
+ if (exp > int_bits - 4) return false;
+
+ const Int mask = (Int{1} << exp) - 1;
+
+ // Print the integral part first.
+ int digits_printed = PrintIntegralDigits<mode>(int_mantissa >> exp, out);
+ int_mantissa &= mask;
+
+ int fractional_count = precision;
+ if (mode == FormatStyle::Precision) {
+ if (digits_printed == 0) {
+ // Find the first non-zero digit, when in Precision mode.
+ *exp_out = 0;
+ if (int_mantissa) {
+ while (int_mantissa <= mask) {
+ int_mantissa *= 10;
+ --*exp_out;
+ }
+ }
+ out->push_front(static_cast<char>(int_mantissa >> exp) + '0');
+ out->push_back('.');
+ int_mantissa &= mask;
+ } else {
+ // We already have a digit, and a '.'
+ *exp_out = digits_printed - 1;
+ fractional_count -= *exp_out;
+ if (RemoveExtraPrecision(-fractional_count, int_mantissa != 0, out,
+ exp_out)) {
+ // If we had enough digits, return right away.
+ // The code below will try to round again otherwise.
+ return true;
+ }
+ }
+ }
+
+ auto get_next_digit = [&] {
+ int_mantissa *= 10;
+ int digit = static_cast<int>(int_mantissa >> exp);
+ int_mantissa &= mask;
+ return digit;
+ };
+
+ // Print fractional_count more digits, if available.
+ for (; fractional_count > 0; --fractional_count) {
+ out->push_back(get_next_digit() + '0');
+ }
+
+ int next_digit = get_next_digit();
+ if (next_digit > 5 ||
+ (next_digit == 5 && (int_mantissa || out->last_digit() % 2 == 1))) {
+ RoundUp<mode>(out, exp_out);
+ }
+
+ return true;
+}
+
+template <FormatStyle mode, typename Float>
+bool FloatToBuffer(Decomposed<Float> decomposed, int precision, Buffer *out,
+ int *exp) {
+ if (precision > kMaxFixedPrecision) return false;
+
+ // Try with uint64_t.
+ if (CanFitMantissa<Float, std::uint64_t>() &&
+ FloatToBufferImpl<std::uint64_t, Float, mode>(
+ static_cast<std::uint64_t>(decomposed.mantissa),
+ static_cast<std::uint64_t>(decomposed.exponent), precision, out, exp))
+ return true;
+
+#if defined(ABSL_HAVE_INTRINSIC_INT128)
+ // If that is not enough, try with __uint128_t.
+ return CanFitMantissa<Float, __uint128_t>() &&
+ FloatToBufferImpl<__uint128_t, Float, mode>(
+ static_cast<__uint128_t>(decomposed.mantissa),
+ static_cast<__uint128_t>(decomposed.exponent), precision, out,
+ exp);
+#endif
+ return false;
+}
+
+void WriteBufferToSink(char sign_char, absl::string_view str,
+ const FormatConversionSpecImpl &conv,
+ FormatSinkImpl *sink) {
+ int left_spaces = 0, zeros = 0, right_spaces = 0;
+ int missing_chars =
+ conv.width() >= 0 ? std::max(conv.width() - static_cast<int>(str.size()) -
+ static_cast<int>(sign_char != 0),
+ 0)
+ : 0;
+ if (conv.has_left_flag()) {
+ right_spaces = missing_chars;
+ } else if (conv.has_zero_flag()) {
+ zeros = missing_chars;
+ } else {
+ left_spaces = missing_chars;
+ }
+
+ sink->Append(left_spaces, ' ');
+ if (sign_char != '\0') sink->Append(1, sign_char);
+ sink->Append(zeros, '0');
+ sink->Append(str);
+ sink->Append(right_spaces, ' ');
+}
+
+template <typename Float>
+bool FloatToSink(const Float v, const FormatConversionSpecImpl &conv,
+ FormatSinkImpl *sink) {
+ // Print the sign or the sign column.
+ Float abs_v = v;
+ char sign_char = 0;
+ if (std::signbit(abs_v)) {
+ sign_char = '-';
+ abs_v = -abs_v;
+ } else if (conv.has_show_pos_flag()) {
+ sign_char = '+';
+ } else if (conv.has_sign_col_flag()) {
+ sign_char = ' ';
+ }
+
+ // Print nan/inf.
+ if (ConvertNonNumericFloats(sign_char, abs_v, conv, sink)) {
+ return true;
+ }
+
+ int precision = conv.precision() < 0 ? 6 : conv.precision();
+
+ int exp = 0;
+
+ auto decomposed = Decompose(abs_v);
+
+ Buffer buffer;
+
+ FormatConversionChar c = conv.conversion_char();
+
+ if (c == FormatConversionCharInternal::f ||
+ c == FormatConversionCharInternal::F) {
+ FormatF(decomposed.mantissa, decomposed.exponent,
+ {sign_char, precision, conv, sink});
+ return true;
+ } else if (c == FormatConversionCharInternal::e ||
+ c == FormatConversionCharInternal::E) {
+ if (!FloatToBuffer<FormatStyle::Precision>(decomposed, precision, &buffer,
+ &exp)) {
+ return FallbackToSnprintf(v, conv, sink);
+ }
+ if (!conv.has_alt_flag() && buffer.back() == '.') buffer.pop_back();
+ PrintExponent(
+ exp, FormatConversionCharIsUpper(conv.conversion_char()) ? 'E' : 'e',
+ &buffer);
+ } else if (c == FormatConversionCharInternal::g ||
+ c == FormatConversionCharInternal::G) {
+ precision = std::max(0, precision - 1);
+ if (!FloatToBuffer<FormatStyle::Precision>(decomposed, precision, &buffer,
+ &exp)) {
+ return FallbackToSnprintf(v, conv, sink);
+ }
+ if (precision + 1 > exp && exp >= -4) {
+ if (exp < 0) {
+ // Have 1.23456, needs 0.00123456
+ // Move the first digit
+ buffer.begin[1] = *buffer.begin;
+ // Add some zeros
+ for (; exp < -1; ++exp) *buffer.begin-- = '0';
+ *buffer.begin-- = '.';
+ *buffer.begin = '0';
+ } else if (exp > 0) {
+ // Have 1.23456, needs 1234.56
+ // Move the '.' exp positions to the right.
+ std::rotate(buffer.begin + 1, buffer.begin + 2, buffer.begin + exp + 2);
+ }
+ exp = 0;
+ }
+ if (!conv.has_alt_flag()) {
+ while (buffer.back() == '0') buffer.pop_back();
+ if (buffer.back() == '.') buffer.pop_back();
+ }
+ if (exp) {
+ PrintExponent(
+ exp, FormatConversionCharIsUpper(conv.conversion_char()) ? 'E' : 'e',
+ &buffer);
+ }
+ } else if (c == FormatConversionCharInternal::a ||
+ c == FormatConversionCharInternal::A) {
+ bool uppercase = (c == FormatConversionCharInternal::A);
+ FormatA(HexFloatTypeParams(Float{}), decomposed.mantissa,
+ decomposed.exponent, uppercase, {sign_char, precision, conv, sink});
+ return true;
+ } else {
+ return false;
+ }
+
+ WriteBufferToSink(sign_char,
+ absl::string_view(buffer.begin, buffer.end - buffer.begin),
+ conv, sink);
+
+ return true;
+}
+
+} // namespace
+
+bool ConvertFloatImpl(long double v, const FormatConversionSpecImpl &conv,
+ FormatSinkImpl *sink) {
+ if (std::numeric_limits<long double>::digits ==
+ 2 * std::numeric_limits<double>::digits) {
+ // This is the `double-double` representation of `long double`.
+ // We do not handle it natively. Fallback to snprintf.
+ return FallbackToSnprintf(v, conv, sink);
+ }
+
+ return FloatToSink(v, conv, sink);
+}
+
+bool ConvertFloatImpl(float v, const FormatConversionSpecImpl &conv,
+ FormatSinkImpl *sink) {
+ return FloatToSink(static_cast<double>(v), conv, sink);
+}
+
+bool ConvertFloatImpl(double v, const FormatConversionSpecImpl &conv,
+ FormatSinkImpl *sink) {
+ return FloatToSink(v, conv, sink);
+}
+
+} // namespace str_format_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/strings/internal/str_format/float_conversion.h b/third_party/abseil/src/absl/strings/internal/str_format/float_conversion.h
new file mode 100644
index 0000000..71100e7
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/internal/str_format/float_conversion.h
@@ -0,0 +1,37 @@
+// Copyright 2020 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_STRINGS_INTERNAL_STR_FORMAT_FLOAT_CONVERSION_H_
+#define ABSL_STRINGS_INTERNAL_STR_FORMAT_FLOAT_CONVERSION_H_
+
+#include "absl/strings/internal/str_format/extension.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace str_format_internal {
+
+bool ConvertFloatImpl(float v, const FormatConversionSpecImpl &conv,
+ FormatSinkImpl *sink);
+
+bool ConvertFloatImpl(double v, const FormatConversionSpecImpl &conv,
+ FormatSinkImpl *sink);
+
+bool ConvertFloatImpl(long double v, const FormatConversionSpecImpl &conv,
+ FormatSinkImpl *sink);
+
+} // namespace str_format_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_STRINGS_INTERNAL_STR_FORMAT_FLOAT_CONVERSION_H_
diff --git a/third_party/abseil/src/absl/strings/internal/str_format/output.cc b/third_party/abseil/src/absl/strings/internal/str_format/output.cc
new file mode 100644
index 0000000..c4b2470
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/internal/str_format/output.cc
@@ -0,0 +1,72 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/strings/internal/str_format/output.h"
+
+#include <errno.h>
+#include <cstring>
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace str_format_internal {
+
+namespace {
+struct ClearErrnoGuard {
+ ClearErrnoGuard() : old_value(errno) { errno = 0; }
+ ~ClearErrnoGuard() {
+ if (!errno) errno = old_value;
+ }
+ int old_value;
+};
+} // namespace
+
+void BufferRawSink::Write(string_view v) {
+ size_t to_write = std::min(v.size(), size_);
+ std::memcpy(buffer_, v.data(), to_write);
+ buffer_ += to_write;
+ size_ -= to_write;
+ total_written_ += v.size();
+}
+
+void FILERawSink::Write(string_view v) {
+ while (!v.empty() && !error_) {
+ // Reset errno to zero in case the libc implementation doesn't set errno
+ // when a failure occurs.
+ ClearErrnoGuard guard;
+
+ if (size_t result = std::fwrite(v.data(), 1, v.size(), output_)) {
+ // Some progress was made.
+ count_ += result;
+ v.remove_prefix(result);
+ } else {
+ if (errno == EINTR) {
+ continue;
+ } else if (errno) {
+ error_ = errno;
+ } else if (std::ferror(output_)) {
+ // Non-POSIX compliant libc implementations may not set errno, so we
+ // have check the streams error indicator.
+ error_ = EBADF;
+ } else {
+ // We're likely on a non-POSIX system that encountered EINTR but had no
+ // way of reporting it.
+ continue;
+ }
+ }
+ }
+}
+
+} // namespace str_format_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/strings/internal/str_format/output.h b/third_party/abseil/src/absl/strings/internal/str_format/output.h
new file mode 100644
index 0000000..8030dae
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/internal/str_format/output.h
@@ -0,0 +1,96 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// Output extension hooks for the Format library.
+// `internal::InvokeFlush` calls the appropriate flush function for the
+// specified output argument.
+// `BufferRawSink` is a simple output sink for a char buffer. Used by SnprintF.
+// `FILERawSink` is a std::FILE* based sink. Used by PrintF and FprintF.
+
+#ifndef ABSL_STRINGS_INTERNAL_STR_FORMAT_OUTPUT_H_
+#define ABSL_STRINGS_INTERNAL_STR_FORMAT_OUTPUT_H_
+
+#include <cstdio>
+#include <ostream>
+#include <string>
+
+#include "absl/base/port.h"
+#include "absl/strings/string_view.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace str_format_internal {
+
+// RawSink implementation that writes into a char* buffer.
+// It will not overflow the buffer, but will keep the total count of chars
+// that would have been written.
+class BufferRawSink {
+ public:
+ BufferRawSink(char* buffer, size_t size) : buffer_(buffer), size_(size) {}
+
+ size_t total_written() const { return total_written_; }
+ void Write(string_view v);
+
+ private:
+ char* buffer_;
+ size_t size_;
+ size_t total_written_ = 0;
+};
+
+// RawSink implementation that writes into a FILE*.
+// It keeps track of the total number of bytes written and any error encountered
+// during the writes.
+class FILERawSink {
+ public:
+ explicit FILERawSink(std::FILE* output) : output_(output) {}
+
+ void Write(string_view v);
+
+ size_t count() const { return count_; }
+ int error() const { return error_; }
+
+ private:
+ std::FILE* output_;
+ int error_ = 0;
+ size_t count_ = 0;
+};
+
+// Provide RawSink integration with common types from the STL.
+inline void AbslFormatFlush(std::string* out, string_view s) {
+ out->append(s.data(), s.size());
+}
+inline void AbslFormatFlush(std::ostream* out, string_view s) {
+ out->write(s.data(), s.size());
+}
+
+inline void AbslFormatFlush(FILERawSink* sink, string_view v) {
+ sink->Write(v);
+}
+
+inline void AbslFormatFlush(BufferRawSink* sink, string_view v) {
+ sink->Write(v);
+}
+
+// This is a SFINAE to get a better compiler error message when the type
+// is not supported.
+template <typename T>
+auto InvokeFlush(T* out, string_view s) -> decltype(AbslFormatFlush(out, s)) {
+ AbslFormatFlush(out, s);
+}
+
+} // namespace str_format_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_STRINGS_INTERNAL_STR_FORMAT_OUTPUT_H_
diff --git a/third_party/abseil/src/absl/strings/internal/str_format/output_test.cc b/third_party/abseil/src/absl/strings/internal/str_format/output_test.cc
new file mode 100644
index 0000000..ce2e91a
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/internal/str_format/output_test.cc
@@ -0,0 +1,79 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/strings/internal/str_format/output.h"
+
+#include <sstream>
+#include <string>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/strings/cord.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace {
+
+TEST(InvokeFlush, String) {
+ std::string str = "ABC";
+ str_format_internal::InvokeFlush(&str, "DEF");
+ EXPECT_EQ(str, "ABCDEF");
+}
+
+TEST(InvokeFlush, Stream) {
+ std::stringstream str;
+ str << "ABC";
+ str_format_internal::InvokeFlush(&str, "DEF");
+ EXPECT_EQ(str.str(), "ABCDEF");
+}
+
+TEST(InvokeFlush, Cord) {
+ absl::Cord str("ABC");
+ str_format_internal::InvokeFlush(&str, "DEF");
+ EXPECT_EQ(str, "ABCDEF");
+}
+
+TEST(BufferRawSink, Limits) {
+ char buf[16];
+ {
+ std::fill(std::begin(buf), std::end(buf), 'x');
+ str_format_internal::BufferRawSink bufsink(buf, sizeof(buf) - 1);
+ str_format_internal::InvokeFlush(&bufsink, "Hello World237");
+ EXPECT_EQ(std::string(buf, sizeof(buf)), "Hello World237xx");
+ }
+ {
+ std::fill(std::begin(buf), std::end(buf), 'x');
+ str_format_internal::BufferRawSink bufsink(buf, sizeof(buf) - 1);
+ str_format_internal::InvokeFlush(&bufsink, "Hello World237237");
+ EXPECT_EQ(std::string(buf, sizeof(buf)), "Hello World2372x");
+ }
+ {
+ std::fill(std::begin(buf), std::end(buf), 'x');
+ str_format_internal::BufferRawSink bufsink(buf, sizeof(buf) - 1);
+ str_format_internal::InvokeFlush(&bufsink, "Hello World");
+ str_format_internal::InvokeFlush(&bufsink, "237");
+ EXPECT_EQ(std::string(buf, sizeof(buf)), "Hello World237xx");
+ }
+ {
+ std::fill(std::begin(buf), std::end(buf), 'x');
+ str_format_internal::BufferRawSink bufsink(buf, sizeof(buf) - 1);
+ str_format_internal::InvokeFlush(&bufsink, "Hello World");
+ str_format_internal::InvokeFlush(&bufsink, "237237");
+ EXPECT_EQ(std::string(buf, sizeof(buf)), "Hello World2372x");
+ }
+}
+
+} // namespace
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/strings/internal/str_format/parser.cc b/third_party/abseil/src/absl/strings/internal/str_format/parser.cc
new file mode 100644
index 0000000..f308d02
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/internal/str_format/parser.cc
@@ -0,0 +1,350 @@
+// Copyright 2020 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/strings/internal/str_format/parser.h"
+
+#include <assert.h>
+#include <string.h>
+#include <wchar.h>
+#include <cctype>
+#include <cstdint>
+
+#include <algorithm>
+#include <initializer_list>
+#include <limits>
+#include <ostream>
+#include <string>
+#include <unordered_set>
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace str_format_internal {
+
+using CC = FormatConversionCharInternal;
+using LM = LengthMod;
+
+ABSL_CONST_INIT const ConvTag kTags[256] = {
+ {}, {}, {}, {}, {}, {}, {}, {}, // 00-07
+ {}, {}, {}, {}, {}, {}, {}, {}, // 08-0f
+ {}, {}, {}, {}, {}, {}, {}, {}, // 10-17
+ {}, {}, {}, {}, {}, {}, {}, {}, // 18-1f
+ {}, {}, {}, {}, {}, {}, {}, {}, // 20-27
+ {}, {}, {}, {}, {}, {}, {}, {}, // 28-2f
+ {}, {}, {}, {}, {}, {}, {}, {}, // 30-37
+ {}, {}, {}, {}, {}, {}, {}, {}, // 38-3f
+ {}, CC::A, {}, {}, {}, CC::E, CC::F, CC::G, // @ABCDEFG
+ {}, {}, {}, {}, LM::L, {}, {}, {}, // HIJKLMNO
+ {}, {}, {}, {}, {}, {}, {}, {}, // PQRSTUVW
+ CC::X, {}, {}, {}, {}, {}, {}, {}, // XYZ[\]^_
+ {}, CC::a, {}, CC::c, CC::d, CC::e, CC::f, CC::g, // `abcdefg
+ LM::h, CC::i, LM::j, {}, LM::l, {}, CC::n, CC::o, // hijklmno
+ CC::p, LM::q, {}, CC::s, LM::t, CC::u, {}, {}, // pqrstuvw
+ CC::x, {}, LM::z, {}, {}, {}, {}, {}, // xyz{|}!
+ {}, {}, {}, {}, {}, {}, {}, {}, // 80-87
+ {}, {}, {}, {}, {}, {}, {}, {}, // 88-8f
+ {}, {}, {}, {}, {}, {}, {}, {}, // 90-97
+ {}, {}, {}, {}, {}, {}, {}, {}, // 98-9f
+ {}, {}, {}, {}, {}, {}, {}, {}, // a0-a7
+ {}, {}, {}, {}, {}, {}, {}, {}, // a8-af
+ {}, {}, {}, {}, {}, {}, {}, {}, // b0-b7
+ {}, {}, {}, {}, {}, {}, {}, {}, // b8-bf
+ {}, {}, {}, {}, {}, {}, {}, {}, // c0-c7
+ {}, {}, {}, {}, {}, {}, {}, {}, // c8-cf
+ {}, {}, {}, {}, {}, {}, {}, {}, // d0-d7
+ {}, {}, {}, {}, {}, {}, {}, {}, // d8-df
+ {}, {}, {}, {}, {}, {}, {}, {}, // e0-e7
+ {}, {}, {}, {}, {}, {}, {}, {}, // e8-ef
+ {}, {}, {}, {}, {}, {}, {}, {}, // f0-f7
+ {}, {}, {}, {}, {}, {}, {}, {}, // f8-ff
+};
+
+namespace {
+
+bool CheckFastPathSetting(const UnboundConversion& conv) {
+ bool should_be_basic = !conv.flags.left && //
+ !conv.flags.show_pos && //
+ !conv.flags.sign_col && //
+ !conv.flags.alt && //
+ !conv.flags.zero && //
+ (conv.width.value() == -1) &&
+ (conv.precision.value() == -1);
+ if (should_be_basic != conv.flags.basic) {
+ fprintf(stderr,
+ "basic=%d left=%d show_pos=%d sign_col=%d alt=%d zero=%d "
+ "width=%d precision=%d\n",
+ conv.flags.basic, conv.flags.left, conv.flags.show_pos,
+ conv.flags.sign_col, conv.flags.alt, conv.flags.zero,
+ conv.width.value(), conv.precision.value());
+ }
+ return should_be_basic == conv.flags.basic;
+}
+
+template <bool is_positional>
+const char *ConsumeConversion(const char *pos, const char *const end,
+ UnboundConversion *conv, int *next_arg) {
+ const char* const original_pos = pos;
+ char c;
+ // Read the next char into `c` and update `pos`. Returns false if there are
+ // no more chars to read.
+#define ABSL_FORMAT_PARSER_INTERNAL_GET_CHAR() \
+ do { \
+ if (ABSL_PREDICT_FALSE(pos == end)) return nullptr; \
+ c = *pos++; \
+ } while (0)
+
+ const auto parse_digits = [&] {
+ int digits = c - '0';
+ // We do not want to overflow `digits` so we consume at most digits10
+ // digits. If there are more digits the parsing will fail later on when the
+ // digit doesn't match the expected characters.
+ int num_digits = std::numeric_limits<int>::digits10;
+ for (;;) {
+ if (ABSL_PREDICT_FALSE(pos == end)) break;
+ c = *pos++;
+ if (!std::isdigit(c)) break;
+ --num_digits;
+ if (ABSL_PREDICT_FALSE(!num_digits)) break;
+ digits = 10 * digits + c - '0';
+ }
+ return digits;
+ };
+
+ if (is_positional) {
+ ABSL_FORMAT_PARSER_INTERNAL_GET_CHAR();
+ if (ABSL_PREDICT_FALSE(c < '1' || c > '9')) return nullptr;
+ conv->arg_position = parse_digits();
+ assert(conv->arg_position > 0);
+ if (ABSL_PREDICT_FALSE(c != '$')) return nullptr;
+ }
+
+ ABSL_FORMAT_PARSER_INTERNAL_GET_CHAR();
+
+ // We should start with the basic flag on.
+ assert(conv->flags.basic);
+
+ // Any non alpha character makes this conversion not basic.
+ // This includes flags (-+ #0), width (1-9, *) or precision (.).
+ // All conversion characters and length modifiers are alpha characters.
+ if (c < 'A') {
+ conv->flags.basic = false;
+
+ for (; c <= '0';) {
+ // FIXME: We might be able to speed this up reusing the lookup table from
+ // above. It might require changing Flags to be a plain integer where we
+ // can |= a value.
+ switch (c) {
+ case '-':
+ conv->flags.left = true;
+ break;
+ case '+':
+ conv->flags.show_pos = true;
+ break;
+ case ' ':
+ conv->flags.sign_col = true;
+ break;
+ case '#':
+ conv->flags.alt = true;
+ break;
+ case '0':
+ conv->flags.zero = true;
+ break;
+ default:
+ goto flags_done;
+ }
+ ABSL_FORMAT_PARSER_INTERNAL_GET_CHAR();
+ }
+flags_done:
+
+ if (c <= '9') {
+ if (c >= '0') {
+ int maybe_width = parse_digits();
+ if (!is_positional && c == '$') {
+ if (ABSL_PREDICT_FALSE(*next_arg != 0)) return nullptr;
+ // Positional conversion.
+ *next_arg = -1;
+ conv->flags = Flags();
+ conv->flags.basic = true;
+ return ConsumeConversion<true>(original_pos, end, conv, next_arg);
+ }
+ conv->width.set_value(maybe_width);
+ } else if (c == '*') {
+ ABSL_FORMAT_PARSER_INTERNAL_GET_CHAR();
+ if (is_positional) {
+ if (ABSL_PREDICT_FALSE(c < '1' || c > '9')) return nullptr;
+ conv->width.set_from_arg(parse_digits());
+ if (ABSL_PREDICT_FALSE(c != '$')) return nullptr;
+ ABSL_FORMAT_PARSER_INTERNAL_GET_CHAR();
+ } else {
+ conv->width.set_from_arg(++*next_arg);
+ }
+ }
+ }
+
+ if (c == '.') {
+ ABSL_FORMAT_PARSER_INTERNAL_GET_CHAR();
+ if (std::isdigit(c)) {
+ conv->precision.set_value(parse_digits());
+ } else if (c == '*') {
+ ABSL_FORMAT_PARSER_INTERNAL_GET_CHAR();
+ if (is_positional) {
+ if (ABSL_PREDICT_FALSE(c < '1' || c > '9')) return nullptr;
+ conv->precision.set_from_arg(parse_digits());
+ if (c != '$') return nullptr;
+ ABSL_FORMAT_PARSER_INTERNAL_GET_CHAR();
+ } else {
+ conv->precision.set_from_arg(++*next_arg);
+ }
+ } else {
+ conv->precision.set_value(0);
+ }
+ }
+ }
+
+ auto tag = GetTagForChar(c);
+
+ if (ABSL_PREDICT_FALSE(!tag.is_conv())) {
+ if (ABSL_PREDICT_FALSE(!tag.is_length())) return nullptr;
+
+ // It is a length modifier.
+ using str_format_internal::LengthMod;
+ LengthMod length_mod = tag.as_length();
+ ABSL_FORMAT_PARSER_INTERNAL_GET_CHAR();
+ if (c == 'h' && length_mod == LengthMod::h) {
+ conv->length_mod = LengthMod::hh;
+ ABSL_FORMAT_PARSER_INTERNAL_GET_CHAR();
+ } else if (c == 'l' && length_mod == LengthMod::l) {
+ conv->length_mod = LengthMod::ll;
+ ABSL_FORMAT_PARSER_INTERNAL_GET_CHAR();
+ } else {
+ conv->length_mod = length_mod;
+ }
+ tag = GetTagForChar(c);
+ if (ABSL_PREDICT_FALSE(!tag.is_conv())) return nullptr;
+ }
+
+ assert(CheckFastPathSetting(*conv));
+ (void)(&CheckFastPathSetting);
+
+ conv->conv = tag.as_conv();
+ if (!is_positional) conv->arg_position = ++*next_arg;
+ return pos;
+}
+
+} // namespace
+
+std::string LengthModToString(LengthMod v) {
+ switch (v) {
+ case LengthMod::h:
+ return "h";
+ case LengthMod::hh:
+ return "hh";
+ case LengthMod::l:
+ return "l";
+ case LengthMod::ll:
+ return "ll";
+ case LengthMod::L:
+ return "L";
+ case LengthMod::j:
+ return "j";
+ case LengthMod::z:
+ return "z";
+ case LengthMod::t:
+ return "t";
+ case LengthMod::q:
+ return "q";
+ case LengthMod::none:
+ return "";
+ }
+ return "";
+}
+
+const char *ConsumeUnboundConversion(const char *p, const char *end,
+ UnboundConversion *conv, int *next_arg) {
+ if (*next_arg < 0) return ConsumeConversion<true>(p, end, conv, next_arg);
+ return ConsumeConversion<false>(p, end, conv, next_arg);
+}
+
+struct ParsedFormatBase::ParsedFormatConsumer {
+ explicit ParsedFormatConsumer(ParsedFormatBase *parsedformat)
+ : parsed(parsedformat), data_pos(parsedformat->data_.get()) {}
+
+ bool Append(string_view s) {
+ if (s.empty()) return true;
+
+ size_t text_end = AppendText(s);
+
+ if (!parsed->items_.empty() && !parsed->items_.back().is_conversion) {
+ // Let's extend the existing text run.
+ parsed->items_.back().text_end = text_end;
+ } else {
+ // Let's make a new text run.
+ parsed->items_.push_back({false, text_end, {}});
+ }
+ return true;
+ }
+
+ bool ConvertOne(const UnboundConversion &conv, string_view s) {
+ size_t text_end = AppendText(s);
+ parsed->items_.push_back({true, text_end, conv});
+ return true;
+ }
+
+ size_t AppendText(string_view s) {
+ memcpy(data_pos, s.data(), s.size());
+ data_pos += s.size();
+ return static_cast<size_t>(data_pos - parsed->data_.get());
+ }
+
+ ParsedFormatBase *parsed;
+ char* data_pos;
+};
+
+ParsedFormatBase::ParsedFormatBase(
+ string_view format, bool allow_ignored,
+ std::initializer_list<FormatConversionCharSet> convs)
+ : data_(format.empty() ? nullptr : new char[format.size()]) {
+ has_error_ = !ParseFormatString(format, ParsedFormatConsumer(this)) ||
+ !MatchesConversions(allow_ignored, convs);
+}
+
+bool ParsedFormatBase::MatchesConversions(
+ bool allow_ignored,
+ std::initializer_list<FormatConversionCharSet> convs) const {
+ std::unordered_set<int> used;
+ auto add_if_valid_conv = [&](int pos, char c) {
+ if (static_cast<size_t>(pos) > convs.size() ||
+ !Contains(convs.begin()[pos - 1], c))
+ return false;
+ used.insert(pos);
+ return true;
+ };
+ for (const ConversionItem &item : items_) {
+ if (!item.is_conversion) continue;
+ auto &conv = item.conv;
+ if (conv.precision.is_from_arg() &&
+ !add_if_valid_conv(conv.precision.get_from_arg(), '*'))
+ return false;
+ if (conv.width.is_from_arg() &&
+ !add_if_valid_conv(conv.width.get_from_arg(), '*'))
+ return false;
+ if (!add_if_valid_conv(conv.arg_position,
+ FormatConversionCharToChar(conv.conv)))
+ return false;
+ }
+ return used.size() == convs.size() || allow_ignored;
+}
+
+} // namespace str_format_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/strings/internal/str_format/parser.h b/third_party/abseil/src/absl/strings/internal/str_format/parser.h
new file mode 100644
index 0000000..6504dd3
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/internal/str_format/parser.h
@@ -0,0 +1,349 @@
+// Copyright 2020 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_STRINGS_INTERNAL_STR_FORMAT_PARSER_H_
+#define ABSL_STRINGS_INTERNAL_STR_FORMAT_PARSER_H_
+
+#include <limits.h>
+#include <stddef.h>
+#include <stdlib.h>
+
+#include <cassert>
+#include <cstdint>
+#include <initializer_list>
+#include <iosfwd>
+#include <iterator>
+#include <memory>
+#include <string>
+#include <vector>
+
+#include "absl/strings/internal/str_format/checker.h"
+#include "absl/strings/internal/str_format/extension.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace str_format_internal {
+
+enum class LengthMod : std::uint8_t { h, hh, l, ll, L, j, z, t, q, none };
+
+std::string LengthModToString(LengthMod v);
+
+// The analyzed properties of a single specified conversion.
+struct UnboundConversion {
+ UnboundConversion()
+ : flags() /* This is required to zero all the fields of flags. */ {
+ flags.basic = true;
+ }
+
+ class InputValue {
+ public:
+ void set_value(int value) {
+ assert(value >= 0);
+ value_ = value;
+ }
+ int value() const { return value_; }
+
+ // Marks the value as "from arg". aka the '*' format.
+ // Requires `value >= 1`.
+ // When set, is_from_arg() return true and get_from_arg() returns the
+ // original value.
+ // `value()`'s return value is unspecfied in this state.
+ void set_from_arg(int value) {
+ assert(value > 0);
+ value_ = -value - 1;
+ }
+ bool is_from_arg() const { return value_ < -1; }
+ int get_from_arg() const {
+ assert(is_from_arg());
+ return -value_ - 1;
+ }
+
+ private:
+ int value_ = -1;
+ };
+
+ // No need to initialize. It will always be set in the parser.
+ int arg_position;
+
+ InputValue width;
+ InputValue precision;
+
+ Flags flags;
+ LengthMod length_mod = LengthMod::none;
+ FormatConversionChar conv = FormatConversionCharInternal::kNone;
+};
+
+// Consume conversion spec prefix (not including '%') of [p, end) if valid.
+// Examples of valid specs would be e.g.: "s", "d", "-12.6f".
+// If valid, it returns the first character following the conversion spec,
+// and the spec part is broken down and returned in 'conv'.
+// If invalid, returns nullptr.
+const char* ConsumeUnboundConversion(const char* p, const char* end,
+ UnboundConversion* conv, int* next_arg);
+
+// Helper tag class for the table below.
+// It allows fast `char -> ConversionChar/LengthMod` checking and
+// conversions.
+class ConvTag {
+ public:
+ constexpr ConvTag(FormatConversionChar conversion_char) // NOLINT
+ : tag_(static_cast<int8_t>(conversion_char)) {}
+ // We invert the length modifiers to make them negative so that we can easily
+ // test for them.
+ constexpr ConvTag(LengthMod length_mod) // NOLINT
+ : tag_(~static_cast<std::int8_t>(length_mod)) {}
+ // Everything else is -128, which is negative to make is_conv() simpler.
+ constexpr ConvTag() : tag_(-128) {}
+
+ bool is_conv() const { return tag_ >= 0; }
+ bool is_length() const { return tag_ < 0 && tag_ != -128; }
+ FormatConversionChar as_conv() const {
+ assert(is_conv());
+ return static_cast<FormatConversionChar>(tag_);
+ }
+ LengthMod as_length() const {
+ assert(is_length());
+ return static_cast<LengthMod>(~tag_);
+ }
+
+ private:
+ std::int8_t tag_;
+};
+
+extern const ConvTag kTags[256];
+// Keep a single table for all the conversion chars and length modifiers.
+inline ConvTag GetTagForChar(char c) {
+ return kTags[static_cast<unsigned char>(c)];
+}
+
+// Parse the format string provided in 'src' and pass the identified items into
+// 'consumer'.
+// Text runs will be passed by calling
+// Consumer::Append(string_view);
+// ConversionItems will be passed by calling
+// Consumer::ConvertOne(UnboundConversion, string_view);
+// In the case of ConvertOne, the string_view that is passed is the
+// portion of the format string corresponding to the conversion, not including
+// the leading %. On success, it returns true. On failure, it stops and returns
+// false.
+template <typename Consumer>
+bool ParseFormatString(string_view src, Consumer consumer) {
+ int next_arg = 0;
+ const char* p = src.data();
+ const char* const end = p + src.size();
+ while (p != end) {
+ const char* percent = static_cast<const char*>(memchr(p, '%', end - p));
+ if (!percent) {
+ // We found the last substring.
+ return consumer.Append(string_view(p, end - p));
+ }
+ // We found a percent, so push the text run then process the percent.
+ if (ABSL_PREDICT_FALSE(!consumer.Append(string_view(p, percent - p)))) {
+ return false;
+ }
+ if (ABSL_PREDICT_FALSE(percent + 1 >= end)) return false;
+
+ auto tag = GetTagForChar(percent[1]);
+ if (tag.is_conv()) {
+ if (ABSL_PREDICT_FALSE(next_arg < 0)) {
+ // This indicates an error in the format string.
+ // The only way to get `next_arg < 0` here is to have a positional
+ // argument first which sets next_arg to -1 and then a non-positional
+ // argument.
+ return false;
+ }
+ p = percent + 2;
+
+ // Keep this case separate from the one below.
+ // ConvertOne is more efficient when the compiler can see that the `basic`
+ // flag is set.
+ UnboundConversion conv;
+ conv.conv = tag.as_conv();
+ conv.arg_position = ++next_arg;
+ if (ABSL_PREDICT_FALSE(
+ !consumer.ConvertOne(conv, string_view(percent + 1, 1)))) {
+ return false;
+ }
+ } else if (percent[1] != '%') {
+ UnboundConversion conv;
+ p = ConsumeUnboundConversion(percent + 1, end, &conv, &next_arg);
+ if (ABSL_PREDICT_FALSE(p == nullptr)) return false;
+ if (ABSL_PREDICT_FALSE(!consumer.ConvertOne(
+ conv, string_view(percent + 1, p - (percent + 1))))) {
+ return false;
+ }
+ } else {
+ if (ABSL_PREDICT_FALSE(!consumer.Append("%"))) return false;
+ p = percent + 2;
+ continue;
+ }
+ }
+ return true;
+}
+
+// Always returns true, or fails to compile in a constexpr context if s does not
+// point to a constexpr char array.
+constexpr bool EnsureConstexpr(string_view s) {
+ return s.empty() || s[0] == s[0];
+}
+
+class ParsedFormatBase {
+ public:
+ explicit ParsedFormatBase(
+ string_view format, bool allow_ignored,
+ std::initializer_list<FormatConversionCharSet> convs);
+
+ ParsedFormatBase(const ParsedFormatBase& other) { *this = other; }
+
+ ParsedFormatBase(ParsedFormatBase&& other) { *this = std::move(other); }
+
+ ParsedFormatBase& operator=(const ParsedFormatBase& other) {
+ if (this == &other) return *this;
+ has_error_ = other.has_error_;
+ items_ = other.items_;
+ size_t text_size = items_.empty() ? 0 : items_.back().text_end;
+ data_.reset(new char[text_size]);
+ memcpy(data_.get(), other.data_.get(), text_size);
+ return *this;
+ }
+
+ ParsedFormatBase& operator=(ParsedFormatBase&& other) {
+ if (this == &other) return *this;
+ has_error_ = other.has_error_;
+ data_ = std::move(other.data_);
+ items_ = std::move(other.items_);
+ // Reset the vector to make sure the invariants hold.
+ other.items_.clear();
+ return *this;
+ }
+
+ template <typename Consumer>
+ bool ProcessFormat(Consumer consumer) const {
+ const char* const base = data_.get();
+ string_view text(base, 0);
+ for (const auto& item : items_) {
+ const char* const end = text.data() + text.size();
+ text = string_view(end, (base + item.text_end) - end);
+ if (item.is_conversion) {
+ if (!consumer.ConvertOne(item.conv, text)) return false;
+ } else {
+ if (!consumer.Append(text)) return false;
+ }
+ }
+ return !has_error_;
+ }
+
+ bool has_error() const { return has_error_; }
+
+ private:
+ // Returns whether the conversions match and if !allow_ignored it verifies
+ // that all conversions are used by the format.
+ bool MatchesConversions(
+ bool allow_ignored,
+ std::initializer_list<FormatConversionCharSet> convs) const;
+
+ struct ParsedFormatConsumer;
+
+ struct ConversionItem {
+ bool is_conversion;
+ // Points to the past-the-end location of this element in the data_ array.
+ size_t text_end;
+ UnboundConversion conv;
+ };
+
+ bool has_error_;
+ std::unique_ptr<char[]> data_;
+ std::vector<ConversionItem> items_;
+};
+
+
+// A value type representing a preparsed format. These can be created, copied
+// around, and reused to speed up formatting loops.
+// The user must specify through the template arguments the conversion
+// characters used in the format. This will be checked at compile time.
+//
+// This class uses Conv enum values to specify each argument.
+// This allows for more flexibility as you can specify multiple possible
+// conversion characters for each argument.
+// ParsedFormat<char...> is a simplified alias for when the user only
+// needs to specify a single conversion character for each argument.
+//
+// Example:
+// // Extended format supports multiple characters per argument:
+// using MyFormat = ExtendedParsedFormat<Conv::d | Conv::x>;
+// MyFormat GetFormat(bool use_hex) {
+// if (use_hex) return MyFormat("foo %x bar");
+// return MyFormat("foo %d bar");
+// }
+// // 'format' can be used with any value that supports 'd' and 'x',
+// // like `int`.
+// auto format = GetFormat(use_hex);
+// value = StringF(format, i);
+//
+// This class also supports runtime format checking with the ::New() and
+// ::NewAllowIgnored() factory functions.
+// This is the only API that allows the user to pass a runtime specified format
+// string. These factory functions will return NULL if the format does not match
+// the conversions requested by the user.
+template <FormatConversionCharSet... C>
+class ExtendedParsedFormat : public str_format_internal::ParsedFormatBase {
+ public:
+ explicit ExtendedParsedFormat(string_view format)
+#ifdef ABSL_INTERNAL_ENABLE_FORMAT_CHECKER
+ __attribute__((
+ enable_if(str_format_internal::EnsureConstexpr(format),
+ "Format string is not constexpr."),
+ enable_if(str_format_internal::ValidFormatImpl<C...>(format),
+ "Format specified does not match the template arguments.")))
+#endif // ABSL_INTERNAL_ENABLE_FORMAT_CHECKER
+ : ExtendedParsedFormat(format, false) {
+ }
+
+ // ExtendedParsedFormat factory function.
+ // The user still has to specify the conversion characters, but they will not
+ // be checked at compile time. Instead, it will be checked at runtime.
+ // This delays the checking to runtime, but allows the user to pass
+ // dynamically sourced formats.
+ // It returns NULL if the format does not match the conversion characters.
+ // The user is responsible for checking the return value before using it.
+ //
+ // The 'New' variant will check that all the specified arguments are being
+ // consumed by the format and return NULL if any argument is being ignored.
+ // The 'NewAllowIgnored' variant will not verify this and will allow formats
+ // that ignore arguments.
+ static std::unique_ptr<ExtendedParsedFormat> New(string_view format) {
+ return New(format, false);
+ }
+ static std::unique_ptr<ExtendedParsedFormat> NewAllowIgnored(
+ string_view format) {
+ return New(format, true);
+ }
+
+ private:
+ static std::unique_ptr<ExtendedParsedFormat> New(string_view format,
+ bool allow_ignored) {
+ std::unique_ptr<ExtendedParsedFormat> conv(
+ new ExtendedParsedFormat(format, allow_ignored));
+ if (conv->has_error()) return nullptr;
+ return conv;
+ }
+
+ ExtendedParsedFormat(string_view s, bool allow_ignored)
+ : ParsedFormatBase(s, allow_ignored, {C...}) {}
+};
+} // namespace str_format_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_STRINGS_INTERNAL_STR_FORMAT_PARSER_H_
diff --git a/third_party/abseil/src/absl/strings/internal/str_format/parser_test.cc b/third_party/abseil/src/absl/strings/internal/str_format/parser_test.cc
new file mode 100644
index 0000000..a5fa1c7
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/internal/str_format/parser_test.cc
@@ -0,0 +1,427 @@
+// Copyright 2020 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/strings/internal/str_format/parser.h"
+
+#include <string.h>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/base/macros.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace str_format_internal {
+
+namespace {
+
+using testing::Pair;
+
+TEST(LengthModTest, Names) {
+ struct Expectation {
+ int line;
+ LengthMod mod;
+ const char *name;
+ };
+ const Expectation kExpect[] = {
+ {__LINE__, LengthMod::none, "" },
+ {__LINE__, LengthMod::h, "h" },
+ {__LINE__, LengthMod::hh, "hh"},
+ {__LINE__, LengthMod::l, "l" },
+ {__LINE__, LengthMod::ll, "ll"},
+ {__LINE__, LengthMod::L, "L" },
+ {__LINE__, LengthMod::j, "j" },
+ {__LINE__, LengthMod::z, "z" },
+ {__LINE__, LengthMod::t, "t" },
+ {__LINE__, LengthMod::q, "q" },
+ };
+ EXPECT_EQ(ABSL_ARRAYSIZE(kExpect), 10);
+ for (auto e : kExpect) {
+ SCOPED_TRACE(e.line);
+ EXPECT_EQ(e.name, LengthModToString(e.mod));
+ }
+}
+
+TEST(ConversionCharTest, Names) {
+ struct Expectation {
+ FormatConversionChar id;
+ char name;
+ };
+ // clang-format off
+ const Expectation kExpect[] = {
+#define X(c) {FormatConversionCharInternal::c, #c[0]}
+ X(c), X(s), // text
+ X(d), X(i), X(o), X(u), X(x), X(X), // int
+ X(f), X(F), X(e), X(E), X(g), X(G), X(a), X(A), // float
+ X(n), X(p), // misc
+#undef X
+ {FormatConversionCharInternal::kNone, '\0'},
+ };
+ // clang-format on
+ for (auto e : kExpect) {
+ SCOPED_TRACE(e.name);
+ FormatConversionChar v = e.id;
+ EXPECT_EQ(e.name, FormatConversionCharToChar(v));
+ }
+}
+
+class ConsumeUnboundConversionTest : public ::testing::Test {
+ public:
+ std::pair<string_view, string_view> Consume(string_view src) {
+ int next = 0;
+ o = UnboundConversion(); // refresh
+ const char* p = ConsumeUnboundConversion(
+ src.data(), src.data() + src.size(), &o, &next);
+ if (!p) return {{}, src};
+ return {string_view(src.data(), p - src.data()),
+ string_view(p, src.data() + src.size() - p)};
+ }
+
+ bool Run(const char *fmt, bool force_positional = false) {
+ int next = force_positional ? -1 : 0;
+ o = UnboundConversion(); // refresh
+ return ConsumeUnboundConversion(fmt, fmt + strlen(fmt), &o, &next) ==
+ fmt + strlen(fmt);
+ }
+ UnboundConversion o;
+};
+
+TEST_F(ConsumeUnboundConversionTest, ConsumeSpecification) {
+ struct Expectation {
+ int line;
+ string_view src;
+ string_view out;
+ string_view src_post;
+ };
+ const Expectation kExpect[] = {
+ {__LINE__, "", "", "" },
+ {__LINE__, "b", "", "b" }, // 'b' is invalid
+ {__LINE__, "ba", "", "ba"}, // 'b' is invalid
+ {__LINE__, "l", "", "l" }, // just length mod isn't okay
+ {__LINE__, "d", "d", "" }, // basic
+ {__LINE__, "d ", "d", " " }, // leave suffix
+ {__LINE__, "dd", "d", "d" }, // don't be greedy
+ {__LINE__, "d9", "d", "9" }, // leave non-space suffix
+ {__LINE__, "dzz", "d", "zz"}, // length mod as suffix
+ {__LINE__, "1$*2$d", "1$*2$d", "" }, // arg indexing and * allowed.
+ {__LINE__, "0-14.3hhd", "0-14.3hhd", ""}, // precision, width
+ {__LINE__, " 0-+#14.3hhd", " 0-+#14.3hhd", ""}, // flags
+ };
+ for (const auto& e : kExpect) {
+ SCOPED_TRACE(e.line);
+ EXPECT_THAT(Consume(e.src), Pair(e.out, e.src_post));
+ }
+}
+
+TEST_F(ConsumeUnboundConversionTest, BasicConversion) {
+ EXPECT_FALSE(Run(""));
+ EXPECT_FALSE(Run("z"));
+
+ EXPECT_FALSE(Run("dd")); // no excess allowed
+
+ EXPECT_TRUE(Run("d"));
+ EXPECT_EQ('d', FormatConversionCharToChar(o.conv));
+ EXPECT_FALSE(o.width.is_from_arg());
+ EXPECT_LT(o.width.value(), 0);
+ EXPECT_FALSE(o.precision.is_from_arg());
+ EXPECT_LT(o.precision.value(), 0);
+ EXPECT_EQ(1, o.arg_position);
+}
+
+TEST_F(ConsumeUnboundConversionTest, ArgPosition) {
+ EXPECT_TRUE(Run("d"));
+ EXPECT_EQ(1, o.arg_position);
+ EXPECT_TRUE(Run("3$d"));
+ EXPECT_EQ(3, o.arg_position);
+ EXPECT_TRUE(Run("1$d"));
+ EXPECT_EQ(1, o.arg_position);
+ EXPECT_TRUE(Run("1$d", true));
+ EXPECT_EQ(1, o.arg_position);
+ EXPECT_TRUE(Run("123$d"));
+ EXPECT_EQ(123, o.arg_position);
+ EXPECT_TRUE(Run("123$d", true));
+ EXPECT_EQ(123, o.arg_position);
+ EXPECT_TRUE(Run("10$d"));
+ EXPECT_EQ(10, o.arg_position);
+ EXPECT_TRUE(Run("10$d", true));
+ EXPECT_EQ(10, o.arg_position);
+
+ // Position can't be zero.
+ EXPECT_FALSE(Run("0$d"));
+ EXPECT_FALSE(Run("0$d", true));
+ EXPECT_FALSE(Run("1$*0$d"));
+ EXPECT_FALSE(Run("1$.*0$d"));
+
+ // Position can't start with a zero digit at all. That is not a 'decimal'.
+ EXPECT_FALSE(Run("01$p"));
+ EXPECT_FALSE(Run("01$p", true));
+ EXPECT_FALSE(Run("1$*01$p"));
+ EXPECT_FALSE(Run("1$.*01$p"));
+}
+
+TEST_F(ConsumeUnboundConversionTest, WidthAndPrecision) {
+ EXPECT_TRUE(Run("14d"));
+ EXPECT_EQ('d', FormatConversionCharToChar(o.conv));
+ EXPECT_FALSE(o.width.is_from_arg());
+ EXPECT_EQ(14, o.width.value());
+ EXPECT_FALSE(o.precision.is_from_arg());
+ EXPECT_LT(o.precision.value(), 0);
+
+ EXPECT_TRUE(Run("14.d"));
+ EXPECT_FALSE(o.width.is_from_arg());
+ EXPECT_FALSE(o.precision.is_from_arg());
+ EXPECT_EQ(14, o.width.value());
+ EXPECT_EQ(0, o.precision.value());
+
+ EXPECT_TRUE(Run(".d"));
+ EXPECT_FALSE(o.width.is_from_arg());
+ EXPECT_LT(o.width.value(), 0);
+ EXPECT_FALSE(o.precision.is_from_arg());
+ EXPECT_EQ(0, o.precision.value());
+
+ EXPECT_TRUE(Run(".5d"));
+ EXPECT_FALSE(o.width.is_from_arg());
+ EXPECT_LT(o.width.value(), 0);
+ EXPECT_FALSE(o.precision.is_from_arg());
+ EXPECT_EQ(5, o.precision.value());
+
+ EXPECT_TRUE(Run(".0d"));
+ EXPECT_FALSE(o.width.is_from_arg());
+ EXPECT_LT(o.width.value(), 0);
+ EXPECT_FALSE(o.precision.is_from_arg());
+ EXPECT_EQ(0, o.precision.value());
+
+ EXPECT_TRUE(Run("14.5d"));
+ EXPECT_FALSE(o.width.is_from_arg());
+ EXPECT_FALSE(o.precision.is_from_arg());
+ EXPECT_EQ(14, o.width.value());
+ EXPECT_EQ(5, o.precision.value());
+
+ EXPECT_TRUE(Run("*.*d"));
+ EXPECT_TRUE(o.width.is_from_arg());
+ EXPECT_EQ(1, o.width.get_from_arg());
+ EXPECT_TRUE(o.precision.is_from_arg());
+ EXPECT_EQ(2, o.precision.get_from_arg());
+ EXPECT_EQ(3, o.arg_position);
+
+ EXPECT_TRUE(Run("*d"));
+ EXPECT_TRUE(o.width.is_from_arg());
+ EXPECT_EQ(1, o.width.get_from_arg());
+ EXPECT_FALSE(o.precision.is_from_arg());
+ EXPECT_LT(o.precision.value(), 0);
+ EXPECT_EQ(2, o.arg_position);
+
+ EXPECT_TRUE(Run(".*d"));
+ EXPECT_FALSE(o.width.is_from_arg());
+ EXPECT_LT(o.width.value(), 0);
+ EXPECT_TRUE(o.precision.is_from_arg());
+ EXPECT_EQ(1, o.precision.get_from_arg());
+ EXPECT_EQ(2, o.arg_position);
+
+ // mixed implicit and explicit: didn't specify arg position.
+ EXPECT_FALSE(Run("*23$.*34$d"));
+
+ EXPECT_TRUE(Run("12$*23$.*34$d"));
+ EXPECT_EQ(12, o.arg_position);
+ EXPECT_TRUE(o.width.is_from_arg());
+ EXPECT_EQ(23, o.width.get_from_arg());
+ EXPECT_TRUE(o.precision.is_from_arg());
+ EXPECT_EQ(34, o.precision.get_from_arg());
+
+ EXPECT_TRUE(Run("2$*5$.*9$d"));
+ EXPECT_EQ(2, o.arg_position);
+ EXPECT_TRUE(o.width.is_from_arg());
+ EXPECT_EQ(5, o.width.get_from_arg());
+ EXPECT_TRUE(o.precision.is_from_arg());
+ EXPECT_EQ(9, o.precision.get_from_arg());
+
+ EXPECT_FALSE(Run(".*0$d")) << "no arg 0";
+
+ // Large values
+ EXPECT_TRUE(Run("999999999.999999999d"));
+ EXPECT_FALSE(o.width.is_from_arg());
+ EXPECT_EQ(999999999, o.width.value());
+ EXPECT_FALSE(o.precision.is_from_arg());
+ EXPECT_EQ(999999999, o.precision.value());
+
+ EXPECT_FALSE(Run("1000000000.999999999d"));
+ EXPECT_FALSE(Run("999999999.1000000000d"));
+ EXPECT_FALSE(Run("9999999999d"));
+ EXPECT_FALSE(Run(".9999999999d"));
+}
+
+TEST_F(ConsumeUnboundConversionTest, Flags) {
+ static const char kAllFlags[] = "-+ #0";
+ static const int kNumFlags = ABSL_ARRAYSIZE(kAllFlags) - 1;
+ for (int rev = 0; rev < 2; ++rev) {
+ for (int i = 0; i < 1 << kNumFlags; ++i) {
+ std::string fmt;
+ for (int k = 0; k < kNumFlags; ++k)
+ if ((i >> k) & 1) fmt += kAllFlags[k];
+ // flag order shouldn't matter
+ if (rev == 1) { std::reverse(fmt.begin(), fmt.end()); }
+ fmt += 'd';
+ SCOPED_TRACE(fmt);
+ EXPECT_TRUE(Run(fmt.c_str()));
+ EXPECT_EQ(fmt.find('-') == std::string::npos, !o.flags.left);
+ EXPECT_EQ(fmt.find('+') == std::string::npos, !o.flags.show_pos);
+ EXPECT_EQ(fmt.find(' ') == std::string::npos, !o.flags.sign_col);
+ EXPECT_EQ(fmt.find('#') == std::string::npos, !o.flags.alt);
+ EXPECT_EQ(fmt.find('0') == std::string::npos, !o.flags.zero);
+ }
+ }
+}
+
+TEST_F(ConsumeUnboundConversionTest, BasicFlag) {
+ // Flag is on
+ for (const char* fmt : {"d", "llx", "G", "1$X"}) {
+ SCOPED_TRACE(fmt);
+ EXPECT_TRUE(Run(fmt));
+ EXPECT_TRUE(o.flags.basic);
+ }
+
+ // Flag is off
+ for (const char* fmt : {"3d", ".llx", "-G", "1$#X"}) {
+ SCOPED_TRACE(fmt);
+ EXPECT_TRUE(Run(fmt));
+ EXPECT_FALSE(o.flags.basic);
+ }
+}
+
+TEST_F(ConsumeUnboundConversionTest, LengthMod) {
+ EXPECT_TRUE(Run("d"));
+ EXPECT_EQ(LengthMod::none, o.length_mod);
+ EXPECT_TRUE(Run("hd"));
+ EXPECT_EQ(LengthMod::h, o.length_mod);
+ EXPECT_TRUE(Run("hhd"));
+ EXPECT_EQ(LengthMod::hh, o.length_mod);
+ EXPECT_TRUE(Run("ld"));
+ EXPECT_EQ(LengthMod::l, o.length_mod);
+ EXPECT_TRUE(Run("lld"));
+ EXPECT_EQ(LengthMod::ll, o.length_mod);
+ EXPECT_TRUE(Run("Lf"));
+ EXPECT_EQ(LengthMod::L, o.length_mod);
+ EXPECT_TRUE(Run("qf"));
+ EXPECT_EQ(LengthMod::q, o.length_mod);
+ EXPECT_TRUE(Run("jd"));
+ EXPECT_EQ(LengthMod::j, o.length_mod);
+ EXPECT_TRUE(Run("zd"));
+ EXPECT_EQ(LengthMod::z, o.length_mod);
+ EXPECT_TRUE(Run("td"));
+ EXPECT_EQ(LengthMod::t, o.length_mod);
+}
+
+struct SummarizeConsumer {
+ std::string* out;
+ explicit SummarizeConsumer(std::string* out) : out(out) {}
+
+ bool Append(string_view s) {
+ *out += "[" + std::string(s) + "]";
+ return true;
+ }
+
+ bool ConvertOne(const UnboundConversion& conv, string_view s) {
+ *out += "{";
+ *out += std::string(s);
+ *out += ":";
+ *out += std::to_string(conv.arg_position) + "$";
+ if (conv.width.is_from_arg()) {
+ *out += std::to_string(conv.width.get_from_arg()) + "$*";
+ }
+ if (conv.precision.is_from_arg()) {
+ *out += "." + std::to_string(conv.precision.get_from_arg()) + "$*";
+ }
+ *out += FormatConversionCharToChar(conv.conv);
+ *out += "}";
+ return true;
+ }
+};
+
+std::string SummarizeParsedFormat(const ParsedFormatBase& pc) {
+ std::string out;
+ if (!pc.ProcessFormat(SummarizeConsumer(&out))) out += "!";
+ return out;
+}
+
+class ParsedFormatTest : public testing::Test {};
+
+TEST_F(ParsedFormatTest, ValueSemantics) {
+ ParsedFormatBase p1({}, true, {}); // empty format
+ EXPECT_EQ("", SummarizeParsedFormat(p1));
+
+ ParsedFormatBase p2 = p1; // copy construct (empty)
+ EXPECT_EQ(SummarizeParsedFormat(p1), SummarizeParsedFormat(p2));
+
+ p1 = ParsedFormatBase("hello%s", true,
+ {FormatConversionCharSetInternal::s}); // move assign
+ EXPECT_EQ("[hello]{s:1$s}", SummarizeParsedFormat(p1));
+
+ ParsedFormatBase p3 = p1; // copy construct (nonempty)
+ EXPECT_EQ(SummarizeParsedFormat(p1), SummarizeParsedFormat(p3));
+
+ using std::swap;
+ swap(p1, p2);
+ EXPECT_EQ("", SummarizeParsedFormat(p1));
+ EXPECT_EQ("[hello]{s:1$s}", SummarizeParsedFormat(p2));
+ swap(p1, p2); // undo
+
+ p2 = p1; // copy assign
+ EXPECT_EQ(SummarizeParsedFormat(p1), SummarizeParsedFormat(p2));
+}
+
+struct ExpectParse {
+ const char* in;
+ std::initializer_list<FormatConversionCharSet> conv_set;
+ const char* out;
+};
+
+TEST_F(ParsedFormatTest, Parsing) {
+ // Parse should be equivalent to that obtained by ConversionParseIterator.
+ // No need to retest the parsing edge cases here.
+ const ExpectParse kExpect[] = {
+ {"", {}, ""},
+ {"ab", {}, "[ab]"},
+ {"a%d", {FormatConversionCharSetInternal::d}, "[a]{d:1$d}"},
+ {"a%+d", {FormatConversionCharSetInternal::d}, "[a]{+d:1$d}"},
+ {"a% d", {FormatConversionCharSetInternal::d}, "[a]{ d:1$d}"},
+ {"a%b %d", {}, "[a]!"}, // stop after error
+ };
+ for (const auto& e : kExpect) {
+ SCOPED_TRACE(e.in);
+ EXPECT_EQ(e.out,
+ SummarizeParsedFormat(ParsedFormatBase(e.in, false, e.conv_set)));
+ }
+}
+
+TEST_F(ParsedFormatTest, ParsingFlagOrder) {
+ const ExpectParse kExpect[] = {
+ {"a%+ 0d", {FormatConversionCharSetInternal::d}, "[a]{+ 0d:1$d}"},
+ {"a%+0 d", {FormatConversionCharSetInternal::d}, "[a]{+0 d:1$d}"},
+ {"a%0+ d", {FormatConversionCharSetInternal::d}, "[a]{0+ d:1$d}"},
+ {"a% +0d", {FormatConversionCharSetInternal::d}, "[a]{ +0d:1$d}"},
+ {"a%0 +d", {FormatConversionCharSetInternal::d}, "[a]{0 +d:1$d}"},
+ {"a% 0+d", {FormatConversionCharSetInternal::d}, "[a]{ 0+d:1$d}"},
+ {"a%+ 0+d", {FormatConversionCharSetInternal::d}, "[a]{+ 0+d:1$d}"},
+ };
+ for (const auto& e : kExpect) {
+ SCOPED_TRACE(e.in);
+ EXPECT_EQ(e.out,
+ SummarizeParsedFormat(ParsedFormatBase(e.in, false, e.conv_set)));
+ }
+}
+
+} // namespace
+} // namespace str_format_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/strings/internal/str_join_internal.h b/third_party/abseil/src/absl/strings/internal/str_join_internal.h
new file mode 100644
index 0000000..31dbf67
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/internal/str_join_internal.h
@@ -0,0 +1,314 @@
+//
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+// This file declares INTERNAL parts of the Join API that are inlined/templated
+// or otherwise need to be available at compile time. The main abstractions
+// defined in this file are:
+//
+// - A handful of default Formatters
+// - JoinAlgorithm() overloads
+// - JoinRange() overloads
+// - JoinTuple()
+//
+// DO NOT INCLUDE THIS FILE DIRECTLY. Use this file by including
+// absl/strings/str_join.h
+//
+// IWYU pragma: private, include "absl/strings/str_join.h"
+
+#ifndef ABSL_STRINGS_INTERNAL_STR_JOIN_INTERNAL_H_
+#define ABSL_STRINGS_INTERNAL_STR_JOIN_INTERNAL_H_
+
+#include <cstring>
+#include <iterator>
+#include <memory>
+#include <string>
+#include <type_traits>
+#include <utility>
+
+#include "absl/strings/internal/ostringstream.h"
+#include "absl/strings/internal/resize_uninitialized.h"
+#include "absl/strings/str_cat.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace strings_internal {
+
+//
+// Formatter objects
+//
+// The following are implementation classes for standard Formatter objects. The
+// factory functions that users will call to create and use these formatters are
+// defined and documented in strings/join.h.
+//
+
+// The default formatter. Converts alpha-numeric types to strings.
+struct AlphaNumFormatterImpl {
+ // This template is needed in order to support passing in a dereferenced
+ // vector<bool>::iterator
+ template <typename T>
+ void operator()(std::string* out, const T& t) const {
+ StrAppend(out, AlphaNum(t));
+ }
+
+ void operator()(std::string* out, const AlphaNum& t) const {
+ StrAppend(out, t);
+ }
+};
+
+// A type that's used to overload the JoinAlgorithm() function (defined below)
+// for ranges that do not require additional formatting (e.g., a range of
+// strings).
+
+struct NoFormatter : public AlphaNumFormatterImpl {};
+
+// Formats types to strings using the << operator.
+class StreamFormatterImpl {
+ public:
+ // The method isn't const because it mutates state. Making it const will
+ // render StreamFormatterImpl thread-hostile.
+ template <typename T>
+ void operator()(std::string* out, const T& t) {
+ // The stream is created lazily to avoid paying the relatively high cost
+ // of its construction when joining an empty range.
+ if (strm_) {
+ strm_->clear(); // clear the bad, fail and eof bits in case they were set
+ strm_->str(out);
+ } else {
+ strm_.reset(new strings_internal::OStringStream(out));
+ }
+ *strm_ << t;
+ }
+
+ private:
+ std::unique_ptr<strings_internal::OStringStream> strm_;
+};
+
+// Formats a std::pair<>. The 'first' member is formatted using f1_ and the
+// 'second' member is formatted using f2_. sep_ is the separator.
+template <typename F1, typename F2>
+class PairFormatterImpl {
+ public:
+ PairFormatterImpl(F1 f1, absl::string_view sep, F2 f2)
+ : f1_(std::move(f1)), sep_(sep), f2_(std::move(f2)) {}
+
+ template <typename T>
+ void operator()(std::string* out, const T& p) {
+ f1_(out, p.first);
+ out->append(sep_);
+ f2_(out, p.second);
+ }
+
+ template <typename T>
+ void operator()(std::string* out, const T& p) const {
+ f1_(out, p.first);
+ out->append(sep_);
+ f2_(out, p.second);
+ }
+
+ private:
+ F1 f1_;
+ std::string sep_;
+ F2 f2_;
+};
+
+// Wraps another formatter and dereferences the argument to operator() then
+// passes the dereferenced argument to the wrapped formatter. This can be
+// useful, for example, to join a std::vector<int*>.
+template <typename Formatter>
+class DereferenceFormatterImpl {
+ public:
+ DereferenceFormatterImpl() : f_() {}
+ explicit DereferenceFormatterImpl(Formatter&& f)
+ : f_(std::forward<Formatter>(f)) {}
+
+ template <typename T>
+ void operator()(std::string* out, const T& t) {
+ f_(out, *t);
+ }
+
+ template <typename T>
+ void operator()(std::string* out, const T& t) const {
+ f_(out, *t);
+ }
+
+ private:
+ Formatter f_;
+};
+
+// DefaultFormatter<T> is a traits class that selects a default Formatter to use
+// for the given type T. The ::Type member names the Formatter to use. This is
+// used by the strings::Join() functions that do NOT take a Formatter argument,
+// in which case a default Formatter must be chosen.
+//
+// AlphaNumFormatterImpl is the default in the base template, followed by
+// specializations for other types.
+template <typename ValueType>
+struct DefaultFormatter {
+ typedef AlphaNumFormatterImpl Type;
+};
+template <>
+struct DefaultFormatter<const char*> {
+ typedef AlphaNumFormatterImpl Type;
+};
+template <>
+struct DefaultFormatter<char*> {
+ typedef AlphaNumFormatterImpl Type;
+};
+template <>
+struct DefaultFormatter<std::string> {
+ typedef NoFormatter Type;
+};
+template <>
+struct DefaultFormatter<absl::string_view> {
+ typedef NoFormatter Type;
+};
+template <typename ValueType>
+struct DefaultFormatter<ValueType*> {
+ typedef DereferenceFormatterImpl<typename DefaultFormatter<ValueType>::Type>
+ Type;
+};
+
+template <typename ValueType>
+struct DefaultFormatter<std::unique_ptr<ValueType>>
+ : public DefaultFormatter<ValueType*> {};
+
+//
+// JoinAlgorithm() functions
+//
+
+// The main joining algorithm. This simply joins the elements in the given
+// iterator range, each separated by the given separator, into an output string,
+// and formats each element using the provided Formatter object.
+template <typename Iterator, typename Formatter>
+std::string JoinAlgorithm(Iterator start, Iterator end, absl::string_view s,
+ Formatter&& f) {
+ std::string result;
+ absl::string_view sep("");
+ for (Iterator it = start; it != end; ++it) {
+ result.append(sep.data(), sep.size());
+ f(&result, *it);
+ sep = s;
+ }
+ return result;
+}
+
+// A joining algorithm that's optimized for a forward iterator range of
+// string-like objects that do not need any additional formatting. This is to
+// optimize the common case of joining, say, a std::vector<string> or a
+// std::vector<absl::string_view>.
+//
+// This is an overload of the previous JoinAlgorithm() function. Here the
+// Formatter argument is of type NoFormatter. Since NoFormatter is an internal
+// type, this overload is only invoked when strings::Join() is called with a
+// range of string-like objects (e.g., std::string, absl::string_view), and an
+// explicit Formatter argument was NOT specified.
+//
+// The optimization is that the needed space will be reserved in the output
+// string to avoid the need to resize while appending. To do this, the iterator
+// range will be traversed twice: once to calculate the total needed size, and
+// then again to copy the elements and delimiters to the output string.
+template <typename Iterator,
+ typename = typename std::enable_if<std::is_convertible<
+ typename std::iterator_traits<Iterator>::iterator_category,
+ std::forward_iterator_tag>::value>::type>
+std::string JoinAlgorithm(Iterator start, Iterator end, absl::string_view s,
+ NoFormatter) {
+ std::string result;
+ if (start != end) {
+ // Sums size
+ size_t result_size = start->size();
+ for (Iterator it = start; ++it != end;) {
+ result_size += s.size();
+ result_size += it->size();
+ }
+
+ if (result_size > 0) {
+ STLStringResizeUninitialized(&result, result_size);
+
+ // Joins strings
+ char* result_buf = &*result.begin();
+ memcpy(result_buf, start->data(), start->size());
+ result_buf += start->size();
+ for (Iterator it = start; ++it != end;) {
+ memcpy(result_buf, s.data(), s.size());
+ result_buf += s.size();
+ memcpy(result_buf, it->data(), it->size());
+ result_buf += it->size();
+ }
+ }
+ }
+
+ return result;
+}
+
+// JoinTupleLoop implements a loop over the elements of a std::tuple, which
+// are heterogeneous. The primary template matches the tuple interior case. It
+// continues the iteration after appending a separator (for nonzero indices)
+// and formatting an element of the tuple. The specialization for the I=N case
+// matches the end-of-tuple, and terminates the iteration.
+template <size_t I, size_t N>
+struct JoinTupleLoop {
+ template <typename Tup, typename Formatter>
+ void operator()(std::string* out, const Tup& tup, absl::string_view sep,
+ Formatter&& fmt) {
+ if (I > 0) out->append(sep.data(), sep.size());
+ fmt(out, std::get<I>(tup));
+ JoinTupleLoop<I + 1, N>()(out, tup, sep, fmt);
+ }
+};
+template <size_t N>
+struct JoinTupleLoop<N, N> {
+ template <typename Tup, typename Formatter>
+ void operator()(std::string*, const Tup&, absl::string_view, Formatter&&) {}
+};
+
+template <typename... T, typename Formatter>
+std::string JoinAlgorithm(const std::tuple<T...>& tup, absl::string_view sep,
+ Formatter&& fmt) {
+ std::string result;
+ JoinTupleLoop<0, sizeof...(T)>()(&result, tup, sep, fmt);
+ return result;
+}
+
+template <typename Iterator>
+std::string JoinRange(Iterator first, Iterator last,
+ absl::string_view separator) {
+ // No formatter was explicitly given, so a default must be chosen.
+ typedef typename std::iterator_traits<Iterator>::value_type ValueType;
+ typedef typename DefaultFormatter<ValueType>::Type Formatter;
+ return JoinAlgorithm(first, last, separator, Formatter());
+}
+
+template <typename Range, typename Formatter>
+std::string JoinRange(const Range& range, absl::string_view separator,
+ Formatter&& fmt) {
+ using std::begin;
+ using std::end;
+ return JoinAlgorithm(begin(range), end(range), separator, fmt);
+}
+
+template <typename Range>
+std::string JoinRange(const Range& range, absl::string_view separator) {
+ using std::begin;
+ using std::end;
+ return JoinRange(begin(range), end(range), separator);
+}
+
+} // namespace strings_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_STRINGS_INTERNAL_STR_JOIN_INTERNAL_H_
diff --git a/third_party/abseil/src/absl/strings/internal/str_split_internal.h b/third_party/abseil/src/absl/strings/internal/str_split_internal.h
new file mode 100644
index 0000000..a2f41c1
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/internal/str_split_internal.h
@@ -0,0 +1,430 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+// This file declares INTERNAL parts of the Split API that are inline/templated
+// or otherwise need to be available at compile time. The main abstractions
+// defined in here are
+//
+// - ConvertibleToStringView
+// - SplitIterator<>
+// - Splitter<>
+//
+// DO NOT INCLUDE THIS FILE DIRECTLY. Use this file by including
+// absl/strings/str_split.h.
+//
+// IWYU pragma: private, include "absl/strings/str_split.h"
+
+#ifndef ABSL_STRINGS_INTERNAL_STR_SPLIT_INTERNAL_H_
+#define ABSL_STRINGS_INTERNAL_STR_SPLIT_INTERNAL_H_
+
+#include <array>
+#include <initializer_list>
+#include <iterator>
+#include <map>
+#include <type_traits>
+#include <utility>
+#include <vector>
+
+#include "absl/base/macros.h"
+#include "absl/base/port.h"
+#include "absl/meta/type_traits.h"
+#include "absl/strings/string_view.h"
+
+#ifdef _GLIBCXX_DEBUG
+#include "absl/strings/internal/stl_type_traits.h"
+#endif // _GLIBCXX_DEBUG
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace strings_internal {
+
+// This class is implicitly constructible from everything that absl::string_view
+// is implicitly constructible from, except for rvalue strings. This means it
+// can be used as a function parameter in places where passing a temporary
+// string might cause memory lifetime issues.
+class ConvertibleToStringView {
+ public:
+ ConvertibleToStringView(const char* s) // NOLINT(runtime/explicit)
+ : value_(s) {}
+ ConvertibleToStringView(char* s) : value_(s) {} // NOLINT(runtime/explicit)
+ ConvertibleToStringView(absl::string_view s) // NOLINT(runtime/explicit)
+ : value_(s) {}
+ ConvertibleToStringView(const std::string& s) // NOLINT(runtime/explicit)
+ : value_(s) {}
+
+ // Matches rvalue strings and moves their data to a member.
+ ConvertibleToStringView(std::string&& s) = delete;
+ ConvertibleToStringView(const std::string&& s) = delete;
+
+ absl::string_view value() const { return value_; }
+
+ private:
+ absl::string_view value_;
+};
+
+// An iterator that enumerates the parts of a string from a Splitter. The text
+// to be split, the Delimiter, and the Predicate are all taken from the given
+// Splitter object. Iterators may only be compared if they refer to the same
+// Splitter instance.
+//
+// This class is NOT part of the public splitting API.
+template <typename Splitter>
+class SplitIterator {
+ public:
+ using iterator_category = std::input_iterator_tag;
+ using value_type = absl::string_view;
+ using difference_type = ptrdiff_t;
+ using pointer = const value_type*;
+ using reference = const value_type&;
+
+ enum State { kInitState, kLastState, kEndState };
+ SplitIterator(State state, const Splitter* splitter)
+ : pos_(0),
+ state_(state),
+ splitter_(splitter),
+ delimiter_(splitter->delimiter()),
+ predicate_(splitter->predicate()) {
+ // Hack to maintain backward compatibility. This one block makes it so an
+ // empty absl::string_view whose .data() happens to be nullptr behaves
+ // *differently* from an otherwise empty absl::string_view whose .data() is
+ // not nullptr. This is an undesirable difference in general, but this
+ // behavior is maintained to avoid breaking existing code that happens to
+ // depend on this old behavior/bug. Perhaps it will be fixed one day. The
+ // difference in behavior is as follows:
+ // Split(absl::string_view(""), '-'); // {""}
+ // Split(absl::string_view(), '-'); // {}
+ if (splitter_->text().data() == nullptr) {
+ state_ = kEndState;
+ pos_ = splitter_->text().size();
+ return;
+ }
+
+ if (state_ == kEndState) {
+ pos_ = splitter_->text().size();
+ } else {
+ ++(*this);
+ }
+ }
+
+ bool at_end() const { return state_ == kEndState; }
+
+ reference operator*() const { return curr_; }
+ pointer operator->() const { return &curr_; }
+
+ SplitIterator& operator++() {
+ do {
+ if (state_ == kLastState) {
+ state_ = kEndState;
+ return *this;
+ }
+ const absl::string_view text = splitter_->text();
+ const absl::string_view d = delimiter_.Find(text, pos_);
+ if (d.data() == text.data() + text.size()) state_ = kLastState;
+ curr_ = text.substr(pos_, d.data() - (text.data() + pos_));
+ pos_ += curr_.size() + d.size();
+ } while (!predicate_(curr_));
+ return *this;
+ }
+
+ SplitIterator operator++(int) {
+ SplitIterator old(*this);
+ ++(*this);
+ return old;
+ }
+
+ friend bool operator==(const SplitIterator& a, const SplitIterator& b) {
+ return a.state_ == b.state_ && a.pos_ == b.pos_;
+ }
+
+ friend bool operator!=(const SplitIterator& a, const SplitIterator& b) {
+ return !(a == b);
+ }
+
+ private:
+ size_t pos_;
+ State state_;
+ absl::string_view curr_;
+ const Splitter* splitter_;
+ typename Splitter::DelimiterType delimiter_;
+ typename Splitter::PredicateType predicate_;
+};
+
+// HasMappedType<T>::value is true iff there exists a type T::mapped_type.
+template <typename T, typename = void>
+struct HasMappedType : std::false_type {};
+template <typename T>
+struct HasMappedType<T, absl::void_t<typename T::mapped_type>>
+ : std::true_type {};
+
+// HasValueType<T>::value is true iff there exists a type T::value_type.
+template <typename T, typename = void>
+struct HasValueType : std::false_type {};
+template <typename T>
+struct HasValueType<T, absl::void_t<typename T::value_type>> : std::true_type {
+};
+
+// HasConstIterator<T>::value is true iff there exists a type T::const_iterator.
+template <typename T, typename = void>
+struct HasConstIterator : std::false_type {};
+template <typename T>
+struct HasConstIterator<T, absl::void_t<typename T::const_iterator>>
+ : std::true_type {};
+
+// IsInitializerList<T>::value is true iff T is an std::initializer_list. More
+// details below in Splitter<> where this is used.
+std::false_type IsInitializerListDispatch(...); // default: No
+template <typename T>
+std::true_type IsInitializerListDispatch(std::initializer_list<T>*);
+template <typename T>
+struct IsInitializerList
+ : decltype(IsInitializerListDispatch(static_cast<T*>(nullptr))) {};
+
+// A SplitterIsConvertibleTo<C>::type alias exists iff the specified condition
+// is true for type 'C'.
+//
+// Restricts conversion to container-like types (by testing for the presence of
+// a const_iterator member type) and also to disable conversion to an
+// std::initializer_list (which also has a const_iterator). Otherwise, code
+// compiled in C++11 will get an error due to ambiguous conversion paths (in
+// C++11 std::vector<T>::operator= is overloaded to take either a std::vector<T>
+// or an std::initializer_list<T>).
+
+template <typename C, bool has_value_type, bool has_mapped_type>
+struct SplitterIsConvertibleToImpl : std::false_type {};
+
+template <typename C>
+struct SplitterIsConvertibleToImpl<C, true, false>
+ : std::is_constructible<typename C::value_type, absl::string_view> {};
+
+template <typename C>
+struct SplitterIsConvertibleToImpl<C, true, true>
+ : absl::conjunction<
+ std::is_constructible<typename C::key_type, absl::string_view>,
+ std::is_constructible<typename C::mapped_type, absl::string_view>> {};
+
+template <typename C>
+struct SplitterIsConvertibleTo
+ : SplitterIsConvertibleToImpl<
+ C,
+#ifdef _GLIBCXX_DEBUG
+ !IsStrictlyBaseOfAndConvertibleToSTLContainer<C>::value &&
+#endif // _GLIBCXX_DEBUG
+ !IsInitializerList<
+ typename std::remove_reference<C>::type>::value &&
+ HasValueType<C>::value && HasConstIterator<C>::value,
+ HasMappedType<C>::value> {
+};
+
+// This class implements the range that is returned by absl::StrSplit(). This
+// class has templated conversion operators that allow it to be implicitly
+// converted to a variety of types that the caller may have specified on the
+// left-hand side of an assignment.
+//
+// The main interface for interacting with this class is through its implicit
+// conversion operators. However, this class may also be used like a container
+// in that it has .begin() and .end() member functions. It may also be used
+// within a range-for loop.
+//
+// Output containers can be collections of any type that is constructible from
+// an absl::string_view.
+//
+// An Predicate functor may be supplied. This predicate will be used to filter
+// the split strings: only strings for which the predicate returns true will be
+// kept. A Predicate object is any unary functor that takes an absl::string_view
+// and returns bool.
+//
+// The StringType parameter can be either string_view or string, depending on
+// whether the Splitter refers to a string stored elsewhere, or if the string
+// resides inside the Splitter itself.
+template <typename Delimiter, typename Predicate, typename StringType>
+class Splitter {
+ public:
+ using DelimiterType = Delimiter;
+ using PredicateType = Predicate;
+ using const_iterator = strings_internal::SplitIterator<Splitter>;
+ using value_type = typename std::iterator_traits<const_iterator>::value_type;
+
+ Splitter(StringType input_text, Delimiter d, Predicate p)
+ : text_(std::move(input_text)),
+ delimiter_(std::move(d)),
+ predicate_(std::move(p)) {}
+
+ absl::string_view text() const { return text_; }
+ const Delimiter& delimiter() const { return delimiter_; }
+ const Predicate& predicate() const { return predicate_; }
+
+ // Range functions that iterate the split substrings as absl::string_view
+ // objects. These methods enable a Splitter to be used in a range-based for
+ // loop.
+ const_iterator begin() const { return {const_iterator::kInitState, this}; }
+ const_iterator end() const { return {const_iterator::kEndState, this}; }
+
+ // An implicit conversion operator that is restricted to only those containers
+ // that the splitter is convertible to.
+ template <typename Container,
+ typename = typename std::enable_if<
+ SplitterIsConvertibleTo<Container>::value>::type>
+ operator Container() const { // NOLINT(runtime/explicit)
+ return ConvertToContainer<Container, typename Container::value_type,
+ HasMappedType<Container>::value>()(*this);
+ }
+
+ // Returns a pair with its .first and .second members set to the first two
+ // strings returned by the begin() iterator. Either/both of .first and .second
+ // will be constructed with empty strings if the iterator doesn't have a
+ // corresponding value.
+ template <typename First, typename Second>
+ operator std::pair<First, Second>() const { // NOLINT(runtime/explicit)
+ absl::string_view first, second;
+ auto it = begin();
+ if (it != end()) {
+ first = *it;
+ if (++it != end()) {
+ second = *it;
+ }
+ }
+ return {First(first), Second(second)};
+ }
+
+ private:
+ // ConvertToContainer is a functor converting a Splitter to the requested
+ // Container of ValueType. It is specialized below to optimize splitting to
+ // certain combinations of Container and ValueType.
+ //
+ // This base template handles the generic case of storing the split results in
+ // the requested non-map-like container and converting the split substrings to
+ // the requested type.
+ template <typename Container, typename ValueType, bool is_map = false>
+ struct ConvertToContainer {
+ Container operator()(const Splitter& splitter) const {
+ Container c;
+ auto it = std::inserter(c, c.end());
+ for (const auto& sp : splitter) {
+ *it++ = ValueType(sp);
+ }
+ return c;
+ }
+ };
+
+ // Partial specialization for a std::vector<absl::string_view>.
+ //
+ // Optimized for the common case of splitting to a
+ // std::vector<absl::string_view>. In this case we first split the results to
+ // a small array of absl::string_view on the stack, to reduce reallocations.
+ template <typename A>
+ struct ConvertToContainer<std::vector<absl::string_view, A>,
+ absl::string_view, false> {
+ std::vector<absl::string_view, A> operator()(
+ const Splitter& splitter) const {
+ struct raw_view {
+ const char* data;
+ size_t size;
+ operator absl::string_view() const { // NOLINT(runtime/explicit)
+ return {data, size};
+ }
+ };
+ std::vector<absl::string_view, A> v;
+ std::array<raw_view, 16> ar;
+ for (auto it = splitter.begin(); !it.at_end();) {
+ size_t index = 0;
+ do {
+ ar[index].data = it->data();
+ ar[index].size = it->size();
+ ++it;
+ } while (++index != ar.size() && !it.at_end());
+ v.insert(v.end(), ar.begin(), ar.begin() + index);
+ }
+ return v;
+ }
+ };
+
+ // Partial specialization for a std::vector<std::string>.
+ //
+ // Optimized for the common case of splitting to a std::vector<std::string>.
+ // In this case we first split the results to a std::vector<absl::string_view>
+ // so the returned std::vector<std::string> can have space reserved to avoid
+ // std::string moves.
+ template <typename A>
+ struct ConvertToContainer<std::vector<std::string, A>, std::string, false> {
+ std::vector<std::string, A> operator()(const Splitter& splitter) const {
+ const std::vector<absl::string_view> v = splitter;
+ return std::vector<std::string, A>(v.begin(), v.end());
+ }
+ };
+
+ // Partial specialization for containers of pairs (e.g., maps).
+ //
+ // The algorithm is to insert a new pair into the map for each even-numbered
+ // item, with the even-numbered item as the key with a default-constructed
+ // value. Each odd-numbered item will then be assigned to the last pair's
+ // value.
+ template <typename Container, typename First, typename Second>
+ struct ConvertToContainer<Container, std::pair<const First, Second>, true> {
+ Container operator()(const Splitter& splitter) const {
+ Container m;
+ typename Container::iterator it;
+ bool insert = true;
+ for (const auto& sp : splitter) {
+ if (insert) {
+ it = Inserter<Container>::Insert(&m, First(sp), Second());
+ } else {
+ it->second = Second(sp);
+ }
+ insert = !insert;
+ }
+ return m;
+ }
+
+ // Inserts the key and value into the given map, returning an iterator to
+ // the inserted item. Specialized for std::map and std::multimap to use
+ // emplace() and adapt emplace()'s return value.
+ template <typename Map>
+ struct Inserter {
+ using M = Map;
+ template <typename... Args>
+ static typename M::iterator Insert(M* m, Args&&... args) {
+ return m->insert(std::make_pair(std::forward<Args>(args)...)).first;
+ }
+ };
+
+ template <typename... Ts>
+ struct Inserter<std::map<Ts...>> {
+ using M = std::map<Ts...>;
+ template <typename... Args>
+ static typename M::iterator Insert(M* m, Args&&... args) {
+ return m->emplace(std::make_pair(std::forward<Args>(args)...)).first;
+ }
+ };
+
+ template <typename... Ts>
+ struct Inserter<std::multimap<Ts...>> {
+ using M = std::multimap<Ts...>;
+ template <typename... Args>
+ static typename M::iterator Insert(M* m, Args&&... args) {
+ return m->emplace(std::make_pair(std::forward<Args>(args)...));
+ }
+ };
+ };
+
+ StringType text_;
+ Delimiter delimiter_;
+ Predicate predicate_;
+};
+
+} // namespace strings_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_STRINGS_INTERNAL_STR_SPLIT_INTERNAL_H_
diff --git a/third_party/abseil/src/absl/strings/internal/string_constant.h b/third_party/abseil/src/absl/strings/internal/string_constant.h
new file mode 100644
index 0000000..b15f1d9
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/internal/string_constant.h
@@ -0,0 +1,70 @@
+// Copyright 2020 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_STRINGS_INTERNAL_STRING_CONSTANT_H_
+#define ABSL_STRINGS_INTERNAL_STRING_CONSTANT_H_
+
+#include "absl/meta/type_traits.h"
+#include "absl/strings/string_view.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace strings_internal {
+
+// StringConstant<T> represents a compile time string constant.
+// It can be accessed via its `absl::string_view value` static member.
+// It is guaranteed that the `string_view` returned has constant `.data()`,
+// constant `.size()` and constant `value[i]` for all `0 <= i < .size()`
+//
+// The `T` is an opaque type. It is guaranteed that different string constants
+// will have different values of `T`. This allows users to associate the string
+// constant with other static state at compile time.
+//
+// Instances should be made using the `MakeStringConstant()` factory function
+// below.
+template <typename T>
+struct StringConstant {
+ private:
+ // Returns true if `view` points to constant data.
+ // Otherwise, it can't be constant evaluated.
+ static constexpr bool ValidateConstant(absl::string_view view) {
+ return view.empty() || 2 * view[0] != 1;
+ }
+
+ public:
+ static constexpr absl::string_view value = T{}();
+ constexpr absl::string_view operator()() const { return value; }
+
+ static_assert(ValidateConstant(value),
+ "The input string_view must point to constant data.");
+};
+
+template <typename T>
+constexpr absl::string_view StringConstant<T>::value; // NOLINT
+
+// Factory function for `StringConstant` instances.
+// It supports callables that have a constexpr default constructor and a
+// constexpr operator().
+// It must return an `absl::string_view` or `const char*` pointing to constant
+// data. This is validated at compile time.
+template <typename T>
+constexpr StringConstant<T> MakeStringConstant(T) {
+ return {};
+}
+
+} // namespace strings_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_STRINGS_INTERNAL_STRING_CONSTANT_H_
diff --git a/third_party/abseil/src/absl/strings/internal/string_constant_test.cc b/third_party/abseil/src/absl/strings/internal/string_constant_test.cc
new file mode 100644
index 0000000..392833c
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/internal/string_constant_test.cc
@@ -0,0 +1,60 @@
+// Copyright 2020 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/strings/internal/string_constant.h"
+
+#include "absl/meta/type_traits.h"
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+
+namespace {
+
+using absl::strings_internal::MakeStringConstant;
+
+struct Callable {
+ constexpr absl::string_view operator()() const {
+ return absl::string_view("Callable", 8);
+ }
+};
+
+TEST(StringConstant, Traits) {
+ constexpr auto str = MakeStringConstant(Callable{});
+ using T = decltype(str);
+
+ EXPECT_TRUE(std::is_empty<T>::value);
+ EXPECT_TRUE(std::is_trivial<T>::value);
+ EXPECT_TRUE(absl::is_trivially_default_constructible<T>::value);
+ EXPECT_TRUE(absl::is_trivially_copy_constructible<T>::value);
+ EXPECT_TRUE(absl::is_trivially_move_constructible<T>::value);
+ EXPECT_TRUE(absl::is_trivially_destructible<T>::value);
+}
+
+TEST(StringConstant, MakeFromCallable) {
+ constexpr auto str = MakeStringConstant(Callable{});
+ using T = decltype(str);
+ EXPECT_EQ(Callable{}(), T::value);
+ EXPECT_EQ(Callable{}(), str());
+}
+
+TEST(StringConstant, MakeFromStringConstant) {
+ // We want to make sure the StringConstant itself is a valid input to the
+ // factory function.
+ constexpr auto str = MakeStringConstant(Callable{});
+ constexpr auto str2 = MakeStringConstant(str);
+ using T = decltype(str2);
+ EXPECT_EQ(Callable{}(), T::value);
+ EXPECT_EQ(Callable{}(), str2());
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/strings/internal/utf8.cc b/third_party/abseil/src/absl/strings/internal/utf8.cc
new file mode 100644
index 0000000..8fd8edc
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/internal/utf8.cc
@@ -0,0 +1,53 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// UTF8 utilities, implemented to reduce dependencies.
+
+#include "absl/strings/internal/utf8.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace strings_internal {
+
+size_t EncodeUTF8Char(char *buffer, char32_t utf8_char) {
+ if (utf8_char <= 0x7F) {
+ *buffer = static_cast<char>(utf8_char);
+ return 1;
+ } else if (utf8_char <= 0x7FF) {
+ buffer[1] = 0x80 | (utf8_char & 0x3F);
+ utf8_char >>= 6;
+ buffer[0] = 0xC0 | utf8_char;
+ return 2;
+ } else if (utf8_char <= 0xFFFF) {
+ buffer[2] = 0x80 | (utf8_char & 0x3F);
+ utf8_char >>= 6;
+ buffer[1] = 0x80 | (utf8_char & 0x3F);
+ utf8_char >>= 6;
+ buffer[0] = 0xE0 | utf8_char;
+ return 3;
+ } else {
+ buffer[3] = 0x80 | (utf8_char & 0x3F);
+ utf8_char >>= 6;
+ buffer[2] = 0x80 | (utf8_char & 0x3F);
+ utf8_char >>= 6;
+ buffer[1] = 0x80 | (utf8_char & 0x3F);
+ utf8_char >>= 6;
+ buffer[0] = 0xF0 | utf8_char;
+ return 4;
+ }
+}
+
+} // namespace strings_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/strings/internal/utf8.h b/third_party/abseil/src/absl/strings/internal/utf8.h
new file mode 100644
index 0000000..32fb109
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/internal/utf8.h
@@ -0,0 +1,50 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// UTF8 utilities, implemented to reduce dependencies.
+
+#ifndef ABSL_STRINGS_INTERNAL_UTF8_H_
+#define ABSL_STRINGS_INTERNAL_UTF8_H_
+
+#include <cstddef>
+#include <cstdint>
+
+#include "absl/base/config.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace strings_internal {
+
+// For Unicode code points 0 through 0x10FFFF, EncodeUTF8Char writes
+// out the UTF-8 encoding into buffer, and returns the number of chars
+// it wrote.
+//
+// As described in https://tools.ietf.org/html/rfc3629#section-3 , the encodings
+// are:
+// 00 - 7F : 0xxxxxxx
+// 80 - 7FF : 110xxxxx 10xxxxxx
+// 800 - FFFF : 1110xxxx 10xxxxxx 10xxxxxx
+// 10000 - 10FFFF : 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
+//
+// Values greater than 0x10FFFF are not supported and may or may not write
+// characters into buffer, however never will more than kMaxEncodedUTF8Size
+// bytes be written, regardless of the value of utf8_char.
+enum { kMaxEncodedUTF8Size = 4 };
+size_t EncodeUTF8Char(char *buffer, char32_t utf8_char);
+
+} // namespace strings_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_STRINGS_INTERNAL_UTF8_H_
diff --git a/third_party/abseil/src/absl/strings/internal/utf8_test.cc b/third_party/abseil/src/absl/strings/internal/utf8_test.cc
new file mode 100644
index 0000000..88dd503
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/internal/utf8_test.cc
@@ -0,0 +1,66 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/strings/internal/utf8.h"
+
+#include <cstdint>
+#include <utility>
+
+#include "gtest/gtest.h"
+#include "absl/base/port.h"
+
+namespace {
+
+#if !defined(__cpp_char8_t)
+#if defined(__clang__)
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wc++2a-compat"
+#endif
+TEST(EncodeUTF8Char, BasicFunction) {
+ std::pair<char32_t, std::string> tests[] = {{0x0030, u8"\u0030"},
+ {0x00A3, u8"\u00A3"},
+ {0x00010000, u8"\U00010000"},
+ {0x0000FFFF, u8"\U0000FFFF"},
+ {0x0010FFFD, u8"\U0010FFFD"}};
+ for (auto &test : tests) {
+ char buf0[7] = {'\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00'};
+ char buf1[7] = {'\xFF', '\xFF', '\xFF', '\xFF', '\xFF', '\xFF', '\xFF'};
+ char *buf0_written =
+ &buf0[absl::strings_internal::EncodeUTF8Char(buf0, test.first)];
+ char *buf1_written =
+ &buf1[absl::strings_internal::EncodeUTF8Char(buf1, test.first)];
+ int apparent_length = 7;
+ while (buf0[apparent_length - 1] == '\x00' &&
+ buf1[apparent_length - 1] == '\xFF') {
+ if (--apparent_length == 0) break;
+ }
+ EXPECT_EQ(apparent_length, buf0_written - buf0);
+ EXPECT_EQ(apparent_length, buf1_written - buf1);
+ EXPECT_EQ(apparent_length, test.second.length());
+ EXPECT_EQ(std::string(buf0, apparent_length), test.second);
+ EXPECT_EQ(std::string(buf1, apparent_length), test.second);
+ }
+ char buf[32] = "Don't Tread On Me";
+ EXPECT_LE(absl::strings_internal::EncodeUTF8Char(buf, 0x00110000),
+ absl::strings_internal::kMaxEncodedUTF8Size);
+ char buf2[32] = "Negative is invalid but sane";
+ EXPECT_LE(absl::strings_internal::EncodeUTF8Char(buf2, -1),
+ absl::strings_internal::kMaxEncodedUTF8Size);
+}
+#if defined(__clang__)
+#pragma clang diagnostic pop
+#endif
+#endif // !defined(__cpp_char8_t)
+
+} // namespace
diff --git a/third_party/abseil/src/absl/strings/match.cc b/third_party/abseil/src/absl/strings/match.cc
new file mode 100644
index 0000000..8127cb0
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/match.cc
@@ -0,0 +1,40 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/strings/match.h"
+
+#include "absl/strings/internal/memutil.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+bool EqualsIgnoreCase(absl::string_view piece1, absl::string_view piece2) {
+ return (piece1.size() == piece2.size() &&
+ 0 == absl::strings_internal::memcasecmp(piece1.data(), piece2.data(),
+ piece1.size()));
+ // memcasecmp uses absl::ascii_tolower().
+}
+
+bool StartsWithIgnoreCase(absl::string_view text, absl::string_view prefix) {
+ return (text.size() >= prefix.size()) &&
+ EqualsIgnoreCase(text.substr(0, prefix.size()), prefix);
+}
+
+bool EndsWithIgnoreCase(absl::string_view text, absl::string_view suffix) {
+ return (text.size() >= suffix.size()) &&
+ EqualsIgnoreCase(text.substr(text.size() - suffix.size()), suffix);
+}
+
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/strings/match.h b/third_party/abseil/src/absl/strings/match.h
new file mode 100644
index 0000000..90fca98
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/match.h
@@ -0,0 +1,90 @@
+//
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: match.h
+// -----------------------------------------------------------------------------
+//
+// This file contains simple utilities for performing string matching checks.
+// All of these function parameters are specified as `absl::string_view`,
+// meaning that these functions can accept `std::string`, `absl::string_view` or
+// NUL-terminated C-style strings.
+//
+// Examples:
+// std::string s = "foo";
+// absl::string_view sv = "f";
+// assert(absl::StrContains(s, sv));
+//
+// Note: The order of parameters in these functions is designed to mimic the
+// order an equivalent member function would exhibit;
+// e.g. `s.Contains(x)` ==> `absl::StrContains(s, x).
+#ifndef ABSL_STRINGS_MATCH_H_
+#define ABSL_STRINGS_MATCH_H_
+
+#include <cstring>
+
+#include "absl/strings/string_view.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+// StrContains()
+//
+// Returns whether a given string `haystack` contains the substring `needle`.
+inline bool StrContains(absl::string_view haystack, absl::string_view needle) {
+ return haystack.find(needle, 0) != haystack.npos;
+}
+
+// StartsWith()
+//
+// Returns whether a given string `text` begins with `prefix`.
+inline bool StartsWith(absl::string_view text, absl::string_view prefix) {
+ return prefix.empty() ||
+ (text.size() >= prefix.size() &&
+ memcmp(text.data(), prefix.data(), prefix.size()) == 0);
+}
+
+// EndsWith()
+//
+// Returns whether a given string `text` ends with `suffix`.
+inline bool EndsWith(absl::string_view text, absl::string_view suffix) {
+ return suffix.empty() ||
+ (text.size() >= suffix.size() &&
+ memcmp(text.data() + (text.size() - suffix.size()), suffix.data(),
+ suffix.size()) == 0);
+}
+
+// EqualsIgnoreCase()
+//
+// Returns whether given ASCII strings `piece1` and `piece2` are equal, ignoring
+// case in the comparison.
+bool EqualsIgnoreCase(absl::string_view piece1, absl::string_view piece2);
+
+// StartsWithIgnoreCase()
+//
+// Returns whether a given ASCII string `text` starts with `prefix`,
+// ignoring case in the comparison.
+bool StartsWithIgnoreCase(absl::string_view text, absl::string_view prefix);
+
+// EndsWithIgnoreCase()
+//
+// Returns whether a given ASCII string `text` ends with `suffix`, ignoring
+// case in the comparison.
+bool EndsWithIgnoreCase(absl::string_view text, absl::string_view suffix);
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_STRINGS_MATCH_H_
diff --git a/third_party/abseil/src/absl/strings/match_test.cc b/third_party/abseil/src/absl/strings/match_test.cc
new file mode 100644
index 0000000..4c313dd
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/match_test.cc
@@ -0,0 +1,110 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/strings/match.h"
+
+#include "gtest/gtest.h"
+
+namespace {
+
+TEST(MatchTest, StartsWith) {
+ const std::string s1("123\0abc", 7);
+ const absl::string_view a("foobar");
+ const absl::string_view b(s1);
+ const absl::string_view e;
+ EXPECT_TRUE(absl::StartsWith(a, a));
+ EXPECT_TRUE(absl::StartsWith(a, "foo"));
+ EXPECT_TRUE(absl::StartsWith(a, e));
+ EXPECT_TRUE(absl::StartsWith(b, s1));
+ EXPECT_TRUE(absl::StartsWith(b, b));
+ EXPECT_TRUE(absl::StartsWith(b, e));
+ EXPECT_TRUE(absl::StartsWith(e, ""));
+ EXPECT_FALSE(absl::StartsWith(a, b));
+ EXPECT_FALSE(absl::StartsWith(b, a));
+ EXPECT_FALSE(absl::StartsWith(e, a));
+}
+
+TEST(MatchTest, EndsWith) {
+ const std::string s1("123\0abc", 7);
+ const absl::string_view a("foobar");
+ const absl::string_view b(s1);
+ const absl::string_view e;
+ EXPECT_TRUE(absl::EndsWith(a, a));
+ EXPECT_TRUE(absl::EndsWith(a, "bar"));
+ EXPECT_TRUE(absl::EndsWith(a, e));
+ EXPECT_TRUE(absl::EndsWith(b, s1));
+ EXPECT_TRUE(absl::EndsWith(b, b));
+ EXPECT_TRUE(absl::EndsWith(b, e));
+ EXPECT_TRUE(absl::EndsWith(e, ""));
+ EXPECT_FALSE(absl::EndsWith(a, b));
+ EXPECT_FALSE(absl::EndsWith(b, a));
+ EXPECT_FALSE(absl::EndsWith(e, a));
+}
+
+TEST(MatchTest, Contains) {
+ absl::string_view a("abcdefg");
+ absl::string_view b("abcd");
+ absl::string_view c("efg");
+ absl::string_view d("gh");
+ EXPECT_TRUE(absl::StrContains(a, a));
+ EXPECT_TRUE(absl::StrContains(a, b));
+ EXPECT_TRUE(absl::StrContains(a, c));
+ EXPECT_FALSE(absl::StrContains(a, d));
+ EXPECT_TRUE(absl::StrContains("", ""));
+ EXPECT_TRUE(absl::StrContains("abc", ""));
+ EXPECT_FALSE(absl::StrContains("", "a"));
+}
+
+TEST(MatchTest, ContainsNull) {
+ const std::string s = "foo";
+ const char* cs = "foo";
+ const absl::string_view sv("foo");
+ const absl::string_view sv2("foo\0bar", 4);
+ EXPECT_EQ(s, "foo");
+ EXPECT_EQ(sv, "foo");
+ EXPECT_NE(sv2, "foo");
+ EXPECT_TRUE(absl::EndsWith(s, sv));
+ EXPECT_TRUE(absl::StartsWith(cs, sv));
+ EXPECT_TRUE(absl::StrContains(cs, sv));
+ EXPECT_FALSE(absl::StrContains(cs, sv2));
+}
+
+TEST(MatchTest, EqualsIgnoreCase) {
+ std::string text = "the";
+ absl::string_view data(text);
+
+ EXPECT_TRUE(absl::EqualsIgnoreCase(data, "The"));
+ EXPECT_TRUE(absl::EqualsIgnoreCase(data, "THE"));
+ EXPECT_TRUE(absl::EqualsIgnoreCase(data, "the"));
+ EXPECT_FALSE(absl::EqualsIgnoreCase(data, "Quick"));
+ EXPECT_FALSE(absl::EqualsIgnoreCase(data, "then"));
+}
+
+TEST(MatchTest, StartsWithIgnoreCase) {
+ EXPECT_TRUE(absl::StartsWithIgnoreCase("foo", "foo"));
+ EXPECT_TRUE(absl::StartsWithIgnoreCase("foo", "Fo"));
+ EXPECT_TRUE(absl::StartsWithIgnoreCase("foo", ""));
+ EXPECT_FALSE(absl::StartsWithIgnoreCase("foo", "fooo"));
+ EXPECT_FALSE(absl::StartsWithIgnoreCase("", "fo"));
+}
+
+TEST(MatchTest, EndsWithIgnoreCase) {
+ EXPECT_TRUE(absl::EndsWithIgnoreCase("foo", "foo"));
+ EXPECT_TRUE(absl::EndsWithIgnoreCase("foo", "Oo"));
+ EXPECT_TRUE(absl::EndsWithIgnoreCase("foo", ""));
+ EXPECT_FALSE(absl::EndsWithIgnoreCase("foo", "fooo"));
+ EXPECT_FALSE(absl::EndsWithIgnoreCase("", "fo"));
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/strings/numbers.cc b/third_party/abseil/src/absl/strings/numbers.cc
new file mode 100644
index 0000000..3da1059
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/numbers.cc
@@ -0,0 +1,1083 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// This file contains string processing functions related to
+// numeric values.
+
+#include "absl/strings/numbers.h"
+
+#include <algorithm>
+#include <cassert>
+#include <cfloat> // for DBL_DIG and FLT_DIG
+#include <cmath> // for HUGE_VAL
+#include <cstdint>
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+#include <iterator>
+#include <limits>
+#include <memory>
+#include <utility>
+
+#include "absl/base/attributes.h"
+#include "absl/base/internal/bits.h"
+#include "absl/base/internal/raw_logging.h"
+#include "absl/strings/ascii.h"
+#include "absl/strings/charconv.h"
+#include "absl/strings/escaping.h"
+#include "absl/strings/internal/memutil.h"
+#include "absl/strings/match.h"
+#include "absl/strings/str_cat.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+bool SimpleAtof(absl::string_view str, float* out) {
+ *out = 0.0;
+ str = StripAsciiWhitespace(str);
+ if (!str.empty() && str[0] == '+') {
+ str.remove_prefix(1);
+ }
+ auto result = absl::from_chars(str.data(), str.data() + str.size(), *out);
+ if (result.ec == std::errc::invalid_argument) {
+ return false;
+ }
+ if (result.ptr != str.data() + str.size()) {
+ // not all non-whitespace characters consumed
+ return false;
+ }
+ // from_chars() with DR 3081's current wording will return max() on
+ // overflow. SimpleAtof returns infinity instead.
+ if (result.ec == std::errc::result_out_of_range) {
+ if (*out > 1.0) {
+ *out = std::numeric_limits<float>::infinity();
+ } else if (*out < -1.0) {
+ *out = -std::numeric_limits<float>::infinity();
+ }
+ }
+ return true;
+}
+
+bool SimpleAtod(absl::string_view str, double* out) {
+ *out = 0.0;
+ str = StripAsciiWhitespace(str);
+ if (!str.empty() && str[0] == '+') {
+ str.remove_prefix(1);
+ }
+ auto result = absl::from_chars(str.data(), str.data() + str.size(), *out);
+ if (result.ec == std::errc::invalid_argument) {
+ return false;
+ }
+ if (result.ptr != str.data() + str.size()) {
+ // not all non-whitespace characters consumed
+ return false;
+ }
+ // from_chars() with DR 3081's current wording will return max() on
+ // overflow. SimpleAtod returns infinity instead.
+ if (result.ec == std::errc::result_out_of_range) {
+ if (*out > 1.0) {
+ *out = std::numeric_limits<double>::infinity();
+ } else if (*out < -1.0) {
+ *out = -std::numeric_limits<double>::infinity();
+ }
+ }
+ return true;
+}
+
+bool SimpleAtob(absl::string_view str, bool* out) {
+ ABSL_RAW_CHECK(out != nullptr, "Output pointer must not be nullptr.");
+ if (EqualsIgnoreCase(str, "true") || EqualsIgnoreCase(str, "t") ||
+ EqualsIgnoreCase(str, "yes") || EqualsIgnoreCase(str, "y") ||
+ EqualsIgnoreCase(str, "1")) {
+ *out = true;
+ return true;
+ }
+ if (EqualsIgnoreCase(str, "false") || EqualsIgnoreCase(str, "f") ||
+ EqualsIgnoreCase(str, "no") || EqualsIgnoreCase(str, "n") ||
+ EqualsIgnoreCase(str, "0")) {
+ *out = false;
+ return true;
+ }
+ return false;
+}
+
+// ----------------------------------------------------------------------
+// FastIntToBuffer() overloads
+//
+// Like the Fast*ToBuffer() functions above, these are intended for speed.
+// Unlike the Fast*ToBuffer() functions, however, these functions write
+// their output to the beginning of the buffer. The caller is responsible
+// for ensuring that the buffer has enough space to hold the output.
+//
+// Returns a pointer to the end of the string (i.e. the null character
+// terminating the string).
+// ----------------------------------------------------------------------
+
+namespace {
+
+// Used to optimize printing a decimal number's final digit.
+const char one_ASCII_final_digits[10][2] {
+ {'0', 0}, {'1', 0}, {'2', 0}, {'3', 0}, {'4', 0},
+ {'5', 0}, {'6', 0}, {'7', 0}, {'8', 0}, {'9', 0},
+};
+
+} // namespace
+
+char* numbers_internal::FastIntToBuffer(uint32_t i, char* buffer) {
+ uint32_t digits;
+ // The idea of this implementation is to trim the number of divides to as few
+ // as possible, and also reducing memory stores and branches, by going in
+ // steps of two digits at a time rather than one whenever possible.
+ // The huge-number case is first, in the hopes that the compiler will output
+ // that case in one branch-free block of code, and only output conditional
+ // branches into it from below.
+ if (i >= 1000000000) { // >= 1,000,000,000
+ digits = i / 100000000; // 100,000,000
+ i -= digits * 100000000;
+ PutTwoDigits(digits, buffer);
+ buffer += 2;
+ lt100_000_000:
+ digits = i / 1000000; // 1,000,000
+ i -= digits * 1000000;
+ PutTwoDigits(digits, buffer);
+ buffer += 2;
+ lt1_000_000:
+ digits = i / 10000; // 10,000
+ i -= digits * 10000;
+ PutTwoDigits(digits, buffer);
+ buffer += 2;
+ lt10_000:
+ digits = i / 100;
+ i -= digits * 100;
+ PutTwoDigits(digits, buffer);
+ buffer += 2;
+ lt100:
+ digits = i;
+ PutTwoDigits(digits, buffer);
+ buffer += 2;
+ *buffer = 0;
+ return buffer;
+ }
+
+ if (i < 100) {
+ digits = i;
+ if (i >= 10) goto lt100;
+ memcpy(buffer, one_ASCII_final_digits[i], 2);
+ return buffer + 1;
+ }
+ if (i < 10000) { // 10,000
+ if (i >= 1000) goto lt10_000;
+ digits = i / 100;
+ i -= digits * 100;
+ *buffer++ = '0' + digits;
+ goto lt100;
+ }
+ if (i < 1000000) { // 1,000,000
+ if (i >= 100000) goto lt1_000_000;
+ digits = i / 10000; // 10,000
+ i -= digits * 10000;
+ *buffer++ = '0' + digits;
+ goto lt10_000;
+ }
+ if (i < 100000000) { // 100,000,000
+ if (i >= 10000000) goto lt100_000_000;
+ digits = i / 1000000; // 1,000,000
+ i -= digits * 1000000;
+ *buffer++ = '0' + digits;
+ goto lt1_000_000;
+ }
+ // we already know that i < 1,000,000,000
+ digits = i / 100000000; // 100,000,000
+ i -= digits * 100000000;
+ *buffer++ = '0' + digits;
+ goto lt100_000_000;
+}
+
+char* numbers_internal::FastIntToBuffer(int32_t i, char* buffer) {
+ uint32_t u = i;
+ if (i < 0) {
+ *buffer++ = '-';
+ // We need to do the negation in modular (i.e., "unsigned")
+ // arithmetic; MSVC++ apprently warns for plain "-u", so
+ // we write the equivalent expression "0 - u" instead.
+ u = 0 - u;
+ }
+ return numbers_internal::FastIntToBuffer(u, buffer);
+}
+
+char* numbers_internal::FastIntToBuffer(uint64_t i, char* buffer) {
+ uint32_t u32 = static_cast<uint32_t>(i);
+ if (u32 == i) return numbers_internal::FastIntToBuffer(u32, buffer);
+
+ // Here we know i has at least 10 decimal digits.
+ uint64_t top_1to11 = i / 1000000000;
+ u32 = static_cast<uint32_t>(i - top_1to11 * 1000000000);
+ uint32_t top_1to11_32 = static_cast<uint32_t>(top_1to11);
+
+ if (top_1to11_32 == top_1to11) {
+ buffer = numbers_internal::FastIntToBuffer(top_1to11_32, buffer);
+ } else {
+ // top_1to11 has more than 32 bits too; print it in two steps.
+ uint32_t top_8to9 = static_cast<uint32_t>(top_1to11 / 100);
+ uint32_t mid_2 = static_cast<uint32_t>(top_1to11 - top_8to9 * 100);
+ buffer = numbers_internal::FastIntToBuffer(top_8to9, buffer);
+ PutTwoDigits(mid_2, buffer);
+ buffer += 2;
+ }
+
+ // We have only 9 digits now, again the maximum uint32_t can handle fully.
+ uint32_t digits = u32 / 10000000; // 10,000,000
+ u32 -= digits * 10000000;
+ PutTwoDigits(digits, buffer);
+ buffer += 2;
+ digits = u32 / 100000; // 100,000
+ u32 -= digits * 100000;
+ PutTwoDigits(digits, buffer);
+ buffer += 2;
+ digits = u32 / 1000; // 1,000
+ u32 -= digits * 1000;
+ PutTwoDigits(digits, buffer);
+ buffer += 2;
+ digits = u32 / 10;
+ u32 -= digits * 10;
+ PutTwoDigits(digits, buffer);
+ buffer += 2;
+ memcpy(buffer, one_ASCII_final_digits[u32], 2);
+ return buffer + 1;
+}
+
+char* numbers_internal::FastIntToBuffer(int64_t i, char* buffer) {
+ uint64_t u = i;
+ if (i < 0) {
+ *buffer++ = '-';
+ u = 0 - u;
+ }
+ return numbers_internal::FastIntToBuffer(u, buffer);
+}
+
+// Given a 128-bit number expressed as a pair of uint64_t, high half first,
+// return that number multiplied by the given 32-bit value. If the result is
+// too large to fit in a 128-bit number, divide it by 2 until it fits.
+static std::pair<uint64_t, uint64_t> Mul32(std::pair<uint64_t, uint64_t> num,
+ uint32_t mul) {
+ uint64_t bits0_31 = num.second & 0xFFFFFFFF;
+ uint64_t bits32_63 = num.second >> 32;
+ uint64_t bits64_95 = num.first & 0xFFFFFFFF;
+ uint64_t bits96_127 = num.first >> 32;
+
+ // The picture so far: each of these 64-bit values has only the lower 32 bits
+ // filled in.
+ // bits96_127: [ 00000000 xxxxxxxx ]
+ // bits64_95: [ 00000000 xxxxxxxx ]
+ // bits32_63: [ 00000000 xxxxxxxx ]
+ // bits0_31: [ 00000000 xxxxxxxx ]
+
+ bits0_31 *= mul;
+ bits32_63 *= mul;
+ bits64_95 *= mul;
+ bits96_127 *= mul;
+
+ // Now the top halves may also have value, though all 64 of their bits will
+ // never be set at the same time, since they are a result of a 32x32 bit
+ // multiply. This makes the carry calculation slightly easier.
+ // bits96_127: [ mmmmmmmm | mmmmmmmm ]
+ // bits64_95: [ | mmmmmmmm mmmmmmmm | ]
+ // bits32_63: | [ mmmmmmmm | mmmmmmmm ]
+ // bits0_31: | [ | mmmmmmmm mmmmmmmm ]
+ // eventually: [ bits128_up | ...bits64_127.... | ..bits0_63... ]
+
+ uint64_t bits0_63 = bits0_31 + (bits32_63 << 32);
+ uint64_t bits64_127 = bits64_95 + (bits96_127 << 32) + (bits32_63 >> 32) +
+ (bits0_63 < bits0_31);
+ uint64_t bits128_up = (bits96_127 >> 32) + (bits64_127 < bits64_95);
+ if (bits128_up == 0) return {bits64_127, bits0_63};
+
+ int shift = 64 - base_internal::CountLeadingZeros64(bits128_up);
+ uint64_t lo = (bits0_63 >> shift) + (bits64_127 << (64 - shift));
+ uint64_t hi = (bits64_127 >> shift) + (bits128_up << (64 - shift));
+ return {hi, lo};
+}
+
+// Compute num * 5 ^ expfive, and return the first 128 bits of the result,
+// where the first bit is always a one. So PowFive(1, 0) starts 0b100000,
+// PowFive(1, 1) starts 0b101000, PowFive(1, 2) starts 0b110010, etc.
+static std::pair<uint64_t, uint64_t> PowFive(uint64_t num, int expfive) {
+ std::pair<uint64_t, uint64_t> result = {num, 0};
+ while (expfive >= 13) {
+ // 5^13 is the highest power of five that will fit in a 32-bit integer.
+ result = Mul32(result, 5 * 5 * 5 * 5 * 5 * 5 * 5 * 5 * 5 * 5 * 5 * 5 * 5);
+ expfive -= 13;
+ }
+ constexpr int powers_of_five[13] = {
+ 1,
+ 5,
+ 5 * 5,
+ 5 * 5 * 5,
+ 5 * 5 * 5 * 5,
+ 5 * 5 * 5 * 5 * 5,
+ 5 * 5 * 5 * 5 * 5 * 5,
+ 5 * 5 * 5 * 5 * 5 * 5 * 5,
+ 5 * 5 * 5 * 5 * 5 * 5 * 5 * 5,
+ 5 * 5 * 5 * 5 * 5 * 5 * 5 * 5 * 5,
+ 5 * 5 * 5 * 5 * 5 * 5 * 5 * 5 * 5 * 5,
+ 5 * 5 * 5 * 5 * 5 * 5 * 5 * 5 * 5 * 5 * 5,
+ 5 * 5 * 5 * 5 * 5 * 5 * 5 * 5 * 5 * 5 * 5 * 5};
+ result = Mul32(result, powers_of_five[expfive & 15]);
+ int shift = base_internal::CountLeadingZeros64(result.first);
+ if (shift != 0) {
+ result.first = (result.first << shift) + (result.second >> (64 - shift));
+ result.second = (result.second << shift);
+ }
+ return result;
+}
+
+struct ExpDigits {
+ int32_t exponent;
+ char digits[6];
+};
+
+// SplitToSix converts value, a positive double-precision floating-point number,
+// into a base-10 exponent and 6 ASCII digits, where the first digit is never
+// zero. For example, SplitToSix(1) returns an exponent of zero and a digits
+// array of {'1', '0', '0', '0', '0', '0'}. If value is exactly halfway between
+// two possible representations, e.g. value = 100000.5, then "round to even" is
+// performed.
+static ExpDigits SplitToSix(const double value) {
+ ExpDigits exp_dig;
+ int exp = 5;
+ double d = value;
+ // First step: calculate a close approximation of the output, where the
+ // value d will be between 100,000 and 999,999, representing the digits
+ // in the output ASCII array, and exp is the base-10 exponent. It would be
+ // faster to use a table here, and to look up the base-2 exponent of value,
+ // however value is an IEEE-754 64-bit number, so the table would have 2,000
+ // entries, which is not cache-friendly.
+ if (d >= 999999.5) {
+ if (d >= 1e+261) exp += 256, d *= 1e-256;
+ if (d >= 1e+133) exp += 128, d *= 1e-128;
+ if (d >= 1e+69) exp += 64, d *= 1e-64;
+ if (d >= 1e+37) exp += 32, d *= 1e-32;
+ if (d >= 1e+21) exp += 16, d *= 1e-16;
+ if (d >= 1e+13) exp += 8, d *= 1e-8;
+ if (d >= 1e+9) exp += 4, d *= 1e-4;
+ if (d >= 1e+7) exp += 2, d *= 1e-2;
+ if (d >= 1e+6) exp += 1, d *= 1e-1;
+ } else {
+ if (d < 1e-250) exp -= 256, d *= 1e256;
+ if (d < 1e-122) exp -= 128, d *= 1e128;
+ if (d < 1e-58) exp -= 64, d *= 1e64;
+ if (d < 1e-26) exp -= 32, d *= 1e32;
+ if (d < 1e-10) exp -= 16, d *= 1e16;
+ if (d < 1e-2) exp -= 8, d *= 1e8;
+ if (d < 1e+2) exp -= 4, d *= 1e4;
+ if (d < 1e+4) exp -= 2, d *= 1e2;
+ if (d < 1e+5) exp -= 1, d *= 1e1;
+ }
+ // At this point, d is in the range [99999.5..999999.5) and exp is in the
+ // range [-324..308]. Since we need to round d up, we want to add a half
+ // and truncate.
+ // However, the technique above may have lost some precision, due to its
+ // repeated multiplication by constants that each may be off by half a bit
+ // of precision. This only matters if we're close to the edge though.
+ // Since we'd like to know if the fractional part of d is close to a half,
+ // we multiply it by 65536 and see if the fractional part is close to 32768.
+ // (The number doesn't have to be a power of two,but powers of two are faster)
+ uint64_t d64k = d * 65536;
+ int dddddd; // A 6-digit decimal integer.
+ if ((d64k % 65536) == 32767 || (d64k % 65536) == 32768) {
+ // OK, it's fairly likely that precision was lost above, which is
+ // not a surprise given only 52 mantissa bits are available. Therefore
+ // redo the calculation using 128-bit numbers. (64 bits are not enough).
+
+ // Start out with digits rounded down; maybe add one below.
+ dddddd = static_cast<int>(d64k / 65536);
+
+ // mantissa is a 64-bit integer representing M.mmm... * 2^63. The actual
+ // value we're representing, of course, is M.mmm... * 2^exp2.
+ int exp2;
+ double m = std::frexp(value, &exp2);
+ uint64_t mantissa = m * (32768.0 * 65536.0 * 65536.0 * 65536.0);
+ // std::frexp returns an m value in the range [0.5, 1.0), however we
+ // can't multiply it by 2^64 and convert to an integer because some FPUs
+ // throw an exception when converting an number higher than 2^63 into an
+ // integer - even an unsigned 64-bit integer! Fortunately it doesn't matter
+ // since m only has 52 significant bits anyway.
+ mantissa <<= 1;
+ exp2 -= 64; // not needed, but nice for debugging
+
+ // OK, we are here to compare:
+ // (dddddd + 0.5) * 10^(exp-5) vs. mantissa * 2^exp2
+ // so we can round up dddddd if appropriate. Those values span the full
+ // range of 600 orders of magnitude of IEE 64-bit floating-point.
+ // Fortunately, we already know they are very close, so we don't need to
+ // track the base-2 exponent of both sides. This greatly simplifies the
+ // the math since the 2^exp2 calculation is unnecessary and the power-of-10
+ // calculation can become a power-of-5 instead.
+
+ std::pair<uint64_t, uint64_t> edge, val;
+ if (exp >= 6) {
+ // Compare (dddddd + 0.5) * 5 ^ (exp - 5) to mantissa
+ // Since we're tossing powers of two, 2 * dddddd + 1 is the
+ // same as dddddd + 0.5
+ edge = PowFive(2 * dddddd + 1, exp - 5);
+
+ val.first = mantissa;
+ val.second = 0;
+ } else {
+ // We can't compare (dddddd + 0.5) * 5 ^ (exp - 5) to mantissa as we did
+ // above because (exp - 5) is negative. So we compare (dddddd + 0.5) to
+ // mantissa * 5 ^ (5 - exp)
+ edge = PowFive(2 * dddddd + 1, 0);
+
+ val = PowFive(mantissa, 5 - exp);
+ }
+ // printf("exp=%d %016lx %016lx vs %016lx %016lx\n", exp, val.first,
+ // val.second, edge.first, edge.second);
+ if (val > edge) {
+ dddddd++;
+ } else if (val == edge) {
+ dddddd += (dddddd & 1);
+ }
+ } else {
+ // Here, we are not close to the edge.
+ dddddd = static_cast<int>((d64k + 32768) / 65536);
+ }
+ if (dddddd == 1000000) {
+ dddddd = 100000;
+ exp += 1;
+ }
+ exp_dig.exponent = exp;
+
+ int two_digits = dddddd / 10000;
+ dddddd -= two_digits * 10000;
+ numbers_internal::PutTwoDigits(two_digits, &exp_dig.digits[0]);
+
+ two_digits = dddddd / 100;
+ dddddd -= two_digits * 100;
+ numbers_internal::PutTwoDigits(two_digits, &exp_dig.digits[2]);
+
+ numbers_internal::PutTwoDigits(dddddd, &exp_dig.digits[4]);
+ return exp_dig;
+}
+
+// Helper function for fast formatting of floating-point.
+// The result is the same as "%g", a.k.a. "%.6g".
+size_t numbers_internal::SixDigitsToBuffer(double d, char* const buffer) {
+ static_assert(std::numeric_limits<float>::is_iec559,
+ "IEEE-754/IEC-559 support only");
+
+ char* out = buffer; // we write data to out, incrementing as we go, but
+ // FloatToBuffer always returns the address of the buffer
+ // passed in.
+
+ if (std::isnan(d)) {
+ strcpy(out, "nan"); // NOLINT(runtime/printf)
+ return 3;
+ }
+ if (d == 0) { // +0 and -0 are handled here
+ if (std::signbit(d)) *out++ = '-';
+ *out++ = '0';
+ *out = 0;
+ return out - buffer;
+ }
+ if (d < 0) {
+ *out++ = '-';
+ d = -d;
+ }
+ if (std::isinf(d)) {
+ strcpy(out, "inf"); // NOLINT(runtime/printf)
+ return out + 3 - buffer;
+ }
+
+ auto exp_dig = SplitToSix(d);
+ int exp = exp_dig.exponent;
+ const char* digits = exp_dig.digits;
+ out[0] = '0';
+ out[1] = '.';
+ switch (exp) {
+ case 5:
+ memcpy(out, &digits[0], 6), out += 6;
+ *out = 0;
+ return out - buffer;
+ case 4:
+ memcpy(out, &digits[0], 5), out += 5;
+ if (digits[5] != '0') {
+ *out++ = '.';
+ *out++ = digits[5];
+ }
+ *out = 0;
+ return out - buffer;
+ case 3:
+ memcpy(out, &digits[0], 4), out += 4;
+ if ((digits[5] | digits[4]) != '0') {
+ *out++ = '.';
+ *out++ = digits[4];
+ if (digits[5] != '0') *out++ = digits[5];
+ }
+ *out = 0;
+ return out - buffer;
+ case 2:
+ memcpy(out, &digits[0], 3), out += 3;
+ *out++ = '.';
+ memcpy(out, &digits[3], 3);
+ out += 3;
+ while (out[-1] == '0') --out;
+ if (out[-1] == '.') --out;
+ *out = 0;
+ return out - buffer;
+ case 1:
+ memcpy(out, &digits[0], 2), out += 2;
+ *out++ = '.';
+ memcpy(out, &digits[2], 4);
+ out += 4;
+ while (out[-1] == '0') --out;
+ if (out[-1] == '.') --out;
+ *out = 0;
+ return out - buffer;
+ case 0:
+ memcpy(out, &digits[0], 1), out += 1;
+ *out++ = '.';
+ memcpy(out, &digits[1], 5);
+ out += 5;
+ while (out[-1] == '0') --out;
+ if (out[-1] == '.') --out;
+ *out = 0;
+ return out - buffer;
+ case -4:
+ out[2] = '0';
+ ++out;
+ ABSL_FALLTHROUGH_INTENDED;
+ case -3:
+ out[2] = '0';
+ ++out;
+ ABSL_FALLTHROUGH_INTENDED;
+ case -2:
+ out[2] = '0';
+ ++out;
+ ABSL_FALLTHROUGH_INTENDED;
+ case -1:
+ out += 2;
+ memcpy(out, &digits[0], 6);
+ out += 6;
+ while (out[-1] == '0') --out;
+ *out = 0;
+ return out - buffer;
+ }
+ assert(exp < -4 || exp >= 6);
+ out[0] = digits[0];
+ assert(out[1] == '.');
+ out += 2;
+ memcpy(out, &digits[1], 5), out += 5;
+ while (out[-1] == '0') --out;
+ if (out[-1] == '.') --out;
+ *out++ = 'e';
+ if (exp > 0) {
+ *out++ = '+';
+ } else {
+ *out++ = '-';
+ exp = -exp;
+ }
+ if (exp > 99) {
+ int dig1 = exp / 100;
+ exp -= dig1 * 100;
+ *out++ = '0' + dig1;
+ }
+ PutTwoDigits(exp, out);
+ out += 2;
+ *out = 0;
+ return out - buffer;
+}
+
+namespace {
+// Represents integer values of digits.
+// Uses 36 to indicate an invalid character since we support
+// bases up to 36.
+static const int8_t kAsciiToInt[256] = {
+ 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, // 16 36s.
+ 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36,
+ 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 0, 1, 2, 3, 4, 5,
+ 6, 7, 8, 9, 36, 36, 36, 36, 36, 36, 36, 10, 11, 12, 13, 14, 15, 16, 17,
+ 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36,
+ 36, 36, 36, 36, 36, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23,
+ 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 36, 36, 36, 36, 36, 36,
+ 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36,
+ 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36,
+ 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36,
+ 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36,
+ 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36,
+ 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36,
+ 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36};
+
+// Parse the sign and optional hex or oct prefix in text.
+inline bool safe_parse_sign_and_base(absl::string_view* text /*inout*/,
+ int* base_ptr /*inout*/,
+ bool* negative_ptr /*output*/) {
+ if (text->data() == nullptr) {
+ return false;
+ }
+
+ const char* start = text->data();
+ const char* end = start + text->size();
+ int base = *base_ptr;
+
+ // Consume whitespace.
+ while (start < end && absl::ascii_isspace(start[0])) {
+ ++start;
+ }
+ while (start < end && absl::ascii_isspace(end[-1])) {
+ --end;
+ }
+ if (start >= end) {
+ return false;
+ }
+
+ // Consume sign.
+ *negative_ptr = (start[0] == '-');
+ if (*negative_ptr || start[0] == '+') {
+ ++start;
+ if (start >= end) {
+ return false;
+ }
+ }
+
+ // Consume base-dependent prefix.
+ // base 0: "0x" -> base 16, "0" -> base 8, default -> base 10
+ // base 16: "0x" -> base 16
+ // Also validate the base.
+ if (base == 0) {
+ if (end - start >= 2 && start[0] == '0' &&
+ (start[1] == 'x' || start[1] == 'X')) {
+ base = 16;
+ start += 2;
+ if (start >= end) {
+ // "0x" with no digits after is invalid.
+ return false;
+ }
+ } else if (end - start >= 1 && start[0] == '0') {
+ base = 8;
+ start += 1;
+ } else {
+ base = 10;
+ }
+ } else if (base == 16) {
+ if (end - start >= 2 && start[0] == '0' &&
+ (start[1] == 'x' || start[1] == 'X')) {
+ start += 2;
+ if (start >= end) {
+ // "0x" with no digits after is invalid.
+ return false;
+ }
+ }
+ } else if (base >= 2 && base <= 36) {
+ // okay
+ } else {
+ return false;
+ }
+ *text = absl::string_view(start, end - start);
+ *base_ptr = base;
+ return true;
+}
+
+// Consume digits.
+//
+// The classic loop:
+//
+// for each digit
+// value = value * base + digit
+// value *= sign
+//
+// The classic loop needs overflow checking. It also fails on the most
+// negative integer, -2147483648 in 32-bit two's complement representation.
+//
+// My improved loop:
+//
+// if (!negative)
+// for each digit
+// value = value * base
+// value = value + digit
+// else
+// for each digit
+// value = value * base
+// value = value - digit
+//
+// Overflow checking becomes simple.
+
+// Lookup tables per IntType:
+// vmax/base and vmin/base are precomputed because division costs at least 8ns.
+// TODO(junyer): Doing this per base instead (i.e. an array of structs, not a
+// struct of arrays) would probably be better in terms of d-cache for the most
+// commonly used bases.
+template <typename IntType>
+struct LookupTables {
+ ABSL_CONST_INIT static const IntType kVmaxOverBase[];
+ ABSL_CONST_INIT static const IntType kVminOverBase[];
+};
+
+// An array initializer macro for X/base where base in [0, 36].
+// However, note that lookups for base in [0, 1] should never happen because
+// base has been validated to be in [2, 36] by safe_parse_sign_and_base().
+#define X_OVER_BASE_INITIALIZER(X) \
+ { \
+ 0, 0, X / 2, X / 3, X / 4, X / 5, X / 6, X / 7, X / 8, X / 9, X / 10, \
+ X / 11, X / 12, X / 13, X / 14, X / 15, X / 16, X / 17, X / 18, \
+ X / 19, X / 20, X / 21, X / 22, X / 23, X / 24, X / 25, X / 26, \
+ X / 27, X / 28, X / 29, X / 30, X / 31, X / 32, X / 33, X / 34, \
+ X / 35, X / 36, \
+ }
+
+// This kVmaxOverBase is generated with
+// for (int base = 2; base < 37; ++base) {
+// absl::uint128 max = std::numeric_limits<absl::uint128>::max();
+// auto result = max / base;
+// std::cout << " MakeUint128(" << absl::Uint128High64(result) << "u, "
+// << absl::Uint128Low64(result) << "u),\n";
+// }
+// See https://godbolt.org/z/aneYsb
+//
+// uint128& operator/=(uint128) is not constexpr, so hardcode the resulting
+// array to avoid a static initializer.
+template<>
+const uint128 LookupTables<uint128>::kVmaxOverBase[] = {
+ 0,
+ 0,
+ MakeUint128(9223372036854775807u, 18446744073709551615u),
+ MakeUint128(6148914691236517205u, 6148914691236517205u),
+ MakeUint128(4611686018427387903u, 18446744073709551615u),
+ MakeUint128(3689348814741910323u, 3689348814741910323u),
+ MakeUint128(3074457345618258602u, 12297829382473034410u),
+ MakeUint128(2635249153387078802u, 5270498306774157604u),
+ MakeUint128(2305843009213693951u, 18446744073709551615u),
+ MakeUint128(2049638230412172401u, 14347467612885206812u),
+ MakeUint128(1844674407370955161u, 11068046444225730969u),
+ MakeUint128(1676976733973595601u, 8384883669867978007u),
+ MakeUint128(1537228672809129301u, 6148914691236517205u),
+ MakeUint128(1418980313362273201u, 4256940940086819603u),
+ MakeUint128(1317624576693539401u, 2635249153387078802u),
+ MakeUint128(1229782938247303441u, 1229782938247303441u),
+ MakeUint128(1152921504606846975u, 18446744073709551615u),
+ MakeUint128(1085102592571150095u, 1085102592571150095u),
+ MakeUint128(1024819115206086200u, 16397105843297379214u),
+ MakeUint128(970881267037344821u, 16504981539634861972u),
+ MakeUint128(922337203685477580u, 14757395258967641292u),
+ MakeUint128(878416384462359600u, 14054662151397753612u),
+ MakeUint128(838488366986797800u, 13415813871788764811u),
+ MakeUint128(802032351030850070u, 4812194106185100421u),
+ MakeUint128(768614336404564650u, 12297829382473034410u),
+ MakeUint128(737869762948382064u, 11805916207174113034u),
+ MakeUint128(709490156681136600u, 11351842506898185609u),
+ MakeUint128(683212743470724133u, 17080318586768103348u),
+ MakeUint128(658812288346769700u, 10540996613548315209u),
+ MakeUint128(636094623231363848u, 15266270957552732371u),
+ MakeUint128(614891469123651720u, 9838263505978427528u),
+ MakeUint128(595056260442243600u, 9520900167075897608u),
+ MakeUint128(576460752303423487u, 18446744073709551615u),
+ MakeUint128(558992244657865200u, 8943875914525843207u),
+ MakeUint128(542551296285575047u, 9765923333140350855u),
+ MakeUint128(527049830677415760u, 8432797290838652167u),
+ MakeUint128(512409557603043100u, 8198552921648689607u),
+};
+
+// This kVmaxOverBase generated with
+// for (int base = 2; base < 37; ++base) {
+// absl::int128 max = std::numeric_limits<absl::int128>::max();
+// auto result = max / base;
+// std::cout << "\tMakeInt128(" << absl::Int128High64(result) << ", "
+// << absl::Int128Low64(result) << "u),\n";
+// }
+// See https://godbolt.org/z/7djYWz
+//
+// int128& operator/=(int128) is not constexpr, so hardcode the resulting array
+// to avoid a static initializer.
+template<>
+const int128 LookupTables<int128>::kVmaxOverBase[] = {
+ 0,
+ 0,
+ MakeInt128(4611686018427387903, 18446744073709551615u),
+ MakeInt128(3074457345618258602, 12297829382473034410u),
+ MakeInt128(2305843009213693951, 18446744073709551615u),
+ MakeInt128(1844674407370955161, 11068046444225730969u),
+ MakeInt128(1537228672809129301, 6148914691236517205u),
+ MakeInt128(1317624576693539401, 2635249153387078802u),
+ MakeInt128(1152921504606846975, 18446744073709551615u),
+ MakeInt128(1024819115206086200, 16397105843297379214u),
+ MakeInt128(922337203685477580, 14757395258967641292u),
+ MakeInt128(838488366986797800, 13415813871788764811u),
+ MakeInt128(768614336404564650, 12297829382473034410u),
+ MakeInt128(709490156681136600, 11351842506898185609u),
+ MakeInt128(658812288346769700, 10540996613548315209u),
+ MakeInt128(614891469123651720, 9838263505978427528u),
+ MakeInt128(576460752303423487, 18446744073709551615u),
+ MakeInt128(542551296285575047, 9765923333140350855u),
+ MakeInt128(512409557603043100, 8198552921648689607u),
+ MakeInt128(485440633518672410, 17475862806672206794u),
+ MakeInt128(461168601842738790, 7378697629483820646u),
+ MakeInt128(439208192231179800, 7027331075698876806u),
+ MakeInt128(419244183493398900, 6707906935894382405u),
+ MakeInt128(401016175515425035, 2406097053092550210u),
+ MakeInt128(384307168202282325, 6148914691236517205u),
+ MakeInt128(368934881474191032, 5902958103587056517u),
+ MakeInt128(354745078340568300, 5675921253449092804u),
+ MakeInt128(341606371735362066, 17763531330238827482u),
+ MakeInt128(329406144173384850, 5270498306774157604u),
+ MakeInt128(318047311615681924, 7633135478776366185u),
+ MakeInt128(307445734561825860, 4919131752989213764u),
+ MakeInt128(297528130221121800, 4760450083537948804u),
+ MakeInt128(288230376151711743, 18446744073709551615u),
+ MakeInt128(279496122328932600, 4471937957262921603u),
+ MakeInt128(271275648142787523, 14106333703424951235u),
+ MakeInt128(263524915338707880, 4216398645419326083u),
+ MakeInt128(256204778801521550, 4099276460824344803u),
+};
+
+// This kVminOverBase generated with
+// for (int base = 2; base < 37; ++base) {
+// absl::int128 min = std::numeric_limits<absl::int128>::min();
+// auto result = min / base;
+// std::cout << "\tMakeInt128(" << absl::Int128High64(result) << ", "
+// << absl::Int128Low64(result) << "u),\n";
+// }
+//
+// See https://godbolt.org/z/7djYWz
+//
+// int128& operator/=(int128) is not constexpr, so hardcode the resulting array
+// to avoid a static initializer.
+template<>
+const int128 LookupTables<int128>::kVminOverBase[] = {
+ 0,
+ 0,
+ MakeInt128(-4611686018427387904, 0u),
+ MakeInt128(-3074457345618258603, 6148914691236517206u),
+ MakeInt128(-2305843009213693952, 0u),
+ MakeInt128(-1844674407370955162, 7378697629483820647u),
+ MakeInt128(-1537228672809129302, 12297829382473034411u),
+ MakeInt128(-1317624576693539402, 15811494920322472814u),
+ MakeInt128(-1152921504606846976, 0u),
+ MakeInt128(-1024819115206086201, 2049638230412172402u),
+ MakeInt128(-922337203685477581, 3689348814741910324u),
+ MakeInt128(-838488366986797801, 5030930201920786805u),
+ MakeInt128(-768614336404564651, 6148914691236517206u),
+ MakeInt128(-709490156681136601, 7094901566811366007u),
+ MakeInt128(-658812288346769701, 7905747460161236407u),
+ MakeInt128(-614891469123651721, 8608480567731124088u),
+ MakeInt128(-576460752303423488, 0u),
+ MakeInt128(-542551296285575048, 8680820740569200761u),
+ MakeInt128(-512409557603043101, 10248191152060862009u),
+ MakeInt128(-485440633518672411, 970881267037344822u),
+ MakeInt128(-461168601842738791, 11068046444225730970u),
+ MakeInt128(-439208192231179801, 11419412998010674810u),
+ MakeInt128(-419244183493398901, 11738837137815169211u),
+ MakeInt128(-401016175515425036, 16040647020617001406u),
+ MakeInt128(-384307168202282326, 12297829382473034411u),
+ MakeInt128(-368934881474191033, 12543785970122495099u),
+ MakeInt128(-354745078340568301, 12770822820260458812u),
+ MakeInt128(-341606371735362067, 683212743470724134u),
+ MakeInt128(-329406144173384851, 13176245766935394012u),
+ MakeInt128(-318047311615681925, 10813608594933185431u),
+ MakeInt128(-307445734561825861, 13527612320720337852u),
+ MakeInt128(-297528130221121801, 13686293990171602812u),
+ MakeInt128(-288230376151711744, 0u),
+ MakeInt128(-279496122328932601, 13974806116446630013u),
+ MakeInt128(-271275648142787524, 4340410370284600381u),
+ MakeInt128(-263524915338707881, 14230345428290225533u),
+ MakeInt128(-256204778801521551, 14347467612885206813u),
+};
+
+template <typename IntType>
+const IntType LookupTables<IntType>::kVmaxOverBase[] =
+ X_OVER_BASE_INITIALIZER(std::numeric_limits<IntType>::max());
+
+template <typename IntType>
+const IntType LookupTables<IntType>::kVminOverBase[] =
+ X_OVER_BASE_INITIALIZER(std::numeric_limits<IntType>::min());
+
+#undef X_OVER_BASE_INITIALIZER
+
+template <typename IntType>
+inline bool safe_parse_positive_int(absl::string_view text, int base,
+ IntType* value_p) {
+ IntType value = 0;
+ const IntType vmax = std::numeric_limits<IntType>::max();
+ assert(vmax > 0);
+ assert(base >= 0);
+ assert(vmax >= static_cast<IntType>(base));
+ const IntType vmax_over_base = LookupTables<IntType>::kVmaxOverBase[base];
+ assert(base < 2 ||
+ std::numeric_limits<IntType>::max() / base == vmax_over_base);
+ const char* start = text.data();
+ const char* end = start + text.size();
+ // loop over digits
+ for (; start < end; ++start) {
+ unsigned char c = static_cast<unsigned char>(start[0]);
+ int digit = kAsciiToInt[c];
+ if (digit >= base) {
+ *value_p = value;
+ return false;
+ }
+ if (value > vmax_over_base) {
+ *value_p = vmax;
+ return false;
+ }
+ value *= base;
+ if (value > vmax - digit) {
+ *value_p = vmax;
+ return false;
+ }
+ value += digit;
+ }
+ *value_p = value;
+ return true;
+}
+
+template <typename IntType>
+inline bool safe_parse_negative_int(absl::string_view text, int base,
+ IntType* value_p) {
+ IntType value = 0;
+ const IntType vmin = std::numeric_limits<IntType>::min();
+ assert(vmin < 0);
+ assert(vmin <= 0 - base);
+ IntType vmin_over_base = LookupTables<IntType>::kVminOverBase[base];
+ assert(base < 2 ||
+ std::numeric_limits<IntType>::min() / base == vmin_over_base);
+ // 2003 c++ standard [expr.mul]
+ // "... the sign of the remainder is implementation-defined."
+ // Although (vmin/base)*base + vmin%base is always vmin.
+ // 2011 c++ standard tightens the spec but we cannot rely on it.
+ // TODO(junyer): Handle this in the lookup table generation.
+ if (vmin % base > 0) {
+ vmin_over_base += 1;
+ }
+ const char* start = text.data();
+ const char* end = start + text.size();
+ // loop over digits
+ for (; start < end; ++start) {
+ unsigned char c = static_cast<unsigned char>(start[0]);
+ int digit = kAsciiToInt[c];
+ if (digit >= base) {
+ *value_p = value;
+ return false;
+ }
+ if (value < vmin_over_base) {
+ *value_p = vmin;
+ return false;
+ }
+ value *= base;
+ if (value < vmin + digit) {
+ *value_p = vmin;
+ return false;
+ }
+ value -= digit;
+ }
+ *value_p = value;
+ return true;
+}
+
+// Input format based on POSIX.1-2008 strtol
+// http://pubs.opengroup.org/onlinepubs/9699919799/functions/strtol.html
+template <typename IntType>
+inline bool safe_int_internal(absl::string_view text, IntType* value_p,
+ int base) {
+ *value_p = 0;
+ bool negative;
+ if (!safe_parse_sign_and_base(&text, &base, &negative)) {
+ return false;
+ }
+ if (!negative) {
+ return safe_parse_positive_int(text, base, value_p);
+ } else {
+ return safe_parse_negative_int(text, base, value_p);
+ }
+}
+
+template <typename IntType>
+inline bool safe_uint_internal(absl::string_view text, IntType* value_p,
+ int base) {
+ *value_p = 0;
+ bool negative;
+ if (!safe_parse_sign_and_base(&text, &base, &negative) || negative) {
+ return false;
+ }
+ return safe_parse_positive_int(text, base, value_p);
+}
+} // anonymous namespace
+
+namespace numbers_internal {
+
+// Digit conversion.
+ABSL_CONST_INIT ABSL_DLL const char kHexChar[] =
+ "0123456789abcdef";
+
+ABSL_CONST_INIT ABSL_DLL const char kHexTable[513] =
+ "000102030405060708090a0b0c0d0e0f"
+ "101112131415161718191a1b1c1d1e1f"
+ "202122232425262728292a2b2c2d2e2f"
+ "303132333435363738393a3b3c3d3e3f"
+ "404142434445464748494a4b4c4d4e4f"
+ "505152535455565758595a5b5c5d5e5f"
+ "606162636465666768696a6b6c6d6e6f"
+ "707172737475767778797a7b7c7d7e7f"
+ "808182838485868788898a8b8c8d8e8f"
+ "909192939495969798999a9b9c9d9e9f"
+ "a0a1a2a3a4a5a6a7a8a9aaabacadaeaf"
+ "b0b1b2b3b4b5b6b7b8b9babbbcbdbebf"
+ "c0c1c2c3c4c5c6c7c8c9cacbcccdcecf"
+ "d0d1d2d3d4d5d6d7d8d9dadbdcdddedf"
+ "e0e1e2e3e4e5e6e7e8e9eaebecedeeef"
+ "f0f1f2f3f4f5f6f7f8f9fafbfcfdfeff";
+
+ABSL_CONST_INIT ABSL_DLL const char two_ASCII_digits[100][2] = {
+ {'0', '0'}, {'0', '1'}, {'0', '2'}, {'0', '3'}, {'0', '4'}, {'0', '5'},
+ {'0', '6'}, {'0', '7'}, {'0', '8'}, {'0', '9'}, {'1', '0'}, {'1', '1'},
+ {'1', '2'}, {'1', '3'}, {'1', '4'}, {'1', '5'}, {'1', '6'}, {'1', '7'},
+ {'1', '8'}, {'1', '9'}, {'2', '0'}, {'2', '1'}, {'2', '2'}, {'2', '3'},
+ {'2', '4'}, {'2', '5'}, {'2', '6'}, {'2', '7'}, {'2', '8'}, {'2', '9'},
+ {'3', '0'}, {'3', '1'}, {'3', '2'}, {'3', '3'}, {'3', '4'}, {'3', '5'},
+ {'3', '6'}, {'3', '7'}, {'3', '8'}, {'3', '9'}, {'4', '0'}, {'4', '1'},
+ {'4', '2'}, {'4', '3'}, {'4', '4'}, {'4', '5'}, {'4', '6'}, {'4', '7'},
+ {'4', '8'}, {'4', '9'}, {'5', '0'}, {'5', '1'}, {'5', '2'}, {'5', '3'},
+ {'5', '4'}, {'5', '5'}, {'5', '6'}, {'5', '7'}, {'5', '8'}, {'5', '9'},
+ {'6', '0'}, {'6', '1'}, {'6', '2'}, {'6', '3'}, {'6', '4'}, {'6', '5'},
+ {'6', '6'}, {'6', '7'}, {'6', '8'}, {'6', '9'}, {'7', '0'}, {'7', '1'},
+ {'7', '2'}, {'7', '3'}, {'7', '4'}, {'7', '5'}, {'7', '6'}, {'7', '7'},
+ {'7', '8'}, {'7', '9'}, {'8', '0'}, {'8', '1'}, {'8', '2'}, {'8', '3'},
+ {'8', '4'}, {'8', '5'}, {'8', '6'}, {'8', '7'}, {'8', '8'}, {'8', '9'},
+ {'9', '0'}, {'9', '1'}, {'9', '2'}, {'9', '3'}, {'9', '4'}, {'9', '5'},
+ {'9', '6'}, {'9', '7'}, {'9', '8'}, {'9', '9'}};
+
+bool safe_strto32_base(absl::string_view text, int32_t* value, int base) {
+ return safe_int_internal<int32_t>(text, value, base);
+}
+
+bool safe_strto64_base(absl::string_view text, int64_t* value, int base) {
+ return safe_int_internal<int64_t>(text, value, base);
+}
+
+bool safe_strto128_base(absl::string_view text, int128* value, int base) {
+ return safe_int_internal<absl::int128>(text, value, base);
+}
+
+bool safe_strtou32_base(absl::string_view text, uint32_t* value, int base) {
+ return safe_uint_internal<uint32_t>(text, value, base);
+}
+
+bool safe_strtou64_base(absl::string_view text, uint64_t* value, int base) {
+ return safe_uint_internal<uint64_t>(text, value, base);
+}
+
+bool safe_strtou128_base(absl::string_view text, uint128* value, int base) {
+ return safe_uint_internal<absl::uint128>(text, value, base);
+}
+
+} // namespace numbers_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/strings/numbers.h b/third_party/abseil/src/absl/strings/numbers.h
new file mode 100644
index 0000000..2e004b4
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/numbers.h
@@ -0,0 +1,273 @@
+//
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: numbers.h
+// -----------------------------------------------------------------------------
+//
+// This package contains functions for converting strings to numbers. For
+// converting numbers to strings, use `StrCat()` or `StrAppend()` in str_cat.h,
+// which automatically detect and convert most number values appropriately.
+
+#ifndef ABSL_STRINGS_NUMBERS_H_
+#define ABSL_STRINGS_NUMBERS_H_
+
+#ifdef __SSE4_2__
+#include <x86intrin.h>
+#endif
+
+#include <cstddef>
+#include <cstdlib>
+#include <cstring>
+#include <ctime>
+#include <limits>
+#include <string>
+#include <type_traits>
+
+#include "absl/base/config.h"
+#include "absl/base/internal/bits.h"
+#ifdef __SSE4_2__
+// TODO(jorg): Remove this when we figure out the right way
+// to swap bytes on SSE 4.2 that works with the compilers
+// we claim to support. Also, add tests for the compiler
+// that doesn't support the Intel _bswap64 intrinsic but
+// does support all the SSE 4.2 intrinsics
+#include "absl/base/internal/endian.h"
+#endif
+#include "absl/base/macros.h"
+#include "absl/base/port.h"
+#include "absl/numeric/int128.h"
+#include "absl/strings/string_view.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+// SimpleAtoi()
+//
+// Converts the given string (optionally followed or preceded by ASCII
+// whitespace) into an integer value, returning `true` if successful. The string
+// must reflect a base-10 integer whose value falls within the range of the
+// integer type (optionally preceded by a `+` or `-`). If any errors are
+// encountered, this function returns `false`, leaving `out` in an unspecified
+// state.
+template <typename int_type>
+ABSL_MUST_USE_RESULT bool SimpleAtoi(absl::string_view str, int_type* out);
+
+// SimpleAtof()
+//
+// Converts the given string (optionally followed or preceded by ASCII
+// whitespace) into a float, which may be rounded on overflow or underflow,
+// returning `true` if successful.
+// See https://en.cppreference.com/w/c/string/byte/strtof for details about the
+// allowed formats for `str`, except SimpleAtof() is locale-independent and will
+// always use the "C" locale. If any errors are encountered, this function
+// returns `false`, leaving `out` in an unspecified state.
+ABSL_MUST_USE_RESULT bool SimpleAtof(absl::string_view str, float* out);
+
+// SimpleAtod()
+//
+// Converts the given string (optionally followed or preceded by ASCII
+// whitespace) into a double, which may be rounded on overflow or underflow,
+// returning `true` if successful.
+// See https://en.cppreference.com/w/c/string/byte/strtof for details about the
+// allowed formats for `str`, except SimpleAtod is locale-independent and will
+// always use the "C" locale. If any errors are encountered, this function
+// returns `false`, leaving `out` in an unspecified state.
+ABSL_MUST_USE_RESULT bool SimpleAtod(absl::string_view str, double* out);
+
+// SimpleAtob()
+//
+// Converts the given string into a boolean, returning `true` if successful.
+// The following case-insensitive strings are interpreted as boolean `true`:
+// "true", "t", "yes", "y", "1". The following case-insensitive strings
+// are interpreted as boolean `false`: "false", "f", "no", "n", "0". If any
+// errors are encountered, this function returns `false`, leaving `out` in an
+// unspecified state.
+ABSL_MUST_USE_RESULT bool SimpleAtob(absl::string_view str, bool* out);
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+// End of public API. Implementation details follow.
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace numbers_internal {
+
+// Digit conversion.
+ABSL_DLL extern const char kHexChar[17]; // 0123456789abcdef
+ABSL_DLL extern const char
+ kHexTable[513]; // 000102030405060708090a0b0c0d0e0f1011...
+ABSL_DLL extern const char
+ two_ASCII_digits[100][2]; // 00, 01, 02, 03...
+
+// Writes a two-character representation of 'i' to 'buf'. 'i' must be in the
+// range 0 <= i < 100, and buf must have space for two characters. Example:
+// char buf[2];
+// PutTwoDigits(42, buf);
+// // buf[0] == '4'
+// // buf[1] == '2'
+inline void PutTwoDigits(size_t i, char* buf) {
+ assert(i < 100);
+ memcpy(buf, two_ASCII_digits[i], 2);
+}
+
+// safe_strto?() functions for implementing SimpleAtoi()
+bool safe_strto32_base(absl::string_view text, int32_t* value, int base);
+bool safe_strto64_base(absl::string_view text, int64_t* value, int base);
+bool safe_strto128_base(absl::string_view text, absl::int128* value,
+ int base);
+bool safe_strtou32_base(absl::string_view text, uint32_t* value, int base);
+bool safe_strtou64_base(absl::string_view text, uint64_t* value, int base);
+bool safe_strtou128_base(absl::string_view text, absl::uint128* value,
+ int base);
+
+static const int kFastToBufferSize = 32;
+static const int kSixDigitsToBufferSize = 16;
+
+// Helper function for fast formatting of floating-point values.
+// The result is the same as printf's "%g", a.k.a. "%.6g"; that is, six
+// significant digits are returned, trailing zeros are removed, and numbers
+// outside the range 0.0001-999999 are output using scientific notation
+// (1.23456e+06). This routine is heavily optimized.
+// Required buffer size is `kSixDigitsToBufferSize`.
+size_t SixDigitsToBuffer(double d, char* buffer);
+
+// These functions are intended for speed. All functions take an output buffer
+// as an argument and return a pointer to the last byte they wrote, which is the
+// terminating '\0'. At most `kFastToBufferSize` bytes are written.
+char* FastIntToBuffer(int32_t, char*);
+char* FastIntToBuffer(uint32_t, char*);
+char* FastIntToBuffer(int64_t, char*);
+char* FastIntToBuffer(uint64_t, char*);
+
+// For enums and integer types that are not an exact match for the types above,
+// use templates to call the appropriate one of the four overloads above.
+template <typename int_type>
+char* FastIntToBuffer(int_type i, char* buffer) {
+ static_assert(sizeof(i) <= 64 / 8,
+ "FastIntToBuffer works only with 64-bit-or-less integers.");
+ // TODO(jorg): This signed-ness check is used because it works correctly
+ // with enums, and it also serves to check that int_type is not a pointer.
+ // If one day something like std::is_signed<enum E> works, switch to it.
+ if (static_cast<int_type>(1) - 2 < 0) { // Signed
+ if (sizeof(i) > 32 / 8) { // 33-bit to 64-bit
+ return FastIntToBuffer(static_cast<int64_t>(i), buffer);
+ } else { // 32-bit or less
+ return FastIntToBuffer(static_cast<int32_t>(i), buffer);
+ }
+ } else { // Unsigned
+ if (sizeof(i) > 32 / 8) { // 33-bit to 64-bit
+ return FastIntToBuffer(static_cast<uint64_t>(i), buffer);
+ } else { // 32-bit or less
+ return FastIntToBuffer(static_cast<uint32_t>(i), buffer);
+ }
+ }
+}
+
+// Implementation of SimpleAtoi, generalized to support arbitrary base (used
+// with base different from 10 elsewhere in Abseil implementation).
+template <typename int_type>
+ABSL_MUST_USE_RESULT bool safe_strtoi_base(absl::string_view s, int_type* out,
+ int base) {
+ static_assert(sizeof(*out) == 4 || sizeof(*out) == 8,
+ "SimpleAtoi works only with 32-bit or 64-bit integers.");
+ static_assert(!std::is_floating_point<int_type>::value,
+ "Use SimpleAtof or SimpleAtod instead.");
+ bool parsed;
+ // TODO(jorg): This signed-ness check is used because it works correctly
+ // with enums, and it also serves to check that int_type is not a pointer.
+ // If one day something like std::is_signed<enum E> works, switch to it.
+ if (static_cast<int_type>(1) - 2 < 0) { // Signed
+ if (sizeof(*out) == 64 / 8) { // 64-bit
+ int64_t val;
+ parsed = numbers_internal::safe_strto64_base(s, &val, base);
+ *out = static_cast<int_type>(val);
+ } else { // 32-bit
+ int32_t val;
+ parsed = numbers_internal::safe_strto32_base(s, &val, base);
+ *out = static_cast<int_type>(val);
+ }
+ } else { // Unsigned
+ if (sizeof(*out) == 64 / 8) { // 64-bit
+ uint64_t val;
+ parsed = numbers_internal::safe_strtou64_base(s, &val, base);
+ *out = static_cast<int_type>(val);
+ } else { // 32-bit
+ uint32_t val;
+ parsed = numbers_internal::safe_strtou32_base(s, &val, base);
+ *out = static_cast<int_type>(val);
+ }
+ }
+ return parsed;
+}
+
+// FastHexToBufferZeroPad16()
+//
+// Outputs `val` into `out` as if by `snprintf(out, 17, "%016x", val)` but
+// without the terminating null character. Thus `out` must be of length >= 16.
+// Returns the number of non-pad digits of the output (it can never be zero
+// since 0 has one digit).
+inline size_t FastHexToBufferZeroPad16(uint64_t val, char* out) {
+#ifdef __SSE4_2__
+ uint64_t be = absl::big_endian::FromHost64(val);
+ const auto kNibbleMask = _mm_set1_epi8(0xf);
+ const auto kHexDigits = _mm_setr_epi8('0', '1', '2', '3', '4', '5', '6', '7',
+ '8', '9', 'a', 'b', 'c', 'd', 'e', 'f');
+ auto v = _mm_loadl_epi64(reinterpret_cast<__m128i*>(&be)); // load lo dword
+ auto v4 = _mm_srli_epi64(v, 4); // shift 4 right
+ auto il = _mm_unpacklo_epi8(v4, v); // interleave bytes
+ auto m = _mm_and_si128(il, kNibbleMask); // mask out nibbles
+ auto hexchars = _mm_shuffle_epi8(kHexDigits, m); // hex chars
+ _mm_storeu_si128(reinterpret_cast<__m128i*>(out), hexchars);
+#else
+ for (int i = 0; i < 8; ++i) {
+ auto byte = (val >> (56 - 8 * i)) & 0xFF;
+ auto* hex = &absl::numbers_internal::kHexTable[byte * 2];
+ std::memcpy(out + 2 * i, hex, 2);
+ }
+#endif
+ // | 0x1 so that even 0 has 1 digit.
+ return 16 - absl::base_internal::CountLeadingZeros64(val | 0x1) / 4;
+}
+
+} // namespace numbers_internal
+
+// SimpleAtoi()
+//
+// Converts a string to an integer, using `safe_strto?()` functions for actual
+// parsing, returning `true` if successful. The `safe_strto?()` functions apply
+// strict checking; the string must be a base-10 integer, optionally followed or
+// preceded by ASCII whitespace, with a value in the range of the corresponding
+// integer type.
+template <typename int_type>
+ABSL_MUST_USE_RESULT bool SimpleAtoi(absl::string_view str, int_type* out) {
+ return numbers_internal::safe_strtoi_base(str, out, 10);
+}
+
+ABSL_MUST_USE_RESULT inline bool SimpleAtoi(absl::string_view str,
+ absl::int128* out) {
+ return numbers_internal::safe_strto128_base(str, out, 10);
+}
+
+ABSL_MUST_USE_RESULT inline bool SimpleAtoi(absl::string_view str,
+ absl::uint128* out) {
+ return numbers_internal::safe_strtou128_base(str, out, 10);
+}
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_STRINGS_NUMBERS_H_
diff --git a/third_party/abseil/src/absl/strings/numbers_benchmark.cc b/third_party/abseil/src/absl/strings/numbers_benchmark.cc
new file mode 100644
index 0000000..6e79b3e
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/numbers_benchmark.cc
@@ -0,0 +1,286 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <cstdint>
+#include <random>
+#include <string>
+#include <type_traits>
+#include <vector>
+
+#include "benchmark/benchmark.h"
+#include "absl/base/internal/raw_logging.h"
+#include "absl/random/distributions.h"
+#include "absl/random/random.h"
+#include "absl/strings/numbers.h"
+
+namespace {
+
+template <typename T>
+void BM_FastIntToBuffer(benchmark::State& state) {
+ const int inc = state.range(0);
+ char buf[absl::numbers_internal::kFastToBufferSize];
+ // Use the unsigned type to increment to take advantage of well-defined
+ // modular arithmetic.
+ typename std::make_unsigned<T>::type x = 0;
+ for (auto _ : state) {
+ absl::numbers_internal::FastIntToBuffer(static_cast<T>(x), buf);
+ x += inc;
+ }
+}
+BENCHMARK_TEMPLATE(BM_FastIntToBuffer, int32_t)->Range(0, 1 << 15);
+BENCHMARK_TEMPLATE(BM_FastIntToBuffer, int64_t)->Range(0, 1 << 30);
+
+// Creates an integer that would be printed as `num_digits` repeated 7s in the
+// given `base`. `base` must be greater than or equal to 8.
+int64_t RepeatedSevens(int num_digits, int base) {
+ ABSL_RAW_CHECK(base >= 8, "");
+ int64_t num = 7;
+ while (--num_digits) num = base * num + 7;
+ return num;
+}
+
+void BM_safe_strto32_string(benchmark::State& state) {
+ const int digits = state.range(0);
+ const int base = state.range(1);
+ std::string str(digits, '7'); // valid in octal, decimal and hex
+ int32_t value = 0;
+ for (auto _ : state) {
+ benchmark::DoNotOptimize(
+ absl::numbers_internal::safe_strto32_base(str, &value, base));
+ }
+ ABSL_RAW_CHECK(value == RepeatedSevens(digits, base), "");
+}
+BENCHMARK(BM_safe_strto32_string)
+ ->ArgPair(1, 8)
+ ->ArgPair(1, 10)
+ ->ArgPair(1, 16)
+ ->ArgPair(2, 8)
+ ->ArgPair(2, 10)
+ ->ArgPair(2, 16)
+ ->ArgPair(4, 8)
+ ->ArgPair(4, 10)
+ ->ArgPair(4, 16)
+ ->ArgPair(8, 8)
+ ->ArgPair(8, 10)
+ ->ArgPair(8, 16)
+ ->ArgPair(10, 8)
+ ->ArgPair(9, 10);
+
+void BM_safe_strto64_string(benchmark::State& state) {
+ const int digits = state.range(0);
+ const int base = state.range(1);
+ std::string str(digits, '7'); // valid in octal, decimal and hex
+ int64_t value = 0;
+ for (auto _ : state) {
+ benchmark::DoNotOptimize(
+ absl::numbers_internal::safe_strto64_base(str, &value, base));
+ }
+ ABSL_RAW_CHECK(value == RepeatedSevens(digits, base), "");
+}
+BENCHMARK(BM_safe_strto64_string)
+ ->ArgPair(1, 8)
+ ->ArgPair(1, 10)
+ ->ArgPair(1, 16)
+ ->ArgPair(2, 8)
+ ->ArgPair(2, 10)
+ ->ArgPair(2, 16)
+ ->ArgPair(4, 8)
+ ->ArgPair(4, 10)
+ ->ArgPair(4, 16)
+ ->ArgPair(8, 8)
+ ->ArgPair(8, 10)
+ ->ArgPair(8, 16)
+ ->ArgPair(16, 8)
+ ->ArgPair(16, 10)
+ ->ArgPair(16, 16);
+
+void BM_safe_strtou32_string(benchmark::State& state) {
+ const int digits = state.range(0);
+ const int base = state.range(1);
+ std::string str(digits, '7'); // valid in octal, decimal and hex
+ uint32_t value = 0;
+ for (auto _ : state) {
+ benchmark::DoNotOptimize(
+ absl::numbers_internal::safe_strtou32_base(str, &value, base));
+ }
+ ABSL_RAW_CHECK(value == RepeatedSevens(digits, base), "");
+}
+BENCHMARK(BM_safe_strtou32_string)
+ ->ArgPair(1, 8)
+ ->ArgPair(1, 10)
+ ->ArgPair(1, 16)
+ ->ArgPair(2, 8)
+ ->ArgPair(2, 10)
+ ->ArgPair(2, 16)
+ ->ArgPair(4, 8)
+ ->ArgPair(4, 10)
+ ->ArgPair(4, 16)
+ ->ArgPair(8, 8)
+ ->ArgPair(8, 10)
+ ->ArgPair(8, 16)
+ ->ArgPair(10, 8)
+ ->ArgPair(9, 10);
+
+void BM_safe_strtou64_string(benchmark::State& state) {
+ const int digits = state.range(0);
+ const int base = state.range(1);
+ std::string str(digits, '7'); // valid in octal, decimal and hex
+ uint64_t value = 0;
+ for (auto _ : state) {
+ benchmark::DoNotOptimize(
+ absl::numbers_internal::safe_strtou64_base(str, &value, base));
+ }
+ ABSL_RAW_CHECK(value == RepeatedSevens(digits, base), "");
+}
+BENCHMARK(BM_safe_strtou64_string)
+ ->ArgPair(1, 8)
+ ->ArgPair(1, 10)
+ ->ArgPair(1, 16)
+ ->ArgPair(2, 8)
+ ->ArgPair(2, 10)
+ ->ArgPair(2, 16)
+ ->ArgPair(4, 8)
+ ->ArgPair(4, 10)
+ ->ArgPair(4, 16)
+ ->ArgPair(8, 8)
+ ->ArgPair(8, 10)
+ ->ArgPair(8, 16)
+ ->ArgPair(16, 8)
+ ->ArgPair(16, 10)
+ ->ArgPair(16, 16);
+
+// Returns a vector of `num_strings` strings. Each string represents a
+// floating point number with `num_digits` digits before the decimal point and
+// another `num_digits` digits after.
+std::vector<std::string> MakeFloatStrings(int num_strings, int num_digits) {
+ // For convenience, use a random number generator to generate the test data.
+ // We don't actually need random properties, so use a fixed seed.
+ std::minstd_rand0 rng(1);
+ std::uniform_int_distribution<int> random_digit('0', '9');
+
+ std::vector<std::string> float_strings(num_strings);
+ for (std::string& s : float_strings) {
+ s.reserve(2 * num_digits + 1);
+ for (int i = 0; i < num_digits; ++i) {
+ s.push_back(static_cast<char>(random_digit(rng)));
+ }
+ s.push_back('.');
+ for (int i = 0; i < num_digits; ++i) {
+ s.push_back(static_cast<char>(random_digit(rng)));
+ }
+ }
+ return float_strings;
+}
+
+template <typename StringType>
+StringType GetStringAs(const std::string& s) {
+ return static_cast<StringType>(s);
+}
+template <>
+const char* GetStringAs<const char*>(const std::string& s) {
+ return s.c_str();
+}
+
+template <typename StringType>
+std::vector<StringType> GetStringsAs(const std::vector<std::string>& strings) {
+ std::vector<StringType> result;
+ result.reserve(strings.size());
+ for (const std::string& s : strings) {
+ result.push_back(GetStringAs<StringType>(s));
+ }
+ return result;
+}
+
+template <typename T>
+void BM_SimpleAtof(benchmark::State& state) {
+ const int num_strings = state.range(0);
+ const int num_digits = state.range(1);
+ std::vector<std::string> backing_strings =
+ MakeFloatStrings(num_strings, num_digits);
+ std::vector<T> inputs = GetStringsAs<T>(backing_strings);
+ float value;
+ for (auto _ : state) {
+ for (const T& input : inputs) {
+ benchmark::DoNotOptimize(absl::SimpleAtof(input, &value));
+ }
+ }
+}
+BENCHMARK_TEMPLATE(BM_SimpleAtof, absl::string_view)
+ ->ArgPair(10, 1)
+ ->ArgPair(10, 2)
+ ->ArgPair(10, 4)
+ ->ArgPair(10, 8);
+BENCHMARK_TEMPLATE(BM_SimpleAtof, const char*)
+ ->ArgPair(10, 1)
+ ->ArgPair(10, 2)
+ ->ArgPair(10, 4)
+ ->ArgPair(10, 8);
+BENCHMARK_TEMPLATE(BM_SimpleAtof, std::string)
+ ->ArgPair(10, 1)
+ ->ArgPair(10, 2)
+ ->ArgPair(10, 4)
+ ->ArgPair(10, 8);
+
+template <typename T>
+void BM_SimpleAtod(benchmark::State& state) {
+ const int num_strings = state.range(0);
+ const int num_digits = state.range(1);
+ std::vector<std::string> backing_strings =
+ MakeFloatStrings(num_strings, num_digits);
+ std::vector<T> inputs = GetStringsAs<T>(backing_strings);
+ double value;
+ for (auto _ : state) {
+ for (const T& input : inputs) {
+ benchmark::DoNotOptimize(absl::SimpleAtod(input, &value));
+ }
+ }
+}
+BENCHMARK_TEMPLATE(BM_SimpleAtod, absl::string_view)
+ ->ArgPair(10, 1)
+ ->ArgPair(10, 2)
+ ->ArgPair(10, 4)
+ ->ArgPair(10, 8);
+BENCHMARK_TEMPLATE(BM_SimpleAtod, const char*)
+ ->ArgPair(10, 1)
+ ->ArgPair(10, 2)
+ ->ArgPair(10, 4)
+ ->ArgPair(10, 8);
+BENCHMARK_TEMPLATE(BM_SimpleAtod, std::string)
+ ->ArgPair(10, 1)
+ ->ArgPair(10, 2)
+ ->ArgPair(10, 4)
+ ->ArgPair(10, 8);
+
+void BM_FastHexToBufferZeroPad16(benchmark::State& state) {
+ absl::BitGen rng;
+ std::vector<uint64_t> nums;
+ nums.resize(1000);
+ auto min = std::numeric_limits<uint64_t>::min();
+ auto max = std::numeric_limits<uint64_t>::max();
+ for (auto& num : nums) {
+ num = absl::LogUniform(rng, min, max);
+ }
+
+ char buf[16];
+ while (state.KeepRunningBatch(nums.size())) {
+ for (auto num : nums) {
+ auto digits = absl::numbers_internal::FastHexToBufferZeroPad16(num, buf);
+ benchmark::DoNotOptimize(digits);
+ benchmark::DoNotOptimize(buf);
+ }
+ }
+}
+BENCHMARK(BM_FastHexToBufferZeroPad16);
+
+} // namespace
diff --git a/third_party/abseil/src/absl/strings/numbers_test.cc b/third_party/abseil/src/absl/strings/numbers_test.cc
new file mode 100644
index 0000000..4ab67fb
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/numbers_test.cc
@@ -0,0 +1,1356 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// This file tests string processing functions related to numeric values.
+
+#include "absl/strings/numbers.h"
+
+#include <sys/types.h>
+
+#include <cfenv> // NOLINT(build/c++11)
+#include <cinttypes>
+#include <climits>
+#include <cmath>
+#include <cstddef>
+#include <cstdint>
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+#include <limits>
+#include <numeric>
+#include <random>
+#include <set>
+#include <string>
+#include <vector>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/base/internal/raw_logging.h"
+#include "absl/random/distributions.h"
+#include "absl/random/random.h"
+#include "absl/strings/internal/numbers_test_common.h"
+#include "absl/strings/internal/ostringstream.h"
+#include "absl/strings/internal/pow10_helper.h"
+#include "absl/strings/str_cat.h"
+
+namespace {
+
+using absl::numbers_internal::kSixDigitsToBufferSize;
+using absl::numbers_internal::safe_strto32_base;
+using absl::numbers_internal::safe_strto64_base;
+using absl::numbers_internal::safe_strtou32_base;
+using absl::numbers_internal::safe_strtou64_base;
+using absl::numbers_internal::SixDigitsToBuffer;
+using absl::strings_internal::Itoa;
+using absl::strings_internal::strtouint32_test_cases;
+using absl::strings_internal::strtouint64_test_cases;
+using absl::SimpleAtoi;
+using testing::Eq;
+using testing::MatchesRegex;
+
+// Number of floats to test with.
+// 5,000,000 is a reasonable default for a test that only takes a few seconds.
+// 1,000,000,000+ triggers checking for all possible mantissa values for
+// double-precision tests. 2,000,000,000+ triggers checking for every possible
+// single-precision float.
+const int kFloatNumCases = 5000000;
+
+// This is a slow, brute-force routine to compute the exact base-10
+// representation of a double-precision floating-point number. It
+// is useful for debugging only.
+std::string PerfectDtoa(double d) {
+ if (d == 0) return "0";
+ if (d < 0) return "-" + PerfectDtoa(-d);
+
+ // Basic theory: decompose d into mantissa and exp, where
+ // d = mantissa * 2^exp, and exp is as close to zero as possible.
+ int64_t mantissa, exp = 0;
+ while (d >= 1ULL << 63) ++exp, d *= 0.5;
+ while ((mantissa = d) != d) --exp, d *= 2.0;
+
+ // Then convert mantissa to ASCII, and either double it (if
+ // exp > 0) or halve it (if exp < 0) repeatedly. "halve it"
+ // in this case means multiplying it by five and dividing by 10.
+ constexpr int maxlen = 1100; // worst case is actually 1030 or so.
+ char buf[maxlen + 5];
+ for (int64_t num = mantissa, pos = maxlen; --pos >= 0;) {
+ buf[pos] = '0' + (num % 10);
+ num /= 10;
+ }
+ char* begin = &buf[0];
+ char* end = buf + maxlen;
+ for (int i = 0; i != exp; i += (exp > 0) ? 1 : -1) {
+ int carry = 0;
+ for (char* p = end; --p != begin;) {
+ int dig = *p - '0';
+ dig = dig * (exp > 0 ? 2 : 5) + carry;
+ carry = dig / 10;
+ dig %= 10;
+ *p = '0' + dig;
+ }
+ }
+ if (exp < 0) {
+ // "dividing by 10" above means we have to add the decimal point.
+ memmove(end + 1 + exp, end + exp, 1 - exp);
+ end[exp] = '.';
+ ++end;
+ }
+ while (*begin == '0' && begin[1] != '.') ++begin;
+ return {begin, end};
+}
+
+TEST(ToString, PerfectDtoa) {
+ EXPECT_THAT(PerfectDtoa(1), Eq("1"));
+ EXPECT_THAT(PerfectDtoa(0.1),
+ Eq("0.1000000000000000055511151231257827021181583404541015625"));
+ EXPECT_THAT(PerfectDtoa(1e24), Eq("999999999999999983222784"));
+ EXPECT_THAT(PerfectDtoa(5e-324), MatchesRegex("0.0000.*625"));
+ for (int i = 0; i < 100; ++i) {
+ for (double multiplier :
+ {1e-300, 1e-200, 1e-100, 0.1, 1.0, 10.0, 1e100, 1e300}) {
+ double d = multiplier * i;
+ std::string s = PerfectDtoa(d);
+ EXPECT_DOUBLE_EQ(d, strtod(s.c_str(), nullptr));
+ }
+ }
+}
+
+template <typename integer>
+struct MyInteger {
+ integer i;
+ explicit constexpr MyInteger(integer i) : i(i) {}
+ constexpr operator integer() const { return i; }
+
+ constexpr MyInteger operator+(MyInteger other) const { return i + other.i; }
+ constexpr MyInteger operator-(MyInteger other) const { return i - other.i; }
+ constexpr MyInteger operator*(MyInteger other) const { return i * other.i; }
+ constexpr MyInteger operator/(MyInteger other) const { return i / other.i; }
+
+ constexpr bool operator<(MyInteger other) const { return i < other.i; }
+ constexpr bool operator<=(MyInteger other) const { return i <= other.i; }
+ constexpr bool operator==(MyInteger other) const { return i == other.i; }
+ constexpr bool operator>=(MyInteger other) const { return i >= other.i; }
+ constexpr bool operator>(MyInteger other) const { return i > other.i; }
+ constexpr bool operator!=(MyInteger other) const { return i != other.i; }
+
+ integer as_integer() const { return i; }
+};
+
+typedef MyInteger<int64_t> MyInt64;
+typedef MyInteger<uint64_t> MyUInt64;
+
+void CheckInt32(int32_t x) {
+ char buffer[absl::numbers_internal::kFastToBufferSize];
+ char* actual = absl::numbers_internal::FastIntToBuffer(x, buffer);
+ std::string expected = std::to_string(x);
+ EXPECT_EQ(expected, std::string(buffer, actual)) << " Input " << x;
+
+ char* generic_actual = absl::numbers_internal::FastIntToBuffer(x, buffer);
+ EXPECT_EQ(expected, std::string(buffer, generic_actual)) << " Input " << x;
+}
+
+void CheckInt64(int64_t x) {
+ char buffer[absl::numbers_internal::kFastToBufferSize + 3];
+ buffer[0] = '*';
+ buffer[23] = '*';
+ buffer[24] = '*';
+ char* actual = absl::numbers_internal::FastIntToBuffer(x, &buffer[1]);
+ std::string expected = std::to_string(x);
+ EXPECT_EQ(expected, std::string(&buffer[1], actual)) << " Input " << x;
+ EXPECT_EQ(buffer[0], '*');
+ EXPECT_EQ(buffer[23], '*');
+ EXPECT_EQ(buffer[24], '*');
+
+ char* my_actual =
+ absl::numbers_internal::FastIntToBuffer(MyInt64(x), &buffer[1]);
+ EXPECT_EQ(expected, std::string(&buffer[1], my_actual)) << " Input " << x;
+}
+
+void CheckUInt32(uint32_t x) {
+ char buffer[absl::numbers_internal::kFastToBufferSize];
+ char* actual = absl::numbers_internal::FastIntToBuffer(x, buffer);
+ std::string expected = std::to_string(x);
+ EXPECT_EQ(expected, std::string(buffer, actual)) << " Input " << x;
+
+ char* generic_actual = absl::numbers_internal::FastIntToBuffer(x, buffer);
+ EXPECT_EQ(expected, std::string(buffer, generic_actual)) << " Input " << x;
+}
+
+void CheckUInt64(uint64_t x) {
+ char buffer[absl::numbers_internal::kFastToBufferSize + 1];
+ char* actual = absl::numbers_internal::FastIntToBuffer(x, &buffer[1]);
+ std::string expected = std::to_string(x);
+ EXPECT_EQ(expected, std::string(&buffer[1], actual)) << " Input " << x;
+
+ char* generic_actual = absl::numbers_internal::FastIntToBuffer(x, &buffer[1]);
+ EXPECT_EQ(expected, std::string(&buffer[1], generic_actual))
+ << " Input " << x;
+
+ char* my_actual =
+ absl::numbers_internal::FastIntToBuffer(MyUInt64(x), &buffer[1]);
+ EXPECT_EQ(expected, std::string(&buffer[1], my_actual)) << " Input " << x;
+}
+
+void CheckHex64(uint64_t v) {
+ char expected[16 + 1];
+ std::string actual = absl::StrCat(absl::Hex(v, absl::kZeroPad16));
+ snprintf(expected, sizeof(expected), "%016" PRIx64, static_cast<uint64_t>(v));
+ EXPECT_EQ(expected, actual) << " Input " << v;
+ actual = absl::StrCat(absl::Hex(v, absl::kSpacePad16));
+ snprintf(expected, sizeof(expected), "%16" PRIx64, static_cast<uint64_t>(v));
+ EXPECT_EQ(expected, actual) << " Input " << v;
+}
+
+TEST(Numbers, TestFastPrints) {
+ for (int i = -100; i <= 100; i++) {
+ CheckInt32(i);
+ CheckInt64(i);
+ }
+ for (int i = 0; i <= 100; i++) {
+ CheckUInt32(i);
+ CheckUInt64(i);
+ }
+ // Test min int to make sure that works
+ CheckInt32(INT_MIN);
+ CheckInt32(INT_MAX);
+ CheckInt64(LONG_MIN);
+ CheckInt64(uint64_t{1000000000});
+ CheckInt64(uint64_t{9999999999});
+ CheckInt64(uint64_t{100000000000000});
+ CheckInt64(uint64_t{999999999999999});
+ CheckInt64(uint64_t{1000000000000000000});
+ CheckInt64(uint64_t{1199999999999999999});
+ CheckInt64(int64_t{-700000000000000000});
+ CheckInt64(LONG_MAX);
+ CheckUInt32(std::numeric_limits<uint32_t>::max());
+ CheckUInt64(uint64_t{1000000000});
+ CheckUInt64(uint64_t{9999999999});
+ CheckUInt64(uint64_t{100000000000000});
+ CheckUInt64(uint64_t{999999999999999});
+ CheckUInt64(uint64_t{1000000000000000000});
+ CheckUInt64(uint64_t{1199999999999999999});
+ CheckUInt64(std::numeric_limits<uint64_t>::max());
+
+ for (int i = 0; i < 10000; i++) {
+ CheckHex64(i);
+ }
+ CheckHex64(uint64_t{0x123456789abcdef0});
+}
+
+template <typename int_type, typename in_val_type>
+void VerifySimpleAtoiGood(in_val_type in_value, int_type exp_value) {
+ std::string s;
+ // (u)int128 can be streamed but not StrCat'd.
+ absl::strings_internal::OStringStream(&s) << in_value;
+ int_type x = static_cast<int_type>(~exp_value);
+ EXPECT_TRUE(SimpleAtoi(s, &x))
+ << "in_value=" << in_value << " s=" << s << " x=" << x;
+ EXPECT_EQ(exp_value, x);
+ x = static_cast<int_type>(~exp_value);
+ EXPECT_TRUE(SimpleAtoi(s.c_str(), &x));
+ EXPECT_EQ(exp_value, x);
+}
+
+template <typename int_type, typename in_val_type>
+void VerifySimpleAtoiBad(in_val_type in_value) {
+ std::string s;
+ // (u)int128 can be streamed but not StrCat'd.
+ absl::strings_internal::OStringStream(&s) << in_value;
+ int_type x;
+ EXPECT_FALSE(SimpleAtoi(s, &x));
+ EXPECT_FALSE(SimpleAtoi(s.c_str(), &x));
+}
+
+TEST(NumbersTest, Atoi) {
+ // SimpleAtoi(absl::string_view, int32_t)
+ VerifySimpleAtoiGood<int32_t>(0, 0);
+ VerifySimpleAtoiGood<int32_t>(42, 42);
+ VerifySimpleAtoiGood<int32_t>(-42, -42);
+
+ VerifySimpleAtoiGood<int32_t>(std::numeric_limits<int32_t>::min(),
+ std::numeric_limits<int32_t>::min());
+ VerifySimpleAtoiGood<int32_t>(std::numeric_limits<int32_t>::max(),
+ std::numeric_limits<int32_t>::max());
+
+ // SimpleAtoi(absl::string_view, uint32_t)
+ VerifySimpleAtoiGood<uint32_t>(0, 0);
+ VerifySimpleAtoiGood<uint32_t>(42, 42);
+ VerifySimpleAtoiBad<uint32_t>(-42);
+
+ VerifySimpleAtoiBad<uint32_t>(std::numeric_limits<int32_t>::min());
+ VerifySimpleAtoiGood<uint32_t>(std::numeric_limits<int32_t>::max(),
+ std::numeric_limits<int32_t>::max());
+ VerifySimpleAtoiGood<uint32_t>(std::numeric_limits<uint32_t>::max(),
+ std::numeric_limits<uint32_t>::max());
+ VerifySimpleAtoiBad<uint32_t>(std::numeric_limits<int64_t>::min());
+ VerifySimpleAtoiBad<uint32_t>(std::numeric_limits<int64_t>::max());
+ VerifySimpleAtoiBad<uint32_t>(std::numeric_limits<uint64_t>::max());
+
+ // SimpleAtoi(absl::string_view, int64_t)
+ VerifySimpleAtoiGood<int64_t>(0, 0);
+ VerifySimpleAtoiGood<int64_t>(42, 42);
+ VerifySimpleAtoiGood<int64_t>(-42, -42);
+
+ VerifySimpleAtoiGood<int64_t>(std::numeric_limits<int32_t>::min(),
+ std::numeric_limits<int32_t>::min());
+ VerifySimpleAtoiGood<int64_t>(std::numeric_limits<int32_t>::max(),
+ std::numeric_limits<int32_t>::max());
+ VerifySimpleAtoiGood<int64_t>(std::numeric_limits<uint32_t>::max(),
+ std::numeric_limits<uint32_t>::max());
+ VerifySimpleAtoiGood<int64_t>(std::numeric_limits<int64_t>::min(),
+ std::numeric_limits<int64_t>::min());
+ VerifySimpleAtoiGood<int64_t>(std::numeric_limits<int64_t>::max(),
+ std::numeric_limits<int64_t>::max());
+ VerifySimpleAtoiBad<int64_t>(std::numeric_limits<uint64_t>::max());
+
+ // SimpleAtoi(absl::string_view, uint64_t)
+ VerifySimpleAtoiGood<uint64_t>(0, 0);
+ VerifySimpleAtoiGood<uint64_t>(42, 42);
+ VerifySimpleAtoiBad<uint64_t>(-42);
+
+ VerifySimpleAtoiBad<uint64_t>(std::numeric_limits<int32_t>::min());
+ VerifySimpleAtoiGood<uint64_t>(std::numeric_limits<int32_t>::max(),
+ std::numeric_limits<int32_t>::max());
+ VerifySimpleAtoiGood<uint64_t>(std::numeric_limits<uint32_t>::max(),
+ std::numeric_limits<uint32_t>::max());
+ VerifySimpleAtoiBad<uint64_t>(std::numeric_limits<int64_t>::min());
+ VerifySimpleAtoiGood<uint64_t>(std::numeric_limits<int64_t>::max(),
+ std::numeric_limits<int64_t>::max());
+ VerifySimpleAtoiGood<uint64_t>(std::numeric_limits<uint64_t>::max(),
+ std::numeric_limits<uint64_t>::max());
+
+ // SimpleAtoi(absl::string_view, absl::uint128)
+ VerifySimpleAtoiGood<absl::uint128>(0, 0);
+ VerifySimpleAtoiGood<absl::uint128>(42, 42);
+ VerifySimpleAtoiBad<absl::uint128>(-42);
+
+ VerifySimpleAtoiBad<absl::uint128>(std::numeric_limits<int32_t>::min());
+ VerifySimpleAtoiGood<absl::uint128>(std::numeric_limits<int32_t>::max(),
+ std::numeric_limits<int32_t>::max());
+ VerifySimpleAtoiGood<absl::uint128>(std::numeric_limits<uint32_t>::max(),
+ std::numeric_limits<uint32_t>::max());
+ VerifySimpleAtoiBad<absl::uint128>(std::numeric_limits<int64_t>::min());
+ VerifySimpleAtoiGood<absl::uint128>(std::numeric_limits<int64_t>::max(),
+ std::numeric_limits<int64_t>::max());
+ VerifySimpleAtoiGood<absl::uint128>(std::numeric_limits<uint64_t>::max(),
+ std::numeric_limits<uint64_t>::max());
+ VerifySimpleAtoiGood<absl::uint128>(
+ std::numeric_limits<absl::uint128>::max(),
+ std::numeric_limits<absl::uint128>::max());
+
+ // SimpleAtoi(absl::string_view, absl::int128)
+ VerifySimpleAtoiGood<absl::int128>(0, 0);
+ VerifySimpleAtoiGood<absl::int128>(42, 42);
+ VerifySimpleAtoiGood<absl::int128>(-42, -42);
+
+ VerifySimpleAtoiGood<absl::int128>(std::numeric_limits<int32_t>::min(),
+ std::numeric_limits<int32_t>::min());
+ VerifySimpleAtoiGood<absl::int128>(std::numeric_limits<int32_t>::max(),
+ std::numeric_limits<int32_t>::max());
+ VerifySimpleAtoiGood<absl::int128>(std::numeric_limits<uint32_t>::max(),
+ std::numeric_limits<uint32_t>::max());
+ VerifySimpleAtoiGood<absl::int128>(std::numeric_limits<int64_t>::min(),
+ std::numeric_limits<int64_t>::min());
+ VerifySimpleAtoiGood<absl::int128>(std::numeric_limits<int64_t>::max(),
+ std::numeric_limits<int64_t>::max());
+ VerifySimpleAtoiGood<absl::int128>(std::numeric_limits<uint64_t>::max(),
+ std::numeric_limits<uint64_t>::max());
+ VerifySimpleAtoiGood<absl::int128>(
+ std::numeric_limits<absl::int128>::min(),
+ std::numeric_limits<absl::int128>::min());
+ VerifySimpleAtoiGood<absl::int128>(
+ std::numeric_limits<absl::int128>::max(),
+ std::numeric_limits<absl::int128>::max());
+ VerifySimpleAtoiBad<absl::int128>(std::numeric_limits<absl::uint128>::max());
+
+ // Some other types
+ VerifySimpleAtoiGood<int>(-42, -42);
+ VerifySimpleAtoiGood<int32_t>(-42, -42);
+ VerifySimpleAtoiGood<uint32_t>(42, 42);
+ VerifySimpleAtoiGood<unsigned int>(42, 42);
+ VerifySimpleAtoiGood<int64_t>(-42, -42);
+ VerifySimpleAtoiGood<long>(-42, -42); // NOLINT(runtime/int)
+ VerifySimpleAtoiGood<uint64_t>(42, 42);
+ VerifySimpleAtoiGood<size_t>(42, 42);
+ VerifySimpleAtoiGood<std::string::size_type>(42, 42);
+}
+
+TEST(NumbersTest, Atod) {
+ double d;
+ EXPECT_TRUE(absl::SimpleAtod("nan", &d));
+ EXPECT_TRUE(std::isnan(d));
+}
+
+TEST(NumbersTest, Atoenum) {
+ enum E01 {
+ E01_zero = 0,
+ E01_one = 1,
+ };
+
+ VerifySimpleAtoiGood<E01>(E01_zero, E01_zero);
+ VerifySimpleAtoiGood<E01>(E01_one, E01_one);
+
+ enum E_101 {
+ E_101_minusone = -1,
+ E_101_zero = 0,
+ E_101_one = 1,
+ };
+
+ VerifySimpleAtoiGood<E_101>(E_101_minusone, E_101_minusone);
+ VerifySimpleAtoiGood<E_101>(E_101_zero, E_101_zero);
+ VerifySimpleAtoiGood<E_101>(E_101_one, E_101_one);
+
+ enum E_bigint {
+ E_bigint_zero = 0,
+ E_bigint_one = 1,
+ E_bigint_max31 = static_cast<int32_t>(0x7FFFFFFF),
+ };
+
+ VerifySimpleAtoiGood<E_bigint>(E_bigint_zero, E_bigint_zero);
+ VerifySimpleAtoiGood<E_bigint>(E_bigint_one, E_bigint_one);
+ VerifySimpleAtoiGood<E_bigint>(E_bigint_max31, E_bigint_max31);
+
+ enum E_fullint {
+ E_fullint_zero = 0,
+ E_fullint_one = 1,
+ E_fullint_max31 = static_cast<int32_t>(0x7FFFFFFF),
+ E_fullint_min32 = INT32_MIN,
+ };
+
+ VerifySimpleAtoiGood<E_fullint>(E_fullint_zero, E_fullint_zero);
+ VerifySimpleAtoiGood<E_fullint>(E_fullint_one, E_fullint_one);
+ VerifySimpleAtoiGood<E_fullint>(E_fullint_max31, E_fullint_max31);
+ VerifySimpleAtoiGood<E_fullint>(E_fullint_min32, E_fullint_min32);
+
+ enum E_biguint {
+ E_biguint_zero = 0,
+ E_biguint_one = 1,
+ E_biguint_max31 = static_cast<uint32_t>(0x7FFFFFFF),
+ E_biguint_max32 = static_cast<uint32_t>(0xFFFFFFFF),
+ };
+
+ VerifySimpleAtoiGood<E_biguint>(E_biguint_zero, E_biguint_zero);
+ VerifySimpleAtoiGood<E_biguint>(E_biguint_one, E_biguint_one);
+ VerifySimpleAtoiGood<E_biguint>(E_biguint_max31, E_biguint_max31);
+ VerifySimpleAtoiGood<E_biguint>(E_biguint_max32, E_biguint_max32);
+}
+
+TEST(stringtest, safe_strto32_base) {
+ int32_t value;
+ EXPECT_TRUE(safe_strto32_base("0x34234324", &value, 16));
+ EXPECT_EQ(0x34234324, value);
+
+ EXPECT_TRUE(safe_strto32_base("0X34234324", &value, 16));
+ EXPECT_EQ(0x34234324, value);
+
+ EXPECT_TRUE(safe_strto32_base("34234324", &value, 16));
+ EXPECT_EQ(0x34234324, value);
+
+ EXPECT_TRUE(safe_strto32_base("0", &value, 16));
+ EXPECT_EQ(0, value);
+
+ EXPECT_TRUE(safe_strto32_base(" \t\n -0x34234324", &value, 16));
+ EXPECT_EQ(-0x34234324, value);
+
+ EXPECT_TRUE(safe_strto32_base(" \t\n -34234324", &value, 16));
+ EXPECT_EQ(-0x34234324, value);
+
+ EXPECT_TRUE(safe_strto32_base("7654321", &value, 8));
+ EXPECT_EQ(07654321, value);
+
+ EXPECT_TRUE(safe_strto32_base("-01234", &value, 8));
+ EXPECT_EQ(-01234, value);
+
+ EXPECT_FALSE(safe_strto32_base("1834", &value, 8));
+
+ // Autodetect base.
+ EXPECT_TRUE(safe_strto32_base("0", &value, 0));
+ EXPECT_EQ(0, value);
+
+ EXPECT_TRUE(safe_strto32_base("077", &value, 0));
+ EXPECT_EQ(077, value); // Octal interpretation
+
+ // Leading zero indicates octal, but then followed by invalid digit.
+ EXPECT_FALSE(safe_strto32_base("088", &value, 0));
+
+ // Leading 0x indicated hex, but then followed by invalid digit.
+ EXPECT_FALSE(safe_strto32_base("0xG", &value, 0));
+
+ // Base-10 version.
+ EXPECT_TRUE(safe_strto32_base("34234324", &value, 10));
+ EXPECT_EQ(34234324, value);
+
+ EXPECT_TRUE(safe_strto32_base("0", &value, 10));
+ EXPECT_EQ(0, value);
+
+ EXPECT_TRUE(safe_strto32_base(" \t\n -34234324", &value, 10));
+ EXPECT_EQ(-34234324, value);
+
+ EXPECT_TRUE(safe_strto32_base("34234324 \n\t ", &value, 10));
+ EXPECT_EQ(34234324, value);
+
+ // Invalid ints.
+ EXPECT_FALSE(safe_strto32_base("", &value, 10));
+ EXPECT_FALSE(safe_strto32_base(" ", &value, 10));
+ EXPECT_FALSE(safe_strto32_base("abc", &value, 10));
+ EXPECT_FALSE(safe_strto32_base("34234324a", &value, 10));
+ EXPECT_FALSE(safe_strto32_base("34234.3", &value, 10));
+
+ // Out of bounds.
+ EXPECT_FALSE(safe_strto32_base("2147483648", &value, 10));
+ EXPECT_FALSE(safe_strto32_base("-2147483649", &value, 10));
+
+ // String version.
+ EXPECT_TRUE(safe_strto32_base(std::string("0x1234"), &value, 16));
+ EXPECT_EQ(0x1234, value);
+
+ // Base-10 string version.
+ EXPECT_TRUE(safe_strto32_base("1234", &value, 10));
+ EXPECT_EQ(1234, value);
+}
+
+TEST(stringtest, safe_strto32_range) {
+ // These tests verify underflow/overflow behaviour.
+ int32_t value;
+ EXPECT_FALSE(safe_strto32_base("2147483648", &value, 10));
+ EXPECT_EQ(std::numeric_limits<int32_t>::max(), value);
+
+ EXPECT_TRUE(safe_strto32_base("-2147483648", &value, 10));
+ EXPECT_EQ(std::numeric_limits<int32_t>::min(), value);
+
+ EXPECT_FALSE(safe_strto32_base("-2147483649", &value, 10));
+ EXPECT_EQ(std::numeric_limits<int32_t>::min(), value);
+}
+
+TEST(stringtest, safe_strto64_range) {
+ // These tests verify underflow/overflow behaviour.
+ int64_t value;
+ EXPECT_FALSE(safe_strto64_base("9223372036854775808", &value, 10));
+ EXPECT_EQ(std::numeric_limits<int64_t>::max(), value);
+
+ EXPECT_TRUE(safe_strto64_base("-9223372036854775808", &value, 10));
+ EXPECT_EQ(std::numeric_limits<int64_t>::min(), value);
+
+ EXPECT_FALSE(safe_strto64_base("-9223372036854775809", &value, 10));
+ EXPECT_EQ(std::numeric_limits<int64_t>::min(), value);
+}
+
+TEST(stringtest, safe_strto32_leading_substring) {
+ // These tests verify this comment in numbers.h:
+ // On error, returns false, and sets *value to: [...]
+ // conversion of leading substring if available ("123@@@" -> 123)
+ // 0 if no leading substring available
+ int32_t value;
+ EXPECT_FALSE(safe_strto32_base("04069@@@", &value, 10));
+ EXPECT_EQ(4069, value);
+
+ EXPECT_FALSE(safe_strto32_base("04069@@@", &value, 8));
+ EXPECT_EQ(0406, value);
+
+ EXPECT_FALSE(safe_strto32_base("04069balloons", &value, 10));
+ EXPECT_EQ(4069, value);
+
+ EXPECT_FALSE(safe_strto32_base("04069balloons", &value, 16));
+ EXPECT_EQ(0x4069ba, value);
+
+ EXPECT_FALSE(safe_strto32_base("@@@", &value, 10));
+ EXPECT_EQ(0, value); // there was no leading substring
+}
+
+TEST(stringtest, safe_strto64_leading_substring) {
+ // These tests verify this comment in numbers.h:
+ // On error, returns false, and sets *value to: [...]
+ // conversion of leading substring if available ("123@@@" -> 123)
+ // 0 if no leading substring available
+ int64_t value;
+ EXPECT_FALSE(safe_strto64_base("04069@@@", &value, 10));
+ EXPECT_EQ(4069, value);
+
+ EXPECT_FALSE(safe_strto64_base("04069@@@", &value, 8));
+ EXPECT_EQ(0406, value);
+
+ EXPECT_FALSE(safe_strto64_base("04069balloons", &value, 10));
+ EXPECT_EQ(4069, value);
+
+ EXPECT_FALSE(safe_strto64_base("04069balloons", &value, 16));
+ EXPECT_EQ(0x4069ba, value);
+
+ EXPECT_FALSE(safe_strto64_base("@@@", &value, 10));
+ EXPECT_EQ(0, value); // there was no leading substring
+}
+
+TEST(stringtest, safe_strto64_base) {
+ int64_t value;
+ EXPECT_TRUE(safe_strto64_base("0x3423432448783446", &value, 16));
+ EXPECT_EQ(int64_t{0x3423432448783446}, value);
+
+ EXPECT_TRUE(safe_strto64_base("3423432448783446", &value, 16));
+ EXPECT_EQ(int64_t{0x3423432448783446}, value);
+
+ EXPECT_TRUE(safe_strto64_base("0", &value, 16));
+ EXPECT_EQ(0, value);
+
+ EXPECT_TRUE(safe_strto64_base(" \t\n -0x3423432448783446", &value, 16));
+ EXPECT_EQ(int64_t{-0x3423432448783446}, value);
+
+ EXPECT_TRUE(safe_strto64_base(" \t\n -3423432448783446", &value, 16));
+ EXPECT_EQ(int64_t{-0x3423432448783446}, value);
+
+ EXPECT_TRUE(safe_strto64_base("123456701234567012", &value, 8));
+ EXPECT_EQ(int64_t{0123456701234567012}, value);
+
+ EXPECT_TRUE(safe_strto64_base("-017777777777777", &value, 8));
+ EXPECT_EQ(int64_t{-017777777777777}, value);
+
+ EXPECT_FALSE(safe_strto64_base("19777777777777", &value, 8));
+
+ // Autodetect base.
+ EXPECT_TRUE(safe_strto64_base("0", &value, 0));
+ EXPECT_EQ(0, value);
+
+ EXPECT_TRUE(safe_strto64_base("077", &value, 0));
+ EXPECT_EQ(077, value); // Octal interpretation
+
+ // Leading zero indicates octal, but then followed by invalid digit.
+ EXPECT_FALSE(safe_strto64_base("088", &value, 0));
+
+ // Leading 0x indicated hex, but then followed by invalid digit.
+ EXPECT_FALSE(safe_strto64_base("0xG", &value, 0));
+
+ // Base-10 version.
+ EXPECT_TRUE(safe_strto64_base("34234324487834466", &value, 10));
+ EXPECT_EQ(int64_t{34234324487834466}, value);
+
+ EXPECT_TRUE(safe_strto64_base("0", &value, 10));
+ EXPECT_EQ(0, value);
+
+ EXPECT_TRUE(safe_strto64_base(" \t\n -34234324487834466", &value, 10));
+ EXPECT_EQ(int64_t{-34234324487834466}, value);
+
+ EXPECT_TRUE(safe_strto64_base("34234324487834466 \n\t ", &value, 10));
+ EXPECT_EQ(int64_t{34234324487834466}, value);
+
+ // Invalid ints.
+ EXPECT_FALSE(safe_strto64_base("", &value, 10));
+ EXPECT_FALSE(safe_strto64_base(" ", &value, 10));
+ EXPECT_FALSE(safe_strto64_base("abc", &value, 10));
+ EXPECT_FALSE(safe_strto64_base("34234324487834466a", &value, 10));
+ EXPECT_FALSE(safe_strto64_base("34234487834466.3", &value, 10));
+
+ // Out of bounds.
+ EXPECT_FALSE(safe_strto64_base("9223372036854775808", &value, 10));
+ EXPECT_FALSE(safe_strto64_base("-9223372036854775809", &value, 10));
+
+ // String version.
+ EXPECT_TRUE(safe_strto64_base(std::string("0x1234"), &value, 16));
+ EXPECT_EQ(0x1234, value);
+
+ // Base-10 string version.
+ EXPECT_TRUE(safe_strto64_base("1234", &value, 10));
+ EXPECT_EQ(1234, value);
+}
+
+const size_t kNumRandomTests = 10000;
+
+template <typename IntType>
+void test_random_integer_parse_base(bool (*parse_func)(absl::string_view,
+ IntType* value,
+ int base)) {
+ using RandomEngine = std::minstd_rand0;
+ std::random_device rd;
+ RandomEngine rng(rd());
+ std::uniform_int_distribution<IntType> random_int(
+ std::numeric_limits<IntType>::min());
+ std::uniform_int_distribution<int> random_base(2, 35);
+ for (size_t i = 0; i < kNumRandomTests; i++) {
+ IntType value = random_int(rng);
+ int base = random_base(rng);
+ std::string str_value;
+ EXPECT_TRUE(Itoa<IntType>(value, base, &str_value));
+ IntType parsed_value;
+
+ // Test successful parse
+ EXPECT_TRUE(parse_func(str_value, &parsed_value, base));
+ EXPECT_EQ(parsed_value, value);
+
+ // Test overflow
+ EXPECT_FALSE(
+ parse_func(absl::StrCat(std::numeric_limits<IntType>::max(), value),
+ &parsed_value, base));
+
+ // Test underflow
+ if (std::numeric_limits<IntType>::min() < 0) {
+ EXPECT_FALSE(
+ parse_func(absl::StrCat(std::numeric_limits<IntType>::min(), value),
+ &parsed_value, base));
+ } else {
+ EXPECT_FALSE(parse_func(absl::StrCat("-", value), &parsed_value, base));
+ }
+ }
+}
+
+TEST(stringtest, safe_strto32_random) {
+ test_random_integer_parse_base<int32_t>(&safe_strto32_base);
+}
+TEST(stringtest, safe_strto64_random) {
+ test_random_integer_parse_base<int64_t>(&safe_strto64_base);
+}
+TEST(stringtest, safe_strtou32_random) {
+ test_random_integer_parse_base<uint32_t>(&safe_strtou32_base);
+}
+TEST(stringtest, safe_strtou64_random) {
+ test_random_integer_parse_base<uint64_t>(&safe_strtou64_base);
+}
+TEST(stringtest, safe_strtou128_random) {
+ // random number generators don't work for uint128, and
+ // uint128 can be streamed but not StrCat'd, so this code must be custom
+ // implemented for uint128, but is generally the same as what's above.
+ // test_random_integer_parse_base<absl::uint128>(
+ // &absl::numbers_internal::safe_strtou128_base);
+ using RandomEngine = std::minstd_rand0;
+ using IntType = absl::uint128;
+ constexpr auto parse_func = &absl::numbers_internal::safe_strtou128_base;
+
+ std::random_device rd;
+ RandomEngine rng(rd());
+ std::uniform_int_distribution<uint64_t> random_uint64(
+ std::numeric_limits<uint64_t>::min());
+ std::uniform_int_distribution<int> random_base(2, 35);
+
+ for (size_t i = 0; i < kNumRandomTests; i++) {
+ IntType value = random_uint64(rng);
+ value = (value << 64) + random_uint64(rng);
+ int base = random_base(rng);
+ std::string str_value;
+ EXPECT_TRUE(Itoa<IntType>(value, base, &str_value));
+ IntType parsed_value;
+
+ // Test successful parse
+ EXPECT_TRUE(parse_func(str_value, &parsed_value, base));
+ EXPECT_EQ(parsed_value, value);
+
+ // Test overflow
+ std::string s;
+ absl::strings_internal::OStringStream(&s)
+ << std::numeric_limits<IntType>::max() << value;
+ EXPECT_FALSE(parse_func(s, &parsed_value, base));
+
+ // Test underflow
+ s.clear();
+ absl::strings_internal::OStringStream(&s) << "-" << value;
+ EXPECT_FALSE(parse_func(s, &parsed_value, base));
+ }
+}
+TEST(stringtest, safe_strto128_random) {
+ // random number generators don't work for int128, and
+ // int128 can be streamed but not StrCat'd, so this code must be custom
+ // implemented for int128, but is generally the same as what's above.
+ // test_random_integer_parse_base<absl::int128>(
+ // &absl::numbers_internal::safe_strto128_base);
+ using RandomEngine = std::minstd_rand0;
+ using IntType = absl::int128;
+ constexpr auto parse_func = &absl::numbers_internal::safe_strto128_base;
+
+ std::random_device rd;
+ RandomEngine rng(rd());
+ std::uniform_int_distribution<int64_t> random_int64(
+ std::numeric_limits<int64_t>::min());
+ std::uniform_int_distribution<uint64_t> random_uint64(
+ std::numeric_limits<uint64_t>::min());
+ std::uniform_int_distribution<int> random_base(2, 35);
+
+ for (size_t i = 0; i < kNumRandomTests; ++i) {
+ int64_t high = random_int64(rng);
+ uint64_t low = random_uint64(rng);
+ IntType value = absl::MakeInt128(high, low);
+
+ int base = random_base(rng);
+ std::string str_value;
+ EXPECT_TRUE(Itoa<IntType>(value, base, &str_value));
+ IntType parsed_value;
+
+ // Test successful parse
+ EXPECT_TRUE(parse_func(str_value, &parsed_value, base));
+ EXPECT_EQ(parsed_value, value);
+
+ // Test overflow
+ std::string s;
+ absl::strings_internal::OStringStream(&s)
+ << std::numeric_limits<IntType>::max() << value;
+ EXPECT_FALSE(parse_func(s, &parsed_value, base));
+
+ // Test underflow
+ s.clear();
+ absl::strings_internal::OStringStream(&s)
+ << std::numeric_limits<IntType>::min() << value;
+ EXPECT_FALSE(parse_func(s, &parsed_value, base));
+ }
+}
+
+TEST(stringtest, safe_strtou32_base) {
+ for (int i = 0; strtouint32_test_cases()[i].str != nullptr; ++i) {
+ const auto& e = strtouint32_test_cases()[i];
+ uint32_t value;
+ EXPECT_EQ(e.expect_ok, safe_strtou32_base(e.str, &value, e.base))
+ << "str=\"" << e.str << "\" base=" << e.base;
+ if (e.expect_ok) {
+ EXPECT_EQ(e.expected, value) << "i=" << i << " str=\"" << e.str
+ << "\" base=" << e.base;
+ }
+ }
+}
+
+TEST(stringtest, safe_strtou32_base_length_delimited) {
+ for (int i = 0; strtouint32_test_cases()[i].str != nullptr; ++i) {
+ const auto& e = strtouint32_test_cases()[i];
+ std::string tmp(e.str);
+ tmp.append("12"); // Adds garbage at the end.
+
+ uint32_t value;
+ EXPECT_EQ(e.expect_ok,
+ safe_strtou32_base(absl::string_view(tmp.data(), strlen(e.str)),
+ &value, e.base))
+ << "str=\"" << e.str << "\" base=" << e.base;
+ if (e.expect_ok) {
+ EXPECT_EQ(e.expected, value) << "i=" << i << " str=" << e.str
+ << " base=" << e.base;
+ }
+ }
+}
+
+TEST(stringtest, safe_strtou64_base) {
+ for (int i = 0; strtouint64_test_cases()[i].str != nullptr; ++i) {
+ const auto& e = strtouint64_test_cases()[i];
+ uint64_t value;
+ EXPECT_EQ(e.expect_ok, safe_strtou64_base(e.str, &value, e.base))
+ << "str=\"" << e.str << "\" base=" << e.base;
+ if (e.expect_ok) {
+ EXPECT_EQ(e.expected, value) << "str=" << e.str << " base=" << e.base;
+ }
+ }
+}
+
+TEST(stringtest, safe_strtou64_base_length_delimited) {
+ for (int i = 0; strtouint64_test_cases()[i].str != nullptr; ++i) {
+ const auto& e = strtouint64_test_cases()[i];
+ std::string tmp(e.str);
+ tmp.append("12"); // Adds garbage at the end.
+
+ uint64_t value;
+ EXPECT_EQ(e.expect_ok,
+ safe_strtou64_base(absl::string_view(tmp.data(), strlen(e.str)),
+ &value, e.base))
+ << "str=\"" << e.str << "\" base=" << e.base;
+ if (e.expect_ok) {
+ EXPECT_EQ(e.expected, value) << "str=\"" << e.str << "\" base=" << e.base;
+ }
+ }
+}
+
+// feenableexcept() and fedisableexcept() are extensions supported by some libc
+// implementations.
+#if defined(__GLIBC__) || defined(__BIONIC__)
+#define ABSL_HAVE_FEENABLEEXCEPT 1
+#define ABSL_HAVE_FEDISABLEEXCEPT 1
+#endif
+
+class SimpleDtoaTest : public testing::Test {
+ protected:
+ void SetUp() override {
+ // Store the current floating point env & clear away any pending exceptions.
+ feholdexcept(&fp_env_);
+#ifdef ABSL_HAVE_FEENABLEEXCEPT
+ // Turn on floating point exceptions.
+ feenableexcept(FE_DIVBYZERO | FE_INVALID | FE_OVERFLOW);
+#endif
+ }
+
+ void TearDown() override {
+ // Restore the floating point environment to the original state.
+ // In theory fedisableexcept is unnecessary; fesetenv will also do it.
+ // In practice, our toolchains have subtle bugs.
+#ifdef ABSL_HAVE_FEDISABLEEXCEPT
+ fedisableexcept(FE_DIVBYZERO | FE_INVALID | FE_OVERFLOW);
+#endif
+ fesetenv(&fp_env_);
+ }
+
+ std::string ToNineDigits(double value) {
+ char buffer[16]; // more than enough for %.9g
+ snprintf(buffer, sizeof(buffer), "%.9g", value);
+ return buffer;
+ }
+
+ fenv_t fp_env_;
+};
+
+// Run the given runnable functor for "cases" test cases, chosen over the
+// available range of float. pi and e and 1/e are seeded, and then all
+// available integer powers of 2 and 10 are multiplied against them. In
+// addition to trying all those values, we try the next higher and next lower
+// float, and then we add additional test cases evenly distributed between them.
+// Each test case is passed to runnable as both a positive and negative value.
+template <typename R>
+void ExhaustiveFloat(uint32_t cases, R&& runnable) {
+ runnable(0.0f);
+ runnable(-0.0f);
+ if (cases >= 2e9) { // more than 2 billion? Might as well run them all.
+ for (float f = 0; f < std::numeric_limits<float>::max(); ) {
+ f = nextafterf(f, std::numeric_limits<float>::max());
+ runnable(-f);
+ runnable(f);
+ }
+ return;
+ }
+ std::set<float> floats = {3.4028234e38f};
+ for (float f : {1.0, 3.14159265, 2.718281828, 1 / 2.718281828}) {
+ for (float testf = f; testf != 0; testf *= 0.1f) floats.insert(testf);
+ for (float testf = f; testf != 0; testf *= 0.5f) floats.insert(testf);
+ for (float testf = f; testf < 3e38f / 2; testf *= 2.0f)
+ floats.insert(testf);
+ for (float testf = f; testf < 3e38f / 10; testf *= 10) floats.insert(testf);
+ }
+
+ float last = *floats.begin();
+
+ runnable(last);
+ runnable(-last);
+ int iters_per_float = cases / floats.size();
+ if (iters_per_float == 0) iters_per_float = 1;
+ for (float f : floats) {
+ if (f == last) continue;
+ float testf = std::nextafter(last, std::numeric_limits<float>::max());
+ runnable(testf);
+ runnable(-testf);
+ last = testf;
+ if (f == last) continue;
+ double step = (double{f} - last) / iters_per_float;
+ for (double d = last + step; d < f; d += step) {
+ testf = d;
+ if (testf != last) {
+ runnable(testf);
+ runnable(-testf);
+ last = testf;
+ }
+ }
+ testf = std::nextafter(f, 0.0f);
+ if (testf > last) {
+ runnable(testf);
+ runnable(-testf);
+ last = testf;
+ }
+ if (f != last) {
+ runnable(f);
+ runnable(-f);
+ last = f;
+ }
+ }
+}
+
+TEST_F(SimpleDtoaTest, ExhaustiveDoubleToSixDigits) {
+ uint64_t test_count = 0;
+ std::vector<double> mismatches;
+ auto checker = [&](double d) {
+ if (d != d) return; // rule out NaNs
+ ++test_count;
+ char sixdigitsbuf[kSixDigitsToBufferSize] = {0};
+ SixDigitsToBuffer(d, sixdigitsbuf);
+ char snprintfbuf[kSixDigitsToBufferSize] = {0};
+ snprintf(snprintfbuf, kSixDigitsToBufferSize, "%g", d);
+ if (strcmp(sixdigitsbuf, snprintfbuf) != 0) {
+ mismatches.push_back(d);
+ if (mismatches.size() < 10) {
+ ABSL_RAW_LOG(ERROR, "%s",
+ absl::StrCat("Six-digit failure with double. ", "d=", d,
+ "=", d, " sixdigits=", sixdigitsbuf,
+ " printf(%g)=", snprintfbuf)
+ .c_str());
+ }
+ }
+ };
+ // Some quick sanity checks...
+ checker(5e-324);
+ checker(1e-308);
+ checker(1.0);
+ checker(1.000005);
+ checker(1.7976931348623157e308);
+ checker(0.00390625);
+#ifndef _MSC_VER
+ // on MSVC, snprintf() rounds it to 0.00195313. SixDigitsToBuffer() rounds it
+ // to 0.00195312 (round half to even).
+ checker(0.001953125);
+#endif
+ checker(0.005859375);
+ // Some cases where the rounding is very very close
+ checker(1.089095e-15);
+ checker(3.274195e-55);
+ checker(6.534355e-146);
+ checker(2.920845e+234);
+
+ if (mismatches.empty()) {
+ test_count = 0;
+ ExhaustiveFloat(kFloatNumCases, checker);
+
+ test_count = 0;
+ std::vector<int> digit_testcases{
+ 100000, 100001, 100002, 100005, 100010, 100020, 100050, 100100, // misc
+ 195312, 195313, // 1.953125 is a case where we round down, just barely.
+ 200000, 500000, 800000, // misc mid-range cases
+ 585937, 585938, // 5.859375 is a case where we round up, just barely.
+ 900000, 990000, 999000, 999900, 999990, 999996, 999997, 999998, 999999};
+ if (kFloatNumCases >= 1e9) {
+ // If at least 1 billion test cases were requested, user wants an
+ // exhaustive test. So let's test all mantissas, too.
+ constexpr int min_mantissa = 100000, max_mantissa = 999999;
+ digit_testcases.resize(max_mantissa - min_mantissa + 1);
+ std::iota(digit_testcases.begin(), digit_testcases.end(), min_mantissa);
+ }
+
+ for (int exponent = -324; exponent <= 308; ++exponent) {
+ double powten = absl::strings_internal::Pow10(exponent);
+ if (powten == 0) powten = 5e-324;
+ if (kFloatNumCases >= 1e9) {
+ // The exhaustive test takes a very long time, so log progress.
+ char buf[kSixDigitsToBufferSize];
+ ABSL_RAW_LOG(
+ INFO, "%s",
+ absl::StrCat("Exp ", exponent, " powten=", powten, "(", powten,
+ ") (",
+ std::string(buf, SixDigitsToBuffer(powten, buf)), ")")
+ .c_str());
+ }
+ for (int digits : digit_testcases) {
+ if (exponent == 308 && digits >= 179769) break; // don't overflow!
+ double digiform = (digits + 0.5) * 0.00001;
+ double testval = digiform * powten;
+ double pretestval = nextafter(testval, 0);
+ double posttestval = nextafter(testval, 1.7976931348623157e308);
+ checker(testval);
+ checker(pretestval);
+ checker(posttestval);
+ }
+ }
+ } else {
+ EXPECT_EQ(mismatches.size(), 0);
+ for (size_t i = 0; i < mismatches.size(); ++i) {
+ if (i > 100) i = mismatches.size() - 1;
+ double d = mismatches[i];
+ char sixdigitsbuf[kSixDigitsToBufferSize] = {0};
+ SixDigitsToBuffer(d, sixdigitsbuf);
+ char snprintfbuf[kSixDigitsToBufferSize] = {0};
+ snprintf(snprintfbuf, kSixDigitsToBufferSize, "%g", d);
+ double before = nextafter(d, 0.0);
+ double after = nextafter(d, 1.7976931348623157e308);
+ char b1[32], b2[kSixDigitsToBufferSize];
+ ABSL_RAW_LOG(
+ ERROR, "%s",
+ absl::StrCat(
+ "Mismatch #", i, " d=", d, " (", ToNineDigits(d), ")",
+ " sixdigits='", sixdigitsbuf, "'", " snprintf='", snprintfbuf,
+ "'", " Before.=", PerfectDtoa(before), " ",
+ (SixDigitsToBuffer(before, b2), b2),
+ " vs snprintf=", (snprintf(b1, sizeof(b1), "%g", before), b1),
+ " Perfect=", PerfectDtoa(d), " ", (SixDigitsToBuffer(d, b2), b2),
+ " vs snprintf=", (snprintf(b1, sizeof(b1), "%g", d), b1),
+ " After.=.", PerfectDtoa(after), " ",
+ (SixDigitsToBuffer(after, b2), b2),
+ " vs snprintf=", (snprintf(b1, sizeof(b1), "%g", after), b1))
+ .c_str());
+ }
+ }
+}
+
+TEST(StrToInt32, Partial) {
+ struct Int32TestLine {
+ std::string input;
+ bool status;
+ int32_t value;
+ };
+ const int32_t int32_min = std::numeric_limits<int32_t>::min();
+ const int32_t int32_max = std::numeric_limits<int32_t>::max();
+ Int32TestLine int32_test_line[] = {
+ {"", false, 0},
+ {" ", false, 0},
+ {"-", false, 0},
+ {"123@@@", false, 123},
+ {absl::StrCat(int32_min, int32_max), false, int32_min},
+ {absl::StrCat(int32_max, int32_max), false, int32_max},
+ };
+
+ for (const Int32TestLine& test_line : int32_test_line) {
+ int32_t value = -2;
+ bool status = safe_strto32_base(test_line.input, &value, 10);
+ EXPECT_EQ(test_line.status, status) << test_line.input;
+ EXPECT_EQ(test_line.value, value) << test_line.input;
+ value = -2;
+ status = safe_strto32_base(test_line.input, &value, 10);
+ EXPECT_EQ(test_line.status, status) << test_line.input;
+ EXPECT_EQ(test_line.value, value) << test_line.input;
+ value = -2;
+ status = safe_strto32_base(absl::string_view(test_line.input), &value, 10);
+ EXPECT_EQ(test_line.status, status) << test_line.input;
+ EXPECT_EQ(test_line.value, value) << test_line.input;
+ }
+}
+
+TEST(StrToUint32, Partial) {
+ struct Uint32TestLine {
+ std::string input;
+ bool status;
+ uint32_t value;
+ };
+ const uint32_t uint32_max = std::numeric_limits<uint32_t>::max();
+ Uint32TestLine uint32_test_line[] = {
+ {"", false, 0},
+ {" ", false, 0},
+ {"-", false, 0},
+ {"123@@@", false, 123},
+ {absl::StrCat(uint32_max, uint32_max), false, uint32_max},
+ };
+
+ for (const Uint32TestLine& test_line : uint32_test_line) {
+ uint32_t value = 2;
+ bool status = safe_strtou32_base(test_line.input, &value, 10);
+ EXPECT_EQ(test_line.status, status) << test_line.input;
+ EXPECT_EQ(test_line.value, value) << test_line.input;
+ value = 2;
+ status = safe_strtou32_base(test_line.input, &value, 10);
+ EXPECT_EQ(test_line.status, status) << test_line.input;
+ EXPECT_EQ(test_line.value, value) << test_line.input;
+ value = 2;
+ status = safe_strtou32_base(absl::string_view(test_line.input), &value, 10);
+ EXPECT_EQ(test_line.status, status) << test_line.input;
+ EXPECT_EQ(test_line.value, value) << test_line.input;
+ }
+}
+
+TEST(StrToInt64, Partial) {
+ struct Int64TestLine {
+ std::string input;
+ bool status;
+ int64_t value;
+ };
+ const int64_t int64_min = std::numeric_limits<int64_t>::min();
+ const int64_t int64_max = std::numeric_limits<int64_t>::max();
+ Int64TestLine int64_test_line[] = {
+ {"", false, 0},
+ {" ", false, 0},
+ {"-", false, 0},
+ {"123@@@", false, 123},
+ {absl::StrCat(int64_min, int64_max), false, int64_min},
+ {absl::StrCat(int64_max, int64_max), false, int64_max},
+ };
+
+ for (const Int64TestLine& test_line : int64_test_line) {
+ int64_t value = -2;
+ bool status = safe_strto64_base(test_line.input, &value, 10);
+ EXPECT_EQ(test_line.status, status) << test_line.input;
+ EXPECT_EQ(test_line.value, value) << test_line.input;
+ value = -2;
+ status = safe_strto64_base(test_line.input, &value, 10);
+ EXPECT_EQ(test_line.status, status) << test_line.input;
+ EXPECT_EQ(test_line.value, value) << test_line.input;
+ value = -2;
+ status = safe_strto64_base(absl::string_view(test_line.input), &value, 10);
+ EXPECT_EQ(test_line.status, status) << test_line.input;
+ EXPECT_EQ(test_line.value, value) << test_line.input;
+ }
+}
+
+TEST(StrToUint64, Partial) {
+ struct Uint64TestLine {
+ std::string input;
+ bool status;
+ uint64_t value;
+ };
+ const uint64_t uint64_max = std::numeric_limits<uint64_t>::max();
+ Uint64TestLine uint64_test_line[] = {
+ {"", false, 0},
+ {" ", false, 0},
+ {"-", false, 0},
+ {"123@@@", false, 123},
+ {absl::StrCat(uint64_max, uint64_max), false, uint64_max},
+ };
+
+ for (const Uint64TestLine& test_line : uint64_test_line) {
+ uint64_t value = 2;
+ bool status = safe_strtou64_base(test_line.input, &value, 10);
+ EXPECT_EQ(test_line.status, status) << test_line.input;
+ EXPECT_EQ(test_line.value, value) << test_line.input;
+ value = 2;
+ status = safe_strtou64_base(test_line.input, &value, 10);
+ EXPECT_EQ(test_line.status, status) << test_line.input;
+ EXPECT_EQ(test_line.value, value) << test_line.input;
+ value = 2;
+ status = safe_strtou64_base(absl::string_view(test_line.input), &value, 10);
+ EXPECT_EQ(test_line.status, status) << test_line.input;
+ EXPECT_EQ(test_line.value, value) << test_line.input;
+ }
+}
+
+TEST(StrToInt32Base, PrefixOnly) {
+ struct Int32TestLine {
+ std::string input;
+ bool status;
+ int32_t value;
+ };
+ Int32TestLine int32_test_line[] = {
+ { "", false, 0 },
+ { "-", false, 0 },
+ { "-0", true, 0 },
+ { "0", true, 0 },
+ { "0x", false, 0 },
+ { "-0x", false, 0 },
+ };
+ const int base_array[] = { 0, 2, 8, 10, 16 };
+
+ for (const Int32TestLine& line : int32_test_line) {
+ for (const int base : base_array) {
+ int32_t value = 2;
+ bool status = safe_strto32_base(line.input.c_str(), &value, base);
+ EXPECT_EQ(line.status, status) << line.input << " " << base;
+ EXPECT_EQ(line.value, value) << line.input << " " << base;
+ value = 2;
+ status = safe_strto32_base(line.input, &value, base);
+ EXPECT_EQ(line.status, status) << line.input << " " << base;
+ EXPECT_EQ(line.value, value) << line.input << " " << base;
+ value = 2;
+ status = safe_strto32_base(absl::string_view(line.input), &value, base);
+ EXPECT_EQ(line.status, status) << line.input << " " << base;
+ EXPECT_EQ(line.value, value) << line.input << " " << base;
+ }
+ }
+}
+
+TEST(StrToUint32Base, PrefixOnly) {
+ struct Uint32TestLine {
+ std::string input;
+ bool status;
+ uint32_t value;
+ };
+ Uint32TestLine uint32_test_line[] = {
+ { "", false, 0 },
+ { "0", true, 0 },
+ { "0x", false, 0 },
+ };
+ const int base_array[] = { 0, 2, 8, 10, 16 };
+
+ for (const Uint32TestLine& line : uint32_test_line) {
+ for (const int base : base_array) {
+ uint32_t value = 2;
+ bool status = safe_strtou32_base(line.input.c_str(), &value, base);
+ EXPECT_EQ(line.status, status) << line.input << " " << base;
+ EXPECT_EQ(line.value, value) << line.input << " " << base;
+ value = 2;
+ status = safe_strtou32_base(line.input, &value, base);
+ EXPECT_EQ(line.status, status) << line.input << " " << base;
+ EXPECT_EQ(line.value, value) << line.input << " " << base;
+ value = 2;
+ status = safe_strtou32_base(absl::string_view(line.input), &value, base);
+ EXPECT_EQ(line.status, status) << line.input << " " << base;
+ EXPECT_EQ(line.value, value) << line.input << " " << base;
+ }
+ }
+}
+
+TEST(StrToInt64Base, PrefixOnly) {
+ struct Int64TestLine {
+ std::string input;
+ bool status;
+ int64_t value;
+ };
+ Int64TestLine int64_test_line[] = {
+ { "", false, 0 },
+ { "-", false, 0 },
+ { "-0", true, 0 },
+ { "0", true, 0 },
+ { "0x", false, 0 },
+ { "-0x", false, 0 },
+ };
+ const int base_array[] = { 0, 2, 8, 10, 16 };
+
+ for (const Int64TestLine& line : int64_test_line) {
+ for (const int base : base_array) {
+ int64_t value = 2;
+ bool status = safe_strto64_base(line.input.c_str(), &value, base);
+ EXPECT_EQ(line.status, status) << line.input << " " << base;
+ EXPECT_EQ(line.value, value) << line.input << " " << base;
+ value = 2;
+ status = safe_strto64_base(line.input, &value, base);
+ EXPECT_EQ(line.status, status) << line.input << " " << base;
+ EXPECT_EQ(line.value, value) << line.input << " " << base;
+ value = 2;
+ status = safe_strto64_base(absl::string_view(line.input), &value, base);
+ EXPECT_EQ(line.status, status) << line.input << " " << base;
+ EXPECT_EQ(line.value, value) << line.input << " " << base;
+ }
+ }
+}
+
+TEST(StrToUint64Base, PrefixOnly) {
+ struct Uint64TestLine {
+ std::string input;
+ bool status;
+ uint64_t value;
+ };
+ Uint64TestLine uint64_test_line[] = {
+ { "", false, 0 },
+ { "0", true, 0 },
+ { "0x", false, 0 },
+ };
+ const int base_array[] = { 0, 2, 8, 10, 16 };
+
+ for (const Uint64TestLine& line : uint64_test_line) {
+ for (const int base : base_array) {
+ uint64_t value = 2;
+ bool status = safe_strtou64_base(line.input.c_str(), &value, base);
+ EXPECT_EQ(line.status, status) << line.input << " " << base;
+ EXPECT_EQ(line.value, value) << line.input << " " << base;
+ value = 2;
+ status = safe_strtou64_base(line.input, &value, base);
+ EXPECT_EQ(line.status, status) << line.input << " " << base;
+ EXPECT_EQ(line.value, value) << line.input << " " << base;
+ value = 2;
+ status = safe_strtou64_base(absl::string_view(line.input), &value, base);
+ EXPECT_EQ(line.status, status) << line.input << " " << base;
+ EXPECT_EQ(line.value, value) << line.input << " " << base;
+ }
+ }
+}
+
+void TestFastHexToBufferZeroPad16(uint64_t v) {
+ char buf[16];
+ auto digits = absl::numbers_internal::FastHexToBufferZeroPad16(v, buf);
+ absl::string_view res(buf, 16);
+ char buf2[17];
+ snprintf(buf2, sizeof(buf2), "%016" PRIx64, v);
+ EXPECT_EQ(res, buf2) << v;
+ size_t expected_digits = snprintf(buf2, sizeof(buf2), "%" PRIx64, v);
+ EXPECT_EQ(digits, expected_digits) << v;
+}
+
+TEST(FastHexToBufferZeroPad16, Smoke) {
+ TestFastHexToBufferZeroPad16(std::numeric_limits<uint64_t>::min());
+ TestFastHexToBufferZeroPad16(std::numeric_limits<uint64_t>::max());
+ TestFastHexToBufferZeroPad16(std::numeric_limits<int64_t>::min());
+ TestFastHexToBufferZeroPad16(std::numeric_limits<int64_t>::max());
+ absl::BitGen rng;
+ for (int i = 0; i < 100000; ++i) {
+ TestFastHexToBufferZeroPad16(
+ absl::LogUniform(rng, std::numeric_limits<uint64_t>::min(),
+ std::numeric_limits<uint64_t>::max()));
+ }
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/strings/str_cat.cc b/third_party/abseil/src/absl/strings/str_cat.cc
new file mode 100644
index 0000000..dd5d25b
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/str_cat.cc
@@ -0,0 +1,246 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/strings/str_cat.h"
+
+#include <assert.h>
+
+#include <algorithm>
+#include <cstdint>
+#include <cstring>
+
+#include "absl/strings/ascii.h"
+#include "absl/strings/internal/resize_uninitialized.h"
+#include "absl/strings/numbers.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+AlphaNum::AlphaNum(Hex hex) {
+ static_assert(numbers_internal::kFastToBufferSize >= 32,
+ "This function only works when output buffer >= 32 bytes long");
+ char* const end = &digits_[numbers_internal::kFastToBufferSize];
+ auto real_width =
+ absl::numbers_internal::FastHexToBufferZeroPad16(hex.value, end - 16);
+ if (real_width >= hex.width) {
+ piece_ = absl::string_view(end - real_width, real_width);
+ } else {
+ // Pad first 16 chars because FastHexToBufferZeroPad16 pads only to 16 and
+ // max pad width can be up to 20.
+ std::memset(end - 32, hex.fill, 16);
+ // Patch up everything else up to the real_width.
+ std::memset(end - real_width - 16, hex.fill, 16);
+ piece_ = absl::string_view(end - hex.width, hex.width);
+ }
+}
+
+AlphaNum::AlphaNum(Dec dec) {
+ assert(dec.width <= numbers_internal::kFastToBufferSize);
+ char* const end = &digits_[numbers_internal::kFastToBufferSize];
+ char* const minfill = end - dec.width;
+ char* writer = end;
+ uint64_t value = dec.value;
+ bool neg = dec.neg;
+ while (value > 9) {
+ *--writer = '0' + (value % 10);
+ value /= 10;
+ }
+ *--writer = '0' + value;
+ if (neg) *--writer = '-';
+
+ ptrdiff_t fillers = writer - minfill;
+ if (fillers > 0) {
+ // Tricky: if the fill character is ' ', then it's <fill><+/-><digits>
+ // But...: if the fill character is '0', then it's <+/-><fill><digits>
+ bool add_sign_again = false;
+ if (neg && dec.fill == '0') { // If filling with '0',
+ ++writer; // ignore the sign we just added
+ add_sign_again = true; // and re-add the sign later.
+ }
+ writer -= fillers;
+ std::fill_n(writer, fillers, dec.fill);
+ if (add_sign_again) *--writer = '-';
+ }
+
+ piece_ = absl::string_view(writer, end - writer);
+}
+
+// ----------------------------------------------------------------------
+// StrCat()
+// This merges the given strings or integers, with no delimiter. This
+// is designed to be the fastest possible way to construct a string out
+// of a mix of raw C strings, string_views, strings, and integer values.
+// ----------------------------------------------------------------------
+
+// Append is merely a version of memcpy that returns the address of the byte
+// after the area just overwritten.
+static char* Append(char* out, const AlphaNum& x) {
+ // memcpy is allowed to overwrite arbitrary memory, so doing this after the
+ // call would force an extra fetch of x.size().
+ char* after = out + x.size();
+ if (x.size() != 0) {
+ memcpy(out, x.data(), x.size());
+ }
+ return after;
+}
+
+std::string StrCat(const AlphaNum& a, const AlphaNum& b) {
+ std::string result;
+ absl::strings_internal::STLStringResizeUninitialized(&result,
+ a.size() + b.size());
+ char* const begin = &result[0];
+ char* out = begin;
+ out = Append(out, a);
+ out = Append(out, b);
+ assert(out == begin + result.size());
+ return result;
+}
+
+std::string StrCat(const AlphaNum& a, const AlphaNum& b, const AlphaNum& c) {
+ std::string result;
+ strings_internal::STLStringResizeUninitialized(
+ &result, a.size() + b.size() + c.size());
+ char* const begin = &result[0];
+ char* out = begin;
+ out = Append(out, a);
+ out = Append(out, b);
+ out = Append(out, c);
+ assert(out == begin + result.size());
+ return result;
+}
+
+std::string StrCat(const AlphaNum& a, const AlphaNum& b, const AlphaNum& c,
+ const AlphaNum& d) {
+ std::string result;
+ strings_internal::STLStringResizeUninitialized(
+ &result, a.size() + b.size() + c.size() + d.size());
+ char* const begin = &result[0];
+ char* out = begin;
+ out = Append(out, a);
+ out = Append(out, b);
+ out = Append(out, c);
+ out = Append(out, d);
+ assert(out == begin + result.size());
+ return result;
+}
+
+namespace strings_internal {
+
+// Do not call directly - these are not part of the public API.
+std::string CatPieces(std::initializer_list<absl::string_view> pieces) {
+ std::string result;
+ size_t total_size = 0;
+ for (const absl::string_view& piece : pieces) total_size += piece.size();
+ strings_internal::STLStringResizeUninitialized(&result, total_size);
+
+ char* const begin = &result[0];
+ char* out = begin;
+ for (const absl::string_view& piece : pieces) {
+ const size_t this_size = piece.size();
+ if (this_size != 0) {
+ memcpy(out, piece.data(), this_size);
+ out += this_size;
+ }
+ }
+ assert(out == begin + result.size());
+ return result;
+}
+
+// It's possible to call StrAppend with an absl::string_view that is itself a
+// fragment of the string we're appending to. However the results of this are
+// random. Therefore, check for this in debug mode. Use unsigned math so we
+// only have to do one comparison. Note, there's an exception case: appending an
+// empty string is always allowed.
+#define ASSERT_NO_OVERLAP(dest, src) \
+ assert(((src).size() == 0) || \
+ (uintptr_t((src).data() - (dest).data()) > uintptr_t((dest).size())))
+
+void AppendPieces(std::string* dest,
+ std::initializer_list<absl::string_view> pieces) {
+ size_t old_size = dest->size();
+ size_t total_size = old_size;
+ for (const absl::string_view& piece : pieces) {
+ ASSERT_NO_OVERLAP(*dest, piece);
+ total_size += piece.size();
+ }
+ strings_internal::STLStringResizeUninitialized(dest, total_size);
+
+ char* const begin = &(*dest)[0];
+ char* out = begin + old_size;
+ for (const absl::string_view& piece : pieces) {
+ const size_t this_size = piece.size();
+ if (this_size != 0) {
+ memcpy(out, piece.data(), this_size);
+ out += this_size;
+ }
+ }
+ assert(out == begin + dest->size());
+}
+
+} // namespace strings_internal
+
+void StrAppend(std::string* dest, const AlphaNum& a) {
+ ASSERT_NO_OVERLAP(*dest, a);
+ dest->append(a.data(), a.size());
+}
+
+void StrAppend(std::string* dest, const AlphaNum& a, const AlphaNum& b) {
+ ASSERT_NO_OVERLAP(*dest, a);
+ ASSERT_NO_OVERLAP(*dest, b);
+ std::string::size_type old_size = dest->size();
+ strings_internal::STLStringResizeUninitialized(
+ dest, old_size + a.size() + b.size());
+ char* const begin = &(*dest)[0];
+ char* out = begin + old_size;
+ out = Append(out, a);
+ out = Append(out, b);
+ assert(out == begin + dest->size());
+}
+
+void StrAppend(std::string* dest, const AlphaNum& a, const AlphaNum& b,
+ const AlphaNum& c) {
+ ASSERT_NO_OVERLAP(*dest, a);
+ ASSERT_NO_OVERLAP(*dest, b);
+ ASSERT_NO_OVERLAP(*dest, c);
+ std::string::size_type old_size = dest->size();
+ strings_internal::STLStringResizeUninitialized(
+ dest, old_size + a.size() + b.size() + c.size());
+ char* const begin = &(*dest)[0];
+ char* out = begin + old_size;
+ out = Append(out, a);
+ out = Append(out, b);
+ out = Append(out, c);
+ assert(out == begin + dest->size());
+}
+
+void StrAppend(std::string* dest, const AlphaNum& a, const AlphaNum& b,
+ const AlphaNum& c, const AlphaNum& d) {
+ ASSERT_NO_OVERLAP(*dest, a);
+ ASSERT_NO_OVERLAP(*dest, b);
+ ASSERT_NO_OVERLAP(*dest, c);
+ ASSERT_NO_OVERLAP(*dest, d);
+ std::string::size_type old_size = dest->size();
+ strings_internal::STLStringResizeUninitialized(
+ dest, old_size + a.size() + b.size() + c.size() + d.size());
+ char* const begin = &(*dest)[0];
+ char* out = begin + old_size;
+ out = Append(out, a);
+ out = Append(out, b);
+ out = Append(out, c);
+ out = Append(out, d);
+ assert(out == begin + dest->size());
+}
+
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/strings/str_cat.h b/third_party/abseil/src/absl/strings/str_cat.h
new file mode 100644
index 0000000..a8a85c7
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/str_cat.h
@@ -0,0 +1,408 @@
+//
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: str_cat.h
+// -----------------------------------------------------------------------------
+//
+// This package contains functions for efficiently concatenating and appending
+// strings: `StrCat()` and `StrAppend()`. Most of the work within these routines
+// is actually handled through use of a special AlphaNum type, which was
+// designed to be used as a parameter type that efficiently manages conversion
+// to strings and avoids copies in the above operations.
+//
+// Any routine accepting either a string or a number may accept `AlphaNum`.
+// The basic idea is that by accepting a `const AlphaNum &` as an argument
+// to your function, your callers will automagically convert bools, integers,
+// and floating point values to strings for you.
+//
+// NOTE: Use of `AlphaNum` outside of the //absl/strings package is unsupported
+// except for the specific case of function parameters of type `AlphaNum` or
+// `const AlphaNum &`. In particular, instantiating `AlphaNum` directly as a
+// stack variable is not supported.
+//
+// Conversion from 8-bit values is not accepted because, if it were, then an
+// attempt to pass ':' instead of ":" might result in a 58 ending up in your
+// result.
+//
+// Bools convert to "0" or "1". Pointers to types other than `char *` are not
+// valid inputs. No output is generated for null `char *` pointers.
+//
+// Floating point numbers are formatted with six-digit precision, which is
+// the default for "std::cout <<" or printf "%g" (the same as "%.6g").
+//
+// You can convert to hexadecimal output rather than decimal output using the
+// `Hex` type contained here. To do so, pass `Hex(my_int)` as a parameter to
+// `StrCat()` or `StrAppend()`. You may specify a minimum hex field width using
+// a `PadSpec` enum.
+//
+// -----------------------------------------------------------------------------
+
+#ifndef ABSL_STRINGS_STR_CAT_H_
+#define ABSL_STRINGS_STR_CAT_H_
+
+#include <array>
+#include <cstdint>
+#include <string>
+#include <type_traits>
+#include <vector>
+
+#include "absl/base/port.h"
+#include "absl/strings/numbers.h"
+#include "absl/strings/string_view.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+namespace strings_internal {
+// AlphaNumBuffer allows a way to pass a string to StrCat without having to do
+// memory allocation. It is simply a pair of a fixed-size character array, and
+// a size. Please don't use outside of absl, yet.
+template <size_t max_size>
+struct AlphaNumBuffer {
+ std::array<char, max_size> data;
+ size_t size;
+};
+
+} // namespace strings_internal
+
+// Enum that specifies the number of significant digits to return in a `Hex` or
+// `Dec` conversion and fill character to use. A `kZeroPad2` value, for example,
+// would produce hexadecimal strings such as "0a","0f" and a 'kSpacePad5' value
+// would produce hexadecimal strings such as " a"," f".
+enum PadSpec : uint8_t {
+ kNoPad = 1,
+ kZeroPad2,
+ kZeroPad3,
+ kZeroPad4,
+ kZeroPad5,
+ kZeroPad6,
+ kZeroPad7,
+ kZeroPad8,
+ kZeroPad9,
+ kZeroPad10,
+ kZeroPad11,
+ kZeroPad12,
+ kZeroPad13,
+ kZeroPad14,
+ kZeroPad15,
+ kZeroPad16,
+ kZeroPad17,
+ kZeroPad18,
+ kZeroPad19,
+ kZeroPad20,
+
+ kSpacePad2 = kZeroPad2 + 64,
+ kSpacePad3,
+ kSpacePad4,
+ kSpacePad5,
+ kSpacePad6,
+ kSpacePad7,
+ kSpacePad8,
+ kSpacePad9,
+ kSpacePad10,
+ kSpacePad11,
+ kSpacePad12,
+ kSpacePad13,
+ kSpacePad14,
+ kSpacePad15,
+ kSpacePad16,
+ kSpacePad17,
+ kSpacePad18,
+ kSpacePad19,
+ kSpacePad20,
+};
+
+// -----------------------------------------------------------------------------
+// Hex
+// -----------------------------------------------------------------------------
+//
+// `Hex` stores a set of hexadecimal string conversion parameters for use
+// within `AlphaNum` string conversions.
+struct Hex {
+ uint64_t value;
+ uint8_t width;
+ char fill;
+
+ template <typename Int>
+ explicit Hex(
+ Int v, PadSpec spec = absl::kNoPad,
+ typename std::enable_if<sizeof(Int) == 1 &&
+ !std::is_pointer<Int>::value>::type* = nullptr)
+ : Hex(spec, static_cast<uint8_t>(v)) {}
+ template <typename Int>
+ explicit Hex(
+ Int v, PadSpec spec = absl::kNoPad,
+ typename std::enable_if<sizeof(Int) == 2 &&
+ !std::is_pointer<Int>::value>::type* = nullptr)
+ : Hex(spec, static_cast<uint16_t>(v)) {}
+ template <typename Int>
+ explicit Hex(
+ Int v, PadSpec spec = absl::kNoPad,
+ typename std::enable_if<sizeof(Int) == 4 &&
+ !std::is_pointer<Int>::value>::type* = nullptr)
+ : Hex(spec, static_cast<uint32_t>(v)) {}
+ template <typename Int>
+ explicit Hex(
+ Int v, PadSpec spec = absl::kNoPad,
+ typename std::enable_if<sizeof(Int) == 8 &&
+ !std::is_pointer<Int>::value>::type* = nullptr)
+ : Hex(spec, static_cast<uint64_t>(v)) {}
+ template <typename Pointee>
+ explicit Hex(Pointee* v, PadSpec spec = absl::kNoPad)
+ : Hex(spec, reinterpret_cast<uintptr_t>(v)) {}
+
+ private:
+ Hex(PadSpec spec, uint64_t v)
+ : value(v),
+ width(spec == absl::kNoPad
+ ? 1
+ : spec >= absl::kSpacePad2 ? spec - absl::kSpacePad2 + 2
+ : spec - absl::kZeroPad2 + 2),
+ fill(spec >= absl::kSpacePad2 ? ' ' : '0') {}
+};
+
+// -----------------------------------------------------------------------------
+// Dec
+// -----------------------------------------------------------------------------
+//
+// `Dec` stores a set of decimal string conversion parameters for use
+// within `AlphaNum` string conversions. Dec is slower than the default
+// integer conversion, so use it only if you need padding.
+struct Dec {
+ uint64_t value;
+ uint8_t width;
+ char fill;
+ bool neg;
+
+ template <typename Int>
+ explicit Dec(Int v, PadSpec spec = absl::kNoPad,
+ typename std::enable_if<(sizeof(Int) <= 8)>::type* = nullptr)
+ : value(v >= 0 ? static_cast<uint64_t>(v)
+ : uint64_t{0} - static_cast<uint64_t>(v)),
+ width(spec == absl::kNoPad
+ ? 1
+ : spec >= absl::kSpacePad2 ? spec - absl::kSpacePad2 + 2
+ : spec - absl::kZeroPad2 + 2),
+ fill(spec >= absl::kSpacePad2 ? ' ' : '0'),
+ neg(v < 0) {}
+};
+
+// -----------------------------------------------------------------------------
+// AlphaNum
+// -----------------------------------------------------------------------------
+//
+// The `AlphaNum` class acts as the main parameter type for `StrCat()` and
+// `StrAppend()`, providing efficient conversion of numeric, boolean, and
+// hexadecimal values (through the `Hex` type) into strings.
+
+class AlphaNum {
+ public:
+ // No bool ctor -- bools convert to an integral type.
+ // A bool ctor would also convert incoming pointers (bletch).
+
+ AlphaNum(int x) // NOLINT(runtime/explicit)
+ : piece_(digits_,
+ numbers_internal::FastIntToBuffer(x, digits_) - &digits_[0]) {}
+ AlphaNum(unsigned int x) // NOLINT(runtime/explicit)
+ : piece_(digits_,
+ numbers_internal::FastIntToBuffer(x, digits_) - &digits_[0]) {}
+ AlphaNum(long x) // NOLINT(*)
+ : piece_(digits_,
+ numbers_internal::FastIntToBuffer(x, digits_) - &digits_[0]) {}
+ AlphaNum(unsigned long x) // NOLINT(*)
+ : piece_(digits_,
+ numbers_internal::FastIntToBuffer(x, digits_) - &digits_[0]) {}
+ AlphaNum(long long x) // NOLINT(*)
+ : piece_(digits_,
+ numbers_internal::FastIntToBuffer(x, digits_) - &digits_[0]) {}
+ AlphaNum(unsigned long long x) // NOLINT(*)
+ : piece_(digits_,
+ numbers_internal::FastIntToBuffer(x, digits_) - &digits_[0]) {}
+
+ AlphaNum(float f) // NOLINT(runtime/explicit)
+ : piece_(digits_, numbers_internal::SixDigitsToBuffer(f, digits_)) {}
+ AlphaNum(double f) // NOLINT(runtime/explicit)
+ : piece_(digits_, numbers_internal::SixDigitsToBuffer(f, digits_)) {}
+
+ AlphaNum(Hex hex); // NOLINT(runtime/explicit)
+ AlphaNum(Dec dec); // NOLINT(runtime/explicit)
+
+ template <size_t size>
+ AlphaNum( // NOLINT(runtime/explicit)
+ const strings_internal::AlphaNumBuffer<size>& buf)
+ : piece_(&buf.data[0], buf.size) {}
+
+ AlphaNum(const char* c_str) : piece_(c_str) {} // NOLINT(runtime/explicit)
+ AlphaNum(absl::string_view pc) : piece_(pc) {} // NOLINT(runtime/explicit)
+
+ template <typename Allocator>
+ AlphaNum( // NOLINT(runtime/explicit)
+ const std::basic_string<char, std::char_traits<char>, Allocator>& str)
+ : piece_(str) {}
+
+ // Use string literals ":" instead of character literals ':'.
+ AlphaNum(char c) = delete; // NOLINT(runtime/explicit)
+
+ AlphaNum(const AlphaNum&) = delete;
+ AlphaNum& operator=(const AlphaNum&) = delete;
+
+ absl::string_view::size_type size() const { return piece_.size(); }
+ const char* data() const { return piece_.data(); }
+ absl::string_view Piece() const { return piece_; }
+
+ // Normal enums are already handled by the integer formatters.
+ // This overload matches only scoped enums.
+ template <typename T,
+ typename = typename std::enable_if<
+ std::is_enum<T>{} && !std::is_convertible<T, int>{}>::type>
+ AlphaNum(T e) // NOLINT(runtime/explicit)
+ : AlphaNum(static_cast<typename std::underlying_type<T>::type>(e)) {}
+
+ // vector<bool>::reference and const_reference require special help to
+ // convert to `AlphaNum` because it requires two user defined conversions.
+ template <
+ typename T,
+ typename std::enable_if<
+ std::is_class<T>::value &&
+ (std::is_same<T, std::vector<bool>::reference>::value ||
+ std::is_same<T, std::vector<bool>::const_reference>::value)>::type* =
+ nullptr>
+ AlphaNum(T e) : AlphaNum(static_cast<bool>(e)) {} // NOLINT(runtime/explicit)
+
+ private:
+ absl::string_view piece_;
+ char digits_[numbers_internal::kFastToBufferSize];
+};
+
+// -----------------------------------------------------------------------------
+// StrCat()
+// -----------------------------------------------------------------------------
+//
+// Merges given strings or numbers, using no delimiter(s), returning the merged
+// result as a string.
+//
+// `StrCat()` is designed to be the fastest possible way to construct a string
+// out of a mix of raw C strings, string_views, strings, bool values,
+// and numeric values.
+//
+// Don't use `StrCat()` for user-visible strings. The localization process
+// works poorly on strings built up out of fragments.
+//
+// For clarity and performance, don't use `StrCat()` when appending to a
+// string. Use `StrAppend()` instead. In particular, avoid using any of these
+// (anti-)patterns:
+//
+// str.append(StrCat(...))
+// str += StrCat(...)
+// str = StrCat(str, ...)
+//
+// The last case is the worst, with a potential to change a loop
+// from a linear time operation with O(1) dynamic allocations into a
+// quadratic time operation with O(n) dynamic allocations.
+//
+// See `StrAppend()` below for more information.
+
+namespace strings_internal {
+
+// Do not call directly - this is not part of the public API.
+std::string CatPieces(std::initializer_list<absl::string_view> pieces);
+void AppendPieces(std::string* dest,
+ std::initializer_list<absl::string_view> pieces);
+
+} // namespace strings_internal
+
+ABSL_MUST_USE_RESULT inline std::string StrCat() { return std::string(); }
+
+ABSL_MUST_USE_RESULT inline std::string StrCat(const AlphaNum& a) {
+ return std::string(a.data(), a.size());
+}
+
+ABSL_MUST_USE_RESULT std::string StrCat(const AlphaNum& a, const AlphaNum& b);
+ABSL_MUST_USE_RESULT std::string StrCat(const AlphaNum& a, const AlphaNum& b,
+ const AlphaNum& c);
+ABSL_MUST_USE_RESULT std::string StrCat(const AlphaNum& a, const AlphaNum& b,
+ const AlphaNum& c, const AlphaNum& d);
+
+// Support 5 or more arguments
+template <typename... AV>
+ABSL_MUST_USE_RESULT inline std::string StrCat(
+ const AlphaNum& a, const AlphaNum& b, const AlphaNum& c, const AlphaNum& d,
+ const AlphaNum& e, const AV&... args) {
+ return strings_internal::CatPieces(
+ {a.Piece(), b.Piece(), c.Piece(), d.Piece(), e.Piece(),
+ static_cast<const AlphaNum&>(args).Piece()...});
+}
+
+// -----------------------------------------------------------------------------
+// StrAppend()
+// -----------------------------------------------------------------------------
+//
+// Appends a string or set of strings to an existing string, in a similar
+// fashion to `StrCat()`.
+//
+// WARNING: `StrAppend(&str, a, b, c, ...)` requires that none of the
+// a, b, c, parameters be a reference into str. For speed, `StrAppend()` does
+// not try to check each of its input arguments to be sure that they are not
+// a subset of the string being appended to. That is, while this will work:
+//
+// std::string s = "foo";
+// s += s;
+//
+// This output is undefined:
+//
+// std::string s = "foo";
+// StrAppend(&s, s);
+//
+// This output is undefined as well, since `absl::string_view` does not own its
+// data:
+//
+// std::string s = "foobar";
+// absl::string_view p = s;
+// StrAppend(&s, p);
+
+inline void StrAppend(std::string*) {}
+void StrAppend(std::string* dest, const AlphaNum& a);
+void StrAppend(std::string* dest, const AlphaNum& a, const AlphaNum& b);
+void StrAppend(std::string* dest, const AlphaNum& a, const AlphaNum& b,
+ const AlphaNum& c);
+void StrAppend(std::string* dest, const AlphaNum& a, const AlphaNum& b,
+ const AlphaNum& c, const AlphaNum& d);
+
+// Support 5 or more arguments
+template <typename... AV>
+inline void StrAppend(std::string* dest, const AlphaNum& a, const AlphaNum& b,
+ const AlphaNum& c, const AlphaNum& d, const AlphaNum& e,
+ const AV&... args) {
+ strings_internal::AppendPieces(
+ dest, {a.Piece(), b.Piece(), c.Piece(), d.Piece(), e.Piece(),
+ static_cast<const AlphaNum&>(args).Piece()...});
+}
+
+// Helper function for the future StrCat default floating-point format, %.6g
+// This is fast.
+inline strings_internal::AlphaNumBuffer<
+ numbers_internal::kSixDigitsToBufferSize>
+SixDigits(double d) {
+ strings_internal::AlphaNumBuffer<numbers_internal::kSixDigitsToBufferSize>
+ result;
+ result.size = numbers_internal::SixDigitsToBuffer(d, &result.data[0]);
+ return result;
+}
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_STRINGS_STR_CAT_H_
diff --git a/third_party/abseil/src/absl/strings/str_cat_benchmark.cc b/third_party/abseil/src/absl/strings/str_cat_benchmark.cc
new file mode 100644
index 0000000..02c4dbe
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/str_cat_benchmark.cc
@@ -0,0 +1,187 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/strings/str_cat.h"
+
+#include <cstdint>
+#include <string>
+
+#include "benchmark/benchmark.h"
+#include "absl/strings/substitute.h"
+
+namespace {
+
+const char kStringOne[] = "Once Upon A Time, ";
+const char kStringTwo[] = "There was a string benchmark";
+
+// We want to include negative numbers in the benchmark, so this function
+// is used to count 0, 1, -1, 2, -2, 3, -3, ...
+inline int IncrementAlternatingSign(int i) {
+ return i > 0 ? -i : 1 - i;
+}
+
+void BM_Sum_By_StrCat(benchmark::State& state) {
+ int i = 0;
+ char foo[100];
+ for (auto _ : state) {
+ // NOLINTNEXTLINE(runtime/printf)
+ strcpy(foo, absl::StrCat(kStringOne, i, kStringTwo, i * 65536ULL).c_str());
+ int sum = 0;
+ for (char* f = &foo[0]; *f != 0; ++f) {
+ sum += *f;
+ }
+ benchmark::DoNotOptimize(sum);
+ i = IncrementAlternatingSign(i);
+ }
+}
+BENCHMARK(BM_Sum_By_StrCat);
+
+void BM_StrCat_By_snprintf(benchmark::State& state) {
+ int i = 0;
+ char on_stack[1000];
+ for (auto _ : state) {
+ snprintf(on_stack, sizeof(on_stack), "%s %s:%d", kStringOne, kStringTwo, i);
+ i = IncrementAlternatingSign(i);
+ }
+}
+BENCHMARK(BM_StrCat_By_snprintf);
+
+void BM_StrCat_By_Strings(benchmark::State& state) {
+ int i = 0;
+ for (auto _ : state) {
+ std::string result =
+ std::string(kStringOne) + " " + kStringTwo + ":" + absl::StrCat(i);
+ benchmark::DoNotOptimize(result);
+ i = IncrementAlternatingSign(i);
+ }
+}
+BENCHMARK(BM_StrCat_By_Strings);
+
+void BM_StrCat_By_StringOpPlus(benchmark::State& state) {
+ int i = 0;
+ for (auto _ : state) {
+ std::string result = kStringOne;
+ result += " ";
+ result += kStringTwo;
+ result += ":";
+ result += absl::StrCat(i);
+ benchmark::DoNotOptimize(result);
+ i = IncrementAlternatingSign(i);
+ }
+}
+BENCHMARK(BM_StrCat_By_StringOpPlus);
+
+void BM_StrCat_By_StrCat(benchmark::State& state) {
+ int i = 0;
+ for (auto _ : state) {
+ std::string result = absl::StrCat(kStringOne, " ", kStringTwo, ":", i);
+ benchmark::DoNotOptimize(result);
+ i = IncrementAlternatingSign(i);
+ }
+}
+BENCHMARK(BM_StrCat_By_StrCat);
+
+void BM_HexCat_By_StrCat(benchmark::State& state) {
+ int i = 0;
+ for (auto _ : state) {
+ std::string result =
+ absl::StrCat(kStringOne, " ", absl::Hex(int64_t{i} + 0x10000000));
+ benchmark::DoNotOptimize(result);
+ i = IncrementAlternatingSign(i);
+ }
+}
+BENCHMARK(BM_HexCat_By_StrCat);
+
+void BM_HexCat_By_Substitute(benchmark::State& state) {
+ int i = 0;
+ for (auto _ : state) {
+ std::string result = absl::Substitute(
+ "$0 $1", kStringOne, reinterpret_cast<void*>(int64_t{i} + 0x10000000));
+ benchmark::DoNotOptimize(result);
+ i = IncrementAlternatingSign(i);
+ }
+}
+BENCHMARK(BM_HexCat_By_Substitute);
+
+void BM_FloatToString_By_StrCat(benchmark::State& state) {
+ int i = 0;
+ float foo = 0.0f;
+ for (auto _ : state) {
+ std::string result = absl::StrCat(foo += 1.001f, " != ", int64_t{i});
+ benchmark::DoNotOptimize(result);
+ i = IncrementAlternatingSign(i);
+ }
+}
+BENCHMARK(BM_FloatToString_By_StrCat);
+
+void BM_DoubleToString_By_SixDigits(benchmark::State& state) {
+ int i = 0;
+ double foo = 0.0;
+ for (auto _ : state) {
+ std::string result =
+ absl::StrCat(absl::SixDigits(foo += 1.001), " != ", int64_t{i});
+ benchmark::DoNotOptimize(result);
+ i = IncrementAlternatingSign(i);
+ }
+}
+BENCHMARK(BM_DoubleToString_By_SixDigits);
+
+template <typename... Chunks>
+void BM_StrAppendImpl(benchmark::State& state, size_t total_bytes,
+ Chunks... chunks) {
+ for (auto s : state) {
+ std::string result;
+ while (result.size() < total_bytes) {
+ absl::StrAppend(&result, chunks...);
+ benchmark::DoNotOptimize(result);
+ }
+ }
+}
+
+void BM_StrAppend(benchmark::State& state) {
+ const int total_bytes = state.range(0);
+ const int chunks_at_a_time = state.range(1);
+ const absl::string_view kChunk = "0123456789";
+
+ switch (chunks_at_a_time) {
+ case 1:
+ return BM_StrAppendImpl(state, total_bytes, kChunk);
+ case 2:
+ return BM_StrAppendImpl(state, total_bytes, kChunk, kChunk);
+ case 4:
+ return BM_StrAppendImpl(state, total_bytes, kChunk, kChunk, kChunk,
+ kChunk);
+ case 8:
+ return BM_StrAppendImpl(state, total_bytes, kChunk, kChunk, kChunk,
+ kChunk, kChunk, kChunk, kChunk, kChunk);
+ default:
+ std::abort();
+ }
+}
+
+template <typename B>
+void StrAppendConfig(B* benchmark) {
+ for (int bytes : {10, 100, 1000, 10000}) {
+ for (int chunks : {1, 2, 4, 8}) {
+ // Only add the ones that divide properly. Otherwise we are over counting.
+ if (bytes % (10 * chunks) == 0) {
+ benchmark->Args({bytes, chunks});
+ }
+ }
+ }
+}
+
+BENCHMARK(BM_StrAppend)->Apply(StrAppendConfig);
+
+} // namespace
diff --git a/third_party/abseil/src/absl/strings/str_cat_test.cc b/third_party/abseil/src/absl/strings/str_cat_test.cc
new file mode 100644
index 0000000..f3770dc
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/str_cat_test.cc
@@ -0,0 +1,610 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Unit tests for all str_cat.h functions
+
+#include "absl/strings/str_cat.h"
+
+#include <cstdint>
+#include <string>
+#include <vector>
+
+#include "gtest/gtest.h"
+#include "absl/strings/substitute.h"
+
+#ifdef __ANDROID__
+// Android assert messages only go to system log, so death tests cannot inspect
+// the message for matching.
+#define ABSL_EXPECT_DEBUG_DEATH(statement, regex) \
+ EXPECT_DEBUG_DEATH(statement, ".*")
+#else
+#define ABSL_EXPECT_DEBUG_DEATH(statement, regex) \
+ EXPECT_DEBUG_DEATH(statement, regex)
+#endif
+
+namespace {
+
+// Test absl::StrCat of ints and longs of various sizes and signdedness.
+TEST(StrCat, Ints) {
+ const short s = -1; // NOLINT(runtime/int)
+ const uint16_t us = 2;
+ const int i = -3;
+ const unsigned int ui = 4;
+ const long l = -5; // NOLINT(runtime/int)
+ const unsigned long ul = 6; // NOLINT(runtime/int)
+ const long long ll = -7; // NOLINT(runtime/int)
+ const unsigned long long ull = 8; // NOLINT(runtime/int)
+ const ptrdiff_t ptrdiff = -9;
+ const size_t size = 10;
+ const intptr_t intptr = -12;
+ const uintptr_t uintptr = 13;
+ std::string answer;
+ answer = absl::StrCat(s, us);
+ EXPECT_EQ(answer, "-12");
+ answer = absl::StrCat(i, ui);
+ EXPECT_EQ(answer, "-34");
+ answer = absl::StrCat(l, ul);
+ EXPECT_EQ(answer, "-56");
+ answer = absl::StrCat(ll, ull);
+ EXPECT_EQ(answer, "-78");
+ answer = absl::StrCat(ptrdiff, size);
+ EXPECT_EQ(answer, "-910");
+ answer = absl::StrCat(ptrdiff, intptr);
+ EXPECT_EQ(answer, "-9-12");
+ answer = absl::StrCat(uintptr, 0);
+ EXPECT_EQ(answer, "130");
+}
+
+TEST(StrCat, Enums) {
+ enum SmallNumbers { One = 1, Ten = 10 } e = Ten;
+ EXPECT_EQ("10", absl::StrCat(e));
+ EXPECT_EQ("-5", absl::StrCat(SmallNumbers(-5)));
+
+ enum class Option { Boxers = 1, Briefs = -1 };
+
+ EXPECT_EQ("-1", absl::StrCat(Option::Briefs));
+
+ enum class Airplane : uint64_t {
+ Airbus = 1,
+ Boeing = 1000,
+ Canary = 10000000000 // too big for "int"
+ };
+
+ EXPECT_EQ("10000000000", absl::StrCat(Airplane::Canary));
+
+ enum class TwoGig : int32_t {
+ TwoToTheZero = 1,
+ TwoToTheSixteenth = 1 << 16,
+ TwoToTheThirtyFirst = INT32_MIN
+ };
+ EXPECT_EQ("65536", absl::StrCat(TwoGig::TwoToTheSixteenth));
+ EXPECT_EQ("-2147483648", absl::StrCat(TwoGig::TwoToTheThirtyFirst));
+ EXPECT_EQ("-1", absl::StrCat(static_cast<TwoGig>(-1)));
+
+ enum class FourGig : uint32_t {
+ TwoToTheZero = 1,
+ TwoToTheSixteenth = 1 << 16,
+ TwoToTheThirtyFirst = 1U << 31 // too big for "int"
+ };
+ EXPECT_EQ("65536", absl::StrCat(FourGig::TwoToTheSixteenth));
+ EXPECT_EQ("2147483648", absl::StrCat(FourGig::TwoToTheThirtyFirst));
+ EXPECT_EQ("4294967295", absl::StrCat(static_cast<FourGig>(-1)));
+
+ EXPECT_EQ("10000000000", absl::StrCat(Airplane::Canary));
+}
+
+TEST(StrCat, Basics) {
+ std::string result;
+
+ std::string strs[] = {"Hello", "Cruel", "World"};
+
+ std::string stdstrs[] = {
+ "std::Hello",
+ "std::Cruel",
+ "std::World"
+ };
+
+ absl::string_view pieces[] = {"Hello", "Cruel", "World"};
+
+ const char* c_strs[] = {
+ "Hello",
+ "Cruel",
+ "World"
+ };
+
+ int32_t i32s[] = {'H', 'C', 'W'};
+ uint64_t ui64s[] = {12345678910LL, 10987654321LL};
+
+ EXPECT_EQ(absl::StrCat(), "");
+
+ result = absl::StrCat(false, true, 2, 3);
+ EXPECT_EQ(result, "0123");
+
+ result = absl::StrCat(-1);
+ EXPECT_EQ(result, "-1");
+
+ result = absl::StrCat(absl::SixDigits(0.5));
+ EXPECT_EQ(result, "0.5");
+
+ result = absl::StrCat(strs[1], pieces[2]);
+ EXPECT_EQ(result, "CruelWorld");
+
+ result = absl::StrCat(stdstrs[1], " ", stdstrs[2]);
+ EXPECT_EQ(result, "std::Cruel std::World");
+
+ result = absl::StrCat(strs[0], ", ", pieces[2]);
+ EXPECT_EQ(result, "Hello, World");
+
+ result = absl::StrCat(strs[0], ", ", strs[1], " ", strs[2], "!");
+ EXPECT_EQ(result, "Hello, Cruel World!");
+
+ result = absl::StrCat(pieces[0], ", ", pieces[1], " ", pieces[2]);
+ EXPECT_EQ(result, "Hello, Cruel World");
+
+ result = absl::StrCat(c_strs[0], ", ", c_strs[1], " ", c_strs[2]);
+ EXPECT_EQ(result, "Hello, Cruel World");
+
+ result = absl::StrCat("ASCII ", i32s[0], ", ", i32s[1], " ", i32s[2], "!");
+ EXPECT_EQ(result, "ASCII 72, 67 87!");
+
+ result = absl::StrCat(ui64s[0], ", ", ui64s[1], "!");
+ EXPECT_EQ(result, "12345678910, 10987654321!");
+
+ std::string one =
+ "1"; // Actually, it's the size of this string that we want; a
+ // 64-bit build distinguishes between size_t and uint64_t,
+ // even though they're both unsigned 64-bit values.
+ result = absl::StrCat("And a ", one.size(), " and a ",
+ &result[2] - &result[0], " and a ", one, " 2 3 4", "!");
+ EXPECT_EQ(result, "And a 1 and a 2 and a 1 2 3 4!");
+
+ // result = absl::StrCat("Single chars won't compile", '!');
+ // result = absl::StrCat("Neither will nullptrs", nullptr);
+ result =
+ absl::StrCat("To output a char by ASCII/numeric value, use +: ", '!' + 0);
+ EXPECT_EQ(result, "To output a char by ASCII/numeric value, use +: 33");
+
+ float f = 100000.5;
+ result = absl::StrCat("A hundred K and a half is ", absl::SixDigits(f));
+ EXPECT_EQ(result, "A hundred K and a half is 100000");
+
+ f = 100001.5;
+ result =
+ absl::StrCat("A hundred K and one and a half is ", absl::SixDigits(f));
+ EXPECT_EQ(result, "A hundred K and one and a half is 100002");
+
+ double d = 100000.5;
+ d *= d;
+ result =
+ absl::StrCat("A hundred K and a half squared is ", absl::SixDigits(d));
+ EXPECT_EQ(result, "A hundred K and a half squared is 1.00001e+10");
+
+ result = absl::StrCat(1, 2, 333, 4444, 55555, 666666, 7777777, 88888888,
+ 999999999);
+ EXPECT_EQ(result, "12333444455555666666777777788888888999999999");
+}
+
+TEST(StrCat, CornerCases) {
+ std::string result;
+
+ result = absl::StrCat(""); // NOLINT
+ EXPECT_EQ(result, "");
+ result = absl::StrCat("", "");
+ EXPECT_EQ(result, "");
+ result = absl::StrCat("", "", "");
+ EXPECT_EQ(result, "");
+ result = absl::StrCat("", "", "", "");
+ EXPECT_EQ(result, "");
+ result = absl::StrCat("", "", "", "", "");
+ EXPECT_EQ(result, "");
+}
+
+// A minimal allocator that uses malloc().
+template <typename T>
+struct Mallocator {
+ typedef T value_type;
+ typedef size_t size_type;
+ typedef ptrdiff_t difference_type;
+ typedef T* pointer;
+ typedef const T* const_pointer;
+ typedef T& reference;
+ typedef const T& const_reference;
+
+ size_type max_size() const {
+ return size_t(std::numeric_limits<size_type>::max()) / sizeof(value_type);
+ }
+ template <typename U>
+ struct rebind {
+ typedef Mallocator<U> other;
+ };
+ Mallocator() = default;
+ template <class U>
+ Mallocator(const Mallocator<U>&) {} // NOLINT(runtime/explicit)
+
+ T* allocate(size_t n) { return static_cast<T*>(std::malloc(n * sizeof(T))); }
+ void deallocate(T* p, size_t) { std::free(p); }
+};
+template <typename T, typename U>
+bool operator==(const Mallocator<T>&, const Mallocator<U>&) {
+ return true;
+}
+template <typename T, typename U>
+bool operator!=(const Mallocator<T>&, const Mallocator<U>&) {
+ return false;
+}
+
+TEST(StrCat, CustomAllocator) {
+ using mstring =
+ std::basic_string<char, std::char_traits<char>, Mallocator<char>>;
+ const mstring str1("PARACHUTE OFF A BLIMP INTO MOSCONE!!");
+
+ const mstring str2("Read this book about coffee tables");
+
+ std::string result = absl::StrCat(str1, str2);
+ EXPECT_EQ(result,
+ "PARACHUTE OFF A BLIMP INTO MOSCONE!!"
+ "Read this book about coffee tables");
+}
+
+TEST(StrCat, MaxArgs) {
+ std::string result;
+ // Test 10 up to 26 arguments, the old maximum
+ result = absl::StrCat(1, 2, 3, 4, 5, 6, 7, 8, 9, "a");
+ EXPECT_EQ(result, "123456789a");
+ result = absl::StrCat(1, 2, 3, 4, 5, 6, 7, 8, 9, "a", "b");
+ EXPECT_EQ(result, "123456789ab");
+ result = absl::StrCat(1, 2, 3, 4, 5, 6, 7, 8, 9, "a", "b", "c");
+ EXPECT_EQ(result, "123456789abc");
+ result = absl::StrCat(1, 2, 3, 4, 5, 6, 7, 8, 9, "a", "b", "c", "d");
+ EXPECT_EQ(result, "123456789abcd");
+ result = absl::StrCat(1, 2, 3, 4, 5, 6, 7, 8, 9, "a", "b", "c", "d", "e");
+ EXPECT_EQ(result, "123456789abcde");
+ result =
+ absl::StrCat(1, 2, 3, 4, 5, 6, 7, 8, 9, "a", "b", "c", "d", "e", "f");
+ EXPECT_EQ(result, "123456789abcdef");
+ result = absl::StrCat(1, 2, 3, 4, 5, 6, 7, 8, 9, "a", "b", "c", "d", "e", "f",
+ "g");
+ EXPECT_EQ(result, "123456789abcdefg");
+ result = absl::StrCat(1, 2, 3, 4, 5, 6, 7, 8, 9, "a", "b", "c", "d", "e", "f",
+ "g", "h");
+ EXPECT_EQ(result, "123456789abcdefgh");
+ result = absl::StrCat(1, 2, 3, 4, 5, 6, 7, 8, 9, "a", "b", "c", "d", "e", "f",
+ "g", "h", "i");
+ EXPECT_EQ(result, "123456789abcdefghi");
+ result = absl::StrCat(1, 2, 3, 4, 5, 6, 7, 8, 9, "a", "b", "c", "d", "e", "f",
+ "g", "h", "i", "j");
+ EXPECT_EQ(result, "123456789abcdefghij");
+ result = absl::StrCat(1, 2, 3, 4, 5, 6, 7, 8, 9, "a", "b", "c", "d", "e", "f",
+ "g", "h", "i", "j", "k");
+ EXPECT_EQ(result, "123456789abcdefghijk");
+ result = absl::StrCat(1, 2, 3, 4, 5, 6, 7, 8, 9, "a", "b", "c", "d", "e", "f",
+ "g", "h", "i", "j", "k", "l");
+ EXPECT_EQ(result, "123456789abcdefghijkl");
+ result = absl::StrCat(1, 2, 3, 4, 5, 6, 7, 8, 9, "a", "b", "c", "d", "e", "f",
+ "g", "h", "i", "j", "k", "l", "m");
+ EXPECT_EQ(result, "123456789abcdefghijklm");
+ result = absl::StrCat(1, 2, 3, 4, 5, 6, 7, 8, 9, "a", "b", "c", "d", "e", "f",
+ "g", "h", "i", "j", "k", "l", "m", "n");
+ EXPECT_EQ(result, "123456789abcdefghijklmn");
+ result = absl::StrCat(1, 2, 3, 4, 5, 6, 7, 8, 9, "a", "b", "c", "d", "e", "f",
+ "g", "h", "i", "j", "k", "l", "m", "n", "o");
+ EXPECT_EQ(result, "123456789abcdefghijklmno");
+ result = absl::StrCat(1, 2, 3, 4, 5, 6, 7, 8, 9, "a", "b", "c", "d", "e", "f",
+ "g", "h", "i", "j", "k", "l", "m", "n", "o", "p");
+ EXPECT_EQ(result, "123456789abcdefghijklmnop");
+ result = absl::StrCat(1, 2, 3, 4, 5, 6, 7, 8, 9, "a", "b", "c", "d", "e", "f",
+ "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q");
+ EXPECT_EQ(result, "123456789abcdefghijklmnopq");
+ // No limit thanks to C++11's variadic templates
+ result = absl::StrCat(
+ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, "a", "b", "c", "d", "e", "f", "g", "h",
+ "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w",
+ "x", "y", "z", "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L",
+ "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z");
+ EXPECT_EQ(result,
+ "12345678910abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ");
+}
+
+TEST(StrAppend, Basics) {
+ std::string result = "existing text";
+
+ std::string strs[] = {"Hello", "Cruel", "World"};
+
+ std::string stdstrs[] = {
+ "std::Hello",
+ "std::Cruel",
+ "std::World"
+ };
+
+ absl::string_view pieces[] = {"Hello", "Cruel", "World"};
+
+ const char* c_strs[] = {
+ "Hello",
+ "Cruel",
+ "World"
+ };
+
+ int32_t i32s[] = {'H', 'C', 'W'};
+ uint64_t ui64s[] = {12345678910LL, 10987654321LL};
+
+ std::string::size_type old_size = result.size();
+ absl::StrAppend(&result);
+ EXPECT_EQ(result.size(), old_size);
+
+ old_size = result.size();
+ absl::StrAppend(&result, strs[0]);
+ EXPECT_EQ(result.substr(old_size), "Hello");
+
+ old_size = result.size();
+ absl::StrAppend(&result, strs[1], pieces[2]);
+ EXPECT_EQ(result.substr(old_size), "CruelWorld");
+
+ old_size = result.size();
+ absl::StrAppend(&result, stdstrs[0], ", ", pieces[2]);
+ EXPECT_EQ(result.substr(old_size), "std::Hello, World");
+
+ old_size = result.size();
+ absl::StrAppend(&result, strs[0], ", ", stdstrs[1], " ", strs[2], "!");
+ EXPECT_EQ(result.substr(old_size), "Hello, std::Cruel World!");
+
+ old_size = result.size();
+ absl::StrAppend(&result, pieces[0], ", ", pieces[1], " ", pieces[2]);
+ EXPECT_EQ(result.substr(old_size), "Hello, Cruel World");
+
+ old_size = result.size();
+ absl::StrAppend(&result, c_strs[0], ", ", c_strs[1], " ", c_strs[2]);
+ EXPECT_EQ(result.substr(old_size), "Hello, Cruel World");
+
+ old_size = result.size();
+ absl::StrAppend(&result, "ASCII ", i32s[0], ", ", i32s[1], " ", i32s[2], "!");
+ EXPECT_EQ(result.substr(old_size), "ASCII 72, 67 87!");
+
+ old_size = result.size();
+ absl::StrAppend(&result, ui64s[0], ", ", ui64s[1], "!");
+ EXPECT_EQ(result.substr(old_size), "12345678910, 10987654321!");
+
+ std::string one =
+ "1"; // Actually, it's the size of this string that we want; a
+ // 64-bit build distinguishes between size_t and uint64_t,
+ // even though they're both unsigned 64-bit values.
+ old_size = result.size();
+ absl::StrAppend(&result, "And a ", one.size(), " and a ",
+ &result[2] - &result[0], " and a ", one, " 2 3 4", "!");
+ EXPECT_EQ(result.substr(old_size), "And a 1 and a 2 and a 1 2 3 4!");
+
+ // result = absl::StrCat("Single chars won't compile", '!');
+ // result = absl::StrCat("Neither will nullptrs", nullptr);
+ old_size = result.size();
+ absl::StrAppend(&result,
+ "To output a char by ASCII/numeric value, use +: ", '!' + 0);
+ EXPECT_EQ(result.substr(old_size),
+ "To output a char by ASCII/numeric value, use +: 33");
+
+ // Test 9 arguments, the old maximum
+ old_size = result.size();
+ absl::StrAppend(&result, 1, 22, 333, 4444, 55555, 666666, 7777777, 88888888,
+ 9);
+ EXPECT_EQ(result.substr(old_size), "1223334444555556666667777777888888889");
+
+ // No limit thanks to C++11's variadic templates
+ old_size = result.size();
+ absl::StrAppend(
+ &result, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, //
+ "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", //
+ "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z", //
+ "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", //
+ "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z", //
+ "No limit thanks to C++11's variadic templates");
+ EXPECT_EQ(result.substr(old_size),
+ "12345678910abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+ "No limit thanks to C++11's variadic templates");
+}
+
+TEST(StrCat, VectorBoolReferenceTypes) {
+ std::vector<bool> v;
+ v.push_back(true);
+ v.push_back(false);
+ std::vector<bool> const& cv = v;
+ // Test that vector<bool>::reference and vector<bool>::const_reference
+ // are handled as if the were really bool types and not the proxy types
+ // they really are.
+ std::string result = absl::StrCat(v[0], v[1], cv[0], cv[1]); // NOLINT
+ EXPECT_EQ(result, "1010");
+}
+
+// Passing nullptr to memcpy is undefined behavior and this test
+// provides coverage of codepaths that handle empty strings with nullptrs.
+TEST(StrCat, AvoidsMemcpyWithNullptr) {
+ EXPECT_EQ(absl::StrCat(42, absl::string_view{}), "42");
+
+ // Cover CatPieces code.
+ EXPECT_EQ(absl::StrCat(1, 2, 3, 4, 5, absl::string_view{}), "12345");
+
+ // Cover AppendPieces.
+ std::string result;
+ absl::StrAppend(&result, 1, 2, 3, 4, 5, absl::string_view{});
+ EXPECT_EQ(result, "12345");
+}
+
+#ifdef GTEST_HAS_DEATH_TEST
+TEST(StrAppend, Death) {
+ std::string s = "self";
+ // on linux it's "assertion", on mac it's "Assertion",
+ // on chromiumos it's "Assertion ... failed".
+ ABSL_EXPECT_DEBUG_DEATH(absl::StrAppend(&s, s.c_str() + 1),
+ "ssertion.*failed");
+ ABSL_EXPECT_DEBUG_DEATH(absl::StrAppend(&s, s), "ssertion.*failed");
+}
+#endif // GTEST_HAS_DEATH_TEST
+
+TEST(StrAppend, CornerCases) {
+ std::string result;
+ absl::StrAppend(&result, "");
+ EXPECT_EQ(result, "");
+ absl::StrAppend(&result, "", "");
+ EXPECT_EQ(result, "");
+ absl::StrAppend(&result, "", "", "");
+ EXPECT_EQ(result, "");
+ absl::StrAppend(&result, "", "", "", "");
+ EXPECT_EQ(result, "");
+ absl::StrAppend(&result, "", "", "", "", "");
+ EXPECT_EQ(result, "");
+}
+
+TEST(StrAppend, CornerCasesNonEmptyAppend) {
+ for (std::string result : {"hello", "a string too long to fit in the SSO"}) {
+ const std::string expected = result;
+ absl::StrAppend(&result, "");
+ EXPECT_EQ(result, expected);
+ absl::StrAppend(&result, "", "");
+ EXPECT_EQ(result, expected);
+ absl::StrAppend(&result, "", "", "");
+ EXPECT_EQ(result, expected);
+ absl::StrAppend(&result, "", "", "", "");
+ EXPECT_EQ(result, expected);
+ absl::StrAppend(&result, "", "", "", "", "");
+ EXPECT_EQ(result, expected);
+ }
+}
+
+template <typename IntType>
+void CheckHex(IntType v, const char* nopad_format, const char* zeropad_format,
+ const char* spacepad_format) {
+ char expected[256];
+
+ std::string actual = absl::StrCat(absl::Hex(v, absl::kNoPad));
+ snprintf(expected, sizeof(expected), nopad_format, v);
+ EXPECT_EQ(expected, actual) << " decimal value " << v;
+
+ for (int spec = absl::kZeroPad2; spec <= absl::kZeroPad20; ++spec) {
+ std::string actual =
+ absl::StrCat(absl::Hex(v, static_cast<absl::PadSpec>(spec)));
+ snprintf(expected, sizeof(expected), zeropad_format,
+ spec - absl::kZeroPad2 + 2, v);
+ EXPECT_EQ(expected, actual) << " decimal value " << v;
+ }
+
+ for (int spec = absl::kSpacePad2; spec <= absl::kSpacePad20; ++spec) {
+ std::string actual =
+ absl::StrCat(absl::Hex(v, static_cast<absl::PadSpec>(spec)));
+ snprintf(expected, sizeof(expected), spacepad_format,
+ spec - absl::kSpacePad2 + 2, v);
+ EXPECT_EQ(expected, actual) << " decimal value " << v;
+ }
+}
+
+template <typename IntType>
+void CheckDec(IntType v, const char* nopad_format, const char* zeropad_format,
+ const char* spacepad_format) {
+ char expected[256];
+
+ std::string actual = absl::StrCat(absl::Dec(v, absl::kNoPad));
+ snprintf(expected, sizeof(expected), nopad_format, v);
+ EXPECT_EQ(expected, actual) << " decimal value " << v;
+
+ for (int spec = absl::kZeroPad2; spec <= absl::kZeroPad20; ++spec) {
+ std::string actual =
+ absl::StrCat(absl::Dec(v, static_cast<absl::PadSpec>(spec)));
+ snprintf(expected, sizeof(expected), zeropad_format,
+ spec - absl::kZeroPad2 + 2, v);
+ EXPECT_EQ(expected, actual)
+ << " decimal value " << v << " format '" << zeropad_format
+ << "' digits " << (spec - absl::kZeroPad2 + 2);
+ }
+
+ for (int spec = absl::kSpacePad2; spec <= absl::kSpacePad20; ++spec) {
+ std::string actual =
+ absl::StrCat(absl::Dec(v, static_cast<absl::PadSpec>(spec)));
+ snprintf(expected, sizeof(expected), spacepad_format,
+ spec - absl::kSpacePad2 + 2, v);
+ EXPECT_EQ(expected, actual)
+ << " decimal value " << v << " format '" << spacepad_format
+ << "' digits " << (spec - absl::kSpacePad2 + 2);
+ }
+}
+
+void CheckHexDec64(uint64_t v) {
+ unsigned long long ullv = v; // NOLINT(runtime/int)
+
+ CheckHex(ullv, "%llx", "%0*llx", "%*llx");
+ CheckDec(ullv, "%llu", "%0*llu", "%*llu");
+
+ long long llv = static_cast<long long>(ullv); // NOLINT(runtime/int)
+ CheckDec(llv, "%lld", "%0*lld", "%*lld");
+
+ if (sizeof(v) == sizeof(&v)) {
+ auto uintptr = static_cast<uintptr_t>(v);
+ void* ptr = reinterpret_cast<void*>(uintptr);
+ CheckHex(ptr, "%llx", "%0*llx", "%*llx");
+ }
+}
+
+void CheckHexDec32(uint32_t uv) {
+ CheckHex(uv, "%x", "%0*x", "%*x");
+ CheckDec(uv, "%u", "%0*u", "%*u");
+ int32_t v = static_cast<int32_t>(uv);
+ CheckDec(v, "%d", "%0*d", "%*d");
+
+ if (sizeof(v) == sizeof(&v)) {
+ auto uintptr = static_cast<uintptr_t>(v);
+ void* ptr = reinterpret_cast<void*>(uintptr);
+ CheckHex(ptr, "%x", "%0*x", "%*x");
+ }
+}
+
+void CheckAll(uint64_t v) {
+ CheckHexDec64(v);
+ CheckHexDec32(static_cast<uint32_t>(v));
+}
+
+void TestFastPrints() {
+ // Test all small ints; there aren't many and they're common.
+ for (int i = 0; i < 10000; i++) {
+ CheckAll(i);
+ }
+
+ CheckAll(std::numeric_limits<uint64_t>::max());
+ CheckAll(std::numeric_limits<uint64_t>::max() - 1);
+ CheckAll(std::numeric_limits<int64_t>::min());
+ CheckAll(std::numeric_limits<int64_t>::min() + 1);
+ CheckAll(std::numeric_limits<uint32_t>::max());
+ CheckAll(std::numeric_limits<uint32_t>::max() - 1);
+ CheckAll(std::numeric_limits<int32_t>::min());
+ CheckAll(std::numeric_limits<int32_t>::min() + 1);
+ CheckAll(999999999); // fits in 32 bits
+ CheckAll(1000000000); // fits in 32 bits
+ CheckAll(9999999999); // doesn't fit in 32 bits
+ CheckAll(10000000000); // doesn't fit in 32 bits
+ CheckAll(999999999999999999); // fits in signed 64-bit
+ CheckAll(9999999999999999999u); // fits in unsigned 64-bit, but not signed.
+ CheckAll(1000000000000000000); // fits in signed 64-bit
+ CheckAll(10000000000000000000u); // fits in unsigned 64-bit, but not signed.
+
+ CheckAll(999999999876543210); // check all decimal digits, signed
+ CheckAll(9999999999876543210u); // check all decimal digits, unsigned.
+ CheckAll(0x123456789abcdef0); // check all hex digits
+ CheckAll(0x12345678);
+
+ int8_t minus_one_8bit = -1;
+ EXPECT_EQ("ff", absl::StrCat(absl::Hex(minus_one_8bit)));
+
+ int16_t minus_one_16bit = -1;
+ EXPECT_EQ("ffff", absl::StrCat(absl::Hex(minus_one_16bit)));
+}
+
+TEST(Numbers, TestFunctionsMovedOverFromNumbersMain) {
+ TestFastPrints();
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/strings/str_format.h b/third_party/abseil/src/absl/strings/str_format.h
new file mode 100644
index 0000000..0146510
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/str_format.h
@@ -0,0 +1,813 @@
+//
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: str_format.h
+// -----------------------------------------------------------------------------
+//
+// The `str_format` library is a typesafe replacement for the family of
+// `printf()` string formatting routines within the `<cstdio>` standard library
+// header. Like the `printf` family, `str_format` uses a "format string" to
+// perform argument substitutions based on types. See the `FormatSpec` section
+// below for format string documentation.
+//
+// Example:
+//
+// std::string s = absl::StrFormat(
+// "%s %s You have $%d!", "Hello", name, dollars);
+//
+// The library consists of the following basic utilities:
+//
+// * `absl::StrFormat()`, a type-safe replacement for `std::sprintf()`, to
+// write a format string to a `string` value.
+// * `absl::StrAppendFormat()` to append a format string to a `string`
+// * `absl::StreamFormat()` to more efficiently write a format string to a
+// stream, such as`std::cout`.
+// * `absl::PrintF()`, `absl::FPrintF()` and `absl::SNPrintF()` as
+// replacements for `std::printf()`, `std::fprintf()` and `std::snprintf()`.
+//
+// Note: a version of `std::sprintf()` is not supported as it is
+// generally unsafe due to buffer overflows.
+//
+// Additionally, you can provide a format string (and its associated arguments)
+// using one of the following abstractions:
+//
+// * A `FormatSpec` class template fully encapsulates a format string and its
+// type arguments and is usually provided to `str_format` functions as a
+// variadic argument of type `FormatSpec<Arg...>`. The `FormatSpec<Args...>`
+// template is evaluated at compile-time, providing type safety.
+// * A `ParsedFormat` instance, which encapsulates a specific, pre-compiled
+// format string for a specific set of type(s), and which can be passed
+// between API boundaries. (The `FormatSpec` type should not be used
+// directly except as an argument type for wrapper functions.)
+//
+// The `str_format` library provides the ability to output its format strings to
+// arbitrary sink types:
+//
+// * A generic `Format()` function to write outputs to arbitrary sink types,
+// which must implement a `FormatRawSink` interface.
+//
+// * A `FormatUntyped()` function that is similar to `Format()` except it is
+// loosely typed. `FormatUntyped()` is not a template and does not perform
+// any compile-time checking of the format string; instead, it returns a
+// boolean from a runtime check.
+//
+// In addition, the `str_format` library provides extension points for
+// augmenting formatting to new types. See "StrFormat Extensions" below.
+
+#ifndef ABSL_STRINGS_STR_FORMAT_H_
+#define ABSL_STRINGS_STR_FORMAT_H_
+
+#include <cstdio>
+#include <string>
+
+#include "absl/strings/internal/str_format/arg.h" // IWYU pragma: export
+#include "absl/strings/internal/str_format/bind.h" // IWYU pragma: export
+#include "absl/strings/internal/str_format/checker.h" // IWYU pragma: export
+#include "absl/strings/internal/str_format/extension.h" // IWYU pragma: export
+#include "absl/strings/internal/str_format/parser.h" // IWYU pragma: export
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+// UntypedFormatSpec
+//
+// A type-erased class that can be used directly within untyped API entry
+// points. An `UntypedFormatSpec` is specifically used as an argument to
+// `FormatUntyped()`.
+//
+// Example:
+//
+// absl::UntypedFormatSpec format("%d");
+// std::string out;
+// CHECK(absl::FormatUntyped(&out, format, {absl::FormatArg(1)}));
+class UntypedFormatSpec {
+ public:
+ UntypedFormatSpec() = delete;
+ UntypedFormatSpec(const UntypedFormatSpec&) = delete;
+ UntypedFormatSpec& operator=(const UntypedFormatSpec&) = delete;
+
+ explicit UntypedFormatSpec(string_view s) : spec_(s) {}
+
+ protected:
+ explicit UntypedFormatSpec(const str_format_internal::ParsedFormatBase* pc)
+ : spec_(pc) {}
+
+ private:
+ friend str_format_internal::UntypedFormatSpecImpl;
+ str_format_internal::UntypedFormatSpecImpl spec_;
+};
+
+// FormatStreamed()
+//
+// Takes a streamable argument and returns an object that can print it
+// with '%s'. Allows printing of types that have an `operator<<` but no
+// intrinsic type support within `StrFormat()` itself.
+//
+// Example:
+//
+// absl::StrFormat("%s", absl::FormatStreamed(obj));
+template <typename T>
+str_format_internal::StreamedWrapper<T> FormatStreamed(const T& v) {
+ return str_format_internal::StreamedWrapper<T>(v);
+}
+
+// FormatCountCapture
+//
+// This class provides a way to safely wrap `StrFormat()` captures of `%n`
+// conversions, which denote the number of characters written by a formatting
+// operation to this point, into an integer value.
+//
+// This wrapper is designed to allow safe usage of `%n` within `StrFormat(); in
+// the `printf()` family of functions, `%n` is not safe to use, as the `int *`
+// buffer can be used to capture arbitrary data.
+//
+// Example:
+//
+// int n = 0;
+// std::string s = absl::StrFormat("%s%d%n", "hello", 123,
+// absl::FormatCountCapture(&n));
+// EXPECT_EQ(8, n);
+class FormatCountCapture {
+ public:
+ explicit FormatCountCapture(int* p) : p_(p) {}
+
+ private:
+ // FormatCountCaptureHelper is used to define FormatConvertImpl() for this
+ // class.
+ friend struct str_format_internal::FormatCountCaptureHelper;
+ // Unused() is here because of the false positive from -Wunused-private-field
+ // p_ is used in the templated function of the friend FormatCountCaptureHelper
+ // class.
+ int* Unused() { return p_; }
+ int* p_;
+};
+
+// FormatSpec
+//
+// The `FormatSpec` type defines the makeup of a format string within the
+// `str_format` library. It is a variadic class template that is evaluated at
+// compile-time, according to the format string and arguments that are passed to
+// it.
+//
+// You should not need to manipulate this type directly. You should only name it
+// if you are writing wrapper functions which accept format arguments that will
+// be provided unmodified to functions in this library. Such a wrapper function
+// might be a class method that provides format arguments and/or internally uses
+// the result of formatting.
+//
+// For a `FormatSpec` to be valid at compile-time, it must be provided as
+// either:
+//
+// * A `constexpr` literal or `absl::string_view`, which is how it most often
+// used.
+// * A `ParsedFormat` instantiation, which ensures the format string is
+// valid before use. (See below.)
+//
+// Example:
+//
+// // Provided as a string literal.
+// absl::StrFormat("Welcome to %s, Number %d!", "The Village", 6);
+//
+// // Provided as a constexpr absl::string_view.
+// constexpr absl::string_view formatString = "Welcome to %s, Number %d!";
+// absl::StrFormat(formatString, "The Village", 6);
+//
+// // Provided as a pre-compiled ParsedFormat object.
+// // Note that this example is useful only for illustration purposes.
+// absl::ParsedFormat<'s', 'd'> formatString("Welcome to %s, Number %d!");
+// absl::StrFormat(formatString, "TheVillage", 6);
+//
+// A format string generally follows the POSIX syntax as used within the POSIX
+// `printf` specification.
+//
+// (See http://pubs.opengroup.org/onlinepubs/9699919799/functions/fprintf.html.)
+//
+// In specific, the `FormatSpec` supports the following type specifiers:
+// * `c` for characters
+// * `s` for strings
+// * `d` or `i` for integers
+// * `o` for unsigned integer conversions into octal
+// * `x` or `X` for unsigned integer conversions into hex
+// * `u` for unsigned integers
+// * `f` or `F` for floating point values into decimal notation
+// * `e` or `E` for floating point values into exponential notation
+// * `a` or `A` for floating point values into hex exponential notation
+// * `g` or `G` for floating point values into decimal or exponential
+// notation based on their precision
+// * `p` for pointer address values
+// * `n` for the special case of writing out the number of characters
+// written to this point. The resulting value must be captured within an
+// `absl::FormatCountCapture` type.
+//
+// Implementation-defined behavior:
+// * A null pointer provided to "%s" or "%p" is output as "(nil)".
+// * A non-null pointer provided to "%p" is output in hex as if by %#x or
+// %#lx.
+//
+// NOTE: `o`, `x\X` and `u` will convert signed values to their unsigned
+// counterpart before formatting.
+//
+// Examples:
+// "%c", 'a' -> "a"
+// "%c", 32 -> " "
+// "%s", "C" -> "C"
+// "%s", std::string("C++") -> "C++"
+// "%d", -10 -> "-10"
+// "%o", 10 -> "12"
+// "%x", 16 -> "10"
+// "%f", 123456789 -> "123456789.000000"
+// "%e", .01 -> "1.00000e-2"
+// "%a", -3.0 -> "-0x1.8p+1"
+// "%g", .01 -> "1e-2"
+// "%p", (void*)&value -> "0x7ffdeb6ad2a4"
+//
+// int n = 0;
+// std::string s = absl::StrFormat(
+// "%s%d%n", "hello", 123, absl::FormatCountCapture(&n));
+// EXPECT_EQ(8, n);
+//
+// The `FormatSpec` intrinsically supports all of these fundamental C++ types:
+//
+// * Characters: `char`, `signed char`, `unsigned char`
+// * Integers: `int`, `short`, `unsigned short`, `unsigned`, `long`,
+// `unsigned long`, `long long`, `unsigned long long`
+// * Floating-point: `float`, `double`, `long double`
+//
+// However, in the `str_format` library, a format conversion specifies a broader
+// C++ conceptual category instead of an exact type. For example, `%s` binds to
+// any string-like argument, so `std::string`, `absl::string_view`, and
+// `const char*` are all accepted. Likewise, `%d` accepts any integer-like
+// argument, etc.
+
+template <typename... Args>
+using FormatSpec = str_format_internal::FormatSpecTemplate<
+ str_format_internal::ArgumentToConv<Args>()...>;
+
+// ParsedFormat
+//
+// A `ParsedFormat` is a class template representing a preparsed `FormatSpec`,
+// with template arguments specifying the conversion characters used within the
+// format string. Such characters must be valid format type specifiers, and
+// these type specifiers are checked at compile-time.
+//
+// Instances of `ParsedFormat` can be created, copied, and reused to speed up
+// formatting loops. A `ParsedFormat` may either be constructed statically, or
+// dynamically through its `New()` factory function, which only constructs a
+// runtime object if the format is valid at that time.
+//
+// Example:
+//
+// // Verified at compile time.
+// absl::ParsedFormat<'s', 'd'> formatString("Welcome to %s, Number %d!");
+// absl::StrFormat(formatString, "TheVillage", 6);
+//
+// // Verified at runtime.
+// auto format_runtime = absl::ParsedFormat<'d'>::New(format_string);
+// if (format_runtime) {
+// value = absl::StrFormat(*format_runtime, i);
+// } else {
+// ... error case ...
+// }
+
+#if defined(__cpp_nontype_template_parameter_auto)
+// If C++17 is available, an 'extended' format is also allowed that can specify
+// multiple conversion characters per format argument, using a combination of
+// `absl::FormatConversionCharSet` enum values (logically a set union)
+// via the `|` operator. (Single character-based arguments are still accepted,
+// but cannot be combined). Some common conversions also have predefined enum
+// values, such as `absl::FormatConversionCharSet::kIntegral`.
+//
+// Example:
+// // Extended format supports multiple conversion characters per argument,
+// // specified via a combination of `FormatConversionCharSet` enums.
+// using MyFormat = absl::ParsedFormat<absl::FormatConversionCharSet::d |
+// absl::FormatConversionCharSet::x>;
+// MyFormat GetFormat(bool use_hex) {
+// if (use_hex) return MyFormat("foo %x bar");
+// return MyFormat("foo %d bar");
+// }
+// // `format` can be used with any value that supports 'd' and 'x',
+// // like `int`.
+// auto format = GetFormat(use_hex);
+// value = StringF(format, i);
+template <auto... Conv>
+using ParsedFormat = absl::str_format_internal::ExtendedParsedFormat<
+ absl::str_format_internal::ToFormatConversionCharSet(Conv)...>;
+#else
+template <char... Conv>
+using ParsedFormat = str_format_internal::ExtendedParsedFormat<
+ absl::str_format_internal::ToFormatConversionCharSet(Conv)...>;
+#endif // defined(__cpp_nontype_template_parameter_auto)
+
+// StrFormat()
+//
+// Returns a `string` given a `printf()`-style format string and zero or more
+// additional arguments. Use it as you would `sprintf()`. `StrFormat()` is the
+// primary formatting function within the `str_format` library, and should be
+// used in most cases where you need type-safe conversion of types into
+// formatted strings.
+//
+// The format string generally consists of ordinary character data along with
+// one or more format conversion specifiers (denoted by the `%` character).
+// Ordinary character data is returned unchanged into the result string, while
+// each conversion specification performs a type substitution from
+// `StrFormat()`'s other arguments. See the comments for `FormatSpec` for full
+// information on the makeup of this format string.
+//
+// Example:
+//
+// std::string s = absl::StrFormat(
+// "Welcome to %s, Number %d!", "The Village", 6);
+// EXPECT_EQ("Welcome to The Village, Number 6!", s);
+//
+// Returns an empty string in case of error.
+template <typename... Args>
+ABSL_MUST_USE_RESULT std::string StrFormat(const FormatSpec<Args...>& format,
+ const Args&... args) {
+ return str_format_internal::FormatPack(
+ str_format_internal::UntypedFormatSpecImpl::Extract(format),
+ {str_format_internal::FormatArgImpl(args)...});
+}
+
+// StrAppendFormat()
+//
+// Appends to a `dst` string given a format string, and zero or more additional
+// arguments, returning `*dst` as a convenience for chaining purposes. Appends
+// nothing in case of error (but possibly alters its capacity).
+//
+// Example:
+//
+// std::string orig("For example PI is approximately ");
+// std::cout << StrAppendFormat(&orig, "%12.6f", 3.14);
+template <typename... Args>
+std::string& StrAppendFormat(std::string* dst,
+ const FormatSpec<Args...>& format,
+ const Args&... args) {
+ return str_format_internal::AppendPack(
+ dst, str_format_internal::UntypedFormatSpecImpl::Extract(format),
+ {str_format_internal::FormatArgImpl(args)...});
+}
+
+// StreamFormat()
+//
+// Writes to an output stream given a format string and zero or more arguments,
+// generally in a manner that is more efficient than streaming the result of
+// `absl:: StrFormat()`. The returned object must be streamed before the full
+// expression ends.
+//
+// Example:
+//
+// std::cout << StreamFormat("%12.6f", 3.14);
+template <typename... Args>
+ABSL_MUST_USE_RESULT str_format_internal::Streamable StreamFormat(
+ const FormatSpec<Args...>& format, const Args&... args) {
+ return str_format_internal::Streamable(
+ str_format_internal::UntypedFormatSpecImpl::Extract(format),
+ {str_format_internal::FormatArgImpl(args)...});
+}
+
+// PrintF()
+//
+// Writes to stdout given a format string and zero or more arguments. This
+// function is functionally equivalent to `std::printf()` (and type-safe);
+// prefer `absl::PrintF()` over `std::printf()`.
+//
+// Example:
+//
+// std::string_view s = "Ulaanbaatar";
+// absl::PrintF("The capital of Mongolia is %s", s);
+//
+// Outputs: "The capital of Mongolia is Ulaanbaatar"
+//
+template <typename... Args>
+int PrintF(const FormatSpec<Args...>& format, const Args&... args) {
+ return str_format_internal::FprintF(
+ stdout, str_format_internal::UntypedFormatSpecImpl::Extract(format),
+ {str_format_internal::FormatArgImpl(args)...});
+}
+
+// FPrintF()
+//
+// Writes to a file given a format string and zero or more arguments. This
+// function is functionally equivalent to `std::fprintf()` (and type-safe);
+// prefer `absl::FPrintF()` over `std::fprintf()`.
+//
+// Example:
+//
+// std::string_view s = "Ulaanbaatar";
+// absl::FPrintF(stdout, "The capital of Mongolia is %s", s);
+//
+// Outputs: "The capital of Mongolia is Ulaanbaatar"
+//
+template <typename... Args>
+int FPrintF(std::FILE* output, const FormatSpec<Args...>& format,
+ const Args&... args) {
+ return str_format_internal::FprintF(
+ output, str_format_internal::UntypedFormatSpecImpl::Extract(format),
+ {str_format_internal::FormatArgImpl(args)...});
+}
+
+// SNPrintF()
+//
+// Writes to a sized buffer given a format string and zero or more arguments.
+// This function is functionally equivalent to `std::snprintf()` (and
+// type-safe); prefer `absl::SNPrintF()` over `std::snprintf()`.
+//
+// In particular, a successful call to `absl::SNPrintF()` writes at most `size`
+// bytes of the formatted output to `output`, including a NUL-terminator, and
+// returns the number of bytes that would have been written if truncation did
+// not occur. In the event of an error, a negative value is returned and `errno`
+// is set.
+//
+// Example:
+//
+// std::string_view s = "Ulaanbaatar";
+// char output[128];
+// absl::SNPrintF(output, sizeof(output),
+// "The capital of Mongolia is %s", s);
+//
+// Post-condition: output == "The capital of Mongolia is Ulaanbaatar"
+//
+template <typename... Args>
+int SNPrintF(char* output, std::size_t size, const FormatSpec<Args...>& format,
+ const Args&... args) {
+ return str_format_internal::SnprintF(
+ output, size, str_format_internal::UntypedFormatSpecImpl::Extract(format),
+ {str_format_internal::FormatArgImpl(args)...});
+}
+
+// -----------------------------------------------------------------------------
+// Custom Output Formatting Functions
+// -----------------------------------------------------------------------------
+
+// FormatRawSink
+//
+// FormatRawSink is a type erased wrapper around arbitrary sink objects
+// specifically used as an argument to `Format()`.
+//
+// All the object has to do define an overload of `AbslFormatFlush()` for the
+// sink, usually by adding a ADL-based free function in the same namespace as
+// the sink:
+//
+// void AbslFormatFlush(MySink* dest, absl::string_view part);
+//
+// where `dest` is the pointer passed to `absl::Format()`. The function should
+// append `part` to `dest`.
+//
+// FormatRawSink does not own the passed sink object. The passed object must
+// outlive the FormatRawSink.
+class FormatRawSink {
+ public:
+ // Implicitly convert from any type that provides the hook function as
+ // described above.
+ template <typename T,
+ typename = typename std::enable_if<std::is_constructible<
+ str_format_internal::FormatRawSinkImpl, T*>::value>::type>
+ FormatRawSink(T* raw) // NOLINT
+ : sink_(raw) {}
+
+ private:
+ friend str_format_internal::FormatRawSinkImpl;
+ str_format_internal::FormatRawSinkImpl sink_;
+};
+
+// Format()
+//
+// Writes a formatted string to an arbitrary sink object (implementing the
+// `absl::FormatRawSink` interface), using a format string and zero or more
+// additional arguments.
+//
+// By default, `std::string`, `std::ostream`, and `absl::Cord` are supported as
+// destination objects. If a `std::string` is used the formatted string is
+// appended to it.
+//
+// `absl::Format()` is a generic version of `absl::StrAppendFormat()`, for
+// custom sinks. The format string, like format strings for `StrFormat()`, is
+// checked at compile-time.
+//
+// On failure, this function returns `false` and the state of the sink is
+// unspecified.
+template <typename... Args>
+bool Format(FormatRawSink raw_sink, const FormatSpec<Args...>& format,
+ const Args&... args) {
+ return str_format_internal::FormatUntyped(
+ str_format_internal::FormatRawSinkImpl::Extract(raw_sink),
+ str_format_internal::UntypedFormatSpecImpl::Extract(format),
+ {str_format_internal::FormatArgImpl(args)...});
+}
+
+// FormatArg
+//
+// A type-erased handle to a format argument specifically used as an argument to
+// `FormatUntyped()`. You may construct `FormatArg` by passing
+// reference-to-const of any printable type. `FormatArg` is both copyable and
+// assignable. The source data must outlive the `FormatArg` instance. See
+// example below.
+//
+using FormatArg = str_format_internal::FormatArgImpl;
+
+// FormatUntyped()
+//
+// Writes a formatted string to an arbitrary sink object (implementing the
+// `absl::FormatRawSink` interface), using an `UntypedFormatSpec` and zero or
+// more additional arguments.
+//
+// This function acts as the most generic formatting function in the
+// `str_format` library. The caller provides a raw sink, an unchecked format
+// string, and (usually) a runtime specified list of arguments; no compile-time
+// checking of formatting is performed within this function. As a result, a
+// caller should check the return value to verify that no error occurred.
+// On failure, this function returns `false` and the state of the sink is
+// unspecified.
+//
+// The arguments are provided in an `absl::Span<const absl::FormatArg>`.
+// Each `absl::FormatArg` object binds to a single argument and keeps a
+// reference to it. The values used to create the `FormatArg` objects must
+// outlive this function call. (See `str_format_arg.h` for information on
+// the `FormatArg` class.)_
+//
+// Example:
+//
+// std::optional<std::string> FormatDynamic(
+// const std::string& in_format,
+// const vector<std::string>& in_args) {
+// std::string out;
+// std::vector<absl::FormatArg> args;
+// for (const auto& v : in_args) {
+// // It is important that 'v' is a reference to the objects in in_args.
+// // The values we pass to FormatArg must outlive the call to
+// // FormatUntyped.
+// args.emplace_back(v);
+// }
+// absl::UntypedFormatSpec format(in_format);
+// if (!absl::FormatUntyped(&out, format, args)) {
+// return std::nullopt;
+// }
+// return std::move(out);
+// }
+//
+ABSL_MUST_USE_RESULT inline bool FormatUntyped(
+ FormatRawSink raw_sink, const UntypedFormatSpec& format,
+ absl::Span<const FormatArg> args) {
+ return str_format_internal::FormatUntyped(
+ str_format_internal::FormatRawSinkImpl::Extract(raw_sink),
+ str_format_internal::UntypedFormatSpecImpl::Extract(format), args);
+}
+
+//------------------------------------------------------------------------------
+// StrFormat Extensions
+//------------------------------------------------------------------------------
+//
+// AbslFormatConvert()
+//
+// The StrFormat library provides a customization API for formatting
+// user-defined types using absl::StrFormat(). The API relies on detecting an
+// overload in the user-defined type's namespace of a free (non-member)
+// `AbslFormatConvert()` function, usually as a friend definition with the
+// following signature:
+//
+// absl::FormatConvertResult<...> AbslFormatConvert(
+// const X& value,
+// const absl::FormatConversionSpec& spec,
+// absl::FormatSink *sink);
+//
+// An `AbslFormatConvert()` overload for a type should only be declared in the
+// same file and namespace as said type.
+//
+// The abstractions within this definition include:
+//
+// * An `absl::FormatConversionSpec` to specify the fields to pull from a
+// user-defined type's format string
+// * An `absl::FormatSink` to hold the converted string data during the
+// conversion process.
+// * An `absl::FormatConvertResult` to hold the status of the returned
+// formatting operation
+//
+// The return type encodes all the conversion characters that your
+// AbslFormatConvert() routine accepts. The return value should be {true}.
+// A return value of {false} will result in `StrFormat()` returning
+// an empty string. This result will be propagated to the result of
+// `FormatUntyped`.
+//
+// Example:
+//
+// struct Point {
+// // To add formatting support to `Point`, we simply need to add a free
+// // (non-member) function `AbslFormatConvert()`. This method interprets
+// // `spec` to print in the request format. The allowed conversion characters
+// // can be restricted via the type of the result, in this example
+// // string and integral formatting are allowed (but not, for instance
+// // floating point characters like "%f"). You can add such a free function
+// // using a friend declaration within the body of the class:
+// friend absl::FormatConvertResult<absl::FormatConversionCharSet::kString |
+// absl::FormatConversionCharSet::kIntegral>
+// AbslFormatConvert(const Point& p, const absl::FormatConversionSpec& spec,
+// absl::FormatSink* s) {
+// if (spec.conversion_char() == absl::FormatConversionChar::s) {
+// s->Append(absl::StrCat("x=", p.x, " y=", p.y));
+// } else {
+// s->Append(absl::StrCat(p.x, ",", p.y));
+// }
+// return {true};
+// }
+//
+// int x;
+// int y;
+// };
+
+// clang-format off
+
+// FormatConversionChar
+//
+// Specifies the formatting character provided in the format string
+// passed to `StrFormat()`.
+enum class FormatConversionChar : uint8_t {
+ c, s, // text
+ d, i, o, u, x, X, // int
+ f, F, e, E, g, G, a, A, // float
+ n, p // misc
+};
+// clang-format on
+
+// FormatConversionSpec
+//
+// Specifies modifications to the conversion of the format string, through use
+// of one or more format flags in the source format string.
+class FormatConversionSpec {
+ public:
+ // FormatConversionSpec::is_basic()
+ //
+ // Indicates that width and precision are not specified, and no additional
+ // flags are set for this conversion character in the format string.
+ bool is_basic() const { return impl_.is_basic(); }
+
+ // FormatConversionSpec::has_left_flag()
+ //
+ // Indicates whether the result should be left justified for this conversion
+ // character in the format string. This flag is set through use of a '-'
+ // character in the format string. E.g. "%-s"
+ bool has_left_flag() const { return impl_.has_left_flag(); }
+
+ // FormatConversionSpec::has_show_pos_flag()
+ //
+ // Indicates whether a sign column is prepended to the result for this
+ // conversion character in the format string, even if the result is positive.
+ // This flag is set through use of a '+' character in the format string.
+ // E.g. "%+d"
+ bool has_show_pos_flag() const { return impl_.has_show_pos_flag(); }
+
+ // FormatConversionSpec::has_sign_col_flag()
+ //
+ // Indicates whether a mandatory sign column is added to the result for this
+ // conversion character. This flag is set through use of a space character
+ // (' ') in the format string. E.g. "% i"
+ bool has_sign_col_flag() const { return impl_.has_sign_col_flag(); }
+
+ // FormatConversionSpec::has_alt_flag()
+ //
+ // Indicates whether an "alternate" format is applied to the result for this
+ // conversion character. Alternative forms depend on the type of conversion
+ // character, and unallowed alternatives are undefined. This flag is set
+ // through use of a '#' character in the format string. E.g. "%#h"
+ bool has_alt_flag() const { return impl_.has_alt_flag(); }
+
+ // FormatConversionSpec::has_zero_flag()
+ //
+ // Indicates whether zeroes should be prepended to the result for this
+ // conversion character instead of spaces. This flag is set through use of the
+ // '0' character in the format string. E.g. "%0f"
+ bool has_zero_flag() const { return impl_.has_zero_flag(); }
+
+ // FormatConversionSpec::conversion_char()
+ //
+ // Returns the underlying conversion character.
+ FormatConversionChar conversion_char() const {
+ return impl_.conversion_char();
+ }
+
+ // FormatConversionSpec::width()
+ //
+ // Returns the specified width (indicated through use of a non-zero integer
+ // value or '*' character) of the conversion character. If width is
+ // unspecified, it returns a negative value.
+ int width() const { return impl_.width(); }
+
+ // FormatConversionSpec::precision()
+ //
+ // Returns the specified precision (through use of the '.' character followed
+ // by a non-zero integer value or '*' character) of the conversion character.
+ // If precision is unspecified, it returns a negative value.
+ int precision() const { return impl_.precision(); }
+
+ private:
+ explicit FormatConversionSpec(
+ str_format_internal::FormatConversionSpecImpl impl)
+ : impl_(impl) {}
+
+ friend str_format_internal::FormatConversionSpecImpl;
+
+ absl::str_format_internal::FormatConversionSpecImpl impl_;
+};
+
+// Type safe OR operator for FormatConversionCharSet to allow accepting multiple
+// conversion chars in custom format converters.
+constexpr FormatConversionCharSet operator|(FormatConversionCharSet a,
+ FormatConversionCharSet b) {
+ return static_cast<FormatConversionCharSet>(static_cast<uint64_t>(a) |
+ static_cast<uint64_t>(b));
+}
+
+// FormatConversionCharSet
+//
+// Specifies the _accepted_ conversion types as a template parameter to
+// FormatConvertResult for custom implementations of `AbslFormatConvert`.
+// Note the helper predefined alias definitions (kIntegral, etc.) below.
+enum class FormatConversionCharSet : uint64_t {
+ // text
+ c = str_format_internal::FormatConversionCharToConvInt('c'),
+ s = str_format_internal::FormatConversionCharToConvInt('s'),
+ // integer
+ d = str_format_internal::FormatConversionCharToConvInt('d'),
+ i = str_format_internal::FormatConversionCharToConvInt('i'),
+ o = str_format_internal::FormatConversionCharToConvInt('o'),
+ u = str_format_internal::FormatConversionCharToConvInt('u'),
+ x = str_format_internal::FormatConversionCharToConvInt('x'),
+ X = str_format_internal::FormatConversionCharToConvInt('X'),
+ // Float
+ f = str_format_internal::FormatConversionCharToConvInt('f'),
+ F = str_format_internal::FormatConversionCharToConvInt('F'),
+ e = str_format_internal::FormatConversionCharToConvInt('e'),
+ E = str_format_internal::FormatConversionCharToConvInt('E'),
+ g = str_format_internal::FormatConversionCharToConvInt('g'),
+ G = str_format_internal::FormatConversionCharToConvInt('G'),
+ a = str_format_internal::FormatConversionCharToConvInt('a'),
+ A = str_format_internal::FormatConversionCharToConvInt('A'),
+ // misc
+ n = str_format_internal::FormatConversionCharToConvInt('n'),
+ p = str_format_internal::FormatConversionCharToConvInt('p'),
+
+ // Used for width/precision '*' specification.
+ kStar = static_cast<uint64_t>(
+ absl::str_format_internal::FormatConversionCharSetInternal::kStar),
+ // Some predefined values:
+ kIntegral = d | i | u | o | x | X,
+ kFloating = a | e | f | g | A | E | F | G,
+ kNumeric = kIntegral | kFloating,
+ kString = s,
+ kPointer = p,
+};
+
+// FormatSink
+//
+// An abstraction to which conversions write their string data.
+//
+class FormatSink {
+ public:
+ // Appends `count` copies of `ch`.
+ void Append(size_t count, char ch) { sink_->Append(count, ch); }
+
+ void Append(string_view v) { sink_->Append(v); }
+
+ // Appends the first `precision` bytes of `v`. If this is less than
+ // `width`, spaces will be appended first (if `left` is false), or
+ // after (if `left` is true) to ensure the total amount appended is
+ // at least `width`.
+ bool PutPaddedString(string_view v, int width, int precision, bool left) {
+ return sink_->PutPaddedString(v, width, precision, left);
+ }
+
+ private:
+ friend str_format_internal::FormatSinkImpl;
+ explicit FormatSink(str_format_internal::FormatSinkImpl* s) : sink_(s) {}
+ str_format_internal::FormatSinkImpl* sink_;
+};
+
+// FormatConvertResult
+//
+// Indicates whether a call to AbslFormatConvert() was successful.
+// This return type informs the StrFormat extension framework (through
+// ADL but using the return type) of what conversion characters are supported.
+// It is strongly discouraged to return {false}, as this will result in an
+// empty string in StrFormat.
+template <FormatConversionCharSet C>
+struct FormatConvertResult {
+ bool value;
+};
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_STRINGS_STR_FORMAT_H_
diff --git a/third_party/abseil/src/absl/strings/str_format_test.cc b/third_party/abseil/src/absl/strings/str_format_test.cc
new file mode 100644
index 0000000..c60027a
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/str_format_test.cc
@@ -0,0 +1,774 @@
+// Copyright 2020 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/strings/str_format.h"
+
+#include <cstdarg>
+#include <cstdint>
+#include <cstdio>
+#include <string>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/strings/cord.h"
+#include "absl/strings/str_cat.h"
+#include "absl/strings/string_view.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace {
+using str_format_internal::FormatArgImpl;
+
+using FormatEntryPointTest = ::testing::Test;
+
+TEST_F(FormatEntryPointTest, Format) {
+ std::string sink;
+ EXPECT_TRUE(Format(&sink, "A format %d", 123));
+ EXPECT_EQ("A format 123", sink);
+ sink.clear();
+
+ ParsedFormat<'d'> pc("A format %d");
+ EXPECT_TRUE(Format(&sink, pc, 123));
+ EXPECT_EQ("A format 123", sink);
+}
+TEST_F(FormatEntryPointTest, UntypedFormat) {
+ constexpr const char* formats[] = {
+ "",
+ "a",
+ "%80d",
+#if !defined(_MSC_VER) && !defined(__ANDROID__) && !defined(__native_client__)
+ // MSVC, NaCL and Android don't support positional syntax.
+ "complicated multipart %% %1$d format %1$0999d",
+#endif // _MSC_VER
+ };
+ for (const char* fmt : formats) {
+ std::string actual;
+ int i = 123;
+ FormatArgImpl arg_123(i);
+ absl::Span<const FormatArgImpl> args(&arg_123, 1);
+ UntypedFormatSpec format(fmt);
+
+ EXPECT_TRUE(FormatUntyped(&actual, format, args));
+ char buf[4096]{};
+ snprintf(buf, sizeof(buf), fmt, 123);
+ EXPECT_EQ(
+ str_format_internal::FormatPack(
+ str_format_internal::UntypedFormatSpecImpl::Extract(format), args),
+ buf);
+ EXPECT_EQ(actual, buf);
+ }
+ // The internal version works with a preparsed format.
+ ParsedFormat<'d'> pc("A format %d");
+ int i = 345;
+ FormatArg arg(i);
+ std::string out;
+ EXPECT_TRUE(str_format_internal::FormatUntyped(
+ &out, str_format_internal::UntypedFormatSpecImpl(&pc), {&arg, 1}));
+ EXPECT_EQ("A format 345", out);
+}
+
+TEST_F(FormatEntryPointTest, StringFormat) {
+ EXPECT_EQ("123", StrFormat("%d", 123));
+ constexpr absl::string_view view("=%d=", 4);
+ EXPECT_EQ("=123=", StrFormat(view, 123));
+}
+
+TEST_F(FormatEntryPointTest, AppendFormat) {
+ std::string s;
+ std::string& r = StrAppendFormat(&s, "%d", 123);
+ EXPECT_EQ(&s, &r); // should be same object
+ EXPECT_EQ("123", r);
+}
+
+TEST_F(FormatEntryPointTest, AppendFormatFail) {
+ std::string s = "orig";
+
+ UntypedFormatSpec format(" more %d");
+ FormatArgImpl arg("not an int");
+
+ EXPECT_EQ("orig",
+ str_format_internal::AppendPack(
+ &s, str_format_internal::UntypedFormatSpecImpl::Extract(format),
+ {&arg, 1}));
+}
+
+
+TEST_F(FormatEntryPointTest, ManyArgs) {
+ EXPECT_EQ("24", StrFormat("%24$d", 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13,
+ 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24));
+ EXPECT_EQ("60", StrFormat("%60$d", 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13,
+ 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26,
+ 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39,
+ 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52,
+ 53, 54, 55, 56, 57, 58, 59, 60));
+}
+
+TEST_F(FormatEntryPointTest, Preparsed) {
+ ParsedFormat<'d'> pc("%d");
+ EXPECT_EQ("123", StrFormat(pc, 123));
+ // rvalue ok?
+ EXPECT_EQ("123", StrFormat(ParsedFormat<'d'>("%d"), 123));
+ constexpr absl::string_view view("=%d=", 4);
+ EXPECT_EQ("=123=", StrFormat(ParsedFormat<'d'>(view), 123));
+}
+
+TEST_F(FormatEntryPointTest, FormatCountCapture) {
+ int n = 0;
+ EXPECT_EQ("", StrFormat("%n", FormatCountCapture(&n)));
+ EXPECT_EQ(0, n);
+ EXPECT_EQ("123", StrFormat("%d%n", 123, FormatCountCapture(&n)));
+ EXPECT_EQ(3, n);
+}
+
+TEST_F(FormatEntryPointTest, FormatCountCaptureWrongType) {
+ // Should reject int*.
+ int n = 0;
+ UntypedFormatSpec format("%d%n");
+ int i = 123, *ip = &n;
+ FormatArgImpl args[2] = {FormatArgImpl(i), FormatArgImpl(ip)};
+
+ EXPECT_EQ("", str_format_internal::FormatPack(
+ str_format_internal::UntypedFormatSpecImpl::Extract(format),
+ absl::MakeSpan(args)));
+}
+
+TEST_F(FormatEntryPointTest, FormatCountCaptureMultiple) {
+ int n1 = 0;
+ int n2 = 0;
+ EXPECT_EQ(" 1 2",
+ StrFormat("%5d%n%10d%n", 1, FormatCountCapture(&n1), 2,
+ FormatCountCapture(&n2)));
+ EXPECT_EQ(5, n1);
+ EXPECT_EQ(15, n2);
+}
+
+TEST_F(FormatEntryPointTest, FormatCountCaptureExample) {
+ int n;
+ std::string s;
+ StrAppendFormat(&s, "%s: %n%s\n", "(1,1)", FormatCountCapture(&n), "(1,2)");
+ StrAppendFormat(&s, "%*s%s\n", n, "", "(2,2)");
+ EXPECT_EQ(7, n);
+ EXPECT_EQ(
+ "(1,1): (1,2)\n"
+ " (2,2)\n",
+ s);
+}
+
+TEST_F(FormatEntryPointTest, Stream) {
+ const std::string formats[] = {
+ "",
+ "a",
+ "%80d",
+ "%d %u %c %s %f %g",
+#if !defined(_MSC_VER) && !defined(__ANDROID__) && !defined(__native_client__)
+ // MSVC, NaCL and Android don't support positional syntax.
+ "complicated multipart %% %1$d format %1$080d",
+#endif // _MSC_VER
+ };
+ std::string buf(4096, '\0');
+ for (const auto& fmt : formats) {
+ const auto parsed =
+ ParsedFormat<'d', 'u', 'c', 's', 'f', 'g'>::NewAllowIgnored(fmt);
+ std::ostringstream oss;
+ oss << StreamFormat(*parsed, 123, 3, 49, "multistreaming!!!", 1.01, 1.01);
+ int fmt_result = snprintf(&*buf.begin(), buf.size(), fmt.c_str(), //
+ 123, 3, 49, "multistreaming!!!", 1.01, 1.01);
+ ASSERT_TRUE(oss) << fmt;
+ ASSERT_TRUE(fmt_result >= 0 && static_cast<size_t>(fmt_result) < buf.size())
+ << fmt_result;
+ EXPECT_EQ(buf.c_str(), oss.str());
+ }
+}
+
+TEST_F(FormatEntryPointTest, StreamOk) {
+ std::ostringstream oss;
+ oss << StreamFormat("hello %d", 123);
+ EXPECT_EQ("hello 123", oss.str());
+ EXPECT_TRUE(oss.good());
+}
+
+TEST_F(FormatEntryPointTest, StreamFail) {
+ std::ostringstream oss;
+ UntypedFormatSpec format("hello %d");
+ FormatArgImpl arg("non-numeric");
+ oss << str_format_internal::Streamable(
+ str_format_internal::UntypedFormatSpecImpl::Extract(format), {&arg, 1});
+ EXPECT_EQ("hello ", oss.str()); // partial write
+ EXPECT_TRUE(oss.fail());
+}
+
+std::string WithSnprintf(const char* fmt, ...) {
+ std::string buf;
+ buf.resize(128);
+ va_list va;
+ va_start(va, fmt);
+ int r = vsnprintf(&*buf.begin(), buf.size(), fmt, va);
+ va_end(va);
+ EXPECT_GE(r, 0);
+ EXPECT_LT(r, buf.size());
+ buf.resize(r);
+ return buf;
+}
+
+TEST_F(FormatEntryPointTest, FloatPrecisionArg) {
+ // Test that positional parameters for width and precision
+ // are indexed to precede the value.
+ // Also sanity check the same formats against snprintf.
+ EXPECT_EQ("0.1", StrFormat("%.1f", 0.1));
+ EXPECT_EQ("0.1", WithSnprintf("%.1f", 0.1));
+ EXPECT_EQ(" 0.1", StrFormat("%*.1f", 5, 0.1));
+ EXPECT_EQ(" 0.1", WithSnprintf("%*.1f", 5, 0.1));
+ EXPECT_EQ("0.1", StrFormat("%.*f", 1, 0.1));
+ EXPECT_EQ("0.1", WithSnprintf("%.*f", 1, 0.1));
+ EXPECT_EQ(" 0.1", StrFormat("%*.*f", 5, 1, 0.1));
+ EXPECT_EQ(" 0.1", WithSnprintf("%*.*f", 5, 1, 0.1));
+}
+namespace streamed_test {
+struct X {};
+std::ostream& operator<<(std::ostream& os, const X&) {
+ return os << "X";
+}
+} // streamed_test
+
+TEST_F(FormatEntryPointTest, FormatStreamed) {
+ EXPECT_EQ("123", StrFormat("%s", FormatStreamed(123)));
+ EXPECT_EQ(" 123", StrFormat("%5s", FormatStreamed(123)));
+ EXPECT_EQ("123 ", StrFormat("%-5s", FormatStreamed(123)));
+ EXPECT_EQ("X", StrFormat("%s", FormatStreamed(streamed_test::X())));
+ EXPECT_EQ("123", StrFormat("%s", FormatStreamed(StreamFormat("%d", 123))));
+}
+
+// Helper class that creates a temporary file and exposes a FILE* to it.
+// It will close the file on destruction.
+class TempFile {
+ public:
+ TempFile() : file_(std::tmpfile()) {}
+ ~TempFile() { std::fclose(file_); }
+
+ std::FILE* file() const { return file_; }
+
+ // Read the file into a string.
+ std::string ReadFile() {
+ std::fseek(file_, 0, SEEK_END);
+ int size = std::ftell(file_);
+ EXPECT_GT(size, 0);
+ std::rewind(file_);
+ std::string str(2 * size, ' ');
+ int read_bytes = std::fread(&str[0], 1, str.size(), file_);
+ EXPECT_EQ(read_bytes, size);
+ str.resize(read_bytes);
+ EXPECT_TRUE(std::feof(file_));
+ return str;
+ }
+
+ private:
+ std::FILE* file_;
+};
+
+TEST_F(FormatEntryPointTest, FPrintF) {
+ TempFile tmp;
+ int result =
+ FPrintF(tmp.file(), "STRING: %s NUMBER: %010d", std::string("ABC"), -19);
+ EXPECT_EQ(result, 30);
+ EXPECT_EQ(tmp.ReadFile(), "STRING: ABC NUMBER: -000000019");
+}
+
+TEST_F(FormatEntryPointTest, FPrintFError) {
+ errno = 0;
+ int result = FPrintF(stdin, "ABC");
+ EXPECT_LT(result, 0);
+ EXPECT_EQ(errno, EBADF);
+}
+
+#ifdef __GLIBC__
+TEST_F(FormatEntryPointTest, FprintfTooLarge) {
+ std::FILE* f = std::fopen("/dev/null", "w");
+ int width = 2000000000;
+ errno = 0;
+ int result = FPrintF(f, "%*d %*d", width, 0, width, 0);
+ EXPECT_LT(result, 0);
+ EXPECT_EQ(errno, EFBIG);
+ std::fclose(f);
+}
+
+TEST_F(FormatEntryPointTest, PrintF) {
+ int stdout_tmp = dup(STDOUT_FILENO);
+
+ TempFile tmp;
+ std::fflush(stdout);
+ dup2(fileno(tmp.file()), STDOUT_FILENO);
+
+ int result = PrintF("STRING: %s NUMBER: %010d", std::string("ABC"), -19);
+
+ std::fflush(stdout);
+ dup2(stdout_tmp, STDOUT_FILENO);
+ close(stdout_tmp);
+
+ EXPECT_EQ(result, 30);
+ EXPECT_EQ(tmp.ReadFile(), "STRING: ABC NUMBER: -000000019");
+}
+#endif // __GLIBC__
+
+TEST_F(FormatEntryPointTest, SNPrintF) {
+ char buffer[16];
+ int result =
+ SNPrintF(buffer, sizeof(buffer), "STRING: %s", std::string("ABC"));
+ EXPECT_EQ(result, 11);
+ EXPECT_EQ(std::string(buffer), "STRING: ABC");
+
+ result = SNPrintF(buffer, sizeof(buffer), "NUMBER: %d", 123456);
+ EXPECT_EQ(result, 14);
+ EXPECT_EQ(std::string(buffer), "NUMBER: 123456");
+
+ result = SNPrintF(buffer, sizeof(buffer), "NUMBER: %d", 1234567);
+ EXPECT_EQ(result, 15);
+ EXPECT_EQ(std::string(buffer), "NUMBER: 1234567");
+
+ result = SNPrintF(buffer, sizeof(buffer), "NUMBER: %d", 12345678);
+ EXPECT_EQ(result, 16);
+ EXPECT_EQ(std::string(buffer), "NUMBER: 1234567");
+
+ result = SNPrintF(buffer, sizeof(buffer), "NUMBER: %d", 123456789);
+ EXPECT_EQ(result, 17);
+ EXPECT_EQ(std::string(buffer), "NUMBER: 1234567");
+
+ result = SNPrintF(nullptr, 0, "Just checking the %s of the output.", "size");
+ EXPECT_EQ(result, 37);
+}
+
+TEST(StrFormat, BehavesAsDocumented) {
+ std::string s = absl::StrFormat("%s, %d!", "Hello", 123);
+ EXPECT_EQ("Hello, 123!", s);
+ // The format of a replacement is
+ // '%'[position][flags][width['.'precision]][length_modifier][format]
+ EXPECT_EQ(absl::StrFormat("%1$+3.2Lf", 1.1), "+1.10");
+ // Text conversion:
+ // "c" - Character. Eg: 'a' -> "A", 20 -> " "
+ EXPECT_EQ(StrFormat("%c", 'a'), "a");
+ EXPECT_EQ(StrFormat("%c", 0x20), " ");
+ // Formats char and integral types: int, long, uint64_t, etc.
+ EXPECT_EQ(StrFormat("%c", int{'a'}), "a");
+ EXPECT_EQ(StrFormat("%c", long{'a'}), "a"); // NOLINT
+ EXPECT_EQ(StrFormat("%c", uint64_t{'a'}), "a");
+ // "s" - string Eg: "C" -> "C", std::string("C++") -> "C++"
+ // Formats std::string, char*, string_view, and Cord.
+ EXPECT_EQ(StrFormat("%s", "C"), "C");
+ EXPECT_EQ(StrFormat("%s", std::string("C++")), "C++");
+ EXPECT_EQ(StrFormat("%s", string_view("view")), "view");
+ EXPECT_EQ(StrFormat("%s", absl::Cord("cord")), "cord");
+ // Integral Conversion
+ // These format integral types: char, int, long, uint64_t, etc.
+ EXPECT_EQ(StrFormat("%d", char{10}), "10");
+ EXPECT_EQ(StrFormat("%d", int{10}), "10");
+ EXPECT_EQ(StrFormat("%d", long{10}), "10"); // NOLINT
+ EXPECT_EQ(StrFormat("%d", uint64_t{10}), "10");
+ // d,i - signed decimal Eg: -10 -> "-10"
+ EXPECT_EQ(StrFormat("%d", -10), "-10");
+ EXPECT_EQ(StrFormat("%i", -10), "-10");
+ // o - octal Eg: 10 -> "12"
+ EXPECT_EQ(StrFormat("%o", 10), "12");
+ // u - unsigned decimal Eg: 10 -> "10"
+ EXPECT_EQ(StrFormat("%u", 10), "10");
+ // x/X - lower,upper case hex Eg: 10 -> "a"/"A"
+ EXPECT_EQ(StrFormat("%x", 10), "a");
+ EXPECT_EQ(StrFormat("%X", 10), "A");
+ // Floating-point, with upper/lower-case output.
+ // These format floating points types: float, double, long double, etc.
+ EXPECT_EQ(StrFormat("%.1f", float{1}), "1.0");
+ EXPECT_EQ(StrFormat("%.1f", double{1}), "1.0");
+ const long double long_double = 1.0;
+ EXPECT_EQ(StrFormat("%.1f", long_double), "1.0");
+ // These also format integral types: char, int, long, uint64_t, etc.:
+ EXPECT_EQ(StrFormat("%.1f", char{1}), "1.0");
+ EXPECT_EQ(StrFormat("%.1f", int{1}), "1.0");
+ EXPECT_EQ(StrFormat("%.1f", long{1}), "1.0"); // NOLINT
+ EXPECT_EQ(StrFormat("%.1f", uint64_t{1}), "1.0");
+ // f/F - decimal. Eg: 123456789 -> "123456789.000000"
+ EXPECT_EQ(StrFormat("%f", 123456789), "123456789.000000");
+ EXPECT_EQ(StrFormat("%F", 123456789), "123456789.000000");
+ // e/E - exponentiated Eg: .01 -> "1.00000e-2"/"1.00000E-2"
+ EXPECT_EQ(StrFormat("%e", .01), "1.000000e-02");
+ EXPECT_EQ(StrFormat("%E", .01), "1.000000E-02");
+ // g/G - exponentiate to fit Eg: .01 -> "0.01", 1e10 ->"1e+10"/"1E+10"
+ EXPECT_EQ(StrFormat("%g", .01), "0.01");
+ EXPECT_EQ(StrFormat("%g", 1e10), "1e+10");
+ EXPECT_EQ(StrFormat("%G", 1e10), "1E+10");
+ // a/A - lower,upper case hex Eg: -3.0 -> "-0x1.8p+1"/"-0X1.8P+1"
+
+// On Android platform <=21, there is a regression in hexfloat formatting.
+#if !defined(__ANDROID_API__) || __ANDROID_API__ > 21
+ EXPECT_EQ(StrFormat("%.1a", -3.0), "-0x1.8p+1"); // .1 to fix MSVC output
+ EXPECT_EQ(StrFormat("%.1A", -3.0), "-0X1.8P+1"); // .1 to fix MSVC output
+#endif
+
+ // Other conversion
+ int64_t value = 0x7ffdeb4;
+ auto ptr_value = static_cast<uintptr_t>(value);
+ const int& something = *reinterpret_cast<const int*>(ptr_value);
+ EXPECT_EQ(StrFormat("%p", &something), StrFormat("0x%x", ptr_value));
+
+ // Output widths are supported, with optional flags.
+ EXPECT_EQ(StrFormat("%3d", 1), " 1");
+ EXPECT_EQ(StrFormat("%3d", 123456), "123456");
+ EXPECT_EQ(StrFormat("%06.2f", 1.234), "001.23");
+ EXPECT_EQ(StrFormat("%+d", 1), "+1");
+ EXPECT_EQ(StrFormat("% d", 1), " 1");
+ EXPECT_EQ(StrFormat("%-4d", -1), "-1 ");
+ EXPECT_EQ(StrFormat("%#o", 10), "012");
+ EXPECT_EQ(StrFormat("%#x", 15), "0xf");
+ EXPECT_EQ(StrFormat("%04d", 8), "0008");
+ // Posix positional substitution.
+ EXPECT_EQ(absl::StrFormat("%2$s, %3$s, %1$s!", "vici", "veni", "vidi"),
+ "veni, vidi, vici!");
+ // Length modifiers are ignored.
+ EXPECT_EQ(StrFormat("%hhd", int{1}), "1");
+ EXPECT_EQ(StrFormat("%hd", int{1}), "1");
+ EXPECT_EQ(StrFormat("%ld", int{1}), "1");
+ EXPECT_EQ(StrFormat("%lld", int{1}), "1");
+ EXPECT_EQ(StrFormat("%Ld", int{1}), "1");
+ EXPECT_EQ(StrFormat("%jd", int{1}), "1");
+ EXPECT_EQ(StrFormat("%zd", int{1}), "1");
+ EXPECT_EQ(StrFormat("%td", int{1}), "1");
+ EXPECT_EQ(StrFormat("%qd", int{1}), "1");
+}
+
+using str_format_internal::ExtendedParsedFormat;
+using str_format_internal::ParsedFormatBase;
+
+struct SummarizeConsumer {
+ std::string* out;
+ explicit SummarizeConsumer(std::string* out) : out(out) {}
+
+ bool Append(string_view s) {
+ *out += "[" + std::string(s) + "]";
+ return true;
+ }
+
+ bool ConvertOne(const str_format_internal::UnboundConversion& conv,
+ string_view s) {
+ *out += "{";
+ *out += std::string(s);
+ *out += ":";
+ *out += std::to_string(conv.arg_position) + "$";
+ if (conv.width.is_from_arg()) {
+ *out += std::to_string(conv.width.get_from_arg()) + "$*";
+ }
+ if (conv.precision.is_from_arg()) {
+ *out += "." + std::to_string(conv.precision.get_from_arg()) + "$*";
+ }
+ *out += str_format_internal::FormatConversionCharToChar(conv.conv);
+ *out += "}";
+ return true;
+ }
+};
+
+std::string SummarizeParsedFormat(const ParsedFormatBase& pc) {
+ std::string out;
+ if (!pc.ProcessFormat(SummarizeConsumer(&out))) out += "!";
+ return out;
+}
+
+using ParsedFormatTest = ::testing::Test;
+
+TEST_F(ParsedFormatTest, SimpleChecked) {
+ EXPECT_EQ("[ABC]{d:1$d}[DEF]",
+ SummarizeParsedFormat(ParsedFormat<'d'>("ABC%dDEF")));
+ EXPECT_EQ("{s:1$s}[FFF]{d:2$d}[ZZZ]{f:3$f}",
+ SummarizeParsedFormat(ParsedFormat<'s', 'd', 'f'>("%sFFF%dZZZ%f")));
+ EXPECT_EQ("{s:1$s}[ ]{.*d:3$.2$*d}",
+ SummarizeParsedFormat(ParsedFormat<'s', '*', 'd'>("%s %.*d")));
+}
+
+TEST_F(ParsedFormatTest, SimpleUncheckedCorrect) {
+ auto f = ParsedFormat<'d'>::New("ABC%dDEF");
+ ASSERT_TRUE(f);
+ EXPECT_EQ("[ABC]{d:1$d}[DEF]", SummarizeParsedFormat(*f));
+
+ std::string format = "%sFFF%dZZZ%f";
+ auto f2 = ParsedFormat<'s', 'd', 'f'>::New(format);
+
+ ASSERT_TRUE(f2);
+ EXPECT_EQ("{s:1$s}[FFF]{d:2$d}[ZZZ]{f:3$f}", SummarizeParsedFormat(*f2));
+
+ f2 = ParsedFormat<'s', 'd', 'f'>::New("%s %d %f");
+
+ ASSERT_TRUE(f2);
+ EXPECT_EQ("{s:1$s}[ ]{d:2$d}[ ]{f:3$f}", SummarizeParsedFormat(*f2));
+
+ auto star = ParsedFormat<'*', 'd'>::New("%*d");
+ ASSERT_TRUE(star);
+ EXPECT_EQ("{*d:2$1$*d}", SummarizeParsedFormat(*star));
+
+ auto dollar = ParsedFormat<'d', 's'>::New("%2$s %1$d");
+ ASSERT_TRUE(dollar);
+ EXPECT_EQ("{2$s:2$s}[ ]{1$d:1$d}", SummarizeParsedFormat(*dollar));
+ // with reuse
+ dollar = ParsedFormat<'d', 's'>::New("%2$s %1$d %1$d");
+ ASSERT_TRUE(dollar);
+ EXPECT_EQ("{2$s:2$s}[ ]{1$d:1$d}[ ]{1$d:1$d}",
+ SummarizeParsedFormat(*dollar));
+}
+
+TEST_F(ParsedFormatTest, SimpleUncheckedIgnoredArgs) {
+ EXPECT_FALSE((ParsedFormat<'d', 's'>::New("ABC")));
+ EXPECT_FALSE((ParsedFormat<'d', 's'>::New("%dABC")));
+ EXPECT_FALSE((ParsedFormat<'d', 's'>::New("ABC%2$s")));
+ auto f = ParsedFormat<'d', 's'>::NewAllowIgnored("ABC");
+ ASSERT_TRUE(f);
+ EXPECT_EQ("[ABC]", SummarizeParsedFormat(*f));
+ f = ParsedFormat<'d', 's'>::NewAllowIgnored("%dABC");
+ ASSERT_TRUE(f);
+ EXPECT_EQ("{d:1$d}[ABC]", SummarizeParsedFormat(*f));
+ f = ParsedFormat<'d', 's'>::NewAllowIgnored("ABC%2$s");
+ ASSERT_TRUE(f);
+ EXPECT_EQ("[ABC]{2$s:2$s}", SummarizeParsedFormat(*f));
+}
+
+TEST_F(ParsedFormatTest, SimpleUncheckedUnsupported) {
+ EXPECT_FALSE(ParsedFormat<'d'>::New("%1$d %1$x"));
+ EXPECT_FALSE(ParsedFormat<'x'>::New("%1$d %1$x"));
+}
+
+TEST_F(ParsedFormatTest, SimpleUncheckedIncorrect) {
+ EXPECT_FALSE(ParsedFormat<'d'>::New(""));
+
+ EXPECT_FALSE(ParsedFormat<'d'>::New("ABC%dDEF%d"));
+
+ std::string format = "%sFFF%dZZZ%f";
+ EXPECT_FALSE((ParsedFormat<'s', 'd', 'g'>::New(format)));
+}
+
+#if defined(__cpp_nontype_template_parameter_auto)
+
+template <auto T>
+std::true_type IsValidParsedFormatArgTest(ParsedFormat<T>*);
+
+template <auto T>
+std::false_type IsValidParsedFormatArgTest(...);
+
+template <auto T>
+using IsValidParsedFormatArg = decltype(IsValidParsedFormatArgTest<T>(nullptr));
+
+TEST_F(ParsedFormatTest, OnlyValidTypesAllowed) {
+ ASSERT_TRUE(IsValidParsedFormatArg<'c'>::value);
+
+ ASSERT_TRUE(IsValidParsedFormatArg<FormatConversionCharSet::d>::value);
+
+ ASSERT_TRUE(IsValidParsedFormatArg<absl::FormatConversionCharSet::d |
+ absl::FormatConversionCharSet::x>::value);
+ ASSERT_TRUE(
+ IsValidParsedFormatArg<absl::FormatConversionCharSet::kIntegral>::value);
+
+ // This is an easy mistake to make, however, this will reduce to an integer
+ // which has no meaning, so we need to ensure it doesn't compile.
+ ASSERT_FALSE(IsValidParsedFormatArg<'x' | 'd'>::value);
+
+ // For now, we disallow construction based on ConversionChar (rather than
+ // CharSet)
+ ASSERT_FALSE(IsValidParsedFormatArg<absl::FormatConversionChar::d>::value);
+}
+
+TEST_F(ParsedFormatTest, ExtendedTyping) {
+ EXPECT_FALSE(ParsedFormat<FormatConversionCharSet::d>::New(""));
+ ASSERT_TRUE(ParsedFormat<absl::FormatConversionCharSet::d>::New("%d"));
+ auto v1 = ParsedFormat<'d', absl::FormatConversionCharSet::s>::New("%d%s");
+ ASSERT_TRUE(v1);
+ auto v2 = ParsedFormat<absl::FormatConversionCharSet::d, 's'>::New("%d%s");
+ ASSERT_TRUE(v2);
+ auto v3 = ParsedFormat<absl::FormatConversionCharSet::d |
+ absl::FormatConversionCharSet::s,
+ 's'>::New("%d%s");
+ ASSERT_TRUE(v3);
+ auto v4 = ParsedFormat<absl::FormatConversionCharSet::d |
+ absl::FormatConversionCharSet::s,
+ 's'>::New("%s%s");
+ ASSERT_TRUE(v4);
+}
+#endif
+
+TEST_F(ParsedFormatTest, UncheckedCorrect) {
+ auto f =
+ ExtendedParsedFormat<absl::FormatConversionCharSet::d>::New("ABC%dDEF");
+ ASSERT_TRUE(f);
+ EXPECT_EQ("[ABC]{d:1$d}[DEF]", SummarizeParsedFormat(*f));
+
+ std::string format = "%sFFF%dZZZ%f";
+ auto f2 = ExtendedParsedFormat<
+ absl::FormatConversionCharSet::kString, absl::FormatConversionCharSet::d,
+ absl::FormatConversionCharSet::kFloating>::New(format);
+
+ ASSERT_TRUE(f2);
+ EXPECT_EQ("{s:1$s}[FFF]{d:2$d}[ZZZ]{f:3$f}", SummarizeParsedFormat(*f2));
+
+ f2 = ExtendedParsedFormat<
+ absl::FormatConversionCharSet::kString, absl::FormatConversionCharSet::d,
+ absl::FormatConversionCharSet::kFloating>::New("%s %d %f");
+
+ ASSERT_TRUE(f2);
+ EXPECT_EQ("{s:1$s}[ ]{d:2$d}[ ]{f:3$f}", SummarizeParsedFormat(*f2));
+
+ auto star =
+ ExtendedParsedFormat<absl::FormatConversionCharSet::kStar,
+ absl::FormatConversionCharSet::d>::New("%*d");
+ ASSERT_TRUE(star);
+ EXPECT_EQ("{*d:2$1$*d}", SummarizeParsedFormat(*star));
+
+ auto dollar =
+ ExtendedParsedFormat<absl::FormatConversionCharSet::d,
+ absl::FormatConversionCharSet::s>::New("%2$s %1$d");
+ ASSERT_TRUE(dollar);
+ EXPECT_EQ("{2$s:2$s}[ ]{1$d:1$d}", SummarizeParsedFormat(*dollar));
+ // with reuse
+ dollar = ExtendedParsedFormat<
+ absl::FormatConversionCharSet::d,
+ absl::FormatConversionCharSet::s>::New("%2$s %1$d %1$d");
+ ASSERT_TRUE(dollar);
+ EXPECT_EQ("{2$s:2$s}[ ]{1$d:1$d}[ ]{1$d:1$d}",
+ SummarizeParsedFormat(*dollar));
+}
+
+TEST_F(ParsedFormatTest, UncheckedIgnoredArgs) {
+ EXPECT_FALSE(
+ (ExtendedParsedFormat<absl::FormatConversionCharSet::d,
+ absl::FormatConversionCharSet::s>::New("ABC")));
+ EXPECT_FALSE(
+ (ExtendedParsedFormat<absl::FormatConversionCharSet::d,
+ absl::FormatConversionCharSet::s>::New("%dABC")));
+ EXPECT_FALSE(
+ (ExtendedParsedFormat<absl::FormatConversionCharSet::d,
+ absl::FormatConversionCharSet::s>::New("ABC%2$s")));
+ auto f = ExtendedParsedFormat<
+ absl::FormatConversionCharSet::d,
+ absl::FormatConversionCharSet::s>::NewAllowIgnored("ABC");
+ ASSERT_TRUE(f);
+ EXPECT_EQ("[ABC]", SummarizeParsedFormat(*f));
+ f = ExtendedParsedFormat<
+ absl::FormatConversionCharSet::d,
+ absl::FormatConversionCharSet::s>::NewAllowIgnored("%dABC");
+ ASSERT_TRUE(f);
+ EXPECT_EQ("{d:1$d}[ABC]", SummarizeParsedFormat(*f));
+ f = ExtendedParsedFormat<
+ absl::FormatConversionCharSet::d,
+ absl::FormatConversionCharSet::s>::NewAllowIgnored("ABC%2$s");
+ ASSERT_TRUE(f);
+ EXPECT_EQ("[ABC]{2$s:2$s}", SummarizeParsedFormat(*f));
+}
+
+TEST_F(ParsedFormatTest, UncheckedMultipleTypes) {
+ auto dx =
+ ExtendedParsedFormat<absl::FormatConversionCharSet::d |
+ absl::FormatConversionCharSet::x>::New("%1$d %1$x");
+ EXPECT_TRUE(dx);
+ EXPECT_EQ("{1$d:1$d}[ ]{1$x:1$x}", SummarizeParsedFormat(*dx));
+
+ dx = ExtendedParsedFormat<absl::FormatConversionCharSet::d |
+ absl::FormatConversionCharSet::x>::New("%1$d");
+ EXPECT_TRUE(dx);
+ EXPECT_EQ("{1$d:1$d}", SummarizeParsedFormat(*dx));
+}
+
+TEST_F(ParsedFormatTest, UncheckedIncorrect) {
+ EXPECT_FALSE(ExtendedParsedFormat<absl::FormatConversionCharSet::d>::New(""));
+
+ EXPECT_FALSE(ExtendedParsedFormat<absl::FormatConversionCharSet::d>::New(
+ "ABC%dDEF%d"));
+
+ std::string format = "%sFFF%dZZZ%f";
+ EXPECT_FALSE(
+ (ExtendedParsedFormat<absl::FormatConversionCharSet::s,
+ absl::FormatConversionCharSet::d,
+ absl::FormatConversionCharSet::g>::New(format)));
+}
+
+TEST_F(ParsedFormatTest, RegressionMixPositional) {
+ EXPECT_FALSE(
+ (ExtendedParsedFormat<absl::FormatConversionCharSet::d,
+ absl::FormatConversionCharSet::o>::New("%1$d %o")));
+}
+
+using FormatWrapperTest = ::testing::Test;
+
+// Plain wrapper for StrFormat.
+template <typename... Args>
+std::string WrappedFormat(const absl::FormatSpec<Args...>& format,
+ const Args&... args) {
+ return StrFormat(format, args...);
+}
+
+TEST_F(FormatWrapperTest, ConstexprStringFormat) {
+ EXPECT_EQ(WrappedFormat("%s there", "hello"), "hello there");
+}
+
+TEST_F(FormatWrapperTest, ParsedFormat) {
+ ParsedFormat<'s'> format("%s there");
+ EXPECT_EQ(WrappedFormat(format, "hello"), "hello there");
+}
+
+} // namespace
+ABSL_NAMESPACE_END
+} // namespace absl
+
+using FormatExtensionTest = ::testing::Test;
+
+struct Point {
+ friend absl::FormatConvertResult<absl::FormatConversionCharSet::kString |
+ absl::FormatConversionCharSet::kIntegral>
+ AbslFormatConvert(const Point& p, const absl::FormatConversionSpec& spec,
+ absl::FormatSink* s) {
+ if (spec.conversion_char() == absl::FormatConversionChar::s) {
+ s->Append(absl::StrCat("x=", p.x, " y=", p.y));
+ } else {
+ s->Append(absl::StrCat(p.x, ",", p.y));
+ }
+ return {true};
+ }
+
+ int x = 10;
+ int y = 20;
+};
+
+TEST_F(FormatExtensionTest, AbslFormatConvertExample) {
+ Point p;
+ EXPECT_EQ(absl::StrFormat("a %s z", p), "a x=10 y=20 z");
+ EXPECT_EQ(absl::StrFormat("a %d z", p), "a 10,20 z");
+
+ // Typed formatting will fail to compile an invalid format.
+ // StrFormat("%f", p); // Does not compile.
+ std::string actual;
+ absl::UntypedFormatSpec f1("%f");
+ // FormatUntyped will return false for bad character.
+ EXPECT_FALSE(absl::FormatUntyped(&actual, f1, {absl::FormatArg(p)}));
+}
+
+// Some codegen thunks that we can use to easily dump the generated assembly for
+// different StrFormat calls.
+
+std::string CodegenAbslStrFormatInt(int i) { // NOLINT
+ return absl::StrFormat("%d", i);
+}
+
+std::string CodegenAbslStrFormatIntStringInt64(int i, const std::string& s,
+ int64_t i64) { // NOLINT
+ return absl::StrFormat("%d %s %d", i, s, i64);
+}
+
+void CodegenAbslStrAppendFormatInt(std::string* out, int i) { // NOLINT
+ absl::StrAppendFormat(out, "%d", i);
+}
+
+void CodegenAbslStrAppendFormatIntStringInt64(std::string* out, int i,
+ const std::string& s,
+ int64_t i64) { // NOLINT
+ absl::StrAppendFormat(out, "%d %s %d", i, s, i64);
+}
diff --git a/third_party/abseil/src/absl/strings/str_join.h b/third_party/abseil/src/absl/strings/str_join.h
new file mode 100644
index 0000000..ae5731a
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/str_join.h
@@ -0,0 +1,293 @@
+//
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: str_join.h
+// -----------------------------------------------------------------------------
+//
+// This header file contains functions for joining a range of elements and
+// returning the result as a std::string. StrJoin operations are specified by
+// passing a range, a separator string to use between the elements joined, and
+// an optional Formatter responsible for converting each argument in the range
+// to a string. If omitted, a default `AlphaNumFormatter()` is called on the
+// elements to be joined, using the same formatting that `absl::StrCat()` uses.
+// This package defines a number of default formatters, and you can define your
+// own implementations.
+//
+// Ranges are specified by passing a container with `std::begin()` and
+// `std::end()` iterators, container-specific `begin()` and `end()` iterators, a
+// brace-initialized `std::initializer_list`, or a `std::tuple` of heterogeneous
+// objects. The separator string is specified as an `absl::string_view`.
+//
+// Because the default formatter uses the `absl::AlphaNum` class,
+// `absl::StrJoin()`, like `absl::StrCat()`, will work out-of-the-box on
+// collections of strings, ints, floats, doubles, etc.
+//
+// Example:
+//
+// std::vector<std::string> v = {"foo", "bar", "baz"};
+// std::string s = absl::StrJoin(v, "-");
+// EXPECT_EQ("foo-bar-baz", s);
+//
+// See comments on the `absl::StrJoin()` function for more examples.
+
+#ifndef ABSL_STRINGS_STR_JOIN_H_
+#define ABSL_STRINGS_STR_JOIN_H_
+
+#include <cstdio>
+#include <cstring>
+#include <initializer_list>
+#include <iterator>
+#include <string>
+#include <tuple>
+#include <type_traits>
+#include <utility>
+
+#include "absl/base/macros.h"
+#include "absl/strings/internal/str_join_internal.h"
+#include "absl/strings/string_view.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+// -----------------------------------------------------------------------------
+// Concept: Formatter
+// -----------------------------------------------------------------------------
+//
+// A Formatter is a function object that is responsible for formatting its
+// argument as a string and appending it to a given output std::string.
+// Formatters may be implemented as function objects, lambdas, or normal
+// functions. You may provide your own Formatter to enable `absl::StrJoin()` to
+// work with arbitrary types.
+//
+// The following is an example of a custom Formatter that simply uses
+// `std::to_string()` to format an integer as a std::string.
+//
+// struct MyFormatter {
+// void operator()(std::string* out, int i) const {
+// out->append(std::to_string(i));
+// }
+// };
+//
+// You would use the above formatter by passing an instance of it as the final
+// argument to `absl::StrJoin()`:
+//
+// std::vector<int> v = {1, 2, 3, 4};
+// std::string s = absl::StrJoin(v, "-", MyFormatter());
+// EXPECT_EQ("1-2-3-4", s);
+//
+// The following standard formatters are provided within this file:
+//
+// - `AlphaNumFormatter()` (the default)
+// - `StreamFormatter()`
+// - `PairFormatter()`
+// - `DereferenceFormatter()`
+
+// AlphaNumFormatter()
+//
+// Default formatter used if none is specified. Uses `absl::AlphaNum` to convert
+// numeric arguments to strings.
+inline strings_internal::AlphaNumFormatterImpl AlphaNumFormatter() {
+ return strings_internal::AlphaNumFormatterImpl();
+}
+
+// StreamFormatter()
+//
+// Formats its argument using the << operator.
+inline strings_internal::StreamFormatterImpl StreamFormatter() {
+ return strings_internal::StreamFormatterImpl();
+}
+
+// Function Template: PairFormatter(Formatter, absl::string_view, Formatter)
+//
+// Formats a `std::pair` by putting a given separator between the pair's
+// `.first` and `.second` members. This formatter allows you to specify
+// custom Formatters for both the first and second member of each pair.
+template <typename FirstFormatter, typename SecondFormatter>
+inline strings_internal::PairFormatterImpl<FirstFormatter, SecondFormatter>
+PairFormatter(FirstFormatter f1, absl::string_view sep, SecondFormatter f2) {
+ return strings_internal::PairFormatterImpl<FirstFormatter, SecondFormatter>(
+ std::move(f1), sep, std::move(f2));
+}
+
+// Function overload of PairFormatter() for using a default
+// `AlphaNumFormatter()` for each Formatter in the pair.
+inline strings_internal::PairFormatterImpl<
+ strings_internal::AlphaNumFormatterImpl,
+ strings_internal::AlphaNumFormatterImpl>
+PairFormatter(absl::string_view sep) {
+ return PairFormatter(AlphaNumFormatter(), sep, AlphaNumFormatter());
+}
+
+// Function Template: DereferenceFormatter(Formatter)
+//
+// Formats its argument by dereferencing it and then applying the given
+// formatter. This formatter is useful for formatting a container of
+// pointer-to-T. This pattern often shows up when joining repeated fields in
+// protocol buffers.
+template <typename Formatter>
+strings_internal::DereferenceFormatterImpl<Formatter> DereferenceFormatter(
+ Formatter&& f) {
+ return strings_internal::DereferenceFormatterImpl<Formatter>(
+ std::forward<Formatter>(f));
+}
+
+// Function overload of `DererefenceFormatter()` for using a default
+// `AlphaNumFormatter()`.
+inline strings_internal::DereferenceFormatterImpl<
+ strings_internal::AlphaNumFormatterImpl>
+DereferenceFormatter() {
+ return strings_internal::DereferenceFormatterImpl<
+ strings_internal::AlphaNumFormatterImpl>(AlphaNumFormatter());
+}
+
+// -----------------------------------------------------------------------------
+// StrJoin()
+// -----------------------------------------------------------------------------
+//
+// Joins a range of elements and returns the result as a std::string.
+// `absl::StrJoin()` takes a range, a separator string to use between the
+// elements joined, and an optional Formatter responsible for converting each
+// argument in the range to a string.
+//
+// If omitted, the default `AlphaNumFormatter()` is called on the elements to be
+// joined.
+//
+// Example 1:
+// // Joins a collection of strings. This pattern also works with a collection
+// // of `absl::string_view` or even `const char*`.
+// std::vector<std::string> v = {"foo", "bar", "baz"};
+// std::string s = absl::StrJoin(v, "-");
+// EXPECT_EQ("foo-bar-baz", s);
+//
+// Example 2:
+// // Joins the values in the given `std::initializer_list<>` specified using
+// // brace initialization. This pattern also works with an initializer_list
+// // of ints or `absl::string_view` -- any `AlphaNum`-compatible type.
+// std::string s = absl::StrJoin({"foo", "bar", "baz"}, "-");
+// EXPECT_EQ("foo-bar-baz", s);
+//
+// Example 3:
+// // Joins a collection of ints. This pattern also works with floats,
+// // doubles, int64s -- any `StrCat()`-compatible type.
+// std::vector<int> v = {1, 2, 3, -4};
+// std::string s = absl::StrJoin(v, "-");
+// EXPECT_EQ("1-2-3--4", s);
+//
+// Example 4:
+// // Joins a collection of pointer-to-int. By default, pointers are
+// // dereferenced and the pointee is formatted using the default format for
+// // that type; such dereferencing occurs for all levels of indirection, so
+// // this pattern works just as well for `std::vector<int**>` as for
+// // `std::vector<int*>`.
+// int x = 1, y = 2, z = 3;
+// std::vector<int*> v = {&x, &y, &z};
+// std::string s = absl::StrJoin(v, "-");
+// EXPECT_EQ("1-2-3", s);
+//
+// Example 5:
+// // Dereferencing of `std::unique_ptr<>` is also supported:
+// std::vector<std::unique_ptr<int>> v
+// v.emplace_back(new int(1));
+// v.emplace_back(new int(2));
+// v.emplace_back(new int(3));
+// std::string s = absl::StrJoin(v, "-");
+// EXPECT_EQ("1-2-3", s);
+//
+// Example 6:
+// // Joins a `std::map`, with each key-value pair separated by an equals
+// // sign. This pattern would also work with, say, a
+// // `std::vector<std::pair<>>`.
+// std::map<std::string, int> m = {
+// std::make_pair("a", 1),
+// std::make_pair("b", 2),
+// std::make_pair("c", 3)};
+// std::string s = absl::StrJoin(m, ",", absl::PairFormatter("="));
+// EXPECT_EQ("a=1,b=2,c=3", s);
+//
+// Example 7:
+// // These examples show how `absl::StrJoin()` handles a few common edge
+// // cases:
+// std::vector<std::string> v_empty;
+// EXPECT_EQ("", absl::StrJoin(v_empty, "-"));
+//
+// std::vector<std::string> v_one_item = {"foo"};
+// EXPECT_EQ("foo", absl::StrJoin(v_one_item, "-"));
+//
+// std::vector<std::string> v_empty_string = {""};
+// EXPECT_EQ("", absl::StrJoin(v_empty_string, "-"));
+//
+// std::vector<std::string> v_one_item_empty_string = {"a", ""};
+// EXPECT_EQ("a-", absl::StrJoin(v_one_item_empty_string, "-"));
+//
+// std::vector<std::string> v_two_empty_string = {"", ""};
+// EXPECT_EQ("-", absl::StrJoin(v_two_empty_string, "-"));
+//
+// Example 8:
+// // Joins a `std::tuple<T...>` of heterogeneous types, converting each to
+// // a std::string using the `absl::AlphaNum` class.
+// std::string s = absl::StrJoin(std::make_tuple(123, "abc", 0.456), "-");
+// EXPECT_EQ("123-abc-0.456", s);
+
+template <typename Iterator, typename Formatter>
+std::string StrJoin(Iterator start, Iterator end, absl::string_view sep,
+ Formatter&& fmt) {
+ return strings_internal::JoinAlgorithm(start, end, sep, fmt);
+}
+
+template <typename Range, typename Formatter>
+std::string StrJoin(const Range& range, absl::string_view separator,
+ Formatter&& fmt) {
+ return strings_internal::JoinRange(range, separator, fmt);
+}
+
+template <typename T, typename Formatter>
+std::string StrJoin(std::initializer_list<T> il, absl::string_view separator,
+ Formatter&& fmt) {
+ return strings_internal::JoinRange(il, separator, fmt);
+}
+
+template <typename... T, typename Formatter>
+std::string StrJoin(const std::tuple<T...>& value, absl::string_view separator,
+ Formatter&& fmt) {
+ return strings_internal::JoinAlgorithm(value, separator, fmt);
+}
+
+template <typename Iterator>
+std::string StrJoin(Iterator start, Iterator end, absl::string_view separator) {
+ return strings_internal::JoinRange(start, end, separator);
+}
+
+template <typename Range>
+std::string StrJoin(const Range& range, absl::string_view separator) {
+ return strings_internal::JoinRange(range, separator);
+}
+
+template <typename T>
+std::string StrJoin(std::initializer_list<T> il,
+ absl::string_view separator) {
+ return strings_internal::JoinRange(il, separator);
+}
+
+template <typename... T>
+std::string StrJoin(const std::tuple<T...>& value,
+ absl::string_view separator) {
+ return strings_internal::JoinAlgorithm(value, separator, AlphaNumFormatter());
+}
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_STRINGS_STR_JOIN_H_
diff --git a/third_party/abseil/src/absl/strings/str_join_benchmark.cc b/third_party/abseil/src/absl/strings/str_join_benchmark.cc
new file mode 100644
index 0000000..d6f689f
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/str_join_benchmark.cc
@@ -0,0 +1,97 @@
+//
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/strings/str_join.h"
+
+#include <string>
+#include <vector>
+#include <utility>
+
+#include "benchmark/benchmark.h"
+
+namespace {
+
+void BM_Join2_Strings(benchmark::State& state) {
+ const int string_len = state.range(0);
+ const int num_strings = state.range(1);
+ const std::string s(string_len, 'x');
+ const std::vector<std::string> v(num_strings, s);
+ for (auto _ : state) {
+ std::string s = absl::StrJoin(v, "-");
+ benchmark::DoNotOptimize(s);
+ }
+}
+BENCHMARK(BM_Join2_Strings)
+ ->ArgPair(1 << 0, 1 << 3)
+ ->ArgPair(1 << 10, 1 << 3)
+ ->ArgPair(1 << 13, 1 << 3)
+ ->ArgPair(1 << 0, 1 << 10)
+ ->ArgPair(1 << 10, 1 << 10)
+ ->ArgPair(1 << 13, 1 << 10)
+ ->ArgPair(1 << 0, 1 << 13)
+ ->ArgPair(1 << 10, 1 << 13)
+ ->ArgPair(1 << 13, 1 << 13);
+
+void BM_Join2_Ints(benchmark::State& state) {
+ const int num_ints = state.range(0);
+ const std::vector<int> v(num_ints, 42);
+ for (auto _ : state) {
+ std::string s = absl::StrJoin(v, "-");
+ benchmark::DoNotOptimize(s);
+ }
+}
+BENCHMARK(BM_Join2_Ints)->Range(0, 1 << 13);
+
+void BM_Join2_KeysAndValues(benchmark::State& state) {
+ const int string_len = state.range(0);
+ const int num_pairs = state.range(1);
+ const std::string s(string_len, 'x');
+ const std::vector<std::pair<std::string, int>> v(num_pairs,
+ std::make_pair(s, 42));
+ for (auto _ : state) {
+ std::string s = absl::StrJoin(v, ",", absl::PairFormatter("="));
+ benchmark::DoNotOptimize(s);
+ }
+}
+BENCHMARK(BM_Join2_KeysAndValues)
+ ->ArgPair(1 << 0, 1 << 3)
+ ->ArgPair(1 << 10, 1 << 3)
+ ->ArgPair(1 << 13, 1 << 3)
+ ->ArgPair(1 << 0, 1 << 10)
+ ->ArgPair(1 << 10, 1 << 10)
+ ->ArgPair(1 << 13, 1 << 10)
+ ->ArgPair(1 << 0, 1 << 13)
+ ->ArgPair(1 << 10, 1 << 13)
+ ->ArgPair(1 << 13, 1 << 13);
+
+void BM_JoinStreamable(benchmark::State& state) {
+ const int string_len = state.range(0);
+ const int num_strings = state.range(1);
+ const std::vector<std::string> v(num_strings, std::string(string_len, 'x'));
+ for (auto _ : state) {
+ std::string s = absl::StrJoin(v, "", absl::StreamFormatter());
+ benchmark::DoNotOptimize(s);
+ }
+}
+BENCHMARK(BM_JoinStreamable)
+ ->ArgPair(0, 0)
+ ->ArgPair(16, 1)
+ ->ArgPair(256, 1)
+ ->ArgPair(16, 16)
+ ->ArgPair(256, 16)
+ ->ArgPair(16, 256)
+ ->ArgPair(256, 256);
+
+} // namespace
diff --git a/third_party/abseil/src/absl/strings/str_join_test.cc b/third_party/abseil/src/absl/strings/str_join_test.cc
new file mode 100644
index 0000000..2be6256
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/str_join_test.cc
@@ -0,0 +1,474 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Unit tests for all join.h functions
+
+#include "absl/strings/str_join.h"
+
+#include <cstddef>
+#include <cstdint>
+#include <cstdio>
+#include <functional>
+#include <initializer_list>
+#include <map>
+#include <memory>
+#include <ostream>
+#include <tuple>
+#include <type_traits>
+#include <vector>
+
+#include "gtest/gtest.h"
+#include "absl/base/macros.h"
+#include "absl/memory/memory.h"
+#include "absl/strings/str_cat.h"
+#include "absl/strings/str_split.h"
+
+namespace {
+
+TEST(StrJoin, APIExamples) {
+ {
+ // Collection of strings
+ std::vector<std::string> v = {"foo", "bar", "baz"};
+ EXPECT_EQ("foo-bar-baz", absl::StrJoin(v, "-"));
+ }
+
+ {
+ // Collection of absl::string_view
+ std::vector<absl::string_view> v = {"foo", "bar", "baz"};
+ EXPECT_EQ("foo-bar-baz", absl::StrJoin(v, "-"));
+ }
+
+ {
+ // Collection of const char*
+ std::vector<const char*> v = {"foo", "bar", "baz"};
+ EXPECT_EQ("foo-bar-baz", absl::StrJoin(v, "-"));
+ }
+
+ {
+ // Collection of non-const char*
+ std::string a = "foo", b = "bar", c = "baz";
+ std::vector<char*> v = {&a[0], &b[0], &c[0]};
+ EXPECT_EQ("foo-bar-baz", absl::StrJoin(v, "-"));
+ }
+
+ {
+ // Collection of ints
+ std::vector<int> v = {1, 2, 3, -4};
+ EXPECT_EQ("1-2-3--4", absl::StrJoin(v, "-"));
+ }
+
+ {
+ // Literals passed as a std::initializer_list
+ std::string s = absl::StrJoin({"a", "b", "c"}, "-");
+ EXPECT_EQ("a-b-c", s);
+ }
+ {
+ // Join a std::tuple<T...>.
+ std::string s = absl::StrJoin(std::make_tuple(123, "abc", 0.456), "-");
+ EXPECT_EQ("123-abc-0.456", s);
+ }
+
+ {
+ // Collection of unique_ptrs
+ std::vector<std::unique_ptr<int>> v;
+ v.emplace_back(new int(1));
+ v.emplace_back(new int(2));
+ v.emplace_back(new int(3));
+ EXPECT_EQ("1-2-3", absl::StrJoin(v, "-"));
+ }
+
+ {
+ // Array of ints
+ const int a[] = {1, 2, 3, -4};
+ EXPECT_EQ("1-2-3--4", absl::StrJoin(a, a + ABSL_ARRAYSIZE(a), "-"));
+ }
+
+ {
+ // Collection of pointers
+ int x = 1, y = 2, z = 3;
+ std::vector<int*> v = {&x, &y, &z};
+ EXPECT_EQ("1-2-3", absl::StrJoin(v, "-"));
+ }
+
+ {
+ // Collection of pointers to pointers
+ int x = 1, y = 2, z = 3;
+ int *px = &x, *py = &y, *pz = &z;
+ std::vector<int**> v = {&px, &py, &pz};
+ EXPECT_EQ("1-2-3", absl::StrJoin(v, "-"));
+ }
+
+ {
+ // Collection of pointers to std::string
+ std::string a("a"), b("b");
+ std::vector<std::string*> v = {&a, &b};
+ EXPECT_EQ("a-b", absl::StrJoin(v, "-"));
+ }
+
+ {
+ // A std::map, which is a collection of std::pair<>s.
+ std::map<std::string, int> m = {{"a", 1}, {"b", 2}, {"c", 3}};
+ EXPECT_EQ("a=1,b=2,c=3", absl::StrJoin(m, ",", absl::PairFormatter("=")));
+ }
+
+ {
+ // Shows absl::StrSplit and absl::StrJoin working together. This example is
+ // equivalent to s/=/-/g.
+ const std::string s = "a=b=c=d";
+ EXPECT_EQ("a-b-c-d", absl::StrJoin(absl::StrSplit(s, "="), "-"));
+ }
+
+ //
+ // A few examples of edge cases
+ //
+
+ {
+ // Empty range yields an empty string.
+ std::vector<std::string> v;
+ EXPECT_EQ("", absl::StrJoin(v, "-"));
+ }
+
+ {
+ // A range of 1 element gives a string with that element but no
+ // separator.
+ std::vector<std::string> v = {"foo"};
+ EXPECT_EQ("foo", absl::StrJoin(v, "-"));
+ }
+
+ {
+ // A range with a single empty string element
+ std::vector<std::string> v = {""};
+ EXPECT_EQ("", absl::StrJoin(v, "-"));
+ }
+
+ {
+ // A range with 2 elements, one of which is an empty string
+ std::vector<std::string> v = {"a", ""};
+ EXPECT_EQ("a-", absl::StrJoin(v, "-"));
+ }
+
+ {
+ // A range with 2 empty elements.
+ std::vector<std::string> v = {"", ""};
+ EXPECT_EQ("-", absl::StrJoin(v, "-"));
+ }
+
+ {
+ // A std::vector of bool.
+ std::vector<bool> v = {true, false, true};
+ EXPECT_EQ("1-0-1", absl::StrJoin(v, "-"));
+ }
+}
+
+TEST(StrJoin, CustomFormatter) {
+ std::vector<std::string> v{"One", "Two", "Three"};
+ {
+ std::string joined =
+ absl::StrJoin(v, "", [](std::string* out, const std::string& in) {
+ absl::StrAppend(out, "(", in, ")");
+ });
+ EXPECT_EQ("(One)(Two)(Three)", joined);
+ }
+ {
+ class ImmovableFormatter {
+ public:
+ void operator()(std::string* out, const std::string& in) {
+ absl::StrAppend(out, "(", in, ")");
+ }
+ ImmovableFormatter() {}
+ ImmovableFormatter(const ImmovableFormatter&) = delete;
+ };
+ EXPECT_EQ("(One)(Two)(Three)", absl::StrJoin(v, "", ImmovableFormatter()));
+ }
+ {
+ class OverloadedFormatter {
+ public:
+ void operator()(std::string* out, const std::string& in) {
+ absl::StrAppend(out, "(", in, ")");
+ }
+ void operator()(std::string* out, const std::string& in) const {
+ absl::StrAppend(out, "[", in, "]");
+ }
+ };
+ EXPECT_EQ("(One)(Two)(Three)", absl::StrJoin(v, "", OverloadedFormatter()));
+ const OverloadedFormatter fmt = {};
+ EXPECT_EQ("[One][Two][Three]", absl::StrJoin(v, "", fmt));
+ }
+}
+
+//
+// Tests the Formatters
+//
+
+TEST(AlphaNumFormatter, FormatterAPI) {
+ // Not an exhaustive test. See strings/strcat_test.h for the exhaustive test
+ // of what AlphaNum can convert.
+ auto f = absl::AlphaNumFormatter();
+ std::string s;
+ f(&s, "Testing: ");
+ f(&s, static_cast<int>(1));
+ f(&s, static_cast<int16_t>(2));
+ f(&s, static_cast<int64_t>(3));
+ f(&s, static_cast<float>(4));
+ f(&s, static_cast<double>(5));
+ f(&s, static_cast<unsigned>(6));
+ f(&s, static_cast<size_t>(7));
+ f(&s, absl::string_view(" OK"));
+ EXPECT_EQ("Testing: 1234567 OK", s);
+}
+
+// Make sure people who are mistakenly using std::vector<bool> even though
+// they're not memory-constrained can use absl::AlphaNumFormatter().
+TEST(AlphaNumFormatter, VectorOfBool) {
+ auto f = absl::AlphaNumFormatter();
+ std::string s;
+ std::vector<bool> v = {true, false, true};
+ f(&s, *v.cbegin());
+ f(&s, *v.begin());
+ f(&s, v[1]);
+ EXPECT_EQ("110", s);
+}
+
+TEST(AlphaNumFormatter, AlphaNum) {
+ auto f = absl::AlphaNumFormatter();
+ std::string s;
+ f(&s, absl::AlphaNum("hello"));
+ EXPECT_EQ("hello", s);
+}
+
+struct StreamableType {
+ std::string contents;
+};
+inline std::ostream& operator<<(std::ostream& os, const StreamableType& t) {
+ os << "Streamable:" << t.contents;
+ return os;
+}
+
+TEST(StreamFormatter, FormatterAPI) {
+ auto f = absl::StreamFormatter();
+ std::string s;
+ f(&s, "Testing: ");
+ f(&s, static_cast<int>(1));
+ f(&s, static_cast<int16_t>(2));
+ f(&s, static_cast<int64_t>(3));
+ f(&s, static_cast<float>(4));
+ f(&s, static_cast<double>(5));
+ f(&s, static_cast<unsigned>(6));
+ f(&s, static_cast<size_t>(7));
+ f(&s, absl::string_view(" OK "));
+ StreamableType streamable = {"object"};
+ f(&s, streamable);
+ EXPECT_EQ("Testing: 1234567 OK Streamable:object", s);
+}
+
+// A dummy formatter that wraps each element in parens. Used in some tests
+// below.
+struct TestingParenFormatter {
+ template <typename T>
+ void operator()(std::string* s, const T& t) {
+ absl::StrAppend(s, "(", t, ")");
+ }
+};
+
+TEST(PairFormatter, FormatterAPI) {
+ {
+ // Tests default PairFormatter(sep) that uses AlphaNumFormatter for the
+ // 'first' and 'second' members.
+ const auto f = absl::PairFormatter("=");
+ std::string s;
+ f(&s, std::make_pair("a", "b"));
+ f(&s, std::make_pair(1, 2));
+ EXPECT_EQ("a=b1=2", s);
+ }
+
+ {
+ // Tests using a custom formatter for the 'first' and 'second' members.
+ auto f = absl::PairFormatter(TestingParenFormatter(), "=",
+ TestingParenFormatter());
+ std::string s;
+ f(&s, std::make_pair("a", "b"));
+ f(&s, std::make_pair(1, 2));
+ EXPECT_EQ("(a)=(b)(1)=(2)", s);
+ }
+}
+
+TEST(DereferenceFormatter, FormatterAPI) {
+ {
+ // Tests wrapping the default AlphaNumFormatter.
+ const absl::strings_internal::DereferenceFormatterImpl<
+ absl::strings_internal::AlphaNumFormatterImpl>
+ f;
+ int x = 1, y = 2, z = 3;
+ std::string s;
+ f(&s, &x);
+ f(&s, &y);
+ f(&s, &z);
+ EXPECT_EQ("123", s);
+ }
+
+ {
+ // Tests wrapping std::string's default formatter.
+ absl::strings_internal::DereferenceFormatterImpl<
+ absl::strings_internal::DefaultFormatter<std::string>::Type>
+ f;
+
+ std::string x = "x";
+ std::string y = "y";
+ std::string z = "z";
+ std::string s;
+ f(&s, &x);
+ f(&s, &y);
+ f(&s, &z);
+ EXPECT_EQ(s, "xyz");
+ }
+
+ {
+ // Tests wrapping a custom formatter.
+ auto f = absl::DereferenceFormatter(TestingParenFormatter());
+ int x = 1, y = 2, z = 3;
+ std::string s;
+ f(&s, &x);
+ f(&s, &y);
+ f(&s, &z);
+ EXPECT_EQ("(1)(2)(3)", s);
+ }
+
+ {
+ absl::strings_internal::DereferenceFormatterImpl<
+ absl::strings_internal::AlphaNumFormatterImpl>
+ f;
+ auto x = std::unique_ptr<int>(new int(1));
+ auto y = std::unique_ptr<int>(new int(2));
+ auto z = std::unique_ptr<int>(new int(3));
+ std::string s;
+ f(&s, x);
+ f(&s, y);
+ f(&s, z);
+ EXPECT_EQ("123", s);
+ }
+}
+
+//
+// Tests the interfaces for the 4 public Join function overloads. The semantics
+// of the algorithm is covered in the above APIExamples test.
+//
+TEST(StrJoin, PublicAPIOverloads) {
+ std::vector<std::string> v = {"a", "b", "c"};
+
+ // Iterators + formatter
+ EXPECT_EQ("a-b-c",
+ absl::StrJoin(v.begin(), v.end(), "-", absl::AlphaNumFormatter()));
+ // Range + formatter
+ EXPECT_EQ("a-b-c", absl::StrJoin(v, "-", absl::AlphaNumFormatter()));
+ // Iterators, no formatter
+ EXPECT_EQ("a-b-c", absl::StrJoin(v.begin(), v.end(), "-"));
+ // Range, no formatter
+ EXPECT_EQ("a-b-c", absl::StrJoin(v, "-"));
+}
+
+TEST(StrJoin, Array) {
+ const absl::string_view a[] = {"a", "b", "c"};
+ EXPECT_EQ("a-b-c", absl::StrJoin(a, "-"));
+}
+
+TEST(StrJoin, InitializerList) {
+ { EXPECT_EQ("a-b-c", absl::StrJoin({"a", "b", "c"}, "-")); }
+
+ {
+ auto a = {"a", "b", "c"};
+ EXPECT_EQ("a-b-c", absl::StrJoin(a, "-"));
+ }
+
+ {
+ std::initializer_list<const char*> a = {"a", "b", "c"};
+ EXPECT_EQ("a-b-c", absl::StrJoin(a, "-"));
+ }
+
+ {
+ std::initializer_list<std::string> a = {"a", "b", "c"};
+ EXPECT_EQ("a-b-c", absl::StrJoin(a, "-"));
+ }
+
+ {
+ std::initializer_list<absl::string_view> a = {"a", "b", "c"};
+ EXPECT_EQ("a-b-c", absl::StrJoin(a, "-"));
+ }
+
+ {
+ // Tests initializer_list with a non-default formatter
+ auto a = {"a", "b", "c"};
+ TestingParenFormatter f;
+ EXPECT_EQ("(a)-(b)-(c)", absl::StrJoin(a, "-", f));
+ }
+
+ {
+ // initializer_list of ints
+ EXPECT_EQ("1-2-3", absl::StrJoin({1, 2, 3}, "-"));
+ }
+
+ {
+ // Tests initializer_list of ints with a non-default formatter
+ auto a = {1, 2, 3};
+ TestingParenFormatter f;
+ EXPECT_EQ("(1)-(2)-(3)", absl::StrJoin(a, "-", f));
+ }
+}
+
+TEST(StrJoin, Tuple) {
+ EXPECT_EQ("", absl::StrJoin(std::make_tuple(), "-"));
+ EXPECT_EQ("hello", absl::StrJoin(std::make_tuple("hello"), "-"));
+
+ int x(10);
+ std::string y("hello");
+ double z(3.14);
+ EXPECT_EQ("10-hello-3.14", absl::StrJoin(std::make_tuple(x, y, z), "-"));
+
+ // Faster! Faster!!
+ EXPECT_EQ("10-hello-3.14",
+ absl::StrJoin(std::make_tuple(x, std::cref(y), z), "-"));
+
+ struct TestFormatter {
+ char buffer[128];
+ void operator()(std::string* out, int v) {
+ snprintf(buffer, sizeof(buffer), "%#.8x", v);
+ out->append(buffer);
+ }
+ void operator()(std::string* out, double v) {
+ snprintf(buffer, sizeof(buffer), "%#.0f", v);
+ out->append(buffer);
+ }
+ void operator()(std::string* out, const std::string& v) {
+ snprintf(buffer, sizeof(buffer), "%.4s", v.c_str());
+ out->append(buffer);
+ }
+ };
+ EXPECT_EQ("0x0000000a-hell-3.",
+ absl::StrJoin(std::make_tuple(x, y, z), "-", TestFormatter()));
+ EXPECT_EQ(
+ "0x0000000a-hell-3.",
+ absl::StrJoin(std::make_tuple(x, std::cref(y), z), "-", TestFormatter()));
+ EXPECT_EQ("0x0000000a-hell-3.",
+ absl::StrJoin(std::make_tuple(&x, &y, &z), "-",
+ absl::DereferenceFormatter(TestFormatter())));
+ EXPECT_EQ("0x0000000a-hell-3.",
+ absl::StrJoin(std::make_tuple(absl::make_unique<int>(x),
+ absl::make_unique<std::string>(y),
+ absl::make_unique<double>(z)),
+ "-", absl::DereferenceFormatter(TestFormatter())));
+ EXPECT_EQ("0x0000000a-hell-3.",
+ absl::StrJoin(std::make_tuple(absl::make_unique<int>(x), &y, &z),
+ "-", absl::DereferenceFormatter(TestFormatter())));
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/strings/str_replace.cc b/third_party/abseil/src/absl/strings/str_replace.cc
new file mode 100644
index 0000000..2bd5fa9
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/str_replace.cc
@@ -0,0 +1,82 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/strings/str_replace.h"
+
+#include "absl/strings/str_cat.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace strings_internal {
+
+using FixedMapping =
+ std::initializer_list<std::pair<absl::string_view, absl::string_view>>;
+
+// Applies the ViableSubstitutions in subs_ptr to the absl::string_view s, and
+// stores the result in *result_ptr. Returns the number of substitutions that
+// occurred.
+int ApplySubstitutions(
+ absl::string_view s,
+ std::vector<strings_internal::ViableSubstitution>* subs_ptr,
+ std::string* result_ptr) {
+ auto& subs = *subs_ptr;
+ int substitutions = 0;
+ size_t pos = 0;
+ while (!subs.empty()) {
+ auto& sub = subs.back();
+ if (sub.offset >= pos) {
+ if (pos <= s.size()) {
+ StrAppend(result_ptr, s.substr(pos, sub.offset - pos), sub.replacement);
+ }
+ pos = sub.offset + sub.old.size();
+ substitutions += 1;
+ }
+ sub.offset = s.find(sub.old, pos);
+ if (sub.offset == s.npos) {
+ subs.pop_back();
+ } else {
+ // Insertion sort to ensure the last ViableSubstitution continues to be
+ // before all the others.
+ size_t index = subs.size();
+ while (--index && subs[index - 1].OccursBefore(subs[index])) {
+ std::swap(subs[index], subs[index - 1]);
+ }
+ }
+ }
+ result_ptr->append(s.data() + pos, s.size() - pos);
+ return substitutions;
+}
+
+} // namespace strings_internal
+
+// We can implement this in terms of the generic StrReplaceAll, but
+// we must specify the template overload because C++ cannot deduce the type
+// of an initializer_list parameter to a function, and also if we don't specify
+// the type, we just call ourselves.
+//
+// Note that we implement them here, rather than in the header, so that they
+// aren't inlined.
+
+std::string StrReplaceAll(absl::string_view s,
+ strings_internal::FixedMapping replacements) {
+ return StrReplaceAll<strings_internal::FixedMapping>(s, replacements);
+}
+
+int StrReplaceAll(strings_internal::FixedMapping replacements,
+ std::string* target) {
+ return StrReplaceAll<strings_internal::FixedMapping>(replacements, target);
+}
+
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/strings/str_replace.h b/third_party/abseil/src/absl/strings/str_replace.h
new file mode 100644
index 0000000..273c707
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/str_replace.h
@@ -0,0 +1,219 @@
+//
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: str_replace.h
+// -----------------------------------------------------------------------------
+//
+// This file defines `absl::StrReplaceAll()`, a general-purpose string
+// replacement function designed for large, arbitrary text substitutions,
+// especially on strings which you are receiving from some other system for
+// further processing (e.g. processing regular expressions, escaping HTML
+// entities, etc.). `StrReplaceAll` is designed to be efficient even when only
+// one substitution is being performed, or when substitution is rare.
+//
+// If the string being modified is known at compile-time, and the substitutions
+// vary, `absl::Substitute()` may be a better choice.
+//
+// Example:
+//
+// std::string html_escaped = absl::StrReplaceAll(user_input, {
+// {"&", "&"},
+// {"<", "<"},
+// {">", ">"},
+// {"\"", """},
+// {"'", "'"}});
+#ifndef ABSL_STRINGS_STR_REPLACE_H_
+#define ABSL_STRINGS_STR_REPLACE_H_
+
+#include <string>
+#include <utility>
+#include <vector>
+
+#include "absl/base/attributes.h"
+#include "absl/strings/string_view.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+// StrReplaceAll()
+//
+// Replaces character sequences within a given string with replacements provided
+// within an initializer list of key/value pairs. Candidate replacements are
+// considered in order as they occur within the string, with earlier matches
+// taking precedence, and longer matches taking precedence for candidates
+// starting at the same position in the string. Once a substitution is made, the
+// replaced text is not considered for any further substitutions.
+//
+// Example:
+//
+// std::string s = absl::StrReplaceAll(
+// "$who bought $count #Noun. Thanks $who!",
+// {{"$count", absl::StrCat(5)},
+// {"$who", "Bob"},
+// {"#Noun", "Apples"}});
+// EXPECT_EQ("Bob bought 5 Apples. Thanks Bob!", s);
+ABSL_MUST_USE_RESULT std::string StrReplaceAll(
+ absl::string_view s,
+ std::initializer_list<std::pair<absl::string_view, absl::string_view>>
+ replacements);
+
+// Overload of `StrReplaceAll()` to accept a container of key/value replacement
+// pairs (typically either an associative map or a `std::vector` of `std::pair`
+// elements). A vector of pairs is generally more efficient.
+//
+// Examples:
+//
+// std::map<const absl::string_view, const absl::string_view> replacements;
+// replacements["$who"] = "Bob";
+// replacements["$count"] = "5";
+// replacements["#Noun"] = "Apples";
+// std::string s = absl::StrReplaceAll(
+// "$who bought $count #Noun. Thanks $who!",
+// replacements);
+// EXPECT_EQ("Bob bought 5 Apples. Thanks Bob!", s);
+//
+// // A std::vector of std::pair elements can be more efficient.
+// std::vector<std::pair<const absl::string_view, std::string>> replacements;
+// replacements.push_back({"&", "&"});
+// replacements.push_back({"<", "<"});
+// replacements.push_back({">", ">"});
+// std::string s = absl::StrReplaceAll("if (ptr < &foo)",
+// replacements);
+// EXPECT_EQ("if (ptr < &foo)", s);
+template <typename StrToStrMapping>
+std::string StrReplaceAll(absl::string_view s,
+ const StrToStrMapping& replacements);
+
+// Overload of `StrReplaceAll()` to replace character sequences within a given
+// output string *in place* with replacements provided within an initializer
+// list of key/value pairs, returning the number of substitutions that occurred.
+//
+// Example:
+//
+// std::string s = std::string("$who bought $count #Noun. Thanks $who!");
+// int count;
+// count = absl::StrReplaceAll({{"$count", absl::StrCat(5)},
+// {"$who", "Bob"},
+// {"#Noun", "Apples"}}, &s);
+// EXPECT_EQ(count, 4);
+// EXPECT_EQ("Bob bought 5 Apples. Thanks Bob!", s);
+int StrReplaceAll(
+ std::initializer_list<std::pair<absl::string_view, absl::string_view>>
+ replacements,
+ std::string* target);
+
+// Overload of `StrReplaceAll()` to replace patterns within a given output
+// string *in place* with replacements provided within a container of key/value
+// pairs.
+//
+// Example:
+//
+// std::string s = std::string("if (ptr < &foo)");
+// int count = absl::StrReplaceAll({{"&", "&"},
+// {"<", "<"},
+// {">", ">"}}, &s);
+// EXPECT_EQ(count, 2);
+// EXPECT_EQ("if (ptr < &foo)", s);
+template <typename StrToStrMapping>
+int StrReplaceAll(const StrToStrMapping& replacements, std::string* target);
+
+// Implementation details only, past this point.
+namespace strings_internal {
+
+struct ViableSubstitution {
+ absl::string_view old;
+ absl::string_view replacement;
+ size_t offset;
+
+ ViableSubstitution(absl::string_view old_str,
+ absl::string_view replacement_str, size_t offset_val)
+ : old(old_str), replacement(replacement_str), offset(offset_val) {}
+
+ // One substitution occurs "before" another (takes priority) if either
+ // it has the lowest offset, or it has the same offset but a larger size.
+ bool OccursBefore(const ViableSubstitution& y) const {
+ if (offset != y.offset) return offset < y.offset;
+ return old.size() > y.old.size();
+ }
+};
+
+// Build a vector of ViableSubstitutions based on the given list of
+// replacements. subs can be implemented as a priority_queue. However, it turns
+// out that most callers have small enough a list of substitutions that the
+// overhead of such a queue isn't worth it.
+template <typename StrToStrMapping>
+std::vector<ViableSubstitution> FindSubstitutions(
+ absl::string_view s, const StrToStrMapping& replacements) {
+ std::vector<ViableSubstitution> subs;
+ subs.reserve(replacements.size());
+
+ for (const auto& rep : replacements) {
+ using std::get;
+ absl::string_view old(get<0>(rep));
+
+ size_t pos = s.find(old);
+ if (pos == s.npos) continue;
+
+ // Ignore attempts to replace "". This condition is almost never true,
+ // but above condition is frequently true. That's why we test for this
+ // now and not before.
+ if (old.empty()) continue;
+
+ subs.emplace_back(old, get<1>(rep), pos);
+
+ // Insertion sort to ensure the last ViableSubstitution comes before
+ // all the others.
+ size_t index = subs.size();
+ while (--index && subs[index - 1].OccursBefore(subs[index])) {
+ std::swap(subs[index], subs[index - 1]);
+ }
+ }
+ return subs;
+}
+
+int ApplySubstitutions(absl::string_view s,
+ std::vector<ViableSubstitution>* subs_ptr,
+ std::string* result_ptr);
+
+} // namespace strings_internal
+
+template <typename StrToStrMapping>
+std::string StrReplaceAll(absl::string_view s,
+ const StrToStrMapping& replacements) {
+ auto subs = strings_internal::FindSubstitutions(s, replacements);
+ std::string result;
+ result.reserve(s.size());
+ strings_internal::ApplySubstitutions(s, &subs, &result);
+ return result;
+}
+
+template <typename StrToStrMapping>
+int StrReplaceAll(const StrToStrMapping& replacements, std::string* target) {
+ auto subs = strings_internal::FindSubstitutions(*target, replacements);
+ if (subs.empty()) return 0;
+
+ std::string result;
+ result.reserve(target->size());
+ int substitutions =
+ strings_internal::ApplySubstitutions(*target, &subs, &result);
+ target->swap(result);
+ return substitutions;
+}
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_STRINGS_STR_REPLACE_H_
diff --git a/third_party/abseil/src/absl/strings/str_replace_benchmark.cc b/third_party/abseil/src/absl/strings/str_replace_benchmark.cc
new file mode 100644
index 0000000..01331da
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/str_replace_benchmark.cc
@@ -0,0 +1,122 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/strings/str_replace.h"
+
+#include <cstring>
+#include <string>
+
+#include "benchmark/benchmark.h"
+#include "absl/base/internal/raw_logging.h"
+
+namespace {
+
+std::string* big_string;
+std::string* after_replacing_the;
+std::string* after_replacing_many;
+
+struct Replacement {
+ const char* needle;
+ const char* replacement;
+} replacements[] = {
+ {"the", "box"}, //
+ {"brown", "quick"}, //
+ {"jumped", "liquored"}, //
+ {"dozen", "brown"}, //
+ {"lazy", "pack"}, //
+ {"liquor", "shakes"}, //
+};
+
+// Here, we set up a string for use in global-replace benchmarks.
+// We started with a million blanks, and then deterministically insert
+// 10,000 copies each of two pangrams. The result is a string that is
+// 40% blank space and 60% these words. 'the' occurs 18,247 times and
+// all the substitutions together occur 49,004 times.
+//
+// We then create "after_replacing_the" to be a string that is a result of
+// replacing "the" with "box" in big_string.
+//
+// And then we create "after_replacing_many" to be a string that is result
+// of preferring several substitutions.
+void SetUpStrings() {
+ if (big_string == nullptr) {
+ size_t r = 0;
+ big_string = new std::string(1000 * 1000, ' ');
+ for (std::string phrase : {"the quick brown fox jumped over the lazy dogs",
+ "pack my box with the five dozen liquor jugs"}) {
+ for (int i = 0; i < 10 * 1000; ++i) {
+ r = r * 237 + 41; // not very random.
+ memcpy(&(*big_string)[r % (big_string->size() - phrase.size())],
+ phrase.data(), phrase.size());
+ }
+ }
+ // big_string->resize(50);
+ // OK, we've set up the string, now let's set up expectations - first by
+ // just replacing "the" with "box"
+ after_replacing_the = new std::string(*big_string);
+ for (size_t pos = 0;
+ (pos = after_replacing_the->find("the", pos)) != std::string::npos;) {
+ memcpy(&(*after_replacing_the)[pos], "box", 3);
+ }
+ // And then with all the replacements.
+ after_replacing_many = new std::string(*big_string);
+ for (size_t pos = 0;;) {
+ size_t next_pos = static_cast<size_t>(-1);
+ const char* needle_string = nullptr;
+ const char* replacement_string = nullptr;
+ for (const auto& r : replacements) {
+ auto needlepos = after_replacing_many->find(r.needle, pos);
+ if (needlepos != std::string::npos && needlepos < next_pos) {
+ next_pos = needlepos;
+ needle_string = r.needle;
+ replacement_string = r.replacement;
+ }
+ }
+ if (next_pos > after_replacing_many->size()) break;
+ after_replacing_many->replace(next_pos, strlen(needle_string),
+ replacement_string);
+ next_pos += strlen(replacement_string);
+ pos = next_pos;
+ }
+ }
+}
+
+void BM_StrReplaceAllOneReplacement(benchmark::State& state) {
+ SetUpStrings();
+ std::string src = *big_string;
+ for (auto _ : state) {
+ std::string dest = absl::StrReplaceAll(src, {{"the", "box"}});
+ ABSL_RAW_CHECK(dest == *after_replacing_the,
+ "not benchmarking intended behavior");
+ }
+}
+BENCHMARK(BM_StrReplaceAllOneReplacement);
+
+void BM_StrReplaceAll(benchmark::State& state) {
+ SetUpStrings();
+ std::string src = *big_string;
+ for (auto _ : state) {
+ std::string dest = absl::StrReplaceAll(src, {{"the", "box"},
+ {"brown", "quick"},
+ {"jumped", "liquored"},
+ {"dozen", "brown"},
+ {"lazy", "pack"},
+ {"liquor", "shakes"}});
+ ABSL_RAW_CHECK(dest == *after_replacing_many,
+ "not benchmarking intended behavior");
+ }
+}
+BENCHMARK(BM_StrReplaceAll);
+
+} // namespace
diff --git a/third_party/abseil/src/absl/strings/str_replace_test.cc b/third_party/abseil/src/absl/strings/str_replace_test.cc
new file mode 100644
index 0000000..9d8c7f7
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/str_replace_test.cc
@@ -0,0 +1,341 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/strings/str_replace.h"
+
+#include <list>
+#include <map>
+#include <tuple>
+
+#include "gtest/gtest.h"
+#include "absl/strings/str_cat.h"
+#include "absl/strings/str_split.h"
+
+TEST(StrReplaceAll, OneReplacement) {
+ std::string s;
+
+ // Empty string.
+ s = absl::StrReplaceAll(s, {{"", ""}});
+ EXPECT_EQ(s, "");
+ s = absl::StrReplaceAll(s, {{"x", ""}});
+ EXPECT_EQ(s, "");
+ s = absl::StrReplaceAll(s, {{"", "y"}});
+ EXPECT_EQ(s, "");
+ s = absl::StrReplaceAll(s, {{"x", "y"}});
+ EXPECT_EQ(s, "");
+
+ // Empty substring.
+ s = absl::StrReplaceAll("abc", {{"", ""}});
+ EXPECT_EQ(s, "abc");
+ s = absl::StrReplaceAll("abc", {{"", "y"}});
+ EXPECT_EQ(s, "abc");
+ s = absl::StrReplaceAll("abc", {{"x", ""}});
+ EXPECT_EQ(s, "abc");
+
+ // Substring not found.
+ s = absl::StrReplaceAll("abc", {{"xyz", "123"}});
+ EXPECT_EQ(s, "abc");
+
+ // Replace entire string.
+ s = absl::StrReplaceAll("abc", {{"abc", "xyz"}});
+ EXPECT_EQ(s, "xyz");
+
+ // Replace once at the start.
+ s = absl::StrReplaceAll("abc", {{"a", "x"}});
+ EXPECT_EQ(s, "xbc");
+
+ // Replace once in the middle.
+ s = absl::StrReplaceAll("abc", {{"b", "x"}});
+ EXPECT_EQ(s, "axc");
+
+ // Replace once at the end.
+ s = absl::StrReplaceAll("abc", {{"c", "x"}});
+ EXPECT_EQ(s, "abx");
+
+ // Replace multiple times with varying lengths of original/replacement.
+ s = absl::StrReplaceAll("ababa", {{"a", "xxx"}});
+ EXPECT_EQ(s, "xxxbxxxbxxx");
+
+ s = absl::StrReplaceAll("ababa", {{"b", "xxx"}});
+ EXPECT_EQ(s, "axxxaxxxa");
+
+ s = absl::StrReplaceAll("aaabaaabaaa", {{"aaa", "x"}});
+ EXPECT_EQ(s, "xbxbx");
+
+ s = absl::StrReplaceAll("abbbabbba", {{"bbb", "x"}});
+ EXPECT_EQ(s, "axaxa");
+
+ // Overlapping matches are replaced greedily.
+ s = absl::StrReplaceAll("aaa", {{"aa", "x"}});
+ EXPECT_EQ(s, "xa");
+
+ // The replacements are not recursive.
+ s = absl::StrReplaceAll("aaa", {{"aa", "a"}});
+ EXPECT_EQ(s, "aa");
+}
+
+TEST(StrReplaceAll, ManyReplacements) {
+ std::string s;
+
+ // Empty string.
+ s = absl::StrReplaceAll("", {{"", ""}, {"x", ""}, {"", "y"}, {"x", "y"}});
+ EXPECT_EQ(s, "");
+
+ // Empty substring.
+ s = absl::StrReplaceAll("abc", {{"", ""}, {"", "y"}, {"x", ""}});
+ EXPECT_EQ(s, "abc");
+
+ // Replace entire string, one char at a time
+ s = absl::StrReplaceAll("abc", {{"a", "x"}, {"b", "y"}, {"c", "z"}});
+ EXPECT_EQ(s, "xyz");
+ s = absl::StrReplaceAll("zxy", {{"z", "x"}, {"x", "y"}, {"y", "z"}});
+ EXPECT_EQ(s, "xyz");
+
+ // Replace once at the start (longer matches take precedence)
+ s = absl::StrReplaceAll("abc", {{"a", "x"}, {"ab", "xy"}, {"abc", "xyz"}});
+ EXPECT_EQ(s, "xyz");
+
+ // Replace once in the middle.
+ s = absl::StrReplaceAll(
+ "Abc!", {{"a", "x"}, {"ab", "xy"}, {"b", "y"}, {"bc", "yz"}, {"c", "z"}});
+ EXPECT_EQ(s, "Ayz!");
+
+ // Replace once at the end.
+ s = absl::StrReplaceAll(
+ "Abc!",
+ {{"a", "x"}, {"ab", "xy"}, {"b", "y"}, {"bc!", "yz?"}, {"c!", "z;"}});
+ EXPECT_EQ(s, "Ayz?");
+
+ // Replace multiple times with varying lengths of original/replacement.
+ s = absl::StrReplaceAll("ababa", {{"a", "xxx"}, {"b", "XXXX"}});
+ EXPECT_EQ(s, "xxxXXXXxxxXXXXxxx");
+
+ // Overlapping matches are replaced greedily.
+ s = absl::StrReplaceAll("aaa", {{"aa", "x"}, {"a", "X"}});
+ EXPECT_EQ(s, "xX");
+ s = absl::StrReplaceAll("aaa", {{"a", "X"}, {"aa", "x"}});
+ EXPECT_EQ(s, "xX");
+
+ // Two well-known sentences
+ s = absl::StrReplaceAll("the quick brown fox jumped over the lazy dogs",
+ {
+ {"brown", "box"},
+ {"dogs", "jugs"},
+ {"fox", "with"},
+ {"jumped", "five"},
+ {"over", "dozen"},
+ {"quick", "my"},
+ {"the", "pack"},
+ {"the lazy", "liquor"},
+ });
+ EXPECT_EQ(s, "pack my box with five dozen liquor jugs");
+}
+
+TEST(StrReplaceAll, ManyReplacementsInMap) {
+ std::map<const char *, const char *> replacements;
+ replacements["$who"] = "Bob";
+ replacements["$count"] = "5";
+ replacements["#Noun"] = "Apples";
+ std::string s = absl::StrReplaceAll("$who bought $count #Noun. Thanks $who!",
+ replacements);
+ EXPECT_EQ("Bob bought 5 Apples. Thanks Bob!", s);
+}
+
+TEST(StrReplaceAll, ReplacementsInPlace) {
+ std::string s = std::string("$who bought $count #Noun. Thanks $who!");
+ int count;
+ count = absl::StrReplaceAll({{"$count", absl::StrCat(5)},
+ {"$who", "Bob"},
+ {"#Noun", "Apples"}}, &s);
+ EXPECT_EQ(count, 4);
+ EXPECT_EQ("Bob bought 5 Apples. Thanks Bob!", s);
+}
+
+TEST(StrReplaceAll, ReplacementsInPlaceInMap) {
+ std::string s = std::string("$who bought $count #Noun. Thanks $who!");
+ std::map<absl::string_view, absl::string_view> replacements;
+ replacements["$who"] = "Bob";
+ replacements["$count"] = "5";
+ replacements["#Noun"] = "Apples";
+ int count;
+ count = absl::StrReplaceAll(replacements, &s);
+ EXPECT_EQ(count, 4);
+ EXPECT_EQ("Bob bought 5 Apples. Thanks Bob!", s);
+}
+
+struct Cont {
+ Cont() {}
+ explicit Cont(absl::string_view src) : data(src) {}
+
+ absl::string_view data;
+};
+
+template <int index>
+absl::string_view get(const Cont& c) {
+ auto splitter = absl::StrSplit(c.data, ':');
+ auto it = splitter.begin();
+ for (int i = 0; i < index; ++i) ++it;
+
+ return *it;
+}
+
+TEST(StrReplaceAll, VariableNumber) {
+ std::string s;
+ {
+ std::vector<std::pair<std::string, std::string>> replacements;
+
+ s = "abc";
+ EXPECT_EQ(0, absl::StrReplaceAll(replacements, &s));
+ EXPECT_EQ("abc", s);
+
+ s = "abc";
+ replacements.push_back({"a", "A"});
+ EXPECT_EQ(1, absl::StrReplaceAll(replacements, &s));
+ EXPECT_EQ("Abc", s);
+
+ s = "abc";
+ replacements.push_back({"b", "B"});
+ EXPECT_EQ(2, absl::StrReplaceAll(replacements, &s));
+ EXPECT_EQ("ABc", s);
+
+ s = "abc";
+ replacements.push_back({"d", "D"});
+ EXPECT_EQ(2, absl::StrReplaceAll(replacements, &s));
+ EXPECT_EQ("ABc", s);
+
+ EXPECT_EQ("ABcABc", absl::StrReplaceAll("abcabc", replacements));
+ }
+
+ {
+ std::map<const char*, const char*> replacements;
+ replacements["aa"] = "x";
+ replacements["a"] = "X";
+ s = "aaa";
+ EXPECT_EQ(2, absl::StrReplaceAll(replacements, &s));
+ EXPECT_EQ("xX", s);
+
+ EXPECT_EQ("xxX", absl::StrReplaceAll("aaaaa", replacements));
+ }
+
+ {
+ std::list<std::pair<absl::string_view, absl::string_view>> replacements = {
+ {"a", "x"}, {"b", "y"}, {"c", "z"}};
+
+ std::string s = absl::StrReplaceAll("abc", replacements);
+ EXPECT_EQ(s, "xyz");
+ }
+
+ {
+ using X = std::tuple<absl::string_view, std::string, int>;
+ std::vector<X> replacements(3);
+ replacements[0] = X{"a", "x", 1};
+ replacements[1] = X{"b", "y", 0};
+ replacements[2] = X{"c", "z", -1};
+
+ std::string s = absl::StrReplaceAll("abc", replacements);
+ EXPECT_EQ(s, "xyz");
+ }
+
+ {
+ std::vector<Cont> replacements(3);
+ replacements[0] = Cont{"a:x"};
+ replacements[1] = Cont{"b:y"};
+ replacements[2] = Cont{"c:z"};
+
+ std::string s = absl::StrReplaceAll("abc", replacements);
+ EXPECT_EQ(s, "xyz");
+ }
+}
+
+// Same as above, but using the in-place variant of absl::StrReplaceAll,
+// that returns the # of replacements performed.
+TEST(StrReplaceAll, Inplace) {
+ std::string s;
+ int reps;
+
+ // Empty string.
+ s = "";
+ reps = absl::StrReplaceAll({{"", ""}, {"x", ""}, {"", "y"}, {"x", "y"}}, &s);
+ EXPECT_EQ(reps, 0);
+ EXPECT_EQ(s, "");
+
+ // Empty substring.
+ s = "abc";
+ reps = absl::StrReplaceAll({{"", ""}, {"", "y"}, {"x", ""}}, &s);
+ EXPECT_EQ(reps, 0);
+ EXPECT_EQ(s, "abc");
+
+ // Replace entire string, one char at a time
+ s = "abc";
+ reps = absl::StrReplaceAll({{"a", "x"}, {"b", "y"}, {"c", "z"}}, &s);
+ EXPECT_EQ(reps, 3);
+ EXPECT_EQ(s, "xyz");
+ s = "zxy";
+ reps = absl::StrReplaceAll({{"z", "x"}, {"x", "y"}, {"y", "z"}}, &s);
+ EXPECT_EQ(reps, 3);
+ EXPECT_EQ(s, "xyz");
+
+ // Replace once at the start (longer matches take precedence)
+ s = "abc";
+ reps = absl::StrReplaceAll({{"a", "x"}, {"ab", "xy"}, {"abc", "xyz"}}, &s);
+ EXPECT_EQ(reps, 1);
+ EXPECT_EQ(s, "xyz");
+
+ // Replace once in the middle.
+ s = "Abc!";
+ reps = absl::StrReplaceAll(
+ {{"a", "x"}, {"ab", "xy"}, {"b", "y"}, {"bc", "yz"}, {"c", "z"}}, &s);
+ EXPECT_EQ(reps, 1);
+ EXPECT_EQ(s, "Ayz!");
+
+ // Replace once at the end.
+ s = "Abc!";
+ reps = absl::StrReplaceAll(
+ {{"a", "x"}, {"ab", "xy"}, {"b", "y"}, {"bc!", "yz?"}, {"c!", "z;"}}, &s);
+ EXPECT_EQ(reps, 1);
+ EXPECT_EQ(s, "Ayz?");
+
+ // Replace multiple times with varying lengths of original/replacement.
+ s = "ababa";
+ reps = absl::StrReplaceAll({{"a", "xxx"}, {"b", "XXXX"}}, &s);
+ EXPECT_EQ(reps, 5);
+ EXPECT_EQ(s, "xxxXXXXxxxXXXXxxx");
+
+ // Overlapping matches are replaced greedily.
+ s = "aaa";
+ reps = absl::StrReplaceAll({{"aa", "x"}, {"a", "X"}}, &s);
+ EXPECT_EQ(reps, 2);
+ EXPECT_EQ(s, "xX");
+ s = "aaa";
+ reps = absl::StrReplaceAll({{"a", "X"}, {"aa", "x"}}, &s);
+ EXPECT_EQ(reps, 2);
+ EXPECT_EQ(s, "xX");
+
+ // Two well-known sentences
+ s = "the quick brown fox jumped over the lazy dogs";
+ reps = absl::StrReplaceAll(
+ {
+ {"brown", "box"},
+ {"dogs", "jugs"},
+ {"fox", "with"},
+ {"jumped", "five"},
+ {"over", "dozen"},
+ {"quick", "my"},
+ {"the", "pack"},
+ {"the lazy", "liquor"},
+ },
+ &s);
+ EXPECT_EQ(reps, 8);
+ EXPECT_EQ(s, "pack my box with five dozen liquor jugs");
+}
diff --git a/third_party/abseil/src/absl/strings/str_split.cc b/third_party/abseil/src/absl/strings/str_split.cc
new file mode 100644
index 0000000..e08c26b
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/str_split.cc
@@ -0,0 +1,139 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/strings/str_split.h"
+
+#include <algorithm>
+#include <cassert>
+#include <cstdint>
+#include <cstdlib>
+#include <cstring>
+#include <iterator>
+#include <limits>
+#include <memory>
+
+#include "absl/base/internal/raw_logging.h"
+#include "absl/strings/ascii.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+namespace {
+
+// This GenericFind() template function encapsulates the finding algorithm
+// shared between the ByString and ByAnyChar delimiters. The FindPolicy
+// template parameter allows each delimiter to customize the actual find
+// function to use and the length of the found delimiter. For example, the
+// Literal delimiter will ultimately use absl::string_view::find(), and the
+// AnyOf delimiter will use absl::string_view::find_first_of().
+template <typename FindPolicy>
+absl::string_view GenericFind(absl::string_view text,
+ absl::string_view delimiter, size_t pos,
+ FindPolicy find_policy) {
+ if (delimiter.empty() && text.length() > 0) {
+ // Special case for empty string delimiters: always return a zero-length
+ // absl::string_view referring to the item at position 1 past pos.
+ return absl::string_view(text.data() + pos + 1, 0);
+ }
+ size_t found_pos = absl::string_view::npos;
+ absl::string_view found(text.data() + text.size(),
+ 0); // By default, not found
+ found_pos = find_policy.Find(text, delimiter, pos);
+ if (found_pos != absl::string_view::npos) {
+ found = absl::string_view(text.data() + found_pos,
+ find_policy.Length(delimiter));
+ }
+ return found;
+}
+
+// Finds using absl::string_view::find(), therefore the length of the found
+// delimiter is delimiter.length().
+struct LiteralPolicy {
+ size_t Find(absl::string_view text, absl::string_view delimiter, size_t pos) {
+ return text.find(delimiter, pos);
+ }
+ size_t Length(absl::string_view delimiter) { return delimiter.length(); }
+};
+
+// Finds using absl::string_view::find_first_of(), therefore the length of the
+// found delimiter is 1.
+struct AnyOfPolicy {
+ size_t Find(absl::string_view text, absl::string_view delimiter, size_t pos) {
+ return text.find_first_of(delimiter, pos);
+ }
+ size_t Length(absl::string_view /* delimiter */) { return 1; }
+};
+
+} // namespace
+
+//
+// ByString
+//
+
+ByString::ByString(absl::string_view sp) : delimiter_(sp) {}
+
+absl::string_view ByString::Find(absl::string_view text, size_t pos) const {
+ if (delimiter_.length() == 1) {
+ // Much faster to call find on a single character than on an
+ // absl::string_view.
+ size_t found_pos = text.find(delimiter_[0], pos);
+ if (found_pos == absl::string_view::npos)
+ return absl::string_view(text.data() + text.size(), 0);
+ return text.substr(found_pos, 1);
+ }
+ return GenericFind(text, delimiter_, pos, LiteralPolicy());
+}
+
+//
+// ByChar
+//
+
+absl::string_view ByChar::Find(absl::string_view text, size_t pos) const {
+ size_t found_pos = text.find(c_, pos);
+ if (found_pos == absl::string_view::npos)
+ return absl::string_view(text.data() + text.size(), 0);
+ return text.substr(found_pos, 1);
+}
+
+//
+// ByAnyChar
+//
+
+ByAnyChar::ByAnyChar(absl::string_view sp) : delimiters_(sp) {}
+
+absl::string_view ByAnyChar::Find(absl::string_view text, size_t pos) const {
+ return GenericFind(text, delimiters_, pos, AnyOfPolicy());
+}
+
+//
+// ByLength
+//
+ByLength::ByLength(ptrdiff_t length) : length_(length) {
+ ABSL_RAW_CHECK(length > 0, "");
+}
+
+absl::string_view ByLength::Find(absl::string_view text,
+ size_t pos) const {
+ pos = std::min(pos, text.size()); // truncate `pos`
+ absl::string_view substr = text.substr(pos);
+ // If the string is shorter than the chunk size we say we
+ // "can't find the delimiter" so this will be the last chunk.
+ if (substr.length() <= static_cast<size_t>(length_))
+ return absl::string_view(text.data() + text.size(), 0);
+
+ return absl::string_view(substr.data() + length_, 0);
+}
+
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/strings/str_split.h b/third_party/abseil/src/absl/strings/str_split.h
new file mode 100644
index 0000000..bfbca42
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/str_split.h
@@ -0,0 +1,548 @@
+//
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: str_split.h
+// -----------------------------------------------------------------------------
+//
+// This file contains functions for splitting strings. It defines the main
+// `StrSplit()` function, several delimiters for determining the boundaries on
+// which to split the string, and predicates for filtering delimited results.
+// `StrSplit()` adapts the returned collection to the type specified by the
+// caller.
+//
+// Example:
+//
+// // Splits the given string on commas. Returns the results in a
+// // vector of strings.
+// std::vector<std::string> v = absl::StrSplit("a,b,c", ',');
+// // Can also use ","
+// // v[0] == "a", v[1] == "b", v[2] == "c"
+//
+// See StrSplit() below for more information.
+#ifndef ABSL_STRINGS_STR_SPLIT_H_
+#define ABSL_STRINGS_STR_SPLIT_H_
+
+#include <algorithm>
+#include <cstddef>
+#include <map>
+#include <set>
+#include <string>
+#include <utility>
+#include <vector>
+
+#include "absl/base/internal/raw_logging.h"
+#include "absl/base/macros.h"
+#include "absl/strings/internal/str_split_internal.h"
+#include "absl/strings/string_view.h"
+#include "absl/strings/strip.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+//------------------------------------------------------------------------------
+// Delimiters
+//------------------------------------------------------------------------------
+//
+// `StrSplit()` uses delimiters to define the boundaries between elements in the
+// provided input. Several `Delimiter` types are defined below. If a string
+// (`const char*`, `std::string`, or `absl::string_view`) is passed in place of
+// an explicit `Delimiter` object, `StrSplit()` treats it the same way as if it
+// were passed a `ByString` delimiter.
+//
+// A `Delimiter` is an object with a `Find()` function that knows how to find
+// the first occurrence of itself in a given `absl::string_view`.
+//
+// The following `Delimiter` types are available for use within `StrSplit()`:
+//
+// - `ByString` (default for string arguments)
+// - `ByChar` (default for a char argument)
+// - `ByAnyChar`
+// - `ByLength`
+// - `MaxSplits`
+//
+// A Delimiter's `Find()` member function will be passed an input `text` that is
+// to be split and a position (`pos`) to begin searching for the next delimiter
+// in `text`. The returned absl::string_view should refer to the next occurrence
+// (after `pos`) of the represented delimiter; this returned absl::string_view
+// represents the next location where the input `text` should be broken.
+//
+// The returned absl::string_view may be zero-length if the Delimiter does not
+// represent a part of the string (e.g., a fixed-length delimiter). If no
+// delimiter is found in the input `text`, a zero-length absl::string_view
+// referring to `text.end()` should be returned (e.g.,
+// `text.substr(text.size())`). It is important that the returned
+// absl::string_view always be within the bounds of the input `text` given as an
+// argument--it must not refer to a string that is physically located outside of
+// the given string.
+//
+// The following example is a simple Delimiter object that is created with a
+// single char and will look for that char in the text passed to the `Find()`
+// function:
+//
+// struct SimpleDelimiter {
+// const char c_;
+// explicit SimpleDelimiter(char c) : c_(c) {}
+// absl::string_view Find(absl::string_view text, size_t pos) {
+// auto found = text.find(c_, pos);
+// if (found == absl::string_view::npos)
+// return text.substr(text.size());
+//
+// return text.substr(found, 1);
+// }
+// };
+
+// ByString
+//
+// A sub-string delimiter. If `StrSplit()` is passed a string in place of a
+// `Delimiter` object, the string will be implicitly converted into a
+// `ByString` delimiter.
+//
+// Example:
+//
+// // Because a string literal is converted to an `absl::ByString`,
+// // the following two splits are equivalent.
+//
+// std::vector<std::string> v1 = absl::StrSplit("a, b, c", ", ");
+//
+// using absl::ByString;
+// std::vector<std::string> v2 = absl::StrSplit("a, b, c",
+// ByString(", "));
+// // v[0] == "a", v[1] == "b", v[2] == "c"
+class ByString {
+ public:
+ explicit ByString(absl::string_view sp);
+ absl::string_view Find(absl::string_view text, size_t pos) const;
+
+ private:
+ const std::string delimiter_;
+};
+
+// ByChar
+//
+// A single character delimiter. `ByChar` is functionally equivalent to a
+// 1-char string within a `ByString` delimiter, but slightly more efficient.
+//
+// Example:
+//
+// // Because a char literal is converted to a absl::ByChar,
+// // the following two splits are equivalent.
+// std::vector<std::string> v1 = absl::StrSplit("a,b,c", ',');
+// using absl::ByChar;
+// std::vector<std::string> v2 = absl::StrSplit("a,b,c", ByChar(','));
+// // v[0] == "a", v[1] == "b", v[2] == "c"
+//
+// `ByChar` is also the default delimiter if a single character is given
+// as the delimiter to `StrSplit()`. For example, the following calls are
+// equivalent:
+//
+// std::vector<std::string> v = absl::StrSplit("a-b", '-');
+//
+// using absl::ByChar;
+// std::vector<std::string> v = absl::StrSplit("a-b", ByChar('-'));
+//
+class ByChar {
+ public:
+ explicit ByChar(char c) : c_(c) {}
+ absl::string_view Find(absl::string_view text, size_t pos) const;
+
+ private:
+ char c_;
+};
+
+// ByAnyChar
+//
+// A delimiter that will match any of the given byte-sized characters within
+// its provided string.
+//
+// Note: this delimiter works with single-byte string data, but does not work
+// with variable-width encodings, such as UTF-8.
+//
+// Example:
+//
+// using absl::ByAnyChar;
+// std::vector<std::string> v = absl::StrSplit("a,b=c", ByAnyChar(",="));
+// // v[0] == "a", v[1] == "b", v[2] == "c"
+//
+// If `ByAnyChar` is given the empty string, it behaves exactly like
+// `ByString` and matches each individual character in the input string.
+//
+class ByAnyChar {
+ public:
+ explicit ByAnyChar(absl::string_view sp);
+ absl::string_view Find(absl::string_view text, size_t pos) const;
+
+ private:
+ const std::string delimiters_;
+};
+
+// ByLength
+//
+// A delimiter for splitting into equal-length strings. The length argument to
+// the constructor must be greater than 0.
+//
+// Note: this delimiter works with single-byte string data, but does not work
+// with variable-width encodings, such as UTF-8.
+//
+// Example:
+//
+// using absl::ByLength;
+// std::vector<std::string> v = absl::StrSplit("123456789", ByLength(3));
+
+// // v[0] == "123", v[1] == "456", v[2] == "789"
+//
+// Note that the string does not have to be a multiple of the fixed split
+// length. In such a case, the last substring will be shorter.
+//
+// using absl::ByLength;
+// std::vector<std::string> v = absl::StrSplit("12345", ByLength(2));
+//
+// // v[0] == "12", v[1] == "34", v[2] == "5"
+class ByLength {
+ public:
+ explicit ByLength(ptrdiff_t length);
+ absl::string_view Find(absl::string_view text, size_t pos) const;
+
+ private:
+ const ptrdiff_t length_;
+};
+
+namespace strings_internal {
+
+// A traits-like metafunction for selecting the default Delimiter object type
+// for a particular Delimiter type. The base case simply exposes type Delimiter
+// itself as the delimiter's Type. However, there are specializations for
+// string-like objects that map them to the ByString delimiter object.
+// This allows functions like absl::StrSplit() and absl::MaxSplits() to accept
+// string-like objects (e.g., ',') as delimiter arguments but they will be
+// treated as if a ByString delimiter was given.
+template <typename Delimiter>
+struct SelectDelimiter {
+ using type = Delimiter;
+};
+
+template <>
+struct SelectDelimiter<char> {
+ using type = ByChar;
+};
+template <>
+struct SelectDelimiter<char*> {
+ using type = ByString;
+};
+template <>
+struct SelectDelimiter<const char*> {
+ using type = ByString;
+};
+template <>
+struct SelectDelimiter<absl::string_view> {
+ using type = ByString;
+};
+template <>
+struct SelectDelimiter<std::string> {
+ using type = ByString;
+};
+
+// Wraps another delimiter and sets a max number of matches for that delimiter.
+template <typename Delimiter>
+class MaxSplitsImpl {
+ public:
+ MaxSplitsImpl(Delimiter delimiter, int limit)
+ : delimiter_(delimiter), limit_(limit), count_(0) {}
+ absl::string_view Find(absl::string_view text, size_t pos) {
+ if (count_++ == limit_) {
+ return absl::string_view(text.data() + text.size(),
+ 0); // No more matches.
+ }
+ return delimiter_.Find(text, pos);
+ }
+
+ private:
+ Delimiter delimiter_;
+ const int limit_;
+ int count_;
+};
+
+} // namespace strings_internal
+
+// MaxSplits()
+//
+// A delimiter that limits the number of matches which can occur to the passed
+// `limit`. The last element in the returned collection will contain all
+// remaining unsplit pieces, which may contain instances of the delimiter.
+// The collection will contain at most `limit` + 1 elements.
+// Example:
+//
+// using absl::MaxSplits;
+// std::vector<std::string> v = absl::StrSplit("a,b,c", MaxSplits(',', 1));
+//
+// // v[0] == "a", v[1] == "b,c"
+template <typename Delimiter>
+inline strings_internal::MaxSplitsImpl<
+ typename strings_internal::SelectDelimiter<Delimiter>::type>
+MaxSplits(Delimiter delimiter, int limit) {
+ typedef
+ typename strings_internal::SelectDelimiter<Delimiter>::type DelimiterType;
+ return strings_internal::MaxSplitsImpl<DelimiterType>(
+ DelimiterType(delimiter), limit);
+}
+
+//------------------------------------------------------------------------------
+// Predicates
+//------------------------------------------------------------------------------
+//
+// Predicates filter the results of a `StrSplit()` by determining whether or not
+// a resultant element is included in the result set. A predicate may be passed
+// as an optional third argument to the `StrSplit()` function.
+//
+// Predicates are unary functions (or functors) that take a single
+// `absl::string_view` argument and return a bool indicating whether the
+// argument should be included (`true`) or excluded (`false`).
+//
+// Predicates are useful when filtering out empty substrings. By default, empty
+// substrings may be returned by `StrSplit()`, which is similar to the way split
+// functions work in other programming languages.
+
+// AllowEmpty()
+//
+// Always returns `true`, indicating that all strings--including empty
+// strings--should be included in the split output. This predicate is not
+// strictly needed because this is the default behavior of `StrSplit()`;
+// however, it might be useful at some call sites to make the intent explicit.
+//
+// Example:
+//
+// std::vector<std::string> v = absl::StrSplit(" a , ,,b,", ',', AllowEmpty());
+//
+// // v[0] == " a ", v[1] == " ", v[2] == "", v[3] = "b", v[4] == ""
+struct AllowEmpty {
+ bool operator()(absl::string_view) const { return true; }
+};
+
+// SkipEmpty()
+//
+// Returns `false` if the given `absl::string_view` is empty, indicating that
+// `StrSplit()` should omit the empty string.
+//
+// Example:
+//
+// std::vector<std::string> v = absl::StrSplit(",a,,b,", ',', SkipEmpty());
+//
+// // v[0] == "a", v[1] == "b"
+//
+// Note: `SkipEmpty()` does not consider a string containing only whitespace
+// to be empty. To skip such whitespace as well, use the `SkipWhitespace()`
+// predicate.
+struct SkipEmpty {
+ bool operator()(absl::string_view sp) const { return !sp.empty(); }
+};
+
+// SkipWhitespace()
+//
+// Returns `false` if the given `absl::string_view` is empty *or* contains only
+// whitespace, indicating that `StrSplit()` should omit the string.
+//
+// Example:
+//
+// std::vector<std::string> v = absl::StrSplit(" a , ,,b,",
+// ',', SkipWhitespace());
+// // v[0] == " a ", v[1] == "b"
+//
+// // SkipEmpty() would return whitespace elements
+// std::vector<std::string> v = absl::StrSplit(" a , ,,b,", ',', SkipEmpty());
+// // v[0] == " a ", v[1] == " ", v[2] == "b"
+struct SkipWhitespace {
+ bool operator()(absl::string_view sp) const {
+ sp = absl::StripAsciiWhitespace(sp);
+ return !sp.empty();
+ }
+};
+
+template <typename T>
+using EnableSplitIfString =
+ typename std::enable_if<std::is_same<T, std::string>::value ||
+ std::is_same<T, const std::string>::value,
+ int>::type;
+
+//------------------------------------------------------------------------------
+// StrSplit()
+//------------------------------------------------------------------------------
+
+// StrSplit()
+//
+// Splits a given string based on the provided `Delimiter` object, returning the
+// elements within the type specified by the caller. Optionally, you may pass a
+// `Predicate` to `StrSplit()` indicating whether to include or exclude the
+// resulting element within the final result set. (See the overviews for
+// Delimiters and Predicates above.)
+//
+// Example:
+//
+// std::vector<std::string> v = absl::StrSplit("a,b,c,d", ',');
+// // v[0] == "a", v[1] == "b", v[2] == "c", v[3] == "d"
+//
+// You can also provide an explicit `Delimiter` object:
+//
+// Example:
+//
+// using absl::ByAnyChar;
+// std::vector<std::string> v = absl::StrSplit("a,b=c", ByAnyChar(",="));
+// // v[0] == "a", v[1] == "b", v[2] == "c"
+//
+// See above for more information on delimiters.
+//
+// By default, empty strings are included in the result set. You can optionally
+// include a third `Predicate` argument to apply a test for whether the
+// resultant element should be included in the result set:
+//
+// Example:
+//
+// std::vector<std::string> v = absl::StrSplit(" a , ,,b,",
+// ',', SkipWhitespace());
+// // v[0] == " a ", v[1] == "b"
+//
+// See above for more information on predicates.
+//
+//------------------------------------------------------------------------------
+// StrSplit() Return Types
+//------------------------------------------------------------------------------
+//
+// The `StrSplit()` function adapts the returned collection to the collection
+// specified by the caller (e.g. `std::vector` above). The returned collections
+// may contain `std::string`, `absl::string_view` (in which case the original
+// string being split must ensure that it outlives the collection), or any
+// object that can be explicitly created from an `absl::string_view`. This
+// behavior works for:
+//
+// 1) All standard STL containers including `std::vector`, `std::list`,
+// `std::deque`, `std::set`,`std::multiset`, 'std::map`, and `std::multimap`
+// 2) `std::pair` (which is not actually a container). See below.
+//
+// Example:
+//
+// // The results are returned as `absl::string_view` objects. Note that we
+// // have to ensure that the input string outlives any results.
+// std::vector<absl::string_view> v = absl::StrSplit("a,b,c", ',');
+//
+// // Stores results in a std::set<std::string>, which also performs
+// // de-duplication and orders the elements in ascending order.
+// std::set<std::string> a = absl::StrSplit("b,a,c,a,b", ',');
+// // v[0] == "a", v[1] == "b", v[2] = "c"
+//
+// // `StrSplit()` can be used within a range-based for loop, in which case
+// // each element will be of type `absl::string_view`.
+// std::vector<std::string> v;
+// for (const auto sv : absl::StrSplit("a,b,c", ',')) {
+// if (sv != "b") v.emplace_back(sv);
+// }
+// // v[0] == "a", v[1] == "c"
+//
+// // Stores results in a map. The map implementation assumes that the input
+// // is provided as a series of key/value pairs. For example, the 0th element
+// // resulting from the split will be stored as a key to the 1st element. If
+// // an odd number of elements are resolved, the last element is paired with
+// // a default-constructed value (e.g., empty string).
+// std::map<std::string, std::string> m = absl::StrSplit("a,b,c", ',');
+// // m["a"] == "b", m["c"] == "" // last component value equals ""
+//
+// Splitting to `std::pair` is an interesting case because it can hold only two
+// elements and is not a collection type. When splitting to a `std::pair` the
+// first two split strings become the `std::pair` `.first` and `.second`
+// members, respectively. The remaining split substrings are discarded. If there
+// are less than two split substrings, the empty string is used for the
+// corresponding
+// `std::pair` member.
+//
+// Example:
+//
+// // Stores first two split strings as the members in a std::pair.
+// std::pair<std::string, std::string> p = absl::StrSplit("a,b,c", ',');
+// // p.first == "a", p.second == "b" // "c" is omitted.
+//
+// The `StrSplit()` function can be used multiple times to perform more
+// complicated splitting logic, such as intelligently parsing key-value pairs.
+//
+// Example:
+//
+// // The input string "a=b=c,d=e,f=,g" becomes
+// // { "a" => "b=c", "d" => "e", "f" => "", "g" => "" }
+// std::map<std::string, std::string> m;
+// for (absl::string_view sp : absl::StrSplit("a=b=c,d=e,f=,g", ',')) {
+// m.insert(absl::StrSplit(sp, absl::MaxSplits('=', 1)));
+// }
+// EXPECT_EQ("b=c", m.find("a")->second);
+// EXPECT_EQ("e", m.find("d")->second);
+// EXPECT_EQ("", m.find("f")->second);
+// EXPECT_EQ("", m.find("g")->second);
+//
+// WARNING: Due to a legacy bug that is maintained for backward compatibility,
+// splitting the following empty string_views produces different results:
+//
+// absl::StrSplit(absl::string_view(""), '-'); // {""}
+// absl::StrSplit(absl::string_view(), '-'); // {}, but should be {""}
+//
+// Try not to depend on this distinction because the bug may one day be fixed.
+template <typename Delimiter>
+strings_internal::Splitter<
+ typename strings_internal::SelectDelimiter<Delimiter>::type, AllowEmpty,
+ absl::string_view>
+StrSplit(strings_internal::ConvertibleToStringView text, Delimiter d) {
+ using DelimiterType =
+ typename strings_internal::SelectDelimiter<Delimiter>::type;
+ return strings_internal::Splitter<DelimiterType, AllowEmpty,
+ absl::string_view>(
+ text.value(), DelimiterType(d), AllowEmpty());
+}
+
+template <typename Delimiter, typename StringType,
+ EnableSplitIfString<StringType> = 0>
+strings_internal::Splitter<
+ typename strings_internal::SelectDelimiter<Delimiter>::type, AllowEmpty,
+ std::string>
+StrSplit(StringType&& text, Delimiter d) {
+ using DelimiterType =
+ typename strings_internal::SelectDelimiter<Delimiter>::type;
+ return strings_internal::Splitter<DelimiterType, AllowEmpty, std::string>(
+ std::move(text), DelimiterType(d), AllowEmpty());
+}
+
+template <typename Delimiter, typename Predicate>
+strings_internal::Splitter<
+ typename strings_internal::SelectDelimiter<Delimiter>::type, Predicate,
+ absl::string_view>
+StrSplit(strings_internal::ConvertibleToStringView text, Delimiter d,
+ Predicate p) {
+ using DelimiterType =
+ typename strings_internal::SelectDelimiter<Delimiter>::type;
+ return strings_internal::Splitter<DelimiterType, Predicate,
+ absl::string_view>(
+ text.value(), DelimiterType(d), std::move(p));
+}
+
+template <typename Delimiter, typename Predicate, typename StringType,
+ EnableSplitIfString<StringType> = 0>
+strings_internal::Splitter<
+ typename strings_internal::SelectDelimiter<Delimiter>::type, Predicate,
+ std::string>
+StrSplit(StringType&& text, Delimiter d, Predicate p) {
+ using DelimiterType =
+ typename strings_internal::SelectDelimiter<Delimiter>::type;
+ return strings_internal::Splitter<DelimiterType, Predicate, std::string>(
+ std::move(text), DelimiterType(d), std::move(p));
+}
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_STRINGS_STR_SPLIT_H_
diff --git a/third_party/abseil/src/absl/strings/str_split_benchmark.cc b/third_party/abseil/src/absl/strings/str_split_benchmark.cc
new file mode 100644
index 0000000..f38dfcf
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/str_split_benchmark.cc
@@ -0,0 +1,180 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/strings/str_split.h"
+
+#include <iterator>
+#include <string>
+#include <unordered_map>
+#include <unordered_set>
+#include <vector>
+
+#include "benchmark/benchmark.h"
+#include "absl/base/internal/raw_logging.h"
+#include "absl/strings/string_view.h"
+
+namespace {
+
+std::string MakeTestString(int desired_length) {
+ static const int kAverageValueLen = 25;
+ std::string test(desired_length * kAverageValueLen, 'x');
+ for (int i = 1; i < test.size(); i += kAverageValueLen) {
+ test[i] = ';';
+ }
+ return test;
+}
+
+void BM_Split2StringView(benchmark::State& state) {
+ std::string test = MakeTestString(state.range(0));
+ for (auto _ : state) {
+ std::vector<absl::string_view> result = absl::StrSplit(test, ';');
+ benchmark::DoNotOptimize(result);
+ }
+}
+BENCHMARK_RANGE(BM_Split2StringView, 0, 1 << 20);
+
+static const absl::string_view kDelimiters = ";:,.";
+
+std::string MakeMultiDelimiterTestString(int desired_length) {
+ static const int kAverageValueLen = 25;
+ std::string test(desired_length * kAverageValueLen, 'x');
+ for (int i = 0; i * kAverageValueLen < test.size(); ++i) {
+ // Cycle through a variety of delimiters.
+ test[i * kAverageValueLen] = kDelimiters[i % kDelimiters.size()];
+ }
+ return test;
+}
+
+// Measure StrSplit with ByAnyChar with four delimiters to choose from.
+void BM_Split2StringViewByAnyChar(benchmark::State& state) {
+ std::string test = MakeMultiDelimiterTestString(state.range(0));
+ for (auto _ : state) {
+ std::vector<absl::string_view> result =
+ absl::StrSplit(test, absl::ByAnyChar(kDelimiters));
+ benchmark::DoNotOptimize(result);
+ }
+}
+BENCHMARK_RANGE(BM_Split2StringViewByAnyChar, 0, 1 << 20);
+
+void BM_Split2StringViewLifted(benchmark::State& state) {
+ std::string test = MakeTestString(state.range(0));
+ std::vector<absl::string_view> result;
+ for (auto _ : state) {
+ result = absl::StrSplit(test, ';');
+ }
+ benchmark::DoNotOptimize(result);
+}
+BENCHMARK_RANGE(BM_Split2StringViewLifted, 0, 1 << 20);
+
+void BM_Split2String(benchmark::State& state) {
+ std::string test = MakeTestString(state.range(0));
+ for (auto _ : state) {
+ std::vector<std::string> result = absl::StrSplit(test, ';');
+ benchmark::DoNotOptimize(result);
+ }
+}
+BENCHMARK_RANGE(BM_Split2String, 0, 1 << 20);
+
+// This benchmark is for comparing Split2 to Split1 (SplitStringUsing). In
+// particular, this benchmark uses SkipEmpty() to match SplitStringUsing's
+// behavior.
+void BM_Split2SplitStringUsing(benchmark::State& state) {
+ std::string test = MakeTestString(state.range(0));
+ for (auto _ : state) {
+ std::vector<std::string> result =
+ absl::StrSplit(test, ';', absl::SkipEmpty());
+ benchmark::DoNotOptimize(result);
+ }
+}
+BENCHMARK_RANGE(BM_Split2SplitStringUsing, 0, 1 << 20);
+
+void BM_SplitStringToUnorderedSet(benchmark::State& state) {
+ const int len = state.range(0);
+ std::string test(len, 'x');
+ for (int i = 1; i < len; i += 2) {
+ test[i] = ';';
+ }
+ for (auto _ : state) {
+ std::unordered_set<std::string> result =
+ absl::StrSplit(test, ':', absl::SkipEmpty());
+ benchmark::DoNotOptimize(result);
+ }
+}
+BENCHMARK_RANGE(BM_SplitStringToUnorderedSet, 0, 1 << 20);
+
+void BM_SplitStringToUnorderedMap(benchmark::State& state) {
+ const int len = state.range(0);
+ std::string test(len, 'x');
+ for (int i = 1; i < len; i += 2) {
+ test[i] = ';';
+ }
+ for (auto _ : state) {
+ std::unordered_map<std::string, std::string> result =
+ absl::StrSplit(test, ':', absl::SkipEmpty());
+ benchmark::DoNotOptimize(result);
+ }
+}
+BENCHMARK_RANGE(BM_SplitStringToUnorderedMap, 0, 1 << 20);
+
+void BM_SplitStringAllowEmpty(benchmark::State& state) {
+ const int len = state.range(0);
+ std::string test(len, 'x');
+ for (int i = 1; i < len; i += 2) {
+ test[i] = ';';
+ }
+ for (auto _ : state) {
+ std::vector<std::string> result = absl::StrSplit(test, ';');
+ benchmark::DoNotOptimize(result);
+ }
+}
+BENCHMARK_RANGE(BM_SplitStringAllowEmpty, 0, 1 << 20);
+
+struct OneCharLiteral {
+ char operator()() const { return 'X'; }
+};
+
+struct OneCharStringLiteral {
+ const char* operator()() const { return "X"; }
+};
+
+template <typename DelimiterFactory>
+void BM_SplitStringWithOneChar(benchmark::State& state) {
+ const auto delimiter = DelimiterFactory()();
+ std::vector<absl::string_view> pieces;
+ size_t v = 0;
+ for (auto _ : state) {
+ pieces = absl::StrSplit("The quick brown fox jumps over the lazy dog",
+ delimiter);
+ v += pieces.size();
+ }
+ ABSL_RAW_CHECK(v == state.iterations(), "");
+}
+BENCHMARK_TEMPLATE(BM_SplitStringWithOneChar, OneCharLiteral);
+BENCHMARK_TEMPLATE(BM_SplitStringWithOneChar, OneCharStringLiteral);
+
+template <typename DelimiterFactory>
+void BM_SplitStringWithOneCharNoVector(benchmark::State& state) {
+ const auto delimiter = DelimiterFactory()();
+ size_t v = 0;
+ for (auto _ : state) {
+ auto splitter = absl::StrSplit(
+ "The quick brown fox jumps over the lazy dog", delimiter);
+ v += std::distance(splitter.begin(), splitter.end());
+ }
+ ABSL_RAW_CHECK(v == state.iterations(), "");
+}
+BENCHMARK_TEMPLATE(BM_SplitStringWithOneCharNoVector, OneCharLiteral);
+BENCHMARK_TEMPLATE(BM_SplitStringWithOneCharNoVector, OneCharStringLiteral);
+
+} // namespace
diff --git a/third_party/abseil/src/absl/strings/str_split_test.cc b/third_party/abseil/src/absl/strings/str_split_test.cc
new file mode 100644
index 0000000..7f7c097
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/str_split_test.cc
@@ -0,0 +1,953 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/strings/str_split.h"
+
+#include <deque>
+#include <initializer_list>
+#include <list>
+#include <map>
+#include <memory>
+#include <string>
+#include <type_traits>
+#include <unordered_map>
+#include <unordered_set>
+#include <vector>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/base/dynamic_annotations.h"
+#include "absl/base/macros.h"
+#include "absl/container/flat_hash_map.h"
+#include "absl/container/node_hash_map.h"
+#include "absl/strings/numbers.h"
+
+namespace {
+
+using ::testing::ElementsAre;
+using ::testing::Pair;
+using ::testing::UnorderedElementsAre;
+
+TEST(Split, TraitsTest) {
+ static_assert(!absl::strings_internal::SplitterIsConvertibleTo<int>::value,
+ "");
+ static_assert(
+ !absl::strings_internal::SplitterIsConvertibleTo<std::string>::value, "");
+ static_assert(absl::strings_internal::SplitterIsConvertibleTo<
+ std::vector<std::string>>::value,
+ "");
+ static_assert(
+ !absl::strings_internal::SplitterIsConvertibleTo<std::vector<int>>::value,
+ "");
+ static_assert(absl::strings_internal::SplitterIsConvertibleTo<
+ std::vector<absl::string_view>>::value,
+ "");
+ static_assert(absl::strings_internal::SplitterIsConvertibleTo<
+ std::map<std::string, std::string>>::value,
+ "");
+ static_assert(absl::strings_internal::SplitterIsConvertibleTo<
+ std::map<absl::string_view, absl::string_view>>::value,
+ "");
+ static_assert(!absl::strings_internal::SplitterIsConvertibleTo<
+ std::map<int, std::string>>::value,
+ "");
+ static_assert(!absl::strings_internal::SplitterIsConvertibleTo<
+ std::map<std::string, int>>::value,
+ "");
+}
+
+// This tests the overall split API, which is made up of the absl::StrSplit()
+// function and the Delimiter objects in the absl:: namespace.
+// This TEST macro is outside of any namespace to require full specification of
+// namespaces just like callers will need to use.
+TEST(Split, APIExamples) {
+ {
+ // Passes string delimiter. Assumes the default of ByString.
+ std::vector<std::string> v = absl::StrSplit("a,b,c", ","); // NOLINT
+ EXPECT_THAT(v, ElementsAre("a", "b", "c"));
+
+ // Equivalent to...
+ using absl::ByString;
+ v = absl::StrSplit("a,b,c", ByString(","));
+ EXPECT_THAT(v, ElementsAre("a", "b", "c"));
+
+ // Equivalent to...
+ EXPECT_THAT(absl::StrSplit("a,b,c", ByString(",")),
+ ElementsAre("a", "b", "c"));
+ }
+
+ {
+ // Same as above, but using a single character as the delimiter.
+ std::vector<std::string> v = absl::StrSplit("a,b,c", ',');
+ EXPECT_THAT(v, ElementsAre("a", "b", "c"));
+
+ // Equivalent to...
+ using absl::ByChar;
+ v = absl::StrSplit("a,b,c", ByChar(','));
+ EXPECT_THAT(v, ElementsAre("a", "b", "c"));
+ }
+
+ {
+ // Uses the Literal string "=>" as the delimiter.
+ const std::vector<std::string> v = absl::StrSplit("a=>b=>c", "=>");
+ EXPECT_THAT(v, ElementsAre("a", "b", "c"));
+ }
+
+ {
+ // The substrings are returned as string_views, eliminating copying.
+ std::vector<absl::string_view> v = absl::StrSplit("a,b,c", ',');
+ EXPECT_THAT(v, ElementsAre("a", "b", "c"));
+ }
+
+ {
+ // Leading and trailing empty substrings.
+ std::vector<std::string> v = absl::StrSplit(",a,b,c,", ',');
+ EXPECT_THAT(v, ElementsAre("", "a", "b", "c", ""));
+ }
+
+ {
+ // Splits on a delimiter that is not found.
+ std::vector<std::string> v = absl::StrSplit("abc", ',');
+ EXPECT_THAT(v, ElementsAre("abc"));
+ }
+
+ {
+ // Splits the input string into individual characters by using an empty
+ // string as the delimiter.
+ std::vector<std::string> v = absl::StrSplit("abc", "");
+ EXPECT_THAT(v, ElementsAre("a", "b", "c"));
+ }
+
+ {
+ // Splits string data with embedded NUL characters, using NUL as the
+ // delimiter. A simple delimiter of "\0" doesn't work because strlen() will
+ // say that's the empty string when constructing the absl::string_view
+ // delimiter. Instead, a non-empty string containing NUL can be used as the
+ // delimiter.
+ std::string embedded_nulls("a\0b\0c", 5);
+ std::string null_delim("\0", 1);
+ std::vector<std::string> v = absl::StrSplit(embedded_nulls, null_delim);
+ EXPECT_THAT(v, ElementsAre("a", "b", "c"));
+ }
+
+ {
+ // Stores first two split strings as the members in a std::pair.
+ std::pair<std::string, std::string> p = absl::StrSplit("a,b,c", ',');
+ EXPECT_EQ("a", p.first);
+ EXPECT_EQ("b", p.second);
+ // "c" is omitted because std::pair can hold only two elements.
+ }
+
+ {
+ // Results stored in std::set<std::string>
+ std::set<std::string> v = absl::StrSplit("a,b,c,a,b,c,a,b,c", ',');
+ EXPECT_THAT(v, ElementsAre("a", "b", "c"));
+ }
+
+ {
+ // Uses a non-const char* delimiter.
+ char a[] = ",";
+ char* d = a + 0;
+ std::vector<std::string> v = absl::StrSplit("a,b,c", d);
+ EXPECT_THAT(v, ElementsAre("a", "b", "c"));
+ }
+
+ {
+ // Results split using either of , or ;
+ using absl::ByAnyChar;
+ std::vector<std::string> v = absl::StrSplit("a,b;c", ByAnyChar(",;"));
+ EXPECT_THAT(v, ElementsAre("a", "b", "c"));
+ }
+
+ {
+ // Uses the SkipWhitespace predicate.
+ using absl::SkipWhitespace;
+ std::vector<std::string> v =
+ absl::StrSplit(" a , ,,b,", ',', SkipWhitespace());
+ EXPECT_THAT(v, ElementsAre(" a ", "b"));
+ }
+
+ {
+ // Uses the ByLength delimiter.
+ using absl::ByLength;
+ std::vector<std::string> v = absl::StrSplit("abcdefg", ByLength(3));
+ EXPECT_THAT(v, ElementsAre("abc", "def", "g"));
+ }
+
+ {
+ // Different forms of initialization / conversion.
+ std::vector<std::string> v1 = absl::StrSplit("a,b,c", ',');
+ EXPECT_THAT(v1, ElementsAre("a", "b", "c"));
+ std::vector<std::string> v2(absl::StrSplit("a,b,c", ','));
+ EXPECT_THAT(v2, ElementsAre("a", "b", "c"));
+ auto v3 = std::vector<std::string>(absl::StrSplit("a,b,c", ','));
+ EXPECT_THAT(v3, ElementsAre("a", "b", "c"));
+ v3 = absl::StrSplit("a,b,c", ',');
+ EXPECT_THAT(v3, ElementsAre("a", "b", "c"));
+ }
+
+ {
+ // Results stored in a std::map.
+ std::map<std::string, std::string> m = absl::StrSplit("a,1,b,2,a,3", ',');
+ EXPECT_EQ(2, m.size());
+ EXPECT_EQ("3", m["a"]);
+ EXPECT_EQ("2", m["b"]);
+ }
+
+ {
+ // Results stored in a std::multimap.
+ std::multimap<std::string, std::string> m =
+ absl::StrSplit("a,1,b,2,a,3", ',');
+ EXPECT_EQ(3, m.size());
+ auto it = m.find("a");
+ EXPECT_EQ("1", it->second);
+ ++it;
+ EXPECT_EQ("3", it->second);
+ it = m.find("b");
+ EXPECT_EQ("2", it->second);
+ }
+
+ {
+ // Demonstrates use in a range-based for loop in C++11.
+ std::string s = "x,x,x,x,x,x,x";
+ for (absl::string_view sp : absl::StrSplit(s, ',')) {
+ EXPECT_EQ("x", sp);
+ }
+ }
+
+ {
+ // Demonstrates use with a Predicate in a range-based for loop.
+ using absl::SkipWhitespace;
+ std::string s = " ,x,,x,,x,x,x,,";
+ for (absl::string_view sp : absl::StrSplit(s, ',', SkipWhitespace())) {
+ EXPECT_EQ("x", sp);
+ }
+ }
+
+ {
+ // Demonstrates a "smart" split to std::map using two separate calls to
+ // absl::StrSplit. One call to split the records, and another call to split
+ // the keys and values. This also uses the Limit delimiter so that the
+ // std::string "a=b=c" will split to "a" -> "b=c".
+ std::map<std::string, std::string> m;
+ for (absl::string_view sp : absl::StrSplit("a=b=c,d=e,f=,g", ',')) {
+ m.insert(absl::StrSplit(sp, absl::MaxSplits('=', 1)));
+ }
+ EXPECT_EQ("b=c", m.find("a")->second);
+ EXPECT_EQ("e", m.find("d")->second);
+ EXPECT_EQ("", m.find("f")->second);
+ EXPECT_EQ("", m.find("g")->second);
+ }
+}
+
+//
+// Tests for SplitIterator
+//
+
+TEST(SplitIterator, Basics) {
+ auto splitter = absl::StrSplit("a,b", ',');
+ auto it = splitter.begin();
+ auto end = splitter.end();
+
+ EXPECT_NE(it, end);
+ EXPECT_EQ("a", *it); // tests dereference
+ ++it; // tests preincrement
+ EXPECT_NE(it, end);
+ EXPECT_EQ("b",
+ std::string(it->data(), it->size())); // tests dereference as ptr
+ it++; // tests postincrement
+ EXPECT_EQ(it, end);
+}
+
+// Simple Predicate to skip a particular string.
+class Skip {
+ public:
+ explicit Skip(const std::string& s) : s_(s) {}
+ bool operator()(absl::string_view sp) { return sp != s_; }
+
+ private:
+ std::string s_;
+};
+
+TEST(SplitIterator, Predicate) {
+ auto splitter = absl::StrSplit("a,b,c", ',', Skip("b"));
+ auto it = splitter.begin();
+ auto end = splitter.end();
+
+ EXPECT_NE(it, end);
+ EXPECT_EQ("a", *it); // tests dereference
+ ++it; // tests preincrement -- "b" should be skipped here.
+ EXPECT_NE(it, end);
+ EXPECT_EQ("c",
+ std::string(it->data(), it->size())); // tests dereference as ptr
+ it++; // tests postincrement
+ EXPECT_EQ(it, end);
+}
+
+TEST(SplitIterator, EdgeCases) {
+ // Expected input and output, assuming a delimiter of ','
+ struct {
+ std::string in;
+ std::vector<std::string> expect;
+ } specs[] = {
+ {"", {""}},
+ {"foo", {"foo"}},
+ {",", {"", ""}},
+ {",foo", {"", "foo"}},
+ {"foo,", {"foo", ""}},
+ {",foo,", {"", "foo", ""}},
+ {"foo,bar", {"foo", "bar"}},
+ };
+
+ for (const auto& spec : specs) {
+ SCOPED_TRACE(spec.in);
+ auto splitter = absl::StrSplit(spec.in, ',');
+ auto it = splitter.begin();
+ auto end = splitter.end();
+ for (const auto& expected : spec.expect) {
+ EXPECT_NE(it, end);
+ EXPECT_EQ(expected, *it++);
+ }
+ EXPECT_EQ(it, end);
+ }
+}
+
+TEST(Splitter, Const) {
+ const auto splitter = absl::StrSplit("a,b,c", ',');
+ EXPECT_THAT(splitter, ElementsAre("a", "b", "c"));
+}
+
+TEST(Split, EmptyAndNull) {
+ // Attention: Splitting a null absl::string_view is different than splitting
+ // an empty absl::string_view even though both string_views are considered
+ // equal. This behavior is likely surprising and undesirable. However, to
+ // maintain backward compatibility, there is a small "hack" in
+ // str_split_internal.h that preserves this behavior. If that behavior is ever
+ // changed/fixed, this test will need to be updated.
+ EXPECT_THAT(absl::StrSplit(absl::string_view(""), '-'), ElementsAre(""));
+ EXPECT_THAT(absl::StrSplit(absl::string_view(), '-'), ElementsAre());
+}
+
+TEST(SplitIterator, EqualityAsEndCondition) {
+ auto splitter = absl::StrSplit("a,b,c", ',');
+ auto it = splitter.begin();
+ auto it2 = it;
+
+ // Increments it2 twice to point to "c" in the input text.
+ ++it2;
+ ++it2;
+ EXPECT_EQ("c", *it2);
+
+ // This test uses a non-end SplitIterator as the terminating condition in a
+ // for loop. This relies on SplitIterator equality for non-end SplitIterators
+ // working correctly. At this point it2 points to "c", and we use that as the
+ // "end" condition in this test.
+ std::vector<absl::string_view> v;
+ for (; it != it2; ++it) {
+ v.push_back(*it);
+ }
+ EXPECT_THAT(v, ElementsAre("a", "b"));
+}
+
+//
+// Tests for Splitter
+//
+
+TEST(Splitter, RangeIterators) {
+ auto splitter = absl::StrSplit("a,b,c", ',');
+ std::vector<absl::string_view> output;
+ for (const absl::string_view& p : splitter) {
+ output.push_back(p);
+ }
+ EXPECT_THAT(output, ElementsAre("a", "b", "c"));
+}
+
+// Some template functions for use in testing conversion operators
+template <typename ContainerType, typename Splitter>
+void TestConversionOperator(const Splitter& splitter) {
+ ContainerType output = splitter;
+ EXPECT_THAT(output, UnorderedElementsAre("a", "b", "c", "d"));
+}
+
+template <typename MapType, typename Splitter>
+void TestMapConversionOperator(const Splitter& splitter) {
+ MapType m = splitter;
+ EXPECT_THAT(m, UnorderedElementsAre(Pair("a", "b"), Pair("c", "d")));
+}
+
+template <typename FirstType, typename SecondType, typename Splitter>
+void TestPairConversionOperator(const Splitter& splitter) {
+ std::pair<FirstType, SecondType> p = splitter;
+ EXPECT_EQ(p, (std::pair<FirstType, SecondType>("a", "b")));
+}
+
+TEST(Splitter, ConversionOperator) {
+ auto splitter = absl::StrSplit("a,b,c,d", ',');
+
+ TestConversionOperator<std::vector<absl::string_view>>(splitter);
+ TestConversionOperator<std::vector<std::string>>(splitter);
+ TestConversionOperator<std::list<absl::string_view>>(splitter);
+ TestConversionOperator<std::list<std::string>>(splitter);
+ TestConversionOperator<std::deque<absl::string_view>>(splitter);
+ TestConversionOperator<std::deque<std::string>>(splitter);
+ TestConversionOperator<std::set<absl::string_view>>(splitter);
+ TestConversionOperator<std::set<std::string>>(splitter);
+ TestConversionOperator<std::multiset<absl::string_view>>(splitter);
+ TestConversionOperator<std::multiset<std::string>>(splitter);
+ TestConversionOperator<std::unordered_set<std::string>>(splitter);
+
+ // Tests conversion to map-like objects.
+
+ TestMapConversionOperator<std::map<absl::string_view, absl::string_view>>(
+ splitter);
+ TestMapConversionOperator<std::map<absl::string_view, std::string>>(splitter);
+ TestMapConversionOperator<std::map<std::string, absl::string_view>>(splitter);
+ TestMapConversionOperator<std::map<std::string, std::string>>(splitter);
+ TestMapConversionOperator<
+ std::multimap<absl::string_view, absl::string_view>>(splitter);
+ TestMapConversionOperator<std::multimap<absl::string_view, std::string>>(
+ splitter);
+ TestMapConversionOperator<std::multimap<std::string, absl::string_view>>(
+ splitter);
+ TestMapConversionOperator<std::multimap<std::string, std::string>>(splitter);
+ TestMapConversionOperator<std::unordered_map<std::string, std::string>>(
+ splitter);
+ TestMapConversionOperator<
+ absl::node_hash_map<absl::string_view, absl::string_view>>(splitter);
+ TestMapConversionOperator<
+ absl::node_hash_map<absl::string_view, std::string>>(splitter);
+ TestMapConversionOperator<
+ absl::node_hash_map<std::string, absl::string_view>>(splitter);
+ TestMapConversionOperator<
+ absl::flat_hash_map<absl::string_view, absl::string_view>>(splitter);
+ TestMapConversionOperator<
+ absl::flat_hash_map<absl::string_view, std::string>>(splitter);
+ TestMapConversionOperator<
+ absl::flat_hash_map<std::string, absl::string_view>>(splitter);
+
+ // Tests conversion to std::pair
+
+ TestPairConversionOperator<absl::string_view, absl::string_view>(splitter);
+ TestPairConversionOperator<absl::string_view, std::string>(splitter);
+ TestPairConversionOperator<std::string, absl::string_view>(splitter);
+ TestPairConversionOperator<std::string, std::string>(splitter);
+}
+
+// A few additional tests for conversion to std::pair. This conversion is
+// different from others because a std::pair always has exactly two elements:
+// .first and .second. The split has to work even when the split has
+// less-than, equal-to, and more-than 2 strings.
+TEST(Splitter, ToPair) {
+ {
+ // Empty string
+ std::pair<std::string, std::string> p = absl::StrSplit("", ',');
+ EXPECT_EQ("", p.first);
+ EXPECT_EQ("", p.second);
+ }
+
+ {
+ // Only first
+ std::pair<std::string, std::string> p = absl::StrSplit("a", ',');
+ EXPECT_EQ("a", p.first);
+ EXPECT_EQ("", p.second);
+ }
+
+ {
+ // Only second
+ std::pair<std::string, std::string> p = absl::StrSplit(",b", ',');
+ EXPECT_EQ("", p.first);
+ EXPECT_EQ("b", p.second);
+ }
+
+ {
+ // First and second.
+ std::pair<std::string, std::string> p = absl::StrSplit("a,b", ',');
+ EXPECT_EQ("a", p.first);
+ EXPECT_EQ("b", p.second);
+ }
+
+ {
+ // First and second and then more stuff that will be ignored.
+ std::pair<std::string, std::string> p = absl::StrSplit("a,b,c", ',');
+ EXPECT_EQ("a", p.first);
+ EXPECT_EQ("b", p.second);
+ // "c" is omitted.
+ }
+}
+
+TEST(Splitter, Predicates) {
+ static const char kTestChars[] = ",a, ,b,";
+ using absl::AllowEmpty;
+ using absl::SkipEmpty;
+ using absl::SkipWhitespace;
+
+ {
+ // No predicate. Does not skip empties.
+ auto splitter = absl::StrSplit(kTestChars, ',');
+ std::vector<std::string> v = splitter;
+ EXPECT_THAT(v, ElementsAre("", "a", " ", "b", ""));
+ }
+
+ {
+ // Allows empty strings. Same behavior as no predicate at all.
+ auto splitter = absl::StrSplit(kTestChars, ',', AllowEmpty());
+ std::vector<std::string> v_allowempty = splitter;
+ EXPECT_THAT(v_allowempty, ElementsAre("", "a", " ", "b", ""));
+
+ // Ensures AllowEmpty equals the behavior with no predicate.
+ auto splitter_nopredicate = absl::StrSplit(kTestChars, ',');
+ std::vector<std::string> v_nopredicate = splitter_nopredicate;
+ EXPECT_EQ(v_allowempty, v_nopredicate);
+ }
+
+ {
+ // Skips empty strings.
+ auto splitter = absl::StrSplit(kTestChars, ',', SkipEmpty());
+ std::vector<std::string> v = splitter;
+ EXPECT_THAT(v, ElementsAre("a", " ", "b"));
+ }
+
+ {
+ // Skips empty and all-whitespace strings.
+ auto splitter = absl::StrSplit(kTestChars, ',', SkipWhitespace());
+ std::vector<std::string> v = splitter;
+ EXPECT_THAT(v, ElementsAre("a", "b"));
+ }
+}
+
+//
+// Tests for StrSplit()
+//
+
+TEST(Split, Basics) {
+ {
+ // Doesn't really do anything useful because the return value is ignored,
+ // but it should work.
+ absl::StrSplit("a,b,c", ',');
+ }
+
+ {
+ std::vector<absl::string_view> v = absl::StrSplit("a,b,c", ',');
+ EXPECT_THAT(v, ElementsAre("a", "b", "c"));
+ }
+
+ {
+ std::vector<std::string> v = absl::StrSplit("a,b,c", ',');
+ EXPECT_THAT(v, ElementsAre("a", "b", "c"));
+ }
+
+ {
+ // Ensures that assignment works. This requires a little extra work with
+ // C++11 because of overloads with initializer_list.
+ std::vector<std::string> v;
+ v = absl::StrSplit("a,b,c", ',');
+
+ EXPECT_THAT(v, ElementsAre("a", "b", "c"));
+ std::map<std::string, std::string> m;
+ m = absl::StrSplit("a,b,c", ',');
+ EXPECT_EQ(2, m.size());
+ std::unordered_map<std::string, std::string> hm;
+ hm = absl::StrSplit("a,b,c", ',');
+ EXPECT_EQ(2, hm.size());
+ }
+}
+
+absl::string_view ReturnStringView() { return "Hello World"; }
+const char* ReturnConstCharP() { return "Hello World"; }
+char* ReturnCharP() { return const_cast<char*>("Hello World"); }
+
+TEST(Split, AcceptsCertainTemporaries) {
+ std::vector<std::string> v;
+ v = absl::StrSplit(ReturnStringView(), ' ');
+ EXPECT_THAT(v, ElementsAre("Hello", "World"));
+ v = absl::StrSplit(ReturnConstCharP(), ' ');
+ EXPECT_THAT(v, ElementsAre("Hello", "World"));
+ v = absl::StrSplit(ReturnCharP(), ' ');
+ EXPECT_THAT(v, ElementsAre("Hello", "World"));
+}
+
+TEST(Split, Temporary) {
+ // Use a std::string longer than the SSO length, so that when the temporary is
+ // destroyed, if the splitter keeps a reference to the string's contents,
+ // it'll reference freed memory instead of just dead on-stack memory.
+ const char input[] = "a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u";
+ EXPECT_LT(sizeof(std::string), ABSL_ARRAYSIZE(input))
+ << "Input should be larger than fits on the stack.";
+
+ // This happens more often in C++11 as part of a range-based for loop.
+ auto splitter = absl::StrSplit(std::string(input), ',');
+ std::string expected = "a";
+ for (absl::string_view letter : splitter) {
+ EXPECT_EQ(expected, letter);
+ ++expected[0];
+ }
+ EXPECT_EQ("v", expected);
+
+ // This happens more often in C++11 as part of a range-based for loop.
+ auto std_splitter = absl::StrSplit(std::string(input), ',');
+ expected = "a";
+ for (absl::string_view letter : std_splitter) {
+ EXPECT_EQ(expected, letter);
+ ++expected[0];
+ }
+ EXPECT_EQ("v", expected);
+}
+
+template <typename T>
+static std::unique_ptr<T> CopyToHeap(const T& value) {
+ return std::unique_ptr<T>(new T(value));
+}
+
+TEST(Split, LvalueCaptureIsCopyable) {
+ std::string input = "a,b";
+ auto heap_splitter = CopyToHeap(absl::StrSplit(input, ','));
+ auto stack_splitter = *heap_splitter;
+ heap_splitter.reset();
+ std::vector<std::string> result = stack_splitter;
+ EXPECT_THAT(result, testing::ElementsAre("a", "b"));
+}
+
+TEST(Split, TemporaryCaptureIsCopyable) {
+ auto heap_splitter = CopyToHeap(absl::StrSplit(std::string("a,b"), ','));
+ auto stack_splitter = *heap_splitter;
+ heap_splitter.reset();
+ std::vector<std::string> result = stack_splitter;
+ EXPECT_THAT(result, testing::ElementsAre("a", "b"));
+}
+
+TEST(Split, SplitterIsCopyableAndMoveable) {
+ auto a = absl::StrSplit("foo", '-');
+
+ // Ensures that the following expressions compile.
+ auto b = a; // Copy construct
+ auto c = std::move(a); // Move construct
+ b = c; // Copy assign
+ c = std::move(b); // Move assign
+
+ EXPECT_THAT(c, ElementsAre("foo"));
+}
+
+TEST(Split, StringDelimiter) {
+ {
+ std::vector<absl::string_view> v = absl::StrSplit("a,b", ',');
+ EXPECT_THAT(v, ElementsAre("a", "b"));
+ }
+
+ {
+ std::vector<absl::string_view> v = absl::StrSplit("a,b", std::string(","));
+ EXPECT_THAT(v, ElementsAre("a", "b"));
+ }
+
+ {
+ std::vector<absl::string_view> v =
+ absl::StrSplit("a,b", absl::string_view(","));
+ EXPECT_THAT(v, ElementsAre("a", "b"));
+ }
+}
+
+#if !defined(__cpp_char8_t)
+#if defined(__clang__)
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wc++2a-compat"
+#endif
+TEST(Split, UTF8) {
+ // Tests splitting utf8 strings and utf8 delimiters.
+ std::string utf8_string = u8"\u03BA\u1F79\u03C3\u03BC\u03B5";
+ {
+ // A utf8 input string with an ascii delimiter.
+ std::string to_split = "a," + utf8_string;
+ std::vector<absl::string_view> v = absl::StrSplit(to_split, ',');
+ EXPECT_THAT(v, ElementsAre("a", utf8_string));
+ }
+
+ {
+ // A utf8 input string and a utf8 delimiter.
+ std::string to_split = "a," + utf8_string + ",b";
+ std::string unicode_delimiter = "," + utf8_string + ",";
+ std::vector<absl::string_view> v =
+ absl::StrSplit(to_split, unicode_delimiter);
+ EXPECT_THAT(v, ElementsAre("a", "b"));
+ }
+
+ {
+ // A utf8 input string and ByAnyChar with ascii chars.
+ std::vector<absl::string_view> v =
+ absl::StrSplit(u8"Foo h\u00E4llo th\u4E1Ere", absl::ByAnyChar(" \t"));
+ EXPECT_THAT(v, ElementsAre("Foo", u8"h\u00E4llo", u8"th\u4E1Ere"));
+ }
+}
+#if defined(__clang__)
+#pragma clang diagnostic pop
+#endif
+#endif // !defined(__cpp_char8_t)
+
+TEST(Split, EmptyStringDelimiter) {
+ {
+ std::vector<std::string> v = absl::StrSplit("", "");
+ EXPECT_THAT(v, ElementsAre(""));
+ }
+
+ {
+ std::vector<std::string> v = absl::StrSplit("a", "");
+ EXPECT_THAT(v, ElementsAre("a"));
+ }
+
+ {
+ std::vector<std::string> v = absl::StrSplit("ab", "");
+ EXPECT_THAT(v, ElementsAre("a", "b"));
+ }
+
+ {
+ std::vector<std::string> v = absl::StrSplit("a b", "");
+ EXPECT_THAT(v, ElementsAre("a", " ", "b"));
+ }
+}
+
+TEST(Split, SubstrDelimiter) {
+ std::vector<absl::string_view> results;
+ absl::string_view delim("//");
+
+ results = absl::StrSplit("", delim);
+ EXPECT_THAT(results, ElementsAre(""));
+
+ results = absl::StrSplit("//", delim);
+ EXPECT_THAT(results, ElementsAre("", ""));
+
+ results = absl::StrSplit("ab", delim);
+ EXPECT_THAT(results, ElementsAre("ab"));
+
+ results = absl::StrSplit("ab//", delim);
+ EXPECT_THAT(results, ElementsAre("ab", ""));
+
+ results = absl::StrSplit("ab/", delim);
+ EXPECT_THAT(results, ElementsAre("ab/"));
+
+ results = absl::StrSplit("a/b", delim);
+ EXPECT_THAT(results, ElementsAre("a/b"));
+
+ results = absl::StrSplit("a//b", delim);
+ EXPECT_THAT(results, ElementsAre("a", "b"));
+
+ results = absl::StrSplit("a///b", delim);
+ EXPECT_THAT(results, ElementsAre("a", "/b"));
+
+ results = absl::StrSplit("a////b", delim);
+ EXPECT_THAT(results, ElementsAre("a", "", "b"));
+}
+
+TEST(Split, EmptyResults) {
+ std::vector<absl::string_view> results;
+
+ results = absl::StrSplit("", '#');
+ EXPECT_THAT(results, ElementsAre(""));
+
+ results = absl::StrSplit("#", '#');
+ EXPECT_THAT(results, ElementsAre("", ""));
+
+ results = absl::StrSplit("#cd", '#');
+ EXPECT_THAT(results, ElementsAre("", "cd"));
+
+ results = absl::StrSplit("ab#cd#", '#');
+ EXPECT_THAT(results, ElementsAre("ab", "cd", ""));
+
+ results = absl::StrSplit("ab##cd", '#');
+ EXPECT_THAT(results, ElementsAre("ab", "", "cd"));
+
+ results = absl::StrSplit("ab##", '#');
+ EXPECT_THAT(results, ElementsAre("ab", "", ""));
+
+ results = absl::StrSplit("ab#ab#", '#');
+ EXPECT_THAT(results, ElementsAre("ab", "ab", ""));
+
+ results = absl::StrSplit("aaaa", 'a');
+ EXPECT_THAT(results, ElementsAre("", "", "", "", ""));
+
+ results = absl::StrSplit("", '#', absl::SkipEmpty());
+ EXPECT_THAT(results, ElementsAre());
+}
+
+template <typename Delimiter>
+static bool IsFoundAtStartingPos(absl::string_view text, Delimiter d,
+ size_t starting_pos, int expected_pos) {
+ absl::string_view found = d.Find(text, starting_pos);
+ return found.data() != text.data() + text.size() &&
+ expected_pos == found.data() - text.data();
+}
+
+// Helper function for testing Delimiter objects. Returns true if the given
+// Delimiter is found in the given string at the given position. This function
+// tests two cases:
+// 1. The actual text given, staring at position 0
+// 2. The text given with leading padding that should be ignored
+template <typename Delimiter>
+static bool IsFoundAt(absl::string_view text, Delimiter d, int expected_pos) {
+ const std::string leading_text = ",x,y,z,";
+ return IsFoundAtStartingPos(text, d, 0, expected_pos) &&
+ IsFoundAtStartingPos(leading_text + std::string(text), d,
+ leading_text.length(),
+ expected_pos + leading_text.length());
+}
+
+//
+// Tests for ByString
+//
+
+// Tests using any delimiter that represents a single comma.
+template <typename Delimiter>
+void TestComma(Delimiter d) {
+ EXPECT_TRUE(IsFoundAt(",", d, 0));
+ EXPECT_TRUE(IsFoundAt("a,", d, 1));
+ EXPECT_TRUE(IsFoundAt(",b", d, 0));
+ EXPECT_TRUE(IsFoundAt("a,b", d, 1));
+ EXPECT_TRUE(IsFoundAt("a,b,", d, 1));
+ EXPECT_TRUE(IsFoundAt("a,b,c", d, 1));
+ EXPECT_FALSE(IsFoundAt("", d, -1));
+ EXPECT_FALSE(IsFoundAt(" ", d, -1));
+ EXPECT_FALSE(IsFoundAt("a", d, -1));
+ EXPECT_FALSE(IsFoundAt("a b c", d, -1));
+ EXPECT_FALSE(IsFoundAt("a;b;c", d, -1));
+ EXPECT_FALSE(IsFoundAt(";", d, -1));
+}
+
+TEST(Delimiter, ByString) {
+ using absl::ByString;
+ TestComma(ByString(","));
+
+ // Works as named variable.
+ ByString comma_string(",");
+ TestComma(comma_string);
+
+ // The first occurrence of empty string ("") in a string is at position 0.
+ // There is a test below that demonstrates this for absl::string_view::find().
+ // If the ByString delimiter returned position 0 for this, there would
+ // be an infinite loop in the SplitIterator code. To avoid this, empty string
+ // is a special case in that it always returns the item at position 1.
+ absl::string_view abc("abc");
+ EXPECT_EQ(0, abc.find("")); // "" is found at position 0
+ ByString empty("");
+ EXPECT_FALSE(IsFoundAt("", empty, 0));
+ EXPECT_FALSE(IsFoundAt("a", empty, 0));
+ EXPECT_TRUE(IsFoundAt("ab", empty, 1));
+ EXPECT_TRUE(IsFoundAt("abc", empty, 1));
+}
+
+TEST(Split, ByChar) {
+ using absl::ByChar;
+ TestComma(ByChar(','));
+
+ // Works as named variable.
+ ByChar comma_char(',');
+ TestComma(comma_char);
+}
+
+//
+// Tests for ByAnyChar
+//
+
+TEST(Delimiter, ByAnyChar) {
+ using absl::ByAnyChar;
+ ByAnyChar one_delim(",");
+ // Found
+ EXPECT_TRUE(IsFoundAt(",", one_delim, 0));
+ EXPECT_TRUE(IsFoundAt("a,", one_delim, 1));
+ EXPECT_TRUE(IsFoundAt("a,b", one_delim, 1));
+ EXPECT_TRUE(IsFoundAt(",b", one_delim, 0));
+ // Not found
+ EXPECT_FALSE(IsFoundAt("", one_delim, -1));
+ EXPECT_FALSE(IsFoundAt(" ", one_delim, -1));
+ EXPECT_FALSE(IsFoundAt("a", one_delim, -1));
+ EXPECT_FALSE(IsFoundAt("a;b;c", one_delim, -1));
+ EXPECT_FALSE(IsFoundAt(";", one_delim, -1));
+
+ ByAnyChar two_delims(",;");
+ // Found
+ EXPECT_TRUE(IsFoundAt(",", two_delims, 0));
+ EXPECT_TRUE(IsFoundAt(";", two_delims, 0));
+ EXPECT_TRUE(IsFoundAt(",;", two_delims, 0));
+ EXPECT_TRUE(IsFoundAt(";,", two_delims, 0));
+ EXPECT_TRUE(IsFoundAt(",;b", two_delims, 0));
+ EXPECT_TRUE(IsFoundAt(";,b", two_delims, 0));
+ EXPECT_TRUE(IsFoundAt("a;,", two_delims, 1));
+ EXPECT_TRUE(IsFoundAt("a,;", two_delims, 1));
+ EXPECT_TRUE(IsFoundAt("a;,b", two_delims, 1));
+ EXPECT_TRUE(IsFoundAt("a,;b", two_delims, 1));
+ // Not found
+ EXPECT_FALSE(IsFoundAt("", two_delims, -1));
+ EXPECT_FALSE(IsFoundAt(" ", two_delims, -1));
+ EXPECT_FALSE(IsFoundAt("a", two_delims, -1));
+ EXPECT_FALSE(IsFoundAt("a=b=c", two_delims, -1));
+ EXPECT_FALSE(IsFoundAt("=", two_delims, -1));
+
+ // ByAnyChar behaves just like ByString when given a delimiter of empty
+ // string. That is, it always returns a zero-length absl::string_view
+ // referring to the item at position 1, not position 0.
+ ByAnyChar empty("");
+ EXPECT_FALSE(IsFoundAt("", empty, 0));
+ EXPECT_FALSE(IsFoundAt("a", empty, 0));
+ EXPECT_TRUE(IsFoundAt("ab", empty, 1));
+ EXPECT_TRUE(IsFoundAt("abc", empty, 1));
+}
+
+//
+// Tests for ByLength
+//
+
+TEST(Delimiter, ByLength) {
+ using absl::ByLength;
+
+ ByLength four_char_delim(4);
+
+ // Found
+ EXPECT_TRUE(IsFoundAt("abcde", four_char_delim, 4));
+ EXPECT_TRUE(IsFoundAt("abcdefghijklmnopqrstuvwxyz", four_char_delim, 4));
+ EXPECT_TRUE(IsFoundAt("a b,c\nd", four_char_delim, 4));
+ // Not found
+ EXPECT_FALSE(IsFoundAt("", four_char_delim, 0));
+ EXPECT_FALSE(IsFoundAt("a", four_char_delim, 0));
+ EXPECT_FALSE(IsFoundAt("ab", four_char_delim, 0));
+ EXPECT_FALSE(IsFoundAt("abc", four_char_delim, 0));
+ EXPECT_FALSE(IsFoundAt("abcd", four_char_delim, 0));
+}
+
+TEST(Split, WorksWithLargeStrings) {
+ if (sizeof(size_t) > 4) {
+ std::string s((uint32_t{1} << 31) + 1, 'x'); // 2G + 1 byte
+ s.back() = '-';
+ std::vector<absl::string_view> v = absl::StrSplit(s, '-');
+ EXPECT_EQ(2, v.size());
+ // The first element will contain 2G of 'x's.
+ // testing::StartsWith is too slow with a 2G string.
+ EXPECT_EQ('x', v[0][0]);
+ EXPECT_EQ('x', v[0][1]);
+ EXPECT_EQ('x', v[0][3]);
+ EXPECT_EQ("", v[1]);
+ }
+}
+
+TEST(SplitInternalTest, TypeTraits) {
+ EXPECT_FALSE(absl::strings_internal::HasMappedType<int>::value);
+ EXPECT_TRUE(
+ (absl::strings_internal::HasMappedType<std::map<int, int>>::value));
+ EXPECT_FALSE(absl::strings_internal::HasValueType<int>::value);
+ EXPECT_TRUE(
+ (absl::strings_internal::HasValueType<std::map<int, int>>::value));
+ EXPECT_FALSE(absl::strings_internal::HasConstIterator<int>::value);
+ EXPECT_TRUE(
+ (absl::strings_internal::HasConstIterator<std::map<int, int>>::value));
+ EXPECT_FALSE(absl::strings_internal::IsInitializerList<int>::value);
+ EXPECT_TRUE((absl::strings_internal::IsInitializerList<
+ std::initializer_list<int>>::value));
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/strings/string_view.cc b/third_party/abseil/src/absl/strings/string_view.cc
new file mode 100644
index 0000000..c5f5de9
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/string_view.cc
@@ -0,0 +1,235 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/strings/string_view.h"
+
+#ifndef ABSL_USES_STD_STRING_VIEW
+
+#include <algorithm>
+#include <climits>
+#include <cstring>
+#include <ostream>
+
+#include "absl/strings/internal/memutil.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+namespace {
+void WritePadding(std::ostream& o, size_t pad) {
+ char fill_buf[32];
+ memset(fill_buf, o.fill(), sizeof(fill_buf));
+ while (pad) {
+ size_t n = std::min(pad, sizeof(fill_buf));
+ o.write(fill_buf, n);
+ pad -= n;
+ }
+}
+
+class LookupTable {
+ public:
+ // For each character in wanted, sets the index corresponding
+ // to the ASCII code of that character. This is used by
+ // the find_.*_of methods below to tell whether or not a character is in
+ // the lookup table in constant time.
+ explicit LookupTable(string_view wanted) {
+ for (char c : wanted) {
+ table_[Index(c)] = true;
+ }
+ }
+ bool operator[](char c) const { return table_[Index(c)]; }
+
+ private:
+ static unsigned char Index(char c) { return static_cast<unsigned char>(c); }
+ bool table_[UCHAR_MAX + 1] = {};
+};
+
+} // namespace
+
+std::ostream& operator<<(std::ostream& o, string_view piece) {
+ std::ostream::sentry sentry(o);
+ if (sentry) {
+ size_t lpad = 0;
+ size_t rpad = 0;
+ if (static_cast<size_t>(o.width()) > piece.size()) {
+ size_t pad = o.width() - piece.size();
+ if ((o.flags() & o.adjustfield) == o.left) {
+ rpad = pad;
+ } else {
+ lpad = pad;
+ }
+ }
+ if (lpad) WritePadding(o, lpad);
+ o.write(piece.data(), piece.size());
+ if (rpad) WritePadding(o, rpad);
+ o.width(0);
+ }
+ return o;
+}
+
+string_view::size_type string_view::find(string_view s, size_type pos) const
+ noexcept {
+ if (empty() || pos > length_) {
+ if (empty() && pos == 0 && s.empty()) return 0;
+ return npos;
+ }
+ const char* result =
+ strings_internal::memmatch(ptr_ + pos, length_ - pos, s.ptr_, s.length_);
+ return result ? result - ptr_ : npos;
+}
+
+string_view::size_type string_view::find(char c, size_type pos) const noexcept {
+ if (empty() || pos >= length_) {
+ return npos;
+ }
+ const char* result =
+ static_cast<const char*>(memchr(ptr_ + pos, c, length_ - pos));
+ return result != nullptr ? result - ptr_ : npos;
+}
+
+string_view::size_type string_view::rfind(string_view s, size_type pos) const
+ noexcept {
+ if (length_ < s.length_) return npos;
+ if (s.empty()) return std::min(length_, pos);
+ const char* last = ptr_ + std::min(length_ - s.length_, pos) + s.length_;
+ const char* result = std::find_end(ptr_, last, s.ptr_, s.ptr_ + s.length_);
+ return result != last ? result - ptr_ : npos;
+}
+
+// Search range is [0..pos] inclusive. If pos == npos, search everything.
+string_view::size_type string_view::rfind(char c, size_type pos) const
+ noexcept {
+ // Note: memrchr() is not available on Windows.
+ if (empty()) return npos;
+ for (size_type i = std::min(pos, length_ - 1);; --i) {
+ if (ptr_[i] == c) {
+ return i;
+ }
+ if (i == 0) break;
+ }
+ return npos;
+}
+
+string_view::size_type string_view::find_first_of(string_view s,
+ size_type pos) const
+ noexcept {
+ if (empty() || s.empty()) {
+ return npos;
+ }
+ // Avoid the cost of LookupTable() for a single-character search.
+ if (s.length_ == 1) return find_first_of(s.ptr_[0], pos);
+ LookupTable tbl(s);
+ for (size_type i = pos; i < length_; ++i) {
+ if (tbl[ptr_[i]]) {
+ return i;
+ }
+ }
+ return npos;
+}
+
+string_view::size_type string_view::find_first_not_of(string_view s,
+ size_type pos) const
+ noexcept {
+ if (empty()) return npos;
+ // Avoid the cost of LookupTable() for a single-character search.
+ if (s.length_ == 1) return find_first_not_of(s.ptr_[0], pos);
+ LookupTable tbl(s);
+ for (size_type i = pos; i < length_; ++i) {
+ if (!tbl[ptr_[i]]) {
+ return i;
+ }
+ }
+ return npos;
+}
+
+string_view::size_type string_view::find_first_not_of(char c,
+ size_type pos) const
+ noexcept {
+ if (empty()) return npos;
+ for (; pos < length_; ++pos) {
+ if (ptr_[pos] != c) {
+ return pos;
+ }
+ }
+ return npos;
+}
+
+string_view::size_type string_view::find_last_of(string_view s,
+ size_type pos) const noexcept {
+ if (empty() || s.empty()) return npos;
+ // Avoid the cost of LookupTable() for a single-character search.
+ if (s.length_ == 1) return find_last_of(s.ptr_[0], pos);
+ LookupTable tbl(s);
+ for (size_type i = std::min(pos, length_ - 1);; --i) {
+ if (tbl[ptr_[i]]) {
+ return i;
+ }
+ if (i == 0) break;
+ }
+ return npos;
+}
+
+string_view::size_type string_view::find_last_not_of(string_view s,
+ size_type pos) const
+ noexcept {
+ if (empty()) return npos;
+ size_type i = std::min(pos, length_ - 1);
+ if (s.empty()) return i;
+ // Avoid the cost of LookupTable() for a single-character search.
+ if (s.length_ == 1) return find_last_not_of(s.ptr_[0], pos);
+ LookupTable tbl(s);
+ for (;; --i) {
+ if (!tbl[ptr_[i]]) {
+ return i;
+ }
+ if (i == 0) break;
+ }
+ return npos;
+}
+
+string_view::size_type string_view::find_last_not_of(char c,
+ size_type pos) const
+ noexcept {
+ if (empty()) return npos;
+ size_type i = std::min(pos, length_ - 1);
+ for (;; --i) {
+ if (ptr_[i] != c) {
+ return i;
+ }
+ if (i == 0) break;
+ }
+ return npos;
+}
+
+// MSVC has non-standard behavior that implicitly creates definitions for static
+// const members. These implicit definitions conflict with explicit out-of-class
+// member definitions that are required by the C++ standard, resulting in
+// LNK1169 "multiply defined" errors at link time. __declspec(selectany) asks
+// MSVC to choose only one definition for the symbol it decorates. See details
+// at https://msdn.microsoft.com/en-us/library/34h23df8(v=vs.100).aspx
+#ifdef _MSC_VER
+#define ABSL_STRING_VIEW_SELECTANY __declspec(selectany)
+#else
+#define ABSL_STRING_VIEW_SELECTANY
+#endif
+
+ABSL_STRING_VIEW_SELECTANY
+constexpr string_view::size_type string_view::npos;
+ABSL_STRING_VIEW_SELECTANY
+constexpr string_view::size_type string_view::kMaxSize;
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_USES_STD_STRING_VIEW
diff --git a/third_party/abseil/src/absl/strings/string_view.h b/third_party/abseil/src/absl/strings/string_view.h
new file mode 100644
index 0000000..5260b5b
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/string_view.h
@@ -0,0 +1,629 @@
+//
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: string_view.h
+// -----------------------------------------------------------------------------
+//
+// This file contains the definition of the `absl::string_view` class. A
+// `string_view` points to a contiguous span of characters, often part or all of
+// another `std::string`, double-quoted string literal, character array, or even
+// another `string_view`.
+//
+// This `absl::string_view` abstraction is designed to be a drop-in
+// replacement for the C++17 `std::string_view` abstraction.
+#ifndef ABSL_STRINGS_STRING_VIEW_H_
+#define ABSL_STRINGS_STRING_VIEW_H_
+
+#include <algorithm>
+#include <cassert>
+#include <cstddef>
+#include <cstring>
+#include <iosfwd>
+#include <iterator>
+#include <limits>
+#include <string>
+
+#include "absl/base/config.h"
+#include "absl/base/internal/throw_delegate.h"
+#include "absl/base/macros.h"
+#include "absl/base/optimization.h"
+#include "absl/base/port.h"
+
+#ifdef ABSL_USES_STD_STRING_VIEW
+
+#include <string_view> // IWYU pragma: export
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+using string_view = std::string_view;
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#else // ABSL_USES_STD_STRING_VIEW
+
+#if ABSL_HAVE_BUILTIN(__builtin_memcmp) || \
+ (defined(__GNUC__) && !defined(__clang__))
+#define ABSL_INTERNAL_STRING_VIEW_MEMCMP __builtin_memcmp
+#else // ABSL_HAVE_BUILTIN(__builtin_memcmp)
+#define ABSL_INTERNAL_STRING_VIEW_MEMCMP memcmp
+#endif // ABSL_HAVE_BUILTIN(__builtin_memcmp)
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+// absl::string_view
+//
+// A `string_view` provides a lightweight view into the string data provided by
+// a `std::string`, double-quoted string literal, character array, or even
+// another `string_view`. A `string_view` does *not* own the string to which it
+// points, and that data cannot be modified through the view.
+//
+// You can use `string_view` as a function or method parameter anywhere a
+// parameter can receive a double-quoted string literal, `const char*`,
+// `std::string`, or another `absl::string_view` argument with no need to copy
+// the string data. Systematic use of `string_view` within function arguments
+// reduces data copies and `strlen()` calls.
+//
+// Because of its small size, prefer passing `string_view` by value:
+//
+// void MyFunction(absl::string_view arg);
+//
+// If circumstances require, you may also pass one by const reference:
+//
+// void MyFunction(const absl::string_view& arg); // not preferred
+//
+// Passing by value generates slightly smaller code for many architectures.
+//
+// In either case, the source data of the `string_view` must outlive the
+// `string_view` itself.
+//
+// A `string_view` is also suitable for local variables if you know that the
+// lifetime of the underlying object is longer than the lifetime of your
+// `string_view` variable. However, beware of binding a `string_view` to a
+// temporary value:
+//
+// // BAD use of string_view: lifetime problem
+// absl::string_view sv = obj.ReturnAString();
+//
+// // GOOD use of string_view: str outlives sv
+// std::string str = obj.ReturnAString();
+// absl::string_view sv = str;
+//
+// Due to lifetime issues, a `string_view` is sometimes a poor choice for a
+// return value and usually a poor choice for a data member. If you do use a
+// `string_view` this way, it is your responsibility to ensure that the object
+// pointed to by the `string_view` outlives the `string_view`.
+//
+// A `string_view` may represent a whole string or just part of a string. For
+// example, when splitting a string, `std::vector<absl::string_view>` is a
+// natural data type for the output.
+//
+// For another example, a Cord is a non-contiguous, potentially very
+// long string-like object. The Cord class has an interface that iteratively
+// provides string_view objects that point to the successive pieces of a Cord
+// object.
+//
+// When constructed from a source which is NUL-terminated, the `string_view`
+// itself will not include the NUL-terminator unless a specific size (including
+// the NUL) is passed to the constructor. As a result, common idioms that work
+// on NUL-terminated strings do not work on `string_view` objects. If you write
+// code that scans a `string_view`, you must check its length rather than test
+// for nul, for example. Note, however, that nuls may still be embedded within
+// a `string_view` explicitly.
+//
+// You may create a null `string_view` in two ways:
+//
+// absl::string_view sv;
+// absl::string_view sv(nullptr, 0);
+//
+// For the above, `sv.data() == nullptr`, `sv.length() == 0`, and
+// `sv.empty() == true`. Also, if you create a `string_view` with a non-null
+// pointer then `sv.data() != nullptr`. Thus, you can use `string_view()` to
+// signal an undefined value that is different from other `string_view` values
+// in a similar fashion to how `const char* p1 = nullptr;` is different from
+// `const char* p2 = "";`. However, in practice, it is not recommended to rely
+// on this behavior.
+//
+// Be careful not to confuse a null `string_view` with an empty one. A null
+// `string_view` is an empty `string_view`, but some empty `string_view`s are
+// not null. Prefer checking for emptiness over checking for null.
+//
+// There are many ways to create an empty string_view:
+//
+// const char* nullcp = nullptr;
+// // string_view.size() will return 0 in all cases.
+// absl::string_view();
+// absl::string_view(nullcp, 0);
+// absl::string_view("");
+// absl::string_view("", 0);
+// absl::string_view("abcdef", 0);
+// absl::string_view("abcdef" + 6, 0);
+//
+// All empty `string_view` objects whether null or not, are equal:
+//
+// absl::string_view() == absl::string_view("", 0)
+// absl::string_view(nullptr, 0) == absl::string_view("abcdef"+6, 0)
+class string_view {
+ public:
+ using traits_type = std::char_traits<char>;
+ using value_type = char;
+ using pointer = char*;
+ using const_pointer = const char*;
+ using reference = char&;
+ using const_reference = const char&;
+ using const_iterator = const char*;
+ using iterator = const_iterator;
+ using const_reverse_iterator = std::reverse_iterator<const_iterator>;
+ using reverse_iterator = const_reverse_iterator;
+ using size_type = size_t;
+ using difference_type = std::ptrdiff_t;
+
+ static constexpr size_type npos = static_cast<size_type>(-1);
+
+ // Null `string_view` constructor
+ constexpr string_view() noexcept : ptr_(nullptr), length_(0) {}
+
+ // Implicit constructors
+
+ template <typename Allocator>
+ string_view( // NOLINT(runtime/explicit)
+ const std::basic_string<char, std::char_traits<char>, Allocator>&
+ str) noexcept
+ // This is implemented in terms of `string_view(p, n)` so `str.size()`
+ // doesn't need to be reevaluated after `ptr_` is set.
+ : string_view(str.data(), str.size()) {}
+
+ // Implicit constructor of a `string_view` from NUL-terminated `str`. When
+ // accepting possibly null strings, use `absl::NullSafeStringView(str)`
+ // instead (see below).
+ constexpr string_view(const char* str) // NOLINT(runtime/explicit)
+ : ptr_(str),
+ length_(str ? CheckLengthInternal(StrlenInternal(str)) : 0) {}
+
+ // Implicit constructor of a `string_view` from a `const char*` and length.
+ constexpr string_view(const char* data, size_type len)
+ : ptr_(data), length_(CheckLengthInternal(len)) {}
+
+ // NOTE: Harmlessly omitted to work around gdb bug.
+ // constexpr string_view(const string_view&) noexcept = default;
+ // string_view& operator=(const string_view&) noexcept = default;
+
+ // Iterators
+
+ // string_view::begin()
+ //
+ // Returns an iterator pointing to the first character at the beginning of the
+ // `string_view`, or `end()` if the `string_view` is empty.
+ constexpr const_iterator begin() const noexcept { return ptr_; }
+
+ // string_view::end()
+ //
+ // Returns an iterator pointing just beyond the last character at the end of
+ // the `string_view`. This iterator acts as a placeholder; attempting to
+ // access it results in undefined behavior.
+ constexpr const_iterator end() const noexcept { return ptr_ + length_; }
+
+ // string_view::cbegin()
+ //
+ // Returns a const iterator pointing to the first character at the beginning
+ // of the `string_view`, or `end()` if the `string_view` is empty.
+ constexpr const_iterator cbegin() const noexcept { return begin(); }
+
+ // string_view::cend()
+ //
+ // Returns a const iterator pointing just beyond the last character at the end
+ // of the `string_view`. This pointer acts as a placeholder; attempting to
+ // access its element results in undefined behavior.
+ constexpr const_iterator cend() const noexcept { return end(); }
+
+ // string_view::rbegin()
+ //
+ // Returns a reverse iterator pointing to the last character at the end of the
+ // `string_view`, or `rend()` if the `string_view` is empty.
+ const_reverse_iterator rbegin() const noexcept {
+ return const_reverse_iterator(end());
+ }
+
+ // string_view::rend()
+ //
+ // Returns a reverse iterator pointing just before the first character at the
+ // beginning of the `string_view`. This pointer acts as a placeholder;
+ // attempting to access its element results in undefined behavior.
+ const_reverse_iterator rend() const noexcept {
+ return const_reverse_iterator(begin());
+ }
+
+ // string_view::crbegin()
+ //
+ // Returns a const reverse iterator pointing to the last character at the end
+ // of the `string_view`, or `crend()` if the `string_view` is empty.
+ const_reverse_iterator crbegin() const noexcept { return rbegin(); }
+
+ // string_view::crend()
+ //
+ // Returns a const reverse iterator pointing just before the first character
+ // at the beginning of the `string_view`. This pointer acts as a placeholder;
+ // attempting to access its element results in undefined behavior.
+ const_reverse_iterator crend() const noexcept { return rend(); }
+
+ // Capacity Utilities
+
+ // string_view::size()
+ //
+ // Returns the number of characters in the `string_view`.
+ constexpr size_type size() const noexcept {
+ return length_;
+ }
+
+ // string_view::length()
+ //
+ // Returns the number of characters in the `string_view`. Alias for `size()`.
+ constexpr size_type length() const noexcept { return size(); }
+
+ // string_view::max_size()
+ //
+ // Returns the maximum number of characters the `string_view` can hold.
+ constexpr size_type max_size() const noexcept { return kMaxSize; }
+
+ // string_view::empty()
+ //
+ // Checks if the `string_view` is empty (refers to no characters).
+ constexpr bool empty() const noexcept { return length_ == 0; }
+
+ // string_view::operator[]
+ //
+ // Returns the ith element of the `string_view` using the array operator.
+ // Note that this operator does not perform any bounds checking.
+ constexpr const_reference operator[](size_type i) const {
+ return ABSL_HARDENING_ASSERT(i < size()), ptr_[i];
+ }
+
+ // string_view::at()
+ //
+ // Returns the ith element of the `string_view`. Bounds checking is performed,
+ // and an exception of type `std::out_of_range` will be thrown on invalid
+ // access.
+ constexpr const_reference at(size_type i) const {
+ return ABSL_PREDICT_TRUE(i < size())
+ ? ptr_[i]
+ : ((void)base_internal::ThrowStdOutOfRange(
+ "absl::string_view::at"),
+ ptr_[i]);
+ }
+
+ // string_view::front()
+ //
+ // Returns the first element of a `string_view`.
+ constexpr const_reference front() const {
+ return ABSL_HARDENING_ASSERT(!empty()), ptr_[0];
+ }
+
+ // string_view::back()
+ //
+ // Returns the last element of a `string_view`.
+ constexpr const_reference back() const {
+ return ABSL_HARDENING_ASSERT(!empty()), ptr_[size() - 1];
+ }
+
+ // string_view::data()
+ //
+ // Returns a pointer to the underlying character array (which is of course
+ // stored elsewhere). Note that `string_view::data()` may contain embedded nul
+ // characters, but the returned buffer may or may not be NUL-terminated;
+ // therefore, do not pass `data()` to a routine that expects a NUL-terminated
+ // string.
+ constexpr const_pointer data() const noexcept { return ptr_; }
+
+ // Modifiers
+
+ // string_view::remove_prefix()
+ //
+ // Removes the first `n` characters from the `string_view`. Note that the
+ // underlying string is not changed, only the view.
+ void remove_prefix(size_type n) {
+ ABSL_HARDENING_ASSERT(n <= length_);
+ ptr_ += n;
+ length_ -= n;
+ }
+
+ // string_view::remove_suffix()
+ //
+ // Removes the last `n` characters from the `string_view`. Note that the
+ // underlying string is not changed, only the view.
+ void remove_suffix(size_type n) {
+ ABSL_HARDENING_ASSERT(n <= length_);
+ length_ -= n;
+ }
+
+ // string_view::swap()
+ //
+ // Swaps this `string_view` with another `string_view`.
+ void swap(string_view& s) noexcept {
+ auto t = *this;
+ *this = s;
+ s = t;
+ }
+
+ // Explicit conversion operators
+
+ // Converts to `std::basic_string`.
+ template <typename A>
+ explicit operator std::basic_string<char, traits_type, A>() const {
+ if (!data()) return {};
+ return std::basic_string<char, traits_type, A>(data(), size());
+ }
+
+ // string_view::copy()
+ //
+ // Copies the contents of the `string_view` at offset `pos` and length `n`
+ // into `buf`.
+ size_type copy(char* buf, size_type n, size_type pos = 0) const {
+ if (ABSL_PREDICT_FALSE(pos > length_)) {
+ base_internal::ThrowStdOutOfRange("absl::string_view::copy");
+ }
+ size_type rlen = (std::min)(length_ - pos, n);
+ if (rlen > 0) {
+ const char* start = ptr_ + pos;
+ traits_type::copy(buf, start, rlen);
+ }
+ return rlen;
+ }
+
+ // string_view::substr()
+ //
+ // Returns a "substring" of the `string_view` (at offset `pos` and length
+ // `n`) as another string_view. This function throws `std::out_of_bounds` if
+ // `pos > size`.
+ // Use absl::ClippedSubstr if you need a truncating substr operation.
+ constexpr string_view substr(size_type pos, size_type n = npos) const {
+ return ABSL_PREDICT_FALSE(pos > length_)
+ ? (base_internal::ThrowStdOutOfRange(
+ "absl::string_view::substr"),
+ string_view())
+ : string_view(ptr_ + pos, Min(n, length_ - pos));
+ }
+
+ // string_view::compare()
+ //
+ // Performs a lexicographical comparison between the `string_view` and
+ // another `absl::string_view`, returning -1 if `this` is less than, 0 if
+ // `this` is equal to, and 1 if `this` is greater than the passed string
+ // view. Note that in the case of data equality, a further comparison is made
+ // on the respective sizes of the two `string_view`s to determine which is
+ // smaller, equal, or greater.
+ constexpr int compare(string_view x) const noexcept {
+ return CompareImpl(length_, x.length_,
+ Min(length_, x.length_) == 0
+ ? 0
+ : ABSL_INTERNAL_STRING_VIEW_MEMCMP(
+ ptr_, x.ptr_, Min(length_, x.length_)));
+ }
+
+ // Overload of `string_view::compare()` for comparing a substring of the
+ // 'string_view` and another `absl::string_view`.
+ int compare(size_type pos1, size_type count1, string_view v) const {
+ return substr(pos1, count1).compare(v);
+ }
+
+ // Overload of `string_view::compare()` for comparing a substring of the
+ // `string_view` and a substring of another `absl::string_view`.
+ int compare(size_type pos1, size_type count1, string_view v, size_type pos2,
+ size_type count2) const {
+ return substr(pos1, count1).compare(v.substr(pos2, count2));
+ }
+
+ // Overload of `string_view::compare()` for comparing a `string_view` and a
+ // a different C-style string `s`.
+ int compare(const char* s) const { return compare(string_view(s)); }
+
+ // Overload of `string_view::compare()` for comparing a substring of the
+ // `string_view` and a different string C-style string `s`.
+ int compare(size_type pos1, size_type count1, const char* s) const {
+ return substr(pos1, count1).compare(string_view(s));
+ }
+
+ // Overload of `string_view::compare()` for comparing a substring of the
+ // `string_view` and a substring of a different C-style string `s`.
+ int compare(size_type pos1, size_type count1, const char* s,
+ size_type count2) const {
+ return substr(pos1, count1).compare(string_view(s, count2));
+ }
+
+ // Find Utilities
+
+ // string_view::find()
+ //
+ // Finds the first occurrence of the substring `s` within the `string_view`,
+ // returning the position of the first character's match, or `npos` if no
+ // match was found.
+ size_type find(string_view s, size_type pos = 0) const noexcept;
+
+ // Overload of `string_view::find()` for finding the given character `c`
+ // within the `string_view`.
+ size_type find(char c, size_type pos = 0) const noexcept;
+
+ // string_view::rfind()
+ //
+ // Finds the last occurrence of a substring `s` within the `string_view`,
+ // returning the position of the first character's match, or `npos` if no
+ // match was found.
+ size_type rfind(string_view s, size_type pos = npos) const
+ noexcept;
+
+ // Overload of `string_view::rfind()` for finding the last given character `c`
+ // within the `string_view`.
+ size_type rfind(char c, size_type pos = npos) const noexcept;
+
+ // string_view::find_first_of()
+ //
+ // Finds the first occurrence of any of the characters in `s` within the
+ // `string_view`, returning the start position of the match, or `npos` if no
+ // match was found.
+ size_type find_first_of(string_view s, size_type pos = 0) const
+ noexcept;
+
+ // Overload of `string_view::find_first_of()` for finding a character `c`
+ // within the `string_view`.
+ size_type find_first_of(char c, size_type pos = 0) const
+ noexcept {
+ return find(c, pos);
+ }
+
+ // string_view::find_last_of()
+ //
+ // Finds the last occurrence of any of the characters in `s` within the
+ // `string_view`, returning the start position of the match, or `npos` if no
+ // match was found.
+ size_type find_last_of(string_view s, size_type pos = npos) const
+ noexcept;
+
+ // Overload of `string_view::find_last_of()` for finding a character `c`
+ // within the `string_view`.
+ size_type find_last_of(char c, size_type pos = npos) const
+ noexcept {
+ return rfind(c, pos);
+ }
+
+ // string_view::find_first_not_of()
+ //
+ // Finds the first occurrence of any of the characters not in `s` within the
+ // `string_view`, returning the start position of the first non-match, or
+ // `npos` if no non-match was found.
+ size_type find_first_not_of(string_view s, size_type pos = 0) const noexcept;
+
+ // Overload of `string_view::find_first_not_of()` for finding a character
+ // that is not `c` within the `string_view`.
+ size_type find_first_not_of(char c, size_type pos = 0) const noexcept;
+
+ // string_view::find_last_not_of()
+ //
+ // Finds the last occurrence of any of the characters not in `s` within the
+ // `string_view`, returning the start position of the last non-match, or
+ // `npos` if no non-match was found.
+ size_type find_last_not_of(string_view s,
+ size_type pos = npos) const noexcept;
+
+ // Overload of `string_view::find_last_not_of()` for finding a character
+ // that is not `c` within the `string_view`.
+ size_type find_last_not_of(char c, size_type pos = npos) const
+ noexcept;
+
+ private:
+ static constexpr size_type kMaxSize =
+ (std::numeric_limits<difference_type>::max)();
+
+ static constexpr size_type CheckLengthInternal(size_type len) {
+ return ABSL_HARDENING_ASSERT(len <= kMaxSize), len;
+ }
+
+ static constexpr size_type StrlenInternal(const char* str) {
+#if defined(_MSC_VER) && _MSC_VER >= 1910 && !defined(__clang__)
+ // MSVC 2017+ can evaluate this at compile-time.
+ const char* begin = str;
+ while (*str != '\0') ++str;
+ return str - begin;
+#elif ABSL_HAVE_BUILTIN(__builtin_strlen) || \
+ (defined(__GNUC__) && !defined(__clang__))
+ // GCC has __builtin_strlen according to
+ // https://gcc.gnu.org/onlinedocs/gcc-4.7.0/gcc/Other-Builtins.html, but
+ // ABSL_HAVE_BUILTIN doesn't detect that, so we use the extra checks above.
+ // __builtin_strlen is constexpr.
+ return __builtin_strlen(str);
+#else
+ return str ? strlen(str) : 0;
+#endif
+ }
+
+ static constexpr size_t Min(size_type length_a, size_type length_b) {
+ return length_a < length_b ? length_a : length_b;
+ }
+
+ static constexpr int CompareImpl(size_type length_a, size_type length_b,
+ int compare_result) {
+ return compare_result == 0 ? static_cast<int>(length_a > length_b) -
+ static_cast<int>(length_a < length_b)
+ : (compare_result < 0 ? -1 : 1);
+ }
+
+ const char* ptr_;
+ size_type length_;
+};
+
+// This large function is defined inline so that in a fairly common case where
+// one of the arguments is a literal, the compiler can elide a lot of the
+// following comparisons.
+constexpr bool operator==(string_view x, string_view y) noexcept {
+ return x.size() == y.size() &&
+ (x.empty() ||
+ ABSL_INTERNAL_STRING_VIEW_MEMCMP(x.data(), y.data(), x.size()) == 0);
+}
+
+constexpr bool operator!=(string_view x, string_view y) noexcept {
+ return !(x == y);
+}
+
+constexpr bool operator<(string_view x, string_view y) noexcept {
+ return x.compare(y) < 0;
+}
+
+constexpr bool operator>(string_view x, string_view y) noexcept {
+ return y < x;
+}
+
+constexpr bool operator<=(string_view x, string_view y) noexcept {
+ return !(y < x);
+}
+
+constexpr bool operator>=(string_view x, string_view y) noexcept {
+ return !(x < y);
+}
+
+// IO Insertion Operator
+std::ostream& operator<<(std::ostream& o, string_view piece);
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#undef ABSL_INTERNAL_STRING_VIEW_MEMCMP
+
+#endif // ABSL_USES_STD_STRING_VIEW
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+// ClippedSubstr()
+//
+// Like `s.substr(pos, n)`, but clips `pos` to an upper bound of `s.size()`.
+// Provided because std::string_view::substr throws if `pos > size()`
+inline string_view ClippedSubstr(string_view s, size_t pos,
+ size_t n = string_view::npos) {
+ pos = (std::min)(pos, static_cast<size_t>(s.size()));
+ return s.substr(pos, n);
+}
+
+// NullSafeStringView()
+//
+// Creates an `absl::string_view` from a pointer `p` even if it's null-valued.
+// This function should be used where an `absl::string_view` can be created from
+// a possibly-null pointer.
+constexpr string_view NullSafeStringView(const char* p) {
+ return p ? string_view(p) : string_view();
+}
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_STRINGS_STRING_VIEW_H_
diff --git a/third_party/abseil/src/absl/strings/string_view_benchmark.cc b/third_party/abseil/src/absl/strings/string_view_benchmark.cc
new file mode 100644
index 0000000..0d74e23
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/string_view_benchmark.cc
@@ -0,0 +1,381 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/strings/string_view.h"
+
+#include <algorithm>
+#include <cstdint>
+#include <map>
+#include <random>
+#include <string>
+#include <unordered_set>
+#include <vector>
+
+#include "benchmark/benchmark.h"
+#include "absl/base/attributes.h"
+#include "absl/base/internal/raw_logging.h"
+#include "absl/base/macros.h"
+#include "absl/strings/str_cat.h"
+
+namespace {
+
+void BM_StringViewFromString(benchmark::State& state) {
+ std::string s(state.range(0), 'x');
+ std::string* ps = &s;
+ struct SV {
+ SV() = default;
+ explicit SV(const std::string& s) : sv(s) {}
+ absl::string_view sv;
+ } sv;
+ SV* psv = &sv;
+ benchmark::DoNotOptimize(ps);
+ benchmark::DoNotOptimize(psv);
+ for (auto _ : state) {
+ new (psv) SV(*ps);
+ benchmark::DoNotOptimize(sv);
+ }
+}
+BENCHMARK(BM_StringViewFromString)->Arg(12)->Arg(128);
+
+// Provide a forcibly out-of-line wrapper for operator== that can be used in
+// benchmarks to measure the impact of inlining.
+ABSL_ATTRIBUTE_NOINLINE
+bool NonInlinedEq(absl::string_view a, absl::string_view b) { return a == b; }
+
+// We use functions that cannot be inlined to perform the comparison loops so
+// that inlining of the operator== can't optimize away *everything*.
+ABSL_ATTRIBUTE_NOINLINE
+void DoEqualityComparisons(benchmark::State& state, absl::string_view a,
+ absl::string_view b) {
+ for (auto _ : state) {
+ benchmark::DoNotOptimize(a == b);
+ }
+}
+
+void BM_EqualIdentical(benchmark::State& state) {
+ std::string x(state.range(0), 'a');
+ DoEqualityComparisons(state, x, x);
+}
+BENCHMARK(BM_EqualIdentical)->DenseRange(0, 3)->Range(4, 1 << 10);
+
+void BM_EqualSame(benchmark::State& state) {
+ std::string x(state.range(0), 'a');
+ std::string y = x;
+ DoEqualityComparisons(state, x, y);
+}
+BENCHMARK(BM_EqualSame)
+ ->DenseRange(0, 10)
+ ->Arg(20)
+ ->Arg(40)
+ ->Arg(70)
+ ->Arg(110)
+ ->Range(160, 4096);
+
+void BM_EqualDifferent(benchmark::State& state) {
+ const int len = state.range(0);
+ std::string x(len, 'a');
+ std::string y = x;
+ if (len > 0) {
+ y[len - 1] = 'b';
+ }
+ DoEqualityComparisons(state, x, y);
+}
+BENCHMARK(BM_EqualDifferent)->DenseRange(0, 3)->Range(4, 1 << 10);
+
+// This benchmark is intended to check that important simplifications can be
+// made with absl::string_view comparisons against constant strings. The idea is
+// that if constant strings cause redundant components of the comparison, the
+// compiler should detect and eliminate them. Here we use 8 different strings,
+// each with the same size. Provided our comparison makes the implementation
+// inline-able by the compiler, it should fold all of these away into a single
+// size check once per loop iteration.
+ABSL_ATTRIBUTE_NOINLINE
+void DoConstantSizeInlinedEqualityComparisons(benchmark::State& state,
+ absl::string_view a) {
+ for (auto _ : state) {
+ benchmark::DoNotOptimize(a == "aaa");
+ benchmark::DoNotOptimize(a == "bbb");
+ benchmark::DoNotOptimize(a == "ccc");
+ benchmark::DoNotOptimize(a == "ddd");
+ benchmark::DoNotOptimize(a == "eee");
+ benchmark::DoNotOptimize(a == "fff");
+ benchmark::DoNotOptimize(a == "ggg");
+ benchmark::DoNotOptimize(a == "hhh");
+ }
+}
+void BM_EqualConstantSizeInlined(benchmark::State& state) {
+ std::string x(state.range(0), 'a');
+ DoConstantSizeInlinedEqualityComparisons(state, x);
+}
+// We only need to check for size of 3, and <> 3 as this benchmark only has to
+// do with size differences.
+BENCHMARK(BM_EqualConstantSizeInlined)->DenseRange(2, 4);
+
+// This benchmark exists purely to give context to the above timings: this is
+// what they would look like if the compiler is completely unable to simplify
+// between two comparisons when they are comparing against constant strings.
+ABSL_ATTRIBUTE_NOINLINE
+void DoConstantSizeNonInlinedEqualityComparisons(benchmark::State& state,
+ absl::string_view a) {
+ for (auto _ : state) {
+ // Force these out-of-line to compare with the above function.
+ benchmark::DoNotOptimize(NonInlinedEq(a, "aaa"));
+ benchmark::DoNotOptimize(NonInlinedEq(a, "bbb"));
+ benchmark::DoNotOptimize(NonInlinedEq(a, "ccc"));
+ benchmark::DoNotOptimize(NonInlinedEq(a, "ddd"));
+ benchmark::DoNotOptimize(NonInlinedEq(a, "eee"));
+ benchmark::DoNotOptimize(NonInlinedEq(a, "fff"));
+ benchmark::DoNotOptimize(NonInlinedEq(a, "ggg"));
+ benchmark::DoNotOptimize(NonInlinedEq(a, "hhh"));
+ }
+}
+
+void BM_EqualConstantSizeNonInlined(benchmark::State& state) {
+ std::string x(state.range(0), 'a');
+ DoConstantSizeNonInlinedEqualityComparisons(state, x);
+}
+// We only need to check for size of 3, and <> 3 as this benchmark only has to
+// do with size differences.
+BENCHMARK(BM_EqualConstantSizeNonInlined)->DenseRange(2, 4);
+
+void BM_CompareSame(benchmark::State& state) {
+ const int len = state.range(0);
+ std::string x;
+ for (int i = 0; i < len; i++) {
+ x += 'a';
+ }
+ std::string y = x;
+ absl::string_view a = x;
+ absl::string_view b = y;
+
+ for (auto _ : state) {
+ benchmark::DoNotOptimize(a);
+ benchmark::DoNotOptimize(b);
+ benchmark::DoNotOptimize(a.compare(b));
+ }
+}
+BENCHMARK(BM_CompareSame)->DenseRange(0, 3)->Range(4, 1 << 10);
+
+void BM_CompareFirstOneLess(benchmark::State& state) {
+ const int len = state.range(0);
+ std::string x(len, 'a');
+ std::string y = x;
+ y.back() = 'b';
+ absl::string_view a = x;
+ absl::string_view b = y;
+
+ for (auto _ : state) {
+ benchmark::DoNotOptimize(a);
+ benchmark::DoNotOptimize(b);
+ benchmark::DoNotOptimize(a.compare(b));
+ }
+}
+BENCHMARK(BM_CompareFirstOneLess)->DenseRange(1, 3)->Range(4, 1 << 10);
+
+void BM_CompareSecondOneLess(benchmark::State& state) {
+ const int len = state.range(0);
+ std::string x(len, 'a');
+ std::string y = x;
+ x.back() = 'b';
+ absl::string_view a = x;
+ absl::string_view b = y;
+
+ for (auto _ : state) {
+ benchmark::DoNotOptimize(a);
+ benchmark::DoNotOptimize(b);
+ benchmark::DoNotOptimize(a.compare(b));
+ }
+}
+BENCHMARK(BM_CompareSecondOneLess)->DenseRange(1, 3)->Range(4, 1 << 10);
+
+void BM_find_string_view_len_one(benchmark::State& state) {
+ std::string haystack(state.range(0), '0');
+ absl::string_view s(haystack);
+ for (auto _ : state) {
+ benchmark::DoNotOptimize(s.find("x")); // not present; length 1
+ }
+}
+BENCHMARK(BM_find_string_view_len_one)->Range(1, 1 << 20);
+
+void BM_find_string_view_len_two(benchmark::State& state) {
+ std::string haystack(state.range(0), '0');
+ absl::string_view s(haystack);
+ for (auto _ : state) {
+ benchmark::DoNotOptimize(s.find("xx")); // not present; length 2
+ }
+}
+BENCHMARK(BM_find_string_view_len_two)->Range(1, 1 << 20);
+
+void BM_find_one_char(benchmark::State& state) {
+ std::string haystack(state.range(0), '0');
+ absl::string_view s(haystack);
+ for (auto _ : state) {
+ benchmark::DoNotOptimize(s.find('x')); // not present
+ }
+}
+BENCHMARK(BM_find_one_char)->Range(1, 1 << 20);
+
+void BM_rfind_one_char(benchmark::State& state) {
+ std::string haystack(state.range(0), '0');
+ absl::string_view s(haystack);
+ for (auto _ : state) {
+ benchmark::DoNotOptimize(s.rfind('x')); // not present
+ }
+}
+BENCHMARK(BM_rfind_one_char)->Range(1, 1 << 20);
+
+void BM_worst_case_find_first_of(benchmark::State& state, int haystack_len) {
+ const int needle_len = state.range(0);
+ std::string needle;
+ for (int i = 0; i < needle_len; ++i) {
+ needle += 'a' + i;
+ }
+ std::string haystack(haystack_len, '0'); // 1000 zeros.
+
+ absl::string_view s(haystack);
+ for (auto _ : state) {
+ benchmark::DoNotOptimize(s.find_first_of(needle));
+ }
+}
+
+void BM_find_first_of_short(benchmark::State& state) {
+ BM_worst_case_find_first_of(state, 10);
+}
+
+void BM_find_first_of_medium(benchmark::State& state) {
+ BM_worst_case_find_first_of(state, 100);
+}
+
+void BM_find_first_of_long(benchmark::State& state) {
+ BM_worst_case_find_first_of(state, 1000);
+}
+
+BENCHMARK(BM_find_first_of_short)->DenseRange(0, 4)->Arg(8)->Arg(16)->Arg(32);
+BENCHMARK(BM_find_first_of_medium)->DenseRange(0, 4)->Arg(8)->Arg(16)->Arg(32);
+BENCHMARK(BM_find_first_of_long)->DenseRange(0, 4)->Arg(8)->Arg(16)->Arg(32);
+
+struct EasyMap : public std::map<absl::string_view, uint64_t> {
+ explicit EasyMap(size_t) {}
+};
+
+// This templated benchmark helper function is intended to stress operator== or
+// operator< in a realistic test. It surely isn't entirely realistic, but it's
+// a start. The test creates a map of type Map, a template arg, and populates
+// it with table_size key/value pairs. Each key has WordsPerKey words. After
+// creating the map, a number of lookups are done in random order. Some keys
+// are used much more frequently than others in this phase of the test.
+template <typename Map, int WordsPerKey>
+void StringViewMapBenchmark(benchmark::State& state) {
+ const int table_size = state.range(0);
+ const double kFractionOfKeysThatAreHot = 0.2;
+ const int kNumLookupsOfHotKeys = 20;
+ const int kNumLookupsOfColdKeys = 1;
+ const char* words[] = {"the", "quick", "brown", "fox", "jumped",
+ "over", "the", "lazy", "dog", "and",
+ "found", "a", "large", "mushroom", "and",
+ "a", "couple", "crickets", "eating", "pie"};
+ // Create some keys that consist of words in random order.
+ std::random_device r;
+ std::seed_seq seed({r(), r(), r(), r(), r(), r(), r(), r()});
+ std::mt19937 rng(seed);
+ std::vector<std::string> keys(table_size);
+ std::vector<int> all_indices;
+ const int kBlockSize = 1 << 12;
+ std::unordered_set<std::string> t(kBlockSize);
+ std::uniform_int_distribution<int> uniform(0, ABSL_ARRAYSIZE(words) - 1);
+ for (int i = 0; i < table_size; i++) {
+ all_indices.push_back(i);
+ do {
+ keys[i].clear();
+ for (int j = 0; j < WordsPerKey; j++) {
+ absl::StrAppend(&keys[i], j > 0 ? " " : "", words[uniform(rng)]);
+ }
+ } while (!t.insert(keys[i]).second);
+ }
+
+ // Create a list of strings to lookup: a permutation of the array of
+ // keys we just created, with repeats. "Hot" keys get repeated more.
+ std::shuffle(all_indices.begin(), all_indices.end(), rng);
+ const int num_hot = table_size * kFractionOfKeysThatAreHot;
+ const int num_cold = table_size - num_hot;
+ std::vector<int> hot_indices(all_indices.begin(),
+ all_indices.begin() + num_hot);
+ std::vector<int> indices;
+ for (int i = 0; i < kNumLookupsOfColdKeys; i++) {
+ indices.insert(indices.end(), all_indices.begin(), all_indices.end());
+ }
+ for (int i = 0; i < kNumLookupsOfHotKeys - kNumLookupsOfColdKeys; i++) {
+ indices.insert(indices.end(), hot_indices.begin(), hot_indices.end());
+ }
+ std::shuffle(indices.begin(), indices.end(), rng);
+ ABSL_RAW_CHECK(
+ num_cold * kNumLookupsOfColdKeys + num_hot * kNumLookupsOfHotKeys ==
+ indices.size(),
+ "");
+ // After constructing the array we probe it with absl::string_views built from
+ // test_strings. This means operator== won't see equal pointers, so
+ // it'll have to check for equal lengths and equal characters.
+ std::vector<std::string> test_strings(indices.size());
+ for (int i = 0; i < indices.size(); i++) {
+ test_strings[i] = keys[indices[i]];
+ }
+
+ // Run the benchmark. It includes map construction but is mostly
+ // map lookups.
+ for (auto _ : state) {
+ Map h(table_size);
+ for (int i = 0; i < table_size; i++) {
+ h[keys[i]] = i * 2;
+ }
+ ABSL_RAW_CHECK(h.size() == table_size, "");
+ uint64_t sum = 0;
+ for (int i = 0; i < indices.size(); i++) {
+ sum += h[test_strings[i]];
+ }
+ benchmark::DoNotOptimize(sum);
+ }
+}
+
+void BM_StdMap_4(benchmark::State& state) {
+ StringViewMapBenchmark<EasyMap, 4>(state);
+}
+BENCHMARK(BM_StdMap_4)->Range(1 << 10, 1 << 16);
+
+void BM_StdMap_8(benchmark::State& state) {
+ StringViewMapBenchmark<EasyMap, 8>(state);
+}
+BENCHMARK(BM_StdMap_8)->Range(1 << 10, 1 << 16);
+
+void BM_CopyToStringNative(benchmark::State& state) {
+ std::string src(state.range(0), 'x');
+ absl::string_view sv(src);
+ std::string dst;
+ for (auto _ : state) {
+ dst.assign(sv.begin(), sv.end());
+ }
+}
+BENCHMARK(BM_CopyToStringNative)->Range(1 << 3, 1 << 12);
+
+void BM_AppendToStringNative(benchmark::State& state) {
+ std::string src(state.range(0), 'x');
+ absl::string_view sv(src);
+ std::string dst;
+ for (auto _ : state) {
+ dst.clear();
+ dst.insert(dst.end(), sv.begin(), sv.end());
+ }
+}
+BENCHMARK(BM_AppendToStringNative)->Range(1 << 3, 1 << 12);
+
+} // namespace
diff --git a/third_party/abseil/src/absl/strings/string_view_test.cc b/third_party/abseil/src/absl/strings/string_view_test.cc
new file mode 100644
index 0000000..dcebb15
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/string_view_test.cc
@@ -0,0 +1,1264 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/strings/string_view.h"
+
+#include <stdlib.h>
+#include <iomanip>
+#include <iterator>
+#include <limits>
+#include <map>
+#include <sstream>
+#include <stdexcept>
+#include <string>
+#include <type_traits>
+#include <utility>
+
+#include "gtest/gtest.h"
+#include "absl/base/config.h"
+#include "absl/base/dynamic_annotations.h"
+#include "absl/base/options.h"
+
+#if defined(ABSL_HAVE_STD_STRING_VIEW) || defined(__ANDROID__)
+// We don't control the death messaging when using std::string_view.
+// Android assert messages only go to system log, so death tests cannot inspect
+// the message for matching.
+#define ABSL_EXPECT_DEATH_IF_SUPPORTED(statement, regex) \
+ EXPECT_DEATH_IF_SUPPORTED(statement, ".*")
+#else
+#define ABSL_EXPECT_DEATH_IF_SUPPORTED(statement, regex) \
+ EXPECT_DEATH_IF_SUPPORTED(statement, regex)
+#endif
+
+namespace {
+
+// A minimal allocator that uses malloc().
+template <typename T>
+struct Mallocator {
+ typedef T value_type;
+ typedef size_t size_type;
+ typedef ptrdiff_t difference_type;
+ typedef T* pointer;
+ typedef const T* const_pointer;
+ typedef T& reference;
+ typedef const T& const_reference;
+
+ size_type max_size() const {
+ return size_t(std::numeric_limits<size_type>::max()) / sizeof(value_type);
+ }
+ template <typename U>
+ struct rebind {
+ typedef Mallocator<U> other;
+ };
+ Mallocator() = default;
+ template <class U>
+ Mallocator(const Mallocator<U>&) {} // NOLINT(runtime/explicit)
+
+ T* allocate(size_t n) { return static_cast<T*>(std::malloc(n * sizeof(T))); }
+ void deallocate(T* p, size_t) { std::free(p); }
+};
+template <typename T, typename U>
+bool operator==(const Mallocator<T>&, const Mallocator<U>&) {
+ return true;
+}
+template <typename T, typename U>
+bool operator!=(const Mallocator<T>&, const Mallocator<U>&) {
+ return false;
+}
+
+TEST(StringViewTest, Ctor) {
+ {
+ // Null.
+ absl::string_view s10;
+ EXPECT_TRUE(s10.data() == nullptr);
+ EXPECT_EQ(0, s10.length());
+ }
+
+ {
+ // const char* without length.
+ const char* hello = "hello";
+ absl::string_view s20(hello);
+ EXPECT_TRUE(s20.data() == hello);
+ EXPECT_EQ(5, s20.length());
+
+ // const char* with length.
+ absl::string_view s21(hello, 4);
+ EXPECT_TRUE(s21.data() == hello);
+ EXPECT_EQ(4, s21.length());
+
+ // Not recommended, but valid C++
+ absl::string_view s22(hello, 6);
+ EXPECT_TRUE(s22.data() == hello);
+ EXPECT_EQ(6, s22.length());
+ }
+
+ {
+ // std::string.
+ std::string hola = "hola";
+ absl::string_view s30(hola);
+ EXPECT_TRUE(s30.data() == hola.data());
+ EXPECT_EQ(4, s30.length());
+
+ // std::string with embedded '\0'.
+ hola.push_back('\0');
+ hola.append("h2");
+ hola.push_back('\0');
+ absl::string_view s31(hola);
+ EXPECT_TRUE(s31.data() == hola.data());
+ EXPECT_EQ(8, s31.length());
+ }
+
+ {
+ using mstring =
+ std::basic_string<char, std::char_traits<char>, Mallocator<char>>;
+ mstring str1("BUNGIE-JUMPING!");
+ const mstring str2("SLEEPING!");
+
+ absl::string_view s1(str1);
+ s1.remove_prefix(strlen("BUNGIE-JUM"));
+
+ absl::string_view s2(str2);
+ s2.remove_prefix(strlen("SLEE"));
+
+ EXPECT_EQ(s1, s2);
+ EXPECT_EQ(s1, "PING!");
+ }
+
+ // TODO(mec): absl::string_view(const absl::string_view&);
+}
+
+TEST(StringViewTest, Swap) {
+ absl::string_view a("a");
+ absl::string_view b("bbb");
+ EXPECT_TRUE(noexcept(a.swap(b)));
+ a.swap(b);
+ EXPECT_EQ(a, "bbb");
+ EXPECT_EQ(b, "a");
+ a.swap(b);
+ EXPECT_EQ(a, "a");
+ EXPECT_EQ(b, "bbb");
+}
+
+TEST(StringViewTest, STLComparator) {
+ std::string s1("foo");
+ std::string s2("bar");
+ std::string s3("baz");
+
+ absl::string_view p1(s1);
+ absl::string_view p2(s2);
+ absl::string_view p3(s3);
+
+ typedef std::map<absl::string_view, int> TestMap;
+ TestMap map;
+
+ map.insert(std::make_pair(p1, 0));
+ map.insert(std::make_pair(p2, 1));
+ map.insert(std::make_pair(p3, 2));
+ EXPECT_EQ(map.size(), 3);
+
+ TestMap::const_iterator iter = map.begin();
+ EXPECT_EQ(iter->second, 1);
+ ++iter;
+ EXPECT_EQ(iter->second, 2);
+ ++iter;
+ EXPECT_EQ(iter->second, 0);
+ ++iter;
+ EXPECT_TRUE(iter == map.end());
+
+ TestMap::iterator new_iter = map.find("zot");
+ EXPECT_TRUE(new_iter == map.end());
+
+ new_iter = map.find("bar");
+ EXPECT_TRUE(new_iter != map.end());
+
+ map.erase(new_iter);
+ EXPECT_EQ(map.size(), 2);
+
+ iter = map.begin();
+ EXPECT_EQ(iter->second, 2);
+ ++iter;
+ EXPECT_EQ(iter->second, 0);
+ ++iter;
+ EXPECT_TRUE(iter == map.end());
+}
+
+#define COMPARE(result, op, x, y) \
+ EXPECT_EQ(result, absl::string_view((x)) op absl::string_view((y))); \
+ EXPECT_EQ(result, absl::string_view((x)).compare(absl::string_view((y))) op 0)
+
+TEST(StringViewTest, ComparisonOperators) {
+ COMPARE(true, ==, "", "");
+ COMPARE(true, ==, "", absl::string_view());
+ COMPARE(true, ==, absl::string_view(), "");
+ COMPARE(true, ==, "a", "a");
+ COMPARE(true, ==, "aa", "aa");
+ COMPARE(false, ==, "a", "");
+ COMPARE(false, ==, "", "a");
+ COMPARE(false, ==, "a", "b");
+ COMPARE(false, ==, "a", "aa");
+ COMPARE(false, ==, "aa", "a");
+
+ COMPARE(false, !=, "", "");
+ COMPARE(false, !=, "a", "a");
+ COMPARE(false, !=, "aa", "aa");
+ COMPARE(true, !=, "a", "");
+ COMPARE(true, !=, "", "a");
+ COMPARE(true, !=, "a", "b");
+ COMPARE(true, !=, "a", "aa");
+ COMPARE(true, !=, "aa", "a");
+
+ COMPARE(true, <, "a", "b");
+ COMPARE(true, <, "a", "aa");
+ COMPARE(true, <, "aa", "b");
+ COMPARE(true, <, "aa", "bb");
+ COMPARE(false, <, "a", "a");
+ COMPARE(false, <, "b", "a");
+ COMPARE(false, <, "aa", "a");
+ COMPARE(false, <, "b", "aa");
+ COMPARE(false, <, "bb", "aa");
+
+ COMPARE(true, <=, "a", "a");
+ COMPARE(true, <=, "a", "b");
+ COMPARE(true, <=, "a", "aa");
+ COMPARE(true, <=, "aa", "b");
+ COMPARE(true, <=, "aa", "bb");
+ COMPARE(false, <=, "b", "a");
+ COMPARE(false, <=, "aa", "a");
+ COMPARE(false, <=, "b", "aa");
+ COMPARE(false, <=, "bb", "aa");
+
+ COMPARE(false, >=, "a", "b");
+ COMPARE(false, >=, "a", "aa");
+ COMPARE(false, >=, "aa", "b");
+ COMPARE(false, >=, "aa", "bb");
+ COMPARE(true, >=, "a", "a");
+ COMPARE(true, >=, "b", "a");
+ COMPARE(true, >=, "aa", "a");
+ COMPARE(true, >=, "b", "aa");
+ COMPARE(true, >=, "bb", "aa");
+
+ COMPARE(false, >, "a", "a");
+ COMPARE(false, >, "a", "b");
+ COMPARE(false, >, "a", "aa");
+ COMPARE(false, >, "aa", "b");
+ COMPARE(false, >, "aa", "bb");
+ COMPARE(true, >, "b", "a");
+ COMPARE(true, >, "aa", "a");
+ COMPARE(true, >, "b", "aa");
+ COMPARE(true, >, "bb", "aa");
+}
+
+TEST(StringViewTest, ComparisonOperatorsByCharacterPosition) {
+ std::string x;
+ for (int i = 0; i < 256; i++) {
+ x += 'a';
+ std::string y = x;
+ COMPARE(true, ==, x, y);
+ for (int j = 0; j < i; j++) {
+ std::string z = x;
+ z[j] = 'b'; // Differs in position 'j'
+ COMPARE(false, ==, x, z);
+ COMPARE(true, <, x, z);
+ COMPARE(true, >, z, x);
+ if (j + 1 < i) {
+ z[j + 1] = 'A'; // Differs in position 'j+1' as well
+ COMPARE(false, ==, x, z);
+ COMPARE(true, <, x, z);
+ COMPARE(true, >, z, x);
+ z[j + 1] = 'z'; // Differs in position 'j+1' as well
+ COMPARE(false, ==, x, z);
+ COMPARE(true, <, x, z);
+ COMPARE(true, >, z, x);
+ }
+ }
+ }
+}
+#undef COMPARE
+
+// Sadly, our users often confuse std::string::npos with
+// absl::string_view::npos; So much so that we test here that they are the same.
+// They need to both be unsigned, and both be the maximum-valued integer of
+// their type.
+
+template <typename T>
+struct is_type {
+ template <typename U>
+ static bool same(U) {
+ return false;
+ }
+ static bool same(T) { return true; }
+};
+
+TEST(StringViewTest, NposMatchesStdStringView) {
+ EXPECT_EQ(absl::string_view::npos, std::string::npos);
+
+ EXPECT_TRUE(is_type<size_t>::same(absl::string_view::npos));
+ EXPECT_FALSE(is_type<size_t>::same(""));
+
+ // Make sure absl::string_view::npos continues to be a header constant.
+ char test[absl::string_view::npos & 1] = {0};
+ EXPECT_EQ(0, test[0]);
+}
+
+TEST(StringViewTest, STL1) {
+ const absl::string_view a("abcdefghijklmnopqrstuvwxyz");
+ const absl::string_view b("abc");
+ const absl::string_view c("xyz");
+ const absl::string_view d("foobar");
+ const absl::string_view e;
+ std::string temp("123");
+ temp += '\0';
+ temp += "456";
+ const absl::string_view f(temp);
+
+ EXPECT_EQ(a[6], 'g');
+ EXPECT_EQ(b[0], 'a');
+ EXPECT_EQ(c[2], 'z');
+ EXPECT_EQ(f[3], '\0');
+ EXPECT_EQ(f[5], '5');
+
+ EXPECT_EQ(*d.data(), 'f');
+ EXPECT_EQ(d.data()[5], 'r');
+ EXPECT_TRUE(e.data() == nullptr);
+
+ EXPECT_EQ(*a.begin(), 'a');
+ EXPECT_EQ(*(b.begin() + 2), 'c');
+ EXPECT_EQ(*(c.end() - 1), 'z');
+
+ EXPECT_EQ(*a.rbegin(), 'z');
+ EXPECT_EQ(*(b.rbegin() + 2), 'a');
+ EXPECT_EQ(*(c.rend() - 1), 'x');
+ EXPECT_TRUE(a.rbegin() + 26 == a.rend());
+
+ EXPECT_EQ(a.size(), 26);
+ EXPECT_EQ(b.size(), 3);
+ EXPECT_EQ(c.size(), 3);
+ EXPECT_EQ(d.size(), 6);
+ EXPECT_EQ(e.size(), 0);
+ EXPECT_EQ(f.size(), 7);
+
+ EXPECT_TRUE(!d.empty());
+ EXPECT_TRUE(d.begin() != d.end());
+ EXPECT_TRUE(d.begin() + 6 == d.end());
+
+ EXPECT_TRUE(e.empty());
+ EXPECT_TRUE(e.begin() == e.end());
+
+ char buf[4] = { '%', '%', '%', '%' };
+ EXPECT_EQ(a.copy(buf, 4), 4);
+ EXPECT_EQ(buf[0], a[0]);
+ EXPECT_EQ(buf[1], a[1]);
+ EXPECT_EQ(buf[2], a[2]);
+ EXPECT_EQ(buf[3], a[3]);
+ EXPECT_EQ(a.copy(buf, 3, 7), 3);
+ EXPECT_EQ(buf[0], a[7]);
+ EXPECT_EQ(buf[1], a[8]);
+ EXPECT_EQ(buf[2], a[9]);
+ EXPECT_EQ(buf[3], a[3]);
+ EXPECT_EQ(c.copy(buf, 99), 3);
+ EXPECT_EQ(buf[0], c[0]);
+ EXPECT_EQ(buf[1], c[1]);
+ EXPECT_EQ(buf[2], c[2]);
+ EXPECT_EQ(buf[3], a[3]);
+#ifdef ABSL_HAVE_EXCEPTIONS
+ EXPECT_THROW(a.copy(buf, 1, 27), std::out_of_range);
+#else
+ ABSL_EXPECT_DEATH_IF_SUPPORTED(a.copy(buf, 1, 27), "absl::string_view::copy");
+#endif
+}
+
+// Separated from STL1() because some compilers produce an overly
+// large stack frame for the combined function.
+TEST(StringViewTest, STL2) {
+ const absl::string_view a("abcdefghijklmnopqrstuvwxyz");
+ const absl::string_view b("abc");
+ const absl::string_view c("xyz");
+ absl::string_view d("foobar");
+ const absl::string_view e;
+ const absl::string_view f(
+ "123"
+ "\0"
+ "456",
+ 7);
+
+ d = absl::string_view();
+ EXPECT_EQ(d.size(), 0);
+ EXPECT_TRUE(d.empty());
+ EXPECT_TRUE(d.data() == nullptr);
+ EXPECT_TRUE(d.begin() == d.end());
+
+ EXPECT_EQ(a.find(b), 0);
+ EXPECT_EQ(a.find(b, 1), absl::string_view::npos);
+ EXPECT_EQ(a.find(c), 23);
+ EXPECT_EQ(a.find(c, 9), 23);
+ EXPECT_EQ(a.find(c, absl::string_view::npos), absl::string_view::npos);
+ EXPECT_EQ(b.find(c), absl::string_view::npos);
+ EXPECT_EQ(b.find(c, absl::string_view::npos), absl::string_view::npos);
+ EXPECT_EQ(a.find(d), 0);
+ EXPECT_EQ(a.find(e), 0);
+ EXPECT_EQ(a.find(d, 12), 12);
+ EXPECT_EQ(a.find(e, 17), 17);
+ absl::string_view g("xx not found bb");
+ EXPECT_EQ(a.find(g), absl::string_view::npos);
+ // empty string nonsense
+ EXPECT_EQ(d.find(b), absl::string_view::npos);
+ EXPECT_EQ(e.find(b), absl::string_view::npos);
+ EXPECT_EQ(d.find(b, 4), absl::string_view::npos);
+ EXPECT_EQ(e.find(b, 7), absl::string_view::npos);
+
+ size_t empty_search_pos = std::string().find(std::string());
+ EXPECT_EQ(d.find(d), empty_search_pos);
+ EXPECT_EQ(d.find(e), empty_search_pos);
+ EXPECT_EQ(e.find(d), empty_search_pos);
+ EXPECT_EQ(e.find(e), empty_search_pos);
+ EXPECT_EQ(d.find(d, 4), std::string().find(std::string(), 4));
+ EXPECT_EQ(d.find(e, 4), std::string().find(std::string(), 4));
+ EXPECT_EQ(e.find(d, 4), std::string().find(std::string(), 4));
+ EXPECT_EQ(e.find(e, 4), std::string().find(std::string(), 4));
+
+ EXPECT_EQ(a.find('a'), 0);
+ EXPECT_EQ(a.find('c'), 2);
+ EXPECT_EQ(a.find('z'), 25);
+ EXPECT_EQ(a.find('$'), absl::string_view::npos);
+ EXPECT_EQ(a.find('\0'), absl::string_view::npos);
+ EXPECT_EQ(f.find('\0'), 3);
+ EXPECT_EQ(f.find('3'), 2);
+ EXPECT_EQ(f.find('5'), 5);
+ EXPECT_EQ(g.find('o'), 4);
+ EXPECT_EQ(g.find('o', 4), 4);
+ EXPECT_EQ(g.find('o', 5), 8);
+ EXPECT_EQ(a.find('b', 5), absl::string_view::npos);
+ // empty string nonsense
+ EXPECT_EQ(d.find('\0'), absl::string_view::npos);
+ EXPECT_EQ(e.find('\0'), absl::string_view::npos);
+ EXPECT_EQ(d.find('\0', 4), absl::string_view::npos);
+ EXPECT_EQ(e.find('\0', 7), absl::string_view::npos);
+ EXPECT_EQ(d.find('x'), absl::string_view::npos);
+ EXPECT_EQ(e.find('x'), absl::string_view::npos);
+ EXPECT_EQ(d.find('x', 4), absl::string_view::npos);
+ EXPECT_EQ(e.find('x', 7), absl::string_view::npos);
+
+ EXPECT_EQ(a.rfind(b), 0);
+ EXPECT_EQ(a.rfind(b, 1), 0);
+ EXPECT_EQ(a.rfind(c), 23);
+ EXPECT_EQ(a.rfind(c, 22), absl::string_view::npos);
+ EXPECT_EQ(a.rfind(c, 1), absl::string_view::npos);
+ EXPECT_EQ(a.rfind(c, 0), absl::string_view::npos);
+ EXPECT_EQ(b.rfind(c), absl::string_view::npos);
+ EXPECT_EQ(b.rfind(c, 0), absl::string_view::npos);
+ EXPECT_EQ(a.rfind(d), std::string(a).rfind(std::string()));
+ EXPECT_EQ(a.rfind(e), std::string(a).rfind(std::string()));
+ EXPECT_EQ(a.rfind(d, 12), 12);
+ EXPECT_EQ(a.rfind(e, 17), 17);
+ EXPECT_EQ(a.rfind(g), absl::string_view::npos);
+ EXPECT_EQ(d.rfind(b), absl::string_view::npos);
+ EXPECT_EQ(e.rfind(b), absl::string_view::npos);
+ EXPECT_EQ(d.rfind(b, 4), absl::string_view::npos);
+ EXPECT_EQ(e.rfind(b, 7), absl::string_view::npos);
+ // empty string nonsense
+ EXPECT_EQ(d.rfind(d, 4), std::string().rfind(std::string()));
+ EXPECT_EQ(e.rfind(d, 7), std::string().rfind(std::string()));
+ EXPECT_EQ(d.rfind(e, 4), std::string().rfind(std::string()));
+ EXPECT_EQ(e.rfind(e, 7), std::string().rfind(std::string()));
+ EXPECT_EQ(d.rfind(d), std::string().rfind(std::string()));
+ EXPECT_EQ(e.rfind(d), std::string().rfind(std::string()));
+ EXPECT_EQ(d.rfind(e), std::string().rfind(std::string()));
+ EXPECT_EQ(e.rfind(e), std::string().rfind(std::string()));
+
+ EXPECT_EQ(g.rfind('o'), 8);
+ EXPECT_EQ(g.rfind('q'), absl::string_view::npos);
+ EXPECT_EQ(g.rfind('o', 8), 8);
+ EXPECT_EQ(g.rfind('o', 7), 4);
+ EXPECT_EQ(g.rfind('o', 3), absl::string_view::npos);
+ EXPECT_EQ(f.rfind('\0'), 3);
+ EXPECT_EQ(f.rfind('\0', 12), 3);
+ EXPECT_EQ(f.rfind('3'), 2);
+ EXPECT_EQ(f.rfind('5'), 5);
+ // empty string nonsense
+ EXPECT_EQ(d.rfind('o'), absl::string_view::npos);
+ EXPECT_EQ(e.rfind('o'), absl::string_view::npos);
+ EXPECT_EQ(d.rfind('o', 4), absl::string_view::npos);
+ EXPECT_EQ(e.rfind('o', 7), absl::string_view::npos);
+}
+
+// Continued from STL2
+TEST(StringViewTest, STL2FindFirst) {
+ const absl::string_view a("abcdefghijklmnopqrstuvwxyz");
+ const absl::string_view b("abc");
+ const absl::string_view c("xyz");
+ absl::string_view d("foobar");
+ const absl::string_view e;
+ const absl::string_view f(
+ "123"
+ "\0"
+ "456",
+ 7);
+ absl::string_view g("xx not found bb");
+
+ d = absl::string_view();
+ EXPECT_EQ(a.find_first_of(b), 0);
+ EXPECT_EQ(a.find_first_of(b, 0), 0);
+ EXPECT_EQ(a.find_first_of(b, 1), 1);
+ EXPECT_EQ(a.find_first_of(b, 2), 2);
+ EXPECT_EQ(a.find_first_of(b, 3), absl::string_view::npos);
+ EXPECT_EQ(a.find_first_of(c), 23);
+ EXPECT_EQ(a.find_first_of(c, 23), 23);
+ EXPECT_EQ(a.find_first_of(c, 24), 24);
+ EXPECT_EQ(a.find_first_of(c, 25), 25);
+ EXPECT_EQ(a.find_first_of(c, 26), absl::string_view::npos);
+ EXPECT_EQ(g.find_first_of(b), 13);
+ EXPECT_EQ(g.find_first_of(c), 0);
+ EXPECT_EQ(a.find_first_of(f), absl::string_view::npos);
+ EXPECT_EQ(f.find_first_of(a), absl::string_view::npos);
+ // empty string nonsense
+ EXPECT_EQ(a.find_first_of(d), absl::string_view::npos);
+ EXPECT_EQ(a.find_first_of(e), absl::string_view::npos);
+ EXPECT_EQ(d.find_first_of(b), absl::string_view::npos);
+ EXPECT_EQ(e.find_first_of(b), absl::string_view::npos);
+ EXPECT_EQ(d.find_first_of(d), absl::string_view::npos);
+ EXPECT_EQ(e.find_first_of(d), absl::string_view::npos);
+ EXPECT_EQ(d.find_first_of(e), absl::string_view::npos);
+ EXPECT_EQ(e.find_first_of(e), absl::string_view::npos);
+
+ EXPECT_EQ(a.find_first_not_of(b), 3);
+ EXPECT_EQ(a.find_first_not_of(c), 0);
+ EXPECT_EQ(b.find_first_not_of(a), absl::string_view::npos);
+ EXPECT_EQ(c.find_first_not_of(a), absl::string_view::npos);
+ EXPECT_EQ(f.find_first_not_of(a), 0);
+ EXPECT_EQ(a.find_first_not_of(f), 0);
+ EXPECT_EQ(a.find_first_not_of(d), 0);
+ EXPECT_EQ(a.find_first_not_of(e), 0);
+ // empty string nonsense
+ EXPECT_EQ(a.find_first_not_of(d), 0);
+ EXPECT_EQ(a.find_first_not_of(e), 0);
+ EXPECT_EQ(a.find_first_not_of(d, 1), 1);
+ EXPECT_EQ(a.find_first_not_of(e, 1), 1);
+ EXPECT_EQ(a.find_first_not_of(d, a.size() - 1), a.size() - 1);
+ EXPECT_EQ(a.find_first_not_of(e, a.size() - 1), a.size() - 1);
+ EXPECT_EQ(a.find_first_not_of(d, a.size()), absl::string_view::npos);
+ EXPECT_EQ(a.find_first_not_of(e, a.size()), absl::string_view::npos);
+ EXPECT_EQ(a.find_first_not_of(d, absl::string_view::npos),
+ absl::string_view::npos);
+ EXPECT_EQ(a.find_first_not_of(e, absl::string_view::npos),
+ absl::string_view::npos);
+ EXPECT_EQ(d.find_first_not_of(a), absl::string_view::npos);
+ EXPECT_EQ(e.find_first_not_of(a), absl::string_view::npos);
+ EXPECT_EQ(d.find_first_not_of(d), absl::string_view::npos);
+ EXPECT_EQ(e.find_first_not_of(d), absl::string_view::npos);
+ EXPECT_EQ(d.find_first_not_of(e), absl::string_view::npos);
+ EXPECT_EQ(e.find_first_not_of(e), absl::string_view::npos);
+
+ absl::string_view h("====");
+ EXPECT_EQ(h.find_first_not_of('='), absl::string_view::npos);
+ EXPECT_EQ(h.find_first_not_of('=', 3), absl::string_view::npos);
+ EXPECT_EQ(h.find_first_not_of('\0'), 0);
+ EXPECT_EQ(g.find_first_not_of('x'), 2);
+ EXPECT_EQ(f.find_first_not_of('\0'), 0);
+ EXPECT_EQ(f.find_first_not_of('\0', 3), 4);
+ EXPECT_EQ(f.find_first_not_of('\0', 2), 2);
+ // empty string nonsense
+ EXPECT_EQ(d.find_first_not_of('x'), absl::string_view::npos);
+ EXPECT_EQ(e.find_first_not_of('x'), absl::string_view::npos);
+ EXPECT_EQ(d.find_first_not_of('\0'), absl::string_view::npos);
+ EXPECT_EQ(e.find_first_not_of('\0'), absl::string_view::npos);
+}
+
+// Continued from STL2
+TEST(StringViewTest, STL2FindLast) {
+ const absl::string_view a("abcdefghijklmnopqrstuvwxyz");
+ const absl::string_view b("abc");
+ const absl::string_view c("xyz");
+ absl::string_view d("foobar");
+ const absl::string_view e;
+ const absl::string_view f(
+ "123"
+ "\0"
+ "456",
+ 7);
+ absl::string_view g("xx not found bb");
+ absl::string_view h("====");
+ absl::string_view i("56");
+
+ d = absl::string_view();
+ EXPECT_EQ(h.find_last_of(a), absl::string_view::npos);
+ EXPECT_EQ(g.find_last_of(a), g.size()-1);
+ EXPECT_EQ(a.find_last_of(b), 2);
+ EXPECT_EQ(a.find_last_of(c), a.size()-1);
+ EXPECT_EQ(f.find_last_of(i), 6);
+ EXPECT_EQ(a.find_last_of('a'), 0);
+ EXPECT_EQ(a.find_last_of('b'), 1);
+ EXPECT_EQ(a.find_last_of('z'), 25);
+ EXPECT_EQ(a.find_last_of('a', 5), 0);
+ EXPECT_EQ(a.find_last_of('b', 5), 1);
+ EXPECT_EQ(a.find_last_of('b', 0), absl::string_view::npos);
+ EXPECT_EQ(a.find_last_of('z', 25), 25);
+ EXPECT_EQ(a.find_last_of('z', 24), absl::string_view::npos);
+ EXPECT_EQ(f.find_last_of(i, 5), 5);
+ EXPECT_EQ(f.find_last_of(i, 6), 6);
+ EXPECT_EQ(f.find_last_of(a, 4), absl::string_view::npos);
+ // empty string nonsense
+ EXPECT_EQ(f.find_last_of(d), absl::string_view::npos);
+ EXPECT_EQ(f.find_last_of(e), absl::string_view::npos);
+ EXPECT_EQ(f.find_last_of(d, 4), absl::string_view::npos);
+ EXPECT_EQ(f.find_last_of(e, 4), absl::string_view::npos);
+ EXPECT_EQ(d.find_last_of(d), absl::string_view::npos);
+ EXPECT_EQ(d.find_last_of(e), absl::string_view::npos);
+ EXPECT_EQ(e.find_last_of(d), absl::string_view::npos);
+ EXPECT_EQ(e.find_last_of(e), absl::string_view::npos);
+ EXPECT_EQ(d.find_last_of(f), absl::string_view::npos);
+ EXPECT_EQ(e.find_last_of(f), absl::string_view::npos);
+ EXPECT_EQ(d.find_last_of(d, 4), absl::string_view::npos);
+ EXPECT_EQ(d.find_last_of(e, 4), absl::string_view::npos);
+ EXPECT_EQ(e.find_last_of(d, 4), absl::string_view::npos);
+ EXPECT_EQ(e.find_last_of(e, 4), absl::string_view::npos);
+ EXPECT_EQ(d.find_last_of(f, 4), absl::string_view::npos);
+ EXPECT_EQ(e.find_last_of(f, 4), absl::string_view::npos);
+
+ EXPECT_EQ(a.find_last_not_of(b), a.size()-1);
+ EXPECT_EQ(a.find_last_not_of(c), 22);
+ EXPECT_EQ(b.find_last_not_of(a), absl::string_view::npos);
+ EXPECT_EQ(b.find_last_not_of(b), absl::string_view::npos);
+ EXPECT_EQ(f.find_last_not_of(i), 4);
+ EXPECT_EQ(a.find_last_not_of(c, 24), 22);
+ EXPECT_EQ(a.find_last_not_of(b, 3), 3);
+ EXPECT_EQ(a.find_last_not_of(b, 2), absl::string_view::npos);
+ // empty string nonsense
+ EXPECT_EQ(f.find_last_not_of(d), f.size()-1);
+ EXPECT_EQ(f.find_last_not_of(e), f.size()-1);
+ EXPECT_EQ(f.find_last_not_of(d, 4), 4);
+ EXPECT_EQ(f.find_last_not_of(e, 4), 4);
+ EXPECT_EQ(d.find_last_not_of(d), absl::string_view::npos);
+ EXPECT_EQ(d.find_last_not_of(e), absl::string_view::npos);
+ EXPECT_EQ(e.find_last_not_of(d), absl::string_view::npos);
+ EXPECT_EQ(e.find_last_not_of(e), absl::string_view::npos);
+ EXPECT_EQ(d.find_last_not_of(f), absl::string_view::npos);
+ EXPECT_EQ(e.find_last_not_of(f), absl::string_view::npos);
+ EXPECT_EQ(d.find_last_not_of(d, 4), absl::string_view::npos);
+ EXPECT_EQ(d.find_last_not_of(e, 4), absl::string_view::npos);
+ EXPECT_EQ(e.find_last_not_of(d, 4), absl::string_view::npos);
+ EXPECT_EQ(e.find_last_not_of(e, 4), absl::string_view::npos);
+ EXPECT_EQ(d.find_last_not_of(f, 4), absl::string_view::npos);
+ EXPECT_EQ(e.find_last_not_of(f, 4), absl::string_view::npos);
+
+ EXPECT_EQ(h.find_last_not_of('x'), h.size() - 1);
+ EXPECT_EQ(h.find_last_not_of('='), absl::string_view::npos);
+ EXPECT_EQ(b.find_last_not_of('c'), 1);
+ EXPECT_EQ(h.find_last_not_of('x', 2), 2);
+ EXPECT_EQ(h.find_last_not_of('=', 2), absl::string_view::npos);
+ EXPECT_EQ(b.find_last_not_of('b', 1), 0);
+ // empty string nonsense
+ EXPECT_EQ(d.find_last_not_of('x'), absl::string_view::npos);
+ EXPECT_EQ(e.find_last_not_of('x'), absl::string_view::npos);
+ EXPECT_EQ(d.find_last_not_of('\0'), absl::string_view::npos);
+ EXPECT_EQ(e.find_last_not_of('\0'), absl::string_view::npos);
+}
+
+// Continued from STL2
+TEST(StringViewTest, STL2Substr) {
+ const absl::string_view a("abcdefghijklmnopqrstuvwxyz");
+ const absl::string_view b("abc");
+ const absl::string_view c("xyz");
+ absl::string_view d("foobar");
+ const absl::string_view e;
+
+ d = absl::string_view();
+ EXPECT_EQ(a.substr(0, 3), b);
+ EXPECT_EQ(a.substr(23), c);
+ EXPECT_EQ(a.substr(23, 3), c);
+ EXPECT_EQ(a.substr(23, 99), c);
+ EXPECT_EQ(a.substr(0), a);
+ EXPECT_EQ(a.substr(3, 2), "de");
+ // empty string nonsense
+ EXPECT_EQ(d.substr(0, 99), e);
+ // use of npos
+ EXPECT_EQ(a.substr(0, absl::string_view::npos), a);
+ EXPECT_EQ(a.substr(23, absl::string_view::npos), c);
+ // throw exception
+#ifdef ABSL_HAVE_EXCEPTIONS
+ EXPECT_THROW((void)a.substr(99, 2), std::out_of_range);
+#else
+ ABSL_EXPECT_DEATH_IF_SUPPORTED((void)a.substr(99, 2),
+ "absl::string_view::substr");
+#endif
+}
+
+TEST(StringViewTest, TruncSubstr) {
+ const absl::string_view hi("hi");
+ EXPECT_EQ("", absl::ClippedSubstr(hi, 0, 0));
+ EXPECT_EQ("h", absl::ClippedSubstr(hi, 0, 1));
+ EXPECT_EQ("hi", absl::ClippedSubstr(hi, 0));
+ EXPECT_EQ("i", absl::ClippedSubstr(hi, 1));
+ EXPECT_EQ("", absl::ClippedSubstr(hi, 2));
+ EXPECT_EQ("", absl::ClippedSubstr(hi, 3)); // truncation
+ EXPECT_EQ("", absl::ClippedSubstr(hi, 3, 2)); // truncation
+}
+
+TEST(StringViewTest, UTF8) {
+ std::string utf8 = "\u00E1";
+ std::string utf8_twice = utf8 + " " + utf8;
+ int utf8_len = strlen(utf8.data());
+ EXPECT_EQ(utf8_len, absl::string_view(utf8_twice).find_first_of(" "));
+ EXPECT_EQ(utf8_len, absl::string_view(utf8_twice).find_first_of(" \t"));
+}
+
+TEST(StringViewTest, FindConformance) {
+ struct {
+ std::string haystack;
+ std::string needle;
+ } specs[] = {
+ {"", ""},
+ {"", "a"},
+ {"a", ""},
+ {"a", "a"},
+ {"a", "b"},
+ {"aa", ""},
+ {"aa", "a"},
+ {"aa", "b"},
+ {"ab", "a"},
+ {"ab", "b"},
+ {"abcd", ""},
+ {"abcd", "a"},
+ {"abcd", "d"},
+ {"abcd", "ab"},
+ {"abcd", "bc"},
+ {"abcd", "cd"},
+ {"abcd", "abcd"},
+ };
+ for (const auto& s : specs) {
+ SCOPED_TRACE(s.haystack);
+ SCOPED_TRACE(s.needle);
+ std::string st = s.haystack;
+ absl::string_view sp = s.haystack;
+ for (size_t i = 0; i <= sp.size(); ++i) {
+ size_t pos = (i == sp.size()) ? absl::string_view::npos : i;
+ SCOPED_TRACE(pos);
+ EXPECT_EQ(sp.find(s.needle, pos),
+ st.find(s.needle, pos));
+ EXPECT_EQ(sp.rfind(s.needle, pos),
+ st.rfind(s.needle, pos));
+ EXPECT_EQ(sp.find_first_of(s.needle, pos),
+ st.find_first_of(s.needle, pos));
+ EXPECT_EQ(sp.find_first_not_of(s.needle, pos),
+ st.find_first_not_of(s.needle, pos));
+ EXPECT_EQ(sp.find_last_of(s.needle, pos),
+ st.find_last_of(s.needle, pos));
+ EXPECT_EQ(sp.find_last_not_of(s.needle, pos),
+ st.find_last_not_of(s.needle, pos));
+ }
+ }
+}
+
+TEST(StringViewTest, Remove) {
+ absl::string_view a("foobar");
+ std::string s1("123");
+ s1 += '\0';
+ s1 += "456";
+ absl::string_view e;
+ std::string s2;
+
+ // remove_prefix
+ absl::string_view c(a);
+ c.remove_prefix(3);
+ EXPECT_EQ(c, "bar");
+ c = a;
+ c.remove_prefix(0);
+ EXPECT_EQ(c, a);
+ c.remove_prefix(c.size());
+ EXPECT_EQ(c, e);
+
+ // remove_suffix
+ c = a;
+ c.remove_suffix(3);
+ EXPECT_EQ(c, "foo");
+ c = a;
+ c.remove_suffix(0);
+ EXPECT_EQ(c, a);
+ c.remove_suffix(c.size());
+ EXPECT_EQ(c, e);
+}
+
+TEST(StringViewTest, Set) {
+ absl::string_view a("foobar");
+ absl::string_view empty;
+ absl::string_view b;
+
+ // set
+ b = absl::string_view("foobar", 6);
+ EXPECT_EQ(b, a);
+ b = absl::string_view("foobar", 0);
+ EXPECT_EQ(b, empty);
+ b = absl::string_view("foobar", 7);
+ EXPECT_NE(b, a);
+
+ b = absl::string_view("foobar");
+ EXPECT_EQ(b, a);
+}
+
+TEST(StringViewTest, FrontBack) {
+ static const char arr[] = "abcd";
+ const absl::string_view csp(arr, 4);
+ EXPECT_EQ(&arr[0], &csp.front());
+ EXPECT_EQ(&arr[3], &csp.back());
+}
+
+TEST(StringViewTest, FrontBackSingleChar) {
+ static const char c = 'a';
+ const absl::string_view csp(&c, 1);
+ EXPECT_EQ(&c, &csp.front());
+ EXPECT_EQ(&c, &csp.back());
+}
+
+TEST(StringViewTest, FrontBackEmpty) {
+#ifndef ABSL_USES_STD_STRING_VIEW
+#if !defined(NDEBUG) || ABSL_OPTION_HARDENED
+ // Abseil's string_view implementation has debug assertions that check that
+ // front() and back() are not called on an empty string_view.
+ absl::string_view sv;
+ ABSL_EXPECT_DEATH_IF_SUPPORTED(sv.front(), "");
+ ABSL_EXPECT_DEATH_IF_SUPPORTED(sv.back(), "");
+#endif
+#endif
+}
+
+// `std::string_view::string_view(const char*)` calls
+// `std::char_traits<char>::length(const char*)` to get the string length. In
+// libc++, it doesn't allow `nullptr` in the constexpr context, with the error
+// "read of dereferenced null pointer is not allowed in a constant expression".
+// At run time, the behavior of `std::char_traits::length()` on `nullptr` is
+// undefined by the standard and usually results in crash with libc++.
+// GCC also started rejected this in libstdc++ starting in GCC9.
+// In MSVC, creating a constexpr string_view from nullptr also triggers an
+// "unevaluable pointer value" error. This compiler implementation conforms
+// to the standard, but `absl::string_view` implements a different
+// behavior for historical reasons. We work around tests that construct
+// `string_view` from `nullptr` when using libc++.
+#if !defined(ABSL_USES_STD_STRING_VIEW) || \
+ (!(defined(_GLIBCXX_RELEASE) && _GLIBCXX_RELEASE >= 9) && \
+ !defined(_LIBCPP_VERSION) && !defined(_MSC_VER))
+#define ABSL_HAVE_STRING_VIEW_FROM_NULLPTR 1
+#endif
+
+TEST(StringViewTest, NULLInput) {
+ absl::string_view s;
+ EXPECT_EQ(s.data(), nullptr);
+ EXPECT_EQ(s.size(), 0);
+
+#ifdef ABSL_HAVE_STRING_VIEW_FROM_NULLPTR
+ s = absl::string_view(nullptr);
+ EXPECT_EQ(s.data(), nullptr);
+ EXPECT_EQ(s.size(), 0);
+
+ // .ToString() on a absl::string_view with nullptr should produce the empty
+ // string.
+ EXPECT_EQ("", std::string(s));
+#endif // ABSL_HAVE_STRING_VIEW_FROM_NULLPTR
+}
+
+TEST(StringViewTest, Comparisons2) {
+ // The `compare` member has 6 overloads (v: string_view, s: const char*):
+ // (1) compare(v)
+ // (2) compare(pos1, count1, v)
+ // (3) compare(pos1, count1, v, pos2, count2)
+ // (4) compare(s)
+ // (5) compare(pos1, count1, s)
+ // (6) compare(pos1, count1, s, count2)
+
+ absl::string_view abc("abcdefghijklmnopqrstuvwxyz");
+
+ // check comparison operations on strings longer than 4 bytes.
+ EXPECT_EQ(abc, absl::string_view("abcdefghijklmnopqrstuvwxyz"));
+ EXPECT_EQ(abc.compare(absl::string_view("abcdefghijklmnopqrstuvwxyz")), 0);
+
+ EXPECT_LT(abc, absl::string_view("abcdefghijklmnopqrstuvwxzz"));
+ EXPECT_LT(abc.compare(absl::string_view("abcdefghijklmnopqrstuvwxzz")), 0);
+
+ EXPECT_GT(abc, absl::string_view("abcdefghijklmnopqrstuvwxyy"));
+ EXPECT_GT(abc.compare(absl::string_view("abcdefghijklmnopqrstuvwxyy")), 0);
+
+ // The "substr" variants of `compare`.
+ absl::string_view digits("0123456789");
+ auto npos = absl::string_view::npos;
+
+ // Taking string_view
+ EXPECT_EQ(digits.compare(3, npos, absl::string_view("3456789")), 0); // 2
+ EXPECT_EQ(digits.compare(3, 4, absl::string_view("3456")), 0); // 2
+ EXPECT_EQ(digits.compare(10, 0, absl::string_view()), 0); // 2
+ EXPECT_EQ(digits.compare(3, 4, absl::string_view("0123456789"), 3, 4),
+ 0); // 3
+ EXPECT_LT(digits.compare(3, 4, absl::string_view("0123456789"), 3, 5),
+ 0); // 3
+ EXPECT_LT(digits.compare(0, npos, absl::string_view("0123456789"), 3, 5),
+ 0); // 3
+ // Taking const char*
+ EXPECT_EQ(digits.compare(3, 4, "3456"), 0); // 5
+ EXPECT_EQ(digits.compare(3, npos, "3456789"), 0); // 5
+ EXPECT_EQ(digits.compare(10, 0, ""), 0); // 5
+ EXPECT_EQ(digits.compare(3, 4, "0123456789", 3, 4), 0); // 6
+ EXPECT_LT(digits.compare(3, 4, "0123456789", 3, 5), 0); // 6
+ EXPECT_LT(digits.compare(0, npos, "0123456789", 3, 5), 0); // 6
+}
+
+TEST(StringViewTest, At) {
+ absl::string_view abc = "abc";
+ EXPECT_EQ(abc.at(0), 'a');
+ EXPECT_EQ(abc.at(1), 'b');
+ EXPECT_EQ(abc.at(2), 'c');
+#ifdef ABSL_HAVE_EXCEPTIONS
+ EXPECT_THROW(abc.at(3), std::out_of_range);
+#else
+ ABSL_EXPECT_DEATH_IF_SUPPORTED(abc.at(3), "absl::string_view::at");
+#endif
+}
+
+struct MyCharAlloc : std::allocator<char> {};
+
+TEST(StringViewTest, ExplicitConversionOperator) {
+ absl::string_view sp = "hi";
+ EXPECT_EQ(sp, std::string(sp));
+}
+
+TEST(StringViewTest, NullSafeStringView) {
+ {
+ absl::string_view s = absl::NullSafeStringView(nullptr);
+ EXPECT_EQ(nullptr, s.data());
+ EXPECT_EQ(0, s.size());
+ EXPECT_EQ(absl::string_view(), s);
+ }
+ {
+ static const char kHi[] = "hi";
+ absl::string_view s = absl::NullSafeStringView(kHi);
+ EXPECT_EQ(kHi, s.data());
+ EXPECT_EQ(strlen(kHi), s.size());
+ EXPECT_EQ(absl::string_view("hi"), s);
+ }
+}
+
+TEST(StringViewTest, ConstexprNullSafeStringView) {
+ {
+ constexpr absl::string_view s = absl::NullSafeStringView(nullptr);
+ EXPECT_EQ(nullptr, s.data());
+ EXPECT_EQ(0, s.size());
+ EXPECT_EQ(absl::string_view(), s);
+ }
+#if !defined(_MSC_VER) || _MSC_VER >= 1910
+ // MSVC 2017+ is required for good constexpr string_view support.
+ // See the implementation of `absl::string_view::StrlenInternal()`.
+ {
+ static constexpr char kHi[] = "hi";
+ absl::string_view s = absl::NullSafeStringView(kHi);
+ EXPECT_EQ(kHi, s.data());
+ EXPECT_EQ(strlen(kHi), s.size());
+ EXPECT_EQ(absl::string_view("hi"), s);
+ }
+ {
+ constexpr absl::string_view s = absl::NullSafeStringView("hello");
+ EXPECT_EQ(s.size(), 5);
+ EXPECT_EQ("hello", s);
+ }
+#endif
+}
+
+TEST(StringViewTest, ConstexprCompiles) {
+ constexpr absl::string_view sp;
+#ifdef ABSL_HAVE_STRING_VIEW_FROM_NULLPTR
+ constexpr absl::string_view cstr(nullptr);
+#endif
+ constexpr absl::string_view cstr_len("cstr", 4);
+
+#if defined(ABSL_USES_STD_STRING_VIEW)
+ // In libstdc++ (as of 7.2), `std::string_view::string_view(const char*)`
+ // calls `std::char_traits<char>::length(const char*)` to get the string
+ // length, but it is not marked constexpr yet. See GCC bug:
+ // https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78156
+ // Also, there is a LWG issue that adds constexpr to length() which was just
+ // resolved 2017-06-02. See
+ // http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2232
+ // TODO(zhangxy): Update the condition when libstdc++ adopts the constexpr
+ // length().
+#if !defined(__GLIBCXX__)
+#define ABSL_HAVE_CONSTEXPR_STRING_VIEW_FROM_CSTR 1
+#endif // !__GLIBCXX__
+
+#else // ABSL_USES_STD_STRING_VIEW
+
+// This duplicates the check for __builtin_strlen in the header.
+#if ABSL_HAVE_BUILTIN(__builtin_strlen) || \
+ (defined(__GNUC__) && !defined(__clang__))
+#define ABSL_HAVE_CONSTEXPR_STRING_VIEW_FROM_CSTR 1
+#elif defined(__GNUC__) // GCC or clang
+#error GCC/clang should have constexpr string_view.
+#endif
+
+// MSVC 2017+ should be able to construct a constexpr string_view from a cstr.
+#if defined(_MSC_VER) && _MSC_VER >= 1910
+#define ABSL_HAVE_CONSTEXPR_STRING_VIEW_FROM_CSTR 1
+#endif
+
+#endif // ABSL_USES_STD_STRING_VIEW
+
+#ifdef ABSL_HAVE_CONSTEXPR_STRING_VIEW_FROM_CSTR
+ constexpr absl::string_view cstr_strlen("foo");
+ EXPECT_EQ(cstr_strlen.length(), 3);
+ constexpr absl::string_view cstr_strlen2 = "bar";
+ EXPECT_EQ(cstr_strlen2, "bar");
+
+#if ABSL_HAVE_BUILTIN(__builtin_memcmp) || \
+ (defined(__GNUC__) && !defined(__clang__))
+#define ABSL_HAVE_CONSTEXPR_STRING_VIEW_COMPARISON 1
+#endif
+#ifdef ABSL_HAVE_CONSTEXPR_STRING_VIEW_COMPARISON
+ constexpr absl::string_view foo = "foo";
+ constexpr absl::string_view bar = "bar";
+ constexpr bool foo_eq_bar = foo == bar;
+ constexpr bool foo_ne_bar = foo != bar;
+ constexpr bool foo_lt_bar = foo < bar;
+ constexpr bool foo_le_bar = foo <= bar;
+ constexpr bool foo_gt_bar = foo > bar;
+ constexpr bool foo_ge_bar = foo >= bar;
+ constexpr int foo_compare_bar = foo.compare(bar);
+ EXPECT_FALSE(foo_eq_bar);
+ EXPECT_TRUE(foo_ne_bar);
+ EXPECT_FALSE(foo_lt_bar);
+ EXPECT_FALSE(foo_le_bar);
+ EXPECT_TRUE(foo_gt_bar);
+ EXPECT_TRUE(foo_ge_bar);
+ EXPECT_GT(foo_compare_bar, 0);
+#endif
+#endif
+
+#if !defined(__clang__) || 3 < __clang_major__ || \
+ (3 == __clang_major__ && 4 < __clang_minor__)
+ // older clang versions (< 3.5) complain that:
+ // "cannot perform pointer arithmetic on null pointer"
+ constexpr absl::string_view::iterator const_begin_empty = sp.begin();
+ constexpr absl::string_view::iterator const_end_empty = sp.end();
+ EXPECT_EQ(const_begin_empty, const_end_empty);
+
+#ifdef ABSL_HAVE_STRING_VIEW_FROM_NULLPTR
+ constexpr absl::string_view::iterator const_begin_nullptr = cstr.begin();
+ constexpr absl::string_view::iterator const_end_nullptr = cstr.end();
+ EXPECT_EQ(const_begin_nullptr, const_end_nullptr);
+#endif // ABSL_HAVE_STRING_VIEW_FROM_NULLPTR
+#endif // !defined(__clang__) || ...
+
+ constexpr absl::string_view::iterator const_begin = cstr_len.begin();
+ constexpr absl::string_view::iterator const_end = cstr_len.end();
+ constexpr absl::string_view::size_type const_size = cstr_len.size();
+ constexpr absl::string_view::size_type const_length = cstr_len.length();
+ static_assert(const_begin + const_size == const_end,
+ "pointer arithmetic check");
+ static_assert(const_begin + const_length == const_end,
+ "pointer arithmetic check");
+#ifndef _MSC_VER
+ // MSVC has bugs doing constexpr pointer arithmetic.
+ // https://developercommunity.visualstudio.com/content/problem/482192/bad-pointer-arithmetic-in-constepxr-2019-rc1-svc1.html
+ EXPECT_EQ(const_begin + const_size, const_end);
+ EXPECT_EQ(const_begin + const_length, const_end);
+#endif
+
+ constexpr bool isempty = sp.empty();
+ EXPECT_TRUE(isempty);
+
+ constexpr const char c = cstr_len[2];
+ EXPECT_EQ(c, 't');
+
+ constexpr const char cfront = cstr_len.front();
+ constexpr const char cback = cstr_len.back();
+ EXPECT_EQ(cfront, 'c');
+ EXPECT_EQ(cback, 'r');
+
+ constexpr const char* np = sp.data();
+ constexpr const char* cstr_ptr = cstr_len.data();
+ EXPECT_EQ(np, nullptr);
+ EXPECT_NE(cstr_ptr, nullptr);
+
+ constexpr size_t sp_npos = sp.npos;
+ EXPECT_EQ(sp_npos, -1);
+}
+
+TEST(StringViewTest, ConstexprSubstr) {
+ constexpr absl::string_view foobar("foobar", 6);
+ constexpr absl::string_view foo = foobar.substr(0, 3);
+ constexpr absl::string_view bar = foobar.substr(3);
+ EXPECT_EQ(foo, "foo");
+ EXPECT_EQ(bar, "bar");
+}
+
+TEST(StringViewTest, Noexcept) {
+ EXPECT_TRUE((std::is_nothrow_constructible<absl::string_view,
+ const std::string&>::value));
+ EXPECT_TRUE((std::is_nothrow_constructible<absl::string_view,
+ const std::string&>::value));
+ EXPECT_TRUE(std::is_nothrow_constructible<absl::string_view>::value);
+ constexpr absl::string_view sp;
+ EXPECT_TRUE(noexcept(sp.begin()));
+ EXPECT_TRUE(noexcept(sp.end()));
+ EXPECT_TRUE(noexcept(sp.cbegin()));
+ EXPECT_TRUE(noexcept(sp.cend()));
+ EXPECT_TRUE(noexcept(sp.rbegin()));
+ EXPECT_TRUE(noexcept(sp.rend()));
+ EXPECT_TRUE(noexcept(sp.crbegin()));
+ EXPECT_TRUE(noexcept(sp.crend()));
+ EXPECT_TRUE(noexcept(sp.size()));
+ EXPECT_TRUE(noexcept(sp.length()));
+ EXPECT_TRUE(noexcept(sp.empty()));
+ EXPECT_TRUE(noexcept(sp.data()));
+ EXPECT_TRUE(noexcept(sp.compare(sp)));
+ EXPECT_TRUE(noexcept(sp.find(sp)));
+ EXPECT_TRUE(noexcept(sp.find('f')));
+ EXPECT_TRUE(noexcept(sp.rfind(sp)));
+ EXPECT_TRUE(noexcept(sp.rfind('f')));
+ EXPECT_TRUE(noexcept(sp.find_first_of(sp)));
+ EXPECT_TRUE(noexcept(sp.find_first_of('f')));
+ EXPECT_TRUE(noexcept(sp.find_last_of(sp)));
+ EXPECT_TRUE(noexcept(sp.find_last_of('f')));
+ EXPECT_TRUE(noexcept(sp.find_first_not_of(sp)));
+ EXPECT_TRUE(noexcept(sp.find_first_not_of('f')));
+ EXPECT_TRUE(noexcept(sp.find_last_not_of(sp)));
+ EXPECT_TRUE(noexcept(sp.find_last_not_of('f')));
+}
+
+TEST(StringViewTest, BoundsCheck) {
+#ifndef ABSL_USES_STD_STRING_VIEW
+#if !defined(NDEBUG) || ABSL_OPTION_HARDENED
+ // Abseil's string_view implementation has bounds-checking in debug mode.
+ absl::string_view h = "hello";
+ ABSL_EXPECT_DEATH_IF_SUPPORTED(h[5], "");
+ ABSL_EXPECT_DEATH_IF_SUPPORTED(h[-1], "");
+#endif
+#endif
+}
+
+TEST(ComparisonOpsTest, StringCompareNotAmbiguous) {
+ EXPECT_EQ("hello", std::string("hello"));
+ EXPECT_LT("hello", std::string("world"));
+}
+
+TEST(ComparisonOpsTest, HeterogenousStringViewEquals) {
+ EXPECT_EQ(absl::string_view("hello"), std::string("hello"));
+ EXPECT_EQ("hello", absl::string_view("hello"));
+}
+
+TEST(FindOneCharTest, EdgeCases) {
+ absl::string_view a("xxyyyxx");
+
+ // Set a = "xyyyx".
+ a.remove_prefix(1);
+ a.remove_suffix(1);
+
+ EXPECT_EQ(0, a.find('x'));
+ EXPECT_EQ(0, a.find('x', 0));
+ EXPECT_EQ(4, a.find('x', 1));
+ EXPECT_EQ(4, a.find('x', 4));
+ EXPECT_EQ(absl::string_view::npos, a.find('x', 5));
+
+ EXPECT_EQ(4, a.rfind('x'));
+ EXPECT_EQ(4, a.rfind('x', 5));
+ EXPECT_EQ(4, a.rfind('x', 4));
+ EXPECT_EQ(0, a.rfind('x', 3));
+ EXPECT_EQ(0, a.rfind('x', 0));
+
+ // Set a = "yyy".
+ a.remove_prefix(1);
+ a.remove_suffix(1);
+
+ EXPECT_EQ(absl::string_view::npos, a.find('x'));
+ EXPECT_EQ(absl::string_view::npos, a.rfind('x'));
+}
+
+#ifndef ABSL_HAVE_THREAD_SANITIZER // Allocates too much memory for tsan.
+TEST(HugeStringView, TwoPointTwoGB) {
+ if (sizeof(size_t) <= 4)
+ return;
+ // Try a huge string piece.
+ const size_t size = size_t{2200} * 1000 * 1000;
+ std::string s(size, 'a');
+ absl::string_view sp(s);
+ EXPECT_EQ(size, sp.length());
+ sp.remove_prefix(1);
+ EXPECT_EQ(size - 1, sp.length());
+ sp.remove_suffix(2);
+ EXPECT_EQ(size - 1 - 2, sp.length());
+}
+#endif // ABSL_HAVE_THREAD_SANITIZER
+
+#if !defined(NDEBUG) && !defined(ABSL_USES_STD_STRING_VIEW)
+TEST(NonNegativeLenTest, NonNegativeLen) {
+ ABSL_EXPECT_DEATH_IF_SUPPORTED(absl::string_view("xyz", -1),
+ "len <= kMaxSize");
+}
+
+TEST(LenExceedsMaxSizeTest, LenExceedsMaxSize) {
+ auto max_size = absl::string_view().max_size();
+
+ // This should construct ok (although the view itself is obviously invalid).
+ absl::string_view ok_view("", max_size);
+
+ // Adding one to the max should trigger an assertion.
+ ABSL_EXPECT_DEATH_IF_SUPPORTED(absl::string_view("", max_size + 1),
+ "len <= kMaxSize");
+}
+#endif // !defined(NDEBUG) && !defined(ABSL_USES_STD_STRING_VIEW)
+
+class StringViewStreamTest : public ::testing::Test {
+ public:
+ // Set negative 'width' for right justification.
+ template <typename T>
+ std::string Pad(const T& s, int width, char fill = 0) {
+ std::ostringstream oss;
+ if (fill != 0) {
+ oss << std::setfill(fill);
+ }
+ if (width < 0) {
+ width = -width;
+ oss << std::right;
+ }
+ oss << std::setw(width) << s;
+ return oss.str();
+ }
+};
+
+TEST_F(StringViewStreamTest, Padding) {
+ std::string s("hello");
+ absl::string_view sp(s);
+ for (int w = -64; w < 64; ++w) {
+ SCOPED_TRACE(w);
+ EXPECT_EQ(Pad(s, w), Pad(sp, w));
+ }
+ for (int w = -64; w < 64; ++w) {
+ SCOPED_TRACE(w);
+ EXPECT_EQ(Pad(s, w, '#'), Pad(sp, w, '#'));
+ }
+}
+
+TEST_F(StringViewStreamTest, ResetsWidth) {
+ // Width should reset after one formatted write.
+ // If we weren't resetting width after formatting the string_view,
+ // we'd have width=5 carrying over to the printing of the "]",
+ // creating "[###hi####]".
+ std::string s = "hi";
+ absl::string_view sp = s;
+ {
+ std::ostringstream oss;
+ oss << "[" << std::setfill('#') << std::setw(5) << s << "]";
+ ASSERT_EQ("[###hi]", oss.str());
+ }
+ {
+ std::ostringstream oss;
+ oss << "[" << std::setfill('#') << std::setw(5) << sp << "]";
+ EXPECT_EQ("[###hi]", oss.str());
+ }
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/strings/strip.h b/third_party/abseil/src/absl/strings/strip.h
new file mode 100644
index 0000000..111872c
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/strip.h
@@ -0,0 +1,91 @@
+//
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: strip.h
+// -----------------------------------------------------------------------------
+//
+// This file contains various functions for stripping substrings from a string.
+#ifndef ABSL_STRINGS_STRIP_H_
+#define ABSL_STRINGS_STRIP_H_
+
+#include <cstddef>
+#include <string>
+
+#include "absl/base/macros.h"
+#include "absl/strings/ascii.h"
+#include "absl/strings/match.h"
+#include "absl/strings/string_view.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+// ConsumePrefix()
+//
+// Strips the `expected` prefix from the start of the given string, returning
+// `true` if the strip operation succeeded or false otherwise.
+//
+// Example:
+//
+// absl::string_view input("abc");
+// EXPECT_TRUE(absl::ConsumePrefix(&input, "a"));
+// EXPECT_EQ(input, "bc");
+inline bool ConsumePrefix(absl::string_view* str, absl::string_view expected) {
+ if (!absl::StartsWith(*str, expected)) return false;
+ str->remove_prefix(expected.size());
+ return true;
+}
+// ConsumeSuffix()
+//
+// Strips the `expected` suffix from the end of the given string, returning
+// `true` if the strip operation succeeded or false otherwise.
+//
+// Example:
+//
+// absl::string_view input("abcdef");
+// EXPECT_TRUE(absl::ConsumeSuffix(&input, "def"));
+// EXPECT_EQ(input, "abc");
+inline bool ConsumeSuffix(absl::string_view* str, absl::string_view expected) {
+ if (!absl::EndsWith(*str, expected)) return false;
+ str->remove_suffix(expected.size());
+ return true;
+}
+
+// StripPrefix()
+//
+// Returns a view into the input string 'str' with the given 'prefix' removed,
+// but leaving the original string intact. If the prefix does not match at the
+// start of the string, returns the original string instead.
+ABSL_MUST_USE_RESULT inline absl::string_view StripPrefix(
+ absl::string_view str, absl::string_view prefix) {
+ if (absl::StartsWith(str, prefix)) str.remove_prefix(prefix.size());
+ return str;
+}
+
+// StripSuffix()
+//
+// Returns a view into the input string 'str' with the given 'suffix' removed,
+// but leaving the original string intact. If the suffix does not match at the
+// end of the string, returns the original string instead.
+ABSL_MUST_USE_RESULT inline absl::string_view StripSuffix(
+ absl::string_view str, absl::string_view suffix) {
+ if (absl::EndsWith(str, suffix)) str.remove_suffix(suffix.size());
+ return str;
+}
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_STRINGS_STRIP_H_
diff --git a/third_party/abseil/src/absl/strings/strip_test.cc b/third_party/abseil/src/absl/strings/strip_test.cc
new file mode 100644
index 0000000..e4e00cb
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/strip_test.cc
@@ -0,0 +1,198 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// This file contains functions that remove a defined part from the string,
+// i.e., strip the string.
+
+#include "absl/strings/strip.h"
+
+#include <cassert>
+#include <cstdio>
+#include <cstring>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/strings/string_view.h"
+
+namespace {
+
+TEST(Strip, ConsumePrefixOneChar) {
+ absl::string_view input("abc");
+ EXPECT_TRUE(absl::ConsumePrefix(&input, "a"));
+ EXPECT_EQ(input, "bc");
+
+ EXPECT_FALSE(absl::ConsumePrefix(&input, "x"));
+ EXPECT_EQ(input, "bc");
+
+ EXPECT_TRUE(absl::ConsumePrefix(&input, "b"));
+ EXPECT_EQ(input, "c");
+
+ EXPECT_TRUE(absl::ConsumePrefix(&input, "c"));
+ EXPECT_EQ(input, "");
+
+ EXPECT_FALSE(absl::ConsumePrefix(&input, "a"));
+ EXPECT_EQ(input, "");
+}
+
+TEST(Strip, ConsumePrefix) {
+ absl::string_view input("abcdef");
+ EXPECT_FALSE(absl::ConsumePrefix(&input, "abcdefg"));
+ EXPECT_EQ(input, "abcdef");
+
+ EXPECT_FALSE(absl::ConsumePrefix(&input, "abce"));
+ EXPECT_EQ(input, "abcdef");
+
+ EXPECT_TRUE(absl::ConsumePrefix(&input, ""));
+ EXPECT_EQ(input, "abcdef");
+
+ EXPECT_FALSE(absl::ConsumePrefix(&input, "abcdeg"));
+ EXPECT_EQ(input, "abcdef");
+
+ EXPECT_TRUE(absl::ConsumePrefix(&input, "abcdef"));
+ EXPECT_EQ(input, "");
+
+ input = "abcdef";
+ EXPECT_TRUE(absl::ConsumePrefix(&input, "abcde"));
+ EXPECT_EQ(input, "f");
+}
+
+TEST(Strip, ConsumeSuffix) {
+ absl::string_view input("abcdef");
+ EXPECT_FALSE(absl::ConsumeSuffix(&input, "abcdefg"));
+ EXPECT_EQ(input, "abcdef");
+
+ EXPECT_TRUE(absl::ConsumeSuffix(&input, ""));
+ EXPECT_EQ(input, "abcdef");
+
+ EXPECT_TRUE(absl::ConsumeSuffix(&input, "def"));
+ EXPECT_EQ(input, "abc");
+
+ input = "abcdef";
+ EXPECT_FALSE(absl::ConsumeSuffix(&input, "abcdeg"));
+ EXPECT_EQ(input, "abcdef");
+
+ EXPECT_TRUE(absl::ConsumeSuffix(&input, "f"));
+ EXPECT_EQ(input, "abcde");
+
+ EXPECT_TRUE(absl::ConsumeSuffix(&input, "abcde"));
+ EXPECT_EQ(input, "");
+}
+
+TEST(Strip, StripPrefix) {
+ const absl::string_view null_str;
+
+ EXPECT_EQ(absl::StripPrefix("foobar", "foo"), "bar");
+ EXPECT_EQ(absl::StripPrefix("foobar", ""), "foobar");
+ EXPECT_EQ(absl::StripPrefix("foobar", null_str), "foobar");
+ EXPECT_EQ(absl::StripPrefix("foobar", "foobar"), "");
+ EXPECT_EQ(absl::StripPrefix("foobar", "bar"), "foobar");
+ EXPECT_EQ(absl::StripPrefix("foobar", "foobarr"), "foobar");
+ EXPECT_EQ(absl::StripPrefix("", ""), "");
+}
+
+TEST(Strip, StripSuffix) {
+ const absl::string_view null_str;
+
+ EXPECT_EQ(absl::StripSuffix("foobar", "bar"), "foo");
+ EXPECT_EQ(absl::StripSuffix("foobar", ""), "foobar");
+ EXPECT_EQ(absl::StripSuffix("foobar", null_str), "foobar");
+ EXPECT_EQ(absl::StripSuffix("foobar", "foobar"), "");
+ EXPECT_EQ(absl::StripSuffix("foobar", "foo"), "foobar");
+ EXPECT_EQ(absl::StripSuffix("foobar", "ffoobar"), "foobar");
+ EXPECT_EQ(absl::StripSuffix("", ""), "");
+}
+
+TEST(Strip, RemoveExtraAsciiWhitespace) {
+ const char* inputs[] = {
+ "No extra space",
+ " Leading whitespace",
+ "Trailing whitespace ",
+ " Leading and trailing ",
+ " Whitespace \t in\v middle ",
+ "'Eeeeep! \n Newlines!\n",
+ "nospaces",
+ };
+ const char* outputs[] = {
+ "No extra space",
+ "Leading whitespace",
+ "Trailing whitespace",
+ "Leading and trailing",
+ "Whitespace in middle",
+ "'Eeeeep! Newlines!",
+ "nospaces",
+ };
+ int NUM_TESTS = 7;
+
+ for (int i = 0; i < NUM_TESTS; i++) {
+ std::string s(inputs[i]);
+ absl::RemoveExtraAsciiWhitespace(&s);
+ EXPECT_STREQ(outputs[i], s.c_str());
+ }
+
+ // Test that absl::RemoveExtraAsciiWhitespace returns immediately for empty
+ // strings (It was adding the \0 character to the C++ std::string, which broke
+ // tests involving empty())
+ std::string zero_string = "";
+ assert(zero_string.empty());
+ absl::RemoveExtraAsciiWhitespace(&zero_string);
+ EXPECT_EQ(zero_string.size(), 0);
+ EXPECT_TRUE(zero_string.empty());
+}
+
+TEST(Strip, StripTrailingAsciiWhitespace) {
+ std::string test = "foo ";
+ absl::StripTrailingAsciiWhitespace(&test);
+ EXPECT_EQ(test, "foo");
+
+ test = " ";
+ absl::StripTrailingAsciiWhitespace(&test);
+ EXPECT_EQ(test, "");
+
+ test = "";
+ absl::StripTrailingAsciiWhitespace(&test);
+ EXPECT_EQ(test, "");
+
+ test = " abc\t";
+ absl::StripTrailingAsciiWhitespace(&test);
+ EXPECT_EQ(test, " abc");
+}
+
+TEST(String, StripLeadingAsciiWhitespace) {
+ absl::string_view orig = "\t \n\f\r\n\vfoo";
+ EXPECT_EQ("foo", absl::StripLeadingAsciiWhitespace(orig));
+ orig = "\t \n\f\r\v\n\t \n\f\r\v\n";
+ EXPECT_EQ(absl::string_view(), absl::StripLeadingAsciiWhitespace(orig));
+}
+
+TEST(Strip, StripAsciiWhitespace) {
+ std::string test2 = "\t \f\r\n\vfoo \t\f\r\v\n";
+ absl::StripAsciiWhitespace(&test2);
+ EXPECT_EQ(test2, "foo");
+ std::string test3 = "bar";
+ absl::StripAsciiWhitespace(&test3);
+ EXPECT_EQ(test3, "bar");
+ std::string test4 = "\t \f\r\n\vfoo";
+ absl::StripAsciiWhitespace(&test4);
+ EXPECT_EQ(test4, "foo");
+ std::string test5 = "foo \t\f\r\v\n";
+ absl::StripAsciiWhitespace(&test5);
+ EXPECT_EQ(test5, "foo");
+ absl::string_view test6("\t \f\r\n\vfoo \t\f\r\v\n");
+ test6 = absl::StripAsciiWhitespace(test6);
+ EXPECT_EQ(test6, "foo");
+ test6 = absl::StripAsciiWhitespace(test6);
+ EXPECT_EQ(test6, "foo"); // already stripped
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/strings/substitute.cc b/third_party/abseil/src/absl/strings/substitute.cc
new file mode 100644
index 0000000..1f3c740
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/substitute.cc
@@ -0,0 +1,171 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/strings/substitute.h"
+
+#include <algorithm>
+
+#include "absl/base/internal/raw_logging.h"
+#include "absl/strings/ascii.h"
+#include "absl/strings/escaping.h"
+#include "absl/strings/internal/resize_uninitialized.h"
+#include "absl/strings/string_view.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace substitute_internal {
+
+void SubstituteAndAppendArray(std::string* output, absl::string_view format,
+ const absl::string_view* args_array,
+ size_t num_args) {
+ // Determine total size needed.
+ size_t size = 0;
+ for (size_t i = 0; i < format.size(); i++) {
+ if (format[i] == '$') {
+ if (i + 1 >= format.size()) {
+#ifndef NDEBUG
+ ABSL_RAW_LOG(FATAL,
+ "Invalid absl::Substitute() format string: \"%s\".",
+ absl::CEscape(format).c_str());
+#endif
+ return;
+ } else if (absl::ascii_isdigit(format[i + 1])) {
+ int index = format[i + 1] - '0';
+ if (static_cast<size_t>(index) >= num_args) {
+#ifndef NDEBUG
+ ABSL_RAW_LOG(
+ FATAL,
+ "Invalid absl::Substitute() format string: asked for \"$"
+ "%d\", but only %d args were given. Full format string was: "
+ "\"%s\".",
+ index, static_cast<int>(num_args), absl::CEscape(format).c_str());
+#endif
+ return;
+ }
+ size += args_array[index].size();
+ ++i; // Skip next char.
+ } else if (format[i + 1] == '$') {
+ ++size;
+ ++i; // Skip next char.
+ } else {
+#ifndef NDEBUG
+ ABSL_RAW_LOG(FATAL,
+ "Invalid absl::Substitute() format string: \"%s\".",
+ absl::CEscape(format).c_str());
+#endif
+ return;
+ }
+ } else {
+ ++size;
+ }
+ }
+
+ if (size == 0) return;
+
+ // Build the string.
+ size_t original_size = output->size();
+ strings_internal::STLStringResizeUninitialized(output, original_size + size);
+ char* target = &(*output)[original_size];
+ for (size_t i = 0; i < format.size(); i++) {
+ if (format[i] == '$') {
+ if (absl::ascii_isdigit(format[i + 1])) {
+ const absl::string_view src = args_array[format[i + 1] - '0'];
+ target = std::copy(src.begin(), src.end(), target);
+ ++i; // Skip next char.
+ } else if (format[i + 1] == '$') {
+ *target++ = '$';
+ ++i; // Skip next char.
+ }
+ } else {
+ *target++ = format[i];
+ }
+ }
+
+ assert(target == output->data() + output->size());
+}
+
+Arg::Arg(const void* value) {
+ static_assert(sizeof(scratch_) >= sizeof(value) * 2 + 2,
+ "fix sizeof(scratch_)");
+ if (value == nullptr) {
+ piece_ = "NULL";
+ } else {
+ char* ptr = scratch_ + sizeof(scratch_);
+ uintptr_t num = reinterpret_cast<uintptr_t>(value);
+ do {
+ *--ptr = absl::numbers_internal::kHexChar[num & 0xf];
+ num >>= 4;
+ } while (num != 0);
+ *--ptr = 'x';
+ *--ptr = '0';
+ piece_ = absl::string_view(ptr, scratch_ + sizeof(scratch_) - ptr);
+ }
+}
+
+// TODO(jorg): Don't duplicate so much code between here and str_cat.cc
+Arg::Arg(Hex hex) {
+ char* const end = &scratch_[numbers_internal::kFastToBufferSize];
+ char* writer = end;
+ uint64_t value = hex.value;
+ do {
+ *--writer = absl::numbers_internal::kHexChar[value & 0xF];
+ value >>= 4;
+ } while (value != 0);
+
+ char* beg;
+ if (end - writer < hex.width) {
+ beg = end - hex.width;
+ std::fill_n(beg, writer - beg, hex.fill);
+ } else {
+ beg = writer;
+ }
+
+ piece_ = absl::string_view(beg, end - beg);
+}
+
+// TODO(jorg): Don't duplicate so much code between here and str_cat.cc
+Arg::Arg(Dec dec) {
+ assert(dec.width <= numbers_internal::kFastToBufferSize);
+ char* const end = &scratch_[numbers_internal::kFastToBufferSize];
+ char* const minfill = end - dec.width;
+ char* writer = end;
+ uint64_t value = dec.value;
+ bool neg = dec.neg;
+ while (value > 9) {
+ *--writer = '0' + (value % 10);
+ value /= 10;
+ }
+ *--writer = '0' + value;
+ if (neg) *--writer = '-';
+
+ ptrdiff_t fillers = writer - minfill;
+ if (fillers > 0) {
+ // Tricky: if the fill character is ' ', then it's <fill><+/-><digits>
+ // But...: if the fill character is '0', then it's <+/-><fill><digits>
+ bool add_sign_again = false;
+ if (neg && dec.fill == '0') { // If filling with '0',
+ ++writer; // ignore the sign we just added
+ add_sign_again = true; // and re-add the sign later.
+ }
+ writer -= fillers;
+ std::fill_n(writer, fillers, dec.fill);
+ if (add_sign_again) *--writer = '-';
+ }
+
+ piece_ = absl::string_view(writer, end - writer);
+}
+
+} // namespace substitute_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/strings/substitute.h b/third_party/abseil/src/absl/strings/substitute.h
new file mode 100644
index 0000000..c6da4dc
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/substitute.h
@@ -0,0 +1,696 @@
+//
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: substitute.h
+// -----------------------------------------------------------------------------
+//
+// This package contains functions for efficiently performing string
+// substitutions using a format string with positional notation:
+// `Substitute()` and `SubstituteAndAppend()`.
+//
+// Unlike printf-style format specifiers, `Substitute()` functions do not need
+// to specify the type of the substitution arguments. Supported arguments
+// following the format string, such as strings, string_views, ints,
+// floats, and bools, are automatically converted to strings during the
+// substitution process. (See below for a full list of supported types.)
+//
+// `Substitute()` does not allow you to specify *how* to format a value, beyond
+// the default conversion to string. For example, you cannot format an integer
+// in hex.
+//
+// The format string uses positional identifiers indicated by a dollar sign ($)
+// and single digit positional ids to indicate which substitution arguments to
+// use at that location within the format string.
+//
+// A '$$' sequence in the format string causes a literal '$' character to be
+// output.
+//
+// Example 1:
+// std::string s = Substitute("$1 purchased $0 $2 for $$10. Thanks $1!",
+// 5, "Bob", "Apples");
+// EXPECT_EQ("Bob purchased 5 Apples for $10. Thanks Bob!", s);
+//
+// Example 2:
+// std::string s = "Hi. ";
+// SubstituteAndAppend(&s, "My name is $0 and I am $1 years old.", "Bob", 5);
+// EXPECT_EQ("Hi. My name is Bob and I am 5 years old.", s);
+//
+// Supported types:
+// * absl::string_view, std::string, const char* (null is equivalent to "")
+// * int32_t, int64_t, uint32_t, uint64_t
+// * float, double
+// * bool (Printed as "true" or "false")
+// * pointer types other than char* (Printed as "0x<lower case hex string>",
+// except that null is printed as "NULL")
+//
+// If an invalid format string is provided, Substitute returns an empty string
+// and SubstituteAndAppend does not change the provided output string.
+// A format string is invalid if it:
+// * ends in an unescaped $ character,
+// e.g. "Hello $", or
+// * calls for a position argument which is not provided,
+// e.g. Substitute("Hello $2", "world"), or
+// * specifies a non-digit, non-$ character after an unescaped $ character,
+// e.g. "Hello $f".
+// In debug mode, i.e. #ifndef NDEBUG, such errors terminate the program.
+
+#ifndef ABSL_STRINGS_SUBSTITUTE_H_
+#define ABSL_STRINGS_SUBSTITUTE_H_
+
+#include <cstring>
+#include <string>
+#include <type_traits>
+#include <vector>
+
+#include "absl/base/macros.h"
+#include "absl/base/port.h"
+#include "absl/strings/ascii.h"
+#include "absl/strings/escaping.h"
+#include "absl/strings/numbers.h"
+#include "absl/strings/str_cat.h"
+#include "absl/strings/str_split.h"
+#include "absl/strings/string_view.h"
+#include "absl/strings/strip.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace substitute_internal {
+
+// Arg
+//
+// This class provides an argument type for `absl::Substitute()` and
+// `absl::SubstituteAndAppend()`. `Arg` handles implicit conversion of various
+// types to a string. (`Arg` is very similar to the `AlphaNum` class in
+// `StrCat()`.)
+//
+// This class has implicit constructors.
+class Arg {
+ public:
+ // Overloads for string-y things
+ //
+ // Explicitly overload `const char*` so the compiler doesn't cast to `bool`.
+ Arg(const char* value) // NOLINT(runtime/explicit)
+ : piece_(absl::NullSafeStringView(value)) {}
+ template <typename Allocator>
+ Arg( // NOLINT
+ const std::basic_string<char, std::char_traits<char>, Allocator>&
+ value) noexcept
+ : piece_(value) {}
+ Arg(absl::string_view value) // NOLINT(runtime/explicit)
+ : piece_(value) {}
+
+ // Overloads for primitives
+ //
+ // No overloads are available for signed and unsigned char because if people
+ // are explicitly declaring their chars as signed or unsigned then they are
+ // probably using them as 8-bit integers and would probably prefer an integer
+ // representation. However, we can't really know, so we make the caller decide
+ // what to do.
+ Arg(char value) // NOLINT(runtime/explicit)
+ : piece_(scratch_, 1) {
+ scratch_[0] = value;
+ }
+ Arg(short value) // NOLINT(*)
+ : piece_(scratch_,
+ numbers_internal::FastIntToBuffer(value, scratch_) - scratch_) {}
+ Arg(unsigned short value) // NOLINT(*)
+ : piece_(scratch_,
+ numbers_internal::FastIntToBuffer(value, scratch_) - scratch_) {}
+ Arg(int value) // NOLINT(runtime/explicit)
+ : piece_(scratch_,
+ numbers_internal::FastIntToBuffer(value, scratch_) - scratch_) {}
+ Arg(unsigned int value) // NOLINT(runtime/explicit)
+ : piece_(scratch_,
+ numbers_internal::FastIntToBuffer(value, scratch_) - scratch_) {}
+ Arg(long value) // NOLINT(*)
+ : piece_(scratch_,
+ numbers_internal::FastIntToBuffer(value, scratch_) - scratch_) {}
+ Arg(unsigned long value) // NOLINT(*)
+ : piece_(scratch_,
+ numbers_internal::FastIntToBuffer(value, scratch_) - scratch_) {}
+ Arg(long long value) // NOLINT(*)
+ : piece_(scratch_,
+ numbers_internal::FastIntToBuffer(value, scratch_) - scratch_) {}
+ Arg(unsigned long long value) // NOLINT(*)
+ : piece_(scratch_,
+ numbers_internal::FastIntToBuffer(value, scratch_) - scratch_) {}
+ Arg(float value) // NOLINT(runtime/explicit)
+ : piece_(scratch_, numbers_internal::SixDigitsToBuffer(value, scratch_)) {
+ }
+ Arg(double value) // NOLINT(runtime/explicit)
+ : piece_(scratch_, numbers_internal::SixDigitsToBuffer(value, scratch_)) {
+ }
+ Arg(bool value) // NOLINT(runtime/explicit)
+ : piece_(value ? "true" : "false") {}
+
+ Arg(Hex hex); // NOLINT(runtime/explicit)
+ Arg(Dec dec); // NOLINT(runtime/explicit)
+
+ // vector<bool>::reference and const_reference require special help to
+ // convert to `AlphaNum` because it requires two user defined conversions.
+ template <typename T,
+ absl::enable_if_t<
+ std::is_class<T>::value &&
+ (std::is_same<T, std::vector<bool>::reference>::value ||
+ std::is_same<T, std::vector<bool>::const_reference>::value)>* =
+ nullptr>
+ Arg(T value) // NOLINT(google-explicit-constructor)
+ : Arg(static_cast<bool>(value)) {}
+
+ // `void*` values, with the exception of `char*`, are printed as
+ // "0x<hex value>". However, in the case of `nullptr`, "NULL" is printed.
+ Arg(const void* value); // NOLINT(runtime/explicit)
+
+ Arg(const Arg&) = delete;
+ Arg& operator=(const Arg&) = delete;
+
+ absl::string_view piece() const { return piece_; }
+
+ private:
+ absl::string_view piece_;
+ char scratch_[numbers_internal::kFastToBufferSize];
+};
+
+// Internal helper function. Don't call this from outside this implementation.
+// This interface may change without notice.
+void SubstituteAndAppendArray(std::string* output, absl::string_view format,
+ const absl::string_view* args_array,
+ size_t num_args);
+
+#if defined(ABSL_BAD_CALL_IF)
+constexpr int CalculateOneBit(const char* format) {
+ // Returns:
+ // * 2^N for '$N' when N is in [0-9]
+ // * 0 for correct '$' escaping: '$$'.
+ // * -1 otherwise.
+ return (*format < '0' || *format > '9') ? (*format == '$' ? 0 : -1)
+ : (1 << (*format - '0'));
+}
+
+constexpr const char* SkipNumber(const char* format) {
+ return !*format ? format : (format + 1);
+}
+
+constexpr int PlaceholderBitmask(const char* format) {
+ return !*format
+ ? 0
+ : *format != '$' ? PlaceholderBitmask(format + 1)
+ : (CalculateOneBit(format + 1) |
+ PlaceholderBitmask(SkipNumber(format + 1)));
+}
+#endif // ABSL_BAD_CALL_IF
+
+} // namespace substitute_internal
+
+//
+// PUBLIC API
+//
+
+// SubstituteAndAppend()
+//
+// Substitutes variables into a given format string and appends to a given
+// output string. See file comments above for usage.
+//
+// The declarations of `SubstituteAndAppend()` below consist of overloads
+// for passing 0 to 10 arguments, respectively.
+//
+// NOTE: A zero-argument `SubstituteAndAppend()` may be used within variadic
+// templates to allow a variable number of arguments.
+//
+// Example:
+// template <typename... Args>
+// void VarMsg(std::string* boilerplate, absl::string_view format,
+// const Args&... args) {
+// absl::SubstituteAndAppend(boilerplate, format, args...);
+// }
+//
+inline void SubstituteAndAppend(std::string* output, absl::string_view format) {
+ substitute_internal::SubstituteAndAppendArray(output, format, nullptr, 0);
+}
+
+inline void SubstituteAndAppend(std::string* output, absl::string_view format,
+ const substitute_internal::Arg& a0) {
+ const absl::string_view args[] = {a0.piece()};
+ substitute_internal::SubstituteAndAppendArray(output, format, args,
+ ABSL_ARRAYSIZE(args));
+}
+
+inline void SubstituteAndAppend(std::string* output, absl::string_view format,
+ const substitute_internal::Arg& a0,
+ const substitute_internal::Arg& a1) {
+ const absl::string_view args[] = {a0.piece(), a1.piece()};
+ substitute_internal::SubstituteAndAppendArray(output, format, args,
+ ABSL_ARRAYSIZE(args));
+}
+
+inline void SubstituteAndAppend(std::string* output, absl::string_view format,
+ const substitute_internal::Arg& a0,
+ const substitute_internal::Arg& a1,
+ const substitute_internal::Arg& a2) {
+ const absl::string_view args[] = {a0.piece(), a1.piece(), a2.piece()};
+ substitute_internal::SubstituteAndAppendArray(output, format, args,
+ ABSL_ARRAYSIZE(args));
+}
+
+inline void SubstituteAndAppend(std::string* output, absl::string_view format,
+ const substitute_internal::Arg& a0,
+ const substitute_internal::Arg& a1,
+ const substitute_internal::Arg& a2,
+ const substitute_internal::Arg& a3) {
+ const absl::string_view args[] = {a0.piece(), a1.piece(), a2.piece(),
+ a3.piece()};
+ substitute_internal::SubstituteAndAppendArray(output, format, args,
+ ABSL_ARRAYSIZE(args));
+}
+
+inline void SubstituteAndAppend(std::string* output, absl::string_view format,
+ const substitute_internal::Arg& a0,
+ const substitute_internal::Arg& a1,
+ const substitute_internal::Arg& a2,
+ const substitute_internal::Arg& a3,
+ const substitute_internal::Arg& a4) {
+ const absl::string_view args[] = {a0.piece(), a1.piece(), a2.piece(),
+ a3.piece(), a4.piece()};
+ substitute_internal::SubstituteAndAppendArray(output, format, args,
+ ABSL_ARRAYSIZE(args));
+}
+
+inline void SubstituteAndAppend(std::string* output, absl::string_view format,
+ const substitute_internal::Arg& a0,
+ const substitute_internal::Arg& a1,
+ const substitute_internal::Arg& a2,
+ const substitute_internal::Arg& a3,
+ const substitute_internal::Arg& a4,
+ const substitute_internal::Arg& a5) {
+ const absl::string_view args[] = {a0.piece(), a1.piece(), a2.piece(),
+ a3.piece(), a4.piece(), a5.piece()};
+ substitute_internal::SubstituteAndAppendArray(output, format, args,
+ ABSL_ARRAYSIZE(args));
+}
+
+inline void SubstituteAndAppend(std::string* output, absl::string_view format,
+ const substitute_internal::Arg& a0,
+ const substitute_internal::Arg& a1,
+ const substitute_internal::Arg& a2,
+ const substitute_internal::Arg& a3,
+ const substitute_internal::Arg& a4,
+ const substitute_internal::Arg& a5,
+ const substitute_internal::Arg& a6) {
+ const absl::string_view args[] = {a0.piece(), a1.piece(), a2.piece(),
+ a3.piece(), a4.piece(), a5.piece(),
+ a6.piece()};
+ substitute_internal::SubstituteAndAppendArray(output, format, args,
+ ABSL_ARRAYSIZE(args));
+}
+
+inline void SubstituteAndAppend(
+ std::string* output, absl::string_view format,
+ const substitute_internal::Arg& a0, const substitute_internal::Arg& a1,
+ const substitute_internal::Arg& a2, const substitute_internal::Arg& a3,
+ const substitute_internal::Arg& a4, const substitute_internal::Arg& a5,
+ const substitute_internal::Arg& a6, const substitute_internal::Arg& a7) {
+ const absl::string_view args[] = {a0.piece(), a1.piece(), a2.piece(),
+ a3.piece(), a4.piece(), a5.piece(),
+ a6.piece(), a7.piece()};
+ substitute_internal::SubstituteAndAppendArray(output, format, args,
+ ABSL_ARRAYSIZE(args));
+}
+
+inline void SubstituteAndAppend(
+ std::string* output, absl::string_view format,
+ const substitute_internal::Arg& a0, const substitute_internal::Arg& a1,
+ const substitute_internal::Arg& a2, const substitute_internal::Arg& a3,
+ const substitute_internal::Arg& a4, const substitute_internal::Arg& a5,
+ const substitute_internal::Arg& a6, const substitute_internal::Arg& a7,
+ const substitute_internal::Arg& a8) {
+ const absl::string_view args[] = {a0.piece(), a1.piece(), a2.piece(),
+ a3.piece(), a4.piece(), a5.piece(),
+ a6.piece(), a7.piece(), a8.piece()};
+ substitute_internal::SubstituteAndAppendArray(output, format, args,
+ ABSL_ARRAYSIZE(args));
+}
+
+inline void SubstituteAndAppend(
+ std::string* output, absl::string_view format,
+ const substitute_internal::Arg& a0, const substitute_internal::Arg& a1,
+ const substitute_internal::Arg& a2, const substitute_internal::Arg& a3,
+ const substitute_internal::Arg& a4, const substitute_internal::Arg& a5,
+ const substitute_internal::Arg& a6, const substitute_internal::Arg& a7,
+ const substitute_internal::Arg& a8, const substitute_internal::Arg& a9) {
+ const absl::string_view args[] = {
+ a0.piece(), a1.piece(), a2.piece(), a3.piece(), a4.piece(),
+ a5.piece(), a6.piece(), a7.piece(), a8.piece(), a9.piece()};
+ substitute_internal::SubstituteAndAppendArray(output, format, args,
+ ABSL_ARRAYSIZE(args));
+}
+
+#if defined(ABSL_BAD_CALL_IF)
+// This body of functions catches cases where the number of placeholders
+// doesn't match the number of data arguments.
+void SubstituteAndAppend(std::string* output, const char* format)
+ ABSL_BAD_CALL_IF(substitute_internal::PlaceholderBitmask(format) != 0,
+ "There were no substitution arguments "
+ "but this format string has a $[0-9] in it");
+
+void SubstituteAndAppend(std::string* output, const char* format,
+ const substitute_internal::Arg& a0)
+ ABSL_BAD_CALL_IF(substitute_internal::PlaceholderBitmask(format) != 1,
+ "There was 1 substitution argument given, but "
+ "this format string is either missing its $0, or "
+ "contains one of $1-$9");
+
+void SubstituteAndAppend(std::string* output, const char* format,
+ const substitute_internal::Arg& a0,
+ const substitute_internal::Arg& a1)
+ ABSL_BAD_CALL_IF(substitute_internal::PlaceholderBitmask(format) != 3,
+ "There were 2 substitution arguments given, but "
+ "this format string is either missing its $0/$1, or "
+ "contains one of $2-$9");
+
+void SubstituteAndAppend(std::string* output, const char* format,
+ const substitute_internal::Arg& a0,
+ const substitute_internal::Arg& a1,
+ const substitute_internal::Arg& a2)
+ ABSL_BAD_CALL_IF(substitute_internal::PlaceholderBitmask(format) != 7,
+ "There were 3 substitution arguments given, but "
+ "this format string is either missing its $0/$1/$2, or "
+ "contains one of $3-$9");
+
+void SubstituteAndAppend(std::string* output, const char* format,
+ const substitute_internal::Arg& a0,
+ const substitute_internal::Arg& a1,
+ const substitute_internal::Arg& a2,
+ const substitute_internal::Arg& a3)
+ ABSL_BAD_CALL_IF(substitute_internal::PlaceholderBitmask(format) != 15,
+ "There were 4 substitution arguments given, but "
+ "this format string is either missing its $0-$3, or "
+ "contains one of $4-$9");
+
+void SubstituteAndAppend(std::string* output, const char* format,
+ const substitute_internal::Arg& a0,
+ const substitute_internal::Arg& a1,
+ const substitute_internal::Arg& a2,
+ const substitute_internal::Arg& a3,
+ const substitute_internal::Arg& a4)
+ ABSL_BAD_CALL_IF(substitute_internal::PlaceholderBitmask(format) != 31,
+ "There were 5 substitution arguments given, but "
+ "this format string is either missing its $0-$4, or "
+ "contains one of $5-$9");
+
+void SubstituteAndAppend(std::string* output, const char* format,
+ const substitute_internal::Arg& a0,
+ const substitute_internal::Arg& a1,
+ const substitute_internal::Arg& a2,
+ const substitute_internal::Arg& a3,
+ const substitute_internal::Arg& a4,
+ const substitute_internal::Arg& a5)
+ ABSL_BAD_CALL_IF(substitute_internal::PlaceholderBitmask(format) != 63,
+ "There were 6 substitution arguments given, but "
+ "this format string is either missing its $0-$5, or "
+ "contains one of $6-$9");
+
+void SubstituteAndAppend(
+ std::string* output, const char* format, const substitute_internal::Arg& a0,
+ const substitute_internal::Arg& a1, const substitute_internal::Arg& a2,
+ const substitute_internal::Arg& a3, const substitute_internal::Arg& a4,
+ const substitute_internal::Arg& a5, const substitute_internal::Arg& a6)
+ ABSL_BAD_CALL_IF(substitute_internal::PlaceholderBitmask(format) != 127,
+ "There were 7 substitution arguments given, but "
+ "this format string is either missing its $0-$6, or "
+ "contains one of $7-$9");
+
+void SubstituteAndAppend(
+ std::string* output, const char* format, const substitute_internal::Arg& a0,
+ const substitute_internal::Arg& a1, const substitute_internal::Arg& a2,
+ const substitute_internal::Arg& a3, const substitute_internal::Arg& a4,
+ const substitute_internal::Arg& a5, const substitute_internal::Arg& a6,
+ const substitute_internal::Arg& a7)
+ ABSL_BAD_CALL_IF(substitute_internal::PlaceholderBitmask(format) != 255,
+ "There were 8 substitution arguments given, but "
+ "this format string is either missing its $0-$7, or "
+ "contains one of $8-$9");
+
+void SubstituteAndAppend(
+ std::string* output, const char* format, const substitute_internal::Arg& a0,
+ const substitute_internal::Arg& a1, const substitute_internal::Arg& a2,
+ const substitute_internal::Arg& a3, const substitute_internal::Arg& a4,
+ const substitute_internal::Arg& a5, const substitute_internal::Arg& a6,
+ const substitute_internal::Arg& a7, const substitute_internal::Arg& a8)
+ ABSL_BAD_CALL_IF(
+ substitute_internal::PlaceholderBitmask(format) != 511,
+ "There were 9 substitution arguments given, but "
+ "this format string is either missing its $0-$8, or contains a $9");
+
+void SubstituteAndAppend(
+ std::string* output, const char* format, const substitute_internal::Arg& a0,
+ const substitute_internal::Arg& a1, const substitute_internal::Arg& a2,
+ const substitute_internal::Arg& a3, const substitute_internal::Arg& a4,
+ const substitute_internal::Arg& a5, const substitute_internal::Arg& a6,
+ const substitute_internal::Arg& a7, const substitute_internal::Arg& a8,
+ const substitute_internal::Arg& a9)
+ ABSL_BAD_CALL_IF(substitute_internal::PlaceholderBitmask(format) != 1023,
+ "There were 10 substitution arguments given, but this "
+ "format string doesn't contain all of $0 through $9");
+#endif // ABSL_BAD_CALL_IF
+
+// Substitute()
+//
+// Substitutes variables into a given format string. See file comments above
+// for usage.
+//
+// The declarations of `Substitute()` below consist of overloads for passing 0
+// to 10 arguments, respectively.
+//
+// NOTE: A zero-argument `Substitute()` may be used within variadic templates to
+// allow a variable number of arguments.
+//
+// Example:
+// template <typename... Args>
+// void VarMsg(absl::string_view format, const Args&... args) {
+// std::string s = absl::Substitute(format, args...);
+
+ABSL_MUST_USE_RESULT inline std::string Substitute(absl::string_view format) {
+ std::string result;
+ SubstituteAndAppend(&result, format);
+ return result;
+}
+
+ABSL_MUST_USE_RESULT inline std::string Substitute(
+ absl::string_view format, const substitute_internal::Arg& a0) {
+ std::string result;
+ SubstituteAndAppend(&result, format, a0);
+ return result;
+}
+
+ABSL_MUST_USE_RESULT inline std::string Substitute(
+ absl::string_view format, const substitute_internal::Arg& a0,
+ const substitute_internal::Arg& a1) {
+ std::string result;
+ SubstituteAndAppend(&result, format, a0, a1);
+ return result;
+}
+
+ABSL_MUST_USE_RESULT inline std::string Substitute(
+ absl::string_view format, const substitute_internal::Arg& a0,
+ const substitute_internal::Arg& a1, const substitute_internal::Arg& a2) {
+ std::string result;
+ SubstituteAndAppend(&result, format, a0, a1, a2);
+ return result;
+}
+
+ABSL_MUST_USE_RESULT inline std::string Substitute(
+ absl::string_view format, const substitute_internal::Arg& a0,
+ const substitute_internal::Arg& a1, const substitute_internal::Arg& a2,
+ const substitute_internal::Arg& a3) {
+ std::string result;
+ SubstituteAndAppend(&result, format, a0, a1, a2, a3);
+ return result;
+}
+
+ABSL_MUST_USE_RESULT inline std::string Substitute(
+ absl::string_view format, const substitute_internal::Arg& a0,
+ const substitute_internal::Arg& a1, const substitute_internal::Arg& a2,
+ const substitute_internal::Arg& a3, const substitute_internal::Arg& a4) {
+ std::string result;
+ SubstituteAndAppend(&result, format, a0, a1, a2, a3, a4);
+ return result;
+}
+
+ABSL_MUST_USE_RESULT inline std::string Substitute(
+ absl::string_view format, const substitute_internal::Arg& a0,
+ const substitute_internal::Arg& a1, const substitute_internal::Arg& a2,
+ const substitute_internal::Arg& a3, const substitute_internal::Arg& a4,
+ const substitute_internal::Arg& a5) {
+ std::string result;
+ SubstituteAndAppend(&result, format, a0, a1, a2, a3, a4, a5);
+ return result;
+}
+
+ABSL_MUST_USE_RESULT inline std::string Substitute(
+ absl::string_view format, const substitute_internal::Arg& a0,
+ const substitute_internal::Arg& a1, const substitute_internal::Arg& a2,
+ const substitute_internal::Arg& a3, const substitute_internal::Arg& a4,
+ const substitute_internal::Arg& a5, const substitute_internal::Arg& a6) {
+ std::string result;
+ SubstituteAndAppend(&result, format, a0, a1, a2, a3, a4, a5, a6);
+ return result;
+}
+
+ABSL_MUST_USE_RESULT inline std::string Substitute(
+ absl::string_view format, const substitute_internal::Arg& a0,
+ const substitute_internal::Arg& a1, const substitute_internal::Arg& a2,
+ const substitute_internal::Arg& a3, const substitute_internal::Arg& a4,
+ const substitute_internal::Arg& a5, const substitute_internal::Arg& a6,
+ const substitute_internal::Arg& a7) {
+ std::string result;
+ SubstituteAndAppend(&result, format, a0, a1, a2, a3, a4, a5, a6, a7);
+ return result;
+}
+
+ABSL_MUST_USE_RESULT inline std::string Substitute(
+ absl::string_view format, const substitute_internal::Arg& a0,
+ const substitute_internal::Arg& a1, const substitute_internal::Arg& a2,
+ const substitute_internal::Arg& a3, const substitute_internal::Arg& a4,
+ const substitute_internal::Arg& a5, const substitute_internal::Arg& a6,
+ const substitute_internal::Arg& a7, const substitute_internal::Arg& a8) {
+ std::string result;
+ SubstituteAndAppend(&result, format, a0, a1, a2, a3, a4, a5, a6, a7, a8);
+ return result;
+}
+
+ABSL_MUST_USE_RESULT inline std::string Substitute(
+ absl::string_view format, const substitute_internal::Arg& a0,
+ const substitute_internal::Arg& a1, const substitute_internal::Arg& a2,
+ const substitute_internal::Arg& a3, const substitute_internal::Arg& a4,
+ const substitute_internal::Arg& a5, const substitute_internal::Arg& a6,
+ const substitute_internal::Arg& a7, const substitute_internal::Arg& a8,
+ const substitute_internal::Arg& a9) {
+ std::string result;
+ SubstituteAndAppend(&result, format, a0, a1, a2, a3, a4, a5, a6, a7, a8, a9);
+ return result;
+}
+
+#if defined(ABSL_BAD_CALL_IF)
+// This body of functions catches cases where the number of placeholders
+// doesn't match the number of data arguments.
+std::string Substitute(const char* format)
+ ABSL_BAD_CALL_IF(substitute_internal::PlaceholderBitmask(format) != 0,
+ "There were no substitution arguments "
+ "but this format string has a $[0-9] in it");
+
+std::string Substitute(const char* format, const substitute_internal::Arg& a0)
+ ABSL_BAD_CALL_IF(substitute_internal::PlaceholderBitmask(format) != 1,
+ "There was 1 substitution argument given, but "
+ "this format string is either missing its $0, or "
+ "contains one of $1-$9");
+
+std::string Substitute(const char* format, const substitute_internal::Arg& a0,
+ const substitute_internal::Arg& a1)
+ ABSL_BAD_CALL_IF(substitute_internal::PlaceholderBitmask(format) != 3,
+ "There were 2 substitution arguments given, but "
+ "this format string is either missing its $0/$1, or "
+ "contains one of $2-$9");
+
+std::string Substitute(const char* format, const substitute_internal::Arg& a0,
+ const substitute_internal::Arg& a1,
+ const substitute_internal::Arg& a2)
+ ABSL_BAD_CALL_IF(substitute_internal::PlaceholderBitmask(format) != 7,
+ "There were 3 substitution arguments given, but "
+ "this format string is either missing its $0/$1/$2, or "
+ "contains one of $3-$9");
+
+std::string Substitute(const char* format, const substitute_internal::Arg& a0,
+ const substitute_internal::Arg& a1,
+ const substitute_internal::Arg& a2,
+ const substitute_internal::Arg& a3)
+ ABSL_BAD_CALL_IF(substitute_internal::PlaceholderBitmask(format) != 15,
+ "There were 4 substitution arguments given, but "
+ "this format string is either missing its $0-$3, or "
+ "contains one of $4-$9");
+
+std::string Substitute(const char* format, const substitute_internal::Arg& a0,
+ const substitute_internal::Arg& a1,
+ const substitute_internal::Arg& a2,
+ const substitute_internal::Arg& a3,
+ const substitute_internal::Arg& a4)
+ ABSL_BAD_CALL_IF(substitute_internal::PlaceholderBitmask(format) != 31,
+ "There were 5 substitution arguments given, but "
+ "this format string is either missing its $0-$4, or "
+ "contains one of $5-$9");
+
+std::string Substitute(const char* format, const substitute_internal::Arg& a0,
+ const substitute_internal::Arg& a1,
+ const substitute_internal::Arg& a2,
+ const substitute_internal::Arg& a3,
+ const substitute_internal::Arg& a4,
+ const substitute_internal::Arg& a5)
+ ABSL_BAD_CALL_IF(substitute_internal::PlaceholderBitmask(format) != 63,
+ "There were 6 substitution arguments given, but "
+ "this format string is either missing its $0-$5, or "
+ "contains one of $6-$9");
+
+std::string Substitute(const char* format, const substitute_internal::Arg& a0,
+ const substitute_internal::Arg& a1,
+ const substitute_internal::Arg& a2,
+ const substitute_internal::Arg& a3,
+ const substitute_internal::Arg& a4,
+ const substitute_internal::Arg& a5,
+ const substitute_internal::Arg& a6)
+ ABSL_BAD_CALL_IF(substitute_internal::PlaceholderBitmask(format) != 127,
+ "There were 7 substitution arguments given, but "
+ "this format string is either missing its $0-$6, or "
+ "contains one of $7-$9");
+
+std::string Substitute(const char* format, const substitute_internal::Arg& a0,
+ const substitute_internal::Arg& a1,
+ const substitute_internal::Arg& a2,
+ const substitute_internal::Arg& a3,
+ const substitute_internal::Arg& a4,
+ const substitute_internal::Arg& a5,
+ const substitute_internal::Arg& a6,
+ const substitute_internal::Arg& a7)
+ ABSL_BAD_CALL_IF(substitute_internal::PlaceholderBitmask(format) != 255,
+ "There were 8 substitution arguments given, but "
+ "this format string is either missing its $0-$7, or "
+ "contains one of $8-$9");
+
+std::string Substitute(
+ const char* format, const substitute_internal::Arg& a0,
+ const substitute_internal::Arg& a1, const substitute_internal::Arg& a2,
+ const substitute_internal::Arg& a3, const substitute_internal::Arg& a4,
+ const substitute_internal::Arg& a5, const substitute_internal::Arg& a6,
+ const substitute_internal::Arg& a7, const substitute_internal::Arg& a8)
+ ABSL_BAD_CALL_IF(
+ substitute_internal::PlaceholderBitmask(format) != 511,
+ "There were 9 substitution arguments given, but "
+ "this format string is either missing its $0-$8, or contains a $9");
+
+std::string Substitute(
+ const char* format, const substitute_internal::Arg& a0,
+ const substitute_internal::Arg& a1, const substitute_internal::Arg& a2,
+ const substitute_internal::Arg& a3, const substitute_internal::Arg& a4,
+ const substitute_internal::Arg& a5, const substitute_internal::Arg& a6,
+ const substitute_internal::Arg& a7, const substitute_internal::Arg& a8,
+ const substitute_internal::Arg& a9)
+ ABSL_BAD_CALL_IF(substitute_internal::PlaceholderBitmask(format) != 1023,
+ "There were 10 substitution arguments given, but this "
+ "format string doesn't contain all of $0 through $9");
+#endif // ABSL_BAD_CALL_IF
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_STRINGS_SUBSTITUTE_H_
diff --git a/third_party/abseil/src/absl/strings/substitute_test.cc b/third_party/abseil/src/absl/strings/substitute_test.cc
new file mode 100644
index 0000000..442c921
--- /dev/null
+++ b/third_party/abseil/src/absl/strings/substitute_test.cc
@@ -0,0 +1,204 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/strings/substitute.h"
+
+#include <cstdint>
+#include <vector>
+
+#include "gtest/gtest.h"
+#include "absl/strings/str_cat.h"
+
+namespace {
+
+TEST(SubstituteTest, Substitute) {
+ // Basic.
+ EXPECT_EQ("Hello, world!", absl::Substitute("$0, $1!", "Hello", "world"));
+
+ // Non-char* types.
+ EXPECT_EQ("123 0.2 0.1 foo true false x",
+ absl::Substitute("$0 $1 $2 $3 $4 $5 $6", 123, 0.2, 0.1f,
+ std::string("foo"), true, false, 'x'));
+
+ // All int types.
+ EXPECT_EQ(
+ "-32767 65535 "
+ "-1234567890 3234567890 "
+ "-1234567890 3234567890 "
+ "-1234567890123456789 9234567890123456789",
+ absl::Substitute(
+ "$0 $1 $2 $3 $4 $5 $6 $7",
+ static_cast<short>(-32767), // NOLINT(runtime/int)
+ static_cast<unsigned short>(65535), // NOLINT(runtime/int)
+ -1234567890, 3234567890U, -1234567890L, 3234567890UL,
+ -int64_t{1234567890123456789}, uint64_t{9234567890123456789u}));
+
+ // Hex format
+ EXPECT_EQ("0 1 f ffff0ffff 0123456789abcdef",
+ absl::Substitute("$0$1$2$3$4 $5", //
+ absl::Hex(0), absl::Hex(1, absl::kSpacePad2),
+ absl::Hex(0xf, absl::kSpacePad2),
+ absl::Hex(int16_t{-1}, absl::kSpacePad5),
+ absl::Hex(int16_t{-1}, absl::kZeroPad5),
+ absl::Hex(0x123456789abcdef, absl::kZeroPad16)));
+
+ // Dec format
+ EXPECT_EQ("0 115 -1-0001 81985529216486895",
+ absl::Substitute("$0$1$2$3$4 $5", //
+ absl::Dec(0), absl::Dec(1, absl::kSpacePad2),
+ absl::Dec(0xf, absl::kSpacePad2),
+ absl::Dec(int16_t{-1}, absl::kSpacePad5),
+ absl::Dec(int16_t{-1}, absl::kZeroPad5),
+ absl::Dec(0x123456789abcdef, absl::kZeroPad16)));
+
+ // Pointer.
+ const int* int_p = reinterpret_cast<const int*>(0x12345);
+ std::string str = absl::Substitute("$0", int_p);
+ EXPECT_EQ(absl::StrCat("0x", absl::Hex(int_p)), str);
+
+ // Volatile Pointer.
+ // Like C++ streamed I/O, such pointers implicitly become bool
+ volatile int vol = 237;
+ volatile int *volatile volptr = &vol;
+ str = absl::Substitute("$0", volptr);
+ EXPECT_EQ("true", str);
+
+ // null is special. StrCat prints 0x0. Substitute prints NULL.
+ const uint64_t* null_p = nullptr;
+ str = absl::Substitute("$0", null_p);
+ EXPECT_EQ("NULL", str);
+
+ // char* is also special.
+ const char* char_p = "print me";
+ str = absl::Substitute("$0", char_p);
+ EXPECT_EQ("print me", str);
+
+ char char_buf[16];
+ strncpy(char_buf, "print me too", sizeof(char_buf));
+ str = absl::Substitute("$0", char_buf);
+ EXPECT_EQ("print me too", str);
+
+ // null char* is "doubly" special. Represented as the empty string.
+ char_p = nullptr;
+ str = absl::Substitute("$0", char_p);
+ EXPECT_EQ("", str);
+
+ // Out-of-order.
+ EXPECT_EQ("b, a, c, b", absl::Substitute("$1, $0, $2, $1", "a", "b", "c"));
+
+ // Literal $
+ EXPECT_EQ("$", absl::Substitute("$$"));
+
+ EXPECT_EQ("$1", absl::Substitute("$$1"));
+
+ // Test all overloads.
+ EXPECT_EQ("a", absl::Substitute("$0", "a"));
+ EXPECT_EQ("a b", absl::Substitute("$0 $1", "a", "b"));
+ EXPECT_EQ("a b c", absl::Substitute("$0 $1 $2", "a", "b", "c"));
+ EXPECT_EQ("a b c d", absl::Substitute("$0 $1 $2 $3", "a", "b", "c", "d"));
+ EXPECT_EQ("a b c d e",
+ absl::Substitute("$0 $1 $2 $3 $4", "a", "b", "c", "d", "e"));
+ EXPECT_EQ("a b c d e f", absl::Substitute("$0 $1 $2 $3 $4 $5", "a", "b", "c",
+ "d", "e", "f"));
+ EXPECT_EQ("a b c d e f g", absl::Substitute("$0 $1 $2 $3 $4 $5 $6", "a", "b",
+ "c", "d", "e", "f", "g"));
+ EXPECT_EQ("a b c d e f g h",
+ absl::Substitute("$0 $1 $2 $3 $4 $5 $6 $7", "a", "b", "c", "d", "e",
+ "f", "g", "h"));
+ EXPECT_EQ("a b c d e f g h i",
+ absl::Substitute("$0 $1 $2 $3 $4 $5 $6 $7 $8", "a", "b", "c", "d",
+ "e", "f", "g", "h", "i"));
+ EXPECT_EQ("a b c d e f g h i j",
+ absl::Substitute("$0 $1 $2 $3 $4 $5 $6 $7 $8 $9", "a", "b", "c",
+ "d", "e", "f", "g", "h", "i", "j"));
+ EXPECT_EQ("a b c d e f g h i j b0",
+ absl::Substitute("$0 $1 $2 $3 $4 $5 $6 $7 $8 $9 $10", "a", "b", "c",
+ "d", "e", "f", "g", "h", "i", "j"));
+
+ const char* null_cstring = nullptr;
+ EXPECT_EQ("Text: ''", absl::Substitute("Text: '$0'", null_cstring));
+}
+
+TEST(SubstituteTest, SubstituteAndAppend) {
+ std::string str = "Hello";
+ absl::SubstituteAndAppend(&str, ", $0!", "world");
+ EXPECT_EQ("Hello, world!", str);
+
+ // Test all overloads.
+ str.clear();
+ absl::SubstituteAndAppend(&str, "$0", "a");
+ EXPECT_EQ("a", str);
+ str.clear();
+ absl::SubstituteAndAppend(&str, "$0 $1", "a", "b");
+ EXPECT_EQ("a b", str);
+ str.clear();
+ absl::SubstituteAndAppend(&str, "$0 $1 $2", "a", "b", "c");
+ EXPECT_EQ("a b c", str);
+ str.clear();
+ absl::SubstituteAndAppend(&str, "$0 $1 $2 $3", "a", "b", "c", "d");
+ EXPECT_EQ("a b c d", str);
+ str.clear();
+ absl::SubstituteAndAppend(&str, "$0 $1 $2 $3 $4", "a", "b", "c", "d", "e");
+ EXPECT_EQ("a b c d e", str);
+ str.clear();
+ absl::SubstituteAndAppend(&str, "$0 $1 $2 $3 $4 $5", "a", "b", "c", "d", "e",
+ "f");
+ EXPECT_EQ("a b c d e f", str);
+ str.clear();
+ absl::SubstituteAndAppend(&str, "$0 $1 $2 $3 $4 $5 $6", "a", "b", "c", "d",
+ "e", "f", "g");
+ EXPECT_EQ("a b c d e f g", str);
+ str.clear();
+ absl::SubstituteAndAppend(&str, "$0 $1 $2 $3 $4 $5 $6 $7", "a", "b", "c", "d",
+ "e", "f", "g", "h");
+ EXPECT_EQ("a b c d e f g h", str);
+ str.clear();
+ absl::SubstituteAndAppend(&str, "$0 $1 $2 $3 $4 $5 $6 $7 $8", "a", "b", "c",
+ "d", "e", "f", "g", "h", "i");
+ EXPECT_EQ("a b c d e f g h i", str);
+ str.clear();
+ absl::SubstituteAndAppend(&str, "$0 $1 $2 $3 $4 $5 $6 $7 $8 $9", "a", "b",
+ "c", "d", "e", "f", "g", "h", "i", "j");
+ EXPECT_EQ("a b c d e f g h i j", str);
+}
+
+TEST(SubstituteTest, VectorBoolRef) {
+ std::vector<bool> v = {true, false};
+ const auto& cv = v;
+ EXPECT_EQ("true false true false",
+ absl::Substitute("$0 $1 $2 $3", v[0], v[1], cv[0], cv[1]));
+
+ std::string str = "Logic be like: ";
+ absl::SubstituteAndAppend(&str, "$0 $1 $2 $3", v[0], v[1], cv[0], cv[1]);
+ EXPECT_EQ("Logic be like: true false true false", str);
+}
+
+#ifdef GTEST_HAS_DEATH_TEST
+
+TEST(SubstituteDeathTest, SubstituteDeath) {
+ EXPECT_DEBUG_DEATH(
+ static_cast<void>(absl::Substitute(absl::string_view("-$2"), "a", "b")),
+ "Invalid absl::Substitute\\(\\) format string: asked for \"\\$2\", "
+ "but only 2 args were given.");
+ EXPECT_DEBUG_DEATH(
+ static_cast<void>(absl::Substitute(absl::string_view("-$z-"))),
+ "Invalid absl::Substitute\\(\\) format string: \"-\\$z-\"");
+ EXPECT_DEBUG_DEATH(
+ static_cast<void>(absl::Substitute(absl::string_view("-$"))),
+ "Invalid absl::Substitute\\(\\) format string: \"-\\$\"");
+}
+
+#endif // GTEST_HAS_DEATH_TEST
+
+} // namespace
diff --git a/third_party/abseil/src/absl/synchronization/BUILD.bazel b/third_party/abseil/src/absl/synchronization/BUILD.bazel
new file mode 100644
index 0000000..cd4009a
--- /dev/null
+++ b/third_party/abseil/src/absl/synchronization/BUILD.bazel
@@ -0,0 +1,288 @@
+#
+# Copyright 2017 The Abseil Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+load("@rules_cc//cc:defs.bzl", "cc_binary", "cc_library", "cc_test")
+load(
+ "//absl:copts/configure_copts.bzl",
+ "ABSL_DEFAULT_COPTS",
+ "ABSL_DEFAULT_LINKOPTS",
+ "ABSL_TEST_COPTS",
+)
+
+package(default_visibility = ["//visibility:public"])
+
+licenses(["notice"])
+
+# Internal data structure for efficiently detecting mutex dependency cycles
+cc_library(
+ name = "graphcycles_internal",
+ srcs = [
+ "internal/graphcycles.cc",
+ ],
+ hdrs = [
+ "internal/graphcycles.h",
+ ],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ visibility = [
+ "//absl:__subpackages__",
+ ],
+ deps = [
+ "//absl/base",
+ "//absl/base:base_internal",
+ "//absl/base:config",
+ "//absl/base:core_headers",
+ "//absl/base:malloc_internal",
+ "//absl/base:raw_logging_internal",
+ ],
+)
+
+cc_library(
+ name = "kernel_timeout_internal",
+ hdrs = ["internal/kernel_timeout.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ visibility = [
+ "//absl/synchronization:__pkg__",
+ ],
+ deps = [
+ "//absl/base:core_headers",
+ "//absl/base:raw_logging_internal",
+ "//absl/time",
+ ],
+)
+
+cc_library(
+ name = "synchronization",
+ srcs = [
+ "barrier.cc",
+ "blocking_counter.cc",
+ "internal/create_thread_identity.cc",
+ "internal/per_thread_sem.cc",
+ "internal/waiter.cc",
+ "mutex.cc",
+ "notification.cc",
+ ],
+ hdrs = [
+ "barrier.h",
+ "blocking_counter.h",
+ "internal/create_thread_identity.h",
+ "internal/futex.h",
+ "internal/per_thread_sem.h",
+ "internal/waiter.h",
+ "mutex.h",
+ "notification.h",
+ ],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = select({
+ "//absl:windows": [],
+ "//absl:wasm": [],
+ "//conditions:default": ["-pthread"],
+ }) + ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":graphcycles_internal",
+ ":kernel_timeout_internal",
+ "//absl/base",
+ "//absl/base:atomic_hook",
+ "//absl/base:base_internal",
+ "//absl/base:config",
+ "//absl/base:core_headers",
+ "//absl/base:dynamic_annotations",
+ "//absl/base:malloc_internal",
+ "//absl/base:raw_logging_internal",
+ "//absl/debugging:stacktrace",
+ "//absl/debugging:symbolize",
+ "//absl/time",
+ ],
+)
+
+cc_test(
+ name = "barrier_test",
+ size = "small",
+ srcs = ["barrier_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":synchronization",
+ "//absl/time",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "blocking_counter_test",
+ size = "small",
+ srcs = ["blocking_counter_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":synchronization",
+ "//absl/time",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "graphcycles_test",
+ size = "medium",
+ srcs = ["internal/graphcycles_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":graphcycles_internal",
+ "//absl/base:core_headers",
+ "//absl/base:raw_logging_internal",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "graphcycles_benchmark",
+ srcs = ["internal/graphcycles_benchmark.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ tags = [
+ "benchmark",
+ ],
+ deps = [
+ ":graphcycles_internal",
+ "//absl/base:raw_logging_internal",
+ "@com_github_google_benchmark//:benchmark_main",
+ ],
+)
+
+cc_library(
+ name = "thread_pool",
+ testonly = 1,
+ hdrs = ["internal/thread_pool.h"],
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ visibility = [
+ "//absl:__subpackages__",
+ ],
+ deps = [
+ ":synchronization",
+ "//absl/base:core_headers",
+ ],
+)
+
+cc_test(
+ name = "mutex_test",
+ size = "large",
+ srcs = ["mutex_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ shard_count = 25,
+ deps = [
+ ":synchronization",
+ ":thread_pool",
+ "//absl/base",
+ "//absl/base:config",
+ "//absl/base:core_headers",
+ "//absl/base:raw_logging_internal",
+ "//absl/memory",
+ "//absl/time",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_library(
+ name = "mutex_benchmark_common",
+ testonly = 1,
+ srcs = ["mutex_benchmark.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ visibility = [
+ "//absl/synchronization:__pkg__",
+ ],
+ deps = [
+ ":synchronization",
+ ":thread_pool",
+ "//absl/base",
+ "//absl/base:config",
+ "@com_github_google_benchmark//:benchmark_main",
+ ],
+ alwayslink = 1,
+)
+
+cc_binary(
+ name = "mutex_benchmark",
+ testonly = 1,
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ visibility = ["//visibility:private"],
+ deps = [
+ ":mutex_benchmark_common",
+ ],
+)
+
+cc_test(
+ name = "notification_test",
+ size = "small",
+ srcs = ["notification_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":synchronization",
+ "//absl/time",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_library(
+ name = "per_thread_sem_test_common",
+ testonly = 1,
+ srcs = ["internal/per_thread_sem_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":synchronization",
+ "//absl/base",
+ "//absl/base:config",
+ "//absl/strings",
+ "//absl/time",
+ "@com_google_googletest//:gtest",
+ ],
+ alwayslink = 1,
+)
+
+cc_test(
+ name = "per_thread_sem_test",
+ size = "medium",
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":per_thread_sem_test_common",
+ ":synchronization",
+ "//absl/strings",
+ "//absl/time",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "lifetime_test",
+ srcs = [
+ "lifetime_test.cc",
+ ],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ tags = ["no_test_ios_x86_64"],
+ deps = [
+ ":synchronization",
+ "//absl/base:core_headers",
+ "//absl/base:raw_logging_internal",
+ ],
+)
diff --git a/third_party/abseil/src/absl/synchronization/CMakeLists.txt b/third_party/abseil/src/absl/synchronization/CMakeLists.txt
new file mode 100644
index 0000000..e633d0b
--- /dev/null
+++ b/third_party/abseil/src/absl/synchronization/CMakeLists.txt
@@ -0,0 +1,216 @@
+#
+# Copyright 2017 The Abseil Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+absl_cc_library(
+ NAME
+ graphcycles_internal
+ HDRS
+ "internal/graphcycles.h"
+ SRCS
+ "internal/graphcycles.cc"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::base
+ absl::base_internal
+ absl::config
+ absl::core_headers
+ absl::malloc_internal
+ absl::raw_logging_internal
+)
+
+absl_cc_library(
+ NAME
+ kernel_timeout_internal
+ HDRS
+ "internal/kernel_timeout.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::core_headers
+ absl::raw_logging_internal
+ absl::time
+)
+
+absl_cc_library(
+ NAME
+ synchronization
+ HDRS
+ "barrier.h"
+ "blocking_counter.h"
+ "internal/create_thread_identity.h"
+ "internal/futex.h"
+ "internal/per_thread_sem.h"
+ "internal/waiter.h"
+ "mutex.h"
+ "notification.h"
+ SRCS
+ "barrier.cc"
+ "blocking_counter.cc"
+ "internal/create_thread_identity.cc"
+ "internal/per_thread_sem.cc"
+ "internal/waiter.cc"
+ "notification.cc"
+ "mutex.cc"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::graphcycles_internal
+ absl::kernel_timeout_internal
+ absl::atomic_hook
+ absl::base
+ absl::base_internal
+ absl::config
+ absl::core_headers
+ absl::dynamic_annotations
+ absl::malloc_internal
+ absl::raw_logging_internal
+ absl::stacktrace
+ absl::symbolize
+ absl::time
+ Threads::Threads
+ PUBLIC
+)
+
+absl_cc_test(
+ NAME
+ barrier_test
+ SRCS
+ "barrier_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::synchronization
+ absl::time
+ gmock_main
+)
+
+absl_cc_test(
+ NAME
+ blocking_counter_test
+ SRCS
+ "blocking_counter_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::synchronization
+ absl::time
+ gmock_main
+)
+
+absl_cc_test(
+ NAME
+ graphcycles_test
+ SRCS
+ "internal/graphcycles_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::graphcycles_internal
+ absl::core_headers
+ absl::raw_logging_internal
+ gmock_main
+)
+
+absl_cc_library(
+ NAME
+ thread_pool
+ HDRS
+ "internal/thread_pool.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::synchronization
+ absl::core_headers
+ TESTONLY
+)
+
+absl_cc_test(
+ NAME
+ mutex_test
+ SRCS
+ "mutex_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::synchronization
+ absl::thread_pool
+ absl::base
+ absl::config
+ absl::core_headers
+ absl::memory
+ absl::raw_logging_internal
+ absl::time
+ gmock_main
+)
+
+absl_cc_test(
+ NAME
+ notification_test
+ SRCS
+ "notification_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::synchronization
+ absl::time
+ gmock_main
+)
+
+absl_cc_library(
+ NAME
+ per_thread_sem_test_common
+ SRCS
+ "internal/per_thread_sem_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::synchronization
+ absl::base
+ absl::config
+ absl::strings
+ absl::time
+ gmock
+ TESTONLY
+)
+
+absl_cc_test(
+ NAME
+ per_thread_sem_test
+ SRCS
+ "internal/per_thread_sem_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::per_thread_sem_test_common
+ absl::synchronization
+ absl::strings
+ absl::time
+ gmock_main
+)
+
+absl_cc_test(
+ NAME
+ lifetime_test
+ SRCS
+ "lifetime_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::synchronization
+ absl::core_headers
+ absl::raw_logging_internal
+)
diff --git a/third_party/abseil/src/absl/synchronization/barrier.cc b/third_party/abseil/src/absl/synchronization/barrier.cc
new file mode 100644
index 0000000..0dfd795
--- /dev/null
+++ b/third_party/abseil/src/absl/synchronization/barrier.cc
@@ -0,0 +1,52 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/synchronization/barrier.h"
+
+#include "absl/base/internal/raw_logging.h"
+#include "absl/synchronization/mutex.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+// Return whether int *arg is zero.
+static bool IsZero(void *arg) {
+ return 0 == *reinterpret_cast<int *>(arg);
+}
+
+bool Barrier::Block() {
+ MutexLock l(&this->lock_);
+
+ this->num_to_block_--;
+ if (this->num_to_block_ < 0) {
+ ABSL_RAW_LOG(
+ FATAL,
+ "Block() called too many times. num_to_block_=%d out of total=%d",
+ this->num_to_block_, this->num_to_exit_);
+ }
+
+ this->lock_.Await(Condition(IsZero, &this->num_to_block_));
+
+ // Determine which thread can safely delete this Barrier object
+ this->num_to_exit_--;
+ ABSL_RAW_CHECK(this->num_to_exit_ >= 0, "barrier underflow");
+
+ // If num_to_exit_ == 0 then all other threads in the barrier have
+ // exited the Wait() and have released the Mutex so this thread is
+ // free to delete the barrier.
+ return this->num_to_exit_ == 0;
+}
+
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/synchronization/barrier.h b/third_party/abseil/src/absl/synchronization/barrier.h
new file mode 100644
index 0000000..d8e7544
--- /dev/null
+++ b/third_party/abseil/src/absl/synchronization/barrier.h
@@ -0,0 +1,79 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// barrier.h
+// -----------------------------------------------------------------------------
+
+#ifndef ABSL_SYNCHRONIZATION_BARRIER_H_
+#define ABSL_SYNCHRONIZATION_BARRIER_H_
+
+#include "absl/base/thread_annotations.h"
+#include "absl/synchronization/mutex.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+// Barrier
+//
+// This class creates a barrier which blocks threads until a prespecified
+// threshold of threads (`num_threads`) utilizes the barrier. A thread utilizes
+// the `Barrier` by calling `Block()` on the barrier, which will block that
+// thread; no call to `Block()` will return until `num_threads` threads have
+// called it.
+//
+// Exactly one call to `Block()` will return `true`, which is then responsible
+// for destroying the barrier; because stack allocation will cause the barrier
+// to be deleted when it is out of scope, barriers should not be stack
+// allocated.
+//
+// Example:
+//
+// // Main thread creates a `Barrier`:
+// barrier = new Barrier(num_threads);
+//
+// // Each participating thread could then call:
+// if (barrier->Block()) delete barrier; // Exactly one call to `Block()`
+// // returns `true`; that call
+// // deletes the barrier.
+class Barrier {
+ public:
+ // `num_threads` is the number of threads that will participate in the barrier
+ explicit Barrier(int num_threads)
+ : num_to_block_(num_threads), num_to_exit_(num_threads) {}
+
+ Barrier(const Barrier&) = delete;
+ Barrier& operator=(const Barrier&) = delete;
+
+ // Barrier::Block()
+ //
+ // Blocks the current thread, and returns only when the `num_threads`
+ // threshold of threads utilizing this barrier has been reached. `Block()`
+ // returns `true` for precisely one caller, which may then destroy the
+ // barrier.
+ //
+ // Memory ordering: For any threads X and Y, any action taken by X
+ // before X calls `Block()` will be visible to Y after Y returns from
+ // `Block()`.
+ bool Block();
+
+ private:
+ Mutex lock_;
+ int num_to_block_ ABSL_GUARDED_BY(lock_);
+ int num_to_exit_ ABSL_GUARDED_BY(lock_);
+};
+
+ABSL_NAMESPACE_END
+} // namespace absl
+#endif // ABSL_SYNCHRONIZATION_BARRIER_H_
diff --git a/third_party/abseil/src/absl/synchronization/barrier_test.cc b/third_party/abseil/src/absl/synchronization/barrier_test.cc
new file mode 100644
index 0000000..bfc6cb1
--- /dev/null
+++ b/third_party/abseil/src/absl/synchronization/barrier_test.cc
@@ -0,0 +1,75 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/synchronization/barrier.h"
+
+#include <thread> // NOLINT(build/c++11)
+#include <vector>
+
+#include "gtest/gtest.h"
+#include "absl/synchronization/mutex.h"
+#include "absl/time/clock.h"
+
+
+TEST(Barrier, SanityTest) {
+ constexpr int kNumThreads = 10;
+ absl::Barrier* barrier = new absl::Barrier(kNumThreads);
+
+ absl::Mutex mutex;
+ int counter = 0; // Guarded by mutex.
+
+ auto thread_func = [&] {
+ if (barrier->Block()) {
+ // This thread is the last thread to reach the barrier so it is
+ // responsible for deleting it.
+ delete barrier;
+ }
+
+ // Increment the counter.
+ absl::MutexLock lock(&mutex);
+ ++counter;
+ };
+
+ // Start (kNumThreads - 1) threads running thread_func.
+ std::vector<std::thread> threads;
+ for (int i = 0; i < kNumThreads - 1; ++i) {
+ threads.push_back(std::thread(thread_func));
+ }
+
+ // Give (kNumThreads - 1) threads a chance to reach the barrier.
+ // This test assumes at least one thread will have run after the
+ // sleep has elapsed. Sleeping in a test is usually bad form, but we
+ // need to make sure that we are testing the barrier instead of some
+ // other synchronization method.
+ absl::SleepFor(absl::Seconds(1));
+
+ // The counter should still be zero since no thread should have
+ // been able to pass the barrier yet.
+ {
+ absl::MutexLock lock(&mutex);
+ EXPECT_EQ(counter, 0);
+ }
+
+ // Start 1 more thread. This should make all threads pass the barrier.
+ threads.push_back(std::thread(thread_func));
+
+ // All threads should now be able to proceed and finish.
+ for (auto& thread : threads) {
+ thread.join();
+ }
+
+ // All threads should now have incremented the counter.
+ absl::MutexLock lock(&mutex);
+ EXPECT_EQ(counter, kNumThreads);
+}
diff --git a/third_party/abseil/src/absl/synchronization/blocking_counter.cc b/third_party/abseil/src/absl/synchronization/blocking_counter.cc
new file mode 100644
index 0000000..3cea7ae
--- /dev/null
+++ b/third_party/abseil/src/absl/synchronization/blocking_counter.cc
@@ -0,0 +1,57 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/synchronization/blocking_counter.h"
+
+#include "absl/base/internal/raw_logging.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+// Return whether int *arg is zero.
+static bool IsZero(void *arg) {
+ return 0 == *reinterpret_cast<int *>(arg);
+}
+
+bool BlockingCounter::DecrementCount() {
+ MutexLock l(&lock_);
+ count_--;
+ if (count_ < 0) {
+ ABSL_RAW_LOG(
+ FATAL,
+ "BlockingCounter::DecrementCount() called too many times. count=%d",
+ count_);
+ }
+ return count_ == 0;
+}
+
+void BlockingCounter::Wait() {
+ MutexLock l(&this->lock_);
+ ABSL_RAW_CHECK(count_ >= 0, "BlockingCounter underflow");
+
+ // only one thread may call Wait(). To support more than one thread,
+ // implement a counter num_to_exit, like in the Barrier class.
+ ABSL_RAW_CHECK(num_waiting_ == 0, "multiple threads called Wait()");
+ num_waiting_++;
+
+ this->lock_.Await(Condition(IsZero, &this->count_));
+
+ // At this point, We know that all threads executing DecrementCount have
+ // released the lock, and so will not touch this object again.
+ // Therefore, the thread calling this method is free to delete the object
+ // after we return from this method.
+}
+
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/synchronization/blocking_counter.h b/third_party/abseil/src/absl/synchronization/blocking_counter.h
new file mode 100644
index 0000000..1f53f9f
--- /dev/null
+++ b/third_party/abseil/src/absl/synchronization/blocking_counter.h
@@ -0,0 +1,99 @@
+//
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// blocking_counter.h
+// -----------------------------------------------------------------------------
+
+#ifndef ABSL_SYNCHRONIZATION_BLOCKING_COUNTER_H_
+#define ABSL_SYNCHRONIZATION_BLOCKING_COUNTER_H_
+
+#include "absl/base/thread_annotations.h"
+#include "absl/synchronization/mutex.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+// BlockingCounter
+//
+// This class allows a thread to block for a pre-specified number of actions.
+// `BlockingCounter` maintains a single non-negative abstract integer "count"
+// with an initial value `initial_count`. A thread can then call `Wait()` on
+// this blocking counter to block until the specified number of events occur;
+// worker threads then call 'DecrementCount()` on the counter upon completion of
+// their work. Once the counter's internal "count" reaches zero, the blocked
+// thread unblocks.
+//
+// A `BlockingCounter` requires the following:
+// - its `initial_count` is non-negative.
+// - the number of calls to `DecrementCount()` on it is at most
+// `initial_count`.
+// - `Wait()` is called at most once on it.
+//
+// Given the above requirements, a `BlockingCounter` provides the following
+// guarantees:
+// - Once its internal "count" reaches zero, no legal action on the object
+// can further change the value of "count".
+// - When `Wait()` returns, it is legal to destroy the `BlockingCounter`.
+// - When `Wait()` returns, the number of calls to `DecrementCount()` on
+// this blocking counter exactly equals `initial_count`.
+//
+// Example:
+// BlockingCounter bcount(N); // there are N items of work
+// ... Allow worker threads to start.
+// ... On completing each work item, workers do:
+// ... bcount.DecrementCount(); // an item of work has been completed
+//
+// bcount.Wait(); // wait for all work to be complete
+//
+class BlockingCounter {
+ public:
+ explicit BlockingCounter(int initial_count)
+ : count_(initial_count), num_waiting_(0) {}
+
+ BlockingCounter(const BlockingCounter&) = delete;
+ BlockingCounter& operator=(const BlockingCounter&) = delete;
+
+ // BlockingCounter::DecrementCount()
+ //
+ // Decrements the counter's "count" by one, and return "count == 0". This
+ // function requires that "count != 0" when it is called.
+ //
+ // Memory ordering: For any threads X and Y, any action taken by X
+ // before it calls `DecrementCount()` is visible to thread Y after
+ // Y's call to `DecrementCount()`, provided Y's call returns `true`.
+ bool DecrementCount();
+
+ // BlockingCounter::Wait()
+ //
+ // Blocks until the counter reaches zero. This function may be called at most
+ // once. On return, `DecrementCount()` will have been called "initial_count"
+ // times and the blocking counter may be destroyed.
+ //
+ // Memory ordering: For any threads X and Y, any action taken by X
+ // before X calls `DecrementCount()` is visible to Y after Y returns
+ // from `Wait()`.
+ void Wait();
+
+ private:
+ Mutex lock_;
+ int count_ ABSL_GUARDED_BY(lock_);
+ int num_waiting_ ABSL_GUARDED_BY(lock_);
+};
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_SYNCHRONIZATION_BLOCKING_COUNTER_H_
diff --git a/third_party/abseil/src/absl/synchronization/blocking_counter_test.cc b/third_party/abseil/src/absl/synchronization/blocking_counter_test.cc
new file mode 100644
index 0000000..2926224
--- /dev/null
+++ b/third_party/abseil/src/absl/synchronization/blocking_counter_test.cc
@@ -0,0 +1,68 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/synchronization/blocking_counter.h"
+
+#include <thread> // NOLINT(build/c++11)
+#include <vector>
+
+#include "gtest/gtest.h"
+#include "absl/time/clock.h"
+#include "absl/time/time.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace {
+
+void PauseAndDecreaseCounter(BlockingCounter* counter, int* done) {
+ absl::SleepFor(absl::Seconds(1));
+ *done = 1;
+ counter->DecrementCount();
+}
+
+TEST(BlockingCounterTest, BasicFunctionality) {
+ // This test verifies that BlockingCounter functions correctly. Starts a
+ // number of threads that just sleep for a second and decrement a counter.
+
+ // Initialize the counter.
+ const int num_workers = 10;
+ BlockingCounter counter(num_workers);
+
+ std::vector<std::thread> workers;
+ std::vector<int> done(num_workers, 0);
+
+ // Start a number of parallel tasks that will just wait for a seconds and
+ // then decrement the count.
+ workers.reserve(num_workers);
+ for (int k = 0; k < num_workers; k++) {
+ workers.emplace_back(
+ [&counter, &done, k] { PauseAndDecreaseCounter(&counter, &done[k]); });
+ }
+
+ // Wait for the threads to have all finished.
+ counter.Wait();
+
+ // Check that all the workers have completed.
+ for (int k = 0; k < num_workers; k++) {
+ EXPECT_EQ(1, done[k]);
+ }
+
+ for (std::thread& w : workers) {
+ w.join();
+ }
+}
+
+} // namespace
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/synchronization/internal/create_thread_identity.cc b/third_party/abseil/src/absl/synchronization/internal/create_thread_identity.cc
new file mode 100644
index 0000000..53a71b3
--- /dev/null
+++ b/third_party/abseil/src/absl/synchronization/internal/create_thread_identity.cc
@@ -0,0 +1,140 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <stdint.h>
+#include <new>
+
+// This file is a no-op if the required LowLevelAlloc support is missing.
+#include "absl/base/internal/low_level_alloc.h"
+#ifndef ABSL_LOW_LEVEL_ALLOC_MISSING
+
+#include <string.h>
+
+#include "absl/base/attributes.h"
+#include "absl/base/internal/spinlock.h"
+#include "absl/base/internal/thread_identity.h"
+#include "absl/synchronization/internal/per_thread_sem.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace synchronization_internal {
+
+// ThreadIdentity storage is persistent, we maintain a free-list of previously
+// released ThreadIdentity objects.
+ABSL_CONST_INIT static base_internal::SpinLock freelist_lock(
+ absl::kConstInit, base_internal::SCHEDULE_KERNEL_ONLY);
+ABSL_CONST_INIT static base_internal::ThreadIdentity* thread_identity_freelist;
+
+// A per-thread destructor for reclaiming associated ThreadIdentity objects.
+// Since we must preserve their storage we cache them for re-use.
+void ReclaimThreadIdentity(void* v) {
+ base_internal::ThreadIdentity* identity =
+ static_cast<base_internal::ThreadIdentity*>(v);
+
+ // all_locks might have been allocated by the Mutex implementation.
+ // We free it here when we are notified that our thread is dying.
+ if (identity->per_thread_synch.all_locks != nullptr) {
+ base_internal::LowLevelAlloc::Free(identity->per_thread_synch.all_locks);
+ }
+
+ PerThreadSem::Destroy(identity);
+
+ // We must explicitly clear the current thread's identity:
+ // (a) Subsequent (unrelated) per-thread destructors may require an identity.
+ // We must guarantee a new identity is used in this case (this instructor
+ // will be reinvoked up to PTHREAD_DESTRUCTOR_ITERATIONS in this case).
+ // (b) ThreadIdentity implementations may depend on memory that is not
+ // reinitialized before reuse. We must allow explicit clearing of the
+ // association state in this case.
+ base_internal::ClearCurrentThreadIdentity();
+ {
+ base_internal::SpinLockHolder l(&freelist_lock);
+ identity->next = thread_identity_freelist;
+ thread_identity_freelist = identity;
+ }
+}
+
+// Return value rounded up to next multiple of align.
+// Align must be a power of two.
+static intptr_t RoundUp(intptr_t addr, intptr_t align) {
+ return (addr + align - 1) & ~(align - 1);
+}
+
+static void ResetThreadIdentity(base_internal::ThreadIdentity* identity) {
+ base_internal::PerThreadSynch* pts = &identity->per_thread_synch;
+ pts->next = nullptr;
+ pts->skip = nullptr;
+ pts->may_skip = false;
+ pts->waitp = nullptr;
+ pts->suppress_fatal_errors = false;
+ pts->readers = 0;
+ pts->priority = 0;
+ pts->next_priority_read_cycles = 0;
+ pts->state.store(base_internal::PerThreadSynch::State::kAvailable,
+ std::memory_order_relaxed);
+ pts->maybe_unlocking = false;
+ pts->wake = false;
+ pts->cond_waiter = false;
+ pts->all_locks = nullptr;
+ identity->blocked_count_ptr = nullptr;
+ identity->ticker.store(0, std::memory_order_relaxed);
+ identity->wait_start.store(0, std::memory_order_relaxed);
+ identity->is_idle.store(false, std::memory_order_relaxed);
+ identity->next = nullptr;
+}
+
+static base_internal::ThreadIdentity* NewThreadIdentity() {
+ base_internal::ThreadIdentity* identity = nullptr;
+
+ {
+ // Re-use a previously released object if possible.
+ base_internal::SpinLockHolder l(&freelist_lock);
+ if (thread_identity_freelist) {
+ identity = thread_identity_freelist; // Take list-head.
+ thread_identity_freelist = thread_identity_freelist->next;
+ }
+ }
+
+ if (identity == nullptr) {
+ // Allocate enough space to align ThreadIdentity to a multiple of
+ // PerThreadSynch::kAlignment. This space is never released (it is
+ // added to a freelist by ReclaimThreadIdentity instead).
+ void* allocation = base_internal::LowLevelAlloc::Alloc(
+ sizeof(*identity) + base_internal::PerThreadSynch::kAlignment - 1);
+ // Round up the address to the required alignment.
+ identity = reinterpret_cast<base_internal::ThreadIdentity*>(
+ RoundUp(reinterpret_cast<intptr_t>(allocation),
+ base_internal::PerThreadSynch::kAlignment));
+ }
+ ResetThreadIdentity(identity);
+
+ return identity;
+}
+
+// Allocates and attaches ThreadIdentity object for the calling thread. Returns
+// the new identity.
+// REQUIRES: CurrentThreadIdentity(false) == nullptr
+base_internal::ThreadIdentity* CreateThreadIdentity() {
+ base_internal::ThreadIdentity* identity = NewThreadIdentity();
+ PerThreadSem::Init(identity);
+ // Associate the value with the current thread, and attach our destructor.
+ base_internal::SetCurrentThreadIdentity(identity, ReclaimThreadIdentity);
+ return identity;
+}
+
+} // namespace synchronization_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_LOW_LEVEL_ALLOC_MISSING
diff --git a/third_party/abseil/src/absl/synchronization/internal/create_thread_identity.h b/third_party/abseil/src/absl/synchronization/internal/create_thread_identity.h
new file mode 100644
index 0000000..e121f68
--- /dev/null
+++ b/third_party/abseil/src/absl/synchronization/internal/create_thread_identity.h
@@ -0,0 +1,60 @@
+/*
+ * Copyright 2017 The Abseil Authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// Interface for getting the current ThreadIdentity, creating one if necessary.
+// See thread_identity.h.
+//
+// This file is separate from thread_identity.h because creating a new
+// ThreadIdentity requires slightly higher level libraries (per_thread_sem
+// and low_level_alloc) than accessing an existing one. This separation allows
+// us to have a smaller //absl/base:base.
+
+#ifndef ABSL_SYNCHRONIZATION_INTERNAL_CREATE_THREAD_IDENTITY_H_
+#define ABSL_SYNCHRONIZATION_INTERNAL_CREATE_THREAD_IDENTITY_H_
+
+#include "absl/base/internal/thread_identity.h"
+#include "absl/base/port.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace synchronization_internal {
+
+// Allocates and attaches a ThreadIdentity object for the calling thread.
+// For private use only.
+base_internal::ThreadIdentity* CreateThreadIdentity();
+
+// A per-thread destructor for reclaiming associated ThreadIdentity objects.
+// For private use only.
+void ReclaimThreadIdentity(void* v);
+
+// Returns the ThreadIdentity object representing the calling thread; guaranteed
+// to be unique for its lifetime. The returned object will remain valid for the
+// program's lifetime; although it may be re-assigned to a subsequent thread.
+// If one does not exist for the calling thread, allocate it now.
+inline base_internal::ThreadIdentity* GetOrCreateCurrentThreadIdentity() {
+ base_internal::ThreadIdentity* identity =
+ base_internal::CurrentThreadIdentityIfPresent();
+ if (ABSL_PREDICT_FALSE(identity == nullptr)) {
+ return CreateThreadIdentity();
+ }
+ return identity;
+}
+
+} // namespace synchronization_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_SYNCHRONIZATION_INTERNAL_CREATE_THREAD_IDENTITY_H_
diff --git a/third_party/abseil/src/absl/synchronization/internal/futex.h b/third_party/abseil/src/absl/synchronization/internal/futex.h
new file mode 100644
index 0000000..06fbd6d
--- /dev/null
+++ b/third_party/abseil/src/absl/synchronization/internal/futex.h
@@ -0,0 +1,154 @@
+// Copyright 2020 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+#ifndef ABSL_SYNCHRONIZATION_INTERNAL_FUTEX_H_
+#define ABSL_SYNCHRONIZATION_INTERNAL_FUTEX_H_
+
+#include "absl/base/config.h"
+
+#ifdef _WIN32
+#include <windows.h>
+#else
+#include <sys/time.h>
+#include <unistd.h>
+#endif
+
+#ifdef __linux__
+#include <linux/futex.h>
+#include <sys/syscall.h>
+#endif
+
+#include <errno.h>
+#include <stdio.h>
+#include <time.h>
+
+#include <atomic>
+#include <cstdint>
+
+#include "absl/base/optimization.h"
+#include "absl/synchronization/internal/kernel_timeout.h"
+
+#ifdef ABSL_INTERNAL_HAVE_FUTEX
+#error ABSL_INTERNAL_HAVE_FUTEX may not be set on the command line
+#elif defined(__BIONIC__)
+// Bionic supports all the futex operations we need even when some of the futex
+// definitions are missing.
+#define ABSL_INTERNAL_HAVE_FUTEX
+#elif defined(__linux__) && defined(FUTEX_CLOCK_REALTIME)
+// FUTEX_CLOCK_REALTIME requires Linux >= 2.6.28.
+#define ABSL_INTERNAL_HAVE_FUTEX
+#endif
+
+#ifdef ABSL_INTERNAL_HAVE_FUTEX
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace synchronization_internal {
+
+// Some Android headers are missing these definitions even though they
+// support these futex operations.
+#ifdef __BIONIC__
+#ifndef SYS_futex
+#define SYS_futex __NR_futex
+#endif
+#ifndef FUTEX_WAIT_BITSET
+#define FUTEX_WAIT_BITSET 9
+#endif
+#ifndef FUTEX_PRIVATE_FLAG
+#define FUTEX_PRIVATE_FLAG 128
+#endif
+#ifndef FUTEX_CLOCK_REALTIME
+#define FUTEX_CLOCK_REALTIME 256
+#endif
+#ifndef FUTEX_BITSET_MATCH_ANY
+#define FUTEX_BITSET_MATCH_ANY 0xFFFFFFFF
+#endif
+#endif
+
+#if defined(__NR_futex_time64) && !defined(SYS_futex_time64)
+#define SYS_futex_time64 __NR_futex_time64
+#endif
+
+#if defined(SYS_futex_time64) && !defined(SYS_futex)
+#define SYS_futex SYS_futex_time64
+#endif
+
+class FutexImpl {
+ public:
+ static int WaitUntil(std::atomic<int32_t> *v, int32_t val,
+ KernelTimeout t) {
+ int err = 0;
+ if (t.has_timeout()) {
+ // https://locklessinc.com/articles/futex_cheat_sheet/
+ // Unlike FUTEX_WAIT, FUTEX_WAIT_BITSET uses absolute time.
+ struct timespec abs_timeout = t.MakeAbsTimespec();
+ // Atomically check that the futex value is still 0, and if it
+ // is, sleep until abs_timeout or until woken by FUTEX_WAKE.
+ err = syscall(
+ SYS_futex, reinterpret_cast<int32_t *>(v),
+ FUTEX_WAIT_BITSET | FUTEX_PRIVATE_FLAG | FUTEX_CLOCK_REALTIME, val,
+ &abs_timeout, nullptr, FUTEX_BITSET_MATCH_ANY);
+ } else {
+ // Atomically check that the futex value is still 0, and if it
+ // is, sleep until woken by FUTEX_WAKE.
+ err = syscall(SYS_futex, reinterpret_cast<int32_t *>(v),
+ FUTEX_WAIT | FUTEX_PRIVATE_FLAG, val, nullptr);
+ }
+ if (ABSL_PREDICT_FALSE(err != 0)) {
+ err = -errno;
+ }
+ return err;
+ }
+
+ static int WaitBitsetAbsoluteTimeout(std::atomic<int32_t> *v, int32_t val,
+ int32_t bits,
+ const struct timespec *abstime) {
+ int err = syscall(SYS_futex, reinterpret_cast<int32_t *>(v),
+ FUTEX_WAIT_BITSET | FUTEX_PRIVATE_FLAG, val, abstime,
+ nullptr, bits);
+ if (ABSL_PREDICT_FALSE(err != 0)) {
+ err = -errno;
+ }
+ return err;
+ }
+
+ static int Wake(std::atomic<int32_t> *v, int32_t count) {
+ int err = syscall(SYS_futex, reinterpret_cast<int32_t *>(v),
+ FUTEX_WAKE | FUTEX_PRIVATE_FLAG, count);
+ if (ABSL_PREDICT_FALSE(err < 0)) {
+ err = -errno;
+ }
+ return err;
+ }
+
+ // FUTEX_WAKE_BITSET
+ static int WakeBitset(std::atomic<int32_t> *v, int32_t count, int32_t bits) {
+ int err = syscall(SYS_futex, reinterpret_cast<int32_t *>(v),
+ FUTEX_WAKE_BITSET | FUTEX_PRIVATE_FLAG, count, nullptr,
+ nullptr, bits);
+ if (ABSL_PREDICT_FALSE(err < 0)) {
+ err = -errno;
+ }
+ return err;
+ }
+};
+
+class Futex : public FutexImpl {};
+
+} // namespace synchronization_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_INTERNAL_HAVE_FUTEX
+
+#endif // ABSL_SYNCHRONIZATION_INTERNAL_FUTEX_H_
diff --git a/third_party/abseil/src/absl/synchronization/internal/graphcycles.cc b/third_party/abseil/src/absl/synchronization/internal/graphcycles.cc
new file mode 100644
index 0000000..27fec21
--- /dev/null
+++ b/third_party/abseil/src/absl/synchronization/internal/graphcycles.cc
@@ -0,0 +1,698 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// GraphCycles provides incremental cycle detection on a dynamic
+// graph using the following algorithm:
+//
+// A dynamic topological sort algorithm for directed acyclic graphs
+// David J. Pearce, Paul H. J. Kelly
+// Journal of Experimental Algorithmics (JEA) JEA Homepage archive
+// Volume 11, 2006, Article No. 1.7
+//
+// Brief summary of the algorithm:
+//
+// (1) Maintain a rank for each node that is consistent
+// with the topological sort of the graph. I.e., path from x to y
+// implies rank[x] < rank[y].
+// (2) When a new edge (x->y) is inserted, do nothing if rank[x] < rank[y].
+// (3) Otherwise: adjust ranks in the neighborhood of x and y.
+
+#include "absl/base/attributes.h"
+// This file is a no-op if the required LowLevelAlloc support is missing.
+#include "absl/base/internal/low_level_alloc.h"
+#ifndef ABSL_LOW_LEVEL_ALLOC_MISSING
+
+#include "absl/synchronization/internal/graphcycles.h"
+
+#include <algorithm>
+#include <array>
+#include <limits>
+#include "absl/base/internal/hide_ptr.h"
+#include "absl/base/internal/raw_logging.h"
+#include "absl/base/internal/spinlock.h"
+
+// Do not use STL. This module does not use standard memory allocation.
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace synchronization_internal {
+
+namespace {
+
+// Avoid LowLevelAlloc's default arena since it calls malloc hooks in
+// which people are doing things like acquiring Mutexes.
+ABSL_CONST_INIT static absl::base_internal::SpinLock arena_mu(
+ absl::kConstInit, base_internal::SCHEDULE_KERNEL_ONLY);
+ABSL_CONST_INIT static base_internal::LowLevelAlloc::Arena* arena;
+
+static void InitArenaIfNecessary() {
+ arena_mu.Lock();
+ if (arena == nullptr) {
+ arena = base_internal::LowLevelAlloc::NewArena(0);
+ }
+ arena_mu.Unlock();
+}
+
+// Number of inlined elements in Vec. Hash table implementation
+// relies on this being a power of two.
+static const uint32_t kInline = 8;
+
+// A simple LowLevelAlloc based resizable vector with inlined storage
+// for a few elements. T must be a plain type since constructor
+// and destructor are not run on elements of type T managed by Vec.
+template <typename T>
+class Vec {
+ public:
+ Vec() { Init(); }
+ ~Vec() { Discard(); }
+
+ void clear() {
+ Discard();
+ Init();
+ }
+
+ bool empty() const { return size_ == 0; }
+ uint32_t size() const { return size_; }
+ T* begin() { return ptr_; }
+ T* end() { return ptr_ + size_; }
+ const T& operator[](uint32_t i) const { return ptr_[i]; }
+ T& operator[](uint32_t i) { return ptr_[i]; }
+ const T& back() const { return ptr_[size_-1]; }
+ void pop_back() { size_--; }
+
+ void push_back(const T& v) {
+ if (size_ == capacity_) Grow(size_ + 1);
+ ptr_[size_] = v;
+ size_++;
+ }
+
+ void resize(uint32_t n) {
+ if (n > capacity_) Grow(n);
+ size_ = n;
+ }
+
+ void fill(const T& val) {
+ for (uint32_t i = 0; i < size(); i++) {
+ ptr_[i] = val;
+ }
+ }
+
+ // Guarantees src is empty at end.
+ // Provided for the hash table resizing code below.
+ void MoveFrom(Vec<T>* src) {
+ if (src->ptr_ == src->space_) {
+ // Need to actually copy
+ resize(src->size_);
+ std::copy(src->ptr_, src->ptr_ + src->size_, ptr_);
+ src->size_ = 0;
+ } else {
+ Discard();
+ ptr_ = src->ptr_;
+ size_ = src->size_;
+ capacity_ = src->capacity_;
+ src->Init();
+ }
+ }
+
+ private:
+ T* ptr_;
+ T space_[kInline];
+ uint32_t size_;
+ uint32_t capacity_;
+
+ void Init() {
+ ptr_ = space_;
+ size_ = 0;
+ capacity_ = kInline;
+ }
+
+ void Discard() {
+ if (ptr_ != space_) base_internal::LowLevelAlloc::Free(ptr_);
+ }
+
+ void Grow(uint32_t n) {
+ while (capacity_ < n) {
+ capacity_ *= 2;
+ }
+ size_t request = static_cast<size_t>(capacity_) * sizeof(T);
+ T* copy = static_cast<T*>(
+ base_internal::LowLevelAlloc::AllocWithArena(request, arena));
+ std::copy(ptr_, ptr_ + size_, copy);
+ Discard();
+ ptr_ = copy;
+ }
+
+ Vec(const Vec&) = delete;
+ Vec& operator=(const Vec&) = delete;
+};
+
+// A hash set of non-negative int32_t that uses Vec for its underlying storage.
+class NodeSet {
+ public:
+ NodeSet() { Init(); }
+
+ void clear() { Init(); }
+ bool contains(int32_t v) const { return table_[FindIndex(v)] == v; }
+
+ bool insert(int32_t v) {
+ uint32_t i = FindIndex(v);
+ if (table_[i] == v) {
+ return false;
+ }
+ if (table_[i] == kEmpty) {
+ // Only inserting over an empty cell increases the number of occupied
+ // slots.
+ occupied_++;
+ }
+ table_[i] = v;
+ // Double when 75% full.
+ if (occupied_ >= table_.size() - table_.size()/4) Grow();
+ return true;
+ }
+
+ void erase(uint32_t v) {
+ uint32_t i = FindIndex(v);
+ if (static_cast<uint32_t>(table_[i]) == v) {
+ table_[i] = kDel;
+ }
+ }
+
+ // Iteration: is done via HASH_FOR_EACH
+ // Example:
+ // HASH_FOR_EACH(elem, node->out) { ... }
+#define HASH_FOR_EACH(elem, eset) \
+ for (int32_t elem, _cursor = 0; (eset).Next(&_cursor, &elem); )
+ bool Next(int32_t* cursor, int32_t* elem) {
+ while (static_cast<uint32_t>(*cursor) < table_.size()) {
+ int32_t v = table_[*cursor];
+ (*cursor)++;
+ if (v >= 0) {
+ *elem = v;
+ return true;
+ }
+ }
+ return false;
+ }
+
+ private:
+ enum : int32_t { kEmpty = -1, kDel = -2 };
+ Vec<int32_t> table_;
+ uint32_t occupied_; // Count of non-empty slots (includes deleted slots)
+
+ static uint32_t Hash(uint32_t a) { return a * 41; }
+
+ // Return index for storing v. May return an empty index or deleted index
+ int FindIndex(int32_t v) const {
+ // Search starting at hash index.
+ const uint32_t mask = table_.size() - 1;
+ uint32_t i = Hash(v) & mask;
+ int deleted_index = -1; // If >= 0, index of first deleted element we see
+ while (true) {
+ int32_t e = table_[i];
+ if (v == e) {
+ return i;
+ } else if (e == kEmpty) {
+ // Return any previously encountered deleted slot.
+ return (deleted_index >= 0) ? deleted_index : i;
+ } else if (e == kDel && deleted_index < 0) {
+ // Keep searching since v might be present later.
+ deleted_index = i;
+ }
+ i = (i + 1) & mask; // Linear probing; quadratic is slightly slower.
+ }
+ }
+
+ void Init() {
+ table_.clear();
+ table_.resize(kInline);
+ table_.fill(kEmpty);
+ occupied_ = 0;
+ }
+
+ void Grow() {
+ Vec<int32_t> copy;
+ copy.MoveFrom(&table_);
+ occupied_ = 0;
+ table_.resize(copy.size() * 2);
+ table_.fill(kEmpty);
+
+ for (const auto& e : copy) {
+ if (e >= 0) insert(e);
+ }
+ }
+
+ NodeSet(const NodeSet&) = delete;
+ NodeSet& operator=(const NodeSet&) = delete;
+};
+
+// We encode a node index and a node version in GraphId. The version
+// number is incremented when the GraphId is freed which automatically
+// invalidates all copies of the GraphId.
+
+inline GraphId MakeId(int32_t index, uint32_t version) {
+ GraphId g;
+ g.handle =
+ (static_cast<uint64_t>(version) << 32) | static_cast<uint32_t>(index);
+ return g;
+}
+
+inline int32_t NodeIndex(GraphId id) {
+ return static_cast<uint32_t>(id.handle & 0xfffffffful);
+}
+
+inline uint32_t NodeVersion(GraphId id) {
+ return static_cast<uint32_t>(id.handle >> 32);
+}
+
+struct Node {
+ int32_t rank; // rank number assigned by Pearce-Kelly algorithm
+ uint32_t version; // Current version number
+ int32_t next_hash; // Next entry in hash table
+ bool visited; // Temporary marker used by depth-first-search
+ uintptr_t masked_ptr; // User-supplied pointer
+ NodeSet in; // List of immediate predecessor nodes in graph
+ NodeSet out; // List of immediate successor nodes in graph
+ int priority; // Priority of recorded stack trace.
+ int nstack; // Depth of recorded stack trace.
+ void* stack[40]; // stack[0,nstack-1] holds stack trace for node.
+};
+
+// Hash table for pointer to node index lookups.
+class PointerMap {
+ public:
+ explicit PointerMap(const Vec<Node*>* nodes) : nodes_(nodes) {
+ table_.fill(-1);
+ }
+
+ int32_t Find(void* ptr) {
+ auto masked = base_internal::HidePtr(ptr);
+ for (int32_t i = table_[Hash(ptr)]; i != -1;) {
+ Node* n = (*nodes_)[i];
+ if (n->masked_ptr == masked) return i;
+ i = n->next_hash;
+ }
+ return -1;
+ }
+
+ void Add(void* ptr, int32_t i) {
+ int32_t* head = &table_[Hash(ptr)];
+ (*nodes_)[i]->next_hash = *head;
+ *head = i;
+ }
+
+ int32_t Remove(void* ptr) {
+ // Advance through linked list while keeping track of the
+ // predecessor slot that points to the current entry.
+ auto masked = base_internal::HidePtr(ptr);
+ for (int32_t* slot = &table_[Hash(ptr)]; *slot != -1; ) {
+ int32_t index = *slot;
+ Node* n = (*nodes_)[index];
+ if (n->masked_ptr == masked) {
+ *slot = n->next_hash; // Remove n from linked list
+ n->next_hash = -1;
+ return index;
+ }
+ slot = &n->next_hash;
+ }
+ return -1;
+ }
+
+ private:
+ // Number of buckets in hash table for pointer lookups.
+ static constexpr uint32_t kHashTableSize = 8171; // should be prime
+
+ const Vec<Node*>* nodes_;
+ std::array<int32_t, kHashTableSize> table_;
+
+ static uint32_t Hash(void* ptr) {
+ return reinterpret_cast<uintptr_t>(ptr) % kHashTableSize;
+ }
+};
+
+} // namespace
+
+struct GraphCycles::Rep {
+ Vec<Node*> nodes_;
+ Vec<int32_t> free_nodes_; // Indices for unused entries in nodes_
+ PointerMap ptrmap_;
+
+ // Temporary state.
+ Vec<int32_t> deltaf_; // Results of forward DFS
+ Vec<int32_t> deltab_; // Results of backward DFS
+ Vec<int32_t> list_; // All nodes to reprocess
+ Vec<int32_t> merged_; // Rank values to assign to list_ entries
+ Vec<int32_t> stack_; // Emulates recursion stack for depth-first searches
+
+ Rep() : ptrmap_(&nodes_) {}
+};
+
+static Node* FindNode(GraphCycles::Rep* rep, GraphId id) {
+ Node* n = rep->nodes_[NodeIndex(id)];
+ return (n->version == NodeVersion(id)) ? n : nullptr;
+}
+
+GraphCycles::GraphCycles() {
+ InitArenaIfNecessary();
+ rep_ = new (base_internal::LowLevelAlloc::AllocWithArena(sizeof(Rep), arena))
+ Rep;
+}
+
+GraphCycles::~GraphCycles() {
+ for (auto* node : rep_->nodes_) {
+ node->Node::~Node();
+ base_internal::LowLevelAlloc::Free(node);
+ }
+ rep_->Rep::~Rep();
+ base_internal::LowLevelAlloc::Free(rep_);
+}
+
+bool GraphCycles::CheckInvariants() const {
+ Rep* r = rep_;
+ NodeSet ranks; // Set of ranks seen so far.
+ for (uint32_t x = 0; x < r->nodes_.size(); x++) {
+ Node* nx = r->nodes_[x];
+ void* ptr = base_internal::UnhidePtr<void>(nx->masked_ptr);
+ if (ptr != nullptr && static_cast<uint32_t>(r->ptrmap_.Find(ptr)) != x) {
+ ABSL_RAW_LOG(FATAL, "Did not find live node in hash table %u %p", x, ptr);
+ }
+ if (nx->visited) {
+ ABSL_RAW_LOG(FATAL, "Did not clear visited marker on node %u", x);
+ }
+ if (!ranks.insert(nx->rank)) {
+ ABSL_RAW_LOG(FATAL, "Duplicate occurrence of rank %d", nx->rank);
+ }
+ HASH_FOR_EACH(y, nx->out) {
+ Node* ny = r->nodes_[y];
+ if (nx->rank >= ny->rank) {
+ ABSL_RAW_LOG(FATAL, "Edge %u->%d has bad rank assignment %d->%d", x, y,
+ nx->rank, ny->rank);
+ }
+ }
+ }
+ return true;
+}
+
+GraphId GraphCycles::GetId(void* ptr) {
+ int32_t i = rep_->ptrmap_.Find(ptr);
+ if (i != -1) {
+ return MakeId(i, rep_->nodes_[i]->version);
+ } else if (rep_->free_nodes_.empty()) {
+ Node* n =
+ new (base_internal::LowLevelAlloc::AllocWithArena(sizeof(Node), arena))
+ Node;
+ n->version = 1; // Avoid 0 since it is used by InvalidGraphId()
+ n->visited = false;
+ n->rank = rep_->nodes_.size();
+ n->masked_ptr = base_internal::HidePtr(ptr);
+ n->nstack = 0;
+ n->priority = 0;
+ rep_->nodes_.push_back(n);
+ rep_->ptrmap_.Add(ptr, n->rank);
+ return MakeId(n->rank, n->version);
+ } else {
+ // Preserve preceding rank since the set of ranks in use must be
+ // a permutation of [0,rep_->nodes_.size()-1].
+ int32_t r = rep_->free_nodes_.back();
+ rep_->free_nodes_.pop_back();
+ Node* n = rep_->nodes_[r];
+ n->masked_ptr = base_internal::HidePtr(ptr);
+ n->nstack = 0;
+ n->priority = 0;
+ rep_->ptrmap_.Add(ptr, r);
+ return MakeId(r, n->version);
+ }
+}
+
+void GraphCycles::RemoveNode(void* ptr) {
+ int32_t i = rep_->ptrmap_.Remove(ptr);
+ if (i == -1) {
+ return;
+ }
+ Node* x = rep_->nodes_[i];
+ HASH_FOR_EACH(y, x->out) {
+ rep_->nodes_[y]->in.erase(i);
+ }
+ HASH_FOR_EACH(y, x->in) {
+ rep_->nodes_[y]->out.erase(i);
+ }
+ x->in.clear();
+ x->out.clear();
+ x->masked_ptr = base_internal::HidePtr<void>(nullptr);
+ if (x->version == std::numeric_limits<uint32_t>::max()) {
+ // Cannot use x any more
+ } else {
+ x->version++; // Invalidates all copies of node.
+ rep_->free_nodes_.push_back(i);
+ }
+}
+
+void* GraphCycles::Ptr(GraphId id) {
+ Node* n = FindNode(rep_, id);
+ return n == nullptr ? nullptr
+ : base_internal::UnhidePtr<void>(n->masked_ptr);
+}
+
+bool GraphCycles::HasNode(GraphId node) {
+ return FindNode(rep_, node) != nullptr;
+}
+
+bool GraphCycles::HasEdge(GraphId x, GraphId y) const {
+ Node* xn = FindNode(rep_, x);
+ return xn && FindNode(rep_, y) && xn->out.contains(NodeIndex(y));
+}
+
+void GraphCycles::RemoveEdge(GraphId x, GraphId y) {
+ Node* xn = FindNode(rep_, x);
+ Node* yn = FindNode(rep_, y);
+ if (xn && yn) {
+ xn->out.erase(NodeIndex(y));
+ yn->in.erase(NodeIndex(x));
+ // No need to update the rank assignment since a previous valid
+ // rank assignment remains valid after an edge deletion.
+ }
+}
+
+static bool ForwardDFS(GraphCycles::Rep* r, int32_t n, int32_t upper_bound);
+static void BackwardDFS(GraphCycles::Rep* r, int32_t n, int32_t lower_bound);
+static void Reorder(GraphCycles::Rep* r);
+static void Sort(const Vec<Node*>&, Vec<int32_t>* delta);
+static void MoveToList(
+ GraphCycles::Rep* r, Vec<int32_t>* src, Vec<int32_t>* dst);
+
+bool GraphCycles::InsertEdge(GraphId idx, GraphId idy) {
+ Rep* r = rep_;
+ const int32_t x = NodeIndex(idx);
+ const int32_t y = NodeIndex(idy);
+ Node* nx = FindNode(r, idx);
+ Node* ny = FindNode(r, idy);
+ if (nx == nullptr || ny == nullptr) return true; // Expired ids
+
+ if (nx == ny) return false; // Self edge
+ if (!nx->out.insert(y)) {
+ // Edge already exists.
+ return true;
+ }
+
+ ny->in.insert(x);
+
+ if (nx->rank <= ny->rank) {
+ // New edge is consistent with existing rank assignment.
+ return true;
+ }
+
+ // Current rank assignments are incompatible with the new edge. Recompute.
+ // We only need to consider nodes that fall in the range [ny->rank,nx->rank].
+ if (!ForwardDFS(r, y, nx->rank)) {
+ // Found a cycle. Undo the insertion and tell caller.
+ nx->out.erase(y);
+ ny->in.erase(x);
+ // Since we do not call Reorder() on this path, clear any visited
+ // markers left by ForwardDFS.
+ for (const auto& d : r->deltaf_) {
+ r->nodes_[d]->visited = false;
+ }
+ return false;
+ }
+ BackwardDFS(r, x, ny->rank);
+ Reorder(r);
+ return true;
+}
+
+static bool ForwardDFS(GraphCycles::Rep* r, int32_t n, int32_t upper_bound) {
+ // Avoid recursion since stack space might be limited.
+ // We instead keep a stack of nodes to visit.
+ r->deltaf_.clear();
+ r->stack_.clear();
+ r->stack_.push_back(n);
+ while (!r->stack_.empty()) {
+ n = r->stack_.back();
+ r->stack_.pop_back();
+ Node* nn = r->nodes_[n];
+ if (nn->visited) continue;
+
+ nn->visited = true;
+ r->deltaf_.push_back(n);
+
+ HASH_FOR_EACH(w, nn->out) {
+ Node* nw = r->nodes_[w];
+ if (nw->rank == upper_bound) {
+ return false; // Cycle
+ }
+ if (!nw->visited && nw->rank < upper_bound) {
+ r->stack_.push_back(w);
+ }
+ }
+ }
+ return true;
+}
+
+static void BackwardDFS(GraphCycles::Rep* r, int32_t n, int32_t lower_bound) {
+ r->deltab_.clear();
+ r->stack_.clear();
+ r->stack_.push_back(n);
+ while (!r->stack_.empty()) {
+ n = r->stack_.back();
+ r->stack_.pop_back();
+ Node* nn = r->nodes_[n];
+ if (nn->visited) continue;
+
+ nn->visited = true;
+ r->deltab_.push_back(n);
+
+ HASH_FOR_EACH(w, nn->in) {
+ Node* nw = r->nodes_[w];
+ if (!nw->visited && lower_bound < nw->rank) {
+ r->stack_.push_back(w);
+ }
+ }
+ }
+}
+
+static void Reorder(GraphCycles::Rep* r) {
+ Sort(r->nodes_, &r->deltab_);
+ Sort(r->nodes_, &r->deltaf_);
+
+ // Adds contents of delta lists to list_ (backwards deltas first).
+ r->list_.clear();
+ MoveToList(r, &r->deltab_, &r->list_);
+ MoveToList(r, &r->deltaf_, &r->list_);
+
+ // Produce sorted list of all ranks that will be reassigned.
+ r->merged_.resize(r->deltab_.size() + r->deltaf_.size());
+ std::merge(r->deltab_.begin(), r->deltab_.end(),
+ r->deltaf_.begin(), r->deltaf_.end(),
+ r->merged_.begin());
+
+ // Assign the ranks in order to the collected list.
+ for (uint32_t i = 0; i < r->list_.size(); i++) {
+ r->nodes_[r->list_[i]]->rank = r->merged_[i];
+ }
+}
+
+static void Sort(const Vec<Node*>& nodes, Vec<int32_t>* delta) {
+ struct ByRank {
+ const Vec<Node*>* nodes;
+ bool operator()(int32_t a, int32_t b) const {
+ return (*nodes)[a]->rank < (*nodes)[b]->rank;
+ }
+ };
+ ByRank cmp;
+ cmp.nodes = &nodes;
+ std::sort(delta->begin(), delta->end(), cmp);
+}
+
+static void MoveToList(
+ GraphCycles::Rep* r, Vec<int32_t>* src, Vec<int32_t>* dst) {
+ for (auto& v : *src) {
+ int32_t w = v;
+ v = r->nodes_[w]->rank; // Replace v entry with its rank
+ r->nodes_[w]->visited = false; // Prepare for future DFS calls
+ dst->push_back(w);
+ }
+}
+
+int GraphCycles::FindPath(GraphId idx, GraphId idy, int max_path_len,
+ GraphId path[]) const {
+ Rep* r = rep_;
+ if (FindNode(r, idx) == nullptr || FindNode(r, idy) == nullptr) return 0;
+ const int32_t x = NodeIndex(idx);
+ const int32_t y = NodeIndex(idy);
+
+ // Forward depth first search starting at x until we hit y.
+ // As we descend into a node, we push it onto the path.
+ // As we leave a node, we remove it from the path.
+ int path_len = 0;
+
+ NodeSet seen;
+ r->stack_.clear();
+ r->stack_.push_back(x);
+ while (!r->stack_.empty()) {
+ int32_t n = r->stack_.back();
+ r->stack_.pop_back();
+ if (n < 0) {
+ // Marker to indicate that we are leaving a node
+ path_len--;
+ continue;
+ }
+
+ if (path_len < max_path_len) {
+ path[path_len] = MakeId(n, rep_->nodes_[n]->version);
+ }
+ path_len++;
+ r->stack_.push_back(-1); // Will remove tentative path entry
+
+ if (n == y) {
+ return path_len;
+ }
+
+ HASH_FOR_EACH(w, r->nodes_[n]->out) {
+ if (seen.insert(w)) {
+ r->stack_.push_back(w);
+ }
+ }
+ }
+
+ return 0;
+}
+
+bool GraphCycles::IsReachable(GraphId x, GraphId y) const {
+ return FindPath(x, y, 0, nullptr) > 0;
+}
+
+void GraphCycles::UpdateStackTrace(GraphId id, int priority,
+ int (*get_stack_trace)(void** stack, int)) {
+ Node* n = FindNode(rep_, id);
+ if (n == nullptr || n->priority >= priority) {
+ return;
+ }
+ n->nstack = (*get_stack_trace)(n->stack, ABSL_ARRAYSIZE(n->stack));
+ n->priority = priority;
+}
+
+int GraphCycles::GetStackTrace(GraphId id, void*** ptr) {
+ Node* n = FindNode(rep_, id);
+ if (n == nullptr) {
+ *ptr = nullptr;
+ return 0;
+ } else {
+ *ptr = n->stack;
+ return n->nstack;
+ }
+}
+
+} // namespace synchronization_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_LOW_LEVEL_ALLOC_MISSING
diff --git a/third_party/abseil/src/absl/synchronization/internal/graphcycles.h b/third_party/abseil/src/absl/synchronization/internal/graphcycles.h
new file mode 100644
index 0000000..ceba33e
--- /dev/null
+++ b/third_party/abseil/src/absl/synchronization/internal/graphcycles.h
@@ -0,0 +1,141 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+#ifndef ABSL_SYNCHRONIZATION_INTERNAL_GRAPHCYCLES_H_
+#define ABSL_SYNCHRONIZATION_INTERNAL_GRAPHCYCLES_H_
+
+// GraphCycles detects the introduction of a cycle into a directed
+// graph that is being built up incrementally.
+//
+// Nodes are identified by small integers. It is not possible to
+// record multiple edges with the same (source, destination) pair;
+// requests to add an edge where one already exists are silently
+// ignored.
+//
+// It is also not possible to introduce a cycle; an attempt to insert
+// an edge that would introduce a cycle fails and returns false.
+//
+// GraphCycles uses no internal locking; calls into it should be
+// serialized externally.
+
+// Performance considerations:
+// Works well on sparse graphs, poorly on dense graphs.
+// Extra information is maintained incrementally to detect cycles quickly.
+// InsertEdge() is very fast when the edge already exists, and reasonably fast
+// otherwise.
+// FindPath() is linear in the size of the graph.
+// The current implementation uses O(|V|+|E|) space.
+
+#include <cstdint>
+
+#include "absl/base/config.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace synchronization_internal {
+
+// Opaque identifier for a graph node.
+struct GraphId {
+ uint64_t handle;
+
+ bool operator==(const GraphId& x) const { return handle == x.handle; }
+ bool operator!=(const GraphId& x) const { return handle != x.handle; }
+};
+
+// Return an invalid graph id that will never be assigned by GraphCycles.
+inline GraphId InvalidGraphId() {
+ return GraphId{0};
+}
+
+class GraphCycles {
+ public:
+ GraphCycles();
+ ~GraphCycles();
+
+ // Return the id to use for ptr, assigning one if necessary.
+ // Subsequent calls with the same ptr value will return the same id
+ // until Remove().
+ GraphId GetId(void* ptr);
+
+ // Remove "ptr" from the graph. Its corresponding node and all
+ // edges to and from it are removed.
+ void RemoveNode(void* ptr);
+
+ // Return the pointer associated with id, or nullptr if id is not
+ // currently in the graph.
+ void* Ptr(GraphId id);
+
+ // Attempt to insert an edge from source_node to dest_node. If the
+ // edge would introduce a cycle, return false without making any
+ // changes. Otherwise add the edge and return true.
+ bool InsertEdge(GraphId source_node, GraphId dest_node);
+
+ // Remove any edge that exists from source_node to dest_node.
+ void RemoveEdge(GraphId source_node, GraphId dest_node);
+
+ // Return whether node exists in the graph.
+ bool HasNode(GraphId node);
+
+ // Return whether there is an edge directly from source_node to dest_node.
+ bool HasEdge(GraphId source_node, GraphId dest_node) const;
+
+ // Return whether dest_node is reachable from source_node
+ // by following edges.
+ bool IsReachable(GraphId source_node, GraphId dest_node) const;
+
+ // Find a path from "source" to "dest". If such a path exists,
+ // place the nodes on the path in the array path[], and return
+ // the number of nodes on the path. If the path is longer than
+ // max_path_len nodes, only the first max_path_len nodes are placed
+ // in path[]. The client should compare the return value with
+ // max_path_len" to see when this occurs. If no path exists, return
+ // 0. Any valid path stored in path[] will start with "source" and
+ // end with "dest". There is no guarantee that the path is the
+ // shortest, but no node will appear twice in the path, except the
+ // source and destination node if they are identical; therefore, the
+ // return value is at most one greater than the number of nodes in
+ // the graph.
+ int FindPath(GraphId source, GraphId dest, int max_path_len,
+ GraphId path[]) const;
+
+ // Update the stack trace recorded for id with the current stack
+ // trace if the last time it was updated had a smaller priority
+ // than the priority passed on this call.
+ //
+ // *get_stack_trace is called to get the stack trace.
+ void UpdateStackTrace(GraphId id, int priority,
+ int (*get_stack_trace)(void**, int));
+
+ // Set *ptr to the beginning of the array that holds the recorded
+ // stack trace for id and return the depth of the stack trace.
+ int GetStackTrace(GraphId id, void*** ptr);
+
+ // Check internal invariants. Crashes on failure, returns true on success.
+ // Expensive: should only be called from graphcycles_test.cc.
+ bool CheckInvariants() const;
+
+ // ----------------------------------------------------
+ struct Rep;
+ private:
+ Rep *rep_; // opaque representation
+ GraphCycles(const GraphCycles&) = delete;
+ GraphCycles& operator=(const GraphCycles&) = delete;
+};
+
+} // namespace synchronization_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif
diff --git a/third_party/abseil/src/absl/synchronization/internal/graphcycles_benchmark.cc b/third_party/abseil/src/absl/synchronization/internal/graphcycles_benchmark.cc
new file mode 100644
index 0000000..54823e0
--- /dev/null
+++ b/third_party/abseil/src/absl/synchronization/internal/graphcycles_benchmark.cc
@@ -0,0 +1,44 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/synchronization/internal/graphcycles.h"
+
+#include <algorithm>
+#include <cstdint>
+#include <vector>
+
+#include "benchmark/benchmark.h"
+#include "absl/base/internal/raw_logging.h"
+
+namespace {
+
+void BM_StressTest(benchmark::State& state) {
+ const int num_nodes = state.range(0);
+ while (state.KeepRunningBatch(num_nodes)) {
+ absl::synchronization_internal::GraphCycles g;
+ std::vector<absl::synchronization_internal::GraphId> nodes(num_nodes);
+ for (int i = 0; i < num_nodes; i++) {
+ nodes[i] = g.GetId(reinterpret_cast<void*>(static_cast<uintptr_t>(i)));
+ }
+ for (int i = 0; i < num_nodes; i++) {
+ int end = std::min(num_nodes, i + 5);
+ for (int j = i + 1; j < end; j++) {
+ ABSL_RAW_CHECK(g.InsertEdge(nodes[i], nodes[j]), "");
+ }
+ }
+ }
+}
+BENCHMARK(BM_StressTest)->Range(2048, 1048576);
+
+} // namespace
diff --git a/third_party/abseil/src/absl/synchronization/internal/graphcycles_test.cc b/third_party/abseil/src/absl/synchronization/internal/graphcycles_test.cc
new file mode 100644
index 0000000..74eaffe
--- /dev/null
+++ b/third_party/abseil/src/absl/synchronization/internal/graphcycles_test.cc
@@ -0,0 +1,464 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/synchronization/internal/graphcycles.h"
+
+#include <map>
+#include <random>
+#include <unordered_set>
+#include <utility>
+#include <vector>
+
+#include "gtest/gtest.h"
+#include "absl/base/internal/raw_logging.h"
+#include "absl/base/macros.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace synchronization_internal {
+
+// We emulate a GraphCycles object with a node vector and an edge vector.
+// We then compare the two implementations.
+
+using Nodes = std::vector<int>;
+struct Edge {
+ int from;
+ int to;
+};
+using Edges = std::vector<Edge>;
+using RandomEngine = std::mt19937_64;
+
+// Mapping from integer index to GraphId.
+typedef std::map<int, GraphId> IdMap;
+static GraphId Get(const IdMap& id, int num) {
+ auto iter = id.find(num);
+ return (iter == id.end()) ? InvalidGraphId() : iter->second;
+}
+
+// Return whether "to" is reachable from "from".
+static bool IsReachable(Edges *edges, int from, int to,
+ std::unordered_set<int> *seen) {
+ seen->insert(from); // we are investigating "from"; don't do it again
+ if (from == to) return true;
+ for (const auto &edge : *edges) {
+ if (edge.from == from) {
+ if (edge.to == to) { // success via edge directly
+ return true;
+ } else if (seen->find(edge.to) == seen->end() && // success via edge
+ IsReachable(edges, edge.to, to, seen)) {
+ return true;
+ }
+ }
+ }
+ return false;
+}
+
+static void PrintEdges(Edges *edges) {
+ ABSL_RAW_LOG(INFO, "EDGES (%zu)", edges->size());
+ for (const auto &edge : *edges) {
+ int a = edge.from;
+ int b = edge.to;
+ ABSL_RAW_LOG(INFO, "%d %d", a, b);
+ }
+ ABSL_RAW_LOG(INFO, "---");
+}
+
+static void PrintGCEdges(Nodes *nodes, const IdMap &id, GraphCycles *gc) {
+ ABSL_RAW_LOG(INFO, "GC EDGES");
+ for (int a : *nodes) {
+ for (int b : *nodes) {
+ if (gc->HasEdge(Get(id, a), Get(id, b))) {
+ ABSL_RAW_LOG(INFO, "%d %d", a, b);
+ }
+ }
+ }
+ ABSL_RAW_LOG(INFO, "---");
+}
+
+static void PrintTransitiveClosure(Nodes *nodes, Edges *edges) {
+ ABSL_RAW_LOG(INFO, "Transitive closure");
+ for (int a : *nodes) {
+ for (int b : *nodes) {
+ std::unordered_set<int> seen;
+ if (IsReachable(edges, a, b, &seen)) {
+ ABSL_RAW_LOG(INFO, "%d %d", a, b);
+ }
+ }
+ }
+ ABSL_RAW_LOG(INFO, "---");
+}
+
+static void PrintGCTransitiveClosure(Nodes *nodes, const IdMap &id,
+ GraphCycles *gc) {
+ ABSL_RAW_LOG(INFO, "GC Transitive closure");
+ for (int a : *nodes) {
+ for (int b : *nodes) {
+ if (gc->IsReachable(Get(id, a), Get(id, b))) {
+ ABSL_RAW_LOG(INFO, "%d %d", a, b);
+ }
+ }
+ }
+ ABSL_RAW_LOG(INFO, "---");
+}
+
+static void CheckTransitiveClosure(Nodes *nodes, Edges *edges, const IdMap &id,
+ GraphCycles *gc) {
+ std::unordered_set<int> seen;
+ for (const auto &a : *nodes) {
+ for (const auto &b : *nodes) {
+ seen.clear();
+ bool gc_reachable = gc->IsReachable(Get(id, a), Get(id, b));
+ bool reachable = IsReachable(edges, a, b, &seen);
+ if (gc_reachable != reachable) {
+ PrintEdges(edges);
+ PrintGCEdges(nodes, id, gc);
+ PrintTransitiveClosure(nodes, edges);
+ PrintGCTransitiveClosure(nodes, id, gc);
+ ABSL_RAW_LOG(FATAL, "gc_reachable %s reachable %s a %d b %d",
+ gc_reachable ? "true" : "false",
+ reachable ? "true" : "false", a, b);
+ }
+ }
+ }
+}
+
+static void CheckEdges(Nodes *nodes, Edges *edges, const IdMap &id,
+ GraphCycles *gc) {
+ int count = 0;
+ for (const auto &edge : *edges) {
+ int a = edge.from;
+ int b = edge.to;
+ if (!gc->HasEdge(Get(id, a), Get(id, b))) {
+ PrintEdges(edges);
+ PrintGCEdges(nodes, id, gc);
+ ABSL_RAW_LOG(FATAL, "!gc->HasEdge(%d, %d)", a, b);
+ }
+ }
+ for (const auto &a : *nodes) {
+ for (const auto &b : *nodes) {
+ if (gc->HasEdge(Get(id, a), Get(id, b))) {
+ count++;
+ }
+ }
+ }
+ if (count != edges->size()) {
+ PrintEdges(edges);
+ PrintGCEdges(nodes, id, gc);
+ ABSL_RAW_LOG(FATAL, "edges->size() %zu count %d", edges->size(), count);
+ }
+}
+
+static void CheckInvariants(const GraphCycles &gc) {
+ if (ABSL_PREDICT_FALSE(!gc.CheckInvariants()))
+ ABSL_RAW_LOG(FATAL, "CheckInvariants");
+}
+
+// Returns the index of a randomly chosen node in *nodes.
+// Requires *nodes be non-empty.
+static int RandomNode(RandomEngine* rng, Nodes *nodes) {
+ std::uniform_int_distribution<int> uniform(0, nodes->size()-1);
+ return uniform(*rng);
+}
+
+// Returns the index of a randomly chosen edge in *edges.
+// Requires *edges be non-empty.
+static int RandomEdge(RandomEngine* rng, Edges *edges) {
+ std::uniform_int_distribution<int> uniform(0, edges->size()-1);
+ return uniform(*rng);
+}
+
+// Returns the index of edge (from, to) in *edges or -1 if it is not in *edges.
+static int EdgeIndex(Edges *edges, int from, int to) {
+ int i = 0;
+ while (i != edges->size() &&
+ ((*edges)[i].from != from || (*edges)[i].to != to)) {
+ i++;
+ }
+ return i == edges->size()? -1 : i;
+}
+
+TEST(GraphCycles, RandomizedTest) {
+ int next_node = 0;
+ Nodes nodes;
+ Edges edges; // from, to
+ IdMap id;
+ GraphCycles graph_cycles;
+ static const int kMaxNodes = 7; // use <= 7 nodes to keep test short
+ static const int kDataOffset = 17; // an offset to the node-specific data
+ int n = 100000;
+ int op = 0;
+ RandomEngine rng(testing::UnitTest::GetInstance()->random_seed());
+ std::uniform_int_distribution<int> uniform(0, 5);
+
+ auto ptr = [](intptr_t i) {
+ return reinterpret_cast<void*>(i + kDataOffset);
+ };
+
+ for (int iter = 0; iter != n; iter++) {
+ for (const auto &node : nodes) {
+ ASSERT_EQ(graph_cycles.Ptr(Get(id, node)), ptr(node)) << " node " << node;
+ }
+ CheckEdges(&nodes, &edges, id, &graph_cycles);
+ CheckTransitiveClosure(&nodes, &edges, id, &graph_cycles);
+ op = uniform(rng);
+ switch (op) {
+ case 0: // Add a node
+ if (nodes.size() < kMaxNodes) {
+ int new_node = next_node++;
+ GraphId new_gnode = graph_cycles.GetId(ptr(new_node));
+ ASSERT_NE(new_gnode, InvalidGraphId());
+ id[new_node] = new_gnode;
+ ASSERT_EQ(ptr(new_node), graph_cycles.Ptr(new_gnode));
+ nodes.push_back(new_node);
+ }
+ break;
+
+ case 1: // Remove a node
+ if (nodes.size() > 0) {
+ int node_index = RandomNode(&rng, &nodes);
+ int node = nodes[node_index];
+ nodes[node_index] = nodes.back();
+ nodes.pop_back();
+ graph_cycles.RemoveNode(ptr(node));
+ ASSERT_EQ(graph_cycles.Ptr(Get(id, node)), nullptr);
+ id.erase(node);
+ int i = 0;
+ while (i != edges.size()) {
+ if (edges[i].from == node || edges[i].to == node) {
+ edges[i] = edges.back();
+ edges.pop_back();
+ } else {
+ i++;
+ }
+ }
+ }
+ break;
+
+ case 2: // Add an edge
+ if (nodes.size() > 0) {
+ int from = RandomNode(&rng, &nodes);
+ int to = RandomNode(&rng, &nodes);
+ if (EdgeIndex(&edges, nodes[from], nodes[to]) == -1) {
+ if (graph_cycles.InsertEdge(id[nodes[from]], id[nodes[to]])) {
+ Edge new_edge;
+ new_edge.from = nodes[from];
+ new_edge.to = nodes[to];
+ edges.push_back(new_edge);
+ } else {
+ std::unordered_set<int> seen;
+ ASSERT_TRUE(IsReachable(&edges, nodes[to], nodes[from], &seen))
+ << "Edge " << nodes[to] << "->" << nodes[from];
+ }
+ }
+ }
+ break;
+
+ case 3: // Remove an edge
+ if (edges.size() > 0) {
+ int i = RandomEdge(&rng, &edges);
+ int from = edges[i].from;
+ int to = edges[i].to;
+ ASSERT_EQ(i, EdgeIndex(&edges, from, to));
+ edges[i] = edges.back();
+ edges.pop_back();
+ ASSERT_EQ(-1, EdgeIndex(&edges, from, to));
+ graph_cycles.RemoveEdge(id[from], id[to]);
+ }
+ break;
+
+ case 4: // Check a path
+ if (nodes.size() > 0) {
+ int from = RandomNode(&rng, &nodes);
+ int to = RandomNode(&rng, &nodes);
+ GraphId path[2*kMaxNodes];
+ int path_len = graph_cycles.FindPath(id[nodes[from]], id[nodes[to]],
+ ABSL_ARRAYSIZE(path), path);
+ std::unordered_set<int> seen;
+ bool reachable = IsReachable(&edges, nodes[from], nodes[to], &seen);
+ bool gc_reachable =
+ graph_cycles.IsReachable(Get(id, nodes[from]), Get(id, nodes[to]));
+ ASSERT_EQ(path_len != 0, reachable);
+ ASSERT_EQ(path_len != 0, gc_reachable);
+ // In the following line, we add one because a node can appear
+ // twice, if the path is from that node to itself, perhaps via
+ // every other node.
+ ASSERT_LE(path_len, kMaxNodes + 1);
+ if (path_len != 0) {
+ ASSERT_EQ(id[nodes[from]], path[0]);
+ ASSERT_EQ(id[nodes[to]], path[path_len-1]);
+ for (int i = 1; i < path_len; i++) {
+ ASSERT_TRUE(graph_cycles.HasEdge(path[i-1], path[i]));
+ }
+ }
+ }
+ break;
+
+ case 5: // Check invariants
+ CheckInvariants(graph_cycles);
+ break;
+
+ default:
+ ABSL_RAW_LOG(FATAL, "op %d", op);
+ }
+
+ // Very rarely, test graph expansion by adding then removing many nodes.
+ std::bernoulli_distribution one_in_1024(1.0 / 1024);
+ if (one_in_1024(rng)) {
+ CheckEdges(&nodes, &edges, id, &graph_cycles);
+ CheckTransitiveClosure(&nodes, &edges, id, &graph_cycles);
+ for (int i = 0; i != 256; i++) {
+ int new_node = next_node++;
+ GraphId new_gnode = graph_cycles.GetId(ptr(new_node));
+ ASSERT_NE(InvalidGraphId(), new_gnode);
+ id[new_node] = new_gnode;
+ ASSERT_EQ(ptr(new_node), graph_cycles.Ptr(new_gnode));
+ for (const auto &node : nodes) {
+ ASSERT_NE(node, new_node);
+ }
+ nodes.push_back(new_node);
+ }
+ for (int i = 0; i != 256; i++) {
+ ASSERT_GT(nodes.size(), 0);
+ int node_index = RandomNode(&rng, &nodes);
+ int node = nodes[node_index];
+ nodes[node_index] = nodes.back();
+ nodes.pop_back();
+ graph_cycles.RemoveNode(ptr(node));
+ id.erase(node);
+ int j = 0;
+ while (j != edges.size()) {
+ if (edges[j].from == node || edges[j].to == node) {
+ edges[j] = edges.back();
+ edges.pop_back();
+ } else {
+ j++;
+ }
+ }
+ }
+ CheckInvariants(graph_cycles);
+ }
+ }
+}
+
+class GraphCyclesTest : public ::testing::Test {
+ public:
+ IdMap id_;
+ GraphCycles g_;
+
+ static void* Ptr(int i) {
+ return reinterpret_cast<void*>(static_cast<uintptr_t>(i));
+ }
+
+ static int Num(void* ptr) {
+ return static_cast<int>(reinterpret_cast<uintptr_t>(ptr));
+ }
+
+ // Test relies on ith NewNode() call returning Node numbered i
+ GraphCyclesTest() {
+ for (int i = 0; i < 100; i++) {
+ id_[i] = g_.GetId(Ptr(i));
+ }
+ CheckInvariants(g_);
+ }
+
+ bool AddEdge(int x, int y) {
+ return g_.InsertEdge(Get(id_, x), Get(id_, y));
+ }
+
+ void AddMultiples() {
+ // For every node x > 0: add edge to 2*x, 3*x
+ for (int x = 1; x < 25; x++) {
+ EXPECT_TRUE(AddEdge(x, 2*x)) << x;
+ EXPECT_TRUE(AddEdge(x, 3*x)) << x;
+ }
+ CheckInvariants(g_);
+ }
+
+ std::string Path(int x, int y) {
+ GraphId path[5];
+ int np = g_.FindPath(Get(id_, x), Get(id_, y), ABSL_ARRAYSIZE(path), path);
+ std::string result;
+ for (int i = 0; i < np; i++) {
+ if (i >= ABSL_ARRAYSIZE(path)) {
+ result += " ...";
+ break;
+ }
+ if (!result.empty()) result.push_back(' ');
+ char buf[20];
+ snprintf(buf, sizeof(buf), "%d", Num(g_.Ptr(path[i])));
+ result += buf;
+ }
+ return result;
+ }
+};
+
+TEST_F(GraphCyclesTest, NoCycle) {
+ AddMultiples();
+ CheckInvariants(g_);
+}
+
+TEST_F(GraphCyclesTest, SimpleCycle) {
+ AddMultiples();
+ EXPECT_FALSE(AddEdge(8, 4));
+ EXPECT_EQ("4 8", Path(4, 8));
+ CheckInvariants(g_);
+}
+
+TEST_F(GraphCyclesTest, IndirectCycle) {
+ AddMultiples();
+ EXPECT_TRUE(AddEdge(16, 9));
+ CheckInvariants(g_);
+ EXPECT_FALSE(AddEdge(9, 2));
+ EXPECT_EQ("2 4 8 16 9", Path(2, 9));
+ CheckInvariants(g_);
+}
+
+TEST_F(GraphCyclesTest, LongPath) {
+ ASSERT_TRUE(AddEdge(2, 4));
+ ASSERT_TRUE(AddEdge(4, 6));
+ ASSERT_TRUE(AddEdge(6, 8));
+ ASSERT_TRUE(AddEdge(8, 10));
+ ASSERT_TRUE(AddEdge(10, 12));
+ ASSERT_FALSE(AddEdge(12, 2));
+ EXPECT_EQ("2 4 6 8 10 ...", Path(2, 12));
+ CheckInvariants(g_);
+}
+
+TEST_F(GraphCyclesTest, RemoveNode) {
+ ASSERT_TRUE(AddEdge(1, 2));
+ ASSERT_TRUE(AddEdge(2, 3));
+ ASSERT_TRUE(AddEdge(3, 4));
+ ASSERT_TRUE(AddEdge(4, 5));
+ g_.RemoveNode(g_.Ptr(id_[3]));
+ id_.erase(3);
+ ASSERT_TRUE(AddEdge(5, 1));
+}
+
+TEST_F(GraphCyclesTest, ManyEdges) {
+ const int N = 50;
+ for (int i = 0; i < N; i++) {
+ for (int j = 1; j < N; j++) {
+ ASSERT_TRUE(AddEdge(i, i+j));
+ }
+ }
+ CheckInvariants(g_);
+ ASSERT_TRUE(AddEdge(2*N-1, 0));
+ CheckInvariants(g_);
+ ASSERT_FALSE(AddEdge(10, 9));
+ CheckInvariants(g_);
+}
+
+} // namespace synchronization_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/synchronization/internal/kernel_timeout.h b/third_party/abseil/src/absl/synchronization/internal/kernel_timeout.h
new file mode 100644
index 0000000..bbd4d2d
--- /dev/null
+++ b/third_party/abseil/src/absl/synchronization/internal/kernel_timeout.h
@@ -0,0 +1,156 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+// An optional absolute timeout, with nanosecond granularity,
+// compatible with absl::Time. Suitable for in-register
+// parameter-passing (e.g. syscalls.)
+// Constructible from a absl::Time (for a timeout to be respected) or {}
+// (for "no timeout".)
+// This is a private low-level API for use by a handful of low-level
+// components that are friends of this class. Higher-level components
+// should build APIs based on absl::Time and absl::Duration.
+
+#ifndef ABSL_SYNCHRONIZATION_INTERNAL_KERNEL_TIMEOUT_H_
+#define ABSL_SYNCHRONIZATION_INTERNAL_KERNEL_TIMEOUT_H_
+
+#include <time.h>
+
+#include <algorithm>
+#include <limits>
+
+#include "absl/base/internal/raw_logging.h"
+#include "absl/time/clock.h"
+#include "absl/time/time.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace synchronization_internal {
+
+class Futex;
+class Waiter;
+
+class KernelTimeout {
+ public:
+ // A timeout that should expire at <t>. Any value, in the full
+ // InfinitePast() to InfiniteFuture() range, is valid here and will be
+ // respected.
+ explicit KernelTimeout(absl::Time t) : ns_(MakeNs(t)) {}
+ // No timeout.
+ KernelTimeout() : ns_(0) {}
+
+ // A more explicit factory for those who prefer it. Equivalent to {}.
+ static KernelTimeout Never() { return {}; }
+
+ // We explicitly do not support other custom formats: timespec, int64_t nanos.
+ // Unify on this and absl::Time, please.
+
+ bool has_timeout() const { return ns_ != 0; }
+
+ // Convert to parameter for sem_timedwait/futex/similar. Only for approved
+ // users. Do not call if !has_timeout.
+ struct timespec MakeAbsTimespec();
+
+ private:
+ // internal rep, not user visible: ns after unix epoch.
+ // zero = no timeout.
+ // Negative we treat as an unlikely (and certainly expired!) but valid
+ // timeout.
+ int64_t ns_;
+
+ static int64_t MakeNs(absl::Time t) {
+ // optimization--InfiniteFuture is common "no timeout" value
+ // and cheaper to compare than convert.
+ if (t == absl::InfiniteFuture()) return 0;
+ int64_t x = ToUnixNanos(t);
+
+ // A timeout that lands exactly on the epoch (x=0) needs to be respected,
+ // so we alter it unnoticably to 1. Negative timeouts are in
+ // theory supported, but handled poorly by the kernel (long
+ // delays) so push them forward too; since all such times have
+ // already passed, it's indistinguishable.
+ if (x <= 0) x = 1;
+ // A time larger than what can be represented to the kernel is treated
+ // as no timeout.
+ if (x == (std::numeric_limits<int64_t>::max)()) x = 0;
+ return x;
+ }
+
+#ifdef _WIN32
+ // Converts to milliseconds from now, or INFINITE when
+ // !has_timeout(). For use by SleepConditionVariableSRW on
+ // Windows. Callers should recognize that the return value is a
+ // relative duration (it should be recomputed by calling this method
+ // in the case of a spurious wakeup).
+ // This header file may be included transitively by public header files,
+ // so we define our own DWORD and INFINITE instead of getting them from
+ // <intsafe.h> and <WinBase.h>.
+ typedef unsigned long DWord; // NOLINT
+ DWord InMillisecondsFromNow() const {
+ constexpr DWord kInfinite = (std::numeric_limits<DWord>::max)();
+ if (!has_timeout()) {
+ return kInfinite;
+ }
+ // The use of absl::Now() to convert from absolute time to
+ // relative time means that absl::Now() cannot use anything that
+ // depends on KernelTimeout (for example, Mutex) on Windows.
+ int64_t now = ToUnixNanos(absl::Now());
+ if (ns_ >= now) {
+ // Round up so that Now() + ms_from_now >= ns_.
+ constexpr uint64_t max_nanos =
+ (std::numeric_limits<int64_t>::max)() - 999999u;
+ uint64_t ms_from_now =
+ (std::min<uint64_t>(max_nanos, ns_ - now) + 999999u) / 1000000u;
+ if (ms_from_now > kInfinite) {
+ return kInfinite;
+ }
+ return static_cast<DWord>(ms_from_now);
+ }
+ return 0;
+ }
+#endif
+
+ friend class Futex;
+ friend class Waiter;
+};
+
+inline struct timespec KernelTimeout::MakeAbsTimespec() {
+ int64_t n = ns_;
+ static const int64_t kNanosPerSecond = 1000 * 1000 * 1000;
+ if (n == 0) {
+ ABSL_RAW_LOG(
+ ERROR, "Tried to create a timespec from a non-timeout; never do this.");
+ // But we'll try to continue sanely. no-timeout ~= saturated timeout.
+ n = (std::numeric_limits<int64_t>::max)();
+ }
+
+ // Kernel APIs validate timespecs as being at or after the epoch,
+ // despite the kernel time type being signed. However, no one can
+ // tell the difference between a timeout at or before the epoch (since
+ // all such timeouts have expired!)
+ if (n < 0) n = 0;
+
+ struct timespec abstime;
+ int64_t seconds = (std::min)(n / kNanosPerSecond,
+ int64_t{(std::numeric_limits<time_t>::max)()});
+ abstime.tv_sec = static_cast<time_t>(seconds);
+ abstime.tv_nsec = static_cast<decltype(abstime.tv_nsec)>(n % kNanosPerSecond);
+ return abstime;
+}
+
+} // namespace synchronization_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_SYNCHRONIZATION_INTERNAL_KERNEL_TIMEOUT_H_
diff --git a/third_party/abseil/src/absl/synchronization/internal/per_thread_sem.cc b/third_party/abseil/src/absl/synchronization/internal/per_thread_sem.cc
new file mode 100644
index 0000000..821ca9b
--- /dev/null
+++ b/third_party/abseil/src/absl/synchronization/internal/per_thread_sem.cc
@@ -0,0 +1,106 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// This file is a no-op if the required LowLevelAlloc support is missing.
+#include "absl/base/internal/low_level_alloc.h"
+#ifndef ABSL_LOW_LEVEL_ALLOC_MISSING
+
+#include "absl/synchronization/internal/per_thread_sem.h"
+
+#include <atomic>
+
+#include "absl/base/attributes.h"
+#include "absl/base/internal/thread_identity.h"
+#include "absl/synchronization/internal/waiter.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace synchronization_internal {
+
+void PerThreadSem::SetThreadBlockedCounter(std::atomic<int> *counter) {
+ base_internal::ThreadIdentity *identity;
+ identity = GetOrCreateCurrentThreadIdentity();
+ identity->blocked_count_ptr = counter;
+}
+
+std::atomic<int> *PerThreadSem::GetThreadBlockedCounter() {
+ base_internal::ThreadIdentity *identity;
+ identity = GetOrCreateCurrentThreadIdentity();
+ return identity->blocked_count_ptr;
+}
+
+void PerThreadSem::Init(base_internal::ThreadIdentity *identity) {
+ new (Waiter::GetWaiter(identity)) Waiter();
+ identity->ticker.store(0, std::memory_order_relaxed);
+ identity->wait_start.store(0, std::memory_order_relaxed);
+ identity->is_idle.store(false, std::memory_order_relaxed);
+}
+
+void PerThreadSem::Destroy(base_internal::ThreadIdentity *identity) {
+ Waiter::GetWaiter(identity)->~Waiter();
+}
+
+void PerThreadSem::Tick(base_internal::ThreadIdentity *identity) {
+ const int ticker =
+ identity->ticker.fetch_add(1, std::memory_order_relaxed) + 1;
+ const int wait_start = identity->wait_start.load(std::memory_order_relaxed);
+ const bool is_idle = identity->is_idle.load(std::memory_order_relaxed);
+ if (wait_start && (ticker - wait_start > Waiter::kIdlePeriods) && !is_idle) {
+ // Wakeup the waiting thread since it is time for it to become idle.
+ Waiter::GetWaiter(identity)->Poke();
+ }
+}
+
+} // namespace synchronization_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+extern "C" {
+
+ABSL_ATTRIBUTE_WEAK void AbslInternalPerThreadSemPost(
+ absl::base_internal::ThreadIdentity *identity) {
+ absl::synchronization_internal::Waiter::GetWaiter(identity)->Post();
+}
+
+ABSL_ATTRIBUTE_WEAK bool AbslInternalPerThreadSemWait(
+ absl::synchronization_internal::KernelTimeout t) {
+ bool timeout = false;
+ absl::base_internal::ThreadIdentity *identity;
+ identity = absl::synchronization_internal::GetOrCreateCurrentThreadIdentity();
+
+ // Ensure wait_start != 0.
+ int ticker = identity->ticker.load(std::memory_order_relaxed);
+ identity->wait_start.store(ticker ? ticker : 1, std::memory_order_relaxed);
+ identity->is_idle.store(false, std::memory_order_relaxed);
+
+ if (identity->blocked_count_ptr != nullptr) {
+ // Increment count of threads blocked in a given thread pool.
+ identity->blocked_count_ptr->fetch_add(1, std::memory_order_relaxed);
+ }
+
+ timeout =
+ !absl::synchronization_internal::Waiter::GetWaiter(identity)->Wait(t);
+
+ if (identity->blocked_count_ptr != nullptr) {
+ identity->blocked_count_ptr->fetch_sub(1, std::memory_order_relaxed);
+ }
+
+ identity->is_idle.store(false, std::memory_order_relaxed);
+ identity->wait_start.store(0, std::memory_order_relaxed);
+ return !timeout;
+}
+
+} // extern "C"
+
+#endif // ABSL_LOW_LEVEL_ALLOC_MISSING
diff --git a/third_party/abseil/src/absl/synchronization/internal/per_thread_sem.h b/third_party/abseil/src/absl/synchronization/internal/per_thread_sem.h
new file mode 100644
index 0000000..2228b6e
--- /dev/null
+++ b/third_party/abseil/src/absl/synchronization/internal/per_thread_sem.h
@@ -0,0 +1,115 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+// PerThreadSem is a low-level synchronization primitive controlling the
+// runnability of a single thread, used internally by Mutex and CondVar.
+//
+// This is NOT a general-purpose synchronization mechanism, and should not be
+// used directly by applications. Applications should use Mutex and CondVar.
+//
+// The semantics of PerThreadSem are the same as that of a counting semaphore.
+// Each thread maintains an abstract "count" value associated with its identity.
+
+#ifndef ABSL_SYNCHRONIZATION_INTERNAL_PER_THREAD_SEM_H_
+#define ABSL_SYNCHRONIZATION_INTERNAL_PER_THREAD_SEM_H_
+
+#include <atomic>
+
+#include "absl/base/internal/thread_identity.h"
+#include "absl/synchronization/internal/create_thread_identity.h"
+#include "absl/synchronization/internal/kernel_timeout.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+class Mutex;
+
+namespace synchronization_internal {
+
+class PerThreadSem {
+ public:
+ PerThreadSem() = delete;
+ PerThreadSem(const PerThreadSem&) = delete;
+ PerThreadSem& operator=(const PerThreadSem&) = delete;
+
+ // Routine invoked periodically (once a second) by a background thread.
+ // Has no effect on user-visible state.
+ static void Tick(base_internal::ThreadIdentity* identity);
+
+ // ---------------------------------------------------------------------------
+ // Routines used by autosizing threadpools to detect when threads are
+ // blocked. Each thread has a counter pointer, initially zero. If non-zero,
+ // the implementation atomically increments the counter when it blocks on a
+ // semaphore, a decrements it again when it wakes. This allows a threadpool
+ // to keep track of how many of its threads are blocked.
+ // SetThreadBlockedCounter() should be used only by threadpool
+ // implementations. GetThreadBlockedCounter() should be used by modules that
+ // block threads; if the pointer returned is non-zero, the location should be
+ // incremented before the thread blocks, and decremented after it wakes.
+ static void SetThreadBlockedCounter(std::atomic<int> *counter);
+ static std::atomic<int> *GetThreadBlockedCounter();
+
+ private:
+ // Create the PerThreadSem associated with "identity". Initializes count=0.
+ // REQUIRES: May only be called by ThreadIdentity.
+ static void Init(base_internal::ThreadIdentity* identity);
+
+ // Destroy the PerThreadSem associated with "identity".
+ // REQUIRES: May only be called by ThreadIdentity.
+ static void Destroy(base_internal::ThreadIdentity* identity);
+
+ // Increments "identity"'s count.
+ static inline void Post(base_internal::ThreadIdentity* identity);
+
+ // Waits until either our count > 0 or t has expired.
+ // If count > 0, decrements count and returns true. Otherwise returns false.
+ // !t.has_timeout() => Wait(t) will return true.
+ static inline bool Wait(KernelTimeout t);
+
+ // Permitted callers.
+ friend class PerThreadSemTest;
+ friend class absl::Mutex;
+ friend absl::base_internal::ThreadIdentity* CreateThreadIdentity();
+ friend void ReclaimThreadIdentity(void* v);
+};
+
+} // namespace synchronization_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+// In some build configurations we pass --detect-odr-violations to the
+// gold linker. This causes it to flag weak symbol overrides as ODR
+// violations. Because ODR only applies to C++ and not C,
+// --detect-odr-violations ignores symbols not mangled with C++ names.
+// By changing our extension points to be extern "C", we dodge this
+// check.
+extern "C" {
+void AbslInternalPerThreadSemPost(
+ absl::base_internal::ThreadIdentity* identity);
+bool AbslInternalPerThreadSemWait(
+ absl::synchronization_internal::KernelTimeout t);
+} // extern "C"
+
+void absl::synchronization_internal::PerThreadSem::Post(
+ absl::base_internal::ThreadIdentity* identity) {
+ AbslInternalPerThreadSemPost(identity);
+}
+
+bool absl::synchronization_internal::PerThreadSem::Wait(
+ absl::synchronization_internal::KernelTimeout t) {
+ return AbslInternalPerThreadSemWait(t);
+}
+
+#endif // ABSL_SYNCHRONIZATION_INTERNAL_PER_THREAD_SEM_H_
diff --git a/third_party/abseil/src/absl/synchronization/internal/per_thread_sem_test.cc b/third_party/abseil/src/absl/synchronization/internal/per_thread_sem_test.cc
new file mode 100644
index 0000000..8cf59e6
--- /dev/null
+++ b/third_party/abseil/src/absl/synchronization/internal/per_thread_sem_test.cc
@@ -0,0 +1,181 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/synchronization/internal/per_thread_sem.h"
+
+#include <atomic>
+#include <condition_variable> // NOLINT(build/c++11)
+#include <functional>
+#include <limits>
+#include <mutex> // NOLINT(build/c++11)
+#include <string>
+#include <thread> // NOLINT(build/c++11)
+
+#include "gtest/gtest.h"
+#include "absl/base/config.h"
+#include "absl/base/internal/cycleclock.h"
+#include "absl/base/internal/thread_identity.h"
+#include "absl/strings/str_cat.h"
+#include "absl/time/clock.h"
+#include "absl/time/time.h"
+
+// In this test we explicitly avoid the use of synchronization
+// primitives which might use PerThreadSem, most notably absl::Mutex.
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace synchronization_internal {
+
+class SimpleSemaphore {
+ public:
+ SimpleSemaphore() : count_(0) {}
+
+ // Decrements (locks) the semaphore. If the semaphore's value is
+ // greater than zero, then the decrement proceeds, and the function
+ // returns, immediately. If the semaphore currently has the value
+ // zero, then the call blocks until it becomes possible to perform
+ // the decrement.
+ void Wait() {
+ std::unique_lock<std::mutex> lock(mu_);
+ cv_.wait(lock, [this]() { return count_ > 0; });
+ --count_;
+ cv_.notify_one();
+ }
+
+ // Increments (unlocks) the semaphore. If the semaphore's value
+ // consequently becomes greater than zero, then another thread
+ // blocked Wait() call will be woken up and proceed to lock the
+ // semaphore.
+ void Post() {
+ std::lock_guard<std::mutex> lock(mu_);
+ ++count_;
+ cv_.notify_one();
+ }
+
+ private:
+ std::mutex mu_;
+ std::condition_variable cv_;
+ int count_;
+};
+
+struct ThreadData {
+ int num_iterations; // Number of replies to send.
+ SimpleSemaphore identity2_written; // Posted by thread writing identity2.
+ base_internal::ThreadIdentity *identity1; // First Post()-er.
+ base_internal::ThreadIdentity *identity2; // First Wait()-er.
+ KernelTimeout timeout;
+};
+
+// Need friendship with PerThreadSem.
+class PerThreadSemTest : public testing::Test {
+ public:
+ static void TimingThread(ThreadData* t) {
+ t->identity2 = GetOrCreateCurrentThreadIdentity();
+ t->identity2_written.Post();
+ while (t->num_iterations--) {
+ Wait(t->timeout);
+ Post(t->identity1);
+ }
+ }
+
+ void TestTiming(const char *msg, bool timeout) {
+ static const int kNumIterations = 100;
+ ThreadData t;
+ t.num_iterations = kNumIterations;
+ t.timeout = timeout ?
+ KernelTimeout(absl::Now() + absl::Seconds(10000)) // far in the future
+ : KernelTimeout::Never();
+ t.identity1 = GetOrCreateCurrentThreadIdentity();
+
+ // We can't use the Thread class here because it uses the Mutex
+ // class which will invoke PerThreadSem, so we use std::thread instead.
+ std::thread partner_thread(std::bind(TimingThread, &t));
+
+ // Wait for our partner thread to register their identity.
+ t.identity2_written.Wait();
+
+ int64_t min_cycles = std::numeric_limits<int64_t>::max();
+ int64_t total_cycles = 0;
+ for (int i = 0; i < kNumIterations; ++i) {
+ absl::SleepFor(absl::Milliseconds(20));
+ int64_t cycles = base_internal::CycleClock::Now();
+ Post(t.identity2);
+ Wait(t.timeout);
+ cycles = base_internal::CycleClock::Now() - cycles;
+ min_cycles = std::min(min_cycles, cycles);
+ total_cycles += cycles;
+ }
+ std::string out = StrCat(
+ msg, "min cycle count=", min_cycles, " avg cycle count=",
+ absl::SixDigits(static_cast<double>(total_cycles) / kNumIterations));
+ printf("%s\n", out.c_str());
+
+ partner_thread.join();
+ }
+
+ protected:
+ static void Post(base_internal::ThreadIdentity *id) {
+ PerThreadSem::Post(id);
+ }
+ static bool Wait(KernelTimeout t) {
+ return PerThreadSem::Wait(t);
+ }
+
+ // convenience overload
+ static bool Wait(absl::Time t) {
+ return Wait(KernelTimeout(t));
+ }
+
+ static void Tick(base_internal::ThreadIdentity *identity) {
+ PerThreadSem::Tick(identity);
+ }
+};
+
+namespace {
+
+TEST_F(PerThreadSemTest, WithoutTimeout) {
+ PerThreadSemTest::TestTiming("Without timeout: ", false);
+}
+
+TEST_F(PerThreadSemTest, WithTimeout) {
+ PerThreadSemTest::TestTiming("With timeout: ", true);
+}
+
+TEST_F(PerThreadSemTest, Timeouts) {
+ const absl::Duration delay = absl::Milliseconds(50);
+ const absl::Time start = absl::Now();
+ EXPECT_FALSE(Wait(start + delay));
+ const absl::Duration elapsed = absl::Now() - start;
+ // Allow for a slight early return, to account for quality of implementation
+ // issues on various platforms.
+ const absl::Duration slop = absl::Microseconds(200);
+ EXPECT_LE(delay - slop, elapsed)
+ << "Wait returned " << delay - elapsed
+ << " early (with " << slop << " slop), start time was " << start;
+
+ absl::Time negative_timeout = absl::UnixEpoch() - absl::Milliseconds(100);
+ EXPECT_FALSE(Wait(negative_timeout));
+ EXPECT_LE(negative_timeout, absl::Now() + slop); // trivially true :)
+
+ Post(GetOrCreateCurrentThreadIdentity());
+ // The wait here has an expired timeout, but we have a wake to consume,
+ // so this should succeed
+ EXPECT_TRUE(Wait(negative_timeout));
+}
+
+} // namespace
+
+} // namespace synchronization_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/synchronization/internal/thread_pool.h b/third_party/abseil/src/absl/synchronization/internal/thread_pool.h
new file mode 100644
index 0000000..0cb96da
--- /dev/null
+++ b/third_party/abseil/src/absl/synchronization/internal/thread_pool.h
@@ -0,0 +1,93 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_SYNCHRONIZATION_INTERNAL_THREAD_POOL_H_
+#define ABSL_SYNCHRONIZATION_INTERNAL_THREAD_POOL_H_
+
+#include <cassert>
+#include <cstddef>
+#include <functional>
+#include <queue>
+#include <thread> // NOLINT(build/c++11)
+#include <vector>
+
+#include "absl/base/thread_annotations.h"
+#include "absl/synchronization/mutex.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace synchronization_internal {
+
+// A simple ThreadPool implementation for tests.
+class ThreadPool {
+ public:
+ explicit ThreadPool(int num_threads) {
+ for (int i = 0; i < num_threads; ++i) {
+ threads_.push_back(std::thread(&ThreadPool::WorkLoop, this));
+ }
+ }
+
+ ThreadPool(const ThreadPool &) = delete;
+ ThreadPool &operator=(const ThreadPool &) = delete;
+
+ ~ThreadPool() {
+ {
+ absl::MutexLock l(&mu_);
+ for (size_t i = 0; i < threads_.size(); i++) {
+ queue_.push(nullptr); // Shutdown signal.
+ }
+ }
+ for (auto &t : threads_) {
+ t.join();
+ }
+ }
+
+ // Schedule a function to be run on a ThreadPool thread immediately.
+ void Schedule(std::function<void()> func) {
+ assert(func != nullptr);
+ absl::MutexLock l(&mu_);
+ queue_.push(std::move(func));
+ }
+
+ private:
+ bool WorkAvailable() const ABSL_EXCLUSIVE_LOCKS_REQUIRED(mu_) {
+ return !queue_.empty();
+ }
+
+ void WorkLoop() {
+ while (true) {
+ std::function<void()> func;
+ {
+ absl::MutexLock l(&mu_);
+ mu_.Await(absl::Condition(this, &ThreadPool::WorkAvailable));
+ func = std::move(queue_.front());
+ queue_.pop();
+ }
+ if (func == nullptr) { // Shutdown signal.
+ break;
+ }
+ func();
+ }
+ }
+
+ absl::Mutex mu_;
+ std::queue<std::function<void()>> queue_ ABSL_GUARDED_BY(mu_);
+ std::vector<std::thread> threads_;
+};
+
+} // namespace synchronization_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_SYNCHRONIZATION_INTERNAL_THREAD_POOL_H_
diff --git a/third_party/abseil/src/absl/synchronization/internal/waiter.cc b/third_party/abseil/src/absl/synchronization/internal/waiter.cc
new file mode 100644
index 0000000..2123be6
--- /dev/null
+++ b/third_party/abseil/src/absl/synchronization/internal/waiter.cc
@@ -0,0 +1,428 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/synchronization/internal/waiter.h"
+
+#include "absl/base/config.h"
+
+#ifdef _WIN32
+#include <windows.h>
+#else
+#include <pthread.h>
+#include <sys/time.h>
+#include <unistd.h>
+#endif
+
+#ifdef __linux__
+#include <linux/futex.h>
+#include <sys/syscall.h>
+#endif
+
+#ifdef ABSL_HAVE_SEMAPHORE_H
+#include <semaphore.h>
+#endif
+
+#include <errno.h>
+#include <stdio.h>
+#include <time.h>
+
+#include <atomic>
+#include <cassert>
+#include <cstdint>
+#include <new>
+#include <type_traits>
+
+#include "absl/base/internal/raw_logging.h"
+#include "absl/base/internal/thread_identity.h"
+#include "absl/base/optimization.h"
+#include "absl/synchronization/internal/kernel_timeout.h"
+
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace synchronization_internal {
+
+static void MaybeBecomeIdle() {
+ base_internal::ThreadIdentity *identity =
+ base_internal::CurrentThreadIdentityIfPresent();
+ assert(identity != nullptr);
+ const bool is_idle = identity->is_idle.load(std::memory_order_relaxed);
+ const int ticker = identity->ticker.load(std::memory_order_relaxed);
+ const int wait_start = identity->wait_start.load(std::memory_order_relaxed);
+ if (!is_idle && ticker - wait_start > Waiter::kIdlePeriods) {
+ identity->is_idle.store(true, std::memory_order_relaxed);
+ }
+}
+
+#if ABSL_WAITER_MODE == ABSL_WAITER_MODE_FUTEX
+
+Waiter::Waiter() {
+ futex_.store(0, std::memory_order_relaxed);
+}
+
+Waiter::~Waiter() = default;
+
+bool Waiter::Wait(KernelTimeout t) {
+ // Loop until we can atomically decrement futex from a positive
+ // value, waiting on a futex while we believe it is zero.
+ // Note that, since the thread ticker is just reset, we don't need to check
+ // whether the thread is idle on the very first pass of the loop.
+ bool first_pass = true;
+ while (true) {
+ int32_t x = futex_.load(std::memory_order_relaxed);
+ while (x != 0) {
+ if (!futex_.compare_exchange_weak(x, x - 1,
+ std::memory_order_acquire,
+ std::memory_order_relaxed)) {
+ continue; // Raced with someone, retry.
+ }
+ return true; // Consumed a wakeup, we are done.
+ }
+
+
+ if (!first_pass) MaybeBecomeIdle();
+ const int err = Futex::WaitUntil(&futex_, 0, t);
+ if (err != 0) {
+ if (err == -EINTR || err == -EWOULDBLOCK) {
+ // Do nothing, the loop will retry.
+ } else if (err == -ETIMEDOUT) {
+ return false;
+ } else {
+ ABSL_RAW_LOG(FATAL, "Futex operation failed with error %d\n", err);
+ }
+ }
+ first_pass = false;
+ }
+}
+
+void Waiter::Post() {
+ if (futex_.fetch_add(1, std::memory_order_release) == 0) {
+ // We incremented from 0, need to wake a potential waiter.
+ Poke();
+ }
+}
+
+void Waiter::Poke() {
+ // Wake one thread waiting on the futex.
+ const int err = Futex::Wake(&futex_, 1);
+ if (ABSL_PREDICT_FALSE(err < 0)) {
+ ABSL_RAW_LOG(FATAL, "Futex operation failed with error %d\n", err);
+ }
+}
+
+#elif ABSL_WAITER_MODE == ABSL_WAITER_MODE_CONDVAR
+
+class PthreadMutexHolder {
+ public:
+ explicit PthreadMutexHolder(pthread_mutex_t *mu) : mu_(mu) {
+ const int err = pthread_mutex_lock(mu_);
+ if (err != 0) {
+ ABSL_RAW_LOG(FATAL, "pthread_mutex_lock failed: %d", err);
+ }
+ }
+
+ PthreadMutexHolder(const PthreadMutexHolder &rhs) = delete;
+ PthreadMutexHolder &operator=(const PthreadMutexHolder &rhs) = delete;
+
+ ~PthreadMutexHolder() {
+ const int err = pthread_mutex_unlock(mu_);
+ if (err != 0) {
+ ABSL_RAW_LOG(FATAL, "pthread_mutex_unlock failed: %d", err);
+ }
+ }
+
+ private:
+ pthread_mutex_t *mu_;
+};
+
+Waiter::Waiter() {
+ const int err = pthread_mutex_init(&mu_, 0);
+ if (err != 0) {
+ ABSL_RAW_LOG(FATAL, "pthread_mutex_init failed: %d", err);
+ }
+
+ const int err2 = pthread_cond_init(&cv_, 0);
+ if (err2 != 0) {
+ ABSL_RAW_LOG(FATAL, "pthread_cond_init failed: %d", err2);
+ }
+
+ waiter_count_ = 0;
+ wakeup_count_ = 0;
+}
+
+Waiter::~Waiter() {
+ const int err = pthread_mutex_destroy(&mu_);
+ if (err != 0) {
+ ABSL_RAW_LOG(FATAL, "pthread_mutex_destroy failed: %d", err);
+ }
+
+ const int err2 = pthread_cond_destroy(&cv_);
+ if (err2 != 0) {
+ ABSL_RAW_LOG(FATAL, "pthread_cond_destroy failed: %d", err2);
+ }
+}
+
+bool Waiter::Wait(KernelTimeout t) {
+ struct timespec abs_timeout;
+ if (t.has_timeout()) {
+ abs_timeout = t.MakeAbsTimespec();
+ }
+
+ PthreadMutexHolder h(&mu_);
+ ++waiter_count_;
+ // Loop until we find a wakeup to consume or timeout.
+ // Note that, since the thread ticker is just reset, we don't need to check
+ // whether the thread is idle on the very first pass of the loop.
+ bool first_pass = true;
+ while (wakeup_count_ == 0) {
+ if (!first_pass) MaybeBecomeIdle();
+ // No wakeups available, time to wait.
+ if (!t.has_timeout()) {
+ const int err = pthread_cond_wait(&cv_, &mu_);
+ if (err != 0) {
+ ABSL_RAW_LOG(FATAL, "pthread_cond_wait failed: %d", err);
+ }
+ } else {
+ const int err = pthread_cond_timedwait(&cv_, &mu_, &abs_timeout);
+ if (err == ETIMEDOUT) {
+ --waiter_count_;
+ return false;
+ }
+ if (err != 0) {
+ ABSL_RAW_LOG(FATAL, "pthread_cond_timedwait failed: %d", err);
+ }
+ }
+ first_pass = false;
+ }
+ // Consume a wakeup and we're done.
+ --wakeup_count_;
+ --waiter_count_;
+ return true;
+}
+
+void Waiter::Post() {
+ PthreadMutexHolder h(&mu_);
+ ++wakeup_count_;
+ InternalCondVarPoke();
+}
+
+void Waiter::Poke() {
+ PthreadMutexHolder h(&mu_);
+ InternalCondVarPoke();
+}
+
+void Waiter::InternalCondVarPoke() {
+ if (waiter_count_ != 0) {
+ const int err = pthread_cond_signal(&cv_);
+ if (ABSL_PREDICT_FALSE(err != 0)) {
+ ABSL_RAW_LOG(FATAL, "pthread_cond_signal failed: %d", err);
+ }
+ }
+}
+
+#elif ABSL_WAITER_MODE == ABSL_WAITER_MODE_SEM
+
+Waiter::Waiter() {
+ if (sem_init(&sem_, 0, 0) != 0) {
+ ABSL_RAW_LOG(FATAL, "sem_init failed with errno %d\n", errno);
+ }
+ wakeups_.store(0, std::memory_order_relaxed);
+}
+
+Waiter::~Waiter() {
+ if (sem_destroy(&sem_) != 0) {
+ ABSL_RAW_LOG(FATAL, "sem_destroy failed with errno %d\n", errno);
+ }
+}
+
+bool Waiter::Wait(KernelTimeout t) {
+ struct timespec abs_timeout;
+ if (t.has_timeout()) {
+ abs_timeout = t.MakeAbsTimespec();
+ }
+
+ // Loop until we timeout or consume a wakeup.
+ // Note that, since the thread ticker is just reset, we don't need to check
+ // whether the thread is idle on the very first pass of the loop.
+ bool first_pass = true;
+ while (true) {
+ int x = wakeups_.load(std::memory_order_relaxed);
+ while (x != 0) {
+ if (!wakeups_.compare_exchange_weak(x, x - 1,
+ std::memory_order_acquire,
+ std::memory_order_relaxed)) {
+ continue; // Raced with someone, retry.
+ }
+ // Successfully consumed a wakeup, we're done.
+ return true;
+ }
+
+ if (!first_pass) MaybeBecomeIdle();
+ // Nothing to consume, wait (looping on EINTR).
+ while (true) {
+ if (!t.has_timeout()) {
+ if (sem_wait(&sem_) == 0) break;
+ if (errno == EINTR) continue;
+ ABSL_RAW_LOG(FATAL, "sem_wait failed: %d", errno);
+ } else {
+ if (sem_timedwait(&sem_, &abs_timeout) == 0) break;
+ if (errno == EINTR) continue;
+ if (errno == ETIMEDOUT) return false;
+ ABSL_RAW_LOG(FATAL, "sem_timedwait failed: %d", errno);
+ }
+ }
+ first_pass = false;
+ }
+}
+
+void Waiter::Post() {
+ // Post a wakeup.
+ if (wakeups_.fetch_add(1, std::memory_order_release) == 0) {
+ // We incremented from 0, need to wake a potential waiter.
+ Poke();
+ }
+}
+
+void Waiter::Poke() {
+ if (sem_post(&sem_) != 0) { // Wake any semaphore waiter.
+ ABSL_RAW_LOG(FATAL, "sem_post failed with errno %d\n", errno);
+ }
+}
+
+#elif ABSL_WAITER_MODE == ABSL_WAITER_MODE_WIN32
+
+class Waiter::WinHelper {
+ public:
+ static SRWLOCK *GetLock(Waiter *w) {
+ return reinterpret_cast<SRWLOCK *>(&w->mu_storage_);
+ }
+
+ static CONDITION_VARIABLE *GetCond(Waiter *w) {
+ return reinterpret_cast<CONDITION_VARIABLE *>(&w->cv_storage_);
+ }
+
+ static_assert(sizeof(SRWLOCK) == sizeof(void *),
+ "`mu_storage_` does not have the same size as SRWLOCK");
+ static_assert(alignof(SRWLOCK) == alignof(void *),
+ "`mu_storage_` does not have the same alignment as SRWLOCK");
+
+ static_assert(sizeof(CONDITION_VARIABLE) == sizeof(void *),
+ "`ABSL_CONDITION_VARIABLE_STORAGE` does not have the same size "
+ "as `CONDITION_VARIABLE`");
+ static_assert(
+ alignof(CONDITION_VARIABLE) == alignof(void *),
+ "`cv_storage_` does not have the same alignment as `CONDITION_VARIABLE`");
+
+ // The SRWLOCK and CONDITION_VARIABLE types must be trivially constructible
+ // and destructible because we never call their constructors or destructors.
+ static_assert(std::is_trivially_constructible<SRWLOCK>::value,
+ "The `SRWLOCK` type must be trivially constructible");
+ static_assert(
+ std::is_trivially_constructible<CONDITION_VARIABLE>::value,
+ "The `CONDITION_VARIABLE` type must be trivially constructible");
+ static_assert(std::is_trivially_destructible<SRWLOCK>::value,
+ "The `SRWLOCK` type must be trivially destructible");
+ static_assert(std::is_trivially_destructible<CONDITION_VARIABLE>::value,
+ "The `CONDITION_VARIABLE` type must be trivially destructible");
+};
+
+class LockHolder {
+ public:
+ explicit LockHolder(SRWLOCK* mu) : mu_(mu) {
+ AcquireSRWLockExclusive(mu_);
+ }
+
+ LockHolder(const LockHolder&) = delete;
+ LockHolder& operator=(const LockHolder&) = delete;
+
+ ~LockHolder() {
+ ReleaseSRWLockExclusive(mu_);
+ }
+
+ private:
+ SRWLOCK* mu_;
+};
+
+Waiter::Waiter() {
+ auto *mu = ::new (static_cast<void *>(&mu_storage_)) SRWLOCK;
+ auto *cv = ::new (static_cast<void *>(&cv_storage_)) CONDITION_VARIABLE;
+ InitializeSRWLock(mu);
+ InitializeConditionVariable(cv);
+ waiter_count_ = 0;
+ wakeup_count_ = 0;
+}
+
+// SRW locks and condition variables do not need to be explicitly destroyed.
+// https://docs.microsoft.com/en-us/windows/win32/api/synchapi/nf-synchapi-initializesrwlock
+// https://stackoverflow.com/questions/28975958/why-does-windows-have-no-deleteconditionvariable-function-to-go-together-with
+Waiter::~Waiter() = default;
+
+bool Waiter::Wait(KernelTimeout t) {
+ SRWLOCK *mu = WinHelper::GetLock(this);
+ CONDITION_VARIABLE *cv = WinHelper::GetCond(this);
+
+ LockHolder h(mu);
+ ++waiter_count_;
+
+ // Loop until we find a wakeup to consume or timeout.
+ // Note that, since the thread ticker is just reset, we don't need to check
+ // whether the thread is idle on the very first pass of the loop.
+ bool first_pass = true;
+ while (wakeup_count_ == 0) {
+ if (!first_pass) MaybeBecomeIdle();
+ // No wakeups available, time to wait.
+ if (!SleepConditionVariableSRW(cv, mu, t.InMillisecondsFromNow(), 0)) {
+ // GetLastError() returns a Win32 DWORD, but we assign to
+ // unsigned long to simplify the ABSL_RAW_LOG case below. The uniform
+ // initialization guarantees this is not a narrowing conversion.
+ const unsigned long err{GetLastError()}; // NOLINT(runtime/int)
+ if (err == ERROR_TIMEOUT) {
+ --waiter_count_;
+ return false;
+ } else {
+ ABSL_RAW_LOG(FATAL, "SleepConditionVariableSRW failed: %lu", err);
+ }
+ }
+ first_pass = false;
+ }
+ // Consume a wakeup and we're done.
+ --wakeup_count_;
+ --waiter_count_;
+ return true;
+}
+
+void Waiter::Post() {
+ LockHolder h(WinHelper::GetLock(this));
+ ++wakeup_count_;
+ InternalCondVarPoke();
+}
+
+void Waiter::Poke() {
+ LockHolder h(WinHelper::GetLock(this));
+ InternalCondVarPoke();
+}
+
+void Waiter::InternalCondVarPoke() {
+ if (waiter_count_ != 0) {
+ WakeConditionVariable(WinHelper::GetCond(this));
+ }
+}
+
+#else
+#error Unknown ABSL_WAITER_MODE
+#endif
+
+} // namespace synchronization_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/synchronization/internal/waiter.h b/third_party/abseil/src/absl/synchronization/internal/waiter.h
new file mode 100644
index 0000000..be3df18
--- /dev/null
+++ b/third_party/abseil/src/absl/synchronization/internal/waiter.h
@@ -0,0 +1,155 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+#ifndef ABSL_SYNCHRONIZATION_INTERNAL_WAITER_H_
+#define ABSL_SYNCHRONIZATION_INTERNAL_WAITER_H_
+
+#include "absl/base/config.h"
+
+#ifdef _WIN32
+#include <sdkddkver.h>
+#else
+#include <pthread.h>
+#endif
+
+#ifdef __linux__
+#include <linux/futex.h>
+#endif
+
+#ifdef ABSL_HAVE_SEMAPHORE_H
+#include <semaphore.h>
+#endif
+
+#include <atomic>
+#include <cstdint>
+
+#include "absl/base/internal/thread_identity.h"
+#include "absl/synchronization/internal/futex.h"
+#include "absl/synchronization/internal/kernel_timeout.h"
+
+// May be chosen at compile time via -DABSL_FORCE_WAITER_MODE=<index>
+#define ABSL_WAITER_MODE_FUTEX 0
+#define ABSL_WAITER_MODE_SEM 1
+#define ABSL_WAITER_MODE_CONDVAR 2
+#define ABSL_WAITER_MODE_WIN32 3
+
+#if defined(ABSL_FORCE_WAITER_MODE)
+#define ABSL_WAITER_MODE ABSL_FORCE_WAITER_MODE
+#elif defined(_WIN32) && _WIN32_WINNT >= _WIN32_WINNT_VISTA
+#define ABSL_WAITER_MODE ABSL_WAITER_MODE_WIN32
+#elif defined(ABSL_INTERNAL_HAVE_FUTEX)
+#define ABSL_WAITER_MODE ABSL_WAITER_MODE_FUTEX
+#elif defined(ABSL_HAVE_SEMAPHORE_H)
+#define ABSL_WAITER_MODE ABSL_WAITER_MODE_SEM
+#else
+#define ABSL_WAITER_MODE ABSL_WAITER_MODE_CONDVAR
+#endif
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace synchronization_internal {
+
+// Waiter is an OS-specific semaphore.
+class Waiter {
+ public:
+ // Prepare any data to track waits.
+ Waiter();
+
+ // Not copyable or movable
+ Waiter(const Waiter&) = delete;
+ Waiter& operator=(const Waiter&) = delete;
+
+ // Destroy any data to track waits.
+ ~Waiter();
+
+ // Blocks the calling thread until a matching call to `Post()` or
+ // `t` has passed. Returns `true` if woken (`Post()` called),
+ // `false` on timeout.
+ bool Wait(KernelTimeout t);
+
+ // Restart the caller of `Wait()` as with a normal semaphore.
+ void Post();
+
+ // If anyone is waiting, wake them up temporarily and cause them to
+ // call `MaybeBecomeIdle()`. They will then return to waiting for a
+ // `Post()` or timeout.
+ void Poke();
+
+ // Returns the Waiter associated with the identity.
+ static Waiter* GetWaiter(base_internal::ThreadIdentity* identity) {
+ static_assert(
+ sizeof(Waiter) <= sizeof(base_internal::ThreadIdentity::WaiterState),
+ "Insufficient space for Waiter");
+ return reinterpret_cast<Waiter*>(identity->waiter_state.data);
+ }
+
+ // How many periods to remain idle before releasing resources
+#ifndef ABSL_HAVE_THREAD_SANITIZER
+ static constexpr int kIdlePeriods = 60;
+#else
+ // Memory consumption under ThreadSanitizer is a serious concern,
+ // so we release resources sooner. The value of 1 leads to 1 to 2 second
+ // delay before marking a thread as idle.
+ static const int kIdlePeriods = 1;
+#endif
+
+ private:
+#if ABSL_WAITER_MODE == ABSL_WAITER_MODE_FUTEX
+ // Futexes are defined by specification to be 32-bits.
+ // Thus std::atomic<int32_t> must be just an int32_t with lockfree methods.
+ std::atomic<int32_t> futex_;
+ static_assert(sizeof(int32_t) == sizeof(futex_), "Wrong size for futex");
+
+#elif ABSL_WAITER_MODE == ABSL_WAITER_MODE_CONDVAR
+ // REQUIRES: mu_ must be held.
+ void InternalCondVarPoke();
+
+ pthread_mutex_t mu_;
+ pthread_cond_t cv_;
+ int waiter_count_;
+ int wakeup_count_; // Unclaimed wakeups.
+
+#elif ABSL_WAITER_MODE == ABSL_WAITER_MODE_SEM
+ sem_t sem_;
+ // This seems superfluous, but for Poke() we need to cause spurious
+ // wakeups on the semaphore. Hence we can't actually use the
+ // semaphore's count.
+ std::atomic<int> wakeups_;
+
+#elif ABSL_WAITER_MODE == ABSL_WAITER_MODE_WIN32
+ // WinHelper - Used to define utilities for accessing the lock and
+ // condition variable storage once the types are complete.
+ class WinHelper;
+
+ // REQUIRES: WinHelper::GetLock(this) must be held.
+ void InternalCondVarPoke();
+
+ // We can't include Windows.h in our headers, so we use aligned charachter
+ // buffers to define the storage of SRWLOCK and CONDITION_VARIABLE.
+ alignas(void*) unsigned char mu_storage_[sizeof(void*)];
+ alignas(void*) unsigned char cv_storage_[sizeof(void*)];
+ int waiter_count_;
+ int wakeup_count_;
+
+#else
+ #error Unknown ABSL_WAITER_MODE
+#endif
+};
+
+} // namespace synchronization_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_SYNCHRONIZATION_INTERNAL_WAITER_H_
diff --git a/third_party/abseil/src/absl/synchronization/lifetime_test.cc b/third_party/abseil/src/absl/synchronization/lifetime_test.cc
new file mode 100644
index 0000000..cc973a3
--- /dev/null
+++ b/third_party/abseil/src/absl/synchronization/lifetime_test.cc
@@ -0,0 +1,181 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <cstdlib>
+#include <thread> // NOLINT(build/c++11), Abseil test
+#include <type_traits>
+
+#include "absl/base/attributes.h"
+#include "absl/base/const_init.h"
+#include "absl/base/internal/raw_logging.h"
+#include "absl/base/thread_annotations.h"
+#include "absl/synchronization/mutex.h"
+#include "absl/synchronization/notification.h"
+
+namespace {
+
+// A two-threaded test which checks that Mutex, CondVar, and Notification have
+// correct basic functionality. The intent is to establish that they
+// function correctly in various phases of construction and destruction.
+//
+// Thread one acquires a lock on 'mutex', wakes thread two via 'notification',
+// then waits for 'state' to be set, as signalled by 'condvar'.
+//
+// Thread two waits on 'notification', then sets 'state' inside the 'mutex',
+// signalling the change via 'condvar'.
+//
+// These tests use ABSL_RAW_CHECK to validate invariants, rather than EXPECT or
+// ASSERT from gUnit, because we need to invoke them during global destructors,
+// when gUnit teardown would have already begun.
+void ThreadOne(absl::Mutex* mutex, absl::CondVar* condvar,
+ absl::Notification* notification, bool* state) {
+ // Test that the notification is in a valid initial state.
+ ABSL_RAW_CHECK(!notification->HasBeenNotified(), "invalid Notification");
+ ABSL_RAW_CHECK(*state == false, "*state not initialized");
+
+ {
+ absl::MutexLock lock(mutex);
+
+ notification->Notify();
+ ABSL_RAW_CHECK(notification->HasBeenNotified(), "invalid Notification");
+
+ while (*state == false) {
+ condvar->Wait(mutex);
+ }
+ }
+}
+
+void ThreadTwo(absl::Mutex* mutex, absl::CondVar* condvar,
+ absl::Notification* notification, bool* state) {
+ ABSL_RAW_CHECK(*state == false, "*state not initialized");
+
+ // Wake thread one
+ notification->WaitForNotification();
+ ABSL_RAW_CHECK(notification->HasBeenNotified(), "invalid Notification");
+ {
+ absl::MutexLock lock(mutex);
+ *state = true;
+ condvar->Signal();
+ }
+}
+
+// Launch thread 1 and thread 2, and block on their completion.
+// If any of 'mutex', 'condvar', or 'notification' is nullptr, use a locally
+// constructed instance instead.
+void RunTests(absl::Mutex* mutex, absl::CondVar* condvar) {
+ absl::Mutex default_mutex;
+ absl::CondVar default_condvar;
+ absl::Notification notification;
+ if (!mutex) {
+ mutex = &default_mutex;
+ }
+ if (!condvar) {
+ condvar = &default_condvar;
+ }
+ bool state = false;
+ std::thread thread_one(ThreadOne, mutex, condvar, ¬ification, &state);
+ std::thread thread_two(ThreadTwo, mutex, condvar, ¬ification, &state);
+ thread_one.join();
+ thread_two.join();
+}
+
+void TestLocals() {
+ absl::Mutex mutex;
+ absl::CondVar condvar;
+ RunTests(&mutex, &condvar);
+}
+
+// Normal kConstInit usage
+ABSL_CONST_INIT absl::Mutex const_init_mutex(absl::kConstInit);
+void TestConstInitGlobal() { RunTests(&const_init_mutex, nullptr); }
+
+// Global variables during start and termination
+//
+// In a translation unit, static storage duration variables are initialized in
+// the order of their definitions, and destroyed in the reverse order of their
+// definitions. We can use this to arrange for tests to be run on these objects
+// before they are created, and after they are destroyed.
+
+using Function = void (*)();
+
+class OnConstruction {
+ public:
+ explicit OnConstruction(Function fn) { fn(); }
+};
+
+class OnDestruction {
+ public:
+ explicit OnDestruction(Function fn) : fn_(fn) {}
+ ~OnDestruction() { fn_(); }
+ private:
+ Function fn_;
+};
+
+// These tests require that the compiler correctly supports C++11 constant
+// initialization... but MSVC has a known regression since v19.10:
+// https://developercommunity.visualstudio.com/content/problem/336946/class-with-constexpr-constructor-not-using-static.html
+// TODO(epastor): Limit the affected range once MSVC fixes this bug.
+#if defined(__clang__) || !(defined(_MSC_VER) && _MSC_VER > 1900)
+// kConstInit
+// Test early usage. (Declaration comes first; definitions must appear after
+// the test runner.)
+extern absl::Mutex early_const_init_mutex;
+// (Normally I'd write this +[], to make the cast-to-function-pointer explicit,
+// but in some MSVC setups we support, lambdas provide conversion operators to
+// different flavors of function pointers, making this trick ambiguous.)
+OnConstruction test_early_const_init([] {
+ RunTests(&early_const_init_mutex, nullptr);
+});
+// This definition appears before test_early_const_init, but it should be
+// initialized first (due to constant initialization). Test that the object
+// actually works when constructed this way.
+ABSL_CONST_INIT absl::Mutex early_const_init_mutex(absl::kConstInit);
+
+// Furthermore, test that the const-init c'tor doesn't stomp over the state of
+// a Mutex. Really, this is a test that the platform under test correctly
+// supports C++11 constant initialization. (The constant-initialization
+// constructors of globals "happen at link time"; memory is pre-initialized,
+// before the constructors of either grab_lock or check_still_locked are run.)
+extern absl::Mutex const_init_sanity_mutex;
+OnConstruction grab_lock([]() ABSL_NO_THREAD_SAFETY_ANALYSIS {
+ const_init_sanity_mutex.Lock();
+});
+ABSL_CONST_INIT absl::Mutex const_init_sanity_mutex(absl::kConstInit);
+OnConstruction check_still_locked([]() ABSL_NO_THREAD_SAFETY_ANALYSIS {
+ const_init_sanity_mutex.AssertHeld();
+ const_init_sanity_mutex.Unlock();
+});
+#endif // defined(__clang__) || !(defined(_MSC_VER) && _MSC_VER > 1900)
+
+// Test shutdown usage. (Declarations come first; definitions must appear after
+// the test runner.)
+extern absl::Mutex late_const_init_mutex;
+// OnDestruction is being used here as a global variable, even though it has a
+// non-trivial destructor. This is against the style guide. We're violating
+// that rule here to check that the exception we allow for kConstInit is safe.
+// NOLINTNEXTLINE
+OnDestruction test_late_const_init([] {
+ RunTests(&late_const_init_mutex, nullptr);
+});
+ABSL_CONST_INIT absl::Mutex late_const_init_mutex(absl::kConstInit);
+
+} // namespace
+
+int main() {
+ TestLocals();
+ TestConstInitGlobal();
+ // Explicitly call exit(0) here, to make it clear that we intend for the
+ // above global object destructors to run.
+ std::exit(0);
+}
diff --git a/third_party/abseil/src/absl/synchronization/mutex.cc b/third_party/abseil/src/absl/synchronization/mutex.cc
new file mode 100644
index 0000000..9e01393
--- /dev/null
+++ b/third_party/abseil/src/absl/synchronization/mutex.cc
@@ -0,0 +1,2740 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/synchronization/mutex.h"
+
+#ifdef _WIN32
+#include <windows.h>
+#ifdef ERROR
+#undef ERROR
+#endif
+#else
+#include <fcntl.h>
+#include <pthread.h>
+#include <sched.h>
+#include <sys/time.h>
+#endif
+
+#include <assert.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+
+#include <algorithm>
+#include <atomic>
+#include <cinttypes>
+#include <thread> // NOLINT(build/c++11)
+
+#include "absl/base/attributes.h"
+#include "absl/base/call_once.h"
+#include "absl/base/config.h"
+#include "absl/base/dynamic_annotations.h"
+#include "absl/base/internal/atomic_hook.h"
+#include "absl/base/internal/cycleclock.h"
+#include "absl/base/internal/hide_ptr.h"
+#include "absl/base/internal/low_level_alloc.h"
+#include "absl/base/internal/raw_logging.h"
+#include "absl/base/internal/spinlock.h"
+#include "absl/base/internal/sysinfo.h"
+#include "absl/base/internal/thread_identity.h"
+#include "absl/base/internal/tsan_mutex_interface.h"
+#include "absl/base/port.h"
+#include "absl/debugging/stacktrace.h"
+#include "absl/debugging/symbolize.h"
+#include "absl/synchronization/internal/graphcycles.h"
+#include "absl/synchronization/internal/per_thread_sem.h"
+#include "absl/time/time.h"
+
+using absl::base_internal::CurrentThreadIdentityIfPresent;
+using absl::base_internal::PerThreadSynch;
+using absl::base_internal::SchedulingGuard;
+using absl::base_internal::ThreadIdentity;
+using absl::synchronization_internal::GetOrCreateCurrentThreadIdentity;
+using absl::synchronization_internal::GraphCycles;
+using absl::synchronization_internal::GraphId;
+using absl::synchronization_internal::InvalidGraphId;
+using absl::synchronization_internal::KernelTimeout;
+using absl::synchronization_internal::PerThreadSem;
+
+extern "C" {
+ABSL_ATTRIBUTE_WEAK void AbslInternalMutexYield() { std::this_thread::yield(); }
+} // extern "C"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+namespace {
+
+#if defined(ABSL_HAVE_THREAD_SANITIZER)
+constexpr OnDeadlockCycle kDeadlockDetectionDefault = OnDeadlockCycle::kIgnore;
+#else
+constexpr OnDeadlockCycle kDeadlockDetectionDefault = OnDeadlockCycle::kAbort;
+#endif
+
+ABSL_CONST_INIT std::atomic<OnDeadlockCycle> synch_deadlock_detection(
+ kDeadlockDetectionDefault);
+ABSL_CONST_INIT std::atomic<bool> synch_check_invariants(false);
+
+ABSL_INTERNAL_ATOMIC_HOOK_ATTRIBUTES
+absl::base_internal::AtomicHook<void (*)(int64_t wait_cycles)>
+ submit_profile_data;
+ABSL_INTERNAL_ATOMIC_HOOK_ATTRIBUTES absl::base_internal::AtomicHook<void (*)(
+ const char *msg, const void *obj, int64_t wait_cycles)>
+ mutex_tracer;
+ABSL_INTERNAL_ATOMIC_HOOK_ATTRIBUTES
+ absl::base_internal::AtomicHook<void (*)(const char *msg, const void *cv)>
+ cond_var_tracer;
+ABSL_INTERNAL_ATOMIC_HOOK_ATTRIBUTES absl::base_internal::AtomicHook<
+ bool (*)(const void *pc, char *out, int out_size)>
+ symbolizer(absl::Symbolize);
+
+} // namespace
+
+static inline bool EvalConditionAnnotated(const Condition *cond, Mutex *mu,
+ bool locking, bool trylock,
+ bool read_lock);
+
+void RegisterMutexProfiler(void (*fn)(int64_t wait_timestamp)) {
+ submit_profile_data.Store(fn);
+}
+
+void RegisterMutexTracer(void (*fn)(const char *msg, const void *obj,
+ int64_t wait_cycles)) {
+ mutex_tracer.Store(fn);
+}
+
+void RegisterCondVarTracer(void (*fn)(const char *msg, const void *cv)) {
+ cond_var_tracer.Store(fn);
+}
+
+void RegisterSymbolizer(bool (*fn)(const void *pc, char *out, int out_size)) {
+ symbolizer.Store(fn);
+}
+
+struct ABSL_CACHELINE_ALIGNED MutexGlobals {
+ absl::once_flag once;
+ int num_cpus = 0;
+ int spinloop_iterations = 0;
+};
+
+static const MutexGlobals& GetMutexGlobals() {
+ ABSL_CONST_INIT static MutexGlobals data;
+ absl::base_internal::LowLevelCallOnce(&data.once, [&]() {
+ data.num_cpus = absl::base_internal::NumCPUs();
+ data.spinloop_iterations = data.num_cpus > 1 ? 1500 : 0;
+ });
+ return data;
+}
+
+// Spinlock delay on iteration c. Returns new c.
+namespace {
+ enum DelayMode { AGGRESSIVE, GENTLE };
+};
+
+namespace synchronization_internal {
+int MutexDelay(int32_t c, int mode) {
+ // If this a uniprocessor, only yield/sleep. Otherwise, if the mode is
+ // aggressive then spin many times before yielding. If the mode is
+ // gentle then spin only a few times before yielding. Aggressive spinning is
+ // used to ensure that an Unlock() call, which must get the spin lock for
+ // any thread to make progress gets it without undue delay.
+ const int32_t limit =
+ GetMutexGlobals().num_cpus > 1 ? (mode == AGGRESSIVE ? 5000 : 250) : 0;
+ if (c < limit) {
+ // Spin.
+ c++;
+ } else {
+ SchedulingGuard::ScopedEnable enable_rescheduling;
+ ABSL_TSAN_MUTEX_PRE_DIVERT(nullptr, 0);
+ if (c == limit) {
+ // Yield once.
+ AbslInternalMutexYield();
+ c++;
+ } else {
+ // Then wait.
+ absl::SleepFor(absl::Microseconds(10));
+ c = 0;
+ }
+ ABSL_TSAN_MUTEX_POST_DIVERT(nullptr, 0);
+ }
+ return c;
+}
+} // namespace synchronization_internal
+
+// --------------------------Generic atomic ops
+// Ensure that "(*pv & bits) == bits" by doing an atomic update of "*pv" to
+// "*pv | bits" if necessary. Wait until (*pv & wait_until_clear)==0
+// before making any change.
+// This is used to set flags in mutex and condition variable words.
+static void AtomicSetBits(std::atomic<intptr_t>* pv, intptr_t bits,
+ intptr_t wait_until_clear) {
+ intptr_t v;
+ do {
+ v = pv->load(std::memory_order_relaxed);
+ } while ((v & bits) != bits &&
+ ((v & wait_until_clear) != 0 ||
+ !pv->compare_exchange_weak(v, v | bits,
+ std::memory_order_release,
+ std::memory_order_relaxed)));
+}
+
+// Ensure that "(*pv & bits) == 0" by doing an atomic update of "*pv" to
+// "*pv & ~bits" if necessary. Wait until (*pv & wait_until_clear)==0
+// before making any change.
+// This is used to unset flags in mutex and condition variable words.
+static void AtomicClearBits(std::atomic<intptr_t>* pv, intptr_t bits,
+ intptr_t wait_until_clear) {
+ intptr_t v;
+ do {
+ v = pv->load(std::memory_order_relaxed);
+ } while ((v & bits) != 0 &&
+ ((v & wait_until_clear) != 0 ||
+ !pv->compare_exchange_weak(v, v & ~bits,
+ std::memory_order_release,
+ std::memory_order_relaxed)));
+}
+
+//------------------------------------------------------------------
+
+// Data for doing deadlock detection.
+ABSL_CONST_INIT static absl::base_internal::SpinLock deadlock_graph_mu(
+ absl::kConstInit, base_internal::SCHEDULE_KERNEL_ONLY);
+
+// Graph used to detect deadlocks.
+ABSL_CONST_INIT static GraphCycles *deadlock_graph
+ ABSL_GUARDED_BY(deadlock_graph_mu) ABSL_PT_GUARDED_BY(deadlock_graph_mu);
+
+//------------------------------------------------------------------
+// An event mechanism for debugging mutex use.
+// It also allows mutexes to be given names for those who can't handle
+// addresses, and instead like to give their data structures names like
+// "Henry", "Fido", or "Rupert IV, King of Yondavia".
+
+namespace { // to prevent name pollution
+enum { // Mutex and CondVar events passed as "ev" to PostSynchEvent
+ // Mutex events
+ SYNCH_EV_TRYLOCK_SUCCESS,
+ SYNCH_EV_TRYLOCK_FAILED,
+ SYNCH_EV_READERTRYLOCK_SUCCESS,
+ SYNCH_EV_READERTRYLOCK_FAILED,
+ SYNCH_EV_LOCK,
+ SYNCH_EV_LOCK_RETURNING,
+ SYNCH_EV_READERLOCK,
+ SYNCH_EV_READERLOCK_RETURNING,
+ SYNCH_EV_UNLOCK,
+ SYNCH_EV_READERUNLOCK,
+
+ // CondVar events
+ SYNCH_EV_WAIT,
+ SYNCH_EV_WAIT_RETURNING,
+ SYNCH_EV_SIGNAL,
+ SYNCH_EV_SIGNALALL,
+};
+
+enum { // Event flags
+ SYNCH_F_R = 0x01, // reader event
+ SYNCH_F_LCK = 0x02, // PostSynchEvent called with mutex held
+ SYNCH_F_TRY = 0x04, // TryLock or ReaderTryLock
+ SYNCH_F_UNLOCK = 0x08, // Unlock or ReaderUnlock
+
+ SYNCH_F_LCK_W = SYNCH_F_LCK,
+ SYNCH_F_LCK_R = SYNCH_F_LCK | SYNCH_F_R,
+};
+} // anonymous namespace
+
+// Properties of the events.
+static const struct {
+ int flags;
+ const char *msg;
+} event_properties[] = {
+ {SYNCH_F_LCK_W | SYNCH_F_TRY, "TryLock succeeded "},
+ {0, "TryLock failed "},
+ {SYNCH_F_LCK_R | SYNCH_F_TRY, "ReaderTryLock succeeded "},
+ {0, "ReaderTryLock failed "},
+ {0, "Lock blocking "},
+ {SYNCH_F_LCK_W, "Lock returning "},
+ {0, "ReaderLock blocking "},
+ {SYNCH_F_LCK_R, "ReaderLock returning "},
+ {SYNCH_F_LCK_W | SYNCH_F_UNLOCK, "Unlock "},
+ {SYNCH_F_LCK_R | SYNCH_F_UNLOCK, "ReaderUnlock "},
+ {0, "Wait on "},
+ {0, "Wait unblocked "},
+ {0, "Signal on "},
+ {0, "SignalAll on "},
+};
+
+ABSL_CONST_INIT static absl::base_internal::SpinLock synch_event_mu(
+ absl::kConstInit, base_internal::SCHEDULE_KERNEL_ONLY);
+
+// Hash table size; should be prime > 2.
+// Can't be too small, as it's used for deadlock detection information.
+static constexpr uint32_t kNSynchEvent = 1031;
+
+static struct SynchEvent { // this is a trivial hash table for the events
+ // struct is freed when refcount reaches 0
+ int refcount ABSL_GUARDED_BY(synch_event_mu);
+
+ // buckets have linear, 0-terminated chains
+ SynchEvent *next ABSL_GUARDED_BY(synch_event_mu);
+
+ // Constant after initialization
+ uintptr_t masked_addr; // object at this address is called "name"
+
+ // No explicit synchronization used. Instead we assume that the
+ // client who enables/disables invariants/logging on a Mutex does so
+ // while the Mutex is not being concurrently accessed by others.
+ void (*invariant)(void *arg); // called on each event
+ void *arg; // first arg to (*invariant)()
+ bool log; // logging turned on
+
+ // Constant after initialization
+ char name[1]; // actually longer---NUL-terminated string
+} * synch_event[kNSynchEvent] ABSL_GUARDED_BY(synch_event_mu);
+
+// Ensure that the object at "addr" has a SynchEvent struct associated with it,
+// set "bits" in the word there (waiting until lockbit is clear before doing
+// so), and return a refcounted reference that will remain valid until
+// UnrefSynchEvent() is called. If a new SynchEvent is allocated,
+// the string name is copied into it.
+// When used with a mutex, the caller should also ensure that kMuEvent
+// is set in the mutex word, and similarly for condition variables and kCVEvent.
+static SynchEvent *EnsureSynchEvent(std::atomic<intptr_t> *addr,
+ const char *name, intptr_t bits,
+ intptr_t lockbit) {
+ uint32_t h = reinterpret_cast<intptr_t>(addr) % kNSynchEvent;
+ SynchEvent *e;
+ // first look for existing SynchEvent struct..
+ synch_event_mu.Lock();
+ for (e = synch_event[h];
+ e != nullptr && e->masked_addr != base_internal::HidePtr(addr);
+ e = e->next) {
+ }
+ if (e == nullptr) { // no SynchEvent struct found; make one.
+ if (name == nullptr) {
+ name = "";
+ }
+ size_t l = strlen(name);
+ e = reinterpret_cast<SynchEvent *>(
+ base_internal::LowLevelAlloc::Alloc(sizeof(*e) + l));
+ e->refcount = 2; // one for return value, one for linked list
+ e->masked_addr = base_internal::HidePtr(addr);
+ e->invariant = nullptr;
+ e->arg = nullptr;
+ e->log = false;
+ strcpy(e->name, name); // NOLINT(runtime/printf)
+ e->next = synch_event[h];
+ AtomicSetBits(addr, bits, lockbit);
+ synch_event[h] = e;
+ } else {
+ e->refcount++; // for return value
+ }
+ synch_event_mu.Unlock();
+ return e;
+}
+
+// Deallocate the SynchEvent *e, whose refcount has fallen to zero.
+static void DeleteSynchEvent(SynchEvent *e) {
+ base_internal::LowLevelAlloc::Free(e);
+}
+
+// Decrement the reference count of *e, or do nothing if e==null.
+static void UnrefSynchEvent(SynchEvent *e) {
+ if (e != nullptr) {
+ synch_event_mu.Lock();
+ bool del = (--(e->refcount) == 0);
+ synch_event_mu.Unlock();
+ if (del) {
+ DeleteSynchEvent(e);
+ }
+ }
+}
+
+// Forget the mapping from the object (Mutex or CondVar) at address addr
+// to SynchEvent object, and clear "bits" in its word (waiting until lockbit
+// is clear before doing so).
+static void ForgetSynchEvent(std::atomic<intptr_t> *addr, intptr_t bits,
+ intptr_t lockbit) {
+ uint32_t h = reinterpret_cast<intptr_t>(addr) % kNSynchEvent;
+ SynchEvent **pe;
+ SynchEvent *e;
+ synch_event_mu.Lock();
+ for (pe = &synch_event[h];
+ (e = *pe) != nullptr && e->masked_addr != base_internal::HidePtr(addr);
+ pe = &e->next) {
+ }
+ bool del = false;
+ if (e != nullptr) {
+ *pe = e->next;
+ del = (--(e->refcount) == 0);
+ }
+ AtomicClearBits(addr, bits, lockbit);
+ synch_event_mu.Unlock();
+ if (del) {
+ DeleteSynchEvent(e);
+ }
+}
+
+// Return a refcounted reference to the SynchEvent of the object at address
+// "addr", if any. The pointer returned is valid until the UnrefSynchEvent() is
+// called.
+static SynchEvent *GetSynchEvent(const void *addr) {
+ uint32_t h = reinterpret_cast<intptr_t>(addr) % kNSynchEvent;
+ SynchEvent *e;
+ synch_event_mu.Lock();
+ for (e = synch_event[h];
+ e != nullptr && e->masked_addr != base_internal::HidePtr(addr);
+ e = e->next) {
+ }
+ if (e != nullptr) {
+ e->refcount++;
+ }
+ synch_event_mu.Unlock();
+ return e;
+}
+
+// Called when an event "ev" occurs on a Mutex of CondVar "obj"
+// if event recording is on
+static void PostSynchEvent(void *obj, int ev) {
+ SynchEvent *e = GetSynchEvent(obj);
+ // logging is on if event recording is on and either there's no event struct,
+ // or it explicitly says to log
+ if (e == nullptr || e->log) {
+ void *pcs[40];
+ int n = absl::GetStackTrace(pcs, ABSL_ARRAYSIZE(pcs), 1);
+ // A buffer with enough space for the ASCII for all the PCs, even on a
+ // 64-bit machine.
+ char buffer[ABSL_ARRAYSIZE(pcs) * 24];
+ int pos = snprintf(buffer, sizeof (buffer), " @");
+ for (int i = 0; i != n; i++) {
+ pos += snprintf(&buffer[pos], sizeof (buffer) - pos, " %p", pcs[i]);
+ }
+ ABSL_RAW_LOG(INFO, "%s%p %s %s", event_properties[ev].msg, obj,
+ (e == nullptr ? "" : e->name), buffer);
+ }
+ const int flags = event_properties[ev].flags;
+ if ((flags & SYNCH_F_LCK) != 0 && e != nullptr && e->invariant != nullptr) {
+ // Calling the invariant as is causes problems under ThreadSanitizer.
+ // We are currently inside of Mutex Lock/Unlock and are ignoring all
+ // memory accesses and synchronization. If the invariant transitively
+ // synchronizes something else and we ignore the synchronization, we will
+ // get false positive race reports later.
+ // Reuse EvalConditionAnnotated to properly call into user code.
+ struct local {
+ static bool pred(SynchEvent *ev) {
+ (*ev->invariant)(ev->arg);
+ return false;
+ }
+ };
+ Condition cond(&local::pred, e);
+ Mutex *mu = static_cast<Mutex *>(obj);
+ const bool locking = (flags & SYNCH_F_UNLOCK) == 0;
+ const bool trylock = (flags & SYNCH_F_TRY) != 0;
+ const bool read_lock = (flags & SYNCH_F_R) != 0;
+ EvalConditionAnnotated(&cond, mu, locking, trylock, read_lock);
+ }
+ UnrefSynchEvent(e);
+}
+
+//------------------------------------------------------------------
+
+// The SynchWaitParams struct encapsulates the way in which a thread is waiting:
+// whether it has a timeout, the condition, exclusive/shared, and whether a
+// condition variable wait has an associated Mutex (as opposed to another
+// type of lock). It also points to the PerThreadSynch struct of its thread.
+// cv_word tells Enqueue() to enqueue on a CondVar using CondVarEnqueue().
+//
+// This structure is held on the stack rather than directly in
+// PerThreadSynch because a thread can be waiting on multiple Mutexes if,
+// while waiting on one Mutex, the implementation calls a client callback
+// (such as a Condition function) that acquires another Mutex. We don't
+// strictly need to allow this, but programmers become confused if we do not
+// allow them to use functions such a LOG() within Condition functions. The
+// PerThreadSynch struct points at the most recent SynchWaitParams struct when
+// the thread is on a Mutex's waiter queue.
+struct SynchWaitParams {
+ SynchWaitParams(Mutex::MuHow how_arg, const Condition *cond_arg,
+ KernelTimeout timeout_arg, Mutex *cvmu_arg,
+ PerThreadSynch *thread_arg,
+ std::atomic<intptr_t> *cv_word_arg)
+ : how(how_arg),
+ cond(cond_arg),
+ timeout(timeout_arg),
+ cvmu(cvmu_arg),
+ thread(thread_arg),
+ cv_word(cv_word_arg),
+ contention_start_cycles(base_internal::CycleClock::Now()) {}
+
+ const Mutex::MuHow how; // How this thread needs to wait.
+ const Condition *cond; // The condition that this thread is waiting for.
+ // In Mutex, this field is set to zero if a timeout
+ // expires.
+ KernelTimeout timeout; // timeout expiry---absolute time
+ // In Mutex, this field is set to zero if a timeout
+ // expires.
+ Mutex *const cvmu; // used for transfer from cond var to mutex
+ PerThreadSynch *const thread; // thread that is waiting
+
+ // If not null, thread should be enqueued on the CondVar whose state
+ // word is cv_word instead of queueing normally on the Mutex.
+ std::atomic<intptr_t> *cv_word;
+
+ int64_t contention_start_cycles; // Time (in cycles) when this thread started
+ // to contend for the mutex.
+};
+
+struct SynchLocksHeld {
+ int n; // number of valid entries in locks[]
+ bool overflow; // true iff we overflowed the array at some point
+ struct {
+ Mutex *mu; // lock acquired
+ int32_t count; // times acquired
+ GraphId id; // deadlock_graph id of acquired lock
+ } locks[40];
+ // If a thread overfills the array during deadlock detection, we
+ // continue, discarding information as needed. If no overflow has
+ // taken place, we can provide more error checking, such as
+ // detecting when a thread releases a lock it does not hold.
+};
+
+// A sentinel value in lists that is not 0.
+// A 0 value is used to mean "not on a list".
+static PerThreadSynch *const kPerThreadSynchNull =
+ reinterpret_cast<PerThreadSynch *>(1);
+
+static SynchLocksHeld *LocksHeldAlloc() {
+ SynchLocksHeld *ret = reinterpret_cast<SynchLocksHeld *>(
+ base_internal::LowLevelAlloc::Alloc(sizeof(SynchLocksHeld)));
+ ret->n = 0;
+ ret->overflow = false;
+ return ret;
+}
+
+// Return the PerThreadSynch-struct for this thread.
+static PerThreadSynch *Synch_GetPerThread() {
+ ThreadIdentity *identity = GetOrCreateCurrentThreadIdentity();
+ return &identity->per_thread_synch;
+}
+
+static PerThreadSynch *Synch_GetPerThreadAnnotated(Mutex *mu) {
+ if (mu) {
+ ABSL_TSAN_MUTEX_PRE_DIVERT(mu, 0);
+ }
+ PerThreadSynch *w = Synch_GetPerThread();
+ if (mu) {
+ ABSL_TSAN_MUTEX_POST_DIVERT(mu, 0);
+ }
+ return w;
+}
+
+static SynchLocksHeld *Synch_GetAllLocks() {
+ PerThreadSynch *s = Synch_GetPerThread();
+ if (s->all_locks == nullptr) {
+ s->all_locks = LocksHeldAlloc(); // Freed by ReclaimThreadIdentity.
+ }
+ return s->all_locks;
+}
+
+// Post on "w"'s associated PerThreadSem.
+inline void Mutex::IncrementSynchSem(Mutex *mu, PerThreadSynch *w) {
+ if (mu) {
+ ABSL_TSAN_MUTEX_PRE_DIVERT(mu, 0);
+ }
+ PerThreadSem::Post(w->thread_identity());
+ if (mu) {
+ ABSL_TSAN_MUTEX_POST_DIVERT(mu, 0);
+ }
+}
+
+// Wait on "w"'s associated PerThreadSem; returns false if timeout expired.
+bool Mutex::DecrementSynchSem(Mutex *mu, PerThreadSynch *w, KernelTimeout t) {
+ if (mu) {
+ ABSL_TSAN_MUTEX_PRE_DIVERT(mu, 0);
+ }
+ assert(w == Synch_GetPerThread());
+ static_cast<void>(w);
+ bool res = PerThreadSem::Wait(t);
+ if (mu) {
+ ABSL_TSAN_MUTEX_POST_DIVERT(mu, 0);
+ }
+ return res;
+}
+
+// We're in a fatal signal handler that hopes to use Mutex and to get
+// lucky by not deadlocking. We try to improve its chances of success
+// by effectively disabling some of the consistency checks. This will
+// prevent certain ABSL_RAW_CHECK() statements from being triggered when
+// re-rentry is detected. The ABSL_RAW_CHECK() statements are those in the
+// Mutex code checking that the "waitp" field has not been reused.
+void Mutex::InternalAttemptToUseMutexInFatalSignalHandler() {
+ // Fix the per-thread state only if it exists.
+ ThreadIdentity *identity = CurrentThreadIdentityIfPresent();
+ if (identity != nullptr) {
+ identity->per_thread_synch.suppress_fatal_errors = true;
+ }
+ // Don't do deadlock detection when we are already failing.
+ synch_deadlock_detection.store(OnDeadlockCycle::kIgnore,
+ std::memory_order_release);
+}
+
+// --------------------------time support
+
+// Return the current time plus the timeout. Use the same clock as
+// PerThreadSem::Wait() for consistency. Unfortunately, we don't have
+// such a choice when a deadline is given directly.
+static absl::Time DeadlineFromTimeout(absl::Duration timeout) {
+#ifndef _WIN32
+ struct timeval tv;
+ gettimeofday(&tv, nullptr);
+ return absl::TimeFromTimeval(tv) + timeout;
+#else
+ return absl::Now() + timeout;
+#endif
+}
+
+// --------------------------Mutexes
+
+// In the layout below, the msb of the bottom byte is currently unused. Also,
+// the following constraints were considered in choosing the layout:
+// o Both the debug allocator's "uninitialized" and "freed" patterns (0xab and
+// 0xcd) are illegal: reader and writer lock both held.
+// o kMuWriter and kMuEvent should exceed kMuDesig and kMuWait, to enable the
+// bit-twiddling trick in Mutex::Unlock().
+// o kMuWriter / kMuReader == kMuWrWait / kMuWait,
+// to enable the bit-twiddling trick in CheckForMutexCorruption().
+static const intptr_t kMuReader = 0x0001L; // a reader holds the lock
+static const intptr_t kMuDesig = 0x0002L; // there's a designated waker
+static const intptr_t kMuWait = 0x0004L; // threads are waiting
+static const intptr_t kMuWriter = 0x0008L; // a writer holds the lock
+static const intptr_t kMuEvent = 0x0010L; // record this mutex's events
+// INVARIANT1: there's a thread that was blocked on the mutex, is
+// no longer, yet has not yet acquired the mutex. If there's a
+// designated waker, all threads can avoid taking the slow path in
+// unlock because the designated waker will subsequently acquire
+// the lock and wake someone. To maintain INVARIANT1 the bit is
+// set when a thread is unblocked(INV1a), and threads that were
+// unblocked reset the bit when they either acquire or re-block
+// (INV1b).
+static const intptr_t kMuWrWait = 0x0020L; // runnable writer is waiting
+ // for a reader
+static const intptr_t kMuSpin = 0x0040L; // spinlock protects wait list
+static const intptr_t kMuLow = 0x00ffL; // mask all mutex bits
+static const intptr_t kMuHigh = ~kMuLow; // mask pointer/reader count
+
+// Hack to make constant values available to gdb pretty printer
+enum {
+ kGdbMuSpin = kMuSpin,
+ kGdbMuEvent = kMuEvent,
+ kGdbMuWait = kMuWait,
+ kGdbMuWriter = kMuWriter,
+ kGdbMuDesig = kMuDesig,
+ kGdbMuWrWait = kMuWrWait,
+ kGdbMuReader = kMuReader,
+ kGdbMuLow = kMuLow,
+};
+
+// kMuWrWait implies kMuWait.
+// kMuReader and kMuWriter are mutually exclusive.
+// If kMuReader is zero, there are no readers.
+// Otherwise, if kMuWait is zero, the high order bits contain a count of the
+// number of readers. Otherwise, the reader count is held in
+// PerThreadSynch::readers of the most recently queued waiter, again in the
+// bits above kMuLow.
+static const intptr_t kMuOne = 0x0100; // a count of one reader
+
+// flags passed to Enqueue and LockSlow{,WithTimeout,Loop}
+static const int kMuHasBlocked = 0x01; // already blocked (MUST == 1)
+static const int kMuIsCond = 0x02; // conditional waiter (CV or Condition)
+
+static_assert(PerThreadSynch::kAlignment > kMuLow,
+ "PerThreadSynch::kAlignment must be greater than kMuLow");
+
+// This struct contains various bitmasks to be used in
+// acquiring and releasing a mutex in a particular mode.
+struct MuHowS {
+ // if all the bits in fast_need_zero are zero, the lock can be acquired by
+ // adding fast_add and oring fast_or. The bit kMuDesig should be reset iff
+ // this is the designated waker.
+ intptr_t fast_need_zero;
+ intptr_t fast_or;
+ intptr_t fast_add;
+
+ intptr_t slow_need_zero; // fast_need_zero with events (e.g. logging)
+
+ intptr_t slow_inc_need_zero; // if all the bits in slow_inc_need_zero are
+ // zero a reader can acquire a read share by
+ // setting the reader bit and incrementing
+ // the reader count (in last waiter since
+ // we're now slow-path). kMuWrWait be may
+ // be ignored if we already waited once.
+};
+
+static const MuHowS kSharedS = {
+ // shared or read lock
+ kMuWriter | kMuWait | kMuEvent, // fast_need_zero
+ kMuReader, // fast_or
+ kMuOne, // fast_add
+ kMuWriter | kMuWait, // slow_need_zero
+ kMuSpin | kMuWriter | kMuWrWait, // slow_inc_need_zero
+};
+static const MuHowS kExclusiveS = {
+ // exclusive or write lock
+ kMuWriter | kMuReader | kMuEvent, // fast_need_zero
+ kMuWriter, // fast_or
+ 0, // fast_add
+ kMuWriter | kMuReader, // slow_need_zero
+ ~static_cast<intptr_t>(0), // slow_inc_need_zero
+};
+static const Mutex::MuHow kShared = &kSharedS; // shared lock
+static const Mutex::MuHow kExclusive = &kExclusiveS; // exclusive lock
+
+#ifdef NDEBUG
+static constexpr bool kDebugMode = false;
+#else
+static constexpr bool kDebugMode = true;
+#endif
+
+#ifdef ABSL_INTERNAL_HAVE_TSAN_INTERFACE
+static unsigned TsanFlags(Mutex::MuHow how) {
+ return how == kShared ? __tsan_mutex_read_lock : 0;
+}
+#endif
+
+static bool DebugOnlyIsExiting() {
+ return false;
+}
+
+Mutex::~Mutex() {
+ intptr_t v = mu_.load(std::memory_order_relaxed);
+ if ((v & kMuEvent) != 0 && !DebugOnlyIsExiting()) {
+ ForgetSynchEvent(&this->mu_, kMuEvent, kMuSpin);
+ }
+ if (kDebugMode) {
+ this->ForgetDeadlockInfo();
+ }
+ ABSL_TSAN_MUTEX_DESTROY(this, __tsan_mutex_not_static);
+}
+
+void Mutex::EnableDebugLog(const char *name) {
+ SynchEvent *e = EnsureSynchEvent(&this->mu_, name, kMuEvent, kMuSpin);
+ e->log = true;
+ UnrefSynchEvent(e);
+}
+
+void EnableMutexInvariantDebugging(bool enabled) {
+ synch_check_invariants.store(enabled, std::memory_order_release);
+}
+
+void Mutex::EnableInvariantDebugging(void (*invariant)(void *),
+ void *arg) {
+ if (synch_check_invariants.load(std::memory_order_acquire) &&
+ invariant != nullptr) {
+ SynchEvent *e = EnsureSynchEvent(&this->mu_, nullptr, kMuEvent, kMuSpin);
+ e->invariant = invariant;
+ e->arg = arg;
+ UnrefSynchEvent(e);
+ }
+}
+
+void SetMutexDeadlockDetectionMode(OnDeadlockCycle mode) {
+ synch_deadlock_detection.store(mode, std::memory_order_release);
+}
+
+// Return true iff threads x and y are waiting on the same condition for the
+// same type of lock. Requires that x and y be waiting on the same Mutex
+// queue.
+static bool MuSameCondition(PerThreadSynch *x, PerThreadSynch *y) {
+ return x->waitp->how == y->waitp->how &&
+ Condition::GuaranteedEqual(x->waitp->cond, y->waitp->cond);
+}
+
+// Given the contents of a mutex word containing a PerThreadSynch pointer,
+// return the pointer.
+static inline PerThreadSynch *GetPerThreadSynch(intptr_t v) {
+ return reinterpret_cast<PerThreadSynch *>(v & kMuHigh);
+}
+
+// The next several routines maintain the per-thread next and skip fields
+// used in the Mutex waiter queue.
+// The queue is a circular singly-linked list, of which the "head" is the
+// last element, and head->next if the first element.
+// The skip field has the invariant:
+// For thread x, x->skip is one of:
+// - invalid (iff x is not in a Mutex wait queue),
+// - null, or
+// - a pointer to a distinct thread waiting later in the same Mutex queue
+// such that all threads in [x, x->skip] have the same condition and
+// lock type (MuSameCondition() is true for all pairs in [x, x->skip]).
+// In addition, if x->skip is valid, (x->may_skip || x->skip == null)
+//
+// By the spec of MuSameCondition(), it is not necessary when removing the
+// first runnable thread y from the front a Mutex queue to adjust the skip
+// field of another thread x because if x->skip==y, x->skip must (have) become
+// invalid before y is removed. The function TryRemove can remove a specified
+// thread from an arbitrary position in the queue whether runnable or not, so
+// it fixes up skip fields that would otherwise be left dangling.
+// The statement
+// if (x->may_skip && MuSameCondition(x, x->next)) { x->skip = x->next; }
+// maintains the invariant provided x is not the last waiter in a Mutex queue
+// The statement
+// if (x->skip != null) { x->skip = x->skip->skip; }
+// maintains the invariant.
+
+// Returns the last thread y in a mutex waiter queue such that all threads in
+// [x, y] inclusive share the same condition. Sets skip fields of some threads
+// in that range to optimize future evaluation of Skip() on x values in
+// the range. Requires thread x is in a mutex waiter queue.
+// The locking is unusual. Skip() is called under these conditions:
+// - spinlock is held in call from Enqueue(), with maybe_unlocking == false
+// - Mutex is held in call from UnlockSlow() by last unlocker, with
+// maybe_unlocking == true
+// - both Mutex and spinlock are held in call from DequeueAllWakeable() (from
+// UnlockSlow()) and TryRemove()
+// These cases are mutually exclusive, so Skip() never runs concurrently
+// with itself on the same Mutex. The skip chain is used in these other places
+// that cannot occur concurrently:
+// - FixSkip() (from TryRemove()) - spinlock and Mutex are held)
+// - Dequeue() (with spinlock and Mutex held)
+// - UnlockSlow() (with spinlock and Mutex held)
+// A more complex case is Enqueue()
+// - Enqueue() (with spinlock held and maybe_unlocking == false)
+// This is the first case in which Skip is called, above.
+// - Enqueue() (without spinlock held; but queue is empty and being freshly
+// formed)
+// - Enqueue() (with spinlock held and maybe_unlocking == true)
+// The first case has mutual exclusion, and the second isolation through
+// working on an otherwise unreachable data structure.
+// In the last case, Enqueue() is required to change no skip/next pointers
+// except those in the added node and the former "head" node. This implies
+// that the new node is added after head, and so must be the new head or the
+// new front of the queue.
+static PerThreadSynch *Skip(PerThreadSynch *x) {
+ PerThreadSynch *x0 = nullptr;
+ PerThreadSynch *x1 = x;
+ PerThreadSynch *x2 = x->skip;
+ if (x2 != nullptr) {
+ // Each iteration attempts to advance sequence (x0,x1,x2) to next sequence
+ // such that x1 == x0->skip && x2 == x1->skip
+ while ((x0 = x1, x1 = x2, x2 = x2->skip) != nullptr) {
+ x0->skip = x2; // short-circuit skip from x0 to x2
+ }
+ x->skip = x1; // short-circuit skip from x to result
+ }
+ return x1;
+}
+
+// "ancestor" appears before "to_be_removed" in the same Mutex waiter queue.
+// The latter is going to be removed out of order, because of a timeout.
+// Check whether "ancestor" has a skip field pointing to "to_be_removed",
+// and fix it if it does.
+static void FixSkip(PerThreadSynch *ancestor, PerThreadSynch *to_be_removed) {
+ if (ancestor->skip == to_be_removed) { // ancestor->skip left dangling
+ if (to_be_removed->skip != nullptr) {
+ ancestor->skip = to_be_removed->skip; // can skip past to_be_removed
+ } else if (ancestor->next != to_be_removed) { // they are not adjacent
+ ancestor->skip = ancestor->next; // can skip one past ancestor
+ } else {
+ ancestor->skip = nullptr; // can't skip at all
+ }
+ }
+}
+
+static void CondVarEnqueue(SynchWaitParams *waitp);
+
+// Enqueue thread "waitp->thread" on a waiter queue.
+// Called with mutex spinlock held if head != nullptr
+// If head==nullptr and waitp->cv_word==nullptr, then Enqueue() is
+// idempotent; it alters no state associated with the existing (empty)
+// queue.
+//
+// If waitp->cv_word == nullptr, queue the thread at either the front or
+// the end (according to its priority) of the circular mutex waiter queue whose
+// head is "head", and return the new head. mu is the previous mutex state,
+// which contains the reader count (perhaps adjusted for the operation in
+// progress) if the list was empty and a read lock held, and the holder hint if
+// the list was empty and a write lock held. (flags & kMuIsCond) indicates
+// whether this thread was transferred from a CondVar or is waiting for a
+// non-trivial condition. In this case, Enqueue() never returns nullptr
+//
+// If waitp->cv_word != nullptr, CondVarEnqueue() is called, and "head" is
+// returned. This mechanism is used by CondVar to queue a thread on the
+// condition variable queue instead of the mutex queue in implementing Wait().
+// In this case, Enqueue() can return nullptr (if head==nullptr).
+static PerThreadSynch *Enqueue(PerThreadSynch *head,
+ SynchWaitParams *waitp, intptr_t mu, int flags) {
+ // If we have been given a cv_word, call CondVarEnqueue() and return
+ // the previous head of the Mutex waiter queue.
+ if (waitp->cv_word != nullptr) {
+ CondVarEnqueue(waitp);
+ return head;
+ }
+
+ PerThreadSynch *s = waitp->thread;
+ ABSL_RAW_CHECK(
+ s->waitp == nullptr || // normal case
+ s->waitp == waitp || // Fer()---transfer from condition variable
+ s->suppress_fatal_errors,
+ "detected illegal recursion into Mutex code");
+ s->waitp = waitp;
+ s->skip = nullptr; // maintain skip invariant (see above)
+ s->may_skip = true; // always true on entering queue
+ s->wake = false; // not being woken
+ s->cond_waiter = ((flags & kMuIsCond) != 0);
+ if (head == nullptr) { // s is the only waiter
+ s->next = s; // it's the only entry in the cycle
+ s->readers = mu; // reader count is from mu word
+ s->maybe_unlocking = false; // no one is searching an empty list
+ head = s; // s is new head
+ } else {
+ PerThreadSynch *enqueue_after = nullptr; // we'll put s after this element
+#ifdef ABSL_HAVE_PTHREAD_GETSCHEDPARAM
+ int64_t now_cycles = base_internal::CycleClock::Now();
+ if (s->next_priority_read_cycles < now_cycles) {
+ // Every so often, update our idea of the thread's priority.
+ // pthread_getschedparam() is 5% of the block/wakeup time;
+ // base_internal::CycleClock::Now() is 0.5%.
+ int policy;
+ struct sched_param param;
+ const int err = pthread_getschedparam(pthread_self(), &policy, ¶m);
+ if (err != 0) {
+ ABSL_RAW_LOG(ERROR, "pthread_getschedparam failed: %d", err);
+ } else {
+ s->priority = param.sched_priority;
+ s->next_priority_read_cycles =
+ now_cycles +
+ static_cast<int64_t>(base_internal::CycleClock::Frequency());
+ }
+ }
+ if (s->priority > head->priority) { // s's priority is above head's
+ // try to put s in priority-fifo order, or failing that at the front.
+ if (!head->maybe_unlocking) {
+ // No unlocker can be scanning the queue, so we can insert between
+ // skip-chains, and within a skip-chain if it has the same condition as
+ // s. We insert in priority-fifo order, examining the end of every
+ // skip-chain, plus every element with the same condition as s.
+ PerThreadSynch *advance_to = head; // next value of enqueue_after
+ PerThreadSynch *cur; // successor of enqueue_after
+ do {
+ enqueue_after = advance_to;
+ cur = enqueue_after->next; // this advance ensures progress
+ advance_to = Skip(cur); // normally, advance to end of skip chain
+ // (side-effect: optimizes skip chain)
+ if (advance_to != cur && s->priority > advance_to->priority &&
+ MuSameCondition(s, cur)) {
+ // but this skip chain is not a singleton, s has higher priority
+ // than its tail and has the same condition as the chain,
+ // so we can insert within the skip-chain
+ advance_to = cur; // advance by just one
+ }
+ } while (s->priority <= advance_to->priority);
+ // termination guaranteed because s->priority > head->priority
+ // and head is the end of a skip chain
+ } else if (waitp->how == kExclusive &&
+ Condition::GuaranteedEqual(waitp->cond, nullptr)) {
+ // An unlocker could be scanning the queue, but we know it will recheck
+ // the queue front for writers that have no condition, which is what s
+ // is, so an insert at front is safe.
+ enqueue_after = head; // add after head, at front
+ }
+ }
+#endif
+ if (enqueue_after != nullptr) {
+ s->next = enqueue_after->next;
+ enqueue_after->next = s;
+
+ // enqueue_after can be: head, Skip(...), or cur.
+ // The first two imply enqueue_after->skip == nullptr, and
+ // the last is used only if MuSameCondition(s, cur).
+ // We require this because clearing enqueue_after->skip
+ // is impossible; enqueue_after's predecessors might also
+ // incorrectly skip over s if we were to allow other
+ // insertion points.
+ ABSL_RAW_CHECK(
+ enqueue_after->skip == nullptr || MuSameCondition(enqueue_after, s),
+ "Mutex Enqueue failure");
+
+ if (enqueue_after != head && enqueue_after->may_skip &&
+ MuSameCondition(enqueue_after, enqueue_after->next)) {
+ // enqueue_after can skip to its new successor, s
+ enqueue_after->skip = enqueue_after->next;
+ }
+ if (MuSameCondition(s, s->next)) { // s->may_skip is known to be true
+ s->skip = s->next; // s may skip to its successor
+ }
+ } else { // enqueue not done any other way, so
+ // we're inserting s at the back
+ // s will become new head; copy data from head into it
+ s->next = head->next; // add s after head
+ head->next = s;
+ s->readers = head->readers; // reader count is from previous head
+ s->maybe_unlocking = head->maybe_unlocking; // same for unlock hint
+ if (head->may_skip && MuSameCondition(head, s)) {
+ // head now has successor; may skip
+ head->skip = s;
+ }
+ head = s; // s is new head
+ }
+ }
+ s->state.store(PerThreadSynch::kQueued, std::memory_order_relaxed);
+ return head;
+}
+
+// Dequeue the successor pw->next of thread pw from the Mutex waiter queue
+// whose last element is head. The new head element is returned, or null
+// if the list is made empty.
+// Dequeue is called with both spinlock and Mutex held.
+static PerThreadSynch *Dequeue(PerThreadSynch *head, PerThreadSynch *pw) {
+ PerThreadSynch *w = pw->next;
+ pw->next = w->next; // snip w out of list
+ if (head == w) { // we removed the head
+ head = (pw == w) ? nullptr : pw; // either emptied list, or pw is new head
+ } else if (pw != head && MuSameCondition(pw, pw->next)) {
+ // pw can skip to its new successor
+ if (pw->next->skip !=
+ nullptr) { // either skip to its successors skip target
+ pw->skip = pw->next->skip;
+ } else { // or to pw's successor
+ pw->skip = pw->next;
+ }
+ }
+ return head;
+}
+
+// Traverse the elements [ pw->next, h] of the circular list whose last element
+// is head.
+// Remove all elements with wake==true and place them in the
+// singly-linked list wake_list in the order found. Assumes that
+// there is only one such element if the element has how == kExclusive.
+// Return the new head.
+static PerThreadSynch *DequeueAllWakeable(PerThreadSynch *head,
+ PerThreadSynch *pw,
+ PerThreadSynch **wake_tail) {
+ PerThreadSynch *orig_h = head;
+ PerThreadSynch *w = pw->next;
+ bool skipped = false;
+ do {
+ if (w->wake) { // remove this element
+ ABSL_RAW_CHECK(pw->skip == nullptr, "bad skip in DequeueAllWakeable");
+ // we're removing pw's successor so either pw->skip is zero or we should
+ // already have removed pw since if pw->skip!=null, pw has the same
+ // condition as w.
+ head = Dequeue(head, pw);
+ w->next = *wake_tail; // keep list terminated
+ *wake_tail = w; // add w to wake_list;
+ wake_tail = &w->next; // next addition to end
+ if (w->waitp->how == kExclusive) { // wake at most 1 writer
+ break;
+ }
+ } else { // not waking this one; skip
+ pw = Skip(w); // skip as much as possible
+ skipped = true;
+ }
+ w = pw->next;
+ // We want to stop processing after we've considered the original head,
+ // orig_h. We can't test for w==orig_h in the loop because w may skip over
+ // it; we are guaranteed only that w's predecessor will not skip over
+ // orig_h. When we've considered orig_h, either we've processed it and
+ // removed it (so orig_h != head), or we considered it and skipped it (so
+ // skipped==true && pw == head because skipping from head always skips by
+ // just one, leaving pw pointing at head). So we want to
+ // continue the loop with the negation of that expression.
+ } while (orig_h == head && (pw != head || !skipped));
+ return head;
+}
+
+// Try to remove thread s from the list of waiters on this mutex.
+// Does nothing if s is not on the waiter list.
+void Mutex::TryRemove(PerThreadSynch *s) {
+ SchedulingGuard::ScopedDisable disable_rescheduling;
+ intptr_t v = mu_.load(std::memory_order_relaxed);
+ // acquire spinlock & lock
+ if ((v & (kMuWait | kMuSpin | kMuWriter | kMuReader)) == kMuWait &&
+ mu_.compare_exchange_strong(v, v | kMuSpin | kMuWriter,
+ std::memory_order_acquire,
+ std::memory_order_relaxed)) {
+ PerThreadSynch *h = GetPerThreadSynch(v);
+ if (h != nullptr) {
+ PerThreadSynch *pw = h; // pw is w's predecessor
+ PerThreadSynch *w;
+ if ((w = pw->next) != s) { // search for thread,
+ do { // processing at least one element
+ if (!MuSameCondition(s, w)) { // seeking different condition
+ pw = Skip(w); // so skip all that won't match
+ // we don't have to worry about dangling skip fields
+ // in the threads we skipped; none can point to s
+ // because their condition differs from s
+ } else { // seeking same condition
+ FixSkip(w, s); // fix up any skip pointer from w to s
+ pw = w;
+ }
+ // don't search further if we found the thread, or we're about to
+ // process the first thread again.
+ } while ((w = pw->next) != s && pw != h);
+ }
+ if (w == s) { // found thread; remove it
+ // pw->skip may be non-zero here; the loop above ensured that
+ // no ancestor of s can skip to s, so removal is safe anyway.
+ h = Dequeue(h, pw);
+ s->next = nullptr;
+ s->state.store(PerThreadSynch::kAvailable, std::memory_order_release);
+ }
+ }
+ intptr_t nv;
+ do { // release spinlock and lock
+ v = mu_.load(std::memory_order_relaxed);
+ nv = v & (kMuDesig | kMuEvent);
+ if (h != nullptr) {
+ nv |= kMuWait | reinterpret_cast<intptr_t>(h);
+ h->readers = 0; // we hold writer lock
+ h->maybe_unlocking = false; // finished unlocking
+ }
+ } while (!mu_.compare_exchange_weak(v, nv,
+ std::memory_order_release,
+ std::memory_order_relaxed));
+ }
+}
+
+// Wait until thread "s", which must be the current thread, is removed from the
+// this mutex's waiter queue. If "s->waitp->timeout" has a timeout, wake up
+// if the wait extends past the absolute time specified, even if "s" is still
+// on the mutex queue. In this case, remove "s" from the queue and return
+// true, otherwise return false.
+ABSL_XRAY_LOG_ARGS(1) void Mutex::Block(PerThreadSynch *s) {
+ while (s->state.load(std::memory_order_acquire) == PerThreadSynch::kQueued) {
+ if (!DecrementSynchSem(this, s, s->waitp->timeout)) {
+ // After a timeout, we go into a spin loop until we remove ourselves
+ // from the queue, or someone else removes us. We can't be sure to be
+ // able to remove ourselves in a single lock acquisition because this
+ // mutex may be held, and the holder has the right to read the centre
+ // of the waiter queue without holding the spinlock.
+ this->TryRemove(s);
+ int c = 0;
+ while (s->next != nullptr) {
+ c = synchronization_internal::MutexDelay(c, GENTLE);
+ this->TryRemove(s);
+ }
+ if (kDebugMode) {
+ // This ensures that we test the case that TryRemove() is called when s
+ // is not on the queue.
+ this->TryRemove(s);
+ }
+ s->waitp->timeout = KernelTimeout::Never(); // timeout is satisfied
+ s->waitp->cond = nullptr; // condition no longer relevant for wakeups
+ }
+ }
+ ABSL_RAW_CHECK(s->waitp != nullptr || s->suppress_fatal_errors,
+ "detected illegal recursion in Mutex code");
+ s->waitp = nullptr;
+}
+
+// Wake thread w, and return the next thread in the list.
+PerThreadSynch *Mutex::Wakeup(PerThreadSynch *w) {
+ PerThreadSynch *next = w->next;
+ w->next = nullptr;
+ w->state.store(PerThreadSynch::kAvailable, std::memory_order_release);
+ IncrementSynchSem(this, w);
+
+ return next;
+}
+
+static GraphId GetGraphIdLocked(Mutex *mu)
+ ABSL_EXCLUSIVE_LOCKS_REQUIRED(deadlock_graph_mu) {
+ if (!deadlock_graph) { // (re)create the deadlock graph.
+ deadlock_graph =
+ new (base_internal::LowLevelAlloc::Alloc(sizeof(*deadlock_graph)))
+ GraphCycles;
+ }
+ return deadlock_graph->GetId(mu);
+}
+
+static GraphId GetGraphId(Mutex *mu) ABSL_LOCKS_EXCLUDED(deadlock_graph_mu) {
+ deadlock_graph_mu.Lock();
+ GraphId id = GetGraphIdLocked(mu);
+ deadlock_graph_mu.Unlock();
+ return id;
+}
+
+// Record a lock acquisition. This is used in debug mode for deadlock
+// detection. The held_locks pointer points to the relevant data
+// structure for each case.
+static void LockEnter(Mutex* mu, GraphId id, SynchLocksHeld *held_locks) {
+ int n = held_locks->n;
+ int i = 0;
+ while (i != n && held_locks->locks[i].id != id) {
+ i++;
+ }
+ if (i == n) {
+ if (n == ABSL_ARRAYSIZE(held_locks->locks)) {
+ held_locks->overflow = true; // lost some data
+ } else { // we have room for lock
+ held_locks->locks[i].mu = mu;
+ held_locks->locks[i].count = 1;
+ held_locks->locks[i].id = id;
+ held_locks->n = n + 1;
+ }
+ } else {
+ held_locks->locks[i].count++;
+ }
+}
+
+// Record a lock release. Each call to LockEnter(mu, id, x) should be
+// eventually followed by a call to LockLeave(mu, id, x) by the same thread.
+// It does not process the event if is not needed when deadlock detection is
+// disabled.
+static void LockLeave(Mutex* mu, GraphId id, SynchLocksHeld *held_locks) {
+ int n = held_locks->n;
+ int i = 0;
+ while (i != n && held_locks->locks[i].id != id) {
+ i++;
+ }
+ if (i == n) {
+ if (!held_locks->overflow) {
+ // The deadlock id may have been reassigned after ForgetDeadlockInfo,
+ // but in that case mu should still be present.
+ i = 0;
+ while (i != n && held_locks->locks[i].mu != mu) {
+ i++;
+ }
+ if (i == n) { // mu missing means releasing unheld lock
+ SynchEvent *mu_events = GetSynchEvent(mu);
+ ABSL_RAW_LOG(FATAL,
+ "thread releasing lock it does not hold: %p %s; "
+ ,
+ static_cast<void *>(mu),
+ mu_events == nullptr ? "" : mu_events->name);
+ }
+ }
+ } else if (held_locks->locks[i].count == 1) {
+ held_locks->n = n - 1;
+ held_locks->locks[i] = held_locks->locks[n - 1];
+ held_locks->locks[n - 1].id = InvalidGraphId();
+ held_locks->locks[n - 1].mu =
+ nullptr; // clear mu to please the leak detector.
+ } else {
+ assert(held_locks->locks[i].count > 0);
+ held_locks->locks[i].count--;
+ }
+}
+
+// Call LockEnter() if in debug mode and deadlock detection is enabled.
+static inline void DebugOnlyLockEnter(Mutex *mu) {
+ if (kDebugMode) {
+ if (synch_deadlock_detection.load(std::memory_order_acquire) !=
+ OnDeadlockCycle::kIgnore) {
+ LockEnter(mu, GetGraphId(mu), Synch_GetAllLocks());
+ }
+ }
+}
+
+// Call LockEnter() if in debug mode and deadlock detection is enabled.
+static inline void DebugOnlyLockEnter(Mutex *mu, GraphId id) {
+ if (kDebugMode) {
+ if (synch_deadlock_detection.load(std::memory_order_acquire) !=
+ OnDeadlockCycle::kIgnore) {
+ LockEnter(mu, id, Synch_GetAllLocks());
+ }
+ }
+}
+
+// Call LockLeave() if in debug mode and deadlock detection is enabled.
+static inline void DebugOnlyLockLeave(Mutex *mu) {
+ if (kDebugMode) {
+ if (synch_deadlock_detection.load(std::memory_order_acquire) !=
+ OnDeadlockCycle::kIgnore) {
+ LockLeave(mu, GetGraphId(mu), Synch_GetAllLocks());
+ }
+ }
+}
+
+static char *StackString(void **pcs, int n, char *buf, int maxlen,
+ bool symbolize) {
+ static const int kSymLen = 200;
+ char sym[kSymLen];
+ int len = 0;
+ for (int i = 0; i != n; i++) {
+ if (symbolize) {
+ if (!symbolizer(pcs[i], sym, kSymLen)) {
+ sym[0] = '\0';
+ }
+ snprintf(buf + len, maxlen - len, "%s\t@ %p %s\n",
+ (i == 0 ? "\n" : ""),
+ pcs[i], sym);
+ } else {
+ snprintf(buf + len, maxlen - len, " %p", pcs[i]);
+ }
+ len += strlen(&buf[len]);
+ }
+ return buf;
+}
+
+static char *CurrentStackString(char *buf, int maxlen, bool symbolize) {
+ void *pcs[40];
+ return StackString(pcs, absl::GetStackTrace(pcs, ABSL_ARRAYSIZE(pcs), 2), buf,
+ maxlen, symbolize);
+}
+
+namespace {
+enum { kMaxDeadlockPathLen = 10 }; // maximum length of a deadlock cycle;
+ // a path this long would be remarkable
+// Buffers required to report a deadlock.
+// We do not allocate them on stack to avoid large stack frame.
+struct DeadlockReportBuffers {
+ char buf[6100];
+ GraphId path[kMaxDeadlockPathLen];
+};
+
+struct ScopedDeadlockReportBuffers {
+ ScopedDeadlockReportBuffers() {
+ b = reinterpret_cast<DeadlockReportBuffers *>(
+ base_internal::LowLevelAlloc::Alloc(sizeof(*b)));
+ }
+ ~ScopedDeadlockReportBuffers() { base_internal::LowLevelAlloc::Free(b); }
+ DeadlockReportBuffers *b;
+};
+
+// Helper to pass to GraphCycles::UpdateStackTrace.
+int GetStack(void** stack, int max_depth) {
+ return absl::GetStackTrace(stack, max_depth, 3);
+}
+} // anonymous namespace
+
+// Called in debug mode when a thread is about to acquire a lock in a way that
+// may block.
+static GraphId DeadlockCheck(Mutex *mu) {
+ if (synch_deadlock_detection.load(std::memory_order_acquire) ==
+ OnDeadlockCycle::kIgnore) {
+ return InvalidGraphId();
+ }
+
+ SynchLocksHeld *all_locks = Synch_GetAllLocks();
+
+ absl::base_internal::SpinLockHolder lock(&deadlock_graph_mu);
+ const GraphId mu_id = GetGraphIdLocked(mu);
+
+ if (all_locks->n == 0) {
+ // There are no other locks held. Return now so that we don't need to
+ // call GetSynchEvent(). This way we do not record the stack trace
+ // for this Mutex. It's ok, since if this Mutex is involved in a deadlock,
+ // it can't always be the first lock acquired by a thread.
+ return mu_id;
+ }
+
+ // We prefer to keep stack traces that show a thread holding and acquiring
+ // as many locks as possible. This increases the chances that a given edge
+ // in the acquires-before graph will be represented in the stack traces
+ // recorded for the locks.
+ deadlock_graph->UpdateStackTrace(mu_id, all_locks->n + 1, GetStack);
+
+ // For each other mutex already held by this thread:
+ for (int i = 0; i != all_locks->n; i++) {
+ const GraphId other_node_id = all_locks->locks[i].id;
+ const Mutex *other =
+ static_cast<const Mutex *>(deadlock_graph->Ptr(other_node_id));
+ if (other == nullptr) {
+ // Ignore stale lock
+ continue;
+ }
+
+ // Add the acquired-before edge to the graph.
+ if (!deadlock_graph->InsertEdge(other_node_id, mu_id)) {
+ ScopedDeadlockReportBuffers scoped_buffers;
+ DeadlockReportBuffers *b = scoped_buffers.b;
+ static int number_of_reported_deadlocks = 0;
+ number_of_reported_deadlocks++;
+ // Symbolize only 2 first deadlock report to avoid huge slowdowns.
+ bool symbolize = number_of_reported_deadlocks <= 2;
+ ABSL_RAW_LOG(ERROR, "Potential Mutex deadlock: %s",
+ CurrentStackString(b->buf, sizeof (b->buf), symbolize));
+ int len = 0;
+ for (int j = 0; j != all_locks->n; j++) {
+ void* pr = deadlock_graph->Ptr(all_locks->locks[j].id);
+ if (pr != nullptr) {
+ snprintf(b->buf + len, sizeof (b->buf) - len, " %p", pr);
+ len += static_cast<int>(strlen(&b->buf[len]));
+ }
+ }
+ ABSL_RAW_LOG(ERROR, "Acquiring %p Mutexes held: %s",
+ static_cast<void *>(mu), b->buf);
+ ABSL_RAW_LOG(ERROR, "Cycle: ");
+ int path_len = deadlock_graph->FindPath(
+ mu_id, other_node_id, ABSL_ARRAYSIZE(b->path), b->path);
+ for (int j = 0; j != path_len; j++) {
+ GraphId id = b->path[j];
+ Mutex *path_mu = static_cast<Mutex *>(deadlock_graph->Ptr(id));
+ if (path_mu == nullptr) continue;
+ void** stack;
+ int depth = deadlock_graph->GetStackTrace(id, &stack);
+ snprintf(b->buf, sizeof(b->buf),
+ "mutex@%p stack: ", static_cast<void *>(path_mu));
+ StackString(stack, depth, b->buf + strlen(b->buf),
+ static_cast<int>(sizeof(b->buf) - strlen(b->buf)),
+ symbolize);
+ ABSL_RAW_LOG(ERROR, "%s", b->buf);
+ }
+ if (synch_deadlock_detection.load(std::memory_order_acquire) ==
+ OnDeadlockCycle::kAbort) {
+ deadlock_graph_mu.Unlock(); // avoid deadlock in fatal sighandler
+ ABSL_RAW_LOG(FATAL, "dying due to potential deadlock");
+ return mu_id;
+ }
+ break; // report at most one potential deadlock per acquisition
+ }
+ }
+
+ return mu_id;
+}
+
+// Invoke DeadlockCheck() iff we're in debug mode and
+// deadlock checking has been enabled.
+static inline GraphId DebugOnlyDeadlockCheck(Mutex *mu) {
+ if (kDebugMode && synch_deadlock_detection.load(std::memory_order_acquire) !=
+ OnDeadlockCycle::kIgnore) {
+ return DeadlockCheck(mu);
+ } else {
+ return InvalidGraphId();
+ }
+}
+
+void Mutex::ForgetDeadlockInfo() {
+ if (kDebugMode && synch_deadlock_detection.load(std::memory_order_acquire) !=
+ OnDeadlockCycle::kIgnore) {
+ deadlock_graph_mu.Lock();
+ if (deadlock_graph != nullptr) {
+ deadlock_graph->RemoveNode(this);
+ }
+ deadlock_graph_mu.Unlock();
+ }
+}
+
+void Mutex::AssertNotHeld() const {
+ // We have the data to allow this check only if in debug mode and deadlock
+ // detection is enabled.
+ if (kDebugMode &&
+ (mu_.load(std::memory_order_relaxed) & (kMuWriter | kMuReader)) != 0 &&
+ synch_deadlock_detection.load(std::memory_order_acquire) !=
+ OnDeadlockCycle::kIgnore) {
+ GraphId id = GetGraphId(const_cast<Mutex *>(this));
+ SynchLocksHeld *locks = Synch_GetAllLocks();
+ for (int i = 0; i != locks->n; i++) {
+ if (locks->locks[i].id == id) {
+ SynchEvent *mu_events = GetSynchEvent(this);
+ ABSL_RAW_LOG(FATAL, "thread should not hold mutex %p %s",
+ static_cast<const void *>(this),
+ (mu_events == nullptr ? "" : mu_events->name));
+ }
+ }
+ }
+}
+
+// Attempt to acquire *mu, and return whether successful. The implementation
+// may spin for a short while if the lock cannot be acquired immediately.
+static bool TryAcquireWithSpinning(std::atomic<intptr_t>* mu) {
+ int c = GetMutexGlobals().spinloop_iterations;
+ do { // do/while somewhat faster on AMD
+ intptr_t v = mu->load(std::memory_order_relaxed);
+ if ((v & (kMuReader|kMuEvent)) != 0) {
+ return false; // a reader or tracing -> give up
+ } else if (((v & kMuWriter) == 0) && // no holder -> try to acquire
+ mu->compare_exchange_strong(v, kMuWriter | v,
+ std::memory_order_acquire,
+ std::memory_order_relaxed)) {
+ return true;
+ }
+ } while (--c > 0);
+ return false;
+}
+
+ABSL_XRAY_LOG_ARGS(1) void Mutex::Lock() {
+ ABSL_TSAN_MUTEX_PRE_LOCK(this, 0);
+ GraphId id = DebugOnlyDeadlockCheck(this);
+ intptr_t v = mu_.load(std::memory_order_relaxed);
+ // try fast acquire, then spin loop
+ if ((v & (kMuWriter | kMuReader | kMuEvent)) != 0 ||
+ !mu_.compare_exchange_strong(v, kMuWriter | v,
+ std::memory_order_acquire,
+ std::memory_order_relaxed)) {
+ // try spin acquire, then slow loop
+ if (!TryAcquireWithSpinning(&this->mu_)) {
+ this->LockSlow(kExclusive, nullptr, 0);
+ }
+ }
+ DebugOnlyLockEnter(this, id);
+ ABSL_TSAN_MUTEX_POST_LOCK(this, 0, 0);
+}
+
+ABSL_XRAY_LOG_ARGS(1) void Mutex::ReaderLock() {
+ ABSL_TSAN_MUTEX_PRE_LOCK(this, __tsan_mutex_read_lock);
+ GraphId id = DebugOnlyDeadlockCheck(this);
+ intptr_t v = mu_.load(std::memory_order_relaxed);
+ // try fast acquire, then slow loop
+ if ((v & (kMuWriter | kMuWait | kMuEvent)) != 0 ||
+ !mu_.compare_exchange_strong(v, (kMuReader | v) + kMuOne,
+ std::memory_order_acquire,
+ std::memory_order_relaxed)) {
+ this->LockSlow(kShared, nullptr, 0);
+ }
+ DebugOnlyLockEnter(this, id);
+ ABSL_TSAN_MUTEX_POST_LOCK(this, __tsan_mutex_read_lock, 0);
+}
+
+void Mutex::LockWhen(const Condition &cond) {
+ ABSL_TSAN_MUTEX_PRE_LOCK(this, 0);
+ GraphId id = DebugOnlyDeadlockCheck(this);
+ this->LockSlow(kExclusive, &cond, 0);
+ DebugOnlyLockEnter(this, id);
+ ABSL_TSAN_MUTEX_POST_LOCK(this, 0, 0);
+}
+
+bool Mutex::LockWhenWithTimeout(const Condition &cond, absl::Duration timeout) {
+ return LockWhenWithDeadline(cond, DeadlineFromTimeout(timeout));
+}
+
+bool Mutex::LockWhenWithDeadline(const Condition &cond, absl::Time deadline) {
+ ABSL_TSAN_MUTEX_PRE_LOCK(this, 0);
+ GraphId id = DebugOnlyDeadlockCheck(this);
+ bool res = LockSlowWithDeadline(kExclusive, &cond,
+ KernelTimeout(deadline), 0);
+ DebugOnlyLockEnter(this, id);
+ ABSL_TSAN_MUTEX_POST_LOCK(this, 0, 0);
+ return res;
+}
+
+void Mutex::ReaderLockWhen(const Condition &cond) {
+ ABSL_TSAN_MUTEX_PRE_LOCK(this, __tsan_mutex_read_lock);
+ GraphId id = DebugOnlyDeadlockCheck(this);
+ this->LockSlow(kShared, &cond, 0);
+ DebugOnlyLockEnter(this, id);
+ ABSL_TSAN_MUTEX_POST_LOCK(this, __tsan_mutex_read_lock, 0);
+}
+
+bool Mutex::ReaderLockWhenWithTimeout(const Condition &cond,
+ absl::Duration timeout) {
+ return ReaderLockWhenWithDeadline(cond, DeadlineFromTimeout(timeout));
+}
+
+bool Mutex::ReaderLockWhenWithDeadline(const Condition &cond,
+ absl::Time deadline) {
+ ABSL_TSAN_MUTEX_PRE_LOCK(this, __tsan_mutex_read_lock);
+ GraphId id = DebugOnlyDeadlockCheck(this);
+ bool res = LockSlowWithDeadline(kShared, &cond, KernelTimeout(deadline), 0);
+ DebugOnlyLockEnter(this, id);
+ ABSL_TSAN_MUTEX_POST_LOCK(this, __tsan_mutex_read_lock, 0);
+ return res;
+}
+
+void Mutex::Await(const Condition &cond) {
+ if (cond.Eval()) { // condition already true; nothing to do
+ if (kDebugMode) {
+ this->AssertReaderHeld();
+ }
+ } else { // normal case
+ ABSL_RAW_CHECK(this->AwaitCommon(cond, KernelTimeout::Never()),
+ "condition untrue on return from Await");
+ }
+}
+
+bool Mutex::AwaitWithTimeout(const Condition &cond, absl::Duration timeout) {
+ return AwaitWithDeadline(cond, DeadlineFromTimeout(timeout));
+}
+
+bool Mutex::AwaitWithDeadline(const Condition &cond, absl::Time deadline) {
+ if (cond.Eval()) { // condition already true; nothing to do
+ if (kDebugMode) {
+ this->AssertReaderHeld();
+ }
+ return true;
+ }
+
+ KernelTimeout t{deadline};
+ bool res = this->AwaitCommon(cond, t);
+ ABSL_RAW_CHECK(res || t.has_timeout(),
+ "condition untrue on return from Await");
+ return res;
+}
+
+bool Mutex::AwaitCommon(const Condition &cond, KernelTimeout t) {
+ this->AssertReaderHeld();
+ MuHow how =
+ (mu_.load(std::memory_order_relaxed) & kMuWriter) ? kExclusive : kShared;
+ ABSL_TSAN_MUTEX_PRE_UNLOCK(this, TsanFlags(how));
+ SynchWaitParams waitp(
+ how, &cond, t, nullptr /*no cvmu*/, Synch_GetPerThreadAnnotated(this),
+ nullptr /*no cv_word*/);
+ int flags = kMuHasBlocked;
+ if (!Condition::GuaranteedEqual(&cond, nullptr)) {
+ flags |= kMuIsCond;
+ }
+ this->UnlockSlow(&waitp);
+ this->Block(waitp.thread);
+ ABSL_TSAN_MUTEX_POST_UNLOCK(this, TsanFlags(how));
+ ABSL_TSAN_MUTEX_PRE_LOCK(this, TsanFlags(how));
+ this->LockSlowLoop(&waitp, flags);
+ bool res = waitp.cond != nullptr || // => cond known true from LockSlowLoop
+ EvalConditionAnnotated(&cond, this, true, false, how == kShared);
+ ABSL_TSAN_MUTEX_POST_LOCK(this, TsanFlags(how), 0);
+ return res;
+}
+
+ABSL_XRAY_LOG_ARGS(1) bool Mutex::TryLock() {
+ ABSL_TSAN_MUTEX_PRE_LOCK(this, __tsan_mutex_try_lock);
+ intptr_t v = mu_.load(std::memory_order_relaxed);
+ if ((v & (kMuWriter | kMuReader | kMuEvent)) == 0 && // try fast acquire
+ mu_.compare_exchange_strong(v, kMuWriter | v,
+ std::memory_order_acquire,
+ std::memory_order_relaxed)) {
+ DebugOnlyLockEnter(this);
+ ABSL_TSAN_MUTEX_POST_LOCK(this, __tsan_mutex_try_lock, 0);
+ return true;
+ }
+ if ((v & kMuEvent) != 0) { // we're recording events
+ if ((v & kExclusive->slow_need_zero) == 0 && // try fast acquire
+ mu_.compare_exchange_strong(
+ v, (kExclusive->fast_or | v) + kExclusive->fast_add,
+ std::memory_order_acquire, std::memory_order_relaxed)) {
+ DebugOnlyLockEnter(this);
+ PostSynchEvent(this, SYNCH_EV_TRYLOCK_SUCCESS);
+ ABSL_TSAN_MUTEX_POST_LOCK(this, __tsan_mutex_try_lock, 0);
+ return true;
+ } else {
+ PostSynchEvent(this, SYNCH_EV_TRYLOCK_FAILED);
+ }
+ }
+ ABSL_TSAN_MUTEX_POST_LOCK(
+ this, __tsan_mutex_try_lock | __tsan_mutex_try_lock_failed, 0);
+ return false;
+}
+
+ABSL_XRAY_LOG_ARGS(1) bool Mutex::ReaderTryLock() {
+ ABSL_TSAN_MUTEX_PRE_LOCK(this,
+ __tsan_mutex_read_lock | __tsan_mutex_try_lock);
+ intptr_t v = mu_.load(std::memory_order_relaxed);
+ // The while-loops (here and below) iterate only if the mutex word keeps
+ // changing (typically because the reader count changes) under the CAS. We
+ // limit the number of attempts to avoid having to think about livelock.
+ int loop_limit = 5;
+ while ((v & (kMuWriter|kMuWait|kMuEvent)) == 0 && loop_limit != 0) {
+ if (mu_.compare_exchange_strong(v, (kMuReader | v) + kMuOne,
+ std::memory_order_acquire,
+ std::memory_order_relaxed)) {
+ DebugOnlyLockEnter(this);
+ ABSL_TSAN_MUTEX_POST_LOCK(
+ this, __tsan_mutex_read_lock | __tsan_mutex_try_lock, 0);
+ return true;
+ }
+ loop_limit--;
+ v = mu_.load(std::memory_order_relaxed);
+ }
+ if ((v & kMuEvent) != 0) { // we're recording events
+ loop_limit = 5;
+ while ((v & kShared->slow_need_zero) == 0 && loop_limit != 0) {
+ if (mu_.compare_exchange_strong(v, (kMuReader | v) + kMuOne,
+ std::memory_order_acquire,
+ std::memory_order_relaxed)) {
+ DebugOnlyLockEnter(this);
+ PostSynchEvent(this, SYNCH_EV_READERTRYLOCK_SUCCESS);
+ ABSL_TSAN_MUTEX_POST_LOCK(
+ this, __tsan_mutex_read_lock | __tsan_mutex_try_lock, 0);
+ return true;
+ }
+ loop_limit--;
+ v = mu_.load(std::memory_order_relaxed);
+ }
+ if ((v & kMuEvent) != 0) {
+ PostSynchEvent(this, SYNCH_EV_READERTRYLOCK_FAILED);
+ }
+ }
+ ABSL_TSAN_MUTEX_POST_LOCK(this,
+ __tsan_mutex_read_lock | __tsan_mutex_try_lock |
+ __tsan_mutex_try_lock_failed,
+ 0);
+ return false;
+}
+
+ABSL_XRAY_LOG_ARGS(1) void Mutex::Unlock() {
+ ABSL_TSAN_MUTEX_PRE_UNLOCK(this, 0);
+ DebugOnlyLockLeave(this);
+ intptr_t v = mu_.load(std::memory_order_relaxed);
+
+ if (kDebugMode && ((v & (kMuWriter | kMuReader)) != kMuWriter)) {
+ ABSL_RAW_LOG(FATAL, "Mutex unlocked when destroyed or not locked: v=0x%x",
+ static_cast<unsigned>(v));
+ }
+
+ // should_try_cas is whether we'll try a compare-and-swap immediately.
+ // NOTE: optimized out when kDebugMode is false.
+ bool should_try_cas = ((v & (kMuEvent | kMuWriter)) == kMuWriter &&
+ (v & (kMuWait | kMuDesig)) != kMuWait);
+ // But, we can use an alternate computation of it, that compilers
+ // currently don't find on their own. When that changes, this function
+ // can be simplified.
+ intptr_t x = (v ^ (kMuWriter | kMuWait)) & (kMuWriter | kMuEvent);
+ intptr_t y = (v ^ (kMuWriter | kMuWait)) & (kMuWait | kMuDesig);
+ // Claim: "x == 0 && y > 0" is equal to should_try_cas.
+ // Also, because kMuWriter and kMuEvent exceed kMuDesig and kMuWait,
+ // all possible non-zero values for x exceed all possible values for y.
+ // Therefore, (x == 0 && y > 0) == (x < y).
+ if (kDebugMode && should_try_cas != (x < y)) {
+ // We would usually use PRIdPTR here, but is not correctly implemented
+ // within the android toolchain.
+ ABSL_RAW_LOG(FATAL, "internal logic error %llx %llx %llx\n",
+ static_cast<long long>(v), static_cast<long long>(x),
+ static_cast<long long>(y));
+ }
+ if (x < y &&
+ mu_.compare_exchange_strong(v, v & ~(kMuWrWait | kMuWriter),
+ std::memory_order_release,
+ std::memory_order_relaxed)) {
+ // fast writer release (writer with no waiters or with designated waker)
+ } else {
+ this->UnlockSlow(nullptr /*no waitp*/); // take slow path
+ }
+ ABSL_TSAN_MUTEX_POST_UNLOCK(this, 0);
+}
+
+// Requires v to represent a reader-locked state.
+static bool ExactlyOneReader(intptr_t v) {
+ assert((v & (kMuWriter|kMuReader)) == kMuReader);
+ assert((v & kMuHigh) != 0);
+ // The more straightforward "(v & kMuHigh) == kMuOne" also works, but
+ // on some architectures the following generates slightly smaller code.
+ // It may be faster too.
+ constexpr intptr_t kMuMultipleWaitersMask = kMuHigh ^ kMuOne;
+ return (v & kMuMultipleWaitersMask) == 0;
+}
+
+ABSL_XRAY_LOG_ARGS(1) void Mutex::ReaderUnlock() {
+ ABSL_TSAN_MUTEX_PRE_UNLOCK(this, __tsan_mutex_read_lock);
+ DebugOnlyLockLeave(this);
+ intptr_t v = mu_.load(std::memory_order_relaxed);
+ assert((v & (kMuWriter|kMuReader)) == kMuReader);
+ if ((v & (kMuReader|kMuWait|kMuEvent)) == kMuReader) {
+ // fast reader release (reader with no waiters)
+ intptr_t clear = ExactlyOneReader(v) ? kMuReader|kMuOne : kMuOne;
+ if (mu_.compare_exchange_strong(v, v - clear,
+ std::memory_order_release,
+ std::memory_order_relaxed)) {
+ ABSL_TSAN_MUTEX_POST_UNLOCK(this, __tsan_mutex_read_lock);
+ return;
+ }
+ }
+ this->UnlockSlow(nullptr /*no waitp*/); // take slow path
+ ABSL_TSAN_MUTEX_POST_UNLOCK(this, __tsan_mutex_read_lock);
+}
+
+// The zap_desig_waker bitmask is used to clear the designated waker flag in
+// the mutex if this thread has blocked, and therefore may be the designated
+// waker.
+static const intptr_t zap_desig_waker[] = {
+ ~static_cast<intptr_t>(0), // not blocked
+ ~static_cast<intptr_t>(
+ kMuDesig) // blocked; turn off the designated waker bit
+};
+
+// The ignore_waiting_writers bitmask is used to ignore the existence
+// of waiting writers if a reader that has already blocked once
+// wakes up.
+static const intptr_t ignore_waiting_writers[] = {
+ ~static_cast<intptr_t>(0), // not blocked
+ ~static_cast<intptr_t>(
+ kMuWrWait) // blocked; pretend there are no waiting writers
+};
+
+// Internal version of LockWhen(). See LockSlowWithDeadline()
+ABSL_ATTRIBUTE_NOINLINE void Mutex::LockSlow(MuHow how, const Condition *cond,
+ int flags) {
+ ABSL_RAW_CHECK(
+ this->LockSlowWithDeadline(how, cond, KernelTimeout::Never(), flags),
+ "condition untrue on return from LockSlow");
+}
+
+// Compute cond->Eval() and tell race detectors that we do it under mutex mu.
+static inline bool EvalConditionAnnotated(const Condition *cond, Mutex *mu,
+ bool locking, bool trylock,
+ bool read_lock) {
+ // Delicate annotation dance.
+ // We are currently inside of read/write lock/unlock operation.
+ // All memory accesses are ignored inside of mutex operations + for unlock
+ // operation tsan considers that we've already released the mutex.
+ bool res = false;
+#ifdef ABSL_INTERNAL_HAVE_TSAN_INTERFACE
+ const int flags = read_lock ? __tsan_mutex_read_lock : 0;
+ const int tryflags = flags | (trylock ? __tsan_mutex_try_lock : 0);
+#endif
+ if (locking) {
+ // For lock we pretend that we have finished the operation,
+ // evaluate the predicate, then unlock the mutex and start locking it again
+ // to match the annotation at the end of outer lock operation.
+ // Note: we can't simply do POST_LOCK, Eval, PRE_LOCK, because then tsan
+ // will think the lock acquisition is recursive which will trigger
+ // deadlock detector.
+ ABSL_TSAN_MUTEX_POST_LOCK(mu, tryflags, 0);
+ res = cond->Eval();
+ // There is no "try" version of Unlock, so use flags instead of tryflags.
+ ABSL_TSAN_MUTEX_PRE_UNLOCK(mu, flags);
+ ABSL_TSAN_MUTEX_POST_UNLOCK(mu, flags);
+ ABSL_TSAN_MUTEX_PRE_LOCK(mu, tryflags);
+ } else {
+ // Similarly, for unlock we pretend that we have unlocked the mutex,
+ // lock the mutex, evaluate the predicate, and start unlocking it again
+ // to match the annotation at the end of outer unlock operation.
+ ABSL_TSAN_MUTEX_POST_UNLOCK(mu, flags);
+ ABSL_TSAN_MUTEX_PRE_LOCK(mu, flags);
+ ABSL_TSAN_MUTEX_POST_LOCK(mu, flags, 0);
+ res = cond->Eval();
+ ABSL_TSAN_MUTEX_PRE_UNLOCK(mu, flags);
+ }
+ // Prevent unused param warnings in non-TSAN builds.
+ static_cast<void>(mu);
+ static_cast<void>(trylock);
+ static_cast<void>(read_lock);
+ return res;
+}
+
+// Compute cond->Eval() hiding it from race detectors.
+// We are hiding it because inside of UnlockSlow we can evaluate a predicate
+// that was just added by a concurrent Lock operation; Lock adds the predicate
+// to the internal Mutex list without actually acquiring the Mutex
+// (it only acquires the internal spinlock, which is rightfully invisible for
+// tsan). As the result there is no tsan-visible synchronization between the
+// addition and this thread. So if we would enable race detection here,
+// it would race with the predicate initialization.
+static inline bool EvalConditionIgnored(Mutex *mu, const Condition *cond) {
+ // Memory accesses are already ignored inside of lock/unlock operations,
+ // but synchronization operations are also ignored. When we evaluate the
+ // predicate we must ignore only memory accesses but not synchronization,
+ // because missed synchronization can lead to false reports later.
+ // So we "divert" (which un-ignores both memory accesses and synchronization)
+ // and then separately turn on ignores of memory accesses.
+ ABSL_TSAN_MUTEX_PRE_DIVERT(mu, 0);
+ ABSL_ANNOTATE_IGNORE_READS_AND_WRITES_BEGIN();
+ bool res = cond->Eval();
+ ABSL_ANNOTATE_IGNORE_READS_AND_WRITES_END();
+ ABSL_TSAN_MUTEX_POST_DIVERT(mu, 0);
+ static_cast<void>(mu); // Prevent unused param warning in non-TSAN builds.
+ return res;
+}
+
+// Internal equivalent of *LockWhenWithDeadline(), where
+// "t" represents the absolute timeout; !t.has_timeout() means "forever".
+// "how" is "kShared" (for ReaderLockWhen) or "kExclusive" (for LockWhen)
+// In flags, bits are ored together:
+// - kMuHasBlocked indicates that the client has already blocked on the call so
+// the designated waker bit must be cleared and waiting writers should not
+// obstruct this call
+// - kMuIsCond indicates that this is a conditional acquire (condition variable,
+// Await, LockWhen) so contention profiling should be suppressed.
+bool Mutex::LockSlowWithDeadline(MuHow how, const Condition *cond,
+ KernelTimeout t, int flags) {
+ intptr_t v = mu_.load(std::memory_order_relaxed);
+ bool unlock = false;
+ if ((v & how->fast_need_zero) == 0 && // try fast acquire
+ mu_.compare_exchange_strong(
+ v, (how->fast_or | (v & zap_desig_waker[flags & kMuHasBlocked])) +
+ how->fast_add,
+ std::memory_order_acquire, std::memory_order_relaxed)) {
+ if (cond == nullptr ||
+ EvalConditionAnnotated(cond, this, true, false, how == kShared)) {
+ return true;
+ }
+ unlock = true;
+ }
+ SynchWaitParams waitp(
+ how, cond, t, nullptr /*no cvmu*/, Synch_GetPerThreadAnnotated(this),
+ nullptr /*no cv_word*/);
+ if (!Condition::GuaranteedEqual(cond, nullptr)) {
+ flags |= kMuIsCond;
+ }
+ if (unlock) {
+ this->UnlockSlow(&waitp);
+ this->Block(waitp.thread);
+ flags |= kMuHasBlocked;
+ }
+ this->LockSlowLoop(&waitp, flags);
+ return waitp.cond != nullptr || // => cond known true from LockSlowLoop
+ cond == nullptr ||
+ EvalConditionAnnotated(cond, this, true, false, how == kShared);
+}
+
+// RAW_CHECK_FMT() takes a condition, a printf-style format string, and
+// the printf-style argument list. The format string must be a literal.
+// Arguments after the first are not evaluated unless the condition is true.
+#define RAW_CHECK_FMT(cond, ...) \
+ do { \
+ if (ABSL_PREDICT_FALSE(!(cond))) { \
+ ABSL_RAW_LOG(FATAL, "Check " #cond " failed: " __VA_ARGS__); \
+ } \
+ } while (0)
+
+static void CheckForMutexCorruption(intptr_t v, const char* label) {
+ // Test for either of two situations that should not occur in v:
+ // kMuWriter and kMuReader
+ // kMuWrWait and !kMuWait
+ const uintptr_t w = v ^ kMuWait;
+ // By flipping that bit, we can now test for:
+ // kMuWriter and kMuReader in w
+ // kMuWrWait and kMuWait in w
+ // We've chosen these two pairs of values to be so that they will overlap,
+ // respectively, when the word is left shifted by three. This allows us to
+ // save a branch in the common (correct) case of them not being coincident.
+ static_assert(kMuReader << 3 == kMuWriter, "must match");
+ static_assert(kMuWait << 3 == kMuWrWait, "must match");
+ if (ABSL_PREDICT_TRUE((w & (w << 3) & (kMuWriter | kMuWrWait)) == 0)) return;
+ RAW_CHECK_FMT((v & (kMuWriter | kMuReader)) != (kMuWriter | kMuReader),
+ "%s: Mutex corrupt: both reader and writer lock held: %p",
+ label, reinterpret_cast<void *>(v));
+ RAW_CHECK_FMT((v & (kMuWait | kMuWrWait)) != kMuWrWait,
+ "%s: Mutex corrupt: waiting writer with no waiters: %p",
+ label, reinterpret_cast<void *>(v));
+ assert(false);
+}
+
+void Mutex::LockSlowLoop(SynchWaitParams *waitp, int flags) {
+ SchedulingGuard::ScopedDisable disable_rescheduling;
+ int c = 0;
+ intptr_t v = mu_.load(std::memory_order_relaxed);
+ if ((v & kMuEvent) != 0) {
+ PostSynchEvent(this,
+ waitp->how == kExclusive? SYNCH_EV_LOCK: SYNCH_EV_READERLOCK);
+ }
+ ABSL_RAW_CHECK(
+ waitp->thread->waitp == nullptr || waitp->thread->suppress_fatal_errors,
+ "detected illegal recursion into Mutex code");
+ for (;;) {
+ v = mu_.load(std::memory_order_relaxed);
+ CheckForMutexCorruption(v, "Lock");
+ if ((v & waitp->how->slow_need_zero) == 0) {
+ if (mu_.compare_exchange_strong(
+ v, (waitp->how->fast_or |
+ (v & zap_desig_waker[flags & kMuHasBlocked])) +
+ waitp->how->fast_add,
+ std::memory_order_acquire, std::memory_order_relaxed)) {
+ if (waitp->cond == nullptr ||
+ EvalConditionAnnotated(waitp->cond, this, true, false,
+ waitp->how == kShared)) {
+ break; // we timed out, or condition true, so return
+ }
+ this->UnlockSlow(waitp); // got lock but condition false
+ this->Block(waitp->thread);
+ flags |= kMuHasBlocked;
+ c = 0;
+ }
+ } else { // need to access waiter list
+ bool dowait = false;
+ if ((v & (kMuSpin|kMuWait)) == 0) { // no waiters
+ // This thread tries to become the one and only waiter.
+ PerThreadSynch *new_h = Enqueue(nullptr, waitp, v, flags);
+ intptr_t nv = (v & zap_desig_waker[flags & kMuHasBlocked] & kMuLow) |
+ kMuWait;
+ ABSL_RAW_CHECK(new_h != nullptr, "Enqueue to empty list failed");
+ if (waitp->how == kExclusive && (v & kMuReader) != 0) {
+ nv |= kMuWrWait;
+ }
+ if (mu_.compare_exchange_strong(
+ v, reinterpret_cast<intptr_t>(new_h) | nv,
+ std::memory_order_release, std::memory_order_relaxed)) {
+ dowait = true;
+ } else { // attempted Enqueue() failed
+ // zero out the waitp field set by Enqueue()
+ waitp->thread->waitp = nullptr;
+ }
+ } else if ((v & waitp->how->slow_inc_need_zero &
+ ignore_waiting_writers[flags & kMuHasBlocked]) == 0) {
+ // This is a reader that needs to increment the reader count,
+ // but the count is currently held in the last waiter.
+ if (mu_.compare_exchange_strong(
+ v, (v & zap_desig_waker[flags & kMuHasBlocked]) | kMuSpin |
+ kMuReader,
+ std::memory_order_acquire, std::memory_order_relaxed)) {
+ PerThreadSynch *h = GetPerThreadSynch(v);
+ h->readers += kMuOne; // inc reader count in waiter
+ do { // release spinlock
+ v = mu_.load(std::memory_order_relaxed);
+ } while (!mu_.compare_exchange_weak(v, (v & ~kMuSpin) | kMuReader,
+ std::memory_order_release,
+ std::memory_order_relaxed));
+ if (waitp->cond == nullptr ||
+ EvalConditionAnnotated(waitp->cond, this, true, false,
+ waitp->how == kShared)) {
+ break; // we timed out, or condition true, so return
+ }
+ this->UnlockSlow(waitp); // got lock but condition false
+ this->Block(waitp->thread);
+ flags |= kMuHasBlocked;
+ c = 0;
+ }
+ } else if ((v & kMuSpin) == 0 && // attempt to queue ourselves
+ mu_.compare_exchange_strong(
+ v, (v & zap_desig_waker[flags & kMuHasBlocked]) | kMuSpin |
+ kMuWait,
+ std::memory_order_acquire, std::memory_order_relaxed)) {
+ PerThreadSynch *h = GetPerThreadSynch(v);
+ PerThreadSynch *new_h = Enqueue(h, waitp, v, flags);
+ intptr_t wr_wait = 0;
+ ABSL_RAW_CHECK(new_h != nullptr, "Enqueue to list failed");
+ if (waitp->how == kExclusive && (v & kMuReader) != 0) {
+ wr_wait = kMuWrWait; // give priority to a waiting writer
+ }
+ do { // release spinlock
+ v = mu_.load(std::memory_order_relaxed);
+ } while (!mu_.compare_exchange_weak(
+ v, (v & (kMuLow & ~kMuSpin)) | kMuWait | wr_wait |
+ reinterpret_cast<intptr_t>(new_h),
+ std::memory_order_release, std::memory_order_relaxed));
+ dowait = true;
+ }
+ if (dowait) {
+ this->Block(waitp->thread); // wait until removed from list or timeout
+ flags |= kMuHasBlocked;
+ c = 0;
+ }
+ }
+ ABSL_RAW_CHECK(
+ waitp->thread->waitp == nullptr || waitp->thread->suppress_fatal_errors,
+ "detected illegal recursion into Mutex code");
+ // delay, then try again
+ c = synchronization_internal::MutexDelay(c, GENTLE);
+ }
+ ABSL_RAW_CHECK(
+ waitp->thread->waitp == nullptr || waitp->thread->suppress_fatal_errors,
+ "detected illegal recursion into Mutex code");
+ if ((v & kMuEvent) != 0) {
+ PostSynchEvent(this,
+ waitp->how == kExclusive? SYNCH_EV_LOCK_RETURNING :
+ SYNCH_EV_READERLOCK_RETURNING);
+ }
+}
+
+// Unlock this mutex, which is held by the current thread.
+// If waitp is non-zero, it must be the wait parameters for the current thread
+// which holds the lock but is not runnable because its condition is false
+// or it is in the process of blocking on a condition variable; it must requeue
+// itself on the mutex/condvar to wait for its condition to become true.
+ABSL_ATTRIBUTE_NOINLINE void Mutex::UnlockSlow(SynchWaitParams *waitp) {
+ SchedulingGuard::ScopedDisable disable_rescheduling;
+ intptr_t v = mu_.load(std::memory_order_relaxed);
+ this->AssertReaderHeld();
+ CheckForMutexCorruption(v, "Unlock");
+ if ((v & kMuEvent) != 0) {
+ PostSynchEvent(this,
+ (v & kMuWriter) != 0? SYNCH_EV_UNLOCK: SYNCH_EV_READERUNLOCK);
+ }
+ int c = 0;
+ // the waiter under consideration to wake, or zero
+ PerThreadSynch *w = nullptr;
+ // the predecessor to w or zero
+ PerThreadSynch *pw = nullptr;
+ // head of the list searched previously, or zero
+ PerThreadSynch *old_h = nullptr;
+ // a condition that's known to be false.
+ const Condition *known_false = nullptr;
+ PerThreadSynch *wake_list = kPerThreadSynchNull; // list of threads to wake
+ intptr_t wr_wait = 0; // set to kMuWrWait if we wake a reader and a
+ // later writer could have acquired the lock
+ // (starvation avoidance)
+ ABSL_RAW_CHECK(waitp == nullptr || waitp->thread->waitp == nullptr ||
+ waitp->thread->suppress_fatal_errors,
+ "detected illegal recursion into Mutex code");
+ // This loop finds threads wake_list to wakeup if any, and removes them from
+ // the list of waiters. In addition, it places waitp.thread on the queue of
+ // waiters if waitp is non-zero.
+ for (;;) {
+ v = mu_.load(std::memory_order_relaxed);
+ if ((v & kMuWriter) != 0 && (v & (kMuWait | kMuDesig)) != kMuWait &&
+ waitp == nullptr) {
+ // fast writer release (writer with no waiters or with designated waker)
+ if (mu_.compare_exchange_strong(v, v & ~(kMuWrWait | kMuWriter),
+ std::memory_order_release,
+ std::memory_order_relaxed)) {
+ return;
+ }
+ } else if ((v & (kMuReader | kMuWait)) == kMuReader && waitp == nullptr) {
+ // fast reader release (reader with no waiters)
+ intptr_t clear = ExactlyOneReader(v) ? kMuReader | kMuOne : kMuOne;
+ if (mu_.compare_exchange_strong(v, v - clear,
+ std::memory_order_release,
+ std::memory_order_relaxed)) {
+ return;
+ }
+ } else if ((v & kMuSpin) == 0 && // attempt to get spinlock
+ mu_.compare_exchange_strong(v, v | kMuSpin,
+ std::memory_order_acquire,
+ std::memory_order_relaxed)) {
+ if ((v & kMuWait) == 0) { // no one to wake
+ intptr_t nv;
+ bool do_enqueue = true; // always Enqueue() the first time
+ ABSL_RAW_CHECK(waitp != nullptr,
+ "UnlockSlow is confused"); // about to sleep
+ do { // must loop to release spinlock as reader count may change
+ v = mu_.load(std::memory_order_relaxed);
+ // decrement reader count if there are readers
+ intptr_t new_readers = (v >= kMuOne)? v - kMuOne : v;
+ PerThreadSynch *new_h = nullptr;
+ if (do_enqueue) {
+ // If we are enqueuing on a CondVar (waitp->cv_word != nullptr) then
+ // we must not retry here. The initial attempt will always have
+ // succeeded, further attempts would enqueue us against *this due to
+ // Fer() handling.
+ do_enqueue = (waitp->cv_word == nullptr);
+ new_h = Enqueue(nullptr, waitp, new_readers, kMuIsCond);
+ }
+ intptr_t clear = kMuWrWait | kMuWriter; // by default clear write bit
+ if ((v & kMuWriter) == 0 && ExactlyOneReader(v)) { // last reader
+ clear = kMuWrWait | kMuReader; // clear read bit
+ }
+ nv = (v & kMuLow & ~clear & ~kMuSpin);
+ if (new_h != nullptr) {
+ nv |= kMuWait | reinterpret_cast<intptr_t>(new_h);
+ } else { // new_h could be nullptr if we queued ourselves on a
+ // CondVar
+ // In that case, we must place the reader count back in the mutex
+ // word, as Enqueue() did not store it in the new waiter.
+ nv |= new_readers & kMuHigh;
+ }
+ // release spinlock & our lock; retry if reader-count changed
+ // (writer count cannot change since we hold lock)
+ } while (!mu_.compare_exchange_weak(v, nv,
+ std::memory_order_release,
+ std::memory_order_relaxed));
+ break;
+ }
+
+ // There are waiters.
+ // Set h to the head of the circular waiter list.
+ PerThreadSynch *h = GetPerThreadSynch(v);
+ if ((v & kMuReader) != 0 && (h->readers & kMuHigh) > kMuOne) {
+ // a reader but not the last
+ h->readers -= kMuOne; // release our lock
+ intptr_t nv = v; // normally just release spinlock
+ if (waitp != nullptr) { // but waitp!=nullptr => must queue ourselves
+ PerThreadSynch *new_h = Enqueue(h, waitp, v, kMuIsCond);
+ ABSL_RAW_CHECK(new_h != nullptr,
+ "waiters disappeared during Enqueue()!");
+ nv &= kMuLow;
+ nv |= kMuWait | reinterpret_cast<intptr_t>(new_h);
+ }
+ mu_.store(nv, std::memory_order_release); // release spinlock
+ // can release with a store because there were waiters
+ break;
+ }
+
+ // Either we didn't search before, or we marked the queue
+ // as "maybe_unlocking" and no one else should have changed it.
+ ABSL_RAW_CHECK(old_h == nullptr || h->maybe_unlocking,
+ "Mutex queue changed beneath us");
+
+ // The lock is becoming free, and there's a waiter
+ if (old_h != nullptr &&
+ !old_h->may_skip) { // we used old_h as a terminator
+ old_h->may_skip = true; // allow old_h to skip once more
+ ABSL_RAW_CHECK(old_h->skip == nullptr, "illegal skip from head");
+ if (h != old_h && MuSameCondition(old_h, old_h->next)) {
+ old_h->skip = old_h->next; // old_h not head & can skip to successor
+ }
+ }
+ if (h->next->waitp->how == kExclusive &&
+ Condition::GuaranteedEqual(h->next->waitp->cond, nullptr)) {
+ // easy case: writer with no condition; no need to search
+ pw = h; // wake w, the successor of h (=pw)
+ w = h->next;
+ w->wake = true;
+ // We are waking up a writer. This writer may be racing against
+ // an already awake reader for the lock. We want the
+ // writer to usually win this race,
+ // because if it doesn't, we can potentially keep taking a reader
+ // perpetually and writers will starve. Worse than
+ // that, this can also starve other readers if kMuWrWait gets set
+ // later.
+ wr_wait = kMuWrWait;
+ } else if (w != nullptr && (w->waitp->how == kExclusive || h == old_h)) {
+ // we found a waiter w to wake on a previous iteration and either it's
+ // a writer, or we've searched the entire list so we have all the
+ // readers.
+ if (pw == nullptr) { // if w's predecessor is unknown, it must be h
+ pw = h;
+ }
+ } else {
+ // At this point we don't know all the waiters to wake, and the first
+ // waiter has a condition or is a reader. We avoid searching over
+ // waiters we've searched on previous iterations by starting at
+ // old_h if it's set. If old_h==h, there's no one to wakeup at all.
+ if (old_h == h) { // we've searched before, and nothing's new
+ // so there's no one to wake.
+ intptr_t nv = (v & ~(kMuReader|kMuWriter|kMuWrWait));
+ h->readers = 0;
+ h->maybe_unlocking = false; // finished unlocking
+ if (waitp != nullptr) { // we must queue ourselves and sleep
+ PerThreadSynch *new_h = Enqueue(h, waitp, v, kMuIsCond);
+ nv &= kMuLow;
+ if (new_h != nullptr) {
+ nv |= kMuWait | reinterpret_cast<intptr_t>(new_h);
+ } // else new_h could be nullptr if we queued ourselves on a
+ // CondVar
+ }
+ // release spinlock & lock
+ // can release with a store because there were waiters
+ mu_.store(nv, std::memory_order_release);
+ break;
+ }
+
+ // set up to walk the list
+ PerThreadSynch *w_walk; // current waiter during list walk
+ PerThreadSynch *pw_walk; // previous waiter during list walk
+ if (old_h != nullptr) { // we've searched up to old_h before
+ pw_walk = old_h;
+ w_walk = old_h->next;
+ } else { // no prior search, start at beginning
+ pw_walk =
+ nullptr; // h->next's predecessor may change; don't record it
+ w_walk = h->next;
+ }
+
+ h->may_skip = false; // ensure we never skip past h in future searches
+ // even if other waiters are queued after it.
+ ABSL_RAW_CHECK(h->skip == nullptr, "illegal skip from head");
+
+ h->maybe_unlocking = true; // we're about to scan the waiter list
+ // without the spinlock held.
+ // Enqueue must be conservative about
+ // priority queuing.
+
+ // We must release the spinlock to evaluate the conditions.
+ mu_.store(v, std::memory_order_release); // release just spinlock
+ // can release with a store because there were waiters
+
+ // h is the last waiter queued, and w_walk the first unsearched waiter.
+ // Without the spinlock, the locations mu_ and h->next may now change
+ // underneath us, but since we hold the lock itself, the only legal
+ // change is to add waiters between h and w_walk. Therefore, it's safe
+ // to walk the path from w_walk to h inclusive. (TryRemove() can remove
+ // a waiter anywhere, but it acquires both the spinlock and the Mutex)
+
+ old_h = h; // remember we searched to here
+
+ // Walk the path upto and including h looking for waiters we can wake.
+ while (pw_walk != h) {
+ w_walk->wake = false;
+ if (w_walk->waitp->cond ==
+ nullptr || // no condition => vacuously true OR
+ (w_walk->waitp->cond != known_false &&
+ // this thread's condition is not known false, AND
+ // is in fact true
+ EvalConditionIgnored(this, w_walk->waitp->cond))) {
+ if (w == nullptr) {
+ w_walk->wake = true; // can wake this waiter
+ w = w_walk;
+ pw = pw_walk;
+ if (w_walk->waitp->how == kExclusive) {
+ wr_wait = kMuWrWait;
+ break; // bail if waking this writer
+ }
+ } else if (w_walk->waitp->how == kShared) { // wake if a reader
+ w_walk->wake = true;
+ } else { // writer with true condition
+ wr_wait = kMuWrWait;
+ }
+ } else { // can't wake; condition false
+ known_false = w_walk->waitp->cond; // remember last false condition
+ }
+ if (w_walk->wake) { // we're waking reader w_walk
+ pw_walk = w_walk; // don't skip similar waiters
+ } else { // not waking; skip as much as possible
+ pw_walk = Skip(w_walk);
+ }
+ // If pw_walk == h, then load of pw_walk->next can race with
+ // concurrent write in Enqueue(). However, at the same time
+ // we do not need to do the load, because we will bail out
+ // from the loop anyway.
+ if (pw_walk != h) {
+ w_walk = pw_walk->next;
+ }
+ }
+
+ continue; // restart for(;;)-loop to wakeup w or to find more waiters
+ }
+ ABSL_RAW_CHECK(pw->next == w, "pw not w's predecessor");
+ // The first (and perhaps only) waiter we've chosen to wake is w, whose
+ // predecessor is pw. If w is a reader, we must wake all the other
+ // waiters with wake==true as well. We may also need to queue
+ // ourselves if waitp != null. The spinlock and the lock are still
+ // held.
+
+ // This traverses the list in [ pw->next, h ], where h is the head,
+ // removing all elements with wake==true and placing them in the
+ // singly-linked list wake_list. Returns the new head.
+ h = DequeueAllWakeable(h, pw, &wake_list);
+
+ intptr_t nv = (v & kMuEvent) | kMuDesig;
+ // assume no waiters left,
+ // set kMuDesig for INV1a
+
+ if (waitp != nullptr) { // we must queue ourselves and sleep
+ h = Enqueue(h, waitp, v, kMuIsCond);
+ // h is new last waiter; could be null if we queued ourselves on a
+ // CondVar
+ }
+
+ ABSL_RAW_CHECK(wake_list != kPerThreadSynchNull,
+ "unexpected empty wake list");
+
+ if (h != nullptr) { // there are waiters left
+ h->readers = 0;
+ h->maybe_unlocking = false; // finished unlocking
+ nv |= wr_wait | kMuWait | reinterpret_cast<intptr_t>(h);
+ }
+
+ // release both spinlock & lock
+ // can release with a store because there were waiters
+ mu_.store(nv, std::memory_order_release);
+ break; // out of for(;;)-loop
+ }
+ // aggressive here; no one can proceed till we do
+ c = synchronization_internal::MutexDelay(c, AGGRESSIVE);
+ } // end of for(;;)-loop
+
+ if (wake_list != kPerThreadSynchNull) {
+ int64_t enqueue_timestamp = wake_list->waitp->contention_start_cycles;
+ bool cond_waiter = wake_list->cond_waiter;
+ do {
+ wake_list = Wakeup(wake_list); // wake waiters
+ } while (wake_list != kPerThreadSynchNull);
+ if (!cond_waiter) {
+ // Sample lock contention events only if the (first) waiter was trying to
+ // acquire the lock, not waiting on a condition variable or Condition.
+ int64_t wait_cycles =
+ base_internal::CycleClock::Now() - enqueue_timestamp;
+ mutex_tracer("slow release", this, wait_cycles);
+ ABSL_TSAN_MUTEX_PRE_DIVERT(this, 0);
+ submit_profile_data(enqueue_timestamp);
+ ABSL_TSAN_MUTEX_POST_DIVERT(this, 0);
+ }
+ }
+}
+
+// Used by CondVar implementation to reacquire mutex after waking from
+// condition variable. This routine is used instead of Lock() because the
+// waiting thread may have been moved from the condition variable queue to the
+// mutex queue without a wakeup, by Trans(). In that case, when the thread is
+// finally woken, the woken thread will believe it has been woken from the
+// condition variable (i.e. its PC will be in when in the CondVar code), when
+// in fact it has just been woken from the mutex. Thus, it must enter the slow
+// path of the mutex in the same state as if it had just woken from the mutex.
+// That is, it must ensure to clear kMuDesig (INV1b).
+void Mutex::Trans(MuHow how) {
+ this->LockSlow(how, nullptr, kMuHasBlocked | kMuIsCond);
+}
+
+// Used by CondVar implementation to effectively wake thread w from the
+// condition variable. If this mutex is free, we simply wake the thread.
+// It will later acquire the mutex with high probability. Otherwise, we
+// enqueue thread w on this mutex.
+void Mutex::Fer(PerThreadSynch *w) {
+ SchedulingGuard::ScopedDisable disable_rescheduling;
+ int c = 0;
+ ABSL_RAW_CHECK(w->waitp->cond == nullptr,
+ "Mutex::Fer while waiting on Condition");
+ ABSL_RAW_CHECK(!w->waitp->timeout.has_timeout(),
+ "Mutex::Fer while in timed wait");
+ ABSL_RAW_CHECK(w->waitp->cv_word == nullptr,
+ "Mutex::Fer with pending CondVar queueing");
+ for (;;) {
+ intptr_t v = mu_.load(std::memory_order_relaxed);
+ // Note: must not queue if the mutex is unlocked (nobody will wake it).
+ // For example, we can have only kMuWait (conditional) or maybe
+ // kMuWait|kMuWrWait.
+ // conflicting != 0 implies that the waking thread cannot currently take
+ // the mutex, which in turn implies that someone else has it and can wake
+ // us if we queue.
+ const intptr_t conflicting =
+ kMuWriter | (w->waitp->how == kShared ? 0 : kMuReader);
+ if ((v & conflicting) == 0) {
+ w->next = nullptr;
+ w->state.store(PerThreadSynch::kAvailable, std::memory_order_release);
+ IncrementSynchSem(this, w);
+ return;
+ } else {
+ if ((v & (kMuSpin|kMuWait)) == 0) { // no waiters
+ // This thread tries to become the one and only waiter.
+ PerThreadSynch *new_h = Enqueue(nullptr, w->waitp, v, kMuIsCond);
+ ABSL_RAW_CHECK(new_h != nullptr,
+ "Enqueue failed"); // we must queue ourselves
+ if (mu_.compare_exchange_strong(
+ v, reinterpret_cast<intptr_t>(new_h) | (v & kMuLow) | kMuWait,
+ std::memory_order_release, std::memory_order_relaxed)) {
+ return;
+ }
+ } else if ((v & kMuSpin) == 0 &&
+ mu_.compare_exchange_strong(v, v | kMuSpin | kMuWait)) {
+ PerThreadSynch *h = GetPerThreadSynch(v);
+ PerThreadSynch *new_h = Enqueue(h, w->waitp, v, kMuIsCond);
+ ABSL_RAW_CHECK(new_h != nullptr,
+ "Enqueue failed"); // we must queue ourselves
+ do {
+ v = mu_.load(std::memory_order_relaxed);
+ } while (!mu_.compare_exchange_weak(
+ v,
+ (v & kMuLow & ~kMuSpin) | kMuWait |
+ reinterpret_cast<intptr_t>(new_h),
+ std::memory_order_release, std::memory_order_relaxed));
+ return;
+ }
+ }
+ c = synchronization_internal::MutexDelay(c, GENTLE);
+ }
+}
+
+void Mutex::AssertHeld() const {
+ if ((mu_.load(std::memory_order_relaxed) & kMuWriter) == 0) {
+ SynchEvent *e = GetSynchEvent(this);
+ ABSL_RAW_LOG(FATAL, "thread should hold write lock on Mutex %p %s",
+ static_cast<const void *>(this),
+ (e == nullptr ? "" : e->name));
+ }
+}
+
+void Mutex::AssertReaderHeld() const {
+ if ((mu_.load(std::memory_order_relaxed) & (kMuReader | kMuWriter)) == 0) {
+ SynchEvent *e = GetSynchEvent(this);
+ ABSL_RAW_LOG(
+ FATAL, "thread should hold at least a read lock on Mutex %p %s",
+ static_cast<const void *>(this), (e == nullptr ? "" : e->name));
+ }
+}
+
+// -------------------------------- condition variables
+static const intptr_t kCvSpin = 0x0001L; // spinlock protects waiter list
+static const intptr_t kCvEvent = 0x0002L; // record events
+
+static const intptr_t kCvLow = 0x0003L; // low order bits of CV
+
+// Hack to make constant values available to gdb pretty printer
+enum { kGdbCvSpin = kCvSpin, kGdbCvEvent = kCvEvent, kGdbCvLow = kCvLow, };
+
+static_assert(PerThreadSynch::kAlignment > kCvLow,
+ "PerThreadSynch::kAlignment must be greater than kCvLow");
+
+void CondVar::EnableDebugLog(const char *name) {
+ SynchEvent *e = EnsureSynchEvent(&this->cv_, name, kCvEvent, kCvSpin);
+ e->log = true;
+ UnrefSynchEvent(e);
+}
+
+CondVar::~CondVar() {
+ if ((cv_.load(std::memory_order_relaxed) & kCvEvent) != 0) {
+ ForgetSynchEvent(&this->cv_, kCvEvent, kCvSpin);
+ }
+}
+
+
+// Remove thread s from the list of waiters on this condition variable.
+void CondVar::Remove(PerThreadSynch *s) {
+ SchedulingGuard::ScopedDisable disable_rescheduling;
+ intptr_t v;
+ int c = 0;
+ for (v = cv_.load(std::memory_order_relaxed);;
+ v = cv_.load(std::memory_order_relaxed)) {
+ if ((v & kCvSpin) == 0 && // attempt to acquire spinlock
+ cv_.compare_exchange_strong(v, v | kCvSpin,
+ std::memory_order_acquire,
+ std::memory_order_relaxed)) {
+ PerThreadSynch *h = reinterpret_cast<PerThreadSynch *>(v & ~kCvLow);
+ if (h != nullptr) {
+ PerThreadSynch *w = h;
+ while (w->next != s && w->next != h) { // search for thread
+ w = w->next;
+ }
+ if (w->next == s) { // found thread; remove it
+ w->next = s->next;
+ if (h == s) {
+ h = (w == s) ? nullptr : w;
+ }
+ s->next = nullptr;
+ s->state.store(PerThreadSynch::kAvailable, std::memory_order_release);
+ }
+ }
+ // release spinlock
+ cv_.store((v & kCvEvent) | reinterpret_cast<intptr_t>(h),
+ std::memory_order_release);
+ return;
+ } else {
+ // try again after a delay
+ c = synchronization_internal::MutexDelay(c, GENTLE);
+ }
+ }
+}
+
+// Queue thread waitp->thread on condition variable word cv_word using
+// wait parameters waitp.
+// We split this into a separate routine, rather than simply doing it as part
+// of WaitCommon(). If we were to queue ourselves on the condition variable
+// before calling Mutex::UnlockSlow(), the Mutex code might be re-entered (via
+// the logging code, or via a Condition function) and might potentially attempt
+// to block this thread. That would be a problem if the thread were already on
+// a the condition variable waiter queue. Thus, we use the waitp->cv_word
+// to tell the unlock code to call CondVarEnqueue() to queue the thread on the
+// condition variable queue just before the mutex is to be unlocked, and (most
+// importantly) after any call to an external routine that might re-enter the
+// mutex code.
+static void CondVarEnqueue(SynchWaitParams *waitp) {
+ // This thread might be transferred to the Mutex queue by Fer() when
+ // we are woken. To make sure that is what happens, Enqueue() doesn't
+ // call CondVarEnqueue() again but instead uses its normal code. We
+ // must do this before we queue ourselves so that cv_word will be null
+ // when seen by the dequeuer, who may wish immediately to requeue
+ // this thread on another queue.
+ std::atomic<intptr_t> *cv_word = waitp->cv_word;
+ waitp->cv_word = nullptr;
+
+ intptr_t v = cv_word->load(std::memory_order_relaxed);
+ int c = 0;
+ while ((v & kCvSpin) != 0 || // acquire spinlock
+ !cv_word->compare_exchange_weak(v, v | kCvSpin,
+ std::memory_order_acquire,
+ std::memory_order_relaxed)) {
+ c = synchronization_internal::MutexDelay(c, GENTLE);
+ v = cv_word->load(std::memory_order_relaxed);
+ }
+ ABSL_RAW_CHECK(waitp->thread->waitp == nullptr, "waiting when shouldn't be");
+ waitp->thread->waitp = waitp; // prepare ourselves for waiting
+ PerThreadSynch *h = reinterpret_cast<PerThreadSynch *>(v & ~kCvLow);
+ if (h == nullptr) { // add this thread to waiter list
+ waitp->thread->next = waitp->thread;
+ } else {
+ waitp->thread->next = h->next;
+ h->next = waitp->thread;
+ }
+ waitp->thread->state.store(PerThreadSynch::kQueued,
+ std::memory_order_relaxed);
+ cv_word->store((v & kCvEvent) | reinterpret_cast<intptr_t>(waitp->thread),
+ std::memory_order_release);
+}
+
+bool CondVar::WaitCommon(Mutex *mutex, KernelTimeout t) {
+ bool rc = false; // return value; true iff we timed-out
+
+ intptr_t mutex_v = mutex->mu_.load(std::memory_order_relaxed);
+ Mutex::MuHow mutex_how = ((mutex_v & kMuWriter) != 0) ? kExclusive : kShared;
+ ABSL_TSAN_MUTEX_PRE_UNLOCK(mutex, TsanFlags(mutex_how));
+
+ // maybe trace this call
+ intptr_t v = cv_.load(std::memory_order_relaxed);
+ cond_var_tracer("Wait", this);
+ if ((v & kCvEvent) != 0) {
+ PostSynchEvent(this, SYNCH_EV_WAIT);
+ }
+
+ // Release mu and wait on condition variable.
+ SynchWaitParams waitp(mutex_how, nullptr, t, mutex,
+ Synch_GetPerThreadAnnotated(mutex), &cv_);
+ // UnlockSlow() will call CondVarEnqueue() just before releasing the
+ // Mutex, thus queuing this thread on the condition variable. See
+ // CondVarEnqueue() for the reasons.
+ mutex->UnlockSlow(&waitp);
+
+ // wait for signal
+ while (waitp.thread->state.load(std::memory_order_acquire) ==
+ PerThreadSynch::kQueued) {
+ if (!Mutex::DecrementSynchSem(mutex, waitp.thread, t)) {
+ this->Remove(waitp.thread);
+ rc = true;
+ }
+ }
+
+ ABSL_RAW_CHECK(waitp.thread->waitp != nullptr, "not waiting when should be");
+ waitp.thread->waitp = nullptr; // cleanup
+
+ // maybe trace this call
+ cond_var_tracer("Unwait", this);
+ if ((v & kCvEvent) != 0) {
+ PostSynchEvent(this, SYNCH_EV_WAIT_RETURNING);
+ }
+
+ // From synchronization point of view Wait is unlock of the mutex followed
+ // by lock of the mutex. We've annotated start of unlock in the beginning
+ // of the function. Now, finish unlock and annotate lock of the mutex.
+ // (Trans is effectively lock).
+ ABSL_TSAN_MUTEX_POST_UNLOCK(mutex, TsanFlags(mutex_how));
+ ABSL_TSAN_MUTEX_PRE_LOCK(mutex, TsanFlags(mutex_how));
+ mutex->Trans(mutex_how); // Reacquire mutex
+ ABSL_TSAN_MUTEX_POST_LOCK(mutex, TsanFlags(mutex_how), 0);
+ return rc;
+}
+
+bool CondVar::WaitWithTimeout(Mutex *mu, absl::Duration timeout) {
+ return WaitWithDeadline(mu, DeadlineFromTimeout(timeout));
+}
+
+bool CondVar::WaitWithDeadline(Mutex *mu, absl::Time deadline) {
+ return WaitCommon(mu, KernelTimeout(deadline));
+}
+
+void CondVar::Wait(Mutex *mu) {
+ WaitCommon(mu, KernelTimeout::Never());
+}
+
+// Wake thread w
+// If it was a timed wait, w will be waiting on w->cv
+// Otherwise, if it was not a Mutex mutex, w will be waiting on w->sem
+// Otherwise, w is transferred to the Mutex mutex via Mutex::Fer().
+void CondVar::Wakeup(PerThreadSynch *w) {
+ if (w->waitp->timeout.has_timeout() || w->waitp->cvmu == nullptr) {
+ // The waiting thread only needs to observe "w->state == kAvailable" to be
+ // released, we must cache "cvmu" before clearing "next".
+ Mutex *mu = w->waitp->cvmu;
+ w->next = nullptr;
+ w->state.store(PerThreadSynch::kAvailable, std::memory_order_release);
+ Mutex::IncrementSynchSem(mu, w);
+ } else {
+ w->waitp->cvmu->Fer(w);
+ }
+}
+
+void CondVar::Signal() {
+ SchedulingGuard::ScopedDisable disable_rescheduling;
+ ABSL_TSAN_MUTEX_PRE_SIGNAL(nullptr, 0);
+ intptr_t v;
+ int c = 0;
+ for (v = cv_.load(std::memory_order_relaxed); v != 0;
+ v = cv_.load(std::memory_order_relaxed)) {
+ if ((v & kCvSpin) == 0 && // attempt to acquire spinlock
+ cv_.compare_exchange_strong(v, v | kCvSpin,
+ std::memory_order_acquire,
+ std::memory_order_relaxed)) {
+ PerThreadSynch *h = reinterpret_cast<PerThreadSynch *>(v & ~kCvLow);
+ PerThreadSynch *w = nullptr;
+ if (h != nullptr) { // remove first waiter
+ w = h->next;
+ if (w == h) {
+ h = nullptr;
+ } else {
+ h->next = w->next;
+ }
+ }
+ // release spinlock
+ cv_.store((v & kCvEvent) | reinterpret_cast<intptr_t>(h),
+ std::memory_order_release);
+ if (w != nullptr) {
+ CondVar::Wakeup(w); // wake waiter, if there was one
+ cond_var_tracer("Signal wakeup", this);
+ }
+ if ((v & kCvEvent) != 0) {
+ PostSynchEvent(this, SYNCH_EV_SIGNAL);
+ }
+ ABSL_TSAN_MUTEX_POST_SIGNAL(nullptr, 0);
+ return;
+ } else {
+ c = synchronization_internal::MutexDelay(c, GENTLE);
+ }
+ }
+ ABSL_TSAN_MUTEX_POST_SIGNAL(nullptr, 0);
+}
+
+void CondVar::SignalAll () {
+ ABSL_TSAN_MUTEX_PRE_SIGNAL(nullptr, 0);
+ intptr_t v;
+ int c = 0;
+ for (v = cv_.load(std::memory_order_relaxed); v != 0;
+ v = cv_.load(std::memory_order_relaxed)) {
+ // empty the list if spinlock free
+ // We do this by simply setting the list to empty using
+ // compare and swap. We then have the entire list in our hands,
+ // which cannot be changing since we grabbed it while no one
+ // held the lock.
+ if ((v & kCvSpin) == 0 &&
+ cv_.compare_exchange_strong(v, v & kCvEvent, std::memory_order_acquire,
+ std::memory_order_relaxed)) {
+ PerThreadSynch *h = reinterpret_cast<PerThreadSynch *>(v & ~kCvLow);
+ if (h != nullptr) {
+ PerThreadSynch *w;
+ PerThreadSynch *n = h->next;
+ do { // for every thread, wake it up
+ w = n;
+ n = n->next;
+ CondVar::Wakeup(w);
+ } while (w != h);
+ cond_var_tracer("SignalAll wakeup", this);
+ }
+ if ((v & kCvEvent) != 0) {
+ PostSynchEvent(this, SYNCH_EV_SIGNALALL);
+ }
+ ABSL_TSAN_MUTEX_POST_SIGNAL(nullptr, 0);
+ return;
+ } else {
+ // try again after a delay
+ c = synchronization_internal::MutexDelay(c, GENTLE);
+ }
+ }
+ ABSL_TSAN_MUTEX_POST_SIGNAL(nullptr, 0);
+}
+
+void ReleasableMutexLock::Release() {
+ ABSL_RAW_CHECK(this->mu_ != nullptr,
+ "ReleasableMutexLock::Release may only be called once");
+ this->mu_->Unlock();
+ this->mu_ = nullptr;
+}
+
+#ifdef ABSL_HAVE_THREAD_SANITIZER
+extern "C" void __tsan_read1(void *addr);
+#else
+#define __tsan_read1(addr) // do nothing if TSan not enabled
+#endif
+
+// A function that just returns its argument, dereferenced
+static bool Dereference(void *arg) {
+ // ThreadSanitizer does not instrument this file for memory accesses.
+ // This function dereferences a user variable that can participate
+ // in a data race, so we need to manually tell TSan about this memory access.
+ __tsan_read1(arg);
+ return *(static_cast<bool *>(arg));
+}
+
+Condition::Condition() {} // null constructor, used for kTrue only
+const Condition Condition::kTrue;
+
+Condition::Condition(bool (*func)(void *), void *arg)
+ : eval_(&CallVoidPtrFunction),
+ function_(func),
+ method_(nullptr),
+ arg_(arg) {}
+
+bool Condition::CallVoidPtrFunction(const Condition *c) {
+ return (*c->function_)(c->arg_);
+}
+
+Condition::Condition(const bool *cond)
+ : eval_(CallVoidPtrFunction),
+ function_(Dereference),
+ method_(nullptr),
+ // const_cast is safe since Dereference does not modify arg
+ arg_(const_cast<bool *>(cond)) {}
+
+bool Condition::Eval() const {
+ // eval_ == null for kTrue
+ return (this->eval_ == nullptr) || (*this->eval_)(this);
+}
+
+bool Condition::GuaranteedEqual(const Condition *a, const Condition *b) {
+ if (a == nullptr) {
+ return b == nullptr || b->eval_ == nullptr;
+ }
+ if (b == nullptr || b->eval_ == nullptr) {
+ return a->eval_ == nullptr;
+ }
+ return a->eval_ == b->eval_ && a->function_ == b->function_ &&
+ a->arg_ == b->arg_ && a->method_ == b->method_;
+}
+
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/synchronization/mutex.h b/third_party/abseil/src/absl/synchronization/mutex.h
new file mode 100644
index 0000000..598d1e0
--- /dev/null
+++ b/third_party/abseil/src/absl/synchronization/mutex.h
@@ -0,0 +1,1084 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// mutex.h
+// -----------------------------------------------------------------------------
+//
+// This header file defines a `Mutex` -- a mutually exclusive lock -- and the
+// most common type of synchronization primitive for facilitating locks on
+// shared resources. A mutex is used to prevent multiple threads from accessing
+// and/or writing to a shared resource concurrently.
+//
+// Unlike a `std::mutex`, the Abseil `Mutex` provides the following additional
+// features:
+// * Conditional predicates intrinsic to the `Mutex` object
+// * Shared/reader locks, in addition to standard exclusive/writer locks
+// * Deadlock detection and debug support.
+//
+// The following helper classes are also defined within this file:
+//
+// MutexLock - An RAII wrapper to acquire and release a `Mutex` for exclusive/
+// write access within the current scope.
+//
+// ReaderMutexLock
+// - An RAII wrapper to acquire and release a `Mutex` for shared/read
+// access within the current scope.
+//
+// WriterMutexLock
+// - Effectively an alias for `MutexLock` above, designed for use in
+// distinguishing reader and writer locks within code.
+//
+// In addition to simple mutex locks, this file also defines ways to perform
+// locking under certain conditions.
+//
+// Condition - (Preferred) Used to wait for a particular predicate that
+// depends on state protected by the `Mutex` to become true.
+// CondVar - A lower-level variant of `Condition` that relies on
+// application code to explicitly signal the `CondVar` when
+// a condition has been met.
+//
+// See below for more information on using `Condition` or `CondVar`.
+//
+// Mutexes and mutex behavior can be quite complicated. The information within
+// this header file is limited, as a result. Please consult the Mutex guide for
+// more complete information and examples.
+
+#ifndef ABSL_SYNCHRONIZATION_MUTEX_H_
+#define ABSL_SYNCHRONIZATION_MUTEX_H_
+
+#include <atomic>
+#include <cstdint>
+#include <string>
+
+#include "absl/base/const_init.h"
+#include "absl/base/internal/identity.h"
+#include "absl/base/internal/low_level_alloc.h"
+#include "absl/base/internal/thread_identity.h"
+#include "absl/base/internal/tsan_mutex_interface.h"
+#include "absl/base/port.h"
+#include "absl/base/thread_annotations.h"
+#include "absl/synchronization/internal/kernel_timeout.h"
+#include "absl/synchronization/internal/per_thread_sem.h"
+#include "absl/time/time.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+class Condition;
+struct SynchWaitParams;
+
+// -----------------------------------------------------------------------------
+// Mutex
+// -----------------------------------------------------------------------------
+//
+// A `Mutex` is a non-reentrant (aka non-recursive) Mutually Exclusive lock
+// on some resource, typically a variable or data structure with associated
+// invariants. Proper usage of mutexes prevents concurrent access by different
+// threads to the same resource.
+//
+// A `Mutex` has two basic operations: `Mutex::Lock()` and `Mutex::Unlock()`.
+// The `Lock()` operation *acquires* a `Mutex` (in a state known as an
+// *exclusive* -- or write -- lock), while the `Unlock()` operation *releases* a
+// Mutex. During the span of time between the Lock() and Unlock() operations,
+// a mutex is said to be *held*. By design all mutexes support exclusive/write
+// locks, as this is the most common way to use a mutex.
+//
+// The `Mutex` state machine for basic lock/unlock operations is quite simple:
+//
+// | | Lock() | Unlock() |
+// |----------------+------------+----------|
+// | Free | Exclusive | invalid |
+// | Exclusive | blocks | Free |
+//
+// Attempts to `Unlock()` must originate from the thread that performed the
+// corresponding `Lock()` operation.
+//
+// An "invalid" operation is disallowed by the API. The `Mutex` implementation
+// is allowed to do anything on an invalid call, including but not limited to
+// crashing with a useful error message, silently succeeding, or corrupting
+// data structures. In debug mode, the implementation attempts to crash with a
+// useful error message.
+//
+// `Mutex` is not guaranteed to be "fair" in prioritizing waiting threads; it
+// is, however, approximately fair over long periods, and starvation-free for
+// threads at the same priority.
+//
+// The lock/unlock primitives are now annotated with lock annotations
+// defined in (base/thread_annotations.h). When writing multi-threaded code,
+// you should use lock annotations whenever possible to document your lock
+// synchronization policy. Besides acting as documentation, these annotations
+// also help compilers or static analysis tools to identify and warn about
+// issues that could potentially result in race conditions and deadlocks.
+//
+// For more information about the lock annotations, please see
+// [Thread Safety Analysis](http://clang.llvm.org/docs/ThreadSafetyAnalysis.html)
+// in the Clang documentation.
+//
+// See also `MutexLock`, below, for scoped `Mutex` acquisition.
+
+class ABSL_LOCKABLE Mutex {
+ public:
+ // Creates a `Mutex` that is not held by anyone. This constructor is
+ // typically used for Mutexes allocated on the heap or the stack.
+ //
+ // To create `Mutex` instances with static storage duration
+ // (e.g. a namespace-scoped or global variable), see
+ // `Mutex::Mutex(absl::kConstInit)` below instead.
+ Mutex();
+
+ // Creates a mutex with static storage duration. A global variable
+ // constructed this way avoids the lifetime issues that can occur on program
+ // startup and shutdown. (See absl/base/const_init.h.)
+ //
+ // For Mutexes allocated on the heap and stack, instead use the default
+ // constructor, which can interact more fully with the thread sanitizer.
+ //
+ // Example usage:
+ // namespace foo {
+ // ABSL_CONST_INIT Mutex mu(absl::kConstInit);
+ // }
+ explicit constexpr Mutex(absl::ConstInitType);
+
+ ~Mutex();
+
+ // Mutex::Lock()
+ //
+ // Blocks the calling thread, if necessary, until this `Mutex` is free, and
+ // then acquires it exclusively. (This lock is also known as a "write lock.")
+ void Lock() ABSL_EXCLUSIVE_LOCK_FUNCTION();
+
+ // Mutex::Unlock()
+ //
+ // Releases this `Mutex` and returns it from the exclusive/write state to the
+ // free state. Caller must hold the `Mutex` exclusively.
+ void Unlock() ABSL_UNLOCK_FUNCTION();
+
+ // Mutex::TryLock()
+ //
+ // If the mutex can be acquired without blocking, does so exclusively and
+ // returns `true`. Otherwise, returns `false`. Returns `true` with high
+ // probability if the `Mutex` was free.
+ bool TryLock() ABSL_EXCLUSIVE_TRYLOCK_FUNCTION(true);
+
+ // Mutex::AssertHeld()
+ //
+ // Return immediately if this thread holds the `Mutex` exclusively (in write
+ // mode). Otherwise, may report an error (typically by crashing with a
+ // diagnostic), or may return immediately.
+ void AssertHeld() const ABSL_ASSERT_EXCLUSIVE_LOCK();
+
+ // ---------------------------------------------------------------------------
+ // Reader-Writer Locking
+ // ---------------------------------------------------------------------------
+
+ // A Mutex can also be used as a starvation-free reader-writer lock.
+ // Neither read-locks nor write-locks are reentrant/recursive to avoid
+ // potential client programming errors.
+ //
+ // The Mutex API provides `Writer*()` aliases for the existing `Lock()`,
+ // `Unlock()` and `TryLock()` methods for use within applications mixing
+ // reader/writer locks. Using `Reader*()` and `Writer*()` operations in this
+ // manner can make locking behavior clearer when mixing read and write modes.
+ //
+ // Introducing reader locks necessarily complicates the `Mutex` state
+ // machine somewhat. The table below illustrates the allowed state transitions
+ // of a mutex in such cases. Note that ReaderLock() may block even if the lock
+ // is held in shared mode; this occurs when another thread is blocked on a
+ // call to WriterLock().
+ //
+ // ---------------------------------------------------------------------------
+ // Operation: WriterLock() Unlock() ReaderLock() ReaderUnlock()
+ // ---------------------------------------------------------------------------
+ // State
+ // ---------------------------------------------------------------------------
+ // Free Exclusive invalid Shared(1) invalid
+ // Shared(1) blocks invalid Shared(2) or blocks Free
+ // Shared(n) n>1 blocks invalid Shared(n+1) or blocks Shared(n-1)
+ // Exclusive blocks Free blocks invalid
+ // ---------------------------------------------------------------------------
+ //
+ // In comments below, "shared" refers to a state of Shared(n) for any n > 0.
+
+ // Mutex::ReaderLock()
+ //
+ // Blocks the calling thread, if necessary, until this `Mutex` is either free,
+ // or in shared mode, and then acquires a share of it. Note that
+ // `ReaderLock()` will block if some other thread has an exclusive/writer lock
+ // on the mutex.
+
+ void ReaderLock() ABSL_SHARED_LOCK_FUNCTION();
+
+ // Mutex::ReaderUnlock()
+ //
+ // Releases a read share of this `Mutex`. `ReaderUnlock` may return a mutex to
+ // the free state if this thread holds the last reader lock on the mutex. Note
+ // that you cannot call `ReaderUnlock()` on a mutex held in write mode.
+ void ReaderUnlock() ABSL_UNLOCK_FUNCTION();
+
+ // Mutex::ReaderTryLock()
+ //
+ // If the mutex can be acquired without blocking, acquires this mutex for
+ // shared access and returns `true`. Otherwise, returns `false`. Returns
+ // `true` with high probability if the `Mutex` was free or shared.
+ bool ReaderTryLock() ABSL_SHARED_TRYLOCK_FUNCTION(true);
+
+ // Mutex::AssertReaderHeld()
+ //
+ // Returns immediately if this thread holds the `Mutex` in at least shared
+ // mode (read mode). Otherwise, may report an error (typically by
+ // crashing with a diagnostic), or may return immediately.
+ void AssertReaderHeld() const ABSL_ASSERT_SHARED_LOCK();
+
+ // Mutex::WriterLock()
+ // Mutex::WriterUnlock()
+ // Mutex::WriterTryLock()
+ //
+ // Aliases for `Mutex::Lock()`, `Mutex::Unlock()`, and `Mutex::TryLock()`.
+ //
+ // These methods may be used (along with the complementary `Reader*()`
+ // methods) to distingish simple exclusive `Mutex` usage (`Lock()`,
+ // etc.) from reader/writer lock usage.
+ void WriterLock() ABSL_EXCLUSIVE_LOCK_FUNCTION() { this->Lock(); }
+
+ void WriterUnlock() ABSL_UNLOCK_FUNCTION() { this->Unlock(); }
+
+ bool WriterTryLock() ABSL_EXCLUSIVE_TRYLOCK_FUNCTION(true) {
+ return this->TryLock();
+ }
+
+ // ---------------------------------------------------------------------------
+ // Conditional Critical Regions
+ // ---------------------------------------------------------------------------
+
+ // Conditional usage of a `Mutex` can occur using two distinct paradigms:
+ //
+ // * Use of `Mutex` member functions with `Condition` objects.
+ // * Use of the separate `CondVar` abstraction.
+ //
+ // In general, prefer use of `Condition` and the `Mutex` member functions
+ // listed below over `CondVar`. When there are multiple threads waiting on
+ // distinctly different conditions, however, a battery of `CondVar`s may be
+ // more efficient. This section discusses use of `Condition` objects.
+ //
+ // `Mutex` contains member functions for performing lock operations only under
+ // certain conditions, of class `Condition`. For correctness, the `Condition`
+ // must return a boolean that is a pure function, only of state protected by
+ // the `Mutex`. The condition must be invariant w.r.t. environmental state
+ // such as thread, cpu id, or time, and must be `noexcept`. The condition will
+ // always be invoked with the mutex held in at least read mode, so you should
+ // not block it for long periods or sleep it on a timer.
+ //
+ // Since a condition must not depend directly on the current time, use
+ // `*WithTimeout()` member function variants to make your condition
+ // effectively true after a given duration, or `*WithDeadline()` variants to
+ // make your condition effectively true after a given time.
+ //
+ // The condition function should have no side-effects aside from debug
+ // logging; as a special exception, the function may acquire other mutexes
+ // provided it releases all those that it acquires. (This exception was
+ // required to allow logging.)
+
+ // Mutex::Await()
+ //
+ // Unlocks this `Mutex` and blocks until simultaneously both `cond` is `true`
+ // and this `Mutex` can be reacquired, then reacquires this `Mutex` in the
+ // same mode in which it was previously held. If the condition is initially
+ // `true`, `Await()` *may* skip the release/re-acquire step.
+ //
+ // `Await()` requires that this thread holds this `Mutex` in some mode.
+ void Await(const Condition &cond);
+
+ // Mutex::LockWhen()
+ // Mutex::ReaderLockWhen()
+ // Mutex::WriterLockWhen()
+ //
+ // Blocks until simultaneously both `cond` is `true` and this `Mutex` can
+ // be acquired, then atomically acquires this `Mutex`. `LockWhen()` is
+ // logically equivalent to `*Lock(); Await();` though they may have different
+ // performance characteristics.
+ void LockWhen(const Condition &cond) ABSL_EXCLUSIVE_LOCK_FUNCTION();
+
+ void ReaderLockWhen(const Condition &cond) ABSL_SHARED_LOCK_FUNCTION();
+
+ void WriterLockWhen(const Condition &cond) ABSL_EXCLUSIVE_LOCK_FUNCTION() {
+ this->LockWhen(cond);
+ }
+
+ // ---------------------------------------------------------------------------
+ // Mutex Variants with Timeouts/Deadlines
+ // ---------------------------------------------------------------------------
+
+ // Mutex::AwaitWithTimeout()
+ // Mutex::AwaitWithDeadline()
+ //
+ // Unlocks this `Mutex` and blocks until simultaneously:
+ // - either `cond` is true or the {timeout has expired, deadline has passed}
+ // and
+ // - this `Mutex` can be reacquired,
+ // then reacquire this `Mutex` in the same mode in which it was previously
+ // held, returning `true` iff `cond` is `true` on return.
+ //
+ // If the condition is initially `true`, the implementation *may* skip the
+ // release/re-acquire step and return immediately.
+ //
+ // Deadlines in the past are equivalent to an immediate deadline.
+ // Negative timeouts are equivalent to a zero timeout.
+ //
+ // This method requires that this thread holds this `Mutex` in some mode.
+ bool AwaitWithTimeout(const Condition &cond, absl::Duration timeout);
+
+ bool AwaitWithDeadline(const Condition &cond, absl::Time deadline);
+
+ // Mutex::LockWhenWithTimeout()
+ // Mutex::ReaderLockWhenWithTimeout()
+ // Mutex::WriterLockWhenWithTimeout()
+ //
+ // Blocks until simultaneously both:
+ // - either `cond` is `true` or the timeout has expired, and
+ // - this `Mutex` can be acquired,
+ // then atomically acquires this `Mutex`, returning `true` iff `cond` is
+ // `true` on return.
+ //
+ // Negative timeouts are equivalent to a zero timeout.
+ bool LockWhenWithTimeout(const Condition &cond, absl::Duration timeout)
+ ABSL_EXCLUSIVE_LOCK_FUNCTION();
+ bool ReaderLockWhenWithTimeout(const Condition &cond, absl::Duration timeout)
+ ABSL_SHARED_LOCK_FUNCTION();
+ bool WriterLockWhenWithTimeout(const Condition &cond, absl::Duration timeout)
+ ABSL_EXCLUSIVE_LOCK_FUNCTION() {
+ return this->LockWhenWithTimeout(cond, timeout);
+ }
+
+ // Mutex::LockWhenWithDeadline()
+ // Mutex::ReaderLockWhenWithDeadline()
+ // Mutex::WriterLockWhenWithDeadline()
+ //
+ // Blocks until simultaneously both:
+ // - either `cond` is `true` or the deadline has been passed, and
+ // - this `Mutex` can be acquired,
+ // then atomically acquires this Mutex, returning `true` iff `cond` is `true`
+ // on return.
+ //
+ // Deadlines in the past are equivalent to an immediate deadline.
+ bool LockWhenWithDeadline(const Condition &cond, absl::Time deadline)
+ ABSL_EXCLUSIVE_LOCK_FUNCTION();
+ bool ReaderLockWhenWithDeadline(const Condition &cond, absl::Time deadline)
+ ABSL_SHARED_LOCK_FUNCTION();
+ bool WriterLockWhenWithDeadline(const Condition &cond, absl::Time deadline)
+ ABSL_EXCLUSIVE_LOCK_FUNCTION() {
+ return this->LockWhenWithDeadline(cond, deadline);
+ }
+
+ // ---------------------------------------------------------------------------
+ // Debug Support: Invariant Checking, Deadlock Detection, Logging.
+ // ---------------------------------------------------------------------------
+
+ // Mutex::EnableInvariantDebugging()
+ //
+ // If `invariant`!=null and if invariant debugging has been enabled globally,
+ // cause `(*invariant)(arg)` to be called at moments when the invariant for
+ // this `Mutex` should hold (for example: just after acquire, just before
+ // release).
+ //
+ // The routine `invariant` should have no side-effects since it is not
+ // guaranteed how many times it will be called; it should check the invariant
+ // and crash if it does not hold. Enabling global invariant debugging may
+ // substantially reduce `Mutex` performance; it should be set only for
+ // non-production runs. Optimization options may also disable invariant
+ // checks.
+ void EnableInvariantDebugging(void (*invariant)(void *), void *arg);
+
+ // Mutex::EnableDebugLog()
+ //
+ // Cause all subsequent uses of this `Mutex` to be logged via
+ // `ABSL_RAW_LOG(INFO)`. Log entries are tagged with `name` if no previous
+ // call to `EnableInvariantDebugging()` or `EnableDebugLog()` has been made.
+ //
+ // Note: This method substantially reduces `Mutex` performance.
+ void EnableDebugLog(const char *name);
+
+ // Deadlock detection
+
+ // Mutex::ForgetDeadlockInfo()
+ //
+ // Forget any deadlock-detection information previously gathered
+ // about this `Mutex`. Call this method in debug mode when the lock ordering
+ // of a `Mutex` changes.
+ void ForgetDeadlockInfo();
+
+ // Mutex::AssertNotHeld()
+ //
+ // Return immediately if this thread does not hold this `Mutex` in any
+ // mode; otherwise, may report an error (typically by crashing with a
+ // diagnostic), or may return immediately.
+ //
+ // Currently this check is performed only if all of:
+ // - in debug mode
+ // - SetMutexDeadlockDetectionMode() has been set to kReport or kAbort
+ // - number of locks concurrently held by this thread is not large.
+ // are true.
+ void AssertNotHeld() const;
+
+ // Special cases.
+
+ // A `MuHow` is a constant that indicates how a lock should be acquired.
+ // Internal implementation detail. Clients should ignore.
+ typedef const struct MuHowS *MuHow;
+
+ // Mutex::InternalAttemptToUseMutexInFatalSignalHandler()
+ //
+ // Causes the `Mutex` implementation to prepare itself for re-entry caused by
+ // future use of `Mutex` within a fatal signal handler. This method is
+ // intended for use only for last-ditch attempts to log crash information.
+ // It does not guarantee that attempts to use Mutexes within the handler will
+ // not deadlock; it merely makes other faults less likely.
+ //
+ // WARNING: This routine must be invoked from a signal handler, and the
+ // signal handler must either loop forever or terminate the process.
+ // Attempts to return from (or `longjmp` out of) the signal handler once this
+ // call has been made may cause arbitrary program behaviour including
+ // crashes and deadlocks.
+ static void InternalAttemptToUseMutexInFatalSignalHandler();
+
+ private:
+ std::atomic<intptr_t> mu_; // The Mutex state.
+
+ // Post()/Wait() versus associated PerThreadSem; in class for required
+ // friendship with PerThreadSem.
+ static inline void IncrementSynchSem(Mutex *mu,
+ base_internal::PerThreadSynch *w);
+ static inline bool DecrementSynchSem(
+ Mutex *mu, base_internal::PerThreadSynch *w,
+ synchronization_internal::KernelTimeout t);
+
+ // slow path acquire
+ void LockSlowLoop(SynchWaitParams *waitp, int flags);
+ // wrappers around LockSlowLoop()
+ bool LockSlowWithDeadline(MuHow how, const Condition *cond,
+ synchronization_internal::KernelTimeout t,
+ int flags);
+ void LockSlow(MuHow how, const Condition *cond,
+ int flags) ABSL_ATTRIBUTE_COLD;
+ // slow path release
+ void UnlockSlow(SynchWaitParams *waitp) ABSL_ATTRIBUTE_COLD;
+ // Common code between Await() and AwaitWithTimeout/Deadline()
+ bool AwaitCommon(const Condition &cond,
+ synchronization_internal::KernelTimeout t);
+ // Attempt to remove thread s from queue.
+ void TryRemove(base_internal::PerThreadSynch *s);
+ // Block a thread on mutex.
+ void Block(base_internal::PerThreadSynch *s);
+ // Wake a thread; return successor.
+ base_internal::PerThreadSynch *Wakeup(base_internal::PerThreadSynch *w);
+
+ friend class CondVar; // for access to Trans()/Fer().
+ void Trans(MuHow how); // used for CondVar->Mutex transfer
+ void Fer(
+ base_internal::PerThreadSynch *w); // used for CondVar->Mutex transfer
+
+ // Catch the error of writing Mutex when intending MutexLock.
+ Mutex(const volatile Mutex * /*ignored*/) {} // NOLINT(runtime/explicit)
+
+ Mutex(const Mutex&) = delete;
+ Mutex& operator=(const Mutex&) = delete;
+};
+
+// -----------------------------------------------------------------------------
+// Mutex RAII Wrappers
+// -----------------------------------------------------------------------------
+
+// MutexLock
+//
+// `MutexLock` is a helper class, which acquires and releases a `Mutex` via
+// RAII.
+//
+// Example:
+//
+// Class Foo {
+// public:
+// Foo::Bar* Baz() {
+// MutexLock lock(&mu_);
+// ...
+// return bar;
+// }
+//
+// private:
+// Mutex mu_;
+// };
+class ABSL_SCOPED_LOCKABLE MutexLock {
+ public:
+ // Constructors
+
+ // Calls `mu->Lock()` and returns when that call returns. That is, `*mu` is
+ // guaranteed to be locked when this object is constructed. Requires that
+ // `mu` be dereferenceable.
+ explicit MutexLock(Mutex *mu) ABSL_EXCLUSIVE_LOCK_FUNCTION(mu) : mu_(mu) {
+ this->mu_->Lock();
+ }
+
+ // Like above, but calls `mu->LockWhen(cond)` instead. That is, in addition to
+ // the above, the condition given by `cond` is also guaranteed to hold when
+ // this object is constructed.
+ explicit MutexLock(Mutex *mu, const Condition &cond)
+ ABSL_EXCLUSIVE_LOCK_FUNCTION(mu)
+ : mu_(mu) {
+ this->mu_->LockWhen(cond);
+ }
+
+ MutexLock(const MutexLock &) = delete; // NOLINT(runtime/mutex)
+ MutexLock(MutexLock&&) = delete; // NOLINT(runtime/mutex)
+ MutexLock& operator=(const MutexLock&) = delete;
+ MutexLock& operator=(MutexLock&&) = delete;
+
+ ~MutexLock() ABSL_UNLOCK_FUNCTION() { this->mu_->Unlock(); }
+
+ private:
+ Mutex *const mu_;
+};
+
+// ReaderMutexLock
+//
+// The `ReaderMutexLock` is a helper class, like `MutexLock`, which acquires and
+// releases a shared lock on a `Mutex` via RAII.
+class ABSL_SCOPED_LOCKABLE ReaderMutexLock {
+ public:
+ explicit ReaderMutexLock(Mutex *mu) ABSL_SHARED_LOCK_FUNCTION(mu) : mu_(mu) {
+ mu->ReaderLock();
+ }
+
+ explicit ReaderMutexLock(Mutex *mu, const Condition &cond)
+ ABSL_SHARED_LOCK_FUNCTION(mu)
+ : mu_(mu) {
+ mu->ReaderLockWhen(cond);
+ }
+
+ ReaderMutexLock(const ReaderMutexLock&) = delete;
+ ReaderMutexLock(ReaderMutexLock&&) = delete;
+ ReaderMutexLock& operator=(const ReaderMutexLock&) = delete;
+ ReaderMutexLock& operator=(ReaderMutexLock&&) = delete;
+
+ ~ReaderMutexLock() ABSL_UNLOCK_FUNCTION() { this->mu_->ReaderUnlock(); }
+
+ private:
+ Mutex *const mu_;
+};
+
+// WriterMutexLock
+//
+// The `WriterMutexLock` is a helper class, like `MutexLock`, which acquires and
+// releases a write (exclusive) lock on a `Mutex` via RAII.
+class ABSL_SCOPED_LOCKABLE WriterMutexLock {
+ public:
+ explicit WriterMutexLock(Mutex *mu) ABSL_EXCLUSIVE_LOCK_FUNCTION(mu)
+ : mu_(mu) {
+ mu->WriterLock();
+ }
+
+ explicit WriterMutexLock(Mutex *mu, const Condition &cond)
+ ABSL_EXCLUSIVE_LOCK_FUNCTION(mu)
+ : mu_(mu) {
+ mu->WriterLockWhen(cond);
+ }
+
+ WriterMutexLock(const WriterMutexLock&) = delete;
+ WriterMutexLock(WriterMutexLock&&) = delete;
+ WriterMutexLock& operator=(const WriterMutexLock&) = delete;
+ WriterMutexLock& operator=(WriterMutexLock&&) = delete;
+
+ ~WriterMutexLock() ABSL_UNLOCK_FUNCTION() { this->mu_->WriterUnlock(); }
+
+ private:
+ Mutex *const mu_;
+};
+
+// -----------------------------------------------------------------------------
+// Condition
+// -----------------------------------------------------------------------------
+//
+// As noted above, `Mutex` contains a number of member functions which take a
+// `Condition` as an argument; clients can wait for conditions to become `true`
+// before attempting to acquire the mutex. These sections are known as
+// "condition critical" sections. To use a `Condition`, you simply need to
+// construct it, and use within an appropriate `Mutex` member function;
+// everything else in the `Condition` class is an implementation detail.
+//
+// A `Condition` is specified as a function pointer which returns a boolean.
+// `Condition` functions should be pure functions -- their results should depend
+// only on passed arguments, should not consult any external state (such as
+// clocks), and should have no side-effects, aside from debug logging. Any
+// objects that the function may access should be limited to those which are
+// constant while the mutex is blocked on the condition (e.g. a stack variable),
+// or objects of state protected explicitly by the mutex.
+//
+// No matter which construction is used for `Condition`, the underlying
+// function pointer / functor / callable must not throw any
+// exceptions. Correctness of `Mutex` / `Condition` is not guaranteed in
+// the face of a throwing `Condition`. (When Abseil is allowed to depend
+// on C++17, these function pointers will be explicitly marked
+// `noexcept`; until then this requirement cannot be enforced in the
+// type system.)
+//
+// Note: to use a `Condition`, you need only construct it and pass it to a
+// suitable `Mutex' member function, such as `Mutex::Await()`, or to the
+// constructor of one of the scope guard classes.
+//
+// Example using LockWhen/Unlock:
+//
+// // assume count_ is not internal reference count
+// int count_ ABSL_GUARDED_BY(mu_);
+// Condition count_is_zero(+[](int *count) { return *count == 0; }, &count_);
+//
+// mu_.LockWhen(count_is_zero);
+// // ...
+// mu_.Unlock();
+//
+// Example using a scope guard:
+//
+// {
+// MutexLock lock(&mu_, count_is_zero);
+// // ...
+// }
+//
+// When multiple threads are waiting on exactly the same condition, make sure
+// that they are constructed with the same parameters (same pointer to function
+// + arg, or same pointer to object + method), so that the mutex implementation
+// can avoid redundantly evaluating the same condition for each thread.
+class Condition {
+ public:
+ // A Condition that returns the result of "(*func)(arg)"
+ Condition(bool (*func)(void *), void *arg);
+
+ // Templated version for people who are averse to casts.
+ //
+ // To use a lambda, prepend it with unary plus, which converts the lambda
+ // into a function pointer:
+ // Condition(+[](T* t) { return ...; }, arg).
+ //
+ // Note: lambdas in this case must contain no bound variables.
+ //
+ // See class comment for performance advice.
+ template<typename T>
+ Condition(bool (*func)(T *), T *arg);
+
+ // Templated version for invoking a method that returns a `bool`.
+ //
+ // `Condition(object, &Class::Method)` constructs a `Condition` that evaluates
+ // `object->Method()`.
+ //
+ // Implementation Note: `absl::internal::identity` is used to allow methods to
+ // come from base classes. A simpler signature like
+ // `Condition(T*, bool (T::*)())` does not suffice.
+ template<typename T>
+ Condition(T *object, bool (absl::internal::identity<T>::type::* method)());
+
+ // Same as above, for const members
+ template<typename T>
+ Condition(const T *object,
+ bool (absl::internal::identity<T>::type::* method)() const);
+
+ // A Condition that returns the value of `*cond`
+ explicit Condition(const bool *cond);
+
+ // Templated version for invoking a functor that returns a `bool`.
+ // This approach accepts pointers to non-mutable lambdas, `std::function`,
+ // the result of` std::bind` and user-defined functors that define
+ // `bool F::operator()() const`.
+ //
+ // Example:
+ //
+ // auto reached = [this, current]() {
+ // mu_.AssertReaderHeld(); // For annotalysis.
+ // return processed_ >= current;
+ // };
+ // mu_.Await(Condition(&reached));
+ //
+ // NOTE: never use "mu_.AssertHeld()" instead of "mu_.AssertReaderHeld()" in
+ // the lambda as it may be called when the mutex is being unlocked from a
+ // scope holding only a reader lock, which will make the assertion not
+ // fulfilled and crash the binary.
+
+ // See class comment for performance advice. In particular, if there
+ // might be more than one waiter for the same condition, make sure
+ // that all waiters construct the condition with the same pointers.
+
+ // Implementation note: The second template parameter ensures that this
+ // constructor doesn't participate in overload resolution if T doesn't have
+ // `bool operator() const`.
+ template <typename T, typename E = decltype(
+ static_cast<bool (T::*)() const>(&T::operator()))>
+ explicit Condition(const T *obj)
+ : Condition(obj, static_cast<bool (T::*)() const>(&T::operator())) {}
+
+ // A Condition that always returns `true`.
+ static const Condition kTrue;
+
+ // Evaluates the condition.
+ bool Eval() const;
+
+ // Returns `true` if the two conditions are guaranteed to return the same
+ // value if evaluated at the same time, `false` if the evaluation *may* return
+ // different results.
+ //
+ // Two `Condition` values are guaranteed equal if both their `func` and `arg`
+ // components are the same. A null pointer is equivalent to a `true`
+ // condition.
+ static bool GuaranteedEqual(const Condition *a, const Condition *b);
+
+ private:
+ typedef bool (*InternalFunctionType)(void * arg);
+ typedef bool (Condition::*InternalMethodType)();
+ typedef bool (*InternalMethodCallerType)(void * arg,
+ InternalMethodType internal_method);
+
+ bool (*eval_)(const Condition*); // Actual evaluator
+ InternalFunctionType function_; // function taking pointer returning bool
+ InternalMethodType method_; // method returning bool
+ void *arg_; // arg of function_ or object of method_
+
+ Condition(); // null constructor used only to create kTrue
+
+ // Various functions eval_ can point to:
+ static bool CallVoidPtrFunction(const Condition*);
+ template <typename T> static bool CastAndCallFunction(const Condition* c);
+ template <typename T> static bool CastAndCallMethod(const Condition* c);
+};
+
+// -----------------------------------------------------------------------------
+// CondVar
+// -----------------------------------------------------------------------------
+//
+// A condition variable, reflecting state evaluated separately outside of the
+// `Mutex` object, which can be signaled to wake callers.
+// This class is not normally needed; use `Mutex` member functions such as
+// `Mutex::Await()` and intrinsic `Condition` abstractions. In rare cases
+// with many threads and many conditions, `CondVar` may be faster.
+//
+// The implementation may deliver signals to any condition variable at
+// any time, even when no call to `Signal()` or `SignalAll()` is made; as a
+// result, upon being awoken, you must check the logical condition you have
+// been waiting upon.
+//
+// Examples:
+//
+// Usage for a thread waiting for some condition C protected by mutex mu:
+// mu.Lock();
+// while (!C) { cv->Wait(&mu); } // releases and reacquires mu
+// // C holds; process data
+// mu.Unlock();
+//
+// Usage to wake T is:
+// mu.Lock();
+// // process data, possibly establishing C
+// if (C) { cv->Signal(); }
+// mu.Unlock();
+//
+// If C may be useful to more than one waiter, use `SignalAll()` instead of
+// `Signal()`.
+//
+// With this implementation it is efficient to use `Signal()/SignalAll()` inside
+// the locked region; this usage can make reasoning about your program easier.
+//
+class CondVar {
+ public:
+ // A `CondVar` allocated on the heap or on the stack can use the this
+ // constructor.
+ CondVar();
+ ~CondVar();
+
+ // CondVar::Wait()
+ //
+ // Atomically releases a `Mutex` and blocks on this condition variable.
+ // Waits until awakened by a call to `Signal()` or `SignalAll()` (or a
+ // spurious wakeup), then reacquires the `Mutex` and returns.
+ //
+ // Requires and ensures that the current thread holds the `Mutex`.
+ void Wait(Mutex *mu);
+
+ // CondVar::WaitWithTimeout()
+ //
+ // Atomically releases a `Mutex` and blocks on this condition variable.
+ // Waits until awakened by a call to `Signal()` or `SignalAll()` (or a
+ // spurious wakeup), or until the timeout has expired, then reacquires
+ // the `Mutex` and returns.
+ //
+ // Returns true if the timeout has expired without this `CondVar`
+ // being signalled in any manner. If both the timeout has expired
+ // and this `CondVar` has been signalled, the implementation is free
+ // to return `true` or `false`.
+ //
+ // Requires and ensures that the current thread holds the `Mutex`.
+ bool WaitWithTimeout(Mutex *mu, absl::Duration timeout);
+
+ // CondVar::WaitWithDeadline()
+ //
+ // Atomically releases a `Mutex` and blocks on this condition variable.
+ // Waits until awakened by a call to `Signal()` or `SignalAll()` (or a
+ // spurious wakeup), or until the deadline has passed, then reacquires
+ // the `Mutex` and returns.
+ //
+ // Deadlines in the past are equivalent to an immediate deadline.
+ //
+ // Returns true if the deadline has passed without this `CondVar`
+ // being signalled in any manner. If both the deadline has passed
+ // and this `CondVar` has been signalled, the implementation is free
+ // to return `true` or `false`.
+ //
+ // Requires and ensures that the current thread holds the `Mutex`.
+ bool WaitWithDeadline(Mutex *mu, absl::Time deadline);
+
+ // CondVar::Signal()
+ //
+ // Signal this `CondVar`; wake at least one waiter if one exists.
+ void Signal();
+
+ // CondVar::SignalAll()
+ //
+ // Signal this `CondVar`; wake all waiters.
+ void SignalAll();
+
+ // CondVar::EnableDebugLog()
+ //
+ // Causes all subsequent uses of this `CondVar` to be logged via
+ // `ABSL_RAW_LOG(INFO)`. Log entries are tagged with `name` if `name != 0`.
+ // Note: this method substantially reduces `CondVar` performance.
+ void EnableDebugLog(const char *name);
+
+ private:
+ bool WaitCommon(Mutex *mutex, synchronization_internal::KernelTimeout t);
+ void Remove(base_internal::PerThreadSynch *s);
+ void Wakeup(base_internal::PerThreadSynch *w);
+ std::atomic<intptr_t> cv_; // Condition variable state.
+ CondVar(const CondVar&) = delete;
+ CondVar& operator=(const CondVar&) = delete;
+};
+
+
+// Variants of MutexLock.
+//
+// If you find yourself using one of these, consider instead using
+// Mutex::Unlock() and/or if-statements for clarity.
+
+// MutexLockMaybe
+//
+// MutexLockMaybe is like MutexLock, but is a no-op when mu is null.
+class ABSL_SCOPED_LOCKABLE MutexLockMaybe {
+ public:
+ explicit MutexLockMaybe(Mutex *mu) ABSL_EXCLUSIVE_LOCK_FUNCTION(mu)
+ : mu_(mu) {
+ if (this->mu_ != nullptr) {
+ this->mu_->Lock();
+ }
+ }
+
+ explicit MutexLockMaybe(Mutex *mu, const Condition &cond)
+ ABSL_EXCLUSIVE_LOCK_FUNCTION(mu)
+ : mu_(mu) {
+ if (this->mu_ != nullptr) {
+ this->mu_->LockWhen(cond);
+ }
+ }
+
+ ~MutexLockMaybe() ABSL_UNLOCK_FUNCTION() {
+ if (this->mu_ != nullptr) { this->mu_->Unlock(); }
+ }
+
+ private:
+ Mutex *const mu_;
+ MutexLockMaybe(const MutexLockMaybe&) = delete;
+ MutexLockMaybe(MutexLockMaybe&&) = delete;
+ MutexLockMaybe& operator=(const MutexLockMaybe&) = delete;
+ MutexLockMaybe& operator=(MutexLockMaybe&&) = delete;
+};
+
+// ReleasableMutexLock
+//
+// ReleasableMutexLock is like MutexLock, but permits `Release()` of its
+// mutex before destruction. `Release()` may be called at most once.
+class ABSL_SCOPED_LOCKABLE ReleasableMutexLock {
+ public:
+ explicit ReleasableMutexLock(Mutex *mu) ABSL_EXCLUSIVE_LOCK_FUNCTION(mu)
+ : mu_(mu) {
+ this->mu_->Lock();
+ }
+
+ explicit ReleasableMutexLock(Mutex *mu, const Condition &cond)
+ ABSL_EXCLUSIVE_LOCK_FUNCTION(mu)
+ : mu_(mu) {
+ this->mu_->LockWhen(cond);
+ }
+
+ ~ReleasableMutexLock() ABSL_UNLOCK_FUNCTION() {
+ if (this->mu_ != nullptr) { this->mu_->Unlock(); }
+ }
+
+ void Release() ABSL_UNLOCK_FUNCTION();
+
+ private:
+ Mutex *mu_;
+ ReleasableMutexLock(const ReleasableMutexLock&) = delete;
+ ReleasableMutexLock(ReleasableMutexLock&&) = delete;
+ ReleasableMutexLock& operator=(const ReleasableMutexLock&) = delete;
+ ReleasableMutexLock& operator=(ReleasableMutexLock&&) = delete;
+};
+
+inline Mutex::Mutex() : mu_(0) {
+ ABSL_TSAN_MUTEX_CREATE(this, __tsan_mutex_not_static);
+}
+
+inline constexpr Mutex::Mutex(absl::ConstInitType) : mu_(0) {}
+
+inline CondVar::CondVar() : cv_(0) {}
+
+// static
+template <typename T>
+bool Condition::CastAndCallMethod(const Condition *c) {
+ typedef bool (T::*MemberType)();
+ MemberType rm = reinterpret_cast<MemberType>(c->method_);
+ T *x = static_cast<T *>(c->arg_);
+ return (x->*rm)();
+}
+
+// static
+template <typename T>
+bool Condition::CastAndCallFunction(const Condition *c) {
+ typedef bool (*FuncType)(T *);
+ FuncType fn = reinterpret_cast<FuncType>(c->function_);
+ T *x = static_cast<T *>(c->arg_);
+ return (*fn)(x);
+}
+
+template <typename T>
+inline Condition::Condition(bool (*func)(T *), T *arg)
+ : eval_(&CastAndCallFunction<T>),
+ function_(reinterpret_cast<InternalFunctionType>(func)),
+ method_(nullptr),
+ arg_(const_cast<void *>(static_cast<const void *>(arg))) {}
+
+template <typename T>
+inline Condition::Condition(T *object,
+ bool (absl::internal::identity<T>::type::*method)())
+ : eval_(&CastAndCallMethod<T>),
+ function_(nullptr),
+ method_(reinterpret_cast<InternalMethodType>(method)),
+ arg_(object) {}
+
+template <typename T>
+inline Condition::Condition(const T *object,
+ bool (absl::internal::identity<T>::type::*method)()
+ const)
+ : eval_(&CastAndCallMethod<T>),
+ function_(nullptr),
+ method_(reinterpret_cast<InternalMethodType>(method)),
+ arg_(reinterpret_cast<void *>(const_cast<T *>(object))) {}
+
+// Register a hook for profiling support.
+//
+// The function pointer registered here will be called whenever a mutex is
+// contended. The callback is given the absl/base/cycleclock.h timestamp when
+// waiting began.
+//
+// Calls to this function do not race or block, but there is no ordering
+// guaranteed between calls to this function and call to the provided hook.
+// In particular, the previously registered hook may still be called for some
+// time after this function returns.
+void RegisterMutexProfiler(void (*fn)(int64_t wait_timestamp));
+
+// Register a hook for Mutex tracing.
+//
+// The function pointer registered here will be called whenever a mutex is
+// contended. The callback is given an opaque handle to the contended mutex,
+// an event name, and the number of wait cycles (as measured by
+// //absl/base/internal/cycleclock.h, and which may not be real
+// "cycle" counts.)
+//
+// The only event name currently sent is "slow release".
+//
+// This has the same memory ordering concerns as RegisterMutexProfiler() above.
+void RegisterMutexTracer(void (*fn)(const char *msg, const void *obj,
+ int64_t wait_cycles));
+
+// TODO(gfalcon): Combine RegisterMutexProfiler() and RegisterMutexTracer()
+// into a single interface, since they are only ever called in pairs.
+
+// Register a hook for CondVar tracing.
+//
+// The function pointer registered here will be called here on various CondVar
+// events. The callback is given an opaque handle to the CondVar object and
+// a string identifying the event. This is thread-safe, but only a single
+// tracer can be registered.
+//
+// Events that can be sent are "Wait", "Unwait", "Signal wakeup", and
+// "SignalAll wakeup".
+//
+// This has the same memory ordering concerns as RegisterMutexProfiler() above.
+void RegisterCondVarTracer(void (*fn)(const char *msg, const void *cv));
+
+// Register a hook for symbolizing stack traces in deadlock detector reports.
+//
+// 'pc' is the program counter being symbolized, 'out' is the buffer to write
+// into, and 'out_size' is the size of the buffer. This function can return
+// false if symbolizing failed, or true if a NUL-terminated symbol was written
+// to 'out.'
+//
+// This has the same memory ordering concerns as RegisterMutexProfiler() above.
+//
+// DEPRECATED: The default symbolizer function is absl::Symbolize() and the
+// ability to register a different hook for symbolizing stack traces will be
+// removed on or after 2023-05-01.
+ABSL_DEPRECATED("absl::RegisterSymbolizer() is deprecated and will be removed "
+ "on or after 2023-05-01")
+void RegisterSymbolizer(bool (*fn)(const void *pc, char *out, int out_size));
+
+// EnableMutexInvariantDebugging()
+//
+// Enable or disable global support for Mutex invariant debugging. If enabled,
+// then invariant predicates can be registered per-Mutex for debug checking.
+// See Mutex::EnableInvariantDebugging().
+void EnableMutexInvariantDebugging(bool enabled);
+
+// When in debug mode, and when the feature has been enabled globally, the
+// implementation will keep track of lock ordering and complain (or optionally
+// crash) if a cycle is detected in the acquired-before graph.
+
+// Possible modes of operation for the deadlock detector in debug mode.
+enum class OnDeadlockCycle {
+ kIgnore, // Neither report on nor attempt to track cycles in lock ordering
+ kReport, // Report lock cycles to stderr when detected
+ kAbort, // Report lock cycles to stderr when detected, then abort
+};
+
+// SetMutexDeadlockDetectionMode()
+//
+// Enable or disable global support for detection of potential deadlocks
+// due to Mutex lock ordering inversions. When set to 'kIgnore', tracking of
+// lock ordering is disabled. Otherwise, in debug builds, a lock ordering graph
+// will be maintained internally, and detected cycles will be reported in
+// the manner chosen here.
+void SetMutexDeadlockDetectionMode(OnDeadlockCycle mode);
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+// In some build configurations we pass --detect-odr-violations to the
+// gold linker. This causes it to flag weak symbol overrides as ODR
+// violations. Because ODR only applies to C++ and not C,
+// --detect-odr-violations ignores symbols not mangled with C++ names.
+// By changing our extension points to be extern "C", we dodge this
+// check.
+extern "C" {
+void AbslInternalMutexYield();
+} // extern "C"
+
+#endif // ABSL_SYNCHRONIZATION_MUTEX_H_
diff --git a/third_party/abseil/src/absl/synchronization/mutex_benchmark.cc b/third_party/abseil/src/absl/synchronization/mutex_benchmark.cc
new file mode 100644
index 0000000..933ea14
--- /dev/null
+++ b/third_party/abseil/src/absl/synchronization/mutex_benchmark.cc
@@ -0,0 +1,224 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <cstdint>
+#include <mutex> // NOLINT(build/c++11)
+#include <vector>
+
+#include "absl/base/config.h"
+#include "absl/base/internal/cycleclock.h"
+#include "absl/base/internal/spinlock.h"
+#include "absl/synchronization/blocking_counter.h"
+#include "absl/synchronization/internal/thread_pool.h"
+#include "absl/synchronization/mutex.h"
+#include "benchmark/benchmark.h"
+
+namespace {
+
+void BM_Mutex(benchmark::State& state) {
+ static absl::Mutex* mu = new absl::Mutex;
+ for (auto _ : state) {
+ absl::MutexLock lock(mu);
+ }
+}
+BENCHMARK(BM_Mutex)->UseRealTime()->Threads(1)->ThreadPerCpu();
+
+static void DelayNs(int64_t ns, int* data) {
+ int64_t end = absl::base_internal::CycleClock::Now() +
+ ns * absl::base_internal::CycleClock::Frequency() / 1e9;
+ while (absl::base_internal::CycleClock::Now() < end) {
+ ++(*data);
+ benchmark::DoNotOptimize(*data);
+ }
+}
+
+template <typename MutexType>
+class RaiiLocker {
+ public:
+ explicit RaiiLocker(MutexType* mu) : mu_(mu) { mu_->Lock(); }
+ ~RaiiLocker() { mu_->Unlock(); }
+ private:
+ MutexType* mu_;
+};
+
+template <>
+class RaiiLocker<std::mutex> {
+ public:
+ explicit RaiiLocker(std::mutex* mu) : mu_(mu) { mu_->lock(); }
+ ~RaiiLocker() { mu_->unlock(); }
+ private:
+ std::mutex* mu_;
+};
+
+template <typename MutexType>
+void BM_Contended(benchmark::State& state) {
+ struct Shared {
+ MutexType mu;
+ int data = 0;
+ };
+ static auto* shared = new Shared;
+ int local = 0;
+ for (auto _ : state) {
+ // Here we model both local work outside of the critical section as well as
+ // some work inside of the critical section. The idea is to capture some
+ // more or less realisitic contention levels.
+ // If contention is too low, the benchmark won't measure anything useful.
+ // If contention is unrealistically high, the benchmark will favor
+ // bad mutex implementations that block and otherwise distract threads
+ // from the mutex and shared state for as much as possible.
+ // To achieve this amount of local work is multiplied by number of threads
+ // to keep ratio between local work and critical section approximately
+ // equal regardless of number of threads.
+ DelayNs(100 * state.threads, &local);
+ RaiiLocker<MutexType> locker(&shared->mu);
+ DelayNs(state.range(0), &shared->data);
+ }
+}
+
+BENCHMARK_TEMPLATE(BM_Contended, absl::Mutex)
+ ->UseRealTime()
+ // ThreadPerCpu poorly handles non-power-of-two CPU counts.
+ ->Threads(1)
+ ->Threads(2)
+ ->Threads(4)
+ ->Threads(6)
+ ->Threads(8)
+ ->Threads(12)
+ ->Threads(16)
+ ->Threads(24)
+ ->Threads(32)
+ ->Threads(48)
+ ->Threads(64)
+ ->Threads(96)
+ ->Threads(128)
+ ->Threads(192)
+ ->Threads(256)
+ // Some empirically chosen amounts of work in critical section.
+ // 1 is low contention, 200 is high contention and few values in between.
+ ->Arg(1)
+ ->Arg(20)
+ ->Arg(50)
+ ->Arg(200);
+
+BENCHMARK_TEMPLATE(BM_Contended, absl::base_internal::SpinLock)
+ ->UseRealTime()
+ // ThreadPerCpu poorly handles non-power-of-two CPU counts.
+ ->Threads(1)
+ ->Threads(2)
+ ->Threads(4)
+ ->Threads(6)
+ ->Threads(8)
+ ->Threads(12)
+ ->Threads(16)
+ ->Threads(24)
+ ->Threads(32)
+ ->Threads(48)
+ ->Threads(64)
+ ->Threads(96)
+ ->Threads(128)
+ ->Threads(192)
+ ->Threads(256)
+ // Some empirically chosen amounts of work in critical section.
+ // 1 is low contention, 200 is high contention and few values in between.
+ ->Arg(1)
+ ->Arg(20)
+ ->Arg(50)
+ ->Arg(200);
+
+BENCHMARK_TEMPLATE(BM_Contended, std::mutex)
+ ->UseRealTime()
+ // ThreadPerCpu poorly handles non-power-of-two CPU counts.
+ ->Threads(1)
+ ->Threads(2)
+ ->Threads(4)
+ ->Threads(6)
+ ->Threads(8)
+ ->Threads(12)
+ ->Threads(16)
+ ->Threads(24)
+ ->Threads(32)
+ ->Threads(48)
+ ->Threads(64)
+ ->Threads(96)
+ ->Threads(128)
+ ->Threads(192)
+ ->Threads(256)
+ // Some empirically chosen amounts of work in critical section.
+ // 1 is low contention, 200 is high contention and few values in between.
+ ->Arg(1)
+ ->Arg(20)
+ ->Arg(50)
+ ->Arg(200);
+
+// Measure the overhead of conditions on mutex release (when they must be
+// evaluated). Mutex has (some) support for equivalence classes allowing
+// Conditions with the same function/argument to potentially not be multiply
+// evaluated.
+//
+// num_classes==0 is used for the special case of every waiter being distinct.
+void BM_ConditionWaiters(benchmark::State& state) {
+ int num_classes = state.range(0);
+ int num_waiters = state.range(1);
+
+ struct Helper {
+ static void Waiter(absl::BlockingCounter* init, absl::Mutex* m, int* p) {
+ init->DecrementCount();
+ m->LockWhen(absl::Condition(
+ static_cast<bool (*)(int*)>([](int* v) { return *v == 0; }), p));
+ m->Unlock();
+ }
+ };
+
+ if (num_classes == 0) {
+ // No equivalence classes.
+ num_classes = num_waiters;
+ }
+
+ absl::BlockingCounter init(num_waiters);
+ absl::Mutex mu;
+ std::vector<int> equivalence_classes(num_classes, 1);
+
+ // Must be declared last to be destroyed first.
+ absl::synchronization_internal::ThreadPool pool(num_waiters);
+
+ for (int i = 0; i < num_waiters; i++) {
+ // Mutex considers Conditions with the same function and argument
+ // to be equivalent.
+ pool.Schedule([&, i] {
+ Helper::Waiter(&init, &mu, &equivalence_classes[i % num_classes]);
+ });
+ }
+ init.Wait();
+
+ for (auto _ : state) {
+ mu.Lock();
+ mu.Unlock(); // Each unlock requires Condition evaluation for our waiters.
+ }
+
+ mu.Lock();
+ for (int i = 0; i < num_classes; i++) {
+ equivalence_classes[i] = 0;
+ }
+ mu.Unlock();
+}
+
+// Some configurations have higher thread limits than others.
+#if defined(__linux__) && !defined(ABSL_HAVE_THREAD_SANITIZER)
+constexpr int kMaxConditionWaiters = 8192;
+#else
+constexpr int kMaxConditionWaiters = 1024;
+#endif
+BENCHMARK(BM_ConditionWaiters)->RangePair(0, 2, 1, kMaxConditionWaiters);
+
+} // namespace
diff --git a/third_party/abseil/src/absl/synchronization/mutex_test.cc b/third_party/abseil/src/absl/synchronization/mutex_test.cc
new file mode 100644
index 0000000..058f757
--- /dev/null
+++ b/third_party/abseil/src/absl/synchronization/mutex_test.cc
@@ -0,0 +1,1706 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/synchronization/mutex.h"
+
+#ifdef _WIN32
+#include <windows.h>
+#endif
+
+#include <algorithm>
+#include <atomic>
+#include <cstdlib>
+#include <functional>
+#include <memory>
+#include <random>
+#include <string>
+#include <thread> // NOLINT(build/c++11)
+#include <vector>
+
+#include "gtest/gtest.h"
+#include "absl/base/attributes.h"
+#include "absl/base/config.h"
+#include "absl/base/internal/raw_logging.h"
+#include "absl/base/internal/sysinfo.h"
+#include "absl/memory/memory.h"
+#include "absl/synchronization/internal/thread_pool.h"
+#include "absl/time/clock.h"
+#include "absl/time/time.h"
+
+namespace {
+
+// TODO(dmauro): Replace with a commandline flag.
+static constexpr bool kExtendedTest = false;
+
+std::unique_ptr<absl::synchronization_internal::ThreadPool> CreatePool(
+ int threads) {
+ return absl::make_unique<absl::synchronization_internal::ThreadPool>(threads);
+}
+
+std::unique_ptr<absl::synchronization_internal::ThreadPool>
+CreateDefaultPool() {
+ return CreatePool(kExtendedTest ? 32 : 10);
+}
+
+// Hack to schedule a function to run on a thread pool thread after a
+// duration has elapsed.
+static void ScheduleAfter(absl::synchronization_internal::ThreadPool *tp,
+ absl::Duration after,
+ const std::function<void()> &func) {
+ tp->Schedule([func, after] {
+ absl::SleepFor(after);
+ func();
+ });
+}
+
+struct TestContext {
+ int iterations;
+ int threads;
+ int g0; // global 0
+ int g1; // global 1
+ absl::Mutex mu;
+ absl::CondVar cv;
+};
+
+// To test whether the invariant check call occurs
+static std::atomic<bool> invariant_checked;
+
+static bool GetInvariantChecked() {
+ return invariant_checked.load(std::memory_order_relaxed);
+}
+
+static void SetInvariantChecked(bool new_value) {
+ invariant_checked.store(new_value, std::memory_order_relaxed);
+}
+
+static void CheckSumG0G1(void *v) {
+ TestContext *cxt = static_cast<TestContext *>(v);
+ ABSL_RAW_CHECK(cxt->g0 == -cxt->g1, "Error in CheckSumG0G1");
+ SetInvariantChecked(true);
+}
+
+static void TestMu(TestContext *cxt, int c) {
+ for (int i = 0; i != cxt->iterations; i++) {
+ absl::MutexLock l(&cxt->mu);
+ int a = cxt->g0 + 1;
+ cxt->g0 = a;
+ cxt->g1--;
+ }
+}
+
+static void TestTry(TestContext *cxt, int c) {
+ for (int i = 0; i != cxt->iterations; i++) {
+ do {
+ std::this_thread::yield();
+ } while (!cxt->mu.TryLock());
+ int a = cxt->g0 + 1;
+ cxt->g0 = a;
+ cxt->g1--;
+ cxt->mu.Unlock();
+ }
+}
+
+static void TestR20ms(TestContext *cxt, int c) {
+ for (int i = 0; i != cxt->iterations; i++) {
+ absl::ReaderMutexLock l(&cxt->mu);
+ absl::SleepFor(absl::Milliseconds(20));
+ cxt->mu.AssertReaderHeld();
+ }
+}
+
+static void TestRW(TestContext *cxt, int c) {
+ if ((c & 1) == 0) {
+ for (int i = 0; i != cxt->iterations; i++) {
+ absl::WriterMutexLock l(&cxt->mu);
+ cxt->g0++;
+ cxt->g1--;
+ cxt->mu.AssertHeld();
+ cxt->mu.AssertReaderHeld();
+ }
+ } else {
+ for (int i = 0; i != cxt->iterations; i++) {
+ absl::ReaderMutexLock l(&cxt->mu);
+ ABSL_RAW_CHECK(cxt->g0 == -cxt->g1, "Error in TestRW");
+ cxt->mu.AssertReaderHeld();
+ }
+ }
+}
+
+struct MyContext {
+ int target;
+ TestContext *cxt;
+ bool MyTurn();
+};
+
+bool MyContext::MyTurn() {
+ TestContext *cxt = this->cxt;
+ return cxt->g0 == this->target || cxt->g0 == cxt->iterations;
+}
+
+static void TestAwait(TestContext *cxt, int c) {
+ MyContext mc;
+ mc.target = c;
+ mc.cxt = cxt;
+ absl::MutexLock l(&cxt->mu);
+ cxt->mu.AssertHeld();
+ while (cxt->g0 < cxt->iterations) {
+ cxt->mu.Await(absl::Condition(&mc, &MyContext::MyTurn));
+ ABSL_RAW_CHECK(mc.MyTurn(), "Error in TestAwait");
+ cxt->mu.AssertHeld();
+ if (cxt->g0 < cxt->iterations) {
+ int a = cxt->g0 + 1;
+ cxt->g0 = a;
+ mc.target += cxt->threads;
+ }
+ }
+}
+
+static void TestSignalAll(TestContext *cxt, int c) {
+ int target = c;
+ absl::MutexLock l(&cxt->mu);
+ cxt->mu.AssertHeld();
+ while (cxt->g0 < cxt->iterations) {
+ while (cxt->g0 != target && cxt->g0 != cxt->iterations) {
+ cxt->cv.Wait(&cxt->mu);
+ }
+ if (cxt->g0 < cxt->iterations) {
+ int a = cxt->g0 + 1;
+ cxt->g0 = a;
+ cxt->cv.SignalAll();
+ target += cxt->threads;
+ }
+ }
+}
+
+static void TestSignal(TestContext *cxt, int c) {
+ ABSL_RAW_CHECK(cxt->threads == 2, "TestSignal should use 2 threads");
+ int target = c;
+ absl::MutexLock l(&cxt->mu);
+ cxt->mu.AssertHeld();
+ while (cxt->g0 < cxt->iterations) {
+ while (cxt->g0 != target && cxt->g0 != cxt->iterations) {
+ cxt->cv.Wait(&cxt->mu);
+ }
+ if (cxt->g0 < cxt->iterations) {
+ int a = cxt->g0 + 1;
+ cxt->g0 = a;
+ cxt->cv.Signal();
+ target += cxt->threads;
+ }
+ }
+}
+
+static void TestCVTimeout(TestContext *cxt, int c) {
+ int target = c;
+ absl::MutexLock l(&cxt->mu);
+ cxt->mu.AssertHeld();
+ while (cxt->g0 < cxt->iterations) {
+ while (cxt->g0 != target && cxt->g0 != cxt->iterations) {
+ cxt->cv.WaitWithTimeout(&cxt->mu, absl::Seconds(100));
+ }
+ if (cxt->g0 < cxt->iterations) {
+ int a = cxt->g0 + 1;
+ cxt->g0 = a;
+ cxt->cv.SignalAll();
+ target += cxt->threads;
+ }
+ }
+}
+
+static bool G0GE2(TestContext *cxt) { return cxt->g0 >= 2; }
+
+static void TestTime(TestContext *cxt, int c, bool use_cv) {
+ ABSL_RAW_CHECK(cxt->iterations == 1, "TestTime should only use 1 iteration");
+ ABSL_RAW_CHECK(cxt->threads > 2, "TestTime should use more than 2 threads");
+ const bool kFalse = false;
+ absl::Condition false_cond(&kFalse);
+ absl::Condition g0ge2(G0GE2, cxt);
+ if (c == 0) {
+ absl::MutexLock l(&cxt->mu);
+
+ absl::Time start = absl::Now();
+ if (use_cv) {
+ cxt->cv.WaitWithTimeout(&cxt->mu, absl::Seconds(1));
+ } else {
+ ABSL_RAW_CHECK(!cxt->mu.AwaitWithTimeout(false_cond, absl::Seconds(1)),
+ "TestTime failed");
+ }
+ absl::Duration elapsed = absl::Now() - start;
+ ABSL_RAW_CHECK(
+ absl::Seconds(0.9) <= elapsed && elapsed <= absl::Seconds(2.0),
+ "TestTime failed");
+ ABSL_RAW_CHECK(cxt->g0 == 1, "TestTime failed");
+
+ start = absl::Now();
+ if (use_cv) {
+ cxt->cv.WaitWithTimeout(&cxt->mu, absl::Seconds(1));
+ } else {
+ ABSL_RAW_CHECK(!cxt->mu.AwaitWithTimeout(false_cond, absl::Seconds(1)),
+ "TestTime failed");
+ }
+ elapsed = absl::Now() - start;
+ ABSL_RAW_CHECK(
+ absl::Seconds(0.9) <= elapsed && elapsed <= absl::Seconds(2.0),
+ "TestTime failed");
+ cxt->g0++;
+ if (use_cv) {
+ cxt->cv.Signal();
+ }
+
+ start = absl::Now();
+ if (use_cv) {
+ cxt->cv.WaitWithTimeout(&cxt->mu, absl::Seconds(4));
+ } else {
+ ABSL_RAW_CHECK(!cxt->mu.AwaitWithTimeout(false_cond, absl::Seconds(4)),
+ "TestTime failed");
+ }
+ elapsed = absl::Now() - start;
+ ABSL_RAW_CHECK(
+ absl::Seconds(3.9) <= elapsed && elapsed <= absl::Seconds(6.0),
+ "TestTime failed");
+ ABSL_RAW_CHECK(cxt->g0 >= 3, "TestTime failed");
+
+ start = absl::Now();
+ if (use_cv) {
+ cxt->cv.WaitWithTimeout(&cxt->mu, absl::Seconds(1));
+ } else {
+ ABSL_RAW_CHECK(!cxt->mu.AwaitWithTimeout(false_cond, absl::Seconds(1)),
+ "TestTime failed");
+ }
+ elapsed = absl::Now() - start;
+ ABSL_RAW_CHECK(
+ absl::Seconds(0.9) <= elapsed && elapsed <= absl::Seconds(2.0),
+ "TestTime failed");
+ if (use_cv) {
+ cxt->cv.SignalAll();
+ }
+
+ start = absl::Now();
+ if (use_cv) {
+ cxt->cv.WaitWithTimeout(&cxt->mu, absl::Seconds(1));
+ } else {
+ ABSL_RAW_CHECK(!cxt->mu.AwaitWithTimeout(false_cond, absl::Seconds(1)),
+ "TestTime failed");
+ }
+ elapsed = absl::Now() - start;
+ ABSL_RAW_CHECK(absl::Seconds(0.9) <= elapsed &&
+ elapsed <= absl::Seconds(2.0), "TestTime failed");
+ ABSL_RAW_CHECK(cxt->g0 == cxt->threads, "TestTime failed");
+
+ } else if (c == 1) {
+ absl::MutexLock l(&cxt->mu);
+ const absl::Time start = absl::Now();
+ if (use_cv) {
+ cxt->cv.WaitWithTimeout(&cxt->mu, absl::Milliseconds(500));
+ } else {
+ ABSL_RAW_CHECK(
+ !cxt->mu.AwaitWithTimeout(false_cond, absl::Milliseconds(500)),
+ "TestTime failed");
+ }
+ const absl::Duration elapsed = absl::Now() - start;
+ ABSL_RAW_CHECK(
+ absl::Seconds(0.4) <= elapsed && elapsed <= absl::Seconds(0.9),
+ "TestTime failed");
+ cxt->g0++;
+ } else if (c == 2) {
+ absl::MutexLock l(&cxt->mu);
+ if (use_cv) {
+ while (cxt->g0 < 2) {
+ cxt->cv.WaitWithTimeout(&cxt->mu, absl::Seconds(100));
+ }
+ } else {
+ ABSL_RAW_CHECK(cxt->mu.AwaitWithTimeout(g0ge2, absl::Seconds(100)),
+ "TestTime failed");
+ }
+ cxt->g0++;
+ } else {
+ absl::MutexLock l(&cxt->mu);
+ if (use_cv) {
+ while (cxt->g0 < 2) {
+ cxt->cv.Wait(&cxt->mu);
+ }
+ } else {
+ cxt->mu.Await(g0ge2);
+ }
+ cxt->g0++;
+ }
+}
+
+static void TestMuTime(TestContext *cxt, int c) { TestTime(cxt, c, false); }
+
+static void TestCVTime(TestContext *cxt, int c) { TestTime(cxt, c, true); }
+
+static void EndTest(int *c0, int *c1, absl::Mutex *mu, absl::CondVar *cv,
+ const std::function<void(int)>& cb) {
+ mu->Lock();
+ int c = (*c0)++;
+ mu->Unlock();
+ cb(c);
+ absl::MutexLock l(mu);
+ (*c1)++;
+ cv->Signal();
+}
+
+// Code common to RunTest() and RunTestWithInvariantDebugging().
+static int RunTestCommon(TestContext *cxt, void (*test)(TestContext *cxt, int),
+ int threads, int iterations, int operations) {
+ absl::Mutex mu2;
+ absl::CondVar cv2;
+ int c0 = 0;
+ int c1 = 0;
+ cxt->g0 = 0;
+ cxt->g1 = 0;
+ cxt->iterations = iterations;
+ cxt->threads = threads;
+ absl::synchronization_internal::ThreadPool tp(threads);
+ for (int i = 0; i != threads; i++) {
+ tp.Schedule(std::bind(&EndTest, &c0, &c1, &mu2, &cv2,
+ std::function<void(int)>(
+ std::bind(test, cxt, std::placeholders::_1))));
+ }
+ mu2.Lock();
+ while (c1 != threads) {
+ cv2.Wait(&mu2);
+ }
+ mu2.Unlock();
+ return cxt->g0;
+}
+
+// Basis for the parameterized tests configured below.
+static int RunTest(void (*test)(TestContext *cxt, int), int threads,
+ int iterations, int operations) {
+ TestContext cxt;
+ return RunTestCommon(&cxt, test, threads, iterations, operations);
+}
+
+// Like RunTest(), but sets an invariant on the tested Mutex and
+// verifies that the invariant check happened. The invariant function
+// will be passed the TestContext* as its arg and must call
+// SetInvariantChecked(true);
+#if !defined(ABSL_MUTEX_ENABLE_INVARIANT_DEBUGGING_NOT_IMPLEMENTED)
+static int RunTestWithInvariantDebugging(void (*test)(TestContext *cxt, int),
+ int threads, int iterations,
+ int operations,
+ void (*invariant)(void *)) {
+ absl::EnableMutexInvariantDebugging(true);
+ SetInvariantChecked(false);
+ TestContext cxt;
+ cxt.mu.EnableInvariantDebugging(invariant, &cxt);
+ int ret = RunTestCommon(&cxt, test, threads, iterations, operations);
+ ABSL_RAW_CHECK(GetInvariantChecked(), "Invariant not checked");
+ absl::EnableMutexInvariantDebugging(false); // Restore.
+ return ret;
+}
+#endif
+
+// --------------------------------------------------------
+// Test for fix of bug in TryRemove()
+struct TimeoutBugStruct {
+ absl::Mutex mu;
+ bool a;
+ int a_waiter_count;
+};
+
+static void WaitForA(TimeoutBugStruct *x) {
+ x->mu.LockWhen(absl::Condition(&x->a));
+ x->a_waiter_count--;
+ x->mu.Unlock();
+}
+
+static bool NoAWaiters(TimeoutBugStruct *x) { return x->a_waiter_count == 0; }
+
+// Test that a CondVar.Wait(&mutex) can un-block a call to mutex.Await() in
+// another thread.
+TEST(Mutex, CondVarWaitSignalsAwait) {
+ // Use a struct so the lock annotations apply.
+ struct {
+ absl::Mutex barrier_mu;
+ bool barrier ABSL_GUARDED_BY(barrier_mu) = false;
+
+ absl::Mutex release_mu;
+ bool release ABSL_GUARDED_BY(release_mu) = false;
+ absl::CondVar released_cv;
+ } state;
+
+ auto pool = CreateDefaultPool();
+
+ // Thread A. Sets barrier, waits for release using Mutex::Await, then
+ // signals released_cv.
+ pool->Schedule([&state] {
+ state.release_mu.Lock();
+
+ state.barrier_mu.Lock();
+ state.barrier = true;
+ state.barrier_mu.Unlock();
+
+ state.release_mu.Await(absl::Condition(&state.release));
+ state.released_cv.Signal();
+ state.release_mu.Unlock();
+ });
+
+ state.barrier_mu.LockWhen(absl::Condition(&state.barrier));
+ state.barrier_mu.Unlock();
+ state.release_mu.Lock();
+ // Thread A is now blocked on release by way of Mutex::Await().
+
+ // Set release. Calling released_cv.Wait() should un-block thread A,
+ // which will signal released_cv. If not, the test will hang.
+ state.release = true;
+ state.released_cv.Wait(&state.release_mu);
+ state.release_mu.Unlock();
+}
+
+// Test that a CondVar.WaitWithTimeout(&mutex) can un-block a call to
+// mutex.Await() in another thread.
+TEST(Mutex, CondVarWaitWithTimeoutSignalsAwait) {
+ // Use a struct so the lock annotations apply.
+ struct {
+ absl::Mutex barrier_mu;
+ bool barrier ABSL_GUARDED_BY(barrier_mu) = false;
+
+ absl::Mutex release_mu;
+ bool release ABSL_GUARDED_BY(release_mu) = false;
+ absl::CondVar released_cv;
+ } state;
+
+ auto pool = CreateDefaultPool();
+
+ // Thread A. Sets barrier, waits for release using Mutex::Await, then
+ // signals released_cv.
+ pool->Schedule([&state] {
+ state.release_mu.Lock();
+
+ state.barrier_mu.Lock();
+ state.barrier = true;
+ state.barrier_mu.Unlock();
+
+ state.release_mu.Await(absl::Condition(&state.release));
+ state.released_cv.Signal();
+ state.release_mu.Unlock();
+ });
+
+ state.barrier_mu.LockWhen(absl::Condition(&state.barrier));
+ state.barrier_mu.Unlock();
+ state.release_mu.Lock();
+ // Thread A is now blocked on release by way of Mutex::Await().
+
+ // Set release. Calling released_cv.Wait() should un-block thread A,
+ // which will signal released_cv. If not, the test will hang.
+ state.release = true;
+ EXPECT_TRUE(
+ !state.released_cv.WaitWithTimeout(&state.release_mu, absl::Seconds(10)))
+ << "; Unrecoverable test failure: CondVar::WaitWithTimeout did not "
+ "unblock the absl::Mutex::Await call in another thread.";
+
+ state.release_mu.Unlock();
+}
+
+// Test for regression of a bug in loop of TryRemove()
+TEST(Mutex, MutexTimeoutBug) {
+ auto tp = CreateDefaultPool();
+
+ TimeoutBugStruct x;
+ x.a = false;
+ x.a_waiter_count = 2;
+ tp->Schedule(std::bind(&WaitForA, &x));
+ tp->Schedule(std::bind(&WaitForA, &x));
+ absl::SleepFor(absl::Seconds(1)); // Allow first two threads to hang.
+ // The skip field of the second will point to the first because there are
+ // only two.
+
+ // Now cause a thread waiting on an always-false to time out
+ // This would deadlock when the bug was present.
+ bool always_false = false;
+ x.mu.LockWhenWithTimeout(absl::Condition(&always_false),
+ absl::Milliseconds(500));
+
+ // if we get here, the bug is not present. Cleanup the state.
+
+ x.a = true; // wakeup the two waiters on A
+ x.mu.Await(absl::Condition(&NoAWaiters, &x)); // wait for them to exit
+ x.mu.Unlock();
+}
+
+struct CondVarWaitDeadlock : testing::TestWithParam<int> {
+ absl::Mutex mu;
+ absl::CondVar cv;
+ bool cond1 = false;
+ bool cond2 = false;
+ bool read_lock1;
+ bool read_lock2;
+ bool signal_unlocked;
+
+ CondVarWaitDeadlock() {
+ read_lock1 = GetParam() & (1 << 0);
+ read_lock2 = GetParam() & (1 << 1);
+ signal_unlocked = GetParam() & (1 << 2);
+ }
+
+ void Waiter1() {
+ if (read_lock1) {
+ mu.ReaderLock();
+ while (!cond1) {
+ cv.Wait(&mu);
+ }
+ mu.ReaderUnlock();
+ } else {
+ mu.Lock();
+ while (!cond1) {
+ cv.Wait(&mu);
+ }
+ mu.Unlock();
+ }
+ }
+
+ void Waiter2() {
+ if (read_lock2) {
+ mu.ReaderLockWhen(absl::Condition(&cond2));
+ mu.ReaderUnlock();
+ } else {
+ mu.LockWhen(absl::Condition(&cond2));
+ mu.Unlock();
+ }
+ }
+};
+
+// Test for a deadlock bug in Mutex::Fer().
+// The sequence of events that lead to the deadlock is:
+// 1. waiter1 blocks on cv in read mode (mu bits = 0).
+// 2. waiter2 blocks on mu in either mode (mu bits = kMuWait).
+// 3. main thread locks mu, sets cond1, unlocks mu (mu bits = kMuWait).
+// 4. main thread signals on cv and this eventually calls Mutex::Fer().
+// Currently Fer wakes waiter1 since mu bits = kMuWait (mutex is unlocked).
+// Before the bug fix Fer neither woke waiter1 nor queued it on mutex,
+// which resulted in deadlock.
+TEST_P(CondVarWaitDeadlock, Test) {
+ auto waiter1 = CreatePool(1);
+ auto waiter2 = CreatePool(1);
+ waiter1->Schedule([this] { this->Waiter1(); });
+ waiter2->Schedule([this] { this->Waiter2(); });
+
+ // Wait while threads block (best-effort is fine).
+ absl::SleepFor(absl::Milliseconds(100));
+
+ // Wake condwaiter.
+ mu.Lock();
+ cond1 = true;
+ if (signal_unlocked) {
+ mu.Unlock();
+ cv.Signal();
+ } else {
+ cv.Signal();
+ mu.Unlock();
+ }
+ waiter1.reset(); // "join" waiter1
+
+ // Wake waiter.
+ mu.Lock();
+ cond2 = true;
+ mu.Unlock();
+ waiter2.reset(); // "join" waiter2
+}
+
+INSTANTIATE_TEST_SUITE_P(CondVarWaitDeadlockTest, CondVarWaitDeadlock,
+ ::testing::Range(0, 8),
+ ::testing::PrintToStringParamName());
+
+// --------------------------------------------------------
+// Test for fix of bug in DequeueAllWakeable()
+// Bug was that if there was more than one waiting reader
+// and all should be woken, the most recently blocked one
+// would not be.
+
+struct DequeueAllWakeableBugStruct {
+ absl::Mutex mu;
+ absl::Mutex mu2; // protects all fields below
+ int unfinished_count; // count of unfinished readers; under mu2
+ bool done1; // unfinished_count == 0; under mu2
+ int finished_count; // count of finished readers, under mu2
+ bool done2; // finished_count == 0; under mu2
+};
+
+// Test for regression of a bug in loop of DequeueAllWakeable()
+static void AcquireAsReader(DequeueAllWakeableBugStruct *x) {
+ x->mu.ReaderLock();
+ x->mu2.Lock();
+ x->unfinished_count--;
+ x->done1 = (x->unfinished_count == 0);
+ x->mu2.Unlock();
+ // make sure that both readers acquired mu before we release it.
+ absl::SleepFor(absl::Seconds(2));
+ x->mu.ReaderUnlock();
+
+ x->mu2.Lock();
+ x->finished_count--;
+ x->done2 = (x->finished_count == 0);
+ x->mu2.Unlock();
+}
+
+// Test for regression of a bug in loop of DequeueAllWakeable()
+TEST(Mutex, MutexReaderWakeupBug) {
+ auto tp = CreateDefaultPool();
+
+ DequeueAllWakeableBugStruct x;
+ x.unfinished_count = 2;
+ x.done1 = false;
+ x.finished_count = 2;
+ x.done2 = false;
+ x.mu.Lock(); // acquire mu exclusively
+ // queue two thread that will block on reader locks on x.mu
+ tp->Schedule(std::bind(&AcquireAsReader, &x));
+ tp->Schedule(std::bind(&AcquireAsReader, &x));
+ absl::SleepFor(absl::Seconds(1)); // give time for reader threads to block
+ x.mu.Unlock(); // wake them up
+
+ // both readers should finish promptly
+ EXPECT_TRUE(
+ x.mu2.LockWhenWithTimeout(absl::Condition(&x.done1), absl::Seconds(10)));
+ x.mu2.Unlock();
+
+ EXPECT_TRUE(
+ x.mu2.LockWhenWithTimeout(absl::Condition(&x.done2), absl::Seconds(10)));
+ x.mu2.Unlock();
+}
+
+struct LockWhenTestStruct {
+ absl::Mutex mu1;
+ bool cond = false;
+
+ absl::Mutex mu2;
+ bool waiting = false;
+};
+
+static bool LockWhenTestIsCond(LockWhenTestStruct* s) {
+ s->mu2.Lock();
+ s->waiting = true;
+ s->mu2.Unlock();
+ return s->cond;
+}
+
+static void LockWhenTestWaitForIsCond(LockWhenTestStruct* s) {
+ s->mu1.LockWhen(absl::Condition(&LockWhenTestIsCond, s));
+ s->mu1.Unlock();
+}
+
+TEST(Mutex, LockWhen) {
+ LockWhenTestStruct s;
+
+ std::thread t(LockWhenTestWaitForIsCond, &s);
+ s.mu2.LockWhen(absl::Condition(&s.waiting));
+ s.mu2.Unlock();
+
+ s.mu1.Lock();
+ s.cond = true;
+ s.mu1.Unlock();
+
+ t.join();
+}
+
+TEST(Mutex, LockWhenGuard) {
+ absl::Mutex mu;
+ int n = 30;
+ bool done = false;
+
+ // We don't inline the lambda because the conversion is ambiguous in MSVC.
+ bool (*cond_eq_10)(int *) = [](int *p) { return *p == 10; };
+ bool (*cond_lt_10)(int *) = [](int *p) { return *p < 10; };
+
+ std::thread t1([&mu, &n, &done, cond_eq_10]() {
+ absl::ReaderMutexLock lock(&mu, absl::Condition(cond_eq_10, &n));
+ done = true;
+ });
+
+ std::thread t2[10];
+ for (std::thread &t : t2) {
+ t = std::thread([&mu, &n, cond_lt_10]() {
+ absl::WriterMutexLock lock(&mu, absl::Condition(cond_lt_10, &n));
+ ++n;
+ });
+ }
+
+ {
+ absl::MutexLock lock(&mu);
+ n = 0;
+ }
+
+ for (std::thread &t : t2) t.join();
+ t1.join();
+
+ EXPECT_TRUE(done);
+ EXPECT_EQ(n, 10);
+}
+
+// --------------------------------------------------------
+// The following test requires Mutex::ReaderLock to be a real shared
+// lock, which is not the case in all builds.
+#if !defined(ABSL_MUTEX_READER_LOCK_IS_EXCLUSIVE)
+
+// Test for fix of bug in UnlockSlow() that incorrectly decremented the reader
+// count when putting a thread to sleep waiting for a false condition when the
+// lock was not held.
+
+// For this bug to strike, we make a thread wait on a free mutex with no
+// waiters by causing its wakeup condition to be false. Then the
+// next two acquirers must be readers. The bug causes the lock
+// to be released when one reader unlocks, rather than both.
+
+struct ReaderDecrementBugStruct {
+ bool cond; // to delay first thread (under mu)
+ int done; // reference count (under mu)
+ absl::Mutex mu;
+
+ bool waiting_on_cond; // under mu2
+ bool have_reader_lock; // under mu2
+ bool complete; // under mu2
+ absl::Mutex mu2; // > mu
+};
+
+// L >= mu, L < mu_waiting_on_cond
+static bool IsCond(void *v) {
+ ReaderDecrementBugStruct *x = reinterpret_cast<ReaderDecrementBugStruct *>(v);
+ x->mu2.Lock();
+ x->waiting_on_cond = true;
+ x->mu2.Unlock();
+ return x->cond;
+}
+
+// L >= mu
+static bool AllDone(void *v) {
+ ReaderDecrementBugStruct *x = reinterpret_cast<ReaderDecrementBugStruct *>(v);
+ return x->done == 0;
+}
+
+// L={}
+static void WaitForCond(ReaderDecrementBugStruct *x) {
+ absl::Mutex dummy;
+ absl::MutexLock l(&dummy);
+ x->mu.LockWhen(absl::Condition(&IsCond, x));
+ x->done--;
+ x->mu.Unlock();
+}
+
+// L={}
+static void GetReadLock(ReaderDecrementBugStruct *x) {
+ x->mu.ReaderLock();
+ x->mu2.Lock();
+ x->have_reader_lock = true;
+ x->mu2.Await(absl::Condition(&x->complete));
+ x->mu2.Unlock();
+ x->mu.ReaderUnlock();
+ x->mu.Lock();
+ x->done--;
+ x->mu.Unlock();
+}
+
+// Test for reader counter being decremented incorrectly by waiter
+// with false condition.
+TEST(Mutex, MutexReaderDecrementBug) ABSL_NO_THREAD_SAFETY_ANALYSIS {
+ ReaderDecrementBugStruct x;
+ x.cond = false;
+ x.waiting_on_cond = false;
+ x.have_reader_lock = false;
+ x.complete = false;
+ x.done = 2; // initial ref count
+
+ // Run WaitForCond() and wait for it to sleep
+ std::thread thread1(WaitForCond, &x);
+ x.mu2.LockWhen(absl::Condition(&x.waiting_on_cond));
+ x.mu2.Unlock();
+
+ // Run GetReadLock(), and wait for it to get the read lock
+ std::thread thread2(GetReadLock, &x);
+ x.mu2.LockWhen(absl::Condition(&x.have_reader_lock));
+ x.mu2.Unlock();
+
+ // Get the reader lock ourselves, and release it.
+ x.mu.ReaderLock();
+ x.mu.ReaderUnlock();
+
+ // The lock should be held in read mode by GetReadLock().
+ // If we have the bug, the lock will be free.
+ x.mu.AssertReaderHeld();
+
+ // Wake up all the threads.
+ x.mu2.Lock();
+ x.complete = true;
+ x.mu2.Unlock();
+
+ // TODO(delesley): turn on analysis once lock upgrading is supported.
+ // (This call upgrades the lock from shared to exclusive.)
+ x.mu.Lock();
+ x.cond = true;
+ x.mu.Await(absl::Condition(&AllDone, &x));
+ x.mu.Unlock();
+
+ thread1.join();
+ thread2.join();
+}
+#endif // !ABSL_MUTEX_READER_LOCK_IS_EXCLUSIVE
+
+// Test that we correctly handle the situation when a lock is
+// held and then destroyed (w/o unlocking).
+#ifdef ABSL_HAVE_THREAD_SANITIZER
+// TSAN reports errors when locked Mutexes are destroyed.
+TEST(Mutex, DISABLED_LockedMutexDestructionBug) NO_THREAD_SAFETY_ANALYSIS {
+#else
+TEST(Mutex, LockedMutexDestructionBug) ABSL_NO_THREAD_SAFETY_ANALYSIS {
+#endif
+ for (int i = 0; i != 10; i++) {
+ // Create, lock and destroy 10 locks.
+ const int kNumLocks = 10;
+ auto mu = absl::make_unique<absl::Mutex[]>(kNumLocks);
+ for (int j = 0; j != kNumLocks; j++) {
+ if ((j % 2) == 0) {
+ mu[j].WriterLock();
+ } else {
+ mu[j].ReaderLock();
+ }
+ }
+ }
+}
+
+// --------------------------------------------------------
+// Test for bug with pattern of readers using a condvar. The bug was that if a
+// reader went to sleep on a condition variable while one or more other readers
+// held the lock, but there were no waiters, the reader count (held in the
+// mutex word) would be lost. (This is because Enqueue() had at one time
+// always placed the thread on the Mutex queue. Later (CL 4075610), to
+// tolerate re-entry into Mutex from a Condition predicate, Enqueue() was
+// changed so that it could also place a thread on a condition-variable. This
+// introduced the case where Enqueue() returned with an empty queue, and this
+// case was handled incorrectly in one place.)
+
+static void ReaderForReaderOnCondVar(absl::Mutex *mu, absl::CondVar *cv,
+ int *running) {
+ std::random_device dev;
+ std::mt19937 gen(dev());
+ std::uniform_int_distribution<int> random_millis(0, 15);
+ mu->ReaderLock();
+ while (*running == 3) {
+ absl::SleepFor(absl::Milliseconds(random_millis(gen)));
+ cv->WaitWithTimeout(mu, absl::Milliseconds(random_millis(gen)));
+ }
+ mu->ReaderUnlock();
+ mu->Lock();
+ (*running)--;
+ mu->Unlock();
+}
+
+struct True {
+ template <class... Args>
+ bool operator()(Args...) const {
+ return true;
+ }
+};
+
+struct DerivedTrue : True {};
+
+TEST(Mutex, FunctorCondition) {
+ { // Variadic
+ True f;
+ EXPECT_TRUE(absl::Condition(&f).Eval());
+ }
+
+ { // Inherited
+ DerivedTrue g;
+ EXPECT_TRUE(absl::Condition(&g).Eval());
+ }
+
+ { // lambda
+ int value = 3;
+ auto is_zero = [&value] { return value == 0; };
+ absl::Condition c(&is_zero);
+ EXPECT_FALSE(c.Eval());
+ value = 0;
+ EXPECT_TRUE(c.Eval());
+ }
+
+ { // bind
+ int value = 0;
+ auto is_positive = std::bind(std::less<int>(), 0, std::cref(value));
+ absl::Condition c(&is_positive);
+ EXPECT_FALSE(c.Eval());
+ value = 1;
+ EXPECT_TRUE(c.Eval());
+ }
+
+ { // std::function
+ int value = 3;
+ std::function<bool()> is_zero = [&value] { return value == 0; };
+ absl::Condition c(&is_zero);
+ EXPECT_FALSE(c.Eval());
+ value = 0;
+ EXPECT_TRUE(c.Eval());
+ }
+}
+
+static bool IntIsZero(int *x) { return *x == 0; }
+
+// Test for reader waiting condition variable when there are other readers
+// but no waiters.
+TEST(Mutex, TestReaderOnCondVar) {
+ auto tp = CreateDefaultPool();
+ absl::Mutex mu;
+ absl::CondVar cv;
+ int running = 3;
+ tp->Schedule(std::bind(&ReaderForReaderOnCondVar, &mu, &cv, &running));
+ tp->Schedule(std::bind(&ReaderForReaderOnCondVar, &mu, &cv, &running));
+ absl::SleepFor(absl::Seconds(2));
+ mu.Lock();
+ running--;
+ mu.Await(absl::Condition(&IntIsZero, &running));
+ mu.Unlock();
+}
+
+// --------------------------------------------------------
+struct AcquireFromConditionStruct {
+ absl::Mutex mu0; // protects value, done
+ int value; // times condition function is called; under mu0,
+ bool done; // done with test? under mu0
+ absl::Mutex mu1; // used to attempt to mess up state of mu0
+ absl::CondVar cv; // so the condition function can be invoked from
+ // CondVar::Wait().
+};
+
+static bool ConditionWithAcquire(AcquireFromConditionStruct *x) {
+ x->value++; // count times this function is called
+
+ if (x->value == 2 || x->value == 3) {
+ // On the second and third invocation of this function, sleep for 100ms,
+ // but with the side-effect of altering the state of a Mutex other than
+ // than one for which this is a condition. The spec now explicitly allows
+ // this side effect; previously it did not. it was illegal.
+ bool always_false = false;
+ x->mu1.LockWhenWithTimeout(absl::Condition(&always_false),
+ absl::Milliseconds(100));
+ x->mu1.Unlock();
+ }
+ ABSL_RAW_CHECK(x->value < 4, "should not be invoked a fourth time");
+
+ // We arrange for the condition to return true on only the 2nd and 3rd calls.
+ return x->value == 2 || x->value == 3;
+}
+
+static void WaitForCond2(AcquireFromConditionStruct *x) {
+ // wait for cond0 to become true
+ x->mu0.LockWhen(absl::Condition(&ConditionWithAcquire, x));
+ x->done = true;
+ x->mu0.Unlock();
+}
+
+// Test for Condition whose function acquires other Mutexes
+TEST(Mutex, AcquireFromCondition) {
+ auto tp = CreateDefaultPool();
+
+ AcquireFromConditionStruct x;
+ x.value = 0;
+ x.done = false;
+ tp->Schedule(
+ std::bind(&WaitForCond2, &x)); // run WaitForCond2() in a thread T
+ // T will hang because the first invocation of ConditionWithAcquire() will
+ // return false.
+ absl::SleepFor(absl::Milliseconds(500)); // allow T time to hang
+
+ x.mu0.Lock();
+ x.cv.WaitWithTimeout(&x.mu0, absl::Milliseconds(500)); // wake T
+ // T will be woken because the Wait() will call ConditionWithAcquire()
+ // for the second time, and it will return true.
+
+ x.mu0.Unlock();
+
+ // T will then acquire the lock and recheck its own condition.
+ // It will find the condition true, as this is the third invocation,
+ // but the use of another Mutex by the calling function will
+ // cause the old mutex implementation to think that the outer
+ // LockWhen() has timed out because the inner LockWhenWithTimeout() did.
+ // T will then check the condition a fourth time because it finds a
+ // timeout occurred. This should not happen in the new
+ // implementation that allows the Condition function to use Mutexes.
+
+ // It should also succeed, even though the Condition function
+ // is being invoked from CondVar::Wait, and thus this thread
+ // is conceptually waiting both on the condition variable, and on mu2.
+
+ x.mu0.LockWhen(absl::Condition(&x.done));
+ x.mu0.Unlock();
+}
+
+TEST(Mutex, DeadlockDetector) {
+ absl::SetMutexDeadlockDetectionMode(absl::OnDeadlockCycle::kAbort);
+
+ // check that we can call ForgetDeadlockInfo() on a lock with the lock held
+ absl::Mutex m1;
+ absl::Mutex m2;
+ absl::Mutex m3;
+ absl::Mutex m4;
+
+ m1.Lock(); // m1 gets ID1
+ m2.Lock(); // m2 gets ID2
+ m3.Lock(); // m3 gets ID3
+ m3.Unlock();
+ m2.Unlock();
+ // m1 still held
+ m1.ForgetDeadlockInfo(); // m1 loses ID
+ m2.Lock(); // m2 gets ID2
+ m3.Lock(); // m3 gets ID3
+ m4.Lock(); // m4 gets ID4
+ m3.Unlock();
+ m2.Unlock();
+ m4.Unlock();
+ m1.Unlock();
+}
+
+// Bazel has a test "warning" file that programs can write to if the
+// test should pass with a warning. This class disables the warning
+// file until it goes out of scope.
+class ScopedDisableBazelTestWarnings {
+ public:
+ ScopedDisableBazelTestWarnings() {
+#ifdef _WIN32
+ char file[MAX_PATH];
+ if (GetEnvironmentVariableA(kVarName, file, sizeof(file)) < sizeof(file)) {
+ warnings_output_file_ = file;
+ SetEnvironmentVariableA(kVarName, nullptr);
+ }
+#else
+ const char *file = getenv(kVarName);
+ if (file != nullptr) {
+ warnings_output_file_ = file;
+ unsetenv(kVarName);
+ }
+#endif
+ }
+
+ ~ScopedDisableBazelTestWarnings() {
+ if (!warnings_output_file_.empty()) {
+#ifdef _WIN32
+ SetEnvironmentVariableA(kVarName, warnings_output_file_.c_str());
+#else
+ setenv(kVarName, warnings_output_file_.c_str(), 0);
+#endif
+ }
+ }
+
+ private:
+ static const char kVarName[];
+ std::string warnings_output_file_;
+};
+const char ScopedDisableBazelTestWarnings::kVarName[] =
+ "TEST_WARNINGS_OUTPUT_FILE";
+
+#ifdef ABSL_HAVE_THREAD_SANITIZER
+// This test intentionally creates deadlocks to test the deadlock detector.
+TEST(Mutex, DISABLED_DeadlockDetectorBazelWarning) {
+#else
+TEST(Mutex, DeadlockDetectorBazelWarning) {
+#endif
+ absl::SetMutexDeadlockDetectionMode(absl::OnDeadlockCycle::kReport);
+
+ // Cause deadlock detection to detect something, if it's
+ // compiled in and enabled. But turn off the bazel warning.
+ ScopedDisableBazelTestWarnings disable_bazel_test_warnings;
+
+ absl::Mutex mu0;
+ absl::Mutex mu1;
+ bool got_mu0 = mu0.TryLock();
+ mu1.Lock(); // acquire mu1 while holding mu0
+ if (got_mu0) {
+ mu0.Unlock();
+ }
+ if (mu0.TryLock()) { // try lock shouldn't cause deadlock detector to fire
+ mu0.Unlock();
+ }
+ mu0.Lock(); // acquire mu0 while holding mu1; should get one deadlock
+ // report here
+ mu0.Unlock();
+ mu1.Unlock();
+
+ absl::SetMutexDeadlockDetectionMode(absl::OnDeadlockCycle::kAbort);
+}
+
+// This test is tagged with NO_THREAD_SAFETY_ANALYSIS because the
+// annotation-based static thread-safety analysis is not currently
+// predicate-aware and cannot tell if the two for-loops that acquire and
+// release the locks have the same predicates.
+TEST(Mutex, DeadlockDetectorStressTest) ABSL_NO_THREAD_SAFETY_ANALYSIS {
+ // Stress test: Here we create a large number of locks and use all of them.
+ // If a deadlock detector keeps a full graph of lock acquisition order,
+ // it will likely be too slow for this test to pass.
+ const int n_locks = 1 << 17;
+ auto array_of_locks = absl::make_unique<absl::Mutex[]>(n_locks);
+ for (int i = 0; i < n_locks; i++) {
+ int end = std::min(n_locks, i + 5);
+ // acquire and then release locks i, i+1, ..., i+4
+ for (int j = i; j < end; j++) {
+ array_of_locks[j].Lock();
+ }
+ for (int j = i; j < end; j++) {
+ array_of_locks[j].Unlock();
+ }
+ }
+}
+
+#ifdef ABSL_HAVE_THREAD_SANITIZER
+// TSAN reports errors when locked Mutexes are destroyed.
+TEST(Mutex, DISABLED_DeadlockIdBug) NO_THREAD_SAFETY_ANALYSIS {
+#else
+TEST(Mutex, DeadlockIdBug) ABSL_NO_THREAD_SAFETY_ANALYSIS {
+#endif
+ // Test a scenario where a cached deadlock graph node id in the
+ // list of held locks is not invalidated when the corresponding
+ // mutex is deleted.
+ absl::SetMutexDeadlockDetectionMode(absl::OnDeadlockCycle::kAbort);
+ // Mutex that will be destroyed while being held
+ absl::Mutex *a = new absl::Mutex;
+ // Other mutexes needed by test
+ absl::Mutex b, c;
+
+ // Hold mutex.
+ a->Lock();
+
+ // Force deadlock id assignment by acquiring another lock.
+ b.Lock();
+ b.Unlock();
+
+ // Delete the mutex. The Mutex destructor tries to remove held locks,
+ // but the attempt isn't foolproof. It can fail if:
+ // (a) Deadlock detection is currently disabled.
+ // (b) The destruction is from another thread.
+ // We exploit (a) by temporarily disabling deadlock detection.
+ absl::SetMutexDeadlockDetectionMode(absl::OnDeadlockCycle::kIgnore);
+ delete a;
+ absl::SetMutexDeadlockDetectionMode(absl::OnDeadlockCycle::kAbort);
+
+ // Now acquire another lock which will force a deadlock id assignment.
+ // We should end up getting assigned the same deadlock id that was
+ // freed up when "a" was deleted, which will cause a spurious deadlock
+ // report if the held lock entry for "a" was not invalidated.
+ c.Lock();
+ c.Unlock();
+}
+
+// --------------------------------------------------------
+// Test for timeouts/deadlines on condition waits that are specified using
+// absl::Duration and absl::Time. For each waiting function we test with
+// a timeout/deadline that has already expired/passed, one that is infinite
+// and so never expires/passes, and one that will expire/pass in the near
+// future.
+
+static absl::Duration TimeoutTestAllowedSchedulingDelay() {
+ // Note: we use a function here because Microsoft Visual Studio fails to
+ // properly initialize constexpr static absl::Duration variables.
+ return absl::Milliseconds(150);
+}
+
+// Returns true if `actual_delay` is close enough to `expected_delay` to pass
+// the timeouts/deadlines test. Otherwise, logs warnings and returns false.
+ABSL_MUST_USE_RESULT
+static bool DelayIsWithinBounds(absl::Duration expected_delay,
+ absl::Duration actual_delay) {
+ bool pass = true;
+ // Do not allow the observed delay to be less than expected. This may occur
+ // in practice due to clock skew or when the synchronization primitives use a
+ // different clock than absl::Now(), but these cases should be handled by the
+ // the retry mechanism in each TimeoutTest.
+ if (actual_delay < expected_delay) {
+ ABSL_RAW_LOG(WARNING,
+ "Actual delay %s was too short, expected %s (difference %s)",
+ absl::FormatDuration(actual_delay).c_str(),
+ absl::FormatDuration(expected_delay).c_str(),
+ absl::FormatDuration(actual_delay - expected_delay).c_str());
+ pass = false;
+ }
+ // If the expected delay is <= zero then allow a small error tolerance, since
+ // we do not expect context switches to occur during test execution.
+ // Otherwise, thread scheduling delays may be substantial in rare cases, so
+ // tolerate up to kTimeoutTestAllowedSchedulingDelay of error.
+ absl::Duration tolerance = expected_delay <= absl::ZeroDuration()
+ ? absl::Milliseconds(10)
+ : TimeoutTestAllowedSchedulingDelay();
+ if (actual_delay > expected_delay + tolerance) {
+ ABSL_RAW_LOG(WARNING,
+ "Actual delay %s was too long, expected %s (difference %s)",
+ absl::FormatDuration(actual_delay).c_str(),
+ absl::FormatDuration(expected_delay).c_str(),
+ absl::FormatDuration(actual_delay - expected_delay).c_str());
+ pass = false;
+ }
+ return pass;
+}
+
+// Parameters for TimeoutTest, below.
+struct TimeoutTestParam {
+ // The file and line number (used for logging purposes only).
+ const char *from_file;
+ int from_line;
+
+ // Should the absolute deadline API based on absl::Time be tested? If false,
+ // the relative deadline API based on absl::Duration is tested.
+ bool use_absolute_deadline;
+
+ // The deadline/timeout used when calling the API being tested
+ // (e.g. Mutex::LockWhenWithDeadline).
+ absl::Duration wait_timeout;
+
+ // The delay before the condition will be set true by the test code. If zero
+ // or negative, the condition is set true immediately (before calling the API
+ // being tested). Otherwise, if infinite, the condition is never set true.
+ // Otherwise a closure is scheduled for the future that sets the condition
+ // true.
+ absl::Duration satisfy_condition_delay;
+
+ // The expected result of the condition after the call to the API being
+ // tested. Generally `true` means the condition was true when the API returns,
+ // `false` indicates an expected timeout.
+ bool expected_result;
+
+ // The expected delay before the API under test returns. This is inherently
+ // flaky, so some slop is allowed (see `DelayIsWithinBounds` above), and the
+ // test keeps trying indefinitely until this constraint passes.
+ absl::Duration expected_delay;
+};
+
+// Print a `TimeoutTestParam` to a debug log.
+std::ostream &operator<<(std::ostream &os, const TimeoutTestParam ¶m) {
+ return os << "from: " << param.from_file << ":" << param.from_line
+ << " use_absolute_deadline: "
+ << (param.use_absolute_deadline ? "true" : "false")
+ << " wait_timeout: " << param.wait_timeout
+ << " satisfy_condition_delay: " << param.satisfy_condition_delay
+ << " expected_result: "
+ << (param.expected_result ? "true" : "false")
+ << " expected_delay: " << param.expected_delay;
+}
+
+std::string FormatString(const TimeoutTestParam ¶m) {
+ std::ostringstream os;
+ os << param;
+ return os.str();
+}
+
+// Like `thread::Executor::ScheduleAt` except:
+// a) Delays zero or negative are executed immediately in the current thread.
+// b) Infinite delays are never scheduled.
+// c) Calls this test's `ScheduleAt` helper instead of using `pool` directly.
+static void RunAfterDelay(absl::Duration delay,
+ absl::synchronization_internal::ThreadPool *pool,
+ const std::function<void()> &callback) {
+ if (delay <= absl::ZeroDuration()) {
+ callback(); // immediate
+ } else if (delay != absl::InfiniteDuration()) {
+ ScheduleAfter(pool, delay, callback);
+ }
+}
+
+class TimeoutTest : public ::testing::Test,
+ public ::testing::WithParamInterface<TimeoutTestParam> {};
+
+std::vector<TimeoutTestParam> MakeTimeoutTestParamValues() {
+ // The `finite` delay is a finite, relatively short, delay. We make it larger
+ // than our allowed scheduling delay (slop factor) to avoid confusion when
+ // diagnosing test failures. The other constants here have clear meanings.
+ const absl::Duration finite = 3 * TimeoutTestAllowedSchedulingDelay();
+ const absl::Duration never = absl::InfiniteDuration();
+ const absl::Duration negative = -absl::InfiniteDuration();
+ const absl::Duration immediate = absl::ZeroDuration();
+
+ // Every test case is run twice; once using the absolute deadline API and once
+ // using the relative timeout API.
+ std::vector<TimeoutTestParam> values;
+ for (bool use_absolute_deadline : {false, true}) {
+ // Tests with a negative timeout (deadline in the past), which should
+ // immediately return current state of the condition.
+
+ // The condition is already true:
+ values.push_back(TimeoutTestParam{
+ __FILE__, __LINE__, use_absolute_deadline,
+ negative, // wait_timeout
+ immediate, // satisfy_condition_delay
+ true, // expected_result
+ immediate, // expected_delay
+ });
+
+ // The condition becomes true, but the timeout has already expired:
+ values.push_back(TimeoutTestParam{
+ __FILE__, __LINE__, use_absolute_deadline,
+ negative, // wait_timeout
+ finite, // satisfy_condition_delay
+ false, // expected_result
+ immediate // expected_delay
+ });
+
+ // The condition never becomes true:
+ values.push_back(TimeoutTestParam{
+ __FILE__, __LINE__, use_absolute_deadline,
+ negative, // wait_timeout
+ never, // satisfy_condition_delay
+ false, // expected_result
+ immediate // expected_delay
+ });
+
+ // Tests with an infinite timeout (deadline in the infinite future), which
+ // should only return when the condition becomes true.
+
+ // The condition is already true:
+ values.push_back(TimeoutTestParam{
+ __FILE__, __LINE__, use_absolute_deadline,
+ never, // wait_timeout
+ immediate, // satisfy_condition_delay
+ true, // expected_result
+ immediate // expected_delay
+ });
+
+ // The condition becomes true before the (infinite) expiry:
+ values.push_back(TimeoutTestParam{
+ __FILE__, __LINE__, use_absolute_deadline,
+ never, // wait_timeout
+ finite, // satisfy_condition_delay
+ true, // expected_result
+ finite, // expected_delay
+ });
+
+ // Tests with a (small) finite timeout (deadline soon), with the condition
+ // becoming true both before and after its expiry.
+
+ // The condition is already true:
+ values.push_back(TimeoutTestParam{
+ __FILE__, __LINE__, use_absolute_deadline,
+ never, // wait_timeout
+ immediate, // satisfy_condition_delay
+ true, // expected_result
+ immediate // expected_delay
+ });
+
+ // The condition becomes true before the expiry:
+ values.push_back(TimeoutTestParam{
+ __FILE__, __LINE__, use_absolute_deadline,
+ finite * 2, // wait_timeout
+ finite, // satisfy_condition_delay
+ true, // expected_result
+ finite // expected_delay
+ });
+
+ // The condition becomes true, but the timeout has already expired:
+ values.push_back(TimeoutTestParam{
+ __FILE__, __LINE__, use_absolute_deadline,
+ finite, // wait_timeout
+ finite * 2, // satisfy_condition_delay
+ false, // expected_result
+ finite // expected_delay
+ });
+
+ // The condition never becomes true:
+ values.push_back(TimeoutTestParam{
+ __FILE__, __LINE__, use_absolute_deadline,
+ finite, // wait_timeout
+ never, // satisfy_condition_delay
+ false, // expected_result
+ finite // expected_delay
+ });
+ }
+ return values;
+}
+
+// Instantiate `TimeoutTest` with `MakeTimeoutTestParamValues()`.
+INSTANTIATE_TEST_SUITE_P(All, TimeoutTest,
+ testing::ValuesIn(MakeTimeoutTestParamValues()));
+
+TEST_P(TimeoutTest, Await) {
+ const TimeoutTestParam params = GetParam();
+ ABSL_RAW_LOG(INFO, "Params: %s", FormatString(params).c_str());
+
+ // Because this test asserts bounds on scheduling delays it is flaky. To
+ // compensate it loops forever until it passes. Failures express as test
+ // timeouts, in which case the test log can be used to diagnose the issue.
+ for (int attempt = 1;; ++attempt) {
+ ABSL_RAW_LOG(INFO, "Attempt %d", attempt);
+
+ absl::Mutex mu;
+ bool value = false; // condition value (under mu)
+
+ std::unique_ptr<absl::synchronization_internal::ThreadPool> pool =
+ CreateDefaultPool();
+ RunAfterDelay(params.satisfy_condition_delay, pool.get(), [&] {
+ absl::MutexLock l(&mu);
+ value = true;
+ });
+
+ absl::MutexLock lock(&mu);
+ absl::Time start_time = absl::Now();
+ absl::Condition cond(&value);
+ bool result =
+ params.use_absolute_deadline
+ ? mu.AwaitWithDeadline(cond, start_time + params.wait_timeout)
+ : mu.AwaitWithTimeout(cond, params.wait_timeout);
+ if (DelayIsWithinBounds(params.expected_delay, absl::Now() - start_time)) {
+ EXPECT_EQ(params.expected_result, result);
+ break;
+ }
+ }
+}
+
+TEST_P(TimeoutTest, LockWhen) {
+ const TimeoutTestParam params = GetParam();
+ ABSL_RAW_LOG(INFO, "Params: %s", FormatString(params).c_str());
+
+ // Because this test asserts bounds on scheduling delays it is flaky. To
+ // compensate it loops forever until it passes. Failures express as test
+ // timeouts, in which case the test log can be used to diagnose the issue.
+ for (int attempt = 1;; ++attempt) {
+ ABSL_RAW_LOG(INFO, "Attempt %d", attempt);
+
+ absl::Mutex mu;
+ bool value = false; // condition value (under mu)
+
+ std::unique_ptr<absl::synchronization_internal::ThreadPool> pool =
+ CreateDefaultPool();
+ RunAfterDelay(params.satisfy_condition_delay, pool.get(), [&] {
+ absl::MutexLock l(&mu);
+ value = true;
+ });
+
+ absl::Time start_time = absl::Now();
+ absl::Condition cond(&value);
+ bool result =
+ params.use_absolute_deadline
+ ? mu.LockWhenWithDeadline(cond, start_time + params.wait_timeout)
+ : mu.LockWhenWithTimeout(cond, params.wait_timeout);
+ mu.Unlock();
+
+ if (DelayIsWithinBounds(params.expected_delay, absl::Now() - start_time)) {
+ EXPECT_EQ(params.expected_result, result);
+ break;
+ }
+ }
+}
+
+TEST_P(TimeoutTest, ReaderLockWhen) {
+ const TimeoutTestParam params = GetParam();
+ ABSL_RAW_LOG(INFO, "Params: %s", FormatString(params).c_str());
+
+ // Because this test asserts bounds on scheduling delays it is flaky. To
+ // compensate it loops forever until it passes. Failures express as test
+ // timeouts, in which case the test log can be used to diagnose the issue.
+ for (int attempt = 0;; ++attempt) {
+ ABSL_RAW_LOG(INFO, "Attempt %d", attempt);
+
+ absl::Mutex mu;
+ bool value = false; // condition value (under mu)
+
+ std::unique_ptr<absl::synchronization_internal::ThreadPool> pool =
+ CreateDefaultPool();
+ RunAfterDelay(params.satisfy_condition_delay, pool.get(), [&] {
+ absl::MutexLock l(&mu);
+ value = true;
+ });
+
+ absl::Time start_time = absl::Now();
+ bool result =
+ params.use_absolute_deadline
+ ? mu.ReaderLockWhenWithDeadline(absl::Condition(&value),
+ start_time + params.wait_timeout)
+ : mu.ReaderLockWhenWithTimeout(absl::Condition(&value),
+ params.wait_timeout);
+ mu.ReaderUnlock();
+
+ if (DelayIsWithinBounds(params.expected_delay, absl::Now() - start_time)) {
+ EXPECT_EQ(params.expected_result, result);
+ break;
+ }
+ }
+}
+
+TEST_P(TimeoutTest, Wait) {
+ const TimeoutTestParam params = GetParam();
+ ABSL_RAW_LOG(INFO, "Params: %s", FormatString(params).c_str());
+
+ // Because this test asserts bounds on scheduling delays it is flaky. To
+ // compensate it loops forever until it passes. Failures express as test
+ // timeouts, in which case the test log can be used to diagnose the issue.
+ for (int attempt = 0;; ++attempt) {
+ ABSL_RAW_LOG(INFO, "Attempt %d", attempt);
+
+ absl::Mutex mu;
+ bool value = false; // condition value (under mu)
+ absl::CondVar cv; // signals a change of `value`
+
+ std::unique_ptr<absl::synchronization_internal::ThreadPool> pool =
+ CreateDefaultPool();
+ RunAfterDelay(params.satisfy_condition_delay, pool.get(), [&] {
+ absl::MutexLock l(&mu);
+ value = true;
+ cv.Signal();
+ });
+
+ absl::MutexLock lock(&mu);
+ absl::Time start_time = absl::Now();
+ absl::Duration timeout = params.wait_timeout;
+ absl::Time deadline = start_time + timeout;
+ while (!value) {
+ if (params.use_absolute_deadline ? cv.WaitWithDeadline(&mu, deadline)
+ : cv.WaitWithTimeout(&mu, timeout)) {
+ break; // deadline/timeout exceeded
+ }
+ timeout = deadline - absl::Now(); // recompute
+ }
+ bool result = value; // note: `mu` is still held
+
+ if (DelayIsWithinBounds(params.expected_delay, absl::Now() - start_time)) {
+ EXPECT_EQ(params.expected_result, result);
+ break;
+ }
+ }
+}
+
+TEST(Mutex, Logging) {
+ // Allow user to look at logging output
+ absl::Mutex logged_mutex;
+ logged_mutex.EnableDebugLog("fido_mutex");
+ absl::CondVar logged_cv;
+ logged_cv.EnableDebugLog("rover_cv");
+ logged_mutex.Lock();
+ logged_cv.WaitWithTimeout(&logged_mutex, absl::Milliseconds(20));
+ logged_mutex.Unlock();
+ logged_mutex.ReaderLock();
+ logged_mutex.ReaderUnlock();
+ logged_mutex.Lock();
+ logged_mutex.Unlock();
+ logged_cv.Signal();
+ logged_cv.SignalAll();
+}
+
+// --------------------------------------------------------
+
+// Generate the vector of thread counts for tests parameterized on thread count.
+static std::vector<int> AllThreadCountValues() {
+ if (kExtendedTest) {
+ return {2, 4, 8, 10, 16, 20, 24, 30, 32};
+ }
+ return {2, 4, 10};
+}
+
+// A test fixture parameterized by thread count.
+class MutexVariableThreadCountTest : public ::testing::TestWithParam<int> {};
+
+// Instantiate the above with AllThreadCountOptions().
+INSTANTIATE_TEST_SUITE_P(ThreadCounts, MutexVariableThreadCountTest,
+ ::testing::ValuesIn(AllThreadCountValues()),
+ ::testing::PrintToStringParamName());
+
+// Reduces iterations by some factor for slow platforms
+// (determined empirically).
+static int ScaleIterations(int x) {
+ // ABSL_MUTEX_READER_LOCK_IS_EXCLUSIVE is set in the implementation
+ // of Mutex that uses either std::mutex or pthread_mutex_t. Use
+ // these as keys to determine the slow implementation.
+#if defined(ABSL_MUTEX_READER_LOCK_IS_EXCLUSIVE)
+ return x / 10;
+#else
+ return x;
+#endif
+}
+
+TEST_P(MutexVariableThreadCountTest, Mutex) {
+ int threads = GetParam();
+ int iterations = ScaleIterations(10000000) / threads;
+ int operations = threads * iterations;
+ EXPECT_EQ(RunTest(&TestMu, threads, iterations, operations), operations);
+#if !defined(ABSL_MUTEX_ENABLE_INVARIANT_DEBUGGING_NOT_IMPLEMENTED)
+ iterations = std::min(iterations, 10);
+ operations = threads * iterations;
+ EXPECT_EQ(RunTestWithInvariantDebugging(&TestMu, threads, iterations,
+ operations, CheckSumG0G1),
+ operations);
+#endif
+}
+
+TEST_P(MutexVariableThreadCountTest, Try) {
+ int threads = GetParam();
+ int iterations = 1000000 / threads;
+ int operations = iterations * threads;
+ EXPECT_EQ(RunTest(&TestTry, threads, iterations, operations), operations);
+#if !defined(ABSL_MUTEX_ENABLE_INVARIANT_DEBUGGING_NOT_IMPLEMENTED)
+ iterations = std::min(iterations, 10);
+ operations = threads * iterations;
+ EXPECT_EQ(RunTestWithInvariantDebugging(&TestTry, threads, iterations,
+ operations, CheckSumG0G1),
+ operations);
+#endif
+}
+
+TEST_P(MutexVariableThreadCountTest, R20ms) {
+ int threads = GetParam();
+ int iterations = 100;
+ int operations = iterations * threads;
+ EXPECT_EQ(RunTest(&TestR20ms, threads, iterations, operations), 0);
+}
+
+TEST_P(MutexVariableThreadCountTest, RW) {
+ int threads = GetParam();
+ int iterations = ScaleIterations(20000000) / threads;
+ int operations = iterations * threads;
+ EXPECT_EQ(RunTest(&TestRW, threads, iterations, operations), operations / 2);
+#if !defined(ABSL_MUTEX_ENABLE_INVARIANT_DEBUGGING_NOT_IMPLEMENTED)
+ iterations = std::min(iterations, 10);
+ operations = threads * iterations;
+ EXPECT_EQ(RunTestWithInvariantDebugging(&TestRW, threads, iterations,
+ operations, CheckSumG0G1),
+ operations / 2);
+#endif
+}
+
+TEST_P(MutexVariableThreadCountTest, Await) {
+ int threads = GetParam();
+ int iterations = ScaleIterations(500000);
+ int operations = iterations;
+ EXPECT_EQ(RunTest(&TestAwait, threads, iterations, operations), operations);
+}
+
+TEST_P(MutexVariableThreadCountTest, SignalAll) {
+ int threads = GetParam();
+ int iterations = 200000 / threads;
+ int operations = iterations;
+ EXPECT_EQ(RunTest(&TestSignalAll, threads, iterations, operations),
+ operations);
+}
+
+TEST(Mutex, Signal) {
+ int threads = 2; // TestSignal must use two threads
+ int iterations = 200000;
+ int operations = iterations;
+ EXPECT_EQ(RunTest(&TestSignal, threads, iterations, operations), operations);
+}
+
+TEST(Mutex, Timed) {
+ int threads = 10; // Use a fixed thread count of 10
+ int iterations = 1000;
+ int operations = iterations;
+ EXPECT_EQ(RunTest(&TestCVTimeout, threads, iterations, operations),
+ operations);
+}
+
+TEST(Mutex, CVTime) {
+ int threads = 10; // Use a fixed thread count of 10
+ int iterations = 1;
+ EXPECT_EQ(RunTest(&TestCVTime, threads, iterations, 1),
+ threads * iterations);
+}
+
+TEST(Mutex, MuTime) {
+ int threads = 10; // Use a fixed thread count of 10
+ int iterations = 1;
+ EXPECT_EQ(RunTest(&TestMuTime, threads, iterations, 1), threads * iterations);
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/synchronization/notification.cc b/third_party/abseil/src/absl/synchronization/notification.cc
new file mode 100644
index 0000000..e91b903
--- /dev/null
+++ b/third_party/abseil/src/absl/synchronization/notification.cc
@@ -0,0 +1,78 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/synchronization/notification.h"
+
+#include <atomic>
+
+#include "absl/base/attributes.h"
+#include "absl/base/internal/raw_logging.h"
+#include "absl/synchronization/mutex.h"
+#include "absl/time/time.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+void Notification::Notify() {
+ MutexLock l(&this->mutex_);
+
+#ifndef NDEBUG
+ if (ABSL_PREDICT_FALSE(notified_yet_.load(std::memory_order_relaxed))) {
+ ABSL_RAW_LOG(
+ FATAL,
+ "Notify() method called more than once for Notification object %p",
+ static_cast<void *>(this));
+ }
+#endif
+
+ notified_yet_.store(true, std::memory_order_release);
+}
+
+Notification::~Notification() {
+ // Make sure that the thread running Notify() exits before the object is
+ // destructed.
+ MutexLock l(&this->mutex_);
+}
+
+void Notification::WaitForNotification() const {
+ if (!HasBeenNotifiedInternal(&this->notified_yet_)) {
+ this->mutex_.LockWhen(Condition(&HasBeenNotifiedInternal,
+ &this->notified_yet_));
+ this->mutex_.Unlock();
+ }
+}
+
+bool Notification::WaitForNotificationWithTimeout(
+ absl::Duration timeout) const {
+ bool notified = HasBeenNotifiedInternal(&this->notified_yet_);
+ if (!notified) {
+ notified = this->mutex_.LockWhenWithTimeout(
+ Condition(&HasBeenNotifiedInternal, &this->notified_yet_), timeout);
+ this->mutex_.Unlock();
+ }
+ return notified;
+}
+
+bool Notification::WaitForNotificationWithDeadline(absl::Time deadline) const {
+ bool notified = HasBeenNotifiedInternal(&this->notified_yet_);
+ if (!notified) {
+ notified = this->mutex_.LockWhenWithDeadline(
+ Condition(&HasBeenNotifiedInternal, &this->notified_yet_), deadline);
+ this->mutex_.Unlock();
+ }
+ return notified;
+}
+
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/synchronization/notification.h b/third_party/abseil/src/absl/synchronization/notification.h
new file mode 100644
index 0000000..9a354ca
--- /dev/null
+++ b/third_party/abseil/src/absl/synchronization/notification.h
@@ -0,0 +1,123 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// notification.h
+// -----------------------------------------------------------------------------
+//
+// This header file defines a `Notification` abstraction, which allows threads
+// to receive notification of a single occurrence of a single event.
+//
+// The `Notification` object maintains a private boolean "notified" state that
+// transitions to `true` at most once. The `Notification` class provides the
+// following primary member functions:
+// * `HasBeenNotified() `to query its state
+// * `WaitForNotification*()` to have threads wait until the "notified" state
+// is `true`.
+// * `Notify()` to set the notification's "notified" state to `true` and
+// notify all waiting threads that the event has occurred.
+// This method may only be called once.
+//
+// Note that while `Notify()` may only be called once, it is perfectly valid to
+// call any of the `WaitForNotification*()` methods multiple times, from
+// multiple threads -- even after the notification's "notified" state has been
+// set -- in which case those methods will immediately return.
+//
+// Note that the lifetime of a `Notification` requires careful consideration;
+// it might not be safe to destroy a notification after calling `Notify()` since
+// it is still legal for other threads to call `WaitForNotification*()` methods
+// on the notification. However, observers responding to a "notified" state of
+// `true` can safely delete the notification without interfering with the call
+// to `Notify()` in the other thread.
+//
+// Memory ordering: For any threads X and Y, if X calls `Notify()`, then any
+// action taken by X before it calls `Notify()` is visible to thread Y after:
+// * Y returns from `WaitForNotification()`, or
+// * Y receives a `true` return value from either `HasBeenNotified()` or
+// `WaitForNotificationWithTimeout()`.
+
+#ifndef ABSL_SYNCHRONIZATION_NOTIFICATION_H_
+#define ABSL_SYNCHRONIZATION_NOTIFICATION_H_
+
+#include <atomic>
+
+#include "absl/base/macros.h"
+#include "absl/synchronization/mutex.h"
+#include "absl/time/time.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+// -----------------------------------------------------------------------------
+// Notification
+// -----------------------------------------------------------------------------
+class Notification {
+ public:
+ // Initializes the "notified" state to unnotified.
+ Notification() : notified_yet_(false) {}
+ explicit Notification(bool prenotify) : notified_yet_(prenotify) {}
+ Notification(const Notification&) = delete;
+ Notification& operator=(const Notification&) = delete;
+ ~Notification();
+
+ // Notification::HasBeenNotified()
+ //
+ // Returns the value of the notification's internal "notified" state.
+ bool HasBeenNotified() const {
+ return HasBeenNotifiedInternal(&this->notified_yet_);
+ }
+
+ // Notification::WaitForNotification()
+ //
+ // Blocks the calling thread until the notification's "notified" state is
+ // `true`. Note that if `Notify()` has been previously called on this
+ // notification, this function will immediately return.
+ void WaitForNotification() const;
+
+ // Notification::WaitForNotificationWithTimeout()
+ //
+ // Blocks until either the notification's "notified" state is `true` (which
+ // may occur immediately) or the timeout has elapsed, returning the value of
+ // its "notified" state in either case.
+ bool WaitForNotificationWithTimeout(absl::Duration timeout) const;
+
+ // Notification::WaitForNotificationWithDeadline()
+ //
+ // Blocks until either the notification's "notified" state is `true` (which
+ // may occur immediately) or the deadline has expired, returning the value of
+ // its "notified" state in either case.
+ bool WaitForNotificationWithDeadline(absl::Time deadline) const;
+
+ // Notification::Notify()
+ //
+ // Sets the "notified" state of this notification to `true` and wakes waiting
+ // threads. Note: do not call `Notify()` multiple times on the same
+ // `Notification`; calling `Notify()` more than once on the same notification
+ // results in undefined behavior.
+ void Notify();
+
+ private:
+ static inline bool HasBeenNotifiedInternal(
+ const std::atomic<bool>* notified_yet) {
+ return notified_yet->load(std::memory_order_acquire);
+ }
+
+ mutable Mutex mutex_;
+ std::atomic<bool> notified_yet_; // written under mutex_
+};
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_SYNCHRONIZATION_NOTIFICATION_H_
diff --git a/third_party/abseil/src/absl/synchronization/notification_test.cc b/third_party/abseil/src/absl/synchronization/notification_test.cc
new file mode 100644
index 0000000..100ea76
--- /dev/null
+++ b/third_party/abseil/src/absl/synchronization/notification_test.cc
@@ -0,0 +1,133 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/synchronization/notification.h"
+
+#include <thread> // NOLINT(build/c++11)
+#include <vector>
+
+#include "gtest/gtest.h"
+#include "absl/synchronization/mutex.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+// A thread-safe class that holds a counter.
+class ThreadSafeCounter {
+ public:
+ ThreadSafeCounter() : count_(0) {}
+
+ void Increment() {
+ MutexLock lock(&mutex_);
+ ++count_;
+ }
+
+ int Get() const {
+ MutexLock lock(&mutex_);
+ return count_;
+ }
+
+ void WaitUntilGreaterOrEqual(int n) {
+ MutexLock lock(&mutex_);
+ auto cond = [this, n]() { return count_ >= n; };
+ mutex_.Await(Condition(&cond));
+ }
+
+ private:
+ mutable Mutex mutex_;
+ int count_;
+};
+
+// Runs the |i|'th worker thread for the tests in BasicTests(). Increments the
+// |ready_counter|, waits on the |notification|, and then increments the
+// |done_counter|.
+static void RunWorker(int i, ThreadSafeCounter* ready_counter,
+ Notification* notification,
+ ThreadSafeCounter* done_counter) {
+ ready_counter->Increment();
+ notification->WaitForNotification();
+ done_counter->Increment();
+}
+
+// Tests that the |notification| properly blocks and awakens threads. Assumes
+// that the |notification| is not yet triggered. If |notify_before_waiting| is
+// true, the |notification| is triggered before any threads are created, so the
+// threads never block in WaitForNotification(). Otherwise, the |notification|
+// is triggered at a later point when most threads are likely to be blocking in
+// WaitForNotification().
+static void BasicTests(bool notify_before_waiting, Notification* notification) {
+ EXPECT_FALSE(notification->HasBeenNotified());
+ EXPECT_FALSE(
+ notification->WaitForNotificationWithTimeout(absl::Milliseconds(0)));
+ EXPECT_FALSE(notification->WaitForNotificationWithDeadline(absl::Now()));
+
+ const absl::Duration delay = absl::Milliseconds(50);
+ const absl::Time start = absl::Now();
+ EXPECT_FALSE(notification->WaitForNotificationWithTimeout(delay));
+ const absl::Duration elapsed = absl::Now() - start;
+
+ // Allow for a slight early return, to account for quality of implementation
+ // issues on various platforms.
+ const absl::Duration slop = absl::Microseconds(200);
+ EXPECT_LE(delay - slop, elapsed)
+ << "WaitForNotificationWithTimeout returned " << delay - elapsed
+ << " early (with " << slop << " slop), start time was " << start;
+
+ ThreadSafeCounter ready_counter;
+ ThreadSafeCounter done_counter;
+
+ if (notify_before_waiting) {
+ notification->Notify();
+ }
+
+ // Create a bunch of threads that increment the |done_counter| after being
+ // notified.
+ const int kNumThreads = 10;
+ std::vector<std::thread> workers;
+ for (int i = 0; i < kNumThreads; ++i) {
+ workers.push_back(std::thread(&RunWorker, i, &ready_counter, notification,
+ &done_counter));
+ }
+
+ if (!notify_before_waiting) {
+ ready_counter.WaitUntilGreaterOrEqual(kNumThreads);
+
+ // Workers have not been notified yet, so the |done_counter| should be
+ // unmodified.
+ EXPECT_EQ(0, done_counter.Get());
+
+ notification->Notify();
+ }
+
+ // After notifying and then joining the workers, both counters should be
+ // fully incremented.
+ notification->WaitForNotification(); // should exit immediately
+ EXPECT_TRUE(notification->HasBeenNotified());
+ EXPECT_TRUE(notification->WaitForNotificationWithTimeout(absl::Seconds(0)));
+ EXPECT_TRUE(notification->WaitForNotificationWithDeadline(absl::Now()));
+ for (std::thread& worker : workers) {
+ worker.join();
+ }
+ EXPECT_EQ(kNumThreads, ready_counter.Get());
+ EXPECT_EQ(kNumThreads, done_counter.Get());
+}
+
+TEST(NotificationTest, SanityTest) {
+ Notification local_notification1, local_notification2;
+ BasicTests(false, &local_notification1);
+ BasicTests(true, &local_notification2);
+}
+
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/time/BUILD.bazel b/third_party/abseil/src/absl/time/BUILD.bazel
new file mode 100644
index 0000000..991241a
--- /dev/null
+++ b/third_party/abseil/src/absl/time/BUILD.bazel
@@ -0,0 +1,125 @@
+#
+# Copyright 2017 The Abseil Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+load("@rules_cc//cc:defs.bzl", "cc_library", "cc_test")
+load(
+ "//absl:copts/configure_copts.bzl",
+ "ABSL_DEFAULT_COPTS",
+ "ABSL_DEFAULT_LINKOPTS",
+ "ABSL_TEST_COPTS",
+)
+
+package(default_visibility = ["//visibility:public"])
+
+licenses(["notice"])
+
+cc_library(
+ name = "time",
+ srcs = [
+ "civil_time.cc",
+ "clock.cc",
+ "duration.cc",
+ "format.cc",
+ "internal/get_current_time_chrono.inc",
+ "internal/get_current_time_posix.inc",
+ "time.cc",
+ ],
+ hdrs = [
+ "civil_time.h",
+ "clock.h",
+ "time.h",
+ ],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ "//absl/base",
+ "//absl/base:core_headers",
+ "//absl/base:raw_logging_internal",
+ "//absl/numeric:int128",
+ "//absl/strings",
+ "//absl/time/internal/cctz:civil_time",
+ "//absl/time/internal/cctz:time_zone",
+ ],
+)
+
+cc_library(
+ name = "test_util",
+ testonly = 1,
+ srcs = [
+ "internal/test_util.cc",
+ "internal/zoneinfo.inc",
+ ],
+ hdrs = ["internal/test_util.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ visibility = [
+ "//absl/time:__pkg__",
+ ],
+ deps = [
+ ":time",
+ "//absl/base:config",
+ "//absl/base:raw_logging_internal",
+ "//absl/time/internal/cctz:time_zone",
+ "@com_google_googletest//:gtest",
+ ],
+)
+
+cc_test(
+ name = "time_test",
+ srcs = [
+ "civil_time_test.cc",
+ "clock_test.cc",
+ "duration_test.cc",
+ "format_test.cc",
+ "time_test.cc",
+ "time_zone_test.cc",
+ ],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":test_util",
+ ":time",
+ "//absl/base:config",
+ "//absl/base:core_headers",
+ "//absl/numeric:int128",
+ "//absl/time/internal/cctz:time_zone",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "time_benchmark",
+ srcs = [
+ "civil_time_benchmark.cc",
+ "clock_benchmark.cc",
+ "duration_benchmark.cc",
+ "format_benchmark.cc",
+ "time_benchmark.cc",
+ ],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ tags = [
+ "benchmark",
+ ],
+ deps = [
+ ":test_util",
+ ":time",
+ "//absl/base",
+ "//absl/base:core_headers",
+ "//absl/hash",
+ "@com_github_google_benchmark//:benchmark_main",
+ ],
+)
diff --git a/third_party/abseil/src/absl/time/CMakeLists.txt b/third_party/abseil/src/absl/time/CMakeLists.txt
new file mode 100644
index 0000000..00bdd49
--- /dev/null
+++ b/third_party/abseil/src/absl/time/CMakeLists.txt
@@ -0,0 +1,128 @@
+#
+# Copyright 2017 The Abseil Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+absl_cc_library(
+ NAME
+ time
+ HDRS
+ "civil_time.h"
+ "clock.h"
+ "time.h"
+ SRCS
+ "civil_time.cc"
+ "clock.cc"
+ "duration.cc"
+ "format.cc"
+ "internal/get_current_time_chrono.inc"
+ "internal/get_current_time_posix.inc"
+ "time.cc"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::base
+ absl::civil_time
+ absl::core_headers
+ absl::int128
+ absl::raw_logging_internal
+ absl::strings
+ absl::time_zone
+ PUBLIC
+)
+
+absl_cc_library(
+ NAME
+ civil_time
+ HDRS
+ "internal/cctz/include/cctz/civil_time.h"
+ "internal/cctz/include/cctz/civil_time_detail.h"
+ SRCS
+ "internal/cctz/src/civil_time_detail.cc"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+)
+
+if(APPLE)
+ find_library(CoreFoundation CoreFoundation)
+endif()
+
+absl_cc_library(
+ NAME
+ time_zone
+ HDRS
+ "internal/cctz/include/cctz/time_zone.h"
+ "internal/cctz/include/cctz/zone_info_source.h"
+ SRCS
+ "internal/cctz/src/time_zone_fixed.cc"
+ "internal/cctz/src/time_zone_fixed.h"
+ "internal/cctz/src/time_zone_format.cc"
+ "internal/cctz/src/time_zone_if.cc"
+ "internal/cctz/src/time_zone_if.h"
+ "internal/cctz/src/time_zone_impl.cc"
+ "internal/cctz/src/time_zone_impl.h"
+ "internal/cctz/src/time_zone_info.cc"
+ "internal/cctz/src/time_zone_info.h"
+ "internal/cctz/src/time_zone_libc.cc"
+ "internal/cctz/src/time_zone_libc.h"
+ "internal/cctz/src/time_zone_lookup.cc"
+ "internal/cctz/src/time_zone_posix.cc"
+ "internal/cctz/src/time_zone_posix.h"
+ "internal/cctz/src/tzfile.h"
+ "internal/cctz/src/zone_info_source.cc"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ $<$<PLATFORM_ID:Darwin>:${CoreFoundation}>
+)
+
+absl_cc_library(
+ NAME
+ time_internal_test_util
+ HDRS
+ "internal/test_util.h"
+ SRCS
+ "internal/test_util.cc"
+ "internal/zoneinfo.inc"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::time
+ absl::config
+ absl::raw_logging_internal
+ absl::time_zone
+ gmock
+ TESTONLY
+)
+
+absl_cc_test(
+ NAME
+ time_test
+ SRCS
+ "civil_time_test.cc"
+ "clock_test.cc"
+ "duration_test.cc"
+ "format_test.cc"
+ "time_test.cc"
+ "time_zone_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::time_internal_test_util
+ absl::time
+ absl::config
+ absl::core_headers
+ absl::time_zone
+ gmock_main
+)
diff --git a/third_party/abseil/src/absl/time/civil_time.cc b/third_party/abseil/src/absl/time/civil_time.cc
new file mode 100644
index 0000000..bdfe9ce
--- /dev/null
+++ b/third_party/abseil/src/absl/time/civil_time.cc
@@ -0,0 +1,175 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/time/civil_time.h"
+
+#include <cstdlib>
+#include <string>
+
+#include "absl/strings/str_cat.h"
+#include "absl/time/time.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+namespace {
+
+// Since a civil time has a larger year range than absl::Time (64-bit years vs
+// 64-bit seconds, respectively) we normalize years to roughly +/- 400 years
+// around the year 2400, which will produce an equivalent year in a range that
+// absl::Time can handle.
+inline civil_year_t NormalizeYear(civil_year_t year) {
+ return 2400 + year % 400;
+}
+
+// Formats the given CivilSecond according to the given format.
+std::string FormatYearAnd(string_view fmt, CivilSecond cs) {
+ const CivilSecond ncs(NormalizeYear(cs.year()), cs.month(), cs.day(),
+ cs.hour(), cs.minute(), cs.second());
+ const TimeZone utc = UTCTimeZone();
+ // TODO(absl-team): Avoid conversion of fmt string.
+ return StrCat(cs.year(),
+ FormatTime(std::string(fmt), FromCivil(ncs, utc), utc));
+}
+
+template <typename CivilT>
+bool ParseYearAnd(string_view fmt, string_view s, CivilT* c) {
+ // Civil times support a larger year range than absl::Time, so we need to
+ // parse the year separately, normalize it, then use absl::ParseTime on the
+ // normalized string.
+ const std::string ss = std::string(s); // TODO(absl-team): Avoid conversion.
+ const char* const np = ss.c_str();
+ char* endp;
+ errno = 0;
+ const civil_year_t y =
+ std::strtoll(np, &endp, 10); // NOLINT(runtime/deprecated_fn)
+ if (endp == np || errno == ERANGE) return false;
+ const std::string norm = StrCat(NormalizeYear(y), endp);
+
+ const TimeZone utc = UTCTimeZone();
+ Time t;
+ if (ParseTime(StrCat("%Y", fmt), norm, utc, &t, nullptr)) {
+ const auto cs = ToCivilSecond(t, utc);
+ *c = CivilT(y, cs.month(), cs.day(), cs.hour(), cs.minute(), cs.second());
+ return true;
+ }
+
+ return false;
+}
+
+// Tries to parse the type as a CivilT1, but then assigns the result to the
+// argument of type CivilT2.
+template <typename CivilT1, typename CivilT2>
+bool ParseAs(string_view s, CivilT2* c) {
+ CivilT1 t1;
+ if (ParseCivilTime(s, &t1)) {
+ *c = CivilT2(t1);
+ return true;
+ }
+ return false;
+}
+
+template <typename CivilT>
+bool ParseLenient(string_view s, CivilT* c) {
+ // A fastpath for when the given string data parses exactly into the given
+ // type T (e.g., s="YYYY-MM-DD" and CivilT=CivilDay).
+ if (ParseCivilTime(s, c)) return true;
+ // Try parsing as each of the 6 types, trying the most common types first
+ // (based on csearch results).
+ if (ParseAs<CivilDay>(s, c)) return true;
+ if (ParseAs<CivilSecond>(s, c)) return true;
+ if (ParseAs<CivilHour>(s, c)) return true;
+ if (ParseAs<CivilMonth>(s, c)) return true;
+ if (ParseAs<CivilMinute>(s, c)) return true;
+ if (ParseAs<CivilYear>(s, c)) return true;
+ return false;
+}
+} // namespace
+
+std::string FormatCivilTime(CivilSecond c) {
+ return FormatYearAnd("-%m-%d%ET%H:%M:%S", c);
+}
+std::string FormatCivilTime(CivilMinute c) {
+ return FormatYearAnd("-%m-%d%ET%H:%M", c);
+}
+std::string FormatCivilTime(CivilHour c) {
+ return FormatYearAnd("-%m-%d%ET%H", c);
+}
+std::string FormatCivilTime(CivilDay c) { return FormatYearAnd("-%m-%d", c); }
+std::string FormatCivilTime(CivilMonth c) { return FormatYearAnd("-%m", c); }
+std::string FormatCivilTime(CivilYear c) { return FormatYearAnd("", c); }
+
+bool ParseCivilTime(string_view s, CivilSecond* c) {
+ return ParseYearAnd("-%m-%d%ET%H:%M:%S", s, c);
+}
+bool ParseCivilTime(string_view s, CivilMinute* c) {
+ return ParseYearAnd("-%m-%d%ET%H:%M", s, c);
+}
+bool ParseCivilTime(string_view s, CivilHour* c) {
+ return ParseYearAnd("-%m-%d%ET%H", s, c);
+}
+bool ParseCivilTime(string_view s, CivilDay* c) {
+ return ParseYearAnd("-%m-%d", s, c);
+}
+bool ParseCivilTime(string_view s, CivilMonth* c) {
+ return ParseYearAnd("-%m", s, c);
+}
+bool ParseCivilTime(string_view s, CivilYear* c) {
+ return ParseYearAnd("", s, c);
+}
+
+bool ParseLenientCivilTime(string_view s, CivilSecond* c) {
+ return ParseLenient(s, c);
+}
+bool ParseLenientCivilTime(string_view s, CivilMinute* c) {
+ return ParseLenient(s, c);
+}
+bool ParseLenientCivilTime(string_view s, CivilHour* c) {
+ return ParseLenient(s, c);
+}
+bool ParseLenientCivilTime(string_view s, CivilDay* c) {
+ return ParseLenient(s, c);
+}
+bool ParseLenientCivilTime(string_view s, CivilMonth* c) {
+ return ParseLenient(s, c);
+}
+bool ParseLenientCivilTime(string_view s, CivilYear* c) {
+ return ParseLenient(s, c);
+}
+
+namespace time_internal {
+
+std::ostream& operator<<(std::ostream& os, CivilYear y) {
+ return os << FormatCivilTime(y);
+}
+std::ostream& operator<<(std::ostream& os, CivilMonth m) {
+ return os << FormatCivilTime(m);
+}
+std::ostream& operator<<(std::ostream& os, CivilDay d) {
+ return os << FormatCivilTime(d);
+}
+std::ostream& operator<<(std::ostream& os, CivilHour h) {
+ return os << FormatCivilTime(h);
+}
+std::ostream& operator<<(std::ostream& os, CivilMinute m) {
+ return os << FormatCivilTime(m);
+}
+std::ostream& operator<<(std::ostream& os, CivilSecond s) {
+ return os << FormatCivilTime(s);
+}
+
+} // namespace time_internal
+
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/time/civil_time.h b/third_party/abseil/src/absl/time/civil_time.h
new file mode 100644
index 0000000..bb46004
--- /dev/null
+++ b/third_party/abseil/src/absl/time/civil_time.h
@@ -0,0 +1,538 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: civil_time.h
+// -----------------------------------------------------------------------------
+//
+// This header file defines abstractions for computing with "civil time".
+// The term "civil time" refers to the legally recognized human-scale time
+// that is represented by the six fields `YYYY-MM-DD hh:mm:ss`. A "date"
+// is perhaps the most common example of a civil time (represented here as
+// an `absl::CivilDay`).
+//
+// Modern-day civil time follows the Gregorian Calendar and is a
+// time-zone-independent concept: a civil time of "2015-06-01 12:00:00", for
+// example, is not tied to a time zone. Put another way, a civil time does not
+// map to a unique point in time; a civil time must be mapped to an absolute
+// time *through* a time zone.
+//
+// Because a civil time is what most people think of as "time," it is common to
+// map absolute times to civil times to present to users.
+//
+// Time zones define the relationship between absolute and civil times. Given an
+// absolute or civil time and a time zone, you can compute the other time:
+//
+// Civil Time = F(Absolute Time, Time Zone)
+// Absolute Time = G(Civil Time, Time Zone)
+//
+// The Abseil time library allows you to construct such civil times from
+// absolute times; consult time.h for such functionality.
+//
+// This library provides six classes for constructing civil-time objects, and
+// provides several helper functions for rounding, iterating, and performing
+// arithmetic on civil-time objects, while avoiding complications like
+// daylight-saving time (DST):
+//
+// * `absl::CivilSecond`
+// * `absl::CivilMinute`
+// * `absl::CivilHour`
+// * `absl::CivilDay`
+// * `absl::CivilMonth`
+// * `absl::CivilYear`
+//
+// Example:
+//
+// // Construct a civil-time object for a specific day
+// const absl::CivilDay cd(1969, 07, 20);
+//
+// // Construct a civil-time object for a specific second
+// const absl::CivilSecond cd(2018, 8, 1, 12, 0, 1);
+//
+// Note: In C++14 and later, this library is usable in a constexpr context.
+//
+// Example:
+//
+// // Valid in C++14
+// constexpr absl::CivilDay cd(1969, 07, 20);
+
+#ifndef ABSL_TIME_CIVIL_TIME_H_
+#define ABSL_TIME_CIVIL_TIME_H_
+
+#include <string>
+
+#include "absl/strings/string_view.h"
+#include "absl/time/internal/cctz/include/cctz/civil_time.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+namespace time_internal {
+struct second_tag : cctz::detail::second_tag {};
+struct minute_tag : second_tag, cctz::detail::minute_tag {};
+struct hour_tag : minute_tag, cctz::detail::hour_tag {};
+struct day_tag : hour_tag, cctz::detail::day_tag {};
+struct month_tag : day_tag, cctz::detail::month_tag {};
+struct year_tag : month_tag, cctz::detail::year_tag {};
+} // namespace time_internal
+
+// -----------------------------------------------------------------------------
+// CivilSecond, CivilMinute, CivilHour, CivilDay, CivilMonth, CivilYear
+// -----------------------------------------------------------------------------
+//
+// Each of these civil-time types is a simple value type with the same
+// interface for construction and the same six accessors for each of the civil
+// time fields (year, month, day, hour, minute, and second, aka YMDHMS). These
+// classes differ only in their alignment, which is indicated by the type name
+// and specifies the field on which arithmetic operates.
+//
+// CONSTRUCTION
+//
+// Each of the civil-time types can be constructed in two ways: by directly
+// passing to the constructor up to six integers representing the YMDHMS fields,
+// or by copying the YMDHMS fields from a differently aligned civil-time type.
+// Omitted fields are assigned their minimum valid value. Hours, minutes, and
+// seconds will be set to 0, month and day will be set to 1. Since there is no
+// minimum year, the default is 1970.
+//
+// Examples:
+//
+// absl::CivilDay default_value; // 1970-01-01 00:00:00
+//
+// absl::CivilDay a(2015, 2, 3); // 2015-02-03 00:00:00
+// absl::CivilDay b(2015, 2, 3, 4, 5, 6); // 2015-02-03 00:00:00
+// absl::CivilDay c(2015); // 2015-01-01 00:00:00
+//
+// absl::CivilSecond ss(2015, 2, 3, 4, 5, 6); // 2015-02-03 04:05:06
+// absl::CivilMinute mm(ss); // 2015-02-03 04:05:00
+// absl::CivilHour hh(mm); // 2015-02-03 04:00:00
+// absl::CivilDay d(hh); // 2015-02-03 00:00:00
+// absl::CivilMonth m(d); // 2015-02-01 00:00:00
+// absl::CivilYear y(m); // 2015-01-01 00:00:00
+//
+// m = absl::CivilMonth(y); // 2015-01-01 00:00:00
+// d = absl::CivilDay(m); // 2015-01-01 00:00:00
+// hh = absl::CivilHour(d); // 2015-01-01 00:00:00
+// mm = absl::CivilMinute(hh); // 2015-01-01 00:00:00
+// ss = absl::CivilSecond(mm); // 2015-01-01 00:00:00
+//
+// Each civil-time class is aligned to the civil-time field indicated in the
+// class's name after normalization. Alignment is performed by setting all the
+// inferior fields to their minimum valid value (as described above). The
+// following are examples of how each of the six types would align the fields
+// representing November 22, 2015 at 12:34:56 in the afternoon. (Note: the
+// string format used here is not important; it's just a shorthand way of
+// showing the six YMDHMS fields.)
+//
+// absl::CivilSecond : 2015-11-22 12:34:56
+// absl::CivilMinute : 2015-11-22 12:34:00
+// absl::CivilHour : 2015-11-22 12:00:00
+// absl::CivilDay : 2015-11-22 00:00:00
+// absl::CivilMonth : 2015-11-01 00:00:00
+// absl::CivilYear : 2015-01-01 00:00:00
+//
+// Each civil-time type performs arithmetic on the field to which it is
+// aligned. This means that adding 1 to an absl::CivilDay increments the day
+// field (normalizing as necessary), and subtracting 7 from an absl::CivilMonth
+// operates on the month field (normalizing as necessary). All arithmetic
+// produces a valid civil time. Difference requires two similarly aligned
+// civil-time objects and returns the scalar answer in units of the objects'
+// alignment. For example, the difference between two absl::CivilHour objects
+// will give an answer in units of civil hours.
+//
+// ALIGNMENT CONVERSION
+//
+// The alignment of a civil-time object cannot change, but the object may be
+// used to construct a new object with a different alignment. This is referred
+// to as "realigning". When realigning to a type with the same or more
+// precision (e.g., absl::CivilDay -> absl::CivilSecond), the conversion may be
+// performed implicitly since no information is lost. However, if information
+// could be discarded (e.g., CivilSecond -> CivilDay), the conversion must
+// be explicit at the call site.
+//
+// Examples:
+//
+// void UseDay(absl::CivilDay day);
+//
+// absl::CivilSecond cs;
+// UseDay(cs); // Won't compile because data may be discarded
+// UseDay(absl::CivilDay(cs)); // OK: explicit conversion
+//
+// absl::CivilDay cd;
+// UseDay(cd); // OK: no conversion needed
+//
+// absl::CivilMonth cm;
+// UseDay(cm); // OK: implicit conversion to absl::CivilDay
+//
+// NORMALIZATION
+//
+// Normalization takes invalid values and adjusts them to produce valid values.
+// Within the civil-time library, integer arguments passed to the Civil*
+// constructors may be out-of-range, in which case they are normalized by
+// carrying overflow into a field of courser granularity to produce valid
+// civil-time objects. This normalization enables natural arithmetic on
+// constructor arguments without worrying about the field's range.
+//
+// Examples:
+//
+// // Out-of-range; normalized to 2016-11-01
+// absl::CivilDay d(2016, 10, 32);
+// // Out-of-range, negative: normalized to 2016-10-30T23
+// absl::CivilHour h1(2016, 10, 31, -1);
+// // Normalization is cumulative: normalized to 2016-10-30T23
+// absl::CivilHour h2(2016, 10, 32, -25);
+//
+// Note: If normalization is undesired, you can signal an error by comparing
+// the constructor arguments to the normalized values returned by the YMDHMS
+// properties.
+//
+// COMPARISON
+//
+// Comparison between civil-time objects considers all six YMDHMS fields,
+// regardless of the type's alignment. Comparison between differently aligned
+// civil-time types is allowed.
+//
+// Examples:
+//
+// absl::CivilDay feb_3(2015, 2, 3); // 2015-02-03 00:00:00
+// absl::CivilDay mar_4(2015, 3, 4); // 2015-03-04 00:00:00
+// // feb_3 < mar_4
+// // absl::CivilYear(feb_3) == absl::CivilYear(mar_4)
+//
+// absl::CivilSecond feb_3_noon(2015, 2, 3, 12, 0, 0); // 2015-02-03 12:00:00
+// // feb_3 < feb_3_noon
+// // feb_3 == absl::CivilDay(feb_3_noon)
+//
+// // Iterates all the days of February 2015.
+// for (absl::CivilDay d(2015, 2, 1); d < absl::CivilMonth(2015, 3); ++d) {
+// // ...
+// }
+//
+// ARITHMETIC
+//
+// Civil-time types support natural arithmetic operators such as addition,
+// subtraction, and difference. Arithmetic operates on the civil-time field
+// indicated in the type's name. Difference operators require arguments with
+// the same alignment and return the answer in units of the alignment.
+//
+// Example:
+//
+// absl::CivilDay a(2015, 2, 3);
+// ++a; // 2015-02-04 00:00:00
+// --a; // 2015-02-03 00:00:00
+// absl::CivilDay b = a + 1; // 2015-02-04 00:00:00
+// absl::CivilDay c = 1 + b; // 2015-02-05 00:00:00
+// int n = c - a; // n = 2 (civil days)
+// int m = c - absl::CivilMonth(c); // Won't compile: different types.
+//
+// ACCESSORS
+//
+// Each civil-time type has accessors for all six of the civil-time fields:
+// year, month, day, hour, minute, and second.
+//
+// civil_year_t year()
+// int month()
+// int day()
+// int hour()
+// int minute()
+// int second()
+//
+// Recall that fields inferior to the type's alignment will be set to their
+// minimum valid value.
+//
+// Example:
+//
+// absl::CivilDay d(2015, 6, 28);
+// // d.year() == 2015
+// // d.month() == 6
+// // d.day() == 28
+// // d.hour() == 0
+// // d.minute() == 0
+// // d.second() == 0
+//
+// CASE STUDY: Adding a month to January 31.
+//
+// One of the classic questions that arises when considering a civil time
+// library (or a date library or a date/time library) is this:
+// "What is the result of adding a month to January 31?"
+// This is an interesting question because it is unclear what is meant by a
+// "month", and several different answers are possible, depending on context:
+//
+// 1. March 3 (or 2 if a leap year), if "add a month" means to add a month to
+// the current month, and adjust the date to overflow the extra days into
+// March. In this case the result of "February 31" would be normalized as
+// within the civil-time library.
+// 2. February 28 (or 29 if a leap year), if "add a month" means to add a
+// month, and adjust the date while holding the resulting month constant.
+// In this case, the result of "February 31" would be truncated to the last
+// day in February.
+// 3. An error. The caller may get some error, an exception, an invalid date
+// object, or perhaps return `false`. This may make sense because there is
+// no single unambiguously correct answer to the question.
+//
+// Practically speaking, any answer that is not what the programmer intended
+// is the wrong answer.
+//
+// The Abseil time library avoids this problem by making it impossible to
+// ask ambiguous questions. All civil-time objects are aligned to a particular
+// civil-field boundary (such as aligned to a year, month, day, hour, minute,
+// or second), and arithmetic operates on the field to which the object is
+// aligned. This means that in order to "add a month" the object must first be
+// aligned to a month boundary, which is equivalent to the first day of that
+// month.
+//
+// Of course, there are ways to compute an answer the question at hand using
+// this Abseil time library, but they require the programmer to be explicit
+// about the answer they expect. To illustrate, let's see how to compute all
+// three of the above possible answers to the question of "Jan 31 plus 1
+// month":
+//
+// Example:
+//
+// const absl::CivilDay d(2015, 1, 31);
+//
+// // Answer 1:
+// // Add 1 to the month field in the constructor, and rely on normalization.
+// const auto normalized = absl::CivilDay(d.year(), d.month() + 1, d.day());
+// // normalized == 2015-03-03 (aka Feb 31)
+//
+// // Answer 2:
+// // Add 1 to month field, capping to the end of next month.
+// const auto next_month = absl::CivilMonth(d) + 1;
+// const auto last_day_of_next_month = absl::CivilDay(next_month + 1) - 1;
+// const auto capped = std::min(normalized, last_day_of_next_month);
+// // capped == 2015-02-28
+//
+// // Answer 3:
+// // Signal an error if the normalized answer is not in next month.
+// if (absl::CivilMonth(normalized) != next_month) {
+// // error, month overflow
+// }
+//
+using CivilSecond =
+ time_internal::cctz::detail::civil_time<time_internal::second_tag>;
+using CivilMinute =
+ time_internal::cctz::detail::civil_time<time_internal::minute_tag>;
+using CivilHour =
+ time_internal::cctz::detail::civil_time<time_internal::hour_tag>;
+using CivilDay =
+ time_internal::cctz::detail::civil_time<time_internal::day_tag>;
+using CivilMonth =
+ time_internal::cctz::detail::civil_time<time_internal::month_tag>;
+using CivilYear =
+ time_internal::cctz::detail::civil_time<time_internal::year_tag>;
+
+// civil_year_t
+//
+// Type alias of a civil-time year value. This type is guaranteed to (at least)
+// support any year value supported by `time_t`.
+//
+// Example:
+//
+// absl::CivilSecond cs = ...;
+// absl::civil_year_t y = cs.year();
+// cs = absl::CivilSecond(y, 1, 1, 0, 0, 0); // CivilSecond(CivilYear(cs))
+//
+using civil_year_t = time_internal::cctz::year_t;
+
+// civil_diff_t
+//
+// Type alias of the difference between two civil-time values.
+// This type is used to indicate arguments that are not
+// normalized (such as parameters to the civil-time constructors), the results
+// of civil-time subtraction, or the operand to civil-time addition.
+//
+// Example:
+//
+// absl::civil_diff_t n_sec = cs1 - cs2; // cs1 == cs2 + n_sec;
+//
+using civil_diff_t = time_internal::cctz::diff_t;
+
+// Weekday::monday, Weekday::tuesday, Weekday::wednesday, Weekday::thursday,
+// Weekday::friday, Weekday::saturday, Weekday::sunday
+//
+// The Weekday enum class represents the civil-time concept of a "weekday" with
+// members for all days of the week.
+//
+// absl::Weekday wd = absl::Weekday::thursday;
+//
+using Weekday = time_internal::cctz::weekday;
+
+// GetWeekday()
+//
+// Returns the absl::Weekday for the given (realigned) civil-time value.
+//
+// Example:
+//
+// absl::CivilDay a(2015, 8, 13);
+// absl::Weekday wd = absl::GetWeekday(a); // wd == absl::Weekday::thursday
+//
+inline Weekday GetWeekday(CivilSecond cs) {
+ return time_internal::cctz::get_weekday(cs);
+}
+
+// NextWeekday()
+// PrevWeekday()
+//
+// Returns the absl::CivilDay that strictly follows or precedes a given
+// absl::CivilDay, and that falls on the given absl::Weekday.
+//
+// Example, given the following month:
+//
+// August 2015
+// Su Mo Tu We Th Fr Sa
+// 1
+// 2 3 4 5 6 7 8
+// 9 10 11 12 13 14 15
+// 16 17 18 19 20 21 22
+// 23 24 25 26 27 28 29
+// 30 31
+//
+// absl::CivilDay a(2015, 8, 13);
+// // absl::GetWeekday(a) == absl::Weekday::thursday
+// absl::CivilDay b = absl::NextWeekday(a, absl::Weekday::thursday);
+// // b = 2015-08-20
+// absl::CivilDay c = absl::PrevWeekday(a, absl::Weekday::thursday);
+// // c = 2015-08-06
+//
+// absl::CivilDay d = ...
+// // Gets the following Thursday if d is not already Thursday
+// absl::CivilDay thurs1 = absl::NextWeekday(d - 1, absl::Weekday::thursday);
+// // Gets the previous Thursday if d is not already Thursday
+// absl::CivilDay thurs2 = absl::PrevWeekday(d + 1, absl::Weekday::thursday);
+//
+inline CivilDay NextWeekday(CivilDay cd, Weekday wd) {
+ return CivilDay(time_internal::cctz::next_weekday(cd, wd));
+}
+inline CivilDay PrevWeekday(CivilDay cd, Weekday wd) {
+ return CivilDay(time_internal::cctz::prev_weekday(cd, wd));
+}
+
+// GetYearDay()
+//
+// Returns the day-of-year for the given (realigned) civil-time value.
+//
+// Example:
+//
+// absl::CivilDay a(2015, 1, 1);
+// int yd_jan_1 = absl::GetYearDay(a); // yd_jan_1 = 1
+// absl::CivilDay b(2015, 12, 31);
+// int yd_dec_31 = absl::GetYearDay(b); // yd_dec_31 = 365
+//
+inline int GetYearDay(CivilSecond cs) {
+ return time_internal::cctz::get_yearday(cs);
+}
+
+// FormatCivilTime()
+//
+// Formats the given civil-time value into a string value of the following
+// format:
+//
+// Type | Format
+// ---------------------------------
+// CivilSecond | YYYY-MM-DDTHH:MM:SS
+// CivilMinute | YYYY-MM-DDTHH:MM
+// CivilHour | YYYY-MM-DDTHH
+// CivilDay | YYYY-MM-DD
+// CivilMonth | YYYY-MM
+// CivilYear | YYYY
+//
+// Example:
+//
+// absl::CivilDay d = absl::CivilDay(1969, 7, 20);
+// std::string day_string = absl::FormatCivilTime(d); // "1969-07-20"
+//
+std::string FormatCivilTime(CivilSecond c);
+std::string FormatCivilTime(CivilMinute c);
+std::string FormatCivilTime(CivilHour c);
+std::string FormatCivilTime(CivilDay c);
+std::string FormatCivilTime(CivilMonth c);
+std::string FormatCivilTime(CivilYear c);
+
+// absl::ParseCivilTime()
+//
+// Parses a civil-time value from the specified `absl::string_view` into the
+// passed output parameter. Returns `true` upon successful parsing.
+//
+// The expected form of the input string is as follows:
+//
+// Type | Format
+// ---------------------------------
+// CivilSecond | YYYY-MM-DDTHH:MM:SS
+// CivilMinute | YYYY-MM-DDTHH:MM
+// CivilHour | YYYY-MM-DDTHH
+// CivilDay | YYYY-MM-DD
+// CivilMonth | YYYY-MM
+// CivilYear | YYYY
+//
+// Example:
+//
+// absl::CivilDay d;
+// bool ok = absl::ParseCivilTime("2018-01-02", &d); // OK
+//
+// Note that parsing will fail if the string's format does not match the
+// expected type exactly. `ParseLenientCivilTime()` below is more lenient.
+//
+bool ParseCivilTime(absl::string_view s, CivilSecond* c);
+bool ParseCivilTime(absl::string_view s, CivilMinute* c);
+bool ParseCivilTime(absl::string_view s, CivilHour* c);
+bool ParseCivilTime(absl::string_view s, CivilDay* c);
+bool ParseCivilTime(absl::string_view s, CivilMonth* c);
+bool ParseCivilTime(absl::string_view s, CivilYear* c);
+
+// ParseLenientCivilTime()
+//
+// Parses any of the formats accepted by `absl::ParseCivilTime()`, but is more
+// lenient if the format of the string does not exactly match the associated
+// type.
+//
+// Example:
+//
+// absl::CivilDay d;
+// bool ok = absl::ParseLenientCivilTime("1969-07-20", &d); // OK
+// ok = absl::ParseLenientCivilTime("1969-07-20T10", &d); // OK: T10 floored
+// ok = absl::ParseLenientCivilTime("1969-07", &d); // OK: day defaults to 1
+//
+bool ParseLenientCivilTime(absl::string_view s, CivilSecond* c);
+bool ParseLenientCivilTime(absl::string_view s, CivilMinute* c);
+bool ParseLenientCivilTime(absl::string_view s, CivilHour* c);
+bool ParseLenientCivilTime(absl::string_view s, CivilDay* c);
+bool ParseLenientCivilTime(absl::string_view s, CivilMonth* c);
+bool ParseLenientCivilTime(absl::string_view s, CivilYear* c);
+
+namespace time_internal { // For functions found via ADL on civil-time tags.
+
+// Streaming Operators
+//
+// Each civil-time type may be sent to an output stream using operator<<().
+// The result matches the string produced by `FormatCivilTime()`.
+//
+// Example:
+//
+// absl::CivilDay d = absl::CivilDay(1969, 7, 20);
+// std::cout << "Date is: " << d << "\n";
+//
+std::ostream& operator<<(std::ostream& os, CivilYear y);
+std::ostream& operator<<(std::ostream& os, CivilMonth m);
+std::ostream& operator<<(std::ostream& os, CivilDay d);
+std::ostream& operator<<(std::ostream& os, CivilHour h);
+std::ostream& operator<<(std::ostream& os, CivilMinute m);
+std::ostream& operator<<(std::ostream& os, CivilSecond s);
+
+} // namespace time_internal
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_TIME_CIVIL_TIME_H_
diff --git a/third_party/abseil/src/absl/time/civil_time_benchmark.cc b/third_party/abseil/src/absl/time/civil_time_benchmark.cc
new file mode 100644
index 0000000..f04dbe2
--- /dev/null
+++ b/third_party/abseil/src/absl/time/civil_time_benchmark.cc
@@ -0,0 +1,127 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/time/civil_time.h"
+
+#include <numeric>
+#include <vector>
+
+#include "absl/hash/hash.h"
+#include "benchmark/benchmark.h"
+
+namespace {
+
+// Run on (12 X 3492 MHz CPUs); 2018-11-05T13:44:29.814239103-08:00
+// CPU: Intel Haswell with HyperThreading (6 cores) dL1:32KB dL2:256KB dL3:15MB
+// Benchmark Time(ns) CPU(ns) Iterations
+// ----------------------------------------------------------------
+// BM_Difference_Days 14.5 14.5 48531105
+// BM_Step_Days 12.6 12.6 54876006
+// BM_Format 587 587 1000000
+// BM_Parse 692 692 1000000
+// BM_RoundTripFormatParse 1309 1309 532075
+// BM_CivilYearAbslHash 0.710 0.710 976400000
+// BM_CivilMonthAbslHash 1.13 1.13 619500000
+// BM_CivilDayAbslHash 1.70 1.70 426000000
+// BM_CivilHourAbslHash 2.45 2.45 287600000
+// BM_CivilMinuteAbslHash 3.21 3.21 226200000
+// BM_CivilSecondAbslHash 4.10 4.10 171800000
+
+void BM_Difference_Days(benchmark::State& state) {
+ const absl::CivilDay c(2014, 8, 22);
+ const absl::CivilDay epoch(1970, 1, 1);
+ while (state.KeepRunning()) {
+ const absl::civil_diff_t n = c - epoch;
+ benchmark::DoNotOptimize(n);
+ }
+}
+BENCHMARK(BM_Difference_Days);
+
+void BM_Step_Days(benchmark::State& state) {
+ const absl::CivilDay kStart(2014, 8, 22);
+ absl::CivilDay c = kStart;
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(++c);
+ }
+}
+BENCHMARK(BM_Step_Days);
+
+void BM_Format(benchmark::State& state) {
+ const absl::CivilSecond c(2014, 1, 2, 3, 4, 5);
+ while (state.KeepRunning()) {
+ const std::string s = absl::FormatCivilTime(c);
+ benchmark::DoNotOptimize(s);
+ }
+}
+BENCHMARK(BM_Format);
+
+void BM_Parse(benchmark::State& state) {
+ const std::string f = "2014-01-02T03:04:05";
+ absl::CivilSecond c;
+ while (state.KeepRunning()) {
+ const bool b = absl::ParseCivilTime(f, &c);
+ benchmark::DoNotOptimize(b);
+ }
+}
+BENCHMARK(BM_Parse);
+
+void BM_RoundTripFormatParse(benchmark::State& state) {
+ const absl::CivilSecond c(2014, 1, 2, 3, 4, 5);
+ absl::CivilSecond out;
+ while (state.KeepRunning()) {
+ const bool b = absl::ParseCivilTime(absl::FormatCivilTime(c), &out);
+ benchmark::DoNotOptimize(b);
+ }
+}
+BENCHMARK(BM_RoundTripFormatParse);
+
+template <typename T>
+void BM_CivilTimeAbslHash(benchmark::State& state) {
+ const int kSize = 100000;
+ std::vector<T> civil_times(kSize);
+ std::iota(civil_times.begin(), civil_times.end(), T(2018));
+
+ absl::Hash<T> absl_hasher;
+ while (state.KeepRunningBatch(kSize)) {
+ for (const T civil_time : civil_times) {
+ benchmark::DoNotOptimize(absl_hasher(civil_time));
+ }
+ }
+}
+void BM_CivilYearAbslHash(benchmark::State& state) {
+ BM_CivilTimeAbslHash<absl::CivilYear>(state);
+}
+void BM_CivilMonthAbslHash(benchmark::State& state) {
+ BM_CivilTimeAbslHash<absl::CivilMonth>(state);
+}
+void BM_CivilDayAbslHash(benchmark::State& state) {
+ BM_CivilTimeAbslHash<absl::CivilDay>(state);
+}
+void BM_CivilHourAbslHash(benchmark::State& state) {
+ BM_CivilTimeAbslHash<absl::CivilHour>(state);
+}
+void BM_CivilMinuteAbslHash(benchmark::State& state) {
+ BM_CivilTimeAbslHash<absl::CivilMinute>(state);
+}
+void BM_CivilSecondAbslHash(benchmark::State& state) {
+ BM_CivilTimeAbslHash<absl::CivilSecond>(state);
+}
+BENCHMARK(BM_CivilYearAbslHash);
+BENCHMARK(BM_CivilMonthAbslHash);
+BENCHMARK(BM_CivilDayAbslHash);
+BENCHMARK(BM_CivilHourAbslHash);
+BENCHMARK(BM_CivilMinuteAbslHash);
+BENCHMARK(BM_CivilSecondAbslHash);
+
+} // namespace
diff --git a/third_party/abseil/src/absl/time/civil_time_test.cc b/third_party/abseil/src/absl/time/civil_time_test.cc
new file mode 100644
index 0000000..0ebd97a
--- /dev/null
+++ b/third_party/abseil/src/absl/time/civil_time_test.cc
@@ -0,0 +1,1243 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/time/civil_time.h"
+
+#include <limits>
+#include <sstream>
+#include <type_traits>
+
+#include "absl/base/macros.h"
+#include "gtest/gtest.h"
+
+namespace {
+
+TEST(CivilTime, DefaultConstruction) {
+ absl::CivilSecond ss;
+ EXPECT_EQ("1970-01-01T00:00:00", absl::FormatCivilTime(ss));
+
+ absl::CivilMinute mm;
+ EXPECT_EQ("1970-01-01T00:00", absl::FormatCivilTime(mm));
+
+ absl::CivilHour hh;
+ EXPECT_EQ("1970-01-01T00", absl::FormatCivilTime(hh));
+
+ absl::CivilDay d;
+ EXPECT_EQ("1970-01-01", absl::FormatCivilTime(d));
+
+ absl::CivilMonth m;
+ EXPECT_EQ("1970-01", absl::FormatCivilTime(m));
+
+ absl::CivilYear y;
+ EXPECT_EQ("1970", absl::FormatCivilTime(y));
+}
+
+TEST(CivilTime, StructMember) {
+ struct S {
+ absl::CivilDay day;
+ };
+ S s = {};
+ EXPECT_EQ(absl::CivilDay{}, s.day);
+}
+
+TEST(CivilTime, FieldsConstruction) {
+ EXPECT_EQ("2015-01-02T03:04:05",
+ absl::FormatCivilTime(absl::CivilSecond(2015, 1, 2, 3, 4, 5)));
+ EXPECT_EQ("2015-01-02T03:04:00",
+ absl::FormatCivilTime(absl::CivilSecond(2015, 1, 2, 3, 4)));
+ EXPECT_EQ("2015-01-02T03:00:00",
+ absl::FormatCivilTime(absl::CivilSecond(2015, 1, 2, 3)));
+ EXPECT_EQ("2015-01-02T00:00:00",
+ absl::FormatCivilTime(absl::CivilSecond(2015, 1, 2)));
+ EXPECT_EQ("2015-01-01T00:00:00",
+ absl::FormatCivilTime(absl::CivilSecond(2015, 1)));
+ EXPECT_EQ("2015-01-01T00:00:00",
+ absl::FormatCivilTime(absl::CivilSecond(2015)));
+
+ EXPECT_EQ("2015-01-02T03:04",
+ absl::FormatCivilTime(absl::CivilMinute(2015, 1, 2, 3, 4, 5)));
+ EXPECT_EQ("2015-01-02T03:04",
+ absl::FormatCivilTime(absl::CivilMinute(2015, 1, 2, 3, 4)));
+ EXPECT_EQ("2015-01-02T03:00",
+ absl::FormatCivilTime(absl::CivilMinute(2015, 1, 2, 3)));
+ EXPECT_EQ("2015-01-02T00:00",
+ absl::FormatCivilTime(absl::CivilMinute(2015, 1, 2)));
+ EXPECT_EQ("2015-01-01T00:00",
+ absl::FormatCivilTime(absl::CivilMinute(2015, 1)));
+ EXPECT_EQ("2015-01-01T00:00",
+ absl::FormatCivilTime(absl::CivilMinute(2015)));
+
+ EXPECT_EQ("2015-01-02T03",
+ absl::FormatCivilTime(absl::CivilHour(2015, 1, 2, 3, 4, 5)));
+ EXPECT_EQ("2015-01-02T03",
+ absl::FormatCivilTime(absl::CivilHour(2015, 1, 2, 3, 4)));
+ EXPECT_EQ("2015-01-02T03",
+ absl::FormatCivilTime(absl::CivilHour(2015, 1, 2, 3)));
+ EXPECT_EQ("2015-01-02T00",
+ absl::FormatCivilTime(absl::CivilHour(2015, 1, 2)));
+ EXPECT_EQ("2015-01-01T00",
+ absl::FormatCivilTime(absl::CivilHour(2015, 1)));
+ EXPECT_EQ("2015-01-01T00",
+ absl::FormatCivilTime(absl::CivilHour(2015)));
+
+ EXPECT_EQ("2015-01-02",
+ absl::FormatCivilTime(absl::CivilDay(2015, 1, 2, 3, 4, 5)));
+ EXPECT_EQ("2015-01-02",
+ absl::FormatCivilTime(absl::CivilDay(2015, 1, 2, 3, 4)));
+ EXPECT_EQ("2015-01-02",
+ absl::FormatCivilTime(absl::CivilDay(2015, 1, 2, 3)));
+ EXPECT_EQ("2015-01-02",
+ absl::FormatCivilTime(absl::CivilDay(2015, 1, 2)));
+ EXPECT_EQ("2015-01-01",
+ absl::FormatCivilTime(absl::CivilDay(2015, 1)));
+ EXPECT_EQ("2015-01-01",
+ absl::FormatCivilTime(absl::CivilDay(2015)));
+
+ EXPECT_EQ("2015-01",
+ absl::FormatCivilTime(absl::CivilMonth(2015, 1, 2, 3, 4, 5)));
+ EXPECT_EQ("2015-01",
+ absl::FormatCivilTime(absl::CivilMonth(2015, 1, 2, 3, 4)));
+ EXPECT_EQ("2015-01",
+ absl::FormatCivilTime(absl::CivilMonth(2015, 1, 2, 3)));
+ EXPECT_EQ("2015-01",
+ absl::FormatCivilTime(absl::CivilMonth(2015, 1, 2)));
+ EXPECT_EQ("2015-01",
+ absl::FormatCivilTime(absl::CivilMonth(2015, 1)));
+ EXPECT_EQ("2015-01",
+ absl::FormatCivilTime(absl::CivilMonth(2015)));
+
+ EXPECT_EQ("2015",
+ absl::FormatCivilTime(absl::CivilYear(2015, 1, 2, 3, 4, 5)));
+ EXPECT_EQ("2015",
+ absl::FormatCivilTime(absl::CivilYear(2015, 1, 2, 3, 4)));
+ EXPECT_EQ("2015",
+ absl::FormatCivilTime(absl::CivilYear(2015, 1, 2, 3)));
+ EXPECT_EQ("2015",
+ absl::FormatCivilTime(absl::CivilYear(2015, 1, 2)));
+ EXPECT_EQ("2015",
+ absl::FormatCivilTime(absl::CivilYear(2015, 1)));
+ EXPECT_EQ("2015",
+ absl::FormatCivilTime(absl::CivilYear(2015)));
+}
+
+TEST(CivilTime, FieldsConstructionLimits) {
+ const int kIntMax = std::numeric_limits<int>::max();
+ EXPECT_EQ("2038-01-19T03:14:07",
+ absl::FormatCivilTime(absl::CivilSecond(
+ 1970, 1, 1, 0, 0, kIntMax)));
+ EXPECT_EQ("6121-02-11T05:21:07",
+ absl::FormatCivilTime(absl::CivilSecond(
+ 1970, 1, 1, 0, kIntMax, kIntMax)));
+ EXPECT_EQ("251104-11-20T12:21:07",
+ absl::FormatCivilTime(absl::CivilSecond(
+ 1970, 1, 1, kIntMax, kIntMax, kIntMax)));
+ EXPECT_EQ("6130715-05-30T12:21:07",
+ absl::FormatCivilTime(absl::CivilSecond(
+ 1970, 1, kIntMax, kIntMax, kIntMax, kIntMax)));
+ EXPECT_EQ("185087685-11-26T12:21:07",
+ absl::FormatCivilTime(absl::CivilSecond(
+ 1970, kIntMax, kIntMax, kIntMax, kIntMax, kIntMax)));
+
+ const int kIntMin = std::numeric_limits<int>::min();
+ EXPECT_EQ("1901-12-13T20:45:52",
+ absl::FormatCivilTime(absl::CivilSecond(
+ 1970, 1, 1, 0, 0, kIntMin)));
+ EXPECT_EQ("-2182-11-20T18:37:52",
+ absl::FormatCivilTime(absl::CivilSecond(
+ 1970, 1, 1, 0, kIntMin, kIntMin)));
+ EXPECT_EQ("-247165-02-11T10:37:52",
+ absl::FormatCivilTime(absl::CivilSecond(
+ 1970, 1, 1, kIntMin, kIntMin, kIntMin)));
+ EXPECT_EQ("-6126776-08-01T10:37:52",
+ absl::FormatCivilTime(absl::CivilSecond(
+ 1970, 1, kIntMin, kIntMin, kIntMin, kIntMin)));
+ EXPECT_EQ("-185083747-10-31T10:37:52",
+ absl::FormatCivilTime(absl::CivilSecond(
+ 1970, kIntMin, kIntMin, kIntMin, kIntMin, kIntMin)));
+}
+
+TEST(CivilTime, RangeLimits) {
+ const absl::civil_year_t kYearMax =
+ std::numeric_limits<absl::civil_year_t>::max();
+ EXPECT_EQ(absl::CivilYear(kYearMax),
+ absl::CivilYear::max());
+ EXPECT_EQ(absl::CivilMonth(kYearMax, 12),
+ absl::CivilMonth::max());
+ EXPECT_EQ(absl::CivilDay(kYearMax, 12, 31),
+ absl::CivilDay::max());
+ EXPECT_EQ(absl::CivilHour(kYearMax, 12, 31, 23),
+ absl::CivilHour::max());
+ EXPECT_EQ(absl::CivilMinute(kYearMax, 12, 31, 23, 59),
+ absl::CivilMinute::max());
+ EXPECT_EQ(absl::CivilSecond(kYearMax, 12, 31, 23, 59, 59),
+ absl::CivilSecond::max());
+
+ const absl::civil_year_t kYearMin =
+ std::numeric_limits<absl::civil_year_t>::min();
+ EXPECT_EQ(absl::CivilYear(kYearMin),
+ absl::CivilYear::min());
+ EXPECT_EQ(absl::CivilMonth(kYearMin, 1),
+ absl::CivilMonth::min());
+ EXPECT_EQ(absl::CivilDay(kYearMin, 1, 1),
+ absl::CivilDay::min());
+ EXPECT_EQ(absl::CivilHour(kYearMin, 1, 1, 0),
+ absl::CivilHour::min());
+ EXPECT_EQ(absl::CivilMinute(kYearMin, 1, 1, 0, 0),
+ absl::CivilMinute::min());
+ EXPECT_EQ(absl::CivilSecond(kYearMin, 1, 1, 0, 0, 0),
+ absl::CivilSecond::min());
+}
+
+TEST(CivilTime, ImplicitCrossAlignment) {
+ absl::CivilYear year(2015);
+ absl::CivilMonth month = year;
+ absl::CivilDay day = month;
+ absl::CivilHour hour = day;
+ absl::CivilMinute minute = hour;
+ absl::CivilSecond second = minute;
+
+ second = year;
+ EXPECT_EQ(second, year);
+ second = month;
+ EXPECT_EQ(second, month);
+ second = day;
+ EXPECT_EQ(second, day);
+ second = hour;
+ EXPECT_EQ(second, hour);
+ second = minute;
+ EXPECT_EQ(second, minute);
+
+ minute = year;
+ EXPECT_EQ(minute, year);
+ minute = month;
+ EXPECT_EQ(minute, month);
+ minute = day;
+ EXPECT_EQ(minute, day);
+ minute = hour;
+ EXPECT_EQ(minute, hour);
+
+ hour = year;
+ EXPECT_EQ(hour, year);
+ hour = month;
+ EXPECT_EQ(hour, month);
+ hour = day;
+ EXPECT_EQ(hour, day);
+
+ day = year;
+ EXPECT_EQ(day, year);
+ day = month;
+ EXPECT_EQ(day, month);
+
+ month = year;
+ EXPECT_EQ(month, year);
+
+ // Ensures unsafe conversions are not allowed.
+ EXPECT_FALSE(
+ (std::is_convertible<absl::CivilSecond, absl::CivilMinute>::value));
+ EXPECT_FALSE(
+ (std::is_convertible<absl::CivilSecond, absl::CivilHour>::value));
+ EXPECT_FALSE(
+ (std::is_convertible<absl::CivilSecond, absl::CivilDay>::value));
+ EXPECT_FALSE(
+ (std::is_convertible<absl::CivilSecond, absl::CivilMonth>::value));
+ EXPECT_FALSE(
+ (std::is_convertible<absl::CivilSecond, absl::CivilYear>::value));
+
+ EXPECT_FALSE(
+ (std::is_convertible<absl::CivilMinute, absl::CivilHour>::value));
+ EXPECT_FALSE(
+ (std::is_convertible<absl::CivilMinute, absl::CivilDay>::value));
+ EXPECT_FALSE(
+ (std::is_convertible<absl::CivilMinute, absl::CivilMonth>::value));
+ EXPECT_FALSE(
+ (std::is_convertible<absl::CivilMinute, absl::CivilYear>::value));
+
+ EXPECT_FALSE(
+ (std::is_convertible<absl::CivilHour, absl::CivilDay>::value));
+ EXPECT_FALSE(
+ (std::is_convertible<absl::CivilHour, absl::CivilMonth>::value));
+ EXPECT_FALSE(
+ (std::is_convertible<absl::CivilHour, absl::CivilYear>::value));
+
+ EXPECT_FALSE(
+ (std::is_convertible<absl::CivilDay, absl::CivilMonth>::value));
+ EXPECT_FALSE(
+ (std::is_convertible<absl::CivilDay, absl::CivilYear>::value));
+
+ EXPECT_FALSE(
+ (std::is_convertible<absl::CivilMonth, absl::CivilYear>::value));
+}
+
+TEST(CivilTime, ExplicitCrossAlignment) {
+ //
+ // Assign from smaller units -> larger units
+ //
+
+ absl::CivilSecond second(2015, 1, 2, 3, 4, 5);
+ EXPECT_EQ("2015-01-02T03:04:05", absl::FormatCivilTime(second));
+
+ absl::CivilMinute minute(second);
+ EXPECT_EQ("2015-01-02T03:04", absl::FormatCivilTime(minute));
+
+ absl::CivilHour hour(minute);
+ EXPECT_EQ("2015-01-02T03", absl::FormatCivilTime(hour));
+
+ absl::CivilDay day(hour);
+ EXPECT_EQ("2015-01-02", absl::FormatCivilTime(day));
+
+ absl::CivilMonth month(day);
+ EXPECT_EQ("2015-01", absl::FormatCivilTime(month));
+
+ absl::CivilYear year(month);
+ EXPECT_EQ("2015", absl::FormatCivilTime(year));
+
+ //
+ // Now assign from larger units -> smaller units
+ //
+
+ month = absl::CivilMonth(year);
+ EXPECT_EQ("2015-01", absl::FormatCivilTime(month));
+
+ day = absl::CivilDay(month);
+ EXPECT_EQ("2015-01-01", absl::FormatCivilTime(day));
+
+ hour = absl::CivilHour(day);
+ EXPECT_EQ("2015-01-01T00", absl::FormatCivilTime(hour));
+
+ minute = absl::CivilMinute(hour);
+ EXPECT_EQ("2015-01-01T00:00", absl::FormatCivilTime(minute));
+
+ second = absl::CivilSecond(minute);
+ EXPECT_EQ("2015-01-01T00:00:00", absl::FormatCivilTime(second));
+}
+
+// Metafunction to test whether difference is allowed between two types.
+template <typename T1, typename T2>
+struct HasDiff {
+ template <typename U1, typename U2>
+ static std::false_type test(...);
+ template <typename U1, typename U2>
+ static std::true_type test(decltype(std::declval<U1>() - std::declval<U2>()));
+ static constexpr bool value = decltype(test<T1, T2>(0))::value;
+};
+
+TEST(CivilTime, DisallowCrossAlignedDifference) {
+ // Difference is allowed between types with the same alignment.
+ static_assert(HasDiff<absl::CivilSecond, absl::CivilSecond>::value, "");
+ static_assert(HasDiff<absl::CivilMinute, absl::CivilMinute>::value, "");
+ static_assert(HasDiff<absl::CivilHour, absl::CivilHour>::value, "");
+ static_assert(HasDiff<absl::CivilDay, absl::CivilDay>::value, "");
+ static_assert(HasDiff<absl::CivilMonth, absl::CivilMonth>::value, "");
+ static_assert(HasDiff<absl::CivilYear, absl::CivilYear>::value, "");
+
+ // Difference is disallowed between types with different alignments.
+ static_assert(!HasDiff<absl::CivilSecond, absl::CivilMinute>::value, "");
+ static_assert(!HasDiff<absl::CivilSecond, absl::CivilHour>::value, "");
+ static_assert(!HasDiff<absl::CivilSecond, absl::CivilDay>::value, "");
+ static_assert(!HasDiff<absl::CivilSecond, absl::CivilMonth>::value, "");
+ static_assert(!HasDiff<absl::CivilSecond, absl::CivilYear>::value, "");
+
+ static_assert(!HasDiff<absl::CivilMinute, absl::CivilHour>::value, "");
+ static_assert(!HasDiff<absl::CivilMinute, absl::CivilDay>::value, "");
+ static_assert(!HasDiff<absl::CivilMinute, absl::CivilMonth>::value, "");
+ static_assert(!HasDiff<absl::CivilMinute, absl::CivilYear>::value, "");
+
+ static_assert(!HasDiff<absl::CivilHour, absl::CivilDay>::value, "");
+ static_assert(!HasDiff<absl::CivilHour, absl::CivilMonth>::value, "");
+ static_assert(!HasDiff<absl::CivilHour, absl::CivilYear>::value, "");
+
+ static_assert(!HasDiff<absl::CivilDay, absl::CivilMonth>::value, "");
+ static_assert(!HasDiff<absl::CivilDay, absl::CivilYear>::value, "");
+
+ static_assert(!HasDiff<absl::CivilMonth, absl::CivilYear>::value, "");
+}
+
+TEST(CivilTime, ValueSemantics) {
+ const absl::CivilHour a(2015, 1, 2, 3);
+ const absl::CivilHour b = a;
+ const absl::CivilHour c(b);
+ absl::CivilHour d;
+ d = c;
+ EXPECT_EQ("2015-01-02T03", absl::FormatCivilTime(d));
+}
+
+TEST(CivilTime, Relational) {
+ // Tests that the alignment unit is ignored in comparison.
+ const absl::CivilYear year(2014);
+ const absl::CivilMonth month(year);
+ EXPECT_EQ(year, month);
+
+#define TEST_RELATIONAL(OLDER, YOUNGER) \
+ do { \
+ EXPECT_FALSE(OLDER < OLDER); \
+ EXPECT_FALSE(OLDER > OLDER); \
+ EXPECT_TRUE(OLDER >= OLDER); \
+ EXPECT_TRUE(OLDER <= OLDER); \
+ EXPECT_FALSE(YOUNGER < YOUNGER); \
+ EXPECT_FALSE(YOUNGER > YOUNGER); \
+ EXPECT_TRUE(YOUNGER >= YOUNGER); \
+ EXPECT_TRUE(YOUNGER <= YOUNGER); \
+ EXPECT_EQ(OLDER, OLDER); \
+ EXPECT_NE(OLDER, YOUNGER); \
+ EXPECT_LT(OLDER, YOUNGER); \
+ EXPECT_LE(OLDER, YOUNGER); \
+ EXPECT_GT(YOUNGER, OLDER); \
+ EXPECT_GE(YOUNGER, OLDER); \
+ } while (0)
+
+ // Alignment is ignored in comparison (verified above), so CivilSecond is
+ // used to test comparison in all field positions.
+ TEST_RELATIONAL(absl::CivilSecond(2014, 1, 1, 0, 0, 0),
+ absl::CivilSecond(2015, 1, 1, 0, 0, 0));
+ TEST_RELATIONAL(absl::CivilSecond(2014, 1, 1, 0, 0, 0),
+ absl::CivilSecond(2014, 2, 1, 0, 0, 0));
+ TEST_RELATIONAL(absl::CivilSecond(2014, 1, 1, 0, 0, 0),
+ absl::CivilSecond(2014, 1, 2, 0, 0, 0));
+ TEST_RELATIONAL(absl::CivilSecond(2014, 1, 1, 0, 0, 0),
+ absl::CivilSecond(2014, 1, 1, 1, 0, 0));
+ TEST_RELATIONAL(absl::CivilSecond(2014, 1, 1, 1, 0, 0),
+ absl::CivilSecond(2014, 1, 1, 1, 1, 0));
+ TEST_RELATIONAL(absl::CivilSecond(2014, 1, 1, 1, 1, 0),
+ absl::CivilSecond(2014, 1, 1, 1, 1, 1));
+
+ // Tests the relational operators of two different civil-time types.
+ TEST_RELATIONAL(absl::CivilDay(2014, 1, 1),
+ absl::CivilMinute(2014, 1, 1, 1, 1));
+ TEST_RELATIONAL(absl::CivilDay(2014, 1, 1),
+ absl::CivilMonth(2014, 2));
+
+#undef TEST_RELATIONAL
+}
+
+TEST(CivilTime, Arithmetic) {
+ absl::CivilSecond second(2015, 1, 2, 3, 4, 5);
+ EXPECT_EQ("2015-01-02T03:04:06", absl::FormatCivilTime(second += 1));
+ EXPECT_EQ("2015-01-02T03:04:07", absl::FormatCivilTime(second + 1));
+ EXPECT_EQ("2015-01-02T03:04:08", absl::FormatCivilTime(2 + second));
+ EXPECT_EQ("2015-01-02T03:04:05", absl::FormatCivilTime(second - 1));
+ EXPECT_EQ("2015-01-02T03:04:05", absl::FormatCivilTime(second -= 1));
+ EXPECT_EQ("2015-01-02T03:04:05", absl::FormatCivilTime(second++));
+ EXPECT_EQ("2015-01-02T03:04:07", absl::FormatCivilTime(++second));
+ EXPECT_EQ("2015-01-02T03:04:07", absl::FormatCivilTime(second--));
+ EXPECT_EQ("2015-01-02T03:04:05", absl::FormatCivilTime(--second));
+
+ absl::CivilMinute minute(2015, 1, 2, 3, 4);
+ EXPECT_EQ("2015-01-02T03:05", absl::FormatCivilTime(minute += 1));
+ EXPECT_EQ("2015-01-02T03:06", absl::FormatCivilTime(minute + 1));
+ EXPECT_EQ("2015-01-02T03:07", absl::FormatCivilTime(2 + minute));
+ EXPECT_EQ("2015-01-02T03:04", absl::FormatCivilTime(minute - 1));
+ EXPECT_EQ("2015-01-02T03:04", absl::FormatCivilTime(minute -= 1));
+ EXPECT_EQ("2015-01-02T03:04", absl::FormatCivilTime(minute++));
+ EXPECT_EQ("2015-01-02T03:06", absl::FormatCivilTime(++minute));
+ EXPECT_EQ("2015-01-02T03:06", absl::FormatCivilTime(minute--));
+ EXPECT_EQ("2015-01-02T03:04", absl::FormatCivilTime(--minute));
+
+ absl::CivilHour hour(2015, 1, 2, 3);
+ EXPECT_EQ("2015-01-02T04", absl::FormatCivilTime(hour += 1));
+ EXPECT_EQ("2015-01-02T05", absl::FormatCivilTime(hour + 1));
+ EXPECT_EQ("2015-01-02T06", absl::FormatCivilTime(2 + hour));
+ EXPECT_EQ("2015-01-02T03", absl::FormatCivilTime(hour - 1));
+ EXPECT_EQ("2015-01-02T03", absl::FormatCivilTime(hour -= 1));
+ EXPECT_EQ("2015-01-02T03", absl::FormatCivilTime(hour++));
+ EXPECT_EQ("2015-01-02T05", absl::FormatCivilTime(++hour));
+ EXPECT_EQ("2015-01-02T05", absl::FormatCivilTime(hour--));
+ EXPECT_EQ("2015-01-02T03", absl::FormatCivilTime(--hour));
+
+ absl::CivilDay day(2015, 1, 2);
+ EXPECT_EQ("2015-01-03", absl::FormatCivilTime(day += 1));
+ EXPECT_EQ("2015-01-04", absl::FormatCivilTime(day + 1));
+ EXPECT_EQ("2015-01-05", absl::FormatCivilTime(2 + day));
+ EXPECT_EQ("2015-01-02", absl::FormatCivilTime(day - 1));
+ EXPECT_EQ("2015-01-02", absl::FormatCivilTime(day -= 1));
+ EXPECT_EQ("2015-01-02", absl::FormatCivilTime(day++));
+ EXPECT_EQ("2015-01-04", absl::FormatCivilTime(++day));
+ EXPECT_EQ("2015-01-04", absl::FormatCivilTime(day--));
+ EXPECT_EQ("2015-01-02", absl::FormatCivilTime(--day));
+
+ absl::CivilMonth month(2015, 1);
+ EXPECT_EQ("2015-02", absl::FormatCivilTime(month += 1));
+ EXPECT_EQ("2015-03", absl::FormatCivilTime(month + 1));
+ EXPECT_EQ("2015-04", absl::FormatCivilTime(2 + month));
+ EXPECT_EQ("2015-01", absl::FormatCivilTime(month - 1));
+ EXPECT_EQ("2015-01", absl::FormatCivilTime(month -= 1));
+ EXPECT_EQ("2015-01", absl::FormatCivilTime(month++));
+ EXPECT_EQ("2015-03", absl::FormatCivilTime(++month));
+ EXPECT_EQ("2015-03", absl::FormatCivilTime(month--));
+ EXPECT_EQ("2015-01", absl::FormatCivilTime(--month));
+
+ absl::CivilYear year(2015);
+ EXPECT_EQ("2016", absl::FormatCivilTime(year += 1));
+ EXPECT_EQ("2017", absl::FormatCivilTime(year + 1));
+ EXPECT_EQ("2018", absl::FormatCivilTime(2 + year));
+ EXPECT_EQ("2015", absl::FormatCivilTime(year - 1));
+ EXPECT_EQ("2015", absl::FormatCivilTime(year -= 1));
+ EXPECT_EQ("2015", absl::FormatCivilTime(year++));
+ EXPECT_EQ("2017", absl::FormatCivilTime(++year));
+ EXPECT_EQ("2017", absl::FormatCivilTime(year--));
+ EXPECT_EQ("2015", absl::FormatCivilTime(--year));
+}
+
+TEST(CivilTime, ArithmeticLimits) {
+ const int kIntMax = std::numeric_limits<int>::max();
+ const int kIntMin = std::numeric_limits<int>::min();
+
+ absl::CivilSecond second(1970, 1, 1, 0, 0, 0);
+ second += kIntMax;
+ EXPECT_EQ("2038-01-19T03:14:07", absl::FormatCivilTime(second));
+ second -= kIntMax;
+ EXPECT_EQ("1970-01-01T00:00:00", absl::FormatCivilTime(second));
+ second += kIntMin;
+ EXPECT_EQ("1901-12-13T20:45:52", absl::FormatCivilTime(second));
+ second -= kIntMin;
+ EXPECT_EQ("1970-01-01T00:00:00", absl::FormatCivilTime(second));
+
+ absl::CivilMinute minute(1970, 1, 1, 0, 0);
+ minute += kIntMax;
+ EXPECT_EQ("6053-01-23T02:07", absl::FormatCivilTime(minute));
+ minute -= kIntMax;
+ EXPECT_EQ("1970-01-01T00:00", absl::FormatCivilTime(minute));
+ minute += kIntMin;
+ EXPECT_EQ("-2114-12-08T21:52", absl::FormatCivilTime(minute));
+ minute -= kIntMin;
+ EXPECT_EQ("1970-01-01T00:00", absl::FormatCivilTime(minute));
+
+ absl::CivilHour hour(1970, 1, 1, 0);
+ hour += kIntMax;
+ EXPECT_EQ("246953-10-09T07", absl::FormatCivilTime(hour));
+ hour -= kIntMax;
+ EXPECT_EQ("1970-01-01T00", absl::FormatCivilTime(hour));
+ hour += kIntMin;
+ EXPECT_EQ("-243014-03-24T16", absl::FormatCivilTime(hour));
+ hour -= kIntMin;
+ EXPECT_EQ("1970-01-01T00", absl::FormatCivilTime(hour));
+
+ absl::CivilDay day(1970, 1, 1);
+ day += kIntMax;
+ EXPECT_EQ("5881580-07-11", absl::FormatCivilTime(day));
+ day -= kIntMax;
+ EXPECT_EQ("1970-01-01", absl::FormatCivilTime(day));
+ day += kIntMin;
+ EXPECT_EQ("-5877641-06-23", absl::FormatCivilTime(day));
+ day -= kIntMin;
+ EXPECT_EQ("1970-01-01", absl::FormatCivilTime(day));
+
+ absl::CivilMonth month(1970, 1);
+ month += kIntMax;
+ EXPECT_EQ("178958940-08", absl::FormatCivilTime(month));
+ month -= kIntMax;
+ EXPECT_EQ("1970-01", absl::FormatCivilTime(month));
+ month += kIntMin;
+ EXPECT_EQ("-178955001-05", absl::FormatCivilTime(month));
+ month -= kIntMin;
+ EXPECT_EQ("1970-01", absl::FormatCivilTime(month));
+
+ absl::CivilYear year(0);
+ year += kIntMax;
+ EXPECT_EQ("2147483647", absl::FormatCivilTime(year));
+ year -= kIntMax;
+ EXPECT_EQ("0", absl::FormatCivilTime(year));
+ year += kIntMin;
+ EXPECT_EQ("-2147483648", absl::FormatCivilTime(year));
+ year -= kIntMin;
+ EXPECT_EQ("0", absl::FormatCivilTime(year));
+}
+
+TEST(CivilTime, Difference) {
+ absl::CivilSecond second(2015, 1, 2, 3, 4, 5);
+ EXPECT_EQ(0, second - second);
+ EXPECT_EQ(10, (second + 10) - second);
+ EXPECT_EQ(-10, (second - 10) - second);
+
+ absl::CivilMinute minute(2015, 1, 2, 3, 4);
+ EXPECT_EQ(0, minute - minute);
+ EXPECT_EQ(10, (minute + 10) - minute);
+ EXPECT_EQ(-10, (minute - 10) - minute);
+
+ absl::CivilHour hour(2015, 1, 2, 3);
+ EXPECT_EQ(0, hour - hour);
+ EXPECT_EQ(10, (hour + 10) - hour);
+ EXPECT_EQ(-10, (hour - 10) - hour);
+
+ absl::CivilDay day(2015, 1, 2);
+ EXPECT_EQ(0, day - day);
+ EXPECT_EQ(10, (day + 10) - day);
+ EXPECT_EQ(-10, (day - 10) - day);
+
+ absl::CivilMonth month(2015, 1);
+ EXPECT_EQ(0, month - month);
+ EXPECT_EQ(10, (month + 10) - month);
+ EXPECT_EQ(-10, (month - 10) - month);
+
+ absl::CivilYear year(2015);
+ EXPECT_EQ(0, year - year);
+ EXPECT_EQ(10, (year + 10) - year);
+ EXPECT_EQ(-10, (year - 10) - year);
+}
+
+TEST(CivilTime, DifferenceLimits) {
+ const absl::civil_diff_t kDiffMax =
+ std::numeric_limits<absl::civil_diff_t>::max();
+ const absl::civil_diff_t kDiffMin =
+ std::numeric_limits<absl::civil_diff_t>::min();
+
+ // Check day arithmetic at the end of the year range.
+ const absl::CivilDay max_day(kDiffMax, 12, 31);
+ EXPECT_EQ(1, max_day - (max_day - 1));
+ EXPECT_EQ(-1, (max_day - 1) - max_day);
+
+ // Check day arithmetic at the start of the year range.
+ const absl::CivilDay min_day(kDiffMin, 1, 1);
+ EXPECT_EQ(1, (min_day + 1) - min_day);
+ EXPECT_EQ(-1, min_day - (min_day + 1));
+
+ // Check the limits of the return value.
+ const absl::CivilDay d1(1970, 1, 1);
+ const absl::CivilDay d2(25252734927768524, 7, 27);
+ EXPECT_EQ(kDiffMax, d2 - d1);
+ EXPECT_EQ(kDiffMin, d1 - (d2 + 1));
+}
+
+TEST(CivilTime, Properties) {
+ absl::CivilSecond ss(2015, 2, 3, 4, 5, 6);
+ EXPECT_EQ(2015, ss.year());
+ EXPECT_EQ(2, ss.month());
+ EXPECT_EQ(3, ss.day());
+ EXPECT_EQ(4, ss.hour());
+ EXPECT_EQ(5, ss.minute());
+ EXPECT_EQ(6, ss.second());
+ EXPECT_EQ(absl::Weekday::tuesday, absl::GetWeekday(ss));
+ EXPECT_EQ(34, absl::GetYearDay(ss));
+
+ absl::CivilMinute mm(2015, 2, 3, 4, 5, 6);
+ EXPECT_EQ(2015, mm.year());
+ EXPECT_EQ(2, mm.month());
+ EXPECT_EQ(3, mm.day());
+ EXPECT_EQ(4, mm.hour());
+ EXPECT_EQ(5, mm.minute());
+ EXPECT_EQ(0, mm.second());
+ EXPECT_EQ(absl::Weekday::tuesday, absl::GetWeekday(mm));
+ EXPECT_EQ(34, absl::GetYearDay(mm));
+
+ absl::CivilHour hh(2015, 2, 3, 4, 5, 6);
+ EXPECT_EQ(2015, hh.year());
+ EXPECT_EQ(2, hh.month());
+ EXPECT_EQ(3, hh.day());
+ EXPECT_EQ(4, hh.hour());
+ EXPECT_EQ(0, hh.minute());
+ EXPECT_EQ(0, hh.second());
+ EXPECT_EQ(absl::Weekday::tuesday, absl::GetWeekday(hh));
+ EXPECT_EQ(34, absl::GetYearDay(hh));
+
+ absl::CivilDay d(2015, 2, 3, 4, 5, 6);
+ EXPECT_EQ(2015, d.year());
+ EXPECT_EQ(2, d.month());
+ EXPECT_EQ(3, d.day());
+ EXPECT_EQ(0, d.hour());
+ EXPECT_EQ(0, d.minute());
+ EXPECT_EQ(0, d.second());
+ EXPECT_EQ(absl::Weekday::tuesday, absl::GetWeekday(d));
+ EXPECT_EQ(34, absl::GetYearDay(d));
+
+ absl::CivilMonth m(2015, 2, 3, 4, 5, 6);
+ EXPECT_EQ(2015, m.year());
+ EXPECT_EQ(2, m.month());
+ EXPECT_EQ(1, m.day());
+ EXPECT_EQ(0, m.hour());
+ EXPECT_EQ(0, m.minute());
+ EXPECT_EQ(0, m.second());
+ EXPECT_EQ(absl::Weekday::sunday, absl::GetWeekday(m));
+ EXPECT_EQ(32, absl::GetYearDay(m));
+
+ absl::CivilYear y(2015, 2, 3, 4, 5, 6);
+ EXPECT_EQ(2015, y.year());
+ EXPECT_EQ(1, y.month());
+ EXPECT_EQ(1, y.day());
+ EXPECT_EQ(0, y.hour());
+ EXPECT_EQ(0, y.minute());
+ EXPECT_EQ(0, y.second());
+ EXPECT_EQ(absl::Weekday::thursday, absl::GetWeekday(y));
+ EXPECT_EQ(1, absl::GetYearDay(y));
+}
+
+TEST(CivilTime, Format) {
+ absl::CivilSecond ss;
+ EXPECT_EQ("1970-01-01T00:00:00", absl::FormatCivilTime(ss));
+
+ absl::CivilMinute mm;
+ EXPECT_EQ("1970-01-01T00:00", absl::FormatCivilTime(mm));
+
+ absl::CivilHour hh;
+ EXPECT_EQ("1970-01-01T00", absl::FormatCivilTime(hh));
+
+ absl::CivilDay d;
+ EXPECT_EQ("1970-01-01", absl::FormatCivilTime(d));
+
+ absl::CivilMonth m;
+ EXPECT_EQ("1970-01", absl::FormatCivilTime(m));
+
+ absl::CivilYear y;
+ EXPECT_EQ("1970", absl::FormatCivilTime(y));
+}
+
+TEST(CivilTime, Parse) {
+ absl::CivilSecond ss;
+ absl::CivilMinute mm;
+ absl::CivilHour hh;
+ absl::CivilDay d;
+ absl::CivilMonth m;
+ absl::CivilYear y;
+
+ // CivilSecond OK; others fail
+ EXPECT_TRUE(absl::ParseCivilTime("2015-01-02T03:04:05", &ss));
+ EXPECT_EQ("2015-01-02T03:04:05", absl::FormatCivilTime(ss));
+ EXPECT_FALSE(absl::ParseCivilTime("2015-01-02T03:04:05", &mm));
+ EXPECT_FALSE(absl::ParseCivilTime("2015-01-02T03:04:05", &hh));
+ EXPECT_FALSE(absl::ParseCivilTime("2015-01-02T03:04:05", &d));
+ EXPECT_FALSE(absl::ParseCivilTime("2015-01-02T03:04:05", &m));
+ EXPECT_FALSE(absl::ParseCivilTime("2015-01-02T03:04:05", &y));
+
+ // CivilMinute OK; others fail
+ EXPECT_FALSE(absl::ParseCivilTime("2015-01-02T03:04", &ss));
+ EXPECT_TRUE(absl::ParseCivilTime("2015-01-02T03:04", &mm));
+ EXPECT_EQ("2015-01-02T03:04", absl::FormatCivilTime(mm));
+ EXPECT_FALSE(absl::ParseCivilTime("2015-01-02T03:04", &hh));
+ EXPECT_FALSE(absl::ParseCivilTime("2015-01-02T03:04", &d));
+ EXPECT_FALSE(absl::ParseCivilTime("2015-01-02T03:04", &m));
+ EXPECT_FALSE(absl::ParseCivilTime("2015-01-02T03:04", &y));
+
+ // CivilHour OK; others fail
+ EXPECT_FALSE(absl::ParseCivilTime("2015-01-02T03", &ss));
+ EXPECT_FALSE(absl::ParseCivilTime("2015-01-02T03", &mm));
+ EXPECT_TRUE(absl::ParseCivilTime("2015-01-02T03", &hh));
+ EXPECT_EQ("2015-01-02T03", absl::FormatCivilTime(hh));
+ EXPECT_FALSE(absl::ParseCivilTime("2015-01-02T03", &d));
+ EXPECT_FALSE(absl::ParseCivilTime("2015-01-02T03", &m));
+ EXPECT_FALSE(absl::ParseCivilTime("2015-01-02T03", &y));
+
+ // CivilDay OK; others fail
+ EXPECT_FALSE(absl::ParseCivilTime("2015-01-02", &ss));
+ EXPECT_FALSE(absl::ParseCivilTime("2015-01-02", &mm));
+ EXPECT_FALSE(absl::ParseCivilTime("2015-01-02", &hh));
+ EXPECT_TRUE(absl::ParseCivilTime("2015-01-02", &d));
+ EXPECT_EQ("2015-01-02", absl::FormatCivilTime(d));
+ EXPECT_FALSE(absl::ParseCivilTime("2015-01-02", &m));
+ EXPECT_FALSE(absl::ParseCivilTime("2015-01-02", &y));
+
+ // CivilMonth OK; others fail
+ EXPECT_FALSE(absl::ParseCivilTime("2015-01", &ss));
+ EXPECT_FALSE(absl::ParseCivilTime("2015-01", &mm));
+ EXPECT_FALSE(absl::ParseCivilTime("2015-01", &hh));
+ EXPECT_FALSE(absl::ParseCivilTime("2015-01", &d));
+ EXPECT_TRUE(absl::ParseCivilTime("2015-01", &m));
+ EXPECT_EQ("2015-01", absl::FormatCivilTime(m));
+ EXPECT_FALSE(absl::ParseCivilTime("2015-01", &y));
+
+ // CivilYear OK; others fail
+ EXPECT_FALSE(absl::ParseCivilTime("2015", &ss));
+ EXPECT_FALSE(absl::ParseCivilTime("2015", &mm));
+ EXPECT_FALSE(absl::ParseCivilTime("2015", &hh));
+ EXPECT_FALSE(absl::ParseCivilTime("2015", &d));
+ EXPECT_FALSE(absl::ParseCivilTime("2015", &m));
+ EXPECT_TRUE(absl::ParseCivilTime("2015", &y));
+ EXPECT_EQ("2015", absl::FormatCivilTime(y));
+}
+
+TEST(CivilTime, FormatAndParseLenient) {
+ absl::CivilSecond ss;
+ EXPECT_EQ("1970-01-01T00:00:00", absl::FormatCivilTime(ss));
+
+ absl::CivilMinute mm;
+ EXPECT_EQ("1970-01-01T00:00", absl::FormatCivilTime(mm));
+
+ absl::CivilHour hh;
+ EXPECT_EQ("1970-01-01T00", absl::FormatCivilTime(hh));
+
+ absl::CivilDay d;
+ EXPECT_EQ("1970-01-01", absl::FormatCivilTime(d));
+
+ absl::CivilMonth m;
+ EXPECT_EQ("1970-01", absl::FormatCivilTime(m));
+
+ absl::CivilYear y;
+ EXPECT_EQ("1970", absl::FormatCivilTime(y));
+
+ EXPECT_TRUE(absl::ParseLenientCivilTime("2015-01-02T03:04:05", &ss));
+ EXPECT_EQ("2015-01-02T03:04:05", absl::FormatCivilTime(ss));
+
+ EXPECT_TRUE(absl::ParseLenientCivilTime("2015-01-02T03:04:05", &mm));
+ EXPECT_EQ("2015-01-02T03:04", absl::FormatCivilTime(mm));
+
+ EXPECT_TRUE(absl::ParseLenientCivilTime("2015-01-02T03:04:05", &hh));
+ EXPECT_EQ("2015-01-02T03", absl::FormatCivilTime(hh));
+
+ EXPECT_TRUE(absl::ParseLenientCivilTime("2015-01-02T03:04:05", &d));
+ EXPECT_EQ("2015-01-02", absl::FormatCivilTime(d));
+
+ EXPECT_TRUE(absl::ParseLenientCivilTime("2015-01-02T03:04:05", &m));
+ EXPECT_EQ("2015-01", absl::FormatCivilTime(m));
+
+ EXPECT_TRUE(absl::ParseLenientCivilTime("2015-01-02T03:04:05", &y));
+ EXPECT_EQ("2015", absl::FormatCivilTime(y));
+}
+
+TEST(CivilTime, ParseEdgeCases) {
+ absl::CivilSecond ss;
+ EXPECT_TRUE(
+ absl::ParseLenientCivilTime("9223372036854775807-12-31T23:59:59", &ss));
+ EXPECT_EQ("9223372036854775807-12-31T23:59:59", absl::FormatCivilTime(ss));
+ EXPECT_TRUE(
+ absl::ParseLenientCivilTime("-9223372036854775808-01-01T00:00:00", &ss));
+ EXPECT_EQ("-9223372036854775808-01-01T00:00:00", absl::FormatCivilTime(ss));
+
+ absl::CivilMinute mm;
+ EXPECT_TRUE(
+ absl::ParseLenientCivilTime("9223372036854775807-12-31T23:59", &mm));
+ EXPECT_EQ("9223372036854775807-12-31T23:59", absl::FormatCivilTime(mm));
+ EXPECT_TRUE(
+ absl::ParseLenientCivilTime("-9223372036854775808-01-01T00:00", &mm));
+ EXPECT_EQ("-9223372036854775808-01-01T00:00", absl::FormatCivilTime(mm));
+
+ absl::CivilHour hh;
+ EXPECT_TRUE(
+ absl::ParseLenientCivilTime("9223372036854775807-12-31T23", &hh));
+ EXPECT_EQ("9223372036854775807-12-31T23", absl::FormatCivilTime(hh));
+ EXPECT_TRUE(
+ absl::ParseLenientCivilTime("-9223372036854775808-01-01T00", &hh));
+ EXPECT_EQ("-9223372036854775808-01-01T00", absl::FormatCivilTime(hh));
+
+ absl::CivilDay d;
+ EXPECT_TRUE(absl::ParseLenientCivilTime("9223372036854775807-12-31", &d));
+ EXPECT_EQ("9223372036854775807-12-31", absl::FormatCivilTime(d));
+ EXPECT_TRUE(absl::ParseLenientCivilTime("-9223372036854775808-01-01", &d));
+ EXPECT_EQ("-9223372036854775808-01-01", absl::FormatCivilTime(d));
+
+ absl::CivilMonth m;
+ EXPECT_TRUE(absl::ParseLenientCivilTime("9223372036854775807-12", &m));
+ EXPECT_EQ("9223372036854775807-12", absl::FormatCivilTime(m));
+ EXPECT_TRUE(absl::ParseLenientCivilTime("-9223372036854775808-01", &m));
+ EXPECT_EQ("-9223372036854775808-01", absl::FormatCivilTime(m));
+
+ absl::CivilYear y;
+ EXPECT_TRUE(absl::ParseLenientCivilTime("9223372036854775807", &y));
+ EXPECT_EQ("9223372036854775807", absl::FormatCivilTime(y));
+ EXPECT_TRUE(absl::ParseLenientCivilTime("-9223372036854775808", &y));
+ EXPECT_EQ("-9223372036854775808", absl::FormatCivilTime(y));
+
+ // Tests some valid, but interesting, cases
+ EXPECT_TRUE(absl::ParseLenientCivilTime("0", &ss)) << ss;
+ EXPECT_EQ(absl::CivilYear(0), ss);
+ EXPECT_TRUE(absl::ParseLenientCivilTime("0-1", &ss)) << ss;
+ EXPECT_EQ(absl::CivilMonth(0, 1), ss);
+ EXPECT_TRUE(absl::ParseLenientCivilTime(" 2015 ", &ss)) << ss;
+ EXPECT_EQ(absl::CivilYear(2015), ss);
+ EXPECT_TRUE(absl::ParseLenientCivilTime(" 2015-6 ", &ss)) << ss;
+ EXPECT_EQ(absl::CivilMonth(2015, 6), ss);
+ EXPECT_TRUE(absl::ParseLenientCivilTime("2015-6-7", &ss)) << ss;
+ EXPECT_EQ(absl::CivilDay(2015, 6, 7), ss);
+ EXPECT_TRUE(absl::ParseLenientCivilTime(" 2015-6-7 ", &ss)) << ss;
+ EXPECT_EQ(absl::CivilDay(2015, 6, 7), ss);
+ EXPECT_TRUE(absl::ParseLenientCivilTime("2015-06-07T10:11:12 ", &ss)) << ss;
+ EXPECT_EQ(absl::CivilSecond(2015, 6, 7, 10, 11, 12), ss);
+ EXPECT_TRUE(absl::ParseLenientCivilTime(" 2015-06-07T10:11:12 ", &ss)) << ss;
+ EXPECT_EQ(absl::CivilSecond(2015, 6, 7, 10, 11, 12), ss);
+ EXPECT_TRUE(absl::ParseLenientCivilTime("-01-01", &ss)) << ss;
+ EXPECT_EQ(absl::CivilMonth(-1, 1), ss);
+
+ // Tests some invalid cases
+ EXPECT_FALSE(absl::ParseLenientCivilTime("01-01-2015", &ss)) << ss;
+ EXPECT_FALSE(absl::ParseLenientCivilTime("2015-", &ss)) << ss;
+ EXPECT_FALSE(absl::ParseLenientCivilTime("0xff-01", &ss)) << ss;
+ EXPECT_FALSE(absl::ParseLenientCivilTime("2015-02-30T04:05:06", &ss)) << ss;
+ EXPECT_FALSE(absl::ParseLenientCivilTime("2015-02-03T04:05:96", &ss)) << ss;
+ EXPECT_FALSE(absl::ParseLenientCivilTime("X2015-02-03T04:05:06", &ss)) << ss;
+ EXPECT_FALSE(absl::ParseLenientCivilTime("2015-02-03T04:05:003", &ss)) << ss;
+ EXPECT_FALSE(absl::ParseLenientCivilTime("2015 -02-03T04:05:06", &ss)) << ss;
+ EXPECT_FALSE(absl::ParseLenientCivilTime("2015-02-03-04:05:06", &ss)) << ss;
+ EXPECT_FALSE(absl::ParseLenientCivilTime("2015:02:03T04-05-06", &ss)) << ss;
+ EXPECT_FALSE(absl::ParseLenientCivilTime("9223372036854775808", &y)) << y;
+}
+
+TEST(CivilTime, OutputStream) {
+ absl::CivilSecond cs(2016, 2, 3, 4, 5, 6);
+ {
+ std::stringstream ss;
+ ss << std::left << std::setfill('.');
+ ss << std::setw(3) << 'X';
+ ss << std::setw(21) << absl::CivilYear(cs);
+ ss << std::setw(3) << 'X';
+ EXPECT_EQ("X..2016.................X..", ss.str());
+ }
+ {
+ std::stringstream ss;
+ ss << std::left << std::setfill('.');
+ ss << std::setw(3) << 'X';
+ ss << std::setw(21) << absl::CivilMonth(cs);
+ ss << std::setw(3) << 'X';
+ EXPECT_EQ("X..2016-02..............X..", ss.str());
+ }
+ {
+ std::stringstream ss;
+ ss << std::left << std::setfill('.');
+ ss << std::setw(3) << 'X';
+ ss << std::setw(21) << absl::CivilDay(cs);
+ ss << std::setw(3) << 'X';
+ EXPECT_EQ("X..2016-02-03...........X..", ss.str());
+ }
+ {
+ std::stringstream ss;
+ ss << std::left << std::setfill('.');
+ ss << std::setw(3) << 'X';
+ ss << std::setw(21) << absl::CivilHour(cs);
+ ss << std::setw(3) << 'X';
+ EXPECT_EQ("X..2016-02-03T04........X..", ss.str());
+ }
+ {
+ std::stringstream ss;
+ ss << std::left << std::setfill('.');
+ ss << std::setw(3) << 'X';
+ ss << std::setw(21) << absl::CivilMinute(cs);
+ ss << std::setw(3) << 'X';
+ EXPECT_EQ("X..2016-02-03T04:05.....X..", ss.str());
+ }
+ {
+ std::stringstream ss;
+ ss << std::left << std::setfill('.');
+ ss << std::setw(3) << 'X';
+ ss << std::setw(21) << absl::CivilSecond(cs);
+ ss << std::setw(3) << 'X';
+ EXPECT_EQ("X..2016-02-03T04:05:06..X..", ss.str());
+ }
+ {
+ std::stringstream ss;
+ ss << std::left << std::setfill('.');
+ ss << std::setw(3) << 'X';
+ ss << std::setw(21) << absl::Weekday::wednesday;
+ ss << std::setw(3) << 'X';
+ EXPECT_EQ("X..Wednesday............X..", ss.str());
+ }
+}
+
+TEST(CivilTime, Weekday) {
+ absl::CivilDay d(1970, 1, 1);
+ EXPECT_EQ(absl::Weekday::thursday, absl::GetWeekday(d)) << d;
+
+ // We used to get this wrong for years < -30.
+ d = absl::CivilDay(-31, 12, 24);
+ EXPECT_EQ(absl::Weekday::wednesday, absl::GetWeekday(d)) << d;
+}
+
+TEST(CivilTime, NextPrevWeekday) {
+ // Jan 1, 1970 was a Thursday.
+ const absl::CivilDay thursday(1970, 1, 1);
+
+ // Thursday -> Thursday
+ absl::CivilDay d = absl::NextWeekday(thursday, absl::Weekday::thursday);
+ EXPECT_EQ(7, d - thursday) << d;
+ EXPECT_EQ(d - 14, absl::PrevWeekday(thursday, absl::Weekday::thursday));
+
+ // Thursday -> Friday
+ d = absl::NextWeekday(thursday, absl::Weekday::friday);
+ EXPECT_EQ(1, d - thursday) << d;
+ EXPECT_EQ(d - 7, absl::PrevWeekday(thursday, absl::Weekday::friday));
+
+ // Thursday -> Saturday
+ d = absl::NextWeekday(thursday, absl::Weekday::saturday);
+ EXPECT_EQ(2, d - thursday) << d;
+ EXPECT_EQ(d - 7, absl::PrevWeekday(thursday, absl::Weekday::saturday));
+
+ // Thursday -> Sunday
+ d = absl::NextWeekday(thursday, absl::Weekday::sunday);
+ EXPECT_EQ(3, d - thursday) << d;
+ EXPECT_EQ(d - 7, absl::PrevWeekday(thursday, absl::Weekday::sunday));
+
+ // Thursday -> Monday
+ d = absl::NextWeekday(thursday, absl::Weekday::monday);
+ EXPECT_EQ(4, d - thursday) << d;
+ EXPECT_EQ(d - 7, absl::PrevWeekday(thursday, absl::Weekday::monday));
+
+ // Thursday -> Tuesday
+ d = absl::NextWeekday(thursday, absl::Weekday::tuesday);
+ EXPECT_EQ(5, d - thursday) << d;
+ EXPECT_EQ(d - 7, absl::PrevWeekday(thursday, absl::Weekday::tuesday));
+
+ // Thursday -> Wednesday
+ d = absl::NextWeekday(thursday, absl::Weekday::wednesday);
+ EXPECT_EQ(6, d - thursday) << d;
+ EXPECT_EQ(d - 7, absl::PrevWeekday(thursday, absl::Weekday::wednesday));
+}
+
+// NOTE: Run this with --copt=-ftrapv to detect overflow problems.
+TEST(CivilTime, DifferenceWithHugeYear) {
+ absl::CivilDay d1(9223372036854775807, 1, 1);
+ absl::CivilDay d2(9223372036854775807, 12, 31);
+ EXPECT_EQ(364, d2 - d1);
+
+ d1 = absl::CivilDay(-9223372036854775807 - 1, 1, 1);
+ d2 = absl::CivilDay(-9223372036854775807 - 1, 12, 31);
+ EXPECT_EQ(365, d2 - d1);
+
+ // Check the limits of the return value at the end of the year range.
+ d1 = absl::CivilDay(9223372036854775807, 1, 1);
+ d2 = absl::CivilDay(9198119301927009252, 6, 6);
+ EXPECT_EQ(9223372036854775807, d1 - d2);
+ d2 = d2 - 1;
+ EXPECT_EQ(-9223372036854775807 - 1, d2 - d1);
+
+ // Check the limits of the return value at the start of the year range.
+ d1 = absl::CivilDay(-9223372036854775807 - 1, 1, 1);
+ d2 = absl::CivilDay(-9198119301927009254, 7, 28);
+ EXPECT_EQ(9223372036854775807, d2 - d1);
+ d2 = d2 + 1;
+ EXPECT_EQ(-9223372036854775807 - 1, d1 - d2);
+
+ // Check the limits of the return value from either side of year 0.
+ d1 = absl::CivilDay(-12626367463883278, 9, 3);
+ d2 = absl::CivilDay(12626367463883277, 3, 28);
+ EXPECT_EQ(9223372036854775807, d2 - d1);
+ d2 = d2 + 1;
+ EXPECT_EQ(-9223372036854775807 - 1, d1 - d2);
+}
+
+// NOTE: Run this with --copt=-ftrapv to detect overflow problems.
+TEST(CivilTime, DifferenceNoIntermediateOverflow) {
+ // The difference up to the minute field would be below the minimum
+ // int64_t, but the 52 extra seconds brings us back to the minimum.
+ absl::CivilSecond s1(-292277022657, 1, 27, 8, 29 - 1, 52);
+ absl::CivilSecond s2(1970, 1, 1, 0, 0 - 1, 0);
+ EXPECT_EQ(-9223372036854775807 - 1, s1 - s2);
+
+ // The difference up to the minute field would be above the maximum
+ // int64_t, but the -53 extra seconds brings us back to the maximum.
+ s1 = absl::CivilSecond(292277026596, 12, 4, 15, 30, 7 - 7);
+ s2 = absl::CivilSecond(1970, 1, 1, 0, 0, 0 - 7);
+ EXPECT_EQ(9223372036854775807, s1 - s2);
+}
+
+TEST(CivilTime, NormalizeSimpleOverflow) {
+ absl::CivilSecond cs;
+ cs = absl::CivilSecond(2013, 11, 15, 16, 32, 59 + 1);
+ EXPECT_EQ("2013-11-15T16:33:00", absl::FormatCivilTime(cs));
+ cs = absl::CivilSecond(2013, 11, 15, 16, 59 + 1, 14);
+ EXPECT_EQ("2013-11-15T17:00:14", absl::FormatCivilTime(cs));
+ cs = absl::CivilSecond(2013, 11, 15, 23 + 1, 32, 14);
+ EXPECT_EQ("2013-11-16T00:32:14", absl::FormatCivilTime(cs));
+ cs = absl::CivilSecond(2013, 11, 30 + 1, 16, 32, 14);
+ EXPECT_EQ("2013-12-01T16:32:14", absl::FormatCivilTime(cs));
+ cs = absl::CivilSecond(2013, 12 + 1, 15, 16, 32, 14);
+ EXPECT_EQ("2014-01-15T16:32:14", absl::FormatCivilTime(cs));
+}
+
+TEST(CivilTime, NormalizeSimpleUnderflow) {
+ absl::CivilSecond cs;
+ cs = absl::CivilSecond(2013, 11, 15, 16, 32, 0 - 1);
+ EXPECT_EQ("2013-11-15T16:31:59", absl::FormatCivilTime(cs));
+ cs = absl::CivilSecond(2013, 11, 15, 16, 0 - 1, 14);
+ EXPECT_EQ("2013-11-15T15:59:14", absl::FormatCivilTime(cs));
+ cs = absl::CivilSecond(2013, 11, 15, 0 - 1, 32, 14);
+ EXPECT_EQ("2013-11-14T23:32:14", absl::FormatCivilTime(cs));
+ cs = absl::CivilSecond(2013, 11, 1 - 1, 16, 32, 14);
+ EXPECT_EQ("2013-10-31T16:32:14", absl::FormatCivilTime(cs));
+ cs = absl::CivilSecond(2013, 1 - 1, 15, 16, 32, 14);
+ EXPECT_EQ("2012-12-15T16:32:14", absl::FormatCivilTime(cs));
+}
+
+TEST(CivilTime, NormalizeMultipleOverflow) {
+ absl::CivilSecond cs(2013, 12, 31, 23, 59, 59 + 1);
+ EXPECT_EQ("2014-01-01T00:00:00", absl::FormatCivilTime(cs));
+}
+
+TEST(CivilTime, NormalizeMultipleUnderflow) {
+ absl::CivilSecond cs(2014, 1, 1, 0, 0, 0 - 1);
+ EXPECT_EQ("2013-12-31T23:59:59", absl::FormatCivilTime(cs));
+}
+
+TEST(CivilTime, NormalizeOverflowLimits) {
+ absl::CivilSecond cs;
+
+ const int kintmax = std::numeric_limits<int>::max();
+ cs = absl::CivilSecond(0, kintmax, kintmax, kintmax, kintmax, kintmax);
+ EXPECT_EQ("185085715-11-27T12:21:07", absl::FormatCivilTime(cs));
+
+ const int kintmin = std::numeric_limits<int>::min();
+ cs = absl::CivilSecond(0, kintmin, kintmin, kintmin, kintmin, kintmin);
+ EXPECT_EQ("-185085717-10-31T10:37:52", absl::FormatCivilTime(cs));
+}
+
+TEST(CivilTime, NormalizeComplexOverflow) {
+ absl::CivilSecond cs;
+ cs = absl::CivilSecond(2013, 11, 15, 16, 32, 14 + 123456789);
+ EXPECT_EQ("2017-10-14T14:05:23", absl::FormatCivilTime(cs));
+ cs = absl::CivilSecond(2013, 11, 15, 16, 32 + 1234567, 14);
+ EXPECT_EQ("2016-03-22T00:39:14", absl::FormatCivilTime(cs));
+ cs = absl::CivilSecond(2013, 11, 15, 16 + 123456, 32, 14);
+ EXPECT_EQ("2027-12-16T16:32:14", absl::FormatCivilTime(cs));
+ cs = absl::CivilSecond(2013, 11, 15 + 1234, 16, 32, 14);
+ EXPECT_EQ("2017-04-02T16:32:14", absl::FormatCivilTime(cs));
+ cs = absl::CivilSecond(2013, 11 + 123, 15, 16, 32, 14);
+ EXPECT_EQ("2024-02-15T16:32:14", absl::FormatCivilTime(cs));
+}
+
+TEST(CivilTime, NormalizeComplexUnderflow) {
+ absl::CivilSecond cs;
+ cs = absl::CivilSecond(1999, 3, 0, 0, 0, 0); // year 400
+ EXPECT_EQ("1999-02-28T00:00:00", absl::FormatCivilTime(cs));
+ cs = absl::CivilSecond(2013, 11, 15, 16, 32, 14 - 123456789);
+ EXPECT_EQ("2009-12-17T18:59:05", absl::FormatCivilTime(cs));
+ cs = absl::CivilSecond(2013, 11, 15, 16, 32 - 1234567, 14);
+ EXPECT_EQ("2011-07-12T08:25:14", absl::FormatCivilTime(cs));
+ cs = absl::CivilSecond(2013, 11, 15, 16 - 123456, 32, 14);
+ EXPECT_EQ("1999-10-16T16:32:14", absl::FormatCivilTime(cs));
+ cs = absl::CivilSecond(2013, 11, 15 - 1234, 16, 32, 14);
+ EXPECT_EQ("2010-06-30T16:32:14", absl::FormatCivilTime(cs));
+ cs = absl::CivilSecond(2013, 11 - 123, 15, 16, 32, 14);
+ EXPECT_EQ("2003-08-15T16:32:14", absl::FormatCivilTime(cs));
+}
+
+TEST(CivilTime, NormalizeMishmash) {
+ absl::CivilSecond cs;
+ cs = absl::CivilSecond(2013, 11 - 123, 15 + 1234, 16 - 123456, 32 + 1234567,
+ 14 - 123456789);
+ EXPECT_EQ("1991-05-09T03:06:05", absl::FormatCivilTime(cs));
+ cs = absl::CivilSecond(2013, 11 + 123, 15 - 1234, 16 + 123456, 32 - 1234567,
+ 14 + 123456789);
+ EXPECT_EQ("2036-05-24T05:58:23", absl::FormatCivilTime(cs));
+
+ cs = absl::CivilSecond(2013, 11, -146097 + 1, 16, 32, 14);
+ EXPECT_EQ("1613-11-01T16:32:14", absl::FormatCivilTime(cs));
+ cs = absl::CivilSecond(2013, 11 + 400 * 12, -146097 + 1, 16, 32, 14);
+ EXPECT_EQ("2013-11-01T16:32:14", absl::FormatCivilTime(cs));
+}
+
+// Convert all the days from 1970-1-1 to 1970-1-146097 (aka 2369-12-31)
+// and check that they normalize to the expected time. 146097 days span
+// the 400-year Gregorian cycle used during normalization.
+TEST(CivilTime, NormalizeAllTheDays) {
+ absl::CivilDay expected(1970, 1, 1);
+ for (int day = 1; day <= 146097; ++day) {
+ absl::CivilSecond cs(1970, 1, day, 0, 0, 0);
+ EXPECT_EQ(expected, cs);
+ ++expected;
+ }
+}
+
+TEST(CivilTime, NormalizeWithHugeYear) {
+ absl::CivilMonth c(9223372036854775807, 1);
+ EXPECT_EQ("9223372036854775807-01", absl::FormatCivilTime(c));
+ c = c - 1; // Causes normalization
+ EXPECT_EQ("9223372036854775806-12", absl::FormatCivilTime(c));
+
+ c = absl::CivilMonth(-9223372036854775807 - 1, 1);
+ EXPECT_EQ("-9223372036854775808-01", absl::FormatCivilTime(c));
+ c = c + 12; // Causes normalization
+ EXPECT_EQ("-9223372036854775807-01", absl::FormatCivilTime(c));
+}
+
+TEST(CivilTime, LeapYears) {
+ const absl::CivilSecond s1(2013, 2, 28 + 1, 0, 0, 0);
+ EXPECT_EQ("2013-03-01T00:00:00", absl::FormatCivilTime(s1));
+
+ const absl::CivilSecond s2(2012, 2, 28 + 1, 0, 0, 0);
+ EXPECT_EQ("2012-02-29T00:00:00", absl::FormatCivilTime(s2));
+
+ const absl::CivilSecond s3(1900, 2, 28 + 1, 0, 0, 0);
+ EXPECT_EQ("1900-03-01T00:00:00", absl::FormatCivilTime(s3));
+
+ const struct {
+ int year;
+ int days;
+ struct {
+ int month;
+ int day;
+ } leap_day; // The date of the day after Feb 28.
+ } kLeapYearTable[]{
+ {1900, 365, {3, 1}},
+ {1999, 365, {3, 1}},
+ {2000, 366, {2, 29}}, // leap year
+ {2001, 365, {3, 1}},
+ {2002, 365, {3, 1}},
+ {2003, 365, {3, 1}},
+ {2004, 366, {2, 29}}, // leap year
+ {2005, 365, {3, 1}},
+ {2006, 365, {3, 1}},
+ {2007, 365, {3, 1}},
+ {2008, 366, {2, 29}}, // leap year
+ {2009, 365, {3, 1}},
+ {2100, 365, {3, 1}},
+ };
+
+ for (int i = 0; i < ABSL_ARRAYSIZE(kLeapYearTable); ++i) {
+ const int y = kLeapYearTable[i].year;
+ const int m = kLeapYearTable[i].leap_day.month;
+ const int d = kLeapYearTable[i].leap_day.day;
+ const int n = kLeapYearTable[i].days;
+
+ // Tests incrementing through the leap day.
+ const absl::CivilDay feb28(y, 2, 28);
+ const absl::CivilDay next_day = feb28 + 1;
+ EXPECT_EQ(m, next_day.month());
+ EXPECT_EQ(d, next_day.day());
+
+ // Tests difference in days of leap years.
+ const absl::CivilYear year(feb28);
+ const absl::CivilYear next_year = year + 1;
+ EXPECT_EQ(n, absl::CivilDay(next_year) - absl::CivilDay(year));
+ }
+}
+
+TEST(CivilTime, FirstThursdayInMonth) {
+ const absl::CivilDay nov1(2014, 11, 1);
+ const absl::CivilDay thursday =
+ absl::NextWeekday(nov1 - 1, absl::Weekday::thursday);
+ EXPECT_EQ("2014-11-06", absl::FormatCivilTime(thursday));
+
+ // Bonus: Date of Thanksgiving in the United States
+ // Rule: Fourth Thursday of November
+ const absl::CivilDay thanksgiving = thursday + 7 * 3;
+ EXPECT_EQ("2014-11-27", absl::FormatCivilTime(thanksgiving));
+}
+
+TEST(CivilTime, DocumentationExample) {
+ absl::CivilSecond second(2015, 6, 28, 1, 2, 3); // 2015-06-28 01:02:03
+ absl::CivilMinute minute(second); // 2015-06-28 01:02:00
+ absl::CivilDay day(minute); // 2015-06-28 00:00:00
+
+ second -= 1; // 2015-06-28 01:02:02
+ --second; // 2015-06-28 01:02:01
+ EXPECT_EQ(minute, second - 1); // Comparison between types
+ EXPECT_LT(minute, second);
+
+ // int diff = second - minute; // ERROR: Mixed types, won't compile
+
+ absl::CivilDay june_1(2015, 6, 1); // Pass fields to c'tor.
+ int diff = day - june_1; // Num days between 'day' and June 1
+ EXPECT_EQ(27, diff);
+
+ // Fields smaller than alignment are floored to their minimum value.
+ absl::CivilDay day_floor(2015, 1, 2, 9, 9, 9);
+ EXPECT_EQ(0, day_floor.hour()); // 09:09:09 is floored
+ EXPECT_EQ(absl::CivilDay(2015, 1, 2), day_floor);
+
+ // Unspecified fields default to their minium value
+ absl::CivilDay day_default(2015); // Defaults to Jan 1
+ EXPECT_EQ(absl::CivilDay(2015, 1, 1), day_default);
+
+ // Iterates all the days of June.
+ absl::CivilMonth june(day); // CivilDay -> CivilMonth
+ absl::CivilMonth july = june + 1;
+ for (absl::CivilDay day = june_1; day < july; ++day) {
+ // ...
+ }
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/time/clock.cc b/third_party/abseil/src/absl/time/clock.cc
new file mode 100644
index 0000000..6862e01
--- /dev/null
+++ b/third_party/abseil/src/absl/time/clock.cc
@@ -0,0 +1,567 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/time/clock.h"
+
+#include "absl/base/attributes.h"
+
+#ifdef _WIN32
+#include <windows.h>
+#endif
+
+#include <algorithm>
+#include <atomic>
+#include <cerrno>
+#include <cstdint>
+#include <ctime>
+#include <limits>
+
+#include "absl/base/internal/spinlock.h"
+#include "absl/base/internal/unscaledcycleclock.h"
+#include "absl/base/macros.h"
+#include "absl/base/port.h"
+#include "absl/base/thread_annotations.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+Time Now() {
+ // TODO(bww): Get a timespec instead so we don't have to divide.
+ int64_t n = absl::GetCurrentTimeNanos();
+ if (n >= 0) {
+ return time_internal::FromUnixDuration(
+ time_internal::MakeDuration(n / 1000000000, n % 1000000000 * 4));
+ }
+ return time_internal::FromUnixDuration(absl::Nanoseconds(n));
+}
+ABSL_NAMESPACE_END
+} // namespace absl
+
+// Decide if we should use the fast GetCurrentTimeNanos() algorithm
+// based on the cyclecounter, otherwise just get the time directly
+// from the OS on every call. This can be chosen at compile-time via
+// -DABSL_USE_CYCLECLOCK_FOR_GET_CURRENT_TIME_NANOS=[0|1]
+#ifndef ABSL_USE_CYCLECLOCK_FOR_GET_CURRENT_TIME_NANOS
+#if ABSL_USE_UNSCALED_CYCLECLOCK
+#define ABSL_USE_CYCLECLOCK_FOR_GET_CURRENT_TIME_NANOS 1
+#else
+#define ABSL_USE_CYCLECLOCK_FOR_GET_CURRENT_TIME_NANOS 0
+#endif
+#endif
+
+#if defined(__APPLE__) || defined(_WIN32)
+#include "absl/time/internal/get_current_time_chrono.inc"
+#else
+#include "absl/time/internal/get_current_time_posix.inc"
+#endif
+
+// Allows override by test.
+#ifndef GET_CURRENT_TIME_NANOS_FROM_SYSTEM
+#define GET_CURRENT_TIME_NANOS_FROM_SYSTEM() \
+ ::absl::time_internal::GetCurrentTimeNanosFromSystem()
+#endif
+
+#if !ABSL_USE_CYCLECLOCK_FOR_GET_CURRENT_TIME_NANOS
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+int64_t GetCurrentTimeNanos() { return GET_CURRENT_TIME_NANOS_FROM_SYSTEM(); }
+ABSL_NAMESPACE_END
+} // namespace absl
+#else // Use the cyclecounter-based implementation below.
+
+// Allows override by test.
+#ifndef GET_CURRENT_TIME_NANOS_CYCLECLOCK_NOW
+#define GET_CURRENT_TIME_NANOS_CYCLECLOCK_NOW() \
+ ::absl::time_internal::UnscaledCycleClockWrapperForGetCurrentTime::Now()
+#endif
+
+// The following counters are used only by the test code.
+static int64_t stats_initializations;
+static int64_t stats_reinitializations;
+static int64_t stats_calibrations;
+static int64_t stats_slow_paths;
+static int64_t stats_fast_slow_paths;
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace time_internal {
+// This is a friend wrapper around UnscaledCycleClock::Now()
+// (needed to access UnscaledCycleClock).
+class UnscaledCycleClockWrapperForGetCurrentTime {
+ public:
+ static int64_t Now() { return base_internal::UnscaledCycleClock::Now(); }
+};
+} // namespace time_internal
+
+// uint64_t is used in this module to provide an extra bit in multiplications
+
+// Return the time in ns as told by the kernel interface. Place in *cycleclock
+// the value of the cycleclock at about the time of the syscall.
+// This call represents the time base that this module synchronizes to.
+// Ensures that *cycleclock does not step back by up to (1 << 16) from
+// last_cycleclock, to discard small backward counter steps. (Larger steps are
+// assumed to be complete resyncs, which shouldn't happen. If they do, a full
+// reinitialization of the outer algorithm should occur.)
+static int64_t GetCurrentTimeNanosFromKernel(uint64_t last_cycleclock,
+ uint64_t *cycleclock) {
+ // We try to read clock values at about the same time as the kernel clock.
+ // This value gets adjusted up or down as estimate of how long that should
+ // take, so we can reject attempts that take unusually long.
+ static std::atomic<uint64_t> approx_syscall_time_in_cycles{10 * 1000};
+
+ uint64_t local_approx_syscall_time_in_cycles = // local copy
+ approx_syscall_time_in_cycles.load(std::memory_order_relaxed);
+
+ int64_t current_time_nanos_from_system;
+ uint64_t before_cycles;
+ uint64_t after_cycles;
+ uint64_t elapsed_cycles;
+ int loops = 0;
+ do {
+ before_cycles = GET_CURRENT_TIME_NANOS_CYCLECLOCK_NOW();
+ current_time_nanos_from_system = GET_CURRENT_TIME_NANOS_FROM_SYSTEM();
+ after_cycles = GET_CURRENT_TIME_NANOS_CYCLECLOCK_NOW();
+ // elapsed_cycles is unsigned, so is large on overflow
+ elapsed_cycles = after_cycles - before_cycles;
+ if (elapsed_cycles >= local_approx_syscall_time_in_cycles &&
+ ++loops == 20) { // clock changed frequencies? Back off.
+ loops = 0;
+ if (local_approx_syscall_time_in_cycles < 1000 * 1000) {
+ local_approx_syscall_time_in_cycles =
+ (local_approx_syscall_time_in_cycles + 1) << 1;
+ }
+ approx_syscall_time_in_cycles.store(
+ local_approx_syscall_time_in_cycles,
+ std::memory_order_relaxed);
+ }
+ } while (elapsed_cycles >= local_approx_syscall_time_in_cycles ||
+ last_cycleclock - after_cycles < (static_cast<uint64_t>(1) << 16));
+
+ // Number of times in a row we've seen a kernel time call take substantially
+ // less than approx_syscall_time_in_cycles.
+ static std::atomic<uint32_t> seen_smaller{ 0 };
+
+ // Adjust approx_syscall_time_in_cycles to be within a factor of 2
+ // of the typical time to execute one iteration of the loop above.
+ if ((local_approx_syscall_time_in_cycles >> 1) < elapsed_cycles) {
+ // measured time is no smaller than half current approximation
+ seen_smaller.store(0, std::memory_order_relaxed);
+ } else if (seen_smaller.fetch_add(1, std::memory_order_relaxed) >= 3) {
+ // smaller delays several times in a row; reduce approximation by 12.5%
+ const uint64_t new_approximation =
+ local_approx_syscall_time_in_cycles -
+ (local_approx_syscall_time_in_cycles >> 3);
+ approx_syscall_time_in_cycles.store(new_approximation,
+ std::memory_order_relaxed);
+ seen_smaller.store(0, std::memory_order_relaxed);
+ }
+
+ *cycleclock = after_cycles;
+ return current_time_nanos_from_system;
+}
+
+
+// ---------------------------------------------------------------------
+// An implementation of reader-write locks that use no atomic ops in the read
+// case. This is a generalization of Lamport's method for reading a multiword
+// clock. Increment a word on each write acquisition, using the low-order bit
+// as a spinlock; the word is the high word of the "clock". Readers read the
+// high word, then all other data, then the high word again, and repeat the
+// read if the reads of the high words yields different answers, or an odd
+// value (either case suggests possible interference from a writer).
+// Here we use a spinlock to ensure only one writer at a time, rather than
+// spinning on the bottom bit of the word to benefit from SpinLock
+// spin-delay tuning.
+
+// Acquire seqlock (*seq) and return the value to be written to unlock.
+static inline uint64_t SeqAcquire(std::atomic<uint64_t> *seq) {
+ uint64_t x = seq->fetch_add(1, std::memory_order_relaxed);
+
+ // We put a release fence between update to *seq and writes to shared data.
+ // Thus all stores to shared data are effectively release operations and
+ // update to *seq above cannot be re-ordered past any of them. Note that
+ // this barrier is not for the fetch_add above. A release barrier for the
+ // fetch_add would be before it, not after.
+ std::atomic_thread_fence(std::memory_order_release);
+
+ return x + 2; // original word plus 2
+}
+
+// Release seqlock (*seq) by writing x to it---a value previously returned by
+// SeqAcquire.
+static inline void SeqRelease(std::atomic<uint64_t> *seq, uint64_t x) {
+ // The unlock store to *seq must have release ordering so that all
+ // updates to shared data must finish before this store.
+ seq->store(x, std::memory_order_release); // release lock for readers
+}
+
+// ---------------------------------------------------------------------
+
+// "nsscaled" is unit of time equal to a (2**kScale)th of a nanosecond.
+enum { kScale = 30 };
+
+// The minimum interval between samples of the time base.
+// We pick enough time to amortize the cost of the sample,
+// to get a reasonably accurate cycle counter rate reading,
+// and not so much that calculations will overflow 64-bits.
+static const uint64_t kMinNSBetweenSamples = 2000 << 20;
+
+// We require that kMinNSBetweenSamples shifted by kScale
+// have at least a bit left over for 64-bit calculations.
+static_assert(((kMinNSBetweenSamples << (kScale + 1)) >> (kScale + 1)) ==
+ kMinNSBetweenSamples,
+ "cannot represent kMaxBetweenSamplesNSScaled");
+
+// A reader-writer lock protecting the static locations below.
+// See SeqAcquire() and SeqRelease() above.
+ABSL_CONST_INIT static absl::base_internal::SpinLock lock(
+ absl::kConstInit, base_internal::SCHEDULE_KERNEL_ONLY);
+ABSL_CONST_INIT static std::atomic<uint64_t> seq(0);
+
+// data from a sample of the kernel's time value
+struct TimeSampleAtomic {
+ std::atomic<uint64_t> raw_ns; // raw kernel time
+ std::atomic<uint64_t> base_ns; // our estimate of time
+ std::atomic<uint64_t> base_cycles; // cycle counter reading
+ std::atomic<uint64_t> nsscaled_per_cycle; // cycle period
+ // cycles before we'll sample again (a scaled reciprocal of the period,
+ // to avoid a division on the fast path).
+ std::atomic<uint64_t> min_cycles_per_sample;
+};
+// Same again, but with non-atomic types
+struct TimeSample {
+ uint64_t raw_ns; // raw kernel time
+ uint64_t base_ns; // our estimate of time
+ uint64_t base_cycles; // cycle counter reading
+ uint64_t nsscaled_per_cycle; // cycle period
+ uint64_t min_cycles_per_sample; // approx cycles before next sample
+};
+
+static struct TimeSampleAtomic last_sample; // the last sample; under seq
+
+static int64_t GetCurrentTimeNanosSlowPath() ABSL_ATTRIBUTE_COLD;
+
+// Read the contents of *atomic into *sample.
+// Each field is read atomically, but to maintain atomicity between fields,
+// the access must be done under a lock.
+static void ReadTimeSampleAtomic(const struct TimeSampleAtomic *atomic,
+ struct TimeSample *sample) {
+ sample->base_ns = atomic->base_ns.load(std::memory_order_relaxed);
+ sample->base_cycles = atomic->base_cycles.load(std::memory_order_relaxed);
+ sample->nsscaled_per_cycle =
+ atomic->nsscaled_per_cycle.load(std::memory_order_relaxed);
+ sample->min_cycles_per_sample =
+ atomic->min_cycles_per_sample.load(std::memory_order_relaxed);
+ sample->raw_ns = atomic->raw_ns.load(std::memory_order_relaxed);
+}
+
+// Public routine.
+// Algorithm: We wish to compute real time from a cycle counter. In normal
+// operation, we construct a piecewise linear approximation to the kernel time
+// source, using the cycle counter value. The start of each line segment is at
+// the same point as the end of the last, but may have a different slope (that
+// is, a different idea of the cycle counter frequency). Every couple of
+// seconds, the kernel time source is sampled and compared with the current
+// approximation. A new slope is chosen that, if followed for another couple
+// of seconds, will correct the error at the current position. The information
+// for a sample is in the "last_sample" struct. The linear approximation is
+// estimated_time = last_sample.base_ns +
+// last_sample.ns_per_cycle * (counter_reading - last_sample.base_cycles)
+// (ns_per_cycle is actually stored in different units and scaled, to avoid
+// overflow). The base_ns of the next linear approximation is the
+// estimated_time using the last approximation; the base_cycles is the cycle
+// counter value at that time; the ns_per_cycle is the number of ns per cycle
+// measured since the last sample, but adjusted so that most of the difference
+// between the estimated_time and the kernel time will be corrected by the
+// estimated time to the next sample. In normal operation, this algorithm
+// relies on:
+// - the cycle counter and kernel time rates not changing a lot in a few
+// seconds.
+// - the client calling into the code often compared to a couple of seconds, so
+// the time to the next correction can be estimated.
+// Any time ns_per_cycle is not known, a major error is detected, or the
+// assumption about frequent calls is violated, the implementation returns the
+// kernel time. It records sufficient data that a linear approximation can
+// resume a little later.
+
+int64_t GetCurrentTimeNanos() {
+ // read the data from the "last_sample" struct (but don't need raw_ns yet)
+ // The reads of "seq" and test of the values emulate a reader lock.
+ uint64_t base_ns;
+ uint64_t base_cycles;
+ uint64_t nsscaled_per_cycle;
+ uint64_t min_cycles_per_sample;
+ uint64_t seq_read0;
+ uint64_t seq_read1;
+
+ // If we have enough information to interpolate, the value returned will be
+ // derived from this cycleclock-derived time estimate. On some platforms
+ // (POWER) the function to retrieve this value has enough complexity to
+ // contribute to register pressure - reading it early before initializing
+ // the other pieces of the calculation minimizes spill/restore instructions,
+ // minimizing icache cost.
+ uint64_t now_cycles = GET_CURRENT_TIME_NANOS_CYCLECLOCK_NOW();
+
+ // Acquire pairs with the barrier in SeqRelease - if this load sees that
+ // store, the shared-data reads necessarily see that SeqRelease's updates
+ // to the same shared data.
+ seq_read0 = seq.load(std::memory_order_acquire);
+
+ base_ns = last_sample.base_ns.load(std::memory_order_relaxed);
+ base_cycles = last_sample.base_cycles.load(std::memory_order_relaxed);
+ nsscaled_per_cycle =
+ last_sample.nsscaled_per_cycle.load(std::memory_order_relaxed);
+ min_cycles_per_sample =
+ last_sample.min_cycles_per_sample.load(std::memory_order_relaxed);
+
+ // This acquire fence pairs with the release fence in SeqAcquire. Since it
+ // is sequenced between reads of shared data and seq_read1, the reads of
+ // shared data are effectively acquiring.
+ std::atomic_thread_fence(std::memory_order_acquire);
+
+ // The shared-data reads are effectively acquire ordered, and the
+ // shared-data writes are effectively release ordered. Therefore if our
+ // shared-data reads see any of a particular update's shared-data writes,
+ // seq_read1 is guaranteed to see that update's SeqAcquire.
+ seq_read1 = seq.load(std::memory_order_relaxed);
+
+ // Fast path. Return if min_cycles_per_sample has not yet elapsed since the
+ // last sample, and we read a consistent sample. The fast path activates
+ // only when min_cycles_per_sample is non-zero, which happens when we get an
+ // estimate for the cycle time. The predicate will fail if now_cycles <
+ // base_cycles, or if some other thread is in the slow path.
+ //
+ // Since we now read now_cycles before base_ns, it is possible for now_cycles
+ // to be less than base_cycles (if we were interrupted between those loads and
+ // last_sample was updated). This is harmless, because delta_cycles will wrap
+ // and report a time much much bigger than min_cycles_per_sample. In that case
+ // we will take the slow path.
+ uint64_t delta_cycles = now_cycles - base_cycles;
+ if (seq_read0 == seq_read1 && (seq_read0 & 1) == 0 &&
+ delta_cycles < min_cycles_per_sample) {
+ return base_ns + ((delta_cycles * nsscaled_per_cycle) >> kScale);
+ }
+ return GetCurrentTimeNanosSlowPath();
+}
+
+// Return (a << kScale)/b.
+// Zero is returned if b==0. Scaling is performed internally to
+// preserve precision without overflow.
+static uint64_t SafeDivideAndScale(uint64_t a, uint64_t b) {
+ // Find maximum safe_shift so that
+ // 0 <= safe_shift <= kScale and (a << safe_shift) does not overflow.
+ int safe_shift = kScale;
+ while (((a << safe_shift) >> safe_shift) != a) {
+ safe_shift--;
+ }
+ uint64_t scaled_b = b >> (kScale - safe_shift);
+ uint64_t quotient = 0;
+ if (scaled_b != 0) {
+ quotient = (a << safe_shift) / scaled_b;
+ }
+ return quotient;
+}
+
+static uint64_t UpdateLastSample(
+ uint64_t now_cycles, uint64_t now_ns, uint64_t delta_cycles,
+ const struct TimeSample *sample) ABSL_ATTRIBUTE_COLD;
+
+// The slow path of GetCurrentTimeNanos(). This is taken while gathering
+// initial samples, when enough time has elapsed since the last sample, and if
+// any other thread is writing to last_sample.
+//
+// Manually mark this 'noinline' to minimize stack frame size of the fast
+// path. Without this, sometimes a compiler may inline this big block of code
+// into the fast path. That causes lots of register spills and reloads that
+// are unnecessary unless the slow path is taken.
+//
+// TODO(absl-team): Remove this attribute when our compiler is smart enough
+// to do the right thing.
+ABSL_ATTRIBUTE_NOINLINE
+static int64_t GetCurrentTimeNanosSlowPath() ABSL_LOCKS_EXCLUDED(lock) {
+ // Serialize access to slow-path. Fast-path readers are not blocked yet, and
+ // code below must not modify last_sample until the seqlock is acquired.
+ lock.Lock();
+
+ // Sample the kernel time base. This is the definition of
+ // "now" if we take the slow path.
+ static uint64_t last_now_cycles; // protected by lock
+ uint64_t now_cycles;
+ uint64_t now_ns = GetCurrentTimeNanosFromKernel(last_now_cycles, &now_cycles);
+ last_now_cycles = now_cycles;
+
+ uint64_t estimated_base_ns;
+
+ // ----------
+ // Read the "last_sample" values again; this time holding the write lock.
+ struct TimeSample sample;
+ ReadTimeSampleAtomic(&last_sample, &sample);
+
+ // ----------
+ // Try running the fast path again; another thread may have updated the
+ // sample between our run of the fast path and the sample we just read.
+ uint64_t delta_cycles = now_cycles - sample.base_cycles;
+ if (delta_cycles < sample.min_cycles_per_sample) {
+ // Another thread updated the sample. This path does not take the seqlock
+ // so that blocked readers can make progress without blocking new readers.
+ estimated_base_ns = sample.base_ns +
+ ((delta_cycles * sample.nsscaled_per_cycle) >> kScale);
+ stats_fast_slow_paths++;
+ } else {
+ estimated_base_ns =
+ UpdateLastSample(now_cycles, now_ns, delta_cycles, &sample);
+ }
+
+ lock.Unlock();
+
+ return estimated_base_ns;
+}
+
+// Main part of the algorithm. Locks out readers, updates the approximation
+// using the new sample from the kernel, and stores the result in last_sample
+// for readers. Returns the new estimated time.
+static uint64_t UpdateLastSample(uint64_t now_cycles, uint64_t now_ns,
+ uint64_t delta_cycles,
+ const struct TimeSample *sample)
+ ABSL_EXCLUSIVE_LOCKS_REQUIRED(lock) {
+ uint64_t estimated_base_ns = now_ns;
+ uint64_t lock_value = SeqAcquire(&seq); // acquire seqlock to block readers
+
+ // The 5s in the next if-statement limits the time for which we will trust
+ // the cycle counter and our last sample to give a reasonable result.
+ // Errors in the rate of the source clock can be multiplied by the ratio
+ // between this limit and kMinNSBetweenSamples.
+ if (sample->raw_ns == 0 || // no recent sample, or clock went backwards
+ sample->raw_ns + static_cast<uint64_t>(5) * 1000 * 1000 * 1000 < now_ns ||
+ now_ns < sample->raw_ns || now_cycles < sample->base_cycles) {
+ // record this sample, and forget any previously known slope.
+ last_sample.raw_ns.store(now_ns, std::memory_order_relaxed);
+ last_sample.base_ns.store(estimated_base_ns, std::memory_order_relaxed);
+ last_sample.base_cycles.store(now_cycles, std::memory_order_relaxed);
+ last_sample.nsscaled_per_cycle.store(0, std::memory_order_relaxed);
+ last_sample.min_cycles_per_sample.store(0, std::memory_order_relaxed);
+ stats_initializations++;
+ } else if (sample->raw_ns + 500 * 1000 * 1000 < now_ns &&
+ sample->base_cycles + 50 < now_cycles) {
+ // Enough time has passed to compute the cycle time.
+ if (sample->nsscaled_per_cycle != 0) { // Have a cycle time estimate.
+ // Compute time from counter reading, but avoiding overflow
+ // delta_cycles may be larger than on the fast path.
+ uint64_t estimated_scaled_ns;
+ int s = -1;
+ do {
+ s++;
+ estimated_scaled_ns = (delta_cycles >> s) * sample->nsscaled_per_cycle;
+ } while (estimated_scaled_ns / sample->nsscaled_per_cycle !=
+ (delta_cycles >> s));
+ estimated_base_ns = sample->base_ns +
+ (estimated_scaled_ns >> (kScale - s));
+ }
+
+ // Compute the assumed cycle time kMinNSBetweenSamples ns into the future
+ // assuming the cycle counter rate stays the same as the last interval.
+ uint64_t ns = now_ns - sample->raw_ns;
+ uint64_t measured_nsscaled_per_cycle = SafeDivideAndScale(ns, delta_cycles);
+
+ uint64_t assumed_next_sample_delta_cycles =
+ SafeDivideAndScale(kMinNSBetweenSamples, measured_nsscaled_per_cycle);
+
+ int64_t diff_ns = now_ns - estimated_base_ns; // estimate low by this much
+
+ // We want to set nsscaled_per_cycle so that our estimate of the ns time
+ // at the assumed cycle time is the assumed ns time.
+ // That is, we want to set nsscaled_per_cycle so:
+ // kMinNSBetweenSamples + diff_ns ==
+ // (assumed_next_sample_delta_cycles * nsscaled_per_cycle) >> kScale
+ // But we wish to damp oscillations, so instead correct only most
+ // of our current error, by solving:
+ // kMinNSBetweenSamples + diff_ns - (diff_ns / 16) ==
+ // (assumed_next_sample_delta_cycles * nsscaled_per_cycle) >> kScale
+ ns = kMinNSBetweenSamples + diff_ns - (diff_ns / 16);
+ uint64_t new_nsscaled_per_cycle =
+ SafeDivideAndScale(ns, assumed_next_sample_delta_cycles);
+ if (new_nsscaled_per_cycle != 0 &&
+ diff_ns < 100 * 1000 * 1000 && -diff_ns < 100 * 1000 * 1000) {
+ // record the cycle time measurement
+ last_sample.nsscaled_per_cycle.store(
+ new_nsscaled_per_cycle, std::memory_order_relaxed);
+ uint64_t new_min_cycles_per_sample =
+ SafeDivideAndScale(kMinNSBetweenSamples, new_nsscaled_per_cycle);
+ last_sample.min_cycles_per_sample.store(
+ new_min_cycles_per_sample, std::memory_order_relaxed);
+ stats_calibrations++;
+ } else { // something went wrong; forget the slope
+ last_sample.nsscaled_per_cycle.store(0, std::memory_order_relaxed);
+ last_sample.min_cycles_per_sample.store(0, std::memory_order_relaxed);
+ estimated_base_ns = now_ns;
+ stats_reinitializations++;
+ }
+ last_sample.raw_ns.store(now_ns, std::memory_order_relaxed);
+ last_sample.base_ns.store(estimated_base_ns, std::memory_order_relaxed);
+ last_sample.base_cycles.store(now_cycles, std::memory_order_relaxed);
+ } else {
+ // have a sample, but no slope; waiting for enough time for a calibration
+ stats_slow_paths++;
+ }
+
+ SeqRelease(&seq, lock_value); // release the readers
+
+ return estimated_base_ns;
+}
+ABSL_NAMESPACE_END
+} // namespace absl
+#endif // ABSL_USE_CYCLECLOCK_FOR_GET_CURRENT_TIME_NANOS
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace {
+
+// Returns the maximum duration that SleepOnce() can sleep for.
+constexpr absl::Duration MaxSleep() {
+#ifdef _WIN32
+ // Windows Sleep() takes unsigned long argument in milliseconds.
+ return absl::Milliseconds(
+ std::numeric_limits<unsigned long>::max()); // NOLINT(runtime/int)
+#else
+ return absl::Seconds(std::numeric_limits<time_t>::max());
+#endif
+}
+
+// Sleeps for the given duration.
+// REQUIRES: to_sleep <= MaxSleep().
+void SleepOnce(absl::Duration to_sleep) {
+#ifdef _WIN32
+ Sleep(to_sleep / absl::Milliseconds(1));
+#else
+ struct timespec sleep_time = absl::ToTimespec(to_sleep);
+ while (nanosleep(&sleep_time, &sleep_time) != 0 && errno == EINTR) {
+ // Ignore signals and wait for the full interval to elapse.
+ }
+#endif
+}
+
+} // namespace
+ABSL_NAMESPACE_END
+} // namespace absl
+
+extern "C" {
+
+ABSL_ATTRIBUTE_WEAK void AbslInternalSleepFor(absl::Duration duration) {
+ while (duration > absl::ZeroDuration()) {
+ absl::Duration to_sleep = std::min(duration, absl::MaxSleep());
+ absl::SleepOnce(to_sleep);
+ duration -= to_sleep;
+ }
+}
+
+} // extern "C"
diff --git a/third_party/abseil/src/absl/time/clock.h b/third_party/abseil/src/absl/time/clock.h
new file mode 100644
index 0000000..27764a9
--- /dev/null
+++ b/third_party/abseil/src/absl/time/clock.h
@@ -0,0 +1,74 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: clock.h
+// -----------------------------------------------------------------------------
+//
+// This header file contains utility functions for working with the system-wide
+// realtime clock. For descriptions of the main time abstractions used within
+// this header file, consult the time.h header file.
+#ifndef ABSL_TIME_CLOCK_H_
+#define ABSL_TIME_CLOCK_H_
+
+#include "absl/base/macros.h"
+#include "absl/time/time.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+// Now()
+//
+// Returns the current time, expressed as an `absl::Time` absolute time value.
+absl::Time Now();
+
+// GetCurrentTimeNanos()
+//
+// Returns the current time, expressed as a count of nanoseconds since the Unix
+// Epoch (https://en.wikipedia.org/wiki/Unix_time). Prefer `absl::Now()` instead
+// for all but the most performance-sensitive cases (i.e. when you are calling
+// this function hundreds of thousands of times per second).
+int64_t GetCurrentTimeNanos();
+
+// SleepFor()
+//
+// Sleeps for the specified duration, expressed as an `absl::Duration`.
+//
+// Notes:
+// * Signal interruptions will not reduce the sleep duration.
+// * Returns immediately when passed a nonpositive duration.
+void SleepFor(absl::Duration duration);
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+// -----------------------------------------------------------------------------
+// Implementation Details
+// -----------------------------------------------------------------------------
+
+// In some build configurations we pass --detect-odr-violations to the
+// gold linker. This causes it to flag weak symbol overrides as ODR
+// violations. Because ODR only applies to C++ and not C,
+// --detect-odr-violations ignores symbols not mangled with C++ names.
+// By changing our extension points to be extern "C", we dodge this
+// check.
+extern "C" {
+void AbslInternalSleepFor(absl::Duration duration);
+} // extern "C"
+
+inline void absl::SleepFor(absl::Duration duration) {
+ AbslInternalSleepFor(duration);
+}
+
+#endif // ABSL_TIME_CLOCK_H_
diff --git a/third_party/abseil/src/absl/time/clock_benchmark.cc b/third_party/abseil/src/absl/time/clock_benchmark.cc
new file mode 100644
index 0000000..c5c795e
--- /dev/null
+++ b/third_party/abseil/src/absl/time/clock_benchmark.cc
@@ -0,0 +1,74 @@
+// Copyright 2018 The Abseil Authors.
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/time/clock.h"
+
+#if !defined(_WIN32)
+#include <sys/time.h>
+#else
+#include <winsock2.h>
+#endif // _WIN32
+#include <cstdio>
+
+#include "absl/base/internal/cycleclock.h"
+#include "benchmark/benchmark.h"
+
+namespace {
+
+void BM_Clock_Now_AbslTime(benchmark::State& state) {
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(absl::Now());
+ }
+}
+BENCHMARK(BM_Clock_Now_AbslTime);
+
+void BM_Clock_Now_GetCurrentTimeNanos(benchmark::State& state) {
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(absl::GetCurrentTimeNanos());
+ }
+}
+BENCHMARK(BM_Clock_Now_GetCurrentTimeNanos);
+
+void BM_Clock_Now_AbslTime_ToUnixNanos(benchmark::State& state) {
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(absl::ToUnixNanos(absl::Now()));
+ }
+}
+BENCHMARK(BM_Clock_Now_AbslTime_ToUnixNanos);
+
+void BM_Clock_Now_CycleClock(benchmark::State& state) {
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(absl::base_internal::CycleClock::Now());
+ }
+}
+BENCHMARK(BM_Clock_Now_CycleClock);
+
+#if !defined(_WIN32)
+static void BM_Clock_Now_gettimeofday(benchmark::State& state) {
+ struct timeval tv;
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(gettimeofday(&tv, nullptr));
+ }
+}
+BENCHMARK(BM_Clock_Now_gettimeofday);
+
+static void BM_Clock_Now_clock_gettime(benchmark::State& state) {
+ struct timespec ts;
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(clock_gettime(CLOCK_REALTIME, &ts));
+ }
+}
+BENCHMARK(BM_Clock_Now_clock_gettime);
+#endif // _WIN32
+
+} // namespace
diff --git a/third_party/abseil/src/absl/time/clock_test.cc b/third_party/abseil/src/absl/time/clock_test.cc
new file mode 100644
index 0000000..4bcfc6b
--- /dev/null
+++ b/third_party/abseil/src/absl/time/clock_test.cc
@@ -0,0 +1,118 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/time/clock.h"
+
+#include "absl/base/config.h"
+#if defined(ABSL_HAVE_ALARM)
+#include <signal.h>
+#include <unistd.h>
+#elif defined(__linux__) || defined(__APPLE__)
+#error all known Linux and Apple targets have alarm
+#endif
+
+#include "gtest/gtest.h"
+#include "absl/time/time.h"
+
+namespace {
+
+TEST(Time, Now) {
+ const absl::Time before = absl::FromUnixNanos(absl::GetCurrentTimeNanos());
+ const absl::Time now = absl::Now();
+ const absl::Time after = absl::FromUnixNanos(absl::GetCurrentTimeNanos());
+ EXPECT_GE(now, before);
+ EXPECT_GE(after, now);
+}
+
+enum class AlarmPolicy { kWithoutAlarm, kWithAlarm };
+
+#if defined(ABSL_HAVE_ALARM)
+bool alarm_handler_invoked = false;
+
+void AlarmHandler(int signo) {
+ ASSERT_EQ(signo, SIGALRM);
+ alarm_handler_invoked = true;
+}
+#endif
+
+// Does SleepFor(d) take between lower_bound and upper_bound at least
+// once between now and (now + timeout)? If requested (and supported),
+// add an alarm for the middle of the sleep period and expect it to fire.
+bool SleepForBounded(absl::Duration d, absl::Duration lower_bound,
+ absl::Duration upper_bound, absl::Duration timeout,
+ AlarmPolicy alarm_policy, int* attempts) {
+ const absl::Time deadline = absl::Now() + timeout;
+ while (absl::Now() < deadline) {
+#if defined(ABSL_HAVE_ALARM)
+ sig_t old_alarm = SIG_DFL;
+ if (alarm_policy == AlarmPolicy::kWithAlarm) {
+ alarm_handler_invoked = false;
+ old_alarm = signal(SIGALRM, AlarmHandler);
+ alarm(absl::ToInt64Seconds(d / 2));
+ }
+#else
+ EXPECT_EQ(alarm_policy, AlarmPolicy::kWithoutAlarm);
+#endif
+ ++*attempts;
+ absl::Time start = absl::Now();
+ absl::SleepFor(d);
+ absl::Duration actual = absl::Now() - start;
+#if defined(ABSL_HAVE_ALARM)
+ if (alarm_policy == AlarmPolicy::kWithAlarm) {
+ signal(SIGALRM, old_alarm);
+ if (!alarm_handler_invoked) continue;
+ }
+#endif
+ if (lower_bound <= actual && actual <= upper_bound) {
+ return true; // yes, the SleepFor() was correctly bounded
+ }
+ }
+ return false;
+}
+
+testing::AssertionResult AssertSleepForBounded(absl::Duration d,
+ absl::Duration early,
+ absl::Duration late,
+ absl::Duration timeout,
+ AlarmPolicy alarm_policy) {
+ const absl::Duration lower_bound = d - early;
+ const absl::Duration upper_bound = d + late;
+ int attempts = 0;
+ if (SleepForBounded(d, lower_bound, upper_bound, timeout, alarm_policy,
+ &attempts)) {
+ return testing::AssertionSuccess();
+ }
+ return testing::AssertionFailure()
+ << "SleepFor(" << d << ") did not return within [" << lower_bound
+ << ":" << upper_bound << "] in " << attempts << " attempt"
+ << (attempts == 1 ? "" : "s") << " over " << timeout
+ << (alarm_policy == AlarmPolicy::kWithAlarm ? " with" : " without")
+ << " an alarm";
+}
+
+// Tests that SleepFor() returns neither too early nor too late.
+TEST(SleepFor, Bounded) {
+ const absl::Duration d = absl::Milliseconds(2500);
+ const absl::Duration early = absl::Milliseconds(100);
+ const absl::Duration late = absl::Milliseconds(300);
+ const absl::Duration timeout = 48 * d;
+ EXPECT_TRUE(AssertSleepForBounded(d, early, late, timeout,
+ AlarmPolicy::kWithoutAlarm));
+#if defined(ABSL_HAVE_ALARM)
+ EXPECT_TRUE(AssertSleepForBounded(d, early, late, timeout,
+ AlarmPolicy::kWithAlarm));
+#endif
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/time/duration.cc b/third_party/abseil/src/absl/time/duration.cc
new file mode 100644
index 0000000..4443109
--- /dev/null
+++ b/third_party/abseil/src/absl/time/duration.cc
@@ -0,0 +1,954 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// The implementation of the absl::Duration class, which is declared in
+// //absl/time.h. This class behaves like a numeric type; it has no public
+// methods and is used only through the operators defined here.
+//
+// Implementation notes:
+//
+// An absl::Duration is represented as
+//
+// rep_hi_ : (int64_t) Whole seconds
+// rep_lo_ : (uint32_t) Fractions of a second
+//
+// The seconds value (rep_hi_) may be positive or negative as appropriate.
+// The fractional seconds (rep_lo_) is always a positive offset from rep_hi_.
+// The API for Duration guarantees at least nanosecond resolution, which
+// means rep_lo_ could have a max value of 1B - 1 if it stored nanoseconds.
+// However, to utilize more of the available 32 bits of space in rep_lo_,
+// we instead store quarters of a nanosecond in rep_lo_ resulting in a max
+// value of 4B - 1. This allows us to correctly handle calculations like
+// 0.5 nanos + 0.5 nanos = 1 nano. The following example shows the actual
+// Duration rep using quarters of a nanosecond.
+//
+// 2.5 sec = {rep_hi_=2, rep_lo_=2000000000} // lo = 4 * 500000000
+// -2.5 sec = {rep_hi_=-3, rep_lo_=2000000000}
+//
+// Infinite durations are represented as Durations with the rep_lo_ field set
+// to all 1s.
+//
+// +InfiniteDuration:
+// rep_hi_ : kint64max
+// rep_lo_ : ~0U
+//
+// -InfiniteDuration:
+// rep_hi_ : kint64min
+// rep_lo_ : ~0U
+//
+// Arithmetic overflows/underflows to +/- infinity and saturates.
+
+#if defined(_MSC_VER)
+#include <winsock2.h> // for timeval
+#endif
+
+#include <algorithm>
+#include <cassert>
+#include <cctype>
+#include <cerrno>
+#include <cmath>
+#include <cstdint>
+#include <cstdlib>
+#include <cstring>
+#include <ctime>
+#include <functional>
+#include <limits>
+#include <string>
+
+#include "absl/base/casts.h"
+#include "absl/base/macros.h"
+#include "absl/numeric/int128.h"
+#include "absl/strings/string_view.h"
+#include "absl/strings/strip.h"
+#include "absl/time/time.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+namespace {
+
+using time_internal::kTicksPerNanosecond;
+using time_internal::kTicksPerSecond;
+
+constexpr int64_t kint64max = std::numeric_limits<int64_t>::max();
+constexpr int64_t kint64min = std::numeric_limits<int64_t>::min();
+
+// Can't use std::isinfinite() because it doesn't exist on windows.
+inline bool IsFinite(double d) {
+ if (std::isnan(d)) return false;
+ return d != std::numeric_limits<double>::infinity() &&
+ d != -std::numeric_limits<double>::infinity();
+}
+
+inline bool IsValidDivisor(double d) {
+ if (std::isnan(d)) return false;
+ return d != 0.0;
+}
+
+// Can't use std::round() because it is only available in C++11.
+// Note that we ignore the possibility of floating-point over/underflow.
+template <typename Double>
+inline double Round(Double d) {
+ return d < 0 ? std::ceil(d - 0.5) : std::floor(d + 0.5);
+}
+
+// *sec may be positive or negative. *ticks must be in the range
+// -kTicksPerSecond < *ticks < kTicksPerSecond. If *ticks is negative it
+// will be normalized to a positive value by adjusting *sec accordingly.
+inline void NormalizeTicks(int64_t* sec, int64_t* ticks) {
+ if (*ticks < 0) {
+ --*sec;
+ *ticks += kTicksPerSecond;
+ }
+}
+
+// Makes a uint128 from the absolute value of the given scalar.
+inline uint128 MakeU128(int64_t a) {
+ uint128 u128 = 0;
+ if (a < 0) {
+ ++u128;
+ ++a; // Makes it safe to negate 'a'
+ a = -a;
+ }
+ u128 += static_cast<uint64_t>(a);
+ return u128;
+}
+
+// Makes a uint128 count of ticks out of the absolute value of the Duration.
+inline uint128 MakeU128Ticks(Duration d) {
+ int64_t rep_hi = time_internal::GetRepHi(d);
+ uint32_t rep_lo = time_internal::GetRepLo(d);
+ if (rep_hi < 0) {
+ ++rep_hi;
+ rep_hi = -rep_hi;
+ rep_lo = kTicksPerSecond - rep_lo;
+ }
+ uint128 u128 = static_cast<uint64_t>(rep_hi);
+ u128 *= static_cast<uint64_t>(kTicksPerSecond);
+ u128 += rep_lo;
+ return u128;
+}
+
+// Breaks a uint128 of ticks into a Duration.
+inline Duration MakeDurationFromU128(uint128 u128, bool is_neg) {
+ int64_t rep_hi;
+ uint32_t rep_lo;
+ const uint64_t h64 = Uint128High64(u128);
+ const uint64_t l64 = Uint128Low64(u128);
+ if (h64 == 0) { // fastpath
+ const uint64_t hi = l64 / kTicksPerSecond;
+ rep_hi = static_cast<int64_t>(hi);
+ rep_lo = static_cast<uint32_t>(l64 - hi * kTicksPerSecond);
+ } else {
+ // kMaxRepHi64 is the high 64 bits of (2^63 * kTicksPerSecond).
+ // Any positive tick count whose high 64 bits are >= kMaxRepHi64
+ // is not representable as a Duration. A negative tick count can
+ // have its high 64 bits == kMaxRepHi64 but only when the low 64
+ // bits are all zero, otherwise it is not representable either.
+ const uint64_t kMaxRepHi64 = 0x77359400UL;
+ if (h64 >= kMaxRepHi64) {
+ if (is_neg && h64 == kMaxRepHi64 && l64 == 0) {
+ // Avoid trying to represent -kint64min below.
+ return time_internal::MakeDuration(kint64min);
+ }
+ return is_neg ? -InfiniteDuration() : InfiniteDuration();
+ }
+ const uint128 kTicksPerSecond128 = static_cast<uint64_t>(kTicksPerSecond);
+ const uint128 hi = u128 / kTicksPerSecond128;
+ rep_hi = static_cast<int64_t>(Uint128Low64(hi));
+ rep_lo =
+ static_cast<uint32_t>(Uint128Low64(u128 - hi * kTicksPerSecond128));
+ }
+ if (is_neg) {
+ rep_hi = -rep_hi;
+ if (rep_lo != 0) {
+ --rep_hi;
+ rep_lo = kTicksPerSecond - rep_lo;
+ }
+ }
+ return time_internal::MakeDuration(rep_hi, rep_lo);
+}
+
+// Convert between int64_t and uint64_t, preserving representation. This
+// allows us to do arithmetic in the unsigned domain, where overflow has
+// well-defined behavior. See operator+=() and operator-=().
+//
+// C99 7.20.1.1.1, as referenced by C++11 18.4.1.2, says, "The typedef
+// name intN_t designates a signed integer type with width N, no padding
+// bits, and a two's complement representation." So, we can convert to
+// and from the corresponding uint64_t value using a bit cast.
+inline uint64_t EncodeTwosComp(int64_t v) {
+ return absl::bit_cast<uint64_t>(v);
+}
+inline int64_t DecodeTwosComp(uint64_t v) { return absl::bit_cast<int64_t>(v); }
+
+// Note: The overflow detection in this function is done using greater/less *or
+// equal* because kint64max/min is too large to be represented exactly in a
+// double (which only has 53 bits of precision). In order to avoid assigning to
+// rep->hi a double value that is too large for an int64_t (and therefore is
+// undefined), we must consider computations that equal kint64max/min as a
+// double as overflow cases.
+inline bool SafeAddRepHi(double a_hi, double b_hi, Duration* d) {
+ double c = a_hi + b_hi;
+ if (c >= static_cast<double>(kint64max)) {
+ *d = InfiniteDuration();
+ return false;
+ }
+ if (c <= static_cast<double>(kint64min)) {
+ *d = -InfiniteDuration();
+ return false;
+ }
+ *d = time_internal::MakeDuration(c, time_internal::GetRepLo(*d));
+ return true;
+}
+
+// A functor that's similar to std::multiplies<T>, except this returns the max
+// T value instead of overflowing. This is only defined for uint128.
+template <typename Ignored>
+struct SafeMultiply {
+ uint128 operator()(uint128 a, uint128 b) const {
+ // b hi is always zero because it originated as an int64_t.
+ assert(Uint128High64(b) == 0);
+ // Fastpath to avoid the expensive overflow check with division.
+ if (Uint128High64(a) == 0) {
+ return (((Uint128Low64(a) | Uint128Low64(b)) >> 32) == 0)
+ ? static_cast<uint128>(Uint128Low64(a) * Uint128Low64(b))
+ : a * b;
+ }
+ return b == 0 ? b : (a > kuint128max / b) ? kuint128max : a * b;
+ }
+};
+
+// Scales (i.e., multiplies or divides, depending on the Operation template)
+// the Duration d by the int64_t r.
+template <template <typename> class Operation>
+inline Duration ScaleFixed(Duration d, int64_t r) {
+ const uint128 a = MakeU128Ticks(d);
+ const uint128 b = MakeU128(r);
+ const uint128 q = Operation<uint128>()(a, b);
+ const bool is_neg = (time_internal::GetRepHi(d) < 0) != (r < 0);
+ return MakeDurationFromU128(q, is_neg);
+}
+
+// Scales (i.e., multiplies or divides, depending on the Operation template)
+// the Duration d by the double r.
+template <template <typename> class Operation>
+inline Duration ScaleDouble(Duration d, double r) {
+ Operation<double> op;
+ double hi_doub = op(time_internal::GetRepHi(d), r);
+ double lo_doub = op(time_internal::GetRepLo(d), r);
+
+ double hi_int = 0;
+ double hi_frac = std::modf(hi_doub, &hi_int);
+
+ // Moves hi's fractional bits to lo.
+ lo_doub /= kTicksPerSecond;
+ lo_doub += hi_frac;
+
+ double lo_int = 0;
+ double lo_frac = std::modf(lo_doub, &lo_int);
+
+ // Rolls lo into hi if necessary.
+ int64_t lo64 = Round(lo_frac * kTicksPerSecond);
+
+ Duration ans;
+ if (!SafeAddRepHi(hi_int, lo_int, &ans)) return ans;
+ int64_t hi64 = time_internal::GetRepHi(ans);
+ if (!SafeAddRepHi(hi64, lo64 / kTicksPerSecond, &ans)) return ans;
+ hi64 = time_internal::GetRepHi(ans);
+ lo64 %= kTicksPerSecond;
+ NormalizeTicks(&hi64, &lo64);
+ return time_internal::MakeDuration(hi64, lo64);
+}
+
+// Tries to divide num by den as fast as possible by looking for common, easy
+// cases. If the division was done, the quotient is in *q and the remainder is
+// in *rem and true will be returned.
+inline bool IDivFastPath(const Duration num, const Duration den, int64_t* q,
+ Duration* rem) {
+ // Bail if num or den is an infinity.
+ if (time_internal::IsInfiniteDuration(num) ||
+ time_internal::IsInfiniteDuration(den))
+ return false;
+
+ int64_t num_hi = time_internal::GetRepHi(num);
+ uint32_t num_lo = time_internal::GetRepLo(num);
+ int64_t den_hi = time_internal::GetRepHi(den);
+ uint32_t den_lo = time_internal::GetRepLo(den);
+
+ if (den_hi == 0 && den_lo == kTicksPerNanosecond) {
+ // Dividing by 1ns
+ if (num_hi >= 0 && num_hi < (kint64max - kTicksPerSecond) / 1000000000) {
+ *q = num_hi * 1000000000 + num_lo / kTicksPerNanosecond;
+ *rem = time_internal::MakeDuration(0, num_lo % den_lo);
+ return true;
+ }
+ } else if (den_hi == 0 && den_lo == 100 * kTicksPerNanosecond) {
+ // Dividing by 100ns (common when converting to Universal time)
+ if (num_hi >= 0 && num_hi < (kint64max - kTicksPerSecond) / 10000000) {
+ *q = num_hi * 10000000 + num_lo / (100 * kTicksPerNanosecond);
+ *rem = time_internal::MakeDuration(0, num_lo % den_lo);
+ return true;
+ }
+ } else if (den_hi == 0 && den_lo == 1000 * kTicksPerNanosecond) {
+ // Dividing by 1us
+ if (num_hi >= 0 && num_hi < (kint64max - kTicksPerSecond) / 1000000) {
+ *q = num_hi * 1000000 + num_lo / (1000 * kTicksPerNanosecond);
+ *rem = time_internal::MakeDuration(0, num_lo % den_lo);
+ return true;
+ }
+ } else if (den_hi == 0 && den_lo == 1000000 * kTicksPerNanosecond) {
+ // Dividing by 1ms
+ if (num_hi >= 0 && num_hi < (kint64max - kTicksPerSecond) / 1000) {
+ *q = num_hi * 1000 + num_lo / (1000000 * kTicksPerNanosecond);
+ *rem = time_internal::MakeDuration(0, num_lo % den_lo);
+ return true;
+ }
+ } else if (den_hi > 0 && den_lo == 0) {
+ // Dividing by positive multiple of 1s
+ if (num_hi >= 0) {
+ if (den_hi == 1) {
+ *q = num_hi;
+ *rem = time_internal::MakeDuration(0, num_lo);
+ return true;
+ }
+ *q = num_hi / den_hi;
+ *rem = time_internal::MakeDuration(num_hi % den_hi, num_lo);
+ return true;
+ }
+ if (num_lo != 0) {
+ num_hi += 1;
+ }
+ int64_t quotient = num_hi / den_hi;
+ int64_t rem_sec = num_hi % den_hi;
+ if (rem_sec > 0) {
+ rem_sec -= den_hi;
+ quotient += 1;
+ }
+ if (num_lo != 0) {
+ rem_sec -= 1;
+ }
+ *q = quotient;
+ *rem = time_internal::MakeDuration(rem_sec, num_lo);
+ return true;
+ }
+
+ return false;
+}
+
+} // namespace
+
+namespace time_internal {
+
+// The 'satq' argument indicates whether the quotient should saturate at the
+// bounds of int64_t. If it does saturate, the difference will spill over to
+// the remainder. If it does not saturate, the remainder remain accurate,
+// but the returned quotient will over/underflow int64_t and should not be used.
+int64_t IDivDuration(bool satq, const Duration num, const Duration den,
+ Duration* rem) {
+ int64_t q = 0;
+ if (IDivFastPath(num, den, &q, rem)) {
+ return q;
+ }
+
+ const bool num_neg = num < ZeroDuration();
+ const bool den_neg = den < ZeroDuration();
+ const bool quotient_neg = num_neg != den_neg;
+
+ if (time_internal::IsInfiniteDuration(num) || den == ZeroDuration()) {
+ *rem = num_neg ? -InfiniteDuration() : InfiniteDuration();
+ return quotient_neg ? kint64min : kint64max;
+ }
+ if (time_internal::IsInfiniteDuration(den)) {
+ *rem = num;
+ return 0;
+ }
+
+ const uint128 a = MakeU128Ticks(num);
+ const uint128 b = MakeU128Ticks(den);
+ uint128 quotient128 = a / b;
+
+ if (satq) {
+ // Limits the quotient to the range of int64_t.
+ if (quotient128 > uint128(static_cast<uint64_t>(kint64max))) {
+ quotient128 = quotient_neg ? uint128(static_cast<uint64_t>(kint64min))
+ : uint128(static_cast<uint64_t>(kint64max));
+ }
+ }
+
+ const uint128 remainder128 = a - quotient128 * b;
+ *rem = MakeDurationFromU128(remainder128, num_neg);
+
+ if (!quotient_neg || quotient128 == 0) {
+ return Uint128Low64(quotient128) & kint64max;
+ }
+ // The quotient needs to be negated, but we need to carefully handle
+ // quotient128s with the top bit on.
+ return -static_cast<int64_t>(Uint128Low64(quotient128 - 1) & kint64max) - 1;
+}
+
+} // namespace time_internal
+
+//
+// Additive operators.
+//
+
+Duration& Duration::operator+=(Duration rhs) {
+ if (time_internal::IsInfiniteDuration(*this)) return *this;
+ if (time_internal::IsInfiniteDuration(rhs)) return *this = rhs;
+ const int64_t orig_rep_hi = rep_hi_;
+ rep_hi_ =
+ DecodeTwosComp(EncodeTwosComp(rep_hi_) + EncodeTwosComp(rhs.rep_hi_));
+ if (rep_lo_ >= kTicksPerSecond - rhs.rep_lo_) {
+ rep_hi_ = DecodeTwosComp(EncodeTwosComp(rep_hi_) + 1);
+ rep_lo_ -= kTicksPerSecond;
+ }
+ rep_lo_ += rhs.rep_lo_;
+ if (rhs.rep_hi_ < 0 ? rep_hi_ > orig_rep_hi : rep_hi_ < orig_rep_hi) {
+ return *this = rhs.rep_hi_ < 0 ? -InfiniteDuration() : InfiniteDuration();
+ }
+ return *this;
+}
+
+Duration& Duration::operator-=(Duration rhs) {
+ if (time_internal::IsInfiniteDuration(*this)) return *this;
+ if (time_internal::IsInfiniteDuration(rhs)) {
+ return *this = rhs.rep_hi_ >= 0 ? -InfiniteDuration() : InfiniteDuration();
+ }
+ const int64_t orig_rep_hi = rep_hi_;
+ rep_hi_ =
+ DecodeTwosComp(EncodeTwosComp(rep_hi_) - EncodeTwosComp(rhs.rep_hi_));
+ if (rep_lo_ < rhs.rep_lo_) {
+ rep_hi_ = DecodeTwosComp(EncodeTwosComp(rep_hi_) - 1);
+ rep_lo_ += kTicksPerSecond;
+ }
+ rep_lo_ -= rhs.rep_lo_;
+ if (rhs.rep_hi_ < 0 ? rep_hi_ < orig_rep_hi : rep_hi_ > orig_rep_hi) {
+ return *this = rhs.rep_hi_ >= 0 ? -InfiniteDuration() : InfiniteDuration();
+ }
+ return *this;
+}
+
+//
+// Multiplicative operators.
+//
+
+Duration& Duration::operator*=(int64_t r) {
+ if (time_internal::IsInfiniteDuration(*this)) {
+ const bool is_neg = (r < 0) != (rep_hi_ < 0);
+ return *this = is_neg ? -InfiniteDuration() : InfiniteDuration();
+ }
+ return *this = ScaleFixed<SafeMultiply>(*this, r);
+}
+
+Duration& Duration::operator*=(double r) {
+ if (time_internal::IsInfiniteDuration(*this) || !IsFinite(r)) {
+ const bool is_neg = (std::signbit(r) != 0) != (rep_hi_ < 0);
+ return *this = is_neg ? -InfiniteDuration() : InfiniteDuration();
+ }
+ return *this = ScaleDouble<std::multiplies>(*this, r);
+}
+
+Duration& Duration::operator/=(int64_t r) {
+ if (time_internal::IsInfiniteDuration(*this) || r == 0) {
+ const bool is_neg = (r < 0) != (rep_hi_ < 0);
+ return *this = is_neg ? -InfiniteDuration() : InfiniteDuration();
+ }
+ return *this = ScaleFixed<std::divides>(*this, r);
+}
+
+Duration& Duration::operator/=(double r) {
+ if (time_internal::IsInfiniteDuration(*this) || !IsValidDivisor(r)) {
+ const bool is_neg = (std::signbit(r) != 0) != (rep_hi_ < 0);
+ return *this = is_neg ? -InfiniteDuration() : InfiniteDuration();
+ }
+ return *this = ScaleDouble<std::divides>(*this, r);
+}
+
+Duration& Duration::operator%=(Duration rhs) {
+ time_internal::IDivDuration(false, *this, rhs, this);
+ return *this;
+}
+
+double FDivDuration(Duration num, Duration den) {
+ // Arithmetic with infinity is sticky.
+ if (time_internal::IsInfiniteDuration(num) || den == ZeroDuration()) {
+ return (num < ZeroDuration()) == (den < ZeroDuration())
+ ? std::numeric_limits<double>::infinity()
+ : -std::numeric_limits<double>::infinity();
+ }
+ if (time_internal::IsInfiniteDuration(den)) return 0.0;
+
+ double a =
+ static_cast<double>(time_internal::GetRepHi(num)) * kTicksPerSecond +
+ time_internal::GetRepLo(num);
+ double b =
+ static_cast<double>(time_internal::GetRepHi(den)) * kTicksPerSecond +
+ time_internal::GetRepLo(den);
+ return a / b;
+}
+
+//
+// Trunc/Floor/Ceil.
+//
+
+Duration Trunc(Duration d, Duration unit) {
+ return d - (d % unit);
+}
+
+Duration Floor(const Duration d, const Duration unit) {
+ const absl::Duration td = Trunc(d, unit);
+ return td <= d ? td : td - AbsDuration(unit);
+}
+
+Duration Ceil(const Duration d, const Duration unit) {
+ const absl::Duration td = Trunc(d, unit);
+ return td >= d ? td : td + AbsDuration(unit);
+}
+
+//
+// Factory functions.
+//
+
+Duration DurationFromTimespec(timespec ts) {
+ if (static_cast<uint64_t>(ts.tv_nsec) < 1000 * 1000 * 1000) {
+ int64_t ticks = ts.tv_nsec * kTicksPerNanosecond;
+ return time_internal::MakeDuration(ts.tv_sec, ticks);
+ }
+ return Seconds(ts.tv_sec) + Nanoseconds(ts.tv_nsec);
+}
+
+Duration DurationFromTimeval(timeval tv) {
+ if (static_cast<uint64_t>(tv.tv_usec) < 1000 * 1000) {
+ int64_t ticks = tv.tv_usec * 1000 * kTicksPerNanosecond;
+ return time_internal::MakeDuration(tv.tv_sec, ticks);
+ }
+ return Seconds(tv.tv_sec) + Microseconds(tv.tv_usec);
+}
+
+//
+// Conversion to other duration types.
+//
+
+int64_t ToInt64Nanoseconds(Duration d) {
+ if (time_internal::GetRepHi(d) >= 0 &&
+ time_internal::GetRepHi(d) >> 33 == 0) {
+ return (time_internal::GetRepHi(d) * 1000 * 1000 * 1000) +
+ (time_internal::GetRepLo(d) / kTicksPerNanosecond);
+ }
+ return d / Nanoseconds(1);
+}
+int64_t ToInt64Microseconds(Duration d) {
+ if (time_internal::GetRepHi(d) >= 0 &&
+ time_internal::GetRepHi(d) >> 43 == 0) {
+ return (time_internal::GetRepHi(d) * 1000 * 1000) +
+ (time_internal::GetRepLo(d) / (kTicksPerNanosecond * 1000));
+ }
+ return d / Microseconds(1);
+}
+int64_t ToInt64Milliseconds(Duration d) {
+ if (time_internal::GetRepHi(d) >= 0 &&
+ time_internal::GetRepHi(d) >> 53 == 0) {
+ return (time_internal::GetRepHi(d) * 1000) +
+ (time_internal::GetRepLo(d) / (kTicksPerNanosecond * 1000 * 1000));
+ }
+ return d / Milliseconds(1);
+}
+int64_t ToInt64Seconds(Duration d) {
+ int64_t hi = time_internal::GetRepHi(d);
+ if (time_internal::IsInfiniteDuration(d)) return hi;
+ if (hi < 0 && time_internal::GetRepLo(d) != 0) ++hi;
+ return hi;
+}
+int64_t ToInt64Minutes(Duration d) {
+ int64_t hi = time_internal::GetRepHi(d);
+ if (time_internal::IsInfiniteDuration(d)) return hi;
+ if (hi < 0 && time_internal::GetRepLo(d) != 0) ++hi;
+ return hi / 60;
+}
+int64_t ToInt64Hours(Duration d) {
+ int64_t hi = time_internal::GetRepHi(d);
+ if (time_internal::IsInfiniteDuration(d)) return hi;
+ if (hi < 0 && time_internal::GetRepLo(d) != 0) ++hi;
+ return hi / (60 * 60);
+}
+
+double ToDoubleNanoseconds(Duration d) {
+ return FDivDuration(d, Nanoseconds(1));
+}
+double ToDoubleMicroseconds(Duration d) {
+ return FDivDuration(d, Microseconds(1));
+}
+double ToDoubleMilliseconds(Duration d) {
+ return FDivDuration(d, Milliseconds(1));
+}
+double ToDoubleSeconds(Duration d) {
+ return FDivDuration(d, Seconds(1));
+}
+double ToDoubleMinutes(Duration d) {
+ return FDivDuration(d, Minutes(1));
+}
+double ToDoubleHours(Duration d) {
+ return FDivDuration(d, Hours(1));
+}
+
+timespec ToTimespec(Duration d) {
+ timespec ts;
+ if (!time_internal::IsInfiniteDuration(d)) {
+ int64_t rep_hi = time_internal::GetRepHi(d);
+ uint32_t rep_lo = time_internal::GetRepLo(d);
+ if (rep_hi < 0) {
+ // Tweak the fields so that unsigned division of rep_lo
+ // maps to truncation (towards zero) for the timespec.
+ rep_lo += kTicksPerNanosecond - 1;
+ if (rep_lo >= kTicksPerSecond) {
+ rep_hi += 1;
+ rep_lo -= kTicksPerSecond;
+ }
+ }
+ ts.tv_sec = rep_hi;
+ if (ts.tv_sec == rep_hi) { // no time_t narrowing
+ ts.tv_nsec = rep_lo / kTicksPerNanosecond;
+ return ts;
+ }
+ }
+ if (d >= ZeroDuration()) {
+ ts.tv_sec = std::numeric_limits<time_t>::max();
+ ts.tv_nsec = 1000 * 1000 * 1000 - 1;
+ } else {
+ ts.tv_sec = std::numeric_limits<time_t>::min();
+ ts.tv_nsec = 0;
+ }
+ return ts;
+}
+
+timeval ToTimeval(Duration d) {
+ timeval tv;
+ timespec ts = ToTimespec(d);
+ if (ts.tv_sec < 0) {
+ // Tweak the fields so that positive division of tv_nsec
+ // maps to truncation (towards zero) for the timeval.
+ ts.tv_nsec += 1000 - 1;
+ if (ts.tv_nsec >= 1000 * 1000 * 1000) {
+ ts.tv_sec += 1;
+ ts.tv_nsec -= 1000 * 1000 * 1000;
+ }
+ }
+ tv.tv_sec = ts.tv_sec;
+ if (tv.tv_sec != ts.tv_sec) { // narrowing
+ if (ts.tv_sec < 0) {
+ tv.tv_sec = std::numeric_limits<decltype(tv.tv_sec)>::min();
+ tv.tv_usec = 0;
+ } else {
+ tv.tv_sec = std::numeric_limits<decltype(tv.tv_sec)>::max();
+ tv.tv_usec = 1000 * 1000 - 1;
+ }
+ return tv;
+ }
+ tv.tv_usec = static_cast<int>(ts.tv_nsec / 1000); // suseconds_t
+ return tv;
+}
+
+std::chrono::nanoseconds ToChronoNanoseconds(Duration d) {
+ return time_internal::ToChronoDuration<std::chrono::nanoseconds>(d);
+}
+std::chrono::microseconds ToChronoMicroseconds(Duration d) {
+ return time_internal::ToChronoDuration<std::chrono::microseconds>(d);
+}
+std::chrono::milliseconds ToChronoMilliseconds(Duration d) {
+ return time_internal::ToChronoDuration<std::chrono::milliseconds>(d);
+}
+std::chrono::seconds ToChronoSeconds(Duration d) {
+ return time_internal::ToChronoDuration<std::chrono::seconds>(d);
+}
+std::chrono::minutes ToChronoMinutes(Duration d) {
+ return time_internal::ToChronoDuration<std::chrono::minutes>(d);
+}
+std::chrono::hours ToChronoHours(Duration d) {
+ return time_internal::ToChronoDuration<std::chrono::hours>(d);
+}
+
+//
+// To/From string formatting.
+//
+
+namespace {
+
+// Formats a positive 64-bit integer in the given field width. Note that
+// it is up to the caller of Format64() to ensure that there is sufficient
+// space before ep to hold the conversion.
+char* Format64(char* ep, int width, int64_t v) {
+ do {
+ --width;
+ *--ep = '0' + (v % 10); // contiguous digits
+ } while (v /= 10);
+ while (--width >= 0) *--ep = '0'; // zero pad
+ return ep;
+}
+
+// Helpers for FormatDuration() that format 'n' and append it to 'out'
+// followed by the given 'unit'. If 'n' formats to "0", nothing is
+// appended (not even the unit).
+
+// A type that encapsulates how to display a value of a particular unit. For
+// values that are displayed with fractional parts, the precision indicates
+// where to round the value. The precision varies with the display unit because
+// a Duration can hold only quarters of a nanosecond, so displaying information
+// beyond that is just noise.
+//
+// For example, a microsecond value of 42.00025xxxxx should not display beyond 5
+// fractional digits, because it is in the noise of what a Duration can
+// represent.
+struct DisplayUnit {
+ absl::string_view abbr;
+ int prec;
+ double pow10;
+};
+ABSL_CONST_INIT const DisplayUnit kDisplayNano = {"ns", 2, 1e2};
+ABSL_CONST_INIT const DisplayUnit kDisplayMicro = {"us", 5, 1e5};
+ABSL_CONST_INIT const DisplayUnit kDisplayMilli = {"ms", 8, 1e8};
+ABSL_CONST_INIT const DisplayUnit kDisplaySec = {"s", 11, 1e11};
+ABSL_CONST_INIT const DisplayUnit kDisplayMin = {"m", -1, 0.0}; // prec ignored
+ABSL_CONST_INIT const DisplayUnit kDisplayHour = {"h", -1,
+ 0.0}; // prec ignored
+
+void AppendNumberUnit(std::string* out, int64_t n, DisplayUnit unit) {
+ char buf[sizeof("2562047788015216")]; // hours in max duration
+ char* const ep = buf + sizeof(buf);
+ char* bp = Format64(ep, 0, n);
+ if (*bp != '0' || bp + 1 != ep) {
+ out->append(bp, ep - bp);
+ out->append(unit.abbr.data(), unit.abbr.size());
+ }
+}
+
+// Note: unit.prec is limited to double's digits10 value (typically 15) so it
+// always fits in buf[].
+void AppendNumberUnit(std::string* out, double n, DisplayUnit unit) {
+ constexpr int kBufferSize = std::numeric_limits<double>::digits10;
+ const int prec = std::min(kBufferSize, unit.prec);
+ char buf[kBufferSize]; // also large enough to hold integer part
+ char* ep = buf + sizeof(buf);
+ double d = 0;
+ int64_t frac_part = Round(std::modf(n, &d) * unit.pow10);
+ int64_t int_part = d;
+ if (int_part != 0 || frac_part != 0) {
+ char* bp = Format64(ep, 0, int_part); // always < 1000
+ out->append(bp, ep - bp);
+ if (frac_part != 0) {
+ out->push_back('.');
+ bp = Format64(ep, prec, frac_part);
+ while (ep[-1] == '0') --ep;
+ out->append(bp, ep - bp);
+ }
+ out->append(unit.abbr.data(), unit.abbr.size());
+ }
+}
+
+} // namespace
+
+// From Go's doc at https://golang.org/pkg/time/#Duration.String
+// [FormatDuration] returns a string representing the duration in the
+// form "72h3m0.5s". Leading zero units are omitted. As a special
+// case, durations less than one second format use a smaller unit
+// (milli-, micro-, or nanoseconds) to ensure that the leading digit
+// is non-zero.
+// Unlike Go, we format the zero duration as 0, with no unit.
+std::string FormatDuration(Duration d) {
+ const Duration min_duration = Seconds(kint64min);
+ if (d == min_duration) {
+ // Avoid needing to negate kint64min by directly returning what the
+ // following code should produce in that case.
+ return "-2562047788015215h30m8s";
+ }
+ std::string s;
+ if (d < ZeroDuration()) {
+ s.append("-");
+ d = -d;
+ }
+ if (d == InfiniteDuration()) {
+ s.append("inf");
+ } else if (d < Seconds(1)) {
+ // Special case for durations with a magnitude < 1 second. The duration
+ // is printed as a fraction of a single unit, e.g., "1.2ms".
+ if (d < Microseconds(1)) {
+ AppendNumberUnit(&s, FDivDuration(d, Nanoseconds(1)), kDisplayNano);
+ } else if (d < Milliseconds(1)) {
+ AppendNumberUnit(&s, FDivDuration(d, Microseconds(1)), kDisplayMicro);
+ } else {
+ AppendNumberUnit(&s, FDivDuration(d, Milliseconds(1)), kDisplayMilli);
+ }
+ } else {
+ AppendNumberUnit(&s, IDivDuration(d, Hours(1), &d), kDisplayHour);
+ AppendNumberUnit(&s, IDivDuration(d, Minutes(1), &d), kDisplayMin);
+ AppendNumberUnit(&s, FDivDuration(d, Seconds(1)), kDisplaySec);
+ }
+ if (s.empty() || s == "-") {
+ s = "0";
+ }
+ return s;
+}
+
+namespace {
+
+// A helper for ParseDuration() that parses a leading number from the given
+// string and stores the result in *int_part/*frac_part/*frac_scale. The
+// given string pointer is modified to point to the first unconsumed char.
+bool ConsumeDurationNumber(const char** dpp, const char* ep, int64_t* int_part,
+ int64_t* frac_part, int64_t* frac_scale) {
+ *int_part = 0;
+ *frac_part = 0;
+ *frac_scale = 1; // invariant: *frac_part < *frac_scale
+ const char* start = *dpp;
+ for (; *dpp != ep; *dpp += 1) {
+ const int d = **dpp - '0'; // contiguous digits
+ if (d < 0 || 10 <= d) break;
+
+ if (*int_part > kint64max / 10) return false;
+ *int_part *= 10;
+ if (*int_part > kint64max - d) return false;
+ *int_part += d;
+ }
+ const bool int_part_empty = (*dpp == start);
+ if (*dpp == ep || **dpp != '.') return !int_part_empty;
+
+ for (*dpp += 1; *dpp != ep; *dpp += 1) {
+ const int d = **dpp - '0'; // contiguous digits
+ if (d < 0 || 10 <= d) break;
+ if (*frac_scale <= kint64max / 10) {
+ *frac_part *= 10;
+ *frac_part += d;
+ *frac_scale *= 10;
+ }
+ }
+ return !int_part_empty || *frac_scale != 1;
+}
+
+// A helper for ParseDuration() that parses a leading unit designator (e.g.,
+// ns, us, ms, s, m, h) from the given string and stores the resulting unit
+// in "*unit". The given string pointer is modified to point to the first
+// unconsumed char.
+bool ConsumeDurationUnit(const char** start, const char* end, Duration* unit) {
+ size_t size = end - *start;
+ switch (size) {
+ case 0:
+ return false;
+ default:
+ switch (**start) {
+ case 'n':
+ if (*(*start + 1) == 's') {
+ *start += 2;
+ *unit = Nanoseconds(1);
+ return true;
+ }
+ break;
+ case 'u':
+ if (*(*start + 1) == 's') {
+ *start += 2;
+ *unit = Microseconds(1);
+ return true;
+ }
+ break;
+ case 'm':
+ if (*(*start + 1) == 's') {
+ *start += 2;
+ *unit = Milliseconds(1);
+ return true;
+ }
+ break;
+ default:
+ break;
+ }
+ ABSL_FALLTHROUGH_INTENDED;
+ case 1:
+ switch (**start) {
+ case 's':
+ *unit = Seconds(1);
+ *start += 1;
+ return true;
+ case 'm':
+ *unit = Minutes(1);
+ *start += 1;
+ return true;
+ case 'h':
+ *unit = Hours(1);
+ *start += 1;
+ return true;
+ default:
+ return false;
+ }
+ }
+}
+
+} // namespace
+
+// From Go's doc at https://golang.org/pkg/time/#ParseDuration
+// [ParseDuration] parses a duration string. A duration string is
+// a possibly signed sequence of decimal numbers, each with optional
+// fraction and a unit suffix, such as "300ms", "-1.5h" or "2h45m".
+// Valid time units are "ns", "us" "ms", "s", "m", "h".
+bool ParseDuration(absl::string_view dur_sv, Duration* d) {
+ int sign = 1;
+ if (absl::ConsumePrefix(&dur_sv, "-")) {
+ sign = -1;
+ } else {
+ absl::ConsumePrefix(&dur_sv, "+");
+ }
+ if (dur_sv.empty()) return false;
+
+ // Special case for a string of "0".
+ if (dur_sv == "0") {
+ *d = ZeroDuration();
+ return true;
+ }
+
+ if (dur_sv == "inf") {
+ *d = sign * InfiniteDuration();
+ return true;
+ }
+
+ const char* start = dur_sv.data();
+ const char* end = start + dur_sv.size();
+
+ Duration dur;
+ while (start != end) {
+ int64_t int_part;
+ int64_t frac_part;
+ int64_t frac_scale;
+ Duration unit;
+ if (!ConsumeDurationNumber(&start, end, &int_part, &frac_part,
+ &frac_scale) ||
+ !ConsumeDurationUnit(&start, end, &unit)) {
+ return false;
+ }
+ if (int_part != 0) dur += sign * int_part * unit;
+ if (frac_part != 0) dur += sign * frac_part * unit / frac_scale;
+ }
+ *d = dur;
+ return true;
+}
+
+bool AbslParseFlag(absl::string_view text, Duration* dst, std::string*) {
+ return ParseDuration(text, dst);
+}
+
+std::string AbslUnparseFlag(Duration d) { return FormatDuration(d); }
+bool ParseFlag(const std::string& text, Duration* dst, std::string* ) {
+ return ParseDuration(text, dst);
+}
+
+std::string UnparseFlag(Duration d) { return FormatDuration(d); }
+
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/time/duration_benchmark.cc b/third_party/abseil/src/absl/time/duration_benchmark.cc
new file mode 100644
index 0000000..83a836c
--- /dev/null
+++ b/third_party/abseil/src/absl/time/duration_benchmark.cc
@@ -0,0 +1,428 @@
+// Copyright 2018 The Abseil Authors.
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <cmath>
+#include <cstddef>
+#include <cstdint>
+#include <ctime>
+#include <string>
+
+#include "absl/base/attributes.h"
+#include "absl/time/time.h"
+#include "benchmark/benchmark.h"
+
+namespace {
+
+//
+// Factory functions
+//
+
+void BM_Duration_Factory_Nanoseconds(benchmark::State& state) {
+ int64_t i = 0;
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(absl::Nanoseconds(i));
+ i += 314159;
+ }
+}
+BENCHMARK(BM_Duration_Factory_Nanoseconds);
+
+void BM_Duration_Factory_Microseconds(benchmark::State& state) {
+ int64_t i = 0;
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(absl::Microseconds(i));
+ i += 314;
+ }
+}
+BENCHMARK(BM_Duration_Factory_Microseconds);
+
+void BM_Duration_Factory_Milliseconds(benchmark::State& state) {
+ int64_t i = 0;
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(absl::Milliseconds(i));
+ i += 1;
+ }
+}
+BENCHMARK(BM_Duration_Factory_Milliseconds);
+
+void BM_Duration_Factory_Seconds(benchmark::State& state) {
+ int64_t i = 0;
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(absl::Seconds(i));
+ i += 1;
+ }
+}
+BENCHMARK(BM_Duration_Factory_Seconds);
+
+void BM_Duration_Factory_Minutes(benchmark::State& state) {
+ int64_t i = 0;
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(absl::Minutes(i));
+ i += 1;
+ }
+}
+BENCHMARK(BM_Duration_Factory_Minutes);
+
+void BM_Duration_Factory_Hours(benchmark::State& state) {
+ int64_t i = 0;
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(absl::Hours(i));
+ i += 1;
+ }
+}
+BENCHMARK(BM_Duration_Factory_Hours);
+
+void BM_Duration_Factory_DoubleNanoseconds(benchmark::State& state) {
+ double d = 1;
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(absl::Nanoseconds(d));
+ d = d * 1.00000001 + 1;
+ }
+}
+BENCHMARK(BM_Duration_Factory_DoubleNanoseconds);
+
+void BM_Duration_Factory_DoubleMicroseconds(benchmark::State& state) {
+ double d = 1e-3;
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(absl::Microseconds(d));
+ d = d * 1.00000001 + 1e-3;
+ }
+}
+BENCHMARK(BM_Duration_Factory_DoubleMicroseconds);
+
+void BM_Duration_Factory_DoubleMilliseconds(benchmark::State& state) {
+ double d = 1e-6;
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(absl::Milliseconds(d));
+ d = d * 1.00000001 + 1e-6;
+ }
+}
+BENCHMARK(BM_Duration_Factory_DoubleMilliseconds);
+
+void BM_Duration_Factory_DoubleSeconds(benchmark::State& state) {
+ double d = 1e-9;
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(absl::Seconds(d));
+ d = d * 1.00000001 + 1e-9;
+ }
+}
+BENCHMARK(BM_Duration_Factory_DoubleSeconds);
+
+void BM_Duration_Factory_DoubleMinutes(benchmark::State& state) {
+ double d = 1e-9;
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(absl::Minutes(d));
+ d = d * 1.00000001 + 1e-9;
+ }
+}
+BENCHMARK(BM_Duration_Factory_DoubleMinutes);
+
+void BM_Duration_Factory_DoubleHours(benchmark::State& state) {
+ double d = 1e-9;
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(absl::Hours(d));
+ d = d * 1.00000001 + 1e-9;
+ }
+}
+BENCHMARK(BM_Duration_Factory_DoubleHours);
+
+//
+// Arithmetic
+//
+
+void BM_Duration_Addition(benchmark::State& state) {
+ absl::Duration d = absl::Nanoseconds(1);
+ absl::Duration step = absl::Milliseconds(1);
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(d += step);
+ }
+}
+BENCHMARK(BM_Duration_Addition);
+
+void BM_Duration_Subtraction(benchmark::State& state) {
+ absl::Duration d = absl::Seconds(std::numeric_limits<int64_t>::max());
+ absl::Duration step = absl::Milliseconds(1);
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(d -= step);
+ }
+}
+BENCHMARK(BM_Duration_Subtraction);
+
+void BM_Duration_Multiplication_Fixed(benchmark::State& state) {
+ absl::Duration d = absl::Milliseconds(1);
+ absl::Duration s;
+ int i = 0;
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(s += d * (i + 1));
+ ++i;
+ }
+}
+BENCHMARK(BM_Duration_Multiplication_Fixed);
+
+void BM_Duration_Multiplication_Double(benchmark::State& state) {
+ absl::Duration d = absl::Milliseconds(1);
+ absl::Duration s;
+ int i = 0;
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(s += d * (i + 1.0));
+ ++i;
+ }
+}
+BENCHMARK(BM_Duration_Multiplication_Double);
+
+void BM_Duration_Division_Fixed(benchmark::State& state) {
+ absl::Duration d = absl::Seconds(1);
+ int i = 0;
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(d /= i + 1);
+ ++i;
+ }
+}
+BENCHMARK(BM_Duration_Division_Fixed);
+
+void BM_Duration_Division_Double(benchmark::State& state) {
+ absl::Duration d = absl::Seconds(1);
+ int i = 0;
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(d /= i + 1.0);
+ ++i;
+ }
+}
+BENCHMARK(BM_Duration_Division_Double);
+
+void BM_Duration_FDivDuration_Nanoseconds(benchmark::State& state) {
+ double d = 1;
+ int i = 0;
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(
+ d += absl::FDivDuration(absl::Milliseconds(i), absl::Nanoseconds(1)));
+ ++i;
+ }
+}
+BENCHMARK(BM_Duration_FDivDuration_Nanoseconds);
+
+void BM_Duration_IDivDuration_Nanoseconds(benchmark::State& state) {
+ int64_t a = 1;
+ absl::Duration ignore;
+ int i = 0;
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(a +=
+ absl::IDivDuration(absl::Nanoseconds(i),
+ absl::Nanoseconds(1), &ignore));
+ ++i;
+ }
+}
+BENCHMARK(BM_Duration_IDivDuration_Nanoseconds);
+
+void BM_Duration_IDivDuration_Microseconds(benchmark::State& state) {
+ int64_t a = 1;
+ absl::Duration ignore;
+ int i = 0;
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(a += absl::IDivDuration(absl::Microseconds(i),
+ absl::Microseconds(1),
+ &ignore));
+ ++i;
+ }
+}
+BENCHMARK(BM_Duration_IDivDuration_Microseconds);
+
+void BM_Duration_IDivDuration_Milliseconds(benchmark::State& state) {
+ int64_t a = 1;
+ absl::Duration ignore;
+ int i = 0;
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(a += absl::IDivDuration(absl::Milliseconds(i),
+ absl::Milliseconds(1),
+ &ignore));
+ ++i;
+ }
+}
+BENCHMARK(BM_Duration_IDivDuration_Milliseconds);
+
+void BM_Duration_IDivDuration_Seconds(benchmark::State& state) {
+ int64_t a = 1;
+ absl::Duration ignore;
+ int i = 0;
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(
+ a += absl::IDivDuration(absl::Seconds(i), absl::Seconds(1), &ignore));
+ ++i;
+ }
+}
+BENCHMARK(BM_Duration_IDivDuration_Seconds);
+
+void BM_Duration_IDivDuration_Minutes(benchmark::State& state) {
+ int64_t a = 1;
+ absl::Duration ignore;
+ int i = 0;
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(
+ a += absl::IDivDuration(absl::Minutes(i), absl::Minutes(1), &ignore));
+ ++i;
+ }
+}
+BENCHMARK(BM_Duration_IDivDuration_Minutes);
+
+void BM_Duration_IDivDuration_Hours(benchmark::State& state) {
+ int64_t a = 1;
+ absl::Duration ignore;
+ int i = 0;
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(
+ a += absl::IDivDuration(absl::Hours(i), absl::Hours(1), &ignore));
+ ++i;
+ }
+}
+BENCHMARK(BM_Duration_IDivDuration_Hours);
+
+void BM_Duration_ToInt64Nanoseconds(benchmark::State& state) {
+ absl::Duration d = absl::Seconds(100000);
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(absl::ToInt64Nanoseconds(d));
+ }
+}
+BENCHMARK(BM_Duration_ToInt64Nanoseconds);
+
+void BM_Duration_ToInt64Microseconds(benchmark::State& state) {
+ absl::Duration d = absl::Seconds(100000);
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(absl::ToInt64Microseconds(d));
+ }
+}
+BENCHMARK(BM_Duration_ToInt64Microseconds);
+
+void BM_Duration_ToInt64Milliseconds(benchmark::State& state) {
+ absl::Duration d = absl::Seconds(100000);
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(absl::ToInt64Milliseconds(d));
+ }
+}
+BENCHMARK(BM_Duration_ToInt64Milliseconds);
+
+void BM_Duration_ToInt64Seconds(benchmark::State& state) {
+ absl::Duration d = absl::Seconds(100000);
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(absl::ToInt64Seconds(d));
+ }
+}
+BENCHMARK(BM_Duration_ToInt64Seconds);
+
+void BM_Duration_ToInt64Minutes(benchmark::State& state) {
+ absl::Duration d = absl::Seconds(100000);
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(absl::ToInt64Minutes(d));
+ }
+}
+BENCHMARK(BM_Duration_ToInt64Minutes);
+
+void BM_Duration_ToInt64Hours(benchmark::State& state) {
+ absl::Duration d = absl::Seconds(100000);
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(absl::ToInt64Hours(d));
+ }
+}
+BENCHMARK(BM_Duration_ToInt64Hours);
+
+//
+// To/FromTimespec
+//
+
+void BM_Duration_ToTimespec_AbslTime(benchmark::State& state) {
+ absl::Duration d = absl::Seconds(1);
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(absl::ToTimespec(d));
+ }
+}
+BENCHMARK(BM_Duration_ToTimespec_AbslTime);
+
+ABSL_ATTRIBUTE_NOINLINE timespec DoubleToTimespec(double seconds) {
+ timespec ts;
+ ts.tv_sec = seconds;
+ ts.tv_nsec = (seconds - ts.tv_sec) * (1000 * 1000 * 1000);
+ return ts;
+}
+
+void BM_Duration_ToTimespec_Double(benchmark::State& state) {
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(DoubleToTimespec(1.0));
+ }
+}
+BENCHMARK(BM_Duration_ToTimespec_Double);
+
+void BM_Duration_FromTimespec_AbslTime(benchmark::State& state) {
+ timespec ts;
+ ts.tv_sec = 0;
+ ts.tv_nsec = 0;
+ while (state.KeepRunning()) {
+ if (++ts.tv_nsec == 1000 * 1000 * 1000) {
+ ++ts.tv_sec;
+ ts.tv_nsec = 0;
+ }
+ benchmark::DoNotOptimize(absl::DurationFromTimespec(ts));
+ }
+}
+BENCHMARK(BM_Duration_FromTimespec_AbslTime);
+
+ABSL_ATTRIBUTE_NOINLINE double TimespecToDouble(timespec ts) {
+ return ts.tv_sec + (ts.tv_nsec / (1000 * 1000 * 1000));
+}
+
+void BM_Duration_FromTimespec_Double(benchmark::State& state) {
+ timespec ts;
+ ts.tv_sec = 0;
+ ts.tv_nsec = 0;
+ while (state.KeepRunning()) {
+ if (++ts.tv_nsec == 1000 * 1000 * 1000) {
+ ++ts.tv_sec;
+ ts.tv_nsec = 0;
+ }
+ benchmark::DoNotOptimize(TimespecToDouble(ts));
+ }
+}
+BENCHMARK(BM_Duration_FromTimespec_Double);
+
+//
+// String conversions
+//
+
+const char* const kDurations[] = {
+ "0", // 0
+ "123ns", // 1
+ "1h2m3s", // 2
+ "-2h3m4.005006007s", // 3
+ "2562047788015215h30m7.99999999975s", // 4
+};
+const int kNumDurations = sizeof(kDurations) / sizeof(kDurations[0]);
+
+void BM_Duration_FormatDuration(benchmark::State& state) {
+ const std::string s = kDurations[state.range(0)];
+ state.SetLabel(s);
+ absl::Duration d;
+ absl::ParseDuration(kDurations[state.range(0)], &d);
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(absl::FormatDuration(d));
+ }
+}
+BENCHMARK(BM_Duration_FormatDuration)->DenseRange(0, kNumDurations - 1);
+
+void BM_Duration_ParseDuration(benchmark::State& state) {
+ const std::string s = kDurations[state.range(0)];
+ state.SetLabel(s);
+ absl::Duration d;
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(absl::ParseDuration(s, &d));
+ }
+}
+BENCHMARK(BM_Duration_ParseDuration)->DenseRange(0, kNumDurations - 1);
+
+} // namespace
diff --git a/third_party/abseil/src/absl/time/duration_test.cc b/third_party/abseil/src/absl/time/duration_test.cc
new file mode 100644
index 0000000..4d85a2c
--- /dev/null
+++ b/third_party/abseil/src/absl/time/duration_test.cc
@@ -0,0 +1,1808 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#if defined(_MSC_VER)
+#include <winsock2.h> // for timeval
+#endif
+
+#include <chrono> // NOLINT(build/c++11)
+#include <cmath>
+#include <cstdint>
+#include <ctime>
+#include <iomanip>
+#include <limits>
+#include <random>
+#include <string>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/time/time.h"
+
+namespace {
+
+constexpr int64_t kint64max = std::numeric_limits<int64_t>::max();
+constexpr int64_t kint64min = std::numeric_limits<int64_t>::min();
+
+// Approximates the given number of years. This is only used to make some test
+// code more readable.
+absl::Duration ApproxYears(int64_t n) { return absl::Hours(n) * 365 * 24; }
+
+// A gMock matcher to match timespec values. Use this matcher like:
+// timespec ts1, ts2;
+// EXPECT_THAT(ts1, TimespecMatcher(ts2));
+MATCHER_P(TimespecMatcher, ts, "") {
+ if (ts.tv_sec == arg.tv_sec && ts.tv_nsec == arg.tv_nsec)
+ return true;
+ *result_listener << "expected: {" << ts.tv_sec << ", " << ts.tv_nsec << "} ";
+ *result_listener << "actual: {" << arg.tv_sec << ", " << arg.tv_nsec << "}";
+ return false;
+}
+
+// A gMock matcher to match timeval values. Use this matcher like:
+// timeval tv1, tv2;
+// EXPECT_THAT(tv1, TimevalMatcher(tv2));
+MATCHER_P(TimevalMatcher, tv, "") {
+ if (tv.tv_sec == arg.tv_sec && tv.tv_usec == arg.tv_usec)
+ return true;
+ *result_listener << "expected: {" << tv.tv_sec << ", " << tv.tv_usec << "} ";
+ *result_listener << "actual: {" << arg.tv_sec << ", " << arg.tv_usec << "}";
+ return false;
+}
+
+TEST(Duration, ConstExpr) {
+ constexpr absl::Duration d0 = absl::ZeroDuration();
+ static_assert(d0 == absl::ZeroDuration(), "ZeroDuration()");
+ constexpr absl::Duration d1 = absl::Seconds(1);
+ static_assert(d1 == absl::Seconds(1), "Seconds(1)");
+ static_assert(d1 != absl::ZeroDuration(), "Seconds(1)");
+ constexpr absl::Duration d2 = absl::InfiniteDuration();
+ static_assert(d2 == absl::InfiniteDuration(), "InfiniteDuration()");
+ static_assert(d2 != absl::ZeroDuration(), "InfiniteDuration()");
+}
+
+TEST(Duration, ValueSemantics) {
+ // If this compiles, the test passes.
+ constexpr absl::Duration a; // Default construction
+ constexpr absl::Duration b = a; // Copy construction
+ constexpr absl::Duration c(b); // Copy construction (again)
+
+ absl::Duration d;
+ d = c; // Assignment
+}
+
+TEST(Duration, Factories) {
+ constexpr absl::Duration zero = absl::ZeroDuration();
+ constexpr absl::Duration nano = absl::Nanoseconds(1);
+ constexpr absl::Duration micro = absl::Microseconds(1);
+ constexpr absl::Duration milli = absl::Milliseconds(1);
+ constexpr absl::Duration sec = absl::Seconds(1);
+ constexpr absl::Duration min = absl::Minutes(1);
+ constexpr absl::Duration hour = absl::Hours(1);
+
+ EXPECT_EQ(zero, absl::Duration());
+ EXPECT_EQ(zero, absl::Seconds(0));
+ EXPECT_EQ(nano, absl::Nanoseconds(1));
+ EXPECT_EQ(micro, absl::Nanoseconds(1000));
+ EXPECT_EQ(milli, absl::Microseconds(1000));
+ EXPECT_EQ(sec, absl::Milliseconds(1000));
+ EXPECT_EQ(min, absl::Seconds(60));
+ EXPECT_EQ(hour, absl::Minutes(60));
+
+ // Tests factory limits
+ const absl::Duration inf = absl::InfiniteDuration();
+
+ EXPECT_GT(inf, absl::Seconds(kint64max));
+ EXPECT_LT(-inf, absl::Seconds(kint64min));
+ EXPECT_LT(-inf, absl::Seconds(-kint64max));
+
+ EXPECT_EQ(inf, absl::Minutes(kint64max));
+ EXPECT_EQ(-inf, absl::Minutes(kint64min));
+ EXPECT_EQ(-inf, absl::Minutes(-kint64max));
+ EXPECT_GT(inf, absl::Minutes(kint64max / 60));
+ EXPECT_LT(-inf, absl::Minutes(kint64min / 60));
+ EXPECT_LT(-inf, absl::Minutes(-kint64max / 60));
+
+ EXPECT_EQ(inf, absl::Hours(kint64max));
+ EXPECT_EQ(-inf, absl::Hours(kint64min));
+ EXPECT_EQ(-inf, absl::Hours(-kint64max));
+ EXPECT_GT(inf, absl::Hours(kint64max / 3600));
+ EXPECT_LT(-inf, absl::Hours(kint64min / 3600));
+ EXPECT_LT(-inf, absl::Hours(-kint64max / 3600));
+}
+
+TEST(Duration, ToConversion) {
+#define TEST_DURATION_CONVERSION(UNIT) \
+ do { \
+ const absl::Duration d = absl::UNIT(1.5); \
+ constexpr absl::Duration z = absl::ZeroDuration(); \
+ constexpr absl::Duration inf = absl::InfiniteDuration(); \
+ constexpr double dbl_inf = std::numeric_limits<double>::infinity(); \
+ EXPECT_EQ(kint64min, absl::ToInt64##UNIT(-inf)); \
+ EXPECT_EQ(-1, absl::ToInt64##UNIT(-d)); \
+ EXPECT_EQ(0, absl::ToInt64##UNIT(z)); \
+ EXPECT_EQ(1, absl::ToInt64##UNIT(d)); \
+ EXPECT_EQ(kint64max, absl::ToInt64##UNIT(inf)); \
+ EXPECT_EQ(-dbl_inf, absl::ToDouble##UNIT(-inf)); \
+ EXPECT_EQ(-1.5, absl::ToDouble##UNIT(-d)); \
+ EXPECT_EQ(0, absl::ToDouble##UNIT(z)); \
+ EXPECT_EQ(1.5, absl::ToDouble##UNIT(d)); \
+ EXPECT_EQ(dbl_inf, absl::ToDouble##UNIT(inf)); \
+ } while (0)
+
+ TEST_DURATION_CONVERSION(Nanoseconds);
+ TEST_DURATION_CONVERSION(Microseconds);
+ TEST_DURATION_CONVERSION(Milliseconds);
+ TEST_DURATION_CONVERSION(Seconds);
+ TEST_DURATION_CONVERSION(Minutes);
+ TEST_DURATION_CONVERSION(Hours);
+
+#undef TEST_DURATION_CONVERSION
+}
+
+template <int64_t N>
+void TestToConversion() {
+ constexpr absl::Duration nano = absl::Nanoseconds(N);
+ EXPECT_EQ(N, absl::ToInt64Nanoseconds(nano));
+ EXPECT_EQ(0, absl::ToInt64Microseconds(nano));
+ EXPECT_EQ(0, absl::ToInt64Milliseconds(nano));
+ EXPECT_EQ(0, absl::ToInt64Seconds(nano));
+ EXPECT_EQ(0, absl::ToInt64Minutes(nano));
+ EXPECT_EQ(0, absl::ToInt64Hours(nano));
+ const absl::Duration micro = absl::Microseconds(N);
+ EXPECT_EQ(N * 1000, absl::ToInt64Nanoseconds(micro));
+ EXPECT_EQ(N, absl::ToInt64Microseconds(micro));
+ EXPECT_EQ(0, absl::ToInt64Milliseconds(micro));
+ EXPECT_EQ(0, absl::ToInt64Seconds(micro));
+ EXPECT_EQ(0, absl::ToInt64Minutes(micro));
+ EXPECT_EQ(0, absl::ToInt64Hours(micro));
+ const absl::Duration milli = absl::Milliseconds(N);
+ EXPECT_EQ(N * 1000 * 1000, absl::ToInt64Nanoseconds(milli));
+ EXPECT_EQ(N * 1000, absl::ToInt64Microseconds(milli));
+ EXPECT_EQ(N, absl::ToInt64Milliseconds(milli));
+ EXPECT_EQ(0, absl::ToInt64Seconds(milli));
+ EXPECT_EQ(0, absl::ToInt64Minutes(milli));
+ EXPECT_EQ(0, absl::ToInt64Hours(milli));
+ const absl::Duration sec = absl::Seconds(N);
+ EXPECT_EQ(N * 1000 * 1000 * 1000, absl::ToInt64Nanoseconds(sec));
+ EXPECT_EQ(N * 1000 * 1000, absl::ToInt64Microseconds(sec));
+ EXPECT_EQ(N * 1000, absl::ToInt64Milliseconds(sec));
+ EXPECT_EQ(N, absl::ToInt64Seconds(sec));
+ EXPECT_EQ(0, absl::ToInt64Minutes(sec));
+ EXPECT_EQ(0, absl::ToInt64Hours(sec));
+ const absl::Duration min = absl::Minutes(N);
+ EXPECT_EQ(N * 60 * 1000 * 1000 * 1000, absl::ToInt64Nanoseconds(min));
+ EXPECT_EQ(N * 60 * 1000 * 1000, absl::ToInt64Microseconds(min));
+ EXPECT_EQ(N * 60 * 1000, absl::ToInt64Milliseconds(min));
+ EXPECT_EQ(N * 60, absl::ToInt64Seconds(min));
+ EXPECT_EQ(N, absl::ToInt64Minutes(min));
+ EXPECT_EQ(0, absl::ToInt64Hours(min));
+ const absl::Duration hour = absl::Hours(N);
+ EXPECT_EQ(N * 60 * 60 * 1000 * 1000 * 1000, absl::ToInt64Nanoseconds(hour));
+ EXPECT_EQ(N * 60 * 60 * 1000 * 1000, absl::ToInt64Microseconds(hour));
+ EXPECT_EQ(N * 60 * 60 * 1000, absl::ToInt64Milliseconds(hour));
+ EXPECT_EQ(N * 60 * 60, absl::ToInt64Seconds(hour));
+ EXPECT_EQ(N * 60, absl::ToInt64Minutes(hour));
+ EXPECT_EQ(N, absl::ToInt64Hours(hour));
+}
+
+TEST(Duration, ToConversionDeprecated) {
+ TestToConversion<43>();
+ TestToConversion<1>();
+ TestToConversion<0>();
+ TestToConversion<-1>();
+ TestToConversion<-43>();
+}
+
+template <int64_t N>
+void TestFromChronoBasicEquality() {
+ using std::chrono::nanoseconds;
+ using std::chrono::microseconds;
+ using std::chrono::milliseconds;
+ using std::chrono::seconds;
+ using std::chrono::minutes;
+ using std::chrono::hours;
+
+ static_assert(absl::Nanoseconds(N) == absl::FromChrono(nanoseconds(N)), "");
+ static_assert(absl::Microseconds(N) == absl::FromChrono(microseconds(N)), "");
+ static_assert(absl::Milliseconds(N) == absl::FromChrono(milliseconds(N)), "");
+ static_assert(absl::Seconds(N) == absl::FromChrono(seconds(N)), "");
+ static_assert(absl::Minutes(N) == absl::FromChrono(minutes(N)), "");
+ static_assert(absl::Hours(N) == absl::FromChrono(hours(N)), "");
+}
+
+TEST(Duration, FromChrono) {
+ TestFromChronoBasicEquality<-123>();
+ TestFromChronoBasicEquality<-1>();
+ TestFromChronoBasicEquality<0>();
+ TestFromChronoBasicEquality<1>();
+ TestFromChronoBasicEquality<123>();
+
+ // Minutes (might, depending on the platform) saturate at +inf.
+ const auto chrono_minutes_max = std::chrono::minutes::max();
+ const auto minutes_max = absl::FromChrono(chrono_minutes_max);
+ const int64_t minutes_max_count = chrono_minutes_max.count();
+ if (minutes_max_count > kint64max / 60) {
+ EXPECT_EQ(absl::InfiniteDuration(), minutes_max);
+ } else {
+ EXPECT_EQ(absl::Minutes(minutes_max_count), minutes_max);
+ }
+
+ // Minutes (might, depending on the platform) saturate at -inf.
+ const auto chrono_minutes_min = std::chrono::minutes::min();
+ const auto minutes_min = absl::FromChrono(chrono_minutes_min);
+ const int64_t minutes_min_count = chrono_minutes_min.count();
+ if (minutes_min_count < kint64min / 60) {
+ EXPECT_EQ(-absl::InfiniteDuration(), minutes_min);
+ } else {
+ EXPECT_EQ(absl::Minutes(minutes_min_count), minutes_min);
+ }
+
+ // Hours (might, depending on the platform) saturate at +inf.
+ const auto chrono_hours_max = std::chrono::hours::max();
+ const auto hours_max = absl::FromChrono(chrono_hours_max);
+ const int64_t hours_max_count = chrono_hours_max.count();
+ if (hours_max_count > kint64max / 3600) {
+ EXPECT_EQ(absl::InfiniteDuration(), hours_max);
+ } else {
+ EXPECT_EQ(absl::Hours(hours_max_count), hours_max);
+ }
+
+ // Hours (might, depending on the platform) saturate at -inf.
+ const auto chrono_hours_min = std::chrono::hours::min();
+ const auto hours_min = absl::FromChrono(chrono_hours_min);
+ const int64_t hours_min_count = chrono_hours_min.count();
+ if (hours_min_count < kint64min / 3600) {
+ EXPECT_EQ(-absl::InfiniteDuration(), hours_min);
+ } else {
+ EXPECT_EQ(absl::Hours(hours_min_count), hours_min);
+ }
+}
+
+template <int64_t N>
+void TestToChrono() {
+ using std::chrono::nanoseconds;
+ using std::chrono::microseconds;
+ using std::chrono::milliseconds;
+ using std::chrono::seconds;
+ using std::chrono::minutes;
+ using std::chrono::hours;
+
+ EXPECT_EQ(nanoseconds(N), absl::ToChronoNanoseconds(absl::Nanoseconds(N)));
+ EXPECT_EQ(microseconds(N), absl::ToChronoMicroseconds(absl::Microseconds(N)));
+ EXPECT_EQ(milliseconds(N), absl::ToChronoMilliseconds(absl::Milliseconds(N)));
+ EXPECT_EQ(seconds(N), absl::ToChronoSeconds(absl::Seconds(N)));
+
+ constexpr auto absl_minutes = absl::Minutes(N);
+ auto chrono_minutes = minutes(N);
+ if (absl_minutes == -absl::InfiniteDuration()) {
+ chrono_minutes = minutes::min();
+ } else if (absl_minutes == absl::InfiniteDuration()) {
+ chrono_minutes = minutes::max();
+ }
+ EXPECT_EQ(chrono_minutes, absl::ToChronoMinutes(absl_minutes));
+
+ constexpr auto absl_hours = absl::Hours(N);
+ auto chrono_hours = hours(N);
+ if (absl_hours == -absl::InfiniteDuration()) {
+ chrono_hours = hours::min();
+ } else if (absl_hours == absl::InfiniteDuration()) {
+ chrono_hours = hours::max();
+ }
+ EXPECT_EQ(chrono_hours, absl::ToChronoHours(absl_hours));
+}
+
+TEST(Duration, ToChrono) {
+ using std::chrono::nanoseconds;
+ using std::chrono::microseconds;
+ using std::chrono::milliseconds;
+ using std::chrono::seconds;
+ using std::chrono::minutes;
+ using std::chrono::hours;
+
+ TestToChrono<kint64min>();
+ TestToChrono<-1>();
+ TestToChrono<0>();
+ TestToChrono<1>();
+ TestToChrono<kint64max>();
+
+ // Verify truncation toward zero.
+ const auto tick = absl::Nanoseconds(1) / 4;
+ EXPECT_EQ(nanoseconds(0), absl::ToChronoNanoseconds(tick));
+ EXPECT_EQ(nanoseconds(0), absl::ToChronoNanoseconds(-tick));
+ EXPECT_EQ(microseconds(0), absl::ToChronoMicroseconds(tick));
+ EXPECT_EQ(microseconds(0), absl::ToChronoMicroseconds(-tick));
+ EXPECT_EQ(milliseconds(0), absl::ToChronoMilliseconds(tick));
+ EXPECT_EQ(milliseconds(0), absl::ToChronoMilliseconds(-tick));
+ EXPECT_EQ(seconds(0), absl::ToChronoSeconds(tick));
+ EXPECT_EQ(seconds(0), absl::ToChronoSeconds(-tick));
+ EXPECT_EQ(minutes(0), absl::ToChronoMinutes(tick));
+ EXPECT_EQ(minutes(0), absl::ToChronoMinutes(-tick));
+ EXPECT_EQ(hours(0), absl::ToChronoHours(tick));
+ EXPECT_EQ(hours(0), absl::ToChronoHours(-tick));
+
+ // Verifies +/- infinity saturation at max/min.
+ constexpr auto inf = absl::InfiniteDuration();
+ EXPECT_EQ(nanoseconds::min(), absl::ToChronoNanoseconds(-inf));
+ EXPECT_EQ(nanoseconds::max(), absl::ToChronoNanoseconds(inf));
+ EXPECT_EQ(microseconds::min(), absl::ToChronoMicroseconds(-inf));
+ EXPECT_EQ(microseconds::max(), absl::ToChronoMicroseconds(inf));
+ EXPECT_EQ(milliseconds::min(), absl::ToChronoMilliseconds(-inf));
+ EXPECT_EQ(milliseconds::max(), absl::ToChronoMilliseconds(inf));
+ EXPECT_EQ(seconds::min(), absl::ToChronoSeconds(-inf));
+ EXPECT_EQ(seconds::max(), absl::ToChronoSeconds(inf));
+ EXPECT_EQ(minutes::min(), absl::ToChronoMinutes(-inf));
+ EXPECT_EQ(minutes::max(), absl::ToChronoMinutes(inf));
+ EXPECT_EQ(hours::min(), absl::ToChronoHours(-inf));
+ EXPECT_EQ(hours::max(), absl::ToChronoHours(inf));
+}
+
+TEST(Duration, FactoryOverloads) {
+ enum E { kOne = 1 };
+#define TEST_FACTORY_OVERLOADS(NAME) \
+ EXPECT_EQ(1, NAME(kOne) / NAME(kOne)); \
+ EXPECT_EQ(1, NAME(static_cast<int8_t>(1)) / NAME(1)); \
+ EXPECT_EQ(1, NAME(static_cast<int16_t>(1)) / NAME(1)); \
+ EXPECT_EQ(1, NAME(static_cast<int32_t>(1)) / NAME(1)); \
+ EXPECT_EQ(1, NAME(static_cast<int64_t>(1)) / NAME(1)); \
+ EXPECT_EQ(1, NAME(static_cast<uint8_t>(1)) / NAME(1)); \
+ EXPECT_EQ(1, NAME(static_cast<uint16_t>(1)) / NAME(1)); \
+ EXPECT_EQ(1, NAME(static_cast<uint32_t>(1)) / NAME(1)); \
+ EXPECT_EQ(1, NAME(static_cast<uint64_t>(1)) / NAME(1)); \
+ EXPECT_EQ(NAME(1) / 2, NAME(static_cast<float>(0.5))); \
+ EXPECT_EQ(NAME(1) / 2, NAME(static_cast<double>(0.5))); \
+ EXPECT_EQ(1.5, absl::FDivDuration(NAME(static_cast<float>(1.5)), NAME(1))); \
+ EXPECT_EQ(1.5, absl::FDivDuration(NAME(static_cast<double>(1.5)), NAME(1)));
+
+ TEST_FACTORY_OVERLOADS(absl::Nanoseconds);
+ TEST_FACTORY_OVERLOADS(absl::Microseconds);
+ TEST_FACTORY_OVERLOADS(absl::Milliseconds);
+ TEST_FACTORY_OVERLOADS(absl::Seconds);
+ TEST_FACTORY_OVERLOADS(absl::Minutes);
+ TEST_FACTORY_OVERLOADS(absl::Hours);
+
+#undef TEST_FACTORY_OVERLOADS
+
+ EXPECT_EQ(absl::Milliseconds(1500), absl::Seconds(1.5));
+ EXPECT_LT(absl::Nanoseconds(1), absl::Nanoseconds(1.5));
+ EXPECT_GT(absl::Nanoseconds(2), absl::Nanoseconds(1.5));
+
+ const double dbl_inf = std::numeric_limits<double>::infinity();
+ EXPECT_EQ(absl::InfiniteDuration(), absl::Nanoseconds(dbl_inf));
+ EXPECT_EQ(absl::InfiniteDuration(), absl::Microseconds(dbl_inf));
+ EXPECT_EQ(absl::InfiniteDuration(), absl::Milliseconds(dbl_inf));
+ EXPECT_EQ(absl::InfiniteDuration(), absl::Seconds(dbl_inf));
+ EXPECT_EQ(absl::InfiniteDuration(), absl::Minutes(dbl_inf));
+ EXPECT_EQ(absl::InfiniteDuration(), absl::Hours(dbl_inf));
+ EXPECT_EQ(-absl::InfiniteDuration(), absl::Nanoseconds(-dbl_inf));
+ EXPECT_EQ(-absl::InfiniteDuration(), absl::Microseconds(-dbl_inf));
+ EXPECT_EQ(-absl::InfiniteDuration(), absl::Milliseconds(-dbl_inf));
+ EXPECT_EQ(-absl::InfiniteDuration(), absl::Seconds(-dbl_inf));
+ EXPECT_EQ(-absl::InfiniteDuration(), absl::Minutes(-dbl_inf));
+ EXPECT_EQ(-absl::InfiniteDuration(), absl::Hours(-dbl_inf));
+}
+
+TEST(Duration, InfinityExamples) {
+ // These examples are used in the documentation in time.h. They are
+ // written so that they can be copy-n-pasted easily.
+
+ constexpr absl::Duration inf = absl::InfiniteDuration();
+ constexpr absl::Duration d = absl::Seconds(1); // Any finite duration
+
+ EXPECT_TRUE(inf == inf + inf);
+ EXPECT_TRUE(inf == inf + d);
+ EXPECT_TRUE(inf == inf - inf);
+ EXPECT_TRUE(-inf == d - inf);
+
+ EXPECT_TRUE(inf == d * 1e100);
+ EXPECT_TRUE(0 == d / inf); // NOLINT(readability/check)
+
+ // Division by zero returns infinity, or kint64min/MAX where necessary.
+ EXPECT_TRUE(inf == d / 0);
+ EXPECT_TRUE(kint64max == d / absl::ZeroDuration());
+}
+
+TEST(Duration, InfinityComparison) {
+ const absl::Duration inf = absl::InfiniteDuration();
+ const absl::Duration any_dur = absl::Seconds(1);
+
+ // Equality
+ EXPECT_EQ(inf, inf);
+ EXPECT_EQ(-inf, -inf);
+ EXPECT_NE(inf, -inf);
+ EXPECT_NE(any_dur, inf);
+ EXPECT_NE(any_dur, -inf);
+
+ // Relational
+ EXPECT_GT(inf, any_dur);
+ EXPECT_LT(-inf, any_dur);
+ EXPECT_LT(-inf, inf);
+ EXPECT_GT(inf, -inf);
+}
+
+TEST(Duration, InfinityAddition) {
+ const absl::Duration sec_max = absl::Seconds(kint64max);
+ const absl::Duration sec_min = absl::Seconds(kint64min);
+ const absl::Duration any_dur = absl::Seconds(1);
+ const absl::Duration inf = absl::InfiniteDuration();
+
+ // Addition
+ EXPECT_EQ(inf, inf + inf);
+ EXPECT_EQ(inf, inf + -inf);
+ EXPECT_EQ(-inf, -inf + inf);
+ EXPECT_EQ(-inf, -inf + -inf);
+
+ EXPECT_EQ(inf, inf + any_dur);
+ EXPECT_EQ(inf, any_dur + inf);
+ EXPECT_EQ(-inf, -inf + any_dur);
+ EXPECT_EQ(-inf, any_dur + -inf);
+
+ // Interesting case
+ absl::Duration almost_inf = sec_max + absl::Nanoseconds(999999999);
+ EXPECT_GT(inf, almost_inf);
+ almost_inf += -absl::Nanoseconds(999999999);
+ EXPECT_GT(inf, almost_inf);
+
+ // Addition overflow/underflow
+ EXPECT_EQ(inf, sec_max + absl::Seconds(1));
+ EXPECT_EQ(inf, sec_max + sec_max);
+ EXPECT_EQ(-inf, sec_min + -absl::Seconds(1));
+ EXPECT_EQ(-inf, sec_min + -sec_max);
+
+ // For reference: IEEE 754 behavior
+ const double dbl_inf = std::numeric_limits<double>::infinity();
+ EXPECT_TRUE(std::isinf(dbl_inf + dbl_inf));
+ EXPECT_TRUE(std::isnan(dbl_inf + -dbl_inf)); // We return inf
+ EXPECT_TRUE(std::isnan(-dbl_inf + dbl_inf)); // We return inf
+ EXPECT_TRUE(std::isinf(-dbl_inf + -dbl_inf));
+}
+
+TEST(Duration, InfinitySubtraction) {
+ const absl::Duration sec_max = absl::Seconds(kint64max);
+ const absl::Duration sec_min = absl::Seconds(kint64min);
+ const absl::Duration any_dur = absl::Seconds(1);
+ const absl::Duration inf = absl::InfiniteDuration();
+
+ // Subtraction
+ EXPECT_EQ(inf, inf - inf);
+ EXPECT_EQ(inf, inf - -inf);
+ EXPECT_EQ(-inf, -inf - inf);
+ EXPECT_EQ(-inf, -inf - -inf);
+
+ EXPECT_EQ(inf, inf - any_dur);
+ EXPECT_EQ(-inf, any_dur - inf);
+ EXPECT_EQ(-inf, -inf - any_dur);
+ EXPECT_EQ(inf, any_dur - -inf);
+
+ // Subtraction overflow/underflow
+ EXPECT_EQ(inf, sec_max - -absl::Seconds(1));
+ EXPECT_EQ(inf, sec_max - -sec_max);
+ EXPECT_EQ(-inf, sec_min - absl::Seconds(1));
+ EXPECT_EQ(-inf, sec_min - sec_max);
+
+ // Interesting case
+ absl::Duration almost_neg_inf = sec_min;
+ EXPECT_LT(-inf, almost_neg_inf);
+ almost_neg_inf -= -absl::Nanoseconds(1);
+ EXPECT_LT(-inf, almost_neg_inf);
+
+ // For reference: IEEE 754 behavior
+ const double dbl_inf = std::numeric_limits<double>::infinity();
+ EXPECT_TRUE(std::isnan(dbl_inf - dbl_inf)); // We return inf
+ EXPECT_TRUE(std::isinf(dbl_inf - -dbl_inf));
+ EXPECT_TRUE(std::isinf(-dbl_inf - dbl_inf));
+ EXPECT_TRUE(std::isnan(-dbl_inf - -dbl_inf)); // We return inf
+}
+
+TEST(Duration, InfinityMultiplication) {
+ const absl::Duration sec_max = absl::Seconds(kint64max);
+ const absl::Duration sec_min = absl::Seconds(kint64min);
+ const absl::Duration inf = absl::InfiniteDuration();
+
+#define TEST_INF_MUL_WITH_TYPE(T) \
+ EXPECT_EQ(inf, inf * static_cast<T>(2)); \
+ EXPECT_EQ(-inf, inf * static_cast<T>(-2)); \
+ EXPECT_EQ(-inf, -inf * static_cast<T>(2)); \
+ EXPECT_EQ(inf, -inf * static_cast<T>(-2)); \
+ EXPECT_EQ(inf, inf * static_cast<T>(0)); \
+ EXPECT_EQ(-inf, -inf * static_cast<T>(0)); \
+ EXPECT_EQ(inf, sec_max * static_cast<T>(2)); \
+ EXPECT_EQ(inf, sec_min * static_cast<T>(-2)); \
+ EXPECT_EQ(inf, (sec_max / static_cast<T>(2)) * static_cast<T>(3)); \
+ EXPECT_EQ(-inf, sec_max * static_cast<T>(-2)); \
+ EXPECT_EQ(-inf, sec_min * static_cast<T>(2)); \
+ EXPECT_EQ(-inf, (sec_min / static_cast<T>(2)) * static_cast<T>(3));
+
+ TEST_INF_MUL_WITH_TYPE(int64_t); // NOLINT(readability/function)
+ TEST_INF_MUL_WITH_TYPE(double); // NOLINT(readability/function)
+
+#undef TEST_INF_MUL_WITH_TYPE
+
+ const double dbl_inf = std::numeric_limits<double>::infinity();
+ EXPECT_EQ(inf, inf * dbl_inf);
+ EXPECT_EQ(-inf, -inf * dbl_inf);
+ EXPECT_EQ(-inf, inf * -dbl_inf);
+ EXPECT_EQ(inf, -inf * -dbl_inf);
+
+ const absl::Duration any_dur = absl::Seconds(1);
+ EXPECT_EQ(inf, any_dur * dbl_inf);
+ EXPECT_EQ(-inf, -any_dur * dbl_inf);
+ EXPECT_EQ(-inf, any_dur * -dbl_inf);
+ EXPECT_EQ(inf, -any_dur * -dbl_inf);
+
+ // Fixed-point multiplication will produce a finite value, whereas floating
+ // point fuzziness will overflow to inf.
+ EXPECT_NE(absl::InfiniteDuration(), absl::Seconds(1) * kint64max);
+ EXPECT_EQ(inf, absl::Seconds(1) * static_cast<double>(kint64max));
+ EXPECT_NE(-absl::InfiniteDuration(), absl::Seconds(1) * kint64min);
+ EXPECT_EQ(-inf, absl::Seconds(1) * static_cast<double>(kint64min));
+
+ // Note that sec_max * or / by 1.0 overflows to inf due to the 53-bit
+ // limitations of double.
+ EXPECT_NE(inf, sec_max);
+ EXPECT_NE(inf, sec_max / 1);
+ EXPECT_EQ(inf, sec_max / 1.0);
+ EXPECT_NE(inf, sec_max * 1);
+ EXPECT_EQ(inf, sec_max * 1.0);
+}
+
+TEST(Duration, InfinityDivision) {
+ const absl::Duration sec_max = absl::Seconds(kint64max);
+ const absl::Duration sec_min = absl::Seconds(kint64min);
+ const absl::Duration inf = absl::InfiniteDuration();
+
+ // Division of Duration by a double
+#define TEST_INF_DIV_WITH_TYPE(T) \
+ EXPECT_EQ(inf, inf / static_cast<T>(2)); \
+ EXPECT_EQ(-inf, inf / static_cast<T>(-2)); \
+ EXPECT_EQ(-inf, -inf / static_cast<T>(2)); \
+ EXPECT_EQ(inf, -inf / static_cast<T>(-2));
+
+ TEST_INF_DIV_WITH_TYPE(int64_t); // NOLINT(readability/function)
+ TEST_INF_DIV_WITH_TYPE(double); // NOLINT(readability/function)
+
+#undef TEST_INF_DIV_WITH_TYPE
+
+ // Division of Duration by a double overflow/underflow
+ EXPECT_EQ(inf, sec_max / 0.5);
+ EXPECT_EQ(inf, sec_min / -0.5);
+ EXPECT_EQ(inf, ((sec_max / 0.5) + absl::Seconds(1)) / 0.5);
+ EXPECT_EQ(-inf, sec_max / -0.5);
+ EXPECT_EQ(-inf, sec_min / 0.5);
+ EXPECT_EQ(-inf, ((sec_min / 0.5) - absl::Seconds(1)) / 0.5);
+
+ const double dbl_inf = std::numeric_limits<double>::infinity();
+ EXPECT_EQ(inf, inf / dbl_inf);
+ EXPECT_EQ(-inf, inf / -dbl_inf);
+ EXPECT_EQ(-inf, -inf / dbl_inf);
+ EXPECT_EQ(inf, -inf / -dbl_inf);
+
+ const absl::Duration any_dur = absl::Seconds(1);
+ EXPECT_EQ(absl::ZeroDuration(), any_dur / dbl_inf);
+ EXPECT_EQ(absl::ZeroDuration(), any_dur / -dbl_inf);
+ EXPECT_EQ(absl::ZeroDuration(), -any_dur / dbl_inf);
+ EXPECT_EQ(absl::ZeroDuration(), -any_dur / -dbl_inf);
+}
+
+TEST(Duration, InfinityModulus) {
+ const absl::Duration sec_max = absl::Seconds(kint64max);
+ const absl::Duration any_dur = absl::Seconds(1);
+ const absl::Duration inf = absl::InfiniteDuration();
+
+ EXPECT_EQ(inf, inf % inf);
+ EXPECT_EQ(inf, inf % -inf);
+ EXPECT_EQ(-inf, -inf % -inf);
+ EXPECT_EQ(-inf, -inf % inf);
+
+ EXPECT_EQ(any_dur, any_dur % inf);
+ EXPECT_EQ(any_dur, any_dur % -inf);
+ EXPECT_EQ(-any_dur, -any_dur % inf);
+ EXPECT_EQ(-any_dur, -any_dur % -inf);
+
+ EXPECT_EQ(inf, inf % -any_dur);
+ EXPECT_EQ(inf, inf % any_dur);
+ EXPECT_EQ(-inf, -inf % -any_dur);
+ EXPECT_EQ(-inf, -inf % any_dur);
+
+ // Remainder isn't affected by overflow.
+ EXPECT_EQ(absl::ZeroDuration(), sec_max % absl::Seconds(1));
+ EXPECT_EQ(absl::ZeroDuration(), sec_max % absl::Milliseconds(1));
+ EXPECT_EQ(absl::ZeroDuration(), sec_max % absl::Microseconds(1));
+ EXPECT_EQ(absl::ZeroDuration(), sec_max % absl::Nanoseconds(1));
+ EXPECT_EQ(absl::ZeroDuration(), sec_max % absl::Nanoseconds(1) / 4);
+}
+
+TEST(Duration, InfinityIDiv) {
+ const absl::Duration sec_max = absl::Seconds(kint64max);
+ const absl::Duration any_dur = absl::Seconds(1);
+ const absl::Duration inf = absl::InfiniteDuration();
+ const double dbl_inf = std::numeric_limits<double>::infinity();
+
+ // IDivDuration (int64_t return value + a remainer)
+ absl::Duration rem = absl::ZeroDuration();
+ EXPECT_EQ(kint64max, absl::IDivDuration(inf, inf, &rem));
+ EXPECT_EQ(inf, rem);
+
+ rem = absl::ZeroDuration();
+ EXPECT_EQ(kint64max, absl::IDivDuration(-inf, -inf, &rem));
+ EXPECT_EQ(-inf, rem);
+
+ rem = absl::ZeroDuration();
+ EXPECT_EQ(kint64max, absl::IDivDuration(inf, any_dur, &rem));
+ EXPECT_EQ(inf, rem);
+
+ rem = absl::ZeroDuration();
+ EXPECT_EQ(0, absl::IDivDuration(any_dur, inf, &rem));
+ EXPECT_EQ(any_dur, rem);
+
+ rem = absl::ZeroDuration();
+ EXPECT_EQ(kint64max, absl::IDivDuration(-inf, -any_dur, &rem));
+ EXPECT_EQ(-inf, rem);
+
+ rem = absl::ZeroDuration();
+ EXPECT_EQ(0, absl::IDivDuration(-any_dur, -inf, &rem));
+ EXPECT_EQ(-any_dur, rem);
+
+ rem = absl::ZeroDuration();
+ EXPECT_EQ(kint64min, absl::IDivDuration(-inf, inf, &rem));
+ EXPECT_EQ(-inf, rem);
+
+ rem = absl::ZeroDuration();
+ EXPECT_EQ(kint64min, absl::IDivDuration(inf, -inf, &rem));
+ EXPECT_EQ(inf, rem);
+
+ rem = absl::ZeroDuration();
+ EXPECT_EQ(kint64min, absl::IDivDuration(-inf, any_dur, &rem));
+ EXPECT_EQ(-inf, rem);
+
+ rem = absl::ZeroDuration();
+ EXPECT_EQ(0, absl::IDivDuration(-any_dur, inf, &rem));
+ EXPECT_EQ(-any_dur, rem);
+
+ rem = absl::ZeroDuration();
+ EXPECT_EQ(kint64min, absl::IDivDuration(inf, -any_dur, &rem));
+ EXPECT_EQ(inf, rem);
+
+ rem = absl::ZeroDuration();
+ EXPECT_EQ(0, absl::IDivDuration(any_dur, -inf, &rem));
+ EXPECT_EQ(any_dur, rem);
+
+ // IDivDuration overflow/underflow
+ rem = any_dur;
+ EXPECT_EQ(kint64max,
+ absl::IDivDuration(sec_max, absl::Nanoseconds(1) / 4, &rem));
+ EXPECT_EQ(sec_max - absl::Nanoseconds(kint64max) / 4, rem);
+
+ rem = any_dur;
+ EXPECT_EQ(kint64max,
+ absl::IDivDuration(sec_max, absl::Milliseconds(1), &rem));
+ EXPECT_EQ(sec_max - absl::Milliseconds(kint64max), rem);
+
+ rem = any_dur;
+ EXPECT_EQ(kint64max,
+ absl::IDivDuration(-sec_max, -absl::Milliseconds(1), &rem));
+ EXPECT_EQ(-sec_max + absl::Milliseconds(kint64max), rem);
+
+ rem = any_dur;
+ EXPECT_EQ(kint64min,
+ absl::IDivDuration(-sec_max, absl::Milliseconds(1), &rem));
+ EXPECT_EQ(-sec_max - absl::Milliseconds(kint64min), rem);
+
+ rem = any_dur;
+ EXPECT_EQ(kint64min,
+ absl::IDivDuration(sec_max, -absl::Milliseconds(1), &rem));
+ EXPECT_EQ(sec_max + absl::Milliseconds(kint64min), rem);
+
+ //
+ // operator/(Duration, Duration) is a wrapper for IDivDuration().
+ //
+
+ // IEEE 754 says inf / inf should be nan, but int64_t doesn't have
+ // nan so we'll return kint64max/kint64min instead.
+ EXPECT_TRUE(std::isnan(dbl_inf / dbl_inf));
+ EXPECT_EQ(kint64max, inf / inf);
+ EXPECT_EQ(kint64max, -inf / -inf);
+ EXPECT_EQ(kint64min, -inf / inf);
+ EXPECT_EQ(kint64min, inf / -inf);
+
+ EXPECT_TRUE(std::isinf(dbl_inf / 2.0));
+ EXPECT_EQ(kint64max, inf / any_dur);
+ EXPECT_EQ(kint64max, -inf / -any_dur);
+ EXPECT_EQ(kint64min, -inf / any_dur);
+ EXPECT_EQ(kint64min, inf / -any_dur);
+
+ EXPECT_EQ(0.0, 2.0 / dbl_inf);
+ EXPECT_EQ(0, any_dur / inf);
+ EXPECT_EQ(0, any_dur / -inf);
+ EXPECT_EQ(0, -any_dur / inf);
+ EXPECT_EQ(0, -any_dur / -inf);
+ EXPECT_EQ(0, absl::ZeroDuration() / inf);
+
+ // Division of Duration by a Duration overflow/underflow
+ EXPECT_EQ(kint64max, sec_max / absl::Milliseconds(1));
+ EXPECT_EQ(kint64max, -sec_max / -absl::Milliseconds(1));
+ EXPECT_EQ(kint64min, -sec_max / absl::Milliseconds(1));
+ EXPECT_EQ(kint64min, sec_max / -absl::Milliseconds(1));
+}
+
+TEST(Duration, InfinityFDiv) {
+ const absl::Duration any_dur = absl::Seconds(1);
+ const absl::Duration inf = absl::InfiniteDuration();
+ const double dbl_inf = std::numeric_limits<double>::infinity();
+
+ EXPECT_EQ(dbl_inf, absl::FDivDuration(inf, inf));
+ EXPECT_EQ(dbl_inf, absl::FDivDuration(-inf, -inf));
+ EXPECT_EQ(dbl_inf, absl::FDivDuration(inf, any_dur));
+ EXPECT_EQ(0.0, absl::FDivDuration(any_dur, inf));
+ EXPECT_EQ(dbl_inf, absl::FDivDuration(-inf, -any_dur));
+ EXPECT_EQ(0.0, absl::FDivDuration(-any_dur, -inf));
+
+ EXPECT_EQ(-dbl_inf, absl::FDivDuration(-inf, inf));
+ EXPECT_EQ(-dbl_inf, absl::FDivDuration(inf, -inf));
+ EXPECT_EQ(-dbl_inf, absl::FDivDuration(-inf, any_dur));
+ EXPECT_EQ(0.0, absl::FDivDuration(-any_dur, inf));
+ EXPECT_EQ(-dbl_inf, absl::FDivDuration(inf, -any_dur));
+ EXPECT_EQ(0.0, absl::FDivDuration(any_dur, -inf));
+}
+
+TEST(Duration, DivisionByZero) {
+ const absl::Duration zero = absl::ZeroDuration();
+ const absl::Duration inf = absl::InfiniteDuration();
+ const absl::Duration any_dur = absl::Seconds(1);
+ const double dbl_inf = std::numeric_limits<double>::infinity();
+ const double dbl_denorm = std::numeric_limits<double>::denorm_min();
+
+ // Operator/(Duration, double)
+ EXPECT_EQ(inf, zero / 0.0);
+ EXPECT_EQ(-inf, zero / -0.0);
+ EXPECT_EQ(inf, any_dur / 0.0);
+ EXPECT_EQ(-inf, any_dur / -0.0);
+ EXPECT_EQ(-inf, -any_dur / 0.0);
+ EXPECT_EQ(inf, -any_dur / -0.0);
+
+ // Tests dividing by a number very close to, but not quite zero.
+ EXPECT_EQ(zero, zero / dbl_denorm);
+ EXPECT_EQ(zero, zero / -dbl_denorm);
+ EXPECT_EQ(inf, any_dur / dbl_denorm);
+ EXPECT_EQ(-inf, any_dur / -dbl_denorm);
+ EXPECT_EQ(-inf, -any_dur / dbl_denorm);
+ EXPECT_EQ(inf, -any_dur / -dbl_denorm);
+
+ // IDiv
+ absl::Duration rem = zero;
+ EXPECT_EQ(kint64max, absl::IDivDuration(zero, zero, &rem));
+ EXPECT_EQ(inf, rem);
+
+ rem = zero;
+ EXPECT_EQ(kint64max, absl::IDivDuration(any_dur, zero, &rem));
+ EXPECT_EQ(inf, rem);
+
+ rem = zero;
+ EXPECT_EQ(kint64min, absl::IDivDuration(-any_dur, zero, &rem));
+ EXPECT_EQ(-inf, rem);
+
+ // Operator/(Duration, Duration)
+ EXPECT_EQ(kint64max, zero / zero);
+ EXPECT_EQ(kint64max, any_dur / zero);
+ EXPECT_EQ(kint64min, -any_dur / zero);
+
+ // FDiv
+ EXPECT_EQ(dbl_inf, absl::FDivDuration(zero, zero));
+ EXPECT_EQ(dbl_inf, absl::FDivDuration(any_dur, zero));
+ EXPECT_EQ(-dbl_inf, absl::FDivDuration(-any_dur, zero));
+}
+
+TEST(Duration, NaN) {
+ // Note that IEEE 754 does not define the behavior of a nan's sign when it is
+ // copied, so the code below allows for either + or - InfiniteDuration.
+#define TEST_NAN_HANDLING(NAME, NAN) \
+ do { \
+ const auto inf = absl::InfiniteDuration(); \
+ auto x = NAME(NAN); \
+ EXPECT_TRUE(x == inf || x == -inf); \
+ auto y = NAME(42); \
+ y *= NAN; \
+ EXPECT_TRUE(y == inf || y == -inf); \
+ auto z = NAME(42); \
+ z /= NAN; \
+ EXPECT_TRUE(z == inf || z == -inf); \
+ } while (0)
+
+ const double nan = std::numeric_limits<double>::quiet_NaN();
+ TEST_NAN_HANDLING(absl::Nanoseconds, nan);
+ TEST_NAN_HANDLING(absl::Microseconds, nan);
+ TEST_NAN_HANDLING(absl::Milliseconds, nan);
+ TEST_NAN_HANDLING(absl::Seconds, nan);
+ TEST_NAN_HANDLING(absl::Minutes, nan);
+ TEST_NAN_HANDLING(absl::Hours, nan);
+
+ TEST_NAN_HANDLING(absl::Nanoseconds, -nan);
+ TEST_NAN_HANDLING(absl::Microseconds, -nan);
+ TEST_NAN_HANDLING(absl::Milliseconds, -nan);
+ TEST_NAN_HANDLING(absl::Seconds, -nan);
+ TEST_NAN_HANDLING(absl::Minutes, -nan);
+ TEST_NAN_HANDLING(absl::Hours, -nan);
+
+#undef TEST_NAN_HANDLING
+}
+
+TEST(Duration, Range) {
+ const absl::Duration range = ApproxYears(100 * 1e9);
+ const absl::Duration range_future = range;
+ const absl::Duration range_past = -range;
+
+ EXPECT_LT(range_future, absl::InfiniteDuration());
+ EXPECT_GT(range_past, -absl::InfiniteDuration());
+
+ const absl::Duration full_range = range_future - range_past;
+ EXPECT_GT(full_range, absl::ZeroDuration());
+ EXPECT_LT(full_range, absl::InfiniteDuration());
+
+ const absl::Duration neg_full_range = range_past - range_future;
+ EXPECT_LT(neg_full_range, absl::ZeroDuration());
+ EXPECT_GT(neg_full_range, -absl::InfiniteDuration());
+
+ EXPECT_LT(neg_full_range, full_range);
+ EXPECT_EQ(neg_full_range, -full_range);
+}
+
+TEST(Duration, RelationalOperators) {
+#define TEST_REL_OPS(UNIT) \
+ static_assert(UNIT(2) == UNIT(2), ""); \
+ static_assert(UNIT(1) != UNIT(2), ""); \
+ static_assert(UNIT(1) < UNIT(2), ""); \
+ static_assert(UNIT(3) > UNIT(2), ""); \
+ static_assert(UNIT(1) <= UNIT(2), ""); \
+ static_assert(UNIT(2) <= UNIT(2), ""); \
+ static_assert(UNIT(3) >= UNIT(2), ""); \
+ static_assert(UNIT(2) >= UNIT(2), "");
+
+ TEST_REL_OPS(absl::Nanoseconds);
+ TEST_REL_OPS(absl::Microseconds);
+ TEST_REL_OPS(absl::Milliseconds);
+ TEST_REL_OPS(absl::Seconds);
+ TEST_REL_OPS(absl::Minutes);
+ TEST_REL_OPS(absl::Hours);
+
+#undef TEST_REL_OPS
+}
+
+TEST(Duration, Addition) {
+#define TEST_ADD_OPS(UNIT) \
+ do { \
+ EXPECT_EQ(UNIT(2), UNIT(1) + UNIT(1)); \
+ EXPECT_EQ(UNIT(1), UNIT(2) - UNIT(1)); \
+ EXPECT_EQ(UNIT(0), UNIT(2) - UNIT(2)); \
+ EXPECT_EQ(UNIT(-1), UNIT(1) - UNIT(2)); \
+ EXPECT_EQ(UNIT(-2), UNIT(0) - UNIT(2)); \
+ EXPECT_EQ(UNIT(-2), UNIT(1) - UNIT(3)); \
+ absl::Duration a = UNIT(1); \
+ a += UNIT(1); \
+ EXPECT_EQ(UNIT(2), a); \
+ a -= UNIT(1); \
+ EXPECT_EQ(UNIT(1), a); \
+ } while (0)
+
+ TEST_ADD_OPS(absl::Nanoseconds);
+ TEST_ADD_OPS(absl::Microseconds);
+ TEST_ADD_OPS(absl::Milliseconds);
+ TEST_ADD_OPS(absl::Seconds);
+ TEST_ADD_OPS(absl::Minutes);
+ TEST_ADD_OPS(absl::Hours);
+
+#undef TEST_ADD_OPS
+
+ EXPECT_EQ(absl::Seconds(2), absl::Seconds(3) - 2 * absl::Milliseconds(500));
+ EXPECT_EQ(absl::Seconds(2) + absl::Milliseconds(500),
+ absl::Seconds(3) - absl::Milliseconds(500));
+
+ EXPECT_EQ(absl::Seconds(1) + absl::Milliseconds(998),
+ absl::Milliseconds(999) + absl::Milliseconds(999));
+
+ EXPECT_EQ(absl::Milliseconds(-1),
+ absl::Milliseconds(998) - absl::Milliseconds(999));
+
+ // Tests fractions of a nanoseconds. These are implementation details only.
+ EXPECT_GT(absl::Nanoseconds(1), absl::Nanoseconds(1) / 2);
+ EXPECT_EQ(absl::Nanoseconds(1),
+ absl::Nanoseconds(1) / 2 + absl::Nanoseconds(1) / 2);
+ EXPECT_GT(absl::Nanoseconds(1) / 4, absl::Nanoseconds(0));
+ EXPECT_EQ(absl::Nanoseconds(1) / 8, absl::Nanoseconds(0));
+
+ // Tests subtraction that will cause wrap around of the rep_lo_ bits.
+ absl::Duration d_7_5 = absl::Seconds(7) + absl::Milliseconds(500);
+ absl::Duration d_3_7 = absl::Seconds(3) + absl::Milliseconds(700);
+ absl::Duration ans_3_8 = absl::Seconds(3) + absl::Milliseconds(800);
+ EXPECT_EQ(ans_3_8, d_7_5 - d_3_7);
+
+ // Subtracting min_duration
+ absl::Duration min_dur = absl::Seconds(kint64min);
+ EXPECT_EQ(absl::Seconds(0), min_dur - min_dur);
+ EXPECT_EQ(absl::Seconds(kint64max), absl::Seconds(-1) - min_dur);
+}
+
+TEST(Duration, Negation) {
+ // By storing negations of various values in constexpr variables we
+ // verify that the initializers are constant expressions.
+ constexpr absl::Duration negated_zero_duration = -absl::ZeroDuration();
+ EXPECT_EQ(negated_zero_duration, absl::ZeroDuration());
+
+ constexpr absl::Duration negated_infinite_duration =
+ -absl::InfiniteDuration();
+ EXPECT_NE(negated_infinite_duration, absl::InfiniteDuration());
+ EXPECT_EQ(-negated_infinite_duration, absl::InfiniteDuration());
+
+ // The public APIs to check if a duration is infinite depend on using
+ // -InfiniteDuration(), but we're trying to test operator- here, so we
+ // need to use the lower-level internal query IsInfiniteDuration.
+ EXPECT_TRUE(
+ absl::time_internal::IsInfiniteDuration(negated_infinite_duration));
+
+ // The largest Duration is kint64max seconds and kTicksPerSecond - 1 ticks.
+ // Using the absl::time_internal::MakeDuration API is the cleanest way to
+ // construct that Duration.
+ constexpr absl::Duration max_duration = absl::time_internal::MakeDuration(
+ kint64max, absl::time_internal::kTicksPerSecond - 1);
+ constexpr absl::Duration negated_max_duration = -max_duration;
+ // The largest negatable value is one tick above the minimum representable;
+ // it's the negation of max_duration.
+ constexpr absl::Duration nearly_min_duration =
+ absl::time_internal::MakeDuration(kint64min, int64_t{1});
+ constexpr absl::Duration negated_nearly_min_duration = -nearly_min_duration;
+
+ EXPECT_EQ(negated_max_duration, nearly_min_duration);
+ EXPECT_EQ(negated_nearly_min_duration, max_duration);
+ EXPECT_EQ(-(-max_duration), max_duration);
+
+ constexpr absl::Duration min_duration =
+ absl::time_internal::MakeDuration(kint64min);
+ constexpr absl::Duration negated_min_duration = -min_duration;
+ EXPECT_EQ(negated_min_duration, absl::InfiniteDuration());
+}
+
+TEST(Duration, AbsoluteValue) {
+ EXPECT_EQ(absl::ZeroDuration(), AbsDuration(absl::ZeroDuration()));
+ EXPECT_EQ(absl::Seconds(1), AbsDuration(absl::Seconds(1)));
+ EXPECT_EQ(absl::Seconds(1), AbsDuration(absl::Seconds(-1)));
+
+ EXPECT_EQ(absl::InfiniteDuration(), AbsDuration(absl::InfiniteDuration()));
+ EXPECT_EQ(absl::InfiniteDuration(), AbsDuration(-absl::InfiniteDuration()));
+
+ absl::Duration max_dur =
+ absl::Seconds(kint64max) + (absl::Seconds(1) - absl::Nanoseconds(1) / 4);
+ EXPECT_EQ(max_dur, AbsDuration(max_dur));
+
+ absl::Duration min_dur = absl::Seconds(kint64min);
+ EXPECT_EQ(absl::InfiniteDuration(), AbsDuration(min_dur));
+ EXPECT_EQ(max_dur, AbsDuration(min_dur + absl::Nanoseconds(1) / 4));
+}
+
+TEST(Duration, Multiplication) {
+#define TEST_MUL_OPS(UNIT) \
+ do { \
+ EXPECT_EQ(UNIT(5), UNIT(2) * 2.5); \
+ EXPECT_EQ(UNIT(2), UNIT(5) / 2.5); \
+ EXPECT_EQ(UNIT(-5), UNIT(-2) * 2.5); \
+ EXPECT_EQ(UNIT(-5), -UNIT(2) * 2.5); \
+ EXPECT_EQ(UNIT(-5), UNIT(2) * -2.5); \
+ EXPECT_EQ(UNIT(-2), UNIT(-5) / 2.5); \
+ EXPECT_EQ(UNIT(-2), -UNIT(5) / 2.5); \
+ EXPECT_EQ(UNIT(-2), UNIT(5) / -2.5); \
+ EXPECT_EQ(UNIT(2), UNIT(11) % UNIT(3)); \
+ absl::Duration a = UNIT(2); \
+ a *= 2.5; \
+ EXPECT_EQ(UNIT(5), a); \
+ a /= 2.5; \
+ EXPECT_EQ(UNIT(2), a); \
+ a %= UNIT(1); \
+ EXPECT_EQ(UNIT(0), a); \
+ absl::Duration big = UNIT(1000000000); \
+ big *= 3; \
+ big /= 3; \
+ EXPECT_EQ(UNIT(1000000000), big); \
+ EXPECT_EQ(-UNIT(2), -UNIT(2)); \
+ EXPECT_EQ(-UNIT(2), UNIT(2) * -1); \
+ EXPECT_EQ(-UNIT(2), -1 * UNIT(2)); \
+ EXPECT_EQ(-UNIT(-2), UNIT(2)); \
+ EXPECT_EQ(2, UNIT(2) / UNIT(1)); \
+ absl::Duration rem; \
+ EXPECT_EQ(2, absl::IDivDuration(UNIT(2), UNIT(1), &rem)); \
+ EXPECT_EQ(2.0, absl::FDivDuration(UNIT(2), UNIT(1))); \
+ } while (0)
+
+ TEST_MUL_OPS(absl::Nanoseconds);
+ TEST_MUL_OPS(absl::Microseconds);
+ TEST_MUL_OPS(absl::Milliseconds);
+ TEST_MUL_OPS(absl::Seconds);
+ TEST_MUL_OPS(absl::Minutes);
+ TEST_MUL_OPS(absl::Hours);
+
+#undef TEST_MUL_OPS
+
+ // Ensures that multiplication and division by 1 with a maxed-out durations
+ // doesn't lose precision.
+ absl::Duration max_dur =
+ absl::Seconds(kint64max) + (absl::Seconds(1) - absl::Nanoseconds(1) / 4);
+ absl::Duration min_dur = absl::Seconds(kint64min);
+ EXPECT_EQ(max_dur, max_dur * 1);
+ EXPECT_EQ(max_dur, max_dur / 1);
+ EXPECT_EQ(min_dur, min_dur * 1);
+ EXPECT_EQ(min_dur, min_dur / 1);
+
+ // Tests division on a Duration with a large number of significant digits.
+ // Tests when the digits span hi and lo as well as only in hi.
+ absl::Duration sigfigs = absl::Seconds(2000000000) + absl::Nanoseconds(3);
+ EXPECT_EQ(absl::Seconds(666666666) + absl::Nanoseconds(666666667) +
+ absl::Nanoseconds(1) / 2,
+ sigfigs / 3);
+ sigfigs = absl::Seconds(int64_t{7000000000});
+ EXPECT_EQ(absl::Seconds(2333333333) + absl::Nanoseconds(333333333) +
+ absl::Nanoseconds(1) / 4,
+ sigfigs / 3);
+
+ EXPECT_EQ(absl::Seconds(7) + absl::Milliseconds(500), absl::Seconds(3) * 2.5);
+ EXPECT_EQ(absl::Seconds(8) * -1 + absl::Milliseconds(300),
+ (absl::Seconds(2) + absl::Milliseconds(200)) * -3.5);
+ EXPECT_EQ(-absl::Seconds(8) + absl::Milliseconds(300),
+ (absl::Seconds(2) + absl::Milliseconds(200)) * -3.5);
+ EXPECT_EQ(absl::Seconds(1) + absl::Milliseconds(875),
+ (absl::Seconds(7) + absl::Milliseconds(500)) / 4);
+ EXPECT_EQ(absl::Seconds(30),
+ (absl::Seconds(7) + absl::Milliseconds(500)) / 0.25);
+ EXPECT_EQ(absl::Seconds(3),
+ (absl::Seconds(7) + absl::Milliseconds(500)) / 2.5);
+
+ // Tests division remainder.
+ EXPECT_EQ(absl::Nanoseconds(0), absl::Nanoseconds(7) % absl::Nanoseconds(1));
+ EXPECT_EQ(absl::Nanoseconds(0), absl::Nanoseconds(0) % absl::Nanoseconds(10));
+ EXPECT_EQ(absl::Nanoseconds(2), absl::Nanoseconds(7) % absl::Nanoseconds(5));
+ EXPECT_EQ(absl::Nanoseconds(2), absl::Nanoseconds(2) % absl::Nanoseconds(5));
+
+ EXPECT_EQ(absl::Nanoseconds(1), absl::Nanoseconds(10) % absl::Nanoseconds(3));
+ EXPECT_EQ(absl::Nanoseconds(1),
+ absl::Nanoseconds(10) % absl::Nanoseconds(-3));
+ EXPECT_EQ(absl::Nanoseconds(-1),
+ absl::Nanoseconds(-10) % absl::Nanoseconds(3));
+ EXPECT_EQ(absl::Nanoseconds(-1),
+ absl::Nanoseconds(-10) % absl::Nanoseconds(-3));
+
+ EXPECT_EQ(absl::Milliseconds(100),
+ absl::Seconds(1) % absl::Milliseconds(300));
+ EXPECT_EQ(
+ absl::Milliseconds(300),
+ (absl::Seconds(3) + absl::Milliseconds(800)) % absl::Milliseconds(500));
+
+ EXPECT_EQ(absl::Nanoseconds(1), absl::Nanoseconds(1) % absl::Seconds(1));
+ EXPECT_EQ(absl::Nanoseconds(-1), absl::Nanoseconds(-1) % absl::Seconds(1));
+ EXPECT_EQ(0, absl::Nanoseconds(-1) / absl::Seconds(1)); // Actual -1e-9
+
+ // Tests identity a = (a/b)*b + a%b
+#define TEST_MOD_IDENTITY(a, b) \
+ EXPECT_EQ((a), ((a) / (b))*(b) + ((a)%(b)))
+
+ TEST_MOD_IDENTITY(absl::Seconds(0), absl::Seconds(2));
+ TEST_MOD_IDENTITY(absl::Seconds(1), absl::Seconds(1));
+ TEST_MOD_IDENTITY(absl::Seconds(1), absl::Seconds(2));
+ TEST_MOD_IDENTITY(absl::Seconds(2), absl::Seconds(1));
+
+ TEST_MOD_IDENTITY(absl::Seconds(-2), absl::Seconds(1));
+ TEST_MOD_IDENTITY(absl::Seconds(2), absl::Seconds(-1));
+ TEST_MOD_IDENTITY(absl::Seconds(-2), absl::Seconds(-1));
+
+ TEST_MOD_IDENTITY(absl::Nanoseconds(0), absl::Nanoseconds(2));
+ TEST_MOD_IDENTITY(absl::Nanoseconds(1), absl::Nanoseconds(1));
+ TEST_MOD_IDENTITY(absl::Nanoseconds(1), absl::Nanoseconds(2));
+ TEST_MOD_IDENTITY(absl::Nanoseconds(2), absl::Nanoseconds(1));
+
+ TEST_MOD_IDENTITY(absl::Nanoseconds(-2), absl::Nanoseconds(1));
+ TEST_MOD_IDENTITY(absl::Nanoseconds(2), absl::Nanoseconds(-1));
+ TEST_MOD_IDENTITY(absl::Nanoseconds(-2), absl::Nanoseconds(-1));
+
+ // Mixed seconds + subseconds
+ absl::Duration mixed_a = absl::Seconds(1) + absl::Nanoseconds(2);
+ absl::Duration mixed_b = absl::Seconds(1) + absl::Nanoseconds(3);
+
+ TEST_MOD_IDENTITY(absl::Seconds(0), mixed_a);
+ TEST_MOD_IDENTITY(mixed_a, mixed_a);
+ TEST_MOD_IDENTITY(mixed_a, mixed_b);
+ TEST_MOD_IDENTITY(mixed_b, mixed_a);
+
+ TEST_MOD_IDENTITY(-mixed_a, mixed_b);
+ TEST_MOD_IDENTITY(mixed_a, -mixed_b);
+ TEST_MOD_IDENTITY(-mixed_a, -mixed_b);
+
+#undef TEST_MOD_IDENTITY
+}
+
+TEST(Duration, Truncation) {
+ const absl::Duration d = absl::Nanoseconds(1234567890);
+ const absl::Duration inf = absl::InfiniteDuration();
+ for (int unit_sign : {1, -1}) { // sign shouldn't matter
+ EXPECT_EQ(absl::Nanoseconds(1234567890),
+ Trunc(d, unit_sign * absl::Nanoseconds(1)));
+ EXPECT_EQ(absl::Microseconds(1234567),
+ Trunc(d, unit_sign * absl::Microseconds(1)));
+ EXPECT_EQ(absl::Milliseconds(1234),
+ Trunc(d, unit_sign * absl::Milliseconds(1)));
+ EXPECT_EQ(absl::Seconds(1), Trunc(d, unit_sign * absl::Seconds(1)));
+ EXPECT_EQ(inf, Trunc(inf, unit_sign * absl::Seconds(1)));
+
+ EXPECT_EQ(absl::Nanoseconds(-1234567890),
+ Trunc(-d, unit_sign * absl::Nanoseconds(1)));
+ EXPECT_EQ(absl::Microseconds(-1234567),
+ Trunc(-d, unit_sign * absl::Microseconds(1)));
+ EXPECT_EQ(absl::Milliseconds(-1234),
+ Trunc(-d, unit_sign * absl::Milliseconds(1)));
+ EXPECT_EQ(absl::Seconds(-1), Trunc(-d, unit_sign * absl::Seconds(1)));
+ EXPECT_EQ(-inf, Trunc(-inf, unit_sign * absl::Seconds(1)));
+ }
+}
+
+TEST(Duration, Flooring) {
+ const absl::Duration d = absl::Nanoseconds(1234567890);
+ const absl::Duration inf = absl::InfiniteDuration();
+ for (int unit_sign : {1, -1}) { // sign shouldn't matter
+ EXPECT_EQ(absl::Nanoseconds(1234567890),
+ absl::Floor(d, unit_sign * absl::Nanoseconds(1)));
+ EXPECT_EQ(absl::Microseconds(1234567),
+ absl::Floor(d, unit_sign * absl::Microseconds(1)));
+ EXPECT_EQ(absl::Milliseconds(1234),
+ absl::Floor(d, unit_sign * absl::Milliseconds(1)));
+ EXPECT_EQ(absl::Seconds(1), absl::Floor(d, unit_sign * absl::Seconds(1)));
+ EXPECT_EQ(inf, absl::Floor(inf, unit_sign * absl::Seconds(1)));
+
+ EXPECT_EQ(absl::Nanoseconds(-1234567890),
+ absl::Floor(-d, unit_sign * absl::Nanoseconds(1)));
+ EXPECT_EQ(absl::Microseconds(-1234568),
+ absl::Floor(-d, unit_sign * absl::Microseconds(1)));
+ EXPECT_EQ(absl::Milliseconds(-1235),
+ absl::Floor(-d, unit_sign * absl::Milliseconds(1)));
+ EXPECT_EQ(absl::Seconds(-2), absl::Floor(-d, unit_sign * absl::Seconds(1)));
+ EXPECT_EQ(-inf, absl::Floor(-inf, unit_sign * absl::Seconds(1)));
+ }
+}
+
+TEST(Duration, Ceiling) {
+ const absl::Duration d = absl::Nanoseconds(1234567890);
+ const absl::Duration inf = absl::InfiniteDuration();
+ for (int unit_sign : {1, -1}) { // // sign shouldn't matter
+ EXPECT_EQ(absl::Nanoseconds(1234567890),
+ absl::Ceil(d, unit_sign * absl::Nanoseconds(1)));
+ EXPECT_EQ(absl::Microseconds(1234568),
+ absl::Ceil(d, unit_sign * absl::Microseconds(1)));
+ EXPECT_EQ(absl::Milliseconds(1235),
+ absl::Ceil(d, unit_sign * absl::Milliseconds(1)));
+ EXPECT_EQ(absl::Seconds(2), absl::Ceil(d, unit_sign * absl::Seconds(1)));
+ EXPECT_EQ(inf, absl::Ceil(inf, unit_sign * absl::Seconds(1)));
+
+ EXPECT_EQ(absl::Nanoseconds(-1234567890),
+ absl::Ceil(-d, unit_sign * absl::Nanoseconds(1)));
+ EXPECT_EQ(absl::Microseconds(-1234567),
+ absl::Ceil(-d, unit_sign * absl::Microseconds(1)));
+ EXPECT_EQ(absl::Milliseconds(-1234),
+ absl::Ceil(-d, unit_sign * absl::Milliseconds(1)));
+ EXPECT_EQ(absl::Seconds(-1), absl::Ceil(-d, unit_sign * absl::Seconds(1)));
+ EXPECT_EQ(-inf, absl::Ceil(-inf, unit_sign * absl::Seconds(1)));
+ }
+}
+
+TEST(Duration, RoundTripUnits) {
+ const int kRange = 100000;
+
+#define ROUND_TRIP_UNIT(U, LOW, HIGH) \
+ do { \
+ for (int64_t i = LOW; i < HIGH; ++i) { \
+ absl::Duration d = absl::U(i); \
+ if (d == absl::InfiniteDuration()) \
+ EXPECT_EQ(kint64max, d / absl::U(1)); \
+ else if (d == -absl::InfiniteDuration()) \
+ EXPECT_EQ(kint64min, d / absl::U(1)); \
+ else \
+ EXPECT_EQ(i, absl::U(i) / absl::U(1)); \
+ } \
+ } while (0)
+
+ ROUND_TRIP_UNIT(Nanoseconds, kint64min, kint64min + kRange);
+ ROUND_TRIP_UNIT(Nanoseconds, -kRange, kRange);
+ ROUND_TRIP_UNIT(Nanoseconds, kint64max - kRange, kint64max);
+
+ ROUND_TRIP_UNIT(Microseconds, kint64min, kint64min + kRange);
+ ROUND_TRIP_UNIT(Microseconds, -kRange, kRange);
+ ROUND_TRIP_UNIT(Microseconds, kint64max - kRange, kint64max);
+
+ ROUND_TRIP_UNIT(Milliseconds, kint64min, kint64min + kRange);
+ ROUND_TRIP_UNIT(Milliseconds, -kRange, kRange);
+ ROUND_TRIP_UNIT(Milliseconds, kint64max - kRange, kint64max);
+
+ ROUND_TRIP_UNIT(Seconds, kint64min, kint64min + kRange);
+ ROUND_TRIP_UNIT(Seconds, -kRange, kRange);
+ ROUND_TRIP_UNIT(Seconds, kint64max - kRange, kint64max);
+
+ ROUND_TRIP_UNIT(Minutes, kint64min / 60, kint64min / 60 + kRange);
+ ROUND_TRIP_UNIT(Minutes, -kRange, kRange);
+ ROUND_TRIP_UNIT(Minutes, kint64max / 60 - kRange, kint64max / 60);
+
+ ROUND_TRIP_UNIT(Hours, kint64min / 3600, kint64min / 3600 + kRange);
+ ROUND_TRIP_UNIT(Hours, -kRange, kRange);
+ ROUND_TRIP_UNIT(Hours, kint64max / 3600 - kRange, kint64max / 3600);
+
+#undef ROUND_TRIP_UNIT
+}
+
+TEST(Duration, TruncConversions) {
+ // Tests ToTimespec()/DurationFromTimespec()
+ const struct {
+ absl::Duration d;
+ timespec ts;
+ } to_ts[] = {
+ {absl::Seconds(1) + absl::Nanoseconds(1), {1, 1}},
+ {absl::Seconds(1) + absl::Nanoseconds(1) / 2, {1, 0}},
+ {absl::Seconds(1) + absl::Nanoseconds(0), {1, 0}},
+ {absl::Seconds(0) + absl::Nanoseconds(0), {0, 0}},
+ {absl::Seconds(0) - absl::Nanoseconds(1) / 2, {0, 0}},
+ {absl::Seconds(0) - absl::Nanoseconds(1), {-1, 999999999}},
+ {absl::Seconds(-1) + absl::Nanoseconds(1), {-1, 1}},
+ {absl::Seconds(-1) + absl::Nanoseconds(1) / 2, {-1, 1}},
+ {absl::Seconds(-1) + absl::Nanoseconds(0), {-1, 0}},
+ {absl::Seconds(-1) - absl::Nanoseconds(1) / 2, {-1, 0}},
+ };
+ for (const auto& test : to_ts) {
+ EXPECT_THAT(absl::ToTimespec(test.d), TimespecMatcher(test.ts));
+ }
+ const struct {
+ timespec ts;
+ absl::Duration d;
+ } from_ts[] = {
+ {{1, 1}, absl::Seconds(1) + absl::Nanoseconds(1)},
+ {{1, 0}, absl::Seconds(1) + absl::Nanoseconds(0)},
+ {{0, 0}, absl::Seconds(0) + absl::Nanoseconds(0)},
+ {{0, -1}, absl::Seconds(0) - absl::Nanoseconds(1)},
+ {{-1, 999999999}, absl::Seconds(0) - absl::Nanoseconds(1)},
+ {{-1, 1}, absl::Seconds(-1) + absl::Nanoseconds(1)},
+ {{-1, 0}, absl::Seconds(-1) + absl::Nanoseconds(0)},
+ {{-1, -1}, absl::Seconds(-1) - absl::Nanoseconds(1)},
+ {{-2, 999999999}, absl::Seconds(-1) - absl::Nanoseconds(1)},
+ };
+ for (const auto& test : from_ts) {
+ EXPECT_EQ(test.d, absl::DurationFromTimespec(test.ts));
+ }
+
+ // Tests ToTimeval()/DurationFromTimeval() (same as timespec above)
+ const struct {
+ absl::Duration d;
+ timeval tv;
+ } to_tv[] = {
+ {absl::Seconds(1) + absl::Microseconds(1), {1, 1}},
+ {absl::Seconds(1) + absl::Microseconds(1) / 2, {1, 0}},
+ {absl::Seconds(1) + absl::Microseconds(0), {1, 0}},
+ {absl::Seconds(0) + absl::Microseconds(0), {0, 0}},
+ {absl::Seconds(0) - absl::Microseconds(1) / 2, {0, 0}},
+ {absl::Seconds(0) - absl::Microseconds(1), {-1, 999999}},
+ {absl::Seconds(-1) + absl::Microseconds(1), {-1, 1}},
+ {absl::Seconds(-1) + absl::Microseconds(1) / 2, {-1, 1}},
+ {absl::Seconds(-1) + absl::Microseconds(0), {-1, 0}},
+ {absl::Seconds(-1) - absl::Microseconds(1) / 2, {-1, 0}},
+ };
+ for (const auto& test : to_tv) {
+ EXPECT_THAT(absl::ToTimeval(test.d), TimevalMatcher(test.tv));
+ }
+ const struct {
+ timeval tv;
+ absl::Duration d;
+ } from_tv[] = {
+ {{1, 1}, absl::Seconds(1) + absl::Microseconds(1)},
+ {{1, 0}, absl::Seconds(1) + absl::Microseconds(0)},
+ {{0, 0}, absl::Seconds(0) + absl::Microseconds(0)},
+ {{0, -1}, absl::Seconds(0) - absl::Microseconds(1)},
+ {{-1, 999999}, absl::Seconds(0) - absl::Microseconds(1)},
+ {{-1, 1}, absl::Seconds(-1) + absl::Microseconds(1)},
+ {{-1, 0}, absl::Seconds(-1) + absl::Microseconds(0)},
+ {{-1, -1}, absl::Seconds(-1) - absl::Microseconds(1)},
+ {{-2, 999999}, absl::Seconds(-1) - absl::Microseconds(1)},
+ };
+ for (const auto& test : from_tv) {
+ EXPECT_EQ(test.d, absl::DurationFromTimeval(test.tv));
+ }
+}
+
+TEST(Duration, SmallConversions) {
+ // Special tests for conversions of small durations.
+
+ EXPECT_EQ(absl::ZeroDuration(), absl::Seconds(0));
+ // TODO(bww): Is the next one OK?
+ EXPECT_EQ(absl::ZeroDuration(), absl::Seconds(0.124999999e-9));
+ EXPECT_EQ(absl::Nanoseconds(1) / 4, absl::Seconds(0.125e-9));
+ EXPECT_EQ(absl::Nanoseconds(1) / 4, absl::Seconds(0.250e-9));
+ EXPECT_EQ(absl::Nanoseconds(1) / 2, absl::Seconds(0.375e-9));
+ EXPECT_EQ(absl::Nanoseconds(1) / 2, absl::Seconds(0.500e-9));
+ EXPECT_EQ(absl::Nanoseconds(3) / 4, absl::Seconds(0.625e-9));
+ EXPECT_EQ(absl::Nanoseconds(3) / 4, absl::Seconds(0.750e-9));
+ EXPECT_EQ(absl::Nanoseconds(1), absl::Seconds(0.875e-9));
+ EXPECT_EQ(absl::Nanoseconds(1), absl::Seconds(1.000e-9));
+
+ EXPECT_EQ(absl::ZeroDuration(), absl::Seconds(-0.124999999e-9));
+ EXPECT_EQ(-absl::Nanoseconds(1) / 4, absl::Seconds(-0.125e-9));
+ EXPECT_EQ(-absl::Nanoseconds(1) / 4, absl::Seconds(-0.250e-9));
+ EXPECT_EQ(-absl::Nanoseconds(1) / 2, absl::Seconds(-0.375e-9));
+ EXPECT_EQ(-absl::Nanoseconds(1) / 2, absl::Seconds(-0.500e-9));
+ EXPECT_EQ(-absl::Nanoseconds(3) / 4, absl::Seconds(-0.625e-9));
+ EXPECT_EQ(-absl::Nanoseconds(3) / 4, absl::Seconds(-0.750e-9));
+ EXPECT_EQ(-absl::Nanoseconds(1), absl::Seconds(-0.875e-9));
+ EXPECT_EQ(-absl::Nanoseconds(1), absl::Seconds(-1.000e-9));
+
+ timespec ts;
+ ts.tv_sec = 0;
+ ts.tv_nsec = 0;
+ EXPECT_THAT(ToTimespec(absl::Nanoseconds(0)), TimespecMatcher(ts));
+ // TODO(bww): Are the next three OK?
+ EXPECT_THAT(ToTimespec(absl::Nanoseconds(1) / 4), TimespecMatcher(ts));
+ EXPECT_THAT(ToTimespec(absl::Nanoseconds(2) / 4), TimespecMatcher(ts));
+ EXPECT_THAT(ToTimespec(absl::Nanoseconds(3) / 4), TimespecMatcher(ts));
+ ts.tv_nsec = 1;
+ EXPECT_THAT(ToTimespec(absl::Nanoseconds(4) / 4), TimespecMatcher(ts));
+ EXPECT_THAT(ToTimespec(absl::Nanoseconds(5) / 4), TimespecMatcher(ts));
+ EXPECT_THAT(ToTimespec(absl::Nanoseconds(6) / 4), TimespecMatcher(ts));
+ EXPECT_THAT(ToTimespec(absl::Nanoseconds(7) / 4), TimespecMatcher(ts));
+ ts.tv_nsec = 2;
+ EXPECT_THAT(ToTimespec(absl::Nanoseconds(8) / 4), TimespecMatcher(ts));
+
+ timeval tv;
+ tv.tv_sec = 0;
+ tv.tv_usec = 0;
+ EXPECT_THAT(ToTimeval(absl::Nanoseconds(0)), TimevalMatcher(tv));
+ // TODO(bww): Is the next one OK?
+ EXPECT_THAT(ToTimeval(absl::Nanoseconds(999)), TimevalMatcher(tv));
+ tv.tv_usec = 1;
+ EXPECT_THAT(ToTimeval(absl::Nanoseconds(1000)), TimevalMatcher(tv));
+ EXPECT_THAT(ToTimeval(absl::Nanoseconds(1999)), TimevalMatcher(tv));
+ tv.tv_usec = 2;
+ EXPECT_THAT(ToTimeval(absl::Nanoseconds(2000)), TimevalMatcher(tv));
+}
+
+void VerifySameAsMul(double time_as_seconds, int* const misses) {
+ auto direct_seconds = absl::Seconds(time_as_seconds);
+ auto mul_by_one_second = time_as_seconds * absl::Seconds(1);
+ if (direct_seconds != mul_by_one_second) {
+ if (*misses > 10) return;
+ ASSERT_LE(++(*misses), 10) << "Too many errors, not reporting more.";
+ EXPECT_EQ(direct_seconds, mul_by_one_second)
+ << "given double time_as_seconds = " << std::setprecision(17)
+ << time_as_seconds;
+ }
+}
+
+// For a variety of interesting durations, we find the exact point
+// where one double converts to that duration, and the very next double
+// converts to the next duration. For both of those points, verify that
+// Seconds(point) returns the same duration as point * Seconds(1.0)
+TEST(Duration, ToDoubleSecondsCheckEdgeCases) {
+ constexpr uint32_t kTicksPerSecond = absl::time_internal::kTicksPerSecond;
+ constexpr auto duration_tick = absl::time_internal::MakeDuration(0, 1u);
+ int misses = 0;
+ for (int64_t seconds = 0; seconds < 99; ++seconds) {
+ uint32_t tick_vals[] = {0, +999, +999999, +999999999, kTicksPerSecond - 1,
+ 0, 1000, 1000000, 1000000000, kTicksPerSecond,
+ 1, 1001, 1000001, 1000000001, kTicksPerSecond + 1,
+ 2, 1002, 1000002, 1000000002, kTicksPerSecond + 2,
+ 3, 1003, 1000003, 1000000003, kTicksPerSecond + 3,
+ 4, 1004, 1000004, 1000000004, kTicksPerSecond + 4,
+ 5, 6, 7, 8, 9};
+ for (uint32_t ticks : tick_vals) {
+ absl::Duration s_plus_t = absl::Seconds(seconds) + ticks * duration_tick;
+ for (absl::Duration d : {s_plus_t, -s_plus_t}) {
+ absl::Duration after_d = d + duration_tick;
+ EXPECT_NE(d, after_d);
+ EXPECT_EQ(after_d - d, duration_tick);
+
+ double low_edge = ToDoubleSeconds(d);
+ EXPECT_EQ(d, absl::Seconds(low_edge));
+
+ double high_edge = ToDoubleSeconds(after_d);
+ EXPECT_EQ(after_d, absl::Seconds(high_edge));
+
+ for (;;) {
+ double midpoint = low_edge + (high_edge - low_edge) / 2;
+ if (midpoint == low_edge || midpoint == high_edge) break;
+ absl::Duration mid_duration = absl::Seconds(midpoint);
+ if (mid_duration == d) {
+ low_edge = midpoint;
+ } else {
+ EXPECT_EQ(mid_duration, after_d);
+ high_edge = midpoint;
+ }
+ }
+ // Now low_edge is the highest double that converts to Duration d,
+ // and high_edge is the lowest double that converts to Duration after_d.
+ VerifySameAsMul(low_edge, &misses);
+ VerifySameAsMul(high_edge, &misses);
+ }
+ }
+ }
+}
+
+TEST(Duration, ToDoubleSecondsCheckRandom) {
+ std::random_device rd;
+ std::seed_seq seed({rd(), rd(), rd(), rd(), rd(), rd(), rd(), rd()});
+ std::mt19937_64 gen(seed);
+ // We want doubles distributed from 1/8ns up to 2^63, where
+ // as many values are tested from 1ns to 2ns as from 1sec to 2sec,
+ // so even distribute along a log-scale of those values, and
+ // exponentiate before using them. (9.223377e+18 is just slightly
+ // out of bounds for absl::Duration.)
+ std::uniform_real_distribution<double> uniform(std::log(0.125e-9),
+ std::log(9.223377e+18));
+ int misses = 0;
+ for (int i = 0; i < 1000000; ++i) {
+ double d = std::exp(uniform(gen));
+ VerifySameAsMul(d, &misses);
+ VerifySameAsMul(-d, &misses);
+ }
+}
+
+TEST(Duration, ConversionSaturation) {
+ absl::Duration d;
+
+ const auto max_timeval_sec =
+ std::numeric_limits<decltype(timeval::tv_sec)>::max();
+ const auto min_timeval_sec =
+ std::numeric_limits<decltype(timeval::tv_sec)>::min();
+ timeval tv;
+ tv.tv_sec = max_timeval_sec;
+ tv.tv_usec = 999998;
+ d = absl::DurationFromTimeval(tv);
+ tv = ToTimeval(d);
+ EXPECT_EQ(max_timeval_sec, tv.tv_sec);
+ EXPECT_EQ(999998, tv.tv_usec);
+ d += absl::Microseconds(1);
+ tv = ToTimeval(d);
+ EXPECT_EQ(max_timeval_sec, tv.tv_sec);
+ EXPECT_EQ(999999, tv.tv_usec);
+ d += absl::Microseconds(1); // no effect
+ tv = ToTimeval(d);
+ EXPECT_EQ(max_timeval_sec, tv.tv_sec);
+ EXPECT_EQ(999999, tv.tv_usec);
+
+ tv.tv_sec = min_timeval_sec;
+ tv.tv_usec = 1;
+ d = absl::DurationFromTimeval(tv);
+ tv = ToTimeval(d);
+ EXPECT_EQ(min_timeval_sec, tv.tv_sec);
+ EXPECT_EQ(1, tv.tv_usec);
+ d -= absl::Microseconds(1);
+ tv = ToTimeval(d);
+ EXPECT_EQ(min_timeval_sec, tv.tv_sec);
+ EXPECT_EQ(0, tv.tv_usec);
+ d -= absl::Microseconds(1); // no effect
+ tv = ToTimeval(d);
+ EXPECT_EQ(min_timeval_sec, tv.tv_sec);
+ EXPECT_EQ(0, tv.tv_usec);
+
+ const auto max_timespec_sec =
+ std::numeric_limits<decltype(timespec::tv_sec)>::max();
+ const auto min_timespec_sec =
+ std::numeric_limits<decltype(timespec::tv_sec)>::min();
+ timespec ts;
+ ts.tv_sec = max_timespec_sec;
+ ts.tv_nsec = 999999998;
+ d = absl::DurationFromTimespec(ts);
+ ts = absl::ToTimespec(d);
+ EXPECT_EQ(max_timespec_sec, ts.tv_sec);
+ EXPECT_EQ(999999998, ts.tv_nsec);
+ d += absl::Nanoseconds(1);
+ ts = absl::ToTimespec(d);
+ EXPECT_EQ(max_timespec_sec, ts.tv_sec);
+ EXPECT_EQ(999999999, ts.tv_nsec);
+ d += absl::Nanoseconds(1); // no effect
+ ts = absl::ToTimespec(d);
+ EXPECT_EQ(max_timespec_sec, ts.tv_sec);
+ EXPECT_EQ(999999999, ts.tv_nsec);
+
+ ts.tv_sec = min_timespec_sec;
+ ts.tv_nsec = 1;
+ d = absl::DurationFromTimespec(ts);
+ ts = absl::ToTimespec(d);
+ EXPECT_EQ(min_timespec_sec, ts.tv_sec);
+ EXPECT_EQ(1, ts.tv_nsec);
+ d -= absl::Nanoseconds(1);
+ ts = absl::ToTimespec(d);
+ EXPECT_EQ(min_timespec_sec, ts.tv_sec);
+ EXPECT_EQ(0, ts.tv_nsec);
+ d -= absl::Nanoseconds(1); // no effect
+ ts = absl::ToTimespec(d);
+ EXPECT_EQ(min_timespec_sec, ts.tv_sec);
+ EXPECT_EQ(0, ts.tv_nsec);
+}
+
+TEST(Duration, FormatDuration) {
+ // Example from Go's docs.
+ EXPECT_EQ("72h3m0.5s",
+ absl::FormatDuration(absl::Hours(72) + absl::Minutes(3) +
+ absl::Milliseconds(500)));
+ // Go's largest time: 2540400h10m10.000000000s
+ EXPECT_EQ("2540400h10m10s",
+ absl::FormatDuration(absl::Hours(2540400) + absl::Minutes(10) +
+ absl::Seconds(10)));
+
+ EXPECT_EQ("0", absl::FormatDuration(absl::ZeroDuration()));
+ EXPECT_EQ("0", absl::FormatDuration(absl::Seconds(0)));
+ EXPECT_EQ("0", absl::FormatDuration(absl::Nanoseconds(0)));
+
+ EXPECT_EQ("1ns", absl::FormatDuration(absl::Nanoseconds(1)));
+ EXPECT_EQ("1us", absl::FormatDuration(absl::Microseconds(1)));
+ EXPECT_EQ("1ms", absl::FormatDuration(absl::Milliseconds(1)));
+ EXPECT_EQ("1s", absl::FormatDuration(absl::Seconds(1)));
+ EXPECT_EQ("1m", absl::FormatDuration(absl::Minutes(1)));
+ EXPECT_EQ("1h", absl::FormatDuration(absl::Hours(1)));
+
+ EXPECT_EQ("1h1m", absl::FormatDuration(absl::Hours(1) + absl::Minutes(1)));
+ EXPECT_EQ("1h1s", absl::FormatDuration(absl::Hours(1) + absl::Seconds(1)));
+ EXPECT_EQ("1m1s", absl::FormatDuration(absl::Minutes(1) + absl::Seconds(1)));
+
+ EXPECT_EQ("1h0.25s",
+ absl::FormatDuration(absl::Hours(1) + absl::Milliseconds(250)));
+ EXPECT_EQ("1m0.25s",
+ absl::FormatDuration(absl::Minutes(1) + absl::Milliseconds(250)));
+ EXPECT_EQ("1h1m0.25s",
+ absl::FormatDuration(absl::Hours(1) + absl::Minutes(1) +
+ absl::Milliseconds(250)));
+ EXPECT_EQ("1h0.0005s",
+ absl::FormatDuration(absl::Hours(1) + absl::Microseconds(500)));
+ EXPECT_EQ("1h0.0000005s",
+ absl::FormatDuration(absl::Hours(1) + absl::Nanoseconds(500)));
+
+ // Subsecond special case.
+ EXPECT_EQ("1.5ns", absl::FormatDuration(absl::Nanoseconds(1) +
+ absl::Nanoseconds(1) / 2));
+ EXPECT_EQ("1.25ns", absl::FormatDuration(absl::Nanoseconds(1) +
+ absl::Nanoseconds(1) / 4));
+ EXPECT_EQ("1ns", absl::FormatDuration(absl::Nanoseconds(1) +
+ absl::Nanoseconds(1) / 9));
+ EXPECT_EQ("1.2us", absl::FormatDuration(absl::Microseconds(1) +
+ absl::Nanoseconds(200)));
+ EXPECT_EQ("1.2ms", absl::FormatDuration(absl::Milliseconds(1) +
+ absl::Microseconds(200)));
+ EXPECT_EQ("1.0002ms", absl::FormatDuration(absl::Milliseconds(1) +
+ absl::Nanoseconds(200)));
+ EXPECT_EQ("1.00001ms", absl::FormatDuration(absl::Milliseconds(1) +
+ absl::Nanoseconds(10)));
+ EXPECT_EQ("1.000001ms",
+ absl::FormatDuration(absl::Milliseconds(1) + absl::Nanoseconds(1)));
+
+ // Negative durations.
+ EXPECT_EQ("-1ns", absl::FormatDuration(absl::Nanoseconds(-1)));
+ EXPECT_EQ("-1us", absl::FormatDuration(absl::Microseconds(-1)));
+ EXPECT_EQ("-1ms", absl::FormatDuration(absl::Milliseconds(-1)));
+ EXPECT_EQ("-1s", absl::FormatDuration(absl::Seconds(-1)));
+ EXPECT_EQ("-1m", absl::FormatDuration(absl::Minutes(-1)));
+ EXPECT_EQ("-1h", absl::FormatDuration(absl::Hours(-1)));
+
+ EXPECT_EQ("-1h1m",
+ absl::FormatDuration(-(absl::Hours(1) + absl::Minutes(1))));
+ EXPECT_EQ("-1h1s",
+ absl::FormatDuration(-(absl::Hours(1) + absl::Seconds(1))));
+ EXPECT_EQ("-1m1s",
+ absl::FormatDuration(-(absl::Minutes(1) + absl::Seconds(1))));
+
+ EXPECT_EQ("-1ns", absl::FormatDuration(absl::Nanoseconds(-1)));
+ EXPECT_EQ("-1.2us", absl::FormatDuration(
+ -(absl::Microseconds(1) + absl::Nanoseconds(200))));
+ EXPECT_EQ("-1.2ms", absl::FormatDuration(
+ -(absl::Milliseconds(1) + absl::Microseconds(200))));
+ EXPECT_EQ("-1.0002ms", absl::FormatDuration(-(absl::Milliseconds(1) +
+ absl::Nanoseconds(200))));
+ EXPECT_EQ("-1.00001ms", absl::FormatDuration(-(absl::Milliseconds(1) +
+ absl::Nanoseconds(10))));
+ EXPECT_EQ("-1.000001ms", absl::FormatDuration(-(absl::Milliseconds(1) +
+ absl::Nanoseconds(1))));
+
+ //
+ // Interesting corner cases.
+ //
+
+ const absl::Duration qns = absl::Nanoseconds(1) / 4;
+ const absl::Duration max_dur =
+ absl::Seconds(kint64max) + (absl::Seconds(1) - qns);
+ const absl::Duration min_dur = absl::Seconds(kint64min);
+
+ EXPECT_EQ("0.25ns", absl::FormatDuration(qns));
+ EXPECT_EQ("-0.25ns", absl::FormatDuration(-qns));
+ EXPECT_EQ("2562047788015215h30m7.99999999975s",
+ absl::FormatDuration(max_dur));
+ EXPECT_EQ("-2562047788015215h30m8s", absl::FormatDuration(min_dur));
+
+ // Tests printing full precision from units that print using FDivDuration
+ EXPECT_EQ("55.00000000025s", absl::FormatDuration(absl::Seconds(55) + qns));
+ EXPECT_EQ("55.00000025ms",
+ absl::FormatDuration(absl::Milliseconds(55) + qns));
+ EXPECT_EQ("55.00025us", absl::FormatDuration(absl::Microseconds(55) + qns));
+ EXPECT_EQ("55.25ns", absl::FormatDuration(absl::Nanoseconds(55) + qns));
+
+ // Formatting infinity
+ EXPECT_EQ("inf", absl::FormatDuration(absl::InfiniteDuration()));
+ EXPECT_EQ("-inf", absl::FormatDuration(-absl::InfiniteDuration()));
+
+ // Formatting approximately +/- 100 billion years
+ const absl::Duration huge_range = ApproxYears(100000000000);
+ EXPECT_EQ("876000000000000h", absl::FormatDuration(huge_range));
+ EXPECT_EQ("-876000000000000h", absl::FormatDuration(-huge_range));
+
+ EXPECT_EQ("876000000000000h0.999999999s",
+ absl::FormatDuration(huge_range +
+ (absl::Seconds(1) - absl::Nanoseconds(1))));
+ EXPECT_EQ("876000000000000h0.9999999995s",
+ absl::FormatDuration(
+ huge_range + (absl::Seconds(1) - absl::Nanoseconds(1) / 2)));
+ EXPECT_EQ("876000000000000h0.99999999975s",
+ absl::FormatDuration(
+ huge_range + (absl::Seconds(1) - absl::Nanoseconds(1) / 4)));
+
+ EXPECT_EQ("-876000000000000h0.999999999s",
+ absl::FormatDuration(-huge_range -
+ (absl::Seconds(1) - absl::Nanoseconds(1))));
+ EXPECT_EQ("-876000000000000h0.9999999995s",
+ absl::FormatDuration(
+ -huge_range - (absl::Seconds(1) - absl::Nanoseconds(1) / 2)));
+ EXPECT_EQ("-876000000000000h0.99999999975s",
+ absl::FormatDuration(
+ -huge_range - (absl::Seconds(1) - absl::Nanoseconds(1) / 4)));
+}
+
+TEST(Duration, ParseDuration) {
+ absl::Duration d;
+
+ // No specified unit. Should only work for zero and infinity.
+ EXPECT_TRUE(absl::ParseDuration("0", &d));
+ EXPECT_EQ(absl::ZeroDuration(), d);
+ EXPECT_TRUE(absl::ParseDuration("+0", &d));
+ EXPECT_EQ(absl::ZeroDuration(), d);
+ EXPECT_TRUE(absl::ParseDuration("-0", &d));
+ EXPECT_EQ(absl::ZeroDuration(), d);
+
+ EXPECT_TRUE(absl::ParseDuration("inf", &d));
+ EXPECT_EQ(absl::InfiniteDuration(), d);
+ EXPECT_TRUE(absl::ParseDuration("+inf", &d));
+ EXPECT_EQ(absl::InfiniteDuration(), d);
+ EXPECT_TRUE(absl::ParseDuration("-inf", &d));
+ EXPECT_EQ(-absl::InfiniteDuration(), d);
+ EXPECT_FALSE(absl::ParseDuration("infBlah", &d));
+
+ // Illegal input forms.
+ EXPECT_FALSE(absl::ParseDuration("", &d));
+ EXPECT_FALSE(absl::ParseDuration("0.0", &d));
+ EXPECT_FALSE(absl::ParseDuration(".0", &d));
+ EXPECT_FALSE(absl::ParseDuration(".", &d));
+ EXPECT_FALSE(absl::ParseDuration("01", &d));
+ EXPECT_FALSE(absl::ParseDuration("1", &d));
+ EXPECT_FALSE(absl::ParseDuration("-1", &d));
+ EXPECT_FALSE(absl::ParseDuration("2", &d));
+ EXPECT_FALSE(absl::ParseDuration("2 s", &d));
+ EXPECT_FALSE(absl::ParseDuration(".s", &d));
+ EXPECT_FALSE(absl::ParseDuration("-.s", &d));
+ EXPECT_FALSE(absl::ParseDuration("s", &d));
+ EXPECT_FALSE(absl::ParseDuration(" 2s", &d));
+ EXPECT_FALSE(absl::ParseDuration("2s ", &d));
+ EXPECT_FALSE(absl::ParseDuration(" 2s ", &d));
+ EXPECT_FALSE(absl::ParseDuration("2mt", &d));
+ EXPECT_FALSE(absl::ParseDuration("1e3s", &d));
+
+ // One unit type.
+ EXPECT_TRUE(absl::ParseDuration("1ns", &d));
+ EXPECT_EQ(absl::Nanoseconds(1), d);
+ EXPECT_TRUE(absl::ParseDuration("1us", &d));
+ EXPECT_EQ(absl::Microseconds(1), d);
+ EXPECT_TRUE(absl::ParseDuration("1ms", &d));
+ EXPECT_EQ(absl::Milliseconds(1), d);
+ EXPECT_TRUE(absl::ParseDuration("1s", &d));
+ EXPECT_EQ(absl::Seconds(1), d);
+ EXPECT_TRUE(absl::ParseDuration("2m", &d));
+ EXPECT_EQ(absl::Minutes(2), d);
+ EXPECT_TRUE(absl::ParseDuration("2h", &d));
+ EXPECT_EQ(absl::Hours(2), d);
+
+ // Huge counts of a unit.
+ EXPECT_TRUE(absl::ParseDuration("9223372036854775807us", &d));
+ EXPECT_EQ(absl::Microseconds(9223372036854775807), d);
+ EXPECT_TRUE(absl::ParseDuration("-9223372036854775807us", &d));
+ EXPECT_EQ(absl::Microseconds(-9223372036854775807), d);
+
+ // Multiple units.
+ EXPECT_TRUE(absl::ParseDuration("2h3m4s", &d));
+ EXPECT_EQ(absl::Hours(2) + absl::Minutes(3) + absl::Seconds(4), d);
+ EXPECT_TRUE(absl::ParseDuration("3m4s5us", &d));
+ EXPECT_EQ(absl::Minutes(3) + absl::Seconds(4) + absl::Microseconds(5), d);
+ EXPECT_TRUE(absl::ParseDuration("2h3m4s5ms6us7ns", &d));
+ EXPECT_EQ(absl::Hours(2) + absl::Minutes(3) + absl::Seconds(4) +
+ absl::Milliseconds(5) + absl::Microseconds(6) +
+ absl::Nanoseconds(7),
+ d);
+
+ // Multiple units out of order.
+ EXPECT_TRUE(absl::ParseDuration("2us3m4s5h", &d));
+ EXPECT_EQ(absl::Hours(5) + absl::Minutes(3) + absl::Seconds(4) +
+ absl::Microseconds(2),
+ d);
+
+ // Fractional values of units.
+ EXPECT_TRUE(absl::ParseDuration("1.5ns", &d));
+ EXPECT_EQ(1.5 * absl::Nanoseconds(1), d);
+ EXPECT_TRUE(absl::ParseDuration("1.5us", &d));
+ EXPECT_EQ(1.5 * absl::Microseconds(1), d);
+ EXPECT_TRUE(absl::ParseDuration("1.5ms", &d));
+ EXPECT_EQ(1.5 * absl::Milliseconds(1), d);
+ EXPECT_TRUE(absl::ParseDuration("1.5s", &d));
+ EXPECT_EQ(1.5 * absl::Seconds(1), d);
+ EXPECT_TRUE(absl::ParseDuration("1.5m", &d));
+ EXPECT_EQ(1.5 * absl::Minutes(1), d);
+ EXPECT_TRUE(absl::ParseDuration("1.5h", &d));
+ EXPECT_EQ(1.5 * absl::Hours(1), d);
+
+ // Huge fractional counts of a unit.
+ EXPECT_TRUE(absl::ParseDuration("0.4294967295s", &d));
+ EXPECT_EQ(absl::Nanoseconds(429496729) + absl::Nanoseconds(1) / 2, d);
+ EXPECT_TRUE(absl::ParseDuration("0.429496729501234567890123456789s", &d));
+ EXPECT_EQ(absl::Nanoseconds(429496729) + absl::Nanoseconds(1) / 2, d);
+
+ // Negative durations.
+ EXPECT_TRUE(absl::ParseDuration("-1s", &d));
+ EXPECT_EQ(absl::Seconds(-1), d);
+ EXPECT_TRUE(absl::ParseDuration("-1m", &d));
+ EXPECT_EQ(absl::Minutes(-1), d);
+ EXPECT_TRUE(absl::ParseDuration("-1h", &d));
+ EXPECT_EQ(absl::Hours(-1), d);
+
+ EXPECT_TRUE(absl::ParseDuration("-1h2s", &d));
+ EXPECT_EQ(-(absl::Hours(1) + absl::Seconds(2)), d);
+ EXPECT_FALSE(absl::ParseDuration("1h-2s", &d));
+ EXPECT_FALSE(absl::ParseDuration("-1h-2s", &d));
+ EXPECT_FALSE(absl::ParseDuration("-1h -2s", &d));
+}
+
+TEST(Duration, FormatParseRoundTrip) {
+#define TEST_PARSE_ROUNDTRIP(d) \
+ do { \
+ std::string s = absl::FormatDuration(d); \
+ absl::Duration dur; \
+ EXPECT_TRUE(absl::ParseDuration(s, &dur)); \
+ EXPECT_EQ(d, dur); \
+ } while (0)
+
+ TEST_PARSE_ROUNDTRIP(absl::Nanoseconds(1));
+ TEST_PARSE_ROUNDTRIP(absl::Microseconds(1));
+ TEST_PARSE_ROUNDTRIP(absl::Milliseconds(1));
+ TEST_PARSE_ROUNDTRIP(absl::Seconds(1));
+ TEST_PARSE_ROUNDTRIP(absl::Minutes(1));
+ TEST_PARSE_ROUNDTRIP(absl::Hours(1));
+ TEST_PARSE_ROUNDTRIP(absl::Hours(1) + absl::Nanoseconds(2));
+
+ TEST_PARSE_ROUNDTRIP(absl::Nanoseconds(-1));
+ TEST_PARSE_ROUNDTRIP(absl::Microseconds(-1));
+ TEST_PARSE_ROUNDTRIP(absl::Milliseconds(-1));
+ TEST_PARSE_ROUNDTRIP(absl::Seconds(-1));
+ TEST_PARSE_ROUNDTRIP(absl::Minutes(-1));
+ TEST_PARSE_ROUNDTRIP(absl::Hours(-1));
+
+ TEST_PARSE_ROUNDTRIP(absl::Hours(-1) + absl::Nanoseconds(2));
+ TEST_PARSE_ROUNDTRIP(absl::Hours(1) + absl::Nanoseconds(-2));
+ TEST_PARSE_ROUNDTRIP(absl::Hours(-1) + absl::Nanoseconds(-2));
+
+ TEST_PARSE_ROUNDTRIP(absl::Nanoseconds(1) +
+ absl::Nanoseconds(1) / 4); // 1.25ns
+
+ const absl::Duration huge_range = ApproxYears(100000000000);
+ TEST_PARSE_ROUNDTRIP(huge_range);
+ TEST_PARSE_ROUNDTRIP(huge_range + (absl::Seconds(1) - absl::Nanoseconds(1)));
+
+#undef TEST_PARSE_ROUNDTRIP
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/time/format.cc b/third_party/abseil/src/absl/time/format.cc
new file mode 100644
index 0000000..4005fb7
--- /dev/null
+++ b/third_party/abseil/src/absl/time/format.cc
@@ -0,0 +1,160 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <string.h>
+
+#include <cctype>
+#include <cstdint>
+
+#include "absl/strings/match.h"
+#include "absl/strings/string_view.h"
+#include "absl/time/internal/cctz/include/cctz/time_zone.h"
+#include "absl/time/time.h"
+
+namespace cctz = absl::time_internal::cctz;
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+ABSL_DLL extern const char RFC3339_full[] = "%Y-%m-%d%ET%H:%M:%E*S%Ez";
+ABSL_DLL extern const char RFC3339_sec[] = "%Y-%m-%d%ET%H:%M:%S%Ez";
+
+ABSL_DLL extern const char RFC1123_full[] = "%a, %d %b %E4Y %H:%M:%S %z";
+ABSL_DLL extern const char RFC1123_no_wday[] = "%d %b %E4Y %H:%M:%S %z";
+
+namespace {
+
+const char kInfiniteFutureStr[] = "infinite-future";
+const char kInfinitePastStr[] = "infinite-past";
+
+struct cctz_parts {
+ cctz::time_point<cctz::seconds> sec;
+ cctz::detail::femtoseconds fem;
+};
+
+inline cctz::time_point<cctz::seconds> unix_epoch() {
+ return std::chrono::time_point_cast<cctz::seconds>(
+ std::chrono::system_clock::from_time_t(0));
+}
+
+// Splits a Time into seconds and femtoseconds, which can be used with CCTZ.
+// Requires that 't' is finite. See duration.cc for details about rep_hi and
+// rep_lo.
+cctz_parts Split(absl::Time t) {
+ const auto d = time_internal::ToUnixDuration(t);
+ const int64_t rep_hi = time_internal::GetRepHi(d);
+ const int64_t rep_lo = time_internal::GetRepLo(d);
+ const auto sec = unix_epoch() + cctz::seconds(rep_hi);
+ const auto fem = cctz::detail::femtoseconds(rep_lo * (1000 * 1000 / 4));
+ return {sec, fem};
+}
+
+// Joins the given seconds and femtoseconds into a Time. See duration.cc for
+// details about rep_hi and rep_lo.
+absl::Time Join(const cctz_parts& parts) {
+ const int64_t rep_hi = (parts.sec - unix_epoch()).count();
+ const uint32_t rep_lo = parts.fem.count() / (1000 * 1000 / 4);
+ const auto d = time_internal::MakeDuration(rep_hi, rep_lo);
+ return time_internal::FromUnixDuration(d);
+}
+
+} // namespace
+
+std::string FormatTime(absl::string_view format, absl::Time t,
+ absl::TimeZone tz) {
+ if (t == absl::InfiniteFuture()) return std::string(kInfiniteFutureStr);
+ if (t == absl::InfinitePast()) return std::string(kInfinitePastStr);
+ const auto parts = Split(t);
+ return cctz::detail::format(std::string(format), parts.sec, parts.fem,
+ cctz::time_zone(tz));
+}
+
+std::string FormatTime(absl::Time t, absl::TimeZone tz) {
+ return FormatTime(RFC3339_full, t, tz);
+}
+
+std::string FormatTime(absl::Time t) {
+ return absl::FormatTime(RFC3339_full, t, absl::LocalTimeZone());
+}
+
+bool ParseTime(absl::string_view format, absl::string_view input,
+ absl::Time* time, std::string* err) {
+ return absl::ParseTime(format, input, absl::UTCTimeZone(), time, err);
+}
+
+// If the input string does not contain an explicit UTC offset, interpret
+// the fields with respect to the given TimeZone.
+bool ParseTime(absl::string_view format, absl::string_view input,
+ absl::TimeZone tz, absl::Time* time, std::string* err) {
+ auto strip_leading_space = [](absl::string_view* sv) {
+ while (!sv->empty()) {
+ if (!std::isspace(sv->front())) return;
+ sv->remove_prefix(1);
+ }
+ };
+
+ // Portable toolchains means we don't get nice constexpr here.
+ struct Literal {
+ const char* name;
+ size_t size;
+ absl::Time value;
+ };
+ static Literal literals[] = {
+ {kInfiniteFutureStr, strlen(kInfiniteFutureStr), InfiniteFuture()},
+ {kInfinitePastStr, strlen(kInfinitePastStr), InfinitePast()},
+ };
+ strip_leading_space(&input);
+ for (const auto& lit : literals) {
+ if (absl::StartsWith(input, absl::string_view(lit.name, lit.size))) {
+ absl::string_view tail = input;
+ tail.remove_prefix(lit.size);
+ strip_leading_space(&tail);
+ if (tail.empty()) {
+ *time = lit.value;
+ return true;
+ }
+ }
+ }
+
+ std::string error;
+ cctz_parts parts;
+ const bool b =
+ cctz::detail::parse(std::string(format), std::string(input),
+ cctz::time_zone(tz), &parts.sec, &parts.fem, &error);
+ if (b) {
+ *time = Join(parts);
+ } else if (err != nullptr) {
+ *err = error;
+ }
+ return b;
+}
+
+// Functions required to support absl::Time flags.
+bool AbslParseFlag(absl::string_view text, absl::Time* t, std::string* error) {
+ return absl::ParseTime(RFC3339_full, text, absl::UTCTimeZone(), t, error);
+}
+
+std::string AbslUnparseFlag(absl::Time t) {
+ return absl::FormatTime(RFC3339_full, t, absl::UTCTimeZone());
+}
+bool ParseFlag(const std::string& text, absl::Time* t, std::string* error) {
+ return absl::ParseTime(RFC3339_full, text, absl::UTCTimeZone(), t, error);
+}
+
+std::string UnparseFlag(absl::Time t) {
+ return absl::FormatTime(RFC3339_full, t, absl::UTCTimeZone());
+}
+
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/time/format_benchmark.cc b/third_party/abseil/src/absl/time/format_benchmark.cc
new file mode 100644
index 0000000..19e481d
--- /dev/null
+++ b/third_party/abseil/src/absl/time/format_benchmark.cc
@@ -0,0 +1,64 @@
+// Copyright 2018 The Abseil Authors.
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <cstddef>
+#include <string>
+
+#include "absl/time/internal/test_util.h"
+#include "absl/time/time.h"
+#include "benchmark/benchmark.h"
+
+namespace {
+
+namespace {
+const char* const kFormats[] = {
+ absl::RFC1123_full, // 0
+ absl::RFC1123_no_wday, // 1
+ absl::RFC3339_full, // 2
+ absl::RFC3339_sec, // 3
+ "%Y-%m-%d%ET%H:%M:%S", // 4
+ "%Y-%m-%d", // 5
+};
+const int kNumFormats = sizeof(kFormats) / sizeof(kFormats[0]);
+} // namespace
+
+void BM_Format_FormatTime(benchmark::State& state) {
+ const std::string fmt = kFormats[state.range(0)];
+ state.SetLabel(fmt);
+ const absl::TimeZone lax =
+ absl::time_internal::LoadTimeZone("America/Los_Angeles");
+ const absl::Time t =
+ absl::FromCivil(absl::CivilSecond(1977, 6, 28, 9, 8, 7), lax) +
+ absl::Nanoseconds(1);
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(absl::FormatTime(fmt, t, lax).length());
+ }
+}
+BENCHMARK(BM_Format_FormatTime)->DenseRange(0, kNumFormats - 1);
+
+void BM_Format_ParseTime(benchmark::State& state) {
+ const std::string fmt = kFormats[state.range(0)];
+ state.SetLabel(fmt);
+ const absl::TimeZone lax =
+ absl::time_internal::LoadTimeZone("America/Los_Angeles");
+ absl::Time t = absl::FromCivil(absl::CivilSecond(1977, 6, 28, 9, 8, 7), lax) +
+ absl::Nanoseconds(1);
+ const std::string when = absl::FormatTime(fmt, t, lax);
+ std::string err;
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(absl::ParseTime(fmt, when, lax, &t, &err));
+ }
+}
+BENCHMARK(BM_Format_ParseTime)->DenseRange(0, kNumFormats - 1);
+
+} // namespace
diff --git a/third_party/abseil/src/absl/time/format_test.cc b/third_party/abseil/src/absl/time/format_test.cc
new file mode 100644
index 0000000..a9a1eb8
--- /dev/null
+++ b/third_party/abseil/src/absl/time/format_test.cc
@@ -0,0 +1,441 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <cstdint>
+#include <limits>
+#include <string>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/time/internal/test_util.h"
+#include "absl/time/time.h"
+
+using testing::HasSubstr;
+
+namespace {
+
+// A helper that tests the given format specifier by itself, and with leading
+// and trailing characters. For example: TestFormatSpecifier(t, "%a", "Thu").
+void TestFormatSpecifier(absl::Time t, absl::TimeZone tz,
+ const std::string& fmt, const std::string& ans) {
+ EXPECT_EQ(ans, absl::FormatTime(fmt, t, tz));
+ EXPECT_EQ("xxx " + ans, absl::FormatTime("xxx " + fmt, t, tz));
+ EXPECT_EQ(ans + " yyy", absl::FormatTime(fmt + " yyy", t, tz));
+ EXPECT_EQ("xxx " + ans + " yyy",
+ absl::FormatTime("xxx " + fmt + " yyy", t, tz));
+}
+
+//
+// Testing FormatTime()
+//
+
+TEST(FormatTime, Basics) {
+ absl::TimeZone tz = absl::UTCTimeZone();
+ absl::Time t = absl::FromTimeT(0);
+
+ // Starts with a couple basic edge cases.
+ EXPECT_EQ("", absl::FormatTime("", t, tz));
+ EXPECT_EQ(" ", absl::FormatTime(" ", t, tz));
+ EXPECT_EQ(" ", absl::FormatTime(" ", t, tz));
+ EXPECT_EQ("xxx", absl::FormatTime("xxx", t, tz));
+ std::string big(128, 'x');
+ EXPECT_EQ(big, absl::FormatTime(big, t, tz));
+ // Cause the 1024-byte buffer to grow.
+ std::string bigger(100000, 'x');
+ EXPECT_EQ(bigger, absl::FormatTime(bigger, t, tz));
+
+ t += absl::Hours(13) + absl::Minutes(4) + absl::Seconds(5);
+ t += absl::Milliseconds(6) + absl::Microseconds(7) + absl::Nanoseconds(8);
+ EXPECT_EQ("1970-01-01", absl::FormatTime("%Y-%m-%d", t, tz));
+ EXPECT_EQ("13:04:05", absl::FormatTime("%H:%M:%S", t, tz));
+ EXPECT_EQ("13:04:05.006", absl::FormatTime("%H:%M:%E3S", t, tz));
+ EXPECT_EQ("13:04:05.006007", absl::FormatTime("%H:%M:%E6S", t, tz));
+ EXPECT_EQ("13:04:05.006007008", absl::FormatTime("%H:%M:%E9S", t, tz));
+}
+
+TEST(FormatTime, LocaleSpecific) {
+ const absl::TimeZone tz = absl::UTCTimeZone();
+ absl::Time t = absl::FromTimeT(0);
+
+ TestFormatSpecifier(t, tz, "%a", "Thu");
+ TestFormatSpecifier(t, tz, "%A", "Thursday");
+ TestFormatSpecifier(t, tz, "%b", "Jan");
+ TestFormatSpecifier(t, tz, "%B", "January");
+
+ // %c should at least produce the numeric year and time-of-day.
+ const std::string s =
+ absl::FormatTime("%c", absl::FromTimeT(0), absl::UTCTimeZone());
+ EXPECT_THAT(s, HasSubstr("1970"));
+ EXPECT_THAT(s, HasSubstr("00:00:00"));
+
+ TestFormatSpecifier(t, tz, "%p", "AM");
+ TestFormatSpecifier(t, tz, "%x", "01/01/70");
+ TestFormatSpecifier(t, tz, "%X", "00:00:00");
+}
+
+TEST(FormatTime, ExtendedSeconds) {
+ const absl::TimeZone tz = absl::UTCTimeZone();
+
+ // No subseconds.
+ absl::Time t = absl::FromTimeT(0) + absl::Seconds(5);
+ EXPECT_EQ("05", absl::FormatTime("%E*S", t, tz));
+ EXPECT_EQ("05.000000000000000", absl::FormatTime("%E15S", t, tz));
+
+ // With subseconds.
+ t += absl::Milliseconds(6) + absl::Microseconds(7) + absl::Nanoseconds(8);
+ EXPECT_EQ("05.006007008", absl::FormatTime("%E*S", t, tz));
+ EXPECT_EQ("05", absl::FormatTime("%E0S", t, tz));
+ EXPECT_EQ("05.006007008000000", absl::FormatTime("%E15S", t, tz));
+
+ // Times before the Unix epoch.
+ t = absl::FromUnixMicros(-1);
+ EXPECT_EQ("1969-12-31 23:59:59.999999",
+ absl::FormatTime("%Y-%m-%d %H:%M:%E*S", t, tz));
+
+ // Here is a "%E*S" case we got wrong for a while. While the first
+ // instant below is correctly rendered as "...:07.333304", the second
+ // one used to appear as "...:07.33330499999999999".
+ t = absl::FromUnixMicros(1395024427333304);
+ EXPECT_EQ("2014-03-17 02:47:07.333304",
+ absl::FormatTime("%Y-%m-%d %H:%M:%E*S", t, tz));
+ t += absl::Microseconds(1);
+ EXPECT_EQ("2014-03-17 02:47:07.333305",
+ absl::FormatTime("%Y-%m-%d %H:%M:%E*S", t, tz));
+}
+
+TEST(FormatTime, RFC1123FormatPadsYear) { // locale specific
+ absl::TimeZone tz = absl::UTCTimeZone();
+
+ // A year of 77 should be padded to 0077.
+ absl::Time t = absl::FromCivil(absl::CivilSecond(77, 6, 28, 9, 8, 7), tz);
+ EXPECT_EQ("Mon, 28 Jun 0077 09:08:07 +0000",
+ absl::FormatTime(absl::RFC1123_full, t, tz));
+ EXPECT_EQ("28 Jun 0077 09:08:07 +0000",
+ absl::FormatTime(absl::RFC1123_no_wday, t, tz));
+}
+
+TEST(FormatTime, InfiniteTime) {
+ absl::TimeZone tz = absl::time_internal::LoadTimeZone("America/Los_Angeles");
+
+ // The format and timezone are ignored.
+ EXPECT_EQ("infinite-future",
+ absl::FormatTime("%H:%M blah", absl::InfiniteFuture(), tz));
+ EXPECT_EQ("infinite-past",
+ absl::FormatTime("%H:%M blah", absl::InfinitePast(), tz));
+}
+
+//
+// Testing ParseTime()
+//
+
+TEST(ParseTime, Basics) {
+ absl::Time t = absl::FromTimeT(1234567890);
+ std::string err;
+
+ // Simple edge cases.
+ EXPECT_TRUE(absl::ParseTime("", "", &t, &err)) << err;
+ EXPECT_EQ(absl::UnixEpoch(), t); // everything defaulted
+ EXPECT_TRUE(absl::ParseTime(" ", " ", &t, &err)) << err;
+ EXPECT_TRUE(absl::ParseTime(" ", " ", &t, &err)) << err;
+ EXPECT_TRUE(absl::ParseTime("x", "x", &t, &err)) << err;
+ EXPECT_TRUE(absl::ParseTime("xxx", "xxx", &t, &err)) << err;
+
+ EXPECT_TRUE(absl::ParseTime("%Y-%m-%d %H:%M:%S %z",
+ "2013-06-28 19:08:09 -0800", &t, &err))
+ << err;
+ const auto ci = absl::FixedTimeZone(-8 * 60 * 60).At(t);
+ EXPECT_EQ(absl::CivilSecond(2013, 6, 28, 19, 8, 9), ci.cs);
+ EXPECT_EQ(absl::ZeroDuration(), ci.subsecond);
+}
+
+TEST(ParseTime, NullErrorString) {
+ absl::Time t;
+ EXPECT_FALSE(absl::ParseTime("%Q", "invalid format", &t, nullptr));
+ EXPECT_FALSE(absl::ParseTime("%H", "12 trailing data", &t, nullptr));
+ EXPECT_FALSE(
+ absl::ParseTime("%H out of range", "42 out of range", &t, nullptr));
+}
+
+TEST(ParseTime, WithTimeZone) {
+ const absl::TimeZone tz =
+ absl::time_internal::LoadTimeZone("America/Los_Angeles");
+ absl::Time t;
+ std::string e;
+
+ // We can parse a string without a UTC offset if we supply a timezone.
+ EXPECT_TRUE(
+ absl::ParseTime("%Y-%m-%d %H:%M:%S", "2013-06-28 19:08:09", tz, &t, &e))
+ << e;
+ auto ci = tz.At(t);
+ EXPECT_EQ(absl::CivilSecond(2013, 6, 28, 19, 8, 9), ci.cs);
+ EXPECT_EQ(absl::ZeroDuration(), ci.subsecond);
+
+ // But the timezone is ignored when a UTC offset is present.
+ EXPECT_TRUE(absl::ParseTime("%Y-%m-%d %H:%M:%S %z",
+ "2013-06-28 19:08:09 +0800", tz, &t, &e))
+ << e;
+ ci = absl::FixedTimeZone(8 * 60 * 60).At(t);
+ EXPECT_EQ(absl::CivilSecond(2013, 6, 28, 19, 8, 9), ci.cs);
+ EXPECT_EQ(absl::ZeroDuration(), ci.subsecond);
+}
+
+TEST(ParseTime, ErrorCases) {
+ absl::Time t = absl::FromTimeT(0);
+ std::string err;
+
+ EXPECT_FALSE(absl::ParseTime("%S", "123", &t, &err)) << err;
+ EXPECT_THAT(err, HasSubstr("Illegal trailing data"));
+
+ // Can't parse an illegal format specifier.
+ err.clear();
+ EXPECT_FALSE(absl::ParseTime("%Q", "x", &t, &err)) << err;
+ // Exact contents of "err" are platform-dependent because of
+ // differences in the strptime implementation between macOS and Linux.
+ EXPECT_FALSE(err.empty());
+
+ // Fails because of trailing, unparsed data "blah".
+ EXPECT_FALSE(absl::ParseTime("%m-%d", "2-3 blah", &t, &err)) << err;
+ EXPECT_THAT(err, HasSubstr("Illegal trailing data"));
+
+ // Feb 31 requires normalization.
+ EXPECT_FALSE(absl::ParseTime("%m-%d", "2-31", &t, &err)) << err;
+ EXPECT_THAT(err, HasSubstr("Out-of-range"));
+
+ // Check that we cannot have spaces in UTC offsets.
+ EXPECT_TRUE(absl::ParseTime("%z", "-0203", &t, &err)) << err;
+ EXPECT_FALSE(absl::ParseTime("%z", "- 2 3", &t, &err)) << err;
+ EXPECT_THAT(err, HasSubstr("Failed to parse"));
+ EXPECT_TRUE(absl::ParseTime("%Ez", "-02:03", &t, &err)) << err;
+ EXPECT_FALSE(absl::ParseTime("%Ez", "- 2: 3", &t, &err)) << err;
+ EXPECT_THAT(err, HasSubstr("Failed to parse"));
+
+ // Check that we reject other malformed UTC offsets.
+ EXPECT_FALSE(absl::ParseTime("%Ez", "+-08:00", &t, &err)) << err;
+ EXPECT_THAT(err, HasSubstr("Failed to parse"));
+ EXPECT_FALSE(absl::ParseTime("%Ez", "-+08:00", &t, &err)) << err;
+ EXPECT_THAT(err, HasSubstr("Failed to parse"));
+
+ // Check that we do not accept "-0" in fields that allow zero.
+ EXPECT_FALSE(absl::ParseTime("%Y", "-0", &t, &err)) << err;
+ EXPECT_THAT(err, HasSubstr("Failed to parse"));
+ EXPECT_FALSE(absl::ParseTime("%E4Y", "-0", &t, &err)) << err;
+ EXPECT_THAT(err, HasSubstr("Failed to parse"));
+ EXPECT_FALSE(absl::ParseTime("%H", "-0", &t, &err)) << err;
+ EXPECT_THAT(err, HasSubstr("Failed to parse"));
+ EXPECT_FALSE(absl::ParseTime("%M", "-0", &t, &err)) << err;
+ EXPECT_THAT(err, HasSubstr("Failed to parse"));
+ EXPECT_FALSE(absl::ParseTime("%S", "-0", &t, &err)) << err;
+ EXPECT_THAT(err, HasSubstr("Failed to parse"));
+ EXPECT_FALSE(absl::ParseTime("%z", "+-000", &t, &err)) << err;
+ EXPECT_THAT(err, HasSubstr("Failed to parse"));
+ EXPECT_FALSE(absl::ParseTime("%Ez", "+-0:00", &t, &err)) << err;
+ EXPECT_THAT(err, HasSubstr("Failed to parse"));
+ EXPECT_FALSE(absl::ParseTime("%z", "-00-0", &t, &err)) << err;
+ EXPECT_THAT(err, HasSubstr("Illegal trailing data"));
+ EXPECT_FALSE(absl::ParseTime("%Ez", "-00:-0", &t, &err)) << err;
+ EXPECT_THAT(err, HasSubstr("Illegal trailing data"));
+}
+
+TEST(ParseTime, ExtendedSeconds) {
+ std::string err;
+ absl::Time t;
+
+ // Here is a "%E*S" case we got wrong for a while. The fractional
+ // part of the first instant is less than 2^31 and was correctly
+ // parsed, while the second (and any subsecond field >=2^31) failed.
+ t = absl::UnixEpoch();
+ EXPECT_TRUE(absl::ParseTime("%E*S", "0.2147483647", &t, &err)) << err;
+ EXPECT_EQ(absl::UnixEpoch() + absl::Nanoseconds(214748364) +
+ absl::Nanoseconds(1) / 2,
+ t);
+ t = absl::UnixEpoch();
+ EXPECT_TRUE(absl::ParseTime("%E*S", "0.2147483648", &t, &err)) << err;
+ EXPECT_EQ(absl::UnixEpoch() + absl::Nanoseconds(214748364) +
+ absl::Nanoseconds(3) / 4,
+ t);
+
+ // We should also be able to specify long strings of digits far
+ // beyond the current resolution and have them convert the same way.
+ t = absl::UnixEpoch();
+ EXPECT_TRUE(absl::ParseTime(
+ "%E*S", "0.214748364801234567890123456789012345678901234567890123456789",
+ &t, &err))
+ << err;
+ EXPECT_EQ(absl::UnixEpoch() + absl::Nanoseconds(214748364) +
+ absl::Nanoseconds(3) / 4,
+ t);
+}
+
+TEST(ParseTime, ExtendedOffsetErrors) {
+ std::string err;
+ absl::Time t;
+
+ // %z against +-HHMM.
+ EXPECT_FALSE(absl::ParseTime("%z", "-123", &t, &err)) << err;
+ EXPECT_THAT(err, HasSubstr("Illegal trailing data"));
+
+ // %z against +-HH.
+ EXPECT_FALSE(absl::ParseTime("%z", "-1", &t, &err)) << err;
+ EXPECT_THAT(err, HasSubstr("Failed to parse"));
+
+ // %Ez against +-HH:MM.
+ EXPECT_FALSE(absl::ParseTime("%Ez", "-12:3", &t, &err)) << err;
+ EXPECT_THAT(err, HasSubstr("Illegal trailing data"));
+
+ // %Ez against +-HHMM.
+ EXPECT_FALSE(absl::ParseTime("%Ez", "-123", &t, &err)) << err;
+ EXPECT_THAT(err, HasSubstr("Illegal trailing data"));
+
+ // %Ez against +-HH.
+ EXPECT_FALSE(absl::ParseTime("%Ez", "-1", &t, &err)) << err;
+ EXPECT_THAT(err, HasSubstr("Failed to parse"));
+}
+
+TEST(ParseTime, InfiniteTime) {
+ absl::Time t;
+ std::string err;
+ EXPECT_TRUE(absl::ParseTime("%H:%M blah", "infinite-future", &t, &err));
+ EXPECT_EQ(absl::InfiniteFuture(), t);
+
+ // Surrounding whitespace.
+ EXPECT_TRUE(absl::ParseTime("%H:%M blah", " infinite-future", &t, &err));
+ EXPECT_EQ(absl::InfiniteFuture(), t);
+ EXPECT_TRUE(absl::ParseTime("%H:%M blah", "infinite-future ", &t, &err));
+ EXPECT_EQ(absl::InfiniteFuture(), t);
+ EXPECT_TRUE(absl::ParseTime("%H:%M blah", " infinite-future ", &t, &err));
+ EXPECT_EQ(absl::InfiniteFuture(), t);
+
+ EXPECT_TRUE(absl::ParseTime("%H:%M blah", "infinite-past", &t, &err));
+ EXPECT_EQ(absl::InfinitePast(), t);
+
+ // Surrounding whitespace.
+ EXPECT_TRUE(absl::ParseTime("%H:%M blah", " infinite-past", &t, &err));
+ EXPECT_EQ(absl::InfinitePast(), t);
+ EXPECT_TRUE(absl::ParseTime("%H:%M blah", "infinite-past ", &t, &err));
+ EXPECT_EQ(absl::InfinitePast(), t);
+ EXPECT_TRUE(absl::ParseTime("%H:%M blah", " infinite-past ", &t, &err));
+ EXPECT_EQ(absl::InfinitePast(), t);
+
+ // "infinite-future" as literal string
+ absl::TimeZone tz = absl::UTCTimeZone();
+ EXPECT_TRUE(absl::ParseTime("infinite-future %H:%M", "infinite-future 03:04",
+ &t, &err));
+ EXPECT_NE(absl::InfiniteFuture(), t);
+ EXPECT_EQ(3, tz.At(t).cs.hour());
+ EXPECT_EQ(4, tz.At(t).cs.minute());
+
+ // "infinite-past" as literal string
+ EXPECT_TRUE(
+ absl::ParseTime("infinite-past %H:%M", "infinite-past 03:04", &t, &err));
+ EXPECT_NE(absl::InfinitePast(), t);
+ EXPECT_EQ(3, tz.At(t).cs.hour());
+ EXPECT_EQ(4, tz.At(t).cs.minute());
+
+ // The input doesn't match the format.
+ EXPECT_FALSE(absl::ParseTime("infinite-future %H:%M", "03:04", &t, &err));
+ EXPECT_FALSE(absl::ParseTime("infinite-past %H:%M", "03:04", &t, &err));
+}
+
+TEST(ParseTime, FailsOnUnrepresentableTime) {
+ const absl::TimeZone utc = absl::UTCTimeZone();
+ absl::Time t;
+ EXPECT_FALSE(
+ absl::ParseTime("%Y-%m-%d", "-292277022657-01-27", utc, &t, nullptr));
+ EXPECT_TRUE(
+ absl::ParseTime("%Y-%m-%d", "-292277022657-01-28", utc, &t, nullptr));
+ EXPECT_TRUE(
+ absl::ParseTime("%Y-%m-%d", "292277026596-12-04", utc, &t, nullptr));
+ EXPECT_FALSE(
+ absl::ParseTime("%Y-%m-%d", "292277026596-12-05", utc, &t, nullptr));
+}
+
+//
+// Roundtrip test for FormatTime()/ParseTime().
+//
+
+TEST(FormatParse, RoundTrip) {
+ const absl::TimeZone lax =
+ absl::time_internal::LoadTimeZone("America/Los_Angeles");
+ const absl::Time in =
+ absl::FromCivil(absl::CivilSecond(1977, 6, 28, 9, 8, 7), lax);
+ const absl::Duration subseconds = absl::Nanoseconds(654321);
+ std::string err;
+
+ // RFC3339, which renders subseconds.
+ {
+ absl::Time out;
+ const std::string s =
+ absl::FormatTime(absl::RFC3339_full, in + subseconds, lax);
+ EXPECT_TRUE(absl::ParseTime(absl::RFC3339_full, s, &out, &err))
+ << s << ": " << err;
+ EXPECT_EQ(in + subseconds, out); // RFC3339_full includes %Ez
+ }
+
+ // RFC1123, which only does whole seconds.
+ {
+ absl::Time out;
+ const std::string s = absl::FormatTime(absl::RFC1123_full, in, lax);
+ EXPECT_TRUE(absl::ParseTime(absl::RFC1123_full, s, &out, &err))
+ << s << ": " << err;
+ EXPECT_EQ(in, out); // RFC1123_full includes %z
+ }
+
+ // `absl::FormatTime()` falls back to strftime() for "%c", which appears to
+ // work. On Windows, `absl::ParseTime()` falls back to std::get_time() which
+ // appears to fail on "%c" (or at least on the "%c" text produced by
+ // `strftime()`). This makes it fail the round-trip test.
+ //
+ // Under the emscripten compiler `absl::ParseTime() falls back to
+ // `strptime()`, but that ends up using a different definition for "%c"
+ // compared to `strftime()`, also causing the round-trip test to fail
+ // (see https://github.com/kripken/emscripten/pull/7491).
+#if !defined(_MSC_VER) && !defined(__EMSCRIPTEN__)
+ // Even though we don't know what %c will produce, it should roundtrip,
+ // but only in the 0-offset timezone.
+ {
+ absl::Time out;
+ const std::string s = absl::FormatTime("%c", in, absl::UTCTimeZone());
+ EXPECT_TRUE(absl::ParseTime("%c", s, &out, &err)) << s << ": " << err;
+ EXPECT_EQ(in, out);
+ }
+#endif // !_MSC_VER && !__EMSCRIPTEN__
+}
+
+TEST(FormatParse, RoundTripDistantFuture) {
+ const absl::TimeZone tz = absl::UTCTimeZone();
+ const absl::Time in =
+ absl::FromUnixSeconds(std::numeric_limits<int64_t>::max());
+ std::string err;
+
+ absl::Time out;
+ const std::string s = absl::FormatTime(absl::RFC3339_full, in, tz);
+ EXPECT_TRUE(absl::ParseTime(absl::RFC3339_full, s, &out, &err))
+ << s << ": " << err;
+ EXPECT_EQ(in, out);
+}
+
+TEST(FormatParse, RoundTripDistantPast) {
+ const absl::TimeZone tz = absl::UTCTimeZone();
+ const absl::Time in =
+ absl::FromUnixSeconds(std::numeric_limits<int64_t>::min());
+ std::string err;
+
+ absl::Time out;
+ const std::string s = absl::FormatTime(absl::RFC3339_full, in, tz);
+ EXPECT_TRUE(absl::ParseTime(absl::RFC3339_full, s, &out, &err))
+ << s << ": " << err;
+ EXPECT_EQ(in, out);
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/time/internal/cctz/BUILD.bazel b/third_party/abseil/src/absl/time/internal/cctz/BUILD.bazel
new file mode 100644
index 0000000..45a9529
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/BUILD.bazel
@@ -0,0 +1,171 @@
+# Copyright 2016 Google Inc. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+load("@rules_cc//cc:defs.bzl", "cc_library", "cc_test")
+
+package(features = ["-parse_headers"])
+
+licenses(["notice"])
+
+filegroup(
+ name = "zoneinfo",
+ srcs = glob(["testdata/zoneinfo/**"]),
+)
+
+config_setting(
+ name = "osx",
+ constraint_values = [
+ "@bazel_tools//platforms:osx",
+ ],
+)
+
+config_setting(
+ name = "ios",
+ constraint_values = [
+ "@bazel_tools//platforms:ios",
+ ],
+)
+
+### libraries
+
+cc_library(
+ name = "civil_time",
+ srcs = ["src/civil_time_detail.cc"],
+ hdrs = [
+ "include/cctz/civil_time.h",
+ ],
+ textual_hdrs = ["include/cctz/civil_time_detail.h"],
+ visibility = ["//visibility:public"],
+ deps = ["//absl/base:config"],
+)
+
+cc_library(
+ name = "time_zone",
+ srcs = [
+ "src/time_zone_fixed.cc",
+ "src/time_zone_fixed.h",
+ "src/time_zone_format.cc",
+ "src/time_zone_if.cc",
+ "src/time_zone_if.h",
+ "src/time_zone_impl.cc",
+ "src/time_zone_impl.h",
+ "src/time_zone_info.cc",
+ "src/time_zone_info.h",
+ "src/time_zone_libc.cc",
+ "src/time_zone_libc.h",
+ "src/time_zone_lookup.cc",
+ "src/time_zone_posix.cc",
+ "src/time_zone_posix.h",
+ "src/tzfile.h",
+ "src/zone_info_source.cc",
+ ],
+ hdrs = [
+ "include/cctz/time_zone.h",
+ "include/cctz/zone_info_source.h",
+ ],
+ linkopts = select({
+ ":osx": [
+ "-framework Foundation",
+ ],
+ ":ios": [
+ "-framework Foundation",
+ ],
+ "//conditions:default": [],
+ }),
+ visibility = ["//visibility:public"],
+ deps = [
+ ":civil_time",
+ "//absl/base:config",
+ ],
+)
+
+### tests
+
+test_suite(
+ name = "all_tests",
+ visibility = ["//visibility:public"],
+)
+
+cc_test(
+ name = "civil_time_test",
+ size = "small",
+ srcs = ["src/civil_time_test.cc"],
+ deps = [
+ ":civil_time",
+ "//absl/base:config",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "time_zone_format_test",
+ size = "small",
+ srcs = ["src/time_zone_format_test.cc"],
+ data = [":zoneinfo"],
+ tags = [
+ "no_test_android_arm",
+ "no_test_android_arm64",
+ "no_test_android_x86",
+ ],
+ deps = [
+ ":civil_time",
+ ":time_zone",
+ "//absl/base:config",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "time_zone_lookup_test",
+ size = "small",
+ timeout = "moderate",
+ srcs = ["src/time_zone_lookup_test.cc"],
+ data = [":zoneinfo"],
+ tags = [
+ "no_test_android_arm",
+ "no_test_android_arm64",
+ "no_test_android_x86",
+ ],
+ deps = [
+ ":civil_time",
+ ":time_zone",
+ "//absl/base:config",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+### benchmarks
+
+cc_test(
+ name = "cctz_benchmark",
+ srcs = [
+ "src/cctz_benchmark.cc",
+ "src/time_zone_if.h",
+ "src/time_zone_impl.h",
+ "src/time_zone_info.h",
+ "src/tzfile.h",
+ ],
+ linkstatic = 1,
+ tags = ["benchmark"],
+ deps = [
+ ":civil_time",
+ ":time_zone",
+ "//absl/base:config",
+ "@com_github_google_benchmark//:benchmark_main",
+ ],
+)
+
+### examples
+
+### binaries
diff --git a/third_party/abseil/src/absl/time/internal/cctz/include/cctz/civil_time.h b/third_party/abseil/src/absl/time/internal/cctz/include/cctz/civil_time.h
new file mode 100644
index 0000000..d47ff86
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/include/cctz/civil_time.h
@@ -0,0 +1,332 @@
+// Copyright 2016 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_TIME_INTERNAL_CCTZ_CIVIL_TIME_H_
+#define ABSL_TIME_INTERNAL_CCTZ_CIVIL_TIME_H_
+
+#include "absl/base/config.h"
+#include "absl/time/internal/cctz/include/cctz/civil_time_detail.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace time_internal {
+namespace cctz {
+
+// The term "civil time" refers to the legally recognized human-scale time
+// that is represented by the six fields YYYY-MM-DD hh:mm:ss. Modern-day civil
+// time follows the Gregorian Calendar and is a time-zone-independent concept.
+// A "date" is perhaps the most common example of a civil time (represented in
+// this library as cctz::civil_day). This library provides six classes and a
+// handful of functions that help with rounding, iterating, and arithmetic on
+// civil times while avoiding complications like daylight-saving time (DST).
+//
+// The following six classes form the core of this civil-time library:
+//
+// * civil_second
+// * civil_minute
+// * civil_hour
+// * civil_day
+// * civil_month
+// * civil_year
+//
+// Each class is a simple value type with the same interface for construction
+// and the same six accessors for each of the civil fields (year, month, day,
+// hour, minute, and second, aka YMDHMS). These classes differ only in their
+// alignment, which is indicated by the type name and specifies the field on
+// which arithmetic operates.
+//
+// Each class can be constructed by passing up to six optional integer
+// arguments representing the YMDHMS fields (in that order) to the
+// constructor. Omitted fields are assigned their minimum valid value. Hours,
+// minutes, and seconds will be set to 0, month and day will be set to 1, and
+// since there is no minimum valid year, it will be set to 1970. So, a
+// default-constructed civil-time object will have YMDHMS fields representing
+// "1970-01-01 00:00:00". Fields that are out-of-range are normalized (e.g.,
+// October 32 -> November 1) so that all civil-time objects represent valid
+// values.
+//
+// Each civil-time class is aligned to the civil-time field indicated in the
+// class's name after normalization. Alignment is performed by setting all the
+// inferior fields to their minimum valid value (as described above). The
+// following are examples of how each of the six types would align the fields
+// representing November 22, 2015 at 12:34:56 in the afternoon. (Note: the
+// string format used here is not important; it's just a shorthand way of
+// showing the six YMDHMS fields.)
+//
+// civil_second 2015-11-22 12:34:56
+// civil_minute 2015-11-22 12:34:00
+// civil_hour 2015-11-22 12:00:00
+// civil_day 2015-11-22 00:00:00
+// civil_month 2015-11-01 00:00:00
+// civil_year 2015-01-01 00:00:00
+//
+// Each civil-time type performs arithmetic on the field to which it is
+// aligned. This means that adding 1 to a civil_day increments the day field
+// (normalizing as necessary), and subtracting 7 from a civil_month operates
+// on the month field (normalizing as necessary). All arithmetic produces a
+// valid civil time. Difference requires two similarly aligned civil-time
+// objects and returns the scalar answer in units of the objects' alignment.
+// For example, the difference between two civil_hour objects will give an
+// answer in units of civil hours.
+//
+// In addition to the six civil-time types just described, there are
+// a handful of helper functions and algorithms for performing common
+// calculations. These are described below.
+//
+// Note: In C++14 and later, this library is usable in a constexpr context.
+//
+// CONSTRUCTION:
+//
+// Each of the civil-time types can be constructed in two ways: by directly
+// passing to the constructor up to six (optional) integers representing the
+// YMDHMS fields, or by copying the YMDHMS fields from a differently aligned
+// civil-time type.
+//
+// civil_day default_value; // 1970-01-01 00:00:00
+//
+// civil_day a(2015, 2, 3); // 2015-02-03 00:00:00
+// civil_day b(2015, 2, 3, 4, 5, 6); // 2015-02-03 00:00:00
+// civil_day c(2015); // 2015-01-01 00:00:00
+//
+// civil_second ss(2015, 2, 3, 4, 5, 6); // 2015-02-03 04:05:06
+// civil_minute mm(ss); // 2015-02-03 04:05:00
+// civil_hour hh(mm); // 2015-02-03 04:00:00
+// civil_day d(hh); // 2015-02-03 00:00:00
+// civil_month m(d); // 2015-02-01 00:00:00
+// civil_year y(m); // 2015-01-01 00:00:00
+//
+// m = civil_month(y); // 2015-01-01 00:00:00
+// d = civil_day(m); // 2015-01-01 00:00:00
+// hh = civil_hour(d); // 2015-01-01 00:00:00
+// mm = civil_minute(hh); // 2015-01-01 00:00:00
+// ss = civil_second(mm); // 2015-01-01 00:00:00
+//
+// ALIGNMENT CONVERSION:
+//
+// The alignment of a civil-time object cannot change, but the object may be
+// used to construct a new object with a different alignment. This is referred
+// to as "realigning". When realigning to a type with the same or more
+// precision (e.g., civil_day -> civil_second), the conversion may be
+// performed implicitly since no information is lost. However, if information
+// could be discarded (e.g., civil_second -> civil_day), the conversion must
+// be explicit at the call site.
+//
+// void fun(const civil_day& day);
+//
+// civil_second cs;
+// fun(cs); // Won't compile because data may be discarded
+// fun(civil_day(cs)); // OK: explicit conversion
+//
+// civil_day cd;
+// fun(cd); // OK: no conversion needed
+//
+// civil_month cm;
+// fun(cm); // OK: implicit conversion to civil_day
+//
+// NORMALIZATION:
+//
+// Integer arguments passed to the constructor may be out-of-range, in which
+// case they are normalized to produce a valid civil-time object. This enables
+// natural arithmetic on constructor arguments without worrying about the
+// field's range. Normalization guarantees that there are no invalid
+// civil-time objects.
+//
+// civil_day d(2016, 10, 32); // Out-of-range day; normalized to 2016-11-01
+//
+// Note: If normalization is undesired, you can signal an error by comparing
+// the constructor arguments to the normalized values returned by the YMDHMS
+// properties.
+//
+// PROPERTIES:
+//
+// All civil-time types have accessors for all six of the civil-time fields:
+// year, month, day, hour, minute, and second. Recall that fields inferior to
+// the type's alignment will be set to their minimum valid value.
+//
+// civil_day d(2015, 6, 28);
+// // d.year() == 2015
+// // d.month() == 6
+// // d.day() == 28
+// // d.hour() == 0
+// // d.minute() == 0
+// // d.second() == 0
+//
+// COMPARISON:
+//
+// Comparison always considers all six YMDHMS fields, regardless of the type's
+// alignment. Comparison between differently aligned civil-time types is
+// allowed.
+//
+// civil_day feb_3(2015, 2, 3); // 2015-02-03 00:00:00
+// civil_day mar_4(2015, 3, 4); // 2015-03-04 00:00:00
+// // feb_3 < mar_4
+// // civil_year(feb_3) == civil_year(mar_4)
+//
+// civil_second feb_3_noon(2015, 2, 3, 12, 0, 0); // 2015-02-03 12:00:00
+// // feb_3 < feb_3_noon
+// // feb_3 == civil_day(feb_3_noon)
+//
+// // Iterates all the days of February 2015.
+// for (civil_day d(2015, 2, 1); d < civil_month(2015, 3); ++d) {
+// // ...
+// }
+//
+// STREAMING:
+//
+// Each civil-time type may be sent to an output stream using operator<<().
+// The output format follows the pattern "YYYY-MM-DDThh:mm:ss" where fields
+// inferior to the type's alignment are omitted.
+//
+// civil_second cs(2015, 2, 3, 4, 5, 6);
+// std::cout << cs << "\n"; // Outputs: 2015-02-03T04:05:06
+//
+// civil_day cd(cs);
+// std::cout << cd << "\n"; // Outputs: 2015-02-03
+//
+// civil_year cy(cs);
+// std::cout << cy << "\n"; // Outputs: 2015
+//
+// ARITHMETIC:
+//
+// Civil-time types support natural arithmetic operators such as addition,
+// subtraction, and difference. Arithmetic operates on the civil-time field
+// indicated in the type's name. Difference requires arguments with the same
+// alignment and returns the answer in units of the alignment.
+//
+// civil_day a(2015, 2, 3);
+// ++a; // 2015-02-04 00:00:00
+// --a; // 2015-02-03 00:00:00
+// civil_day b = a + 1; // 2015-02-04 00:00:00
+// civil_day c = 1 + b; // 2015-02-05 00:00:00
+// int n = c - a; // n = 2 (civil days)
+// int m = c - civil_month(c); // Won't compile: different types.
+//
+// EXAMPLE: Adding a month to January 31.
+//
+// One of the classic questions that arises when considering a civil-time
+// library (or a date library or a date/time library) is this: "What happens
+// when you add a month to January 31?" This is an interesting question
+// because there could be a number of possible answers:
+//
+// 1. March 3 (or 2 if a leap year). This may make sense if the operation
+// wants the equivalent of February 31.
+// 2. February 28 (or 29 if a leap year). This may make sense if the operation
+// wants the last day of January to go to the last day of February.
+// 3. Error. The caller may get some error, an exception, an invalid date
+// object, or maybe false is returned. This may make sense because there is
+// no single unambiguously correct answer to the question.
+//
+// Practically speaking, any answer that is not what the programmer intended
+// is the wrong answer.
+//
+// This civil-time library avoids the problem by making it impossible to ask
+// ambiguous questions. All civil-time objects are aligned to a particular
+// civil-field boundary (such as aligned to a year, month, day, hour, minute,
+// or second), and arithmetic operates on the field to which the object is
+// aligned. This means that in order to "add a month" the object must first be
+// aligned to a month boundary, which is equivalent to the first day of that
+// month.
+//
+// Of course, there are ways to compute an answer the question at hand using
+// this civil-time library, but they require the programmer to be explicit
+// about the answer they expect. To illustrate, let's see how to compute all
+// three of the above possible answers to the question of "Jan 31 plus 1
+// month":
+//
+// const civil_day d(2015, 1, 31);
+//
+// // Answer 1:
+// // Add 1 to the month field in the constructor, and rely on normalization.
+// const auto ans_normalized = civil_day(d.year(), d.month() + 1, d.day());
+// // ans_normalized == 2015-03-03 (aka Feb 31)
+//
+// // Answer 2:
+// // Add 1 to month field, capping to the end of next month.
+// const auto next_month = civil_month(d) + 1;
+// const auto last_day_of_next_month = civil_day(next_month + 1) - 1;
+// const auto ans_capped = std::min(ans_normalized, last_day_of_next_month);
+// // ans_capped == 2015-02-28
+//
+// // Answer 3:
+// // Signal an error if the normalized answer is not in next month.
+// if (civil_month(ans_normalized) != next_month) {
+// // error, month overflow
+// }
+//
+using civil_year = detail::civil_year;
+using civil_month = detail::civil_month;
+using civil_day = detail::civil_day;
+using civil_hour = detail::civil_hour;
+using civil_minute = detail::civil_minute;
+using civil_second = detail::civil_second;
+
+// An enum class with members monday, tuesday, wednesday, thursday, friday,
+// saturday, and sunday. These enum values may be sent to an output stream
+// using operator<<(). The result is the full weekday name in English with a
+// leading capital letter.
+//
+// weekday wd = weekday::thursday;
+// std::cout << wd << "\n"; // Outputs: Thursday
+//
+using detail::weekday;
+
+// Returns the weekday for the given civil-time value.
+//
+// civil_day a(2015, 8, 13);
+// weekday wd = get_weekday(a); // wd == weekday::thursday
+//
+using detail::get_weekday;
+
+// Returns the civil_day that strictly follows or precedes the given
+// civil_day, and that falls on the given weekday.
+//
+// For example, given:
+//
+// August 2015
+// Su Mo Tu We Th Fr Sa
+// 1
+// 2 3 4 5 6 7 8
+// 9 10 11 12 13 14 15
+// 16 17 18 19 20 21 22
+// 23 24 25 26 27 28 29
+// 30 31
+//
+// civil_day a(2015, 8, 13); // get_weekday(a) == weekday::thursday
+// civil_day b = next_weekday(a, weekday::thursday); // b = 2015-08-20
+// civil_day c = prev_weekday(a, weekday::thursday); // c = 2015-08-06
+//
+// civil_day d = ...
+// // Gets the following Thursday if d is not already Thursday
+// civil_day thurs1 = next_weekday(d - 1, weekday::thursday);
+// // Gets the previous Thursday if d is not already Thursday
+// civil_day thurs2 = prev_weekday(d + 1, weekday::thursday);
+//
+using detail::next_weekday;
+using detail::prev_weekday;
+
+// Returns the day-of-year for the given civil-time value.
+//
+// civil_day a(2015, 1, 1);
+// int yd_jan_1 = get_yearday(a); // yd_jan_1 = 1
+// civil_day b(2015, 12, 31);
+// int yd_dec_31 = get_yearday(b); // yd_dec_31 = 365
+//
+using detail::get_yearday;
+
+} // namespace cctz
+} // namespace time_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_TIME_INTERNAL_CCTZ_CIVIL_TIME_H_
diff --git a/third_party/abseil/src/absl/time/internal/cctz/include/cctz/civil_time_detail.h b/third_party/abseil/src/absl/time/internal/cctz/include/cctz/civil_time_detail.h
new file mode 100644
index 0000000..8aadde5
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/include/cctz/civil_time_detail.h
@@ -0,0 +1,628 @@
+// Copyright 2016 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_TIME_INTERNAL_CCTZ_CIVIL_TIME_DETAIL_H_
+#define ABSL_TIME_INTERNAL_CCTZ_CIVIL_TIME_DETAIL_H_
+
+#include <cstdint>
+#include <limits>
+#include <ostream>
+#include <type_traits>
+
+#include "absl/base/config.h"
+
+// Disable constexpr support unless we are in C++14 mode.
+#if __cpp_constexpr >= 201304 || (defined(_MSC_VER) && _MSC_VER >= 1910)
+#define CONSTEXPR_D constexpr // data
+#define CONSTEXPR_F constexpr // function
+#define CONSTEXPR_M constexpr // member
+#else
+#define CONSTEXPR_D const
+#define CONSTEXPR_F inline
+#define CONSTEXPR_M
+#endif
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace time_internal {
+namespace cctz {
+
+// Support years that at least span the range of 64-bit time_t values.
+using year_t = std::int_fast64_t;
+
+// Type alias that indicates an argument is not normalized (e.g., the
+// constructor parameters and operands/results of addition/subtraction).
+using diff_t = std::int_fast64_t;
+
+namespace detail {
+
+// Type aliases that indicate normalized argument values.
+using month_t = std::int_fast8_t; // [1:12]
+using day_t = std::int_fast8_t; // [1:31]
+using hour_t = std::int_fast8_t; // [0:23]
+using minute_t = std::int_fast8_t; // [0:59]
+using second_t = std::int_fast8_t; // [0:59]
+
+// Normalized civil-time fields: Y-M-D HH:MM:SS.
+struct fields {
+ CONSTEXPR_M fields(year_t year, month_t month, day_t day, hour_t hour,
+ minute_t minute, second_t second)
+ : y(year), m(month), d(day), hh(hour), mm(minute), ss(second) {}
+ std::int_least64_t y;
+ std::int_least8_t m;
+ std::int_least8_t d;
+ std::int_least8_t hh;
+ std::int_least8_t mm;
+ std::int_least8_t ss;
+};
+
+struct second_tag {};
+struct minute_tag : second_tag {};
+struct hour_tag : minute_tag {};
+struct day_tag : hour_tag {};
+struct month_tag : day_tag {};
+struct year_tag : month_tag {};
+
+////////////////////////////////////////////////////////////////////////
+
+// Field normalization (without avoidable overflow).
+
+namespace impl {
+
+CONSTEXPR_F bool is_leap_year(year_t y) noexcept {
+ return y % 4 == 0 && (y % 100 != 0 || y % 400 == 0);
+}
+CONSTEXPR_F int year_index(year_t y, month_t m) noexcept {
+ return (static_cast<int>((y + (m > 2)) % 400) + 400) % 400;
+}
+CONSTEXPR_F int days_per_century(year_t y, month_t m) noexcept {
+ const int yi = year_index(y, m);
+ return 36524 + (yi == 0 || yi > 300);
+}
+CONSTEXPR_F int days_per_4years(year_t y, month_t m) noexcept {
+ const int yi = year_index(y, m);
+ return 1460 + (yi == 0 || yi > 300 || (yi - 1) % 100 < 96);
+}
+CONSTEXPR_F int days_per_year(year_t y, month_t m) noexcept {
+ return is_leap_year(y + (m > 2)) ? 366 : 365;
+}
+CONSTEXPR_F int days_per_month(year_t y, month_t m) noexcept {
+ CONSTEXPR_D int k_days_per_month[1 + 12] = {
+ -1, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 // non leap year
+ };
+ return k_days_per_month[m] + (m == 2 && is_leap_year(y));
+}
+
+CONSTEXPR_F fields n_day(year_t y, month_t m, diff_t d, diff_t cd, hour_t hh,
+ minute_t mm, second_t ss) noexcept {
+ year_t ey = y % 400;
+ const year_t oey = ey;
+ ey += (cd / 146097) * 400;
+ cd %= 146097;
+ if (cd < 0) {
+ ey -= 400;
+ cd += 146097;
+ }
+ ey += (d / 146097) * 400;
+ d = d % 146097 + cd;
+ if (d > 0) {
+ if (d > 146097) {
+ ey += 400;
+ d -= 146097;
+ }
+ } else {
+ if (d > -365) {
+ // We often hit the previous year when stepping a civil time backwards,
+ // so special case it to avoid counting up by 100/4/1-year chunks.
+ ey -= 1;
+ d += days_per_year(ey, m);
+ } else {
+ ey -= 400;
+ d += 146097;
+ }
+ }
+ if (d > 365) {
+ for (;;) {
+ int n = days_per_century(ey, m);
+ if (d <= n) break;
+ d -= n;
+ ey += 100;
+ }
+ for (;;) {
+ int n = days_per_4years(ey, m);
+ if (d <= n) break;
+ d -= n;
+ ey += 4;
+ }
+ for (;;) {
+ int n = days_per_year(ey, m);
+ if (d <= n) break;
+ d -= n;
+ ++ey;
+ }
+ }
+ if (d > 28) {
+ for (;;) {
+ int n = days_per_month(ey, m);
+ if (d <= n) break;
+ d -= n;
+ if (++m > 12) {
+ ++ey;
+ m = 1;
+ }
+ }
+ }
+ return fields(y + (ey - oey), m, static_cast<day_t>(d), hh, mm, ss);
+}
+CONSTEXPR_F fields n_mon(year_t y, diff_t m, diff_t d, diff_t cd, hour_t hh,
+ minute_t mm, second_t ss) noexcept {
+ if (m != 12) {
+ y += m / 12;
+ m %= 12;
+ if (m <= 0) {
+ y -= 1;
+ m += 12;
+ }
+ }
+ return n_day(y, static_cast<month_t>(m), d, cd, hh, mm, ss);
+}
+CONSTEXPR_F fields n_hour(year_t y, diff_t m, diff_t d, diff_t cd, diff_t hh,
+ minute_t mm, second_t ss) noexcept {
+ cd += hh / 24;
+ hh %= 24;
+ if (hh < 0) {
+ cd -= 1;
+ hh += 24;
+ }
+ return n_mon(y, m, d, cd, static_cast<hour_t>(hh), mm, ss);
+}
+CONSTEXPR_F fields n_min(year_t y, diff_t m, diff_t d, diff_t hh, diff_t ch,
+ diff_t mm, second_t ss) noexcept {
+ ch += mm / 60;
+ mm %= 60;
+ if (mm < 0) {
+ ch -= 1;
+ mm += 60;
+ }
+ return n_hour(y, m, d, hh / 24 + ch / 24, hh % 24 + ch % 24,
+ static_cast<minute_t>(mm), ss);
+}
+CONSTEXPR_F fields n_sec(year_t y, diff_t m, diff_t d, diff_t hh, diff_t mm,
+ diff_t ss) noexcept {
+ // Optimization for when (non-constexpr) fields are already normalized.
+ if (0 <= ss && ss < 60) {
+ const second_t nss = static_cast<second_t>(ss);
+ if (0 <= mm && mm < 60) {
+ const minute_t nmm = static_cast<minute_t>(mm);
+ if (0 <= hh && hh < 24) {
+ const hour_t nhh = static_cast<hour_t>(hh);
+ if (1 <= d && d <= 28 && 1 <= m && m <= 12) {
+ const day_t nd = static_cast<day_t>(d);
+ const month_t nm = static_cast<month_t>(m);
+ return fields(y, nm, nd, nhh, nmm, nss);
+ }
+ return n_mon(y, m, d, 0, nhh, nmm, nss);
+ }
+ return n_hour(y, m, d, hh / 24, hh % 24, nmm, nss);
+ }
+ return n_min(y, m, d, hh, mm / 60, mm % 60, nss);
+ }
+ diff_t cm = ss / 60;
+ ss %= 60;
+ if (ss < 0) {
+ cm -= 1;
+ ss += 60;
+ }
+ return n_min(y, m, d, hh, mm / 60 + cm / 60, mm % 60 + cm % 60,
+ static_cast<second_t>(ss));
+}
+
+} // namespace impl
+
+////////////////////////////////////////////////////////////////////////
+
+// Increments the indicated (normalized) field by "n".
+CONSTEXPR_F fields step(second_tag, fields f, diff_t n) noexcept {
+ return impl::n_sec(f.y, f.m, f.d, f.hh, f.mm + n / 60, f.ss + n % 60);
+}
+CONSTEXPR_F fields step(minute_tag, fields f, diff_t n) noexcept {
+ return impl::n_min(f.y, f.m, f.d, f.hh + n / 60, 0, f.mm + n % 60, f.ss);
+}
+CONSTEXPR_F fields step(hour_tag, fields f, diff_t n) noexcept {
+ return impl::n_hour(f.y, f.m, f.d + n / 24, 0, f.hh + n % 24, f.mm, f.ss);
+}
+CONSTEXPR_F fields step(day_tag, fields f, diff_t n) noexcept {
+ return impl::n_day(f.y, f.m, f.d, n, f.hh, f.mm, f.ss);
+}
+CONSTEXPR_F fields step(month_tag, fields f, diff_t n) noexcept {
+ return impl::n_mon(f.y + n / 12, f.m + n % 12, f.d, 0, f.hh, f.mm, f.ss);
+}
+CONSTEXPR_F fields step(year_tag, fields f, diff_t n) noexcept {
+ return fields(f.y + n, f.m, f.d, f.hh, f.mm, f.ss);
+}
+
+////////////////////////////////////////////////////////////////////////
+
+namespace impl {
+
+// Returns (v * f + a) but avoiding intermediate overflow when possible.
+CONSTEXPR_F diff_t scale_add(diff_t v, diff_t f, diff_t a) noexcept {
+ return (v < 0) ? ((v + 1) * f + a) - f : ((v - 1) * f + a) + f;
+}
+
+// Map a (normalized) Y/M/D to the number of days before/after 1970-01-01.
+// Probably overflows for years outside [-292277022656:292277026595].
+CONSTEXPR_F diff_t ymd_ord(year_t y, month_t m, day_t d) noexcept {
+ const diff_t eyear = (m <= 2) ? y - 1 : y;
+ const diff_t era = (eyear >= 0 ? eyear : eyear - 399) / 400;
+ const diff_t yoe = eyear - era * 400;
+ const diff_t doy = (153 * (m + (m > 2 ? -3 : 9)) + 2) / 5 + d - 1;
+ const diff_t doe = yoe * 365 + yoe / 4 - yoe / 100 + doy;
+ return era * 146097 + doe - 719468;
+}
+
+// Returns the difference in days between two normalized Y-M-D tuples.
+// ymd_ord() will encounter integer overflow given extreme year values,
+// yet the difference between two such extreme values may actually be
+// small, so we take a little care to avoid overflow when possible by
+// exploiting the 146097-day cycle.
+CONSTEXPR_F diff_t day_difference(year_t y1, month_t m1, day_t d1, year_t y2,
+ month_t m2, day_t d2) noexcept {
+ const diff_t a_c4_off = y1 % 400;
+ const diff_t b_c4_off = y2 % 400;
+ diff_t c4_diff = (y1 - a_c4_off) - (y2 - b_c4_off);
+ diff_t delta = ymd_ord(a_c4_off, m1, d1) - ymd_ord(b_c4_off, m2, d2);
+ if (c4_diff > 0 && delta < 0) {
+ delta += 2 * 146097;
+ c4_diff -= 2 * 400;
+ } else if (c4_diff < 0 && delta > 0) {
+ delta -= 2 * 146097;
+ c4_diff += 2 * 400;
+ }
+ return (c4_diff / 400 * 146097) + delta;
+}
+
+} // namespace impl
+
+// Returns the difference between fields structs using the indicated unit.
+CONSTEXPR_F diff_t difference(year_tag, fields f1, fields f2) noexcept {
+ return f1.y - f2.y;
+}
+CONSTEXPR_F diff_t difference(month_tag, fields f1, fields f2) noexcept {
+ return impl::scale_add(difference(year_tag{}, f1, f2), 12, (f1.m - f2.m));
+}
+CONSTEXPR_F diff_t difference(day_tag, fields f1, fields f2) noexcept {
+ return impl::day_difference(f1.y, f1.m, f1.d, f2.y, f2.m, f2.d);
+}
+CONSTEXPR_F diff_t difference(hour_tag, fields f1, fields f2) noexcept {
+ return impl::scale_add(difference(day_tag{}, f1, f2), 24, (f1.hh - f2.hh));
+}
+CONSTEXPR_F diff_t difference(minute_tag, fields f1, fields f2) noexcept {
+ return impl::scale_add(difference(hour_tag{}, f1, f2), 60, (f1.mm - f2.mm));
+}
+CONSTEXPR_F diff_t difference(second_tag, fields f1, fields f2) noexcept {
+ return impl::scale_add(difference(minute_tag{}, f1, f2), 60, f1.ss - f2.ss);
+}
+
+////////////////////////////////////////////////////////////////////////
+
+// Aligns the (normalized) fields struct to the indicated field.
+CONSTEXPR_F fields align(second_tag, fields f) noexcept { return f; }
+CONSTEXPR_F fields align(minute_tag, fields f) noexcept {
+ return fields{f.y, f.m, f.d, f.hh, f.mm, 0};
+}
+CONSTEXPR_F fields align(hour_tag, fields f) noexcept {
+ return fields{f.y, f.m, f.d, f.hh, 0, 0};
+}
+CONSTEXPR_F fields align(day_tag, fields f) noexcept {
+ return fields{f.y, f.m, f.d, 0, 0, 0};
+}
+CONSTEXPR_F fields align(month_tag, fields f) noexcept {
+ return fields{f.y, f.m, 1, 0, 0, 0};
+}
+CONSTEXPR_F fields align(year_tag, fields f) noexcept {
+ return fields{f.y, 1, 1, 0, 0, 0};
+}
+
+////////////////////////////////////////////////////////////////////////
+
+namespace impl {
+
+template <typename H>
+H AbslHashValueImpl(second_tag, H h, fields f) {
+ return H::combine(std::move(h), f.y, f.m, f.d, f.hh, f.mm, f.ss);
+}
+template <typename H>
+H AbslHashValueImpl(minute_tag, H h, fields f) {
+ return H::combine(std::move(h), f.y, f.m, f.d, f.hh, f.mm);
+}
+template <typename H>
+H AbslHashValueImpl(hour_tag, H h, fields f) {
+ return H::combine(std::move(h), f.y, f.m, f.d, f.hh);
+}
+template <typename H>
+H AbslHashValueImpl(day_tag, H h, fields f) {
+ return H::combine(std::move(h), f.y, f.m, f.d);
+}
+template <typename H>
+H AbslHashValueImpl(month_tag, H h, fields f) {
+ return H::combine(std::move(h), f.y, f.m);
+}
+template <typename H>
+H AbslHashValueImpl(year_tag, H h, fields f) {
+ return H::combine(std::move(h), f.y);
+}
+
+} // namespace impl
+
+////////////////////////////////////////////////////////////////////////
+
+template <typename T>
+class civil_time {
+ public:
+ explicit CONSTEXPR_M civil_time(year_t y, diff_t m = 1, diff_t d = 1,
+ diff_t hh = 0, diff_t mm = 0,
+ diff_t ss = 0) noexcept
+ : civil_time(impl::n_sec(y, m, d, hh, mm, ss)) {}
+
+ CONSTEXPR_M civil_time() noexcept : f_{1970, 1, 1, 0, 0, 0} {}
+ civil_time(const civil_time&) = default;
+ civil_time& operator=(const civil_time&) = default;
+
+ // Conversion between civil times of different alignment. Conversion to
+ // a more precise alignment is allowed implicitly (e.g., day -> hour),
+ // but conversion where information is discarded must be explicit
+ // (e.g., second -> minute).
+ template <typename U, typename S>
+ using preserves_data =
+ typename std::enable_if<std::is_base_of<U, S>::value>::type;
+ template <typename U>
+ CONSTEXPR_M civil_time(const civil_time<U>& ct,
+ preserves_data<T, U>* = nullptr) noexcept
+ : civil_time(ct.f_) {}
+ template <typename U>
+ explicit CONSTEXPR_M civil_time(const civil_time<U>& ct,
+ preserves_data<U, T>* = nullptr) noexcept
+ : civil_time(ct.f_) {}
+
+ // Factories for the maximum/minimum representable civil_time.
+ static CONSTEXPR_F civil_time(max)() {
+ const auto max_year = (std::numeric_limits<std::int_least64_t>::max)();
+ return civil_time(max_year, 12, 31, 23, 59, 59);
+ }
+ static CONSTEXPR_F civil_time(min)() {
+ const auto min_year = (std::numeric_limits<std::int_least64_t>::min)();
+ return civil_time(min_year, 1, 1, 0, 0, 0);
+ }
+
+ // Field accessors. Note: All but year() return an int.
+ CONSTEXPR_M year_t year() const noexcept { return f_.y; }
+ CONSTEXPR_M int month() const noexcept { return f_.m; }
+ CONSTEXPR_M int day() const noexcept { return f_.d; }
+ CONSTEXPR_M int hour() const noexcept { return f_.hh; }
+ CONSTEXPR_M int minute() const noexcept { return f_.mm; }
+ CONSTEXPR_M int second() const noexcept { return f_.ss; }
+
+ // Assigning arithmetic.
+ CONSTEXPR_M civil_time& operator+=(diff_t n) noexcept {
+ return *this = *this + n;
+ }
+ CONSTEXPR_M civil_time& operator-=(diff_t n) noexcept {
+ return *this = *this - n;
+ }
+ CONSTEXPR_M civil_time& operator++() noexcept { return *this += 1; }
+ CONSTEXPR_M civil_time operator++(int) noexcept {
+ const civil_time a = *this;
+ ++*this;
+ return a;
+ }
+ CONSTEXPR_M civil_time& operator--() noexcept { return *this -= 1; }
+ CONSTEXPR_M civil_time operator--(int) noexcept {
+ const civil_time a = *this;
+ --*this;
+ return a;
+ }
+
+ // Binary arithmetic operators.
+ friend CONSTEXPR_F civil_time operator+(civil_time a, diff_t n) noexcept {
+ return civil_time(step(T{}, a.f_, n));
+ }
+ friend CONSTEXPR_F civil_time operator+(diff_t n, civil_time a) noexcept {
+ return a + n;
+ }
+ friend CONSTEXPR_F civil_time operator-(civil_time a, diff_t n) noexcept {
+ return n != (std::numeric_limits<diff_t>::min)()
+ ? civil_time(step(T{}, a.f_, -n))
+ : civil_time(step(T{}, step(T{}, a.f_, -(n + 1)), 1));
+ }
+ friend CONSTEXPR_F diff_t operator-(civil_time lhs, civil_time rhs) noexcept {
+ return difference(T{}, lhs.f_, rhs.f_);
+ }
+
+ template <typename H>
+ friend H AbslHashValue(H h, civil_time a) {
+ return impl::AbslHashValueImpl(T{}, std::move(h), a.f_);
+ }
+
+ private:
+ // All instantiations of this template are allowed to call the following
+ // private constructor and access the private fields member.
+ template <typename U>
+ friend class civil_time;
+
+ // The designated constructor that all others eventually call.
+ explicit CONSTEXPR_M civil_time(fields f) noexcept : f_(align(T{}, f)) {}
+
+ fields f_;
+};
+
+// Disallows difference between differently aligned types.
+// auto n = civil_day(...) - civil_hour(...); // would be confusing.
+template <typename T, typename U>
+CONSTEXPR_F diff_t operator-(civil_time<T>, civil_time<U>) = delete;
+
+using civil_year = civil_time<year_tag>;
+using civil_month = civil_time<month_tag>;
+using civil_day = civil_time<day_tag>;
+using civil_hour = civil_time<hour_tag>;
+using civil_minute = civil_time<minute_tag>;
+using civil_second = civil_time<second_tag>;
+
+////////////////////////////////////////////////////////////////////////
+
+// Relational operators that work with differently aligned objects.
+// Always compares all six fields.
+template <typename T1, typename T2>
+CONSTEXPR_F bool operator<(const civil_time<T1>& lhs,
+ const civil_time<T2>& rhs) noexcept {
+ return (
+ lhs.year() < rhs.year() ||
+ (lhs.year() == rhs.year() &&
+ (lhs.month() < rhs.month() ||
+ (lhs.month() == rhs.month() &&
+ (lhs.day() < rhs.day() || (lhs.day() == rhs.day() &&
+ (lhs.hour() < rhs.hour() ||
+ (lhs.hour() == rhs.hour() &&
+ (lhs.minute() < rhs.minute() ||
+ (lhs.minute() == rhs.minute() &&
+ (lhs.second() < rhs.second())))))))))));
+}
+template <typename T1, typename T2>
+CONSTEXPR_F bool operator<=(const civil_time<T1>& lhs,
+ const civil_time<T2>& rhs) noexcept {
+ return !(rhs < lhs);
+}
+template <typename T1, typename T2>
+CONSTEXPR_F bool operator>=(const civil_time<T1>& lhs,
+ const civil_time<T2>& rhs) noexcept {
+ return !(lhs < rhs);
+}
+template <typename T1, typename T2>
+CONSTEXPR_F bool operator>(const civil_time<T1>& lhs,
+ const civil_time<T2>& rhs) noexcept {
+ return rhs < lhs;
+}
+template <typename T1, typename T2>
+CONSTEXPR_F bool operator==(const civil_time<T1>& lhs,
+ const civil_time<T2>& rhs) noexcept {
+ return lhs.year() == rhs.year() && lhs.month() == rhs.month() &&
+ lhs.day() == rhs.day() && lhs.hour() == rhs.hour() &&
+ lhs.minute() == rhs.minute() && lhs.second() == rhs.second();
+}
+template <typename T1, typename T2>
+CONSTEXPR_F bool operator!=(const civil_time<T1>& lhs,
+ const civil_time<T2>& rhs) noexcept {
+ return !(lhs == rhs);
+}
+
+////////////////////////////////////////////////////////////////////////
+
+enum class weekday {
+ monday,
+ tuesday,
+ wednesday,
+ thursday,
+ friday,
+ saturday,
+ sunday,
+};
+
+CONSTEXPR_F weekday get_weekday(const civil_second& cs) noexcept {
+ CONSTEXPR_D weekday k_weekday_by_mon_off[13] = {
+ weekday::monday, weekday::tuesday, weekday::wednesday,
+ weekday::thursday, weekday::friday, weekday::saturday,
+ weekday::sunday, weekday::monday, weekday::tuesday,
+ weekday::wednesday, weekday::thursday, weekday::friday,
+ weekday::saturday,
+ };
+ CONSTEXPR_D int k_weekday_offsets[1 + 12] = {
+ -1, 0, 3, 2, 5, 0, 3, 5, 1, 4, 6, 2, 4,
+ };
+ year_t wd = 2400 + (cs.year() % 400) - (cs.month() < 3);
+ wd += wd / 4 - wd / 100 + wd / 400;
+ wd += k_weekday_offsets[cs.month()] + cs.day();
+ return k_weekday_by_mon_off[wd % 7 + 6];
+}
+
+////////////////////////////////////////////////////////////////////////
+
+CONSTEXPR_F civil_day next_weekday(civil_day cd, weekday wd) noexcept {
+ CONSTEXPR_D weekday k_weekdays_forw[14] = {
+ weekday::monday, weekday::tuesday, weekday::wednesday,
+ weekday::thursday, weekday::friday, weekday::saturday,
+ weekday::sunday, weekday::monday, weekday::tuesday,
+ weekday::wednesday, weekday::thursday, weekday::friday,
+ weekday::saturday, weekday::sunday,
+ };
+ weekday base = get_weekday(cd);
+ for (int i = 0;; ++i) {
+ if (base == k_weekdays_forw[i]) {
+ for (int j = i + 1;; ++j) {
+ if (wd == k_weekdays_forw[j]) {
+ return cd + (j - i);
+ }
+ }
+ }
+ }
+}
+
+CONSTEXPR_F civil_day prev_weekday(civil_day cd, weekday wd) noexcept {
+ CONSTEXPR_D weekday k_weekdays_back[14] = {
+ weekday::sunday, weekday::saturday, weekday::friday,
+ weekday::thursday, weekday::wednesday, weekday::tuesday,
+ weekday::monday, weekday::sunday, weekday::saturday,
+ weekday::friday, weekday::thursday, weekday::wednesday,
+ weekday::tuesday, weekday::monday,
+ };
+ weekday base = get_weekday(cd);
+ for (int i = 0;; ++i) {
+ if (base == k_weekdays_back[i]) {
+ for (int j = i + 1;; ++j) {
+ if (wd == k_weekdays_back[j]) {
+ return cd - (j - i);
+ }
+ }
+ }
+ }
+}
+
+CONSTEXPR_F int get_yearday(const civil_second& cs) noexcept {
+ CONSTEXPR_D int k_month_offsets[1 + 12] = {
+ -1, 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334,
+ };
+ const int feb29 = (cs.month() > 2 && impl::is_leap_year(cs.year()));
+ return k_month_offsets[cs.month()] + feb29 + cs.day();
+}
+
+////////////////////////////////////////////////////////////////////////
+
+std::ostream& operator<<(std::ostream& os, const civil_year& y);
+std::ostream& operator<<(std::ostream& os, const civil_month& m);
+std::ostream& operator<<(std::ostream& os, const civil_day& d);
+std::ostream& operator<<(std::ostream& os, const civil_hour& h);
+std::ostream& operator<<(std::ostream& os, const civil_minute& m);
+std::ostream& operator<<(std::ostream& os, const civil_second& s);
+std::ostream& operator<<(std::ostream& os, weekday wd);
+
+} // namespace detail
+} // namespace cctz
+} // namespace time_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#undef CONSTEXPR_M
+#undef CONSTEXPR_F
+#undef CONSTEXPR_D
+
+#endif // ABSL_TIME_INTERNAL_CCTZ_CIVIL_TIME_DETAIL_H_
diff --git a/third_party/abseil/src/absl/time/internal/cctz/include/cctz/time_zone.h b/third_party/abseil/src/absl/time/internal/cctz/include/cctz/time_zone.h
new file mode 100644
index 0000000..5562a37
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/include/cctz/time_zone.h
@@ -0,0 +1,386 @@
+// Copyright 2016 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// A library for translating between absolute times (represented by
+// std::chrono::time_points of the std::chrono::system_clock) and civil
+// times (represented by cctz::civil_second) using the rules defined by
+// a time zone (cctz::time_zone).
+
+#ifndef ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_H_
+#define ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_H_
+
+#include <chrono>
+#include <cstdint>
+#include <string>
+#include <utility>
+
+#include "absl/base/config.h"
+#include "absl/time/internal/cctz/include/cctz/civil_time.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace time_internal {
+namespace cctz {
+
+// Convenience aliases. Not intended as public API points.
+template <typename D>
+using time_point = std::chrono::time_point<std::chrono::system_clock, D>;
+using seconds = std::chrono::duration<std::int_fast64_t>;
+using sys_seconds = seconds; // Deprecated. Use cctz::seconds instead.
+
+namespace detail {
+template <typename D>
+inline std::pair<time_point<seconds>, D> split_seconds(
+ const time_point<D>& tp) {
+ auto sec = std::chrono::time_point_cast<seconds>(tp);
+ auto sub = tp - sec;
+ if (sub.count() < 0) {
+ sec -= seconds(1);
+ sub += seconds(1);
+ }
+ return {sec, std::chrono::duration_cast<D>(sub)};
+}
+inline std::pair<time_point<seconds>, seconds> split_seconds(
+ const time_point<seconds>& tp) {
+ return {tp, seconds::zero()};
+}
+} // namespace detail
+
+// cctz::time_zone is an opaque, small, value-type class representing a
+// geo-political region within which particular rules are used for mapping
+// between absolute and civil times. Time zones are named using the TZ
+// identifiers from the IANA Time Zone Database, such as "America/Los_Angeles"
+// or "Australia/Sydney". Time zones are created from factory functions such
+// as load_time_zone(). Note: strings like "PST" and "EDT" are not valid TZ
+// identifiers.
+//
+// Example:
+// cctz::time_zone utc = cctz::utc_time_zone();
+// cctz::time_zone pst = cctz::fixed_time_zone(std::chrono::hours(-8));
+// cctz::time_zone loc = cctz::local_time_zone();
+// cctz::time_zone lax;
+// if (!cctz::load_time_zone("America/Los_Angeles", &lax)) { ... }
+//
+// See also:
+// - http://www.iana.org/time-zones
+// - https://en.wikipedia.org/wiki/Zoneinfo
+class time_zone {
+ public:
+ time_zone() : time_zone(nullptr) {} // Equivalent to UTC
+ time_zone(const time_zone&) = default;
+ time_zone& operator=(const time_zone&) = default;
+
+ std::string name() const;
+
+ // An absolute_lookup represents the civil time (cctz::civil_second) within
+ // this time_zone at the given absolute time (time_point). There are
+ // additionally a few other fields that may be useful when working with
+ // older APIs, such as std::tm.
+ //
+ // Example:
+ // const cctz::time_zone tz = ...
+ // const auto tp = std::chrono::system_clock::now();
+ // const cctz::time_zone::absolute_lookup al = tz.lookup(tp);
+ struct absolute_lookup {
+ civil_second cs;
+ // Note: The following fields exist for backward compatibility with older
+ // APIs. Accessing these fields directly is a sign of imprudent logic in
+ // the calling code. Modern time-related code should only access this data
+ // indirectly by way of cctz::format().
+ int offset; // civil seconds east of UTC
+ bool is_dst; // is offset non-standard?
+ const char* abbr; // time-zone abbreviation (e.g., "PST")
+ };
+ absolute_lookup lookup(const time_point<seconds>& tp) const;
+ template <typename D>
+ absolute_lookup lookup(const time_point<D>& tp) const {
+ return lookup(detail::split_seconds(tp).first);
+ }
+
+ // A civil_lookup represents the absolute time(s) (time_point) that
+ // correspond to the given civil time (cctz::civil_second) within this
+ // time_zone. Usually the given civil time represents a unique instant
+ // in time, in which case the conversion is unambiguous. However,
+ // within this time zone, the given civil time may be skipped (e.g.,
+ // during a positive UTC offset shift), or repeated (e.g., during a
+ // negative UTC offset shift). To account for these possibilities,
+ // civil_lookup is richer than just a single time_point.
+ //
+ // In all cases the civil_lookup::kind enum will indicate the nature
+ // of the given civil-time argument, and the pre, trans, and post
+ // members will give the absolute time answers using the pre-transition
+ // offset, the transition point itself, and the post-transition offset,
+ // respectively (all three times are equal if kind == UNIQUE). If any
+ // of these three absolute times is outside the representable range of a
+ // time_point<seconds> the field is set to its maximum/minimum value.
+ //
+ // Example:
+ // cctz::time_zone lax;
+ // if (!cctz::load_time_zone("America/Los_Angeles", &lax)) { ... }
+ //
+ // // A unique civil time.
+ // auto jan01 = lax.lookup(cctz::civil_second(2011, 1, 1, 0, 0, 0));
+ // // jan01.kind == cctz::time_zone::civil_lookup::UNIQUE
+ // // jan01.pre is 2011/01/01 00:00:00 -0800
+ // // jan01.trans is 2011/01/01 00:00:00 -0800
+ // // jan01.post is 2011/01/01 00:00:00 -0800
+ //
+ // // A Spring DST transition, when there is a gap in civil time.
+ // auto mar13 = lax.lookup(cctz::civil_second(2011, 3, 13, 2, 15, 0));
+ // // mar13.kind == cctz::time_zone::civil_lookup::SKIPPED
+ // // mar13.pre is 2011/03/13 03:15:00 -0700
+ // // mar13.trans is 2011/03/13 03:00:00 -0700
+ // // mar13.post is 2011/03/13 01:15:00 -0800
+ //
+ // // A Fall DST transition, when civil times are repeated.
+ // auto nov06 = lax.lookup(cctz::civil_second(2011, 11, 6, 1, 15, 0));
+ // // nov06.kind == cctz::time_zone::civil_lookup::REPEATED
+ // // nov06.pre is 2011/11/06 01:15:00 -0700
+ // // nov06.trans is 2011/11/06 01:00:00 -0800
+ // // nov06.post is 2011/11/06 01:15:00 -0800
+ struct civil_lookup {
+ enum civil_kind {
+ UNIQUE, // the civil time was singular (pre == trans == post)
+ SKIPPED, // the civil time did not exist (pre >= trans > post)
+ REPEATED, // the civil time was ambiguous (pre < trans <= post)
+ } kind;
+ time_point<seconds> pre; // uses the pre-transition offset
+ time_point<seconds> trans; // instant of civil-offset change
+ time_point<seconds> post; // uses the post-transition offset
+ };
+ civil_lookup lookup(const civil_second& cs) const;
+
+ // Finds the time of the next/previous offset change in this time zone.
+ //
+ // By definition, next_transition(tp, &trans) returns false when tp has
+ // its maximum value, and prev_transition(tp, &trans) returns false
+ // when tp has its minimum value. If the zone has no transitions, the
+ // result will also be false no matter what the argument.
+ //
+ // Otherwise, when tp has its minimum value, next_transition(tp, &trans)
+ // returns true and sets trans to the first recorded transition. Chains
+ // of calls to next_transition()/prev_transition() will eventually return
+ // false, but it is unspecified exactly when next_transition(tp, &trans)
+ // jumps to false, or what time is set by prev_transition(tp, &trans) for
+ // a very distant tp.
+ //
+ // Note: Enumeration of time-zone transitions is for informational purposes
+ // only. Modern time-related code should not care about when offset changes
+ // occur.
+ //
+ // Example:
+ // cctz::time_zone nyc;
+ // if (!cctz::load_time_zone("America/New_York", &nyc)) { ... }
+ // const auto now = std::chrono::system_clock::now();
+ // auto tp = cctz::time_point<cctz::seconds>::min();
+ // cctz::time_zone::civil_transition trans;
+ // while (tp <= now && nyc.next_transition(tp, &trans)) {
+ // // transition: trans.from -> trans.to
+ // tp = nyc.lookup(trans.to).trans;
+ // }
+ struct civil_transition {
+ civil_second from; // the civil time we jump from
+ civil_second to; // the civil time we jump to
+ };
+ bool next_transition(const time_point<seconds>& tp,
+ civil_transition* trans) const;
+ template <typename D>
+ bool next_transition(const time_point<D>& tp, civil_transition* trans) const {
+ return next_transition(detail::split_seconds(tp).first, trans);
+ }
+ bool prev_transition(const time_point<seconds>& tp,
+ civil_transition* trans) const;
+ template <typename D>
+ bool prev_transition(const time_point<D>& tp, civil_transition* trans) const {
+ return prev_transition(detail::split_seconds(tp).first, trans);
+ }
+
+ // version() and description() provide additional information about the
+ // time zone. The content of each of the returned strings is unspecified,
+ // however, when the IANA Time Zone Database is the underlying data source
+ // the version() string will be in the familar form (e.g, "2018e") or
+ // empty when unavailable.
+ //
+ // Note: These functions are for informational or testing purposes only.
+ std::string version() const; // empty when unknown
+ std::string description() const;
+
+ // Relational operators.
+ friend bool operator==(time_zone lhs, time_zone rhs) {
+ return &lhs.effective_impl() == &rhs.effective_impl();
+ }
+ friend bool operator!=(time_zone lhs, time_zone rhs) { return !(lhs == rhs); }
+
+ template <typename H>
+ friend H AbslHashValue(H h, time_zone tz) {
+ return H::combine(std::move(h), &tz.effective_impl());
+ }
+
+ class Impl;
+
+ private:
+ explicit time_zone(const Impl* impl) : impl_(impl) {}
+ const Impl& effective_impl() const; // handles implicit UTC
+ const Impl* impl_;
+};
+
+// Loads the named time zone. May perform I/O on the initial load.
+// If the name is invalid, or some other kind of error occurs, returns
+// false and "*tz" is set to the UTC time zone.
+bool load_time_zone(const std::string& name, time_zone* tz);
+
+// Returns a time_zone representing UTC. Cannot fail.
+time_zone utc_time_zone();
+
+// Returns a time zone that is a fixed offset (seconds east) from UTC.
+// Note: If the absolute value of the offset is greater than 24 hours
+// you'll get UTC (i.e., zero offset) instead.
+time_zone fixed_time_zone(const seconds& offset);
+
+// Returns a time zone representing the local time zone. Falls back to UTC.
+// Note: local_time_zone.name() may only be something like "localtime".
+time_zone local_time_zone();
+
+// Returns the civil time (cctz::civil_second) within the given time zone at
+// the given absolute time (time_point). Since the additional fields provided
+// by the time_zone::absolute_lookup struct should rarely be needed in modern
+// code, this convert() function is simpler and should be preferred.
+template <typename D>
+inline civil_second convert(const time_point<D>& tp, const time_zone& tz) {
+ return tz.lookup(tp).cs;
+}
+
+// Returns the absolute time (time_point) that corresponds to the given civil
+// time within the given time zone. If the civil time is not unique (i.e., if
+// it was either repeated or non-existent), then the returned time_point is
+// the best estimate that preserves relative order. That is, this function
+// guarantees that if cs1 < cs2, then convert(cs1, tz) <= convert(cs2, tz).
+inline time_point<seconds> convert(const civil_second& cs,
+ const time_zone& tz) {
+ const time_zone::civil_lookup cl = tz.lookup(cs);
+ if (cl.kind == time_zone::civil_lookup::SKIPPED) return cl.trans;
+ return cl.pre;
+}
+
+namespace detail {
+using femtoseconds = std::chrono::duration<std::int_fast64_t, std::femto>;
+std::string format(const std::string&, const time_point<seconds>&,
+ const femtoseconds&, const time_zone&);
+bool parse(const std::string&, const std::string&, const time_zone&,
+ time_point<seconds>*, femtoseconds*, std::string* err = nullptr);
+} // namespace detail
+
+// Formats the given time_point in the given cctz::time_zone according to
+// the provided format string. Uses strftime()-like formatting options,
+// with the following extensions:
+//
+// - %Ez - RFC3339-compatible numeric UTC offset (+hh:mm or -hh:mm)
+// - %E*z - Full-resolution numeric UTC offset (+hh:mm:ss or -hh:mm:ss)
+// - %E#S - Seconds with # digits of fractional precision
+// - %E*S - Seconds with full fractional precision (a literal '*')
+// - %E#f - Fractional seconds with # digits of precision
+// - %E*f - Fractional seconds with full precision (a literal '*')
+// - %E4Y - Four-character years (-999 ... -001, 0000, 0001 ... 9999)
+// - %ET - The RFC3339 "date-time" separator "T"
+//
+// Note that %E0S behaves like %S, and %E0f produces no characters. In
+// contrast %E*f always produces at least one digit, which may be '0'.
+//
+// Note that %Y produces as many characters as it takes to fully render the
+// year. A year outside of [-999:9999] when formatted with %E4Y will produce
+// more than four characters, just like %Y.
+//
+// Tip: Format strings should include the UTC offset (e.g., %z, %Ez, or %E*z)
+// so that the resulting string uniquely identifies an absolute time.
+//
+// Example:
+// cctz::time_zone lax;
+// if (!cctz::load_time_zone("America/Los_Angeles", &lax)) { ... }
+// auto tp = cctz::convert(cctz::civil_second(2013, 1, 2, 3, 4, 5), lax);
+// std::string f = cctz::format("%H:%M:%S", tp, lax); // "03:04:05"
+// f = cctz::format("%H:%M:%E3S", tp, lax); // "03:04:05.000"
+template <typename D>
+inline std::string format(const std::string& fmt, const time_point<D>& tp,
+ const time_zone& tz) {
+ const auto p = detail::split_seconds(tp);
+ const auto n = std::chrono::duration_cast<detail::femtoseconds>(p.second);
+ return detail::format(fmt, p.first, n, tz);
+}
+
+// Parses an input string according to the provided format string and
+// returns the corresponding time_point. Uses strftime()-like formatting
+// options, with the same extensions as cctz::format(), but with the
+// exceptions that %E#S is interpreted as %E*S, and %E#f as %E*f. %Ez
+// and %E*z also accept the same inputs, which (along with %z) includes
+// 'z' and 'Z' as synonyms for +00:00. %ET accepts either 'T' or 't'.
+//
+// %Y consumes as many numeric characters as it can, so the matching data
+// should always be terminated with a non-numeric. %E4Y always consumes
+// exactly four characters, including any sign.
+//
+// Unspecified fields are taken from the default date and time of ...
+//
+// "1970-01-01 00:00:00.0 +0000"
+//
+// For example, parsing a string of "15:45" (%H:%M) will return a time_point
+// that represents "1970-01-01 15:45:00.0 +0000".
+//
+// Note that parse() returns time instants, so it makes most sense to parse
+// fully-specified date/time strings that include a UTC offset (%z, %Ez, or
+// %E*z).
+//
+// Note also that parse() only heeds the fields year, month, day, hour,
+// minute, (fractional) second, and UTC offset. Other fields, like weekday (%a
+// or %A), while parsed for syntactic validity, are ignored in the conversion.
+//
+// Date and time fields that are out-of-range will be treated as errors rather
+// than normalizing them like cctz::civil_second() would do. For example, it
+// is an error to parse the date "Oct 32, 2013" because 32 is out of range.
+//
+// A second of ":60" is normalized to ":00" of the following minute with
+// fractional seconds discarded. The following table shows how the given
+// seconds and subseconds will be parsed:
+//
+// "59.x" -> 59.x // exact
+// "60.x" -> 00.0 // normalized
+// "00.x" -> 00.x // exact
+//
+// Errors are indicated by returning false.
+//
+// Example:
+// const cctz::time_zone tz = ...
+// std::chrono::system_clock::time_point tp;
+// if (cctz::parse("%Y-%m-%d", "2015-10-09", tz, &tp)) {
+// ...
+// }
+template <typename D>
+inline bool parse(const std::string& fmt, const std::string& input,
+ const time_zone& tz, time_point<D>* tpp) {
+ time_point<seconds> sec;
+ detail::femtoseconds fs;
+ const bool b = detail::parse(fmt, input, tz, &sec, &fs);
+ if (b) {
+ // TODO: Return false if unrepresentable as a time_point<D>.
+ *tpp = std::chrono::time_point_cast<D>(sec);
+ *tpp += std::chrono::duration_cast<D>(fs);
+ }
+ return b;
+}
+
+} // namespace cctz
+} // namespace time_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_H_
diff --git a/third_party/abseil/src/absl/time/internal/cctz/include/cctz/zone_info_source.h b/third_party/abseil/src/absl/time/internal/cctz/include/cctz/zone_info_source.h
new file mode 100644
index 0000000..012eb4e
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/include/cctz/zone_info_source.h
@@ -0,0 +1,102 @@
+// Copyright 2016 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_TIME_INTERNAL_CCTZ_ZONE_INFO_SOURCE_H_
+#define ABSL_TIME_INTERNAL_CCTZ_ZONE_INFO_SOURCE_H_
+
+#include <cstddef>
+#include <functional>
+#include <memory>
+#include <string>
+
+#include "absl/base/config.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace time_internal {
+namespace cctz {
+
+// A stdio-like interface for providing zoneinfo data for a particular zone.
+class ZoneInfoSource {
+ public:
+ virtual ~ZoneInfoSource();
+
+ virtual std::size_t Read(void* ptr, std::size_t size) = 0; // like fread()
+ virtual int Skip(std::size_t offset) = 0; // like fseek()
+
+ // Until the zoneinfo data supports versioning information, we provide
+ // a way for a ZoneInfoSource to indicate it out-of-band. The default
+ // implementation returns an empty string.
+ virtual std::string Version() const;
+};
+
+} // namespace cctz
+} // namespace time_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace time_internal {
+namespace cctz_extension {
+
+// A function-pointer type for a factory that returns a ZoneInfoSource
+// given the name of a time zone and a fallback factory. Returns null
+// when the data for the named zone cannot be found.
+using ZoneInfoSourceFactory =
+ std::unique_ptr<absl::time_internal::cctz::ZoneInfoSource> (*)(
+ const std::string&,
+ const std::function<std::unique_ptr<
+ absl::time_internal::cctz::ZoneInfoSource>(const std::string&)>&);
+
+// The user can control the mapping of zone names to zoneinfo data by
+// providing a definition for cctz_extension::zone_info_source_factory.
+// For example, given functions my_factory() and my_other_factory() that
+// can return a ZoneInfoSource for a named zone, we could inject them into
+// cctz::load_time_zone() with:
+//
+// namespace cctz_extension {
+// namespace {
+// std::unique_ptr<cctz::ZoneInfoSource> CustomFactory(
+// const std::string& name,
+// const std::function<std::unique_ptr<cctz::ZoneInfoSource>(
+// const std::string& name)>& fallback_factory) {
+// if (auto zip = my_factory(name)) return zip;
+// if (auto zip = fallback_factory(name)) return zip;
+// if (auto zip = my_other_factory(name)) return zip;
+// return nullptr;
+// }
+// } // namespace
+// ZoneInfoSourceFactory zone_info_source_factory = CustomFactory;
+// } // namespace cctz_extension
+//
+// This might be used, say, to use zoneinfo data embedded in the program,
+// or read from a (possibly compressed) file archive, or both.
+//
+// cctz_extension::zone_info_source_factory() will be called:
+// (1) from the same thread as the cctz::load_time_zone() call,
+// (2) only once for any zone name, and
+// (3) serially (i.e., no concurrent execution).
+//
+// The fallback factory obtains zoneinfo data by reading files in ${TZDIR},
+// and it is used automatically when no zone_info_source_factory definition
+// is linked into the program.
+extern ZoneInfoSourceFactory zone_info_source_factory;
+
+} // namespace cctz_extension
+} // namespace time_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_TIME_INTERNAL_CCTZ_ZONE_INFO_SOURCE_H_
diff --git a/third_party/abseil/src/absl/time/internal/cctz/src/cctz_benchmark.cc b/third_party/abseil/src/absl/time/internal/cctz/src/cctz_benchmark.cc
new file mode 100644
index 0000000..4e39188
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/src/cctz_benchmark.cc
@@ -0,0 +1,1030 @@
+// Copyright 2016 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <algorithm>
+#include <cassert>
+#include <chrono>
+#include <ctime>
+#include <random>
+#include <string>
+#include <vector>
+
+#include "benchmark/benchmark.h"
+#include "absl/time/internal/cctz/include/cctz/civil_time.h"
+#include "absl/time/internal/cctz/include/cctz/time_zone.h"
+#include "time_zone_impl.h"
+
+namespace {
+
+namespace cctz = absl::time_internal::cctz;
+
+void BM_Difference_Days(benchmark::State& state) {
+ const cctz::civil_day c(2014, 8, 22);
+ const cctz::civil_day epoch(1970, 1, 1);
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(c - epoch);
+ }
+}
+BENCHMARK(BM_Difference_Days);
+
+void BM_Step_Days(benchmark::State& state) {
+ const cctz::civil_day kStart(2014, 8, 22);
+ cctz::civil_day c = kStart;
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(++c);
+ }
+}
+BENCHMARK(BM_Step_Days);
+
+void BM_GetWeekday(benchmark::State& state) {
+ const cctz::civil_day c(2014, 8, 22);
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(cctz::get_weekday(c));
+ }
+}
+BENCHMARK(BM_GetWeekday);
+
+void BM_NextWeekday(benchmark::State& state) {
+ const cctz::civil_day kStart(2014, 8, 22);
+ const cctz::civil_day kDays[7] = {
+ kStart + 0, kStart + 1, kStart + 2, kStart + 3,
+ kStart + 4, kStart + 5, kStart + 6,
+ };
+ const cctz::weekday kWeekdays[7] = {
+ cctz::weekday::monday, cctz::weekday::tuesday, cctz::weekday::wednesday,
+ cctz::weekday::thursday, cctz::weekday::friday, cctz::weekday::saturday,
+ cctz::weekday::sunday,
+ };
+ while (state.KeepRunningBatch(7 * 7)) {
+ for (const auto from : kDays) {
+ for (const auto to : kWeekdays) {
+ benchmark::DoNotOptimize(cctz::next_weekday(from, to));
+ }
+ }
+ }
+}
+BENCHMARK(BM_NextWeekday);
+
+void BM_PrevWeekday(benchmark::State& state) {
+ const cctz::civil_day kStart(2014, 8, 22);
+ const cctz::civil_day kDays[7] = {
+ kStart + 0, kStart + 1, kStart + 2, kStart + 3,
+ kStart + 4, kStart + 5, kStart + 6,
+ };
+ const cctz::weekday kWeekdays[7] = {
+ cctz::weekday::monday, cctz::weekday::tuesday, cctz::weekday::wednesday,
+ cctz::weekday::thursday, cctz::weekday::friday, cctz::weekday::saturday,
+ cctz::weekday::sunday,
+ };
+ while (state.KeepRunningBatch(7 * 7)) {
+ for (const auto from : kDays) {
+ for (const auto to : kWeekdays) {
+ benchmark::DoNotOptimize(cctz::prev_weekday(from, to));
+ }
+ }
+ }
+}
+BENCHMARK(BM_PrevWeekday);
+
+const char RFC3339_full[] = "%Y-%m-%d%ET%H:%M:%E*S%Ez";
+const char RFC3339_sec[] = "%Y-%m-%d%ET%H:%M:%S%Ez";
+
+const char RFC1123_full[] = "%a, %d %b %Y %H:%M:%S %z";
+const char RFC1123_no_wday[] = "%d %b %Y %H:%M:%S %z";
+
+// A list of known time-zone names.
+// TODO: Refactor with src/time_zone_lookup_test.cc.
+const char* const kTimeZoneNames[] = {"Africa/Abidjan",
+ "Africa/Accra",
+ "Africa/Addis_Ababa",
+ "Africa/Algiers",
+ "Africa/Asmara",
+ "Africa/Asmera",
+ "Africa/Bamako",
+ "Africa/Bangui",
+ "Africa/Banjul",
+ "Africa/Bissau",
+ "Africa/Blantyre",
+ "Africa/Brazzaville",
+ "Africa/Bujumbura",
+ "Africa/Cairo",
+ "Africa/Casablanca",
+ "Africa/Ceuta",
+ "Africa/Conakry",
+ "Africa/Dakar",
+ "Africa/Dar_es_Salaam",
+ "Africa/Djibouti",
+ "Africa/Douala",
+ "Africa/El_Aaiun",
+ "Africa/Freetown",
+ "Africa/Gaborone",
+ "Africa/Harare",
+ "Africa/Johannesburg",
+ "Africa/Juba",
+ "Africa/Kampala",
+ "Africa/Khartoum",
+ "Africa/Kigali",
+ "Africa/Kinshasa",
+ "Africa/Lagos",
+ "Africa/Libreville",
+ "Africa/Lome",
+ "Africa/Luanda",
+ "Africa/Lubumbashi",
+ "Africa/Lusaka",
+ "Africa/Malabo",
+ "Africa/Maputo",
+ "Africa/Maseru",
+ "Africa/Mbabane",
+ "Africa/Mogadishu",
+ "Africa/Monrovia",
+ "Africa/Nairobi",
+ "Africa/Ndjamena",
+ "Africa/Niamey",
+ "Africa/Nouakchott",
+ "Africa/Ouagadougou",
+ "Africa/Porto-Novo",
+ "Africa/Sao_Tome",
+ "Africa/Timbuktu",
+ "Africa/Tripoli",
+ "Africa/Tunis",
+ "Africa/Windhoek",
+ "America/Adak",
+ "America/Anchorage",
+ "America/Anguilla",
+ "America/Antigua",
+ "America/Araguaina",
+ "America/Argentina/Buenos_Aires",
+ "America/Argentina/Catamarca",
+ "America/Argentina/ComodRivadavia",
+ "America/Argentina/Cordoba",
+ "America/Argentina/Jujuy",
+ "America/Argentina/La_Rioja",
+ "America/Argentina/Mendoza",
+ "America/Argentina/Rio_Gallegos",
+ "America/Argentina/Salta",
+ "America/Argentina/San_Juan",
+ "America/Argentina/San_Luis",
+ "America/Argentina/Tucuman",
+ "America/Argentina/Ushuaia",
+ "America/Aruba",
+ "America/Asuncion",
+ "America/Atikokan",
+ "America/Atka",
+ "America/Bahia",
+ "America/Bahia_Banderas",
+ "America/Barbados",
+ "America/Belem",
+ "America/Belize",
+ "America/Blanc-Sablon",
+ "America/Boa_Vista",
+ "America/Bogota",
+ "America/Boise",
+ "America/Buenos_Aires",
+ "America/Cambridge_Bay",
+ "America/Campo_Grande",
+ "America/Cancun",
+ "America/Caracas",
+ "America/Catamarca",
+ "America/Cayenne",
+ "America/Cayman",
+ "America/Chicago",
+ "America/Chihuahua",
+ "America/Coral_Harbour",
+ "America/Cordoba",
+ "America/Costa_Rica",
+ "America/Creston",
+ "America/Cuiaba",
+ "America/Curacao",
+ "America/Danmarkshavn",
+ "America/Dawson",
+ "America/Dawson_Creek",
+ "America/Denver",
+ "America/Detroit",
+ "America/Dominica",
+ "America/Edmonton",
+ "America/Eirunepe",
+ "America/El_Salvador",
+ "America/Ensenada",
+ "America/Fort_Nelson",
+ "America/Fort_Wayne",
+ "America/Fortaleza",
+ "America/Glace_Bay",
+ "America/Godthab",
+ "America/Goose_Bay",
+ "America/Grand_Turk",
+ "America/Grenada",
+ "America/Guadeloupe",
+ "America/Guatemala",
+ "America/Guayaquil",
+ "America/Guyana",
+ "America/Halifax",
+ "America/Havana",
+ "America/Hermosillo",
+ "America/Indiana/Indianapolis",
+ "America/Indiana/Knox",
+ "America/Indiana/Marengo",
+ "America/Indiana/Petersburg",
+ "America/Indiana/Tell_City",
+ "America/Indiana/Vevay",
+ "America/Indiana/Vincennes",
+ "America/Indiana/Winamac",
+ "America/Indianapolis",
+ "America/Inuvik",
+ "America/Iqaluit",
+ "America/Jamaica",
+ "America/Jujuy",
+ "America/Juneau",
+ "America/Kentucky/Louisville",
+ "America/Kentucky/Monticello",
+ "America/Knox_IN",
+ "America/Kralendijk",
+ "America/La_Paz",
+ "America/Lima",
+ "America/Los_Angeles",
+ "America/Louisville",
+ "America/Lower_Princes",
+ "America/Maceio",
+ "America/Managua",
+ "America/Manaus",
+ "America/Marigot",
+ "America/Martinique",
+ "America/Matamoros",
+ "America/Mazatlan",
+ "America/Mendoza",
+ "America/Menominee",
+ "America/Merida",
+ "America/Metlakatla",
+ "America/Mexico_City",
+ "America/Miquelon",
+ "America/Moncton",
+ "America/Monterrey",
+ "America/Montevideo",
+ "America/Montreal",
+ "America/Montserrat",
+ "America/Nassau",
+ "America/New_York",
+ "America/Nipigon",
+ "America/Nome",
+ "America/Noronha",
+ "America/North_Dakota/Beulah",
+ "America/North_Dakota/Center",
+ "America/North_Dakota/New_Salem",
+ "America/Nuuk",
+ "America/Ojinaga",
+ "America/Panama",
+ "America/Pangnirtung",
+ "America/Paramaribo",
+ "America/Phoenix",
+ "America/Port-au-Prince",
+ "America/Port_of_Spain",
+ "America/Porto_Acre",
+ "America/Porto_Velho",
+ "America/Puerto_Rico",
+ "America/Punta_Arenas",
+ "America/Rainy_River",
+ "America/Rankin_Inlet",
+ "America/Recife",
+ "America/Regina",
+ "America/Resolute",
+ "America/Rio_Branco",
+ "America/Rosario",
+ "America/Santa_Isabel",
+ "America/Santarem",
+ "America/Santiago",
+ "America/Santo_Domingo",
+ "America/Sao_Paulo",
+ "America/Scoresbysund",
+ "America/Shiprock",
+ "America/Sitka",
+ "America/St_Barthelemy",
+ "America/St_Johns",
+ "America/St_Kitts",
+ "America/St_Lucia",
+ "America/St_Thomas",
+ "America/St_Vincent",
+ "America/Swift_Current",
+ "America/Tegucigalpa",
+ "America/Thule",
+ "America/Thunder_Bay",
+ "America/Tijuana",
+ "America/Toronto",
+ "America/Tortola",
+ "America/Vancouver",
+ "America/Virgin",
+ "America/Whitehorse",
+ "America/Winnipeg",
+ "America/Yakutat",
+ "America/Yellowknife",
+ "Antarctica/Casey",
+ "Antarctica/Davis",
+ "Antarctica/DumontDUrville",
+ "Antarctica/Macquarie",
+ "Antarctica/Mawson",
+ "Antarctica/McMurdo",
+ "Antarctica/Palmer",
+ "Antarctica/Rothera",
+ "Antarctica/South_Pole",
+ "Antarctica/Syowa",
+ "Antarctica/Troll",
+ "Antarctica/Vostok",
+ "Arctic/Longyearbyen",
+ "Asia/Aden",
+ "Asia/Almaty",
+ "Asia/Amman",
+ "Asia/Anadyr",
+ "Asia/Aqtau",
+ "Asia/Aqtobe",
+ "Asia/Ashgabat",
+ "Asia/Ashkhabad",
+ "Asia/Atyrau",
+ "Asia/Baghdad",
+ "Asia/Bahrain",
+ "Asia/Baku",
+ "Asia/Bangkok",
+ "Asia/Barnaul",
+ "Asia/Beirut",
+ "Asia/Bishkek",
+ "Asia/Brunei",
+ "Asia/Calcutta",
+ "Asia/Chita",
+ "Asia/Choibalsan",
+ "Asia/Chongqing",
+ "Asia/Chungking",
+ "Asia/Colombo",
+ "Asia/Dacca",
+ "Asia/Damascus",
+ "Asia/Dhaka",
+ "Asia/Dili",
+ "Asia/Dubai",
+ "Asia/Dushanbe",
+ "Asia/Famagusta",
+ "Asia/Gaza",
+ "Asia/Harbin",
+ "Asia/Hebron",
+ "Asia/Ho_Chi_Minh",
+ "Asia/Hong_Kong",
+ "Asia/Hovd",
+ "Asia/Irkutsk",
+ "Asia/Istanbul",
+ "Asia/Jakarta",
+ "Asia/Jayapura",
+ "Asia/Jerusalem",
+ "Asia/Kabul",
+ "Asia/Kamchatka",
+ "Asia/Karachi",
+ "Asia/Kashgar",
+ "Asia/Kathmandu",
+ "Asia/Katmandu",
+ "Asia/Khandyga",
+ "Asia/Kolkata",
+ "Asia/Krasnoyarsk",
+ "Asia/Kuala_Lumpur",
+ "Asia/Kuching",
+ "Asia/Kuwait",
+ "Asia/Macao",
+ "Asia/Macau",
+ "Asia/Magadan",
+ "Asia/Makassar",
+ "Asia/Manila",
+ "Asia/Muscat",
+ "Asia/Nicosia",
+ "Asia/Novokuznetsk",
+ "Asia/Novosibirsk",
+ "Asia/Omsk",
+ "Asia/Oral",
+ "Asia/Phnom_Penh",
+ "Asia/Pontianak",
+ "Asia/Pyongyang",
+ "Asia/Qatar",
+ "Asia/Qostanay",
+ "Asia/Qyzylorda",
+ "Asia/Rangoon",
+ "Asia/Riyadh",
+ "Asia/Saigon",
+ "Asia/Sakhalin",
+ "Asia/Samarkand",
+ "Asia/Seoul",
+ "Asia/Shanghai",
+ "Asia/Singapore",
+ "Asia/Srednekolymsk",
+ "Asia/Taipei",
+ "Asia/Tashkent",
+ "Asia/Tbilisi",
+ "Asia/Tehran",
+ "Asia/Tel_Aviv",
+ "Asia/Thimbu",
+ "Asia/Thimphu",
+ "Asia/Tokyo",
+ "Asia/Tomsk",
+ "Asia/Ujung_Pandang",
+ "Asia/Ulaanbaatar",
+ "Asia/Ulan_Bator",
+ "Asia/Urumqi",
+ "Asia/Ust-Nera",
+ "Asia/Vientiane",
+ "Asia/Vladivostok",
+ "Asia/Yakutsk",
+ "Asia/Yangon",
+ "Asia/Yekaterinburg",
+ "Asia/Yerevan",
+ "Atlantic/Azores",
+ "Atlantic/Bermuda",
+ "Atlantic/Canary",
+ "Atlantic/Cape_Verde",
+ "Atlantic/Faeroe",
+ "Atlantic/Faroe",
+ "Atlantic/Jan_Mayen",
+ "Atlantic/Madeira",
+ "Atlantic/Reykjavik",
+ "Atlantic/South_Georgia",
+ "Atlantic/St_Helena",
+ "Atlantic/Stanley",
+ "Australia/ACT",
+ "Australia/Adelaide",
+ "Australia/Brisbane",
+ "Australia/Broken_Hill",
+ "Australia/Canberra",
+ "Australia/Currie",
+ "Australia/Darwin",
+ "Australia/Eucla",
+ "Australia/Hobart",
+ "Australia/LHI",
+ "Australia/Lindeman",
+ "Australia/Lord_Howe",
+ "Australia/Melbourne",
+ "Australia/NSW",
+ "Australia/North",
+ "Australia/Perth",
+ "Australia/Queensland",
+ "Australia/South",
+ "Australia/Sydney",
+ "Australia/Tasmania",
+ "Australia/Victoria",
+ "Australia/West",
+ "Australia/Yancowinna",
+ "Brazil/Acre",
+ "Brazil/DeNoronha",
+ "Brazil/East",
+ "Brazil/West",
+ "CET",
+ "CST6CDT",
+ "Canada/Atlantic",
+ "Canada/Central",
+ "Canada/Eastern",
+ "Canada/Mountain",
+ "Canada/Newfoundland",
+ "Canada/Pacific",
+ "Canada/Saskatchewan",
+ "Canada/Yukon",
+ "Chile/Continental",
+ "Chile/EasterIsland",
+ "Cuba",
+ "EET",
+ "EST",
+ "EST5EDT",
+ "Egypt",
+ "Eire",
+ "Etc/GMT",
+ "Etc/GMT+0",
+ "Etc/GMT+1",
+ "Etc/GMT+10",
+ "Etc/GMT+11",
+ "Etc/GMT+12",
+ "Etc/GMT+2",
+ "Etc/GMT+3",
+ "Etc/GMT+4",
+ "Etc/GMT+5",
+ "Etc/GMT+6",
+ "Etc/GMT+7",
+ "Etc/GMT+8",
+ "Etc/GMT+9",
+ "Etc/GMT-0",
+ "Etc/GMT-1",
+ "Etc/GMT-10",
+ "Etc/GMT-11",
+ "Etc/GMT-12",
+ "Etc/GMT-13",
+ "Etc/GMT-14",
+ "Etc/GMT-2",
+ "Etc/GMT-3",
+ "Etc/GMT-4",
+ "Etc/GMT-5",
+ "Etc/GMT-6",
+ "Etc/GMT-7",
+ "Etc/GMT-8",
+ "Etc/GMT-9",
+ "Etc/GMT0",
+ "Etc/Greenwich",
+ "Etc/UCT",
+ "Etc/UTC",
+ "Etc/Universal",
+ "Etc/Zulu",
+ "Europe/Amsterdam",
+ "Europe/Andorra",
+ "Europe/Astrakhan",
+ "Europe/Athens",
+ "Europe/Belfast",
+ "Europe/Belgrade",
+ "Europe/Berlin",
+ "Europe/Bratislava",
+ "Europe/Brussels",
+ "Europe/Bucharest",
+ "Europe/Budapest",
+ "Europe/Busingen",
+ "Europe/Chisinau",
+ "Europe/Copenhagen",
+ "Europe/Dublin",
+ "Europe/Gibraltar",
+ "Europe/Guernsey",
+ "Europe/Helsinki",
+ "Europe/Isle_of_Man",
+ "Europe/Istanbul",
+ "Europe/Jersey",
+ "Europe/Kaliningrad",
+ "Europe/Kiev",
+ "Europe/Kirov",
+ "Europe/Lisbon",
+ "Europe/Ljubljana",
+ "Europe/London",
+ "Europe/Luxembourg",
+ "Europe/Madrid",
+ "Europe/Malta",
+ "Europe/Mariehamn",
+ "Europe/Minsk",
+ "Europe/Monaco",
+ "Europe/Moscow",
+ "Europe/Nicosia",
+ "Europe/Oslo",
+ "Europe/Paris",
+ "Europe/Podgorica",
+ "Europe/Prague",
+ "Europe/Riga",
+ "Europe/Rome",
+ "Europe/Samara",
+ "Europe/San_Marino",
+ "Europe/Sarajevo",
+ "Europe/Saratov",
+ "Europe/Simferopol",
+ "Europe/Skopje",
+ "Europe/Sofia",
+ "Europe/Stockholm",
+ "Europe/Tallinn",
+ "Europe/Tirane",
+ "Europe/Tiraspol",
+ "Europe/Ulyanovsk",
+ "Europe/Uzhgorod",
+ "Europe/Vaduz",
+ "Europe/Vatican",
+ "Europe/Vienna",
+ "Europe/Vilnius",
+ "Europe/Volgograd",
+ "Europe/Warsaw",
+ "Europe/Zagreb",
+ "Europe/Zaporozhye",
+ "Europe/Zurich",
+ "GB",
+ "GB-Eire",
+ "GMT",
+ "GMT+0",
+ "GMT-0",
+ "GMT0",
+ "Greenwich",
+ "HST",
+ "Hongkong",
+ "Iceland",
+ "Indian/Antananarivo",
+ "Indian/Chagos",
+ "Indian/Christmas",
+ "Indian/Cocos",
+ "Indian/Comoro",
+ "Indian/Kerguelen",
+ "Indian/Mahe",
+ "Indian/Maldives",
+ "Indian/Mauritius",
+ "Indian/Mayotte",
+ "Indian/Reunion",
+ "Iran",
+ "Israel",
+ "Jamaica",
+ "Japan",
+ "Kwajalein",
+ "Libya",
+ "MET",
+ "MST",
+ "MST7MDT",
+ "Mexico/BajaNorte",
+ "Mexico/BajaSur",
+ "Mexico/General",
+ "NZ",
+ "NZ-CHAT",
+ "Navajo",
+ "PRC",
+ "PST8PDT",
+ "Pacific/Apia",
+ "Pacific/Auckland",
+ "Pacific/Bougainville",
+ "Pacific/Chatham",
+ "Pacific/Chuuk",
+ "Pacific/Easter",
+ "Pacific/Efate",
+ "Pacific/Enderbury",
+ "Pacific/Fakaofo",
+ "Pacific/Fiji",
+ "Pacific/Funafuti",
+ "Pacific/Galapagos",
+ "Pacific/Gambier",
+ "Pacific/Guadalcanal",
+ "Pacific/Guam",
+ "Pacific/Honolulu",
+ "Pacific/Johnston",
+ "Pacific/Kiritimati",
+ "Pacific/Kosrae",
+ "Pacific/Kwajalein",
+ "Pacific/Majuro",
+ "Pacific/Marquesas",
+ "Pacific/Midway",
+ "Pacific/Nauru",
+ "Pacific/Niue",
+ "Pacific/Norfolk",
+ "Pacific/Noumea",
+ "Pacific/Pago_Pago",
+ "Pacific/Palau",
+ "Pacific/Pitcairn",
+ "Pacific/Pohnpei",
+ "Pacific/Ponape",
+ "Pacific/Port_Moresby",
+ "Pacific/Rarotonga",
+ "Pacific/Saipan",
+ "Pacific/Samoa",
+ "Pacific/Tahiti",
+ "Pacific/Tarawa",
+ "Pacific/Tongatapu",
+ "Pacific/Truk",
+ "Pacific/Wake",
+ "Pacific/Wallis",
+ "Pacific/Yap",
+ "Poland",
+ "Portugal",
+ "ROC",
+ "ROK",
+ "Singapore",
+ "Turkey",
+ "UCT",
+ "US/Alaska",
+ "US/Aleutian",
+ "US/Arizona",
+ "US/Central",
+ "US/East-Indiana",
+ "US/Eastern",
+ "US/Hawaii",
+ "US/Indiana-Starke",
+ "US/Michigan",
+ "US/Mountain",
+ "US/Pacific",
+ "US/Samoa",
+ "UTC",
+ "Universal",
+ "W-SU",
+ "WET",
+ "Zulu",
+ nullptr};
+
+std::vector<std::string> AllTimeZoneNames() {
+ std::vector<std::string> names;
+ for (const char* const* namep = kTimeZoneNames; *namep != nullptr; ++namep) {
+ names.push_back(std::string("file:") + *namep);
+ }
+ assert(!names.empty());
+
+ std::mt19937 urbg(42); // a UniformRandomBitGenerator with fixed seed
+ std::shuffle(names.begin(), names.end(), urbg);
+ return names;
+}
+
+cctz::time_zone TestTimeZone() {
+ cctz::time_zone tz;
+ cctz::load_time_zone("America/Los_Angeles", &tz);
+ return tz;
+}
+
+void BM_Zone_LoadUTCTimeZoneFirst(benchmark::State& state) {
+ cctz::time_zone tz;
+ cctz::load_time_zone("UTC", &tz); // in case we're first
+ cctz::time_zone::Impl::ClearTimeZoneMapTestOnly();
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(cctz::load_time_zone("UTC", &tz));
+ }
+}
+BENCHMARK(BM_Zone_LoadUTCTimeZoneFirst);
+
+void BM_Zone_LoadUTCTimeZoneLast(benchmark::State& state) {
+ cctz::time_zone tz;
+ for (const auto& name : AllTimeZoneNames()) {
+ cctz::load_time_zone(name, &tz); // prime cache
+ }
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(cctz::load_time_zone("UTC", &tz));
+ }
+}
+BENCHMARK(BM_Zone_LoadUTCTimeZoneLast);
+
+void BM_Zone_LoadTimeZoneFirst(benchmark::State& state) {
+ cctz::time_zone tz = cctz::utc_time_zone(); // in case we're first
+ const std::string name = "file:America/Los_Angeles";
+ while (state.KeepRunning()) {
+ state.PauseTiming();
+ cctz::time_zone::Impl::ClearTimeZoneMapTestOnly();
+ state.ResumeTiming();
+ benchmark::DoNotOptimize(cctz::load_time_zone(name, &tz));
+ }
+}
+BENCHMARK(BM_Zone_LoadTimeZoneFirst);
+
+void BM_Zone_LoadTimeZoneCached(benchmark::State& state) {
+ cctz::time_zone tz = cctz::utc_time_zone(); // in case we're first
+ cctz::time_zone::Impl::ClearTimeZoneMapTestOnly();
+ const std::string name = "file:America/Los_Angeles";
+ cctz::load_time_zone(name, &tz); // prime cache
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(cctz::load_time_zone(name, &tz));
+ }
+}
+BENCHMARK(BM_Zone_LoadTimeZoneCached);
+
+void BM_Zone_LoadLocalTimeZoneCached(benchmark::State& state) {
+ cctz::utc_time_zone(); // in case we're first
+ cctz::time_zone::Impl::ClearTimeZoneMapTestOnly();
+ cctz::local_time_zone(); // prime cache
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(cctz::local_time_zone());
+ }
+}
+BENCHMARK(BM_Zone_LoadLocalTimeZoneCached);
+
+void BM_Zone_LoadAllTimeZonesFirst(benchmark::State& state) {
+ cctz::time_zone tz;
+ const std::vector<std::string> names = AllTimeZoneNames();
+ for (auto index = names.size(); state.KeepRunning(); ++index) {
+ if (index == names.size()) {
+ index = 0;
+ }
+ if (index == 0) {
+ state.PauseTiming();
+ cctz::time_zone::Impl::ClearTimeZoneMapTestOnly();
+ state.ResumeTiming();
+ }
+ benchmark::DoNotOptimize(cctz::load_time_zone(names[index], &tz));
+ }
+}
+BENCHMARK(BM_Zone_LoadAllTimeZonesFirst);
+
+void BM_Zone_LoadAllTimeZonesCached(benchmark::State& state) {
+ cctz::time_zone tz;
+ const std::vector<std::string> names = AllTimeZoneNames();
+ for (const auto& name : names) {
+ cctz::load_time_zone(name, &tz); // prime cache
+ }
+ for (auto index = names.size(); state.KeepRunning(); ++index) {
+ if (index == names.size()) {
+ index = 0;
+ }
+ benchmark::DoNotOptimize(cctz::load_time_zone(names[index], &tz));
+ }
+}
+BENCHMARK(BM_Zone_LoadAllTimeZonesCached);
+
+void BM_Zone_TimeZoneEqualityImplicit(benchmark::State& state) {
+ cctz::time_zone tz; // implicit UTC
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(tz == tz);
+ }
+}
+BENCHMARK(BM_Zone_TimeZoneEqualityImplicit);
+
+void BM_Zone_TimeZoneEqualityExplicit(benchmark::State& state) {
+ cctz::time_zone tz = cctz::utc_time_zone(); // explicit UTC
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(tz == tz);
+ }
+}
+BENCHMARK(BM_Zone_TimeZoneEqualityExplicit);
+
+void BM_Zone_UTCTimeZone(benchmark::State& state) {
+ cctz::time_zone tz;
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(cctz::utc_time_zone());
+ }
+}
+BENCHMARK(BM_Zone_UTCTimeZone);
+
+// In each "ToCivil" benchmark we switch between two instants separated
+// by at least one transition in order to defeat any internal caching of
+// previous results (e.g., see local_time_hint_).
+//
+// The "UTC" variants use UTC instead of the Google/local time zone.
+
+void BM_Time_ToCivil_CCTZ(benchmark::State& state) {
+ const cctz::time_zone tz = TestTimeZone();
+ std::chrono::system_clock::time_point tp =
+ std::chrono::system_clock::from_time_t(1384569027);
+ std::chrono::system_clock::time_point tp2 =
+ std::chrono::system_clock::from_time_t(1418962578);
+ while (state.KeepRunning()) {
+ std::swap(tp, tp2);
+ tp += std::chrono::seconds(1);
+ benchmark::DoNotOptimize(cctz::convert(tp, tz));
+ }
+}
+BENCHMARK(BM_Time_ToCivil_CCTZ);
+
+void BM_Time_ToCivil_Libc(benchmark::State& state) {
+ // No timezone support, so just use localtime.
+ time_t t = 1384569027;
+ time_t t2 = 1418962578;
+ struct tm tm;
+ while (state.KeepRunning()) {
+ std::swap(t, t2);
+ t += 1;
+#if defined(_WIN32) || defined(_WIN64)
+ benchmark::DoNotOptimize(localtime_s(&tm, &t));
+#else
+ benchmark::DoNotOptimize(localtime_r(&t, &tm));
+#endif
+ }
+}
+BENCHMARK(BM_Time_ToCivil_Libc);
+
+void BM_Time_ToCivilUTC_CCTZ(benchmark::State& state) {
+ const cctz::time_zone tz = cctz::utc_time_zone();
+ std::chrono::system_clock::time_point tp =
+ std::chrono::system_clock::from_time_t(1384569027);
+ while (state.KeepRunning()) {
+ tp += std::chrono::seconds(1);
+ benchmark::DoNotOptimize(cctz::convert(tp, tz));
+ }
+}
+BENCHMARK(BM_Time_ToCivilUTC_CCTZ);
+
+void BM_Time_ToCivilUTC_Libc(benchmark::State& state) {
+ time_t t = 1384569027;
+ struct tm tm;
+ while (state.KeepRunning()) {
+ t += 1;
+#if defined(_WIN32) || defined(_WIN64)
+ benchmark::DoNotOptimize(gmtime_s(&tm, &t));
+#else
+ benchmark::DoNotOptimize(gmtime_r(&t, &tm));
+#endif
+ }
+}
+BENCHMARK(BM_Time_ToCivilUTC_Libc);
+
+// In each "FromCivil" benchmark we switch between two YMDhms values
+// separated by at least one transition in order to defeat any internal
+// caching of previous results (e.g., see time_local_hint_).
+//
+// The "UTC" variants use UTC instead of the Google/local time zone.
+// The "Day0" variants require normalization of the day of month.
+
+void BM_Time_FromCivil_CCTZ(benchmark::State& state) {
+ const cctz::time_zone tz = TestTimeZone();
+ int i = 0;
+ while (state.KeepRunning()) {
+ if ((i++ & 1) == 0) {
+ benchmark::DoNotOptimize(
+ cctz::convert(cctz::civil_second(2014, 12, 18, 20, 16, 18), tz));
+ } else {
+ benchmark::DoNotOptimize(
+ cctz::convert(cctz::civil_second(2013, 11, 15, 18, 30, 27), tz));
+ }
+ }
+}
+BENCHMARK(BM_Time_FromCivil_CCTZ);
+
+void BM_Time_FromCivil_Libc(benchmark::State& state) {
+ // No timezone support, so just use localtime.
+ int i = 0;
+ while (state.KeepRunning()) {
+ struct tm tm;
+ if ((i++ & 1) == 0) {
+ tm.tm_year = 2014 - 1900;
+ tm.tm_mon = 12 - 1;
+ tm.tm_mday = 18;
+ tm.tm_hour = 20;
+ tm.tm_min = 16;
+ tm.tm_sec = 18;
+ } else {
+ tm.tm_year = 2013 - 1900;
+ tm.tm_mon = 11 - 1;
+ tm.tm_mday = 15;
+ tm.tm_hour = 18;
+ tm.tm_min = 30;
+ tm.tm_sec = 27;
+ }
+ tm.tm_isdst = -1;
+ benchmark::DoNotOptimize(mktime(&tm));
+ }
+}
+BENCHMARK(BM_Time_FromCivil_Libc);
+
+void BM_Time_FromCivilUTC_CCTZ(benchmark::State& state) {
+ const cctz::time_zone tz = cctz::utc_time_zone();
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(
+ cctz::convert(cctz::civil_second(2014, 12, 18, 20, 16, 18), tz));
+ }
+}
+BENCHMARK(BM_Time_FromCivilUTC_CCTZ);
+
+// There is no BM_Time_FromCivilUTC_Libc.
+
+void BM_Time_FromCivilDay0_CCTZ(benchmark::State& state) {
+ const cctz::time_zone tz = TestTimeZone();
+ int i = 0;
+ while (state.KeepRunning()) {
+ if ((i++ & 1) == 0) {
+ benchmark::DoNotOptimize(
+ cctz::convert(cctz::civil_second(2014, 12, 0, 20, 16, 18), tz));
+ } else {
+ benchmark::DoNotOptimize(
+ cctz::convert(cctz::civil_second(2013, 11, 0, 18, 30, 27), tz));
+ }
+ }
+}
+BENCHMARK(BM_Time_FromCivilDay0_CCTZ);
+
+void BM_Time_FromCivilDay0_Libc(benchmark::State& state) {
+ // No timezone support, so just use localtime.
+ int i = 0;
+ while (state.KeepRunning()) {
+ struct tm tm;
+ if ((i++ & 1) == 0) {
+ tm.tm_year = 2014 - 1900;
+ tm.tm_mon = 12 - 1;
+ tm.tm_mday = 0;
+ tm.tm_hour = 20;
+ tm.tm_min = 16;
+ tm.tm_sec = 18;
+ } else {
+ tm.tm_year = 2013 - 1900;
+ tm.tm_mon = 11 - 1;
+ tm.tm_mday = 0;
+ tm.tm_hour = 18;
+ tm.tm_min = 30;
+ tm.tm_sec = 27;
+ }
+ tm.tm_isdst = -1;
+ benchmark::DoNotOptimize(mktime(&tm));
+ }
+}
+BENCHMARK(BM_Time_FromCivilDay0_Libc);
+
+const char* const kFormats[] = {
+ RFC1123_full, // 0
+ RFC1123_no_wday, // 1
+ RFC3339_full, // 2
+ RFC3339_sec, // 3
+ "%Y-%m-%d%ET%H:%M:%S", // 4
+ "%Y-%m-%d", // 5
+};
+const int kNumFormats = sizeof(kFormats) / sizeof(kFormats[0]);
+
+void BM_Format_FormatTime(benchmark::State& state) {
+ const std::string fmt = kFormats[state.range(0)];
+ state.SetLabel(fmt);
+ const cctz::time_zone tz = TestTimeZone();
+ const std::chrono::system_clock::time_point tp =
+ cctz::convert(cctz::civil_second(1977, 6, 28, 9, 8, 7), tz) +
+ std::chrono::microseconds(1);
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(cctz::format(fmt, tp, tz));
+ }
+}
+BENCHMARK(BM_Format_FormatTime)->DenseRange(0, kNumFormats - 1);
+
+void BM_Format_ParseTime(benchmark::State& state) {
+ const std::string fmt = kFormats[state.range(0)];
+ state.SetLabel(fmt);
+ const cctz::time_zone tz = TestTimeZone();
+ std::chrono::system_clock::time_point tp =
+ cctz::convert(cctz::civil_second(1977, 6, 28, 9, 8, 7), tz) +
+ std::chrono::microseconds(1);
+ const std::string when = cctz::format(fmt, tp, tz);
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(cctz::parse(fmt, when, tz, &tp));
+ }
+}
+BENCHMARK(BM_Format_ParseTime)->DenseRange(0, kNumFormats - 1);
+
+} // namespace
diff --git a/third_party/abseil/src/absl/time/internal/cctz/src/civil_time_detail.cc b/third_party/abseil/src/absl/time/internal/cctz/src/civil_time_detail.cc
new file mode 100644
index 0000000..0b07e39
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/src/civil_time_detail.cc
@@ -0,0 +1,94 @@
+// Copyright 2016 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/time/internal/cctz/include/cctz/civil_time_detail.h"
+
+#include <iomanip>
+#include <ostream>
+#include <sstream>
+
+#include "absl/base/config.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace time_internal {
+namespace cctz {
+namespace detail {
+
+// Output stream operators output a format matching YYYY-MM-DDThh:mm:ss,
+// while omitting fields inferior to the type's alignment. For example,
+// civil_day is formatted only as YYYY-MM-DD.
+std::ostream& operator<<(std::ostream& os, const civil_year& y) {
+ std::stringstream ss;
+ ss << y.year(); // No padding.
+ return os << ss.str();
+}
+std::ostream& operator<<(std::ostream& os, const civil_month& m) {
+ std::stringstream ss;
+ ss << civil_year(m) << '-';
+ ss << std::setfill('0') << std::setw(2) << m.month();
+ return os << ss.str();
+}
+std::ostream& operator<<(std::ostream& os, const civil_day& d) {
+ std::stringstream ss;
+ ss << civil_month(d) << '-';
+ ss << std::setfill('0') << std::setw(2) << d.day();
+ return os << ss.str();
+}
+std::ostream& operator<<(std::ostream& os, const civil_hour& h) {
+ std::stringstream ss;
+ ss << civil_day(h) << 'T';
+ ss << std::setfill('0') << std::setw(2) << h.hour();
+ return os << ss.str();
+}
+std::ostream& operator<<(std::ostream& os, const civil_minute& m) {
+ std::stringstream ss;
+ ss << civil_hour(m) << ':';
+ ss << std::setfill('0') << std::setw(2) << m.minute();
+ return os << ss.str();
+}
+std::ostream& operator<<(std::ostream& os, const civil_second& s) {
+ std::stringstream ss;
+ ss << civil_minute(s) << ':';
+ ss << std::setfill('0') << std::setw(2) << s.second();
+ return os << ss.str();
+}
+
+////////////////////////////////////////////////////////////////////////
+
+std::ostream& operator<<(std::ostream& os, weekday wd) {
+ switch (wd) {
+ case weekday::monday:
+ return os << "Monday";
+ case weekday::tuesday:
+ return os << "Tuesday";
+ case weekday::wednesday:
+ return os << "Wednesday";
+ case weekday::thursday:
+ return os << "Thursday";
+ case weekday::friday:
+ return os << "Friday";
+ case weekday::saturday:
+ return os << "Saturday";
+ case weekday::sunday:
+ return os << "Sunday";
+ }
+ return os; // Should never get here, but -Wreturn-type may warn without this.
+}
+
+} // namespace detail
+} // namespace cctz
+} // namespace time_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/time/internal/cctz/src/civil_time_test.cc b/third_party/abseil/src/absl/time/internal/cctz/src/civil_time_test.cc
new file mode 100644
index 0000000..a5a7123
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/src/civil_time_test.cc
@@ -0,0 +1,1066 @@
+// Copyright 2016 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/time/internal/cctz/include/cctz/civil_time.h"
+
+#include <iomanip>
+#include <limits>
+#include <sstream>
+#include <string>
+#include <type_traits>
+
+#include "gtest/gtest.h"
+#include "absl/base/config.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace time_internal {
+namespace cctz {
+
+namespace {
+
+template <typename T>
+std::string Format(const T& t) {
+ std::stringstream ss;
+ ss << t;
+ return ss.str();
+}
+
+} // namespace
+
+#if __cpp_constexpr >= 201304 || (defined(_MSC_VER) && _MSC_VER >= 1910)
+// Construction constexpr tests
+
+TEST(CivilTime, Normal) {
+ constexpr civil_second css(2016, 1, 28, 17, 14, 12);
+ static_assert(css.second() == 12, "Normal.second");
+ constexpr civil_minute cmm(2016, 1, 28, 17, 14);
+ static_assert(cmm.minute() == 14, "Normal.minute");
+ constexpr civil_hour chh(2016, 1, 28, 17);
+ static_assert(chh.hour() == 17, "Normal.hour");
+ constexpr civil_day cd(2016, 1, 28);
+ static_assert(cd.day() == 28, "Normal.day");
+ constexpr civil_month cm(2016, 1);
+ static_assert(cm.month() == 1, "Normal.month");
+ constexpr civil_year cy(2016);
+ static_assert(cy.year() == 2016, "Normal.year");
+}
+
+TEST(CivilTime, Conversion) {
+ constexpr civil_year cy(2016);
+ static_assert(cy.year() == 2016, "Conversion.year");
+ constexpr civil_month cm(cy);
+ static_assert(cm.month() == 1, "Conversion.month");
+ constexpr civil_day cd(cm);
+ static_assert(cd.day() == 1, "Conversion.day");
+ constexpr civil_hour chh(cd);
+ static_assert(chh.hour() == 0, "Conversion.hour");
+ constexpr civil_minute cmm(chh);
+ static_assert(cmm.minute() == 0, "Conversion.minute");
+ constexpr civil_second css(cmm);
+ static_assert(css.second() == 0, "Conversion.second");
+}
+
+// Normalization constexpr tests
+
+TEST(CivilTime, Normalized) {
+ constexpr civil_second cs(2016, 1, 28, 17, 14, 12);
+ static_assert(cs.year() == 2016, "Normalized.year");
+ static_assert(cs.month() == 1, "Normalized.month");
+ static_assert(cs.day() == 28, "Normalized.day");
+ static_assert(cs.hour() == 17, "Normalized.hour");
+ static_assert(cs.minute() == 14, "Normalized.minute");
+ static_assert(cs.second() == 12, "Normalized.second");
+}
+
+TEST(CivilTime, SecondOverflow) {
+ constexpr civil_second cs(2016, 1, 28, 17, 14, 121);
+ static_assert(cs.year() == 2016, "SecondOverflow.year");
+ static_assert(cs.month() == 1, "SecondOverflow.month");
+ static_assert(cs.day() == 28, "SecondOverflow.day");
+ static_assert(cs.hour() == 17, "SecondOverflow.hour");
+ static_assert(cs.minute() == 16, "SecondOverflow.minute");
+ static_assert(cs.second() == 1, "SecondOverflow.second");
+}
+
+TEST(CivilTime, SecondUnderflow) {
+ constexpr civil_second cs(2016, 1, 28, 17, 14, -121);
+ static_assert(cs.year() == 2016, "SecondUnderflow.year");
+ static_assert(cs.month() == 1, "SecondUnderflow.month");
+ static_assert(cs.day() == 28, "SecondUnderflow.day");
+ static_assert(cs.hour() == 17, "SecondUnderflow.hour");
+ static_assert(cs.minute() == 11, "SecondUnderflow.minute");
+ static_assert(cs.second() == 59, "SecondUnderflow.second");
+}
+
+TEST(CivilTime, MinuteOverflow) {
+ constexpr civil_second cs(2016, 1, 28, 17, 121, 12);
+ static_assert(cs.year() == 2016, "MinuteOverflow.year");
+ static_assert(cs.month() == 1, "MinuteOverflow.month");
+ static_assert(cs.day() == 28, "MinuteOverflow.day");
+ static_assert(cs.hour() == 19, "MinuteOverflow.hour");
+ static_assert(cs.minute() == 1, "MinuteOverflow.minute");
+ static_assert(cs.second() == 12, "MinuteOverflow.second");
+}
+
+TEST(CivilTime, MinuteUnderflow) {
+ constexpr civil_second cs(2016, 1, 28, 17, -121, 12);
+ static_assert(cs.year() == 2016, "MinuteUnderflow.year");
+ static_assert(cs.month() == 1, "MinuteUnderflow.month");
+ static_assert(cs.day() == 28, "MinuteUnderflow.day");
+ static_assert(cs.hour() == 14, "MinuteUnderflow.hour");
+ static_assert(cs.minute() == 59, "MinuteUnderflow.minute");
+ static_assert(cs.second() == 12, "MinuteUnderflow.second");
+}
+
+TEST(CivilTime, HourOverflow) {
+ constexpr civil_second cs(2016, 1, 28, 49, 14, 12);
+ static_assert(cs.year() == 2016, "HourOverflow.year");
+ static_assert(cs.month() == 1, "HourOverflow.month");
+ static_assert(cs.day() == 30, "HourOverflow.day");
+ static_assert(cs.hour() == 1, "HourOverflow.hour");
+ static_assert(cs.minute() == 14, "HourOverflow.minute");
+ static_assert(cs.second() == 12, "HourOverflow.second");
+}
+
+TEST(CivilTime, HourUnderflow) {
+ constexpr civil_second cs(2016, 1, 28, -49, 14, 12);
+ static_assert(cs.year() == 2016, "HourUnderflow.year");
+ static_assert(cs.month() == 1, "HourUnderflow.month");
+ static_assert(cs.day() == 25, "HourUnderflow.day");
+ static_assert(cs.hour() == 23, "HourUnderflow.hour");
+ static_assert(cs.minute() == 14, "HourUnderflow.minute");
+ static_assert(cs.second() == 12, "HourUnderflow.second");
+}
+
+TEST(CivilTime, MonthOverflow) {
+ constexpr civil_second cs(2016, 25, 28, 17, 14, 12);
+ static_assert(cs.year() == 2018, "MonthOverflow.year");
+ static_assert(cs.month() == 1, "MonthOverflow.month");
+ static_assert(cs.day() == 28, "MonthOverflow.day");
+ static_assert(cs.hour() == 17, "MonthOverflow.hour");
+ static_assert(cs.minute() == 14, "MonthOverflow.minute");
+ static_assert(cs.second() == 12, "MonthOverflow.second");
+}
+
+TEST(CivilTime, MonthUnderflow) {
+ constexpr civil_second cs(2016, -25, 28, 17, 14, 12);
+ static_assert(cs.year() == 2013, "MonthUnderflow.year");
+ static_assert(cs.month() == 11, "MonthUnderflow.month");
+ static_assert(cs.day() == 28, "MonthUnderflow.day");
+ static_assert(cs.hour() == 17, "MonthUnderflow.hour");
+ static_assert(cs.minute() == 14, "MonthUnderflow.minute");
+ static_assert(cs.second() == 12, "MonthUnderflow.second");
+}
+
+TEST(CivilTime, C4Overflow) {
+ constexpr civil_second cs(2016, 1, 292195, 17, 14, 12);
+ static_assert(cs.year() == 2816, "C4Overflow.year");
+ static_assert(cs.month() == 1, "C4Overflow.month");
+ static_assert(cs.day() == 1, "C4Overflow.day");
+ static_assert(cs.hour() == 17, "C4Overflow.hour");
+ static_assert(cs.minute() == 14, "C4Overflow.minute");
+ static_assert(cs.second() == 12, "C4Overflow.second");
+}
+
+TEST(CivilTime, C4Underflow) {
+ constexpr civil_second cs(2016, 1, -292195, 17, 14, 12);
+ static_assert(cs.year() == 1215, "C4Underflow.year");
+ static_assert(cs.month() == 12, "C4Underflow.month");
+ static_assert(cs.day() == 30, "C4Underflow.day");
+ static_assert(cs.hour() == 17, "C4Underflow.hour");
+ static_assert(cs.minute() == 14, "C4Underflow.minute");
+ static_assert(cs.second() == 12, "C4Underflow.second");
+}
+
+TEST(CivilTime, MixedNormalization) {
+ constexpr civil_second cs(2016, -42, 122, 99, -147, 4949);
+ static_assert(cs.year() == 2012, "MixedNormalization.year");
+ static_assert(cs.month() == 10, "MixedNormalization.month");
+ static_assert(cs.day() == 4, "MixedNormalization.day");
+ static_assert(cs.hour() == 1, "MixedNormalization.hour");
+ static_assert(cs.minute() == 55, "MixedNormalization.minute");
+ static_assert(cs.second() == 29, "MixedNormalization.second");
+}
+
+// Relational constexpr tests
+
+TEST(CivilTime, Less) {
+ constexpr civil_second cs1(2016, 1, 28, 17, 14, 12);
+ constexpr civil_second cs2(2016, 1, 28, 17, 14, 13);
+ constexpr bool less = cs1 < cs2;
+ static_assert(less, "Less");
+}
+
+// Arithmetic constexpr tests
+
+TEST(CivilTime, Addition) {
+ constexpr civil_second cs1(2016, 1, 28, 17, 14, 12);
+ constexpr civil_second cs2 = cs1 + 50;
+ static_assert(cs2.year() == 2016, "Addition.year");
+ static_assert(cs2.month() == 1, "Addition.month");
+ static_assert(cs2.day() == 28, "Addition.day");
+ static_assert(cs2.hour() == 17, "Addition.hour");
+ static_assert(cs2.minute() == 15, "Addition.minute");
+ static_assert(cs2.second() == 2, "Addition.second");
+}
+
+TEST(CivilTime, Subtraction) {
+ constexpr civil_second cs1(2016, 1, 28, 17, 14, 12);
+ constexpr civil_second cs2 = cs1 - 50;
+ static_assert(cs2.year() == 2016, "Subtraction.year");
+ static_assert(cs2.month() == 1, "Subtraction.month");
+ static_assert(cs2.day() == 28, "Subtraction.day");
+ static_assert(cs2.hour() == 17, "Subtraction.hour");
+ static_assert(cs2.minute() == 13, "Subtraction.minute");
+ static_assert(cs2.second() == 22, "Subtraction.second");
+}
+
+TEST(CivilTime, Difference) {
+ constexpr civil_day cd1(2016, 1, 28);
+ constexpr civil_day cd2(2015, 1, 28);
+ constexpr int diff = cd1 - cd2;
+ static_assert(diff == 365, "Difference");
+}
+
+// NOTE: Run this with --copt=-ftrapv to detect overflow problems.
+TEST(CivilTime, ConstructionWithHugeYear) {
+ constexpr civil_hour h(-9223372036854775807, 1, 1, -1);
+ static_assert(h.year() == -9223372036854775807 - 1,
+ "ConstructionWithHugeYear");
+ static_assert(h.month() == 12, "ConstructionWithHugeYear");
+ static_assert(h.day() == 31, "ConstructionWithHugeYear");
+ static_assert(h.hour() == 23, "ConstructionWithHugeYear");
+}
+
+// NOTE: Run this with --copt=-ftrapv to detect overflow problems.
+TEST(CivilTime, DifferenceWithHugeYear) {
+ {
+ constexpr civil_day d1(9223372036854775807, 1, 1);
+ constexpr civil_day d2(9223372036854775807, 12, 31);
+ static_assert(d2 - d1 == 364, "DifferenceWithHugeYear");
+ }
+ {
+ constexpr civil_day d1(-9223372036854775807 - 1, 1, 1);
+ constexpr civil_day d2(-9223372036854775807 - 1, 12, 31);
+ static_assert(d2 - d1 == 365, "DifferenceWithHugeYear");
+ }
+ {
+ // Check the limits of the return value at the end of the year range.
+ constexpr civil_day d1(9223372036854775807, 1, 1);
+ constexpr civil_day d2(9198119301927009252, 6, 6);
+ static_assert(d1 - d2 == 9223372036854775807, "DifferenceWithHugeYear");
+ static_assert((d2 - 1) - d1 == -9223372036854775807 - 1,
+ "DifferenceWithHugeYear");
+ }
+ {
+ // Check the limits of the return value at the start of the year range.
+ constexpr civil_day d1(-9223372036854775807 - 1, 1, 1);
+ constexpr civil_day d2(-9198119301927009254, 7, 28);
+ static_assert(d2 - d1 == 9223372036854775807, "DifferenceWithHugeYear");
+ static_assert(d1 - (d2 + 1) == -9223372036854775807 - 1,
+ "DifferenceWithHugeYear");
+ }
+ {
+ // Check the limits of the return value from either side of year 0.
+ constexpr civil_day d1(-12626367463883278, 9, 3);
+ constexpr civil_day d2(12626367463883277, 3, 28);
+ static_assert(d2 - d1 == 9223372036854775807, "DifferenceWithHugeYear");
+ static_assert(d1 - (d2 + 1) == -9223372036854775807 - 1,
+ "DifferenceWithHugeYear");
+ }
+}
+
+// NOTE: Run this with --copt=-ftrapv to detect overflow problems.
+TEST(CivilTime, DifferenceNoIntermediateOverflow) {
+ {
+ // The difference up to the minute field would be below the minimum
+ // diff_t, but the 52 extra seconds brings us back to the minimum.
+ constexpr civil_second s1(-292277022657, 1, 27, 8, 29 - 1, 52);
+ constexpr civil_second s2(1970, 1, 1, 0, 0 - 1, 0);
+ static_assert(s1 - s2 == -9223372036854775807 - 1,
+ "DifferenceNoIntermediateOverflow");
+ }
+ {
+ // The difference up to the minute field would be above the maximum
+ // diff_t, but the -53 extra seconds brings us back to the maximum.
+ constexpr civil_second s1(292277026596, 12, 4, 15, 30, 7 - 7);
+ constexpr civil_second s2(1970, 1, 1, 0, 0, 0 - 7);
+ static_assert(s1 - s2 == 9223372036854775807,
+ "DifferenceNoIntermediateOverflow");
+ }
+}
+
+// Helper constexpr tests
+
+TEST(CivilTime, WeekDay) {
+ constexpr civil_day cd(2016, 1, 28);
+ constexpr weekday wd = get_weekday(cd);
+ static_assert(wd == weekday::thursday, "Weekday");
+}
+
+TEST(CivilTime, NextWeekDay) {
+ constexpr civil_day cd(2016, 1, 28);
+ constexpr civil_day next = next_weekday(cd, weekday::thursday);
+ static_assert(next.year() == 2016, "NextWeekDay.year");
+ static_assert(next.month() == 2, "NextWeekDay.month");
+ static_assert(next.day() == 4, "NextWeekDay.day");
+}
+
+TEST(CivilTime, PrevWeekDay) {
+ constexpr civil_day cd(2016, 1, 28);
+ constexpr civil_day prev = prev_weekday(cd, weekday::thursday);
+ static_assert(prev.year() == 2016, "PrevWeekDay.year");
+ static_assert(prev.month() == 1, "PrevWeekDay.month");
+ static_assert(prev.day() == 21, "PrevWeekDay.day");
+}
+
+TEST(CivilTime, YearDay) {
+ constexpr civil_day cd(2016, 1, 28);
+ constexpr int yd = get_yearday(cd);
+ static_assert(yd == 28, "YearDay");
+}
+#endif // __cpp_constexpr >= 201304 || (defined(_MSC_VER) && _MSC_VER >= 1910)
+
+// The remaining tests do not use constexpr.
+
+TEST(CivilTime, DefaultConstruction) {
+ civil_second ss;
+ EXPECT_EQ("1970-01-01T00:00:00", Format(ss));
+
+ civil_minute mm;
+ EXPECT_EQ("1970-01-01T00:00", Format(mm));
+
+ civil_hour hh;
+ EXPECT_EQ("1970-01-01T00", Format(hh));
+
+ civil_day d;
+ EXPECT_EQ("1970-01-01", Format(d));
+
+ civil_month m;
+ EXPECT_EQ("1970-01", Format(m));
+
+ civil_year y;
+ EXPECT_EQ("1970", Format(y));
+}
+
+TEST(CivilTime, StructMember) {
+ struct S {
+ civil_day day;
+ };
+ S s = {};
+ EXPECT_EQ(civil_day{}, s.day);
+}
+
+TEST(CivilTime, FieldsConstruction) {
+ EXPECT_EQ("2015-01-02T03:04:05", Format(civil_second(2015, 1, 2, 3, 4, 5)));
+ EXPECT_EQ("2015-01-02T03:04:00", Format(civil_second(2015, 1, 2, 3, 4)));
+ EXPECT_EQ("2015-01-02T03:00:00", Format(civil_second(2015, 1, 2, 3)));
+ EXPECT_EQ("2015-01-02T00:00:00", Format(civil_second(2015, 1, 2)));
+ EXPECT_EQ("2015-01-01T00:00:00", Format(civil_second(2015, 1)));
+ EXPECT_EQ("2015-01-01T00:00:00", Format(civil_second(2015)));
+
+ EXPECT_EQ("2015-01-02T03:04", Format(civil_minute(2015, 1, 2, 3, 4, 5)));
+ EXPECT_EQ("2015-01-02T03:04", Format(civil_minute(2015, 1, 2, 3, 4)));
+ EXPECT_EQ("2015-01-02T03:00", Format(civil_minute(2015, 1, 2, 3)));
+ EXPECT_EQ("2015-01-02T00:00", Format(civil_minute(2015, 1, 2)));
+ EXPECT_EQ("2015-01-01T00:00", Format(civil_minute(2015, 1)));
+ EXPECT_EQ("2015-01-01T00:00", Format(civil_minute(2015)));
+
+ EXPECT_EQ("2015-01-02T03", Format(civil_hour(2015, 1, 2, 3, 4, 5)));
+ EXPECT_EQ("2015-01-02T03", Format(civil_hour(2015, 1, 2, 3, 4)));
+ EXPECT_EQ("2015-01-02T03", Format(civil_hour(2015, 1, 2, 3)));
+ EXPECT_EQ("2015-01-02T00", Format(civil_hour(2015, 1, 2)));
+ EXPECT_EQ("2015-01-01T00", Format(civil_hour(2015, 1)));
+ EXPECT_EQ("2015-01-01T00", Format(civil_hour(2015)));
+
+ EXPECT_EQ("2015-01-02", Format(civil_day(2015, 1, 2, 3, 4, 5)));
+ EXPECT_EQ("2015-01-02", Format(civil_day(2015, 1, 2, 3, 4)));
+ EXPECT_EQ("2015-01-02", Format(civil_day(2015, 1, 2, 3)));
+ EXPECT_EQ("2015-01-02", Format(civil_day(2015, 1, 2)));
+ EXPECT_EQ("2015-01-01", Format(civil_day(2015, 1)));
+ EXPECT_EQ("2015-01-01", Format(civil_day(2015)));
+
+ EXPECT_EQ("2015-01", Format(civil_month(2015, 1, 2, 3, 4, 5)));
+ EXPECT_EQ("2015-01", Format(civil_month(2015, 1, 2, 3, 4)));
+ EXPECT_EQ("2015-01", Format(civil_month(2015, 1, 2, 3)));
+ EXPECT_EQ("2015-01", Format(civil_month(2015, 1, 2)));
+ EXPECT_EQ("2015-01", Format(civil_month(2015, 1)));
+ EXPECT_EQ("2015-01", Format(civil_month(2015)));
+
+ EXPECT_EQ("2015", Format(civil_year(2015, 1, 2, 3, 4, 5)));
+ EXPECT_EQ("2015", Format(civil_year(2015, 1, 2, 3, 4)));
+ EXPECT_EQ("2015", Format(civil_year(2015, 1, 2, 3)));
+ EXPECT_EQ("2015", Format(civil_year(2015, 1, 2)));
+ EXPECT_EQ("2015", Format(civil_year(2015, 1)));
+ EXPECT_EQ("2015", Format(civil_year(2015)));
+}
+
+TEST(CivilTime, FieldsConstructionLimits) {
+ const int kIntMax = std::numeric_limits<int>::max();
+ EXPECT_EQ("2038-01-19T03:14:07",
+ Format(civil_second(1970, 1, 1, 0, 0, kIntMax)));
+ EXPECT_EQ("6121-02-11T05:21:07",
+ Format(civil_second(1970, 1, 1, 0, kIntMax, kIntMax)));
+ EXPECT_EQ("251104-11-20T12:21:07",
+ Format(civil_second(1970, 1, 1, kIntMax, kIntMax, kIntMax)));
+ EXPECT_EQ("6130715-05-30T12:21:07",
+ Format(civil_second(1970, 1, kIntMax, kIntMax, kIntMax, kIntMax)));
+ EXPECT_EQ(
+ "185087685-11-26T12:21:07",
+ Format(civil_second(1970, kIntMax, kIntMax, kIntMax, kIntMax, kIntMax)));
+
+ const int kIntMin = std::numeric_limits<int>::min();
+ EXPECT_EQ("1901-12-13T20:45:52",
+ Format(civil_second(1970, 1, 1, 0, 0, kIntMin)));
+ EXPECT_EQ("-2182-11-20T18:37:52",
+ Format(civil_second(1970, 1, 1, 0, kIntMin, kIntMin)));
+ EXPECT_EQ("-247165-02-11T10:37:52",
+ Format(civil_second(1970, 1, 1, kIntMin, kIntMin, kIntMin)));
+ EXPECT_EQ("-6126776-08-01T10:37:52",
+ Format(civil_second(1970, 1, kIntMin, kIntMin, kIntMin, kIntMin)));
+ EXPECT_EQ(
+ "-185083747-10-31T10:37:52",
+ Format(civil_second(1970, kIntMin, kIntMin, kIntMin, kIntMin, kIntMin)));
+}
+
+TEST(CivilTime, ImplicitCrossAlignment) {
+ civil_year year(2015);
+ civil_month month = year;
+ civil_day day = month;
+ civil_hour hour = day;
+ civil_minute minute = hour;
+ civil_second second = minute;
+
+ second = year;
+ EXPECT_EQ(second, year);
+ second = month;
+ EXPECT_EQ(second, month);
+ second = day;
+ EXPECT_EQ(second, day);
+ second = hour;
+ EXPECT_EQ(second, hour);
+ second = minute;
+ EXPECT_EQ(second, minute);
+
+ minute = year;
+ EXPECT_EQ(minute, year);
+ minute = month;
+ EXPECT_EQ(minute, month);
+ minute = day;
+ EXPECT_EQ(minute, day);
+ minute = hour;
+ EXPECT_EQ(minute, hour);
+
+ hour = year;
+ EXPECT_EQ(hour, year);
+ hour = month;
+ EXPECT_EQ(hour, month);
+ hour = day;
+ EXPECT_EQ(hour, day);
+
+ day = year;
+ EXPECT_EQ(day, year);
+ day = month;
+ EXPECT_EQ(day, month);
+
+ month = year;
+ EXPECT_EQ(month, year);
+
+ // Ensures unsafe conversions are not allowed.
+ EXPECT_FALSE((std::is_convertible<civil_second, civil_minute>::value));
+ EXPECT_FALSE((std::is_convertible<civil_second, civil_hour>::value));
+ EXPECT_FALSE((std::is_convertible<civil_second, civil_day>::value));
+ EXPECT_FALSE((std::is_convertible<civil_second, civil_month>::value));
+ EXPECT_FALSE((std::is_convertible<civil_second, civil_year>::value));
+
+ EXPECT_FALSE((std::is_convertible<civil_minute, civil_hour>::value));
+ EXPECT_FALSE((std::is_convertible<civil_minute, civil_day>::value));
+ EXPECT_FALSE((std::is_convertible<civil_minute, civil_month>::value));
+ EXPECT_FALSE((std::is_convertible<civil_minute, civil_year>::value));
+
+ EXPECT_FALSE((std::is_convertible<civil_hour, civil_day>::value));
+ EXPECT_FALSE((std::is_convertible<civil_hour, civil_month>::value));
+ EXPECT_FALSE((std::is_convertible<civil_hour, civil_year>::value));
+
+ EXPECT_FALSE((std::is_convertible<civil_day, civil_month>::value));
+ EXPECT_FALSE((std::is_convertible<civil_day, civil_year>::value));
+
+ EXPECT_FALSE((std::is_convertible<civil_month, civil_year>::value));
+}
+
+TEST(CivilTime, ExplicitCrossAlignment) {
+ //
+ // Assign from smaller units -> larger units
+ //
+
+ civil_second second(2015, 1, 2, 3, 4, 5);
+ EXPECT_EQ("2015-01-02T03:04:05", Format(second));
+
+ civil_minute minute(second);
+ EXPECT_EQ("2015-01-02T03:04", Format(minute));
+
+ civil_hour hour(minute);
+ EXPECT_EQ("2015-01-02T03", Format(hour));
+
+ civil_day day(hour);
+ EXPECT_EQ("2015-01-02", Format(day));
+
+ civil_month month(day);
+ EXPECT_EQ("2015-01", Format(month));
+
+ civil_year year(month);
+ EXPECT_EQ("2015", Format(year));
+
+ //
+ // Now assign from larger units -> smaller units
+ //
+
+ month = civil_month(year);
+ EXPECT_EQ("2015-01", Format(month));
+
+ day = civil_day(month);
+ EXPECT_EQ("2015-01-01", Format(day));
+
+ hour = civil_hour(day);
+ EXPECT_EQ("2015-01-01T00", Format(hour));
+
+ minute = civil_minute(hour);
+ EXPECT_EQ("2015-01-01T00:00", Format(minute));
+
+ second = civil_second(minute);
+ EXPECT_EQ("2015-01-01T00:00:00", Format(second));
+}
+
+// Metafunction to test whether difference is allowed between two types.
+template <typename T1, typename T2>
+struct HasDifference {
+ template <typename U1, typename U2>
+ static std::false_type test(...);
+ template <typename U1, typename U2>
+ static std::true_type test(decltype(std::declval<U1>() - std::declval<U2>()));
+ static constexpr bool value = decltype(test<T1, T2>(0))::value;
+};
+
+TEST(CivilTime, DisallowCrossAlignedDifference) {
+ // Difference is allowed between types with the same alignment.
+ static_assert(HasDifference<civil_second, civil_second>::value, "");
+ static_assert(HasDifference<civil_minute, civil_minute>::value, "");
+ static_assert(HasDifference<civil_hour, civil_hour>::value, "");
+ static_assert(HasDifference<civil_day, civil_day>::value, "");
+ static_assert(HasDifference<civil_month, civil_month>::value, "");
+ static_assert(HasDifference<civil_year, civil_year>::value, "");
+
+ // Difference is disallowed between types with different alignments.
+ static_assert(!HasDifference<civil_second, civil_minute>::value, "");
+ static_assert(!HasDifference<civil_second, civil_hour>::value, "");
+ static_assert(!HasDifference<civil_second, civil_day>::value, "");
+ static_assert(!HasDifference<civil_second, civil_month>::value, "");
+ static_assert(!HasDifference<civil_second, civil_year>::value, "");
+
+ static_assert(!HasDifference<civil_minute, civil_hour>::value, "");
+ static_assert(!HasDifference<civil_minute, civil_day>::value, "");
+ static_assert(!HasDifference<civil_minute, civil_month>::value, "");
+ static_assert(!HasDifference<civil_minute, civil_year>::value, "");
+
+ static_assert(!HasDifference<civil_hour, civil_day>::value, "");
+ static_assert(!HasDifference<civil_hour, civil_month>::value, "");
+ static_assert(!HasDifference<civil_hour, civil_year>::value, "");
+
+ static_assert(!HasDifference<civil_day, civil_month>::value, "");
+ static_assert(!HasDifference<civil_day, civil_year>::value, "");
+
+ static_assert(!HasDifference<civil_month, civil_year>::value, "");
+}
+
+TEST(CivilTime, ValueSemantics) {
+ const civil_hour a(2015, 1, 2, 3);
+ const civil_hour b = a;
+ const civil_hour c(b);
+ civil_hour d;
+ d = c;
+ EXPECT_EQ("2015-01-02T03", Format(d));
+}
+
+TEST(CivilTime, Relational) {
+ // Tests that the alignment unit is ignored in comparison.
+ const civil_year year(2014);
+ const civil_month month(year);
+ EXPECT_EQ(year, month);
+
+#define TEST_RELATIONAL(OLDER, YOUNGER) \
+ do { \
+ EXPECT_FALSE(OLDER < OLDER); \
+ EXPECT_FALSE(OLDER > OLDER); \
+ EXPECT_TRUE(OLDER >= OLDER); \
+ EXPECT_TRUE(OLDER <= OLDER); \
+ EXPECT_FALSE(YOUNGER < YOUNGER); \
+ EXPECT_FALSE(YOUNGER > YOUNGER); \
+ EXPECT_TRUE(YOUNGER >= YOUNGER); \
+ EXPECT_TRUE(YOUNGER <= YOUNGER); \
+ EXPECT_EQ(OLDER, OLDER); \
+ EXPECT_NE(OLDER, YOUNGER); \
+ EXPECT_LT(OLDER, YOUNGER); \
+ EXPECT_LE(OLDER, YOUNGER); \
+ EXPECT_GT(YOUNGER, OLDER); \
+ EXPECT_GE(YOUNGER, OLDER); \
+ } while (0)
+
+ // Alignment is ignored in comparison (verified above), so kSecond is used
+ // to test comparison in all field positions.
+ TEST_RELATIONAL(civil_second(2014, 1, 1, 0, 0, 0),
+ civil_second(2015, 1, 1, 0, 0, 0));
+ TEST_RELATIONAL(civil_second(2014, 1, 1, 0, 0, 0),
+ civil_second(2014, 2, 1, 0, 0, 0));
+ TEST_RELATIONAL(civil_second(2014, 1, 1, 0, 0, 0),
+ civil_second(2014, 1, 2, 0, 0, 0));
+ TEST_RELATIONAL(civil_second(2014, 1, 1, 0, 0, 0),
+ civil_second(2014, 1, 1, 1, 0, 0));
+ TEST_RELATIONAL(civil_second(2014, 1, 1, 1, 0, 0),
+ civil_second(2014, 1, 1, 1, 1, 0));
+ TEST_RELATIONAL(civil_second(2014, 1, 1, 1, 1, 0),
+ civil_second(2014, 1, 1, 1, 1, 1));
+
+ // Tests the relational operators of two different civil-time types.
+ TEST_RELATIONAL(civil_day(2014, 1, 1), civil_minute(2014, 1, 1, 1, 1));
+ TEST_RELATIONAL(civil_day(2014, 1, 1), civil_month(2014, 2));
+
+#undef TEST_RELATIONAL
+}
+
+TEST(CivilTime, Arithmetic) {
+ civil_second second(2015, 1, 2, 3, 4, 5);
+ EXPECT_EQ("2015-01-02T03:04:06", Format(second += 1));
+ EXPECT_EQ("2015-01-02T03:04:07", Format(second + 1));
+ EXPECT_EQ("2015-01-02T03:04:08", Format(2 + second));
+ EXPECT_EQ("2015-01-02T03:04:05", Format(second - 1));
+ EXPECT_EQ("2015-01-02T03:04:05", Format(second -= 1));
+ EXPECT_EQ("2015-01-02T03:04:05", Format(second++));
+ EXPECT_EQ("2015-01-02T03:04:07", Format(++second));
+ EXPECT_EQ("2015-01-02T03:04:07", Format(second--));
+ EXPECT_EQ("2015-01-02T03:04:05", Format(--second));
+
+ civil_minute minute(2015, 1, 2, 3, 4);
+ EXPECT_EQ("2015-01-02T03:05", Format(minute += 1));
+ EXPECT_EQ("2015-01-02T03:06", Format(minute + 1));
+ EXPECT_EQ("2015-01-02T03:07", Format(2 + minute));
+ EXPECT_EQ("2015-01-02T03:04", Format(minute - 1));
+ EXPECT_EQ("2015-01-02T03:04", Format(minute -= 1));
+ EXPECT_EQ("2015-01-02T03:04", Format(minute++));
+ EXPECT_EQ("2015-01-02T03:06", Format(++minute));
+ EXPECT_EQ("2015-01-02T03:06", Format(minute--));
+ EXPECT_EQ("2015-01-02T03:04", Format(--minute));
+
+ civil_hour hour(2015, 1, 2, 3);
+ EXPECT_EQ("2015-01-02T04", Format(hour += 1));
+ EXPECT_EQ("2015-01-02T05", Format(hour + 1));
+ EXPECT_EQ("2015-01-02T06", Format(2 + hour));
+ EXPECT_EQ("2015-01-02T03", Format(hour - 1));
+ EXPECT_EQ("2015-01-02T03", Format(hour -= 1));
+ EXPECT_EQ("2015-01-02T03", Format(hour++));
+ EXPECT_EQ("2015-01-02T05", Format(++hour));
+ EXPECT_EQ("2015-01-02T05", Format(hour--));
+ EXPECT_EQ("2015-01-02T03", Format(--hour));
+
+ civil_day day(2015, 1, 2);
+ EXPECT_EQ("2015-01-03", Format(day += 1));
+ EXPECT_EQ("2015-01-04", Format(day + 1));
+ EXPECT_EQ("2015-01-05", Format(2 + day));
+ EXPECT_EQ("2015-01-02", Format(day - 1));
+ EXPECT_EQ("2015-01-02", Format(day -= 1));
+ EXPECT_EQ("2015-01-02", Format(day++));
+ EXPECT_EQ("2015-01-04", Format(++day));
+ EXPECT_EQ("2015-01-04", Format(day--));
+ EXPECT_EQ("2015-01-02", Format(--day));
+
+ civil_month month(2015, 1);
+ EXPECT_EQ("2015-02", Format(month += 1));
+ EXPECT_EQ("2015-03", Format(month + 1));
+ EXPECT_EQ("2015-04", Format(2 + month));
+ EXPECT_EQ("2015-01", Format(month - 1));
+ EXPECT_EQ("2015-01", Format(month -= 1));
+ EXPECT_EQ("2015-01", Format(month++));
+ EXPECT_EQ("2015-03", Format(++month));
+ EXPECT_EQ("2015-03", Format(month--));
+ EXPECT_EQ("2015-01", Format(--month));
+
+ civil_year year(2015);
+ EXPECT_EQ("2016", Format(year += 1));
+ EXPECT_EQ("2017", Format(year + 1));
+ EXPECT_EQ("2018", Format(2 + year));
+ EXPECT_EQ("2015", Format(year - 1));
+ EXPECT_EQ("2015", Format(year -= 1));
+ EXPECT_EQ("2015", Format(year++));
+ EXPECT_EQ("2017", Format(++year));
+ EXPECT_EQ("2017", Format(year--));
+ EXPECT_EQ("2015", Format(--year));
+}
+
+TEST(CivilTime, ArithmeticLimits) {
+ const int kIntMax = std::numeric_limits<int>::max();
+ const int kIntMin = std::numeric_limits<int>::min();
+
+ civil_second second(1970, 1, 1, 0, 0, 0);
+ second += kIntMax;
+ EXPECT_EQ("2038-01-19T03:14:07", Format(second));
+ second -= kIntMax;
+ EXPECT_EQ("1970-01-01T00:00:00", Format(second));
+ second += kIntMin;
+ EXPECT_EQ("1901-12-13T20:45:52", Format(second));
+ second -= kIntMin;
+ EXPECT_EQ("1970-01-01T00:00:00", Format(second));
+
+ civil_minute minute(1970, 1, 1, 0, 0);
+ minute += kIntMax;
+ EXPECT_EQ("6053-01-23T02:07", Format(minute));
+ minute -= kIntMax;
+ EXPECT_EQ("1970-01-01T00:00", Format(minute));
+ minute += kIntMin;
+ EXPECT_EQ("-2114-12-08T21:52", Format(minute));
+ minute -= kIntMin;
+ EXPECT_EQ("1970-01-01T00:00", Format(minute));
+
+ civil_hour hour(1970, 1, 1, 0);
+ hour += kIntMax;
+ EXPECT_EQ("246953-10-09T07", Format(hour));
+ hour -= kIntMax;
+ EXPECT_EQ("1970-01-01T00", Format(hour));
+ hour += kIntMin;
+ EXPECT_EQ("-243014-03-24T16", Format(hour));
+ hour -= kIntMin;
+ EXPECT_EQ("1970-01-01T00", Format(hour));
+
+ civil_day day(1970, 1, 1);
+ day += kIntMax;
+ EXPECT_EQ("5881580-07-11", Format(day));
+ day -= kIntMax;
+ EXPECT_EQ("1970-01-01", Format(day));
+ day += kIntMin;
+ EXPECT_EQ("-5877641-06-23", Format(day));
+ day -= kIntMin;
+ EXPECT_EQ("1970-01-01", Format(day));
+
+ civil_month month(1970, 1);
+ month += kIntMax;
+ EXPECT_EQ("178958940-08", Format(month));
+ month -= kIntMax;
+ EXPECT_EQ("1970-01", Format(month));
+ month += kIntMin;
+ EXPECT_EQ("-178955001-05", Format(month));
+ month -= kIntMin;
+ EXPECT_EQ("1970-01", Format(month));
+
+ civil_year year(0);
+ year += kIntMax;
+ EXPECT_EQ("2147483647", Format(year));
+ year -= kIntMax;
+ EXPECT_EQ("0", Format(year));
+ year += kIntMin;
+ EXPECT_EQ("-2147483648", Format(year));
+ year -= kIntMin;
+ EXPECT_EQ("0", Format(year));
+}
+
+TEST(CivilTime, ArithmeticDifference) {
+ civil_second second(2015, 1, 2, 3, 4, 5);
+ EXPECT_EQ(0, second - second);
+ EXPECT_EQ(10, (second + 10) - second);
+ EXPECT_EQ(-10, (second - 10) - second);
+
+ civil_minute minute(2015, 1, 2, 3, 4);
+ EXPECT_EQ(0, minute - minute);
+ EXPECT_EQ(10, (minute + 10) - minute);
+ EXPECT_EQ(-10, (minute - 10) - minute);
+
+ civil_hour hour(2015, 1, 2, 3);
+ EXPECT_EQ(0, hour - hour);
+ EXPECT_EQ(10, (hour + 10) - hour);
+ EXPECT_EQ(-10, (hour - 10) - hour);
+
+ civil_day day(2015, 1, 2);
+ EXPECT_EQ(0, day - day);
+ EXPECT_EQ(10, (day + 10) - day);
+ EXPECT_EQ(-10, (day - 10) - day);
+
+ civil_month month(2015, 1);
+ EXPECT_EQ(0, month - month);
+ EXPECT_EQ(10, (month + 10) - month);
+ EXPECT_EQ(-10, (month - 10) - month);
+
+ civil_year year(2015);
+ EXPECT_EQ(0, year - year);
+ EXPECT_EQ(10, (year + 10) - year);
+ EXPECT_EQ(-10, (year - 10) - year);
+}
+
+TEST(CivilTime, DifferenceLimits) {
+ const int kIntMax = std::numeric_limits<int>::max();
+ const int kIntMin = std::numeric_limits<int>::min();
+
+ // Check day arithmetic at the end of the year range.
+ const civil_day max_day(kIntMax, 12, 31);
+ EXPECT_EQ(1, max_day - (max_day - 1));
+ EXPECT_EQ(-1, (max_day - 1) - max_day);
+
+ // Check day arithmetic at the end of the year range.
+ const civil_day min_day(kIntMin, 1, 1);
+ EXPECT_EQ(1, (min_day + 1) - min_day);
+ EXPECT_EQ(-1, min_day - (min_day + 1));
+
+ // Check the limits of the return value.
+ const civil_day d1(1970, 1, 1);
+ const civil_day d2(5881580, 7, 11);
+ EXPECT_EQ(kIntMax, d2 - d1);
+ EXPECT_EQ(kIntMin, d1 - (d2 + 1));
+}
+
+TEST(CivilTime, Properties) {
+ civil_second ss(2015, 2, 3, 4, 5, 6);
+ EXPECT_EQ(2015, ss.year());
+ EXPECT_EQ(2, ss.month());
+ EXPECT_EQ(3, ss.day());
+ EXPECT_EQ(4, ss.hour());
+ EXPECT_EQ(5, ss.minute());
+ EXPECT_EQ(6, ss.second());
+ EXPECT_EQ(weekday::tuesday, get_weekday(ss));
+ EXPECT_EQ(34, get_yearday(ss));
+
+ civil_minute mm(2015, 2, 3, 4, 5, 6);
+ EXPECT_EQ(2015, mm.year());
+ EXPECT_EQ(2, mm.month());
+ EXPECT_EQ(3, mm.day());
+ EXPECT_EQ(4, mm.hour());
+ EXPECT_EQ(5, mm.minute());
+ EXPECT_EQ(0, mm.second());
+ EXPECT_EQ(weekday::tuesday, get_weekday(mm));
+ EXPECT_EQ(34, get_yearday(mm));
+
+ civil_hour hh(2015, 2, 3, 4, 5, 6);
+ EXPECT_EQ(2015, hh.year());
+ EXPECT_EQ(2, hh.month());
+ EXPECT_EQ(3, hh.day());
+ EXPECT_EQ(4, hh.hour());
+ EXPECT_EQ(0, hh.minute());
+ EXPECT_EQ(0, hh.second());
+ EXPECT_EQ(weekday::tuesday, get_weekday(hh));
+ EXPECT_EQ(34, get_yearday(hh));
+
+ civil_day d(2015, 2, 3, 4, 5, 6);
+ EXPECT_EQ(2015, d.year());
+ EXPECT_EQ(2, d.month());
+ EXPECT_EQ(3, d.day());
+ EXPECT_EQ(0, d.hour());
+ EXPECT_EQ(0, d.minute());
+ EXPECT_EQ(0, d.second());
+ EXPECT_EQ(weekday::tuesday, get_weekday(d));
+ EXPECT_EQ(34, get_yearday(d));
+
+ civil_month m(2015, 2, 3, 4, 5, 6);
+ EXPECT_EQ(2015, m.year());
+ EXPECT_EQ(2, m.month());
+ EXPECT_EQ(1, m.day());
+ EXPECT_EQ(0, m.hour());
+ EXPECT_EQ(0, m.minute());
+ EXPECT_EQ(0, m.second());
+ EXPECT_EQ(weekday::sunday, get_weekday(m));
+ EXPECT_EQ(32, get_yearday(m));
+
+ civil_year y(2015, 2, 3, 4, 5, 6);
+ EXPECT_EQ(2015, y.year());
+ EXPECT_EQ(1, y.month());
+ EXPECT_EQ(1, y.day());
+ EXPECT_EQ(0, y.hour());
+ EXPECT_EQ(0, y.minute());
+ EXPECT_EQ(0, y.second());
+ EXPECT_EQ(weekday::thursday, get_weekday(y));
+ EXPECT_EQ(1, get_yearday(y));
+}
+
+TEST(CivilTime, OutputStream) {
+ // Tests formatting of civil_year, which does not pad.
+ EXPECT_EQ("2016", Format(civil_year(2016)));
+ EXPECT_EQ("123", Format(civil_year(123)));
+ EXPECT_EQ("0", Format(civil_year(0)));
+ EXPECT_EQ("-1", Format(civil_year(-1)));
+
+ // Tests formatting of sub-year types, which pad to 2 digits
+ EXPECT_EQ("2016-02", Format(civil_month(2016, 2)));
+ EXPECT_EQ("2016-02-03", Format(civil_day(2016, 2, 3)));
+ EXPECT_EQ("2016-02-03T04", Format(civil_hour(2016, 2, 3, 4)));
+ EXPECT_EQ("2016-02-03T04:05", Format(civil_minute(2016, 2, 3, 4, 5)));
+ EXPECT_EQ("2016-02-03T04:05:06", Format(civil_second(2016, 2, 3, 4, 5, 6)));
+
+ // Tests formatting of weekday.
+ EXPECT_EQ("Monday", Format(weekday::monday));
+ EXPECT_EQ("Tuesday", Format(weekday::tuesday));
+ EXPECT_EQ("Wednesday", Format(weekday::wednesday));
+ EXPECT_EQ("Thursday", Format(weekday::thursday));
+ EXPECT_EQ("Friday", Format(weekday::friday));
+ EXPECT_EQ("Saturday", Format(weekday::saturday));
+ EXPECT_EQ("Sunday", Format(weekday::sunday));
+}
+
+TEST(CivilTime, OutputStreamLeftFillWidth) {
+ civil_second cs(2016, 2, 3, 4, 5, 6);
+ {
+ std::stringstream ss;
+ ss << std::left << std::setfill('.');
+ ss << std::setw(3) << 'X';
+ ss << std::setw(21) << civil_year(cs);
+ ss << std::setw(3) << 'X';
+ EXPECT_EQ("X..2016.................X..", ss.str());
+ }
+ {
+ std::stringstream ss;
+ ss << std::left << std::setfill('.');
+ ss << std::setw(3) << 'X';
+ ss << std::setw(21) << civil_month(cs);
+ ss << std::setw(3) << 'X';
+ EXPECT_EQ("X..2016-02..............X..", ss.str());
+ }
+ {
+ std::stringstream ss;
+ ss << std::left << std::setfill('.');
+ ss << std::setw(3) << 'X';
+ ss << std::setw(21) << civil_day(cs);
+ ss << std::setw(3) << 'X';
+ EXPECT_EQ("X..2016-02-03...........X..", ss.str());
+ }
+ {
+ std::stringstream ss;
+ ss << std::left << std::setfill('.');
+ ss << std::setw(3) << 'X';
+ ss << std::setw(21) << civil_hour(cs);
+ ss << std::setw(3) << 'X';
+ EXPECT_EQ("X..2016-02-03T04........X..", ss.str());
+ }
+ {
+ std::stringstream ss;
+ ss << std::left << std::setfill('.');
+ ss << std::setw(3) << 'X';
+ ss << std::setw(21) << civil_minute(cs);
+ ss << std::setw(3) << 'X';
+ EXPECT_EQ("X..2016-02-03T04:05.....X..", ss.str());
+ }
+ {
+ std::stringstream ss;
+ ss << std::left << std::setfill('.');
+ ss << std::setw(3) << 'X';
+ ss << std::setw(21) << civil_second(cs);
+ ss << std::setw(3) << 'X';
+ EXPECT_EQ("X..2016-02-03T04:05:06..X..", ss.str());
+ }
+}
+
+TEST(CivilTime, NextPrevWeekday) {
+ // Jan 1, 1970 was a Thursday.
+ const civil_day thursday(1970, 1, 1);
+ EXPECT_EQ(weekday::thursday, get_weekday(thursday));
+
+ // Thursday -> Thursday
+ civil_day d = next_weekday(thursday, weekday::thursday);
+ EXPECT_EQ(7, d - thursday) << Format(d);
+ EXPECT_EQ(d - 14, prev_weekday(thursday, weekday::thursday));
+
+ // Thursday -> Friday
+ d = next_weekday(thursday, weekday::friday);
+ EXPECT_EQ(1, d - thursday) << Format(d);
+ EXPECT_EQ(d - 7, prev_weekday(thursday, weekday::friday));
+
+ // Thursday -> Saturday
+ d = next_weekday(thursday, weekday::saturday);
+ EXPECT_EQ(2, d - thursday) << Format(d);
+ EXPECT_EQ(d - 7, prev_weekday(thursday, weekday::saturday));
+
+ // Thursday -> Sunday
+ d = next_weekday(thursday, weekday::sunday);
+ EXPECT_EQ(3, d - thursday) << Format(d);
+ EXPECT_EQ(d - 7, prev_weekday(thursday, weekday::sunday));
+
+ // Thursday -> Monday
+ d = next_weekday(thursday, weekday::monday);
+ EXPECT_EQ(4, d - thursday) << Format(d);
+ EXPECT_EQ(d - 7, prev_weekday(thursday, weekday::monday));
+
+ // Thursday -> Tuesday
+ d = next_weekday(thursday, weekday::tuesday);
+ EXPECT_EQ(5, d - thursday) << Format(d);
+ EXPECT_EQ(d - 7, prev_weekday(thursday, weekday::tuesday));
+
+ // Thursday -> Wednesday
+ d = next_weekday(thursday, weekday::wednesday);
+ EXPECT_EQ(6, d - thursday) << Format(d);
+ EXPECT_EQ(d - 7, prev_weekday(thursday, weekday::wednesday));
+}
+
+TEST(CivilTime, NormalizeWithHugeYear) {
+ civil_month c(9223372036854775807, 1);
+ EXPECT_EQ("9223372036854775807-01", Format(c));
+ c = c - 1; // Causes normalization
+ EXPECT_EQ("9223372036854775806-12", Format(c));
+
+ c = civil_month(-9223372036854775807 - 1, 1);
+ EXPECT_EQ("-9223372036854775808-01", Format(c));
+ c = c + 12; // Causes normalization
+ EXPECT_EQ("-9223372036854775807-01", Format(c));
+}
+
+TEST(CivilTime, LeapYears) {
+ // Test data for leap years.
+ const struct {
+ int year;
+ int days;
+ struct {
+ int month;
+ int day;
+ } leap_day; // The date of the day after Feb 28.
+ } kLeapYearTable[]{
+ {1900, 365, {3, 1}}, {1999, 365, {3, 1}},
+ {2000, 366, {2, 29}}, // leap year
+ {2001, 365, {3, 1}}, {2002, 365, {3, 1}},
+ {2003, 365, {3, 1}}, {2004, 366, {2, 29}}, // leap year
+ {2005, 365, {3, 1}}, {2006, 365, {3, 1}},
+ {2007, 365, {3, 1}}, {2008, 366, {2, 29}}, // leap year
+ {2009, 365, {3, 1}}, {2100, 365, {3, 1}},
+ };
+
+ for (const auto& e : kLeapYearTable) {
+ // Tests incrementing through the leap day.
+ const civil_day feb28(e.year, 2, 28);
+ const civil_day next_day = feb28 + 1;
+ EXPECT_EQ(e.leap_day.month, next_day.month());
+ EXPECT_EQ(e.leap_day.day, next_day.day());
+
+ // Tests difference in days of leap years.
+ const civil_year year(feb28);
+ const civil_year next_year = year + 1;
+ EXPECT_EQ(e.days, civil_day(next_year) - civil_day(year));
+ }
+}
+
+TEST(CivilTime, FirstThursdayInMonth) {
+ const civil_day nov1(2014, 11, 1);
+ const civil_day thursday = next_weekday(nov1 - 1, weekday::thursday);
+ EXPECT_EQ("2014-11-06", Format(thursday));
+
+ // Bonus: Date of Thanksgiving in the United States
+ // Rule: Fourth Thursday of November
+ const civil_day thanksgiving = thursday + 7 * 3;
+ EXPECT_EQ("2014-11-27", Format(thanksgiving));
+}
+
+} // namespace cctz
+} // namespace time_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/time/internal/cctz/src/time_zone_fixed.cc b/third_party/abseil/src/absl/time/internal/cctz/src/time_zone_fixed.cc
new file mode 100644
index 0000000..303c024
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/src/time_zone_fixed.cc
@@ -0,0 +1,140 @@
+// Copyright 2016 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "time_zone_fixed.h"
+
+#include <algorithm>
+#include <cassert>
+#include <chrono>
+#include <cstring>
+#include <string>
+
+#include "absl/base/config.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace time_internal {
+namespace cctz {
+
+namespace {
+
+// The prefix used for the internal names of fixed-offset zones.
+const char kFixedZonePrefix[] = "Fixed/UTC";
+
+const char kDigits[] = "0123456789";
+
+char* Format02d(char* p, int v) {
+ *p++ = kDigits[(v / 10) % 10];
+ *p++ = kDigits[v % 10];
+ return p;
+}
+
+int Parse02d(const char* p) {
+ if (const char* ap = std::strchr(kDigits, *p)) {
+ int v = static_cast<int>(ap - kDigits);
+ if (const char* bp = std::strchr(kDigits, *++p)) {
+ return (v * 10) + static_cast<int>(bp - kDigits);
+ }
+ }
+ return -1;
+}
+
+} // namespace
+
+bool FixedOffsetFromName(const std::string& name, seconds* offset) {
+ if (name.compare(0, std::string::npos, "UTC", 3) == 0) {
+ *offset = seconds::zero();
+ return true;
+ }
+
+ const std::size_t prefix_len = sizeof(kFixedZonePrefix) - 1;
+ const char* const ep = kFixedZonePrefix + prefix_len;
+ if (name.size() != prefix_len + 9) // <prefix>+99:99:99
+ return false;
+ if (!std::equal(kFixedZonePrefix, ep, name.begin())) return false;
+ const char* np = name.data() + prefix_len;
+ if (np[0] != '+' && np[0] != '-') return false;
+ if (np[3] != ':' || np[6] != ':') // see note below about large offsets
+ return false;
+
+ int hours = Parse02d(np + 1);
+ if (hours == -1) return false;
+ int mins = Parse02d(np + 4);
+ if (mins == -1) return false;
+ int secs = Parse02d(np + 7);
+ if (secs == -1) return false;
+
+ secs += ((hours * 60) + mins) * 60;
+ if (secs > 24 * 60 * 60) return false; // outside supported offset range
+ *offset = seconds(secs * (np[0] == '-' ? -1 : 1)); // "-" means west
+ return true;
+}
+
+std::string FixedOffsetToName(const seconds& offset) {
+ if (offset == seconds::zero()) return "UTC";
+ if (offset < std::chrono::hours(-24) || offset > std::chrono::hours(24)) {
+ // We don't support fixed-offset zones more than 24 hours
+ // away from UTC to avoid complications in rendering such
+ // offsets and to (somewhat) limit the total number of zones.
+ return "UTC";
+ }
+ int offset_seconds = static_cast<int>(offset.count());
+ const char sign = (offset_seconds < 0 ? '-' : '+');
+ int offset_minutes = offset_seconds / 60;
+ offset_seconds %= 60;
+ if (sign == '-') {
+ if (offset_seconds > 0) {
+ offset_seconds -= 60;
+ offset_minutes += 1;
+ }
+ offset_seconds = -offset_seconds;
+ offset_minutes = -offset_minutes;
+ }
+ int offset_hours = offset_minutes / 60;
+ offset_minutes %= 60;
+ const std::size_t prefix_len = sizeof(kFixedZonePrefix) - 1;
+ char buf[prefix_len + sizeof("-24:00:00")];
+ char* ep = std::copy(kFixedZonePrefix, kFixedZonePrefix + prefix_len, buf);
+ *ep++ = sign;
+ ep = Format02d(ep, offset_hours);
+ *ep++ = ':';
+ ep = Format02d(ep, offset_minutes);
+ *ep++ = ':';
+ ep = Format02d(ep, offset_seconds);
+ *ep++ = '\0';
+ assert(ep == buf + sizeof(buf));
+ return buf;
+}
+
+std::string FixedOffsetToAbbr(const seconds& offset) {
+ std::string abbr = FixedOffsetToName(offset);
+ const std::size_t prefix_len = sizeof(kFixedZonePrefix) - 1;
+ if (abbr.size() == prefix_len + 9) { // <prefix>+99:99:99
+ abbr.erase(0, prefix_len); // +99:99:99
+ abbr.erase(6, 1); // +99:9999
+ abbr.erase(3, 1); // +999999
+ if (abbr[5] == '0' && abbr[6] == '0') { // +999900
+ abbr.erase(5, 2); // +9999
+ if (abbr[3] == '0' && abbr[4] == '0') { // +9900
+ abbr.erase(3, 2); // +99
+ }
+ }
+ }
+ return abbr;
+}
+
+} // namespace cctz
+} // namespace time_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/time/internal/cctz/src/time_zone_fixed.h b/third_party/abseil/src/absl/time/internal/cctz/src/time_zone_fixed.h
new file mode 100644
index 0000000..e74a0bb
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/src/time_zone_fixed.h
@@ -0,0 +1,52 @@
+// Copyright 2016 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_FIXED_H_
+#define ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_FIXED_H_
+
+#include <string>
+
+#include "absl/base/config.h"
+#include "absl/time/internal/cctz/include/cctz/time_zone.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace time_internal {
+namespace cctz {
+
+// Helper functions for dealing with the names and abbreviations
+// of time zones that are a fixed offset (seconds east) from UTC.
+// FixedOffsetFromName() extracts the offset from a valid fixed-offset
+// name, while FixedOffsetToName() and FixedOffsetToAbbr() generate
+// the canonical zone name and abbreviation respectively for the given
+// offset.
+//
+// A fixed-offset name looks like "Fixed/UTC<+-><hours>:<mins>:<secs>".
+// Its abbreviation is of the form "UTC(<+->H?H(MM(SS)?)?)?" where the
+// optional pieces are omitted when their values are zero. (Note that
+// the sign is the opposite of that used in a POSIX TZ specification.)
+//
+// Note: FixedOffsetFromName() fails on syntax errors or when the parsed
+// offset exceeds 24 hours. FixedOffsetToName() and FixedOffsetToAbbr()
+// both produce "UTC" when the argument offset exceeds 24 hours.
+bool FixedOffsetFromName(const std::string& name, seconds* offset);
+std::string FixedOffsetToName(const seconds& offset);
+std::string FixedOffsetToAbbr(const seconds& offset);
+
+} // namespace cctz
+} // namespace time_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_FIXED_H_
diff --git a/third_party/abseil/src/absl/time/internal/cctz/src/time_zone_format.cc b/third_party/abseil/src/absl/time/internal/cctz/src/time_zone_format.cc
new file mode 100644
index 0000000..d8cb047
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/src/time_zone_format.cc
@@ -0,0 +1,1029 @@
+// Copyright 2016 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#if !defined(HAS_STRPTIME)
+#if !defined(_MSC_VER) && !defined(__MINGW32__)
+#define HAS_STRPTIME 1 // assume everyone has strptime() except windows
+#endif
+#endif
+
+#if defined(HAS_STRPTIME) && HAS_STRPTIME
+#if !defined(_XOPEN_SOURCE)
+#define _XOPEN_SOURCE // Definedness suffices for strptime.
+#endif
+#endif
+
+#include "absl/base/config.h"
+#include "absl/time/internal/cctz/include/cctz/time_zone.h"
+
+// Include time.h directly since, by C++ standards, ctime doesn't have to
+// declare strptime.
+#include <time.h>
+
+#include <cctype>
+#include <chrono>
+#include <cstddef>
+#include <cstdint>
+#include <cstring>
+#include <ctime>
+#include <limits>
+#include <string>
+#include <vector>
+#if !HAS_STRPTIME
+#include <iomanip>
+#include <sstream>
+#endif
+
+#include "absl/time/internal/cctz/include/cctz/civil_time.h"
+#include "time_zone_if.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace time_internal {
+namespace cctz {
+namespace detail {
+
+namespace {
+
+#if !HAS_STRPTIME
+// Build a strptime() using C++11's std::get_time().
+char* strptime(const char* s, const char* fmt, std::tm* tm) {
+ std::istringstream input(s);
+ input >> std::get_time(tm, fmt);
+ if (input.fail()) return nullptr;
+ return const_cast<char*>(s) +
+ (input.eof() ? strlen(s) : static_cast<std::size_t>(input.tellg()));
+}
+#endif
+
+// Convert a cctz::weekday to a tm_wday value (0-6, Sunday = 0).
+int ToTmWday(weekday wd) {
+ switch (wd) {
+ case weekday::sunday:
+ return 0;
+ case weekday::monday:
+ return 1;
+ case weekday::tuesday:
+ return 2;
+ case weekday::wednesday:
+ return 3;
+ case weekday::thursday:
+ return 4;
+ case weekday::friday:
+ return 5;
+ case weekday::saturday:
+ return 6;
+ }
+ return 0; /*NOTREACHED*/
+}
+
+// Convert a tm_wday value (0-6, Sunday = 0) to a cctz::weekday.
+weekday FromTmWday(int tm_wday) {
+ switch (tm_wday) {
+ case 0:
+ return weekday::sunday;
+ case 1:
+ return weekday::monday;
+ case 2:
+ return weekday::tuesday;
+ case 3:
+ return weekday::wednesday;
+ case 4:
+ return weekday::thursday;
+ case 5:
+ return weekday::friday;
+ case 6:
+ return weekday::saturday;
+ }
+ return weekday::sunday; /*NOTREACHED*/
+}
+
+std::tm ToTM(const time_zone::absolute_lookup& al) {
+ std::tm tm{};
+ tm.tm_sec = al.cs.second();
+ tm.tm_min = al.cs.minute();
+ tm.tm_hour = al.cs.hour();
+ tm.tm_mday = al.cs.day();
+ tm.tm_mon = al.cs.month() - 1;
+
+ // Saturate tm.tm_year is cases of over/underflow.
+ if (al.cs.year() < std::numeric_limits<int>::min() + 1900) {
+ tm.tm_year = std::numeric_limits<int>::min();
+ } else if (al.cs.year() - 1900 > std::numeric_limits<int>::max()) {
+ tm.tm_year = std::numeric_limits<int>::max();
+ } else {
+ tm.tm_year = static_cast<int>(al.cs.year() - 1900);
+ }
+
+ tm.tm_wday = ToTmWday(get_weekday(al.cs));
+ tm.tm_yday = get_yearday(al.cs) - 1;
+ tm.tm_isdst = al.is_dst ? 1 : 0;
+ return tm;
+}
+
+// Returns the week of the year [0:53] given a civil day and the day on
+// which weeks are defined to start.
+int ToWeek(const civil_day& cd, weekday week_start) {
+ const civil_day d(cd.year() % 400, cd.month(), cd.day());
+ return static_cast<int>((d - prev_weekday(civil_year(d), week_start)) / 7);
+}
+
+const char kDigits[] = "0123456789";
+
+// Formats a 64-bit integer in the given field width. Note that it is up
+// to the caller of Format64() [and Format02d()/FormatOffset()] to ensure
+// that there is sufficient space before ep to hold the conversion.
+char* Format64(char* ep, int width, std::int_fast64_t v) {
+ bool neg = false;
+ if (v < 0) {
+ --width;
+ neg = true;
+ if (v == std::numeric_limits<std::int_fast64_t>::min()) {
+ // Avoid negating minimum value.
+ std::int_fast64_t last_digit = -(v % 10);
+ v /= 10;
+ if (last_digit < 0) {
+ ++v;
+ last_digit += 10;
+ }
+ --width;
+ *--ep = kDigits[last_digit];
+ }
+ v = -v;
+ }
+ do {
+ --width;
+ *--ep = kDigits[v % 10];
+ } while (v /= 10);
+ while (--width >= 0) *--ep = '0'; // zero pad
+ if (neg) *--ep = '-';
+ return ep;
+}
+
+// Formats [0 .. 99] as %02d.
+char* Format02d(char* ep, int v) {
+ *--ep = kDigits[v % 10];
+ *--ep = kDigits[(v / 10) % 10];
+ return ep;
+}
+
+// Formats a UTC offset, like +00:00.
+char* FormatOffset(char* ep, int offset, const char* mode) {
+ // TODO: Follow the RFC3339 "Unknown Local Offset Convention" and
+ // generate a "negative zero" when we're formatting a zero offset
+ // as the result of a failed load_time_zone().
+ char sign = '+';
+ if (offset < 0) {
+ offset = -offset; // bounded by 24h so no overflow
+ sign = '-';
+ }
+ const int seconds = offset % 60;
+ const int minutes = (offset /= 60) % 60;
+ const int hours = offset /= 60;
+ const char sep = mode[0];
+ const bool ext = (sep != '\0' && mode[1] == '*');
+ const bool ccc = (ext && mode[2] == ':');
+ if (ext && (!ccc || seconds != 0)) {
+ ep = Format02d(ep, seconds);
+ *--ep = sep;
+ } else {
+ // If we're not rendering seconds, sub-minute negative offsets
+ // should get a positive sign (e.g., offset=-10s => "+00:00").
+ if (hours == 0 && minutes == 0) sign = '+';
+ }
+ if (!ccc || minutes != 0 || seconds != 0) {
+ ep = Format02d(ep, minutes);
+ if (sep != '\0') *--ep = sep;
+ }
+ ep = Format02d(ep, hours);
+ *--ep = sign;
+ return ep;
+}
+
+// Formats a std::tm using strftime(3).
+void FormatTM(std::string* out, const std::string& fmt, const std::tm& tm) {
+ // strftime(3) returns the number of characters placed in the output
+ // array (which may be 0 characters). It also returns 0 to indicate
+ // an error, like the array wasn't large enough. To accommodate this,
+ // the following code grows the buffer size from 2x the format string
+ // length up to 32x.
+ for (std::size_t i = 2; i != 32; i *= 2) {
+ std::size_t buf_size = fmt.size() * i;
+ std::vector<char> buf(buf_size);
+ if (std::size_t len = strftime(&buf[0], buf_size, fmt.c_str(), &tm)) {
+ out->append(&buf[0], len);
+ return;
+ }
+ }
+}
+
+// Used for %E#S/%E#f specifiers and for data values in parse().
+template <typename T>
+const char* ParseInt(const char* dp, int width, T min, T max, T* vp) {
+ if (dp != nullptr) {
+ const T kmin = std::numeric_limits<T>::min();
+ bool erange = false;
+ bool neg = false;
+ T value = 0;
+ if (*dp == '-') {
+ neg = true;
+ if (width <= 0 || --width != 0) {
+ ++dp;
+ } else {
+ dp = nullptr; // width was 1
+ }
+ }
+ if (const char* const bp = dp) {
+ while (const char* cp = strchr(kDigits, *dp)) {
+ int d = static_cast<int>(cp - kDigits);
+ if (d >= 10) break;
+ if (value < kmin / 10) {
+ erange = true;
+ break;
+ }
+ value *= 10;
+ if (value < kmin + d) {
+ erange = true;
+ break;
+ }
+ value -= d;
+ dp += 1;
+ if (width > 0 && --width == 0) break;
+ }
+ if (dp != bp && !erange && (neg || value != kmin)) {
+ if (!neg || value != 0) {
+ if (!neg) value = -value; // make positive
+ if (min <= value && value <= max) {
+ *vp = value;
+ } else {
+ dp = nullptr;
+ }
+ } else {
+ dp = nullptr;
+ }
+ } else {
+ dp = nullptr;
+ }
+ }
+ }
+ return dp;
+}
+
+// The number of base-10 digits that can be represented by a signed 64-bit
+// integer. That is, 10^kDigits10_64 <= 2^63 - 1 < 10^(kDigits10_64 + 1).
+const int kDigits10_64 = 18;
+
+// 10^n for everything that can be represented by a signed 64-bit integer.
+const std::int_fast64_t kExp10[kDigits10_64 + 1] = {
+ 1,
+ 10,
+ 100,
+ 1000,
+ 10000,
+ 100000,
+ 1000000,
+ 10000000,
+ 100000000,
+ 1000000000,
+ 10000000000,
+ 100000000000,
+ 1000000000000,
+ 10000000000000,
+ 100000000000000,
+ 1000000000000000,
+ 10000000000000000,
+ 100000000000000000,
+ 1000000000000000000,
+};
+
+} // namespace
+
+// Uses strftime(3) to format the given Time. The following extended format
+// specifiers are also supported:
+//
+// - %Ez - RFC3339-compatible numeric UTC offset (+hh:mm or -hh:mm)
+// - %E*z - Full-resolution numeric UTC offset (+hh:mm:ss or -hh:mm:ss)
+// - %E#S - Seconds with # digits of fractional precision
+// - %E*S - Seconds with full fractional precision (a literal '*')
+// - %E4Y - Four-character years (-999 ... -001, 0000, 0001 ... 9999)
+// - %ET - The RFC3339 "date-time" separator "T"
+//
+// The standard specifiers from RFC3339_* (%Y, %m, %d, %H, %M, and %S) are
+// handled internally for performance reasons. strftime(3) is slow due to
+// a POSIX requirement to respect changes to ${TZ}.
+//
+// The TZ/GNU %s extension is handled internally because strftime() has
+// to use mktime() to generate it, and that assumes the local time zone.
+//
+// We also handle the %z and %Z specifiers to accommodate platforms that do
+// not support the tm_gmtoff and tm_zone extensions to std::tm.
+//
+// Requires that zero() <= fs < seconds(1).
+std::string format(const std::string& format, const time_point<seconds>& tp,
+ const detail::femtoseconds& fs, const time_zone& tz) {
+ std::string result;
+ result.reserve(format.size()); // A reasonable guess for the result size.
+ const time_zone::absolute_lookup al = tz.lookup(tp);
+ const std::tm tm = ToTM(al);
+
+ // Scratch buffer for internal conversions.
+ char buf[3 + kDigits10_64]; // enough for longest conversion
+ char* const ep = buf + sizeof(buf);
+ char* bp; // works back from ep
+
+ // Maintain three, disjoint subsequences that span format.
+ // [format.begin() ... pending) : already formatted into result
+ // [pending ... cur) : formatting pending, but no special cases
+ // [cur ... format.end()) : unexamined
+ // Initially, everything is in the unexamined part.
+ const char* pending = format.c_str(); // NUL terminated
+ const char* cur = pending;
+ const char* end = pending + format.length();
+
+ while (cur != end) { // while something is unexamined
+ // Moves cur to the next percent sign.
+ const char* start = cur;
+ while (cur != end && *cur != '%') ++cur;
+
+ // If the new pending text is all ordinary, copy it out.
+ if (cur != start && pending == start) {
+ result.append(pending, static_cast<std::size_t>(cur - pending));
+ pending = start = cur;
+ }
+
+ // Span the sequential percent signs.
+ const char* percent = cur;
+ while (cur != end && *cur == '%') ++cur;
+
+ // If the new pending text is all percents, copy out one
+ // percent for every matched pair, then skip those pairs.
+ if (cur != start && pending == start) {
+ std::size_t escaped = static_cast<std::size_t>(cur - pending) / 2;
+ result.append(pending, escaped);
+ pending += escaped * 2;
+ // Also copy out a single trailing percent.
+ if (pending != cur && cur == end) {
+ result.push_back(*pending++);
+ }
+ }
+
+ // Loop unless we have an unescaped percent.
+ if (cur == end || (cur - percent) % 2 == 0) continue;
+
+ // Simple specifiers that we handle ourselves.
+ if (strchr("YmdeUuWwHMSzZs%", *cur)) {
+ if (cur - 1 != pending) {
+ FormatTM(&result, std::string(pending, cur - 1), tm);
+ }
+ switch (*cur) {
+ case 'Y':
+ // This avoids the tm.tm_year overflow problem for %Y, however
+ // tm.tm_year will still be used by other specifiers like %D.
+ bp = Format64(ep, 0, al.cs.year());
+ result.append(bp, static_cast<std::size_t>(ep - bp));
+ break;
+ case 'm':
+ bp = Format02d(ep, al.cs.month());
+ result.append(bp, static_cast<std::size_t>(ep - bp));
+ break;
+ case 'd':
+ case 'e':
+ bp = Format02d(ep, al.cs.day());
+ if (*cur == 'e' && *bp == '0') *bp = ' '; // for Windows
+ result.append(bp, static_cast<std::size_t>(ep - bp));
+ break;
+ case 'U':
+ bp = Format02d(ep, ToWeek(civil_day(al.cs), weekday::sunday));
+ result.append(bp, static_cast<std::size_t>(ep - bp));
+ break;
+ case 'u':
+ bp = Format64(ep, 0, tm.tm_wday ? tm.tm_wday : 7);
+ result.append(bp, static_cast<std::size_t>(ep - bp));
+ break;
+ case 'W':
+ bp = Format02d(ep, ToWeek(civil_day(al.cs), weekday::monday));
+ result.append(bp, static_cast<std::size_t>(ep - bp));
+ break;
+ case 'w':
+ bp = Format64(ep, 0, tm.tm_wday);
+ result.append(bp, static_cast<std::size_t>(ep - bp));
+ break;
+ case 'H':
+ bp = Format02d(ep, al.cs.hour());
+ result.append(bp, static_cast<std::size_t>(ep - bp));
+ break;
+ case 'M':
+ bp = Format02d(ep, al.cs.minute());
+ result.append(bp, static_cast<std::size_t>(ep - bp));
+ break;
+ case 'S':
+ bp = Format02d(ep, al.cs.second());
+ result.append(bp, static_cast<std::size_t>(ep - bp));
+ break;
+ case 'z':
+ bp = FormatOffset(ep, al.offset, "");
+ result.append(bp, static_cast<std::size_t>(ep - bp));
+ break;
+ case 'Z':
+ result.append(al.abbr);
+ break;
+ case 's':
+ bp = Format64(ep, 0, ToUnixSeconds(tp));
+ result.append(bp, static_cast<std::size_t>(ep - bp));
+ break;
+ case '%':
+ result.push_back('%');
+ break;
+ }
+ pending = ++cur;
+ continue;
+ }
+
+ // More complex specifiers that we handle ourselves.
+ if (*cur == ':' && cur + 1 != end) {
+ if (*(cur + 1) == 'z') {
+ // Formats %:z.
+ if (cur - 1 != pending) {
+ FormatTM(&result, std::string(pending, cur - 1), tm);
+ }
+ bp = FormatOffset(ep, al.offset, ":");
+ result.append(bp, static_cast<std::size_t>(ep - bp));
+ pending = cur += 2;
+ continue;
+ }
+ if (*(cur + 1) == ':' && cur + 2 != end) {
+ if (*(cur + 2) == 'z') {
+ // Formats %::z.
+ if (cur - 1 != pending) {
+ FormatTM(&result, std::string(pending, cur - 1), tm);
+ }
+ bp = FormatOffset(ep, al.offset, ":*");
+ result.append(bp, static_cast<std::size_t>(ep - bp));
+ pending = cur += 3;
+ continue;
+ }
+ if (*(cur + 2) == ':' && cur + 3 != end) {
+ if (*(cur + 3) == 'z') {
+ // Formats %:::z.
+ if (cur - 1 != pending) {
+ FormatTM(&result, std::string(pending, cur - 1), tm);
+ }
+ bp = FormatOffset(ep, al.offset, ":*:");
+ result.append(bp, static_cast<std::size_t>(ep - bp));
+ pending = cur += 4;
+ continue;
+ }
+ }
+ }
+ }
+
+ // Loop if there is no E modifier.
+ if (*cur != 'E' || ++cur == end) continue;
+
+ // Format our extensions.
+ if (*cur == 'T') {
+ // Formats %ET.
+ if (cur - 2 != pending) {
+ FormatTM(&result, std::string(pending, cur - 2), tm);
+ }
+ result.append("T");
+ pending = ++cur;
+ } else if (*cur == 'z') {
+ // Formats %Ez.
+ if (cur - 2 != pending) {
+ FormatTM(&result, std::string(pending, cur - 2), tm);
+ }
+ bp = FormatOffset(ep, al.offset, ":");
+ result.append(bp, static_cast<std::size_t>(ep - bp));
+ pending = ++cur;
+ } else if (*cur == '*' && cur + 1 != end && *(cur + 1) == 'z') {
+ // Formats %E*z.
+ if (cur - 2 != pending) {
+ FormatTM(&result, std::string(pending, cur - 2), tm);
+ }
+ bp = FormatOffset(ep, al.offset, ":*");
+ result.append(bp, static_cast<std::size_t>(ep - bp));
+ pending = cur += 2;
+ } else if (*cur == '*' && cur + 1 != end &&
+ (*(cur + 1) == 'S' || *(cur + 1) == 'f')) {
+ // Formats %E*S or %E*F.
+ if (cur - 2 != pending) {
+ FormatTM(&result, std::string(pending, cur - 2), tm);
+ }
+ char* cp = ep;
+ bp = Format64(cp, 15, fs.count());
+ while (cp != bp && cp[-1] == '0') --cp;
+ switch (*(cur + 1)) {
+ case 'S':
+ if (cp != bp) *--bp = '.';
+ bp = Format02d(bp, al.cs.second());
+ break;
+ case 'f':
+ if (cp == bp) *--bp = '0';
+ break;
+ }
+ result.append(bp, static_cast<std::size_t>(cp - bp));
+ pending = cur += 2;
+ } else if (*cur == '4' && cur + 1 != end && *(cur + 1) == 'Y') {
+ // Formats %E4Y.
+ if (cur - 2 != pending) {
+ FormatTM(&result, std::string(pending, cur - 2), tm);
+ }
+ bp = Format64(ep, 4, al.cs.year());
+ result.append(bp, static_cast<std::size_t>(ep - bp));
+ pending = cur += 2;
+ } else if (std::isdigit(*cur)) {
+ // Possibly found %E#S or %E#f.
+ int n = 0;
+ if (const char* np = ParseInt(cur, 0, 0, 1024, &n)) {
+ if (*np == 'S' || *np == 'f') {
+ // Formats %E#S or %E#f.
+ if (cur - 2 != pending) {
+ FormatTM(&result, std::string(pending, cur - 2), tm);
+ }
+ bp = ep;
+ if (n > 0) {
+ if (n > kDigits10_64) n = kDigits10_64;
+ bp = Format64(bp, n,
+ (n > 15) ? fs.count() * kExp10[n - 15]
+ : fs.count() / kExp10[15 - n]);
+ if (*np == 'S') *--bp = '.';
+ }
+ if (*np == 'S') bp = Format02d(bp, al.cs.second());
+ result.append(bp, static_cast<std::size_t>(ep - bp));
+ pending = cur = ++np;
+ }
+ }
+ }
+ }
+
+ // Formats any remaining data.
+ if (end != pending) {
+ FormatTM(&result, std::string(pending, end), tm);
+ }
+
+ return result;
+}
+
+namespace {
+
+const char* ParseOffset(const char* dp, const char* mode, int* offset) {
+ if (dp != nullptr) {
+ const char first = *dp++;
+ if (first == '+' || first == '-') {
+ char sep = mode[0];
+ int hours = 0;
+ int minutes = 0;
+ int seconds = 0;
+ const char* ap = ParseInt(dp, 2, 0, 23, &hours);
+ if (ap != nullptr && ap - dp == 2) {
+ dp = ap;
+ if (sep != '\0' && *ap == sep) ++ap;
+ const char* bp = ParseInt(ap, 2, 0, 59, &minutes);
+ if (bp != nullptr && bp - ap == 2) {
+ dp = bp;
+ if (sep != '\0' && *bp == sep) ++bp;
+ const char* cp = ParseInt(bp, 2, 0, 59, &seconds);
+ if (cp != nullptr && cp - bp == 2) dp = cp;
+ }
+ *offset = ((hours * 60 + minutes) * 60) + seconds;
+ if (first == '-') *offset = -*offset;
+ } else {
+ dp = nullptr;
+ }
+ } else if (first == 'Z' || first == 'z') { // Zulu
+ *offset = 0;
+ } else {
+ dp = nullptr;
+ }
+ }
+ return dp;
+}
+
+const char* ParseZone(const char* dp, std::string* zone) {
+ zone->clear();
+ if (dp != nullptr) {
+ while (*dp != '\0' && !std::isspace(*dp)) zone->push_back(*dp++);
+ if (zone->empty()) dp = nullptr;
+ }
+ return dp;
+}
+
+const char* ParseSubSeconds(const char* dp, detail::femtoseconds* subseconds) {
+ if (dp != nullptr) {
+ std::int_fast64_t v = 0;
+ std::int_fast64_t exp = 0;
+ const char* const bp = dp;
+ while (const char* cp = strchr(kDigits, *dp)) {
+ int d = static_cast<int>(cp - kDigits);
+ if (d >= 10) break;
+ if (exp < 15) {
+ exp += 1;
+ v *= 10;
+ v += d;
+ }
+ ++dp;
+ }
+ if (dp != bp) {
+ v *= kExp10[15 - exp];
+ *subseconds = detail::femtoseconds(v);
+ } else {
+ dp = nullptr;
+ }
+ }
+ return dp;
+}
+
+// Parses a string into a std::tm using strptime(3).
+const char* ParseTM(const char* dp, const char* fmt, std::tm* tm) {
+ if (dp != nullptr) {
+ dp = strptime(dp, fmt, tm);
+ }
+ return dp;
+}
+
+// Sets year, tm_mon and tm_mday given the year, week_num, and tm_wday,
+// and the day on which weeks are defined to start. Returns false if year
+// would need to move outside its bounds.
+bool FromWeek(int week_num, weekday week_start, year_t* year, std::tm* tm) {
+ const civil_year y(*year % 400);
+ civil_day cd = prev_weekday(y, week_start); // week 0
+ cd = next_weekday(cd - 1, FromTmWday(tm->tm_wday)) + (week_num * 7);
+ if (const year_t shift = cd.year() - y.year()) {
+ if (shift > 0) {
+ if (*year > std::numeric_limits<year_t>::max() - shift) return false;
+ } else {
+ if (*year < std::numeric_limits<year_t>::min() - shift) return false;
+ }
+ *year += shift;
+ }
+ tm->tm_mon = cd.month() - 1;
+ tm->tm_mday = cd.day();
+ return true;
+}
+
+} // namespace
+
+// Uses strptime(3) to parse the given input. Supports the same extended
+// format specifiers as format(), although %E#S and %E*S are treated
+// identically (and similarly for %E#f and %E*f). %Ez and %E*z also accept
+// the same inputs. %ET accepts either 'T' or 't'.
+//
+// The standard specifiers from RFC3339_* (%Y, %m, %d, %H, %M, and %S) are
+// handled internally so that we can normally avoid strptime() altogether
+// (which is particularly helpful when the native implementation is broken).
+//
+// The TZ/GNU %s extension is handled internally because strptime() has to
+// use localtime_r() to generate it, and that assumes the local time zone.
+//
+// We also handle the %z specifier to accommodate platforms that do not
+// support the tm_gmtoff extension to std::tm. %Z is parsed but ignored.
+bool parse(const std::string& format, const std::string& input,
+ const time_zone& tz, time_point<seconds>* sec,
+ detail::femtoseconds* fs, std::string* err) {
+ // The unparsed input.
+ const char* data = input.c_str(); // NUL terminated
+
+ // Skips leading whitespace.
+ while (std::isspace(*data)) ++data;
+
+ const year_t kyearmax = std::numeric_limits<year_t>::max();
+ const year_t kyearmin = std::numeric_limits<year_t>::min();
+
+ // Sets default values for unspecified fields.
+ bool saw_year = false;
+ year_t year = 1970;
+ std::tm tm{};
+ tm.tm_year = 1970 - 1900;
+ tm.tm_mon = 1 - 1; // Jan
+ tm.tm_mday = 1;
+ tm.tm_hour = 0;
+ tm.tm_min = 0;
+ tm.tm_sec = 0;
+ tm.tm_wday = 4; // Thu
+ tm.tm_yday = 0;
+ tm.tm_isdst = 0;
+ auto subseconds = detail::femtoseconds::zero();
+ bool saw_offset = false;
+ int offset = 0; // No offset from passed tz.
+ std::string zone = "UTC";
+
+ const char* fmt = format.c_str(); // NUL terminated
+ bool twelve_hour = false;
+ bool afternoon = false;
+ int week_num = -1;
+ weekday week_start = weekday::sunday;
+
+ bool saw_percent_s = false;
+ std::int_fast64_t percent_s = 0;
+
+ // Steps through format, one specifier at a time.
+ while (data != nullptr && *fmt != '\0') {
+ if (std::isspace(*fmt)) {
+ while (std::isspace(*data)) ++data;
+ while (std::isspace(*++fmt)) continue;
+ continue;
+ }
+
+ if (*fmt != '%') {
+ if (*data == *fmt) {
+ ++data;
+ ++fmt;
+ } else {
+ data = nullptr;
+ }
+ continue;
+ }
+
+ const char* percent = fmt;
+ if (*++fmt == '\0') {
+ data = nullptr;
+ continue;
+ }
+ switch (*fmt++) {
+ case 'Y':
+ // Symmetrically with FormatTime(), directly handing %Y avoids the
+ // tm.tm_year overflow problem. However, tm.tm_year will still be
+ // used by other specifiers like %D.
+ data = ParseInt(data, 0, kyearmin, kyearmax, &year);
+ if (data != nullptr) saw_year = true;
+ continue;
+ case 'm':
+ data = ParseInt(data, 2, 1, 12, &tm.tm_mon);
+ if (data != nullptr) tm.tm_mon -= 1;
+ week_num = -1;
+ continue;
+ case 'd':
+ case 'e':
+ data = ParseInt(data, 2, 1, 31, &tm.tm_mday);
+ week_num = -1;
+ continue;
+ case 'U':
+ data = ParseInt(data, 0, 0, 53, &week_num);
+ week_start = weekday::sunday;
+ continue;
+ case 'W':
+ data = ParseInt(data, 0, 0, 53, &week_num);
+ week_start = weekday::monday;
+ continue;
+ case 'u':
+ data = ParseInt(data, 0, 1, 7, &tm.tm_wday);
+ if (data != nullptr) tm.tm_wday %= 7;
+ continue;
+ case 'w':
+ data = ParseInt(data, 0, 0, 6, &tm.tm_wday);
+ continue;
+ case 'H':
+ data = ParseInt(data, 2, 0, 23, &tm.tm_hour);
+ twelve_hour = false;
+ continue;
+ case 'M':
+ data = ParseInt(data, 2, 0, 59, &tm.tm_min);
+ continue;
+ case 'S':
+ data = ParseInt(data, 2, 0, 60, &tm.tm_sec);
+ continue;
+ case 'I':
+ case 'l':
+ case 'r': // probably uses %I
+ twelve_hour = true;
+ break;
+ case 'R': // uses %H
+ case 'T': // uses %H
+ case 'c': // probably uses %H
+ case 'X': // probably uses %H
+ twelve_hour = false;
+ break;
+ case 'z':
+ data = ParseOffset(data, "", &offset);
+ if (data != nullptr) saw_offset = true;
+ continue;
+ case 'Z': // ignored; zone abbreviations are ambiguous
+ data = ParseZone(data, &zone);
+ continue;
+ case 's':
+ data =
+ ParseInt(data, 0, std::numeric_limits<std::int_fast64_t>::min(),
+ std::numeric_limits<std::int_fast64_t>::max(), &percent_s);
+ if (data != nullptr) saw_percent_s = true;
+ continue;
+ case ':':
+ if (fmt[0] == 'z' ||
+ (fmt[0] == ':' &&
+ (fmt[1] == 'z' || (fmt[1] == ':' && fmt[2] == 'z')))) {
+ data = ParseOffset(data, ":", &offset);
+ if (data != nullptr) saw_offset = true;
+ fmt += (fmt[0] == 'z') ? 1 : (fmt[1] == 'z') ? 2 : 3;
+ continue;
+ }
+ break;
+ case '%':
+ data = (*data == '%' ? data + 1 : nullptr);
+ continue;
+ case 'E':
+ if (fmt[0] == 'T') {
+ if (*data == 'T' || *data == 't') {
+ ++data;
+ ++fmt;
+ } else {
+ data = nullptr;
+ }
+ continue;
+ }
+ if (fmt[0] == 'z' || (fmt[0] == '*' && fmt[1] == 'z')) {
+ data = ParseOffset(data, ":", &offset);
+ if (data != nullptr) saw_offset = true;
+ fmt += (fmt[0] == 'z') ? 1 : 2;
+ continue;
+ }
+ if (fmt[0] == '*' && fmt[1] == 'S') {
+ data = ParseInt(data, 2, 0, 60, &tm.tm_sec);
+ if (data != nullptr && *data == '.') {
+ data = ParseSubSeconds(data + 1, &subseconds);
+ }
+ fmt += 2;
+ continue;
+ }
+ if (fmt[0] == '*' && fmt[1] == 'f') {
+ if (data != nullptr && std::isdigit(*data)) {
+ data = ParseSubSeconds(data, &subseconds);
+ }
+ fmt += 2;
+ continue;
+ }
+ if (fmt[0] == '4' && fmt[1] == 'Y') {
+ const char* bp = data;
+ data = ParseInt(data, 4, year_t{-999}, year_t{9999}, &year);
+ if (data != nullptr) {
+ if (data - bp == 4) {
+ saw_year = true;
+ } else {
+ data = nullptr; // stopped too soon
+ }
+ }
+ fmt += 2;
+ continue;
+ }
+ if (std::isdigit(*fmt)) {
+ int n = 0; // value ignored
+ if (const char* np = ParseInt(fmt, 0, 0, 1024, &n)) {
+ if (*np == 'S') {
+ data = ParseInt(data, 2, 0, 60, &tm.tm_sec);
+ if (data != nullptr && *data == '.') {
+ data = ParseSubSeconds(data + 1, &subseconds);
+ }
+ fmt = ++np;
+ continue;
+ }
+ if (*np == 'f') {
+ if (data != nullptr && std::isdigit(*data)) {
+ data = ParseSubSeconds(data, &subseconds);
+ }
+ fmt = ++np;
+ continue;
+ }
+ }
+ }
+ if (*fmt == 'c') twelve_hour = false; // probably uses %H
+ if (*fmt == 'X') twelve_hour = false; // probably uses %H
+ if (*fmt != '\0') ++fmt;
+ break;
+ case 'O':
+ if (*fmt == 'H') twelve_hour = false;
+ if (*fmt == 'I') twelve_hour = true;
+ if (*fmt != '\0') ++fmt;
+ break;
+ }
+
+ // Parses the current specifier.
+ const char* orig_data = data;
+ std::string spec(percent, static_cast<std::size_t>(fmt - percent));
+ data = ParseTM(data, spec.c_str(), &tm);
+
+ // If we successfully parsed %p we need to remember whether the result
+ // was AM or PM so that we can adjust tm_hour before time_zone::lookup().
+ // So reparse the input with a known AM hour, and check if it is shifted
+ // to a PM hour.
+ if (spec == "%p" && data != nullptr) {
+ std::string test_input = "1";
+ test_input.append(orig_data, static_cast<std::size_t>(data - orig_data));
+ const char* test_data = test_input.c_str();
+ std::tm tmp{};
+ ParseTM(test_data, "%I%p", &tmp);
+ afternoon = (tmp.tm_hour == 13);
+ }
+ }
+
+ // Adjust a 12-hour tm_hour value if it should be in the afternoon.
+ if (twelve_hour && afternoon && tm.tm_hour < 12) {
+ tm.tm_hour += 12;
+ }
+
+ if (data == nullptr) {
+ if (err != nullptr) *err = "Failed to parse input";
+ return false;
+ }
+
+ // Skip any remaining whitespace.
+ while (std::isspace(*data)) ++data;
+
+ // parse() must consume the entire input string.
+ if (*data != '\0') {
+ if (err != nullptr) *err = "Illegal trailing data in input string";
+ return false;
+ }
+
+ // If we saw %s then we ignore anything else and return that time.
+ if (saw_percent_s) {
+ *sec = FromUnixSeconds(percent_s);
+ *fs = detail::femtoseconds::zero();
+ return true;
+ }
+
+ // If we saw %z, %Ez, or %E*z then we want to interpret the parsed fields
+ // in UTC and then shift by that offset. Otherwise we want to interpret
+ // the fields directly in the passed time_zone.
+ time_zone ptz = saw_offset ? utc_time_zone() : tz;
+
+ // Allows a leap second of 60 to normalize forward to the following ":00".
+ if (tm.tm_sec == 60) {
+ tm.tm_sec -= 1;
+ offset -= 1;
+ subseconds = detail::femtoseconds::zero();
+ }
+
+ if (!saw_year) {
+ year = year_t{tm.tm_year};
+ if (year > kyearmax - 1900) {
+ // Platform-dependent, maybe unreachable.
+ if (err != nullptr) *err = "Out-of-range year";
+ return false;
+ }
+ year += 1900;
+ }
+
+ // Compute year, tm.tm_mon and tm.tm_mday if we parsed a week number.
+ if (week_num != -1) {
+ if (!FromWeek(week_num, week_start, &year, &tm)) {
+ if (err != nullptr) *err = "Out-of-range field";
+ return false;
+ }
+ }
+
+ const int month = tm.tm_mon + 1;
+ civil_second cs(year, month, tm.tm_mday, tm.tm_hour, tm.tm_min, tm.tm_sec);
+
+ // parse() should not allow normalization. Due to the restricted field
+ // ranges above (see ParseInt()), the only possibility is for days to roll
+ // into months. That is, parsing "Sep 31" should not produce "Oct 1".
+ if (cs.month() != month || cs.day() != tm.tm_mday) {
+ if (err != nullptr) *err = "Out-of-range field";
+ return false;
+ }
+
+ // Accounts for the offset adjustment before converting to absolute time.
+ if ((offset < 0 && cs > civil_second::max() + offset) ||
+ (offset > 0 && cs < civil_second::min() + offset)) {
+ if (err != nullptr) *err = "Out-of-range field";
+ return false;
+ }
+ cs -= offset;
+
+ const auto tp = ptz.lookup(cs).pre;
+ // Checks for overflow/underflow and returns an error as necessary.
+ if (tp == time_point<seconds>::max()) {
+ const auto al = ptz.lookup(time_point<seconds>::max());
+ if (cs > al.cs) {
+ if (err != nullptr) *err = "Out-of-range field";
+ return false;
+ }
+ }
+ if (tp == time_point<seconds>::min()) {
+ const auto al = ptz.lookup(time_point<seconds>::min());
+ if (cs < al.cs) {
+ if (err != nullptr) *err = "Out-of-range field";
+ return false;
+ }
+ }
+
+ *sec = tp;
+ *fs = subseconds;
+ return true;
+}
+
+} // namespace detail
+} // namespace cctz
+} // namespace time_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/time/internal/cctz/src/time_zone_format_test.cc b/third_party/abseil/src/absl/time/internal/cctz/src/time_zone_format_test.cc
new file mode 100644
index 0000000..a11f93e
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/src/time_zone_format_test.cc
@@ -0,0 +1,1603 @@
+// Copyright 2016 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <chrono>
+#include <iomanip>
+#include <sstream>
+#include <string>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/base/config.h"
+#include "absl/time/internal/cctz/include/cctz/civil_time.h"
+#include "absl/time/internal/cctz/include/cctz/time_zone.h"
+
+namespace chrono = std::chrono;
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace time_internal {
+namespace cctz {
+
+namespace {
+
+// This helper is a macro so that failed expectations show up with the
+// correct line numbers.
+#define ExpectTime(tp, tz, y, m, d, hh, mm, ss, off, isdst, zone) \
+ do { \
+ time_zone::absolute_lookup al = tz.lookup(tp); \
+ EXPECT_EQ(y, al.cs.year()); \
+ EXPECT_EQ(m, al.cs.month()); \
+ EXPECT_EQ(d, al.cs.day()); \
+ EXPECT_EQ(hh, al.cs.hour()); \
+ EXPECT_EQ(mm, al.cs.minute()); \
+ EXPECT_EQ(ss, al.cs.second()); \
+ EXPECT_EQ(off, al.offset); \
+ EXPECT_TRUE(isdst == al.is_dst); \
+ EXPECT_STREQ(zone, al.abbr); \
+ } while (0)
+
+const char RFC3339_full[] = "%Y-%m-%d%ET%H:%M:%E*S%Ez";
+const char RFC3339_sec[] = "%Y-%m-%d%ET%H:%M:%S%Ez";
+
+const char RFC1123_full[] = "%a, %d %b %Y %H:%M:%S %z";
+const char RFC1123_no_wday[] = "%d %b %Y %H:%M:%S %z";
+
+// A helper that tests the given format specifier by itself, and with leading
+// and trailing characters. For example: TestFormatSpecifier(tp, "%a", "Thu").
+template <typename D>
+void TestFormatSpecifier(time_point<D> tp, time_zone tz, const std::string& fmt,
+ const std::string& ans) {
+ EXPECT_EQ(ans, format(fmt, tp, tz)) << fmt;
+ EXPECT_EQ("xxx " + ans, format("xxx " + fmt, tp, tz));
+ EXPECT_EQ(ans + " yyy", format(fmt + " yyy", tp, tz));
+ EXPECT_EQ("xxx " + ans + " yyy", format("xxx " + fmt + " yyy", tp, tz));
+}
+
+} // namespace
+
+//
+// Testing format()
+//
+
+TEST(Format, TimePointResolution) {
+ const char kFmt[] = "%H:%M:%E*S";
+ const time_zone utc = utc_time_zone();
+ const time_point<chrono::nanoseconds> t0 =
+ chrono::system_clock::from_time_t(1420167845) +
+ chrono::milliseconds(123) + chrono::microseconds(456) +
+ chrono::nanoseconds(789);
+ EXPECT_EQ(
+ "03:04:05.123456789",
+ format(kFmt, chrono::time_point_cast<chrono::nanoseconds>(t0), utc));
+ EXPECT_EQ(
+ "03:04:05.123456",
+ format(kFmt, chrono::time_point_cast<chrono::microseconds>(t0), utc));
+ EXPECT_EQ(
+ "03:04:05.123",
+ format(kFmt, chrono::time_point_cast<chrono::milliseconds>(t0), utc));
+ EXPECT_EQ("03:04:05",
+ format(kFmt, chrono::time_point_cast<chrono::seconds>(t0), utc));
+ EXPECT_EQ(
+ "03:04:05",
+ format(kFmt,
+ chrono::time_point_cast<absl::time_internal::cctz::seconds>(t0),
+ utc));
+ EXPECT_EQ("03:04:00",
+ format(kFmt, chrono::time_point_cast<chrono::minutes>(t0), utc));
+ EXPECT_EQ("03:00:00",
+ format(kFmt, chrono::time_point_cast<chrono::hours>(t0), utc));
+}
+
+TEST(Format, TimePointExtendedResolution) {
+ const char kFmt[] = "%H:%M:%E*S";
+ const time_zone utc = utc_time_zone();
+ const time_point<absl::time_internal::cctz::seconds> tp =
+ chrono::time_point_cast<absl::time_internal::cctz::seconds>(
+ chrono::system_clock::from_time_t(0)) +
+ chrono::hours(12) + chrono::minutes(34) + chrono::seconds(56);
+
+ EXPECT_EQ(
+ "12:34:56.123456789012345",
+ detail::format(kFmt, tp, detail::femtoseconds(123456789012345), utc));
+ EXPECT_EQ(
+ "12:34:56.012345678901234",
+ detail::format(kFmt, tp, detail::femtoseconds(12345678901234), utc));
+ EXPECT_EQ("12:34:56.001234567890123",
+ detail::format(kFmt, tp, detail::femtoseconds(1234567890123), utc));
+ EXPECT_EQ("12:34:56.000123456789012",
+ detail::format(kFmt, tp, detail::femtoseconds(123456789012), utc));
+
+ EXPECT_EQ("12:34:56.000000000000123",
+ detail::format(kFmt, tp, detail::femtoseconds(123), utc));
+ EXPECT_EQ("12:34:56.000000000000012",
+ detail::format(kFmt, tp, detail::femtoseconds(12), utc));
+ EXPECT_EQ("12:34:56.000000000000001",
+ detail::format(kFmt, tp, detail::femtoseconds(1), utc));
+}
+
+TEST(Format, Basics) {
+ time_zone tz = utc_time_zone();
+ time_point<chrono::nanoseconds> tp = chrono::system_clock::from_time_t(0);
+
+ // Starts with a couple basic edge cases.
+ EXPECT_EQ("", format("", tp, tz));
+ EXPECT_EQ(" ", format(" ", tp, tz));
+ EXPECT_EQ(" ", format(" ", tp, tz));
+ EXPECT_EQ("xxx", format("xxx", tp, tz));
+ std::string big(128, 'x');
+ EXPECT_EQ(big, format(big, tp, tz));
+ // Cause the 1024-byte buffer to grow.
+ std::string bigger(100000, 'x');
+ EXPECT_EQ(bigger, format(bigger, tp, tz));
+
+ tp += chrono::hours(13) + chrono::minutes(4) + chrono::seconds(5);
+ tp += chrono::milliseconds(6) + chrono::microseconds(7) +
+ chrono::nanoseconds(8);
+ EXPECT_EQ("1970-01-01", format("%Y-%m-%d", tp, tz));
+ EXPECT_EQ("13:04:05", format("%H:%M:%S", tp, tz));
+ EXPECT_EQ("13:04:05.006", format("%H:%M:%E3S", tp, tz));
+ EXPECT_EQ("13:04:05.006007", format("%H:%M:%E6S", tp, tz));
+ EXPECT_EQ("13:04:05.006007008", format("%H:%M:%E9S", tp, tz));
+}
+
+TEST(Format, PosixConversions) {
+ const time_zone tz = utc_time_zone();
+ auto tp = chrono::system_clock::from_time_t(0);
+
+ TestFormatSpecifier(tp, tz, "%d", "01");
+ TestFormatSpecifier(tp, tz, "%e", " 1"); // extension but internal support
+ TestFormatSpecifier(tp, tz, "%H", "00");
+ TestFormatSpecifier(tp, tz, "%I", "12");
+ TestFormatSpecifier(tp, tz, "%j", "001");
+ TestFormatSpecifier(tp, tz, "%m", "01");
+ TestFormatSpecifier(tp, tz, "%M", "00");
+ TestFormatSpecifier(tp, tz, "%S", "00");
+ TestFormatSpecifier(tp, tz, "%U", "00");
+#if !defined(__EMSCRIPTEN__)
+ TestFormatSpecifier(tp, tz, "%w", "4"); // 4=Thursday
+#endif
+ TestFormatSpecifier(tp, tz, "%W", "00");
+ TestFormatSpecifier(tp, tz, "%y", "70");
+ TestFormatSpecifier(tp, tz, "%Y", "1970");
+ TestFormatSpecifier(tp, tz, "%z", "+0000");
+ TestFormatSpecifier(tp, tz, "%Z", "UTC");
+ TestFormatSpecifier(tp, tz, "%%", "%");
+
+#if defined(__linux__)
+ // SU/C99/TZ extensions
+ TestFormatSpecifier(tp, tz, "%C", "19");
+ TestFormatSpecifier(tp, tz, "%D", "01/01/70");
+ TestFormatSpecifier(tp, tz, "%F", "1970-01-01");
+ TestFormatSpecifier(tp, tz, "%g", "70");
+ TestFormatSpecifier(tp, tz, "%G", "1970");
+ TestFormatSpecifier(tp, tz, "%k", " 0");
+ TestFormatSpecifier(tp, tz, "%l", "12");
+ TestFormatSpecifier(tp, tz, "%n", "\n");
+ TestFormatSpecifier(tp, tz, "%R", "00:00");
+ TestFormatSpecifier(tp, tz, "%t", "\t");
+ TestFormatSpecifier(tp, tz, "%T", "00:00:00");
+ TestFormatSpecifier(tp, tz, "%u", "4"); // 4=Thursday
+ TestFormatSpecifier(tp, tz, "%V", "01");
+ TestFormatSpecifier(tp, tz, "%s", "0");
+#endif
+}
+
+TEST(Format, LocaleSpecific) {
+ const time_zone tz = utc_time_zone();
+ auto tp = chrono::system_clock::from_time_t(0);
+
+ TestFormatSpecifier(tp, tz, "%a", "Thu");
+ TestFormatSpecifier(tp, tz, "%A", "Thursday");
+ TestFormatSpecifier(tp, tz, "%b", "Jan");
+ TestFormatSpecifier(tp, tz, "%B", "January");
+
+ // %c should at least produce the numeric year and time-of-day.
+ const std::string s = format("%c", tp, utc_time_zone());
+ EXPECT_THAT(s, testing::HasSubstr("1970"));
+ EXPECT_THAT(s, testing::HasSubstr("00:00:00"));
+
+ TestFormatSpecifier(tp, tz, "%p", "AM");
+ TestFormatSpecifier(tp, tz, "%x", "01/01/70");
+ TestFormatSpecifier(tp, tz, "%X", "00:00:00");
+
+#if defined(__linux__)
+ // SU/C99/TZ extensions
+ TestFormatSpecifier(tp, tz, "%h", "Jan"); // Same as %b
+ TestFormatSpecifier(tp, tz, "%P", "am");
+ TestFormatSpecifier(tp, tz, "%r", "12:00:00 AM");
+
+ // Modified conversion specifiers %E_
+ TestFormatSpecifier(tp, tz, "%Ec", "Thu Jan 1 00:00:00 1970");
+ TestFormatSpecifier(tp, tz, "%EC", "19");
+ TestFormatSpecifier(tp, tz, "%Ex", "01/01/70");
+ TestFormatSpecifier(tp, tz, "%EX", "00:00:00");
+ TestFormatSpecifier(tp, tz, "%Ey", "70");
+ TestFormatSpecifier(tp, tz, "%EY", "1970");
+
+ // Modified conversion specifiers %O_
+ TestFormatSpecifier(tp, tz, "%Od", "01");
+ TestFormatSpecifier(tp, tz, "%Oe", " 1");
+ TestFormatSpecifier(tp, tz, "%OH", "00");
+ TestFormatSpecifier(tp, tz, "%OI", "12");
+ TestFormatSpecifier(tp, tz, "%Om", "01");
+ TestFormatSpecifier(tp, tz, "%OM", "00");
+ TestFormatSpecifier(tp, tz, "%OS", "00");
+ TestFormatSpecifier(tp, tz, "%Ou", "4"); // 4=Thursday
+ TestFormatSpecifier(tp, tz, "%OU", "00");
+ TestFormatSpecifier(tp, tz, "%OV", "01");
+ TestFormatSpecifier(tp, tz, "%Ow", "4"); // 4=Thursday
+ TestFormatSpecifier(tp, tz, "%OW", "00");
+ TestFormatSpecifier(tp, tz, "%Oy", "70");
+#endif
+}
+
+TEST(Format, Escaping) {
+ const time_zone tz = utc_time_zone();
+ auto tp = chrono::system_clock::from_time_t(0);
+
+ TestFormatSpecifier(tp, tz, "%%", "%");
+ TestFormatSpecifier(tp, tz, "%%a", "%a");
+ TestFormatSpecifier(tp, tz, "%%b", "%b");
+ TestFormatSpecifier(tp, tz, "%%Ea", "%Ea");
+ TestFormatSpecifier(tp, tz, "%%Es", "%Es");
+ TestFormatSpecifier(tp, tz, "%%E3S", "%E3S");
+ TestFormatSpecifier(tp, tz, "%%OS", "%OS");
+ TestFormatSpecifier(tp, tz, "%%O3S", "%O3S");
+
+ // Multiple levels of escaping.
+ TestFormatSpecifier(tp, tz, "%%%Y", "%1970");
+ TestFormatSpecifier(tp, tz, "%%%E3S", "%00.000");
+ TestFormatSpecifier(tp, tz, "%%%%E3S", "%%E3S");
+}
+
+TEST(Format, ExtendedSeconds) {
+ const time_zone tz = utc_time_zone();
+
+ // No subseconds.
+ time_point<chrono::nanoseconds> tp = chrono::system_clock::from_time_t(0);
+ tp += chrono::seconds(5);
+ EXPECT_EQ("05", format("%E*S", tp, tz));
+ EXPECT_EQ("05", format("%E0S", tp, tz));
+ EXPECT_EQ("05.0", format("%E1S", tp, tz));
+ EXPECT_EQ("05.00", format("%E2S", tp, tz));
+ EXPECT_EQ("05.000", format("%E3S", tp, tz));
+ EXPECT_EQ("05.0000", format("%E4S", tp, tz));
+ EXPECT_EQ("05.00000", format("%E5S", tp, tz));
+ EXPECT_EQ("05.000000", format("%E6S", tp, tz));
+ EXPECT_EQ("05.0000000", format("%E7S", tp, tz));
+ EXPECT_EQ("05.00000000", format("%E8S", tp, tz));
+ EXPECT_EQ("05.000000000", format("%E9S", tp, tz));
+ EXPECT_EQ("05.0000000000", format("%E10S", tp, tz));
+ EXPECT_EQ("05.00000000000", format("%E11S", tp, tz));
+ EXPECT_EQ("05.000000000000", format("%E12S", tp, tz));
+ EXPECT_EQ("05.0000000000000", format("%E13S", tp, tz));
+ EXPECT_EQ("05.00000000000000", format("%E14S", tp, tz));
+ EXPECT_EQ("05.000000000000000", format("%E15S", tp, tz));
+
+ // With subseconds.
+ tp += chrono::milliseconds(6) + chrono::microseconds(7) +
+ chrono::nanoseconds(8);
+ EXPECT_EQ("05.006007008", format("%E*S", tp, tz));
+ EXPECT_EQ("05", format("%E0S", tp, tz));
+ EXPECT_EQ("05.0", format("%E1S", tp, tz));
+ EXPECT_EQ("05.00", format("%E2S", tp, tz));
+ EXPECT_EQ("05.006", format("%E3S", tp, tz));
+ EXPECT_EQ("05.0060", format("%E4S", tp, tz));
+ EXPECT_EQ("05.00600", format("%E5S", tp, tz));
+ EXPECT_EQ("05.006007", format("%E6S", tp, tz));
+ EXPECT_EQ("05.0060070", format("%E7S", tp, tz));
+ EXPECT_EQ("05.00600700", format("%E8S", tp, tz));
+ EXPECT_EQ("05.006007008", format("%E9S", tp, tz));
+ EXPECT_EQ("05.0060070080", format("%E10S", tp, tz));
+ EXPECT_EQ("05.00600700800", format("%E11S", tp, tz));
+ EXPECT_EQ("05.006007008000", format("%E12S", tp, tz));
+ EXPECT_EQ("05.0060070080000", format("%E13S", tp, tz));
+ EXPECT_EQ("05.00600700800000", format("%E14S", tp, tz));
+ EXPECT_EQ("05.006007008000000", format("%E15S", tp, tz));
+
+ // Times before the Unix epoch.
+ tp = chrono::system_clock::from_time_t(0) + chrono::microseconds(-1);
+ EXPECT_EQ("1969-12-31 23:59:59.999999",
+ format("%Y-%m-%d %H:%M:%E*S", tp, tz));
+
+ // Here is a "%E*S" case we got wrong for a while. While the first
+ // instant below is correctly rendered as "...:07.333304", the second
+ // one used to appear as "...:07.33330499999999999".
+ tp = chrono::system_clock::from_time_t(0) +
+ chrono::microseconds(1395024427333304);
+ EXPECT_EQ("2014-03-17 02:47:07.333304",
+ format("%Y-%m-%d %H:%M:%E*S", tp, tz));
+ tp += chrono::microseconds(1);
+ EXPECT_EQ("2014-03-17 02:47:07.333305",
+ format("%Y-%m-%d %H:%M:%E*S", tp, tz));
+}
+
+TEST(Format, ExtendedSubeconds) {
+ const time_zone tz = utc_time_zone();
+
+ // No subseconds.
+ time_point<chrono::nanoseconds> tp = chrono::system_clock::from_time_t(0);
+ tp += chrono::seconds(5);
+ EXPECT_EQ("0", format("%E*f", tp, tz));
+ EXPECT_EQ("", format("%E0f", tp, tz));
+ EXPECT_EQ("0", format("%E1f", tp, tz));
+ EXPECT_EQ("00", format("%E2f", tp, tz));
+ EXPECT_EQ("000", format("%E3f", tp, tz));
+ EXPECT_EQ("0000", format("%E4f", tp, tz));
+ EXPECT_EQ("00000", format("%E5f", tp, tz));
+ EXPECT_EQ("000000", format("%E6f", tp, tz));
+ EXPECT_EQ("0000000", format("%E7f", tp, tz));
+ EXPECT_EQ("00000000", format("%E8f", tp, tz));
+ EXPECT_EQ("000000000", format("%E9f", tp, tz));
+ EXPECT_EQ("0000000000", format("%E10f", tp, tz));
+ EXPECT_EQ("00000000000", format("%E11f", tp, tz));
+ EXPECT_EQ("000000000000", format("%E12f", tp, tz));
+ EXPECT_EQ("0000000000000", format("%E13f", tp, tz));
+ EXPECT_EQ("00000000000000", format("%E14f", tp, tz));
+ EXPECT_EQ("000000000000000", format("%E15f", tp, tz));
+
+ // With subseconds.
+ tp += chrono::milliseconds(6) + chrono::microseconds(7) +
+ chrono::nanoseconds(8);
+ EXPECT_EQ("006007008", format("%E*f", tp, tz));
+ EXPECT_EQ("", format("%E0f", tp, tz));
+ EXPECT_EQ("0", format("%E1f", tp, tz));
+ EXPECT_EQ("00", format("%E2f", tp, tz));
+ EXPECT_EQ("006", format("%E3f", tp, tz));
+ EXPECT_EQ("0060", format("%E4f", tp, tz));
+ EXPECT_EQ("00600", format("%E5f", tp, tz));
+ EXPECT_EQ("006007", format("%E6f", tp, tz));
+ EXPECT_EQ("0060070", format("%E7f", tp, tz));
+ EXPECT_EQ("00600700", format("%E8f", tp, tz));
+ EXPECT_EQ("006007008", format("%E9f", tp, tz));
+ EXPECT_EQ("0060070080", format("%E10f", tp, tz));
+ EXPECT_EQ("00600700800", format("%E11f", tp, tz));
+ EXPECT_EQ("006007008000", format("%E12f", tp, tz));
+ EXPECT_EQ("0060070080000", format("%E13f", tp, tz));
+ EXPECT_EQ("00600700800000", format("%E14f", tp, tz));
+ EXPECT_EQ("006007008000000", format("%E15f", tp, tz));
+
+ // Times before the Unix epoch.
+ tp = chrono::system_clock::from_time_t(0) + chrono::microseconds(-1);
+ EXPECT_EQ("1969-12-31 23:59:59.999999",
+ format("%Y-%m-%d %H:%M:%S.%E*f", tp, tz));
+
+ // Here is a "%E*S" case we got wrong for a while. While the first
+ // instant below is correctly rendered as "...:07.333304", the second
+ // one used to appear as "...:07.33330499999999999".
+ tp = chrono::system_clock::from_time_t(0) +
+ chrono::microseconds(1395024427333304);
+ EXPECT_EQ("2014-03-17 02:47:07.333304",
+ format("%Y-%m-%d %H:%M:%S.%E*f", tp, tz));
+ tp += chrono::microseconds(1);
+ EXPECT_EQ("2014-03-17 02:47:07.333305",
+ format("%Y-%m-%d %H:%M:%S.%E*f", tp, tz));
+}
+
+TEST(Format, CompareExtendSecondsVsSubseconds) {
+ const time_zone tz = utc_time_zone();
+
+ // This test case illustrates the differences/similarities between:
+ // fmt_A: %E<prec>S
+ // fmt_B: %S.%E<prec>f
+ auto fmt_A = [](const std::string& prec) { return "%E" + prec + "S"; };
+ auto fmt_B = [](const std::string& prec) { return "%S.%E" + prec + "f"; };
+
+ // No subseconds:
+ time_point<chrono::nanoseconds> tp = chrono::system_clock::from_time_t(0);
+ tp += chrono::seconds(5);
+ // ... %E*S and %S.%E*f are different.
+ EXPECT_EQ("05", format(fmt_A("*"), tp, tz));
+ EXPECT_EQ("05.0", format(fmt_B("*"), tp, tz));
+ // ... %E0S and %S.%E0f are different.
+ EXPECT_EQ("05", format(fmt_A("0"), tp, tz));
+ EXPECT_EQ("05.", format(fmt_B("0"), tp, tz));
+ // ... %E<prec>S and %S.%E<prec>f are the same for prec in [1:15].
+ for (int prec = 1; prec <= 15; ++prec) {
+ const std::string a = format(fmt_A(std::to_string(prec)), tp, tz);
+ const std::string b = format(fmt_B(std::to_string(prec)), tp, tz);
+ EXPECT_EQ(a, b) << "prec=" << prec;
+ }
+
+ // With subseconds:
+ // ... %E*S and %S.%E*f are the same.
+ tp += chrono::milliseconds(6) + chrono::microseconds(7) +
+ chrono::nanoseconds(8);
+ EXPECT_EQ("05.006007008", format(fmt_A("*"), tp, tz));
+ EXPECT_EQ("05.006007008", format(fmt_B("*"), tp, tz));
+ // ... %E0S and %S.%E0f are different.
+ EXPECT_EQ("05", format(fmt_A("0"), tp, tz));
+ EXPECT_EQ("05.", format(fmt_B("0"), tp, tz));
+ // ... %E<prec>S and %S.%E<prec>f are the same for prec in [1:15].
+ for (int prec = 1; prec <= 15; ++prec) {
+ const std::string a = format(fmt_A(std::to_string(prec)), tp, tz);
+ const std::string b = format(fmt_B(std::to_string(prec)), tp, tz);
+ EXPECT_EQ(a, b) << "prec=" << prec;
+ }
+}
+
+TEST(Format, ExtendedOffset) {
+ const auto tp = chrono::system_clock::from_time_t(0);
+
+ auto tz = fixed_time_zone(absl::time_internal::cctz::seconds::zero());
+ TestFormatSpecifier(tp, tz, "%z", "+0000");
+ TestFormatSpecifier(tp, tz, "%:z", "+00:00");
+ TestFormatSpecifier(tp, tz, "%Ez", "+00:00");
+
+ tz = fixed_time_zone(chrono::seconds(56));
+ TestFormatSpecifier(tp, tz, "%z", "+0000");
+ TestFormatSpecifier(tp, tz, "%:z", "+00:00");
+ TestFormatSpecifier(tp, tz, "%Ez", "+00:00");
+
+ tz = fixed_time_zone(-chrono::seconds(56)); // NOTE: +00:00
+ TestFormatSpecifier(tp, tz, "%z", "+0000");
+ TestFormatSpecifier(tp, tz, "%:z", "+00:00");
+ TestFormatSpecifier(tp, tz, "%Ez", "+00:00");
+
+ tz = fixed_time_zone(chrono::minutes(34));
+ TestFormatSpecifier(tp, tz, "%z", "+0034");
+ TestFormatSpecifier(tp, tz, "%:z", "+00:34");
+ TestFormatSpecifier(tp, tz, "%Ez", "+00:34");
+
+ tz = fixed_time_zone(-chrono::minutes(34));
+ TestFormatSpecifier(tp, tz, "%z", "-0034");
+ TestFormatSpecifier(tp, tz, "%:z", "-00:34");
+ TestFormatSpecifier(tp, tz, "%Ez", "-00:34");
+
+ tz = fixed_time_zone(chrono::minutes(34) + chrono::seconds(56));
+ TestFormatSpecifier(tp, tz, "%z", "+0034");
+ TestFormatSpecifier(tp, tz, "%:z", "+00:34");
+ TestFormatSpecifier(tp, tz, "%Ez", "+00:34");
+
+ tz = fixed_time_zone(-chrono::minutes(34) - chrono::seconds(56));
+ TestFormatSpecifier(tp, tz, "%z", "-0034");
+ TestFormatSpecifier(tp, tz, "%:z", "-00:34");
+ TestFormatSpecifier(tp, tz, "%Ez", "-00:34");
+
+ tz = fixed_time_zone(chrono::hours(12));
+ TestFormatSpecifier(tp, tz, "%z", "+1200");
+ TestFormatSpecifier(tp, tz, "%:z", "+12:00");
+ TestFormatSpecifier(tp, tz, "%Ez", "+12:00");
+
+ tz = fixed_time_zone(-chrono::hours(12));
+ TestFormatSpecifier(tp, tz, "%z", "-1200");
+ TestFormatSpecifier(tp, tz, "%:z", "-12:00");
+ TestFormatSpecifier(tp, tz, "%Ez", "-12:00");
+
+ tz = fixed_time_zone(chrono::hours(12) + chrono::seconds(56));
+ TestFormatSpecifier(tp, tz, "%z", "+1200");
+ TestFormatSpecifier(tp, tz, "%:z", "+12:00");
+ TestFormatSpecifier(tp, tz, "%Ez", "+12:00");
+
+ tz = fixed_time_zone(-chrono::hours(12) - chrono::seconds(56));
+ TestFormatSpecifier(tp, tz, "%z", "-1200");
+ TestFormatSpecifier(tp, tz, "%:z", "-12:00");
+ TestFormatSpecifier(tp, tz, "%Ez", "-12:00");
+
+ tz = fixed_time_zone(chrono::hours(12) + chrono::minutes(34));
+ TestFormatSpecifier(tp, tz, "%z", "+1234");
+ TestFormatSpecifier(tp, tz, "%:z", "+12:34");
+ TestFormatSpecifier(tp, tz, "%Ez", "+12:34");
+
+ tz = fixed_time_zone(-chrono::hours(12) - chrono::minutes(34));
+ TestFormatSpecifier(tp, tz, "%z", "-1234");
+ TestFormatSpecifier(tp, tz, "%:z", "-12:34");
+ TestFormatSpecifier(tp, tz, "%Ez", "-12:34");
+
+ tz = fixed_time_zone(chrono::hours(12) + chrono::minutes(34) +
+ chrono::seconds(56));
+ TestFormatSpecifier(tp, tz, "%z", "+1234");
+ TestFormatSpecifier(tp, tz, "%:z", "+12:34");
+ TestFormatSpecifier(tp, tz, "%Ez", "+12:34");
+
+ tz = fixed_time_zone(-chrono::hours(12) - chrono::minutes(34) -
+ chrono::seconds(56));
+ TestFormatSpecifier(tp, tz, "%z", "-1234");
+ TestFormatSpecifier(tp, tz, "%:z", "-12:34");
+ TestFormatSpecifier(tp, tz, "%Ez", "-12:34");
+}
+
+TEST(Format, ExtendedSecondOffset) {
+ const auto tp = chrono::system_clock::from_time_t(0);
+
+ auto tz = fixed_time_zone(absl::time_internal::cctz::seconds::zero());
+ TestFormatSpecifier(tp, tz, "%E*z", "+00:00:00");
+ TestFormatSpecifier(tp, tz, "%::z", "+00:00:00");
+ TestFormatSpecifier(tp, tz, "%:::z", "+00");
+
+ tz = fixed_time_zone(chrono::seconds(56));
+ TestFormatSpecifier(tp, tz, "%E*z", "+00:00:56");
+ TestFormatSpecifier(tp, tz, "%::z", "+00:00:56");
+ TestFormatSpecifier(tp, tz, "%:::z", "+00:00:56");
+
+ tz = fixed_time_zone(-chrono::seconds(56));
+ TestFormatSpecifier(tp, tz, "%E*z", "-00:00:56");
+ TestFormatSpecifier(tp, tz, "%::z", "-00:00:56");
+ TestFormatSpecifier(tp, tz, "%:::z", "-00:00:56");
+
+ tz = fixed_time_zone(chrono::minutes(34));
+ TestFormatSpecifier(tp, tz, "%E*z", "+00:34:00");
+ TestFormatSpecifier(tp, tz, "%::z", "+00:34:00");
+ TestFormatSpecifier(tp, tz, "%:::z", "+00:34");
+
+ tz = fixed_time_zone(-chrono::minutes(34));
+ TestFormatSpecifier(tp, tz, "%E*z", "-00:34:00");
+ TestFormatSpecifier(tp, tz, "%::z", "-00:34:00");
+ TestFormatSpecifier(tp, tz, "%:::z", "-00:34");
+
+ tz = fixed_time_zone(chrono::minutes(34) + chrono::seconds(56));
+ TestFormatSpecifier(tp, tz, "%E*z", "+00:34:56");
+ TestFormatSpecifier(tp, tz, "%::z", "+00:34:56");
+ TestFormatSpecifier(tp, tz, "%:::z", "+00:34:56");
+
+ tz = fixed_time_zone(-chrono::minutes(34) - chrono::seconds(56));
+ TestFormatSpecifier(tp, tz, "%E*z", "-00:34:56");
+ TestFormatSpecifier(tp, tz, "%::z", "-00:34:56");
+ TestFormatSpecifier(tp, tz, "%:::z", "-00:34:56");
+
+ tz = fixed_time_zone(chrono::hours(12));
+ TestFormatSpecifier(tp, tz, "%E*z", "+12:00:00");
+ TestFormatSpecifier(tp, tz, "%::z", "+12:00:00");
+ TestFormatSpecifier(tp, tz, "%:::z", "+12");
+
+ tz = fixed_time_zone(-chrono::hours(12));
+ TestFormatSpecifier(tp, tz, "%E*z", "-12:00:00");
+ TestFormatSpecifier(tp, tz, "%::z", "-12:00:00");
+ TestFormatSpecifier(tp, tz, "%:::z", "-12");
+
+ tz = fixed_time_zone(chrono::hours(12) + chrono::seconds(56));
+ TestFormatSpecifier(tp, tz, "%E*z", "+12:00:56");
+ TestFormatSpecifier(tp, tz, "%::z", "+12:00:56");
+ TestFormatSpecifier(tp, tz, "%:::z", "+12:00:56");
+
+ tz = fixed_time_zone(-chrono::hours(12) - chrono::seconds(56));
+ TestFormatSpecifier(tp, tz, "%E*z", "-12:00:56");
+ TestFormatSpecifier(tp, tz, "%::z", "-12:00:56");
+ TestFormatSpecifier(tp, tz, "%:::z", "-12:00:56");
+
+ tz = fixed_time_zone(chrono::hours(12) + chrono::minutes(34));
+ TestFormatSpecifier(tp, tz, "%E*z", "+12:34:00");
+ TestFormatSpecifier(tp, tz, "%::z", "+12:34:00");
+ TestFormatSpecifier(tp, tz, "%:::z", "+12:34");
+
+ tz = fixed_time_zone(-chrono::hours(12) - chrono::minutes(34));
+ TestFormatSpecifier(tp, tz, "%E*z", "-12:34:00");
+ TestFormatSpecifier(tp, tz, "%::z", "-12:34:00");
+ TestFormatSpecifier(tp, tz, "%:::z", "-12:34");
+
+ tz = fixed_time_zone(chrono::hours(12) + chrono::minutes(34) +
+ chrono::seconds(56));
+ TestFormatSpecifier(tp, tz, "%E*z", "+12:34:56");
+ TestFormatSpecifier(tp, tz, "%::z", "+12:34:56");
+ TestFormatSpecifier(tp, tz, "%:::z", "+12:34:56");
+
+ tz = fixed_time_zone(-chrono::hours(12) - chrono::minutes(34) -
+ chrono::seconds(56));
+ TestFormatSpecifier(tp, tz, "%E*z", "-12:34:56");
+ TestFormatSpecifier(tp, tz, "%::z", "-12:34:56");
+ TestFormatSpecifier(tp, tz, "%:::z", "-12:34:56");
+}
+
+TEST(Format, ExtendedYears) {
+ const time_zone utc = utc_time_zone();
+ const char e4y_fmt[] = "%E4Y%m%d"; // no separators
+
+ // %E4Y zero-pads the year to produce at least 4 chars, including the sign.
+ auto tp = convert(civil_second(-999, 11, 27, 0, 0, 0), utc);
+ EXPECT_EQ("-9991127", format(e4y_fmt, tp, utc));
+ tp = convert(civil_second(-99, 11, 27, 0, 0, 0), utc);
+ EXPECT_EQ("-0991127", format(e4y_fmt, tp, utc));
+ tp = convert(civil_second(-9, 11, 27, 0, 0, 0), utc);
+ EXPECT_EQ("-0091127", format(e4y_fmt, tp, utc));
+ tp = convert(civil_second(-1, 11, 27, 0, 0, 0), utc);
+ EXPECT_EQ("-0011127", format(e4y_fmt, tp, utc));
+ tp = convert(civil_second(0, 11, 27, 0, 0, 0), utc);
+ EXPECT_EQ("00001127", format(e4y_fmt, tp, utc));
+ tp = convert(civil_second(1, 11, 27, 0, 0, 0), utc);
+ EXPECT_EQ("00011127", format(e4y_fmt, tp, utc));
+ tp = convert(civil_second(9, 11, 27, 0, 0, 0), utc);
+ EXPECT_EQ("00091127", format(e4y_fmt, tp, utc));
+ tp = convert(civil_second(99, 11, 27, 0, 0, 0), utc);
+ EXPECT_EQ("00991127", format(e4y_fmt, tp, utc));
+ tp = convert(civil_second(999, 11, 27, 0, 0, 0), utc);
+ EXPECT_EQ("09991127", format(e4y_fmt, tp, utc));
+ tp = convert(civil_second(9999, 11, 27, 0, 0, 0), utc);
+ EXPECT_EQ("99991127", format(e4y_fmt, tp, utc));
+
+ // When the year is outside [-999:9999], more than 4 chars are produced.
+ tp = convert(civil_second(-1000, 11, 27, 0, 0, 0), utc);
+ EXPECT_EQ("-10001127", format(e4y_fmt, tp, utc));
+ tp = convert(civil_second(10000, 11, 27, 0, 0, 0), utc);
+ EXPECT_EQ("100001127", format(e4y_fmt, tp, utc));
+}
+
+TEST(Format, RFC3339Format) {
+ time_zone tz;
+ EXPECT_TRUE(load_time_zone("America/Los_Angeles", &tz));
+
+ time_point<chrono::nanoseconds> tp =
+ convert(civil_second(1977, 6, 28, 9, 8, 7), tz);
+ EXPECT_EQ("1977-06-28T09:08:07-07:00", format(RFC3339_full, tp, tz));
+ EXPECT_EQ("1977-06-28T09:08:07-07:00", format(RFC3339_sec, tp, tz));
+
+ tp += chrono::milliseconds(100);
+ EXPECT_EQ("1977-06-28T09:08:07.1-07:00", format(RFC3339_full, tp, tz));
+ EXPECT_EQ("1977-06-28T09:08:07-07:00", format(RFC3339_sec, tp, tz));
+
+ tp += chrono::milliseconds(20);
+ EXPECT_EQ("1977-06-28T09:08:07.12-07:00", format(RFC3339_full, tp, tz));
+ EXPECT_EQ("1977-06-28T09:08:07-07:00", format(RFC3339_sec, tp, tz));
+
+ tp += chrono::milliseconds(3);
+ EXPECT_EQ("1977-06-28T09:08:07.123-07:00", format(RFC3339_full, tp, tz));
+ EXPECT_EQ("1977-06-28T09:08:07-07:00", format(RFC3339_sec, tp, tz));
+
+ tp += chrono::microseconds(400);
+ EXPECT_EQ("1977-06-28T09:08:07.1234-07:00", format(RFC3339_full, tp, tz));
+ EXPECT_EQ("1977-06-28T09:08:07-07:00", format(RFC3339_sec, tp, tz));
+
+ tp += chrono::microseconds(50);
+ EXPECT_EQ("1977-06-28T09:08:07.12345-07:00", format(RFC3339_full, tp, tz));
+ EXPECT_EQ("1977-06-28T09:08:07-07:00", format(RFC3339_sec, tp, tz));
+
+ tp += chrono::microseconds(6);
+ EXPECT_EQ("1977-06-28T09:08:07.123456-07:00", format(RFC3339_full, tp, tz));
+ EXPECT_EQ("1977-06-28T09:08:07-07:00", format(RFC3339_sec, tp, tz));
+
+ tp += chrono::nanoseconds(700);
+ EXPECT_EQ("1977-06-28T09:08:07.1234567-07:00", format(RFC3339_full, tp, tz));
+ EXPECT_EQ("1977-06-28T09:08:07-07:00", format(RFC3339_sec, tp, tz));
+
+ tp += chrono::nanoseconds(80);
+ EXPECT_EQ("1977-06-28T09:08:07.12345678-07:00", format(RFC3339_full, tp, tz));
+ EXPECT_EQ("1977-06-28T09:08:07-07:00", format(RFC3339_sec, tp, tz));
+
+ tp += chrono::nanoseconds(9);
+ EXPECT_EQ("1977-06-28T09:08:07.123456789-07:00",
+ format(RFC3339_full, tp, tz));
+ EXPECT_EQ("1977-06-28T09:08:07-07:00", format(RFC3339_sec, tp, tz));
+}
+
+TEST(Format, RFC1123Format) { // locale specific
+ time_zone tz;
+ EXPECT_TRUE(load_time_zone("America/Los_Angeles", &tz));
+
+ auto tp = convert(civil_second(1977, 6, 28, 9, 8, 7), tz);
+ EXPECT_EQ("Tue, 28 Jun 1977 09:08:07 -0700", format(RFC1123_full, tp, tz));
+ EXPECT_EQ("28 Jun 1977 09:08:07 -0700", format(RFC1123_no_wday, tp, tz));
+}
+
+TEST(Format, Week) {
+ const time_zone utc = utc_time_zone();
+
+ auto tp = convert(civil_second(2017, 1, 1, 0, 0, 0), utc);
+ EXPECT_EQ("2017-01-7", format("%Y-%U-%u", tp, utc));
+ EXPECT_EQ("2017-00-0", format("%Y-%W-%w", tp, utc));
+
+ tp = convert(civil_second(2017, 12, 31, 0, 0, 0), utc);
+ EXPECT_EQ("2017-53-7", format("%Y-%U-%u", tp, utc));
+ EXPECT_EQ("2017-52-0", format("%Y-%W-%w", tp, utc));
+
+ tp = convert(civil_second(2018, 1, 1, 0, 0, 0), utc);
+ EXPECT_EQ("2018-00-1", format("%Y-%U-%u", tp, utc));
+ EXPECT_EQ("2018-01-1", format("%Y-%W-%w", tp, utc));
+
+ tp = convert(civil_second(2018, 12, 31, 0, 0, 0), utc);
+ EXPECT_EQ("2018-52-1", format("%Y-%U-%u", tp, utc));
+ EXPECT_EQ("2018-53-1", format("%Y-%W-%w", tp, utc));
+
+ tp = convert(civil_second(2019, 1, 1, 0, 0, 0), utc);
+ EXPECT_EQ("2019-00-2", format("%Y-%U-%u", tp, utc));
+ EXPECT_EQ("2019-00-2", format("%Y-%W-%w", tp, utc));
+
+ tp = convert(civil_second(2019, 12, 31, 0, 0, 0), utc);
+ EXPECT_EQ("2019-52-2", format("%Y-%U-%u", tp, utc));
+ EXPECT_EQ("2019-52-2", format("%Y-%W-%w", tp, utc));
+}
+
+//
+// Testing parse()
+//
+
+TEST(Parse, TimePointResolution) {
+ const char kFmt[] = "%H:%M:%E*S";
+ const time_zone utc = utc_time_zone();
+
+ time_point<chrono::nanoseconds> tp_ns;
+ EXPECT_TRUE(parse(kFmt, "03:04:05.123456789", utc, &tp_ns));
+ EXPECT_EQ("03:04:05.123456789", format(kFmt, tp_ns, utc));
+ EXPECT_TRUE(parse(kFmt, "03:04:05.123456", utc, &tp_ns));
+ EXPECT_EQ("03:04:05.123456", format(kFmt, tp_ns, utc));
+
+ time_point<chrono::microseconds> tp_us;
+ EXPECT_TRUE(parse(kFmt, "03:04:05.123456789", utc, &tp_us));
+ EXPECT_EQ("03:04:05.123456", format(kFmt, tp_us, utc));
+ EXPECT_TRUE(parse(kFmt, "03:04:05.123456", utc, &tp_us));
+ EXPECT_EQ("03:04:05.123456", format(kFmt, tp_us, utc));
+ EXPECT_TRUE(parse(kFmt, "03:04:05.123", utc, &tp_us));
+ EXPECT_EQ("03:04:05.123", format(kFmt, tp_us, utc));
+
+ time_point<chrono::milliseconds> tp_ms;
+ EXPECT_TRUE(parse(kFmt, "03:04:05.123456", utc, &tp_ms));
+ EXPECT_EQ("03:04:05.123", format(kFmt, tp_ms, utc));
+ EXPECT_TRUE(parse(kFmt, "03:04:05.123", utc, &tp_ms));
+ EXPECT_EQ("03:04:05.123", format(kFmt, tp_ms, utc));
+ EXPECT_TRUE(parse(kFmt, "03:04:05", utc, &tp_ms));
+ EXPECT_EQ("03:04:05", format(kFmt, tp_ms, utc));
+
+ time_point<chrono::seconds> tp_s;
+ EXPECT_TRUE(parse(kFmt, "03:04:05.123", utc, &tp_s));
+ EXPECT_EQ("03:04:05", format(kFmt, tp_s, utc));
+ EXPECT_TRUE(parse(kFmt, "03:04:05", utc, &tp_s));
+ EXPECT_EQ("03:04:05", format(kFmt, tp_s, utc));
+
+ time_point<chrono::minutes> tp_m;
+ EXPECT_TRUE(parse(kFmt, "03:04:05", utc, &tp_m));
+ EXPECT_EQ("03:04:00", format(kFmt, tp_m, utc));
+
+ time_point<chrono::hours> tp_h;
+ EXPECT_TRUE(parse(kFmt, "03:04:05", utc, &tp_h));
+ EXPECT_EQ("03:00:00", format(kFmt, tp_h, utc));
+}
+
+TEST(Parse, TimePointExtendedResolution) {
+ const char kFmt[] = "%H:%M:%E*S";
+ const time_zone utc = utc_time_zone();
+
+ time_point<absl::time_internal::cctz::seconds> tp;
+ detail::femtoseconds fs;
+ EXPECT_TRUE(detail::parse(kFmt, "12:34:56.123456789012345", utc, &tp, &fs));
+ EXPECT_EQ("12:34:56.123456789012345", detail::format(kFmt, tp, fs, utc));
+ EXPECT_TRUE(detail::parse(kFmt, "12:34:56.012345678901234", utc, &tp, &fs));
+ EXPECT_EQ("12:34:56.012345678901234", detail::format(kFmt, tp, fs, utc));
+ EXPECT_TRUE(detail::parse(kFmt, "12:34:56.001234567890123", utc, &tp, &fs));
+ EXPECT_EQ("12:34:56.001234567890123", detail::format(kFmt, tp, fs, utc));
+ EXPECT_TRUE(detail::parse(kFmt, "12:34:56.000000000000123", utc, &tp, &fs));
+ EXPECT_EQ("12:34:56.000000000000123", detail::format(kFmt, tp, fs, utc));
+ EXPECT_TRUE(detail::parse(kFmt, "12:34:56.000000000000012", utc, &tp, &fs));
+ EXPECT_EQ("12:34:56.000000000000012", detail::format(kFmt, tp, fs, utc));
+ EXPECT_TRUE(detail::parse(kFmt, "12:34:56.000000000000001", utc, &tp, &fs));
+ EXPECT_EQ("12:34:56.000000000000001", detail::format(kFmt, tp, fs, utc));
+}
+
+TEST(Parse, Basics) {
+ time_zone tz = utc_time_zone();
+ time_point<chrono::nanoseconds> tp =
+ chrono::system_clock::from_time_t(1234567890);
+
+ // Simple edge cases.
+ EXPECT_TRUE(parse("", "", tz, &tp));
+ EXPECT_EQ(chrono::system_clock::from_time_t(0), tp); // everything defaulted
+ EXPECT_TRUE(parse(" ", " ", tz, &tp));
+ EXPECT_TRUE(parse(" ", " ", tz, &tp));
+ EXPECT_TRUE(parse("x", "x", tz, &tp));
+ EXPECT_TRUE(parse("xxx", "xxx", tz, &tp));
+
+ EXPECT_TRUE(
+ parse("%Y-%m-%d %H:%M:%S %z", "2013-06-28 19:08:09 -0800", tz, &tp));
+ ExpectTime(tp, tz, 2013, 6, 29, 3, 8, 9, 0, false, "UTC");
+}
+
+TEST(Parse, WithTimeZone) {
+ time_zone tz;
+ EXPECT_TRUE(load_time_zone("America/Los_Angeles", &tz));
+ time_point<chrono::nanoseconds> tp;
+
+ // We can parse a string without a UTC offset if we supply a timezone.
+ EXPECT_TRUE(parse("%Y-%m-%d %H:%M:%S", "2013-06-28 19:08:09", tz, &tp));
+ ExpectTime(tp, tz, 2013, 6, 28, 19, 8, 9, -7 * 60 * 60, true, "PDT");
+
+ // But the timezone is ignored when a UTC offset is present.
+ EXPECT_TRUE(parse("%Y-%m-%d %H:%M:%S %z", "2013-06-28 19:08:09 +0800",
+ utc_time_zone(), &tp));
+ ExpectTime(tp, tz, 2013, 6, 28, 19 - 8 - 7, 8, 9, -7 * 60 * 60, true, "PDT");
+
+ // Check a skipped time (a Spring DST transition). parse() uses the
+ // pre-transition offset.
+ EXPECT_TRUE(parse("%Y-%m-%d %H:%M:%S", "2011-03-13 02:15:00", tz, &tp));
+ ExpectTime(tp, tz, 2011, 3, 13, 3, 15, 0, -7 * 60 * 60, true, "PDT");
+
+ // Check a repeated time (a Fall DST transition). parse() uses the
+ // pre-transition offset.
+ EXPECT_TRUE(parse("%Y-%m-%d %H:%M:%S", "2011-11-06 01:15:00", tz, &tp));
+ ExpectTime(tp, tz, 2011, 11, 6, 1, 15, 0, -7 * 60 * 60, true, "PDT");
+}
+
+TEST(Parse, LeapSecond) {
+ time_zone tz;
+ EXPECT_TRUE(load_time_zone("America/Los_Angeles", &tz));
+ time_point<chrono::nanoseconds> tp;
+
+ // ":59" -> ":59"
+ EXPECT_TRUE(parse(RFC3339_full, "2013-06-28T07:08:59-08:00", tz, &tp));
+ ExpectTime(tp, tz, 2013, 6, 28, 8, 8, 59, -7 * 60 * 60, true, "PDT");
+
+ // ":59.5" -> ":59.5"
+ EXPECT_TRUE(parse(RFC3339_full, "2013-06-28T07:08:59.5-08:00", tz, &tp));
+ ExpectTime(tp, tz, 2013, 6, 28, 8, 8, 59, -7 * 60 * 60, true, "PDT");
+
+ // ":60" -> ":00"
+ EXPECT_TRUE(parse(RFC3339_full, "2013-06-28T07:08:60-08:00", tz, &tp));
+ ExpectTime(tp, tz, 2013, 6, 28, 8, 9, 0, -7 * 60 * 60, true, "PDT");
+
+ // ":60.5" -> ":00.0"
+ EXPECT_TRUE(parse(RFC3339_full, "2013-06-28T07:08:60.5-08:00", tz, &tp));
+ ExpectTime(tp, tz, 2013, 6, 28, 8, 9, 0, -7 * 60 * 60, true, "PDT");
+
+ // ":61" -> error
+ EXPECT_FALSE(parse(RFC3339_full, "2013-06-28T07:08:61-08:00", tz, &tp));
+}
+
+TEST(Parse, ErrorCases) {
+ const time_zone tz = utc_time_zone();
+ auto tp = chrono::system_clock::from_time_t(0);
+
+ // Illegal trailing data.
+ EXPECT_FALSE(parse("%S", "123", tz, &tp));
+
+ // Can't parse an illegal format specifier.
+ EXPECT_FALSE(parse("%Q", "x", tz, &tp));
+
+ // Fails because of trailing, unparsed data "blah".
+ EXPECT_FALSE(parse("%m-%d", "2-3 blah", tz, &tp));
+
+ // Trailing whitespace is allowed.
+ EXPECT_TRUE(parse("%m-%d", "2-3 ", tz, &tp));
+ EXPECT_EQ(2, convert(tp, utc_time_zone()).month());
+ EXPECT_EQ(3, convert(tp, utc_time_zone()).day());
+
+ // Feb 31 requires normalization.
+ EXPECT_FALSE(parse("%m-%d", "2-31", tz, &tp));
+
+ // Check that we cannot have spaces in UTC offsets.
+ EXPECT_TRUE(parse("%z", "-0203", tz, &tp));
+ EXPECT_FALSE(parse("%z", "- 2 3", tz, &tp));
+ EXPECT_TRUE(parse("%Ez", "-02:03", tz, &tp));
+ EXPECT_FALSE(parse("%Ez", "- 2: 3", tz, &tp));
+
+ // Check that we reject other malformed UTC offsets.
+ EXPECT_FALSE(parse("%Ez", "+-08:00", tz, &tp));
+ EXPECT_FALSE(parse("%Ez", "-+08:00", tz, &tp));
+
+ // Check that we do not accept "-0" in fields that allow zero.
+ EXPECT_FALSE(parse("%Y", "-0", tz, &tp));
+ EXPECT_FALSE(parse("%E4Y", "-0", tz, &tp));
+ EXPECT_FALSE(parse("%H", "-0", tz, &tp));
+ EXPECT_FALSE(parse("%M", "-0", tz, &tp));
+ EXPECT_FALSE(parse("%S", "-0", tz, &tp));
+ EXPECT_FALSE(parse("%z", "+-000", tz, &tp));
+ EXPECT_FALSE(parse("%Ez", "+-0:00", tz, &tp));
+ EXPECT_FALSE(parse("%z", "-00-0", tz, &tp));
+ EXPECT_FALSE(parse("%Ez", "-00:-0", tz, &tp));
+}
+
+TEST(Parse, PosixConversions) {
+ time_zone tz = utc_time_zone();
+ auto tp = chrono::system_clock::from_time_t(0);
+ const auto reset = convert(civil_second(1977, 6, 28, 9, 8, 7), tz);
+
+ tp = reset;
+ EXPECT_TRUE(parse("%d", "15", tz, &tp));
+ EXPECT_EQ(15, convert(tp, tz).day());
+
+ // %e is an extension, but is supported internally.
+ tp = reset;
+ EXPECT_TRUE(parse("%e", "15", tz, &tp));
+ EXPECT_EQ(15, convert(tp, tz).day()); // Equivalent to %d
+
+ tp = reset;
+ EXPECT_TRUE(parse("%H", "17", tz, &tp));
+ EXPECT_EQ(17, convert(tp, tz).hour());
+
+ tp = reset;
+ EXPECT_TRUE(parse("%I", "5", tz, &tp));
+ EXPECT_EQ(5, convert(tp, tz).hour());
+
+ // %j is parsed but ignored.
+ EXPECT_TRUE(parse("%j", "32", tz, &tp));
+
+ tp = reset;
+ EXPECT_TRUE(parse("%m", "11", tz, &tp));
+ EXPECT_EQ(11, convert(tp, tz).month());
+
+ tp = reset;
+ EXPECT_TRUE(parse("%M", "33", tz, &tp));
+ EXPECT_EQ(33, convert(tp, tz).minute());
+
+ tp = reset;
+ EXPECT_TRUE(parse("%S", "55", tz, &tp));
+ EXPECT_EQ(55, convert(tp, tz).second());
+
+ // %U is parsed but ignored.
+ EXPECT_TRUE(parse("%U", "15", tz, &tp));
+
+ // %w is parsed but ignored.
+ EXPECT_TRUE(parse("%w", "2", tz, &tp));
+
+ // %W is parsed but ignored.
+ EXPECT_TRUE(parse("%W", "22", tz, &tp));
+
+ tp = reset;
+ EXPECT_TRUE(parse("%y", "04", tz, &tp));
+ EXPECT_EQ(2004, convert(tp, tz).year());
+
+ tp = reset;
+ EXPECT_TRUE(parse("%Y", "2004", tz, &tp));
+ EXPECT_EQ(2004, convert(tp, tz).year());
+
+ EXPECT_TRUE(parse("%%", "%", tz, &tp));
+
+#if defined(__linux__)
+ // SU/C99/TZ extensions
+
+ // Because we handle each (non-internal) specifier in a separate call
+ // to strptime(), there is no way to group %C and %y together. So we
+ // just skip the %C/%y case.
+#if 0
+ tp = reset;
+ EXPECT_TRUE(parse("%C %y", "20 04", tz, &tp));
+ EXPECT_EQ(2004, convert(tp, tz).year());
+#endif
+
+ tp = reset;
+ EXPECT_TRUE(parse("%D", "02/03/04", tz, &tp));
+ EXPECT_EQ(2, convert(tp, tz).month());
+ EXPECT_EQ(3, convert(tp, tz).day());
+ EXPECT_EQ(2004, convert(tp, tz).year());
+
+ EXPECT_TRUE(parse("%n", "\n", tz, &tp));
+
+ tp = reset;
+ EXPECT_TRUE(parse("%R", "03:44", tz, &tp));
+ EXPECT_EQ(3, convert(tp, tz).hour());
+ EXPECT_EQ(44, convert(tp, tz).minute());
+
+ EXPECT_TRUE(parse("%t", "\t\v\f\n\r ", tz, &tp));
+
+ tp = reset;
+ EXPECT_TRUE(parse("%T", "03:44:55", tz, &tp));
+ EXPECT_EQ(3, convert(tp, tz).hour());
+ EXPECT_EQ(44, convert(tp, tz).minute());
+ EXPECT_EQ(55, convert(tp, tz).second());
+
+ tp = reset;
+ EXPECT_TRUE(parse("%s", "1234567890", tz, &tp));
+ EXPECT_EQ(chrono::system_clock::from_time_t(1234567890), tp);
+
+ // %s conversion, like %z/%Ez, pays no heed to the optional zone.
+ time_zone lax;
+ EXPECT_TRUE(load_time_zone("America/Los_Angeles", &lax));
+ tp = reset;
+ EXPECT_TRUE(parse("%s", "1234567890", lax, &tp));
+ EXPECT_EQ(chrono::system_clock::from_time_t(1234567890), tp);
+
+ // This is most important when the time has the same YMDhms
+ // breakdown in the zone as some other time. For example, ...
+ // 1414917000 in US/Pacific -> Sun Nov 2 01:30:00 2014 (PDT)
+ // 1414920600 in US/Pacific -> Sun Nov 2 01:30:00 2014 (PST)
+ tp = reset;
+ EXPECT_TRUE(parse("%s", "1414917000", lax, &tp));
+ EXPECT_EQ(chrono::system_clock::from_time_t(1414917000), tp);
+ tp = reset;
+ EXPECT_TRUE(parse("%s", "1414920600", lax, &tp));
+ EXPECT_EQ(chrono::system_clock::from_time_t(1414920600), tp);
+#endif
+}
+
+TEST(Parse, LocaleSpecific) {
+ time_zone tz = utc_time_zone();
+ auto tp = chrono::system_clock::from_time_t(0);
+ const auto reset = convert(civil_second(1977, 6, 28, 9, 8, 7), tz);
+
+ // %a is parsed but ignored.
+ EXPECT_TRUE(parse("%a", "Mon", tz, &tp));
+
+ // %A is parsed but ignored.
+ EXPECT_TRUE(parse("%A", "Monday", tz, &tp));
+
+ tp = reset;
+ EXPECT_TRUE(parse("%b", "Feb", tz, &tp));
+ EXPECT_EQ(2, convert(tp, tz).month());
+
+ tp = reset;
+ EXPECT_TRUE(parse("%B", "February", tz, &tp));
+ EXPECT_EQ(2, convert(tp, tz).month());
+
+ // %p is parsed but ignored if it's alone. But it's used with %I.
+ EXPECT_TRUE(parse("%p", "AM", tz, &tp));
+ tp = reset;
+ EXPECT_TRUE(parse("%I %p", "5 PM", tz, &tp));
+ EXPECT_EQ(17, convert(tp, tz).hour());
+
+ tp = reset;
+ EXPECT_TRUE(parse("%x", "02/03/04", tz, &tp));
+ if (convert(tp, tz).month() == 2) {
+ EXPECT_EQ(3, convert(tp, tz).day());
+ } else {
+ EXPECT_EQ(2, convert(tp, tz).day());
+ EXPECT_EQ(3, convert(tp, tz).month());
+ }
+ EXPECT_EQ(2004, convert(tp, tz).year());
+
+ tp = reset;
+ EXPECT_TRUE(parse("%X", "15:44:55", tz, &tp));
+ EXPECT_EQ(15, convert(tp, tz).hour());
+ EXPECT_EQ(44, convert(tp, tz).minute());
+ EXPECT_EQ(55, convert(tp, tz).second());
+
+#if defined(__linux__)
+ // SU/C99/TZ extensions
+
+ tp = reset;
+ EXPECT_TRUE(parse("%h", "Feb", tz, &tp));
+ EXPECT_EQ(2, convert(tp, tz).month()); // Equivalent to %b
+
+ tp = reset;
+ EXPECT_TRUE(parse("%l %p", "5 PM", tz, &tp));
+ EXPECT_EQ(17, convert(tp, tz).hour());
+
+ tp = reset;
+ EXPECT_TRUE(parse("%r", "03:44:55 PM", tz, &tp));
+ EXPECT_EQ(15, convert(tp, tz).hour());
+ EXPECT_EQ(44, convert(tp, tz).minute());
+ EXPECT_EQ(55, convert(tp, tz).second());
+
+ tp = reset;
+ EXPECT_TRUE(parse("%Ec", "Tue Nov 19 05:06:07 2013", tz, &tp));
+ EXPECT_EQ(convert(civil_second(2013, 11, 19, 5, 6, 7), tz), tp);
+
+ // Modified conversion specifiers %E_
+
+ tp = reset;
+ EXPECT_TRUE(parse("%Ex", "02/03/04", tz, &tp));
+ EXPECT_EQ(2, convert(tp, tz).month());
+ EXPECT_EQ(3, convert(tp, tz).day());
+ EXPECT_EQ(2004, convert(tp, tz).year());
+
+ tp = reset;
+ EXPECT_TRUE(parse("%EX", "15:44:55", tz, &tp));
+ EXPECT_EQ(15, convert(tp, tz).hour());
+ EXPECT_EQ(44, convert(tp, tz).minute());
+ EXPECT_EQ(55, convert(tp, tz).second());
+
+ // %Ey, the year offset from %EC, doesn't really make sense alone as there
+ // is no way to represent it in tm_year (%EC is not simply the century).
+ // Yet, because we handle each (non-internal) specifier in a separate call
+ // to strptime(), there is no way to group %EC and %Ey either. So we just
+ // skip the %EC and %Ey cases.
+
+ tp = reset;
+ EXPECT_TRUE(parse("%EY", "2004", tz, &tp));
+ EXPECT_EQ(2004, convert(tp, tz).year());
+
+ // Modified conversion specifiers %O_
+
+ tp = reset;
+ EXPECT_TRUE(parse("%Od", "15", tz, &tp));
+ EXPECT_EQ(15, convert(tp, tz).day());
+
+ tp = reset;
+ EXPECT_TRUE(parse("%Oe", "15", tz, &tp));
+ EXPECT_EQ(15, convert(tp, tz).day()); // Equivalent to %d
+
+ tp = reset;
+ EXPECT_TRUE(parse("%OH", "17", tz, &tp));
+ EXPECT_EQ(17, convert(tp, tz).hour());
+
+ tp = reset;
+ EXPECT_TRUE(parse("%OI", "5", tz, &tp));
+ EXPECT_EQ(5, convert(tp, tz).hour());
+
+ tp = reset;
+ EXPECT_TRUE(parse("%Om", "11", tz, &tp));
+ EXPECT_EQ(11, convert(tp, tz).month());
+
+ tp = reset;
+ EXPECT_TRUE(parse("%OM", "33", tz, &tp));
+ EXPECT_EQ(33, convert(tp, tz).minute());
+
+ tp = reset;
+ EXPECT_TRUE(parse("%OS", "55", tz, &tp));
+ EXPECT_EQ(55, convert(tp, tz).second());
+
+ // %OU is parsed but ignored.
+ EXPECT_TRUE(parse("%OU", "15", tz, &tp));
+
+ // %Ow is parsed but ignored.
+ EXPECT_TRUE(parse("%Ow", "2", tz, &tp));
+
+ // %OW is parsed but ignored.
+ EXPECT_TRUE(parse("%OW", "22", tz, &tp));
+
+ tp = reset;
+ EXPECT_TRUE(parse("%Oy", "04", tz, &tp));
+ EXPECT_EQ(2004, convert(tp, tz).year());
+#endif
+}
+
+TEST(Parse, ExtendedSeconds) {
+ const time_zone tz = utc_time_zone();
+ const time_point<chrono::nanoseconds> unix_epoch =
+ chrono::system_clock::from_time_t(0);
+
+ // All %E<prec>S cases are treated the same as %E*S on input.
+ auto precisions = {"*", "0", "1", "2", "3", "4", "5", "6", "7",
+ "8", "9", "10", "11", "12", "13", "14", "15"};
+ for (const std::string& prec : precisions) {
+ const std::string fmt = "%E" + prec + "S";
+ SCOPED_TRACE(fmt);
+ time_point<chrono::nanoseconds> tp = unix_epoch;
+ EXPECT_TRUE(parse(fmt, "5", tz, &tp));
+ EXPECT_EQ(unix_epoch + chrono::seconds(5), tp);
+ tp = unix_epoch;
+ EXPECT_TRUE(parse(fmt, "05", tz, &tp));
+ EXPECT_EQ(unix_epoch + chrono::seconds(5), tp);
+ tp = unix_epoch;
+ EXPECT_TRUE(parse(fmt, "05.0", tz, &tp));
+ EXPECT_EQ(unix_epoch + chrono::seconds(5), tp);
+ tp = unix_epoch;
+ EXPECT_TRUE(parse(fmt, "05.00", tz, &tp));
+ EXPECT_EQ(unix_epoch + chrono::seconds(5), tp);
+ tp = unix_epoch;
+ EXPECT_TRUE(parse(fmt, "05.6", tz, &tp));
+ EXPECT_EQ(unix_epoch + chrono::seconds(5) + chrono::milliseconds(600), tp);
+ tp = unix_epoch;
+ EXPECT_TRUE(parse(fmt, "05.60", tz, &tp));
+ EXPECT_EQ(unix_epoch + chrono::seconds(5) + chrono::milliseconds(600), tp);
+ tp = unix_epoch;
+ EXPECT_TRUE(parse(fmt, "05.600", tz, &tp));
+ EXPECT_EQ(unix_epoch + chrono::seconds(5) + chrono::milliseconds(600), tp);
+ tp = unix_epoch;
+ EXPECT_TRUE(parse(fmt, "05.67", tz, &tp));
+ EXPECT_EQ(unix_epoch + chrono::seconds(5) + chrono::milliseconds(670), tp);
+ tp = unix_epoch;
+ EXPECT_TRUE(parse(fmt, "05.670", tz, &tp));
+ EXPECT_EQ(unix_epoch + chrono::seconds(5) + chrono::milliseconds(670), tp);
+ tp = unix_epoch;
+ EXPECT_TRUE(parse(fmt, "05.678", tz, &tp));
+ EXPECT_EQ(unix_epoch + chrono::seconds(5) + chrono::milliseconds(678), tp);
+ }
+
+ // Here is a "%E*S" case we got wrong for a while. The fractional
+ // part of the first instant is less than 2^31 and was correctly
+ // parsed, while the second (and any subsecond field >=2^31) failed.
+ time_point<chrono::nanoseconds> tp = unix_epoch;
+ EXPECT_TRUE(parse("%E*S", "0.2147483647", tz, &tp));
+ EXPECT_EQ(unix_epoch + chrono::nanoseconds(214748364), tp);
+ tp = unix_epoch;
+ EXPECT_TRUE(parse("%E*S", "0.2147483648", tz, &tp));
+ EXPECT_EQ(unix_epoch + chrono::nanoseconds(214748364), tp);
+
+ // We should also be able to specify long strings of digits far
+ // beyond the current resolution and have them convert the same way.
+ tp = unix_epoch;
+ EXPECT_TRUE(parse(
+ "%E*S", "0.214748364801234567890123456789012345678901234567890123456789",
+ tz, &tp));
+ EXPECT_EQ(unix_epoch + chrono::nanoseconds(214748364), tp);
+}
+
+TEST(Parse, ExtendedSecondsScan) {
+ const time_zone tz = utc_time_zone();
+ time_point<chrono::nanoseconds> tp;
+ for (int ms = 0; ms < 1000; ms += 111) {
+ for (int us = 0; us < 1000; us += 27) {
+ const int micros = ms * 1000 + us;
+ for (int ns = 0; ns < 1000; ns += 9) {
+ const auto expected = chrono::system_clock::from_time_t(0) +
+ chrono::nanoseconds(micros * 1000 + ns);
+ std::ostringstream oss;
+ oss << "0." << std::setfill('0') << std::setw(3);
+ oss << ms << std::setw(3) << us << std::setw(3) << ns;
+ const std::string input = oss.str();
+ EXPECT_TRUE(parse("%E*S", input, tz, &tp));
+ EXPECT_EQ(expected, tp) << input;
+ }
+ }
+ }
+}
+
+TEST(Parse, ExtendedSubeconds) {
+ const time_zone tz = utc_time_zone();
+ const time_point<chrono::nanoseconds> unix_epoch =
+ chrono::system_clock::from_time_t(0);
+
+ // All %E<prec>f cases are treated the same as %E*f on input.
+ auto precisions = {"*", "0", "1", "2", "3", "4", "5", "6", "7",
+ "8", "9", "10", "11", "12", "13", "14", "15"};
+ for (const std::string& prec : precisions) {
+ const std::string fmt = "%E" + prec + "f";
+ SCOPED_TRACE(fmt);
+ time_point<chrono::nanoseconds> tp = unix_epoch - chrono::seconds(1);
+ EXPECT_TRUE(parse(fmt, "", tz, &tp));
+ EXPECT_EQ(unix_epoch, tp);
+ tp = unix_epoch;
+ EXPECT_TRUE(parse(fmt, "6", tz, &tp));
+ EXPECT_EQ(unix_epoch + chrono::milliseconds(600), tp);
+ tp = unix_epoch;
+ EXPECT_TRUE(parse(fmt, "60", tz, &tp));
+ EXPECT_EQ(unix_epoch + chrono::milliseconds(600), tp);
+ tp = unix_epoch;
+ EXPECT_TRUE(parse(fmt, "600", tz, &tp));
+ EXPECT_EQ(unix_epoch + chrono::milliseconds(600), tp);
+ tp = unix_epoch;
+ EXPECT_TRUE(parse(fmt, "67", tz, &tp));
+ EXPECT_EQ(unix_epoch + chrono::milliseconds(670), tp);
+ tp = unix_epoch;
+ EXPECT_TRUE(parse(fmt, "670", tz, &tp));
+ EXPECT_EQ(unix_epoch + chrono::milliseconds(670), tp);
+ tp = unix_epoch;
+ EXPECT_TRUE(parse(fmt, "678", tz, &tp));
+ EXPECT_EQ(unix_epoch + chrono::milliseconds(678), tp);
+ tp = unix_epoch;
+ EXPECT_TRUE(parse(fmt, "6789", tz, &tp));
+ EXPECT_EQ(
+ unix_epoch + chrono::milliseconds(678) + chrono::microseconds(900), tp);
+ }
+
+ // Here is a "%E*f" case we got wrong for a while. The fractional
+ // part of the first instant is less than 2^31 and was correctly
+ // parsed, while the second (and any subsecond field >=2^31) failed.
+ time_point<chrono::nanoseconds> tp = unix_epoch;
+ EXPECT_TRUE(parse("%E*f", "2147483647", tz, &tp));
+ EXPECT_EQ(unix_epoch + chrono::nanoseconds(214748364), tp);
+ tp = unix_epoch;
+ EXPECT_TRUE(parse("%E*f", "2147483648", tz, &tp));
+ EXPECT_EQ(unix_epoch + chrono::nanoseconds(214748364), tp);
+
+ // We should also be able to specify long strings of digits far
+ // beyond the current resolution and have them convert the same way.
+ tp = unix_epoch;
+ EXPECT_TRUE(parse(
+ "%E*f", "214748364801234567890123456789012345678901234567890123456789",
+ tz, &tp));
+ EXPECT_EQ(unix_epoch + chrono::nanoseconds(214748364), tp);
+}
+
+TEST(Parse, ExtendedSubecondsScan) {
+ time_point<chrono::nanoseconds> tp;
+ const time_zone tz = utc_time_zone();
+ for (int ms = 0; ms < 1000; ms += 111) {
+ for (int us = 0; us < 1000; us += 27) {
+ const int micros = ms * 1000 + us;
+ for (int ns = 0; ns < 1000; ns += 9) {
+ std::ostringstream oss;
+ oss << std::setfill('0') << std::setw(3) << ms;
+ oss << std::setw(3) << us << std::setw(3) << ns;
+ const std::string nanos = oss.str();
+ const auto expected = chrono::system_clock::from_time_t(0) +
+ chrono::nanoseconds(micros * 1000 + ns);
+ for (int ps = 0; ps < 1000; ps += 250) {
+ std::ostringstream ps_oss;
+ oss << std::setfill('0') << std::setw(3) << ps;
+ const std::string input = nanos + ps_oss.str() + "999";
+ EXPECT_TRUE(parse("%E*f", input, tz, &tp));
+ EXPECT_EQ(expected + chrono::nanoseconds(ps) / 1000, tp) << input;
+ }
+ }
+ }
+ }
+}
+
+TEST(Parse, ExtendedOffset) {
+ const time_zone utc = utc_time_zone();
+ time_point<absl::time_internal::cctz::seconds> tp;
+
+ EXPECT_TRUE(parse("%Ez", "+00:00", utc, &tp));
+ EXPECT_EQ(convert(civil_second(1970, 1, 1, 0, 0, 0), utc), tp);
+ EXPECT_TRUE(parse("%Ez", "-12:34", utc, &tp));
+ EXPECT_EQ(convert(civil_second(1970, 1, 1, 12, 34, 0), utc), tp);
+ EXPECT_TRUE(parse("%Ez", "+12:34", utc, &tp));
+ EXPECT_EQ(convert(civil_second(1969, 12, 31, 11, 26, 0), utc), tp);
+ EXPECT_FALSE(parse("%Ez", "-12:3", utc, &tp));
+
+ for (auto fmt : {"%Ez", "%z"}) {
+ EXPECT_TRUE(parse(fmt, "+0000", utc, &tp));
+ EXPECT_EQ(convert(civil_second(1970, 1, 1, 0, 0, 0), utc), tp);
+ EXPECT_TRUE(parse(fmt, "-1234", utc, &tp));
+ EXPECT_EQ(convert(civil_second(1970, 1, 1, 12, 34, 0), utc), tp);
+ EXPECT_TRUE(parse(fmt, "+1234", utc, &tp));
+ EXPECT_EQ(convert(civil_second(1969, 12, 31, 11, 26, 0), utc), tp);
+ EXPECT_FALSE(parse(fmt, "-123", utc, &tp));
+
+ EXPECT_TRUE(parse(fmt, "+00", utc, &tp));
+ EXPECT_EQ(convert(civil_second(1970, 1, 1, 0, 0, 0), utc), tp);
+ EXPECT_TRUE(parse(fmt, "-12", utc, &tp));
+ EXPECT_EQ(convert(civil_second(1970, 1, 1, 12, 0, 0), utc), tp);
+ EXPECT_TRUE(parse(fmt, "+12", utc, &tp));
+ EXPECT_EQ(convert(civil_second(1969, 12, 31, 12, 0, 0), utc), tp);
+ EXPECT_FALSE(parse(fmt, "-1", utc, &tp));
+ }
+}
+
+TEST(Parse, ExtendedSecondOffset) {
+ const time_zone utc = utc_time_zone();
+ time_point<absl::time_internal::cctz::seconds> tp;
+
+ for (auto fmt : {"%Ez", "%E*z", "%:z", "%::z", "%:::z"}) {
+ EXPECT_TRUE(parse(fmt, "+00:00:00", utc, &tp));
+ EXPECT_EQ(convert(civil_second(1970, 1, 1, 0, 0, 0), utc), tp);
+ EXPECT_TRUE(parse(fmt, "-12:34:56", utc, &tp));
+ EXPECT_EQ(convert(civil_second(1970, 1, 1, 12, 34, 56), utc), tp);
+ EXPECT_TRUE(parse(fmt, "+12:34:56", utc, &tp));
+ EXPECT_EQ(convert(civil_second(1969, 12, 31, 11, 25, 4), utc), tp);
+ EXPECT_FALSE(parse(fmt, "-12:34:5", utc, &tp));
+
+ EXPECT_TRUE(parse(fmt, "+000000", utc, &tp));
+ EXPECT_EQ(convert(civil_second(1970, 1, 1, 0, 0, 0), utc), tp);
+ EXPECT_TRUE(parse(fmt, "-123456", utc, &tp));
+ EXPECT_EQ(convert(civil_second(1970, 1, 1, 12, 34, 56), utc), tp);
+ EXPECT_TRUE(parse(fmt, "+123456", utc, &tp));
+ EXPECT_EQ(convert(civil_second(1969, 12, 31, 11, 25, 4), utc), tp);
+ EXPECT_FALSE(parse(fmt, "-12345", utc, &tp));
+
+ EXPECT_TRUE(parse(fmt, "+00:00", utc, &tp));
+ EXPECT_EQ(convert(civil_second(1970, 1, 1, 0, 0, 0), utc), tp);
+ EXPECT_TRUE(parse(fmt, "-12:34", utc, &tp));
+ EXPECT_EQ(convert(civil_second(1970, 1, 1, 12, 34, 0), utc), tp);
+ EXPECT_TRUE(parse(fmt, "+12:34", utc, &tp));
+ EXPECT_EQ(convert(civil_second(1969, 12, 31, 11, 26, 0), utc), tp);
+ EXPECT_FALSE(parse(fmt, "-12:3", utc, &tp));
+
+ EXPECT_TRUE(parse(fmt, "+0000", utc, &tp));
+ EXPECT_EQ(convert(civil_second(1970, 1, 1, 0, 0, 0), utc), tp);
+ EXPECT_TRUE(parse(fmt, "-1234", utc, &tp));
+ EXPECT_EQ(convert(civil_second(1970, 1, 1, 12, 34, 0), utc), tp);
+ EXPECT_TRUE(parse(fmt, "+1234", utc, &tp));
+ EXPECT_EQ(convert(civil_second(1969, 12, 31, 11, 26, 0), utc), tp);
+ EXPECT_FALSE(parse(fmt, "-123", utc, &tp));
+
+ EXPECT_TRUE(parse(fmt, "+00", utc, &tp));
+ EXPECT_EQ(convert(civil_second(1970, 1, 1, 0, 0, 0), utc), tp);
+ EXPECT_TRUE(parse(fmt, "-12", utc, &tp));
+ EXPECT_EQ(convert(civil_second(1970, 1, 1, 12, 0, 0), utc), tp);
+ EXPECT_TRUE(parse(fmt, "+12", utc, &tp));
+ EXPECT_EQ(convert(civil_second(1969, 12, 31, 12, 0, 0), utc), tp);
+ EXPECT_FALSE(parse(fmt, "-1", utc, &tp));
+ }
+}
+
+TEST(Parse, ExtendedYears) {
+ const time_zone utc = utc_time_zone();
+ const char e4y_fmt[] = "%E4Y%m%d"; // no separators
+ time_point<absl::time_internal::cctz::seconds> tp;
+
+ // %E4Y consumes exactly four chars, including any sign.
+ EXPECT_TRUE(parse(e4y_fmt, "-9991127", utc, &tp));
+ EXPECT_EQ(convert(civil_second(-999, 11, 27, 0, 0, 0), utc), tp);
+ EXPECT_TRUE(parse(e4y_fmt, "-0991127", utc, &tp));
+ EXPECT_EQ(convert(civil_second(-99, 11, 27, 0, 0, 0), utc), tp);
+ EXPECT_TRUE(parse(e4y_fmt, "-0091127", utc, &tp));
+ EXPECT_EQ(convert(civil_second(-9, 11, 27, 0, 0, 0), utc), tp);
+ EXPECT_TRUE(parse(e4y_fmt, "-0011127", utc, &tp));
+ EXPECT_EQ(convert(civil_second(-1, 11, 27, 0, 0, 0), utc), tp);
+ EXPECT_TRUE(parse(e4y_fmt, "00001127", utc, &tp));
+ EXPECT_EQ(convert(civil_second(0, 11, 27, 0, 0, 0), utc), tp);
+ EXPECT_TRUE(parse(e4y_fmt, "00011127", utc, &tp));
+ EXPECT_EQ(convert(civil_second(1, 11, 27, 0, 0, 0), utc), tp);
+ EXPECT_TRUE(parse(e4y_fmt, "00091127", utc, &tp));
+ EXPECT_EQ(convert(civil_second(9, 11, 27, 0, 0, 0), utc), tp);
+ EXPECT_TRUE(parse(e4y_fmt, "00991127", utc, &tp));
+ EXPECT_EQ(convert(civil_second(99, 11, 27, 0, 0, 0), utc), tp);
+ EXPECT_TRUE(parse(e4y_fmt, "09991127", utc, &tp));
+ EXPECT_EQ(convert(civil_second(999, 11, 27, 0, 0, 0), utc), tp);
+ EXPECT_TRUE(parse(e4y_fmt, "99991127", utc, &tp));
+ EXPECT_EQ(convert(civil_second(9999, 11, 27, 0, 0, 0), utc), tp);
+
+ // When the year is outside [-999:9999], the parse fails.
+ EXPECT_FALSE(parse(e4y_fmt, "-10001127", utc, &tp));
+ EXPECT_FALSE(parse(e4y_fmt, "100001127", utc, &tp));
+}
+
+TEST(Parse, RFC3339Format) {
+ const time_zone tz = utc_time_zone();
+ time_point<chrono::nanoseconds> tp;
+ EXPECT_TRUE(parse(RFC3339_sec, "2014-02-12T20:21:00+00:00", tz, &tp));
+ ExpectTime(tp, tz, 2014, 2, 12, 20, 21, 0, 0, false, "UTC");
+
+ // Check that %ET also accepts "t".
+ time_point<chrono::nanoseconds> tp2;
+ EXPECT_TRUE(parse(RFC3339_sec, "2014-02-12t20:21:00+00:00", tz, &tp2));
+ EXPECT_EQ(tp, tp2);
+
+ // Check that %Ez also accepts "Z" as a synonym for "+00:00".
+ time_point<chrono::nanoseconds> tp3;
+ EXPECT_TRUE(parse(RFC3339_sec, "2014-02-12T20:21:00Z", tz, &tp3));
+ EXPECT_EQ(tp, tp3);
+
+ // Check that %Ez also accepts "z" as a synonym for "+00:00".
+ time_point<chrono::nanoseconds> tp4;
+ EXPECT_TRUE(parse(RFC3339_sec, "2014-02-12T20:21:00z", tz, &tp4));
+ EXPECT_EQ(tp, tp4);
+}
+
+TEST(Parse, Week) {
+ const time_zone utc = utc_time_zone();
+ time_point<absl::time_internal::cctz::seconds> tp;
+
+ auto exp = convert(civil_second(2017, 1, 1, 0, 0, 0), utc);
+ EXPECT_TRUE(parse("%Y-%U-%u", "2017-01-7", utc, &tp));
+ EXPECT_EQ(exp, tp);
+ EXPECT_TRUE(parse("%Y-%W-%w", "2017-00-0", utc, &tp));
+ EXPECT_EQ(exp, tp);
+
+ exp = convert(civil_second(2017, 12, 31, 0, 0, 0), utc);
+ EXPECT_TRUE(parse("%Y-%U-%u", "2017-53-7", utc, &tp));
+ EXPECT_EQ(exp, tp);
+ EXPECT_TRUE(parse("%Y-%W-%w", "2017-52-0", utc, &tp));
+ EXPECT_EQ(exp, tp);
+
+ exp = convert(civil_second(2018, 1, 1, 0, 0, 0), utc);
+ EXPECT_TRUE(parse("%Y-%U-%u", "2018-00-1", utc, &tp));
+ EXPECT_EQ(exp, tp);
+ EXPECT_TRUE(parse("%Y-%W-%w", "2018-01-1", utc, &tp));
+ EXPECT_EQ(exp, tp);
+
+ exp = convert(civil_second(2018, 12, 31, 0, 0, 0), utc);
+ EXPECT_TRUE(parse("%Y-%U-%u", "2018-52-1", utc, &tp));
+ EXPECT_EQ(exp, tp);
+ EXPECT_TRUE(parse("%Y-%W-%w", "2018-53-1", utc, &tp));
+ EXPECT_EQ(exp, tp);
+
+ exp = convert(civil_second(2019, 1, 1, 0, 0, 0), utc);
+ EXPECT_TRUE(parse("%Y-%U-%u", "2019-00-2", utc, &tp));
+ EXPECT_EQ(exp, tp);
+ EXPECT_TRUE(parse("%Y-%W-%w", "2019-00-2", utc, &tp));
+ EXPECT_EQ(exp, tp);
+
+ exp = convert(civil_second(2019, 12, 31, 0, 0, 0), utc);
+ EXPECT_TRUE(parse("%Y-%U-%u", "2019-52-2", utc, &tp));
+ EXPECT_EQ(exp, tp);
+ EXPECT_TRUE(parse("%Y-%W-%w", "2019-52-2", utc, &tp));
+ EXPECT_EQ(exp, tp);
+}
+
+TEST(Parse, WeekYearShift) {
+ // %U/%W conversions with week values in {0, 52, 53} can slip
+ // into the previous/following calendar years.
+ const time_zone utc = utc_time_zone();
+ time_point<absl::time_internal::cctz::seconds> tp;
+
+ auto exp = convert(civil_second(2019, 12, 31, 0, 0, 0), utc);
+ EXPECT_TRUE(parse("%Y-%U-%u", "2020-00-2", utc, &tp));
+ EXPECT_EQ(exp, tp);
+ EXPECT_TRUE(parse("%Y-%W-%w", "2020-00-2", utc, &tp));
+ EXPECT_EQ(exp, tp);
+
+ exp = convert(civil_second(2021, 1, 1, 0, 0, 0), utc);
+ EXPECT_TRUE(parse("%Y-%U-%u", "2020-52-5", utc, &tp));
+ EXPECT_EQ(exp, tp);
+ EXPECT_TRUE(parse("%Y-%W-%w", "2020-52-5", utc, &tp));
+ EXPECT_EQ(exp, tp);
+
+ // Slipping into the previous/following calendar years should fail when
+ // we're already at the extremes.
+ EXPECT_FALSE(parse("%Y-%U-%u", "-9223372036854775808-0-7", utc, &tp));
+ EXPECT_FALSE(parse("%Y-%U-%u", "9223372036854775807-53-7", utc, &tp));
+}
+
+TEST(Parse, MaxRange) {
+ const time_zone utc = utc_time_zone();
+ time_point<absl::time_internal::cctz::seconds> tp;
+
+ // tests the upper limit using +00:00 offset
+ EXPECT_TRUE(
+ parse(RFC3339_sec, "292277026596-12-04T15:30:07+00:00", utc, &tp));
+ EXPECT_EQ(tp, time_point<absl::time_internal::cctz::seconds>::max());
+ EXPECT_FALSE(
+ parse(RFC3339_sec, "292277026596-12-04T15:30:08+00:00", utc, &tp));
+
+ // tests the upper limit using -01:00 offset
+ EXPECT_TRUE(
+ parse(RFC3339_sec, "292277026596-12-04T14:30:07-01:00", utc, &tp));
+ EXPECT_EQ(tp, time_point<absl::time_internal::cctz::seconds>::max());
+ EXPECT_FALSE(
+ parse(RFC3339_sec, "292277026596-12-04T15:30:07-01:00", utc, &tp));
+
+ // tests the lower limit using +00:00 offset
+ EXPECT_TRUE(
+ parse(RFC3339_sec, "-292277022657-01-27T08:29:52+00:00", utc, &tp));
+ EXPECT_EQ(tp, time_point<absl::time_internal::cctz::seconds>::min());
+ EXPECT_FALSE(
+ parse(RFC3339_sec, "-292277022657-01-27T08:29:51+00:00", utc, &tp));
+
+ // tests the lower limit using +01:00 offset
+ EXPECT_TRUE(
+ parse(RFC3339_sec, "-292277022657-01-27T09:29:52+01:00", utc, &tp));
+ EXPECT_EQ(tp, time_point<absl::time_internal::cctz::seconds>::min());
+ EXPECT_FALSE(
+ parse(RFC3339_sec, "-292277022657-01-27T08:29:51+01:00", utc, &tp));
+
+ // tests max/min civil-second overflow
+ EXPECT_FALSE(
+ parse(RFC3339_sec, "9223372036854775807-12-31T23:59:59-00:01", utc, &tp));
+ EXPECT_FALSE(parse(RFC3339_sec, "-9223372036854775808-01-01T00:00:00+00:01",
+ utc, &tp));
+
+ // TODO: Add tests that parsing times with fractional seconds overflow
+ // appropriately. This can't be done until cctz::parse() properly detects
+ // overflow when combining the chrono seconds and femto.
+}
+
+//
+// Roundtrip test for format()/parse().
+//
+
+TEST(FormatParse, RoundTrip) {
+ time_zone lax;
+ EXPECT_TRUE(load_time_zone("America/Los_Angeles", &lax));
+ const auto in = convert(civil_second(1977, 6, 28, 9, 8, 7), lax);
+ const auto subseconds = chrono::nanoseconds(654321);
+
+ // RFC3339, which renders subseconds.
+ {
+ time_point<chrono::nanoseconds> out;
+ const std::string s = format(RFC3339_full, in + subseconds, lax);
+ EXPECT_TRUE(parse(RFC3339_full, s, lax, &out)) << s;
+ EXPECT_EQ(in + subseconds, out); // RFC3339_full includes %Ez
+ }
+
+ // RFC1123, which only does whole seconds.
+ {
+ time_point<chrono::nanoseconds> out;
+ const std::string s = format(RFC1123_full, in, lax);
+ EXPECT_TRUE(parse(RFC1123_full, s, lax, &out)) << s;
+ EXPECT_EQ(in, out); // RFC1123_full includes %z
+ }
+
+#if defined(_WIN32) || defined(_WIN64)
+ // Initial investigations indicate the %c does not roundtrip on Windows.
+ // TODO: Figure out what is going on here (perhaps a locale problem).
+#elif defined(__EMSCRIPTEN__)
+ // strftime() and strptime() use different defintions for "%c" under
+ // emscripten (see https://github.com/kripken/emscripten/pull/7491),
+ // causing its round-trip test to fail.
+#else
+ // Even though we don't know what %c will produce, it should roundtrip,
+ // but only in the 0-offset timezone.
+ {
+ time_point<chrono::nanoseconds> out;
+ time_zone utc = utc_time_zone();
+ const std::string s = format("%c", in, utc);
+ EXPECT_TRUE(parse("%c", s, utc, &out)) << s;
+ EXPECT_EQ(in, out);
+ }
+#endif
+}
+
+TEST(FormatParse, RoundTripDistantFuture) {
+ const time_zone utc = utc_time_zone();
+ const time_point<absl::time_internal::cctz::seconds> in =
+ time_point<absl::time_internal::cctz::seconds>::max();
+ const std::string s = format(RFC3339_full, in, utc);
+ time_point<absl::time_internal::cctz::seconds> out;
+ EXPECT_TRUE(parse(RFC3339_full, s, utc, &out)) << s;
+ EXPECT_EQ(in, out);
+}
+
+TEST(FormatParse, RoundTripDistantPast) {
+ const time_zone utc = utc_time_zone();
+ const time_point<absl::time_internal::cctz::seconds> in =
+ time_point<absl::time_internal::cctz::seconds>::min();
+ const std::string s = format(RFC3339_full, in, utc);
+ time_point<absl::time_internal::cctz::seconds> out;
+ EXPECT_TRUE(parse(RFC3339_full, s, utc, &out)) << s;
+ EXPECT_EQ(in, out);
+}
+
+} // namespace cctz
+} // namespace time_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/time/internal/cctz/src/time_zone_if.cc b/third_party/abseil/src/absl/time/internal/cctz/src/time_zone_if.cc
new file mode 100644
index 0000000..0319b2f
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/src/time_zone_if.cc
@@ -0,0 +1,45 @@
+// Copyright 2016 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "time_zone_if.h"
+
+#include "absl/base/config.h"
+#include "time_zone_info.h"
+#include "time_zone_libc.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace time_internal {
+namespace cctz {
+
+std::unique_ptr<TimeZoneIf> TimeZoneIf::Load(const std::string& name) {
+ // Support "libc:localtime" and "libc:*" to access the legacy
+ // localtime and UTC support respectively from the C library.
+ if (name.compare(0, 5, "libc:") == 0) {
+ return std::unique_ptr<TimeZoneIf>(new TimeZoneLibC(name.substr(5)));
+ }
+
+ // Otherwise use the "zoneinfo" implementation by default.
+ std::unique_ptr<TimeZoneInfo> tz(new TimeZoneInfo);
+ if (!tz->Load(name)) tz.reset();
+ return std::unique_ptr<TimeZoneIf>(tz.release());
+}
+
+// Defined out-of-line to avoid emitting a weak vtable in all TUs.
+TimeZoneIf::~TimeZoneIf() {}
+
+} // namespace cctz
+} // namespace time_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/time/internal/cctz/src/time_zone_if.h b/third_party/abseil/src/absl/time/internal/cctz/src/time_zone_if.h
new file mode 100644
index 0000000..32c0891
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/src/time_zone_if.h
@@ -0,0 +1,76 @@
+// Copyright 2016 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_IF_H_
+#define ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_IF_H_
+
+#include <chrono>
+#include <cstdint>
+#include <memory>
+#include <string>
+
+#include "absl/base/config.h"
+#include "absl/time/internal/cctz/include/cctz/civil_time.h"
+#include "absl/time/internal/cctz/include/cctz/time_zone.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace time_internal {
+namespace cctz {
+
+// A simple interface used to hide time-zone complexities from time_zone::Impl.
+// Subclasses implement the functions for civil-time conversions in the zone.
+class TimeZoneIf {
+ public:
+ // A factory function for TimeZoneIf implementations.
+ static std::unique_ptr<TimeZoneIf> Load(const std::string& name);
+
+ virtual ~TimeZoneIf();
+
+ virtual time_zone::absolute_lookup BreakTime(
+ const time_point<seconds>& tp) const = 0;
+ virtual time_zone::civil_lookup MakeTime(const civil_second& cs) const = 0;
+
+ virtual bool NextTransition(const time_point<seconds>& tp,
+ time_zone::civil_transition* trans) const = 0;
+ virtual bool PrevTransition(const time_point<seconds>& tp,
+ time_zone::civil_transition* trans) const = 0;
+
+ virtual std::string Version() const = 0;
+ virtual std::string Description() const = 0;
+
+ protected:
+ TimeZoneIf() {}
+};
+
+// Convert between time_point<seconds> and a count of seconds since the
+// Unix epoch. We assume that the std::chrono::system_clock and the
+// Unix clock are second aligned, but not that they share an epoch.
+inline std::int_fast64_t ToUnixSeconds(const time_point<seconds>& tp) {
+ return (tp - std::chrono::time_point_cast<seconds>(
+ std::chrono::system_clock::from_time_t(0)))
+ .count();
+}
+inline time_point<seconds> FromUnixSeconds(std::int_fast64_t t) {
+ return std::chrono::time_point_cast<seconds>(
+ std::chrono::system_clock::from_time_t(0)) +
+ seconds(t);
+}
+
+} // namespace cctz
+} // namespace time_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_IF_H_
diff --git a/third_party/abseil/src/absl/time/internal/cctz/src/time_zone_impl.cc b/third_party/abseil/src/absl/time/internal/cctz/src/time_zone_impl.cc
new file mode 100644
index 0000000..f34e3ae
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/src/time_zone_impl.cc
@@ -0,0 +1,113 @@
+// Copyright 2016 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "time_zone_impl.h"
+
+#include <deque>
+#include <memory>
+#include <mutex>
+#include <string>
+#include <unordered_map>
+#include <utility>
+
+#include "absl/base/config.h"
+#include "time_zone_fixed.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace time_internal {
+namespace cctz {
+
+namespace {
+
+// time_zone::Impls are linked into a map to support fast lookup by name.
+using TimeZoneImplByName =
+ std::unordered_map<std::string, const time_zone::Impl*>;
+TimeZoneImplByName* time_zone_map = nullptr;
+
+// Mutual exclusion for time_zone_map.
+std::mutex& TimeZoneMutex() {
+ // This mutex is intentionally "leaked" to avoid the static deinitialization
+ // order fiasco (std::mutex's destructor is not trivial on many platforms).
+ static std::mutex* time_zone_mutex = new std::mutex;
+ return *time_zone_mutex;
+}
+
+} // namespace
+
+time_zone time_zone::Impl::UTC() { return time_zone(UTCImpl()); }
+
+bool time_zone::Impl::LoadTimeZone(const std::string& name, time_zone* tz) {
+ const Impl* const utc_impl = UTCImpl();
+
+ // Check for UTC (which is never a key in time_zone_map).
+ auto offset = seconds::zero();
+ if (FixedOffsetFromName(name, &offset) && offset == seconds::zero()) {
+ *tz = time_zone(utc_impl);
+ return true;
+ }
+
+ // Check whether the time zone has already been loaded.
+ {
+ std::lock_guard<std::mutex> lock(TimeZoneMutex());
+ if (time_zone_map != nullptr) {
+ TimeZoneImplByName::const_iterator itr = time_zone_map->find(name);
+ if (itr != time_zone_map->end()) {
+ *tz = time_zone(itr->second);
+ return itr->second != utc_impl;
+ }
+ }
+ }
+
+ // Load the new time zone (outside the lock).
+ std::unique_ptr<const Impl> new_impl(new Impl(name));
+
+ // Add the new time zone to the map.
+ std::lock_guard<std::mutex> lock(TimeZoneMutex());
+ if (time_zone_map == nullptr) time_zone_map = new TimeZoneImplByName;
+ const Impl*& impl = (*time_zone_map)[name];
+ if (impl == nullptr) { // this thread won any load race
+ impl = new_impl->zone_ ? new_impl.release() : utc_impl;
+ }
+ *tz = time_zone(impl);
+ return impl != utc_impl;
+}
+
+void time_zone::Impl::ClearTimeZoneMapTestOnly() {
+ std::lock_guard<std::mutex> lock(TimeZoneMutex());
+ if (time_zone_map != nullptr) {
+ // Existing time_zone::Impl* entries are in the wild, so we can't delete
+ // them. Instead, we move them to a private container, where they are
+ // logically unreachable but not "leaked". Future requests will result
+ // in reloading the data.
+ static auto* cleared = new std::deque<const time_zone::Impl*>;
+ for (const auto& element : *time_zone_map) {
+ cleared->push_back(element.second);
+ }
+ time_zone_map->clear();
+ }
+}
+
+time_zone::Impl::Impl(const std::string& name)
+ : name_(name), zone_(TimeZoneIf::Load(name_)) {}
+
+const time_zone::Impl* time_zone::Impl::UTCImpl() {
+ static const Impl* utc_impl = new Impl("UTC"); // never fails
+ return utc_impl;
+}
+
+} // namespace cctz
+} // namespace time_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/time/internal/cctz/src/time_zone_impl.h b/third_party/abseil/src/absl/time/internal/cctz/src/time_zone_impl.h
new file mode 100644
index 0000000..7d747ba
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/src/time_zone_impl.h
@@ -0,0 +1,93 @@
+// Copyright 2016 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_IMPL_H_
+#define ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_IMPL_H_
+
+#include <memory>
+#include <string>
+
+#include "absl/base/config.h"
+#include "absl/time/internal/cctz/include/cctz/civil_time.h"
+#include "absl/time/internal/cctz/include/cctz/time_zone.h"
+#include "time_zone_if.h"
+#include "time_zone_info.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace time_internal {
+namespace cctz {
+
+// time_zone::Impl is the internal object referenced by a cctz::time_zone.
+class time_zone::Impl {
+ public:
+ // The UTC time zone. Also used for other time zones that fail to load.
+ static time_zone UTC();
+
+ // Load a named time zone. Returns false if the name is invalid, or if
+ // some other kind of error occurs. Note that loading "UTC" never fails.
+ static bool LoadTimeZone(const std::string& name, time_zone* tz);
+
+ // Clears the map of cached time zones. Primarily for use in benchmarks
+ // that gauge the performance of loading/parsing the time-zone data.
+ static void ClearTimeZoneMapTestOnly();
+
+ // The primary key is the time-zone ID (e.g., "America/New_York").
+ const std::string& Name() const {
+ // TODO: It would nice if the zoneinfo data included the zone name.
+ return name_;
+ }
+
+ // Breaks a time_point down to civil-time components in this time zone.
+ time_zone::absolute_lookup BreakTime(const time_point<seconds>& tp) const {
+ return zone_->BreakTime(tp);
+ }
+
+ // Converts the civil-time components in this time zone into a time_point.
+ // That is, the opposite of BreakTime(). The requested civil time may be
+ // ambiguous or illegal due to a change of UTC offset.
+ time_zone::civil_lookup MakeTime(const civil_second& cs) const {
+ return zone_->MakeTime(cs);
+ }
+
+ // Finds the time of the next/previous offset change in this time zone.
+ bool NextTransition(const time_point<seconds>& tp,
+ time_zone::civil_transition* trans) const {
+ return zone_->NextTransition(tp, trans);
+ }
+ bool PrevTransition(const time_point<seconds>& tp,
+ time_zone::civil_transition* trans) const {
+ return zone_->PrevTransition(tp, trans);
+ }
+
+ // Returns an implementation-defined version string for this time zone.
+ std::string Version() const { return zone_->Version(); }
+
+ // Returns an implementation-defined description of this time zone.
+ std::string Description() const { return zone_->Description(); }
+
+ private:
+ explicit Impl(const std::string& name);
+ static const Impl* UTCImpl();
+
+ const std::string name_;
+ std::unique_ptr<TimeZoneIf> zone_;
+};
+
+} // namespace cctz
+} // namespace time_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_IMPL_H_
diff --git a/third_party/abseil/src/absl/time/internal/cctz/src/time_zone_info.cc b/third_party/abseil/src/absl/time/internal/cctz/src/time_zone_info.cc
new file mode 100644
index 0000000..8039353
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/src/time_zone_info.cc
@@ -0,0 +1,965 @@
+// Copyright 2016 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// This file implements the TimeZoneIf interface using the "zoneinfo"
+// data provided by the IANA Time Zone Database (i.e., the only real game
+// in town).
+//
+// TimeZoneInfo represents the history of UTC-offset changes within a time
+// zone. Most changes are due to daylight-saving rules, but occasionally
+// shifts are made to the time-zone's base offset. The database only attempts
+// to be definitive for times since 1970, so be wary of local-time conversions
+// before that. Also, rule and zone-boundary changes are made at the whim
+// of governments, so the conversion of future times needs to be taken with
+// a grain of salt.
+//
+// For more information see tzfile(5), http://www.iana.org/time-zones, or
+// https://en.wikipedia.org/wiki/Zoneinfo.
+//
+// Note that we assume the proleptic Gregorian calendar and 60-second
+// minutes throughout.
+
+#include "time_zone_info.h"
+
+#include <algorithm>
+#include <cassert>
+#include <chrono>
+#include <cstdint>
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+#include <functional>
+#include <memory>
+#include <sstream>
+#include <string>
+
+#include "absl/base/config.h"
+#include "absl/time/internal/cctz/include/cctz/civil_time.h"
+#include "time_zone_fixed.h"
+#include "time_zone_posix.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace time_internal {
+namespace cctz {
+
+namespace {
+
+inline bool IsLeap(year_t year) {
+ return (year % 4) == 0 && ((year % 100) != 0 || (year % 400) == 0);
+}
+
+// The number of days in non-leap and leap years respectively.
+const std::int_least32_t kDaysPerYear[2] = {365, 366};
+
+// The day offsets of the beginning of each (1-based) month in non-leap and
+// leap years respectively (e.g., 335 days before December in a leap year).
+const std::int_least16_t kMonthOffsets[2][1 + 12 + 1] = {
+ {-1, 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365},
+ {-1, 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366},
+};
+
+// We reject leap-second encoded zoneinfo and so assume 60-second minutes.
+const std::int_least32_t kSecsPerDay = 24 * 60 * 60;
+
+// 400-year chunks always have 146097 days (20871 weeks).
+const std::int_least64_t kSecsPer400Years = 146097LL * kSecsPerDay;
+
+// Like kDaysPerYear[] but scaled up by a factor of kSecsPerDay.
+const std::int_least32_t kSecsPerYear[2] = {
+ 365 * kSecsPerDay,
+ 366 * kSecsPerDay,
+};
+
+// Convert a cctz::weekday to a POSIX TZ weekday number (0==Sun, ..., 6=Sat).
+inline int ToPosixWeekday(weekday wd) {
+ switch (wd) {
+ case weekday::sunday:
+ return 0;
+ case weekday::monday:
+ return 1;
+ case weekday::tuesday:
+ return 2;
+ case weekday::wednesday:
+ return 3;
+ case weekday::thursday:
+ return 4;
+ case weekday::friday:
+ return 5;
+ case weekday::saturday:
+ return 6;
+ }
+ return 0; /*NOTREACHED*/
+}
+
+// Single-byte, unsigned numeric values are encoded directly.
+inline std::uint_fast8_t Decode8(const char* cp) {
+ return static_cast<std::uint_fast8_t>(*cp) & 0xff;
+}
+
+// Multi-byte, numeric values are encoded using a MSB first,
+// twos-complement representation. These helpers decode, from
+// the given address, 4-byte and 8-byte values respectively.
+// Note: If int_fastXX_t == intXX_t and this machine is not
+// twos complement, then there will be at least one input value
+// we cannot represent.
+std::int_fast32_t Decode32(const char* cp) {
+ std::uint_fast32_t v = 0;
+ for (int i = 0; i != (32 / 8); ++i) v = (v << 8) | Decode8(cp++);
+ const std::int_fast32_t s32max = 0x7fffffff;
+ const auto s32maxU = static_cast<std::uint_fast32_t>(s32max);
+ if (v <= s32maxU) return static_cast<std::int_fast32_t>(v);
+ return static_cast<std::int_fast32_t>(v - s32maxU - 1) - s32max - 1;
+}
+
+std::int_fast64_t Decode64(const char* cp) {
+ std::uint_fast64_t v = 0;
+ for (int i = 0; i != (64 / 8); ++i) v = (v << 8) | Decode8(cp++);
+ const std::int_fast64_t s64max = 0x7fffffffffffffff;
+ const auto s64maxU = static_cast<std::uint_fast64_t>(s64max);
+ if (v <= s64maxU) return static_cast<std::int_fast64_t>(v);
+ return static_cast<std::int_fast64_t>(v - s64maxU - 1) - s64max - 1;
+}
+
+// Generate a year-relative offset for a PosixTransition.
+std::int_fast64_t TransOffset(bool leap_year, int jan1_weekday,
+ const PosixTransition& pt) {
+ std::int_fast64_t days = 0;
+ switch (pt.date.fmt) {
+ case PosixTransition::J: {
+ days = pt.date.j.day;
+ if (!leap_year || days < kMonthOffsets[1][3]) days -= 1;
+ break;
+ }
+ case PosixTransition::N: {
+ days = pt.date.n.day;
+ break;
+ }
+ case PosixTransition::M: {
+ const bool last_week = (pt.date.m.week == 5);
+ days = kMonthOffsets[leap_year][pt.date.m.month + last_week];
+ const std::int_fast64_t weekday = (jan1_weekday + days) % 7;
+ if (last_week) {
+ days -= (weekday + 7 - 1 - pt.date.m.weekday) % 7 + 1;
+ } else {
+ days += (pt.date.m.weekday + 7 - weekday) % 7;
+ days += (pt.date.m.week - 1) * 7;
+ }
+ break;
+ }
+ }
+ return (days * kSecsPerDay) + pt.time.offset;
+}
+
+inline time_zone::civil_lookup MakeUnique(const time_point<seconds>& tp) {
+ time_zone::civil_lookup cl;
+ cl.kind = time_zone::civil_lookup::UNIQUE;
+ cl.pre = cl.trans = cl.post = tp;
+ return cl;
+}
+
+inline time_zone::civil_lookup MakeUnique(std::int_fast64_t unix_time) {
+ return MakeUnique(FromUnixSeconds(unix_time));
+}
+
+inline time_zone::civil_lookup MakeSkipped(const Transition& tr,
+ const civil_second& cs) {
+ time_zone::civil_lookup cl;
+ cl.kind = time_zone::civil_lookup::SKIPPED;
+ cl.pre = FromUnixSeconds(tr.unix_time - 1 + (cs - tr.prev_civil_sec));
+ cl.trans = FromUnixSeconds(tr.unix_time);
+ cl.post = FromUnixSeconds(tr.unix_time - (tr.civil_sec - cs));
+ return cl;
+}
+
+inline time_zone::civil_lookup MakeRepeated(const Transition& tr,
+ const civil_second& cs) {
+ time_zone::civil_lookup cl;
+ cl.kind = time_zone::civil_lookup::REPEATED;
+ cl.pre = FromUnixSeconds(tr.unix_time - 1 - (tr.prev_civil_sec - cs));
+ cl.trans = FromUnixSeconds(tr.unix_time);
+ cl.post = FromUnixSeconds(tr.unix_time + (cs - tr.civil_sec));
+ return cl;
+}
+
+inline civil_second YearShift(const civil_second& cs, year_t shift) {
+ return civil_second(cs.year() + shift, cs.month(), cs.day(), cs.hour(),
+ cs.minute(), cs.second());
+}
+
+} // namespace
+
+// What (no leap-seconds) UTC+seconds zoneinfo would look like.
+bool TimeZoneInfo::ResetToBuiltinUTC(const seconds& offset) {
+ transition_types_.resize(1);
+ TransitionType& tt(transition_types_.back());
+ tt.utc_offset = static_cast<std::int_least32_t>(offset.count());
+ tt.is_dst = false;
+ tt.abbr_index = 0;
+
+ // We temporarily add some redundant, contemporary (2015 through 2025)
+ // transitions for performance reasons. See TimeZoneInfo::LocalTime().
+ // TODO: Fix the performance issue and remove the extra transitions.
+ transitions_.clear();
+ transitions_.reserve(12);
+ for (const std::int_fast64_t unix_time : {
+ -(1LL << 59), // a "first half" transition
+ 1420070400LL, // 2015-01-01T00:00:00+00:00
+ 1451606400LL, // 2016-01-01T00:00:00+00:00
+ 1483228800LL, // 2017-01-01T00:00:00+00:00
+ 1514764800LL, // 2018-01-01T00:00:00+00:00
+ 1546300800LL, // 2019-01-01T00:00:00+00:00
+ 1577836800LL, // 2020-01-01T00:00:00+00:00
+ 1609459200LL, // 2021-01-01T00:00:00+00:00
+ 1640995200LL, // 2022-01-01T00:00:00+00:00
+ 1672531200LL, // 2023-01-01T00:00:00+00:00
+ 1704067200LL, // 2024-01-01T00:00:00+00:00
+ 1735689600LL, // 2025-01-01T00:00:00+00:00
+ }) {
+ Transition& tr(*transitions_.emplace(transitions_.end()));
+ tr.unix_time = unix_time;
+ tr.type_index = 0;
+ tr.civil_sec = LocalTime(tr.unix_time, tt).cs;
+ tr.prev_civil_sec = tr.civil_sec - 1;
+ }
+
+ default_transition_type_ = 0;
+ abbreviations_ = FixedOffsetToAbbr(offset);
+ abbreviations_.append(1, '\0');
+ future_spec_.clear(); // never needed for a fixed-offset zone
+ extended_ = false;
+
+ tt.civil_max = LocalTime(seconds::max().count(), tt).cs;
+ tt.civil_min = LocalTime(seconds::min().count(), tt).cs;
+
+ transitions_.shrink_to_fit();
+ return true;
+}
+
+// Builds the in-memory header using the raw bytes from the file.
+bool TimeZoneInfo::Header::Build(const tzhead& tzh) {
+ std::int_fast32_t v;
+ if ((v = Decode32(tzh.tzh_timecnt)) < 0) return false;
+ timecnt = static_cast<std::size_t>(v);
+ if ((v = Decode32(tzh.tzh_typecnt)) < 0) return false;
+ typecnt = static_cast<std::size_t>(v);
+ if ((v = Decode32(tzh.tzh_charcnt)) < 0) return false;
+ charcnt = static_cast<std::size_t>(v);
+ if ((v = Decode32(tzh.tzh_leapcnt)) < 0) return false;
+ leapcnt = static_cast<std::size_t>(v);
+ if ((v = Decode32(tzh.tzh_ttisstdcnt)) < 0) return false;
+ ttisstdcnt = static_cast<std::size_t>(v);
+ if ((v = Decode32(tzh.tzh_ttisutcnt)) < 0) return false;
+ ttisutcnt = static_cast<std::size_t>(v);
+ return true;
+}
+
+// How many bytes of data are associated with this header. The result
+// depends upon whether this is a section with 4-byte or 8-byte times.
+std::size_t TimeZoneInfo::Header::DataLength(std::size_t time_len) const {
+ std::size_t len = 0;
+ len += (time_len + 1) * timecnt; // unix_time + type_index
+ len += (4 + 1 + 1) * typecnt; // utc_offset + is_dst + abbr_index
+ len += 1 * charcnt; // abbreviations
+ len += (time_len + 4) * leapcnt; // leap-time + TAI-UTC
+ len += 1 * ttisstdcnt; // UTC/local indicators
+ len += 1 * ttisutcnt; // standard/wall indicators
+ return len;
+}
+
+// zic(8) can generate no-op transitions when a zone changes rules at an
+// instant when there is actually no discontinuity. So we check whether
+// two transitions have equivalent types (same offset/is_dst/abbr).
+bool TimeZoneInfo::EquivTransitions(std::uint_fast8_t tt1_index,
+ std::uint_fast8_t tt2_index) const {
+ if (tt1_index == tt2_index) return true;
+ const TransitionType& tt1(transition_types_[tt1_index]);
+ const TransitionType& tt2(transition_types_[tt2_index]);
+ if (tt1.utc_offset != tt2.utc_offset) return false;
+ if (tt1.is_dst != tt2.is_dst) return false;
+ if (tt1.abbr_index != tt2.abbr_index) return false;
+ return true;
+}
+
+// Find/make a transition type with these attributes.
+bool TimeZoneInfo::GetTransitionType(std::int_fast32_t utc_offset, bool is_dst,
+ const std::string& abbr,
+ std::uint_least8_t* index) {
+ std::size_t type_index = 0;
+ std::size_t abbr_index = abbreviations_.size();
+ for (; type_index != transition_types_.size(); ++type_index) {
+ const TransitionType& tt(transition_types_[type_index]);
+ const char* tt_abbr = &abbreviations_[tt.abbr_index];
+ if (tt_abbr == abbr) abbr_index = tt.abbr_index;
+ if (tt.utc_offset == utc_offset && tt.is_dst == is_dst) {
+ if (abbr_index == tt.abbr_index) break; // reuse
+ }
+ }
+ if (type_index > 255 || abbr_index > 255) {
+ // No index space (8 bits) available for a new type or abbreviation.
+ return false;
+ }
+ if (type_index == transition_types_.size()) {
+ TransitionType& tt(*transition_types_.emplace(transition_types_.end()));
+ tt.utc_offset = static_cast<std::int_least32_t>(utc_offset);
+ tt.is_dst = is_dst;
+ if (abbr_index == abbreviations_.size()) {
+ abbreviations_.append(abbr);
+ abbreviations_.append(1, '\0');
+ }
+ tt.abbr_index = static_cast<std::uint_least8_t>(abbr_index);
+ }
+ *index = static_cast<std::uint_least8_t>(type_index);
+ return true;
+}
+
+// Use the POSIX-TZ-environment-variable-style string to handle times
+// in years after the last transition stored in the zoneinfo data.
+bool TimeZoneInfo::ExtendTransitions() {
+ extended_ = false;
+ if (future_spec_.empty()) return true; // last transition prevails
+
+ PosixTimeZone posix;
+ if (!ParsePosixSpec(future_spec_, &posix)) return false;
+
+ // Find transition type for the future std specification.
+ std::uint_least8_t std_ti;
+ if (!GetTransitionType(posix.std_offset, false, posix.std_abbr, &std_ti))
+ return false;
+
+ if (posix.dst_abbr.empty()) { // std only
+ // The future specification should match the last transition, and
+ // that means that handling the future will fall out naturally.
+ return EquivTransitions(transitions_.back().type_index, std_ti);
+ }
+
+ // Find transition type for the future dst specification.
+ std::uint_least8_t dst_ti;
+ if (!GetTransitionType(posix.dst_offset, true, posix.dst_abbr, &dst_ti))
+ return false;
+
+ // Extend the transitions for an additional 400 years using the
+ // future specification. Years beyond those can be handled by
+ // mapping back to a cycle-equivalent year within that range.
+ // We may need two additional transitions for the current year.
+ transitions_.reserve(transitions_.size() + 400 * 2 + 2);
+ extended_ = true;
+
+ const Transition& last(transitions_.back());
+ const std::int_fast64_t last_time = last.unix_time;
+ const TransitionType& last_tt(transition_types_[last.type_index]);
+ last_year_ = LocalTime(last_time, last_tt).cs.year();
+ bool leap_year = IsLeap(last_year_);
+ const civil_second jan1(last_year_);
+ std::int_fast64_t jan1_time = jan1 - civil_second();
+ int jan1_weekday = ToPosixWeekday(get_weekday(jan1));
+
+ Transition dst = {0, dst_ti, civil_second(), civil_second()};
+ Transition std = {0, std_ti, civil_second(), civil_second()};
+ for (const year_t limit = last_year_ + 400;; ++last_year_) {
+ auto dst_trans_off = TransOffset(leap_year, jan1_weekday, posix.dst_start);
+ auto std_trans_off = TransOffset(leap_year, jan1_weekday, posix.dst_end);
+ dst.unix_time = jan1_time + dst_trans_off - posix.std_offset;
+ std.unix_time = jan1_time + std_trans_off - posix.dst_offset;
+ const auto* ta = dst.unix_time < std.unix_time ? &dst : &std;
+ const auto* tb = dst.unix_time < std.unix_time ? &std : &dst;
+ if (last_time < tb->unix_time) {
+ if (last_time < ta->unix_time) transitions_.push_back(*ta);
+ transitions_.push_back(*tb);
+ }
+ if (last_year_ == limit) break;
+ jan1_time += kSecsPerYear[leap_year];
+ jan1_weekday = (jan1_weekday + kDaysPerYear[leap_year]) % 7;
+ leap_year = !leap_year && IsLeap(last_year_ + 1);
+ }
+
+ return true;
+}
+
+bool TimeZoneInfo::Load(ZoneInfoSource* zip) {
+ // Read and validate the header.
+ tzhead tzh;
+ if (zip->Read(&tzh, sizeof(tzh)) != sizeof(tzh)) return false;
+ if (strncmp(tzh.tzh_magic, TZ_MAGIC, sizeof(tzh.tzh_magic)) != 0)
+ return false;
+ Header hdr;
+ if (!hdr.Build(tzh)) return false;
+ std::size_t time_len = 4;
+ if (tzh.tzh_version[0] != '\0') {
+ // Skip the 4-byte data.
+ if (zip->Skip(hdr.DataLength(time_len)) != 0) return false;
+ // Read and validate the header for the 8-byte data.
+ if (zip->Read(&tzh, sizeof(tzh)) != sizeof(tzh)) return false;
+ if (strncmp(tzh.tzh_magic, TZ_MAGIC, sizeof(tzh.tzh_magic)) != 0)
+ return false;
+ if (tzh.tzh_version[0] == '\0') return false;
+ if (!hdr.Build(tzh)) return false;
+ time_len = 8;
+ }
+ if (hdr.typecnt == 0) return false;
+ if (hdr.leapcnt != 0) {
+ // This code assumes 60-second minutes so we do not want
+ // the leap-second encoded zoneinfo. We could reverse the
+ // compensation, but the "right" encoding is rarely used
+ // so currently we simply reject such data.
+ return false;
+ }
+ if (hdr.ttisstdcnt != 0 && hdr.ttisstdcnt != hdr.typecnt) return false;
+ if (hdr.ttisutcnt != 0 && hdr.ttisutcnt != hdr.typecnt) return false;
+
+ // Read the data into a local buffer.
+ std::size_t len = hdr.DataLength(time_len);
+ std::vector<char> tbuf(len);
+ if (zip->Read(tbuf.data(), len) != len) return false;
+ const char* bp = tbuf.data();
+
+ // Decode and validate the transitions.
+ transitions_.reserve(hdr.timecnt + 2);
+ transitions_.resize(hdr.timecnt);
+ for (std::size_t i = 0; i != hdr.timecnt; ++i) {
+ transitions_[i].unix_time = (time_len == 4) ? Decode32(bp) : Decode64(bp);
+ bp += time_len;
+ if (i != 0) {
+ // Check that the transitions are ordered by time (as zic guarantees).
+ if (!Transition::ByUnixTime()(transitions_[i - 1], transitions_[i]))
+ return false; // out of order
+ }
+ }
+ bool seen_type_0 = false;
+ for (std::size_t i = 0; i != hdr.timecnt; ++i) {
+ transitions_[i].type_index = Decode8(bp++);
+ if (transitions_[i].type_index >= hdr.typecnt) return false;
+ if (transitions_[i].type_index == 0) seen_type_0 = true;
+ }
+
+ // Decode and validate the transition types.
+ transition_types_.reserve(hdr.typecnt + 2);
+ transition_types_.resize(hdr.typecnt);
+ for (std::size_t i = 0; i != hdr.typecnt; ++i) {
+ transition_types_[i].utc_offset =
+ static_cast<std::int_least32_t>(Decode32(bp));
+ if (transition_types_[i].utc_offset >= kSecsPerDay ||
+ transition_types_[i].utc_offset <= -kSecsPerDay)
+ return false;
+ bp += 4;
+ transition_types_[i].is_dst = (Decode8(bp++) != 0);
+ transition_types_[i].abbr_index = Decode8(bp++);
+ if (transition_types_[i].abbr_index >= hdr.charcnt) return false;
+ }
+
+ // Determine the before-first-transition type.
+ default_transition_type_ = 0;
+ if (seen_type_0 && hdr.timecnt != 0) {
+ std::uint_fast8_t index = 0;
+ if (transition_types_[0].is_dst) {
+ index = transitions_[0].type_index;
+ while (index != 0 && transition_types_[index].is_dst) --index;
+ }
+ while (index != hdr.typecnt && transition_types_[index].is_dst) ++index;
+ if (index != hdr.typecnt) default_transition_type_ = index;
+ }
+
+ // Copy all the abbreviations.
+ abbreviations_.reserve(hdr.charcnt + 10);
+ abbreviations_.assign(bp, hdr.charcnt);
+ bp += hdr.charcnt;
+
+ // Skip the unused portions. We've already dispensed with leap-second
+ // encoded zoneinfo. The ttisstd/ttisgmt indicators only apply when
+ // interpreting a POSIX spec that does not include start/end rules, and
+ // that isn't the case here (see "zic -p").
+ bp += (8 + 4) * hdr.leapcnt; // leap-time + TAI-UTC
+ bp += 1 * hdr.ttisstdcnt; // UTC/local indicators
+ bp += 1 * hdr.ttisutcnt; // standard/wall indicators
+ assert(bp == tbuf.data() + tbuf.size());
+
+ future_spec_.clear();
+ if (tzh.tzh_version[0] != '\0') {
+ // Snarf up the NL-enclosed future POSIX spec. Note
+ // that version '3' files utilize an extended format.
+ auto get_char = [](ZoneInfoSource* azip) -> int {
+ unsigned char ch; // all non-EOF results are positive
+ return (azip->Read(&ch, 1) == 1) ? ch : EOF;
+ };
+ if (get_char(zip) != '\n') return false;
+ for (int c = get_char(zip); c != '\n'; c = get_char(zip)) {
+ if (c == EOF) return false;
+ future_spec_.push_back(static_cast<char>(c));
+ }
+ }
+
+ // We don't check for EOF so that we're forwards compatible.
+
+ // If we did not find version information during the standard loading
+ // process (as of tzh_version '3' that is unsupported), then ask the
+ // ZoneInfoSource for any out-of-bound version string it may be privy to.
+ if (version_.empty()) {
+ version_ = zip->Version();
+ }
+
+ // Trim redundant transitions. zic may have added these to work around
+ // differences between the glibc and reference implementations (see
+ // zic.c:dontmerge) and the Qt library (see zic.c:WORK_AROUND_QTBUG_53071).
+ // For us, they just get in the way when we do future_spec_ extension.
+ while (hdr.timecnt > 1) {
+ if (!EquivTransitions(transitions_[hdr.timecnt - 1].type_index,
+ transitions_[hdr.timecnt - 2].type_index)) {
+ break;
+ }
+ hdr.timecnt -= 1;
+ }
+ transitions_.resize(hdr.timecnt);
+
+ // Ensure that there is always a transition in the first half of the
+ // time line (the second half is handled below) so that the signed
+ // difference between a civil_second and the civil_second of its
+ // previous transition is always representable, without overflow.
+ if (transitions_.empty() || transitions_.front().unix_time >= 0) {
+ Transition& tr(*transitions_.emplace(transitions_.begin()));
+ tr.unix_time = -(1LL << 59); // -18267312070-10-26T17:01:52+00:00
+ tr.type_index = default_transition_type_;
+ }
+
+ // Extend the transitions using the future specification.
+ if (!ExtendTransitions()) return false;
+
+ // Ensure that there is always a transition in the second half of the
+ // time line (the first half is handled above) so that the signed
+ // difference between a civil_second and the civil_second of its
+ // previous transition is always representable, without overflow.
+ const Transition& last(transitions_.back());
+ if (last.unix_time < 0) {
+ const std::uint_fast8_t type_index = last.type_index;
+ Transition& tr(*transitions_.emplace(transitions_.end()));
+ tr.unix_time = 2147483647; // 2038-01-19T03:14:07+00:00
+ tr.type_index = type_index;
+ }
+
+ // Compute the local civil time for each transition and the preceding
+ // second. These will be used for reverse conversions in MakeTime().
+ const TransitionType* ttp = &transition_types_[default_transition_type_];
+ for (std::size_t i = 0; i != transitions_.size(); ++i) {
+ Transition& tr(transitions_[i]);
+ tr.prev_civil_sec = LocalTime(tr.unix_time, *ttp).cs - 1;
+ ttp = &transition_types_[tr.type_index];
+ tr.civil_sec = LocalTime(tr.unix_time, *ttp).cs;
+ if (i != 0) {
+ // Check that the transitions are ordered by civil time. Essentially
+ // this means that an offset change cannot cross another such change.
+ // No one does this in practice, and we depend on it in MakeTime().
+ if (!Transition::ByCivilTime()(transitions_[i - 1], tr))
+ return false; // out of order
+ }
+ }
+
+ // Compute the maximum/minimum civil times that can be converted to a
+ // time_point<seconds> for each of the zone's transition types.
+ for (auto& tt : transition_types_) {
+ tt.civil_max = LocalTime(seconds::max().count(), tt).cs;
+ tt.civil_min = LocalTime(seconds::min().count(), tt).cs;
+ }
+
+ transitions_.shrink_to_fit();
+ return true;
+}
+
+namespace {
+
+// fopen(3) adaptor.
+inline FILE* FOpen(const char* path, const char* mode) {
+#if defined(_MSC_VER)
+ FILE* fp;
+ if (fopen_s(&fp, path, mode) != 0) fp = nullptr;
+ return fp;
+#else
+ return fopen(path, mode); // TODO: Enable the close-on-exec flag.
+#endif
+}
+
+// A stdio(3)-backed implementation of ZoneInfoSource.
+class FileZoneInfoSource : public ZoneInfoSource {
+ public:
+ static std::unique_ptr<ZoneInfoSource> Open(const std::string& name);
+
+ std::size_t Read(void* ptr, std::size_t size) override {
+ size = std::min(size, len_);
+ std::size_t nread = fread(ptr, 1, size, fp_.get());
+ len_ -= nread;
+ return nread;
+ }
+ int Skip(std::size_t offset) override {
+ offset = std::min(offset, len_);
+ int rc = fseek(fp_.get(), static_cast<long>(offset), SEEK_CUR);
+ if (rc == 0) len_ -= offset;
+ return rc;
+ }
+ std::string Version() const override {
+ // TODO: It would nice if the zoneinfo data included the tzdb version.
+ return std::string();
+ }
+
+ protected:
+ explicit FileZoneInfoSource(
+ FILE* fp, std::size_t len = std::numeric_limits<std::size_t>::max())
+ : fp_(fp, fclose), len_(len) {}
+
+ private:
+ std::unique_ptr<FILE, int (*)(FILE*)> fp_;
+ std::size_t len_;
+};
+
+std::unique_ptr<ZoneInfoSource> FileZoneInfoSource::Open(
+ const std::string& name) {
+ // Use of the "file:" prefix is intended for testing purposes only.
+ const std::size_t pos = (name.compare(0, 5, "file:") == 0) ? 5 : 0;
+
+ // Map the time-zone name to a path name.
+ std::string path;
+ if (pos == name.size() || name[pos] != '/') {
+ const char* tzdir = "/usr/share/zoneinfo";
+ char* tzdir_env = nullptr;
+#if defined(_MSC_VER)
+ _dupenv_s(&tzdir_env, nullptr, "TZDIR");
+#else
+ tzdir_env = std::getenv("TZDIR");
+#endif
+ if (tzdir_env && *tzdir_env) tzdir = tzdir_env;
+ path += tzdir;
+ path += '/';
+#if defined(_MSC_VER)
+ free(tzdir_env);
+#endif
+ }
+ path.append(name, pos, std::string::npos);
+
+ // Open the zoneinfo file.
+ FILE* fp = FOpen(path.c_str(), "rb");
+ if (fp == nullptr) return nullptr;
+ std::size_t length = 0;
+ if (fseek(fp, 0, SEEK_END) == 0) {
+ long offset = ftell(fp);
+ if (offset >= 0) {
+ length = static_cast<std::size_t>(offset);
+ }
+ rewind(fp);
+ }
+ return std::unique_ptr<ZoneInfoSource>(new FileZoneInfoSource(fp, length));
+}
+
+class AndroidZoneInfoSource : public FileZoneInfoSource {
+ public:
+ static std::unique_ptr<ZoneInfoSource> Open(const std::string& name);
+ std::string Version() const override { return version_; }
+
+ private:
+ explicit AndroidZoneInfoSource(FILE* fp, std::size_t len, const char* vers)
+ : FileZoneInfoSource(fp, len), version_(vers) {}
+ std::string version_;
+};
+
+std::unique_ptr<ZoneInfoSource> AndroidZoneInfoSource::Open(
+ const std::string& name) {
+ // Use of the "file:" prefix is intended for testing purposes only.
+ const std::size_t pos = (name.compare(0, 5, "file:") == 0) ? 5 : 0;
+
+ // See Android's libc/tzcode/bionic.cpp for additional information.
+ for (const char* tzdata : {"/data/misc/zoneinfo/current/tzdata",
+ "/system/usr/share/zoneinfo/tzdata"}) {
+ std::unique_ptr<FILE, int (*)(FILE*)> fp(FOpen(tzdata, "rb"), fclose);
+ if (fp.get() == nullptr) continue;
+
+ char hbuf[24]; // covers header.zonetab_offset too
+ if (fread(hbuf, 1, sizeof(hbuf), fp.get()) != sizeof(hbuf)) continue;
+ if (strncmp(hbuf, "tzdata", 6) != 0) continue;
+ const char* vers = (hbuf[11] == '\0') ? hbuf + 6 : "";
+ const std::int_fast32_t index_offset = Decode32(hbuf + 12);
+ const std::int_fast32_t data_offset = Decode32(hbuf + 16);
+ if (index_offset < 0 || data_offset < index_offset) continue;
+ if (fseek(fp.get(), static_cast<long>(index_offset), SEEK_SET) != 0)
+ continue;
+
+ char ebuf[52]; // covers entry.unused too
+ const std::size_t index_size =
+ static_cast<std::size_t>(data_offset - index_offset);
+ const std::size_t zonecnt = index_size / sizeof(ebuf);
+ if (zonecnt * sizeof(ebuf) != index_size) continue;
+ for (std::size_t i = 0; i != zonecnt; ++i) {
+ if (fread(ebuf, 1, sizeof(ebuf), fp.get()) != sizeof(ebuf)) break;
+ const std::int_fast32_t start = data_offset + Decode32(ebuf + 40);
+ const std::int_fast32_t length = Decode32(ebuf + 44);
+ if (start < 0 || length < 0) break;
+ ebuf[40] = '\0'; // ensure zone name is NUL terminated
+ if (strcmp(name.c_str() + pos, ebuf) == 0) {
+ if (fseek(fp.get(), static_cast<long>(start), SEEK_SET) != 0) break;
+ return std::unique_ptr<ZoneInfoSource>(new AndroidZoneInfoSource(
+ fp.release(), static_cast<std::size_t>(length), vers));
+ }
+ }
+ }
+
+ return nullptr;
+}
+
+} // namespace
+
+bool TimeZoneInfo::Load(const std::string& name) {
+ // We can ensure that the loading of UTC or any other fixed-offset
+ // zone never fails because the simple, fixed-offset state can be
+ // internally generated. Note that this depends on our choice to not
+ // accept leap-second encoded ("right") zoneinfo.
+ auto offset = seconds::zero();
+ if (FixedOffsetFromName(name, &offset)) {
+ return ResetToBuiltinUTC(offset);
+ }
+
+ // Find and use a ZoneInfoSource to load the named zone.
+ auto zip = cctz_extension::zone_info_source_factory(
+ name, [](const std::string& n) -> std::unique_ptr<ZoneInfoSource> {
+ if (auto z = FileZoneInfoSource::Open(n)) return z;
+ if (auto z = AndroidZoneInfoSource::Open(n)) return z;
+ return nullptr;
+ });
+ return zip != nullptr && Load(zip.get());
+}
+
+// BreakTime() translation for a particular transition type.
+time_zone::absolute_lookup TimeZoneInfo::LocalTime(
+ std::int_fast64_t unix_time, const TransitionType& tt) const {
+ // A civil time in "+offset" looks like (time+offset) in UTC.
+ // Note: We perform two additions in the civil_second domain to
+ // sidestep the chance of overflow in (unix_time + tt.utc_offset).
+ return {(civil_second() + unix_time) + tt.utc_offset, tt.utc_offset,
+ tt.is_dst, &abbreviations_[tt.abbr_index]};
+}
+
+// BreakTime() translation for a particular transition.
+time_zone::absolute_lookup TimeZoneInfo::LocalTime(std::int_fast64_t unix_time,
+ const Transition& tr) const {
+ const TransitionType& tt = transition_types_[tr.type_index];
+ // Note: (unix_time - tr.unix_time) will never overflow as we
+ // have ensured that there is always a "nearby" transition.
+ return {tr.civil_sec + (unix_time - tr.unix_time), // TODO: Optimize.
+ tt.utc_offset, tt.is_dst, &abbreviations_[tt.abbr_index]};
+}
+
+// MakeTime() translation with a conversion-preserving +N * 400-year shift.
+time_zone::civil_lookup TimeZoneInfo::TimeLocal(const civil_second& cs,
+ year_t c4_shift) const {
+ assert(last_year_ - 400 < cs.year() && cs.year() <= last_year_);
+ time_zone::civil_lookup cl = MakeTime(cs);
+ if (c4_shift > seconds::max().count() / kSecsPer400Years) {
+ cl.pre = cl.trans = cl.post = time_point<seconds>::max();
+ } else {
+ const auto offset = seconds(c4_shift * kSecsPer400Years);
+ const auto limit = time_point<seconds>::max() - offset;
+ for (auto* tp : {&cl.pre, &cl.trans, &cl.post}) {
+ if (*tp > limit) {
+ *tp = time_point<seconds>::max();
+ } else {
+ *tp += offset;
+ }
+ }
+ }
+ return cl;
+}
+
+time_zone::absolute_lookup TimeZoneInfo::BreakTime(
+ const time_point<seconds>& tp) const {
+ std::int_fast64_t unix_time = ToUnixSeconds(tp);
+ const std::size_t timecnt = transitions_.size();
+ assert(timecnt != 0); // We always add a transition.
+
+ if (unix_time < transitions_[0].unix_time) {
+ return LocalTime(unix_time, transition_types_[default_transition_type_]);
+ }
+ if (unix_time >= transitions_[timecnt - 1].unix_time) {
+ // After the last transition. If we extended the transitions using
+ // future_spec_, shift back to a supported year using the 400-year
+ // cycle of calendaric equivalence and then compensate accordingly.
+ if (extended_) {
+ const std::int_fast64_t diff =
+ unix_time - transitions_[timecnt - 1].unix_time;
+ const year_t shift = diff / kSecsPer400Years + 1;
+ const auto d = seconds(shift * kSecsPer400Years);
+ time_zone::absolute_lookup al = BreakTime(tp - d);
+ al.cs = YearShift(al.cs, shift * 400);
+ return al;
+ }
+ return LocalTime(unix_time, transitions_[timecnt - 1]);
+ }
+
+ const std::size_t hint = local_time_hint_.load(std::memory_order_relaxed);
+ if (0 < hint && hint < timecnt) {
+ if (transitions_[hint - 1].unix_time <= unix_time) {
+ if (unix_time < transitions_[hint].unix_time) {
+ return LocalTime(unix_time, transitions_[hint - 1]);
+ }
+ }
+ }
+
+ const Transition target = {unix_time, 0, civil_second(), civil_second()};
+ const Transition* begin = &transitions_[0];
+ const Transition* tr = std::upper_bound(begin, begin + timecnt, target,
+ Transition::ByUnixTime());
+ local_time_hint_.store(static_cast<std::size_t>(tr - begin),
+ std::memory_order_relaxed);
+ return LocalTime(unix_time, *--tr);
+}
+
+time_zone::civil_lookup TimeZoneInfo::MakeTime(const civil_second& cs) const {
+ const std::size_t timecnt = transitions_.size();
+ assert(timecnt != 0); // We always add a transition.
+
+ // Find the first transition after our target civil time.
+ const Transition* tr = nullptr;
+ const Transition* begin = &transitions_[0];
+ const Transition* end = begin + timecnt;
+ if (cs < begin->civil_sec) {
+ tr = begin;
+ } else if (cs >= transitions_[timecnt - 1].civil_sec) {
+ tr = end;
+ } else {
+ const std::size_t hint = time_local_hint_.load(std::memory_order_relaxed);
+ if (0 < hint && hint < timecnt) {
+ if (transitions_[hint - 1].civil_sec <= cs) {
+ if (cs < transitions_[hint].civil_sec) {
+ tr = begin + hint;
+ }
+ }
+ }
+ if (tr == nullptr) {
+ const Transition target = {0, 0, cs, civil_second()};
+ tr = std::upper_bound(begin, end, target, Transition::ByCivilTime());
+ time_local_hint_.store(static_cast<std::size_t>(tr - begin),
+ std::memory_order_relaxed);
+ }
+ }
+
+ if (tr == begin) {
+ if (tr->prev_civil_sec >= cs) {
+ // Before first transition, so use the default offset.
+ const TransitionType& tt(transition_types_[default_transition_type_]);
+ if (cs < tt.civil_min) return MakeUnique(time_point<seconds>::min());
+ return MakeUnique(cs - (civil_second() + tt.utc_offset));
+ }
+ // tr->prev_civil_sec < cs < tr->civil_sec
+ return MakeSkipped(*tr, cs);
+ }
+
+ if (tr == end) {
+ if (cs > (--tr)->prev_civil_sec) {
+ // After the last transition. If we extended the transitions using
+ // future_spec_, shift back to a supported year using the 400-year
+ // cycle of calendaric equivalence and then compensate accordingly.
+ if (extended_ && cs.year() > last_year_) {
+ const year_t shift = (cs.year() - last_year_ - 1) / 400 + 1;
+ return TimeLocal(YearShift(cs, shift * -400), shift);
+ }
+ const TransitionType& tt(transition_types_[tr->type_index]);
+ if (cs > tt.civil_max) return MakeUnique(time_point<seconds>::max());
+ return MakeUnique(tr->unix_time + (cs - tr->civil_sec));
+ }
+ // tr->civil_sec <= cs <= tr->prev_civil_sec
+ return MakeRepeated(*tr, cs);
+ }
+
+ if (tr->prev_civil_sec < cs) {
+ // tr->prev_civil_sec < cs < tr->civil_sec
+ return MakeSkipped(*tr, cs);
+ }
+
+ if (cs <= (--tr)->prev_civil_sec) {
+ // tr->civil_sec <= cs <= tr->prev_civil_sec
+ return MakeRepeated(*tr, cs);
+ }
+
+ // In between transitions.
+ return MakeUnique(tr->unix_time + (cs - tr->civil_sec));
+}
+
+std::string TimeZoneInfo::Version() const { return version_; }
+
+std::string TimeZoneInfo::Description() const {
+ std::ostringstream oss;
+ oss << "#trans=" << transitions_.size();
+ oss << " #types=" << transition_types_.size();
+ oss << " spec='" << future_spec_ << "'";
+ return oss.str();
+}
+
+bool TimeZoneInfo::NextTransition(const time_point<seconds>& tp,
+ time_zone::civil_transition* trans) const {
+ if (transitions_.empty()) return false;
+ const Transition* begin = &transitions_[0];
+ const Transition* end = begin + transitions_.size();
+ if (begin->unix_time <= -(1LL << 59)) {
+ // Do not report the BIG_BANG found in some zoneinfo data as it is
+ // really a sentinel, not a transition. See pre-2018f tz/zic.c.
+ ++begin;
+ }
+ std::int_fast64_t unix_time = ToUnixSeconds(tp);
+ const Transition target = {unix_time, 0, civil_second(), civil_second()};
+ const Transition* tr =
+ std::upper_bound(begin, end, target, Transition::ByUnixTime());
+ for (; tr != end; ++tr) { // skip no-op transitions
+ std::uint_fast8_t prev_type_index =
+ (tr == begin) ? default_transition_type_ : tr[-1].type_index;
+ if (!EquivTransitions(prev_type_index, tr[0].type_index)) break;
+ }
+ // When tr == end we return false, ignoring future_spec_.
+ if (tr == end) return false;
+ trans->from = tr->prev_civil_sec + 1;
+ trans->to = tr->civil_sec;
+ return true;
+}
+
+bool TimeZoneInfo::PrevTransition(const time_point<seconds>& tp,
+ time_zone::civil_transition* trans) const {
+ if (transitions_.empty()) return false;
+ const Transition* begin = &transitions_[0];
+ const Transition* end = begin + transitions_.size();
+ if (begin->unix_time <= -(1LL << 59)) {
+ // Do not report the BIG_BANG found in some zoneinfo data as it is
+ // really a sentinel, not a transition. See pre-2018f tz/zic.c.
+ ++begin;
+ }
+ std::int_fast64_t unix_time = ToUnixSeconds(tp);
+ if (FromUnixSeconds(unix_time) != tp) {
+ if (unix_time == std::numeric_limits<std::int_fast64_t>::max()) {
+ if (end == begin) return false; // Ignore future_spec_.
+ trans->from = (--end)->prev_civil_sec + 1;
+ trans->to = end->civil_sec;
+ return true;
+ }
+ unix_time += 1; // ceils
+ }
+ const Transition target = {unix_time, 0, civil_second(), civil_second()};
+ const Transition* tr =
+ std::lower_bound(begin, end, target, Transition::ByUnixTime());
+ for (; tr != begin; --tr) { // skip no-op transitions
+ std::uint_fast8_t prev_type_index =
+ (tr - 1 == begin) ? default_transition_type_ : tr[-2].type_index;
+ if (!EquivTransitions(prev_type_index, tr[-1].type_index)) break;
+ }
+ // When tr == end we return the "last" transition, ignoring future_spec_.
+ if (tr == begin) return false;
+ trans->from = (--tr)->prev_civil_sec + 1;
+ trans->to = tr->civil_sec;
+ return true;
+}
+
+} // namespace cctz
+} // namespace time_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/time/internal/cctz/src/time_zone_info.h b/third_party/abseil/src/absl/time/internal/cctz/src/time_zone_info.h
new file mode 100644
index 0000000..2467ff5
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/src/time_zone_info.h
@@ -0,0 +1,137 @@
+// Copyright 2016 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_INFO_H_
+#define ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_INFO_H_
+
+#include <atomic>
+#include <cstddef>
+#include <cstdint>
+#include <string>
+#include <vector>
+
+#include "absl/base/config.h"
+#include "absl/time/internal/cctz/include/cctz/civil_time.h"
+#include "absl/time/internal/cctz/include/cctz/time_zone.h"
+#include "absl/time/internal/cctz/include/cctz/zone_info_source.h"
+#include "time_zone_if.h"
+#include "tzfile.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace time_internal {
+namespace cctz {
+
+// A transition to a new UTC offset.
+struct Transition {
+ std::int_least64_t unix_time; // the instant of this transition
+ std::uint_least8_t type_index; // index of the transition type
+ civil_second civil_sec; // local civil time of transition
+ civil_second prev_civil_sec; // local civil time one second earlier
+
+ struct ByUnixTime {
+ inline bool operator()(const Transition& lhs, const Transition& rhs) const {
+ return lhs.unix_time < rhs.unix_time;
+ }
+ };
+ struct ByCivilTime {
+ inline bool operator()(const Transition& lhs, const Transition& rhs) const {
+ return lhs.civil_sec < rhs.civil_sec;
+ }
+ };
+};
+
+// The characteristics of a particular transition.
+struct TransitionType {
+ std::int_least32_t utc_offset; // the new prevailing UTC offset
+ civil_second civil_max; // max convertible civil time for offset
+ civil_second civil_min; // min convertible civil time for offset
+ bool is_dst; // did we move into daylight-saving time
+ std::uint_least8_t abbr_index; // index of the new abbreviation
+};
+
+// A time zone backed by the IANA Time Zone Database (zoneinfo).
+class TimeZoneInfo : public TimeZoneIf {
+ public:
+ TimeZoneInfo() = default;
+ TimeZoneInfo(const TimeZoneInfo&) = delete;
+ TimeZoneInfo& operator=(const TimeZoneInfo&) = delete;
+
+ // Loads the zoneinfo for the given name, returning true if successful.
+ bool Load(const std::string& name);
+
+ // TimeZoneIf implementations.
+ time_zone::absolute_lookup BreakTime(
+ const time_point<seconds>& tp) const override;
+ time_zone::civil_lookup MakeTime(const civil_second& cs) const override;
+ bool NextTransition(const time_point<seconds>& tp,
+ time_zone::civil_transition* trans) const override;
+ bool PrevTransition(const time_point<seconds>& tp,
+ time_zone::civil_transition* trans) const override;
+ std::string Version() const override;
+ std::string Description() const override;
+
+ private:
+ struct Header { // counts of:
+ std::size_t timecnt; // transition times
+ std::size_t typecnt; // transition types
+ std::size_t charcnt; // zone abbreviation characters
+ std::size_t leapcnt; // leap seconds (we expect none)
+ std::size_t ttisstdcnt; // UTC/local indicators (unused)
+ std::size_t ttisutcnt; // standard/wall indicators (unused)
+
+ bool Build(const tzhead& tzh);
+ std::size_t DataLength(std::size_t time_len) const;
+ };
+
+ bool GetTransitionType(std::int_fast32_t utc_offset, bool is_dst,
+ const std::string& abbr, std::uint_least8_t* index);
+ bool EquivTransitions(std::uint_fast8_t tt1_index,
+ std::uint_fast8_t tt2_index) const;
+ bool ExtendTransitions();
+
+ bool ResetToBuiltinUTC(const seconds& offset);
+ bool Load(ZoneInfoSource* zip);
+
+ // Helpers for BreakTime() and MakeTime().
+ time_zone::absolute_lookup LocalTime(std::int_fast64_t unix_time,
+ const TransitionType& tt) const;
+ time_zone::absolute_lookup LocalTime(std::int_fast64_t unix_time,
+ const Transition& tr) const;
+ time_zone::civil_lookup TimeLocal(const civil_second& cs,
+ year_t c4_shift) const;
+
+ std::vector<Transition> transitions_; // ordered by unix_time and civil_sec
+ std::vector<TransitionType> transition_types_; // distinct transition types
+ std::uint_fast8_t default_transition_type_; // for before first transition
+ std::string abbreviations_; // all the NUL-terminated abbreviations
+
+ std::string version_; // the tzdata version if available
+ std::string future_spec_; // for after the last zic transition
+ bool extended_; // future_spec_ was used to generate transitions
+ year_t last_year_; // the final year of the generated transitions
+
+ // We remember the transitions found during the last BreakTime() and
+ // MakeTime() calls. If the next request is for the same transition we
+ // will avoid re-searching.
+ mutable std::atomic<std::size_t> local_time_hint_ = {}; // BreakTime() hint
+ mutable std::atomic<std::size_t> time_local_hint_ = {}; // MakeTime() hint
+};
+
+} // namespace cctz
+} // namespace time_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_INFO_H_
diff --git a/third_party/abseil/src/absl/time/internal/cctz/src/time_zone_libc.cc b/third_party/abseil/src/absl/time/internal/cctz/src/time_zone_libc.cc
new file mode 100644
index 0000000..887dd09
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/src/time_zone_libc.cc
@@ -0,0 +1,315 @@
+// Copyright 2016 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#if defined(_WIN32) || defined(_WIN64)
+#define _CRT_SECURE_NO_WARNINGS 1
+#endif
+
+#include "time_zone_libc.h"
+
+#include <chrono>
+#include <ctime>
+#include <limits>
+#include <utility>
+
+#include "absl/base/config.h"
+#include "absl/time/internal/cctz/include/cctz/civil_time.h"
+#include "absl/time/internal/cctz/include/cctz/time_zone.h"
+
+#if defined(_AIX)
+extern "C" {
+extern long altzone;
+}
+#endif
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace time_internal {
+namespace cctz {
+
+namespace {
+
+#if defined(_WIN32) || defined(_WIN64)
+// Uses the globals: '_timezone', '_dstbias' and '_tzname'.
+auto tm_gmtoff(const std::tm& tm) -> decltype(_timezone + _dstbias) {
+ const bool is_dst = tm.tm_isdst > 0;
+ return _timezone + (is_dst ? _dstbias : 0);
+}
+auto tm_zone(const std::tm& tm) -> decltype(_tzname[0]) {
+ const bool is_dst = tm.tm_isdst > 0;
+ return _tzname[is_dst];
+}
+#elif defined(__sun) || defined(_AIX)
+// Uses the globals: 'timezone', 'altzone' and 'tzname'.
+auto tm_gmtoff(const std::tm& tm) -> decltype(timezone) {
+ const bool is_dst = tm.tm_isdst > 0;
+ return is_dst ? altzone : timezone;
+}
+auto tm_zone(const std::tm& tm) -> decltype(tzname[0]) {
+ const bool is_dst = tm.tm_isdst > 0;
+ return tzname[is_dst];
+}
+#elif defined(__native_client__) || defined(__myriad2__) || \
+ defined(__EMSCRIPTEN__)
+// Uses the globals: 'timezone' and 'tzname'.
+auto tm_gmtoff(const std::tm& tm) -> decltype(_timezone + 0) {
+ const bool is_dst = tm.tm_isdst > 0;
+ return _timezone + (is_dst ? 60 * 60 : 0);
+}
+auto tm_zone(const std::tm& tm) -> decltype(tzname[0]) {
+ const bool is_dst = tm.tm_isdst > 0;
+ return tzname[is_dst];
+}
+#else
+// Adapt to different spellings of the struct std::tm extension fields.
+#if defined(tm_gmtoff)
+auto tm_gmtoff(const std::tm& tm) -> decltype(tm.tm_gmtoff) {
+ return tm.tm_gmtoff;
+}
+#elif defined(__tm_gmtoff)
+auto tm_gmtoff(const std::tm& tm) -> decltype(tm.__tm_gmtoff) {
+ return tm.__tm_gmtoff;
+}
+#else
+template <typename T>
+auto tm_gmtoff(const T& tm) -> decltype(tm.tm_gmtoff) {
+ return tm.tm_gmtoff;
+}
+template <typename T>
+auto tm_gmtoff(const T& tm) -> decltype(tm.__tm_gmtoff) {
+ return tm.__tm_gmtoff;
+}
+#endif // tm_gmtoff
+#if defined(tm_zone)
+auto tm_zone(const std::tm& tm) -> decltype(tm.tm_zone) { return tm.tm_zone; }
+#elif defined(__tm_zone)
+auto tm_zone(const std::tm& tm) -> decltype(tm.__tm_zone) {
+ return tm.__tm_zone;
+}
+#else
+template <typename T>
+auto tm_zone(const T& tm) -> decltype(tm.tm_zone) {
+ return tm.tm_zone;
+}
+template <typename T>
+auto tm_zone(const T& tm) -> decltype(tm.__tm_zone) {
+ return tm.__tm_zone;
+}
+#endif // tm_zone
+#endif
+
+inline std::tm* gm_time(const std::time_t* timep, std::tm* result) {
+#if defined(_WIN32) || defined(_WIN64)
+ return gmtime_s(result, timep) ? nullptr : result;
+#else
+ return gmtime_r(timep, result);
+#endif
+}
+
+inline std::tm* local_time(const std::time_t* timep, std::tm* result) {
+#if defined(_WIN32) || defined(_WIN64)
+ return localtime_s(result, timep) ? nullptr : result;
+#else
+ return localtime_r(timep, result);
+#endif
+}
+
+// Converts a civil second and "dst" flag into a time_t and UTC offset.
+// Returns false if time_t cannot represent the requested civil second.
+// Caller must have already checked that cs.year() will fit into a tm_year.
+bool make_time(const civil_second& cs, int is_dst, std::time_t* t, int* off) {
+ std::tm tm;
+ tm.tm_year = static_cast<int>(cs.year() - year_t{1900});
+ tm.tm_mon = cs.month() - 1;
+ tm.tm_mday = cs.day();
+ tm.tm_hour = cs.hour();
+ tm.tm_min = cs.minute();
+ tm.tm_sec = cs.second();
+ tm.tm_isdst = is_dst;
+ *t = std::mktime(&tm);
+ if (*t == std::time_t{-1}) {
+ std::tm tm2;
+ const std::tm* tmp = local_time(t, &tm2);
+ if (tmp == nullptr || tmp->tm_year != tm.tm_year ||
+ tmp->tm_mon != tm.tm_mon || tmp->tm_mday != tm.tm_mday ||
+ tmp->tm_hour != tm.tm_hour || tmp->tm_min != tm.tm_min ||
+ tmp->tm_sec != tm.tm_sec) {
+ // A true error (not just one second before the epoch).
+ return false;
+ }
+ }
+ *off = static_cast<int>(tm_gmtoff(tm));
+ return true;
+}
+
+// Find the least time_t in [lo:hi] where local time matches offset, given:
+// (1) lo doesn't match, (2) hi does, and (3) there is only one transition.
+std::time_t find_trans(std::time_t lo, std::time_t hi, int offset) {
+ std::tm tm;
+ while (lo + 1 != hi) {
+ const std::time_t mid = lo + (hi - lo) / 2;
+ std::tm* tmp = local_time(&mid, &tm);
+ if (tmp != nullptr) {
+ if (tm_gmtoff(*tmp) == offset) {
+ hi = mid;
+ } else {
+ lo = mid;
+ }
+ } else {
+ // If std::tm cannot hold some result we resort to a linear search,
+ // ignoring all failed conversions. Slow, but never really happens.
+ while (++lo != hi) {
+ tmp = local_time(&lo, &tm);
+ if (tmp != nullptr) {
+ if (tm_gmtoff(*tmp) == offset) break;
+ }
+ }
+ return lo;
+ }
+ }
+ return hi;
+}
+
+} // namespace
+
+TimeZoneLibC::TimeZoneLibC(const std::string& name)
+ : local_(name == "localtime") {}
+
+time_zone::absolute_lookup TimeZoneLibC::BreakTime(
+ const time_point<seconds>& tp) const {
+ time_zone::absolute_lookup al;
+ al.offset = 0;
+ al.is_dst = false;
+ al.abbr = "-00";
+
+ const std::int_fast64_t s = ToUnixSeconds(tp);
+
+ // If std::time_t cannot hold the input we saturate the output.
+ if (s < std::numeric_limits<std::time_t>::min()) {
+ al.cs = civil_second::min();
+ return al;
+ }
+ if (s > std::numeric_limits<std::time_t>::max()) {
+ al.cs = civil_second::max();
+ return al;
+ }
+
+ const std::time_t t = static_cast<std::time_t>(s);
+ std::tm tm;
+ std::tm* tmp = local_ ? local_time(&t, &tm) : gm_time(&t, &tm);
+
+ // If std::tm cannot hold the result we saturate the output.
+ if (tmp == nullptr) {
+ al.cs = (s < 0) ? civil_second::min() : civil_second::max();
+ return al;
+ }
+
+ const year_t year = tmp->tm_year + year_t{1900};
+ al.cs = civil_second(year, tmp->tm_mon + 1, tmp->tm_mday, tmp->tm_hour,
+ tmp->tm_min, tmp->tm_sec);
+ al.offset = static_cast<int>(tm_gmtoff(*tmp));
+ al.abbr = local_ ? tm_zone(*tmp) : "UTC"; // as expected by cctz
+ al.is_dst = tmp->tm_isdst > 0;
+ return al;
+}
+
+time_zone::civil_lookup TimeZoneLibC::MakeTime(const civil_second& cs) const {
+ if (!local_) {
+ // If time_point<seconds> cannot hold the result we saturate.
+ static const civil_second min_tp_cs =
+ civil_second() + ToUnixSeconds(time_point<seconds>::min());
+ static const civil_second max_tp_cs =
+ civil_second() + ToUnixSeconds(time_point<seconds>::max());
+ const time_point<seconds> tp = (cs < min_tp_cs) ? time_point<seconds>::min()
+ : (cs > max_tp_cs)
+ ? time_point<seconds>::max()
+ : FromUnixSeconds(cs - civil_second());
+ return {time_zone::civil_lookup::UNIQUE, tp, tp, tp};
+ }
+
+ // If tm_year cannot hold the requested year we saturate the result.
+ if (cs.year() < 0) {
+ if (cs.year() < std::numeric_limits<int>::min() + year_t{1900}) {
+ const time_point<seconds> tp = time_point<seconds>::min();
+ return {time_zone::civil_lookup::UNIQUE, tp, tp, tp};
+ }
+ } else {
+ if (cs.year() - year_t{1900} > std::numeric_limits<int>::max()) {
+ const time_point<seconds> tp = time_point<seconds>::max();
+ return {time_zone::civil_lookup::UNIQUE, tp, tp, tp};
+ }
+ }
+
+ // We probe with "is_dst" values of 0 and 1 to try to distinguish unique
+ // civil seconds from skipped or repeated ones. This is not always possible
+ // however, as the "dst" flag does not change over some offset transitions.
+ // We are also subject to the vagaries of mktime() implementations.
+ std::time_t t0, t1;
+ int offset0, offset1;
+ if (make_time(cs, 0, &t0, &offset0) && make_time(cs, 1, &t1, &offset1)) {
+ if (t0 == t1) {
+ // The civil time was singular (pre == trans == post).
+ const time_point<seconds> tp = FromUnixSeconds(t0);
+ return {time_zone::civil_lookup::UNIQUE, tp, tp, tp};
+ }
+
+ if (t0 > t1) {
+ std::swap(t0, t1);
+ std::swap(offset0, offset1);
+ }
+ const std::time_t tt = find_trans(t0, t1, offset1);
+ const time_point<seconds> trans = FromUnixSeconds(tt);
+
+ if (offset0 < offset1) {
+ // The civil time did not exist (pre >= trans > post).
+ const time_point<seconds> pre = FromUnixSeconds(t1);
+ const time_point<seconds> post = FromUnixSeconds(t0);
+ return {time_zone::civil_lookup::SKIPPED, pre, trans, post};
+ }
+
+ // The civil time was ambiguous (pre < trans <= post).
+ const time_point<seconds> pre = FromUnixSeconds(t0);
+ const time_point<seconds> post = FromUnixSeconds(t1);
+ return {time_zone::civil_lookup::REPEATED, pre, trans, post};
+ }
+
+ // make_time() failed somehow so we saturate the result.
+ const time_point<seconds> tp = (cs < civil_second())
+ ? time_point<seconds>::min()
+ : time_point<seconds>::max();
+ return {time_zone::civil_lookup::UNIQUE, tp, tp, tp};
+}
+
+bool TimeZoneLibC::NextTransition(const time_point<seconds>&,
+ time_zone::civil_transition*) const {
+ return false;
+}
+
+bool TimeZoneLibC::PrevTransition(const time_point<seconds>&,
+ time_zone::civil_transition*) const {
+ return false;
+}
+
+std::string TimeZoneLibC::Version() const {
+ return std::string(); // unknown
+}
+
+std::string TimeZoneLibC::Description() const {
+ return local_ ? "localtime" : "UTC";
+}
+
+} // namespace cctz
+} // namespace time_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/time/internal/cctz/src/time_zone_libc.h b/third_party/abseil/src/absl/time/internal/cctz/src/time_zone_libc.h
new file mode 100644
index 0000000..1da9039
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/src/time_zone_libc.h
@@ -0,0 +1,55 @@
+// Copyright 2016 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_LIBC_H_
+#define ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_LIBC_H_
+
+#include <string>
+
+#include "absl/base/config.h"
+#include "time_zone_if.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace time_internal {
+namespace cctz {
+
+// A time zone backed by gmtime_r(3), localtime_r(3), and mktime(3),
+// and which therefore only supports UTC and the local time zone.
+// TODO: Add support for fixed offsets from UTC.
+class TimeZoneLibC : public TimeZoneIf {
+ public:
+ explicit TimeZoneLibC(const std::string& name);
+
+ // TimeZoneIf implementations.
+ time_zone::absolute_lookup BreakTime(
+ const time_point<seconds>& tp) const override;
+ time_zone::civil_lookup MakeTime(const civil_second& cs) const override;
+ bool NextTransition(const time_point<seconds>& tp,
+ time_zone::civil_transition* trans) const override;
+ bool PrevTransition(const time_point<seconds>& tp,
+ time_zone::civil_transition* trans) const override;
+ std::string Version() const override;
+ std::string Description() const override;
+
+ private:
+ const bool local_; // localtime or UTC
+};
+
+} // namespace cctz
+} // namespace time_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_LIBC_H_
diff --git a/third_party/abseil/src/absl/time/internal/cctz/src/time_zone_lookup.cc b/third_party/abseil/src/absl/time/internal/cctz/src/time_zone_lookup.cc
new file mode 100644
index 0000000..efdea64
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/src/time_zone_lookup.cc
@@ -0,0 +1,187 @@
+// Copyright 2016 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/base/config.h"
+#include "absl/time/internal/cctz/include/cctz/time_zone.h"
+
+#if defined(__ANDROID__)
+#include <sys/system_properties.h>
+#if defined(__ANDROID_API__) && __ANDROID_API__ >= 21
+#include <dlfcn.h>
+#endif
+#endif
+
+#if defined(__APPLE__)
+#include <CoreFoundation/CFTimeZone.h>
+
+#include <vector>
+#endif
+
+#include <cstdlib>
+#include <cstring>
+#include <string>
+
+#include "time_zone_fixed.h"
+#include "time_zone_impl.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace time_internal {
+namespace cctz {
+
+#if defined(__ANDROID__) && defined(__ANDROID_API__) && __ANDROID_API__ >= 21
+namespace {
+// Android 'L' removes __system_property_get() from the NDK, however
+// it is still a hidden symbol in libc so we use dlsym() to access it.
+// See Chromium's base/sys_info_android.cc for a similar example.
+
+using property_get_func = int (*)(const char*, char*);
+
+property_get_func LoadSystemPropertyGet() {
+ int flag = RTLD_LAZY | RTLD_GLOBAL;
+#if defined(RTLD_NOLOAD)
+ flag |= RTLD_NOLOAD; // libc.so should already be resident
+#endif
+ if (void* handle = dlopen("libc.so", flag)) {
+ void* sym = dlsym(handle, "__system_property_get");
+ dlclose(handle);
+ return reinterpret_cast<property_get_func>(sym);
+ }
+ return nullptr;
+}
+
+int __system_property_get(const char* name, char* value) {
+ static property_get_func system_property_get = LoadSystemPropertyGet();
+ return system_property_get ? system_property_get(name, value) : -1;
+}
+
+} // namespace
+#endif
+
+std::string time_zone::name() const { return effective_impl().Name(); }
+
+time_zone::absolute_lookup time_zone::lookup(
+ const time_point<seconds>& tp) const {
+ return effective_impl().BreakTime(tp);
+}
+
+time_zone::civil_lookup time_zone::lookup(const civil_second& cs) const {
+ return effective_impl().MakeTime(cs);
+}
+
+bool time_zone::next_transition(const time_point<seconds>& tp,
+ civil_transition* trans) const {
+ return effective_impl().NextTransition(tp, trans);
+}
+
+bool time_zone::prev_transition(const time_point<seconds>& tp,
+ civil_transition* trans) const {
+ return effective_impl().PrevTransition(tp, trans);
+}
+
+std::string time_zone::version() const { return effective_impl().Version(); }
+
+std::string time_zone::description() const {
+ return effective_impl().Description();
+}
+
+const time_zone::Impl& time_zone::effective_impl() const {
+ if (impl_ == nullptr) {
+ // Dereferencing an implicit-UTC time_zone is expected to be
+ // rare, so we don't mind paying a small synchronization cost.
+ return *time_zone::Impl::UTC().impl_;
+ }
+ return *impl_;
+}
+
+bool load_time_zone(const std::string& name, time_zone* tz) {
+ return time_zone::Impl::LoadTimeZone(name, tz);
+}
+
+time_zone utc_time_zone() {
+ return time_zone::Impl::UTC(); // avoid name lookup
+}
+
+time_zone fixed_time_zone(const seconds& offset) {
+ time_zone tz;
+ load_time_zone(FixedOffsetToName(offset), &tz);
+ return tz;
+}
+
+time_zone local_time_zone() {
+ const char* zone = ":localtime";
+#if defined(__ANDROID__)
+ char sysprop[PROP_VALUE_MAX];
+ if (__system_property_get("persist.sys.timezone", sysprop) > 0) {
+ zone = sysprop;
+ }
+#endif
+#if defined(__APPLE__)
+ std::vector<char> buffer;
+ CFTimeZoneRef tz_default = CFTimeZoneCopyDefault();
+ if (CFStringRef tz_name = CFTimeZoneGetName(tz_default)) {
+ CFStringEncoding encoding = kCFStringEncodingUTF8;
+ CFIndex length = CFStringGetLength(tz_name);
+ buffer.resize(CFStringGetMaximumSizeForEncoding(length, encoding) + 1);
+ if (CFStringGetCString(tz_name, &buffer[0], buffer.size(), encoding)) {
+ zone = &buffer[0];
+ }
+ }
+ CFRelease(tz_default);
+#endif
+
+ // Allow ${TZ} to override to default zone.
+ char* tz_env = nullptr;
+#if defined(_MSC_VER)
+ _dupenv_s(&tz_env, nullptr, "TZ");
+#else
+ tz_env = std::getenv("TZ");
+#endif
+ if (tz_env) zone = tz_env;
+
+ // We only support the "[:]<zone-name>" form.
+ if (*zone == ':') ++zone;
+
+ // Map "localtime" to a system-specific name, but
+ // allow ${LOCALTIME} to override the default name.
+ char* localtime_env = nullptr;
+ if (strcmp(zone, "localtime") == 0) {
+#if defined(_MSC_VER)
+ // System-specific default is just "localtime".
+ _dupenv_s(&localtime_env, nullptr, "LOCALTIME");
+#else
+ zone = "/etc/localtime"; // System-specific default.
+ localtime_env = std::getenv("LOCALTIME");
+#endif
+ if (localtime_env) zone = localtime_env;
+ }
+
+ const std::string name = zone;
+#if defined(_MSC_VER)
+ free(localtime_env);
+ free(tz_env);
+#endif
+
+ time_zone tz;
+ load_time_zone(name, &tz); // Falls back to UTC.
+ // TODO: Follow the RFC3339 "Unknown Local Offset Convention" and
+ // arrange for %z to generate "-0000" when we don't know the local
+ // offset because the load_time_zone() failed and we're using UTC.
+ return tz;
+}
+
+} // namespace cctz
+} // namespace time_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/time/internal/cctz/src/time_zone_lookup_test.cc b/third_party/abseil/src/absl/time/internal/cctz/src/time_zone_lookup_test.cc
new file mode 100644
index 0000000..9a1a8d6
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/src/time_zone_lookup_test.cc
@@ -0,0 +1,1442 @@
+// Copyright 2016 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <chrono>
+#include <cstddef>
+#include <cstdlib>
+#include <future>
+#include <limits>
+#include <string>
+#include <thread>
+#include <vector>
+
+#include "gtest/gtest.h"
+#include "absl/base/config.h"
+#include "absl/time/internal/cctz/include/cctz/civil_time.h"
+#include "absl/time/internal/cctz/include/cctz/time_zone.h"
+
+namespace chrono = std::chrono;
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace time_internal {
+namespace cctz {
+
+namespace {
+
+// A list of known time-zone names.
+const char* const kTimeZoneNames[] = {"Africa/Abidjan",
+ "Africa/Accra",
+ "Africa/Addis_Ababa",
+ "Africa/Algiers",
+ "Africa/Asmara",
+ "Africa/Asmera",
+ "Africa/Bamako",
+ "Africa/Bangui",
+ "Africa/Banjul",
+ "Africa/Bissau",
+ "Africa/Blantyre",
+ "Africa/Brazzaville",
+ "Africa/Bujumbura",
+ "Africa/Cairo",
+ "Africa/Casablanca",
+ "Africa/Ceuta",
+ "Africa/Conakry",
+ "Africa/Dakar",
+ "Africa/Dar_es_Salaam",
+ "Africa/Djibouti",
+ "Africa/Douala",
+ "Africa/El_Aaiun",
+ "Africa/Freetown",
+ "Africa/Gaborone",
+ "Africa/Harare",
+ "Africa/Johannesburg",
+ "Africa/Juba",
+ "Africa/Kampala",
+ "Africa/Khartoum",
+ "Africa/Kigali",
+ "Africa/Kinshasa",
+ "Africa/Lagos",
+ "Africa/Libreville",
+ "Africa/Lome",
+ "Africa/Luanda",
+ "Africa/Lubumbashi",
+ "Africa/Lusaka",
+ "Africa/Malabo",
+ "Africa/Maputo",
+ "Africa/Maseru",
+ "Africa/Mbabane",
+ "Africa/Mogadishu",
+ "Africa/Monrovia",
+ "Africa/Nairobi",
+ "Africa/Ndjamena",
+ "Africa/Niamey",
+ "Africa/Nouakchott",
+ "Africa/Ouagadougou",
+ "Africa/Porto-Novo",
+ "Africa/Sao_Tome",
+ "Africa/Timbuktu",
+ "Africa/Tripoli",
+ "Africa/Tunis",
+ "Africa/Windhoek",
+ "America/Adak",
+ "America/Anchorage",
+ "America/Anguilla",
+ "America/Antigua",
+ "America/Araguaina",
+ "America/Argentina/Buenos_Aires",
+ "America/Argentina/Catamarca",
+ "America/Argentina/ComodRivadavia",
+ "America/Argentina/Cordoba",
+ "America/Argentina/Jujuy",
+ "America/Argentina/La_Rioja",
+ "America/Argentina/Mendoza",
+ "America/Argentina/Rio_Gallegos",
+ "America/Argentina/Salta",
+ "America/Argentina/San_Juan",
+ "America/Argentina/San_Luis",
+ "America/Argentina/Tucuman",
+ "America/Argentina/Ushuaia",
+ "America/Aruba",
+ "America/Asuncion",
+ "America/Atikokan",
+ "America/Atka",
+ "America/Bahia",
+ "America/Bahia_Banderas",
+ "America/Barbados",
+ "America/Belem",
+ "America/Belize",
+ "America/Blanc-Sablon",
+ "America/Boa_Vista",
+ "America/Bogota",
+ "America/Boise",
+ "America/Buenos_Aires",
+ "America/Cambridge_Bay",
+ "America/Campo_Grande",
+ "America/Cancun",
+ "America/Caracas",
+ "America/Catamarca",
+ "America/Cayenne",
+ "America/Cayman",
+ "America/Chicago",
+ "America/Chihuahua",
+ "America/Coral_Harbour",
+ "America/Cordoba",
+ "America/Costa_Rica",
+ "America/Creston",
+ "America/Cuiaba",
+ "America/Curacao",
+ "America/Danmarkshavn",
+ "America/Dawson",
+ "America/Dawson_Creek",
+ "America/Denver",
+ "America/Detroit",
+ "America/Dominica",
+ "America/Edmonton",
+ "America/Eirunepe",
+ "America/El_Salvador",
+ "America/Ensenada",
+ "America/Fort_Nelson",
+ "America/Fort_Wayne",
+ "America/Fortaleza",
+ "America/Glace_Bay",
+ "America/Godthab",
+ "America/Goose_Bay",
+ "America/Grand_Turk",
+ "America/Grenada",
+ "America/Guadeloupe",
+ "America/Guatemala",
+ "America/Guayaquil",
+ "America/Guyana",
+ "America/Halifax",
+ "America/Havana",
+ "America/Hermosillo",
+ "America/Indiana/Indianapolis",
+ "America/Indiana/Knox",
+ "America/Indiana/Marengo",
+ "America/Indiana/Petersburg",
+ "America/Indiana/Tell_City",
+ "America/Indiana/Vevay",
+ "America/Indiana/Vincennes",
+ "America/Indiana/Winamac",
+ "America/Indianapolis",
+ "America/Inuvik",
+ "America/Iqaluit",
+ "America/Jamaica",
+ "America/Jujuy",
+ "America/Juneau",
+ "America/Kentucky/Louisville",
+ "America/Kentucky/Monticello",
+ "America/Knox_IN",
+ "America/Kralendijk",
+ "America/La_Paz",
+ "America/Lima",
+ "America/Los_Angeles",
+ "America/Louisville",
+ "America/Lower_Princes",
+ "America/Maceio",
+ "America/Managua",
+ "America/Manaus",
+ "America/Marigot",
+ "America/Martinique",
+ "America/Matamoros",
+ "America/Mazatlan",
+ "America/Mendoza",
+ "America/Menominee",
+ "America/Merida",
+ "America/Metlakatla",
+ "America/Mexico_City",
+ "America/Miquelon",
+ "America/Moncton",
+ "America/Monterrey",
+ "America/Montevideo",
+ "America/Montreal",
+ "America/Montserrat",
+ "America/Nassau",
+ "America/New_York",
+ "America/Nipigon",
+ "America/Nome",
+ "America/Noronha",
+ "America/North_Dakota/Beulah",
+ "America/North_Dakota/Center",
+ "America/North_Dakota/New_Salem",
+ "America/Nuuk",
+ "America/Ojinaga",
+ "America/Panama",
+ "America/Pangnirtung",
+ "America/Paramaribo",
+ "America/Phoenix",
+ "America/Port-au-Prince",
+ "America/Port_of_Spain",
+ "America/Porto_Acre",
+ "America/Porto_Velho",
+ "America/Puerto_Rico",
+ "America/Punta_Arenas",
+ "America/Rainy_River",
+ "America/Rankin_Inlet",
+ "America/Recife",
+ "America/Regina",
+ "America/Resolute",
+ "America/Rio_Branco",
+ "America/Rosario",
+ "America/Santa_Isabel",
+ "America/Santarem",
+ "America/Santiago",
+ "America/Santo_Domingo",
+ "America/Sao_Paulo",
+ "America/Scoresbysund",
+ "America/Shiprock",
+ "America/Sitka",
+ "America/St_Barthelemy",
+ "America/St_Johns",
+ "America/St_Kitts",
+ "America/St_Lucia",
+ "America/St_Thomas",
+ "America/St_Vincent",
+ "America/Swift_Current",
+ "America/Tegucigalpa",
+ "America/Thule",
+ "America/Thunder_Bay",
+ "America/Tijuana",
+ "America/Toronto",
+ "America/Tortola",
+ "America/Vancouver",
+ "America/Virgin",
+ "America/Whitehorse",
+ "America/Winnipeg",
+ "America/Yakutat",
+ "America/Yellowknife",
+ "Antarctica/Casey",
+ "Antarctica/Davis",
+ "Antarctica/DumontDUrville",
+ "Antarctica/Macquarie",
+ "Antarctica/Mawson",
+ "Antarctica/McMurdo",
+ "Antarctica/Palmer",
+ "Antarctica/Rothera",
+ "Antarctica/South_Pole",
+ "Antarctica/Syowa",
+ "Antarctica/Troll",
+ "Antarctica/Vostok",
+ "Arctic/Longyearbyen",
+ "Asia/Aden",
+ "Asia/Almaty",
+ "Asia/Amman",
+ "Asia/Anadyr",
+ "Asia/Aqtau",
+ "Asia/Aqtobe",
+ "Asia/Ashgabat",
+ "Asia/Ashkhabad",
+ "Asia/Atyrau",
+ "Asia/Baghdad",
+ "Asia/Bahrain",
+ "Asia/Baku",
+ "Asia/Bangkok",
+ "Asia/Barnaul",
+ "Asia/Beirut",
+ "Asia/Bishkek",
+ "Asia/Brunei",
+ "Asia/Calcutta",
+ "Asia/Chita",
+ "Asia/Choibalsan",
+ "Asia/Chongqing",
+ "Asia/Chungking",
+ "Asia/Colombo",
+ "Asia/Dacca",
+ "Asia/Damascus",
+ "Asia/Dhaka",
+ "Asia/Dili",
+ "Asia/Dubai",
+ "Asia/Dushanbe",
+ "Asia/Famagusta",
+ "Asia/Gaza",
+ "Asia/Harbin",
+ "Asia/Hebron",
+ "Asia/Ho_Chi_Minh",
+ "Asia/Hong_Kong",
+ "Asia/Hovd",
+ "Asia/Irkutsk",
+ "Asia/Istanbul",
+ "Asia/Jakarta",
+ "Asia/Jayapura",
+ "Asia/Jerusalem",
+ "Asia/Kabul",
+ "Asia/Kamchatka",
+ "Asia/Karachi",
+ "Asia/Kashgar",
+ "Asia/Kathmandu",
+ "Asia/Katmandu",
+ "Asia/Khandyga",
+ "Asia/Kolkata",
+ "Asia/Krasnoyarsk",
+ "Asia/Kuala_Lumpur",
+ "Asia/Kuching",
+ "Asia/Kuwait",
+ "Asia/Macao",
+ "Asia/Macau",
+ "Asia/Magadan",
+ "Asia/Makassar",
+ "Asia/Manila",
+ "Asia/Muscat",
+ "Asia/Nicosia",
+ "Asia/Novokuznetsk",
+ "Asia/Novosibirsk",
+ "Asia/Omsk",
+ "Asia/Oral",
+ "Asia/Phnom_Penh",
+ "Asia/Pontianak",
+ "Asia/Pyongyang",
+ "Asia/Qatar",
+ "Asia/Qostanay",
+ "Asia/Qyzylorda",
+ "Asia/Rangoon",
+ "Asia/Riyadh",
+ "Asia/Saigon",
+ "Asia/Sakhalin",
+ "Asia/Samarkand",
+ "Asia/Seoul",
+ "Asia/Shanghai",
+ "Asia/Singapore",
+ "Asia/Srednekolymsk",
+ "Asia/Taipei",
+ "Asia/Tashkent",
+ "Asia/Tbilisi",
+ "Asia/Tehran",
+ "Asia/Tel_Aviv",
+ "Asia/Thimbu",
+ "Asia/Thimphu",
+ "Asia/Tokyo",
+ "Asia/Tomsk",
+ "Asia/Ujung_Pandang",
+ "Asia/Ulaanbaatar",
+ "Asia/Ulan_Bator",
+ "Asia/Urumqi",
+ "Asia/Ust-Nera",
+ "Asia/Vientiane",
+ "Asia/Vladivostok",
+ "Asia/Yakutsk",
+ "Asia/Yangon",
+ "Asia/Yekaterinburg",
+ "Asia/Yerevan",
+ "Atlantic/Azores",
+ "Atlantic/Bermuda",
+ "Atlantic/Canary",
+ "Atlantic/Cape_Verde",
+ "Atlantic/Faeroe",
+ "Atlantic/Faroe",
+ "Atlantic/Jan_Mayen",
+ "Atlantic/Madeira",
+ "Atlantic/Reykjavik",
+ "Atlantic/South_Georgia",
+ "Atlantic/St_Helena",
+ "Atlantic/Stanley",
+ "Australia/ACT",
+ "Australia/Adelaide",
+ "Australia/Brisbane",
+ "Australia/Broken_Hill",
+ "Australia/Canberra",
+ "Australia/Currie",
+ "Australia/Darwin",
+ "Australia/Eucla",
+ "Australia/Hobart",
+ "Australia/LHI",
+ "Australia/Lindeman",
+ "Australia/Lord_Howe",
+ "Australia/Melbourne",
+ "Australia/NSW",
+ "Australia/North",
+ "Australia/Perth",
+ "Australia/Queensland",
+ "Australia/South",
+ "Australia/Sydney",
+ "Australia/Tasmania",
+ "Australia/Victoria",
+ "Australia/West",
+ "Australia/Yancowinna",
+ "Brazil/Acre",
+ "Brazil/DeNoronha",
+ "Brazil/East",
+ "Brazil/West",
+ "CET",
+ "CST6CDT",
+ "Canada/Atlantic",
+ "Canada/Central",
+ "Canada/Eastern",
+ "Canada/Mountain",
+ "Canada/Newfoundland",
+ "Canada/Pacific",
+ "Canada/Saskatchewan",
+ "Canada/Yukon",
+ "Chile/Continental",
+ "Chile/EasterIsland",
+ "Cuba",
+ "EET",
+ "EST",
+ "EST5EDT",
+ "Egypt",
+ "Eire",
+ "Etc/GMT",
+ "Etc/GMT+0",
+ "Etc/GMT+1",
+ "Etc/GMT+10",
+ "Etc/GMT+11",
+ "Etc/GMT+12",
+ "Etc/GMT+2",
+ "Etc/GMT+3",
+ "Etc/GMT+4",
+ "Etc/GMT+5",
+ "Etc/GMT+6",
+ "Etc/GMT+7",
+ "Etc/GMT+8",
+ "Etc/GMT+9",
+ "Etc/GMT-0",
+ "Etc/GMT-1",
+ "Etc/GMT-10",
+ "Etc/GMT-11",
+ "Etc/GMT-12",
+ "Etc/GMT-13",
+ "Etc/GMT-14",
+ "Etc/GMT-2",
+ "Etc/GMT-3",
+ "Etc/GMT-4",
+ "Etc/GMT-5",
+ "Etc/GMT-6",
+ "Etc/GMT-7",
+ "Etc/GMT-8",
+ "Etc/GMT-9",
+ "Etc/GMT0",
+ "Etc/Greenwich",
+ "Etc/UCT",
+ "Etc/UTC",
+ "Etc/Universal",
+ "Etc/Zulu",
+ "Europe/Amsterdam",
+ "Europe/Andorra",
+ "Europe/Astrakhan",
+ "Europe/Athens",
+ "Europe/Belfast",
+ "Europe/Belgrade",
+ "Europe/Berlin",
+ "Europe/Bratislava",
+ "Europe/Brussels",
+ "Europe/Bucharest",
+ "Europe/Budapest",
+ "Europe/Busingen",
+ "Europe/Chisinau",
+ "Europe/Copenhagen",
+ "Europe/Dublin",
+ "Europe/Gibraltar",
+ "Europe/Guernsey",
+ "Europe/Helsinki",
+ "Europe/Isle_of_Man",
+ "Europe/Istanbul",
+ "Europe/Jersey",
+ "Europe/Kaliningrad",
+ "Europe/Kiev",
+ "Europe/Kirov",
+ "Europe/Lisbon",
+ "Europe/Ljubljana",
+ "Europe/London",
+ "Europe/Luxembourg",
+ "Europe/Madrid",
+ "Europe/Malta",
+ "Europe/Mariehamn",
+ "Europe/Minsk",
+ "Europe/Monaco",
+ "Europe/Moscow",
+ "Europe/Nicosia",
+ "Europe/Oslo",
+ "Europe/Paris",
+ "Europe/Podgorica",
+ "Europe/Prague",
+ "Europe/Riga",
+ "Europe/Rome",
+ "Europe/Samara",
+ "Europe/San_Marino",
+ "Europe/Sarajevo",
+ "Europe/Saratov",
+ "Europe/Simferopol",
+ "Europe/Skopje",
+ "Europe/Sofia",
+ "Europe/Stockholm",
+ "Europe/Tallinn",
+ "Europe/Tirane",
+ "Europe/Tiraspol",
+ "Europe/Ulyanovsk",
+ "Europe/Uzhgorod",
+ "Europe/Vaduz",
+ "Europe/Vatican",
+ "Europe/Vienna",
+ "Europe/Vilnius",
+ "Europe/Volgograd",
+ "Europe/Warsaw",
+ "Europe/Zagreb",
+ "Europe/Zaporozhye",
+ "Europe/Zurich",
+ "GB",
+ "GB-Eire",
+ "GMT",
+ "GMT+0",
+ "GMT-0",
+ "GMT0",
+ "Greenwich",
+ "HST",
+ "Hongkong",
+ "Iceland",
+ "Indian/Antananarivo",
+ "Indian/Chagos",
+ "Indian/Christmas",
+ "Indian/Cocos",
+ "Indian/Comoro",
+ "Indian/Kerguelen",
+ "Indian/Mahe",
+ "Indian/Maldives",
+ "Indian/Mauritius",
+ "Indian/Mayotte",
+ "Indian/Reunion",
+ "Iran",
+ "Israel",
+ "Jamaica",
+ "Japan",
+ "Kwajalein",
+ "Libya",
+ "MET",
+ "MST",
+ "MST7MDT",
+ "Mexico/BajaNorte",
+ "Mexico/BajaSur",
+ "Mexico/General",
+ "NZ",
+ "NZ-CHAT",
+ "Navajo",
+ "PRC",
+ "PST8PDT",
+ "Pacific/Apia",
+ "Pacific/Auckland",
+ "Pacific/Bougainville",
+ "Pacific/Chatham",
+ "Pacific/Chuuk",
+ "Pacific/Easter",
+ "Pacific/Efate",
+ "Pacific/Enderbury",
+ "Pacific/Fakaofo",
+ "Pacific/Fiji",
+ "Pacific/Funafuti",
+ "Pacific/Galapagos",
+ "Pacific/Gambier",
+ "Pacific/Guadalcanal",
+ "Pacific/Guam",
+ "Pacific/Honolulu",
+ "Pacific/Johnston",
+ "Pacific/Kiritimati",
+ "Pacific/Kosrae",
+ "Pacific/Kwajalein",
+ "Pacific/Majuro",
+ "Pacific/Marquesas",
+ "Pacific/Midway",
+ "Pacific/Nauru",
+ "Pacific/Niue",
+ "Pacific/Norfolk",
+ "Pacific/Noumea",
+ "Pacific/Pago_Pago",
+ "Pacific/Palau",
+ "Pacific/Pitcairn",
+ "Pacific/Pohnpei",
+ "Pacific/Ponape",
+ "Pacific/Port_Moresby",
+ "Pacific/Rarotonga",
+ "Pacific/Saipan",
+ "Pacific/Samoa",
+ "Pacific/Tahiti",
+ "Pacific/Tarawa",
+ "Pacific/Tongatapu",
+ "Pacific/Truk",
+ "Pacific/Wake",
+ "Pacific/Wallis",
+ "Pacific/Yap",
+ "Poland",
+ "Portugal",
+ "ROC",
+ "ROK",
+ "Singapore",
+ "Turkey",
+ "UCT",
+ "US/Alaska",
+ "US/Aleutian",
+ "US/Arizona",
+ "US/Central",
+ "US/East-Indiana",
+ "US/Eastern",
+ "US/Hawaii",
+ "US/Indiana-Starke",
+ "US/Michigan",
+ "US/Mountain",
+ "US/Pacific",
+ "US/Samoa",
+ "UTC",
+ "Universal",
+ "W-SU",
+ "WET",
+ "Zulu",
+ nullptr};
+
+// Helper to return a loaded time zone by value (UTC on error).
+time_zone LoadZone(const std::string& name) {
+ time_zone tz;
+ load_time_zone(name, &tz);
+ return tz;
+}
+
+// This helper is a macro so that failed expectations show up with the
+// correct line numbers.
+#define ExpectTime(tp, tz, y, m, d, hh, mm, ss, off, isdst, zone) \
+ do { \
+ time_zone::absolute_lookup al = tz.lookup(tp); \
+ EXPECT_EQ(y, al.cs.year()); \
+ EXPECT_EQ(m, al.cs.month()); \
+ EXPECT_EQ(d, al.cs.day()); \
+ EXPECT_EQ(hh, al.cs.hour()); \
+ EXPECT_EQ(mm, al.cs.minute()); \
+ EXPECT_EQ(ss, al.cs.second()); \
+ EXPECT_EQ(off, al.offset); \
+ EXPECT_TRUE(isdst == al.is_dst); \
+ /* EXPECT_STREQ(zone, al.abbr); */ \
+ } while (0)
+
+// These tests sometimes run on platforms that have zoneinfo data so old
+// that the transition we are attempting to check does not exist, most
+// notably Android emulators. Fortunately, AndroidZoneInfoSource supports
+// time_zone::version() so, in cases where we've learned that it matters,
+// we can make the check conditionally.
+int VersionCmp(time_zone tz, const std::string& target) {
+ std::string version = tz.version();
+ if (version.empty() && !target.empty()) return 1; // unknown > known
+ return version.compare(target);
+}
+
+} // namespace
+
+#if !defined(__EMSCRIPTEN__)
+TEST(TimeZones, LoadZonesConcurrently) {
+ std::promise<void> ready_promise;
+ std::shared_future<void> ready_future(ready_promise.get_future());
+ auto load_zones = [ready_future](std::promise<void>* started,
+ std::set<std::string>* failures) {
+ started->set_value();
+ ready_future.wait();
+ for (const char* const* np = kTimeZoneNames; *np != nullptr; ++np) {
+ std::string zone = *np;
+ time_zone tz;
+ if (load_time_zone(zone, &tz)) {
+ EXPECT_EQ(zone, tz.name());
+ } else {
+ failures->insert(zone);
+ }
+ }
+ };
+
+ const std::size_t n_threads = 128;
+ std::vector<std::thread> threads;
+ std::vector<std::set<std::string>> thread_failures(n_threads);
+ for (std::size_t i = 0; i != n_threads; ++i) {
+ std::promise<void> started;
+ threads.emplace_back(load_zones, &started, &thread_failures[i]);
+ started.get_future().wait();
+ }
+ ready_promise.set_value();
+ for (auto& thread : threads) {
+ thread.join();
+ }
+
+ // Allow a small number of failures to account for skew between
+ // the contents of kTimeZoneNames and the zoneinfo data source.
+#if defined(__ANDROID__)
+ // Cater to the possibility of using an even older zoneinfo data
+ // source when running on Android, where it is difficult to override
+ // the bionic tzdata provided by the test environment.
+ const std::size_t max_failures = 20;
+#else
+ const std::size_t max_failures = 3;
+#endif
+ std::set<std::string> failures;
+ for (const auto& thread_failure : thread_failures) {
+ failures.insert(thread_failure.begin(), thread_failure.end());
+ }
+ EXPECT_LE(failures.size(), max_failures) << testing::PrintToString(failures);
+}
+#endif
+
+TEST(TimeZone, NamedTimeZones) {
+ const time_zone utc = utc_time_zone();
+ EXPECT_EQ("UTC", utc.name());
+ const time_zone nyc = LoadZone("America/New_York");
+ EXPECT_EQ("America/New_York", nyc.name());
+ const time_zone syd = LoadZone("Australia/Sydney");
+ EXPECT_EQ("Australia/Sydney", syd.name());
+ const time_zone fixed0 =
+ fixed_time_zone(absl::time_internal::cctz::seconds::zero());
+ EXPECT_EQ("UTC", fixed0.name());
+ const time_zone fixed_pos = fixed_time_zone(
+ chrono::hours(3) + chrono::minutes(25) + chrono::seconds(45));
+ EXPECT_EQ("Fixed/UTC+03:25:45", fixed_pos.name());
+ const time_zone fixed_neg = fixed_time_zone(
+ -(chrono::hours(12) + chrono::minutes(34) + chrono::seconds(56)));
+ EXPECT_EQ("Fixed/UTC-12:34:56", fixed_neg.name());
+}
+
+TEST(TimeZone, Failures) {
+ time_zone tz;
+ EXPECT_FALSE(load_time_zone(":America/Los_Angeles", &tz));
+
+ tz = LoadZone("America/Los_Angeles");
+ EXPECT_FALSE(load_time_zone("Invalid/TimeZone", &tz));
+ EXPECT_EQ(chrono::system_clock::from_time_t(0),
+ convert(civil_second(1970, 1, 1, 0, 0, 0), tz)); // UTC
+
+ // Ensures that the load still fails on a subsequent attempt.
+ tz = LoadZone("America/Los_Angeles");
+ EXPECT_FALSE(load_time_zone("Invalid/TimeZone", &tz));
+ EXPECT_EQ(chrono::system_clock::from_time_t(0),
+ convert(civil_second(1970, 1, 1, 0, 0, 0), tz)); // UTC
+
+ // Loading an empty string timezone should fail.
+ tz = LoadZone("America/Los_Angeles");
+ EXPECT_FALSE(load_time_zone("", &tz));
+ EXPECT_EQ(chrono::system_clock::from_time_t(0),
+ convert(civil_second(1970, 1, 1, 0, 0, 0), tz)); // UTC
+}
+
+TEST(TimeZone, Equality) {
+ const time_zone a;
+ const time_zone b;
+ EXPECT_EQ(a, b);
+ EXPECT_EQ(a.name(), b.name());
+
+ const time_zone implicit_utc;
+ const time_zone explicit_utc = utc_time_zone();
+ EXPECT_EQ(implicit_utc, explicit_utc);
+ EXPECT_EQ(implicit_utc.name(), explicit_utc.name());
+
+ const time_zone fixed_zero =
+ fixed_time_zone(absl::time_internal::cctz::seconds::zero());
+ EXPECT_EQ(fixed_zero, LoadZone(fixed_zero.name()));
+ EXPECT_EQ(fixed_zero, explicit_utc);
+
+ const time_zone fixed_utc = LoadZone("Fixed/UTC+00:00:00");
+ EXPECT_EQ(fixed_utc, LoadZone(fixed_utc.name()));
+ EXPECT_EQ(fixed_utc, explicit_utc);
+
+ const time_zone fixed_pos = fixed_time_zone(
+ chrono::hours(3) + chrono::minutes(25) + chrono::seconds(45));
+ EXPECT_EQ(fixed_pos, LoadZone(fixed_pos.name()));
+ EXPECT_NE(fixed_pos, explicit_utc);
+ const time_zone fixed_neg = fixed_time_zone(
+ -(chrono::hours(12) + chrono::minutes(34) + chrono::seconds(56)));
+ EXPECT_EQ(fixed_neg, LoadZone(fixed_neg.name()));
+ EXPECT_NE(fixed_neg, explicit_utc);
+
+ const time_zone fixed_lim = fixed_time_zone(chrono::hours(24));
+ EXPECT_EQ(fixed_lim, LoadZone(fixed_lim.name()));
+ EXPECT_NE(fixed_lim, explicit_utc);
+ const time_zone fixed_ovfl =
+ fixed_time_zone(chrono::hours(24) + chrono::seconds(1));
+ EXPECT_EQ(fixed_ovfl, LoadZone(fixed_ovfl.name()));
+ EXPECT_EQ(fixed_ovfl, explicit_utc);
+
+ EXPECT_EQ(fixed_time_zone(chrono::seconds(1)),
+ fixed_time_zone(chrono::seconds(1)));
+
+ const time_zone local = local_time_zone();
+ EXPECT_EQ(local, LoadZone(local.name()));
+
+ time_zone la = LoadZone("America/Los_Angeles");
+ time_zone nyc = LoadZone("America/New_York");
+ EXPECT_NE(la, nyc);
+}
+
+TEST(StdChronoTimePoint, TimeTAlignment) {
+ // Ensures that the Unix epoch and the system clock epoch are an integral
+ // number of seconds apart. This simplifies conversions to/from time_t.
+ auto diff =
+ chrono::system_clock::time_point() - chrono::system_clock::from_time_t(0);
+ EXPECT_EQ(chrono::system_clock::time_point::duration::zero(),
+ diff % chrono::seconds(1));
+}
+
+TEST(BreakTime, TimePointResolution) {
+ const time_zone utc = utc_time_zone();
+ const auto t0 = chrono::system_clock::from_time_t(0);
+
+ ExpectTime(chrono::time_point_cast<chrono::nanoseconds>(t0), utc, 1970, 1, 1,
+ 0, 0, 0, 0, false, "UTC");
+ ExpectTime(chrono::time_point_cast<chrono::microseconds>(t0), utc, 1970, 1, 1,
+ 0, 0, 0, 0, false, "UTC");
+ ExpectTime(chrono::time_point_cast<chrono::milliseconds>(t0), utc, 1970, 1, 1,
+ 0, 0, 0, 0, false, "UTC");
+ ExpectTime(chrono::time_point_cast<chrono::seconds>(t0), utc, 1970, 1, 1, 0,
+ 0, 0, 0, false, "UTC");
+ ExpectTime(chrono::time_point_cast<absl::time_internal::cctz::seconds>(t0),
+ utc, 1970, 1, 1, 0, 0, 0, 0, false, "UTC");
+ ExpectTime(chrono::time_point_cast<chrono::minutes>(t0), utc, 1970, 1, 1, 0,
+ 0, 0, 0, false, "UTC");
+ ExpectTime(chrono::time_point_cast<chrono::hours>(t0), utc, 1970, 1, 1, 0, 0,
+ 0, 0, false, "UTC");
+}
+
+TEST(BreakTime, LocalTimeInUTC) {
+ const time_zone tz = utc_time_zone();
+ const auto tp = chrono::system_clock::from_time_t(0);
+ ExpectTime(tp, tz, 1970, 1, 1, 0, 0, 0, 0, false, "UTC");
+ EXPECT_EQ(weekday::thursday, get_weekday(convert(tp, tz)));
+}
+
+TEST(BreakTime, LocalTimeInUTCUnaligned) {
+ const time_zone tz = utc_time_zone();
+ const auto tp =
+ chrono::system_clock::from_time_t(0) - chrono::milliseconds(500);
+ ExpectTime(tp, tz, 1969, 12, 31, 23, 59, 59, 0, false, "UTC");
+ EXPECT_EQ(weekday::wednesday, get_weekday(convert(tp, tz)));
+}
+
+TEST(BreakTime, LocalTimePosix) {
+ // See IEEE Std 1003.1-1988 B.2.3 General Terms, Epoch.
+ const time_zone tz = utc_time_zone();
+ const auto tp = chrono::system_clock::from_time_t(536457599);
+ ExpectTime(tp, tz, 1986, 12, 31, 23, 59, 59, 0, false, "UTC");
+ EXPECT_EQ(weekday::wednesday, get_weekday(convert(tp, tz)));
+}
+
+TEST(TimeZoneImpl, LocalTimeInFixed) {
+ const absl::time_internal::cctz::seconds offset =
+ -(chrono::hours(8) + chrono::minutes(33) + chrono::seconds(47));
+ const time_zone tz = fixed_time_zone(offset);
+ const auto tp = chrono::system_clock::from_time_t(0);
+ ExpectTime(tp, tz, 1969, 12, 31, 15, 26, 13, offset.count(), false,
+ "-083347");
+ EXPECT_EQ(weekday::wednesday, get_weekday(convert(tp, tz)));
+}
+
+TEST(BreakTime, LocalTimeInNewYork) {
+ const time_zone tz = LoadZone("America/New_York");
+ const auto tp = chrono::system_clock::from_time_t(45);
+ ExpectTime(tp, tz, 1969, 12, 31, 19, 0, 45, -5 * 60 * 60, false, "EST");
+ EXPECT_EQ(weekday::wednesday, get_weekday(convert(tp, tz)));
+}
+
+TEST(BreakTime, LocalTimeInMTV) {
+ const time_zone tz = LoadZone("America/Los_Angeles");
+ const auto tp = chrono::system_clock::from_time_t(1380855729);
+ ExpectTime(tp, tz, 2013, 10, 3, 20, 2, 9, -7 * 60 * 60, true, "PDT");
+ EXPECT_EQ(weekday::thursday, get_weekday(convert(tp, tz)));
+}
+
+TEST(BreakTime, LocalTimeInSydney) {
+ const time_zone tz = LoadZone("Australia/Sydney");
+ const auto tp = chrono::system_clock::from_time_t(90);
+ ExpectTime(tp, tz, 1970, 1, 1, 10, 1, 30, 10 * 60 * 60, false, "AEST");
+ EXPECT_EQ(weekday::thursday, get_weekday(convert(tp, tz)));
+}
+
+TEST(MakeTime, TimePointResolution) {
+ const time_zone utc = utc_time_zone();
+ const time_point<chrono::nanoseconds> tp_ns =
+ convert(civil_second(2015, 1, 2, 3, 4, 5), utc);
+ EXPECT_EQ("04:05", format("%M:%E*S", tp_ns, utc));
+ const time_point<chrono::microseconds> tp_us =
+ convert(civil_second(2015, 1, 2, 3, 4, 5), utc);
+ EXPECT_EQ("04:05", format("%M:%E*S", tp_us, utc));
+ const time_point<chrono::milliseconds> tp_ms =
+ convert(civil_second(2015, 1, 2, 3, 4, 5), utc);
+ EXPECT_EQ("04:05", format("%M:%E*S", tp_ms, utc));
+ const time_point<chrono::seconds> tp_s =
+ convert(civil_second(2015, 1, 2, 3, 4, 5), utc);
+ EXPECT_EQ("04:05", format("%M:%E*S", tp_s, utc));
+ const time_point<absl::time_internal::cctz::seconds> tp_s64 =
+ convert(civil_second(2015, 1, 2, 3, 4, 5), utc);
+ EXPECT_EQ("04:05", format("%M:%E*S", tp_s64, utc));
+
+ // These next two require chrono::time_point_cast because the conversion
+ // from a resolution of seconds (the return value of convert()) to a
+ // coarser resolution requires an explicit cast.
+ const time_point<chrono::minutes> tp_m =
+ chrono::time_point_cast<chrono::minutes>(
+ convert(civil_second(2015, 1, 2, 3, 4, 5), utc));
+ EXPECT_EQ("04:00", format("%M:%E*S", tp_m, utc));
+ const time_point<chrono::hours> tp_h = chrono::time_point_cast<chrono::hours>(
+ convert(civil_second(2015, 1, 2, 3, 4, 5), utc));
+ EXPECT_EQ("00:00", format("%M:%E*S", tp_h, utc));
+}
+
+TEST(MakeTime, Normalization) {
+ const time_zone tz = LoadZone("America/New_York");
+ const auto tp = convert(civil_second(2009, 2, 13, 18, 31, 30), tz);
+ EXPECT_EQ(chrono::system_clock::from_time_t(1234567890), tp);
+
+ // Now requests for the same time_point but with out-of-range fields.
+ EXPECT_EQ(tp, convert(civil_second(2008, 14, 13, 18, 31, 30), tz)); // month
+ EXPECT_EQ(tp, convert(civil_second(2009, 1, 44, 18, 31, 30), tz)); // day
+ EXPECT_EQ(tp, convert(civil_second(2009, 2, 12, 42, 31, 30), tz)); // hour
+ EXPECT_EQ(tp, convert(civil_second(2009, 2, 13, 17, 91, 30), tz)); // minute
+ EXPECT_EQ(tp, convert(civil_second(2009, 2, 13, 18, 30, 90), tz)); // second
+}
+
+// NOTE: Run this with -ftrapv to detect overflow problems.
+TEST(MakeTime, SysSecondsLimits) {
+ const char RFC3339[] = "%Y-%m-%d%ET%H:%M:%S%Ez";
+ const time_zone utc = utc_time_zone();
+ const time_zone east = fixed_time_zone(chrono::hours(14));
+ const time_zone west = fixed_time_zone(-chrono::hours(14));
+ time_point<absl::time_internal::cctz::seconds> tp;
+
+ // Approach the maximal time_point<cctz::seconds> value from below.
+ tp = convert(civil_second(292277026596, 12, 4, 15, 30, 6), utc);
+ EXPECT_EQ("292277026596-12-04T15:30:06+00:00", format(RFC3339, tp, utc));
+ tp = convert(civil_second(292277026596, 12, 4, 15, 30, 7), utc);
+ EXPECT_EQ("292277026596-12-04T15:30:07+00:00", format(RFC3339, tp, utc));
+ EXPECT_EQ(time_point<absl::time_internal::cctz::seconds>::max(), tp);
+ tp = convert(civil_second(292277026596, 12, 4, 15, 30, 8), utc);
+ EXPECT_EQ(time_point<absl::time_internal::cctz::seconds>::max(), tp);
+ tp = convert(civil_second::max(), utc);
+ EXPECT_EQ(time_point<absl::time_internal::cctz::seconds>::max(), tp);
+
+ // Checks that we can also get the maximal value for a far-east zone.
+ tp = convert(civil_second(292277026596, 12, 5, 5, 30, 7), east);
+ EXPECT_EQ("292277026596-12-05T05:30:07+14:00", format(RFC3339, tp, east));
+ EXPECT_EQ(time_point<absl::time_internal::cctz::seconds>::max(), tp);
+ tp = convert(civil_second(292277026596, 12, 5, 5, 30, 8), east);
+ EXPECT_EQ(time_point<absl::time_internal::cctz::seconds>::max(), tp);
+ tp = convert(civil_second::max(), east);
+ EXPECT_EQ(time_point<absl::time_internal::cctz::seconds>::max(), tp);
+
+ // Checks that we can also get the maximal value for a far-west zone.
+ tp = convert(civil_second(292277026596, 12, 4, 1, 30, 7), west);
+ EXPECT_EQ("292277026596-12-04T01:30:07-14:00", format(RFC3339, tp, west));
+ EXPECT_EQ(time_point<absl::time_internal::cctz::seconds>::max(), tp);
+ tp = convert(civil_second(292277026596, 12, 4, 7, 30, 8), west);
+ EXPECT_EQ(time_point<absl::time_internal::cctz::seconds>::max(), tp);
+ tp = convert(civil_second::max(), west);
+ EXPECT_EQ(time_point<absl::time_internal::cctz::seconds>::max(), tp);
+
+ // Approach the minimal time_point<cctz::seconds> value from above.
+ tp = convert(civil_second(-292277022657, 1, 27, 8, 29, 53), utc);
+ EXPECT_EQ("-292277022657-01-27T08:29:53+00:00", format(RFC3339, tp, utc));
+ tp = convert(civil_second(-292277022657, 1, 27, 8, 29, 52), utc);
+ EXPECT_EQ("-292277022657-01-27T08:29:52+00:00", format(RFC3339, tp, utc));
+ EXPECT_EQ(time_point<absl::time_internal::cctz::seconds>::min(), tp);
+ tp = convert(civil_second(-292277022657, 1, 27, 8, 29, 51), utc);
+ EXPECT_EQ(time_point<absl::time_internal::cctz::seconds>::min(), tp);
+ tp = convert(civil_second::min(), utc);
+ EXPECT_EQ(time_point<absl::time_internal::cctz::seconds>::min(), tp);
+
+ // Checks that we can also get the minimal value for a far-east zone.
+ tp = convert(civil_second(-292277022657, 1, 27, 22, 29, 52), east);
+ EXPECT_EQ("-292277022657-01-27T22:29:52+14:00", format(RFC3339, tp, east));
+ EXPECT_EQ(time_point<absl::time_internal::cctz::seconds>::min(), tp);
+ tp = convert(civil_second(-292277022657, 1, 27, 22, 29, 51), east);
+ EXPECT_EQ(time_point<absl::time_internal::cctz::seconds>::min(), tp);
+ tp = convert(civil_second::min(), east);
+ EXPECT_EQ(time_point<absl::time_internal::cctz::seconds>::min(), tp);
+
+ // Checks that we can also get the minimal value for a far-west zone.
+ tp = convert(civil_second(-292277022657, 1, 26, 18, 29, 52), west);
+ EXPECT_EQ("-292277022657-01-26T18:29:52-14:00", format(RFC3339, tp, west));
+ EXPECT_EQ(time_point<absl::time_internal::cctz::seconds>::min(), tp);
+ tp = convert(civil_second(-292277022657, 1, 26, 18, 29, 51), west);
+ EXPECT_EQ(time_point<absl::time_internal::cctz::seconds>::min(), tp);
+ tp = convert(civil_second::min(), west);
+ EXPECT_EQ(time_point<absl::time_internal::cctz::seconds>::min(), tp);
+
+ // Some similar checks for the "libc" time-zone implementation.
+ if (sizeof(std::time_t) >= 8) {
+ // Checks that "tm_year + 1900", as used by the "libc" implementation,
+ // can produce year values beyond the range on an int without overflow.
+#if defined(_WIN32) || defined(_WIN64)
+ // localtime_s() and gmtime_s() don't believe in years outside [1970:3000].
+#else
+ const time_zone cut = LoadZone("libc:UTC");
+ const year_t max_tm_year = year_t{std::numeric_limits<int>::max()} + 1900;
+ tp = convert(civil_second(max_tm_year, 12, 31, 23, 59, 59), cut);
+#if defined(__FreeBSD__) || defined(__OpenBSD__)
+ // The BSD gmtime_r() fails on extreme positive tm_year values.
+#else
+ EXPECT_EQ("2147485547-12-31T23:59:59+00:00", format(RFC3339, tp, cut));
+#endif
+ const year_t min_tm_year = year_t{std::numeric_limits<int>::min()} + 1900;
+ tp = convert(civil_second(min_tm_year, 1, 1, 0, 0, 0), cut);
+ EXPECT_EQ("-2147481748-01-01T00:00:00+00:00", format(RFC3339, tp, cut));
+#endif
+ }
+}
+
+TEST(MakeTime, LocalTimeLibC) {
+ // Checks that cctz and libc agree on transition points in [1970:2037].
+ //
+ // We limit this test case to environments where:
+ // 1) we know how to change the time zone used by localtime()/mktime(),
+ // 2) cctz and localtime()/mktime() will use similar-enough tzdata, and
+ // 3) we have some idea about how mktime() behaves during transitions.
+#if defined(__linux__) && !defined(__ANDROID__)
+ const char* const ep = getenv("TZ");
+ std::string tz_name = (ep != nullptr) ? ep : "";
+ for (const char* const* np = kTimeZoneNames; *np != nullptr; ++np) {
+ ASSERT_EQ(0, setenv("TZ", *np, 1)); // change what "localtime" means
+ const auto zi = local_time_zone();
+ const auto lc = LoadZone("libc:localtime");
+ time_zone::civil_transition transition;
+ for (auto tp = zi.lookup(civil_second()).trans;
+ zi.next_transition(tp, &transition);
+ tp = zi.lookup(transition.to).trans) {
+ const auto fcl = zi.lookup(transition.from);
+ const auto tcl = zi.lookup(transition.to);
+ civil_second cs; // compare cs in zi and lc
+ if (fcl.kind == time_zone::civil_lookup::UNIQUE) {
+ if (tcl.kind == time_zone::civil_lookup::UNIQUE) {
+ // Both unique; must be an is_dst or abbr change.
+ ASSERT_EQ(transition.from, transition.to);
+ const auto trans = fcl.trans;
+ const auto tal = zi.lookup(trans);
+ const auto tprev = trans - absl::time_internal::cctz::seconds(1);
+ const auto pal = zi.lookup(tprev);
+ if (pal.is_dst == tal.is_dst) {
+ ASSERT_STRNE(pal.abbr, tal.abbr);
+ }
+ continue;
+ }
+ ASSERT_EQ(time_zone::civil_lookup::REPEATED, tcl.kind);
+ cs = transition.to;
+ } else {
+ ASSERT_EQ(time_zone::civil_lookup::UNIQUE, tcl.kind);
+ ASSERT_EQ(time_zone::civil_lookup::SKIPPED, fcl.kind);
+ cs = transition.from;
+ }
+ if (cs.year() > 2037) break; // limit test time (and to 32-bit time_t)
+ const auto cl_zi = zi.lookup(cs);
+ if (zi.lookup(cl_zi.pre).is_dst == zi.lookup(cl_zi.post).is_dst) {
+ // The "libc" implementation cannot correctly classify transitions
+ // that don't change the "tm_isdst" flag. In Europe/Volgograd, for
+ // example, there is a SKIPPED transition from +03 to +04 with dst=F
+ // on both sides ...
+ // 1540681199 = 2018-10-28 01:59:59 +03:00:00 [dst=F off=10800]
+ // 1540681200 = 2018-10-28 03:00:00 +04:00:00 [dst=F off=14400]
+ // but std::mktime(2018-10-28 02:00:00, tm_isdst=0) fails, unlike,
+ // say, the similar Europe/Chisinau transition from +02 to +03 ...
+ // 1521935999 = 2018-03-25 01:59:59 +02:00:00 [dst=F off=7200]
+ // 1521936000 = 2018-03-25 03:00:00 +03:00:00 [dst=T off=10800]
+ // where std::mktime(2018-03-25 02:00:00, tm_isdst=0) succeeds and
+ // returns 1521936000.
+ continue;
+ }
+ if (cs == civil_second(2037, 10, 4, 2, 0, 0)) {
+ const std::string tzname = *np;
+ if (tzname == "Africa/Casablanca" || tzname == "Africa/El_Aaiun") {
+ // The "libc" implementation gets this transition wrong (at least
+ // until 2018g when it was removed), returning an offset of 3600
+ // instead of 0. TODO: Revert this when 2018g is ubiquitous.
+ continue;
+ }
+ }
+ const auto cl_lc = lc.lookup(cs);
+ SCOPED_TRACE(testing::Message() << "For " << cs << " in " << *np);
+ EXPECT_EQ(cl_zi.kind, cl_lc.kind);
+ EXPECT_EQ(cl_zi.pre, cl_lc.pre);
+ EXPECT_EQ(cl_zi.trans, cl_lc.trans);
+ EXPECT_EQ(cl_zi.post, cl_lc.post);
+ }
+ }
+ if (ep == nullptr) {
+ ASSERT_EQ(0, unsetenv("TZ"));
+ } else {
+ ASSERT_EQ(0, setenv("TZ", tz_name.c_str(), 1));
+ }
+#endif
+}
+
+TEST(NextTransition, UTC) {
+ const auto tz = utc_time_zone();
+ time_zone::civil_transition trans;
+
+ auto tp = time_point<absl::time_internal::cctz::seconds>::min();
+ EXPECT_FALSE(tz.next_transition(tp, &trans));
+
+ tp = time_point<absl::time_internal::cctz::seconds>::max();
+ EXPECT_FALSE(tz.next_transition(tp, &trans));
+}
+
+TEST(PrevTransition, UTC) {
+ const auto tz = utc_time_zone();
+ time_zone::civil_transition trans;
+
+ auto tp = time_point<absl::time_internal::cctz::seconds>::max();
+ EXPECT_FALSE(tz.prev_transition(tp, &trans));
+
+ tp = time_point<absl::time_internal::cctz::seconds>::min();
+ EXPECT_FALSE(tz.prev_transition(tp, &trans));
+}
+
+TEST(NextTransition, AmericaNewYork) {
+ const auto tz = LoadZone("America/New_York");
+ time_zone::civil_transition trans;
+
+ auto tp = convert(civil_second(2018, 6, 30, 0, 0, 0), tz);
+ EXPECT_TRUE(tz.next_transition(tp, &trans));
+ EXPECT_EQ(civil_second(2018, 11, 4, 2, 0, 0), trans.from);
+ EXPECT_EQ(civil_second(2018, 11, 4, 1, 0, 0), trans.to);
+
+ tp = time_point<absl::time_internal::cctz::seconds>::max();
+ EXPECT_FALSE(tz.next_transition(tp, &trans));
+
+ tp = time_point<absl::time_internal::cctz::seconds>::min();
+ EXPECT_TRUE(tz.next_transition(tp, &trans));
+ if (trans.from == civil_second(1918, 3, 31, 2, 0, 0)) {
+ // It looks like the tzdata is only 32 bit (probably macOS),
+ // which bottoms out at 1901-12-13T20:45:52+00:00.
+ EXPECT_EQ(civil_second(1918, 3, 31, 3, 0, 0), trans.to);
+ } else {
+ EXPECT_EQ(civil_second(1883, 11, 18, 12, 3, 58), trans.from);
+ EXPECT_EQ(civil_second(1883, 11, 18, 12, 0, 0), trans.to);
+ }
+}
+
+TEST(PrevTransition, AmericaNewYork) {
+ const auto tz = LoadZone("America/New_York");
+ time_zone::civil_transition trans;
+
+ auto tp = convert(civil_second(2018, 6, 30, 0, 0, 0), tz);
+ EXPECT_TRUE(tz.prev_transition(tp, &trans));
+ EXPECT_EQ(civil_second(2018, 3, 11, 2, 0, 0), trans.from);
+ EXPECT_EQ(civil_second(2018, 3, 11, 3, 0, 0), trans.to);
+
+ tp = time_point<absl::time_internal::cctz::seconds>::min();
+ EXPECT_FALSE(tz.prev_transition(tp, &trans));
+
+ tp = time_point<absl::time_internal::cctz::seconds>::max();
+ EXPECT_TRUE(tz.prev_transition(tp, &trans));
+ // We have a transition but we don't know which one.
+}
+
+TEST(TimeZoneEdgeCase, AmericaNewYork) {
+ const time_zone tz = LoadZone("America/New_York");
+
+ // Spring 1:59:59 -> 3:00:00
+ auto tp = convert(civil_second(2013, 3, 10, 1, 59, 59), tz);
+ ExpectTime(tp, tz, 2013, 3, 10, 1, 59, 59, -5 * 3600, false, "EST");
+ tp += absl::time_internal::cctz::seconds(1);
+ ExpectTime(tp, tz, 2013, 3, 10, 3, 0, 0, -4 * 3600, true, "EDT");
+
+ // Fall 1:59:59 -> 1:00:00
+ tp = convert(civil_second(2013, 11, 3, 1, 59, 59), tz);
+ ExpectTime(tp, tz, 2013, 11, 3, 1, 59, 59, -4 * 3600, true, "EDT");
+ tp += absl::time_internal::cctz::seconds(1);
+ ExpectTime(tp, tz, 2013, 11, 3, 1, 0, 0, -5 * 3600, false, "EST");
+}
+
+TEST(TimeZoneEdgeCase, AmericaLosAngeles) {
+ const time_zone tz = LoadZone("America/Los_Angeles");
+
+ // Spring 1:59:59 -> 3:00:00
+ auto tp = convert(civil_second(2013, 3, 10, 1, 59, 59), tz);
+ ExpectTime(tp, tz, 2013, 3, 10, 1, 59, 59, -8 * 3600, false, "PST");
+ tp += absl::time_internal::cctz::seconds(1);
+ ExpectTime(tp, tz, 2013, 3, 10, 3, 0, 0, -7 * 3600, true, "PDT");
+
+ // Fall 1:59:59 -> 1:00:00
+ tp = convert(civil_second(2013, 11, 3, 1, 59, 59), tz);
+ ExpectTime(tp, tz, 2013, 11, 3, 1, 59, 59, -7 * 3600, true, "PDT");
+ tp += absl::time_internal::cctz::seconds(1);
+ ExpectTime(tp, tz, 2013, 11, 3, 1, 0, 0, -8 * 3600, false, "PST");
+}
+
+TEST(TimeZoneEdgeCase, ArizonaNoTransition) {
+ const time_zone tz = LoadZone("America/Phoenix");
+
+ // No transition in Spring.
+ auto tp = convert(civil_second(2013, 3, 10, 1, 59, 59), tz);
+ ExpectTime(tp, tz, 2013, 3, 10, 1, 59, 59, -7 * 3600, false, "MST");
+ tp += absl::time_internal::cctz::seconds(1);
+ ExpectTime(tp, tz, 2013, 3, 10, 2, 0, 0, -7 * 3600, false, "MST");
+
+ // No transition in Fall.
+ tp = convert(civil_second(2013, 11, 3, 1, 59, 59), tz);
+ ExpectTime(tp, tz, 2013, 11, 3, 1, 59, 59, -7 * 3600, false, "MST");
+ tp += absl::time_internal::cctz::seconds(1);
+ ExpectTime(tp, tz, 2013, 11, 3, 2, 0, 0, -7 * 3600, false, "MST");
+}
+
+TEST(TimeZoneEdgeCase, AsiaKathmandu) {
+ const time_zone tz = LoadZone("Asia/Kathmandu");
+
+ // A non-DST offset change from +0530 to +0545
+ //
+ // 504901799 == Tue, 31 Dec 1985 23:59:59 +0530 (+0530)
+ // 504901800 == Wed, 1 Jan 1986 00:15:00 +0545 (+0545)
+ auto tp = convert(civil_second(1985, 12, 31, 23, 59, 59), tz);
+ ExpectTime(tp, tz, 1985, 12, 31, 23, 59, 59, 5.5 * 3600, false, "+0530");
+ tp += absl::time_internal::cctz::seconds(1);
+ ExpectTime(tp, tz, 1986, 1, 1, 0, 15, 0, 5.75 * 3600, false, "+0545");
+}
+
+TEST(TimeZoneEdgeCase, PacificChatham) {
+ const time_zone tz = LoadZone("Pacific/Chatham");
+
+ // One-hour DST offset changes, but at atypical values
+ //
+ // 1365256799 == Sun, 7 Apr 2013 03:44:59 +1345 (+1345)
+ // 1365256800 == Sun, 7 Apr 2013 02:45:00 +1245 (+1245)
+ auto tp = convert(civil_second(2013, 4, 7, 3, 44, 59), tz);
+ ExpectTime(tp, tz, 2013, 4, 7, 3, 44, 59, 13.75 * 3600, true, "+1345");
+ tp += absl::time_internal::cctz::seconds(1);
+ ExpectTime(tp, tz, 2013, 4, 7, 2, 45, 0, 12.75 * 3600, false, "+1245");
+
+ // 1380376799 == Sun, 29 Sep 2013 02:44:59 +1245 (+1245)
+ // 1380376800 == Sun, 29 Sep 2013 03:45:00 +1345 (+1345)
+ tp = convert(civil_second(2013, 9, 29, 2, 44, 59), tz);
+ ExpectTime(tp, tz, 2013, 9, 29, 2, 44, 59, 12.75 * 3600, false, "+1245");
+ tp += absl::time_internal::cctz::seconds(1);
+ ExpectTime(tp, tz, 2013, 9, 29, 3, 45, 0, 13.75 * 3600, true, "+1345");
+}
+
+TEST(TimeZoneEdgeCase, AustraliaLordHowe) {
+ const time_zone tz = LoadZone("Australia/Lord_Howe");
+
+ // Half-hour DST offset changes
+ //
+ // 1365260399 == Sun, 7 Apr 2013 01:59:59 +1100 (+11)
+ // 1365260400 == Sun, 7 Apr 2013 01:30:00 +1030 (+1030)
+ auto tp = convert(civil_second(2013, 4, 7, 1, 59, 59), tz);
+ ExpectTime(tp, tz, 2013, 4, 7, 1, 59, 59, 11 * 3600, true, "+11");
+ tp += absl::time_internal::cctz::seconds(1);
+ ExpectTime(tp, tz, 2013, 4, 7, 1, 30, 0, 10.5 * 3600, false, "+1030");
+
+ // 1380986999 == Sun, 6 Oct 2013 01:59:59 +1030 (+1030)
+ // 1380987000 == Sun, 6 Oct 2013 02:30:00 +1100 (+11)
+ tp = convert(civil_second(2013, 10, 6, 1, 59, 59), tz);
+ ExpectTime(tp, tz, 2013, 10, 6, 1, 59, 59, 10.5 * 3600, false, "+1030");
+ tp += absl::time_internal::cctz::seconds(1);
+ ExpectTime(tp, tz, 2013, 10, 6, 2, 30, 0, 11 * 3600, true, "+11");
+}
+
+TEST(TimeZoneEdgeCase, PacificApia) {
+ const time_zone tz = LoadZone("Pacific/Apia");
+
+ // At the end of December 2011, Samoa jumped forward by one day,
+ // skipping 30 December from the local calendar, when the nation
+ // moved to the west of the International Date Line.
+ //
+ // A one-day, non-DST offset change
+ //
+ // 1325239199 == Thu, 29 Dec 2011 23:59:59 -1000 (-10)
+ // 1325239200 == Sat, 31 Dec 2011 00:00:00 +1400 (+14)
+ auto tp = convert(civil_second(2011, 12, 29, 23, 59, 59), tz);
+ ExpectTime(tp, tz, 2011, 12, 29, 23, 59, 59, -10 * 3600, true, "-10");
+ EXPECT_EQ(363, get_yearday(convert(tp, tz)));
+ tp += absl::time_internal::cctz::seconds(1);
+ ExpectTime(tp, tz, 2011, 12, 31, 0, 0, 0, 14 * 3600, true, "+14");
+ EXPECT_EQ(365, get_yearday(convert(tp, tz)));
+}
+
+TEST(TimeZoneEdgeCase, AfricaCairo) {
+ const time_zone tz = LoadZone("Africa/Cairo");
+
+ if (VersionCmp(tz, "2014c") >= 0) {
+ // An interesting case of midnight not existing.
+ //
+ // 1400191199 == Thu, 15 May 2014 23:59:59 +0200 (EET)
+ // 1400191200 == Fri, 16 May 2014 01:00:00 +0300 (EEST)
+ auto tp = convert(civil_second(2014, 5, 15, 23, 59, 59), tz);
+ ExpectTime(tp, tz, 2014, 5, 15, 23, 59, 59, 2 * 3600, false, "EET");
+ tp += absl::time_internal::cctz::seconds(1);
+ ExpectTime(tp, tz, 2014, 5, 16, 1, 0, 0, 3 * 3600, true, "EEST");
+ }
+}
+
+TEST(TimeZoneEdgeCase, AfricaMonrovia) {
+ const time_zone tz = LoadZone("Africa/Monrovia");
+
+ if (VersionCmp(tz, "2017b") >= 0) {
+ // Strange offset change -00:44:30 -> +00:00:00 (non-DST)
+ //
+ // 63593069 == Thu, 6 Jan 1972 23:59:59 -0044 (MMT)
+ // 63593070 == Fri, 7 Jan 1972 00:44:30 +0000 (GMT)
+ auto tp = convert(civil_second(1972, 1, 6, 23, 59, 59), tz);
+ ExpectTime(tp, tz, 1972, 1, 6, 23, 59, 59, -44.5 * 60, false, "MMT");
+ tp += absl::time_internal::cctz::seconds(1);
+ ExpectTime(tp, tz, 1972, 1, 7, 0, 44, 30, 0 * 60, false, "GMT");
+ }
+}
+
+TEST(TimeZoneEdgeCase, AmericaJamaica) {
+ // Jamaica discontinued DST transitions in 1983, and is now at a
+ // constant -0500. This makes it an interesting edge-case target.
+ // Note that the 32-bit times used in a (tzh_version == 0) zoneinfo
+ // file cannot represent the abbreviation-only transition of 1890,
+ // so we ignore the abbreviation by expecting what we received.
+ const time_zone tz = LoadZone("America/Jamaica");
+
+ // Before the first transition.
+ if (!tz.version().empty() && VersionCmp(tz, "2018d") >= 0) {
+ // We avoid the expectations on the -18430 offset below unless we are
+ // certain we have commit 907241e (Fix off-by-1 error for Jamaica and
+ // T&C before 1913) from 2018d. TODO: Remove the "version() not empty"
+ // part when 2018d is generally available from /usr/share/zoneinfo.
+ auto tp = convert(civil_second(1889, 12, 31, 0, 0, 0), tz);
+ ExpectTime(tp, tz, 1889, 12, 31, 0, 0, 0, -18430, false,
+ tz.lookup(tp).abbr);
+
+ // Over the first (abbreviation-change only) transition.
+ // -2524503170 == Tue, 31 Dec 1889 23:59:59 -0507 (LMT)
+ // -2524503169 == Wed, 1 Jan 1890 00:00:00 -0507 (KMT)
+ tp = convert(civil_second(1889, 12, 31, 23, 59, 59), tz);
+ ExpectTime(tp, tz, 1889, 12, 31, 23, 59, 59, -18430, false,
+ tz.lookup(tp).abbr);
+ tp += absl::time_internal::cctz::seconds(1);
+ ExpectTime(tp, tz, 1890, 1, 1, 0, 0, 0, -18430, false, "KMT");
+ }
+
+ // Over the last (DST) transition.
+ // 436341599 == Sun, 30 Oct 1983 01:59:59 -0400 (EDT)
+ // 436341600 == Sun, 30 Oct 1983 01:00:00 -0500 (EST)
+ auto tp = convert(civil_second(1983, 10, 30, 1, 59, 59), tz);
+ ExpectTime(tp, tz, 1983, 10, 30, 1, 59, 59, -4 * 3600, true, "EDT");
+ tp += absl::time_internal::cctz::seconds(1);
+ ExpectTime(tp, tz, 1983, 10, 30, 1, 0, 0, -5 * 3600, false, "EST");
+
+ // After the last transition.
+ tp = convert(civil_second(1983, 12, 31, 23, 59, 59), tz);
+ ExpectTime(tp, tz, 1983, 12, 31, 23, 59, 59, -5 * 3600, false, "EST");
+}
+
+TEST(TimeZoneEdgeCase, WET) {
+ // Cover some non-existent times within forward transitions.
+ const time_zone tz = LoadZone("WET");
+
+ // Before the first transition.
+ auto tp = convert(civil_second(1977, 1, 1, 0, 0, 0), tz);
+ ExpectTime(tp, tz, 1977, 1, 1, 0, 0, 0, 0, false, "WET");
+
+ // Over the first transition.
+ // 228877199 == Sun, 3 Apr 1977 00:59:59 +0000 (WET)
+ // 228877200 == Sun, 3 Apr 1977 02:00:00 +0100 (WEST)
+ tp = convert(civil_second(1977, 4, 3, 0, 59, 59), tz);
+ ExpectTime(tp, tz, 1977, 4, 3, 0, 59, 59, 0, false, "WET");
+ tp += absl::time_internal::cctz::seconds(1);
+ ExpectTime(tp, tz, 1977, 4, 3, 2, 0, 0, 1 * 3600, true, "WEST");
+
+ // A non-existent time within the first transition.
+ time_zone::civil_lookup cl1 = tz.lookup(civil_second(1977, 4, 3, 1, 15, 0));
+ EXPECT_EQ(time_zone::civil_lookup::SKIPPED, cl1.kind);
+ ExpectTime(cl1.pre, tz, 1977, 4, 3, 2, 15, 0, 1 * 3600, true, "WEST");
+ ExpectTime(cl1.trans, tz, 1977, 4, 3, 2, 0, 0, 1 * 3600, true, "WEST");
+ ExpectTime(cl1.post, tz, 1977, 4, 3, 0, 15, 0, 0 * 3600, false, "WET");
+
+ // A non-existent time within the second forward transition.
+ time_zone::civil_lookup cl2 = tz.lookup(civil_second(1978, 4, 2, 1, 15, 0));
+ EXPECT_EQ(time_zone::civil_lookup::SKIPPED, cl2.kind);
+ ExpectTime(cl2.pre, tz, 1978, 4, 2, 2, 15, 0, 1 * 3600, true, "WEST");
+ ExpectTime(cl2.trans, tz, 1978, 4, 2, 2, 0, 0, 1 * 3600, true, "WEST");
+ ExpectTime(cl2.post, tz, 1978, 4, 2, 0, 15, 0, 0 * 3600, false, "WET");
+}
+
+TEST(TimeZoneEdgeCase, FixedOffsets) {
+ const time_zone gmtm5 = LoadZone("Etc/GMT+5"); // -0500
+ auto tp = convert(civil_second(1970, 1, 1, 0, 0, 0), gmtm5);
+ ExpectTime(tp, gmtm5, 1970, 1, 1, 0, 0, 0, -5 * 3600, false, "-05");
+ EXPECT_EQ(chrono::system_clock::from_time_t(5 * 3600), tp);
+
+ const time_zone gmtp5 = LoadZone("Etc/GMT-5"); // +0500
+ tp = convert(civil_second(1970, 1, 1, 0, 0, 0), gmtp5);
+ ExpectTime(tp, gmtp5, 1970, 1, 1, 0, 0, 0, 5 * 3600, false, "+05");
+ EXPECT_EQ(chrono::system_clock::from_time_t(-5 * 3600), tp);
+}
+
+TEST(TimeZoneEdgeCase, NegativeYear) {
+ // Tests transition from year 0 (aka 1BCE) to year -1.
+ const time_zone tz = utc_time_zone();
+ auto tp = convert(civil_second(0, 1, 1, 0, 0, 0), tz);
+ ExpectTime(tp, tz, 0, 1, 1, 0, 0, 0, 0 * 3600, false, "UTC");
+ EXPECT_EQ(weekday::saturday, get_weekday(convert(tp, tz)));
+ tp -= absl::time_internal::cctz::seconds(1);
+ ExpectTime(tp, tz, -1, 12, 31, 23, 59, 59, 0 * 3600, false, "UTC");
+ EXPECT_EQ(weekday::friday, get_weekday(convert(tp, tz)));
+}
+
+TEST(TimeZoneEdgeCase, UTC32bitLimit) {
+ const time_zone tz = utc_time_zone();
+
+ // Limits of signed 32-bit time_t
+ //
+ // 2147483647 == Tue, 19 Jan 2038 03:14:07 +0000 (UTC)
+ // 2147483648 == Tue, 19 Jan 2038 03:14:08 +0000 (UTC)
+ auto tp = convert(civil_second(2038, 1, 19, 3, 14, 7), tz);
+ ExpectTime(tp, tz, 2038, 1, 19, 3, 14, 7, 0 * 3600, false, "UTC");
+ tp += absl::time_internal::cctz::seconds(1);
+ ExpectTime(tp, tz, 2038, 1, 19, 3, 14, 8, 0 * 3600, false, "UTC");
+}
+
+TEST(TimeZoneEdgeCase, UTC5DigitYear) {
+ const time_zone tz = utc_time_zone();
+
+ // Rollover to 5-digit year
+ //
+ // 253402300799 == Fri, 31 Dec 9999 23:59:59 +0000 (UTC)
+ // 253402300800 == Sat, 1 Jan 1000 00:00:00 +0000 (UTC)
+ auto tp = convert(civil_second(9999, 12, 31, 23, 59, 59), tz);
+ ExpectTime(tp, tz, 9999, 12, 31, 23, 59, 59, 0 * 3600, false, "UTC");
+ tp += absl::time_internal::cctz::seconds(1);
+ ExpectTime(tp, tz, 10000, 1, 1, 0, 0, 0, 0 * 3600, false, "UTC");
+}
+
+} // namespace cctz
+} // namespace time_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/time/internal/cctz/src/time_zone_posix.cc b/third_party/abseil/src/absl/time/internal/cctz/src/time_zone_posix.cc
new file mode 100644
index 0000000..5cdd09e
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/src/time_zone_posix.cc
@@ -0,0 +1,159 @@
+// Copyright 2016 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "time_zone_posix.h"
+
+#include <cstddef>
+#include <cstring>
+#include <limits>
+#include <string>
+
+#include "absl/base/config.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace time_internal {
+namespace cctz {
+
+namespace {
+
+const char kDigits[] = "0123456789";
+
+const char* ParseInt(const char* p, int min, int max, int* vp) {
+ int value = 0;
+ const char* op = p;
+ const int kMaxInt = std::numeric_limits<int>::max();
+ for (; const char* dp = strchr(kDigits, *p); ++p) {
+ int d = static_cast<int>(dp - kDigits);
+ if (d >= 10) break; // '\0'
+ if (value > kMaxInt / 10) return nullptr;
+ value *= 10;
+ if (value > kMaxInt - d) return nullptr;
+ value += d;
+ }
+ if (p == op || value < min || value > max) return nullptr;
+ *vp = value;
+ return p;
+}
+
+// abbr = <.*?> | [^-+,\d]{3,}
+const char* ParseAbbr(const char* p, std::string* abbr) {
+ const char* op = p;
+ if (*p == '<') { // special zoneinfo <...> form
+ while (*++p != '>') {
+ if (*p == '\0') return nullptr;
+ }
+ abbr->assign(op + 1, static_cast<std::size_t>(p - op) - 1);
+ return ++p;
+ }
+ while (*p != '\0') {
+ if (strchr("-+,", *p)) break;
+ if (strchr(kDigits, *p)) break;
+ ++p;
+ }
+ if (p - op < 3) return nullptr;
+ abbr->assign(op, static_cast<std::size_t>(p - op));
+ return p;
+}
+
+// offset = [+|-]hh[:mm[:ss]] (aggregated into single seconds value)
+const char* ParseOffset(const char* p, int min_hour, int max_hour, int sign,
+ std::int_fast32_t* offset) {
+ if (p == nullptr) return nullptr;
+ if (*p == '+' || *p == '-') {
+ if (*p++ == '-') sign = -sign;
+ }
+ int hours = 0;
+ int minutes = 0;
+ int seconds = 0;
+
+ p = ParseInt(p, min_hour, max_hour, &hours);
+ if (p == nullptr) return nullptr;
+ if (*p == ':') {
+ p = ParseInt(p + 1, 0, 59, &minutes);
+ if (p == nullptr) return nullptr;
+ if (*p == ':') {
+ p = ParseInt(p + 1, 0, 59, &seconds);
+ if (p == nullptr) return nullptr;
+ }
+ }
+ *offset = sign * ((((hours * 60) + minutes) * 60) + seconds);
+ return p;
+}
+
+// datetime = ( Jn | n | Mm.w.d ) [ / offset ]
+const char* ParseDateTime(const char* p, PosixTransition* res) {
+ if (p != nullptr && *p == ',') {
+ if (*++p == 'M') {
+ int month = 0;
+ if ((p = ParseInt(p + 1, 1, 12, &month)) != nullptr && *p == '.') {
+ int week = 0;
+ if ((p = ParseInt(p + 1, 1, 5, &week)) != nullptr && *p == '.') {
+ int weekday = 0;
+ if ((p = ParseInt(p + 1, 0, 6, &weekday)) != nullptr) {
+ res->date.fmt = PosixTransition::M;
+ res->date.m.month = static_cast<std::int_fast8_t>(month);
+ res->date.m.week = static_cast<std::int_fast8_t>(week);
+ res->date.m.weekday = static_cast<std::int_fast8_t>(weekday);
+ }
+ }
+ }
+ } else if (*p == 'J') {
+ int day = 0;
+ if ((p = ParseInt(p + 1, 1, 365, &day)) != nullptr) {
+ res->date.fmt = PosixTransition::J;
+ res->date.j.day = static_cast<std::int_fast16_t>(day);
+ }
+ } else {
+ int day = 0;
+ if ((p = ParseInt(p, 0, 365, &day)) != nullptr) {
+ res->date.fmt = PosixTransition::N;
+ res->date.n.day = static_cast<std::int_fast16_t>(day);
+ }
+ }
+ }
+ if (p != nullptr) {
+ res->time.offset = 2 * 60 * 60; // default offset is 02:00:00
+ if (*p == '/') p = ParseOffset(p + 1, -167, 167, 1, &res->time.offset);
+ }
+ return p;
+}
+
+} // namespace
+
+// spec = std offset [ dst [ offset ] , datetime , datetime ]
+bool ParsePosixSpec(const std::string& spec, PosixTimeZone* res) {
+ const char* p = spec.c_str();
+ if (*p == ':') return false;
+
+ p = ParseAbbr(p, &res->std_abbr);
+ p = ParseOffset(p, 0, 24, -1, &res->std_offset);
+ if (p == nullptr) return false;
+ if (*p == '\0') return true;
+
+ p = ParseAbbr(p, &res->dst_abbr);
+ if (p == nullptr) return false;
+ res->dst_offset = res->std_offset + (60 * 60); // default
+ if (*p != ',') p = ParseOffset(p, 0, 24, -1, &res->dst_offset);
+
+ p = ParseDateTime(p, &res->dst_start);
+ p = ParseDateTime(p, &res->dst_end);
+
+ return p != nullptr && *p == '\0';
+}
+
+} // namespace cctz
+} // namespace time_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/time/internal/cctz/src/time_zone_posix.h b/third_party/abseil/src/absl/time/internal/cctz/src/time_zone_posix.h
new file mode 100644
index 0000000..0cf2905
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/src/time_zone_posix.h
@@ -0,0 +1,132 @@
+// Copyright 2016 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Parsing of a POSIX zone spec as described in the TZ part of section 8.3 in
+// http://pubs.opengroup.org/onlinepubs/009695399/basedefs/xbd_chap08.html.
+//
+// The current POSIX spec for America/Los_Angeles is "PST8PDT,M3.2.0,M11.1.0",
+// which would be broken down as ...
+//
+// PosixTimeZone {
+// std_abbr = "PST"
+// std_offset = -28800
+// dst_abbr = "PDT"
+// dst_offset = -25200
+// dst_start = PosixTransition {
+// date {
+// m {
+// month = 3
+// week = 2
+// weekday = 0
+// }
+// }
+// time {
+// offset = 7200
+// }
+// }
+// dst_end = PosixTransition {
+// date {
+// m {
+// month = 11
+// week = 1
+// weekday = 0
+// }
+// }
+// time {
+// offset = 7200
+// }
+// }
+// }
+
+#ifndef ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_POSIX_H_
+#define ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_POSIX_H_
+
+#include <cstdint>
+#include <string>
+
+#include "absl/base/config.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace time_internal {
+namespace cctz {
+
+// The date/time of the transition. The date is specified as either:
+// (J) the Nth day of the year (1 <= N <= 365), excluding leap days, or
+// (N) the Nth day of the year (0 <= N <= 365), including leap days, or
+// (M) the Nth weekday of a month (e.g., the 2nd Sunday in March).
+// The time, specified as a day offset, identifies the particular moment
+// of the transition, and may be negative or >= 24h, and in which case
+// it would take us to another day, and perhaps week, or even month.
+struct PosixTransition {
+ enum DateFormat { J, N, M };
+
+ struct Date {
+ struct NonLeapDay {
+ std::int_fast16_t day; // day of non-leap year [1:365]
+ };
+ struct Day {
+ std::int_fast16_t day; // day of year [0:365]
+ };
+ struct MonthWeekWeekday {
+ std::int_fast8_t month; // month of year [1:12]
+ std::int_fast8_t week; // week of month [1:5] (5==last)
+ std::int_fast8_t weekday; // 0==Sun, ..., 6=Sat
+ };
+
+ DateFormat fmt;
+
+ union {
+ NonLeapDay j;
+ Day n;
+ MonthWeekWeekday m;
+ };
+ };
+
+ struct Time {
+ std::int_fast32_t offset; // seconds before/after 00:00:00
+ };
+
+ Date date;
+ Time time;
+};
+
+// The entirety of a POSIX-string specified time-zone rule. The standard
+// abbreviation and offset are always given. If the time zone includes
+// daylight saving, then the daylight abbrevation is non-empty and the
+// remaining fields are also valid. Note that the start/end transitions
+// are not ordered---in the southern hemisphere the transition to end
+// daylight time occurs first in any particular year.
+struct PosixTimeZone {
+ std::string std_abbr;
+ std::int_fast32_t std_offset;
+
+ std::string dst_abbr;
+ std::int_fast32_t dst_offset;
+ PosixTransition dst_start;
+ PosixTransition dst_end;
+};
+
+// Breaks down a POSIX time-zone specification into its constituent pieces,
+// filling in any missing values (DST offset, or start/end transition times)
+// with the standard-defined defaults. Returns false if the specification
+// could not be parsed (although some fields of *res may have been altered).
+bool ParsePosixSpec(const std::string& spec, PosixTimeZone* res);
+
+} // namespace cctz
+} // namespace time_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_POSIX_H_
diff --git a/third_party/abseil/src/absl/time/internal/cctz/src/tzfile.h b/third_party/abseil/src/absl/time/internal/cctz/src/tzfile.h
new file mode 100644
index 0000000..269fa36
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/src/tzfile.h
@@ -0,0 +1,122 @@
+/* Layout and location of TZif files. */
+
+#ifndef TZFILE_H
+
+#define TZFILE_H
+
+/*
+** This file is in the public domain, so clarified as of
+** 1996-06-05 by Arthur David Olson.
+*/
+
+/*
+** This header is for use ONLY with the time conversion code.
+** There is no guarantee that it will remain unchanged,
+** or that it will remain at all.
+** Do NOT copy it to any system include directory.
+** Thank you!
+*/
+
+/*
+** Information about time zone files.
+*/
+
+#ifndef TZDIR
+#define TZDIR "/usr/share/zoneinfo" /* Time zone object file directory */
+#endif /* !defined TZDIR */
+
+#ifndef TZDEFAULT
+#define TZDEFAULT "/etc/localtime"
+#endif /* !defined TZDEFAULT */
+
+#ifndef TZDEFRULES
+#define TZDEFRULES "posixrules"
+#endif /* !defined TZDEFRULES */
+
+/* See Internet RFC 8536 for more details about the following format. */
+
+/*
+** Each file begins with. . .
+*/
+
+#define TZ_MAGIC "TZif"
+
+struct tzhead {
+ char tzh_magic[4]; /* TZ_MAGIC */
+ char tzh_version[1]; /* '\0' or '2' or '3' as of 2013 */
+ char tzh_reserved[15]; /* reserved; must be zero */
+ char tzh_ttisutcnt[4]; /* coded number of trans. time flags */
+ char tzh_ttisstdcnt[4]; /* coded number of trans. time flags */
+ char tzh_leapcnt[4]; /* coded number of leap seconds */
+ char tzh_timecnt[4]; /* coded number of transition times */
+ char tzh_typecnt[4]; /* coded number of local time types */
+ char tzh_charcnt[4]; /* coded number of abbr. chars */
+};
+
+/*
+** . . .followed by. . .
+**
+** tzh_timecnt (char [4])s coded transition times a la time(2)
+** tzh_timecnt (unsigned char)s types of local time starting at above
+** tzh_typecnt repetitions of
+** one (char [4]) coded UT offset in seconds
+** one (unsigned char) used to set tm_isdst
+** one (unsigned char) that's an abbreviation list index
+** tzh_charcnt (char)s '\0'-terminated zone abbreviations
+** tzh_leapcnt repetitions of
+** one (char [4]) coded leap second transition times
+** one (char [4]) total correction after above
+** tzh_ttisstdcnt (char)s indexed by type; if 1, transition
+** time is standard time, if 0,
+** transition time is local (wall clock)
+** time; if absent, transition times are
+** assumed to be local time
+** tzh_ttisutcnt (char)s indexed by type; if 1, transition
+** time is UT, if 0, transition time is
+** local time; if absent, transition
+** times are assumed to be local time.
+** When this is 1, the corresponding
+** std/wall indicator must also be 1.
+*/
+
+/*
+** If tzh_version is '2' or greater, the above is followed by a second instance
+** of tzhead and a second instance of the data in which each coded transition
+** time uses 8 rather than 4 chars,
+** then a POSIX-TZ-environment-variable-style string for use in handling
+** instants after the last transition time stored in the file
+** (with nothing between the newlines if there is no POSIX representation for
+** such instants).
+**
+** If tz_version is '3' or greater, the above is extended as follows.
+** First, the POSIX TZ string's hour offset may range from -167
+** through 167 as compared to the POSIX-required 0 through 24.
+** Second, its DST start time may be January 1 at 00:00 and its stop
+** time December 31 at 24:00 plus the difference between DST and
+** standard time, indicating DST all year.
+*/
+
+/*
+** In the current implementation, "tzset()" refuses to deal with files that
+** exceed any of the limits below.
+*/
+
+#ifndef TZ_MAX_TIMES
+#define TZ_MAX_TIMES 2000
+#endif /* !defined TZ_MAX_TIMES */
+
+#ifndef TZ_MAX_TYPES
+/* This must be at least 17 for Europe/Samara and Europe/Vilnius. */
+#define TZ_MAX_TYPES 256 /* Limited by what (unsigned char)'s can hold */
+#endif /* !defined TZ_MAX_TYPES */
+
+#ifndef TZ_MAX_CHARS
+#define TZ_MAX_CHARS 50 /* Maximum number of abbreviation characters */
+ /* (limited by what unsigned chars can hold) */
+#endif /* !defined TZ_MAX_CHARS */
+
+#ifndef TZ_MAX_LEAPS
+#define TZ_MAX_LEAPS 50 /* Maximum number of leap second corrections */
+#endif /* !defined TZ_MAX_LEAPS */
+
+#endif /* !defined TZFILE_H */
diff --git a/third_party/abseil/src/absl/time/internal/cctz/src/zone_info_source.cc b/third_party/abseil/src/absl/time/internal/cctz/src/zone_info_source.cc
new file mode 100644
index 0000000..7209533
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/src/zone_info_source.cc
@@ -0,0 +1,116 @@
+// Copyright 2016 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/time/internal/cctz/include/cctz/zone_info_source.h"
+
+#include "absl/base/config.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace time_internal {
+namespace cctz {
+
+// Defined out-of-line to avoid emitting a weak vtable in all TUs.
+ZoneInfoSource::~ZoneInfoSource() {}
+std::string ZoneInfoSource::Version() const { return std::string(); }
+
+} // namespace cctz
+} // namespace time_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace time_internal {
+namespace cctz_extension {
+
+namespace {
+
+// A default for cctz_extension::zone_info_source_factory, which simply
+// defers to the fallback factory.
+std::unique_ptr<absl::time_internal::cctz::ZoneInfoSource> DefaultFactory(
+ const std::string& name,
+ const std::function<
+ std::unique_ptr<absl::time_internal::cctz::ZoneInfoSource>(
+ const std::string& name)>& fallback_factory) {
+ return fallback_factory(name);
+}
+
+} // namespace
+
+// A "weak" definition for cctz_extension::zone_info_source_factory.
+// The user may override this with their own "strong" definition (see
+// zone_info_source.h).
+#if !defined(__has_attribute)
+#define __has_attribute(x) 0
+#endif
+// MinGW is GCC on Windows, so while it asserts __has_attribute(weak), the
+// Windows linker cannot handle that. Nor does the MinGW compiler know how to
+// pass "#pragma comment(linker, ...)" to the Windows linker.
+#if (__has_attribute(weak) || defined(__GNUC__)) && !defined(__MINGW32__)
+ZoneInfoSourceFactory zone_info_source_factory __attribute__((weak)) =
+ DefaultFactory;
+#elif defined(_MSC_VER) && !defined(__MINGW32__) && !defined(_LIBCPP_VERSION)
+extern ZoneInfoSourceFactory zone_info_source_factory;
+extern ZoneInfoSourceFactory default_factory;
+ZoneInfoSourceFactory default_factory = DefaultFactory;
+#if defined(_M_IX86)
+#pragma comment( \
+ linker, \
+ "/alternatename:?zone_info_source_factory@cctz_extension@time_internal@" ABSL_INTERNAL_MANGLED_NS \
+ "@@3P6A?AV?$unique_ptr@VZoneInfoSource@cctz@time_internal@" ABSL_INTERNAL_MANGLED_NS \
+ "@@U?$default_delete@VZoneInfoSource@cctz@time_internal@" ABSL_INTERNAL_MANGLED_NS \
+ "@@@std@@@std@@ABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@" ABSL_INTERNAL_MANGLED_BACKREFERENCE \
+ "@ABV?$function@$$A6A?AV?$unique_ptr@VZoneInfoSource@cctz@time_internal@" ABSL_INTERNAL_MANGLED_NS \
+ "@@U?$default_delete@VZoneInfoSource@cctz@time_internal@" ABSL_INTERNAL_MANGLED_NS \
+ "@@@std@@@std@@ABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@2@@Z@" ABSL_INTERNAL_MANGLED_BACKREFERENCE \
+ "@@ZA=?default_factory@cctz_extension@time_internal@" ABSL_INTERNAL_MANGLED_NS \
+ "@@3P6A?AV?$unique_ptr@VZoneInfoSource@cctz@time_internal@" ABSL_INTERNAL_MANGLED_NS \
+ "@@U?$default_delete@VZoneInfoSource@cctz@time_internal@" ABSL_INTERNAL_MANGLED_NS \
+ "@@@std@@@std@@ABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@" ABSL_INTERNAL_MANGLED_BACKREFERENCE \
+ "@ABV?$function@$$A6A?AV?$unique_ptr@VZoneInfoSource@cctz@time_internal@" ABSL_INTERNAL_MANGLED_NS \
+ "@@U?$default_delete@VZoneInfoSource@cctz@time_internal@" ABSL_INTERNAL_MANGLED_NS \
+ "@@@std@@@std@@ABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@2@@Z@" ABSL_INTERNAL_MANGLED_BACKREFERENCE \
+ "@@ZA")
+#elif defined(_M_IA_64) || defined(_M_AMD64) || defined(_M_ARM) || \
+ defined(_M_ARM64)
+#pragma comment( \
+ linker, \
+ "/alternatename:?zone_info_source_factory@cctz_extension@time_internal@" ABSL_INTERNAL_MANGLED_NS \
+ "@@3P6A?AV?$unique_ptr@VZoneInfoSource@cctz@time_internal@" ABSL_INTERNAL_MANGLED_NS \
+ "@@U?$default_delete@VZoneInfoSource@cctz@time_internal@" ABSL_INTERNAL_MANGLED_NS \
+ "@@@std@@@std@@AEBV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@" ABSL_INTERNAL_MANGLED_BACKREFERENCE \
+ "@AEBV?$function@$$A6A?AV?$unique_ptr@VZoneInfoSource@cctz@time_internal@" ABSL_INTERNAL_MANGLED_NS \
+ "@@U?$default_delete@VZoneInfoSource@cctz@time_internal@" ABSL_INTERNAL_MANGLED_NS \
+ "@@@std@@@std@@AEBV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@2@@Z@" ABSL_INTERNAL_MANGLED_BACKREFERENCE \
+ "@@ZEA=?default_factory@cctz_extension@time_internal@" ABSL_INTERNAL_MANGLED_NS \
+ "@@3P6A?AV?$unique_ptr@VZoneInfoSource@cctz@time_internal@" ABSL_INTERNAL_MANGLED_NS \
+ "@@U?$default_delete@VZoneInfoSource@cctz@time_internal@" ABSL_INTERNAL_MANGLED_NS \
+ "@@@std@@@std@@AEBV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@" ABSL_INTERNAL_MANGLED_BACKREFERENCE \
+ "@AEBV?$function@$$A6A?AV?$unique_ptr@VZoneInfoSource@cctz@time_internal@" ABSL_INTERNAL_MANGLED_NS \
+ "@@U?$default_delete@VZoneInfoSource@cctz@time_internal@" ABSL_INTERNAL_MANGLED_NS \
+ "@@@std@@@std@@AEBV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@2@@Z@" ABSL_INTERNAL_MANGLED_BACKREFERENCE \
+ "@@ZEA")
+#else
+#error Unsupported MSVC platform
+#endif // _M_<PLATFORM>
+#else
+// Make it a "strong" definition if we have no other choice.
+ZoneInfoSourceFactory zone_info_source_factory = DefaultFactory;
+#endif
+
+} // namespace cctz_extension
+} // namespace time_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/time/internal/cctz/testdata/README.zoneinfo b/third_party/abseil/src/absl/time/internal/cctz/testdata/README.zoneinfo
new file mode 100644
index 0000000..95fb4a9
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/testdata/README.zoneinfo
@@ -0,0 +1,37 @@
+testdata/zoneinfo contains time-zone data files that may be used with CCTZ.
+Install them in a location referenced by the ${TZDIR} environment variable.
+Symbolic and hard links have been eliminated for portability.
+
+On Linux systems the distribution's versions of these files can probably
+already be found in the default ${TZDIR} location, /usr/share/zoneinfo.
+
+New versions can be generated using the following shell script.
+
+ #!/bin/sh -
+ set -e
+ DESTDIR=$(mktemp -d)
+ trap "rm -fr ${DESTDIR}" 0 2 15
+ (
+ cd ${DESTDIR}
+ git clone https://github.com/eggert/tz.git
+ make --directory=tz \
+ install DESTDIR=${DESTDIR} \
+ DATAFORM=vanguard \
+ TZDIR=/zoneinfo \
+ REDO=posix_only \
+ LOCALTIME=Factory \
+ TZDATA_TEXT= \
+ ZONETABLES=zone1970.tab
+ tar --create --dereference --hard-dereference --file tzfile.tar \
+ --directory=tz tzfile.h
+ tar --create --dereference --hard-dereference --file zoneinfo.tar \
+ --exclude=zoneinfo/posixrules zoneinfo \
+ --directory=tz version
+ )
+ tar --extract --directory src --file ${DESTDIR}/tzfile.tar
+ tar --extract --directory testdata --file ${DESTDIR}/zoneinfo.tar
+ exit 0
+
+To run the CCTZ tests using the testdata/zoneinfo files, execute:
+
+ bazel test --test_env=TZDIR=${PWD}/testdata/zoneinfo ...
diff --git a/third_party/abseil/src/absl/time/internal/cctz/testdata/version b/third_party/abseil/src/absl/time/internal/cctz/testdata/version
new file mode 100644
index 0000000..b4410dc
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/testdata/version
@@ -0,0 +1 @@
+2020d
diff --git a/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Africa/Abidjan b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Africa/Abidjan
new file mode 100644
index 0000000..8906e88
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Africa/Abidjan
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diff --git a/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Africa/Accra b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Africa/Accra
new file mode 100644
index 0000000..9ca907b
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Africa/Accra
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diff --git a/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Africa/Addis_Ababa b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Africa/Addis_Ababa
new file mode 100644
index 0000000..d3c0bb3
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Africa/Addis_Ababa
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diff --git a/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Africa/Algiers b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Africa/Algiers
new file mode 100644
index 0000000..56a4dd2
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Africa/Algiers
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diff --git a/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Africa/Asmara b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Africa/Asmara
new file mode 100644
index 0000000..d3c0bb3
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Africa/Asmara
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diff --git a/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Africa/Asmera b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Africa/Asmera
new file mode 100644
index 0000000..d3c0bb3
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Africa/Asmera
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diff --git a/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Africa/Bamako b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Africa/Bamako
new file mode 100644
index 0000000..8906e88
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Africa/Bamako
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diff --git a/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Africa/Bangui b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Africa/Bangui
new file mode 100644
index 0000000..2f2ce2f
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Africa/Bangui
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diff --git a/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Africa/Banjul b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Africa/Banjul
new file mode 100644
index 0000000..8906e88
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Africa/Banjul
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diff --git a/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Africa/Bissau b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Africa/Bissau
new file mode 100644
index 0000000..0da1d1e
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Africa/Bissau
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diff --git a/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Africa/Blantyre b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Africa/Blantyre
new file mode 100644
index 0000000..651e5cf
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Africa/Blantyre
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diff --git a/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Africa/Brazzaville b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Africa/Brazzaville
new file mode 100644
index 0000000..2f2ce2f
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Africa/Brazzaville
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diff --git a/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Africa/Bujumbura b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Africa/Bujumbura
new file mode 100644
index 0000000..651e5cf
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Africa/Bujumbura
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diff --git a/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Africa/Cairo b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Africa/Cairo
new file mode 100644
index 0000000..ea38c97
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Africa/Cairo
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diff --git a/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Africa/Casablanca b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Africa/Casablanca
new file mode 100644
index 0000000..0263c90
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Africa/Casablanca
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diff --git a/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Africa/Ceuta b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Africa/Ceuta
new file mode 100644
index 0000000..a461dce
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Africa/Ceuta
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diff --git a/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Africa/Conakry b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Africa/Conakry
new file mode 100644
index 0000000..8906e88
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Africa/Conakry
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new file mode 100644
index 0000000..8906e88
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Africa/Dakar
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new file mode 100644
index 0000000..d3c0bb3
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Africa/Dar_es_Salaam
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new file mode 100644
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--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Africa/Djibouti
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new file mode 100644
index 0000000..2f2ce2f
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Africa/Douala
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new file mode 100644
index 0000000..772e23c
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Africa/El_Aaiun
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new file mode 100644
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--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Africa/Freetown
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new file mode 100644
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+++ b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Africa/Gaborone
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new file mode 100644
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+++ b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Africa/Harare
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new file mode 100644
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+++ b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Africa/Kampala
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diff --git a/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Tongatapu b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Tongatapu
new file mode 100644
index 0000000..54aeb0f
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Tongatapu
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diff --git a/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Truk b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Truk
new file mode 100644
index 0000000..ea3fb5c
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Truk
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diff --git a/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Wake b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Wake
new file mode 100644
index 0000000..71cca88
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Wake
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diff --git a/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Wallis b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Wallis
new file mode 100644
index 0000000..4bce893
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Wallis
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diff --git a/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Yap b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Yap
new file mode 100644
index 0000000..ea3fb5c
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Pacific/Yap
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diff --git a/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Poland b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Poland
new file mode 100644
index 0000000..efe1a40
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Poland
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diff --git a/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Portugal b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Portugal
new file mode 100644
index 0000000..6484166
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Portugal
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diff --git a/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/ROC b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/ROC
new file mode 100644
index 0000000..35d89d0
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/ROC
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diff --git a/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/ROK b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/ROK
new file mode 100644
index 0000000..1755147
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/ROK
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diff --git a/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Singapore b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Singapore
new file mode 100644
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--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Singapore
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+++ b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Turkey
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diff --git a/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/UCT b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/UCT
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index 0000000..00841a6
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/UCT
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--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/US/Alaska
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index 0000000..b1497bd
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/US/Aleutian
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diff --git a/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/US/Arizona b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/US/Arizona
new file mode 100644
index 0000000..c2bd2f9
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/US/Arizona
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diff --git a/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/US/Central b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/US/Central
new file mode 100644
index 0000000..b016880
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/US/Central
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diff --git a/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/US/East-Indiana b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/US/East-Indiana
new file mode 100644
index 0000000..6b08d15
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/US/East-Indiana
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diff --git a/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/US/Eastern b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/US/Eastern
new file mode 100644
index 0000000..2b6c2ee
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new file mode 100644
index 0000000..40e3d49
--- /dev/null
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new file mode 100644
index 0000000..b187d5f
--- /dev/null
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diff --git a/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/US/Michigan b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/US/Michigan
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diff --git a/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/US/Mountain b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/US/Mountain
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diff --git a/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/W-SU b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/W-SU
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diff --git a/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/WET b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/WET
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index 0000000..423c6c2
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/WET
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diff --git a/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Zulu b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/Zulu
new file mode 100644
index 0000000..00841a6
--- /dev/null
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diff --git a/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/iso3166.tab b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/iso3166.tab
new file mode 100644
index 0000000..a4ff61a
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/iso3166.tab
@@ -0,0 +1,274 @@
+# ISO 3166 alpha-2 country codes
+#
+# This file is in the public domain, so clarified as of
+# 2009-05-17 by Arthur David Olson.
+#
+# From Paul Eggert (2015-05-02):
+# This file contains a table of two-letter country codes. Columns are
+# separated by a single tab. Lines beginning with '#' are comments.
+# All text uses UTF-8 encoding. The columns of the table are as follows:
+#
+# 1. ISO 3166-1 alpha-2 country code, current as of
+# ISO 3166-1 N976 (2018-11-06). See: Updates on ISO 3166-1
+# https://isotc.iso.org/livelink/livelink/Open/16944257
+# 2. The usual English name for the coded region,
+# chosen so that alphabetic sorting of subsets produces helpful lists.
+# This is not the same as the English name in the ISO 3166 tables.
+#
+# The table is sorted by country code.
+#
+# This table is intended as an aid for users, to help them select time
+# zone data appropriate for their practical needs. It is not intended
+# to take or endorse any position on legal or territorial claims.
+#
+#country-
+#code name of country, territory, area, or subdivision
+AD Andorra
+AE United Arab Emirates
+AF Afghanistan
+AG Antigua & Barbuda
+AI Anguilla
+AL Albania
+AM Armenia
+AO Angola
+AQ Antarctica
+AR Argentina
+AS Samoa (American)
+AT Austria
+AU Australia
+AW Aruba
+AX Åland Islands
+AZ Azerbaijan
+BA Bosnia & Herzegovina
+BB Barbados
+BD Bangladesh
+BE Belgium
+BF Burkina Faso
+BG Bulgaria
+BH Bahrain
+BI Burundi
+BJ Benin
+BL St Barthelemy
+BM Bermuda
+BN Brunei
+BO Bolivia
+BQ Caribbean NL
+BR Brazil
+BS Bahamas
+BT Bhutan
+BV Bouvet Island
+BW Botswana
+BY Belarus
+BZ Belize
+CA Canada
+CC Cocos (Keeling) Islands
+CD Congo (Dem. Rep.)
+CF Central African Rep.
+CG Congo (Rep.)
+CH Switzerland
+CI Côte d'Ivoire
+CK Cook Islands
+CL Chile
+CM Cameroon
+CN China
+CO Colombia
+CR Costa Rica
+CU Cuba
+CV Cape Verde
+CW Curaçao
+CX Christmas Island
+CY Cyprus
+CZ Czech Republic
+DE Germany
+DJ Djibouti
+DK Denmark
+DM Dominica
+DO Dominican Republic
+DZ Algeria
+EC Ecuador
+EE Estonia
+EG Egypt
+EH Western Sahara
+ER Eritrea
+ES Spain
+ET Ethiopia
+FI Finland
+FJ Fiji
+FK Falkland Islands
+FM Micronesia
+FO Faroe Islands
+FR France
+GA Gabon
+GB Britain (UK)
+GD Grenada
+GE Georgia
+GF French Guiana
+GG Guernsey
+GH Ghana
+GI Gibraltar
+GL Greenland
+GM Gambia
+GN Guinea
+GP Guadeloupe
+GQ Equatorial Guinea
+GR Greece
+GS South Georgia & the South Sandwich Islands
+GT Guatemala
+GU Guam
+GW Guinea-Bissau
+GY Guyana
+HK Hong Kong
+HM Heard Island & McDonald Islands
+HN Honduras
+HR Croatia
+HT Haiti
+HU Hungary
+ID Indonesia
+IE Ireland
+IL Israel
+IM Isle of Man
+IN India
+IO British Indian Ocean Territory
+IQ Iraq
+IR Iran
+IS Iceland
+IT Italy
+JE Jersey
+JM Jamaica
+JO Jordan
+JP Japan
+KE Kenya
+KG Kyrgyzstan
+KH Cambodia
+KI Kiribati
+KM Comoros
+KN St Kitts & Nevis
+KP Korea (North)
+KR Korea (South)
+KW Kuwait
+KY Cayman Islands
+KZ Kazakhstan
+LA Laos
+LB Lebanon
+LC St Lucia
+LI Liechtenstein
+LK Sri Lanka
+LR Liberia
+LS Lesotho
+LT Lithuania
+LU Luxembourg
+LV Latvia
+LY Libya
+MA Morocco
+MC Monaco
+MD Moldova
+ME Montenegro
+MF St Martin (French)
+MG Madagascar
+MH Marshall Islands
+MK North Macedonia
+ML Mali
+MM Myanmar (Burma)
+MN Mongolia
+MO Macau
+MP Northern Mariana Islands
+MQ Martinique
+MR Mauritania
+MS Montserrat
+MT Malta
+MU Mauritius
+MV Maldives
+MW Malawi
+MX Mexico
+MY Malaysia
+MZ Mozambique
+NA Namibia
+NC New Caledonia
+NE Niger
+NF Norfolk Island
+NG Nigeria
+NI Nicaragua
+NL Netherlands
+NO Norway
+NP Nepal
+NR Nauru
+NU Niue
+NZ New Zealand
+OM Oman
+PA Panama
+PE Peru
+PF French Polynesia
+PG Papua New Guinea
+PH Philippines
+PK Pakistan
+PL Poland
+PM St Pierre & Miquelon
+PN Pitcairn
+PR Puerto Rico
+PS Palestine
+PT Portugal
+PW Palau
+PY Paraguay
+QA Qatar
+RE Réunion
+RO Romania
+RS Serbia
+RU Russia
+RW Rwanda
+SA Saudi Arabia
+SB Solomon Islands
+SC Seychelles
+SD Sudan
+SE Sweden
+SG Singapore
+SH St Helena
+SI Slovenia
+SJ Svalbard & Jan Mayen
+SK Slovakia
+SL Sierra Leone
+SM San Marino
+SN Senegal
+SO Somalia
+SR Suriname
+SS South Sudan
+ST Sao Tome & Principe
+SV El Salvador
+SX St Maarten (Dutch)
+SY Syria
+SZ Eswatini (Swaziland)
+TC Turks & Caicos Is
+TD Chad
+TF French Southern & Antarctic Lands
+TG Togo
+TH Thailand
+TJ Tajikistan
+TK Tokelau
+TL East Timor
+TM Turkmenistan
+TN Tunisia
+TO Tonga
+TR Turkey
+TT Trinidad & Tobago
+TV Tuvalu
+TW Taiwan
+TZ Tanzania
+UA Ukraine
+UG Uganda
+UM US minor outlying islands
+US United States
+UY Uruguay
+UZ Uzbekistan
+VA Vatican City
+VC St Vincent
+VE Venezuela
+VG Virgin Islands (UK)
+VI Virgin Islands (US)
+VN Vietnam
+VU Vanuatu
+WF Wallis & Futuna
+WS Samoa (western)
+YE Yemen
+YT Mayotte
+ZA South Africa
+ZM Zambia
+ZW Zimbabwe
diff --git a/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/localtime b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/localtime
new file mode 100644
index 0000000..afeeb88
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/localtime
Binary files differ
diff --git a/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/zone1970.tab b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/zone1970.tab
new file mode 100644
index 0000000..53ee77e
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/cctz/testdata/zoneinfo/zone1970.tab
@@ -0,0 +1,384 @@
+# tzdb timezone descriptions
+#
+# This file is in the public domain.
+#
+# From Paul Eggert (2018-06-27):
+# This file contains a table where each row stands for a timezone where
+# civil timestamps have agreed since 1970. Columns are separated by
+# a single tab. Lines beginning with '#' are comments. All text uses
+# UTF-8 encoding. The columns of the table are as follows:
+#
+# 1. The countries that overlap the timezone, as a comma-separated list
+# of ISO 3166 2-character country codes. See the file 'iso3166.tab'.
+# 2. Latitude and longitude of the timezone's principal location
+# in ISO 6709 sign-degrees-minutes-seconds format,
+# either ±DDMM±DDDMM or ±DDMMSS±DDDMMSS,
+# first latitude (+ is north), then longitude (+ is east).
+# 3. Timezone name used in value of TZ environment variable.
+# Please see the theory.html file for how these names are chosen.
+# If multiple timezones overlap a country, each has a row in the
+# table, with each column 1 containing the country code.
+# 4. Comments; present if and only if a country has multiple timezones.
+#
+# If a timezone covers multiple countries, the most-populous city is used,
+# and that country is listed first in column 1; any other countries
+# are listed alphabetically by country code. The table is sorted
+# first by country code, then (if possible) by an order within the
+# country that (1) makes some geographical sense, and (2) puts the
+# most populous timezones first, where that does not contradict (1).
+#
+# This table is intended as an aid for users, to help them select timezones
+# appropriate for their practical needs. It is not intended to take or
+# endorse any position on legal or territorial claims.
+#
+#country-
+#codes coordinates TZ comments
+AD +4230+00131 Europe/Andorra
+AE,OM +2518+05518 Asia/Dubai
+AF +3431+06912 Asia/Kabul
+AL +4120+01950 Europe/Tirane
+AM +4011+04430 Asia/Yerevan
+AQ -6617+11031 Antarctica/Casey Casey
+AQ -6835+07758 Antarctica/Davis Davis
+AQ -6640+14001 Antarctica/DumontDUrville Dumont-d'Urville
+AQ -6736+06253 Antarctica/Mawson Mawson
+AQ -6448-06406 Antarctica/Palmer Palmer
+AQ -6734-06808 Antarctica/Rothera Rothera
+AQ -690022+0393524 Antarctica/Syowa Syowa
+AQ -720041+0023206 Antarctica/Troll Troll
+AQ -7824+10654 Antarctica/Vostok Vostok
+AR -3436-05827 America/Argentina/Buenos_Aires Buenos Aires (BA, CF)
+AR -3124-06411 America/Argentina/Cordoba Argentina (most areas: CB, CC, CN, ER, FM, MN, SE, SF)
+AR -2447-06525 America/Argentina/Salta Salta (SA, LP, NQ, RN)
+AR -2411-06518 America/Argentina/Jujuy Jujuy (JY)
+AR -2649-06513 America/Argentina/Tucuman Tucumán (TM)
+AR -2828-06547 America/Argentina/Catamarca Catamarca (CT); Chubut (CH)
+AR -2926-06651 America/Argentina/La_Rioja La Rioja (LR)
+AR -3132-06831 America/Argentina/San_Juan San Juan (SJ)
+AR -3253-06849 America/Argentina/Mendoza Mendoza (MZ)
+AR -3319-06621 America/Argentina/San_Luis San Luis (SL)
+AR -5138-06913 America/Argentina/Rio_Gallegos Santa Cruz (SC)
+AR -5448-06818 America/Argentina/Ushuaia Tierra del Fuego (TF)
+AS,UM -1416-17042 Pacific/Pago_Pago Samoa, Midway
+AT +4813+01620 Europe/Vienna
+AU -3133+15905 Australia/Lord_Howe Lord Howe Island
+AU -5430+15857 Antarctica/Macquarie Macquarie Island
+AU -4253+14719 Australia/Hobart Tasmania (most areas)
+AU -3956+14352 Australia/Currie Tasmania (King Island)
+AU -3749+14458 Australia/Melbourne Victoria
+AU -3352+15113 Australia/Sydney New South Wales (most areas)
+AU -3157+14127 Australia/Broken_Hill New South Wales (Yancowinna)
+AU -2728+15302 Australia/Brisbane Queensland (most areas)
+AU -2016+14900 Australia/Lindeman Queensland (Whitsunday Islands)
+AU -3455+13835 Australia/Adelaide South Australia
+AU -1228+13050 Australia/Darwin Northern Territory
+AU -3157+11551 Australia/Perth Western Australia (most areas)
+AU -3143+12852 Australia/Eucla Western Australia (Eucla)
+AZ +4023+04951 Asia/Baku
+BB +1306-05937 America/Barbados
+BD +2343+09025 Asia/Dhaka
+BE +5050+00420 Europe/Brussels
+BG +4241+02319 Europe/Sofia
+BM +3217-06446 Atlantic/Bermuda
+BN +0456+11455 Asia/Brunei
+BO -1630-06809 America/La_Paz
+BR -0351-03225 America/Noronha Atlantic islands
+BR -0127-04829 America/Belem Pará (east); Amapá
+BR -0343-03830 America/Fortaleza Brazil (northeast: MA, PI, CE, RN, PB)
+BR -0803-03454 America/Recife Pernambuco
+BR -0712-04812 America/Araguaina Tocantins
+BR -0940-03543 America/Maceio Alagoas, Sergipe
+BR -1259-03831 America/Bahia Bahia
+BR -2332-04637 America/Sao_Paulo Brazil (southeast: GO, DF, MG, ES, RJ, SP, PR, SC, RS)
+BR -2027-05437 America/Campo_Grande Mato Grosso do Sul
+BR -1535-05605 America/Cuiaba Mato Grosso
+BR -0226-05452 America/Santarem Pará (west)
+BR -0846-06354 America/Porto_Velho Rondônia
+BR +0249-06040 America/Boa_Vista Roraima
+BR -0308-06001 America/Manaus Amazonas (east)
+BR -0640-06952 America/Eirunepe Amazonas (west)
+BR -0958-06748 America/Rio_Branco Acre
+BS +2505-07721 America/Nassau
+BT +2728+08939 Asia/Thimphu
+BY +5354+02734 Europe/Minsk
+BZ +1730-08812 America/Belize
+CA +4734-05243 America/St_Johns Newfoundland; Labrador (southeast)
+CA +4439-06336 America/Halifax Atlantic - NS (most areas); PE
+CA +4612-05957 America/Glace_Bay Atlantic - NS (Cape Breton)
+CA +4606-06447 America/Moncton Atlantic - New Brunswick
+CA +5320-06025 America/Goose_Bay Atlantic - Labrador (most areas)
+CA +5125-05707 America/Blanc-Sablon AST - QC (Lower North Shore)
+CA +4339-07923 America/Toronto Eastern - ON, QC (most areas)
+CA +4901-08816 America/Nipigon Eastern - ON, QC (no DST 1967-73)
+CA +4823-08915 America/Thunder_Bay Eastern - ON (Thunder Bay)
+CA +6344-06828 America/Iqaluit Eastern - NU (most east areas)
+CA +6608-06544 America/Pangnirtung Eastern - NU (Pangnirtung)
+CA +484531-0913718 America/Atikokan EST - ON (Atikokan); NU (Coral H)
+CA +4953-09709 America/Winnipeg Central - ON (west); Manitoba
+CA +4843-09434 America/Rainy_River Central - ON (Rainy R, Ft Frances)
+CA +744144-0944945 America/Resolute Central - NU (Resolute)
+CA +624900-0920459 America/Rankin_Inlet Central - NU (central)
+CA +5024-10439 America/Regina CST - SK (most areas)
+CA +5017-10750 America/Swift_Current CST - SK (midwest)
+CA +5333-11328 America/Edmonton Mountain - AB; BC (E); SK (W)
+CA +690650-1050310 America/Cambridge_Bay Mountain - NU (west)
+CA +6227-11421 America/Yellowknife Mountain - NT (central)
+CA +682059-1334300 America/Inuvik Mountain - NT (west)
+CA +4906-11631 America/Creston MST - BC (Creston)
+CA +5946-12014 America/Dawson_Creek MST - BC (Dawson Cr, Ft St John)
+CA +5848-12242 America/Fort_Nelson MST - BC (Ft Nelson)
+CA +4916-12307 America/Vancouver Pacific - BC (most areas)
+CA +6043-13503 America/Whitehorse Pacific - Yukon (east)
+CA +6404-13925 America/Dawson Pacific - Yukon (west)
+CC -1210+09655 Indian/Cocos
+CH,DE,LI +4723+00832 Europe/Zurich Swiss time
+CI,BF,GM,GN,ML,MR,SH,SL,SN,TG +0519-00402 Africa/Abidjan
+CK -2114-15946 Pacific/Rarotonga
+CL -3327-07040 America/Santiago Chile (most areas)
+CL -5309-07055 America/Punta_Arenas Region of Magallanes
+CL -2709-10926 Pacific/Easter Easter Island
+CN +3114+12128 Asia/Shanghai Beijing Time
+CN +4348+08735 Asia/Urumqi Xinjiang Time
+CO +0436-07405 America/Bogota
+CR +0956-08405 America/Costa_Rica
+CU +2308-08222 America/Havana
+CV +1455-02331 Atlantic/Cape_Verde
+CW,AW,BQ,SX +1211-06900 America/Curacao
+CX -1025+10543 Indian/Christmas
+CY +3510+03322 Asia/Nicosia Cyprus (most areas)
+CY +3507+03357 Asia/Famagusta Northern Cyprus
+CZ,SK +5005+01426 Europe/Prague
+DE +5230+01322 Europe/Berlin Germany (most areas)
+DK +5540+01235 Europe/Copenhagen
+DO +1828-06954 America/Santo_Domingo
+DZ +3647+00303 Africa/Algiers
+EC -0210-07950 America/Guayaquil Ecuador (mainland)
+EC -0054-08936 Pacific/Galapagos Galápagos Islands
+EE +5925+02445 Europe/Tallinn
+EG +3003+03115 Africa/Cairo
+EH +2709-01312 Africa/El_Aaiun
+ES +4024-00341 Europe/Madrid Spain (mainland)
+ES +3553-00519 Africa/Ceuta Ceuta, Melilla
+ES +2806-01524 Atlantic/Canary Canary Islands
+FI,AX +6010+02458 Europe/Helsinki
+FJ -1808+17825 Pacific/Fiji
+FK -5142-05751 Atlantic/Stanley
+FM +0725+15147 Pacific/Chuuk Chuuk/Truk, Yap
+FM +0658+15813 Pacific/Pohnpei Pohnpei/Ponape
+FM +0519+16259 Pacific/Kosrae Kosrae
+FO +6201-00646 Atlantic/Faroe
+FR +4852+00220 Europe/Paris
+GB,GG,IM,JE +513030-0000731 Europe/London
+GE +4143+04449 Asia/Tbilisi
+GF +0456-05220 America/Cayenne
+GH +0533-00013 Africa/Accra
+GI +3608-00521 Europe/Gibraltar
+GL +6411-05144 America/Nuuk Greenland (most areas)
+GL +7646-01840 America/Danmarkshavn National Park (east coast)
+GL +7029-02158 America/Scoresbysund Scoresbysund/Ittoqqortoormiit
+GL +7634-06847 America/Thule Thule/Pituffik
+GR +3758+02343 Europe/Athens
+GS -5416-03632 Atlantic/South_Georgia
+GT +1438-09031 America/Guatemala
+GU,MP +1328+14445 Pacific/Guam
+GW +1151-01535 Africa/Bissau
+GY +0648-05810 America/Guyana
+HK +2217+11409 Asia/Hong_Kong
+HN +1406-08713 America/Tegucigalpa
+HT +1832-07220 America/Port-au-Prince
+HU +4730+01905 Europe/Budapest
+ID -0610+10648 Asia/Jakarta Java, Sumatra
+ID -0002+10920 Asia/Pontianak Borneo (west, central)
+ID -0507+11924 Asia/Makassar Borneo (east, south); Sulawesi/Celebes, Bali, Nusa Tengarra; Timor (west)
+ID -0232+14042 Asia/Jayapura New Guinea (West Papua / Irian Jaya); Malukus/Moluccas
+IE +5320-00615 Europe/Dublin
+IL +314650+0351326 Asia/Jerusalem
+IN +2232+08822 Asia/Kolkata
+IO -0720+07225 Indian/Chagos
+IQ +3321+04425 Asia/Baghdad
+IR +3540+05126 Asia/Tehran
+IS +6409-02151 Atlantic/Reykjavik
+IT,SM,VA +4154+01229 Europe/Rome
+JM +175805-0764736 America/Jamaica
+JO +3157+03556 Asia/Amman
+JP +353916+1394441 Asia/Tokyo
+KE,DJ,ER,ET,KM,MG,SO,TZ,UG,YT -0117+03649 Africa/Nairobi
+KG +4254+07436 Asia/Bishkek
+KI +0125+17300 Pacific/Tarawa Gilbert Islands
+KI -0308-17105 Pacific/Enderbury Phoenix Islands
+KI +0152-15720 Pacific/Kiritimati Line Islands
+KP +3901+12545 Asia/Pyongyang
+KR +3733+12658 Asia/Seoul
+KZ +4315+07657 Asia/Almaty Kazakhstan (most areas)
+KZ +4448+06528 Asia/Qyzylorda Qyzylorda/Kyzylorda/Kzyl-Orda
+KZ +5312+06337 Asia/Qostanay Qostanay/Kostanay/Kustanay
+KZ +5017+05710 Asia/Aqtobe Aqtöbe/Aktobe
+KZ +4431+05016 Asia/Aqtau Mangghystaū/Mankistau
+KZ +4707+05156 Asia/Atyrau Atyraū/Atirau/Gur'yev
+KZ +5113+05121 Asia/Oral West Kazakhstan
+LB +3353+03530 Asia/Beirut
+LK +0656+07951 Asia/Colombo
+LR +0618-01047 Africa/Monrovia
+LT +5441+02519 Europe/Vilnius
+LU +4936+00609 Europe/Luxembourg
+LV +5657+02406 Europe/Riga
+LY +3254+01311 Africa/Tripoli
+MA +3339-00735 Africa/Casablanca
+MC +4342+00723 Europe/Monaco
+MD +4700+02850 Europe/Chisinau
+MH +0709+17112 Pacific/Majuro Marshall Islands (most areas)
+MH +0905+16720 Pacific/Kwajalein Kwajalein
+MM +1647+09610 Asia/Yangon
+MN +4755+10653 Asia/Ulaanbaatar Mongolia (most areas)
+MN +4801+09139 Asia/Hovd Bayan-Ölgii, Govi-Altai, Hovd, Uvs, Zavkhan
+MN +4804+11430 Asia/Choibalsan Dornod, Sükhbaatar
+MO +221150+1133230 Asia/Macau
+MQ +1436-06105 America/Martinique
+MT +3554+01431 Europe/Malta
+MU -2010+05730 Indian/Mauritius
+MV +0410+07330 Indian/Maldives
+MX +1924-09909 America/Mexico_City Central Time
+MX +2105-08646 America/Cancun Eastern Standard Time - Quintana Roo
+MX +2058-08937 America/Merida Central Time - Campeche, Yucatán
+MX +2540-10019 America/Monterrey Central Time - Durango; Coahuila, Nuevo León, Tamaulipas (most areas)
+MX +2550-09730 America/Matamoros Central Time US - Coahuila, Nuevo León, Tamaulipas (US border)
+MX +2313-10625 America/Mazatlan Mountain Time - Baja California Sur, Nayarit, Sinaloa
+MX +2838-10605 America/Chihuahua Mountain Time - Chihuahua (most areas)
+MX +2934-10425 America/Ojinaga Mountain Time US - Chihuahua (US border)
+MX +2904-11058 America/Hermosillo Mountain Standard Time - Sonora
+MX +3232-11701 America/Tijuana Pacific Time US - Baja California
+MX +2048-10515 America/Bahia_Banderas Central Time - Bahía de Banderas
+MY +0310+10142 Asia/Kuala_Lumpur Malaysia (peninsula)
+MY +0133+11020 Asia/Kuching Sabah, Sarawak
+MZ,BI,BW,CD,MW,RW,ZM,ZW -2558+03235 Africa/Maputo Central Africa Time
+NA -2234+01706 Africa/Windhoek
+NC -2216+16627 Pacific/Noumea
+NF -2903+16758 Pacific/Norfolk
+NG,AO,BJ,CD,CF,CG,CM,GA,GQ,NE +0627+00324 Africa/Lagos West Africa Time
+NI +1209-08617 America/Managua
+NL +5222+00454 Europe/Amsterdam
+NO,SJ +5955+01045 Europe/Oslo
+NP +2743+08519 Asia/Kathmandu
+NR -0031+16655 Pacific/Nauru
+NU -1901-16955 Pacific/Niue
+NZ,AQ -3652+17446 Pacific/Auckland New Zealand time
+NZ -4357-17633 Pacific/Chatham Chatham Islands
+PA,KY +0858-07932 America/Panama
+PE -1203-07703 America/Lima
+PF -1732-14934 Pacific/Tahiti Society Islands
+PF -0900-13930 Pacific/Marquesas Marquesas Islands
+PF -2308-13457 Pacific/Gambier Gambier Islands
+PG -0930+14710 Pacific/Port_Moresby Papua New Guinea (most areas)
+PG -0613+15534 Pacific/Bougainville Bougainville
+PH +1435+12100 Asia/Manila
+PK +2452+06703 Asia/Karachi
+PL +5215+02100 Europe/Warsaw
+PM +4703-05620 America/Miquelon
+PN -2504-13005 Pacific/Pitcairn
+PR +182806-0660622 America/Puerto_Rico
+PS +3130+03428 Asia/Gaza Gaza Strip
+PS +313200+0350542 Asia/Hebron West Bank
+PT +3843-00908 Europe/Lisbon Portugal (mainland)
+PT +3238-01654 Atlantic/Madeira Madeira Islands
+PT +3744-02540 Atlantic/Azores Azores
+PW +0720+13429 Pacific/Palau
+PY -2516-05740 America/Asuncion
+QA,BH +2517+05132 Asia/Qatar
+RE,TF -2052+05528 Indian/Reunion Réunion, Crozet, Scattered Islands
+RO +4426+02606 Europe/Bucharest
+RS,BA,HR,ME,MK,SI +4450+02030 Europe/Belgrade
+RU +5443+02030 Europe/Kaliningrad MSK-01 - Kaliningrad
+RU +554521+0373704 Europe/Moscow MSK+00 - Moscow area
+# Mention RU and UA alphabetically. See "territorial claims" above.
+RU,UA +4457+03406 Europe/Simferopol Crimea
+RU +5836+04939 Europe/Kirov MSK+00 - Kirov
+RU +4621+04803 Europe/Astrakhan MSK+01 - Astrakhan
+RU +4844+04425 Europe/Volgograd MSK+01 - Volgograd
+RU +5134+04602 Europe/Saratov MSK+01 - Saratov
+RU +5420+04824 Europe/Ulyanovsk MSK+01 - Ulyanovsk
+RU +5312+05009 Europe/Samara MSK+01 - Samara, Udmurtia
+RU +5651+06036 Asia/Yekaterinburg MSK+02 - Urals
+RU +5500+07324 Asia/Omsk MSK+03 - Omsk
+RU +5502+08255 Asia/Novosibirsk MSK+04 - Novosibirsk
+RU +5322+08345 Asia/Barnaul MSK+04 - Altai
+RU +5630+08458 Asia/Tomsk MSK+04 - Tomsk
+RU +5345+08707 Asia/Novokuznetsk MSK+04 - Kemerovo
+RU +5601+09250 Asia/Krasnoyarsk MSK+04 - Krasnoyarsk area
+RU +5216+10420 Asia/Irkutsk MSK+05 - Irkutsk, Buryatia
+RU +5203+11328 Asia/Chita MSK+06 - Zabaykalsky
+RU +6200+12940 Asia/Yakutsk MSK+06 - Lena River
+RU +623923+1353314 Asia/Khandyga MSK+06 - Tomponsky, Ust-Maysky
+RU +4310+13156 Asia/Vladivostok MSK+07 - Amur River
+RU +643337+1431336 Asia/Ust-Nera MSK+07 - Oymyakonsky
+RU +5934+15048 Asia/Magadan MSK+08 - Magadan
+RU +4658+14242 Asia/Sakhalin MSK+08 - Sakhalin Island
+RU +6728+15343 Asia/Srednekolymsk MSK+08 - Sakha (E); North Kuril Is
+RU +5301+15839 Asia/Kamchatka MSK+09 - Kamchatka
+RU +6445+17729 Asia/Anadyr MSK+09 - Bering Sea
+SA,KW,YE +2438+04643 Asia/Riyadh
+SB -0932+16012 Pacific/Guadalcanal
+SC -0440+05528 Indian/Mahe
+SD +1536+03232 Africa/Khartoum
+SE +5920+01803 Europe/Stockholm
+SG +0117+10351 Asia/Singapore
+SR +0550-05510 America/Paramaribo
+SS +0451+03137 Africa/Juba
+ST +0020+00644 Africa/Sao_Tome
+SV +1342-08912 America/El_Salvador
+SY +3330+03618 Asia/Damascus
+TC +2128-07108 America/Grand_Turk
+TD +1207+01503 Africa/Ndjamena
+TF -492110+0701303 Indian/Kerguelen Kerguelen, St Paul Island, Amsterdam Island
+TH,KH,LA,VN +1345+10031 Asia/Bangkok Indochina (most areas)
+TJ +3835+06848 Asia/Dushanbe
+TK -0922-17114 Pacific/Fakaofo
+TL -0833+12535 Asia/Dili
+TM +3757+05823 Asia/Ashgabat
+TN +3648+01011 Africa/Tunis
+TO -2110-17510 Pacific/Tongatapu
+TR +4101+02858 Europe/Istanbul
+TT,AG,AI,BL,DM,GD,GP,KN,LC,MF,MS,VC,VG,VI +1039-06131 America/Port_of_Spain
+TV -0831+17913 Pacific/Funafuti
+TW +2503+12130 Asia/Taipei
+UA +5026+03031 Europe/Kiev Ukraine (most areas)
+UA +4837+02218 Europe/Uzhgorod Transcarpathia
+UA +4750+03510 Europe/Zaporozhye Zaporozhye and east Lugansk
+UM +1917+16637 Pacific/Wake Wake Island
+US +404251-0740023 America/New_York Eastern (most areas)
+US +421953-0830245 America/Detroit Eastern - MI (most areas)
+US +381515-0854534 America/Kentucky/Louisville Eastern - KY (Louisville area)
+US +364947-0845057 America/Kentucky/Monticello Eastern - KY (Wayne)
+US +394606-0860929 America/Indiana/Indianapolis Eastern - IN (most areas)
+US +384038-0873143 America/Indiana/Vincennes Eastern - IN (Da, Du, K, Mn)
+US +410305-0863611 America/Indiana/Winamac Eastern - IN (Pulaski)
+US +382232-0862041 America/Indiana/Marengo Eastern - IN (Crawford)
+US +382931-0871643 America/Indiana/Petersburg Eastern - IN (Pike)
+US +384452-0850402 America/Indiana/Vevay Eastern - IN (Switzerland)
+US +415100-0873900 America/Chicago Central (most areas)
+US +375711-0864541 America/Indiana/Tell_City Central - IN (Perry)
+US +411745-0863730 America/Indiana/Knox Central - IN (Starke)
+US +450628-0873651 America/Menominee Central - MI (Wisconsin border)
+US +470659-1011757 America/North_Dakota/Center Central - ND (Oliver)
+US +465042-1012439 America/North_Dakota/New_Salem Central - ND (Morton rural)
+US +471551-1014640 America/North_Dakota/Beulah Central - ND (Mercer)
+US +394421-1045903 America/Denver Mountain (most areas)
+US +433649-1161209 America/Boise Mountain - ID (south); OR (east)
+US +332654-1120424 America/Phoenix MST - Arizona (except Navajo)
+US +340308-1181434 America/Los_Angeles Pacific
+US +611305-1495401 America/Anchorage Alaska (most areas)
+US +581807-1342511 America/Juneau Alaska - Juneau area
+US +571035-1351807 America/Sitka Alaska - Sitka area
+US +550737-1313435 America/Metlakatla Alaska - Annette Island
+US +593249-1394338 America/Yakutat Alaska - Yakutat
+US +643004-1652423 America/Nome Alaska (west)
+US +515248-1763929 America/Adak Aleutian Islands
+US,UM +211825-1575130 Pacific/Honolulu Hawaii
+UY -345433-0561245 America/Montevideo
+UZ +3940+06648 Asia/Samarkand Uzbekistan (west)
+UZ +4120+06918 Asia/Tashkent Uzbekistan (east)
+VE +1030-06656 America/Caracas
+VN +1045+10640 Asia/Ho_Chi_Minh Vietnam (south)
+VU -1740+16825 Pacific/Efate
+WF -1318-17610 Pacific/Wallis
+WS -1350-17144 Pacific/Apia
+ZA,LS,SZ -2615+02800 Africa/Johannesburg
diff --git a/third_party/abseil/src/absl/time/internal/get_current_time_chrono.inc b/third_party/abseil/src/absl/time/internal/get_current_time_chrono.inc
new file mode 100644
index 0000000..5eeb640
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/get_current_time_chrono.inc
@@ -0,0 +1,31 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <chrono>
+#include <cstdint>
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace time_internal {
+
+static int64_t GetCurrentTimeNanosFromSystem() {
+ return std::chrono::duration_cast<std::chrono::nanoseconds>(
+ std::chrono::system_clock::now() -
+ std::chrono::system_clock::from_time_t(0))
+ .count();
+}
+
+} // namespace time_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/time/internal/get_current_time_posix.inc b/third_party/abseil/src/absl/time/internal/get_current_time_posix.inc
new file mode 100644
index 0000000..4207200
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/get_current_time_posix.inc
@@ -0,0 +1,24 @@
+#include "absl/time/clock.h"
+
+#include <sys/time.h>
+#include <ctime>
+#include <cstdint>
+
+#include "absl/base/internal/raw_logging.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace time_internal {
+
+static int64_t GetCurrentTimeNanosFromSystem() {
+ const int64_t kNanosPerSecond = 1000 * 1000 * 1000;
+ struct timespec ts;
+ ABSL_RAW_CHECK(clock_gettime(CLOCK_REALTIME, &ts) == 0,
+ "Failed to read real-time clock.");
+ return (int64_t{ts.tv_sec} * kNanosPerSecond +
+ int64_t{ts.tv_nsec});
+}
+
+} // namespace time_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/time/internal/test_util.cc b/third_party/abseil/src/absl/time/internal/test_util.cc
new file mode 100644
index 0000000..9a485a0
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/test_util.cc
@@ -0,0 +1,131 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/time/internal/test_util.h"
+
+#include <algorithm>
+#include <cstddef>
+#include <cstring>
+
+#include "absl/base/config.h"
+#include "absl/base/internal/raw_logging.h"
+#include "absl/time/internal/cctz/include/cctz/zone_info_source.h"
+
+namespace cctz = absl::time_internal::cctz;
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace time_internal {
+
+TimeZone LoadTimeZone(const std::string& name) {
+ TimeZone tz;
+ ABSL_RAW_CHECK(LoadTimeZone(name, &tz), name.c_str());
+ return tz;
+}
+
+} // namespace time_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace time_internal {
+namespace cctz_extension {
+namespace {
+
+// Embed the zoneinfo data for time zones used during tests and benchmarks.
+// The data was generated using "xxd -i zoneinfo-file". There is no need
+// to update the data as long as the tests do not depend on recent changes
+// (and the past rules remain the same).
+#include "absl/time/internal/zoneinfo.inc"
+
+const struct ZoneInfo {
+ const char* name;
+ const char* data;
+ std::size_t length;
+} kZoneInfo[] = {
+ // The three real time zones used by :time_test and :time_benchmark.
+ {"America/Los_Angeles", //
+ reinterpret_cast<char*>(America_Los_Angeles), America_Los_Angeles_len},
+ {"America/New_York", //
+ reinterpret_cast<char*>(America_New_York), America_New_York_len},
+ {"Australia/Sydney", //
+ reinterpret_cast<char*>(Australia_Sydney), Australia_Sydney_len},
+
+ // Other zones named in tests but which should fail to load.
+ {"Invalid/TimeZone", nullptr, 0},
+ {"", nullptr, 0},
+
+ // Also allow for loading the local time zone under TZ=US/Pacific.
+ {"US/Pacific", //
+ reinterpret_cast<char*>(America_Los_Angeles), America_Los_Angeles_len},
+
+ // Allows use of the local time zone from a system-specific location.
+#ifdef _MSC_VER
+ {"localtime", //
+ reinterpret_cast<char*>(America_Los_Angeles), America_Los_Angeles_len},
+#else
+ {"/etc/localtime", //
+ reinterpret_cast<char*>(America_Los_Angeles), America_Los_Angeles_len},
+#endif
+};
+
+class TestZoneInfoSource : public cctz::ZoneInfoSource {
+ public:
+ TestZoneInfoSource(const char* data, std::size_t size)
+ : data_(data), end_(data + size) {}
+
+ std::size_t Read(void* ptr, std::size_t size) override {
+ const std::size_t len = std::min<std::size_t>(size, end_ - data_);
+ memcpy(ptr, data_, len);
+ data_ += len;
+ return len;
+ }
+
+ int Skip(std::size_t offset) override {
+ data_ += std::min<std::size_t>(offset, end_ - data_);
+ return 0;
+ }
+
+ private:
+ const char* data_;
+ const char* const end_;
+};
+
+std::unique_ptr<cctz::ZoneInfoSource> TestFactory(
+ const std::string& name,
+ const std::function<std::unique_ptr<cctz::ZoneInfoSource>(
+ const std::string& name)>& /*fallback_factory*/) {
+ for (const ZoneInfo& zoneinfo : kZoneInfo) {
+ if (name == zoneinfo.name) {
+ if (zoneinfo.data == nullptr) return nullptr;
+ return std::unique_ptr<cctz::ZoneInfoSource>(
+ new TestZoneInfoSource(zoneinfo.data, zoneinfo.length));
+ }
+ }
+ ABSL_RAW_LOG(FATAL, "Unexpected time zone \"%s\" in test", name.c_str());
+ return nullptr;
+}
+
+} // namespace
+
+#if !defined(__MINGW32__)
+// MinGW does not support the weak symbol extension mechanism.
+ZoneInfoSourceFactory zone_info_source_factory = TestFactory;
+#endif
+
+} // namespace cctz_extension
+} // namespace time_internal
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/time/internal/test_util.h b/third_party/abseil/src/absl/time/internal/test_util.h
new file mode 100644
index 0000000..5c4bf1f
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/test_util.h
@@ -0,0 +1,33 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_TIME_INTERNAL_TEST_UTIL_H_
+#define ABSL_TIME_INTERNAL_TEST_UTIL_H_
+
+#include <string>
+
+#include "absl/time/time.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace time_internal {
+
+// Loads the named timezone, but dies on any failure.
+absl::TimeZone LoadTimeZone(const std::string& name);
+
+} // namespace time_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_TIME_INTERNAL_TEST_UTIL_H_
diff --git a/third_party/abseil/src/absl/time/internal/zoneinfo.inc b/third_party/abseil/src/absl/time/internal/zoneinfo.inc
new file mode 100644
index 0000000..bfed829
--- /dev/null
+++ b/third_party/abseil/src/absl/time/internal/zoneinfo.inc
@@ -0,0 +1,729 @@
+unsigned char America_Los_Angeles[] = {
+ 0x54, 0x5a, 0x69, 0x66, 0x32, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x05,
+ 0x00, 0x00, 0x00, 0x05, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xba,
+ 0x00, 0x00, 0x00, 0x05, 0x00, 0x00, 0x00, 0x14, 0x80, 0x00, 0x00, 0x00,
+ 0x9e, 0xa6, 0x48, 0xa0, 0x9f, 0xbb, 0x15, 0x90, 0xa0, 0x86, 0x2a, 0xa0,
+ 0xa1, 0x9a, 0xf7, 0x90, 0xcb, 0x89, 0x1a, 0xa0, 0xd2, 0x23, 0xf4, 0x70,
+ 0xd2, 0x61, 0x26, 0x10, 0xd6, 0xfe, 0x74, 0x5c, 0xd8, 0x80, 0xad, 0x90,
+ 0xda, 0xfe, 0xc3, 0x90, 0xdb, 0xc0, 0x90, 0x10, 0xdc, 0xde, 0xa5, 0x90,
+ 0xdd, 0xa9, 0xac, 0x90, 0xde, 0xbe, 0x87, 0x90, 0xdf, 0x89, 0x8e, 0x90,
+ 0xe0, 0x9e, 0x69, 0x90, 0xe1, 0x69, 0x70, 0x90, 0xe2, 0x7e, 0x4b, 0x90,
+ 0xe3, 0x49, 0x52, 0x90, 0xe4, 0x5e, 0x2d, 0x90, 0xe5, 0x29, 0x34, 0x90,
+ 0xe6, 0x47, 0x4a, 0x10, 0xe7, 0x12, 0x51, 0x10, 0xe8, 0x27, 0x2c, 0x10,
+ 0xe8, 0xf2, 0x33, 0x10, 0xea, 0x07, 0x0e, 0x10, 0xea, 0xd2, 0x15, 0x10,
+ 0xeb, 0xe6, 0xf0, 0x10, 0xec, 0xb1, 0xf7, 0x10, 0xed, 0xc6, 0xd2, 0x10,
+ 0xee, 0x91, 0xd9, 0x10, 0xef, 0xaf, 0xee, 0x90, 0xf0, 0x71, 0xbb, 0x10,
+ 0xf1, 0x8f, 0xd0, 0x90, 0xf2, 0x7f, 0xc1, 0x90, 0xf3, 0x6f, 0xb2, 0x90,
+ 0xf4, 0x5f, 0xa3, 0x90, 0xf5, 0x4f, 0x94, 0x90, 0xf6, 0x3f, 0x85, 0x90,
+ 0xf7, 0x2f, 0x76, 0x90, 0xf8, 0x28, 0xa2, 0x10, 0xf9, 0x0f, 0x58, 0x90,
+ 0xfa, 0x08, 0x84, 0x10, 0xfa, 0xf8, 0x83, 0x20, 0xfb, 0xe8, 0x66, 0x10,
+ 0xfc, 0xd8, 0x65, 0x20, 0xfd, 0xc8, 0x48, 0x10, 0xfe, 0xb8, 0x47, 0x20,
+ 0xff, 0xa8, 0x2a, 0x10, 0x00, 0x98, 0x29, 0x20, 0x01, 0x88, 0x0c, 0x10,
+ 0x02, 0x78, 0x0b, 0x20, 0x03, 0x71, 0x28, 0x90, 0x04, 0x61, 0x27, 0xa0,
+ 0x05, 0x51, 0x0a, 0x90, 0x06, 0x41, 0x09, 0xa0, 0x07, 0x30, 0xec, 0x90,
+ 0x07, 0x8d, 0x43, 0xa0, 0x09, 0x10, 0xce, 0x90, 0x09, 0xad, 0xbf, 0x20,
+ 0x0a, 0xf0, 0xb0, 0x90, 0x0b, 0xe0, 0xaf, 0xa0, 0x0c, 0xd9, 0xcd, 0x10,
+ 0x0d, 0xc0, 0x91, 0xa0, 0x0e, 0xb9, 0xaf, 0x10, 0x0f, 0xa9, 0xae, 0x20,
+ 0x10, 0x99, 0x91, 0x10, 0x11, 0x89, 0x90, 0x20, 0x12, 0x79, 0x73, 0x10,
+ 0x13, 0x69, 0x72, 0x20, 0x14, 0x59, 0x55, 0x10, 0x15, 0x49, 0x54, 0x20,
+ 0x16, 0x39, 0x37, 0x10, 0x17, 0x29, 0x36, 0x20, 0x18, 0x22, 0x53, 0x90,
+ 0x19, 0x09, 0x18, 0x20, 0x1a, 0x02, 0x35, 0x90, 0x1a, 0xf2, 0x34, 0xa0,
+ 0x1b, 0xe2, 0x17, 0x90, 0x1c, 0xd2, 0x16, 0xa0, 0x1d, 0xc1, 0xf9, 0x90,
+ 0x1e, 0xb1, 0xf8, 0xa0, 0x1f, 0xa1, 0xdb, 0x90, 0x20, 0x76, 0x2b, 0x20,
+ 0x21, 0x81, 0xbd, 0x90, 0x22, 0x56, 0x0d, 0x20, 0x23, 0x6a, 0xda, 0x10,
+ 0x24, 0x35, 0xef, 0x20, 0x25, 0x4a, 0xbc, 0x10, 0x26, 0x15, 0xd1, 0x20,
+ 0x27, 0x2a, 0x9e, 0x10, 0x27, 0xfe, 0xed, 0xa0, 0x29, 0x0a, 0x80, 0x10,
+ 0x29, 0xde, 0xcf, 0xa0, 0x2a, 0xea, 0x62, 0x10, 0x2b, 0xbe, 0xb1, 0xa0,
+ 0x2c, 0xd3, 0x7e, 0x90, 0x2d, 0x9e, 0x93, 0xa0, 0x2e, 0xb3, 0x60, 0x90,
+ 0x2f, 0x7e, 0x75, 0xa0, 0x30, 0x93, 0x42, 0x90, 0x31, 0x67, 0x92, 0x20,
+ 0x32, 0x73, 0x24, 0x90, 0x33, 0x47, 0x74, 0x20, 0x34, 0x53, 0x06, 0x90,
+ 0x35, 0x27, 0x56, 0x20, 0x36, 0x32, 0xe8, 0x90, 0x37, 0x07, 0x38, 0x20,
+ 0x38, 0x1c, 0x05, 0x10, 0x38, 0xe7, 0x1a, 0x20, 0x39, 0xfb, 0xe7, 0x10,
+ 0x3a, 0xc6, 0xfc, 0x20, 0x3b, 0xdb, 0xc9, 0x10, 0x3c, 0xb0, 0x18, 0xa0,
+ 0x3d, 0xbb, 0xab, 0x10, 0x3e, 0x8f, 0xfa, 0xa0, 0x3f, 0x9b, 0x8d, 0x10,
+ 0x40, 0x6f, 0xdc, 0xa0, 0x41, 0x84, 0xa9, 0x90, 0x42, 0x4f, 0xbe, 0xa0,
+ 0x43, 0x64, 0x8b, 0x90, 0x44, 0x2f, 0xa0, 0xa0, 0x45, 0x44, 0x6d, 0x90,
+ 0x45, 0xf3, 0xd3, 0x20, 0x47, 0x2d, 0x8a, 0x10, 0x47, 0xd3, 0xb5, 0x20,
+ 0x49, 0x0d, 0x6c, 0x10, 0x49, 0xb3, 0x97, 0x20, 0x4a, 0xed, 0x4e, 0x10,
+ 0x4b, 0x9c, 0xb3, 0xa0, 0x4c, 0xd6, 0x6a, 0x90, 0x4d, 0x7c, 0x95, 0xa0,
+ 0x4e, 0xb6, 0x4c, 0x90, 0x4f, 0x5c, 0x77, 0xa0, 0x50, 0x96, 0x2e, 0x90,
+ 0x51, 0x3c, 0x59, 0xa0, 0x52, 0x76, 0x10, 0x90, 0x53, 0x1c, 0x3b, 0xa0,
+ 0x54, 0x55, 0xf2, 0x90, 0x54, 0xfc, 0x1d, 0xa0, 0x56, 0x35, 0xd4, 0x90,
+ 0x56, 0xe5, 0x3a, 0x20, 0x58, 0x1e, 0xf1, 0x10, 0x58, 0xc5, 0x1c, 0x20,
+ 0x59, 0xfe, 0xd3, 0x10, 0x5a, 0xa4, 0xfe, 0x20, 0x5b, 0xde, 0xb5, 0x10,
+ 0x5c, 0x84, 0xe0, 0x20, 0x5d, 0xbe, 0x97, 0x10, 0x5e, 0x64, 0xc2, 0x20,
+ 0x5f, 0x9e, 0x79, 0x10, 0x60, 0x4d, 0xde, 0xa0, 0x61, 0x87, 0x95, 0x90,
+ 0x62, 0x2d, 0xc0, 0xa0, 0x63, 0x67, 0x77, 0x90, 0x64, 0x0d, 0xa2, 0xa0,
+ 0x65, 0x47, 0x59, 0x90, 0x65, 0xed, 0x84, 0xa0, 0x67, 0x27, 0x3b, 0x90,
+ 0x67, 0xcd, 0x66, 0xa0, 0x69, 0x07, 0x1d, 0x90, 0x69, 0xad, 0x48, 0xa0,
+ 0x6a, 0xe6, 0xff, 0x90, 0x6b, 0x96, 0x65, 0x20, 0x6c, 0xd0, 0x1c, 0x10,
+ 0x6d, 0x76, 0x47, 0x20, 0x6e, 0xaf, 0xfe, 0x10, 0x6f, 0x56, 0x29, 0x20,
+ 0x70, 0x8f, 0xe0, 0x10, 0x71, 0x36, 0x0b, 0x20, 0x72, 0x6f, 0xc2, 0x10,
+ 0x73, 0x15, 0xed, 0x20, 0x74, 0x4f, 0xa4, 0x10, 0x74, 0xff, 0x09, 0xa0,
+ 0x76, 0x38, 0xc0, 0x90, 0x76, 0xde, 0xeb, 0xa0, 0x78, 0x18, 0xa2, 0x90,
+ 0x78, 0xbe, 0xcd, 0xa0, 0x79, 0xf8, 0x84, 0x90, 0x7a, 0x9e, 0xaf, 0xa0,
+ 0x7b, 0xd8, 0x66, 0x90, 0x7c, 0x7e, 0x91, 0xa0, 0x7d, 0xb8, 0x48, 0x90,
+ 0x7e, 0x5e, 0x73, 0xa0, 0x7f, 0x98, 0x2a, 0x90, 0x02, 0x01, 0x02, 0x01,
+ 0x02, 0x03, 0x04, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02,
+ 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02,
+ 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02,
+ 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02,
+ 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02,
+ 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02,
+ 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02,
+ 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02,
+ 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02,
+ 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02,
+ 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02,
+ 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02,
+ 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02,
+ 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02,
+ 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02,
+ 0x01, 0x02, 0xff, 0xff, 0x91, 0x26, 0x00, 0x00, 0xff, 0xff, 0x9d, 0x90,
+ 0x01, 0x04, 0xff, 0xff, 0x8f, 0x80, 0x00, 0x08, 0xff, 0xff, 0x9d, 0x90,
+ 0x01, 0x0c, 0xff, 0xff, 0x9d, 0x90, 0x01, 0x10, 0x4c, 0x4d, 0x54, 0x00,
+ 0x50, 0x44, 0x54, 0x00, 0x50, 0x53, 0x54, 0x00, 0x50, 0x57, 0x54, 0x00,
+ 0x50, 0x50, 0x54, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,
+ 0x00, 0x01, 0x54, 0x5a, 0x69, 0x66, 0x32, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x05, 0x00, 0x00, 0x00, 0x05, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0xbb, 0x00, 0x00, 0x00, 0x05, 0x00, 0x00, 0x00, 0x14, 0xf8, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0x5e, 0x04,
+ 0x1a, 0xc0, 0xff, 0xff, 0xff, 0xff, 0x9e, 0xa6, 0x48, 0xa0, 0xff, 0xff,
+ 0xff, 0xff, 0x9f, 0xbb, 0x15, 0x90, 0xff, 0xff, 0xff, 0xff, 0xa0, 0x86,
+ 0x2a, 0xa0, 0xff, 0xff, 0xff, 0xff, 0xa1, 0x9a, 0xf7, 0x90, 0xff, 0xff,
+ 0xff, 0xff, 0xcb, 0x89, 0x1a, 0xa0, 0xff, 0xff, 0xff, 0xff, 0xd2, 0x23,
+ 0xf4, 0x70, 0xff, 0xff, 0xff, 0xff, 0xd2, 0x61, 0x26, 0x10, 0xff, 0xff,
+ 0xff, 0xff, 0xd6, 0xfe, 0x74, 0x5c, 0xff, 0xff, 0xff, 0xff, 0xd8, 0x80,
+ 0xad, 0x90, 0xff, 0xff, 0xff, 0xff, 0xda, 0xfe, 0xc3, 0x90, 0xff, 0xff,
+ 0xff, 0xff, 0xdb, 0xc0, 0x90, 0x10, 0xff, 0xff, 0xff, 0xff, 0xdc, 0xde,
+ 0xa5, 0x90, 0xff, 0xff, 0xff, 0xff, 0xdd, 0xa9, 0xac, 0x90, 0xff, 0xff,
+ 0xff, 0xff, 0xde, 0xbe, 0x87, 0x90, 0xff, 0xff, 0xff, 0xff, 0xdf, 0x89,
+ 0x8e, 0x90, 0xff, 0xff, 0xff, 0xff, 0xe0, 0x9e, 0x69, 0x90, 0xff, 0xff,
+ 0xff, 0xff, 0xe1, 0x69, 0x70, 0x90, 0xff, 0xff, 0xff, 0xff, 0xe2, 0x7e,
+ 0x4b, 0x90, 0xff, 0xff, 0xff, 0xff, 0xe3, 0x49, 0x52, 0x90, 0xff, 0xff,
+ 0xff, 0xff, 0xe4, 0x5e, 0x2d, 0x90, 0xff, 0xff, 0xff, 0xff, 0xe5, 0x29,
+ 0x34, 0x90, 0xff, 0xff, 0xff, 0xff, 0xe6, 0x47, 0x4a, 0x10, 0xff, 0xff,
+ 0xff, 0xff, 0xe7, 0x12, 0x51, 0x10, 0xff, 0xff, 0xff, 0xff, 0xe8, 0x27,
+ 0x2c, 0x10, 0xff, 0xff, 0xff, 0xff, 0xe8, 0xf2, 0x33, 0x10, 0xff, 0xff,
+ 0xff, 0xff, 0xea, 0x07, 0x0e, 0x10, 0xff, 0xff, 0xff, 0xff, 0xea, 0xd2,
+ 0x15, 0x10, 0xff, 0xff, 0xff, 0xff, 0xeb, 0xe6, 0xf0, 0x10, 0xff, 0xff,
+ 0xff, 0xff, 0xec, 0xb1, 0xf7, 0x10, 0xff, 0xff, 0xff, 0xff, 0xed, 0xc6,
+ 0xd2, 0x10, 0xff, 0xff, 0xff, 0xff, 0xee, 0x91, 0xd9, 0x10, 0xff, 0xff,
+ 0xff, 0xff, 0xef, 0xaf, 0xee, 0x90, 0xff, 0xff, 0xff, 0xff, 0xf0, 0x71,
+ 0xbb, 0x10, 0xff, 0xff, 0xff, 0xff, 0xf1, 0x8f, 0xd0, 0x90, 0xff, 0xff,
+ 0xff, 0xff, 0xf2, 0x7f, 0xc1, 0x90, 0xff, 0xff, 0xff, 0xff, 0xf3, 0x6f,
+ 0xb2, 0x90, 0xff, 0xff, 0xff, 0xff, 0xf4, 0x5f, 0xa3, 0x90, 0xff, 0xff,
+ 0xff, 0xff, 0xf5, 0x4f, 0x94, 0x90, 0xff, 0xff, 0xff, 0xff, 0xf6, 0x3f,
+ 0x85, 0x90, 0xff, 0xff, 0xff, 0xff, 0xf7, 0x2f, 0x76, 0x90, 0xff, 0xff,
+ 0xff, 0xff, 0xf8, 0x28, 0xa2, 0x10, 0xff, 0xff, 0xff, 0xff, 0xf9, 0x0f,
+ 0x58, 0x90, 0xff, 0xff, 0xff, 0xff, 0xfa, 0x08, 0x84, 0x10, 0xff, 0xff,
+ 0xff, 0xff, 0xfa, 0xf8, 0x83, 0x20, 0xff, 0xff, 0xff, 0xff, 0xfb, 0xe8,
+ 0x66, 0x10, 0xff, 0xff, 0xff, 0xff, 0xfc, 0xd8, 0x65, 0x20, 0xff, 0xff,
+ 0xff, 0xff, 0xfd, 0xc8, 0x48, 0x10, 0xff, 0xff, 0xff, 0xff, 0xfe, 0xb8,
+ 0x47, 0x20, 0xff, 0xff, 0xff, 0xff, 0xff, 0xa8, 0x2a, 0x10, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x98, 0x29, 0x20, 0x00, 0x00, 0x00, 0x00, 0x01, 0x88,
+ 0x0c, 0x10, 0x00, 0x00, 0x00, 0x00, 0x02, 0x78, 0x0b, 0x20, 0x00, 0x00,
+ 0x00, 0x00, 0x03, 0x71, 0x28, 0x90, 0x00, 0x00, 0x00, 0x00, 0x04, 0x61,
+ 0x27, 0xa0, 0x00, 0x00, 0x00, 0x00, 0x05, 0x51, 0x0a, 0x90, 0x00, 0x00,
+ 0x00, 0x00, 0x06, 0x41, 0x09, 0xa0, 0x00, 0x00, 0x00, 0x00, 0x07, 0x30,
+ 0xec, 0x90, 0x00, 0x00, 0x00, 0x00, 0x07, 0x8d, 0x43, 0xa0, 0x00, 0x00,
+ 0x00, 0x00, 0x09, 0x10, 0xce, 0x90, 0x00, 0x00, 0x00, 0x00, 0x09, 0xad,
+ 0xbf, 0x20, 0x00, 0x00, 0x00, 0x00, 0x0a, 0xf0, 0xb0, 0x90, 0x00, 0x00,
+ 0x00, 0x00, 0x0b, 0xe0, 0xaf, 0xa0, 0x00, 0x00, 0x00, 0x00, 0x0c, 0xd9,
+ 0xcd, 0x10, 0x00, 0x00, 0x00, 0x00, 0x0d, 0xc0, 0x91, 0xa0, 0x00, 0x00,
+ 0x00, 0x00, 0x0e, 0xb9, 0xaf, 0x10, 0x00, 0x00, 0x00, 0x00, 0x0f, 0xa9,
+ 0xae, 0x20, 0x00, 0x00, 0x00, 0x00, 0x10, 0x99, 0x91, 0x10, 0x00, 0x00,
+ 0x00, 0x00, 0x11, 0x89, 0x90, 0x20, 0x00, 0x00, 0x00, 0x00, 0x12, 0x79,
+ 0x73, 0x10, 0x00, 0x00, 0x00, 0x00, 0x13, 0x69, 0x72, 0x20, 0x00, 0x00,
+ 0x00, 0x00, 0x14, 0x59, 0x55, 0x10, 0x00, 0x00, 0x00, 0x00, 0x15, 0x49,
+ 0x54, 0x20, 0x00, 0x00, 0x00, 0x00, 0x16, 0x39, 0x37, 0x10, 0x00, 0x00,
+ 0x00, 0x00, 0x17, 0x29, 0x36, 0x20, 0x00, 0x00, 0x00, 0x00, 0x18, 0x22,
+ 0x53, 0x90, 0x00, 0x00, 0x00, 0x00, 0x19, 0x09, 0x18, 0x20, 0x00, 0x00,
+ 0x00, 0x00, 0x1a, 0x02, 0x35, 0x90, 0x00, 0x00, 0x00, 0x00, 0x1a, 0xf2,
+ 0x34, 0xa0, 0x00, 0x00, 0x00, 0x00, 0x1b, 0xe2, 0x17, 0x90, 0x00, 0x00,
+ 0x00, 0x00, 0x1c, 0xd2, 0x16, 0xa0, 0x00, 0x00, 0x00, 0x00, 0x1d, 0xc1,
+ 0xf9, 0x90, 0x00, 0x00, 0x00, 0x00, 0x1e, 0xb1, 0xf8, 0xa0, 0x00, 0x00,
+ 0x00, 0x00, 0x1f, 0xa1, 0xdb, 0x90, 0x00, 0x00, 0x00, 0x00, 0x20, 0x76,
+ 0x2b, 0x20, 0x00, 0x00, 0x00, 0x00, 0x21, 0x81, 0xbd, 0x90, 0x00, 0x00,
+ 0x00, 0x00, 0x22, 0x56, 0x0d, 0x20, 0x00, 0x00, 0x00, 0x00, 0x23, 0x6a,
+ 0xda, 0x10, 0x00, 0x00, 0x00, 0x00, 0x24, 0x35, 0xef, 0x20, 0x00, 0x00,
+ 0x00, 0x00, 0x25, 0x4a, 0xbc, 0x10, 0x00, 0x00, 0x00, 0x00, 0x26, 0x15,
+ 0xd1, 0x20, 0x00, 0x00, 0x00, 0x00, 0x27, 0x2a, 0x9e, 0x10, 0x00, 0x00,
+ 0x00, 0x00, 0x27, 0xfe, 0xed, 0xa0, 0x00, 0x00, 0x00, 0x00, 0x29, 0x0a,
+ 0x80, 0x10, 0x00, 0x00, 0x00, 0x00, 0x29, 0xde, 0xcf, 0xa0, 0x00, 0x00,
+ 0x00, 0x00, 0x2a, 0xea, 0x62, 0x10, 0x00, 0x00, 0x00, 0x00, 0x2b, 0xbe,
+ 0xb1, 0xa0, 0x00, 0x00, 0x00, 0x00, 0x2c, 0xd3, 0x7e, 0x90, 0x00, 0x00,
+ 0x00, 0x00, 0x2d, 0x9e, 0x93, 0xa0, 0x00, 0x00, 0x00, 0x00, 0x2e, 0xb3,
+ 0x60, 0x90, 0x00, 0x00, 0x00, 0x00, 0x2f, 0x7e, 0x75, 0xa0, 0x00, 0x00,
+ 0x00, 0x00, 0x30, 0x93, 0x42, 0x90, 0x00, 0x00, 0x00, 0x00, 0x31, 0x67,
+ 0x92, 0x20, 0x00, 0x00, 0x00, 0x00, 0x32, 0x73, 0x24, 0x90, 0x00, 0x00,
+ 0x00, 0x00, 0x33, 0x47, 0x74, 0x20, 0x00, 0x00, 0x00, 0x00, 0x34, 0x53,
+ 0x06, 0x90, 0x00, 0x00, 0x00, 0x00, 0x35, 0x27, 0x56, 0x20, 0x00, 0x00,
+ 0x00, 0x00, 0x36, 0x32, 0xe8, 0x90, 0x00, 0x00, 0x00, 0x00, 0x37, 0x07,
+ 0x38, 0x20, 0x00, 0x00, 0x00, 0x00, 0x38, 0x1c, 0x05, 0x10, 0x00, 0x00,
+ 0x00, 0x00, 0x38, 0xe7, 0x1a, 0x20, 0x00, 0x00, 0x00, 0x00, 0x39, 0xfb,
+ 0xe7, 0x10, 0x00, 0x00, 0x00, 0x00, 0x3a, 0xc6, 0xfc, 0x20, 0x00, 0x00,
+ 0x00, 0x00, 0x3b, 0xdb, 0xc9, 0x10, 0x00, 0x00, 0x00, 0x00, 0x3c, 0xb0,
+ 0x18, 0xa0, 0x00, 0x00, 0x00, 0x00, 0x3d, 0xbb, 0xab, 0x10, 0x00, 0x00,
+ 0x00, 0x00, 0x3e, 0x8f, 0xfa, 0xa0, 0x00, 0x00, 0x00, 0x00, 0x3f, 0x9b,
+ 0x8d, 0x10, 0x00, 0x00, 0x00, 0x00, 0x40, 0x6f, 0xdc, 0xa0, 0x00, 0x00,
+ 0x00, 0x00, 0x41, 0x84, 0xa9, 0x90, 0x00, 0x00, 0x00, 0x00, 0x42, 0x4f,
+ 0xbe, 0xa0, 0x00, 0x00, 0x00, 0x00, 0x43, 0x64, 0x8b, 0x90, 0x00, 0x00,
+ 0x00, 0x00, 0x44, 0x2f, 0xa0, 0xa0, 0x00, 0x00, 0x00, 0x00, 0x45, 0x44,
+ 0x6d, 0x90, 0x00, 0x00, 0x00, 0x00, 0x45, 0xf3, 0xd3, 0x20, 0x00, 0x00,
+ 0x00, 0x00, 0x47, 0x2d, 0x8a, 0x10, 0x00, 0x00, 0x00, 0x00, 0x47, 0xd3,
+ 0xb5, 0x20, 0x00, 0x00, 0x00, 0x00, 0x49, 0x0d, 0x6c, 0x10, 0x00, 0x00,
+ 0x00, 0x00, 0x49, 0xb3, 0x97, 0x20, 0x00, 0x00, 0x00, 0x00, 0x4a, 0xed,
+ 0x4e, 0x10, 0x00, 0x00, 0x00, 0x00, 0x4b, 0x9c, 0xb3, 0xa0, 0x00, 0x00,
+ 0x00, 0x00, 0x4c, 0xd6, 0x6a, 0x90, 0x00, 0x00, 0x00, 0x00, 0x4d, 0x7c,
+ 0x95, 0xa0, 0x00, 0x00, 0x00, 0x00, 0x4e, 0xb6, 0x4c, 0x90, 0x00, 0x00,
+ 0x00, 0x00, 0x4f, 0x5c, 0x77, 0xa0, 0x00, 0x00, 0x00, 0x00, 0x50, 0x96,
+ 0x2e, 0x90, 0x00, 0x00, 0x00, 0x00, 0x51, 0x3c, 0x59, 0xa0, 0x00, 0x00,
+ 0x00, 0x00, 0x52, 0x76, 0x10, 0x90, 0x00, 0x00, 0x00, 0x00, 0x53, 0x1c,
+ 0x3b, 0xa0, 0x00, 0x00, 0x00, 0x00, 0x54, 0x55, 0xf2, 0x90, 0x00, 0x00,
+ 0x00, 0x00, 0x54, 0xfc, 0x1d, 0xa0, 0x00, 0x00, 0x00, 0x00, 0x56, 0x35,
+ 0xd4, 0x90, 0x00, 0x00, 0x00, 0x00, 0x56, 0xe5, 0x3a, 0x20, 0x00, 0x00,
+ 0x00, 0x00, 0x58, 0x1e, 0xf1, 0x10, 0x00, 0x00, 0x00, 0x00, 0x58, 0xc5,
+ 0x1c, 0x20, 0x00, 0x00, 0x00, 0x00, 0x59, 0xfe, 0xd3, 0x10, 0x00, 0x00,
+ 0x00, 0x00, 0x5a, 0xa4, 0xfe, 0x20, 0x00, 0x00, 0x00, 0x00, 0x5b, 0xde,
+ 0xb5, 0x10, 0x00, 0x00, 0x00, 0x00, 0x5c, 0x84, 0xe0, 0x20, 0x00, 0x00,
+ 0x00, 0x00, 0x5d, 0xbe, 0x97, 0x10, 0x00, 0x00, 0x00, 0x00, 0x5e, 0x64,
+ 0xc2, 0x20, 0x00, 0x00, 0x00, 0x00, 0x5f, 0x9e, 0x79, 0x10, 0x00, 0x00,
+ 0x00, 0x00, 0x60, 0x4d, 0xde, 0xa0, 0x00, 0x00, 0x00, 0x00, 0x61, 0x87,
+ 0x95, 0x90, 0x00, 0x00, 0x00, 0x00, 0x62, 0x2d, 0xc0, 0xa0, 0x00, 0x00,
+ 0x00, 0x00, 0x63, 0x67, 0x77, 0x90, 0x00, 0x00, 0x00, 0x00, 0x64, 0x0d,
+ 0xa2, 0xa0, 0x00, 0x00, 0x00, 0x00, 0x65, 0x47, 0x59, 0x90, 0x00, 0x00,
+ 0x00, 0x00, 0x65, 0xed, 0x84, 0xa0, 0x00, 0x00, 0x00, 0x00, 0x67, 0x27,
+ 0x3b, 0x90, 0x00, 0x00, 0x00, 0x00, 0x67, 0xcd, 0x66, 0xa0, 0x00, 0x00,
+ 0x00, 0x00, 0x69, 0x07, 0x1d, 0x90, 0x00, 0x00, 0x00, 0x00, 0x69, 0xad,
+ 0x48, 0xa0, 0x00, 0x00, 0x00, 0x00, 0x6a, 0xe6, 0xff, 0x90, 0x00, 0x00,
+ 0x00, 0x00, 0x6b, 0x96, 0x65, 0x20, 0x00, 0x00, 0x00, 0x00, 0x6c, 0xd0,
+ 0x1c, 0x10, 0x00, 0x00, 0x00, 0x00, 0x6d, 0x76, 0x47, 0x20, 0x00, 0x00,
+ 0x00, 0x00, 0x6e, 0xaf, 0xfe, 0x10, 0x00, 0x00, 0x00, 0x00, 0x6f, 0x56,
+ 0x29, 0x20, 0x00, 0x00, 0x00, 0x00, 0x70, 0x8f, 0xe0, 0x10, 0x00, 0x00,
+ 0x00, 0x00, 0x71, 0x36, 0x0b, 0x20, 0x00, 0x00, 0x00, 0x00, 0x72, 0x6f,
+ 0xc2, 0x10, 0x00, 0x00, 0x00, 0x00, 0x73, 0x15, 0xed, 0x20, 0x00, 0x00,
+ 0x00, 0x00, 0x74, 0x4f, 0xa4, 0x10, 0x00, 0x00, 0x00, 0x00, 0x74, 0xff,
+ 0x09, 0xa0, 0x00, 0x00, 0x00, 0x00, 0x76, 0x38, 0xc0, 0x90, 0x00, 0x00,
+ 0x00, 0x00, 0x76, 0xde, 0xeb, 0xa0, 0x00, 0x00, 0x00, 0x00, 0x78, 0x18,
+ 0xa2, 0x90, 0x00, 0x00, 0x00, 0x00, 0x78, 0xbe, 0xcd, 0xa0, 0x00, 0x00,
+ 0x00, 0x00, 0x79, 0xf8, 0x84, 0x90, 0x00, 0x00, 0x00, 0x00, 0x7a, 0x9e,
+ 0xaf, 0xa0, 0x00, 0x00, 0x00, 0x00, 0x7b, 0xd8, 0x66, 0x90, 0x00, 0x00,
+ 0x00, 0x00, 0x7c, 0x7e, 0x91, 0xa0, 0x00, 0x00, 0x00, 0x00, 0x7d, 0xb8,
+ 0x48, 0x90, 0x00, 0x00, 0x00, 0x00, 0x7e, 0x5e, 0x73, 0xa0, 0x00, 0x00,
+ 0x00, 0x00, 0x7f, 0x98, 0x2a, 0x90, 0x00, 0x02, 0x01, 0x02, 0x01, 0x02,
+ 0x03, 0x04, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01,
+ 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01,
+ 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01,
+ 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01,
+ 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01,
+ 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01,
+ 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01,
+ 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01,
+ 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01,
+ 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01,
+ 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01,
+ 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01,
+ 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01,
+ 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01,
+ 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01,
+ 0x02, 0xff, 0xff, 0x91, 0x26, 0x00, 0x00, 0xff, 0xff, 0x9d, 0x90, 0x01,
+ 0x04, 0xff, 0xff, 0x8f, 0x80, 0x00, 0x08, 0xff, 0xff, 0x9d, 0x90, 0x01,
+ 0x0c, 0xff, 0xff, 0x9d, 0x90, 0x01, 0x10, 0x4c, 0x4d, 0x54, 0x00, 0x50,
+ 0x44, 0x54, 0x00, 0x50, 0x53, 0x54, 0x00, 0x50, 0x57, 0x54, 0x00, 0x50,
+ 0x50, 0x54, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00,
+ 0x01, 0x0a, 0x50, 0x53, 0x54, 0x38, 0x50, 0x44, 0x54, 0x2c, 0x4d, 0x33,
+ 0x2e, 0x32, 0x2e, 0x30, 0x2c, 0x4d, 0x31, 0x31, 0x2e, 0x31, 0x2e, 0x30,
+ 0x0a
+};
+unsigned int America_Los_Angeles_len = 2845;
+unsigned char America_New_York[] = {
+ 0x54, 0x5a, 0x69, 0x66, 0x32, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x05,
+ 0x00, 0x00, 0x00, 0x05, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xec,
+ 0x00, 0x00, 0x00, 0x05, 0x00, 0x00, 0x00, 0x14, 0x80, 0x00, 0x00, 0x00,
+ 0x9e, 0xa6, 0x1e, 0x70, 0x9f, 0xba, 0xeb, 0x60, 0xa0, 0x86, 0x00, 0x70,
+ 0xa1, 0x9a, 0xcd, 0x60, 0xa2, 0x65, 0xe2, 0x70, 0xa3, 0x83, 0xe9, 0xe0,
+ 0xa4, 0x6a, 0xae, 0x70, 0xa5, 0x35, 0xa7, 0x60, 0xa6, 0x53, 0xca, 0xf0,
+ 0xa7, 0x15, 0x89, 0x60, 0xa8, 0x33, 0xac, 0xf0, 0xa8, 0xfe, 0xa5, 0xe0,
+ 0xaa, 0x13, 0x8e, 0xf0, 0xaa, 0xde, 0x87, 0xe0, 0xab, 0xf3, 0x70, 0xf0,
+ 0xac, 0xbe, 0x69, 0xe0, 0xad, 0xd3, 0x52, 0xf0, 0xae, 0x9e, 0x4b, 0xe0,
+ 0xaf, 0xb3, 0x34, 0xf0, 0xb0, 0x7e, 0x2d, 0xe0, 0xb1, 0x9c, 0x51, 0x70,
+ 0xb2, 0x67, 0x4a, 0x60, 0xb3, 0x7c, 0x33, 0x70, 0xb4, 0x47, 0x2c, 0x60,
+ 0xb5, 0x5c, 0x15, 0x70, 0xb6, 0x27, 0x0e, 0x60, 0xb7, 0x3b, 0xf7, 0x70,
+ 0xb8, 0x06, 0xf0, 0x60, 0xb9, 0x1b, 0xd9, 0x70, 0xb9, 0xe6, 0xd2, 0x60,
+ 0xbb, 0x04, 0xf5, 0xf0, 0xbb, 0xc6, 0xb4, 0x60, 0xbc, 0xe4, 0xd7, 0xf0,
+ 0xbd, 0xaf, 0xd0, 0xe0, 0xbe, 0xc4, 0xb9, 0xf0, 0xbf, 0x8f, 0xb2, 0xe0,
+ 0xc0, 0xa4, 0x9b, 0xf0, 0xc1, 0x6f, 0x94, 0xe0, 0xc2, 0x84, 0x7d, 0xf0,
+ 0xc3, 0x4f, 0x76, 0xe0, 0xc4, 0x64, 0x5f, 0xf0, 0xc5, 0x2f, 0x58, 0xe0,
+ 0xc6, 0x4d, 0x7c, 0x70, 0xc7, 0x0f, 0x3a, 0xe0, 0xc8, 0x2d, 0x5e, 0x70,
+ 0xc8, 0xf8, 0x57, 0x60, 0xca, 0x0d, 0x40, 0x70, 0xca, 0xd8, 0x39, 0x60,
+ 0xcb, 0x88, 0xf0, 0x70, 0xd2, 0x23, 0xf4, 0x70, 0xd2, 0x60, 0xfb, 0xe0,
+ 0xd3, 0x75, 0xe4, 0xf0, 0xd4, 0x40, 0xdd, 0xe0, 0xd5, 0x55, 0xc6, 0xf0,
+ 0xd6, 0x20, 0xbf, 0xe0, 0xd7, 0x35, 0xa8, 0xf0, 0xd8, 0x00, 0xa1, 0xe0,
+ 0xd9, 0x15, 0x8a, 0xf0, 0xd9, 0xe0, 0x83, 0xe0, 0xda, 0xfe, 0xa7, 0x70,
+ 0xdb, 0xc0, 0x65, 0xe0, 0xdc, 0xde, 0x89, 0x70, 0xdd, 0xa9, 0x82, 0x60,
+ 0xde, 0xbe, 0x6b, 0x70, 0xdf, 0x89, 0x64, 0x60, 0xe0, 0x9e, 0x4d, 0x70,
+ 0xe1, 0x69, 0x46, 0x60, 0xe2, 0x7e, 0x2f, 0x70, 0xe3, 0x49, 0x28, 0x60,
+ 0xe4, 0x5e, 0x11, 0x70, 0xe5, 0x57, 0x2e, 0xe0, 0xe6, 0x47, 0x2d, 0xf0,
+ 0xe7, 0x37, 0x10, 0xe0, 0xe8, 0x27, 0x0f, 0xf0, 0xe9, 0x16, 0xf2, 0xe0,
+ 0xea, 0x06, 0xf1, 0xf0, 0xea, 0xf6, 0xd4, 0xe0, 0xeb, 0xe6, 0xd3, 0xf0,
+ 0xec, 0xd6, 0xb6, 0xe0, 0xed, 0xc6, 0xb5, 0xf0, 0xee, 0xbf, 0xd3, 0x60,
+ 0xef, 0xaf, 0xd2, 0x70, 0xf0, 0x9f, 0xb5, 0x60, 0xf1, 0x8f, 0xb4, 0x70,
+ 0xf2, 0x7f, 0x97, 0x60, 0xf3, 0x6f, 0x96, 0x70, 0xf4, 0x5f, 0x79, 0x60,
+ 0xf5, 0x4f, 0x78, 0x70, 0xf6, 0x3f, 0x5b, 0x60, 0xf7, 0x2f, 0x5a, 0x70,
+ 0xf8, 0x28, 0x77, 0xe0, 0xf9, 0x0f, 0x3c, 0x70, 0xfa, 0x08, 0x59, 0xe0,
+ 0xfa, 0xf8, 0x58, 0xf0, 0xfb, 0xe8, 0x3b, 0xe0, 0xfc, 0xd8, 0x3a, 0xf0,
+ 0xfd, 0xc8, 0x1d, 0xe0, 0xfe, 0xb8, 0x1c, 0xf0, 0xff, 0xa7, 0xff, 0xe0,
+ 0x00, 0x97, 0xfe, 0xf0, 0x01, 0x87, 0xe1, 0xe0, 0x02, 0x77, 0xe0, 0xf0,
+ 0x03, 0x70, 0xfe, 0x60, 0x04, 0x60, 0xfd, 0x70, 0x05, 0x50, 0xe0, 0x60,
+ 0x06, 0x40, 0xdf, 0x70, 0x07, 0x30, 0xc2, 0x60, 0x07, 0x8d, 0x19, 0x70,
+ 0x09, 0x10, 0xa4, 0x60, 0x09, 0xad, 0x94, 0xf0, 0x0a, 0xf0, 0x86, 0x60,
+ 0x0b, 0xe0, 0x85, 0x70, 0x0c, 0xd9, 0xa2, 0xe0, 0x0d, 0xc0, 0x67, 0x70,
+ 0x0e, 0xb9, 0x84, 0xe0, 0x0f, 0xa9, 0x83, 0xf0, 0x10, 0x99, 0x66, 0xe0,
+ 0x11, 0x89, 0x65, 0xf0, 0x12, 0x79, 0x48, 0xe0, 0x13, 0x69, 0x47, 0xf0,
+ 0x14, 0x59, 0x2a, 0xe0, 0x15, 0x49, 0x29, 0xf0, 0x16, 0x39, 0x0c, 0xe0,
+ 0x17, 0x29, 0x0b, 0xf0, 0x18, 0x22, 0x29, 0x60, 0x19, 0x08, 0xed, 0xf0,
+ 0x1a, 0x02, 0x0b, 0x60, 0x1a, 0xf2, 0x0a, 0x70, 0x1b, 0xe1, 0xed, 0x60,
+ 0x1c, 0xd1, 0xec, 0x70, 0x1d, 0xc1, 0xcf, 0x60, 0x1e, 0xb1, 0xce, 0x70,
+ 0x1f, 0xa1, 0xb1, 0x60, 0x20, 0x76, 0x00, 0xf0, 0x21, 0x81, 0x93, 0x60,
+ 0x22, 0x55, 0xe2, 0xf0, 0x23, 0x6a, 0xaf, 0xe0, 0x24, 0x35, 0xc4, 0xf0,
+ 0x25, 0x4a, 0x91, 0xe0, 0x26, 0x15, 0xa6, 0xf0, 0x27, 0x2a, 0x73, 0xe0,
+ 0x27, 0xfe, 0xc3, 0x70, 0x29, 0x0a, 0x55, 0xe0, 0x29, 0xde, 0xa5, 0x70,
+ 0x2a, 0xea, 0x37, 0xe0, 0x2b, 0xbe, 0x87, 0x70, 0x2c, 0xd3, 0x54, 0x60,
+ 0x2d, 0x9e, 0x69, 0x70, 0x2e, 0xb3, 0x36, 0x60, 0x2f, 0x7e, 0x4b, 0x70,
+ 0x30, 0x93, 0x18, 0x60, 0x31, 0x67, 0x67, 0xf0, 0x32, 0x72, 0xfa, 0x60,
+ 0x33, 0x47, 0x49, 0xf0, 0x34, 0x52, 0xdc, 0x60, 0x35, 0x27, 0x2b, 0xf0,
+ 0x36, 0x32, 0xbe, 0x60, 0x37, 0x07, 0x0d, 0xf0, 0x38, 0x1b, 0xda, 0xe0,
+ 0x38, 0xe6, 0xef, 0xf0, 0x39, 0xfb, 0xbc, 0xe0, 0x3a, 0xc6, 0xd1, 0xf0,
+ 0x3b, 0xdb, 0x9e, 0xe0, 0x3c, 0xaf, 0xee, 0x70, 0x3d, 0xbb, 0x80, 0xe0,
+ 0x3e, 0x8f, 0xd0, 0x70, 0x3f, 0x9b, 0x62, 0xe0, 0x40, 0x6f, 0xb2, 0x70,
+ 0x41, 0x84, 0x7f, 0x60, 0x42, 0x4f, 0x94, 0x70, 0x43, 0x64, 0x61, 0x60,
+ 0x44, 0x2f, 0x76, 0x70, 0x45, 0x44, 0x43, 0x60, 0x45, 0xf3, 0xa8, 0xf0,
+ 0x47, 0x2d, 0x5f, 0xe0, 0x47, 0xd3, 0x8a, 0xf0, 0x49, 0x0d, 0x41, 0xe0,
+ 0x49, 0xb3, 0x6c, 0xf0, 0x4a, 0xed, 0x23, 0xe0, 0x4b, 0x9c, 0x89, 0x70,
+ 0x4c, 0xd6, 0x40, 0x60, 0x4d, 0x7c, 0x6b, 0x70, 0x4e, 0xb6, 0x22, 0x60,
+ 0x4f, 0x5c, 0x4d, 0x70, 0x50, 0x96, 0x04, 0x60, 0x51, 0x3c, 0x2f, 0x70,
+ 0x52, 0x75, 0xe6, 0x60, 0x53, 0x1c, 0x11, 0x70, 0x54, 0x55, 0xc8, 0x60,
+ 0x54, 0xfb, 0xf3, 0x70, 0x56, 0x35, 0xaa, 0x60, 0x56, 0xe5, 0x0f, 0xf0,
+ 0x58, 0x1e, 0xc6, 0xe0, 0x58, 0xc4, 0xf1, 0xf0, 0x59, 0xfe, 0xa8, 0xe0,
+ 0x5a, 0xa4, 0xd3, 0xf0, 0x5b, 0xde, 0x8a, 0xe0, 0x5c, 0x84, 0xb5, 0xf0,
+ 0x5d, 0xbe, 0x6c, 0xe0, 0x5e, 0x64, 0x97, 0xf0, 0x5f, 0x9e, 0x4e, 0xe0,
+ 0x60, 0x4d, 0xb4, 0x70, 0x61, 0x87, 0x6b, 0x60, 0x62, 0x2d, 0x96, 0x70,
+ 0x63, 0x67, 0x4d, 0x60, 0x64, 0x0d, 0x78, 0x70, 0x65, 0x47, 0x2f, 0x60,
+ 0x65, 0xed, 0x5a, 0x70, 0x67, 0x27, 0x11, 0x60, 0x67, 0xcd, 0x3c, 0x70,
+ 0x69, 0x06, 0xf3, 0x60, 0x69, 0xad, 0x1e, 0x70, 0x6a, 0xe6, 0xd5, 0x60,
+ 0x6b, 0x96, 0x3a, 0xf0, 0x6c, 0xcf, 0xf1, 0xe0, 0x6d, 0x76, 0x1c, 0xf0,
+ 0x6e, 0xaf, 0xd3, 0xe0, 0x6f, 0x55, 0xfe, 0xf0, 0x70, 0x8f, 0xb5, 0xe0,
+ 0x71, 0x35, 0xe0, 0xf0, 0x72, 0x6f, 0x97, 0xe0, 0x73, 0x15, 0xc2, 0xf0,
+ 0x74, 0x4f, 0x79, 0xe0, 0x74, 0xfe, 0xdf, 0x70, 0x76, 0x38, 0x96, 0x60,
+ 0x76, 0xde, 0xc1, 0x70, 0x78, 0x18, 0x78, 0x60, 0x78, 0xbe, 0xa3, 0x70,
+ 0x79, 0xf8, 0x5a, 0x60, 0x7a, 0x9e, 0x85, 0x70, 0x7b, 0xd8, 0x3c, 0x60,
+ 0x7c, 0x7e, 0x67, 0x70, 0x7d, 0xb8, 0x1e, 0x60, 0x7e, 0x5e, 0x49, 0x70,
+ 0x7f, 0x98, 0x00, 0x60, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01,
+ 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01,
+ 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01,
+ 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01,
+ 0x02, 0x01, 0x02, 0x01, 0x02, 0x03, 0x04, 0x02, 0x01, 0x02, 0x01, 0x02,
+ 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02,
+ 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02,
+ 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02,
+ 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02,
+ 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02,
+ 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02,
+ 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02,
+ 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02,
+ 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02,
+ 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02,
+ 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02,
+ 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02,
+ 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02,
+ 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02,
+ 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02,
+ 0xff, 0xff, 0xba, 0x9e, 0x00, 0x00, 0xff, 0xff, 0xc7, 0xc0, 0x01, 0x04,
+ 0xff, 0xff, 0xb9, 0xb0, 0x00, 0x08, 0xff, 0xff, 0xc7, 0xc0, 0x01, 0x0c,
+ 0xff, 0xff, 0xc7, 0xc0, 0x01, 0x10, 0x4c, 0x4d, 0x54, 0x00, 0x45, 0x44,
+ 0x54, 0x00, 0x45, 0x53, 0x54, 0x00, 0x45, 0x57, 0x54, 0x00, 0x45, 0x50,
+ 0x54, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x01,
+ 0x54, 0x5a, 0x69, 0x66, 0x32, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x05,
+ 0x00, 0x00, 0x00, 0x05, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xed,
+ 0x00, 0x00, 0x00, 0x05, 0x00, 0x00, 0x00, 0x14, 0xf8, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0x5e, 0x03, 0xf0, 0x90,
+ 0xff, 0xff, 0xff, 0xff, 0x9e, 0xa6, 0x1e, 0x70, 0xff, 0xff, 0xff, 0xff,
+ 0x9f, 0xba, 0xeb, 0x60, 0xff, 0xff, 0xff, 0xff, 0xa0, 0x86, 0x00, 0x70,
+ 0xff, 0xff, 0xff, 0xff, 0xa1, 0x9a, 0xcd, 0x60, 0xff, 0xff, 0xff, 0xff,
+ 0xa2, 0x65, 0xe2, 0x70, 0xff, 0xff, 0xff, 0xff, 0xa3, 0x83, 0xe9, 0xe0,
+ 0xff, 0xff, 0xff, 0xff, 0xa4, 0x6a, 0xae, 0x70, 0xff, 0xff, 0xff, 0xff,
+ 0xa5, 0x35, 0xa7, 0x60, 0xff, 0xff, 0xff, 0xff, 0xa6, 0x53, 0xca, 0xf0,
+ 0xff, 0xff, 0xff, 0xff, 0xa7, 0x15, 0x89, 0x60, 0xff, 0xff, 0xff, 0xff,
+ 0xa8, 0x33, 0xac, 0xf0, 0xff, 0xff, 0xff, 0xff, 0xa8, 0xfe, 0xa5, 0xe0,
+ 0xff, 0xff, 0xff, 0xff, 0xaa, 0x13, 0x8e, 0xf0, 0xff, 0xff, 0xff, 0xff,
+ 0xaa, 0xde, 0x87, 0xe0, 0xff, 0xff, 0xff, 0xff, 0xab, 0xf3, 0x70, 0xf0,
+ 0xff, 0xff, 0xff, 0xff, 0xac, 0xbe, 0x69, 0xe0, 0xff, 0xff, 0xff, 0xff,
+ 0xad, 0xd3, 0x52, 0xf0, 0xff, 0xff, 0xff, 0xff, 0xae, 0x9e, 0x4b, 0xe0,
+ 0xff, 0xff, 0xff, 0xff, 0xaf, 0xb3, 0x34, 0xf0, 0xff, 0xff, 0xff, 0xff,
+ 0xb0, 0x7e, 0x2d, 0xe0, 0xff, 0xff, 0xff, 0xff, 0xb1, 0x9c, 0x51, 0x70,
+ 0xff, 0xff, 0xff, 0xff, 0xb2, 0x67, 0x4a, 0x60, 0xff, 0xff, 0xff, 0xff,
+ 0xb3, 0x7c, 0x33, 0x70, 0xff, 0xff, 0xff, 0xff, 0xb4, 0x47, 0x2c, 0x60,
+ 0xff, 0xff, 0xff, 0xff, 0xb5, 0x5c, 0x15, 0x70, 0xff, 0xff, 0xff, 0xff,
+ 0xb6, 0x27, 0x0e, 0x60, 0xff, 0xff, 0xff, 0xff, 0xb7, 0x3b, 0xf7, 0x70,
+ 0xff, 0xff, 0xff, 0xff, 0xb8, 0x06, 0xf0, 0x60, 0xff, 0xff, 0xff, 0xff,
+ 0xb9, 0x1b, 0xd9, 0x70, 0xff, 0xff, 0xff, 0xff, 0xb9, 0xe6, 0xd2, 0x60,
+ 0xff, 0xff, 0xff, 0xff, 0xbb, 0x04, 0xf5, 0xf0, 0xff, 0xff, 0xff, 0xff,
+ 0xbb, 0xc6, 0xb4, 0x60, 0xff, 0xff, 0xff, 0xff, 0xbc, 0xe4, 0xd7, 0xf0,
+ 0xff, 0xff, 0xff, 0xff, 0xbd, 0xaf, 0xd0, 0xe0, 0xff, 0xff, 0xff, 0xff,
+ 0xbe, 0xc4, 0xb9, 0xf0, 0xff, 0xff, 0xff, 0xff, 0xbf, 0x8f, 0xb2, 0xe0,
+ 0xff, 0xff, 0xff, 0xff, 0xc0, 0xa4, 0x9b, 0xf0, 0xff, 0xff, 0xff, 0xff,
+ 0xc1, 0x6f, 0x94, 0xe0, 0xff, 0xff, 0xff, 0xff, 0xc2, 0x84, 0x7d, 0xf0,
+ 0xff, 0xff, 0xff, 0xff, 0xc3, 0x4f, 0x76, 0xe0, 0xff, 0xff, 0xff, 0xff,
+ 0xc4, 0x64, 0x5f, 0xf0, 0xff, 0xff, 0xff, 0xff, 0xc5, 0x2f, 0x58, 0xe0,
+ 0xff, 0xff, 0xff, 0xff, 0xc6, 0x4d, 0x7c, 0x70, 0xff, 0xff, 0xff, 0xff,
+ 0xc7, 0x0f, 0x3a, 0xe0, 0xff, 0xff, 0xff, 0xff, 0xc8, 0x2d, 0x5e, 0x70,
+ 0xff, 0xff, 0xff, 0xff, 0xc8, 0xf8, 0x57, 0x60, 0xff, 0xff, 0xff, 0xff,
+ 0xca, 0x0d, 0x40, 0x70, 0xff, 0xff, 0xff, 0xff, 0xca, 0xd8, 0x39, 0x60,
+ 0xff, 0xff, 0xff, 0xff, 0xcb, 0x88, 0xf0, 0x70, 0xff, 0xff, 0xff, 0xff,
+ 0xd2, 0x23, 0xf4, 0x70, 0xff, 0xff, 0xff, 0xff, 0xd2, 0x60, 0xfb, 0xe0,
+ 0xff, 0xff, 0xff, 0xff, 0xd3, 0x75, 0xe4, 0xf0, 0xff, 0xff, 0xff, 0xff,
+ 0xd4, 0x40, 0xdd, 0xe0, 0xff, 0xff, 0xff, 0xff, 0xd5, 0x55, 0xc6, 0xf0,
+ 0xff, 0xff, 0xff, 0xff, 0xd6, 0x20, 0xbf, 0xe0, 0xff, 0xff, 0xff, 0xff,
+ 0xd7, 0x35, 0xa8, 0xf0, 0xff, 0xff, 0xff, 0xff, 0xd8, 0x00, 0xa1, 0xe0,
+ 0xff, 0xff, 0xff, 0xff, 0xd9, 0x15, 0x8a, 0xf0, 0xff, 0xff, 0xff, 0xff,
+ 0xd9, 0xe0, 0x83, 0xe0, 0xff, 0xff, 0xff, 0xff, 0xda, 0xfe, 0xa7, 0x70,
+ 0xff, 0xff, 0xff, 0xff, 0xdb, 0xc0, 0x65, 0xe0, 0xff, 0xff, 0xff, 0xff,
+ 0xdc, 0xde, 0x89, 0x70, 0xff, 0xff, 0xff, 0xff, 0xdd, 0xa9, 0x82, 0x60,
+ 0xff, 0xff, 0xff, 0xff, 0xde, 0xbe, 0x6b, 0x70, 0xff, 0xff, 0xff, 0xff,
+ 0xdf, 0x89, 0x64, 0x60, 0xff, 0xff, 0xff, 0xff, 0xe0, 0x9e, 0x4d, 0x70,
+ 0xff, 0xff, 0xff, 0xff, 0xe1, 0x69, 0x46, 0x60, 0xff, 0xff, 0xff, 0xff,
+ 0xe2, 0x7e, 0x2f, 0x70, 0xff, 0xff, 0xff, 0xff, 0xe3, 0x49, 0x28, 0x60,
+ 0xff, 0xff, 0xff, 0xff, 0xe4, 0x5e, 0x11, 0x70, 0xff, 0xff, 0xff, 0xff,
+ 0xe5, 0x57, 0x2e, 0xe0, 0xff, 0xff, 0xff, 0xff, 0xe6, 0x47, 0x2d, 0xf0,
+ 0xff, 0xff, 0xff, 0xff, 0xe7, 0x37, 0x10, 0xe0, 0xff, 0xff, 0xff, 0xff,
+ 0xe8, 0x27, 0x0f, 0xf0, 0xff, 0xff, 0xff, 0xff, 0xe9, 0x16, 0xf2, 0xe0,
+ 0xff, 0xff, 0xff, 0xff, 0xea, 0x06, 0xf1, 0xf0, 0xff, 0xff, 0xff, 0xff,
+ 0xea, 0xf6, 0xd4, 0xe0, 0xff, 0xff, 0xff, 0xff, 0xeb, 0xe6, 0xd3, 0xf0,
+ 0xff, 0xff, 0xff, 0xff, 0xec, 0xd6, 0xb6, 0xe0, 0xff, 0xff, 0xff, 0xff,
+ 0xed, 0xc6, 0xb5, 0xf0, 0xff, 0xff, 0xff, 0xff, 0xee, 0xbf, 0xd3, 0x60,
+ 0xff, 0xff, 0xff, 0xff, 0xef, 0xaf, 0xd2, 0x70, 0xff, 0xff, 0xff, 0xff,
+ 0xf0, 0x9f, 0xb5, 0x60, 0xff, 0xff, 0xff, 0xff, 0xf1, 0x8f, 0xb4, 0x70,
+ 0xff, 0xff, 0xff, 0xff, 0xf2, 0x7f, 0x97, 0x60, 0xff, 0xff, 0xff, 0xff,
+ 0xf3, 0x6f, 0x96, 0x70, 0xff, 0xff, 0xff, 0xff, 0xf4, 0x5f, 0x79, 0x60,
+ 0xff, 0xff, 0xff, 0xff, 0xf5, 0x4f, 0x78, 0x70, 0xff, 0xff, 0xff, 0xff,
+ 0xf6, 0x3f, 0x5b, 0x60, 0xff, 0xff, 0xff, 0xff, 0xf7, 0x2f, 0x5a, 0x70,
+ 0xff, 0xff, 0xff, 0xff, 0xf8, 0x28, 0x77, 0xe0, 0xff, 0xff, 0xff, 0xff,
+ 0xf9, 0x0f, 0x3c, 0x70, 0xff, 0xff, 0xff, 0xff, 0xfa, 0x08, 0x59, 0xe0,
+ 0xff, 0xff, 0xff, 0xff, 0xfa, 0xf8, 0x58, 0xf0, 0xff, 0xff, 0xff, 0xff,
+ 0xfb, 0xe8, 0x3b, 0xe0, 0xff, 0xff, 0xff, 0xff, 0xfc, 0xd8, 0x3a, 0xf0,
+ 0xff, 0xff, 0xff, 0xff, 0xfd, 0xc8, 0x1d, 0xe0, 0xff, 0xff, 0xff, 0xff,
+ 0xfe, 0xb8, 0x1c, 0xf0, 0xff, 0xff, 0xff, 0xff, 0xff, 0xa7, 0xff, 0xe0,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x97, 0xfe, 0xf0, 0x00, 0x00, 0x00, 0x00,
+ 0x01, 0x87, 0xe1, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x02, 0x77, 0xe0, 0xf0,
+ 0x00, 0x00, 0x00, 0x00, 0x03, 0x70, 0xfe, 0x60, 0x00, 0x00, 0x00, 0x00,
+ 0x04, 0x60, 0xfd, 0x70, 0x00, 0x00, 0x00, 0x00, 0x05, 0x50, 0xe0, 0x60,
+ 0x00, 0x00, 0x00, 0x00, 0x06, 0x40, 0xdf, 0x70, 0x00, 0x00, 0x00, 0x00,
+ 0x07, 0x30, 0xc2, 0x60, 0x00, 0x00, 0x00, 0x00, 0x07, 0x8d, 0x19, 0x70,
+ 0x00, 0x00, 0x00, 0x00, 0x09, 0x10, 0xa4, 0x60, 0x00, 0x00, 0x00, 0x00,
+ 0x09, 0xad, 0x94, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x0a, 0xf0, 0x86, 0x60,
+ 0x00, 0x00, 0x00, 0x00, 0x0b, 0xe0, 0x85, 0x70, 0x00, 0x00, 0x00, 0x00,
+ 0x0c, 0xd9, 0xa2, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x0d, 0xc0, 0x67, 0x70,
+ 0x00, 0x00, 0x00, 0x00, 0x0e, 0xb9, 0x84, 0xe0, 0x00, 0x00, 0x00, 0x00,
+ 0x0f, 0xa9, 0x83, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x10, 0x99, 0x66, 0xe0,
+ 0x00, 0x00, 0x00, 0x00, 0x11, 0x89, 0x65, 0xf0, 0x00, 0x00, 0x00, 0x00,
+ 0x12, 0x79, 0x48, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x13, 0x69, 0x47, 0xf0,
+ 0x00, 0x00, 0x00, 0x00, 0x14, 0x59, 0x2a, 0xe0, 0x00, 0x00, 0x00, 0x00,
+ 0x15, 0x49, 0x29, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x16, 0x39, 0x0c, 0xe0,
+ 0x00, 0x00, 0x00, 0x00, 0x17, 0x29, 0x0b, 0xf0, 0x00, 0x00, 0x00, 0x00,
+ 0x18, 0x22, 0x29, 0x60, 0x00, 0x00, 0x00, 0x00, 0x19, 0x08, 0xed, 0xf0,
+ 0x00, 0x00, 0x00, 0x00, 0x1a, 0x02, 0x0b, 0x60, 0x00, 0x00, 0x00, 0x00,
+ 0x1a, 0xf2, 0x0a, 0x70, 0x00, 0x00, 0x00, 0x00, 0x1b, 0xe1, 0xed, 0x60,
+ 0x00, 0x00, 0x00, 0x00, 0x1c, 0xd1, 0xec, 0x70, 0x00, 0x00, 0x00, 0x00,
+ 0x1d, 0xc1, 0xcf, 0x60, 0x00, 0x00, 0x00, 0x00, 0x1e, 0xb1, 0xce, 0x70,
+ 0x00, 0x00, 0x00, 0x00, 0x1f, 0xa1, 0xb1, 0x60, 0x00, 0x00, 0x00, 0x00,
+ 0x20, 0x76, 0x00, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x21, 0x81, 0x93, 0x60,
+ 0x00, 0x00, 0x00, 0x00, 0x22, 0x55, 0xe2, 0xf0, 0x00, 0x00, 0x00, 0x00,
+ 0x23, 0x6a, 0xaf, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x24, 0x35, 0xc4, 0xf0,
+ 0x00, 0x00, 0x00, 0x00, 0x25, 0x4a, 0x91, 0xe0, 0x00, 0x00, 0x00, 0x00,
+ 0x26, 0x15, 0xa6, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x27, 0x2a, 0x73, 0xe0,
+ 0x00, 0x00, 0x00, 0x00, 0x27, 0xfe, 0xc3, 0x70, 0x00, 0x00, 0x00, 0x00,
+ 0x29, 0x0a, 0x55, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x29, 0xde, 0xa5, 0x70,
+ 0x00, 0x00, 0x00, 0x00, 0x2a, 0xea, 0x37, 0xe0, 0x00, 0x00, 0x00, 0x00,
+ 0x2b, 0xbe, 0x87, 0x70, 0x00, 0x00, 0x00, 0x00, 0x2c, 0xd3, 0x54, 0x60,
+ 0x00, 0x00, 0x00, 0x00, 0x2d, 0x9e, 0x69, 0x70, 0x00, 0x00, 0x00, 0x00,
+ 0x2e, 0xb3, 0x36, 0x60, 0x00, 0x00, 0x00, 0x00, 0x2f, 0x7e, 0x4b, 0x70,
+ 0x00, 0x00, 0x00, 0x00, 0x30, 0x93, 0x18, 0x60, 0x00, 0x00, 0x00, 0x00,
+ 0x31, 0x67, 0x67, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x32, 0x72, 0xfa, 0x60,
+ 0x00, 0x00, 0x00, 0x00, 0x33, 0x47, 0x49, 0xf0, 0x00, 0x00, 0x00, 0x00,
+ 0x34, 0x52, 0xdc, 0x60, 0x00, 0x00, 0x00, 0x00, 0x35, 0x27, 0x2b, 0xf0,
+ 0x00, 0x00, 0x00, 0x00, 0x36, 0x32, 0xbe, 0x60, 0x00, 0x00, 0x00, 0x00,
+ 0x37, 0x07, 0x0d, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x38, 0x1b, 0xda, 0xe0,
+ 0x00, 0x00, 0x00, 0x00, 0x38, 0xe6, 0xef, 0xf0, 0x00, 0x00, 0x00, 0x00,
+ 0x39, 0xfb, 0xbc, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x3a, 0xc6, 0xd1, 0xf0,
+ 0x00, 0x00, 0x00, 0x00, 0x3b, 0xdb, 0x9e, 0xe0, 0x00, 0x00, 0x00, 0x00,
+ 0x3c, 0xaf, 0xee, 0x70, 0x00, 0x00, 0x00, 0x00, 0x3d, 0xbb, 0x80, 0xe0,
+ 0x00, 0x00, 0x00, 0x00, 0x3e, 0x8f, 0xd0, 0x70, 0x00, 0x00, 0x00, 0x00,
+ 0x3f, 0x9b, 0x62, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x40, 0x6f, 0xb2, 0x70,
+ 0x00, 0x00, 0x00, 0x00, 0x41, 0x84, 0x7f, 0x60, 0x00, 0x00, 0x00, 0x00,
+ 0x42, 0x4f, 0x94, 0x70, 0x00, 0x00, 0x00, 0x00, 0x43, 0x64, 0x61, 0x60,
+ 0x00, 0x00, 0x00, 0x00, 0x44, 0x2f, 0x76, 0x70, 0x00, 0x00, 0x00, 0x00,
+ 0x45, 0x44, 0x43, 0x60, 0x00, 0x00, 0x00, 0x00, 0x45, 0xf3, 0xa8, 0xf0,
+ 0x00, 0x00, 0x00, 0x00, 0x47, 0x2d, 0x5f, 0xe0, 0x00, 0x00, 0x00, 0x00,
+ 0x47, 0xd3, 0x8a, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x49, 0x0d, 0x41, 0xe0,
+ 0x00, 0x00, 0x00, 0x00, 0x49, 0xb3, 0x6c, 0xf0, 0x00, 0x00, 0x00, 0x00,
+ 0x4a, 0xed, 0x23, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x4b, 0x9c, 0x89, 0x70,
+ 0x00, 0x00, 0x00, 0x00, 0x4c, 0xd6, 0x40, 0x60, 0x00, 0x00, 0x00, 0x00,
+ 0x4d, 0x7c, 0x6b, 0x70, 0x00, 0x00, 0x00, 0x00, 0x4e, 0xb6, 0x22, 0x60,
+ 0x00, 0x00, 0x00, 0x00, 0x4f, 0x5c, 0x4d, 0x70, 0x00, 0x00, 0x00, 0x00,
+ 0x50, 0x96, 0x04, 0x60, 0x00, 0x00, 0x00, 0x00, 0x51, 0x3c, 0x2f, 0x70,
+ 0x00, 0x00, 0x00, 0x00, 0x52, 0x75, 0xe6, 0x60, 0x00, 0x00, 0x00, 0x00,
+ 0x53, 0x1c, 0x11, 0x70, 0x00, 0x00, 0x00, 0x00, 0x54, 0x55, 0xc8, 0x60,
+ 0x00, 0x00, 0x00, 0x00, 0x54, 0xfb, 0xf3, 0x70, 0x00, 0x00, 0x00, 0x00,
+ 0x56, 0x35, 0xaa, 0x60, 0x00, 0x00, 0x00, 0x00, 0x56, 0xe5, 0x0f, 0xf0,
+ 0x00, 0x00, 0x00, 0x00, 0x58, 0x1e, 0xc6, 0xe0, 0x00, 0x00, 0x00, 0x00,
+ 0x58, 0xc4, 0xf1, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x59, 0xfe, 0xa8, 0xe0,
+ 0x00, 0x00, 0x00, 0x00, 0x5a, 0xa4, 0xd3, 0xf0, 0x00, 0x00, 0x00, 0x00,
+ 0x5b, 0xde, 0x8a, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x5c, 0x84, 0xb5, 0xf0,
+ 0x00, 0x00, 0x00, 0x00, 0x5d, 0xbe, 0x6c, 0xe0, 0x00, 0x00, 0x00, 0x00,
+ 0x5e, 0x64, 0x97, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x5f, 0x9e, 0x4e, 0xe0,
+ 0x00, 0x00, 0x00, 0x00, 0x60, 0x4d, 0xb4, 0x70, 0x00, 0x00, 0x00, 0x00,
+ 0x61, 0x87, 0x6b, 0x60, 0x00, 0x00, 0x00, 0x00, 0x62, 0x2d, 0x96, 0x70,
+ 0x00, 0x00, 0x00, 0x00, 0x63, 0x67, 0x4d, 0x60, 0x00, 0x00, 0x00, 0x00,
+ 0x64, 0x0d, 0x78, 0x70, 0x00, 0x00, 0x00, 0x00, 0x65, 0x47, 0x2f, 0x60,
+ 0x00, 0x00, 0x00, 0x00, 0x65, 0xed, 0x5a, 0x70, 0x00, 0x00, 0x00, 0x00,
+ 0x67, 0x27, 0x11, 0x60, 0x00, 0x00, 0x00, 0x00, 0x67, 0xcd, 0x3c, 0x70,
+ 0x00, 0x00, 0x00, 0x00, 0x69, 0x06, 0xf3, 0x60, 0x00, 0x00, 0x00, 0x00,
+ 0x69, 0xad, 0x1e, 0x70, 0x00, 0x00, 0x00, 0x00, 0x6a, 0xe6, 0xd5, 0x60,
+ 0x00, 0x00, 0x00, 0x00, 0x6b, 0x96, 0x3a, 0xf0, 0x00, 0x00, 0x00, 0x00,
+ 0x6c, 0xcf, 0xf1, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x6d, 0x76, 0x1c, 0xf0,
+ 0x00, 0x00, 0x00, 0x00, 0x6e, 0xaf, 0xd3, 0xe0, 0x00, 0x00, 0x00, 0x00,
+ 0x6f, 0x55, 0xfe, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x70, 0x8f, 0xb5, 0xe0,
+ 0x00, 0x00, 0x00, 0x00, 0x71, 0x35, 0xe0, 0xf0, 0x00, 0x00, 0x00, 0x00,
+ 0x72, 0x6f, 0x97, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x73, 0x15, 0xc2, 0xf0,
+ 0x00, 0x00, 0x00, 0x00, 0x74, 0x4f, 0x79, 0xe0, 0x00, 0x00, 0x00, 0x00,
+ 0x74, 0xfe, 0xdf, 0x70, 0x00, 0x00, 0x00, 0x00, 0x76, 0x38, 0x96, 0x60,
+ 0x00, 0x00, 0x00, 0x00, 0x76, 0xde, 0xc1, 0x70, 0x00, 0x00, 0x00, 0x00,
+ 0x78, 0x18, 0x78, 0x60, 0x00, 0x00, 0x00, 0x00, 0x78, 0xbe, 0xa3, 0x70,
+ 0x00, 0x00, 0x00, 0x00, 0x79, 0xf8, 0x5a, 0x60, 0x00, 0x00, 0x00, 0x00,
+ 0x7a, 0x9e, 0x85, 0x70, 0x00, 0x00, 0x00, 0x00, 0x7b, 0xd8, 0x3c, 0x60,
+ 0x00, 0x00, 0x00, 0x00, 0x7c, 0x7e, 0x67, 0x70, 0x00, 0x00, 0x00, 0x00,
+ 0x7d, 0xb8, 0x1e, 0x60, 0x00, 0x00, 0x00, 0x00, 0x7e, 0x5e, 0x49, 0x70,
+ 0x00, 0x00, 0x00, 0x00, 0x7f, 0x98, 0x00, 0x60, 0x00, 0x02, 0x01, 0x02,
+ 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02,
+ 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02,
+ 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02,
+ 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x03, 0x04,
+ 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01,
+ 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01,
+ 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01,
+ 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01,
+ 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01,
+ 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01,
+ 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01,
+ 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01,
+ 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01,
+ 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01,
+ 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01,
+ 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01,
+ 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01,
+ 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01,
+ 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01,
+ 0x02, 0x01, 0x02, 0x01, 0x02, 0xff, 0xff, 0xba, 0x9e, 0x00, 0x00, 0xff,
+ 0xff, 0xc7, 0xc0, 0x01, 0x04, 0xff, 0xff, 0xb9, 0xb0, 0x00, 0x08, 0xff,
+ 0xff, 0xc7, 0xc0, 0x01, 0x0c, 0xff, 0xff, 0xc7, 0xc0, 0x01, 0x10, 0x4c,
+ 0x4d, 0x54, 0x00, 0x45, 0x44, 0x54, 0x00, 0x45, 0x53, 0x54, 0x00, 0x45,
+ 0x57, 0x54, 0x00, 0x45, 0x50, 0x54, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01,
+ 0x00, 0x00, 0x00, 0x00, 0x01, 0x0a, 0x45, 0x53, 0x54, 0x35, 0x45, 0x44,
+ 0x54, 0x2c, 0x4d, 0x33, 0x2e, 0x32, 0x2e, 0x30, 0x2c, 0x4d, 0x31, 0x31,
+ 0x2e, 0x31, 0x2e, 0x30, 0x0a
+};
+unsigned int America_New_York_len = 3545;
+unsigned char Australia_Sydney[] = {
+ 0x54, 0x5a, 0x69, 0x66, 0x32, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x05,
+ 0x00, 0x00, 0x00, 0x05, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x8e,
+ 0x00, 0x00, 0x00, 0x05, 0x00, 0x00, 0x00, 0x0e, 0x80, 0x00, 0x00, 0x00,
+ 0x9c, 0x4e, 0xa6, 0x9c, 0x9c, 0xbc, 0x20, 0xf0, 0xcb, 0x54, 0xb3, 0x00,
+ 0xcb, 0xc7, 0x57, 0x70, 0xcc, 0xb7, 0x56, 0x80, 0xcd, 0xa7, 0x39, 0x70,
+ 0xce, 0xa0, 0x73, 0x00, 0xcf, 0x87, 0x1b, 0x70, 0x03, 0x70, 0x39, 0x80,
+ 0x04, 0x0d, 0x1c, 0x00, 0x05, 0x50, 0x1b, 0x80, 0x05, 0xf6, 0x38, 0x80,
+ 0x07, 0x2f, 0xfd, 0x80, 0x07, 0xd6, 0x1a, 0x80, 0x09, 0x0f, 0xdf, 0x80,
+ 0x09, 0xb5, 0xfc, 0x80, 0x0a, 0xef, 0xc1, 0x80, 0x0b, 0x9f, 0x19, 0x00,
+ 0x0c, 0xd8, 0xde, 0x00, 0x0d, 0x7e, 0xfb, 0x00, 0x0e, 0xb8, 0xc0, 0x00,
+ 0x0f, 0x5e, 0xdd, 0x00, 0x10, 0x98, 0xa2, 0x00, 0x11, 0x3e, 0xbf, 0x00,
+ 0x12, 0x78, 0x84, 0x00, 0x13, 0x1e, 0xa1, 0x00, 0x14, 0x58, 0x66, 0x00,
+ 0x14, 0xfe, 0x83, 0x00, 0x16, 0x38, 0x48, 0x00, 0x17, 0x0c, 0x89, 0x80,
+ 0x18, 0x21, 0x64, 0x80, 0x18, 0xc7, 0x81, 0x80, 0x1a, 0x01, 0x46, 0x80,
+ 0x1a, 0xa7, 0x63, 0x80, 0x1b, 0xe1, 0x28, 0x80, 0x1c, 0x87, 0x45, 0x80,
+ 0x1d, 0xc1, 0x0a, 0x80, 0x1e, 0x79, 0x9c, 0x80, 0x1f, 0x97, 0xb2, 0x00,
+ 0x20, 0x59, 0x7e, 0x80, 0x21, 0x80, 0xce, 0x80, 0x22, 0x42, 0x9b, 0x00,
+ 0x23, 0x69, 0xeb, 0x00, 0x24, 0x22, 0x7d, 0x00, 0x25, 0x49, 0xcd, 0x00,
+ 0x25, 0xef, 0xea, 0x00, 0x27, 0x29, 0xaf, 0x00, 0x27, 0xcf, 0xcc, 0x00,
+ 0x29, 0x09, 0x91, 0x00, 0x29, 0xaf, 0xae, 0x00, 0x2a, 0xe9, 0x73, 0x00,
+ 0x2b, 0x98, 0xca, 0x80, 0x2c, 0xd2, 0x8f, 0x80, 0x2d, 0x78, 0xac, 0x80,
+ 0x2e, 0xb2, 0x71, 0x80, 0x2f, 0x58, 0x8e, 0x80, 0x30, 0x92, 0x53, 0x80,
+ 0x31, 0x5d, 0x5a, 0x80, 0x32, 0x72, 0x35, 0x80, 0x33, 0x3d, 0x3c, 0x80,
+ 0x34, 0x52, 0x17, 0x80, 0x35, 0x1d, 0x1e, 0x80, 0x36, 0x31, 0xf9, 0x80,
+ 0x36, 0xfd, 0x00, 0x80, 0x38, 0x1b, 0x16, 0x00, 0x38, 0xdc, 0xe2, 0x80,
+ 0x39, 0xa7, 0xe9, 0x80, 0x3a, 0xbc, 0xc4, 0x80, 0x3b, 0xda, 0xda, 0x00,
+ 0x3c, 0xa5, 0xe1, 0x00, 0x3d, 0xba, 0xbc, 0x00, 0x3e, 0x85, 0xc3, 0x00,
+ 0x3f, 0x9a, 0x9e, 0x00, 0x40, 0x65, 0xa5, 0x00, 0x41, 0x83, 0xba, 0x80,
+ 0x42, 0x45, 0x87, 0x00, 0x43, 0x63, 0x9c, 0x80, 0x44, 0x2e, 0xa3, 0x80,
+ 0x45, 0x43, 0x7e, 0x80, 0x46, 0x05, 0x4b, 0x00, 0x47, 0x23, 0x60, 0x80,
+ 0x47, 0xf7, 0xa2, 0x00, 0x48, 0xe7, 0x93, 0x00, 0x49, 0xd7, 0x84, 0x00,
+ 0x4a, 0xc7, 0x75, 0x00, 0x4b, 0xb7, 0x66, 0x00, 0x4c, 0xa7, 0x57, 0x00,
+ 0x4d, 0x97, 0x48, 0x00, 0x4e, 0x87, 0x39, 0x00, 0x4f, 0x77, 0x2a, 0x00,
+ 0x50, 0x70, 0x55, 0x80, 0x51, 0x60, 0x46, 0x80, 0x52, 0x50, 0x37, 0x80,
+ 0x53, 0x40, 0x28, 0x80, 0x54, 0x30, 0x19, 0x80, 0x55, 0x20, 0x0a, 0x80,
+ 0x56, 0x0f, 0xfb, 0x80, 0x56, 0xff, 0xec, 0x80, 0x57, 0xef, 0xdd, 0x80,
+ 0x58, 0xdf, 0xce, 0x80, 0x59, 0xcf, 0xbf, 0x80, 0x5a, 0xbf, 0xb0, 0x80,
+ 0x5b, 0xb8, 0xdc, 0x00, 0x5c, 0xa8, 0xcd, 0x00, 0x5d, 0x98, 0xbe, 0x00,
+ 0x5e, 0x88, 0xaf, 0x00, 0x5f, 0x78, 0xa0, 0x00, 0x60, 0x68, 0x91, 0x00,
+ 0x61, 0x58, 0x82, 0x00, 0x62, 0x48, 0x73, 0x00, 0x63, 0x38, 0x64, 0x00,
+ 0x64, 0x28, 0x55, 0x00, 0x65, 0x18, 0x46, 0x00, 0x66, 0x11, 0x71, 0x80,
+ 0x67, 0x01, 0x62, 0x80, 0x67, 0xf1, 0x53, 0x80, 0x68, 0xe1, 0x44, 0x80,
+ 0x69, 0xd1, 0x35, 0x80, 0x6a, 0xc1, 0x26, 0x80, 0x6b, 0xb1, 0x17, 0x80,
+ 0x6c, 0xa1, 0x08, 0x80, 0x6d, 0x90, 0xf9, 0x80, 0x6e, 0x80, 0xea, 0x80,
+ 0x6f, 0x70, 0xdb, 0x80, 0x70, 0x6a, 0x07, 0x00, 0x71, 0x59, 0xf8, 0x00,
+ 0x72, 0x49, 0xe9, 0x00, 0x73, 0x39, 0xda, 0x00, 0x74, 0x29, 0xcb, 0x00,
+ 0x75, 0x19, 0xbc, 0x00, 0x76, 0x09, 0xad, 0x00, 0x76, 0xf9, 0x9e, 0x00,
+ 0x77, 0xe9, 0x8f, 0x00, 0x78, 0xd9, 0x80, 0x00, 0x79, 0xc9, 0x71, 0x00,
+ 0x7a, 0xb9, 0x62, 0x00, 0x7b, 0xb2, 0x8d, 0x80, 0x7c, 0xa2, 0x7e, 0x80,
+ 0x7d, 0x92, 0x6f, 0x80, 0x7e, 0x82, 0x60, 0x80, 0x7f, 0x72, 0x51, 0x80,
+ 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02, 0x03, 0x04, 0x03,
+ 0x04, 0x03, 0x04, 0x03, 0x04, 0x03, 0x04, 0x03, 0x04, 0x03, 0x04, 0x03,
+ 0x04, 0x03, 0x04, 0x03, 0x04, 0x03, 0x04, 0x03, 0x04, 0x03, 0x04, 0x03,
+ 0x04, 0x03, 0x04, 0x03, 0x04, 0x03, 0x04, 0x03, 0x04, 0x03, 0x04, 0x03,
+ 0x04, 0x03, 0x04, 0x03, 0x04, 0x03, 0x04, 0x03, 0x04, 0x03, 0x04, 0x03,
+ 0x04, 0x03, 0x04, 0x03, 0x04, 0x03, 0x04, 0x03, 0x04, 0x03, 0x04, 0x03,
+ 0x04, 0x03, 0x04, 0x03, 0x04, 0x03, 0x04, 0x03, 0x04, 0x03, 0x04, 0x03,
+ 0x04, 0x03, 0x04, 0x03, 0x04, 0x03, 0x04, 0x03, 0x04, 0x03, 0x04, 0x03,
+ 0x04, 0x03, 0x04, 0x03, 0x04, 0x03, 0x04, 0x03, 0x04, 0x03, 0x04, 0x03,
+ 0x04, 0x03, 0x04, 0x03, 0x04, 0x03, 0x04, 0x03, 0x04, 0x03, 0x04, 0x03,
+ 0x04, 0x03, 0x04, 0x03, 0x04, 0x03, 0x04, 0x03, 0x04, 0x03, 0x04, 0x03,
+ 0x04, 0x03, 0x04, 0x03, 0x04, 0x03, 0x04, 0x03, 0x04, 0x03, 0x00, 0x00,
+ 0x8d, 0xc4, 0x00, 0x00, 0x00, 0x00, 0x9a, 0xb0, 0x01, 0x04, 0x00, 0x00,
+ 0x8c, 0xa0, 0x00, 0x09, 0x00, 0x00, 0x9a, 0xb0, 0x01, 0x04, 0x00, 0x00,
+ 0x8c, 0xa0, 0x00, 0x09, 0x4c, 0x4d, 0x54, 0x00, 0x41, 0x45, 0x44, 0x54,
+ 0x00, 0x41, 0x45, 0x53, 0x54, 0x00, 0x00, 0x00, 0x00, 0x01, 0x01, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x54, 0x5a, 0x69, 0x66, 0x32, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x05, 0x00, 0x00, 0x00, 0x05, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x8f, 0x00, 0x00, 0x00, 0x05, 0x00, 0x00, 0x00, 0x0e,
+ 0xf8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff,
+ 0x73, 0x16, 0x7f, 0x3c, 0xff, 0xff, 0xff, 0xff, 0x9c, 0x4e, 0xa6, 0x9c,
+ 0xff, 0xff, 0xff, 0xff, 0x9c, 0xbc, 0x20, 0xf0, 0xff, 0xff, 0xff, 0xff,
+ 0xcb, 0x54, 0xb3, 0x00, 0xff, 0xff, 0xff, 0xff, 0xcb, 0xc7, 0x57, 0x70,
+ 0xff, 0xff, 0xff, 0xff, 0xcc, 0xb7, 0x56, 0x80, 0xff, 0xff, 0xff, 0xff,
+ 0xcd, 0xa7, 0x39, 0x70, 0xff, 0xff, 0xff, 0xff, 0xce, 0xa0, 0x73, 0x00,
+ 0xff, 0xff, 0xff, 0xff, 0xcf, 0x87, 0x1b, 0x70, 0x00, 0x00, 0x00, 0x00,
+ 0x03, 0x70, 0x39, 0x80, 0x00, 0x00, 0x00, 0x00, 0x04, 0x0d, 0x1c, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x05, 0x50, 0x1b, 0x80, 0x00, 0x00, 0x00, 0x00,
+ 0x05, 0xf6, 0x38, 0x80, 0x00, 0x00, 0x00, 0x00, 0x07, 0x2f, 0xfd, 0x80,
+ 0x00, 0x00, 0x00, 0x00, 0x07, 0xd6, 0x1a, 0x80, 0x00, 0x00, 0x00, 0x00,
+ 0x09, 0x0f, 0xdf, 0x80, 0x00, 0x00, 0x00, 0x00, 0x09, 0xb5, 0xfc, 0x80,
+ 0x00, 0x00, 0x00, 0x00, 0x0a, 0xef, 0xc1, 0x80, 0x00, 0x00, 0x00, 0x00,
+ 0x0b, 0x9f, 0x19, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0c, 0xd8, 0xde, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x0d, 0x7e, 0xfb, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x0e, 0xb8, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0f, 0x5e, 0xdd, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x10, 0x98, 0xa2, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x11, 0x3e, 0xbf, 0x00, 0x00, 0x00, 0x00, 0x00, 0x12, 0x78, 0x84, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x13, 0x1e, 0xa1, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x14, 0x58, 0x66, 0x00, 0x00, 0x00, 0x00, 0x00, 0x14, 0xfe, 0x83, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x16, 0x38, 0x48, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x17, 0x0c, 0x89, 0x80, 0x00, 0x00, 0x00, 0x00, 0x18, 0x21, 0x64, 0x80,
+ 0x00, 0x00, 0x00, 0x00, 0x18, 0xc7, 0x81, 0x80, 0x00, 0x00, 0x00, 0x00,
+ 0x1a, 0x01, 0x46, 0x80, 0x00, 0x00, 0x00, 0x00, 0x1a, 0xa7, 0x63, 0x80,
+ 0x00, 0x00, 0x00, 0x00, 0x1b, 0xe1, 0x28, 0x80, 0x00, 0x00, 0x00, 0x00,
+ 0x1c, 0x87, 0x45, 0x80, 0x00, 0x00, 0x00, 0x00, 0x1d, 0xc1, 0x0a, 0x80,
+ 0x00, 0x00, 0x00, 0x00, 0x1e, 0x79, 0x9c, 0x80, 0x00, 0x00, 0x00, 0x00,
+ 0x1f, 0x97, 0xb2, 0x00, 0x00, 0x00, 0x00, 0x00, 0x20, 0x59, 0x7e, 0x80,
+ 0x00, 0x00, 0x00, 0x00, 0x21, 0x80, 0xce, 0x80, 0x00, 0x00, 0x00, 0x00,
+ 0x22, 0x42, 0x9b, 0x00, 0x00, 0x00, 0x00, 0x00, 0x23, 0x69, 0xeb, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x24, 0x22, 0x7d, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x25, 0x49, 0xcd, 0x00, 0x00, 0x00, 0x00, 0x00, 0x25, 0xef, 0xea, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x27, 0x29, 0xaf, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x27, 0xcf, 0xcc, 0x00, 0x00, 0x00, 0x00, 0x00, 0x29, 0x09, 0x91, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x29, 0xaf, 0xae, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x2a, 0xe9, 0x73, 0x00, 0x00, 0x00, 0x00, 0x00, 0x2b, 0x98, 0xca, 0x80,
+ 0x00, 0x00, 0x00, 0x00, 0x2c, 0xd2, 0x8f, 0x80, 0x00, 0x00, 0x00, 0x00,
+ 0x2d, 0x78, 0xac, 0x80, 0x00, 0x00, 0x00, 0x00, 0x2e, 0xb2, 0x71, 0x80,
+ 0x00, 0x00, 0x00, 0x00, 0x2f, 0x58, 0x8e, 0x80, 0x00, 0x00, 0x00, 0x00,
+ 0x30, 0x92, 0x53, 0x80, 0x00, 0x00, 0x00, 0x00, 0x31, 0x5d, 0x5a, 0x80,
+ 0x00, 0x00, 0x00, 0x00, 0x32, 0x72, 0x35, 0x80, 0x00, 0x00, 0x00, 0x00,
+ 0x33, 0x3d, 0x3c, 0x80, 0x00, 0x00, 0x00, 0x00, 0x34, 0x52, 0x17, 0x80,
+ 0x00, 0x00, 0x00, 0x00, 0x35, 0x1d, 0x1e, 0x80, 0x00, 0x00, 0x00, 0x00,
+ 0x36, 0x31, 0xf9, 0x80, 0x00, 0x00, 0x00, 0x00, 0x36, 0xfd, 0x00, 0x80,
+ 0x00, 0x00, 0x00, 0x00, 0x38, 0x1b, 0x16, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x38, 0xdc, 0xe2, 0x80, 0x00, 0x00, 0x00, 0x00, 0x39, 0xa7, 0xe9, 0x80,
+ 0x00, 0x00, 0x00, 0x00, 0x3a, 0xbc, 0xc4, 0x80, 0x00, 0x00, 0x00, 0x00,
+ 0x3b, 0xda, 0xda, 0x00, 0x00, 0x00, 0x00, 0x00, 0x3c, 0xa5, 0xe1, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x3d, 0xba, 0xbc, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x3e, 0x85, 0xc3, 0x00, 0x00, 0x00, 0x00, 0x00, 0x3f, 0x9a, 0x9e, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x40, 0x65, 0xa5, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x41, 0x83, 0xba, 0x80, 0x00, 0x00, 0x00, 0x00, 0x42, 0x45, 0x87, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x43, 0x63, 0x9c, 0x80, 0x00, 0x00, 0x00, 0x00,
+ 0x44, 0x2e, 0xa3, 0x80, 0x00, 0x00, 0x00, 0x00, 0x45, 0x43, 0x7e, 0x80,
+ 0x00, 0x00, 0x00, 0x00, 0x46, 0x05, 0x4b, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x47, 0x23, 0x60, 0x80, 0x00, 0x00, 0x00, 0x00, 0x47, 0xf7, 0xa2, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x48, 0xe7, 0x93, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x49, 0xd7, 0x84, 0x00, 0x00, 0x00, 0x00, 0x00, 0x4a, 0xc7, 0x75, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x4b, 0xb7, 0x66, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x4c, 0xa7, 0x57, 0x00, 0x00, 0x00, 0x00, 0x00, 0x4d, 0x97, 0x48, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x4e, 0x87, 0x39, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x4f, 0x77, 0x2a, 0x00, 0x00, 0x00, 0x00, 0x00, 0x50, 0x70, 0x55, 0x80,
+ 0x00, 0x00, 0x00, 0x00, 0x51, 0x60, 0x46, 0x80, 0x00, 0x00, 0x00, 0x00,
+ 0x52, 0x50, 0x37, 0x80, 0x00, 0x00, 0x00, 0x00, 0x53, 0x40, 0x28, 0x80,
+ 0x00, 0x00, 0x00, 0x00, 0x54, 0x30, 0x19, 0x80, 0x00, 0x00, 0x00, 0x00,
+ 0x55, 0x20, 0x0a, 0x80, 0x00, 0x00, 0x00, 0x00, 0x56, 0x0f, 0xfb, 0x80,
+ 0x00, 0x00, 0x00, 0x00, 0x56, 0xff, 0xec, 0x80, 0x00, 0x00, 0x00, 0x00,
+ 0x57, 0xef, 0xdd, 0x80, 0x00, 0x00, 0x00, 0x00, 0x58, 0xdf, 0xce, 0x80,
+ 0x00, 0x00, 0x00, 0x00, 0x59, 0xcf, 0xbf, 0x80, 0x00, 0x00, 0x00, 0x00,
+ 0x5a, 0xbf, 0xb0, 0x80, 0x00, 0x00, 0x00, 0x00, 0x5b, 0xb8, 0xdc, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x5c, 0xa8, 0xcd, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x5d, 0x98, 0xbe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x5e, 0x88, 0xaf, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x5f, 0x78, 0xa0, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x60, 0x68, 0x91, 0x00, 0x00, 0x00, 0x00, 0x00, 0x61, 0x58, 0x82, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x62, 0x48, 0x73, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x63, 0x38, 0x64, 0x00, 0x00, 0x00, 0x00, 0x00, 0x64, 0x28, 0x55, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x65, 0x18, 0x46, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x66, 0x11, 0x71, 0x80, 0x00, 0x00, 0x00, 0x00, 0x67, 0x01, 0x62, 0x80,
+ 0x00, 0x00, 0x00, 0x00, 0x67, 0xf1, 0x53, 0x80, 0x00, 0x00, 0x00, 0x00,
+ 0x68, 0xe1, 0x44, 0x80, 0x00, 0x00, 0x00, 0x00, 0x69, 0xd1, 0x35, 0x80,
+ 0x00, 0x00, 0x00, 0x00, 0x6a, 0xc1, 0x26, 0x80, 0x00, 0x00, 0x00, 0x00,
+ 0x6b, 0xb1, 0x17, 0x80, 0x00, 0x00, 0x00, 0x00, 0x6c, 0xa1, 0x08, 0x80,
+ 0x00, 0x00, 0x00, 0x00, 0x6d, 0x90, 0xf9, 0x80, 0x00, 0x00, 0x00, 0x00,
+ 0x6e, 0x80, 0xea, 0x80, 0x00, 0x00, 0x00, 0x00, 0x6f, 0x70, 0xdb, 0x80,
+ 0x00, 0x00, 0x00, 0x00, 0x70, 0x6a, 0x07, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x71, 0x59, 0xf8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x72, 0x49, 0xe9, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x73, 0x39, 0xda, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x74, 0x29, 0xcb, 0x00, 0x00, 0x00, 0x00, 0x00, 0x75, 0x19, 0xbc, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x76, 0x09, 0xad, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x76, 0xf9, 0x9e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x77, 0xe9, 0x8f, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x78, 0xd9, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x79, 0xc9, 0x71, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7a, 0xb9, 0x62, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x7b, 0xb2, 0x8d, 0x80, 0x00, 0x00, 0x00, 0x00,
+ 0x7c, 0xa2, 0x7e, 0x80, 0x00, 0x00, 0x00, 0x00, 0x7d, 0x92, 0x6f, 0x80,
+ 0x00, 0x00, 0x00, 0x00, 0x7e, 0x82, 0x60, 0x80, 0x00, 0x00, 0x00, 0x00,
+ 0x7f, 0x72, 0x51, 0x80, 0x00, 0x02, 0x01, 0x02, 0x01, 0x02, 0x01, 0x02,
+ 0x01, 0x02, 0x03, 0x04, 0x03, 0x04, 0x03, 0x04, 0x03, 0x04, 0x03, 0x04,
+ 0x03, 0x04, 0x03, 0x04, 0x03, 0x04, 0x03, 0x04, 0x03, 0x04, 0x03, 0x04,
+ 0x03, 0x04, 0x03, 0x04, 0x03, 0x04, 0x03, 0x04, 0x03, 0x04, 0x03, 0x04,
+ 0x03, 0x04, 0x03, 0x04, 0x03, 0x04, 0x03, 0x04, 0x03, 0x04, 0x03, 0x04,
+ 0x03, 0x04, 0x03, 0x04, 0x03, 0x04, 0x03, 0x04, 0x03, 0x04, 0x03, 0x04,
+ 0x03, 0x04, 0x03, 0x04, 0x03, 0x04, 0x03, 0x04, 0x03, 0x04, 0x03, 0x04,
+ 0x03, 0x04, 0x03, 0x04, 0x03, 0x04, 0x03, 0x04, 0x03, 0x04, 0x03, 0x04,
+ 0x03, 0x04, 0x03, 0x04, 0x03, 0x04, 0x03, 0x04, 0x03, 0x04, 0x03, 0x04,
+ 0x03, 0x04, 0x03, 0x04, 0x03, 0x04, 0x03, 0x04, 0x03, 0x04, 0x03, 0x04,
+ 0x03, 0x04, 0x03, 0x04, 0x03, 0x04, 0x03, 0x04, 0x03, 0x04, 0x03, 0x04,
+ 0x03, 0x04, 0x03, 0x04, 0x03, 0x04, 0x03, 0x04, 0x03, 0x04, 0x03, 0x04,
+ 0x03, 0x04, 0x03, 0x00, 0x00, 0x8d, 0xc4, 0x00, 0x00, 0x00, 0x00, 0x9a,
+ 0xb0, 0x01, 0x04, 0x00, 0x00, 0x8c, 0xa0, 0x00, 0x09, 0x00, 0x00, 0x9a,
+ 0xb0, 0x01, 0x04, 0x00, 0x00, 0x8c, 0xa0, 0x00, 0x09, 0x4c, 0x4d, 0x54,
+ 0x00, 0x41, 0x45, 0x44, 0x54, 0x00, 0x41, 0x45, 0x53, 0x54, 0x00, 0x00,
+ 0x00, 0x00, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0a, 0x41, 0x45,
+ 0x53, 0x54, 0x2d, 0x31, 0x30, 0x41, 0x45, 0x44, 0x54, 0x2c, 0x4d, 0x31,
+ 0x30, 0x2e, 0x31, 0x2e, 0x30, 0x2c, 0x4d, 0x34, 0x2e, 0x31, 0x2e, 0x30,
+ 0x2f, 0x33, 0x0a
+};
+unsigned int Australia_Sydney_len = 2223;
diff --git a/third_party/abseil/src/absl/time/time.cc b/third_party/abseil/src/absl/time/time.cc
new file mode 100644
index 0000000..1ec2026
--- /dev/null
+++ b/third_party/abseil/src/absl/time/time.cc
@@ -0,0 +1,500 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// The implementation of the absl::Time class, which is declared in
+// //absl/time.h.
+//
+// The representation for an absl::Time is an absl::Duration offset from the
+// epoch. We use the traditional Unix epoch (1970-01-01 00:00:00 +0000)
+// for convenience, but this is not exposed in the API and could be changed.
+//
+// NOTE: To keep type verbosity to a minimum, the following variable naming
+// conventions are used throughout this file.
+//
+// tz: An absl::TimeZone
+// ci: An absl::TimeZone::CivilInfo
+// ti: An absl::TimeZone::TimeInfo
+// cd: An absl::CivilDay or a cctz::civil_day
+// cs: An absl::CivilSecond or a cctz::civil_second
+// bd: An absl::Time::Breakdown
+// cl: A cctz::time_zone::civil_lookup
+// al: A cctz::time_zone::absolute_lookup
+
+#include "absl/time/time.h"
+
+#if defined(_MSC_VER)
+#include <winsock2.h> // for timeval
+#endif
+
+#include <cstring>
+#include <ctime>
+#include <limits>
+
+#include "absl/time/internal/cctz/include/cctz/civil_time.h"
+#include "absl/time/internal/cctz/include/cctz/time_zone.h"
+
+namespace cctz = absl::time_internal::cctz;
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+namespace {
+
+inline cctz::time_point<cctz::seconds> unix_epoch() {
+ return std::chrono::time_point_cast<cctz::seconds>(
+ std::chrono::system_clock::from_time_t(0));
+}
+
+// Floors d to the next unit boundary closer to negative infinity.
+inline int64_t FloorToUnit(absl::Duration d, absl::Duration unit) {
+ absl::Duration rem;
+ int64_t q = absl::IDivDuration(d, unit, &rem);
+ return (q > 0 || rem >= ZeroDuration() ||
+ q == std::numeric_limits<int64_t>::min())
+ ? q
+ : q - 1;
+}
+
+inline absl::Time::Breakdown InfiniteFutureBreakdown() {
+ absl::Time::Breakdown bd;
+ bd.year = std::numeric_limits<int64_t>::max();
+ bd.month = 12;
+ bd.day = 31;
+ bd.hour = 23;
+ bd.minute = 59;
+ bd.second = 59;
+ bd.subsecond = absl::InfiniteDuration();
+ bd.weekday = 4;
+ bd.yearday = 365;
+ bd.offset = 0;
+ bd.is_dst = false;
+ bd.zone_abbr = "-00";
+ return bd;
+}
+
+inline absl::Time::Breakdown InfinitePastBreakdown() {
+ Time::Breakdown bd;
+ bd.year = std::numeric_limits<int64_t>::min();
+ bd.month = 1;
+ bd.day = 1;
+ bd.hour = 0;
+ bd.minute = 0;
+ bd.second = 0;
+ bd.subsecond = -absl::InfiniteDuration();
+ bd.weekday = 7;
+ bd.yearday = 1;
+ bd.offset = 0;
+ bd.is_dst = false;
+ bd.zone_abbr = "-00";
+ return bd;
+}
+
+inline absl::TimeZone::CivilInfo InfiniteFutureCivilInfo() {
+ TimeZone::CivilInfo ci;
+ ci.cs = CivilSecond::max();
+ ci.subsecond = InfiniteDuration();
+ ci.offset = 0;
+ ci.is_dst = false;
+ ci.zone_abbr = "-00";
+ return ci;
+}
+
+inline absl::TimeZone::CivilInfo InfinitePastCivilInfo() {
+ TimeZone::CivilInfo ci;
+ ci.cs = CivilSecond::min();
+ ci.subsecond = -InfiniteDuration();
+ ci.offset = 0;
+ ci.is_dst = false;
+ ci.zone_abbr = "-00";
+ return ci;
+}
+
+inline absl::TimeConversion InfiniteFutureTimeConversion() {
+ absl::TimeConversion tc;
+ tc.pre = tc.trans = tc.post = absl::InfiniteFuture();
+ tc.kind = absl::TimeConversion::UNIQUE;
+ tc.normalized = true;
+ return tc;
+}
+
+inline TimeConversion InfinitePastTimeConversion() {
+ absl::TimeConversion tc;
+ tc.pre = tc.trans = tc.post = absl::InfinitePast();
+ tc.kind = absl::TimeConversion::UNIQUE;
+ tc.normalized = true;
+ return tc;
+}
+
+// Makes a Time from sec, overflowing to InfiniteFuture/InfinitePast as
+// necessary. If sec is min/max, then consult cs+tz to check for overlow.
+Time MakeTimeWithOverflow(const cctz::time_point<cctz::seconds>& sec,
+ const cctz::civil_second& cs,
+ const cctz::time_zone& tz,
+ bool* normalized = nullptr) {
+ const auto max = cctz::time_point<cctz::seconds>::max();
+ const auto min = cctz::time_point<cctz::seconds>::min();
+ if (sec == max) {
+ const auto al = tz.lookup(max);
+ if (cs > al.cs) {
+ if (normalized) *normalized = true;
+ return absl::InfiniteFuture();
+ }
+ }
+ if (sec == min) {
+ const auto al = tz.lookup(min);
+ if (cs < al.cs) {
+ if (normalized) *normalized = true;
+ return absl::InfinitePast();
+ }
+ }
+ const auto hi = (sec - unix_epoch()).count();
+ return time_internal::FromUnixDuration(time_internal::MakeDuration(hi));
+}
+
+// Returns Mon=1..Sun=7.
+inline int MapWeekday(const cctz::weekday& wd) {
+ switch (wd) {
+ case cctz::weekday::monday:
+ return 1;
+ case cctz::weekday::tuesday:
+ return 2;
+ case cctz::weekday::wednesday:
+ return 3;
+ case cctz::weekday::thursday:
+ return 4;
+ case cctz::weekday::friday:
+ return 5;
+ case cctz::weekday::saturday:
+ return 6;
+ case cctz::weekday::sunday:
+ return 7;
+ }
+ return 1;
+}
+
+bool FindTransition(const cctz::time_zone& tz,
+ bool (cctz::time_zone::*find_transition)(
+ const cctz::time_point<cctz::seconds>& tp,
+ cctz::time_zone::civil_transition* trans) const,
+ Time t, TimeZone::CivilTransition* trans) {
+ // Transitions are second-aligned, so we can discard any fractional part.
+ const auto tp = unix_epoch() + cctz::seconds(ToUnixSeconds(t));
+ cctz::time_zone::civil_transition tr;
+ if (!(tz.*find_transition)(tp, &tr)) return false;
+ trans->from = CivilSecond(tr.from);
+ trans->to = CivilSecond(tr.to);
+ return true;
+}
+
+} // namespace
+
+//
+// Time
+//
+
+absl::Time::Breakdown Time::In(absl::TimeZone tz) const {
+ if (*this == absl::InfiniteFuture()) return InfiniteFutureBreakdown();
+ if (*this == absl::InfinitePast()) return InfinitePastBreakdown();
+
+ const auto tp = unix_epoch() + cctz::seconds(time_internal::GetRepHi(rep_));
+ const auto al = cctz::time_zone(tz).lookup(tp);
+ const auto cs = al.cs;
+ const auto cd = cctz::civil_day(cs);
+
+ absl::Time::Breakdown bd;
+ bd.year = cs.year();
+ bd.month = cs.month();
+ bd.day = cs.day();
+ bd.hour = cs.hour();
+ bd.minute = cs.minute();
+ bd.second = cs.second();
+ bd.subsecond = time_internal::MakeDuration(0, time_internal::GetRepLo(rep_));
+ bd.weekday = MapWeekday(cctz::get_weekday(cd));
+ bd.yearday = cctz::get_yearday(cd);
+ bd.offset = al.offset;
+ bd.is_dst = al.is_dst;
+ bd.zone_abbr = al.abbr;
+ return bd;
+}
+
+//
+// Conversions from/to other time types.
+//
+
+absl::Time FromUDate(double udate) {
+ return time_internal::FromUnixDuration(absl::Milliseconds(udate));
+}
+
+absl::Time FromUniversal(int64_t universal) {
+ return absl::UniversalEpoch() + 100 * absl::Nanoseconds(universal);
+}
+
+int64_t ToUnixNanos(Time t) {
+ if (time_internal::GetRepHi(time_internal::ToUnixDuration(t)) >= 0 &&
+ time_internal::GetRepHi(time_internal::ToUnixDuration(t)) >> 33 == 0) {
+ return (time_internal::GetRepHi(time_internal::ToUnixDuration(t)) *
+ 1000 * 1000 * 1000) +
+ (time_internal::GetRepLo(time_internal::ToUnixDuration(t)) / 4);
+ }
+ return FloorToUnit(time_internal::ToUnixDuration(t), absl::Nanoseconds(1));
+}
+
+int64_t ToUnixMicros(Time t) {
+ if (time_internal::GetRepHi(time_internal::ToUnixDuration(t)) >= 0 &&
+ time_internal::GetRepHi(time_internal::ToUnixDuration(t)) >> 43 == 0) {
+ return (time_internal::GetRepHi(time_internal::ToUnixDuration(t)) *
+ 1000 * 1000) +
+ (time_internal::GetRepLo(time_internal::ToUnixDuration(t)) / 4000);
+ }
+ return FloorToUnit(time_internal::ToUnixDuration(t), absl::Microseconds(1));
+}
+
+int64_t ToUnixMillis(Time t) {
+ if (time_internal::GetRepHi(time_internal::ToUnixDuration(t)) >= 0 &&
+ time_internal::GetRepHi(time_internal::ToUnixDuration(t)) >> 53 == 0) {
+ return (time_internal::GetRepHi(time_internal::ToUnixDuration(t)) * 1000) +
+ (time_internal::GetRepLo(time_internal::ToUnixDuration(t)) /
+ (4000 * 1000));
+ }
+ return FloorToUnit(time_internal::ToUnixDuration(t), absl::Milliseconds(1));
+}
+
+int64_t ToUnixSeconds(Time t) {
+ return time_internal::GetRepHi(time_internal::ToUnixDuration(t));
+}
+
+time_t ToTimeT(Time t) { return absl::ToTimespec(t).tv_sec; }
+
+double ToUDate(Time t) {
+ return absl::FDivDuration(time_internal::ToUnixDuration(t),
+ absl::Milliseconds(1));
+}
+
+int64_t ToUniversal(absl::Time t) {
+ return absl::FloorToUnit(t - absl::UniversalEpoch(), absl::Nanoseconds(100));
+}
+
+absl::Time TimeFromTimespec(timespec ts) {
+ return time_internal::FromUnixDuration(absl::DurationFromTimespec(ts));
+}
+
+absl::Time TimeFromTimeval(timeval tv) {
+ return time_internal::FromUnixDuration(absl::DurationFromTimeval(tv));
+}
+
+timespec ToTimespec(Time t) {
+ timespec ts;
+ absl::Duration d = time_internal::ToUnixDuration(t);
+ if (!time_internal::IsInfiniteDuration(d)) {
+ ts.tv_sec = time_internal::GetRepHi(d);
+ if (ts.tv_sec == time_internal::GetRepHi(d)) { // no time_t narrowing
+ ts.tv_nsec = time_internal::GetRepLo(d) / 4; // floor
+ return ts;
+ }
+ }
+ if (d >= absl::ZeroDuration()) {
+ ts.tv_sec = std::numeric_limits<time_t>::max();
+ ts.tv_nsec = 1000 * 1000 * 1000 - 1;
+ } else {
+ ts.tv_sec = std::numeric_limits<time_t>::min();
+ ts.tv_nsec = 0;
+ }
+ return ts;
+}
+
+timeval ToTimeval(Time t) {
+ timeval tv;
+ timespec ts = absl::ToTimespec(t);
+ tv.tv_sec = ts.tv_sec;
+ if (tv.tv_sec != ts.tv_sec) { // narrowing
+ if (ts.tv_sec < 0) {
+ tv.tv_sec = std::numeric_limits<decltype(tv.tv_sec)>::min();
+ tv.tv_usec = 0;
+ } else {
+ tv.tv_sec = std::numeric_limits<decltype(tv.tv_sec)>::max();
+ tv.tv_usec = 1000 * 1000 - 1;
+ }
+ return tv;
+ }
+ tv.tv_usec = static_cast<int>(ts.tv_nsec / 1000); // suseconds_t
+ return tv;
+}
+
+Time FromChrono(const std::chrono::system_clock::time_point& tp) {
+ return time_internal::FromUnixDuration(time_internal::FromChrono(
+ tp - std::chrono::system_clock::from_time_t(0)));
+}
+
+std::chrono::system_clock::time_point ToChronoTime(absl::Time t) {
+ using D = std::chrono::system_clock::duration;
+ auto d = time_internal::ToUnixDuration(t);
+ if (d < ZeroDuration()) d = Floor(d, FromChrono(D{1}));
+ return std::chrono::system_clock::from_time_t(0) +
+ time_internal::ToChronoDuration<D>(d);
+}
+
+//
+// TimeZone
+//
+
+absl::TimeZone::CivilInfo TimeZone::At(Time t) const {
+ if (t == absl::InfiniteFuture()) return InfiniteFutureCivilInfo();
+ if (t == absl::InfinitePast()) return InfinitePastCivilInfo();
+
+ const auto ud = time_internal::ToUnixDuration(t);
+ const auto tp = unix_epoch() + cctz::seconds(time_internal::GetRepHi(ud));
+ const auto al = cz_.lookup(tp);
+
+ TimeZone::CivilInfo ci;
+ ci.cs = CivilSecond(al.cs);
+ ci.subsecond = time_internal::MakeDuration(0, time_internal::GetRepLo(ud));
+ ci.offset = al.offset;
+ ci.is_dst = al.is_dst;
+ ci.zone_abbr = al.abbr;
+ return ci;
+}
+
+absl::TimeZone::TimeInfo TimeZone::At(CivilSecond ct) const {
+ const cctz::civil_second cs(ct);
+ const auto cl = cz_.lookup(cs);
+
+ TimeZone::TimeInfo ti;
+ switch (cl.kind) {
+ case cctz::time_zone::civil_lookup::UNIQUE:
+ ti.kind = TimeZone::TimeInfo::UNIQUE;
+ break;
+ case cctz::time_zone::civil_lookup::SKIPPED:
+ ti.kind = TimeZone::TimeInfo::SKIPPED;
+ break;
+ case cctz::time_zone::civil_lookup::REPEATED:
+ ti.kind = TimeZone::TimeInfo::REPEATED;
+ break;
+ }
+ ti.pre = MakeTimeWithOverflow(cl.pre, cs, cz_);
+ ti.trans = MakeTimeWithOverflow(cl.trans, cs, cz_);
+ ti.post = MakeTimeWithOverflow(cl.post, cs, cz_);
+ return ti;
+}
+
+bool TimeZone::NextTransition(Time t, CivilTransition* trans) const {
+ return FindTransition(cz_, &cctz::time_zone::next_transition, t, trans);
+}
+
+bool TimeZone::PrevTransition(Time t, CivilTransition* trans) const {
+ return FindTransition(cz_, &cctz::time_zone::prev_transition, t, trans);
+}
+
+//
+// Conversions involving time zones.
+//
+
+absl::TimeConversion ConvertDateTime(int64_t year, int mon, int day, int hour,
+ int min, int sec, TimeZone tz) {
+ // Avoids years that are too extreme for CivilSecond to normalize.
+ if (year > 300000000000) return InfiniteFutureTimeConversion();
+ if (year < -300000000000) return InfinitePastTimeConversion();
+
+ const CivilSecond cs(year, mon, day, hour, min, sec);
+ const auto ti = tz.At(cs);
+
+ TimeConversion tc;
+ tc.pre = ti.pre;
+ tc.trans = ti.trans;
+ tc.post = ti.post;
+ switch (ti.kind) {
+ case TimeZone::TimeInfo::UNIQUE:
+ tc.kind = TimeConversion::UNIQUE;
+ break;
+ case TimeZone::TimeInfo::SKIPPED:
+ tc.kind = TimeConversion::SKIPPED;
+ break;
+ case TimeZone::TimeInfo::REPEATED:
+ tc.kind = TimeConversion::REPEATED;
+ break;
+ }
+ tc.normalized = false;
+ if (year != cs.year() || mon != cs.month() || day != cs.day() ||
+ hour != cs.hour() || min != cs.minute() || sec != cs.second()) {
+ tc.normalized = true;
+ }
+ return tc;
+}
+
+absl::Time FromTM(const struct tm& tm, absl::TimeZone tz) {
+ civil_year_t tm_year = tm.tm_year;
+ // Avoids years that are too extreme for CivilSecond to normalize.
+ if (tm_year > 300000000000ll) return InfiniteFuture();
+ if (tm_year < -300000000000ll) return InfinitePast();
+ int tm_mon = tm.tm_mon;
+ if (tm_mon == std::numeric_limits<int>::max()) {
+ tm_mon -= 12;
+ tm_year += 1;
+ }
+ const auto ti = tz.At(CivilSecond(tm_year + 1900, tm_mon + 1, tm.tm_mday,
+ tm.tm_hour, tm.tm_min, tm.tm_sec));
+ return tm.tm_isdst == 0 ? ti.post : ti.pre;
+}
+
+struct tm ToTM(absl::Time t, absl::TimeZone tz) {
+ struct tm tm = {};
+
+ const auto ci = tz.At(t);
+ const auto& cs = ci.cs;
+ tm.tm_sec = cs.second();
+ tm.tm_min = cs.minute();
+ tm.tm_hour = cs.hour();
+ tm.tm_mday = cs.day();
+ tm.tm_mon = cs.month() - 1;
+
+ // Saturates tm.tm_year in cases of over/underflow, accounting for the fact
+ // that tm.tm_year is years since 1900.
+ if (cs.year() < std::numeric_limits<int>::min() + 1900) {
+ tm.tm_year = std::numeric_limits<int>::min();
+ } else if (cs.year() > std::numeric_limits<int>::max()) {
+ tm.tm_year = std::numeric_limits<int>::max() - 1900;
+ } else {
+ tm.tm_year = static_cast<int>(cs.year() - 1900);
+ }
+
+ switch (GetWeekday(cs)) {
+ case Weekday::sunday:
+ tm.tm_wday = 0;
+ break;
+ case Weekday::monday:
+ tm.tm_wday = 1;
+ break;
+ case Weekday::tuesday:
+ tm.tm_wday = 2;
+ break;
+ case Weekday::wednesday:
+ tm.tm_wday = 3;
+ break;
+ case Weekday::thursday:
+ tm.tm_wday = 4;
+ break;
+ case Weekday::friday:
+ tm.tm_wday = 5;
+ break;
+ case Weekday::saturday:
+ tm.tm_wday = 6;
+ break;
+ }
+ tm.tm_yday = GetYearDay(cs) - 1;
+ tm.tm_isdst = ci.is_dst ? 1 : 0;
+
+ return tm;
+}
+
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/time/time.h b/third_party/abseil/src/absl/time/time.h
new file mode 100644
index 0000000..7250803
--- /dev/null
+++ b/third_party/abseil/src/absl/time/time.h
@@ -0,0 +1,1581 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: time.h
+// -----------------------------------------------------------------------------
+//
+// This header file defines abstractions for computing with absolute points
+// in time, durations of time, and formatting and parsing time within a given
+// time zone. The following abstractions are defined:
+//
+// * `absl::Time` defines an absolute, specific instance in time
+// * `absl::Duration` defines a signed, fixed-length span of time
+// * `absl::TimeZone` defines geopolitical time zone regions (as collected
+// within the IANA Time Zone database (https://www.iana.org/time-zones)).
+//
+// Note: Absolute times are distinct from civil times, which refer to the
+// human-scale time commonly represented by `YYYY-MM-DD hh:mm:ss`. The mapping
+// between absolute and civil times can be specified by use of time zones
+// (`absl::TimeZone` within this API). That is:
+//
+// Civil Time = F(Absolute Time, Time Zone)
+// Absolute Time = G(Civil Time, Time Zone)
+//
+// See civil_time.h for abstractions related to constructing and manipulating
+// civil time.
+//
+// Example:
+//
+// absl::TimeZone nyc;
+// // LoadTimeZone() may fail so it's always better to check for success.
+// if (!absl::LoadTimeZone("America/New_York", &nyc)) {
+// // handle error case
+// }
+//
+// // My flight leaves NYC on Jan 2, 2017 at 03:04:05
+// absl::CivilSecond cs(2017, 1, 2, 3, 4, 5);
+// absl::Time takeoff = absl::FromCivil(cs, nyc);
+//
+// absl::Duration flight_duration = absl::Hours(21) + absl::Minutes(35);
+// absl::Time landing = takeoff + flight_duration;
+//
+// absl::TimeZone syd;
+// if (!absl::LoadTimeZone("Australia/Sydney", &syd)) {
+// // handle error case
+// }
+// std::string s = absl::FormatTime(
+// "My flight will land in Sydney on %Y-%m-%d at %H:%M:%S",
+// landing, syd);
+
+#ifndef ABSL_TIME_TIME_H_
+#define ABSL_TIME_TIME_H_
+
+#if !defined(_MSC_VER)
+#include <sys/time.h>
+#else
+// We don't include `winsock2.h` because it drags in `windows.h` and friends,
+// and they define conflicting macros like OPAQUE, ERROR, and more. This has the
+// potential to break Abseil users.
+//
+// Instead we only forward declare `timeval` and require Windows users include
+// `winsock2.h` themselves. This is both inconsistent and troublesome, but so is
+// including 'windows.h' so we are picking the lesser of two evils here.
+struct timeval;
+#endif
+#include <chrono> // NOLINT(build/c++11)
+#include <cmath>
+#include <cstdint>
+#include <ctime>
+#include <ostream>
+#include <string>
+#include <type_traits>
+#include <utility>
+
+#include "absl/base/macros.h"
+#include "absl/strings/string_view.h"
+#include "absl/time/civil_time.h"
+#include "absl/time/internal/cctz/include/cctz/time_zone.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+class Duration; // Defined below
+class Time; // Defined below
+class TimeZone; // Defined below
+
+namespace time_internal {
+int64_t IDivDuration(bool satq, Duration num, Duration den, Duration* rem);
+constexpr Time FromUnixDuration(Duration d);
+constexpr Duration ToUnixDuration(Time t);
+constexpr int64_t GetRepHi(Duration d);
+constexpr uint32_t GetRepLo(Duration d);
+constexpr Duration MakeDuration(int64_t hi, uint32_t lo);
+constexpr Duration MakeDuration(int64_t hi, int64_t lo);
+inline Duration MakePosDoubleDuration(double n);
+constexpr int64_t kTicksPerNanosecond = 4;
+constexpr int64_t kTicksPerSecond = 1000 * 1000 * 1000 * kTicksPerNanosecond;
+template <std::intmax_t N>
+constexpr Duration FromInt64(int64_t v, std::ratio<1, N>);
+constexpr Duration FromInt64(int64_t v, std::ratio<60>);
+constexpr Duration FromInt64(int64_t v, std::ratio<3600>);
+template <typename T>
+using EnableIfIntegral = typename std::enable_if<
+ std::is_integral<T>::value || std::is_enum<T>::value, int>::type;
+template <typename T>
+using EnableIfFloat =
+ typename std::enable_if<std::is_floating_point<T>::value, int>::type;
+} // namespace time_internal
+
+// Duration
+//
+// The `absl::Duration` class represents a signed, fixed-length span of time.
+// A `Duration` is generated using a unit-specific factory function, or is
+// the result of subtracting one `absl::Time` from another. Durations behave
+// like unit-safe integers and they support all the natural integer-like
+// arithmetic operations. Arithmetic overflows and saturates at +/- infinity.
+// `Duration` should be passed by value rather than const reference.
+//
+// Factory functions `Nanoseconds()`, `Microseconds()`, `Milliseconds()`,
+// `Seconds()`, `Minutes()`, `Hours()` and `InfiniteDuration()` allow for
+// creation of constexpr `Duration` values
+//
+// Examples:
+//
+// constexpr absl::Duration ten_ns = absl::Nanoseconds(10);
+// constexpr absl::Duration min = absl::Minutes(1);
+// constexpr absl::Duration hour = absl::Hours(1);
+// absl::Duration dur = 60 * min; // dur == hour
+// absl::Duration half_sec = absl::Milliseconds(500);
+// absl::Duration quarter_sec = 0.25 * absl::Seconds(1);
+//
+// `Duration` values can be easily converted to an integral number of units
+// using the division operator.
+//
+// Example:
+//
+// constexpr absl::Duration dur = absl::Milliseconds(1500);
+// int64_t ns = dur / absl::Nanoseconds(1); // ns == 1500000000
+// int64_t ms = dur / absl::Milliseconds(1); // ms == 1500
+// int64_t sec = dur / absl::Seconds(1); // sec == 1 (subseconds truncated)
+// int64_t min = dur / absl::Minutes(1); // min == 0
+//
+// See the `IDivDuration()` and `FDivDuration()` functions below for details on
+// how to access the fractional parts of the quotient.
+//
+// Alternatively, conversions can be performed using helpers such as
+// `ToInt64Microseconds()` and `ToDoubleSeconds()`.
+class Duration {
+ public:
+ // Value semantics.
+ constexpr Duration() : rep_hi_(0), rep_lo_(0) {} // zero-length duration
+
+ // Copyable.
+#if !defined(__clang__) && defined(_MSC_VER) && _MSC_VER < 1910
+ // Explicitly defining the constexpr copy constructor avoids an MSVC bug.
+ constexpr Duration(const Duration& d)
+ : rep_hi_(d.rep_hi_), rep_lo_(d.rep_lo_) {}
+#else
+ constexpr Duration(const Duration& d) = default;
+#endif
+ Duration& operator=(const Duration& d) = default;
+
+ // Compound assignment operators.
+ Duration& operator+=(Duration d);
+ Duration& operator-=(Duration d);
+ Duration& operator*=(int64_t r);
+ Duration& operator*=(double r);
+ Duration& operator/=(int64_t r);
+ Duration& operator/=(double r);
+ Duration& operator%=(Duration rhs);
+
+ // Overloads that forward to either the int64_t or double overloads above.
+ // Integer operands must be representable as int64_t.
+ template <typename T>
+ Duration& operator*=(T r) {
+ int64_t x = r;
+ return *this *= x;
+ }
+ template <typename T>
+ Duration& operator/=(T r) {
+ int64_t x = r;
+ return *this /= x;
+ }
+ Duration& operator*=(float r) { return *this *= static_cast<double>(r); }
+ Duration& operator/=(float r) { return *this /= static_cast<double>(r); }
+
+ template <typename H>
+ friend H AbslHashValue(H h, Duration d) {
+ return H::combine(std::move(h), d.rep_hi_, d.rep_lo_);
+ }
+
+ private:
+ friend constexpr int64_t time_internal::GetRepHi(Duration d);
+ friend constexpr uint32_t time_internal::GetRepLo(Duration d);
+ friend constexpr Duration time_internal::MakeDuration(int64_t hi,
+ uint32_t lo);
+ constexpr Duration(int64_t hi, uint32_t lo) : rep_hi_(hi), rep_lo_(lo) {}
+ int64_t rep_hi_;
+ uint32_t rep_lo_;
+};
+
+// Relational Operators
+constexpr bool operator<(Duration lhs, Duration rhs);
+constexpr bool operator>(Duration lhs, Duration rhs) { return rhs < lhs; }
+constexpr bool operator>=(Duration lhs, Duration rhs) { return !(lhs < rhs); }
+constexpr bool operator<=(Duration lhs, Duration rhs) { return !(rhs < lhs); }
+constexpr bool operator==(Duration lhs, Duration rhs);
+constexpr bool operator!=(Duration lhs, Duration rhs) { return !(lhs == rhs); }
+
+// Additive Operators
+constexpr Duration operator-(Duration d);
+inline Duration operator+(Duration lhs, Duration rhs) { return lhs += rhs; }
+inline Duration operator-(Duration lhs, Duration rhs) { return lhs -= rhs; }
+
+// Multiplicative Operators
+// Integer operands must be representable as int64_t.
+template <typename T>
+Duration operator*(Duration lhs, T rhs) {
+ return lhs *= rhs;
+}
+template <typename T>
+Duration operator*(T lhs, Duration rhs) {
+ return rhs *= lhs;
+}
+template <typename T>
+Duration operator/(Duration lhs, T rhs) {
+ return lhs /= rhs;
+}
+inline int64_t operator/(Duration lhs, Duration rhs) {
+ return time_internal::IDivDuration(true, lhs, rhs,
+ &lhs); // trunc towards zero
+}
+inline Duration operator%(Duration lhs, Duration rhs) { return lhs %= rhs; }
+
+// IDivDuration()
+//
+// Divides a numerator `Duration` by a denominator `Duration`, returning the
+// quotient and remainder. The remainder always has the same sign as the
+// numerator. The returned quotient and remainder respect the identity:
+//
+// numerator = denominator * quotient + remainder
+//
+// Returned quotients are capped to the range of `int64_t`, with the difference
+// spilling into the remainder to uphold the above identity. This means that the
+// remainder returned could differ from the remainder returned by
+// `Duration::operator%` for huge quotients.
+//
+// See also the notes on `InfiniteDuration()` below regarding the behavior of
+// division involving zero and infinite durations.
+//
+// Example:
+//
+// constexpr absl::Duration a =
+// absl::Seconds(std::numeric_limits<int64_t>::max()); // big
+// constexpr absl::Duration b = absl::Nanoseconds(1); // small
+//
+// absl::Duration rem = a % b;
+// // rem == absl::ZeroDuration()
+//
+// // Here, q would overflow int64_t, so rem accounts for the difference.
+// int64_t q = absl::IDivDuration(a, b, &rem);
+// // q == std::numeric_limits<int64_t>::max(), rem == a - b * q
+inline int64_t IDivDuration(Duration num, Duration den, Duration* rem) {
+ return time_internal::IDivDuration(true, num, den,
+ rem); // trunc towards zero
+}
+
+// FDivDuration()
+//
+// Divides a `Duration` numerator into a fractional number of units of a
+// `Duration` denominator.
+//
+// See also the notes on `InfiniteDuration()` below regarding the behavior of
+// division involving zero and infinite durations.
+//
+// Example:
+//
+// double d = absl::FDivDuration(absl::Milliseconds(1500), absl::Seconds(1));
+// // d == 1.5
+double FDivDuration(Duration num, Duration den);
+
+// ZeroDuration()
+//
+// Returns a zero-length duration. This function behaves just like the default
+// constructor, but the name helps make the semantics clear at call sites.
+constexpr Duration ZeroDuration() { return Duration(); }
+
+// AbsDuration()
+//
+// Returns the absolute value of a duration.
+inline Duration AbsDuration(Duration d) {
+ return (d < ZeroDuration()) ? -d : d;
+}
+
+// Trunc()
+//
+// Truncates a duration (toward zero) to a multiple of a non-zero unit.
+//
+// Example:
+//
+// absl::Duration d = absl::Nanoseconds(123456789);
+// absl::Duration a = absl::Trunc(d, absl::Microseconds(1)); // 123456us
+Duration Trunc(Duration d, Duration unit);
+
+// Floor()
+//
+// Floors a duration using the passed duration unit to its largest value not
+// greater than the duration.
+//
+// Example:
+//
+// absl::Duration d = absl::Nanoseconds(123456789);
+// absl::Duration b = absl::Floor(d, absl::Microseconds(1)); // 123456us
+Duration Floor(Duration d, Duration unit);
+
+// Ceil()
+//
+// Returns the ceiling of a duration using the passed duration unit to its
+// smallest value not less than the duration.
+//
+// Example:
+//
+// absl::Duration d = absl::Nanoseconds(123456789);
+// absl::Duration c = absl::Ceil(d, absl::Microseconds(1)); // 123457us
+Duration Ceil(Duration d, Duration unit);
+
+// InfiniteDuration()
+//
+// Returns an infinite `Duration`. To get a `Duration` representing negative
+// infinity, use `-InfiniteDuration()`.
+//
+// Duration arithmetic overflows to +/- infinity and saturates. In general,
+// arithmetic with `Duration` infinities is similar to IEEE 754 infinities
+// except where IEEE 754 NaN would be involved, in which case +/-
+// `InfiniteDuration()` is used in place of a "nan" Duration.
+//
+// Examples:
+//
+// constexpr absl::Duration inf = absl::InfiniteDuration();
+// const absl::Duration d = ... any finite duration ...
+//
+// inf == inf + inf
+// inf == inf + d
+// inf == inf - inf
+// -inf == d - inf
+//
+// inf == d * 1e100
+// inf == inf / 2
+// 0 == d / inf
+// INT64_MAX == inf / d
+//
+// d < inf
+// -inf < d
+//
+// // Division by zero returns infinity, or INT64_MIN/MAX where appropriate.
+// inf == d / 0
+// INT64_MAX == d / absl::ZeroDuration()
+//
+// The examples involving the `/` operator above also apply to `IDivDuration()`
+// and `FDivDuration()`.
+constexpr Duration InfiniteDuration();
+
+// Nanoseconds()
+// Microseconds()
+// Milliseconds()
+// Seconds()
+// Minutes()
+// Hours()
+//
+// Factory functions for constructing `Duration` values from an integral number
+// of the unit indicated by the factory function's name. The number must be
+// representable as int64_t.
+//
+// NOTE: no "Days()" factory function exists because "a day" is ambiguous.
+// Civil days are not always 24 hours long, and a 24-hour duration often does
+// not correspond with a civil day. If a 24-hour duration is needed, use
+// `absl::Hours(24)`. If you actually want a civil day, use absl::CivilDay
+// from civil_time.h.
+//
+// Example:
+//
+// absl::Duration a = absl::Seconds(60);
+// absl::Duration b = absl::Minutes(1); // b == a
+constexpr Duration Nanoseconds(int64_t n);
+constexpr Duration Microseconds(int64_t n);
+constexpr Duration Milliseconds(int64_t n);
+constexpr Duration Seconds(int64_t n);
+constexpr Duration Minutes(int64_t n);
+constexpr Duration Hours(int64_t n);
+
+// Factory overloads for constructing `Duration` values from a floating-point
+// number of the unit indicated by the factory function's name. These functions
+// exist for convenience, but they are not as efficient as the integral
+// factories, which should be preferred.
+//
+// Example:
+//
+// auto a = absl::Seconds(1.5); // OK
+// auto b = absl::Milliseconds(1500); // BETTER
+template <typename T, time_internal::EnableIfFloat<T> = 0>
+Duration Nanoseconds(T n) {
+ return n * Nanoseconds(1);
+}
+template <typename T, time_internal::EnableIfFloat<T> = 0>
+Duration Microseconds(T n) {
+ return n * Microseconds(1);
+}
+template <typename T, time_internal::EnableIfFloat<T> = 0>
+Duration Milliseconds(T n) {
+ return n * Milliseconds(1);
+}
+template <typename T, time_internal::EnableIfFloat<T> = 0>
+Duration Seconds(T n) {
+ if (n >= 0) { // Note: `NaN >= 0` is false.
+ if (n >= static_cast<T>((std::numeric_limits<int64_t>::max)())) {
+ return InfiniteDuration();
+ }
+ return time_internal::MakePosDoubleDuration(n);
+ } else {
+ if (std::isnan(n))
+ return std::signbit(n) ? -InfiniteDuration() : InfiniteDuration();
+ if (n <= (std::numeric_limits<int64_t>::min)()) return -InfiniteDuration();
+ return -time_internal::MakePosDoubleDuration(-n);
+ }
+}
+template <typename T, time_internal::EnableIfFloat<T> = 0>
+Duration Minutes(T n) {
+ return n * Minutes(1);
+}
+template <typename T, time_internal::EnableIfFloat<T> = 0>
+Duration Hours(T n) {
+ return n * Hours(1);
+}
+
+// ToInt64Nanoseconds()
+// ToInt64Microseconds()
+// ToInt64Milliseconds()
+// ToInt64Seconds()
+// ToInt64Minutes()
+// ToInt64Hours()
+//
+// Helper functions that convert a Duration to an integral count of the
+// indicated unit. These functions are shorthand for the `IDivDuration()`
+// function above; see its documentation for details about overflow, etc.
+//
+// Example:
+//
+// absl::Duration d = absl::Milliseconds(1500);
+// int64_t isec = absl::ToInt64Seconds(d); // isec == 1
+int64_t ToInt64Nanoseconds(Duration d);
+int64_t ToInt64Microseconds(Duration d);
+int64_t ToInt64Milliseconds(Duration d);
+int64_t ToInt64Seconds(Duration d);
+int64_t ToInt64Minutes(Duration d);
+int64_t ToInt64Hours(Duration d);
+
+// ToDoubleNanoSeconds()
+// ToDoubleMicroseconds()
+// ToDoubleMilliseconds()
+// ToDoubleSeconds()
+// ToDoubleMinutes()
+// ToDoubleHours()
+//
+// Helper functions that convert a Duration to a floating point count of the
+// indicated unit. These functions are shorthand for the `FDivDuration()`
+// function above; see its documentation for details about overflow, etc.
+//
+// Example:
+//
+// absl::Duration d = absl::Milliseconds(1500);
+// double dsec = absl::ToDoubleSeconds(d); // dsec == 1.5
+double ToDoubleNanoseconds(Duration d);
+double ToDoubleMicroseconds(Duration d);
+double ToDoubleMilliseconds(Duration d);
+double ToDoubleSeconds(Duration d);
+double ToDoubleMinutes(Duration d);
+double ToDoubleHours(Duration d);
+
+// FromChrono()
+//
+// Converts any of the pre-defined std::chrono durations to an absl::Duration.
+//
+// Example:
+//
+// std::chrono::milliseconds ms(123);
+// absl::Duration d = absl::FromChrono(ms);
+constexpr Duration FromChrono(const std::chrono::nanoseconds& d);
+constexpr Duration FromChrono(const std::chrono::microseconds& d);
+constexpr Duration FromChrono(const std::chrono::milliseconds& d);
+constexpr Duration FromChrono(const std::chrono::seconds& d);
+constexpr Duration FromChrono(const std::chrono::minutes& d);
+constexpr Duration FromChrono(const std::chrono::hours& d);
+
+// ToChronoNanoseconds()
+// ToChronoMicroseconds()
+// ToChronoMilliseconds()
+// ToChronoSeconds()
+// ToChronoMinutes()
+// ToChronoHours()
+//
+// Converts an absl::Duration to any of the pre-defined std::chrono durations.
+// If overflow would occur, the returned value will saturate at the min/max
+// chrono duration value instead.
+//
+// Example:
+//
+// absl::Duration d = absl::Microseconds(123);
+// auto x = absl::ToChronoMicroseconds(d);
+// auto y = absl::ToChronoNanoseconds(d); // x == y
+// auto z = absl::ToChronoSeconds(absl::InfiniteDuration());
+// // z == std::chrono::seconds::max()
+std::chrono::nanoseconds ToChronoNanoseconds(Duration d);
+std::chrono::microseconds ToChronoMicroseconds(Duration d);
+std::chrono::milliseconds ToChronoMilliseconds(Duration d);
+std::chrono::seconds ToChronoSeconds(Duration d);
+std::chrono::minutes ToChronoMinutes(Duration d);
+std::chrono::hours ToChronoHours(Duration d);
+
+// FormatDuration()
+//
+// Returns a string representing the duration in the form "72h3m0.5s".
+// Returns "inf" or "-inf" for +/- `InfiniteDuration()`.
+std::string FormatDuration(Duration d);
+
+// Output stream operator.
+inline std::ostream& operator<<(std::ostream& os, Duration d) {
+ return os << FormatDuration(d);
+}
+
+// ParseDuration()
+//
+// Parses a duration string consisting of a possibly signed sequence of
+// decimal numbers, each with an optional fractional part and a unit
+// suffix. The valid suffixes are "ns", "us" "ms", "s", "m", and "h".
+// Simple examples include "300ms", "-1.5h", and "2h45m". Parses "0" as
+// `ZeroDuration()`. Parses "inf" and "-inf" as +/- `InfiniteDuration()`.
+bool ParseDuration(absl::string_view dur_string, Duration* d);
+
+// Support for flag values of type Duration. Duration flags must be specified
+// in a format that is valid input for absl::ParseDuration().
+bool AbslParseFlag(absl::string_view text, Duration* dst, std::string* error);
+std::string AbslUnparseFlag(Duration d);
+ABSL_DEPRECATED("Use AbslParseFlag() instead.")
+bool ParseFlag(const std::string& text, Duration* dst, std::string* error);
+ABSL_DEPRECATED("Use AbslUnparseFlag() instead.")
+std::string UnparseFlag(Duration d);
+
+// Time
+//
+// An `absl::Time` represents a specific instant in time. Arithmetic operators
+// are provided for naturally expressing time calculations. Instances are
+// created using `absl::Now()` and the `absl::From*()` factory functions that
+// accept the gamut of other time representations. Formatting and parsing
+// functions are provided for conversion to and from strings. `absl::Time`
+// should be passed by value rather than const reference.
+//
+// `absl::Time` assumes there are 60 seconds in a minute, which means the
+// underlying time scales must be "smeared" to eliminate leap seconds.
+// See https://developers.google.com/time/smear.
+//
+// Even though `absl::Time` supports a wide range of timestamps, exercise
+// caution when using values in the distant past. `absl::Time` uses the
+// Proleptic Gregorian calendar, which extends the Gregorian calendar backward
+// to dates before its introduction in 1582.
+// See https://en.wikipedia.org/wiki/Proleptic_Gregorian_calendar
+// for more information. Use the ICU calendar classes to convert a date in
+// some other calendar (http://userguide.icu-project.org/datetime/calendar).
+//
+// Similarly, standardized time zones are a reasonably recent innovation, with
+// the Greenwich prime meridian being established in 1884. The TZ database
+// itself does not profess accurate offsets for timestamps prior to 1970. The
+// breakdown of future timestamps is subject to the whim of regional
+// governments.
+//
+// The `absl::Time` class represents an instant in time as a count of clock
+// ticks of some granularity (resolution) from some starting point (epoch).
+//
+// `absl::Time` uses a resolution that is high enough to avoid loss in
+// precision, and a range that is wide enough to avoid overflow, when
+// converting between tick counts in most Google time scales (i.e., resolution
+// of at least one nanosecond, and range +/-100 billion years). Conversions
+// between the time scales are performed by truncating (towards negative
+// infinity) to the nearest representable point.
+//
+// Examples:
+//
+// absl::Time t1 = ...;
+// absl::Time t2 = t1 + absl::Minutes(2);
+// absl::Duration d = t2 - t1; // == absl::Minutes(2)
+//
+class Time {
+ public:
+ // Value semantics.
+
+ // Returns the Unix epoch. However, those reading your code may not know
+ // or expect the Unix epoch as the default value, so make your code more
+ // readable by explicitly initializing all instances before use.
+ //
+ // Example:
+ // absl::Time t = absl::UnixEpoch();
+ // absl::Time t = absl::Now();
+ // absl::Time t = absl::TimeFromTimeval(tv);
+ // absl::Time t = absl::InfinitePast();
+ constexpr Time() = default;
+
+ // Copyable.
+ constexpr Time(const Time& t) = default;
+ Time& operator=(const Time& t) = default;
+
+ // Assignment operators.
+ Time& operator+=(Duration d) {
+ rep_ += d;
+ return *this;
+ }
+ Time& operator-=(Duration d) {
+ rep_ -= d;
+ return *this;
+ }
+
+ // Time::Breakdown
+ //
+ // The calendar and wall-clock (aka "civil time") components of an
+ // `absl::Time` in a certain `absl::TimeZone`. This struct is not
+ // intended to represent an instant in time. So, rather than passing
+ // a `Time::Breakdown` to a function, pass an `absl::Time` and an
+ // `absl::TimeZone`.
+ //
+ // Deprecated. Use `absl::TimeZone::CivilInfo`.
+ struct
+ Breakdown {
+ int64_t year; // year (e.g., 2013)
+ int month; // month of year [1:12]
+ int day; // day of month [1:31]
+ int hour; // hour of day [0:23]
+ int minute; // minute of hour [0:59]
+ int second; // second of minute [0:59]
+ Duration subsecond; // [Seconds(0):Seconds(1)) if finite
+ int weekday; // 1==Mon, ..., 7=Sun
+ int yearday; // day of year [1:366]
+
+ // Note: The following fields exist for backward compatibility
+ // with older APIs. Accessing these fields directly is a sign of
+ // imprudent logic in the calling code. Modern time-related code
+ // should only access this data indirectly by way of FormatTime().
+ // These fields are undefined for InfiniteFuture() and InfinitePast().
+ int offset; // seconds east of UTC
+ bool is_dst; // is offset non-standard?
+ const char* zone_abbr; // time-zone abbreviation (e.g., "PST")
+ };
+
+ // Time::In()
+ //
+ // Returns the breakdown of this instant in the given TimeZone.
+ //
+ // Deprecated. Use `absl::TimeZone::At(Time)`.
+ Breakdown In(TimeZone tz) const;
+
+ template <typename H>
+ friend H AbslHashValue(H h, Time t) {
+ return H::combine(std::move(h), t.rep_);
+ }
+
+ private:
+ friend constexpr Time time_internal::FromUnixDuration(Duration d);
+ friend constexpr Duration time_internal::ToUnixDuration(Time t);
+ friend constexpr bool operator<(Time lhs, Time rhs);
+ friend constexpr bool operator==(Time lhs, Time rhs);
+ friend Duration operator-(Time lhs, Time rhs);
+ friend constexpr Time UniversalEpoch();
+ friend constexpr Time InfiniteFuture();
+ friend constexpr Time InfinitePast();
+ constexpr explicit Time(Duration rep) : rep_(rep) {}
+ Duration rep_;
+};
+
+// Relational Operators
+constexpr bool operator<(Time lhs, Time rhs) { return lhs.rep_ < rhs.rep_; }
+constexpr bool operator>(Time lhs, Time rhs) { return rhs < lhs; }
+constexpr bool operator>=(Time lhs, Time rhs) { return !(lhs < rhs); }
+constexpr bool operator<=(Time lhs, Time rhs) { return !(rhs < lhs); }
+constexpr bool operator==(Time lhs, Time rhs) { return lhs.rep_ == rhs.rep_; }
+constexpr bool operator!=(Time lhs, Time rhs) { return !(lhs == rhs); }
+
+// Additive Operators
+inline Time operator+(Time lhs, Duration rhs) { return lhs += rhs; }
+inline Time operator+(Duration lhs, Time rhs) { return rhs += lhs; }
+inline Time operator-(Time lhs, Duration rhs) { return lhs -= rhs; }
+inline Duration operator-(Time lhs, Time rhs) { return lhs.rep_ - rhs.rep_; }
+
+// UnixEpoch()
+//
+// Returns the `absl::Time` representing "1970-01-01 00:00:00.0 +0000".
+constexpr Time UnixEpoch() { return Time(); }
+
+// UniversalEpoch()
+//
+// Returns the `absl::Time` representing "0001-01-01 00:00:00.0 +0000", the
+// epoch of the ICU Universal Time Scale.
+constexpr Time UniversalEpoch() {
+ // 719162 is the number of days from 0001-01-01 to 1970-01-01,
+ // assuming the Gregorian calendar.
+ return Time(time_internal::MakeDuration(-24 * 719162 * int64_t{3600}, 0U));
+}
+
+// InfiniteFuture()
+//
+// Returns an `absl::Time` that is infinitely far in the future.
+constexpr Time InfiniteFuture() {
+ return Time(
+ time_internal::MakeDuration((std::numeric_limits<int64_t>::max)(), ~0U));
+}
+
+// InfinitePast()
+//
+// Returns an `absl::Time` that is infinitely far in the past.
+constexpr Time InfinitePast() {
+ return Time(
+ time_internal::MakeDuration((std::numeric_limits<int64_t>::min)(), ~0U));
+}
+
+// FromUnixNanos()
+// FromUnixMicros()
+// FromUnixMillis()
+// FromUnixSeconds()
+// FromTimeT()
+// FromUDate()
+// FromUniversal()
+//
+// Creates an `absl::Time` from a variety of other representations.
+constexpr Time FromUnixNanos(int64_t ns);
+constexpr Time FromUnixMicros(int64_t us);
+constexpr Time FromUnixMillis(int64_t ms);
+constexpr Time FromUnixSeconds(int64_t s);
+constexpr Time FromTimeT(time_t t);
+Time FromUDate(double udate);
+Time FromUniversal(int64_t universal);
+
+// ToUnixNanos()
+// ToUnixMicros()
+// ToUnixMillis()
+// ToUnixSeconds()
+// ToTimeT()
+// ToUDate()
+// ToUniversal()
+//
+// Converts an `absl::Time` to a variety of other representations. Note that
+// these operations round down toward negative infinity where necessary to
+// adjust to the resolution of the result type. Beware of possible time_t
+// over/underflow in ToTime{T,val,spec}() on 32-bit platforms.
+int64_t ToUnixNanos(Time t);
+int64_t ToUnixMicros(Time t);
+int64_t ToUnixMillis(Time t);
+int64_t ToUnixSeconds(Time t);
+time_t ToTimeT(Time t);
+double ToUDate(Time t);
+int64_t ToUniversal(Time t);
+
+// DurationFromTimespec()
+// DurationFromTimeval()
+// ToTimespec()
+// ToTimeval()
+// TimeFromTimespec()
+// TimeFromTimeval()
+// ToTimespec()
+// ToTimeval()
+//
+// Some APIs use a timespec or a timeval as a Duration (e.g., nanosleep(2)
+// and select(2)), while others use them as a Time (e.g. clock_gettime(2)
+// and gettimeofday(2)), so conversion functions are provided for both cases.
+// The "to timespec/val" direction is easily handled via overloading, but
+// for "from timespec/val" the desired type is part of the function name.
+Duration DurationFromTimespec(timespec ts);
+Duration DurationFromTimeval(timeval tv);
+timespec ToTimespec(Duration d);
+timeval ToTimeval(Duration d);
+Time TimeFromTimespec(timespec ts);
+Time TimeFromTimeval(timeval tv);
+timespec ToTimespec(Time t);
+timeval ToTimeval(Time t);
+
+// FromChrono()
+//
+// Converts a std::chrono::system_clock::time_point to an absl::Time.
+//
+// Example:
+//
+// auto tp = std::chrono::system_clock::from_time_t(123);
+// absl::Time t = absl::FromChrono(tp);
+// // t == absl::FromTimeT(123)
+Time FromChrono(const std::chrono::system_clock::time_point& tp);
+
+// ToChronoTime()
+//
+// Converts an absl::Time to a std::chrono::system_clock::time_point. If
+// overflow would occur, the returned value will saturate at the min/max time
+// point value instead.
+//
+// Example:
+//
+// absl::Time t = absl::FromTimeT(123);
+// auto tp = absl::ToChronoTime(t);
+// // tp == std::chrono::system_clock::from_time_t(123);
+std::chrono::system_clock::time_point ToChronoTime(Time);
+
+// Support for flag values of type Time. Time flags must be specified in a
+// format that matches absl::RFC3339_full. For example:
+//
+// --start_time=2016-01-02T03:04:05.678+08:00
+//
+// Note: A UTC offset (or 'Z' indicating a zero-offset from UTC) is required.
+//
+// Additionally, if you'd like to specify a time as a count of
+// seconds/milliseconds/etc from the Unix epoch, use an absl::Duration flag
+// and add that duration to absl::UnixEpoch() to get an absl::Time.
+bool AbslParseFlag(absl::string_view text, Time* t, std::string* error);
+std::string AbslUnparseFlag(Time t);
+ABSL_DEPRECATED("Use AbslParseFlag() instead.")
+bool ParseFlag(const std::string& text, Time* t, std::string* error);
+ABSL_DEPRECATED("Use AbslUnparseFlag() instead.")
+std::string UnparseFlag(Time t);
+
+// TimeZone
+//
+// The `absl::TimeZone` is an opaque, small, value-type class representing a
+// geo-political region within which particular rules are used for converting
+// between absolute and civil times (see https://git.io/v59Ly). `absl::TimeZone`
+// values are named using the TZ identifiers from the IANA Time Zone Database,
+// such as "America/Los_Angeles" or "Australia/Sydney". `absl::TimeZone` values
+// are created from factory functions such as `absl::LoadTimeZone()`. Note:
+// strings like "PST" and "EDT" are not valid TZ identifiers. Prefer to pass by
+// value rather than const reference.
+//
+// For more on the fundamental concepts of time zones, absolute times, and civil
+// times, see https://github.com/google/cctz#fundamental-concepts
+//
+// Examples:
+//
+// absl::TimeZone utc = absl::UTCTimeZone();
+// absl::TimeZone pst = absl::FixedTimeZone(-8 * 60 * 60);
+// absl::TimeZone loc = absl::LocalTimeZone();
+// absl::TimeZone lax;
+// if (!absl::LoadTimeZone("America/Los_Angeles", &lax)) {
+// // handle error case
+// }
+//
+// See also:
+// - https://github.com/google/cctz
+// - https://www.iana.org/time-zones
+// - https://en.wikipedia.org/wiki/Zoneinfo
+class TimeZone {
+ public:
+ explicit TimeZone(time_internal::cctz::time_zone tz) : cz_(tz) {}
+ TimeZone() = default; // UTC, but prefer UTCTimeZone() to be explicit.
+
+ // Copyable.
+ TimeZone(const TimeZone&) = default;
+ TimeZone& operator=(const TimeZone&) = default;
+
+ explicit operator time_internal::cctz::time_zone() const { return cz_; }
+
+ std::string name() const { return cz_.name(); }
+
+ // TimeZone::CivilInfo
+ //
+ // Information about the civil time corresponding to an absolute time.
+ // This struct is not intended to represent an instant in time. So, rather
+ // than passing a `TimeZone::CivilInfo` to a function, pass an `absl::Time`
+ // and an `absl::TimeZone`.
+ struct CivilInfo {
+ CivilSecond cs;
+ Duration subsecond;
+
+ // Note: The following fields exist for backward compatibility
+ // with older APIs. Accessing these fields directly is a sign of
+ // imprudent logic in the calling code. Modern time-related code
+ // should only access this data indirectly by way of FormatTime().
+ // These fields are undefined for InfiniteFuture() and InfinitePast().
+ int offset; // seconds east of UTC
+ bool is_dst; // is offset non-standard?
+ const char* zone_abbr; // time-zone abbreviation (e.g., "PST")
+ };
+
+ // TimeZone::At(Time)
+ //
+ // Returns the civil time for this TimeZone at a certain `absl::Time`.
+ // If the input time is infinite, the output civil second will be set to
+ // CivilSecond::max() or min(), and the subsecond will be infinite.
+ //
+ // Example:
+ //
+ // const auto epoch = lax.At(absl::UnixEpoch());
+ // // epoch.cs == 1969-12-31 16:00:00
+ // // epoch.subsecond == absl::ZeroDuration()
+ // // epoch.offset == -28800
+ // // epoch.is_dst == false
+ // // epoch.abbr == "PST"
+ CivilInfo At(Time t) const;
+
+ // TimeZone::TimeInfo
+ //
+ // Information about the absolute times corresponding to a civil time.
+ // (Subseconds must be handled separately.)
+ //
+ // It is possible for a caller to pass a civil-time value that does
+ // not represent an actual or unique instant in time (due to a shift
+ // in UTC offset in the TimeZone, which results in a discontinuity in
+ // the civil-time components). For example, a daylight-saving-time
+ // transition skips or repeats civil times---in the United States,
+ // March 13, 2011 02:15 never occurred, while November 6, 2011 01:15
+ // occurred twice---so requests for such times are not well-defined.
+ // To account for these possibilities, `absl::TimeZone::TimeInfo` is
+ // richer than just a single `absl::Time`.
+ struct TimeInfo {
+ enum CivilKind {
+ UNIQUE, // the civil time was singular (pre == trans == post)
+ SKIPPED, // the civil time did not exist (pre >= trans > post)
+ REPEATED, // the civil time was ambiguous (pre < trans <= post)
+ } kind;
+ Time pre; // time calculated using the pre-transition offset
+ Time trans; // when the civil-time discontinuity occurred
+ Time post; // time calculated using the post-transition offset
+ };
+
+ // TimeZone::At(CivilSecond)
+ //
+ // Returns an `absl::TimeInfo` containing the absolute time(s) for this
+ // TimeZone at an `absl::CivilSecond`. When the civil time is skipped or
+ // repeated, returns times calculated using the pre-transition and post-
+ // transition UTC offsets, plus the transition time itself.
+ //
+ // Examples:
+ //
+ // // A unique civil time
+ // const auto jan01 = lax.At(absl::CivilSecond(2011, 1, 1, 0, 0, 0));
+ // // jan01.kind == TimeZone::TimeInfo::UNIQUE
+ // // jan01.pre is 2011-01-01 00:00:00 -0800
+ // // jan01.trans is 2011-01-01 00:00:00 -0800
+ // // jan01.post is 2011-01-01 00:00:00 -0800
+ //
+ // // A Spring DST transition, when there is a gap in civil time
+ // const auto mar13 = lax.At(absl::CivilSecond(2011, 3, 13, 2, 15, 0));
+ // // mar13.kind == TimeZone::TimeInfo::SKIPPED
+ // // mar13.pre is 2011-03-13 03:15:00 -0700
+ // // mar13.trans is 2011-03-13 03:00:00 -0700
+ // // mar13.post is 2011-03-13 01:15:00 -0800
+ //
+ // // A Fall DST transition, when civil times are repeated
+ // const auto nov06 = lax.At(absl::CivilSecond(2011, 11, 6, 1, 15, 0));
+ // // nov06.kind == TimeZone::TimeInfo::REPEATED
+ // // nov06.pre is 2011-11-06 01:15:00 -0700
+ // // nov06.trans is 2011-11-06 01:00:00 -0800
+ // // nov06.post is 2011-11-06 01:15:00 -0800
+ TimeInfo At(CivilSecond ct) const;
+
+ // TimeZone::NextTransition()
+ // TimeZone::PrevTransition()
+ //
+ // Finds the time of the next/previous offset change in this time zone.
+ //
+ // By definition, `NextTransition(t, &trans)` returns false when `t` is
+ // `InfiniteFuture()`, and `PrevTransition(t, &trans)` returns false
+ // when `t` is `InfinitePast()`. If the zone has no transitions, the
+ // result will also be false no matter what the argument.
+ //
+ // Otherwise, when `t` is `InfinitePast()`, `NextTransition(t, &trans)`
+ // returns true and sets `trans` to the first recorded transition. Chains
+ // of calls to `NextTransition()/PrevTransition()` will eventually return
+ // false, but it is unspecified exactly when `NextTransition(t, &trans)`
+ // jumps to false, or what time is set by `PrevTransition(t, &trans)` for
+ // a very distant `t`.
+ //
+ // Note: Enumeration of time-zone transitions is for informational purposes
+ // only. Modern time-related code should not care about when offset changes
+ // occur.
+ //
+ // Example:
+ // absl::TimeZone nyc;
+ // if (!absl::LoadTimeZone("America/New_York", &nyc)) { ... }
+ // const auto now = absl::Now();
+ // auto t = absl::InfinitePast();
+ // absl::TimeZone::CivilTransition trans;
+ // while (t <= now && nyc.NextTransition(t, &trans)) {
+ // // transition: trans.from -> trans.to
+ // t = nyc.At(trans.to).trans;
+ // }
+ struct CivilTransition {
+ CivilSecond from; // the civil time we jump from
+ CivilSecond to; // the civil time we jump to
+ };
+ bool NextTransition(Time t, CivilTransition* trans) const;
+ bool PrevTransition(Time t, CivilTransition* trans) const;
+
+ template <typename H>
+ friend H AbslHashValue(H h, TimeZone tz) {
+ return H::combine(std::move(h), tz.cz_);
+ }
+
+ private:
+ friend bool operator==(TimeZone a, TimeZone b) { return a.cz_ == b.cz_; }
+ friend bool operator!=(TimeZone a, TimeZone b) { return a.cz_ != b.cz_; }
+ friend std::ostream& operator<<(std::ostream& os, TimeZone tz) {
+ return os << tz.name();
+ }
+
+ time_internal::cctz::time_zone cz_;
+};
+
+// LoadTimeZone()
+//
+// Loads the named zone. May perform I/O on the initial load of the named
+// zone. If the name is invalid, or some other kind of error occurs, returns
+// `false` and `*tz` is set to the UTC time zone.
+inline bool LoadTimeZone(absl::string_view name, TimeZone* tz) {
+ if (name == "localtime") {
+ *tz = TimeZone(time_internal::cctz::local_time_zone());
+ return true;
+ }
+ time_internal::cctz::time_zone cz;
+ const bool b = time_internal::cctz::load_time_zone(std::string(name), &cz);
+ *tz = TimeZone(cz);
+ return b;
+}
+
+// FixedTimeZone()
+//
+// Returns a TimeZone that is a fixed offset (seconds east) from UTC.
+// Note: If the absolute value of the offset is greater than 24 hours
+// you'll get UTC (i.e., no offset) instead.
+inline TimeZone FixedTimeZone(int seconds) {
+ return TimeZone(
+ time_internal::cctz::fixed_time_zone(std::chrono::seconds(seconds)));
+}
+
+// UTCTimeZone()
+//
+// Convenience method returning the UTC time zone.
+inline TimeZone UTCTimeZone() {
+ return TimeZone(time_internal::cctz::utc_time_zone());
+}
+
+// LocalTimeZone()
+//
+// Convenience method returning the local time zone, or UTC if there is
+// no configured local zone. Warning: Be wary of using LocalTimeZone(),
+// and particularly so in a server process, as the zone configured for the
+// local machine should be irrelevant. Prefer an explicit zone name.
+inline TimeZone LocalTimeZone() {
+ return TimeZone(time_internal::cctz::local_time_zone());
+}
+
+// ToCivilSecond()
+// ToCivilMinute()
+// ToCivilHour()
+// ToCivilDay()
+// ToCivilMonth()
+// ToCivilYear()
+//
+// Helpers for TimeZone::At(Time) to return particularly aligned civil times.
+//
+// Example:
+//
+// absl::Time t = ...;
+// absl::TimeZone tz = ...;
+// const auto cd = absl::ToCivilDay(t, tz);
+inline CivilSecond ToCivilSecond(Time t, TimeZone tz) {
+ return tz.At(t).cs; // already a CivilSecond
+}
+inline CivilMinute ToCivilMinute(Time t, TimeZone tz) {
+ return CivilMinute(tz.At(t).cs);
+}
+inline CivilHour ToCivilHour(Time t, TimeZone tz) {
+ return CivilHour(tz.At(t).cs);
+}
+inline CivilDay ToCivilDay(Time t, TimeZone tz) {
+ return CivilDay(tz.At(t).cs);
+}
+inline CivilMonth ToCivilMonth(Time t, TimeZone tz) {
+ return CivilMonth(tz.At(t).cs);
+}
+inline CivilYear ToCivilYear(Time t, TimeZone tz) {
+ return CivilYear(tz.At(t).cs);
+}
+
+// FromCivil()
+//
+// Helper for TimeZone::At(CivilSecond) that provides "order-preserving
+// semantics." If the civil time maps to a unique time, that time is
+// returned. If the civil time is repeated in the given time zone, the
+// time using the pre-transition offset is returned. Otherwise, the
+// civil time is skipped in the given time zone, and the transition time
+// is returned. This means that for any two civil times, ct1 and ct2,
+// (ct1 < ct2) => (FromCivil(ct1) <= FromCivil(ct2)), the equal case
+// being when two non-existent civil times map to the same transition time.
+//
+// Note: Accepts civil times of any alignment.
+inline Time FromCivil(CivilSecond ct, TimeZone tz) {
+ const auto ti = tz.At(ct);
+ if (ti.kind == TimeZone::TimeInfo::SKIPPED) return ti.trans;
+ return ti.pre;
+}
+
+// TimeConversion
+//
+// An `absl::TimeConversion` represents the conversion of year, month, day,
+// hour, minute, and second values (i.e., a civil time), in a particular
+// `absl::TimeZone`, to a time instant (an absolute time), as returned by
+// `absl::ConvertDateTime()`. Legacy version of `absl::TimeZone::TimeInfo`.
+//
+// Deprecated. Use `absl::TimeZone::TimeInfo`.
+struct
+ TimeConversion {
+ Time pre; // time calculated using the pre-transition offset
+ Time trans; // when the civil-time discontinuity occurred
+ Time post; // time calculated using the post-transition offset
+
+ enum Kind {
+ UNIQUE, // the civil time was singular (pre == trans == post)
+ SKIPPED, // the civil time did not exist
+ REPEATED, // the civil time was ambiguous
+ };
+ Kind kind;
+
+ bool normalized; // input values were outside their valid ranges
+};
+
+// ConvertDateTime()
+//
+// Legacy version of `absl::TimeZone::At(absl::CivilSecond)` that takes
+// the civil time as six, separate values (YMDHMS).
+//
+// The input month, day, hour, minute, and second values can be outside
+// of their valid ranges, in which case they will be "normalized" during
+// the conversion.
+//
+// Example:
+//
+// // "October 32" normalizes to "November 1".
+// absl::TimeConversion tc =
+// absl::ConvertDateTime(2013, 10, 32, 8, 30, 0, lax);
+// // tc.kind == TimeConversion::UNIQUE && tc.normalized == true
+// // absl::ToCivilDay(tc.pre, tz).month() == 11
+// // absl::ToCivilDay(tc.pre, tz).day() == 1
+//
+// Deprecated. Use `absl::TimeZone::At(CivilSecond)`.
+TimeConversion ConvertDateTime(int64_t year, int mon, int day, int hour,
+ int min, int sec, TimeZone tz);
+
+// FromDateTime()
+//
+// A convenience wrapper for `absl::ConvertDateTime()` that simply returns
+// the "pre" `absl::Time`. That is, the unique result, or the instant that
+// is correct using the pre-transition offset (as if the transition never
+// happened).
+//
+// Example:
+//
+// absl::Time t = absl::FromDateTime(2017, 9, 26, 9, 30, 0, lax);
+// // t = 2017-09-26 09:30:00 -0700
+//
+// Deprecated. Use `absl::FromCivil(CivilSecond, TimeZone)`. Note that the
+// behavior of `FromCivil()` differs from `FromDateTime()` for skipped civil
+// times. If you care about that see `absl::TimeZone::At(absl::CivilSecond)`.
+inline Time FromDateTime(int64_t year, int mon, int day, int hour,
+ int min, int sec, TimeZone tz) {
+ return ConvertDateTime(year, mon, day, hour, min, sec, tz).pre;
+}
+
+// FromTM()
+//
+// Converts the `tm_year`, `tm_mon`, `tm_mday`, `tm_hour`, `tm_min`, and
+// `tm_sec` fields to an `absl::Time` using the given time zone. See ctime(3)
+// for a description of the expected values of the tm fields. If the indicated
+// time instant is not unique (see `absl::TimeZone::At(absl::CivilSecond)`
+// above), the `tm_isdst` field is consulted to select the desired instant
+// (`tm_isdst` > 0 means DST, `tm_isdst` == 0 means no DST, `tm_isdst` < 0
+// means use the post-transition offset).
+Time FromTM(const struct tm& tm, TimeZone tz);
+
+// ToTM()
+//
+// Converts the given `absl::Time` to a struct tm using the given time zone.
+// See ctime(3) for a description of the values of the tm fields.
+struct tm ToTM(Time t, TimeZone tz);
+
+// RFC3339_full
+// RFC3339_sec
+//
+// FormatTime()/ParseTime() format specifiers for RFC3339 date/time strings,
+// with trailing zeros trimmed or with fractional seconds omitted altogether.
+//
+// Note that RFC3339_sec[] matches an ISO 8601 extended format for date and
+// time with UTC offset. Also note the use of "%Y": RFC3339 mandates that
+// years have exactly four digits, but we allow them to take their natural
+// width.
+ABSL_DLL extern const char RFC3339_full[]; // %Y-%m-%d%ET%H:%M:%E*S%Ez
+ABSL_DLL extern const char RFC3339_sec[]; // %Y-%m-%d%ET%H:%M:%S%Ez
+
+// RFC1123_full
+// RFC1123_no_wday
+//
+// FormatTime()/ParseTime() format specifiers for RFC1123 date/time strings.
+ABSL_DLL extern const char RFC1123_full[]; // %a, %d %b %E4Y %H:%M:%S %z
+ABSL_DLL extern const char RFC1123_no_wday[]; // %d %b %E4Y %H:%M:%S %z
+
+// FormatTime()
+//
+// Formats the given `absl::Time` in the `absl::TimeZone` according to the
+// provided format string. Uses strftime()-like formatting options, with
+// the following extensions:
+//
+// - %Ez - RFC3339-compatible numeric UTC offset (+hh:mm or -hh:mm)
+// - %E*z - Full-resolution numeric UTC offset (+hh:mm:ss or -hh:mm:ss)
+// - %E#S - Seconds with # digits of fractional precision
+// - %E*S - Seconds with full fractional precision (a literal '*')
+// - %E#f - Fractional seconds with # digits of precision
+// - %E*f - Fractional seconds with full precision (a literal '*')
+// - %E4Y - Four-character years (-999 ... -001, 0000, 0001 ... 9999)
+// - %ET - The RFC3339 "date-time" separator "T"
+//
+// Note that %E0S behaves like %S, and %E0f produces no characters. In
+// contrast %E*f always produces at least one digit, which may be '0'.
+//
+// Note that %Y produces as many characters as it takes to fully render the
+// year. A year outside of [-999:9999] when formatted with %E4Y will produce
+// more than four characters, just like %Y.
+//
+// We recommend that format strings include the UTC offset (%z, %Ez, or %E*z)
+// so that the result uniquely identifies a time instant.
+//
+// Example:
+//
+// absl::CivilSecond cs(2013, 1, 2, 3, 4, 5);
+// absl::Time t = absl::FromCivil(cs, lax);
+// std::string f = absl::FormatTime("%H:%M:%S", t, lax); // "03:04:05"
+// f = absl::FormatTime("%H:%M:%E3S", t, lax); // "03:04:05.000"
+//
+// Note: If the given `absl::Time` is `absl::InfiniteFuture()`, the returned
+// string will be exactly "infinite-future". If the given `absl::Time` is
+// `absl::InfinitePast()`, the returned string will be exactly "infinite-past".
+// In both cases the given format string and `absl::TimeZone` are ignored.
+//
+std::string FormatTime(absl::string_view format, Time t, TimeZone tz);
+
+// Convenience functions that format the given time using the RFC3339_full
+// format. The first overload uses the provided TimeZone, while the second
+// uses LocalTimeZone().
+std::string FormatTime(Time t, TimeZone tz);
+std::string FormatTime(Time t);
+
+// Output stream operator.
+inline std::ostream& operator<<(std::ostream& os, Time t) {
+ return os << FormatTime(t);
+}
+
+// ParseTime()
+//
+// Parses an input string according to the provided format string and
+// returns the corresponding `absl::Time`. Uses strftime()-like formatting
+// options, with the same extensions as FormatTime(), but with the
+// exceptions that %E#S is interpreted as %E*S, and %E#f as %E*f. %Ez
+// and %E*z also accept the same inputs, which (along with %z) includes
+// 'z' and 'Z' as synonyms for +00:00. %ET accepts either 'T' or 't'.
+//
+// %Y consumes as many numeric characters as it can, so the matching data
+// should always be terminated with a non-numeric. %E4Y always consumes
+// exactly four characters, including any sign.
+//
+// Unspecified fields are taken from the default date and time of ...
+//
+// "1970-01-01 00:00:00.0 +0000"
+//
+// For example, parsing a string of "15:45" (%H:%M) will return an absl::Time
+// that represents "1970-01-01 15:45:00.0 +0000".
+//
+// Note that since ParseTime() returns time instants, it makes the most sense
+// to parse fully-specified date/time strings that include a UTC offset (%z,
+// %Ez, or %E*z).
+//
+// Note also that `absl::ParseTime()` only heeds the fields year, month, day,
+// hour, minute, (fractional) second, and UTC offset. Other fields, like
+// weekday (%a or %A), while parsed for syntactic validity, are ignored
+// in the conversion.
+//
+// Date and time fields that are out-of-range will be treated as errors
+// rather than normalizing them like `absl::CivilSecond` does. For example,
+// it is an error to parse the date "Oct 32, 2013" because 32 is out of range.
+//
+// A leap second of ":60" is normalized to ":00" of the following minute
+// with fractional seconds discarded. The following table shows how the
+// given seconds and subseconds will be parsed:
+//
+// "59.x" -> 59.x // exact
+// "60.x" -> 00.0 // normalized
+// "00.x" -> 00.x // exact
+//
+// Errors are indicated by returning false and assigning an error message
+// to the "err" out param if it is non-null.
+//
+// Note: If the input string is exactly "infinite-future", the returned
+// `absl::Time` will be `absl::InfiniteFuture()` and `true` will be returned.
+// If the input string is "infinite-past", the returned `absl::Time` will be
+// `absl::InfinitePast()` and `true` will be returned.
+//
+bool ParseTime(absl::string_view format, absl::string_view input, Time* time,
+ std::string* err);
+
+// Like ParseTime() above, but if the format string does not contain a UTC
+// offset specification (%z/%Ez/%E*z) then the input is interpreted in the
+// given TimeZone. This means that the input, by itself, does not identify a
+// unique instant. Being time-zone dependent, it also admits the possibility
+// of ambiguity or non-existence, in which case the "pre" time (as defined
+// by TimeZone::TimeInfo) is returned. For these reasons we recommend that
+// all date/time strings include a UTC offset so they're context independent.
+bool ParseTime(absl::string_view format, absl::string_view input, TimeZone tz,
+ Time* time, std::string* err);
+
+// ============================================================================
+// Implementation Details Follow
+// ============================================================================
+
+namespace time_internal {
+
+// Creates a Duration with a given representation.
+// REQUIRES: hi,lo is a valid representation of a Duration as specified
+// in time/duration.cc.
+constexpr Duration MakeDuration(int64_t hi, uint32_t lo = 0) {
+ return Duration(hi, lo);
+}
+
+constexpr Duration MakeDuration(int64_t hi, int64_t lo) {
+ return MakeDuration(hi, static_cast<uint32_t>(lo));
+}
+
+// Make a Duration value from a floating-point number, as long as that number
+// is in the range [ 0 .. numeric_limits<int64_t>::max ), that is, as long as
+// it's positive and can be converted to int64_t without risk of UB.
+inline Duration MakePosDoubleDuration(double n) {
+ const int64_t int_secs = static_cast<int64_t>(n);
+ const uint32_t ticks = static_cast<uint32_t>(
+ (n - static_cast<double>(int_secs)) * kTicksPerSecond + 0.5);
+ return ticks < kTicksPerSecond
+ ? MakeDuration(int_secs, ticks)
+ : MakeDuration(int_secs + 1, ticks - kTicksPerSecond);
+}
+
+// Creates a normalized Duration from an almost-normalized (sec,ticks)
+// pair. sec may be positive or negative. ticks must be in the range
+// -kTicksPerSecond < *ticks < kTicksPerSecond. If ticks is negative it
+// will be normalized to a positive value in the resulting Duration.
+constexpr Duration MakeNormalizedDuration(int64_t sec, int64_t ticks) {
+ return (ticks < 0) ? MakeDuration(sec - 1, ticks + kTicksPerSecond)
+ : MakeDuration(sec, ticks);
+}
+
+// Provide access to the Duration representation.
+constexpr int64_t GetRepHi(Duration d) { return d.rep_hi_; }
+constexpr uint32_t GetRepLo(Duration d) { return d.rep_lo_; }
+
+// Returns true iff d is positive or negative infinity.
+constexpr bool IsInfiniteDuration(Duration d) { return GetRepLo(d) == ~0U; }
+
+// Returns an infinite Duration with the opposite sign.
+// REQUIRES: IsInfiniteDuration(d)
+constexpr Duration OppositeInfinity(Duration d) {
+ return GetRepHi(d) < 0
+ ? MakeDuration((std::numeric_limits<int64_t>::max)(), ~0U)
+ : MakeDuration((std::numeric_limits<int64_t>::min)(), ~0U);
+}
+
+// Returns (-n)-1 (equivalently -(n+1)) without avoidable overflow.
+constexpr int64_t NegateAndSubtractOne(int64_t n) {
+ // Note: Good compilers will optimize this expression to ~n when using
+ // a two's-complement representation (which is required for int64_t).
+ return (n < 0) ? -(n + 1) : (-n) - 1;
+}
+
+// Map between a Time and a Duration since the Unix epoch. Note that these
+// functions depend on the above mentioned choice of the Unix epoch for the
+// Time representation (and both need to be Time friends). Without this
+// knowledge, we would need to add-in/subtract-out UnixEpoch() respectively.
+constexpr Time FromUnixDuration(Duration d) { return Time(d); }
+constexpr Duration ToUnixDuration(Time t) { return t.rep_; }
+
+template <std::intmax_t N>
+constexpr Duration FromInt64(int64_t v, std::ratio<1, N>) {
+ static_assert(0 < N && N <= 1000 * 1000 * 1000, "Unsupported ratio");
+ // Subsecond ratios cannot overflow.
+ return MakeNormalizedDuration(
+ v / N, v % N * kTicksPerNanosecond * 1000 * 1000 * 1000 / N);
+}
+constexpr Duration FromInt64(int64_t v, std::ratio<60>) {
+ return (v <= (std::numeric_limits<int64_t>::max)() / 60 &&
+ v >= (std::numeric_limits<int64_t>::min)() / 60)
+ ? MakeDuration(v * 60)
+ : v > 0 ? InfiniteDuration() : -InfiniteDuration();
+}
+constexpr Duration FromInt64(int64_t v, std::ratio<3600>) {
+ return (v <= (std::numeric_limits<int64_t>::max)() / 3600 &&
+ v >= (std::numeric_limits<int64_t>::min)() / 3600)
+ ? MakeDuration(v * 3600)
+ : v > 0 ? InfiniteDuration() : -InfiniteDuration();
+}
+
+// IsValidRep64<T>(0) is true if the expression `int64_t{std::declval<T>()}` is
+// valid. That is, if a T can be assigned to an int64_t without narrowing.
+template <typename T>
+constexpr auto IsValidRep64(int) -> decltype(int64_t{std::declval<T>()} == 0) {
+ return true;
+}
+template <typename T>
+constexpr auto IsValidRep64(char) -> bool {
+ return false;
+}
+
+// Converts a std::chrono::duration to an absl::Duration.
+template <typename Rep, typename Period>
+constexpr Duration FromChrono(const std::chrono::duration<Rep, Period>& d) {
+ static_assert(IsValidRep64<Rep>(0), "duration::rep is invalid");
+ return FromInt64(int64_t{d.count()}, Period{});
+}
+
+template <typename Ratio>
+int64_t ToInt64(Duration d, Ratio) {
+ // Note: This may be used on MSVC, which may have a system_clock period of
+ // std::ratio<1, 10 * 1000 * 1000>
+ return ToInt64Seconds(d * Ratio::den / Ratio::num);
+}
+// Fastpath implementations for the 6 common duration units.
+inline int64_t ToInt64(Duration d, std::nano) {
+ return ToInt64Nanoseconds(d);
+}
+inline int64_t ToInt64(Duration d, std::micro) {
+ return ToInt64Microseconds(d);
+}
+inline int64_t ToInt64(Duration d, std::milli) {
+ return ToInt64Milliseconds(d);
+}
+inline int64_t ToInt64(Duration d, std::ratio<1>) {
+ return ToInt64Seconds(d);
+}
+inline int64_t ToInt64(Duration d, std::ratio<60>) {
+ return ToInt64Minutes(d);
+}
+inline int64_t ToInt64(Duration d, std::ratio<3600>) {
+ return ToInt64Hours(d);
+}
+
+// Converts an absl::Duration to a chrono duration of type T.
+template <typename T>
+T ToChronoDuration(Duration d) {
+ using Rep = typename T::rep;
+ using Period = typename T::period;
+ static_assert(IsValidRep64<Rep>(0), "duration::rep is invalid");
+ if (time_internal::IsInfiniteDuration(d))
+ return d < ZeroDuration() ? (T::min)() : (T::max)();
+ const auto v = ToInt64(d, Period{});
+ if (v > (std::numeric_limits<Rep>::max)()) return (T::max)();
+ if (v < (std::numeric_limits<Rep>::min)()) return (T::min)();
+ return T{v};
+}
+
+} // namespace time_internal
+
+constexpr Duration Nanoseconds(int64_t n) {
+ return time_internal::FromInt64(n, std::nano{});
+}
+constexpr Duration Microseconds(int64_t n) {
+ return time_internal::FromInt64(n, std::micro{});
+}
+constexpr Duration Milliseconds(int64_t n) {
+ return time_internal::FromInt64(n, std::milli{});
+}
+constexpr Duration Seconds(int64_t n) {
+ return time_internal::FromInt64(n, std::ratio<1>{});
+}
+constexpr Duration Minutes(int64_t n) {
+ return time_internal::FromInt64(n, std::ratio<60>{});
+}
+constexpr Duration Hours(int64_t n) {
+ return time_internal::FromInt64(n, std::ratio<3600>{});
+}
+
+constexpr bool operator<(Duration lhs, Duration rhs) {
+ return time_internal::GetRepHi(lhs) != time_internal::GetRepHi(rhs)
+ ? time_internal::GetRepHi(lhs) < time_internal::GetRepHi(rhs)
+ : time_internal::GetRepHi(lhs) == (std::numeric_limits<int64_t>::min)()
+ ? time_internal::GetRepLo(lhs) + 1 <
+ time_internal::GetRepLo(rhs) + 1
+ : time_internal::GetRepLo(lhs) < time_internal::GetRepLo(rhs);
+}
+
+constexpr bool operator==(Duration lhs, Duration rhs) {
+ return time_internal::GetRepHi(lhs) == time_internal::GetRepHi(rhs) &&
+ time_internal::GetRepLo(lhs) == time_internal::GetRepLo(rhs);
+}
+
+constexpr Duration operator-(Duration d) {
+ // This is a little interesting because of the special cases.
+ //
+ // If rep_lo_ is zero, we have it easy; it's safe to negate rep_hi_, we're
+ // dealing with an integral number of seconds, and the only special case is
+ // the maximum negative finite duration, which can't be negated.
+ //
+ // Infinities stay infinite, and just change direction.
+ //
+ // Finally we're in the case where rep_lo_ is non-zero, and we can borrow
+ // a second's worth of ticks and avoid overflow (as negating int64_t-min + 1
+ // is safe).
+ return time_internal::GetRepLo(d) == 0
+ ? time_internal::GetRepHi(d) ==
+ (std::numeric_limits<int64_t>::min)()
+ ? InfiniteDuration()
+ : time_internal::MakeDuration(-time_internal::GetRepHi(d))
+ : time_internal::IsInfiniteDuration(d)
+ ? time_internal::OppositeInfinity(d)
+ : time_internal::MakeDuration(
+ time_internal::NegateAndSubtractOne(
+ time_internal::GetRepHi(d)),
+ time_internal::kTicksPerSecond -
+ time_internal::GetRepLo(d));
+}
+
+constexpr Duration InfiniteDuration() {
+ return time_internal::MakeDuration((std::numeric_limits<int64_t>::max)(),
+ ~0U);
+}
+
+constexpr Duration FromChrono(const std::chrono::nanoseconds& d) {
+ return time_internal::FromChrono(d);
+}
+constexpr Duration FromChrono(const std::chrono::microseconds& d) {
+ return time_internal::FromChrono(d);
+}
+constexpr Duration FromChrono(const std::chrono::milliseconds& d) {
+ return time_internal::FromChrono(d);
+}
+constexpr Duration FromChrono(const std::chrono::seconds& d) {
+ return time_internal::FromChrono(d);
+}
+constexpr Duration FromChrono(const std::chrono::minutes& d) {
+ return time_internal::FromChrono(d);
+}
+constexpr Duration FromChrono(const std::chrono::hours& d) {
+ return time_internal::FromChrono(d);
+}
+
+constexpr Time FromUnixNanos(int64_t ns) {
+ return time_internal::FromUnixDuration(Nanoseconds(ns));
+}
+
+constexpr Time FromUnixMicros(int64_t us) {
+ return time_internal::FromUnixDuration(Microseconds(us));
+}
+
+constexpr Time FromUnixMillis(int64_t ms) {
+ return time_internal::FromUnixDuration(Milliseconds(ms));
+}
+
+constexpr Time FromUnixSeconds(int64_t s) {
+ return time_internal::FromUnixDuration(Seconds(s));
+}
+
+constexpr Time FromTimeT(time_t t) {
+ return time_internal::FromUnixDuration(Seconds(t));
+}
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_TIME_TIME_H_
diff --git a/third_party/abseil/src/absl/time/time_benchmark.cc b/third_party/abseil/src/absl/time/time_benchmark.cc
new file mode 100644
index 0000000..99e6279
--- /dev/null
+++ b/third_party/abseil/src/absl/time/time_benchmark.cc
@@ -0,0 +1,316 @@
+// Copyright 2018 The Abseil Authors.
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/time/time.h"
+
+#if !defined(_WIN32)
+#include <sys/time.h>
+#endif // _WIN32
+#include <algorithm>
+#include <cmath>
+#include <cstddef>
+#include <cstring>
+#include <ctime>
+#include <memory>
+#include <string>
+
+#include "absl/time/clock.h"
+#include "absl/time/internal/test_util.h"
+#include "benchmark/benchmark.h"
+
+namespace {
+
+//
+// Addition/Subtraction of a duration
+//
+
+void BM_Time_Arithmetic(benchmark::State& state) {
+ const absl::Duration nano = absl::Nanoseconds(1);
+ const absl::Duration sec = absl::Seconds(1);
+ absl::Time t = absl::UnixEpoch();
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(t += nano);
+ benchmark::DoNotOptimize(t -= sec);
+ }
+}
+BENCHMARK(BM_Time_Arithmetic);
+
+//
+// Time difference
+//
+
+void BM_Time_Difference(benchmark::State& state) {
+ absl::Time start = absl::Now();
+ absl::Time end = start + absl::Nanoseconds(1);
+ absl::Duration diff;
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(diff += end - start);
+ }
+}
+BENCHMARK(BM_Time_Difference);
+
+//
+// ToDateTime
+//
+// In each "ToDateTime" benchmark we switch between two instants
+// separated by at least one transition in order to defeat any
+// internal caching of previous results (e.g., see local_time_hint_).
+//
+// The "UTC" variants use UTC instead of the Google/local time zone.
+//
+
+void BM_Time_ToDateTime_Absl(benchmark::State& state) {
+ const absl::TimeZone tz =
+ absl::time_internal::LoadTimeZone("America/Los_Angeles");
+ absl::Time t = absl::FromUnixSeconds(1384569027);
+ absl::Time t2 = absl::FromUnixSeconds(1418962578);
+ while (state.KeepRunning()) {
+ std::swap(t, t2);
+ t += absl::Seconds(1);
+ benchmark::DoNotOptimize(t.In(tz));
+ }
+}
+BENCHMARK(BM_Time_ToDateTime_Absl);
+
+void BM_Time_ToDateTime_Libc(benchmark::State& state) {
+ // No timezone support, so just use localtime.
+ time_t t = 1384569027;
+ time_t t2 = 1418962578;
+ while (state.KeepRunning()) {
+ std::swap(t, t2);
+ t += 1;
+ struct tm tm;
+#if !defined(_WIN32)
+ benchmark::DoNotOptimize(localtime_r(&t, &tm));
+#else // _WIN32
+ benchmark::DoNotOptimize(localtime_s(&tm, &t));
+#endif // _WIN32
+ }
+}
+BENCHMARK(BM_Time_ToDateTime_Libc);
+
+void BM_Time_ToDateTimeUTC_Absl(benchmark::State& state) {
+ const absl::TimeZone tz = absl::UTCTimeZone();
+ absl::Time t = absl::FromUnixSeconds(1384569027);
+ while (state.KeepRunning()) {
+ t += absl::Seconds(1);
+ benchmark::DoNotOptimize(t.In(tz));
+ }
+}
+BENCHMARK(BM_Time_ToDateTimeUTC_Absl);
+
+void BM_Time_ToDateTimeUTC_Libc(benchmark::State& state) {
+ time_t t = 1384569027;
+ while (state.KeepRunning()) {
+ t += 1;
+ struct tm tm;
+#if !defined(_WIN32)
+ benchmark::DoNotOptimize(gmtime_r(&t, &tm));
+#else // _WIN32
+ benchmark::DoNotOptimize(gmtime_s(&tm, &t));
+#endif // _WIN32
+ }
+}
+BENCHMARK(BM_Time_ToDateTimeUTC_Libc);
+
+//
+// FromUnixMicros
+//
+
+void BM_Time_FromUnixMicros(benchmark::State& state) {
+ int i = 0;
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(absl::FromUnixMicros(i));
+ ++i;
+ }
+}
+BENCHMARK(BM_Time_FromUnixMicros);
+
+void BM_Time_ToUnixNanos(benchmark::State& state) {
+ const absl::Time t = absl::UnixEpoch() + absl::Seconds(123);
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(ToUnixNanos(t));
+ }
+}
+BENCHMARK(BM_Time_ToUnixNanos);
+
+void BM_Time_ToUnixMicros(benchmark::State& state) {
+ const absl::Time t = absl::UnixEpoch() + absl::Seconds(123);
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(ToUnixMicros(t));
+ }
+}
+BENCHMARK(BM_Time_ToUnixMicros);
+
+void BM_Time_ToUnixMillis(benchmark::State& state) {
+ const absl::Time t = absl::UnixEpoch() + absl::Seconds(123);
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(ToUnixMillis(t));
+ }
+}
+BENCHMARK(BM_Time_ToUnixMillis);
+
+void BM_Time_ToUnixSeconds(benchmark::State& state) {
+ const absl::Time t = absl::UnixEpoch() + absl::Seconds(123);
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(absl::ToUnixSeconds(t));
+ }
+}
+BENCHMARK(BM_Time_ToUnixSeconds);
+
+//
+// FromCivil
+//
+// In each "FromCivil" benchmark we switch between two YMDhms values
+// separated by at least one transition in order to defeat any internal
+// caching of previous results (e.g., see time_local_hint_).
+//
+// The "UTC" variants use UTC instead of the Google/local time zone.
+// The "Day0" variants require normalization of the day of month.
+//
+
+void BM_Time_FromCivil_Absl(benchmark::State& state) {
+ const absl::TimeZone tz =
+ absl::time_internal::LoadTimeZone("America/Los_Angeles");
+ int i = 0;
+ while (state.KeepRunning()) {
+ if ((i & 1) == 0) {
+ absl::FromCivil(absl::CivilSecond(2014, 12, 18, 20, 16, 18), tz);
+ } else {
+ absl::FromCivil(absl::CivilSecond(2013, 11, 15, 18, 30, 27), tz);
+ }
+ ++i;
+ }
+}
+BENCHMARK(BM_Time_FromCivil_Absl);
+
+void BM_Time_FromCivil_Libc(benchmark::State& state) {
+ // No timezone support, so just use localtime.
+ int i = 0;
+ while (state.KeepRunning()) {
+ struct tm tm;
+ if ((i & 1) == 0) {
+ tm.tm_year = 2014 - 1900;
+ tm.tm_mon = 12 - 1;
+ tm.tm_mday = 18;
+ tm.tm_hour = 20;
+ tm.tm_min = 16;
+ tm.tm_sec = 18;
+ } else {
+ tm.tm_year = 2013 - 1900;
+ tm.tm_mon = 11 - 1;
+ tm.tm_mday = 15;
+ tm.tm_hour = 18;
+ tm.tm_min = 30;
+ tm.tm_sec = 27;
+ }
+ tm.tm_isdst = -1;
+ mktime(&tm);
+ ++i;
+ }
+}
+BENCHMARK(BM_Time_FromCivil_Libc);
+
+void BM_Time_FromCivilUTC_Absl(benchmark::State& state) {
+ const absl::TimeZone tz = absl::UTCTimeZone();
+ while (state.KeepRunning()) {
+ absl::FromCivil(absl::CivilSecond(2014, 12, 18, 20, 16, 18), tz);
+ }
+}
+BENCHMARK(BM_Time_FromCivilUTC_Absl);
+
+void BM_Time_FromCivilDay0_Absl(benchmark::State& state) {
+ const absl::TimeZone tz =
+ absl::time_internal::LoadTimeZone("America/Los_Angeles");
+ int i = 0;
+ while (state.KeepRunning()) {
+ if ((i & 1) == 0) {
+ absl::FromCivil(absl::CivilSecond(2014, 12, 0, 20, 16, 18), tz);
+ } else {
+ absl::FromCivil(absl::CivilSecond(2013, 11, 0, 18, 30, 27), tz);
+ }
+ ++i;
+ }
+}
+BENCHMARK(BM_Time_FromCivilDay0_Absl);
+
+void BM_Time_FromCivilDay0_Libc(benchmark::State& state) {
+ // No timezone support, so just use localtime.
+ int i = 0;
+ while (state.KeepRunning()) {
+ struct tm tm;
+ if ((i & 1) == 0) {
+ tm.tm_year = 2014 - 1900;
+ tm.tm_mon = 12 - 1;
+ tm.tm_mday = 0;
+ tm.tm_hour = 20;
+ tm.tm_min = 16;
+ tm.tm_sec = 18;
+ } else {
+ tm.tm_year = 2013 - 1900;
+ tm.tm_mon = 11 - 1;
+ tm.tm_mday = 0;
+ tm.tm_hour = 18;
+ tm.tm_min = 30;
+ tm.tm_sec = 27;
+ }
+ tm.tm_isdst = -1;
+ mktime(&tm);
+ ++i;
+ }
+}
+BENCHMARK(BM_Time_FromCivilDay0_Libc);
+
+//
+// To/FromTimespec
+//
+
+void BM_Time_ToTimespec(benchmark::State& state) {
+ absl::Time now = absl::Now();
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(absl::ToTimespec(now));
+ }
+}
+BENCHMARK(BM_Time_ToTimespec);
+
+void BM_Time_FromTimespec(benchmark::State& state) {
+ timespec ts = absl::ToTimespec(absl::Now());
+ while (state.KeepRunning()) {
+ if (++ts.tv_nsec == 1000 * 1000 * 1000) {
+ ++ts.tv_sec;
+ ts.tv_nsec = 0;
+ }
+ benchmark::DoNotOptimize(absl::TimeFromTimespec(ts));
+ }
+}
+BENCHMARK(BM_Time_FromTimespec);
+
+//
+// Comparison with InfiniteFuture/Past
+//
+
+void BM_Time_InfiniteFuture(benchmark::State& state) {
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(absl::InfiniteFuture());
+ }
+}
+BENCHMARK(BM_Time_InfiniteFuture);
+
+void BM_Time_InfinitePast(benchmark::State& state) {
+ while (state.KeepRunning()) {
+ benchmark::DoNotOptimize(absl::InfinitePast());
+ }
+}
+BENCHMARK(BM_Time_InfinitePast);
+
+} // namespace
diff --git a/third_party/abseil/src/absl/time/time_test.cc b/third_party/abseil/src/absl/time/time_test.cc
new file mode 100644
index 0000000..cde9423
--- /dev/null
+++ b/third_party/abseil/src/absl/time/time_test.cc
@@ -0,0 +1,1280 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/time/time.h"
+
+#if defined(_MSC_VER)
+#include <winsock2.h> // for timeval
+#endif
+
+#include <chrono> // NOLINT(build/c++11)
+#include <cstring>
+#include <ctime>
+#include <iomanip>
+#include <limits>
+#include <string>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/numeric/int128.h"
+#include "absl/time/clock.h"
+#include "absl/time/internal/test_util.h"
+
+namespace {
+
+#if defined(GTEST_USES_SIMPLE_RE) && GTEST_USES_SIMPLE_RE
+const char kZoneAbbrRE[] = ".*"; // just punt
+#else
+const char kZoneAbbrRE[] = "[A-Za-z]{3,4}|[-+][0-9]{2}([0-9]{2})?";
+#endif
+
+// This helper is a macro so that failed expectations show up with the
+// correct line numbers.
+#define EXPECT_CIVIL_INFO(ci, y, m, d, h, min, s, off, isdst) \
+ do { \
+ EXPECT_EQ(y, ci.cs.year()); \
+ EXPECT_EQ(m, ci.cs.month()); \
+ EXPECT_EQ(d, ci.cs.day()); \
+ EXPECT_EQ(h, ci.cs.hour()); \
+ EXPECT_EQ(min, ci.cs.minute()); \
+ EXPECT_EQ(s, ci.cs.second()); \
+ EXPECT_EQ(off, ci.offset); \
+ EXPECT_EQ(isdst, ci.is_dst); \
+ EXPECT_THAT(ci.zone_abbr, testing::MatchesRegex(kZoneAbbrRE)); \
+ } while (0)
+
+// A gMock matcher to match timespec values. Use this matcher like:
+// timespec ts1, ts2;
+// EXPECT_THAT(ts1, TimespecMatcher(ts2));
+MATCHER_P(TimespecMatcher, ts, "") {
+ if (ts.tv_sec == arg.tv_sec && ts.tv_nsec == arg.tv_nsec) return true;
+ *result_listener << "expected: {" << ts.tv_sec << ", " << ts.tv_nsec << "} ";
+ *result_listener << "actual: {" << arg.tv_sec << ", " << arg.tv_nsec << "}";
+ return false;
+}
+
+// A gMock matcher to match timeval values. Use this matcher like:
+// timeval tv1, tv2;
+// EXPECT_THAT(tv1, TimevalMatcher(tv2));
+MATCHER_P(TimevalMatcher, tv, "") {
+ if (tv.tv_sec == arg.tv_sec && tv.tv_usec == arg.tv_usec) return true;
+ *result_listener << "expected: {" << tv.tv_sec << ", " << tv.tv_usec << "} ";
+ *result_listener << "actual: {" << arg.tv_sec << ", " << arg.tv_usec << "}";
+ return false;
+}
+
+TEST(Time, ConstExpr) {
+ constexpr absl::Time t0 = absl::UnixEpoch();
+ static_assert(t0 == absl::Time(), "UnixEpoch");
+ constexpr absl::Time t1 = absl::InfiniteFuture();
+ static_assert(t1 != absl::Time(), "InfiniteFuture");
+ constexpr absl::Time t2 = absl::InfinitePast();
+ static_assert(t2 != absl::Time(), "InfinitePast");
+ constexpr absl::Time t3 = absl::FromUnixNanos(0);
+ static_assert(t3 == absl::Time(), "FromUnixNanos");
+ constexpr absl::Time t4 = absl::FromUnixMicros(0);
+ static_assert(t4 == absl::Time(), "FromUnixMicros");
+ constexpr absl::Time t5 = absl::FromUnixMillis(0);
+ static_assert(t5 == absl::Time(), "FromUnixMillis");
+ constexpr absl::Time t6 = absl::FromUnixSeconds(0);
+ static_assert(t6 == absl::Time(), "FromUnixSeconds");
+ constexpr absl::Time t7 = absl::FromTimeT(0);
+ static_assert(t7 == absl::Time(), "FromTimeT");
+}
+
+TEST(Time, ValueSemantics) {
+ absl::Time a; // Default construction
+ absl::Time b = a; // Copy construction
+ EXPECT_EQ(a, b);
+ absl::Time c(a); // Copy construction (again)
+ EXPECT_EQ(a, b);
+ EXPECT_EQ(a, c);
+ EXPECT_EQ(b, c);
+ b = c; // Assignment
+ EXPECT_EQ(a, b);
+ EXPECT_EQ(a, c);
+ EXPECT_EQ(b, c);
+}
+
+TEST(Time, UnixEpoch) {
+ const auto ci = absl::UTCTimeZone().At(absl::UnixEpoch());
+ EXPECT_EQ(absl::CivilSecond(1970, 1, 1, 0, 0, 0), ci.cs);
+ EXPECT_EQ(absl::ZeroDuration(), ci.subsecond);
+ EXPECT_EQ(absl::Weekday::thursday, absl::GetWeekday(ci.cs));
+}
+
+TEST(Time, Breakdown) {
+ absl::TimeZone tz = absl::time_internal::LoadTimeZone("America/New_York");
+ absl::Time t = absl::UnixEpoch();
+
+ // The Unix epoch as seen in NYC.
+ auto ci = tz.At(t);
+ EXPECT_CIVIL_INFO(ci, 1969, 12, 31, 19, 0, 0, -18000, false);
+ EXPECT_EQ(absl::ZeroDuration(), ci.subsecond);
+ EXPECT_EQ(absl::Weekday::wednesday, absl::GetWeekday(ci.cs));
+
+ // Just before the epoch.
+ t -= absl::Nanoseconds(1);
+ ci = tz.At(t);
+ EXPECT_CIVIL_INFO(ci, 1969, 12, 31, 18, 59, 59, -18000, false);
+ EXPECT_EQ(absl::Nanoseconds(999999999), ci.subsecond);
+ EXPECT_EQ(absl::Weekday::wednesday, absl::GetWeekday(ci.cs));
+
+ // Some time later.
+ t += absl::Hours(24) * 2735;
+ t += absl::Hours(18) + absl::Minutes(30) + absl::Seconds(15) +
+ absl::Nanoseconds(9);
+ ci = tz.At(t);
+ EXPECT_CIVIL_INFO(ci, 1977, 6, 28, 14, 30, 15, -14400, true);
+ EXPECT_EQ(8, ci.subsecond / absl::Nanoseconds(1));
+ EXPECT_EQ(absl::Weekday::tuesday, absl::GetWeekday(ci.cs));
+}
+
+TEST(Time, AdditiveOperators) {
+ const absl::Duration d = absl::Nanoseconds(1);
+ const absl::Time t0;
+ const absl::Time t1 = t0 + d;
+
+ EXPECT_EQ(d, t1 - t0);
+ EXPECT_EQ(-d, t0 - t1);
+ EXPECT_EQ(t0, t1 - d);
+
+ absl::Time t(t0);
+ EXPECT_EQ(t0, t);
+ t += d;
+ EXPECT_EQ(t0 + d, t);
+ EXPECT_EQ(d, t - t0);
+ t -= d;
+ EXPECT_EQ(t0, t);
+
+ // Tests overflow between subseconds and seconds.
+ t = absl::UnixEpoch();
+ t += absl::Milliseconds(500);
+ EXPECT_EQ(absl::UnixEpoch() + absl::Milliseconds(500), t);
+ t += absl::Milliseconds(600);
+ EXPECT_EQ(absl::UnixEpoch() + absl::Milliseconds(1100), t);
+ t -= absl::Milliseconds(600);
+ EXPECT_EQ(absl::UnixEpoch() + absl::Milliseconds(500), t);
+ t -= absl::Milliseconds(500);
+ EXPECT_EQ(absl::UnixEpoch(), t);
+}
+
+TEST(Time, RelationalOperators) {
+ constexpr absl::Time t1 = absl::FromUnixNanos(0);
+ constexpr absl::Time t2 = absl::FromUnixNanos(1);
+ constexpr absl::Time t3 = absl::FromUnixNanos(2);
+
+ static_assert(absl::Time() == t1, "");
+ static_assert(t1 == t1, "");
+ static_assert(t2 == t2, "");
+ static_assert(t3 == t3, "");
+
+ static_assert(t1 < t2, "");
+ static_assert(t2 < t3, "");
+ static_assert(t1 < t3, "");
+
+ static_assert(t1 <= t1, "");
+ static_assert(t1 <= t2, "");
+ static_assert(t2 <= t2, "");
+ static_assert(t2 <= t3, "");
+ static_assert(t3 <= t3, "");
+ static_assert(t1 <= t3, "");
+
+ static_assert(t2 > t1, "");
+ static_assert(t3 > t2, "");
+ static_assert(t3 > t1, "");
+
+ static_assert(t2 >= t2, "");
+ static_assert(t2 >= t1, "");
+ static_assert(t3 >= t3, "");
+ static_assert(t3 >= t2, "");
+ static_assert(t1 >= t1, "");
+ static_assert(t3 >= t1, "");
+}
+
+TEST(Time, Infinity) {
+ constexpr absl::Time ifuture = absl::InfiniteFuture();
+ constexpr absl::Time ipast = absl::InfinitePast();
+
+ static_assert(ifuture == ifuture, "");
+ static_assert(ipast == ipast, "");
+ static_assert(ipast < ifuture, "");
+ static_assert(ifuture > ipast, "");
+
+ // Arithmetic saturates
+ EXPECT_EQ(ifuture, ifuture + absl::Seconds(1));
+ EXPECT_EQ(ifuture, ifuture - absl::Seconds(1));
+ EXPECT_EQ(ipast, ipast + absl::Seconds(1));
+ EXPECT_EQ(ipast, ipast - absl::Seconds(1));
+
+ EXPECT_EQ(absl::InfiniteDuration(), ifuture - ifuture);
+ EXPECT_EQ(absl::InfiniteDuration(), ifuture - ipast);
+ EXPECT_EQ(-absl::InfiniteDuration(), ipast - ifuture);
+ EXPECT_EQ(-absl::InfiniteDuration(), ipast - ipast);
+
+ constexpr absl::Time t = absl::UnixEpoch(); // Any finite time.
+ static_assert(t < ifuture, "");
+ static_assert(t > ipast, "");
+
+ EXPECT_EQ(ifuture, t + absl::InfiniteDuration());
+ EXPECT_EQ(ipast, t - absl::InfiniteDuration());
+}
+
+TEST(Time, FloorConversion) {
+#define TEST_FLOOR_CONVERSION(TO, FROM) \
+ EXPECT_EQ(1, TO(FROM(1001))); \
+ EXPECT_EQ(1, TO(FROM(1000))); \
+ EXPECT_EQ(0, TO(FROM(999))); \
+ EXPECT_EQ(0, TO(FROM(1))); \
+ EXPECT_EQ(0, TO(FROM(0))); \
+ EXPECT_EQ(-1, TO(FROM(-1))); \
+ EXPECT_EQ(-1, TO(FROM(-999))); \
+ EXPECT_EQ(-1, TO(FROM(-1000))); \
+ EXPECT_EQ(-2, TO(FROM(-1001)));
+
+ TEST_FLOOR_CONVERSION(absl::ToUnixMicros, absl::FromUnixNanos);
+ TEST_FLOOR_CONVERSION(absl::ToUnixMillis, absl::FromUnixMicros);
+ TEST_FLOOR_CONVERSION(absl::ToUnixSeconds, absl::FromUnixMillis);
+ TEST_FLOOR_CONVERSION(absl::ToTimeT, absl::FromUnixMillis);
+
+#undef TEST_FLOOR_CONVERSION
+
+ // Tests ToUnixNanos.
+ EXPECT_EQ(1, absl::ToUnixNanos(absl::UnixEpoch() + absl::Nanoseconds(3) / 2));
+ EXPECT_EQ(1, absl::ToUnixNanos(absl::UnixEpoch() + absl::Nanoseconds(1)));
+ EXPECT_EQ(0, absl::ToUnixNanos(absl::UnixEpoch() + absl::Nanoseconds(1) / 2));
+ EXPECT_EQ(0, absl::ToUnixNanos(absl::UnixEpoch() + absl::Nanoseconds(0)));
+ EXPECT_EQ(-1,
+ absl::ToUnixNanos(absl::UnixEpoch() - absl::Nanoseconds(1) / 2));
+ EXPECT_EQ(-1, absl::ToUnixNanos(absl::UnixEpoch() - absl::Nanoseconds(1)));
+ EXPECT_EQ(-2,
+ absl::ToUnixNanos(absl::UnixEpoch() - absl::Nanoseconds(3) / 2));
+
+ // Tests ToUniversal, which uses a different epoch than the tests above.
+ EXPECT_EQ(1,
+ absl::ToUniversal(absl::UniversalEpoch() + absl::Nanoseconds(101)));
+ EXPECT_EQ(1,
+ absl::ToUniversal(absl::UniversalEpoch() + absl::Nanoseconds(100)));
+ EXPECT_EQ(0,
+ absl::ToUniversal(absl::UniversalEpoch() + absl::Nanoseconds(99)));
+ EXPECT_EQ(0,
+ absl::ToUniversal(absl::UniversalEpoch() + absl::Nanoseconds(1)));
+ EXPECT_EQ(0,
+ absl::ToUniversal(absl::UniversalEpoch() + absl::Nanoseconds(0)));
+ EXPECT_EQ(-1,
+ absl::ToUniversal(absl::UniversalEpoch() + absl::Nanoseconds(-1)));
+ EXPECT_EQ(-1,
+ absl::ToUniversal(absl::UniversalEpoch() + absl::Nanoseconds(-99)));
+ EXPECT_EQ(
+ -1, absl::ToUniversal(absl::UniversalEpoch() + absl::Nanoseconds(-100)));
+ EXPECT_EQ(
+ -2, absl::ToUniversal(absl::UniversalEpoch() + absl::Nanoseconds(-101)));
+
+ // Tests ToTimespec()/TimeFromTimespec()
+ const struct {
+ absl::Time t;
+ timespec ts;
+ } to_ts[] = {
+ {absl::FromUnixSeconds(1) + absl::Nanoseconds(1), {1, 1}},
+ {absl::FromUnixSeconds(1) + absl::Nanoseconds(1) / 2, {1, 0}},
+ {absl::FromUnixSeconds(1) + absl::Nanoseconds(0), {1, 0}},
+ {absl::FromUnixSeconds(0) + absl::Nanoseconds(0), {0, 0}},
+ {absl::FromUnixSeconds(0) - absl::Nanoseconds(1) / 2, {-1, 999999999}},
+ {absl::FromUnixSeconds(0) - absl::Nanoseconds(1), {-1, 999999999}},
+ {absl::FromUnixSeconds(-1) + absl::Nanoseconds(1), {-1, 1}},
+ {absl::FromUnixSeconds(-1) + absl::Nanoseconds(1) / 2, {-1, 0}},
+ {absl::FromUnixSeconds(-1) + absl::Nanoseconds(0), {-1, 0}},
+ {absl::FromUnixSeconds(-1) - absl::Nanoseconds(1) / 2, {-2, 999999999}},
+ };
+ for (const auto& test : to_ts) {
+ EXPECT_THAT(absl::ToTimespec(test.t), TimespecMatcher(test.ts));
+ }
+ const struct {
+ timespec ts;
+ absl::Time t;
+ } from_ts[] = {
+ {{1, 1}, absl::FromUnixSeconds(1) + absl::Nanoseconds(1)},
+ {{1, 0}, absl::FromUnixSeconds(1) + absl::Nanoseconds(0)},
+ {{0, 0}, absl::FromUnixSeconds(0) + absl::Nanoseconds(0)},
+ {{0, -1}, absl::FromUnixSeconds(0) - absl::Nanoseconds(1)},
+ {{-1, 999999999}, absl::FromUnixSeconds(0) - absl::Nanoseconds(1)},
+ {{-1, 1}, absl::FromUnixSeconds(-1) + absl::Nanoseconds(1)},
+ {{-1, 0}, absl::FromUnixSeconds(-1) + absl::Nanoseconds(0)},
+ {{-1, -1}, absl::FromUnixSeconds(-1) - absl::Nanoseconds(1)},
+ {{-2, 999999999}, absl::FromUnixSeconds(-1) - absl::Nanoseconds(1)},
+ };
+ for (const auto& test : from_ts) {
+ EXPECT_EQ(test.t, absl::TimeFromTimespec(test.ts));
+ }
+
+ // Tests ToTimeval()/TimeFromTimeval() (same as timespec above)
+ const struct {
+ absl::Time t;
+ timeval tv;
+ } to_tv[] = {
+ {absl::FromUnixSeconds(1) + absl::Microseconds(1), {1, 1}},
+ {absl::FromUnixSeconds(1) + absl::Microseconds(1) / 2, {1, 0}},
+ {absl::FromUnixSeconds(1) + absl::Microseconds(0), {1, 0}},
+ {absl::FromUnixSeconds(0) + absl::Microseconds(0), {0, 0}},
+ {absl::FromUnixSeconds(0) - absl::Microseconds(1) / 2, {-1, 999999}},
+ {absl::FromUnixSeconds(0) - absl::Microseconds(1), {-1, 999999}},
+ {absl::FromUnixSeconds(-1) + absl::Microseconds(1), {-1, 1}},
+ {absl::FromUnixSeconds(-1) + absl::Microseconds(1) / 2, {-1, 0}},
+ {absl::FromUnixSeconds(-1) + absl::Microseconds(0), {-1, 0}},
+ {absl::FromUnixSeconds(-1) - absl::Microseconds(1) / 2, {-2, 999999}},
+ };
+ for (const auto& test : to_tv) {
+ EXPECT_THAT(ToTimeval(test.t), TimevalMatcher(test.tv));
+ }
+ const struct {
+ timeval tv;
+ absl::Time t;
+ } from_tv[] = {
+ {{1, 1}, absl::FromUnixSeconds(1) + absl::Microseconds(1)},
+ {{1, 0}, absl::FromUnixSeconds(1) + absl::Microseconds(0)},
+ {{0, 0}, absl::FromUnixSeconds(0) + absl::Microseconds(0)},
+ {{0, -1}, absl::FromUnixSeconds(0) - absl::Microseconds(1)},
+ {{-1, 999999}, absl::FromUnixSeconds(0) - absl::Microseconds(1)},
+ {{-1, 1}, absl::FromUnixSeconds(-1) + absl::Microseconds(1)},
+ {{-1, 0}, absl::FromUnixSeconds(-1) + absl::Microseconds(0)},
+ {{-1, -1}, absl::FromUnixSeconds(-1) - absl::Microseconds(1)},
+ {{-2, 999999}, absl::FromUnixSeconds(-1) - absl::Microseconds(1)},
+ };
+ for (const auto& test : from_tv) {
+ EXPECT_EQ(test.t, absl::TimeFromTimeval(test.tv));
+ }
+
+ // Tests flooring near negative infinity.
+ const int64_t min_plus_1 = std::numeric_limits<int64_t>::min() + 1;
+ EXPECT_EQ(min_plus_1, absl::ToUnixSeconds(absl::FromUnixSeconds(min_plus_1)));
+ EXPECT_EQ(std::numeric_limits<int64_t>::min(),
+ absl::ToUnixSeconds(absl::FromUnixSeconds(min_plus_1) -
+ absl::Nanoseconds(1) / 2));
+
+ // Tests flooring near positive infinity.
+ EXPECT_EQ(std::numeric_limits<int64_t>::max(),
+ absl::ToUnixSeconds(
+ absl::FromUnixSeconds(std::numeric_limits<int64_t>::max()) +
+ absl::Nanoseconds(1) / 2));
+ EXPECT_EQ(std::numeric_limits<int64_t>::max(),
+ absl::ToUnixSeconds(
+ absl::FromUnixSeconds(std::numeric_limits<int64_t>::max())));
+ EXPECT_EQ(std::numeric_limits<int64_t>::max() - 1,
+ absl::ToUnixSeconds(
+ absl::FromUnixSeconds(std::numeric_limits<int64_t>::max()) -
+ absl::Nanoseconds(1) / 2));
+}
+
+TEST(Time, RoundtripConversion) {
+#define TEST_CONVERSION_ROUND_TRIP(SOURCE, FROM, TO, MATCHER) \
+ EXPECT_THAT(TO(FROM(SOURCE)), MATCHER(SOURCE))
+
+ // FromUnixNanos() and ToUnixNanos()
+ int64_t now_ns = absl::GetCurrentTimeNanos();
+ TEST_CONVERSION_ROUND_TRIP(-1, absl::FromUnixNanos, absl::ToUnixNanos,
+ testing::Eq);
+ TEST_CONVERSION_ROUND_TRIP(0, absl::FromUnixNanos, absl::ToUnixNanos,
+ testing::Eq);
+ TEST_CONVERSION_ROUND_TRIP(1, absl::FromUnixNanos, absl::ToUnixNanos,
+ testing::Eq);
+ TEST_CONVERSION_ROUND_TRIP(now_ns, absl::FromUnixNanos, absl::ToUnixNanos,
+ testing::Eq)
+ << now_ns;
+
+ // FromUnixMicros() and ToUnixMicros()
+ int64_t now_us = absl::GetCurrentTimeNanos() / 1000;
+ TEST_CONVERSION_ROUND_TRIP(-1, absl::FromUnixMicros, absl::ToUnixMicros,
+ testing::Eq);
+ TEST_CONVERSION_ROUND_TRIP(0, absl::FromUnixMicros, absl::ToUnixMicros,
+ testing::Eq);
+ TEST_CONVERSION_ROUND_TRIP(1, absl::FromUnixMicros, absl::ToUnixMicros,
+ testing::Eq);
+ TEST_CONVERSION_ROUND_TRIP(now_us, absl::FromUnixMicros, absl::ToUnixMicros,
+ testing::Eq)
+ << now_us;
+
+ // FromUnixMillis() and ToUnixMillis()
+ int64_t now_ms = absl::GetCurrentTimeNanos() / 1000000;
+ TEST_CONVERSION_ROUND_TRIP(-1, absl::FromUnixMillis, absl::ToUnixMillis,
+ testing::Eq);
+ TEST_CONVERSION_ROUND_TRIP(0, absl::FromUnixMillis, absl::ToUnixMillis,
+ testing::Eq);
+ TEST_CONVERSION_ROUND_TRIP(1, absl::FromUnixMillis, absl::ToUnixMillis,
+ testing::Eq);
+ TEST_CONVERSION_ROUND_TRIP(now_ms, absl::FromUnixMillis, absl::ToUnixMillis,
+ testing::Eq)
+ << now_ms;
+
+ // FromUnixSeconds() and ToUnixSeconds()
+ int64_t now_s = std::time(nullptr);
+ TEST_CONVERSION_ROUND_TRIP(-1, absl::FromUnixSeconds, absl::ToUnixSeconds,
+ testing::Eq);
+ TEST_CONVERSION_ROUND_TRIP(0, absl::FromUnixSeconds, absl::ToUnixSeconds,
+ testing::Eq);
+ TEST_CONVERSION_ROUND_TRIP(1, absl::FromUnixSeconds, absl::ToUnixSeconds,
+ testing::Eq);
+ TEST_CONVERSION_ROUND_TRIP(now_s, absl::FromUnixSeconds, absl::ToUnixSeconds,
+ testing::Eq)
+ << now_s;
+
+ // FromTimeT() and ToTimeT()
+ time_t now_time_t = std::time(nullptr);
+ TEST_CONVERSION_ROUND_TRIP(-1, absl::FromTimeT, absl::ToTimeT, testing::Eq);
+ TEST_CONVERSION_ROUND_TRIP(0, absl::FromTimeT, absl::ToTimeT, testing::Eq);
+ TEST_CONVERSION_ROUND_TRIP(1, absl::FromTimeT, absl::ToTimeT, testing::Eq);
+ TEST_CONVERSION_ROUND_TRIP(now_time_t, absl::FromTimeT, absl::ToTimeT,
+ testing::Eq)
+ << now_time_t;
+
+ // TimeFromTimeval() and ToTimeval()
+ timeval tv;
+ tv.tv_sec = -1;
+ tv.tv_usec = 0;
+ TEST_CONVERSION_ROUND_TRIP(tv, absl::TimeFromTimeval, absl::ToTimeval,
+ TimevalMatcher);
+ tv.tv_sec = -1;
+ tv.tv_usec = 999999;
+ TEST_CONVERSION_ROUND_TRIP(tv, absl::TimeFromTimeval, absl::ToTimeval,
+ TimevalMatcher);
+ tv.tv_sec = 0;
+ tv.tv_usec = 0;
+ TEST_CONVERSION_ROUND_TRIP(tv, absl::TimeFromTimeval, absl::ToTimeval,
+ TimevalMatcher);
+ tv.tv_sec = 0;
+ tv.tv_usec = 1;
+ TEST_CONVERSION_ROUND_TRIP(tv, absl::TimeFromTimeval, absl::ToTimeval,
+ TimevalMatcher);
+ tv.tv_sec = 1;
+ tv.tv_usec = 0;
+ TEST_CONVERSION_ROUND_TRIP(tv, absl::TimeFromTimeval, absl::ToTimeval,
+ TimevalMatcher);
+
+ // TimeFromTimespec() and ToTimespec()
+ timespec ts;
+ ts.tv_sec = -1;
+ ts.tv_nsec = 0;
+ TEST_CONVERSION_ROUND_TRIP(ts, absl::TimeFromTimespec, absl::ToTimespec,
+ TimespecMatcher);
+ ts.tv_sec = -1;
+ ts.tv_nsec = 999999999;
+ TEST_CONVERSION_ROUND_TRIP(ts, absl::TimeFromTimespec, absl::ToTimespec,
+ TimespecMatcher);
+ ts.tv_sec = 0;
+ ts.tv_nsec = 0;
+ TEST_CONVERSION_ROUND_TRIP(ts, absl::TimeFromTimespec, absl::ToTimespec,
+ TimespecMatcher);
+ ts.tv_sec = 0;
+ ts.tv_nsec = 1;
+ TEST_CONVERSION_ROUND_TRIP(ts, absl::TimeFromTimespec, absl::ToTimespec,
+ TimespecMatcher);
+ ts.tv_sec = 1;
+ ts.tv_nsec = 0;
+ TEST_CONVERSION_ROUND_TRIP(ts, absl::TimeFromTimespec, absl::ToTimespec,
+ TimespecMatcher);
+
+ // FromUDate() and ToUDate()
+ double now_ud = absl::GetCurrentTimeNanos() / 1000000;
+ TEST_CONVERSION_ROUND_TRIP(-1.5, absl::FromUDate, absl::ToUDate,
+ testing::DoubleEq);
+ TEST_CONVERSION_ROUND_TRIP(-1, absl::FromUDate, absl::ToUDate,
+ testing::DoubleEq);
+ TEST_CONVERSION_ROUND_TRIP(-0.5, absl::FromUDate, absl::ToUDate,
+ testing::DoubleEq);
+ TEST_CONVERSION_ROUND_TRIP(0, absl::FromUDate, absl::ToUDate,
+ testing::DoubleEq);
+ TEST_CONVERSION_ROUND_TRIP(0.5, absl::FromUDate, absl::ToUDate,
+ testing::DoubleEq);
+ TEST_CONVERSION_ROUND_TRIP(1, absl::FromUDate, absl::ToUDate,
+ testing::DoubleEq);
+ TEST_CONVERSION_ROUND_TRIP(1.5, absl::FromUDate, absl::ToUDate,
+ testing::DoubleEq);
+ TEST_CONVERSION_ROUND_TRIP(now_ud, absl::FromUDate, absl::ToUDate,
+ testing::DoubleEq)
+ << std::fixed << std::setprecision(17) << now_ud;
+
+ // FromUniversal() and ToUniversal()
+ int64_t now_uni = ((719162LL * (24 * 60 * 60)) * (1000 * 1000 * 10)) +
+ (absl::GetCurrentTimeNanos() / 100);
+ TEST_CONVERSION_ROUND_TRIP(-1, absl::FromUniversal, absl::ToUniversal,
+ testing::Eq);
+ TEST_CONVERSION_ROUND_TRIP(0, absl::FromUniversal, absl::ToUniversal,
+ testing::Eq);
+ TEST_CONVERSION_ROUND_TRIP(1, absl::FromUniversal, absl::ToUniversal,
+ testing::Eq);
+ TEST_CONVERSION_ROUND_TRIP(now_uni, absl::FromUniversal, absl::ToUniversal,
+ testing::Eq)
+ << now_uni;
+
+#undef TEST_CONVERSION_ROUND_TRIP
+}
+
+template <typename Duration>
+std::chrono::system_clock::time_point MakeChronoUnixTime(const Duration& d) {
+ return std::chrono::system_clock::from_time_t(0) + d;
+}
+
+TEST(Time, FromChrono) {
+ EXPECT_EQ(absl::FromTimeT(-1),
+ absl::FromChrono(std::chrono::system_clock::from_time_t(-1)));
+ EXPECT_EQ(absl::FromTimeT(0),
+ absl::FromChrono(std::chrono::system_clock::from_time_t(0)));
+ EXPECT_EQ(absl::FromTimeT(1),
+ absl::FromChrono(std::chrono::system_clock::from_time_t(1)));
+
+ EXPECT_EQ(
+ absl::FromUnixMillis(-1),
+ absl::FromChrono(MakeChronoUnixTime(std::chrono::milliseconds(-1))));
+ EXPECT_EQ(absl::FromUnixMillis(0),
+ absl::FromChrono(MakeChronoUnixTime(std::chrono::milliseconds(0))));
+ EXPECT_EQ(absl::FromUnixMillis(1),
+ absl::FromChrono(MakeChronoUnixTime(std::chrono::milliseconds(1))));
+
+ // Chrono doesn't define exactly its range and precision (neither does
+ // absl::Time), so let's simply test +/- ~100 years to make sure things work.
+ const auto century_sec = 60 * 60 * 24 * 365 * int64_t{100};
+ const auto century = std::chrono::seconds(century_sec);
+ const auto chrono_future = MakeChronoUnixTime(century);
+ const auto chrono_past = MakeChronoUnixTime(-century);
+ EXPECT_EQ(absl::FromUnixSeconds(century_sec),
+ absl::FromChrono(chrono_future));
+ EXPECT_EQ(absl::FromUnixSeconds(-century_sec), absl::FromChrono(chrono_past));
+
+ // Roundtrip them both back to chrono.
+ EXPECT_EQ(chrono_future,
+ absl::ToChronoTime(absl::FromUnixSeconds(century_sec)));
+ EXPECT_EQ(chrono_past,
+ absl::ToChronoTime(absl::FromUnixSeconds(-century_sec)));
+}
+
+TEST(Time, ToChronoTime) {
+ EXPECT_EQ(std::chrono::system_clock::from_time_t(-1),
+ absl::ToChronoTime(absl::FromTimeT(-1)));
+ EXPECT_EQ(std::chrono::system_clock::from_time_t(0),
+ absl::ToChronoTime(absl::FromTimeT(0)));
+ EXPECT_EQ(std::chrono::system_clock::from_time_t(1),
+ absl::ToChronoTime(absl::FromTimeT(1)));
+
+ EXPECT_EQ(MakeChronoUnixTime(std::chrono::milliseconds(-1)),
+ absl::ToChronoTime(absl::FromUnixMillis(-1)));
+ EXPECT_EQ(MakeChronoUnixTime(std::chrono::milliseconds(0)),
+ absl::ToChronoTime(absl::FromUnixMillis(0)));
+ EXPECT_EQ(MakeChronoUnixTime(std::chrono::milliseconds(1)),
+ absl::ToChronoTime(absl::FromUnixMillis(1)));
+
+ // Time before the Unix epoch should floor, not trunc.
+ const auto tick = absl::Nanoseconds(1) / 4;
+ EXPECT_EQ(std::chrono::system_clock::from_time_t(0) -
+ std::chrono::system_clock::duration(1),
+ absl::ToChronoTime(absl::UnixEpoch() - tick));
+}
+
+// Check that absl::int128 works as a std::chrono::duration representation.
+TEST(Time, Chrono128) {
+ // Define a std::chrono::time_point type whose time[sic]_since_epoch() is
+ // a signed 128-bit count of attoseconds. This has a range and resolution
+ // (currently) beyond those of absl::Time, and undoubtedly also beyond those
+ // of std::chrono::system_clock::time_point.
+ //
+ // Note: The to/from-chrono support should probably be updated to handle
+ // such wide representations.
+ using Timestamp =
+ std::chrono::time_point<std::chrono::system_clock,
+ std::chrono::duration<absl::int128, std::atto>>;
+
+ // Expect that we can round-trip the std::chrono::system_clock::time_point
+ // extremes through both absl::Time and Timestamp, and that Timestamp can
+ // handle the (current) absl::Time extremes.
+ //
+ // Note: We should use std::chrono::floor() instead of time_point_cast(),
+ // but floor() is only available since c++17.
+ for (const auto tp : {std::chrono::system_clock::time_point::min(),
+ std::chrono::system_clock::time_point::max()}) {
+ EXPECT_EQ(tp, absl::ToChronoTime(absl::FromChrono(tp)));
+ EXPECT_EQ(tp, std::chrono::time_point_cast<
+ std::chrono::system_clock::time_point::duration>(
+ std::chrono::time_point_cast<Timestamp::duration>(tp)));
+ }
+ Timestamp::duration::rep v = std::numeric_limits<int64_t>::min();
+ v *= Timestamp::duration::period::den;
+ auto ts = Timestamp(Timestamp::duration(v));
+ ts += std::chrono::duration<int64_t, std::atto>(0);
+ EXPECT_EQ(std::numeric_limits<int64_t>::min(),
+ ts.time_since_epoch().count() / Timestamp::duration::period::den);
+ EXPECT_EQ(0,
+ ts.time_since_epoch().count() % Timestamp::duration::period::den);
+ v = std::numeric_limits<int64_t>::max();
+ v *= Timestamp::duration::period::den;
+ ts = Timestamp(Timestamp::duration(v));
+ ts += std::chrono::duration<int64_t, std::atto>(999999999750000000);
+ EXPECT_EQ(std::numeric_limits<int64_t>::max(),
+ ts.time_since_epoch().count() / Timestamp::duration::period::den);
+ EXPECT_EQ(999999999750000000,
+ ts.time_since_epoch().count() % Timestamp::duration::period::den);
+}
+
+TEST(Time, TimeZoneAt) {
+ const absl::TimeZone nyc =
+ absl::time_internal::LoadTimeZone("America/New_York");
+ const std::string fmt = "%a, %e %b %Y %H:%M:%S %z (%Z)";
+
+ // A non-transition where the civil time is unique.
+ absl::CivilSecond nov01(2013, 11, 1, 8, 30, 0);
+ const auto nov01_ci = nyc.At(nov01);
+ EXPECT_EQ(absl::TimeZone::TimeInfo::UNIQUE, nov01_ci.kind);
+ EXPECT_EQ("Fri, 1 Nov 2013 08:30:00 -0400 (EDT)",
+ absl::FormatTime(fmt, nov01_ci.pre, nyc));
+ EXPECT_EQ(nov01_ci.pre, nov01_ci.trans);
+ EXPECT_EQ(nov01_ci.pre, nov01_ci.post);
+ EXPECT_EQ(nov01_ci.pre, absl::FromCivil(nov01, nyc));
+
+ // A Spring DST transition, when there is a gap in civil time
+ // and we prefer the later of the possible interpretations of a
+ // non-existent time.
+ absl::CivilSecond mar13(2011, 3, 13, 2, 15, 0);
+ const auto mar_ci = nyc.At(mar13);
+ EXPECT_EQ(absl::TimeZone::TimeInfo::SKIPPED, mar_ci.kind);
+ EXPECT_EQ("Sun, 13 Mar 2011 03:15:00 -0400 (EDT)",
+ absl::FormatTime(fmt, mar_ci.pre, nyc));
+ EXPECT_EQ("Sun, 13 Mar 2011 03:00:00 -0400 (EDT)",
+ absl::FormatTime(fmt, mar_ci.trans, nyc));
+ EXPECT_EQ("Sun, 13 Mar 2011 01:15:00 -0500 (EST)",
+ absl::FormatTime(fmt, mar_ci.post, nyc));
+ EXPECT_EQ(mar_ci.trans, absl::FromCivil(mar13, nyc));
+
+ // A Fall DST transition, when civil times are repeated and
+ // we prefer the earlier of the possible interpretations of an
+ // ambiguous time.
+ absl::CivilSecond nov06(2011, 11, 6, 1, 15, 0);
+ const auto nov06_ci = nyc.At(nov06);
+ EXPECT_EQ(absl::TimeZone::TimeInfo::REPEATED, nov06_ci.kind);
+ EXPECT_EQ("Sun, 6 Nov 2011 01:15:00 -0400 (EDT)",
+ absl::FormatTime(fmt, nov06_ci.pre, nyc));
+ EXPECT_EQ("Sun, 6 Nov 2011 01:00:00 -0500 (EST)",
+ absl::FormatTime(fmt, nov06_ci.trans, nyc));
+ EXPECT_EQ("Sun, 6 Nov 2011 01:15:00 -0500 (EST)",
+ absl::FormatTime(fmt, nov06_ci.post, nyc));
+ EXPECT_EQ(nov06_ci.pre, absl::FromCivil(nov06, nyc));
+
+ // Check that (time_t) -1 is handled correctly.
+ absl::CivilSecond minus1(1969, 12, 31, 18, 59, 59);
+ const auto minus1_cl = nyc.At(minus1);
+ EXPECT_EQ(absl::TimeZone::TimeInfo::UNIQUE, minus1_cl.kind);
+ EXPECT_EQ(-1, absl::ToTimeT(minus1_cl.pre));
+ EXPECT_EQ("Wed, 31 Dec 1969 18:59:59 -0500 (EST)",
+ absl::FormatTime(fmt, minus1_cl.pre, nyc));
+ EXPECT_EQ("Wed, 31 Dec 1969 23:59:59 +0000 (UTC)",
+ absl::FormatTime(fmt, minus1_cl.pre, absl::UTCTimeZone()));
+}
+
+// FromCivil(CivilSecond(year, mon, day, hour, min, sec), UTCTimeZone())
+// has a specialized fastpath implementation, which we exercise here.
+TEST(Time, FromCivilUTC) {
+ const absl::TimeZone utc = absl::UTCTimeZone();
+ const std::string fmt = "%a, %e %b %Y %H:%M:%S %z (%Z)";
+ const int kMax = std::numeric_limits<int>::max();
+ const int kMin = std::numeric_limits<int>::min();
+ absl::Time t;
+
+ // 292091940881 is the last positive year to use the fastpath.
+ t = absl::FromCivil(
+ absl::CivilSecond(292091940881, kMax, kMax, kMax, kMax, kMax), utc);
+ EXPECT_EQ("Fri, 25 Nov 292277026596 12:21:07 +0000 (UTC)",
+ absl::FormatTime(fmt, t, utc));
+ t = absl::FromCivil(
+ absl::CivilSecond(292091940882, kMax, kMax, kMax, kMax, kMax), utc);
+ EXPECT_EQ("infinite-future", absl::FormatTime(fmt, t, utc)); // no overflow
+
+ // -292091936940 is the last negative year to use the fastpath.
+ t = absl::FromCivil(
+ absl::CivilSecond(-292091936940, kMin, kMin, kMin, kMin, kMin), utc);
+ EXPECT_EQ("Fri, 1 Nov -292277022657 10:37:52 +0000 (UTC)",
+ absl::FormatTime(fmt, t, utc));
+ t = absl::FromCivil(
+ absl::CivilSecond(-292091936941, kMin, kMin, kMin, kMin, kMin), utc);
+ EXPECT_EQ("infinite-past", absl::FormatTime(fmt, t, utc)); // no underflow
+
+ // Check that we're counting leap years correctly.
+ t = absl::FromCivil(absl::CivilSecond(1900, 2, 28, 23, 59, 59), utc);
+ EXPECT_EQ("Wed, 28 Feb 1900 23:59:59 +0000 (UTC)",
+ absl::FormatTime(fmt, t, utc));
+ t = absl::FromCivil(absl::CivilSecond(1900, 3, 1, 0, 0, 0), utc);
+ EXPECT_EQ("Thu, 1 Mar 1900 00:00:00 +0000 (UTC)",
+ absl::FormatTime(fmt, t, utc));
+ t = absl::FromCivil(absl::CivilSecond(2000, 2, 29, 23, 59, 59), utc);
+ EXPECT_EQ("Tue, 29 Feb 2000 23:59:59 +0000 (UTC)",
+ absl::FormatTime(fmt, t, utc));
+ t = absl::FromCivil(absl::CivilSecond(2000, 3, 1, 0, 0, 0), utc);
+ EXPECT_EQ("Wed, 1 Mar 2000 00:00:00 +0000 (UTC)",
+ absl::FormatTime(fmt, t, utc));
+}
+
+TEST(Time, ToTM) {
+ const absl::TimeZone utc = absl::UTCTimeZone();
+
+ // Compares the results of ToTM() to gmtime_r() for lots of times over the
+ // course of a few days.
+ const absl::Time start =
+ absl::FromCivil(absl::CivilSecond(2014, 1, 2, 3, 4, 5), utc);
+ const absl::Time end =
+ absl::FromCivil(absl::CivilSecond(2014, 1, 5, 3, 4, 5), utc);
+ for (absl::Time t = start; t < end; t += absl::Seconds(30)) {
+ const struct tm tm_bt = ToTM(t, utc);
+ const time_t tt = absl::ToTimeT(t);
+ struct tm tm_lc;
+#ifdef _WIN32
+ gmtime_s(&tm_lc, &tt);
+#else
+ gmtime_r(&tt, &tm_lc);
+#endif
+ EXPECT_EQ(tm_lc.tm_year, tm_bt.tm_year);
+ EXPECT_EQ(tm_lc.tm_mon, tm_bt.tm_mon);
+ EXPECT_EQ(tm_lc.tm_mday, tm_bt.tm_mday);
+ EXPECT_EQ(tm_lc.tm_hour, tm_bt.tm_hour);
+ EXPECT_EQ(tm_lc.tm_min, tm_bt.tm_min);
+ EXPECT_EQ(tm_lc.tm_sec, tm_bt.tm_sec);
+ EXPECT_EQ(tm_lc.tm_wday, tm_bt.tm_wday);
+ EXPECT_EQ(tm_lc.tm_yday, tm_bt.tm_yday);
+ EXPECT_EQ(tm_lc.tm_isdst, tm_bt.tm_isdst);
+
+ ASSERT_FALSE(HasFailure());
+ }
+
+ // Checks that the tm_isdst field is correct when in standard time.
+ const absl::TimeZone nyc =
+ absl::time_internal::LoadTimeZone("America/New_York");
+ absl::Time t = absl::FromCivil(absl::CivilSecond(2014, 3, 1, 0, 0, 0), nyc);
+ struct tm tm = ToTM(t, nyc);
+ EXPECT_FALSE(tm.tm_isdst);
+
+ // Checks that the tm_isdst field is correct when in daylight time.
+ t = absl::FromCivil(absl::CivilSecond(2014, 4, 1, 0, 0, 0), nyc);
+ tm = ToTM(t, nyc);
+ EXPECT_TRUE(tm.tm_isdst);
+
+ // Checks overflow.
+ tm = ToTM(absl::InfiniteFuture(), nyc);
+ EXPECT_EQ(std::numeric_limits<int>::max() - 1900, tm.tm_year);
+ EXPECT_EQ(11, tm.tm_mon);
+ EXPECT_EQ(31, tm.tm_mday);
+ EXPECT_EQ(23, tm.tm_hour);
+ EXPECT_EQ(59, tm.tm_min);
+ EXPECT_EQ(59, tm.tm_sec);
+ EXPECT_EQ(4, tm.tm_wday);
+ EXPECT_EQ(364, tm.tm_yday);
+ EXPECT_FALSE(tm.tm_isdst);
+
+ // Checks underflow.
+ tm = ToTM(absl::InfinitePast(), nyc);
+ EXPECT_EQ(std::numeric_limits<int>::min(), tm.tm_year);
+ EXPECT_EQ(0, tm.tm_mon);
+ EXPECT_EQ(1, tm.tm_mday);
+ EXPECT_EQ(0, tm.tm_hour);
+ EXPECT_EQ(0, tm.tm_min);
+ EXPECT_EQ(0, tm.tm_sec);
+ EXPECT_EQ(0, tm.tm_wday);
+ EXPECT_EQ(0, tm.tm_yday);
+ EXPECT_FALSE(tm.tm_isdst);
+}
+
+TEST(Time, FromTM) {
+ const absl::TimeZone nyc =
+ absl::time_internal::LoadTimeZone("America/New_York");
+
+ // Verifies that tm_isdst doesn't affect anything when the time is unique.
+ struct tm tm;
+ std::memset(&tm, 0, sizeof(tm));
+ tm.tm_year = 2014 - 1900;
+ tm.tm_mon = 6 - 1;
+ tm.tm_mday = 28;
+ tm.tm_hour = 1;
+ tm.tm_min = 2;
+ tm.tm_sec = 3;
+ tm.tm_isdst = -1;
+ absl::Time t = FromTM(tm, nyc);
+ EXPECT_EQ("2014-06-28T01:02:03-04:00", absl::FormatTime(t, nyc)); // DST
+ tm.tm_isdst = 0;
+ t = FromTM(tm, nyc);
+ EXPECT_EQ("2014-06-28T01:02:03-04:00", absl::FormatTime(t, nyc)); // DST
+ tm.tm_isdst = 1;
+ t = FromTM(tm, nyc);
+ EXPECT_EQ("2014-06-28T01:02:03-04:00", absl::FormatTime(t, nyc)); // DST
+
+ // Adjusts tm to refer to an ambiguous time.
+ tm.tm_year = 2014 - 1900;
+ tm.tm_mon = 11 - 1;
+ tm.tm_mday = 2;
+ tm.tm_hour = 1;
+ tm.tm_min = 30;
+ tm.tm_sec = 42;
+ tm.tm_isdst = -1;
+ t = FromTM(tm, nyc);
+ EXPECT_EQ("2014-11-02T01:30:42-04:00", absl::FormatTime(t, nyc)); // DST
+ tm.tm_isdst = 0;
+ t = FromTM(tm, nyc);
+ EXPECT_EQ("2014-11-02T01:30:42-05:00", absl::FormatTime(t, nyc)); // STD
+ tm.tm_isdst = 1;
+ t = FromTM(tm, nyc);
+ EXPECT_EQ("2014-11-02T01:30:42-04:00", absl::FormatTime(t, nyc)); // DST
+
+ // Adjusts tm to refer to a skipped time.
+ tm.tm_year = 2014 - 1900;
+ tm.tm_mon = 3 - 1;
+ tm.tm_mday = 9;
+ tm.tm_hour = 2;
+ tm.tm_min = 30;
+ tm.tm_sec = 42;
+ tm.tm_isdst = -1;
+ t = FromTM(tm, nyc);
+ EXPECT_EQ("2014-03-09T03:30:42-04:00", absl::FormatTime(t, nyc)); // DST
+ tm.tm_isdst = 0;
+ t = FromTM(tm, nyc);
+ EXPECT_EQ("2014-03-09T01:30:42-05:00", absl::FormatTime(t, nyc)); // STD
+ tm.tm_isdst = 1;
+ t = FromTM(tm, nyc);
+ EXPECT_EQ("2014-03-09T03:30:42-04:00", absl::FormatTime(t, nyc)); // DST
+
+ // Adjusts tm to refer to a time with a year larger than 2147483647.
+ tm.tm_year = 2147483647 - 1900 + 1;
+ tm.tm_mon = 6 - 1;
+ tm.tm_mday = 28;
+ tm.tm_hour = 1;
+ tm.tm_min = 2;
+ tm.tm_sec = 3;
+ tm.tm_isdst = -1;
+ t = FromTM(tm, absl::UTCTimeZone());
+ EXPECT_EQ("2147483648-06-28T01:02:03+00:00",
+ absl::FormatTime(t, absl::UTCTimeZone()));
+
+ // Adjusts tm to refer to a time with a very large month.
+ tm.tm_year = 2019 - 1900;
+ tm.tm_mon = 2147483647;
+ tm.tm_mday = 28;
+ tm.tm_hour = 1;
+ tm.tm_min = 2;
+ tm.tm_sec = 3;
+ tm.tm_isdst = -1;
+ t = FromTM(tm, absl::UTCTimeZone());
+ EXPECT_EQ("178958989-08-28T01:02:03+00:00",
+ absl::FormatTime(t, absl::UTCTimeZone()));
+}
+
+TEST(Time, TMRoundTrip) {
+ const absl::TimeZone nyc =
+ absl::time_internal::LoadTimeZone("America/New_York");
+
+ // Test round-tripping across a skipped transition
+ absl::Time start = absl::FromCivil(absl::CivilHour(2014, 3, 9, 0), nyc);
+ absl::Time end = absl::FromCivil(absl::CivilHour(2014, 3, 9, 4), nyc);
+ for (absl::Time t = start; t < end; t += absl::Minutes(1)) {
+ struct tm tm = ToTM(t, nyc);
+ absl::Time rt = FromTM(tm, nyc);
+ EXPECT_EQ(rt, t);
+ }
+
+ // Test round-tripping across an ambiguous transition
+ start = absl::FromCivil(absl::CivilHour(2014, 11, 2, 0), nyc);
+ end = absl::FromCivil(absl::CivilHour(2014, 11, 2, 4), nyc);
+ for (absl::Time t = start; t < end; t += absl::Minutes(1)) {
+ struct tm tm = ToTM(t, nyc);
+ absl::Time rt = FromTM(tm, nyc);
+ EXPECT_EQ(rt, t);
+ }
+
+ // Test round-tripping of unique instants crossing a day boundary
+ start = absl::FromCivil(absl::CivilHour(2014, 6, 27, 22), nyc);
+ end = absl::FromCivil(absl::CivilHour(2014, 6, 28, 4), nyc);
+ for (absl::Time t = start; t < end; t += absl::Minutes(1)) {
+ struct tm tm = ToTM(t, nyc);
+ absl::Time rt = FromTM(tm, nyc);
+ EXPECT_EQ(rt, t);
+ }
+}
+
+TEST(Time, Range) {
+ // The API's documented range is +/- 100 billion years.
+ const absl::Duration range = absl::Hours(24) * 365.2425 * 100000000000;
+
+ // Arithmetic and comparison still works at +/-range around base values.
+ absl::Time bases[2] = {absl::UnixEpoch(), absl::Now()};
+ for (const auto base : bases) {
+ absl::Time bottom = base - range;
+ EXPECT_GT(bottom, bottom - absl::Nanoseconds(1));
+ EXPECT_LT(bottom, bottom + absl::Nanoseconds(1));
+ absl::Time top = base + range;
+ EXPECT_GT(top, top - absl::Nanoseconds(1));
+ EXPECT_LT(top, top + absl::Nanoseconds(1));
+ absl::Duration full_range = 2 * range;
+ EXPECT_EQ(full_range, top - bottom);
+ EXPECT_EQ(-full_range, bottom - top);
+ }
+}
+
+TEST(Time, Limits) {
+ // It is an implementation detail that Time().rep_ == ZeroDuration(),
+ // and that the resolution of a Duration is 1/4 of a nanosecond.
+ const absl::Time zero;
+ const absl::Time max =
+ zero + absl::Seconds(std::numeric_limits<int64_t>::max()) +
+ absl::Nanoseconds(999999999) + absl::Nanoseconds(3) / 4;
+ const absl::Time min =
+ zero + absl::Seconds(std::numeric_limits<int64_t>::min());
+
+ // Some simple max/min bounds checks.
+ EXPECT_LT(max, absl::InfiniteFuture());
+ EXPECT_GT(min, absl::InfinitePast());
+ EXPECT_LT(zero, max);
+ EXPECT_GT(zero, min);
+ EXPECT_GE(absl::UnixEpoch(), min);
+ EXPECT_LT(absl::UnixEpoch(), max);
+
+ // Check sign of Time differences.
+ EXPECT_LT(absl::ZeroDuration(), max - zero);
+ EXPECT_LT(absl::ZeroDuration(),
+ zero - absl::Nanoseconds(1) / 4 - min); // avoid zero - min
+
+ // Arithmetic works at max - 0.25ns and min + 0.25ns.
+ EXPECT_GT(max, max - absl::Nanoseconds(1) / 4);
+ EXPECT_LT(min, min + absl::Nanoseconds(1) / 4);
+}
+
+TEST(Time, ConversionSaturation) {
+ const absl::TimeZone utc = absl::UTCTimeZone();
+ absl::Time t;
+
+ const auto max_time_t = std::numeric_limits<time_t>::max();
+ const auto min_time_t = std::numeric_limits<time_t>::min();
+ time_t tt = max_time_t - 1;
+ t = absl::FromTimeT(tt);
+ tt = absl::ToTimeT(t);
+ EXPECT_EQ(max_time_t - 1, tt);
+ t += absl::Seconds(1);
+ tt = absl::ToTimeT(t);
+ EXPECT_EQ(max_time_t, tt);
+ t += absl::Seconds(1); // no effect
+ tt = absl::ToTimeT(t);
+ EXPECT_EQ(max_time_t, tt);
+
+ tt = min_time_t + 1;
+ t = absl::FromTimeT(tt);
+ tt = absl::ToTimeT(t);
+ EXPECT_EQ(min_time_t + 1, tt);
+ t -= absl::Seconds(1);
+ tt = absl::ToTimeT(t);
+ EXPECT_EQ(min_time_t, tt);
+ t -= absl::Seconds(1); // no effect
+ tt = absl::ToTimeT(t);
+ EXPECT_EQ(min_time_t, tt);
+
+ const auto max_timeval_sec =
+ std::numeric_limits<decltype(timeval::tv_sec)>::max();
+ const auto min_timeval_sec =
+ std::numeric_limits<decltype(timeval::tv_sec)>::min();
+ timeval tv;
+ tv.tv_sec = max_timeval_sec;
+ tv.tv_usec = 999998;
+ t = absl::TimeFromTimeval(tv);
+ tv = ToTimeval(t);
+ EXPECT_EQ(max_timeval_sec, tv.tv_sec);
+ EXPECT_EQ(999998, tv.tv_usec);
+ t += absl::Microseconds(1);
+ tv = ToTimeval(t);
+ EXPECT_EQ(max_timeval_sec, tv.tv_sec);
+ EXPECT_EQ(999999, tv.tv_usec);
+ t += absl::Microseconds(1); // no effect
+ tv = ToTimeval(t);
+ EXPECT_EQ(max_timeval_sec, tv.tv_sec);
+ EXPECT_EQ(999999, tv.tv_usec);
+
+ tv.tv_sec = min_timeval_sec;
+ tv.tv_usec = 1;
+ t = absl::TimeFromTimeval(tv);
+ tv = ToTimeval(t);
+ EXPECT_EQ(min_timeval_sec, tv.tv_sec);
+ EXPECT_EQ(1, tv.tv_usec);
+ t -= absl::Microseconds(1);
+ tv = ToTimeval(t);
+ EXPECT_EQ(min_timeval_sec, tv.tv_sec);
+ EXPECT_EQ(0, tv.tv_usec);
+ t -= absl::Microseconds(1); // no effect
+ tv = ToTimeval(t);
+ EXPECT_EQ(min_timeval_sec, tv.tv_sec);
+ EXPECT_EQ(0, tv.tv_usec);
+
+ const auto max_timespec_sec =
+ std::numeric_limits<decltype(timespec::tv_sec)>::max();
+ const auto min_timespec_sec =
+ std::numeric_limits<decltype(timespec::tv_sec)>::min();
+ timespec ts;
+ ts.tv_sec = max_timespec_sec;
+ ts.tv_nsec = 999999998;
+ t = absl::TimeFromTimespec(ts);
+ ts = absl::ToTimespec(t);
+ EXPECT_EQ(max_timespec_sec, ts.tv_sec);
+ EXPECT_EQ(999999998, ts.tv_nsec);
+ t += absl::Nanoseconds(1);
+ ts = absl::ToTimespec(t);
+ EXPECT_EQ(max_timespec_sec, ts.tv_sec);
+ EXPECT_EQ(999999999, ts.tv_nsec);
+ t += absl::Nanoseconds(1); // no effect
+ ts = absl::ToTimespec(t);
+ EXPECT_EQ(max_timespec_sec, ts.tv_sec);
+ EXPECT_EQ(999999999, ts.tv_nsec);
+
+ ts.tv_sec = min_timespec_sec;
+ ts.tv_nsec = 1;
+ t = absl::TimeFromTimespec(ts);
+ ts = absl::ToTimespec(t);
+ EXPECT_EQ(min_timespec_sec, ts.tv_sec);
+ EXPECT_EQ(1, ts.tv_nsec);
+ t -= absl::Nanoseconds(1);
+ ts = absl::ToTimespec(t);
+ EXPECT_EQ(min_timespec_sec, ts.tv_sec);
+ EXPECT_EQ(0, ts.tv_nsec);
+ t -= absl::Nanoseconds(1); // no effect
+ ts = absl::ToTimespec(t);
+ EXPECT_EQ(min_timespec_sec, ts.tv_sec);
+ EXPECT_EQ(0, ts.tv_nsec);
+
+ // Checks how TimeZone::At() saturates on infinities.
+ auto ci = utc.At(absl::InfiniteFuture());
+ EXPECT_CIVIL_INFO(ci, std::numeric_limits<int64_t>::max(), 12, 31, 23, 59, 59,
+ 0, false);
+ EXPECT_EQ(absl::InfiniteDuration(), ci.subsecond);
+ EXPECT_EQ(absl::Weekday::thursday, absl::GetWeekday(ci.cs));
+ EXPECT_EQ(365, absl::GetYearDay(ci.cs));
+ EXPECT_STREQ("-00", ci.zone_abbr); // artifact of TimeZone::At()
+ ci = utc.At(absl::InfinitePast());
+ EXPECT_CIVIL_INFO(ci, std::numeric_limits<int64_t>::min(), 1, 1, 0, 0, 0, 0,
+ false);
+ EXPECT_EQ(-absl::InfiniteDuration(), ci.subsecond);
+ EXPECT_EQ(absl::Weekday::sunday, absl::GetWeekday(ci.cs));
+ EXPECT_EQ(1, absl::GetYearDay(ci.cs));
+ EXPECT_STREQ("-00", ci.zone_abbr); // artifact of TimeZone::At()
+
+ // Approach the maximal Time value from below.
+ t = absl::FromCivil(absl::CivilSecond(292277026596, 12, 4, 15, 30, 6), utc);
+ EXPECT_EQ("292277026596-12-04T15:30:06+00:00",
+ absl::FormatTime(absl::RFC3339_full, t, utc));
+ t = absl::FromCivil(absl::CivilSecond(292277026596, 12, 4, 15, 30, 7), utc);
+ EXPECT_EQ("292277026596-12-04T15:30:07+00:00",
+ absl::FormatTime(absl::RFC3339_full, t, utc));
+ EXPECT_EQ(
+ absl::UnixEpoch() + absl::Seconds(std::numeric_limits<int64_t>::max()),
+ t);
+
+ // Checks that we can also get the maximal Time value for a far-east zone.
+ const absl::TimeZone plus14 = absl::FixedTimeZone(14 * 60 * 60);
+ t = absl::FromCivil(absl::CivilSecond(292277026596, 12, 5, 5, 30, 7), plus14);
+ EXPECT_EQ("292277026596-12-05T05:30:07+14:00",
+ absl::FormatTime(absl::RFC3339_full, t, plus14));
+ EXPECT_EQ(
+ absl::UnixEpoch() + absl::Seconds(std::numeric_limits<int64_t>::max()),
+ t);
+
+ // One second later should push us to infinity.
+ t = absl::FromCivil(absl::CivilSecond(292277026596, 12, 4, 15, 30, 8), utc);
+ EXPECT_EQ("infinite-future", absl::FormatTime(absl::RFC3339_full, t, utc));
+
+ // Approach the minimal Time value from above.
+ t = absl::FromCivil(absl::CivilSecond(-292277022657, 1, 27, 8, 29, 53), utc);
+ EXPECT_EQ("-292277022657-01-27T08:29:53+00:00",
+ absl::FormatTime(absl::RFC3339_full, t, utc));
+ t = absl::FromCivil(absl::CivilSecond(-292277022657, 1, 27, 8, 29, 52), utc);
+ EXPECT_EQ("-292277022657-01-27T08:29:52+00:00",
+ absl::FormatTime(absl::RFC3339_full, t, utc));
+ EXPECT_EQ(
+ absl::UnixEpoch() + absl::Seconds(std::numeric_limits<int64_t>::min()),
+ t);
+
+ // Checks that we can also get the minimal Time value for a far-west zone.
+ const absl::TimeZone minus12 = absl::FixedTimeZone(-12 * 60 * 60);
+ t = absl::FromCivil(absl::CivilSecond(-292277022657, 1, 26, 20, 29, 52),
+ minus12);
+ EXPECT_EQ("-292277022657-01-26T20:29:52-12:00",
+ absl::FormatTime(absl::RFC3339_full, t, minus12));
+ EXPECT_EQ(
+ absl::UnixEpoch() + absl::Seconds(std::numeric_limits<int64_t>::min()),
+ t);
+
+ // One second before should push us to -infinity.
+ t = absl::FromCivil(absl::CivilSecond(-292277022657, 1, 27, 8, 29, 51), utc);
+ EXPECT_EQ("infinite-past", absl::FormatTime(absl::RFC3339_full, t, utc));
+}
+
+// In zones with POSIX-style recurring rules we use special logic to
+// handle conversions in the distant future. Here we check the limits
+// of those conversions, particularly with respect to integer overflow.
+TEST(Time, ExtendedConversionSaturation) {
+ const absl::TimeZone syd =
+ absl::time_internal::LoadTimeZone("Australia/Sydney");
+ const absl::TimeZone nyc =
+ absl::time_internal::LoadTimeZone("America/New_York");
+ const absl::Time max =
+ absl::FromUnixSeconds(std::numeric_limits<int64_t>::max());
+ absl::TimeZone::CivilInfo ci;
+ absl::Time t;
+
+ // The maximal time converted in each zone.
+ ci = syd.At(max);
+ EXPECT_CIVIL_INFO(ci, 292277026596, 12, 5, 2, 30, 7, 39600, true);
+ t = absl::FromCivil(absl::CivilSecond(292277026596, 12, 5, 2, 30, 7), syd);
+ EXPECT_EQ(max, t);
+ ci = nyc.At(max);
+ EXPECT_CIVIL_INFO(ci, 292277026596, 12, 4, 10, 30, 7, -18000, false);
+ t = absl::FromCivil(absl::CivilSecond(292277026596, 12, 4, 10, 30, 7), nyc);
+ EXPECT_EQ(max, t);
+
+ // One second later should push us to infinity.
+ t = absl::FromCivil(absl::CivilSecond(292277026596, 12, 5, 2, 30, 8), syd);
+ EXPECT_EQ(absl::InfiniteFuture(), t);
+ t = absl::FromCivil(absl::CivilSecond(292277026596, 12, 4, 10, 30, 8), nyc);
+ EXPECT_EQ(absl::InfiniteFuture(), t);
+
+ // And we should stick there.
+ t = absl::FromCivil(absl::CivilSecond(292277026596, 12, 5, 2, 30, 9), syd);
+ EXPECT_EQ(absl::InfiniteFuture(), t);
+ t = absl::FromCivil(absl::CivilSecond(292277026596, 12, 4, 10, 30, 9), nyc);
+ EXPECT_EQ(absl::InfiniteFuture(), t);
+
+ // All the way up to a saturated date/time, without overflow.
+ t = absl::FromCivil(absl::CivilSecond::max(), syd);
+ EXPECT_EQ(absl::InfiniteFuture(), t);
+ t = absl::FromCivil(absl::CivilSecond::max(), nyc);
+ EXPECT_EQ(absl::InfiniteFuture(), t);
+}
+
+TEST(Time, FromCivilAlignment) {
+ const absl::TimeZone utc = absl::UTCTimeZone();
+ const absl::CivilSecond cs(2015, 2, 3, 4, 5, 6);
+ absl::Time t = absl::FromCivil(cs, utc);
+ EXPECT_EQ("2015-02-03T04:05:06+00:00", absl::FormatTime(t, utc));
+ t = absl::FromCivil(absl::CivilMinute(cs), utc);
+ EXPECT_EQ("2015-02-03T04:05:00+00:00", absl::FormatTime(t, utc));
+ t = absl::FromCivil(absl::CivilHour(cs), utc);
+ EXPECT_EQ("2015-02-03T04:00:00+00:00", absl::FormatTime(t, utc));
+ t = absl::FromCivil(absl::CivilDay(cs), utc);
+ EXPECT_EQ("2015-02-03T00:00:00+00:00", absl::FormatTime(t, utc));
+ t = absl::FromCivil(absl::CivilMonth(cs), utc);
+ EXPECT_EQ("2015-02-01T00:00:00+00:00", absl::FormatTime(t, utc));
+ t = absl::FromCivil(absl::CivilYear(cs), utc);
+ EXPECT_EQ("2015-01-01T00:00:00+00:00", absl::FormatTime(t, utc));
+}
+
+TEST(Time, LegacyDateTime) {
+ const absl::TimeZone utc = absl::UTCTimeZone();
+ const std::string ymdhms = "%Y-%m-%d %H:%M:%S";
+ const int kMax = std::numeric_limits<int>::max();
+ const int kMin = std::numeric_limits<int>::min();
+ absl::Time t;
+
+ t = absl::FromDateTime(std::numeric_limits<absl::civil_year_t>::max(), kMax,
+ kMax, kMax, kMax, kMax, utc);
+ EXPECT_EQ("infinite-future",
+ absl::FormatTime(ymdhms, t, utc)); // no overflow
+ t = absl::FromDateTime(std::numeric_limits<absl::civil_year_t>::min(), kMin,
+ kMin, kMin, kMin, kMin, utc);
+ EXPECT_EQ("infinite-past", absl::FormatTime(ymdhms, t, utc)); // no overflow
+
+ // Check normalization.
+ EXPECT_TRUE(absl::ConvertDateTime(2013, 10, 32, 8, 30, 0, utc).normalized);
+ t = absl::FromDateTime(2015, 1, 1, 0, 0, 60, utc);
+ EXPECT_EQ("2015-01-01 00:01:00", absl::FormatTime(ymdhms, t, utc));
+ t = absl::FromDateTime(2015, 1, 1, 0, 60, 0, utc);
+ EXPECT_EQ("2015-01-01 01:00:00", absl::FormatTime(ymdhms, t, utc));
+ t = absl::FromDateTime(2015, 1, 1, 24, 0, 0, utc);
+ EXPECT_EQ("2015-01-02 00:00:00", absl::FormatTime(ymdhms, t, utc));
+ t = absl::FromDateTime(2015, 1, 32, 0, 0, 0, utc);
+ EXPECT_EQ("2015-02-01 00:00:00", absl::FormatTime(ymdhms, t, utc));
+ t = absl::FromDateTime(2015, 13, 1, 0, 0, 0, utc);
+ EXPECT_EQ("2016-01-01 00:00:00", absl::FormatTime(ymdhms, t, utc));
+ t = absl::FromDateTime(2015, 13, 32, 60, 60, 60, utc);
+ EXPECT_EQ("2016-02-03 13:01:00", absl::FormatTime(ymdhms, t, utc));
+ t = absl::FromDateTime(2015, 1, 1, 0, 0, -1, utc);
+ EXPECT_EQ("2014-12-31 23:59:59", absl::FormatTime(ymdhms, t, utc));
+ t = absl::FromDateTime(2015, 1, 1, 0, -1, 0, utc);
+ EXPECT_EQ("2014-12-31 23:59:00", absl::FormatTime(ymdhms, t, utc));
+ t = absl::FromDateTime(2015, 1, 1, -1, 0, 0, utc);
+ EXPECT_EQ("2014-12-31 23:00:00", absl::FormatTime(ymdhms, t, utc));
+ t = absl::FromDateTime(2015, 1, -1, 0, 0, 0, utc);
+ EXPECT_EQ("2014-12-30 00:00:00", absl::FormatTime(ymdhms, t, utc));
+ t = absl::FromDateTime(2015, -1, 1, 0, 0, 0, utc);
+ EXPECT_EQ("2014-11-01 00:00:00", absl::FormatTime(ymdhms, t, utc));
+ t = absl::FromDateTime(2015, -1, -1, -1, -1, -1, utc);
+ EXPECT_EQ("2014-10-29 22:58:59", absl::FormatTime(ymdhms, t, utc));
+}
+
+TEST(Time, NextTransitionUTC) {
+ const auto tz = absl::UTCTimeZone();
+ absl::TimeZone::CivilTransition trans;
+
+ auto t = absl::InfinitePast();
+ EXPECT_FALSE(tz.NextTransition(t, &trans));
+
+ t = absl::InfiniteFuture();
+ EXPECT_FALSE(tz.NextTransition(t, &trans));
+}
+
+TEST(Time, PrevTransitionUTC) {
+ const auto tz = absl::UTCTimeZone();
+ absl::TimeZone::CivilTransition trans;
+
+ auto t = absl::InfiniteFuture();
+ EXPECT_FALSE(tz.PrevTransition(t, &trans));
+
+ t = absl::InfinitePast();
+ EXPECT_FALSE(tz.PrevTransition(t, &trans));
+}
+
+TEST(Time, NextTransitionNYC) {
+ const auto tz = absl::time_internal::LoadTimeZone("America/New_York");
+ absl::TimeZone::CivilTransition trans;
+
+ auto t = absl::FromCivil(absl::CivilSecond(2018, 6, 30, 0, 0, 0), tz);
+ EXPECT_TRUE(tz.NextTransition(t, &trans));
+ EXPECT_EQ(absl::CivilSecond(2018, 11, 4, 2, 0, 0), trans.from);
+ EXPECT_EQ(absl::CivilSecond(2018, 11, 4, 1, 0, 0), trans.to);
+
+ t = absl::InfiniteFuture();
+ EXPECT_FALSE(tz.NextTransition(t, &trans));
+
+ t = absl::InfinitePast();
+ EXPECT_TRUE(tz.NextTransition(t, &trans));
+ if (trans.from == absl::CivilSecond(1918, 03, 31, 2, 0, 0)) {
+ // It looks like the tzdata is only 32 bit (probably macOS),
+ // which bottoms out at 1901-12-13T20:45:52+00:00.
+ EXPECT_EQ(absl::CivilSecond(1918, 3, 31, 3, 0, 0), trans.to);
+ } else {
+ EXPECT_EQ(absl::CivilSecond(1883, 11, 18, 12, 3, 58), trans.from);
+ EXPECT_EQ(absl::CivilSecond(1883, 11, 18, 12, 0, 0), trans.to);
+ }
+}
+
+TEST(Time, PrevTransitionNYC) {
+ const auto tz = absl::time_internal::LoadTimeZone("America/New_York");
+ absl::TimeZone::CivilTransition trans;
+
+ auto t = absl::FromCivil(absl::CivilSecond(2018, 6, 30, 0, 0, 0), tz);
+ EXPECT_TRUE(tz.PrevTransition(t, &trans));
+ EXPECT_EQ(absl::CivilSecond(2018, 3, 11, 2, 0, 0), trans.from);
+ EXPECT_EQ(absl::CivilSecond(2018, 3, 11, 3, 0, 0), trans.to);
+
+ t = absl::InfinitePast();
+ EXPECT_FALSE(tz.PrevTransition(t, &trans));
+
+ t = absl::InfiniteFuture();
+ EXPECT_TRUE(tz.PrevTransition(t, &trans));
+ // We have a transition but we don't know which one.
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/time/time_zone_test.cc b/third_party/abseil/src/absl/time/time_zone_test.cc
new file mode 100644
index 0000000..229fcfc
--- /dev/null
+++ b/third_party/abseil/src/absl/time/time_zone_test.cc
@@ -0,0 +1,97 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/time/internal/cctz/include/cctz/time_zone.h"
+
+#include "gtest/gtest.h"
+#include "absl/time/internal/test_util.h"
+#include "absl/time/time.h"
+
+namespace cctz = absl::time_internal::cctz;
+
+namespace {
+
+TEST(TimeZone, ValueSemantics) {
+ absl::TimeZone tz;
+ absl::TimeZone tz2 = tz; // Copy-construct
+ EXPECT_EQ(tz, tz2);
+ tz2 = tz; // Copy-assign
+ EXPECT_EQ(tz, tz2);
+}
+
+TEST(TimeZone, Equality) {
+ absl::TimeZone a, b;
+ EXPECT_EQ(a, b);
+ EXPECT_EQ(a.name(), b.name());
+
+ absl::TimeZone implicit_utc;
+ absl::TimeZone explicit_utc = absl::UTCTimeZone();
+ EXPECT_EQ(implicit_utc, explicit_utc);
+ EXPECT_EQ(implicit_utc.name(), explicit_utc.name());
+
+ absl::TimeZone la = absl::time_internal::LoadTimeZone("America/Los_Angeles");
+ absl::TimeZone nyc = absl::time_internal::LoadTimeZone("America/New_York");
+ EXPECT_NE(la, nyc);
+}
+
+TEST(TimeZone, CCTZConversion) {
+ const cctz::time_zone cz = cctz::utc_time_zone();
+ const absl::TimeZone tz(cz);
+ EXPECT_EQ(cz, cctz::time_zone(tz));
+}
+
+TEST(TimeZone, DefaultTimeZones) {
+ absl::TimeZone tz;
+ EXPECT_EQ("UTC", absl::TimeZone().name());
+ EXPECT_EQ("UTC", absl::UTCTimeZone().name());
+}
+
+TEST(TimeZone, FixedTimeZone) {
+ const absl::TimeZone tz = absl::FixedTimeZone(123);
+ const cctz::time_zone cz = cctz::fixed_time_zone(cctz::seconds(123));
+ EXPECT_EQ(tz, absl::TimeZone(cz));
+}
+
+TEST(TimeZone, LocalTimeZone) {
+ const absl::TimeZone local_tz = absl::LocalTimeZone();
+ absl::TimeZone tz = absl::time_internal::LoadTimeZone("localtime");
+ EXPECT_EQ(tz, local_tz);
+}
+
+TEST(TimeZone, NamedTimeZones) {
+ absl::TimeZone nyc = absl::time_internal::LoadTimeZone("America/New_York");
+ EXPECT_EQ("America/New_York", nyc.name());
+ absl::TimeZone syd = absl::time_internal::LoadTimeZone("Australia/Sydney");
+ EXPECT_EQ("Australia/Sydney", syd.name());
+ absl::TimeZone fixed = absl::FixedTimeZone((((3 * 60) + 25) * 60) + 45);
+ EXPECT_EQ("Fixed/UTC+03:25:45", fixed.name());
+}
+
+TEST(TimeZone, Failures) {
+ absl::TimeZone tz = absl::time_internal::LoadTimeZone("America/Los_Angeles");
+ EXPECT_FALSE(LoadTimeZone("Invalid/TimeZone", &tz));
+ EXPECT_EQ(absl::UTCTimeZone(), tz); // guaranteed fallback to UTC
+
+ // Ensures that the load still fails on a subsequent attempt.
+ tz = absl::time_internal::LoadTimeZone("America/Los_Angeles");
+ EXPECT_FALSE(LoadTimeZone("Invalid/TimeZone", &tz));
+ EXPECT_EQ(absl::UTCTimeZone(), tz); // guaranteed fallback to UTC
+
+ // Loading an empty string timezone should fail.
+ tz = absl::time_internal::LoadTimeZone("America/Los_Angeles");
+ EXPECT_FALSE(LoadTimeZone("", &tz));
+ EXPECT_EQ(absl::UTCTimeZone(), tz); // guaranteed fallback to UTC
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/types/BUILD.bazel b/third_party/abseil/src/absl/types/BUILD.bazel
new file mode 100644
index 0000000..83be936
--- /dev/null
+++ b/third_party/abseil/src/absl/types/BUILD.bazel
@@ -0,0 +1,336 @@
+#
+# Copyright 2017 The Abseil Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+load("@rules_cc//cc:defs.bzl", "cc_library", "cc_test")
+load(
+ "//absl:copts/configure_copts.bzl",
+ "ABSL_DEFAULT_COPTS",
+ "ABSL_DEFAULT_LINKOPTS",
+ "ABSL_TEST_COPTS",
+)
+
+package(default_visibility = ["//visibility:public"])
+
+licenses(["notice"])
+
+cc_library(
+ name = "any",
+ hdrs = ["any.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":bad_any_cast",
+ "//absl/base:config",
+ "//absl/base:core_headers",
+ "//absl/base:fast_type_id",
+ "//absl/meta:type_traits",
+ "//absl/utility",
+ ],
+)
+
+cc_library(
+ name = "bad_any_cast",
+ hdrs = ["bad_any_cast.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":bad_any_cast_impl",
+ "//absl/base:config",
+ ],
+)
+
+cc_library(
+ name = "bad_any_cast_impl",
+ srcs = [
+ "bad_any_cast.cc",
+ "bad_any_cast.h",
+ ],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ visibility = ["//visibility:private"],
+ deps = [
+ "//absl/base:config",
+ "//absl/base:raw_logging_internal",
+ ],
+)
+
+cc_test(
+ name = "any_test",
+ size = "small",
+ srcs = [
+ "any_test.cc",
+ ],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":any",
+ "//absl/base:config",
+ "//absl/base:exception_testing",
+ "//absl/base:raw_logging_internal",
+ "//absl/container:test_instance_tracker",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "any_exception_safety_test",
+ srcs = ["any_exception_safety_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":any",
+ "//absl/base:config",
+ "//absl/base:exception_safety_testing",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_library(
+ name = "span",
+ srcs = [
+ "internal/span.h",
+ ],
+ hdrs = [
+ "span.h",
+ ],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ "//absl/algorithm",
+ "//absl/base:core_headers",
+ "//absl/base:throw_delegate",
+ "//absl/meta:type_traits",
+ ],
+)
+
+cc_test(
+ name = "span_test",
+ size = "small",
+ srcs = ["span_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":span",
+ "//absl/base:config",
+ "//absl/base:core_headers",
+ "//absl/base:exception_testing",
+ "//absl/container:fixed_array",
+ "//absl/container:inlined_vector",
+ "//absl/hash:hash_testing",
+ "//absl/strings",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_library(
+ name = "optional",
+ srcs = ["internal/optional.h"],
+ hdrs = ["optional.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":bad_optional_access",
+ "//absl/base:base_internal",
+ "//absl/base:config",
+ "//absl/base:core_headers",
+ "//absl/memory",
+ "//absl/meta:type_traits",
+ "//absl/utility",
+ ],
+)
+
+cc_library(
+ name = "bad_optional_access",
+ srcs = ["bad_optional_access.cc"],
+ hdrs = ["bad_optional_access.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ "//absl/base:config",
+ "//absl/base:raw_logging_internal",
+ ],
+)
+
+cc_library(
+ name = "bad_variant_access",
+ srcs = ["bad_variant_access.cc"],
+ hdrs = ["bad_variant_access.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ "//absl/base:config",
+ "//absl/base:raw_logging_internal",
+ ],
+)
+
+cc_test(
+ name = "optional_test",
+ size = "small",
+ srcs = [
+ "optional_test.cc",
+ ],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":optional",
+ "//absl/base:config",
+ "//absl/base:raw_logging_internal",
+ "//absl/meta:type_traits",
+ "//absl/strings",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "optional_exception_safety_test",
+ srcs = [
+ "optional_exception_safety_test.cc",
+ ],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":optional",
+ "//absl/base:config",
+ "//absl/base:exception_safety_testing",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_library(
+ name = "conformance_testing",
+ testonly = 1,
+ hdrs = [
+ "internal/conformance_aliases.h",
+ "internal/conformance_archetype.h",
+ "internal/conformance_profile.h",
+ "internal/conformance_testing.h",
+ "internal/conformance_testing_helpers.h",
+ "internal/parentheses.h",
+ "internal/transform_args.h",
+ ],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ "//absl/algorithm:container",
+ "//absl/meta:type_traits",
+ "//absl/strings",
+ "//absl/utility",
+ "@com_google_googletest//:gtest",
+ ],
+)
+
+cc_test(
+ name = "conformance_testing_test",
+ size = "small",
+ srcs = [
+ "internal/conformance_testing_test.cc",
+ ],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":conformance_testing",
+ "//absl/meta:type_traits",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_library(
+ name = "variant",
+ srcs = ["internal/variant.h"],
+ hdrs = ["variant.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":bad_variant_access",
+ "//absl/base:base_internal",
+ "//absl/base:config",
+ "//absl/base:core_headers",
+ "//absl/meta:type_traits",
+ "//absl/utility",
+ ],
+)
+
+cc_test(
+ name = "variant_test",
+ size = "small",
+ srcs = ["variant_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":variant",
+ "//absl/base:config",
+ "//absl/base:core_headers",
+ "//absl/memory",
+ "//absl/meta:type_traits",
+ "//absl/strings",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "variant_benchmark",
+ srcs = [
+ "variant_benchmark.cc",
+ ],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ tags = ["benchmark"],
+ deps = [
+ ":variant",
+ "//absl/utility",
+ "@com_github_google_benchmark//:benchmark_main",
+ ],
+)
+
+cc_test(
+ name = "variant_exception_safety_test",
+ size = "small",
+ srcs = [
+ "variant_exception_safety_test.cc",
+ ],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":variant",
+ "//absl/base:config",
+ "//absl/base:exception_safety_testing",
+ "//absl/memory",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_library(
+ name = "compare",
+ hdrs = ["compare.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ deps = [
+ "//absl/base:core_headers",
+ "//absl/meta:type_traits",
+ ],
+)
+
+cc_test(
+ name = "compare_test",
+ size = "small",
+ srcs = [
+ "compare_test.cc",
+ ],
+ copts = ABSL_TEST_COPTS,
+ deps = [
+ ":compare",
+ "//absl/base",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
diff --git a/third_party/abseil/src/absl/types/CMakeLists.txt b/third_party/abseil/src/absl/types/CMakeLists.txt
new file mode 100644
index 0000000..3f99ad8
--- /dev/null
+++ b/third_party/abseil/src/absl/types/CMakeLists.txt
@@ -0,0 +1,373 @@
+#
+# Copyright 2017 The Abseil Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+absl_cc_library(
+ NAME
+ any
+ HDRS
+ "any.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::bad_any_cast
+ absl::config
+ absl::core_headers
+ absl::fast_type_id
+ absl::type_traits
+ absl::utility
+ PUBLIC
+)
+
+absl_cc_library(
+ NAME
+ bad_any_cast
+ HDRS
+ "bad_any_cast.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::bad_any_cast_impl
+ absl::config
+ PUBLIC
+)
+
+absl_cc_library(
+ NAME
+ bad_any_cast_impl
+ SRCS
+ "bad_any_cast.h"
+ "bad_any_cast.cc"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::config
+ absl::raw_logging_internal
+)
+
+absl_cc_test(
+ NAME
+ any_test
+ SRCS
+ "any_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::any
+ absl::config
+ absl::exception_testing
+ absl::raw_logging_internal
+ absl::test_instance_tracker
+ gmock_main
+)
+
+absl_cc_test(
+ NAME
+ any_test_noexceptions
+ SRCS
+ "any_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::any
+ absl::config
+ absl::exception_testing
+ absl::raw_logging_internal
+ absl::test_instance_tracker
+ gmock_main
+)
+
+absl_cc_test(
+ NAME
+ any_exception_safety_test
+ SRCS
+ "any_exception_safety_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::any
+ absl::config
+ absl::exception_safety_testing
+ gmock_main
+)
+
+absl_cc_library(
+ NAME
+ span
+ HDRS
+ "span.h"
+ SRCS
+ "internal/span.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::algorithm
+ absl::core_headers
+ absl::throw_delegate
+ absl::type_traits
+ PUBLIC
+)
+
+absl_cc_test(
+ NAME
+ span_test
+ SRCS
+ "span_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::span
+ absl::base
+ absl::config
+ absl::core_headers
+ absl::exception_testing
+ absl::fixed_array
+ absl::inlined_vector
+ absl::hash_testing
+ absl::strings
+ gmock_main
+)
+
+absl_cc_test(
+ NAME
+ span_test_noexceptions
+ SRCS
+ "span_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::span
+ absl::base
+ absl::config
+ absl::core_headers
+ absl::exception_testing
+ absl::fixed_array
+ absl::inlined_vector
+ absl::hash_testing
+ absl::strings
+ gmock_main
+)
+
+absl_cc_library(
+ NAME
+ optional
+ HDRS
+ "optional.h"
+ SRCS
+ "internal/optional.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::bad_optional_access
+ absl::base_internal
+ absl::config
+ absl::core_headers
+ absl::memory
+ absl::type_traits
+ absl::utility
+ PUBLIC
+)
+
+absl_cc_library(
+ NAME
+ bad_optional_access
+ HDRS
+ "bad_optional_access.h"
+ SRCS
+ "bad_optional_access.cc"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::config
+ absl::raw_logging_internal
+ PUBLIC
+)
+
+absl_cc_library(
+ NAME
+ bad_variant_access
+ HDRS
+ "bad_variant_access.h"
+ SRCS
+ "bad_variant_access.cc"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::config
+ absl::raw_logging_internal
+ PUBLIC
+)
+
+absl_cc_test(
+ NAME
+ optional_test
+ SRCS
+ "optional_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::optional
+ absl::config
+ absl::raw_logging_internal
+ absl::strings
+ absl::type_traits
+ gmock_main
+)
+
+absl_cc_test(
+ NAME
+ optional_exception_safety_test
+ SRCS
+ "optional_exception_safety_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::optional
+ absl::config
+ absl::exception_safety_testing
+ gmock_main
+)
+
+absl_cc_library(
+ NAME
+ conformance_testing
+ HDRS
+ "internal/conformance_aliases.h"
+ "internal/conformance_archetype.h"
+ "internal/conformance_profile.h"
+ "internal/conformance_testing.h"
+ "internal/conformance_testing_helpers.h"
+ "internal/parentheses.h"
+ "internal/transform_args.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::algorithm
+ absl::debugging
+ absl::type_traits
+ absl::strings
+ absl::utility
+ gmock_main
+ TESTONLY
+)
+
+absl_cc_test(
+ NAME
+ conformance_testing_test
+ SRCS
+ "internal/conformance_testing_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ ${ABSL_EXCEPTIONS_FLAG}
+ LINKOPTS
+ ${ABSL_EXCEPTIONS_FLAG_LINKOPTS}
+ DEPS
+ absl::conformance_testing
+ absl::type_traits
+ gmock_main
+)
+
+absl_cc_test(
+ NAME
+ conformance_testing_test_no_exceptions
+ SRCS
+ "internal/conformance_testing_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::conformance_testing
+ absl::type_traits
+ gmock_main
+)
+
+absl_cc_library(
+ NAME
+ variant
+ HDRS
+ "variant.h"
+ SRCS
+ "internal/variant.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::bad_variant_access
+ absl::base_internal
+ absl::config
+ absl::core_headers
+ absl::type_traits
+ absl::utility
+ PUBLIC
+)
+
+absl_cc_test(
+ NAME
+ variant_test
+ SRCS
+ "variant_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::variant
+ absl::config
+ absl::core_headers
+ absl::memory
+ absl::type_traits
+ absl::strings
+ gmock_main
+)
+
+absl_cc_library(
+ NAME
+ compare
+ HDRS
+ "compare.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::core_headers
+ absl::type_traits
+ PUBLIC
+)
+
+absl_cc_test(
+ NAME
+ compare_test
+ SRCS
+ "compare_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::base
+ absl::compare
+ gmock_main
+)
+
+# TODO(cohenjon,zhangxy) Figure out why this test is failing on gcc 4.8
+if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU" AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.9)
+else()
+absl_cc_test(
+ NAME
+ variant_exception_safety_test
+ SRCS
+ "variant_exception_safety_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::variant
+ absl::config
+ absl::exception_safety_testing
+ absl::memory
+ gmock_main
+)
+endif()
diff --git a/third_party/abseil/src/absl/types/any.h b/third_party/abseil/src/absl/types/any.h
new file mode 100644
index 0000000..fc5a074
--- /dev/null
+++ b/third_party/abseil/src/absl/types/any.h
@@ -0,0 +1,528 @@
+//
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// any.h
+// -----------------------------------------------------------------------------
+//
+// This header file define the `absl::any` type for holding a type-safe value
+// of any type. The 'absl::any` type is useful for providing a way to hold
+// something that is, as yet, unspecified. Such unspecified types
+// traditionally are passed between API boundaries until they are later cast to
+// their "destination" types. To cast to such a destination type, use
+// `absl::any_cast()`. Note that when casting an `absl::any`, you must cast it
+// to an explicit type; implicit conversions will throw.
+//
+// Example:
+//
+// auto a = absl::any(65);
+// absl::any_cast<int>(a); // 65
+// absl::any_cast<char>(a); // throws absl::bad_any_cast
+// absl::any_cast<std::string>(a); // throws absl::bad_any_cast
+//
+// `absl::any` is a C++11 compatible version of the C++17 `std::any` abstraction
+// and is designed to be a drop-in replacement for code compliant with C++17.
+//
+// Traditionally, the behavior of casting to a temporary unspecified type has
+// been accomplished with the `void *` paradigm, where the pointer was to some
+// other unspecified type. `absl::any` provides an "owning" version of `void *`
+// that avoids issues of pointer management.
+//
+// Note: just as in the case of `void *`, use of `absl::any` (and its C++17
+// version `std::any`) is a code smell indicating that your API might not be
+// constructed correctly. We have seen that most uses of `any` are unwarranted,
+// and `absl::any`, like `std::any`, is difficult to use properly. Before using
+// this abstraction, make sure that you should not instead be rewriting your
+// code to be more specific.
+//
+// Abseil has also released an `absl::variant` type (a C++11 compatible version
+// of the C++17 `std::variant`), which is generally preferred for use over
+// `absl::any`.
+#ifndef ABSL_TYPES_ANY_H_
+#define ABSL_TYPES_ANY_H_
+
+#include "absl/base/config.h"
+#include "absl/utility/utility.h"
+
+#ifdef ABSL_USES_STD_ANY
+
+#include <any> // IWYU pragma: export
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+using std::any;
+using std::any_cast;
+using std::bad_any_cast;
+using std::make_any;
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#else // ABSL_USES_STD_ANY
+
+#include <algorithm>
+#include <cstddef>
+#include <initializer_list>
+#include <memory>
+#include <stdexcept>
+#include <type_traits>
+#include <typeinfo>
+#include <utility>
+
+#include "absl/base/internal/fast_type_id.h"
+#include "absl/base/macros.h"
+#include "absl/meta/type_traits.h"
+#include "absl/types/bad_any_cast.h"
+
+// NOTE: This macro is an implementation detail that is undefined at the bottom
+// of the file. It is not intended for expansion directly from user code.
+#ifdef ABSL_ANY_DETAIL_HAS_RTTI
+#error ABSL_ANY_DETAIL_HAS_RTTI cannot be directly set
+#elif !defined(__GNUC__) || defined(__GXX_RTTI)
+#define ABSL_ANY_DETAIL_HAS_RTTI 1
+#endif // !defined(__GNUC__) || defined(__GXX_RTTI)
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+class any;
+
+// swap()
+//
+// Swaps two `absl::any` values. Equivalent to `x.swap(y) where `x` and `y` are
+// `absl::any` types.
+void swap(any& x, any& y) noexcept;
+
+// make_any()
+//
+// Constructs an `absl::any` of type `T` with the given arguments.
+template <typename T, typename... Args>
+any make_any(Args&&... args);
+
+// Overload of `absl::make_any()` for constructing an `absl::any` type from an
+// initializer list.
+template <typename T, typename U, typename... Args>
+any make_any(std::initializer_list<U> il, Args&&... args);
+
+// any_cast()
+//
+// Statically casts the value of a `const absl::any` type to the given type.
+// This function will throw `absl::bad_any_cast` if the stored value type of the
+// `absl::any` does not match the cast.
+//
+// `any_cast()` can also be used to get a reference to the internal storage iff
+// a reference type is passed as its `ValueType`:
+//
+// Example:
+//
+// absl::any my_any = std::vector<int>();
+// absl::any_cast<std::vector<int>&>(my_any).push_back(42);
+template <typename ValueType>
+ValueType any_cast(const any& operand);
+
+// Overload of `any_cast()` to statically cast the value of a non-const
+// `absl::any` type to the given type. This function will throw
+// `absl::bad_any_cast` if the stored value type of the `absl::any` does not
+// match the cast.
+template <typename ValueType>
+ValueType any_cast(any& operand); // NOLINT(runtime/references)
+
+// Overload of `any_cast()` to statically cast the rvalue of an `absl::any`
+// type. This function will throw `absl::bad_any_cast` if the stored value type
+// of the `absl::any` does not match the cast.
+template <typename ValueType>
+ValueType any_cast(any&& operand);
+
+// Overload of `any_cast()` to statically cast the value of a const pointer
+// `absl::any` type to the given pointer type, or `nullptr` if the stored value
+// type of the `absl::any` does not match the cast.
+template <typename ValueType>
+const ValueType* any_cast(const any* operand) noexcept;
+
+// Overload of `any_cast()` to statically cast the value of a pointer
+// `absl::any` type to the given pointer type, or `nullptr` if the stored value
+// type of the `absl::any` does not match the cast.
+template <typename ValueType>
+ValueType* any_cast(any* operand) noexcept;
+
+// -----------------------------------------------------------------------------
+// absl::any
+// -----------------------------------------------------------------------------
+//
+// An `absl::any` object provides the facility to either store an instance of a
+// type, known as the "contained object", or no value. An `absl::any` is used to
+// store values of types that are unknown at compile time. The `absl::any`
+// object, when containing a value, must contain a value type; storing a
+// reference type is neither desired nor supported.
+//
+// An `absl::any` can only store a type that is copy-constructible; move-only
+// types are not allowed within an `any` object.
+//
+// Example:
+//
+// auto a = absl::any(65); // Literal, copyable
+// auto b = absl::any(std::vector<int>()); // Default-initialized, copyable
+// std::unique_ptr<Foo> my_foo;
+// auto c = absl::any(std::move(my_foo)); // Error, not copy-constructible
+//
+// Note that `absl::any` makes use of decayed types (`absl::decay_t` in this
+// context) to remove const-volatile qualifiers (known as "cv qualifiers"),
+// decay functions to function pointers, etc. We essentially "decay" a given
+// type into its essential type.
+//
+// `absl::any` makes use of decayed types when determining the basic type `T` of
+// the value to store in the any's contained object. In the documentation below,
+// we explicitly denote this by using the phrase "a decayed type of `T`".
+//
+// Example:
+//
+// const int a = 4;
+// absl::any foo(a); // Decay ensures we store an "int", not a "const int&".
+//
+// void my_function() {}
+// absl::any bar(my_function); // Decay ensures we store a function pointer.
+//
+// `absl::any` is a C++11 compatible version of the C++17 `std::any` abstraction
+// and is designed to be a drop-in replacement for code compliant with C++17.
+class any {
+ private:
+ template <typename T>
+ struct IsInPlaceType;
+
+ public:
+ // Constructors
+
+ // Constructs an empty `absl::any` object (`any::has_value()` will return
+ // `false`).
+ constexpr any() noexcept;
+
+ // Copy constructs an `absl::any` object with a "contained object" of the
+ // passed type of `other` (or an empty `absl::any` if `other.has_value()` is
+ // `false`.
+ any(const any& other)
+ : obj_(other.has_value() ? other.obj_->Clone()
+ : std::unique_ptr<ObjInterface>()) {}
+
+ // Move constructs an `absl::any` object with a "contained object" of the
+ // passed type of `other` (or an empty `absl::any` if `other.has_value()` is
+ // `false`).
+ any(any&& other) noexcept = default;
+
+ // Constructs an `absl::any` object with a "contained object" of the decayed
+ // type of `T`, which is initialized via `std::forward<T>(value)`.
+ //
+ // This constructor will not participate in overload resolution if the
+ // decayed type of `T` is not copy-constructible.
+ template <
+ typename T, typename VT = absl::decay_t<T>,
+ absl::enable_if_t<!absl::disjunction<
+ std::is_same<any, VT>, IsInPlaceType<VT>,
+ absl::negation<std::is_copy_constructible<VT> > >::value>* = nullptr>
+ any(T&& value) : obj_(new Obj<VT>(in_place, std::forward<T>(value))) {}
+
+ // Constructs an `absl::any` object with a "contained object" of the decayed
+ // type of `T`, which is initialized via `std::forward<T>(value)`.
+ template <typename T, typename... Args, typename VT = absl::decay_t<T>,
+ absl::enable_if_t<absl::conjunction<
+ std::is_copy_constructible<VT>,
+ std::is_constructible<VT, Args...>>::value>* = nullptr>
+ explicit any(in_place_type_t<T> /*tag*/, Args&&... args)
+ : obj_(new Obj<VT>(in_place, std::forward<Args>(args)...)) {}
+
+ // Constructs an `absl::any` object with a "contained object" of the passed
+ // type `VT` as a decayed type of `T`. `VT` is initialized as if
+ // direct-non-list-initializing an object of type `VT` with the arguments
+ // `initializer_list, std::forward<Args>(args)...`.
+ template <
+ typename T, typename U, typename... Args, typename VT = absl::decay_t<T>,
+ absl::enable_if_t<
+ absl::conjunction<std::is_copy_constructible<VT>,
+ std::is_constructible<VT, std::initializer_list<U>&,
+ Args...>>::value>* = nullptr>
+ explicit any(in_place_type_t<T> /*tag*/, std::initializer_list<U> ilist,
+ Args&&... args)
+ : obj_(new Obj<VT>(in_place, ilist, std::forward<Args>(args)...)) {}
+
+ // Assignment operators
+
+ // Copy assigns an `absl::any` object with a "contained object" of the
+ // passed type.
+ any& operator=(const any& rhs) {
+ any(rhs).swap(*this);
+ return *this;
+ }
+
+ // Move assigns an `absl::any` object with a "contained object" of the
+ // passed type. `rhs` is left in a valid but otherwise unspecified state.
+ any& operator=(any&& rhs) noexcept {
+ any(std::move(rhs)).swap(*this);
+ return *this;
+ }
+
+ // Assigns an `absl::any` object with a "contained object" of the passed type.
+ template <typename T, typename VT = absl::decay_t<T>,
+ absl::enable_if_t<absl::conjunction<
+ absl::negation<std::is_same<VT, any>>,
+ std::is_copy_constructible<VT>>::value>* = nullptr>
+ any& operator=(T&& rhs) {
+ any tmp(in_place_type_t<VT>(), std::forward<T>(rhs));
+ tmp.swap(*this);
+ return *this;
+ }
+
+ // Modifiers
+
+ // any::emplace()
+ //
+ // Emplaces a value within an `absl::any` object by calling `any::reset()`,
+ // initializing the contained value as if direct-non-list-initializing an
+ // object of type `VT` with the arguments `std::forward<Args>(args)...`, and
+ // returning a reference to the new contained value.
+ //
+ // Note: If an exception is thrown during the call to `VT`'s constructor,
+ // `*this` does not contain a value, and any previously contained value has
+ // been destroyed.
+ template <
+ typename T, typename... Args, typename VT = absl::decay_t<T>,
+ absl::enable_if_t<std::is_copy_constructible<VT>::value &&
+ std::is_constructible<VT, Args...>::value>* = nullptr>
+ VT& emplace(Args&&... args) {
+ reset(); // NOTE: reset() is required here even in the world of exceptions.
+ Obj<VT>* const object_ptr =
+ new Obj<VT>(in_place, std::forward<Args>(args)...);
+ obj_ = std::unique_ptr<ObjInterface>(object_ptr);
+ return object_ptr->value;
+ }
+
+ // Overload of `any::emplace()` to emplace a value within an `absl::any`
+ // object by calling `any::reset()`, initializing the contained value as if
+ // direct-non-list-initializing an object of type `VT` with the arguments
+ // `initializer_list, std::forward<Args>(args)...`, and returning a reference
+ // to the new contained value.
+ //
+ // Note: If an exception is thrown during the call to `VT`'s constructor,
+ // `*this` does not contain a value, and any previously contained value has
+ // been destroyed. The function shall not participate in overload resolution
+ // unless `is_copy_constructible_v<VT>` is `true` and
+ // `is_constructible_v<VT, initializer_list<U>&, Args...>` is `true`.
+ template <
+ typename T, typename U, typename... Args, typename VT = absl::decay_t<T>,
+ absl::enable_if_t<std::is_copy_constructible<VT>::value &&
+ std::is_constructible<VT, std::initializer_list<U>&,
+ Args...>::value>* = nullptr>
+ VT& emplace(std::initializer_list<U> ilist, Args&&... args) {
+ reset(); // NOTE: reset() is required here even in the world of exceptions.
+ Obj<VT>* const object_ptr =
+ new Obj<VT>(in_place, ilist, std::forward<Args>(args)...);
+ obj_ = std::unique_ptr<ObjInterface>(object_ptr);
+ return object_ptr->value;
+ }
+
+ // any::reset()
+ //
+ // Resets the state of the `absl::any` object, destroying the contained object
+ // if present.
+ void reset() noexcept { obj_ = nullptr; }
+
+ // any::swap()
+ //
+ // Swaps the passed value and the value of this `absl::any` object.
+ void swap(any& other) noexcept { obj_.swap(other.obj_); }
+
+ // Observers
+
+ // any::has_value()
+ //
+ // Returns `true` if the `any` object has a contained value, otherwise
+ // returns `false`.
+ bool has_value() const noexcept { return obj_ != nullptr; }
+
+#if ABSL_ANY_DETAIL_HAS_RTTI
+ // Returns: typeid(T) if *this has a contained object of type T, otherwise
+ // typeid(void).
+ const std::type_info& type() const noexcept {
+ if (has_value()) {
+ return obj_->Type();
+ }
+
+ return typeid(void);
+ }
+#endif // ABSL_ANY_DETAIL_HAS_RTTI
+
+ private:
+ // Tagged type-erased abstraction for holding a cloneable object.
+ class ObjInterface {
+ public:
+ virtual ~ObjInterface() = default;
+ virtual std::unique_ptr<ObjInterface> Clone() const = 0;
+ virtual const void* ObjTypeId() const noexcept = 0;
+#if ABSL_ANY_DETAIL_HAS_RTTI
+ virtual const std::type_info& Type() const noexcept = 0;
+#endif // ABSL_ANY_DETAIL_HAS_RTTI
+ };
+
+ // Hold a value of some queryable type, with an ability to Clone it.
+ template <typename T>
+ class Obj : public ObjInterface {
+ public:
+ template <typename... Args>
+ explicit Obj(in_place_t /*tag*/, Args&&... args)
+ : value(std::forward<Args>(args)...) {}
+
+ std::unique_ptr<ObjInterface> Clone() const final {
+ return std::unique_ptr<ObjInterface>(new Obj(in_place, value));
+ }
+
+ const void* ObjTypeId() const noexcept final { return IdForType<T>(); }
+
+#if ABSL_ANY_DETAIL_HAS_RTTI
+ const std::type_info& Type() const noexcept final { return typeid(T); }
+#endif // ABSL_ANY_DETAIL_HAS_RTTI
+
+ T value;
+ };
+
+ std::unique_ptr<ObjInterface> CloneObj() const {
+ if (!obj_) return nullptr;
+ return obj_->Clone();
+ }
+
+ template <typename T>
+ constexpr static const void* IdForType() {
+ // Note: This type dance is to make the behavior consistent with typeid.
+ using NormalizedType =
+ typename std::remove_cv<typename std::remove_reference<T>::type>::type;
+
+ return base_internal::FastTypeId<NormalizedType>();
+ }
+
+ const void* GetObjTypeId() const {
+ return obj_ ? obj_->ObjTypeId() : base_internal::FastTypeId<void>();
+ }
+
+ // `absl::any` nonmember functions //
+
+ // Description at the declaration site (top of file).
+ template <typename ValueType>
+ friend ValueType any_cast(const any& operand);
+
+ // Description at the declaration site (top of file).
+ template <typename ValueType>
+ friend ValueType any_cast(any& operand); // NOLINT(runtime/references)
+
+ // Description at the declaration site (top of file).
+ template <typename T>
+ friend const T* any_cast(const any* operand) noexcept;
+
+ // Description at the declaration site (top of file).
+ template <typename T>
+ friend T* any_cast(any* operand) noexcept;
+
+ std::unique_ptr<ObjInterface> obj_;
+};
+
+// -----------------------------------------------------------------------------
+// Implementation Details
+// -----------------------------------------------------------------------------
+
+constexpr any::any() noexcept = default;
+
+template <typename T>
+struct any::IsInPlaceType : std::false_type {};
+
+template <typename T>
+struct any::IsInPlaceType<in_place_type_t<T>> : std::true_type {};
+
+inline void swap(any& x, any& y) noexcept { x.swap(y); }
+
+// Description at the declaration site (top of file).
+template <typename T, typename... Args>
+any make_any(Args&&... args) {
+ return any(in_place_type_t<T>(), std::forward<Args>(args)...);
+}
+
+// Description at the declaration site (top of file).
+template <typename T, typename U, typename... Args>
+any make_any(std::initializer_list<U> il, Args&&... args) {
+ return any(in_place_type_t<T>(), il, std::forward<Args>(args)...);
+}
+
+// Description at the declaration site (top of file).
+template <typename ValueType>
+ValueType any_cast(const any& operand) {
+ using U = typename std::remove_cv<
+ typename std::remove_reference<ValueType>::type>::type;
+ static_assert(std::is_constructible<ValueType, const U&>::value,
+ "Invalid ValueType");
+ auto* const result = (any_cast<U>)(&operand);
+ if (result == nullptr) {
+ any_internal::ThrowBadAnyCast();
+ }
+ return static_cast<ValueType>(*result);
+}
+
+// Description at the declaration site (top of file).
+template <typename ValueType>
+ValueType any_cast(any& operand) { // NOLINT(runtime/references)
+ using U = typename std::remove_cv<
+ typename std::remove_reference<ValueType>::type>::type;
+ static_assert(std::is_constructible<ValueType, U&>::value,
+ "Invalid ValueType");
+ auto* result = (any_cast<U>)(&operand);
+ if (result == nullptr) {
+ any_internal::ThrowBadAnyCast();
+ }
+ return static_cast<ValueType>(*result);
+}
+
+// Description at the declaration site (top of file).
+template <typename ValueType>
+ValueType any_cast(any&& operand) {
+ using U = typename std::remove_cv<
+ typename std::remove_reference<ValueType>::type>::type;
+ static_assert(std::is_constructible<ValueType, U>::value,
+ "Invalid ValueType");
+ return static_cast<ValueType>(std::move((any_cast<U&>)(operand)));
+}
+
+// Description at the declaration site (top of file).
+template <typename T>
+const T* any_cast(const any* operand) noexcept {
+ using U =
+ typename std::remove_cv<typename std::remove_reference<T>::type>::type;
+ return operand && operand->GetObjTypeId() == any::IdForType<U>()
+ ? std::addressof(
+ static_cast<const any::Obj<U>*>(operand->obj_.get())->value)
+ : nullptr;
+}
+
+// Description at the declaration site (top of file).
+template <typename T>
+T* any_cast(any* operand) noexcept {
+ using U =
+ typename std::remove_cv<typename std::remove_reference<T>::type>::type;
+ return operand && operand->GetObjTypeId() == any::IdForType<U>()
+ ? std::addressof(
+ static_cast<any::Obj<U>*>(operand->obj_.get())->value)
+ : nullptr;
+}
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#undef ABSL_ANY_DETAIL_HAS_RTTI
+
+#endif // ABSL_USES_STD_ANY
+
+#endif // ABSL_TYPES_ANY_H_
diff --git a/third_party/abseil/src/absl/types/any_exception_safety_test.cc b/third_party/abseil/src/absl/types/any_exception_safety_test.cc
new file mode 100644
index 0000000..31c1140
--- /dev/null
+++ b/third_party/abseil/src/absl/types/any_exception_safety_test.cc
@@ -0,0 +1,173 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/types/any.h"
+
+#include "absl/base/config.h"
+
+// This test is a no-op when absl::any is an alias for std::any and when
+// exceptions are not enabled.
+#if !defined(ABSL_USES_STD_ANY) && defined(ABSL_HAVE_EXCEPTIONS)
+
+#include <typeinfo>
+#include <vector>
+
+#include "gtest/gtest.h"
+#include "absl/base/internal/exception_safety_testing.h"
+
+using Thrower = testing::ThrowingValue<>;
+using NoThrowMoveThrower =
+ testing::ThrowingValue<testing::TypeSpec::kNoThrowMove>;
+using ThrowerList = std::initializer_list<Thrower>;
+using ThrowerVec = std::vector<Thrower>;
+using ThrowingAlloc = testing::ThrowingAllocator<Thrower>;
+using ThrowingThrowerVec = std::vector<Thrower, ThrowingAlloc>;
+
+namespace {
+
+testing::AssertionResult AnyInvariants(absl::any* a) {
+ using testing::AssertionFailure;
+ using testing::AssertionSuccess;
+
+ if (a->has_value()) {
+ if (a->type() == typeid(void)) {
+ return AssertionFailure()
+ << "A non-empty any should not have type `void`";
+ }
+ } else {
+ if (a->type() != typeid(void)) {
+ return AssertionFailure()
+ << "An empty any should have type void, but has type "
+ << a->type().name();
+ }
+ }
+
+ // Make sure that reset() changes any to a valid state.
+ a->reset();
+ if (a->has_value()) {
+ return AssertionFailure() << "A reset `any` should be valueless";
+ }
+ if (a->type() != typeid(void)) {
+ return AssertionFailure() << "A reset `any` should have type() of `void`, "
+ "but instead has type "
+ << a->type().name();
+ }
+ try {
+ auto unused = absl::any_cast<Thrower>(*a);
+ static_cast<void>(unused);
+ return AssertionFailure()
+ << "A reset `any` should not be able to be any_cast";
+ } catch (const absl::bad_any_cast&) {
+ } catch (...) {
+ return AssertionFailure()
+ << "Unexpected exception thrown from absl::any_cast";
+ }
+ return AssertionSuccess();
+}
+
+testing::AssertionResult AnyIsEmpty(absl::any* a) {
+ if (!a->has_value()) {
+ return testing::AssertionSuccess();
+ }
+ return testing::AssertionFailure()
+ << "a should be empty, but instead has value "
+ << absl::any_cast<Thrower>(*a).Get();
+}
+
+TEST(AnyExceptionSafety, Ctors) {
+ Thrower val(1);
+ testing::TestThrowingCtor<absl::any>(val);
+
+ Thrower copy(val);
+ testing::TestThrowingCtor<absl::any>(copy);
+
+ testing::TestThrowingCtor<absl::any>(absl::in_place_type_t<Thrower>(), 1);
+
+ testing::TestThrowingCtor<absl::any>(absl::in_place_type_t<ThrowerVec>(),
+ ThrowerList{val});
+
+ testing::TestThrowingCtor<absl::any,
+ absl::in_place_type_t<ThrowingThrowerVec>,
+ ThrowerList, ThrowingAlloc>(
+ absl::in_place_type_t<ThrowingThrowerVec>(), {val}, ThrowingAlloc());
+}
+
+TEST(AnyExceptionSafety, Assignment) {
+ auto original =
+ absl::any(absl::in_place_type_t<Thrower>(), 1, testing::nothrow_ctor);
+ auto any_is_strong = [original](absl::any* ap) {
+ return testing::AssertionResult(ap->has_value() &&
+ absl::any_cast<Thrower>(original) ==
+ absl::any_cast<Thrower>(*ap));
+ };
+ auto any_strong_tester = testing::MakeExceptionSafetyTester()
+ .WithInitialValue(original)
+ .WithContracts(AnyInvariants, any_is_strong);
+
+ Thrower val(2);
+ absl::any any_val(val);
+ NoThrowMoveThrower mv_val(2);
+
+ auto assign_any = [&any_val](absl::any* ap) { *ap = any_val; };
+ auto assign_val = [&val](absl::any* ap) { *ap = val; };
+ auto move = [&val](absl::any* ap) { *ap = std::move(val); };
+ auto move_movable = [&mv_val](absl::any* ap) { *ap = std::move(mv_val); };
+
+ EXPECT_TRUE(any_strong_tester.Test(assign_any));
+ EXPECT_TRUE(any_strong_tester.Test(assign_val));
+ EXPECT_TRUE(any_strong_tester.Test(move));
+ EXPECT_TRUE(any_strong_tester.Test(move_movable));
+
+ auto empty_any_is_strong = [](absl::any* ap) {
+ return testing::AssertionResult{!ap->has_value()};
+ };
+ auto strong_empty_any_tester =
+ testing::MakeExceptionSafetyTester()
+ .WithInitialValue(absl::any{})
+ .WithContracts(AnyInvariants, empty_any_is_strong);
+
+ EXPECT_TRUE(strong_empty_any_tester.Test(assign_any));
+ EXPECT_TRUE(strong_empty_any_tester.Test(assign_val));
+ EXPECT_TRUE(strong_empty_any_tester.Test(move));
+}
+
+TEST(AnyExceptionSafety, Emplace) {
+ auto initial_val =
+ absl::any{absl::in_place_type_t<Thrower>(), 1, testing::nothrow_ctor};
+ auto one_tester = testing::MakeExceptionSafetyTester()
+ .WithInitialValue(initial_val)
+ .WithContracts(AnyInvariants, AnyIsEmpty);
+
+ auto emp_thrower = [](absl::any* ap) { ap->emplace<Thrower>(2); };
+ auto emp_throwervec = [](absl::any* ap) {
+ std::initializer_list<Thrower> il{Thrower(2, testing::nothrow_ctor)};
+ ap->emplace<ThrowerVec>(il);
+ };
+ auto emp_movethrower = [](absl::any* ap) {
+ ap->emplace<NoThrowMoveThrower>(2);
+ };
+
+ EXPECT_TRUE(one_tester.Test(emp_thrower));
+ EXPECT_TRUE(one_tester.Test(emp_throwervec));
+ EXPECT_TRUE(one_tester.Test(emp_movethrower));
+
+ auto empty_tester = one_tester.WithInitialValue(absl::any{});
+
+ EXPECT_TRUE(empty_tester.Test(emp_thrower));
+ EXPECT_TRUE(empty_tester.Test(emp_throwervec));
+}
+
+} // namespace
+
+#endif // #if !defined(ABSL_USES_STD_ANY) && defined(ABSL_HAVE_EXCEPTIONS)
diff --git a/third_party/abseil/src/absl/types/any_test.cc b/third_party/abseil/src/absl/types/any_test.cc
new file mode 100644
index 0000000..70e4ba2
--- /dev/null
+++ b/third_party/abseil/src/absl/types/any_test.cc
@@ -0,0 +1,781 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/types/any.h"
+
+// This test is a no-op when absl::any is an alias for std::any.
+#if !defined(ABSL_USES_STD_ANY)
+
+#include <initializer_list>
+#include <type_traits>
+#include <utility>
+#include <vector>
+
+#include "gtest/gtest.h"
+#include "absl/base/config.h"
+#include "absl/base/internal/exception_testing.h"
+#include "absl/base/internal/raw_logging.h"
+#include "absl/container/internal/test_instance_tracker.h"
+
+namespace {
+using absl::test_internal::CopyableOnlyInstance;
+using absl::test_internal::InstanceTracker;
+
+template <typename T>
+const T& AsConst(const T& t) {
+ return t;
+}
+
+struct MoveOnly {
+ MoveOnly() = default;
+ explicit MoveOnly(int value) : value(value) {}
+ MoveOnly(MoveOnly&&) = default;
+ MoveOnly& operator=(MoveOnly&&) = default;
+
+ int value = 0;
+};
+
+struct CopyOnly {
+ CopyOnly() = default;
+ explicit CopyOnly(int value) : value(value) {}
+ CopyOnly(CopyOnly&&) = delete;
+ CopyOnly& operator=(CopyOnly&&) = delete;
+ CopyOnly(const CopyOnly&) = default;
+ CopyOnly& operator=(const CopyOnly&) = default;
+
+ int value = 0;
+};
+
+struct MoveOnlyWithListConstructor {
+ MoveOnlyWithListConstructor() = default;
+ explicit MoveOnlyWithListConstructor(std::initializer_list<int> /*ilist*/,
+ int value)
+ : value(value) {}
+ MoveOnlyWithListConstructor(MoveOnlyWithListConstructor&&) = default;
+ MoveOnlyWithListConstructor& operator=(MoveOnlyWithListConstructor&&) =
+ default;
+
+ int value = 0;
+};
+
+struct IntMoveOnlyCopyOnly {
+ IntMoveOnlyCopyOnly(int value, MoveOnly /*move_only*/, CopyOnly /*copy_only*/)
+ : value(value) {}
+
+ int value;
+};
+
+struct ListMoveOnlyCopyOnly {
+ ListMoveOnlyCopyOnly(std::initializer_list<int> ilist, MoveOnly /*move_only*/,
+ CopyOnly /*copy_only*/)
+ : values(ilist) {}
+
+ std::vector<int> values;
+};
+
+using FunctionType = void();
+void FunctionToEmplace() {}
+
+using ArrayType = int[2];
+using DecayedArray = absl::decay_t<ArrayType>;
+
+TEST(AnyTest, Noexcept) {
+ static_assert(std::is_nothrow_default_constructible<absl::any>(), "");
+ static_assert(std::is_nothrow_move_constructible<absl::any>(), "");
+ static_assert(std::is_nothrow_move_assignable<absl::any>(), "");
+ static_assert(noexcept(std::declval<absl::any&>().has_value()), "");
+ static_assert(noexcept(std::declval<absl::any&>().type()), "");
+ static_assert(noexcept(absl::any_cast<int>(std::declval<absl::any*>())), "");
+ static_assert(
+ noexcept(std::declval<absl::any&>().swap(std::declval<absl::any&>())),
+ "");
+
+ using std::swap;
+ static_assert(
+ noexcept(swap(std::declval<absl::any&>(), std::declval<absl::any&>())),
+ "");
+}
+
+TEST(AnyTest, HasValue) {
+ absl::any o;
+ EXPECT_FALSE(o.has_value());
+ o.emplace<int>();
+ EXPECT_TRUE(o.has_value());
+ o.reset();
+ EXPECT_FALSE(o.has_value());
+}
+
+TEST(AnyTest, Type) {
+ absl::any o;
+ EXPECT_EQ(typeid(void), o.type());
+ o.emplace<int>(5);
+ EXPECT_EQ(typeid(int), o.type());
+ o.emplace<float>(5.f);
+ EXPECT_EQ(typeid(float), o.type());
+ o.reset();
+ EXPECT_EQ(typeid(void), o.type());
+}
+
+TEST(AnyTest, EmptyPointerCast) {
+ // pointer-to-unqualified overload
+ {
+ absl::any o;
+ EXPECT_EQ(nullptr, absl::any_cast<int>(&o));
+ o.emplace<int>();
+ EXPECT_NE(nullptr, absl::any_cast<int>(&o));
+ o.reset();
+ EXPECT_EQ(nullptr, absl::any_cast<int>(&o));
+ }
+
+ // pointer-to-const overload
+ {
+ absl::any o;
+ EXPECT_EQ(nullptr, absl::any_cast<int>(&AsConst(o)));
+ o.emplace<int>();
+ EXPECT_NE(nullptr, absl::any_cast<int>(&AsConst(o)));
+ o.reset();
+ EXPECT_EQ(nullptr, absl::any_cast<int>(&AsConst(o)));
+ }
+}
+
+TEST(AnyTest, InPlaceConstruction) {
+ const CopyOnly copy_only{};
+ absl::any o(absl::in_place_type_t<IntMoveOnlyCopyOnly>(), 5, MoveOnly(),
+ copy_only);
+ IntMoveOnlyCopyOnly& v = absl::any_cast<IntMoveOnlyCopyOnly&>(o);
+ EXPECT_EQ(5, v.value);
+}
+
+TEST(AnyTest, InPlaceConstructionVariableTemplate) {
+ const CopyOnly copy_only{};
+ absl::any o(absl::in_place_type<IntMoveOnlyCopyOnly>, 5, MoveOnly(),
+ copy_only);
+ auto& v = absl::any_cast<IntMoveOnlyCopyOnly&>(o);
+ EXPECT_EQ(5, v.value);
+}
+
+TEST(AnyTest, InPlaceConstructionWithCV) {
+ const CopyOnly copy_only{};
+ absl::any o(absl::in_place_type_t<const volatile IntMoveOnlyCopyOnly>(), 5,
+ MoveOnly(), copy_only);
+ IntMoveOnlyCopyOnly& v = absl::any_cast<IntMoveOnlyCopyOnly&>(o);
+ EXPECT_EQ(5, v.value);
+}
+
+TEST(AnyTest, InPlaceConstructionWithCVVariableTemplate) {
+ const CopyOnly copy_only{};
+ absl::any o(absl::in_place_type<const volatile IntMoveOnlyCopyOnly>, 5,
+ MoveOnly(), copy_only);
+ auto& v = absl::any_cast<IntMoveOnlyCopyOnly&>(o);
+ EXPECT_EQ(5, v.value);
+}
+
+TEST(AnyTest, InPlaceConstructionWithFunction) {
+ absl::any o(absl::in_place_type_t<FunctionType>(), FunctionToEmplace);
+ FunctionType*& construction_result = absl::any_cast<FunctionType*&>(o);
+ EXPECT_EQ(&FunctionToEmplace, construction_result);
+}
+
+TEST(AnyTest, InPlaceConstructionWithFunctionVariableTemplate) {
+ absl::any o(absl::in_place_type<FunctionType>, FunctionToEmplace);
+ auto& construction_result = absl::any_cast<FunctionType*&>(o);
+ EXPECT_EQ(&FunctionToEmplace, construction_result);
+}
+
+TEST(AnyTest, InPlaceConstructionWithArray) {
+ ArrayType ar = {5, 42};
+ absl::any o(absl::in_place_type_t<ArrayType>(), ar);
+ DecayedArray& construction_result = absl::any_cast<DecayedArray&>(o);
+ EXPECT_EQ(&ar[0], construction_result);
+}
+
+TEST(AnyTest, InPlaceConstructionWithArrayVariableTemplate) {
+ ArrayType ar = {5, 42};
+ absl::any o(absl::in_place_type<ArrayType>, ar);
+ auto& construction_result = absl::any_cast<DecayedArray&>(o);
+ EXPECT_EQ(&ar[0], construction_result);
+}
+
+TEST(AnyTest, InPlaceConstructionIlist) {
+ const CopyOnly copy_only{};
+ absl::any o(absl::in_place_type_t<ListMoveOnlyCopyOnly>(), {1, 2, 3, 4},
+ MoveOnly(), copy_only);
+ ListMoveOnlyCopyOnly& v = absl::any_cast<ListMoveOnlyCopyOnly&>(o);
+ std::vector<int> expected_values = {1, 2, 3, 4};
+ EXPECT_EQ(expected_values, v.values);
+}
+
+TEST(AnyTest, InPlaceConstructionIlistVariableTemplate) {
+ const CopyOnly copy_only{};
+ absl::any o(absl::in_place_type<ListMoveOnlyCopyOnly>, {1, 2, 3, 4},
+ MoveOnly(), copy_only);
+ auto& v = absl::any_cast<ListMoveOnlyCopyOnly&>(o);
+ std::vector<int> expected_values = {1, 2, 3, 4};
+ EXPECT_EQ(expected_values, v.values);
+}
+
+TEST(AnyTest, InPlaceConstructionIlistWithCV) {
+ const CopyOnly copy_only{};
+ absl::any o(absl::in_place_type_t<const volatile ListMoveOnlyCopyOnly>(),
+ {1, 2, 3, 4}, MoveOnly(), copy_only);
+ ListMoveOnlyCopyOnly& v = absl::any_cast<ListMoveOnlyCopyOnly&>(o);
+ std::vector<int> expected_values = {1, 2, 3, 4};
+ EXPECT_EQ(expected_values, v.values);
+}
+
+TEST(AnyTest, InPlaceConstructionIlistWithCVVariableTemplate) {
+ const CopyOnly copy_only{};
+ absl::any o(absl::in_place_type<const volatile ListMoveOnlyCopyOnly>,
+ {1, 2, 3, 4}, MoveOnly(), copy_only);
+ auto& v = absl::any_cast<ListMoveOnlyCopyOnly&>(o);
+ std::vector<int> expected_values = {1, 2, 3, 4};
+ EXPECT_EQ(expected_values, v.values);
+}
+
+TEST(AnyTest, InPlaceNoArgs) {
+ absl::any o(absl::in_place_type_t<int>{});
+ EXPECT_EQ(0, absl::any_cast<int&>(o));
+}
+
+TEST(AnyTest, InPlaceNoArgsVariableTemplate) {
+ absl::any o(absl::in_place_type<int>);
+ EXPECT_EQ(0, absl::any_cast<int&>(o));
+}
+
+template <typename Enabler, typename T, typename... Args>
+struct CanEmplaceAnyImpl : std::false_type {};
+
+template <typename T, typename... Args>
+struct CanEmplaceAnyImpl<
+ absl::void_t<decltype(
+ std::declval<absl::any&>().emplace<T>(std::declval<Args>()...))>,
+ T, Args...> : std::true_type {};
+
+template <typename T, typename... Args>
+using CanEmplaceAny = CanEmplaceAnyImpl<void, T, Args...>;
+
+TEST(AnyTest, Emplace) {
+ const CopyOnly copy_only{};
+ absl::any o;
+ EXPECT_TRUE((std::is_same<decltype(o.emplace<IntMoveOnlyCopyOnly>(
+ 5, MoveOnly(), copy_only)),
+ IntMoveOnlyCopyOnly&>::value));
+ IntMoveOnlyCopyOnly& emplace_result =
+ o.emplace<IntMoveOnlyCopyOnly>(5, MoveOnly(), copy_only);
+ EXPECT_EQ(5, emplace_result.value);
+ IntMoveOnlyCopyOnly& v = absl::any_cast<IntMoveOnlyCopyOnly&>(o);
+ EXPECT_EQ(5, v.value);
+ EXPECT_EQ(&emplace_result, &v);
+
+ static_assert(!CanEmplaceAny<int, int, int>::value, "");
+ static_assert(!CanEmplaceAny<MoveOnly, MoveOnly>::value, "");
+}
+
+TEST(AnyTest, EmplaceWithCV) {
+ const CopyOnly copy_only{};
+ absl::any o;
+ EXPECT_TRUE(
+ (std::is_same<decltype(o.emplace<const volatile IntMoveOnlyCopyOnly>(
+ 5, MoveOnly(), copy_only)),
+ IntMoveOnlyCopyOnly&>::value));
+ IntMoveOnlyCopyOnly& emplace_result =
+ o.emplace<const volatile IntMoveOnlyCopyOnly>(5, MoveOnly(), copy_only);
+ EXPECT_EQ(5, emplace_result.value);
+ IntMoveOnlyCopyOnly& v = absl::any_cast<IntMoveOnlyCopyOnly&>(o);
+ EXPECT_EQ(5, v.value);
+ EXPECT_EQ(&emplace_result, &v);
+}
+
+TEST(AnyTest, EmplaceWithFunction) {
+ absl::any o;
+ EXPECT_TRUE(
+ (std::is_same<decltype(o.emplace<FunctionType>(FunctionToEmplace)),
+ FunctionType*&>::value));
+ FunctionType*& emplace_result = o.emplace<FunctionType>(FunctionToEmplace);
+ EXPECT_EQ(&FunctionToEmplace, emplace_result);
+}
+
+TEST(AnyTest, EmplaceWithArray) {
+ absl::any o;
+ ArrayType ar = {5, 42};
+ EXPECT_TRUE(
+ (std::is_same<decltype(o.emplace<ArrayType>(ar)), DecayedArray&>::value));
+ DecayedArray& emplace_result = o.emplace<ArrayType>(ar);
+ EXPECT_EQ(&ar[0], emplace_result);
+}
+
+TEST(AnyTest, EmplaceIlist) {
+ const CopyOnly copy_only{};
+ absl::any o;
+ EXPECT_TRUE((std::is_same<decltype(o.emplace<ListMoveOnlyCopyOnly>(
+ {1, 2, 3, 4}, MoveOnly(), copy_only)),
+ ListMoveOnlyCopyOnly&>::value));
+ ListMoveOnlyCopyOnly& emplace_result =
+ o.emplace<ListMoveOnlyCopyOnly>({1, 2, 3, 4}, MoveOnly(), copy_only);
+ ListMoveOnlyCopyOnly& v = absl::any_cast<ListMoveOnlyCopyOnly&>(o);
+ EXPECT_EQ(&v, &emplace_result);
+ std::vector<int> expected_values = {1, 2, 3, 4};
+ EXPECT_EQ(expected_values, v.values);
+
+ static_assert(!CanEmplaceAny<int, std::initializer_list<int>>::value, "");
+ static_assert(!CanEmplaceAny<MoveOnlyWithListConstructor,
+ std::initializer_list<int>, int>::value,
+ "");
+}
+
+TEST(AnyTest, EmplaceIlistWithCV) {
+ const CopyOnly copy_only{};
+ absl::any o;
+ EXPECT_TRUE(
+ (std::is_same<decltype(o.emplace<const volatile ListMoveOnlyCopyOnly>(
+ {1, 2, 3, 4}, MoveOnly(), copy_only)),
+ ListMoveOnlyCopyOnly&>::value));
+ ListMoveOnlyCopyOnly& emplace_result =
+ o.emplace<const volatile ListMoveOnlyCopyOnly>({1, 2, 3, 4}, MoveOnly(),
+ copy_only);
+ ListMoveOnlyCopyOnly& v = absl::any_cast<ListMoveOnlyCopyOnly&>(o);
+ EXPECT_EQ(&v, &emplace_result);
+ std::vector<int> expected_values = {1, 2, 3, 4};
+ EXPECT_EQ(expected_values, v.values);
+}
+
+TEST(AnyTest, EmplaceNoArgs) {
+ absl::any o;
+ o.emplace<int>();
+ EXPECT_EQ(0, absl::any_cast<int>(o));
+}
+
+TEST(AnyTest, ConversionConstruction) {
+ {
+ absl::any o = 5;
+ EXPECT_EQ(5, absl::any_cast<int>(o));
+ }
+
+ {
+ const CopyOnly copy_only(5);
+ absl::any o = copy_only;
+ EXPECT_EQ(5, absl::any_cast<CopyOnly&>(o).value);
+ }
+
+ static_assert(!std::is_convertible<MoveOnly, absl::any>::value, "");
+}
+
+TEST(AnyTest, ConversionAssignment) {
+ {
+ absl::any o;
+ o = 5;
+ EXPECT_EQ(5, absl::any_cast<int>(o));
+ }
+
+ {
+ const CopyOnly copy_only(5);
+ absl::any o;
+ o = copy_only;
+ EXPECT_EQ(5, absl::any_cast<CopyOnly&>(o).value);
+ }
+
+ static_assert(!std::is_assignable<MoveOnly, absl::any>::value, "");
+}
+
+// Suppress MSVC warnings.
+// 4521: multiple copy constructors specified
+// We wrote multiple of them to test that the correct overloads are selected.
+#ifdef _MSC_VER
+#pragma warning( push )
+#pragma warning( disable : 4521)
+#endif
+
+// Weird type for testing, only used to make sure we "properly" perfect-forward
+// when being placed into an absl::any (use the l-value constructor if given an
+// l-value rather than use the copy constructor).
+struct WeirdConstructor42 {
+ explicit WeirdConstructor42(int value) : value(value) {}
+
+ // Copy-constructor
+ WeirdConstructor42(const WeirdConstructor42& other) : value(other.value) {}
+
+ // L-value "weird" constructor (used when given an l-value)
+ WeirdConstructor42(
+ WeirdConstructor42& /*other*/) // NOLINT(runtime/references)
+ : value(42) {}
+
+ int value;
+};
+#ifdef _MSC_VER
+#pragma warning( pop )
+#endif
+
+TEST(AnyTest, WeirdConversionConstruction) {
+ {
+ const WeirdConstructor42 source(5);
+ absl::any o = source; // Actual copy
+ EXPECT_EQ(5, absl::any_cast<WeirdConstructor42&>(o).value);
+ }
+
+ {
+ WeirdConstructor42 source(5);
+ absl::any o = source; // Weird "conversion"
+ EXPECT_EQ(42, absl::any_cast<WeirdConstructor42&>(o).value);
+ }
+}
+
+TEST(AnyTest, WeirdConversionAssignment) {
+ {
+ const WeirdConstructor42 source(5);
+ absl::any o;
+ o = source; // Actual copy
+ EXPECT_EQ(5, absl::any_cast<WeirdConstructor42&>(o).value);
+ }
+
+ {
+ WeirdConstructor42 source(5);
+ absl::any o;
+ o = source; // Weird "conversion"
+ EXPECT_EQ(42, absl::any_cast<WeirdConstructor42&>(o).value);
+ }
+}
+
+struct Value {};
+
+TEST(AnyTest, AnyCastValue) {
+ {
+ absl::any o;
+ o.emplace<int>(5);
+ EXPECT_EQ(5, absl::any_cast<int>(o));
+ EXPECT_EQ(5, absl::any_cast<int>(AsConst(o)));
+ static_assert(
+ std::is_same<decltype(absl::any_cast<Value>(o)), Value>::value, "");
+ }
+
+ {
+ absl::any o;
+ o.emplace<int>(5);
+ EXPECT_EQ(5, absl::any_cast<const int>(o));
+ EXPECT_EQ(5, absl::any_cast<const int>(AsConst(o)));
+ static_assert(std::is_same<decltype(absl::any_cast<const Value>(o)),
+ const Value>::value,
+ "");
+ }
+}
+
+TEST(AnyTest, AnyCastReference) {
+ {
+ absl::any o;
+ o.emplace<int>(5);
+ EXPECT_EQ(5, absl::any_cast<int&>(o));
+ EXPECT_EQ(5, absl::any_cast<const int&>(AsConst(o)));
+ static_assert(
+ std::is_same<decltype(absl::any_cast<Value&>(o)), Value&>::value, "");
+ }
+
+ {
+ absl::any o;
+ o.emplace<int>(5);
+ EXPECT_EQ(5, absl::any_cast<const int>(o));
+ EXPECT_EQ(5, absl::any_cast<const int>(AsConst(o)));
+ static_assert(std::is_same<decltype(absl::any_cast<const Value&>(o)),
+ const Value&>::value,
+ "");
+ }
+
+ {
+ absl::any o;
+ o.emplace<int>(5);
+ EXPECT_EQ(5, absl::any_cast<int&&>(std::move(o)));
+ static_assert(std::is_same<decltype(absl::any_cast<Value&&>(std::move(o))),
+ Value&&>::value,
+ "");
+ }
+
+ {
+ absl::any o;
+ o.emplace<int>(5);
+ EXPECT_EQ(5, absl::any_cast<const int>(std::move(o)));
+ static_assert(
+ std::is_same<decltype(absl::any_cast<const Value&&>(std::move(o))),
+ const Value&&>::value,
+ "");
+ }
+}
+
+TEST(AnyTest, AnyCastPointer) {
+ {
+ absl::any o;
+ EXPECT_EQ(nullptr, absl::any_cast<char>(&o));
+ o.emplace<int>(5);
+ EXPECT_EQ(nullptr, absl::any_cast<char>(&o));
+ o.emplace<char>('a');
+ EXPECT_EQ('a', *absl::any_cast<char>(&o));
+ static_assert(
+ std::is_same<decltype(absl::any_cast<Value>(&o)), Value*>::value, "");
+ }
+
+ {
+ absl::any o;
+ EXPECT_EQ(nullptr, absl::any_cast<const char>(&o));
+ o.emplace<int>(5);
+ EXPECT_EQ(nullptr, absl::any_cast<const char>(&o));
+ o.emplace<char>('a');
+ EXPECT_EQ('a', *absl::any_cast<const char>(&o));
+ static_assert(std::is_same<decltype(absl::any_cast<const Value>(&o)),
+ const Value*>::value,
+ "");
+ }
+}
+
+TEST(AnyTest, MakeAny) {
+ const CopyOnly copy_only{};
+ auto o = absl::make_any<IntMoveOnlyCopyOnly>(5, MoveOnly(), copy_only);
+ static_assert(std::is_same<decltype(o), absl::any>::value, "");
+ EXPECT_EQ(5, absl::any_cast<IntMoveOnlyCopyOnly&>(o).value);
+}
+
+TEST(AnyTest, MakeAnyIList) {
+ const CopyOnly copy_only{};
+ auto o =
+ absl::make_any<ListMoveOnlyCopyOnly>({1, 2, 3}, MoveOnly(), copy_only);
+ static_assert(std::is_same<decltype(o), absl::any>::value, "");
+ ListMoveOnlyCopyOnly& v = absl::any_cast<ListMoveOnlyCopyOnly&>(o);
+ std::vector<int> expected_values = {1, 2, 3};
+ EXPECT_EQ(expected_values, v.values);
+}
+
+// Test the use of copy constructor and operator=
+TEST(AnyTest, Copy) {
+ InstanceTracker tracker_raii;
+
+ {
+ absl::any o(absl::in_place_type<CopyableOnlyInstance>, 123);
+ CopyableOnlyInstance* f1 = absl::any_cast<CopyableOnlyInstance>(&o);
+
+ absl::any o2(o);
+ const CopyableOnlyInstance* f2 = absl::any_cast<CopyableOnlyInstance>(&o2);
+ EXPECT_EQ(123, f2->value());
+ EXPECT_NE(f1, f2);
+
+ absl::any o3;
+ o3 = o2;
+ const CopyableOnlyInstance* f3 = absl::any_cast<CopyableOnlyInstance>(&o3);
+ EXPECT_EQ(123, f3->value());
+ EXPECT_NE(f2, f3);
+
+ const absl::any o4(4);
+ // copy construct from const lvalue ref.
+ absl::any o5 = o4;
+ EXPECT_EQ(4, absl::any_cast<int>(o4));
+ EXPECT_EQ(4, absl::any_cast<int>(o5));
+
+ // Copy construct from const rvalue ref.
+ absl::any o6 = std::move(o4); // NOLINT
+ EXPECT_EQ(4, absl::any_cast<int>(o4));
+ EXPECT_EQ(4, absl::any_cast<int>(o6));
+ }
+}
+
+TEST(AnyTest, Move) {
+ InstanceTracker tracker_raii;
+
+ absl::any any1;
+ any1.emplace<CopyableOnlyInstance>(5);
+
+ // This is a copy, so copy count increases to 1.
+ absl::any any2 = any1;
+ EXPECT_EQ(5, absl::any_cast<CopyableOnlyInstance&>(any1).value());
+ EXPECT_EQ(5, absl::any_cast<CopyableOnlyInstance&>(any2).value());
+ EXPECT_EQ(1, tracker_raii.copies());
+
+ // This isn't a copy, so copy count doesn't increase.
+ absl::any any3 = std::move(any2);
+ EXPECT_EQ(5, absl::any_cast<CopyableOnlyInstance&>(any3).value());
+ EXPECT_EQ(1, tracker_raii.copies());
+
+ absl::any any4;
+ any4 = std::move(any3);
+ EXPECT_EQ(5, absl::any_cast<CopyableOnlyInstance&>(any4).value());
+ EXPECT_EQ(1, tracker_raii.copies());
+
+ absl::any tmp4(4);
+ absl::any o4(std::move(tmp4)); // move construct
+ EXPECT_EQ(4, absl::any_cast<int>(o4));
+ o4 = *&o4; // self assign
+ EXPECT_EQ(4, absl::any_cast<int>(o4));
+ EXPECT_TRUE(o4.has_value());
+
+ absl::any o5;
+ absl::any tmp5(5);
+ o5 = std::move(tmp5); // move assign
+ EXPECT_EQ(5, absl::any_cast<int>(o5));
+}
+
+// Reset the ObjectOwner with an object of a different type
+TEST(AnyTest, Reset) {
+ absl::any o;
+ o.emplace<int>();
+
+ o.reset();
+ EXPECT_FALSE(o.has_value());
+
+ o.emplace<char>();
+ EXPECT_TRUE(o.has_value());
+}
+
+TEST(AnyTest, ConversionConstructionCausesOneCopy) {
+ InstanceTracker tracker_raii;
+ CopyableOnlyInstance counter(5);
+ absl::any o(counter);
+ EXPECT_EQ(5, absl::any_cast<CopyableOnlyInstance&>(o).value());
+ EXPECT_EQ(1, tracker_raii.copies());
+}
+
+//////////////////////////////////
+// Tests for Exception Behavior //
+//////////////////////////////////
+
+#if defined(ABSL_USES_STD_ANY)
+
+// If using a std `any` implementation, we can't check for a specific message.
+#define ABSL_ANY_TEST_EXPECT_BAD_ANY_CAST(...) \
+ ABSL_BASE_INTERNAL_EXPECT_FAIL((__VA_ARGS__), absl::bad_any_cast, \
+ "")
+
+#else
+
+// If using the absl `any` implementation, we can rely on a specific message.
+#define ABSL_ANY_TEST_EXPECT_BAD_ANY_CAST(...) \
+ ABSL_BASE_INTERNAL_EXPECT_FAIL((__VA_ARGS__), absl::bad_any_cast, \
+ "Bad any cast")
+
+#endif // defined(ABSL_USES_STD_ANY)
+
+TEST(AnyTest, ThrowBadAlloc) {
+ {
+ absl::any a;
+ ABSL_ANY_TEST_EXPECT_BAD_ANY_CAST(absl::any_cast<int&>(a));
+ ABSL_ANY_TEST_EXPECT_BAD_ANY_CAST(absl::any_cast<const int&>(a));
+ ABSL_ANY_TEST_EXPECT_BAD_ANY_CAST(absl::any_cast<int&&>(absl::any{}));
+ ABSL_ANY_TEST_EXPECT_BAD_ANY_CAST(absl::any_cast<const int&&>(absl::any{}));
+ ABSL_ANY_TEST_EXPECT_BAD_ANY_CAST(absl::any_cast<int>(a));
+ ABSL_ANY_TEST_EXPECT_BAD_ANY_CAST(absl::any_cast<const int>(a));
+ ABSL_ANY_TEST_EXPECT_BAD_ANY_CAST(absl::any_cast<int>(absl::any{}));
+ ABSL_ANY_TEST_EXPECT_BAD_ANY_CAST(absl::any_cast<const int>(absl::any{}));
+
+ // const absl::any operand
+ ABSL_ANY_TEST_EXPECT_BAD_ANY_CAST(absl::any_cast<const int&>(AsConst(a)));
+ ABSL_ANY_TEST_EXPECT_BAD_ANY_CAST(absl::any_cast<int>(AsConst(a)));
+ ABSL_ANY_TEST_EXPECT_BAD_ANY_CAST(absl::any_cast<const int>(AsConst(a)));
+ }
+
+ {
+ absl::any a(absl::in_place_type<int>);
+ ABSL_ANY_TEST_EXPECT_BAD_ANY_CAST(absl::any_cast<float&>(a));
+ ABSL_ANY_TEST_EXPECT_BAD_ANY_CAST(absl::any_cast<const float&>(a));
+ ABSL_ANY_TEST_EXPECT_BAD_ANY_CAST(absl::any_cast<float&&>(absl::any{}));
+ ABSL_ANY_TEST_EXPECT_BAD_ANY_CAST(
+ absl::any_cast<const float&&>(absl::any{}));
+ ABSL_ANY_TEST_EXPECT_BAD_ANY_CAST(absl::any_cast<float>(a));
+ ABSL_ANY_TEST_EXPECT_BAD_ANY_CAST(absl::any_cast<const float>(a));
+ ABSL_ANY_TEST_EXPECT_BAD_ANY_CAST(absl::any_cast<float>(absl::any{}));
+ ABSL_ANY_TEST_EXPECT_BAD_ANY_CAST(absl::any_cast<const float>(absl::any{}));
+
+ // const absl::any operand
+ ABSL_ANY_TEST_EXPECT_BAD_ANY_CAST(absl::any_cast<const float&>(AsConst(a)));
+ ABSL_ANY_TEST_EXPECT_BAD_ANY_CAST(absl::any_cast<float>(AsConst(a)));
+ ABSL_ANY_TEST_EXPECT_BAD_ANY_CAST(absl::any_cast<const float>(AsConst(a)));
+ }
+}
+
+class BadCopy {};
+
+struct BadCopyable {
+ BadCopyable() = default;
+ BadCopyable(BadCopyable&&) = default;
+ BadCopyable(const BadCopyable&) {
+#ifdef ABSL_HAVE_EXCEPTIONS
+ throw BadCopy();
+#else
+ ABSL_RAW_LOG(FATAL, "Bad copy");
+#endif
+ }
+};
+
+#define ABSL_ANY_TEST_EXPECT_BAD_COPY(...) \
+ ABSL_BASE_INTERNAL_EXPECT_FAIL((__VA_ARGS__), BadCopy, "Bad copy")
+
+// Test the guarantees regarding exceptions in copy/assign.
+TEST(AnyTest, FailedCopy) {
+ {
+ const BadCopyable bad{};
+ ABSL_ANY_TEST_EXPECT_BAD_COPY(absl::any{bad});
+ }
+
+ {
+ absl::any src(absl::in_place_type<BadCopyable>);
+ ABSL_ANY_TEST_EXPECT_BAD_COPY(absl::any{src});
+ }
+
+ {
+ BadCopyable bad;
+ absl::any target;
+ ABSL_ANY_TEST_EXPECT_BAD_COPY(target = bad);
+ }
+
+ {
+ BadCopyable bad;
+ absl::any target(absl::in_place_type<BadCopyable>);
+ ABSL_ANY_TEST_EXPECT_BAD_COPY(target = bad);
+ EXPECT_TRUE(target.has_value());
+ }
+
+ {
+ absl::any src(absl::in_place_type<BadCopyable>);
+ absl::any target;
+ ABSL_ANY_TEST_EXPECT_BAD_COPY(target = src);
+ EXPECT_FALSE(target.has_value());
+ }
+
+ {
+ absl::any src(absl::in_place_type<BadCopyable>);
+ absl::any target(absl::in_place_type<BadCopyable>);
+ ABSL_ANY_TEST_EXPECT_BAD_COPY(target = src);
+ EXPECT_TRUE(target.has_value());
+ }
+}
+
+// Test the guarantees regarding exceptions in emplace.
+TEST(AnyTest, FailedEmplace) {
+ {
+ BadCopyable bad;
+ absl::any target;
+ ABSL_ANY_TEST_EXPECT_BAD_COPY(target.emplace<BadCopyable>(bad));
+ }
+
+ {
+ BadCopyable bad;
+ absl::any target(absl::in_place_type<int>);
+ ABSL_ANY_TEST_EXPECT_BAD_COPY(target.emplace<BadCopyable>(bad));
+#if defined(ABSL_USES_STD_ANY) && defined(__GLIBCXX__)
+ // libstdc++ std::any::emplace() implementation (as of 7.2) has a bug: if an
+ // exception is thrown, *this contains a value.
+#define ABSL_GLIBCXX_ANY_EMPLACE_EXCEPTION_BUG 1
+#endif
+#if defined(ABSL_HAVE_EXCEPTIONS) && \
+ !defined(ABSL_GLIBCXX_ANY_EMPLACE_EXCEPTION_BUG)
+ EXPECT_FALSE(target.has_value());
+#endif
+ }
+}
+
+} // namespace
+
+#endif // #if !defined(ABSL_USES_STD_ANY)
diff --git a/third_party/abseil/src/absl/types/bad_any_cast.cc b/third_party/abseil/src/absl/types/bad_any_cast.cc
new file mode 100644
index 0000000..b0592cc
--- /dev/null
+++ b/third_party/abseil/src/absl/types/bad_any_cast.cc
@@ -0,0 +1,46 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/types/bad_any_cast.h"
+
+#ifndef ABSL_USES_STD_ANY
+
+#include <cstdlib>
+
+#include "absl/base/config.h"
+#include "absl/base/internal/raw_logging.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+bad_any_cast::~bad_any_cast() = default;
+
+const char* bad_any_cast::what() const noexcept { return "Bad any cast"; }
+
+namespace any_internal {
+
+void ThrowBadAnyCast() {
+#ifdef ABSL_HAVE_EXCEPTIONS
+ throw bad_any_cast();
+#else
+ ABSL_RAW_LOG(FATAL, "Bad any cast");
+ std::abort();
+#endif
+}
+
+} // namespace any_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_USES_STD_ANY
diff --git a/third_party/abseil/src/absl/types/bad_any_cast.h b/third_party/abseil/src/absl/types/bad_any_cast.h
new file mode 100644
index 0000000..114cef8
--- /dev/null
+++ b/third_party/abseil/src/absl/types/bad_any_cast.h
@@ -0,0 +1,75 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// bad_any_cast.h
+// -----------------------------------------------------------------------------
+//
+// This header file defines the `absl::bad_any_cast` type.
+
+#ifndef ABSL_TYPES_BAD_ANY_CAST_H_
+#define ABSL_TYPES_BAD_ANY_CAST_H_
+
+#include <typeinfo>
+
+#include "absl/base/config.h"
+
+#ifdef ABSL_USES_STD_ANY
+
+#include <any>
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+using std::bad_any_cast;
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#else // ABSL_USES_STD_ANY
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+// -----------------------------------------------------------------------------
+// bad_any_cast
+// -----------------------------------------------------------------------------
+//
+// An `absl::bad_any_cast` type is an exception type that is thrown when
+// failing to successfully cast the return value of an `absl::any` object.
+//
+// Example:
+//
+// auto a = absl::any(65);
+// absl::any_cast<int>(a); // 65
+// try {
+// absl::any_cast<char>(a);
+// } catch(const absl::bad_any_cast& e) {
+// std::cout << "Bad any cast: " << e.what() << '\n';
+// }
+class bad_any_cast : public std::bad_cast {
+ public:
+ ~bad_any_cast() override;
+ const char* what() const noexcept override;
+};
+
+namespace any_internal {
+
+[[noreturn]] void ThrowBadAnyCast();
+
+} // namespace any_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_USES_STD_ANY
+
+#endif // ABSL_TYPES_BAD_ANY_CAST_H_
diff --git a/third_party/abseil/src/absl/types/bad_optional_access.cc b/third_party/abseil/src/absl/types/bad_optional_access.cc
new file mode 100644
index 0000000..26aca70
--- /dev/null
+++ b/third_party/abseil/src/absl/types/bad_optional_access.cc
@@ -0,0 +1,48 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/types/bad_optional_access.h"
+
+#ifndef ABSL_USES_STD_OPTIONAL
+
+#include <cstdlib>
+
+#include "absl/base/config.h"
+#include "absl/base/internal/raw_logging.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+bad_optional_access::~bad_optional_access() = default;
+
+const char* bad_optional_access::what() const noexcept {
+ return "optional has no value";
+}
+
+namespace optional_internal {
+
+void throw_bad_optional_access() {
+#ifdef ABSL_HAVE_EXCEPTIONS
+ throw bad_optional_access();
+#else
+ ABSL_RAW_LOG(FATAL, "Bad optional access");
+ abort();
+#endif
+}
+
+} // namespace optional_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_USES_STD_OPTIONAL
diff --git a/third_party/abseil/src/absl/types/bad_optional_access.h b/third_party/abseil/src/absl/types/bad_optional_access.h
new file mode 100644
index 0000000..a500286
--- /dev/null
+++ b/third_party/abseil/src/absl/types/bad_optional_access.h
@@ -0,0 +1,78 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// bad_optional_access.h
+// -----------------------------------------------------------------------------
+//
+// This header file defines the `absl::bad_optional_access` type.
+
+#ifndef ABSL_TYPES_BAD_OPTIONAL_ACCESS_H_
+#define ABSL_TYPES_BAD_OPTIONAL_ACCESS_H_
+
+#include <stdexcept>
+
+#include "absl/base/config.h"
+
+#ifdef ABSL_USES_STD_OPTIONAL
+
+#include <optional>
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+using std::bad_optional_access;
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#else // ABSL_USES_STD_OPTIONAL
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+// -----------------------------------------------------------------------------
+// bad_optional_access
+// -----------------------------------------------------------------------------
+//
+// An `absl::bad_optional_access` type is an exception type that is thrown when
+// attempting to access an `absl::optional` object that does not contain a
+// value.
+//
+// Example:
+//
+// absl::optional<int> o;
+//
+// try {
+// int n = o.value();
+// } catch(const absl::bad_optional_access& e) {
+// std::cout << "Bad optional access: " << e.what() << '\n';
+// }
+class bad_optional_access : public std::exception {
+ public:
+ bad_optional_access() = default;
+ ~bad_optional_access() override;
+ const char* what() const noexcept override;
+};
+
+namespace optional_internal {
+
+// throw delegator
+[[noreturn]] void throw_bad_optional_access();
+
+} // namespace optional_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_USES_STD_OPTIONAL
+
+#endif // ABSL_TYPES_BAD_OPTIONAL_ACCESS_H_
diff --git a/third_party/abseil/src/absl/types/bad_variant_access.cc b/third_party/abseil/src/absl/types/bad_variant_access.cc
new file mode 100644
index 0000000..3dc88cc
--- /dev/null
+++ b/third_party/abseil/src/absl/types/bad_variant_access.cc
@@ -0,0 +1,64 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/types/bad_variant_access.h"
+
+#ifndef ABSL_USES_STD_VARIANT
+
+#include <cstdlib>
+#include <stdexcept>
+
+#include "absl/base/config.h"
+#include "absl/base/internal/raw_logging.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+//////////////////////////
+// [variant.bad.access] //
+//////////////////////////
+
+bad_variant_access::~bad_variant_access() = default;
+
+const char* bad_variant_access::what() const noexcept {
+ return "Bad variant access";
+}
+
+namespace variant_internal {
+
+void ThrowBadVariantAccess() {
+#ifdef ABSL_HAVE_EXCEPTIONS
+ throw bad_variant_access();
+#else
+ ABSL_RAW_LOG(FATAL, "Bad variant access");
+ abort(); // TODO(calabrese) Remove once RAW_LOG FATAL is noreturn.
+#endif
+}
+
+void Rethrow() {
+#ifdef ABSL_HAVE_EXCEPTIONS
+ throw;
+#else
+ ABSL_RAW_LOG(FATAL,
+ "Internal error in absl::variant implementation. Attempted to "
+ "rethrow an exception when building with exceptions disabled.");
+ abort(); // TODO(calabrese) Remove once RAW_LOG FATAL is noreturn.
+#endif
+}
+
+} // namespace variant_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_USES_STD_VARIANT
diff --git a/third_party/abseil/src/absl/types/bad_variant_access.h b/third_party/abseil/src/absl/types/bad_variant_access.h
new file mode 100644
index 0000000..095969f
--- /dev/null
+++ b/third_party/abseil/src/absl/types/bad_variant_access.h
@@ -0,0 +1,82 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// bad_variant_access.h
+// -----------------------------------------------------------------------------
+//
+// This header file defines the `absl::bad_variant_access` type.
+
+#ifndef ABSL_TYPES_BAD_VARIANT_ACCESS_H_
+#define ABSL_TYPES_BAD_VARIANT_ACCESS_H_
+
+#include <stdexcept>
+
+#include "absl/base/config.h"
+
+#ifdef ABSL_USES_STD_VARIANT
+
+#include <variant>
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+using std::bad_variant_access;
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#else // ABSL_USES_STD_VARIANT
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+// -----------------------------------------------------------------------------
+// bad_variant_access
+// -----------------------------------------------------------------------------
+//
+// An `absl::bad_variant_access` type is an exception type that is thrown in
+// the following cases:
+//
+// * Calling `absl::get(absl::variant) with an index or type that does not
+// match the currently selected alternative type
+// * Calling `absl::visit on an `absl::variant` that is in the
+// `variant::valueless_by_exception` state.
+//
+// Example:
+//
+// absl::variant<int, std::string> v;
+// v = 1;
+// try {
+// absl::get<std::string>(v);
+// } catch(const absl::bad_variant_access& e) {
+// std::cout << "Bad variant access: " << e.what() << '\n';
+// }
+class bad_variant_access : public std::exception {
+ public:
+ bad_variant_access() noexcept = default;
+ ~bad_variant_access() override;
+ const char* what() const noexcept override;
+};
+
+namespace variant_internal {
+
+[[noreturn]] void ThrowBadVariantAccess();
+[[noreturn]] void Rethrow();
+
+} // namespace variant_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_USES_STD_VARIANT
+
+#endif // ABSL_TYPES_BAD_VARIANT_ACCESS_H_
diff --git a/third_party/abseil/src/absl/types/compare.h b/third_party/abseil/src/absl/types/compare.h
new file mode 100644
index 0000000..19b076e
--- /dev/null
+++ b/third_party/abseil/src/absl/types/compare.h
@@ -0,0 +1,600 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// compare.h
+// -----------------------------------------------------------------------------
+//
+// This header file defines the `absl::weak_equality`, `absl::strong_equality`,
+// `absl::partial_ordering`, `absl::weak_ordering`, and `absl::strong_ordering`
+// types for storing the results of three way comparisons.
+//
+// Example:
+// absl::weak_ordering compare(const std::string& a, const std::string& b);
+//
+// These are C++11 compatible versions of the C++20 corresponding types
+// (`std::weak_equality`, etc.) and are designed to be drop-in replacements
+// for code compliant with C++20.
+
+#ifndef ABSL_TYPES_COMPARE_H_
+#define ABSL_TYPES_COMPARE_H_
+
+#include <cstddef>
+#include <cstdint>
+#include <cstdlib>
+#include <type_traits>
+
+#include "absl/base/attributes.h"
+#include "absl/meta/type_traits.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace compare_internal {
+
+using value_type = int8_t;
+
+template <typename T>
+struct Fail {
+ static_assert(sizeof(T) < 0, "Only literal `0` is allowed.");
+};
+
+// We need the NullPtrT template to avoid triggering the modernize-use-nullptr
+// ClangTidy warning in user code.
+template <typename NullPtrT = std::nullptr_t>
+struct OnlyLiteralZero {
+ constexpr OnlyLiteralZero(NullPtrT) noexcept {} // NOLINT
+
+ // Fails compilation when `nullptr` or integral type arguments other than
+ // `int` are passed. This constructor doesn't accept `int` because literal `0`
+ // has type `int`. Literal `0` arguments will be implicitly converted to
+ // `std::nullptr_t` and accepted by the above constructor, while other `int`
+ // arguments will fail to be converted and cause compilation failure.
+ template <
+ typename T,
+ typename = typename std::enable_if<
+ std::is_same<T, std::nullptr_t>::value ||
+ (std::is_integral<T>::value && !std::is_same<T, int>::value)>::type,
+ typename = typename Fail<T>::type>
+ OnlyLiteralZero(T); // NOLINT
+};
+
+enum class eq : value_type {
+ equal = 0,
+ equivalent = equal,
+ nonequal = 1,
+ nonequivalent = nonequal,
+};
+
+enum class ord : value_type { less = -1, greater = 1 };
+
+enum class ncmp : value_type { unordered = -127 };
+
+// Define macros to allow for creation or emulation of C++17 inline variables
+// based on whether the feature is supported. Note: we can't use
+// ABSL_INTERNAL_INLINE_CONSTEXPR here because the variables here are of
+// incomplete types so they need to be defined after the types are complete.
+#ifdef __cpp_inline_variables
+
+// A no-op expansion that can be followed by a semicolon at class level.
+#define ABSL_COMPARE_INLINE_BASECLASS_DECL(name) static_assert(true, "")
+
+#define ABSL_COMPARE_INLINE_SUBCLASS_DECL(type, name) \
+ static const type name
+
+#define ABSL_COMPARE_INLINE_INIT(type, name, init) \
+ inline constexpr type type::name(init)
+
+#else // __cpp_inline_variables
+
+#define ABSL_COMPARE_INLINE_BASECLASS_DECL(name) \
+ ABSL_CONST_INIT static const T name
+
+// A no-op expansion that can be followed by a semicolon at class level.
+#define ABSL_COMPARE_INLINE_SUBCLASS_DECL(type, name) static_assert(true, "")
+
+#define ABSL_COMPARE_INLINE_INIT(type, name, init) \
+ template <typename T> \
+ const T compare_internal::type##_base<T>::name(init)
+
+#endif // __cpp_inline_variables
+
+// These template base classes allow for defining the values of the constants
+// in the header file (for performance) without using inline variables (which
+// aren't available in C++11).
+template <typename T>
+struct weak_equality_base {
+ ABSL_COMPARE_INLINE_BASECLASS_DECL(equivalent);
+ ABSL_COMPARE_INLINE_BASECLASS_DECL(nonequivalent);
+};
+
+template <typename T>
+struct strong_equality_base {
+ ABSL_COMPARE_INLINE_BASECLASS_DECL(equal);
+ ABSL_COMPARE_INLINE_BASECLASS_DECL(nonequal);
+ ABSL_COMPARE_INLINE_BASECLASS_DECL(equivalent);
+ ABSL_COMPARE_INLINE_BASECLASS_DECL(nonequivalent);
+};
+
+template <typename T>
+struct partial_ordering_base {
+ ABSL_COMPARE_INLINE_BASECLASS_DECL(less);
+ ABSL_COMPARE_INLINE_BASECLASS_DECL(equivalent);
+ ABSL_COMPARE_INLINE_BASECLASS_DECL(greater);
+ ABSL_COMPARE_INLINE_BASECLASS_DECL(unordered);
+};
+
+template <typename T>
+struct weak_ordering_base {
+ ABSL_COMPARE_INLINE_BASECLASS_DECL(less);
+ ABSL_COMPARE_INLINE_BASECLASS_DECL(equivalent);
+ ABSL_COMPARE_INLINE_BASECLASS_DECL(greater);
+};
+
+template <typename T>
+struct strong_ordering_base {
+ ABSL_COMPARE_INLINE_BASECLASS_DECL(less);
+ ABSL_COMPARE_INLINE_BASECLASS_DECL(equal);
+ ABSL_COMPARE_INLINE_BASECLASS_DECL(equivalent);
+ ABSL_COMPARE_INLINE_BASECLASS_DECL(greater);
+};
+
+} // namespace compare_internal
+
+class weak_equality
+ : public compare_internal::weak_equality_base<weak_equality> {
+ explicit constexpr weak_equality(compare_internal::eq v) noexcept
+ : value_(static_cast<compare_internal::value_type>(v)) {}
+ friend struct compare_internal::weak_equality_base<weak_equality>;
+
+ public:
+ ABSL_COMPARE_INLINE_SUBCLASS_DECL(weak_equality, equivalent);
+ ABSL_COMPARE_INLINE_SUBCLASS_DECL(weak_equality, nonequivalent);
+
+ // Comparisons
+ friend constexpr bool operator==(
+ weak_equality v, compare_internal::OnlyLiteralZero<>) noexcept {
+ return v.value_ == 0;
+ }
+ friend constexpr bool operator!=(
+ weak_equality v, compare_internal::OnlyLiteralZero<>) noexcept {
+ return v.value_ != 0;
+ }
+ friend constexpr bool operator==(compare_internal::OnlyLiteralZero<>,
+ weak_equality v) noexcept {
+ return 0 == v.value_;
+ }
+ friend constexpr bool operator!=(compare_internal::OnlyLiteralZero<>,
+ weak_equality v) noexcept {
+ return 0 != v.value_;
+ }
+ friend constexpr bool operator==(weak_equality v1,
+ weak_equality v2) noexcept {
+ return v1.value_ == v2.value_;
+ }
+ friend constexpr bool operator!=(weak_equality v1,
+ weak_equality v2) noexcept {
+ return v1.value_ != v2.value_;
+ }
+
+ private:
+ compare_internal::value_type value_;
+};
+ABSL_COMPARE_INLINE_INIT(weak_equality, equivalent,
+ compare_internal::eq::equivalent);
+ABSL_COMPARE_INLINE_INIT(weak_equality, nonequivalent,
+ compare_internal::eq::nonequivalent);
+
+class strong_equality
+ : public compare_internal::strong_equality_base<strong_equality> {
+ explicit constexpr strong_equality(compare_internal::eq v) noexcept
+ : value_(static_cast<compare_internal::value_type>(v)) {}
+ friend struct compare_internal::strong_equality_base<strong_equality>;
+
+ public:
+ ABSL_COMPARE_INLINE_SUBCLASS_DECL(strong_equality, equal);
+ ABSL_COMPARE_INLINE_SUBCLASS_DECL(strong_equality, nonequal);
+ ABSL_COMPARE_INLINE_SUBCLASS_DECL(strong_equality, equivalent);
+ ABSL_COMPARE_INLINE_SUBCLASS_DECL(strong_equality, nonequivalent);
+
+ // Conversion
+ constexpr operator weak_equality() const noexcept { // NOLINT
+ return value_ == 0 ? weak_equality::equivalent
+ : weak_equality::nonequivalent;
+ }
+ // Comparisons
+ friend constexpr bool operator==(
+ strong_equality v, compare_internal::OnlyLiteralZero<>) noexcept {
+ return v.value_ == 0;
+ }
+ friend constexpr bool operator!=(
+ strong_equality v, compare_internal::OnlyLiteralZero<>) noexcept {
+ return v.value_ != 0;
+ }
+ friend constexpr bool operator==(compare_internal::OnlyLiteralZero<>,
+ strong_equality v) noexcept {
+ return 0 == v.value_;
+ }
+ friend constexpr bool operator!=(compare_internal::OnlyLiteralZero<>,
+ strong_equality v) noexcept {
+ return 0 != v.value_;
+ }
+ friend constexpr bool operator==(strong_equality v1,
+ strong_equality v2) noexcept {
+ return v1.value_ == v2.value_;
+ }
+ friend constexpr bool operator!=(strong_equality v1,
+ strong_equality v2) noexcept {
+ return v1.value_ != v2.value_;
+ }
+
+ private:
+ compare_internal::value_type value_;
+};
+ABSL_COMPARE_INLINE_INIT(strong_equality, equal, compare_internal::eq::equal);
+ABSL_COMPARE_INLINE_INIT(strong_equality, nonequal,
+ compare_internal::eq::nonequal);
+ABSL_COMPARE_INLINE_INIT(strong_equality, equivalent,
+ compare_internal::eq::equivalent);
+ABSL_COMPARE_INLINE_INIT(strong_equality, nonequivalent,
+ compare_internal::eq::nonequivalent);
+
+class partial_ordering
+ : public compare_internal::partial_ordering_base<partial_ordering> {
+ explicit constexpr partial_ordering(compare_internal::eq v) noexcept
+ : value_(static_cast<compare_internal::value_type>(v)) {}
+ explicit constexpr partial_ordering(compare_internal::ord v) noexcept
+ : value_(static_cast<compare_internal::value_type>(v)) {}
+ explicit constexpr partial_ordering(compare_internal::ncmp v) noexcept
+ : value_(static_cast<compare_internal::value_type>(v)) {}
+ friend struct compare_internal::partial_ordering_base<partial_ordering>;
+
+ constexpr bool is_ordered() const noexcept {
+ return value_ !=
+ compare_internal::value_type(compare_internal::ncmp::unordered);
+ }
+
+ public:
+ ABSL_COMPARE_INLINE_SUBCLASS_DECL(partial_ordering, less);
+ ABSL_COMPARE_INLINE_SUBCLASS_DECL(partial_ordering, equivalent);
+ ABSL_COMPARE_INLINE_SUBCLASS_DECL(partial_ordering, greater);
+ ABSL_COMPARE_INLINE_SUBCLASS_DECL(partial_ordering, unordered);
+
+ // Conversion
+ constexpr operator weak_equality() const noexcept { // NOLINT
+ return value_ == 0 ? weak_equality::equivalent
+ : weak_equality::nonequivalent;
+ }
+ // Comparisons
+ friend constexpr bool operator==(
+ partial_ordering v, compare_internal::OnlyLiteralZero<>) noexcept {
+ return v.is_ordered() && v.value_ == 0;
+ }
+ friend constexpr bool operator!=(
+ partial_ordering v, compare_internal::OnlyLiteralZero<>) noexcept {
+ return !v.is_ordered() || v.value_ != 0;
+ }
+ friend constexpr bool operator<(
+ partial_ordering v, compare_internal::OnlyLiteralZero<>) noexcept {
+ return v.is_ordered() && v.value_ < 0;
+ }
+ friend constexpr bool operator<=(
+ partial_ordering v, compare_internal::OnlyLiteralZero<>) noexcept {
+ return v.is_ordered() && v.value_ <= 0;
+ }
+ friend constexpr bool operator>(
+ partial_ordering v, compare_internal::OnlyLiteralZero<>) noexcept {
+ return v.is_ordered() && v.value_ > 0;
+ }
+ friend constexpr bool operator>=(
+ partial_ordering v, compare_internal::OnlyLiteralZero<>) noexcept {
+ return v.is_ordered() && v.value_ >= 0;
+ }
+ friend constexpr bool operator==(compare_internal::OnlyLiteralZero<>,
+ partial_ordering v) noexcept {
+ return v.is_ordered() && 0 == v.value_;
+ }
+ friend constexpr bool operator!=(compare_internal::OnlyLiteralZero<>,
+ partial_ordering v) noexcept {
+ return !v.is_ordered() || 0 != v.value_;
+ }
+ friend constexpr bool operator<(compare_internal::OnlyLiteralZero<>,
+ partial_ordering v) noexcept {
+ return v.is_ordered() && 0 < v.value_;
+ }
+ friend constexpr bool operator<=(compare_internal::OnlyLiteralZero<>,
+ partial_ordering v) noexcept {
+ return v.is_ordered() && 0 <= v.value_;
+ }
+ friend constexpr bool operator>(compare_internal::OnlyLiteralZero<>,
+ partial_ordering v) noexcept {
+ return v.is_ordered() && 0 > v.value_;
+ }
+ friend constexpr bool operator>=(compare_internal::OnlyLiteralZero<>,
+ partial_ordering v) noexcept {
+ return v.is_ordered() && 0 >= v.value_;
+ }
+ friend constexpr bool operator==(partial_ordering v1,
+ partial_ordering v2) noexcept {
+ return v1.value_ == v2.value_;
+ }
+ friend constexpr bool operator!=(partial_ordering v1,
+ partial_ordering v2) noexcept {
+ return v1.value_ != v2.value_;
+ }
+
+ private:
+ compare_internal::value_type value_;
+};
+ABSL_COMPARE_INLINE_INIT(partial_ordering, less, compare_internal::ord::less);
+ABSL_COMPARE_INLINE_INIT(partial_ordering, equivalent,
+ compare_internal::eq::equivalent);
+ABSL_COMPARE_INLINE_INIT(partial_ordering, greater,
+ compare_internal::ord::greater);
+ABSL_COMPARE_INLINE_INIT(partial_ordering, unordered,
+ compare_internal::ncmp::unordered);
+
+class weak_ordering
+ : public compare_internal::weak_ordering_base<weak_ordering> {
+ explicit constexpr weak_ordering(compare_internal::eq v) noexcept
+ : value_(static_cast<compare_internal::value_type>(v)) {}
+ explicit constexpr weak_ordering(compare_internal::ord v) noexcept
+ : value_(static_cast<compare_internal::value_type>(v)) {}
+ friend struct compare_internal::weak_ordering_base<weak_ordering>;
+
+ public:
+ ABSL_COMPARE_INLINE_SUBCLASS_DECL(weak_ordering, less);
+ ABSL_COMPARE_INLINE_SUBCLASS_DECL(weak_ordering, equivalent);
+ ABSL_COMPARE_INLINE_SUBCLASS_DECL(weak_ordering, greater);
+
+ // Conversions
+ constexpr operator weak_equality() const noexcept { // NOLINT
+ return value_ == 0 ? weak_equality::equivalent
+ : weak_equality::nonequivalent;
+ }
+ constexpr operator partial_ordering() const noexcept { // NOLINT
+ return value_ == 0 ? partial_ordering::equivalent
+ : (value_ < 0 ? partial_ordering::less
+ : partial_ordering::greater);
+ }
+ // Comparisons
+ friend constexpr bool operator==(
+ weak_ordering v, compare_internal::OnlyLiteralZero<>) noexcept {
+ return v.value_ == 0;
+ }
+ friend constexpr bool operator!=(
+ weak_ordering v, compare_internal::OnlyLiteralZero<>) noexcept {
+ return v.value_ != 0;
+ }
+ friend constexpr bool operator<(
+ weak_ordering v, compare_internal::OnlyLiteralZero<>) noexcept {
+ return v.value_ < 0;
+ }
+ friend constexpr bool operator<=(
+ weak_ordering v, compare_internal::OnlyLiteralZero<>) noexcept {
+ return v.value_ <= 0;
+ }
+ friend constexpr bool operator>(
+ weak_ordering v, compare_internal::OnlyLiteralZero<>) noexcept {
+ return v.value_ > 0;
+ }
+ friend constexpr bool operator>=(
+ weak_ordering v, compare_internal::OnlyLiteralZero<>) noexcept {
+ return v.value_ >= 0;
+ }
+ friend constexpr bool operator==(compare_internal::OnlyLiteralZero<>,
+ weak_ordering v) noexcept {
+ return 0 == v.value_;
+ }
+ friend constexpr bool operator!=(compare_internal::OnlyLiteralZero<>,
+ weak_ordering v) noexcept {
+ return 0 != v.value_;
+ }
+ friend constexpr bool operator<(compare_internal::OnlyLiteralZero<>,
+ weak_ordering v) noexcept {
+ return 0 < v.value_;
+ }
+ friend constexpr bool operator<=(compare_internal::OnlyLiteralZero<>,
+ weak_ordering v) noexcept {
+ return 0 <= v.value_;
+ }
+ friend constexpr bool operator>(compare_internal::OnlyLiteralZero<>,
+ weak_ordering v) noexcept {
+ return 0 > v.value_;
+ }
+ friend constexpr bool operator>=(compare_internal::OnlyLiteralZero<>,
+ weak_ordering v) noexcept {
+ return 0 >= v.value_;
+ }
+ friend constexpr bool operator==(weak_ordering v1,
+ weak_ordering v2) noexcept {
+ return v1.value_ == v2.value_;
+ }
+ friend constexpr bool operator!=(weak_ordering v1,
+ weak_ordering v2) noexcept {
+ return v1.value_ != v2.value_;
+ }
+
+ private:
+ compare_internal::value_type value_;
+};
+ABSL_COMPARE_INLINE_INIT(weak_ordering, less, compare_internal::ord::less);
+ABSL_COMPARE_INLINE_INIT(weak_ordering, equivalent,
+ compare_internal::eq::equivalent);
+ABSL_COMPARE_INLINE_INIT(weak_ordering, greater,
+ compare_internal::ord::greater);
+
+class strong_ordering
+ : public compare_internal::strong_ordering_base<strong_ordering> {
+ explicit constexpr strong_ordering(compare_internal::eq v) noexcept
+ : value_(static_cast<compare_internal::value_type>(v)) {}
+ explicit constexpr strong_ordering(compare_internal::ord v) noexcept
+ : value_(static_cast<compare_internal::value_type>(v)) {}
+ friend struct compare_internal::strong_ordering_base<strong_ordering>;
+
+ public:
+ ABSL_COMPARE_INLINE_SUBCLASS_DECL(strong_ordering, less);
+ ABSL_COMPARE_INLINE_SUBCLASS_DECL(strong_ordering, equal);
+ ABSL_COMPARE_INLINE_SUBCLASS_DECL(strong_ordering, equivalent);
+ ABSL_COMPARE_INLINE_SUBCLASS_DECL(strong_ordering, greater);
+
+ // Conversions
+ constexpr operator weak_equality() const noexcept { // NOLINT
+ return value_ == 0 ? weak_equality::equivalent
+ : weak_equality::nonequivalent;
+ }
+ constexpr operator strong_equality() const noexcept { // NOLINT
+ return value_ == 0 ? strong_equality::equal : strong_equality::nonequal;
+ }
+ constexpr operator partial_ordering() const noexcept { // NOLINT
+ return value_ == 0 ? partial_ordering::equivalent
+ : (value_ < 0 ? partial_ordering::less
+ : partial_ordering::greater);
+ }
+ constexpr operator weak_ordering() const noexcept { // NOLINT
+ return value_ == 0
+ ? weak_ordering::equivalent
+ : (value_ < 0 ? weak_ordering::less : weak_ordering::greater);
+ }
+ // Comparisons
+ friend constexpr bool operator==(
+ strong_ordering v, compare_internal::OnlyLiteralZero<>) noexcept {
+ return v.value_ == 0;
+ }
+ friend constexpr bool operator!=(
+ strong_ordering v, compare_internal::OnlyLiteralZero<>) noexcept {
+ return v.value_ != 0;
+ }
+ friend constexpr bool operator<(
+ strong_ordering v, compare_internal::OnlyLiteralZero<>) noexcept {
+ return v.value_ < 0;
+ }
+ friend constexpr bool operator<=(
+ strong_ordering v, compare_internal::OnlyLiteralZero<>) noexcept {
+ return v.value_ <= 0;
+ }
+ friend constexpr bool operator>(
+ strong_ordering v, compare_internal::OnlyLiteralZero<>) noexcept {
+ return v.value_ > 0;
+ }
+ friend constexpr bool operator>=(
+ strong_ordering v, compare_internal::OnlyLiteralZero<>) noexcept {
+ return v.value_ >= 0;
+ }
+ friend constexpr bool operator==(compare_internal::OnlyLiteralZero<>,
+ strong_ordering v) noexcept {
+ return 0 == v.value_;
+ }
+ friend constexpr bool operator!=(compare_internal::OnlyLiteralZero<>,
+ strong_ordering v) noexcept {
+ return 0 != v.value_;
+ }
+ friend constexpr bool operator<(compare_internal::OnlyLiteralZero<>,
+ strong_ordering v) noexcept {
+ return 0 < v.value_;
+ }
+ friend constexpr bool operator<=(compare_internal::OnlyLiteralZero<>,
+ strong_ordering v) noexcept {
+ return 0 <= v.value_;
+ }
+ friend constexpr bool operator>(compare_internal::OnlyLiteralZero<>,
+ strong_ordering v) noexcept {
+ return 0 > v.value_;
+ }
+ friend constexpr bool operator>=(compare_internal::OnlyLiteralZero<>,
+ strong_ordering v) noexcept {
+ return 0 >= v.value_;
+ }
+ friend constexpr bool operator==(strong_ordering v1,
+ strong_ordering v2) noexcept {
+ return v1.value_ == v2.value_;
+ }
+ friend constexpr bool operator!=(strong_ordering v1,
+ strong_ordering v2) noexcept {
+ return v1.value_ != v2.value_;
+ }
+
+ private:
+ compare_internal::value_type value_;
+};
+ABSL_COMPARE_INLINE_INIT(strong_ordering, less, compare_internal::ord::less);
+ABSL_COMPARE_INLINE_INIT(strong_ordering, equal, compare_internal::eq::equal);
+ABSL_COMPARE_INLINE_INIT(strong_ordering, equivalent,
+ compare_internal::eq::equivalent);
+ABSL_COMPARE_INLINE_INIT(strong_ordering, greater,
+ compare_internal::ord::greater);
+
+#undef ABSL_COMPARE_INLINE_BASECLASS_DECL
+#undef ABSL_COMPARE_INLINE_SUBCLASS_DECL
+#undef ABSL_COMPARE_INLINE_INIT
+
+namespace compare_internal {
+// We also provide these comparator adapter functions for internal absl use.
+
+// Helper functions to do a boolean comparison of two keys given a boolean
+// or three-way comparator.
+// SFINAE prevents implicit conversions to bool (such as from int).
+template <typename Bool,
+ absl::enable_if_t<std::is_same<bool, Bool>::value, int> = 0>
+constexpr bool compare_result_as_less_than(const Bool r) { return r; }
+constexpr bool compare_result_as_less_than(const absl::weak_ordering r) {
+ return r < 0;
+}
+
+template <typename Compare, typename K, typename LK>
+constexpr bool do_less_than_comparison(const Compare &compare, const K &x,
+ const LK &y) {
+ return compare_result_as_less_than(compare(x, y));
+}
+
+// Helper functions to do a three-way comparison of two keys given a boolean or
+// three-way comparator.
+// SFINAE prevents implicit conversions to int (such as from bool).
+template <typename Int,
+ absl::enable_if_t<std::is_same<int, Int>::value, int> = 0>
+constexpr absl::weak_ordering compare_result_as_ordering(const Int c) {
+ return c < 0 ? absl::weak_ordering::less
+ : c == 0 ? absl::weak_ordering::equivalent
+ : absl::weak_ordering::greater;
+}
+constexpr absl::weak_ordering compare_result_as_ordering(
+ const absl::weak_ordering c) {
+ return c;
+}
+
+template <
+ typename Compare, typename K, typename LK,
+ absl::enable_if_t<!std::is_same<bool, absl::result_of_t<Compare(
+ const K &, const LK &)>>::value,
+ int> = 0>
+constexpr absl::weak_ordering do_three_way_comparison(const Compare &compare,
+ const K &x, const LK &y) {
+ return compare_result_as_ordering(compare(x, y));
+}
+template <
+ typename Compare, typename K, typename LK,
+ absl::enable_if_t<std::is_same<bool, absl::result_of_t<Compare(
+ const K &, const LK &)>>::value,
+ int> = 0>
+constexpr absl::weak_ordering do_three_way_comparison(const Compare &compare,
+ const K &x, const LK &y) {
+ return compare(x, y) ? absl::weak_ordering::less
+ : compare(y, x) ? absl::weak_ordering::greater
+ : absl::weak_ordering::equivalent;
+}
+
+} // namespace compare_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_TYPES_COMPARE_H_
diff --git a/third_party/abseil/src/absl/types/compare_test.cc b/third_party/abseil/src/absl/types/compare_test.cc
new file mode 100644
index 0000000..8095baf
--- /dev/null
+++ b/third_party/abseil/src/absl/types/compare_test.cc
@@ -0,0 +1,389 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/types/compare.h"
+
+#include "gtest/gtest.h"
+#include "absl/base/casts.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace {
+
+// This is necessary to avoid a bunch of lint warnings suggesting that we use
+// EXPECT_EQ/etc., which doesn't work in this case because they convert the `0`
+// to an int, which can't be converted to the unspecified zero type.
+bool Identity(bool b) { return b; }
+
+TEST(Compare, WeakEquality) {
+ EXPECT_TRUE(Identity(weak_equality::equivalent == 0));
+ EXPECT_TRUE(Identity(0 == weak_equality::equivalent));
+ EXPECT_TRUE(Identity(weak_equality::nonequivalent != 0));
+ EXPECT_TRUE(Identity(0 != weak_equality::nonequivalent));
+ const weak_equality values[] = {weak_equality::equivalent,
+ weak_equality::nonequivalent};
+ for (const auto& lhs : values) {
+ for (const auto& rhs : values) {
+ const bool are_equal = &lhs == &rhs;
+ EXPECT_EQ(lhs == rhs, are_equal);
+ EXPECT_EQ(lhs != rhs, !are_equal);
+ }
+ }
+}
+
+TEST(Compare, StrongEquality) {
+ EXPECT_TRUE(Identity(strong_equality::equal == 0));
+ EXPECT_TRUE(Identity(0 == strong_equality::equal));
+ EXPECT_TRUE(Identity(strong_equality::nonequal != 0));
+ EXPECT_TRUE(Identity(0 != strong_equality::nonequal));
+ EXPECT_TRUE(Identity(strong_equality::equivalent == 0));
+ EXPECT_TRUE(Identity(0 == strong_equality::equivalent));
+ EXPECT_TRUE(Identity(strong_equality::nonequivalent != 0));
+ EXPECT_TRUE(Identity(0 != strong_equality::nonequivalent));
+ const strong_equality values[] = {strong_equality::equal,
+ strong_equality::nonequal};
+ for (const auto& lhs : values) {
+ for (const auto& rhs : values) {
+ const bool are_equal = &lhs == &rhs;
+ EXPECT_EQ(lhs == rhs, are_equal);
+ EXPECT_EQ(lhs != rhs, !are_equal);
+ }
+ }
+ EXPECT_TRUE(Identity(strong_equality::equivalent == strong_equality::equal));
+ EXPECT_TRUE(
+ Identity(strong_equality::nonequivalent == strong_equality::nonequal));
+}
+
+TEST(Compare, PartialOrdering) {
+ EXPECT_TRUE(Identity(partial_ordering::less < 0));
+ EXPECT_TRUE(Identity(0 > partial_ordering::less));
+ EXPECT_TRUE(Identity(partial_ordering::less <= 0));
+ EXPECT_TRUE(Identity(0 >= partial_ordering::less));
+ EXPECT_TRUE(Identity(partial_ordering::equivalent == 0));
+ EXPECT_TRUE(Identity(0 == partial_ordering::equivalent));
+ EXPECT_TRUE(Identity(partial_ordering::greater > 0));
+ EXPECT_TRUE(Identity(0 < partial_ordering::greater));
+ EXPECT_TRUE(Identity(partial_ordering::greater >= 0));
+ EXPECT_TRUE(Identity(0 <= partial_ordering::greater));
+ EXPECT_TRUE(Identity(partial_ordering::unordered != 0));
+ EXPECT_TRUE(Identity(0 != partial_ordering::unordered));
+ EXPECT_FALSE(Identity(partial_ordering::unordered < 0));
+ EXPECT_FALSE(Identity(0 < partial_ordering::unordered));
+ EXPECT_FALSE(Identity(partial_ordering::unordered <= 0));
+ EXPECT_FALSE(Identity(0 <= partial_ordering::unordered));
+ EXPECT_FALSE(Identity(partial_ordering::unordered > 0));
+ EXPECT_FALSE(Identity(0 > partial_ordering::unordered));
+ EXPECT_FALSE(Identity(partial_ordering::unordered >= 0));
+ EXPECT_FALSE(Identity(0 >= partial_ordering::unordered));
+ const partial_ordering values[] = {
+ partial_ordering::less, partial_ordering::equivalent,
+ partial_ordering::greater, partial_ordering::unordered};
+ for (const auto& lhs : values) {
+ for (const auto& rhs : values) {
+ const bool are_equal = &lhs == &rhs;
+ EXPECT_EQ(lhs == rhs, are_equal);
+ EXPECT_EQ(lhs != rhs, !are_equal);
+ }
+ }
+}
+
+TEST(Compare, WeakOrdering) {
+ EXPECT_TRUE(Identity(weak_ordering::less < 0));
+ EXPECT_TRUE(Identity(0 > weak_ordering::less));
+ EXPECT_TRUE(Identity(weak_ordering::less <= 0));
+ EXPECT_TRUE(Identity(0 >= weak_ordering::less));
+ EXPECT_TRUE(Identity(weak_ordering::equivalent == 0));
+ EXPECT_TRUE(Identity(0 == weak_ordering::equivalent));
+ EXPECT_TRUE(Identity(weak_ordering::greater > 0));
+ EXPECT_TRUE(Identity(0 < weak_ordering::greater));
+ EXPECT_TRUE(Identity(weak_ordering::greater >= 0));
+ EXPECT_TRUE(Identity(0 <= weak_ordering::greater));
+ const weak_ordering values[] = {
+ weak_ordering::less, weak_ordering::equivalent, weak_ordering::greater};
+ for (const auto& lhs : values) {
+ for (const auto& rhs : values) {
+ const bool are_equal = &lhs == &rhs;
+ EXPECT_EQ(lhs == rhs, are_equal);
+ EXPECT_EQ(lhs != rhs, !are_equal);
+ }
+ }
+}
+
+TEST(Compare, StrongOrdering) {
+ EXPECT_TRUE(Identity(strong_ordering::less < 0));
+ EXPECT_TRUE(Identity(0 > strong_ordering::less));
+ EXPECT_TRUE(Identity(strong_ordering::less <= 0));
+ EXPECT_TRUE(Identity(0 >= strong_ordering::less));
+ EXPECT_TRUE(Identity(strong_ordering::equal == 0));
+ EXPECT_TRUE(Identity(0 == strong_ordering::equal));
+ EXPECT_TRUE(Identity(strong_ordering::equivalent == 0));
+ EXPECT_TRUE(Identity(0 == strong_ordering::equivalent));
+ EXPECT_TRUE(Identity(strong_ordering::greater > 0));
+ EXPECT_TRUE(Identity(0 < strong_ordering::greater));
+ EXPECT_TRUE(Identity(strong_ordering::greater >= 0));
+ EXPECT_TRUE(Identity(0 <= strong_ordering::greater));
+ const strong_ordering values[] = {
+ strong_ordering::less, strong_ordering::equal, strong_ordering::greater};
+ for (const auto& lhs : values) {
+ for (const auto& rhs : values) {
+ const bool are_equal = &lhs == &rhs;
+ EXPECT_EQ(lhs == rhs, are_equal);
+ EXPECT_EQ(lhs != rhs, !are_equal);
+ }
+ }
+ EXPECT_TRUE(Identity(strong_ordering::equivalent == strong_ordering::equal));
+}
+
+TEST(Compare, Conversions) {
+ EXPECT_TRUE(
+ Identity(implicit_cast<weak_equality>(strong_equality::equal) == 0));
+ EXPECT_TRUE(
+ Identity(implicit_cast<weak_equality>(strong_equality::nonequal) != 0));
+ EXPECT_TRUE(
+ Identity(implicit_cast<weak_equality>(strong_equality::equivalent) == 0));
+ EXPECT_TRUE(Identity(
+ implicit_cast<weak_equality>(strong_equality::nonequivalent) != 0));
+
+ EXPECT_TRUE(
+ Identity(implicit_cast<weak_equality>(partial_ordering::less) != 0));
+ EXPECT_TRUE(Identity(
+ implicit_cast<weak_equality>(partial_ordering::equivalent) == 0));
+ EXPECT_TRUE(
+ Identity(implicit_cast<weak_equality>(partial_ordering::greater) != 0));
+ EXPECT_TRUE(
+ Identity(implicit_cast<weak_equality>(partial_ordering::unordered) != 0));
+
+ EXPECT_TRUE(implicit_cast<weak_equality>(weak_ordering::less) != 0);
+ EXPECT_TRUE(
+ Identity(implicit_cast<weak_equality>(weak_ordering::equivalent) == 0));
+ EXPECT_TRUE(
+ Identity(implicit_cast<weak_equality>(weak_ordering::greater) != 0));
+
+ EXPECT_TRUE(
+ Identity(implicit_cast<partial_ordering>(weak_ordering::less) != 0));
+ EXPECT_TRUE(
+ Identity(implicit_cast<partial_ordering>(weak_ordering::less) < 0));
+ EXPECT_TRUE(
+ Identity(implicit_cast<partial_ordering>(weak_ordering::less) <= 0));
+ EXPECT_TRUE(Identity(
+ implicit_cast<partial_ordering>(weak_ordering::equivalent) == 0));
+ EXPECT_TRUE(
+ Identity(implicit_cast<partial_ordering>(weak_ordering::greater) != 0));
+ EXPECT_TRUE(
+ Identity(implicit_cast<partial_ordering>(weak_ordering::greater) > 0));
+ EXPECT_TRUE(
+ Identity(implicit_cast<partial_ordering>(weak_ordering::greater) >= 0));
+
+ EXPECT_TRUE(
+ Identity(implicit_cast<weak_equality>(strong_ordering::less) != 0));
+ EXPECT_TRUE(
+ Identity(implicit_cast<weak_equality>(strong_ordering::equal) == 0));
+ EXPECT_TRUE(
+ Identity(implicit_cast<weak_equality>(strong_ordering::equivalent) == 0));
+ EXPECT_TRUE(
+ Identity(implicit_cast<weak_equality>(strong_ordering::greater) != 0));
+
+ EXPECT_TRUE(
+ Identity(implicit_cast<strong_equality>(strong_ordering::less) != 0));
+ EXPECT_TRUE(
+ Identity(implicit_cast<strong_equality>(strong_ordering::equal) == 0));
+ EXPECT_TRUE(Identity(
+ implicit_cast<strong_equality>(strong_ordering::equivalent) == 0));
+ EXPECT_TRUE(
+ Identity(implicit_cast<strong_equality>(strong_ordering::greater) != 0));
+
+ EXPECT_TRUE(
+ Identity(implicit_cast<partial_ordering>(strong_ordering::less) != 0));
+ EXPECT_TRUE(
+ Identity(implicit_cast<partial_ordering>(strong_ordering::less) < 0));
+ EXPECT_TRUE(
+ Identity(implicit_cast<partial_ordering>(strong_ordering::less) <= 0));
+ EXPECT_TRUE(
+ Identity(implicit_cast<partial_ordering>(strong_ordering::equal) == 0));
+ EXPECT_TRUE(Identity(
+ implicit_cast<partial_ordering>(strong_ordering::equivalent) == 0));
+ EXPECT_TRUE(
+ Identity(implicit_cast<partial_ordering>(strong_ordering::greater) != 0));
+ EXPECT_TRUE(
+ Identity(implicit_cast<partial_ordering>(strong_ordering::greater) > 0));
+ EXPECT_TRUE(
+ Identity(implicit_cast<partial_ordering>(strong_ordering::greater) >= 0));
+
+ EXPECT_TRUE(
+ Identity(implicit_cast<weak_ordering>(strong_ordering::less) != 0));
+ EXPECT_TRUE(
+ Identity(implicit_cast<weak_ordering>(strong_ordering::less) < 0));
+ EXPECT_TRUE(
+ Identity(implicit_cast<weak_ordering>(strong_ordering::less) <= 0));
+ EXPECT_TRUE(
+ Identity(implicit_cast<weak_ordering>(strong_ordering::equal) == 0));
+ EXPECT_TRUE(
+ Identity(implicit_cast<weak_ordering>(strong_ordering::equivalent) == 0));
+ EXPECT_TRUE(
+ Identity(implicit_cast<weak_ordering>(strong_ordering::greater) != 0));
+ EXPECT_TRUE(
+ Identity(implicit_cast<weak_ordering>(strong_ordering::greater) > 0));
+ EXPECT_TRUE(
+ Identity(implicit_cast<weak_ordering>(strong_ordering::greater) >= 0));
+}
+
+struct WeakOrderingLess {
+ template <typename T>
+ absl::weak_ordering operator()(const T& a, const T& b) const {
+ return a < b ? absl::weak_ordering::less
+ : a == b ? absl::weak_ordering::equivalent
+ : absl::weak_ordering::greater;
+ }
+};
+
+TEST(CompareResultAsLessThan, SanityTest) {
+ EXPECT_FALSE(absl::compare_internal::compare_result_as_less_than(false));
+ EXPECT_TRUE(absl::compare_internal::compare_result_as_less_than(true));
+
+ EXPECT_TRUE(
+ absl::compare_internal::compare_result_as_less_than(weak_ordering::less));
+ EXPECT_FALSE(absl::compare_internal::compare_result_as_less_than(
+ weak_ordering::equivalent));
+ EXPECT_FALSE(absl::compare_internal::compare_result_as_less_than(
+ weak_ordering::greater));
+}
+
+TEST(DoLessThanComparison, SanityTest) {
+ std::less<int> less;
+ WeakOrderingLess weak;
+
+ EXPECT_TRUE(absl::compare_internal::do_less_than_comparison(less, -1, 0));
+ EXPECT_TRUE(absl::compare_internal::do_less_than_comparison(weak, -1, 0));
+
+ EXPECT_FALSE(absl::compare_internal::do_less_than_comparison(less, 10, 10));
+ EXPECT_FALSE(absl::compare_internal::do_less_than_comparison(weak, 10, 10));
+
+ EXPECT_FALSE(absl::compare_internal::do_less_than_comparison(less, 10, 5));
+ EXPECT_FALSE(absl::compare_internal::do_less_than_comparison(weak, 10, 5));
+}
+
+TEST(CompareResultAsOrdering, SanityTest) {
+ EXPECT_TRUE(
+ Identity(absl::compare_internal::compare_result_as_ordering(-1) < 0));
+ EXPECT_FALSE(
+ Identity(absl::compare_internal::compare_result_as_ordering(-1) == 0));
+ EXPECT_FALSE(
+ Identity(absl::compare_internal::compare_result_as_ordering(-1) > 0));
+ EXPECT_TRUE(Identity(absl::compare_internal::compare_result_as_ordering(
+ weak_ordering::less) < 0));
+ EXPECT_FALSE(Identity(absl::compare_internal::compare_result_as_ordering(
+ weak_ordering::less) == 0));
+ EXPECT_FALSE(Identity(absl::compare_internal::compare_result_as_ordering(
+ weak_ordering::less) > 0));
+
+ EXPECT_FALSE(
+ Identity(absl::compare_internal::compare_result_as_ordering(0) < 0));
+ EXPECT_TRUE(
+ Identity(absl::compare_internal::compare_result_as_ordering(0) == 0));
+ EXPECT_FALSE(
+ Identity(absl::compare_internal::compare_result_as_ordering(0) > 0));
+ EXPECT_FALSE(Identity(absl::compare_internal::compare_result_as_ordering(
+ weak_ordering::equivalent) < 0));
+ EXPECT_TRUE(Identity(absl::compare_internal::compare_result_as_ordering(
+ weak_ordering::equivalent) == 0));
+ EXPECT_FALSE(Identity(absl::compare_internal::compare_result_as_ordering(
+ weak_ordering::equivalent) > 0));
+
+ EXPECT_FALSE(
+ Identity(absl::compare_internal::compare_result_as_ordering(1) < 0));
+ EXPECT_FALSE(
+ Identity(absl::compare_internal::compare_result_as_ordering(1) == 0));
+ EXPECT_TRUE(
+ Identity(absl::compare_internal::compare_result_as_ordering(1) > 0));
+ EXPECT_FALSE(Identity(absl::compare_internal::compare_result_as_ordering(
+ weak_ordering::greater) < 0));
+ EXPECT_FALSE(Identity(absl::compare_internal::compare_result_as_ordering(
+ weak_ordering::greater) == 0));
+ EXPECT_TRUE(Identity(absl::compare_internal::compare_result_as_ordering(
+ weak_ordering::greater) > 0));
+}
+
+TEST(DoThreeWayComparison, SanityTest) {
+ std::less<int> less;
+ WeakOrderingLess weak;
+
+ EXPECT_TRUE(Identity(
+ absl::compare_internal::do_three_way_comparison(less, -1, 0) < 0));
+ EXPECT_FALSE(Identity(
+ absl::compare_internal::do_three_way_comparison(less, -1, 0) == 0));
+ EXPECT_FALSE(Identity(
+ absl::compare_internal::do_three_way_comparison(less, -1, 0) > 0));
+ EXPECT_TRUE(Identity(
+ absl::compare_internal::do_three_way_comparison(weak, -1, 0) < 0));
+ EXPECT_FALSE(Identity(
+ absl::compare_internal::do_three_way_comparison(weak, -1, 0) == 0));
+ EXPECT_FALSE(Identity(
+ absl::compare_internal::do_three_way_comparison(weak, -1, 0) > 0));
+
+ EXPECT_FALSE(Identity(
+ absl::compare_internal::do_three_way_comparison(less, 10, 10) < 0));
+ EXPECT_TRUE(Identity(
+ absl::compare_internal::do_three_way_comparison(less, 10, 10) == 0));
+ EXPECT_FALSE(Identity(
+ absl::compare_internal::do_three_way_comparison(less, 10, 10) > 0));
+ EXPECT_FALSE(Identity(
+ absl::compare_internal::do_three_way_comparison(weak, 10, 10) < 0));
+ EXPECT_TRUE(Identity(
+ absl::compare_internal::do_three_way_comparison(weak, 10, 10) == 0));
+ EXPECT_FALSE(Identity(
+ absl::compare_internal::do_three_way_comparison(weak, 10, 10) > 0));
+
+ EXPECT_FALSE(Identity(
+ absl::compare_internal::do_three_way_comparison(less, 10, 5) < 0));
+ EXPECT_FALSE(Identity(
+ absl::compare_internal::do_three_way_comparison(less, 10, 5) == 0));
+ EXPECT_TRUE(Identity(
+ absl::compare_internal::do_three_way_comparison(less, 10, 5) > 0));
+ EXPECT_FALSE(Identity(
+ absl::compare_internal::do_three_way_comparison(weak, 10, 5) < 0));
+ EXPECT_FALSE(Identity(
+ absl::compare_internal::do_three_way_comparison(weak, 10, 5) == 0));
+ EXPECT_TRUE(Identity(
+ absl::compare_internal::do_three_way_comparison(weak, 10, 5) > 0));
+}
+
+#ifdef __cpp_inline_variables
+TEST(Compare, StaticAsserts) {
+ static_assert(weak_equality::equivalent == 0, "");
+ static_assert(weak_equality::nonequivalent != 0, "");
+
+ static_assert(strong_equality::equal == 0, "");
+ static_assert(strong_equality::nonequal != 0, "");
+ static_assert(strong_equality::equivalent == 0, "");
+ static_assert(strong_equality::nonequivalent != 0, "");
+
+ static_assert(partial_ordering::less < 0, "");
+ static_assert(partial_ordering::equivalent == 0, "");
+ static_assert(partial_ordering::greater > 0, "");
+ static_assert(partial_ordering::unordered != 0, "");
+
+ static_assert(weak_ordering::less < 0, "");
+ static_assert(weak_ordering::equivalent == 0, "");
+ static_assert(weak_ordering::greater > 0, "");
+
+ static_assert(strong_ordering::less < 0, "");
+ static_assert(strong_ordering::equal == 0, "");
+ static_assert(strong_ordering::equivalent == 0, "");
+ static_assert(strong_ordering::greater > 0, "");
+}
+#endif // __cpp_inline_variables
+
+} // namespace
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/types/internal/conformance_aliases.h b/third_party/abseil/src/absl/types/internal/conformance_aliases.h
new file mode 100644
index 0000000..0cc6884
--- /dev/null
+++ b/third_party/abseil/src/absl/types/internal/conformance_aliases.h
@@ -0,0 +1,447 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// regularity_aliases.h
+// -----------------------------------------------------------------------------
+//
+// This file contains type aliases of common ConformanceProfiles and Archetypes
+// so that they can be directly used by name without creating them from scratch.
+
+#ifndef ABSL_TYPES_INTERNAL_CONFORMANCE_ALIASES_H_
+#define ABSL_TYPES_INTERNAL_CONFORMANCE_ALIASES_H_
+
+#include "absl/types/internal/conformance_archetype.h"
+#include "absl/types/internal/conformance_profile.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace types_internal {
+
+// Creates both a Profile and a corresponding Archetype with root name "name".
+#define ABSL_INTERNAL_PROFILE_AND_ARCHETYPE_ALIAS(name, ...) \
+ struct name##Profile : __VA_ARGS__ {}; \
+ \
+ using name##Archetype = ::absl::types_internal::Archetype<name##Profile>; \
+ \
+ template <class AbslInternalProfileTag> \
+ using name##Archetype##_ = ::absl::types_internal::Archetype< \
+ ::absl::types_internal::StrongProfileTypedef<name##Profile, \
+ AbslInternalProfileTag>>
+
+ABSL_INTERNAL_PROFILE_AND_ARCHETYPE_ALIAS(
+ HasTrivialDefaultConstructor,
+ ConformanceProfile<default_constructible::trivial>);
+
+ABSL_INTERNAL_PROFILE_AND_ARCHETYPE_ALIAS(
+ HasNothrowDefaultConstructor,
+ ConformanceProfile<default_constructible::nothrow>);
+
+ABSL_INTERNAL_PROFILE_AND_ARCHETYPE_ALIAS(
+ HasDefaultConstructor, ConformanceProfile<default_constructible::yes>);
+
+ABSL_INTERNAL_PROFILE_AND_ARCHETYPE_ALIAS(
+ HasTrivialMoveConstructor, ConformanceProfile<default_constructible::maybe,
+ move_constructible::trivial>);
+
+ABSL_INTERNAL_PROFILE_AND_ARCHETYPE_ALIAS(
+ HasNothrowMoveConstructor, ConformanceProfile<default_constructible::maybe,
+ move_constructible::nothrow>);
+
+ABSL_INTERNAL_PROFILE_AND_ARCHETYPE_ALIAS(
+ HasMoveConstructor,
+ ConformanceProfile<default_constructible::maybe, move_constructible::yes>);
+
+ABSL_INTERNAL_PROFILE_AND_ARCHETYPE_ALIAS(
+ HasTrivialCopyConstructor,
+ ConformanceProfile<default_constructible::maybe, move_constructible::maybe,
+ copy_constructible::trivial>);
+
+ABSL_INTERNAL_PROFILE_AND_ARCHETYPE_ALIAS(
+ HasNothrowCopyConstructor,
+ ConformanceProfile<default_constructible::maybe, move_constructible::maybe,
+ copy_constructible::nothrow>);
+
+ABSL_INTERNAL_PROFILE_AND_ARCHETYPE_ALIAS(
+ HasCopyConstructor,
+ ConformanceProfile<default_constructible::maybe, move_constructible::maybe,
+ copy_constructible::yes>);
+
+ABSL_INTERNAL_PROFILE_AND_ARCHETYPE_ALIAS(
+ HasTrivialMoveAssign,
+ ConformanceProfile<default_constructible::maybe, move_constructible::maybe,
+ copy_constructible::maybe, move_assignable::trivial>);
+
+ABSL_INTERNAL_PROFILE_AND_ARCHETYPE_ALIAS(
+ HasNothrowMoveAssign,
+ ConformanceProfile<default_constructible::maybe, move_constructible::maybe,
+ copy_constructible::maybe, move_assignable::nothrow>);
+
+ABSL_INTERNAL_PROFILE_AND_ARCHETYPE_ALIAS(
+ HasMoveAssign,
+ ConformanceProfile<default_constructible::maybe, move_constructible::maybe,
+ copy_constructible::maybe, move_assignable::yes>);
+
+ABSL_INTERNAL_PROFILE_AND_ARCHETYPE_ALIAS(
+ HasTrivialCopyAssign,
+ ConformanceProfile<default_constructible::maybe, move_constructible::maybe,
+ copy_constructible::maybe, move_assignable::maybe,
+ copy_assignable::trivial>);
+
+ABSL_INTERNAL_PROFILE_AND_ARCHETYPE_ALIAS(
+ HasNothrowCopyAssign,
+ ConformanceProfile<default_constructible::maybe, move_constructible::maybe,
+ copy_constructible::maybe, move_assignable::maybe,
+ copy_assignable::nothrow>);
+
+ABSL_INTERNAL_PROFILE_AND_ARCHETYPE_ALIAS(
+ HasCopyAssign,
+ ConformanceProfile<default_constructible::maybe, move_constructible::maybe,
+ copy_constructible::maybe, move_assignable::maybe,
+ copy_assignable::yes>);
+
+ABSL_INTERNAL_PROFILE_AND_ARCHETYPE_ALIAS(
+ HasTrivialDestructor,
+ ConformanceProfile<default_constructible::maybe, move_constructible::maybe,
+ copy_constructible::maybe, move_assignable::maybe,
+ copy_assignable::maybe, destructible::trivial>);
+
+ABSL_INTERNAL_PROFILE_AND_ARCHETYPE_ALIAS(
+ HasNothrowDestructor,
+ ConformanceProfile<default_constructible::maybe, move_constructible::maybe,
+ copy_constructible::maybe, move_assignable::maybe,
+ copy_assignable::maybe, destructible::nothrow>);
+
+ABSL_INTERNAL_PROFILE_AND_ARCHETYPE_ALIAS(
+ HasDestructor,
+ ConformanceProfile<default_constructible::maybe, move_constructible::maybe,
+ copy_constructible::maybe, move_assignable::maybe,
+ copy_assignable::maybe, destructible::yes>);
+
+ABSL_INTERNAL_PROFILE_AND_ARCHETYPE_ALIAS(
+ HasNothrowEquality,
+ ConformanceProfile<default_constructible::maybe, move_constructible::maybe,
+ copy_constructible::maybe, move_assignable::maybe,
+ copy_assignable::maybe, destructible::maybe,
+ equality_comparable::nothrow>);
+
+ABSL_INTERNAL_PROFILE_AND_ARCHETYPE_ALIAS(
+ HasEquality,
+ ConformanceProfile<default_constructible::maybe, move_constructible::maybe,
+ copy_constructible::maybe, move_assignable::maybe,
+ copy_assignable::maybe, destructible::maybe,
+ equality_comparable::yes>);
+
+ABSL_INTERNAL_PROFILE_AND_ARCHETYPE_ALIAS(
+ HasNothrowInequality,
+ ConformanceProfile<default_constructible::maybe, move_constructible::maybe,
+ copy_constructible::maybe, move_assignable::maybe,
+ copy_assignable::maybe, destructible::maybe,
+ equality_comparable::maybe,
+ inequality_comparable::nothrow>);
+
+ABSL_INTERNAL_PROFILE_AND_ARCHETYPE_ALIAS(
+ HasInequality,
+ ConformanceProfile<default_constructible::maybe, move_constructible::maybe,
+ copy_constructible::maybe, move_assignable::maybe,
+ copy_assignable::maybe, destructible::maybe,
+ equality_comparable::maybe, inequality_comparable::yes>);
+
+ABSL_INTERNAL_PROFILE_AND_ARCHETYPE_ALIAS(
+ HasNothrowLessThan,
+ ConformanceProfile<default_constructible::maybe, move_constructible::maybe,
+ copy_constructible::maybe, move_assignable::maybe,
+ copy_assignable::maybe, destructible::maybe,
+ equality_comparable::maybe, inequality_comparable::maybe,
+ less_than_comparable::nothrow>);
+
+ABSL_INTERNAL_PROFILE_AND_ARCHETYPE_ALIAS(
+ HasLessThan,
+ ConformanceProfile<default_constructible::maybe, move_constructible::maybe,
+ copy_constructible::maybe, move_assignable::maybe,
+ copy_assignable::maybe, destructible::maybe,
+ equality_comparable::maybe, inequality_comparable::maybe,
+ less_than_comparable::yes>);
+
+ABSL_INTERNAL_PROFILE_AND_ARCHETYPE_ALIAS(
+ HasNothrowLessEqual,
+ ConformanceProfile<default_constructible::maybe, move_constructible::maybe,
+ copy_constructible::maybe, move_assignable::maybe,
+ copy_assignable::maybe, destructible::maybe,
+ equality_comparable::maybe, inequality_comparable::maybe,
+ less_than_comparable::maybe,
+ less_equal_comparable::nothrow>);
+
+ABSL_INTERNAL_PROFILE_AND_ARCHETYPE_ALIAS(
+ HasLessEqual,
+ ConformanceProfile<default_constructible::maybe, move_constructible::maybe,
+ copy_constructible::maybe, move_assignable::maybe,
+ copy_assignable::maybe, destructible::maybe,
+ equality_comparable::maybe, inequality_comparable::maybe,
+ less_than_comparable::maybe,
+ less_equal_comparable::yes>);
+
+ABSL_INTERNAL_PROFILE_AND_ARCHETYPE_ALIAS(
+ HasNothrowGreaterEqual,
+ ConformanceProfile<
+ default_constructible::maybe, move_constructible::maybe,
+ copy_constructible::maybe, move_assignable::maybe,
+ copy_assignable::maybe, destructible::maybe, equality_comparable::maybe,
+ inequality_comparable::maybe, less_than_comparable::maybe,
+ less_equal_comparable::maybe, greater_equal_comparable::nothrow>);
+
+ABSL_INTERNAL_PROFILE_AND_ARCHETYPE_ALIAS(
+ HasGreaterEqual,
+ ConformanceProfile<
+ default_constructible::maybe, move_constructible::maybe,
+ copy_constructible::maybe, move_assignable::maybe,
+ copy_assignable::maybe, destructible::maybe, equality_comparable::maybe,
+ inequality_comparable::maybe, less_than_comparable::maybe,
+ less_equal_comparable::maybe, greater_equal_comparable::yes>);
+
+ABSL_INTERNAL_PROFILE_AND_ARCHETYPE_ALIAS(
+ HasNothrowGreaterThan,
+ ConformanceProfile<
+ default_constructible::maybe, move_constructible::maybe,
+ copy_constructible::maybe, move_assignable::maybe,
+ copy_assignable::maybe, destructible::maybe, equality_comparable::maybe,
+ inequality_comparable::maybe, less_than_comparable::maybe,
+ less_equal_comparable::maybe, greater_equal_comparable::maybe,
+ greater_than_comparable::nothrow>);
+
+ABSL_INTERNAL_PROFILE_AND_ARCHETYPE_ALIAS(
+ HasGreaterThan,
+ ConformanceProfile<
+ default_constructible::maybe, move_constructible::maybe,
+ copy_constructible::maybe, move_assignable::maybe,
+ copy_assignable::maybe, destructible::maybe, equality_comparable::maybe,
+ inequality_comparable::maybe, less_than_comparable::maybe,
+ less_equal_comparable::maybe, greater_equal_comparable::maybe,
+ greater_than_comparable::yes>);
+
+ABSL_INTERNAL_PROFILE_AND_ARCHETYPE_ALIAS(
+ HasNothrowSwap,
+ ConformanceProfile<
+ default_constructible::maybe, move_constructible::maybe,
+ copy_constructible::maybe, move_assignable::maybe,
+ copy_assignable::maybe, destructible::maybe, equality_comparable::maybe,
+ inequality_comparable::maybe, less_than_comparable::maybe,
+ less_equal_comparable::maybe, greater_equal_comparable::maybe,
+ greater_than_comparable::maybe, swappable::nothrow>);
+
+ABSL_INTERNAL_PROFILE_AND_ARCHETYPE_ALIAS(
+ HasSwap,
+ ConformanceProfile<
+ default_constructible::maybe, move_constructible::maybe,
+ copy_constructible::maybe, move_assignable::maybe,
+ copy_assignable::maybe, destructible::maybe, equality_comparable::maybe,
+ inequality_comparable::maybe, less_than_comparable::maybe,
+ less_equal_comparable::maybe, greater_equal_comparable::maybe,
+ greater_than_comparable::maybe, swappable::yes>);
+
+ABSL_INTERNAL_PROFILE_AND_ARCHETYPE_ALIAS(
+ HasStdHashSpecialization,
+ ConformanceProfile<
+ default_constructible::maybe, move_constructible::maybe,
+ copy_constructible::maybe, move_assignable::maybe,
+ copy_assignable::maybe, destructible::maybe, equality_comparable::maybe,
+ inequality_comparable::maybe, less_than_comparable::maybe,
+ less_equal_comparable::maybe, greater_equal_comparable::maybe,
+ greater_than_comparable::maybe, swappable::maybe, hashable::yes>);
+
+////////////////////////////////////////////////////////////////////////////////
+//// The remaining aliases are combinations of the previous aliases. ////
+////////////////////////////////////////////////////////////////////////////////
+
+ABSL_INTERNAL_PROFILE_AND_ARCHETYPE_ALIAS(
+ Equatable, CombineProfiles<HasEqualityProfile, HasInequalityProfile>);
+
+ABSL_INTERNAL_PROFILE_AND_ARCHETYPE_ALIAS(
+ Comparable,
+ CombineProfiles<EquatableProfile, HasLessThanProfile, HasLessEqualProfile,
+ HasGreaterEqualProfile, HasGreaterThanProfile>);
+
+ABSL_INTERNAL_PROFILE_AND_ARCHETYPE_ALIAS(
+ NothrowEquatable,
+ CombineProfiles<HasNothrowEqualityProfile, HasNothrowInequalityProfile>);
+
+ABSL_INTERNAL_PROFILE_AND_ARCHETYPE_ALIAS(
+ NothrowComparable,
+ CombineProfiles<NothrowEquatableProfile, HasNothrowLessThanProfile,
+ HasNothrowLessEqualProfile, HasNothrowGreaterEqualProfile,
+ HasNothrowGreaterThanProfile>);
+
+ABSL_INTERNAL_PROFILE_AND_ARCHETYPE_ALIAS(
+ Value,
+ CombineProfiles<HasNothrowMoveConstructorProfile, HasCopyConstructorProfile,
+ HasNothrowMoveAssignProfile, HasCopyAssignProfile,
+ HasNothrowDestructorProfile, HasNothrowSwapProfile>);
+
+ABSL_INTERNAL_PROFILE_AND_ARCHETYPE_ALIAS(
+ EquatableValue, CombineProfiles<EquatableProfile, ValueProfile>);
+
+ABSL_INTERNAL_PROFILE_AND_ARCHETYPE_ALIAS(
+ ComparableValue, CombineProfiles<ComparableProfile, ValueProfile>);
+
+ABSL_INTERNAL_PROFILE_AND_ARCHETYPE_ALIAS(
+ DefaultConstructibleValue,
+ CombineProfiles<HasDefaultConstructorProfile, ValueProfile>);
+
+ABSL_INTERNAL_PROFILE_AND_ARCHETYPE_ALIAS(
+ NothrowMoveConstructible, CombineProfiles<HasNothrowMoveConstructorProfile,
+ HasNothrowDestructorProfile>);
+
+ABSL_INTERNAL_PROFILE_AND_ARCHETYPE_ALIAS(
+ EquatableNothrowMoveConstructible,
+ CombineProfiles<EquatableProfile, NothrowMoveConstructibleProfile>);
+
+ABSL_INTERNAL_PROFILE_AND_ARCHETYPE_ALIAS(
+ ComparableNothrowMoveConstructible,
+ CombineProfiles<ComparableProfile, NothrowMoveConstructibleProfile>);
+
+ABSL_INTERNAL_PROFILE_AND_ARCHETYPE_ALIAS(
+ DefaultConstructibleNothrowMoveConstructible,
+ CombineProfiles<HasDefaultConstructorProfile,
+ NothrowMoveConstructibleProfile>);
+
+ABSL_INTERNAL_PROFILE_AND_ARCHETYPE_ALIAS(
+ CopyConstructible,
+ CombineProfiles<HasNothrowMoveConstructorProfile, HasCopyConstructorProfile,
+ HasNothrowDestructorProfile>);
+
+ABSL_INTERNAL_PROFILE_AND_ARCHETYPE_ALIAS(
+ EquatableCopyConstructible,
+ CombineProfiles<EquatableProfile, CopyConstructibleProfile>);
+
+ABSL_INTERNAL_PROFILE_AND_ARCHETYPE_ALIAS(
+ ComparableCopyConstructible,
+ CombineProfiles<ComparableProfile, CopyConstructibleProfile>);
+
+ABSL_INTERNAL_PROFILE_AND_ARCHETYPE_ALIAS(
+ DefaultConstructibleCopyConstructible,
+ CombineProfiles<HasDefaultConstructorProfile, CopyConstructibleProfile>);
+
+ABSL_INTERNAL_PROFILE_AND_ARCHETYPE_ALIAS(
+ NothrowMovable,
+ CombineProfiles<HasNothrowMoveConstructorProfile,
+ HasNothrowMoveAssignProfile, HasNothrowDestructorProfile,
+ HasNothrowSwapProfile>);
+
+ABSL_INTERNAL_PROFILE_AND_ARCHETYPE_ALIAS(
+ EquatableNothrowMovable,
+ CombineProfiles<EquatableProfile, NothrowMovableProfile>);
+
+ABSL_INTERNAL_PROFILE_AND_ARCHETYPE_ALIAS(
+ ComparableNothrowMovable,
+ CombineProfiles<ComparableProfile, NothrowMovableProfile>);
+
+ABSL_INTERNAL_PROFILE_AND_ARCHETYPE_ALIAS(
+ DefaultConstructibleNothrowMovable,
+ CombineProfiles<HasDefaultConstructorProfile, NothrowMovableProfile>);
+
+ABSL_INTERNAL_PROFILE_AND_ARCHETYPE_ALIAS(
+ TrivialSpecialMemberFunctions,
+ CombineProfiles<HasTrivialDefaultConstructorProfile,
+ HasTrivialMoveConstructorProfile,
+ HasTrivialCopyConstructorProfile,
+ HasTrivialMoveAssignProfile, HasTrivialCopyAssignProfile,
+ HasTrivialDestructorProfile, HasNothrowSwapProfile>);
+
+ABSL_INTERNAL_PROFILE_AND_ARCHETYPE_ALIAS(
+ TriviallyComplete,
+ CombineProfiles<TrivialSpecialMemberFunctionsProfile, ComparableProfile,
+ HasStdHashSpecializationProfile>);
+
+ABSL_INTERNAL_PROFILE_AND_ARCHETYPE_ALIAS(
+ HashableNothrowMoveConstructible,
+ CombineProfiles<HasStdHashSpecializationProfile,
+ NothrowMoveConstructibleProfile>);
+
+ABSL_INTERNAL_PROFILE_AND_ARCHETYPE_ALIAS(
+ HashableCopyConstructible,
+ CombineProfiles<HasStdHashSpecializationProfile, CopyConstructibleProfile>);
+
+ABSL_INTERNAL_PROFILE_AND_ARCHETYPE_ALIAS(
+ HashableNothrowMovable,
+ CombineProfiles<HasStdHashSpecializationProfile, NothrowMovableProfile>);
+
+ABSL_INTERNAL_PROFILE_AND_ARCHETYPE_ALIAS(
+ HashableValue,
+ CombineProfiles<HasStdHashSpecializationProfile, ValueProfile>);
+
+ABSL_INTERNAL_PROFILE_AND_ARCHETYPE_ALIAS(
+ ComparableHashableValue,
+ CombineProfiles<HashableValueProfile, ComparableProfile>);
+
+// The "preferred" profiles that we support in Abseil.
+template <template <class...> class Receiver>
+using ExpandBasicProfiles =
+ Receiver<NothrowMoveConstructibleProfile, CopyConstructibleProfile,
+ NothrowMovableProfile, ValueProfile>;
+
+// The basic profiles except that they are also all Equatable.
+template <template <class...> class Receiver>
+using ExpandBasicEquatableProfiles =
+ Receiver<EquatableNothrowMoveConstructibleProfile,
+ EquatableCopyConstructibleProfile, EquatableNothrowMovableProfile,
+ EquatableValueProfile>;
+
+// The basic profiles except that they are also all Comparable.
+template <template <class...> class Receiver>
+using ExpandBasicComparableProfiles =
+ Receiver<ComparableNothrowMoveConstructibleProfile,
+ ComparableCopyConstructibleProfile,
+ ComparableNothrowMovableProfile, ComparableValueProfile>;
+
+// The basic profiles except that they are also all Hashable.
+template <template <class...> class Receiver>
+using ExpandBasicHashableProfiles =
+ Receiver<HashableNothrowMoveConstructibleProfile,
+ HashableCopyConstructibleProfile, HashableNothrowMovableProfile,
+ HashableValueProfile>;
+
+// The basic profiles except that they are also all DefaultConstructible.
+template <template <class...> class Receiver>
+using ExpandBasicDefaultConstructibleProfiles =
+ Receiver<DefaultConstructibleNothrowMoveConstructibleProfile,
+ DefaultConstructibleCopyConstructibleProfile,
+ DefaultConstructibleNothrowMovableProfile,
+ DefaultConstructibleValueProfile>;
+
+// The type profiles that we support in Abseil (all of the previous lists).
+template <template <class...> class Receiver>
+using ExpandSupportedProfiles = Receiver<
+ NothrowMoveConstructibleProfile, CopyConstructibleProfile,
+ NothrowMovableProfile, ValueProfile,
+ EquatableNothrowMoveConstructibleProfile, EquatableCopyConstructibleProfile,
+ EquatableNothrowMovableProfile, EquatableValueProfile,
+ ComparableNothrowMoveConstructibleProfile,
+ ComparableCopyConstructibleProfile, ComparableNothrowMovableProfile,
+ ComparableValueProfile, DefaultConstructibleNothrowMoveConstructibleProfile,
+ DefaultConstructibleCopyConstructibleProfile,
+ DefaultConstructibleNothrowMovableProfile, DefaultConstructibleValueProfile,
+ HashableNothrowMoveConstructibleProfile, HashableCopyConstructibleProfile,
+ HashableNothrowMovableProfile, HashableValueProfile>;
+
+// TODO(calabrese) Include types that have throwing move constructors, since in
+// practice we still need to support them because of standard library types with
+// (potentially) non-noexcept moves.
+
+} // namespace types_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#undef ABSL_INTERNAL_PROFILE_AND_ARCHETYPE_ALIAS
+
+#endif // ABSL_TYPES_INTERNAL_CONFORMANCE_ALIASES_H_
diff --git a/third_party/abseil/src/absl/types/internal/conformance_archetype.h b/third_party/abseil/src/absl/types/internal/conformance_archetype.h
new file mode 100644
index 0000000..2349e0f
--- /dev/null
+++ b/third_party/abseil/src/absl/types/internal/conformance_archetype.h
@@ -0,0 +1,978 @@
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// conformance_archetype.h
+// -----------------------------------------------------------------------------
+//
+// This file contains a facility for generating "archetypes" of out of
+// "Conformance Profiles" (see "conformance_profiles.h" for more information
+// about Conformance Profiles). An archetype is a type that aims to support the
+// bare minimum requirements of a given Conformance Profile. For instance, an
+// archetype that corresponds to an ImmutableProfile has exactly a nothrow
+// move-constructor, a potentially-throwing copy constructor, a nothrow
+// destructor, with all other special-member-functions deleted. These archetypes
+// are useful for testing to make sure that templates are able to work with the
+// kinds of types that they claim to support (i.e. that they do not accidentally
+// under-constrain),
+//
+// The main type template in this file is the Archetype template, which takes
+// a Conformance Profile as a template argument and its instantiations are a
+// minimum-conforming model of that profile.
+
+#ifndef ABSL_TYPES_INTERNAL_CONFORMANCE_ARCHETYPE_H_
+#define ABSL_TYPES_INTERNAL_CONFORMANCE_ARCHETYPE_H_
+
+#include <cstddef>
+#include <functional>
+#include <type_traits>
+#include <utility>
+
+#include "absl/meta/type_traits.h"
+#include "absl/types/internal/conformance_profile.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace types_internal {
+
+// A minimum-conforming implementation of a type with properties specified in
+// `Prof`, where `Prof` is a valid Conformance Profile.
+template <class Prof, class /*Enabler*/ = void>
+class Archetype;
+
+// Given an Archetype, obtain the properties of the profile associated with that
+// archetype.
+template <class Archetype>
+struct PropertiesOfArchetype;
+
+template <class Prof>
+struct PropertiesOfArchetype<Archetype<Prof>> {
+ using type = PropertiesOfT<Prof>;
+};
+
+template <class Archetype>
+using PropertiesOfArchetypeT = typename PropertiesOfArchetype<Archetype>::type;
+
+// A metafunction to determine if a type is an `Archetype`.
+template <class T>
+struct IsArchetype : std::false_type {};
+
+template <class Prof>
+struct IsArchetype<Archetype<Prof>> : std::true_type {};
+
+// A constructor tag type used when creating an Archetype with internal state.
+struct MakeArchetypeState {};
+
+// Data stored within an archetype that is copied/compared/hashed when the
+// corresponding operations are used.
+using ArchetypeState = std::size_t;
+
+////////////////////////////////////////////////////////////////////////////////
+// This section of the file defines a chain of base classes for Archetype, //
+// where each base defines a specific special member function with the //
+// appropriate properties (deleted, noexcept(false), noexcept, or trivial). //
+////////////////////////////////////////////////////////////////////////////////
+
+// The bottom-most base, which contains the state and the default constructor.
+template <default_constructible DefaultConstructibleValue>
+struct ArchetypeStateBase {
+ static_assert(DefaultConstructibleValue == default_constructible::yes ||
+ DefaultConstructibleValue == default_constructible::nothrow,
+ "");
+
+ ArchetypeStateBase() noexcept(
+ DefaultConstructibleValue ==
+ default_constructible::
+ nothrow) /*Vacuous archetype_state initialization*/ {}
+ explicit ArchetypeStateBase(MakeArchetypeState, ArchetypeState state) noexcept
+ : archetype_state(state) {}
+
+ ArchetypeState archetype_state;
+};
+
+template <>
+struct ArchetypeStateBase<default_constructible::maybe> {
+ explicit ArchetypeStateBase() = delete;
+ explicit ArchetypeStateBase(MakeArchetypeState, ArchetypeState state) noexcept
+ : archetype_state(state) {}
+
+ ArchetypeState archetype_state;
+};
+
+template <>
+struct ArchetypeStateBase<default_constructible::trivial> {
+ ArchetypeStateBase() = default;
+ explicit ArchetypeStateBase(MakeArchetypeState, ArchetypeState state) noexcept
+ : archetype_state(state) {}
+
+ ArchetypeState archetype_state;
+};
+
+// The move-constructor base
+template <default_constructible DefaultConstructibleValue,
+ move_constructible MoveConstructibleValue>
+struct ArchetypeMoveConstructor
+ : ArchetypeStateBase<DefaultConstructibleValue> {
+ static_assert(MoveConstructibleValue == move_constructible::yes ||
+ MoveConstructibleValue == move_constructible::nothrow,
+ "");
+
+ explicit ArchetypeMoveConstructor(MakeArchetypeState,
+ ArchetypeState state) noexcept
+ : ArchetypeStateBase<DefaultConstructibleValue>(MakeArchetypeState(),
+ state) {}
+
+ ArchetypeMoveConstructor() = default;
+ ArchetypeMoveConstructor(ArchetypeMoveConstructor&& other) noexcept(
+ MoveConstructibleValue == move_constructible::nothrow)
+ : ArchetypeStateBase<DefaultConstructibleValue>(MakeArchetypeState(),
+ other.archetype_state) {}
+ ArchetypeMoveConstructor(const ArchetypeMoveConstructor&) = default;
+ ArchetypeMoveConstructor& operator=(ArchetypeMoveConstructor&&) = default;
+ ArchetypeMoveConstructor& operator=(const ArchetypeMoveConstructor&) =
+ default;
+};
+
+template <default_constructible DefaultConstructibleValue>
+struct ArchetypeMoveConstructor<DefaultConstructibleValue,
+ move_constructible::trivial>
+ : ArchetypeStateBase<DefaultConstructibleValue> {
+ explicit ArchetypeMoveConstructor(MakeArchetypeState,
+ ArchetypeState state) noexcept
+ : ArchetypeStateBase<DefaultConstructibleValue>(MakeArchetypeState(),
+ state) {}
+
+ ArchetypeMoveConstructor() = default;
+};
+
+// The copy-constructor base
+template <default_constructible DefaultConstructibleValue,
+ move_constructible MoveConstructibleValue,
+ copy_constructible CopyConstructibleValue>
+struct ArchetypeCopyConstructor
+ : ArchetypeMoveConstructor<DefaultConstructibleValue,
+ MoveConstructibleValue> {
+ static_assert(CopyConstructibleValue == copy_constructible::yes ||
+ CopyConstructibleValue == copy_constructible::nothrow,
+ "");
+ explicit ArchetypeCopyConstructor(MakeArchetypeState,
+ ArchetypeState state) noexcept
+ : ArchetypeMoveConstructor<DefaultConstructibleValue,
+ MoveConstructibleValue>(MakeArchetypeState(),
+ state) {}
+
+ ArchetypeCopyConstructor() = default;
+ ArchetypeCopyConstructor(ArchetypeCopyConstructor&&) = default;
+ ArchetypeCopyConstructor(const ArchetypeCopyConstructor& other) noexcept(
+ CopyConstructibleValue == copy_constructible::nothrow)
+ : ArchetypeMoveConstructor<DefaultConstructibleValue,
+ MoveConstructibleValue>(
+ MakeArchetypeState(), other.archetype_state) {}
+ ArchetypeCopyConstructor& operator=(ArchetypeCopyConstructor&&) = default;
+ ArchetypeCopyConstructor& operator=(const ArchetypeCopyConstructor&) =
+ default;
+};
+
+template <default_constructible DefaultConstructibleValue,
+ move_constructible MoveConstructibleValue>
+struct ArchetypeCopyConstructor<DefaultConstructibleValue,
+ MoveConstructibleValue,
+ copy_constructible::maybe>
+ : ArchetypeMoveConstructor<DefaultConstructibleValue,
+ MoveConstructibleValue> {
+ explicit ArchetypeCopyConstructor(MakeArchetypeState,
+ ArchetypeState state) noexcept
+ : ArchetypeMoveConstructor<DefaultConstructibleValue,
+ MoveConstructibleValue>(MakeArchetypeState(),
+ state) {}
+
+ ArchetypeCopyConstructor() = default;
+ ArchetypeCopyConstructor(ArchetypeCopyConstructor&&) = default;
+ ArchetypeCopyConstructor(const ArchetypeCopyConstructor&) = delete;
+ ArchetypeCopyConstructor& operator=(ArchetypeCopyConstructor&&) = default;
+ ArchetypeCopyConstructor& operator=(const ArchetypeCopyConstructor&) =
+ default;
+};
+
+template <default_constructible DefaultConstructibleValue,
+ move_constructible MoveConstructibleValue>
+struct ArchetypeCopyConstructor<DefaultConstructibleValue,
+ MoveConstructibleValue,
+ copy_constructible::trivial>
+ : ArchetypeMoveConstructor<DefaultConstructibleValue,
+ MoveConstructibleValue> {
+ explicit ArchetypeCopyConstructor(MakeArchetypeState,
+ ArchetypeState state) noexcept
+ : ArchetypeMoveConstructor<DefaultConstructibleValue,
+ MoveConstructibleValue>(MakeArchetypeState(),
+ state) {}
+
+ ArchetypeCopyConstructor() = default;
+};
+
+// The move-assign base
+template <default_constructible DefaultConstructibleValue,
+ move_constructible MoveConstructibleValue,
+ copy_constructible CopyConstructibleValue,
+ move_assignable MoveAssignableValue>
+struct ArchetypeMoveAssign
+ : ArchetypeCopyConstructor<DefaultConstructibleValue,
+ MoveConstructibleValue, CopyConstructibleValue> {
+ static_assert(MoveAssignableValue == move_assignable::yes ||
+ MoveAssignableValue == move_assignable::nothrow,
+ "");
+ explicit ArchetypeMoveAssign(MakeArchetypeState,
+ ArchetypeState state) noexcept
+ : ArchetypeCopyConstructor<DefaultConstructibleValue,
+ MoveConstructibleValue,
+ CopyConstructibleValue>(MakeArchetypeState(),
+ state) {}
+
+ ArchetypeMoveAssign() = default;
+ ArchetypeMoveAssign(ArchetypeMoveAssign&&) = default;
+ ArchetypeMoveAssign(const ArchetypeMoveAssign&) = default;
+ ArchetypeMoveAssign& operator=(ArchetypeMoveAssign&& other) noexcept(
+ MoveAssignableValue == move_assignable::nothrow) {
+ this->archetype_state = other.archetype_state;
+ return *this;
+ }
+
+ ArchetypeMoveAssign& operator=(const ArchetypeMoveAssign&) = default;
+};
+
+template <default_constructible DefaultConstructibleValue,
+ move_constructible MoveConstructibleValue,
+ copy_constructible CopyConstructibleValue>
+struct ArchetypeMoveAssign<DefaultConstructibleValue, MoveConstructibleValue,
+ CopyConstructibleValue, move_assignable::trivial>
+ : ArchetypeCopyConstructor<DefaultConstructibleValue,
+ MoveConstructibleValue, CopyConstructibleValue> {
+ explicit ArchetypeMoveAssign(MakeArchetypeState,
+ ArchetypeState state) noexcept
+ : ArchetypeCopyConstructor<DefaultConstructibleValue,
+ MoveConstructibleValue,
+ CopyConstructibleValue>(MakeArchetypeState(),
+ state) {}
+
+ ArchetypeMoveAssign() = default;
+};
+
+// The copy-assign base
+template <default_constructible DefaultConstructibleValue,
+ move_constructible MoveConstructibleValue,
+ copy_constructible CopyConstructibleValue,
+ move_assignable MoveAssignableValue,
+ copy_assignable CopyAssignableValue>
+struct ArchetypeCopyAssign
+ : ArchetypeMoveAssign<DefaultConstructibleValue, MoveConstructibleValue,
+ CopyConstructibleValue, MoveAssignableValue> {
+ static_assert(CopyAssignableValue == copy_assignable::yes ||
+ CopyAssignableValue == copy_assignable::nothrow,
+ "");
+ explicit ArchetypeCopyAssign(MakeArchetypeState,
+ ArchetypeState state) noexcept
+ : ArchetypeMoveAssign<DefaultConstructibleValue, MoveConstructibleValue,
+ CopyConstructibleValue, MoveAssignableValue>(
+ MakeArchetypeState(), state) {}
+
+ ArchetypeCopyAssign() = default;
+ ArchetypeCopyAssign(ArchetypeCopyAssign&&) = default;
+ ArchetypeCopyAssign(const ArchetypeCopyAssign&) = default;
+ ArchetypeCopyAssign& operator=(ArchetypeCopyAssign&&) = default;
+
+ ArchetypeCopyAssign& operator=(const ArchetypeCopyAssign& other) noexcept(
+ CopyAssignableValue == copy_assignable::nothrow) {
+ this->archetype_state = other.archetype_state;
+ return *this;
+ }
+};
+
+template <default_constructible DefaultConstructibleValue,
+ move_constructible MoveConstructibleValue,
+ copy_constructible CopyConstructibleValue,
+ move_assignable MoveAssignableValue>
+struct ArchetypeCopyAssign<DefaultConstructibleValue, MoveConstructibleValue,
+ CopyConstructibleValue, MoveAssignableValue,
+ copy_assignable::maybe>
+ : ArchetypeMoveAssign<DefaultConstructibleValue, MoveConstructibleValue,
+ CopyConstructibleValue, MoveAssignableValue> {
+ explicit ArchetypeCopyAssign(MakeArchetypeState,
+ ArchetypeState state) noexcept
+ : ArchetypeMoveAssign<DefaultConstructibleValue, MoveConstructibleValue,
+ CopyConstructibleValue, MoveAssignableValue>(
+ MakeArchetypeState(), state) {}
+
+ ArchetypeCopyAssign() = default;
+ ArchetypeCopyAssign(ArchetypeCopyAssign&&) = default;
+ ArchetypeCopyAssign(const ArchetypeCopyAssign&) = default;
+ ArchetypeCopyAssign& operator=(ArchetypeCopyAssign&&) = default;
+ ArchetypeCopyAssign& operator=(const ArchetypeCopyAssign&) = delete;
+};
+
+template <default_constructible DefaultConstructibleValue,
+ move_constructible MoveConstructibleValue,
+ copy_constructible CopyConstructibleValue,
+ move_assignable MoveAssignableValue>
+struct ArchetypeCopyAssign<DefaultConstructibleValue, MoveConstructibleValue,
+ CopyConstructibleValue, MoveAssignableValue,
+ copy_assignable::trivial>
+ : ArchetypeMoveAssign<DefaultConstructibleValue, MoveConstructibleValue,
+ CopyConstructibleValue, MoveAssignableValue> {
+ explicit ArchetypeCopyAssign(MakeArchetypeState,
+ ArchetypeState state) noexcept
+ : ArchetypeMoveAssign<DefaultConstructibleValue, MoveConstructibleValue,
+ CopyConstructibleValue, MoveAssignableValue>(
+ MakeArchetypeState(), state) {}
+
+ ArchetypeCopyAssign() = default;
+};
+
+// The destructor base
+template <default_constructible DefaultConstructibleValue,
+ move_constructible MoveConstructibleValue,
+ copy_constructible CopyConstructibleValue,
+ move_assignable MoveAssignableValue,
+ copy_assignable CopyAssignableValue, destructible DestructibleValue>
+struct ArchetypeDestructor
+ : ArchetypeCopyAssign<DefaultConstructibleValue, MoveConstructibleValue,
+ CopyConstructibleValue, MoveAssignableValue,
+ CopyAssignableValue> {
+ static_assert(DestructibleValue == destructible::yes ||
+ DestructibleValue == destructible::nothrow,
+ "");
+
+ explicit ArchetypeDestructor(MakeArchetypeState,
+ ArchetypeState state) noexcept
+ : ArchetypeCopyAssign<DefaultConstructibleValue, MoveConstructibleValue,
+ CopyConstructibleValue, MoveAssignableValue,
+ CopyAssignableValue>(MakeArchetypeState(), state) {}
+
+ ArchetypeDestructor() = default;
+ ArchetypeDestructor(ArchetypeDestructor&&) = default;
+ ArchetypeDestructor(const ArchetypeDestructor&) = default;
+ ArchetypeDestructor& operator=(ArchetypeDestructor&&) = default;
+ ArchetypeDestructor& operator=(const ArchetypeDestructor&) = default;
+ ~ArchetypeDestructor() noexcept(DestructibleValue == destructible::nothrow) {}
+};
+
+template <default_constructible DefaultConstructibleValue,
+ move_constructible MoveConstructibleValue,
+ copy_constructible CopyConstructibleValue,
+ move_assignable MoveAssignableValue,
+ copy_assignable CopyAssignableValue>
+struct ArchetypeDestructor<DefaultConstructibleValue, MoveConstructibleValue,
+ CopyConstructibleValue, MoveAssignableValue,
+ CopyAssignableValue, destructible::trivial>
+ : ArchetypeCopyAssign<DefaultConstructibleValue, MoveConstructibleValue,
+ CopyConstructibleValue, MoveAssignableValue,
+ CopyAssignableValue> {
+ explicit ArchetypeDestructor(MakeArchetypeState,
+ ArchetypeState state) noexcept
+ : ArchetypeCopyAssign<DefaultConstructibleValue, MoveConstructibleValue,
+ CopyConstructibleValue, MoveAssignableValue,
+ CopyAssignableValue>(MakeArchetypeState(), state) {}
+
+ ArchetypeDestructor() = default;
+};
+
+// An alias to the top of the chain of bases for special-member functions.
+// NOTE: move_constructible::maybe, move_assignable::maybe, and
+// destructible::maybe are handled in the top-level type by way of SFINAE.
+// Because of this, we never instantiate the base classes with
+// move_constructible::maybe, move_assignable::maybe, or destructible::maybe so
+// that we minimize the number of different possible type-template
+// instantiations.
+template <default_constructible DefaultConstructibleValue,
+ move_constructible MoveConstructibleValue,
+ copy_constructible CopyConstructibleValue,
+ move_assignable MoveAssignableValue,
+ copy_assignable CopyAssignableValue, destructible DestructibleValue>
+using ArchetypeSpecialMembersBase = ArchetypeDestructor<
+ DefaultConstructibleValue,
+ MoveConstructibleValue != move_constructible::maybe
+ ? MoveConstructibleValue
+ : move_constructible::nothrow,
+ CopyConstructibleValue,
+ MoveAssignableValue != move_assignable::maybe ? MoveAssignableValue
+ : move_assignable::nothrow,
+ CopyAssignableValue,
+ DestructibleValue != destructible::maybe ? DestructibleValue
+ : destructible::nothrow>;
+
+// A function that is used to create an archetype with some associated state.
+template <class Arch>
+Arch MakeArchetype(ArchetypeState state) noexcept {
+ static_assert(IsArchetype<Arch>::value,
+ "The explicit template argument to MakeArchetype is required "
+ "to be an Archetype.");
+ return Arch(MakeArchetypeState(), state);
+}
+
+// This is used to conditionally delete "copy" and "move" constructors in a way
+// that is consistent with what the ConformanceProfile requires and that also
+// strictly enforces the arguments to the copy/move to not come from implicit
+// conversions when dealing with the Archetype.
+template <class Prof, class T>
+constexpr bool ShouldDeleteConstructor() {
+ return !((PropertiesOfT<Prof>::move_constructible_support !=
+ move_constructible::maybe &&
+ std::is_same<T, Archetype<Prof>>::value) ||
+ (PropertiesOfT<Prof>::copy_constructible_support !=
+ copy_constructible::maybe &&
+ (std::is_same<T, const Archetype<Prof>&>::value ||
+ std::is_same<T, Archetype<Prof>&>::value ||
+ std::is_same<T, const Archetype<Prof>>::value)));
+}
+
+// This is used to conditionally delete "copy" and "move" assigns in a way
+// that is consistent with what the ConformanceProfile requires and that also
+// strictly enforces the arguments to the copy/move to not come from implicit
+// conversions when dealing with the Archetype.
+template <class Prof, class T>
+constexpr bool ShouldDeleteAssign() {
+ return !(
+ (PropertiesOfT<Prof>::move_assignable_support != move_assignable::maybe &&
+ std::is_same<T, Archetype<Prof>>::value) ||
+ (PropertiesOfT<Prof>::copy_assignable_support != copy_assignable::maybe &&
+ (std::is_same<T, const Archetype<Prof>&>::value ||
+ std::is_same<T, Archetype<Prof>&>::value ||
+ std::is_same<T, const Archetype<Prof>>::value)));
+}
+
+// TODO(calabrese) Inherit from a chain of secondary bases to pull in the
+// associated functions of other concepts.
+template <class Prof, class Enabler>
+class Archetype : ArchetypeSpecialMembersBase<
+ PropertiesOfT<Prof>::default_constructible_support,
+ PropertiesOfT<Prof>::move_constructible_support,
+ PropertiesOfT<Prof>::copy_constructible_support,
+ PropertiesOfT<Prof>::move_assignable_support,
+ PropertiesOfT<Prof>::copy_assignable_support,
+ PropertiesOfT<Prof>::destructible_support> {
+ static_assert(std::is_same<Enabler, void>::value,
+ "An explicit type must not be passed as the second template "
+ "argument to 'Archetype`.");
+
+ // The cases mentioned in these static_asserts are expected to be handled in
+ // the partial template specializations of Archetype that follow this
+ // definition.
+ static_assert(PropertiesOfT<Prof>::destructible_support !=
+ destructible::maybe,
+ "");
+ static_assert(PropertiesOfT<Prof>::move_constructible_support !=
+ move_constructible::maybe ||
+ PropertiesOfT<Prof>::copy_constructible_support ==
+ copy_constructible::maybe,
+ "");
+ static_assert(PropertiesOfT<Prof>::move_assignable_support !=
+ move_assignable::maybe ||
+ PropertiesOfT<Prof>::copy_assignable_support ==
+ copy_assignable::maybe,
+ "");
+
+ public:
+ Archetype() = default;
+
+ // Disallow moves when requested, and disallow implicit conversions.
+ template <class T, typename std::enable_if<
+ ShouldDeleteConstructor<Prof, T>()>::type* = nullptr>
+ Archetype(T&&) = delete;
+
+ // Disallow moves when requested, and disallow implicit conversions.
+ template <class T, typename std::enable_if<
+ ShouldDeleteAssign<Prof, T>()>::type* = nullptr>
+ Archetype& operator=(T&&) = delete;
+
+ using ArchetypeSpecialMembersBase<
+ PropertiesOfT<Prof>::default_constructible_support,
+ PropertiesOfT<Prof>::move_constructible_support,
+ PropertiesOfT<Prof>::copy_constructible_support,
+ PropertiesOfT<Prof>::move_assignable_support,
+ PropertiesOfT<Prof>::copy_assignable_support,
+ PropertiesOfT<Prof>::destructible_support>::archetype_state;
+
+ private:
+ explicit Archetype(MakeArchetypeState, ArchetypeState state) noexcept
+ : ArchetypeSpecialMembersBase<
+ PropertiesOfT<Prof>::default_constructible_support,
+ PropertiesOfT<Prof>::move_constructible_support,
+ PropertiesOfT<Prof>::copy_constructible_support,
+ PropertiesOfT<Prof>::move_assignable_support,
+ PropertiesOfT<Prof>::copy_assignable_support,
+ PropertiesOfT<Prof>::destructible_support>(MakeArchetypeState(),
+ state) {}
+
+ friend Archetype MakeArchetype<Archetype>(ArchetypeState) noexcept;
+};
+
+template <class Prof>
+class Archetype<Prof, typename std::enable_if<
+ PropertiesOfT<Prof>::move_constructible_support !=
+ move_constructible::maybe &&
+ PropertiesOfT<Prof>::move_assignable_support ==
+ move_assignable::maybe &&
+ PropertiesOfT<Prof>::destructible_support !=
+ destructible::maybe>::type>
+ : ArchetypeSpecialMembersBase<
+ PropertiesOfT<Prof>::default_constructible_support,
+ PropertiesOfT<Prof>::move_constructible_support,
+ PropertiesOfT<Prof>::copy_constructible_support,
+ PropertiesOfT<Prof>::move_assignable_support,
+ PropertiesOfT<Prof>::copy_assignable_support,
+ PropertiesOfT<Prof>::destructible_support> {
+ public:
+ Archetype() = default;
+ Archetype(Archetype&&) = default;
+ Archetype(const Archetype&) = default;
+ Archetype& operator=(Archetype&&) = delete;
+ Archetype& operator=(const Archetype&) = default;
+
+ // Disallow moves when requested, and disallow implicit conversions.
+ template <class T, typename std::enable_if<
+ ShouldDeleteConstructor<Prof, T>()>::type* = nullptr>
+ Archetype(T&&) = delete;
+
+ // Disallow moves when requested, and disallow implicit conversions.
+ template <class T, typename std::enable_if<
+ ShouldDeleteAssign<Prof, T>()>::type* = nullptr>
+ Archetype& operator=(T&&) = delete;
+
+ using ArchetypeSpecialMembersBase<
+ PropertiesOfT<Prof>::default_constructible_support,
+ PropertiesOfT<Prof>::move_constructible_support,
+ PropertiesOfT<Prof>::copy_constructible_support,
+ PropertiesOfT<Prof>::move_assignable_support,
+ PropertiesOfT<Prof>::copy_assignable_support,
+ PropertiesOfT<Prof>::destructible_support>::archetype_state;
+
+ private:
+ explicit Archetype(MakeArchetypeState, ArchetypeState state) noexcept
+ : ArchetypeSpecialMembersBase<
+ PropertiesOfT<Prof>::default_constructible_support,
+ PropertiesOfT<Prof>::move_constructible_support,
+ PropertiesOfT<Prof>::copy_constructible_support,
+ PropertiesOfT<Prof>::move_assignable_support,
+ PropertiesOfT<Prof>::copy_assignable_support,
+ PropertiesOfT<Prof>::destructible_support>(MakeArchetypeState(),
+ state) {}
+
+ friend Archetype MakeArchetype<Archetype>(ArchetypeState) noexcept;
+};
+
+template <class Prof>
+class Archetype<Prof, typename std::enable_if<
+ PropertiesOfT<Prof>::move_constructible_support ==
+ move_constructible::maybe &&
+ PropertiesOfT<Prof>::move_assignable_support ==
+ move_assignable::maybe &&
+ PropertiesOfT<Prof>::destructible_support !=
+ destructible::maybe>::type>
+ : ArchetypeSpecialMembersBase<
+ PropertiesOfT<Prof>::default_constructible_support,
+ PropertiesOfT<Prof>::move_constructible_support,
+ PropertiesOfT<Prof>::copy_constructible_support,
+ PropertiesOfT<Prof>::move_assignable_support,
+ PropertiesOfT<Prof>::copy_assignable_support,
+ PropertiesOfT<Prof>::destructible_support> {
+ public:
+ Archetype() = default;
+ Archetype(Archetype&&) = delete;
+ Archetype(const Archetype&) = default;
+ Archetype& operator=(Archetype&&) = delete;
+ Archetype& operator=(const Archetype&) = default;
+
+ // Disallow moves when requested, and disallow implicit conversions.
+ template <class T, typename std::enable_if<
+ ShouldDeleteConstructor<Prof, T>()>::type* = nullptr>
+ Archetype(T&&) = delete;
+
+ // Disallow moves when requested, and disallow implicit conversions.
+ template <class T, typename std::enable_if<
+ ShouldDeleteAssign<Prof, T>()>::type* = nullptr>
+ Archetype& operator=(T&&) = delete;
+
+ using ArchetypeSpecialMembersBase<
+ PropertiesOfT<Prof>::default_constructible_support,
+ PropertiesOfT<Prof>::move_constructible_support,
+ PropertiesOfT<Prof>::copy_constructible_support,
+ PropertiesOfT<Prof>::move_assignable_support,
+ PropertiesOfT<Prof>::copy_assignable_support,
+ PropertiesOfT<Prof>::destructible_support>::archetype_state;
+
+ private:
+ explicit Archetype(MakeArchetypeState, ArchetypeState state) noexcept
+ : ArchetypeSpecialMembersBase<
+ PropertiesOfT<Prof>::default_constructible_support,
+ PropertiesOfT<Prof>::move_constructible_support,
+ PropertiesOfT<Prof>::copy_constructible_support,
+ PropertiesOfT<Prof>::move_assignable_support,
+ PropertiesOfT<Prof>::copy_assignable_support,
+ PropertiesOfT<Prof>::destructible_support>(MakeArchetypeState(),
+ state) {}
+
+ friend Archetype MakeArchetype<Archetype>(ArchetypeState) noexcept;
+};
+
+template <class Prof>
+class Archetype<Prof, typename std::enable_if<
+ PropertiesOfT<Prof>::move_constructible_support ==
+ move_constructible::maybe &&
+ PropertiesOfT<Prof>::move_assignable_support !=
+ move_assignable::maybe &&
+ PropertiesOfT<Prof>::destructible_support !=
+ destructible::maybe>::type>
+ : ArchetypeSpecialMembersBase<
+ PropertiesOfT<Prof>::default_constructible_support,
+ PropertiesOfT<Prof>::move_constructible_support,
+ PropertiesOfT<Prof>::copy_constructible_support,
+ PropertiesOfT<Prof>::move_assignable_support,
+ PropertiesOfT<Prof>::copy_assignable_support,
+ PropertiesOfT<Prof>::destructible_support> {
+ public:
+ Archetype() = default;
+ Archetype(Archetype&&) = delete;
+ Archetype(const Archetype&) = default;
+ Archetype& operator=(Archetype&&) = default;
+ Archetype& operator=(const Archetype&) = default;
+
+ // Disallow moves when requested, and disallow implicit conversions.
+ template <class T, typename std::enable_if<
+ ShouldDeleteConstructor<Prof, T>()>::type* = nullptr>
+ Archetype(T&&) = delete;
+
+ // Disallow moves when requested, and disallow implicit conversions.
+ template <class T, typename std::enable_if<
+ ShouldDeleteAssign<Prof, T>()>::type* = nullptr>
+ Archetype& operator=(T&&) = delete;
+
+ using ArchetypeSpecialMembersBase<
+ PropertiesOfT<Prof>::default_constructible_support,
+ PropertiesOfT<Prof>::move_constructible_support,
+ PropertiesOfT<Prof>::copy_constructible_support,
+ PropertiesOfT<Prof>::move_assignable_support,
+ PropertiesOfT<Prof>::copy_assignable_support,
+ PropertiesOfT<Prof>::destructible_support>::archetype_state;
+
+ private:
+ explicit Archetype(MakeArchetypeState, ArchetypeState state) noexcept
+ : ArchetypeSpecialMembersBase<
+ PropertiesOfT<Prof>::default_constructible_support,
+ PropertiesOfT<Prof>::move_constructible_support,
+ PropertiesOfT<Prof>::copy_constructible_support,
+ PropertiesOfT<Prof>::move_assignable_support,
+ PropertiesOfT<Prof>::copy_assignable_support,
+ PropertiesOfT<Prof>::destructible_support>(MakeArchetypeState(),
+ state) {}
+
+ friend Archetype MakeArchetype<Archetype>(ArchetypeState) noexcept;
+};
+
+template <class Prof>
+class Archetype<Prof, typename std::enable_if<
+ PropertiesOfT<Prof>::move_constructible_support !=
+ move_constructible::maybe &&
+ PropertiesOfT<Prof>::move_assignable_support ==
+ move_assignable::maybe &&
+ PropertiesOfT<Prof>::destructible_support ==
+ destructible::maybe>::type>
+ : ArchetypeSpecialMembersBase<
+ PropertiesOfT<Prof>::default_constructible_support,
+ PropertiesOfT<Prof>::move_constructible_support,
+ PropertiesOfT<Prof>::copy_constructible_support,
+ PropertiesOfT<Prof>::move_assignable_support,
+ PropertiesOfT<Prof>::copy_assignable_support,
+ PropertiesOfT<Prof>::destructible_support> {
+ public:
+ Archetype() = default;
+ Archetype(Archetype&&) = default;
+ Archetype(const Archetype&) = default;
+ Archetype& operator=(Archetype&&) = delete;
+ Archetype& operator=(const Archetype&) = default;
+ ~Archetype() = delete;
+
+ // Disallow moves when requested, and disallow implicit conversions.
+ template <class T, typename std::enable_if<
+ ShouldDeleteConstructor<Prof, T>()>::type* = nullptr>
+ Archetype(T&&) = delete;
+
+ // Disallow moves when requested, and disallow implicit conversions.
+ template <class T, typename std::enable_if<
+ ShouldDeleteAssign<Prof, T>()>::type* = nullptr>
+ Archetype& operator=(T&&) = delete;
+
+ using ArchetypeSpecialMembersBase<
+ PropertiesOfT<Prof>::default_constructible_support,
+ PropertiesOfT<Prof>::move_constructible_support,
+ PropertiesOfT<Prof>::copy_constructible_support,
+ PropertiesOfT<Prof>::move_assignable_support,
+ PropertiesOfT<Prof>::copy_assignable_support,
+ PropertiesOfT<Prof>::destructible_support>::archetype_state;
+
+ private:
+ explicit Archetype(MakeArchetypeState, ArchetypeState state) noexcept
+ : ArchetypeSpecialMembersBase<
+ PropertiesOfT<Prof>::default_constructible_support,
+ PropertiesOfT<Prof>::move_constructible_support,
+ PropertiesOfT<Prof>::copy_constructible_support,
+ PropertiesOfT<Prof>::move_assignable_support,
+ PropertiesOfT<Prof>::copy_assignable_support,
+ PropertiesOfT<Prof>::destructible_support>(MakeArchetypeState(),
+ state) {}
+
+ friend Archetype MakeArchetype<Archetype>(ArchetypeState) noexcept;
+};
+
+template <class Prof>
+class Archetype<Prof, typename std::enable_if<
+ PropertiesOfT<Prof>::move_constructible_support ==
+ move_constructible::maybe &&
+ PropertiesOfT<Prof>::move_assignable_support ==
+ move_assignable::maybe &&
+ PropertiesOfT<Prof>::destructible_support ==
+ destructible::maybe>::type>
+ : ArchetypeSpecialMembersBase<
+ PropertiesOfT<Prof>::default_constructible_support,
+ PropertiesOfT<Prof>::move_constructible_support,
+ PropertiesOfT<Prof>::copy_constructible_support,
+ PropertiesOfT<Prof>::move_assignable_support,
+ PropertiesOfT<Prof>::copy_assignable_support,
+ PropertiesOfT<Prof>::destructible_support> {
+ public:
+ Archetype() = default;
+ Archetype(Archetype&&) = delete;
+ Archetype(const Archetype&) = default;
+ Archetype& operator=(Archetype&&) = delete;
+ Archetype& operator=(const Archetype&) = default;
+ ~Archetype() = delete;
+
+ // Disallow moves when requested, and disallow implicit conversions.
+ template <class T, typename std::enable_if<
+ ShouldDeleteConstructor<Prof, T>()>::type* = nullptr>
+ Archetype(T&&) = delete;
+
+ // Disallow moves when requested, and disallow implicit conversions.
+ template <class T, typename std::enable_if<
+ ShouldDeleteAssign<Prof, T>()>::type* = nullptr>
+ Archetype& operator=(T&&) = delete;
+
+ using ArchetypeSpecialMembersBase<
+ PropertiesOfT<Prof>::default_constructible_support,
+ PropertiesOfT<Prof>::move_constructible_support,
+ PropertiesOfT<Prof>::copy_constructible_support,
+ PropertiesOfT<Prof>::move_assignable_support,
+ PropertiesOfT<Prof>::copy_assignable_support,
+ PropertiesOfT<Prof>::destructible_support>::archetype_state;
+
+ private:
+ explicit Archetype(MakeArchetypeState, ArchetypeState state) noexcept
+ : ArchetypeSpecialMembersBase<
+ PropertiesOfT<Prof>::default_constructible_support,
+ PropertiesOfT<Prof>::move_constructible_support,
+ PropertiesOfT<Prof>::copy_constructible_support,
+ PropertiesOfT<Prof>::move_assignable_support,
+ PropertiesOfT<Prof>::copy_assignable_support,
+ PropertiesOfT<Prof>::destructible_support>(MakeArchetypeState(),
+ state) {}
+
+ friend Archetype MakeArchetype<Archetype>(ArchetypeState) noexcept;
+};
+
+template <class Prof>
+class Archetype<Prof, typename std::enable_if<
+ PropertiesOfT<Prof>::move_constructible_support ==
+ move_constructible::maybe &&
+ PropertiesOfT<Prof>::move_assignable_support !=
+ move_assignable::maybe &&
+ PropertiesOfT<Prof>::destructible_support ==
+ destructible::maybe>::type>
+ : ArchetypeSpecialMembersBase<
+ PropertiesOfT<Prof>::default_constructible_support,
+ PropertiesOfT<Prof>::move_constructible_support,
+ PropertiesOfT<Prof>::copy_constructible_support,
+ PropertiesOfT<Prof>::move_assignable_support,
+ PropertiesOfT<Prof>::copy_assignable_support,
+ PropertiesOfT<Prof>::destructible_support> {
+ public:
+ Archetype() = default;
+ Archetype(Archetype&&) = delete;
+ Archetype(const Archetype&) = default;
+ Archetype& operator=(Archetype&&) = default;
+ Archetype& operator=(const Archetype&) = default;
+ ~Archetype() = delete;
+
+ // Disallow moves when requested, and disallow implicit conversions.
+ template <class T, typename std::enable_if<
+ ShouldDeleteConstructor<Prof, T>()>::type* = nullptr>
+ Archetype(T&&) = delete;
+
+ // Disallow moves when requested, and disallow implicit conversions.
+ template <class T, typename std::enable_if<
+ ShouldDeleteAssign<Prof, T>()>::type* = nullptr>
+ Archetype& operator=(T&&) = delete;
+
+ using ArchetypeSpecialMembersBase<
+ PropertiesOfT<Prof>::default_constructible_support,
+ PropertiesOfT<Prof>::move_constructible_support,
+ PropertiesOfT<Prof>::copy_constructible_support,
+ PropertiesOfT<Prof>::move_assignable_support,
+ PropertiesOfT<Prof>::copy_assignable_support,
+ PropertiesOfT<Prof>::destructible_support>::archetype_state;
+
+ private:
+ explicit Archetype(MakeArchetypeState, ArchetypeState state) noexcept
+ : ArchetypeSpecialMembersBase<
+ PropertiesOfT<Prof>::default_constructible_support,
+ PropertiesOfT<Prof>::move_constructible_support,
+ PropertiesOfT<Prof>::copy_constructible_support,
+ PropertiesOfT<Prof>::move_assignable_support,
+ PropertiesOfT<Prof>::copy_assignable_support,
+ PropertiesOfT<Prof>::destructible_support>(MakeArchetypeState(),
+ state) {}
+
+ friend Archetype MakeArchetype<Archetype>(ArchetypeState) noexcept;
+};
+
+// Explicitly deleted swap for Archetype if the profile does not require swap.
+// It is important to delete it rather than simply leave it out so that the
+// "using std::swap;" idiom will result in this deleted overload being picked.
+template <class Prof,
+ absl::enable_if_t<!PropertiesOfT<Prof>::is_swappable, int> = 0>
+void swap(Archetype<Prof>&, Archetype<Prof>&) = delete; // NOLINT
+
+// A conditionally-noexcept swap implementation for Archetype when the profile
+// supports swap.
+template <class Prof,
+ absl::enable_if_t<PropertiesOfT<Prof>::is_swappable, int> = 0>
+void swap(Archetype<Prof>& lhs, Archetype<Prof>& rhs) // NOLINT
+ noexcept(PropertiesOfT<Prof>::swappable_support != swappable::yes) {
+ std::swap(lhs.archetype_state, rhs.archetype_state);
+}
+
+// A convertible-to-bool type that is used as the return type of comparison
+// operators since the standard doesn't always require exactly bool.
+struct NothrowBool {
+ explicit NothrowBool() = delete;
+ ~NothrowBool() = default;
+
+ // TODO(calabrese) Delete the copy constructor in C++17 mode since guaranteed
+ // elision makes it not required when returning from a function.
+ // NothrowBool(NothrowBool const&) = delete;
+
+ NothrowBool& operator=(NothrowBool const&) = delete;
+
+ explicit operator bool() const noexcept { return value; }
+
+ static NothrowBool make(bool const value) noexcept {
+ return NothrowBool(value);
+ }
+
+ private:
+ explicit NothrowBool(bool const value) noexcept : value(value) {}
+
+ bool value;
+};
+
+// A convertible-to-bool type that is used as the return type of comparison
+// operators since the standard doesn't always require exactly bool.
+// Note: ExceptionalBool has a conversion operator that is not noexcept, so
+// that even when a comparison operator is noexcept, that operation may still
+// potentially throw when converted to bool.
+struct ExceptionalBool {
+ explicit ExceptionalBool() = delete;
+ ~ExceptionalBool() = default;
+
+ // TODO(calabrese) Delete the copy constructor in C++17 mode since guaranteed
+ // elision makes it not required when returning from a function.
+ // ExceptionalBool(ExceptionalBool const&) = delete;
+
+ ExceptionalBool& operator=(ExceptionalBool const&) = delete;
+
+ explicit operator bool() const { return value; } // NOLINT
+
+ static ExceptionalBool make(bool const value) noexcept {
+ return ExceptionalBool(value);
+ }
+
+ private:
+ explicit ExceptionalBool(bool const value) noexcept : value(value) {}
+
+ bool value;
+};
+
+// The following macro is only used as a helper in this file to stamp out
+// comparison operator definitions. It is undefined after usage.
+//
+// NOTE: Non-nothrow operators throw via their result's conversion to bool even
+// though the operation itself is noexcept.
+#define ABSL_TYPES_INTERNAL_OP(enum_name, op) \
+ template <class Prof> \
+ absl::enable_if_t<!PropertiesOfT<Prof>::is_##enum_name, bool> operator op( \
+ const Archetype<Prof>&, const Archetype<Prof>&) = delete; \
+ \
+ template <class Prof> \
+ typename absl::enable_if_t< \
+ PropertiesOfT<Prof>::is_##enum_name, \
+ std::conditional<PropertiesOfT<Prof>::enum_name##_support == \
+ enum_name::nothrow, \
+ NothrowBool, ExceptionalBool>>::type \
+ operator op(const Archetype<Prof>& lhs, \
+ const Archetype<Prof>& rhs) noexcept { \
+ return absl::conditional_t< \
+ PropertiesOfT<Prof>::enum_name##_support == enum_name::nothrow, \
+ NothrowBool, ExceptionalBool>::make(lhs.archetype_state op \
+ rhs.archetype_state); \
+ }
+
+ABSL_TYPES_INTERNAL_OP(equality_comparable, ==);
+ABSL_TYPES_INTERNAL_OP(inequality_comparable, !=);
+ABSL_TYPES_INTERNAL_OP(less_than_comparable, <);
+ABSL_TYPES_INTERNAL_OP(less_equal_comparable, <=);
+ABSL_TYPES_INTERNAL_OP(greater_equal_comparable, >=);
+ABSL_TYPES_INTERNAL_OP(greater_than_comparable, >);
+
+#undef ABSL_TYPES_INTERNAL_OP
+
+// Base class for std::hash specializations when an Archetype doesn't support
+// hashing.
+struct PoisonedHash {
+ PoisonedHash() = delete;
+ PoisonedHash(const PoisonedHash&) = delete;
+ PoisonedHash& operator=(const PoisonedHash&) = delete;
+};
+
+// Base class for std::hash specializations when an Archetype supports hashing.
+template <class Prof>
+struct EnabledHash {
+ using argument_type = Archetype<Prof>;
+ using result_type = std::size_t;
+ result_type operator()(const argument_type& arg) const {
+ return std::hash<ArchetypeState>()(arg.archetype_state);
+ }
+};
+
+} // namespace types_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+namespace std {
+
+template <class Prof> // NOLINT
+struct hash<::absl::types_internal::Archetype<Prof>>
+ : conditional<::absl::types_internal::PropertiesOfT<Prof>::is_hashable,
+ ::absl::types_internal::EnabledHash<Prof>,
+ ::absl::types_internal::PoisonedHash>::type {};
+
+} // namespace std
+
+#endif // ABSL_TYPES_INTERNAL_CONFORMANCE_ARCHETYPE_H_
diff --git a/third_party/abseil/src/absl/types/internal/conformance_profile.h b/third_party/abseil/src/absl/types/internal/conformance_profile.h
new file mode 100644
index 0000000..cf64ff4
--- /dev/null
+++ b/third_party/abseil/src/absl/types/internal/conformance_profile.h
@@ -0,0 +1,931 @@
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// conformance_profiles.h
+// -----------------------------------------------------------------------------
+//
+// This file contains templates for representing "Regularity Profiles" and
+// concisely-named versions of commonly used Regularity Profiles.
+//
+// A Regularity Profile is a compile-time description of the types of operations
+// that a given type supports, along with properties of those operations when
+// they do exist. For instance, a Regularity Profile may describe a type that
+// has a move-constructor that is noexcept and a copy constructor that is not
+// noexcept. This description can then be examined and passed around to other
+// templates for the purposes of asserting expectations on user-defined types
+// via a series trait checks, or for determining what kinds of run-time tests
+// are able to be performed.
+//
+// Regularity Profiles are also used when creating "archetypes," which are
+// minimum-conforming types that meet all of the requirements of a given
+// Regularity Profile. For more information regarding archetypes, see
+// "conformance_archetypes.h".
+
+#ifndef ABSL_TYPES_INTERNAL_CONFORMANCE_PROFILE_H_
+#define ABSL_TYPES_INTERNAL_CONFORMANCE_PROFILE_H_
+
+#include <set>
+#include <type_traits>
+#include <utility>
+#include <vector>
+
+#include "gtest/gtest.h"
+#include "absl/algorithm/container.h"
+#include "absl/meta/type_traits.h"
+#include "absl/strings/ascii.h"
+#include "absl/strings/str_cat.h"
+#include "absl/strings/string_view.h"
+#include "absl/types/internal/conformance_testing_helpers.h"
+#include "absl/utility/utility.h"
+
+// TODO(calabrese) Add support for extending profiles.
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace types_internal {
+
+// Converts an enum to its underlying integral value.
+template <typename Enum>
+constexpr absl::underlying_type_t<Enum> UnderlyingValue(Enum value) {
+ return static_cast<absl::underlying_type_t<Enum>>(value);
+}
+
+// A tag type used in place of a matcher when checking that an assertion result
+// does not actually contain any errors.
+struct NoError {};
+
+// -----------------------------------------------------------------------------
+// ConformanceErrors
+// -----------------------------------------------------------------------------
+class ConformanceErrors {
+ public:
+ // Setup the error reporting mechanism by seeding it with the name of the type
+ // that is being tested.
+ explicit ConformanceErrors(std::string type_name)
+ : assertion_result_(false), type_name_(std::move(type_name)) {
+ assertion_result_ << "\n\n"
+ "Assuming the following type alias:\n"
+ "\n"
+ " using _T = "
+ << type_name_ << ";\n\n";
+ outputDivider();
+ }
+
+ // Adds the test name to the list of successfully run tests iff it was not
+ // previously reported as failing. This behavior is useful for tests that
+ // have multiple parts, where failures and successes are reported individually
+ // with the same test name.
+ void addTestSuccess(absl::string_view test_name) {
+ auto normalized_test_name = absl::AsciiStrToLower(test_name);
+
+ // If the test is already reported as failing, do not add it to the list of
+ // successes.
+ if (test_failures_.find(normalized_test_name) == test_failures_.end()) {
+ test_successes_.insert(std::move(normalized_test_name));
+ }
+ }
+
+ // Streams a single error description into the internal buffer (a visual
+ // divider is automatically inserted after the error so that multiple errors
+ // are visibly distinct).
+ //
+ // This function increases the error count by 1.
+ //
+ // TODO(calabrese) Determine desired behavior when if this function throws.
+ template <class... P>
+ void addTestFailure(absl::string_view test_name, const P&... args) {
+ // Output a message related to the test failure.
+ assertion_result_ << "\n\n"
+ "Failed test: "
+ << test_name << "\n\n";
+ addTestFailureImpl(args...);
+ assertion_result_ << "\n\n";
+ outputDivider();
+
+ auto normalized_test_name = absl::AsciiStrToLower(test_name);
+
+ // If previous parts of this test succeeded, remove it from that set.
+ test_successes_.erase(normalized_test_name);
+
+ // Add the test name to the list of failed tests.
+ test_failures_.insert(std::move(normalized_test_name));
+
+ has_error_ = true;
+ }
+
+ // Convert this object into a testing::AssertionResult instance such that it
+ // can be used with gtest.
+ ::testing::AssertionResult assertionResult() const {
+ return has_error_ ? assertion_result_ : ::testing::AssertionSuccess();
+ }
+
+ // Convert this object into a testing::AssertionResult instance such that it
+ // can be used with gtest. This overload expects errors, using the specified
+ // matcher.
+ ::testing::AssertionResult expectFailedTests(
+ const std::set<std::string>& test_names) const {
+ // Since we are expecting nonconformance, output an error message when the
+ // type actually conformed to the specified profile.
+ if (!has_error_) {
+ return ::testing::AssertionFailure()
+ << "Unexpected conformance of type:\n"
+ " "
+ << type_name_ << "\n\n";
+ }
+
+ // Get a list of all expected failures that did not actually fail
+ // (or that were not run).
+ std::vector<std::string> nonfailing_tests;
+ absl::c_set_difference(test_names, test_failures_,
+ std::back_inserter(nonfailing_tests));
+
+ // Get a list of all "expected failures" that were never actually run.
+ std::vector<std::string> unrun_tests;
+ absl::c_set_difference(nonfailing_tests, test_successes_,
+ std::back_inserter(unrun_tests));
+
+ // Report when the user specified tests that were not run.
+ if (!unrun_tests.empty()) {
+ const bool tests_were_run =
+ !(test_failures_.empty() && test_successes_.empty());
+
+ // Prepare an assertion result used in the case that tests pass that were
+ // expected to fail.
+ ::testing::AssertionResult result = ::testing::AssertionFailure();
+ result << "When testing type:\n " << type_name_
+ << "\n\nThe following tests were expected to fail but were not "
+ "run";
+
+ if (tests_were_run) result << " (was the test name spelled correctly?)";
+
+ result << ":\n\n";
+
+ // List all of the tests that unexpectedly passed.
+ for (const auto& test_name : unrun_tests) {
+ result << " " << test_name << "\n";
+ }
+
+ if (!tests_were_run) result << "\nNo tests were run.";
+
+ if (!test_failures_.empty()) {
+ // List test failures
+ result << "\nThe tests that were run and failed are:\n\n";
+ for (const auto& test_name : test_failures_) {
+ result << " " << test_name << "\n";
+ }
+ }
+
+ if (!test_successes_.empty()) {
+ // List test successes
+ result << "\nThe tests that were run and succeeded are:\n\n";
+ for (const auto& test_name : test_successes_) {
+ result << " " << test_name << "\n";
+ }
+ }
+
+ return result;
+ }
+
+ // If some tests passed when they were expected to fail, alert the caller.
+ if (nonfailing_tests.empty()) return ::testing::AssertionSuccess();
+
+ // Prepare an assertion result used in the case that tests pass that were
+ // expected to fail.
+ ::testing::AssertionResult unexpected_successes =
+ ::testing::AssertionFailure();
+ unexpected_successes << "When testing type:\n " << type_name_
+ << "\n\nThe following tests passed when they were "
+ "expected to fail:\n\n";
+
+ // List all of the tests that unexpectedly passed.
+ for (const auto& test_name : nonfailing_tests) {
+ unexpected_successes << " " << test_name << "\n";
+ }
+
+ return unexpected_successes;
+ }
+
+ private:
+ void outputDivider() {
+ assertion_result_ << "========================================";
+ }
+
+ void addTestFailureImpl() {}
+
+ template <class H, class... T>
+ void addTestFailureImpl(const H& head, const T&... tail) {
+ assertion_result_ << head;
+ addTestFailureImpl(tail...);
+ }
+
+ ::testing::AssertionResult assertion_result_;
+ std::set<std::string> test_failures_;
+ std::set<std::string> test_successes_;
+ std::string type_name_;
+ bool has_error_ = false;
+};
+
+template <class T, class /*Enabler*/ = void>
+struct PropertiesOfImpl {};
+
+template <class T>
+struct PropertiesOfImpl<T, absl::void_t<typename T::properties>> {
+ using type = typename T::properties;
+};
+
+template <class T>
+struct PropertiesOfImpl<T, absl::void_t<typename T::profile_alias_of>> {
+ using type = typename PropertiesOfImpl<typename T::profile_alias_of>::type;
+};
+
+template <class T>
+struct PropertiesOf : PropertiesOfImpl<T> {};
+
+template <class T>
+using PropertiesOfT = typename PropertiesOf<T>::type;
+
+// NOTE: These enums use this naming convention to be consistent with the
+// standard trait names, which is useful since it allows us to match up each
+// enum name with a corresponding trait name in macro definitions.
+
+// An enum that describes the various expectations on an operations existence.
+enum class function_support { maybe, yes, nothrow, trivial };
+
+constexpr const char* PessimisticPropertyDescription(function_support v) {
+ return v == function_support::maybe
+ ? "no"
+ : v == function_support::yes
+ ? "yes, potentially throwing"
+ : v == function_support::nothrow ? "yes, nothrow"
+ : "yes, trivial";
+}
+
+// Return a string that describes the kind of property support that was
+// expected.
+inline std::string ExpectedFunctionKindList(function_support min,
+ function_support max) {
+ if (min == max) {
+ std::string result =
+ absl::StrCat("Expected:\n ",
+ PessimisticPropertyDescription(
+ static_cast<function_support>(UnderlyingValue(min))),
+ "\n");
+ return result;
+ }
+
+ std::string result = "Expected one of:\n";
+ for (auto curr_support = UnderlyingValue(min);
+ curr_support <= UnderlyingValue(max); ++curr_support) {
+ absl::StrAppend(&result, " ",
+ PessimisticPropertyDescription(
+ static_cast<function_support>(curr_support)),
+ "\n");
+ }
+
+ return result;
+}
+
+template <class Enum>
+void ExpectModelOfImpl(ConformanceErrors* errors, Enum min_support,
+ Enum max_support, Enum kind) {
+ const auto kind_value = UnderlyingValue(kind);
+ const auto min_support_value = UnderlyingValue(min_support);
+ const auto max_support_value = UnderlyingValue(max_support);
+
+ if (!(kind_value >= min_support_value && kind_value <= max_support_value)) {
+ errors->addTestFailure(
+ PropertyName(kind), "**Failed property expectation**\n\n",
+ ExpectedFunctionKindList(
+ static_cast<function_support>(min_support_value),
+ static_cast<function_support>(max_support_value)),
+ '\n', "Actual:\n ",
+ PessimisticPropertyDescription(
+ static_cast<function_support>(kind_value)));
+ } else {
+ errors->addTestSuccess(PropertyName(kind));
+ }
+}
+
+#define ABSL_INTERNAL_SPECIAL_MEMBER_FUNCTION_ENUM(description, name) \
+ enum class name { maybe, yes, nothrow, trivial }; \
+ \
+ constexpr const char* PropertyName(name v) { return description; } \
+ static_assert(true, "") // Force a semicolon when using this macro.
+
+ABSL_INTERNAL_SPECIAL_MEMBER_FUNCTION_ENUM("support for default construction",
+ default_constructible);
+ABSL_INTERNAL_SPECIAL_MEMBER_FUNCTION_ENUM("support for move construction",
+ move_constructible);
+ABSL_INTERNAL_SPECIAL_MEMBER_FUNCTION_ENUM("support for copy construction",
+ copy_constructible);
+ABSL_INTERNAL_SPECIAL_MEMBER_FUNCTION_ENUM("support for move assignment",
+ move_assignable);
+ABSL_INTERNAL_SPECIAL_MEMBER_FUNCTION_ENUM("support for copy assignment",
+ copy_assignable);
+ABSL_INTERNAL_SPECIAL_MEMBER_FUNCTION_ENUM("support for destruction",
+ destructible);
+
+#undef ABSL_INTERNAL_SPECIAL_MEMBER_FUNCTION_ENUM
+
+#define ABSL_INTERNAL_INTRINSIC_FUNCTION_ENUM(description, name) \
+ enum class name { maybe, yes, nothrow }; \
+ \
+ constexpr const char* PropertyName(name v) { return description; } \
+ static_assert(true, "") // Force a semicolon when using this macro.
+
+ABSL_INTERNAL_INTRINSIC_FUNCTION_ENUM("support for ==", equality_comparable);
+ABSL_INTERNAL_INTRINSIC_FUNCTION_ENUM("support for !=", inequality_comparable);
+ABSL_INTERNAL_INTRINSIC_FUNCTION_ENUM("support for <", less_than_comparable);
+ABSL_INTERNAL_INTRINSIC_FUNCTION_ENUM("support for <=", less_equal_comparable);
+ABSL_INTERNAL_INTRINSIC_FUNCTION_ENUM("support for >=",
+ greater_equal_comparable);
+ABSL_INTERNAL_INTRINSIC_FUNCTION_ENUM("support for >", greater_than_comparable);
+
+ABSL_INTERNAL_INTRINSIC_FUNCTION_ENUM("support for swap", swappable);
+
+#undef ABSL_INTERNAL_INTRINSIC_FUNCTION_ENUM
+
+enum class hashable { maybe, yes };
+
+constexpr const char* PropertyName(hashable v) {
+ return "support for std::hash";
+}
+
+template <class T>
+using AlwaysFalse = std::false_type;
+
+#define ABSL_INTERNAL_PESSIMISTIC_MODEL_OF_SPECIAL_MEMBER(name, property) \
+ template <class T> \
+ constexpr property property##_support_of() { \
+ return std::is_##property<T>::value \
+ ? std::is_nothrow_##property<T>::value \
+ ? absl::is_trivially_##property<T>::value \
+ ? property::trivial \
+ : property::nothrow \
+ : property::yes \
+ : property::maybe; \
+ } \
+ \
+ template <class T, class MinProf, class MaxProf> \
+ void ExpectModelOf##name(ConformanceErrors* errors) { \
+ (ExpectModelOfImpl)(errors, PropertiesOfT<MinProf>::property##_support, \
+ PropertiesOfT<MaxProf>::property##_support, \
+ property##_support_of<T>()); \
+ }
+
+ABSL_INTERNAL_PESSIMISTIC_MODEL_OF_SPECIAL_MEMBER(DefaultConstructible,
+ default_constructible);
+
+ABSL_INTERNAL_PESSIMISTIC_MODEL_OF_SPECIAL_MEMBER(MoveConstructible,
+ move_constructible);
+
+ABSL_INTERNAL_PESSIMISTIC_MODEL_OF_SPECIAL_MEMBER(CopyConstructible,
+ copy_constructible);
+
+ABSL_INTERNAL_PESSIMISTIC_MODEL_OF_SPECIAL_MEMBER(MoveAssignable,
+ move_assignable);
+
+ABSL_INTERNAL_PESSIMISTIC_MODEL_OF_SPECIAL_MEMBER(CopyAssignable,
+ copy_assignable);
+
+ABSL_INTERNAL_PESSIMISTIC_MODEL_OF_SPECIAL_MEMBER(Destructible, destructible);
+
+#undef ABSL_INTERNAL_PESSIMISTIC_MODEL_OF_SPECIAL_MEMBER
+
+void BoolFunction(bool) noexcept;
+
+////////////////////////////////////////////////////////////////////////////////
+//
+// A metafunction for checking if an operation exists through SFINAE.
+//
+// `T` is the type to test and Op is an alias containing the expression to test.
+template <class T, template <class...> class Op, class = void>
+struct IsOpableImpl : std::false_type {};
+
+template <class T, template <class...> class Op>
+struct IsOpableImpl<T, Op, absl::void_t<Op<T>>> : std::true_type {};
+
+template <template <class...> class Op>
+struct IsOpable {
+ template <class T>
+ using apply = typename IsOpableImpl<T, Op>::type;
+};
+//
+////////////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////////////
+//
+// A metafunction for checking if an operation exists and is also noexcept
+// through SFINAE and the noexcept operator.
+///
+// `T` is the type to test and Op is an alias containing the expression to test.
+template <class T, template <class...> class Op, class = void>
+struct IsNothrowOpableImpl : std::false_type {};
+
+template <class T, template <class...> class Op>
+struct IsNothrowOpableImpl<T, Op, absl::enable_if_t<Op<T>::value>>
+ : std::true_type {};
+
+template <template <class...> class Op>
+struct IsNothrowOpable {
+ template <class T>
+ using apply = typename IsNothrowOpableImpl<T, Op>::type;
+};
+//
+////////////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////////////
+//
+// A macro that produces the necessary function for reporting what kind of
+// support a specific comparison operation has and a function for reporting an
+// error if a given type's support for that operation does not meet the expected
+// requirements.
+#define ABSL_INTERNAL_PESSIMISTIC_MODEL_OF_COMPARISON(name, property, op) \
+ template <class T, \
+ class Result = std::integral_constant< \
+ bool, noexcept((BoolFunction)(std::declval<const T&>() op \
+ std::declval<const T&>()))>> \
+ using name = Result; \
+ \
+ template <class T> \
+ constexpr property property##_support_of() { \
+ return IsOpable<name>::apply<T>::value \
+ ? IsNothrowOpable<name>::apply<T>::value ? property::nothrow \
+ : property::yes \
+ : property::maybe; \
+ } \
+ \
+ template <class T, class MinProf, class MaxProf> \
+ void ExpectModelOf##name(ConformanceErrors* errors) { \
+ (ExpectModelOfImpl)(errors, PropertiesOfT<MinProf>::property##_support, \
+ PropertiesOfT<MaxProf>::property##_support, \
+ property##_support_of<T>()); \
+ }
+//
+////////////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////////////
+//
+// Generate the necessary support-checking and error reporting functions for
+// each of the comparison operators.
+ABSL_INTERNAL_PESSIMISTIC_MODEL_OF_COMPARISON(EqualityComparable,
+ equality_comparable, ==);
+
+ABSL_INTERNAL_PESSIMISTIC_MODEL_OF_COMPARISON(InequalityComparable,
+ inequality_comparable, !=);
+
+ABSL_INTERNAL_PESSIMISTIC_MODEL_OF_COMPARISON(LessThanComparable,
+ less_than_comparable, <);
+
+ABSL_INTERNAL_PESSIMISTIC_MODEL_OF_COMPARISON(LessEqualComparable,
+ less_equal_comparable, <=);
+
+ABSL_INTERNAL_PESSIMISTIC_MODEL_OF_COMPARISON(GreaterEqualComparable,
+ greater_equal_comparable, >=);
+
+ABSL_INTERNAL_PESSIMISTIC_MODEL_OF_COMPARISON(GreaterThanComparable,
+ greater_than_comparable, >);
+
+#undef ABSL_INTERNAL_PESSIMISTIC_MODEL_OF_COMPARISON
+//
+////////////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////////////
+//
+// The necessary support-checking and error-reporting functions for swap.
+template <class T>
+constexpr swappable swappable_support_of() {
+ return type_traits_internal::IsSwappable<T>::value
+ ? type_traits_internal::IsNothrowSwappable<T>::value
+ ? swappable::nothrow
+ : swappable::yes
+ : swappable::maybe;
+}
+
+template <class T, class MinProf, class MaxProf>
+void ExpectModelOfSwappable(ConformanceErrors* errors) {
+ (ExpectModelOfImpl)(errors, PropertiesOfT<MinProf>::swappable_support,
+ PropertiesOfT<MaxProf>::swappable_support,
+ swappable_support_of<T>());
+}
+//
+////////////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////////////
+//
+// The necessary support-checking and error-reporting functions for std::hash.
+template <class T>
+constexpr hashable hashable_support_of() {
+ return type_traits_internal::IsHashable<T>::value ? hashable::yes
+ : hashable::maybe;
+}
+
+template <class T, class MinProf, class MaxProf>
+void ExpectModelOfHashable(ConformanceErrors* errors) {
+ (ExpectModelOfImpl)(errors, PropertiesOfT<MinProf>::hashable_support,
+ PropertiesOfT<MaxProf>::hashable_support,
+ hashable_support_of<T>());
+}
+//
+////////////////////////////////////////////////////////////////////////////////
+
+template <
+ default_constructible DefaultConstructibleValue =
+ default_constructible::maybe,
+ move_constructible MoveConstructibleValue = move_constructible::maybe,
+ copy_constructible CopyConstructibleValue = copy_constructible::maybe,
+ move_assignable MoveAssignableValue = move_assignable::maybe,
+ copy_assignable CopyAssignableValue = copy_assignable::maybe,
+ destructible DestructibleValue = destructible::maybe,
+ equality_comparable EqualityComparableValue = equality_comparable::maybe,
+ inequality_comparable InequalityComparableValue =
+ inequality_comparable::maybe,
+ less_than_comparable LessThanComparableValue = less_than_comparable::maybe,
+ less_equal_comparable LessEqualComparableValue =
+ less_equal_comparable::maybe,
+ greater_equal_comparable GreaterEqualComparableValue =
+ greater_equal_comparable::maybe,
+ greater_than_comparable GreaterThanComparableValue =
+ greater_than_comparable::maybe,
+ swappable SwappableValue = swappable::maybe,
+ hashable HashableValue = hashable::maybe>
+struct ConformanceProfile {
+ using properties = ConformanceProfile;
+
+ static constexpr default_constructible
+ default_constructible_support = // NOLINT
+ DefaultConstructibleValue;
+
+ static constexpr move_constructible move_constructible_support = // NOLINT
+ MoveConstructibleValue;
+
+ static constexpr copy_constructible copy_constructible_support = // NOLINT
+ CopyConstructibleValue;
+
+ static constexpr move_assignable move_assignable_support = // NOLINT
+ MoveAssignableValue;
+
+ static constexpr copy_assignable copy_assignable_support = // NOLINT
+ CopyAssignableValue;
+
+ static constexpr destructible destructible_support = // NOLINT
+ DestructibleValue;
+
+ static constexpr equality_comparable equality_comparable_support = // NOLINT
+ EqualityComparableValue;
+
+ static constexpr inequality_comparable
+ inequality_comparable_support = // NOLINT
+ InequalityComparableValue;
+
+ static constexpr less_than_comparable
+ less_than_comparable_support = // NOLINT
+ LessThanComparableValue;
+
+ static constexpr less_equal_comparable
+ less_equal_comparable_support = // NOLINT
+ LessEqualComparableValue;
+
+ static constexpr greater_equal_comparable
+ greater_equal_comparable_support = // NOLINT
+ GreaterEqualComparableValue;
+
+ static constexpr greater_than_comparable
+ greater_than_comparable_support = // NOLINT
+ GreaterThanComparableValue;
+
+ static constexpr swappable swappable_support = SwappableValue; // NOLINT
+
+ static constexpr hashable hashable_support = HashableValue; // NOLINT
+
+ static constexpr bool is_default_constructible = // NOLINT
+ DefaultConstructibleValue != default_constructible::maybe;
+
+ static constexpr bool is_move_constructible = // NOLINT
+ MoveConstructibleValue != move_constructible::maybe;
+
+ static constexpr bool is_copy_constructible = // NOLINT
+ CopyConstructibleValue != copy_constructible::maybe;
+
+ static constexpr bool is_move_assignable = // NOLINT
+ MoveAssignableValue != move_assignable::maybe;
+
+ static constexpr bool is_copy_assignable = // NOLINT
+ CopyAssignableValue != copy_assignable::maybe;
+
+ static constexpr bool is_destructible = // NOLINT
+ DestructibleValue != destructible::maybe;
+
+ static constexpr bool is_equality_comparable = // NOLINT
+ EqualityComparableValue != equality_comparable::maybe;
+
+ static constexpr bool is_inequality_comparable = // NOLINT
+ InequalityComparableValue != inequality_comparable::maybe;
+
+ static constexpr bool is_less_than_comparable = // NOLINT
+ LessThanComparableValue != less_than_comparable::maybe;
+
+ static constexpr bool is_less_equal_comparable = // NOLINT
+ LessEqualComparableValue != less_equal_comparable::maybe;
+
+ static constexpr bool is_greater_equal_comparable = // NOLINT
+ GreaterEqualComparableValue != greater_equal_comparable::maybe;
+
+ static constexpr bool is_greater_than_comparable = // NOLINT
+ GreaterThanComparableValue != greater_than_comparable::maybe;
+
+ static constexpr bool is_swappable = // NOLINT
+ SwappableValue != swappable::maybe;
+
+ static constexpr bool is_hashable = // NOLINT
+ HashableValue != hashable::maybe;
+};
+
+////////////////////////////////////////////////////////////////////////////////
+//
+// Compliant SFINAE-friendliness is not always present on the standard library
+// implementations that we support. This helper-struct (and associated enum) is
+// used as a means to conditionally check the hashability support of a type.
+enum class CheckHashability { no, yes };
+
+template <class T, CheckHashability ShouldCheckHashability>
+struct conservative_hashable_support_of;
+
+template <class T>
+struct conservative_hashable_support_of<T, CheckHashability::no> {
+ static constexpr hashable Invoke() { return hashable::maybe; }
+};
+
+template <class T>
+struct conservative_hashable_support_of<T, CheckHashability::yes> {
+ static constexpr hashable Invoke() { return hashable_support_of<T>(); }
+};
+//
+////////////////////////////////////////////////////////////////////////////////
+
+// The ConformanceProfile that is expected based on introspection into the type
+// by way of trait checks.
+template <class T, CheckHashability ShouldCheckHashability>
+struct SyntacticConformanceProfileOf {
+ using properties = ConformanceProfile<
+ default_constructible_support_of<T>(), move_constructible_support_of<T>(),
+ copy_constructible_support_of<T>(), move_assignable_support_of<T>(),
+ copy_assignable_support_of<T>(), destructible_support_of<T>(),
+ equality_comparable_support_of<T>(),
+ inequality_comparable_support_of<T>(),
+ less_than_comparable_support_of<T>(),
+ less_equal_comparable_support_of<T>(),
+ greater_equal_comparable_support_of<T>(),
+ greater_than_comparable_support_of<T>(), swappable_support_of<T>(),
+ conservative_hashable_support_of<T, ShouldCheckHashability>::Invoke()>;
+};
+
+#define ABSL_INTERNAL_CONFORMANCE_TESTING_DATA_MEMBER_DEF_IMPL(type, name) \
+ template <default_constructible DefaultConstructibleValue, \
+ move_constructible MoveConstructibleValue, \
+ copy_constructible CopyConstructibleValue, \
+ move_assignable MoveAssignableValue, \
+ copy_assignable CopyAssignableValue, \
+ destructible DestructibleValue, \
+ equality_comparable EqualityComparableValue, \
+ inequality_comparable InequalityComparableValue, \
+ less_than_comparable LessThanComparableValue, \
+ less_equal_comparable LessEqualComparableValue, \
+ greater_equal_comparable GreaterEqualComparableValue, \
+ greater_than_comparable GreaterThanComparableValue, \
+ swappable SwappableValue, hashable HashableValue> \
+ constexpr type ConformanceProfile< \
+ DefaultConstructibleValue, MoveConstructibleValue, \
+ CopyConstructibleValue, MoveAssignableValue, CopyAssignableValue, \
+ DestructibleValue, EqualityComparableValue, InequalityComparableValue, \
+ LessThanComparableValue, LessEqualComparableValue, \
+ GreaterEqualComparableValue, GreaterThanComparableValue, SwappableValue, \
+ HashableValue>::name
+
+#define ABSL_INTERNAL_CONFORMANCE_TESTING_DATA_MEMBER_DEF(type) \
+ ABSL_INTERNAL_CONFORMANCE_TESTING_DATA_MEMBER_DEF_IMPL(type, \
+ type##_support); \
+ ABSL_INTERNAL_CONFORMANCE_TESTING_DATA_MEMBER_DEF_IMPL(bool, is_##type)
+
+ABSL_INTERNAL_CONFORMANCE_TESTING_DATA_MEMBER_DEF(default_constructible);
+ABSL_INTERNAL_CONFORMANCE_TESTING_DATA_MEMBER_DEF(move_constructible);
+ABSL_INTERNAL_CONFORMANCE_TESTING_DATA_MEMBER_DEF(copy_constructible);
+ABSL_INTERNAL_CONFORMANCE_TESTING_DATA_MEMBER_DEF(move_assignable);
+ABSL_INTERNAL_CONFORMANCE_TESTING_DATA_MEMBER_DEF(copy_assignable);
+ABSL_INTERNAL_CONFORMANCE_TESTING_DATA_MEMBER_DEF(destructible);
+ABSL_INTERNAL_CONFORMANCE_TESTING_DATA_MEMBER_DEF(equality_comparable);
+ABSL_INTERNAL_CONFORMANCE_TESTING_DATA_MEMBER_DEF(inequality_comparable);
+ABSL_INTERNAL_CONFORMANCE_TESTING_DATA_MEMBER_DEF(less_than_comparable);
+ABSL_INTERNAL_CONFORMANCE_TESTING_DATA_MEMBER_DEF(less_equal_comparable);
+ABSL_INTERNAL_CONFORMANCE_TESTING_DATA_MEMBER_DEF(greater_equal_comparable);
+ABSL_INTERNAL_CONFORMANCE_TESTING_DATA_MEMBER_DEF(greater_than_comparable);
+ABSL_INTERNAL_CONFORMANCE_TESTING_DATA_MEMBER_DEF(swappable);
+ABSL_INTERNAL_CONFORMANCE_TESTING_DATA_MEMBER_DEF(hashable);
+
+#undef ABSL_INTERNAL_CONFORMANCE_TESTING_DATA_MEMBER_DEF
+#undef ABSL_INTERNAL_CONFORMANCE_TESTING_DATA_MEMBER_DEF_IMPL
+
+// Retrieve the enum with the minimum underlying value.
+// Note: std::min is not constexpr in C++11, which is why this is necessary.
+template <class H>
+constexpr H MinEnum(H head) {
+ return head;
+}
+
+template <class H, class N, class... T>
+constexpr H MinEnum(H head, N next, T... tail) {
+ return (UnderlyingValue)(head) < (UnderlyingValue)(next)
+ ? (MinEnum)(head, tail...)
+ : (MinEnum)(next, tail...);
+}
+
+template <class... Profs>
+struct MinimalProfiles {
+ static constexpr default_constructible
+ default_constructible_support = // NOLINT
+ (MinEnum)(PropertiesOfT<Profs>::default_constructible_support...);
+
+ static constexpr move_constructible move_constructible_support = // NOLINT
+ (MinEnum)(PropertiesOfT<Profs>::move_constructible_support...);
+
+ static constexpr copy_constructible copy_constructible_support = // NOLINT
+ (MinEnum)(PropertiesOfT<Profs>::copy_constructible_support...);
+
+ static constexpr move_assignable move_assignable_support = // NOLINT
+ (MinEnum)(PropertiesOfT<Profs>::move_assignable_support...);
+
+ static constexpr copy_assignable copy_assignable_support = // NOLINT
+ (MinEnum)(PropertiesOfT<Profs>::copy_assignable_support...);
+
+ static constexpr destructible destructible_support = // NOLINT
+ (MinEnum)(PropertiesOfT<Profs>::destructible_support...);
+
+ static constexpr equality_comparable equality_comparable_support = // NOLINT
+ (MinEnum)(PropertiesOfT<Profs>::equality_comparable_support...);
+
+ static constexpr inequality_comparable
+ inequality_comparable_support = // NOLINT
+ (MinEnum)(PropertiesOfT<Profs>::inequality_comparable_support...);
+
+ static constexpr less_than_comparable
+ less_than_comparable_support = // NOLINT
+ (MinEnum)(PropertiesOfT<Profs>::less_than_comparable_support...);
+
+ static constexpr less_equal_comparable
+ less_equal_comparable_support = // NOLINT
+ (MinEnum)(PropertiesOfT<Profs>::less_equal_comparable_support...);
+
+ static constexpr greater_equal_comparable
+ greater_equal_comparable_support = // NOLINT
+ (MinEnum)(PropertiesOfT<Profs>::greater_equal_comparable_support...);
+
+ static constexpr greater_than_comparable
+ greater_than_comparable_support = // NOLINT
+ (MinEnum)(PropertiesOfT<Profs>::greater_than_comparable_support...);
+
+ static constexpr swappable swappable_support = // NOLINT
+ (MinEnum)(PropertiesOfT<Profs>::swappable_support...);
+
+ static constexpr hashable hashable_support = // NOLINT
+ (MinEnum)(PropertiesOfT<Profs>::hashable_support...);
+
+ using properties = ConformanceProfile<
+ default_constructible_support, move_constructible_support,
+ copy_constructible_support, move_assignable_support,
+ copy_assignable_support, destructible_support,
+ equality_comparable_support, inequality_comparable_support,
+ less_than_comparable_support, less_equal_comparable_support,
+ greater_equal_comparable_support, greater_than_comparable_support,
+ swappable_support, hashable_support>;
+};
+
+// Retrieve the enum with the greatest underlying value.
+// Note: std::max is not constexpr in C++11, which is why this is necessary.
+template <class H>
+constexpr H MaxEnum(H head) {
+ return head;
+}
+
+template <class H, class N, class... T>
+constexpr H MaxEnum(H head, N next, T... tail) {
+ return (UnderlyingValue)(next) < (UnderlyingValue)(head)
+ ? (MaxEnum)(head, tail...)
+ : (MaxEnum)(next, tail...);
+}
+
+template <class... Profs>
+struct CombineProfilesImpl {
+ static constexpr default_constructible
+ default_constructible_support = // NOLINT
+ (MaxEnum)(PropertiesOfT<Profs>::default_constructible_support...);
+
+ static constexpr move_constructible move_constructible_support = // NOLINT
+ (MaxEnum)(PropertiesOfT<Profs>::move_constructible_support...);
+
+ static constexpr copy_constructible copy_constructible_support = // NOLINT
+ (MaxEnum)(PropertiesOfT<Profs>::copy_constructible_support...);
+
+ static constexpr move_assignable move_assignable_support = // NOLINT
+ (MaxEnum)(PropertiesOfT<Profs>::move_assignable_support...);
+
+ static constexpr copy_assignable copy_assignable_support = // NOLINT
+ (MaxEnum)(PropertiesOfT<Profs>::copy_assignable_support...);
+
+ static constexpr destructible destructible_support = // NOLINT
+ (MaxEnum)(PropertiesOfT<Profs>::destructible_support...);
+
+ static constexpr equality_comparable equality_comparable_support = // NOLINT
+ (MaxEnum)(PropertiesOfT<Profs>::equality_comparable_support...);
+
+ static constexpr inequality_comparable
+ inequality_comparable_support = // NOLINT
+ (MaxEnum)(PropertiesOfT<Profs>::inequality_comparable_support...);
+
+ static constexpr less_than_comparable
+ less_than_comparable_support = // NOLINT
+ (MaxEnum)(PropertiesOfT<Profs>::less_than_comparable_support...);
+
+ static constexpr less_equal_comparable
+ less_equal_comparable_support = // NOLINT
+ (MaxEnum)(PropertiesOfT<Profs>::less_equal_comparable_support...);
+
+ static constexpr greater_equal_comparable
+ greater_equal_comparable_support = // NOLINT
+ (MaxEnum)(PropertiesOfT<Profs>::greater_equal_comparable_support...);
+
+ static constexpr greater_than_comparable
+ greater_than_comparable_support = // NOLINT
+ (MaxEnum)(PropertiesOfT<Profs>::greater_than_comparable_support...);
+
+ static constexpr swappable swappable_support = // NOLINT
+ (MaxEnum)(PropertiesOfT<Profs>::swappable_support...);
+
+ static constexpr hashable hashable_support = // NOLINT
+ (MaxEnum)(PropertiesOfT<Profs>::hashable_support...);
+
+ using properties = ConformanceProfile<
+ default_constructible_support, move_constructible_support,
+ copy_constructible_support, move_assignable_support,
+ copy_assignable_support, destructible_support,
+ equality_comparable_support, inequality_comparable_support,
+ less_than_comparable_support, less_equal_comparable_support,
+ greater_equal_comparable_support, greater_than_comparable_support,
+ swappable_support, hashable_support>;
+};
+
+// NOTE: We use this as opposed to a direct alias of CombineProfilesImpl so that
+// when named aliases of CombineProfiles are created (such as in
+// conformance_aliases.h), we only pay for the combination algorithm on the
+// profiles that are actually used.
+template <class... Profs>
+struct CombineProfiles {
+ using profile_alias_of = CombineProfilesImpl<Profs...>;
+};
+
+template <>
+struct CombineProfiles<> {
+ using properties = ConformanceProfile<>;
+};
+
+template <class Profile, class Tag>
+struct StrongProfileTypedef {
+ using properties = PropertiesOfT<Profile>;
+};
+
+template <class T, class /*Enabler*/ = void>
+struct IsProfileImpl : std::false_type {};
+
+template <class T>
+struct IsProfileImpl<T, absl::void_t<PropertiesOfT<T>>> : std::true_type {};
+
+template <class T>
+struct IsProfile : IsProfileImpl<T>::type {};
+
+// A tag that describes which set of properties we will check when the user
+// requires a strict match in conformance (as opposed to a loose match which
+// allows more-refined support of any given operation).
+//
+// Currently only the RegularityDomain exists and it includes all operations
+// that the conformance testing suite knows about. The intent is that if the
+// suite is expanded to support extension, such as for checking conformance of
+// concepts like Iterators or Containers, additional corresponding domains can
+// be created.
+struct RegularityDomain {};
+
+} // namespace types_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_TYPES_INTERNAL_CONFORMANCE_PROFILE_H_
diff --git a/third_party/abseil/src/absl/types/internal/conformance_testing.h b/third_party/abseil/src/absl/types/internal/conformance_testing.h
new file mode 100644
index 0000000..487b0f7
--- /dev/null
+++ b/third_party/abseil/src/absl/types/internal/conformance_testing.h
@@ -0,0 +1,1386 @@
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// conformance_testing.h
+// -----------------------------------------------------------------------------
+//
+
+#ifndef ABSL_TYPES_INTERNAL_CONFORMANCE_TESTING_H_
+#define ABSL_TYPES_INTERNAL_CONFORMANCE_TESTING_H_
+
+////////////////////////////////////////////////////////////////////////////////
+// //
+// Many templates in this file take a `T` and a `Prof` type as explicit //
+// template arguments. These are a type to be checked and a //
+// "Regularity Profile" that describes what operations that type `T` is //
+// expected to support. See "regularity_profiles.h" for more details //
+// regarding Regularity Profiles. //
+// //
+////////////////////////////////////////////////////////////////////////////////
+
+#include <cstddef>
+#include <set>
+#include <tuple>
+#include <type_traits>
+#include <utility>
+
+#include "gtest/gtest.h"
+#include "absl/meta/type_traits.h"
+#include "absl/strings/ascii.h"
+#include "absl/strings/str_cat.h"
+#include "absl/strings/string_view.h"
+#include "absl/types/internal/conformance_aliases.h"
+#include "absl/types/internal/conformance_archetype.h"
+#include "absl/types/internal/conformance_profile.h"
+#include "absl/types/internal/conformance_testing_helpers.h"
+#include "absl/types/internal/parentheses.h"
+#include "absl/types/internal/transform_args.h"
+#include "absl/utility/utility.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace types_internal {
+
+// Returns true if the compiler incorrectly greedily instantiates constexpr
+// templates in any unevaluated context.
+constexpr bool constexpr_instantiation_when_unevaluated() {
+#if defined(__apple_build_version__) // TODO(calabrese) Make more specific
+ return true;
+#elif defined(__clang__)
+ return __clang_major__ < 4;
+#elif defined(__GNUC__)
+ // TODO(calabrese) Figure out why gcc 7 fails (seems like a different bug)
+ return __GNUC__ < 5 || (__GNUC__ == 5 && __GNUC_MINOR__ < 2) || __GNUC__ >= 7;
+#else
+ return false;
+#endif
+}
+
+// Returns true if the standard library being used incorrectly produces an error
+// when instantiating the definition of a poisoned std::hash specialization.
+constexpr bool poisoned_hash_fails_instantiation() {
+#if defined(_MSC_VER) && !defined(_LIBCPP_VERSION)
+ return _MSC_VER < 1914;
+#else
+ return false;
+#endif
+}
+
+template <class Fun>
+struct GeneratorType {
+ decltype(std::declval<const Fun&>()()) operator()() const
+ noexcept(noexcept(std::declval<const Fun&>()())) {
+ return fun();
+ }
+
+ Fun fun;
+ const char* description;
+};
+
+// A "make" function for the GeneratorType template that deduces the function
+// object type.
+template <class Fun,
+ absl::enable_if_t<IsNullaryCallable<Fun>::value>** = nullptr>
+GeneratorType<Fun> Generator(Fun fun, const char* description) {
+ return GeneratorType<Fun>{absl::move(fun), description};
+}
+
+// A type that contains a set of nullary function objects that each return an
+// instance of the same type and value (though possibly different
+// representations, such as +0 and -0 or two vectors with the same elements but
+// with different capacities).
+template <class... Funs>
+struct EquivalenceClassType {
+ std::tuple<GeneratorType<Funs>...> generators;
+};
+
+// A "make" function for the EquivalenceClassType template that deduces the
+// function object types and is constrained such that a user can only pass in
+// function objects that all have the same return type.
+template <class... Funs, absl::enable_if_t<AreGeneratorsWithTheSameReturnType<
+ Funs...>::value>** = nullptr>
+EquivalenceClassType<Funs...> EquivalenceClass(GeneratorType<Funs>... funs) {
+ return {std::make_tuple(absl::move(funs)...)};
+}
+
+// A type that contains an ordered series of EquivalenceClassTypes, from
+// smallest value to largest value.
+template <class... EqClasses>
+struct OrderedEquivalenceClasses {
+ std::tuple<EqClasses...> eq_classes;
+};
+
+// An object containing the parts of a given (name, initialization expression),
+// and is capable of generating a string that describes the given.
+struct GivenDeclaration {
+ std::string outputDeclaration(std::size_t width) const {
+ const std::size_t indent_size = 2;
+ std::string result = absl::StrCat(" ", name);
+
+ if (!expression.empty()) {
+ // Indent
+ result.resize(indent_size + width, ' ');
+ absl::StrAppend(&result, " = ", expression, ";\n");
+ } else {
+ absl::StrAppend(&result, ";\n");
+ }
+
+ return result;
+ }
+
+ std::string name;
+ std::string expression;
+};
+
+// Produce a string that contains all of the givens of an error report.
+template <class... Decls>
+std::string PrepareGivenContext(const Decls&... decls) {
+ const std::size_t width = (std::max)({decls.name.size()...});
+ return absl::StrCat("Given:\n", decls.outputDeclaration(width)..., "\n");
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// Function objects that perform a check for each comparison operator //
+////////////////////////////////////////////////////////////////////////////////
+
+#define ABSL_INTERNAL_EXPECT_OP(name, op) \
+ struct Expect##name { \
+ template <class T> \
+ void operator()(absl::string_view test_name, absl::string_view context, \
+ const T& lhs, const T& rhs, absl::string_view lhs_name, \
+ absl::string_view rhs_name) const { \
+ if (!static_cast<bool>(lhs op rhs)) { \
+ errors->addTestFailure( \
+ test_name, absl::StrCat(context, \
+ "**Unexpected comparison result**\n" \
+ "\n" \
+ "Expression:\n" \
+ " ", \
+ lhs_name, " " #op " ", rhs_name, \
+ "\n" \
+ "\n" \
+ "Expected: true\n" \
+ " Actual: false")); \
+ } else { \
+ errors->addTestSuccess(test_name); \
+ } \
+ } \
+ \
+ ConformanceErrors* errors; \
+ }; \
+ \
+ struct ExpectNot##name { \
+ template <class T> \
+ void operator()(absl::string_view test_name, absl::string_view context, \
+ const T& lhs, const T& rhs, absl::string_view lhs_name, \
+ absl::string_view rhs_name) const { \
+ if (lhs op rhs) { \
+ errors->addTestFailure( \
+ test_name, absl::StrCat(context, \
+ "**Unexpected comparison result**\n" \
+ "\n" \
+ "Expression:\n" \
+ " ", \
+ lhs_name, " " #op " ", rhs_name, \
+ "\n" \
+ "\n" \
+ "Expected: false\n" \
+ " Actual: true")); \
+ } else { \
+ errors->addTestSuccess(test_name); \
+ } \
+ } \
+ \
+ ConformanceErrors* errors; \
+ }
+
+ABSL_INTERNAL_EXPECT_OP(Eq, ==);
+ABSL_INTERNAL_EXPECT_OP(Ne, !=);
+ABSL_INTERNAL_EXPECT_OP(Lt, <);
+ABSL_INTERNAL_EXPECT_OP(Le, <=);
+ABSL_INTERNAL_EXPECT_OP(Ge, >=);
+ABSL_INTERNAL_EXPECT_OP(Gt, >);
+
+#undef ABSL_INTERNAL_EXPECT_OP
+
+// A function object that verifies that two objects hash to the same value by
+// way of the std::hash specialization.
+struct ExpectSameHash {
+ template <class T>
+ void operator()(absl::string_view test_name, absl::string_view context,
+ const T& lhs, const T& rhs, absl::string_view lhs_name,
+ absl::string_view rhs_name) const {
+ if (std::hash<T>()(lhs) != std::hash<T>()(rhs)) {
+ errors->addTestFailure(
+ test_name, absl::StrCat(context,
+ "**Unexpected hash result**\n"
+ "\n"
+ "Expression:\n"
+ " std::hash<T>()(",
+ lhs_name, ") == std::hash<T>()(", rhs_name,
+ ")\n"
+ "\n"
+ "Expected: true\n"
+ " Actual: false"));
+ } else {
+ errors->addTestSuccess(test_name);
+ }
+ }
+
+ ConformanceErrors* errors;
+};
+
+// A function template that takes two objects and verifies that each comparison
+// operator behaves in a way that is consistent with equality. It has "OneWay"
+// in the name because the first argument will always be the left-hand operand
+// of the corresponding comparison operator and the second argument will
+// always be the right-hand operand. It will never switch that order.
+// At a higher level in the test suite, the one-way form is called once for each
+// of the two possible orders whenever lhs and rhs are not the same initializer.
+template <class T, class Prof>
+void ExpectOneWayEquality(ConformanceErrors* errors,
+ absl::string_view test_name,
+ absl::string_view context, const T& lhs, const T& rhs,
+ absl::string_view lhs_name,
+ absl::string_view rhs_name) {
+ If<PropertiesOfT<Prof>::is_equality_comparable>::Invoke(
+ ExpectEq{errors}, test_name, context, lhs, rhs, lhs_name, rhs_name);
+
+ If<PropertiesOfT<Prof>::is_inequality_comparable>::Invoke(
+ ExpectNotNe{errors}, test_name, context, lhs, rhs, lhs_name, rhs_name);
+
+ If<PropertiesOfT<Prof>::is_less_than_comparable>::Invoke(
+ ExpectNotLt{errors}, test_name, context, lhs, rhs, lhs_name, rhs_name);
+
+ If<PropertiesOfT<Prof>::is_less_equal_comparable>::Invoke(
+ ExpectLe{errors}, test_name, context, lhs, rhs, lhs_name, rhs_name);
+
+ If<PropertiesOfT<Prof>::is_greater_equal_comparable>::Invoke(
+ ExpectGe{errors}, test_name, context, lhs, rhs, lhs_name, rhs_name);
+
+ If<PropertiesOfT<Prof>::is_greater_than_comparable>::Invoke(
+ ExpectNotGt{errors}, test_name, context, lhs, rhs, lhs_name, rhs_name);
+
+ If<PropertiesOfT<Prof>::is_hashable>::Invoke(
+ ExpectSameHash{errors}, test_name, context, lhs, rhs, lhs_name, rhs_name);
+}
+
+// A function template that takes two objects and verifies that each comparison
+// operator behaves in a way that is consistent with equality. This function
+// differs from ExpectOneWayEquality in that this will do checks with argument
+// order reversed in addition to in-order.
+template <class T, class Prof>
+void ExpectEquality(ConformanceErrors* errors, absl::string_view test_name,
+ absl::string_view context, const T& lhs, const T& rhs,
+ absl::string_view lhs_name, absl::string_view rhs_name) {
+ (ExpectOneWayEquality<T, Prof>)(errors, test_name, context, lhs, rhs,
+ lhs_name, rhs_name);
+ (ExpectOneWayEquality<T, Prof>)(errors, test_name, context, rhs, lhs,
+ rhs_name, lhs_name);
+}
+
+// Given a generator, makes sure that a generated value and a moved-from
+// generated value are equal.
+template <class T, class Prof>
+struct ExpectMoveConstructOneGenerator {
+ template <class Fun>
+ void operator()(const Fun& generator) const {
+ const T object = generator();
+ const T moved_object = absl::move(generator()); // Force no elision.
+
+ (ExpectEquality<T, Prof>)(errors, "Move construction",
+ PrepareGivenContext(
+ GivenDeclaration{"const _T object",
+ generator.description},
+ GivenDeclaration{"const _T moved_object",
+ std::string("std::move(") +
+ generator.description +
+ ")"}),
+ object, moved_object, "object", "moved_object");
+ }
+
+ ConformanceErrors* errors;
+};
+
+// Given a generator, makes sure that a generated value and a copied-from
+// generated value are equal.
+template <class T, class Prof>
+struct ExpectCopyConstructOneGenerator {
+ template <class Fun>
+ void operator()(const Fun& generator) const {
+ const T object = generator();
+ const T copied_object = static_cast<const T&>(generator());
+
+ (ExpectEquality<T, Prof>)(errors, "Copy construction",
+ PrepareGivenContext(
+ GivenDeclaration{"const _T object",
+ generator.description},
+ GivenDeclaration{
+ "const _T copied_object",
+ std::string("static_cast<const _T&>(") +
+ generator.description + ")"}),
+ object, copied_object, "object", "copied_object");
+ }
+
+ ConformanceErrors* errors;
+};
+
+// Default-construct and do nothing before destruction.
+//
+// This is useful in exercising the codepath of default construction followed by
+// destruction, but does not explicitly test anything. An example of where this
+// might fail is a default destructor that default-initializes a scalar and a
+// destructor reads the value of that member. Sanitizers can catch this as long
+// as our test attempts to execute such a case.
+template <class T>
+struct ExpectDefaultConstructWithDestruct {
+ void operator()() const {
+ // Scoped so that destructor gets called before reporting success.
+ {
+ T object;
+ static_cast<void>(object);
+ }
+
+ errors->addTestSuccess("Default construction");
+ }
+
+ ConformanceErrors* errors;
+};
+
+// Check move-assign into a default-constructed object.
+template <class T, class Prof>
+struct ExpectDefaultConstructWithMoveAssign {
+ template <class Fun>
+ void operator()(const Fun& generator) const {
+ const T source_of_truth = generator();
+ T object;
+ object = generator();
+
+ (ExpectEquality<T, Prof>)(errors, "Move assignment",
+ PrepareGivenContext(
+ GivenDeclaration{"const _T object",
+ generator.description},
+ GivenDeclaration{"_T object", ""},
+ GivenDeclaration{"object",
+ generator.description}),
+ object, source_of_truth, "std::as_const(object)",
+ "source_of_truth");
+ }
+
+ ConformanceErrors* errors;
+};
+
+// Check copy-assign into a default-constructed object.
+template <class T, class Prof>
+struct ExpectDefaultConstructWithCopyAssign {
+ template <class Fun>
+ void operator()(const Fun& generator) const {
+ const T source_of_truth = generator();
+ T object;
+ object = static_cast<const T&>(generator());
+
+ (ExpectEquality<T, Prof>)(errors, "Copy assignment",
+ PrepareGivenContext(
+ GivenDeclaration{"const _T source_of_truth",
+ generator.description},
+ GivenDeclaration{"_T object", ""},
+ GivenDeclaration{
+ "object",
+ std::string("static_cast<const _T&>(") +
+ generator.description + ")"}),
+ object, source_of_truth, "std::as_const(object)",
+ "source_of_truth");
+ }
+
+ ConformanceErrors* errors;
+};
+
+// Perform a self move-assign.
+template <class T, class Prof>
+struct ExpectSelfMoveAssign {
+ template <class Fun>
+ void operator()(const Fun& generator) const {
+ T object = generator();
+ object = absl::move(object);
+
+ // NOTE: Self move-assign results in a valid-but-unspecified state.
+
+ (ExpectEquality<T, Prof>)(errors, "Move assignment",
+ PrepareGivenContext(
+ GivenDeclaration{"_T object",
+ generator.description},
+ GivenDeclaration{"object",
+ "std::move(object)"}),
+ object, object, "object", "object");
+ }
+
+ ConformanceErrors* errors;
+};
+
+// Perform a self copy-assign.
+template <class T, class Prof>
+struct ExpectSelfCopyAssign {
+ template <class Fun>
+ void operator()(const Fun& generator) const {
+ const T source_of_truth = generator();
+ T object = generator();
+ const T& const_object = object;
+ object = const_object;
+
+ (ExpectEquality<T, Prof>)(errors, "Copy assignment",
+ PrepareGivenContext(
+ GivenDeclaration{"const _T source_of_truth",
+ generator.description},
+ GivenDeclaration{"_T object",
+ generator.description},
+ GivenDeclaration{"object",
+ "std::as_const(object)"}),
+ const_object, source_of_truth,
+ "std::as_const(object)", "source_of_truth");
+ }
+
+ ConformanceErrors* errors;
+};
+
+// Perform a self-swap.
+template <class T, class Prof>
+struct ExpectSelfSwap {
+ template <class Fun>
+ void operator()(const Fun& generator) const {
+ const T source_of_truth = generator();
+ T object = generator();
+
+ type_traits_internal::Swap(object, object);
+
+ std::string preliminary_info = absl::StrCat(
+ PrepareGivenContext(
+ GivenDeclaration{"const _T source_of_truth", generator.description},
+ GivenDeclaration{"_T object", generator.description}),
+ "After performing a self-swap:\n"
+ " using std::swap;\n"
+ " swap(object, object);\n"
+ "\n");
+
+ (ExpectEquality<T, Prof>)(errors, "Swap", std::move(preliminary_info),
+ object, source_of_truth, "std::as_const(object)",
+ "source_of_truth");
+ }
+
+ ConformanceErrors* errors;
+};
+
+// Perform each of the single-generator checks when necessary operations are
+// supported.
+template <class T, class Prof>
+struct ExpectSelfComparison {
+ template <class Fun>
+ void operator()(const Fun& generator) const {
+ const T object = generator();
+ (ExpectOneWayEquality<T, Prof>)(errors, "Comparison",
+ PrepareGivenContext(GivenDeclaration{
+ "const _T object",
+ generator.description}),
+ object, object, "object", "object");
+ }
+
+ ConformanceErrors* errors;
+};
+
+// Perform each of the single-generator checks when necessary operations are
+// supported.
+template <class T, class Prof>
+struct ExpectConsistency {
+ template <class Fun>
+ void operator()(const Fun& generator) const {
+ If<PropertiesOfT<Prof>::is_move_constructible>::Invoke(
+ ExpectMoveConstructOneGenerator<T, Prof>{errors}, generator);
+
+ If<PropertiesOfT<Prof>::is_copy_constructible>::Invoke(
+ ExpectCopyConstructOneGenerator<T, Prof>{errors}, generator);
+
+ If<PropertiesOfT<Prof>::is_default_constructible &&
+ PropertiesOfT<Prof>::is_move_assignable>::
+ Invoke(ExpectDefaultConstructWithMoveAssign<T, Prof>{errors},
+ generator);
+
+ If<PropertiesOfT<Prof>::is_default_constructible &&
+ PropertiesOfT<Prof>::is_copy_assignable>::
+ Invoke(ExpectDefaultConstructWithCopyAssign<T, Prof>{errors},
+ generator);
+
+ If<PropertiesOfT<Prof>::is_move_assignable>::Invoke(
+ ExpectSelfMoveAssign<T, Prof>{errors}, generator);
+
+ If<PropertiesOfT<Prof>::is_copy_assignable>::Invoke(
+ ExpectSelfCopyAssign<T, Prof>{errors}, generator);
+
+ If<PropertiesOfT<Prof>::is_swappable>::Invoke(
+ ExpectSelfSwap<T, Prof>{errors}, generator);
+ }
+
+ ConformanceErrors* errors;
+};
+
+// Check move-assign with two different values.
+template <class T, class Prof>
+struct ExpectMoveAssign {
+ template <class Fun0, class Fun1>
+ void operator()(const Fun0& generator0, const Fun1& generator1) const {
+ const T source_of_truth1 = generator1();
+ T object = generator0();
+ object = generator1();
+
+ (ExpectEquality<T, Prof>)(errors, "Move assignment",
+ PrepareGivenContext(
+ GivenDeclaration{"const _T source_of_truth1",
+ generator1.description},
+ GivenDeclaration{"_T object",
+ generator0.description},
+ GivenDeclaration{"object",
+ generator1.description}),
+ object, source_of_truth1, "std::as_const(object)",
+ "source_of_truth1");
+ }
+
+ ConformanceErrors* errors;
+};
+
+// Check copy-assign with two different values.
+template <class T, class Prof>
+struct ExpectCopyAssign {
+ template <class Fun0, class Fun1>
+ void operator()(const Fun0& generator0, const Fun1& generator1) const {
+ const T source_of_truth1 = generator1();
+ T object = generator0();
+ object = static_cast<const T&>(generator1());
+
+ (ExpectEquality<T, Prof>)(errors, "Copy assignment",
+ PrepareGivenContext(
+ GivenDeclaration{"const _T source_of_truth1",
+ generator1.description},
+ GivenDeclaration{"_T object",
+ generator0.description},
+ GivenDeclaration{
+ "object",
+ std::string("static_cast<const _T&>(") +
+ generator1.description + ")"}),
+ object, source_of_truth1, "std::as_const(object)",
+ "source_of_truth1");
+ }
+
+ ConformanceErrors* errors;
+};
+
+// Check swap with two different values.
+template <class T, class Prof>
+struct ExpectSwap {
+ template <class Fun0, class Fun1>
+ void operator()(const Fun0& generator0, const Fun1& generator1) const {
+ const T source_of_truth0 = generator0();
+ const T source_of_truth1 = generator1();
+ T object0 = generator0();
+ T object1 = generator1();
+
+ type_traits_internal::Swap(object0, object1);
+
+ const std::string context =
+ PrepareGivenContext(
+ GivenDeclaration{"const _T source_of_truth0",
+ generator0.description},
+ GivenDeclaration{"const _T source_of_truth1",
+ generator1.description},
+ GivenDeclaration{"_T object0", generator0.description},
+ GivenDeclaration{"_T object1", generator1.description}) +
+ "After performing a swap:\n"
+ " using std::swap;\n"
+ " swap(object0, object1);\n"
+ "\n";
+
+ (ExpectEquality<T, Prof>)(errors, "Swap", context, object0,
+ source_of_truth1, "std::as_const(object0)",
+ "source_of_truth1");
+ (ExpectEquality<T, Prof>)(errors, "Swap", context, object1,
+ source_of_truth0, "std::as_const(object1)",
+ "source_of_truth0");
+ }
+
+ ConformanceErrors* errors;
+};
+
+// Validate that `generator0` and `generator1` produce values that are equal.
+template <class T, class Prof>
+struct ExpectEquivalenceClassComparison {
+ template <class Fun0, class Fun1>
+ void operator()(const Fun0& generator0, const Fun1& generator1) const {
+ const T object0 = generator0();
+ const T object1 = generator1();
+
+ (ExpectEquality<T, Prof>)(errors, "Comparison",
+ PrepareGivenContext(
+ GivenDeclaration{"const _T object0",
+ generator0.description},
+ GivenDeclaration{"const _T object1",
+ generator1.description}),
+ object0, object1, "object0", "object1");
+ }
+
+ ConformanceErrors* errors;
+};
+
+// Validate that all objects in the same equivalence-class have the same value.
+template <class T, class Prof>
+struct ExpectEquivalenceClassConsistency {
+ template <class Fun0, class Fun1>
+ void operator()(const Fun0& generator0, const Fun1& generator1) const {
+ If<PropertiesOfT<Prof>::is_move_assignable>::Invoke(
+ ExpectMoveAssign<T, Prof>{errors}, generator0, generator1);
+
+ If<PropertiesOfT<Prof>::is_copy_assignable>::Invoke(
+ ExpectCopyAssign<T, Prof>{errors}, generator0, generator1);
+
+ If<PropertiesOfT<Prof>::is_swappable>::Invoke(ExpectSwap<T, Prof>{errors},
+ generator0, generator1);
+ }
+
+ ConformanceErrors* errors;
+};
+
+// Given a "lesser" object and a "greater" object, perform every combination of
+// comparison operators supported for the type, expecting consistent results.
+template <class T, class Prof>
+void ExpectOrdered(ConformanceErrors* errors, absl::string_view context,
+ const T& small, const T& big, absl::string_view small_name,
+ absl::string_view big_name) {
+ const absl::string_view test_name = "Comparison";
+
+ If<PropertiesOfT<Prof>::is_equality_comparable>::Invoke(
+ ExpectNotEq{errors}, test_name, context, small, big, small_name,
+ big_name);
+ If<PropertiesOfT<Prof>::is_equality_comparable>::Invoke(
+ ExpectNotEq{errors}, test_name, context, big, small, big_name,
+ small_name);
+
+ If<PropertiesOfT<Prof>::is_inequality_comparable>::Invoke(
+ ExpectNe{errors}, test_name, context, small, big, small_name, big_name);
+ If<PropertiesOfT<Prof>::is_inequality_comparable>::Invoke(
+ ExpectNe{errors}, test_name, context, big, small, big_name, small_name);
+
+ If<PropertiesOfT<Prof>::is_less_than_comparable>::Invoke(
+ ExpectLt{errors}, test_name, context, small, big, small_name, big_name);
+ If<PropertiesOfT<Prof>::is_less_than_comparable>::Invoke(
+ ExpectNotLt{errors}, test_name, context, big, small, big_name,
+ small_name);
+
+ If<PropertiesOfT<Prof>::is_less_equal_comparable>::Invoke(
+ ExpectLe{errors}, test_name, context, small, big, small_name, big_name);
+ If<PropertiesOfT<Prof>::is_less_equal_comparable>::Invoke(
+ ExpectNotLe{errors}, test_name, context, big, small, big_name,
+ small_name);
+
+ If<PropertiesOfT<Prof>::is_greater_equal_comparable>::Invoke(
+ ExpectNotGe{errors}, test_name, context, small, big, small_name,
+ big_name);
+ If<PropertiesOfT<Prof>::is_greater_equal_comparable>::Invoke(
+ ExpectGe{errors}, test_name, context, big, small, big_name, small_name);
+
+ If<PropertiesOfT<Prof>::is_greater_than_comparable>::Invoke(
+ ExpectNotGt{errors}, test_name, context, small, big, small_name,
+ big_name);
+ If<PropertiesOfT<Prof>::is_greater_than_comparable>::Invoke(
+ ExpectGt{errors}, test_name, context, big, small, big_name, small_name);
+}
+
+// For every two elements of an equivalence class, makes sure that those two
+// elements compare equal, including checks with the same argument passed as
+// both operands.
+template <class T, class Prof>
+struct ExpectEquivalenceClassComparisons {
+ template <class... Funs>
+ void operator()(EquivalenceClassType<Funs...> eq_class) const {
+ (ForEachTupleElement)(ExpectSelfComparison<T, Prof>{errors},
+ eq_class.generators);
+
+ (ForEveryTwo)(ExpectEquivalenceClassComparison<T, Prof>{errors},
+ eq_class.generators);
+ }
+
+ ConformanceErrors* errors;
+};
+
+// For every element of an equivalence class, makes sure that the element is
+// self-consistent (in other words, if any of move/copy/swap are defined,
+// perform those operations and make such that results and operands still
+// compare equal to known values whenever it is required for that operation.
+template <class T, class Prof>
+struct ExpectEquivalenceClass {
+ template <class... Funs>
+ void operator()(EquivalenceClassType<Funs...> eq_class) const {
+ (ForEachTupleElement)(ExpectConsistency<T, Prof>{errors},
+ eq_class.generators);
+
+ (ForEveryTwo)(ExpectEquivalenceClassConsistency<T, Prof>{errors},
+ eq_class.generators);
+ }
+
+ ConformanceErrors* errors;
+};
+
+// Validate that the passed-in argument is a generator of a greater value than
+// the one produced by the "small_gen" datamember with respect to all of the
+// comparison operators that Prof requires, with both argument orders to test.
+template <class T, class Prof, class SmallGenerator>
+struct ExpectBiggerGeneratorThanComparisons {
+ template <class BigGenerator>
+ void operator()(BigGenerator big_gen) const {
+ const T small = small_gen();
+ const T big = big_gen();
+
+ (ExpectOrdered<T, Prof>)(errors,
+ PrepareGivenContext(
+ GivenDeclaration{"const _T small",
+ small_gen.description},
+ GivenDeclaration{"const _T big",
+ big_gen.description}),
+ small, big, "small", "big");
+ }
+
+ SmallGenerator small_gen;
+ ConformanceErrors* errors;
+};
+
+// Perform all of the move, copy, and swap checks on the value generated by
+// `small_gen` and the value generated by `big_gen`.
+template <class T, class Prof, class SmallGenerator>
+struct ExpectBiggerGeneratorThan {
+ template <class BigGenerator>
+ void operator()(BigGenerator big_gen) const {
+ If<PropertiesOfT<Prof>::is_move_assignable>::Invoke(
+ ExpectMoveAssign<T, Prof>{errors}, small_gen, big_gen);
+ If<PropertiesOfT<Prof>::is_move_assignable>::Invoke(
+ ExpectMoveAssign<T, Prof>{errors}, big_gen, small_gen);
+
+ If<PropertiesOfT<Prof>::is_copy_assignable>::Invoke(
+ ExpectCopyAssign<T, Prof>{errors}, small_gen, big_gen);
+ If<PropertiesOfT<Prof>::is_copy_assignable>::Invoke(
+ ExpectCopyAssign<T, Prof>{errors}, big_gen, small_gen);
+
+ If<PropertiesOfT<Prof>::is_swappable>::Invoke(ExpectSwap<T, Prof>{errors},
+ small_gen, big_gen);
+ }
+
+ SmallGenerator small_gen;
+ ConformanceErrors* errors;
+};
+
+// Validate that the result of a generator is greater than the results of all
+// generators in an equivalence class with respect to comparisons.
+template <class T, class Prof, class SmallGenerator>
+struct ExpectBiggerGeneratorThanEqClassesComparisons {
+ template <class BigEqClass>
+ void operator()(BigEqClass big_eq_class) const {
+ (ForEachTupleElement)(
+ ExpectBiggerGeneratorThanComparisons<T, Prof, SmallGenerator>{small_gen,
+ errors},
+ big_eq_class.generators);
+ }
+
+ SmallGenerator small_gen;
+ ConformanceErrors* errors;
+};
+
+// Validate that the non-comparison binary operations required by Prof are
+// correct for the result of each generator of big_eq_class and a generator of
+// the logically smaller value returned by small_gen.
+template <class T, class Prof, class SmallGenerator>
+struct ExpectBiggerGeneratorThanEqClasses {
+ template <class BigEqClass>
+ void operator()(BigEqClass big_eq_class) const {
+ (ForEachTupleElement)(
+ ExpectBiggerGeneratorThan<T, Prof, SmallGenerator>{small_gen, errors},
+ big_eq_class.generators);
+ }
+
+ SmallGenerator small_gen;
+ ConformanceErrors* errors;
+};
+
+// Validate that each equivalence class that is passed is logically less than
+// the equivalence classes that comes later on in the argument list.
+template <class T, class Prof>
+struct ExpectOrderedEquivalenceClassesComparisons {
+ template <class... BigEqClasses>
+ struct Impl {
+ // Validate that the value produced by `small_gen` is less than all of the
+ // values generated by those of the logically larger equivalence classes.
+ template <class SmallGenerator>
+ void operator()(SmallGenerator small_gen) const {
+ (ForEachTupleElement)(ExpectBiggerGeneratorThanEqClassesComparisons<
+ T, Prof, SmallGenerator>{small_gen, errors},
+ big_eq_classes);
+ }
+
+ std::tuple<BigEqClasses...> big_eq_classes;
+ ConformanceErrors* errors;
+ };
+
+ // When given no equivalence classes, no validation is necessary.
+ void operator()() const {}
+
+ template <class SmallEqClass, class... BigEqClasses>
+ void operator()(SmallEqClass small_eq_class,
+ BigEqClasses... big_eq_classes) const {
+ // For each generator in the first equivalence class, make sure that it is
+ // less than each of those in the logically greater equivalence classes.
+ (ForEachTupleElement)(
+ Impl<BigEqClasses...>{std::make_tuple(absl::move(big_eq_classes)...),
+ errors},
+ small_eq_class.generators);
+
+ // Recurse so that all equivalence class combinations are checked.
+ (*this)(absl::move(big_eq_classes)...);
+ }
+
+ ConformanceErrors* errors;
+};
+
+// Validate that the non-comparison binary operations required by Prof are
+// correct for the result of each generator of big_eq_classes and a generator of
+// the logically smaller value returned by small_gen.
+template <class T, class Prof>
+struct ExpectOrderedEquivalenceClasses {
+ template <class... BigEqClasses>
+ struct Impl {
+ template <class SmallGenerator>
+ void operator()(SmallGenerator small_gen) const {
+ (ForEachTupleElement)(
+ ExpectBiggerGeneratorThanEqClasses<T, Prof, SmallGenerator>{small_gen,
+ errors},
+ big_eq_classes);
+ }
+
+ std::tuple<BigEqClasses...> big_eq_classes;
+ ConformanceErrors* errors;
+ };
+
+ // Check that small_eq_class is logically consistent and also is logically
+ // less than all values in big_eq_classes.
+ template <class SmallEqClass, class... BigEqClasses>
+ void operator()(SmallEqClass small_eq_class,
+ BigEqClasses... big_eq_classes) const {
+ (ForEachTupleElement)(
+ Impl<BigEqClasses...>{std::make_tuple(absl::move(big_eq_classes)...),
+ errors},
+ small_eq_class.generators);
+
+ (*this)(absl::move(big_eq_classes)...);
+ }
+
+ // Terminating case of operator().
+ void operator()() const {}
+
+ ConformanceErrors* errors;
+};
+
+// Validate that a type meets the syntactic requirements of std::hash if the
+// range of profiles requires it.
+template <class T, class MinProf, class MaxProf>
+struct ExpectHashable {
+ void operator()() const {
+ ExpectModelOfHashable<T, MinProf, MaxProf>(errors);
+ }
+
+ ConformanceErrors* errors;
+};
+
+// Validate that the type `T` meets all of the requirements associated with
+// `MinProf` and without going beyond the syntactic properties of `MaxProf`.
+template <class T, class MinProf, class MaxProf>
+struct ExpectModels {
+ void operator()(ConformanceErrors* errors) const {
+ ExpectModelOfDefaultConstructible<T, MinProf, MaxProf>(errors);
+ ExpectModelOfMoveConstructible<T, MinProf, MaxProf>(errors);
+ ExpectModelOfCopyConstructible<T, MinProf, MaxProf>(errors);
+ ExpectModelOfMoveAssignable<T, MinProf, MaxProf>(errors);
+ ExpectModelOfCopyAssignable<T, MinProf, MaxProf>(errors);
+ ExpectModelOfDestructible<T, MinProf, MaxProf>(errors);
+ ExpectModelOfEqualityComparable<T, MinProf, MaxProf>(errors);
+ ExpectModelOfInequalityComparable<T, MinProf, MaxProf>(errors);
+ ExpectModelOfLessThanComparable<T, MinProf, MaxProf>(errors);
+ ExpectModelOfLessEqualComparable<T, MinProf, MaxProf>(errors);
+ ExpectModelOfGreaterEqualComparable<T, MinProf, MaxProf>(errors);
+ ExpectModelOfGreaterThanComparable<T, MinProf, MaxProf>(errors);
+ ExpectModelOfSwappable<T, MinProf, MaxProf>(errors);
+
+ // Only check hashability on compilers that have a compliant default-hash.
+ If<!poisoned_hash_fails_instantiation()>::Invoke(
+ ExpectHashable<T, MinProf, MaxProf>{errors});
+ }
+};
+
+// A metafunction that yields a Profile matching the set of properties that are
+// safe to be checked (lack-of-hashability is only checked on standard library
+// implementations that are standards compliant in that they provide a std::hash
+// primary template that is SFINAE-friendly)
+template <class LogicalProf, class T>
+struct MinimalCheckableProfile {
+ using type =
+ MinimalProfiles<PropertiesOfT<LogicalProf>,
+ PropertiesOfT<SyntacticConformanceProfileOf<
+ T, !PropertiesOfT<LogicalProf>::is_hashable &&
+ poisoned_hash_fails_instantiation()
+ ? CheckHashability::no
+ : CheckHashability::yes>>>;
+};
+
+// An identity metafunction
+template <class T>
+struct Always {
+ using type = T;
+};
+
+// Validate the T meets all of the necessary requirements of LogicalProf, with
+// syntactic requirements defined by the profile range [MinProf, MaxProf].
+template <class T, class LogicalProf, class MinProf, class MaxProf,
+ class... EqClasses>
+ConformanceErrors ExpectRegularityImpl(
+ OrderedEquivalenceClasses<EqClasses...> vals) {
+ ConformanceErrors errors((NameOf<T>()));
+
+ If<!constexpr_instantiation_when_unevaluated()>::Invoke(
+ ExpectModels<T, MinProf, MaxProf>(), &errors);
+
+ using minimal_profile = typename absl::conditional_t<
+ constexpr_instantiation_when_unevaluated(), Always<LogicalProf>,
+ MinimalCheckableProfile<LogicalProf, T>>::type;
+
+ If<PropertiesOfT<minimal_profile>::is_default_constructible>::Invoke(
+ ExpectDefaultConstructWithDestruct<T>{&errors});
+
+ //////////////////////////////////////////////////////////////////////////////
+ // Perform all comparison checks first, since later checks depend on their
+ // correctness.
+ //
+ // Check all of the comparisons for all values in the same equivalence
+ // class (equal with respect to comparison operators and hash the same).
+ (ForEachTupleElement)(
+ ExpectEquivalenceClassComparisons<T, minimal_profile>{&errors},
+ vals.eq_classes);
+
+ // Check all of the comparisons for each combination of values that are in
+ // different equivalence classes (not equal with respect to comparison
+ // operators).
+ absl::apply(
+ ExpectOrderedEquivalenceClassesComparisons<T, minimal_profile>{&errors},
+ vals.eq_classes);
+ //
+ //////////////////////////////////////////////////////////////////////////////
+
+ // Perform remaining checks, relying on comparisons.
+ // TODO(calabrese) short circuit if any comparisons above failed.
+ (ForEachTupleElement)(ExpectEquivalenceClass<T, minimal_profile>{&errors},
+ vals.eq_classes);
+
+ absl::apply(ExpectOrderedEquivalenceClasses<T, minimal_profile>{&errors},
+ vals.eq_classes);
+
+ return errors;
+}
+
+// A type that represents a range of profiles that are acceptable to be matched.
+//
+// `MinProf` is the minimum set of syntactic requirements that must be met.
+//
+// `MaxProf` is the maximum set of syntactic requirements that must be met.
+// This maximum is particularly useful for certain "strictness" checking. Some
+// examples for when this is useful:
+//
+// * Making sure that a type is move-only (rather than simply movable)
+//
+// * Making sure that a member function is *not* noexcept in cases where it
+// cannot be noexcept, such as if a dependent datamember has certain
+// operations that are not noexcept.
+//
+// * Making sure that a type tightly matches a spec, such as the standard.
+//
+// `LogicalProf` is the Profile for which run-time testing is to take place.
+//
+// Note: The reason for `LogicalProf` is because it is often the case, when
+// dealing with templates, that a declaration of a given operation is specified,
+// but whose body would fail to instantiate. Examples include the
+// copy-constructor of a standard container when the element-type is move-only,
+// or the comparison operators of a standard container when the element-type
+// does not have the necessary comparison operations defined. The `LogicalProf`
+// parameter allows us to capture the intent of what should be tested at
+// run-time, even in the cases where syntactically it might otherwise appear as
+// though the type undergoing testing supports more than it actually does.
+template <class LogicalProf, class MinProf = LogicalProf,
+ class MaxProf = MinProf>
+struct ProfileRange {
+ using logical_profile = LogicalProf;
+ using min_profile = MinProf;
+ using max_profile = MaxProf;
+};
+
+// Similar to ProfileRange except that it creates a profile range that is
+// coupled with a Domain and is used when testing that a type matches exactly
+// the "minimum" requirements of LogicalProf.
+template <class StrictnessDomain, class LogicalProf,
+ class MinProf = LogicalProf, class MaxProf = MinProf>
+struct StrictProfileRange {
+ // We do not yet support extension.
+ static_assert(
+ std::is_same<StrictnessDomain, RegularityDomain>::value,
+ "Currently, the only valid StrictnessDomain is RegularityDomain.");
+ using strictness_domain = StrictnessDomain;
+ using logical_profile = LogicalProf;
+ using min_profile = MinProf;
+ using max_profile = MaxProf;
+};
+
+////////////////////////////////////////////////////////////////////////////////
+//
+// A metafunction that creates a StrictProfileRange from a Domain and either a
+// Profile or ProfileRange.
+template <class StrictnessDomain, class ProfOrRange>
+struct MakeStrictProfileRange;
+
+template <class StrictnessDomain, class LogicalProf>
+struct MakeStrictProfileRange {
+ using type = StrictProfileRange<StrictnessDomain, LogicalProf>;
+};
+
+template <class StrictnessDomain, class LogicalProf, class MinProf,
+ class MaxProf>
+struct MakeStrictProfileRange<StrictnessDomain,
+ ProfileRange<LogicalProf, MinProf, MaxProf>> {
+ using type =
+ StrictProfileRange<StrictnessDomain, LogicalProf, MinProf, MaxProf>;
+};
+
+template <class StrictnessDomain, class ProfOrRange>
+using MakeStrictProfileRangeT =
+ typename MakeStrictProfileRange<StrictnessDomain, ProfOrRange>::type;
+//
+////////////////////////////////////////////////////////////////////////////////
+
+// A profile in the RegularityDomain with the strongest possible requirements.
+using MostStrictProfile =
+ CombineProfiles<TriviallyCompleteProfile, NothrowComparableProfile>;
+
+// Forms a ProfileRange that treats the Profile as the bare minimum requirements
+// of a type.
+template <class LogicalProf, class MinProf = LogicalProf>
+using LooseProfileRange = StrictProfileRange<RegularityDomain, LogicalProf,
+ MinProf, MostStrictProfile>;
+
+template <class Prof>
+using MakeLooseProfileRangeT = Prof;
+
+////////////////////////////////////////////////////////////////////////////////
+//
+// The following classes implement the metafunction ProfileRangeOfT<T> that
+// takes either a Profile or ProfileRange and yields the ProfileRange to be
+// used during testing.
+//
+template <class T, class /*Enabler*/ = void>
+struct ProfileRangeOfImpl;
+
+template <class T>
+struct ProfileRangeOfImpl<T, absl::void_t<PropertiesOfT<T>>> {
+ using type = LooseProfileRange<T>;
+};
+
+template <class T>
+struct ProfileRangeOf : ProfileRangeOfImpl<T> {};
+
+template <class StrictnessDomain, class LogicalProf, class MinProf,
+ class MaxProf>
+struct ProfileRangeOf<
+ StrictProfileRange<StrictnessDomain, LogicalProf, MinProf, MaxProf>> {
+ using type =
+ StrictProfileRange<StrictnessDomain, LogicalProf, MinProf, MaxProf>;
+};
+
+template <class T>
+using ProfileRangeOfT = typename ProfileRangeOf<T>::type;
+//
+////////////////////////////////////////////////////////////////////////////////
+
+// Extract the logical profile of a range (what will be runtime tested).
+template <class T>
+using LogicalProfileOfT = typename ProfileRangeOfT<T>::logical_profile;
+
+// Extract the minimal syntactic profile of a range (error if not at least).
+template <class T>
+using MinProfileOfT = typename ProfileRangeOfT<T>::min_profile;
+
+// Extract the maximum syntactic profile of a range (error if more than).
+template <class T>
+using MaxProfileOfT = typename ProfileRangeOfT<T>::max_profile;
+
+////////////////////////////////////////////////////////////////////////////////
+//
+template <class T>
+struct IsProfileOrProfileRange : IsProfile<T>::type {};
+
+template <class StrictnessDomain, class LogicalProf, class MinProf,
+ class MaxProf>
+struct IsProfileOrProfileRange<
+ StrictProfileRange<StrictnessDomain, LogicalProf, MinProf, MaxProf>>
+ : std::true_type {};
+//
+////////////////////////////////////////////////////////////////////////////////
+
+// TODO(calabrese): Consider naming the functions in this class the same as
+// the macros (defined later on) so that auto-complete leads to the correct name
+// and so that a user cannot accidentally call a function rather than the macro
+// form.
+template <bool ExpectSuccess, class T, class... EqClasses>
+struct ExpectConformanceOf {
+ // Add a value to be tested. Subsequent calls to this function on the same
+ // object must specify logically "larger" values with respect to the
+ // comparison operators of the type, if any.
+ //
+ // NOTE: This function should not be called directly. A stateless lambda is
+ // implicitly formed and passed when using the INITIALIZER macro at the bottom
+ // of this file.
+ template <class Fun,
+ absl::enable_if_t<std::is_same<
+ ResultOfGeneratorT<GeneratorType<Fun>>, T>::value>** = nullptr>
+ ABSL_MUST_USE_RESULT ExpectConformanceOf<ExpectSuccess, T, EqClasses...,
+ EquivalenceClassType<Fun>>
+ initializer(GeneratorType<Fun> fun) && {
+ return {
+ {std::tuple_cat(absl::move(ordered_vals.eq_classes),
+ std::make_tuple((EquivalenceClass)(absl::move(fun))))},
+ std::move(expected_failed_tests)};
+ }
+
+ template <class... TestNames,
+ absl::enable_if_t<!ExpectSuccess && sizeof...(EqClasses) == 0 &&
+ absl::conjunction<std::is_convertible<
+ TestNames, absl::string_view>...>::value>** =
+ nullptr>
+ ABSL_MUST_USE_RESULT ExpectConformanceOf<ExpectSuccess, T, EqClasses...>
+ due_to(TestNames&&... test_names) && {
+ (InsertEach)(&expected_failed_tests,
+ absl::AsciiStrToLower(absl::string_view(test_names))...);
+
+ return {absl::move(ordered_vals), std::move(expected_failed_tests)};
+ }
+
+ template <class... TestNames, int = 0, // MSVC disambiguator
+ absl::enable_if_t<ExpectSuccess && sizeof...(EqClasses) == 0 &&
+ absl::conjunction<std::is_convertible<
+ TestNames, absl::string_view>...>::value>** =
+ nullptr>
+ ABSL_MUST_USE_RESULT ExpectConformanceOf<ExpectSuccess, T, EqClasses...>
+ due_to(TestNames&&... test_names) && {
+ // TODO(calabrese) Instead have DUE_TO only exist via a CRTP base.
+ // This would produce better errors messages than the static_assert.
+ static_assert(!ExpectSuccess,
+ "DUE_TO cannot be called when conformance is expected -- did "
+ "you mean to use ASSERT_NONCONFORMANCE_OF?");
+ }
+
+ // Add a value to be tested. Subsequent calls to this function on the same
+ // object must specify logically "larger" values with respect to the
+ // comparison operators of the type, if any.
+ //
+ // NOTE: This function should not be called directly. A stateful lambda is
+ // implicitly formed and passed when using the INITIALIZER macro at the bottom
+ // of this file.
+ template <class Fun,
+ absl::enable_if_t<std::is_same<
+ ResultOfGeneratorT<GeneratorType<Fun>>, T>::value>** = nullptr>
+ ABSL_MUST_USE_RESULT ExpectConformanceOf<ExpectSuccess, T, EqClasses...,
+ EquivalenceClassType<Fun>>
+ dont_class_directly_stateful_initializer(GeneratorType<Fun> fun) && {
+ return {
+ {std::tuple_cat(absl::move(ordered_vals.eq_classes),
+ std::make_tuple((EquivalenceClass)(absl::move(fun))))},
+ std::move(expected_failed_tests)};
+ }
+
+ // Add a set of value to be tested, where each value is equal with respect to
+ // the comparison operators and std::hash specialization, if defined.
+ template <
+ class... Funs,
+ absl::void_t<absl::enable_if_t<std::is_same<
+ ResultOfGeneratorT<GeneratorType<Funs>>, T>::value>...>** = nullptr>
+ ABSL_MUST_USE_RESULT ExpectConformanceOf<ExpectSuccess, T, EqClasses...,
+ EquivalenceClassType<Funs...>>
+ equivalence_class(GeneratorType<Funs>... funs) && {
+ return {{std::tuple_cat(
+ absl::move(ordered_vals.eq_classes),
+ std::make_tuple((EquivalenceClass)(absl::move(funs)...)))},
+ std::move(expected_failed_tests)};
+ }
+
+ // Execute the tests for the captured set of values, strictly matching a range
+ // of expected profiles in a given domain.
+ template <
+ class ProfRange,
+ absl::enable_if_t<IsProfileOrProfileRange<ProfRange>::value>** = nullptr>
+ ABSL_MUST_USE_RESULT ::testing::AssertionResult with_strict_profile(
+ ProfRange /*profile*/) {
+ ConformanceErrors test_result =
+ (ExpectRegularityImpl<
+ T, LogicalProfileOfT<ProfRange>, MinProfileOfT<ProfRange>,
+ MaxProfileOfT<ProfRange>>)(absl::move(ordered_vals));
+
+ return ExpectSuccess ? test_result.assertionResult()
+ : test_result.expectFailedTests(expected_failed_tests);
+ }
+
+ // Execute the tests for the captured set of values, loosely matching a range
+ // of expected profiles (loose in that an interface is allowed to be more
+ // refined that a profile suggests, such as a type having a noexcept copy
+ // constructor when all that is required is that the copy constructor exists).
+ template <class Prof, absl::enable_if_t<IsProfile<Prof>::value>** = nullptr>
+ ABSL_MUST_USE_RESULT ::testing::AssertionResult with_loose_profile(
+ Prof /*profile*/) {
+ ConformanceErrors test_result =
+ (ExpectRegularityImpl<
+ T, Prof, Prof,
+ CombineProfiles<TriviallyCompleteProfile,
+ NothrowComparableProfile>>)(absl::
+ move(ordered_vals));
+
+ return ExpectSuccess ? test_result.assertionResult()
+ : test_result.expectFailedTests(expected_failed_tests);
+ }
+
+ OrderedEquivalenceClasses<EqClasses...> ordered_vals;
+ std::set<std::string> expected_failed_tests;
+};
+
+template <class T>
+using ExpectConformanceOfType = ExpectConformanceOf</*ExpectSuccess=*/true, T>;
+
+template <class T>
+using ExpectNonconformanceOfType =
+ ExpectConformanceOf</*ExpectSuccess=*/false, T>;
+
+struct EquivalenceClassMaker {
+ // TODO(calabrese) Constrain to callable
+ template <class Fun>
+ static GeneratorType<Fun> initializer(GeneratorType<Fun> fun) {
+ return fun;
+ }
+};
+
+// A top-level macro that begins the builder pattern.
+//
+// The argument here takes the datatype to be tested.
+#define ABSL_INTERNAL_ASSERT_CONFORMANCE_OF(...) \
+ GTEST_AMBIGUOUS_ELSE_BLOCKER_ \
+ if ABSL_INTERNAL_LPAREN \
+ const ::testing::AssertionResult gtest_ar = \
+ ABSL_INTERNAL_LPAREN ::absl::types_internal::ExpectConformanceOfType< \
+ __VA_ARGS__>()
+
+// Akin to ASSERT_CONFORMANCE_OF except that it expects failure and tries to
+// match text.
+#define ABSL_INTERNAL_ASSERT_NONCONFORMANCE_OF(...) \
+ GTEST_AMBIGUOUS_ELSE_BLOCKER_ \
+ if ABSL_INTERNAL_LPAREN \
+ const ::testing::AssertionResult gtest_ar = \
+ ABSL_INTERNAL_LPAREN ::absl::types_internal::ExpectNonconformanceOfType< \
+ __VA_ARGS__>()
+
+////////////////////////////////////////////////////////////////////////////////
+// NOTE: The following macros look like they are recursive, but are not (macros
+// cannot recurse). These actually refer to member functions of the same name.
+// This is done intentionally so that a user cannot accidentally invoke a
+// member function of the conformance-testing suite without going through the
+// macro.
+////////////////////////////////////////////////////////////////////////////////
+
+// Specify expected test failures as comma-separated strings.
+#define DUE_TO(...) due_to(__VA_ARGS__)
+
+// Specify a value to be tested.
+//
+// Note: Internally, this takes an expression and turns it into the return value
+// of lambda that captures no data. The expression is stringized during
+// preprocessing so that it can be used in error reports.
+#define INITIALIZER(...) \
+ initializer(::absl::types_internal::Generator( \
+ [] { return __VA_ARGS__; }, ABSL_INTERNAL_STRINGIZE(__VA_ARGS__)))
+
+// Specify a value to be tested.
+//
+// Note: Internally, this takes an expression and turns it into the return value
+// of lambda that captures data by reference. The expression is stringized
+// during preprocessing so that it can be used in error reports.
+#define STATEFUL_INITIALIZER(...) \
+ stateful_initializer(::absl::types_internal::Generator( \
+ [&] { return __VA_ARGS__; }, ABSL_INTERNAL_STRINGIZE(__VA_ARGS__)))
+
+// Used in the builder-pattern.
+//
+// Takes a series of INITIALIZER and/or STATEFUL_INITIALIZER invocations and
+// forwards them along to be tested, grouping them such that the testing suite
+// knows that they are supposed to represent the same logical value (the values
+// compare the same, hash the same, etc.).
+#define EQUIVALENCE_CLASS(...) \
+ equivalence_class(ABSL_INTERNAL_TRANSFORM_ARGS( \
+ ABSL_INTERNAL_PREPEND_EQ_MAKER, __VA_ARGS__))
+
+// An invocation of this or WITH_STRICT_PROFILE must end the builder-pattern.
+// It takes a Profile as its argument.
+//
+// This executes the tests and allows types that are "more referined" than the
+// profile specifies, but not less. For instance, if the Profile specifies
+// noexcept copy-constructiblity, the test will fail if the copy-constructor is
+// not noexcept, however, it will succeed if the copy constructor is trivial.
+//
+// This is useful for testing that a type meets some minimum set of
+// requirements.
+#define WITH_LOOSE_PROFILE(...) \
+ with_loose_profile( \
+ ::absl::types_internal::MakeLooseProfileRangeT<__VA_ARGS__>()) \
+ ABSL_INTERNAL_RPAREN ABSL_INTERNAL_RPAREN; \
+ else GTEST_FATAL_FAILURE_(gtest_ar.failure_message()) // NOLINT
+
+// An invocation of this or WITH_STRICT_PROFILE must end the builder-pattern.
+// It takes a Domain and a Profile as its arguments.
+//
+// This executes the tests and disallows types that differ at all from the
+// properties of the Profile. For instance, if the Profile specifies noexcept
+// copy-constructiblity, the test will fail if the copy constructor is trivial.
+//
+// This is useful for testing that a type does not do anything more than a
+// specification requires, such as to minimize things like Hyrum's Law, or more
+// commonly, to prevent a type from being "accidentally" copy-constructible in
+// a way that may produce incorrect results, simply because the user forget to
+// delete that operation.
+#define WITH_STRICT_PROFILE(...) \
+ with_strict_profile( \
+ ::absl::types_internal::MakeStrictProfileRangeT<__VA_ARGS__>()) \
+ ABSL_INTERNAL_RPAREN ABSL_INTERNAL_RPAREN; \
+ else GTEST_FATAL_FAILURE_(gtest_ar.failure_message()) // NOLINT
+
+// Internal macro that is used in the internals of the EDSL when forming
+// equivalence classes.
+#define ABSL_INTERNAL_PREPEND_EQ_MAKER(arg) \
+ ::absl::types_internal::EquivalenceClassMaker().arg
+
+} // namespace types_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_TYPES_INTERNAL_CONFORMANCE_TESTING_H_
diff --git a/third_party/abseil/src/absl/types/internal/conformance_testing_helpers.h b/third_party/abseil/src/absl/types/internal/conformance_testing_helpers.h
new file mode 100644
index 0000000..00775f9
--- /dev/null
+++ b/third_party/abseil/src/absl/types/internal/conformance_testing_helpers.h
@@ -0,0 +1,391 @@
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_TYPES_INTERNAL_CONFORMANCE_TESTING_HELPERS_H_
+#define ABSL_TYPES_INTERNAL_CONFORMANCE_TESTING_HELPERS_H_
+
+// Checks to determine whether or not we can use abi::__cxa_demangle
+#if (defined(__ANDROID__) || defined(ANDROID)) && !defined(OS_ANDROID)
+#define ABSL_INTERNAL_OS_ANDROID
+#endif
+
+// We support certain compilers only. See demangle.h for details.
+#if defined(OS_ANDROID) && (defined(__i386__) || defined(__x86_64__))
+#define ABSL_TYPES_INTERNAL_HAS_CXA_DEMANGLE 0
+#elif (__GNUC__ >= 4 || (__GNUC__ >= 3 && __GNUC_MINOR__ >= 4)) && \
+ !defined(__mips__)
+#define ABSL_TYPES_INTERNAL_HAS_CXA_DEMANGLE 1
+#elif defined(__clang__) && !defined(_MSC_VER)
+#define ABSL_TYPES_INTERNAL_HAS_CXA_DEMANGLE 1
+#else
+#define ABSL_TYPES_INTERNAL_HAS_CXA_DEMANGLE 0
+#endif
+
+#include <tuple>
+#include <type_traits>
+#include <utility>
+
+#include "absl/meta/type_traits.h"
+#include "absl/strings/string_view.h"
+#include "absl/utility/utility.h"
+
+#if ABSL_TYPES_INTERNAL_HAS_CXA_DEMANGLE
+#include <cxxabi.h>
+
+#include <cstdlib>
+#endif
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace types_internal {
+
+// Return a readable name for type T.
+template <class T>
+absl::string_view NameOfImpl() {
+// TODO(calabrese) Investigate using debugging:internal_demangle as a fallback.
+#if ABSL_TYPES_INTERNAL_HAS_CXA_DEMANGLE
+ int status = 0;
+ char* demangled_name = nullptr;
+
+ demangled_name =
+ abi::__cxa_demangle(typeid(T).name(), nullptr, nullptr, &status);
+
+ if (status == 0 && demangled_name != nullptr) {
+ return demangled_name;
+ } else {
+ return typeid(T).name();
+ }
+#else
+ return typeid(T).name();
+#endif
+ // NOTE: We intentionally leak demangled_name so that it remains valid
+ // throughout the remainder of the program.
+}
+
+// Given a type, returns as nice of a type name as we can produce (demangled).
+//
+// Note: This currently strips cv-qualifiers and references, but that is okay
+// because we only use this internally with unqualified object types.
+template <class T>
+std::string NameOf() {
+ static const absl::string_view result = NameOfImpl<T>();
+ return std::string(result);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+//
+// Metafunction to check if a type is callable with no explicit arguments
+template <class Fun, class /*Enabler*/ = void>
+struct IsNullaryCallableImpl : std::false_type {};
+
+template <class Fun>
+struct IsNullaryCallableImpl<
+ Fun, absl::void_t<decltype(std::declval<const Fun&>()())>>
+ : std::true_type {
+ using result_type = decltype(std::declval<const Fun&>()());
+
+ template <class ValueType>
+ using for_type = std::is_same<ValueType, result_type>;
+
+ using void_if_true = void;
+};
+
+template <class Fun>
+struct IsNullaryCallable : IsNullaryCallableImpl<Fun> {};
+//
+////////////////////////////////////////////////////////////////////////////////
+
+// A type that contains a function object that returns an instance of a type
+// that is undergoing conformance testing. This function is required to always
+// return the same value upon invocation.
+template <class Fun>
+struct GeneratorType;
+
+// A type that contains a tuple of GeneratorType<Fun> where each Fun has the
+// same return type. The result of each of the different generators should all
+// be equal values, though the underlying object representation may differ (such
+// as if one returns 0.0 and another return -0.0, or if one returns an empty
+// vector and another returns an empty vector with a different capacity.
+template <class... Funs>
+struct EquivalenceClassType;
+
+////////////////////////////////////////////////////////////////////////////////
+//
+// A metafunction to check if a type is a specialization of EquivalenceClassType
+template <class T>
+struct IsEquivalenceClass : std::false_type {};
+
+template <>
+struct IsEquivalenceClass<EquivalenceClassType<>> : std::true_type {
+ using self = IsEquivalenceClass;
+
+ // A metafunction to check if this EquivalenceClassType is a valid
+ // EquivalenceClassType for a type `ValueType` that is undergoing testing
+ template <class ValueType>
+ using for_type = std::true_type;
+};
+
+template <class Head, class... Tail>
+struct IsEquivalenceClass<EquivalenceClassType<Head, Tail...>>
+ : std::true_type {
+ using self = IsEquivalenceClass;
+
+ // The type undergoing conformance testing that this EquivalenceClass
+ // corresponds to
+ using result_type = typename IsNullaryCallable<Head>::result_type;
+
+ // A metafunction to check if this EquivalenceClassType is a valid
+ // EquivalenceClassType for a type `ValueType` that is undergoing testing
+ template <class ValueType>
+ using for_type = std::is_same<ValueType, result_type>;
+};
+//
+////////////////////////////////////////////////////////////////////////////////
+
+// A type that contains an ordered series of EquivalenceClassTypes, where the
+// the function object of each underlying GeneratorType has the same return type
+//
+// These equivalence classes are required to be in a logical ascending order
+// that is consistent with comparison operators that are defined for the return
+// type of each GeneratorType, if any.
+template <class... EqClasses>
+struct OrderedEquivalenceClasses;
+
+////////////////////////////////////////////////////////////////////////////////
+//
+// A metafunction to determine the return type of the function object contained
+// in a GeneratorType specialization.
+template <class T>
+struct ResultOfGenerator {};
+
+template <class Fun>
+struct ResultOfGenerator<GeneratorType<Fun>> {
+ using type = decltype(std::declval<const Fun&>()());
+};
+
+template <class Fun>
+using ResultOfGeneratorT = typename ResultOfGenerator<GeneratorType<Fun>>::type;
+//
+////////////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////////////
+//
+// A metafunction that yields true iff each of Funs is a GeneratorType
+// specialization and they all contain functions with the same return type
+template <class /*Enabler*/, class... Funs>
+struct AreGeneratorsWithTheSameReturnTypeImpl : std::false_type {};
+
+template <>
+struct AreGeneratorsWithTheSameReturnTypeImpl<void> : std::true_type {};
+
+template <class Head, class... Tail>
+struct AreGeneratorsWithTheSameReturnTypeImpl<
+ typename std::enable_if<absl::conjunction<std::is_same<
+ ResultOfGeneratorT<Head>, ResultOfGeneratorT<Tail>>...>::value>::type,
+ Head, Tail...> : std::true_type {};
+
+template <class... Funs>
+struct AreGeneratorsWithTheSameReturnType
+ : AreGeneratorsWithTheSameReturnTypeImpl<void, Funs...>::type {};
+//
+////////////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////////////
+//
+// A metafunction that yields true iff each of Funs is an EquivalenceClassType
+// specialization and they all contain GeneratorType specializations that have
+// the same return type
+template <class... EqClasses>
+struct AreEquivalenceClassesOfTheSameType {
+ static_assert(sizeof...(EqClasses) != sizeof...(EqClasses), "");
+};
+
+template <>
+struct AreEquivalenceClassesOfTheSameType<> : std::true_type {
+ using self = AreEquivalenceClassesOfTheSameType;
+
+ // Metafunction to check that a type is the same as all of the equivalence
+ // classes, if any.
+ // Note: In this specialization there are no equivalence classes, so the
+ // value type is always compatible.
+ template <class /*ValueType*/>
+ using for_type = std::true_type;
+};
+
+template <class... Funs>
+struct AreEquivalenceClassesOfTheSameType<EquivalenceClassType<Funs...>>
+ : std::true_type {
+ using self = AreEquivalenceClassesOfTheSameType;
+
+ // Metafunction to check that a type is the same as all of the equivalence
+ // classes, if any.
+ template <class ValueType>
+ using for_type = typename IsEquivalenceClass<
+ EquivalenceClassType<Funs...>>::template for_type<ValueType>;
+};
+
+template <class... TailEqClasses>
+struct AreEquivalenceClassesOfTheSameType<
+ EquivalenceClassType<>, EquivalenceClassType<>, TailEqClasses...>
+ : AreEquivalenceClassesOfTheSameType<TailEqClasses...>::self {};
+
+template <class HeadNextFun, class... TailNextFuns, class... TailEqClasses>
+struct AreEquivalenceClassesOfTheSameType<
+ EquivalenceClassType<>, EquivalenceClassType<HeadNextFun, TailNextFuns...>,
+ TailEqClasses...>
+ : AreEquivalenceClassesOfTheSameType<
+ EquivalenceClassType<HeadNextFun, TailNextFuns...>,
+ TailEqClasses...>::self {};
+
+template <class HeadHeadFun, class... TailHeadFuns, class... TailEqClasses>
+struct AreEquivalenceClassesOfTheSameType<
+ EquivalenceClassType<HeadHeadFun, TailHeadFuns...>, EquivalenceClassType<>,
+ TailEqClasses...>
+ : AreEquivalenceClassesOfTheSameType<
+ EquivalenceClassType<HeadHeadFun, TailHeadFuns...>,
+ TailEqClasses...>::self {};
+
+template <class HeadHeadFun, class... TailHeadFuns, class HeadNextFun,
+ class... TailNextFuns, class... TailEqClasses>
+struct AreEquivalenceClassesOfTheSameType<
+ EquivalenceClassType<HeadHeadFun, TailHeadFuns...>,
+ EquivalenceClassType<HeadNextFun, TailNextFuns...>, TailEqClasses...>
+ : absl::conditional_t<
+ IsNullaryCallable<HeadNextFun>::template for_type<
+ typename IsNullaryCallable<HeadHeadFun>::result_type>::value,
+ AreEquivalenceClassesOfTheSameType<
+ EquivalenceClassType<HeadHeadFun, TailHeadFuns...>,
+ TailEqClasses...>,
+ std::false_type> {};
+//
+////////////////////////////////////////////////////////////////////////////////
+
+// Execute a function for each passed-in parameter.
+template <class Fun, class... Cases>
+void ForEachParameter(const Fun& fun, const Cases&... cases) {
+ const std::initializer_list<bool> results = {
+ (static_cast<void>(fun(cases)), true)...};
+
+ (void)results;
+}
+
+// Execute a function on each passed-in parameter (using a bound function).
+template <class Fun>
+struct ForEachParameterFun {
+ template <class... T>
+ void operator()(const T&... cases) const {
+ (ForEachParameter)(fun, cases...);
+ }
+
+ Fun fun;
+};
+
+// Execute a function on each element of a tuple.
+template <class Fun, class Tup>
+void ForEachTupleElement(const Fun& fun, const Tup& tup) {
+ absl::apply(ForEachParameterFun<Fun>{fun}, tup);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+//
+// Execute a function for each combination of two elements of a tuple, including
+// combinations of an element with itself.
+template <class Fun, class... T>
+struct ForEveryTwoImpl {
+ template <class Lhs>
+ struct WithBoundLhs {
+ template <class Rhs>
+ void operator()(const Rhs& rhs) const {
+ fun(lhs, rhs);
+ }
+
+ Fun fun;
+ Lhs lhs;
+ };
+
+ template <class Lhs>
+ void operator()(const Lhs& lhs) const {
+ (ForEachTupleElement)(WithBoundLhs<Lhs>{fun, lhs}, args);
+ }
+
+ Fun fun;
+ std::tuple<T...> args;
+};
+
+template <class Fun, class... T>
+void ForEveryTwo(const Fun& fun, std::tuple<T...> args) {
+ (ForEachTupleElement)(ForEveryTwoImpl<Fun, T...>{fun, args}, args);
+}
+//
+////////////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////////////
+//
+// Insert all values into an associative container
+template<class Container>
+void InsertEach(Container* cont) {
+}
+
+template<class Container, class H, class... T>
+void InsertEach(Container* cont, H&& head, T&&... tail) {
+ cont->insert(head);
+ (InsertEach)(cont, tail...);
+}
+//
+////////////////////////////////////////////////////////////////////////////////
+// A template with a nested "Invoke" static-member-function that executes a
+// passed-in Callable when `Condition` is true, otherwise it ignores the
+// Callable. This is useful for executing a function object with a condition
+// that corresponds to whether or not the Callable can be safely instantiated.
+// It has some overlapping uses with C++17 `if constexpr`.
+template <bool Condition>
+struct If;
+
+template <>
+struct If</*Condition =*/false> {
+ template <class Fun, class... P>
+ static void Invoke(const Fun& /*fun*/, P&&... /*args*/) {}
+};
+
+template <>
+struct If</*Condition =*/true> {
+ template <class Fun, class... P>
+ static void Invoke(const Fun& fun, P&&... args) {
+ // TODO(calabrese) Use std::invoke equivalent instead of function-call.
+ fun(absl::forward<P>(args)...);
+ }
+};
+
+//
+// ABSL_INTERNAL_STRINGIZE(...)
+//
+// This variadic macro transforms its arguments into a c-string literal after
+// expansion.
+//
+// Example:
+//
+// ABSL_INTERNAL_STRINGIZE(std::array<int, 10>)
+//
+// Results in:
+//
+// "std::array<int, 10>"
+#define ABSL_INTERNAL_STRINGIZE(...) ABSL_INTERNAL_STRINGIZE_IMPL((__VA_ARGS__))
+#define ABSL_INTERNAL_STRINGIZE_IMPL(arg) ABSL_INTERNAL_STRINGIZE_IMPL2 arg
+#define ABSL_INTERNAL_STRINGIZE_IMPL2(...) #__VA_ARGS__
+
+} // namespace types_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_TYPES_INTERNAL_CONFORMANCE_TESTING_HELPERS_H_
diff --git a/third_party/abseil/src/absl/types/internal/conformance_testing_test.cc b/third_party/abseil/src/absl/types/internal/conformance_testing_test.cc
new file mode 100644
index 0000000..cf262fa
--- /dev/null
+++ b/third_party/abseil/src/absl/types/internal/conformance_testing_test.cc
@@ -0,0 +1,1556 @@
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/types/internal/conformance_testing.h"
+
+#include <new>
+#include <type_traits>
+#include <utility>
+
+#include "gtest/gtest.h"
+#include "absl/meta/type_traits.h"
+#include "absl/types/internal/conformance_aliases.h"
+#include "absl/types/internal/conformance_profile.h"
+
+namespace {
+
+namespace ti = absl::types_internal;
+
+template <class T>
+using DefaultConstructibleWithNewImpl = decltype(::new (std::nothrow) T);
+
+template <class T>
+using DefaultConstructibleWithNew =
+ absl::type_traits_internal::is_detected<DefaultConstructibleWithNewImpl, T>;
+
+template <class T>
+using MoveConstructibleWithNewImpl =
+ decltype(::new (std::nothrow) T(std::declval<T>()));
+
+template <class T>
+using MoveConstructibleWithNew =
+ absl::type_traits_internal::is_detected<MoveConstructibleWithNewImpl, T>;
+
+template <class T>
+using CopyConstructibleWithNewImpl =
+ decltype(::new (std::nothrow) T(std::declval<const T&>()));
+
+template <class T>
+using CopyConstructibleWithNew =
+ absl::type_traits_internal::is_detected<CopyConstructibleWithNewImpl, T>;
+
+template <class T,
+ class Result =
+ std::integral_constant<bool, noexcept(::new (std::nothrow) T)>>
+using NothrowDefaultConstructibleWithNewImpl =
+ typename std::enable_if<Result::value>::type;
+
+template <class T>
+using NothrowDefaultConstructibleWithNew =
+ absl::type_traits_internal::is_detected<
+ NothrowDefaultConstructibleWithNewImpl, T>;
+
+template <class T,
+ class Result = std::integral_constant<
+ bool, noexcept(::new (std::nothrow) T(std::declval<T>()))>>
+using NothrowMoveConstructibleWithNewImpl =
+ typename std::enable_if<Result::value>::type;
+
+template <class T>
+using NothrowMoveConstructibleWithNew =
+ absl::type_traits_internal::is_detected<NothrowMoveConstructibleWithNewImpl,
+ T>;
+
+template <class T,
+ class Result = std::integral_constant<
+ bool, noexcept(::new (std::nothrow) T(std::declval<const T&>()))>>
+using NothrowCopyConstructibleWithNewImpl =
+ typename std::enable_if<Result::value>::type;
+
+template <class T>
+using NothrowCopyConstructibleWithNew =
+ absl::type_traits_internal::is_detected<NothrowCopyConstructibleWithNewImpl,
+ T>;
+
+// NOTE: ?: is used to verify contextually-convertible to bool and not simply
+// implicit or explicit convertibility.
+#define ABSL_INTERNAL_COMPARISON_OP_EXPR(op) \
+ ((std::declval<const T&>() op std::declval<const T&>()) ? true : true)
+
+#define ABSL_INTERNAL_COMPARISON_OP_TRAIT(name, op) \
+ template <class T> \
+ using name##Impl = decltype(ABSL_INTERNAL_COMPARISON_OP_EXPR(op)); \
+ \
+ template <class T> \
+ using name = absl::type_traits_internal::is_detected<name##Impl, T>; \
+ \
+ template <class T, \
+ class Result = std::integral_constant< \
+ bool, noexcept(ABSL_INTERNAL_COMPARISON_OP_EXPR(op))>> \
+ using Nothrow##name##Impl = typename std::enable_if<Result::value>::type; \
+ \
+ template <class T> \
+ using Nothrow##name = \
+ absl::type_traits_internal::is_detected<Nothrow##name##Impl, T>
+
+ABSL_INTERNAL_COMPARISON_OP_TRAIT(EqualityComparable, ==);
+ABSL_INTERNAL_COMPARISON_OP_TRAIT(InequalityComparable, !=);
+ABSL_INTERNAL_COMPARISON_OP_TRAIT(LessThanComparable, <);
+ABSL_INTERNAL_COMPARISON_OP_TRAIT(LessEqualComparable, <=);
+ABSL_INTERNAL_COMPARISON_OP_TRAIT(GreaterEqualComparable, >=);
+ABSL_INTERNAL_COMPARISON_OP_TRAIT(GreaterThanComparable, >);
+
+#undef ABSL_INTERNAL_COMPARISON_OP_TRAIT
+
+template <class T>
+class ProfileTest : public ::testing::Test {};
+
+TYPED_TEST_SUITE_P(ProfileTest);
+
+TYPED_TEST_P(ProfileTest, HasAppropriateConstructionProperties) {
+ using profile = typename TypeParam::profile;
+ using arch = typename TypeParam::arch;
+ using expected_profile = typename TypeParam::expected_profile;
+
+ using props = ti::PropertiesOfT<profile>;
+ using arch_props = ti::PropertiesOfArchetypeT<arch>;
+ using expected_props = ti::PropertiesOfT<expected_profile>;
+
+ // Make sure all of the properties are as expected.
+ // There are seemingly redundant tests here to make it easier to diagnose
+ // the specifics of the failure if something were to go wrong.
+ EXPECT_TRUE((std::is_same<props, arch_props>::value));
+ EXPECT_TRUE((std::is_same<props, expected_props>::value));
+ EXPECT_TRUE((std::is_same<arch_props, expected_props>::value));
+
+ EXPECT_EQ(props::default_constructible_support,
+ expected_props::default_constructible_support);
+
+ EXPECT_EQ(props::move_constructible_support,
+ expected_props::move_constructible_support);
+
+ EXPECT_EQ(props::copy_constructible_support,
+ expected_props::copy_constructible_support);
+
+ EXPECT_EQ(props::destructible_support, expected_props::destructible_support);
+
+ // Avoid additional error message noise when profile and archetype match with
+ // each other but were not what was expected.
+ if (!std::is_same<props, arch_props>::value) {
+ EXPECT_EQ(arch_props::default_constructible_support,
+ expected_props::default_constructible_support);
+
+ EXPECT_EQ(arch_props::move_constructible_support,
+ expected_props::move_constructible_support);
+
+ EXPECT_EQ(arch_props::copy_constructible_support,
+ expected_props::copy_constructible_support);
+
+ EXPECT_EQ(arch_props::destructible_support,
+ expected_props::destructible_support);
+ }
+
+ //////////////////////////////////////////////////////////////////////////////
+ // Default constructor checks //
+ //////////////////////////////////////////////////////////////////////////////
+ EXPECT_EQ(props::default_constructible_support,
+ expected_props::default_constructible_support);
+
+ switch (expected_props::default_constructible_support) {
+ case ti::default_constructible::maybe:
+ EXPECT_FALSE(DefaultConstructibleWithNew<arch>::value);
+ EXPECT_FALSE(NothrowDefaultConstructibleWithNew<arch>::value);
+
+ // Standard constructible traits depend on the destructor.
+ if (std::is_destructible<arch>::value) {
+ EXPECT_FALSE(std::is_default_constructible<arch>::value);
+ EXPECT_FALSE(std::is_nothrow_default_constructible<arch>::value);
+ EXPECT_FALSE(absl::is_trivially_default_constructible<arch>::value);
+ }
+ break;
+ case ti::default_constructible::yes:
+ EXPECT_TRUE(DefaultConstructibleWithNew<arch>::value);
+ EXPECT_FALSE(NothrowDefaultConstructibleWithNew<arch>::value);
+
+ // Standard constructible traits depend on the destructor.
+ if (std::is_destructible<arch>::value) {
+ EXPECT_TRUE(std::is_default_constructible<arch>::value);
+ EXPECT_FALSE(std::is_nothrow_default_constructible<arch>::value);
+ EXPECT_FALSE(absl::is_trivially_default_constructible<arch>::value);
+ }
+ break;
+ case ti::default_constructible::nothrow:
+ EXPECT_TRUE(DefaultConstructibleWithNew<arch>::value);
+ EXPECT_TRUE(NothrowDefaultConstructibleWithNew<arch>::value);
+
+ // Standard constructible traits depend on the destructor.
+ if (std::is_destructible<arch>::value) {
+ EXPECT_TRUE(std::is_default_constructible<arch>::value);
+ EXPECT_TRUE(std::is_nothrow_default_constructible<arch>::value);
+ EXPECT_FALSE(absl::is_trivially_default_constructible<arch>::value);
+
+ // Constructor traits also check the destructor.
+ if (std::is_nothrow_destructible<arch>::value) {
+ EXPECT_TRUE(std::is_nothrow_default_constructible<arch>::value);
+ }
+ }
+ break;
+ case ti::default_constructible::trivial:
+ EXPECT_TRUE(DefaultConstructibleWithNew<arch>::value);
+ EXPECT_TRUE(NothrowDefaultConstructibleWithNew<arch>::value);
+
+ // Standard constructible traits depend on the destructor.
+ if (std::is_destructible<arch>::value) {
+ EXPECT_TRUE(std::is_default_constructible<arch>::value);
+ EXPECT_TRUE(std::is_nothrow_default_constructible<arch>::value);
+
+ // Constructor triviality traits require trivially destructible types.
+ if (absl::is_trivially_destructible<arch>::value) {
+ EXPECT_TRUE(absl::is_trivially_default_constructible<arch>::value);
+ }
+ }
+ break;
+ }
+
+ //////////////////////////////////////////////////////////////////////////////
+ // Move constructor checks //
+ //////////////////////////////////////////////////////////////////////////////
+ EXPECT_EQ(props::move_constructible_support,
+ expected_props::move_constructible_support);
+
+ switch (expected_props::move_constructible_support) {
+ case ti::move_constructible::maybe:
+ EXPECT_FALSE(MoveConstructibleWithNew<arch>::value);
+ EXPECT_FALSE(NothrowMoveConstructibleWithNew<arch>::value);
+
+ // Standard constructible traits depend on the destructor.
+ if (std::is_destructible<arch>::value) {
+ EXPECT_FALSE(std::is_move_constructible<arch>::value);
+ EXPECT_FALSE(std::is_nothrow_move_constructible<arch>::value);
+ EXPECT_FALSE(absl::is_trivially_move_constructible<arch>::value);
+ }
+ break;
+ case ti::move_constructible::yes:
+ EXPECT_TRUE(MoveConstructibleWithNew<arch>::value);
+ EXPECT_FALSE(NothrowMoveConstructibleWithNew<arch>::value);
+
+ // Standard constructible traits depend on the destructor.
+ if (std::is_destructible<arch>::value) {
+ EXPECT_TRUE(std::is_move_constructible<arch>::value);
+ EXPECT_FALSE(std::is_nothrow_move_constructible<arch>::value);
+ EXPECT_FALSE(absl::is_trivially_move_constructible<arch>::value);
+ }
+ break;
+ case ti::move_constructible::nothrow:
+ EXPECT_TRUE(MoveConstructibleWithNew<arch>::value);
+ EXPECT_TRUE(NothrowMoveConstructibleWithNew<arch>::value);
+
+ // Standard constructible traits depend on the destructor.
+ if (std::is_destructible<arch>::value) {
+ EXPECT_TRUE(std::is_move_constructible<arch>::value);
+ EXPECT_TRUE(std::is_nothrow_move_constructible<arch>::value);
+ EXPECT_FALSE(absl::is_trivially_move_constructible<arch>::value);
+
+ // Constructor traits also check the destructor.
+ if (std::is_nothrow_destructible<arch>::value) {
+ EXPECT_TRUE(std::is_nothrow_move_constructible<arch>::value);
+ }
+ }
+ break;
+ case ti::move_constructible::trivial:
+ EXPECT_TRUE(MoveConstructibleWithNew<arch>::value);
+ EXPECT_TRUE(NothrowMoveConstructibleWithNew<arch>::value);
+
+ // Standard constructible traits depend on the destructor.
+ if (std::is_destructible<arch>::value) {
+ EXPECT_TRUE(std::is_move_constructible<arch>::value);
+ EXPECT_TRUE(std::is_nothrow_move_constructible<arch>::value);
+
+ // Constructor triviality traits require trivially destructible types.
+ if (absl::is_trivially_destructible<arch>::value) {
+ EXPECT_TRUE(absl::is_trivially_move_constructible<arch>::value);
+ }
+ }
+ break;
+ }
+
+ //////////////////////////////////////////////////////////////////////////////
+ // Copy constructor checks //
+ //////////////////////////////////////////////////////////////////////////////
+ EXPECT_EQ(props::copy_constructible_support,
+ expected_props::copy_constructible_support);
+
+ switch (expected_props::copy_constructible_support) {
+ case ti::copy_constructible::maybe:
+ EXPECT_FALSE(CopyConstructibleWithNew<arch>::value);
+ EXPECT_FALSE(NothrowCopyConstructibleWithNew<arch>::value);
+
+ // Standard constructible traits depend on the destructor.
+ if (std::is_destructible<arch>::value) {
+ EXPECT_FALSE(std::is_copy_constructible<arch>::value);
+ EXPECT_FALSE(std::is_nothrow_copy_constructible<arch>::value);
+ EXPECT_FALSE(absl::is_trivially_copy_constructible<arch>::value);
+ }
+ break;
+ case ti::copy_constructible::yes:
+ EXPECT_TRUE(CopyConstructibleWithNew<arch>::value);
+ EXPECT_FALSE(NothrowCopyConstructibleWithNew<arch>::value);
+
+ // Standard constructible traits depend on the destructor.
+ if (std::is_destructible<arch>::value) {
+ EXPECT_TRUE(std::is_copy_constructible<arch>::value);
+ EXPECT_FALSE(std::is_nothrow_copy_constructible<arch>::value);
+ EXPECT_FALSE(absl::is_trivially_copy_constructible<arch>::value);
+ }
+ break;
+ case ti::copy_constructible::nothrow:
+ EXPECT_TRUE(CopyConstructibleWithNew<arch>::value);
+ EXPECT_TRUE(NothrowCopyConstructibleWithNew<arch>::value);
+
+ // Standard constructible traits depend on the destructor.
+ if (std::is_destructible<arch>::value) {
+ EXPECT_TRUE(std::is_copy_constructible<arch>::value);
+ EXPECT_TRUE(std::is_nothrow_copy_constructible<arch>::value);
+ EXPECT_FALSE(absl::is_trivially_copy_constructible<arch>::value);
+
+ // Constructor traits also check the destructor.
+ if (std::is_nothrow_destructible<arch>::value) {
+ EXPECT_TRUE(std::is_nothrow_copy_constructible<arch>::value);
+ }
+ }
+ break;
+ case ti::copy_constructible::trivial:
+ EXPECT_TRUE(CopyConstructibleWithNew<arch>::value);
+ EXPECT_TRUE(NothrowCopyConstructibleWithNew<arch>::value);
+
+ // Standard constructible traits depend on the destructor.
+ if (std::is_destructible<arch>::value) {
+ EXPECT_TRUE(std::is_copy_constructible<arch>::value);
+ EXPECT_TRUE(std::is_nothrow_copy_constructible<arch>::value);
+
+ // Constructor triviality traits require trivially destructible types.
+ if (absl::is_trivially_destructible<arch>::value) {
+ EXPECT_TRUE(absl::is_trivially_copy_constructible<arch>::value);
+ }
+ }
+ break;
+ }
+
+ //////////////////////////////////////////////////////////////////////////////
+ // Destructible checks //
+ //////////////////////////////////////////////////////////////////////////////
+ EXPECT_EQ(props::destructible_support, expected_props::destructible_support);
+
+ switch (expected_props::destructible_support) {
+ case ti::destructible::maybe:
+ EXPECT_FALSE(std::is_destructible<arch>::value);
+ EXPECT_FALSE(std::is_nothrow_destructible<arch>::value);
+ EXPECT_FALSE(absl::is_trivially_destructible<arch>::value);
+ break;
+ case ti::destructible::yes:
+ EXPECT_TRUE(std::is_destructible<arch>::value);
+ EXPECT_FALSE(std::is_nothrow_destructible<arch>::value);
+ EXPECT_FALSE(absl::is_trivially_destructible<arch>::value);
+ break;
+ case ti::destructible::nothrow:
+ EXPECT_TRUE(std::is_destructible<arch>::value);
+ EXPECT_TRUE(std::is_nothrow_destructible<arch>::value);
+ EXPECT_FALSE(absl::is_trivially_destructible<arch>::value);
+ break;
+ case ti::destructible::trivial:
+ EXPECT_TRUE(std::is_destructible<arch>::value);
+ EXPECT_TRUE(std::is_nothrow_destructible<arch>::value);
+ EXPECT_TRUE(absl::is_trivially_destructible<arch>::value);
+ break;
+ }
+}
+
+TYPED_TEST_P(ProfileTest, HasAppropriateAssignmentProperties) {
+ using profile = typename TypeParam::profile;
+ using arch = typename TypeParam::arch;
+ using expected_profile = typename TypeParam::expected_profile;
+
+ using props = ti::PropertiesOfT<profile>;
+ using arch_props = ti::PropertiesOfArchetypeT<arch>;
+ using expected_props = ti::PropertiesOfT<expected_profile>;
+
+ // Make sure all of the properties are as expected.
+ // There are seemingly redundant tests here to make it easier to diagnose
+ // the specifics of the failure if something were to go wrong.
+ EXPECT_TRUE((std::is_same<props, arch_props>::value));
+ EXPECT_TRUE((std::is_same<props, expected_props>::value));
+ EXPECT_TRUE((std::is_same<arch_props, expected_props>::value));
+
+ EXPECT_EQ(props::move_assignable_support,
+ expected_props::move_assignable_support);
+
+ EXPECT_EQ(props::copy_assignable_support,
+ expected_props::copy_assignable_support);
+
+ // Avoid additional error message noise when profile and archetype match with
+ // each other but were not what was expected.
+ if (!std::is_same<props, arch_props>::value) {
+ EXPECT_EQ(arch_props::move_assignable_support,
+ expected_props::move_assignable_support);
+
+ EXPECT_EQ(arch_props::copy_assignable_support,
+ expected_props::copy_assignable_support);
+ }
+
+ //////////////////////////////////////////////////////////////////////////////
+ // Move assignment checks //
+ //////////////////////////////////////////////////////////////////////////////
+ EXPECT_EQ(props::move_assignable_support,
+ expected_props::move_assignable_support);
+
+ switch (expected_props::move_assignable_support) {
+ case ti::move_assignable::maybe:
+ EXPECT_FALSE(std::is_move_assignable<arch>::value);
+ EXPECT_FALSE(std::is_nothrow_move_assignable<arch>::value);
+ EXPECT_FALSE(absl::is_trivially_move_assignable<arch>::value);
+ break;
+ case ti::move_assignable::yes:
+ EXPECT_TRUE(std::is_move_assignable<arch>::value);
+ EXPECT_FALSE(std::is_nothrow_move_assignable<arch>::value);
+ EXPECT_FALSE(absl::is_trivially_move_assignable<arch>::value);
+ break;
+ case ti::move_assignable::nothrow:
+ EXPECT_TRUE(std::is_move_assignable<arch>::value);
+ EXPECT_TRUE(std::is_nothrow_move_assignable<arch>::value);
+ EXPECT_FALSE(absl::is_trivially_move_assignable<arch>::value);
+ break;
+ case ti::move_assignable::trivial:
+ EXPECT_TRUE(std::is_move_assignable<arch>::value);
+ EXPECT_TRUE(std::is_nothrow_move_assignable<arch>::value);
+ EXPECT_TRUE(absl::is_trivially_move_assignable<arch>::value);
+ break;
+ }
+
+ //////////////////////////////////////////////////////////////////////////////
+ // Copy assignment checks //
+ //////////////////////////////////////////////////////////////////////////////
+ EXPECT_EQ(props::copy_assignable_support,
+ expected_props::copy_assignable_support);
+
+ switch (expected_props::copy_assignable_support) {
+ case ti::copy_assignable::maybe:
+ EXPECT_FALSE(std::is_copy_assignable<arch>::value);
+ EXPECT_FALSE(std::is_nothrow_copy_assignable<arch>::value);
+ EXPECT_FALSE(absl::is_trivially_copy_assignable<arch>::value);
+ break;
+ case ti::copy_assignable::yes:
+ EXPECT_TRUE(std::is_copy_assignable<arch>::value);
+ EXPECT_FALSE(std::is_nothrow_copy_assignable<arch>::value);
+ EXPECT_FALSE(absl::is_trivially_copy_assignable<arch>::value);
+ break;
+ case ti::copy_assignable::nothrow:
+ EXPECT_TRUE(std::is_copy_assignable<arch>::value);
+ EXPECT_TRUE(std::is_nothrow_copy_assignable<arch>::value);
+ EXPECT_FALSE(absl::is_trivially_copy_assignable<arch>::value);
+ break;
+ case ti::copy_assignable::trivial:
+ EXPECT_TRUE(std::is_copy_assignable<arch>::value);
+ EXPECT_TRUE(std::is_nothrow_copy_assignable<arch>::value);
+ EXPECT_TRUE(absl::is_trivially_copy_assignable<arch>::value);
+ break;
+ }
+}
+
+TYPED_TEST_P(ProfileTest, HasAppropriateComparisonProperties) {
+ using profile = typename TypeParam::profile;
+ using arch = typename TypeParam::arch;
+ using expected_profile = typename TypeParam::expected_profile;
+
+ using props = ti::PropertiesOfT<profile>;
+ using arch_props = ti::PropertiesOfArchetypeT<arch>;
+ using expected_props = ti::PropertiesOfT<expected_profile>;
+
+ // Make sure all of the properties are as expected.
+ // There are seemingly redundant tests here to make it easier to diagnose
+ // the specifics of the failure if something were to go wrong.
+ EXPECT_TRUE((std::is_same<props, arch_props>::value));
+ EXPECT_TRUE((std::is_same<props, expected_props>::value));
+ EXPECT_TRUE((std::is_same<arch_props, expected_props>::value));
+
+ EXPECT_EQ(props::equality_comparable_support,
+ expected_props::equality_comparable_support);
+
+ EXPECT_EQ(props::inequality_comparable_support,
+ expected_props::inequality_comparable_support);
+
+ EXPECT_EQ(props::less_than_comparable_support,
+ expected_props::less_than_comparable_support);
+
+ EXPECT_EQ(props::less_equal_comparable_support,
+ expected_props::less_equal_comparable_support);
+
+ EXPECT_EQ(props::greater_equal_comparable_support,
+ expected_props::greater_equal_comparable_support);
+
+ EXPECT_EQ(props::greater_than_comparable_support,
+ expected_props::greater_than_comparable_support);
+
+ // Avoid additional error message noise when profile and archetype match with
+ // each other but were not what was expected.
+ if (!std::is_same<props, arch_props>::value) {
+ EXPECT_EQ(arch_props::equality_comparable_support,
+ expected_props::equality_comparable_support);
+
+ EXPECT_EQ(arch_props::inequality_comparable_support,
+ expected_props::inequality_comparable_support);
+
+ EXPECT_EQ(arch_props::less_than_comparable_support,
+ expected_props::less_than_comparable_support);
+
+ EXPECT_EQ(arch_props::less_equal_comparable_support,
+ expected_props::less_equal_comparable_support);
+
+ EXPECT_EQ(arch_props::greater_equal_comparable_support,
+ expected_props::greater_equal_comparable_support);
+
+ EXPECT_EQ(arch_props::greater_than_comparable_support,
+ expected_props::greater_than_comparable_support);
+ }
+
+ //////////////////////////////////////////////////////////////////////////////
+ // Equality comparable checks //
+ //////////////////////////////////////////////////////////////////////////////
+ switch (expected_props::equality_comparable_support) {
+ case ti::equality_comparable::maybe:
+ EXPECT_FALSE(EqualityComparable<arch>::value);
+ EXPECT_FALSE(NothrowEqualityComparable<arch>::value);
+ break;
+ case ti::equality_comparable::yes:
+ EXPECT_TRUE(EqualityComparable<arch>::value);
+ EXPECT_FALSE(NothrowEqualityComparable<arch>::value);
+ break;
+ case ti::equality_comparable::nothrow:
+ EXPECT_TRUE(EqualityComparable<arch>::value);
+ EXPECT_TRUE(NothrowEqualityComparable<arch>::value);
+ break;
+ }
+
+ //////////////////////////////////////////////////////////////////////////////
+ // Inequality comparable checks //
+ //////////////////////////////////////////////////////////////////////////////
+ switch (expected_props::inequality_comparable_support) {
+ case ti::inequality_comparable::maybe:
+ EXPECT_FALSE(InequalityComparable<arch>::value);
+ EXPECT_FALSE(NothrowInequalityComparable<arch>::value);
+ break;
+ case ti::inequality_comparable::yes:
+ EXPECT_TRUE(InequalityComparable<arch>::value);
+ EXPECT_FALSE(NothrowInequalityComparable<arch>::value);
+ break;
+ case ti::inequality_comparable::nothrow:
+ EXPECT_TRUE(InequalityComparable<arch>::value);
+ EXPECT_TRUE(NothrowInequalityComparable<arch>::value);
+ break;
+ }
+
+ //////////////////////////////////////////////////////////////////////////////
+ // Less than comparable checks //
+ //////////////////////////////////////////////////////////////////////////////
+ switch (expected_props::less_than_comparable_support) {
+ case ti::less_than_comparable::maybe:
+ EXPECT_FALSE(LessThanComparable<arch>::value);
+ EXPECT_FALSE(NothrowLessThanComparable<arch>::value);
+ break;
+ case ti::less_than_comparable::yes:
+ EXPECT_TRUE(LessThanComparable<arch>::value);
+ EXPECT_FALSE(NothrowLessThanComparable<arch>::value);
+ break;
+ case ti::less_than_comparable::nothrow:
+ EXPECT_TRUE(LessThanComparable<arch>::value);
+ EXPECT_TRUE(NothrowLessThanComparable<arch>::value);
+ break;
+ }
+
+ //////////////////////////////////////////////////////////////////////////////
+ // Less equal comparable checks //
+ //////////////////////////////////////////////////////////////////////////////
+ switch (expected_props::less_equal_comparable_support) {
+ case ti::less_equal_comparable::maybe:
+ EXPECT_FALSE(LessEqualComparable<arch>::value);
+ EXPECT_FALSE(NothrowLessEqualComparable<arch>::value);
+ break;
+ case ti::less_equal_comparable::yes:
+ EXPECT_TRUE(LessEqualComparable<arch>::value);
+ EXPECT_FALSE(NothrowLessEqualComparable<arch>::value);
+ break;
+ case ti::less_equal_comparable::nothrow:
+ EXPECT_TRUE(LessEqualComparable<arch>::value);
+ EXPECT_TRUE(NothrowLessEqualComparable<arch>::value);
+ break;
+ }
+
+ //////////////////////////////////////////////////////////////////////////////
+ // Greater equal comparable checks //
+ //////////////////////////////////////////////////////////////////////////////
+ switch (expected_props::greater_equal_comparable_support) {
+ case ti::greater_equal_comparable::maybe:
+ EXPECT_FALSE(GreaterEqualComparable<arch>::value);
+ EXPECT_FALSE(NothrowGreaterEqualComparable<arch>::value);
+ break;
+ case ti::greater_equal_comparable::yes:
+ EXPECT_TRUE(GreaterEqualComparable<arch>::value);
+ EXPECT_FALSE(NothrowGreaterEqualComparable<arch>::value);
+ break;
+ case ti::greater_equal_comparable::nothrow:
+ EXPECT_TRUE(GreaterEqualComparable<arch>::value);
+ EXPECT_TRUE(NothrowGreaterEqualComparable<arch>::value);
+ break;
+ }
+
+ //////////////////////////////////////////////////////////////////////////////
+ // Greater than comparable checks //
+ //////////////////////////////////////////////////////////////////////////////
+ switch (expected_props::greater_than_comparable_support) {
+ case ti::greater_than_comparable::maybe:
+ EXPECT_FALSE(GreaterThanComparable<arch>::value);
+ EXPECT_FALSE(NothrowGreaterThanComparable<arch>::value);
+ break;
+ case ti::greater_than_comparable::yes:
+ EXPECT_TRUE(GreaterThanComparable<arch>::value);
+ EXPECT_FALSE(NothrowGreaterThanComparable<arch>::value);
+ break;
+ case ti::greater_than_comparable::nothrow:
+ EXPECT_TRUE(GreaterThanComparable<arch>::value);
+ EXPECT_TRUE(NothrowGreaterThanComparable<arch>::value);
+ break;
+ }
+}
+
+TYPED_TEST_P(ProfileTest, HasAppropriateAuxilliaryProperties) {
+ using profile = typename TypeParam::profile;
+ using arch = typename TypeParam::arch;
+ using expected_profile = typename TypeParam::expected_profile;
+
+ using props = ti::PropertiesOfT<profile>;
+ using arch_props = ti::PropertiesOfArchetypeT<arch>;
+ using expected_props = ti::PropertiesOfT<expected_profile>;
+
+ // Make sure all of the properties are as expected.
+ // There are seemingly redundant tests here to make it easier to diagnose
+ // the specifics of the failure if something were to go wrong.
+ EXPECT_TRUE((std::is_same<props, arch_props>::value));
+ EXPECT_TRUE((std::is_same<props, expected_props>::value));
+ EXPECT_TRUE((std::is_same<arch_props, expected_props>::value));
+
+ EXPECT_EQ(props::swappable_support, expected_props::swappable_support);
+
+ EXPECT_EQ(props::hashable_support, expected_props::hashable_support);
+
+ // Avoid additional error message noise when profile and archetype match with
+ // each other but were not what was expected.
+ if (!std::is_same<props, arch_props>::value) {
+ EXPECT_EQ(arch_props::swappable_support, expected_props::swappable_support);
+
+ EXPECT_EQ(arch_props::hashable_support, expected_props::hashable_support);
+ }
+
+ //////////////////////////////////////////////////////////////////////////////
+ // Swappable checks //
+ //////////////////////////////////////////////////////////////////////////////
+ switch (expected_props::swappable_support) {
+ case ti::swappable::maybe:
+ EXPECT_FALSE(absl::type_traits_internal::IsSwappable<arch>::value);
+ EXPECT_FALSE(absl::type_traits_internal::IsNothrowSwappable<arch>::value);
+ break;
+ case ti::swappable::yes:
+ EXPECT_TRUE(absl::type_traits_internal::IsSwappable<arch>::value);
+ EXPECT_FALSE(absl::type_traits_internal::IsNothrowSwappable<arch>::value);
+ break;
+ case ti::swappable::nothrow:
+ EXPECT_TRUE(absl::type_traits_internal::IsSwappable<arch>::value);
+ EXPECT_TRUE(absl::type_traits_internal::IsNothrowSwappable<arch>::value);
+ break;
+ }
+
+ //////////////////////////////////////////////////////////////////////////////
+ // Hashable checks //
+ //////////////////////////////////////////////////////////////////////////////
+ switch (expected_props::hashable_support) {
+ case ti::hashable::maybe:
+#if ABSL_META_INTERNAL_STD_HASH_SFINAE_FRIENDLY_
+ EXPECT_FALSE(absl::type_traits_internal::IsHashable<arch>::value);
+#endif // ABSL_META_INTERNAL_STD_HASH_SFINAE_FRIENDLY_
+ break;
+ case ti::hashable::yes:
+ EXPECT_TRUE(absl::type_traits_internal::IsHashable<arch>::value);
+ break;
+ }
+}
+
+REGISTER_TYPED_TEST_SUITE_P(ProfileTest, HasAppropriateConstructionProperties,
+ HasAppropriateAssignmentProperties,
+ HasAppropriateComparisonProperties,
+ HasAppropriateAuxilliaryProperties);
+
+template <class Profile, class Arch, class ExpectedProfile>
+struct ProfileAndExpectation {
+ using profile = Profile;
+ using arch = Arch;
+ using expected_profile = ExpectedProfile;
+};
+
+using CoreProfilesToTest = ::testing::Types<
+ // The terminating case of combine (all properties are "maybe").
+ ProfileAndExpectation<ti::CombineProfiles<>,
+ ti::Archetype<ti::CombineProfiles<>>,
+ ti::ConformanceProfile<>>,
+
+ // Core default constructor profiles
+ ProfileAndExpectation<
+ ti::HasDefaultConstructorProfile, ti::HasDefaultConstructorArchetype,
+ ti::ConformanceProfile<ti::default_constructible::yes>>,
+ ProfileAndExpectation<
+ ti::HasNothrowDefaultConstructorProfile,
+ ti::HasNothrowDefaultConstructorArchetype,
+ ti::ConformanceProfile<ti::default_constructible::nothrow>>,
+ ProfileAndExpectation<
+ ti::HasTrivialDefaultConstructorProfile,
+ ti::HasTrivialDefaultConstructorArchetype,
+ ti::ConformanceProfile<ti::default_constructible::trivial>>,
+
+ // Core move constructor profiles
+ ProfileAndExpectation<
+ ti::HasMoveConstructorProfile, ti::HasMoveConstructorArchetype,
+ ti::ConformanceProfile<ti::default_constructible::maybe,
+ ti::move_constructible::yes>>,
+ ProfileAndExpectation<
+ ti::HasNothrowMoveConstructorProfile,
+ ti::HasNothrowMoveConstructorArchetype,
+ ti::ConformanceProfile<ti::default_constructible::maybe,
+ ti::move_constructible::nothrow>>,
+ ProfileAndExpectation<
+ ti::HasTrivialMoveConstructorProfile,
+ ti::HasTrivialMoveConstructorArchetype,
+ ti::ConformanceProfile<ti::default_constructible::maybe,
+ ti::move_constructible::trivial>>,
+
+ // Core copy constructor profiles
+ ProfileAndExpectation<
+ ti::HasCopyConstructorProfile, ti::HasCopyConstructorArchetype,
+ ti::ConformanceProfile<ti::default_constructible::maybe,
+ ti::move_constructible::maybe,
+ ti::copy_constructible::yes>>,
+ ProfileAndExpectation<
+ ti::HasNothrowCopyConstructorProfile,
+ ti::HasNothrowCopyConstructorArchetype,
+ ti::ConformanceProfile<ti::default_constructible::maybe,
+ ti::move_constructible::maybe,
+ ti::copy_constructible::nothrow>>,
+ ProfileAndExpectation<
+ ti::HasTrivialCopyConstructorProfile,
+ ti::HasTrivialCopyConstructorArchetype,
+ ti::ConformanceProfile<ti::default_constructible::maybe,
+ ti::move_constructible::maybe,
+ ti::copy_constructible::trivial>>,
+
+ // Core move assignment profiles
+ ProfileAndExpectation<
+ ti::HasMoveAssignProfile, ti::HasMoveAssignArchetype,
+ ti::ConformanceProfile<
+ ti::default_constructible::maybe, ti::move_constructible::maybe,
+ ti::copy_constructible::maybe, ti::move_assignable::yes>>,
+ ProfileAndExpectation<
+ ti::HasNothrowMoveAssignProfile, ti::HasNothrowMoveAssignArchetype,
+ ti::ConformanceProfile<
+ ti::default_constructible::maybe, ti::move_constructible::maybe,
+ ti::copy_constructible::maybe, ti::move_assignable::nothrow>>,
+ ProfileAndExpectation<
+ ti::HasTrivialMoveAssignProfile, ti::HasTrivialMoveAssignArchetype,
+ ti::ConformanceProfile<
+ ti::default_constructible::maybe, ti::move_constructible::maybe,
+ ti::copy_constructible::maybe, ti::move_assignable::trivial>>,
+
+ // Core copy assignment profiles
+ ProfileAndExpectation<
+ ti::HasCopyAssignProfile, ti::HasCopyAssignArchetype,
+ ti::ConformanceProfile<
+ ti::default_constructible::maybe, ti::move_constructible::maybe,
+ ti::copy_constructible::maybe, ti::move_assignable::maybe,
+ ti::copy_assignable::yes>>,
+ ProfileAndExpectation<
+ ti::HasNothrowCopyAssignProfile, ti::HasNothrowCopyAssignArchetype,
+ ti::ConformanceProfile<
+ ti::default_constructible::maybe, ti::move_constructible::maybe,
+ ti::copy_constructible::maybe, ti::move_assignable::maybe,
+ ti::copy_assignable::nothrow>>,
+ ProfileAndExpectation<
+ ti::HasTrivialCopyAssignProfile, ti::HasTrivialCopyAssignArchetype,
+ ti::ConformanceProfile<
+ ti::default_constructible::maybe, ti::move_constructible::maybe,
+ ti::copy_constructible::maybe, ti::move_assignable::maybe,
+ ti::copy_assignable::trivial>>,
+
+ // Core destructor profiles
+ ProfileAndExpectation<
+ ti::HasDestructorProfile, ti::HasDestructorArchetype,
+ ti::ConformanceProfile<
+ ti::default_constructible::maybe, ti::move_constructible::maybe,
+ ti::copy_constructible::maybe, ti::move_assignable::maybe,
+ ti::copy_assignable::maybe, ti::destructible::yes>>,
+ ProfileAndExpectation<
+ ti::HasNothrowDestructorProfile, ti::HasNothrowDestructorArchetype,
+ ti::ConformanceProfile<
+ ti::default_constructible::maybe, ti::move_constructible::maybe,
+ ti::copy_constructible::maybe, ti::move_assignable::maybe,
+ ti::copy_assignable::maybe, ti::destructible::nothrow>>,
+ ProfileAndExpectation<
+ ti::HasTrivialDestructorProfile, ti::HasTrivialDestructorArchetype,
+ ti::ConformanceProfile<
+ ti::default_constructible::maybe, ti::move_constructible::maybe,
+ ti::copy_constructible::maybe, ti::move_assignable::maybe,
+ ti::copy_assignable::maybe, ti::destructible::trivial>>,
+
+ // Core equality comparable profiles
+ ProfileAndExpectation<
+ ti::HasEqualityProfile, ti::HasEqualityArchetype,
+ ti::ConformanceProfile<
+ ti::default_constructible::maybe, ti::move_constructible::maybe,
+ ti::copy_constructible::maybe, ti::move_assignable::maybe,
+ ti::copy_assignable::maybe, ti::destructible::maybe,
+ ti::equality_comparable::yes>>,
+ ProfileAndExpectation<
+ ti::HasNothrowEqualityProfile, ti::HasNothrowEqualityArchetype,
+ ti::ConformanceProfile<
+ ti::default_constructible::maybe, ti::move_constructible::maybe,
+ ti::copy_constructible::maybe, ti::move_assignable::maybe,
+ ti::copy_assignable::maybe, ti::destructible::maybe,
+ ti::equality_comparable::nothrow>>,
+
+ // Core inequality comparable profiles
+ ProfileAndExpectation<
+ ti::HasInequalityProfile, ti::HasInequalityArchetype,
+ ti::ConformanceProfile<
+ ti::default_constructible::maybe, ti::move_constructible::maybe,
+ ti::copy_constructible::maybe, ti::move_assignable::maybe,
+ ti::copy_assignable::maybe, ti::destructible::maybe,
+ ti::equality_comparable::maybe, ti::inequality_comparable::yes>>,
+ ProfileAndExpectation<
+ ti::HasNothrowInequalityProfile, ti::HasNothrowInequalityArchetype,
+ ti::ConformanceProfile<
+ ti::default_constructible::maybe, ti::move_constructible::maybe,
+ ti::copy_constructible::maybe, ti::move_assignable::maybe,
+ ti::copy_assignable::maybe, ti::destructible::maybe,
+ ti::equality_comparable::maybe,
+ ti::inequality_comparable::nothrow>>,
+
+ // Core less than comparable profiles
+ ProfileAndExpectation<
+ ti::HasLessThanProfile, ti::HasLessThanArchetype,
+ ti::ConformanceProfile<
+ ti::default_constructible::maybe, ti::move_constructible::maybe,
+ ti::copy_constructible::maybe, ti::move_assignable::maybe,
+ ti::copy_assignable::maybe, ti::destructible::maybe,
+ ti::equality_comparable::maybe, ti::inequality_comparable::maybe,
+ ti::less_than_comparable::yes>>,
+ ProfileAndExpectation<
+ ti::HasNothrowLessThanProfile, ti::HasNothrowLessThanArchetype,
+ ti::ConformanceProfile<
+ ti::default_constructible::maybe, ti::move_constructible::maybe,
+ ti::copy_constructible::maybe, ti::move_assignable::maybe,
+ ti::copy_assignable::maybe, ti::destructible::maybe,
+ ti::equality_comparable::maybe, ti::inequality_comparable::maybe,
+ ti::less_than_comparable::nothrow>>,
+
+ // Core less equal comparable profiles
+ ProfileAndExpectation<
+ ti::HasLessEqualProfile, ti::HasLessEqualArchetype,
+ ti::ConformanceProfile<
+ ti::default_constructible::maybe, ti::move_constructible::maybe,
+ ti::copy_constructible::maybe, ti::move_assignable::maybe,
+ ti::copy_assignable::maybe, ti::destructible::maybe,
+ ti::equality_comparable::maybe, ti::inequality_comparable::maybe,
+ ti::less_than_comparable::maybe, ti::less_equal_comparable::yes>>,
+ ProfileAndExpectation<
+ ti::HasNothrowLessEqualProfile, ti::HasNothrowLessEqualArchetype,
+ ti::ConformanceProfile<
+ ti::default_constructible::maybe, ti::move_constructible::maybe,
+ ti::copy_constructible::maybe, ti::move_assignable::maybe,
+ ti::copy_assignable::maybe, ti::destructible::maybe,
+ ti::equality_comparable::maybe, ti::inequality_comparable::maybe,
+ ti::less_than_comparable::maybe,
+ ti::less_equal_comparable::nothrow>>,
+
+ // Core greater equal comparable profiles
+ ProfileAndExpectation<
+ ti::HasGreaterEqualProfile, ti::HasGreaterEqualArchetype,
+ ti::ConformanceProfile<
+ ti::default_constructible::maybe, ti::move_constructible::maybe,
+ ti::copy_constructible::maybe, ti::move_assignable::maybe,
+ ti::copy_assignable::maybe, ti::destructible::maybe,
+ ti::equality_comparable::maybe, ti::inequality_comparable::maybe,
+ ti::less_than_comparable::maybe, ti::less_equal_comparable::maybe,
+ ti::greater_equal_comparable::yes>>,
+ ProfileAndExpectation<
+ ti::HasNothrowGreaterEqualProfile, ti::HasNothrowGreaterEqualArchetype,
+ ti::ConformanceProfile<
+ ti::default_constructible::maybe, ti::move_constructible::maybe,
+ ti::copy_constructible::maybe, ti::move_assignable::maybe,
+ ti::copy_assignable::maybe, ti::destructible::maybe,
+ ti::equality_comparable::maybe, ti::inequality_comparable::maybe,
+ ti::less_than_comparable::maybe, ti::less_equal_comparable::maybe,
+ ti::greater_equal_comparable::nothrow>>,
+
+ // Core greater than comparable profiles
+ ProfileAndExpectation<
+ ti::HasGreaterThanProfile, ti::HasGreaterThanArchetype,
+ ti::ConformanceProfile<
+ ti::default_constructible::maybe, ti::move_constructible::maybe,
+ ti::copy_constructible::maybe, ti::move_assignable::maybe,
+ ti::copy_assignable::maybe, ti::destructible::maybe,
+ ti::equality_comparable::maybe, ti::inequality_comparable::maybe,
+ ti::less_than_comparable::maybe, ti::less_equal_comparable::maybe,
+ ti::greater_equal_comparable::maybe,
+ ti::greater_than_comparable::yes>>,
+ ProfileAndExpectation<
+ ti::HasNothrowGreaterThanProfile, ti::HasNothrowGreaterThanArchetype,
+ ti::ConformanceProfile<
+ ti::default_constructible::maybe, ti::move_constructible::maybe,
+ ti::copy_constructible::maybe, ti::move_assignable::maybe,
+ ti::copy_assignable::maybe, ti::destructible::maybe,
+ ti::equality_comparable::maybe, ti::inequality_comparable::maybe,
+ ti::less_than_comparable::maybe, ti::less_equal_comparable::maybe,
+ ti::greater_equal_comparable::maybe,
+ ti::greater_than_comparable::nothrow>>,
+
+ // Core swappable profiles
+ ProfileAndExpectation<
+ ti::HasSwapProfile, ti::HasSwapArchetype,
+ ti::ConformanceProfile<
+ ti::default_constructible::maybe, ti::move_constructible::maybe,
+ ti::copy_constructible::maybe, ti::move_assignable::maybe,
+ ti::copy_assignable::maybe, ti::destructible::maybe,
+ ti::equality_comparable::maybe, ti::inequality_comparable::maybe,
+ ti::less_than_comparable::maybe, ti::less_equal_comparable::maybe,
+ ti::greater_equal_comparable::maybe,
+ ti::greater_than_comparable::maybe, ti::swappable::yes>>,
+ ProfileAndExpectation<
+ ti::HasNothrowSwapProfile, ti::HasNothrowSwapArchetype,
+ ti::ConformanceProfile<
+ ti::default_constructible::maybe, ti::move_constructible::maybe,
+ ti::copy_constructible::maybe, ti::move_assignable::maybe,
+ ti::copy_assignable::maybe, ti::destructible::maybe,
+ ti::equality_comparable::maybe, ti::inequality_comparable::maybe,
+ ti::less_than_comparable::maybe, ti::less_equal_comparable::maybe,
+ ti::greater_equal_comparable::maybe,
+ ti::greater_than_comparable::maybe, ti::swappable::nothrow>>,
+
+ // Core hashable profiles
+ ProfileAndExpectation<
+ ti::HasStdHashSpecializationProfile,
+ ti::HasStdHashSpecializationArchetype,
+ ti::ConformanceProfile<
+ ti::default_constructible::maybe, ti::move_constructible::maybe,
+ ti::copy_constructible::maybe, ti::move_assignable::maybe,
+ ti::copy_assignable::maybe, ti::destructible::maybe,
+ ti::equality_comparable::maybe, ti::inequality_comparable::maybe,
+ ti::less_than_comparable::maybe, ti::less_equal_comparable::maybe,
+ ti::greater_equal_comparable::maybe,
+ ti::greater_than_comparable::maybe, ti::swappable::maybe,
+ ti::hashable::yes>>>;
+
+using CommonProfilesToTest = ::testing::Types<
+ // NothrowMoveConstructible
+ ProfileAndExpectation<
+ ti::NothrowMoveConstructibleProfile,
+ ti::NothrowMoveConstructibleArchetype,
+ ti::ConformanceProfile<
+ ti::default_constructible::maybe, ti::move_constructible::nothrow,
+ ti::copy_constructible::maybe, ti::move_assignable::maybe,
+ ti::copy_assignable::maybe, ti::destructible::nothrow>>,
+
+ // CopyConstructible
+ ProfileAndExpectation<
+ ti::CopyConstructibleProfile, ti::CopyConstructibleArchetype,
+ ti::ConformanceProfile<
+ ti::default_constructible::maybe, ti::move_constructible::nothrow,
+ ti::copy_constructible::yes, ti::move_assignable::maybe,
+ ti::copy_assignable::maybe, ti::destructible::nothrow>>,
+
+ // NothrowMovable
+ ProfileAndExpectation<
+ ti::NothrowMovableProfile, ti::NothrowMovableArchetype,
+ ti::ConformanceProfile<
+ ti::default_constructible::maybe, ti::move_constructible::nothrow,
+ ti::copy_constructible::maybe, ti::move_assignable::nothrow,
+ ti::copy_assignable::maybe, ti::destructible::nothrow,
+ ti::equality_comparable::maybe, ti::inequality_comparable::maybe,
+ ti::less_than_comparable::maybe, ti::less_equal_comparable::maybe,
+ ti::greater_equal_comparable::maybe,
+ ti::greater_than_comparable::maybe, ti::swappable::nothrow>>,
+
+ // Value
+ ProfileAndExpectation<
+ ti::ValueProfile, ti::ValueArchetype,
+ ti::ConformanceProfile<
+ ti::default_constructible::maybe, ti::move_constructible::nothrow,
+ ti::copy_constructible::yes, ti::move_assignable::nothrow,
+ ti::copy_assignable::yes, ti::destructible::nothrow,
+ ti::equality_comparable::maybe, ti::inequality_comparable::maybe,
+ ti::less_than_comparable::maybe, ti::less_equal_comparable::maybe,
+ ti::greater_equal_comparable::maybe,
+ ti::greater_than_comparable::maybe, ti::swappable::nothrow>>,
+
+ ////////////////////////////////////////////////////////////////////////////
+ // Common but also DefaultConstructible //
+ ////////////////////////////////////////////////////////////////////////////
+
+ // DefaultConstructibleNothrowMoveConstructible
+ ProfileAndExpectation<
+ ti::DefaultConstructibleNothrowMoveConstructibleProfile,
+ ti::DefaultConstructibleNothrowMoveConstructibleArchetype,
+ ti::ConformanceProfile<
+ ti::default_constructible::yes, ti::move_constructible::nothrow,
+ ti::copy_constructible::maybe, ti::move_assignable::maybe,
+ ti::copy_assignable::maybe, ti::destructible::nothrow>>,
+
+ // DefaultConstructibleCopyConstructible
+ ProfileAndExpectation<
+ ti::DefaultConstructibleCopyConstructibleProfile,
+ ti::DefaultConstructibleCopyConstructibleArchetype,
+ ti::ConformanceProfile<
+ ti::default_constructible::yes, ti::move_constructible::nothrow,
+ ti::copy_constructible::yes, ti::move_assignable::maybe,
+ ti::copy_assignable::maybe, ti::destructible::nothrow>>,
+
+ // DefaultConstructibleNothrowMovable
+ ProfileAndExpectation<
+ ti::DefaultConstructibleNothrowMovableProfile,
+ ti::DefaultConstructibleNothrowMovableArchetype,
+ ti::ConformanceProfile<
+ ti::default_constructible::yes, ti::move_constructible::nothrow,
+ ti::copy_constructible::maybe, ti::move_assignable::nothrow,
+ ti::copy_assignable::maybe, ti::destructible::nothrow,
+ ti::equality_comparable::maybe, ti::inequality_comparable::maybe,
+ ti::less_than_comparable::maybe, ti::less_equal_comparable::maybe,
+ ti::greater_equal_comparable::maybe,
+ ti::greater_than_comparable::maybe, ti::swappable::nothrow>>,
+
+ // DefaultConstructibleValue
+ ProfileAndExpectation<
+ ti::DefaultConstructibleValueProfile,
+ ti::DefaultConstructibleValueArchetype,
+ ti::ConformanceProfile<
+ ti::default_constructible::yes, ti::move_constructible::nothrow,
+ ti::copy_constructible::yes, ti::move_assignable::nothrow,
+ ti::copy_assignable::yes, ti::destructible::nothrow,
+ ti::equality_comparable::maybe, ti::inequality_comparable::maybe,
+ ti::less_than_comparable::maybe, ti::less_equal_comparable::maybe,
+ ti::greater_equal_comparable::maybe,
+ ti::greater_than_comparable::maybe, ti::swappable::nothrow>>>;
+
+using ComparableHelpersProfilesToTest = ::testing::Types<
+ // Equatable
+ ProfileAndExpectation<
+ ti::EquatableProfile, ti::EquatableArchetype,
+ ti::ConformanceProfile<
+ ti::default_constructible::maybe, ti::move_constructible::maybe,
+ ti::copy_constructible::maybe, ti::move_assignable::maybe,
+ ti::copy_assignable::maybe, ti::destructible::maybe,
+ ti::equality_comparable::yes, ti::inequality_comparable::yes>>,
+
+ // Comparable
+ ProfileAndExpectation<
+ ti::ComparableProfile, ti::ComparableArchetype,
+ ti::ConformanceProfile<
+ ti::default_constructible::maybe, ti::move_constructible::maybe,
+ ti::copy_constructible::maybe, ti::move_assignable::maybe,
+ ti::copy_assignable::maybe, ti::destructible::maybe,
+ ti::equality_comparable::yes, ti::inequality_comparable::yes,
+ ti::less_than_comparable::yes, ti::less_equal_comparable::yes,
+ ti::greater_equal_comparable::yes,
+ ti::greater_than_comparable::yes>>,
+
+ // NothrowEquatable
+ ProfileAndExpectation<
+ ti::NothrowEquatableProfile, ti::NothrowEquatableArchetype,
+ ti::ConformanceProfile<
+ ti::default_constructible::maybe, ti::move_constructible::maybe,
+ ti::copy_constructible::maybe, ti::move_assignable::maybe,
+ ti::copy_assignable::maybe, ti::destructible::maybe,
+ ti::equality_comparable::nothrow,
+ ti::inequality_comparable::nothrow>>,
+
+ // NothrowComparable
+ ProfileAndExpectation<
+ ti::NothrowComparableProfile, ti::NothrowComparableArchetype,
+ ti::ConformanceProfile<
+ ti::default_constructible::maybe, ti::move_constructible::maybe,
+ ti::copy_constructible::maybe, ti::move_assignable::maybe,
+ ti::copy_assignable::maybe, ti::destructible::maybe,
+ ti::equality_comparable::nothrow,
+ ti::inequality_comparable::nothrow,
+ ti::less_than_comparable::nothrow,
+ ti::less_equal_comparable::nothrow,
+ ti::greater_equal_comparable::nothrow,
+ ti::greater_than_comparable::nothrow>>>;
+
+using CommonComparableProfilesToTest = ::testing::Types<
+ // ComparableNothrowMoveConstructible
+ ProfileAndExpectation<
+ ti::ComparableNothrowMoveConstructibleProfile,
+ ti::ComparableNothrowMoveConstructibleArchetype,
+ ti::ConformanceProfile<
+ ti::default_constructible::maybe, ti::move_constructible::nothrow,
+ ti::copy_constructible::maybe, ti::move_assignable::maybe,
+ ti::copy_assignable::maybe, ti::destructible::nothrow,
+ ti::equality_comparable::yes, ti::inequality_comparable::yes,
+ ti::less_than_comparable::yes, ti::less_equal_comparable::yes,
+ ti::greater_equal_comparable::yes,
+ ti::greater_than_comparable::yes>>,
+
+ // ComparableCopyConstructible
+ ProfileAndExpectation<
+ ti::ComparableCopyConstructibleProfile,
+ ti::ComparableCopyConstructibleArchetype,
+ ti::ConformanceProfile<
+ ti::default_constructible::maybe, ti::move_constructible::nothrow,
+ ti::copy_constructible::yes, ti::move_assignable::maybe,
+ ti::copy_assignable::maybe, ti::destructible::nothrow,
+ ti::equality_comparable::yes, ti::inequality_comparable::yes,
+ ti::less_than_comparable::yes, ti::less_equal_comparable::yes,
+ ti::greater_equal_comparable::yes,
+ ti::greater_than_comparable::yes>>,
+
+ // ComparableNothrowMovable
+ ProfileAndExpectation<
+ ti::ComparableNothrowMovableProfile,
+ ti::ComparableNothrowMovableArchetype,
+ ti::ConformanceProfile<
+ ti::default_constructible::maybe, ti::move_constructible::nothrow,
+ ti::copy_constructible::maybe, ti::move_assignable::nothrow,
+ ti::copy_assignable::maybe, ti::destructible::nothrow,
+ ti::equality_comparable::yes, ti::inequality_comparable::yes,
+ ti::less_than_comparable::yes, ti::less_equal_comparable::yes,
+ ti::greater_equal_comparable::yes, ti::greater_than_comparable::yes,
+ ti::swappable::nothrow>>,
+
+ // ComparableValue
+ ProfileAndExpectation<
+ ti::ComparableValueProfile, ti::ComparableValueArchetype,
+ ti::ConformanceProfile<
+ ti::default_constructible::maybe, ti::move_constructible::nothrow,
+ ti::copy_constructible::yes, ti::move_assignable::nothrow,
+ ti::copy_assignable::yes, ti::destructible::nothrow,
+ ti::equality_comparable::yes, ti::inequality_comparable::yes,
+ ti::less_than_comparable::yes, ti::less_equal_comparable::yes,
+ ti::greater_equal_comparable::yes, ti::greater_than_comparable::yes,
+ ti::swappable::nothrow>>>;
+
+using TrivialProfilesToTest = ::testing::Types<
+ ProfileAndExpectation<
+ ti::TrivialSpecialMemberFunctionsProfile,
+ ti::TrivialSpecialMemberFunctionsArchetype,
+ ti::ConformanceProfile<
+ ti::default_constructible::trivial, ti::move_constructible::trivial,
+ ti::copy_constructible::trivial, ti::move_assignable::trivial,
+ ti::copy_assignable::trivial, ti::destructible::trivial,
+ ti::equality_comparable::maybe, ti::inequality_comparable::maybe,
+ ti::less_than_comparable::maybe, ti::less_equal_comparable::maybe,
+ ti::greater_equal_comparable::maybe,
+ ti::greater_than_comparable::maybe, ti::swappable::nothrow>>,
+
+ ProfileAndExpectation<
+ ti::TriviallyCompleteProfile, ti::TriviallyCompleteArchetype,
+ ti::ConformanceProfile<
+ ti::default_constructible::trivial, ti::move_constructible::trivial,
+ ti::copy_constructible::trivial, ti::move_assignable::trivial,
+ ti::copy_assignable::trivial, ti::destructible::trivial,
+ ti::equality_comparable::yes, ti::inequality_comparable::yes,
+ ti::less_than_comparable::yes, ti::less_equal_comparable::yes,
+ ti::greater_equal_comparable::yes, ti::greater_than_comparable::yes,
+ ti::swappable::nothrow, ti::hashable::yes>>>;
+
+INSTANTIATE_TYPED_TEST_SUITE_P(Core, ProfileTest, CoreProfilesToTest);
+INSTANTIATE_TYPED_TEST_SUITE_P(Common, ProfileTest, CommonProfilesToTest);
+INSTANTIATE_TYPED_TEST_SUITE_P(ComparableHelpers, ProfileTest,
+ ComparableHelpersProfilesToTest);
+INSTANTIATE_TYPED_TEST_SUITE_P(CommonComparable, ProfileTest,
+ CommonComparableProfilesToTest);
+INSTANTIATE_TYPED_TEST_SUITE_P(Trivial, ProfileTest, TrivialProfilesToTest);
+
+TEST(ConformanceTestingTest, Basic) {
+ using profile = ti::CombineProfiles<ti::TriviallyCompleteProfile,
+ ti::NothrowComparableProfile>;
+
+ using lim = std::numeric_limits<float>;
+
+ ABSL_INTERNAL_ASSERT_CONFORMANCE_OF(float)
+ .INITIALIZER(-lim::infinity())
+ .INITIALIZER(lim::lowest())
+ .INITIALIZER(-1.f)
+ .INITIALIZER(-lim::min())
+ .EQUIVALENCE_CLASS(INITIALIZER(-0.f), INITIALIZER(0.f))
+ .INITIALIZER(lim::min())
+ .INITIALIZER(1.f)
+ .INITIALIZER(lim::max())
+ .INITIALIZER(lim::infinity())
+ .WITH_STRICT_PROFILE(absl::types_internal::RegularityDomain, profile);
+}
+
+struct BadMoveConstruct {
+ BadMoveConstruct() = default;
+ BadMoveConstruct(BadMoveConstruct&& other) noexcept
+ : value(other.value + 1) {}
+ BadMoveConstruct& operator=(BadMoveConstruct&& other) noexcept = default;
+ int value = 0;
+
+ friend bool operator==(BadMoveConstruct const& lhs,
+ BadMoveConstruct const& rhs) {
+ return lhs.value == rhs.value;
+ }
+ friend bool operator!=(BadMoveConstruct const& lhs,
+ BadMoveConstruct const& rhs) {
+ return lhs.value != rhs.value;
+ }
+};
+
+struct BadMoveAssign {
+ BadMoveAssign() = default;
+ BadMoveAssign(BadMoveAssign&& other) noexcept = default;
+ BadMoveAssign& operator=(BadMoveAssign&& other) noexcept {
+ int new_value = other.value + 1;
+ value = new_value;
+ return *this;
+ }
+ int value = 0;
+
+ friend bool operator==(BadMoveAssign const& lhs, BadMoveAssign const& rhs) {
+ return lhs.value == rhs.value;
+ }
+ friend bool operator!=(BadMoveAssign const& lhs, BadMoveAssign const& rhs) {
+ return lhs.value != rhs.value;
+ }
+};
+
+enum class WhichCompIsBad { eq, ne, lt, le, ge, gt };
+
+template <WhichCompIsBad Which>
+struct BadCompare {
+ int value;
+
+ friend bool operator==(BadCompare const& lhs, BadCompare const& rhs) {
+ return Which == WhichCompIsBad::eq ? lhs.value != rhs.value
+ : lhs.value == rhs.value;
+ }
+
+ friend bool operator!=(BadCompare const& lhs, BadCompare const& rhs) {
+ return Which == WhichCompIsBad::ne ? lhs.value == rhs.value
+ : lhs.value != rhs.value;
+ }
+
+ friend bool operator<(BadCompare const& lhs, BadCompare const& rhs) {
+ return Which == WhichCompIsBad::lt ? lhs.value >= rhs.value
+ : lhs.value < rhs.value;
+ }
+
+ friend bool operator<=(BadCompare const& lhs, BadCompare const& rhs) {
+ return Which == WhichCompIsBad::le ? lhs.value > rhs.value
+ : lhs.value <= rhs.value;
+ }
+
+ friend bool operator>=(BadCompare const& lhs, BadCompare const& rhs) {
+ return Which == WhichCompIsBad::ge ? lhs.value < rhs.value
+ : lhs.value >= rhs.value;
+ }
+
+ friend bool operator>(BadCompare const& lhs, BadCompare const& rhs) {
+ return Which == WhichCompIsBad::gt ? lhs.value <= rhs.value
+ : lhs.value > rhs.value;
+ }
+};
+
+TEST(ConformanceTestingDeathTest, Failures) {
+ {
+ using profile = ti::CombineProfiles<ti::TriviallyCompleteProfile,
+ ti::NothrowComparableProfile>;
+
+ // Note: The initializers are intentionally in the wrong order.
+ ABSL_INTERNAL_ASSERT_NONCONFORMANCE_OF(float)
+ .INITIALIZER(1.f)
+ .INITIALIZER(0.f)
+ .WITH_LOOSE_PROFILE(profile);
+ }
+
+ {
+ using profile =
+ ti::CombineProfiles<ti::NothrowMovableProfile, ti::EquatableProfile>;
+
+ ABSL_INTERNAL_ASSERT_NONCONFORMANCE_OF(BadMoveConstruct)
+ .DUE_TO("Move construction")
+ .INITIALIZER(BadMoveConstruct())
+ .WITH_LOOSE_PROFILE(profile);
+ }
+
+ {
+ using profile =
+ ti::CombineProfiles<ti::NothrowMovableProfile, ti::EquatableProfile>;
+
+ ABSL_INTERNAL_ASSERT_NONCONFORMANCE_OF(BadMoveAssign)
+ .DUE_TO("Move assignment")
+ .INITIALIZER(BadMoveAssign())
+ .WITH_LOOSE_PROFILE(profile);
+ }
+}
+
+TEST(ConformanceTestingDeathTest, CompFailures) {
+ using profile = ti::ComparableProfile;
+
+ {
+ using BadComp = BadCompare<WhichCompIsBad::eq>;
+
+ ABSL_INTERNAL_ASSERT_NONCONFORMANCE_OF(BadComp)
+ .DUE_TO("Comparison")
+ .INITIALIZER(BadComp{0})
+ .INITIALIZER(BadComp{1})
+ .WITH_LOOSE_PROFILE(profile);
+ }
+
+ {
+ using BadComp = BadCompare<WhichCompIsBad::ne>;
+
+ ABSL_INTERNAL_ASSERT_NONCONFORMANCE_OF(BadComp)
+ .DUE_TO("Comparison")
+ .INITIALIZER(BadComp{0})
+ .INITIALIZER(BadComp{1})
+ .WITH_LOOSE_PROFILE(profile);
+ }
+
+ {
+ using BadComp = BadCompare<WhichCompIsBad::lt>;
+
+ ABSL_INTERNAL_ASSERT_NONCONFORMANCE_OF(BadComp)
+ .DUE_TO("Comparison")
+ .INITIALIZER(BadComp{0})
+ .INITIALIZER(BadComp{1})
+ .WITH_LOOSE_PROFILE(profile);
+ }
+
+ {
+ using BadComp = BadCompare<WhichCompIsBad::le>;
+
+ ABSL_INTERNAL_ASSERT_NONCONFORMANCE_OF(BadComp)
+ .DUE_TO("Comparison")
+ .INITIALIZER(BadComp{0})
+ .INITIALIZER(BadComp{1})
+ .WITH_LOOSE_PROFILE(profile);
+ }
+
+ {
+ using BadComp = BadCompare<WhichCompIsBad::ge>;
+
+ ABSL_INTERNAL_ASSERT_NONCONFORMANCE_OF(BadComp)
+ .DUE_TO("Comparison")
+ .INITIALIZER(BadComp{0})
+ .INITIALIZER(BadComp{1})
+ .WITH_LOOSE_PROFILE(profile);
+ }
+
+ {
+ using BadComp = BadCompare<WhichCompIsBad::gt>;
+
+ ABSL_INTERNAL_ASSERT_NONCONFORMANCE_OF(BadComp)
+ .DUE_TO("Comparison")
+ .INITIALIZER(BadComp{0})
+ .INITIALIZER(BadComp{1})
+ .WITH_LOOSE_PROFILE(profile);
+ }
+}
+
+struct BadSelfMove {
+ BadSelfMove() = default;
+ BadSelfMove(BadSelfMove&&) = default;
+ BadSelfMove& operator=(BadSelfMove&& other) noexcept {
+ if (this == &other) {
+ broken_state = true;
+ }
+ return *this;
+ }
+
+ friend bool operator==(const BadSelfMove& lhs, const BadSelfMove& rhs) {
+ return !(lhs.broken_state || rhs.broken_state);
+ }
+
+ friend bool operator!=(const BadSelfMove& lhs, const BadSelfMove& rhs) {
+ return lhs.broken_state || rhs.broken_state;
+ }
+
+ bool broken_state = false;
+};
+
+TEST(ConformanceTestingDeathTest, SelfMoveFailure) {
+ using profile = ti::EquatableNothrowMovableProfile;
+
+ {
+ ABSL_INTERNAL_ASSERT_NONCONFORMANCE_OF(BadSelfMove)
+ .DUE_TO("Move assignment")
+ .INITIALIZER(BadSelfMove())
+ .WITH_LOOSE_PROFILE(profile);
+ }
+}
+
+struct BadSelfCopy {
+ BadSelfCopy() = default;
+ BadSelfCopy(BadSelfCopy&&) = default;
+ BadSelfCopy(const BadSelfCopy&) = default;
+ BadSelfCopy& operator=(BadSelfCopy&&) = default;
+ BadSelfCopy& operator=(BadSelfCopy const& other) {
+ if (this == &other) {
+ broken_state = true;
+ }
+ return *this;
+ }
+
+ friend bool operator==(const BadSelfCopy& lhs, const BadSelfCopy& rhs) {
+ return !(lhs.broken_state || rhs.broken_state);
+ }
+
+ friend bool operator!=(const BadSelfCopy& lhs, const BadSelfCopy& rhs) {
+ return lhs.broken_state || rhs.broken_state;
+ }
+
+ bool broken_state = false;
+};
+
+TEST(ConformanceTestingDeathTest, SelfCopyFailure) {
+ using profile = ti::EquatableValueProfile;
+
+ {
+ ABSL_INTERNAL_ASSERT_NONCONFORMANCE_OF(BadSelfCopy)
+ .DUE_TO("Copy assignment")
+ .INITIALIZER(BadSelfCopy())
+ .WITH_LOOSE_PROFILE(profile);
+ }
+}
+
+struct BadSelfSwap {
+ friend void swap(BadSelfSwap& lhs, BadSelfSwap& rhs) noexcept {
+ if (&lhs == &rhs) lhs.broken_state = true;
+ }
+
+ friend bool operator==(const BadSelfSwap& lhs, const BadSelfSwap& rhs) {
+ return !(lhs.broken_state || rhs.broken_state);
+ }
+
+ friend bool operator!=(const BadSelfSwap& lhs, const BadSelfSwap& rhs) {
+ return lhs.broken_state || rhs.broken_state;
+ }
+
+ bool broken_state = false;
+};
+
+TEST(ConformanceTestingDeathTest, SelfSwapFailure) {
+ using profile = ti::EquatableNothrowMovableProfile;
+
+ {
+ ABSL_INTERNAL_ASSERT_NONCONFORMANCE_OF(BadSelfSwap)
+ .DUE_TO("Swap")
+ .INITIALIZER(BadSelfSwap())
+ .WITH_LOOSE_PROFILE(profile);
+ }
+}
+
+struct BadDefaultInitializedMoveAssign {
+ BadDefaultInitializedMoveAssign() : default_initialized(true) {}
+ explicit BadDefaultInitializedMoveAssign(int v) : value(v) {}
+ BadDefaultInitializedMoveAssign(
+ BadDefaultInitializedMoveAssign&& other) noexcept
+ : value(other.value) {}
+ BadDefaultInitializedMoveAssign& operator=(
+ BadDefaultInitializedMoveAssign&& other) noexcept {
+ value = other.value;
+ if (default_initialized) ++value; // Bad move if lhs is default initialized
+ return *this;
+ }
+
+ friend bool operator==(const BadDefaultInitializedMoveAssign& lhs,
+ const BadDefaultInitializedMoveAssign& rhs) {
+ return lhs.value == rhs.value;
+ }
+
+ friend bool operator!=(const BadDefaultInitializedMoveAssign& lhs,
+ const BadDefaultInitializedMoveAssign& rhs) {
+ return lhs.value != rhs.value;
+ }
+
+ bool default_initialized = false;
+ int value = 0;
+};
+
+TEST(ConformanceTestingDeathTest, DefaultInitializedMoveAssignFailure) {
+ using profile =
+ ti::CombineProfiles<ti::DefaultConstructibleNothrowMovableProfile,
+ ti::EquatableProfile>;
+
+ {
+ ABSL_INTERNAL_ASSERT_NONCONFORMANCE_OF(BadDefaultInitializedMoveAssign)
+ .DUE_TO("move assignment")
+ .INITIALIZER(BadDefaultInitializedMoveAssign(0))
+ .WITH_LOOSE_PROFILE(profile);
+ }
+}
+
+struct BadDefaultInitializedCopyAssign {
+ BadDefaultInitializedCopyAssign() : default_initialized(true) {}
+ explicit BadDefaultInitializedCopyAssign(int v) : value(v) {}
+ BadDefaultInitializedCopyAssign(
+ BadDefaultInitializedCopyAssign&& other) noexcept
+ : value(other.value) {}
+ BadDefaultInitializedCopyAssign(const BadDefaultInitializedCopyAssign& other)
+ : value(other.value) {}
+
+ BadDefaultInitializedCopyAssign& operator=(
+ BadDefaultInitializedCopyAssign&& other) noexcept {
+ value = other.value;
+ return *this;
+ }
+
+ BadDefaultInitializedCopyAssign& operator=(
+ const BadDefaultInitializedCopyAssign& other) {
+ value = other.value;
+ if (default_initialized) ++value; // Bad move if lhs is default initialized
+ return *this;
+ }
+
+ friend bool operator==(const BadDefaultInitializedCopyAssign& lhs,
+ const BadDefaultInitializedCopyAssign& rhs) {
+ return lhs.value == rhs.value;
+ }
+
+ friend bool operator!=(const BadDefaultInitializedCopyAssign& lhs,
+ const BadDefaultInitializedCopyAssign& rhs) {
+ return lhs.value != rhs.value;
+ }
+
+ bool default_initialized = false;
+ int value = 0;
+};
+
+TEST(ConformanceTestingDeathTest, DefaultInitializedAssignFailure) {
+ using profile = ti::CombineProfiles<ti::DefaultConstructibleValueProfile,
+ ti::EquatableProfile>;
+
+ {
+ ABSL_INTERNAL_ASSERT_NONCONFORMANCE_OF(BadDefaultInitializedCopyAssign)
+ .DUE_TO("copy assignment")
+ .INITIALIZER(BadDefaultInitializedCopyAssign(0))
+ .WITH_LOOSE_PROFILE(profile);
+ }
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/types/internal/optional.h b/third_party/abseil/src/absl/types/internal/optional.h
new file mode 100644
index 0000000..92932b6
--- /dev/null
+++ b/third_party/abseil/src/absl/types/internal/optional.h
@@ -0,0 +1,396 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+#ifndef ABSL_TYPES_INTERNAL_OPTIONAL_H_
+#define ABSL_TYPES_INTERNAL_OPTIONAL_H_
+
+#include <functional>
+#include <new>
+#include <type_traits>
+#include <utility>
+
+#include "absl/base/internal/inline_variable.h"
+#include "absl/memory/memory.h"
+#include "absl/meta/type_traits.h"
+#include "absl/utility/utility.h"
+
+// ABSL_OPTIONAL_USE_INHERITING_CONSTRUCTORS
+//
+// Inheriting constructors is supported in GCC 4.8+, Clang 3.3+ and MSVC 2015.
+// __cpp_inheriting_constructors is a predefined macro and a recommended way to
+// check for this language feature, but GCC doesn't support it until 5.0 and
+// Clang doesn't support it until 3.6.
+// Also, MSVC 2015 has a bug: it doesn't inherit the constexpr template
+// constructor. For example, the following code won't work on MSVC 2015 Update3:
+// struct Base {
+// int t;
+// template <typename T>
+// constexpr Base(T t_) : t(t_) {}
+// };
+// struct Foo : Base {
+// using Base::Base;
+// }
+// constexpr Foo foo(0); // doesn't work on MSVC 2015
+#if defined(__clang__)
+#if __has_feature(cxx_inheriting_constructors)
+#define ABSL_OPTIONAL_USE_INHERITING_CONSTRUCTORS 1
+#endif
+#elif (defined(__GNUC__) && \
+ (__GNUC__ > 4 || __GNUC__ == 4 && __GNUC_MINOR__ >= 8)) || \
+ (__cpp_inheriting_constructors >= 200802) || \
+ (defined(_MSC_VER) && _MSC_VER >= 1910)
+#define ABSL_OPTIONAL_USE_INHERITING_CONSTRUCTORS 1
+#endif
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+// Forward declaration
+template <typename T>
+class optional;
+
+namespace optional_internal {
+
+// This tag type is used as a constructor parameter type for `nullopt_t`.
+struct init_t {
+ explicit init_t() = default;
+};
+
+struct empty_struct {};
+
+// This class stores the data in optional<T>.
+// It is specialized based on whether T is trivially destructible.
+// This is the specialization for non trivially destructible type.
+template <typename T, bool unused = std::is_trivially_destructible<T>::value>
+class optional_data_dtor_base {
+ struct dummy_type {
+ static_assert(sizeof(T) % sizeof(empty_struct) == 0, "");
+ // Use an array to avoid GCC 6 placement-new warning.
+ empty_struct data[sizeof(T) / sizeof(empty_struct)];
+ };
+
+ protected:
+ // Whether there is data or not.
+ bool engaged_;
+ // Data storage
+ union {
+ T data_;
+ dummy_type dummy_;
+ };
+
+ void destruct() noexcept {
+ if (engaged_) {
+ data_.~T();
+ engaged_ = false;
+ }
+ }
+
+ // dummy_ must be initialized for constexpr constructor.
+ constexpr optional_data_dtor_base() noexcept : engaged_(false), dummy_{{}} {}
+
+ template <typename... Args>
+ constexpr explicit optional_data_dtor_base(in_place_t, Args&&... args)
+ : engaged_(true), data_(absl::forward<Args>(args)...) {}
+
+ ~optional_data_dtor_base() { destruct(); }
+};
+
+// Specialization for trivially destructible type.
+template <typename T>
+class optional_data_dtor_base<T, true> {
+ struct dummy_type {
+ static_assert(sizeof(T) % sizeof(empty_struct) == 0, "");
+ // Use array to avoid GCC 6 placement-new warning.
+ empty_struct data[sizeof(T) / sizeof(empty_struct)];
+ };
+
+ protected:
+ // Whether there is data or not.
+ bool engaged_;
+ // Data storage
+ union {
+ T data_;
+ dummy_type dummy_;
+ };
+ void destruct() noexcept { engaged_ = false; }
+
+ // dummy_ must be initialized for constexpr constructor.
+ constexpr optional_data_dtor_base() noexcept : engaged_(false), dummy_{{}} {}
+
+ template <typename... Args>
+ constexpr explicit optional_data_dtor_base(in_place_t, Args&&... args)
+ : engaged_(true), data_(absl::forward<Args>(args)...) {}
+};
+
+template <typename T>
+class optional_data_base : public optional_data_dtor_base<T> {
+ protected:
+ using base = optional_data_dtor_base<T>;
+#ifdef ABSL_OPTIONAL_USE_INHERITING_CONSTRUCTORS
+ using base::base;
+#else
+ optional_data_base() = default;
+
+ template <typename... Args>
+ constexpr explicit optional_data_base(in_place_t t, Args&&... args)
+ : base(t, absl::forward<Args>(args)...) {}
+#endif
+
+ template <typename... Args>
+ void construct(Args&&... args) {
+ // Use dummy_'s address to work around casting cv-qualified T* to void*.
+ ::new (static_cast<void*>(&this->dummy_)) T(std::forward<Args>(args)...);
+ this->engaged_ = true;
+ }
+
+ template <typename U>
+ void assign(U&& u) {
+ if (this->engaged_) {
+ this->data_ = std::forward<U>(u);
+ } else {
+ construct(std::forward<U>(u));
+ }
+ }
+};
+
+// TODO(absl-team): Add another class using
+// std::is_trivially_move_constructible trait when available to match
+// http://cplusplus.github.io/LWG/lwg-defects.html#2900, for types that
+// have trivial move but nontrivial copy.
+// Also, we should be checking is_trivially_copyable here, which is not
+// supported now, so we use is_trivially_* traits instead.
+template <typename T,
+ bool unused = absl::is_trivially_copy_constructible<T>::value&&
+ absl::is_trivially_copy_assignable<typename std::remove_cv<
+ T>::type>::value&& std::is_trivially_destructible<T>::value>
+class optional_data;
+
+// Trivially copyable types
+template <typename T>
+class optional_data<T, true> : public optional_data_base<T> {
+ protected:
+#ifdef ABSL_OPTIONAL_USE_INHERITING_CONSTRUCTORS
+ using optional_data_base<T>::optional_data_base;
+#else
+ optional_data() = default;
+
+ template <typename... Args>
+ constexpr explicit optional_data(in_place_t t, Args&&... args)
+ : optional_data_base<T>(t, absl::forward<Args>(args)...) {}
+#endif
+};
+
+template <typename T>
+class optional_data<T, false> : public optional_data_base<T> {
+ protected:
+#ifdef ABSL_OPTIONAL_USE_INHERITING_CONSTRUCTORS
+ using optional_data_base<T>::optional_data_base;
+#else
+ template <typename... Args>
+ constexpr explicit optional_data(in_place_t t, Args&&... args)
+ : optional_data_base<T>(t, absl::forward<Args>(args)...) {}
+#endif
+
+ optional_data() = default;
+
+ optional_data(const optional_data& rhs) : optional_data_base<T>() {
+ if (rhs.engaged_) {
+ this->construct(rhs.data_);
+ }
+ }
+
+ optional_data(optional_data&& rhs) noexcept(
+ absl::default_allocator_is_nothrow::value ||
+ std::is_nothrow_move_constructible<T>::value)
+ : optional_data_base<T>() {
+ if (rhs.engaged_) {
+ this->construct(std::move(rhs.data_));
+ }
+ }
+
+ optional_data& operator=(const optional_data& rhs) {
+ if (rhs.engaged_) {
+ this->assign(rhs.data_);
+ } else {
+ this->destruct();
+ }
+ return *this;
+ }
+
+ optional_data& operator=(optional_data&& rhs) noexcept(
+ std::is_nothrow_move_assignable<T>::value&&
+ std::is_nothrow_move_constructible<T>::value) {
+ if (rhs.engaged_) {
+ this->assign(std::move(rhs.data_));
+ } else {
+ this->destruct();
+ }
+ return *this;
+ }
+};
+
+// Ordered by level of restriction, from low to high.
+// Copyable implies movable.
+enum class copy_traits { copyable = 0, movable = 1, non_movable = 2 };
+
+// Base class for enabling/disabling copy/move constructor.
+template <copy_traits>
+class optional_ctor_base;
+
+template <>
+class optional_ctor_base<copy_traits::copyable> {
+ public:
+ constexpr optional_ctor_base() = default;
+ optional_ctor_base(const optional_ctor_base&) = default;
+ optional_ctor_base(optional_ctor_base&&) = default;
+ optional_ctor_base& operator=(const optional_ctor_base&) = default;
+ optional_ctor_base& operator=(optional_ctor_base&&) = default;
+};
+
+template <>
+class optional_ctor_base<copy_traits::movable> {
+ public:
+ constexpr optional_ctor_base() = default;
+ optional_ctor_base(const optional_ctor_base&) = delete;
+ optional_ctor_base(optional_ctor_base&&) = default;
+ optional_ctor_base& operator=(const optional_ctor_base&) = default;
+ optional_ctor_base& operator=(optional_ctor_base&&) = default;
+};
+
+template <>
+class optional_ctor_base<copy_traits::non_movable> {
+ public:
+ constexpr optional_ctor_base() = default;
+ optional_ctor_base(const optional_ctor_base&) = delete;
+ optional_ctor_base(optional_ctor_base&&) = delete;
+ optional_ctor_base& operator=(const optional_ctor_base&) = default;
+ optional_ctor_base& operator=(optional_ctor_base&&) = default;
+};
+
+// Base class for enabling/disabling copy/move assignment.
+template <copy_traits>
+class optional_assign_base;
+
+template <>
+class optional_assign_base<copy_traits::copyable> {
+ public:
+ constexpr optional_assign_base() = default;
+ optional_assign_base(const optional_assign_base&) = default;
+ optional_assign_base(optional_assign_base&&) = default;
+ optional_assign_base& operator=(const optional_assign_base&) = default;
+ optional_assign_base& operator=(optional_assign_base&&) = default;
+};
+
+template <>
+class optional_assign_base<copy_traits::movable> {
+ public:
+ constexpr optional_assign_base() = default;
+ optional_assign_base(const optional_assign_base&) = default;
+ optional_assign_base(optional_assign_base&&) = default;
+ optional_assign_base& operator=(const optional_assign_base&) = delete;
+ optional_assign_base& operator=(optional_assign_base&&) = default;
+};
+
+template <>
+class optional_assign_base<copy_traits::non_movable> {
+ public:
+ constexpr optional_assign_base() = default;
+ optional_assign_base(const optional_assign_base&) = default;
+ optional_assign_base(optional_assign_base&&) = default;
+ optional_assign_base& operator=(const optional_assign_base&) = delete;
+ optional_assign_base& operator=(optional_assign_base&&) = delete;
+};
+
+template <typename T>
+struct ctor_copy_traits {
+ static constexpr copy_traits traits =
+ std::is_copy_constructible<T>::value
+ ? copy_traits::copyable
+ : std::is_move_constructible<T>::value ? copy_traits::movable
+ : copy_traits::non_movable;
+};
+
+template <typename T>
+struct assign_copy_traits {
+ static constexpr copy_traits traits =
+ absl::is_copy_assignable<T>::value && std::is_copy_constructible<T>::value
+ ? copy_traits::copyable
+ : absl::is_move_assignable<T>::value &&
+ std::is_move_constructible<T>::value
+ ? copy_traits::movable
+ : copy_traits::non_movable;
+};
+
+// Whether T is constructible or convertible from optional<U>.
+template <typename T, typename U>
+struct is_constructible_convertible_from_optional
+ : std::integral_constant<
+ bool, std::is_constructible<T, optional<U>&>::value ||
+ std::is_constructible<T, optional<U>&&>::value ||
+ std::is_constructible<T, const optional<U>&>::value ||
+ std::is_constructible<T, const optional<U>&&>::value ||
+ std::is_convertible<optional<U>&, T>::value ||
+ std::is_convertible<optional<U>&&, T>::value ||
+ std::is_convertible<const optional<U>&, T>::value ||
+ std::is_convertible<const optional<U>&&, T>::value> {};
+
+// Whether T is constructible or convertible or assignable from optional<U>.
+template <typename T, typename U>
+struct is_constructible_convertible_assignable_from_optional
+ : std::integral_constant<
+ bool, is_constructible_convertible_from_optional<T, U>::value ||
+ std::is_assignable<T&, optional<U>&>::value ||
+ std::is_assignable<T&, optional<U>&&>::value ||
+ std::is_assignable<T&, const optional<U>&>::value ||
+ std::is_assignable<T&, const optional<U>&&>::value> {};
+
+// Helper function used by [optional.relops], [optional.comp_with_t],
+// for checking whether an expression is convertible to bool.
+bool convertible_to_bool(bool);
+
+// Base class for std::hash<absl::optional<T>>:
+// If std::hash<std::remove_const_t<T>> is enabled, it provides operator() to
+// compute the hash; Otherwise, it is disabled.
+// Reference N4659 23.14.15 [unord.hash].
+template <typename T, typename = size_t>
+struct optional_hash_base {
+ optional_hash_base() = delete;
+ optional_hash_base(const optional_hash_base&) = delete;
+ optional_hash_base(optional_hash_base&&) = delete;
+ optional_hash_base& operator=(const optional_hash_base&) = delete;
+ optional_hash_base& operator=(optional_hash_base&&) = delete;
+};
+
+template <typename T>
+struct optional_hash_base<T, decltype(std::hash<absl::remove_const_t<T> >()(
+ std::declval<absl::remove_const_t<T> >()))> {
+ using argument_type = absl::optional<T>;
+ using result_type = size_t;
+ size_t operator()(const absl::optional<T>& opt) const {
+ absl::type_traits_internal::AssertHashEnabled<absl::remove_const_t<T>>();
+ if (opt) {
+ return std::hash<absl::remove_const_t<T> >()(*opt);
+ } else {
+ return static_cast<size_t>(0x297814aaad196e6dULL);
+ }
+ }
+};
+
+} // namespace optional_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#undef ABSL_OPTIONAL_USE_INHERITING_CONSTRUCTORS
+
+#endif // ABSL_TYPES_INTERNAL_OPTIONAL_H_
diff --git a/third_party/abseil/src/absl/types/internal/parentheses.h b/third_party/abseil/src/absl/types/internal/parentheses.h
new file mode 100644
index 0000000..5aebee8
--- /dev/null
+++ b/third_party/abseil/src/absl/types/internal/parentheses.h
@@ -0,0 +1,34 @@
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// parentheses.h
+// -----------------------------------------------------------------------------
+//
+// This file contains macros that expand to a left parenthesis and a right
+// parenthesis. These are in their own file and are generated from macros
+// because otherwise clang-format gets confused and clang-format off directives
+// do not help.
+//
+// The parentheses macros are used when wanting to require a rescan before
+// expansion of parenthesized text appearing after a function-style macro name.
+
+#ifndef ABSL_TYPES_INTERNAL_PARENTHESES_H_
+#define ABSL_TYPES_INTERNAL_PARENTHESES_H_
+
+#define ABSL_INTERNAL_LPAREN (
+
+#define ABSL_INTERNAL_RPAREN )
+
+#endif // ABSL_TYPES_INTERNAL_PARENTHESES_H_
diff --git a/third_party/abseil/src/absl/types/internal/span.h b/third_party/abseil/src/absl/types/internal/span.h
new file mode 100644
index 0000000..112612f
--- /dev/null
+++ b/third_party/abseil/src/absl/types/internal/span.h
@@ -0,0 +1,128 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+#ifndef ABSL_TYPES_INTERNAL_SPAN_H_
+#define ABSL_TYPES_INTERNAL_SPAN_H_
+
+#include <algorithm>
+#include <cstddef>
+#include <string>
+#include <type_traits>
+
+#include "absl/algorithm/algorithm.h"
+#include "absl/base/internal/throw_delegate.h"
+#include "absl/meta/type_traits.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+namespace span_internal {
+// A constexpr min function
+constexpr size_t Min(size_t a, size_t b) noexcept { return a < b ? a : b; }
+
+// Wrappers for access to container data pointers.
+template <typename C>
+constexpr auto GetDataImpl(C& c, char) noexcept // NOLINT(runtime/references)
+ -> decltype(c.data()) {
+ return c.data();
+}
+
+// Before C++17, std::string::data returns a const char* in all cases.
+inline char* GetDataImpl(std::string& s, // NOLINT(runtime/references)
+ int) noexcept {
+ return &s[0];
+}
+
+template <typename C>
+constexpr auto GetData(C& c) noexcept // NOLINT(runtime/references)
+ -> decltype(GetDataImpl(c, 0)) {
+ return GetDataImpl(c, 0);
+}
+
+// Detection idioms for size() and data().
+template <typename C>
+using HasSize =
+ std::is_integral<absl::decay_t<decltype(std::declval<C&>().size())>>;
+
+// We want to enable conversion from vector<T*> to Span<const T* const> but
+// disable conversion from vector<Derived> to Span<Base>. Here we use
+// the fact that U** is convertible to Q* const* if and only if Q is the same
+// type or a more cv-qualified version of U. We also decay the result type of
+// data() to avoid problems with classes which have a member function data()
+// which returns a reference.
+template <typename T, typename C>
+using HasData =
+ std::is_convertible<absl::decay_t<decltype(GetData(std::declval<C&>()))>*,
+ T* const*>;
+
+// Extracts value type from a Container
+template <typename C>
+struct ElementType {
+ using type = typename absl::remove_reference_t<C>::value_type;
+};
+
+template <typename T, size_t N>
+struct ElementType<T (&)[N]> {
+ using type = T;
+};
+
+template <typename C>
+using ElementT = typename ElementType<C>::type;
+
+template <typename T>
+using EnableIfMutable =
+ typename std::enable_if<!std::is_const<T>::value, int>::type;
+
+template <template <typename> class SpanT, typename T>
+bool EqualImpl(SpanT<T> a, SpanT<T> b) {
+ static_assert(std::is_const<T>::value, "");
+ return absl::equal(a.begin(), a.end(), b.begin(), b.end());
+}
+
+template <template <typename> class SpanT, typename T>
+bool LessThanImpl(SpanT<T> a, SpanT<T> b) {
+ // We can't use value_type since that is remove_cv_t<T>, so we go the long way
+ // around.
+ static_assert(std::is_const<T>::value, "");
+ return std::lexicographical_compare(a.begin(), a.end(), b.begin(), b.end());
+}
+
+// The `IsConvertible` classes here are needed because of the
+// `std::is_convertible` bug in libcxx when compiled with GCC. This build
+// configuration is used by Android NDK toolchain. Reference link:
+// https://bugs.llvm.org/show_bug.cgi?id=27538.
+template <typename From, typename To>
+struct IsConvertibleHelper {
+ private:
+ static std::true_type testval(To);
+ static std::false_type testval(...);
+
+ public:
+ using type = decltype(testval(std::declval<From>()));
+};
+
+template <typename From, typename To>
+struct IsConvertible : IsConvertibleHelper<From, To>::type {};
+
+// TODO(zhangxy): replace `IsConvertible` with `std::is_convertible` once the
+// older version of libcxx is not supported.
+template <typename From, typename To>
+using EnableIfConvertibleTo =
+ typename std::enable_if<IsConvertible<From, To>::value>::type;
+} // namespace span_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_TYPES_INTERNAL_SPAN_H_
diff --git a/third_party/abseil/src/absl/types/internal/transform_args.h b/third_party/abseil/src/absl/types/internal/transform_args.h
new file mode 100644
index 0000000..4a0ab42
--- /dev/null
+++ b/third_party/abseil/src/absl/types/internal/transform_args.h
@@ -0,0 +1,246 @@
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// transform_args.h
+// -----------------------------------------------------------------------------
+//
+// This file contains a higher-order macro that "transforms" each element of a
+// a variadic argument by a provided secondary macro.
+
+#ifndef ABSL_TYPES_INTERNAL_TRANSFORM_ARGS_H_
+#define ABSL_TYPES_INTERNAL_TRANSFORM_ARGS_H_
+
+//
+// ABSL_INTERNAL_CAT(a, b)
+//
+// This macro takes two arguments and concatenates them together via ## after
+// expansion.
+//
+// Example:
+//
+// ABSL_INTERNAL_CAT(foo_, bar)
+//
+// Results in:
+//
+// foo_bar
+#define ABSL_INTERNAL_CAT(a, b) ABSL_INTERNAL_CAT_IMPL(a, b)
+#define ABSL_INTERNAL_CAT_IMPL(a, b) a##b
+
+//
+// ABSL_INTERNAL_TRANSFORM_ARGS(m, ...)
+//
+// This macro takes another macro as an argument followed by a trailing series
+// of additional parameters (up to 32 additional arguments). It invokes the
+// passed-in macro once for each of the additional arguments, with the
+// expansions separated by commas.
+//
+// Example:
+//
+// ABSL_INTERNAL_TRANSFORM_ARGS(MY_MACRO, a, b, c)
+//
+// Results in:
+//
+// MY_MACRO(a), MY_MACRO(b), MY_MACRO(c)
+//
+// TODO(calabrese) Handle no arguments as a special case.
+#define ABSL_INTERNAL_TRANSFORM_ARGS(m, ...) \
+ ABSL_INTERNAL_CAT(ABSL_INTERNAL_TRANSFORM_ARGS, \
+ ABSL_INTERNAL_NUM_ARGS(__VA_ARGS__)) \
+ (m, __VA_ARGS__)
+
+#define ABSL_INTERNAL_TRANSFORM_ARGS1(m, a0) m(a0)
+
+#define ABSL_INTERNAL_TRANSFORM_ARGS2(m, a0, a1) m(a0), m(a1)
+
+#define ABSL_INTERNAL_TRANSFORM_ARGS3(m, a0, a1, a2) m(a0), m(a1), m(a2)
+
+#define ABSL_INTERNAL_TRANSFORM_ARGS4(m, a0, a1, a2, a3) \
+ m(a0), m(a1), m(a2), m(a3)
+
+#define ABSL_INTERNAL_TRANSFORM_ARGS5(m, a0, a1, a2, a3, a4) \
+ m(a0), m(a1), m(a2), m(a3), m(a4)
+
+#define ABSL_INTERNAL_TRANSFORM_ARGS6(m, a0, a1, a2, a3, a4, a5) \
+ m(a0), m(a1), m(a2), m(a3), m(a4), m(a5)
+
+#define ABSL_INTERNAL_TRANSFORM_ARGS7(m, a0, a1, a2, a3, a4, a5, a6) \
+ m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6)
+
+#define ABSL_INTERNAL_TRANSFORM_ARGS8(m, a0, a1, a2, a3, a4, a5, a6, a7) \
+ m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7)
+
+#define ABSL_INTERNAL_TRANSFORM_ARGS9(m, a0, a1, a2, a3, a4, a5, a6, a7, a8) \
+ m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8)
+
+#define ABSL_INTERNAL_TRANSFORM_ARGS10(m, a0, a1, a2, a3, a4, a5, a6, a7, a8, \
+ a9) \
+ m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9)
+
+#define ABSL_INTERNAL_TRANSFORM_ARGS11(m, a0, a1, a2, a3, a4, a5, a6, a7, a8, \
+ a9, a10) \
+ m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9), m(a10)
+
+#define ABSL_INTERNAL_TRANSFORM_ARGS12(m, a0, a1, a2, a3, a4, a5, a6, a7, a8, \
+ a9, a10, a11) \
+ m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9), \
+ m(a10), m(a11)
+
+#define ABSL_INTERNAL_TRANSFORM_ARGS13(m, a0, a1, a2, a3, a4, a5, a6, a7, a8, \
+ a9, a10, a11, a12) \
+ m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9), \
+ m(a10), m(a11), m(a12)
+
+#define ABSL_INTERNAL_TRANSFORM_ARGS14(m, a0, a1, a2, a3, a4, a5, a6, a7, a8, \
+ a9, a10, a11, a12, a13) \
+ m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9), \
+ m(a10), m(a11), m(a12), m(a13)
+
+#define ABSL_INTERNAL_TRANSFORM_ARGS15(m, a0, a1, a2, a3, a4, a5, a6, a7, a8, \
+ a9, a10, a11, a12, a13, a14) \
+ m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9), \
+ m(a10), m(a11), m(a12), m(a13), m(a14)
+
+#define ABSL_INTERNAL_TRANSFORM_ARGS16(m, a0, a1, a2, a3, a4, a5, a6, a7, a8, \
+ a9, a10, a11, a12, a13, a14, a15) \
+ m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9), \
+ m(a10), m(a11), m(a12), m(a13), m(a14), m(a15)
+
+#define ABSL_INTERNAL_TRANSFORM_ARGS17(m, a0, a1, a2, a3, a4, a5, a6, a7, a8, \
+ a9, a10, a11, a12, a13, a14, a15, a16) \
+ m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9), \
+ m(a10), m(a11), m(a12), m(a13), m(a14), m(a15), m(a16)
+
+#define ABSL_INTERNAL_TRANSFORM_ARGS18(m, a0, a1, a2, a3, a4, a5, a6, a7, a8, \
+ a9, a10, a11, a12, a13, a14, a15, a16, \
+ a17) \
+ m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9), \
+ m(a10), m(a11), m(a12), m(a13), m(a14), m(a15), m(a16), m(a17)
+
+#define ABSL_INTERNAL_TRANSFORM_ARGS19(m, a0, a1, a2, a3, a4, a5, a6, a7, a8, \
+ a9, a10, a11, a12, a13, a14, a15, a16, \
+ a17, a18) \
+ m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9), \
+ m(a10), m(a11), m(a12), m(a13), m(a14), m(a15), m(a16), m(a17), m(a18)
+
+#define ABSL_INTERNAL_TRANSFORM_ARGS20(m, a0, a1, a2, a3, a4, a5, a6, a7, a8, \
+ a9, a10, a11, a12, a13, a14, a15, a16, \
+ a17, a18, a19) \
+ m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9), \
+ m(a10), m(a11), m(a12), m(a13), m(a14), m(a15), m(a16), m(a17), m(a18), \
+ m(a19)
+
+#define ABSL_INTERNAL_TRANSFORM_ARGS21(m, a0, a1, a2, a3, a4, a5, a6, a7, a8, \
+ a9, a10, a11, a12, a13, a14, a15, a16, \
+ a17, a18, a19, a20) \
+ m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9), \
+ m(a10), m(a11), m(a12), m(a13), m(a14), m(a15), m(a16), m(a17), m(a18), \
+ m(a19), m(a20)
+
+#define ABSL_INTERNAL_TRANSFORM_ARGS22(m, a0, a1, a2, a3, a4, a5, a6, a7, a8, \
+ a9, a10, a11, a12, a13, a14, a15, a16, \
+ a17, a18, a19, a20, a21) \
+ m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9), \
+ m(a10), m(a11), m(a12), m(a13), m(a14), m(a15), m(a16), m(a17), m(a18), \
+ m(a19), m(a20), m(a21)
+
+#define ABSL_INTERNAL_TRANSFORM_ARGS23(m, a0, a1, a2, a3, a4, a5, a6, a7, a8, \
+ a9, a10, a11, a12, a13, a14, a15, a16, \
+ a17, a18, a19, a20, a21, a22) \
+ m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9), \
+ m(a10), m(a11), m(a12), m(a13), m(a14), m(a15), m(a16), m(a17), m(a18), \
+ m(a19), m(a20), m(a21), m(a22)
+
+#define ABSL_INTERNAL_TRANSFORM_ARGS24(m, a0, a1, a2, a3, a4, a5, a6, a7, a8, \
+ a9, a10, a11, a12, a13, a14, a15, a16, \
+ a17, a18, a19, a20, a21, a22, a23) \
+ m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9), \
+ m(a10), m(a11), m(a12), m(a13), m(a14), m(a15), m(a16), m(a17), m(a18), \
+ m(a19), m(a20), m(a21), m(a22), m(a23)
+
+#define ABSL_INTERNAL_TRANSFORM_ARGS25(m, a0, a1, a2, a3, a4, a5, a6, a7, a8, \
+ a9, a10, a11, a12, a13, a14, a15, a16, \
+ a17, a18, a19, a20, a21, a22, a23, a24) \
+ m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9), \
+ m(a10), m(a11), m(a12), m(a13), m(a14), m(a15), m(a16), m(a17), m(a18), \
+ m(a19), m(a20), m(a21), m(a22), m(a23), m(a24)
+
+#define ABSL_INTERNAL_TRANSFORM_ARGS26( \
+ m, a0, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15, \
+ a16, a17, a18, a19, a20, a21, a22, a23, a24, a25) \
+ m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9), \
+ m(a10), m(a11), m(a12), m(a13), m(a14), m(a15), m(a16), m(a17), m(a18), \
+ m(a19), m(a20), m(a21), m(a22), m(a23), m(a24), m(a25)
+
+#define ABSL_INTERNAL_TRANSFORM_ARGS27( \
+ m, a0, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15, \
+ a16, a17, a18, a19, a20, a21, a22, a23, a24, a25, a26) \
+ m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9), \
+ m(a10), m(a11), m(a12), m(a13), m(a14), m(a15), m(a16), m(a17), m(a18), \
+ m(a19), m(a20), m(a21), m(a22), m(a23), m(a24), m(a25), m(a26)
+
+#define ABSL_INTERNAL_TRANSFORM_ARGS28( \
+ m, a0, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15, \
+ a16, a17, a18, a19, a20, a21, a22, a23, a24, a25, a26, a27) \
+ m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9), \
+ m(a10), m(a11), m(a12), m(a13), m(a14), m(a15), m(a16), m(a17), m(a18), \
+ m(a19), m(a20), m(a21), m(a22), m(a23), m(a24), m(a25), m(a26), m(a27)
+
+#define ABSL_INTERNAL_TRANSFORM_ARGS29( \
+ m, a0, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15, \
+ a16, a17, a18, a19, a20, a21, a22, a23, a24, a25, a26, a27, a28) \
+ m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9), \
+ m(a10), m(a11), m(a12), m(a13), m(a14), m(a15), m(a16), m(a17), m(a18), \
+ m(a19), m(a20), m(a21), m(a22), m(a23), m(a24), m(a25), m(a26), m(a27), \
+ m(a28)
+
+#define ABSL_INTERNAL_TRANSFORM_ARGS30( \
+ m, a0, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15, \
+ a16, a17, a18, a19, a20, a21, a22, a23, a24, a25, a26, a27, a28, a29) \
+ m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9), \
+ m(a10), m(a11), m(a12), m(a13), m(a14), m(a15), m(a16), m(a17), m(a18), \
+ m(a19), m(a20), m(a21), m(a22), m(a23), m(a24), m(a25), m(a26), m(a27), \
+ m(a28), m(a29)
+
+#define ABSL_INTERNAL_TRANSFORM_ARGS31( \
+ m, a0, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15, \
+ a16, a17, a18, a19, a20, a21, a22, a23, a24, a25, a26, a27, a28, a29, a30) \
+ m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9), \
+ m(a10), m(a11), m(a12), m(a13), m(a14), m(a15), m(a16), m(a17), m(a18), \
+ m(a19), m(a20), m(a21), m(a22), m(a23), m(a24), m(a25), m(a26), m(a27), \
+ m(a28), m(a29), m(a30)
+
+#define ABSL_INTERNAL_TRANSFORM_ARGS32(m, a0, a1, a2, a3, a4, a5, a6, a7, a8, \
+ a9, a10, a11, a12, a13, a14, a15, a16, \
+ a17, a18, a19, a20, a21, a22, a23, a24, \
+ a25, a26, a27, a28, a29, a30, a31) \
+ m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9), \
+ m(a10), m(a11), m(a12), m(a13), m(a14), m(a15), m(a16), m(a17), m(a18), \
+ m(a19), m(a20), m(a21), m(a22), m(a23), m(a24), m(a25), m(a26), m(a27), \
+ m(a28), m(a29), m(a30), m(a31)
+
+#define ABSL_INTERNAL_NUM_ARGS_IMPL(a0, a1, a2, a3, a4, a5, a6, a7, a8, a9, \
+ a10, a11, a12, a13, a14, a15, a16, a17, \
+ a18, a19, a20, a21, a22, a23, a24, a25, \
+ a26, a27, a28, a29, a30, a31, result, ...) \
+ result
+
+#define ABSL_INTERNAL_FORCE_EXPANSION(...) __VA_ARGS__
+
+#define ABSL_INTERNAL_NUM_ARGS(...) \
+ ABSL_INTERNAL_FORCE_EXPANSION(ABSL_INTERNAL_NUM_ARGS_IMPL( \
+ __VA_ARGS__, 32, 31, 30, 29, 28, 27, 26, 25, 24, 23, 22, 21, 20, 19, 18, \
+ 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, ))
+
+#endif // ABSL_TYPES_INTERNAL_TRANSFORM_ARGS_H_
diff --git a/third_party/abseil/src/absl/types/internal/variant.h b/third_party/abseil/src/absl/types/internal/variant.h
new file mode 100644
index 0000000..772008c
--- /dev/null
+++ b/third_party/abseil/src/absl/types/internal/variant.h
@@ -0,0 +1,1646 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// Implementation details of absl/types/variant.h, pulled into a
+// separate file to avoid cluttering the top of the API header with
+// implementation details.
+
+#ifndef ABSL_TYPES_variant_internal_H_
+#define ABSL_TYPES_variant_internal_H_
+
+#include <cassert>
+#include <cstddef>
+#include <cstdlib>
+#include <memory>
+#include <stdexcept>
+#include <tuple>
+#include <type_traits>
+
+#include "absl/base/config.h"
+#include "absl/base/internal/identity.h"
+#include "absl/base/internal/inline_variable.h"
+#include "absl/base/internal/invoke.h"
+#include "absl/base/macros.h"
+#include "absl/base/optimization.h"
+#include "absl/meta/type_traits.h"
+#include "absl/types/bad_variant_access.h"
+#include "absl/utility/utility.h"
+
+#if !defined(ABSL_USES_STD_VARIANT)
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+template <class... Types>
+class variant;
+
+ABSL_INTERNAL_INLINE_CONSTEXPR(size_t, variant_npos, static_cast<size_t>(-1));
+
+template <class T>
+struct variant_size;
+
+template <std::size_t I, class T>
+struct variant_alternative;
+
+namespace variant_internal {
+
+// NOTE: See specializations below for details.
+template <std::size_t I, class T>
+struct VariantAlternativeSfinae {};
+
+// Requires: I < variant_size_v<T>.
+//
+// Value: The Ith type of Types...
+template <std::size_t I, class T0, class... Tn>
+struct VariantAlternativeSfinae<I, variant<T0, Tn...>>
+ : VariantAlternativeSfinae<I - 1, variant<Tn...>> {};
+
+// Value: T0
+template <class T0, class... Ts>
+struct VariantAlternativeSfinae<0, variant<T0, Ts...>> {
+ using type = T0;
+};
+
+template <std::size_t I, class T>
+using VariantAlternativeSfinaeT = typename VariantAlternativeSfinae<I, T>::type;
+
+// NOTE: Requires T to be a reference type.
+template <class T, class U>
+struct GiveQualsTo;
+
+template <class T, class U>
+struct GiveQualsTo<T&, U> {
+ using type = U&;
+};
+
+template <class T, class U>
+struct GiveQualsTo<T&&, U> {
+ using type = U&&;
+};
+
+template <class T, class U>
+struct GiveQualsTo<const T&, U> {
+ using type = const U&;
+};
+
+template <class T, class U>
+struct GiveQualsTo<const T&&, U> {
+ using type = const U&&;
+};
+
+template <class T, class U>
+struct GiveQualsTo<volatile T&, U> {
+ using type = volatile U&;
+};
+
+template <class T, class U>
+struct GiveQualsTo<volatile T&&, U> {
+ using type = volatile U&&;
+};
+
+template <class T, class U>
+struct GiveQualsTo<volatile const T&, U> {
+ using type = volatile const U&;
+};
+
+template <class T, class U>
+struct GiveQualsTo<volatile const T&&, U> {
+ using type = volatile const U&&;
+};
+
+template <class T, class U>
+using GiveQualsToT = typename GiveQualsTo<T, U>::type;
+
+// Convenience alias, since size_t integral_constant is used a lot in this file.
+template <std::size_t I>
+using SizeT = std::integral_constant<std::size_t, I>;
+
+using NPos = SizeT<variant_npos>;
+
+template <class Variant, class T, class = void>
+struct IndexOfConstructedType {};
+
+template <std::size_t I, class Variant>
+struct VariantAccessResultImpl;
+
+template <std::size_t I, template <class...> class Variantemplate, class... T>
+struct VariantAccessResultImpl<I, Variantemplate<T...>&> {
+ using type = typename absl::variant_alternative<I, variant<T...>>::type&;
+};
+
+template <std::size_t I, template <class...> class Variantemplate, class... T>
+struct VariantAccessResultImpl<I, const Variantemplate<T...>&> {
+ using type =
+ const typename absl::variant_alternative<I, variant<T...>>::type&;
+};
+
+template <std::size_t I, template <class...> class Variantemplate, class... T>
+struct VariantAccessResultImpl<I, Variantemplate<T...>&&> {
+ using type = typename absl::variant_alternative<I, variant<T...>>::type&&;
+};
+
+template <std::size_t I, template <class...> class Variantemplate, class... T>
+struct VariantAccessResultImpl<I, const Variantemplate<T...>&&> {
+ using type =
+ const typename absl::variant_alternative<I, variant<T...>>::type&&;
+};
+
+template <std::size_t I, class Variant>
+using VariantAccessResult =
+ typename VariantAccessResultImpl<I, Variant&&>::type;
+
+// NOTE: This is used instead of std::array to reduce instantiation overhead.
+template <class T, std::size_t Size>
+struct SimpleArray {
+ static_assert(Size != 0, "");
+ T value[Size];
+};
+
+template <class T>
+struct AccessedType {
+ using type = T;
+};
+
+template <class T>
+using AccessedTypeT = typename AccessedType<T>::type;
+
+template <class T, std::size_t Size>
+struct AccessedType<SimpleArray<T, Size>> {
+ using type = AccessedTypeT<T>;
+};
+
+template <class T>
+constexpr T AccessSimpleArray(const T& value) {
+ return value;
+}
+
+template <class T, std::size_t Size, class... SizeT>
+constexpr AccessedTypeT<T> AccessSimpleArray(const SimpleArray<T, Size>& table,
+ std::size_t head_index,
+ SizeT... tail_indices) {
+ return AccessSimpleArray(table.value[head_index], tail_indices...);
+}
+
+// Note: Intentionally is an alias.
+template <class T>
+using AlwaysZero = SizeT<0>;
+
+template <class Op, class... Vs>
+struct VisitIndicesResultImpl {
+ using type = absl::result_of_t<Op(AlwaysZero<Vs>...)>;
+};
+
+template <class Op, class... Vs>
+using VisitIndicesResultT = typename VisitIndicesResultImpl<Op, Vs...>::type;
+
+template <class ReturnType, class FunctionObject, class EndIndices,
+ class BoundIndices>
+struct MakeVisitationMatrix;
+
+template <class ReturnType, class FunctionObject, std::size_t... Indices>
+constexpr ReturnType call_with_indices(FunctionObject&& function) {
+ static_assert(
+ std::is_same<ReturnType, decltype(std::declval<FunctionObject>()(
+ SizeT<Indices>()...))>::value,
+ "Not all visitation overloads have the same return type.");
+ return absl::forward<FunctionObject>(function)(SizeT<Indices>()...);
+}
+
+template <class ReturnType, class FunctionObject, std::size_t... BoundIndices>
+struct MakeVisitationMatrix<ReturnType, FunctionObject, index_sequence<>,
+ index_sequence<BoundIndices...>> {
+ using ResultType = ReturnType (*)(FunctionObject&&);
+ static constexpr ResultType Run() {
+ return &call_with_indices<ReturnType, FunctionObject,
+ (BoundIndices - 1)...>;
+ }
+};
+
+template <typename Is, std::size_t J>
+struct AppendToIndexSequence;
+
+template <typename Is, std::size_t J>
+using AppendToIndexSequenceT = typename AppendToIndexSequence<Is, J>::type;
+
+template <std::size_t... Is, std::size_t J>
+struct AppendToIndexSequence<index_sequence<Is...>, J> {
+ using type = index_sequence<Is..., J>;
+};
+
+template <class ReturnType, class FunctionObject, class EndIndices,
+ class CurrIndices, class BoundIndices>
+struct MakeVisitationMatrixImpl;
+
+template <class ReturnType, class FunctionObject, class EndIndices,
+ std::size_t... CurrIndices, class BoundIndices>
+struct MakeVisitationMatrixImpl<ReturnType, FunctionObject, EndIndices,
+ index_sequence<CurrIndices...>, BoundIndices> {
+ using ResultType = SimpleArray<
+ typename MakeVisitationMatrix<ReturnType, FunctionObject, EndIndices,
+ index_sequence<>>::ResultType,
+ sizeof...(CurrIndices)>;
+
+ static constexpr ResultType Run() {
+ return {{MakeVisitationMatrix<
+ ReturnType, FunctionObject, EndIndices,
+ AppendToIndexSequenceT<BoundIndices, CurrIndices>>::Run()...}};
+ }
+};
+
+template <class ReturnType, class FunctionObject, std::size_t HeadEndIndex,
+ std::size_t... TailEndIndices, std::size_t... BoundIndices>
+struct MakeVisitationMatrix<ReturnType, FunctionObject,
+ index_sequence<HeadEndIndex, TailEndIndices...>,
+ index_sequence<BoundIndices...>>
+ : MakeVisitationMatrixImpl<ReturnType, FunctionObject,
+ index_sequence<TailEndIndices...>,
+ absl::make_index_sequence<HeadEndIndex>,
+ index_sequence<BoundIndices...>> {};
+
+struct UnreachableSwitchCase {
+ template <class Op>
+ [[noreturn]] static VisitIndicesResultT<Op, std::size_t> Run(
+ Op&& /*ignored*/) {
+#if ABSL_HAVE_BUILTIN(__builtin_unreachable) || \
+ (defined(__GNUC__) && !defined(__clang__))
+ __builtin_unreachable();
+#elif defined(_MSC_VER)
+ __assume(false);
+#else
+ // Try to use assert of false being identified as an unreachable intrinsic.
+ // NOTE: We use assert directly to increase chances of exploiting an assume
+ // intrinsic.
+ assert(false); // NOLINT
+
+ // Hack to silence potential no return warning -- cause an infinite loop.
+ return Run(absl::forward<Op>(op));
+#endif // Checks for __builtin_unreachable
+ }
+};
+
+template <class Op, std::size_t I>
+struct ReachableSwitchCase {
+ static VisitIndicesResultT<Op, std::size_t> Run(Op&& op) {
+ return absl::base_internal::invoke(absl::forward<Op>(op), SizeT<I>());
+ }
+};
+
+// The number 33 is just a guess at a reasonable maximum to our switch. It is
+// not based on any analysis. The reason it is a power of 2 plus 1 instead of a
+// power of 2 is because the number was picked to correspond to a power of 2
+// amount of "normal" alternatives, plus one for the possibility of the user
+// providing "monostate" in addition to the more natural alternatives.
+ABSL_INTERNAL_INLINE_CONSTEXPR(std::size_t, MaxUnrolledVisitCases, 33);
+
+// Note: The default-definition is for unreachable cases.
+template <bool IsReachable>
+struct PickCaseImpl {
+ template <class Op, std::size_t I>
+ using Apply = UnreachableSwitchCase;
+};
+
+template <>
+struct PickCaseImpl</*IsReachable =*/true> {
+ template <class Op, std::size_t I>
+ using Apply = ReachableSwitchCase<Op, I>;
+};
+
+// Note: This form of dance with template aliases is to make sure that we
+// instantiate a number of templates proportional to the number of variant
+// alternatives rather than a number of templates proportional to our
+// maximum unrolled amount of visitation cases (aliases are effectively
+// "free" whereas other template instantiations are costly).
+template <class Op, std::size_t I, std::size_t EndIndex>
+using PickCase = typename PickCaseImpl<(I < EndIndex)>::template Apply<Op, I>;
+
+template <class ReturnType>
+[[noreturn]] ReturnType TypedThrowBadVariantAccess() {
+ absl::variant_internal::ThrowBadVariantAccess();
+}
+
+// Given N variant sizes, determine the number of cases there would need to be
+// in a single switch-statement that would cover every possibility in the
+// corresponding N-ary visit operation.
+template <std::size_t... NumAlternatives>
+struct NumCasesOfSwitch;
+
+template <std::size_t HeadNumAlternatives, std::size_t... TailNumAlternatives>
+struct NumCasesOfSwitch<HeadNumAlternatives, TailNumAlternatives...> {
+ static constexpr std::size_t value =
+ (HeadNumAlternatives + 1) *
+ NumCasesOfSwitch<TailNumAlternatives...>::value;
+};
+
+template <>
+struct NumCasesOfSwitch<> {
+ static constexpr std::size_t value = 1;
+};
+
+// A switch statement optimizes better than the table of function pointers.
+template <std::size_t EndIndex>
+struct VisitIndicesSwitch {
+ static_assert(EndIndex <= MaxUnrolledVisitCases,
+ "Maximum unrolled switch size exceeded.");
+
+ template <class Op>
+ static VisitIndicesResultT<Op, std::size_t> Run(Op&& op, std::size_t i) {
+ switch (i) {
+ case 0:
+ return PickCase<Op, 0, EndIndex>::Run(absl::forward<Op>(op));
+ case 1:
+ return PickCase<Op, 1, EndIndex>::Run(absl::forward<Op>(op));
+ case 2:
+ return PickCase<Op, 2, EndIndex>::Run(absl::forward<Op>(op));
+ case 3:
+ return PickCase<Op, 3, EndIndex>::Run(absl::forward<Op>(op));
+ case 4:
+ return PickCase<Op, 4, EndIndex>::Run(absl::forward<Op>(op));
+ case 5:
+ return PickCase<Op, 5, EndIndex>::Run(absl::forward<Op>(op));
+ case 6:
+ return PickCase<Op, 6, EndIndex>::Run(absl::forward<Op>(op));
+ case 7:
+ return PickCase<Op, 7, EndIndex>::Run(absl::forward<Op>(op));
+ case 8:
+ return PickCase<Op, 8, EndIndex>::Run(absl::forward<Op>(op));
+ case 9:
+ return PickCase<Op, 9, EndIndex>::Run(absl::forward<Op>(op));
+ case 10:
+ return PickCase<Op, 10, EndIndex>::Run(absl::forward<Op>(op));
+ case 11:
+ return PickCase<Op, 11, EndIndex>::Run(absl::forward<Op>(op));
+ case 12:
+ return PickCase<Op, 12, EndIndex>::Run(absl::forward<Op>(op));
+ case 13:
+ return PickCase<Op, 13, EndIndex>::Run(absl::forward<Op>(op));
+ case 14:
+ return PickCase<Op, 14, EndIndex>::Run(absl::forward<Op>(op));
+ case 15:
+ return PickCase<Op, 15, EndIndex>::Run(absl::forward<Op>(op));
+ case 16:
+ return PickCase<Op, 16, EndIndex>::Run(absl::forward<Op>(op));
+ case 17:
+ return PickCase<Op, 17, EndIndex>::Run(absl::forward<Op>(op));
+ case 18:
+ return PickCase<Op, 18, EndIndex>::Run(absl::forward<Op>(op));
+ case 19:
+ return PickCase<Op, 19, EndIndex>::Run(absl::forward<Op>(op));
+ case 20:
+ return PickCase<Op, 20, EndIndex>::Run(absl::forward<Op>(op));
+ case 21:
+ return PickCase<Op, 21, EndIndex>::Run(absl::forward<Op>(op));
+ case 22:
+ return PickCase<Op, 22, EndIndex>::Run(absl::forward<Op>(op));
+ case 23:
+ return PickCase<Op, 23, EndIndex>::Run(absl::forward<Op>(op));
+ case 24:
+ return PickCase<Op, 24, EndIndex>::Run(absl::forward<Op>(op));
+ case 25:
+ return PickCase<Op, 25, EndIndex>::Run(absl::forward<Op>(op));
+ case 26:
+ return PickCase<Op, 26, EndIndex>::Run(absl::forward<Op>(op));
+ case 27:
+ return PickCase<Op, 27, EndIndex>::Run(absl::forward<Op>(op));
+ case 28:
+ return PickCase<Op, 28, EndIndex>::Run(absl::forward<Op>(op));
+ case 29:
+ return PickCase<Op, 29, EndIndex>::Run(absl::forward<Op>(op));
+ case 30:
+ return PickCase<Op, 30, EndIndex>::Run(absl::forward<Op>(op));
+ case 31:
+ return PickCase<Op, 31, EndIndex>::Run(absl::forward<Op>(op));
+ case 32:
+ return PickCase<Op, 32, EndIndex>::Run(absl::forward<Op>(op));
+ default:
+ ABSL_ASSERT(i == variant_npos);
+ return absl::base_internal::invoke(absl::forward<Op>(op), NPos());
+ }
+ }
+};
+
+template <std::size_t... EndIndices>
+struct VisitIndicesFallback {
+ template <class Op, class... SizeT>
+ static VisitIndicesResultT<Op, SizeT...> Run(Op&& op, SizeT... indices) {
+ return AccessSimpleArray(
+ MakeVisitationMatrix<VisitIndicesResultT<Op, SizeT...>, Op,
+ index_sequence<(EndIndices + 1)...>,
+ index_sequence<>>::Run(),
+ (indices + 1)...)(absl::forward<Op>(op));
+ }
+};
+
+// Take an N-dimensional series of indices and convert them into a single index
+// without loss of information. The purpose of this is to be able to convert an
+// N-ary visit operation into a single switch statement.
+template <std::size_t...>
+struct FlattenIndices;
+
+template <std::size_t HeadSize, std::size_t... TailSize>
+struct FlattenIndices<HeadSize, TailSize...> {
+ template<class... SizeType>
+ static constexpr std::size_t Run(std::size_t head, SizeType... tail) {
+ return head + HeadSize * FlattenIndices<TailSize...>::Run(tail...);
+ }
+};
+
+template <>
+struct FlattenIndices<> {
+ static constexpr std::size_t Run() { return 0; }
+};
+
+// Take a single "flattened" index (flattened by FlattenIndices) and determine
+// the value of the index of one of the logically represented dimensions.
+template <std::size_t I, std::size_t IndexToGet, std::size_t HeadSize,
+ std::size_t... TailSize>
+struct UnflattenIndex {
+ static constexpr std::size_t value =
+ UnflattenIndex<I / HeadSize, IndexToGet - 1, TailSize...>::value;
+};
+
+template <std::size_t I, std::size_t HeadSize, std::size_t... TailSize>
+struct UnflattenIndex<I, 0, HeadSize, TailSize...> {
+ static constexpr std::size_t value = (I % HeadSize);
+};
+
+// The backend for converting an N-ary visit operation into a unary visit.
+template <class IndexSequence, std::size_t... EndIndices>
+struct VisitIndicesVariadicImpl;
+
+template <std::size_t... N, std::size_t... EndIndices>
+struct VisitIndicesVariadicImpl<absl::index_sequence<N...>, EndIndices...> {
+ // A type that can take an N-ary function object and converts it to a unary
+ // function object that takes a single, flattened index, and "unflattens" it
+ // into its individual dimensions when forwarding to the wrapped object.
+ template <class Op>
+ struct FlattenedOp {
+ template <std::size_t I>
+ VisitIndicesResultT<Op, decltype(EndIndices)...> operator()(
+ SizeT<I> /*index*/) && {
+ return base_internal::invoke(
+ absl::forward<Op>(op),
+ SizeT<UnflattenIndex<I, N, (EndIndices + 1)...>::value -
+ std::size_t{1}>()...);
+ }
+
+ Op&& op;
+ };
+
+ template <class Op, class... SizeType>
+ static VisitIndicesResultT<Op, decltype(EndIndices)...> Run(
+ Op&& op, SizeType... i) {
+ return VisitIndicesSwitch<NumCasesOfSwitch<EndIndices...>::value>::Run(
+ FlattenedOp<Op>{absl::forward<Op>(op)},
+ FlattenIndices<(EndIndices + std::size_t{1})...>::Run(
+ (i + std::size_t{1})...));
+ }
+};
+
+template <std::size_t... EndIndices>
+struct VisitIndicesVariadic
+ : VisitIndicesVariadicImpl<absl::make_index_sequence<sizeof...(EndIndices)>,
+ EndIndices...> {};
+
+// This implementation will flatten N-ary visit operations into a single switch
+// statement when the number of cases would be less than our maximum specified
+// switch-statement size.
+// TODO(calabrese)
+// Based on benchmarks, determine whether the function table approach actually
+// does optimize better than a chain of switch statements and possibly update
+// the implementation accordingly. Also consider increasing the maximum switch
+// size.
+template <std::size_t... EndIndices>
+struct VisitIndices
+ : absl::conditional_t<(NumCasesOfSwitch<EndIndices...>::value <=
+ MaxUnrolledVisitCases),
+ VisitIndicesVariadic<EndIndices...>,
+ VisitIndicesFallback<EndIndices...>> {};
+
+template <std::size_t EndIndex>
+struct VisitIndices<EndIndex>
+ : absl::conditional_t<(EndIndex <= MaxUnrolledVisitCases),
+ VisitIndicesSwitch<EndIndex>,
+ VisitIndicesFallback<EndIndex>> {};
+
+// Suppress bogus warning on MSVC: MSVC complains that the `reinterpret_cast`
+// below is returning the address of a temporary or local object.
+#ifdef _MSC_VER
+#pragma warning(push)
+#pragma warning(disable : 4172)
+#endif // _MSC_VER
+
+// TODO(calabrese) std::launder
+// TODO(calabrese) constexpr
+// NOTE: DO NOT REMOVE the `inline` keyword as it is necessary to work around a
+// MSVC bug. See https://github.com/abseil/abseil-cpp/issues/129 for details.
+template <class Self, std::size_t I>
+inline VariantAccessResult<I, Self> AccessUnion(Self&& self, SizeT<I> /*i*/) {
+ return reinterpret_cast<VariantAccessResult<I, Self>>(self);
+}
+
+#ifdef _MSC_VER
+#pragma warning(pop)
+#endif // _MSC_VER
+
+template <class T>
+void DeducedDestroy(T& self) { // NOLINT
+ self.~T();
+}
+
+// NOTE: This type exists as a single entity for variant and its bases to
+// befriend. It contains helper functionality that manipulates the state of the
+// variant, such as the implementation of things like assignment and emplace
+// operations.
+struct VariantCoreAccess {
+ template <class VariantType>
+ static typename VariantType::Variant& Derived(VariantType& self) { // NOLINT
+ return static_cast<typename VariantType::Variant&>(self);
+ }
+
+ template <class VariantType>
+ static const typename VariantType::Variant& Derived(
+ const VariantType& self) { // NOLINT
+ return static_cast<const typename VariantType::Variant&>(self);
+ }
+
+ template <class VariantType>
+ static void Destroy(VariantType& self) { // NOLINT
+ Derived(self).destroy();
+ self.index_ = absl::variant_npos;
+ }
+
+ template <class Variant>
+ static void SetIndex(Variant& self, std::size_t i) { // NOLINT
+ self.index_ = i;
+ }
+
+ template <class Variant>
+ static void InitFrom(Variant& self, Variant&& other) { // NOLINT
+ VisitIndices<absl::variant_size<Variant>::value>::Run(
+ InitFromVisitor<Variant, Variant&&>{&self,
+ std::forward<Variant>(other)},
+ other.index());
+ self.index_ = other.index();
+ }
+
+ // Access a variant alternative, assuming the index is correct.
+ template <std::size_t I, class Variant>
+ static VariantAccessResult<I, Variant> Access(Variant&& self) {
+ // This cast instead of invocation of AccessUnion with an rvalue is a
+ // workaround for msvc. Without this there is a runtime failure when dealing
+ // with rvalues.
+ // TODO(calabrese) Reduce test case and find a simpler workaround.
+ return static_cast<VariantAccessResult<I, Variant>>(
+ variant_internal::AccessUnion(self.state_, SizeT<I>()));
+ }
+
+ // Access a variant alternative, throwing if the index is incorrect.
+ template <std::size_t I, class Variant>
+ static VariantAccessResult<I, Variant> CheckedAccess(Variant&& self) {
+ if (ABSL_PREDICT_FALSE(self.index_ != I)) {
+ TypedThrowBadVariantAccess<VariantAccessResult<I, Variant>>();
+ }
+
+ return Access<I>(absl::forward<Variant>(self));
+ }
+
+ // The implementation of the move-assignment operation for a variant.
+ template <class VType>
+ struct MoveAssignVisitor {
+ using DerivedType = typename VType::Variant;
+ template <std::size_t NewIndex>
+ void operator()(SizeT<NewIndex> /*new_i*/) const {
+ if (left->index_ == NewIndex) {
+ Access<NewIndex>(*left) = std::move(Access<NewIndex>(*right));
+ } else {
+ Derived(*left).template emplace<NewIndex>(
+ std::move(Access<NewIndex>(*right)));
+ }
+ }
+
+ void operator()(SizeT<absl::variant_npos> /*new_i*/) const {
+ Destroy(*left);
+ }
+
+ VType* left;
+ VType* right;
+ };
+
+ template <class VType>
+ static MoveAssignVisitor<VType> MakeMoveAssignVisitor(VType* left,
+ VType* other) {
+ return {left, other};
+ }
+
+ // The implementation of the assignment operation for a variant.
+ template <class VType>
+ struct CopyAssignVisitor {
+ using DerivedType = typename VType::Variant;
+ template <std::size_t NewIndex>
+ void operator()(SizeT<NewIndex> /*new_i*/) const {
+ using New =
+ typename absl::variant_alternative<NewIndex, DerivedType>::type;
+
+ if (left->index_ == NewIndex) {
+ Access<NewIndex>(*left) = Access<NewIndex>(*right);
+ } else if (std::is_nothrow_copy_constructible<New>::value ||
+ !std::is_nothrow_move_constructible<New>::value) {
+ Derived(*left).template emplace<NewIndex>(Access<NewIndex>(*right));
+ } else {
+ Derived(*left) = DerivedType(Derived(*right));
+ }
+ }
+
+ void operator()(SizeT<absl::variant_npos> /*new_i*/) const {
+ Destroy(*left);
+ }
+
+ VType* left;
+ const VType* right;
+ };
+
+ template <class VType>
+ static CopyAssignVisitor<VType> MakeCopyAssignVisitor(VType* left,
+ const VType& other) {
+ return {left, &other};
+ }
+
+ // The implementation of conversion-assignment operations for variant.
+ template <class Left, class QualifiedNew>
+ struct ConversionAssignVisitor {
+ using NewIndex =
+ variant_internal::IndexOfConstructedType<Left, QualifiedNew>;
+
+ void operator()(SizeT<NewIndex::value> /*old_i*/
+ ) const {
+ Access<NewIndex::value>(*left) = absl::forward<QualifiedNew>(other);
+ }
+
+ template <std::size_t OldIndex>
+ void operator()(SizeT<OldIndex> /*old_i*/
+ ) const {
+ using New =
+ typename absl::variant_alternative<NewIndex::value, Left>::type;
+ if (std::is_nothrow_constructible<New, QualifiedNew>::value ||
+ !std::is_nothrow_move_constructible<New>::value) {
+ left->template emplace<NewIndex::value>(
+ absl::forward<QualifiedNew>(other));
+ } else {
+ // the standard says "equivalent to
+ // operator=(variant(std::forward<T>(t)))", but we use `emplace` here
+ // because the variant's move assignment operator could be deleted.
+ left->template emplace<NewIndex::value>(
+ New(absl::forward<QualifiedNew>(other)));
+ }
+ }
+
+ Left* left;
+ QualifiedNew&& other;
+ };
+
+ template <class Left, class QualifiedNew>
+ static ConversionAssignVisitor<Left, QualifiedNew>
+ MakeConversionAssignVisitor(Left* left, QualifiedNew&& qual) {
+ return {left, absl::forward<QualifiedNew>(qual)};
+ }
+
+ // Backend for operations for `emplace()` which destructs `*self` then
+ // construct a new alternative with `Args...`.
+ template <std::size_t NewIndex, class Self, class... Args>
+ static typename absl::variant_alternative<NewIndex, Self>::type& Replace(
+ Self* self, Args&&... args) {
+ Destroy(*self);
+ using New = typename absl::variant_alternative<NewIndex, Self>::type;
+ New* const result = ::new (static_cast<void*>(&self->state_))
+ New(absl::forward<Args>(args)...);
+ self->index_ = NewIndex;
+ return *result;
+ }
+
+ template <class LeftVariant, class QualifiedRightVariant>
+ struct InitFromVisitor {
+ template <std::size_t NewIndex>
+ void operator()(SizeT<NewIndex> /*new_i*/) const {
+ using Alternative =
+ typename variant_alternative<NewIndex, LeftVariant>::type;
+ ::new (static_cast<void*>(&left->state_)) Alternative(
+ Access<NewIndex>(std::forward<QualifiedRightVariant>(right)));
+ }
+
+ void operator()(SizeT<absl::variant_npos> /*new_i*/) const {
+ // This space intentionally left blank.
+ }
+ LeftVariant* left;
+ QualifiedRightVariant&& right;
+ };
+};
+
+template <class Expected, class... T>
+struct IndexOfImpl;
+
+template <class Expected>
+struct IndexOfImpl<Expected> {
+ using IndexFromEnd = SizeT<0>;
+ using MatchedIndexFromEnd = IndexFromEnd;
+ using MultipleMatches = std::false_type;
+};
+
+template <class Expected, class Head, class... Tail>
+struct IndexOfImpl<Expected, Head, Tail...> : IndexOfImpl<Expected, Tail...> {
+ using IndexFromEnd =
+ SizeT<IndexOfImpl<Expected, Tail...>::IndexFromEnd::value + 1>;
+};
+
+template <class Expected, class... Tail>
+struct IndexOfImpl<Expected, Expected, Tail...>
+ : IndexOfImpl<Expected, Tail...> {
+ using IndexFromEnd =
+ SizeT<IndexOfImpl<Expected, Tail...>::IndexFromEnd::value + 1>;
+ using MatchedIndexFromEnd = IndexFromEnd;
+ using MultipleMatches = std::integral_constant<
+ bool, IndexOfImpl<Expected, Tail...>::MatchedIndexFromEnd::value != 0>;
+};
+
+template <class Expected, class... Types>
+struct IndexOfMeta {
+ using Results = IndexOfImpl<Expected, Types...>;
+ static_assert(!Results::MultipleMatches::value,
+ "Attempted to access a variant by specifying a type that "
+ "matches more than one alternative.");
+ static_assert(Results::MatchedIndexFromEnd::value != 0,
+ "Attempted to access a variant by specifying a type that does "
+ "not match any alternative.");
+ using type = SizeT<sizeof...(Types) - Results::MatchedIndexFromEnd::value>;
+};
+
+template <class Expected, class... Types>
+using IndexOf = typename IndexOfMeta<Expected, Types...>::type;
+
+template <class Variant, class T, std::size_t CurrIndex>
+struct UnambiguousIndexOfImpl;
+
+// Terminating case encountered once we've checked all of the alternatives
+template <class T, std::size_t CurrIndex>
+struct UnambiguousIndexOfImpl<variant<>, T, CurrIndex> : SizeT<CurrIndex> {};
+
+// Case where T is not Head
+template <class Head, class... Tail, class T, std::size_t CurrIndex>
+struct UnambiguousIndexOfImpl<variant<Head, Tail...>, T, CurrIndex>
+ : UnambiguousIndexOfImpl<variant<Tail...>, T, CurrIndex + 1>::type {};
+
+// Case where T is Head
+template <class Head, class... Tail, std::size_t CurrIndex>
+struct UnambiguousIndexOfImpl<variant<Head, Tail...>, Head, CurrIndex>
+ : SizeT<UnambiguousIndexOfImpl<variant<Tail...>, Head, 0>::value ==
+ sizeof...(Tail)
+ ? CurrIndex
+ : CurrIndex + sizeof...(Tail) + 1> {};
+
+template <class Variant, class T>
+struct UnambiguousIndexOf;
+
+struct NoMatch {
+ struct type {};
+};
+
+template <class... Alts, class T>
+struct UnambiguousIndexOf<variant<Alts...>, T>
+ : std::conditional<UnambiguousIndexOfImpl<variant<Alts...>, T, 0>::value !=
+ sizeof...(Alts),
+ UnambiguousIndexOfImpl<variant<Alts...>, T, 0>,
+ NoMatch>::type::type {};
+
+template <class T, std::size_t /*Dummy*/>
+using UnambiguousTypeOfImpl = T;
+
+template <class Variant, class T>
+using UnambiguousTypeOfT =
+ UnambiguousTypeOfImpl<T, UnambiguousIndexOf<Variant, T>::value>;
+
+template <class H, class... T>
+class VariantStateBase;
+
+// This is an implementation of the "imaginary function" that is described in
+// [variant.ctor]
+// It is used in order to determine which alternative to construct during
+// initialization from some type T.
+template <class Variant, std::size_t I = 0>
+struct ImaginaryFun;
+
+template <std::size_t I>
+struct ImaginaryFun<variant<>, I> {
+ static void Run() = delete;
+};
+
+template <class H, class... T, std::size_t I>
+struct ImaginaryFun<variant<H, T...>, I> : ImaginaryFun<variant<T...>, I + 1> {
+ using ImaginaryFun<variant<T...>, I + 1>::Run;
+
+ // NOTE: const& and && are used instead of by-value due to lack of guaranteed
+ // move elision of C++17. This may have other minor differences, but tests
+ // pass.
+ static SizeT<I> Run(const H&, SizeT<I>);
+ static SizeT<I> Run(H&&, SizeT<I>);
+};
+
+// The following metafunctions are used in constructor and assignment
+// constraints.
+template <class Self, class T>
+struct IsNeitherSelfNorInPlace : std::true_type {};
+
+template <class Self>
+struct IsNeitherSelfNorInPlace<Self, Self> : std::false_type {};
+
+template <class Self, class T>
+struct IsNeitherSelfNorInPlace<Self, in_place_type_t<T>> : std::false_type {};
+
+template <class Self, std::size_t I>
+struct IsNeitherSelfNorInPlace<Self, in_place_index_t<I>> : std::false_type {};
+
+template <class Variant, class T, class = void>
+struct ConversionIsPossibleImpl : std::false_type {};
+
+template <class Variant, class T>
+struct ConversionIsPossibleImpl<
+ Variant, T,
+ void_t<decltype(ImaginaryFun<Variant>::Run(std::declval<T>(), {}))>>
+ : std::true_type {};
+
+template <class Variant, class T>
+struct ConversionIsPossible : ConversionIsPossibleImpl<Variant, T>::type {};
+
+template <class Variant, class T>
+struct IndexOfConstructedType<
+ Variant, T,
+ void_t<decltype(ImaginaryFun<Variant>::Run(std::declval<T>(), {}))>>
+ : decltype(ImaginaryFun<Variant>::Run(std::declval<T>(), {})) {};
+
+template <std::size_t... Is>
+struct ContainsVariantNPos
+ : absl::negation<std::is_same< // NOLINT
+ absl::integer_sequence<bool, 0 <= Is...>,
+ absl::integer_sequence<bool, Is != absl::variant_npos...>>> {};
+
+template <class Op, class... QualifiedVariants>
+using RawVisitResult =
+ absl::result_of_t<Op(VariantAccessResult<0, QualifiedVariants>...)>;
+
+// NOTE: The spec requires that all return-paths yield the same type and is not
+// SFINAE-friendly, so we can deduce the return type by examining the first
+// result. If it's not callable, then we get an error, but are compliant and
+// fast to compile.
+// TODO(calabrese) Possibly rewrite in a way that yields better compile errors
+// at the cost of longer compile-times.
+template <class Op, class... QualifiedVariants>
+struct VisitResultImpl {
+ using type =
+ absl::result_of_t<Op(VariantAccessResult<0, QualifiedVariants>...)>;
+};
+
+// Done in two steps intentionally so that we don't cause substitution to fail.
+template <class Op, class... QualifiedVariants>
+using VisitResult = typename VisitResultImpl<Op, QualifiedVariants...>::type;
+
+template <class Op, class... QualifiedVariants>
+struct PerformVisitation {
+ using ReturnType = VisitResult<Op, QualifiedVariants...>;
+
+ template <std::size_t... Is>
+ constexpr ReturnType operator()(SizeT<Is>... indices) const {
+ return Run(typename ContainsVariantNPos<Is...>::type{},
+ absl::index_sequence_for<QualifiedVariants...>(), indices...);
+ }
+
+ template <std::size_t... TupIs, std::size_t... Is>
+ constexpr ReturnType Run(std::false_type /*has_valueless*/,
+ index_sequence<TupIs...>, SizeT<Is>...) const {
+ static_assert(
+ std::is_same<ReturnType,
+ absl::result_of_t<Op(VariantAccessResult<
+ Is, QualifiedVariants>...)>>::value,
+ "All visitation overloads must have the same return type.");
+ return absl::base_internal::invoke(
+ absl::forward<Op>(op),
+ VariantCoreAccess::Access<Is>(
+ absl::forward<QualifiedVariants>(std::get<TupIs>(variant_tup)))...);
+ }
+
+ template <std::size_t... TupIs, std::size_t... Is>
+ [[noreturn]] ReturnType Run(std::true_type /*has_valueless*/,
+ index_sequence<TupIs...>, SizeT<Is>...) const {
+ absl::variant_internal::ThrowBadVariantAccess();
+ }
+
+ // TODO(calabrese) Avoid using a tuple, which causes lots of instantiations
+ // Attempts using lambda variadic captures fail on current GCC.
+ std::tuple<QualifiedVariants&&...> variant_tup;
+ Op&& op;
+};
+
+template <class... T>
+union Union;
+
+// We want to allow for variant<> to be trivial. For that, we need the default
+// constructor to be trivial, which means we can't define it ourselves.
+// Instead, we use a non-default constructor that takes NoopConstructorTag
+// that doesn't affect the triviality of the types.
+struct NoopConstructorTag {};
+
+template <std::size_t I>
+struct EmplaceTag {};
+
+template <>
+union Union<> {
+ constexpr explicit Union(NoopConstructorTag) noexcept {}
+};
+
+// Suppress bogus warning on MSVC: MSVC complains that Union<T...> has a defined
+// deleted destructor from the `std::is_destructible` check below.
+#ifdef _MSC_VER
+#pragma warning(push)
+#pragma warning(disable : 4624)
+#endif // _MSC_VER
+
+template <class Head, class... Tail>
+union Union<Head, Tail...> {
+ using TailUnion = Union<Tail...>;
+
+ explicit constexpr Union(NoopConstructorTag /*tag*/) noexcept
+ : tail(NoopConstructorTag()) {}
+
+ template <class... P>
+ explicit constexpr Union(EmplaceTag<0>, P&&... args)
+ : head(absl::forward<P>(args)...) {}
+
+ template <std::size_t I, class... P>
+ explicit constexpr Union(EmplaceTag<I>, P&&... args)
+ : tail(EmplaceTag<I - 1>{}, absl::forward<P>(args)...) {}
+
+ Head head;
+ TailUnion tail;
+};
+
+#ifdef _MSC_VER
+#pragma warning(pop)
+#endif // _MSC_VER
+
+// TODO(calabrese) Just contain a Union in this union (certain configs fail).
+template <class... T>
+union DestructibleUnionImpl;
+
+template <>
+union DestructibleUnionImpl<> {
+ constexpr explicit DestructibleUnionImpl(NoopConstructorTag) noexcept {}
+};
+
+template <class Head, class... Tail>
+union DestructibleUnionImpl<Head, Tail...> {
+ using TailUnion = DestructibleUnionImpl<Tail...>;
+
+ explicit constexpr DestructibleUnionImpl(NoopConstructorTag /*tag*/) noexcept
+ : tail(NoopConstructorTag()) {}
+
+ template <class... P>
+ explicit constexpr DestructibleUnionImpl(EmplaceTag<0>, P&&... args)
+ : head(absl::forward<P>(args)...) {}
+
+ template <std::size_t I, class... P>
+ explicit constexpr DestructibleUnionImpl(EmplaceTag<I>, P&&... args)
+ : tail(EmplaceTag<I - 1>{}, absl::forward<P>(args)...) {}
+
+ ~DestructibleUnionImpl() {}
+
+ Head head;
+ TailUnion tail;
+};
+
+// This union type is destructible even if one or more T are not trivially
+// destructible. In the case that all T are trivially destructible, then so is
+// this resultant type.
+template <class... T>
+using DestructibleUnion =
+ absl::conditional_t<std::is_destructible<Union<T...>>::value, Union<T...>,
+ DestructibleUnionImpl<T...>>;
+
+// Deepest base, containing the actual union and the discriminator
+template <class H, class... T>
+class VariantStateBase {
+ protected:
+ using Variant = variant<H, T...>;
+
+ template <class LazyH = H,
+ class ConstructibleH = absl::enable_if_t<
+ std::is_default_constructible<LazyH>::value, LazyH>>
+ constexpr VariantStateBase() noexcept(
+ std::is_nothrow_default_constructible<ConstructibleH>::value)
+ : state_(EmplaceTag<0>()), index_(0) {}
+
+ template <std::size_t I, class... P>
+ explicit constexpr VariantStateBase(EmplaceTag<I> tag, P&&... args)
+ : state_(tag, absl::forward<P>(args)...), index_(I) {}
+
+ explicit constexpr VariantStateBase(NoopConstructorTag)
+ : state_(NoopConstructorTag()), index_(variant_npos) {}
+
+ void destroy() {} // Does nothing (shadowed in child if non-trivial)
+
+ DestructibleUnion<H, T...> state_;
+ std::size_t index_;
+};
+
+using absl::internal::identity;
+
+// OverloadSet::Overload() is a unary function which is overloaded to
+// take any of the element types of the variant, by reference-to-const.
+// The return type of the overload on T is identity<T>, so that you
+// can statically determine which overload was called.
+//
+// Overload() is not defined, so it can only be called in unevaluated
+// contexts.
+template <typename... Ts>
+struct OverloadSet;
+
+template <typename T, typename... Ts>
+struct OverloadSet<T, Ts...> : OverloadSet<Ts...> {
+ using Base = OverloadSet<Ts...>;
+ static identity<T> Overload(const T&);
+ using Base::Overload;
+};
+
+template <>
+struct OverloadSet<> {
+ // For any case not handled above.
+ static void Overload(...);
+};
+
+template <class T>
+using LessThanResult = decltype(std::declval<T>() < std::declval<T>());
+
+template <class T>
+using GreaterThanResult = decltype(std::declval<T>() > std::declval<T>());
+
+template <class T>
+using LessThanOrEqualResult = decltype(std::declval<T>() <= std::declval<T>());
+
+template <class T>
+using GreaterThanOrEqualResult =
+ decltype(std::declval<T>() >= std::declval<T>());
+
+template <class T>
+using EqualResult = decltype(std::declval<T>() == std::declval<T>());
+
+template <class T>
+using NotEqualResult = decltype(std::declval<T>() != std::declval<T>());
+
+using type_traits_internal::is_detected_convertible;
+
+template <class... T>
+using RequireAllHaveEqualT = absl::enable_if_t<
+ absl::conjunction<is_detected_convertible<bool, EqualResult, T>...>::value,
+ bool>;
+
+template <class... T>
+using RequireAllHaveNotEqualT =
+ absl::enable_if_t<absl::conjunction<is_detected_convertible<
+ bool, NotEqualResult, T>...>::value,
+ bool>;
+
+template <class... T>
+using RequireAllHaveLessThanT =
+ absl::enable_if_t<absl::conjunction<is_detected_convertible<
+ bool, LessThanResult, T>...>::value,
+ bool>;
+
+template <class... T>
+using RequireAllHaveLessThanOrEqualT =
+ absl::enable_if_t<absl::conjunction<is_detected_convertible<
+ bool, LessThanOrEqualResult, T>...>::value,
+ bool>;
+
+template <class... T>
+using RequireAllHaveGreaterThanOrEqualT =
+ absl::enable_if_t<absl::conjunction<is_detected_convertible<
+ bool, GreaterThanOrEqualResult, T>...>::value,
+ bool>;
+
+template <class... T>
+using RequireAllHaveGreaterThanT =
+ absl::enable_if_t<absl::conjunction<is_detected_convertible<
+ bool, GreaterThanResult, T>...>::value,
+ bool>;
+
+// Helper template containing implementations details of variant that can't go
+// in the private section. For convenience, this takes the variant type as a
+// single template parameter.
+template <typename T>
+struct VariantHelper;
+
+template <typename... Ts>
+struct VariantHelper<variant<Ts...>> {
+ // Type metafunction which returns the element type selected if
+ // OverloadSet::Overload() is well-formed when called with argument type U.
+ template <typename U>
+ using BestMatch = decltype(
+ variant_internal::OverloadSet<Ts...>::Overload(std::declval<U>()));
+
+ // Type metafunction which returns true if OverloadSet::Overload() is
+ // well-formed when called with argument type U.
+ // CanAccept can't be just an alias because there is a MSVC bug on parameter
+ // pack expansion involving decltype.
+ template <typename U>
+ struct CanAccept :
+ std::integral_constant<bool, !std::is_void<BestMatch<U>>::value> {};
+
+ // Type metafunction which returns true if Other is an instantiation of
+ // variant, and variants's converting constructor from Other will be
+ // well-formed. We will use this to remove constructors that would be
+ // ill-formed from the overload set.
+ template <typename Other>
+ struct CanConvertFrom;
+
+ template <typename... Us>
+ struct CanConvertFrom<variant<Us...>>
+ : public absl::conjunction<CanAccept<Us>...> {};
+};
+
+// A type with nontrivial copy ctor and trivial move ctor.
+struct TrivialMoveOnly {
+ TrivialMoveOnly(TrivialMoveOnly&&) = default;
+};
+
+// Trait class to detect whether a type is trivially move constructible.
+// A union's defaulted copy/move constructor is deleted if any variant member's
+// copy/move constructor is nontrivial.
+template <typename T>
+struct IsTriviallyMoveConstructible:
+ std::is_move_constructible<Union<T, TrivialMoveOnly>> {};
+
+// To guarantee triviality of all special-member functions that can be trivial,
+// we use a chain of conditional bases for each one.
+// The order of inheritance of bases from child to base are logically:
+//
+// variant
+// VariantCopyAssignBase
+// VariantMoveAssignBase
+// VariantCopyBase
+// VariantMoveBase
+// VariantStateBaseDestructor
+// VariantStateBase
+//
+// Note that there is a separate branch at each base that is dependent on
+// whether or not that corresponding special-member-function can be trivial in
+// the resultant variant type.
+
+template <class... T>
+class VariantStateBaseDestructorNontrivial;
+
+template <class... T>
+class VariantMoveBaseNontrivial;
+
+template <class... T>
+class VariantCopyBaseNontrivial;
+
+template <class... T>
+class VariantMoveAssignBaseNontrivial;
+
+template <class... T>
+class VariantCopyAssignBaseNontrivial;
+
+// Base that is dependent on whether or not the destructor can be trivial.
+template <class... T>
+using VariantStateBaseDestructor =
+ absl::conditional_t<std::is_destructible<Union<T...>>::value,
+ VariantStateBase<T...>,
+ VariantStateBaseDestructorNontrivial<T...>>;
+
+// Base that is dependent on whether or not the move-constructor can be
+// implicitly generated by the compiler (trivial or deleted).
+// Previously we were using `std::is_move_constructible<Union<T...>>` to check
+// whether all Ts have trivial move constructor, but it ran into a GCC bug:
+// https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84866
+// So we have to use a different approach (i.e. `HasTrivialMoveConstructor`) to
+// work around the bug.
+template <class... T>
+using VariantMoveBase = absl::conditional_t<
+ absl::disjunction<
+ absl::negation<absl::conjunction<std::is_move_constructible<T>...>>,
+ absl::conjunction<IsTriviallyMoveConstructible<T>...>>::value,
+ VariantStateBaseDestructor<T...>, VariantMoveBaseNontrivial<T...>>;
+
+// Base that is dependent on whether or not the copy-constructor can be trivial.
+template <class... T>
+using VariantCopyBase = absl::conditional_t<
+ absl::disjunction<
+ absl::negation<absl::conjunction<std::is_copy_constructible<T>...>>,
+ std::is_copy_constructible<Union<T...>>>::value,
+ VariantMoveBase<T...>, VariantCopyBaseNontrivial<T...>>;
+
+// Base that is dependent on whether or not the move-assign can be trivial.
+template <class... T>
+using VariantMoveAssignBase = absl::conditional_t<
+ absl::disjunction<
+ absl::conjunction<absl::is_move_assignable<Union<T...>>,
+ std::is_move_constructible<Union<T...>>,
+ std::is_destructible<Union<T...>>>,
+ absl::negation<absl::conjunction<std::is_move_constructible<T>...,
+ // Note: We're not qualifying this with
+ // absl:: because it doesn't compile
+ // under MSVC.
+ is_move_assignable<T>...>>>::value,
+ VariantCopyBase<T...>, VariantMoveAssignBaseNontrivial<T...>>;
+
+// Base that is dependent on whether or not the copy-assign can be trivial.
+template <class... T>
+using VariantCopyAssignBase = absl::conditional_t<
+ absl::disjunction<
+ absl::conjunction<absl::is_copy_assignable<Union<T...>>,
+ std::is_copy_constructible<Union<T...>>,
+ std::is_destructible<Union<T...>>>,
+ absl::negation<absl::conjunction<std::is_copy_constructible<T>...,
+ // Note: We're not qualifying this with
+ // absl:: because it doesn't compile
+ // under MSVC.
+ is_copy_assignable<T>...>>>::value,
+ VariantMoveAssignBase<T...>, VariantCopyAssignBaseNontrivial<T...>>;
+
+template <class... T>
+using VariantBase = VariantCopyAssignBase<T...>;
+
+template <class... T>
+class VariantStateBaseDestructorNontrivial : protected VariantStateBase<T...> {
+ private:
+ using Base = VariantStateBase<T...>;
+
+ protected:
+ using Base::Base;
+
+ VariantStateBaseDestructorNontrivial() = default;
+ VariantStateBaseDestructorNontrivial(VariantStateBaseDestructorNontrivial&&) =
+ default;
+ VariantStateBaseDestructorNontrivial(
+ const VariantStateBaseDestructorNontrivial&) = default;
+ VariantStateBaseDestructorNontrivial& operator=(
+ VariantStateBaseDestructorNontrivial&&) = default;
+ VariantStateBaseDestructorNontrivial& operator=(
+ const VariantStateBaseDestructorNontrivial&) = default;
+
+ struct Destroyer {
+ template <std::size_t I>
+ void operator()(SizeT<I> i) const {
+ using Alternative =
+ typename absl::variant_alternative<I, variant<T...>>::type;
+ variant_internal::AccessUnion(self->state_, i).~Alternative();
+ }
+
+ void operator()(SizeT<absl::variant_npos> /*i*/) const {
+ // This space intentionally left blank
+ }
+
+ VariantStateBaseDestructorNontrivial* self;
+ };
+
+ void destroy() { VisitIndices<sizeof...(T)>::Run(Destroyer{this}, index_); }
+
+ ~VariantStateBaseDestructorNontrivial() { destroy(); }
+
+ protected:
+ using Base::index_;
+ using Base::state_;
+};
+
+template <class... T>
+class VariantMoveBaseNontrivial : protected VariantStateBaseDestructor<T...> {
+ private:
+ using Base = VariantStateBaseDestructor<T...>;
+
+ protected:
+ using Base::Base;
+
+ struct Construct {
+ template <std::size_t I>
+ void operator()(SizeT<I> i) const {
+ using Alternative =
+ typename absl::variant_alternative<I, variant<T...>>::type;
+ ::new (static_cast<void*>(&self->state_)) Alternative(
+ variant_internal::AccessUnion(absl::move(other->state_), i));
+ }
+
+ void operator()(SizeT<absl::variant_npos> /*i*/) const {}
+
+ VariantMoveBaseNontrivial* self;
+ VariantMoveBaseNontrivial* other;
+ };
+
+ VariantMoveBaseNontrivial() = default;
+ VariantMoveBaseNontrivial(VariantMoveBaseNontrivial&& other) noexcept(
+ absl::conjunction<std::is_nothrow_move_constructible<T>...>::value)
+ : Base(NoopConstructorTag()) {
+ VisitIndices<sizeof...(T)>::Run(Construct{this, &other}, other.index_);
+ index_ = other.index_;
+ }
+
+ VariantMoveBaseNontrivial(VariantMoveBaseNontrivial const&) = default;
+
+ VariantMoveBaseNontrivial& operator=(VariantMoveBaseNontrivial&&) = default;
+ VariantMoveBaseNontrivial& operator=(VariantMoveBaseNontrivial const&) =
+ default;
+
+ protected:
+ using Base::index_;
+ using Base::state_;
+};
+
+template <class... T>
+class VariantCopyBaseNontrivial : protected VariantMoveBase<T...> {
+ private:
+ using Base = VariantMoveBase<T...>;
+
+ protected:
+ using Base::Base;
+
+ VariantCopyBaseNontrivial() = default;
+ VariantCopyBaseNontrivial(VariantCopyBaseNontrivial&&) = default;
+
+ struct Construct {
+ template <std::size_t I>
+ void operator()(SizeT<I> i) const {
+ using Alternative =
+ typename absl::variant_alternative<I, variant<T...>>::type;
+ ::new (static_cast<void*>(&self->state_))
+ Alternative(variant_internal::AccessUnion(other->state_, i));
+ }
+
+ void operator()(SizeT<absl::variant_npos> /*i*/) const {}
+
+ VariantCopyBaseNontrivial* self;
+ const VariantCopyBaseNontrivial* other;
+ };
+
+ VariantCopyBaseNontrivial(VariantCopyBaseNontrivial const& other)
+ : Base(NoopConstructorTag()) {
+ VisitIndices<sizeof...(T)>::Run(Construct{this, &other}, other.index_);
+ index_ = other.index_;
+ }
+
+ VariantCopyBaseNontrivial& operator=(VariantCopyBaseNontrivial&&) = default;
+ VariantCopyBaseNontrivial& operator=(VariantCopyBaseNontrivial const&) =
+ default;
+
+ protected:
+ using Base::index_;
+ using Base::state_;
+};
+
+template <class... T>
+class VariantMoveAssignBaseNontrivial : protected VariantCopyBase<T...> {
+ friend struct VariantCoreAccess;
+
+ private:
+ using Base = VariantCopyBase<T...>;
+
+ protected:
+ using Base::Base;
+
+ VariantMoveAssignBaseNontrivial() = default;
+ VariantMoveAssignBaseNontrivial(VariantMoveAssignBaseNontrivial&&) = default;
+ VariantMoveAssignBaseNontrivial(const VariantMoveAssignBaseNontrivial&) =
+ default;
+ VariantMoveAssignBaseNontrivial& operator=(
+ VariantMoveAssignBaseNontrivial const&) = default;
+
+ VariantMoveAssignBaseNontrivial&
+ operator=(VariantMoveAssignBaseNontrivial&& other) noexcept(
+ absl::conjunction<std::is_nothrow_move_constructible<T>...,
+ std::is_nothrow_move_assignable<T>...>::value) {
+ VisitIndices<sizeof...(T)>::Run(
+ VariantCoreAccess::MakeMoveAssignVisitor(this, &other), other.index_);
+ return *this;
+ }
+
+ protected:
+ using Base::index_;
+ using Base::state_;
+};
+
+template <class... T>
+class VariantCopyAssignBaseNontrivial : protected VariantMoveAssignBase<T...> {
+ friend struct VariantCoreAccess;
+
+ private:
+ using Base = VariantMoveAssignBase<T...>;
+
+ protected:
+ using Base::Base;
+
+ VariantCopyAssignBaseNontrivial() = default;
+ VariantCopyAssignBaseNontrivial(VariantCopyAssignBaseNontrivial&&) = default;
+ VariantCopyAssignBaseNontrivial(const VariantCopyAssignBaseNontrivial&) =
+ default;
+ VariantCopyAssignBaseNontrivial& operator=(
+ VariantCopyAssignBaseNontrivial&&) = default;
+
+ VariantCopyAssignBaseNontrivial& operator=(
+ const VariantCopyAssignBaseNontrivial& other) {
+ VisitIndices<sizeof...(T)>::Run(
+ VariantCoreAccess::MakeCopyAssignVisitor(this, other), other.index_);
+ return *this;
+ }
+
+ protected:
+ using Base::index_;
+ using Base::state_;
+};
+
+////////////////////////////////////////
+// Visitors for Comparison Operations //
+////////////////////////////////////////
+
+template <class... Types>
+struct EqualsOp {
+ const variant<Types...>* v;
+ const variant<Types...>* w;
+
+ constexpr bool operator()(SizeT<absl::variant_npos> /*v_i*/) const {
+ return true;
+ }
+
+ template <std::size_t I>
+ constexpr bool operator()(SizeT<I> /*v_i*/) const {
+ return VariantCoreAccess::Access<I>(*v) == VariantCoreAccess::Access<I>(*w);
+ }
+};
+
+template <class... Types>
+struct NotEqualsOp {
+ const variant<Types...>* v;
+ const variant<Types...>* w;
+
+ constexpr bool operator()(SizeT<absl::variant_npos> /*v_i*/) const {
+ return false;
+ }
+
+ template <std::size_t I>
+ constexpr bool operator()(SizeT<I> /*v_i*/) const {
+ return VariantCoreAccess::Access<I>(*v) != VariantCoreAccess::Access<I>(*w);
+ }
+};
+
+template <class... Types>
+struct LessThanOp {
+ const variant<Types...>* v;
+ const variant<Types...>* w;
+
+ constexpr bool operator()(SizeT<absl::variant_npos> /*v_i*/) const {
+ return false;
+ }
+
+ template <std::size_t I>
+ constexpr bool operator()(SizeT<I> /*v_i*/) const {
+ return VariantCoreAccess::Access<I>(*v) < VariantCoreAccess::Access<I>(*w);
+ }
+};
+
+template <class... Types>
+struct GreaterThanOp {
+ const variant<Types...>* v;
+ const variant<Types...>* w;
+
+ constexpr bool operator()(SizeT<absl::variant_npos> /*v_i*/) const {
+ return false;
+ }
+
+ template <std::size_t I>
+ constexpr bool operator()(SizeT<I> /*v_i*/) const {
+ return VariantCoreAccess::Access<I>(*v) > VariantCoreAccess::Access<I>(*w);
+ }
+};
+
+template <class... Types>
+struct LessThanOrEqualsOp {
+ const variant<Types...>* v;
+ const variant<Types...>* w;
+
+ constexpr bool operator()(SizeT<absl::variant_npos> /*v_i*/) const {
+ return true;
+ }
+
+ template <std::size_t I>
+ constexpr bool operator()(SizeT<I> /*v_i*/) const {
+ return VariantCoreAccess::Access<I>(*v) <= VariantCoreAccess::Access<I>(*w);
+ }
+};
+
+template <class... Types>
+struct GreaterThanOrEqualsOp {
+ const variant<Types...>* v;
+ const variant<Types...>* w;
+
+ constexpr bool operator()(SizeT<absl::variant_npos> /*v_i*/) const {
+ return true;
+ }
+
+ template <std::size_t I>
+ constexpr bool operator()(SizeT<I> /*v_i*/) const {
+ return VariantCoreAccess::Access<I>(*v) >= VariantCoreAccess::Access<I>(*w);
+ }
+};
+
+// Precondition: v.index() == w.index();
+template <class... Types>
+struct SwapSameIndex {
+ variant<Types...>* v;
+ variant<Types...>* w;
+ template <std::size_t I>
+ void operator()(SizeT<I>) const {
+ type_traits_internal::Swap(VariantCoreAccess::Access<I>(*v),
+ VariantCoreAccess::Access<I>(*w));
+ }
+
+ void operator()(SizeT<variant_npos>) const {}
+};
+
+// TODO(calabrese) do this from a different namespace for proper adl usage
+template <class... Types>
+struct Swap {
+ variant<Types...>* v;
+ variant<Types...>* w;
+
+ void generic_swap() const {
+ variant<Types...> tmp(std::move(*w));
+ VariantCoreAccess::Destroy(*w);
+ VariantCoreAccess::InitFrom(*w, std::move(*v));
+ VariantCoreAccess::Destroy(*v);
+ VariantCoreAccess::InitFrom(*v, std::move(tmp));
+ }
+
+ void operator()(SizeT<absl::variant_npos> /*w_i*/) const {
+ if (!v->valueless_by_exception()) {
+ generic_swap();
+ }
+ }
+
+ template <std::size_t Wi>
+ void operator()(SizeT<Wi> /*w_i*/) {
+ if (v->index() == Wi) {
+ VisitIndices<sizeof...(Types)>::Run(SwapSameIndex<Types...>{v, w}, Wi);
+ } else {
+ generic_swap();
+ }
+ }
+};
+
+template <typename Variant, typename = void, typename... Ts>
+struct VariantHashBase {
+ VariantHashBase() = delete;
+ VariantHashBase(const VariantHashBase&) = delete;
+ VariantHashBase(VariantHashBase&&) = delete;
+ VariantHashBase& operator=(const VariantHashBase&) = delete;
+ VariantHashBase& operator=(VariantHashBase&&) = delete;
+};
+
+struct VariantHashVisitor {
+ template <typename T>
+ size_t operator()(const T& t) {
+ return std::hash<T>{}(t);
+ }
+};
+
+template <typename Variant, typename... Ts>
+struct VariantHashBase<Variant,
+ absl::enable_if_t<absl::conjunction<
+ type_traits_internal::IsHashable<Ts>...>::value>,
+ Ts...> {
+ using argument_type = Variant;
+ using result_type = size_t;
+ size_t operator()(const Variant& var) const {
+ type_traits_internal::AssertHashEnabled<Ts...>();
+ if (var.valueless_by_exception()) {
+ return 239799884;
+ }
+ size_t result = VisitIndices<variant_size<Variant>::value>::Run(
+ PerformVisitation<VariantHashVisitor, const Variant&>{
+ std::forward_as_tuple(var), VariantHashVisitor{}},
+ var.index());
+ // Combine the index and the hash result in order to distinguish
+ // std::variant<int, int> holding the same value as different alternative.
+ return result ^ var.index();
+ }
+};
+
+} // namespace variant_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // !defined(ABSL_USES_STD_VARIANT)
+#endif // ABSL_TYPES_variant_internal_H_
diff --git a/third_party/abseil/src/absl/types/optional.h b/third_party/abseil/src/absl/types/optional.h
new file mode 100644
index 0000000..61540cf
--- /dev/null
+++ b/third_party/abseil/src/absl/types/optional.h
@@ -0,0 +1,776 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// optional.h
+// -----------------------------------------------------------------------------
+//
+// This header file defines the `absl::optional` type for holding a value which
+// may or may not be present. This type is useful for providing value semantics
+// for operations that may either wish to return or hold "something-or-nothing".
+//
+// Example:
+//
+// // A common way to signal operation failure is to provide an output
+// // parameter and a bool return type:
+// bool AcquireResource(const Input&, Resource * out);
+//
+// // Providing an absl::optional return type provides a cleaner API:
+// absl::optional<Resource> AcquireResource(const Input&);
+//
+// `absl::optional` is a C++11 compatible version of the C++17 `std::optional`
+// abstraction and is designed to be a drop-in replacement for code compliant
+// with C++17.
+#ifndef ABSL_TYPES_OPTIONAL_H_
+#define ABSL_TYPES_OPTIONAL_H_
+
+#include "absl/base/config.h" // TODO(calabrese) IWYU removal?
+#include "absl/utility/utility.h"
+
+#ifdef ABSL_USES_STD_OPTIONAL
+
+#include <optional> // IWYU pragma: export
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+using std::bad_optional_access;
+using std::optional;
+using std::make_optional;
+using std::nullopt_t;
+using std::nullopt;
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#else // ABSL_USES_STD_OPTIONAL
+
+#include <cassert>
+#include <functional>
+#include <initializer_list>
+#include <type_traits>
+#include <utility>
+
+#include "absl/base/attributes.h"
+#include "absl/base/internal/inline_variable.h"
+#include "absl/meta/type_traits.h"
+#include "absl/types/bad_optional_access.h"
+#include "absl/types/internal/optional.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+// nullopt_t
+//
+// Class type for `absl::nullopt` used to indicate an `absl::optional<T>` type
+// that does not contain a value.
+struct nullopt_t {
+ // It must not be default-constructible to avoid ambiguity for opt = {}.
+ explicit constexpr nullopt_t(optional_internal::init_t) noexcept {}
+};
+
+// nullopt
+//
+// A tag constant of type `absl::nullopt_t` used to indicate an empty
+// `absl::optional` in certain functions, such as construction or assignment.
+ABSL_INTERNAL_INLINE_CONSTEXPR(nullopt_t, nullopt,
+ nullopt_t(optional_internal::init_t()));
+
+// -----------------------------------------------------------------------------
+// absl::optional
+// -----------------------------------------------------------------------------
+//
+// A value of type `absl::optional<T>` holds either a value of `T` or an
+// "empty" value. When it holds a value of `T`, it stores it as a direct
+// sub-object, so `sizeof(optional<T>)` is approximately
+// `sizeof(T) + sizeof(bool)`.
+//
+// This implementation is based on the specification in the latest draft of the
+// C++17 `std::optional` specification as of May 2017, section 20.6.
+//
+// Differences between `absl::optional<T>` and `std::optional<T>` include:
+//
+// * `constexpr` is not used for non-const member functions.
+// (dependency on some differences between C++11 and C++14.)
+// * `absl::nullopt` and `absl::in_place` are not declared `constexpr`. We
+// need the inline variable support in C++17 for external linkage.
+// * Throws `absl::bad_optional_access` instead of
+// `std::bad_optional_access`.
+// * `make_optional()` cannot be declared `constexpr` due to the absence of
+// guaranteed copy elision.
+// * The move constructor's `noexcept` specification is stronger, i.e. if the
+// default allocator is non-throwing (via setting
+// `ABSL_ALLOCATOR_NOTHROW`), it evaluates to `noexcept(true)`, because
+// we assume
+// a) move constructors should only throw due to allocation failure and
+// b) if T's move constructor allocates, it uses the same allocation
+// function as the default allocator.
+//
+template <typename T>
+class optional : private optional_internal::optional_data<T>,
+ private optional_internal::optional_ctor_base<
+ optional_internal::ctor_copy_traits<T>::traits>,
+ private optional_internal::optional_assign_base<
+ optional_internal::assign_copy_traits<T>::traits> {
+ using data_base = optional_internal::optional_data<T>;
+
+ public:
+ typedef T value_type;
+
+ // Constructors
+
+ // Constructs an `optional` holding an empty value, NOT a default constructed
+ // `T`.
+ constexpr optional() noexcept {}
+
+ // Constructs an `optional` initialized with `nullopt` to hold an empty value.
+ constexpr optional(nullopt_t) noexcept {} // NOLINT(runtime/explicit)
+
+ // Copy constructor, standard semantics
+ optional(const optional&) = default;
+
+ // Move constructor, standard semantics
+ optional(optional&&) = default;
+
+ // Constructs a non-empty `optional` direct-initialized value of type `T` from
+ // the arguments `std::forward<Args>(args)...` within the `optional`.
+ // (The `in_place_t` is a tag used to indicate that the contained object
+ // should be constructed in-place.)
+ template <typename InPlaceT, typename... Args,
+ absl::enable_if_t<absl::conjunction<
+ std::is_same<InPlaceT, in_place_t>,
+ std::is_constructible<T, Args&&...> >::value>* = nullptr>
+ constexpr explicit optional(InPlaceT, Args&&... args)
+ : data_base(in_place_t(), absl::forward<Args>(args)...) {}
+
+ // Constructs a non-empty `optional` direct-initialized value of type `T` from
+ // the arguments of an initializer_list and `std::forward<Args>(args)...`.
+ // (The `in_place_t` is a tag used to indicate that the contained object
+ // should be constructed in-place.)
+ template <typename U, typename... Args,
+ typename = typename std::enable_if<std::is_constructible<
+ T, std::initializer_list<U>&, Args&&...>::value>::type>
+ constexpr explicit optional(in_place_t, std::initializer_list<U> il,
+ Args&&... args)
+ : data_base(in_place_t(), il, absl::forward<Args>(args)...) {
+ }
+
+ // Value constructor (implicit)
+ template <
+ typename U = T,
+ typename std::enable_if<
+ absl::conjunction<absl::negation<std::is_same<
+ in_place_t, typename std::decay<U>::type> >,
+ absl::negation<std::is_same<
+ optional<T>, typename std::decay<U>::type> >,
+ std::is_convertible<U&&, T>,
+ std::is_constructible<T, U&&> >::value,
+ bool>::type = false>
+ constexpr optional(U&& v) : data_base(in_place_t(), absl::forward<U>(v)) {}
+
+ // Value constructor (explicit)
+ template <
+ typename U = T,
+ typename std::enable_if<
+ absl::conjunction<absl::negation<std::is_same<
+ in_place_t, typename std::decay<U>::type>>,
+ absl::negation<std::is_same<
+ optional<T>, typename std::decay<U>::type>>,
+ absl::negation<std::is_convertible<U&&, T>>,
+ std::is_constructible<T, U&&>>::value,
+ bool>::type = false>
+ explicit constexpr optional(U&& v)
+ : data_base(in_place_t(), absl::forward<U>(v)) {}
+
+ // Converting copy constructor (implicit)
+ template <typename U,
+ typename std::enable_if<
+ absl::conjunction<
+ absl::negation<std::is_same<T, U> >,
+ std::is_constructible<T, const U&>,
+ absl::negation<
+ optional_internal::
+ is_constructible_convertible_from_optional<T, U> >,
+ std::is_convertible<const U&, T> >::value,
+ bool>::type = false>
+ optional(const optional<U>& rhs) {
+ if (rhs) {
+ this->construct(*rhs);
+ }
+ }
+
+ // Converting copy constructor (explicit)
+ template <typename U,
+ typename std::enable_if<
+ absl::conjunction<
+ absl::negation<std::is_same<T, U>>,
+ std::is_constructible<T, const U&>,
+ absl::negation<
+ optional_internal::
+ is_constructible_convertible_from_optional<T, U>>,
+ absl::negation<std::is_convertible<const U&, T>>>::value,
+ bool>::type = false>
+ explicit optional(const optional<U>& rhs) {
+ if (rhs) {
+ this->construct(*rhs);
+ }
+ }
+
+ // Converting move constructor (implicit)
+ template <typename U,
+ typename std::enable_if<
+ absl::conjunction<
+ absl::negation<std::is_same<T, U> >,
+ std::is_constructible<T, U&&>,
+ absl::negation<
+ optional_internal::
+ is_constructible_convertible_from_optional<T, U> >,
+ std::is_convertible<U&&, T> >::value,
+ bool>::type = false>
+ optional(optional<U>&& rhs) {
+ if (rhs) {
+ this->construct(std::move(*rhs));
+ }
+ }
+
+ // Converting move constructor (explicit)
+ template <
+ typename U,
+ typename std::enable_if<
+ absl::conjunction<
+ absl::negation<std::is_same<T, U>>, std::is_constructible<T, U&&>,
+ absl::negation<
+ optional_internal::is_constructible_convertible_from_optional<
+ T, U>>,
+ absl::negation<std::is_convertible<U&&, T>>>::value,
+ bool>::type = false>
+ explicit optional(optional<U>&& rhs) {
+ if (rhs) {
+ this->construct(std::move(*rhs));
+ }
+ }
+
+ // Destructor. Trivial if `T` is trivially destructible.
+ ~optional() = default;
+
+ // Assignment Operators
+
+ // Assignment from `nullopt`
+ //
+ // Example:
+ //
+ // struct S { int value; };
+ // optional<S> opt = absl::nullopt; // Could also use opt = { };
+ optional& operator=(nullopt_t) noexcept {
+ this->destruct();
+ return *this;
+ }
+
+ // Copy assignment operator, standard semantics
+ optional& operator=(const optional& src) = default;
+
+ // Move assignment operator, standard semantics
+ optional& operator=(optional&& src) = default;
+
+ // Value assignment operators
+ template <
+ typename U = T,
+ typename = typename std::enable_if<absl::conjunction<
+ absl::negation<
+ std::is_same<optional<T>, typename std::decay<U>::type>>,
+ absl::negation<
+ absl::conjunction<std::is_scalar<T>,
+ std::is_same<T, typename std::decay<U>::type>>>,
+ std::is_constructible<T, U>, std::is_assignable<T&, U>>::value>::type>
+ optional& operator=(U&& v) {
+ this->assign(std::forward<U>(v));
+ return *this;
+ }
+
+ template <
+ typename U,
+ typename = typename std::enable_if<absl::conjunction<
+ absl::negation<std::is_same<T, U>>,
+ std::is_constructible<T, const U&>, std::is_assignable<T&, const U&>,
+ absl::negation<
+ optional_internal::
+ is_constructible_convertible_assignable_from_optional<
+ T, U>>>::value>::type>
+ optional& operator=(const optional<U>& rhs) {
+ if (rhs) {
+ this->assign(*rhs);
+ } else {
+ this->destruct();
+ }
+ return *this;
+ }
+
+ template <typename U,
+ typename = typename std::enable_if<absl::conjunction<
+ absl::negation<std::is_same<T, U>>, std::is_constructible<T, U>,
+ std::is_assignable<T&, U>,
+ absl::negation<
+ optional_internal::
+ is_constructible_convertible_assignable_from_optional<
+ T, U>>>::value>::type>
+ optional& operator=(optional<U>&& rhs) {
+ if (rhs) {
+ this->assign(std::move(*rhs));
+ } else {
+ this->destruct();
+ }
+ return *this;
+ }
+
+ // Modifiers
+
+ // optional::reset()
+ //
+ // Destroys the inner `T` value of an `absl::optional` if one is present.
+ ABSL_ATTRIBUTE_REINITIALIZES void reset() noexcept { this->destruct(); }
+
+ // optional::emplace()
+ //
+ // (Re)constructs the underlying `T` in-place with the given forwarded
+ // arguments.
+ //
+ // Example:
+ //
+ // optional<Foo> opt;
+ // opt.emplace(arg1,arg2,arg3); // Constructs Foo(arg1,arg2,arg3)
+ //
+ // If the optional is non-empty, and the `args` refer to subobjects of the
+ // current object, then behaviour is undefined, because the current object
+ // will be destructed before the new object is constructed with `args`.
+ template <typename... Args,
+ typename = typename std::enable_if<
+ std::is_constructible<T, Args&&...>::value>::type>
+ T& emplace(Args&&... args) {
+ this->destruct();
+ this->construct(std::forward<Args>(args)...);
+ return reference();
+ }
+
+ // Emplace reconstruction overload for an initializer list and the given
+ // forwarded arguments.
+ //
+ // Example:
+ //
+ // struct Foo {
+ // Foo(std::initializer_list<int>);
+ // };
+ //
+ // optional<Foo> opt;
+ // opt.emplace({1,2,3}); // Constructs Foo({1,2,3})
+ template <typename U, typename... Args,
+ typename = typename std::enable_if<std::is_constructible<
+ T, std::initializer_list<U>&, Args&&...>::value>::type>
+ T& emplace(std::initializer_list<U> il, Args&&... args) {
+ this->destruct();
+ this->construct(il, std::forward<Args>(args)...);
+ return reference();
+ }
+
+ // Swaps
+
+ // Swap, standard semantics
+ void swap(optional& rhs) noexcept(
+ std::is_nothrow_move_constructible<T>::value&&
+ type_traits_internal::IsNothrowSwappable<T>::value) {
+ if (*this) {
+ if (rhs) {
+ type_traits_internal::Swap(**this, *rhs);
+ } else {
+ rhs.construct(std::move(**this));
+ this->destruct();
+ }
+ } else {
+ if (rhs) {
+ this->construct(std::move(*rhs));
+ rhs.destruct();
+ } else {
+ // No effect (swap(disengaged, disengaged)).
+ }
+ }
+ }
+
+ // Observers
+
+ // optional::operator->()
+ //
+ // Accesses the underlying `T` value's member `m` of an `optional`. If the
+ // `optional` is empty, behavior is undefined.
+ //
+ // If you need myOpt->foo in constexpr, use (*myOpt).foo instead.
+ const T* operator->() const {
+ ABSL_HARDENING_ASSERT(this->engaged_);
+ return std::addressof(this->data_);
+ }
+ T* operator->() {
+ ABSL_HARDENING_ASSERT(this->engaged_);
+ return std::addressof(this->data_);
+ }
+
+ // optional::operator*()
+ //
+ // Accesses the underlying `T` value of an `optional`. If the `optional` is
+ // empty, behavior is undefined.
+ constexpr const T& operator*() const& {
+ return ABSL_HARDENING_ASSERT(this->engaged_), reference();
+ }
+ T& operator*() & {
+ ABSL_HARDENING_ASSERT(this->engaged_);
+ return reference();
+ }
+ constexpr const T&& operator*() const && {
+ return ABSL_HARDENING_ASSERT(this->engaged_), absl::move(reference());
+ }
+ T&& operator*() && {
+ ABSL_HARDENING_ASSERT(this->engaged_);
+ return std::move(reference());
+ }
+
+ // optional::operator bool()
+ //
+ // Returns false if and only if the `optional` is empty.
+ //
+ // if (opt) {
+ // // do something with *opt or opt->;
+ // } else {
+ // // opt is empty.
+ // }
+ //
+ constexpr explicit operator bool() const noexcept { return this->engaged_; }
+
+ // optional::has_value()
+ //
+ // Determines whether the `optional` contains a value. Returns `false` if and
+ // only if `*this` is empty.
+ constexpr bool has_value() const noexcept { return this->engaged_; }
+
+// Suppress bogus warning on MSVC: MSVC complains call to reference() after
+// throw_bad_optional_access() is unreachable.
+#ifdef _MSC_VER
+#pragma warning(push)
+#pragma warning(disable : 4702)
+#endif // _MSC_VER
+ // optional::value()
+ //
+ // Returns a reference to an `optional`s underlying value. The constness
+ // and lvalue/rvalue-ness of the `optional` is preserved to the view of
+ // the `T` sub-object. Throws `absl::bad_optional_access` when the `optional`
+ // is empty.
+ constexpr const T& value() const & {
+ return static_cast<bool>(*this)
+ ? reference()
+ : (optional_internal::throw_bad_optional_access(), reference());
+ }
+ T& value() & {
+ return static_cast<bool>(*this)
+ ? reference()
+ : (optional_internal::throw_bad_optional_access(), reference());
+ }
+ T&& value() && { // NOLINT(build/c++11)
+ return std::move(
+ static_cast<bool>(*this)
+ ? reference()
+ : (optional_internal::throw_bad_optional_access(), reference()));
+ }
+ constexpr const T&& value() const && { // NOLINT(build/c++11)
+ return absl::move(
+ static_cast<bool>(*this)
+ ? reference()
+ : (optional_internal::throw_bad_optional_access(), reference()));
+ }
+#ifdef _MSC_VER
+#pragma warning(pop)
+#endif // _MSC_VER
+
+ // optional::value_or()
+ //
+ // Returns either the value of `T` or a passed default `v` if the `optional`
+ // is empty.
+ template <typename U>
+ constexpr T value_or(U&& v) const& {
+ static_assert(std::is_copy_constructible<value_type>::value,
+ "optional<T>::value_or: T must be copy constructible");
+ static_assert(std::is_convertible<U&&, value_type>::value,
+ "optional<T>::value_or: U must be convertible to T");
+ return static_cast<bool>(*this)
+ ? **this
+ : static_cast<T>(absl::forward<U>(v));
+ }
+ template <typename U>
+ T value_or(U&& v) && { // NOLINT(build/c++11)
+ static_assert(std::is_move_constructible<value_type>::value,
+ "optional<T>::value_or: T must be move constructible");
+ static_assert(std::is_convertible<U&&, value_type>::value,
+ "optional<T>::value_or: U must be convertible to T");
+ return static_cast<bool>(*this) ? std::move(**this)
+ : static_cast<T>(std::forward<U>(v));
+ }
+
+ private:
+ // Private accessors for internal storage viewed as reference to T.
+ constexpr const T& reference() const { return this->data_; }
+ T& reference() { return this->data_; }
+
+ // T constraint checks. You can't have an optional of nullopt_t, in_place_t
+ // or a reference.
+ static_assert(
+ !std::is_same<nullopt_t, typename std::remove_cv<T>::type>::value,
+ "optional<nullopt_t> is not allowed.");
+ static_assert(
+ !std::is_same<in_place_t, typename std::remove_cv<T>::type>::value,
+ "optional<in_place_t> is not allowed.");
+ static_assert(!std::is_reference<T>::value,
+ "optional<reference> is not allowed.");
+};
+
+// Non-member functions
+
+// swap()
+//
+// Performs a swap between two `absl::optional` objects, using standard
+// semantics.
+template <typename T, typename std::enable_if<
+ std::is_move_constructible<T>::value &&
+ type_traits_internal::IsSwappable<T>::value,
+ bool>::type = false>
+void swap(optional<T>& a, optional<T>& b) noexcept(noexcept(a.swap(b))) {
+ a.swap(b);
+}
+
+// make_optional()
+//
+// Creates a non-empty `optional<T>` where the type of `T` is deduced. An
+// `absl::optional` can also be explicitly instantiated with
+// `make_optional<T>(v)`.
+//
+// Note: `make_optional()` constructions may be declared `constexpr` for
+// trivially copyable types `T`. Non-trivial types require copy elision
+// support in C++17 for `make_optional` to support `constexpr` on such
+// non-trivial types.
+//
+// Example:
+//
+// constexpr absl::optional<int> opt = absl::make_optional(1);
+// static_assert(opt.value() == 1, "");
+template <typename T>
+constexpr optional<typename std::decay<T>::type> make_optional(T&& v) {
+ return optional<typename std::decay<T>::type>(absl::forward<T>(v));
+}
+
+template <typename T, typename... Args>
+constexpr optional<T> make_optional(Args&&... args) {
+ return optional<T>(in_place_t(), absl::forward<Args>(args)...);
+}
+
+template <typename T, typename U, typename... Args>
+constexpr optional<T> make_optional(std::initializer_list<U> il,
+ Args&&... args) {
+ return optional<T>(in_place_t(), il,
+ absl::forward<Args>(args)...);
+}
+
+// Relational operators [optional.relops]
+
+// Empty optionals are considered equal to each other and less than non-empty
+// optionals. Supports relations between optional<T> and optional<U>, between
+// optional<T> and U, and between optional<T> and nullopt.
+//
+// Note: We're careful to support T having non-bool relationals.
+
+// Requires: The expression, e.g. "*x == *y" shall be well-formed and its result
+// shall be convertible to bool.
+// The C++17 (N4606) "Returns:" statements are translated into
+// code in an obvious way here, and the original text retained as function docs.
+// Returns: If bool(x) != bool(y), false; otherwise if bool(x) == false, true;
+// otherwise *x == *y.
+template <typename T, typename U>
+constexpr auto operator==(const optional<T>& x, const optional<U>& y)
+ -> decltype(optional_internal::convertible_to_bool(*x == *y)) {
+ return static_cast<bool>(x) != static_cast<bool>(y)
+ ? false
+ : static_cast<bool>(x) == false ? true
+ : static_cast<bool>(*x == *y);
+}
+
+// Returns: If bool(x) != bool(y), true; otherwise, if bool(x) == false, false;
+// otherwise *x != *y.
+template <typename T, typename U>
+constexpr auto operator!=(const optional<T>& x, const optional<U>& y)
+ -> decltype(optional_internal::convertible_to_bool(*x != *y)) {
+ return static_cast<bool>(x) != static_cast<bool>(y)
+ ? true
+ : static_cast<bool>(x) == false ? false
+ : static_cast<bool>(*x != *y);
+}
+// Returns: If !y, false; otherwise, if !x, true; otherwise *x < *y.
+template <typename T, typename U>
+constexpr auto operator<(const optional<T>& x, const optional<U>& y)
+ -> decltype(optional_internal::convertible_to_bool(*x < *y)) {
+ return !y ? false : !x ? true : static_cast<bool>(*x < *y);
+}
+// Returns: If !x, false; otherwise, if !y, true; otherwise *x > *y.
+template <typename T, typename U>
+constexpr auto operator>(const optional<T>& x, const optional<U>& y)
+ -> decltype(optional_internal::convertible_to_bool(*x > *y)) {
+ return !x ? false : !y ? true : static_cast<bool>(*x > *y);
+}
+// Returns: If !x, true; otherwise, if !y, false; otherwise *x <= *y.
+template <typename T, typename U>
+constexpr auto operator<=(const optional<T>& x, const optional<U>& y)
+ -> decltype(optional_internal::convertible_to_bool(*x <= *y)) {
+ return !x ? true : !y ? false : static_cast<bool>(*x <= *y);
+}
+// Returns: If !y, true; otherwise, if !x, false; otherwise *x >= *y.
+template <typename T, typename U>
+constexpr auto operator>=(const optional<T>& x, const optional<U>& y)
+ -> decltype(optional_internal::convertible_to_bool(*x >= *y)) {
+ return !y ? true : !x ? false : static_cast<bool>(*x >= *y);
+}
+
+// Comparison with nullopt [optional.nullops]
+// The C++17 (N4606) "Returns:" statements are used directly here.
+template <typename T>
+constexpr bool operator==(const optional<T>& x, nullopt_t) noexcept {
+ return !x;
+}
+template <typename T>
+constexpr bool operator==(nullopt_t, const optional<T>& x) noexcept {
+ return !x;
+}
+template <typename T>
+constexpr bool operator!=(const optional<T>& x, nullopt_t) noexcept {
+ return static_cast<bool>(x);
+}
+template <typename T>
+constexpr bool operator!=(nullopt_t, const optional<T>& x) noexcept {
+ return static_cast<bool>(x);
+}
+template <typename T>
+constexpr bool operator<(const optional<T>&, nullopt_t) noexcept {
+ return false;
+}
+template <typename T>
+constexpr bool operator<(nullopt_t, const optional<T>& x) noexcept {
+ return static_cast<bool>(x);
+}
+template <typename T>
+constexpr bool operator<=(const optional<T>& x, nullopt_t) noexcept {
+ return !x;
+}
+template <typename T>
+constexpr bool operator<=(nullopt_t, const optional<T>&) noexcept {
+ return true;
+}
+template <typename T>
+constexpr bool operator>(const optional<T>& x, nullopt_t) noexcept {
+ return static_cast<bool>(x);
+}
+template <typename T>
+constexpr bool operator>(nullopt_t, const optional<T>&) noexcept {
+ return false;
+}
+template <typename T>
+constexpr bool operator>=(const optional<T>&, nullopt_t) noexcept {
+ return true;
+}
+template <typename T>
+constexpr bool operator>=(nullopt_t, const optional<T>& x) noexcept {
+ return !x;
+}
+
+// Comparison with T [optional.comp_with_t]
+
+// Requires: The expression, e.g. "*x == v" shall be well-formed and its result
+// shall be convertible to bool.
+// The C++17 (N4606) "Equivalent to:" statements are used directly here.
+template <typename T, typename U>
+constexpr auto operator==(const optional<T>& x, const U& v)
+ -> decltype(optional_internal::convertible_to_bool(*x == v)) {
+ return static_cast<bool>(x) ? static_cast<bool>(*x == v) : false;
+}
+template <typename T, typename U>
+constexpr auto operator==(const U& v, const optional<T>& x)
+ -> decltype(optional_internal::convertible_to_bool(v == *x)) {
+ return static_cast<bool>(x) ? static_cast<bool>(v == *x) : false;
+}
+template <typename T, typename U>
+constexpr auto operator!=(const optional<T>& x, const U& v)
+ -> decltype(optional_internal::convertible_to_bool(*x != v)) {
+ return static_cast<bool>(x) ? static_cast<bool>(*x != v) : true;
+}
+template <typename T, typename U>
+constexpr auto operator!=(const U& v, const optional<T>& x)
+ -> decltype(optional_internal::convertible_to_bool(v != *x)) {
+ return static_cast<bool>(x) ? static_cast<bool>(v != *x) : true;
+}
+template <typename T, typename U>
+constexpr auto operator<(const optional<T>& x, const U& v)
+ -> decltype(optional_internal::convertible_to_bool(*x < v)) {
+ return static_cast<bool>(x) ? static_cast<bool>(*x < v) : true;
+}
+template <typename T, typename U>
+constexpr auto operator<(const U& v, const optional<T>& x)
+ -> decltype(optional_internal::convertible_to_bool(v < *x)) {
+ return static_cast<bool>(x) ? static_cast<bool>(v < *x) : false;
+}
+template <typename T, typename U>
+constexpr auto operator<=(const optional<T>& x, const U& v)
+ -> decltype(optional_internal::convertible_to_bool(*x <= v)) {
+ return static_cast<bool>(x) ? static_cast<bool>(*x <= v) : true;
+}
+template <typename T, typename U>
+constexpr auto operator<=(const U& v, const optional<T>& x)
+ -> decltype(optional_internal::convertible_to_bool(v <= *x)) {
+ return static_cast<bool>(x) ? static_cast<bool>(v <= *x) : false;
+}
+template <typename T, typename U>
+constexpr auto operator>(const optional<T>& x, const U& v)
+ -> decltype(optional_internal::convertible_to_bool(*x > v)) {
+ return static_cast<bool>(x) ? static_cast<bool>(*x > v) : false;
+}
+template <typename T, typename U>
+constexpr auto operator>(const U& v, const optional<T>& x)
+ -> decltype(optional_internal::convertible_to_bool(v > *x)) {
+ return static_cast<bool>(x) ? static_cast<bool>(v > *x) : true;
+}
+template <typename T, typename U>
+constexpr auto operator>=(const optional<T>& x, const U& v)
+ -> decltype(optional_internal::convertible_to_bool(*x >= v)) {
+ return static_cast<bool>(x) ? static_cast<bool>(*x >= v) : false;
+}
+template <typename T, typename U>
+constexpr auto operator>=(const U& v, const optional<T>& x)
+ -> decltype(optional_internal::convertible_to_bool(v >= *x)) {
+ return static_cast<bool>(x) ? static_cast<bool>(v >= *x) : true;
+}
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+namespace std {
+
+// std::hash specialization for absl::optional.
+template <typename T>
+struct hash<absl::optional<T> >
+ : absl::optional_internal::optional_hash_base<T> {};
+
+} // namespace std
+
+#undef ABSL_MSVC_CONSTEXPR_BUG_IN_UNION_LIKE_CLASS
+
+#endif // ABSL_USES_STD_OPTIONAL
+
+#endif // ABSL_TYPES_OPTIONAL_H_
diff --git a/third_party/abseil/src/absl/types/optional_exception_safety_test.cc b/third_party/abseil/src/absl/types/optional_exception_safety_test.cc
new file mode 100644
index 0000000..8e5fe85
--- /dev/null
+++ b/third_party/abseil/src/absl/types/optional_exception_safety_test.cc
@@ -0,0 +1,292 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/types/optional.h"
+
+#include "absl/base/config.h"
+
+// This test is a no-op when absl::optional is an alias for std::optional and
+// when exceptions are not enabled.
+#if !defined(ABSL_USES_STD_OPTIONAL) && defined(ABSL_HAVE_EXCEPTIONS)
+
+#include "gtest/gtest.h"
+#include "absl/base/internal/exception_safety_testing.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+namespace {
+
+using ::testing::AssertionFailure;
+using ::testing::AssertionResult;
+using ::testing::AssertionSuccess;
+using ::testing::MakeExceptionSafetyTester;
+
+using Thrower = testing::ThrowingValue<testing::TypeSpec::kEverythingThrows>;
+using Optional = absl::optional<Thrower>;
+
+using MoveThrower = testing::ThrowingValue<testing::TypeSpec::kNoThrowMove>;
+using MoveOptional = absl::optional<MoveThrower>;
+
+constexpr int kInitialInteger = 5;
+constexpr int kUpdatedInteger = 10;
+
+template <typename OptionalT>
+bool ValueThrowsBadOptionalAccess(const OptionalT& optional) try {
+ return (static_cast<void>(optional.value()), false);
+} catch (const absl::bad_optional_access&) {
+ return true;
+}
+
+template <typename OptionalT>
+AssertionResult OptionalInvariants(OptionalT* optional_ptr) {
+ // Check the current state post-throw for validity
+ auto& optional = *optional_ptr;
+
+ if (optional.has_value() && ValueThrowsBadOptionalAccess(optional)) {
+ return AssertionFailure()
+ << "Optional with value should not throw bad_optional_access when "
+ "accessing the value.";
+ }
+ if (!optional.has_value() && !ValueThrowsBadOptionalAccess(optional)) {
+ return AssertionFailure()
+ << "Optional without a value should throw bad_optional_access when "
+ "accessing the value.";
+ }
+
+ // Reset to a known state
+ optional.reset();
+
+ // Confirm that the known post-reset state is valid
+ if (optional.has_value()) {
+ return AssertionFailure()
+ << "Optional should not contain a value after being reset.";
+ }
+ if (!ValueThrowsBadOptionalAccess(optional)) {
+ return AssertionFailure() << "Optional should throw bad_optional_access "
+ "when accessing the value after being reset.";
+ }
+
+ return AssertionSuccess();
+}
+
+template <typename OptionalT>
+AssertionResult CheckDisengaged(OptionalT* optional_ptr) {
+ auto& optional = *optional_ptr;
+
+ if (optional.has_value()) {
+ return AssertionFailure()
+ << "Expected optional to not contain a value but a value was found.";
+ }
+
+ return AssertionSuccess();
+}
+
+template <typename OptionalT>
+AssertionResult CheckEngaged(OptionalT* optional_ptr) {
+ auto& optional = *optional_ptr;
+
+ if (!optional.has_value()) {
+ return AssertionFailure()
+ << "Expected optional to contain a value but no value was found.";
+ }
+
+ return AssertionSuccess();
+}
+
+TEST(OptionalExceptionSafety, ThrowingConstructors) {
+ auto thrower_nonempty = Optional(Thrower(kInitialInteger));
+ testing::TestThrowingCtor<Optional>(thrower_nonempty);
+
+ auto integer_nonempty = absl::optional<int>(kInitialInteger);
+ testing::TestThrowingCtor<Optional>(integer_nonempty);
+ testing::TestThrowingCtor<Optional>(std::move(integer_nonempty)); // NOLINT
+
+ testing::TestThrowingCtor<Optional>(kInitialInteger);
+ using ThrowerVec = std::vector<Thrower, testing::ThrowingAllocator<Thrower>>;
+ testing::TestThrowingCtor<absl::optional<ThrowerVec>>(
+ absl::in_place,
+ std::initializer_list<Thrower>{Thrower(), Thrower(), Thrower()},
+ testing::ThrowingAllocator<Thrower>());
+}
+
+TEST(OptionalExceptionSafety, NothrowConstructors) {
+ // This constructor is marked noexcept. If it throws, the program will
+ // terminate.
+ testing::TestThrowingCtor<MoveOptional>(MoveOptional(kUpdatedInteger));
+}
+
+TEST(OptionalExceptionSafety, Emplace) {
+ // Test the basic guarantee plus test the result of optional::has_value()
+ // is false in all cases
+ auto disengaged_test = MakeExceptionSafetyTester().WithContracts(
+ OptionalInvariants<Optional>, CheckDisengaged<Optional>);
+ auto disengaged_test_empty = disengaged_test.WithInitialValue(Optional());
+ auto disengaged_test_nonempty =
+ disengaged_test.WithInitialValue(Optional(kInitialInteger));
+
+ auto emplace_thrower_directly = [](Optional* optional_ptr) {
+ optional_ptr->emplace(kUpdatedInteger);
+ };
+ EXPECT_TRUE(disengaged_test_empty.Test(emplace_thrower_directly));
+ EXPECT_TRUE(disengaged_test_nonempty.Test(emplace_thrower_directly));
+
+ auto emplace_thrower_copy = [](Optional* optional_ptr) {
+ auto thrower = Thrower(kUpdatedInteger, testing::nothrow_ctor);
+ optional_ptr->emplace(thrower);
+ };
+ EXPECT_TRUE(disengaged_test_empty.Test(emplace_thrower_copy));
+ EXPECT_TRUE(disengaged_test_nonempty.Test(emplace_thrower_copy));
+}
+
+TEST(OptionalExceptionSafety, EverythingThrowsSwap) {
+ // Test the basic guarantee plus test the result of optional::has_value()
+ // remains the same
+ auto test =
+ MakeExceptionSafetyTester().WithContracts(OptionalInvariants<Optional>);
+ auto disengaged_test_empty = test.WithInitialValue(Optional())
+ .WithContracts(CheckDisengaged<Optional>);
+ auto engaged_test_nonempty = test.WithInitialValue(Optional(kInitialInteger))
+ .WithContracts(CheckEngaged<Optional>);
+
+ auto swap_empty = [](Optional* optional_ptr) {
+ auto empty = Optional();
+ optional_ptr->swap(empty);
+ };
+ EXPECT_TRUE(engaged_test_nonempty.Test(swap_empty));
+
+ auto swap_nonempty = [](Optional* optional_ptr) {
+ auto nonempty =
+ Optional(absl::in_place, kUpdatedInteger, testing::nothrow_ctor);
+ optional_ptr->swap(nonempty);
+ };
+ EXPECT_TRUE(disengaged_test_empty.Test(swap_nonempty));
+ EXPECT_TRUE(engaged_test_nonempty.Test(swap_nonempty));
+}
+
+TEST(OptionalExceptionSafety, NoThrowMoveSwap) {
+ // Tests the nothrow guarantee for optional of T with non-throwing move
+ {
+ auto empty = MoveOptional();
+ auto nonempty = MoveOptional(kInitialInteger);
+ EXPECT_TRUE(testing::TestNothrowOp([&]() { nonempty.swap(empty); }));
+ }
+ {
+ auto nonempty = MoveOptional(kUpdatedInteger);
+ auto empty = MoveOptional();
+ EXPECT_TRUE(testing::TestNothrowOp([&]() { empty.swap(nonempty); }));
+ }
+ {
+ auto nonempty_from = MoveOptional(kUpdatedInteger);
+ auto nonempty_to = MoveOptional(kInitialInteger);
+ EXPECT_TRUE(
+ testing::TestNothrowOp([&]() { nonempty_to.swap(nonempty_from); }));
+ }
+}
+
+TEST(OptionalExceptionSafety, CopyAssign) {
+ // Test the basic guarantee plus test the result of optional::has_value()
+ // remains the same
+ auto test =
+ MakeExceptionSafetyTester().WithContracts(OptionalInvariants<Optional>);
+ auto disengaged_test_empty = test.WithInitialValue(Optional())
+ .WithContracts(CheckDisengaged<Optional>);
+ auto engaged_test_nonempty = test.WithInitialValue(Optional(kInitialInteger))
+ .WithContracts(CheckEngaged<Optional>);
+
+ auto copyassign_nonempty = [](Optional* optional_ptr) {
+ auto nonempty =
+ Optional(absl::in_place, kUpdatedInteger, testing::nothrow_ctor);
+ *optional_ptr = nonempty;
+ };
+ EXPECT_TRUE(disengaged_test_empty.Test(copyassign_nonempty));
+ EXPECT_TRUE(engaged_test_nonempty.Test(copyassign_nonempty));
+
+ auto copyassign_thrower = [](Optional* optional_ptr) {
+ auto thrower = Thrower(kUpdatedInteger, testing::nothrow_ctor);
+ *optional_ptr = thrower;
+ };
+ EXPECT_TRUE(disengaged_test_empty.Test(copyassign_thrower));
+ EXPECT_TRUE(engaged_test_nonempty.Test(copyassign_thrower));
+}
+
+TEST(OptionalExceptionSafety, MoveAssign) {
+ // Test the basic guarantee plus test the result of optional::has_value()
+ // remains the same
+ auto test =
+ MakeExceptionSafetyTester().WithContracts(OptionalInvariants<Optional>);
+ auto disengaged_test_empty = test.WithInitialValue(Optional())
+ .WithContracts(CheckDisengaged<Optional>);
+ auto engaged_test_nonempty = test.WithInitialValue(Optional(kInitialInteger))
+ .WithContracts(CheckEngaged<Optional>);
+
+ auto moveassign_empty = [](Optional* optional_ptr) {
+ auto empty = Optional();
+ *optional_ptr = std::move(empty);
+ };
+ EXPECT_TRUE(engaged_test_nonempty.Test(moveassign_empty));
+
+ auto moveassign_nonempty = [](Optional* optional_ptr) {
+ auto nonempty =
+ Optional(absl::in_place, kUpdatedInteger, testing::nothrow_ctor);
+ *optional_ptr = std::move(nonempty);
+ };
+ EXPECT_TRUE(disengaged_test_empty.Test(moveassign_nonempty));
+ EXPECT_TRUE(engaged_test_nonempty.Test(moveassign_nonempty));
+
+ auto moveassign_thrower = [](Optional* optional_ptr) {
+ auto thrower = Thrower(kUpdatedInteger, testing::nothrow_ctor);
+ *optional_ptr = std::move(thrower);
+ };
+ EXPECT_TRUE(disengaged_test_empty.Test(moveassign_thrower));
+ EXPECT_TRUE(engaged_test_nonempty.Test(moveassign_thrower));
+}
+
+TEST(OptionalExceptionSafety, NothrowMoveAssign) {
+ // Tests the nothrow guarantee for optional of T with non-throwing move
+ {
+ auto empty = MoveOptional();
+ auto nonempty = MoveOptional(kInitialInteger);
+ EXPECT_TRUE(testing::TestNothrowOp([&]() { nonempty = std::move(empty); }));
+ }
+ {
+ auto nonempty = MoveOptional(kInitialInteger);
+ auto empty = MoveOptional();
+ EXPECT_TRUE(testing::TestNothrowOp([&]() { empty = std::move(nonempty); }));
+ }
+ {
+ auto nonempty_from = MoveOptional(kUpdatedInteger);
+ auto nonempty_to = MoveOptional(kInitialInteger);
+ EXPECT_TRUE(testing::TestNothrowOp(
+ [&]() { nonempty_to = std::move(nonempty_from); }));
+ }
+ {
+ auto thrower = MoveThrower(kUpdatedInteger);
+ auto empty = MoveOptional();
+ EXPECT_TRUE(testing::TestNothrowOp([&]() { empty = std::move(thrower); }));
+ }
+ {
+ auto thrower = MoveThrower(kUpdatedInteger);
+ auto nonempty = MoveOptional(kInitialInteger);
+ EXPECT_TRUE(
+ testing::TestNothrowOp([&]() { nonempty = std::move(thrower); }));
+ }
+}
+
+} // namespace
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // #if !defined(ABSL_USES_STD_OPTIONAL) && defined(ABSL_HAVE_EXCEPTIONS)
diff --git a/third_party/abseil/src/absl/types/optional_test.cc b/third_party/abseil/src/absl/types/optional_test.cc
new file mode 100644
index 0000000..7ef142c
--- /dev/null
+++ b/third_party/abseil/src/absl/types/optional_test.cc
@@ -0,0 +1,1659 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/types/optional.h"
+
+// This test is a no-op when absl::optional is an alias for std::optional.
+#if !defined(ABSL_USES_STD_OPTIONAL)
+
+#include <string>
+#include <type_traits>
+#include <utility>
+
+#include "gtest/gtest.h"
+#include "absl/base/config.h"
+#include "absl/base/internal/raw_logging.h"
+#include "absl/meta/type_traits.h"
+#include "absl/strings/string_view.h"
+
+struct Hashable {};
+
+namespace std {
+template <>
+struct hash<Hashable> {
+ size_t operator()(const Hashable&) { return 0; }
+};
+} // namespace std
+
+struct NonHashable {};
+
+namespace {
+
+std::string TypeQuals(std::string&) { return "&"; }
+std::string TypeQuals(std::string&&) { return "&&"; }
+std::string TypeQuals(const std::string&) { return "c&"; }
+std::string TypeQuals(const std::string&&) { return "c&&"; }
+
+struct StructorListener {
+ int construct0 = 0;
+ int construct1 = 0;
+ int construct2 = 0;
+ int listinit = 0;
+ int copy = 0;
+ int move = 0;
+ int copy_assign = 0;
+ int move_assign = 0;
+ int destruct = 0;
+ int volatile_copy = 0;
+ int volatile_move = 0;
+ int volatile_copy_assign = 0;
+ int volatile_move_assign = 0;
+};
+
+// Suppress MSVC warnings.
+// 4521: multiple copy constructors specified
+// 4522: multiple assignment operators specified
+// We wrote multiple of them to test that the correct overloads are selected.
+#ifdef _MSC_VER
+#pragma warning( push )
+#pragma warning( disable : 4521)
+#pragma warning( disable : 4522)
+#endif
+struct Listenable {
+ static StructorListener* listener;
+
+ Listenable() { ++listener->construct0; }
+ explicit Listenable(int /*unused*/) { ++listener->construct1; }
+ Listenable(int /*unused*/, int /*unused*/) { ++listener->construct2; }
+ Listenable(std::initializer_list<int> /*unused*/) { ++listener->listinit; }
+ Listenable(const Listenable& /*unused*/) { ++listener->copy; }
+ Listenable(const volatile Listenable& /*unused*/) {
+ ++listener->volatile_copy;
+ }
+ Listenable(volatile Listenable&& /*unused*/) { ++listener->volatile_move; }
+ Listenable(Listenable&& /*unused*/) { ++listener->move; }
+ Listenable& operator=(const Listenable& /*unused*/) {
+ ++listener->copy_assign;
+ return *this;
+ }
+ Listenable& operator=(Listenable&& /*unused*/) {
+ ++listener->move_assign;
+ return *this;
+ }
+ // use void return type instead of volatile T& to work around GCC warning
+ // when the assignment's returned reference is ignored.
+ void operator=(const volatile Listenable& /*unused*/) volatile {
+ ++listener->volatile_copy_assign;
+ }
+ void operator=(volatile Listenable&& /*unused*/) volatile {
+ ++listener->volatile_move_assign;
+ }
+ ~Listenable() { ++listener->destruct; }
+};
+#ifdef _MSC_VER
+#pragma warning( pop )
+#endif
+
+StructorListener* Listenable::listener = nullptr;
+
+// ABSL_HAVE_NO_CONSTEXPR_INITIALIZER_LIST is defined to 1 when the standard
+// library implementation doesn't marked initializer_list's default constructor
+// constexpr. The C++11 standard doesn't specify constexpr on it, but C++14
+// added it. However, libstdc++ 4.7 marked it constexpr.
+#if defined(_LIBCPP_VERSION) && \
+ (_LIBCPP_STD_VER <= 11 || defined(_LIBCPP_HAS_NO_CXX14_CONSTEXPR))
+#define ABSL_HAVE_NO_CONSTEXPR_INITIALIZER_LIST 1
+#endif
+
+struct ConstexprType {
+ enum CtorTypes {
+ kCtorDefault,
+ kCtorInt,
+ kCtorInitializerList,
+ kCtorConstChar
+ };
+ constexpr ConstexprType() : x(kCtorDefault) {}
+ constexpr explicit ConstexprType(int i) : x(kCtorInt) {}
+#ifndef ABSL_HAVE_NO_CONSTEXPR_INITIALIZER_LIST
+ constexpr ConstexprType(std::initializer_list<int> il)
+ : x(kCtorInitializerList) {}
+#endif
+ constexpr ConstexprType(const char*) // NOLINT(runtime/explicit)
+ : x(kCtorConstChar) {}
+ int x;
+};
+
+struct Copyable {
+ Copyable() {}
+ Copyable(const Copyable&) {}
+ Copyable& operator=(const Copyable&) { return *this; }
+};
+
+struct MoveableThrow {
+ MoveableThrow() {}
+ MoveableThrow(MoveableThrow&&) {}
+ MoveableThrow& operator=(MoveableThrow&&) { return *this; }
+};
+
+struct MoveableNoThrow {
+ MoveableNoThrow() {}
+ MoveableNoThrow(MoveableNoThrow&&) noexcept {}
+ MoveableNoThrow& operator=(MoveableNoThrow&&) noexcept { return *this; }
+};
+
+struct NonMovable {
+ NonMovable() {}
+ NonMovable(const NonMovable&) = delete;
+ NonMovable& operator=(const NonMovable&) = delete;
+ NonMovable(NonMovable&&) = delete;
+ NonMovable& operator=(NonMovable&&) = delete;
+};
+
+struct NoDefault {
+ NoDefault() = delete;
+ NoDefault(const NoDefault&) {}
+ NoDefault& operator=(const NoDefault&) { return *this; }
+};
+
+struct ConvertsFromInPlaceT {
+ ConvertsFromInPlaceT(absl::in_place_t) {} // NOLINT
+};
+
+TEST(optionalTest, DefaultConstructor) {
+ absl::optional<int> empty;
+ EXPECT_FALSE(empty);
+ constexpr absl::optional<int> cempty;
+ static_assert(!cempty.has_value(), "");
+ EXPECT_TRUE(
+ std::is_nothrow_default_constructible<absl::optional<int>>::value);
+}
+
+TEST(optionalTest, nulloptConstructor) {
+ absl::optional<int> empty(absl::nullopt);
+ EXPECT_FALSE(empty);
+ constexpr absl::optional<int> cempty{absl::nullopt};
+ static_assert(!cempty.has_value(), "");
+ EXPECT_TRUE((std::is_nothrow_constructible<absl::optional<int>,
+ absl::nullopt_t>::value));
+}
+
+TEST(optionalTest, CopyConstructor) {
+ {
+ absl::optional<int> empty, opt42 = 42;
+ absl::optional<int> empty_copy(empty);
+ EXPECT_FALSE(empty_copy);
+ absl::optional<int> opt42_copy(opt42);
+ EXPECT_TRUE(opt42_copy);
+ EXPECT_EQ(42, *opt42_copy);
+ }
+ {
+ absl::optional<const int> empty, opt42 = 42;
+ absl::optional<const int> empty_copy(empty);
+ EXPECT_FALSE(empty_copy);
+ absl::optional<const int> opt42_copy(opt42);
+ EXPECT_TRUE(opt42_copy);
+ EXPECT_EQ(42, *opt42_copy);
+ }
+ {
+ absl::optional<volatile int> empty, opt42 = 42;
+ absl::optional<volatile int> empty_copy(empty);
+ EXPECT_FALSE(empty_copy);
+ absl::optional<volatile int> opt42_copy(opt42);
+ EXPECT_TRUE(opt42_copy);
+ EXPECT_EQ(42, *opt42_copy);
+ }
+ // test copyablility
+ EXPECT_TRUE(std::is_copy_constructible<absl::optional<int>>::value);
+ EXPECT_TRUE(std::is_copy_constructible<absl::optional<Copyable>>::value);
+ EXPECT_FALSE(
+ std::is_copy_constructible<absl::optional<MoveableThrow>>::value);
+ EXPECT_FALSE(
+ std::is_copy_constructible<absl::optional<MoveableNoThrow>>::value);
+ EXPECT_FALSE(std::is_copy_constructible<absl::optional<NonMovable>>::value);
+
+ EXPECT_FALSE(
+ absl::is_trivially_copy_constructible<absl::optional<Copyable>>::value);
+#if defined(ABSL_USES_STD_OPTIONAL) && defined(__GLIBCXX__)
+ // libstdc++ std::optional implementation (as of 7.2) has a bug: when T is
+ // trivially copyable, optional<T> is not trivially copyable (due to one of
+ // its base class is unconditionally nontrivial).
+#define ABSL_GLIBCXX_OPTIONAL_TRIVIALITY_BUG 1
+#endif
+#ifndef ABSL_GLIBCXX_OPTIONAL_TRIVIALITY_BUG
+ EXPECT_TRUE(
+ absl::is_trivially_copy_constructible<absl::optional<int>>::value);
+ EXPECT_TRUE(
+ absl::is_trivially_copy_constructible<absl::optional<const int>>::value);
+#ifndef _MSC_VER
+ // See defect report "Trivial copy/move constructor for class with volatile
+ // member" at
+ // http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#2094
+ // A class with non-static data member of volatile-qualified type should still
+ // have a trivial copy constructor if the data member is trivial.
+ // Also a cv-qualified scalar type should be trivially copyable.
+ EXPECT_TRUE(absl::is_trivially_copy_constructible<
+ absl::optional<volatile int>>::value);
+#endif // _MSC_VER
+#endif // ABSL_GLIBCXX_OPTIONAL_TRIVIALITY_BUG
+
+ // constexpr copy constructor for trivially copyable types
+ {
+ constexpr absl::optional<int> o1;
+ constexpr absl::optional<int> o2 = o1;
+ static_assert(!o2, "");
+ }
+ {
+ constexpr absl::optional<int> o1 = 42;
+ constexpr absl::optional<int> o2 = o1;
+ static_assert(o2, "");
+ static_assert(*o2 == 42, "");
+ }
+ {
+ struct TrivialCopyable {
+ constexpr TrivialCopyable() : x(0) {}
+ constexpr explicit TrivialCopyable(int i) : x(i) {}
+ int x;
+ };
+ constexpr absl::optional<TrivialCopyable> o1(42);
+ constexpr absl::optional<TrivialCopyable> o2 = o1;
+ static_assert(o2, "");
+ static_assert((*o2).x == 42, "");
+#ifndef ABSL_GLIBCXX_OPTIONAL_TRIVIALITY_BUG
+ EXPECT_TRUE(absl::is_trivially_copy_constructible<
+ absl::optional<TrivialCopyable>>::value);
+ EXPECT_TRUE(absl::is_trivially_copy_constructible<
+ absl::optional<const TrivialCopyable>>::value);
+#endif
+ // When testing with VS 2017 15.3, there seems to be a bug in MSVC
+ // std::optional when T is volatile-qualified. So skipping this test.
+ // Bug report:
+ // https://connect.microsoft.com/VisualStudio/feedback/details/3142534
+#if defined(ABSL_USES_STD_OPTIONAL) && defined(_MSC_VER) && _MSC_VER >= 1911
+#define ABSL_MSVC_OPTIONAL_VOLATILE_COPY_BUG 1
+#endif
+#ifndef ABSL_MSVC_OPTIONAL_VOLATILE_COPY_BUG
+ EXPECT_FALSE(std::is_copy_constructible<
+ absl::optional<volatile TrivialCopyable>>::value);
+#endif
+ }
+}
+
+TEST(optionalTest, MoveConstructor) {
+ absl::optional<int> empty, opt42 = 42;
+ absl::optional<int> empty_move(std::move(empty));
+ EXPECT_FALSE(empty_move);
+ absl::optional<int> opt42_move(std::move(opt42));
+ EXPECT_TRUE(opt42_move);
+ EXPECT_EQ(42, opt42_move);
+ // test movability
+ EXPECT_TRUE(std::is_move_constructible<absl::optional<int>>::value);
+ EXPECT_TRUE(std::is_move_constructible<absl::optional<Copyable>>::value);
+ EXPECT_TRUE(std::is_move_constructible<absl::optional<MoveableThrow>>::value);
+ EXPECT_TRUE(
+ std::is_move_constructible<absl::optional<MoveableNoThrow>>::value);
+ EXPECT_FALSE(std::is_move_constructible<absl::optional<NonMovable>>::value);
+ // test noexcept
+ EXPECT_TRUE(std::is_nothrow_move_constructible<absl::optional<int>>::value);
+#ifndef ABSL_USES_STD_OPTIONAL
+ EXPECT_EQ(
+ absl::default_allocator_is_nothrow::value,
+ std::is_nothrow_move_constructible<absl::optional<MoveableThrow>>::value);
+#endif
+ EXPECT_TRUE(std::is_nothrow_move_constructible<
+ absl::optional<MoveableNoThrow>>::value);
+}
+
+TEST(optionalTest, Destructor) {
+ struct Trivial {};
+
+ struct NonTrivial {
+ NonTrivial(const NonTrivial&) {}
+ NonTrivial& operator=(const NonTrivial&) { return *this; }
+ ~NonTrivial() {}
+ };
+
+ EXPECT_TRUE(std::is_trivially_destructible<absl::optional<int>>::value);
+ EXPECT_TRUE(std::is_trivially_destructible<absl::optional<Trivial>>::value);
+ EXPECT_FALSE(
+ std::is_trivially_destructible<absl::optional<NonTrivial>>::value);
+}
+
+TEST(optionalTest, InPlaceConstructor) {
+ constexpr absl::optional<ConstexprType> opt0{absl::in_place_t()};
+ static_assert(opt0, "");
+ static_assert((*opt0).x == ConstexprType::kCtorDefault, "");
+ constexpr absl::optional<ConstexprType> opt1{absl::in_place_t(), 1};
+ static_assert(opt1, "");
+ static_assert((*opt1).x == ConstexprType::kCtorInt, "");
+#ifndef ABSL_HAVE_NO_CONSTEXPR_INITIALIZER_LIST
+ constexpr absl::optional<ConstexprType> opt2{absl::in_place_t(), {1, 2}};
+ static_assert(opt2, "");
+ static_assert((*opt2).x == ConstexprType::kCtorInitializerList, "");
+#endif
+
+ EXPECT_FALSE((std::is_constructible<absl::optional<ConvertsFromInPlaceT>,
+ absl::in_place_t>::value));
+ EXPECT_FALSE((std::is_constructible<absl::optional<ConvertsFromInPlaceT>,
+ const absl::in_place_t&>::value));
+ EXPECT_TRUE(
+ (std::is_constructible<absl::optional<ConvertsFromInPlaceT>,
+ absl::in_place_t, absl::in_place_t>::value));
+
+ EXPECT_FALSE((std::is_constructible<absl::optional<NoDefault>,
+ absl::in_place_t>::value));
+ EXPECT_FALSE((std::is_constructible<absl::optional<NoDefault>,
+ absl::in_place_t&&>::value));
+}
+
+// template<U=T> optional(U&&);
+TEST(optionalTest, ValueConstructor) {
+ constexpr absl::optional<int> opt0(0);
+ static_assert(opt0, "");
+ static_assert(*opt0 == 0, "");
+ EXPECT_TRUE((std::is_convertible<int, absl::optional<int>>::value));
+ // Copy initialization ( = "abc") won't work due to optional(optional&&)
+ // is not constexpr. Use list initialization instead. This invokes
+ // absl::optional<ConstexprType>::absl::optional<U>(U&&), with U = const char
+ // (&) [4], which direct-initializes the ConstexprType value held by the
+ // optional via ConstexprType::ConstexprType(const char*).
+ constexpr absl::optional<ConstexprType> opt1 = {"abc"};
+ static_assert(opt1, "");
+ static_assert(ConstexprType::kCtorConstChar == (*opt1).x, "");
+ EXPECT_TRUE(
+ (std::is_convertible<const char*, absl::optional<ConstexprType>>::value));
+ // direct initialization
+ constexpr absl::optional<ConstexprType> opt2{2};
+ static_assert(opt2, "");
+ static_assert(ConstexprType::kCtorInt == (*opt2).x, "");
+ EXPECT_FALSE(
+ (std::is_convertible<int, absl::optional<ConstexprType>>::value));
+
+ // this invokes absl::optional<int>::optional(int&&)
+ // NOTE: this has different behavior than assignment, e.g.
+ // "opt3 = {};" clears the optional rather than setting the value to 0
+ // According to C++17 standard N4659 [over.ics.list] 16.3.3.1.5, (9.2)- "if
+ // the initializer list has no elements, the implicit conversion is the
+ // identity conversion", so `optional(int&&)` should be a better match than
+ // `optional(optional&&)` which is a user-defined conversion.
+ // Note: GCC 7 has a bug with this overload selection when compiled with
+ // `-std=c++17`.
+#if defined(__GNUC__) && !defined(__clang__) && __GNUC__ == 7 && \
+ __cplusplus == 201703L
+#define ABSL_GCC7_OVER_ICS_LIST_BUG 1
+#endif
+#ifndef ABSL_GCC7_OVER_ICS_LIST_BUG
+ constexpr absl::optional<int> opt3({});
+ static_assert(opt3, "");
+ static_assert(*opt3 == 0, "");
+#endif
+
+ // this invokes the move constructor with a default constructed optional
+ // because non-template function is a better match than template function.
+ absl::optional<ConstexprType> opt4({});
+ EXPECT_FALSE(opt4);
+}
+
+struct Implicit {};
+
+struct Explicit {};
+
+struct Convert {
+ Convert(const Implicit&) // NOLINT(runtime/explicit)
+ : implicit(true), move(false) {}
+ Convert(Implicit&&) // NOLINT(runtime/explicit)
+ : implicit(true), move(true) {}
+ explicit Convert(const Explicit&) : implicit(false), move(false) {}
+ explicit Convert(Explicit&&) : implicit(false), move(true) {}
+
+ bool implicit;
+ bool move;
+};
+
+struct ConvertFromOptional {
+ ConvertFromOptional(const Implicit&) // NOLINT(runtime/explicit)
+ : implicit(true), move(false), from_optional(false) {}
+ ConvertFromOptional(Implicit&&) // NOLINT(runtime/explicit)
+ : implicit(true), move(true), from_optional(false) {}
+ ConvertFromOptional(
+ const absl::optional<Implicit>&) // NOLINT(runtime/explicit)
+ : implicit(true), move(false), from_optional(true) {}
+ ConvertFromOptional(absl::optional<Implicit>&&) // NOLINT(runtime/explicit)
+ : implicit(true), move(true), from_optional(true) {}
+ explicit ConvertFromOptional(const Explicit&)
+ : implicit(false), move(false), from_optional(false) {}
+ explicit ConvertFromOptional(Explicit&&)
+ : implicit(false), move(true), from_optional(false) {}
+ explicit ConvertFromOptional(const absl::optional<Explicit>&)
+ : implicit(false), move(false), from_optional(true) {}
+ explicit ConvertFromOptional(absl::optional<Explicit>&&)
+ : implicit(false), move(true), from_optional(true) {}
+
+ bool implicit;
+ bool move;
+ bool from_optional;
+};
+
+TEST(optionalTest, ConvertingConstructor) {
+ absl::optional<Implicit> i_empty;
+ absl::optional<Implicit> i(absl::in_place);
+ absl::optional<Explicit> e_empty;
+ absl::optional<Explicit> e(absl::in_place);
+ {
+ // implicitly constructing absl::optional<Convert> from
+ // absl::optional<Implicit>
+ absl::optional<Convert> empty = i_empty;
+ EXPECT_FALSE(empty);
+ absl::optional<Convert> opt_copy = i;
+ EXPECT_TRUE(opt_copy);
+ EXPECT_TRUE(opt_copy->implicit);
+ EXPECT_FALSE(opt_copy->move);
+ absl::optional<Convert> opt_move = absl::optional<Implicit>(absl::in_place);
+ EXPECT_TRUE(opt_move);
+ EXPECT_TRUE(opt_move->implicit);
+ EXPECT_TRUE(opt_move->move);
+ }
+ {
+ // explicitly constructing absl::optional<Convert> from
+ // absl::optional<Explicit>
+ absl::optional<Convert> empty(e_empty);
+ EXPECT_FALSE(empty);
+ absl::optional<Convert> opt_copy(e);
+ EXPECT_TRUE(opt_copy);
+ EXPECT_FALSE(opt_copy->implicit);
+ EXPECT_FALSE(opt_copy->move);
+ EXPECT_FALSE((std::is_convertible<const absl::optional<Explicit>&,
+ absl::optional<Convert>>::value));
+ absl::optional<Convert> opt_move{absl::optional<Explicit>(absl::in_place)};
+ EXPECT_TRUE(opt_move);
+ EXPECT_FALSE(opt_move->implicit);
+ EXPECT_TRUE(opt_move->move);
+ EXPECT_FALSE((std::is_convertible<absl::optional<Explicit>&&,
+ absl::optional<Convert>>::value));
+ }
+ {
+ // implicitly constructing absl::optional<ConvertFromOptional> from
+ // absl::optional<Implicit> via
+ // ConvertFromOptional(absl::optional<Implicit>&&) check that
+ // ConvertFromOptional(Implicit&&) is NOT called
+ static_assert(
+ std::is_convertible<absl::optional<Implicit>,
+ absl::optional<ConvertFromOptional>>::value,
+ "");
+ absl::optional<ConvertFromOptional> opt0 = i_empty;
+ EXPECT_TRUE(opt0);
+ EXPECT_TRUE(opt0->implicit);
+ EXPECT_FALSE(opt0->move);
+ EXPECT_TRUE(opt0->from_optional);
+ absl::optional<ConvertFromOptional> opt1 = absl::optional<Implicit>();
+ EXPECT_TRUE(opt1);
+ EXPECT_TRUE(opt1->implicit);
+ EXPECT_TRUE(opt1->move);
+ EXPECT_TRUE(opt1->from_optional);
+ }
+ {
+ // implicitly constructing absl::optional<ConvertFromOptional> from
+ // absl::optional<Explicit> via
+ // ConvertFromOptional(absl::optional<Explicit>&&) check that
+ // ConvertFromOptional(Explicit&&) is NOT called
+ absl::optional<ConvertFromOptional> opt0(e_empty);
+ EXPECT_TRUE(opt0);
+ EXPECT_FALSE(opt0->implicit);
+ EXPECT_FALSE(opt0->move);
+ EXPECT_TRUE(opt0->from_optional);
+ EXPECT_FALSE(
+ (std::is_convertible<const absl::optional<Explicit>&,
+ absl::optional<ConvertFromOptional>>::value));
+ absl::optional<ConvertFromOptional> opt1{absl::optional<Explicit>()};
+ EXPECT_TRUE(opt1);
+ EXPECT_FALSE(opt1->implicit);
+ EXPECT_TRUE(opt1->move);
+ EXPECT_TRUE(opt1->from_optional);
+ EXPECT_FALSE(
+ (std::is_convertible<absl::optional<Explicit>&&,
+ absl::optional<ConvertFromOptional>>::value));
+ }
+}
+
+TEST(optionalTest, StructorBasic) {
+ StructorListener listener;
+ Listenable::listener = &listener;
+ {
+ absl::optional<Listenable> empty;
+ EXPECT_FALSE(empty);
+ absl::optional<Listenable> opt0(absl::in_place);
+ EXPECT_TRUE(opt0);
+ absl::optional<Listenable> opt1(absl::in_place, 1);
+ EXPECT_TRUE(opt1);
+ absl::optional<Listenable> opt2(absl::in_place, 1, 2);
+ EXPECT_TRUE(opt2);
+ }
+ EXPECT_EQ(1, listener.construct0);
+ EXPECT_EQ(1, listener.construct1);
+ EXPECT_EQ(1, listener.construct2);
+ EXPECT_EQ(3, listener.destruct);
+}
+
+TEST(optionalTest, CopyMoveStructor) {
+ StructorListener listener;
+ Listenable::listener = &listener;
+ absl::optional<Listenable> original(absl::in_place);
+ EXPECT_EQ(1, listener.construct0);
+ EXPECT_EQ(0, listener.copy);
+ EXPECT_EQ(0, listener.move);
+ absl::optional<Listenable> copy(original);
+ EXPECT_EQ(1, listener.construct0);
+ EXPECT_EQ(1, listener.copy);
+ EXPECT_EQ(0, listener.move);
+ absl::optional<Listenable> move(std::move(original));
+ EXPECT_EQ(1, listener.construct0);
+ EXPECT_EQ(1, listener.copy);
+ EXPECT_EQ(1, listener.move);
+}
+
+TEST(optionalTest, ListInit) {
+ StructorListener listener;
+ Listenable::listener = &listener;
+ absl::optional<Listenable> listinit1(absl::in_place, {1});
+ absl::optional<Listenable> listinit2(absl::in_place, {1, 2});
+ EXPECT_EQ(2, listener.listinit);
+}
+
+TEST(optionalTest, AssignFromNullopt) {
+ absl::optional<int> opt(1);
+ opt = absl::nullopt;
+ EXPECT_FALSE(opt);
+
+ StructorListener listener;
+ Listenable::listener = &listener;
+ absl::optional<Listenable> opt1(absl::in_place);
+ opt1 = absl::nullopt;
+ EXPECT_FALSE(opt1);
+ EXPECT_EQ(1, listener.construct0);
+ EXPECT_EQ(1, listener.destruct);
+
+ EXPECT_TRUE((
+ std::is_nothrow_assignable<absl::optional<int>, absl::nullopt_t>::value));
+ EXPECT_TRUE((std::is_nothrow_assignable<absl::optional<Listenable>,
+ absl::nullopt_t>::value));
+}
+
+TEST(optionalTest, CopyAssignment) {
+ const absl::optional<int> empty, opt1 = 1, opt2 = 2;
+ absl::optional<int> empty_to_opt1, opt1_to_opt2, opt2_to_empty;
+
+ EXPECT_FALSE(empty_to_opt1);
+ empty_to_opt1 = empty;
+ EXPECT_FALSE(empty_to_opt1);
+ empty_to_opt1 = opt1;
+ EXPECT_TRUE(empty_to_opt1);
+ EXPECT_EQ(1, empty_to_opt1.value());
+
+ EXPECT_FALSE(opt1_to_opt2);
+ opt1_to_opt2 = opt1;
+ EXPECT_TRUE(opt1_to_opt2);
+ EXPECT_EQ(1, opt1_to_opt2.value());
+ opt1_to_opt2 = opt2;
+ EXPECT_TRUE(opt1_to_opt2);
+ EXPECT_EQ(2, opt1_to_opt2.value());
+
+ EXPECT_FALSE(opt2_to_empty);
+ opt2_to_empty = opt2;
+ EXPECT_TRUE(opt2_to_empty);
+ EXPECT_EQ(2, opt2_to_empty.value());
+ opt2_to_empty = empty;
+ EXPECT_FALSE(opt2_to_empty);
+
+ EXPECT_FALSE(absl::is_copy_assignable<absl::optional<const int>>::value);
+ EXPECT_TRUE(absl::is_copy_assignable<absl::optional<Copyable>>::value);
+ EXPECT_FALSE(absl::is_copy_assignable<absl::optional<MoveableThrow>>::value);
+ EXPECT_FALSE(
+ absl::is_copy_assignable<absl::optional<MoveableNoThrow>>::value);
+ EXPECT_FALSE(absl::is_copy_assignable<absl::optional<NonMovable>>::value);
+
+ EXPECT_TRUE(absl::is_trivially_copy_assignable<int>::value);
+ EXPECT_TRUE(absl::is_trivially_copy_assignable<volatile int>::value);
+
+ struct Trivial {
+ int i;
+ };
+ struct NonTrivial {
+ NonTrivial& operator=(const NonTrivial&) { return *this; }
+ int i;
+ };
+
+ EXPECT_TRUE(absl::is_trivially_copy_assignable<Trivial>::value);
+ EXPECT_FALSE(absl::is_copy_assignable<const Trivial>::value);
+ EXPECT_FALSE(absl::is_copy_assignable<volatile Trivial>::value);
+ EXPECT_TRUE(absl::is_copy_assignable<NonTrivial>::value);
+ EXPECT_FALSE(absl::is_trivially_copy_assignable<NonTrivial>::value);
+
+ // std::optional doesn't support volatile nontrivial types.
+#ifndef ABSL_USES_STD_OPTIONAL
+ {
+ StructorListener listener;
+ Listenable::listener = &listener;
+
+ absl::optional<volatile Listenable> empty, set(absl::in_place);
+ EXPECT_EQ(1, listener.construct0);
+ absl::optional<volatile Listenable> empty_to_empty, empty_to_set,
+ set_to_empty(absl::in_place), set_to_set(absl::in_place);
+ EXPECT_EQ(3, listener.construct0);
+ empty_to_empty = empty; // no effect
+ empty_to_set = set; // copy construct
+ set_to_empty = empty; // destruct
+ set_to_set = set; // copy assign
+ EXPECT_EQ(1, listener.volatile_copy);
+ EXPECT_EQ(0, listener.volatile_move);
+ EXPECT_EQ(1, listener.destruct);
+ EXPECT_EQ(1, listener.volatile_copy_assign);
+ }
+#endif // ABSL_USES_STD_OPTIONAL
+}
+
+TEST(optionalTest, MoveAssignment) {
+ {
+ StructorListener listener;
+ Listenable::listener = &listener;
+
+ absl::optional<Listenable> empty1, empty2, set1(absl::in_place),
+ set2(absl::in_place);
+ EXPECT_EQ(2, listener.construct0);
+ absl::optional<Listenable> empty_to_empty, empty_to_set,
+ set_to_empty(absl::in_place), set_to_set(absl::in_place);
+ EXPECT_EQ(4, listener.construct0);
+ empty_to_empty = std::move(empty1);
+ empty_to_set = std::move(set1);
+ set_to_empty = std::move(empty2);
+ set_to_set = std::move(set2);
+ EXPECT_EQ(0, listener.copy);
+ EXPECT_EQ(1, listener.move);
+ EXPECT_EQ(1, listener.destruct);
+ EXPECT_EQ(1, listener.move_assign);
+ }
+ // std::optional doesn't support volatile nontrivial types.
+#ifndef ABSL_USES_STD_OPTIONAL
+ {
+ StructorListener listener;
+ Listenable::listener = &listener;
+
+ absl::optional<volatile Listenable> empty1, empty2, set1(absl::in_place),
+ set2(absl::in_place);
+ EXPECT_EQ(2, listener.construct0);
+ absl::optional<volatile Listenable> empty_to_empty, empty_to_set,
+ set_to_empty(absl::in_place), set_to_set(absl::in_place);
+ EXPECT_EQ(4, listener.construct0);
+ empty_to_empty = std::move(empty1); // no effect
+ empty_to_set = std::move(set1); // move construct
+ set_to_empty = std::move(empty2); // destruct
+ set_to_set = std::move(set2); // move assign
+ EXPECT_EQ(0, listener.volatile_copy);
+ EXPECT_EQ(1, listener.volatile_move);
+ EXPECT_EQ(1, listener.destruct);
+ EXPECT_EQ(1, listener.volatile_move_assign);
+ }
+#endif // ABSL_USES_STD_OPTIONAL
+ EXPECT_FALSE(absl::is_move_assignable<absl::optional<const int>>::value);
+ EXPECT_TRUE(absl::is_move_assignable<absl::optional<Copyable>>::value);
+ EXPECT_TRUE(absl::is_move_assignable<absl::optional<MoveableThrow>>::value);
+ EXPECT_TRUE(absl::is_move_assignable<absl::optional<MoveableNoThrow>>::value);
+ EXPECT_FALSE(absl::is_move_assignable<absl::optional<NonMovable>>::value);
+
+ EXPECT_FALSE(
+ std::is_nothrow_move_assignable<absl::optional<MoveableThrow>>::value);
+ EXPECT_TRUE(
+ std::is_nothrow_move_assignable<absl::optional<MoveableNoThrow>>::value);
+}
+
+struct NoConvertToOptional {
+ // disable implicit conversion from const NoConvertToOptional&
+ // to absl::optional<NoConvertToOptional>.
+ NoConvertToOptional(const NoConvertToOptional&) = delete;
+};
+
+struct CopyConvert {
+ CopyConvert(const NoConvertToOptional&);
+ CopyConvert& operator=(const CopyConvert&) = delete;
+ CopyConvert& operator=(const NoConvertToOptional&);
+};
+
+struct CopyConvertFromOptional {
+ CopyConvertFromOptional(const NoConvertToOptional&);
+ CopyConvertFromOptional(const absl::optional<NoConvertToOptional>&);
+ CopyConvertFromOptional& operator=(const CopyConvertFromOptional&) = delete;
+ CopyConvertFromOptional& operator=(const NoConvertToOptional&);
+ CopyConvertFromOptional& operator=(
+ const absl::optional<NoConvertToOptional>&);
+};
+
+struct MoveConvert {
+ MoveConvert(NoConvertToOptional&&);
+ MoveConvert& operator=(const MoveConvert&) = delete;
+ MoveConvert& operator=(NoConvertToOptional&&);
+};
+
+struct MoveConvertFromOptional {
+ MoveConvertFromOptional(NoConvertToOptional&&);
+ MoveConvertFromOptional(absl::optional<NoConvertToOptional>&&);
+ MoveConvertFromOptional& operator=(const MoveConvertFromOptional&) = delete;
+ MoveConvertFromOptional& operator=(NoConvertToOptional&&);
+ MoveConvertFromOptional& operator=(absl::optional<NoConvertToOptional>&&);
+};
+
+// template <typename U = T> absl::optional<T>& operator=(U&& v);
+TEST(optionalTest, ValueAssignment) {
+ absl::optional<int> opt;
+ EXPECT_FALSE(opt);
+ opt = 42;
+ EXPECT_TRUE(opt);
+ EXPECT_EQ(42, opt.value());
+ opt = absl::nullopt;
+ EXPECT_FALSE(opt);
+ opt = 42;
+ EXPECT_TRUE(opt);
+ EXPECT_EQ(42, opt.value());
+ opt = 43;
+ EXPECT_TRUE(opt);
+ EXPECT_EQ(43, opt.value());
+ opt = {}; // this should clear optional
+ EXPECT_FALSE(opt);
+
+ opt = {44};
+ EXPECT_TRUE(opt);
+ EXPECT_EQ(44, opt.value());
+
+ // U = const NoConvertToOptional&
+ EXPECT_TRUE((std::is_assignable<absl::optional<CopyConvert>&,
+ const NoConvertToOptional&>::value));
+ // U = const absl::optional<NoConvertToOptional>&
+ EXPECT_TRUE((std::is_assignable<absl::optional<CopyConvertFromOptional>&,
+ const NoConvertToOptional&>::value));
+ // U = const NoConvertToOptional& triggers SFINAE because
+ // std::is_constructible_v<MoveConvert, const NoConvertToOptional&> is false
+ EXPECT_FALSE((std::is_assignable<absl::optional<MoveConvert>&,
+ const NoConvertToOptional&>::value));
+ // U = NoConvertToOptional
+ EXPECT_TRUE((std::is_assignable<absl::optional<MoveConvert>&,
+ NoConvertToOptional&&>::value));
+ // U = const NoConvertToOptional& triggers SFINAE because
+ // std::is_constructible_v<MoveConvertFromOptional, const
+ // NoConvertToOptional&> is false
+ EXPECT_FALSE((std::is_assignable<absl::optional<MoveConvertFromOptional>&,
+ const NoConvertToOptional&>::value));
+ // U = NoConvertToOptional
+ EXPECT_TRUE((std::is_assignable<absl::optional<MoveConvertFromOptional>&,
+ NoConvertToOptional&&>::value));
+ // U = const absl::optional<NoConvertToOptional>&
+ EXPECT_TRUE(
+ (std::is_assignable<absl::optional<CopyConvertFromOptional>&,
+ const absl::optional<NoConvertToOptional>&>::value));
+ // U = absl::optional<NoConvertToOptional>
+ EXPECT_TRUE(
+ (std::is_assignable<absl::optional<MoveConvertFromOptional>&,
+ absl::optional<NoConvertToOptional>&&>::value));
+}
+
+// template <typename U> absl::optional<T>& operator=(const absl::optional<U>&
+// rhs); template <typename U> absl::optional<T>& operator=(absl::optional<U>&&
+// rhs);
+TEST(optionalTest, ConvertingAssignment) {
+ absl::optional<int> opt_i;
+ absl::optional<char> opt_c('c');
+ opt_i = opt_c;
+ EXPECT_TRUE(opt_i);
+ EXPECT_EQ(*opt_c, *opt_i);
+ opt_i = absl::optional<char>();
+ EXPECT_FALSE(opt_i);
+ opt_i = absl::optional<char>('d');
+ EXPECT_TRUE(opt_i);
+ EXPECT_EQ('d', *opt_i);
+
+ absl::optional<std::string> opt_str;
+ absl::optional<const char*> opt_cstr("abc");
+ opt_str = opt_cstr;
+ EXPECT_TRUE(opt_str);
+ EXPECT_EQ(std::string("abc"), *opt_str);
+ opt_str = absl::optional<const char*>();
+ EXPECT_FALSE(opt_str);
+ opt_str = absl::optional<const char*>("def");
+ EXPECT_TRUE(opt_str);
+ EXPECT_EQ(std::string("def"), *opt_str);
+
+ // operator=(const absl::optional<U>&) with U = NoConvertToOptional
+ EXPECT_TRUE(
+ (std::is_assignable<absl::optional<CopyConvert>,
+ const absl::optional<NoConvertToOptional>&>::value));
+ // operator=(const absl::optional<U>&) with U = NoConvertToOptional
+ // triggers SFINAE because
+ // std::is_constructible_v<MoveConvert, const NoConvertToOptional&> is false
+ EXPECT_FALSE(
+ (std::is_assignable<absl::optional<MoveConvert>&,
+ const absl::optional<NoConvertToOptional>&>::value));
+ // operator=(absl::optional<U>&&) with U = NoConvertToOptional
+ EXPECT_TRUE(
+ (std::is_assignable<absl::optional<MoveConvert>&,
+ absl::optional<NoConvertToOptional>&&>::value));
+ // operator=(const absl::optional<U>&) with U = NoConvertToOptional triggers
+ // SFINAE because std::is_constructible_v<MoveConvertFromOptional, const
+ // NoConvertToOptional&> is false. operator=(U&&) with U = const
+ // absl::optional<NoConverToOptional>& triggers SFINAE because
+ // std::is_constructible<MoveConvertFromOptional,
+ // absl::optional<NoConvertToOptional>&&> is true.
+ EXPECT_FALSE(
+ (std::is_assignable<absl::optional<MoveConvertFromOptional>&,
+ const absl::optional<NoConvertToOptional>&>::value));
+}
+
+TEST(optionalTest, ResetAndHasValue) {
+ StructorListener listener;
+ Listenable::listener = &listener;
+ absl::optional<Listenable> opt;
+ EXPECT_FALSE(opt);
+ EXPECT_FALSE(opt.has_value());
+ opt.emplace();
+ EXPECT_TRUE(opt);
+ EXPECT_TRUE(opt.has_value());
+ opt.reset();
+ EXPECT_FALSE(opt);
+ EXPECT_FALSE(opt.has_value());
+ EXPECT_EQ(1, listener.destruct);
+ opt.reset();
+ EXPECT_FALSE(opt);
+ EXPECT_FALSE(opt.has_value());
+
+ constexpr absl::optional<int> empty;
+ static_assert(!empty.has_value(), "");
+ constexpr absl::optional<int> nonempty(1);
+ static_assert(nonempty.has_value(), "");
+}
+
+TEST(optionalTest, Emplace) {
+ StructorListener listener;
+ Listenable::listener = &listener;
+ absl::optional<Listenable> opt;
+ EXPECT_FALSE(opt);
+ opt.emplace(1);
+ EXPECT_TRUE(opt);
+ opt.emplace(1, 2);
+ EXPECT_EQ(1, listener.construct1);
+ EXPECT_EQ(1, listener.construct2);
+ EXPECT_EQ(1, listener.destruct);
+
+ absl::optional<std::string> o;
+ EXPECT_TRUE((std::is_same<std::string&, decltype(o.emplace("abc"))>::value));
+ std::string& ref = o.emplace("abc");
+ EXPECT_EQ(&ref, &o.value());
+}
+
+TEST(optionalTest, ListEmplace) {
+ StructorListener listener;
+ Listenable::listener = &listener;
+ absl::optional<Listenable> opt;
+ EXPECT_FALSE(opt);
+ opt.emplace({1});
+ EXPECT_TRUE(opt);
+ opt.emplace({1, 2});
+ EXPECT_EQ(2, listener.listinit);
+ EXPECT_EQ(1, listener.destruct);
+
+ absl::optional<Listenable> o;
+ EXPECT_TRUE((std::is_same<Listenable&, decltype(o.emplace({1}))>::value));
+ Listenable& ref = o.emplace({1});
+ EXPECT_EQ(&ref, &o.value());
+}
+
+TEST(optionalTest, Swap) {
+ absl::optional<int> opt_empty, opt1 = 1, opt2 = 2;
+ EXPECT_FALSE(opt_empty);
+ EXPECT_TRUE(opt1);
+ EXPECT_EQ(1, opt1.value());
+ EXPECT_TRUE(opt2);
+ EXPECT_EQ(2, opt2.value());
+ swap(opt_empty, opt1);
+ EXPECT_FALSE(opt1);
+ EXPECT_TRUE(opt_empty);
+ EXPECT_EQ(1, opt_empty.value());
+ EXPECT_TRUE(opt2);
+ EXPECT_EQ(2, opt2.value());
+ swap(opt_empty, opt1);
+ EXPECT_FALSE(opt_empty);
+ EXPECT_TRUE(opt1);
+ EXPECT_EQ(1, opt1.value());
+ EXPECT_TRUE(opt2);
+ EXPECT_EQ(2, opt2.value());
+ swap(opt1, opt2);
+ EXPECT_FALSE(opt_empty);
+ EXPECT_TRUE(opt1);
+ EXPECT_EQ(2, opt1.value());
+ EXPECT_TRUE(opt2);
+ EXPECT_EQ(1, opt2.value());
+
+ EXPECT_TRUE(noexcept(opt1.swap(opt2)));
+ EXPECT_TRUE(noexcept(swap(opt1, opt2)));
+}
+
+template <int v>
+struct DeletedOpAddr {
+ int value = v;
+ constexpr DeletedOpAddr() = default;
+ constexpr const DeletedOpAddr<v>* operator&() const = delete; // NOLINT
+ DeletedOpAddr<v>* operator&() = delete; // NOLINT
+};
+
+// The static_assert featuring a constexpr call to operator->() is commented out
+// to document the fact that the current implementation of absl::optional<T>
+// expects such usecases to be malformed and not compile.
+TEST(optionalTest, OperatorAddr) {
+ constexpr int v = -1;
+ { // constexpr
+ constexpr absl::optional<DeletedOpAddr<v>> opt(absl::in_place_t{});
+ static_assert(opt.has_value(), "");
+ // static_assert(opt->value == v, "");
+ static_assert((*opt).value == v, "");
+ }
+ { // non-constexpr
+ const absl::optional<DeletedOpAddr<v>> opt(absl::in_place_t{});
+ EXPECT_TRUE(opt.has_value());
+ EXPECT_TRUE(opt->value == v);
+ EXPECT_TRUE((*opt).value == v);
+ }
+}
+
+TEST(optionalTest, PointerStuff) {
+ absl::optional<std::string> opt(absl::in_place, "foo");
+ EXPECT_EQ("foo", *opt);
+ const auto& opt_const = opt;
+ EXPECT_EQ("foo", *opt_const);
+ EXPECT_EQ(opt->size(), 3);
+ EXPECT_EQ(opt_const->size(), 3);
+
+ constexpr absl::optional<ConstexprType> opt1(1);
+ static_assert((*opt1).x == ConstexprType::kCtorInt, "");
+}
+
+// gcc has a bug pre 4.9.1 where it doesn't do correct overload resolution
+// when overloads are const-qualified and *this is an raluve.
+// Skip that test to make the build green again when using the old compiler.
+// https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59296 is fixed in 4.9.1.
+#if defined(__GNUC__) && !defined(__clang__)
+#define GCC_VERSION (__GNUC__ * 10000 \
+ + __GNUC_MINOR__ * 100 \
+ + __GNUC_PATCHLEVEL__)
+#if GCC_VERSION < 40901
+#define ABSL_SKIP_OVERLOAD_TEST_DUE_TO_GCC_BUG
+#endif
+#endif
+
+// MSVC has a bug with "cv-qualifiers in class construction", fixed in 2017. See
+// https://docs.microsoft.com/en-us/cpp/cpp-conformance-improvements-2017#bug-fixes
+// The compiler some incorrectly ingores the cv-qualifier when generating a
+// class object via a constructor call. For example:
+//
+// class optional {
+// constexpr T&& value() &&;
+// constexpr const T&& value() const &&;
+// }
+//
+// using COI = const absl::optional<int>;
+// static_assert(2 == COI(2).value(), ""); // const &&
+//
+// This should invoke the "const &&" overload but since it ignores the const
+// qualifier it finds the "&&" overload the best candidate.
+#if defined(_MSC_VER) && _MSC_VER < 1910
+#define ABSL_SKIP_OVERLOAD_TEST_DUE_TO_MSVC_BUG
+#endif
+
+TEST(optionalTest, Value) {
+ using O = absl::optional<std::string>;
+ using CO = const absl::optional<std::string>;
+ using OC = absl::optional<const std::string>;
+ O lvalue(absl::in_place, "lvalue");
+ CO clvalue(absl::in_place, "clvalue");
+ OC lvalue_c(absl::in_place, "lvalue_c");
+ EXPECT_EQ("lvalue", lvalue.value());
+ EXPECT_EQ("clvalue", clvalue.value());
+ EXPECT_EQ("lvalue_c", lvalue_c.value());
+ EXPECT_EQ("xvalue", O(absl::in_place, "xvalue").value());
+ EXPECT_EQ("xvalue_c", OC(absl::in_place, "xvalue_c").value());
+#ifndef ABSL_SKIP_OVERLOAD_TEST_DUE_TO_GCC_BUG
+ EXPECT_EQ("cxvalue", CO(absl::in_place, "cxvalue").value());
+#endif
+ EXPECT_EQ("&", TypeQuals(lvalue.value()));
+ EXPECT_EQ("c&", TypeQuals(clvalue.value()));
+ EXPECT_EQ("c&", TypeQuals(lvalue_c.value()));
+ EXPECT_EQ("&&", TypeQuals(O(absl::in_place, "xvalue").value()));
+#if !defined(ABSL_SKIP_OVERLOAD_TEST_DUE_TO_MSVC_BUG) && \
+ !defined(ABSL_SKIP_OVERLOAD_TEST_DUE_TO_GCC_BUG)
+ EXPECT_EQ("c&&", TypeQuals(CO(absl::in_place, "cxvalue").value()));
+#endif
+ EXPECT_EQ("c&&", TypeQuals(OC(absl::in_place, "xvalue_c").value()));
+
+ // test on volatile type
+ using OV = absl::optional<volatile int>;
+ OV lvalue_v(absl::in_place, 42);
+ EXPECT_EQ(42, lvalue_v.value());
+ EXPECT_EQ(42, OV(42).value());
+ EXPECT_TRUE((std::is_same<volatile int&, decltype(lvalue_v.value())>::value));
+ EXPECT_TRUE((std::is_same<volatile int&&, decltype(OV(42).value())>::value));
+
+ // test exception throw on value()
+ absl::optional<int> empty;
+#ifdef ABSL_HAVE_EXCEPTIONS
+ EXPECT_THROW((void)empty.value(), absl::bad_optional_access);
+#else
+ EXPECT_DEATH_IF_SUPPORTED((void)empty.value(), "Bad optional access");
+#endif
+
+ // test constexpr value()
+ constexpr absl::optional<int> o1(1);
+ static_assert(1 == o1.value(), ""); // const &
+#if !defined(_MSC_VER) && !defined(ABSL_SKIP_OVERLOAD_TEST_DUE_TO_GCC_BUG)
+ using COI = const absl::optional<int>;
+ static_assert(2 == COI(2).value(), ""); // const &&
+#endif
+}
+
+TEST(optionalTest, DerefOperator) {
+ using O = absl::optional<std::string>;
+ using CO = const absl::optional<std::string>;
+ using OC = absl::optional<const std::string>;
+ O lvalue(absl::in_place, "lvalue");
+ CO clvalue(absl::in_place, "clvalue");
+ OC lvalue_c(absl::in_place, "lvalue_c");
+ EXPECT_EQ("lvalue", *lvalue);
+ EXPECT_EQ("clvalue", *clvalue);
+ EXPECT_EQ("lvalue_c", *lvalue_c);
+ EXPECT_EQ("xvalue", *O(absl::in_place, "xvalue"));
+ EXPECT_EQ("xvalue_c", *OC(absl::in_place, "xvalue_c"));
+#ifndef ABSL_SKIP_OVERLOAD_TEST_DUE_TO_GCC_BUG
+ EXPECT_EQ("cxvalue", *CO(absl::in_place, "cxvalue"));
+#endif
+ EXPECT_EQ("&", TypeQuals(*lvalue));
+ EXPECT_EQ("c&", TypeQuals(*clvalue));
+ EXPECT_EQ("&&", TypeQuals(*O(absl::in_place, "xvalue")));
+#if !defined(ABSL_SKIP_OVERLOAD_TEST_DUE_TO_MSVC_BUG) && \
+ !defined(ABSL_SKIP_OVERLOAD_TEST_DUE_TO_GCC_BUG)
+ EXPECT_EQ("c&&", TypeQuals(*CO(absl::in_place, "cxvalue")));
+#endif
+ EXPECT_EQ("c&&", TypeQuals(*OC(absl::in_place, "xvalue_c")));
+
+ // test on volatile type
+ using OV = absl::optional<volatile int>;
+ OV lvalue_v(absl::in_place, 42);
+ EXPECT_EQ(42, *lvalue_v);
+ EXPECT_EQ(42, *OV(42));
+ EXPECT_TRUE((std::is_same<volatile int&, decltype(*lvalue_v)>::value));
+ EXPECT_TRUE((std::is_same<volatile int&&, decltype(*OV(42))>::value));
+
+ constexpr absl::optional<int> opt1(1);
+ static_assert(*opt1 == 1, "");
+#if !defined(_MSC_VER) && !defined(ABSL_SKIP_OVERLOAD_TEST_DUE_TO_GCC_BUG)
+ using COI = const absl::optional<int>;
+ static_assert(*COI(2) == 2, "");
+#endif
+}
+
+TEST(optionalTest, ValueOr) {
+ absl::optional<double> opt_empty, opt_set = 1.2;
+ EXPECT_EQ(42.0, opt_empty.value_or(42));
+ EXPECT_EQ(1.2, opt_set.value_or(42));
+ EXPECT_EQ(42.0, absl::optional<double>().value_or(42));
+ EXPECT_EQ(1.2, absl::optional<double>(1.2).value_or(42));
+
+ constexpr absl::optional<double> copt_empty, copt_set = {1.2};
+ static_assert(42.0 == copt_empty.value_or(42), "");
+ static_assert(1.2 == copt_set.value_or(42), "");
+#ifndef ABSL_SKIP_OVERLOAD_TEST_DUE_TO_MSVC_BUG
+ using COD = const absl::optional<double>;
+ static_assert(42.0 == COD().value_or(42), "");
+ static_assert(1.2 == COD(1.2).value_or(42), "");
+#endif
+}
+
+// make_optional cannot be constexpr until C++17
+TEST(optionalTest, make_optional) {
+ auto opt_int = absl::make_optional(42);
+ EXPECT_TRUE((std::is_same<decltype(opt_int), absl::optional<int>>::value));
+ EXPECT_EQ(42, opt_int);
+
+ StructorListener listener;
+ Listenable::listener = &listener;
+
+ absl::optional<Listenable> opt0 = absl::make_optional<Listenable>();
+ EXPECT_EQ(1, listener.construct0);
+ absl::optional<Listenable> opt1 = absl::make_optional<Listenable>(1);
+ EXPECT_EQ(1, listener.construct1);
+ absl::optional<Listenable> opt2 = absl::make_optional<Listenable>(1, 2);
+ EXPECT_EQ(1, listener.construct2);
+ absl::optional<Listenable> opt3 = absl::make_optional<Listenable>({1});
+ absl::optional<Listenable> opt4 = absl::make_optional<Listenable>({1, 2});
+ EXPECT_EQ(2, listener.listinit);
+
+ // Constexpr tests on trivially copyable types
+ // optional<T> has trivial copy/move ctors when T is trivially copyable.
+ // For nontrivial types with constexpr constructors, we need copy elision in
+ // C++17 for make_optional to be constexpr.
+ {
+ constexpr absl::optional<int> c_opt = absl::make_optional(42);
+ static_assert(c_opt.value() == 42, "");
+ }
+ {
+ struct TrivialCopyable {
+ constexpr TrivialCopyable() : x(0) {}
+ constexpr explicit TrivialCopyable(int i) : x(i) {}
+ int x;
+ };
+
+ constexpr TrivialCopyable v;
+ constexpr absl::optional<TrivialCopyable> c_opt0 = absl::make_optional(v);
+ static_assert((*c_opt0).x == 0, "");
+ constexpr absl::optional<TrivialCopyable> c_opt1 =
+ absl::make_optional<TrivialCopyable>();
+ static_assert((*c_opt1).x == 0, "");
+ constexpr absl::optional<TrivialCopyable> c_opt2 =
+ absl::make_optional<TrivialCopyable>(42);
+ static_assert((*c_opt2).x == 42, "");
+ }
+}
+
+template <typename T, typename U>
+void optionalTest_Comparisons_EXPECT_LESS(T x, U y) {
+ EXPECT_FALSE(x == y);
+ EXPECT_TRUE(x != y);
+ EXPECT_TRUE(x < y);
+ EXPECT_FALSE(x > y);
+ EXPECT_TRUE(x <= y);
+ EXPECT_FALSE(x >= y);
+}
+
+template <typename T, typename U>
+void optionalTest_Comparisons_EXPECT_SAME(T x, U y) {
+ EXPECT_TRUE(x == y);
+ EXPECT_FALSE(x != y);
+ EXPECT_FALSE(x < y);
+ EXPECT_FALSE(x > y);
+ EXPECT_TRUE(x <= y);
+ EXPECT_TRUE(x >= y);
+}
+
+template <typename T, typename U>
+void optionalTest_Comparisons_EXPECT_GREATER(T x, U y) {
+ EXPECT_FALSE(x == y);
+ EXPECT_TRUE(x != y);
+ EXPECT_FALSE(x < y);
+ EXPECT_TRUE(x > y);
+ EXPECT_FALSE(x <= y);
+ EXPECT_TRUE(x >= y);
+}
+
+
+template <typename T, typename U, typename V>
+void TestComparisons() {
+ absl::optional<T> ae, a2{2}, a4{4};
+ absl::optional<U> be, b2{2}, b4{4};
+ V v3 = 3;
+
+ // LHS: absl::nullopt, ae, a2, v3, a4
+ // RHS: absl::nullopt, be, b2, v3, b4
+
+ // optionalTest_Comparisons_EXPECT_NOT_TO_WORK(absl::nullopt,absl::nullopt);
+ optionalTest_Comparisons_EXPECT_SAME(absl::nullopt, be);
+ optionalTest_Comparisons_EXPECT_LESS(absl::nullopt, b2);
+ // optionalTest_Comparisons_EXPECT_NOT_TO_WORK(absl::nullopt,v3);
+ optionalTest_Comparisons_EXPECT_LESS(absl::nullopt, b4);
+
+ optionalTest_Comparisons_EXPECT_SAME(ae, absl::nullopt);
+ optionalTest_Comparisons_EXPECT_SAME(ae, be);
+ optionalTest_Comparisons_EXPECT_LESS(ae, b2);
+ optionalTest_Comparisons_EXPECT_LESS(ae, v3);
+ optionalTest_Comparisons_EXPECT_LESS(ae, b4);
+
+ optionalTest_Comparisons_EXPECT_GREATER(a2, absl::nullopt);
+ optionalTest_Comparisons_EXPECT_GREATER(a2, be);
+ optionalTest_Comparisons_EXPECT_SAME(a2, b2);
+ optionalTest_Comparisons_EXPECT_LESS(a2, v3);
+ optionalTest_Comparisons_EXPECT_LESS(a2, b4);
+
+ // optionalTest_Comparisons_EXPECT_NOT_TO_WORK(v3,absl::nullopt);
+ optionalTest_Comparisons_EXPECT_GREATER(v3, be);
+ optionalTest_Comparisons_EXPECT_GREATER(v3, b2);
+ optionalTest_Comparisons_EXPECT_SAME(v3, v3);
+ optionalTest_Comparisons_EXPECT_LESS(v3, b4);
+
+ optionalTest_Comparisons_EXPECT_GREATER(a4, absl::nullopt);
+ optionalTest_Comparisons_EXPECT_GREATER(a4, be);
+ optionalTest_Comparisons_EXPECT_GREATER(a4, b2);
+ optionalTest_Comparisons_EXPECT_GREATER(a4, v3);
+ optionalTest_Comparisons_EXPECT_SAME(a4, b4);
+}
+
+struct Int1 {
+ Int1() = default;
+ Int1(int i) : i(i) {} // NOLINT(runtime/explicit)
+ int i;
+};
+
+struct Int2 {
+ Int2() = default;
+ Int2(int i) : i(i) {} // NOLINT(runtime/explicit)
+ int i;
+};
+
+// comparison between Int1 and Int2
+constexpr bool operator==(const Int1& lhs, const Int2& rhs) {
+ return lhs.i == rhs.i;
+}
+constexpr bool operator!=(const Int1& lhs, const Int2& rhs) {
+ return !(lhs == rhs);
+}
+constexpr bool operator<(const Int1& lhs, const Int2& rhs) {
+ return lhs.i < rhs.i;
+}
+constexpr bool operator<=(const Int1& lhs, const Int2& rhs) {
+ return lhs < rhs || lhs == rhs;
+}
+constexpr bool operator>(const Int1& lhs, const Int2& rhs) {
+ return !(lhs <= rhs);
+}
+constexpr bool operator>=(const Int1& lhs, const Int2& rhs) {
+ return !(lhs < rhs);
+}
+
+TEST(optionalTest, Comparisons) {
+ TestComparisons<int, int, int>();
+ TestComparisons<const int, int, int>();
+ TestComparisons<Int1, int, int>();
+ TestComparisons<int, Int2, int>();
+ TestComparisons<Int1, Int2, int>();
+
+ // compare absl::optional<std::string> with const char*
+ absl::optional<std::string> opt_str = "abc";
+ const char* cstr = "abc";
+ EXPECT_TRUE(opt_str == cstr);
+ // compare absl::optional<std::string> with absl::optional<const char*>
+ absl::optional<const char*> opt_cstr = cstr;
+ EXPECT_TRUE(opt_str == opt_cstr);
+ // compare absl::optional<std::string> with absl::optional<absl::string_view>
+ absl::optional<absl::string_view> e1;
+ absl::optional<std::string> e2;
+ EXPECT_TRUE(e1 == e2);
+}
+
+
+TEST(optionalTest, SwapRegression) {
+ StructorListener listener;
+ Listenable::listener = &listener;
+
+ {
+ absl::optional<Listenable> a;
+ absl::optional<Listenable> b(absl::in_place);
+ a.swap(b);
+ }
+
+ EXPECT_EQ(1, listener.construct0);
+ EXPECT_EQ(1, listener.move);
+ EXPECT_EQ(2, listener.destruct);
+
+ {
+ absl::optional<Listenable> a(absl::in_place);
+ absl::optional<Listenable> b;
+ a.swap(b);
+ }
+
+ EXPECT_EQ(2, listener.construct0);
+ EXPECT_EQ(2, listener.move);
+ EXPECT_EQ(4, listener.destruct);
+}
+
+TEST(optionalTest, BigStringLeakCheck) {
+ constexpr size_t n = 1 << 16;
+
+ using OS = absl::optional<std::string>;
+
+ OS a;
+ OS b = absl::nullopt;
+ OS c = std::string(n, 'c');
+ std::string sd(n, 'd');
+ OS d = sd;
+ OS e(absl::in_place, n, 'e');
+ OS f;
+ f.emplace(n, 'f');
+
+ OS ca(a);
+ OS cb(b);
+ OS cc(c);
+ OS cd(d);
+ OS ce(e);
+
+ OS oa;
+ OS ob = absl::nullopt;
+ OS oc = std::string(n, 'c');
+ std::string sod(n, 'd');
+ OS od = sod;
+ OS oe(absl::in_place, n, 'e');
+ OS of;
+ of.emplace(n, 'f');
+
+ OS ma(std::move(oa));
+ OS mb(std::move(ob));
+ OS mc(std::move(oc));
+ OS md(std::move(od));
+ OS me(std::move(oe));
+ OS mf(std::move(of));
+
+ OS aa1;
+ OS ab1 = absl::nullopt;
+ OS ac1 = std::string(n, 'c');
+ std::string sad1(n, 'd');
+ OS ad1 = sad1;
+ OS ae1(absl::in_place, n, 'e');
+ OS af1;
+ af1.emplace(n, 'f');
+
+ OS aa2;
+ OS ab2 = absl::nullopt;
+ OS ac2 = std::string(n, 'c');
+ std::string sad2(n, 'd');
+ OS ad2 = sad2;
+ OS ae2(absl::in_place, n, 'e');
+ OS af2;
+ af2.emplace(n, 'f');
+
+ aa1 = af2;
+ ab1 = ae2;
+ ac1 = ad2;
+ ad1 = ac2;
+ ae1 = ab2;
+ af1 = aa2;
+
+ OS aa3;
+ OS ab3 = absl::nullopt;
+ OS ac3 = std::string(n, 'c');
+ std::string sad3(n, 'd');
+ OS ad3 = sad3;
+ OS ae3(absl::in_place, n, 'e');
+ OS af3;
+ af3.emplace(n, 'f');
+
+ aa3 = absl::nullopt;
+ ab3 = absl::nullopt;
+ ac3 = absl::nullopt;
+ ad3 = absl::nullopt;
+ ae3 = absl::nullopt;
+ af3 = absl::nullopt;
+
+ OS aa4;
+ OS ab4 = absl::nullopt;
+ OS ac4 = std::string(n, 'c');
+ std::string sad4(n, 'd');
+ OS ad4 = sad4;
+ OS ae4(absl::in_place, n, 'e');
+ OS af4;
+ af4.emplace(n, 'f');
+
+ aa4 = OS(absl::in_place, n, 'a');
+ ab4 = OS(absl::in_place, n, 'b');
+ ac4 = OS(absl::in_place, n, 'c');
+ ad4 = OS(absl::in_place, n, 'd');
+ ae4 = OS(absl::in_place, n, 'e');
+ af4 = OS(absl::in_place, n, 'f');
+
+ OS aa5;
+ OS ab5 = absl::nullopt;
+ OS ac5 = std::string(n, 'c');
+ std::string sad5(n, 'd');
+ OS ad5 = sad5;
+ OS ae5(absl::in_place, n, 'e');
+ OS af5;
+ af5.emplace(n, 'f');
+
+ std::string saa5(n, 'a');
+ std::string sab5(n, 'a');
+ std::string sac5(n, 'a');
+ std::string sad52(n, 'a');
+ std::string sae5(n, 'a');
+ std::string saf5(n, 'a');
+
+ aa5 = saa5;
+ ab5 = sab5;
+ ac5 = sac5;
+ ad5 = sad52;
+ ae5 = sae5;
+ af5 = saf5;
+
+ OS aa6;
+ OS ab6 = absl::nullopt;
+ OS ac6 = std::string(n, 'c');
+ std::string sad6(n, 'd');
+ OS ad6 = sad6;
+ OS ae6(absl::in_place, n, 'e');
+ OS af6;
+ af6.emplace(n, 'f');
+
+ aa6 = std::string(n, 'a');
+ ab6 = std::string(n, 'b');
+ ac6 = std::string(n, 'c');
+ ad6 = std::string(n, 'd');
+ ae6 = std::string(n, 'e');
+ af6 = std::string(n, 'f');
+
+ OS aa7;
+ OS ab7 = absl::nullopt;
+ OS ac7 = std::string(n, 'c');
+ std::string sad7(n, 'd');
+ OS ad7 = sad7;
+ OS ae7(absl::in_place, n, 'e');
+ OS af7;
+ af7.emplace(n, 'f');
+
+ aa7.emplace(n, 'A');
+ ab7.emplace(n, 'B');
+ ac7.emplace(n, 'C');
+ ad7.emplace(n, 'D');
+ ae7.emplace(n, 'E');
+ af7.emplace(n, 'F');
+}
+
+TEST(optionalTest, MoveAssignRegression) {
+ StructorListener listener;
+ Listenable::listener = &listener;
+
+ {
+ absl::optional<Listenable> a;
+ Listenable b;
+ a = std::move(b);
+ }
+
+ EXPECT_EQ(1, listener.construct0);
+ EXPECT_EQ(1, listener.move);
+ EXPECT_EQ(2, listener.destruct);
+}
+
+TEST(optionalTest, ValueType) {
+ EXPECT_TRUE((std::is_same<absl::optional<int>::value_type, int>::value));
+ EXPECT_TRUE((std::is_same<absl::optional<std::string>::value_type,
+ std::string>::value));
+ EXPECT_FALSE(
+ (std::is_same<absl::optional<int>::value_type, absl::nullopt_t>::value));
+}
+
+template <typename T>
+struct is_hash_enabled_for {
+ template <typename U, typename = decltype(std::hash<U>()(std::declval<U>()))>
+ static std::true_type test(int);
+
+ template <typename U>
+ static std::false_type test(...);
+
+ static constexpr bool value = decltype(test<T>(0))::value;
+};
+
+TEST(optionalTest, Hash) {
+ std::hash<absl::optional<int>> hash;
+ std::set<size_t> hashcodes;
+ hashcodes.insert(hash(absl::nullopt));
+ for (int i = 0; i < 100; ++i) {
+ hashcodes.insert(hash(i));
+ }
+ EXPECT_GT(hashcodes.size(), 90);
+
+ static_assert(is_hash_enabled_for<absl::optional<int>>::value, "");
+ static_assert(is_hash_enabled_for<absl::optional<Hashable>>::value, "");
+ static_assert(
+ absl::type_traits_internal::IsHashable<absl::optional<int>>::value, "");
+ static_assert(
+ absl::type_traits_internal::IsHashable<absl::optional<Hashable>>::value,
+ "");
+ absl::type_traits_internal::AssertHashEnabled<absl::optional<int>>();
+ absl::type_traits_internal::AssertHashEnabled<absl::optional<Hashable>>();
+
+#if ABSL_META_INTERNAL_STD_HASH_SFINAE_FRIENDLY_
+ static_assert(!is_hash_enabled_for<absl::optional<NonHashable>>::value, "");
+ static_assert(!absl::type_traits_internal::IsHashable<
+ absl::optional<NonHashable>>::value,
+ "");
+#endif
+
+ // libstdc++ std::optional is missing remove_const_t, i.e. it's using
+ // std::hash<T> rather than std::hash<std::remove_const_t<T>>.
+ // Reference: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82262
+#ifndef __GLIBCXX__
+ static_assert(is_hash_enabled_for<absl::optional<const int>>::value, "");
+ static_assert(is_hash_enabled_for<absl::optional<const Hashable>>::value, "");
+ std::hash<absl::optional<const int>> c_hash;
+ for (int i = 0; i < 100; ++i) {
+ EXPECT_EQ(hash(i), c_hash(i));
+ }
+#endif
+}
+
+struct MoveMeNoThrow {
+ MoveMeNoThrow() : x(0) {}
+ [[noreturn]] MoveMeNoThrow(const MoveMeNoThrow& other) : x(other.x) {
+ ABSL_RAW_LOG(FATAL, "Should not be called.");
+ abort();
+ }
+ MoveMeNoThrow(MoveMeNoThrow&& other) noexcept : x(other.x) {}
+ int x;
+};
+
+struct MoveMeThrow {
+ MoveMeThrow() : x(0) {}
+ MoveMeThrow(const MoveMeThrow& other) : x(other.x) {}
+ MoveMeThrow(MoveMeThrow&& other) : x(other.x) {}
+ int x;
+};
+
+TEST(optionalTest, NoExcept) {
+ static_assert(
+ std::is_nothrow_move_constructible<absl::optional<MoveMeNoThrow>>::value,
+ "");
+#ifndef ABSL_USES_STD_OPTIONAL
+ static_assert(absl::default_allocator_is_nothrow::value ==
+ std::is_nothrow_move_constructible<
+ absl::optional<MoveMeThrow>>::value,
+ "");
+#endif
+ std::vector<absl::optional<MoveMeNoThrow>> v;
+ for (int i = 0; i < 10; ++i) v.emplace_back();
+}
+
+struct AnyLike {
+ AnyLike(AnyLike&&) = default;
+ AnyLike(const AnyLike&) = default;
+
+ template <typename ValueType,
+ typename T = typename std::decay<ValueType>::type,
+ typename std::enable_if<
+ !absl::disjunction<
+ std::is_same<AnyLike, T>,
+ absl::negation<std::is_copy_constructible<T>>>::value,
+ int>::type = 0>
+ AnyLike(ValueType&&) {} // NOLINT(runtime/explicit)
+
+ AnyLike& operator=(AnyLike&&) = default;
+ AnyLike& operator=(const AnyLike&) = default;
+
+ template <typename ValueType,
+ typename T = typename std::decay<ValueType>::type>
+ typename std::enable_if<
+ absl::conjunction<absl::negation<std::is_same<AnyLike, T>>,
+ std::is_copy_constructible<T>>::value,
+ AnyLike&>::type
+ operator=(ValueType&& /* rhs */) {
+ return *this;
+ }
+};
+
+TEST(optionalTest, ConstructionConstraints) {
+ EXPECT_TRUE((std::is_constructible<AnyLike, absl::optional<AnyLike>>::value));
+
+ EXPECT_TRUE(
+ (std::is_constructible<AnyLike, const absl::optional<AnyLike>&>::value));
+
+ EXPECT_TRUE((std::is_constructible<absl::optional<AnyLike>, AnyLike>::value));
+ EXPECT_TRUE(
+ (std::is_constructible<absl::optional<AnyLike>, const AnyLike&>::value));
+
+ EXPECT_TRUE((std::is_convertible<absl::optional<AnyLike>, AnyLike>::value));
+
+ EXPECT_TRUE(
+ (std::is_convertible<const absl::optional<AnyLike>&, AnyLike>::value));
+
+ EXPECT_TRUE((std::is_convertible<AnyLike, absl::optional<AnyLike>>::value));
+ EXPECT_TRUE(
+ (std::is_convertible<const AnyLike&, absl::optional<AnyLike>>::value));
+
+ EXPECT_TRUE(std::is_move_constructible<absl::optional<AnyLike>>::value);
+ EXPECT_TRUE(std::is_copy_constructible<absl::optional<AnyLike>>::value);
+}
+
+TEST(optionalTest, AssignmentConstraints) {
+ EXPECT_TRUE((std::is_assignable<AnyLike&, absl::optional<AnyLike>>::value));
+ EXPECT_TRUE(
+ (std::is_assignable<AnyLike&, const absl::optional<AnyLike>&>::value));
+ EXPECT_TRUE((std::is_assignable<absl::optional<AnyLike>&, AnyLike>::value));
+ EXPECT_TRUE(
+ (std::is_assignable<absl::optional<AnyLike>&, const AnyLike&>::value));
+ EXPECT_TRUE(std::is_move_assignable<absl::optional<AnyLike>>::value);
+ EXPECT_TRUE(absl::is_copy_assignable<absl::optional<AnyLike>>::value);
+}
+
+#if !defined(__EMSCRIPTEN__)
+struct NestedClassBug {
+ struct Inner {
+ bool dummy = false;
+ };
+ absl::optional<Inner> value;
+};
+
+TEST(optionalTest, InPlaceTSFINAEBug) {
+ NestedClassBug b;
+ ((void)b);
+ using Inner = NestedClassBug::Inner;
+
+ EXPECT_TRUE((std::is_default_constructible<Inner>::value));
+ EXPECT_TRUE((std::is_constructible<Inner>::value));
+ EXPECT_TRUE(
+ (std::is_constructible<absl::optional<Inner>, absl::in_place_t>::value));
+
+ absl::optional<Inner> o(absl::in_place);
+ EXPECT_TRUE(o.has_value());
+ o.emplace();
+ EXPECT_TRUE(o.has_value());
+}
+#endif // !defined(__EMSCRIPTEN__)
+
+} // namespace
+
+#endif // #if !defined(ABSL_USES_STD_OPTIONAL)
diff --git a/third_party/abseil/src/absl/types/span.h b/third_party/abseil/src/absl/types/span.h
new file mode 100644
index 0000000..95fe792
--- /dev/null
+++ b/third_party/abseil/src/absl/types/span.h
@@ -0,0 +1,726 @@
+//
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// span.h
+// -----------------------------------------------------------------------------
+//
+// This header file defines a `Span<T>` type for holding a reference to existing
+// array data. The `Span` object, much like the `absl::string_view` object,
+// does not own such data itself, and the data being referenced by the span must
+// outlive the span itself. Unlike `view` type references, a span can hold a
+// reference to mutable data (and can mutate it for underlying types of
+// non-const T.) A span provides a lightweight way to pass a reference to such
+// data.
+//
+// Additionally, this header file defines `MakeSpan()` and `MakeConstSpan()`
+// factory functions, for clearly creating spans of type `Span<T>` or read-only
+// `Span<const T>` when such types may be difficult to identify due to issues
+// with implicit conversion.
+//
+// The C++20 draft standard includes a `std::span` type. As of June 2020, the
+// differences between `absl::Span` and `std::span` are:
+// * `absl::Span` has `operator==` (which is likely a design bug,
+// per https://abseil.io/blog/20180531-regular-types)
+// * `absl::Span` has the factory functions `MakeSpan()` and
+// `MakeConstSpan()`
+// * bounds-checked access to `absl::Span` is accomplished with `at()`
+// * `absl::Span` has compiler-provided move and copy constructors and
+// assignment. This is due to them being specified as `constexpr`, but that
+// implies const in C++11.
+// * `absl::Span` has no `element_type` typedef
+// * A read-only `absl::Span<const T>` can be implicitly constructed from an
+// initializer list.
+// * `absl::Span` has no `bytes()`, `size_bytes()`, `as_bytes()`, or
+// `as_mutable_bytes()` methods
+// * `absl::Span` has no static extent template parameter, nor constructors
+// which exist only because of the static extent parameter.
+// * `absl::Span` has an explicit mutable-reference constructor
+//
+// For more information, see the class comments below.
+#ifndef ABSL_TYPES_SPAN_H_
+#define ABSL_TYPES_SPAN_H_
+
+#include <algorithm>
+#include <cassert>
+#include <cstddef>
+#include <initializer_list>
+#include <iterator>
+#include <type_traits>
+#include <utility>
+
+#include "absl/base/internal/throw_delegate.h"
+#include "absl/base/macros.h"
+#include "absl/base/optimization.h"
+#include "absl/base/port.h" // TODO(strel): remove this include
+#include "absl/meta/type_traits.h"
+#include "absl/types/internal/span.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+//------------------------------------------------------------------------------
+// Span
+//------------------------------------------------------------------------------
+//
+// A `Span` is an "array reference" type for holding a reference of contiguous
+// array data; the `Span` object does not and cannot own such data itself. A
+// span provides an easy way to provide overloads for anything operating on
+// contiguous sequences without needing to manage pointers and array lengths
+// manually.
+
+// A span is conceptually a pointer (ptr) and a length (size) into an already
+// existing array of contiguous memory; the array it represents references the
+// elements "ptr[0] .. ptr[size-1]". Passing a properly-constructed `Span`
+// instead of raw pointers avoids many issues related to index out of bounds
+// errors.
+//
+// Spans may also be constructed from containers holding contiguous sequences.
+// Such containers must supply `data()` and `size() const` methods (e.g
+// `std::vector<T>`, `absl::InlinedVector<T, N>`). All implicit conversions to
+// `absl::Span` from such containers will create spans of type `const T`;
+// spans which can mutate their values (of type `T`) must use explicit
+// constructors.
+//
+// A `Span<T>` is somewhat analogous to an `absl::string_view`, but for an array
+// of elements of type `T`, and unlike an `absl::string_view`, a span can hold a
+// reference to mutable data. A user of `Span` must ensure that the data being
+// pointed to outlives the `Span` itself.
+//
+// You can construct a `Span<T>` in several ways:
+//
+// * Explicitly from a reference to a container type
+// * Explicitly from a pointer and size
+// * Implicitly from a container type (but only for spans of type `const T`)
+// * Using the `MakeSpan()` or `MakeConstSpan()` factory functions.
+//
+// Examples:
+//
+// // Construct a Span explicitly from a container:
+// std::vector<int> v = {1, 2, 3, 4, 5};
+// auto span = absl::Span<const int>(v);
+//
+// // Construct a Span explicitly from a C-style array:
+// int a[5] = {1, 2, 3, 4, 5};
+// auto span = absl::Span<const int>(a);
+//
+// // Construct a Span implicitly from a container
+// void MyRoutine(absl::Span<const int> a) {
+// ...
+// }
+// std::vector v = {1,2,3,4,5};
+// MyRoutine(v) // convert to Span<const T>
+//
+// Note that `Span` objects, in addition to requiring that the memory they
+// point to remains alive, must also ensure that such memory does not get
+// reallocated. Therefore, to avoid undefined behavior, containers with
+// associated spans should not invoke operations that may reallocate memory
+// (such as resizing) or invalidate iterators into the container.
+//
+// One common use for a `Span` is when passing arguments to a routine that can
+// accept a variety of array types (e.g. a `std::vector`, `absl::InlinedVector`,
+// a C-style array, etc.). Instead of creating overloads for each case, you
+// can simply specify a `Span` as the argument to such a routine.
+//
+// Example:
+//
+// void MyRoutine(absl::Span<const int> a) {
+// ...
+// }
+//
+// std::vector v = {1,2,3,4,5};
+// MyRoutine(v);
+//
+// absl::InlinedVector<int, 4> my_inline_vector;
+// MyRoutine(my_inline_vector);
+//
+// // Explicit constructor from pointer,size
+// int* my_array = new int[10];
+// MyRoutine(absl::Span<const int>(my_array, 10));
+template <typename T>
+class Span {
+ private:
+ // Used to determine whether a Span can be constructed from a container of
+ // type C.
+ template <typename C>
+ using EnableIfConvertibleFrom =
+ typename std::enable_if<span_internal::HasData<T, C>::value &&
+ span_internal::HasSize<C>::value>::type;
+
+ // Used to SFINAE-enable a function when the slice elements are const.
+ template <typename U>
+ using EnableIfConstView =
+ typename std::enable_if<std::is_const<T>::value, U>::type;
+
+ // Used to SFINAE-enable a function when the slice elements are mutable.
+ template <typename U>
+ using EnableIfMutableView =
+ typename std::enable_if<!std::is_const<T>::value, U>::type;
+
+ public:
+ using value_type = absl::remove_cv_t<T>;
+ using pointer = T*;
+ using const_pointer = const T*;
+ using reference = T&;
+ using const_reference = const T&;
+ using iterator = pointer;
+ using const_iterator = const_pointer;
+ using reverse_iterator = std::reverse_iterator<iterator>;
+ using const_reverse_iterator = std::reverse_iterator<const_iterator>;
+ using size_type = size_t;
+ using difference_type = ptrdiff_t;
+
+ static const size_type npos = ~(size_type(0));
+
+ constexpr Span() noexcept : Span(nullptr, 0) {}
+ constexpr Span(pointer array, size_type length) noexcept
+ : ptr_(array), len_(length) {}
+
+ // Implicit conversion constructors
+ template <size_t N>
+ constexpr Span(T (&a)[N]) noexcept // NOLINT(runtime/explicit)
+ : Span(a, N) {}
+
+ // Explicit reference constructor for a mutable `Span<T>` type. Can be
+ // replaced with MakeSpan() to infer the type parameter.
+ template <typename V, typename = EnableIfConvertibleFrom<V>,
+ typename = EnableIfMutableView<V>>
+ explicit Span(V& v) noexcept // NOLINT(runtime/references)
+ : Span(span_internal::GetData(v), v.size()) {}
+
+ // Implicit reference constructor for a read-only `Span<const T>` type
+ template <typename V, typename = EnableIfConvertibleFrom<V>,
+ typename = EnableIfConstView<V>>
+ constexpr Span(const V& v) noexcept // NOLINT(runtime/explicit)
+ : Span(span_internal::GetData(v), v.size()) {}
+
+ // Implicit constructor from an initializer list, making it possible to pass a
+ // brace-enclosed initializer list to a function expecting a `Span`. Such
+ // spans constructed from an initializer list must be of type `Span<const T>`.
+ //
+ // void Process(absl::Span<const int> x);
+ // Process({1, 2, 3});
+ //
+ // Note that as always the array referenced by the span must outlive the span.
+ // Since an initializer list constructor acts as if it is fed a temporary
+ // array (cf. C++ standard [dcl.init.list]/5), it's safe to use this
+ // constructor only when the `std::initializer_list` itself outlives the span.
+ // In order to meet this requirement it's sufficient to ensure that neither
+ // the span nor a copy of it is used outside of the expression in which it's
+ // created:
+ //
+ // // Assume that this function uses the array directly, not retaining any
+ // // copy of the span or pointer to any of its elements.
+ // void Process(absl::Span<const int> ints);
+ //
+ // // Okay: the std::initializer_list<int> will reference a temporary array
+ // // that isn't destroyed until after the call to Process returns.
+ // Process({ 17, 19 });
+ //
+ // // Not okay: the storage used by the std::initializer_list<int> is not
+ // // allowed to be referenced after the first line.
+ // absl::Span<const int> ints = { 17, 19 };
+ // Process(ints);
+ //
+ // // Not okay for the same reason as above: even when the elements of the
+ // // initializer list expression are not temporaries the underlying array
+ // // is, so the initializer list must still outlive the span.
+ // const int foo = 17;
+ // absl::Span<const int> ints = { foo };
+ // Process(ints);
+ //
+ template <typename LazyT = T,
+ typename = EnableIfConstView<LazyT>>
+ Span(
+ std::initializer_list<value_type> v) noexcept // NOLINT(runtime/explicit)
+ : Span(v.begin(), v.size()) {}
+
+ // Accessors
+
+ // Span::data()
+ //
+ // Returns a pointer to the span's underlying array of data (which is held
+ // outside the span).
+ constexpr pointer data() const noexcept { return ptr_; }
+
+ // Span::size()
+ //
+ // Returns the size of this span.
+ constexpr size_type size() const noexcept { return len_; }
+
+ // Span::length()
+ //
+ // Returns the length (size) of this span.
+ constexpr size_type length() const noexcept { return size(); }
+
+ // Span::empty()
+ //
+ // Returns a boolean indicating whether or not this span is considered empty.
+ constexpr bool empty() const noexcept { return size() == 0; }
+
+ // Span::operator[]
+ //
+ // Returns a reference to the i'th element of this span.
+ constexpr reference operator[](size_type i) const noexcept {
+ // MSVC 2015 accepts this as constexpr, but not ptr_[i]
+ return ABSL_HARDENING_ASSERT(i < size()), *(data() + i);
+ }
+
+ // Span::at()
+ //
+ // Returns a reference to the i'th element of this span.
+ constexpr reference at(size_type i) const {
+ return ABSL_PREDICT_TRUE(i < size()) //
+ ? *(data() + i)
+ : (base_internal::ThrowStdOutOfRange(
+ "Span::at failed bounds check"),
+ *(data() + i));
+ }
+
+ // Span::front()
+ //
+ // Returns a reference to the first element of this span. The span must not
+ // be empty.
+ constexpr reference front() const noexcept {
+ return ABSL_HARDENING_ASSERT(size() > 0), *data();
+ }
+
+ // Span::back()
+ //
+ // Returns a reference to the last element of this span. The span must not
+ // be empty.
+ constexpr reference back() const noexcept {
+ return ABSL_HARDENING_ASSERT(size() > 0), *(data() + size() - 1);
+ }
+
+ // Span::begin()
+ //
+ // Returns an iterator pointing to the first element of this span, or `end()`
+ // if the span is empty.
+ constexpr iterator begin() const noexcept { return data(); }
+
+ // Span::cbegin()
+ //
+ // Returns a const iterator pointing to the first element of this span, or
+ // `end()` if the span is empty.
+ constexpr const_iterator cbegin() const noexcept { return begin(); }
+
+ // Span::end()
+ //
+ // Returns an iterator pointing just beyond the last element at the
+ // end of this span. This iterator acts as a placeholder; attempting to
+ // access it results in undefined behavior.
+ constexpr iterator end() const noexcept { return data() + size(); }
+
+ // Span::cend()
+ //
+ // Returns a const iterator pointing just beyond the last element at the
+ // end of this span. This iterator acts as a placeholder; attempting to
+ // access it results in undefined behavior.
+ constexpr const_iterator cend() const noexcept { return end(); }
+
+ // Span::rbegin()
+ //
+ // Returns a reverse iterator pointing to the last element at the end of this
+ // span, or `rend()` if the span is empty.
+ constexpr reverse_iterator rbegin() const noexcept {
+ return reverse_iterator(end());
+ }
+
+ // Span::crbegin()
+ //
+ // Returns a const reverse iterator pointing to the last element at the end of
+ // this span, or `crend()` if the span is empty.
+ constexpr const_reverse_iterator crbegin() const noexcept { return rbegin(); }
+
+ // Span::rend()
+ //
+ // Returns a reverse iterator pointing just before the first element
+ // at the beginning of this span. This pointer acts as a placeholder;
+ // attempting to access its element results in undefined behavior.
+ constexpr reverse_iterator rend() const noexcept {
+ return reverse_iterator(begin());
+ }
+
+ // Span::crend()
+ //
+ // Returns a reverse const iterator pointing just before the first element
+ // at the beginning of this span. This pointer acts as a placeholder;
+ // attempting to access its element results in undefined behavior.
+ constexpr const_reverse_iterator crend() const noexcept { return rend(); }
+
+ // Span mutations
+
+ // Span::remove_prefix()
+ //
+ // Removes the first `n` elements from the span.
+ void remove_prefix(size_type n) noexcept {
+ ABSL_HARDENING_ASSERT(size() >= n);
+ ptr_ += n;
+ len_ -= n;
+ }
+
+ // Span::remove_suffix()
+ //
+ // Removes the last `n` elements from the span.
+ void remove_suffix(size_type n) noexcept {
+ ABSL_HARDENING_ASSERT(size() >= n);
+ len_ -= n;
+ }
+
+ // Span::subspan()
+ //
+ // Returns a `Span` starting at element `pos` and of length `len`. Both `pos`
+ // and `len` are of type `size_type` and thus non-negative. Parameter `pos`
+ // must be <= size(). Any `len` value that points past the end of the span
+ // will be trimmed to at most size() - `pos`. A default `len` value of `npos`
+ // ensures the returned subspan continues until the end of the span.
+ //
+ // Examples:
+ //
+ // std::vector<int> vec = {10, 11, 12, 13};
+ // absl::MakeSpan(vec).subspan(1, 2); // {11, 12}
+ // absl::MakeSpan(vec).subspan(2, 8); // {12, 13}
+ // absl::MakeSpan(vec).subspan(1); // {11, 12, 13}
+ // absl::MakeSpan(vec).subspan(4); // {}
+ // absl::MakeSpan(vec).subspan(5); // throws std::out_of_range
+ constexpr Span subspan(size_type pos = 0, size_type len = npos) const {
+ return (pos <= size())
+ ? Span(data() + pos, span_internal::Min(size() - pos, len))
+ : (base_internal::ThrowStdOutOfRange("pos > size()"), Span());
+ }
+
+ // Span::first()
+ //
+ // Returns a `Span` containing first `len` elements. Parameter `len` is of
+ // type `size_type` and thus non-negative. `len` value must be <= size().
+ //
+ // Examples:
+ //
+ // std::vector<int> vec = {10, 11, 12, 13};
+ // absl::MakeSpan(vec).first(1); // {10}
+ // absl::MakeSpan(vec).first(3); // {10, 11, 12}
+ // absl::MakeSpan(vec).first(5); // throws std::out_of_range
+ constexpr Span first(size_type len) const {
+ return (len <= size())
+ ? Span(data(), len)
+ : (base_internal::ThrowStdOutOfRange("len > size()"), Span());
+ }
+
+ // Span::last()
+ //
+ // Returns a `Span` containing last `len` elements. Parameter `len` is of
+ // type `size_type` and thus non-negative. `len` value must be <= size().
+ //
+ // Examples:
+ //
+ // std::vector<int> vec = {10, 11, 12, 13};
+ // absl::MakeSpan(vec).last(1); // {13}
+ // absl::MakeSpan(vec).last(3); // {11, 12, 13}
+ // absl::MakeSpan(vec).last(5); // throws std::out_of_range
+ constexpr Span last(size_type len) const {
+ return (len <= size())
+ ? Span(size() - len + data(), len)
+ : (base_internal::ThrowStdOutOfRange("len > size()"), Span());
+ }
+
+ // Support for absl::Hash.
+ template <typename H>
+ friend H AbslHashValue(H h, Span v) {
+ return H::combine(H::combine_contiguous(std::move(h), v.data(), v.size()),
+ v.size());
+ }
+
+ private:
+ pointer ptr_;
+ size_type len_;
+};
+
+template <typename T>
+const typename Span<T>::size_type Span<T>::npos;
+
+// Span relationals
+
+// Equality is compared element-by-element, while ordering is lexicographical.
+// We provide three overloads for each operator to cover any combination on the
+// left or right hand side of mutable Span<T>, read-only Span<const T>, and
+// convertible-to-read-only Span<T>.
+// TODO(zhangxy): Due to MSVC overload resolution bug with partial ordering
+// template functions, 5 overloads per operator is needed as a workaround. We
+// should update them to 3 overloads per operator using non-deduced context like
+// string_view, i.e.
+// - (Span<T>, Span<T>)
+// - (Span<T>, non_deduced<Span<const T>>)
+// - (non_deduced<Span<const T>>, Span<T>)
+
+// operator==
+template <typename T>
+bool operator==(Span<T> a, Span<T> b) {
+ return span_internal::EqualImpl<Span, const T>(a, b);
+}
+template <typename T>
+bool operator==(Span<const T> a, Span<T> b) {
+ return span_internal::EqualImpl<Span, const T>(a, b);
+}
+template <typename T>
+bool operator==(Span<T> a, Span<const T> b) {
+ return span_internal::EqualImpl<Span, const T>(a, b);
+}
+template <
+ typename T, typename U,
+ typename = span_internal::EnableIfConvertibleTo<U, absl::Span<const T>>>
+bool operator==(const U& a, Span<T> b) {
+ return span_internal::EqualImpl<Span, const T>(a, b);
+}
+template <
+ typename T, typename U,
+ typename = span_internal::EnableIfConvertibleTo<U, absl::Span<const T>>>
+bool operator==(Span<T> a, const U& b) {
+ return span_internal::EqualImpl<Span, const T>(a, b);
+}
+
+// operator!=
+template <typename T>
+bool operator!=(Span<T> a, Span<T> b) {
+ return !(a == b);
+}
+template <typename T>
+bool operator!=(Span<const T> a, Span<T> b) {
+ return !(a == b);
+}
+template <typename T>
+bool operator!=(Span<T> a, Span<const T> b) {
+ return !(a == b);
+}
+template <
+ typename T, typename U,
+ typename = span_internal::EnableIfConvertibleTo<U, absl::Span<const T>>>
+bool operator!=(const U& a, Span<T> b) {
+ return !(a == b);
+}
+template <
+ typename T, typename U,
+ typename = span_internal::EnableIfConvertibleTo<U, absl::Span<const T>>>
+bool operator!=(Span<T> a, const U& b) {
+ return !(a == b);
+}
+
+// operator<
+template <typename T>
+bool operator<(Span<T> a, Span<T> b) {
+ return span_internal::LessThanImpl<Span, const T>(a, b);
+}
+template <typename T>
+bool operator<(Span<const T> a, Span<T> b) {
+ return span_internal::LessThanImpl<Span, const T>(a, b);
+}
+template <typename T>
+bool operator<(Span<T> a, Span<const T> b) {
+ return span_internal::LessThanImpl<Span, const T>(a, b);
+}
+template <
+ typename T, typename U,
+ typename = span_internal::EnableIfConvertibleTo<U, absl::Span<const T>>>
+bool operator<(const U& a, Span<T> b) {
+ return span_internal::LessThanImpl<Span, const T>(a, b);
+}
+template <
+ typename T, typename U,
+ typename = span_internal::EnableIfConvertibleTo<U, absl::Span<const T>>>
+bool operator<(Span<T> a, const U& b) {
+ return span_internal::LessThanImpl<Span, const T>(a, b);
+}
+
+// operator>
+template <typename T>
+bool operator>(Span<T> a, Span<T> b) {
+ return b < a;
+}
+template <typename T>
+bool operator>(Span<const T> a, Span<T> b) {
+ return b < a;
+}
+template <typename T>
+bool operator>(Span<T> a, Span<const T> b) {
+ return b < a;
+}
+template <
+ typename T, typename U,
+ typename = span_internal::EnableIfConvertibleTo<U, absl::Span<const T>>>
+bool operator>(const U& a, Span<T> b) {
+ return b < a;
+}
+template <
+ typename T, typename U,
+ typename = span_internal::EnableIfConvertibleTo<U, absl::Span<const T>>>
+bool operator>(Span<T> a, const U& b) {
+ return b < a;
+}
+
+// operator<=
+template <typename T>
+bool operator<=(Span<T> a, Span<T> b) {
+ return !(b < a);
+}
+template <typename T>
+bool operator<=(Span<const T> a, Span<T> b) {
+ return !(b < a);
+}
+template <typename T>
+bool operator<=(Span<T> a, Span<const T> b) {
+ return !(b < a);
+}
+template <
+ typename T, typename U,
+ typename = span_internal::EnableIfConvertibleTo<U, absl::Span<const T>>>
+bool operator<=(const U& a, Span<T> b) {
+ return !(b < a);
+}
+template <
+ typename T, typename U,
+ typename = span_internal::EnableIfConvertibleTo<U, absl::Span<const T>>>
+bool operator<=(Span<T> a, const U& b) {
+ return !(b < a);
+}
+
+// operator>=
+template <typename T>
+bool operator>=(Span<T> a, Span<T> b) {
+ return !(a < b);
+}
+template <typename T>
+bool operator>=(Span<const T> a, Span<T> b) {
+ return !(a < b);
+}
+template <typename T>
+bool operator>=(Span<T> a, Span<const T> b) {
+ return !(a < b);
+}
+template <
+ typename T, typename U,
+ typename = span_internal::EnableIfConvertibleTo<U, absl::Span<const T>>>
+bool operator>=(const U& a, Span<T> b) {
+ return !(a < b);
+}
+template <
+ typename T, typename U,
+ typename = span_internal::EnableIfConvertibleTo<U, absl::Span<const T>>>
+bool operator>=(Span<T> a, const U& b) {
+ return !(a < b);
+}
+
+// MakeSpan()
+//
+// Constructs a mutable `Span<T>`, deducing `T` automatically from either a
+// container or pointer+size.
+//
+// Because a read-only `Span<const T>` is implicitly constructed from container
+// types regardless of whether the container itself is a const container,
+// constructing mutable spans of type `Span<T>` from containers requires
+// explicit constructors. The container-accepting version of `MakeSpan()`
+// deduces the type of `T` by the constness of the pointer received from the
+// container's `data()` member. Similarly, the pointer-accepting version returns
+// a `Span<const T>` if `T` is `const`, and a `Span<T>` otherwise.
+//
+// Examples:
+//
+// void MyRoutine(absl::Span<MyComplicatedType> a) {
+// ...
+// };
+// // my_vector is a container of non-const types
+// std::vector<MyComplicatedType> my_vector;
+//
+// // Constructing a Span implicitly attempts to create a Span of type
+// // `Span<const T>`
+// MyRoutine(my_vector); // error, type mismatch
+//
+// // Explicitly constructing the Span is verbose
+// MyRoutine(absl::Span<MyComplicatedType>(my_vector));
+//
+// // Use MakeSpan() to make an absl::Span<T>
+// MyRoutine(absl::MakeSpan(my_vector));
+//
+// // Construct a span from an array ptr+size
+// absl::Span<T> my_span() {
+// return absl::MakeSpan(&array[0], num_elements_);
+// }
+//
+template <int&... ExplicitArgumentBarrier, typename T>
+constexpr Span<T> MakeSpan(T* ptr, size_t size) noexcept {
+ return Span<T>(ptr, size);
+}
+
+template <int&... ExplicitArgumentBarrier, typename T>
+Span<T> MakeSpan(T* begin, T* end) noexcept {
+ return ABSL_HARDENING_ASSERT(begin <= end), Span<T>(begin, end - begin);
+}
+
+template <int&... ExplicitArgumentBarrier, typename C>
+constexpr auto MakeSpan(C& c) noexcept // NOLINT(runtime/references)
+ -> decltype(absl::MakeSpan(span_internal::GetData(c), c.size())) {
+ return MakeSpan(span_internal::GetData(c), c.size());
+}
+
+template <int&... ExplicitArgumentBarrier, typename T, size_t N>
+constexpr Span<T> MakeSpan(T (&array)[N]) noexcept {
+ return Span<T>(array, N);
+}
+
+// MakeConstSpan()
+//
+// Constructs a `Span<const T>` as with `MakeSpan`, deducing `T` automatically,
+// but always returning a `Span<const T>`.
+//
+// Examples:
+//
+// void ProcessInts(absl::Span<const int> some_ints);
+//
+// // Call with a pointer and size.
+// int array[3] = { 0, 0, 0 };
+// ProcessInts(absl::MakeConstSpan(&array[0], 3));
+//
+// // Call with a [begin, end) pair.
+// ProcessInts(absl::MakeConstSpan(&array[0], &array[3]));
+//
+// // Call directly with an array.
+// ProcessInts(absl::MakeConstSpan(array));
+//
+// // Call with a contiguous container.
+// std::vector<int> some_ints = ...;
+// ProcessInts(absl::MakeConstSpan(some_ints));
+// ProcessInts(absl::MakeConstSpan(std::vector<int>{ 0, 0, 0 }));
+//
+template <int&... ExplicitArgumentBarrier, typename T>
+constexpr Span<const T> MakeConstSpan(T* ptr, size_t size) noexcept {
+ return Span<const T>(ptr, size);
+}
+
+template <int&... ExplicitArgumentBarrier, typename T>
+Span<const T> MakeConstSpan(T* begin, T* end) noexcept {
+ return ABSL_HARDENING_ASSERT(begin <= end), Span<const T>(begin, end - begin);
+}
+
+template <int&... ExplicitArgumentBarrier, typename C>
+constexpr auto MakeConstSpan(const C& c) noexcept -> decltype(MakeSpan(c)) {
+ return MakeSpan(c);
+}
+
+template <int&... ExplicitArgumentBarrier, typename T, size_t N>
+constexpr Span<const T> MakeConstSpan(const T (&array)[N]) noexcept {
+ return Span<const T>(array, N);
+}
+ABSL_NAMESPACE_END
+} // namespace absl
+#endif // ABSL_TYPES_SPAN_H_
diff --git a/third_party/abseil/src/absl/types/span_test.cc b/third_party/abseil/src/absl/types/span_test.cc
new file mode 100644
index 0000000..2584339
--- /dev/null
+++ b/third_party/abseil/src/absl/types/span_test.cc
@@ -0,0 +1,846 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/types/span.h"
+
+#include <array>
+#include <initializer_list>
+#include <numeric>
+#include <stdexcept>
+#include <string>
+#include <type_traits>
+#include <vector>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/base/attributes.h"
+#include "absl/base/config.h"
+#include "absl/base/internal/exception_testing.h"
+#include "absl/base/options.h"
+#include "absl/container/fixed_array.h"
+#include "absl/container/inlined_vector.h"
+#include "absl/hash/hash_testing.h"
+#include "absl/strings/str_cat.h"
+
+namespace {
+
+MATCHER_P(DataIs, data,
+ absl::StrCat("data() ", negation ? "isn't " : "is ",
+ testing::PrintToString(data))) {
+ return arg.data() == data;
+}
+
+template <typename T>
+auto SpanIs(T data, size_t size)
+ -> decltype(testing::AllOf(DataIs(data), testing::SizeIs(size))) {
+ return testing::AllOf(DataIs(data), testing::SizeIs(size));
+}
+
+template <typename Container>
+auto SpanIs(const Container& c) -> decltype(SpanIs(c.data(), c.size())) {
+ return SpanIs(c.data(), c.size());
+}
+
+std::vector<int> MakeRamp(int len, int offset = 0) {
+ std::vector<int> v(len);
+ std::iota(v.begin(), v.end(), offset);
+ return v;
+}
+
+TEST(IntSpan, EmptyCtors) {
+ absl::Span<int> s;
+ EXPECT_THAT(s, SpanIs(nullptr, 0));
+}
+
+TEST(IntSpan, PtrLenCtor) {
+ int a[] = {1, 2, 3};
+ absl::Span<int> s(&a[0], 2);
+ EXPECT_THAT(s, SpanIs(a, 2));
+}
+
+TEST(IntSpan, ArrayCtor) {
+ int a[] = {1, 2, 3};
+ absl::Span<int> s(a);
+ EXPECT_THAT(s, SpanIs(a, 3));
+
+ EXPECT_TRUE((std::is_constructible<absl::Span<const int>, int[3]>::value));
+ EXPECT_TRUE(
+ (std::is_constructible<absl::Span<const int>, const int[3]>::value));
+ EXPECT_FALSE((std::is_constructible<absl::Span<int>, const int[3]>::value));
+ EXPECT_TRUE((std::is_convertible<int[3], absl::Span<const int>>::value));
+ EXPECT_TRUE(
+ (std::is_convertible<const int[3], absl::Span<const int>>::value));
+}
+
+template <typename T>
+void TakesGenericSpan(absl::Span<T>) {}
+
+TEST(IntSpan, ContainerCtor) {
+ std::vector<int> empty;
+ absl::Span<int> s_empty(empty);
+ EXPECT_THAT(s_empty, SpanIs(empty));
+
+ std::vector<int> filled{1, 2, 3};
+ absl::Span<int> s_filled(filled);
+ EXPECT_THAT(s_filled, SpanIs(filled));
+
+ absl::Span<int> s_from_span(filled);
+ EXPECT_THAT(s_from_span, SpanIs(s_filled));
+
+ absl::Span<const int> const_filled = filled;
+ EXPECT_THAT(const_filled, SpanIs(filled));
+
+ absl::Span<const int> const_from_span = s_filled;
+ EXPECT_THAT(const_from_span, SpanIs(s_filled));
+
+ EXPECT_TRUE(
+ (std::is_convertible<std::vector<int>&, absl::Span<const int>>::value));
+ EXPECT_TRUE(
+ (std::is_convertible<absl::Span<int>&, absl::Span<const int>>::value));
+
+ TakesGenericSpan(absl::Span<int>(filled));
+}
+
+// A struct supplying shallow data() const.
+struct ContainerWithShallowConstData {
+ std::vector<int> storage;
+ int* data() const { return const_cast<int*>(storage.data()); }
+ int size() const { return storage.size(); }
+};
+
+TEST(IntSpan, ShallowConstness) {
+ const ContainerWithShallowConstData c{MakeRamp(20)};
+ absl::Span<int> s(
+ c); // We should be able to do this even though data() is const.
+ s[0] = -1;
+ EXPECT_EQ(c.storage[0], -1);
+}
+
+TEST(CharSpan, StringCtor) {
+ std::string empty = "";
+ absl::Span<char> s_empty(empty);
+ EXPECT_THAT(s_empty, SpanIs(empty));
+
+ std::string abc = "abc";
+ absl::Span<char> s_abc(abc);
+ EXPECT_THAT(s_abc, SpanIs(abc));
+
+ absl::Span<const char> s_const_abc = abc;
+ EXPECT_THAT(s_const_abc, SpanIs(abc));
+
+ EXPECT_FALSE((std::is_constructible<absl::Span<int>, std::string>::value));
+ EXPECT_FALSE(
+ (std::is_constructible<absl::Span<const int>, std::string>::value));
+ EXPECT_TRUE(
+ (std::is_convertible<std::string, absl::Span<const char>>::value));
+}
+
+TEST(IntSpan, FromConstPointer) {
+ EXPECT_TRUE((std::is_constructible<absl::Span<const int* const>,
+ std::vector<int*>>::value));
+ EXPECT_TRUE((std::is_constructible<absl::Span<const int* const>,
+ std::vector<const int*>>::value));
+ EXPECT_FALSE((
+ std::is_constructible<absl::Span<const int*>, std::vector<int*>>::value));
+ EXPECT_FALSE((
+ std::is_constructible<absl::Span<int*>, std::vector<const int*>>::value));
+}
+
+struct TypeWithMisleadingData {
+ int& data() { return i; }
+ int size() { return 1; }
+ int i;
+};
+
+struct TypeWithMisleadingSize {
+ int* data() { return &i; }
+ const char* size() { return "1"; }
+ int i;
+};
+
+TEST(IntSpan, EvilTypes) {
+ EXPECT_FALSE(
+ (std::is_constructible<absl::Span<int>, TypeWithMisleadingData&>::value));
+ EXPECT_FALSE(
+ (std::is_constructible<absl::Span<int>, TypeWithMisleadingSize&>::value));
+}
+
+struct Base {
+ int* data() { return &i; }
+ int size() { return 1; }
+ int i;
+};
+struct Derived : Base {};
+
+TEST(IntSpan, SpanOfDerived) {
+ EXPECT_TRUE((std::is_constructible<absl::Span<int>, Base&>::value));
+ EXPECT_TRUE((std::is_constructible<absl::Span<int>, Derived&>::value));
+ EXPECT_FALSE(
+ (std::is_constructible<absl::Span<Base>, std::vector<Derived>>::value));
+}
+
+void TestInitializerList(absl::Span<const int> s, const std::vector<int>& v) {
+ EXPECT_TRUE(absl::equal(s.begin(), s.end(), v.begin(), v.end()));
+}
+
+TEST(ConstIntSpan, InitializerListConversion) {
+ TestInitializerList({}, {});
+ TestInitializerList({1}, {1});
+ TestInitializerList({1, 2, 3}, {1, 2, 3});
+
+ EXPECT_FALSE((std::is_constructible<absl::Span<int>,
+ std::initializer_list<int>>::value));
+ EXPECT_FALSE((
+ std::is_convertible<absl::Span<int>, std::initializer_list<int>>::value));
+}
+
+TEST(IntSpan, Data) {
+ int i;
+ absl::Span<int> s(&i, 1);
+ EXPECT_EQ(&i, s.data());
+}
+
+TEST(IntSpan, SizeLengthEmpty) {
+ absl::Span<int> empty;
+ EXPECT_EQ(empty.size(), 0);
+ EXPECT_TRUE(empty.empty());
+ EXPECT_EQ(empty.size(), empty.length());
+
+ auto v = MakeRamp(10);
+ absl::Span<int> s(v);
+ EXPECT_EQ(s.size(), 10);
+ EXPECT_FALSE(s.empty());
+ EXPECT_EQ(s.size(), s.length());
+}
+
+TEST(IntSpan, ElementAccess) {
+ auto v = MakeRamp(10);
+ absl::Span<int> s(v);
+ for (int i = 0; i < s.size(); ++i) {
+ EXPECT_EQ(s[i], s.at(i));
+ }
+
+ EXPECT_EQ(s.front(), s[0]);
+ EXPECT_EQ(s.back(), s[9]);
+
+#if !defined(NDEBUG) || ABSL_OPTION_HARDENED
+ EXPECT_DEATH_IF_SUPPORTED(s[-1], "");
+ EXPECT_DEATH_IF_SUPPORTED(s[10], "");
+#endif
+}
+
+TEST(IntSpan, AtThrows) {
+ auto v = MakeRamp(10);
+ absl::Span<int> s(v);
+
+ EXPECT_EQ(s.at(9), 9);
+ ABSL_BASE_INTERNAL_EXPECT_FAIL(s.at(10), std::out_of_range,
+ "failed bounds check");
+}
+
+TEST(IntSpan, RemovePrefixAndSuffix) {
+ auto v = MakeRamp(20, 1);
+ absl::Span<int> s(v);
+ EXPECT_EQ(s.size(), 20);
+
+ s.remove_suffix(0);
+ s.remove_prefix(0);
+ EXPECT_EQ(s.size(), 20);
+
+ s.remove_prefix(1);
+ EXPECT_EQ(s.size(), 19);
+ EXPECT_EQ(s[0], 2);
+
+ s.remove_suffix(1);
+ EXPECT_EQ(s.size(), 18);
+ EXPECT_EQ(s.back(), 19);
+
+ s.remove_prefix(7);
+ EXPECT_EQ(s.size(), 11);
+ EXPECT_EQ(s[0], 9);
+
+ s.remove_suffix(11);
+ EXPECT_EQ(s.size(), 0);
+
+ EXPECT_EQ(v, MakeRamp(20, 1));
+
+#if !defined(NDEBUG) || ABSL_OPTION_HARDENED
+ absl::Span<int> prefix_death(v);
+ EXPECT_DEATH_IF_SUPPORTED(prefix_death.remove_prefix(21), "");
+ absl::Span<int> suffix_death(v);
+ EXPECT_DEATH_IF_SUPPORTED(suffix_death.remove_suffix(21), "");
+#endif
+}
+
+TEST(IntSpan, Subspan) {
+ std::vector<int> empty;
+ EXPECT_EQ(absl::MakeSpan(empty).subspan(), empty);
+ EXPECT_THAT(absl::MakeSpan(empty).subspan(0, 0), SpanIs(empty));
+ EXPECT_THAT(absl::MakeSpan(empty).subspan(0, absl::Span<const int>::npos),
+ SpanIs(empty));
+
+ auto ramp = MakeRamp(10);
+ EXPECT_THAT(absl::MakeSpan(ramp).subspan(), SpanIs(ramp));
+ EXPECT_THAT(absl::MakeSpan(ramp).subspan(0, 10), SpanIs(ramp));
+ EXPECT_THAT(absl::MakeSpan(ramp).subspan(0, absl::Span<const int>::npos),
+ SpanIs(ramp));
+ EXPECT_THAT(absl::MakeSpan(ramp).subspan(0, 3), SpanIs(ramp.data(), 3));
+ EXPECT_THAT(absl::MakeSpan(ramp).subspan(5, absl::Span<const int>::npos),
+ SpanIs(ramp.data() + 5, 5));
+ EXPECT_THAT(absl::MakeSpan(ramp).subspan(3, 3), SpanIs(ramp.data() + 3, 3));
+ EXPECT_THAT(absl::MakeSpan(ramp).subspan(10, 5), SpanIs(ramp.data() + 10, 0));
+
+#ifdef ABSL_HAVE_EXCEPTIONS
+ EXPECT_THROW(absl::MakeSpan(ramp).subspan(11, 5), std::out_of_range);
+#else
+ EXPECT_DEATH_IF_SUPPORTED(absl::MakeSpan(ramp).subspan(11, 5), "");
+#endif
+}
+
+TEST(IntSpan, First) {
+ std::vector<int> empty;
+ EXPECT_THAT(absl::MakeSpan(empty).first(0), SpanIs(empty));
+
+ auto ramp = MakeRamp(10);
+ EXPECT_THAT(absl::MakeSpan(ramp).first(0), SpanIs(ramp.data(), 0));
+ EXPECT_THAT(absl::MakeSpan(ramp).first(10), SpanIs(ramp));
+ EXPECT_THAT(absl::MakeSpan(ramp).first(3), SpanIs(ramp.data(), 3));
+
+#ifdef ABSL_HAVE_EXCEPTIONS
+ EXPECT_THROW(absl::MakeSpan(ramp).first(11), std::out_of_range);
+#else
+ EXPECT_DEATH_IF_SUPPORTED(absl::MakeSpan(ramp).first(11), "");
+#endif
+}
+
+TEST(IntSpan, Last) {
+ std::vector<int> empty;
+ EXPECT_THAT(absl::MakeSpan(empty).last(0), SpanIs(empty));
+
+ auto ramp = MakeRamp(10);
+ EXPECT_THAT(absl::MakeSpan(ramp).last(0), SpanIs(ramp.data() + 10, 0));
+ EXPECT_THAT(absl::MakeSpan(ramp).last(10), SpanIs(ramp));
+ EXPECT_THAT(absl::MakeSpan(ramp).last(3), SpanIs(ramp.data() + 7, 3));
+
+#ifdef ABSL_HAVE_EXCEPTIONS
+ EXPECT_THROW(absl::MakeSpan(ramp).last(11), std::out_of_range);
+#else
+ EXPECT_DEATH_IF_SUPPORTED(absl::MakeSpan(ramp).last(11), "");
+#endif
+}
+
+TEST(IntSpan, MakeSpanPtrLength) {
+ std::vector<int> empty;
+ auto s_empty = absl::MakeSpan(empty.data(), empty.size());
+ EXPECT_THAT(s_empty, SpanIs(empty));
+
+ std::array<int, 3> a{{1, 2, 3}};
+ auto s = absl::MakeSpan(a.data(), a.size());
+ EXPECT_THAT(s, SpanIs(a));
+
+ EXPECT_THAT(absl::MakeConstSpan(empty.data(), empty.size()), SpanIs(s_empty));
+ EXPECT_THAT(absl::MakeConstSpan(a.data(), a.size()), SpanIs(s));
+}
+
+TEST(IntSpan, MakeSpanTwoPtrs) {
+ std::vector<int> empty;
+ auto s_empty = absl::MakeSpan(empty.data(), empty.data());
+ EXPECT_THAT(s_empty, SpanIs(empty));
+
+ std::vector<int> v{1, 2, 3};
+ auto s = absl::MakeSpan(v.data(), v.data() + 1);
+ EXPECT_THAT(s, SpanIs(v.data(), 1));
+
+ EXPECT_THAT(absl::MakeConstSpan(empty.data(), empty.data()), SpanIs(s_empty));
+ EXPECT_THAT(absl::MakeConstSpan(v.data(), v.data() + 1), SpanIs(s));
+}
+
+TEST(IntSpan, MakeSpanContainer) {
+ std::vector<int> empty;
+ auto s_empty = absl::MakeSpan(empty);
+ EXPECT_THAT(s_empty, SpanIs(empty));
+
+ std::vector<int> v{1, 2, 3};
+ auto s = absl::MakeSpan(v);
+ EXPECT_THAT(s, SpanIs(v));
+
+ EXPECT_THAT(absl::MakeConstSpan(empty), SpanIs(s_empty));
+ EXPECT_THAT(absl::MakeConstSpan(v), SpanIs(s));
+
+ EXPECT_THAT(absl::MakeSpan(s), SpanIs(s));
+ EXPECT_THAT(absl::MakeConstSpan(s), SpanIs(s));
+}
+
+TEST(CharSpan, MakeSpanString) {
+ std::string empty = "";
+ auto s_empty = absl::MakeSpan(empty);
+ EXPECT_THAT(s_empty, SpanIs(empty));
+
+ std::string str = "abc";
+ auto s_str = absl::MakeSpan(str);
+ EXPECT_THAT(s_str, SpanIs(str));
+
+ EXPECT_THAT(absl::MakeConstSpan(empty), SpanIs(s_empty));
+ EXPECT_THAT(absl::MakeConstSpan(str), SpanIs(s_str));
+}
+
+TEST(IntSpan, MakeSpanArray) {
+ int a[] = {1, 2, 3};
+ auto s = absl::MakeSpan(a);
+ EXPECT_THAT(s, SpanIs(a, 3));
+
+ const int ca[] = {1, 2, 3};
+ auto s_ca = absl::MakeSpan(ca);
+ EXPECT_THAT(s_ca, SpanIs(ca, 3));
+
+ EXPECT_THAT(absl::MakeConstSpan(a), SpanIs(s));
+ EXPECT_THAT(absl::MakeConstSpan(ca), SpanIs(s_ca));
+}
+
+// Compile-asserts that the argument has the expected decayed type.
+template <typename Expected, typename T>
+void CheckType(const T& /* value */) {
+ testing::StaticAssertTypeEq<Expected, T>();
+}
+
+TEST(IntSpan, MakeSpanTypes) {
+ std::vector<int> vec;
+ const std::vector<int> cvec;
+ int a[1];
+ const int ca[] = {1};
+ int* ip = a;
+ const int* cip = ca;
+ std::string s = "";
+ const std::string cs = "";
+ CheckType<absl::Span<int>>(absl::MakeSpan(vec));
+ CheckType<absl::Span<const int>>(absl::MakeSpan(cvec));
+ CheckType<absl::Span<int>>(absl::MakeSpan(ip, ip + 1));
+ CheckType<absl::Span<int>>(absl::MakeSpan(ip, 1));
+ CheckType<absl::Span<const int>>(absl::MakeSpan(cip, cip + 1));
+ CheckType<absl::Span<const int>>(absl::MakeSpan(cip, 1));
+ CheckType<absl::Span<int>>(absl::MakeSpan(a));
+ CheckType<absl::Span<int>>(absl::MakeSpan(a, a + 1));
+ CheckType<absl::Span<int>>(absl::MakeSpan(a, 1));
+ CheckType<absl::Span<const int>>(absl::MakeSpan(ca));
+ CheckType<absl::Span<const int>>(absl::MakeSpan(ca, ca + 1));
+ CheckType<absl::Span<const int>>(absl::MakeSpan(ca, 1));
+ CheckType<absl::Span<char>>(absl::MakeSpan(s));
+ CheckType<absl::Span<const char>>(absl::MakeSpan(cs));
+}
+
+TEST(ConstIntSpan, MakeConstSpanTypes) {
+ std::vector<int> vec;
+ const std::vector<int> cvec;
+ int array[1];
+ const int carray[] = {0};
+ int* ptr = array;
+ const int* cptr = carray;
+ std::string s = "";
+ std::string cs = "";
+ CheckType<absl::Span<const int>>(absl::MakeConstSpan(vec));
+ CheckType<absl::Span<const int>>(absl::MakeConstSpan(cvec));
+ CheckType<absl::Span<const int>>(absl::MakeConstSpan(ptr, ptr + 1));
+ CheckType<absl::Span<const int>>(absl::MakeConstSpan(ptr, 1));
+ CheckType<absl::Span<const int>>(absl::MakeConstSpan(cptr, cptr + 1));
+ CheckType<absl::Span<const int>>(absl::MakeConstSpan(cptr, 1));
+ CheckType<absl::Span<const int>>(absl::MakeConstSpan(array));
+ CheckType<absl::Span<const int>>(absl::MakeConstSpan(carray));
+ CheckType<absl::Span<const char>>(absl::MakeConstSpan(s));
+ CheckType<absl::Span<const char>>(absl::MakeConstSpan(cs));
+}
+
+TEST(IntSpan, Equality) {
+ const int arr1[] = {1, 2, 3, 4, 5};
+ int arr2[] = {1, 2, 3, 4, 5};
+ std::vector<int> vec1(std::begin(arr1), std::end(arr1));
+ std::vector<int> vec2 = vec1;
+ std::vector<int> other_vec = {2, 4, 6, 8, 10};
+ // These two slices are from different vectors, but have the same size and
+ // have the same elements (right now). They should compare equal. Test both
+ // == and !=.
+ const absl::Span<const int> from1 = vec1;
+ const absl::Span<const int> from2 = vec2;
+ EXPECT_EQ(from1, from1);
+ EXPECT_FALSE(from1 != from1);
+ EXPECT_EQ(from1, from2);
+ EXPECT_FALSE(from1 != from2);
+
+ // These two slices have different underlying vector values. They should be
+ // considered not equal. Test both == and !=.
+ const absl::Span<const int> from_other = other_vec;
+ EXPECT_NE(from1, from_other);
+ EXPECT_FALSE(from1 == from_other);
+
+ // Comparison between a vector and its slice should be equal. And vice-versa.
+ // This ensures implicit conversion to Span works on both sides of ==.
+ EXPECT_EQ(vec1, from1);
+ EXPECT_FALSE(vec1 != from1);
+ EXPECT_EQ(from1, vec1);
+ EXPECT_FALSE(from1 != vec1);
+
+ // This verifies that absl::Span<T> can be compared freely with
+ // absl::Span<const T>.
+ const absl::Span<int> mutable_from1(vec1);
+ const absl::Span<int> mutable_from2(vec2);
+ EXPECT_EQ(from1, mutable_from1);
+ EXPECT_EQ(mutable_from1, from1);
+ EXPECT_EQ(mutable_from1, mutable_from2);
+ EXPECT_EQ(mutable_from2, mutable_from1);
+
+ // Comparison between a vector and its slice should be equal for mutable
+ // Spans as well.
+ EXPECT_EQ(vec1, mutable_from1);
+ EXPECT_FALSE(vec1 != mutable_from1);
+ EXPECT_EQ(mutable_from1, vec1);
+ EXPECT_FALSE(mutable_from1 != vec1);
+
+ // Comparison between convertible-to-Span-of-const and Span-of-mutable. Arrays
+ // are used because they're the only value type which converts to a
+ // Span-of-mutable. EXPECT_TRUE is used instead of EXPECT_EQ to avoid
+ // array-to-pointer decay.
+ EXPECT_TRUE(arr1 == mutable_from1);
+ EXPECT_FALSE(arr1 != mutable_from1);
+ EXPECT_TRUE(mutable_from1 == arr1);
+ EXPECT_FALSE(mutable_from1 != arr1);
+
+ // Comparison between convertible-to-Span-of-mutable and Span-of-const
+ EXPECT_TRUE(arr2 == from1);
+ EXPECT_FALSE(arr2 != from1);
+ EXPECT_TRUE(from1 == arr2);
+ EXPECT_FALSE(from1 != arr2);
+
+ // With a different size, the array slices should not be equal.
+ EXPECT_NE(from1, absl::Span<const int>(from1).subspan(0, from1.size() - 1));
+
+ // With different contents, the array slices should not be equal.
+ ++vec2.back();
+ EXPECT_NE(from1, from2);
+}
+
+class IntSpanOrderComparisonTest : public testing::Test {
+ public:
+ IntSpanOrderComparisonTest()
+ : arr_before_{1, 2, 3},
+ arr_after_{1, 2, 4},
+ carr_after_{1, 2, 4},
+ vec_before_(std::begin(arr_before_), std::end(arr_before_)),
+ vec_after_(std::begin(arr_after_), std::end(arr_after_)),
+ before_(vec_before_),
+ after_(vec_after_),
+ cbefore_(vec_before_),
+ cafter_(vec_after_) {}
+
+ protected:
+ int arr_before_[3], arr_after_[3];
+ const int carr_after_[3];
+ std::vector<int> vec_before_, vec_after_;
+ absl::Span<int> before_, after_;
+ absl::Span<const int> cbefore_, cafter_;
+};
+
+TEST_F(IntSpanOrderComparisonTest, CompareSpans) {
+ EXPECT_TRUE(cbefore_ < cafter_);
+ EXPECT_TRUE(cbefore_ <= cafter_);
+ EXPECT_TRUE(cafter_ > cbefore_);
+ EXPECT_TRUE(cafter_ >= cbefore_);
+
+ EXPECT_FALSE(cbefore_ > cafter_);
+ EXPECT_FALSE(cafter_ < cbefore_);
+
+ EXPECT_TRUE(before_ < after_);
+ EXPECT_TRUE(before_ <= after_);
+ EXPECT_TRUE(after_ > before_);
+ EXPECT_TRUE(after_ >= before_);
+
+ EXPECT_FALSE(before_ > after_);
+ EXPECT_FALSE(after_ < before_);
+
+ EXPECT_TRUE(cbefore_ < after_);
+ EXPECT_TRUE(cbefore_ <= after_);
+ EXPECT_TRUE(after_ > cbefore_);
+ EXPECT_TRUE(after_ >= cbefore_);
+
+ EXPECT_FALSE(cbefore_ > after_);
+ EXPECT_FALSE(after_ < cbefore_);
+}
+
+TEST_F(IntSpanOrderComparisonTest, SpanOfConstAndContainer) {
+ EXPECT_TRUE(cbefore_ < vec_after_);
+ EXPECT_TRUE(cbefore_ <= vec_after_);
+ EXPECT_TRUE(vec_after_ > cbefore_);
+ EXPECT_TRUE(vec_after_ >= cbefore_);
+
+ EXPECT_FALSE(cbefore_ > vec_after_);
+ EXPECT_FALSE(vec_after_ < cbefore_);
+
+ EXPECT_TRUE(arr_before_ < cafter_);
+ EXPECT_TRUE(arr_before_ <= cafter_);
+ EXPECT_TRUE(cafter_ > arr_before_);
+ EXPECT_TRUE(cafter_ >= arr_before_);
+
+ EXPECT_FALSE(arr_before_ > cafter_);
+ EXPECT_FALSE(cafter_ < arr_before_);
+}
+
+TEST_F(IntSpanOrderComparisonTest, SpanOfMutableAndContainer) {
+ EXPECT_TRUE(vec_before_ < after_);
+ EXPECT_TRUE(vec_before_ <= after_);
+ EXPECT_TRUE(after_ > vec_before_);
+ EXPECT_TRUE(after_ >= vec_before_);
+
+ EXPECT_FALSE(vec_before_ > after_);
+ EXPECT_FALSE(after_ < vec_before_);
+
+ EXPECT_TRUE(before_ < carr_after_);
+ EXPECT_TRUE(before_ <= carr_after_);
+ EXPECT_TRUE(carr_after_ > before_);
+ EXPECT_TRUE(carr_after_ >= before_);
+
+ EXPECT_FALSE(before_ > carr_after_);
+ EXPECT_FALSE(carr_after_ < before_);
+}
+
+TEST_F(IntSpanOrderComparisonTest, EqualSpans) {
+ EXPECT_FALSE(before_ < before_);
+ EXPECT_TRUE(before_ <= before_);
+ EXPECT_FALSE(before_ > before_);
+ EXPECT_TRUE(before_ >= before_);
+}
+
+TEST_F(IntSpanOrderComparisonTest, Subspans) {
+ auto subspan = before_.subspan(0, 1);
+ EXPECT_TRUE(subspan < before_);
+ EXPECT_TRUE(subspan <= before_);
+ EXPECT_TRUE(before_ > subspan);
+ EXPECT_TRUE(before_ >= subspan);
+
+ EXPECT_FALSE(subspan > before_);
+ EXPECT_FALSE(before_ < subspan);
+}
+
+TEST_F(IntSpanOrderComparisonTest, EmptySpans) {
+ absl::Span<int> empty;
+ EXPECT_FALSE(empty < empty);
+ EXPECT_TRUE(empty <= empty);
+ EXPECT_FALSE(empty > empty);
+ EXPECT_TRUE(empty >= empty);
+
+ EXPECT_TRUE(empty < before_);
+ EXPECT_TRUE(empty <= before_);
+ EXPECT_TRUE(before_ > empty);
+ EXPECT_TRUE(before_ >= empty);
+
+ EXPECT_FALSE(empty > before_);
+ EXPECT_FALSE(before_ < empty);
+}
+
+TEST(IntSpan, ExposesContainerTypesAndConsts) {
+ absl::Span<int> slice;
+ CheckType<absl::Span<int>::iterator>(slice.begin());
+ EXPECT_TRUE((std::is_convertible<decltype(slice.begin()),
+ absl::Span<int>::const_iterator>::value));
+ CheckType<absl::Span<int>::const_iterator>(slice.cbegin());
+ EXPECT_TRUE((std::is_convertible<decltype(slice.end()),
+ absl::Span<int>::const_iterator>::value));
+ CheckType<absl::Span<int>::const_iterator>(slice.cend());
+ CheckType<absl::Span<int>::reverse_iterator>(slice.rend());
+ EXPECT_TRUE(
+ (std::is_convertible<decltype(slice.rend()),
+ absl::Span<int>::const_reverse_iterator>::value));
+ CheckType<absl::Span<int>::const_reverse_iterator>(slice.crend());
+ testing::StaticAssertTypeEq<int, absl::Span<int>::value_type>();
+ testing::StaticAssertTypeEq<int, absl::Span<const int>::value_type>();
+ testing::StaticAssertTypeEq<int*, absl::Span<int>::pointer>();
+ testing::StaticAssertTypeEq<const int*, absl::Span<const int>::pointer>();
+ testing::StaticAssertTypeEq<int&, absl::Span<int>::reference>();
+ testing::StaticAssertTypeEq<const int&, absl::Span<const int>::reference>();
+ testing::StaticAssertTypeEq<const int&, absl::Span<int>::const_reference>();
+ testing::StaticAssertTypeEq<const int&,
+ absl::Span<const int>::const_reference>();
+ EXPECT_EQ(static_cast<absl::Span<int>::size_type>(-1), absl::Span<int>::npos);
+}
+
+TEST(IntSpan, IteratorsAndReferences) {
+ auto accept_pointer = [](int*) {};
+ auto accept_reference = [](int&) {};
+ auto accept_iterator = [](absl::Span<int>::iterator) {};
+ auto accept_const_iterator = [](absl::Span<int>::const_iterator) {};
+ auto accept_reverse_iterator = [](absl::Span<int>::reverse_iterator) {};
+ auto accept_const_reverse_iterator =
+ [](absl::Span<int>::const_reverse_iterator) {};
+
+ int a[1];
+ absl::Span<int> s = a;
+
+ accept_pointer(s.data());
+ accept_iterator(s.begin());
+ accept_const_iterator(s.begin());
+ accept_const_iterator(s.cbegin());
+ accept_iterator(s.end());
+ accept_const_iterator(s.end());
+ accept_const_iterator(s.cend());
+ accept_reverse_iterator(s.rbegin());
+ accept_const_reverse_iterator(s.rbegin());
+ accept_const_reverse_iterator(s.crbegin());
+ accept_reverse_iterator(s.rend());
+ accept_const_reverse_iterator(s.rend());
+ accept_const_reverse_iterator(s.crend());
+
+ accept_reference(s[0]);
+ accept_reference(s.at(0));
+ accept_reference(s.front());
+ accept_reference(s.back());
+}
+
+TEST(IntSpan, IteratorsAndReferences_Const) {
+ auto accept_pointer = [](int*) {};
+ auto accept_reference = [](int&) {};
+ auto accept_iterator = [](absl::Span<int>::iterator) {};
+ auto accept_const_iterator = [](absl::Span<int>::const_iterator) {};
+ auto accept_reverse_iterator = [](absl::Span<int>::reverse_iterator) {};
+ auto accept_const_reverse_iterator =
+ [](absl::Span<int>::const_reverse_iterator) {};
+
+ int a[1];
+ const absl::Span<int> s = a;
+
+ accept_pointer(s.data());
+ accept_iterator(s.begin());
+ accept_const_iterator(s.begin());
+ accept_const_iterator(s.cbegin());
+ accept_iterator(s.end());
+ accept_const_iterator(s.end());
+ accept_const_iterator(s.cend());
+ accept_reverse_iterator(s.rbegin());
+ accept_const_reverse_iterator(s.rbegin());
+ accept_const_reverse_iterator(s.crbegin());
+ accept_reverse_iterator(s.rend());
+ accept_const_reverse_iterator(s.rend());
+ accept_const_reverse_iterator(s.crend());
+
+ accept_reference(s[0]);
+ accept_reference(s.at(0));
+ accept_reference(s.front());
+ accept_reference(s.back());
+}
+
+TEST(IntSpan, NoexceptTest) {
+ int a[] = {1, 2, 3};
+ std::vector<int> v;
+ EXPECT_TRUE(noexcept(absl::Span<const int>()));
+ EXPECT_TRUE(noexcept(absl::Span<const int>(a, 2)));
+ EXPECT_TRUE(noexcept(absl::Span<const int>(a)));
+ EXPECT_TRUE(noexcept(absl::Span<const int>(v)));
+ EXPECT_TRUE(noexcept(absl::Span<int>(v)));
+ EXPECT_TRUE(noexcept(absl::Span<const int>({1, 2, 3})));
+ EXPECT_TRUE(noexcept(absl::MakeSpan(v)));
+ EXPECT_TRUE(noexcept(absl::MakeSpan(a)));
+ EXPECT_TRUE(noexcept(absl::MakeSpan(a, 2)));
+ EXPECT_TRUE(noexcept(absl::MakeSpan(a, a + 1)));
+ EXPECT_TRUE(noexcept(absl::MakeConstSpan(v)));
+ EXPECT_TRUE(noexcept(absl::MakeConstSpan(a)));
+ EXPECT_TRUE(noexcept(absl::MakeConstSpan(a, 2)));
+ EXPECT_TRUE(noexcept(absl::MakeConstSpan(a, a + 1)));
+
+ absl::Span<int> s(v);
+ EXPECT_TRUE(noexcept(s.data()));
+ EXPECT_TRUE(noexcept(s.size()));
+ EXPECT_TRUE(noexcept(s.length()));
+ EXPECT_TRUE(noexcept(s.empty()));
+ EXPECT_TRUE(noexcept(s[0]));
+ EXPECT_TRUE(noexcept(s.front()));
+ EXPECT_TRUE(noexcept(s.back()));
+ EXPECT_TRUE(noexcept(s.begin()));
+ EXPECT_TRUE(noexcept(s.cbegin()));
+ EXPECT_TRUE(noexcept(s.end()));
+ EXPECT_TRUE(noexcept(s.cend()));
+ EXPECT_TRUE(noexcept(s.rbegin()));
+ EXPECT_TRUE(noexcept(s.crbegin()));
+ EXPECT_TRUE(noexcept(s.rend()));
+ EXPECT_TRUE(noexcept(s.crend()));
+ EXPECT_TRUE(noexcept(s.remove_prefix(0)));
+ EXPECT_TRUE(noexcept(s.remove_suffix(0)));
+}
+
+// ConstexprTester exercises expressions in a constexpr context. Simply placing
+// the expression in a constexpr function is not enough, as some compilers will
+// simply compile the constexpr function as runtime code. Using template
+// parameters forces compile-time execution.
+template <int i>
+struct ConstexprTester {};
+
+#define ABSL_TEST_CONSTEXPR(expr) \
+ do { \
+ ABSL_ATTRIBUTE_UNUSED ConstexprTester<(expr, 1)> t; \
+ } while (0)
+
+struct ContainerWithConstexprMethods {
+ constexpr int size() const { return 1; }
+ constexpr const int* data() const { return &i; }
+ const int i;
+};
+
+TEST(ConstIntSpan, ConstexprTest) {
+ static constexpr int a[] = {1, 2, 3};
+ static constexpr int sized_arr[2] = {1, 2};
+ static constexpr ContainerWithConstexprMethods c{1};
+ ABSL_TEST_CONSTEXPR(absl::Span<const int>());
+ ABSL_TEST_CONSTEXPR(absl::Span<const int>(a, 2));
+ ABSL_TEST_CONSTEXPR(absl::Span<const int>(sized_arr));
+ ABSL_TEST_CONSTEXPR(absl::Span<const int>(c));
+ ABSL_TEST_CONSTEXPR(absl::MakeSpan(&a[0], 1));
+ ABSL_TEST_CONSTEXPR(absl::MakeSpan(c));
+ ABSL_TEST_CONSTEXPR(absl::MakeSpan(a));
+ ABSL_TEST_CONSTEXPR(absl::MakeConstSpan(&a[0], 1));
+ ABSL_TEST_CONSTEXPR(absl::MakeConstSpan(c));
+ ABSL_TEST_CONSTEXPR(absl::MakeConstSpan(a));
+
+ constexpr absl::Span<const int> span = c;
+ ABSL_TEST_CONSTEXPR(span.data());
+ ABSL_TEST_CONSTEXPR(span.size());
+ ABSL_TEST_CONSTEXPR(span.length());
+ ABSL_TEST_CONSTEXPR(span.empty());
+ ABSL_TEST_CONSTEXPR(span.begin());
+ ABSL_TEST_CONSTEXPR(span.cbegin());
+ ABSL_TEST_CONSTEXPR(span.subspan(0, 0));
+ ABSL_TEST_CONSTEXPR(span.first(1));
+ ABSL_TEST_CONSTEXPR(span.last(1));
+ ABSL_TEST_CONSTEXPR(span[0]);
+}
+
+struct BigStruct {
+ char bytes[10000];
+};
+
+TEST(Span, SpanSize) {
+ EXPECT_LE(sizeof(absl::Span<int>), 2 * sizeof(void*));
+ EXPECT_LE(sizeof(absl::Span<BigStruct>), 2 * sizeof(void*));
+}
+
+TEST(Span, Hash) {
+ int array[] = {1, 2, 3, 4};
+ int array2[] = {1, 2, 3};
+ using T = absl::Span<const int>;
+ EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(
+ {// Empties
+ T(), T(nullptr, 0), T(array, 0), T(array2, 0),
+ // Different array with same value
+ T(array, 3), T(array2), T({1, 2, 3}),
+ // Same array, but different length
+ T(array, 1), T(array, 2),
+ // Same length, but different array
+ T(array + 1, 2), T(array + 2, 2)}));
+}
+
+} // namespace
diff --git a/third_party/abseil/src/absl/types/variant.h b/third_party/abseil/src/absl/types/variant.h
new file mode 100644
index 0000000..ac93464
--- /dev/null
+++ b/third_party/abseil/src/absl/types/variant.h
@@ -0,0 +1,866 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// variant.h
+// -----------------------------------------------------------------------------
+//
+// This header file defines an `absl::variant` type for holding a type-safe
+// value of some prescribed set of types (noted as alternative types), and
+// associated functions for managing variants.
+//
+// The `absl::variant` type is a form of type-safe union. An `absl::variant`
+// should always hold a value of one of its alternative types (except in the
+// "valueless by exception state" -- see below). A default-constructed
+// `absl::variant` will hold the value of its first alternative type, provided
+// it is default-constructible.
+//
+// In exceptional cases due to error, an `absl::variant` can hold no
+// value (known as a "valueless by exception" state), though this is not the
+// norm.
+//
+// As with `absl::optional`, an `absl::variant` -- when it holds a value --
+// allocates a value of that type directly within the `variant` itself; it
+// cannot hold a reference, array, or the type `void`; it can, however, hold a
+// pointer to externally managed memory.
+//
+// `absl::variant` is a C++11 compatible version of the C++17 `std::variant`
+// abstraction and is designed to be a drop-in replacement for code compliant
+// with C++17.
+
+#ifndef ABSL_TYPES_VARIANT_H_
+#define ABSL_TYPES_VARIANT_H_
+
+#include "absl/base/config.h"
+#include "absl/utility/utility.h"
+
+#ifdef ABSL_USES_STD_VARIANT
+
+#include <variant> // IWYU pragma: export
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+using std::bad_variant_access;
+using std::get;
+using std::get_if;
+using std::holds_alternative;
+using std::monostate;
+using std::variant;
+using std::variant_alternative;
+using std::variant_alternative_t;
+using std::variant_npos;
+using std::variant_size;
+using std::variant_size_v;
+using std::visit;
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#else // ABSL_USES_STD_VARIANT
+
+#include <functional>
+#include <new>
+#include <type_traits>
+#include <utility>
+
+#include "absl/base/macros.h"
+#include "absl/base/port.h"
+#include "absl/meta/type_traits.h"
+#include "absl/types/internal/variant.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+// -----------------------------------------------------------------------------
+// absl::variant
+// -----------------------------------------------------------------------------
+//
+// An `absl::variant` type is a form of type-safe union. An `absl::variant` --
+// except in exceptional cases -- always holds a value of one of its alternative
+// types.
+//
+// Example:
+//
+// // Construct a variant that holds either an integer or a std::string and
+// // assign it to a std::string.
+// absl::variant<int, std::string> v = std::string("abc");
+//
+// // A default-constructed variant will hold a value-initialized value of
+// // the first alternative type.
+// auto a = absl::variant<int, std::string>(); // Holds an int of value '0'.
+//
+// // variants are assignable.
+//
+// // copy assignment
+// auto v1 = absl::variant<int, std::string>("abc");
+// auto v2 = absl::variant<int, std::string>(10);
+// v2 = v1; // copy assign
+//
+// // move assignment
+// auto v1 = absl::variant<int, std::string>("abc");
+// v1 = absl::variant<int, std::string>(10);
+//
+// // assignment through type conversion
+// a = 128; // variant contains int
+// a = "128"; // variant contains std::string
+//
+// An `absl::variant` holding a value of one of its alternative types `T` holds
+// an allocation of `T` directly within the variant itself. An `absl::variant`
+// is not allowed to allocate additional storage, such as dynamic memory, to
+// allocate the contained value. The contained value shall be allocated in a
+// region of the variant storage suitably aligned for all alternative types.
+template <typename... Ts>
+class variant;
+
+// swap()
+//
+// Swaps two `absl::variant` values. This function is equivalent to `v.swap(w)`
+// where `v` and `w` are `absl::variant` types.
+//
+// Note that this function requires all alternative types to be both swappable
+// and move-constructible, because any two variants may refer to either the same
+// type (in which case, they will be swapped) or to two different types (in
+// which case the values will need to be moved).
+//
+template <
+ typename... Ts,
+ absl::enable_if_t<
+ absl::conjunction<std::is_move_constructible<Ts>...,
+ type_traits_internal::IsSwappable<Ts>...>::value,
+ int> = 0>
+void swap(variant<Ts...>& v, variant<Ts...>& w) noexcept(noexcept(v.swap(w))) {
+ v.swap(w);
+}
+
+// variant_size
+//
+// Returns the number of alternative types available for a given `absl::variant`
+// type as a compile-time constant expression. As this is a class template, it
+// is not generally useful for accessing the number of alternative types of
+// any given `absl::variant` instance.
+//
+// Example:
+//
+// auto a = absl::variant<int, std::string>;
+// constexpr int num_types =
+// absl::variant_size<absl::variant<int, std::string>>();
+//
+// // You can also use the member constant `value`.
+// constexpr int num_types =
+// absl::variant_size<absl::variant<int, std::string>>::value;
+//
+// // `absl::variant_size` is more valuable for use in generic code:
+// template <typename Variant>
+// constexpr bool IsVariantMultivalue() {
+// return absl::variant_size<Variant>() > 1;
+// }
+//
+// Note that the set of cv-qualified specializations of `variant_size` are
+// provided to ensure that those specializations compile (especially when passed
+// within template logic).
+template <class T>
+struct variant_size;
+
+template <class... Ts>
+struct variant_size<variant<Ts...>>
+ : std::integral_constant<std::size_t, sizeof...(Ts)> {};
+
+// Specialization of `variant_size` for const qualified variants.
+template <class T>
+struct variant_size<const T> : variant_size<T>::type {};
+
+// Specialization of `variant_size` for volatile qualified variants.
+template <class T>
+struct variant_size<volatile T> : variant_size<T>::type {};
+
+// Specialization of `variant_size` for const volatile qualified variants.
+template <class T>
+struct variant_size<const volatile T> : variant_size<T>::type {};
+
+// variant_alternative
+//
+// Returns the alternative type for a given `absl::variant` at the passed
+// index value as a compile-time constant expression. As this is a class
+// template resulting in a type, it is not useful for access of the run-time
+// value of any given `absl::variant` variable.
+//
+// Example:
+//
+// // The type of the 0th alternative is "int".
+// using alternative_type_0
+// = absl::variant_alternative<0, absl::variant<int, std::string>>::type;
+//
+// static_assert(std::is_same<alternative_type_0, int>::value, "");
+//
+// // `absl::variant_alternative` is more valuable for use in generic code:
+// template <typename Variant>
+// constexpr bool IsFirstElementTrivial() {
+// return std::is_trivial_v<variant_alternative<0, Variant>::type>;
+// }
+//
+// Note that the set of cv-qualified specializations of `variant_alternative`
+// are provided to ensure that those specializations compile (especially when
+// passed within template logic).
+template <std::size_t I, class T>
+struct variant_alternative;
+
+template <std::size_t I, class... Types>
+struct variant_alternative<I, variant<Types...>> {
+ using type =
+ variant_internal::VariantAlternativeSfinaeT<I, variant<Types...>>;
+};
+
+// Specialization of `variant_alternative` for const qualified variants.
+template <std::size_t I, class T>
+struct variant_alternative<I, const T> {
+ using type = const typename variant_alternative<I, T>::type;
+};
+
+// Specialization of `variant_alternative` for volatile qualified variants.
+template <std::size_t I, class T>
+struct variant_alternative<I, volatile T> {
+ using type = volatile typename variant_alternative<I, T>::type;
+};
+
+// Specialization of `variant_alternative` for const volatile qualified
+// variants.
+template <std::size_t I, class T>
+struct variant_alternative<I, const volatile T> {
+ using type = const volatile typename variant_alternative<I, T>::type;
+};
+
+// Template type alias for variant_alternative<I, T>::type.
+//
+// Example:
+//
+// using alternative_type_0
+// = absl::variant_alternative_t<0, absl::variant<int, std::string>>;
+// static_assert(std::is_same<alternative_type_0, int>::value, "");
+template <std::size_t I, class T>
+using variant_alternative_t = typename variant_alternative<I, T>::type;
+
+// holds_alternative()
+//
+// Checks whether the given variant currently holds a given alternative type,
+// returning `true` if so.
+//
+// Example:
+//
+// absl::variant<int, std::string> foo = 42;
+// if (absl::holds_alternative<int>(foo)) {
+// std::cout << "The variant holds an integer";
+// }
+template <class T, class... Types>
+constexpr bool holds_alternative(const variant<Types...>& v) noexcept {
+ static_assert(
+ variant_internal::UnambiguousIndexOfImpl<variant<Types...>, T,
+ 0>::value != sizeof...(Types),
+ "The type T must occur exactly once in Types...");
+ return v.index() ==
+ variant_internal::UnambiguousIndexOf<variant<Types...>, T>::value;
+}
+
+// get()
+//
+// Returns a reference to the value currently within a given variant, using
+// either a unique alternative type amongst the variant's set of alternative
+// types, or the variant's index value. Attempting to get a variant's value
+// using a type that is not unique within the variant's set of alternative types
+// is a compile-time error. If the index of the alternative being specified is
+// different from the index of the alternative that is currently stored, throws
+// `absl::bad_variant_access`.
+//
+// Example:
+//
+// auto a = absl::variant<int, std::string>;
+//
+// // Get the value by type (if unique).
+// int i = absl::get<int>(a);
+//
+// auto b = absl::variant<int, int>;
+//
+// // Getting the value by a type that is not unique is ill-formed.
+// int j = absl::get<int>(b); // Compile Error!
+//
+// // Getting value by index not ambiguous and allowed.
+// int k = absl::get<1>(b);
+
+// Overload for getting a variant's lvalue by type.
+template <class T, class... Types>
+constexpr T& get(variant<Types...>& v) { // NOLINT
+ return variant_internal::VariantCoreAccess::CheckedAccess<
+ variant_internal::IndexOf<T, Types...>::value>(v);
+}
+
+// Overload for getting a variant's rvalue by type.
+// Note: `absl::move()` is required to allow use of constexpr in C++11.
+template <class T, class... Types>
+constexpr T&& get(variant<Types...>&& v) {
+ return variant_internal::VariantCoreAccess::CheckedAccess<
+ variant_internal::IndexOf<T, Types...>::value>(absl::move(v));
+}
+
+// Overload for getting a variant's const lvalue by type.
+template <class T, class... Types>
+constexpr const T& get(const variant<Types...>& v) {
+ return variant_internal::VariantCoreAccess::CheckedAccess<
+ variant_internal::IndexOf<T, Types...>::value>(v);
+}
+
+// Overload for getting a variant's const rvalue by type.
+// Note: `absl::move()` is required to allow use of constexpr in C++11.
+template <class T, class... Types>
+constexpr const T&& get(const variant<Types...>&& v) {
+ return variant_internal::VariantCoreAccess::CheckedAccess<
+ variant_internal::IndexOf<T, Types...>::value>(absl::move(v));
+}
+
+// Overload for getting a variant's lvalue by index.
+template <std::size_t I, class... Types>
+constexpr variant_alternative_t<I, variant<Types...>>& get(
+ variant<Types...>& v) { // NOLINT
+ return variant_internal::VariantCoreAccess::CheckedAccess<I>(v);
+}
+
+// Overload for getting a variant's rvalue by index.
+// Note: `absl::move()` is required to allow use of constexpr in C++11.
+template <std::size_t I, class... Types>
+constexpr variant_alternative_t<I, variant<Types...>>&& get(
+ variant<Types...>&& v) {
+ return variant_internal::VariantCoreAccess::CheckedAccess<I>(absl::move(v));
+}
+
+// Overload for getting a variant's const lvalue by index.
+template <std::size_t I, class... Types>
+constexpr const variant_alternative_t<I, variant<Types...>>& get(
+ const variant<Types...>& v) {
+ return variant_internal::VariantCoreAccess::CheckedAccess<I>(v);
+}
+
+// Overload for getting a variant's const rvalue by index.
+// Note: `absl::move()` is required to allow use of constexpr in C++11.
+template <std::size_t I, class... Types>
+constexpr const variant_alternative_t<I, variant<Types...>>&& get(
+ const variant<Types...>&& v) {
+ return variant_internal::VariantCoreAccess::CheckedAccess<I>(absl::move(v));
+}
+
+// get_if()
+//
+// Returns a pointer to the value currently stored within a given variant, if
+// present, using either a unique alternative type amongst the variant's set of
+// alternative types, or the variant's index value. If such a value does not
+// exist, returns `nullptr`.
+//
+// As with `get`, attempting to get a variant's value using a type that is not
+// unique within the variant's set of alternative types is a compile-time error.
+
+// Overload for getting a pointer to the value stored in the given variant by
+// index.
+template <std::size_t I, class... Types>
+constexpr absl::add_pointer_t<variant_alternative_t<I, variant<Types...>>>
+get_if(variant<Types...>* v) noexcept {
+ return (v != nullptr && v->index() == I)
+ ? std::addressof(
+ variant_internal::VariantCoreAccess::Access<I>(*v))
+ : nullptr;
+}
+
+// Overload for getting a pointer to the const value stored in the given
+// variant by index.
+template <std::size_t I, class... Types>
+constexpr absl::add_pointer_t<const variant_alternative_t<I, variant<Types...>>>
+get_if(const variant<Types...>* v) noexcept {
+ return (v != nullptr && v->index() == I)
+ ? std::addressof(
+ variant_internal::VariantCoreAccess::Access<I>(*v))
+ : nullptr;
+}
+
+// Overload for getting a pointer to the value stored in the given variant by
+// type.
+template <class T, class... Types>
+constexpr absl::add_pointer_t<T> get_if(variant<Types...>* v) noexcept {
+ return absl::get_if<variant_internal::IndexOf<T, Types...>::value>(v);
+}
+
+// Overload for getting a pointer to the const value stored in the given variant
+// by type.
+template <class T, class... Types>
+constexpr absl::add_pointer_t<const T> get_if(
+ const variant<Types...>* v) noexcept {
+ return absl::get_if<variant_internal::IndexOf<T, Types...>::value>(v);
+}
+
+// visit()
+//
+// Calls a provided functor on a given set of variants. `absl::visit()` is
+// commonly used to conditionally inspect the state of a given variant (or set
+// of variants).
+//
+// The functor must return the same type when called with any of the variants'
+// alternatives.
+//
+// Example:
+//
+// // Define a visitor functor
+// struct GetVariant {
+// template<typename T>
+// void operator()(const T& i) const {
+// std::cout << "The variant's value is: " << i;
+// }
+// };
+//
+// // Declare our variant, and call `absl::visit()` on it.
+// // Note that `GetVariant()` returns void in either case.
+// absl::variant<int, std::string> foo = std::string("foo");
+// GetVariant visitor;
+// absl::visit(visitor, foo); // Prints `The variant's value is: foo'
+template <typename Visitor, typename... Variants>
+variant_internal::VisitResult<Visitor, Variants...> visit(Visitor&& vis,
+ Variants&&... vars) {
+ return variant_internal::
+ VisitIndices<variant_size<absl::decay_t<Variants> >::value...>::Run(
+ variant_internal::PerformVisitation<Visitor, Variants...>{
+ std::forward_as_tuple(absl::forward<Variants>(vars)...),
+ absl::forward<Visitor>(vis)},
+ vars.index()...);
+}
+
+// monostate
+//
+// The monostate class serves as a first alternative type for a variant for
+// which the first variant type is otherwise not default-constructible.
+struct monostate {};
+
+// `absl::monostate` Relational Operators
+
+constexpr bool operator<(monostate, monostate) noexcept { return false; }
+constexpr bool operator>(monostate, monostate) noexcept { return false; }
+constexpr bool operator<=(monostate, monostate) noexcept { return true; }
+constexpr bool operator>=(monostate, monostate) noexcept { return true; }
+constexpr bool operator==(monostate, monostate) noexcept { return true; }
+constexpr bool operator!=(monostate, monostate) noexcept { return false; }
+
+
+//------------------------------------------------------------------------------
+// `absl::variant` Template Definition
+//------------------------------------------------------------------------------
+template <typename T0, typename... Tn>
+class variant<T0, Tn...> : private variant_internal::VariantBase<T0, Tn...> {
+ static_assert(absl::conjunction<std::is_object<T0>,
+ std::is_object<Tn>...>::value,
+ "Attempted to instantiate a variant containing a non-object "
+ "type.");
+ // Intentionally not qualifying `negation` with `absl::` to work around a bug
+ // in MSVC 2015 with inline namespace and variadic template.
+ static_assert(absl::conjunction<negation<std::is_array<T0> >,
+ negation<std::is_array<Tn> >...>::value,
+ "Attempted to instantiate a variant containing an array type.");
+ static_assert(absl::conjunction<std::is_nothrow_destructible<T0>,
+ std::is_nothrow_destructible<Tn>...>::value,
+ "Attempted to instantiate a variant containing a non-nothrow "
+ "destructible type.");
+
+ friend struct variant_internal::VariantCoreAccess;
+
+ private:
+ using Base = variant_internal::VariantBase<T0, Tn...>;
+
+ public:
+ // Constructors
+
+ // Constructs a variant holding a default-initialized value of the first
+ // alternative type.
+ constexpr variant() /*noexcept(see 111above)*/ = default;
+
+ // Copy constructor, standard semantics
+ variant(const variant& other) = default;
+
+ // Move constructor, standard semantics
+ variant(variant&& other) /*noexcept(see above)*/ = default;
+
+ // Constructs a variant of an alternative type specified by overload
+ // resolution of the provided forwarding arguments through
+ // direct-initialization.
+ //
+ // Note: If the selected constructor is a constexpr constructor, this
+ // constructor shall be a constexpr constructor.
+ //
+ // NOTE: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0608r1.html
+ // has been voted passed the design phase in the C++ standard meeting in Mar
+ // 2018. It will be implemented and integrated into `absl::variant`.
+ template <
+ class T,
+ std::size_t I = std::enable_if<
+ variant_internal::IsNeitherSelfNorInPlace<variant,
+ absl::decay_t<T>>::value,
+ variant_internal::IndexOfConstructedType<variant, T>>::type::value,
+ class Tj = absl::variant_alternative_t<I, variant>,
+ absl::enable_if_t<std::is_constructible<Tj, T>::value>* =
+ nullptr>
+ constexpr variant(T&& t) noexcept(std::is_nothrow_constructible<Tj, T>::value)
+ : Base(variant_internal::EmplaceTag<I>(), absl::forward<T>(t)) {}
+
+ // Constructs a variant of an alternative type from the arguments through
+ // direct-initialization.
+ //
+ // Note: If the selected constructor is a constexpr constructor, this
+ // constructor shall be a constexpr constructor.
+ template <class T, class... Args,
+ typename std::enable_if<std::is_constructible<
+ variant_internal::UnambiguousTypeOfT<variant, T>,
+ Args...>::value>::type* = nullptr>
+ constexpr explicit variant(in_place_type_t<T>, Args&&... args)
+ : Base(variant_internal::EmplaceTag<
+ variant_internal::UnambiguousIndexOf<variant, T>::value>(),
+ absl::forward<Args>(args)...) {}
+
+ // Constructs a variant of an alternative type from an initializer list
+ // and other arguments through direct-initialization.
+ //
+ // Note: If the selected constructor is a constexpr constructor, this
+ // constructor shall be a constexpr constructor.
+ template <class T, class U, class... Args,
+ typename std::enable_if<std::is_constructible<
+ variant_internal::UnambiguousTypeOfT<variant, T>,
+ std::initializer_list<U>&, Args...>::value>::type* = nullptr>
+ constexpr explicit variant(in_place_type_t<T>, std::initializer_list<U> il,
+ Args&&... args)
+ : Base(variant_internal::EmplaceTag<
+ variant_internal::UnambiguousIndexOf<variant, T>::value>(),
+ il, absl::forward<Args>(args)...) {}
+
+ // Constructs a variant of an alternative type from a provided index,
+ // through value-initialization using the provided forwarded arguments.
+ template <std::size_t I, class... Args,
+ typename std::enable_if<std::is_constructible<
+ variant_internal::VariantAlternativeSfinaeT<I, variant>,
+ Args...>::value>::type* = nullptr>
+ constexpr explicit variant(in_place_index_t<I>, Args&&... args)
+ : Base(variant_internal::EmplaceTag<I>(), absl::forward<Args>(args)...) {}
+
+ // Constructs a variant of an alternative type from a provided index,
+ // through value-initialization of an initializer list and the provided
+ // forwarded arguments.
+ template <std::size_t I, class U, class... Args,
+ typename std::enable_if<std::is_constructible<
+ variant_internal::VariantAlternativeSfinaeT<I, variant>,
+ std::initializer_list<U>&, Args...>::value>::type* = nullptr>
+ constexpr explicit variant(in_place_index_t<I>, std::initializer_list<U> il,
+ Args&&... args)
+ : Base(variant_internal::EmplaceTag<I>(), il,
+ absl::forward<Args>(args)...) {}
+
+ // Destructors
+
+ // Destroys the variant's currently contained value, provided that
+ // `absl::valueless_by_exception()` is false.
+ ~variant() = default;
+
+ // Assignment Operators
+
+ // Copy assignment operator
+ variant& operator=(const variant& other) = default;
+
+ // Move assignment operator
+ variant& operator=(variant&& other) /*noexcept(see above)*/ = default;
+
+ // Converting assignment operator
+ //
+ // NOTE: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0608r1.html
+ // has been voted passed the design phase in the C++ standard meeting in Mar
+ // 2018. It will be implemented and integrated into `absl::variant`.
+ template <
+ class T,
+ std::size_t I = std::enable_if<
+ !std::is_same<absl::decay_t<T>, variant>::value,
+ variant_internal::IndexOfConstructedType<variant, T>>::type::value,
+ class Tj = absl::variant_alternative_t<I, variant>,
+ typename std::enable_if<std::is_assignable<Tj&, T>::value &&
+ std::is_constructible<Tj, T>::value>::type* =
+ nullptr>
+ variant& operator=(T&& t) noexcept(
+ std::is_nothrow_assignable<Tj&, T>::value&&
+ std::is_nothrow_constructible<Tj, T>::value) {
+ variant_internal::VisitIndices<sizeof...(Tn) + 1>::Run(
+ variant_internal::VariantCoreAccess::MakeConversionAssignVisitor(
+ this, absl::forward<T>(t)),
+ index());
+
+ return *this;
+ }
+
+
+ // emplace() Functions
+
+ // Constructs a value of the given alternative type T within the variant. The
+ // existing value of the variant is destroyed first (provided that
+ // `absl::valueless_by_exception()` is false). Requires that T is unambiguous
+ // in the variant.
+ //
+ // Example:
+ //
+ // absl::variant<std::vector<int>, int, std::string> v;
+ // v.emplace<int>(99);
+ // v.emplace<std::string>("abc");
+ template <
+ class T, class... Args,
+ typename std::enable_if<std::is_constructible<
+ absl::variant_alternative_t<
+ variant_internal::UnambiguousIndexOf<variant, T>::value, variant>,
+ Args...>::value>::type* = nullptr>
+ T& emplace(Args&&... args) {
+ return variant_internal::VariantCoreAccess::Replace<
+ variant_internal::UnambiguousIndexOf<variant, T>::value>(
+ this, absl::forward<Args>(args)...);
+ }
+
+ // Constructs a value of the given alternative type T within the variant using
+ // an initializer list. The existing value of the variant is destroyed first
+ // (provided that `absl::valueless_by_exception()` is false). Requires that T
+ // is unambiguous in the variant.
+ //
+ // Example:
+ //
+ // absl::variant<std::vector<int>, int, std::string> v;
+ // v.emplace<std::vector<int>>({0, 1, 2});
+ template <
+ class T, class U, class... Args,
+ typename std::enable_if<std::is_constructible<
+ absl::variant_alternative_t<
+ variant_internal::UnambiguousIndexOf<variant, T>::value, variant>,
+ std::initializer_list<U>&, Args...>::value>::type* = nullptr>
+ T& emplace(std::initializer_list<U> il, Args&&... args) {
+ return variant_internal::VariantCoreAccess::Replace<
+ variant_internal::UnambiguousIndexOf<variant, T>::value>(
+ this, il, absl::forward<Args>(args)...);
+ }
+
+ // Destroys the current value of the variant (provided that
+ // `absl::valueless_by_exception()` is false) and constructs a new value at
+ // the given index.
+ //
+ // Example:
+ //
+ // absl::variant<std::vector<int>, int, int> v;
+ // v.emplace<1>(99);
+ // v.emplace<2>(98);
+ // v.emplace<int>(99); // Won't compile. 'int' isn't a unique type.
+ template <std::size_t I, class... Args,
+ typename std::enable_if<
+ std::is_constructible<absl::variant_alternative_t<I, variant>,
+ Args...>::value>::type* = nullptr>
+ absl::variant_alternative_t<I, variant>& emplace(Args&&... args) {
+ return variant_internal::VariantCoreAccess::Replace<I>(
+ this, absl::forward<Args>(args)...);
+ }
+
+ // Destroys the current value of the variant (provided that
+ // `absl::valueless_by_exception()` is false) and constructs a new value at
+ // the given index using an initializer list and the provided arguments.
+ //
+ // Example:
+ //
+ // absl::variant<std::vector<int>, int, int> v;
+ // v.emplace<0>({0, 1, 2});
+ template <std::size_t I, class U, class... Args,
+ typename std::enable_if<std::is_constructible<
+ absl::variant_alternative_t<I, variant>,
+ std::initializer_list<U>&, Args...>::value>::type* = nullptr>
+ absl::variant_alternative_t<I, variant>& emplace(std::initializer_list<U> il,
+ Args&&... args) {
+ return variant_internal::VariantCoreAccess::Replace<I>(
+ this, il, absl::forward<Args>(args)...);
+ }
+
+ // variant::valueless_by_exception()
+ //
+ // Returns false if and only if the variant currently holds a valid value.
+ constexpr bool valueless_by_exception() const noexcept {
+ return this->index_ == absl::variant_npos;
+ }
+
+ // variant::index()
+ //
+ // Returns the index value of the variant's currently selected alternative
+ // type.
+ constexpr std::size_t index() const noexcept { return this->index_; }
+
+ // variant::swap()
+ //
+ // Swaps the values of two variant objects.
+ //
+ void swap(variant& rhs) noexcept(
+ absl::conjunction<
+ std::is_nothrow_move_constructible<T0>,
+ std::is_nothrow_move_constructible<Tn>...,
+ type_traits_internal::IsNothrowSwappable<T0>,
+ type_traits_internal::IsNothrowSwappable<Tn>...>::value) {
+ return variant_internal::VisitIndices<sizeof...(Tn) + 1>::Run(
+ variant_internal::Swap<T0, Tn...>{this, &rhs}, rhs.index());
+ }
+};
+
+// We need a valid declaration of variant<> for SFINAE and overload resolution
+// to work properly above, but we don't need a full declaration since this type
+// will never be constructed. This declaration, though incomplete, suffices.
+template <>
+class variant<>;
+
+//------------------------------------------------------------------------------
+// Relational Operators
+//------------------------------------------------------------------------------
+//
+// If neither operand is in the `variant::valueless_by_exception` state:
+//
+// * If the index of both variants is the same, the relational operator
+// returns the result of the corresponding relational operator for the
+// corresponding alternative type.
+// * If the index of both variants is not the same, the relational operator
+// returns the result of that operation applied to the value of the left
+// operand's index and the value of the right operand's index.
+// * If at least one operand is in the valueless_by_exception state:
+// - A variant in the valueless_by_exception state is only considered equal
+// to another variant in the valueless_by_exception state.
+// - If exactly one operand is in the valueless_by_exception state, the
+// variant in the valueless_by_exception state is less than the variant
+// that is not in the valueless_by_exception state.
+//
+// Note: The value 1 is added to each index in the relational comparisons such
+// that the index corresponding to the valueless_by_exception state wraps around
+// to 0 (the lowest value for the index type), and the remaining indices stay in
+// the same relative order.
+
+// Equal-to operator
+template <typename... Types>
+constexpr variant_internal::RequireAllHaveEqualT<Types...> operator==(
+ const variant<Types...>& a, const variant<Types...>& b) {
+ return (a.index() == b.index()) &&
+ variant_internal::VisitIndices<sizeof...(Types)>::Run(
+ variant_internal::EqualsOp<Types...>{&a, &b}, a.index());
+}
+
+// Not equal operator
+template <typename... Types>
+constexpr variant_internal::RequireAllHaveNotEqualT<Types...> operator!=(
+ const variant<Types...>& a, const variant<Types...>& b) {
+ return (a.index() != b.index()) ||
+ variant_internal::VisitIndices<sizeof...(Types)>::Run(
+ variant_internal::NotEqualsOp<Types...>{&a, &b}, a.index());
+}
+
+// Less-than operator
+template <typename... Types>
+constexpr variant_internal::RequireAllHaveLessThanT<Types...> operator<(
+ const variant<Types...>& a, const variant<Types...>& b) {
+ return (a.index() != b.index())
+ ? (a.index() + 1) < (b.index() + 1)
+ : variant_internal::VisitIndices<sizeof...(Types)>::Run(
+ variant_internal::LessThanOp<Types...>{&a, &b}, a.index());
+}
+
+// Greater-than operator
+template <typename... Types>
+constexpr variant_internal::RequireAllHaveGreaterThanT<Types...> operator>(
+ const variant<Types...>& a, const variant<Types...>& b) {
+ return (a.index() != b.index())
+ ? (a.index() + 1) > (b.index() + 1)
+ : variant_internal::VisitIndices<sizeof...(Types)>::Run(
+ variant_internal::GreaterThanOp<Types...>{&a, &b},
+ a.index());
+}
+
+// Less-than or equal-to operator
+template <typename... Types>
+constexpr variant_internal::RequireAllHaveLessThanOrEqualT<Types...> operator<=(
+ const variant<Types...>& a, const variant<Types...>& b) {
+ return (a.index() != b.index())
+ ? (a.index() + 1) < (b.index() + 1)
+ : variant_internal::VisitIndices<sizeof...(Types)>::Run(
+ variant_internal::LessThanOrEqualsOp<Types...>{&a, &b},
+ a.index());
+}
+
+// Greater-than or equal-to operator
+template <typename... Types>
+constexpr variant_internal::RequireAllHaveGreaterThanOrEqualT<Types...>
+operator>=(const variant<Types...>& a, const variant<Types...>& b) {
+ return (a.index() != b.index())
+ ? (a.index() + 1) > (b.index() + 1)
+ : variant_internal::VisitIndices<sizeof...(Types)>::Run(
+ variant_internal::GreaterThanOrEqualsOp<Types...>{&a, &b},
+ a.index());
+}
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+namespace std {
+
+// hash()
+template <> // NOLINT
+struct hash<absl::monostate> {
+ std::size_t operator()(absl::monostate) const { return 0; }
+};
+
+template <class... T> // NOLINT
+struct hash<absl::variant<T...>>
+ : absl::variant_internal::VariantHashBase<absl::variant<T...>, void,
+ absl::remove_const_t<T>...> {};
+
+} // namespace std
+
+#endif // ABSL_USES_STD_VARIANT
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace variant_internal {
+
+// Helper visitor for converting a variant<Ts...>` into another type (mostly
+// variant) that can be constructed from any type.
+template <typename To>
+struct ConversionVisitor {
+ template <typename T>
+ To operator()(T&& v) const {
+ return To(std::forward<T>(v));
+ }
+};
+
+} // namespace variant_internal
+
+// ConvertVariantTo()
+//
+// Helper functions to convert an `absl::variant` to a variant of another set of
+// types, provided that the alternative type of the new variant type can be
+// converted from any type in the source variant.
+//
+// Example:
+//
+// absl::variant<name1, name2, float> InternalReq(const Req&);
+//
+// // name1 and name2 are convertible to name
+// absl::variant<name, float> ExternalReq(const Req& req) {
+// return absl::ConvertVariantTo<absl::variant<name, float>>(
+// InternalReq(req));
+// }
+template <typename To, typename Variant>
+To ConvertVariantTo(Variant&& variant) {
+ return absl::visit(variant_internal::ConversionVisitor<To>{},
+ std::forward<Variant>(variant));
+}
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_TYPES_VARIANT_H_
diff --git a/third_party/abseil/src/absl/types/variant_benchmark.cc b/third_party/abseil/src/absl/types/variant_benchmark.cc
new file mode 100644
index 0000000..350b175
--- /dev/null
+++ b/third_party/abseil/src/absl/types/variant_benchmark.cc
@@ -0,0 +1,222 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Unit tests for the variant template. The 'is' and 'IsEmpty' methods
+// of variant are not explicitly tested because they are used repeatedly
+// in building other tests. All other public variant methods should have
+// explicit tests.
+
+#include "absl/types/variant.h"
+
+#include <cstddef>
+#include <cstdlib>
+#include <string>
+#include <tuple>
+
+#include "benchmark/benchmark.h"
+#include "absl/utility/utility.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace {
+
+template <std::size_t I>
+struct VariantAlternative {
+ char member;
+};
+
+template <class Indices>
+struct VariantOfAlternativesImpl;
+
+template <std::size_t... Indices>
+struct VariantOfAlternativesImpl<absl::index_sequence<Indices...>> {
+ using type = absl::variant<VariantAlternative<Indices>...>;
+};
+
+template <std::size_t NumAlternatives>
+using VariantOfAlternatives = typename VariantOfAlternativesImpl<
+ absl::make_index_sequence<NumAlternatives>>::type;
+
+struct Empty {};
+
+template <class... T>
+void Ignore(T...) noexcept {}
+
+template <class T>
+Empty DoNotOptimizeAndReturnEmpty(T&& arg) noexcept {
+ benchmark::DoNotOptimize(arg);
+ return {};
+}
+
+struct VisitorApplier {
+ struct Visitor {
+ template <class... T>
+ void operator()(T&&... args) const noexcept {
+ Ignore(DoNotOptimizeAndReturnEmpty(args)...);
+ }
+ };
+
+ template <class... Vars>
+ void operator()(const Vars&... vars) const noexcept {
+ absl::visit(Visitor(), vars...);
+ }
+};
+
+template <std::size_t NumIndices, std::size_t CurrIndex = NumIndices - 1>
+struct MakeWithIndex {
+ using Variant = VariantOfAlternatives<NumIndices>;
+
+ static Variant Run(std::size_t index) {
+ return index == CurrIndex
+ ? Variant(absl::in_place_index_t<CurrIndex>())
+ : MakeWithIndex<NumIndices, CurrIndex - 1>::Run(index);
+ }
+};
+
+template <std::size_t NumIndices>
+struct MakeWithIndex<NumIndices, 0> {
+ using Variant = VariantOfAlternatives<NumIndices>;
+
+ static Variant Run(std::size_t /*index*/) { return Variant(); }
+};
+
+template <std::size_t NumIndices, class Dimensions>
+struct MakeVariantTuple;
+
+template <class T, std::size_t /*I*/>
+using always_t = T;
+
+template <std::size_t NumIndices>
+VariantOfAlternatives<NumIndices> MakeVariant(std::size_t dimension,
+ std::size_t index) {
+ return dimension == 0
+ ? MakeWithIndex<NumIndices>::Run(index % NumIndices)
+ : MakeVariant<NumIndices>(dimension - 1, index / NumIndices);
+}
+
+template <std::size_t NumIndices, std::size_t... Dimensions>
+struct MakeVariantTuple<NumIndices, absl::index_sequence<Dimensions...>> {
+ using VariantTuple =
+ std::tuple<always_t<VariantOfAlternatives<NumIndices>, Dimensions>...>;
+
+ static VariantTuple Run(int index) {
+ return std::make_tuple(MakeVariant<NumIndices>(Dimensions, index)...);
+ }
+};
+
+constexpr std::size_t integral_pow(std::size_t base, std::size_t power) {
+ return power == 0 ? 1 : base * integral_pow(base, power - 1);
+}
+
+template <std::size_t End, std::size_t I = 0>
+struct VisitTestBody {
+ template <class Vars, class State>
+ static bool Run(Vars& vars, State& state) {
+ if (state.KeepRunning()) {
+ absl::apply(VisitorApplier(), vars[I]);
+ return VisitTestBody<End, I + 1>::Run(vars, state);
+ }
+ return false;
+ }
+};
+
+template <std::size_t End>
+struct VisitTestBody<End, End> {
+ template <class Vars, class State>
+ static bool Run(Vars& /*vars*/, State& /*state*/) {
+ return true;
+ }
+};
+
+// Visit operations where branch prediction is likely to give a boost.
+template <std::size_t NumIndices, std::size_t NumDimensions = 1>
+void BM_RedundantVisit(benchmark::State& state) {
+ auto vars =
+ MakeVariantTuple<NumIndices, absl::make_index_sequence<NumDimensions>>::
+ Run(static_cast<std::size_t>(state.range(0)));
+
+ for (auto _ : state) { // NOLINT
+ benchmark::DoNotOptimize(vars);
+ absl::apply(VisitorApplier(), vars);
+ }
+}
+
+// Visit operations where branch prediction is unlikely to give a boost.
+template <std::size_t NumIndices, std::size_t NumDimensions = 1>
+void BM_Visit(benchmark::State& state) {
+ constexpr std::size_t num_possibilities =
+ integral_pow(NumIndices, NumDimensions);
+
+ using VariantTupleMaker =
+ MakeVariantTuple<NumIndices, absl::make_index_sequence<NumDimensions>>;
+ using Tuple = typename VariantTupleMaker::VariantTuple;
+
+ Tuple vars[num_possibilities];
+ for (std::size_t i = 0; i < num_possibilities; ++i)
+ vars[i] = VariantTupleMaker::Run(i);
+
+ while (VisitTestBody<num_possibilities>::Run(vars, state)) {
+ }
+}
+
+// Visitation
+// Each visit is on a different variant with a different active alternative)
+
+// Unary visit
+BENCHMARK_TEMPLATE(BM_Visit, 1);
+BENCHMARK_TEMPLATE(BM_Visit, 2);
+BENCHMARK_TEMPLATE(BM_Visit, 3);
+BENCHMARK_TEMPLATE(BM_Visit, 4);
+BENCHMARK_TEMPLATE(BM_Visit, 5);
+BENCHMARK_TEMPLATE(BM_Visit, 6);
+BENCHMARK_TEMPLATE(BM_Visit, 7);
+BENCHMARK_TEMPLATE(BM_Visit, 8);
+BENCHMARK_TEMPLATE(BM_Visit, 16);
+BENCHMARK_TEMPLATE(BM_Visit, 32);
+BENCHMARK_TEMPLATE(BM_Visit, 64);
+
+// Binary visit
+BENCHMARK_TEMPLATE(BM_Visit, 1, 2);
+BENCHMARK_TEMPLATE(BM_Visit, 2, 2);
+BENCHMARK_TEMPLATE(BM_Visit, 3, 2);
+BENCHMARK_TEMPLATE(BM_Visit, 4, 2);
+BENCHMARK_TEMPLATE(BM_Visit, 5, 2);
+
+// Ternary visit
+BENCHMARK_TEMPLATE(BM_Visit, 1, 3);
+BENCHMARK_TEMPLATE(BM_Visit, 2, 3);
+BENCHMARK_TEMPLATE(BM_Visit, 3, 3);
+
+// Quaternary visit
+BENCHMARK_TEMPLATE(BM_Visit, 1, 4);
+BENCHMARK_TEMPLATE(BM_Visit, 2, 4);
+
+// Redundant Visitation
+// Each visit consistently has the same alternative active
+
+// Unary visit
+BENCHMARK_TEMPLATE(BM_RedundantVisit, 1)->Arg(0);
+BENCHMARK_TEMPLATE(BM_RedundantVisit, 2)->DenseRange(0, 1);
+BENCHMARK_TEMPLATE(BM_RedundantVisit, 8)->DenseRange(0, 7);
+
+// Binary visit
+BENCHMARK_TEMPLATE(BM_RedundantVisit, 1, 2)->Arg(0);
+BENCHMARK_TEMPLATE(BM_RedundantVisit, 2, 2)
+ ->DenseRange(0, integral_pow(2, 2) - 1);
+BENCHMARK_TEMPLATE(BM_RedundantVisit, 4, 2)
+ ->DenseRange(0, integral_pow(4, 2) - 1);
+
+} // namespace
+ABSL_NAMESPACE_END
+} // namespace absl
diff --git a/third_party/abseil/src/absl/types/variant_exception_safety_test.cc b/third_party/abseil/src/absl/types/variant_exception_safety_test.cc
new file mode 100644
index 0000000..439c6e1
--- /dev/null
+++ b/third_party/abseil/src/absl/types/variant_exception_safety_test.cc
@@ -0,0 +1,532 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/types/variant.h"
+
+#include "absl/base/config.h"
+
+// This test is a no-op when absl::variant is an alias for std::variant and when
+// exceptions are not enabled.
+#if !defined(ABSL_USES_STD_VARIANT) && defined(ABSL_HAVE_EXCEPTIONS)
+
+#include <iostream>
+#include <memory>
+#include <utility>
+#include <vector>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/base/internal/exception_safety_testing.h"
+#include "absl/memory/memory.h"
+
+// See comment in absl/base/config.h
+#if !defined(ABSL_INTERNAL_MSVC_2017_DBG_MODE)
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace {
+
+using ::testing::MakeExceptionSafetyTester;
+using ::testing::strong_guarantee;
+using ::testing::TestNothrowOp;
+using ::testing::TestThrowingCtor;
+
+using Thrower = testing::ThrowingValue<>;
+using CopyNothrow = testing::ThrowingValue<testing::TypeSpec::kNoThrowCopy>;
+using MoveNothrow = testing::ThrowingValue<testing::TypeSpec::kNoThrowMove>;
+using ThrowingAlloc = testing::ThrowingAllocator<Thrower>;
+using ThrowerVec = std::vector<Thrower, ThrowingAlloc>;
+using ThrowingVariant =
+ absl::variant<Thrower, CopyNothrow, MoveNothrow, ThrowerVec>;
+
+struct ConversionException {};
+
+template <class T>
+struct ExceptionOnConversion {
+ operator T() const { // NOLINT
+ throw ConversionException();
+ }
+};
+
+// Forces a variant into the valueless by exception state.
+void ToValuelessByException(ThrowingVariant& v) { // NOLINT
+ try {
+ v.emplace<Thrower>();
+ v.emplace<Thrower>(ExceptionOnConversion<Thrower>());
+ } catch (const ConversionException&) {
+ // This space intentionally left blank.
+ }
+}
+
+// Check that variant is still in a usable state after an exception is thrown.
+testing::AssertionResult VariantInvariants(ThrowingVariant* v) {
+ using testing::AssertionFailure;
+ using testing::AssertionSuccess;
+
+ // Try using the active alternative
+ if (absl::holds_alternative<Thrower>(*v)) {
+ auto& t = absl::get<Thrower>(*v);
+ t = Thrower{-100};
+ if (t.Get() != -100) {
+ return AssertionFailure() << "Thrower should be assigned -100";
+ }
+ } else if (absl::holds_alternative<ThrowerVec>(*v)) {
+ auto& tv = absl::get<ThrowerVec>(*v);
+ tv.clear();
+ tv.emplace_back(-100);
+ if (tv.size() != 1 || tv[0].Get() != -100) {
+ return AssertionFailure() << "ThrowerVec should be {Thrower{-100}}";
+ }
+ } else if (absl::holds_alternative<CopyNothrow>(*v)) {
+ auto& t = absl::get<CopyNothrow>(*v);
+ t = CopyNothrow{-100};
+ if (t.Get() != -100) {
+ return AssertionFailure() << "CopyNothrow should be assigned -100";
+ }
+ } else if (absl::holds_alternative<MoveNothrow>(*v)) {
+ auto& t = absl::get<MoveNothrow>(*v);
+ t = MoveNothrow{-100};
+ if (t.Get() != -100) {
+ return AssertionFailure() << "MoveNothrow should be assigned -100";
+ }
+ }
+
+ // Try making variant valueless_by_exception
+ if (!v->valueless_by_exception()) ToValuelessByException(*v);
+ if (!v->valueless_by_exception()) {
+ return AssertionFailure() << "Variant should be valueless_by_exception";
+ }
+ try {
+ auto unused = absl::get<Thrower>(*v);
+ static_cast<void>(unused);
+ return AssertionFailure() << "Variant should not contain Thrower";
+ } catch (const absl::bad_variant_access&) {
+ } catch (...) {
+ return AssertionFailure() << "Unexpected exception throw from absl::get";
+ }
+
+ // Try using the variant
+ v->emplace<Thrower>(100);
+ if (!absl::holds_alternative<Thrower>(*v) ||
+ absl::get<Thrower>(*v) != Thrower(100)) {
+ return AssertionFailure() << "Variant should contain Thrower(100)";
+ }
+ v->emplace<ThrowerVec>({Thrower(100)});
+ if (!absl::holds_alternative<ThrowerVec>(*v) ||
+ absl::get<ThrowerVec>(*v)[0] != Thrower(100)) {
+ return AssertionFailure()
+ << "Variant should contain ThrowerVec{Thrower(100)}";
+ }
+ return AssertionSuccess();
+}
+
+template <typename... Args>
+Thrower ExpectedThrower(Args&&... args) {
+ return Thrower(42, args...);
+}
+
+ThrowerVec ExpectedThrowerVec() { return {Thrower(100), Thrower(200)}; }
+ThrowingVariant ValuelessByException() {
+ ThrowingVariant v;
+ ToValuelessByException(v);
+ return v;
+}
+ThrowingVariant WithThrower() { return Thrower(39); }
+ThrowingVariant WithThrowerVec() {
+ return ThrowerVec{Thrower(1), Thrower(2), Thrower(3)};
+}
+ThrowingVariant WithCopyNoThrow() { return CopyNothrow(39); }
+ThrowingVariant WithMoveNoThrow() { return MoveNothrow(39); }
+
+TEST(VariantExceptionSafetyTest, DefaultConstructor) {
+ TestThrowingCtor<ThrowingVariant>();
+}
+
+TEST(VariantExceptionSafetyTest, CopyConstructor) {
+ {
+ ThrowingVariant v(ExpectedThrower());
+ TestThrowingCtor<ThrowingVariant>(v);
+ }
+ {
+ ThrowingVariant v(ExpectedThrowerVec());
+ TestThrowingCtor<ThrowingVariant>(v);
+ }
+ {
+ ThrowingVariant v(ValuelessByException());
+ TestThrowingCtor<ThrowingVariant>(v);
+ }
+}
+
+TEST(VariantExceptionSafetyTest, MoveConstructor) {
+ {
+ ThrowingVariant v(ExpectedThrower());
+ TestThrowingCtor<ThrowingVariant>(std::move(v));
+ }
+ {
+ ThrowingVariant v(ExpectedThrowerVec());
+ TestThrowingCtor<ThrowingVariant>(std::move(v));
+ }
+ {
+ ThrowingVariant v(ValuelessByException());
+ TestThrowingCtor<ThrowingVariant>(std::move(v));
+ }
+}
+
+TEST(VariantExceptionSafetyTest, ValueConstructor) {
+ TestThrowingCtor<ThrowingVariant>(ExpectedThrower());
+ TestThrowingCtor<ThrowingVariant>(ExpectedThrowerVec());
+}
+
+TEST(VariantExceptionSafetyTest, InPlaceTypeConstructor) {
+ TestThrowingCtor<ThrowingVariant>(absl::in_place_type_t<Thrower>{},
+ ExpectedThrower());
+ TestThrowingCtor<ThrowingVariant>(absl::in_place_type_t<ThrowerVec>{},
+ ExpectedThrowerVec());
+}
+
+TEST(VariantExceptionSafetyTest, InPlaceIndexConstructor) {
+ TestThrowingCtor<ThrowingVariant>(absl::in_place_index_t<0>{},
+ ExpectedThrower());
+ TestThrowingCtor<ThrowingVariant>(absl::in_place_index_t<3>{},
+ ExpectedThrowerVec());
+}
+
+TEST(VariantExceptionSafetyTest, CopyAssign) {
+ // variant& operator=(const variant& rhs);
+ // Let j be rhs.index()
+ {
+ // - neither *this nor rhs holds a value
+ const ThrowingVariant rhs = ValuelessByException();
+ ThrowingVariant lhs = ValuelessByException();
+ EXPECT_TRUE(TestNothrowOp([&]() { lhs = rhs; }));
+ }
+ {
+ // - *this holds a value but rhs does not
+ const ThrowingVariant rhs = ValuelessByException();
+ ThrowingVariant lhs = WithThrower();
+ EXPECT_TRUE(TestNothrowOp([&]() { lhs = rhs; }));
+ }
+ // - index() == j
+ {
+ const ThrowingVariant rhs(ExpectedThrower());
+ auto tester =
+ MakeExceptionSafetyTester()
+ .WithInitialValue(WithThrower())
+ .WithOperation([&rhs](ThrowingVariant* lhs) { *lhs = rhs; });
+ EXPECT_TRUE(tester.WithContracts(VariantInvariants).Test());
+ EXPECT_FALSE(tester.WithContracts(strong_guarantee).Test());
+ }
+ {
+ const ThrowingVariant rhs(ExpectedThrowerVec());
+ auto tester =
+ MakeExceptionSafetyTester()
+ .WithInitialValue(WithThrowerVec())
+ .WithOperation([&rhs](ThrowingVariant* lhs) { *lhs = rhs; });
+ EXPECT_TRUE(tester.WithContracts(VariantInvariants).Test());
+ EXPECT_FALSE(tester.WithContracts(strong_guarantee).Test());
+ }
+ // libstdc++ std::variant has bugs on copy assignment regarding exception
+ // safety.
+#if !(defined(ABSL_USES_STD_VARIANT) && defined(__GLIBCXX__))
+ // index() != j
+ // if is_nothrow_copy_constructible_v<Tj> or
+ // !is_nothrow_move_constructible<Tj> is true, equivalent to
+ // emplace<j>(get<j>(rhs))
+ {
+ // is_nothrow_copy_constructible_v<Tj> == true
+ // should not throw because emplace() invokes Tj's copy ctor
+ // which should not throw.
+ const ThrowingVariant rhs(CopyNothrow{});
+ ThrowingVariant lhs = WithThrower();
+ EXPECT_TRUE(TestNothrowOp([&]() { lhs = rhs; }));
+ }
+ {
+ // is_nothrow_copy_constructible<Tj> == false &&
+ // is_nothrow_move_constructible<Tj> == false
+ // should provide basic guarantee because emplace() invokes Tj's copy ctor
+ // which may throw.
+ const ThrowingVariant rhs(ExpectedThrower());
+ auto tester =
+ MakeExceptionSafetyTester()
+ .WithInitialValue(WithCopyNoThrow())
+ .WithOperation([&rhs](ThrowingVariant* lhs) { *lhs = rhs; });
+ EXPECT_TRUE(tester
+ .WithContracts(VariantInvariants,
+ [](ThrowingVariant* lhs) {
+ return lhs->valueless_by_exception();
+ })
+ .Test());
+ EXPECT_FALSE(tester.WithContracts(strong_guarantee).Test());
+ }
+#endif // !(defined(ABSL_USES_STD_VARIANT) && defined(__GLIBCXX__))
+ {
+ // is_nothrow_copy_constructible_v<Tj> == false &&
+ // is_nothrow_move_constructible_v<Tj> == true
+ // should provide strong guarantee because it is equivalent to
+ // operator=(variant(rhs)) which creates a temporary then invoke the move
+ // ctor which shouldn't throw.
+ const ThrowingVariant rhs(MoveNothrow{});
+ EXPECT_TRUE(MakeExceptionSafetyTester()
+ .WithInitialValue(WithThrower())
+ .WithContracts(VariantInvariants, strong_guarantee)
+ .Test([&rhs](ThrowingVariant* lhs) { *lhs = rhs; }));
+ }
+}
+
+TEST(VariantExceptionSafetyTest, MoveAssign) {
+ // variant& operator=(variant&& rhs);
+ // Let j be rhs.index()
+ {
+ // - neither *this nor rhs holds a value
+ ThrowingVariant rhs = ValuelessByException();
+ ThrowingVariant lhs = ValuelessByException();
+ EXPECT_TRUE(TestNothrowOp([&]() { lhs = std::move(rhs); }));
+ }
+ {
+ // - *this holds a value but rhs does not
+ ThrowingVariant rhs = ValuelessByException();
+ ThrowingVariant lhs = WithThrower();
+ EXPECT_TRUE(TestNothrowOp([&]() { lhs = std::move(rhs); }));
+ }
+ {
+ // - index() == j
+ // assign get<j>(std::move(rhs)) to the value contained in *this.
+ // If an exception is thrown during call to Tj's move assignment, the state
+ // of the contained value is as defined by the exception safety guarantee of
+ // Tj's move assignment; index() will be j.
+ ThrowingVariant rhs(ExpectedThrower());
+ size_t j = rhs.index();
+ // Since Thrower's move assignment has basic guarantee, so should variant's.
+ auto tester = MakeExceptionSafetyTester()
+ .WithInitialValue(WithThrower())
+ .WithOperation([&](ThrowingVariant* lhs) {
+ auto copy = rhs;
+ *lhs = std::move(copy);
+ });
+ EXPECT_TRUE(tester
+ .WithContracts(
+ VariantInvariants,
+ [&](ThrowingVariant* lhs) { return lhs->index() == j; })
+ .Test());
+ EXPECT_FALSE(tester.WithContracts(strong_guarantee).Test());
+ }
+ {
+ // libstdc++ introduced a regression between 2018-09-25 and 2019-01-06.
+ // The fix is targeted for gcc-9.
+ // https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87431#c7
+ // https://gcc.gnu.org/viewcvs/gcc?view=revision&revision=267614
+#if !(defined(ABSL_USES_STD_VARIANT) && \
+ defined(_GLIBCXX_RELEASE) && _GLIBCXX_RELEASE == 8)
+ // - otherwise (index() != j), equivalent to
+ // emplace<j>(get<j>(std::move(rhs)))
+ // - If an exception is thrown during the call to Tj's move construction
+ // (with j being rhs.index()), the variant will hold no value.
+ ThrowingVariant rhs(CopyNothrow{});
+ EXPECT_TRUE(MakeExceptionSafetyTester()
+ .WithInitialValue(WithThrower())
+ .WithContracts(VariantInvariants,
+ [](ThrowingVariant* lhs) {
+ return lhs->valueless_by_exception();
+ })
+ .Test([&](ThrowingVariant* lhs) {
+ auto copy = rhs;
+ *lhs = std::move(copy);
+ }));
+#endif // !(defined(ABSL_USES_STD_VARIANT) &&
+ // defined(_GLIBCXX_RELEASE) && _GLIBCXX_RELEASE == 8)
+ }
+}
+
+TEST(VariantExceptionSafetyTest, ValueAssign) {
+ // template<class T> variant& operator=(T&& t);
+ // Let Tj be the type that is selected by overload resolution to be assigned.
+ {
+ // If *this holds a Tj, assigns std::forward<T>(t) to the value contained in
+ // *this. If an exception is thrown during the assignment of
+ // std::forward<T>(t) to the value contained in *this, the state of the
+ // contained value and t are as defined by the exception safety guarantee of
+ // the assignment expression; valueless_by_exception() will be false.
+ // Since Thrower's copy/move assignment has basic guarantee, so should
+ // variant's.
+ Thrower rhs = ExpectedThrower();
+ // copy assign
+ auto copy_tester =
+ MakeExceptionSafetyTester()
+ .WithInitialValue(WithThrower())
+ .WithOperation([rhs](ThrowingVariant* lhs) { *lhs = rhs; });
+ EXPECT_TRUE(copy_tester
+ .WithContracts(VariantInvariants,
+ [](ThrowingVariant* lhs) {
+ return !lhs->valueless_by_exception();
+ })
+ .Test());
+ EXPECT_FALSE(copy_tester.WithContracts(strong_guarantee).Test());
+ // move assign
+ auto move_tester = MakeExceptionSafetyTester()
+ .WithInitialValue(WithThrower())
+ .WithOperation([&](ThrowingVariant* lhs) {
+ auto copy = rhs;
+ *lhs = std::move(copy);
+ });
+ EXPECT_TRUE(move_tester
+ .WithContracts(VariantInvariants,
+ [](ThrowingVariant* lhs) {
+ return !lhs->valueless_by_exception();
+ })
+ .Test());
+
+ EXPECT_FALSE(move_tester.WithContracts(strong_guarantee).Test());
+ }
+ // Otherwise (*this holds something else), if is_nothrow_constructible_v<Tj,
+ // T> || !is_nothrow_move_constructible_v<Tj> is true, equivalent to
+ // emplace<j>(std::forward<T>(t)).
+ // We simplify the test by letting T = `const Tj&` or `Tj&&`, so we can reuse
+ // the CopyNothrow and MoveNothrow types.
+
+ // if is_nothrow_constructible_v<Tj, T>
+ // (i.e. is_nothrow_copy/move_constructible_v<Tj>) is true, emplace() just
+ // invokes the copy/move constructor and it should not throw.
+ {
+ const CopyNothrow rhs;
+ ThrowingVariant lhs = WithThrower();
+ EXPECT_TRUE(TestNothrowOp([&]() { lhs = rhs; }));
+ }
+ {
+ MoveNothrow rhs;
+ ThrowingVariant lhs = WithThrower();
+ EXPECT_TRUE(TestNothrowOp([&]() { lhs = std::move(rhs); }));
+ }
+ // if is_nothrow_constructible_v<Tj, T> == false &&
+ // is_nothrow_move_constructible<Tj> == false
+ // emplace() invokes the copy/move constructor which may throw so it should
+ // provide basic guarantee and variant object might not hold a value.
+ {
+ Thrower rhs = ExpectedThrower();
+ // copy
+ auto copy_tester =
+ MakeExceptionSafetyTester()
+ .WithInitialValue(WithCopyNoThrow())
+ .WithOperation([&rhs](ThrowingVariant* lhs) { *lhs = rhs; });
+ EXPECT_TRUE(copy_tester
+ .WithContracts(VariantInvariants,
+ [](ThrowingVariant* lhs) {
+ return lhs->valueless_by_exception();
+ })
+ .Test());
+ EXPECT_FALSE(copy_tester.WithContracts(strong_guarantee).Test());
+ // move
+ auto move_tester = MakeExceptionSafetyTester()
+ .WithInitialValue(WithCopyNoThrow())
+ .WithOperation([](ThrowingVariant* lhs) {
+ *lhs = ExpectedThrower(testing::nothrow_ctor);
+ });
+ EXPECT_TRUE(move_tester
+ .WithContracts(VariantInvariants,
+ [](ThrowingVariant* lhs) {
+ return lhs->valueless_by_exception();
+ })
+ .Test());
+ EXPECT_FALSE(move_tester.WithContracts(strong_guarantee).Test());
+ }
+ // Otherwise (if is_nothrow_constructible_v<Tj, T> == false &&
+ // is_nothrow_move_constructible<Tj> == true),
+ // equivalent to operator=(variant(std::forward<T>(t)))
+ // This should have strong guarantee because it creates a temporary variant
+ // and operator=(variant&&) invokes Tj's move ctor which doesn't throw.
+ // libstdc++ std::variant has bugs on conversion assignment regarding
+ // exception safety.
+#if !(defined(ABSL_USES_STD_VARIANT) && defined(__GLIBCXX__))
+ {
+ MoveNothrow rhs;
+ EXPECT_TRUE(MakeExceptionSafetyTester()
+ .WithInitialValue(WithThrower())
+ .WithContracts(VariantInvariants, strong_guarantee)
+ .Test([&rhs](ThrowingVariant* lhs) { *lhs = rhs; }));
+ }
+#endif // !(defined(ABSL_USES_STD_VARIANT) && defined(__GLIBCXX__))
+}
+
+TEST(VariantExceptionSafetyTest, Emplace) {
+ // If an exception during the initialization of the contained value, the
+ // variant might not hold a value. The standard requires emplace() to provide
+ // only basic guarantee.
+ {
+ Thrower args = ExpectedThrower();
+ auto tester = MakeExceptionSafetyTester()
+ .WithInitialValue(WithThrower())
+ .WithOperation([&args](ThrowingVariant* v) {
+ v->emplace<Thrower>(args);
+ });
+ EXPECT_TRUE(tester
+ .WithContracts(VariantInvariants,
+ [](ThrowingVariant* v) {
+ return v->valueless_by_exception();
+ })
+ .Test());
+ EXPECT_FALSE(tester.WithContracts(strong_guarantee).Test());
+ }
+}
+
+TEST(VariantExceptionSafetyTest, Swap) {
+ // if both are valueless_by_exception(), no effect
+ {
+ ThrowingVariant rhs = ValuelessByException();
+ ThrowingVariant lhs = ValuelessByException();
+ EXPECT_TRUE(TestNothrowOp([&]() { lhs.swap(rhs); }));
+ }
+ // if index() == rhs.index(), calls swap(get<i>(*this), get<i>(rhs))
+ // where i is index().
+ {
+ ThrowingVariant rhs = ExpectedThrower();
+ EXPECT_TRUE(MakeExceptionSafetyTester()
+ .WithInitialValue(WithThrower())
+ .WithContracts(VariantInvariants)
+ .Test([&](ThrowingVariant* lhs) {
+ auto copy = rhs;
+ lhs->swap(copy);
+ }));
+ }
+ // Otherwise, exchanges the value of rhs and *this. The exception safety
+ // involves variant in moved-from state which is not specified in the
+ // standard, and since swap is 3-step it's impossible for it to provide a
+ // overall strong guarantee. So, we are only checking basic guarantee here.
+ {
+ ThrowingVariant rhs = ExpectedThrower();
+ EXPECT_TRUE(MakeExceptionSafetyTester()
+ .WithInitialValue(WithCopyNoThrow())
+ .WithContracts(VariantInvariants)
+ .Test([&](ThrowingVariant* lhs) {
+ auto copy = rhs;
+ lhs->swap(copy);
+ }));
+ }
+ {
+ ThrowingVariant rhs = ExpectedThrower();
+ EXPECT_TRUE(MakeExceptionSafetyTester()
+ .WithInitialValue(WithCopyNoThrow())
+ .WithContracts(VariantInvariants)
+ .Test([&](ThrowingVariant* lhs) {
+ auto copy = rhs;
+ copy.swap(*lhs);
+ }));
+ }
+}
+
+} // namespace
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // !defined(ABSL_INTERNAL_MSVC_2017_DBG_MODE)
+
+#endif // #if !defined(ABSL_USES_STD_VARIANT) && defined(ABSL_HAVE_EXCEPTIONS)
diff --git a/third_party/abseil/src/absl/types/variant_test.cc b/third_party/abseil/src/absl/types/variant_test.cc
new file mode 100644
index 0000000..cf23733
--- /dev/null
+++ b/third_party/abseil/src/absl/types/variant_test.cc
@@ -0,0 +1,2718 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Unit tests for the variant template. The 'is' and 'IsEmpty' methods
+// of variant are not explicitly tested because they are used repeatedly
+// in building other tests. All other public variant methods should have
+// explicit tests.
+
+#include "absl/types/variant.h"
+
+// This test is a no-op when absl::variant is an alias for std::variant.
+#if !defined(ABSL_USES_STD_VARIANT)
+
+#include <algorithm>
+#include <cstddef>
+#include <functional>
+#include <initializer_list>
+#include <memory>
+#include <ostream>
+#include <queue>
+#include <type_traits>
+#include <unordered_set>
+#include <utility>
+#include <vector>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/base/config.h"
+#include "absl/base/port.h"
+#include "absl/memory/memory.h"
+#include "absl/meta/type_traits.h"
+#include "absl/strings/string_view.h"
+
+#ifdef ABSL_HAVE_EXCEPTIONS
+
+#define ABSL_VARIANT_TEST_EXPECT_FAIL(expr, exception_t, text) \
+ EXPECT_THROW(expr, exception_t)
+
+#else
+
+#define ABSL_VARIANT_TEST_EXPECT_FAIL(expr, exception_t, text) \
+ EXPECT_DEATH_IF_SUPPORTED(expr, text)
+
+#endif // ABSL_HAVE_EXCEPTIONS
+
+#define ABSL_VARIANT_TEST_EXPECT_BAD_VARIANT_ACCESS(...) \
+ ABSL_VARIANT_TEST_EXPECT_FAIL((void)(__VA_ARGS__), absl::bad_variant_access, \
+ "Bad variant access")
+
+struct Hashable {};
+
+namespace std {
+template <>
+struct hash<Hashable> {
+ size_t operator()(const Hashable&);
+};
+} // namespace std
+
+struct NonHashable {};
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace {
+
+using ::testing::DoubleEq;
+using ::testing::Pointee;
+using ::testing::VariantWith;
+
+struct MoveCanThrow {
+ MoveCanThrow() : v(0) {}
+ MoveCanThrow(int v) : v(v) {} // NOLINT(runtime/explicit)
+ MoveCanThrow(const MoveCanThrow& other) : v(other.v) {}
+ MoveCanThrow& operator=(const MoveCanThrow& /*other*/) { return *this; }
+ int v;
+};
+
+bool operator==(MoveCanThrow lhs, MoveCanThrow rhs) { return lhs.v == rhs.v; }
+bool operator!=(MoveCanThrow lhs, MoveCanThrow rhs) { return lhs.v != rhs.v; }
+bool operator<(MoveCanThrow lhs, MoveCanThrow rhs) { return lhs.v < rhs.v; }
+bool operator<=(MoveCanThrow lhs, MoveCanThrow rhs) { return lhs.v <= rhs.v; }
+bool operator>=(MoveCanThrow lhs, MoveCanThrow rhs) { return lhs.v >= rhs.v; }
+bool operator>(MoveCanThrow lhs, MoveCanThrow rhs) { return lhs.v > rhs.v; }
+
+// This helper class allows us to determine if it was swapped with std::swap()
+// or with its friend swap() function.
+struct SpecialSwap {
+ explicit SpecialSwap(int i) : i(i) {}
+ friend void swap(SpecialSwap& a, SpecialSwap& b) {
+ a.special_swap = b.special_swap = true;
+ std::swap(a.i, b.i);
+ }
+ bool operator==(SpecialSwap other) const { return i == other.i; }
+ int i;
+ bool special_swap = false;
+};
+
+struct MoveOnlyWithListConstructor {
+ MoveOnlyWithListConstructor() = default;
+ explicit MoveOnlyWithListConstructor(std::initializer_list<int> /*ilist*/,
+ int value)
+ : value(value) {}
+ MoveOnlyWithListConstructor(MoveOnlyWithListConstructor&&) = default;
+ MoveOnlyWithListConstructor& operator=(MoveOnlyWithListConstructor&&) =
+ default;
+
+ int value = 0;
+};
+
+#ifdef ABSL_HAVE_EXCEPTIONS
+
+struct ConversionException {};
+
+template <class T>
+struct ExceptionOnConversion {
+ operator T() const { // NOLINT(runtime/explicit)
+ throw ConversionException();
+ }
+};
+
+// Forces a variant into the valueless by exception state.
+template <class H, class... T>
+void ToValuelessByException(absl::variant<H, T...>& v) { // NOLINT
+ try {
+ v.template emplace<0>(ExceptionOnConversion<H>());
+ } catch (ConversionException& /*e*/) {
+ // This space intentionally left blank.
+ }
+}
+
+#endif // ABSL_HAVE_EXCEPTIONS
+
+// An indexed sequence of distinct structures holding a single
+// value of type T
+template<typename T, size_t N>
+struct ValueHolder {
+ explicit ValueHolder(const T& x) : value(x) {}
+ typedef T value_type;
+ value_type value;
+ static const size_t kIndex = N;
+};
+template<typename T, size_t N>
+const size_t ValueHolder<T, N>::kIndex;
+
+// The following three functions make ValueHolder compatible with
+// EXPECT_EQ and EXPECT_NE
+template<typename T, size_t N>
+inline bool operator==(const ValueHolder<T, N>& left,
+ const ValueHolder<T, N>& right) {
+ return left.value == right.value;
+}
+
+template<typename T, size_t N>
+inline bool operator!=(const ValueHolder<T, N>& left,
+ const ValueHolder<T, N>& right) {
+ return left.value != right.value;
+}
+
+template<typename T, size_t N>
+inline std::ostream& operator<<(
+ std::ostream& stream, const ValueHolder<T, N>& object) {
+ return stream << object.value;
+}
+
+// Makes a variant holding twelve uniquely typed T wrappers.
+template<typename T>
+struct VariantFactory {
+ typedef variant<ValueHolder<T, 1>, ValueHolder<T, 2>, ValueHolder<T, 3>,
+ ValueHolder<T, 4>>
+ Type;
+};
+
+// A typelist in 1:1 with VariantFactory, to use type driven unit tests.
+typedef ::testing::Types<ValueHolder<size_t, 1>, ValueHolder<size_t, 2>,
+ ValueHolder<size_t, 3>,
+ ValueHolder<size_t, 4>> VariantTypes;
+
+// Increments the provided counter pointer in the destructor
+struct IncrementInDtor {
+ explicit IncrementInDtor(int* counter) : counter(counter) {}
+ ~IncrementInDtor() { *counter += 1; }
+ int* counter;
+};
+
+struct IncrementInDtorCopyCanThrow {
+ explicit IncrementInDtorCopyCanThrow(int* counter) : counter(counter) {}
+ IncrementInDtorCopyCanThrow(IncrementInDtorCopyCanThrow&& other) noexcept =
+ default;
+ IncrementInDtorCopyCanThrow(const IncrementInDtorCopyCanThrow& other)
+ : counter(other.counter) {}
+ IncrementInDtorCopyCanThrow& operator=(
+ IncrementInDtorCopyCanThrow&&) noexcept = default;
+ IncrementInDtorCopyCanThrow& operator=(
+ IncrementInDtorCopyCanThrow const& other) {
+ counter = other.counter;
+ return *this;
+ }
+ ~IncrementInDtorCopyCanThrow() { *counter += 1; }
+ int* counter;
+};
+
+// This is defined so operator== for ValueHolder<IncrementInDtor> will
+// return true if two IncrementInDtor objects increment the same
+// counter
+inline bool operator==(const IncrementInDtor& left,
+ const IncrementInDtor& right) {
+ return left.counter == right.counter;
+}
+
+// This is defined so EXPECT_EQ can work with IncrementInDtor
+inline std::ostream& operator<<(
+ std::ostream& stream, const IncrementInDtor& object) {
+ return stream << object.counter;
+}
+
+// A class that can be copied, but not assigned.
+class CopyNoAssign {
+ public:
+ explicit CopyNoAssign(int value) : foo(value) {}
+ CopyNoAssign(const CopyNoAssign& other) : foo(other.foo) {}
+ int foo;
+ private:
+ const CopyNoAssign& operator=(const CopyNoAssign&);
+};
+
+// A class that can neither be copied nor assigned. We provide
+// overloads for the constructor with up to four parameters so we can
+// test the overloads of variant::emplace.
+class NonCopyable {
+ public:
+ NonCopyable()
+ : value(0) {}
+ explicit NonCopyable(int value1)
+ : value(value1) {}
+
+ NonCopyable(int value1, int value2)
+ : value(value1 + value2) {}
+
+ NonCopyable(int value1, int value2, int value3)
+ : value(value1 + value2 + value3) {}
+
+ NonCopyable(int value1, int value2, int value3, int value4)
+ : value(value1 + value2 + value3 + value4) {}
+ NonCopyable(const NonCopyable&) = delete;
+ NonCopyable& operator=(const NonCopyable&) = delete;
+ int value;
+};
+
+// A typed test and typed test case over the VariantTypes typelist,
+// from which we derive a number of tests that will execute for one of
+// each type.
+template <typename T>
+class VariantTypesTest : public ::testing::Test {};
+TYPED_TEST_SUITE(VariantTypesTest, VariantTypes);
+
+////////////////////
+// [variant.ctor] //
+////////////////////
+
+struct NonNoexceptDefaultConstructible {
+ NonNoexceptDefaultConstructible() {}
+ int value = 5;
+};
+
+struct NonDefaultConstructible {
+ NonDefaultConstructible() = delete;
+};
+
+TEST(VariantTest, TestDefaultConstructor) {
+ {
+ using X = variant<int>;
+ constexpr variant<int> x{};
+ ASSERT_FALSE(x.valueless_by_exception());
+ ASSERT_EQ(0, x.index());
+ EXPECT_EQ(0, absl::get<0>(x));
+ EXPECT_TRUE(std::is_nothrow_default_constructible<X>::value);
+ }
+
+ {
+ using X = variant<NonNoexceptDefaultConstructible>;
+ X x{};
+ ASSERT_FALSE(x.valueless_by_exception());
+ ASSERT_EQ(0, x.index());
+ EXPECT_EQ(5, absl::get<0>(x).value);
+ EXPECT_FALSE(std::is_nothrow_default_constructible<X>::value);
+ }
+
+ {
+ using X = variant<int, NonNoexceptDefaultConstructible>;
+ X x{};
+ ASSERT_FALSE(x.valueless_by_exception());
+ ASSERT_EQ(0, x.index());
+ EXPECT_EQ(0, absl::get<0>(x));
+ EXPECT_TRUE(std::is_nothrow_default_constructible<X>::value);
+ }
+
+ {
+ using X = variant<NonNoexceptDefaultConstructible, int>;
+ X x{};
+ ASSERT_FALSE(x.valueless_by_exception());
+ ASSERT_EQ(0, x.index());
+ EXPECT_EQ(5, absl::get<0>(x).value);
+ EXPECT_FALSE(std::is_nothrow_default_constructible<X>::value);
+ }
+ EXPECT_FALSE(
+ std::is_default_constructible<variant<NonDefaultConstructible>>::value);
+ EXPECT_FALSE((std::is_default_constructible<
+ variant<NonDefaultConstructible, int>>::value));
+ EXPECT_TRUE((std::is_default_constructible<
+ variant<int, NonDefaultConstructible>>::value));
+}
+
+// Test that for each slot, copy constructing a variant with that type
+// produces a sensible object that correctly reports its type, and
+// that copies the provided value.
+TYPED_TEST(VariantTypesTest, TestCopyCtor) {
+ typedef typename VariantFactory<typename TypeParam::value_type>::Type Variant;
+ using value_type1 = absl::variant_alternative_t<0, Variant>;
+ using value_type2 = absl::variant_alternative_t<1, Variant>;
+ using value_type3 = absl::variant_alternative_t<2, Variant>;
+ using value_type4 = absl::variant_alternative_t<3, Variant>;
+ const TypeParam value(TypeParam::kIndex);
+ Variant original(value);
+ Variant copied(original);
+ EXPECT_TRUE(absl::holds_alternative<value_type1>(copied) ||
+ TypeParam::kIndex != 1);
+ EXPECT_TRUE(absl::holds_alternative<value_type2>(copied) ||
+ TypeParam::kIndex != 2);
+ EXPECT_TRUE(absl::holds_alternative<value_type3>(copied) ||
+ TypeParam::kIndex != 3);
+ EXPECT_TRUE(absl::holds_alternative<value_type4>(copied) ||
+ TypeParam::kIndex != 4);
+ EXPECT_TRUE((absl::get_if<value_type1>(&original) ==
+ absl::get_if<value_type1>(&copied)) ||
+ TypeParam::kIndex == 1);
+ EXPECT_TRUE((absl::get_if<value_type2>(&original) ==
+ absl::get_if<value_type2>(&copied)) ||
+ TypeParam::kIndex == 2);
+ EXPECT_TRUE((absl::get_if<value_type3>(&original) ==
+ absl::get_if<value_type3>(&copied)) ||
+ TypeParam::kIndex == 3);
+ EXPECT_TRUE((absl::get_if<value_type4>(&original) ==
+ absl::get_if<value_type4>(&copied)) ||
+ TypeParam::kIndex == 4);
+ EXPECT_TRUE((absl::get_if<value_type1>(&original) ==
+ absl::get_if<value_type1>(&copied)) ||
+ TypeParam::kIndex == 1);
+ EXPECT_TRUE((absl::get_if<value_type2>(&original) ==
+ absl::get_if<value_type2>(&copied)) ||
+ TypeParam::kIndex == 2);
+ EXPECT_TRUE((absl::get_if<value_type3>(&original) ==
+ absl::get_if<value_type3>(&copied)) ||
+ TypeParam::kIndex == 3);
+ EXPECT_TRUE((absl::get_if<value_type4>(&original) ==
+ absl::get_if<value_type4>(&copied)) ||
+ TypeParam::kIndex == 4);
+ const TypeParam* ovalptr = absl::get_if<TypeParam>(&original);
+ const TypeParam* cvalptr = absl::get_if<TypeParam>(&copied);
+ ASSERT_TRUE(ovalptr != nullptr);
+ ASSERT_TRUE(cvalptr != nullptr);
+ EXPECT_EQ(*ovalptr, *cvalptr);
+ TypeParam* mutable_ovalptr = absl::get_if<TypeParam>(&original);
+ TypeParam* mutable_cvalptr = absl::get_if<TypeParam>(&copied);
+ ASSERT_TRUE(mutable_ovalptr != nullptr);
+ ASSERT_TRUE(mutable_cvalptr != nullptr);
+ EXPECT_EQ(*mutable_ovalptr, *mutable_cvalptr);
+}
+
+template <class>
+struct MoveOnly {
+ MoveOnly() = default;
+ explicit MoveOnly(int value) : value(value) {}
+ MoveOnly(MoveOnly&&) = default;
+ MoveOnly& operator=(MoveOnly&&) = default;
+ int value = 5;
+};
+
+TEST(VariantTest, TestMoveConstruct) {
+ using V = variant<MoveOnly<class A>, MoveOnly<class B>, MoveOnly<class C>>;
+
+ V v(in_place_index<1>, 10);
+ V v2 = absl::move(v);
+ EXPECT_EQ(10, absl::get<1>(v2).value);
+}
+
+// Used internally to emulate missing triviality traits for tests.
+template <class T>
+union SingleUnion {
+ T member;
+};
+
+// NOTE: These don't work with types that can't be union members.
+// They are just for testing.
+template <class T>
+struct is_trivially_move_constructible
+ : std::is_move_constructible<SingleUnion<T>>::type {};
+
+template <class T>
+struct is_trivially_move_assignable
+ : absl::is_move_assignable<SingleUnion<T>>::type {};
+
+TEST(VariantTest, NothrowMoveConstructible) {
+ // Verify that variant is nothrow move constructible iff its template
+ // arguments are.
+ using U = std::unique_ptr<int>;
+ struct E {
+ E(E&&) {}
+ };
+ static_assert(std::is_nothrow_move_constructible<variant<U>>::value, "");
+ static_assert(std::is_nothrow_move_constructible<variant<U, int>>::value, "");
+ static_assert(!std::is_nothrow_move_constructible<variant<U, E>>::value, "");
+}
+
+// Test that for each slot, constructing a variant with that type
+// produces a sensible object that correctly reports its type, and
+// that copies the provided value.
+TYPED_TEST(VariantTypesTest, TestValueCtor) {
+ typedef typename VariantFactory<typename TypeParam::value_type>::Type Variant;
+ using value_type1 = absl::variant_alternative_t<0, Variant>;
+ using value_type2 = absl::variant_alternative_t<1, Variant>;
+ using value_type3 = absl::variant_alternative_t<2, Variant>;
+ using value_type4 = absl::variant_alternative_t<3, Variant>;
+ const TypeParam value(TypeParam::kIndex);
+ Variant v(value);
+ EXPECT_TRUE(absl::holds_alternative<value_type1>(v) ||
+ TypeParam::kIndex != 1);
+ EXPECT_TRUE(absl::holds_alternative<value_type2>(v) ||
+ TypeParam::kIndex != 2);
+ EXPECT_TRUE(absl::holds_alternative<value_type3>(v) ||
+ TypeParam::kIndex != 3);
+ EXPECT_TRUE(absl::holds_alternative<value_type4>(v) ||
+ TypeParam::kIndex != 4);
+ EXPECT_TRUE(nullptr != absl::get_if<value_type1>(&v) ||
+ TypeParam::kIndex != 1);
+ EXPECT_TRUE(nullptr != absl::get_if<value_type2>(&v) ||
+ TypeParam::kIndex != 2);
+ EXPECT_TRUE(nullptr != absl::get_if<value_type3>(&v) ||
+ TypeParam::kIndex != 3);
+ EXPECT_TRUE(nullptr != absl::get_if<value_type4>(&v) ||
+ TypeParam::kIndex != 4);
+ EXPECT_TRUE(nullptr != absl::get_if<value_type1>(&v) ||
+ TypeParam::kIndex != 1);
+ EXPECT_TRUE(nullptr != absl::get_if<value_type2>(&v) ||
+ TypeParam::kIndex != 2);
+ EXPECT_TRUE(nullptr != absl::get_if<value_type3>(&v) ||
+ TypeParam::kIndex != 3);
+ EXPECT_TRUE(nullptr != absl::get_if<value_type4>(&v) ||
+ TypeParam::kIndex != 4);
+ const TypeParam* valptr = absl::get_if<TypeParam>(&v);
+ ASSERT_TRUE(nullptr != valptr);
+ EXPECT_EQ(value.value, valptr->value);
+ const TypeParam* mutable_valptr = absl::get_if<TypeParam>(&v);
+ ASSERT_TRUE(nullptr != mutable_valptr);
+ EXPECT_EQ(value.value, mutable_valptr->value);
+}
+
+TEST(VariantTest, AmbiguousValueConstructor) {
+ EXPECT_FALSE((std::is_convertible<int, absl::variant<int, int>>::value));
+ EXPECT_FALSE((std::is_constructible<absl::variant<int, int>, int>::value));
+}
+
+TEST(VariantTest, InPlaceType) {
+ using Var = variant<int, std::string, NonCopyable, std::vector<int>>;
+
+ Var v1(in_place_type_t<int>(), 7);
+ ASSERT_TRUE(absl::holds_alternative<int>(v1));
+ EXPECT_EQ(7, absl::get<int>(v1));
+
+ Var v2(in_place_type_t<std::string>(), "ABC");
+ ASSERT_TRUE(absl::holds_alternative<std::string>(v2));
+ EXPECT_EQ("ABC", absl::get<std::string>(v2));
+
+ Var v3(in_place_type_t<std::string>(), "ABC", 2);
+ ASSERT_TRUE(absl::holds_alternative<std::string>(v3));
+ EXPECT_EQ("AB", absl::get<std::string>(v3));
+
+ Var v4(in_place_type_t<NonCopyable>{});
+ ASSERT_TRUE(absl::holds_alternative<NonCopyable>(v4));
+
+ Var v5(in_place_type_t<std::vector<int>>(), {1, 2, 3});
+ ASSERT_TRUE(absl::holds_alternative<std::vector<int>>(v5));
+ EXPECT_THAT(absl::get<std::vector<int>>(v5), ::testing::ElementsAre(1, 2, 3));
+}
+
+TEST(VariantTest, InPlaceTypeVariableTemplate) {
+ using Var = variant<int, std::string, NonCopyable, std::vector<int>>;
+
+ Var v1(in_place_type<int>, 7);
+ ASSERT_TRUE(absl::holds_alternative<int>(v1));
+ EXPECT_EQ(7, absl::get<int>(v1));
+
+ Var v2(in_place_type<std::string>, "ABC");
+ ASSERT_TRUE(absl::holds_alternative<std::string>(v2));
+ EXPECT_EQ("ABC", absl::get<std::string>(v2));
+
+ Var v3(in_place_type<std::string>, "ABC", 2);
+ ASSERT_TRUE(absl::holds_alternative<std::string>(v3));
+ EXPECT_EQ("AB", absl::get<std::string>(v3));
+
+ Var v4(in_place_type<NonCopyable>);
+ ASSERT_TRUE(absl::holds_alternative<NonCopyable>(v4));
+
+ Var v5(in_place_type<std::vector<int>>, {1, 2, 3});
+ ASSERT_TRUE(absl::holds_alternative<std::vector<int>>(v5));
+ EXPECT_THAT(absl::get<std::vector<int>>(v5), ::testing::ElementsAre(1, 2, 3));
+}
+
+TEST(VariantTest, InPlaceTypeInitializerList) {
+ using Var =
+ variant<int, std::string, NonCopyable, MoveOnlyWithListConstructor>;
+
+ Var v1(in_place_type_t<MoveOnlyWithListConstructor>(), {1, 2, 3, 4, 5}, 6);
+ ASSERT_TRUE(absl::holds_alternative<MoveOnlyWithListConstructor>(v1));
+ EXPECT_EQ(6, absl::get<MoveOnlyWithListConstructor>(v1).value);
+}
+
+TEST(VariantTest, InPlaceTypeInitializerListVariabletemplate) {
+ using Var =
+ variant<int, std::string, NonCopyable, MoveOnlyWithListConstructor>;
+
+ Var v1(in_place_type<MoveOnlyWithListConstructor>, {1, 2, 3, 4, 5}, 6);
+ ASSERT_TRUE(absl::holds_alternative<MoveOnlyWithListConstructor>(v1));
+ EXPECT_EQ(6, absl::get<MoveOnlyWithListConstructor>(v1).value);
+}
+
+TEST(VariantTest, InPlaceIndex) {
+ using Var = variant<int, std::string, NonCopyable, std::vector<int>>;
+
+ Var v1(in_place_index_t<0>(), 7);
+ ASSERT_TRUE(absl::holds_alternative<int>(v1));
+ EXPECT_EQ(7, absl::get<int>(v1));
+
+ Var v2(in_place_index_t<1>(), "ABC");
+ ASSERT_TRUE(absl::holds_alternative<std::string>(v2));
+ EXPECT_EQ("ABC", absl::get<std::string>(v2));
+
+ Var v3(in_place_index_t<1>(), "ABC", 2);
+ ASSERT_TRUE(absl::holds_alternative<std::string>(v3));
+ EXPECT_EQ("AB", absl::get<std::string>(v3));
+
+ Var v4(in_place_index_t<2>{});
+ EXPECT_TRUE(absl::holds_alternative<NonCopyable>(v4));
+
+ // Verify that a variant with only non-copyables can still be constructed.
+ EXPECT_TRUE(absl::holds_alternative<NonCopyable>(
+ variant<NonCopyable>(in_place_index_t<0>{})));
+
+ Var v5(in_place_index_t<3>(), {1, 2, 3});
+ ASSERT_TRUE(absl::holds_alternative<std::vector<int>>(v5));
+ EXPECT_THAT(absl::get<std::vector<int>>(v5), ::testing::ElementsAre(1, 2, 3));
+}
+
+TEST(VariantTest, InPlaceIndexVariableTemplate) {
+ using Var = variant<int, std::string, NonCopyable, std::vector<int>>;
+
+ Var v1(in_place_index<0>, 7);
+ ASSERT_TRUE(absl::holds_alternative<int>(v1));
+ EXPECT_EQ(7, absl::get<int>(v1));
+
+ Var v2(in_place_index<1>, "ABC");
+ ASSERT_TRUE(absl::holds_alternative<std::string>(v2));
+ EXPECT_EQ("ABC", absl::get<std::string>(v2));
+
+ Var v3(in_place_index<1>, "ABC", 2);
+ ASSERT_TRUE(absl::holds_alternative<std::string>(v3));
+ EXPECT_EQ("AB", absl::get<std::string>(v3));
+
+ Var v4(in_place_index<2>);
+ EXPECT_TRUE(absl::holds_alternative<NonCopyable>(v4));
+
+ // Verify that a variant with only non-copyables can still be constructed.
+ EXPECT_TRUE(absl::holds_alternative<NonCopyable>(
+ variant<NonCopyable>(in_place_index<0>)));
+
+ Var v5(in_place_index<3>, {1, 2, 3});
+ ASSERT_TRUE(absl::holds_alternative<std::vector<int>>(v5));
+ EXPECT_THAT(absl::get<std::vector<int>>(v5), ::testing::ElementsAre(1, 2, 3));
+}
+
+TEST(VariantTest, InPlaceIndexInitializerList) {
+ using Var =
+ variant<int, std::string, NonCopyable, MoveOnlyWithListConstructor>;
+
+ Var v1(in_place_index_t<3>(), {1, 2, 3, 4, 5}, 6);
+ ASSERT_TRUE(absl::holds_alternative<MoveOnlyWithListConstructor>(v1));
+ EXPECT_EQ(6, absl::get<MoveOnlyWithListConstructor>(v1).value);
+}
+
+TEST(VariantTest, InPlaceIndexInitializerListVariableTemplate) {
+ using Var =
+ variant<int, std::string, NonCopyable, MoveOnlyWithListConstructor>;
+
+ Var v1(in_place_index<3>, {1, 2, 3, 4, 5}, 6);
+ ASSERT_TRUE(absl::holds_alternative<MoveOnlyWithListConstructor>(v1));
+ EXPECT_EQ(6, absl::get<MoveOnlyWithListConstructor>(v1).value);
+}
+
+////////////////////
+// [variant.dtor] //
+////////////////////
+
+// Make sure that the destructor destroys the contained value
+TEST(VariantTest, TestDtor) {
+ typedef VariantFactory<IncrementInDtor>::Type Variant;
+ using value_type1 = absl::variant_alternative_t<0, Variant>;
+ using value_type2 = absl::variant_alternative_t<1, Variant>;
+ using value_type3 = absl::variant_alternative_t<2, Variant>;
+ using value_type4 = absl::variant_alternative_t<3, Variant>;
+ int counter = 0;
+ IncrementInDtor counter_adjuster(&counter);
+ EXPECT_EQ(0, counter);
+
+ value_type1 value1(counter_adjuster);
+ { Variant object(value1); }
+ EXPECT_EQ(1, counter);
+
+ value_type2 value2(counter_adjuster);
+ { Variant object(value2); }
+ EXPECT_EQ(2, counter);
+
+ value_type3 value3(counter_adjuster);
+ { Variant object(value3); }
+ EXPECT_EQ(3, counter);
+
+ value_type4 value4(counter_adjuster);
+ { Variant object(value4); }
+ EXPECT_EQ(4, counter);
+}
+
+#ifdef ABSL_HAVE_EXCEPTIONS
+
+// See comment in absl/base/config.h
+#if defined(ABSL_INTERNAL_MSVC_2017_DBG_MODE)
+TEST(VariantTest, DISABLED_TestDtorValuelessByException)
+#else
+// Test destruction when in the valueless_by_exception state.
+TEST(VariantTest, TestDtorValuelessByException)
+#endif
+{
+ int counter = 0;
+ IncrementInDtor counter_adjuster(&counter);
+
+ {
+ using Variant = VariantFactory<IncrementInDtor>::Type;
+
+ Variant v(in_place_index<0>, counter_adjuster);
+ EXPECT_EQ(0, counter);
+
+ ToValuelessByException(v);
+ ASSERT_TRUE(v.valueless_by_exception());
+ EXPECT_EQ(1, counter);
+ }
+ EXPECT_EQ(1, counter);
+}
+
+#endif // ABSL_HAVE_EXCEPTIONS
+
+//////////////////////
+// [variant.assign] //
+//////////////////////
+
+// Test that self-assignment doesn't destroy the current value
+TEST(VariantTest, TestSelfAssignment) {
+ typedef VariantFactory<IncrementInDtor>::Type Variant;
+ int counter = 0;
+ IncrementInDtor counter_adjuster(&counter);
+ absl::variant_alternative_t<0, Variant> value(counter_adjuster);
+ Variant object(value);
+ object.operator=(object);
+ EXPECT_EQ(0, counter);
+
+ // A string long enough that it's likely to defeat any inline representation
+ // optimization.
+ const std::string long_str(128, 'a');
+
+ std::string foo = long_str;
+ foo = *&foo;
+ EXPECT_EQ(long_str, foo);
+
+ variant<int, std::string> so = long_str;
+ ASSERT_EQ(1, so.index());
+ EXPECT_EQ(long_str, absl::get<1>(so));
+ so = *&so;
+
+ ASSERT_EQ(1, so.index());
+ EXPECT_EQ(long_str, absl::get<1>(so));
+}
+
+// Test that assigning a variant<..., T, ...> to a variant<..., T, ...> produces
+// a variant<..., T, ...> with the correct value.
+TYPED_TEST(VariantTypesTest, TestAssignmentCopiesValueSameTypes) {
+ typedef typename VariantFactory<typename TypeParam::value_type>::Type Variant;
+ const TypeParam value(TypeParam::kIndex);
+ const Variant source(value);
+ Variant target(TypeParam(value.value + 1));
+ ASSERT_TRUE(absl::holds_alternative<TypeParam>(source));
+ ASSERT_TRUE(absl::holds_alternative<TypeParam>(target));
+ ASSERT_NE(absl::get<TypeParam>(source), absl::get<TypeParam>(target));
+ target = source;
+ ASSERT_TRUE(absl::holds_alternative<TypeParam>(source));
+ ASSERT_TRUE(absl::holds_alternative<TypeParam>(target));
+ EXPECT_EQ(absl::get<TypeParam>(source), absl::get<TypeParam>(target));
+}
+
+// Test that assisnging a variant<..., T, ...> to a variant<1, ...>
+// produces a variant<..., T, ...> with the correct value.
+TYPED_TEST(VariantTypesTest, TestAssignmentCopiesValuesVaryingSourceType) {
+ typedef typename VariantFactory<typename TypeParam::value_type>::Type Variant;
+ using value_type1 = absl::variant_alternative_t<0, Variant>;
+ const TypeParam value(TypeParam::kIndex);
+ const Variant source(value);
+ ASSERT_TRUE(absl::holds_alternative<TypeParam>(source));
+ Variant target(value_type1(1));
+ ASSERT_TRUE(absl::holds_alternative<value_type1>(target));
+ target = source;
+ EXPECT_TRUE(absl::holds_alternative<TypeParam>(source));
+ EXPECT_TRUE(absl::holds_alternative<TypeParam>(target));
+ EXPECT_EQ(absl::get<TypeParam>(source), absl::get<TypeParam>(target));
+}
+
+// Test that assigning a variant<1, ...> to a variant<..., T, ...>
+// produces a variant<1, ...> with the correct value.
+TYPED_TEST(VariantTypesTest, TestAssignmentCopiesValuesVaryingTargetType) {
+ typedef typename VariantFactory<typename TypeParam::value_type>::Type Variant;
+ using value_type1 = absl::variant_alternative_t<0, Variant>;
+ const Variant source(value_type1(1));
+ ASSERT_TRUE(absl::holds_alternative<value_type1>(source));
+ const TypeParam value(TypeParam::kIndex);
+ Variant target(value);
+ ASSERT_TRUE(absl::holds_alternative<TypeParam>(target));
+ target = source;
+ EXPECT_TRUE(absl::holds_alternative<value_type1>(target));
+ EXPECT_TRUE(absl::holds_alternative<value_type1>(source));
+ EXPECT_EQ(absl::get<value_type1>(source), absl::get<value_type1>(target));
+}
+
+// Test that operator=<T> works, that assigning a new value destroys
+// the old and that assigning the new value again does not redestroy
+// the old
+TEST(VariantTest, TestAssign) {
+ typedef VariantFactory<IncrementInDtor>::Type Variant;
+ using value_type1 = absl::variant_alternative_t<0, Variant>;
+ using value_type2 = absl::variant_alternative_t<1, Variant>;
+ using value_type3 = absl::variant_alternative_t<2, Variant>;
+ using value_type4 = absl::variant_alternative_t<3, Variant>;
+
+ const int kSize = 4;
+ int counter[kSize];
+ std::unique_ptr<IncrementInDtor> counter_adjustor[kSize];
+ for (int i = 0; i != kSize; i++) {
+ counter[i] = 0;
+ counter_adjustor[i] = absl::make_unique<IncrementInDtor>(&counter[i]);
+ }
+
+ value_type1 v1(*counter_adjustor[0]);
+ value_type2 v2(*counter_adjustor[1]);
+ value_type3 v3(*counter_adjustor[2]);
+ value_type4 v4(*counter_adjustor[3]);
+
+ // Test that reassignment causes destruction of old value
+ {
+ Variant object(v1);
+ object = v2;
+ object = v3;
+ object = v4;
+ object = v1;
+ }
+
+ EXPECT_EQ(2, counter[0]);
+ EXPECT_EQ(1, counter[1]);
+ EXPECT_EQ(1, counter[2]);
+ EXPECT_EQ(1, counter[3]);
+
+ std::fill(std::begin(counter), std::end(counter), 0);
+
+ // Test that self-assignment does not cause destruction of old value
+ {
+ Variant object(v1);
+ object.operator=(object);
+ EXPECT_EQ(0, counter[0]);
+ }
+ {
+ Variant object(v2);
+ object.operator=(object);
+ EXPECT_EQ(0, counter[1]);
+ }
+ {
+ Variant object(v3);
+ object.operator=(object);
+ EXPECT_EQ(0, counter[2]);
+ }
+ {
+ Variant object(v4);
+ object.operator=(object);
+ EXPECT_EQ(0, counter[3]);
+ }
+
+ EXPECT_EQ(1, counter[0]);
+ EXPECT_EQ(1, counter[1]);
+ EXPECT_EQ(1, counter[2]);
+ EXPECT_EQ(1, counter[3]);
+}
+
+// This tests that we perform a backup if the copy-assign can throw but the move
+// cannot throw.
+TEST(VariantTest, TestBackupAssign) {
+ typedef VariantFactory<IncrementInDtorCopyCanThrow>::Type Variant;
+ using value_type1 = absl::variant_alternative_t<0, Variant>;
+ using value_type2 = absl::variant_alternative_t<1, Variant>;
+ using value_type3 = absl::variant_alternative_t<2, Variant>;
+ using value_type4 = absl::variant_alternative_t<3, Variant>;
+
+ const int kSize = 4;
+ int counter[kSize];
+ std::unique_ptr<IncrementInDtorCopyCanThrow> counter_adjustor[kSize];
+ for (int i = 0; i != kSize; i++) {
+ counter[i] = 0;
+ counter_adjustor[i].reset(new IncrementInDtorCopyCanThrow(&counter[i]));
+ }
+
+ value_type1 v1(*counter_adjustor[0]);
+ value_type2 v2(*counter_adjustor[1]);
+ value_type3 v3(*counter_adjustor[2]);
+ value_type4 v4(*counter_adjustor[3]);
+
+ // Test that reassignment causes destruction of old value
+ {
+ Variant object(v1);
+ object = v2;
+ object = v3;
+ object = v4;
+ object = v1;
+ }
+
+ // libstdc++ doesn't pass this test
+#if !(defined(ABSL_USES_STD_VARIANT) && defined(__GLIBCXX__))
+ EXPECT_EQ(3, counter[0]);
+ EXPECT_EQ(2, counter[1]);
+ EXPECT_EQ(2, counter[2]);
+ EXPECT_EQ(2, counter[3]);
+#endif
+
+ std::fill(std::begin(counter), std::end(counter), 0);
+
+ // Test that self-assignment does not cause destruction of old value
+ {
+ Variant object(v1);
+ object.operator=(object);
+ EXPECT_EQ(0, counter[0]);
+ }
+ {
+ Variant object(v2);
+ object.operator=(object);
+ EXPECT_EQ(0, counter[1]);
+ }
+ {
+ Variant object(v3);
+ object.operator=(object);
+ EXPECT_EQ(0, counter[2]);
+ }
+ {
+ Variant object(v4);
+ object.operator=(object);
+ EXPECT_EQ(0, counter[3]);
+ }
+
+ EXPECT_EQ(1, counter[0]);
+ EXPECT_EQ(1, counter[1]);
+ EXPECT_EQ(1, counter[2]);
+ EXPECT_EQ(1, counter[3]);
+}
+
+///////////////////
+// [variant.mod] //
+///////////////////
+
+TEST(VariantTest, TestEmplaceBasic) {
+ using Variant = variant<int, char>;
+
+ Variant v(absl::in_place_index<0>, 0);
+
+ {
+ char& emplace_result = v.emplace<char>();
+ ASSERT_TRUE(absl::holds_alternative<char>(v));
+ EXPECT_EQ(absl::get<char>(v), 0);
+ EXPECT_EQ(&emplace_result, &absl::get<char>(v));
+ }
+
+ // Make sure that another emplace does zero-initialization
+ absl::get<char>(v) = 'a';
+ v.emplace<char>('b');
+ ASSERT_TRUE(absl::holds_alternative<char>(v));
+ EXPECT_EQ(absl::get<char>(v), 'b');
+
+ {
+ int& emplace_result = v.emplace<int>();
+ EXPECT_TRUE(absl::holds_alternative<int>(v));
+ EXPECT_EQ(absl::get<int>(v), 0);
+ EXPECT_EQ(&emplace_result, &absl::get<int>(v));
+ }
+}
+
+TEST(VariantTest, TestEmplaceInitializerList) {
+ using Var =
+ variant<int, std::string, NonCopyable, MoveOnlyWithListConstructor>;
+
+ Var v1(absl::in_place_index<0>, 555);
+ MoveOnlyWithListConstructor& emplace_result =
+ v1.emplace<MoveOnlyWithListConstructor>({1, 2, 3, 4, 5}, 6);
+ ASSERT_TRUE(absl::holds_alternative<MoveOnlyWithListConstructor>(v1));
+ EXPECT_EQ(6, absl::get<MoveOnlyWithListConstructor>(v1).value);
+ EXPECT_EQ(&emplace_result, &absl::get<MoveOnlyWithListConstructor>(v1));
+}
+
+TEST(VariantTest, TestEmplaceIndex) {
+ using Variant = variant<int, char>;
+
+ Variant v(absl::in_place_index<0>, 555);
+
+ {
+ char& emplace_result = v.emplace<1>();
+ ASSERT_TRUE(absl::holds_alternative<char>(v));
+ EXPECT_EQ(absl::get<char>(v), 0);
+ EXPECT_EQ(&emplace_result, &absl::get<char>(v));
+ }
+
+ // Make sure that another emplace does zero-initialization
+ absl::get<char>(v) = 'a';
+ v.emplace<1>('b');
+ ASSERT_TRUE(absl::holds_alternative<char>(v));
+ EXPECT_EQ(absl::get<char>(v), 'b');
+
+ {
+ int& emplace_result = v.emplace<0>();
+ EXPECT_TRUE(absl::holds_alternative<int>(v));
+ EXPECT_EQ(absl::get<int>(v), 0);
+ EXPECT_EQ(&emplace_result, &absl::get<int>(v));
+ }
+}
+
+TEST(VariantTest, TestEmplaceIndexInitializerList) {
+ using Var =
+ variant<int, std::string, NonCopyable, MoveOnlyWithListConstructor>;
+
+ Var v1(absl::in_place_index<0>, 555);
+ MoveOnlyWithListConstructor& emplace_result =
+ v1.emplace<3>({1, 2, 3, 4, 5}, 6);
+ ASSERT_TRUE(absl::holds_alternative<MoveOnlyWithListConstructor>(v1));
+ EXPECT_EQ(6, absl::get<MoveOnlyWithListConstructor>(v1).value);
+ EXPECT_EQ(&emplace_result, &absl::get<MoveOnlyWithListConstructor>(v1));
+}
+
+//////////////////////
+// [variant.status] //
+//////////////////////
+
+TEST(VariantTest, Index) {
+ using Var = variant<int, std::string, double>;
+
+ Var v = 1;
+ EXPECT_EQ(0, v.index());
+ v = "str";
+ EXPECT_EQ(1, v.index());
+ v = 0.;
+ EXPECT_EQ(2, v.index());
+
+ Var v2 = v;
+ EXPECT_EQ(2, v2.index());
+ v2.emplace<int>(3);
+ EXPECT_EQ(0, v2.index());
+}
+
+TEST(VariantTest, NotValuelessByException) {
+ using Var = variant<int, std::string, double>;
+
+ Var v = 1;
+ EXPECT_FALSE(v.valueless_by_exception());
+ v = "str";
+ EXPECT_FALSE(v.valueless_by_exception());
+ v = 0.;
+ EXPECT_FALSE(v.valueless_by_exception());
+
+ Var v2 = v;
+ EXPECT_FALSE(v.valueless_by_exception());
+ v2.emplace<int>(3);
+ EXPECT_FALSE(v.valueless_by_exception());
+}
+
+#ifdef ABSL_HAVE_EXCEPTIONS
+
+TEST(VariantTest, IndexValuelessByException) {
+ using Var = variant<MoveCanThrow, std::string, double>;
+
+ Var v(absl::in_place_index<0>);
+ EXPECT_EQ(0, v.index());
+ ToValuelessByException(v);
+ EXPECT_EQ(absl::variant_npos, v.index());
+ v = "str";
+ EXPECT_EQ(1, v.index());
+}
+
+TEST(VariantTest, ValuelessByException) {
+ using Var = variant<MoveCanThrow, std::string, double>;
+
+ Var v(absl::in_place_index<0>);
+ EXPECT_FALSE(v.valueless_by_exception());
+ ToValuelessByException(v);
+ EXPECT_TRUE(v.valueless_by_exception());
+ v = "str";
+ EXPECT_FALSE(v.valueless_by_exception());
+}
+
+#endif // ABSL_HAVE_EXCEPTIONS
+
+////////////////////
+// [variant.swap] //
+////////////////////
+
+TEST(VariantTest, MemberSwap) {
+ SpecialSwap v1(3);
+ SpecialSwap v2(7);
+
+ variant<SpecialSwap> a = v1, b = v2;
+
+ EXPECT_THAT(a, VariantWith<SpecialSwap>(v1));
+ EXPECT_THAT(b, VariantWith<SpecialSwap>(v2));
+
+ a.swap(b);
+ EXPECT_THAT(a, VariantWith<SpecialSwap>(v2));
+ EXPECT_THAT(b, VariantWith<SpecialSwap>(v1));
+ EXPECT_TRUE(absl::get<SpecialSwap>(a).special_swap);
+
+ using V = variant<MoveCanThrow, std::string, int>;
+ int i = 33;
+ std::string s = "abc";
+ {
+ // lhs and rhs holds different alternative
+ V lhs(i), rhs(s);
+ lhs.swap(rhs);
+ EXPECT_THAT(lhs, VariantWith<std::string>(s));
+ EXPECT_THAT(rhs, VariantWith<int>(i));
+ }
+#ifdef ABSL_HAVE_EXCEPTIONS
+ V valueless(in_place_index<0>);
+ ToValuelessByException(valueless);
+ {
+ // lhs is valueless
+ V lhs(valueless), rhs(i);
+ lhs.swap(rhs);
+ EXPECT_THAT(lhs, VariantWith<int>(i));
+ EXPECT_TRUE(rhs.valueless_by_exception());
+ }
+ {
+ // rhs is valueless
+ V lhs(s), rhs(valueless);
+ lhs.swap(rhs);
+ EXPECT_THAT(rhs, VariantWith<std::string>(s));
+ EXPECT_TRUE(lhs.valueless_by_exception());
+ }
+ {
+ // both are valueless
+ V lhs(valueless), rhs(valueless);
+ lhs.swap(rhs);
+ EXPECT_TRUE(lhs.valueless_by_exception());
+ EXPECT_TRUE(rhs.valueless_by_exception());
+ }
+#endif // ABSL_HAVE_EXCEPTIONS
+}
+
+//////////////////////
+// [variant.helper] //
+//////////////////////
+
+TEST(VariantTest, VariantSize) {
+ {
+ using Size1Variant = absl::variant<int>;
+ EXPECT_EQ(1, absl::variant_size<Size1Variant>::value);
+ EXPECT_EQ(1, absl::variant_size<const Size1Variant>::value);
+ EXPECT_EQ(1, absl::variant_size<volatile Size1Variant>::value);
+ EXPECT_EQ(1, absl::variant_size<const volatile Size1Variant>::value);
+ }
+
+ {
+ using Size3Variant = absl::variant<int, float, int>;
+ EXPECT_EQ(3, absl::variant_size<Size3Variant>::value);
+ EXPECT_EQ(3, absl::variant_size<const Size3Variant>::value);
+ EXPECT_EQ(3, absl::variant_size<volatile Size3Variant>::value);
+ EXPECT_EQ(3, absl::variant_size<const volatile Size3Variant>::value);
+ }
+}
+
+TEST(VariantTest, VariantAlternative) {
+ {
+ using V = absl::variant<float, int, const char*>;
+ EXPECT_TRUE(
+ (std::is_same<float, absl::variant_alternative_t<0, V>>::value));
+ EXPECT_TRUE((std::is_same<const float,
+ absl::variant_alternative_t<0, const V>>::value));
+ EXPECT_TRUE(
+ (std::is_same<volatile float,
+ absl::variant_alternative_t<0, volatile V>>::value));
+ EXPECT_TRUE((
+ std::is_same<const volatile float,
+ absl::variant_alternative_t<0, const volatile V>>::value));
+
+ EXPECT_TRUE((std::is_same<int, absl::variant_alternative_t<1, V>>::value));
+ EXPECT_TRUE((std::is_same<const int,
+ absl::variant_alternative_t<1, const V>>::value));
+ EXPECT_TRUE(
+ (std::is_same<volatile int,
+ absl::variant_alternative_t<1, volatile V>>::value));
+ EXPECT_TRUE((
+ std::is_same<const volatile int,
+ absl::variant_alternative_t<1, const volatile V>>::value));
+
+ EXPECT_TRUE(
+ (std::is_same<const char*, absl::variant_alternative_t<2, V>>::value));
+ EXPECT_TRUE((std::is_same<const char* const,
+ absl::variant_alternative_t<2, const V>>::value));
+ EXPECT_TRUE(
+ (std::is_same<const char* volatile,
+ absl::variant_alternative_t<2, volatile V>>::value));
+ EXPECT_TRUE((
+ std::is_same<const char* const volatile,
+ absl::variant_alternative_t<2, const volatile V>>::value));
+ }
+
+ {
+ using V = absl::variant<float, volatile int, const char*>;
+ EXPECT_TRUE(
+ (std::is_same<float, absl::variant_alternative_t<0, V>>::value));
+ EXPECT_TRUE((std::is_same<const float,
+ absl::variant_alternative_t<0, const V>>::value));
+ EXPECT_TRUE(
+ (std::is_same<volatile float,
+ absl::variant_alternative_t<0, volatile V>>::value));
+ EXPECT_TRUE((
+ std::is_same<const volatile float,
+ absl::variant_alternative_t<0, const volatile V>>::value));
+
+ EXPECT_TRUE(
+ (std::is_same<volatile int, absl::variant_alternative_t<1, V>>::value));
+ EXPECT_TRUE((std::is_same<const volatile int,
+ absl::variant_alternative_t<1, const V>>::value));
+ EXPECT_TRUE(
+ (std::is_same<volatile int,
+ absl::variant_alternative_t<1, volatile V>>::value));
+ EXPECT_TRUE((
+ std::is_same<const volatile int,
+ absl::variant_alternative_t<1, const volatile V>>::value));
+
+ EXPECT_TRUE(
+ (std::is_same<const char*, absl::variant_alternative_t<2, V>>::value));
+ EXPECT_TRUE((std::is_same<const char* const,
+ absl::variant_alternative_t<2, const V>>::value));
+ EXPECT_TRUE(
+ (std::is_same<const char* volatile,
+ absl::variant_alternative_t<2, volatile V>>::value));
+ EXPECT_TRUE((
+ std::is_same<const char* const volatile,
+ absl::variant_alternative_t<2, const volatile V>>::value));
+ }
+}
+
+///////////////////
+// [variant.get] //
+///////////////////
+
+TEST(VariantTest, HoldsAlternative) {
+ using Var = variant<int, std::string, double>;
+
+ Var v = 1;
+ EXPECT_TRUE(absl::holds_alternative<int>(v));
+ EXPECT_FALSE(absl::holds_alternative<std::string>(v));
+ EXPECT_FALSE(absl::holds_alternative<double>(v));
+ v = "str";
+ EXPECT_FALSE(absl::holds_alternative<int>(v));
+ EXPECT_TRUE(absl::holds_alternative<std::string>(v));
+ EXPECT_FALSE(absl::holds_alternative<double>(v));
+ v = 0.;
+ EXPECT_FALSE(absl::holds_alternative<int>(v));
+ EXPECT_FALSE(absl::holds_alternative<std::string>(v));
+ EXPECT_TRUE(absl::holds_alternative<double>(v));
+
+ Var v2 = v;
+ EXPECT_FALSE(absl::holds_alternative<int>(v2));
+ EXPECT_FALSE(absl::holds_alternative<std::string>(v2));
+ EXPECT_TRUE(absl::holds_alternative<double>(v2));
+ v2.emplace<int>(3);
+ EXPECT_TRUE(absl::holds_alternative<int>(v2));
+ EXPECT_FALSE(absl::holds_alternative<std::string>(v2));
+ EXPECT_FALSE(absl::holds_alternative<double>(v2));
+}
+
+TEST(VariantTest, GetIndex) {
+ using Var = variant<int, std::string, double, int>;
+
+ {
+ Var v(absl::in_place_index<0>, 0);
+
+ using LValueGetType = decltype(absl::get<0>(v));
+ using RValueGetType = decltype(absl::get<0>(absl::move(v)));
+
+ EXPECT_TRUE((std::is_same<LValueGetType, int&>::value));
+ EXPECT_TRUE((std::is_same<RValueGetType, int&&>::value));
+ EXPECT_EQ(absl::get<0>(v), 0);
+ EXPECT_EQ(absl::get<0>(absl::move(v)), 0);
+
+ const Var& const_v = v;
+ using ConstLValueGetType = decltype(absl::get<0>(const_v));
+ using ConstRValueGetType = decltype(absl::get<0>(absl::move(const_v)));
+ EXPECT_TRUE((std::is_same<ConstLValueGetType, const int&>::value));
+ EXPECT_TRUE((std::is_same<ConstRValueGetType, const int&&>::value));
+ EXPECT_EQ(absl::get<0>(const_v), 0);
+ EXPECT_EQ(absl::get<0>(absl::move(const_v)), 0);
+ }
+
+ {
+ Var v = std::string("Hello");
+
+ using LValueGetType = decltype(absl::get<1>(v));
+ using RValueGetType = decltype(absl::get<1>(absl::move(v)));
+
+ EXPECT_TRUE((std::is_same<LValueGetType, std::string&>::value));
+ EXPECT_TRUE((std::is_same<RValueGetType, std::string&&>::value));
+ EXPECT_EQ(absl::get<1>(v), "Hello");
+ EXPECT_EQ(absl::get<1>(absl::move(v)), "Hello");
+
+ const Var& const_v = v;
+ using ConstLValueGetType = decltype(absl::get<1>(const_v));
+ using ConstRValueGetType = decltype(absl::get<1>(absl::move(const_v)));
+ EXPECT_TRUE((std::is_same<ConstLValueGetType, const std::string&>::value));
+ EXPECT_TRUE((std::is_same<ConstRValueGetType, const std::string&&>::value));
+ EXPECT_EQ(absl::get<1>(const_v), "Hello");
+ EXPECT_EQ(absl::get<1>(absl::move(const_v)), "Hello");
+ }
+
+ {
+ Var v = 2.0;
+
+ using LValueGetType = decltype(absl::get<2>(v));
+ using RValueGetType = decltype(absl::get<2>(absl::move(v)));
+
+ EXPECT_TRUE((std::is_same<LValueGetType, double&>::value));
+ EXPECT_TRUE((std::is_same<RValueGetType, double&&>::value));
+ EXPECT_EQ(absl::get<2>(v), 2.);
+ EXPECT_EQ(absl::get<2>(absl::move(v)), 2.);
+
+ const Var& const_v = v;
+ using ConstLValueGetType = decltype(absl::get<2>(const_v));
+ using ConstRValueGetType = decltype(absl::get<2>(absl::move(const_v)));
+ EXPECT_TRUE((std::is_same<ConstLValueGetType, const double&>::value));
+ EXPECT_TRUE((std::is_same<ConstRValueGetType, const double&&>::value));
+ EXPECT_EQ(absl::get<2>(const_v), 2.);
+ EXPECT_EQ(absl::get<2>(absl::move(const_v)), 2.);
+ }
+
+ {
+ Var v(absl::in_place_index<0>, 0);
+ v.emplace<3>(1);
+
+ using LValueGetType = decltype(absl::get<3>(v));
+ using RValueGetType = decltype(absl::get<3>(absl::move(v)));
+
+ EXPECT_TRUE((std::is_same<LValueGetType, int&>::value));
+ EXPECT_TRUE((std::is_same<RValueGetType, int&&>::value));
+ EXPECT_EQ(absl::get<3>(v), 1);
+ EXPECT_EQ(absl::get<3>(absl::move(v)), 1);
+
+ const Var& const_v = v;
+ using ConstLValueGetType = decltype(absl::get<3>(const_v));
+ using ConstRValueGetType = decltype(absl::get<3>(absl::move(const_v)));
+ EXPECT_TRUE((std::is_same<ConstLValueGetType, const int&>::value));
+ EXPECT_TRUE((std::is_same<ConstRValueGetType, const int&&>::value));
+ EXPECT_EQ(absl::get<3>(const_v), 1);
+ EXPECT_EQ(absl::get<3>(absl::move(const_v)), 1); // NOLINT
+ }
+}
+
+TEST(VariantTest, BadGetIndex) {
+ using Var = variant<int, std::string, double>;
+
+ {
+ Var v = 1;
+
+ ABSL_VARIANT_TEST_EXPECT_BAD_VARIANT_ACCESS(absl::get<1>(v));
+ ABSL_VARIANT_TEST_EXPECT_BAD_VARIANT_ACCESS(absl::get<1>(std::move(v)));
+
+ const Var& const_v = v;
+ ABSL_VARIANT_TEST_EXPECT_BAD_VARIANT_ACCESS(absl::get<1>(const_v));
+ ABSL_VARIANT_TEST_EXPECT_BAD_VARIANT_ACCESS(
+ absl::get<1>(std::move(const_v))); // NOLINT
+ }
+
+ {
+ Var v = std::string("Hello");
+
+ ABSL_VARIANT_TEST_EXPECT_BAD_VARIANT_ACCESS(absl::get<0>(v));
+ ABSL_VARIANT_TEST_EXPECT_BAD_VARIANT_ACCESS(absl::get<0>(std::move(v)));
+
+ const Var& const_v = v;
+ ABSL_VARIANT_TEST_EXPECT_BAD_VARIANT_ACCESS(absl::get<0>(const_v));
+ ABSL_VARIANT_TEST_EXPECT_BAD_VARIANT_ACCESS(
+ absl::get<0>(std::move(const_v))); // NOLINT
+ }
+}
+
+TEST(VariantTest, GetType) {
+ using Var = variant<int, std::string, double>;
+
+ {
+ Var v = 1;
+
+ using LValueGetType = decltype(absl::get<int>(v));
+ using RValueGetType = decltype(absl::get<int>(absl::move(v)));
+
+ EXPECT_TRUE((std::is_same<LValueGetType, int&>::value));
+ EXPECT_TRUE((std::is_same<RValueGetType, int&&>::value));
+ EXPECT_EQ(absl::get<int>(v), 1);
+ EXPECT_EQ(absl::get<int>(absl::move(v)), 1);
+
+ const Var& const_v = v;
+ using ConstLValueGetType = decltype(absl::get<int>(const_v));
+ using ConstRValueGetType = decltype(absl::get<int>(absl::move(const_v)));
+ EXPECT_TRUE((std::is_same<ConstLValueGetType, const int&>::value));
+ EXPECT_TRUE((std::is_same<ConstRValueGetType, const int&&>::value));
+ EXPECT_EQ(absl::get<int>(const_v), 1);
+ EXPECT_EQ(absl::get<int>(absl::move(const_v)), 1);
+ }
+
+ {
+ Var v = std::string("Hello");
+
+ using LValueGetType = decltype(absl::get<1>(v));
+ using RValueGetType = decltype(absl::get<1>(absl::move(v)));
+
+ EXPECT_TRUE((std::is_same<LValueGetType, std::string&>::value));
+ EXPECT_TRUE((std::is_same<RValueGetType, std::string&&>::value));
+ EXPECT_EQ(absl::get<std::string>(v), "Hello");
+ EXPECT_EQ(absl::get<std::string>(absl::move(v)), "Hello");
+
+ const Var& const_v = v;
+ using ConstLValueGetType = decltype(absl::get<1>(const_v));
+ using ConstRValueGetType = decltype(absl::get<1>(absl::move(const_v)));
+ EXPECT_TRUE((std::is_same<ConstLValueGetType, const std::string&>::value));
+ EXPECT_TRUE((std::is_same<ConstRValueGetType, const std::string&&>::value));
+ EXPECT_EQ(absl::get<std::string>(const_v), "Hello");
+ EXPECT_EQ(absl::get<std::string>(absl::move(const_v)), "Hello");
+ }
+
+ {
+ Var v = 2.0;
+
+ using LValueGetType = decltype(absl::get<2>(v));
+ using RValueGetType = decltype(absl::get<2>(absl::move(v)));
+
+ EXPECT_TRUE((std::is_same<LValueGetType, double&>::value));
+ EXPECT_TRUE((std::is_same<RValueGetType, double&&>::value));
+ EXPECT_EQ(absl::get<double>(v), 2.);
+ EXPECT_EQ(absl::get<double>(absl::move(v)), 2.);
+
+ const Var& const_v = v;
+ using ConstLValueGetType = decltype(absl::get<2>(const_v));
+ using ConstRValueGetType = decltype(absl::get<2>(absl::move(const_v)));
+ EXPECT_TRUE((std::is_same<ConstLValueGetType, const double&>::value));
+ EXPECT_TRUE((std::is_same<ConstRValueGetType, const double&&>::value));
+ EXPECT_EQ(absl::get<double>(const_v), 2.);
+ EXPECT_EQ(absl::get<double>(absl::move(const_v)), 2.);
+ }
+}
+
+TEST(VariantTest, BadGetType) {
+ using Var = variant<int, std::string, double>;
+
+ {
+ Var v = 1;
+
+ ABSL_VARIANT_TEST_EXPECT_BAD_VARIANT_ACCESS(absl::get<std::string>(v));
+ ABSL_VARIANT_TEST_EXPECT_BAD_VARIANT_ACCESS(
+ absl::get<std::string>(std::move(v)));
+
+ const Var& const_v = v;
+ ABSL_VARIANT_TEST_EXPECT_BAD_VARIANT_ACCESS(
+ absl::get<std::string>(const_v));
+ ABSL_VARIANT_TEST_EXPECT_BAD_VARIANT_ACCESS(
+ absl::get<std::string>(std::move(const_v))); // NOLINT
+ }
+
+ {
+ Var v = std::string("Hello");
+
+ ABSL_VARIANT_TEST_EXPECT_BAD_VARIANT_ACCESS(absl::get<int>(v));
+ ABSL_VARIANT_TEST_EXPECT_BAD_VARIANT_ACCESS(absl::get<int>(std::move(v)));
+
+ const Var& const_v = v;
+ ABSL_VARIANT_TEST_EXPECT_BAD_VARIANT_ACCESS(absl::get<int>(const_v));
+ ABSL_VARIANT_TEST_EXPECT_BAD_VARIANT_ACCESS(
+ absl::get<int>(std::move(const_v))); // NOLINT
+ }
+}
+
+TEST(VariantTest, GetIfIndex) {
+ using Var = variant<int, std::string, double, int>;
+
+ {
+ Var v(absl::in_place_index<0>, 0);
+ EXPECT_TRUE(noexcept(absl::get_if<0>(&v)));
+
+ {
+ auto* elem = absl::get_if<0>(&v);
+ EXPECT_TRUE((std::is_same<decltype(elem), int*>::value));
+ ASSERT_NE(elem, nullptr);
+ EXPECT_EQ(*elem, 0);
+ {
+ auto* bad_elem = absl::get_if<1>(&v);
+ EXPECT_TRUE((std::is_same<decltype(bad_elem), std::string*>::value));
+ EXPECT_EQ(bad_elem, nullptr);
+ }
+ {
+ auto* bad_elem = absl::get_if<2>(&v);
+ EXPECT_TRUE((std::is_same<decltype(bad_elem), double*>::value));
+ EXPECT_EQ(bad_elem, nullptr);
+ }
+ {
+ auto* bad_elem = absl::get_if<3>(&v);
+ EXPECT_TRUE((std::is_same<decltype(bad_elem), int*>::value));
+ EXPECT_EQ(bad_elem, nullptr);
+ }
+ }
+
+ const Var& const_v = v;
+ EXPECT_TRUE(noexcept(absl::get_if<0>(&const_v)));
+
+ {
+ auto* elem = absl::get_if<0>(&const_v);
+ EXPECT_TRUE((std::is_same<decltype(elem), const int*>::value));
+ ASSERT_NE(elem, nullptr);
+ EXPECT_EQ(*elem, 0);
+ {
+ auto* bad_elem = absl::get_if<1>(&const_v);
+ EXPECT_TRUE(
+ (std::is_same<decltype(bad_elem), const std::string*>::value));
+ EXPECT_EQ(bad_elem, nullptr);
+ }
+ {
+ auto* bad_elem = absl::get_if<2>(&const_v);
+ EXPECT_TRUE((std::is_same<decltype(bad_elem), const double*>::value));
+ EXPECT_EQ(bad_elem, nullptr);
+ }
+ {
+ auto* bad_elem = absl::get_if<3>(&const_v);
+ EXPECT_EQ(bad_elem, nullptr);
+ EXPECT_TRUE((std::is_same<decltype(bad_elem), const int*>::value));
+ }
+ }
+ }
+
+ {
+ Var v = std::string("Hello");
+ EXPECT_TRUE(noexcept(absl::get_if<1>(&v)));
+
+ {
+ auto* elem = absl::get_if<1>(&v);
+ EXPECT_TRUE((std::is_same<decltype(elem), std::string*>::value));
+ ASSERT_NE(elem, nullptr);
+ EXPECT_EQ(*elem, "Hello");
+ {
+ auto* bad_elem = absl::get_if<0>(&v);
+ EXPECT_TRUE((std::is_same<decltype(bad_elem), int*>::value));
+ EXPECT_EQ(bad_elem, nullptr);
+ }
+ {
+ auto* bad_elem = absl::get_if<2>(&v);
+ EXPECT_TRUE((std::is_same<decltype(bad_elem), double*>::value));
+ EXPECT_EQ(bad_elem, nullptr);
+ }
+ {
+ auto* bad_elem = absl::get_if<3>(&v);
+ EXPECT_TRUE((std::is_same<decltype(bad_elem), int*>::value));
+ EXPECT_EQ(bad_elem, nullptr);
+ }
+ }
+
+ const Var& const_v = v;
+ EXPECT_TRUE(noexcept(absl::get_if<1>(&const_v)));
+
+ {
+ auto* elem = absl::get_if<1>(&const_v);
+ EXPECT_TRUE((std::is_same<decltype(elem), const std::string*>::value));
+ ASSERT_NE(elem, nullptr);
+ EXPECT_EQ(*elem, "Hello");
+ {
+ auto* bad_elem = absl::get_if<0>(&const_v);
+ EXPECT_TRUE((std::is_same<decltype(bad_elem), const int*>::value));
+ EXPECT_EQ(bad_elem, nullptr);
+ }
+ {
+ auto* bad_elem = absl::get_if<2>(&const_v);
+ EXPECT_TRUE((std::is_same<decltype(bad_elem), const double*>::value));
+ EXPECT_EQ(bad_elem, nullptr);
+ }
+ {
+ auto* bad_elem = absl::get_if<3>(&const_v);
+ EXPECT_EQ(bad_elem, nullptr);
+ EXPECT_TRUE((std::is_same<decltype(bad_elem), const int*>::value));
+ }
+ }
+ }
+
+ {
+ Var v = 2.0;
+ EXPECT_TRUE(noexcept(absl::get_if<2>(&v)));
+
+ {
+ auto* elem = absl::get_if<2>(&v);
+ EXPECT_TRUE((std::is_same<decltype(elem), double*>::value));
+ ASSERT_NE(elem, nullptr);
+ EXPECT_EQ(*elem, 2.0);
+ {
+ auto* bad_elem = absl::get_if<0>(&v);
+ EXPECT_TRUE((std::is_same<decltype(bad_elem), int*>::value));
+ EXPECT_EQ(bad_elem, nullptr);
+ }
+ {
+ auto* bad_elem = absl::get_if<1>(&v);
+ EXPECT_TRUE((std::is_same<decltype(bad_elem), std::string*>::value));
+ EXPECT_EQ(bad_elem, nullptr);
+ }
+ {
+ auto* bad_elem = absl::get_if<3>(&v);
+ EXPECT_TRUE((std::is_same<decltype(bad_elem), int*>::value));
+ EXPECT_EQ(bad_elem, nullptr);
+ }
+ }
+
+ const Var& const_v = v;
+ EXPECT_TRUE(noexcept(absl::get_if<2>(&const_v)));
+
+ {
+ auto* elem = absl::get_if<2>(&const_v);
+ EXPECT_TRUE((std::is_same<decltype(elem), const double*>::value));
+ ASSERT_NE(elem, nullptr);
+ EXPECT_EQ(*elem, 2.0);
+ {
+ auto* bad_elem = absl::get_if<0>(&const_v);
+ EXPECT_TRUE((std::is_same<decltype(bad_elem), const int*>::value));
+ EXPECT_EQ(bad_elem, nullptr);
+ }
+ {
+ auto* bad_elem = absl::get_if<1>(&const_v);
+ EXPECT_TRUE(
+ (std::is_same<decltype(bad_elem), const std::string*>::value));
+ EXPECT_EQ(bad_elem, nullptr);
+ }
+ {
+ auto* bad_elem = absl::get_if<3>(&const_v);
+ EXPECT_EQ(bad_elem, nullptr);
+ EXPECT_TRUE((std::is_same<decltype(bad_elem), const int*>::value));
+ }
+ }
+ }
+
+ {
+ Var v(absl::in_place_index<0>, 0);
+ v.emplace<3>(1);
+ EXPECT_TRUE(noexcept(absl::get_if<3>(&v)));
+
+ {
+ auto* elem = absl::get_if<3>(&v);
+ EXPECT_TRUE((std::is_same<decltype(elem), int*>::value));
+ ASSERT_NE(elem, nullptr);
+ EXPECT_EQ(*elem, 1);
+ {
+ auto* bad_elem = absl::get_if<0>(&v);
+ EXPECT_TRUE((std::is_same<decltype(bad_elem), int*>::value));
+ EXPECT_EQ(bad_elem, nullptr);
+ }
+ {
+ auto* bad_elem = absl::get_if<1>(&v);
+ EXPECT_TRUE((std::is_same<decltype(bad_elem), std::string*>::value));
+ EXPECT_EQ(bad_elem, nullptr);
+ }
+ {
+ auto* bad_elem = absl::get_if<2>(&v);
+ EXPECT_TRUE((std::is_same<decltype(bad_elem), double*>::value));
+ EXPECT_EQ(bad_elem, nullptr);
+ }
+ }
+
+ const Var& const_v = v;
+ EXPECT_TRUE(noexcept(absl::get_if<3>(&const_v)));
+
+ {
+ auto* elem = absl::get_if<3>(&const_v);
+ EXPECT_TRUE((std::is_same<decltype(elem), const int*>::value));
+ ASSERT_NE(elem, nullptr);
+ EXPECT_EQ(*elem, 1);
+ {
+ auto* bad_elem = absl::get_if<0>(&const_v);
+ EXPECT_TRUE((std::is_same<decltype(bad_elem), const int*>::value));
+ EXPECT_EQ(bad_elem, nullptr);
+ }
+ {
+ auto* bad_elem = absl::get_if<1>(&const_v);
+ EXPECT_TRUE(
+ (std::is_same<decltype(bad_elem), const std::string*>::value));
+ EXPECT_EQ(bad_elem, nullptr);
+ }
+ {
+ auto* bad_elem = absl::get_if<2>(&const_v);
+ EXPECT_EQ(bad_elem, nullptr);
+ EXPECT_TRUE((std::is_same<decltype(bad_elem), const double*>::value));
+ }
+ }
+ }
+}
+
+//////////////////////
+// [variant.relops] //
+//////////////////////
+
+TEST(VariantTest, OperatorEquals) {
+ variant<int, std::string> a(1), b(1);
+ EXPECT_TRUE(a == b);
+ EXPECT_TRUE(b == a);
+ EXPECT_FALSE(a != b);
+ EXPECT_FALSE(b != a);
+
+ b = "str";
+ EXPECT_FALSE(a == b);
+ EXPECT_FALSE(b == a);
+ EXPECT_TRUE(a != b);
+ EXPECT_TRUE(b != a);
+
+ b = 0;
+ EXPECT_FALSE(a == b);
+ EXPECT_FALSE(b == a);
+ EXPECT_TRUE(a != b);
+ EXPECT_TRUE(b != a);
+
+ a = b = "foo";
+ EXPECT_TRUE(a == b);
+ EXPECT_TRUE(b == a);
+ EXPECT_FALSE(a != b);
+ EXPECT_FALSE(b != a);
+
+ a = "bar";
+ EXPECT_FALSE(a == b);
+ EXPECT_FALSE(b == a);
+ EXPECT_TRUE(a != b);
+ EXPECT_TRUE(b != a);
+}
+
+TEST(VariantTest, OperatorRelational) {
+ variant<int, std::string> a(1), b(1);
+ EXPECT_FALSE(a < b);
+ EXPECT_FALSE(b < a);
+ EXPECT_FALSE(a > b);
+ EXPECT_FALSE(b > a);
+ EXPECT_TRUE(a <= b);
+ EXPECT_TRUE(b <= a);
+ EXPECT_TRUE(a >= b);
+ EXPECT_TRUE(b >= a);
+
+ b = "str";
+ EXPECT_TRUE(a < b);
+ EXPECT_FALSE(b < a);
+ EXPECT_FALSE(a > b);
+ EXPECT_TRUE(b > a);
+ EXPECT_TRUE(a <= b);
+ EXPECT_FALSE(b <= a);
+ EXPECT_FALSE(a >= b);
+ EXPECT_TRUE(b >= a);
+
+ b = 0;
+ EXPECT_FALSE(a < b);
+ EXPECT_TRUE(b < a);
+ EXPECT_TRUE(a > b);
+ EXPECT_FALSE(b > a);
+ EXPECT_FALSE(a <= b);
+ EXPECT_TRUE(b <= a);
+ EXPECT_TRUE(a >= b);
+ EXPECT_FALSE(b >= a);
+
+ a = b = "foo";
+ EXPECT_FALSE(a < b);
+ EXPECT_FALSE(b < a);
+ EXPECT_FALSE(a > b);
+ EXPECT_FALSE(b > a);
+ EXPECT_TRUE(a <= b);
+ EXPECT_TRUE(b <= a);
+ EXPECT_TRUE(a >= b);
+ EXPECT_TRUE(b >= a);
+
+ a = "bar";
+ EXPECT_TRUE(a < b);
+ EXPECT_FALSE(b < a);
+ EXPECT_FALSE(a > b);
+ EXPECT_TRUE(b > a);
+ EXPECT_TRUE(a <= b);
+ EXPECT_FALSE(b <= a);
+ EXPECT_FALSE(a >= b);
+ EXPECT_TRUE(b >= a);
+}
+
+#ifdef ABSL_HAVE_EXCEPTIONS
+
+TEST(VariantTest, ValuelessOperatorEquals) {
+ variant<MoveCanThrow, std::string> int_v(1), string_v("Hello"),
+ valueless(absl::in_place_index<0>),
+ other_valueless(absl::in_place_index<0>);
+ ToValuelessByException(valueless);
+ ToValuelessByException(other_valueless);
+
+ EXPECT_TRUE(valueless == other_valueless);
+ EXPECT_TRUE(other_valueless == valueless);
+ EXPECT_FALSE(valueless == int_v);
+ EXPECT_FALSE(valueless == string_v);
+ EXPECT_FALSE(int_v == valueless);
+ EXPECT_FALSE(string_v == valueless);
+
+ EXPECT_FALSE(valueless != other_valueless);
+ EXPECT_FALSE(other_valueless != valueless);
+ EXPECT_TRUE(valueless != int_v);
+ EXPECT_TRUE(valueless != string_v);
+ EXPECT_TRUE(int_v != valueless);
+ EXPECT_TRUE(string_v != valueless);
+}
+
+TEST(VariantTest, ValuelessOperatorRelational) {
+ variant<MoveCanThrow, std::string> int_v(1), string_v("Hello"),
+ valueless(absl::in_place_index<0>),
+ other_valueless(absl::in_place_index<0>);
+ ToValuelessByException(valueless);
+ ToValuelessByException(other_valueless);
+
+ EXPECT_FALSE(valueless < other_valueless);
+ EXPECT_FALSE(other_valueless < valueless);
+ EXPECT_TRUE(valueless < int_v);
+ EXPECT_TRUE(valueless < string_v);
+ EXPECT_FALSE(int_v < valueless);
+ EXPECT_FALSE(string_v < valueless);
+
+ EXPECT_TRUE(valueless <= other_valueless);
+ EXPECT_TRUE(other_valueless <= valueless);
+ EXPECT_TRUE(valueless <= int_v);
+ EXPECT_TRUE(valueless <= string_v);
+ EXPECT_FALSE(int_v <= valueless);
+ EXPECT_FALSE(string_v <= valueless);
+
+ EXPECT_TRUE(valueless >= other_valueless);
+ EXPECT_TRUE(other_valueless >= valueless);
+ EXPECT_FALSE(valueless >= int_v);
+ EXPECT_FALSE(valueless >= string_v);
+ EXPECT_TRUE(int_v >= valueless);
+ EXPECT_TRUE(string_v >= valueless);
+
+ EXPECT_FALSE(valueless > other_valueless);
+ EXPECT_FALSE(other_valueless > valueless);
+ EXPECT_FALSE(valueless > int_v);
+ EXPECT_FALSE(valueless > string_v);
+ EXPECT_TRUE(int_v > valueless);
+ EXPECT_TRUE(string_v > valueless);
+}
+
+#endif
+
+/////////////////////
+// [variant.visit] //
+/////////////////////
+
+template <typename T>
+struct ConvertTo {
+ template <typename U>
+ T operator()(const U& u) const {
+ return u;
+ }
+};
+
+TEST(VariantTest, VisitSimple) {
+ variant<std::string, const char*> v = "A";
+
+ std::string str = absl::visit(ConvertTo<std::string>{}, v);
+ EXPECT_EQ("A", str);
+
+ v = std::string("B");
+
+ absl::string_view piece = absl::visit(ConvertTo<absl::string_view>{}, v);
+ EXPECT_EQ("B", piece);
+
+ struct StrLen {
+ int operator()(const char* s) const { return strlen(s); }
+ int operator()(const std::string& s) const { return s.size(); }
+ };
+
+ v = "SomeStr";
+ EXPECT_EQ(7, absl::visit(StrLen{}, v));
+ v = std::string("VeryLargeThisTime");
+ EXPECT_EQ(17, absl::visit(StrLen{}, v));
+}
+
+TEST(VariantTest, VisitRValue) {
+ variant<std::string> v = std::string("X");
+ struct Visitor {
+ bool operator()(const std::string&) const { return false; }
+ bool operator()(std::string&&) const { return true; } // NOLINT
+
+ int operator()(const std::string&, const std::string&) const { return 0; }
+ int operator()(const std::string&, std::string&&) const {
+ return 1;
+ } // NOLINT
+ int operator()(std::string&&, const std::string&) const {
+ return 2;
+ } // NOLINT
+ int operator()(std::string&&, std::string&&) const { return 3; } // NOLINT
+ };
+ EXPECT_FALSE(absl::visit(Visitor{}, v));
+ EXPECT_TRUE(absl::visit(Visitor{}, absl::move(v)));
+
+ // Also test the variadic overload.
+ EXPECT_EQ(0, absl::visit(Visitor{}, v, v));
+ EXPECT_EQ(1, absl::visit(Visitor{}, v, absl::move(v)));
+ EXPECT_EQ(2, absl::visit(Visitor{}, absl::move(v), v));
+ EXPECT_EQ(3, absl::visit(Visitor{}, absl::move(v), absl::move(v)));
+}
+
+TEST(VariantTest, VisitRValueVisitor) {
+ variant<std::string> v = std::string("X");
+ struct Visitor {
+ bool operator()(const std::string&) const& { return false; }
+ bool operator()(const std::string&) && { return true; }
+ };
+ Visitor visitor;
+ EXPECT_FALSE(absl::visit(visitor, v));
+ EXPECT_TRUE(absl::visit(Visitor{}, v));
+}
+
+TEST(VariantTest, VisitResultTypeDifferent) {
+ variant<std::string> v = std::string("X");
+ struct LValue_LValue {};
+ struct RValue_LValue {};
+ struct LValue_RValue {};
+ struct RValue_RValue {};
+ struct Visitor {
+ LValue_LValue operator()(const std::string&) const& { return {}; }
+ RValue_LValue operator()(std::string&&) const& { return {}; } // NOLINT
+ LValue_RValue operator()(const std::string&) && { return {}; }
+ RValue_RValue operator()(std::string&&) && { return {}; } // NOLINT
+ } visitor;
+
+ EXPECT_TRUE(
+ (std::is_same<LValue_LValue, decltype(absl::visit(visitor, v))>::value));
+ EXPECT_TRUE(
+ (std::is_same<RValue_LValue,
+ decltype(absl::visit(visitor, absl::move(v)))>::value));
+ EXPECT_TRUE((
+ std::is_same<LValue_RValue, decltype(absl::visit(Visitor{}, v))>::value));
+ EXPECT_TRUE(
+ (std::is_same<RValue_RValue,
+ decltype(absl::visit(Visitor{}, absl::move(v)))>::value));
+}
+
+TEST(VariantTest, VisitVariadic) {
+ using A = variant<int, std::string>;
+ using B = variant<std::unique_ptr<int>, absl::string_view>;
+
+ struct Visitor {
+ std::pair<int, int> operator()(int a, std::unique_ptr<int> b) const {
+ return {a, *b};
+ }
+ std::pair<int, int> operator()(absl::string_view a,
+ std::unique_ptr<int> b) const {
+ return {static_cast<int>(a.size()), static_cast<int>(*b)};
+ }
+ std::pair<int, int> operator()(int a, absl::string_view b) const {
+ return {a, static_cast<int>(b.size())};
+ }
+ std::pair<int, int> operator()(absl::string_view a,
+ absl::string_view b) const {
+ return {static_cast<int>(a.size()), static_cast<int>(b.size())};
+ }
+ };
+
+ EXPECT_THAT(absl::visit(Visitor(), A(1), B(std::unique_ptr<int>(new int(7)))),
+ ::testing::Pair(1, 7));
+ EXPECT_THAT(absl::visit(Visitor(), A(1), B(absl::string_view("ABC"))),
+ ::testing::Pair(1, 3));
+ EXPECT_THAT(absl::visit(Visitor(), A(std::string("BBBBB")),
+ B(std::unique_ptr<int>(new int(7)))),
+ ::testing::Pair(5, 7));
+ EXPECT_THAT(absl::visit(Visitor(), A(std::string("BBBBB")),
+ B(absl::string_view("ABC"))),
+ ::testing::Pair(5, 3));
+}
+
+TEST(VariantTest, VisitNoArgs) {
+ EXPECT_EQ(5, absl::visit([] { return 5; }));
+}
+
+struct ConstFunctor {
+ int operator()(int a, int b) const { return a - b; }
+};
+
+struct MutableFunctor {
+ int operator()(int a, int b) { return a - b; }
+};
+
+struct Class {
+ int Method(int a, int b) { return a - b; }
+ int ConstMethod(int a, int b) const { return a - b; }
+
+ int member;
+};
+
+TEST(VariantTest, VisitReferenceWrapper) {
+ ConstFunctor cf;
+ MutableFunctor mf;
+ absl::variant<int> three = 3;
+ absl::variant<int> two = 2;
+
+ EXPECT_EQ(1, absl::visit(std::cref(cf), three, two));
+ EXPECT_EQ(1, absl::visit(std::ref(cf), three, two));
+ EXPECT_EQ(1, absl::visit(std::ref(mf), three, two));
+}
+
+// libstdc++ std::variant doesn't support the INVOKE semantics.
+#if !(defined(ABSL_USES_STD_VARIANT) && defined(__GLIBCXX__))
+TEST(VariantTest, VisitMemberFunction) {
+ absl::variant<std::unique_ptr<Class>> p(absl::make_unique<Class>());
+ absl::variant<std::unique_ptr<const Class>> cp(
+ absl::make_unique<const Class>());
+ absl::variant<int> three = 3;
+ absl::variant<int> two = 2;
+
+ EXPECT_EQ(1, absl::visit(&Class::Method, p, three, two));
+ EXPECT_EQ(1, absl::visit(&Class::ConstMethod, p, three, two));
+ EXPECT_EQ(1, absl::visit(&Class::ConstMethod, cp, three, two));
+}
+
+TEST(VariantTest, VisitDataMember) {
+ absl::variant<std::unique_ptr<Class>> p(absl::make_unique<Class>(Class{42}));
+ absl::variant<std::unique_ptr<const Class>> cp(
+ absl::make_unique<const Class>(Class{42}));
+ EXPECT_EQ(42, absl::visit(&Class::member, p));
+
+ absl::visit(&Class::member, p) = 5;
+ EXPECT_EQ(5, absl::visit(&Class::member, p));
+
+ EXPECT_EQ(42, absl::visit(&Class::member, cp));
+}
+#endif // !(defined(ABSL_USES_STD_VARIANT) && defined(__GLIBCXX__))
+
+/////////////////////////
+// [variant.monostate] //
+/////////////////////////
+
+TEST(VariantTest, MonostateBasic) {
+ absl::monostate mono;
+ (void)mono;
+
+ // TODO(mattcalabrese) Expose move triviality metafunctions in absl.
+ EXPECT_TRUE(absl::is_trivially_default_constructible<absl::monostate>::value);
+ EXPECT_TRUE(is_trivially_move_constructible<absl::monostate>::value);
+ EXPECT_TRUE(absl::is_trivially_copy_constructible<absl::monostate>::value);
+ EXPECT_TRUE(is_trivially_move_assignable<absl::monostate>::value);
+ EXPECT_TRUE(absl::is_trivially_copy_assignable<absl::monostate>::value);
+ EXPECT_TRUE(absl::is_trivially_destructible<absl::monostate>::value);
+}
+
+TEST(VariantTest, VariantMonostateDefaultConstruction) {
+ absl::variant<absl::monostate, NonDefaultConstructible> var;
+ EXPECT_EQ(var.index(), 0);
+}
+
+////////////////////////////////
+// [variant.monostate.relops] //
+////////////////////////////////
+
+TEST(VariantTest, MonostateComparisons) {
+ absl::monostate lhs, rhs;
+
+ EXPECT_EQ(lhs, lhs);
+ EXPECT_EQ(lhs, rhs);
+
+ EXPECT_FALSE(lhs != lhs);
+ EXPECT_FALSE(lhs != rhs);
+ EXPECT_FALSE(lhs < lhs);
+ EXPECT_FALSE(lhs < rhs);
+ EXPECT_FALSE(lhs > lhs);
+ EXPECT_FALSE(lhs > rhs);
+
+ EXPECT_LE(lhs, lhs);
+ EXPECT_LE(lhs, rhs);
+ EXPECT_GE(lhs, lhs);
+ EXPECT_GE(lhs, rhs);
+
+ EXPECT_TRUE(noexcept(std::declval<absl::monostate>() ==
+ std::declval<absl::monostate>()));
+ EXPECT_TRUE(noexcept(std::declval<absl::monostate>() !=
+ std::declval<absl::monostate>()));
+ EXPECT_TRUE(noexcept(std::declval<absl::monostate>() <
+ std::declval<absl::monostate>()));
+ EXPECT_TRUE(noexcept(std::declval<absl::monostate>() >
+ std::declval<absl::monostate>()));
+ EXPECT_TRUE(noexcept(std::declval<absl::monostate>() <=
+ std::declval<absl::monostate>()));
+ EXPECT_TRUE(noexcept(std::declval<absl::monostate>() >=
+ std::declval<absl::monostate>()));
+}
+
+///////////////////////
+// [variant.specalg] //
+///////////////////////
+
+TEST(VariantTest, NonmemberSwap) {
+ using std::swap;
+
+ SpecialSwap v1(3);
+ SpecialSwap v2(7);
+
+ variant<SpecialSwap> a = v1, b = v2;
+
+ EXPECT_THAT(a, VariantWith<SpecialSwap>(v1));
+ EXPECT_THAT(b, VariantWith<SpecialSwap>(v2));
+
+ std::swap(a, b);
+ EXPECT_THAT(a, VariantWith<SpecialSwap>(v2));
+ EXPECT_THAT(b, VariantWith<SpecialSwap>(v1));
+#ifndef ABSL_USES_STD_VARIANT
+ EXPECT_FALSE(absl::get<SpecialSwap>(a).special_swap);
+#endif
+
+ swap(a, b);
+ EXPECT_THAT(a, VariantWith<SpecialSwap>(v1));
+ EXPECT_THAT(b, VariantWith<SpecialSwap>(v2));
+ EXPECT_TRUE(absl::get<SpecialSwap>(b).special_swap);
+}
+
+//////////////////////////
+// [variant.bad.access] //
+//////////////////////////
+
+TEST(VariantTest, BadAccess) {
+ EXPECT_TRUE(noexcept(absl::bad_variant_access()));
+ absl::bad_variant_access exception_obj;
+ std::exception* base = &exception_obj;
+ (void)base;
+}
+
+////////////////////
+// [variant.hash] //
+////////////////////
+
+TEST(VariantTest, MonostateHash) {
+ absl::monostate mono, other_mono;
+ std::hash<absl::monostate> const hasher{};
+ static_assert(std::is_same<decltype(hasher(mono)), std::size_t>::value, "");
+ EXPECT_EQ(hasher(mono), hasher(other_mono));
+}
+
+TEST(VariantTest, Hash) {
+ static_assert(type_traits_internal::IsHashable<variant<int>>::value, "");
+ static_assert(type_traits_internal::IsHashable<variant<Hashable>>::value, "");
+ static_assert(type_traits_internal::IsHashable<variant<int, Hashable>>::value,
+ "");
+
+#if ABSL_META_INTERNAL_STD_HASH_SFINAE_FRIENDLY_
+ static_assert(!type_traits_internal::IsHashable<variant<NonHashable>>::value,
+ "");
+ static_assert(
+ !type_traits_internal::IsHashable<variant<Hashable, NonHashable>>::value,
+ "");
+#endif
+
+// MSVC std::hash<std::variant> does not use the index, thus produce the same
+// result on the same value as different alternative.
+#if !(defined(_MSC_VER) && defined(ABSL_USES_STD_VARIANT))
+ {
+ // same value as different alternative
+ variant<int, int> v0(in_place_index<0>, 42);
+ variant<int, int> v1(in_place_index<1>, 42);
+ std::hash<variant<int, int>> hash;
+ EXPECT_NE(hash(v0), hash(v1));
+ }
+#endif // !(defined(_MSC_VER) && defined(ABSL_USES_STD_VARIANT))
+
+ {
+ std::hash<variant<int>> hash;
+ std::set<size_t> hashcodes;
+ for (int i = 0; i < 100; ++i) {
+ hashcodes.insert(hash(i));
+ }
+ EXPECT_GT(hashcodes.size(), 90);
+
+ // test const-qualified
+ static_assert(type_traits_internal::IsHashable<variant<const int>>::value,
+ "");
+ static_assert(
+ type_traits_internal::IsHashable<variant<const Hashable>>::value, "");
+ std::hash<absl::variant<const int>> c_hash;
+ for (int i = 0; i < 100; ++i) {
+ EXPECT_EQ(hash(i), c_hash(i));
+ }
+ }
+}
+
+////////////////////////////////////////
+// Miscellaneous and deprecated tests //
+////////////////////////////////////////
+
+// Test that a set requiring a basic type conversion works correctly
+#if !defined(ABSL_USES_STD_VARIANT)
+TEST(VariantTest, TestConvertingSet) {
+ typedef variant<double> Variant;
+ Variant v(1.0);
+ const int two = 2;
+ v = two;
+ EXPECT_TRUE(absl::holds_alternative<double>(v));
+ ASSERT_TRUE(nullptr != absl::get_if<double>(&v));
+ EXPECT_DOUBLE_EQ(2, absl::get<double>(v));
+}
+#endif // ABSL_USES_STD_VARIANT
+
+// Test that a vector of variants behaves reasonably.
+TEST(VariantTest, Container) {
+ typedef variant<int, float> Variant;
+
+ // Creation of vector should work
+ std::vector<Variant> vec;
+ vec.push_back(Variant(10));
+ vec.push_back(Variant(20.0f));
+
+ // Vector resizing should work if we supply a value for new slots
+ vec.resize(10, Variant(0));
+}
+
+// Test that a variant with a non-copyable type can be constructed and
+// manipulated to some degree.
+TEST(VariantTest, TestVariantWithNonCopyableType) {
+ typedef variant<int, NonCopyable> Variant;
+ const int kValue = 1;
+ Variant v(kValue);
+ ASSERT_TRUE(absl::holds_alternative<int>(v));
+ EXPECT_EQ(kValue, absl::get<int>(v));
+}
+
+// Test that a variant with a non-copyable type can be transformed to
+// the non-copyable type with a call to `emplace` for different numbers
+// of arguments. We do not need to test this for each of T1 ... T8
+// because `emplace` does not overload on T1 ... to T8, so if this
+// works for any one of T1 ... T8, then it works for all of them. We
+// do need to test that it works with varying numbers of parameters
+// though.
+TEST(VariantTest, TestEmplace) {
+ typedef variant<int, NonCopyable> Variant;
+ const int kValue = 1;
+ Variant v(kValue);
+ ASSERT_TRUE(absl::holds_alternative<int>(v));
+ EXPECT_EQ(kValue, absl::get<int>(v));
+
+ // emplace with zero arguments, then back to 'int'
+ v.emplace<NonCopyable>();
+ ASSERT_TRUE(absl::holds_alternative<NonCopyable>(v));
+ EXPECT_EQ(0, absl::get<NonCopyable>(v).value);
+ v = kValue;
+ ASSERT_TRUE(absl::holds_alternative<int>(v));
+
+ // emplace with one argument:
+ v.emplace<NonCopyable>(1);
+ ASSERT_TRUE(absl::holds_alternative<NonCopyable>(v));
+ EXPECT_EQ(1, absl::get<NonCopyable>(v).value);
+ v = kValue;
+ ASSERT_TRUE(absl::holds_alternative<int>(v));
+
+ // emplace with two arguments:
+ v.emplace<NonCopyable>(1, 2);
+ ASSERT_TRUE(absl::holds_alternative<NonCopyable>(v));
+ EXPECT_EQ(3, absl::get<NonCopyable>(v).value);
+ v = kValue;
+ ASSERT_TRUE(absl::holds_alternative<int>(v));
+
+ // emplace with three arguments
+ v.emplace<NonCopyable>(1, 2, 3);
+ ASSERT_TRUE(absl::holds_alternative<NonCopyable>(v));
+ EXPECT_EQ(6, absl::get<NonCopyable>(v).value);
+ v = kValue;
+ ASSERT_TRUE(absl::holds_alternative<int>(v));
+
+ // emplace with four arguments
+ v.emplace<NonCopyable>(1, 2, 3, 4);
+ ASSERT_TRUE(absl::holds_alternative<NonCopyable>(v));
+ EXPECT_EQ(10, absl::get<NonCopyable>(v).value);
+ v = kValue;
+ ASSERT_TRUE(absl::holds_alternative<int>(v));
+}
+
+TEST(VariantTest, TestEmplaceDestroysCurrentValue) {
+ typedef variant<int, IncrementInDtor, NonCopyable> Variant;
+ int counter = 0;
+ Variant v(0);
+ ASSERT_TRUE(absl::holds_alternative<int>(v));
+ v.emplace<IncrementInDtor>(&counter);
+ ASSERT_TRUE(absl::holds_alternative<IncrementInDtor>(v));
+ ASSERT_EQ(0, counter);
+ v.emplace<NonCopyable>();
+ ASSERT_TRUE(absl::holds_alternative<NonCopyable>(v));
+ EXPECT_EQ(1, counter);
+}
+
+TEST(VariantTest, TestMoveSemantics) {
+ typedef variant<std::unique_ptr<int>, std::unique_ptr<std::string>> Variant;
+
+ // Construct a variant by moving from an element value.
+ Variant v(absl::WrapUnique(new int(10)));
+ EXPECT_TRUE(absl::holds_alternative<std::unique_ptr<int>>(v));
+
+ // Construct a variant by moving from another variant.
+ Variant v2(absl::move(v));
+ ASSERT_TRUE(absl::holds_alternative<std::unique_ptr<int>>(v2));
+ ASSERT_NE(nullptr, absl::get<std::unique_ptr<int>>(v2));
+ EXPECT_EQ(10, *absl::get<std::unique_ptr<int>>(v2));
+
+ // Moving from a variant object leaves it holding moved-from value of the
+ // same element type.
+ EXPECT_TRUE(absl::holds_alternative<std::unique_ptr<int>>(v));
+ ASSERT_NE(nullptr, absl::get_if<std::unique_ptr<int>>(&v));
+ EXPECT_EQ(nullptr, absl::get<std::unique_ptr<int>>(v));
+
+ // Assign a variant from an element value by move.
+ v = absl::make_unique<std::string>("foo");
+ ASSERT_TRUE(absl::holds_alternative<std::unique_ptr<std::string>>(v));
+ EXPECT_EQ("foo", *absl::get<std::unique_ptr<std::string>>(v));
+
+ // Move-assign a variant.
+ v2 = absl::move(v);
+ ASSERT_TRUE(absl::holds_alternative<std::unique_ptr<std::string>>(v2));
+ EXPECT_EQ("foo", *absl::get<std::unique_ptr<std::string>>(v2));
+ EXPECT_TRUE(absl::holds_alternative<std::unique_ptr<std::string>>(v));
+}
+
+variant<int, std::string> PassThrough(const variant<int, std::string>& arg) {
+ return arg;
+}
+
+TEST(VariantTest, TestImplicitConversion) {
+ EXPECT_TRUE(absl::holds_alternative<int>(PassThrough(0)));
+
+ // We still need the explicit cast for std::string, because C++ won't apply
+ // two user-defined implicit conversions in a row.
+ EXPECT_TRUE(
+ absl::holds_alternative<std::string>(PassThrough(std::string("foo"))));
+}
+
+struct Convertible2;
+struct Convertible1 {
+ Convertible1() {}
+ Convertible1(const Convertible1&) {}
+ Convertible1& operator=(const Convertible1&) { return *this; }
+
+ // implicit conversion from Convertible2
+ Convertible1(const Convertible2&) {} // NOLINT(runtime/explicit)
+};
+
+struct Convertible2 {
+ Convertible2() {}
+ Convertible2(const Convertible2&) {}
+ Convertible2& operator=(const Convertible2&) { return *this; }
+
+ // implicit conversion from Convertible1
+ Convertible2(const Convertible1&) {} // NOLINT(runtime/explicit)
+};
+
+TEST(VariantTest, TestRvalueConversion) {
+#if !defined(ABSL_USES_STD_VARIANT)
+ variant<double, std::string> var(
+ ConvertVariantTo<variant<double, std::string>>(
+ variant<std::string, int>(0)));
+ ASSERT_TRUE(absl::holds_alternative<double>(var));
+ EXPECT_EQ(0.0, absl::get<double>(var));
+
+ var = ConvertVariantTo<variant<double, std::string>>(
+ variant<const char*, float>("foo"));
+ ASSERT_TRUE(absl::holds_alternative<std::string>(var));
+ EXPECT_EQ("foo", absl::get<std::string>(var));
+
+ variant<double> singleton(
+ ConvertVariantTo<variant<double>>(variant<int, float>(42)));
+ ASSERT_TRUE(absl::holds_alternative<double>(singleton));
+ EXPECT_EQ(42.0, absl::get<double>(singleton));
+
+ singleton = ConvertVariantTo<variant<double>>(variant<int, float>(3.14f));
+ ASSERT_TRUE(absl::holds_alternative<double>(singleton));
+ EXPECT_FLOAT_EQ(3.14f, static_cast<float>(absl::get<double>(singleton)));
+
+ singleton = ConvertVariantTo<variant<double>>(variant<int>(0));
+ ASSERT_TRUE(absl::holds_alternative<double>(singleton));
+ EXPECT_EQ(0.0, absl::get<double>(singleton));
+
+ variant<int32_t, uint32_t> variant2(
+ ConvertVariantTo<variant<int32_t, uint32_t>>(variant<int32_t>(42)));
+ ASSERT_TRUE(absl::holds_alternative<int32_t>(variant2));
+ EXPECT_EQ(42, absl::get<int32_t>(variant2));
+
+ variant2 =
+ ConvertVariantTo<variant<int32_t, uint32_t>>(variant<uint32_t>(42));
+ ASSERT_TRUE(absl::holds_alternative<uint32_t>(variant2));
+ EXPECT_EQ(42, absl::get<uint32_t>(variant2));
+#endif // !ABSL_USES_STD_VARIANT
+
+ variant<Convertible1, Convertible2> variant3(
+ ConvertVariantTo<variant<Convertible1, Convertible2>>(
+ (variant<Convertible2, Convertible1>(Convertible1()))));
+ ASSERT_TRUE(absl::holds_alternative<Convertible1>(variant3));
+
+ variant3 = ConvertVariantTo<variant<Convertible1, Convertible2>>(
+ variant<Convertible2, Convertible1>(Convertible2()));
+ ASSERT_TRUE(absl::holds_alternative<Convertible2>(variant3));
+}
+
+TEST(VariantTest, TestLvalueConversion) {
+#if !defined(ABSL_USES_STD_VARIANT)
+ variant<std::string, int> source1 = 0;
+ variant<double, std::string> destination(
+ ConvertVariantTo<variant<double, std::string>>(source1));
+ ASSERT_TRUE(absl::holds_alternative<double>(destination));
+ EXPECT_EQ(0.0, absl::get<double>(destination));
+
+ variant<const char*, float> source2 = "foo";
+ destination = ConvertVariantTo<variant<double, std::string>>(source2);
+ ASSERT_TRUE(absl::holds_alternative<std::string>(destination));
+ EXPECT_EQ("foo", absl::get<std::string>(destination));
+
+ variant<int, float> source3(42);
+ variant<double> singleton(ConvertVariantTo<variant<double>>(source3));
+ ASSERT_TRUE(absl::holds_alternative<double>(singleton));
+ EXPECT_EQ(42.0, absl::get<double>(singleton));
+
+ source3 = 3.14f;
+ singleton = ConvertVariantTo<variant<double>>(source3);
+ ASSERT_TRUE(absl::holds_alternative<double>(singleton));
+ EXPECT_FLOAT_EQ(3.14f, static_cast<float>(absl::get<double>(singleton)));
+
+ variant<int> source4(0);
+ singleton = ConvertVariantTo<variant<double>>(source4);
+ ASSERT_TRUE(absl::holds_alternative<double>(singleton));
+ EXPECT_EQ(0.0, absl::get<double>(singleton));
+
+ variant<int32_t> source5(42);
+ variant<int32_t, uint32_t> variant2(
+ ConvertVariantTo<variant<int32_t, uint32_t>>(source5));
+ ASSERT_TRUE(absl::holds_alternative<int32_t>(variant2));
+ EXPECT_EQ(42, absl::get<int32_t>(variant2));
+
+ variant<uint32_t> source6(42);
+ variant2 = ConvertVariantTo<variant<int32_t, uint32_t>>(source6);
+ ASSERT_TRUE(absl::holds_alternative<uint32_t>(variant2));
+ EXPECT_EQ(42, absl::get<uint32_t>(variant2));
+#endif
+
+ variant<Convertible2, Convertible1> source7((Convertible1()));
+ variant<Convertible1, Convertible2> variant3(
+ ConvertVariantTo<variant<Convertible1, Convertible2>>(source7));
+ ASSERT_TRUE(absl::holds_alternative<Convertible1>(variant3));
+
+ source7 = Convertible2();
+ variant3 = ConvertVariantTo<variant<Convertible1, Convertible2>>(source7);
+ ASSERT_TRUE(absl::holds_alternative<Convertible2>(variant3));
+}
+
+TEST(VariantTest, TestMoveConversion) {
+ using Variant =
+ variant<std::unique_ptr<const int>, std::unique_ptr<const std::string>>;
+ using OtherVariant =
+ variant<std::unique_ptr<int>, std::unique_ptr<std::string>>;
+
+ Variant var(
+ ConvertVariantTo<Variant>(OtherVariant{absl::make_unique<int>(0)}));
+ ASSERT_TRUE(absl::holds_alternative<std::unique_ptr<const int>>(var));
+ ASSERT_NE(absl::get<std::unique_ptr<const int>>(var), nullptr);
+ EXPECT_EQ(0, *absl::get<std::unique_ptr<const int>>(var));
+
+ var = ConvertVariantTo<Variant>(
+ OtherVariant(absl::make_unique<std::string>("foo")));
+ ASSERT_TRUE(absl::holds_alternative<std::unique_ptr<const std::string>>(var));
+ EXPECT_EQ("foo", *absl::get<std::unique_ptr<const std::string>>(var));
+}
+
+TEST(VariantTest, DoesNotMoveFromLvalues) {
+ // We use shared_ptr here because it's both copyable and movable, and
+ // a moved-from shared_ptr is guaranteed to be null, so we can detect
+ // whether moving or copying has occurred.
+ using Variant =
+ variant<std::shared_ptr<const int>, std::shared_ptr<const std::string>>;
+ using OtherVariant =
+ variant<std::shared_ptr<int>, std::shared_ptr<std::string>>;
+
+ Variant v1(std::make_shared<const int>(0));
+
+ // Test copy constructor
+ Variant v2(v1);
+ EXPECT_EQ(absl::get<std::shared_ptr<const int>>(v1),
+ absl::get<std::shared_ptr<const int>>(v2));
+
+ // Test copy-assignment operator
+ v1 = std::make_shared<const std::string>("foo");
+ v2 = v1;
+ EXPECT_EQ(absl::get<std::shared_ptr<const std::string>>(v1),
+ absl::get<std::shared_ptr<const std::string>>(v2));
+
+ // Test converting copy constructor
+ OtherVariant other(std::make_shared<int>(0));
+ Variant v3(ConvertVariantTo<Variant>(other));
+ EXPECT_EQ(absl::get<std::shared_ptr<int>>(other),
+ absl::get<std::shared_ptr<const int>>(v3));
+
+ other = std::make_shared<std::string>("foo");
+ v3 = ConvertVariantTo<Variant>(other);
+ EXPECT_EQ(absl::get<std::shared_ptr<std::string>>(other),
+ absl::get<std::shared_ptr<const std::string>>(v3));
+}
+
+TEST(VariantTest, TestRvalueConversionViaConvertVariantTo) {
+#if !defined(ABSL_USES_STD_VARIANT)
+ variant<double, std::string> var(
+ ConvertVariantTo<variant<double, std::string>>(
+ variant<std::string, int>(3)));
+ EXPECT_THAT(absl::get_if<double>(&var), Pointee(3.0));
+
+ var = ConvertVariantTo<variant<double, std::string>>(
+ variant<const char*, float>("foo"));
+ EXPECT_THAT(absl::get_if<std::string>(&var), Pointee(std::string("foo")));
+
+ variant<double> singleton(
+ ConvertVariantTo<variant<double>>(variant<int, float>(42)));
+ EXPECT_THAT(absl::get_if<double>(&singleton), Pointee(42.0));
+
+ singleton = ConvertVariantTo<variant<double>>(variant<int, float>(3.14f));
+ EXPECT_THAT(absl::get_if<double>(&singleton), Pointee(DoubleEq(3.14f)));
+
+ singleton = ConvertVariantTo<variant<double>>(variant<int>(3));
+ EXPECT_THAT(absl::get_if<double>(&singleton), Pointee(3.0));
+
+ variant<int32_t, uint32_t> variant2(
+ ConvertVariantTo<variant<int32_t, uint32_t>>(variant<int32_t>(42)));
+ EXPECT_THAT(absl::get_if<int32_t>(&variant2), Pointee(42));
+
+ variant2 =
+ ConvertVariantTo<variant<int32_t, uint32_t>>(variant<uint32_t>(42));
+ EXPECT_THAT(absl::get_if<uint32_t>(&variant2), Pointee(42));
+#endif
+
+ variant<Convertible1, Convertible2> variant3(
+ ConvertVariantTo<variant<Convertible1, Convertible2>>(
+ (variant<Convertible2, Convertible1>(Convertible1()))));
+ ASSERT_TRUE(absl::holds_alternative<Convertible1>(variant3));
+
+ variant3 = ConvertVariantTo<variant<Convertible1, Convertible2>>(
+ variant<Convertible2, Convertible1>(Convertible2()));
+ ASSERT_TRUE(absl::holds_alternative<Convertible2>(variant3));
+}
+
+TEST(VariantTest, TestLvalueConversionViaConvertVariantTo) {
+#if !defined(ABSL_USES_STD_VARIANT)
+ variant<std::string, int> source1 = 3;
+ variant<double, std::string> destination(
+ ConvertVariantTo<variant<double, std::string>>(source1));
+ EXPECT_THAT(absl::get_if<double>(&destination), Pointee(3.0));
+
+ variant<const char*, float> source2 = "foo";
+ destination = ConvertVariantTo<variant<double, std::string>>(source2);
+ EXPECT_THAT(absl::get_if<std::string>(&destination),
+ Pointee(std::string("foo")));
+
+ variant<int, float> source3(42);
+ variant<double> singleton(ConvertVariantTo<variant<double>>(source3));
+ EXPECT_THAT(absl::get_if<double>(&singleton), Pointee(42.0));
+
+ source3 = 3.14f;
+ singleton = ConvertVariantTo<variant<double>>(source3);
+ EXPECT_FLOAT_EQ(3.14f, static_cast<float>(absl::get<double>(singleton)));
+ EXPECT_THAT(absl::get_if<double>(&singleton), Pointee(DoubleEq(3.14f)));
+
+ variant<int> source4(3);
+ singleton = ConvertVariantTo<variant<double>>(source4);
+ EXPECT_THAT(absl::get_if<double>(&singleton), Pointee(3.0));
+
+ variant<int32_t> source5(42);
+ variant<int32_t, uint32_t> variant2(
+ ConvertVariantTo<variant<int32_t, uint32_t>>(source5));
+ EXPECT_THAT(absl::get_if<int32_t>(&variant2), Pointee(42));
+
+ variant<uint32_t> source6(42);
+ variant2 = ConvertVariantTo<variant<int32_t, uint32_t>>(source6);
+ EXPECT_THAT(absl::get_if<uint32_t>(&variant2), Pointee(42));
+#endif // !ABSL_USES_STD_VARIANT
+
+ variant<Convertible2, Convertible1> source7((Convertible1()));
+ variant<Convertible1, Convertible2> variant3(
+ ConvertVariantTo<variant<Convertible1, Convertible2>>(source7));
+ ASSERT_TRUE(absl::holds_alternative<Convertible1>(variant3));
+
+ source7 = Convertible2();
+ variant3 = ConvertVariantTo<variant<Convertible1, Convertible2>>(source7);
+ ASSERT_TRUE(absl::holds_alternative<Convertible2>(variant3));
+}
+
+TEST(VariantTest, TestMoveConversionViaConvertVariantTo) {
+ using Variant =
+ variant<std::unique_ptr<const int>, std::unique_ptr<const std::string>>;
+ using OtherVariant =
+ variant<std::unique_ptr<int>, std::unique_ptr<std::string>>;
+
+ Variant var(
+ ConvertVariantTo<Variant>(OtherVariant{absl::make_unique<int>(3)}));
+ EXPECT_THAT(absl::get_if<std::unique_ptr<const int>>(&var),
+ Pointee(Pointee(3)));
+
+ var = ConvertVariantTo<Variant>(
+ OtherVariant(absl::make_unique<std::string>("foo")));
+ EXPECT_THAT(absl::get_if<std::unique_ptr<const std::string>>(&var),
+ Pointee(Pointee(std::string("foo"))));
+}
+
+// If all alternatives are trivially copy/move constructible, variant should
+// also be trivially copy/move constructible. This is not required by the
+// standard and we know that libstdc++ variant doesn't have this feature.
+// For more details see the paper:
+// http://open-std.org/JTC1/SC22/WG21/docs/papers/2017/p0602r0.html
+#if !(defined(ABSL_USES_STD_VARIANT) && defined(__GLIBCXX__))
+#define ABSL_VARIANT_PROPAGATE_COPY_MOVE_TRIVIALITY 1
+#endif
+
+TEST(VariantTest, TestCopyAndMoveTypeTraits) {
+ EXPECT_TRUE(std::is_copy_constructible<variant<std::string>>::value);
+ EXPECT_TRUE(absl::is_copy_assignable<variant<std::string>>::value);
+ EXPECT_TRUE(std::is_move_constructible<variant<std::string>>::value);
+ EXPECT_TRUE(absl::is_move_assignable<variant<std::string>>::value);
+ EXPECT_TRUE(std::is_move_constructible<variant<std::unique_ptr<int>>>::value);
+ EXPECT_TRUE(absl::is_move_assignable<variant<std::unique_ptr<int>>>::value);
+ EXPECT_FALSE(
+ std::is_copy_constructible<variant<std::unique_ptr<int>>>::value);
+ EXPECT_FALSE(absl::is_copy_assignable<variant<std::unique_ptr<int>>>::value);
+
+ EXPECT_FALSE(
+ absl::is_trivially_copy_constructible<variant<std::string>>::value);
+ EXPECT_FALSE(absl::is_trivially_copy_assignable<variant<std::string>>::value);
+#if ABSL_VARIANT_PROPAGATE_COPY_MOVE_TRIVIALITY
+ EXPECT_TRUE(absl::is_trivially_copy_constructible<variant<int>>::value);
+ EXPECT_TRUE(absl::is_trivially_copy_assignable<variant<int>>::value);
+ EXPECT_TRUE(is_trivially_move_constructible<variant<int>>::value);
+ EXPECT_TRUE(is_trivially_move_assignable<variant<int>>::value);
+#endif // ABSL_VARIANT_PROPAGATE_COPY_MOVE_TRIVIALITY
+}
+
+TEST(VariantTest, TestVectorOfMoveonlyVariant) {
+ // Verify that variant<MoveonlyType> works correctly as a std::vector element.
+ std::vector<variant<std::unique_ptr<int>, std::string>> vec;
+ vec.push_back(absl::make_unique<int>(42));
+ vec.emplace_back("Hello");
+ vec.reserve(3);
+ auto another_vec = absl::move(vec);
+ // As a sanity check, verify vector contents.
+ ASSERT_EQ(2, another_vec.size());
+ EXPECT_EQ(42, *absl::get<std::unique_ptr<int>>(another_vec[0]));
+ EXPECT_EQ("Hello", absl::get<std::string>(another_vec[1]));
+}
+
+TEST(VariantTest, NestedVariant) {
+#if ABSL_VARIANT_PROPAGATE_COPY_MOVE_TRIVIALITY
+ static_assert(absl::is_trivially_copy_constructible<variant<int>>(), "");
+ static_assert(absl::is_trivially_copy_assignable<variant<int>>(), "");
+ static_assert(is_trivially_move_constructible<variant<int>>(), "");
+ static_assert(is_trivially_move_assignable<variant<int>>(), "");
+
+ static_assert(absl::is_trivially_copy_constructible<variant<variant<int>>>(),
+ "");
+ static_assert(absl::is_trivially_copy_assignable<variant<variant<int>>>(),
+ "");
+ static_assert(is_trivially_move_constructible<variant<variant<int>>>(), "");
+ static_assert(is_trivially_move_assignable<variant<variant<int>>>(), "");
+#endif // ABSL_VARIANT_PROPAGATE_COPY_MOVE_TRIVIALITY
+
+ variant<int> x(42);
+ variant<variant<int>> y(x);
+ variant<variant<int>> z(y);
+ EXPECT_TRUE(absl::holds_alternative<variant<int>>(z));
+ EXPECT_EQ(x, absl::get<variant<int>>(z));
+}
+
+struct TriviallyDestructible {
+ TriviallyDestructible(TriviallyDestructible&&) {}
+ TriviallyDestructible(const TriviallyDestructible&) {}
+ TriviallyDestructible& operator=(TriviallyDestructible&&) { return *this; }
+ TriviallyDestructible& operator=(const TriviallyDestructible&) {
+ return *this;
+ }
+};
+
+struct TriviallyMovable {
+ TriviallyMovable(TriviallyMovable&&) = default;
+ TriviallyMovable(TriviallyMovable const&) {}
+ TriviallyMovable& operator=(const TriviallyMovable&) { return *this; }
+};
+
+struct TriviallyCopyable {
+ TriviallyCopyable(const TriviallyCopyable&) = default;
+ TriviallyCopyable& operator=(const TriviallyCopyable&) { return *this; }
+};
+
+struct TriviallyMoveAssignable {
+ TriviallyMoveAssignable(TriviallyMoveAssignable&&) = default;
+ TriviallyMoveAssignable(const TriviallyMoveAssignable&) {}
+ TriviallyMoveAssignable& operator=(TriviallyMoveAssignable&&) = default;
+ TriviallyMoveAssignable& operator=(const TriviallyMoveAssignable&) {
+ return *this;
+ }
+};
+
+struct TriviallyCopyAssignable {};
+
+#if ABSL_VARIANT_PROPAGATE_COPY_MOVE_TRIVIALITY
+TEST(VariantTest, TestTriviality) {
+ {
+ using TrivDestVar = absl::variant<TriviallyDestructible>;
+
+ EXPECT_FALSE(is_trivially_move_constructible<TrivDestVar>::value);
+ EXPECT_FALSE(absl::is_trivially_copy_constructible<TrivDestVar>::value);
+ EXPECT_FALSE(is_trivially_move_assignable<TrivDestVar>::value);
+ EXPECT_FALSE(absl::is_trivially_copy_assignable<TrivDestVar>::value);
+ EXPECT_TRUE(absl::is_trivially_destructible<TrivDestVar>::value);
+ }
+
+ {
+ using TrivMoveVar = absl::variant<TriviallyMovable>;
+
+ EXPECT_TRUE(is_trivially_move_constructible<TrivMoveVar>::value);
+ EXPECT_FALSE(absl::is_trivially_copy_constructible<TrivMoveVar>::value);
+ EXPECT_FALSE(is_trivially_move_assignable<TrivMoveVar>::value);
+ EXPECT_FALSE(absl::is_trivially_copy_assignable<TrivMoveVar>::value);
+ EXPECT_TRUE(absl::is_trivially_destructible<TrivMoveVar>::value);
+ }
+
+ {
+ using TrivCopyVar = absl::variant<TriviallyCopyable>;
+
+ EXPECT_TRUE(is_trivially_move_constructible<TrivCopyVar>::value);
+ EXPECT_TRUE(absl::is_trivially_copy_constructible<TrivCopyVar>::value);
+ EXPECT_FALSE(is_trivially_move_assignable<TrivCopyVar>::value);
+ EXPECT_FALSE(absl::is_trivially_copy_assignable<TrivCopyVar>::value);
+ EXPECT_TRUE(absl::is_trivially_destructible<TrivCopyVar>::value);
+ }
+
+ {
+ using TrivMoveAssignVar = absl::variant<TriviallyMoveAssignable>;
+
+ EXPECT_TRUE(is_trivially_move_constructible<TrivMoveAssignVar>::value);
+ EXPECT_FALSE(
+ absl::is_trivially_copy_constructible<TrivMoveAssignVar>::value);
+ EXPECT_TRUE(is_trivially_move_assignable<TrivMoveAssignVar>::value);
+ EXPECT_FALSE(absl::is_trivially_copy_assignable<TrivMoveAssignVar>::value);
+ EXPECT_TRUE(absl::is_trivially_destructible<TrivMoveAssignVar>::value);
+ }
+
+ {
+ using TrivCopyAssignVar = absl::variant<TriviallyCopyAssignable>;
+
+ EXPECT_TRUE(is_trivially_move_constructible<TrivCopyAssignVar>::value);
+ EXPECT_TRUE(
+ absl::is_trivially_copy_constructible<TrivCopyAssignVar>::value);
+ EXPECT_TRUE(is_trivially_move_assignable<TrivCopyAssignVar>::value);
+ EXPECT_TRUE(absl::is_trivially_copy_assignable<TrivCopyAssignVar>::value);
+ EXPECT_TRUE(absl::is_trivially_destructible<TrivCopyAssignVar>::value);
+ }
+}
+#endif // ABSL_VARIANT_PROPAGATE_COPY_MOVE_TRIVIALITY
+
+// To verify that absl::variant correctly use the nontrivial move ctor of its
+// member rather than use the trivial copy constructor.
+TEST(VariantTest, MoveCtorBug) {
+ // To simulate std::tuple in libstdc++.
+ struct TrivialCopyNontrivialMove {
+ TrivialCopyNontrivialMove() = default;
+ TrivialCopyNontrivialMove(const TrivialCopyNontrivialMove&) = default;
+ TrivialCopyNontrivialMove(TrivialCopyNontrivialMove&&) { called = true; }
+ bool called = false;
+ };
+ {
+ using V = absl::variant<TrivialCopyNontrivialMove, int>;
+ V v1(absl::in_place_index<0>);
+ // this should invoke the move ctor, rather than the trivial copy ctor.
+ V v2(std::move(v1));
+ EXPECT_TRUE(absl::get<0>(v2).called);
+ }
+ {
+ // this case failed to compile before our fix due to a GCC bug.
+ using V = absl::variant<int, TrivialCopyNontrivialMove>;
+ V v1(absl::in_place_index<1>);
+ // this should invoke the move ctor, rather than the trivial copy ctor.
+ V v2(std::move(v1));
+ EXPECT_TRUE(absl::get<1>(v2).called);
+ }
+}
+
+} // namespace
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // #if !defined(ABSL_USES_STD_VARIANT)
diff --git a/third_party/abseil/src/absl/utility/BUILD.bazel b/third_party/abseil/src/absl/utility/BUILD.bazel
new file mode 100644
index 0000000..02b2c40
--- /dev/null
+++ b/third_party/abseil/src/absl/utility/BUILD.bazel
@@ -0,0 +1,55 @@
+#
+# Copyright 2019 The Abseil Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+load("@rules_cc//cc:defs.bzl", "cc_library", "cc_test")
+load(
+ "//absl:copts/configure_copts.bzl",
+ "ABSL_DEFAULT_COPTS",
+ "ABSL_DEFAULT_LINKOPTS",
+ "ABSL_TEST_COPTS",
+)
+
+package(default_visibility = ["//visibility:public"])
+
+licenses(["notice"])
+
+cc_library(
+ name = "utility",
+ hdrs = [
+ "utility.h",
+ ],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ "//absl/base:base_internal",
+ "//absl/base:config",
+ "//absl/meta:type_traits",
+ ],
+)
+
+cc_test(
+ name = "utility_test",
+ srcs = ["utility_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":utility",
+ "//absl/base:core_headers",
+ "//absl/memory",
+ "//absl/strings",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
diff --git a/third_party/abseil/src/absl/utility/CMakeLists.txt b/third_party/abseil/src/absl/utility/CMakeLists.txt
new file mode 100644
index 0000000..e1edd19
--- /dev/null
+++ b/third_party/abseil/src/absl/utility/CMakeLists.txt
@@ -0,0 +1,44 @@
+#
+# Copyright 2017 The Abseil Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+absl_cc_library(
+ NAME
+ utility
+ HDRS
+ "utility.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::base_internal
+ absl::config
+ absl::type_traits
+ PUBLIC
+)
+
+absl_cc_test(
+ NAME
+ utility_test
+ SRCS
+ "utility_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::utility
+ absl::core_headers
+ absl::memory
+ absl::strings
+ gmock_main
+)
diff --git a/third_party/abseil/src/absl/utility/utility.h b/third_party/abseil/src/absl/utility/utility.h
new file mode 100644
index 0000000..bf92322
--- /dev/null
+++ b/third_party/abseil/src/absl/utility/utility.h
@@ -0,0 +1,350 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// This header file contains C++11 versions of standard <utility> header
+// abstractions available within C++14 and C++17, and are designed to be drop-in
+// replacement for code compliant with C++14 and C++17.
+//
+// The following abstractions are defined:
+//
+// * integer_sequence<T, Ints...> == std::integer_sequence<T, Ints...>
+// * index_sequence<Ints...> == std::index_sequence<Ints...>
+// * make_integer_sequence<T, N> == std::make_integer_sequence<T, N>
+// * make_index_sequence<N> == std::make_index_sequence<N>
+// * index_sequence_for<Ts...> == std::index_sequence_for<Ts...>
+// * apply<Functor, Tuple> == std::apply<Functor, Tuple>
+// * exchange<T> == std::exchange<T>
+// * make_from_tuple<T> == std::make_from_tuple<T>
+//
+// This header file also provides the tag types `in_place_t`, `in_place_type_t`,
+// and `in_place_index_t`, as well as the constant `in_place`, and
+// `constexpr` `std::move()` and `std::forward()` implementations in C++11.
+//
+// References:
+//
+// https://en.cppreference.com/w/cpp/utility/integer_sequence
+// https://en.cppreference.com/w/cpp/utility/apply
+// http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3658.html
+
+#ifndef ABSL_UTILITY_UTILITY_H_
+#define ABSL_UTILITY_UTILITY_H_
+
+#include <cstddef>
+#include <cstdlib>
+#include <tuple>
+#include <utility>
+
+#include "absl/base/config.h"
+#include "absl/base/internal/inline_variable.h"
+#include "absl/base/internal/invoke.h"
+#include "absl/meta/type_traits.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+// integer_sequence
+//
+// Class template representing a compile-time integer sequence. An instantiation
+// of `integer_sequence<T, Ints...>` has a sequence of integers encoded in its
+// type through its template arguments (which is a common need when
+// working with C++11 variadic templates). `absl::integer_sequence` is designed
+// to be a drop-in replacement for C++14's `std::integer_sequence`.
+//
+// Example:
+//
+// template< class T, T... Ints >
+// void user_function(integer_sequence<T, Ints...>);
+//
+// int main()
+// {
+// // user_function's `T` will be deduced to `int` and `Ints...`
+// // will be deduced to `0, 1, 2, 3, 4`.
+// user_function(make_integer_sequence<int, 5>());
+// }
+template <typename T, T... Ints>
+struct integer_sequence {
+ using value_type = T;
+ static constexpr size_t size() noexcept { return sizeof...(Ints); }
+};
+
+// index_sequence
+//
+// A helper template for an `integer_sequence` of `size_t`,
+// `absl::index_sequence` is designed to be a drop-in replacement for C++14's
+// `std::index_sequence`.
+template <size_t... Ints>
+using index_sequence = integer_sequence<size_t, Ints...>;
+
+namespace utility_internal {
+
+template <typename Seq, size_t SeqSize, size_t Rem>
+struct Extend;
+
+// Note that SeqSize == sizeof...(Ints). It's passed explicitly for efficiency.
+template <typename T, T... Ints, size_t SeqSize>
+struct Extend<integer_sequence<T, Ints...>, SeqSize, 0> {
+ using type = integer_sequence<T, Ints..., (Ints + SeqSize)...>;
+};
+
+template <typename T, T... Ints, size_t SeqSize>
+struct Extend<integer_sequence<T, Ints...>, SeqSize, 1> {
+ using type = integer_sequence<T, Ints..., (Ints + SeqSize)..., 2 * SeqSize>;
+};
+
+// Recursion helper for 'make_integer_sequence<T, N>'.
+// 'Gen<T, N>::type' is an alias for 'integer_sequence<T, 0, 1, ... N-1>'.
+template <typename T, size_t N>
+struct Gen {
+ using type =
+ typename Extend<typename Gen<T, N / 2>::type, N / 2, N % 2>::type;
+};
+
+template <typename T>
+struct Gen<T, 0> {
+ using type = integer_sequence<T>;
+};
+
+template <typename T>
+struct InPlaceTypeTag {
+ explicit InPlaceTypeTag() = delete;
+ InPlaceTypeTag(const InPlaceTypeTag&) = delete;
+ InPlaceTypeTag& operator=(const InPlaceTypeTag&) = delete;
+};
+
+template <size_t I>
+struct InPlaceIndexTag {
+ explicit InPlaceIndexTag() = delete;
+ InPlaceIndexTag(const InPlaceIndexTag&) = delete;
+ InPlaceIndexTag& operator=(const InPlaceIndexTag&) = delete;
+};
+
+} // namespace utility_internal
+
+// Compile-time sequences of integers
+
+// make_integer_sequence
+//
+// This template alias is equivalent to
+// `integer_sequence<int, 0, 1, ..., N-1>`, and is designed to be a drop-in
+// replacement for C++14's `std::make_integer_sequence`.
+template <typename T, T N>
+using make_integer_sequence = typename utility_internal::Gen<T, N>::type;
+
+// make_index_sequence
+//
+// This template alias is equivalent to `index_sequence<0, 1, ..., N-1>`,
+// and is designed to be a drop-in replacement for C++14's
+// `std::make_index_sequence`.
+template <size_t N>
+using make_index_sequence = make_integer_sequence<size_t, N>;
+
+// index_sequence_for
+//
+// Converts a typename pack into an index sequence of the same length, and
+// is designed to be a drop-in replacement for C++14's
+// `std::index_sequence_for()`
+template <typename... Ts>
+using index_sequence_for = make_index_sequence<sizeof...(Ts)>;
+
+// Tag types
+
+#ifdef ABSL_USES_STD_OPTIONAL
+
+using std::in_place_t;
+using std::in_place;
+
+#else // ABSL_USES_STD_OPTIONAL
+
+// in_place_t
+//
+// Tag type used to specify in-place construction, such as with
+// `absl::optional`, designed to be a drop-in replacement for C++17's
+// `std::in_place_t`.
+struct in_place_t {};
+
+ABSL_INTERNAL_INLINE_CONSTEXPR(in_place_t, in_place, {});
+
+#endif // ABSL_USES_STD_OPTIONAL
+
+#if defined(ABSL_USES_STD_ANY) || defined(ABSL_USES_STD_VARIANT)
+using std::in_place_type;
+using std::in_place_type_t;
+#else
+
+// in_place_type_t
+//
+// Tag type used for in-place construction when the type to construct needs to
+// be specified, such as with `absl::any`, designed to be a drop-in replacement
+// for C++17's `std::in_place_type_t`.
+template <typename T>
+using in_place_type_t = void (*)(utility_internal::InPlaceTypeTag<T>);
+
+template <typename T>
+void in_place_type(utility_internal::InPlaceTypeTag<T>) {}
+#endif // ABSL_USES_STD_ANY || ABSL_USES_STD_VARIANT
+
+#ifdef ABSL_USES_STD_VARIANT
+using std::in_place_index;
+using std::in_place_index_t;
+#else
+
+// in_place_index_t
+//
+// Tag type used for in-place construction when the type to construct needs to
+// be specified, such as with `absl::any`, designed to be a drop-in replacement
+// for C++17's `std::in_place_index_t`.
+template <size_t I>
+using in_place_index_t = void (*)(utility_internal::InPlaceIndexTag<I>);
+
+template <size_t I>
+void in_place_index(utility_internal::InPlaceIndexTag<I>) {}
+#endif // ABSL_USES_STD_VARIANT
+
+// Constexpr move and forward
+
+// move()
+//
+// A constexpr version of `std::move()`, designed to be a drop-in replacement
+// for C++14's `std::move()`.
+template <typename T>
+constexpr absl::remove_reference_t<T>&& move(T&& t) noexcept {
+ return static_cast<absl::remove_reference_t<T>&&>(t);
+}
+
+// forward()
+//
+// A constexpr version of `std::forward()`, designed to be a drop-in replacement
+// for C++14's `std::forward()`.
+template <typename T>
+constexpr T&& forward(
+ absl::remove_reference_t<T>& t) noexcept { // NOLINT(runtime/references)
+ return static_cast<T&&>(t);
+}
+
+namespace utility_internal {
+// Helper method for expanding tuple into a called method.
+template <typename Functor, typename Tuple, std::size_t... Indexes>
+auto apply_helper(Functor&& functor, Tuple&& t, index_sequence<Indexes...>)
+ -> decltype(absl::base_internal::invoke(
+ absl::forward<Functor>(functor),
+ std::get<Indexes>(absl::forward<Tuple>(t))...)) {
+ return absl::base_internal::invoke(
+ absl::forward<Functor>(functor),
+ std::get<Indexes>(absl::forward<Tuple>(t))...);
+}
+
+} // namespace utility_internal
+
+// apply
+//
+// Invokes a Callable using elements of a tuple as its arguments.
+// Each element of the tuple corresponds to an argument of the call (in order).
+// Both the Callable argument and the tuple argument are perfect-forwarded.
+// For member-function Callables, the first tuple element acts as the `this`
+// pointer. `absl::apply` is designed to be a drop-in replacement for C++17's
+// `std::apply`. Unlike C++17's `std::apply`, this is not currently `constexpr`.
+//
+// Example:
+//
+// class Foo {
+// public:
+// void Bar(int);
+// };
+// void user_function1(int, std::string);
+// void user_function2(std::unique_ptr<Foo>);
+// auto user_lambda = [](int, int) {};
+//
+// int main()
+// {
+// std::tuple<int, std::string> tuple1(42, "bar");
+// // Invokes the first user function on int, std::string.
+// absl::apply(&user_function1, tuple1);
+//
+// std::tuple<std::unique_ptr<Foo>> tuple2(absl::make_unique<Foo>());
+// // Invokes the user function that takes ownership of the unique
+// // pointer.
+// absl::apply(&user_function2, std::move(tuple2));
+//
+// auto foo = absl::make_unique<Foo>();
+// std::tuple<Foo*, int> tuple3(foo.get(), 42);
+// // Invokes the method Bar on foo with one argument, 42.
+// absl::apply(&Foo::Bar, tuple3);
+//
+// std::tuple<int, int> tuple4(8, 9);
+// // Invokes a lambda.
+// absl::apply(user_lambda, tuple4);
+// }
+template <typename Functor, typename Tuple>
+auto apply(Functor&& functor, Tuple&& t)
+ -> decltype(utility_internal::apply_helper(
+ absl::forward<Functor>(functor), absl::forward<Tuple>(t),
+ absl::make_index_sequence<std::tuple_size<
+ typename std::remove_reference<Tuple>::type>::value>{})) {
+ return utility_internal::apply_helper(
+ absl::forward<Functor>(functor), absl::forward<Tuple>(t),
+ absl::make_index_sequence<std::tuple_size<
+ typename std::remove_reference<Tuple>::type>::value>{});
+}
+
+// exchange
+//
+// Replaces the value of `obj` with `new_value` and returns the old value of
+// `obj`. `absl::exchange` is designed to be a drop-in replacement for C++14's
+// `std::exchange`.
+//
+// Example:
+//
+// Foo& operator=(Foo&& other) {
+// ptr1_ = absl::exchange(other.ptr1_, nullptr);
+// int1_ = absl::exchange(other.int1_, -1);
+// return *this;
+// }
+template <typename T, typename U = T>
+T exchange(T& obj, U&& new_value) {
+ T old_value = absl::move(obj);
+ obj = absl::forward<U>(new_value);
+ return old_value;
+}
+
+namespace utility_internal {
+template <typename T, typename Tuple, size_t... I>
+T make_from_tuple_impl(Tuple&& tup, absl::index_sequence<I...>) {
+ return T(std::get<I>(std::forward<Tuple>(tup))...);
+}
+} // namespace utility_internal
+
+// make_from_tuple
+//
+// Given the template parameter type `T` and a tuple of arguments
+// `std::tuple(arg0, arg1, ..., argN)` constructs an object of type `T` as if by
+// calling `T(arg0, arg1, ..., argN)`.
+//
+// Example:
+//
+// std::tuple<const char*, size_t> args("hello world", 5);
+// auto s = absl::make_from_tuple<std::string>(args);
+// assert(s == "hello");
+//
+template <typename T, typename Tuple>
+constexpr T make_from_tuple(Tuple&& tup) {
+ return utility_internal::make_from_tuple_impl<T>(
+ std::forward<Tuple>(tup),
+ absl::make_index_sequence<
+ std::tuple_size<absl::decay_t<Tuple>>::value>{});
+}
+
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_UTILITY_UTILITY_H_
diff --git a/third_party/abseil/src/absl/utility/utility_test.cc b/third_party/abseil/src/absl/utility/utility_test.cc
new file mode 100644
index 0000000..f044ad6
--- /dev/null
+++ b/third_party/abseil/src/absl/utility/utility_test.cc
@@ -0,0 +1,376 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/utility/utility.h"
+
+#include <sstream>
+#include <string>
+#include <tuple>
+#include <type_traits>
+#include <vector>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/base/attributes.h"
+#include "absl/memory/memory.h"
+#include "absl/strings/str_cat.h"
+
+namespace {
+
+#ifdef _MSC_VER
+// Warnings for unused variables in this test are false positives. On other
+// platforms, they are suppressed by ABSL_ATTRIBUTE_UNUSED, but that doesn't
+// work on MSVC.
+// Both the unused variables and the name length warnings are due to calls
+// to absl::make_index_sequence with very large values, creating very long type
+// names. The resulting warnings are so long they make build output unreadable.
+#pragma warning( push )
+#pragma warning( disable : 4503 ) // decorated name length exceeded
+#pragma warning( disable : 4101 ) // unreferenced local variable
+#endif // _MSC_VER
+
+using ::testing::ElementsAre;
+using ::testing::Pointee;
+using ::testing::StaticAssertTypeEq;
+
+TEST(IntegerSequenceTest, ValueType) {
+ StaticAssertTypeEq<int, absl::integer_sequence<int>::value_type>();
+ StaticAssertTypeEq<char, absl::integer_sequence<char>::value_type>();
+}
+
+TEST(IntegerSequenceTest, Size) {
+ EXPECT_EQ(0, (absl::integer_sequence<int>::size()));
+ EXPECT_EQ(1, (absl::integer_sequence<int, 0>::size()));
+ EXPECT_EQ(1, (absl::integer_sequence<int, 1>::size()));
+ EXPECT_EQ(2, (absl::integer_sequence<int, 1, 2>::size()));
+ EXPECT_EQ(3, (absl::integer_sequence<int, 0, 1, 2>::size()));
+ EXPECT_EQ(3, (absl::integer_sequence<int, -123, 123, 456>::size()));
+ constexpr size_t sz = absl::integer_sequence<int, 0, 1>::size();
+ EXPECT_EQ(2, sz);
+}
+
+TEST(IntegerSequenceTest, MakeIndexSequence) {
+ StaticAssertTypeEq<absl::index_sequence<>, absl::make_index_sequence<0>>();
+ StaticAssertTypeEq<absl::index_sequence<0>, absl::make_index_sequence<1>>();
+ StaticAssertTypeEq<absl::index_sequence<0, 1>,
+ absl::make_index_sequence<2>>();
+ StaticAssertTypeEq<absl::index_sequence<0, 1, 2>,
+ absl::make_index_sequence<3>>();
+}
+
+TEST(IntegerSequenceTest, MakeIntegerSequence) {
+ StaticAssertTypeEq<absl::integer_sequence<int>,
+ absl::make_integer_sequence<int, 0>>();
+ StaticAssertTypeEq<absl::integer_sequence<int, 0>,
+ absl::make_integer_sequence<int, 1>>();
+ StaticAssertTypeEq<absl::integer_sequence<int, 0, 1>,
+ absl::make_integer_sequence<int, 2>>();
+ StaticAssertTypeEq<absl::integer_sequence<int, 0, 1, 2>,
+ absl::make_integer_sequence<int, 3>>();
+}
+
+template <typename... Ts>
+class Counter {};
+
+template <size_t... Is>
+void CountAll(absl::index_sequence<Is...>) {
+ // We only need an alias here, but instantiate a variable to silence warnings
+ // for unused typedefs in some compilers.
+ ABSL_ATTRIBUTE_UNUSED Counter<absl::make_index_sequence<Is>...> seq;
+}
+
+// This test verifies that absl::make_index_sequence can handle large arguments
+// without blowing up template instantiation stack, going OOM or taking forever
+// to compile (there is hard 15 minutes limit imposed by forge).
+TEST(IntegerSequenceTest, MakeIndexSequencePerformance) {
+ // O(log N) template instantiations.
+ // We only need an alias here, but instantiate a variable to silence warnings
+ // for unused typedefs in some compilers.
+ ABSL_ATTRIBUTE_UNUSED absl::make_index_sequence<(1 << 16) - 1> seq;
+ // O(N) template instantiations.
+ CountAll(absl::make_index_sequence<(1 << 8) - 1>());
+}
+
+template <typename F, typename Tup, size_t... Is>
+auto ApplyFromTupleImpl(F f, const Tup& tup, absl::index_sequence<Is...>)
+ -> decltype(f(std::get<Is>(tup)...)) {
+ return f(std::get<Is>(tup)...);
+}
+
+template <typename Tup>
+using TupIdxSeq = absl::make_index_sequence<std::tuple_size<Tup>::value>;
+
+template <typename F, typename Tup>
+auto ApplyFromTuple(F f, const Tup& tup)
+ -> decltype(ApplyFromTupleImpl(f, tup, TupIdxSeq<Tup>{})) {
+ return ApplyFromTupleImpl(f, tup, TupIdxSeq<Tup>{});
+}
+
+template <typename T>
+std::string Fmt(const T& x) {
+ std::ostringstream os;
+ os << x;
+ return os.str();
+}
+
+struct PoorStrCat {
+ template <typename... Args>
+ std::string operator()(const Args&... args) const {
+ std::string r;
+ for (const auto& e : {Fmt(args)...}) r += e;
+ return r;
+ }
+};
+
+template <typename Tup, size_t... Is>
+std::vector<std::string> TupStringVecImpl(const Tup& tup,
+ absl::index_sequence<Is...>) {
+ return {Fmt(std::get<Is>(tup))...};
+}
+
+template <typename... Ts>
+std::vector<std::string> TupStringVec(const std::tuple<Ts...>& tup) {
+ return TupStringVecImpl(tup, absl::index_sequence_for<Ts...>());
+}
+
+TEST(MakeIndexSequenceTest, ApplyFromTupleExample) {
+ PoorStrCat f{};
+ EXPECT_EQ("12abc3.14", f(12, "abc", 3.14));
+ EXPECT_EQ("12abc3.14", ApplyFromTuple(f, std::make_tuple(12, "abc", 3.14)));
+}
+
+TEST(IndexSequenceForTest, Basic) {
+ StaticAssertTypeEq<absl::index_sequence<>, absl::index_sequence_for<>>();
+ StaticAssertTypeEq<absl::index_sequence<0>, absl::index_sequence_for<int>>();
+ StaticAssertTypeEq<absl::index_sequence<0, 1, 2, 3>,
+ absl::index_sequence_for<int, void, char, int>>();
+}
+
+TEST(IndexSequenceForTest, Example) {
+ EXPECT_THAT(TupStringVec(std::make_tuple(12, "abc", 3.14)),
+ ElementsAre("12", "abc", "3.14"));
+}
+
+int Function(int a, int b) { return a - b; }
+
+int Sink(std::unique_ptr<int> p) { return *p; }
+
+std::unique_ptr<int> Factory(int n) { return absl::make_unique<int>(n); }
+
+void NoOp() {}
+
+struct ConstFunctor {
+ int operator()(int a, int b) const { return a - b; }
+};
+
+struct MutableFunctor {
+ int operator()(int a, int b) { return a - b; }
+};
+
+struct EphemeralFunctor {
+ EphemeralFunctor() {}
+ EphemeralFunctor(const EphemeralFunctor&) {}
+ EphemeralFunctor(EphemeralFunctor&&) {}
+ int operator()(int a, int b) && { return a - b; }
+};
+
+struct OverloadedFunctor {
+ OverloadedFunctor() {}
+ OverloadedFunctor(const OverloadedFunctor&) {}
+ OverloadedFunctor(OverloadedFunctor&&) {}
+ template <typename... Args>
+ std::string operator()(const Args&... args) & {
+ return absl::StrCat("&", args...);
+ }
+ template <typename... Args>
+ std::string operator()(const Args&... args) const& {
+ return absl::StrCat("const&", args...);
+ }
+ template <typename... Args>
+ std::string operator()(const Args&... args) && {
+ return absl::StrCat("&&", args...);
+ }
+};
+
+struct Class {
+ int Method(int a, int b) { return a - b; }
+ int ConstMethod(int a, int b) const { return a - b; }
+
+ int member;
+};
+
+struct FlipFlop {
+ int ConstMethod() const { return member; }
+ FlipFlop operator*() const { return {-member}; }
+
+ int member;
+};
+
+TEST(ApplyTest, Function) {
+ EXPECT_EQ(1, absl::apply(Function, std::make_tuple(3, 2)));
+ EXPECT_EQ(1, absl::apply(&Function, std::make_tuple(3, 2)));
+}
+
+TEST(ApplyTest, NonCopyableArgument) {
+ EXPECT_EQ(42, absl::apply(Sink, std::make_tuple(absl::make_unique<int>(42))));
+}
+
+TEST(ApplyTest, NonCopyableResult) {
+ EXPECT_THAT(absl::apply(Factory, std::make_tuple(42)),
+ ::testing::Pointee(42));
+}
+
+TEST(ApplyTest, VoidResult) { absl::apply(NoOp, std::tuple<>()); }
+
+TEST(ApplyTest, ConstFunctor) {
+ EXPECT_EQ(1, absl::apply(ConstFunctor(), std::make_tuple(3, 2)));
+}
+
+TEST(ApplyTest, MutableFunctor) {
+ MutableFunctor f;
+ EXPECT_EQ(1, absl::apply(f, std::make_tuple(3, 2)));
+ EXPECT_EQ(1, absl::apply(MutableFunctor(), std::make_tuple(3, 2)));
+}
+TEST(ApplyTest, EphemeralFunctor) {
+ EphemeralFunctor f;
+ EXPECT_EQ(1, absl::apply(std::move(f), std::make_tuple(3, 2)));
+ EXPECT_EQ(1, absl::apply(EphemeralFunctor(), std::make_tuple(3, 2)));
+}
+TEST(ApplyTest, OverloadedFunctor) {
+ OverloadedFunctor f;
+ const OverloadedFunctor& cf = f;
+
+ EXPECT_EQ("&", absl::apply(f, std::tuple<>{}));
+ EXPECT_EQ("& 42", absl::apply(f, std::make_tuple(" 42")));
+
+ EXPECT_EQ("const&", absl::apply(cf, std::tuple<>{}));
+ EXPECT_EQ("const& 42", absl::apply(cf, std::make_tuple(" 42")));
+
+ EXPECT_EQ("&&", absl::apply(std::move(f), std::tuple<>{}));
+ OverloadedFunctor f2;
+ EXPECT_EQ("&& 42", absl::apply(std::move(f2), std::make_tuple(" 42")));
+}
+
+TEST(ApplyTest, ReferenceWrapper) {
+ ConstFunctor cf;
+ MutableFunctor mf;
+ EXPECT_EQ(1, absl::apply(std::cref(cf), std::make_tuple(3, 2)));
+ EXPECT_EQ(1, absl::apply(std::ref(cf), std::make_tuple(3, 2)));
+ EXPECT_EQ(1, absl::apply(std::ref(mf), std::make_tuple(3, 2)));
+}
+
+TEST(ApplyTest, MemberFunction) {
+ std::unique_ptr<Class> p(new Class);
+ std::unique_ptr<const Class> cp(new Class);
+ EXPECT_EQ(
+ 1, absl::apply(&Class::Method,
+ std::tuple<std::unique_ptr<Class>&, int, int>(p, 3, 2)));
+ EXPECT_EQ(1, absl::apply(&Class::Method,
+ std::tuple<Class*, int, int>(p.get(), 3, 2)));
+ EXPECT_EQ(
+ 1, absl::apply(&Class::Method, std::tuple<Class&, int, int>(*p, 3, 2)));
+
+ EXPECT_EQ(
+ 1, absl::apply(&Class::ConstMethod,
+ std::tuple<std::unique_ptr<Class>&, int, int>(p, 3, 2)));
+ EXPECT_EQ(1, absl::apply(&Class::ConstMethod,
+ std::tuple<Class*, int, int>(p.get(), 3, 2)));
+ EXPECT_EQ(1, absl::apply(&Class::ConstMethod,
+ std::tuple<Class&, int, int>(*p, 3, 2)));
+
+ EXPECT_EQ(1, absl::apply(&Class::ConstMethod,
+ std::tuple<std::unique_ptr<const Class>&, int, int>(
+ cp, 3, 2)));
+ EXPECT_EQ(1, absl::apply(&Class::ConstMethod,
+ std::tuple<const Class*, int, int>(cp.get(), 3, 2)));
+ EXPECT_EQ(1, absl::apply(&Class::ConstMethod,
+ std::tuple<const Class&, int, int>(*cp, 3, 2)));
+
+ EXPECT_EQ(1, absl::apply(&Class::Method,
+ std::make_tuple(absl::make_unique<Class>(), 3, 2)));
+ EXPECT_EQ(1, absl::apply(&Class::ConstMethod,
+ std::make_tuple(absl::make_unique<Class>(), 3, 2)));
+ EXPECT_EQ(
+ 1, absl::apply(&Class::ConstMethod,
+ std::make_tuple(absl::make_unique<const Class>(), 3, 2)));
+}
+
+TEST(ApplyTest, DataMember) {
+ std::unique_ptr<Class> p(new Class{42});
+ std::unique_ptr<const Class> cp(new Class{42});
+ EXPECT_EQ(
+ 42, absl::apply(&Class::member, std::tuple<std::unique_ptr<Class>&>(p)));
+ EXPECT_EQ(42, absl::apply(&Class::member, std::tuple<Class&>(*p)));
+ EXPECT_EQ(42, absl::apply(&Class::member, std::tuple<Class*>(p.get())));
+
+ absl::apply(&Class::member, std::tuple<std::unique_ptr<Class>&>(p)) = 42;
+ absl::apply(&Class::member, std::tuple<Class*>(p.get())) = 42;
+ absl::apply(&Class::member, std::tuple<Class&>(*p)) = 42;
+
+ EXPECT_EQ(42, absl::apply(&Class::member,
+ std::tuple<std::unique_ptr<const Class>&>(cp)));
+ EXPECT_EQ(42, absl::apply(&Class::member, std::tuple<const Class&>(*cp)));
+ EXPECT_EQ(42,
+ absl::apply(&Class::member, std::tuple<const Class*>(cp.get())));
+}
+
+TEST(ApplyTest, FlipFlop) {
+ FlipFlop obj = {42};
+ // This call could resolve to (obj.*&FlipFlop::ConstMethod)() or
+ // ((*obj).*&FlipFlop::ConstMethod)(). We verify that it's the former.
+ EXPECT_EQ(42, absl::apply(&FlipFlop::ConstMethod, std::make_tuple(obj)));
+ EXPECT_EQ(42, absl::apply(&FlipFlop::member, std::make_tuple(obj)));
+}
+
+TEST(ExchangeTest, MoveOnly) {
+ auto a = Factory(1);
+ EXPECT_EQ(1, *a);
+ auto b = absl::exchange(a, Factory(2));
+ EXPECT_EQ(2, *a);
+ EXPECT_EQ(1, *b);
+}
+
+TEST(MakeFromTupleTest, String) {
+ EXPECT_EQ(
+ absl::make_from_tuple<std::string>(std::make_tuple("hello world", 5)),
+ "hello");
+}
+
+TEST(MakeFromTupleTest, MoveOnlyParameter) {
+ struct S {
+ S(std::unique_ptr<int> n, std::unique_ptr<int> m) : value(*n + *m) {}
+ int value = 0;
+ };
+ auto tup =
+ std::make_tuple(absl::make_unique<int>(3), absl::make_unique<int>(4));
+ auto s = absl::make_from_tuple<S>(std::move(tup));
+ EXPECT_EQ(s.value, 7);
+}
+
+TEST(MakeFromTupleTest, NoParameters) {
+ struct S {
+ S() : value(1) {}
+ int value = 2;
+ };
+ EXPECT_EQ(absl::make_from_tuple<S>(std::make_tuple()).value, 1);
+}
+
+TEST(MakeFromTupleTest, Pair) {
+ EXPECT_EQ(
+ (absl::make_from_tuple<std::pair<bool, int>>(std::make_tuple(true, 17))),
+ std::make_pair(true, 17));
+}
+
+} // namespace
+
diff --git a/third_party/abseil/src/ci/absl_alternate_options.h b/third_party/abseil/src/ci/absl_alternate_options.h
new file mode 100644
index 0000000..29b020d
--- /dev/null
+++ b/third_party/abseil/src/ci/absl_alternate_options.h
@@ -0,0 +1,29 @@
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Alternate options.h file, used in continuous integration testing to exercise
+// option settings not used by default.
+
+#ifndef ABSL_BASE_OPTIONS_H_
+#define ABSL_BASE_OPTIONS_H_
+
+#define ABSL_OPTION_USE_STD_ANY 0
+#define ABSL_OPTION_USE_STD_OPTIONAL 0
+#define ABSL_OPTION_USE_STD_STRING_VIEW 0
+#define ABSL_OPTION_USE_STD_VARIANT 0
+#define ABSL_OPTION_USE_INLINE_NAMESPACE 1
+#define ABSL_OPTION_INLINE_NAMESPACE_NAME ns
+#define ABSL_OPTION_HARDENED 1
+
+#endif // ABSL_BASE_OPTIONS_H_
diff --git a/third_party/abseil/src/ci/cmake_common.sh b/third_party/abseil/src/ci/cmake_common.sh
new file mode 100644
index 0000000..aec8a11
--- /dev/null
+++ b/third_party/abseil/src/ci/cmake_common.sh
@@ -0,0 +1,25 @@
+# Copyright 2020 The Abseil Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# The commit of GoogleTest to be used in the CMake tests in this directory.
+# Keep this in sync with the commit in the WORKSPACE file.
+readonly ABSL_GOOGLETEST_COMMIT="8567b09290fe402cf01923e2131c5635b8ed851b"
+
+# Avoid depending on GitHub by looking for a cached copy of the commit first.
+if [[ -r "${KOKORO_GFILE_DIR:-}/distdir/${ABSL_GOOGLETEST_COMMIT}.zip" ]]; then
+ DOCKER_EXTRA_ARGS="--mount type=bind,source=${KOKORO_GFILE_DIR}/distdir,target=/distdir,readonly ${DOCKER_EXTRA_ARGS:-}"
+ ABSL_GOOGLETEST_DOWNLOAD_URL="file:///distdir/${ABSL_GOOGLETEST_COMMIT}.zip"
+else
+ ABSL_GOOGLETEST_DOWNLOAD_URL="https://github.com/google/googletest/archive/${ABSL_GOOGLETEST_COMMIT}.zip"
+fi
diff --git a/third_party/abseil/src/ci/cmake_install_test.sh b/third_party/abseil/src/ci/cmake_install_test.sh
new file mode 100755
index 0000000..5bf540c
--- /dev/null
+++ b/third_party/abseil/src/ci/cmake_install_test.sh
@@ -0,0 +1,37 @@
+#!/bin/bash
+#
+# Copyright 2019 The Abseil Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+set -euox pipefail
+
+if [[ -z ${ABSEIL_ROOT:-} ]]; then
+ ABSEIL_ROOT="$(realpath $(dirname ${0})/..)"
+fi
+
+source "${ABSEIL_ROOT}/ci/cmake_common.sh"
+
+source "${ABSEIL_ROOT}/ci/linux_docker_containers.sh"
+readonly DOCKER_CONTAINER=${LINUX_GCC_LATEST_CONTAINER}
+
+time docker run \
+ --mount type=bind,source="${ABSEIL_ROOT}",target=/abseil-cpp,readonly \
+ --workdir=/abseil-cpp \
+ --tmpfs=/buildfs:exec \
+ --cap-add=SYS_PTRACE \
+ --rm \
+ -e CFLAGS="-Werror" \
+ -e CXXFLAGS="-Werror" \
+ ${DOCKER_CONTAINER} \
+ /bin/bash CMake/install_test_project/test.sh $@
diff --git a/third_party/abseil/src/ci/linux_clang-latest_libcxx_asan_bazel.sh b/third_party/abseil/src/ci/linux_clang-latest_libcxx_asan_bazel.sh
new file mode 100755
index 0000000..ffbb832
--- /dev/null
+++ b/third_party/abseil/src/ci/linux_clang-latest_libcxx_asan_bazel.sh
@@ -0,0 +1,99 @@
+#!/bin/bash
+#
+# Copyright 2019 The Abseil Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# This script that can be invoked to test abseil-cpp in a hermetic environment
+# using a Docker image on Linux. You must have Docker installed to use this
+# script.
+
+set -euox pipefail
+
+if [[ -z ${ABSEIL_ROOT:-} ]]; then
+ ABSEIL_ROOT="$(realpath $(dirname ${0})/..)"
+fi
+
+if [[ -z ${STD:-} ]]; then
+ STD="c++11 c++14 c++17 c++20"
+fi
+
+if [[ -z ${COMPILATION_MODE:-} ]]; then
+ COMPILATION_MODE="fastbuild opt"
+fi
+
+if [[ -z ${EXCEPTIONS_MODE:-} ]]; then
+ EXCEPTIONS_MODE="-fno-exceptions -fexceptions"
+fi
+
+source "${ABSEIL_ROOT}/ci/linux_docker_containers.sh"
+readonly DOCKER_CONTAINER=${LINUX_CLANG_LATEST_CONTAINER}
+
+# USE_BAZEL_CACHE=1 only works on Kokoro.
+# Without access to the credentials this won't work.
+if [[ ${USE_BAZEL_CACHE:-0} -ne 0 ]]; then
+ DOCKER_EXTRA_ARGS="--mount type=bind,source=${KOKORO_KEYSTORE_DIR},target=/keystore,readonly ${DOCKER_EXTRA_ARGS:-}"
+ # Bazel doesn't track changes to tools outside of the workspace
+ # (e.g. /usr/bin/gcc), so by appending the docker container to the
+ # remote_http_cache url, we make changes to the container part of
+ # the cache key. Hashing the key is to make it shorter and url-safe.
+ container_key=$(echo ${DOCKER_CONTAINER} | sha256sum | head -c 16)
+ BAZEL_EXTRA_ARGS="--remote_http_cache=https://storage.googleapis.com/absl-bazel-remote-cache/${container_key} --google_credentials=/keystore/73103_absl-bazel-remote-cache ${BAZEL_EXTRA_ARGS:-}"
+fi
+
+# Avoid depending on external sites like GitHub by checking --distdir for
+# external dependencies first.
+# https://docs.bazel.build/versions/master/guide.html#distdir
+if [[ ${KOKORO_GFILE_DIR:-} ]] && [[ -d "${KOKORO_GFILE_DIR}/distdir" ]]; then
+ DOCKER_EXTRA_ARGS="--mount type=bind,source=${KOKORO_GFILE_DIR}/distdir,target=/distdir,readonly ${DOCKER_EXTRA_ARGS:-}"
+ BAZEL_EXTRA_ARGS="--distdir=/distdir ${BAZEL_EXTRA_ARGS:-}"
+fi
+
+for std in ${STD}; do
+ for compilation_mode in ${COMPILATION_MODE}; do
+ for exceptions_mode in ${EXCEPTIONS_MODE}; do
+ echo "--------------------------------------------------------------------"
+ time docker run \
+ --mount type=bind,source="${ABSEIL_ROOT}",target=/abseil-cpp,readonly \
+ --workdir=/abseil-cpp \
+ --cap-add=SYS_PTRACE \
+ --rm \
+ -e CC="/opt/llvm/clang/bin/clang" \
+ -e BAZEL_CXXOPTS="-std=${std}:-nostdinc++" \
+ -e BAZEL_LINKOPTS="-L/opt/llvm/libcxx/lib:-lc++:-lc++abi:-lm:-Wl,-rpath=/opt/llvm/libcxx/lib" \
+ -e CPLUS_INCLUDE_PATH="/opt/llvm/libcxx/include/c++/v1" \
+ ${DOCKER_EXTRA_ARGS:-} \
+ ${DOCKER_CONTAINER} \
+ /usr/local/bin/bazel test ... \
+ --compilation_mode="${compilation_mode}" \
+ --copt="${exceptions_mode}" \
+ --copt="-fsanitize=address" \
+ --copt="-fsanitize=float-divide-by-zero" \
+ --copt="-fsanitize=nullability" \
+ --copt="-fsanitize=undefined" \
+ --copt="-fno-sanitize-blacklist" \
+ --copt=-Werror \
+ --keep_going \
+ --linkopt="-fsanitize=address" \
+ --linkopt="-fsanitize-link-c++-runtime" \
+ --show_timestamps \
+ --test_env="ASAN_SYMBOLIZER_PATH=/opt/llvm/clang/bin/llvm-symbolizer" \
+ --test_env="TZDIR=/abseil-cpp/absl/time/internal/cctz/testdata/zoneinfo" \
+ --test_env="UBSAN_OPTIONS=print_stacktrace=1" \
+ --test_env="UBSAN_SYMBOLIZER_PATH=/opt/llvm/clang/bin/llvm-symbolizer" \
+ --test_output=errors \
+ --test_tag_filters="-benchmark,-noasan" \
+ ${BAZEL_EXTRA_ARGS:-}
+ done
+ done
+done
diff --git a/third_party/abseil/src/ci/linux_clang-latest_libcxx_bazel.sh b/third_party/abseil/src/ci/linux_clang-latest_libcxx_bazel.sh
new file mode 100755
index 0000000..f6a2221
--- /dev/null
+++ b/third_party/abseil/src/ci/linux_clang-latest_libcxx_bazel.sh
@@ -0,0 +1,97 @@
+#!/bin/bash
+#
+# Copyright 2019 The Abseil Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# This script that can be invoked to test abseil-cpp in a hermetic environment
+# using a Docker image on Linux. You must have Docker installed to use this
+# script.
+
+set -euox pipefail
+
+if [[ -z ${ABSEIL_ROOT:-} ]]; then
+ ABSEIL_ROOT="$(realpath $(dirname ${0})/..)"
+fi
+
+if [[ -z ${STD:-} ]]; then
+ STD="c++11 c++14 c++17 c++20"
+fi
+
+if [[ -z ${COMPILATION_MODE:-} ]]; then
+ COMPILATION_MODE="fastbuild opt"
+fi
+
+if [[ -z ${EXCEPTIONS_MODE:-} ]]; then
+ EXCEPTIONS_MODE="-fno-exceptions -fexceptions"
+fi
+
+source "${ABSEIL_ROOT}/ci/linux_docker_containers.sh"
+readonly DOCKER_CONTAINER=${LINUX_CLANG_LATEST_CONTAINER}
+
+# USE_BAZEL_CACHE=1 only works on Kokoro.
+# Without access to the credentials this won't work.
+if [[ ${USE_BAZEL_CACHE:-0} -ne 0 ]]; then
+ DOCKER_EXTRA_ARGS="--mount type=bind,source=${KOKORO_KEYSTORE_DIR},target=/keystore,readonly ${DOCKER_EXTRA_ARGS:-}"
+ # Bazel doesn't track changes to tools outside of the workspace
+ # (e.g. /usr/bin/gcc), so by appending the docker container to the
+ # remote_http_cache url, we make changes to the container part of
+ # the cache key. Hashing the key is to make it shorter and url-safe.
+ container_key=$(echo ${DOCKER_CONTAINER} | sha256sum | head -c 16)
+ BAZEL_EXTRA_ARGS="--remote_http_cache=https://storage.googleapis.com/absl-bazel-remote-cache/${container_key} --google_credentials=/keystore/73103_absl-bazel-remote-cache ${BAZEL_EXTRA_ARGS:-}"
+fi
+
+# Avoid depending on external sites like GitHub by checking --distdir for
+# external dependencies first.
+# https://docs.bazel.build/versions/master/guide.html#distdir
+if [[ ${KOKORO_GFILE_DIR:-} ]] && [[ -d "${KOKORO_GFILE_DIR}/distdir" ]]; then
+ DOCKER_EXTRA_ARGS="--mount type=bind,source=${KOKORO_GFILE_DIR}/distdir,target=/distdir,readonly ${DOCKER_EXTRA_ARGS:-}"
+ BAZEL_EXTRA_ARGS="--distdir=/distdir ${BAZEL_EXTRA_ARGS:-}"
+fi
+
+for std in ${STD}; do
+ for compilation_mode in ${COMPILATION_MODE}; do
+ for exceptions_mode in ${EXCEPTIONS_MODE}; do
+ echo "--------------------------------------------------------------------"
+ time docker run \
+ --mount type=bind,source="${ABSEIL_ROOT}",target=/abseil-cpp-ro,readonly \
+ --tmpfs=/abseil-cpp \
+ --workdir=/abseil-cpp \
+ --cap-add=SYS_PTRACE \
+ --rm \
+ -e CC="/opt/llvm/clang/bin/clang" \
+ -e BAZEL_CXXOPTS="-std=${std}:-nostdinc++" \
+ -e BAZEL_LINKOPTS="-L/opt/llvm/libcxx/lib:-lc++:-lc++abi:-lm:-Wl,-rpath=/opt/llvm/libcxx/lib" \
+ -e CPLUS_INCLUDE_PATH="/opt/llvm/libcxx/include/c++/v1" \
+ ${DOCKER_EXTRA_ARGS:-} \
+ ${DOCKER_CONTAINER} \
+ /bin/sh -c "
+ cp -r /abseil-cpp-ro/* /abseil-cpp/
+ if [ -n \"${ALTERNATE_OPTIONS:-}\" ]; then
+ cp ${ALTERNATE_OPTIONS:-} absl/base/options.h || exit 1
+ fi
+ /usr/local/bin/bazel test ... \
+ --compilation_mode=\"${compilation_mode}\" \
+ --copt=\"${exceptions_mode}\" \
+ --copt=-Werror \
+ --define=\"absl=1\" \
+ --keep_going \
+ --show_timestamps \
+ --test_env=\"GTEST_INSTALL_FAILURE_SIGNAL_HANDLER=1\" \
+ --test_env=\"TZDIR=/abseil-cpp/absl/time/internal/cctz/testdata/zoneinfo\" \
+ --test_output=errors \
+ --test_tag_filters=-benchmark \
+ ${BAZEL_EXTRA_ARGS:-}"
+ done
+ done
+done
diff --git a/third_party/abseil/src/ci/linux_clang-latest_libcxx_tsan_bazel.sh b/third_party/abseil/src/ci/linux_clang-latest_libcxx_tsan_bazel.sh
new file mode 100755
index 0000000..e70e821
--- /dev/null
+++ b/third_party/abseil/src/ci/linux_clang-latest_libcxx_tsan_bazel.sh
@@ -0,0 +1,95 @@
+#!/bin/bash
+#
+# Copyright 2019 The Abseil Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# This script that can be invoked to test abseil-cpp in a hermetic environment
+# using a Docker image on Linux. You must have Docker installed to use this
+# script.
+
+set -euox pipefail
+
+if [[ -z ${ABSEIL_ROOT:-} ]]; then
+ ABSEIL_ROOT="$(realpath $(dirname ${0})/..)"
+fi
+
+if [[ -z ${STD:-} ]]; then
+ STD="c++11 c++14 c++17 c++20"
+fi
+
+if [[ -z ${COMPILATION_MODE:-} ]]; then
+ COMPILATION_MODE="fastbuild opt"
+fi
+
+if [[ -z ${EXCEPTIONS_MODE:-} ]]; then
+ EXCEPTIONS_MODE="-fno-exceptions -fexceptions"
+fi
+
+source "${ABSEIL_ROOT}/ci/linux_docker_containers.sh"
+readonly DOCKER_CONTAINER=${LINUX_CLANG_LATEST_CONTAINER}
+
+# USE_BAZEL_CACHE=1 only works on Kokoro.
+# Without access to the credentials this won't work.
+if [[ ${USE_BAZEL_CACHE:-0} -ne 0 ]]; then
+ DOCKER_EXTRA_ARGS="--mount type=bind,source=${KOKORO_KEYSTORE_DIR},target=/keystore,readonly ${DOCKER_EXTRA_ARGS:-}"
+ # Bazel doesn't track changes to tools outside of the workspace
+ # (e.g. /usr/bin/gcc), so by appending the docker container to the
+ # remote_http_cache url, we make changes to the container part of
+ # the cache key. Hashing the key is to make it shorter and url-safe.
+ container_key=$(echo ${DOCKER_CONTAINER} | sha256sum | head -c 16)
+ BAZEL_EXTRA_ARGS="--remote_http_cache=https://storage.googleapis.com/absl-bazel-remote-cache/${container_key} --google_credentials=/keystore/73103_absl-bazel-remote-cache ${BAZEL_EXTRA_ARGS:-}"
+fi
+
+# Avoid depending on external sites like GitHub by checking --distdir for
+# external dependencies first.
+# https://docs.bazel.build/versions/master/guide.html#distdir
+if [[ ${KOKORO_GFILE_DIR:-} ]] && [[ -d "${KOKORO_GFILE_DIR}/distdir" ]]; then
+ DOCKER_EXTRA_ARGS="--mount type=bind,source=${KOKORO_GFILE_DIR}/distdir,target=/distdir,readonly ${DOCKER_EXTRA_ARGS:-}"
+ BAZEL_EXTRA_ARGS="--distdir=/distdir ${BAZEL_EXTRA_ARGS:-}"
+fi
+
+for std in ${STD}; do
+ for compilation_mode in ${COMPILATION_MODE}; do
+ for exceptions_mode in ${EXCEPTIONS_MODE}; do
+ echo "--------------------------------------------------------------------"
+ time docker run \
+ --mount type=bind,source="${ABSEIL_ROOT}",target=/abseil-cpp,readonly \
+ --workdir=/abseil-cpp \
+ --cap-add=SYS_PTRACE \
+ --rm \
+ -e CC="/opt/llvm/clang/bin/clang" \
+ -e BAZEL_CXXOPTS="-std=${std}:-nostdinc++" \
+ -e BAZEL_LINKOPTS="-L/opt/llvm/libcxx-tsan/lib:-lc++:-lc++abi:-lm:-Wl,-rpath=/opt/llvm/libcxx-tsan/lib" \
+ -e CPLUS_INCLUDE_PATH="/opt/llvm/libcxx-tsan/include/c++/v1" \
+ ${DOCKER_EXTRA_ARGS:-} \
+ ${DOCKER_CONTAINER} \
+ /usr/local/bin/bazel test ... \
+ --build_tag_filters="-notsan" \
+ --compilation_mode="${compilation_mode}" \
+ --copt="${exceptions_mode}" \
+ --copt="-fsanitize=thread" \
+ --copt="-fno-sanitize-blacklist" \
+ --copt=-Werror \
+ --keep_going \
+ --linkopt="-fsanitize=thread" \
+ --show_timestamps \
+ --test_env="TSAN_OPTIONS=report_atomic_races=0" \
+ --test_env="TSAN_SYMBOLIZER_PATH=/opt/llvm/clang/bin/llvm-symbolizer" \
+ --test_env="TZDIR=/abseil-cpp/absl/time/internal/cctz/testdata/zoneinfo" \
+ --test_output=errors \
+ --test_tag_filters="-benchmark,-notsan" \
+ ${BAZEL_EXTRA_ARGS:-}
+ done
+ done
+done
diff --git a/third_party/abseil/src/ci/linux_clang-latest_libstdcxx_bazel.sh b/third_party/abseil/src/ci/linux_clang-latest_libstdcxx_bazel.sh
new file mode 100755
index 0000000..0986ff4
--- /dev/null
+++ b/third_party/abseil/src/ci/linux_clang-latest_libstdcxx_bazel.sh
@@ -0,0 +1,91 @@
+#!/bin/bash
+#
+# Copyright 2019 The Abseil Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# This script that can be invoked to test abseil-cpp in a hermetic environment
+# using a Docker image on Linux. You must have Docker installed to use this
+# script.
+
+set -euox pipefail
+
+if [[ -z ${ABSEIL_ROOT:-} ]]; then
+ ABSEIL_ROOT="$(realpath $(dirname ${0})/..)"
+fi
+
+if [[ -z ${STD:-} ]]; then
+ STD="c++11 c++14 c++17 c++20"
+fi
+
+if [[ -z ${COMPILATION_MODE:-} ]]; then
+ COMPILATION_MODE="fastbuild opt"
+fi
+
+if [[ -z ${EXCEPTIONS_MODE:-} ]]; then
+ EXCEPTIONS_MODE="-fno-exceptions -fexceptions"
+fi
+
+source "${ABSEIL_ROOT}/ci/linux_docker_containers.sh"
+readonly DOCKER_CONTAINER=${LINUX_CLANG_LATEST_CONTAINER}
+
+# USE_BAZEL_CACHE=1 only works on Kokoro.
+# Without access to the credentials this won't work.
+if [[ ${USE_BAZEL_CACHE:-0} -ne 0 ]]; then
+ DOCKER_EXTRA_ARGS="--mount type=bind,source=${KOKORO_KEYSTORE_DIR},target=/keystore,readonly ${DOCKER_EXTRA_ARGS:-}"
+ # Bazel doesn't track changes to tools outside of the workspace
+ # (e.g. /usr/bin/gcc), so by appending the docker container to the
+ # remote_http_cache url, we make changes to the container part of
+ # the cache key. Hashing the key is to make it shorter and url-safe.
+ container_key=$(echo ${DOCKER_CONTAINER} | sha256sum | head -c 16)
+ BAZEL_EXTRA_ARGS="--remote_http_cache=https://storage.googleapis.com/absl-bazel-remote-cache/${container_key} --google_credentials=/keystore/73103_absl-bazel-remote-cache ${BAZEL_EXTRA_ARGS:-}"
+fi
+
+# Avoid depending on external sites like GitHub by checking --distdir for
+# external dependencies first.
+# https://docs.bazel.build/versions/master/guide.html#distdir
+if [[ ${KOKORO_GFILE_DIR:-} ]] && [[ -d "${KOKORO_GFILE_DIR}/distdir" ]]; then
+ DOCKER_EXTRA_ARGS="--mount type=bind,source=${KOKORO_GFILE_DIR}/distdir,target=/distdir,readonly ${DOCKER_EXTRA_ARGS:-}"
+ BAZEL_EXTRA_ARGS="--distdir=/distdir ${BAZEL_EXTRA_ARGS:-}"
+fi
+
+for std in ${STD}; do
+ for compilation_mode in ${COMPILATION_MODE}; do
+ for exceptions_mode in ${EXCEPTIONS_MODE}; do
+ echo "--------------------------------------------------------------------"
+ time docker run \
+ --mount type=bind,source="${ABSEIL_ROOT}",target=/abseil-cpp,readonly \
+ --workdir=/abseil-cpp \
+ --cap-add=SYS_PTRACE \
+ --rm \
+ -e CC="/opt/llvm/clang/bin/clang" \
+ -e BAZEL_CXXOPTS="-std=${std}" \
+ ${DOCKER_EXTRA_ARGS:-} \
+ ${DOCKER_CONTAINER} \
+ /usr/local/bin/bazel test ... \
+ --compilation_mode="${compilation_mode}" \
+ --copt="--gcc-toolchain=/usr/local" \
+ --copt="${exceptions_mode}" \
+ --copt=-Werror \
+ --define="absl=1" \
+ --keep_going \
+ --linkopt="--gcc-toolchain=/usr/local" \
+ --show_timestamps \
+ --test_env="GTEST_INSTALL_FAILURE_SIGNAL_HANDLER=1" \
+ --test_env="TZDIR=/abseil-cpp/absl/time/internal/cctz/testdata/zoneinfo" \
+ --test_output=errors \
+ --test_tag_filters=-benchmark \
+ ${BAZEL_EXTRA_ARGS:-}
+ done
+ done
+done
diff --git a/third_party/abseil/src/ci/linux_docker_containers.sh b/third_party/abseil/src/ci/linux_docker_containers.sh
new file mode 100644
index 0000000..1c29d9a
--- /dev/null
+++ b/third_party/abseil/src/ci/linux_docker_containers.sh
@@ -0,0 +1,21 @@
+# Copyright 2019 The Abseil Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# The file contains Docker container identifiers currently used by test scripts.
+# Test scripts should source this file to get the identifiers.
+
+readonly LINUX_ALPINE_CONTAINER="gcr.io/google.com/absl-177019/alpine:20201026"
+readonly LINUX_CLANG_LATEST_CONTAINER="gcr.io/google.com/absl-177019/linux_hybrid-latest:20201008"
+readonly LINUX_GCC_LATEST_CONTAINER="gcr.io/google.com/absl-177019/linux_hybrid-latest:20201008"
+readonly LINUX_GCC_FLOOR_CONTAINER="gcr.io/google.com/absl-177019/linux_gcc-floor:20201015"
diff --git a/third_party/abseil/src/ci/linux_gcc-floor_libstdcxx_bazel.sh b/third_party/abseil/src/ci/linux_gcc-floor_libstdcxx_bazel.sh
new file mode 100755
index 0000000..224aef8
--- /dev/null
+++ b/third_party/abseil/src/ci/linux_gcc-floor_libstdcxx_bazel.sh
@@ -0,0 +1,89 @@
+#!/bin/bash
+#
+# Copyright 2020 The Abseil Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# This script that can be invoked to test abseil-cpp in a hermetic environment
+# using a Docker image on Linux. You must have Docker installed to use this
+# script.
+
+set -euox pipefail
+
+if [[ -z ${ABSEIL_ROOT:-} ]]; then
+ ABSEIL_ROOT="$(realpath $(dirname ${0})/..)"
+fi
+
+if [[ -z ${STD:-} ]]; then
+ STD="c++11 c++14"
+fi
+
+if [[ -z ${COMPILATION_MODE:-} ]]; then
+ COMPILATION_MODE="fastbuild opt"
+fi
+
+if [[ -z ${EXCEPTIONS_MODE:-} ]]; then
+ EXCEPTIONS_MODE="-fno-exceptions -fexceptions"
+fi
+
+source "${ABSEIL_ROOT}/ci/linux_docker_containers.sh"
+readonly DOCKER_CONTAINER=${LINUX_GCC_FLOOR_CONTAINER}
+
+# USE_BAZEL_CACHE=1 only works on Kokoro.
+# Without access to the credentials this won't work.
+if [[ ${USE_BAZEL_CACHE:-0} -ne 0 ]]; then
+ DOCKER_EXTRA_ARGS="--volume=${KOKORO_KEYSTORE_DIR}:/keystore:ro ${DOCKER_EXTRA_ARGS:-}"
+ # Bazel doesn't track changes to tools outside of the workspace
+ # (e.g. /usr/bin/gcc), so by appending the docker container to the
+ # remote_http_cache url, we make changes to the container part of
+ # the cache key. Hashing the key is to make it shorter and url-safe.
+ container_key=$(echo ${DOCKER_CONTAINER} | sha256sum | head -c 16)
+ BAZEL_EXTRA_ARGS="--remote_http_cache=https://storage.googleapis.com/absl-bazel-remote-cache/${container_key} --google_credentials=/keystore/73103_absl-bazel-remote-cache ${BAZEL_EXTRA_ARGS:-}"
+fi
+
+# Avoid depending on external sites like GitHub by checking --distdir for
+# external dependencies first.
+# https://docs.bazel.build/versions/master/guide.html#distdir
+if [[ ${KOKORO_GFILE_DIR:-} ]] && [[ -d "${KOKORO_GFILE_DIR}/distdir" ]]; then
+ DOCKER_EXTRA_ARGS="--volume=${KOKORO_GFILE_DIR}/distdir:/distdir:ro ${DOCKER_EXTRA_ARGS:-}"
+ BAZEL_EXTRA_ARGS="--distdir=/distdir ${BAZEL_EXTRA_ARGS:-}"
+fi
+
+for std in ${STD}; do
+ for compilation_mode in ${COMPILATION_MODE}; do
+ for exceptions_mode in ${EXCEPTIONS_MODE}; do
+ echo "--------------------------------------------------------------------"
+ time docker run \
+ --volume="${ABSEIL_ROOT}:/abseil-cpp:ro" \
+ --workdir=/abseil-cpp \
+ --cap-add=SYS_PTRACE \
+ --rm \
+ -e CC="/usr/local/bin/gcc" \
+ -e BAZEL_CXXOPTS="-std=${std}" \
+ ${DOCKER_EXTRA_ARGS:-} \
+ ${DOCKER_CONTAINER} \
+ /usr/local/bin/bazel test ... \
+ --compilation_mode="${compilation_mode}" \
+ --copt="${exceptions_mode}" \
+ --copt=-Werror \
+ --define="absl=1" \
+ --keep_going \
+ --show_timestamps \
+ --test_env="GTEST_INSTALL_FAILURE_SIGNAL_HANDLER=1" \
+ --test_env="TZDIR=/abseil-cpp/absl/time/internal/cctz/testdata/zoneinfo" \
+ --test_output=errors \
+ --test_tag_filters=-benchmark \
+ ${BAZEL_EXTRA_ARGS:-}
+ done
+ done
+done
diff --git a/third_party/abseil/src/ci/linux_gcc-latest_libstdcxx_bazel.sh b/third_party/abseil/src/ci/linux_gcc-latest_libstdcxx_bazel.sh
new file mode 100755
index 0000000..37d89d9
--- /dev/null
+++ b/third_party/abseil/src/ci/linux_gcc-latest_libstdcxx_bazel.sh
@@ -0,0 +1,95 @@
+#!/bin/bash
+#
+# Copyright 2019 The Abseil Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# This script that can be invoked to test abseil-cpp in a hermetic environment
+# using a Docker image on Linux. You must have Docker installed to use this
+# script.
+
+set -euox pipefail
+
+if [[ -z ${ABSEIL_ROOT:-} ]]; then
+ ABSEIL_ROOT="$(realpath $(dirname ${0})/..)"
+fi
+
+if [[ -z ${STD:-} ]]; then
+ STD="c++11 c++14 c++17 c++20"
+fi
+
+if [[ -z ${COMPILATION_MODE:-} ]]; then
+ COMPILATION_MODE="fastbuild opt"
+fi
+
+if [[ -z ${EXCEPTIONS_MODE:-} ]]; then
+ EXCEPTIONS_MODE="-fno-exceptions -fexceptions"
+fi
+
+source "${ABSEIL_ROOT}/ci/linux_docker_containers.sh"
+readonly DOCKER_CONTAINER=${LINUX_GCC_LATEST_CONTAINER}
+
+# USE_BAZEL_CACHE=1 only works on Kokoro.
+# Without access to the credentials this won't work.
+if [[ ${USE_BAZEL_CACHE:-0} -ne 0 ]]; then
+ DOCKER_EXTRA_ARGS="--mount type=bind,source=${KOKORO_KEYSTORE_DIR},target=/keystore,readonly ${DOCKER_EXTRA_ARGS:-}"
+ # Bazel doesn't track changes to tools outside of the workspace
+ # (e.g. /usr/bin/gcc), so by appending the docker container to the
+ # remote_http_cache url, we make changes to the container part of
+ # the cache key. Hashing the key is to make it shorter and url-safe.
+ container_key=$(echo ${DOCKER_CONTAINER} | sha256sum | head -c 16)
+ BAZEL_EXTRA_ARGS="--remote_http_cache=https://storage.googleapis.com/absl-bazel-remote-cache/${container_key} --google_credentials=/keystore/73103_absl-bazel-remote-cache ${BAZEL_EXTRA_ARGS:-}"
+fi
+
+# Avoid depending on external sites like GitHub by checking --distdir for
+# external dependencies first.
+# https://docs.bazel.build/versions/master/guide.html#distdir
+if [[ ${KOKORO_GFILE_DIR:-} ]] && [[ -d "${KOKORO_GFILE_DIR}/distdir" ]]; then
+ DOCKER_EXTRA_ARGS="--mount type=bind,source=${KOKORO_GFILE_DIR}/distdir,target=/distdir,readonly ${DOCKER_EXTRA_ARGS:-}"
+ BAZEL_EXTRA_ARGS="--distdir=/distdir ${BAZEL_EXTRA_ARGS:-}"
+fi
+
+for std in ${STD}; do
+ for compilation_mode in ${COMPILATION_MODE}; do
+ for exceptions_mode in ${EXCEPTIONS_MODE}; do
+ echo "--------------------------------------------------------------------"
+ time docker run \
+ --mount type=bind,source="${ABSEIL_ROOT}",target=/abseil-cpp-ro,readonly \
+ --tmpfs=/abseil-cpp \
+ --workdir=/abseil-cpp \
+ --cap-add=SYS_PTRACE \
+ --rm \
+ -e CC="/usr/local/bin/gcc" \
+ -e BAZEL_CXXOPTS="-std=${std}" \
+ ${DOCKER_EXTRA_ARGS:-} \
+ ${DOCKER_CONTAINER} \
+ /bin/sh -c "
+ cp -r /abseil-cpp-ro/* /abseil-cpp/
+ if [ -n \"${ALTERNATE_OPTIONS:-}\" ]; then
+ cp ${ALTERNATE_OPTIONS:-} absl/base/options.h || exit 1
+ fi
+ /usr/local/bin/bazel test ... \
+ --compilation_mode=\"${compilation_mode}\" \
+ --copt=\"${exceptions_mode}\" \
+ --copt=-Werror \
+ --define=\"absl=1\" \
+ --keep_going \
+ --show_timestamps \
+ --test_env=\"GTEST_INSTALL_FAILURE_SIGNAL_HANDLER=1\" \
+ --test_env=\"TZDIR=/abseil-cpp/absl/time/internal/cctz/testdata/zoneinfo\" \
+ --test_output=errors \
+ --test_tag_filters=-benchmark \
+ ${BAZEL_EXTRA_ARGS:-}"
+ done
+ done
+done
diff --git a/third_party/abseil/src/ci/linux_gcc-latest_libstdcxx_cmake.sh b/third_party/abseil/src/ci/linux_gcc-latest_libstdcxx_cmake.sh
new file mode 100755
index 0000000..ed9cfa3
--- /dev/null
+++ b/third_party/abseil/src/ci/linux_gcc-latest_libstdcxx_cmake.sh
@@ -0,0 +1,65 @@
+#!/bin/bash
+#
+# Copyright 2019 The Abseil Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+set -euox pipefail
+
+if [[ -z ${ABSEIL_ROOT:-} ]]; then
+ ABSEIL_ROOT="$(realpath $(dirname ${0})/..)"
+fi
+
+source "${ABSEIL_ROOT}/ci/cmake_common.sh"
+
+if [[ -z ${ABSL_CMAKE_CXX_STANDARDS:-} ]]; then
+ ABSL_CMAKE_CXX_STANDARDS="11 14 17 20"
+fi
+
+if [[ -z ${ABSL_CMAKE_BUILD_TYPES:-} ]]; then
+ ABSL_CMAKE_BUILD_TYPES="Debug Release"
+fi
+
+if [[ -z ${ABSL_CMAKE_BUILD_SHARED:-} ]]; then
+ ABSL_CMAKE_BUILD_SHARED="OFF ON"
+fi
+
+source "${ABSEIL_ROOT}/ci/linux_docker_containers.sh"
+readonly DOCKER_CONTAINER=${LINUX_GCC_LATEST_CONTAINER}
+
+for std in ${ABSL_CMAKE_CXX_STANDARDS}; do
+ for compilation_mode in ${ABSL_CMAKE_BUILD_TYPES}; do
+ for build_shared in ${ABSL_CMAKE_BUILD_SHARED}; do
+ time docker run \
+ --mount type=bind,source="${ABSEIL_ROOT}",target=/abseil-cpp,readonly \
+ --tmpfs=/buildfs:exec \
+ --workdir=/buildfs \
+ --cap-add=SYS_PTRACE \
+ --rm \
+ -e CFLAGS="-Werror" \
+ -e CXXFLAGS="-Werror" \
+ ${DOCKER_EXTRA_ARGS:-} \
+ "${DOCKER_CONTAINER}" \
+ /bin/bash -c "
+ cmake /abseil-cpp \
+ -DABSL_GOOGLETEST_DOWNLOAD_URL=${ABSL_GOOGLETEST_DOWNLOAD_URL} \
+ -DABSL_RUN_TESTS=ON \
+ -DBUILD_SHARED_LIBS=${build_shared} \
+ -DCMAKE_BUILD_TYPE=${compilation_mode} \
+ -DCMAKE_CXX_STANDARD=${std} \
+ -DCMAKE_MODULE_LINKER_FLAGS=\"-Wl,--no-undefined\" && \
+ make -j$(nproc) && \
+ ctest -j$(nproc) --output-on-failure"
+ done
+ done
+done
diff --git a/third_party/abseil/src/ci/linux_gcc_alpine_cmake.sh b/third_party/abseil/src/ci/linux_gcc_alpine_cmake.sh
new file mode 100755
index 0000000..31310ac
--- /dev/null
+++ b/third_party/abseil/src/ci/linux_gcc_alpine_cmake.sh
@@ -0,0 +1,64 @@
+#!/bin/bash
+#
+# Copyright 2019 The Abseil Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+set -euox pipefail
+
+if [[ -z ${ABSEIL_ROOT:-} ]]; then
+ ABSEIL_ROOT="$(realpath $(dirname ${0})/..)"
+fi
+
+source "${ABSEIL_ROOT}/ci/cmake_common.sh"
+
+if [[ -z ${ABSL_CMAKE_CXX_STANDARDS:-} ]]; then
+ ABSL_CMAKE_CXX_STANDARDS="11 14 17"
+fi
+
+if [[ -z ${ABSL_CMAKE_BUILD_TYPES:-} ]]; then
+ ABSL_CMAKE_BUILD_TYPES="Debug Release"
+fi
+
+if [[ -z ${ABSL_CMAKE_BUILD_SHARED:-} ]]; then
+ ABSL_CMAKE_BUILD_SHARED="OFF ON"
+fi
+
+source "${ABSEIL_ROOT}/ci/linux_docker_containers.sh"
+readonly DOCKER_CONTAINER=${LINUX_ALPINE_CONTAINER}
+
+for std in ${ABSL_CMAKE_CXX_STANDARDS}; do
+ for compilation_mode in ${ABSL_CMAKE_BUILD_TYPES}; do
+ for build_shared in ${ABSL_CMAKE_BUILD_SHARED}; do
+ time docker run \
+ --mount type=bind,source="${ABSEIL_ROOT}",target=/abseil-cpp,readonly \
+ --tmpfs=/buildfs:exec \
+ --workdir=/buildfs \
+ --cap-add=SYS_PTRACE \
+ --rm \
+ -e CFLAGS="-Werror" \
+ -e CXXFLAGS="-Werror" \
+ ${DOCKER_EXTRA_ARGS:-} \
+ "${DOCKER_CONTAINER}" \
+ /bin/sh -c "
+ cmake /abseil-cpp \
+ -DABSL_GOOGLETEST_DOWNLOAD_URL=${ABSL_GOOGLETEST_DOWNLOAD_URL} \
+ -DABSL_RUN_TESTS=ON \
+ -DCMAKE_BUILD_TYPE=${compilation_mode} \
+ -DCMAKE_CXX_STANDARD=${std} \
+ -DCMAKE_MODULE_LINKER_FLAGS=\"-Wl,--no-undefined\" && \
+ make -j$(nproc) && \
+ ctest -j$(nproc) --output-on-failure"
+ done
+ done
+done
diff --git a/third_party/abseil/src/ci/macos_xcode_bazel.sh b/third_party/abseil/src/ci/macos_xcode_bazel.sh
new file mode 100755
index 0000000..738adf9
--- /dev/null
+++ b/third_party/abseil/src/ci/macos_xcode_bazel.sh
@@ -0,0 +1,54 @@
+#!/bin/bash
+#
+# Copyright 2019 The Abseil Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# This script is invoked on Kokoro to test Abseil on macOS.
+# It is not hermetic and may break when Kokoro is updated.
+
+set -euox pipefail
+
+if [[ -z ${ABSEIL_ROOT:-} ]]; then
+ ABSEIL_ROOT="$(realpath $(dirname ${0})/..)"
+fi
+
+# If we are running on Kokoro, check for a versioned Bazel binary.
+KOKORO_GFILE_BAZEL_BIN="bazel-2.0.0-darwin-x86_64"
+if [[ ${KOKORO_GFILE_DIR:-} ]] && [[ -f ${KOKORO_GFILE_DIR}/${KOKORO_GFILE_BAZEL_BIN} ]]; then
+ BAZEL_BIN="${KOKORO_GFILE_DIR}/${KOKORO_GFILE_BAZEL_BIN}"
+ chmod +x ${BAZEL_BIN}
+else
+ BAZEL_BIN="bazel"
+fi
+
+# Print the compiler and Bazel versions.
+echo "---------------"
+gcc -v
+echo "---------------"
+${BAZEL_BIN} version
+echo "---------------"
+
+cd ${ABSEIL_ROOT}
+
+if [[ -n "${ALTERNATE_OPTIONS:-}" ]]; then
+ cp ${ALTERNATE_OPTIONS:-} absl/base/options.h || exit 1
+fi
+
+${BAZEL_BIN} test ... \
+ --copt=-Werror \
+ --keep_going \
+ --show_timestamps \
+ --test_env="TZDIR=${ABSEIL_ROOT}/absl/time/internal/cctz/testdata/zoneinfo" \
+ --test_output=errors \
+ --test_tag_filters=-benchmark
diff --git a/third_party/abseil/src/ci/macos_xcode_cmake.sh b/third_party/abseil/src/ci/macos_xcode_cmake.sh
new file mode 100755
index 0000000..0847b3e
--- /dev/null
+++ b/third_party/abseil/src/ci/macos_xcode_cmake.sh
@@ -0,0 +1,56 @@
+#!/bin/bash
+#
+# Copyright 2019 The Abseil Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+set -euox pipefail
+
+if [[ -z ${ABSEIL_ROOT:-} ]]; then
+ ABSEIL_ROOT="$(dirname ${0})/.."
+fi
+ABSEIL_ROOT=$(realpath ${ABSEIL_ROOT})
+
+source "${ABSEIL_ROOT}/ci/cmake_common.sh"
+
+# The MacOS build doesn't run in a docker container, so we have to override ABSL_GOOGLETEST_DOWNLOAD_URL.
+if [[ -r "${KOKORO_GFILE_DIR}/distdir/${ABSL_GOOGLETEST_COMMIT}.zip" ]]; then
+ ABSL_GOOGLETEST_DOWNLOAD_URL="file://${KOKORO_GFILE_DIR}/distdir/${ABSL_GOOGLETEST_COMMIT}.zip"
+fi
+
+if [[ -z ${ABSL_CMAKE_BUILD_TYPES:-} ]]; then
+ ABSL_CMAKE_BUILD_TYPES="Debug"
+fi
+
+if [[ -z ${ABSL_CMAKE_BUILD_SHARED:-} ]]; then
+ ABSL_CMAKE_BUILD_SHARED="OFF ON"
+fi
+
+for compilation_mode in ${ABSL_CMAKE_BUILD_TYPES}; do
+ for build_shared in ${ABSL_CMAKE_BUILD_SHARED}; do
+ BUILD_DIR=$(mktemp -d ${compilation_mode}.XXXXXXXX)
+ cd ${BUILD_DIR}
+
+ # TODO(absl-team): Enable -Werror once all warnings are fixed.
+ time cmake ${ABSEIL_ROOT} \
+ -GXcode \
+ -DBUILD_SHARED_LIBS=${build_shared} \
+ -DCMAKE_BUILD_TYPE=${compilation_mode} \
+ -DCMAKE_CXX_STANDARD=11 \
+ -DCMAKE_MODULE_LINKER_FLAGS="-Wl,--no-undefined" \
+ -DABSL_GOOGLETEST_DOWNLOAD_URL="${ABSL_GOOGLETEST_DOWNLOAD_URL}" \
+ -DABSL_RUN_TESTS=ON
+ time cmake --build .
+ time ctest -C ${compilation_mode} --output-on-failure
+ done
+done
diff --git a/third_party/abseil/src/conanfile.py b/third_party/abseil/src/conanfile.py
new file mode 100755
index 0000000..926ec5c
--- /dev/null
+++ b/third_party/abseil/src/conanfile.py
@@ -0,0 +1,51 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+# Note: Conan is supported on a best-effort basis. Abseil doesn't use Conan
+# internally, so we won't know if it stops working. We may ask community
+# members to help us debug any problems that arise.
+
+from conans import ConanFile, CMake, tools
+from conans.errors import ConanInvalidConfiguration
+from conans.model.version import Version
+
+
+class AbseilConan(ConanFile):
+ name = "abseil"
+ url = "https://github.com/abseil/abseil-cpp"
+ homepage = url
+ author = "Abseil <abseil-io@googlegroups.com>"
+ description = "Abseil Common Libraries (C++) from Google"
+ license = "Apache-2.0"
+ topics = ("conan", "abseil", "abseil-cpp", "google", "common-libraries")
+ exports = ["LICENSE"]
+ exports_sources = ["CMakeLists.txt", "CMake/*", "absl/*"]
+ generators = "cmake"
+ settings = "os", "arch", "compiler", "build_type"
+
+ def configure(self):
+ if self.settings.os == "Windows" and \
+ self.settings.compiler == "Visual Studio" and \
+ Version(self.settings.compiler.version.value) < "14":
+ raise ConanInvalidConfiguration("Abseil does not support MSVC < 14")
+
+ def build(self):
+ tools.replace_in_file("CMakeLists.txt", "project(absl CXX)", "project(absl CXX)\ninclude(conanbuildinfo.cmake)\nconan_basic_setup()")
+ cmake = CMake(self)
+ cmake.definitions["BUILD_TESTING"] = False
+ cmake.configure()
+ cmake.build()
+
+ def package(self):
+ self.copy("LICENSE", dst="licenses")
+ self.copy("*.h", dst="include", src=".")
+ self.copy("*.inc", dst="include", src=".")
+ self.copy("*.a", dst="lib", src=".", keep_path=False)
+ self.copy("*.lib", dst="lib", src=".", keep_path=False)
+
+ def package_info(self):
+ if self.settings.os == "Linux":
+ self.cpp_info.libs = ["-Wl,--start-group"]
+ self.cpp_info.libs.extend(tools.collect_libs(self))
+ if self.settings.os == "Linux":
+ self.cpp_info.libs.extend(["-Wl,--end-group", "pthread"])
